drivers/infiniband/sw/rxe/rxe_qp.c

   1 /*
   2  * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
   3  * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *         Redistribution and use in source and binary forms, with or
  12  *         without modification, are permitted provided that the following
  13  *         conditions are met:
  14  *
  15  *              - Redistributions of source code must retain the above
  16  *                copyright notice, this list of conditions and the following
  17  *                disclaimer.
  18  *
  19  *              - Redistributions in binary form must reproduce the above
  20  *                copyright notice, this list of conditions and the following
  21  *                disclaimer in the documentation and/or other materials
  22  *                provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #include <linux/skbuff.h>
  35 #include <linux/delay.h>
  36 #include <linux/sched.h>
  37
  38 #include "rxe.h"
  39 #include "rxe_loc.h"
  40 #include "rxe_queue.h"
  41 #include "rxe_task.h"
  42
  43 char *rxe_qp_state_name[] = {
  44         [QP_STATE_RESET]        = "RESET",
  45         [QP_STATE_INIT]         = "INIT",
  46         [QP_STATE_READY]        = "READY",
  47         [QP_STATE_DRAIN]        = "DRAIN",
  48         [QP_STATE_DRAINED]      = "DRAINED",
  49         [QP_STATE_ERROR]        = "ERROR",
  50 };
  51
  52 static int rxe_qp_chk_cap(struct rxe_dev *rxe, struct ib_qp_cap *cap,
  53                           int has_srq)
  54 {
  55         if (cap->max_send_wr > rxe->attr.max_qp_wr) {
  56                 pr_warn("invalid send wr = %d > %d\n",
  57                         cap->max_send_wr, rxe->attr.max_qp_wr);
  58                 goto err1;
  59         }
  60
  61         if (cap->max_send_sge > rxe->attr.max_sge) {
  62                 pr_warn("invalid send sge = %d > %d\n",
  63                         cap->max_send_sge, rxe->attr.max_sge);
  64                 goto err1;
  65         }
  66
  67         if (!has_srq) {
  68                 if (cap->max_recv_wr > rxe->attr.max_qp_wr) {
  69                         pr_warn("invalid recv wr = %d > %d\n",
  70                                 cap->max_recv_wr, rxe->attr.max_qp_wr);
  71                         goto err1;
  72                 }
  73
  74                 if (cap->max_recv_sge > rxe->attr.max_sge) {
  75                         pr_warn("invalid recv sge = %d > %d\n",
  76                                 cap->max_recv_sge, rxe->attr.max_sge);
  77                         goto err1;
  78                 }
  79         }
  80
  81         if (cap->max_inline_data > rxe->max_inline_data) {
  82                 pr_warn("invalid max inline data = %d > %d\n",
  83                         cap->max_inline_data, rxe->max_inline_data);
  84                 goto err1;
  85         }
  86
  87         return 0;
  88
  89 err1:
  90         return -EINVAL;
  91 }
  92
  93 int rxe_qp_chk_init(struct rxe_dev *rxe, struct ib_qp_init_attr *init)
  94 {
  95         struct ib_qp_cap *cap = &init->cap;
  96         struct rxe_port *port;
  97         int port_num = init->port_num;
  98
  99         if (!init->recv_cq || !init->send_cq) {
 100                 pr_warn("missing cq\n");
 101                 goto err1;
 102         }
 103
 104         if (rxe_qp_chk_cap(rxe, cap, !!init->srq))
 105                 goto err1;
 106
 107         if (init->qp_type == IB_QPT_SMI || init->qp_type == IB_QPT_GSI) {
 108                 if (port_num != 1) {
 109                         pr_warn("invalid port = %d\n", port_num);
 110                         goto err1;
 111                 }
 112
 113                 port = &rxe->port;
