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         pvrdma_page_dir_cleanup(dev, &qp->pdir);
 410
 411         kfree(qp);
 412
 413         atomic_dec(&dev->num_qps);
 414 }
 415
 416 /**
 417  * pvrdma_destroy_qp - destroy a queue pair
 418  * @qp: the queue pair to destroy
 419  *
 420  * @return: 0 on success.
 421  */
 422 int pvrdma_destroy_qp(struct ib_qp *qp)
 423 {
 424         struct pvrdma_qp *vqp = to_vqp(qp);
 425         union pvrdma_cmd_req req;
 426         struct pvrdma_cmd_destroy_qp *cmd = &req.destroy_qp;
 427         int ret;
 428
 429         memset(cmd, 0, sizeof(*cmd));
 430         cmd->hdr.cmd = PVRDMA_CMD_DESTROY_QP;
 431         cmd->qp_handle = vqp->qp_handle;
 432
 433         ret = pvrdma_cmd_post(to_vdev(qp->device), &req, NULL, 0);
 434         if (ret < 0)
 435                 dev_warn(&to_vdev(qp->device)->pdev->dev,
 436                          "destroy queuepair failed, error: %d\n", ret);
 437
 438         pvrdma_free_qp(vqp);
 439
 440         return 0;
 441 }
 442
 443 /**
 444  * pvrdma_modify_qp - modify queue pair attributes
 445  * @ibqp: the queue pair
 446  * @attr: the new queue pair's attributes
 447  * @attr_mask: attributes mask
 448  * @udata: user data
 449  *
 450  * @returns 0 on success, otherwise returns an errno.
 451  */
 452 int pvrdma_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
 453                      int attr_mask, struct ib_udata *udata)
 454 {
 455         struct pvrdma_dev *dev = to_vdev(ibqp->device);
 456         struct pvrdma_qp *qp = to_vqp(ibqp);
 457         union pvrdma_cmd_req req;
 458         union pvrdma_cmd_resp rsp;
 459         struct pvrdma_cmd_modify_qp *cmd = &req.modify_qp;
 460         int cur_state, next_state;
 461         int ret;
 462
 463         /* Sanity checking. Should need lock here */
 464         mutex_lock(&qp->mutex);
 465         cur_state = (attr_mask & IB_QP_CUR_STATE) ? attr->cur_qp_state :
 466                 qp->state;
 467         next_state = (attr_mask & IB_QP_STATE) ? attr->qp_state : cur_state;
 468
 469         if (!ib_modify_qp_is_ok(cur_state, next_state, ibqp->qp_type,
 470                                 attr_mask, IB_LINK_LAYER_ETHERNET)) {
 471                 ret = -EINVAL;
 472                 goto out;
 473         }
 474
 475         if (attr_mask & IB_QP_PORT) {
 476                 if (attr->port_num == 0 ||
 477                     attr->port_num > ibqp->device->phys_port_cnt) {
 478                         ret = -EINVAL;
 479                         goto out;
 480                 }
 481         }
 482
 483         if (attr_mask & IB_QP_MIN_RNR_TIMER) {
 484                 if (attr->min_rnr_timer > 31) {
 485                         ret = -EINVAL;
 486                         goto out;
 487                 }
 488         }
 489
 490         if (attr_mask & IB_QP_PKEY_INDEX) {
 491                 if (attr->pkey_index >= dev->dsr->caps.max_pkeys) {
 492                         ret = -EINVAL;
 493                         goto out;
 494                 }
 495         }
 496
 497         if (attr_mask & IB_QP_QKEY)
 498                 qp->qkey = attr->qkey;
 499
 500         if (cur_state == next_state && cur_state == IB_QPS_RESET) {
 501                 ret = 0;
 502                 goto out;
 503         }
 504
 505         qp->state = next_state;
 506         memset(cmd, 0, sizeof(*cmd));
 507         cmd->hdr.cmd = PVRDMA_CMD_MODIFY_QP;
 508         cmd->qp_handle = qp->qp_handle;
 509         cmd->attr_mask = ib_qp_attr_mask_to_pvrdma(attr_mask);
 510         cmd->attrs.qp_state = ib_qp_state_to_pvrdma(attr->qp_state);
 511         cmd->attrs.cur_qp_state =
