drivers/infiniband/sw/rxe/rxe_qp.c

   1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
   2 /*
   3  * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
   4  * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
   5  */
   6
   7 #include <linux/skbuff.h>
   8 #include <linux/delay.h>
   9 #include <linux/sched.h>
  10 #include <linux/vmalloc.h>
  11 #include <rdma/uverbs_ioctl.h>
  12
  13 #include "rxe.h"
  14 #include "rxe_loc.h"
  15 #include "rxe_queue.h"
  16 #include "rxe_task.h"
  17
  18 static int rxe_qp_chk_cap(struct rxe_dev *rxe, struct ib_qp_cap *cap,
  19                           int has_srq)
  20 {
  21         if (cap->max_send_wr > rxe->attr.max_qp_wr) {
  22                 pr_warn("invalid send wr = %u > %d\n",
  23                         cap->max_send_wr, rxe->attr.max_qp_wr);
  24                 goto err1;
  25         }
  26
  27         if (cap->max_send_sge > rxe->attr.max_send_sge) {
  28                 pr_warn("invalid send sge = %u > %d\n",
  29                         cap->max_send_sge, rxe->attr.max_send_sge);
  30                 goto err1;
  31         }
  32
  33         if (!has_srq) {
  34                 if (cap->max_recv_wr > rxe->attr.max_qp_wr) {
  35                         pr_warn("invalid recv wr = %u > %d\n",
  36                                 cap->max_recv_wr, rxe->attr.max_qp_wr);
  37                         goto err1;
  38                 }
  39
  40                 if (cap->max_recv_sge > rxe->attr.max_recv_sge) {
  41                         pr_warn("invalid recv sge = %u > %d\n",
  42                                 cap->max_recv_sge, rxe->attr.max_recv_sge);
  43                         goto err1;
  44                 }
  45         }
  46
  47         if (cap->max_inline_data > rxe->max_inline_data) {
  48                 pr_warn("invalid max inline data = %u > %d\n",
  49                         cap->max_inline_data, rxe->max_inline_data);
  50                 goto err1;
  51         }
  52
  53         return 0;
  54
  55 err1:
  56         return -EINVAL;
  57 }
  58
  59 int rxe_qp_chk_init(struct rxe_dev *rxe, struct ib_qp_init_attr *init)
  60 {
  61         struct ib_qp_cap *cap = &init->cap;
  62         struct rxe_port *port;
  63         int port_num = init->port_num;
  64
  65         switch (init->qp_type) {
  66         case IB_QPT_GSI:
  67         case IB_QPT_RC:
  68         case IB_QPT_UC:
  69         case IB_QPT_UD:
  70                 break;
  71         default:
  72                 return -EOPNOTSUPP;
  73         }
  74
  75         if (!init->recv_cq || !init->send_cq) {
  76                 pr_warn("missing cq\n");
  77                 goto err1;
  78         }
  79
  80         if (rxe_qp_chk_cap(rxe, cap, !!init->srq))
  81                 goto err1;
  82
  83         if (init->qp_type == IB_QPT_GSI) {
  84                 if (!rdma_is_port_valid(&rxe->ib_dev, port_num)) {
  85                         pr_warn("invalid port = %d\n", port_num);
  86                         goto err1;
  87                 }
  88
  89                 port = &rxe->port;
  90
  91                 if (init->qp_type == IB_QPT_GSI && port->qp_gsi_index) {
  92                         pr_warn("GSI QP exists for port %d\n", port_num);
  93                         goto err1;
  94                 }
  95         }
  96
  97         return 0;
  98
  99 err1:
 100         return -EINVAL;
 101 }
 102
 103 static int alloc_rd_atomic_resources(struct rxe_qp *qp, unsigned int n)
 104 {