 114
 115                 if (init->qp_type == IB_QPT_SMI && port->qp_smi_index) {
 116                         pr_warn("SMI QP exists for port %d\n", port_num);
 117                         goto err1;
 118                 }
 119
 120                 if (init->qp_type == IB_QPT_GSI && port->qp_gsi_index) {
 121                         pr_warn("GSI QP exists for port %d\n", port_num);
 122                         goto err1;
 123                 }
 124         }
 125
 126         return 0;
 127
 128 err1:
 129         return -EINVAL;
 130 }
 131
 132 static int alloc_rd_atomic_resources(struct rxe_qp *qp, unsigned int n)
 133 {
 134         qp->resp.res_head = 0;
 135         qp->resp.res_tail = 0;
 136         qp->resp.resources = kcalloc(n, sizeof(struct resp_res), GFP_KERNEL);
 137
 138         if (!qp->resp.resources)
 139                 return -ENOMEM;
 140
 141         return 0;
 142 }
 143
 144 static void free_rd_atomic_resources(struct rxe_qp *qp)
 145 {
 146         if (qp->resp.resources) {
 147                 int i;
 148
 149                 for (i = 0; i < qp->attr.max_rd_atomic; i++) {
 150                         struct resp_res *res = &qp->resp.resources[i];
 151
 152                         free_rd_atomic_resource(qp, res);
 153                 }
 154                 kfree(qp->resp.resources);
 155                 qp->resp.resources = NULL;
 156         }
 157 }
 158
 159 void free_rd_atomic_resource(struct rxe_qp *qp, struct resp_res *res)
 160 {
 161         if (res->type == RXE_ATOMIC_MASK) {
 162                 rxe_drop_ref(qp);
 163                 kfree_skb(res->atomic.skb);
 164         } else if (res->type == RXE_READ_MASK) {
 165                 if (res->read.mr)
 166                         rxe_drop_ref(res->read.mr);
 167         }
 168         res->type = 0;
 169 }
 170
 171 static void cleanup_rd_atomic_resources(struct rxe_qp *qp)
 172 {
 173         int i;
 174         struct resp_res *res;
 175
 176         if (qp->resp.resources) {
 177                 for (i = 0; i < qp->attr.max_rd_atomic; i++) {
 178                         res = &qp->resp.resources[i];
 179                         free_rd_atomic_resource(qp, res);
 180                 }
 181         }
 182 }
 183
 184 static void rxe_qp_init_misc(struct rxe_dev *rxe, struct rxe_qp *qp,
 185                              struct ib_qp_init_attr *init)
 186 {
 187         struct rxe_port *port;
 188         u32 qpn;
 189
 190         qp->sq_sig_type         = init->sq_sig_type;
 191         qp->attr.path_mtu       = 1;
 192         qp->mtu                 = ib_mtu_enum_to_int(qp->attr.path_mtu);
 193
 194         qpn                     = qp->pelem.index;
 195         port                    = &rxe->port;
 196
 197         switch (init->qp_type) {
 198         case IB_QPT_SMI:
 199                 qp->ibqp.qp_num         = 0;
 200                 port->qp_smi_index      = qpn;
 201                 qp->attr.port_num       = init->port_num;
 202                 break;
 203
 204         case IB_QPT_GSI:
 205                 qp->ibqp.qp_num         = 1;
 206                 port->qp_gsi_index      = qpn;
 207                 qp->attr.port_num       = init->port_num;
 208                 break;
 209
 210         default:
 211                 qp->ibqp.qp_num         = qpn;
 212                 break;
 213         }
 214
 215         INIT_LIST_HEAD(&qp->grp_list);
 216
 217         skb_queue_head_init(&qp->send_pkts);
 218
 219         spin_lock_init(&qp->grp_lock);
 220         spin_lock_init(&qp->state_lock);
 221
 222         atomic_set(&qp->ssn, 0);
 223         atomic_set(&qp->skb_out, 0);
 224 }
 225
 226 static int rxe_qp_init_req(struct rxe_dev *rxe, struct rxe_qp *qp,
