drivers/scsi/scsi_transport_iscsi.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * iSCSI transport class definitions
   4  *
   5  * Copyright (C) IBM Corporation, 2004
   6  * Copyright (C) Mike Christie, 2004 - 2005
   7  * Copyright (C) Dmitry Yusupov, 2004 - 2005
   8  * Copyright (C) Alex Aizman, 2004 - 2005
   9  */
  10 #include <linux/module.h>
  11 #include <linux/mutex.h>
  12 #include <linux/slab.h>
  13 #include <linux/bsg-lib.h>
  14 #include <linux/idr.h>
  15 #include <net/tcp.h>
  16 #include <scsi/scsi.h>
  17 #include <scsi/scsi_host.h>
  18 #include <scsi/scsi_device.h>
  19 #include <scsi/scsi_transport.h>
  20 #include <scsi/scsi_transport_iscsi.h>
  21 #include <scsi/iscsi_if.h>
  22 #include <scsi/scsi_cmnd.h>
  23 #include <scsi/scsi_bsg_iscsi.h>
  24
  25 #define ISCSI_TRANSPORT_VERSION "2.0-870"
  26
  27 #define ISCSI_SEND_MAX_ALLOWED  10
  28
  29 #define CREATE_TRACE_POINTS
  30 #include <trace/events/iscsi.h>
  31
  32 /*
  33  * Export tracepoint symbols to be used by other modules.
  34  */
  35 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_conn);
  36 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_eh);
  37 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_session);
  38 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_tcp);
  39 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_sw_tcp);
  40
  41 static int dbg_session;
  42 module_param_named(debug_session, dbg_session, int,
  43                    S_IRUGO | S_IWUSR);
  44 MODULE_PARM_DESC(debug_session,
  45                  "Turn on debugging for sessions in scsi_transport_iscsi "
  46                  "module. Set to 1 to turn on, and zero to turn off. Default "
  47                  "is off.");
  48
  49 static int dbg_conn;
  50 module_param_named(debug_conn, dbg_conn, int,
  51                    S_IRUGO | S_IWUSR);
  52 MODULE_PARM_DESC(debug_conn,
  53                  "Turn on debugging for connections in scsi_transport_iscsi "
  54                  "module. Set to 1 to turn on, and zero to turn off. Default "
  55                  "is off.");
  56
  57 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...)              \
  58         do {                                                            \
  59                 if (dbg_session)                                        \
  60                         iscsi_cls_session_printk(KERN_INFO, _session,   \
  61                                                  "%s: " dbg_fmt,        \
  62                                                  __func__, ##arg);      \
  63                 iscsi_dbg_trace(trace_iscsi_dbg_trans_session,          \
  64                                 &(_session)->dev,                       \
  65                                 "%s " dbg_fmt, __func__, ##arg);        \
  66         } while (0);
  67
  68 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...)                    \
  69         do {                                                            \
  70                 if (dbg_conn)                                           \
  71                         iscsi_cls_conn_printk(KERN_INFO, _conn,         \
  72                                               "%s: " dbg_fmt,           \
  73                                               __func__, ##arg);         \
  74                 iscsi_dbg_trace(trace_iscsi_dbg_trans_conn,             \
  75                                 &(_conn)->dev,                          \
  76                                 "%s " dbg_fmt, __func__, ##arg);        \
  77         } while (0);
  78
  79 struct iscsi_internal {
  80         struct scsi_transport_template t;
  81         struct iscsi_transport *iscsi_transport;
  82         struct list_head list;
  83         struct device dev;
  84
  85         struct transport_container conn_cont;
  86         struct transport_container session_cont;
  87 };
  88
  89 static DEFINE_IDR(iscsi_ep_idr);
  90 static DEFINE_MUTEX(iscsi_ep_idr_mutex);
  91
  92 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
  93
  94 static struct workqueue_struct *iscsi_conn_cleanup_workq;
  95
  96 static DEFINE_IDA(iscsi_sess_ida);
  97 /*
  98  * list of registered transports and lock that must
  99  * be held while accessing list. The iscsi_transport_lock must
 100  * be acquired after the rx_queue_mutex.
 101  */
 102 static LIST_HEAD(iscsi_transports);
 103 static DEFINE_SPINLOCK(iscsi_transport_lock);
 104
 105 #define to_iscsi_internal(tmpl) \
 106         container_of(tmpl, struct iscsi_internal, t)
 107
 108 #define dev_to_iscsi_internal(_dev) \
 109         container_of(_dev, struct iscsi_internal, dev)
 110
 111 static void iscsi_transport_release(struct device *dev)
 112 {
 113         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 114         kfree(priv);
 115 }
 116
 117 /*
 118  * iscsi_transport_class represents the iscsi_transports that are
 119  * registered.
 120  */
 121 static struct class iscsi_transport_class = {
 122         .name = "iscsi_transport",
 123         .dev_release = iscsi_transport_release,
 124 };
 125
 126 static ssize_t
 127 show_transport_handle(struct device *dev, struct device_attribute *attr,
 128                       char *buf)
 129 {
 130         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 131
 132         if (!capable(CAP_SYS_ADMIN))
 133                 return -EACCES;
 134         return sysfs_emit(buf, "%llu\n",
 135                   (unsigned long long)iscsi_handle(priv->iscsi_transport));
 136 }
 137 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
 138
 139 #define show_transport_attr(name, format)                               \
 140 static ssize_t                                                          \
 141 show_transport_##name(struct device *dev,                               \
 142                       struct device_attribute *attr,char *buf)          \
 143 {                                                                       \
 144         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);       \
 145         return sysfs_emit(buf, format"\n", priv->iscsi_transport->name);\
 146 }                                                                       \
 147 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
 148
 149 show_transport_attr(caps, "0x%x");
 150
 151 static struct attribute *iscsi_transport_attrs[] = {
 152         &dev_attr_handle.attr,
 153         &dev_attr_caps.attr,
 154         NULL,
 155 };
 156
 157 static struct attribute_group iscsi_transport_group = {
 158         .attrs = iscsi_transport_attrs,
 159 };
 160
 161 /*
 162  * iSCSI endpoint attrs
 163  */
 164 #define iscsi_dev_to_endpoint(_dev) \
 165         container_of(_dev, struct iscsi_endpoint, dev)
 166
 167 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store)    \
 168 struct device_attribute dev_attr_##_prefix##_##_name =  \
 169         __ATTR(_name,_mode,_show,_store)
 170
 171 static void iscsi_endpoint_release(struct device *dev)
 172 {
 173         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 174
 175         mutex_lock(&iscsi_ep_idr_mutex);
 176         idr_remove(&iscsi_ep_idr, ep->id);
 177         mutex_unlock(&iscsi_ep_idr_mutex);
 178
 179         kfree(ep);
 180 }
 181
 182 static struct class iscsi_endpoint_class = {
 183         .name = "iscsi_endpoint",
 184         .dev_release = iscsi_endpoint_release,
 185 };
 186
 187 static ssize_t
 188 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
 189 {
 190         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 191         return sysfs_emit(buf, "%d\n", ep->id);
 192 }
 193 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
 194
 195 static struct attribute *iscsi_endpoint_attrs[] = {
 196         &dev_attr_ep_handle.attr,
 197         NULL,
 198 };
 199
 200 static struct attribute_group iscsi_endpoint_group = {
 201         .attrs = iscsi_endpoint_attrs,
 202 };
 203
 204 struct iscsi_endpoint *
 205 iscsi_create_endpoint(int dd_size)
 206 {
 207         struct iscsi_endpoint *ep;
 208         int err, id;
 209
 210         ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
 211         if (!ep)
 212                 return NULL;
 213
 214         mutex_lock(&iscsi_ep_idr_mutex);
 215
 216         /*
 217          * First endpoint id should be 1 to comply with user space
 218          * applications (iscsid).
 219          */
 220         id = idr_alloc(&iscsi_ep_idr, ep, 1, -1, GFP_NOIO);
 221         if (id < 0) {
 222                 mutex_unlock(&iscsi_ep_idr_mutex);
 223                 printk(KERN_ERR "Could not allocate endpoint ID. Error %d.\n",
 224                        id);
 225                 goto free_ep;
 226         }
 227         mutex_unlock(&iscsi_ep_idr_mutex);
 228
 229         ep->id = id;
 230         ep->dev.class = &iscsi_endpoint_class;
 231         dev_set_name(&ep->dev, "ep-%d", id);
 232         err = device_register(&ep->dev);
 233         if (err)
 234                 goto put_dev;
 235
 236         err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
 237         if (err)
 238                 goto unregister_dev;
 239
 240         if (dd_size)
 241                 ep->dd_data = &ep[1];
 242         return ep;
 243
 244 unregister_dev:
 245         device_unregister(&ep->dev);
 246         return NULL;
 247
 248 put_dev:
 249         mutex_lock(&iscsi_ep_idr_mutex);
 250         idr_remove(&iscsi_ep_idr, id);
 251         mutex_unlock(&iscsi_ep_idr_mutex);
 252         put_device(&ep->dev);
 253         return NULL;
 254 free_ep:
 255         kfree(ep);
 256         return NULL;
 257 }
 258 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
 259
 260 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
 261 {
 262         sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
 263         device_unregister(&ep->dev);
 264 }
 265 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
 266
 267 void iscsi_put_endpoint(struct iscsi_endpoint *ep)
 268 {
 269         put_device(&ep->dev);
 270 }
 271 EXPORT_SYMBOL_GPL(iscsi_put_endpoint);
 272
 273 /**
 274  * iscsi_lookup_endpoint - get ep from handle
 275  * @handle: endpoint handle
 276  *
 277  * Caller must do a iscsi_put_endpoint.
 278  */
 279 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
 280 {
 281         struct iscsi_endpoint *ep;
 282
 283         mutex_lock(&iscsi_ep_idr_mutex);
 284         ep = idr_find(&iscsi_ep_idr, handle);
 285         if (!ep)
 286                 goto unlock;
 287
 288         get_device(&ep->dev);
 289 unlock:
 290         mutex_unlock(&iscsi_ep_idr_mutex);
 291         return ep;
 292 }
 293 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
 294
 295 /*
 296  * Interface to display network param to sysfs
 297  */
 298
 299 static void iscsi_iface_release(struct device *dev)
 300 {
 301         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 302         struct device *parent = iface->dev.parent;
 303
 304         kfree(iface);
 305         put_device(parent);
 306 }
 307
 308
 309 static struct class iscsi_iface_class = {
 310         .name = "iscsi_iface",
 311         .dev_release = iscsi_iface_release,
 312 };
 313
 314 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store)  \
 315 struct device_attribute dev_attr_##_prefix##_##_name =          \
 316         __ATTR(_name, _mode, _show, _store)
 317
 318 /* iface attrs show */
 319 #define iscsi_iface_attr_show(type, name, param_type, param)            \
 320 static ssize_t                                                          \
 321 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 322                      char *buf)                                         \
 323 {                                                                       \
 324         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);            \
 325         struct iscsi_transport *t = iface->transport;                   \
 326         return t->get_iface_param(iface, param_type, param, buf);       \
 327 }                                                                       \
 328
 329 #define iscsi_iface_net_attr(type, name, param)                         \
 330         iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param)       \
 331 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 332
 333 #define iscsi_iface_attr(type, name, param)                             \
 334         iscsi_iface_attr_show(type, name, ISCSI_IFACE_PARAM, param)     \
 335 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 336
 337 /* generic read only ipv4 attribute */
 338 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
 339 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
 340 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
 341 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
 342 iscsi_iface_net_attr(ipv4_iface, dhcp_dns_address_en,
 343                      ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN);
 344 iscsi_iface_net_attr(ipv4_iface, dhcp_slp_da_info_en,
 345                      ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN);
 346 iscsi_iface_net_attr(ipv4_iface, tos_en, ISCSI_NET_PARAM_IPV4_TOS_EN);
 347 iscsi_iface_net_attr(ipv4_iface, tos, ISCSI_NET_PARAM_IPV4_TOS);
 348 iscsi_iface_net_attr(ipv4_iface, grat_arp_en,
 349                      ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN);
 350 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id_en,
 351                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN);
 352 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id,
 353                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID);
 354 iscsi_iface_net_attr(ipv4_iface, dhcp_req_vendor_id_en,
 355                      ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN);
 356 iscsi_iface_net_attr(ipv4_iface, dhcp_use_vendor_id_en,
 357                      ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN);
 358 iscsi_iface_net_attr(ipv4_iface, dhcp_vendor_id,
 359                      ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID);
 360 iscsi_iface_net_attr(ipv4_iface, dhcp_learn_iqn_en,
 361                      ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN);
 362 iscsi_iface_net_attr(ipv4_iface, fragment_disable,
 363                      ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE);
 364 iscsi_iface_net_attr(ipv4_iface, incoming_forwarding_en,
 365                      ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN);
 366 iscsi_iface_net_attr(ipv4_iface, ttl, ISCSI_NET_PARAM_IPV4_TTL);
 367
 368 /* generic read only ipv6 attribute */
 369 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
 370 iscsi_iface_net_attr(ipv6_iface, link_local_addr,
 371                      ISCSI_NET_PARAM_IPV6_LINKLOCAL);
 372 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
 373 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
 374                      ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
 375 iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
 376                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
 377 iscsi_iface_net_attr(ipv6_iface, link_local_state,
 378                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE);
 379 iscsi_iface_net_attr(ipv6_iface, router_state,
 380                      ISCSI_NET_PARAM_IPV6_ROUTER_STATE);
 381 iscsi_iface_net_attr(ipv6_iface, grat_neighbor_adv_en,
 382                      ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN);
 383 iscsi_iface_net_attr(ipv6_iface, mld_en, ISCSI_NET_PARAM_IPV6_MLD_EN);
 384 iscsi_iface_net_attr(ipv6_iface, flow_label, ISCSI_NET_PARAM_IPV6_FLOW_LABEL);
 385 iscsi_iface_net_attr(ipv6_iface, traffic_class,
 386                      ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS);
 387 iscsi_iface_net_attr(ipv6_iface, hop_limit, ISCSI_NET_PARAM_IPV6_HOP_LIMIT);
 388 iscsi_iface_net_attr(ipv6_iface, nd_reachable_tmo,
 389                      ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO);
 390 iscsi_iface_net_attr(ipv6_iface, nd_rexmit_time,
 391                      ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME);
 392 iscsi_iface_net_attr(ipv6_iface, nd_stale_tmo,
 393                      ISCSI_NET_PARAM_IPV6_ND_STALE_TMO);
 394 iscsi_iface_net_attr(ipv6_iface, dup_addr_detect_cnt,
 395                      ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT);
 396 iscsi_iface_net_attr(ipv6_iface, router_adv_link_mtu,
 397                      ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU);
 398
 399 /* common read only iface attribute */
 400 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
 401 iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
 402 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
 403 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
 404 iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
 405 iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
 406 iscsi_iface_net_attr(iface, ipaddress_state, ISCSI_NET_PARAM_IPADDR_STATE);
 407 iscsi_iface_net_attr(iface, delayed_ack_en, ISCSI_NET_PARAM_DELAYED_ACK_EN);
 408 iscsi_iface_net_attr(iface, tcp_nagle_disable,
 409                      ISCSI_NET_PARAM_TCP_NAGLE_DISABLE);
 410 iscsi_iface_net_attr(iface, tcp_wsf_disable, ISCSI_NET_PARAM_TCP_WSF_DISABLE);
 411 iscsi_iface_net_attr(iface, tcp_wsf, ISCSI_NET_PARAM_TCP_WSF);
 412 iscsi_iface_net_attr(iface, tcp_timer_scale, ISCSI_NET_PARAM_TCP_TIMER_SCALE);
 413 iscsi_iface_net_attr(iface, tcp_timestamp_en, ISCSI_NET_PARAM_TCP_TIMESTAMP_EN);
 414 iscsi_iface_net_attr(iface, cache_id, ISCSI_NET_PARAM_CACHE_ID);
 415 iscsi_iface_net_attr(iface, redirect_en, ISCSI_NET_PARAM_REDIRECT_EN);
 416
 417 /* common iscsi specific settings attributes */
 418 iscsi_iface_attr(iface, def_taskmgmt_tmo, ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO);
 419 iscsi_iface_attr(iface, header_digest, ISCSI_IFACE_PARAM_HDRDGST_EN);
 420 iscsi_iface_attr(iface, data_digest, ISCSI_IFACE_PARAM_DATADGST_EN);
 421 iscsi_iface_attr(iface, immediate_data, ISCSI_IFACE_PARAM_IMM_DATA_EN);
 422 iscsi_iface_attr(iface, initial_r2t, ISCSI_IFACE_PARAM_INITIAL_R2T_EN);
 423 iscsi_iface_attr(iface, data_seq_in_order,
 424                  ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN);
 425 iscsi_iface_attr(iface, data_pdu_in_order, ISCSI_IFACE_PARAM_PDU_INORDER_EN);
 426 iscsi_iface_attr(iface, erl, ISCSI_IFACE_PARAM_ERL);
 427 iscsi_iface_attr(iface, max_recv_dlength, ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH);
 428 iscsi_iface_attr(iface, first_burst_len, ISCSI_IFACE_PARAM_FIRST_BURST);
 429 iscsi_iface_attr(iface, max_outstanding_r2t, ISCSI_IFACE_PARAM_MAX_R2T);
 430 iscsi_iface_attr(iface, max_burst_len, ISCSI_IFACE_PARAM_MAX_BURST);
 431 iscsi_iface_attr(iface, chap_auth, ISCSI_IFACE_PARAM_CHAP_AUTH_EN);
 432 iscsi_iface_attr(iface, bidi_chap, ISCSI_IFACE_PARAM_BIDI_CHAP_EN);
 433 iscsi_iface_attr(iface, discovery_auth_optional,
 434                  ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL);
 435 iscsi_iface_attr(iface, discovery_logout,
 436                  ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN);
 437 iscsi_iface_attr(iface, strict_login_comp_en,
 438                  ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN);
 439 iscsi_iface_attr(iface, initiator_name, ISCSI_IFACE_PARAM_INITIATOR_NAME);
 440
 441 static umode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
 442                                           struct attribute *attr, int i)
 443 {
 444         struct device *dev = container_of(kobj, struct device, kobj);
 445         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 446         struct iscsi_transport *t = iface->transport;
 447         int param = -1;
 448
 449         if (attr == &dev_attr_iface_def_taskmgmt_tmo.attr)
 450                 param = ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO;
 451         else if (attr == &dev_attr_iface_header_digest.attr)
 452                 param = ISCSI_IFACE_PARAM_HDRDGST_EN;
 453         else if (attr == &dev_attr_iface_data_digest.attr)
 454                 param = ISCSI_IFACE_PARAM_DATADGST_EN;
 455         else if (attr == &dev_attr_iface_immediate_data.attr)
 456                 param = ISCSI_IFACE_PARAM_IMM_DATA_EN;
 457         else if (attr == &dev_attr_iface_initial_r2t.attr)
 458                 param = ISCSI_IFACE_PARAM_INITIAL_R2T_EN;
 459         else if (attr == &dev_attr_iface_data_seq_in_order.attr)
 460                 param = ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN;
 461         else if (attr == &dev_attr_iface_data_pdu_in_order.attr)
 462                 param = ISCSI_IFACE_PARAM_PDU_INORDER_EN;
 463         else if (attr == &dev_attr_iface_erl.attr)
 464                 param = ISCSI_IFACE_PARAM_ERL;
 465         else if (attr == &dev_attr_iface_max_recv_dlength.attr)
 466                 param = ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH;
 467         else if (attr == &dev_attr_iface_first_burst_len.attr)
 468                 param = ISCSI_IFACE_PARAM_FIRST_BURST;
 469         else if (attr == &dev_attr_iface_max_outstanding_r2t.attr)
 470                 param = ISCSI_IFACE_PARAM_MAX_R2T;
 471         else if (attr == &dev_attr_iface_max_burst_len.attr)
 472                 param = ISCSI_IFACE_PARAM_MAX_BURST;
 473         else if (attr == &dev_attr_iface_chap_auth.attr)
 474                 param = ISCSI_IFACE_PARAM_CHAP_AUTH_EN;
 475         else if (attr == &dev_attr_iface_bidi_chap.attr)
 476                 param = ISCSI_IFACE_PARAM_BIDI_CHAP_EN;
 477         else if (attr == &dev_attr_iface_discovery_auth_optional.attr)
 478                 param = ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL;
 479         else if (attr == &dev_attr_iface_discovery_logout.attr)
 480                 param = ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN;
 481         else if (attr == &dev_attr_iface_strict_login_comp_en.attr)
 482                 param = ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN;
 483         else if (attr == &dev_attr_iface_initiator_name.attr)
 484                 param = ISCSI_IFACE_PARAM_INITIATOR_NAME;
 485
 486         if (param != -1)
 487                 return t->attr_is_visible(ISCSI_IFACE_PARAM, param);
 488
 489         if (attr == &dev_attr_iface_enabled.attr)
 490                 param = ISCSI_NET_PARAM_IFACE_ENABLE;
 491         else if (attr == &dev_attr_iface_vlan_id.attr)
 492                 param = ISCSI_NET_PARAM_VLAN_ID;
 493         else if (attr == &dev_attr_iface_vlan_priority.attr)
 494                 param = ISCSI_NET_PARAM_VLAN_PRIORITY;
 495         else if (attr == &dev_attr_iface_vlan_enabled.attr)
 496                 param = ISCSI_NET_PARAM_VLAN_ENABLED;
 497         else if (attr == &dev_attr_iface_mtu.attr)
 498                 param = ISCSI_NET_PARAM_MTU;
 499         else if (attr == &dev_attr_iface_port.attr)
 500                 param = ISCSI_NET_PARAM_PORT;
 501         else if (attr == &dev_attr_iface_ipaddress_state.attr)
 502                 param = ISCSI_NET_PARAM_IPADDR_STATE;
 503         else if (attr == &dev_attr_iface_delayed_ack_en.attr)
 504                 param = ISCSI_NET_PARAM_DELAYED_ACK_EN;
 505         else if (attr == &dev_attr_iface_tcp_nagle_disable.attr)
 506                 param = ISCSI_NET_PARAM_TCP_NAGLE_DISABLE;
 507         else if (attr == &dev_attr_iface_tcp_wsf_disable.attr)
 508                 param = ISCSI_NET_PARAM_TCP_WSF_DISABLE;
