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 = PVRDMA_QP_NUM_HEADER_PAGES +
 174                           (qp->sq.wqe_cnt * qp->sq.wqe_size + PAGE_SIZE - 1) /
 175                                                                 PAGE_SIZE;
 176
 177         return 0;
 178 }
 179
 180 /**
 181  * pvrdma_create_qp - create queue pair
 182  * @pd: protection domain
 183  * @init_attr: queue pair attributes
 184  * @udata: user data
 185  *
 186  * @return: the ib_qp pointer on success, otherwise returns an errno.
 187  */
 188 struct ib_qp *pvrdma_create_qp(struct ib_pd *pd,
 189                                struct ib_qp_init_attr *init_attr,
 190                                struct ib_udata *udata)
 191 {
 192         struct pvrdma_qp *qp = NULL;
 193         struct pvrdma_dev *dev = to_vdev(pd->device);
 194         union pvrdma_cmd_req req;
 195         union pvrdma_cmd_resp rsp;
 196         struct pvrdma_cmd_create_qp *cmd = &req.create_qp;
 197         struct pvrdma_cmd_create_qp_resp *resp = &rsp.create_qp_resp;
 198         struct pvrdma_create_qp ucmd;
 199         unsigned long flags;
 200         int ret;
 201
 202         if (init_attr->create_flags) {
 203                 dev_warn(&dev->pdev->dev,
 204                          "invalid create queuepair flags %#x\n",
 205                          init_attr->create_flags);
 206                 return ERR_PTR(-EINVAL);
 207         }
 208
 209         if (init_attr->qp_type != IB_QPT_RC &&
 210             init_attr->qp_type != IB_QPT_UD &&
 211             init_attr->qp_type != IB_QPT_GSI) {
 212                 dev_warn(&dev->pdev->dev, "queuepair type %d not supported\n",
 213                          init_attr->qp_type);
 214                 return ERR_PTR(-EINVAL);
 215         }
 216
 217         if (!atomic_add_unless(&dev->num_qps, 1, dev->dsr->caps.max_qp))
 218                 return ERR_PTR(-ENOMEM);
 219
 220         switch (init_attr->qp_type) {
 221         case IB_QPT_GSI:
 222                 if (init_attr->port_num == 0 ||
 223                     init_attr->port_num > pd->device->phys_port_cnt ||
 224                     udata) {
 225                         dev_warn(&dev->pdev->dev, "invalid queuepair attrs\n");
 226                         ret = -EINVAL;
 227                         goto err_qp;
 228                 }
 229                 /* fall through */
 230         case IB_QPT_RC:
 231         case IB_QPT_UD:
 232                 qp = kzalloc(sizeof(*qp), GFP_KERNEL);
 233                 if (!qp) {
 234                         ret = -ENOMEM;
 235                         goto err_qp;
 236                 }
 237
 238                 spin_lock_init(&qp->sq.lock);
 239                 spin_lock_init(&qp->rq.lock);
 240                 mutex_init(&qp->mutex);
 241                 atomic_set(&qp->refcnt, 1);
 242                 init_waitqueue_head(&qp->wait);
 243
 244                 qp->state = IB_QPS_RESET;
 245
 246                 if (pd->uobject && udata) {
 247                         dev_dbg(&dev->pdev->dev,
 248                                 "create queuepair from user space\n");
 249
 250                         if (ib_copy_from_udata(&ucmd, udata, sizeof(ucmd))) {
 251                                 ret = -EFAULT;
 252                                 goto err_qp;
 253                         }
 254
 255                         /* set qp->sq.wqe_cnt, shift, buf_size.. */
 256                         qp->rumem = ib_umem_get(pd->uobject->context,
 257                                                 ucmd.rbuf_addr,
 258                                                 ucmd.rbuf_size, 0, 0);
 259                         if (IS_ERR(qp->rumem)) {
 260                                 ret = PTR_ERR(qp->rumem);
 261                                 goto err_qp;
 262                         }
 263
 264                         qp->sumem = ib_umem_get(pd->uobject->context,