 105         qp->resp.res_head = 0;
 106         qp->resp.res_tail = 0;
 107         qp->resp.resources = kcalloc(n, sizeof(struct resp_res), GFP_KERNEL);
 108
 109         if (!qp->resp.resources)
 110                 return -ENOMEM;
 111
 112         return 0;
 113 }
 114
 115 static void free_rd_atomic_resources(struct rxe_qp *qp)
 116 {
 117         if (qp->resp.resources) {
 118                 int i;
 119
 120                 for (i = 0; i < qp->attr.max_dest_rd_atomic; i++) {
 121                         struct resp_res *res = &qp->resp.resources[i];
 122
 123                         free_rd_atomic_resource(res);
 124                 }
 125                 kfree(qp->resp.resources);
 126                 qp->resp.resources = NULL;
 127         }
 128 }
 129
 130 void free_rd_atomic_resource(struct resp_res *res)
 131 {
 132         res->type = 0;
 133 }
 134
 135 static void cleanup_rd_atomic_resources(struct rxe_qp *qp)
 136 {
 137         int i;
 138         struct resp_res *res;
 139
 140         if (qp->resp.resources) {
 141                 for (i = 0; i < qp->attr.max_dest_rd_atomic; i++) {
 142                         res = &qp->resp.resources[i];
 143                         free_rd_atomic_resource(res);
 144                 }
 145         }
 146 }
 147
 148 static void rxe_qp_init_misc(struct rxe_dev *rxe, struct rxe_qp *qp,
 149                              struct ib_qp_init_attr *init)
 150 {
 151         struct rxe_port *port;
 152         u32 qpn;
 153
 154         qp->sq_sig_type         = init->sq_sig_type;
 155         qp->attr.path_mtu       = 1;
 156         qp->mtu                 = ib_mtu_enum_to_int(qp->attr.path_mtu);
 157
 158         qpn                     = qp->elem.index;
 159         port                    = &rxe->port;
 160
 161         switch (init->qp_type) {
 162         case IB_QPT_GSI:
 163                 qp->ibqp.qp_num         = 1;
 164                 port->qp_gsi_index      = qpn;
 165                 qp->attr.port_num       = init->port_num;
 166                 break;
 167
 168         default:
 169                 qp->ibqp.qp_num         = qpn;
 170                 break;
 171         }
 172
 173         spin_lock_init(&qp->state_lock);
 174
 175         spin_lock_init(&qp->req.task.state_lock);
 176         spin_lock_init(&qp->resp.task.state_lock);
 177         spin_lock_init(&qp->comp.task.state_lock);
 178
 179         spin_lock_init(&qp->sq.sq_lock);
 180         spin_lock_init(&qp->rq.producer_lock);
 181         spin_lock_init(&qp->rq.consumer_lock);
 182
 183         atomic_set(&qp->ssn, 0);
 184         atomic_set(&qp->skb_out, 0);
 185 }
 186
 187 static int rxe_qp_init_req(struct rxe_dev *rxe, struct rxe_qp *qp,
 188                            struct ib_qp_init_attr *init, struct ib_udata *udata,
 189                            struct rxe_create_qp_resp __user *uresp)
 190 {
 191         int err;
 192         int wqe_size;
 193         enum queue_type type;
 194
 195         err = sock_create_kern(&init_net, AF_INET, SOCK_DGRAM, 0, &qp->sk);
 196         if (err < 0)
 197                 return err;
 198         qp->sk->sk->sk_user_data = qp;
 199
 200         /* pick a source UDP port number for this QP based on
 201          * the source QPN. this spreads traffic for different QPs
 202          * across different NIC RX queues (while using a single
 203          * flow for a given QP to maintain packet order).
 204          * the port number must be in the Dynamic Ports range
 205          * (0xc000 - 0xffff).
