drivers/infiniband/hw/vmw_pvrdma/pvrdma_qp.c

   1 /*
   2  * Copyright (c) 2012-2016 VMware, Inc.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of EITHER the GNU General Public License
   6  * version 2 as published by the Free Software Foundation or the BSD
   7  * 2-Clause License. This program is distributed in the hope that it
   8  * will be useful, but WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED
   9  * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
  10  * See the GNU General Public License version 2 for more details at
  11  * http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program available in the file COPYING in the main
  15  * directory of this source tree.
  16  *
  17  * The BSD 2-Clause License
  18  *
  19  *     Redistribution and use in source and binary forms, with or
  20  *     without modification, are permitted provided that the following
  21  *     conditions are met:
  22  *
  23  *      - Redistributions of source code must retain the above
  24  *        copyright notice, this list of conditions and the following
  25  *        disclaimer.
  26  *
  27  *      - Redistributions in binary form must reproduce the above
  28  *        copyright notice, this list of conditions and the following
  29  *        disclaimer in the documentation and/or other materials
  30  *        provided with the distribution.
  31  *
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  35  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  36  * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  37  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  38  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  39  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  40  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  41  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  42  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  43  * OF THE POSSIBILITY OF SUCH DAMAGE.
  44  */
  45
  46 #include <asm/page.h>
  47 #include <linux/io.h>
  48 #include <linux/wait.h>
  49 #include <rdma/ib_addr.h>
  50 #include <rdma/ib_smi.h>
  51 #include <rdma/ib_user_verbs.h>
  52
  53 #include "pvrdma.h"
  54
  55 static inline void get_cqs(struct pvrdma_qp *qp, struct pvrdma_cq **send_cq,
  56                            struct pvrdma_cq **recv_cq)
  57 {
  58         *send_cq = to_vcq(qp->ibqp.send_cq);
  59         *recv_cq = to_vcq(qp->ibqp.recv_cq);
  60 }
  61
  62 static void pvrdma_lock_cqs(struct pvrdma_cq *scq, struct pvrdma_cq *rcq,
  63                             unsigned long *scq_flags,
  64                             unsigned long *rcq_flags)
  65         __acquires(scq->cq_lock) __acquires(rcq->cq_lock)
  66 {
  67         if (scq == rcq) {
  68                 spin_lock_irqsave(&scq->cq_lock, *scq_flags);
  69                 __acquire(rcq->cq_lock);
  70         } else if (scq->cq_handle < rcq->cq_handle) {
  71                 spin_lock_irqsave(&scq->cq_lock, *scq_flags);
  72                 spin_lock_irqsave_nested(&rcq->cq_lock, *rcq_flags,
  73                                          SINGLE_DEPTH_NESTING);
  74         } else {
  75                 spin_lock_irqsave(&rcq->cq_lock, *rcq_flags);
  76                 spin_lock_irqsave_nested(&scq->cq_lock, *scq_flags,
  77                                          SINGLE_DEPTH_NESTING);
  78         }
  79 }
  80
  81 static void pvrdma_unlock_cqs(struct pvrdma_cq *scq, struct pvrdma_cq *rcq,
  82                               unsigned long *scq_flags,
  83                               unsigned long *rcq_flags)
  84         __releases(scq->cq_lock) __releases(rcq->cq_lock)
  85 {
  86         if (scq == rcq) {
  87                 __release(rcq->cq_lock);
  88                 spin_unlock_irqrestore(&scq->cq_lock, *scq_flags);
  89         } else if (scq->cq_handle < rcq->cq_handle) {
  90                 spin_unlock_irqrestore(&rcq->cq_lock, *rcq_flags);
  91                 spin_unlock_irqrestore(&scq->cq_lock, *scq_flags);
  92         } else {
  93                 spin_unlock_irqrestore(&scq->cq_lock, *scq_flags);
  94                 spin_unlock_irqrestore(&rcq->cq_lock, *rcq_flags);
  95         }
  96 }
  97
  98 static void pvrdma_reset_qp(struct pvrdma_qp *qp)
  99 {
 100         struct pvrdma_cq *scq, *rcq;
 101         unsigned long scq_flags, rcq_flags;
 102
 103         /* Clean up cqes */
 104         get_cqs(qp, &scq, &rcq);
 105         pvrdma_lock_cqs(scq, rcq, &scq_flags, &rcq_flags);
 106
 107         _pvrdma_flush_cqe(qp, scq);
 108         if (scq != rcq)
 109                 _pvrdma_flush_cqe(qp, rcq);
 110
 111         pvrdma_unlock_cqs(scq, rcq, &scq_flags, &rcq_flags);
 112
 113         /*
 114          * Reset queuepair. The checks are because usermode queuepairs won't
 115          * have kernel ringstates.