 265                                                 ucmd.sbuf_addr,
 266                                                 ucmd.sbuf_size, 0, 0);
 267                         if (IS_ERR(qp->sumem)) {
 268                                 ib_umem_release(qp->rumem);
 269                                 ret = PTR_ERR(qp->sumem);
 270                                 goto err_qp;
 271                         }
 272
 273                         qp->npages_send = ib_umem_page_count(qp->sumem);
 274                         qp->npages_recv = ib_umem_page_count(qp->rumem);
 275                         qp->npages = qp->npages_send + qp->npages_recv;
 276                 } else {
 277                         qp->is_kernel = true;
 278
 279                         ret = pvrdma_set_sq_size(to_vdev(pd->device),
 280                                                  &init_attr->cap, qp);
 281                         if (ret)
 282                                 goto err_qp;
 283
 284                         ret = pvrdma_set_rq_size(to_vdev(pd->device),
 285                                                  &init_attr->cap, qp);
 286                         if (ret)
 287                                 goto err_qp;
 288
 289                         qp->npages = qp->npages_send + qp->npages_recv;
 290
 291                         /* Skip header page. */
 292                         qp->sq.offset = PVRDMA_QP_NUM_HEADER_PAGES * PAGE_SIZE;
 293
 294                         /* Recv queue pages are after send pages. */
 295                         qp->rq.offset = qp->npages_send * PAGE_SIZE;
 296                 }
 297
 298                 if (qp->npages < 0 || qp->npages > PVRDMA_PAGE_DIR_MAX_PAGES) {
 299                         dev_warn(&dev->pdev->dev,
 300                                  "overflow pages in queuepair\n");
 301                         ret = -EINVAL;
 302                         goto err_umem;
 303                 }
 304
 305                 ret = pvrdma_page_dir_init(dev, &qp->pdir, qp->npages,
 306                                            qp->is_kernel);
 307                 if (ret) {
 308                         dev_warn(&dev->pdev->dev,
 309                                  "could not allocate page directory\n");
 310                         goto err_umem;
 311                 }
 312
 313                 if (!qp->is_kernel) {
 314                         pvrdma_page_dir_insert_umem(&qp->pdir, qp->sumem, 0);
 315                         pvrdma_page_dir_insert_umem(&qp->pdir, qp->rumem,
 316                                                     qp->npages_send);
 317                 } else {
 318                         /* Ring state is always the first page. */
 319                         qp->sq.ring = qp->pdir.pages[0];
 320                         qp->rq.ring = &qp->sq.ring[1];
 321                 }
 322                 break;
 323         default:
 324                 ret = -EINVAL;
 325                 goto err_qp;
 326         }
 327
 328         /* Not supported */
 329         init_attr->cap.max_inline_data = 0;
 330
 331         memset(cmd, 0, sizeof(*cmd));
 332         cmd->hdr.cmd = PVRDMA_CMD_CREATE_QP;
 333         cmd->pd_handle = to_vpd(pd)->pd_handle;
 334         cmd->send_cq_handle = to_vcq(init_attr->send_cq)->cq_handle;
 335         cmd->recv_cq_handle = to_vcq(init_attr->recv_cq)->cq_handle;
 336         cmd->max_send_wr = init_attr->cap.max_send_wr;
 337         cmd->max_recv_wr = init_attr->cap.max_recv_wr;
 338         cmd->max_send_sge = init_attr->cap.max_send_sge;
 339         cmd->max_recv_sge = init_attr->cap.max_recv_sge;
 340         cmd->max_inline_data = init_attr->cap.max_inline_data;
 341         cmd->sq_sig_all = (init_attr->sq_sig_type == IB_SIGNAL_ALL_WR) ? 1 : 0;
 342         cmd->qp_type = ib_qp_type_to_pvrdma(init_attr->qp_type);
 343         cmd->access_flags = IB_ACCESS_LOCAL_WRITE;
