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         bool is_srq = !!init_attr->srq;
 202
 203         if (init_attr->create_flags) {
 204                 dev_warn(&dev->pdev->dev,
 205                          "invalid create queuepair flags %#x\n",
 206                          init_attr->create_flags);
 207                 return ERR_PTR(-EINVAL);
 208         }
 209
 210         if (init_attr->qp_type != IB_QPT_RC &&
 211             init_attr->qp_type != IB_QPT_UD &&
 212             init_attr->qp_type != IB_QPT_GSI) {
 213                 dev_warn(&dev->pdev->dev, "queuepair type %d not supported\n",
 214                          init_attr->qp_type);
 215                 return ERR_PTR(-EINVAL);
 216         }
 217
 218         if (is_srq && !dev->dsr->caps.max_srq) {
 219                 dev_warn(&dev->pdev->dev,
 220                          "SRQs not supported by device\n");
 221                 return ERR_PTR(-EINVAL);
 222         }
 223
 224         if (!atomic_add_unless(&dev->num_qps, 1, dev->dsr->caps.max_qp))
 225                 return ERR_PTR(-ENOMEM);
 226
 227         switch (init_attr->qp_type) {
 228         case IB_QPT_GSI:
 229                 if (init_attr->port_num == 0 ||
 230                     init_attr->port_num > pd->device->phys_port_cnt ||
 231                     udata) {
 232                         dev_warn(&dev->pdev->dev, "invalid queuepair attrs\n");
 233                         ret = -EINVAL;
 234                         goto err_qp;
 235                 }
 236                 /* fall through */
 237         case IB_QPT_RC:
 238         case IB_QPT_UD:
 239                 qp = kzalloc(sizeof(*qp), GFP_KERNEL);
 240                 if (!qp) {
 241                         ret = -ENOMEM;
 242                         goto err_qp;
 243                 }
 244
 245                 spin_lock_init(&qp->sq.lock);
 246                 spin_lock_init(&qp->rq.lock);
 247                 mutex_init(&qp->mutex);
 248                 atomic_set(&qp->refcnt, 1);
 249                 init_waitqueue_head(&qp->wait);
 250
 251                 qp->state = IB_QPS_RESET;
 252
 253                 if (pd->uobject && udata) {
 254                         dev_dbg(&dev->pdev->dev,
 255                                 "create queuepair from user space\n");
 256
 257                         if (ib_copy_from_udata(&ucmd, udata, sizeof(ucmd))) {
 258                                 ret = -EFAULT;
 259                                 goto err_qp;
 260                         }
 261
 262                         if (!is_srq) {
 263                                 /* set qp->sq.wqe_cnt, shift, buf_size.. */
 264                                 qp->rumem = ib_umem_get(pd->uobject->context,
 265                                                         ucmd.rbuf_addr,
 266                                                         ucmd.rbuf_size, 0, 0);
 267                                 if (IS_ERR(qp->rumem)) {
 268                                         ret = PTR_ERR(qp->rumem);
 269                                         goto err_qp;
 270                                 }
 271                                 qp->srq = NULL;
 272                         } else {
 273                                 qp->rumem = NULL;
 274                                 qp->srq = to_vsrq(init_attr->srq);
 275                         }
 276
 277                         qp->sumem = ib_umem_get(pd->uobject->context,
 278                                                 ucmd.sbuf_addr,
 279                                                 ucmd.sbuf_size, 0, 0);
 280                         if (IS_ERR(qp->sumem)) {
 281                                 if (!is_srq)
 282                                         ib_umem_release(qp->rumem);
 283                                 ret = PTR_ERR(qp->sumem);
 284                                 goto err_qp;
 285                         }
 286
 287                         qp->npages_send = ib_umem_page_count(qp->sumem);
 288                         if (!is_srq)
 289                                 qp->npages_recv = ib_umem_page_count(qp->rumem);
 290                         else
 291                                 qp->npages_recv = 0;
 292                         qp->npages = qp->npages_send + qp->npages_recv;
 293                 } else {
 294                         qp->is_kernel = true;
 295