 509         else if (attr == &dev_attr_iface_tcp_wsf.attr)
 510                 param = ISCSI_NET_PARAM_TCP_WSF;
 511         else if (attr == &dev_attr_iface_tcp_timer_scale.attr)
 512                 param = ISCSI_NET_PARAM_TCP_TIMER_SCALE;
 513         else if (attr == &dev_attr_iface_tcp_timestamp_en.attr)
 514                 param = ISCSI_NET_PARAM_TCP_TIMESTAMP_EN;
 515         else if (attr == &dev_attr_iface_cache_id.attr)
 516                 param = ISCSI_NET_PARAM_CACHE_ID;
 517         else if (attr == &dev_attr_iface_redirect_en.attr)
 518                 param = ISCSI_NET_PARAM_REDIRECT_EN;
 519         else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
 520                 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
 521                         param = ISCSI_NET_PARAM_IPV4_ADDR;
 522                 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
 523                         param = ISCSI_NET_PARAM_IPV4_GW;
 524                 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
 525                         param = ISCSI_NET_PARAM_IPV4_SUBNET;
 526                 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
 527                         param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
 528                 else if (attr ==
 529                          &dev_attr_ipv4_iface_dhcp_dns_address_en.attr)
 530                         param = ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN;
 531                 else if (attr ==
 532                          &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr)
 533                         param = ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN;
 534                 else if (attr == &dev_attr_ipv4_iface_tos_en.attr)
 535                         param = ISCSI_NET_PARAM_IPV4_TOS_EN;
 536                 else if (attr == &dev_attr_ipv4_iface_tos.attr)
 537                         param = ISCSI_NET_PARAM_IPV4_TOS;
 538                 else if (attr == &dev_attr_ipv4_iface_grat_arp_en.attr)
 539                         param = ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN;
 540                 else if (attr ==
 541                          &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr)
 542                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN;
 543                 else if (attr == &dev_attr_ipv4_iface_dhcp_alt_client_id.attr)
 544                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID;
 545                 else if (attr ==
 546                          &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr)
 547                         param = ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN;
 548                 else if (attr ==
 549                          &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr)
 550                         param = ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN;
 551                 else if (attr == &dev_attr_ipv4_iface_dhcp_vendor_id.attr)
 552                         param = ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID;
 553                 else if (attr ==
 554                          &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr)
 555                         param = ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN;
 556                 else if (attr ==
 557                          &dev_attr_ipv4_iface_fragment_disable.attr)
 558                         param = ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE;
 559                 else if (attr ==
 560                          &dev_attr_ipv4_iface_incoming_forwarding_en.attr)
 561                         param = ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN;
 562                 else if (attr == &dev_attr_ipv4_iface_ttl.attr)
 563                         param = ISCSI_NET_PARAM_IPV4_TTL;
 564                 else
 565                         return 0;
 566         } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
 567                 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
 568                         param = ISCSI_NET_PARAM_IPV6_ADDR;
 569                 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
 570                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
 571                 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
 572                         param = ISCSI_NET_PARAM_IPV6_ROUTER;
 573                 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
 574                         param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
 575                 else if (attr == &dev_attr_ipv6_iface_link_local_autocfg.attr)
 576                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
 577                 else if (attr == &dev_attr_ipv6_iface_link_local_state.attr)
 578                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE;
 579                 else if (attr == &dev_attr_ipv6_iface_router_state.attr)
 580                         param = ISCSI_NET_PARAM_IPV6_ROUTER_STATE;
 581                 else if (attr ==
 582                          &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr)
 583                         param = ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN;
 584                 else if (attr == &dev_attr_ipv6_iface_mld_en.attr)
 585                         param = ISCSI_NET_PARAM_IPV6_MLD_EN;
 586                 else if (attr == &dev_attr_ipv6_iface_flow_label.attr)
 587                         param = ISCSI_NET_PARAM_IPV6_FLOW_LABEL;
 588                 else if (attr == &dev_attr_ipv6_iface_traffic_class.attr)
 589                         param = ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS;
 590                 else if (attr == &dev_attr_ipv6_iface_hop_limit.attr)
 591                         param = ISCSI_NET_PARAM_IPV6_HOP_LIMIT;
 592                 else if (attr == &dev_attr_ipv6_iface_nd_reachable_tmo.attr)
 593                         param = ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO;
 594                 else if (attr == &dev_attr_ipv6_iface_nd_rexmit_time.attr)
 595                         param = ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME;
 596                 else if (attr == &dev_attr_ipv6_iface_nd_stale_tmo.attr)
 597                         param = ISCSI_NET_PARAM_IPV6_ND_STALE_TMO;
 598                 else if (attr == &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr)
 599                         param = ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT;
 600                 else if (attr == &dev_attr_ipv6_iface_router_adv_link_mtu.attr)
 601                         param = ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU;
 602                 else
 603                         return 0;
 604         } else {
 605                 WARN_ONCE(1, "Invalid iface attr");
 606                 return 0;
 607         }
 608
 609         return t->attr_is_visible(ISCSI_NET_PARAM, param);
 610 }
 611
 612 static struct attribute *iscsi_iface_attrs[] = {
 613         &dev_attr_iface_enabled.attr,
 614         &dev_attr_iface_vlan_id.attr,
 615         &dev_attr_iface_vlan_priority.attr,
 616         &dev_attr_iface_vlan_enabled.attr,
 617         &dev_attr_ipv4_iface_ipaddress.attr,
 618         &dev_attr_ipv4_iface_gateway.attr,
 619         &dev_attr_ipv4_iface_subnet.attr,
 620         &dev_attr_ipv4_iface_bootproto.attr,
 621         &dev_attr_ipv6_iface_ipaddress.attr,
 622         &dev_attr_ipv6_iface_link_local_addr.attr,
 623         &dev_attr_ipv6_iface_router_addr.attr,
 624         &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
 625         &dev_attr_ipv6_iface_link_local_autocfg.attr,
 626         &dev_attr_iface_mtu.attr,
 627         &dev_attr_iface_port.attr,
 628         &dev_attr_iface_ipaddress_state.attr,
 629         &dev_attr_iface_delayed_ack_en.attr,
 630         &dev_attr_iface_tcp_nagle_disable.attr,
 631         &dev_attr_iface_tcp_wsf_disable.attr,
 632         &dev_attr_iface_tcp_wsf.attr,
 633         &dev_attr_iface_tcp_timer_scale.attr,
 634         &dev_attr_iface_tcp_timestamp_en.attr,
 635         &dev_attr_iface_cache_id.attr,
 636         &dev_attr_iface_redirect_en.attr,
 637         &dev_attr_iface_def_taskmgmt_tmo.attr,
 638         &dev_attr_iface_header_digest.attr,
 639         &dev_attr_iface_data_digest.attr,
 640         &dev_attr_iface_immediate_data.attr,
 641         &dev_attr_iface_initial_r2t.attr,
 642         &dev_attr_iface_data_seq_in_order.attr,
 643         &dev_attr_iface_data_pdu_in_order.attr,
 644         &dev_attr_iface_erl.attr,
 645         &dev_attr_iface_max_recv_dlength.attr,
 646         &dev_attr_iface_first_burst_len.attr,
 647         &dev_attr_iface_max_outstanding_r2t.attr,
 648         &dev_attr_iface_max_burst_len.attr,
 649         &dev_attr_iface_chap_auth.attr,
 650         &dev_attr_iface_bidi_chap.attr,
 651         &dev_attr_iface_discovery_auth_optional.attr,
 652         &dev_attr_iface_discovery_logout.attr,
 653         &dev_attr_iface_strict_login_comp_en.attr,
 654         &dev_attr_iface_initiator_name.attr,
 655         &dev_attr_ipv4_iface_dhcp_dns_address_en.attr,
 656         &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr,
 657         &dev_attr_ipv4_iface_tos_en.attr,
 658         &dev_attr_ipv4_iface_tos.attr,
 659         &dev_attr_ipv4_iface_grat_arp_en.attr,
 660         &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr,
 661         &dev_attr_ipv4_iface_dhcp_alt_client_id.attr,
 662         &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr,
 663         &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr,
 664         &dev_attr_ipv4_iface_dhcp_vendor_id.attr,
 665         &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr,
 666         &dev_attr_ipv4_iface_fragment_disable.attr,
 667         &dev_attr_ipv4_iface_incoming_forwarding_en.attr,
 668         &dev_attr_ipv4_iface_ttl.attr,
 669         &dev_attr_ipv6_iface_link_local_state.attr,
 670         &dev_attr_ipv6_iface_router_state.attr,
 671         &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr,
 672         &dev_attr_ipv6_iface_mld_en.attr,
 673         &dev_attr_ipv6_iface_flow_label.attr,
 674         &dev_attr_ipv6_iface_traffic_class.attr,
 675         &dev_attr_ipv6_iface_hop_limit.attr,
 676         &dev_attr_ipv6_iface_nd_reachable_tmo.attr,
 677         &dev_attr_ipv6_iface_nd_rexmit_time.attr,
 678         &dev_attr_ipv6_iface_nd_stale_tmo.attr,
 679         &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr,
 680         &dev_attr_ipv6_iface_router_adv_link_mtu.attr,
 681         NULL,
 682 };
 683
 684 static struct attribute_group iscsi_iface_group = {
 685         .attrs = iscsi_iface_attrs,
 686         .is_visible = iscsi_iface_attr_is_visible,
 687 };
 688
 689 /* convert iscsi_ipaddress_state values to ascii string name */
 690 static const struct {
 691         enum iscsi_ipaddress_state      value;
 692         char                            *name;
 693 } iscsi_ipaddress_state_names[] = {
 694         {ISCSI_IPDDRESS_STATE_UNCONFIGURED,     "Unconfigured" },
 695         {ISCSI_IPDDRESS_STATE_ACQUIRING,        "Acquiring" },
 696         {ISCSI_IPDDRESS_STATE_TENTATIVE,        "Tentative" },
 697         {ISCSI_IPDDRESS_STATE_VALID,            "Valid" },
 698         {ISCSI_IPDDRESS_STATE_DISABLING,        "Disabling" },
 699         {ISCSI_IPDDRESS_STATE_INVALID,          "Invalid" },
 700         {ISCSI_IPDDRESS_STATE_DEPRECATED,       "Deprecated" },
 701 };
 702
 703 char *iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state)
 704 {
 705         int i;
 706         char *state = NULL;
 707
 708         for (i = 0; i < ARRAY_SIZE(iscsi_ipaddress_state_names); i++) {
 709                 if (iscsi_ipaddress_state_names[i].value == port_state) {
 710                         state = iscsi_ipaddress_state_names[i].name;
 711                         break;
 712                 }
 713         }
 714         return state;
 715 }
 716 EXPORT_SYMBOL_GPL(iscsi_get_ipaddress_state_name);
 717
 718 /* convert iscsi_router_state values to ascii string name */
 719 static const struct {
 720         enum iscsi_router_state value;
 721         char                    *name;
 722 } iscsi_router_state_names[] = {
 723         {ISCSI_ROUTER_STATE_UNKNOWN,            "Unknown" },
 724         {ISCSI_ROUTER_STATE_ADVERTISED,         "Advertised" },
 725         {ISCSI_ROUTER_STATE_MANUAL,             "Manual" },
 726         {ISCSI_ROUTER_STATE_STALE,              "Stale" },
 727 };
 728
 729 char *iscsi_get_router_state_name(enum iscsi_router_state router_state)
 730 {
 731         int i;
 732         char *state = NULL;
 733
 734         for (i = 0; i < ARRAY_SIZE(iscsi_router_state_names); i++) {
 735                 if (iscsi_router_state_names[i].value == router_state) {
 736                         state = iscsi_router_state_names[i].name;
 737                         break;
 738                 }
 739         }
 740         return state;
 741 }
 742 EXPORT_SYMBOL_GPL(iscsi_get_router_state_name);
 743
 744 struct iscsi_iface *
 745 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
 746                    uint32_t iface_type, uint32_t iface_num, int dd_size)
 747 {
 748         struct iscsi_iface *iface;
 749         int err;
 750
 751         iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
 752         if (!iface)
 753                 return NULL;
 754
 755         iface->transport = transport;
 756         iface->iface_type = iface_type;
 757         iface->iface_num = iface_num;
 758         iface->dev.release = iscsi_iface_release;
 759         iface->dev.class = &iscsi_iface_class;
 760         /* parent reference released in iscsi_iface_release */
 761         iface->dev.parent = get_device(&shost->shost_gendev);
 762         if (iface_type == ISCSI_IFACE_TYPE_IPV4)
 763                 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
 764                              iface_num);
 765         else
 766                 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
 767                              iface_num);
 768
 769         err = device_register(&iface->dev);
 770         if (err)
 771                 goto put_dev;
 772
 773         err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
 774         if (err)
 775                 goto unreg_iface;
 776
 777         if (dd_size)
 778                 iface->dd_data = &iface[1];
 779         return iface;
 780
 781 unreg_iface:
 782         device_unregister(&iface->dev);
 783         return NULL;
 784
 785 put_dev:
 786         put_device(&iface->dev);
 787         return NULL;
 788 }
 789 EXPORT_SYMBOL_GPL(iscsi_create_iface);
 790
 791 void iscsi_destroy_iface(struct iscsi_iface *iface)
 792 {
 793         sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
 794         device_unregister(&iface->dev);
 795 }
 796 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
 797
 798 /*
 799  * Interface to display flash node params to sysfs
 800  */
 801
 802 #define ISCSI_FLASHNODE_ATTR(_prefix, _name, _mode, _show, _store)      \
 803 struct device_attribute dev_attr_##_prefix##_##_name =                  \
 804         __ATTR(_name, _mode, _show, _store)
 805
 806 /* flash node session attrs show */
 807 #define iscsi_flashnode_sess_attr_show(type, name, param)               \
 808 static ssize_t                                                          \
 809 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 810                      char *buf)                                         \
 811 {                                                                       \
 812         struct iscsi_bus_flash_session *fnode_sess =                    \
 813                                         iscsi_dev_to_flash_session(dev);\
 814         struct iscsi_transport *t = fnode_sess->transport;              \
 815         return t->get_flashnode_param(fnode_sess, param, buf);          \
 816 }                                                                       \
 817
 818
 819 #define iscsi_flashnode_sess_attr(type, name, param)                    \
 820         iscsi_flashnode_sess_attr_show(type, name, param)               \
 821 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
 822                             show_##type##_##name, NULL);
 823
 824 /* Flash node session attributes */
 825
 826 iscsi_flashnode_sess_attr(fnode, auto_snd_tgt_disable,
 827                           ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE);
 828 iscsi_flashnode_sess_attr(fnode, discovery_session,
 829                           ISCSI_FLASHNODE_DISCOVERY_SESS);
 830 iscsi_flashnode_sess_attr(fnode, portal_type, ISCSI_FLASHNODE_PORTAL_TYPE);
 831 iscsi_flashnode_sess_attr(fnode, entry_enable, ISCSI_FLASHNODE_ENTRY_EN);
 832 iscsi_flashnode_sess_attr(fnode, immediate_data, ISCSI_FLASHNODE_IMM_DATA_EN);
 833 iscsi_flashnode_sess_attr(fnode, initial_r2t, ISCSI_FLASHNODE_INITIAL_R2T_EN);
 834 iscsi_flashnode_sess_attr(fnode, data_seq_in_order,
 835                           ISCSI_FLASHNODE_DATASEQ_INORDER);
 836 iscsi_flashnode_sess_attr(fnode, data_pdu_in_order,
 837                           ISCSI_FLASHNODE_PDU_INORDER);
 838 iscsi_flashnode_sess_attr(fnode, chap_auth, ISCSI_FLASHNODE_CHAP_AUTH_EN);
 839 iscsi_flashnode_sess_attr(fnode, discovery_logout,
 840                           ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN);
 841 iscsi_flashnode_sess_attr(fnode, bidi_chap, ISCSI_FLASHNODE_BIDI_CHAP_EN);
 842 iscsi_flashnode_sess_attr(fnode, discovery_auth_optional,
 843                           ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL);
 844 iscsi_flashnode_sess_attr(fnode, erl, ISCSI_FLASHNODE_ERL);
 845 iscsi_flashnode_sess_attr(fnode, first_burst_len, ISCSI_FLASHNODE_FIRST_BURST);
 846 iscsi_flashnode_sess_attr(fnode, def_time2wait, ISCSI_FLASHNODE_DEF_TIME2WAIT);
 847 iscsi_flashnode_sess_attr(fnode, def_time2retain,
 848                           ISCSI_FLASHNODE_DEF_TIME2RETAIN);
 849 iscsi_flashnode_sess_attr(fnode, max_outstanding_r2t, ISCSI_FLASHNODE_MAX_R2T);
 850 iscsi_flashnode_sess_attr(fnode, isid, ISCSI_FLASHNODE_ISID);
 851 iscsi_flashnode_sess_attr(fnode, tsid, ISCSI_FLASHNODE_TSID);
 852 iscsi_flashnode_sess_attr(fnode, max_burst_len, ISCSI_FLASHNODE_MAX_BURST);
 853 iscsi_flashnode_sess_attr(fnode, def_taskmgmt_tmo,
 854                           ISCSI_FLASHNODE_DEF_TASKMGMT_TMO);
 855 iscsi_flashnode_sess_attr(fnode, targetalias, ISCSI_FLASHNODE_ALIAS);
 856 iscsi_flashnode_sess_attr(fnode, targetname, ISCSI_FLASHNODE_NAME);
 857 iscsi_flashnode_sess_attr(fnode, tpgt, ISCSI_FLASHNODE_TPGT);
 858 iscsi_flashnode_sess_attr(fnode, discovery_parent_idx,
 859                           ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX);
 860 iscsi_flashnode_sess_attr(fnode, discovery_parent_type,
 861                           ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE);
 862 iscsi_flashnode_sess_attr(fnode, chap_in_idx, ISCSI_FLASHNODE_CHAP_IN_IDX);
 863 iscsi_flashnode_sess_attr(fnode, chap_out_idx, ISCSI_FLASHNODE_CHAP_OUT_IDX);
 864 iscsi_flashnode_sess_attr(fnode, username, ISCSI_FLASHNODE_USERNAME);
 865 iscsi_flashnode_sess_attr(fnode, username_in, ISCSI_FLASHNODE_USERNAME_IN);
 866 iscsi_flashnode_sess_attr(fnode, password, ISCSI_FLASHNODE_PASSWORD);
 867 iscsi_flashnode_sess_attr(fnode, password_in, ISCSI_FLASHNODE_PASSWORD_IN);
 868 iscsi_flashnode_sess_attr(fnode, is_boot_target, ISCSI_FLASHNODE_IS_BOOT_TGT);
 869
 870 static struct attribute *iscsi_flashnode_sess_attrs[] = {
 871         &dev_attr_fnode_auto_snd_tgt_disable.attr,
 872         &dev_attr_fnode_discovery_session.attr,
 873         &dev_attr_fnode_portal_type.attr,
 874         &dev_attr_fnode_entry_enable.attr,
 875         &dev_attr_fnode_immediate_data.attr,
 876         &dev_attr_fnode_initial_r2t.attr,
 877         &dev_attr_fnode_data_seq_in_order.attr,
 878         &dev_attr_fnode_data_pdu_in_order.attr,
 879         &dev_attr_fnode_chap_auth.attr,
 880         &dev_attr_fnode_discovery_logout.attr,
 881         &dev_attr_fnode_bidi_chap.attr,
 882         &dev_attr_fnode_discovery_auth_optional.attr,
 883         &dev_attr_fnode_erl.attr,
 884         &dev_attr_fnode_first_burst_len.attr,
 885         &dev_attr_fnode_def_time2wait.attr,
 886         &dev_attr_fnode_def_time2retain.attr,
 887         &dev_attr_fnode_max_outstanding_r2t.attr,
 888         &dev_attr_fnode_isid.attr,
 889         &dev_attr_fnode_tsid.attr,
 890         &dev_attr_fnode_max_burst_len.attr,
 891         &dev_attr_fnode_def_taskmgmt_tmo.attr,
 892         &dev_attr_fnode_targetalias.attr,
 893         &dev_attr_fnode_targetname.attr,
 894         &dev_attr_fnode_tpgt.attr,
 895         &dev_attr_fnode_discovery_parent_idx.attr,
 896         &dev_attr_fnode_discovery_parent_type.attr,
 897         &dev_attr_fnode_chap_in_idx.attr,
 898         &dev_attr_fnode_chap_out_idx.attr,
 899         &dev_attr_fnode_username.attr,
 900         &dev_attr_fnode_username_in.attr,
 901         &dev_attr_fnode_password.attr,
 902         &dev_attr_fnode_password_in.attr,
 903         &dev_attr_fnode_is_boot_target.attr,
 904         NULL,
 905 };
 906
 907 static umode_t iscsi_flashnode_sess_attr_is_visible(struct kobject *kobj,
 908                                                     struct attribute *attr,
 909                                                     int i)
 910 {
 911         struct device *dev = container_of(kobj, struct device, kobj);
 912         struct iscsi_bus_flash_session *fnode_sess =
 913                                                 iscsi_dev_to_flash_session(dev);
 914         struct iscsi_transport *t = fnode_sess->transport;
 915         int param;
 916
 917         if (attr == &dev_attr_fnode_auto_snd_tgt_disable.attr) {
 918                 param = ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE;
 919         } else if (attr == &dev_attr_fnode_discovery_session.attr) {
 920                 param = ISCSI_FLASHNODE_DISCOVERY_SESS;
 921         } else if (attr == &dev_attr_fnode_portal_type.attr) {
 922                 param = ISCSI_FLASHNODE_PORTAL_TYPE;
 923         } else if (attr == &dev_attr_fnode_entry_enable.attr) {
 924                 param = ISCSI_FLASHNODE_ENTRY_EN;
 925         } else if (attr == &dev_attr_fnode_immediate_data.attr) {
 926                 param = ISCSI_FLASHNODE_IMM_DATA_EN;
 927         } else if (attr == &dev_attr_fnode_initial_r2t.attr) {
 928                 param = ISCSI_FLASHNODE_INITIAL_R2T_EN;
 929         } else if (attr == &dev_attr_fnode_data_seq_in_order.attr) {
 930                 param = ISCSI_FLASHNODE_DATASEQ_INORDER;
 931         } else if (attr == &dev_attr_fnode_data_pdu_in_order.attr) {
 932                 param = ISCSI_FLASHNODE_PDU_INORDER;
 933         } else if (attr == &dev_attr_fnode_chap_auth.attr) {
 934                 param = ISCSI_FLASHNODE_CHAP_AUTH_EN;
 935         } else if (attr == &dev_attr_fnode_discovery_logout.attr) {
 936                 param = ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN;
 937         } else if (attr == &dev_attr_fnode_bidi_chap.attr) {
 938                 param = ISCSI_FLASHNODE_BIDI_CHAP_EN;
 939         } else if (attr == &dev_attr_fnode_discovery_auth_optional.attr) {
 940                 param = ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL;
 941         } else if (attr == &dev_attr_fnode_erl.attr) {
 942                 param = ISCSI_FLASHNODE_ERL;