 206          */
 207         qp->src_port = RXE_ROCE_V2_SPORT + (hash_32(qp_num(qp), 14) & 0x3fff);
 208         qp->sq.max_wr           = init->cap.max_send_wr;
 209
 210         /* These caps are limited by rxe_qp_chk_cap() done by the caller */
 211         wqe_size = max_t(int, init->cap.max_send_sge * sizeof(struct ib_sge),
 212                          init->cap.max_inline_data);
 213         qp->sq.max_sge = init->cap.max_send_sge =
 214                 wqe_size / sizeof(struct ib_sge);
 215         qp->sq.max_inline = init->cap.max_inline_data = wqe_size;
 216         wqe_size += sizeof(struct rxe_send_wqe);
 217
 218         type = QUEUE_TYPE_FROM_CLIENT;
 219         qp->sq.queue = rxe_queue_init(rxe, &qp->sq.max_wr,
 220                                 wqe_size, type);
 221         if (!qp->sq.queue)
 222                 return -ENOMEM;
 223
 224         err = do_mmap_info(rxe, uresp ? &uresp->sq_mi : NULL, udata,
 225                            qp->sq.queue->buf, qp->sq.queue->buf_size,
 226                            &qp->sq.queue->ip);
 227
 228         if (err) {
 229                 vfree(qp->sq.queue->buf);
 230                 kfree(qp->sq.queue);
 231                 qp->sq.queue = NULL;
 232                 return err;
 233         }
 234
 235         qp->req.wqe_index = queue_get_producer(qp->sq.queue,
 236                                                QUEUE_TYPE_FROM_CLIENT);
 237
 238         qp->req.state           = QP_STATE_RESET;
 239         qp->comp.state          = QP_STATE_RESET;
 240         qp->req.opcode          = -1;
 241         qp->comp.opcode         = -1;
 242
 243         skb_queue_head_init(&qp->req_pkts);
 244
 245         rxe_init_task(&qp->req.task, qp,
 246                       rxe_requester, "req");
 247         rxe_init_task(&qp->comp.task, qp,
 248                       rxe_completer, "comp");
 249
 250         qp->qp_timeout_jiffies = 0; /* Can't be set for UD/UC in modify_qp */
 251         if (init->qp_type == IB_QPT_RC) {
 252                 timer_setup(&qp->rnr_nak_timer, rnr_nak_timer, 0);
 253                 timer_setup(&qp->retrans_timer, retransmit_timer, 0);
 254         }
 255         return 0;
 256 }
 257
 258 static int rxe_qp_init_resp(struct rxe_dev *rxe, struct rxe_qp *qp,
 259                             struct ib_qp_init_attr *init,
 260                             struct ib_udata *udata,
 261                             struct rxe_create_qp_resp __user *uresp)
 262 {
 263         int err;
 264         int wqe_size;
 265         enum queue_type type;
 266
 267         if (!qp->srq) {
 268                 qp->rq.max_wr           = init->cap.max_recv_wr;
 269                 qp->rq.max_sge          = init->cap.max_recv_sge;
 270
 271                 wqe_size = rcv_wqe_size(qp->rq.max_sge);
 272
 273                 pr_debug("qp#%d max_wr = %d, max_sge = %d, wqe_size = %d\n",
 274                          qp_num(qp), qp->rq.max_wr, qp->rq.max_sge, wqe_size);
 275
 276                 type = QUEUE_TYPE_FROM_CLIENT;
 277                 qp->rq.queue = rxe_queue_init(rxe, &qp->rq.max_wr,
 278                                         wqe_size, type);
 279                 if (!qp->rq.queue)
 280                         return -ENOMEM;
 281
 282                 err = do_mmap_info(rxe, uresp ? &uresp->rq_mi : NULL, udata,
 283                                    qp->rq.queue->buf, qp->rq.queue->buf_size,
 284                                    &qp->rq.queue->ip);
 285                 if (err) {
 286                         vfree(qp->rq.queue->buf);
 287                         kfree(qp->rq.queue);
 288                         qp->rq.queue = NULL;
 289                         return err;
 290                 }
 291         }
 292
 293         skb_queue_head_init(&qp->resp_pkts);
 294
 295         rxe_init_task(&qp->resp.task, qp,
 296                       rxe_responder, "resp");
 297
 298         qp->resp.opcode         = OPCODE_NONE;
 299         qp->resp.msn            = 0;