 296                         ret = pvrdma_set_sq_size(to_vdev(pd->device),
 297                                                  &init_attr->cap, qp);
 298                         if (ret)
 299                                 goto err_qp;
 300
 301                         ret = pvrdma_set_rq_size(to_vdev(pd->device),
 302                                                  &init_attr->cap, qp);
 303                         if (ret)
 304                                 goto err_qp;
 305
 306                         qp->npages = qp->npages_send + qp->npages_recv;
 307
 308                         /* Skip header page. */
 309                         qp->sq.offset = PVRDMA_QP_NUM_HEADER_PAGES * PAGE_SIZE;
 310
 311                         /* Recv queue pages are after send pages. */
 312                         qp->rq.offset = qp->npages_send * PAGE_SIZE;
 313                 }
 314
 315                 if (qp->npages < 0 || qp->npages > PVRDMA_PAGE_DIR_MAX_PAGES) {
 316                         dev_warn(&dev->pdev->dev,
 317                                  "overflow pages in queuepair\n");
 318                         ret = -EINVAL;
 319                         goto err_umem;
 320                 }
 321
 322                 ret = pvrdma_page_dir_init(dev, &qp->pdir, qp->npages,
 323                                            qp->is_kernel);
 324                 if (ret) {
 325                         dev_warn(&dev->pdev->dev,
 326                                  "could not allocate page directory\n");
 327                         goto err_umem;
 328                 }
 329
 330                 if (!qp->is_kernel) {
 331                         pvrdma_page_dir_insert_umem(&qp->pdir, qp->sumem, 0);
 332                         if (!is_srq)
 333                                 pvrdma_page_dir_insert_umem(&qp->pdir,
 334                                                             qp->rumem,
 335                                                             qp->npages_send);
 336                 } else {
 337                         /* Ring state is always the first page. */
 338                         qp->sq.ring = qp->pdir.pages[0];
 339                         qp->rq.ring = is_srq ? NULL : &qp->sq.ring[1];
 340                 }
 341                 break;
 342         default:
 343                 ret = -EINVAL;
 344                 goto err_qp;
 345         }
 346
 347         /* Not supported */
 348         init_attr->cap.max_inline_data = 0;
 349
 350         memset(cmd, 0, sizeof(*cmd));
 351         cmd->hdr.cmd = PVRDMA_CMD_CREATE_QP;
 352         cmd->pd_handle = to_vpd(pd)->pd_handle;
 353         cmd->send_cq_handle = to_vcq(init_attr->send_cq)->cq_handle;
 354         cmd->recv_cq_handle = to_vcq(init_attr->recv_cq)->cq_handle;
 355         if (is_srq)
 356                 cmd->srq_handle = to_vsrq(init_attr->srq)->srq_handle;
 357         else
 358                 cmd->srq_handle = 0;
 359         cmd->max_send_wr = init_attr->cap.max_send_wr;
 360         cmd->max_recv_wr = init_attr->cap.max_recv_wr;
 361         cmd->max_send_sge = init_attr->cap.max_send_sge;
 362         cmd->max_recv_sge = init_attr->cap.max_recv_sge;
 363         cmd->max_inline_data = init_attr->cap.max_inline_data;
 364         cmd->sq_sig_all = (init_attr->sq_sig_type == IB_SIGNAL_ALL_WR) ? 1 : 0;
 365         cmd->qp_type = ib_qp_type_to_pvrdma(init_attr->qp_type);
 366         cmd->is_srq = is_srq;
 367         cmd->lkey = 0;
 368         cmd->access_flags = IB_ACCESS_LOCAL_WRITE;
 369         cmd->total_chunks = qp->npages;
 370         cmd->send_chunks = qp->npages_send - PVRDMA_QP_NUM_HEADER_PAGES;
 371         cmd->pdir_dma = qp->pdir.dir_dma;
 372
 373         dev_dbg(&dev->pdev->dev, "create queuepair with %d, %d, %d, %d\n",
 374                 cmd->max_send_wr, cmd->max_recv_wr, cmd->max_send_sge,
 375                 cmd->max_recv_sge);
 376
 377         ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_QP_RESP);
 378         if (ret < 0) {
 379                 dev_warn(&dev->pdev->dev,
 380                          "could not create queuepair, error: %d\n", ret);
 381                 goto err_pdir;
 382         }
 383
 384         /* max_send_wr/_recv_wr/_send_sge/_recv_sge/_inline_data */
 385         qp->qp_handle = resp->qpn;
 386         qp->port = init_attr->port_num;
 387         qp->ibqp.qp_num = resp->qpn;