 344         cmd->total_chunks = qp->npages;
 345         cmd->send_chunks = qp->npages_send - PVRDMA_QP_NUM_HEADER_PAGES;
 346         cmd->pdir_dma = qp->pdir.dir_dma;
 347
 348         dev_dbg(&dev->pdev->dev, "create queuepair with %d, %d, %d, %d\n",
 349                 cmd->max_send_wr, cmd->max_recv_wr, cmd->max_send_sge,
 350                 cmd->max_recv_sge);
 351
 352         ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_QP_RESP);
 353         if (ret < 0) {
 354                 dev_warn(&dev->pdev->dev,
 355                          "could not create queuepair, error: %d\n", ret);
 356                 goto err_pdir;
 357         }
 358
 359         /* max_send_wr/_recv_wr/_send_sge/_recv_sge/_inline_data */
 360         qp->qp_handle = resp->qpn;
 361         qp->port = init_attr->port_num;
 362         qp->ibqp.qp_num = resp->qpn;
 363         spin_lock_irqsave(&dev->qp_tbl_lock, flags);
 364         dev->qp_tbl[qp->qp_handle % dev->dsr->caps.max_qp] = qp;
 365         spin_unlock_irqrestore(&dev->qp_tbl_lock, flags);
 366
 367         return &qp->ibqp;
 368
 369 err_pdir:
 370         pvrdma_page_dir_cleanup(dev, &qp->pdir);
 371 err_umem:
 372         if (pd->uobject && udata) {
 373                 if (qp->rumem)
 374                         ib_umem_release(qp->rumem);
 375                 if (qp->sumem)
 376                         ib_umem_release(qp->sumem);
 377         }
 378 err_qp:
 379         kfree(qp);
 380         atomic_dec(&dev->num_qps);
 381
 382         return ERR_PTR(ret);
 383 }
 384
 385 static void pvrdma_free_qp(struct pvrdma_qp *qp)
 386 {
 387         struct pvrdma_dev *dev = to_vdev(qp->ibqp.device);
 388         struct pvrdma_cq *scq;
 389         struct pvrdma_cq *rcq;
 390         unsigned long flags, scq_flags, rcq_flags;
 391
 392         /* In case cq is polling */
 393         get_cqs(qp, &scq, &rcq);
 394         pvrdma_lock_cqs(scq, rcq, &scq_flags, &rcq_flags);
 395
 396         _pvrdma_flush_cqe(qp, scq);
 397         if (scq != rcq)
 398                 _pvrdma_flush_cqe(qp, rcq);
 399
 400         spin_lock_irqsave(&dev->qp_tbl_lock, flags);
 401         dev->qp_tbl[qp->qp_handle] = NULL;
 402         spin_unlock_irqrestore(&dev->qp_tbl_lock, flags);
 403
 404         pvrdma_unlock_cqs(scq, rcq, &scq_flags, &rcq_flags);
 405
 406         atomic_dec(&qp->refcnt);
 407         wait_event(qp->wait, !atomic_read(&qp->refcnt));
 408
 409         if (!qp->is_kernel) {
 410                 if (qp->rumem)
 411                         ib_umem_release(qp->rumem);
 412                 if (qp->sumem)
 413                         ib_umem_release(qp->sumem);
 414         }
 415
 416         pvrdma_page_dir_cleanup(dev, &qp->pdir);
 417
 418         kfree(qp);
 419
 420         atomic_dec(&dev->num_qps);
 421 }
 422
 423 /**
 424  * pvrdma_destroy_qp - destroy a queue pair
 425  * @qp: the queue pair to destroy
 426  *
 427  * @return: 0 on success.
 428  */
 429 int pvrdma_destroy_qp(struct ib_qp *qp)
 430 {
 431         struct pvrdma_qp *vqp = to_vqp(qp);
 432         union pvrdma_cmd_req req;
 433         struct pvrdma_cmd_destroy_qp *cmd = &req.destroy_qp;
 434         int ret;
 435
 436         memset(cmd, 0, sizeof(*cmd));
 437         cmd->hdr.cmd = PVRDMA_CMD_DESTROY_QP;
 438         cmd->qp_handle = vqp->qp_handle;
 439
 440         ret = pvrdma_cmd_post(to_vdev(qp->device), &req, NULL, 0);
 441         if (ret < 0)
 442                 dev_warn(&to_vdev(qp->device)->pdev->dev,
 443                          "destroy queuepair failed, error: %d\n", ret);
 444
 445         pvrdma_free_qp(vqp);
 446
 447         return 0;
 448 }
 449
 450 /**
 451  * pvrdma_modify_qp - modify queue pair attributes
 452  * @ibqp: the queue pair
 453  * @attr: the new queue pair's attributes
 454  * @attr_mask: attributes mask
 455  * @udata: user data
 456  *
 457  * @returns 0 on success, otherwise returns an errno.