 512                 ib_qp_state_to_pvrdma(attr->cur_qp_state);
 513         cmd->attrs.path_mtu = ib_mtu_to_pvrdma(attr->path_mtu);
 514         cmd->attrs.path_mig_state =
 515                 ib_mig_state_to_pvrdma(attr->path_mig_state);
 516         cmd->attrs.qkey = attr->qkey;
 517         cmd->attrs.rq_psn = attr->rq_psn;
 518         cmd->attrs.sq_psn = attr->sq_psn;
 519         cmd->attrs.dest_qp_num = attr->dest_qp_num;
 520         cmd->attrs.qp_access_flags =
 521                 ib_access_flags_to_pvrdma(attr->qp_access_flags);
 522         cmd->attrs.pkey_index = attr->pkey_index;
 523         cmd->attrs.alt_pkey_index = attr->alt_pkey_index;
 524         cmd->attrs.en_sqd_async_notify = attr->en_sqd_async_notify;
 525         cmd->attrs.sq_draining = attr->sq_draining;
 526         cmd->attrs.max_rd_atomic = attr->max_rd_atomic;
 527         cmd->attrs.max_dest_rd_atomic = attr->max_dest_rd_atomic;
 528         cmd->attrs.min_rnr_timer = attr->min_rnr_timer;
 529         cmd->attrs.port_num = attr->port_num;
 530         cmd->attrs.timeout = attr->timeout;
 531         cmd->attrs.retry_cnt = attr->retry_cnt;
 532         cmd->attrs.rnr_retry = attr->rnr_retry;
 533         cmd->attrs.alt_port_num = attr->alt_port_num;
 534         cmd->attrs.alt_timeout = attr->alt_timeout;
 535         ib_qp_cap_to_pvrdma(&cmd->attrs.cap, &attr->cap);
 536         ib_ah_attr_to_pvrdma(&cmd->attrs.ah_attr, &attr->ah_attr);
 537         ib_ah_attr_to_pvrdma(&cmd->attrs.alt_ah_attr, &attr->alt_ah_attr);
 538
 539         ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_MODIFY_QP_RESP);
 540         if (ret < 0) {
 541                 dev_warn(&dev->pdev->dev,
 542                          "could not modify queuepair, error: %d\n", ret);
 543         } else if (rsp.hdr.err > 0) {
 544                 dev_warn(&dev->pdev->dev,
 545                          "cannot modify queuepair, error: %d\n", rsp.hdr.err);
 546                 ret = -EINVAL;
 547         }
 548
 549         if (ret == 0 && next_state == IB_QPS_RESET)
 550                 pvrdma_reset_qp(qp);
 551
 552 out:
 553         mutex_unlock(&qp->mutex);
 554
 555         return ret;
 556 }
 557
 558 static inline void *get_sq_wqe(struct pvrdma_qp *qp, unsigned int n)
 559 {
 560         return pvrdma_page_dir_get_ptr(&qp->pdir,
 561                                        qp->sq.offset + n * qp->sq.wqe_size);
 562 }
 563
 564 static inline void *get_rq_wqe(struct pvrdma_qp *qp, unsigned int n)
 565 {
 566         return pvrdma_page_dir_get_ptr(&qp->pdir,
 567                                        qp->rq.offset + n * qp->rq.wqe_size);
 568 }
 569
 570 static int set_reg_seg(struct pvrdma_sq_wqe_hdr *wqe_hdr, struct ib_reg_wr *wr)
 571 {
 572         struct pvrdma_user_mr *mr = to_vmr(wr->mr);
 573
 574         wqe_hdr->wr.fast_reg.iova_start = mr->ibmr.iova;
 575         wqe_hdr->wr.fast_reg.pl_pdir_dma = mr->pdir.dir_dma;
 576         wqe_hdr->wr.fast_reg.page_shift = mr->page_shift;
 577         wqe_hdr->wr.fast_reg.page_list_len = mr->npages;
 578         wqe_hdr->wr.fast_reg.length = mr->ibmr.length;
 579         wqe_hdr->wr.fast_reg.access_flags = wr->access;
 580         wqe_hdr->wr.fast_reg.rkey = wr->key;
 581
 582         return pvrdma_page_dir_insert_page_list(&mr->pdir, mr->pages,
 583                                                 mr->npages);
 584 }
 585
 586 /**
 587  * pvrdma_post_send - post send work request entries on a QP
 588  * @ibqp: the QP
 589  * @wr: work request list to post
 590  * @bad_wr: the first bad WR returned
 591  *
 592  * @return: 0 on success, otherwise errno returned.