 116          */
 117         if (qp->rq.ring) {
 118                 atomic_set(&qp->rq.ring->cons_head, 0);
 119                 atomic_set(&qp->rq.ring->prod_tail, 0);
 120         }
 121         if (qp->sq.ring) {
 122                 atomic_set(&qp->sq.ring->cons_head, 0);
 123                 atomic_set(&qp->sq.ring->prod_tail, 0);
 124         }
 125 }
 126
 127 static int pvrdma_set_rq_size(struct pvrdma_dev *dev,
 128                               struct ib_qp_cap *req_cap,
 129                               struct pvrdma_qp *qp)
 130 {
 131         if (req_cap->max_recv_wr > dev->dsr->caps.max_qp_wr ||
 132             req_cap->max_recv_sge > dev->dsr->caps.max_sge) {
 133                 dev_warn(&dev->pdev->dev, "recv queue size invalid\n");
 134                 return -EINVAL;
 135         }
 136
 137         qp->rq.wqe_cnt = roundup_pow_of_two(max(1U, req_cap->max_recv_wr));
 138         qp->rq.max_sg = roundup_pow_of_two(max(1U, req_cap->max_recv_sge));
 139
 140         /* Write back */
 141         req_cap->max_recv_wr = qp->rq.wqe_cnt;
 142         req_cap->max_recv_sge = qp->rq.max_sg;
 143
 144         qp->rq.wqe_size = roundup_pow_of_two(sizeof(struct pvrdma_rq_wqe_hdr) +
 145                                              sizeof(struct pvrdma_sge) *
 146                                              qp->rq.max_sg);
 147         qp->npages_recv = (qp->rq.wqe_cnt * qp->rq.wqe_size + PAGE_SIZE - 1) /
 148                           PAGE_SIZE;
 149
 150         return 0;
 151 }
 152
 153 static int pvrdma_set_sq_size(struct pvrdma_dev *dev, struct ib_qp_cap *req_cap,
 154                               struct pvrdma_qp *qp)
 155 {
 156         if (req_cap->max_send_wr > dev->dsr->caps.max_qp_wr ||
 157             req_cap->max_send_sge > dev->dsr->caps.max_sge) {
 158                 dev_warn(&dev->pdev->dev, "send queue size invalid\n");
 159                 return -EINVAL;
 160         }
 161
 162         qp->sq.wqe_cnt = roundup_pow_of_two(max(1U, req_cap->max_send_wr));
 163         qp->sq.max_sg = roundup_pow_of_two(max(1U, req_cap->max_send_sge));
 164
 165         /* Write back */
 166         req_cap->max_send_wr = qp->sq.wqe_cnt;
 167         req_cap->max_send_sge = qp->sq.max_sg;
 168
 169         qp->sq.wqe_size = roundup_pow_of_two(sizeof(struct pvrdma_sq_wqe_hdr) +
 170                                              sizeof(struct pvrdma_sge) *
 171                                              qp->sq.max_sg);
 172         /* Note: one extra page for the header. */
 173         qp->npages_send = 1 + (qp->sq.wqe_cnt * qp->sq.wqe_size +
 174                                PAGE_SIZE - 1) / PAGE_SIZE;
 175
 176         return 0;
 177 }
 178
 179 /**
 180  * pvrdma_create_qp - create queue pair
 181  * @pd: protection domain
 182  * @init_attr: queue pair attributes
 183  * @udata: user data
 184  *
 185  * @return: the ib_qp pointer on success, otherwise returns an errno.
 186  */
 187 struct ib_qp *pvrdma_create_qp(struct ib_pd *pd,
 188                                struct ib_qp_init_attr *init_attr,
 189                                struct ib_udata *udata)
 190 {
 191         struct pvrdma_qp *qp = NULL;
 192         struct pvrdma_dev *dev = to_vdev(pd->device);
 193         union pvrdma_cmd_req req;
 194         union pvrdma_cmd_resp rsp;
 195         struct pvrdma_cmd_create_qp *cmd = &req.create_qp;
 196         struct pvrdma_cmd_create_qp_resp *resp = &rsp.create_qp_resp;
 197         struct pvrdma_create_qp ucmd;
 198         unsigned long flags;
 199         int ret;
 200
 201         if (init_attr->create_flags) {
 202                 dev_warn(&dev->pdev->dev,
 203                          "invalid create queuepair flags %#x\n",
 204                          init_attr->create_flags);
 205                 return ERR_PTR(-EINVAL);
 206         }
 207
 208         if (init_attr->qp_type != IB_QPT_RC &&
 209             init_attr->qp_type != IB_QPT_UD &&
 210             init_attr->qp_type != IB_QPT_GSI) {
 211                 dev_warn(&dev->pdev->dev, "queuepair type %d not supported\n",
 212                          init_attr->qp_type);
 213                 return ERR_PTR(-EINVAL);
 214         }
 215
 216         if (!atomic_add_unless(&dev->num_qps, 1, dev->dsr->caps.max_qp))
 217                 return ERR_PTR(-ENOMEM);
 218
 219         switch (init_attr->qp_type) {
 220         case IB_QPT_GSI:
 221                 if (init_attr->port_num == 0 ||
 222                     init_attr->port_num > pd->device->phys_port_cnt ||
 223                     udata) {
 224                         dev_warn(&dev->pdev->dev, "invalid queuepair attrs\n");
 225                         ret = -EINVAL;
 226                         goto err_qp;
 227                 }
 228                 /* fall through */
 229         case IB_QPT_RC:
 230         case IB_QPT_UD:
 231                 qp = kzalloc(sizeof(*qp), GFP_KERNEL);
 232                 if (!qp) {
 233                         ret = -ENOMEM;
 234                         goto err_qp;
 235                 }
 236
 237                 spin_lock_init(&qp->sq.lock);