 227                            struct ib_qp_init_attr *init,
 228                            struct ib_ucontext *context, struct ib_udata *udata)
 229 {
 230         int err;
 231         int wqe_size;
 232
 233         err = sock_create_kern(&init_net, AF_INET, SOCK_DGRAM, 0, &qp->sk);
 234         if (err < 0)
 235                 return err;
 236         qp->sk->sk->sk_user_data = qp;
 237
 238         qp->sq.max_wr           = init->cap.max_send_wr;
 239         qp->sq.max_sge          = init->cap.max_send_sge;
 240         qp->sq.max_inline       = init->cap.max_inline_data;
 241
 242         wqe_size = max_t(int, sizeof(struct rxe_send_wqe) +
 243                          qp->sq.max_sge * sizeof(struct ib_sge),
 244                          sizeof(struct rxe_send_wqe) +
 245                          qp->sq.max_inline);
 246
 247         qp->sq.queue = rxe_queue_init(rxe,
 248                                       &qp->sq.max_wr,
 249                                       wqe_size);
 250         if (!qp->sq.queue)
 251                 return -ENOMEM;
 252
 253         err = do_mmap_info(rxe, udata, true,
 254                            context, qp->sq.queue->buf,
 255                            qp->sq.queue->buf_size, &qp->sq.queue->ip);
 256
 257         if (err) {
 258                 kvfree(qp->sq.queue->buf);
 259                 kfree(qp->sq.queue);
 260                 return err;
 261         }
 262
 263         qp->req.wqe_index       = producer_index(qp->sq.queue);
 264         qp->req.state           = QP_STATE_RESET;
 265         qp->req.opcode          = -1;
 266         qp->comp.opcode         = -1;
 267
 268         spin_lock_init(&qp->sq.sq_lock);
 269         skb_queue_head_init(&qp->req_pkts);
 270
 271         rxe_init_task(rxe, &qp->req.task, qp,
 272                       rxe_requester, "req");
 273         rxe_init_task(rxe, &qp->comp.task, qp,
 274                       rxe_completer, "comp");
 275
 276         init_timer(&qp->rnr_nak_timer);
 277         qp->rnr_nak_timer.function = rnr_nak_timer;
 278         qp->rnr_nak_timer.data = (unsigned long)qp;
 279
 280         init_timer(&qp->retrans_timer);
 281         qp->retrans_timer.function = retransmit_timer;
 282         qp->retrans_timer.data = (unsigned long)qp;
 283         qp->qp_timeout_jiffies = 0; /* Can't be set for UD/UC in modify_qp */
 284
 285         return 0;
 286 }
 287
 288 static int rxe_qp_init_resp(struct rxe_dev *rxe, struct rxe_qp *qp,
 289                             struct ib_qp_init_attr *init,
 290                             struct ib_ucontext *context, struct ib_udata *udata)
 291 {
 292         int err;
 293         int wqe_size;
 294
 295         if (!qp->srq) {
 296                 qp->rq.max_wr           = init->cap.max_recv_wr;
 297                 qp->rq.max_sge          = init->cap.max_recv_sge;
 298
 299                 wqe_size = rcv_wqe_size(qp->rq.max_sge);
 300
 301                 pr_debug("max_wr = %d, max_sge = %d, wqe_size = %d\n",
 302                          qp->rq.max_wr, qp->rq.max_sge, wqe_size);
 303
 304                 qp->rq.queue = rxe_queue_init(rxe,
 305                                               &qp->rq.max_wr,
 306                                               wqe_size);
 307                 if (!qp->rq.queue)
 308                         return -ENOMEM;
 309
 310                 err = do_mmap_info(rxe, udata, false, context,
 311                                    qp->rq.queue->buf,
 312                                    qp->rq.queue->buf_size,
 313                                    &qp->rq.queue->ip);
 314                 if (err) {
 315                         kvfree(qp->rq.queue->buf);