 300         qp->resp.state          = QP_STATE_RESET;
 301
 302         return 0;
 303 }
 304
 305 /* called by the create qp verb */
 306 int rxe_qp_from_init(struct rxe_dev *rxe, struct rxe_qp *qp, struct rxe_pd *pd,
 307                      struct ib_qp_init_attr *init,
 308                      struct rxe_create_qp_resp __user *uresp,
 309                      struct ib_pd *ibpd,
 310                      struct ib_udata *udata)
 311 {
 312         int err;
 313         struct rxe_cq *rcq = to_rcq(init->recv_cq);
 314         struct rxe_cq *scq = to_rcq(init->send_cq);
 315         struct rxe_srq *srq = init->srq ? to_rsrq(init->srq) : NULL;
 316
 317         rxe_get(pd);
 318         rxe_get(rcq);
 319         rxe_get(scq);
 320         if (srq)
 321                 rxe_get(srq);
 322
 323         qp->pd                  = pd;
 324         qp->rcq                 = rcq;
 325         qp->scq                 = scq;
 326         qp->srq                 = srq;
 327
 328         atomic_inc(&rcq->num_wq);
 329         atomic_inc(&scq->num_wq);
 330
 331         rxe_qp_init_misc(rxe, qp, init);
 332
 333         err = rxe_qp_init_req(rxe, qp, init, udata, uresp);
 334         if (err)
 335                 goto err1;
 336
 337         err = rxe_qp_init_resp(rxe, qp, init, udata, uresp);
 338         if (err)
 339                 goto err2;
 340
 341         qp->attr.qp_state = IB_QPS_RESET;
 342         qp->valid = 1;
 343
 344         return 0;
 345
 346 err2:
 347         rxe_queue_cleanup(qp->sq.queue);
 348         qp->sq.queue = NULL;
 349 err1:
 350         atomic_dec(&rcq->num_wq);
 351         atomic_dec(&scq->num_wq);
 352
 353         qp->pd = NULL;
 354         qp->rcq = NULL;
 355         qp->scq = NULL;
 356         qp->srq = NULL;
 357
 358         if (srq)
 359                 rxe_put(srq);
 360         rxe_put(scq);
 361         rxe_put(rcq);
 362         rxe_put(pd);
 363
 364         return err;
 365 }
 366
 367 /* called by the query qp verb */
 368 int rxe_qp_to_init(struct rxe_qp *qp, struct ib_qp_init_attr *init)
 369 {
 370         init->event_handler             = qp->ibqp.event_handler;
 371         init->qp_context                = qp->ibqp.qp_context;
 372         init->send_cq                   = qp->ibqp.send_cq;
 373         init->recv_cq                   = qp->ibqp.recv_cq;
 374         init->srq                       = qp->ibqp.srq;
 375
 376         init->cap.max_send_wr           = qp->sq.max_wr;
 377         init->cap.max_send_sge          = qp->sq.max_sge;
 378         init->cap.max_inline_data       = qp->sq.max_inline;
 379
 380         if (!qp->srq) {
 381                 init->cap.max_recv_wr           = qp->rq.max_wr;
 382                 init->cap.max_recv_sge          = qp->rq.max_sge;
 383         }
 384
 385         init->sq_sig_type               = qp->sq_sig_type;
 386
 387         init->qp_type                   = qp->ibqp.qp_type;
 388         init->port_num                  = 1;
 389
 390         return 0;
 391 }
 392
 393 /* called by the modify qp verb, this routine checks all the parameters before
 394  * making any changes
 395  */
 396 int rxe_qp_chk_attr(struct rxe_dev *rxe, struct rxe_qp *qp,
 397                     struct ib_qp_attr *attr, int mask)
 398 {
 399         enum ib_qp_state cur_state = (mask & IB_QP_CUR_STATE) ?
 400                                         attr->cur_qp_state : qp->attr.qp_state;
 401         enum ib_qp_state new_state = (mask & IB_QP_STATE) ?
 402                                         attr->qp_state : cur_state;
 403
 404         if (!ib_modify_qp_is_ok(cur_state, new_state, qp_type(qp), mask)) {
 405                 pr_warn("invalid mask or state for qp\n");
 406                 goto err1;
 407         }
 408
 409         if (mask & IB_QP_STATE) {
 410                 if (cur_state == IB_QPS_SQD) {
 411                         if (qp->req.state == QP_STATE_DRAIN &&
 412                             new_state != IB_QPS_ERR)
 413                                 goto err1;