 238                 spin_lock_init(&qp->rq.lock);
 239                 mutex_init(&qp->mutex);
 240                 atomic_set(&qp->refcnt, 1);
 241                 init_waitqueue_head(&qp->wait);
 242
 243                 qp->state = IB_QPS_RESET;
 244
 245                 if (pd->uobject && udata) {
 246                         dev_dbg(&dev->pdev->dev,
 247                                 "create queuepair from user space\n");
 248
 249                         if (ib_copy_from_udata(&ucmd, udata, sizeof(ucmd))) {
 250                                 ret = -EFAULT;
 251                                 goto err_qp;
 252                         }
 253
 254                         /* set qp->sq.wqe_cnt, shift, buf_size.. */
 255                         qp->rumem = ib_umem_get(pd->uobject->context,
 256                                                 ucmd.rbuf_addr,
 257                                                 ucmd.rbuf_size, 0, 0);
 258                         if (IS_ERR(qp->rumem)) {
 259                                 ret = PTR_ERR(qp->rumem);
 260                                 goto err_qp;
 261                         }
 262
 263                         qp->sumem = ib_umem_get(pd->uobject->context,
 264                                                 ucmd.sbuf_addr,
 265                                                 ucmd.sbuf_size, 0, 0);
 266                         if (IS_ERR(qp->sumem)) {
 267                                 ib_umem_release(qp->rumem);
 268                                 ret = PTR_ERR(qp->sumem);
 269                                 goto err_qp;
 270                         }
 271
 272                         qp->npages_send = ib_umem_page_count(qp->sumem);
 273                         qp->npages_recv = ib_umem_page_count(qp->rumem);
 274                         qp->npages = qp->npages_send + qp->npages_recv;
 275                 } else {
 276                         qp->is_kernel = true;
 277
 278                         ret = pvrdma_set_sq_size(to_vdev(pd->device),
 279                                                  &init_attr->cap, qp);
 280                         if (ret)
 281                                 goto err_qp;
 282
 283                         ret = pvrdma_set_rq_size(to_vdev(pd->device),
 284                                                  &init_attr->cap, qp);
 285                         if (ret)
 286                                 goto err_qp;
 287
 288                         qp->npages = qp->npages_send + qp->npages_recv;
 289
 290                         /* Skip header page. */
 291                         qp->sq.offset = PAGE_SIZE;
 292
 293                         /* Recv queue pages are after send pages. */
 294                         qp->rq.offset = qp->npages_send * PAGE_SIZE;
 295                 }
 296
 297                 if (qp->npages < 0 || qp->npages > PVRDMA_PAGE_DIR_MAX_PAGES) {
 298                         dev_warn(&dev->pdev->dev,
 299                                  "overflow pages in queuepair\n");
 300                         ret = -EINVAL;
 301                         goto err_umem;
 302                 }
 303
 304                 ret = pvrdma_page_dir_init(dev, &qp->pdir, qp->npages,
 305                                            qp->is_kernel);
 306                 if (ret) {
 307                         dev_warn(&dev->pdev->dev,
 308                                  "could not allocate page directory\n");
 309                         goto err_umem;
 310                 }
 311
 312                 if (!qp->is_kernel) {
 313                         pvrdma_page_dir_insert_umem(&qp->pdir, qp->sumem, 0);
 314                         pvrdma_page_dir_insert_umem(&qp->pdir, qp->rumem,
 315                                                     qp->npages_send);
 316                 } else {
 317                         /* Ring state is always the first page. */
 318                         qp->sq.ring = qp->pdir.pages[0];
 319                         qp->rq.ring = &qp->sq.ring[1];
 320                 }
 321                 break;
 322         default:
 323                 ret = -EINVAL;
 324                 goto err_qp;
 325         }
 326
 327         /* Not supported */
 328         init_attr->cap.max_inline_data = 0;
 329
 330         memset(cmd, 0, sizeof(*cmd));
 331         cmd->hdr.cmd = PVRDMA_CMD_CREATE_QP;
 332         cmd->pd_handle = to_vpd(pd)->pd_handle;
 333         cmd->send_cq_handle = to_vcq(init_attr->send_cq)->cq_handle;
 334         cmd->recv_cq_handle = to_vcq(init_attr->recv_cq)->cq_handle;
 335         cmd->max_send_wr = init_attr->cap.max_send_wr;
 336         cmd->max_recv_wr = init_attr->cap.max_recv_wr;
 337         cmd->max_send_sge = init_attr->cap.max_send_sge;
 338         cmd->max_recv_sge = init_attr->cap.max_recv_sge;
 339         cmd->max_inline_data = init_attr->cap.max_inline_data;
 340         cmd->sq_sig_all = (init_attr->sq_sig_type == IB_SIGNAL_ALL_WR) ? 1 : 0;
 341         cmd->qp_type = ib_qp_type_to_pvrdma(init_attr->qp_type);
 342         cmd->access_flags = IB_ACCESS_LOCAL_WRITE;