 458  */
 459 int pvrdma_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
 460                      int attr_mask, struct ib_udata *udata)
 461 {
 462         struct pvrdma_dev *dev = to_vdev(ibqp->device);
 463         struct pvrdma_qp *qp = to_vqp(ibqp);
 464         union pvrdma_cmd_req req;
 465         union pvrdma_cmd_resp rsp;
 466         struct pvrdma_cmd_modify_qp *cmd = &req.modify_qp;
 467         int cur_state, next_state;
 468         int ret;
 469
 470         /* Sanity checking. Should need lock here */
 471         mutex_lock(&qp->mutex);
 472         cur_state = (attr_mask & IB_QP_CUR_STATE) ? attr->cur_qp_state :
 473                 qp->state;
 474         next_state = (attr_mask & IB_QP_STATE) ? attr->qp_state : cur_state;
 475
 476         if (!ib_modify_qp_is_ok(cur_state, next_state, ibqp->qp_type,
 477                                 attr_mask, IB_LINK_LAYER_ETHERNET)) {
 478                 ret = -EINVAL;
 479                 goto out;
 480         }
 481
 482         if (attr_mask & IB_QP_PORT) {
 483                 if (attr->port_num == 0 ||
 484                     attr->port_num > ibqp->device->phys_port_cnt) {
 485                         ret = -EINVAL;
 486                         goto out;
 487                 }
 488         }
 489
 490         if (attr_mask & IB_QP_MIN_RNR_TIMER) {
 491                 if (attr->min_rnr_timer > 31) {
 492                         ret = -EINVAL;
 493                         goto out;
 494                 }
 495         }
 496
 497         if (attr_mask & IB_QP_PKEY_INDEX) {
 498                 if (attr->pkey_index >= dev->dsr->caps.max_pkeys) {
 499                         ret = -EINVAL;
 500                         goto out;
 501                 }
 502         }
 503
 504         if (attr_mask & IB_QP_QKEY)
 505                 qp->qkey = attr->qkey;
 506
 507         if (cur_state == next_state && cur_state == IB_QPS_RESET) {
 508                 ret = 0;
 509                 goto out;
 510         }
 511
 512         qp->state = next_state;
 513         memset(cmd, 0, sizeof(*cmd));
 514         cmd->hdr.cmd = PVRDMA_CMD_MODIFY_QP;
 515         cmd->qp_handle = qp->qp_handle;
 516         cmd->attr_mask = ib_qp_attr_mask_to_pvrdma(attr_mask);
 517         cmd->attrs.qp_state = ib_qp_state_to_pvrdma(attr->qp_state);
 518         cmd->attrs.cur_qp_state =
 519                 ib_qp_state_to_pvrdma(attr->cur_qp_state);
 520         cmd->attrs.path_mtu = ib_mtu_to_pvrdma(attr->path_mtu);
 521         cmd->attrs.path_mig_state =
 522                 ib_mig_state_to_pvrdma(attr->path_mig_state);
 523         cmd->attrs.qkey = attr->qkey;
 524         cmd->attrs.rq_psn = attr->rq_psn;
 525         cmd->attrs.sq_psn = attr->sq_psn;
 526         cmd->attrs.dest_qp_num = attr->dest_qp_num;
 527         cmd->attrs.qp_access_flags =
 528                 ib_access_flags_to_pvrdma(attr->qp_access_flags);
 529         cmd->attrs.pkey_index = attr->pkey_index;
 530         cmd->attrs.alt_pkey_index = attr->alt_pkey_index;
 531         cmd->attrs.en_sqd_async_notify = attr->en_sqd_async_notify;
 532         cmd->attrs.sq_draining = attr->sq_draining;
 533         cmd->attrs.max_rd_atomic = attr->max_rd_atomic;
 534         cmd->attrs.max_dest_rd_atomic = attr->max_dest_rd_atomic;
 535         cmd->attrs.min_rnr_timer = attr->min_rnr_timer;
 536         cmd->attrs.port_num = attr->port_num;
 537         cmd->attrs.timeout = attr->timeout;
 538         cmd->attrs.retry_cnt = attr->retry_cnt;
 539         cmd->attrs.rnr_retry = attr->rnr_retry;
 540         cmd->attrs.alt_port_num = attr->alt_port_num;
 541         cmd->attrs.alt_timeout = attr->alt_timeout;
 542         ib_qp_cap_to_pvrdma(&cmd->attrs.cap, &attr->cap);
 543         rdma_ah_attr_to_pvrdma(&cmd->attrs.ah_attr, &attr->ah_attr);
 544         rdma_ah_attr_to_pvrdma(&cmd->attrs.alt_ah_attr, &attr->alt_ah_attr);
 545
 546         ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_MODIFY_QP_RESP);
 547         if (ret < 0) {
 548                 dev_warn(&dev->pdev->dev,