 414                 }
 415         }
 416
 417         if (mask & IB_QP_PORT) {
 418                 if (!rdma_is_port_valid(&rxe->ib_dev, attr->port_num)) {
 419                         pr_warn("invalid port %d\n", attr->port_num);
 420                         goto err1;
 421                 }
 422         }
 423
 424         if (mask & IB_QP_CAP && rxe_qp_chk_cap(rxe, &attr->cap, !!qp->srq))
 425                 goto err1;
 426
 427         if (mask & IB_QP_AV && rxe_av_chk_attr(rxe, &attr->ah_attr))
 428                 goto err1;
 429
 430         if (mask & IB_QP_ALT_PATH) {
 431                 if (rxe_av_chk_attr(rxe, &attr->alt_ah_attr))
 432                         goto err1;
 433                 if (!rdma_is_port_valid(&rxe->ib_dev, attr->alt_port_num))  {
 434                         pr_warn("invalid alt port %d\n", attr->alt_port_num);
 435                         goto err1;
 436                 }
 437                 if (attr->alt_timeout > 31) {
 438                         pr_warn("invalid QP alt timeout %d > 31\n",
 439                                 attr->alt_timeout);
 440                         goto err1;
 441                 }
 442         }
 443
 444         if (mask & IB_QP_PATH_MTU) {
 445                 struct rxe_port *port = &rxe->port;
 446
 447                 enum ib_mtu max_mtu = port->attr.max_mtu;
 448                 enum ib_mtu mtu = attr->path_mtu;
 449
 450                 if (mtu > max_mtu) {
 451                         pr_debug("invalid mtu (%d) > (%d)\n",
 452                                  ib_mtu_enum_to_int(mtu),
 453                                  ib_mtu_enum_to_int(max_mtu));
 454                         goto err1;
 455                 }
 456         }
 457
 458         if (mask & IB_QP_MAX_QP_RD_ATOMIC) {
 459                 if (attr->max_rd_atomic > rxe->attr.max_qp_rd_atom) {
 460                         pr_warn("invalid max_rd_atomic %d > %d\n",
 461                                 attr->max_rd_atomic,
 462                                 rxe->attr.max_qp_rd_atom);
 463                         goto err1;
 464                 }
 465         }
 466
 467         if (mask & IB_QP_TIMEOUT) {
 468                 if (attr->timeout > 31) {
 469                         pr_warn("invalid QP timeout %d > 31\n",
 470                                 attr->timeout);
 471                         goto err1;
 472                 }
 473         }
 474
 475         return 0;
 476
 477 err1:
 478         return -EINVAL;
 479 }
 480
 481 /* move the qp to the reset state */
 482 static void rxe_qp_reset(struct rxe_qp *qp)
 483 {
 484         /* stop tasks from running */
 485         rxe_disable_task(&qp->resp.task);
 486
 487         /* stop request/comp */
 488         if (qp->sq.queue) {
 489                 if (qp_type(qp) == IB_QPT_RC)
 490                         rxe_disable_task(&qp->comp.task);
 491                 rxe_disable_task(&qp->req.task);
 492         }
 493
 494         /* move qp to the reset state */
 495         qp->req.state = QP_STATE_RESET;
 496         qp->comp.state = QP_STATE_RESET;
 497         qp->resp.state = QP_STATE_RESET;
 498
 499         /* let state machines reset themselves drain work and packet queues
 500          * etc.
 501          */
 502         __rxe_do_task(&qp->resp.task);
 503
 504         if (qp->sq.queue) {
 505                 __rxe_do_task(&qp->comp.task);
 506                 __rxe_do_task(&qp->req.task);
 507                 rxe_queue_reset(qp->sq.queue);
 508         }
 509
 510         /* cleanup attributes */
 511         atomic_set(&qp->ssn, 0);
 512         qp->req.opcode = -1;
 513         qp->req.need_retry = 0;
 514         qp->req.wait_for_rnr_timer = 0;
 515         qp->req.noack_pkts = 0;
 516         qp->resp.msn = 0;
 517         qp->resp.opcode = -1;
 518         qp->resp.drop_msg = 0;
 519         qp->resp.goto_error = 0;
 520         qp->resp.sent_psn_nak = 0;
 521
 522         if (qp->resp.mr) {
 523                 rxe_put(qp->resp.mr);