 593  */
 594 int pvrdma_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
 595                      struct ib_send_wr **bad_wr)
 596 {
 597         struct pvrdma_qp *qp = to_vqp(ibqp);
 598         struct pvrdma_dev *dev = to_vdev(ibqp->device);
 599         unsigned long flags;
 600         struct pvrdma_sq_wqe_hdr *wqe_hdr;
 601         struct pvrdma_sge *sge;
 602         int i, ret;
 603
 604         /*
 605          * In states lower than RTS, we can fail immediately. In other states,
 606          * just post and let the device figure it out.
 607          */
 608         if (qp->state < IB_QPS_RTS) {
 609                 *bad_wr = wr;
 610                 return -EINVAL;
 611         }
 612
 613         spin_lock_irqsave(&qp->sq.lock, flags);
 614
 615         while (wr) {
 616                 unsigned int tail = 0;
 617
 618                 if (unlikely(!pvrdma_idx_ring_has_space(
 619                                 qp->sq.ring, qp->sq.wqe_cnt, &tail))) {
 620                         dev_warn_ratelimited(&dev->pdev->dev,
 621                                              "send queue is full\n");
 622                         *bad_wr = wr;
 623                         ret = -ENOMEM;
 624                         goto out;
 625                 }
 626
 627                 if (unlikely(wr->num_sge > qp->sq.max_sg || wr->num_sge < 0)) {
 628                         dev_warn_ratelimited(&dev->pdev->dev,
 629                                              "send SGE overflow\n");
 630                         *bad_wr = wr;
 631                         ret = -EINVAL;
 632                         goto out;
 633                 }
 634
 635                 if (unlikely(wr->opcode < 0)) {
 636                         dev_warn_ratelimited(&dev->pdev->dev,
 637                                              "invalid send opcode\n");
 638                         *bad_wr = wr;
 639                         ret = -EINVAL;
 640                         goto out;
 641                 }
 642
 643                 /*
 644                  * Only support UD, RC.
 645                  * Need to check opcode table for thorough checking.
 646                  * opcode               _UD     _UC     _RC
 647                  * _SEND                x       x       x
 648                  * _SEND_WITH_IMM       x       x       x
 649                  * _RDMA_WRITE                  x       x
 650                  * _RDMA_WRITE_WITH_IMM         x       x
 651                  * _LOCAL_INV                   x       x
 652                  * _SEND_WITH_INV               x       x
 653                  * _RDMA_READ                           x
 654                  * _ATOMIC_CMP_AND_SWP                  x
 655                  * _ATOMIC_FETCH_AND_ADD                x
 656                  * _MASK_ATOMIC_CMP_AND_SWP             x
 657                  * _MASK_ATOMIC_FETCH_AND_ADD           x
 658                  * _REG_MR                              x
 659                  *
 660                  */
 661                 if (qp->ibqp.qp_type != IB_QPT_UD &&
 662                     qp->ibqp.qp_type != IB_QPT_RC &&
 663                         wr->opcode != IB_WR_SEND) {
 664                         dev_warn_ratelimited(&dev->pdev->dev,
 665                                              "unsupported queuepair type\n");
 666                         *bad_wr = wr;
 667                         ret = -EINVAL;
 668                         goto out;
 669                 } else if (qp->ibqp.qp_type == IB_QPT_UD ||
 670                            qp->ibqp.qp_type == IB_QPT_GSI) {
 671                         if (wr->opcode != IB_WR_SEND &&
 672                             wr->opcode != IB_WR_SEND_WITH_IMM) {
 673                                 dev_warn_ratelimited(&dev->pdev->dev,
 674                                                      "invalid send opcode\n");
 675                                 *bad_wr = wr;
 676                                 ret = -EINVAL;
 677                                 goto out;
 678                         }
 679                 }
 680
 681                 wqe_hdr = (struct pvrdma_sq_wqe_hdr *)get_sq_wqe(qp, tail);
 682                 memset(wqe_hdr, 0, sizeof(*wqe_hdr));
 683                 wqe_hdr->wr_id = wr->wr_id;
 684                 wqe_hdr->num_sge = wr->num_sge;
 685                 wqe_hdr->opcode = ib_wr_opcode_to_pvrdma(wr->opcode);
 686                 wqe_hdr->send_flags = ib_send_flags_to_pvrdma(wr->send_flags);
 687                 if (wr->opcode == IB_WR_SEND_WITH_IMM ||
 688                     wr->opcode == IB_WR_RDMA_WRITE_WITH_IMM)
 689                         wqe_hdr->ex.imm_data = wr->ex.imm_data;
 690
 691                 switch (qp->ibqp.qp_type) {
 692                 case IB_QPT_GSI:
 693                 case IB_QPT_UD:
 694                         if (unlikely(!ud_wr(wr)->ah)) {
 695                                 dev_warn_ratelimited(&dev->pdev->dev,
 696                                                      "invalid address handle\n");
 697                                 *bad_wr = wr;
 698                                 ret = -EINVAL;
 699                                 goto out;
 700                         }
 701
 702                         /*
 703                          * Use qkey from qp context if high order bit set,
 704                          * otherwise from work request.