 343         cmd->total_chunks = qp->npages;
 344         cmd->send_chunks = qp->npages_send - 1;
 345         cmd->pdir_dma = qp->pdir.dir_dma;
 346
 347         dev_dbg(&dev->pdev->dev, "create queuepair with %d, %d, %d, %d\n",
 348                 cmd->max_send_wr, cmd->max_recv_wr, cmd->max_send_sge,
 349                 cmd->max_recv_sge);
 350
 351         ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_QP_RESP);
 352         if (ret < 0) {
 353                 dev_warn(&dev->pdev->dev,
 354                          "could not create queuepair, error: %d\n", ret);
 355                 goto err_pdir;
 356         }
 357
 358         /* max_send_wr/_recv_wr/_send_sge/_recv_sge/_inline_data */
 359         qp->qp_handle = resp->qpn;
 360         qp->port = init_attr->port_num;
 361         qp->ibqp.qp_num = resp->qpn;
 362         spin_lock_irqsave(&dev->qp_tbl_lock, flags);
 363         dev->qp_tbl[qp->qp_handle % dev->dsr->caps.max_qp] = qp;
 364         spin_unlock_irqrestore(&dev->qp_tbl_lock, flags);
 365
 366         return &qp->ibqp;
 367
 368 err_pdir:
 369         pvrdma_page_dir_cleanup(dev, &qp->pdir);
 370 err_umem:
 371         if (pd->uobject && udata) {
 372                 if (qp->rumem)
 373                         ib_umem_release(qp->rumem);
 374                 if (qp->sumem)
 375                         ib_umem_release(qp->sumem);
 376         }
 377 err_qp:
 378         kfree(qp);
 379         atomic_dec(&dev->num_qps);
 380
 381         return ERR_PTR(ret);
 382 }
 383
 384 static void pvrdma_free_qp(struct pvrdma_qp *qp)
 385 {
 386         struct pvrdma_dev *dev = to_vdev(qp->ibqp.device);
 387         struct pvrdma_cq *scq;
 388         struct pvrdma_cq *rcq;
 389         unsigned long flags, scq_flags, rcq_flags;
 390
 391         /* In case cq is polling */
 392         get_cqs(qp, &scq, &rcq);
 393         pvrdma_lock_cqs(scq, rcq, &scq_flags, &rcq_flags);
 394
 395         _pvrdma_flush_cqe(qp, scq);
 396         if (scq != rcq)
 397                 _pvrdma_flush_cqe(qp, rcq);
 398
 399         spin_lock_irqsave(&dev->qp_tbl_lock, flags);
 400         dev->qp_tbl[qp->qp_handle] = NULL;
 401         spin_unlock_irqrestore(&dev->qp_tbl_lock, flags);
 402
 403         pvrdma_unlock_cqs(scq, rcq, &scq_flags, &rcq_flags);
 404
 405         atomic_dec(&qp->refcnt);
 406         wait_event(qp->wait, !atomic_read(&qp->refcnt));
 407
 408         pvrdma_page_dir_cleanup(dev, &qp->pdir);
 409
 410         kfree(qp);
 411
 412         atomic_dec(&dev->num_qps);
 413 }
 414
 415 /**
 416  * pvrdma_destroy_qp - destroy a queue pair
 417  * @qp: the queue pair to destroy
 418  *
 419  * @return: 0 on success.
 420  */
 421 int pvrdma_destroy_qp(struct ib_qp *qp)
 422 {
 423         struct pvrdma_qp *vqp = to_vqp(qp);
 424         union pvrdma_cmd_req req;
 425         struct pvrdma_cmd_destroy_qp *cmd = &req.destroy_qp;
 426         int ret;
 427
 428         memset(cmd, 0, sizeof(*cmd));
 429         cmd->hdr.cmd = PVRDMA_CMD_DESTROY_QP;
 430         cmd->qp_handle = vqp->qp_handle;
 431
 432         ret = pvrdma_cmd_post(to_vdev(qp->device), &req, NULL, 0);
 433         if (ret < 0)
 434                 dev_warn(&to_vdev(qp->device)->pdev->dev,
 435                          "destroy queuepair failed, error: %d\n", ret);
 436
 437         pvrdma_free_qp(vqp);
 438
 439         return 0;
 440 }
 441
 442 /**
 443  * pvrdma_modify_qp - modify queue pair attributes
 444  * @ibqp: the queue pair
 445  * @attr: the new queue pair's attributes
 446  * @attr_mask: attributes mask
 447  * @udata: user data
 448  *
 449  * @returns 0 on success, otherwise returns an errno.
 450  */
 451 int pvrdma_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
 452                      int attr_mask, struct ib_udata *udata)
 453 {
 454         struct pvrdma_dev *dev = to_vdev(ibqp->device);
 455         struct pvrdma_qp *qp = to_vqp(ibqp);
 456         union pvrdma_cmd_req req;
 457         union pvrdma_cmd_resp rsp;
 458         struct pvrdma_cmd_modify_qp *cmd = &req.modify_qp;
 459         int cur_state, next_state;
 460         int ret;
 461
 462         /* Sanity checking. Should need lock here */
 463         mutex_lock(&qp->mutex);
 464         cur_state = (attr_mask & IB_QP_CUR_STATE) ? attr->cur_qp_state :
 465                 qp->state;
 466         next_state = (attr_mask & IB_QP_STATE) ? attr->qp_state : cur_state;
 467
 468         if (!ib_modify_qp_is_ok(cur_state, next_state, ibqp->qp_type,
 469                                 attr_mask, IB_LINK_LAYER_ETHERNET)) {
 470                 ret = -EINVAL;
 471                 goto out;
 472         }
 473
 474         if (attr_mask & IB_QP_PORT) {
 475                 if (attr->port_num == 0 ||
 476                     attr->port_num > ibqp->device->phys_port_cnt) {
 477                         ret = -EINVAL;
 478                         goto out;
 479                 }
 480         }
 481
 482         if (attr_mask & IB_QP_MIN_RNR_TIMER) {
 483                 if (attr->min_rnr_timer > 31) {
 484                         ret = -EINVAL;
 485                         goto out;