 943         } else if (attr == &dev_attr_fnode_first_burst_len.attr) {
 944                 param = ISCSI_FLASHNODE_FIRST_BURST;
 945         } else if (attr == &dev_attr_fnode_def_time2wait.attr) {
 946                 param = ISCSI_FLASHNODE_DEF_TIME2WAIT;
 947         } else if (attr == &dev_attr_fnode_def_time2retain.attr) {
 948                 param = ISCSI_FLASHNODE_DEF_TIME2RETAIN;
 949         } else if (attr == &dev_attr_fnode_max_outstanding_r2t.attr) {
 950                 param = ISCSI_FLASHNODE_MAX_R2T;
 951         } else if (attr == &dev_attr_fnode_isid.attr) {
 952                 param = ISCSI_FLASHNODE_ISID;
 953         } else if (attr == &dev_attr_fnode_tsid.attr) {
 954                 param = ISCSI_FLASHNODE_TSID;
 955         } else if (attr == &dev_attr_fnode_max_burst_len.attr) {
 956                 param = ISCSI_FLASHNODE_MAX_BURST;
 957         } else if (attr == &dev_attr_fnode_def_taskmgmt_tmo.attr) {
 958                 param = ISCSI_FLASHNODE_DEF_TASKMGMT_TMO;
 959         } else if (attr == &dev_attr_fnode_targetalias.attr) {
 960                 param = ISCSI_FLASHNODE_ALIAS;
 961         } else if (attr == &dev_attr_fnode_targetname.attr) {
 962                 param = ISCSI_FLASHNODE_NAME;
 963         } else if (attr == &dev_attr_fnode_tpgt.attr) {
 964                 param = ISCSI_FLASHNODE_TPGT;
 965         } else if (attr == &dev_attr_fnode_discovery_parent_idx.attr) {
 966                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX;
 967         } else if (attr == &dev_attr_fnode_discovery_parent_type.attr) {
 968                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE;
 969         } else if (attr == &dev_attr_fnode_chap_in_idx.attr) {
 970                 param = ISCSI_FLASHNODE_CHAP_IN_IDX;
 971         } else if (attr == &dev_attr_fnode_chap_out_idx.attr) {
 972                 param = ISCSI_FLASHNODE_CHAP_OUT_IDX;
 973         } else if (attr == &dev_attr_fnode_username.attr) {
 974                 param = ISCSI_FLASHNODE_USERNAME;
 975         } else if (attr == &dev_attr_fnode_username_in.attr) {
 976                 param = ISCSI_FLASHNODE_USERNAME_IN;
 977         } else if (attr == &dev_attr_fnode_password.attr) {
 978                 param = ISCSI_FLASHNODE_PASSWORD;
 979         } else if (attr == &dev_attr_fnode_password_in.attr) {
 980                 param = ISCSI_FLASHNODE_PASSWORD_IN;
 981         } else if (attr == &dev_attr_fnode_is_boot_target.attr) {
 982                 param = ISCSI_FLASHNODE_IS_BOOT_TGT;
 983         } else {
 984                 WARN_ONCE(1, "Invalid flashnode session attr");
 985                 return 0;
 986         }
 987
 988         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
 989 }
 990
 991 static struct attribute_group iscsi_flashnode_sess_attr_group = {
 992         .attrs = iscsi_flashnode_sess_attrs,
 993         .is_visible = iscsi_flashnode_sess_attr_is_visible,
 994 };
 995
 996 static const struct attribute_group *iscsi_flashnode_sess_attr_groups[] = {
 997         &iscsi_flashnode_sess_attr_group,
 998         NULL,
 999 };
1000
1001 static void iscsi_flashnode_sess_release(struct device *dev)
1002 {
1003         struct iscsi_bus_flash_session *fnode_sess =
1004                                                 iscsi_dev_to_flash_session(dev);
1005
1006         kfree(fnode_sess->targetname);
1007         kfree(fnode_sess->targetalias);
1008         kfree(fnode_sess->portal_type);
1009         kfree(fnode_sess);
1010 }
1011
1012 static const struct device_type iscsi_flashnode_sess_dev_type = {
1013         .name = "iscsi_flashnode_sess_dev_type",
1014         .groups = iscsi_flashnode_sess_attr_groups,
1015         .release = iscsi_flashnode_sess_release,
1016 };
1017
1018 /* flash node connection attrs show */
1019 #define iscsi_flashnode_conn_attr_show(type, name, param)               \
1020 static ssize_t                                                          \
1021 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
1022                      char *buf)                                         \
1023 {                                                                       \
1024         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);\
1025         struct iscsi_bus_flash_session *fnode_sess =                    \
1026                                 iscsi_flash_conn_to_flash_session(fnode_conn);\
1027         struct iscsi_transport *t = fnode_conn->transport;              \
1028         return t->get_flashnode_param(fnode_sess, param, buf);          \
1029 }                                                                       \
1030
1031
1032 #define iscsi_flashnode_conn_attr(type, name, param)                    \
1033         iscsi_flashnode_conn_attr_show(type, name, param)               \
1034 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
1035                             show_##type##_##name, NULL);
1036
1037 /* Flash node connection attributes */
1038
1039 iscsi_flashnode_conn_attr(fnode, is_fw_assigned_ipv6,
1040                           ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6);
1041 iscsi_flashnode_conn_attr(fnode, header_digest, ISCSI_FLASHNODE_HDR_DGST_EN);
1042 iscsi_flashnode_conn_attr(fnode, data_digest, ISCSI_FLASHNODE_DATA_DGST_EN);
1043 iscsi_flashnode_conn_attr(fnode, snack_req, ISCSI_FLASHNODE_SNACK_REQ_EN);
1044 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_stat,
1045                           ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT);
1046 iscsi_flashnode_conn_attr(fnode, tcp_nagle_disable,
1047                           ISCSI_FLASHNODE_TCP_NAGLE_DISABLE);
1048 iscsi_flashnode_conn_attr(fnode, tcp_wsf_disable,
1049                           ISCSI_FLASHNODE_TCP_WSF_DISABLE);
1050 iscsi_flashnode_conn_attr(fnode, tcp_timer_scale,
1051                           ISCSI_FLASHNODE_TCP_TIMER_SCALE);
1052 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_enable,
1053                           ISCSI_FLASHNODE_TCP_TIMESTAMP_EN);
1054 iscsi_flashnode_conn_attr(fnode, fragment_disable,
1055                           ISCSI_FLASHNODE_IP_FRAG_DISABLE);
1056 iscsi_flashnode_conn_attr(fnode, keepalive_tmo, ISCSI_FLASHNODE_KEEPALIVE_TMO);
1057 iscsi_flashnode_conn_attr(fnode, port, ISCSI_FLASHNODE_PORT);
1058 iscsi_flashnode_conn_attr(fnode, ipaddress, ISCSI_FLASHNODE_IPADDR);
1059 iscsi_flashnode_conn_attr(fnode, max_recv_dlength,
1060                           ISCSI_FLASHNODE_MAX_RECV_DLENGTH);
1061 iscsi_flashnode_conn_attr(fnode, max_xmit_dlength,
1062                           ISCSI_FLASHNODE_MAX_XMIT_DLENGTH);
1063 iscsi_flashnode_conn_attr(fnode, local_port, ISCSI_FLASHNODE_LOCAL_PORT);
1064 iscsi_flashnode_conn_attr(fnode, ipv4_tos, ISCSI_FLASHNODE_IPV4_TOS);
1065 iscsi_flashnode_conn_attr(fnode, ipv6_traffic_class, ISCSI_FLASHNODE_IPV6_TC);
1066 iscsi_flashnode_conn_attr(fnode, ipv6_flow_label,
1067                           ISCSI_FLASHNODE_IPV6_FLOW_LABEL);
1068 iscsi_flashnode_conn_attr(fnode, redirect_ipaddr,
1069                           ISCSI_FLASHNODE_REDIRECT_IPADDR);
1070 iscsi_flashnode_conn_attr(fnode, max_segment_size,
1071                           ISCSI_FLASHNODE_MAX_SEGMENT_SIZE);
1072 iscsi_flashnode_conn_attr(fnode, link_local_ipv6,
1073                           ISCSI_FLASHNODE_LINK_LOCAL_IPV6);
1074 iscsi_flashnode_conn_attr(fnode, tcp_xmit_wsf, ISCSI_FLASHNODE_TCP_XMIT_WSF);
1075 iscsi_flashnode_conn_attr(fnode, tcp_recv_wsf, ISCSI_FLASHNODE_TCP_RECV_WSF);
1076 iscsi_flashnode_conn_attr(fnode, statsn, ISCSI_FLASHNODE_STATSN);
1077 iscsi_flashnode_conn_attr(fnode, exp_statsn, ISCSI_FLASHNODE_EXP_STATSN);
1078
1079 static struct attribute *iscsi_flashnode_conn_attrs[] = {
1080         &dev_attr_fnode_is_fw_assigned_ipv6.attr,
1081         &dev_attr_fnode_header_digest.attr,
1082         &dev_attr_fnode_data_digest.attr,
1083         &dev_attr_fnode_snack_req.attr,
1084         &dev_attr_fnode_tcp_timestamp_stat.attr,
1085         &dev_attr_fnode_tcp_nagle_disable.attr,
1086         &dev_attr_fnode_tcp_wsf_disable.attr,
1087         &dev_attr_fnode_tcp_timer_scale.attr,
1088         &dev_attr_fnode_tcp_timestamp_enable.attr,
1089         &dev_attr_fnode_fragment_disable.attr,
1090         &dev_attr_fnode_max_recv_dlength.attr,
1091         &dev_attr_fnode_max_xmit_dlength.attr,
1092         &dev_attr_fnode_keepalive_tmo.attr,
1093         &dev_attr_fnode_port.attr,
1094         &dev_attr_fnode_ipaddress.attr,
1095         &dev_attr_fnode_redirect_ipaddr.attr,
1096         &dev_attr_fnode_max_segment_size.attr,
1097         &dev_attr_fnode_local_port.attr,
1098         &dev_attr_fnode_ipv4_tos.attr,
1099         &dev_attr_fnode_ipv6_traffic_class.attr,
1100         &dev_attr_fnode_ipv6_flow_label.attr,
1101         &dev_attr_fnode_link_local_ipv6.attr,
1102         &dev_attr_fnode_tcp_xmit_wsf.attr,
1103         &dev_attr_fnode_tcp_recv_wsf.attr,
1104         &dev_attr_fnode_statsn.attr,
1105         &dev_attr_fnode_exp_statsn.attr,
1106         NULL,
1107 };
1108
1109 static umode_t iscsi_flashnode_conn_attr_is_visible(struct kobject *kobj,
1110                                                     struct attribute *attr,
1111                                                     int i)
1112 {
1113         struct device *dev = container_of(kobj, struct device, kobj);
1114         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1115         struct iscsi_transport *t = fnode_conn->transport;
1116         int param;
1117
1118         if (attr == &dev_attr_fnode_is_fw_assigned_ipv6.attr) {
1119                 param = ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6;
1120         } else if (attr == &dev_attr_fnode_header_digest.attr) {
1121                 param = ISCSI_FLASHNODE_HDR_DGST_EN;
1122         } else if (attr == &dev_attr_fnode_data_digest.attr) {
1123                 param = ISCSI_FLASHNODE_DATA_DGST_EN;
1124         } else if (attr == &dev_attr_fnode_snack_req.attr) {
1125                 param = ISCSI_FLASHNODE_SNACK_REQ_EN;
1126         } else if (attr == &dev_attr_fnode_tcp_timestamp_stat.attr) {
1127                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT;
1128         } else if (attr == &dev_attr_fnode_tcp_nagle_disable.attr) {
1129                 param = ISCSI_FLASHNODE_TCP_NAGLE_DISABLE;
1130         } else if (attr == &dev_attr_fnode_tcp_wsf_disable.attr) {
1131                 param = ISCSI_FLASHNODE_TCP_WSF_DISABLE;
1132         } else if (attr == &dev_attr_fnode_tcp_timer_scale.attr) {
1133                 param = ISCSI_FLASHNODE_TCP_TIMER_SCALE;
1134         } else if (attr == &dev_attr_fnode_tcp_timestamp_enable.attr) {
1135                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_EN;
1136         } else if (attr == &dev_attr_fnode_fragment_disable.attr) {
1137                 param = ISCSI_FLASHNODE_IP_FRAG_DISABLE;
1138         } else if (attr == &dev_attr_fnode_max_recv_dlength.attr) {
1139                 param = ISCSI_FLASHNODE_MAX_RECV_DLENGTH;
1140         } else if (attr == &dev_attr_fnode_max_xmit_dlength.attr) {
1141                 param = ISCSI_FLASHNODE_MAX_XMIT_DLENGTH;
1142         } else if (attr == &dev_attr_fnode_keepalive_tmo.attr) {
1143                 param = ISCSI_FLASHNODE_KEEPALIVE_TMO;
1144         } else if (attr == &dev_attr_fnode_port.attr) {
1145                 param = ISCSI_FLASHNODE_PORT;
1146         } else if (attr == &dev_attr_fnode_ipaddress.attr) {
1147                 param = ISCSI_FLASHNODE_IPADDR;
1148         } else if (attr == &dev_attr_fnode_redirect_ipaddr.attr) {
1149                 param = ISCSI_FLASHNODE_REDIRECT_IPADDR;
1150         } else if (attr == &dev_attr_fnode_max_segment_size.attr) {
1151                 param = ISCSI_FLASHNODE_MAX_SEGMENT_SIZE;
1152         } else if (attr == &dev_attr_fnode_local_port.attr) {
1153                 param = ISCSI_FLASHNODE_LOCAL_PORT;
1154         } else if (attr == &dev_attr_fnode_ipv4_tos.attr) {
1155                 param = ISCSI_FLASHNODE_IPV4_TOS;
1156         } else if (attr == &dev_attr_fnode_ipv6_traffic_class.attr) {
1157                 param = ISCSI_FLASHNODE_IPV6_TC;
1158         } else if (attr == &dev_attr_fnode_ipv6_flow_label.attr) {
1159                 param = ISCSI_FLASHNODE_IPV6_FLOW_LABEL;
1160         } else if (attr == &dev_attr_fnode_link_local_ipv6.attr) {
1161                 param = ISCSI_FLASHNODE_LINK_LOCAL_IPV6;
1162         } else if (attr == &dev_attr_fnode_tcp_xmit_wsf.attr) {
1163                 param = ISCSI_FLASHNODE_TCP_XMIT_WSF;
1164         } else if (attr == &dev_attr_fnode_tcp_recv_wsf.attr) {
1165                 param = ISCSI_FLASHNODE_TCP_RECV_WSF;
1166         } else if (attr == &dev_attr_fnode_statsn.attr) {
1167                 param = ISCSI_FLASHNODE_STATSN;
1168         } else if (attr == &dev_attr_fnode_exp_statsn.attr) {
1169                 param = ISCSI_FLASHNODE_EXP_STATSN;
1170         } else {
1171                 WARN_ONCE(1, "Invalid flashnode connection attr");
1172                 return 0;
1173         }
1174
1175         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
1176 }
1177
1178 static struct attribute_group iscsi_flashnode_conn_attr_group = {
1179         .attrs = iscsi_flashnode_conn_attrs,
1180         .is_visible = iscsi_flashnode_conn_attr_is_visible,
1181 };
1182
1183 static const struct attribute_group *iscsi_flashnode_conn_attr_groups[] = {
1184         &iscsi_flashnode_conn_attr_group,
1185         NULL,
1186 };
1187
1188 static void iscsi_flashnode_conn_release(struct device *dev)
1189 {
1190         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1191
1192         kfree(fnode_conn->ipaddress);
1193         kfree(fnode_conn->redirect_ipaddr);
1194         kfree(fnode_conn->link_local_ipv6_addr);
1195         kfree(fnode_conn);
1196 }
1197
1198 static const struct device_type iscsi_flashnode_conn_dev_type = {
1199         .name = "iscsi_flashnode_conn_dev_type",
1200         .groups = iscsi_flashnode_conn_attr_groups,
1201         .release = iscsi_flashnode_conn_release,
1202 };
1203
1204 static struct bus_type iscsi_flashnode_bus;
1205
1206 int iscsi_flashnode_bus_match(struct device *dev,
1207                                      struct device_driver *drv)
1208 {
1209         if (dev->bus == &iscsi_flashnode_bus)
1210                 return 1;
1211         return 0;
1212 }
1213 EXPORT_SYMBOL_GPL(iscsi_flashnode_bus_match);
1214
1215 static struct bus_type iscsi_flashnode_bus = {
1216         .name = "iscsi_flashnode",
1217         .match = &iscsi_flashnode_bus_match,
1218 };
1219
1220 /**
1221  * iscsi_create_flashnode_sess - Add flashnode session entry in sysfs
1222  * @shost: pointer to host data
1223  * @index: index of flashnode to add in sysfs
1224  * @transport: pointer to transport data
1225  * @dd_size: total size to allocate
1226  *
1227  * Adds a sysfs entry for the flashnode session attributes
1228  *
1229  * Returns:
1230  *  pointer to allocated flashnode sess on success
1231  *  %NULL on failure
1232  */
1233 struct iscsi_bus_flash_session *
1234 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
1235                             struct iscsi_transport *transport,
1236                             int dd_size)
1237 {
1238         struct iscsi_bus_flash_session *fnode_sess;
1239         int err;
1240
1241         fnode_sess = kzalloc(sizeof(*fnode_sess) + dd_size, GFP_KERNEL);
1242         if (!fnode_sess)
1243                 return NULL;
1244
1245         fnode_sess->transport = transport;
1246         fnode_sess->target_id = index;
1247         fnode_sess->dev.type = &iscsi_flashnode_sess_dev_type;
1248         fnode_sess->dev.bus = &iscsi_flashnode_bus;
1249         fnode_sess->dev.parent = &shost->shost_gendev;
1250         dev_set_name(&fnode_sess->dev, "flashnode_sess-%u:%u",
1251                      shost->host_no, index);
1252
1253         err = device_register(&fnode_sess->dev);
1254         if (err)
1255                 goto put_dev;
1256
1257         if (dd_size)
1258                 fnode_sess->dd_data = &fnode_sess[1];
1259
1260         return fnode_sess;
1261
1262 put_dev:
1263         put_device(&fnode_sess->dev);
1264         return NULL;
1265 }
1266 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_sess);
1267
1268 /**
1269  * iscsi_create_flashnode_conn - Add flashnode conn entry in sysfs
1270  * @shost: pointer to host data
1271  * @fnode_sess: pointer to the parent flashnode session entry
1272  * @transport: pointer to transport data
1273  * @dd_size: total size to allocate
1274  *
1275  * Adds a sysfs entry for the flashnode connection attributes
1276  *
1277  * Returns:
1278  *  pointer to allocated flashnode conn on success
1279  *  %NULL on failure
1280  */
1281 struct iscsi_bus_flash_conn *
1282 iscsi_create_flashnode_conn(struct Scsi_Host *shost,
1283                             struct iscsi_bus_flash_session *fnode_sess,
1284                             struct iscsi_transport *transport,
1285                             int dd_size)
1286 {
1287         struct iscsi_bus_flash_conn *fnode_conn;
1288         int err;
1289
1290         fnode_conn = kzalloc(sizeof(*fnode_conn) + dd_size, GFP_KERNEL);
1291         if (!fnode_conn)
1292                 return NULL;
1293
1294         fnode_conn->transport = transport;
1295         fnode_conn->dev.type = &iscsi_flashnode_conn_dev_type;
1296         fnode_conn->dev.bus = &iscsi_flashnode_bus;
1297         fnode_conn->dev.parent = &fnode_sess->dev;
1298         dev_set_name(&fnode_conn->dev, "flashnode_conn-%u:%u:0",
1299                      shost->host_no, fnode_sess->target_id);
1300
1301         err = device_register(&fnode_conn->dev);
1302         if (err)
1303                 goto put_dev;
1304
1305         if (dd_size)
1306                 fnode_conn->dd_data = &fnode_conn[1];
1307
1308         return fnode_conn;
1309
1310 put_dev:
1311         put_device(&fnode_conn->dev);
1312         return NULL;
1313 }
1314 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_conn);
1315
1316 /**
1317  * iscsi_is_flashnode_conn_dev - verify passed device is to be flashnode conn
1318  * @dev: device to verify
1319  * @data: pointer to data containing value to use for verification
1320  *
1321  * Verifies if the passed device is flashnode conn device
1322  *
1323  * Returns:
1324  *  1 on success
1325  *  0 on failure
1326  */
1327 static int iscsi_is_flashnode_conn_dev(struct device *dev, void *data)
1328 {
1329         return dev->bus == &iscsi_flashnode_bus;
1330 }
1331
1332 static int iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn *fnode_conn)
1333 {
1334         device_unregister(&fnode_conn->dev);
1335         return 0;
1336 }
1337
1338 static int flashnode_match_index(struct device *dev, void *data)
1339 {
1340         struct iscsi_bus_flash_session *fnode_sess = NULL;
1341         int ret = 0;
1342
1343         if (!iscsi_flashnode_bus_match(dev, NULL))
1344                 goto exit_match_index;
1345
1346         fnode_sess = iscsi_dev_to_flash_session(dev);
1347         ret = (fnode_sess->target_id == *((int *)data)) ? 1 : 0;
1348
1349 exit_match_index:
1350         return ret;
1351 }
1352
1353 /**
1354  * iscsi_get_flashnode_by_index -finds flashnode session entry by index
1355  * @shost: pointer to host data
1356  * @idx: index to match
1357  *
1358  * Finds the flashnode session object for the passed index
1359  *
1360  * Returns:
1361  *  pointer to found flashnode session object on success
1362  *  %NULL on failure
1363  */
1364 static struct iscsi_bus_flash_session *
1365 iscsi_get_flashnode_by_index(struct Scsi_Host *shost, uint32_t idx)
1366 {
1367         struct iscsi_bus_flash_session *fnode_sess = NULL;
1368         struct device *dev;
1369
1370         dev = device_find_child(&shost->shost_gendev, &idx,
1371                                 flashnode_match_index);
1372         if (dev)
1373                 fnode_sess = iscsi_dev_to_flash_session(dev);
1374
1375         return fnode_sess;
1376 }
1377
1378 /**
1379  * iscsi_find_flashnode_sess - finds flashnode session entry
1380  * @shost: pointer to host data
1381  * @data: pointer to data containing value to use for comparison
1382  * @fn: function pointer that does actual comparison
1383  *
1384  * Finds the flashnode session object comparing the data passed using logic
1385  * defined in passed function pointer
1386  *
1387  * Returns:
1388  *  pointer to found flashnode session device object on success
1389  *  %NULL on failure
1390  */
1391 struct device *
1392 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
1393                           int (*fn)(struct device *dev, void *data))
1394 {
1395         return device_find_child(&shost->shost_gendev, data, fn);
1396 }
1397 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_sess);
1398
1399 /**
1400  * iscsi_find_flashnode_conn - finds flashnode connection entry
1401  * @fnode_sess: pointer to parent flashnode session entry
1402  *
1403  * Finds the flashnode connection object comparing the data passed using logic
1404  * defined in passed function pointer
1405  *
1406  * Returns:
1407  *  pointer to found flashnode connection device object on success
1408  *  %NULL on failure
1409  */
1410 struct device *
1411 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess)
1412 {
1413         return device_find_child(&fnode_sess->dev, NULL,
1414                                  iscsi_is_flashnode_conn_dev);
1415 }
1416 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_conn);
1417
1418 static int iscsi_iter_destroy_flashnode_conn_fn(struct device *dev, void *data)
1419 {
1420         if (!iscsi_is_flashnode_conn_dev(dev, NULL))
1421                 return 0;
1422
1423         return iscsi_destroy_flashnode_conn(iscsi_dev_to_flash_conn(dev));
1424 }
1425
1426 /**
1427  * iscsi_destroy_flashnode_sess - destroy flashnode session entry
1428  * @fnode_sess: pointer to flashnode session entry to be destroyed
1429  *
1430  * Deletes the flashnode session entry and all children flashnode connection
1431  * entries from sysfs
1432  */
1433 void iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess)
1434 {
1435         int err;
1436
1437         err = device_for_each_child(&fnode_sess->dev, NULL,
1438                                     iscsi_iter_destroy_flashnode_conn_fn);
1439         if (err)
1440                 pr_err("Could not delete all connections for %s. Error %d.\n",
1441                        fnode_sess->dev.kobj.name, err);
1442
1443         device_unregister(&fnode_sess->dev);
1444 }
1445 EXPORT_SYMBOL_GPL(iscsi_destroy_flashnode_sess);
1446
1447 static int iscsi_iter_destroy_flashnode_fn(struct device *dev, void *data)
1448 {
1449         if (!iscsi_flashnode_bus_match(dev, NULL))
1450                 return 0;
1451
1452         iscsi_destroy_flashnode_sess(iscsi_dev_to_flash_session(dev));
1453         return 0;
1454 }
1455
1456 /**
1457  * iscsi_destroy_all_flashnode - destroy all flashnode session entries
1458  * @shost: pointer to host data
1459  *
1460  * Destroys all the flashnode session entries and all corresponding children
1461  * flashnode connection entries from sysfs
1462  */
1463 void iscsi_destroy_all_flashnode(struct Scsi_Host *shost)
1464 {
1465         device_for_each_child(&shost->shost_gendev, NULL,
1466                               iscsi_iter_destroy_flashnode_fn);
1467 }
1468 EXPORT_SYMBOL_GPL(iscsi_destroy_all_flashnode);
1469
1470 /*
1471  * BSG support
1472  */
1473 /**
1474  * iscsi_bsg_host_dispatch - Dispatch command to LLD.