 705                          */
 706                         wqe_hdr->wr.ud.remote_qpn = ud_wr(wr)->remote_qpn;
 707                         wqe_hdr->wr.ud.remote_qkey =
 708                                 ud_wr(wr)->remote_qkey & 0x80000000 ?
 709                                 qp->qkey : ud_wr(wr)->remote_qkey;
 710                         wqe_hdr->wr.ud.av = to_vah(ud_wr(wr)->ah)->av;
 711
 712                         break;
 713                 case IB_QPT_RC:
 714                         switch (wr->opcode) {
 715                         case IB_WR_RDMA_READ:
 716                         case IB_WR_RDMA_WRITE:
 717                         case IB_WR_RDMA_WRITE_WITH_IMM:
 718                                 wqe_hdr->wr.rdma.remote_addr =
 719                                         rdma_wr(wr)->remote_addr;
 720                                 wqe_hdr->wr.rdma.rkey = rdma_wr(wr)->rkey;
 721                                 break;
 722                         case IB_WR_LOCAL_INV:
 723                         case IB_WR_SEND_WITH_INV:
 724                                 wqe_hdr->ex.invalidate_rkey =
 725                                         wr->ex.invalidate_rkey;
 726                                 break;
 727                         case IB_WR_ATOMIC_CMP_AND_SWP:
 728                         case IB_WR_ATOMIC_FETCH_AND_ADD:
 729                                 wqe_hdr->wr.atomic.remote_addr =
 730                                         atomic_wr(wr)->remote_addr;
 731                                 wqe_hdr->wr.atomic.rkey = atomic_wr(wr)->rkey;
 732                                 wqe_hdr->wr.atomic.compare_add =
 733                                         atomic_wr(wr)->compare_add;
 734                                 if (wr->opcode == IB_WR_ATOMIC_CMP_AND_SWP)
 735                                         wqe_hdr->wr.atomic.swap =
 736                                                 atomic_wr(wr)->swap;
 737                                 break;
 738                         case IB_WR_REG_MR:
 739                                 ret = set_reg_seg(wqe_hdr, reg_wr(wr));
 740                                 if (ret < 0) {
 741                                         dev_warn_ratelimited(&dev->pdev->dev,
 742                                                              "Failed to set fast register work request\n");
 743                                         *bad_wr = wr;
 744                                         goto out;
 745                                 }
 746                                 break;
 747                         default:
 748                                 break;
 749                         }
 750
 751                         break;
 752                 default:
 753                         dev_warn_ratelimited(&dev->pdev->dev,
 754                                              "invalid queuepair type\n");
 755                         ret = -EINVAL;
 756                         *bad_wr = wr;
 757                         goto out;
 758                 }
 759
 760                 sge = (struct pvrdma_sge *)(wqe_hdr + 1);
 761                 for (i = 0; i < wr->num_sge; i++) {
 762                         /* Need to check wqe_size 0 or max size */
 763                         sge->addr = wr->sg_list[i].addr;
 764                         sge->length = wr->sg_list[i].length;
 765                         sge->lkey = wr->sg_list[i].lkey;
 766                         sge++;
 767                 }
 768
 769                 /* Make sure wqe is written before index update */
 770                 smp_wmb();
 771
 772                 /* Update shared sq ring */
 773                 pvrdma_idx_ring_inc(&qp->sq.ring->prod_tail,
 774                                     qp->sq.wqe_cnt);
 775
 776                 wr = wr->next;
 777         }
 778
 779         ret = 0;
 780
 781 out:
 782         spin_unlock_irqrestore(&qp->sq.lock, flags);
 783
 784         if (!ret)
 785                 pvrdma_write_uar_qp(dev, PVRDMA_UAR_QP_SEND | qp->qp_handle);
 786
 787         return ret;
 788 }
 789
 790 /**
 791  * pvrdma_post_receive - post receive work request entries on a QP
 792  * @ibqp: the QP
 793  * @wr: the work request list to post
 794  * @bad_wr: the first bad WR returned
 795  *
 796  * @return: 0 on success, otherwise errno returned.