 316                         kfree(qp->rq.queue);
 317                         return err;
 318                 }
 319         }
 320
 321         spin_lock_init(&qp->rq.producer_lock);
 322         spin_lock_init(&qp->rq.consumer_lock);
 323
 324         skb_queue_head_init(&qp->resp_pkts);
 325
 326         rxe_init_task(rxe, &qp->resp.task, qp,
 327                       rxe_responder, "resp");
 328
 329         qp->resp.opcode         = OPCODE_NONE;
 330         qp->resp.msn            = 0;
 331         qp->resp.state          = QP_STATE_RESET;
 332
 333         return 0;
 334 }
 335
 336 /* called by the create qp verb */
 337 int rxe_qp_from_init(struct rxe_dev *rxe, struct rxe_qp *qp, struct rxe_pd *pd,
 338                      struct ib_qp_init_attr *init, struct ib_udata *udata,
 339                      struct ib_pd *ibpd)
 340 {
 341         int err;
 342         struct rxe_cq *rcq = to_rcq(init->recv_cq);
 343         struct rxe_cq *scq = to_rcq(init->send_cq);
 344         struct rxe_srq *srq = init->srq ? to_rsrq(init->srq) : NULL;
 345         struct ib_ucontext *context = udata ? ibpd->uobject->context : NULL;
 346
 347         rxe_add_ref(pd);
 348         rxe_add_ref(rcq);
 349         rxe_add_ref(scq);
 350         if (srq)
 351                 rxe_add_ref(srq);
 352
 353         qp->pd                  = pd;
 354         qp->rcq                 = rcq;
 355         qp->scq                 = scq;
 356         qp->srq                 = srq;
 357
 358         rxe_qp_init_misc(rxe, qp, init);
 359
 360         err = rxe_qp_init_req(rxe, qp, init, context, udata);
 361         if (err)
 362                 goto err1;
 363
 364         err = rxe_qp_init_resp(rxe, qp, init, context, udata);
 365         if (err)
 366                 goto err2;
 367
 368         qp->attr.qp_state = IB_QPS_RESET;
 369         qp->valid = 1;
 370
 371         return 0;
 372
 373 err2:
 374         rxe_queue_cleanup(qp->sq.queue);
 375 err1:
 376         if (srq)
 377                 rxe_drop_ref(srq);
 378         rxe_drop_ref(scq);
 379         rxe_drop_ref(rcq);
 380         rxe_drop_ref(pd);
 381
 382         return err;
 383 }
 384
 385 /* called by the query qp verb */
 386 int rxe_qp_to_init(struct rxe_qp *qp, struct ib_qp_init_attr *init)
 387 {
 388         init->event_handler             = qp->ibqp.event_handler;
 389         init->qp_context                = qp->ibqp.qp_context;
 390         init->send_cq                   = qp->ibqp.send_cq;
 391         init->recv_cq                   = qp->ibqp.recv_cq;
 392         init->srq                       = qp->ibqp.srq;
 393
 394         init->cap.max_send_wr           = qp->sq.max_wr;
 395         init->cap.max_send_sge          = qp->sq.max_sge;
 396         init->cap.max_inline_data       = qp->sq.max_inline;
 397
 398         if (!qp->srq) {
 399                 init->cap.max_recv_wr           = qp->rq.max_wr;
 400                 init->cap.max_recv_sge          = qp->rq.max_sge;
 401         }
 402
 403         init->sq_sig_type               = qp->sq_sig_type;
 404
 405         init->qp_type                   = qp->ibqp.qp_type;
 406         init->port_num                  = 1;
 407
 408         return 0;
 409 }
 410
 411 /* called by the modify qp verb, this routine checks all the parameters before
 412  * making any changes
 413  */
 414 int rxe_qp_chk_attr(struct rxe_dev *rxe, struct rxe_qp *qp,
 415                     struct ib_qp_attr *attr, int mask)
 416 {
 417         enum ib_qp_state cur_state = (mask & IB_QP_CUR_STATE) ?
 418                                         attr->cur_qp_state : qp->attr.qp_state;
 419         enum ib_qp_state new_state = (mask & IB_QP_STATE) ?
