drivers/infiniband/sw/rxe/rxe_verbs.c

   1 /*
   2  * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
   3  * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #include <linux/dma-mapping.h>
  35 #include <net/addrconf.h>
  36 #include <rdma/uverbs_ioctl.h>
  37 #include "rxe.h"
  38 #include "rxe_loc.h"
  39 #include "rxe_queue.h"
  40 #include "rxe_hw_counters.h"
  41
  42 static int rxe_query_device(struct ib_device *dev,
  43                             struct ib_device_attr *attr,
  44                             struct ib_udata *uhw)
  45 {
  46         struct rxe_dev *rxe = to_rdev(dev);
  47
  48         if (uhw->inlen || uhw->outlen)
  49                 return -EINVAL;
  50
  51         *attr = rxe->attr;
  52         return 0;
  53 }
  54
  55 static int rxe_query_port(struct ib_device *dev,
  56                           u8 port_num, struct ib_port_attr *attr)
  57 {
  58         struct rxe_dev *rxe = to_rdev(dev);
  59         struct rxe_port *port;
  60         int rc;
  61
  62         port = &rxe->port;
  63
  64         /* *attr being zeroed by the caller, avoid zeroing it here */
  65         *attr = port->attr;
  66
  67         mutex_lock(&rxe->usdev_lock);
  68         rc = ib_get_eth_speed(dev, port_num, &attr->active_speed,
  69                               &attr->active_width);
  70
  71         if (attr->state == IB_PORT_ACTIVE)
  72                 attr->phys_state = IB_PORT_PHYS_STATE_LINK_UP;
  73         else if (dev_get_flags(rxe->ndev) & IFF_UP)
  74                 attr->phys_state = IB_PORT_PHYS_STATE_POLLING;
  75         else
  76                 attr->phys_state = IB_PORT_PHYS_STATE_DISABLED;
  77
  78         mutex_unlock(&rxe->usdev_lock);
  79
  80         return rc;
  81 }
  82
  83 static int rxe_query_pkey(struct ib_device *device,
  84                           u8 port_num, u16 index, u16 *pkey)
  85 {
  86         struct rxe_dev *rxe = to_rdev(device);
  87         struct rxe_port *port;
  88
  89         port = &rxe->port;
  90
  91         if (unlikely(index >= port->attr.pkey_tbl_len)) {
  92                 dev_warn(device->dev.parent, "invalid index = %d\n",
  93                          index);
  94                 goto err1;
  95         }
  96
  97         *pkey = port->pkey_tbl[index];
  98         return 0;
  99
 100 err1:
 101         return -EINVAL;
 102 }
 103
 104 static int rxe_modify_device(struct ib_device *dev,
 105                              int mask, struct ib_device_modify *attr)
 106 {
 107         struct rxe_dev *rxe = to_rdev(dev);
 108
 109         if (mask & ~(IB_DEVICE_MODIFY_SYS_IMAGE_GUID |
 110                      IB_DEVICE_MODIFY_NODE_DESC))
 111                 return -EOPNOTSUPP;
 112
 113         if (mask & IB_DEVICE_MODIFY_SYS_IMAGE_GUID)
 114                 rxe->attr.sys_image_guid = cpu_to_be64(attr->sys_image_guid);
 115
 116         if (mask & IB_DEVICE_MODIFY_NODE_DESC) {
 117                 memcpy(rxe->ib_dev.node_desc,
 118                        attr->node_desc, sizeof(rxe->ib_dev.node_desc));
 119         }
 120
 121         return 0;
 122 }
 123
 124 static int rxe_modify_port(struct ib_device *dev,
 125                            u8 port_num, int mask, struct ib_port_modify *attr)
 126 {
 127         struct rxe_dev *rxe = to_rdev(dev);
 128         struct rxe_port *port;
 129
 130         port = &rxe->port;
 131
 132         port->attr.port_cap_flags |= attr->set_port_cap_mask;
 133         port->attr.port_cap_flags &= ~attr->clr_port_cap_mask;
 134
 135         if (mask & IB_PORT_RESET_QKEY_CNTR)
 136                 port->attr.qkey_viol_cntr = 0;
 137
 138         return 0;
 139 }
 140
 141 static enum rdma_link_layer rxe_get_link_layer(struct ib_device *dev,
 142                                                u8 port_num)
 143 {
 144         struct rxe_dev *rxe = to_rdev(dev);
 145
 146         return rxe_link_layer(rxe, port_num);
 147 }
 148
 149 static int rxe_alloc_ucontext(struct ib_ucontext *uctx, struct ib_udata *udata)