 486                 }
 487         }
 488
 489         if (attr_mask & IB_QP_PKEY_INDEX) {
 490                 if (attr->pkey_index >= dev->dsr->caps.max_pkeys) {
 491                         ret = -EINVAL;
 492                         goto out;
 493                 }
 494         }
 495
 496         if (attr_mask & IB_QP_QKEY)
 497                 qp->qkey = attr->qkey;
 498
 499         if (cur_state == next_state && cur_state == IB_QPS_RESET) {
 500                 ret = 0;
 501                 goto out;
 502         }
 503
 504         qp->state = next_state;
 505         memset(cmd, 0, sizeof(*cmd));
 506         cmd->hdr.cmd = PVRDMA_CMD_MODIFY_QP;
 507         cmd->qp_handle = qp->qp_handle;
 508         cmd->attr_mask = ib_qp_attr_mask_to_pvrdma(attr_mask);
 509         cmd->attrs.qp_state = ib_qp_state_to_pvrdma(attr->qp_state);
 510         cmd->attrs.cur_qp_state =
 511                 ib_qp_state_to_pvrdma(attr->cur_qp_state);
 512         cmd->attrs.path_mtu = ib_mtu_to_pvrdma(attr->path_mtu);
 513         cmd->attrs.path_mig_state =
 514                 ib_mig_state_to_pvrdma(attr->path_mig_state);
 515         cmd->attrs.qkey = attr->qkey;
 516         cmd->attrs.rq_psn = attr->rq_psn;
 517         cmd->attrs.sq_psn = attr->sq_psn;
 518         cmd->attrs.dest_qp_num = attr->dest_qp_num;
 519         cmd->attrs.qp_access_flags =
 520                 ib_access_flags_to_pvrdma(attr->qp_access_flags);
 521         cmd->attrs.pkey_index = attr->pkey_index;
 522         cmd->attrs.alt_pkey_index = attr->alt_pkey_index;
 523         cmd->attrs.en_sqd_async_notify = attr->en_sqd_async_notify;
 524         cmd->attrs.sq_draining = attr->sq_draining;
 525         cmd->attrs.max_rd_atomic = attr->max_rd_atomic;
 526         cmd->attrs.max_dest_rd_atomic = attr->max_dest_rd_atomic;
 527         cmd->attrs.min_rnr_timer = attr->min_rnr_timer;
 528         cmd->attrs.port_num = attr->port_num;
 529         cmd->attrs.timeout = attr->timeout;
 530         cmd->attrs.retry_cnt = attr->retry_cnt;
 531         cmd->attrs.rnr_retry = attr->rnr_retry;
 532         cmd->attrs.alt_port_num = attr->alt_port_num;
 533         cmd->attrs.alt_timeout = attr->alt_timeout;
 534         ib_qp_cap_to_pvrdma(&cmd->attrs.cap, &attr->cap);
 535         ib_ah_attr_to_pvrdma(&cmd->attrs.ah_attr, &attr->ah_attr);
 536         ib_ah_attr_to_pvrdma(&cmd->attrs.alt_ah_attr, &attr->alt_ah_attr);
 537
 538         ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_MODIFY_QP_RESP);
 539         if (ret < 0) {
 540                 dev_warn(&dev->pdev->dev,
 541                          "could not modify queuepair, error: %d\n", ret);
 542         } else if (rsp.hdr.err > 0) {
 543                 dev_warn(&dev->pdev->dev,
 544                          "cannot modify queuepair, error: %d\n", rsp.hdr.err);
 545                 ret = -EINVAL;
 546         }
 547
 548         if (ret == 0 && next_state == IB_QPS_RESET)
 549                 pvrdma_reset_qp(qp);
 550
 551 out:
 552         mutex_unlock(&qp->mutex);
 553
 554         return ret;
 555 }
 556
 557 static inline void *get_sq_wqe(struct pvrdma_qp *qp, int n)
 558 {
 559         return pvrdma_page_dir_get_ptr(&qp->pdir,
 560                                        qp->sq.offset + n * qp->sq.wqe_size);
 561 }
 562
 563 static inline void *get_rq_wqe(struct pvrdma_qp *qp, int n)
 564 {
 565         return pvrdma_page_dir_get_ptr(&qp->pdir,
 566                                        qp->rq.offset + n * qp->rq.wqe_size);
 567 }
 568
 569 static int set_reg_seg(struct pvrdma_sq_wqe_hdr *wqe_hdr, struct ib_reg_wr *wr)
 570 {
 571         struct pvrdma_user_mr *mr = to_vmr(wr->mr);
 572
 573         wqe_hdr->wr.fast_reg.iova_start = mr->ibmr.iova;
 574         wqe_hdr->wr.fast_reg.pl_pdir_dma = mr->pdir.dir_dma;
 575         wqe_hdr->wr.fast_reg.page_shift = mr->page_shift;
 576         wqe_hdr->wr.fast_reg.page_list_len = mr->npages;
 577         wqe_hdr->wr.fast_reg.length = mr->ibmr.length;
 578         wqe_hdr->wr.fast_reg.access_flags = wr->access;
 579         wqe_hdr->wr.fast_reg.rkey = wr->key;
 580
 581         return pvrdma_page_dir_insert_page_list(&mr->pdir, mr->pages,
 582                                                 mr->npages);
 583 }
 584
 585 /**
 586  * pvrdma_post_send - post send work request entries on a QP
 587  * @ibqp: the QP
 588  * @wr: work request list to post
 589  * @bad_wr: the first bad WR returned
 590  *
 591  * @return: 0 on success, otherwise errno returned.
 592  */
 593 int pvrdma_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
 594                      struct ib_send_wr **bad_wr)
 595 {
 596         struct pvrdma_qp *qp = to_vqp(ibqp);
 597         struct pvrdma_dev *dev = to_vdev(ibqp->device);
 598         unsigned long flags;
 599         struct pvrdma_sq_wqe_hdr *wqe_hdr;
 600         struct pvrdma_sge *sge;
 601         int i, index;
 602         int nreq;
 603         int ret;
 604
 605         /*
 606          * In states lower than RTS, we can fail immediately. In other states,
 607          * just post and let the device figure it out.