 420                                         attr->qp_state : cur_state;
 421
 422         if (!ib_modify_qp_is_ok(cur_state, new_state, qp_type(qp), mask,
 423                                 IB_LINK_LAYER_ETHERNET)) {
 424                 pr_warn("invalid mask or state for qp\n");
 425                 goto err1;
 426         }
 427
 428         if (mask & IB_QP_STATE) {
 429                 if (cur_state == IB_QPS_SQD) {
 430                         if (qp->req.state == QP_STATE_DRAIN &&
 431                             new_state != IB_QPS_ERR)
 432                                 goto err1;
 433                 }
 434         }
 435
 436         if (mask & IB_QP_PORT) {
 437                 if (attr->port_num != 1) {
 438                         pr_warn("invalid port %d\n", attr->port_num);
 439                         goto err1;
 440                 }
 441         }
 442
 443         if (mask & IB_QP_CAP && rxe_qp_chk_cap(rxe, &attr->cap, !!qp->srq))
 444                 goto err1;
 445
 446         if (mask & IB_QP_AV && rxe_av_chk_attr(rxe, &attr->ah_attr))
 447                 goto err1;
 448
 449         if (mask & IB_QP_ALT_PATH) {
 450                 if (rxe_av_chk_attr(rxe, &attr->alt_ah_attr))
 451                         goto err1;
 452                 if (attr->alt_port_num != 1) {
 453                         pr_warn("invalid alt port %d\n", attr->alt_port_num);
 454                         goto err1;
 455                 }
 456                 if (attr->alt_timeout > 31) {
 457                         pr_warn("invalid QP alt timeout %d > 31\n",
 458                                 attr->alt_timeout);
 459                         goto err1;
 460                 }
 461         }
 462
 463         if (mask & IB_QP_PATH_MTU) {
 464                 struct rxe_port *port = &rxe->port;
 465
 466                 enum ib_mtu max_mtu = port->attr.max_mtu;
 467                 enum ib_mtu mtu = attr->path_mtu;
 468
 469                 if (mtu > max_mtu) {
 470                         pr_debug("invalid mtu (%d) > (%d)\n",
 471                                  ib_mtu_enum_to_int(mtu),
 472                                  ib_mtu_enum_to_int(max_mtu));
 473                         goto err1;
 474                 }
 475         }
 476
 477         if (mask & IB_QP_MAX_QP_RD_ATOMIC) {
 478                 if (attr->max_rd_atomic > rxe->attr.max_qp_rd_atom) {
 479                         pr_warn("invalid max_rd_atomic %d > %d\n",
 480                                 attr->max_rd_atomic,
 481                                 rxe->attr.max_qp_rd_atom);
 482                         goto err1;
 483                 }
 484         }
 485
 486         if (mask & IB_QP_TIMEOUT) {
 487                 if (attr->timeout > 31) {
 488                         pr_warn("invalid QP timeout %d > 31\n",
 489                                 attr->timeout);
 490                         goto err1;
 491                 }
 492         }
 493
 494         return 0;
 495
 496 err1:
 497         return -EINVAL;
 498 }
 499
 500 /* move the qp to the reset state */
 501 static void rxe_qp_reset(struct rxe_qp *qp)
 502 {
 503         /* stop tasks from running */
 504         rxe_disable_task(&qp->resp.task);
 505
 506         /* stop request/comp */
 507         if (qp->sq.queue) {
 508                 if (qp_type(qp) == IB_QPT_RC)
 509                         rxe_disable_task(&qp->comp.task);
 510                 rxe_disable_task(&qp->req.task);
 511         }
 512
 513         /* move qp to the reset state */
 514         qp->req.state = QP_STATE_RESET;
 515         qp->resp.state = QP_STATE_RESET;
 516
 517         /* let state machines reset themselves drain work and packet queues
 518          * etc.