 524                 qp->resp.mr = NULL;
 525         }
 526
 527         cleanup_rd_atomic_resources(qp);
 528
 529         /* reenable tasks */
 530         rxe_enable_task(&qp->resp.task);
 531
 532         if (qp->sq.queue) {
 533                 if (qp_type(qp) == IB_QPT_RC)
 534                         rxe_enable_task(&qp->comp.task);
 535
 536                 rxe_enable_task(&qp->req.task);
 537         }
 538 }
 539
 540 /* drain the send queue */
 541 static void rxe_qp_drain(struct rxe_qp *qp)
 542 {
 543         if (qp->sq.queue) {
 544                 if (qp->req.state != QP_STATE_DRAINED) {
 545                         qp->req.state = QP_STATE_DRAIN;
 546                         if (qp_type(qp) == IB_QPT_RC)
 547                                 rxe_run_task(&qp->comp.task, 1);
 548                         else
 549                                 __rxe_do_task(&qp->comp.task);
 550                         rxe_run_task(&qp->req.task, 1);
 551                 }
 552         }
 553 }
 554
 555 /* move the qp to the error state */
 556 void rxe_qp_error(struct rxe_qp *qp)
 557 {
 558         qp->req.state = QP_STATE_ERROR;
 559         qp->resp.state = QP_STATE_ERROR;
 560         qp->comp.state = QP_STATE_ERROR;
 561         qp->attr.qp_state = IB_QPS_ERR;
 562
 563         /* drain work and packet queues */
 564         rxe_run_task(&qp->resp.task, 1);
 565
 566         if (qp_type(qp) == IB_QPT_RC)
 567                 rxe_run_task(&qp->comp.task, 1);
 568         else
 569                 __rxe_do_task(&qp->comp.task);
 570         rxe_run_task(&qp->req.task, 1);
 571 }
 572
 573 /* called by the modify qp verb */
 574 int rxe_qp_from_attr(struct rxe_qp *qp, struct ib_qp_attr *attr, int mask,
 575                      struct ib_udata *udata)
 576 {
 577         int err;
 578
 579         if (mask & IB_QP_MAX_QP_RD_ATOMIC) {
 580                 int max_rd_atomic = attr->max_rd_atomic ?
 581                         roundup_pow_of_two(attr->max_rd_atomic) : 0;
 582
 583                 qp->attr.max_rd_atomic = max_rd_atomic;
 584                 atomic_set(&qp->req.rd_atomic, max_rd_atomic);
 585         }
 586
 587         if (mask & IB_QP_MAX_DEST_RD_ATOMIC) {
 588                 int max_dest_rd_atomic = attr->max_dest_rd_atomic ?
 589                         roundup_pow_of_two(attr->max_dest_rd_atomic) : 0;
 590
 591                 qp->attr.max_dest_rd_atomic = max_dest_rd_atomic;
 592
 593                 free_rd_atomic_resources(qp);
 594
 595                 err = alloc_rd_atomic_resources(qp, max_dest_rd_atomic);
 596                 if (err)
 597                         return err;
 598         }
 599
 600         if (mask & IB_QP_CUR_STATE)
 601                 qp->attr.cur_qp_state = attr->qp_state;
 602
 603         if (mask & IB_QP_EN_SQD_ASYNC_NOTIFY)
 604                 qp->attr.en_sqd_async_notify = attr->en_sqd_async_notify;
 605
 606         if (mask & IB_QP_ACCESS_FLAGS)
 607                 qp->attr.qp_access_flags = attr->qp_access_flags;
 608
 609         if (mask & IB_QP_PKEY_INDEX)
 610                 qp->attr.pkey_index = attr->pkey_index;
 611
 612         if (mask & IB_QP_PORT)
 613                 qp->attr.port_num = attr->port_num;
 614
 615         if (mask & IB_QP_QKEY)
 616                 qp->attr.qkey = attr->qkey;
 617
 618         if (mask & IB_QP_AV)
 619                 rxe_init_av(&attr->ah_attr, &qp->pri_av);
 620
 621         if (mask & IB_QP_ALT_PATH) {
 622                 rxe_init_av(&attr->alt_ah_attr, &qp->alt_av);
 623                 qp->attr.alt_port_num = attr->alt_port_num;
 624                 qp->attr.alt_pkey_index = attr->alt_pkey_index;
 625                 qp->attr.alt_timeout = attr->alt_timeout;
 626         }
 627
 628         if (mask & IB_QP_PATH_MTU) {
 629                 qp->attr.path_mtu = attr->path_mtu;
 630                 qp->mtu = ib_mtu_enum_to_int(attr->path_mtu);
 631         }
 632
 633         if (mask & IB_QP_TIMEOUT) {
 634                 qp->attr.timeout = attr->timeout;