 608          */
 609         if (qp->state < IB_QPS_RTS) {
 610                 *bad_wr = wr;
 611                 return -EINVAL;
 612         }
 613
 614         spin_lock_irqsave(&qp->sq.lock, flags);
 615
 616         index = pvrdma_idx(&qp->sq.ring->prod_tail, qp->sq.wqe_cnt);
 617         for (nreq = 0; wr; nreq++, wr = wr->next) {
 618                 unsigned int tail;
 619
 620                 if (unlikely(!pvrdma_idx_ring_has_space(
 621                                 qp->sq.ring, qp->sq.wqe_cnt, &tail))) {
 622                         dev_warn_ratelimited(&dev->pdev->dev,
 623                                              "send queue is full\n");
 624                         *bad_wr = wr;
 625                         ret = -ENOMEM;
 626                         goto out;
 627                 }
 628
 629                 if (unlikely(wr->num_sge > qp->sq.max_sg || wr->num_sge < 0)) {
 630                         dev_warn_ratelimited(&dev->pdev->dev,
 631                                              "send SGE overflow\n");
 632                         *bad_wr = wr;
 633                         ret = -EINVAL;
 634                         goto out;
 635                 }
 636
 637                 if (unlikely(wr->opcode < 0)) {
 638                         dev_warn_ratelimited(&dev->pdev->dev,
 639                                              "invalid send opcode\n");
 640                         *bad_wr = wr;
 641                         ret = -EINVAL;
 642                         goto out;
 643                 }
 644
 645                 /*
 646                  * Only support UD, RC.
 647                  * Need to check opcode table for thorough checking.
 648                  * opcode               _UD     _UC     _RC
 649                  * _SEND                x       x       x
 650                  * _SEND_WITH_IMM       x       x       x
 651                  * _RDMA_WRITE                  x       x
 652                  * _RDMA_WRITE_WITH_IMM         x       x
 653                  * _LOCAL_INV                   x       x
 654                  * _SEND_WITH_INV               x       x
 655                  * _RDMA_READ                           x
 656                  * _ATOMIC_CMP_AND_SWP                  x
 657                  * _ATOMIC_FETCH_AND_ADD                x
 658                  * _MASK_ATOMIC_CMP_AND_SWP             x
 659                  * _MASK_ATOMIC_FETCH_AND_ADD           x
 660                  * _REG_MR                              x
 661                  *
 662                  */
 663                 if (qp->ibqp.qp_type != IB_QPT_UD &&
 664                     qp->ibqp.qp_type != IB_QPT_RC &&
 665                         wr->opcode != IB_WR_SEND) {
 666                         dev_warn_ratelimited(&dev->pdev->dev,
 667                                              "unsupported queuepair type\n");
 668                         *bad_wr = wr;
 669                         ret = -EINVAL;
 670                         goto out;
 671                 } else if (qp->ibqp.qp_type == IB_QPT_UD ||
 672                            qp->ibqp.qp_type == IB_QPT_GSI) {
 673                         if (wr->opcode != IB_WR_SEND &&
 674                             wr->opcode != IB_WR_SEND_WITH_IMM) {
 675                                 dev_warn_ratelimited(&dev->pdev->dev,
 676                                                      "invalid send opcode\n");
 677                                 *bad_wr = wr;
 678                                 ret = -EINVAL;
 679                                 goto out;
 680                         }
 681                 }
 682
 683                 wqe_hdr = (struct pvrdma_sq_wqe_hdr *)get_sq_wqe(qp, index);
 684                 memset(wqe_hdr, 0, sizeof(*wqe_hdr));
 685                 wqe_hdr->wr_id = wr->wr_id;
 686                 wqe_hdr->num_sge = wr->num_sge;
 687                 wqe_hdr->opcode = ib_wr_opcode_to_pvrdma(wr->opcode);
 688                 wqe_hdr->send_flags = ib_send_flags_to_pvrdma(wr->send_flags);
 689                 if (wr->opcode == IB_WR_SEND_WITH_IMM ||
 690                     wr->opcode == IB_WR_RDMA_WRITE_WITH_IMM)
 691                         wqe_hdr->ex.imm_data = wr->ex.imm_data;
 692
 693                 switch (qp->ibqp.qp_type) {
 694                 case IB_QPT_GSI:
 695                 case IB_QPT_UD:
 696                         if (unlikely(!ud_wr(wr)->ah)) {
 697                                 dev_warn_ratelimited(&dev->pdev->dev,
 698                                                      "invalid address handle\n");
 699                                 *bad_wr = wr;
 700                                 ret = -EINVAL;
 701                                 goto out;
 702                         }
 703
 704                         /*
 705                          * Use qkey from qp context if high order bit set,
 706                          * otherwise from work request.
 707                          */
 708                         wqe_hdr->wr.ud.remote_qpn = ud_wr(wr)->remote_qpn;
 709                         wqe_hdr->wr.ud.remote_qkey =
 710                                 ud_wr(wr)->remote_qkey & 0x80000000 ?