 388         spin_lock_irqsave(&dev->qp_tbl_lock, flags);
 389         dev->qp_tbl[qp->qp_handle % dev->dsr->caps.max_qp] = qp;
 390         spin_unlock_irqrestore(&dev->qp_tbl_lock, flags);
 391
 392         return &qp->ibqp;
 393
 394 err_pdir:
 395         pvrdma_page_dir_cleanup(dev, &qp->pdir);
 396 err_umem:
 397         if (pd->uobject && udata) {
 398                 if (qp->rumem)
 399                         ib_umem_release(qp->rumem);
 400                 if (qp->sumem)
 401                         ib_umem_release(qp->sumem);
 402         }
 403 err_qp:
 404         kfree(qp);
 405         atomic_dec(&dev->num_qps);
 406
 407         return ERR_PTR(ret);
 408 }
 409
 410 static void pvrdma_free_qp(struct pvrdma_qp *qp)
 411 {
 412         struct pvrdma_dev *dev = to_vdev(qp->ibqp.device);
 413         struct pvrdma_cq *scq;
 414         struct pvrdma_cq *rcq;
 415         unsigned long flags, scq_flags, rcq_flags;
 416
 417         /* In case cq is polling */
 418         get_cqs(qp, &scq, &rcq);
 419         pvrdma_lock_cqs(scq, rcq, &scq_flags, &rcq_flags);
 420
 421         _pvrdma_flush_cqe(qp, scq);
 422         if (scq != rcq)
 423                 _pvrdma_flush_cqe(qp, rcq);
 424
 425         spin_lock_irqsave(&dev->qp_tbl_lock, flags);
 426         dev->qp_tbl[qp->qp_handle] = NULL;
 427         spin_unlock_irqrestore(&dev->qp_tbl_lock, flags);
 428
 429         pvrdma_unlock_cqs(scq, rcq, &scq_flags, &rcq_flags);
 430
 431         atomic_dec(&qp->refcnt);
 432         wait_event(qp->wait, !atomic_read(&qp->refcnt));
 433
 434         pvrdma_page_dir_cleanup(dev, &qp->pdir);
 435
 436         kfree(qp);
 437
 438         atomic_dec(&dev->num_qps);
 439 }
 440
 441 /**
 442  * pvrdma_destroy_qp - destroy a queue pair
 443  * @qp: the queue pair to destroy
 444  *
 445  * @return: 0 on success.
 446  */
 447 int pvrdma_destroy_qp(struct ib_qp *qp)
 448 {
 449         struct pvrdma_qp *vqp = to_vqp(qp);
 450         union pvrdma_cmd_req req;
 451         struct pvrdma_cmd_destroy_qp *cmd = &req.destroy_qp;
 452         int ret;
 453
 454         memset(cmd, 0, sizeof(*cmd));
 455         cmd->hdr.cmd = PVRDMA_CMD_DESTROY_QP;
 456         cmd->qp_handle = vqp->qp_handle;
 457
 458         ret = pvrdma_cmd_post(to_vdev(qp->device), &req, NULL, 0);
 459         if (ret < 0)
 460                 dev_warn(&to_vdev(qp->device)->pdev->dev,
 461                          "destroy queuepair failed, error: %d\n", ret);
 462
 463         pvrdma_free_qp(vqp);
 464
 465         return 0;
 466 }
 467
 468 /**
 469  * pvrdma_modify_qp - modify queue pair attributes
 470  * @ibqp: the queue pair
 471  * @attr: the new queue pair's attributes
 472  * @attr_mask: attributes mask
 473  * @udata: user data
 474  *
 475  * @returns 0 on success, otherwise returns an errno.
 476  */
 477 int pvrdma_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
 478                      int attr_mask, struct ib_udata *udata)
 479 {
 480         struct pvrdma_dev *dev = to_vdev(ibqp->device);
 481         struct pvrdma_qp *qp = to_vqp(ibqp);
 482         union pvrdma_cmd_req req;
 483         union pvrdma_cmd_resp rsp;
 484         struct pvrdma_cmd_modify_qp *cmd = &req.modify_qp;
 485         int cur_state, next_state;
 486         int ret;
 487
 488         /* Sanity checking. Should need lock here */
 489         mutex_lock(&qp->mutex);
 490         cur_state = (attr_mask & IB_QP_CUR_STATE) ? attr->cur_qp_state :
 491                 qp->state;
 492         next_state = (attr_mask & IB_QP_STATE) ? attr->qp_state : cur_state;
 493
 494         if (!ib_modify_qp_is_ok(cur_state, next_state, ibqp->qp_type,
 495                                 attr_mask, IB_LINK_LAYER_ETHERNET)) {
 496                 ret = -EINVAL;
 497                 goto out;
 498         }
 499
 500         if (attr_mask & IB_QP_PORT) {
 501                 if (attr->port_num == 0 ||
 502                     attr->port_num > ibqp->device->phys_port_cnt) {
 503                         ret = -EINVAL;
 504                         goto out;
 505                 }
 506         }
 507
 508         if (attr_mask & IB_QP_MIN_RNR_TIMER) {
 509                 if (attr->min_rnr_timer > 31) {
 510                         ret = -EINVAL;
 511                         goto out;
 512                 }
 513         }
 514
 515         if (attr_mask & IB_QP_PKEY_INDEX) {