 635                 if (attr->timeout == 0) {
 636                         qp->qp_timeout_jiffies = 0;
 637                 } else {
 638                         /* According to the spec, timeout = 4.096 * 2 ^ attr->timeout [us] */
 639                         int j = nsecs_to_jiffies(4096ULL << attr->timeout);
 640
 641                         qp->qp_timeout_jiffies = j ? j : 1;
 642                 }
 643         }
 644
 645         if (mask & IB_QP_RETRY_CNT) {
 646                 qp->attr.retry_cnt = attr->retry_cnt;
 647                 qp->comp.retry_cnt = attr->retry_cnt;
 648                 pr_debug("qp#%d set retry count = %d\n", qp_num(qp),
 649                          attr->retry_cnt);
 650         }
 651
 652         if (mask & IB_QP_RNR_RETRY) {
 653                 qp->attr.rnr_retry = attr->rnr_retry;
 654                 qp->comp.rnr_retry = attr->rnr_retry;
 655                 pr_debug("qp#%d set rnr retry count = %d\n", qp_num(qp),
 656                          attr->rnr_retry);
 657         }
 658
 659         if (mask & IB_QP_RQ_PSN) {
 660                 qp->attr.rq_psn = (attr->rq_psn & BTH_PSN_MASK);
 661                 qp->resp.psn = qp->attr.rq_psn;
 662                 pr_debug("qp#%d set resp psn = 0x%x\n", qp_num(qp),
 663                          qp->resp.psn);
 664         }
 665
 666         if (mask & IB_QP_MIN_RNR_TIMER) {
 667                 qp->attr.min_rnr_timer = attr->min_rnr_timer;
 668                 pr_debug("qp#%d set min rnr timer = 0x%x\n", qp_num(qp),
 669                          attr->min_rnr_timer);
 670         }
 671
 672         if (mask & IB_QP_SQ_PSN) {
 673                 qp->attr.sq_psn = (attr->sq_psn & BTH_PSN_MASK);
 674                 qp->req.psn = qp->attr.sq_psn;
 675                 qp->comp.psn = qp->attr.sq_psn;
 676                 pr_debug("qp#%d set req psn = 0x%x\n", qp_num(qp), qp->req.psn);
 677         }
 678
 679         if (mask & IB_QP_PATH_MIG_STATE)
 680                 qp->attr.path_mig_state = attr->path_mig_state;
 681
 682         if (mask & IB_QP_DEST_QPN)
 683                 qp->attr.dest_qp_num = attr->dest_qp_num;
 684
 685         if (mask & IB_QP_STATE) {
 686                 qp->attr.qp_state = attr->qp_state;
 687
 688                 switch (attr->qp_state) {
 689                 case IB_QPS_RESET:
 690                         pr_debug("qp#%d state -> RESET\n", qp_num(qp));
 691                         rxe_qp_reset(qp);
 692                         break;
 693
 694                 case IB_QPS_INIT:
 695                         pr_debug("qp#%d state -> INIT\n", qp_num(qp));
 696                         qp->req.state = QP_STATE_INIT;
 697                         qp->resp.state = QP_STATE_INIT;
 698                         qp->comp.state = QP_STATE_INIT;
 699                         break;
 700
 701                 case IB_QPS_RTR:
 702                         pr_debug("qp#%d state -> RTR\n", qp_num(qp));
 703                         qp->resp.state = QP_STATE_READY;
 704                         break;
 705
 706                 case IB_QPS_RTS:
 707                         pr_debug("qp#%d state -> RTS\n", qp_num(qp));
 708                         qp->req.state = QP_STATE_READY;
 709                         qp->comp.state = QP_STATE_READY;
 710                         break;
 711
 712                 case IB_QPS_SQD:
 713                         pr_debug("qp#%d state -> SQD\n", qp_num(qp));
 714                         rxe_qp_drain(qp);
 715                         break;
 716
 717                 case IB_QPS_SQE:
 718                         pr_warn("qp#%d state -> SQE !!?\n", qp_num(qp));
 719                         /* Not possible from modify_qp. */
 720                         break;
 721
 722                 case IB_QPS_ERR:
 723                         pr_debug("qp#%d state -> ERR\n", qp_num(qp));
 724                         rxe_qp_error(qp);
 725                         break;
 726                 }
 727         }