 711                                 qp->qkey : ud_wr(wr)->remote_qkey;
 712                         wqe_hdr->wr.ud.av = to_vah(ud_wr(wr)->ah)->av;
 713
 714                         break;
 715                 case IB_QPT_RC:
 716                         switch (wr->opcode) {
 717                         case IB_WR_RDMA_READ:
 718                         case IB_WR_RDMA_WRITE:
 719                         case IB_WR_RDMA_WRITE_WITH_IMM:
 720                                 wqe_hdr->wr.rdma.remote_addr =
 721                                         rdma_wr(wr)->remote_addr;
 722                                 wqe_hdr->wr.rdma.rkey = rdma_wr(wr)->rkey;
 723                                 break;
 724                         case IB_WR_LOCAL_INV:
 725                         case IB_WR_SEND_WITH_INV:
 726                                 wqe_hdr->ex.invalidate_rkey =
 727                                         wr->ex.invalidate_rkey;
 728                                 break;
 729                         case IB_WR_ATOMIC_CMP_AND_SWP:
 730                         case IB_WR_ATOMIC_FETCH_AND_ADD:
 731                                 wqe_hdr->wr.atomic.remote_addr =
 732                                         atomic_wr(wr)->remote_addr;
 733                                 wqe_hdr->wr.atomic.rkey = atomic_wr(wr)->rkey;
 734                                 wqe_hdr->wr.atomic.compare_add =
 735                                         atomic_wr(wr)->compare_add;
 736                                 if (wr->opcode == IB_WR_ATOMIC_CMP_AND_SWP)
 737                                         wqe_hdr->wr.atomic.swap =
 738                                                 atomic_wr(wr)->swap;
 739                                 break;
 740                         case IB_WR_REG_MR:
 741                                 ret = set_reg_seg(wqe_hdr, reg_wr(wr));
 742                                 if (ret < 0) {
 743                                         dev_warn_ratelimited(&dev->pdev->dev,
 744                                                              "Failed to set fast register work request\n");
 745                                         *bad_wr = wr;
 746                                         goto out;
 747                                 }
 748                                 break;
 749                         default:
 750                                 break;
 751                         }
 752
 753                         break;
 754                 default:
 755                         dev_warn_ratelimited(&dev->pdev->dev,
 756                                              "invalid queuepair type\n");
 757                         ret = -EINVAL;
 758                         *bad_wr = wr;
 759                         goto out;
 760                 }
 761
 762                 sge = (struct pvrdma_sge *)(wqe_hdr + 1);
 763                 for (i = 0; i < wr->num_sge; i++) {
 764                         /* Need to check wqe_size 0 or max size */
 765                         sge->addr = wr->sg_list[i].addr;
 766                         sge->length = wr->sg_list[i].length;
 767                         sge->lkey = wr->sg_list[i].lkey;
 768                         sge++;
 769                 }
 770
 771                 /* Make sure wqe is written before index update */
 772                 smp_wmb();
 773
 774                 index++;
 775                 if (unlikely(index >= qp->sq.wqe_cnt))
 776                         index = 0;
 777                 /* Update shared sq ring */
 778                 pvrdma_idx_ring_inc(&qp->sq.ring->prod_tail,
 779                                     qp->sq.wqe_cnt);
 780         }
 781
 782         ret = 0;
 783
 784 out:
 785         spin_unlock_irqrestore(&qp->sq.lock, flags);
 786
 787         if (!ret)
 788                 pvrdma_write_uar_qp(dev, PVRDMA_UAR_QP_SEND | qp->qp_handle);
 789
 790         return ret;
 791 }
 792
 793 /**
 794  * pvrdma_post_receive - post receive work request entries on a QP
 795  * @ibqp: the QP
 796  * @wr: the work request list to post
 797  * @bad_wr: the first bad WR returned
 798  *
 799  * @return: 0 on success, otherwise errno returned.
 800  */
 801 int pvrdma_post_recv(struct ib_qp *ibqp, struct ib_recv_wr *wr,
 802                      struct ib_recv_wr **bad_wr)
 803 {
 804         struct pvrdma_dev *dev = to_vdev(ibqp->device);
 805         unsigned long flags;
 806         struct pvrdma_qp *qp = to_vqp(ibqp);
 807         struct pvrdma_rq_wqe_hdr *wqe_hdr;
 808         struct pvrdma_sge *sge;
 809         int index, nreq;
 810         int ret = 0;
 811         int i;
 812
 813         /*
 814          * In the RESET state, we can fail immediately. For other states,
 815          * just post and let the device figure it out.
 816          */
 817         if (qp->state == IB_QPS_RESET) {
 818                 *bad_wr = wr;
 819                 return -EINVAL;
 820         }
 821
 822         spin_lock_irqsave(&qp->rq.lock, flags);
 823
 824         index = pvrdma_idx(&qp->rq.ring->prod_tail, qp->rq.wqe_cnt);
 825         for (nreq = 0; wr; nreq++, wr = wr->next) {
 826                 unsigned int tail;
 827
 828                 if (unlikely(wr->num_sge > qp->rq.max_sg ||
 829                              wr->num_sge < 0)) {
 830                         ret = -EINVAL;
 831                         *bad_wr = wr;
 832                         dev_warn_ratelimited(&dev->pdev->dev,
 833                                              "recv SGE overflow\n");
 834                         goto out;
 835                 }
 836
 837                 if (unlikely(!pvrdma_idx_ring_has_space(
 838                                 qp->rq.ring, qp->rq.wqe_cnt, &tail))) {
 839                         ret = -ENOMEM;
 840                         *bad_wr = wr;
 841                         dev_warn_ratelimited(&dev->pdev->dev,
 842                                              "recv queue full\n");
 843                         goto out;
 844                 }
 845
 846                 wqe_hdr = (struct pvrdma_rq_wqe_hdr *)get_rq_wqe(qp, index);
 847                 wqe_hdr->wr_id = wr->wr_id;
 848                 wqe_hdr->num_sge = wr->num_sge;
 849                 wqe_hdr->total_len = 0;
 850
 851                 sge = (struct pvrdma_sge *)(wqe_hdr + 1);
 852                 for (i = 0; i < wr->num_sge; i++) {
 853                         sge->addr = wr->sg_list[i].addr;
 854                         sge->length = wr->sg_list[i].length;
 855                         sge->lkey = wr->sg_list[i].lkey;
 856                         sge++;
 857                 }
 858
 859                 /* Make sure wqe is written before index update */
 860                 smp_wmb();
 861
 862                 index++;
 863                 if (unlikely(index >= qp->rq.wqe_cnt))
 864                         index = 0;
 865                 /* Update shared rq ring */
 866                 pvrdma_idx_ring_inc(&qp->rq.ring->prod_tail,
 867                                     qp->rq.wqe_cnt);
 868         }
 869
 870         spin_unlock_irqrestore(&qp->rq.lock, flags);
 871
 872         pvrdma_write_uar_qp(dev, PVRDMA_UAR_QP_RECV | qp->qp_handle);
 873
 874         return ret;
 875
 876 out:
 877         spin_unlock_irqrestore(&qp->rq.lock, flags);
 878
 879         return ret;
 880 }
 881
 882 /**
 883  * pvrdma_query_qp - query a queue pair's attributes
 884  * @ibqp: the queue pair to query
 885  * @attr: the queue pair's attributes
 886  * @attr_mask: attributes mask
 887  * @init_attr: initial queue pair attributes
 888  *
 889  * @returns 0 on success, otherwise returns an errno.