 549                          "could not modify queuepair, error: %d\n", ret);
 550         } else if (rsp.hdr.err > 0) {
 551                 dev_warn(&dev->pdev->dev,
 552                          "cannot modify queuepair, error: %d\n", rsp.hdr.err);
 553                 ret = -EINVAL;
 554         }
 555
 556         if (ret == 0 && next_state == IB_QPS_RESET)
 557                 pvrdma_reset_qp(qp);
 558
 559 out:
 560         mutex_unlock(&qp->mutex);
 561
 562         return ret;
 563 }
 564
 565 static inline void *get_sq_wqe(struct pvrdma_qp *qp, unsigned int n)
 566 {
 567         return pvrdma_page_dir_get_ptr(&qp->pdir,
 568                                        qp->sq.offset + n * qp->sq.wqe_size);
 569 }
 570
 571 static inline void *get_rq_wqe(struct pvrdma_qp *qp, unsigned int n)
 572 {
 573         return pvrdma_page_dir_get_ptr(&qp->pdir,
 574                                        qp->rq.offset + n * qp->rq.wqe_size);
 575 }
 576
 577 static int set_reg_seg(struct pvrdma_sq_wqe_hdr *wqe_hdr, struct ib_reg_wr *wr)
 578 {
 579         struct pvrdma_user_mr *mr = to_vmr(wr->mr);
 580
 581         wqe_hdr->wr.fast_reg.iova_start = mr->ibmr.iova;
 582         wqe_hdr->wr.fast_reg.pl_pdir_dma = mr->pdir.dir_dma;
 583         wqe_hdr->wr.fast_reg.page_shift = mr->page_shift;
 584         wqe_hdr->wr.fast_reg.page_list_len = mr->npages;
 585         wqe_hdr->wr.fast_reg.length = mr->ibmr.length;
 586         wqe_hdr->wr.fast_reg.access_flags = wr->access;
 587         wqe_hdr->wr.fast_reg.rkey = wr->key;
 588
 589         return pvrdma_page_dir_insert_page_list(&mr->pdir, mr->pages,
 590                                                 mr->npages);
 591 }
 592
 593 /**
 594  * pvrdma_post_send - post send work request entries on a QP
 595  * @ibqp: the QP
 596  * @wr: work request list to post
 597  * @bad_wr: the first bad WR returned
 598  *
 599  * @return: 0 on success, otherwise errno returned.
 600  */
 601 int pvrdma_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
 602                      struct ib_send_wr **bad_wr)
 603 {
 604         struct pvrdma_qp *qp = to_vqp(ibqp);
 605         struct pvrdma_dev *dev = to_vdev(ibqp->device);
 606         unsigned long flags;
 607         struct pvrdma_sq_wqe_hdr *wqe_hdr;
 608         struct pvrdma_sge *sge;
 609         int i, ret;
 610
 611         /*
 612          * In states lower than RTS, we can fail immediately. In other states,
 613          * just post and let the device figure it out.
 614          */
 615         if (qp->state < IB_QPS_RTS) {
 616                 *bad_wr = wr;
 617                 return -EINVAL;
 618         }
 619
 620         spin_lock_irqsave(&qp->sq.lock, flags);
 621
 622         while (wr) {
 623                 unsigned int tail = 0;
 624
 625                 if (unlikely(!pvrdma_idx_ring_has_space(
 626                                 qp->sq.ring, qp->sq.wqe_cnt, &tail))) {
 627                         dev_warn_ratelimited(&dev->pdev->dev,
 628                                              "send queue is full\n");
 629                         *bad_wr = wr;
 630                         ret = -ENOMEM;
 631                         goto out;
 632                 }
 633
 634                 if (unlikely(wr->num_sge > qp->sq.max_sg || wr->num_sge < 0)) {
 635                         dev_warn_ratelimited(&dev->pdev->dev,
 636                                              "send SGE overflow\n");
 637                         *bad_wr = wr;
 638                         ret = -EINVAL;
 639                         goto out;
 640                 }
 641
 642                 if (unlikely(wr->opcode < 0)) {
 643                         dev_warn_ratelimited(&dev->pdev->dev,
 644                                              "invalid send opcode\n");
 645                         *bad_wr = wr;
 646                         ret = -EINVAL;
 647                         goto out;
 648                 }
 649
 650                 /*
 651                  * Only support UD, RC.
 652                  * Need to check opcode table for thorough checking.