1475  * @job: bsg job to be processed
1476  */
1477 static int iscsi_bsg_host_dispatch(struct bsg_job *job)
1478 {
1479         struct Scsi_Host *shost = iscsi_job_to_shost(job);
1480         struct iscsi_bsg_request *req = job->request;
1481         struct iscsi_bsg_reply *reply = job->reply;
1482         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1483         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
1484         int ret;
1485
1486         /* check if we have the msgcode value at least */
1487         if (job->request_len < sizeof(uint32_t)) {
1488                 ret = -ENOMSG;
1489                 goto fail_host_msg;
1490         }
1491
1492         /* Validate the host command */
1493         switch (req->msgcode) {
1494         case ISCSI_BSG_HST_VENDOR:
1495                 cmdlen += sizeof(struct iscsi_bsg_host_vendor);
1496                 if ((shost->hostt->vendor_id == 0L) ||
1497                     (req->rqst_data.h_vendor.vendor_id !=
1498                         shost->hostt->vendor_id)) {
1499                         ret = -ESRCH;
1500                         goto fail_host_msg;
1501                 }
1502                 break;
1503         default:
1504                 ret = -EBADR;
1505                 goto fail_host_msg;
1506         }
1507
1508         /* check if we really have all the request data needed */
1509         if (job->request_len < cmdlen) {
1510                 ret = -ENOMSG;
1511                 goto fail_host_msg;
1512         }
1513
1514         ret = i->iscsi_transport->bsg_request(job);
1515         if (!ret)
1516                 return 0;
1517
1518 fail_host_msg:
1519         /* return the errno failure code as the only status */
1520         BUG_ON(job->reply_len < sizeof(uint32_t));
1521         reply->reply_payload_rcv_len = 0;
1522         reply->result = ret;
1523         job->reply_len = sizeof(uint32_t);
1524         bsg_job_done(job, ret, 0);
1525         return 0;
1526 }
1527
1528 /**
1529  * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
1530  * @shost: shost for iscsi_host
1531  * @ihost: iscsi_cls_host adding the structures to
1532  */
1533 static int
1534 iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
1535 {
1536         struct device *dev = &shost->shost_gendev;
1537         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1538         struct request_queue *q;
1539         char bsg_name[20];
1540
1541         if (!i->iscsi_transport->bsg_request)
1542                 return -ENOTSUPP;
1543
1544         snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
1545         q = bsg_setup_queue(dev, bsg_name, iscsi_bsg_host_dispatch, NULL, 0);
1546         if (IS_ERR(q)) {
1547                 shost_printk(KERN_ERR, shost, "bsg interface failed to "
1548                              "initialize - no request queue\n");
1549                 return PTR_ERR(q);
1550         }
1551         __scsi_init_queue(shost, q);
1552
1553         ihost->bsg_q = q;
1554         return 0;
1555 }
1556
1557 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
1558                             struct device *cdev)
1559 {
1560         struct Scsi_Host *shost = dev_to_shost(dev);
1561         struct iscsi_cls_host *ihost = shost->shost_data;
1562
1563         memset(ihost, 0, sizeof(*ihost));
1564         mutex_init(&ihost->mutex);
1565
1566         iscsi_bsg_host_add(shost, ihost);
1567         /* ignore any bsg add error - we just can't do sgio */
1568
1569         return 0;
1570 }
1571
1572 static int iscsi_remove_host(struct transport_container *tc,
1573                              struct device *dev, struct device *cdev)
1574 {
1575         struct Scsi_Host *shost = dev_to_shost(dev);
1576         struct iscsi_cls_host *ihost = shost->shost_data;
1577
1578         bsg_remove_queue(ihost->bsg_q);
1579         return 0;
1580 }
1581
1582 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
1583                                "iscsi_host",
1584                                iscsi_setup_host,
1585                                iscsi_remove_host,
1586                                NULL);
1587
1588 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
1589                                "iscsi_session",
1590                                NULL,
1591                                NULL,
1592                                NULL);
1593
1594 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
1595                                "iscsi_connection",
1596                                NULL,
1597                                NULL,
1598                                NULL);
1599
1600 static struct sock *nls;
1601 static DEFINE_MUTEX(rx_queue_mutex);
1602
1603 static LIST_HEAD(sesslist);
1604 static DEFINE_SPINLOCK(sesslock);
1605 static LIST_HEAD(connlist);
1606 static LIST_HEAD(connlist_err);
1607 static DEFINE_SPINLOCK(connlock);
1608
1609 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1610 {
1611         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1612         return sess->sid;
1613 }
1614
1615 /*
1616  * Returns the matching session to a given sid
1617  */
1618 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1619 {
1620         unsigned long flags;
1621         struct iscsi_cls_session *sess;
1622
1623         spin_lock_irqsave(&sesslock, flags);
1624         list_for_each_entry(sess, &sesslist, sess_list) {
1625                 if (sess->sid == sid) {
1626                         spin_unlock_irqrestore(&sesslock, flags);
1627                         return sess;
1628                 }
1629         }
1630         spin_unlock_irqrestore(&sesslock, flags);
1631         return NULL;
1632 }
1633
1634 /*
1635  * Returns the matching connection to a given sid / cid tuple
1636  */
1637 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1638 {
1639         unsigned long flags;
1640         struct iscsi_cls_conn *conn;
1641
1642         spin_lock_irqsave(&connlock, flags);
1643         list_for_each_entry(conn, &connlist, conn_list) {
1644                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1645                         spin_unlock_irqrestore(&connlock, flags);
1646                         return conn;
1647                 }
1648         }
1649         spin_unlock_irqrestore(&connlock, flags);
1650         return NULL;
1651 }
1652
1653 /*
1654  * The following functions can be used by LLDs that allocate
1655  * their own scsi_hosts or by software iscsi LLDs
1656  */
1657 static struct {
1658         int value;
1659         char *name;
1660 } iscsi_session_state_names[] = {
1661         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
1662         { ISCSI_SESSION_FAILED,         "FAILED" },
1663         { ISCSI_SESSION_FREE,           "FREE" },
1664 };
1665
1666 static const char *iscsi_session_state_name(int state)
1667 {
1668         int i;
1669         char *name = NULL;
1670
1671         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1672                 if (iscsi_session_state_names[i].value == state) {
1673                         name = iscsi_session_state_names[i].name;
1674                         break;
1675                 }
1676         }
1677         return name;
1678 }
1679
1680 static char *iscsi_session_target_state_name[] = {
1681         [ISCSI_SESSION_TARGET_UNBOUND]   = "UNBOUND",
1682         [ISCSI_SESSION_TARGET_ALLOCATED] = "ALLOCATED",
1683         [ISCSI_SESSION_TARGET_SCANNED]   = "SCANNED",
1684         [ISCSI_SESSION_TARGET_UNBINDING] = "UNBINDING",
1685 };
1686
1687 int iscsi_session_chkready(struct iscsi_cls_session *session)
1688 {
1689         int err;
1690
1691         switch (session->state) {
1692         case ISCSI_SESSION_LOGGED_IN:
1693                 err = 0;
1694                 break;
1695         case ISCSI_SESSION_FAILED:
1696                 err = DID_IMM_RETRY << 16;
1697                 break;
1698         case ISCSI_SESSION_FREE:
1699                 err = DID_TRANSPORT_FAILFAST << 16;
1700                 break;
1701         default:
1702                 err = DID_NO_CONNECT << 16;
1703                 break;
1704         }
1705         return err;
1706 }
1707 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1708
1709 int iscsi_is_session_online(struct iscsi_cls_session *session)
1710 {
1711         unsigned long flags;
1712         int ret = 0;
1713
1714         spin_lock_irqsave(&session->lock, flags);
1715         if (session->state == ISCSI_SESSION_LOGGED_IN)
1716                 ret = 1;
1717         spin_unlock_irqrestore(&session->lock, flags);
1718         return ret;
1719 }
1720 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1721
1722 static void iscsi_session_release(struct device *dev)
1723 {
1724         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
1725         struct Scsi_Host *shost;
1726
1727         shost = iscsi_session_to_shost(session);
1728         scsi_host_put(shost);
1729         ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1730         kfree(session);
1731 }
1732
1733 int iscsi_is_session_dev(const struct device *dev)
1734 {
1735         return dev->release == iscsi_session_release;
1736 }
1737 EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1738
1739 static int iscsi_iter_session_fn(struct device *dev, void *data)
1740 {
1741         void (* fn) (struct iscsi_cls_session *) = data;
1742
1743         if (!iscsi_is_session_dev(dev))
1744                 return 0;
1745         fn(iscsi_dev_to_session(dev));
1746         return 0;
1747 }
1748
1749 void iscsi_host_for_each_session(struct Scsi_Host *shost,
1750                                  void (*fn)(struct iscsi_cls_session *))
1751 {
1752         device_for_each_child(&shost->shost_gendev, fn,
1753                               iscsi_iter_session_fn);
1754 }
1755 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1756
1757 struct iscsi_scan_data {
1758         unsigned int channel;
1759         unsigned int id;
1760         u64 lun;
1761         enum scsi_scan_mode rescan;
1762 };
1763
1764 static int iscsi_user_scan_session(struct device *dev, void *data)
1765 {
1766         struct iscsi_scan_data *scan_data = data;
1767         struct iscsi_cls_session *session;
1768         struct Scsi_Host *shost;
1769         struct iscsi_cls_host *ihost;
1770         unsigned long flags;
1771         unsigned int id;
1772
1773         if (!iscsi_is_session_dev(dev))
1774                 return 0;
1775
1776         session = iscsi_dev_to_session(dev);
1777
1778         ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1779
1780         shost = iscsi_session_to_shost(session);
1781         ihost = shost->shost_data;
1782
1783         mutex_lock(&ihost->mutex);
1784         spin_lock_irqsave(&session->lock, flags);
1785         if (session->state != ISCSI_SESSION_LOGGED_IN) {
1786                 spin_unlock_irqrestore(&session->lock, flags);
1787                 goto user_scan_exit;
1788         }
1789         id = session->target_id;
1790         spin_unlock_irqrestore(&session->lock, flags);
1791
1792         if (id != ISCSI_MAX_TARGET) {
1793                 if ((scan_data->channel == SCAN_WILD_CARD ||
1794                      scan_data->channel == 0) &&
1795                     (scan_data->id == SCAN_WILD_CARD ||
1796                      scan_data->id == id)) {
1797                         scsi_scan_target(&session->dev, 0, id,
1798                                          scan_data->lun, scan_data->rescan);
1799                         spin_lock_irqsave(&session->lock, flags);
1800                         session->target_state = ISCSI_SESSION_TARGET_SCANNED;
1801                         spin_unlock_irqrestore(&session->lock, flags);
1802                 }
1803         }
1804
1805 user_scan_exit:
1806         mutex_unlock(&ihost->mutex);
1807         ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1808         return 0;
1809 }
1810
1811 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1812                            uint id, u64 lun)
1813 {
1814         struct iscsi_scan_data scan_data;
1815
1816         scan_data.channel = channel;
1817         scan_data.id = id;
1818         scan_data.lun = lun;
1819         scan_data.rescan = SCSI_SCAN_MANUAL;
1820
1821         return device_for_each_child(&shost->shost_gendev, &scan_data,
1822                                      iscsi_user_scan_session);
1823 }
1824
1825 static void iscsi_scan_session(struct work_struct *work)
1826 {
1827         struct iscsi_cls_session *session =
1828                         container_of(work, struct iscsi_cls_session, scan_work);
1829         struct iscsi_scan_data scan_data;
1830
1831         scan_data.channel = 0;
1832         scan_data.id = SCAN_WILD_CARD;
1833         scan_data.lun = SCAN_WILD_CARD;
1834         scan_data.rescan = SCSI_SCAN_RESCAN;
1835
1836         iscsi_user_scan_session(&session->dev, &scan_data);
1837 }
1838
1839 /**
1840  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1841  * @cmd: scsi cmd passed to scsi eh handler
1842  *
1843  * If the session is down this function will wait for the recovery
1844  * timer to fire or for the session to be logged back in. If the
1845  * recovery timer fires then FAST_IO_FAIL is returned. The caller
1846  * should pass this error value to the scsi eh.
1847  */
1848 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1849 {
1850         struct iscsi_cls_session *session =
1851                         starget_to_session(scsi_target(cmd->device));
1852         unsigned long flags;
1853         int ret = 0;
1854
1855         spin_lock_irqsave(&session->lock, flags);
1856         while (session->state != ISCSI_SESSION_LOGGED_IN) {
1857                 if (session->state == ISCSI_SESSION_FREE) {
1858                         ret = FAST_IO_FAIL;
1859                         break;
1860                 }
1861                 spin_unlock_irqrestore(&session->lock, flags);
1862                 msleep(1000);
1863                 spin_lock_irqsave(&session->lock, flags);
1864         }
1865         spin_unlock_irqrestore(&session->lock, flags);
1866         return ret;
1867 }
1868 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1869
1870 static void session_recovery_timedout(struct work_struct *work)
1871 {
1872         struct iscsi_cls_session *session =
1873                 container_of(work, struct iscsi_cls_session,
1874                              recovery_work.work);
1875         unsigned long flags;
1876
1877         iscsi_cls_session_printk(KERN_INFO, session,
1878                                  "session recovery timed out after %d secs\n",
1879                                  session->recovery_tmo);
1880
1881         spin_lock_irqsave(&session->lock, flags);
1882         switch (session->state) {
1883         case ISCSI_SESSION_FAILED:
1884                 session->state = ISCSI_SESSION_FREE;
1885                 break;
1886         case ISCSI_SESSION_LOGGED_IN:
1887         case ISCSI_SESSION_FREE:
1888                 /* we raced with the unblock's flush */
1889                 spin_unlock_irqrestore(&session->lock, flags);
1890                 return;
1891         }
1892         spin_unlock_irqrestore(&session->lock, flags);
1893
1894         ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1895         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1896         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1897
1898         if (session->transport->session_recovery_timedout)
1899                 session->transport->session_recovery_timedout(session);
1900 }
1901
1902 static void __iscsi_unblock_session(struct work_struct *work)
1903 {
1904         struct iscsi_cls_session *session =
1905                         container_of(work, struct iscsi_cls_session,
1906                                      unblock_work);
1907         unsigned long flags;
1908
1909         ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1910
1911         cancel_delayed_work_sync(&session->recovery_work);
1912         spin_lock_irqsave(&session->lock, flags);
1913         session->state = ISCSI_SESSION_LOGGED_IN;
1914         spin_unlock_irqrestore(&session->lock, flags);
1915         /* start IO */
1916         scsi_target_unblock(&session->dev, SDEV_RUNNING);
1917         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1918 }
1919
1920 /**
1921  * iscsi_unblock_session - set a session as logged in and start IO.
1922  * @session: iscsi session
1923  *
1924  * Mark a session as ready to accept IO.
1925  */
1926 void iscsi_unblock_session(struct iscsi_cls_session *session)
1927 {
1928         if (!cancel_work_sync(&session->block_work))
1929                 cancel_delayed_work_sync(&session->recovery_work);
1930
1931         queue_work(session->workq, &session->unblock_work);
1932         /*
1933          * Blocking the session can be done from any context so we only
1934          * queue the block work. Make sure the unblock work has completed
1935          * because it flushes/cancels the other works and updates the state.
1936          */
1937         flush_work(&session->unblock_work);
1938 }
1939 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1940
1941 static void __iscsi_block_session(struct work_struct *work)
1942 {
1943         struct iscsi_cls_session *session =
1944                         container_of(work, struct iscsi_cls_session,
1945                                      block_work);
1946         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1947         unsigned long flags;
1948
1949         ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1950         spin_lock_irqsave(&session->lock, flags);
1951         session->state = ISCSI_SESSION_FAILED;
1952         spin_unlock_irqrestore(&session->lock, flags);
1953         scsi_block_targets(shost, &session->dev);
1954         ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
1955         if (session->recovery_tmo >= 0)
1956                 queue_delayed_work(session->workq,
1957                                    &session->recovery_work,
1958                                    session->recovery_tmo * HZ);
1959 }
1960
1961 void iscsi_block_session(struct iscsi_cls_session *session)
1962 {
1963         queue_work(session->workq, &session->block_work);
1964 }
1965 EXPORT_SYMBOL_GPL(iscsi_block_session);
1966
1967 static void __iscsi_unbind_session(struct work_struct *work)
1968 {
1969         struct iscsi_cls_session *session =
1970                         container_of(work, struct iscsi_cls_session,
1971                                      unbind_work);
1972         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1973         struct iscsi_cls_host *ihost = shost->shost_data;
1974         unsigned long flags;
1975         unsigned int target_id;
1976         bool remove_target = true;
1977
1978         ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
1979
1980         /* Prevent new scans and make sure scanning is not in progress */
1981         mutex_lock(&ihost->mutex);
1982         spin_lock_irqsave(&session->lock, flags);
1983         if (session->target_state == ISCSI_SESSION_TARGET_ALLOCATED) {
1984                 remove_target = false;
1985         } else if (session->target_state != ISCSI_SESSION_TARGET_SCANNED) {
1986                 spin_unlock_irqrestore(&session->lock, flags);
1987                 mutex_unlock(&ihost->mutex);
1988                 ISCSI_DBG_TRANS_SESSION(session,
1989                         "Skipping target unbinding: Session is unbound/unbinding.\n");
1990                 return;
1991         }
1992
1993         session->target_state = ISCSI_SESSION_TARGET_UNBINDING;
1994         target_id = session->target_id;
1995         session->target_id = ISCSI_MAX_TARGET;
1996         spin_unlock_irqrestore(&session->lock, flags);
1997         mutex_unlock(&ihost->mutex);
1998
1999         if (remove_target)
2000                 scsi_remove_target(&session->dev);
2001
2002         if (session->ida_used)
2003                 ida_free(&iscsi_sess_ida, target_id);
2004
2005         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
2006         ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
2007
2008         spin_lock_irqsave(&session->lock, flags);
2009         session->target_state = ISCSI_SESSION_TARGET_UNBOUND;
2010         spin_unlock_irqrestore(&session->lock, flags);
2011 }
2012
2013 static void __iscsi_destroy_session(struct work_struct *work)
2014 {
2015         struct iscsi_cls_session *session =
2016                 container_of(work, struct iscsi_cls_session, destroy_work);
2017
2018         session->transport->destroy_session(session);
2019 }
2020
2021 struct iscsi_cls_session *
2022 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2023                     int dd_size)
2024 {
2025         struct iscsi_cls_session *session;
2026
2027         session = kzalloc(sizeof(*session) + dd_size,
2028                           GFP_KERNEL);
2029         if (!session)
2030                 return NULL;
2031
2032         session->transport = transport;
2033         session->creator = -1;
2034         session->recovery_tmo = 120;
2035         session->recovery_tmo_sysfs_override = false;
2036         session->state = ISCSI_SESSION_FREE;
2037         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
2038         INIT_LIST_HEAD(&session->sess_list);
2039         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
2040         INIT_WORK(&session->block_work, __iscsi_block_session);
2041         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
2042         INIT_WORK(&session->scan_work, iscsi_scan_session);
2043         INIT_WORK(&session->destroy_work, __iscsi_destroy_session);
2044         spin_lock_init(&session->lock);
2045
2046         /* this is released in the dev's release function */
2047         scsi_host_get(shost);
2048         session->dev.parent = &shost->shost_gendev;
2049         session->dev.release = iscsi_session_release;
2050         device_initialize(&session->dev);
2051         if (dd_size)
2052                 session->dd_data = &session[1];
2053
2054         ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
2055         return session;
2056 }
2057 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2058
2059 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
2060 {
2061         struct Scsi_Host *shost = iscsi_session_to_shost(session);
2062         unsigned long flags;
2063         int id = 0;
2064         int err;
2065
2066         session->sid = atomic_add_return(1, &iscsi_session_nr);
2067
2068         session->workq = alloc_workqueue("iscsi_ctrl_%d:%d",
2069                         WQ_SYSFS | WQ_MEM_RECLAIM | WQ_UNBOUND, 0,
2070                         shost->host_no, session->sid);
2071         if (!session->workq)
2072                 return -ENOMEM;
2073
2074         if (target_id == ISCSI_MAX_TARGET) {
2075                 id = ida_alloc(&iscsi_sess_ida, GFP_KERNEL);
2076
2077                 if (id < 0) {
2078                         iscsi_cls_session_printk(KERN_ERR, session,
2079                                         "Failure in Target ID Allocation\n");
2080                         err = id;
2081                         goto destroy_wq;
2082                 }
2083                 session->target_id = (unsigned int)id;
2084                 session->ida_used = true;
2085         } else
2086                 session->target_id = target_id;
2087         spin_lock_irqsave(&session->lock, flags);
2088         session->target_state = ISCSI_SESSION_TARGET_ALLOCATED;
2089         spin_unlock_irqrestore(&session->lock, flags);
2090
2091         dev_set_name(&session->dev, "session%u", session->sid);
2092         err = device_add(&session->dev);
2093         if (err) {
2094                 iscsi_cls_session_printk(KERN_ERR, session,
2095                                          "could not register session's dev\n");
2096                 goto release_ida;
2097         }
2098         err = transport_register_device(&session->dev);
2099         if (err) {
2100                 iscsi_cls_session_printk(KERN_ERR, session,
2101                                          "could not register transport's dev\n");
2102                 goto release_dev;
2103         }
2104
2105         spin_lock_irqsave(&sesslock, flags);
2106         list_add(&session->sess_list, &sesslist);
2107         spin_unlock_irqrestore(&sesslock, flags);
2108
2109         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
2110         ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
2111         return 0;
2112
2113 release_dev:
2114         device_del(&session->dev);
2115 release_ida:
2116         if (session->ida_used)
2117                 ida_free(&iscsi_sess_ida, session->target_id);
2118 destroy_wq:
2119         destroy_workqueue(session->workq);
2120         return err;
2121 }
2122 EXPORT_SYMBOL_GPL(iscsi_add_session);
2123
2124 /**
2125  * iscsi_create_session - create iscsi class session
2126  * @shost: scsi host
2127  * @transport: iscsi transport
2128  * @dd_size: private driver data size
2129  * @target_id: which target
2130  *
2131  * This can be called from a LLD or iscsi_transport.
2132  */
2133 struct iscsi_cls_session *
2134 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2135                      int dd_size, unsigned int target_id)
2136 {
2137         struct iscsi_cls_session *session;
2138
2139         session = iscsi_alloc_session(shost, transport, dd_size);
2140         if (!session)
2141                 return NULL;
2142
2143         if (iscsi_add_session(session, target_id)) {
2144                 iscsi_free_session(session);
2145                 return NULL;
2146         }
2147         return session;
2148 }
2149 EXPORT_SYMBOL_GPL(iscsi_create_session);
2150
2151 static void iscsi_conn_release(struct device *dev)
2152 {
2153         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
2154         struct device *parent = conn->dev.parent;
2155
2156         ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
2157         kfree(conn);
2158         put_device(parent);
2159 }
2160
2161 static int iscsi_is_conn_dev(const struct device *dev)
2162 {
2163         return dev->release == iscsi_conn_release;
2164 }
2165
2166 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
2167 {
2168         if (!iscsi_is_conn_dev(dev))
2169                 return 0;
2170
2171         iscsi_remove_conn(iscsi_dev_to_conn(dev));
2172         return 0;
2173 }
2174
2175 void iscsi_remove_session(struct iscsi_cls_session *session)
2176 {
2177         unsigned long flags;
2178         int err;
2179
2180         ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
2181
2182         spin_lock_irqsave(&sesslock, flags);
2183         if (!list_empty(&session->sess_list))
2184                 list_del(&session->sess_list);
2185         spin_unlock_irqrestore(&sesslock, flags);
2186
2187         if (!cancel_work_sync(&session->block_work))
2188                 cancel_delayed_work_sync(&session->recovery_work);
2189         cancel_work_sync(&session->unblock_work);
2190         /*
2191          * If we are blocked let commands flow again. The lld or iscsi
2192          * layer should set up the queuecommand to fail commands.
2193          * We assume that LLD will not be calling block/unblock while
2194          * removing the session.
2195          */
2196         spin_lock_irqsave(&session->lock, flags);
2197         session->state = ISCSI_SESSION_FREE;
2198         spin_unlock_irqrestore(&session->lock, flags);
2199
2200         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
2201         /*
2202          * qla4xxx can perform it's own scans when it runs in kernel only
2203          * mode. Make sure to flush those scans.
2204          */
2205         flush_work(&session->scan_work);
2206         /* flush running unbind operations */
2207         flush_work(&session->unbind_work);
2208         __iscsi_unbind_session(&session->unbind_work);
2209
2210         /* hw iscsi may not have removed all connections from session */
2211         err = device_for_each_child(&session->dev, NULL,
2212                                     iscsi_iter_destroy_conn_fn);
2213         if (err)
2214                 iscsi_cls_session_printk(KERN_ERR, session,
2215                                          "Could not delete all connections "
2216                                          "for session. Error %d.\n", err);
2217
2218         transport_unregister_device(&session->dev);
2219
2220         destroy_workqueue(session->workq);
2221
2222         ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
2223         device_del(&session->dev);
2224 }
2225 EXPORT_SYMBOL_GPL(iscsi_remove_session);
2226
2227 static void iscsi_stop_conn(struct iscsi_cls_conn *conn, int flag)
2228 {
2229         ISCSI_DBG_TRANS_CONN(conn, "Stopping conn.\n");
2230
2231         switch (flag) {
2232         case STOP_CONN_RECOVER:
2233                 WRITE_ONCE(conn->state, ISCSI_CONN_FAILED);
2234                 break;
2235         case STOP_CONN_TERM:
2236                 WRITE_ONCE(conn->state, ISCSI_CONN_DOWN);
2237                 break;
2238         default:
2239                 iscsi_cls_conn_printk(KERN_ERR, conn, "invalid stop flag %d\n",
2240                                       flag);
2241                 return;
2242         }
2243
2244         conn->transport->stop_conn(conn, flag);
2245         ISCSI_DBG_TRANS_CONN(conn, "Stopping conn done.\n");
2246 }
2247
2248 static void iscsi_ep_disconnect(struct iscsi_cls_conn *conn, bool is_active)
2249 {
2250         struct iscsi_cls_session *session = iscsi_conn_to_session(conn);
2251         struct iscsi_endpoint *ep;
2252
2253         ISCSI_DBG_TRANS_CONN(conn, "disconnect ep.\n");
2254         WRITE_ONCE(conn->state, ISCSI_CONN_FAILED);
2255
2256         if (!conn->ep || !session->transport->ep_disconnect)
2257                 return;
2258
2259         ep = conn->ep;
2260         conn->ep = NULL;
2261
2262         session->transport->unbind_conn(conn, is_active);
2263         session->transport->ep_disconnect(ep);
2264         ISCSI_DBG_TRANS_CONN(conn, "disconnect ep done.\n");
2265 }
2266
2267 static void iscsi_if_disconnect_bound_ep(struct iscsi_cls_conn *conn,
2268                                          struct iscsi_endpoint *ep,
2269                                          bool is_active)
2270 {
2271         /* Check if this was a conn error and the kernel took ownership */
2272         spin_lock_irq(&conn->lock);
2273         if (!test_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
2274                 spin_unlock_irq(&conn->lock);
2275                 iscsi_ep_disconnect(conn, is_active);
2276         } else {
2277                 spin_unlock_irq(&conn->lock);
2278                 ISCSI_DBG_TRANS_CONN(conn, "flush kernel conn cleanup.\n");
2279                 mutex_unlock(&conn->ep_mutex);
2280
2281                 flush_work(&conn->cleanup_work);
2282                 /*
2283                  * Userspace is now done with the EP so we can release the ref
2284                  * iscsi_cleanup_conn_work_fn took.
2285                  */
2286                 iscsi_put_endpoint(ep);
2287                 mutex_lock(&conn->ep_mutex);
2288         }
2289 }
2290
2291 static int iscsi_if_stop_conn(struct iscsi_cls_conn *conn, int flag)
2292 {
2293         ISCSI_DBG_TRANS_CONN(conn, "iscsi if conn stop.\n");
2294         /*
2295          * For offload, iscsid may not know about the ep like when iscsid is
2296          * restarted or for kernel based session shutdown iscsid is not even
2297          * up. For these cases, we do the disconnect now.
2298          */
2299         mutex_lock(&conn->ep_mutex);
2300         if (conn->ep)
2301                 iscsi_if_disconnect_bound_ep(conn, conn->ep, true);
2302         mutex_unlock(&conn->ep_mutex);
2303
2304         /*
2305          * If this is a termination we have to call stop_conn with that flag
2306          * so the correct states get set. If we haven't run the work yet try to
2307          * avoid the extra run.
2308          */
2309         if (flag == STOP_CONN_TERM) {
2310                 cancel_work_sync(&conn->cleanup_work);
2311                 iscsi_stop_conn(conn, flag);
2312         } else {
2313                 /*
2314                  * Figure out if it was the kernel or userspace initiating this.
2315                  */
2316                 spin_lock_irq(&conn->lock);
2317                 if (!test_and_set_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
2318                         spin_unlock_irq(&conn->lock);
2319                         iscsi_stop_conn(conn, flag);
2320                 } else {
2321                         spin_unlock_irq(&conn->lock);
2322                         ISCSI_DBG_TRANS_CONN(conn,
2323                                              "flush kernel conn cleanup.\n");
2324                         flush_work(&conn->cleanup_work);
2325                 }
2326                 /*
2327                  * Only clear for recovery to avoid extra cleanup runs during
2328                  * termination.
2329                  */
2330                 spin_lock_irq(&conn->lock);
2331                 clear_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags);
2332                 spin_unlock_irq(&conn->lock);
2333         }
2334         ISCSI_DBG_TRANS_CONN(conn, "iscsi if conn stop done.\n");
2335         return 0;
2336 }
2337
2338 static void iscsi_cleanup_conn_work_fn(struct work_struct *work)
2339 {
2340         struct iscsi_cls_conn *conn = container_of(work, struct iscsi_cls_conn,
2341                                                    cleanup_work);
2342         struct iscsi_cls_session *session = iscsi_conn_to_session(conn);
2343
2344         mutex_lock(&conn->ep_mutex);
2345         /*
2346          * Get a ref to the ep, so we don't release its ID until after
2347          * userspace is done referencing it in iscsi_if_disconnect_bound_ep.