 516                 if (attr->pkey_index >= dev->dsr->caps.max_pkeys) {
 517                         ret = -EINVAL;
 518                         goto out;
 519                 }
 520         }
 521
 522         if (attr_mask & IB_QP_QKEY)
 523                 qp->qkey = attr->qkey;
 524
 525         if (cur_state == next_state && cur_state == IB_QPS_RESET) {
 526                 ret = 0;
 527                 goto out;
 528         }
 529
 530         qp->state = next_state;
 531         memset(cmd, 0, sizeof(*cmd));
 532         cmd->hdr.cmd = PVRDMA_CMD_MODIFY_QP;
 533         cmd->qp_handle = qp->qp_handle;
 534         cmd->attr_mask = ib_qp_attr_mask_to_pvrdma(attr_mask);
 535         cmd->attrs.qp_state = ib_qp_state_to_pvrdma(attr->qp_state);
 536         cmd->attrs.cur_qp_state =
 537                 ib_qp_state_to_pvrdma(attr->cur_qp_state);
 538         cmd->attrs.path_mtu = ib_mtu_to_pvrdma(attr->path_mtu);
 539         cmd->attrs.path_mig_state =
 540                 ib_mig_state_to_pvrdma(attr->path_mig_state);
 541         cmd->attrs.qkey = attr->qkey;
 542         cmd->attrs.rq_psn = attr->rq_psn;
 543         cmd->attrs.sq_psn = attr->sq_psn;
 544         cmd->attrs.dest_qp_num = attr->dest_qp_num;
 545         cmd->attrs.qp_access_flags =
 546                 ib_access_flags_to_pvrdma(attr->qp_access_flags);
 547         cmd->attrs.pkey_index = attr->pkey_index;
 548         cmd->attrs.alt_pkey_index = attr->alt_pkey_index;
 549         cmd->attrs.en_sqd_async_notify = attr->en_sqd_async_notify;
 550         cmd->attrs.sq_draining = attr->sq_draining;
 551         cmd->attrs.max_rd_atomic = attr->max_rd_atomic;
 552         cmd->attrs.max_dest_rd_atomic = attr->max_dest_rd_atomic;
 553         cmd->attrs.min_rnr_timer = attr->min_rnr_timer;
 554         cmd->attrs.port_num = attr->port_num;
 555         cmd->attrs.timeout = attr->timeout;
 556         cmd->attrs.retry_cnt = attr->retry_cnt;
 557         cmd->attrs.rnr_retry = attr->rnr_retry;
 558         cmd->attrs.alt_port_num = attr->alt_port_num;
 559         cmd->attrs.alt_timeout = attr->alt_timeout;
 560         ib_qp_cap_to_pvrdma(&cmd->attrs.cap, &attr->cap);
 561         rdma_ah_attr_to_pvrdma(&cmd->attrs.ah_attr, &attr->ah_attr);
 562         rdma_ah_attr_to_pvrdma(&cmd->attrs.alt_ah_attr, &attr->alt_ah_attr);
 563
 564         ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_MODIFY_QP_RESP);
 565         if (ret < 0) {
 566                 dev_warn(&dev->pdev->dev,
 567                          "could not modify queuepair, error: %d\n", ret);
 568         } else if (rsp.hdr.err > 0) {
 569                 dev_warn(&dev->pdev->dev,
 570                          "cannot modify queuepair, error: %d\n", rsp.hdr.err);
 571                 ret = -EINVAL;
 572         }
 573
 574         if (ret == 0 && next_state == IB_QPS_RESET)
 575                 pvrdma_reset_qp(qp);
 576
 577 out:
 578         mutex_unlock(&qp->mutex);
 579
 580         return ret;
 581 }
 582
 583 static inline void *get_sq_wqe(struct pvrdma_qp *qp, unsigned int n)
 584 {
 585         return pvrdma_page_dir_get_ptr(&qp->pdir,
 586                                        qp->sq.offset + n * qp->sq.wqe_size);
 587 }
 588
 589 static inline void *get_rq_wqe(struct pvrdma_qp *qp, unsigned int n)
 590 {
 591         return pvrdma_page_dir_get_ptr(&qp->pdir,
 592                                        qp->rq.offset + n * qp->rq.wqe_size);
 593 }
 594
 595 static int set_reg_seg(struct pvrdma_sq_wqe_hdr *wqe_hdr, struct ib_reg_wr *wr)
 596 {
 597         struct pvrdma_user_mr *mr = to_vmr(wr->mr);
 598
 599         wqe_hdr->wr.fast_reg.iova_start = mr->ibmr.iova;
 600         wqe_hdr->wr.fast_reg.pl_pdir_dma = mr->pdir.dir_dma;
 601         wqe_hdr->wr.fast_reg.page_shift = mr->page_shift;
 602         wqe_hdr->wr.fast_reg.page_list_len = mr->npages;
 603         wqe_hdr->wr.fast_reg.length = mr->ibmr.length;
 604         wqe_hdr->wr.fast_reg.access_flags = wr->access;
 605         wqe_hdr->wr.fast_reg.rkey = wr->key;
 606
 607         return pvrdma_page_dir_insert_page_list(&mr->pdir, mr->pages,
 608                                                 mr->npages);
 609 }
 610
 611 /**
 612  * pvrdma_post_send - post send work request entries on a QP
 613  * @ibqp: the QP
 614  * @wr: work request list to post
 615  * @bad_wr: the first bad WR returned
 616  *
 617  * @return: 0 on success, otherwise errno returned.