 890  */
 891 int pvrdma_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
 892                     int attr_mask, struct ib_qp_init_attr *init_attr)
 893 {
 894         struct pvrdma_dev *dev = to_vdev(ibqp->device);
 895         struct pvrdma_qp *qp = to_vqp(ibqp);
 896         union pvrdma_cmd_req req;
 897         union pvrdma_cmd_resp rsp;
 898         struct pvrdma_cmd_query_qp *cmd = &req.query_qp;
 899         struct pvrdma_cmd_query_qp_resp *resp = &rsp.query_qp_resp;
 900         int ret = 0;
 901
 902         mutex_lock(&qp->mutex);
 903
 904         if (qp->state == IB_QPS_RESET) {
 905                 attr->qp_state = IB_QPS_RESET;
 906                 goto out;
 907         }
 908
 909         memset(cmd, 0, sizeof(*cmd));
 910         cmd->hdr.cmd = PVRDMA_CMD_QUERY_QP;
 911         cmd->qp_handle = qp->qp_handle;
 912         cmd->attr_mask = ib_qp_attr_mask_to_pvrdma(attr_mask);
 913
 914         ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_QUERY_QP_RESP);
 915         if (ret < 0) {
 916                 dev_warn(&dev->pdev->dev,
 917                          "could not query queuepair, error: %d\n", ret);
 918                 goto out;
 919         }
 920
 921         attr->qp_state = pvrdma_qp_state_to_ib(resp->attrs.qp_state);
 922         attr->cur_qp_state =
 923                 pvrdma_qp_state_to_ib(resp->attrs.cur_qp_state);
 924         attr->path_mtu = pvrdma_mtu_to_ib(resp->attrs.path_mtu);
 925         attr->path_mig_state =
 926                 pvrdma_mig_state_to_ib(resp->attrs.path_mig_state);
 927         attr->qkey = resp->attrs.qkey;
 928         attr->rq_psn = resp->attrs.rq_psn;
 929         attr->sq_psn = resp->attrs.sq_psn;
 930         attr->dest_qp_num = resp->attrs.dest_qp_num;
 931         attr->qp_access_flags =
 932                 pvrdma_access_flags_to_ib(resp->attrs.qp_access_flags);
 933         attr->pkey_index = resp->attrs.pkey_index;
 934         attr->alt_pkey_index = resp->attrs.alt_pkey_index;
 935         attr->en_sqd_async_notify = resp->attrs.en_sqd_async_notify;
 936         attr->sq_draining = resp->attrs.sq_draining;
 937         attr->max_rd_atomic = resp->attrs.max_rd_atomic;
 938         attr->max_dest_rd_atomic = resp->attrs.max_dest_rd_atomic;
 939         attr->min_rnr_timer = resp->attrs.min_rnr_timer;
 940         attr->port_num = resp->attrs.port_num;
 941         attr->timeout = resp->attrs.timeout;
 942         attr->retry_cnt = resp->attrs.retry_cnt;
 943         attr->rnr_retry = resp->attrs.rnr_retry;
 944         attr->alt_port_num = resp->attrs.alt_port_num;
 945         attr->alt_timeout = resp->attrs.alt_timeout;
 946         pvrdma_qp_cap_to_ib(&attr->cap, &resp->attrs.cap);
 947         pvrdma_ah_attr_to_ib(&attr->ah_attr, &resp->attrs.ah_attr);
 948         pvrdma_ah_attr_to_ib(&attr->alt_ah_attr, &resp->attrs.alt_ah_attr);
 949
 950         qp->state = attr->qp_state;
 951
 952         ret = 0;
 953
 954 out:
 955         attr->cur_qp_state = attr->qp_state;
 956
 957         init_attr->event_handler = qp->ibqp.event_handler;
 958         init_attr->qp_context = qp->ibqp.qp_context;
 959         init_attr->send_cq = qp->ibqp.send_cq;
 960         init_attr->recv_cq = qp->ibqp.recv_cq;
 961         init_attr->srq = qp->ibqp.srq;
 962         init_attr->xrcd = NULL;
 963         init_attr->cap = attr->cap;
 964         init_attr->sq_sig_type = 0;
 965         init_attr->qp_type = qp->ibqp.qp_type;
 966         init_attr->create_flags = 0;
 967         init_attr->port_num = qp->port;
 968
 969         mutex_unlock(&qp->mutex);
 970         return ret;
 971 }