 653                  * opcode               _UD     _UC     _RC
 654                  * _SEND                x       x       x
 655                  * _SEND_WITH_IMM       x       x       x
 656                  * _RDMA_WRITE                  x       x
 657                  * _RDMA_WRITE_WITH_IMM         x       x
 658                  * _LOCAL_INV                   x       x
 659                  * _SEND_WITH_INV               x       x
 660                  * _RDMA_READ                           x
 661                  * _ATOMIC_CMP_AND_SWP                  x
 662                  * _ATOMIC_FETCH_AND_ADD                x
 663                  * _MASK_ATOMIC_CMP_AND_SWP             x
 664                  * _MASK_ATOMIC_FETCH_AND_ADD           x
 665                  * _REG_MR                              x
 666                  *
 667                  */
 668                 if (qp->ibqp.qp_type != IB_QPT_UD &&
 669                     qp->ibqp.qp_type != IB_QPT_RC &&
 670                         wr->opcode != IB_WR_SEND) {
 671                         dev_warn_ratelimited(&dev->pdev->dev,
 672                                              "unsupported queuepair type\n");
 673                         *bad_wr = wr;
 674                         ret = -EINVAL;
 675                         goto out;
 676                 } else if (qp->ibqp.qp_type == IB_QPT_UD ||
 677                            qp->ibqp.qp_type == IB_QPT_GSI) {
 678                         if (wr->opcode != IB_WR_SEND &&
 679                             wr->opcode != IB_WR_SEND_WITH_IMM) {
 680                                 dev_warn_ratelimited(&dev->pdev->dev,
 681                                                      "invalid send opcode\n");
 682                                 *bad_wr = wr;
 683                                 ret = -EINVAL;
 684                                 goto out;
 685                         }
 686                 }
 687
 688                 wqe_hdr = (struct pvrdma_sq_wqe_hdr *)get_sq_wqe(qp, tail);
 689                 memset(wqe_hdr, 0, sizeof(*wqe_hdr));
 690                 wqe_hdr->wr_id = wr->wr_id;
 691                 wqe_hdr->num_sge = wr->num_sge;
 692                 wqe_hdr->opcode = ib_wr_opcode_to_pvrdma(wr->opcode);
 693                 wqe_hdr->send_flags = ib_send_flags_to_pvrdma(wr->send_flags);
 694                 if (wr->opcode == IB_WR_SEND_WITH_IMM ||
 695                     wr->opcode == IB_WR_RDMA_WRITE_WITH_IMM)
 696                         wqe_hdr->ex.imm_data = wr->ex.imm_data;
 697
 698                 switch (qp->ibqp.qp_type) {
 699                 case IB_QPT_GSI:
 700                 case IB_QPT_UD:
 701                         if (unlikely(!ud_wr(wr)->ah)) {
 702                                 dev_warn_ratelimited(&dev->pdev->dev,
 703                                                      "invalid address handle\n");
 704                                 *bad_wr = wr;
 705                                 ret = -EINVAL;
 706                                 goto out;
 707                         }
 708
 709                         /*
 710                          * Use qkey from qp context if high order bit set,
 711                          * otherwise from work request.
 712                          */
 713                         wqe_hdr->wr.ud.remote_qpn = ud_wr(wr)->remote_qpn;
 714                         wqe_hdr->wr.ud.remote_qkey =
 715                                 ud_wr(wr)->remote_qkey & 0x80000000 ?
 716                                 qp->qkey : ud_wr(wr)->remote_qkey;
 717                         wqe_hdr->wr.ud.av = to_vah(ud_wr(wr)->ah)->av;
 718
 719                         break;
 720                 case IB_QPT_RC:
 721                         switch (wr->opcode) {
 722                         case IB_WR_RDMA_READ:
 723                         case IB_WR_RDMA_WRITE:
 724                         case IB_WR_RDMA_WRITE_WITH_IMM:
 725                                 wqe_hdr->wr.rdma.remote_addr =
 726                                         rdma_wr(wr)->remote_addr;
 727                                 wqe_hdr->wr.rdma.rkey = rdma_wr(wr)->rkey;
 728                                 break;
 729                         case IB_WR_LOCAL_INV:
 730                         case IB_WR_SEND_WITH_INV:
 731                                 wqe_hdr->ex.invalidate_rkey =
 732                                         wr->ex.invalidate_rkey;
 733                                 break;
 734                         case IB_WR_ATOMIC_CMP_AND_SWP:
 735                         case IB_WR_ATOMIC_FETCH_AND_ADD:
 736                                 wqe_hdr->wr.atomic.remote_addr =
 737                                         atomic_wr(wr)->remote_addr;
 738                                 wqe_hdr->wr.atomic.rkey = atomic_wr(wr)->rkey;
 739                                 wqe_hdr->wr.atomic.compare_add =
 740                                         atomic_wr(wr)->compare_add;
 741                                 if (wr->opcode == IB_WR_ATOMIC_CMP_AND_SWP)
 742                                         wqe_hdr->wr.atomic.swap =
 743                                                 atomic_wr(wr)->swap;
 744                                 break;
 745                         case IB_WR_REG_MR:
 746                                 ret = set_reg_seg(wqe_hdr, reg_wr(wr));
 747                                 if (ret < 0) {