 618  */
 619 int pvrdma_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
 620                      struct ib_send_wr **bad_wr)
 621 {
 622         struct pvrdma_qp *qp = to_vqp(ibqp);
 623         struct pvrdma_dev *dev = to_vdev(ibqp->device);
 624         unsigned long flags;
 625         struct pvrdma_sq_wqe_hdr *wqe_hdr;
 626         struct pvrdma_sge *sge;
 627         int i, ret;
 628
 629         /*
 630          * In states lower than RTS, we can fail immediately. In other states,
 631          * just post and let the device figure it out.
 632          */
 633         if (qp->state < IB_QPS_RTS) {
 634                 *bad_wr = wr;
 635                 return -EINVAL;
 636         }
 637
 638         spin_lock_irqsave(&qp->sq.lock, flags);
 639
 640         while (wr) {
 641                 unsigned int tail = 0;
 642
 643                 if (unlikely(!pvrdma_idx_ring_has_space(
 644                                 qp->sq.ring, qp->sq.wqe_cnt, &tail))) {
 645                         dev_warn_ratelimited(&dev->pdev->dev,
 646                                              "send queue is full\n");
 647                         *bad_wr = wr;
 648                         ret = -ENOMEM;
 649                         goto out;
 650                 }
 651
 652                 if (unlikely(wr->num_sge > qp->sq.max_sg || wr->num_sge < 0)) {
 653                         dev_warn_ratelimited(&dev->pdev->dev,
 654                                              "send SGE overflow\n");
 655                         *bad_wr = wr;
 656                         ret = -EINVAL;
 657                         goto out;
 658                 }
 659
 660                 if (unlikely(wr->opcode < 0)) {
 661                         dev_warn_ratelimited(&dev->pdev->dev,
 662                                              "invalid send opcode\n");
 663                         *bad_wr = wr;
 664                         ret = -EINVAL;
 665                         goto out;
 666                 }
 667
 668                 /*
 669                  * Only support UD, RC.
 670                  * Need to check opcode table for thorough checking.
 671                  * opcode               _UD     _UC     _RC
 672                  * _SEND                x       x       x
 673                  * _SEND_WITH_IMM       x       x       x
 674                  * _RDMA_WRITE                  x       x
 675                  * _RDMA_WRITE_WITH_IMM         x       x
 676                  * _LOCAL_INV                   x       x
 677                  * _SEND_WITH_INV               x       x
 678                  * _RDMA_READ                           x
 679                  * _ATOMIC_CMP_AND_SWP                  x
 680                  * _ATOMIC_FETCH_AND_ADD                x
 681                  * _MASK_ATOMIC_CMP_AND_SWP             x
 682                  * _MASK_ATOMIC_FETCH_AND_ADD           x
 683                  * _REG_MR                              x
 684                  *
 685                  */
 686                 if (qp->ibqp.qp_type != IB_QPT_UD &&
 687                     qp->ibqp.qp_type != IB_QPT_RC &&
 688                         wr->opcode != IB_WR_SEND) {
 689                         dev_warn_ratelimited(&dev->pdev->dev,
 690                                              "unsupported queuepair type\n");
 691                         *bad_wr = wr;
 692                         ret = -EINVAL;
 693                         goto out;
 694                 } else if (qp->ibqp.qp_type == IB_QPT_UD ||
 695                            qp->ibqp.qp_type == IB_QPT_GSI) {
 696                         if (wr->opcode != IB_WR_SEND &&
 697                             wr->opcode != IB_WR_SEND_WITH_IMM) {
 698                                 dev_warn_ratelimited(&dev->pdev->dev,
 699                                                      "invalid send opcode\n");
 700                                 *bad_wr = wr;
 701                                 ret = -EINVAL;
 702                                 goto out;
 703                         }
 704                 }
 705
 706                 wqe_hdr = (struct pvrdma_sq_wqe_hdr *)get_sq_wqe(qp, tail);
 707                 memset(wqe_hdr, 0, sizeof(*wqe_hdr));
 708                 wqe_hdr->wr_id = wr->wr_id;
 709                 wqe_hdr->num_sge = wr->num_sge;
 710                 wqe_hdr->opcode = ib_wr_opcode_to_pvrdma(wr->opcode);
 711                 wqe_hdr->send_flags = ib_send_flags_to_pvrdma(wr->send_flags);
 712                 if (wr->opcode == IB_WR_SEND_WITH_IMM ||
 713                     wr->opcode == IB_WR_RDMA_WRITE_WITH_IMM)
 714                         wqe_hdr->ex.imm_data = wr->ex.imm_data;
 715
 716                 switch (qp->ibqp.qp_type) {
 717                 case IB_QPT_GSI:
 718                 case IB_QPT_UD:
 719                         if (unlikely(!ud_wr(wr)->ah)) {