2348          */
2349         if (conn->ep)
2350                 get_device(&conn->ep->dev);
2351         iscsi_ep_disconnect(conn, false);
2352
2353         if (system_state != SYSTEM_RUNNING) {
2354                 /*
2355                  * If the user has set up for the session to never timeout
2356                  * then hang like they wanted. For all other cases fail right
2357                  * away since userspace is not going to relogin.
2358                  */
2359                 if (session->recovery_tmo > 0)
2360                         session->recovery_tmo = 0;
2361         }
2362
2363         iscsi_stop_conn(conn, STOP_CONN_RECOVER);
2364         mutex_unlock(&conn->ep_mutex);
2365         ISCSI_DBG_TRANS_CONN(conn, "cleanup done.\n");
2366 }
2367
2368 static int iscsi_iter_force_destroy_conn_fn(struct device *dev, void *data)
2369 {
2370         struct iscsi_transport *transport;
2371         struct iscsi_cls_conn *conn;
2372
2373         if (!iscsi_is_conn_dev(dev))
2374                 return 0;
2375
2376         conn = iscsi_dev_to_conn(dev);
2377         transport = conn->transport;
2378
2379         if (READ_ONCE(conn->state) != ISCSI_CONN_DOWN)
2380                 iscsi_if_stop_conn(conn, STOP_CONN_TERM);
2381
2382         transport->destroy_conn(conn);
2383         return 0;
2384 }
2385
2386 /**
2387  * iscsi_force_destroy_session - destroy a session from the kernel
2388  * @session: session to destroy
2389  *
2390  * Force the destruction of a session from the kernel. This should only be
2391  * used when userspace is no longer running during system shutdown.
2392  */
2393 void iscsi_force_destroy_session(struct iscsi_cls_session *session)
2394 {
2395         struct iscsi_transport *transport = session->transport;
2396         unsigned long flags;
2397
2398         WARN_ON_ONCE(system_state == SYSTEM_RUNNING);
2399
2400         spin_lock_irqsave(&sesslock, flags);
2401         if (list_empty(&session->sess_list)) {
2402                 spin_unlock_irqrestore(&sesslock, flags);
2403                 /*
2404                  * Conn/ep is already freed. Session is being torn down via
2405                  * async path. For shutdown we don't care about it so return.
2406                  */
2407                 return;
2408         }
2409         spin_unlock_irqrestore(&sesslock, flags);
2410
2411         device_for_each_child(&session->dev, NULL,
2412                               iscsi_iter_force_destroy_conn_fn);
2413         transport->destroy_session(session);
2414 }
2415 EXPORT_SYMBOL_GPL(iscsi_force_destroy_session);
2416
2417 void iscsi_free_session(struct iscsi_cls_session *session)
2418 {
2419         ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
2420         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
2421         put_device(&session->dev);
2422 }
2423 EXPORT_SYMBOL_GPL(iscsi_free_session);
2424
2425 /**
2426  * iscsi_alloc_conn - alloc iscsi class connection
2427  * @session: iscsi cls session
2428  * @dd_size: private driver data size
2429  * @cid: connection id
2430  */
2431 struct iscsi_cls_conn *
2432 iscsi_alloc_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
2433 {
2434         struct iscsi_transport *transport = session->transport;
2435         struct iscsi_cls_conn *conn;
2436
2437         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
2438         if (!conn)
2439                 return NULL;
2440         if (dd_size)
2441                 conn->dd_data = &conn[1];
2442
2443         mutex_init(&conn->ep_mutex);
2444         spin_lock_init(&conn->lock);
2445         INIT_LIST_HEAD(&conn->conn_list);
2446         INIT_WORK(&conn->cleanup_work, iscsi_cleanup_conn_work_fn);
2447         conn->transport = transport;
2448         conn->cid = cid;
2449         WRITE_ONCE(conn->state, ISCSI_CONN_DOWN);
2450
2451         /* this is released in the dev's release function */
2452         if (!get_device(&session->dev))
2453                 goto free_conn;
2454
2455         dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
2456         device_initialize(&conn->dev);
2457         conn->dev.parent = &session->dev;
2458         conn->dev.release = iscsi_conn_release;
2459
2460         return conn;
2461
2462 free_conn:
2463         kfree(conn);
2464         return NULL;
2465 }
2466 EXPORT_SYMBOL_GPL(iscsi_alloc_conn);
2467
2468 /**
2469  * iscsi_add_conn - add iscsi class connection
2470  * @conn: iscsi cls connection
2471  *
2472  * This will expose iscsi_cls_conn to sysfs so make sure the related
2473  * resources for sysfs attributes are initialized before calling this.
2474  */
2475 int iscsi_add_conn(struct iscsi_cls_conn *conn)
2476 {
2477         int err;
2478         unsigned long flags;
2479         struct iscsi_cls_session *session = iscsi_dev_to_session(conn->dev.parent);
2480
2481         err = device_add(&conn->dev);
2482         if (err) {
2483                 iscsi_cls_session_printk(KERN_ERR, session,
2484                                          "could not register connection's dev\n");
2485                 return err;
2486         }
2487         err = transport_register_device(&conn->dev);
2488         if (err) {
2489                 iscsi_cls_session_printk(KERN_ERR, session,
2490                                          "could not register transport's dev\n");
2491                 device_del(&conn->dev);
2492                 return err;
2493         }
2494
2495         spin_lock_irqsave(&connlock, flags);
2496         list_add(&conn->conn_list, &connlist);
2497         spin_unlock_irqrestore(&connlock, flags);
2498
2499         return 0;
2500 }
2501 EXPORT_SYMBOL_GPL(iscsi_add_conn);
2502
2503 /**
2504  * iscsi_remove_conn - remove iscsi class connection from sysfs
2505  * @conn: iscsi cls connection
2506  *
2507  * Remove iscsi_cls_conn from sysfs, and wait for previous
2508  * read/write of iscsi_cls_conn's attributes in sysfs to finish.
2509  */
2510 void iscsi_remove_conn(struct iscsi_cls_conn *conn)
2511 {
2512         unsigned long flags;
2513
2514         spin_lock_irqsave(&connlock, flags);
2515         list_del(&conn->conn_list);
2516         spin_unlock_irqrestore(&connlock, flags);
2517
2518         transport_unregister_device(&conn->dev);
2519         device_del(&conn->dev);
2520 }
2521 EXPORT_SYMBOL_GPL(iscsi_remove_conn);
2522
2523 void iscsi_put_conn(struct iscsi_cls_conn *conn)
2524 {
2525         put_device(&conn->dev);
2526 }
2527 EXPORT_SYMBOL_GPL(iscsi_put_conn);
2528
2529 void iscsi_get_conn(struct iscsi_cls_conn *conn)
2530 {
2531         get_device(&conn->dev);
2532 }
2533 EXPORT_SYMBOL_GPL(iscsi_get_conn);
2534
2535 /*
2536  * iscsi interface functions
2537  */
2538 static struct iscsi_internal *
2539 iscsi_if_transport_lookup(struct iscsi_transport *tt)
2540 {
2541         struct iscsi_internal *priv;
2542         unsigned long flags;
2543
2544         spin_lock_irqsave(&iscsi_transport_lock, flags);
2545         list_for_each_entry(priv, &iscsi_transports, list) {
2546                 if (tt == priv->iscsi_transport) {
2547                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2548                         return priv;
2549                 }
2550         }
2551         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2552         return NULL;
2553 }
2554
2555 static int
2556 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2557 {
2558         return nlmsg_multicast(nls, skb, 0, group, gfp);
2559 }
2560
2561 static int
2562 iscsi_unicast_skb(struct sk_buff *skb, u32 portid)
2563 {
2564         return nlmsg_unicast(nls, skb, portid);
2565 }
2566
2567 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2568                    char *data, uint32_t data_size)
2569 {
2570         struct nlmsghdr *nlh;
2571         struct sk_buff *skb;
2572         struct iscsi_uevent *ev;
2573         char *pdu;
2574         struct iscsi_internal *priv;
2575         int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2576                                    data_size);
2577
2578         priv = iscsi_if_transport_lookup(conn->transport);
2579         if (!priv)
2580                 return -EINVAL;
2581
2582         skb = alloc_skb(len, GFP_ATOMIC);
2583         if (!skb) {
2584                 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2585                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2586                                       "control PDU: OOM\n");
2587                 return -ENOMEM;
2588         }
2589
2590         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2591         ev = nlmsg_data(nlh);
2592         memset(ev, 0, sizeof(*ev));
2593         ev->transport_handle = iscsi_handle(conn->transport);
2594         ev->type = ISCSI_KEVENT_RECV_PDU;
2595         ev->r.recv_req.cid = conn->cid;
2596         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2597         pdu = (char*)ev + sizeof(*ev);
2598         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2599         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2600
2601         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2602 }
2603 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2604
2605 int iscsi_offload_mesg(struct Scsi_Host *shost,
2606                        struct iscsi_transport *transport, uint32_t type,
2607                        char *data, uint16_t data_size)
2608 {
2609         struct nlmsghdr *nlh;
2610         struct sk_buff *skb;
2611         struct iscsi_uevent *ev;
2612         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2613
2614         skb = alloc_skb(len, GFP_ATOMIC);
2615         if (!skb) {
2616                 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2617                 return -ENOMEM;
2618         }
2619
2620         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2621         ev = nlmsg_data(nlh);
2622         memset(ev, 0, sizeof(*ev));
2623         ev->type = type;
2624         ev->transport_handle = iscsi_handle(transport);
2625         switch (type) {
2626         case ISCSI_KEVENT_PATH_REQ:
2627                 ev->r.req_path.host_no = shost->host_no;
2628                 break;
2629         case ISCSI_KEVENT_IF_DOWN:
2630                 ev->r.notify_if_down.host_no = shost->host_no;
2631                 break;
2632         }
2633
2634         memcpy((char *)ev + sizeof(*ev), data, data_size);
2635
2636         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2637 }
2638 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2639
2640 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2641 {
2642         struct nlmsghdr *nlh;
2643         struct sk_buff  *skb;
2644         struct iscsi_uevent *ev;
2645         struct iscsi_internal *priv;
2646         int len = nlmsg_total_size(sizeof(*ev));
2647         unsigned long flags;
2648         int state;
2649
2650         spin_lock_irqsave(&conn->lock, flags);
2651         /*
2652          * Userspace will only do a stop call if we are at least bound. And, we
2653          * only need to do the in kernel cleanup if in the UP state so cmds can
2654          * be released to upper layers. If in other states just wait for
2655          * userspace to avoid races that can leave the cleanup_work queued.
2656          */
2657         state = READ_ONCE(conn->state);
2658         switch (state) {
2659         case ISCSI_CONN_BOUND:
2660         case ISCSI_CONN_UP:
2661                 if (!test_and_set_bit(ISCSI_CLS_CONN_BIT_CLEANUP,
2662                                       &conn->flags)) {
2663                         queue_work(iscsi_conn_cleanup_workq,
2664                                    &conn->cleanup_work);
2665                 }
2666                 break;
2667         default:
2668                 ISCSI_DBG_TRANS_CONN(conn, "Got conn error in state %d\n",
2669                                      state);
2670                 break;
2671         }
2672         spin_unlock_irqrestore(&conn->lock, flags);
2673
2674         priv = iscsi_if_transport_lookup(conn->transport);
2675         if (!priv)
2676                 return;
2677
2678         skb = alloc_skb(len, GFP_ATOMIC);
2679         if (!skb) {
2680                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2681                                       "conn error (%d)\n", error);
2682                 return;
2683         }
2684
2685         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2686         ev = nlmsg_data(nlh);
2687         ev->transport_handle = iscsi_handle(conn->transport);
2688         ev->type = ISCSI_KEVENT_CONN_ERROR;
2689         ev->r.connerror.error = error;
2690         ev->r.connerror.cid = conn->cid;
2691         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2692
2693         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2694
2695         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2696                               error);
2697 }
2698 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2699
2700 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2701                             enum iscsi_conn_state state)
2702 {
2703         struct nlmsghdr *nlh;
2704         struct sk_buff  *skb;
2705         struct iscsi_uevent *ev;
2706         struct iscsi_internal *priv;
2707         int len = nlmsg_total_size(sizeof(*ev));
2708
2709         priv = iscsi_if_transport_lookup(conn->transport);
2710         if (!priv)
2711                 return;
2712
2713         skb = alloc_skb(len, GFP_ATOMIC);
2714         if (!skb) {
2715                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2716                                       "conn login (%d)\n", state);
2717                 return;
2718         }
2719
2720         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2721         ev = nlmsg_data(nlh);
2722         ev->transport_handle = iscsi_handle(conn->transport);
2723         ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2724         ev->r.conn_login.state = state;
2725         ev->r.conn_login.cid = conn->cid;
2726         ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2727         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2728
2729         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2730                               state);
2731 }
2732 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2733
2734 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2735                            enum iscsi_host_event_code code, uint32_t data_size,
2736                            uint8_t *data)
2737 {
2738         struct nlmsghdr *nlh;
2739         struct sk_buff *skb;
2740         struct iscsi_uevent *ev;
2741         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2742
2743         skb = alloc_skb(len, GFP_NOIO);
2744         if (!skb) {
2745                 printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2746                        host_no, code);
2747                 return;
2748         }
2749
2750         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2751         ev = nlmsg_data(nlh);
2752         ev->transport_handle = iscsi_handle(transport);
2753         ev->type = ISCSI_KEVENT_HOST_EVENT;
2754         ev->r.host_event.host_no = host_no;
2755         ev->r.host_event.code = code;
2756         ev->r.host_event.data_size = data_size;
2757
2758         if (data_size)
2759                 memcpy((char *)ev + sizeof(*ev), data, data_size);
2760
2761         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2762 }
2763 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2764
2765 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2766                            uint32_t status, uint32_t pid, uint32_t data_size,
2767                            uint8_t *data)
2768 {
2769         struct nlmsghdr *nlh;
2770         struct sk_buff *skb;
2771         struct iscsi_uevent *ev;
2772         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2773
2774         skb = alloc_skb(len, GFP_NOIO);
2775         if (!skb) {
2776                 printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2777                 return;
2778         }
2779
2780         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2781         ev = nlmsg_data(nlh);
2782         ev->transport_handle = iscsi_handle(transport);
2783         ev->type = ISCSI_KEVENT_PING_COMP;
2784         ev->r.ping_comp.host_no = host_no;
2785         ev->r.ping_comp.status = status;
2786         ev->r.ping_comp.pid = pid;
2787         ev->r.ping_comp.data_size = data_size;
2788         memcpy((char *)ev + sizeof(*ev), data, data_size);
2789
2790         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2791 }
2792 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2793
2794 static int
2795 iscsi_if_send_reply(u32 portid, int type, void *payload, int size)
2796 {
2797         struct sk_buff  *skb;
2798         struct nlmsghdr *nlh;
2799         int len = nlmsg_total_size(size);
2800
2801         skb = alloc_skb(len, GFP_ATOMIC);
2802         if (!skb) {
2803                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
2804                 return -ENOMEM;
2805         }
2806
2807         nlh = __nlmsg_put(skb, 0, 0, type, (len - sizeof(*nlh)), 0);
2808         memcpy(nlmsg_data(nlh), payload, size);
2809         return iscsi_unicast_skb(skb, portid);
2810 }
2811
2812 static int
2813 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2814 {
2815         struct iscsi_uevent *ev = nlmsg_data(nlh);
2816         struct iscsi_stats *stats;
2817         struct sk_buff *skbstat;
2818         struct iscsi_cls_conn *conn;
2819         struct nlmsghdr *nlhstat;
2820         struct iscsi_uevent *evstat;
2821         struct iscsi_internal *priv;
2822         int len = nlmsg_total_size(sizeof(*ev) +
2823                                    sizeof(struct iscsi_stats) +
2824                                    sizeof(struct iscsi_stats_custom) *
2825                                    ISCSI_STATS_CUSTOM_MAX);
2826         int err = 0;
2827
2828         priv = iscsi_if_transport_lookup(transport);
2829         if (!priv)
2830                 return -EINVAL;
2831
2832         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2833         if (!conn)
2834                 return -EEXIST;
2835
2836         do {
2837                 int actual_size;
2838
2839                 skbstat = alloc_skb(len, GFP_ATOMIC);
2840                 if (!skbstat) {
2841                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2842                                               "deliver stats: OOM\n");
2843                         return -ENOMEM;
2844                 }
2845
2846                 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2847                                       (len - sizeof(*nlhstat)), 0);
2848                 evstat = nlmsg_data(nlhstat);
2849                 memset(evstat, 0, sizeof(*evstat));
2850                 evstat->transport_handle = iscsi_handle(conn->transport);
2851                 evstat->type = nlh->nlmsg_type;
2852                 evstat->u.get_stats.cid =
2853                         ev->u.get_stats.cid;
2854                 evstat->u.get_stats.sid =
2855                         ev->u.get_stats.sid;
2856                 stats = (struct iscsi_stats *)
2857                         ((char*)evstat + sizeof(*evstat));
2858                 memset(stats, 0, sizeof(*stats));
2859
2860                 transport->get_stats(conn, stats);
2861                 actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2862                                                sizeof(struct iscsi_stats) +
2863                                                sizeof(struct iscsi_stats_custom) *
2864                                                stats->custom_length);
2865                 actual_size -= sizeof(*nlhstat);
2866                 actual_size = nlmsg_msg_size(actual_size);
2867                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2868                 nlhstat->nlmsg_len = actual_size;
2869
2870                 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2871                                           GFP_ATOMIC);
2872         } while (err < 0 && err != -ECONNREFUSED);
2873
2874         return err;
2875 }
2876
2877 /**
2878  * iscsi_session_event - send session destr. completion event
2879  * @session: iscsi class session
2880  * @event: type of event
2881  */
2882 int iscsi_session_event(struct iscsi_cls_session *session,
2883                         enum iscsi_uevent_e event)
2884 {
2885         struct iscsi_internal *priv;
2886         struct Scsi_Host *shost;
2887         struct iscsi_uevent *ev;
2888         struct sk_buff  *skb;
2889         struct nlmsghdr *nlh;
2890         int rc, len = nlmsg_total_size(sizeof(*ev));
2891
2892         priv = iscsi_if_transport_lookup(session->transport);
2893         if (!priv)
2894                 return -EINVAL;
2895         shost = iscsi_session_to_shost(session);
2896
2897         skb = alloc_skb(len, GFP_KERNEL);
2898         if (!skb) {
2899                 iscsi_cls_session_printk(KERN_ERR, session,
2900                                          "Cannot notify userspace of session "
2901                                          "event %u\n", event);
2902                 return -ENOMEM;
2903         }
2904
2905         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2906         ev = nlmsg_data(nlh);
2907         ev->transport_handle = iscsi_handle(session->transport);
2908
2909         ev->type = event;
2910         switch (event) {
2911         case ISCSI_KEVENT_DESTROY_SESSION:
2912                 ev->r.d_session.host_no = shost->host_no;
2913                 ev->r.d_session.sid = session->sid;
2914                 break;
2915         case ISCSI_KEVENT_CREATE_SESSION:
2916                 ev->r.c_session_ret.host_no = shost->host_no;
2917                 ev->r.c_session_ret.sid = session->sid;
2918                 break;
2919         case ISCSI_KEVENT_UNBIND_SESSION:
2920                 ev->r.unbind_session.host_no = shost->host_no;
2921                 ev->r.unbind_session.sid = session->sid;
2922                 break;
2923         default:
2924                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2925                                          "%u.\n", event);
2926                 kfree_skb(skb);
2927                 return -EINVAL;
2928         }
2929
2930         /*
2931          * this will occur if the daemon is not up, so we just warn
2932          * the user and when the daemon is restarted it will handle it
2933          */
2934         rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2935         if (rc == -ESRCH)
2936                 iscsi_cls_session_printk(KERN_ERR, session,
2937                                          "Cannot notify userspace of session "
2938                                          "event %u. Check iscsi daemon\n",
2939                                          event);
2940
2941         ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2942                                 event, rc);
2943         return rc;
2944 }
2945 EXPORT_SYMBOL_GPL(iscsi_session_event);
2946
2947 static int
2948 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2949                         struct iscsi_uevent *ev, pid_t pid,
2950                         uint32_t initial_cmdsn, uint16_t cmds_max,
2951                         uint16_t queue_depth)
2952 {
2953         struct iscsi_transport *transport = priv->iscsi_transport;
2954         struct iscsi_cls_session *session;
2955         struct Scsi_Host *shost;
2956
2957         session = transport->create_session(ep, cmds_max, queue_depth,
2958                                             initial_cmdsn);
2959         if (!session)
2960                 return -ENOMEM;
2961
2962         session->creator = pid;
2963         shost = iscsi_session_to_shost(session);
2964         ev->r.c_session_ret.host_no = shost->host_no;
2965         ev->r.c_session_ret.sid = session->sid;
2966         ISCSI_DBG_TRANS_SESSION(session,
2967                                 "Completed creating transport session\n");
2968         return 0;
2969 }
2970
2971 static int
2972 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2973 {
2974         struct iscsi_cls_conn *conn;
2975         struct iscsi_cls_session *session;
2976
2977         session = iscsi_session_lookup(ev->u.c_conn.sid);
2978         if (!session) {
2979                 printk(KERN_ERR "iscsi: invalid session %d.\n",
2980                        ev->u.c_conn.sid);
2981                 return -EINVAL;
2982         }
2983
2984         conn = transport->create_conn(session, ev->u.c_conn.cid);
2985         if (!conn) {
2986                 iscsi_cls_session_printk(KERN_ERR, session,
2987                                          "couldn't create a new connection.");
2988                 return -ENOMEM;
2989         }
2990
2991         ev->r.c_conn_ret.sid = session->sid;
2992         ev->r.c_conn_ret.cid = conn->cid;
2993
2994         ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2995         return 0;
2996 }
2997
2998 static int
2999 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
3000 {
3001         struct iscsi_cls_conn *conn;
3002
3003         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
3004         if (!conn)
3005                 return -EINVAL;
3006
3007         ISCSI_DBG_TRANS_CONN(conn, "Flushing cleanup during destruction\n");
3008         flush_work(&conn->cleanup_work);
3009         ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
3010
3011         if (transport->destroy_conn)
3012                 transport->destroy_conn(conn);
3013         return 0;
3014 }
3015
3016 static int
3017 iscsi_if_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev, u32 rlen)
3018 {
3019         char *data = (char*)ev + sizeof(*ev);
3020         struct iscsi_cls_conn *conn;
3021         struct iscsi_cls_session *session;
3022         int err = 0, value = 0, state;
3023
3024         if (ev->u.set_param.len > rlen ||
3025             ev->u.set_param.len > PAGE_SIZE)
3026                 return -EINVAL;
3027
3028         session = iscsi_session_lookup(ev->u.set_param.sid);
3029         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
3030         if (!conn || !session)
3031                 return -EINVAL;
3032
3033         /* data will be regarded as NULL-ended string, do length check */
3034         if (strlen(data) > ev->u.set_param.len)
3035                 return -EINVAL;
3036
3037         switch (ev->u.set_param.param) {
3038         case ISCSI_PARAM_SESS_RECOVERY_TMO:
3039                 sscanf(data, "%d", &value);
3040                 if (!session->recovery_tmo_sysfs_override)
3041                         session->recovery_tmo = value;
3042                 break;
3043         default:
3044                 state = READ_ONCE(conn->state);
3045                 if (state == ISCSI_CONN_BOUND || state == ISCSI_CONN_UP) {
3046                         err = transport->set_param(conn, ev->u.set_param.param,
3047                                         data, ev->u.set_param.len);
3048                 } else {
3049                         return -ENOTCONN;
3050                 }
3051         }
3052
3053         return err;
3054 }
3055
3056 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
3057                                struct iscsi_uevent *ev, int msg_type)
3058 {
3059         struct iscsi_endpoint *ep;
3060         struct sockaddr *dst_addr;
3061         struct Scsi_Host *shost = NULL;
3062         int non_blocking, err = 0;
3063
3064         if (!transport->ep_connect)
3065                 return -EINVAL;
3066
3067         if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
3068                 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
3069                 if (!shost) {
3070                         printk(KERN_ERR "ep connect failed. Could not find "
3071                                "host no %u\n",
3072                                ev->u.ep_connect_through_host.host_no);
3073                         return -ENODEV;
3074                 }
3075                 non_blocking = ev->u.ep_connect_through_host.non_blocking;
3076         } else
3077                 non_blocking = ev->u.ep_connect.non_blocking;
3078
3079         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
3080         ep = transport->ep_connect(shost, dst_addr, non_blocking);
3081         if (IS_ERR(ep)) {
3082                 err = PTR_ERR(ep);
3083                 goto release_host;
3084         }
3085
3086         ev->r.ep_connect_ret.handle = ep->id;
3087 release_host:
3088         if (shost)
3089                 scsi_host_put(shost);
3090         return err;
3091 }
3092
3093 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
3094                                   u64 ep_handle)
3095 {
3096         struct iscsi_cls_conn *conn;
3097         struct iscsi_endpoint *ep;
3098
3099         if (!transport->ep_disconnect)
3100                 return -EINVAL;
3101
3102         ep = iscsi_lookup_endpoint(ep_handle);
3103         if (!ep)
3104                 return -EINVAL;
3105
3106         conn = ep->conn;
3107         if (!conn) {
3108                 /*
3109                  * conn was not even bound yet, so we can't get iscsi conn
3110                  * failures yet.