 748                                         dev_warn_ratelimited(&dev->pdev->dev,
 749                                                              "Failed to set fast register work request\n");
 750                                         *bad_wr = wr;
 751                                         goto out;
 752                                 }
 753                                 break;
 754                         default:
 755                                 break;
 756                         }
 757
 758                         break;
 759                 default:
 760                         dev_warn_ratelimited(&dev->pdev->dev,
 761                                              "invalid queuepair type\n");
 762                         ret = -EINVAL;
 763                         *bad_wr = wr;
 764                         goto out;
 765                 }
 766
 767                 sge = (struct pvrdma_sge *)(wqe_hdr + 1);
 768                 for (i = 0; i < wr->num_sge; i++) {
 769                         /* Need to check wqe_size 0 or max size */
 770                         sge->addr = wr->sg_list[i].addr;
 771                         sge->length = wr->sg_list[i].length;
 772                         sge->lkey = wr->sg_list[i].lkey;
 773                         sge++;
 774                 }
 775
 776                 /* Make sure wqe is written before index update */
 777                 smp_wmb();
 778
 779                 /* Update shared sq ring */
 780                 pvrdma_idx_ring_inc(&qp->sq.ring->prod_tail,
 781                                     qp->sq.wqe_cnt);
 782
 783                 wr = wr->next;
 784         }
 785
 786         ret = 0;
 787
 788 out:
 789         spin_unlock_irqrestore(&qp->sq.lock, flags);
 790
 791         if (!ret)
 792                 pvrdma_write_uar_qp(dev, PVRDMA_UAR_QP_SEND | qp->qp_handle);
 793
 794         return ret;
 795 }
 796
 797 /**
 798  * pvrdma_post_receive - post receive work request entries on a QP
 799  * @ibqp: the QP
 800  * @wr: the work request list to post
 801  * @bad_wr: the first bad WR returned
 802  *
 803  * @return: 0 on success, otherwise errno returned.
 804  */
 805 int pvrdma_post_recv(struct ib_qp *ibqp, struct ib_recv_wr *wr,
 806                      struct ib_recv_wr **bad_wr)
 807 {
 808         struct pvrdma_dev *dev = to_vdev(ibqp->device);
 809         unsigned long flags;
 810         struct pvrdma_qp *qp = to_vqp(ibqp);
 811         struct pvrdma_rq_wqe_hdr *wqe_hdr;
 812         struct pvrdma_sge *sge;
 813         int ret = 0;
 814         int i;
 815
 816         /*
 817          * In the RESET state, we can fail immediately. For other states,
 818          * just post and let the device figure it out.
 819          */
 820         if (qp->state == IB_QPS_RESET) {
 821                 *bad_wr = wr;
 822                 return -EINVAL;
 823         }
 824
 825         spin_lock_irqsave(&qp->rq.lock, flags);
 826
 827         while (wr) {
 828                 unsigned int tail = 0;
 829
 830                 if (unlikely(wr->num_sge > qp->rq.max_sg ||
 831                              wr->num_sge < 0)) {
 832                         ret = -EINVAL;
 833                         *bad_wr = wr;
 834                         dev_warn_ratelimited(&dev->pdev->dev,
 835                                              "recv SGE overflow\n");
 836                         goto out;
 837                 }
 838
 839                 if (unlikely(!pvrdma_idx_ring_has_space(
 840                                 qp->rq.ring, qp->rq.wqe_cnt, &tail))) {
 841                         ret = -ENOMEM;
 842                         *bad_wr = wr;
 843                         dev_warn_ratelimited(&dev->pdev->dev,
 844                                              "recv queue full\n");
 845                         goto out;
 846                 }
 847
 848                 wqe_hdr = (struct pvrdma_rq_wqe_hdr *)get_rq_wqe(qp, tail);
 849                 wqe_hdr->wr_id = wr->wr_id;
 850                 wqe_hdr->num_sge = wr->num_sge;
 851                 wqe_hdr->total_len = 0;
 852
 853                 sge = (struct pvrdma_sge *)(wqe_hdr + 1);
 854                 for (i = 0; i < wr->num_sge; i++) {
 855                         sge->addr = wr->sg_list[i].addr;
 856                         sge->length = wr->sg_list[i].length;
 857                         sge->lkey = wr->sg_list[i].lkey;
 858                         sge++;
 859                 }
 860
 861                 /* Make sure wqe is written before index update */
 862                 smp_wmb();
 863
 864                 /* Update shared rq ring */
 865                 pvrdma_idx_ring_inc(&qp->rq.ring->prod_tail,
 866                                     qp->rq.wqe_cnt);
 867
 868                 wr = wr->next;
 869         }
 870
 871         spin_unlock_irqrestore(&qp->rq.lock, flags);
 872
 873         pvrdma_write_uar_qp(dev, PVRDMA_UAR_QP_RECV | qp->qp_handle);
 874
 875         return ret;
 876
 877 out:
 878         spin_unlock_irqrestore(&qp->rq.lock, flags);
 879
 880         return ret;
 881 }
 882
 883 /**
 884  * pvrdma_query_qp - query a queue pair's attributes
 885  * @ibqp: the queue pair to query
 886  * @attr: the queue pair's attributes
 887  * @attr_mask: attributes mask
 888  * @init_attr: initial queue pair attributes
 889  *
 890  * @returns 0 on success, otherwise returns an errno.