 720                                 dev_warn_ratelimited(&dev->pdev->dev,
 721                                                      "invalid address handle\n");
 722                                 *bad_wr = wr;
 723                                 ret = -EINVAL;
 724                                 goto out;
 725                         }
 726
 727                         /*
 728                          * Use qkey from qp context if high order bit set,
 729                          * otherwise from work request.
 730                          */
 731                         wqe_hdr->wr.ud.remote_qpn = ud_wr(wr)->remote_qpn;
 732                         wqe_hdr->wr.ud.remote_qkey =
 733                                 ud_wr(wr)->remote_qkey & 0x80000000 ?
 734                                 qp->qkey : ud_wr(wr)->remote_qkey;
 735                         wqe_hdr->wr.ud.av = to_vah(ud_wr(wr)->ah)->av;
 736
 737                         break;
 738                 case IB_QPT_RC:
 739                         switch (wr->opcode) {
 740                         case IB_WR_RDMA_READ:
 741                         case IB_WR_RDMA_WRITE:
 742                         case IB_WR_RDMA_WRITE_WITH_IMM:
 743                                 wqe_hdr->wr.rdma.remote_addr =
 744                                         rdma_wr(wr)->remote_addr;
 745                                 wqe_hdr->wr.rdma.rkey = rdma_wr(wr)->rkey;
 746                                 break;
 747                         case IB_WR_LOCAL_INV:
 748                         case IB_WR_SEND_WITH_INV:
 749                                 wqe_hdr->ex.invalidate_rkey =
 750                                         wr->ex.invalidate_rkey;
 751                                 break;
 752                         case IB_WR_ATOMIC_CMP_AND_SWP:
 753                         case IB_WR_ATOMIC_FETCH_AND_ADD:
 754                                 wqe_hdr->wr.atomic.remote_addr =
 755                                         atomic_wr(wr)->remote_addr;
 756                                 wqe_hdr->wr.atomic.rkey = atomic_wr(wr)->rkey;
 757                                 wqe_hdr->wr.atomic.compare_add =
 758                                         atomic_wr(wr)->compare_add;
 759                                 if (wr->opcode == IB_WR_ATOMIC_CMP_AND_SWP)
 760                                         wqe_hdr->wr.atomic.swap =
 761                                                 atomic_wr(wr)->swap;
 762                                 break;
 763                         case IB_WR_REG_MR:
 764                                 ret = set_reg_seg(wqe_hdr, reg_wr(wr));
 765                                 if (ret < 0) {
 766                                         dev_warn_ratelimited(&dev->pdev->dev,
 767                                                              "Failed to set fast register work request\n");
 768                                         *bad_wr = wr;
 769                                         goto out;
 770                                 }
 771                                 break;
 772                         default:
 773                                 break;
 774                         }
 775
 776                         break;
 777                 default:
 778                         dev_warn_ratelimited(&dev->pdev->dev,
 779                                              "invalid queuepair type\n");
 780                         ret = -EINVAL;
 781                         *bad_wr = wr;
 782                         goto out;
 783                 }
 784
 785                 sge = (struct pvrdma_sge *)(wqe_hdr + 1);
 786                 for (i = 0; i < wr->num_sge; i++) {
 787                         /* Need to check wqe_size 0 or max size */
 788                         sge->addr = wr->sg_list[i].addr;
 789                         sge->length = wr->sg_list[i].length;
 790                         sge->lkey = wr->sg_list[i].lkey;
 791                         sge++;
 792                 }
 793
 794                 /* Make sure wqe is written before index update */
 795                 smp_wmb();
 796
 797                 /* Update shared sq ring */
 798                 pvrdma_idx_ring_inc(&qp->sq.ring->prod_tail,
 799                                     qp->sq.wqe_cnt);
 800
 801                 wr = wr->next;
 802         }
 803
 804         ret = 0;
 805
 806 out:
 807         spin_unlock_irqrestore(&qp->sq.lock, flags);
 808
 809         if (!ret)
 810                 pvrdma_write_uar_qp(dev, PVRDMA_UAR_QP_SEND | qp->qp_handle);
 811
 812         return ret;
 813 }
 814
 815 /**
 816  * pvrdma_post_receive - post receive work request entries on a QP
 817  * @ibqp: the QP
 818  * @wr: the work request list to post
 819  * @bad_wr: the first bad WR returned
 820  *
 821  * @return: 0 on success, otherwise errno returned.