 797  */
 798 int pvrdma_post_recv(struct ib_qp *ibqp, struct ib_recv_wr *wr,
 799                      struct ib_recv_wr **bad_wr)
 800 {
 801         struct pvrdma_dev *dev = to_vdev(ibqp->device);
 802         unsigned long flags;
 803         struct pvrdma_qp *qp = to_vqp(ibqp);
 804         struct pvrdma_rq_wqe_hdr *wqe_hdr;
 805         struct pvrdma_sge *sge;
 806         int ret = 0;
 807         int i;
 808
 809         /*
 810          * In the RESET state, we can fail immediately. For other states,
 811          * just post and let the device figure it out.
 812          */
 813         if (qp->state == IB_QPS_RESET) {
 814                 *bad_wr = wr;
 815                 return -EINVAL;
 816         }
 817
 818         spin_lock_irqsave(&qp->rq.lock, flags);
 819
 820         while (wr) {
 821                 unsigned int tail = 0;
 822
 823                 if (unlikely(wr->num_sge > qp->rq.max_sg ||
 824                              wr->num_sge < 0)) {
 825                         ret = -EINVAL;
 826                         *bad_wr = wr;
 827                         dev_warn_ratelimited(&dev->pdev->dev,
 828                                              "recv SGE overflow\n");
 829                         goto out;
 830                 }
 831
 832                 if (unlikely(!pvrdma_idx_ring_has_space(
 833                                 qp->rq.ring, qp->rq.wqe_cnt, &tail))) {
 834                         ret = -ENOMEM;
 835                         *bad_wr = wr;
 836                         dev_warn_ratelimited(&dev->pdev->dev,
 837                                              "recv queue full\n");
 838                         goto out;
 839                 }
 840
 841                 wqe_hdr = (struct pvrdma_rq_wqe_hdr *)get_rq_wqe(qp, tail);
 842                 wqe_hdr->wr_id = wr->wr_id;
 843                 wqe_hdr->num_sge = wr->num_sge;
 844                 wqe_hdr->total_len = 0;
 845
 846                 sge = (struct pvrdma_sge *)(wqe_hdr + 1);
 847                 for (i = 0; i < wr->num_sge; i++) {
 848                         sge->addr = wr->sg_list[i].addr;
 849                         sge->length = wr->sg_list[i].length;
 850                         sge->lkey = wr->sg_list[i].lkey;
 851                         sge++;
 852                 }
 853
 854                 /* Make sure wqe is written before index update */
 855                 smp_wmb();
 856
 857                 /* Update shared rq ring */
 858                 pvrdma_idx_ring_inc(&qp->rq.ring->prod_tail,
 859                                     qp->rq.wqe_cnt);
 860
 861                 wr = wr->next;
 862         }
 863
 864         spin_unlock_irqrestore(&qp->rq.lock, flags);
 865
 866         pvrdma_write_uar_qp(dev, PVRDMA_UAR_QP_RECV | qp->qp_handle);
 867
 868         return ret;
 869
 870 out:
 871         spin_unlock_irqrestore(&qp->rq.lock, flags);
 872
 873         return ret;
 874 }
 875
 876 /**
 877  * pvrdma_query_qp - query a queue pair's attributes
 878  * @ibqp: the queue pair to query
 879  * @attr: the queue pair's attributes
 880  * @attr_mask: attributes mask
 881  * @init_attr: initial queue pair attributes
 882  *
 883  * @returns 0 on success, otherwise returns an errno.