 891  */
 892 int pvrdma_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
 893                     int attr_mask, struct ib_qp_init_attr *init_attr)
 894 {
 895         struct pvrdma_dev *dev = to_vdev(ibqp->device);
 896         struct pvrdma_qp *qp = to_vqp(ibqp);
 897         union pvrdma_cmd_req req;
 898         union pvrdma_cmd_resp rsp;
 899         struct pvrdma_cmd_query_qp *cmd = &req.query_qp;
 900         struct pvrdma_cmd_query_qp_resp *resp = &rsp.query_qp_resp;
 901         int ret = 0;
 902
 903         mutex_lock(&qp->mutex);
 904
 905         if (qp->state == IB_QPS_RESET) {
 906                 attr->qp_state = IB_QPS_RESET;
 907                 goto out;
 908         }
 909
 910         memset(cmd, 0, sizeof(*cmd));
 911         cmd->hdr.cmd = PVRDMA_CMD_QUERY_QP;
 912         cmd->qp_handle = qp->qp_handle;
 913         cmd->attr_mask = ib_qp_attr_mask_to_pvrdma(attr_mask);
 914
 915         ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_QUERY_QP_RESP);
 916         if (ret < 0) {
 917                 dev_warn(&dev->pdev->dev,
 918                          "could not query queuepair, error: %d\n", ret);
 919                 goto out;
 920         }
 921
 922         attr->qp_state = pvrdma_qp_state_to_ib(resp->attrs.qp_state);
 923         attr->cur_qp_state =
 924                 pvrdma_qp_state_to_ib(resp->attrs.cur_qp_state);
 925         attr->path_mtu = pvrdma_mtu_to_ib(resp->attrs.path_mtu);
 926         attr->path_mig_state =
 927                 pvrdma_mig_state_to_ib(resp->attrs.path_mig_state);
 928         attr->qkey = resp->attrs.qkey;
 929         attr->rq_psn = resp->attrs.rq_psn;
 930         attr->sq_psn = resp->attrs.sq_psn;
 931         attr->dest_qp_num = resp->attrs.dest_qp_num;
 932         attr->qp_access_flags =
 933                 pvrdma_access_flags_to_ib(resp->attrs.qp_access_flags);
 934         attr->pkey_index = resp->attrs.pkey_index;
 935         attr->alt_pkey_index = resp->attrs.alt_pkey_index;
 936         attr->en_sqd_async_notify = resp->attrs.en_sqd_async_notify;
 937         attr->sq_draining = resp->attrs.sq_draining;
 938         attr->max_rd_atomic = resp->attrs.max_rd_atomic;
 939         attr->max_dest_rd_atomic = resp->attrs.max_dest_rd_atomic;
 940         attr->min_rnr_timer = resp->attrs.min_rnr_timer;
 941         attr->port_num = resp->attrs.port_num;
 942         attr->timeout = resp->attrs.timeout;
 943         attr->retry_cnt = resp->attrs.retry_cnt;
 944         attr->rnr_retry = resp->attrs.rnr_retry;
 945         attr->alt_port_num = resp->attrs.alt_port_num;
 946         attr->alt_timeout = resp->attrs.alt_timeout;
 947         pvrdma_qp_cap_to_ib(&attr->cap, &resp->attrs.cap);
 948         pvrdma_ah_attr_to_rdma(&attr->ah_attr, &resp->attrs.ah_attr);
 949         pvrdma_ah_attr_to_rdma(&attr->alt_ah_attr, &resp->attrs.alt_ah_attr);
 950
 951         qp->state = attr->qp_state;
 952
 953         ret = 0;
 954
 955 out:
 956         attr->cur_qp_state = attr->qp_state;
 957
 958         init_attr->event_handler = qp->ibqp.event_handler;
 959         init_attr->qp_context = qp->ibqp.qp_context;
 960         init_attr->send_cq = qp->ibqp.send_cq;
 961         init_attr->recv_cq = qp->ibqp.recv_cq;
 962         init_attr->srq = qp->ibqp.srq;
 963         init_attr->xrcd = NULL;
 964         init_attr->cap = attr->cap;
 965         init_attr->sq_sig_type = 0;
 966         init_attr->qp_type = qp->ibqp.qp_type;
 967         init_attr->create_flags = 0;
 968         init_attr->port_num = qp->port;
 969
 970         mutex_unlock(&qp->mutex);
 971         return ret;
 972 }