 150 {
 151         struct rxe_dev *rxe = to_rdev(uctx->device);
 152         struct rxe_ucontext *uc = to_ruc(uctx);
 153
 154         return rxe_add_to_pool(&rxe->uc_pool, &uc->pelem);
 155 }
 156
 157 static void rxe_dealloc_ucontext(struct ib_ucontext *ibuc)
 158 {
 159         struct rxe_ucontext *uc = to_ruc(ibuc);
 160
 161         rxe_drop_ref(uc);
 162 }
 163
 164 static int rxe_port_immutable(struct ib_device *dev, u8 port_num,
 165                               struct ib_port_immutable *immutable)
 166 {
 167         int err;
 168         struct ib_port_attr attr;
 169
 170         immutable->core_cap_flags = RDMA_CORE_PORT_IBA_ROCE_UDP_ENCAP;
 171
 172         err = ib_query_port(dev, port_num, &attr);
 173         if (err)
 174                 return err;
 175
 176         immutable->pkey_tbl_len = attr.pkey_tbl_len;
 177         immutable->gid_tbl_len = attr.gid_tbl_len;
 178         immutable->max_mad_size = IB_MGMT_MAD_SIZE;
 179
 180         return 0;
 181 }
 182
 183 static int rxe_alloc_pd(struct ib_pd *ibpd, struct ib_udata *udata)
 184 {
 185         struct rxe_dev *rxe = to_rdev(ibpd->device);
 186         struct rxe_pd *pd = to_rpd(ibpd);
 187
 188         return rxe_add_to_pool(&rxe->pd_pool, &pd->pelem);
 189 }
 190
 191 static void rxe_dealloc_pd(struct ib_pd *ibpd, struct ib_udata *udata)
 192 {
 193         struct rxe_pd *pd = to_rpd(ibpd);
 194
 195         rxe_drop_ref(pd);
 196 }
 197
 198 static int rxe_create_ah(struct ib_ah *ibah, struct rdma_ah_attr *attr,
 199                          u32 flags, struct ib_udata *udata)
 200
 201 {
 202         int err;
 203         struct rxe_dev *rxe = to_rdev(ibah->device);
 204         struct rxe_ah *ah = to_rah(ibah);
 205
 206         err = rxe_av_chk_attr(rxe, attr);
 207         if (err)
 208                 return err;
 209
 210         err = rxe_add_to_pool(&rxe->ah_pool, &ah->pelem);
 211         if (err)
 212                 return err;
 213
 214         rxe_init_av(attr, &ah->av);
 215         return 0;
 216 }
 217
 218 static int rxe_modify_ah(struct ib_ah *ibah, struct rdma_ah_attr *attr)
 219 {
 220         int err;
 221         struct rxe_dev *rxe = to_rdev(ibah->device);
 222         struct rxe_ah *ah = to_rah(ibah);
 223
 224         err = rxe_av_chk_attr(rxe, attr);
 225         if (err)
 226                 return err;
 227
 228         rxe_init_av(attr, &ah->av);
 229         return 0;
 230 }
 231
 232 static int rxe_query_ah(struct ib_ah *ibah, struct rdma_ah_attr *attr)
 233 {
 234         struct rxe_ah *ah = to_rah(ibah);
 235
 236         memset(attr, 0, sizeof(*attr));
 237         attr->type = ibah->type;
 238         rxe_av_to_attr(&ah->av, attr);
 239         return 0;
 240 }
 241
 242 static void rxe_destroy_ah(struct ib_ah *ibah, u32 flags)
 243 {
 244         struct rxe_ah *ah = to_rah(ibah);
 245
 246         rxe_drop_ref(ah);
 247 }
 248
 249 static int post_one_recv(struct rxe_rq *rq, const struct ib_recv_wr *ibwr)
 250 {
 251         int err;
 252         int i;
 253         u32 length;
 254         struct rxe_recv_wqe *recv_wqe;
 255         int num_sge = ibwr->num_sge;
 256
 257         if (unlikely(queue_full(rq->queue))) {
 258                 err = -ENOMEM;
 259                 goto err1;
 260         }
 261
 262         if (unlikely(num_sge > rq->max_sge)) {
 263                 err = -EINVAL;
 264                 goto err1;
 265         }
 266
 267         length = 0;
 268         for (i = 0; i < num_sge; i++)
 269                 length += ibwr->sg_list[i].length;
 270
 271         recv_wqe = producer_addr(rq->queue);
 272         recv_wqe->wr_id = ibwr->wr_id;
 273         recv_wqe->num_sge = num_sge;
 274
 275         memcpy(recv_wqe->dma.sge, ibwr->sg_list,
 276                num_sge * sizeof(struct ib_sge));
 277
 278         recv_wqe->dma.length            = length;
 279         recv_wqe->dma.resid             = length;
 280         recv_wqe->dma.num_sge           = num_sge;