 884  */
 885 int pvrdma_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
 886                     int attr_mask, struct ib_qp_init_attr *init_attr)
 887 {
 888         struct pvrdma_dev *dev = to_vdev(ibqp->device);
 889         struct pvrdma_qp *qp = to_vqp(ibqp);
 890         union pvrdma_cmd_req req;
 891         union pvrdma_cmd_resp rsp;
 892         struct pvrdma_cmd_query_qp *cmd = &req.query_qp;
 893         struct pvrdma_cmd_query_qp_resp *resp = &rsp.query_qp_resp;
 894         int ret = 0;
 895
 896         mutex_lock(&qp->mutex);
 897
 898         if (qp->state == IB_QPS_RESET) {
 899                 attr->qp_state = IB_QPS_RESET;
 900                 goto out;
 901         }
 902
 903         memset(cmd, 0, sizeof(*cmd));
 904         cmd->hdr.cmd = PVRDMA_CMD_QUERY_QP;
 905         cmd->qp_handle = qp->qp_handle;
 906         cmd->attr_mask = ib_qp_attr_mask_to_pvrdma(attr_mask);
 907
 908         ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_QUERY_QP_RESP);
 909         if (ret < 0) {
 910                 dev_warn(&dev->pdev->dev,
 911                          "could not query queuepair, error: %d\n", ret);
 912                 goto out;
 913         }
 914
 915         attr->qp_state = pvrdma_qp_state_to_ib(resp->attrs.qp_state);
 916         attr->cur_qp_state =
 917                 pvrdma_qp_state_to_ib(resp->attrs.cur_qp_state);
 918         attr->path_mtu = pvrdma_mtu_to_ib(resp->attrs.path_mtu);
 919         attr->path_mig_state =
 920                 pvrdma_mig_state_to_ib(resp->attrs.path_mig_state);
 921         attr->qkey = resp->attrs.qkey;
 922         attr->rq_psn = resp->attrs.rq_psn;
 923         attr->sq_psn = resp->attrs.sq_psn;
 924         attr->dest_qp_num = resp->attrs.dest_qp_num;
 925         attr->qp_access_flags =
 926                 pvrdma_access_flags_to_ib(resp->attrs.qp_access_flags);
 927         attr->pkey_index = resp->attrs.pkey_index;
 928         attr->alt_pkey_index = resp->attrs.alt_pkey_index;
 929         attr->en_sqd_async_notify = resp->attrs.en_sqd_async_notify;
 930         attr->sq_draining = resp->attrs.sq_draining;
 931         attr->max_rd_atomic = resp->attrs.max_rd_atomic;
 932         attr->max_dest_rd_atomic = resp->attrs.max_dest_rd_atomic;
 933         attr->min_rnr_timer = resp->attrs.min_rnr_timer;
 934         attr->port_num = resp->attrs.port_num;
 935         attr->timeout = resp->attrs.timeout;
 936         attr->retry_cnt = resp->attrs.retry_cnt;
 937         attr->rnr_retry = resp->attrs.rnr_retry;
 938         attr->alt_port_num = resp->attrs.alt_port_num;
 939         attr->alt_timeout = resp->attrs.alt_timeout;
 940         pvrdma_qp_cap_to_ib(&attr->cap, &resp->attrs.cap);
 941         pvrdma_ah_attr_to_ib(&attr->ah_attr, &resp->attrs.ah_attr);
 942         pvrdma_ah_attr_to_ib(&attr->alt_ah_attr, &resp->attrs.alt_ah_attr);
 943
 944         qp->state = attr->qp_state;
 945
 946         ret = 0;
 947
 948 out:
 949         attr->cur_qp_state = attr->qp_state;
 950
 951         init_attr->event_handler = qp->ibqp.event_handler;
 952         init_attr->qp_context = qp->ibqp.qp_context;
 953         init_attr->send_cq = qp->ibqp.send_cq;
 954         init_attr->recv_cq = qp->ibqp.recv_cq;
 955         init_attr->srq = qp->ibqp.srq;
 956         init_attr->xrcd = NULL;
 957         init_attr->cap = attr->cap;
 958         init_attr->sq_sig_type = 0;
 959         init_attr->qp_type = qp->ibqp.qp_type;
 960         init_attr->create_flags = 0;
 961         init_attr->port_num = qp->port;
 962
 963         mutex_unlock(&qp->mutex);
 964         return ret;
 965 }