 519          */
 520         __rxe_do_task(&qp->resp.task);
 521
 522         if (qp->sq.queue) {
 523                 __rxe_do_task(&qp->comp.task);
 524                 __rxe_do_task(&qp->req.task);
 525         }
 526
 527         /* cleanup attributes */
 528         atomic_set(&qp->ssn, 0);
 529         qp->req.opcode = -1;
 530         qp->req.need_retry = 0;
 531         qp->req.noack_pkts = 0;
 532         qp->resp.msn = 0;
 533         qp->resp.opcode = -1;
 534         qp->resp.drop_msg = 0;
 535         qp->resp.goto_error = 0;
 536         qp->resp.sent_psn_nak = 0;
 537
 538         if (qp->resp.mr) {
 539                 rxe_drop_ref(qp->resp.mr);
 540                 qp->resp.mr = NULL;
 541         }
 542
 543         cleanup_rd_atomic_resources(qp);
 544
 545         /* reenable tasks */
 546         rxe_enable_task(&qp->resp.task);
 547
 548         if (qp->sq.queue) {
 549                 if (qp_type(qp) == IB_QPT_RC)
 550                         rxe_enable_task(&qp->comp.task);
 551
 552                 rxe_enable_task(&qp->req.task);
 553         }
 554 }
 555
 556 /* drain the send queue */
 557 static void rxe_qp_drain(struct rxe_qp *qp)
 558 {
 559         if (qp->sq.queue) {
 560                 if (qp->req.state != QP_STATE_DRAINED) {
 561                         qp->req.state = QP_STATE_DRAIN;
 562                         if (qp_type(qp) == IB_QPT_RC)
 563                                 rxe_run_task(&qp->comp.task, 1);
 564                         else
 565                                 __rxe_do_task(&qp->comp.task);
 566                         rxe_run_task(&qp->req.task, 1);
 567                 }
 568         }
 569 }
 570
 571 /* move the qp to the error state */
 572 void rxe_qp_error(struct rxe_qp *qp)
 573 {
 574         qp->req.state = QP_STATE_ERROR;
 575         qp->resp.state = QP_STATE_ERROR;
 576
 577         /* drain work and packet queues */
 578         rxe_run_task(&qp->resp.task, 1);
 579
 580         if (qp_type(qp) == IB_QPT_RC)
 581                 rxe_run_task(&qp->comp.task, 1);
 582         else
 583                 __rxe_do_task(&qp->comp.task);
 584         rxe_run_task(&qp->req.task, 1);
 585 }
 586
 587 /* called by the modify qp verb */
 588 int rxe_qp_from_attr(struct rxe_qp *qp, struct ib_qp_attr *attr, int mask,
 589                      struct ib_udata *udata)
 590 {
 591         int err;
 592         struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
 593         union ib_gid sgid;
 594         struct ib_gid_attr sgid_attr;
 595
 596         if (mask & IB_QP_MAX_QP_RD_ATOMIC) {
 597                 int max_rd_atomic = __roundup_pow_of_two(attr->max_rd_atomic);
 598
 599                 free_rd_atomic_resources(qp);
 600
 601                 err = alloc_rd_atomic_resources(qp, max_rd_atomic);
 602                 if (err)
 603                         return err;
 604
 605                 qp->attr.max_rd_atomic = max_rd_atomic;
 606                 atomic_set(&qp->req.rd_atomic, max_rd_atomic);
 607         }
 608
 609         if (mask & IB_QP_CUR_STATE)
 610                 qp->attr.cur_qp_state = attr->qp_state;
 611
 612         if (mask & IB_QP_EN_SQD_ASYNC_NOTIFY)
 613                 qp->attr.en_sqd_async_notify = attr->en_sqd_async_notify;
 614
 615         if (mask & IB_QP_ACCESS_FLAGS)
 616                 qp->attr.qp_access_flags = attr->qp_access_flags;
 617
 618         if (mask & IB_QP_PKEY_INDEX)
 619                 qp->attr.pkey_index = attr->pkey_index;
 620
 621         if (mask & IB_QP_PORT)
 622                 qp->attr.port_num = attr->port_num;
 623
 624         if (mask & IB_QP_QKEY)
 625                 qp->attr.qkey = attr->qkey;
 626
 627         if (mask & IB_QP_AV) {
 628                 ib_get_cached_gid(&rxe->ib_dev, 1,
 629                                   attr->ah_attr.grh.sgid_index, &sgid,
 630                                   &sgid_attr);
 631                 rxe_av_from_attr(rxe, attr->port_num, &qp->pri_av,
 632                                  &attr->ah_attr);
 633                 rxe_av_fill_ip_info(rxe, &qp->pri_av, &attr->ah_attr,