 728
 729         return 0;
 730 }
 731
 732 /* called by the query qp verb */
 733 int rxe_qp_to_attr(struct rxe_qp *qp, struct ib_qp_attr *attr, int mask)
 734 {
 735         *attr = qp->attr;
 736
 737         attr->rq_psn                            = qp->resp.psn;
 738         attr->sq_psn                            = qp->req.psn;
 739
 740         attr->cap.max_send_wr                   = qp->sq.max_wr;
 741         attr->cap.max_send_sge                  = qp->sq.max_sge;
 742         attr->cap.max_inline_data               = qp->sq.max_inline;
 743
 744         if (!qp->srq) {
 745                 attr->cap.max_recv_wr           = qp->rq.max_wr;
 746                 attr->cap.max_recv_sge          = qp->rq.max_sge;
 747         }
 748
 749         rxe_av_to_attr(&qp->pri_av, &attr->ah_attr);
 750         rxe_av_to_attr(&qp->alt_av, &attr->alt_ah_attr);
 751
 752         if (qp->req.state == QP_STATE_DRAIN) {
 753                 attr->sq_draining = 1;
 754                 /* applications that get this state
 755                  * typically spin on it. yield the
 756                  * processor
 757                  */
 758                 cond_resched();
 759         } else {
 760                 attr->sq_draining = 0;
 761         }
 762
 763         pr_debug("attr->sq_draining = %d\n", attr->sq_draining);
 764
 765         return 0;
 766 }
 767
 768 int rxe_qp_chk_destroy(struct rxe_qp *qp)
 769 {
 770         /* See IBA o10-2.2.3
 771          * An attempt to destroy a QP while attached to a mcast group
 772          * will fail immediately.
 773          */
 774         if (atomic_read(&qp->mcg_num)) {
 775                 pr_debug("Attempt to destroy QP while attached to multicast group\n");
 776                 return -EBUSY;
 777         }
 778
 779         return 0;
 780 }
 781
 782 /* called when the last reference to the qp is dropped */
 783 static void rxe_qp_do_cleanup(struct work_struct *work)
 784 {
 785         struct rxe_qp *qp = container_of(work, typeof(*qp), cleanup_work.work);
 786
 787         qp->valid = 0;
 788         qp->qp_timeout_jiffies = 0;
 789         rxe_cleanup_task(&qp->resp.task);
 790
 791         if (qp_type(qp) == IB_QPT_RC) {
 792                 del_timer_sync(&qp->retrans_timer);
 793                 del_timer_sync(&qp->rnr_nak_timer);
 794         }
 795
 796         rxe_cleanup_task(&qp->req.task);
 797         rxe_cleanup_task(&qp->comp.task);
 798
 799         /* flush out any receive wr's or pending requests */
 800         if (qp->req.task.func)
 801                 __rxe_do_task(&qp->req.task);
 802
 803         if (qp->sq.queue) {
 804                 __rxe_do_task(&qp->comp.task);
 805                 __rxe_do_task(&qp->req.task);
 806         }
 807
 808         if (qp->sq.queue)
 809                 rxe_queue_cleanup(qp->sq.queue);
 810
 811         if (qp->srq)
 812                 rxe_put(qp->srq);
 813
 814         if (qp->rq.queue)
 815                 rxe_queue_cleanup(qp->rq.queue);
 816
 817         if (qp->scq) {
 818                 atomic_dec(&qp->scq->num_wq);
 819                 rxe_put(qp->scq);
 820         }
 821
 822         if (qp->rcq) {
 823                 atomic_dec(&qp->rcq->num_wq);
 824                 rxe_put(qp->rcq);
 825         }
 826
 827         if (qp->pd)
 828                 rxe_put(qp->pd);
 829
 830         if (qp->resp.mr)
 831                 rxe_put(qp->resp.mr);
 832
 833         if (qp_type(qp) == IB_QPT_RC)
 834                 sk_dst_reset(qp->sk->sk);
 835
 836         free_rd_atomic_resources(qp);
 837
 838         if (qp->sk) {
 839                 kernel_sock_shutdown(qp->sk, SHUT_RDWR);
 840                 sock_release(qp->sk);
 841         }
 842 }
 843
 844 /* called when the last reference to the qp is dropped */
 845 void rxe_qp_cleanup(struct rxe_pool_elem *elem)
 846 {
 847         struct rxe_qp *qp = container_of(elem, typeof(*qp), elem);
 848
 849         execute_in_process_context(rxe_qp_do_cleanup, &qp->cleanup_work);
 850 }