3111                  */
3112                 transport->ep_disconnect(ep);
3113                 goto put_ep;
3114         }
3115
3116         mutex_lock(&conn->ep_mutex);
3117         iscsi_if_disconnect_bound_ep(conn, ep, false);
3118         mutex_unlock(&conn->ep_mutex);
3119 put_ep:
3120         iscsi_put_endpoint(ep);
3121         return 0;
3122 }
3123
3124 static int
3125 iscsi_if_transport_ep(struct iscsi_transport *transport,
3126                       struct iscsi_uevent *ev, int msg_type, u32 rlen)
3127 {
3128         struct iscsi_endpoint *ep;
3129         int rc = 0;
3130
3131         switch (msg_type) {
3132         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3133         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3134                 if (rlen < sizeof(struct sockaddr))
3135                         rc = -EINVAL;
3136                 else
3137                         rc = iscsi_if_ep_connect(transport, ev, msg_type);
3138                 break;
3139         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3140                 if (!transport->ep_poll)
3141                         return -EINVAL;
3142
3143                 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
3144                 if (!ep)
3145                         return -EINVAL;
3146
3147                 ev->r.retcode = transport->ep_poll(ep,
3148                                                    ev->u.ep_poll.timeout_ms);
3149                 iscsi_put_endpoint(ep);
3150                 break;
3151         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3152                 rc = iscsi_if_ep_disconnect(transport,
3153                                             ev->u.ep_disconnect.ep_handle);
3154                 break;
3155         }
3156         return rc;
3157 }
3158
3159 static int
3160 iscsi_tgt_dscvr(struct iscsi_transport *transport,
3161                 struct iscsi_uevent *ev, u32 rlen)
3162 {
3163         struct Scsi_Host *shost;
3164         struct sockaddr *dst_addr;
3165         int err;
3166
3167         if (rlen < sizeof(*dst_addr))
3168                 return -EINVAL;
3169
3170         if (!transport->tgt_dscvr)
3171                 return -EINVAL;
3172
3173         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
3174         if (!shost) {
3175                 printk(KERN_ERR "target discovery could not find host no %u\n",
3176                        ev->u.tgt_dscvr.host_no);
3177                 return -ENODEV;
3178         }
3179
3180
3181         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
3182         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
3183                                    ev->u.tgt_dscvr.enable, dst_addr);
3184         scsi_host_put(shost);
3185         return err;
3186 }
3187
3188 static int
3189 iscsi_set_host_param(struct iscsi_transport *transport,
3190                      struct iscsi_uevent *ev, u32 rlen)
3191 {
3192         char *data = (char*)ev + sizeof(*ev);
3193         struct Scsi_Host *shost;
3194         int err;
3195
3196         if (!transport->set_host_param)
3197                 return -ENOSYS;
3198
3199         if (ev->u.set_host_param.len > rlen ||
3200             ev->u.set_host_param.len > PAGE_SIZE)
3201                 return -EINVAL;
3202
3203         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
3204         if (!shost) {
3205                 printk(KERN_ERR "set_host_param could not find host no %u\n",
3206                        ev->u.set_host_param.host_no);
3207                 return -ENODEV;
3208         }
3209
3210         /* see similar check in iscsi_if_set_param() */
3211         if (strlen(data) > ev->u.set_host_param.len)
3212                 return -EINVAL;
3213
3214         err = transport->set_host_param(shost, ev->u.set_host_param.param,
3215                                         data, ev->u.set_host_param.len);
3216         scsi_host_put(shost);
3217         return err;
3218 }
3219
3220 static int
3221 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev, u32 rlen)
3222 {
3223         struct Scsi_Host *shost;
3224         struct iscsi_path *params;
3225         int err;
3226
3227         if (rlen < sizeof(*params))
3228                 return -EINVAL;
3229
3230         if (!transport->set_path)
3231                 return -ENOSYS;
3232
3233         shost = scsi_host_lookup(ev->u.set_path.host_no);
3234         if (!shost) {
3235                 printk(KERN_ERR "set path could not find host no %u\n",
3236                        ev->u.set_path.host_no);
3237                 return -ENODEV;
3238         }
3239
3240         params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
3241         err = transport->set_path(shost, params);
3242
3243         scsi_host_put(shost);
3244         return err;
3245 }
3246
3247 static int iscsi_session_has_conns(int sid)
3248 {
3249         struct iscsi_cls_conn *conn;
3250         unsigned long flags;
3251         int found = 0;
3252
3253         spin_lock_irqsave(&connlock, flags);
3254         list_for_each_entry(conn, &connlist, conn_list) {
3255                 if (iscsi_conn_get_sid(conn) == sid) {
3256                         found = 1;
3257                         break;
3258                 }
3259         }
3260         spin_unlock_irqrestore(&connlock, flags);
3261
3262         return found;
3263 }
3264
3265 static int
3266 iscsi_set_iface_params(struct iscsi_transport *transport,
3267                        struct iscsi_uevent *ev, uint32_t len)
3268 {
3269         char *data = (char *)ev + sizeof(*ev);
3270         struct Scsi_Host *shost;
3271         int err;
3272
3273         if (!transport->set_iface_param)
3274                 return -ENOSYS;
3275
3276         shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
3277         if (!shost) {
3278                 printk(KERN_ERR "set_iface_params could not find host no %u\n",
3279                        ev->u.set_iface_params.host_no);
3280                 return -ENODEV;
3281         }
3282
3283         err = transport->set_iface_param(shost, data, len);
3284         scsi_host_put(shost);
3285         return err;
3286 }
3287
3288 static int
3289 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev, u32 rlen)
3290 {
3291         struct Scsi_Host *shost;
3292         struct sockaddr *dst_addr;
3293         int err;
3294
3295         if (rlen < sizeof(*dst_addr))
3296                 return -EINVAL;
3297
3298         if (!transport->send_ping)
3299                 return -ENOSYS;
3300
3301         shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
3302         if (!shost) {
3303                 printk(KERN_ERR "iscsi_ping could not find host no %u\n",
3304                        ev->u.iscsi_ping.host_no);
3305                 return -ENODEV;
3306         }
3307
3308         dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
3309         err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
3310                                    ev->u.iscsi_ping.iface_type,
3311                                    ev->u.iscsi_ping.payload_size,
3312                                    ev->u.iscsi_ping.pid,
3313                                    dst_addr);
3314         scsi_host_put(shost);
3315         return err;
3316 }
3317
3318 static int
3319 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3320 {
3321         struct iscsi_uevent *ev = nlmsg_data(nlh);
3322         struct Scsi_Host *shost = NULL;
3323         struct iscsi_chap_rec *chap_rec;
3324         struct iscsi_internal *priv;
3325         struct sk_buff *skbchap;
3326         struct nlmsghdr *nlhchap;
3327         struct iscsi_uevent *evchap;
3328         uint32_t chap_buf_size;
3329         int len, err = 0;
3330         char *buf;
3331
3332         if (!transport->get_chap)
3333                 return -EINVAL;
3334
3335         priv = iscsi_if_transport_lookup(transport);
3336         if (!priv)
3337                 return -EINVAL;
3338
3339         chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
3340         len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3341
3342         shost = scsi_host_lookup(ev->u.get_chap.host_no);
3343         if (!shost) {
3344                 printk(KERN_ERR "%s: failed. Could not find host no %u\n",
3345                        __func__, ev->u.get_chap.host_no);
3346                 return -ENODEV;
3347         }
3348
3349         do {
3350                 int actual_size;
3351
3352                 skbchap = alloc_skb(len, GFP_KERNEL);
3353                 if (!skbchap) {
3354                         printk(KERN_ERR "can not deliver chap: OOM\n");
3355                         err = -ENOMEM;
3356                         goto exit_get_chap;
3357                 }
3358
3359                 nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
3360                                       (len - sizeof(*nlhchap)), 0);
3361                 evchap = nlmsg_data(nlhchap);
3362                 memset(evchap, 0, sizeof(*evchap));
3363                 evchap->transport_handle = iscsi_handle(transport);
3364                 evchap->type = nlh->nlmsg_type;
3365                 evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
3366                 evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
3367                 evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
3368                 buf = (char *)evchap + sizeof(*evchap);
3369                 memset(buf, 0, chap_buf_size);
3370
3371                 err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
3372                                     &evchap->u.get_chap.num_entries, buf);
3373
3374                 actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3375                 skb_trim(skbchap, NLMSG_ALIGN(actual_size));
3376                 nlhchap->nlmsg_len = actual_size;
3377
3378                 err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
3379                                           GFP_KERNEL);
3380         } while (err < 0 && err != -ECONNREFUSED);
3381
3382 exit_get_chap:
3383         scsi_host_put(shost);
3384         return err;
3385 }
3386
3387 static int iscsi_set_chap(struct iscsi_transport *transport,
3388                           struct iscsi_uevent *ev, uint32_t len)
3389 {
3390         char *data = (char *)ev + sizeof(*ev);
3391         struct Scsi_Host *shost;
3392         int err = 0;
3393
3394         if (!transport->set_chap)
3395                 return -ENOSYS;
3396
3397         shost = scsi_host_lookup(ev->u.set_path.host_no);
3398         if (!shost) {
3399                 pr_err("%s could not find host no %u\n",
3400                        __func__, ev->u.set_path.host_no);
3401                 return -ENODEV;
3402         }
3403
3404         err = transport->set_chap(shost, data, len);
3405         scsi_host_put(shost);
3406         return err;
3407 }
3408
3409 static int iscsi_delete_chap(struct iscsi_transport *transport,
3410                              struct iscsi_uevent *ev)
3411 {
3412         struct Scsi_Host *shost;
3413         int err = 0;
3414
3415         if (!transport->delete_chap)
3416                 return -ENOSYS;
3417
3418         shost = scsi_host_lookup(ev->u.delete_chap.host_no);
3419         if (!shost) {
3420                 printk(KERN_ERR "%s could not find host no %u\n",
3421                        __func__, ev->u.delete_chap.host_no);
3422                 return -ENODEV;
3423         }
3424
3425         err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
3426         scsi_host_put(shost);
3427         return err;
3428 }
3429
3430 static const struct {
3431         enum iscsi_discovery_parent_type value;
3432         char                            *name;
3433 } iscsi_discovery_parent_names[] = {
3434         {ISCSI_DISC_PARENT_UNKNOWN,     "Unknown" },
3435         {ISCSI_DISC_PARENT_SENDTGT,     "Sendtarget" },
3436         {ISCSI_DISC_PARENT_ISNS,        "isns" },
3437 };
3438
3439 char *iscsi_get_discovery_parent_name(int parent_type)
3440 {
3441         int i;
3442         char *state = "Unknown!";
3443
3444         for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
3445                 if (iscsi_discovery_parent_names[i].value & parent_type) {
3446                         state = iscsi_discovery_parent_names[i].name;
3447                         break;
3448                 }
3449         }
3450         return state;
3451 }
3452 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3453
3454 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
3455                                      struct iscsi_uevent *ev, uint32_t len)
3456 {
3457         char *data = (char *)ev + sizeof(*ev);
3458         struct Scsi_Host *shost;
3459         struct iscsi_bus_flash_session *fnode_sess;
3460         struct iscsi_bus_flash_conn *fnode_conn;
3461         struct device *dev;
3462         uint32_t idx;
3463         int err = 0;
3464
3465         if (!transport->set_flashnode_param) {
3466                 err = -ENOSYS;
3467                 goto exit_set_fnode;
3468         }
3469
3470         shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
3471         if (!shost) {
3472                 pr_err("%s could not find host no %u\n",
3473                        __func__, ev->u.set_flashnode.host_no);
3474                 err = -ENODEV;
3475                 goto exit_set_fnode;
3476         }
3477
3478         idx = ev->u.set_flashnode.flashnode_idx;
3479         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3480         if (!fnode_sess) {
3481                 pr_err("%s could not find flashnode %u for host no %u\n",
3482                        __func__, idx, ev->u.set_flashnode.host_no);
3483                 err = -ENODEV;
3484                 goto put_host;
3485         }
3486
3487         dev = iscsi_find_flashnode_conn(fnode_sess);
3488         if (!dev) {
3489                 err = -ENODEV;
3490                 goto put_sess;
3491         }
3492
3493         fnode_conn = iscsi_dev_to_flash_conn(dev);
3494         err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
3495         put_device(dev);
3496
3497 put_sess:
3498         put_device(&fnode_sess->dev);
3499
3500 put_host:
3501         scsi_host_put(shost);
3502
3503 exit_set_fnode:
3504         return err;
3505 }
3506
3507 static int iscsi_new_flashnode(struct iscsi_transport *transport,
3508                                struct iscsi_uevent *ev, uint32_t len)
3509 {
3510         char *data = (char *)ev + sizeof(*ev);
3511         struct Scsi_Host *shost;
3512         int index;
3513         int err = 0;
3514
3515         if (!transport->new_flashnode) {
3516                 err = -ENOSYS;
3517                 goto exit_new_fnode;
3518         }
3519
3520         shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
3521         if (!shost) {
3522                 pr_err("%s could not find host no %u\n",
3523                        __func__, ev->u.new_flashnode.host_no);
3524                 err = -ENODEV;
3525                 goto put_host;
3526         }
3527
3528         index = transport->new_flashnode(shost, data, len);
3529
3530         if (index >= 0)
3531                 ev->r.new_flashnode_ret.flashnode_idx = index;
3532         else
3533                 err = -EIO;
3534
3535 put_host:
3536         scsi_host_put(shost);
3537
3538 exit_new_fnode:
3539         return err;
3540 }
3541
3542 static int iscsi_del_flashnode(struct iscsi_transport *transport,
3543                                struct iscsi_uevent *ev)
3544 {
3545         struct Scsi_Host *shost;
3546         struct iscsi_bus_flash_session *fnode_sess;
3547         uint32_t idx;
3548         int err = 0;
3549
3550         if (!transport->del_flashnode) {
3551                 err = -ENOSYS;
3552                 goto exit_del_fnode;
3553         }
3554
3555         shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
3556         if (!shost) {
3557                 pr_err("%s could not find host no %u\n",
3558                        __func__, ev->u.del_flashnode.host_no);
3559                 err = -ENODEV;
3560                 goto put_host;
3561         }
3562
3563         idx = ev->u.del_flashnode.flashnode_idx;
3564         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3565         if (!fnode_sess) {
3566                 pr_err("%s could not find flashnode %u for host no %u\n",
3567                        __func__, idx, ev->u.del_flashnode.host_no);
3568                 err = -ENODEV;
3569                 goto put_host;
3570         }
3571
3572         err = transport->del_flashnode(fnode_sess);
3573         put_device(&fnode_sess->dev);
3574
3575 put_host:
3576         scsi_host_put(shost);
3577
3578 exit_del_fnode:
3579         return err;
3580 }
3581
3582 static int iscsi_login_flashnode(struct iscsi_transport *transport,
3583                                  struct iscsi_uevent *ev)
3584 {
3585         struct Scsi_Host *shost;
3586         struct iscsi_bus_flash_session *fnode_sess;
3587         struct iscsi_bus_flash_conn *fnode_conn;
3588         struct device *dev;
3589         uint32_t idx;
3590         int err = 0;
3591
3592         if (!transport->login_flashnode) {
3593                 err = -ENOSYS;
3594                 goto exit_login_fnode;
3595         }
3596
3597         shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
3598         if (!shost) {
3599                 pr_err("%s could not find host no %u\n",
3600                        __func__, ev->u.login_flashnode.host_no);
3601                 err = -ENODEV;
3602                 goto put_host;
3603         }
3604
3605         idx = ev->u.login_flashnode.flashnode_idx;
3606         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3607         if (!fnode_sess) {
3608                 pr_err("%s could not find flashnode %u for host no %u\n",
3609                        __func__, idx, ev->u.login_flashnode.host_no);
3610                 err = -ENODEV;
3611                 goto put_host;
3612         }
3613
3614         dev = iscsi_find_flashnode_conn(fnode_sess);
3615         if (!dev) {
3616                 err = -ENODEV;
3617                 goto put_sess;
3618         }
3619
3620         fnode_conn = iscsi_dev_to_flash_conn(dev);
3621         err = transport->login_flashnode(fnode_sess, fnode_conn);
3622         put_device(dev);
3623
3624 put_sess:
3625         put_device(&fnode_sess->dev);
3626
3627 put_host:
3628         scsi_host_put(shost);
3629
3630 exit_login_fnode:
3631         return err;
3632 }
3633
3634 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
3635                                   struct iscsi_uevent *ev)
3636 {
3637         struct Scsi_Host *shost;
3638         struct iscsi_bus_flash_session *fnode_sess;
3639         struct iscsi_bus_flash_conn *fnode_conn;
3640         struct device *dev;
3641         uint32_t idx;
3642         int err = 0;
3643
3644         if (!transport->logout_flashnode) {
3645                 err = -ENOSYS;
3646                 goto exit_logout_fnode;
3647         }
3648
3649         shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
3650         if (!shost) {
3651                 pr_err("%s could not find host no %u\n",
3652                        __func__, ev->u.logout_flashnode.host_no);
3653                 err = -ENODEV;
3654                 goto put_host;
3655         }
3656
3657         idx = ev->u.logout_flashnode.flashnode_idx;
3658         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3659         if (!fnode_sess) {
3660                 pr_err("%s could not find flashnode %u for host no %u\n",
3661                        __func__, idx, ev->u.logout_flashnode.host_no);
3662                 err = -ENODEV;
3663                 goto put_host;
3664         }
3665
3666         dev = iscsi_find_flashnode_conn(fnode_sess);
3667         if (!dev) {
3668                 err = -ENODEV;
3669                 goto put_sess;
3670         }
3671
3672         fnode_conn = iscsi_dev_to_flash_conn(dev);
3673
3674         err = transport->logout_flashnode(fnode_sess, fnode_conn);
3675         put_device(dev);
3676
3677 put_sess:
3678         put_device(&fnode_sess->dev);
3679
3680 put_host:
3681         scsi_host_put(shost);
3682
3683 exit_logout_fnode:
3684         return err;
3685 }
3686
3687 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3688                                       struct iscsi_uevent *ev)
3689 {
3690         struct Scsi_Host *shost;
3691         struct iscsi_cls_session *session;
3692         int err = 0;
3693
3694         if (!transport->logout_flashnode_sid) {
3695                 err = -ENOSYS;
3696                 goto exit_logout_sid;
3697         }
3698
3699         shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3700         if (!shost) {
3701                 pr_err("%s could not find host no %u\n",
3702                        __func__, ev->u.logout_flashnode.host_no);
3703                 err = -ENODEV;
3704                 goto put_host;
3705         }
3706
3707         session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3708         if (!session) {
3709                 pr_err("%s could not find session id %u\n",
3710                        __func__, ev->u.logout_flashnode_sid.sid);
3711                 err = -EINVAL;
3712                 goto put_host;
3713         }
3714
3715         err = transport->logout_flashnode_sid(session);
3716
3717 put_host:
3718         scsi_host_put(shost);
3719
3720 exit_logout_sid:
3721         return err;
3722 }
3723
3724 static int
3725 iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3726 {
3727         struct iscsi_uevent *ev = nlmsg_data(nlh);
3728         struct Scsi_Host *shost = NULL;
3729         struct iscsi_internal *priv;
3730         struct sk_buff *skbhost_stats;
3731         struct nlmsghdr *nlhhost_stats;
3732         struct iscsi_uevent *evhost_stats;
3733         int host_stats_size = 0;
3734         int len, err = 0;
3735         char *buf;
3736
3737         if (!transport->get_host_stats)
3738                 return -ENOSYS;
3739
3740         priv = iscsi_if_transport_lookup(transport);
3741         if (!priv)
3742                 return -EINVAL;
3743
3744         host_stats_size = sizeof(struct iscsi_offload_host_stats);
3745         len = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3746
3747         shost = scsi_host_lookup(ev->u.get_host_stats.host_no);
3748         if (!shost) {
3749                 pr_err("%s: failed. Could not find host no %u\n",
3750                        __func__, ev->u.get_host_stats.host_no);
3751                 return -ENODEV;
3752         }
3753
3754         do {
3755                 int actual_size;
3756
3757                 skbhost_stats = alloc_skb(len, GFP_KERNEL);
3758                 if (!skbhost_stats) {
3759                         pr_err("cannot deliver host stats: OOM\n");
3760                         err = -ENOMEM;
3761                         goto exit_host_stats;
3762                 }
3763
3764                 nlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,
3765                                       (len - sizeof(*nlhhost_stats)), 0);
3766                 evhost_stats = nlmsg_data(nlhhost_stats);
3767                 memset(evhost_stats, 0, sizeof(*evhost_stats));
3768                 evhost_stats->transport_handle = iscsi_handle(transport);
3769                 evhost_stats->type = nlh->nlmsg_type;
3770                 evhost_stats->u.get_host_stats.host_no =
3771                                         ev->u.get_host_stats.host_no;
3772                 buf = (char *)evhost_stats + sizeof(*evhost_stats);
3773                 memset(buf, 0, host_stats_size);
3774
3775                 err = transport->get_host_stats(shost, buf, host_stats_size);
3776                 if (err) {
3777                         kfree_skb(skbhost_stats);
3778                         goto exit_host_stats;
3779                 }
3780
3781                 actual_size = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3782                 skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
3783                 nlhhost_stats->nlmsg_len = actual_size;
3784
3785                 err = iscsi_multicast_skb(skbhost_stats, ISCSI_NL_GRP_ISCSID,
3786                                           GFP_KERNEL);
3787         } while (err < 0 && err != -ECONNREFUSED);
3788
3789 exit_host_stats:
3790         scsi_host_put(shost);
3791         return err;
3792 }
3793
3794 static int iscsi_if_transport_conn(struct iscsi_transport *transport,
3795                                    struct nlmsghdr *nlh, u32 pdu_len)
3796 {
3797         struct iscsi_uevent *ev = nlmsg_data(nlh);
3798         struct iscsi_cls_session *session;
3799         struct iscsi_cls_conn *conn = NULL;
3800         struct iscsi_endpoint *ep;
3801         int err = 0;
3802
3803         switch (nlh->nlmsg_type) {
3804         case ISCSI_UEVENT_CREATE_CONN:
3805                 return iscsi_if_create_conn(transport, ev);
3806         case ISCSI_UEVENT_DESTROY_CONN:
3807                 return iscsi_if_destroy_conn(transport, ev);
3808         case ISCSI_UEVENT_STOP_CONN:
3809                 conn = iscsi_conn_lookup(ev->u.stop_conn.sid,
3810                                          ev->u.stop_conn.cid);
3811                 if (!conn)
3812                         return -EINVAL;
3813
3814                 return iscsi_if_stop_conn(conn, ev->u.stop_conn.flag);
3815         }
3816
3817         /*
3818          * The following cmds need to be run under the ep_mutex so in kernel
3819          * conn cleanup (ep_disconnect + unbind and conn) is not done while
3820          * these are running. They also must not run if we have just run a conn
3821          * cleanup because they would set the state in a way that might allow
3822          * IO or send IO themselves.