 822  */
 823 int pvrdma_post_recv(struct ib_qp *ibqp, struct ib_recv_wr *wr,
 824                      struct ib_recv_wr **bad_wr)
 825 {
 826         struct pvrdma_dev *dev = to_vdev(ibqp->device);
 827         unsigned long flags;
 828         struct pvrdma_qp *qp = to_vqp(ibqp);
 829         struct pvrdma_rq_wqe_hdr *wqe_hdr;
 830         struct pvrdma_sge *sge;
 831         int ret = 0;
 832         int i;
 833
 834         /*
 835          * In the RESET state, we can fail immediately. For other states,
 836          * just post and let the device figure it out.
 837          */
 838         if (qp->state == IB_QPS_RESET) {
 839                 *bad_wr = wr;
 840                 return -EINVAL;
 841         }
 842
 843         if (qp->srq) {
 844                 dev_warn(&dev->pdev->dev, "QP associated with SRQ\n");
 845                 *bad_wr = wr;
 846                 return -EINVAL;
 847         }
 848
 849         spin_lock_irqsave(&qp->rq.lock, flags);
 850
 851         while (wr) {
 852                 unsigned int tail = 0;
 853
 854                 if (unlikely(wr->num_sge > qp->rq.max_sg ||
 855                              wr->num_sge < 0)) {
 856                         ret = -EINVAL;
 857                         *bad_wr = wr;
 858                         dev_warn_ratelimited(&dev->pdev->dev,
 859                                              "recv SGE overflow\n");
 860                         goto out;
 861                 }
 862
 863                 if (unlikely(!pvrdma_idx_ring_has_space(
 864                                 qp->rq.ring, qp->rq.wqe_cnt, &tail))) {
 865                         ret = -ENOMEM;
 866                         *bad_wr = wr;
 867                         dev_warn_ratelimited(&dev->pdev->dev,
 868                                              "recv queue full\n");
 869                         goto out;
 870                 }
 871
 872                 wqe_hdr = (struct pvrdma_rq_wqe_hdr *)get_rq_wqe(qp, tail);
 873                 wqe_hdr->wr_id = wr->wr_id;
 874                 wqe_hdr->num_sge = wr->num_sge;
 875                 wqe_hdr->total_len = 0;
 876
 877                 sge = (struct pvrdma_sge *)(wqe_hdr + 1);
 878                 for (i = 0; i < wr->num_sge; i++) {
 879                         sge->addr = wr->sg_list[i].addr;
 880                         sge->length = wr->sg_list[i].length;
 881                         sge->lkey = wr->sg_list[i].lkey;
 882                         sge++;
 883                 }
 884
 885                 /* Make sure wqe is written before index update */
 886                 smp_wmb();
 887
 888                 /* Update shared rq ring */
 889                 pvrdma_idx_ring_inc(&qp->rq.ring->prod_tail,
 890                                     qp->rq.wqe_cnt);
 891
 892                 wr = wr->next;
 893         }
 894
 895         spin_unlock_irqrestore(&qp->rq.lock, flags);
 896
 897         pvrdma_write_uar_qp(dev, PVRDMA_UAR_QP_RECV | qp->qp_handle);
 898
 899         return ret;
 900
 901 out:
 902         spin_unlock_irqrestore(&qp->rq.lock, flags);
 903
 904         return ret;
 905 }
 906
 907 /**
 908  * pvrdma_query_qp - query a queue pair's attributes
 909  * @ibqp: the queue pair to query
 910  * @attr: the queue pair's attributes
 911  * @attr_mask: attributes mask
 912  * @init_attr: initial queue pair attributes
 913  *
 914  * @returns 0 on success, otherwise returns an errno.