 634                                     &sgid_attr, &sgid);
 635                 if (sgid_attr.ndev)
 636                         dev_put(sgid_attr.ndev);
 637         }
 638
 639         if (mask & IB_QP_ALT_PATH) {
 640                 ib_get_cached_gid(&rxe->ib_dev, 1,
 641                                   attr->alt_ah_attr.grh.sgid_index, &sgid,
 642                                   &sgid_attr);
 643
 644                 rxe_av_from_attr(rxe, attr->alt_port_num, &qp->alt_av,
 645                                  &attr->alt_ah_attr);
 646                 rxe_av_fill_ip_info(rxe, &qp->alt_av, &attr->alt_ah_attr,
 647                                     &sgid_attr, &sgid);
 648                 if (sgid_attr.ndev)
 649                         dev_put(sgid_attr.ndev);
 650
 651                 qp->attr.alt_port_num = attr->alt_port_num;
 652                 qp->attr.alt_pkey_index = attr->alt_pkey_index;
 653                 qp->attr.alt_timeout = attr->alt_timeout;
 654         }
 655
 656         if (mask & IB_QP_PATH_MTU) {
 657                 qp->attr.path_mtu = attr->path_mtu;
 658                 qp->mtu = ib_mtu_enum_to_int(attr->path_mtu);
 659         }
 660
 661         if (mask & IB_QP_TIMEOUT) {
 662                 qp->attr.timeout = attr->timeout;
 663                 if (attr->timeout == 0) {
 664                         qp->qp_timeout_jiffies = 0;
 665                 } else {
 666                         /* According to the spec, timeout = 4.096 * 2 ^ attr->timeout [us] */
 667                         int j = nsecs_to_jiffies(4096ULL << attr->timeout);
 668
 669                         qp->qp_timeout_jiffies = j ? j : 1;
 670                 }
 671         }
 672
 673         if (mask & IB_QP_RETRY_CNT) {
 674                 qp->attr.retry_cnt = attr->retry_cnt;
 675                 qp->comp.retry_cnt = attr->retry_cnt;
 676                 pr_debug("set retry count = %d\n", attr->retry_cnt);
 677         }
 678
 679         if (mask & IB_QP_RNR_RETRY) {
 680                 qp->attr.rnr_retry = attr->rnr_retry;
 681                 qp->comp.rnr_retry = attr->rnr_retry;
 682                 pr_debug("set rnr retry count = %d\n", attr->rnr_retry);
 683         }
 684
 685         if (mask & IB_QP_RQ_PSN) {
 686                 qp->attr.rq_psn = (attr->rq_psn & BTH_PSN_MASK);
 687                 qp->resp.psn = qp->attr.rq_psn;
 688                 pr_debug("set resp psn = 0x%x\n", qp->resp.psn);
 689         }
 690
 691         if (mask & IB_QP_MIN_RNR_TIMER) {
 692                 qp->attr.min_rnr_timer = attr->min_rnr_timer;
 693                 pr_debug("set min rnr timer = 0x%x\n",
 694                          attr->min_rnr_timer);
 695         }
 696
 697         if (mask & IB_QP_SQ_PSN) {
 698                 qp->attr.sq_psn = (attr->sq_psn & BTH_PSN_MASK);
 699                 qp->req.psn = qp->attr.sq_psn;
 700                 qp->comp.psn = qp->attr.sq_psn;
 701                 pr_debug("set req psn = 0x%x\n", qp->req.psn);
 702         }
 703
 704         if (mask & IB_QP_MAX_DEST_RD_ATOMIC) {
 705                 qp->attr.max_dest_rd_atomic =
 706                         __roundup_pow_of_two(attr->max_dest_rd_atomic);
 707         }
 708
 709         if (mask & IB_QP_PATH_MIG_STATE)
 710                 qp->attr.path_mig_state = attr->path_mig_state;
 711
 712         if (mask & IB_QP_DEST_QPN)
 713                 qp->attr.dest_qp_num = attr->dest_qp_num;
 714
 715         if (mask & IB_QP_STATE) {
 716                 qp->attr.qp_state = attr->qp_state;
 717
 718                 switch (attr->qp_state) {
 719                 case IB_QPS_RESET:
 720                         pr_debug("qp state -> RESET\n");
 721                         rxe_qp_reset(qp);
 722                         break;
 723
 724                 case IB_QPS_INIT:
 725                         pr_debug("qp state -> INIT\n");
 726                         qp->req.state = QP_STATE_INIT;
 727                         qp->resp.state = QP_STATE_INIT;
 728                         break;
 729
 730                 case IB_QPS_RTR:
 731                         pr_debug("qp state -> RTR\n");
 732                         qp->resp.state = QP_STATE_READY;
 733                         break;
 734
 735                 case IB_QPS_RTS:
 736                         pr_debug("qp state -> RTS\n");
 737                         qp->req.state = QP_STATE_READY;
 738                         break;
 739
 740                 case IB_QPS_SQD:
 741                         pr_debug("qp state -> SQD\n");
 742                         rxe_qp_drain(qp);
 743                         break;
 744
 745                 case IB_QPS_SQE:
 746                         pr_warn("qp state -> SQE !!?\n");
 747                         /* Not possible from modify_qp. */
 748                         break;
 749
 750                 case IB_QPS_ERR:
 751                         pr_debug("qp state -> ERR\n");
 752                         rxe_qp_error(qp);
 753                         break;
 754                 }
 755         }
 756
 757         return 0;
 758 }
 759
 760 /* called by the query qp verb */
 761 int rxe_qp_to_attr(struct rxe_qp *qp, struct ib_qp_attr *attr, int mask)
 762 {
 763         struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
 764
 765         *attr = qp->attr;
 766
 767         attr->rq_psn                            = qp->resp.psn;
 768         attr->sq_psn                            = qp->req.psn;
 769
 770         attr->cap.max_send_wr                   = qp->sq.max_wr;
 771         attr->cap.max_send_sge                  = qp->sq.max_sge;
 772         attr->cap.max_inline_data               = qp->sq.max_inline;
 773
 774         if (!qp->srq) {
 775                 attr->cap.max_recv_wr           = qp->rq.max_wr;
 776                 attr->cap.max_recv_sge          = qp->rq.max_sge;
 777         }
 778
 779         rxe_av_to_attr(rxe, &qp->pri_av, &attr->ah_attr);
 780         rxe_av_to_attr(rxe, &qp->alt_av, &attr->alt_ah_attr);
 781
 782         if (qp->req.state == QP_STATE_DRAIN) {
 783                 attr->sq_draining = 1;
 784                 /* applications that get this state
 785                  * typically spin on it. yield the
 786                  * processor
 787                  */
 788                 cond_resched();
 789         } else {
 790                 attr->sq_draining = 0;
 791         }
 792
 793         pr_debug("attr->sq_draining = %d\n", attr->sq_draining);
 794
 795         return 0;
 796 }
 797
 798 /* called by the destroy qp verb */
 799 void rxe_qp_destroy(struct rxe_qp *qp)
 800 {
 801         qp->valid = 0;
 802         qp->qp_timeout_jiffies = 0;
 803         rxe_cleanup_task(&qp->resp.task);
 804
 805         del_timer_sync(&qp->retrans_timer);
 806         del_timer_sync(&qp->rnr_nak_timer);
 807
 808         rxe_cleanup_task(&qp->req.task);
 809         if (qp_type(qp) == IB_QPT_RC)
 810                 rxe_cleanup_task(&qp->comp.task);
 811
 812         /* flush out any receive wr's or pending requests */
 813         __rxe_do_task(&qp->req.task);
 814         if (qp->sq.queue) {
 815                 __rxe_do_task(&qp->comp.task);
 816                 __rxe_do_task(&qp->req.task);
 817         }
 818 }
 819
 820 /* called when the last reference to the qp is dropped */
 821 void rxe_qp_cleanup(void *arg)
 822 {
 823         struct rxe_qp *qp = arg;
 824
 825         rxe_drop_all_mcast_groups(qp);
 826
 827         if (qp->sq.queue)
 828                 rxe_queue_cleanup(qp->sq.queue);
 829
 830         if (qp->srq)
 831                 rxe_drop_ref(qp->srq);
 832
 833         if (qp->rq.queue)
 834                 rxe_queue_cleanup(qp->rq.queue);
 835
 836         if (qp->scq)
 837                 rxe_drop_ref(qp->scq);
 838         if (qp->rcq)
 839                 rxe_drop_ref(qp->rcq);
 840         if (qp->pd)
 841                 rxe_drop_ref(qp->pd);
 842
 843         if (qp->resp.mr) {
 844                 rxe_drop_ref(qp->resp.mr);
 845                 qp->resp.mr = NULL;
 846         }
 847
 848         free_rd_atomic_resources(qp);
 849
 850         kernel_sock_shutdown(qp->sk, SHUT_RDWR);
 851 }