3823          */
3824         switch (nlh->nlmsg_type) {
3825         case ISCSI_UEVENT_START_CONN:
3826                 conn = iscsi_conn_lookup(ev->u.start_conn.sid,
3827                                          ev->u.start_conn.cid);
3828                 break;
3829         case ISCSI_UEVENT_BIND_CONN:
3830                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3831                 break;
3832         case ISCSI_UEVENT_SEND_PDU:
3833                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3834                 break;
3835         }
3836
3837         if (!conn)
3838                 return -EINVAL;
3839
3840         mutex_lock(&conn->ep_mutex);
3841         spin_lock_irq(&conn->lock);
3842         if (test_bit(ISCSI_CLS_CONN_BIT_CLEANUP, &conn->flags)) {
3843                 spin_unlock_irq(&conn->lock);
3844                 mutex_unlock(&conn->ep_mutex);
3845                 ev->r.retcode = -ENOTCONN;
3846                 return 0;
3847         }
3848         spin_unlock_irq(&conn->lock);
3849
3850         switch (nlh->nlmsg_type) {
3851         case ISCSI_UEVENT_BIND_CONN:
3852                 session = iscsi_session_lookup(ev->u.b_conn.sid);
3853                 if (!session) {
3854                         err = -EINVAL;
3855                         break;
3856                 }
3857
3858                 ev->r.retcode = transport->bind_conn(session, conn,
3859                                                 ev->u.b_conn.transport_eph,
3860                                                 ev->u.b_conn.is_leading);
3861                 if (!ev->r.retcode)
3862                         WRITE_ONCE(conn->state, ISCSI_CONN_BOUND);
3863
3864                 if (ev->r.retcode || !transport->ep_connect)
3865                         break;
3866
3867                 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3868                 if (ep) {
3869                         ep->conn = conn;
3870                         conn->ep = ep;
3871                         iscsi_put_endpoint(ep);
3872                 } else {
3873                         err = -ENOTCONN;
3874                         iscsi_cls_conn_printk(KERN_ERR, conn,
3875                                               "Could not set ep conn binding\n");
3876                 }
3877                 break;
3878         case ISCSI_UEVENT_START_CONN:
3879                 ev->r.retcode = transport->start_conn(conn);
3880                 if (!ev->r.retcode)
3881                         WRITE_ONCE(conn->state, ISCSI_CONN_UP);
3882
3883                 break;
3884         case ISCSI_UEVENT_SEND_PDU:
3885                 if ((ev->u.send_pdu.hdr_size > pdu_len) ||
3886                     (ev->u.send_pdu.data_size > (pdu_len - ev->u.send_pdu.hdr_size))) {
3887                         err = -EINVAL;
3888                         break;
3889                 }
3890
3891                 ev->r.retcode = transport->send_pdu(conn,
3892                                 (struct iscsi_hdr *)((char *)ev + sizeof(*ev)),
3893                                 (char *)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3894                                 ev->u.send_pdu.data_size);
3895                 break;
3896         default:
3897                 err = -ENOSYS;
3898         }
3899
3900         mutex_unlock(&conn->ep_mutex);
3901         return err;
3902 }
3903
3904 static int
3905 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3906 {
3907         int err = 0;
3908         u32 portid;
3909         struct iscsi_uevent *ev = nlmsg_data(nlh);
3910         struct iscsi_transport *transport = NULL;
3911         struct iscsi_internal *priv;
3912         struct iscsi_cls_session *session;
3913         struct iscsi_endpoint *ep = NULL;
3914         u32 rlen;
3915
3916         if (!netlink_capable(skb, CAP_SYS_ADMIN))
3917                 return -EPERM;
3918
3919         if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3920                 *group = ISCSI_NL_GRP_UIP;
3921         else
3922                 *group = ISCSI_NL_GRP_ISCSID;
3923
3924         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3925         if (!priv)
3926                 return -EINVAL;
3927         transport = priv->iscsi_transport;
3928
3929         if (!try_module_get(transport->owner))
3930                 return -EINVAL;
3931
3932         portid = NETLINK_CB(skb).portid;
3933
3934         /*
3935          * Even though the remaining payload may not be regarded as nlattr,
3936          * (like address or something else), calculate the remaining length
3937          * here to ease following length checks.
3938          */
3939         rlen = nlmsg_attrlen(nlh, sizeof(*ev));
3940
3941         switch (nlh->nlmsg_type) {
3942         case ISCSI_UEVENT_CREATE_SESSION:
3943                 err = iscsi_if_create_session(priv, ep, ev,
3944                                               portid,
3945                                               ev->u.c_session.initial_cmdsn,
3946                                               ev->u.c_session.cmds_max,
3947                                               ev->u.c_session.queue_depth);
3948                 break;
3949         case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3950                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3951                 if (!ep) {
3952                         err = -EINVAL;
3953                         break;
3954                 }
3955
3956                 err = iscsi_if_create_session(priv, ep, ev,
3957                                         portid,
3958                                         ev->u.c_bound_session.initial_cmdsn,
3959                                         ev->u.c_bound_session.cmds_max,
3960                                         ev->u.c_bound_session.queue_depth);
3961                 iscsi_put_endpoint(ep);
3962                 break;
3963         case ISCSI_UEVENT_DESTROY_SESSION:
3964                 session = iscsi_session_lookup(ev->u.d_session.sid);
3965                 if (!session)
3966                         err = -EINVAL;
3967                 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3968                         err = -EBUSY;
3969                 else
3970                         transport->destroy_session(session);
3971                 break;
3972         case ISCSI_UEVENT_DESTROY_SESSION_ASYNC:
3973                 session = iscsi_session_lookup(ev->u.d_session.sid);
3974                 if (!session)
3975                         err = -EINVAL;
3976                 else if (iscsi_session_has_conns(ev->u.d_session.sid))
3977                         err = -EBUSY;
3978                 else {
3979                         unsigned long flags;
3980
3981                         /* Prevent this session from being found again */
3982                         spin_lock_irqsave(&sesslock, flags);
3983                         list_del_init(&session->sess_list);
3984                         spin_unlock_irqrestore(&sesslock, flags);
3985
3986                         queue_work(system_unbound_wq, &session->destroy_work);
3987                 }
3988                 break;
3989         case ISCSI_UEVENT_UNBIND_SESSION:
3990                 session = iscsi_session_lookup(ev->u.d_session.sid);
3991                 if (session)
3992                         queue_work(session->workq, &session->unbind_work);
3993                 else
3994                         err = -EINVAL;
3995                 break;
3996         case ISCSI_UEVENT_SET_PARAM:
3997                 err = iscsi_if_set_param(transport, ev, rlen);
3998                 break;
3999         case ISCSI_UEVENT_CREATE_CONN:
4000         case ISCSI_UEVENT_DESTROY_CONN:
4001         case ISCSI_UEVENT_STOP_CONN:
4002         case ISCSI_UEVENT_START_CONN:
4003         case ISCSI_UEVENT_BIND_CONN:
4004         case ISCSI_UEVENT_SEND_PDU:
4005                 err = iscsi_if_transport_conn(transport, nlh, rlen);
4006                 break;
4007         case ISCSI_UEVENT_GET_STATS:
4008                 err = iscsi_if_get_stats(transport, nlh);
4009                 break;
4010         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
4011         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
4012         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
4013         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
4014                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type, rlen);
4015                 break;
4016         case ISCSI_UEVENT_TGT_DSCVR:
4017                 err = iscsi_tgt_dscvr(transport, ev, rlen);
4018                 break;
4019         case ISCSI_UEVENT_SET_HOST_PARAM:
4020                 err = iscsi_set_host_param(transport, ev, rlen);
4021                 break;
4022         case ISCSI_UEVENT_PATH_UPDATE:
4023                 err = iscsi_set_path(transport, ev, rlen);
4024                 break;
4025         case ISCSI_UEVENT_SET_IFACE_PARAMS:
4026                 err = iscsi_set_iface_params(transport, ev, rlen);
4027                 break;
4028         case ISCSI_UEVENT_PING:
4029                 err = iscsi_send_ping(transport, ev, rlen);
4030                 break;
4031         case ISCSI_UEVENT_GET_CHAP:
4032                 err = iscsi_get_chap(transport, nlh);
4033                 break;
4034         case ISCSI_UEVENT_DELETE_CHAP:
4035                 err = iscsi_delete_chap(transport, ev);
4036                 break;
4037         case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
4038                 err = iscsi_set_flashnode_param(transport, ev, rlen);
4039                 break;
4040         case ISCSI_UEVENT_NEW_FLASHNODE:
4041                 err = iscsi_new_flashnode(transport, ev, rlen);
4042                 break;
4043         case ISCSI_UEVENT_DEL_FLASHNODE:
4044                 err = iscsi_del_flashnode(transport, ev);
4045                 break;
4046         case ISCSI_UEVENT_LOGIN_FLASHNODE:
4047                 err = iscsi_login_flashnode(transport, ev);
4048                 break;
4049         case ISCSI_UEVENT_LOGOUT_FLASHNODE:
4050                 err = iscsi_logout_flashnode(transport, ev);
4051                 break;
4052         case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
4053                 err = iscsi_logout_flashnode_sid(transport, ev);
4054                 break;
4055         case ISCSI_UEVENT_SET_CHAP:
4056                 err = iscsi_set_chap(transport, ev, rlen);
4057                 break;
4058         case ISCSI_UEVENT_GET_HOST_STATS:
4059                 err = iscsi_get_host_stats(transport, nlh);
4060                 break;
4061         default:
4062                 err = -ENOSYS;
4063                 break;
4064         }
4065
4066         module_put(transport->owner);
4067         return err;
4068 }
4069
4070 /*
4071  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
4072  * Malformed skbs with wrong lengths or invalid creds are not processed.
4073  */
4074 static void
4075 iscsi_if_rx(struct sk_buff *skb)
4076 {
4077         u32 portid = NETLINK_CB(skb).portid;
4078
4079         mutex_lock(&rx_queue_mutex);
4080         while (skb->len >= NLMSG_HDRLEN) {
4081                 int err;
4082                 uint32_t rlen;
4083                 struct nlmsghdr *nlh;
4084                 struct iscsi_uevent *ev;
4085                 uint32_t group;
4086                 int retries = ISCSI_SEND_MAX_ALLOWED;
4087
4088                 nlh = nlmsg_hdr(skb);
4089                 if (nlh->nlmsg_len < sizeof(*nlh) + sizeof(*ev) ||
4090                     skb->len < nlh->nlmsg_len) {
4091                         break;
4092                 }
4093
4094                 ev = nlmsg_data(nlh);
4095                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
4096                 if (rlen > skb->len)
4097                         rlen = skb->len;
4098
4099                 err = iscsi_if_recv_msg(skb, nlh, &group);
4100                 if (err) {
4101                         ev->type = ISCSI_KEVENT_IF_ERROR;
4102                         ev->iferror = err;
4103                 }
4104                 do {
4105                         /*
4106                          * special case for GET_STATS:
4107                          * on success - sending reply and stats from
4108                          * inside of if_recv_msg(),
4109                          * on error - fall through.
4110                          */
4111                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
4112                                 break;
4113                         if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
4114                                 break;
4115                         err = iscsi_if_send_reply(portid, nlh->nlmsg_type,
4116                                                   ev, sizeof(*ev));
4117                         if (err == -EAGAIN && --retries < 0) {
4118                                 printk(KERN_WARNING "Send reply failed, error %d\n", err);
4119                                 break;
4120                         }
4121                 } while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
4122                 skb_pull(skb, rlen);
4123         }
4124         mutex_unlock(&rx_queue_mutex);
4125 }
4126
4127 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
4128 struct device_attribute dev_attr_##_prefix##_##_name =  \
4129         __ATTR(_name,_mode,_show,_store)
4130
4131 /*
4132  * iSCSI connection attrs
4133  */
4134 #define iscsi_conn_attr_show(param)                                     \
4135 static ssize_t                                                          \
4136 show_conn_param_##param(struct device *dev,                             \
4137                         struct device_attribute *attr, char *buf)       \
4138 {                                                                       \
4139         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
4140         struct iscsi_transport *t = conn->transport;                    \
4141         return t->get_conn_param(conn, param, buf);                     \
4142 }
4143
4144 #define iscsi_conn_attr(field, param)                                   \
4145         iscsi_conn_attr_show(param)                                     \
4146 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
4147                         NULL);
4148
4149 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
4150 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
4151 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
4152 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
4153 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
4154 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
4155 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
4156 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
4157 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
4158 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
4159 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
4160 iscsi_conn_attr(local_port, ISCSI_PARAM_LOCAL_PORT);
4161 iscsi_conn_attr(statsn, ISCSI_PARAM_STATSN);
4162 iscsi_conn_attr(keepalive_tmo, ISCSI_PARAM_KEEPALIVE_TMO);
4163 iscsi_conn_attr(max_segment_size, ISCSI_PARAM_MAX_SEGMENT_SIZE);
4164 iscsi_conn_attr(tcp_timestamp_stat, ISCSI_PARAM_TCP_TIMESTAMP_STAT);
4165 iscsi_conn_attr(tcp_wsf_disable, ISCSI_PARAM_TCP_WSF_DISABLE);
4166 iscsi_conn_attr(tcp_nagle_disable, ISCSI_PARAM_TCP_NAGLE_DISABLE);
4167 iscsi_conn_attr(tcp_timer_scale, ISCSI_PARAM_TCP_TIMER_SCALE);
4168 iscsi_conn_attr(tcp_timestamp_enable, ISCSI_PARAM_TCP_TIMESTAMP_EN);
4169 iscsi_conn_attr(fragment_disable, ISCSI_PARAM_IP_FRAGMENT_DISABLE);
4170 iscsi_conn_attr(ipv4_tos, ISCSI_PARAM_IPV4_TOS);
4171 iscsi_conn_attr(ipv6_traffic_class, ISCSI_PARAM_IPV6_TC);
4172 iscsi_conn_attr(ipv6_flow_label, ISCSI_PARAM_IPV6_FLOW_LABEL);
4173 iscsi_conn_attr(is_fw_assigned_ipv6, ISCSI_PARAM_IS_FW_ASSIGNED_IPV6);
4174 iscsi_conn_attr(tcp_xmit_wsf, ISCSI_PARAM_TCP_XMIT_WSF);
4175 iscsi_conn_attr(tcp_recv_wsf, ISCSI_PARAM_TCP_RECV_WSF);
4176 iscsi_conn_attr(local_ipaddr, ISCSI_PARAM_LOCAL_IPADDR);
4177
4178 static const char *const connection_state_names[] = {
4179         [ISCSI_CONN_UP] = "up",
4180         [ISCSI_CONN_DOWN] = "down",
4181         [ISCSI_CONN_FAILED] = "failed",
4182         [ISCSI_CONN_BOUND] = "bound"
4183 };
4184
4185 static ssize_t show_conn_state(struct device *dev,
4186                                struct device_attribute *attr, char *buf)
4187 {
4188         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);
4189         const char *state = "unknown";
4190         int conn_state = READ_ONCE(conn->state);
4191
4192         if (conn_state >= 0 &&
4193             conn_state < ARRAY_SIZE(connection_state_names))
4194                 state = connection_state_names[conn_state];
4195
4196         return sysfs_emit(buf, "%s\n", state);
4197 }
4198 static ISCSI_CLASS_ATTR(conn, state, S_IRUGO, show_conn_state,
4199                         NULL);
4200
4201 #define iscsi_conn_ep_attr_show(param)                                  \
4202 static ssize_t show_conn_ep_param_##param(struct device *dev,           \
4203                                           struct device_attribute *attr,\
4204                                           char *buf)                    \
4205 {                                                                       \
4206         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
4207         struct iscsi_transport *t = conn->transport;                    \
4208         struct iscsi_endpoint *ep;                                      \
4209         ssize_t rc;                                                     \
4210                                                                         \
4211         /*                                                              \
4212          * Need to make sure ep_disconnect does not free the LLD's      \
4213          * interconnect resources while we are trying to read them.     \
4214          */                                                             \
4215         mutex_lock(&conn->ep_mutex);                                    \
4216         ep = conn->ep;                                                  \
4217         if (!ep && t->ep_connect) {                                     \
4218                 mutex_unlock(&conn->ep_mutex);                          \
4219                 return -ENOTCONN;                                       \
4220         }                                                               \
4221                                                                         \
4222         if (ep)                                                         \
4223                 rc = t->get_ep_param(ep, param, buf);                   \
4224         else                                                            \
4225                 rc = t->get_conn_param(conn, param, buf);               \
4226         mutex_unlock(&conn->ep_mutex);                                  \
4227         return rc;                                                      \
4228 }
4229
4230 #define iscsi_conn_ep_attr(field, param)                                \
4231         iscsi_conn_ep_attr_show(param)                                  \
4232 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,                           \
4233                         show_conn_ep_param_##param, NULL);
4234
4235 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
4236 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
4237
4238 static struct attribute *iscsi_conn_attrs[] = {
4239         &dev_attr_conn_max_recv_dlength.attr,
4240         &dev_attr_conn_max_xmit_dlength.attr,
4241         &dev_attr_conn_header_digest.attr,
4242         &dev_attr_conn_data_digest.attr,
4243         &dev_attr_conn_ifmarker.attr,
4244         &dev_attr_conn_ofmarker.attr,
4245         &dev_attr_conn_address.attr,
4246         &dev_attr_conn_port.attr,
4247         &dev_attr_conn_exp_statsn.attr,
4248         &dev_attr_conn_persistent_address.attr,
4249         &dev_attr_conn_persistent_port.attr,
4250         &dev_attr_conn_ping_tmo.attr,
4251         &dev_attr_conn_recv_tmo.attr,
4252         &dev_attr_conn_local_port.attr,
4253         &dev_attr_conn_statsn.attr,
4254         &dev_attr_conn_keepalive_tmo.attr,
4255         &dev_attr_conn_max_segment_size.attr,
4256         &dev_attr_conn_tcp_timestamp_stat.attr,
4257         &dev_attr_conn_tcp_wsf_disable.attr,
4258         &dev_attr_conn_tcp_nagle_disable.attr,
4259         &dev_attr_conn_tcp_timer_scale.attr,
4260         &dev_attr_conn_tcp_timestamp_enable.attr,
4261         &dev_attr_conn_fragment_disable.attr,
4262         &dev_attr_conn_ipv4_tos.attr,
4263         &dev_attr_conn_ipv6_traffic_class.attr,
4264         &dev_attr_conn_ipv6_flow_label.attr,
4265         &dev_attr_conn_is_fw_assigned_ipv6.attr,
4266         &dev_attr_conn_tcp_xmit_wsf.attr,
4267         &dev_attr_conn_tcp_recv_wsf.attr,
4268         &dev_attr_conn_local_ipaddr.attr,
4269         &dev_attr_conn_state.attr,
4270         NULL,
4271 };
4272
4273 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
4274                                          struct attribute *attr, int i)
4275 {
4276         struct device *cdev = container_of(kobj, struct device, kobj);
4277         struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
4278         struct iscsi_transport *t = conn->transport;
4279         int param;
4280
4281         if (attr == &dev_attr_conn_max_recv_dlength.attr)
4282                 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
4283         else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
4284                 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
4285         else if (attr == &dev_attr_conn_header_digest.attr)
4286                 param = ISCSI_PARAM_HDRDGST_EN;
4287         else if (attr == &dev_attr_conn_data_digest.attr)
4288                 param = ISCSI_PARAM_DATADGST_EN;
4289         else if (attr == &dev_attr_conn_ifmarker.attr)
4290                 param = ISCSI_PARAM_IFMARKER_EN;
4291         else if (attr == &dev_attr_conn_ofmarker.attr)
4292                 param = ISCSI_PARAM_OFMARKER_EN;
4293         else if (attr == &dev_attr_conn_address.attr)
4294                 param = ISCSI_PARAM_CONN_ADDRESS;
4295         else if (attr == &dev_attr_conn_port.attr)
4296                 param = ISCSI_PARAM_CONN_PORT;
4297         else if (attr == &dev_attr_conn_exp_statsn.attr)
4298                 param = ISCSI_PARAM_EXP_STATSN;
4299         else if (attr == &dev_attr_conn_persistent_address.attr)
4300                 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
4301         else if (attr == &dev_attr_conn_persistent_port.attr)
4302                 param = ISCSI_PARAM_PERSISTENT_PORT;
4303         else if (attr == &dev_attr_conn_ping_tmo.attr)
4304                 param = ISCSI_PARAM_PING_TMO;
4305         else if (attr == &dev_attr_conn_recv_tmo.attr)
4306                 param = ISCSI_PARAM_RECV_TMO;
4307         else if (attr == &dev_attr_conn_local_port.attr)
4308                 param = ISCSI_PARAM_LOCAL_PORT;
4309         else if (attr == &dev_attr_conn_statsn.attr)
4310                 param = ISCSI_PARAM_STATSN;
4311         else if (attr == &dev_attr_conn_keepalive_tmo.attr)
4312                 param = ISCSI_PARAM_KEEPALIVE_TMO;
4313         else if (attr == &dev_attr_conn_max_segment_size.attr)
4314                 param = ISCSI_PARAM_MAX_SEGMENT_SIZE;
4315         else if (attr == &dev_attr_conn_tcp_timestamp_stat.attr)
4316                 param = ISCSI_PARAM_TCP_TIMESTAMP_STAT;
4317         else if (attr == &dev_attr_conn_tcp_wsf_disable.attr)
4318                 param = ISCSI_PARAM_TCP_WSF_DISABLE;
4319         else if (attr == &dev_attr_conn_tcp_nagle_disable.attr)
4320                 param = ISCSI_PARAM_TCP_NAGLE_DISABLE;
4321         else if (attr == &dev_attr_conn_tcp_timer_scale.attr)
4322                 param = ISCSI_PARAM_TCP_TIMER_SCALE;
4323         else if (attr == &dev_attr_conn_tcp_timestamp_enable.attr)
4324                 param = ISCSI_PARAM_TCP_TIMESTAMP_EN;
4325         else if (attr == &dev_attr_conn_fragment_disable.attr)
4326                 param = ISCSI_PARAM_IP_FRAGMENT_DISABLE;
4327         else if (attr == &dev_attr_conn_ipv4_tos.attr)
4328                 param = ISCSI_PARAM_IPV4_TOS;
4329         else if (attr == &dev_attr_conn_ipv6_traffic_class.attr)
4330                 param = ISCSI_PARAM_IPV6_TC;
4331         else if (attr == &dev_attr_conn_ipv6_flow_label.attr)
4332                 param = ISCSI_PARAM_IPV6_FLOW_LABEL;
4333         else if (attr == &dev_attr_conn_is_fw_assigned_ipv6.attr)
4334                 param = ISCSI_PARAM_IS_FW_ASSIGNED_IPV6;
4335         else if (attr == &dev_attr_conn_tcp_xmit_wsf.attr)
4336                 param = ISCSI_PARAM_TCP_XMIT_WSF;
4337         else if (attr == &dev_attr_conn_tcp_recv_wsf.attr)
4338                 param = ISCSI_PARAM_TCP_RECV_WSF;
4339         else if (attr == &dev_attr_conn_local_ipaddr.attr)
4340                 param = ISCSI_PARAM_LOCAL_IPADDR;
4341         else if (attr == &dev_attr_conn_state.attr)
4342                 return S_IRUGO;
4343         else {
4344                 WARN_ONCE(1, "Invalid conn attr");
4345                 return 0;
4346         }
4347
4348         return t->attr_is_visible(ISCSI_PARAM, param);
4349 }
4350
4351 static struct attribute_group iscsi_conn_group = {
4352         .attrs = iscsi_conn_attrs,
4353         .is_visible = iscsi_conn_attr_is_visible,
4354 };
4355
4356 /*
4357  * iSCSI session attrs
4358  */
4359 #define iscsi_session_attr_show(param, perm)                            \
4360 static ssize_t                                                          \
4361 show_session_param_##param(struct device *dev,                          \
4362                            struct device_attribute *attr, char *buf)    \
4363 {                                                                       \
4364         struct iscsi_cls_session *session =                             \
4365                 iscsi_dev_to_session(dev->parent);                      \
4366         struct iscsi_transport *t = session->transport;                 \
4367                                                                         \
4368         if (perm && !capable(CAP_SYS_ADMIN))                            \
4369                 return -EACCES;                                         \
4370         return t->get_session_param(session, param, buf);               \
4371 }
4372
4373 #define iscsi_session_attr(field, param, perm)                          \
4374         iscsi_session_attr_show(param, perm)                            \
4375 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
4376                         NULL);
4377 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
4378 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
4379 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
4380 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
4381 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
4382 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
4383 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
4384 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
4385 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
4386 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
4387 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
4388 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
4389 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
4390 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4391 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
4392 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
4393 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
4394 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
4395 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
4396 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
4397 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
4398 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
4399 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
4400 iscsi_session_attr(boot_root, ISCSI_PARAM_BOOT_ROOT, 0);
4401 iscsi_session_attr(boot_nic, ISCSI_PARAM_BOOT_NIC, 0);
4402 iscsi_session_attr(boot_target, ISCSI_PARAM_BOOT_TARGET, 0);
4403 iscsi_session_attr(auto_snd_tgt_disable, ISCSI_PARAM_AUTO_SND_TGT_DISABLE, 0);
4404 iscsi_session_attr(discovery_session, ISCSI_PARAM_DISCOVERY_SESS, 0);
4405 iscsi_session_attr(portal_type, ISCSI_PARAM_PORTAL_TYPE, 0);
4406 iscsi_session_attr(chap_auth, ISCSI_PARAM_CHAP_AUTH_EN, 0);
4407 iscsi_session_attr(discovery_logout, ISCSI_PARAM_DISCOVERY_LOGOUT_EN, 0);
4408 iscsi_session_attr(bidi_chap, ISCSI_PARAM_BIDI_CHAP_EN, 0);