 281         recv_wqe->dma.cur_sge           = 0;
 282         recv_wqe->dma.sge_offset        = 0;
 283
 284         /* make sure all changes to the work queue are written before we
 285          * update the producer pointer
 286          */
 287         smp_wmb();
 288
 289         advance_producer(rq->queue);
 290         return 0;
 291
 292 err1:
 293         return err;
 294 }
 295
 296 static int rxe_create_srq(struct ib_srq *ibsrq, struct ib_srq_init_attr *init,
 297                           struct ib_udata *udata)
 298 {
 299         int err;
 300         struct rxe_dev *rxe = to_rdev(ibsrq->device);
 301         struct rxe_pd *pd = to_rpd(ibsrq->pd);
 302         struct rxe_srq *srq = to_rsrq(ibsrq);
 303         struct rxe_create_srq_resp __user *uresp = NULL;
 304
 305         if (udata) {
 306                 if (udata->outlen < sizeof(*uresp))
 307                         return -EINVAL;
 308                 uresp = udata->outbuf;
 309         }
 310
 311         err = rxe_srq_chk_attr(rxe, NULL, &init->attr, IB_SRQ_INIT_MASK);
 312         if (err)
 313                 goto err1;
 314
 315         err = rxe_add_to_pool(&rxe->srq_pool, &srq->pelem);
 316         if (err)
 317                 goto err1;
 318
 319         rxe_add_ref(pd);
 320         srq->pd = pd;
 321
 322         err = rxe_srq_from_init(rxe, srq, init, udata, uresp);
 323         if (err)
 324                 goto err2;
 325
 326         return 0;
 327
 328 err2:
 329         rxe_drop_ref(pd);
 330         rxe_drop_ref(srq);
 331 err1:
 332         return err;
 333 }
 334
 335 static int rxe_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 336                           enum ib_srq_attr_mask mask,
 337                           struct ib_udata *udata)
 338 {
 339         int err;
 340         struct rxe_srq *srq = to_rsrq(ibsrq);
 341         struct rxe_dev *rxe = to_rdev(ibsrq->device);
 342         struct rxe_modify_srq_cmd ucmd = {};
 343
 344         if (udata) {
 345                 if (udata->inlen < sizeof(ucmd))
 346                         return -EINVAL;
 347
 348                 err = ib_copy_from_udata(&ucmd, udata, sizeof(ucmd));
 349                 if (err)
 350                         return err;
 351         }
 352
 353         err = rxe_srq_chk_attr(rxe, srq, attr, mask);
 354         if (err)
 355                 goto err1;
 356
 357         err = rxe_srq_from_attr(rxe, srq, attr, mask, &ucmd, udata);
 358         if (err)
 359                 goto err1;
 360
 361         return 0;
 362
 363 err1:
 364         return err;
 365 }
 366
 367 static int rxe_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr)
 368 {
 369         struct rxe_srq *srq = to_rsrq(ibsrq);
 370
 371         if (srq->error)
 372                 return -EINVAL;
 373
 374         attr->max_wr = srq->rq.queue->buf->index_mask;
 375         attr->max_sge = srq->rq.max_sge;
 376         attr->srq_limit = srq->limit;
 377         return 0;
 378 }
 379
 380 static void rxe_destroy_srq(struct ib_srq *ibsrq, struct ib_udata *udata)
 381 {
 382         struct rxe_srq *srq = to_rsrq(ibsrq);
 383
 384         if (srq->rq.queue)
 385                 rxe_queue_cleanup(srq->rq.queue);
 386
 387         rxe_drop_ref(srq->pd);
 388         rxe_drop_ref(srq);
 389 }
 390
 391 static int rxe_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr,
 392                              const struct ib_recv_wr **bad_wr)
 393 {
 394         int err = 0;
 395         unsigned long flags;
 396         struct rxe_srq *srq = to_rsrq(ibsrq);
 397
 398         spin_lock_irqsave(&srq->rq.producer_lock, flags);
 399
 400         while (wr) {
 401                 err = post_one_recv(&srq->rq, wr);
 402                 if (unlikely(err))
 403                         break;
 404                 wr = wr->next;
 405         }
 406
 407         spin_unlock_irqrestore(&srq->rq.producer_lock, flags);
 408
 409         if (err)
 410                 *bad_wr = wr;
 411
 412         return err;