 915  */
 916 int pvrdma_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
 917                     int attr_mask, struct ib_qp_init_attr *init_attr)
 918 {
 919         struct pvrdma_dev *dev = to_vdev(ibqp->device);
 920         struct pvrdma_qp *qp = to_vqp(ibqp);
 921         union pvrdma_cmd_req req;
 922         union pvrdma_cmd_resp rsp;
 923         struct pvrdma_cmd_query_qp *cmd = &req.query_qp;
 924         struct pvrdma_cmd_query_qp_resp *resp = &rsp.query_qp_resp;
 925         int ret = 0;
 926
 927         mutex_lock(&qp->mutex);
 928
 929         if (qp->state == IB_QPS_RESET) {
 930                 attr->qp_state = IB_QPS_RESET;
 931                 goto out;
 932         }
 933
 934         memset(cmd, 0, sizeof(*cmd));
 935         cmd->hdr.cmd = PVRDMA_CMD_QUERY_QP;
 936         cmd->qp_handle = qp->qp_handle;
 937         cmd->attr_mask = ib_qp_attr_mask_to_pvrdma(attr_mask);
 938
 939         ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_QUERY_QP_RESP);
 940         if (ret < 0) {
 941                 dev_warn(&dev->pdev->dev,
 942                          "could not query queuepair, error: %d\n", ret);
 943                 goto out;
 944         }
 945
 946         attr->qp_state = pvrdma_qp_state_to_ib(resp->attrs.qp_state);
 947         attr->cur_qp_state =
 948                 pvrdma_qp_state_to_ib(resp->attrs.cur_qp_state);
 949         attr->path_mtu = pvrdma_mtu_to_ib(resp->attrs.path_mtu);
 950         attr->path_mig_state =
 951                 pvrdma_mig_state_to_ib(resp->attrs.path_mig_state);
 952         attr->qkey = resp->attrs.qkey;
 953         attr->rq_psn = resp->attrs.rq_psn;
 954         attr->sq_psn = resp->attrs.sq_psn;
 955         attr->dest_qp_num = resp->attrs.dest_qp_num;
 956         attr->qp_access_flags =
 957                 pvrdma_access_flags_to_ib(resp->attrs.qp_access_flags);
 958         attr->pkey_index = resp->attrs.pkey_index;
 959         attr->alt_pkey_index = resp->attrs.alt_pkey_index;
 960         attr->en_sqd_async_notify = resp->attrs.en_sqd_async_notify;
 961         attr->sq_draining = resp->attrs.sq_draining;
 962         attr->max_rd_atomic = resp->attrs.max_rd_atomic;
 963         attr->max_dest_rd_atomic = resp->attrs.max_dest_rd_atomic;
 964         attr->min_rnr_timer = resp->attrs.min_rnr_timer;
 965         attr->port_num = resp->attrs.port_num;
 966         attr->timeout = resp->attrs.timeout;
 967         attr->retry_cnt = resp->attrs.retry_cnt;
 968         attr->rnr_retry = resp->attrs.rnr_retry;
 969         attr->alt_port_num = resp->attrs.alt_port_num;
 970         attr->alt_timeout = resp->attrs.alt_timeout;
 971         pvrdma_qp_cap_to_ib(&attr->cap, &resp->attrs.cap);
 972         pvrdma_ah_attr_to_rdma(&attr->ah_attr, &resp->attrs.ah_attr);
 973         pvrdma_ah_attr_to_rdma(&attr->alt_ah_attr, &resp->attrs.alt_ah_attr);
 974
 975         qp->state = attr->qp_state;
 976
 977         ret = 0;
 978
 979 out:
 980         attr->cur_qp_state = attr->qp_state;
 981
 982         init_attr->event_handler = qp->ibqp.event_handler;
 983         init_attr->qp_context = qp->ibqp.qp_context;
 984         init_attr->send_cq = qp->ibqp.send_cq;
 985         init_attr->recv_cq = qp->ibqp.recv_cq;
 986         init_attr->srq = qp->ibqp.srq;
 987         init_attr->xrcd = NULL;
 988         init_attr->cap = attr->cap;
 989         init_attr->sq_sig_type = 0;
 990         init_attr->qp_type = qp->ibqp.qp_type;
 991         init_attr->create_flags = 0;
 992         init_attr->port_num = qp->port;
 993
 994         mutex_unlock(&qp->mutex);
 995         return ret;
 996 }