4409 iscsi_session_attr(discovery_auth_optional,
4410                    ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL, 0);
4411 iscsi_session_attr(def_time2wait, ISCSI_PARAM_DEF_TIME2WAIT, 0);
4412 iscsi_session_attr(def_time2retain, ISCSI_PARAM_DEF_TIME2RETAIN, 0);
4413 iscsi_session_attr(isid, ISCSI_PARAM_ISID, 0);
4414 iscsi_session_attr(tsid, ISCSI_PARAM_TSID, 0);
4415 iscsi_session_attr(def_taskmgmt_tmo, ISCSI_PARAM_DEF_TASKMGMT_TMO, 0);
4416 iscsi_session_attr(discovery_parent_idx, ISCSI_PARAM_DISCOVERY_PARENT_IDX, 0);
4417 iscsi_session_attr(discovery_parent_type, ISCSI_PARAM_DISCOVERY_PARENT_TYPE, 0);
4418
4419 static ssize_t
4420 show_priv_session_target_state(struct device *dev, struct device_attribute *attr,
4421                         char *buf)
4422 {
4423         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4424
4425         return sysfs_emit(buf, "%s\n",
4426                         iscsi_session_target_state_name[session->target_state]);
4427 }
4428
4429 static ISCSI_CLASS_ATTR(priv_sess, target_state, S_IRUGO,
4430                         show_priv_session_target_state, NULL);
4431
4432 static ssize_t
4433 show_priv_session_state(struct device *dev, struct device_attribute *attr,
4434                         char *buf)
4435 {
4436         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4437         return sysfs_emit(buf, "%s\n", iscsi_session_state_name(session->state));
4438 }
4439 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
4440                         NULL);
4441 static ssize_t
4442 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
4443                         char *buf)
4444 {
4445         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4446         return sysfs_emit(buf, "%d\n", session->creator);
4447 }
4448 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
4449                         NULL);
4450 static ssize_t
4451 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
4452                             char *buf)
4453 {
4454         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4455         return sysfs_emit(buf, "%d\n", session->target_id);
4456 }
4457 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
4458                         show_priv_session_target_id, NULL);
4459
4460 #define iscsi_priv_session_attr_show(field, format)                     \
4461 static ssize_t                                                          \
4462 show_priv_session_##field(struct device *dev,                           \
4463                           struct device_attribute *attr, char *buf)     \
4464 {                                                                       \
4465         struct iscsi_cls_session *session =                             \
4466                         iscsi_dev_to_session(dev->parent);              \
4467         if (session->field == -1)                                       \
4468                 return sysfs_emit(buf, "off\n");                        \
4469         return sysfs_emit(buf, format"\n", session->field);             \
4470 }
4471
4472 #define iscsi_priv_session_attr_store(field)                            \
4473 static ssize_t                                                          \
4474 store_priv_session_##field(struct device *dev,                          \
4475                            struct device_attribute *attr,               \
4476                            const char *buf, size_t count)               \
4477 {                                                                       \
4478         int val;                                                        \
4479         char *cp;                                                       \
4480         struct iscsi_cls_session *session =                             \
4481                 iscsi_dev_to_session(dev->parent);                      \
4482         if ((session->state == ISCSI_SESSION_FREE) ||                   \
4483             (session->state == ISCSI_SESSION_FAILED))                   \
4484                 return -EBUSY;                                          \
4485         if (strncmp(buf, "off", 3) == 0) {                              \
4486                 session->field = -1;                                    \
4487                 session->field##_sysfs_override = true;                 \
4488         } else {                                                        \
4489                 val = simple_strtoul(buf, &cp, 0);                      \
4490                 if (*cp != '\0' && *cp != '\n')                         \
4491                         return -EINVAL;                                 \
4492                 session->field = val;                                   \
4493                 session->field##_sysfs_override = true;                 \
4494         }                                                               \
4495         return count;                                                   \
4496 }
4497
4498 #define iscsi_priv_session_rw_attr(field, format)                       \
4499         iscsi_priv_session_attr_show(field, format)                     \
4500         iscsi_priv_session_attr_store(field)                            \
4501 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,            \
4502                         show_priv_session_##field,                      \
4503                         store_priv_session_##field)
4504
4505 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
4506
4507 static struct attribute *iscsi_session_attrs[] = {
4508         &dev_attr_sess_initial_r2t.attr,
4509         &dev_attr_sess_max_outstanding_r2t.attr,
4510         &dev_attr_sess_immediate_data.attr,
4511         &dev_attr_sess_first_burst_len.attr,
4512         &dev_attr_sess_max_burst_len.attr,
4513         &dev_attr_sess_data_pdu_in_order.attr,
4514         &dev_attr_sess_data_seq_in_order.attr,
4515         &dev_attr_sess_erl.attr,
4516         &dev_attr_sess_targetname.attr,
4517         &dev_attr_sess_tpgt.attr,
4518         &dev_attr_sess_password.attr,
4519         &dev_attr_sess_password_in.attr,
4520         &dev_attr_sess_username.attr,
4521         &dev_attr_sess_username_in.attr,
4522         &dev_attr_sess_fast_abort.attr,
4523         &dev_attr_sess_abort_tmo.attr,
4524         &dev_attr_sess_lu_reset_tmo.attr,
4525         &dev_attr_sess_tgt_reset_tmo.attr,
4526         &dev_attr_sess_ifacename.attr,
4527         &dev_attr_sess_initiatorname.attr,
4528         &dev_attr_sess_targetalias.attr,
4529         &dev_attr_sess_boot_root.attr,
4530         &dev_attr_sess_boot_nic.attr,
4531         &dev_attr_sess_boot_target.attr,
4532         &dev_attr_priv_sess_recovery_tmo.attr,
4533         &dev_attr_priv_sess_state.attr,
4534         &dev_attr_priv_sess_target_state.attr,
4535         &dev_attr_priv_sess_creator.attr,
4536         &dev_attr_sess_chap_out_idx.attr,
4537         &dev_attr_sess_chap_in_idx.attr,
4538         &dev_attr_priv_sess_target_id.attr,
4539         &dev_attr_sess_auto_snd_tgt_disable.attr,
4540         &dev_attr_sess_discovery_session.attr,
4541         &dev_attr_sess_portal_type.attr,
4542         &dev_attr_sess_chap_auth.attr,
4543         &dev_attr_sess_discovery_logout.attr,
4544         &dev_attr_sess_bidi_chap.attr,
4545         &dev_attr_sess_discovery_auth_optional.attr,
4546         &dev_attr_sess_def_time2wait.attr,
4547         &dev_attr_sess_def_time2retain.attr,
4548         &dev_attr_sess_isid.attr,
4549         &dev_attr_sess_tsid.attr,
4550         &dev_attr_sess_def_taskmgmt_tmo.attr,
4551         &dev_attr_sess_discovery_parent_idx.attr,
4552         &dev_attr_sess_discovery_parent_type.attr,
4553         NULL,
4554 };
4555
4556 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
4557                                             struct attribute *attr, int i)
4558 {
4559         struct device *cdev = container_of(kobj, struct device, kobj);
4560         struct iscsi_cls_session *session = transport_class_to_session(cdev);
4561         struct iscsi_transport *t = session->transport;
4562         int param;
4563
4564         if (attr == &dev_attr_sess_initial_r2t.attr)
4565                 param = ISCSI_PARAM_INITIAL_R2T_EN;
4566         else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
4567                 param = ISCSI_PARAM_MAX_R2T;
4568         else if (attr == &dev_attr_sess_immediate_data.attr)
4569                 param = ISCSI_PARAM_IMM_DATA_EN;
4570         else if (attr == &dev_attr_sess_first_burst_len.attr)
4571                 param = ISCSI_PARAM_FIRST_BURST;
4572         else if (attr == &dev_attr_sess_max_burst_len.attr)
4573                 param = ISCSI_PARAM_MAX_BURST;
4574         else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
4575                 param = ISCSI_PARAM_PDU_INORDER_EN;
4576         else if (attr == &dev_attr_sess_data_seq_in_order.attr)
4577                 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
4578         else if (attr == &dev_attr_sess_erl.attr)
4579                 param = ISCSI_PARAM_ERL;
4580         else if (attr == &dev_attr_sess_targetname.attr)
4581                 param = ISCSI_PARAM_TARGET_NAME;
4582         else if (attr == &dev_attr_sess_tpgt.attr)
4583                 param = ISCSI_PARAM_TPGT;
4584         else if (attr == &dev_attr_sess_chap_in_idx.attr)
4585                 param = ISCSI_PARAM_CHAP_IN_IDX;
4586         else if (attr == &dev_attr_sess_chap_out_idx.attr)
4587                 param = ISCSI_PARAM_CHAP_OUT_IDX;
4588         else if (attr == &dev_attr_sess_password.attr)
4589                 param = ISCSI_PARAM_USERNAME;
4590         else if (attr == &dev_attr_sess_password_in.attr)
4591                 param = ISCSI_PARAM_USERNAME_IN;
4592         else if (attr == &dev_attr_sess_username.attr)
4593                 param = ISCSI_PARAM_PASSWORD;
4594         else if (attr == &dev_attr_sess_username_in.attr)
4595                 param = ISCSI_PARAM_PASSWORD_IN;
4596         else if (attr == &dev_attr_sess_fast_abort.attr)
4597                 param = ISCSI_PARAM_FAST_ABORT;
4598         else if (attr == &dev_attr_sess_abort_tmo.attr)
4599                 param = ISCSI_PARAM_ABORT_TMO;
4600         else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
4601                 param = ISCSI_PARAM_LU_RESET_TMO;
4602         else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
4603                 param = ISCSI_PARAM_TGT_RESET_TMO;
4604         else if (attr == &dev_attr_sess_ifacename.attr)
4605                 param = ISCSI_PARAM_IFACE_NAME;
4606         else if (attr == &dev_attr_sess_initiatorname.attr)
4607                 param = ISCSI_PARAM_INITIATOR_NAME;
4608         else if (attr == &dev_attr_sess_targetalias.attr)
4609                 param = ISCSI_PARAM_TARGET_ALIAS;
4610         else if (attr == &dev_attr_sess_boot_root.attr)
4611                 param = ISCSI_PARAM_BOOT_ROOT;
4612         else if (attr == &dev_attr_sess_boot_nic.attr)
4613                 param = ISCSI_PARAM_BOOT_NIC;
4614         else if (attr == &dev_attr_sess_boot_target.attr)
4615                 param = ISCSI_PARAM_BOOT_TARGET;
4616         else if (attr == &dev_attr_sess_auto_snd_tgt_disable.attr)
4617                 param = ISCSI_PARAM_AUTO_SND_TGT_DISABLE;
4618         else if (attr == &dev_attr_sess_discovery_session.attr)
4619                 param = ISCSI_PARAM_DISCOVERY_SESS;
4620         else if (attr == &dev_attr_sess_portal_type.attr)
4621                 param = ISCSI_PARAM_PORTAL_TYPE;
4622         else if (attr == &dev_attr_sess_chap_auth.attr)
4623                 param = ISCSI_PARAM_CHAP_AUTH_EN;
4624         else if (attr == &dev_attr_sess_discovery_logout.attr)
4625                 param = ISCSI_PARAM_DISCOVERY_LOGOUT_EN;
4626         else if (attr == &dev_attr_sess_bidi_chap.attr)
4627                 param = ISCSI_PARAM_BIDI_CHAP_EN;
4628         else if (attr == &dev_attr_sess_discovery_auth_optional.attr)
4629                 param = ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL;
4630         else if (attr == &dev_attr_sess_def_time2wait.attr)
4631                 param = ISCSI_PARAM_DEF_TIME2WAIT;
4632         else if (attr == &dev_attr_sess_def_time2retain.attr)
4633                 param = ISCSI_PARAM_DEF_TIME2RETAIN;
4634         else if (attr == &dev_attr_sess_isid.attr)
4635                 param = ISCSI_PARAM_ISID;
4636         else if (attr == &dev_attr_sess_tsid.attr)
4637                 param = ISCSI_PARAM_TSID;
4638         else if (attr == &dev_attr_sess_def_taskmgmt_tmo.attr)
4639                 param = ISCSI_PARAM_DEF_TASKMGMT_TMO;
4640         else if (attr == &dev_attr_sess_discovery_parent_idx.attr)
4641                 param = ISCSI_PARAM_DISCOVERY_PARENT_IDX;
4642         else if (attr == &dev_attr_sess_discovery_parent_type.attr)
4643                 param = ISCSI_PARAM_DISCOVERY_PARENT_TYPE;
4644         else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
4645                 return S_IRUGO | S_IWUSR;
4646         else if (attr == &dev_attr_priv_sess_state.attr)
4647                 return S_IRUGO;
4648         else if (attr == &dev_attr_priv_sess_target_state.attr)
4649                 return S_IRUGO;
4650         else if (attr == &dev_attr_priv_sess_creator.attr)
4651                 return S_IRUGO;
4652         else if (attr == &dev_attr_priv_sess_target_id.attr)
4653                 return S_IRUGO;
4654         else {
4655                 WARN_ONCE(1, "Invalid session attr");
4656                 return 0;
4657         }
4658
4659         return t->attr_is_visible(ISCSI_PARAM, param);
4660 }
4661
4662 static struct attribute_group iscsi_session_group = {
4663         .attrs = iscsi_session_attrs,
4664         .is_visible = iscsi_session_attr_is_visible,
4665 };
4666
4667 /*
4668  * iSCSI host attrs
4669  */
4670 #define iscsi_host_attr_show(param)                                     \
4671 static ssize_t                                                          \
4672 show_host_param_##param(struct device *dev,                             \
4673                         struct device_attribute *attr, char *buf)       \
4674 {                                                                       \
4675         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
4676         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
4677         return priv->iscsi_transport->get_host_param(shost, param, buf); \
4678 }
4679
4680 #define iscsi_host_attr(field, param)                                   \
4681         iscsi_host_attr_show(param)                                     \
4682 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
4683                         NULL);
4684
4685 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
4686 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
4687 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
4688 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
4689 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
4690 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
4691
4692 static struct attribute *iscsi_host_attrs[] = {
4693         &dev_attr_host_netdev.attr,
4694         &dev_attr_host_hwaddress.attr,
4695         &dev_attr_host_ipaddress.attr,
4696         &dev_attr_host_initiatorname.attr,
4697         &dev_attr_host_port_state.attr,
4698         &dev_attr_host_port_speed.attr,
4699         NULL,
4700 };
4701
4702 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
4703                                          struct attribute *attr, int i)
4704 {
4705         struct device *cdev = container_of(kobj, struct device, kobj);
4706         struct Scsi_Host *shost = transport_class_to_shost(cdev);
4707         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
4708         int param;
4709
4710         if (attr == &dev_attr_host_netdev.attr)
4711                 param = ISCSI_HOST_PARAM_NETDEV_NAME;
4712         else if (attr == &dev_attr_host_hwaddress.attr)
4713                 param = ISCSI_HOST_PARAM_HWADDRESS;
4714         else if (attr == &dev_attr_host_ipaddress.attr)
4715                 param = ISCSI_HOST_PARAM_IPADDRESS;
4716         else if (attr == &dev_attr_host_initiatorname.attr)
4717                 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
4718         else if (attr == &dev_attr_host_port_state.attr)
4719                 param = ISCSI_HOST_PARAM_PORT_STATE;
4720         else if (attr == &dev_attr_host_port_speed.attr)
4721                 param = ISCSI_HOST_PARAM_PORT_SPEED;
4722         else {
4723                 WARN_ONCE(1, "Invalid host attr");
4724                 return 0;
4725         }
4726
4727         return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
4728 }
4729
4730 static struct attribute_group iscsi_host_group = {
4731         .attrs = iscsi_host_attrs,
4732         .is_visible = iscsi_host_attr_is_visible,
4733 };
4734
4735 /* convert iscsi_port_speed values to ascii string name */
4736 static const struct {
4737         enum iscsi_port_speed   value;
4738         char                    *name;
4739 } iscsi_port_speed_names[] = {
4740         {ISCSI_PORT_SPEED_UNKNOWN,      "Unknown" },
4741         {ISCSI_PORT_SPEED_10MBPS,       "10 Mbps" },
4742         {ISCSI_PORT_SPEED_100MBPS,      "100 Mbps" },
4743         {ISCSI_PORT_SPEED_1GBPS,        "1 Gbps" },
4744         {ISCSI_PORT_SPEED_10GBPS,       "10 Gbps" },
4745         {ISCSI_PORT_SPEED_25GBPS,       "25 Gbps" },
4746         {ISCSI_PORT_SPEED_40GBPS,       "40 Gbps" },
4747 };
4748
4749 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
4750 {
4751         int i;
4752         char *speed = "Unknown!";
4753         struct iscsi_cls_host *ihost = shost->shost_data;
4754         uint32_t port_speed = ihost->port_speed;
4755
4756         for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
4757                 if (iscsi_port_speed_names[i].value & port_speed) {
4758                         speed = iscsi_port_speed_names[i].name;
4759                         break;
4760                 }
4761         }
4762         return speed;
4763 }
4764 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
4765
4766 /* convert iscsi_port_state values to ascii string name */
4767 static const struct {
4768         enum iscsi_port_state   value;
4769         char                    *name;
4770 } iscsi_port_state_names[] = {
4771         {ISCSI_PORT_STATE_DOWN,         "LINK DOWN" },
4772         {ISCSI_PORT_STATE_UP,           "LINK UP" },
4773 };
4774
4775 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
4776 {
4777         int i;
4778         char *state = "Unknown!";
4779         struct iscsi_cls_host *ihost = shost->shost_data;
4780         uint32_t port_state = ihost->port_state;
4781
4782         for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
4783                 if (iscsi_port_state_names[i].value & port_state) {
4784                         state = iscsi_port_state_names[i].name;
4785                         break;
4786                 }
4787         }
4788         return state;
4789 }
4790 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
4791
4792 static int iscsi_session_match(struct attribute_container *cont,
4793                            struct device *dev)
4794 {
4795         struct iscsi_cls_session *session;
4796         struct Scsi_Host *shost;
4797         struct iscsi_internal *priv;
4798
4799         if (!iscsi_is_session_dev(dev))
4800                 return 0;
4801
4802         session = iscsi_dev_to_session(dev);
4803         shost = iscsi_session_to_shost(session);
4804         if (!shost->transportt)
4805                 return 0;
4806
4807         priv = to_iscsi_internal(shost->transportt);
4808         if (priv->session_cont.ac.class != &iscsi_session_class.class)
4809                 return 0;
4810
4811         return &priv->session_cont.ac == cont;
4812 }
4813
4814 static int iscsi_conn_match(struct attribute_container *cont,
4815                            struct device *dev)
4816 {
4817         struct iscsi_cls_session *session;
4818         struct iscsi_cls_conn *conn;
4819         struct Scsi_Host *shost;
4820         struct iscsi_internal *priv;
4821
4822         if (!iscsi_is_conn_dev(dev))
4823                 return 0;
4824
4825         conn = iscsi_dev_to_conn(dev);
4826         session = iscsi_dev_to_session(conn->dev.parent);
4827         shost = iscsi_session_to_shost(session);
4828
4829         if (!shost->transportt)
4830                 return 0;
4831
4832         priv = to_iscsi_internal(shost->transportt);
4833         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
4834                 return 0;
4835
4836         return &priv->conn_cont.ac == cont;
4837 }
4838
4839 static int iscsi_host_match(struct attribute_container *cont,
4840                             struct device *dev)
4841 {
4842         struct Scsi_Host *shost;
4843         struct iscsi_internal *priv;
4844
4845         if (!scsi_is_host_device(dev))
4846                 return 0;
4847
4848         shost = dev_to_shost(dev);
4849         if (!shost->transportt  ||
4850             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
4851                 return 0;
4852
4853         priv = to_iscsi_internal(shost->transportt);
4854         return &priv->t.host_attrs.ac == cont;
4855 }
4856
4857 struct scsi_transport_template *
4858 iscsi_register_transport(struct iscsi_transport *tt)
4859 {
4860         struct iscsi_internal *priv;
4861         unsigned long flags;
4862         int err;
4863
4864         BUG_ON(!tt);
4865         WARN_ON(tt->ep_disconnect && !tt->unbind_conn);
4866
4867         priv = iscsi_if_transport_lookup(tt);
4868         if (priv)
4869                 return NULL;
4870
4871         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
4872         if (!priv)
4873                 return NULL;
4874         INIT_LIST_HEAD(&priv->list);
4875         priv->iscsi_transport = tt;
4876         priv->t.user_scan = iscsi_user_scan;
4877
4878         priv->dev.class = &iscsi_transport_class;
4879         dev_set_name(&priv->dev, "%s", tt->name);
4880         err = device_register(&priv->dev);
4881         if (err)
4882                 goto put_dev;
4883
4884         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
4885         if (err)
4886                 goto unregister_dev;
4887
4888         /* host parameters */
4889         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
4890         priv->t.host_attrs.ac.match = iscsi_host_match;
4891         priv->t.host_attrs.ac.grp = &iscsi_host_group;
4892         priv->t.host_size = sizeof(struct iscsi_cls_host);
4893         transport_container_register(&priv->t.host_attrs);
4894
4895         /* connection parameters */
4896         priv->conn_cont.ac.class = &iscsi_connection_class.class;
4897         priv->conn_cont.ac.match = iscsi_conn_match;
4898         priv->conn_cont.ac.grp = &iscsi_conn_group;
4899         transport_container_register(&priv->conn_cont);
4900
4901         /* session parameters */
4902         priv->session_cont.ac.class = &iscsi_session_class.class;
4903         priv->session_cont.ac.match = iscsi_session_match;
4904         priv->session_cont.ac.grp = &iscsi_session_group;
4905         transport_container_register(&priv->session_cont);
4906
4907         spin_lock_irqsave(&iscsi_transport_lock, flags);
4908         list_add(&priv->list, &iscsi_transports);
4909         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4910
4911         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
4912         return &priv->t;
4913
4914 unregister_dev:
4915         device_unregister(&priv->dev);
4916         return NULL;
4917 put_dev:
4918         put_device(&priv->dev);
4919         return NULL;
4920 }
4921 EXPORT_SYMBOL_GPL(iscsi_register_transport);
4922
4923 void iscsi_unregister_transport(struct iscsi_transport *tt)
4924 {
4925         struct iscsi_internal *priv;
4926         unsigned long flags;
4927
4928         BUG_ON(!tt);
4929
4930         mutex_lock(&rx_queue_mutex);
4931
4932         priv = iscsi_if_transport_lookup(tt);
4933         BUG_ON (!priv);
4934
4935         spin_lock_irqsave(&iscsi_transport_lock, flags);
4936         list_del(&priv->list);
4937         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4938
4939         transport_container_unregister(&priv->conn_cont);
4940         transport_container_unregister(&priv->session_cont);
4941         transport_container_unregister(&priv->t.host_attrs);
4942
4943         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
4944         device_unregister(&priv->dev);
4945         mutex_unlock(&rx_queue_mutex);
4946 }
4947 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
4948
4949 void iscsi_dbg_trace(void (*trace)(struct device *dev, struct va_format *),
4950                      struct device *dev, const char *fmt, ...)
4951 {
4952         struct va_format vaf;
4953         va_list args;
4954
4955         va_start(args, fmt);
4956         vaf.fmt = fmt;
4957         vaf.va = &args;
4958         trace(dev, &vaf);
4959         va_end(args);
4960 }
4961 EXPORT_SYMBOL_GPL(iscsi_dbg_trace);
4962
4963 static __init int iscsi_transport_init(void)
4964 {
4965         int err;
4966         struct netlink_kernel_cfg cfg = {
4967                 .groups = 1,
4968                 .input  = iscsi_if_rx,
4969         };
4970         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
4971                 ISCSI_TRANSPORT_VERSION);
4972
4973         atomic_set(&iscsi_session_nr, 0);
4974
4975         err = class_register(&iscsi_transport_class);
4976         if (err)
4977                 return err;
4978
4979         err = class_register(&iscsi_endpoint_class);
4980         if (err)
4981                 goto unregister_transport_class;
4982
4983         err = class_register(&iscsi_iface_class);
4984         if (err)
4985                 goto unregister_endpoint_class;
4986
4987         err = transport_class_register(&iscsi_host_class);
4988         if (err)
4989                 goto unregister_iface_class;
4990
4991         err = transport_class_register(&iscsi_connection_class);
4992         if (err)
4993                 goto unregister_host_class;
4994
4995         err = transport_class_register(&iscsi_session_class);
4996         if (err)
4997                 goto unregister_conn_class;
4998
4999         err = bus_register(&iscsi_flashnode_bus);
5000         if (err)
5001                 goto unregister_session_class;
5002
5003         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
5004         if (!nls) {
5005                 err = -ENOBUFS;
5006                 goto unregister_flashnode_bus;
5007         }
5008
5009         iscsi_conn_cleanup_workq = alloc_workqueue("%s",
5010                         WQ_SYSFS | WQ_MEM_RECLAIM | WQ_UNBOUND, 0,
5011                         "iscsi_conn_cleanup");
5012         if (!iscsi_conn_cleanup_workq) {
5013                 err = -ENOMEM;
5014                 goto release_nls;
5015         }
5016
5017         return 0;
5018
5019 release_nls:
5020         netlink_kernel_release(nls);
5021 unregister_flashnode_bus:
5022         bus_unregister(&iscsi_flashnode_bus);
5023 unregister_session_class:
5024         transport_class_unregister(&iscsi_session_class);
5025 unregister_conn_class:
5026         transport_class_unregister(&iscsi_connection_class);
5027 unregister_host_class:
5028         transport_class_unregister(&iscsi_host_class);
5029 unregister_iface_class:
5030         class_unregister(&iscsi_iface_class);
5031 unregister_endpoint_class:
5032         class_unregister(&iscsi_endpoint_class);
5033 unregister_transport_class:
5034         class_unregister(&iscsi_transport_class);
5035         return err;
5036 }
5037
5038 static void __exit iscsi_transport_exit(void)
5039 {
5040         destroy_workqueue(iscsi_conn_cleanup_workq);
5041         netlink_kernel_release(nls);
5042         bus_unregister(&iscsi_flashnode_bus);
5043         transport_class_unregister(&iscsi_connection_class);
5044         transport_class_unregister(&iscsi_session_class);
5045         transport_class_unregister(&iscsi_host_class);
5046         class_unregister(&iscsi_endpoint_class);
5047         class_unregister(&iscsi_iface_class);
5048         class_unregister(&iscsi_transport_class);
5049 }
5050
5051 module_init(iscsi_transport_init);
5052 module_exit(iscsi_transport_exit);
5053
5054 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
5055               "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
5056               "Alex Aizman <itn780@yahoo.com>");
5057 MODULE_DESCRIPTION("iSCSI Transport Interface");
5058 MODULE_LICENSE("GPL");
5059 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
5060 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);