 413 }
 414
 415 static struct ib_qp *rxe_create_qp(struct ib_pd *ibpd,
 416                                    struct ib_qp_init_attr *init,
 417                                    struct ib_udata *udata)
 418 {
 419         int err;
 420         struct rxe_dev *rxe = to_rdev(ibpd->device);
 421         struct rxe_pd *pd = to_rpd(ibpd);
 422         struct rxe_qp *qp;
 423         struct rxe_create_qp_resp __user *uresp = NULL;
 424
 425         if (udata) {
 426                 if (udata->outlen < sizeof(*uresp))
 427                         return ERR_PTR(-EINVAL);
 428                 uresp = udata->outbuf;
 429         }
 430
 431         err = rxe_qp_chk_init(rxe, init);
 432         if (err)
 433                 goto err1;
 434
 435         qp = rxe_alloc(&rxe->qp_pool);
 436         if (!qp) {
 437                 err = -ENOMEM;
 438                 goto err1;
 439         }
 440
 441         if (udata) {
 442                 if (udata->inlen) {
 443                         err = -EINVAL;
 444                         goto err2;
 445                 }
 446                 qp->is_user = 1;
 447         }
 448
 449         rxe_add_index(qp);
 450
 451         err = rxe_qp_from_init(rxe, qp, pd, init, uresp, ibpd, udata);
 452         if (err)
 453                 goto err3;
 454
 455         return &qp->ibqp;
 456
 457 err3:
 458         rxe_drop_index(qp);
 459 err2:
 460         rxe_drop_ref(qp);
 461 err1:
 462         return ERR_PTR(err);
 463 }
 464
 465 static int rxe_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
 466                          int mask, struct ib_udata *udata)
 467 {
 468         int err;
 469         struct rxe_dev *rxe = to_rdev(ibqp->device);
 470         struct rxe_qp *qp = to_rqp(ibqp);
 471
 472         err = rxe_qp_chk_attr(rxe, qp, attr, mask);
 473         if (err)
 474                 goto err1;
 475
 476         err = rxe_qp_from_attr(qp, attr, mask, udata);
 477         if (err)
 478                 goto err1;
 479
 480         return 0;
 481
 482 err1:
 483         return err;
 484 }
 485
 486 static int rxe_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
 487                         int mask, struct ib_qp_init_attr *init)
 488 {
 489         struct rxe_qp *qp = to_rqp(ibqp);
 490
 491         rxe_qp_to_init(qp, init);
 492         rxe_qp_to_attr(qp, attr, mask);
 493
 494         return 0;
 495 }
 496
 497 static int rxe_destroy_qp(struct ib_qp *ibqp, struct ib_udata *udata)
 498 {
 499         struct rxe_qp *qp = to_rqp(ibqp);
 500
 501         rxe_qp_destroy(qp);
 502         rxe_drop_index(qp);
 503         rxe_drop_ref(qp);
 504         return 0;
 505 }
 506
 507 static int validate_send_wr(struct rxe_qp *qp, const struct ib_send_wr *ibwr,
 508                             unsigned int mask, unsigned int length)
 509 {
 510         int num_sge = ibwr->num_sge;
 511         struct rxe_sq *sq = &qp->sq;
 512
 513         if (unlikely(num_sge > sq->max_sge))
 514                 goto err1;
 515
 516         if (unlikely(mask & WR_ATOMIC_MASK)) {
 517                 if (length < 8)
 518                         goto err1;
 519
 520                 if (atomic_wr(ibwr)->remote_addr & 0x7)
 521                         goto err1;
 522         }
 523
 524         if (unlikely((ibwr->send_flags & IB_SEND_INLINE) &&
 525                      (length > sq->max_inline)))
 526                 goto err1;
 527
 528         return 0;
 529
 530 err1:
 531         return -EINVAL;
 532 }
 533
 534 static void init_send_wr(struct rxe_qp *qp, struct rxe_send_wr *wr,
 535                          const struct ib_send_wr *ibwr)
 536 {
 537         wr->wr_id = ibwr->wr_id;
 538         wr->num_sge = ibwr->num_sge;
 539         wr->opcode = ibwr->opcode;
 540         wr->send_flags = ibwr->send_flags;
 541
 542         if (qp_type(qp) == IB_QPT_UD ||
 543             qp_type(qp) == IB_QPT_SMI ||
 544             qp_type(qp) == IB_QPT_GSI) {
 545                 wr->wr.ud.remote_qpn = ud_wr(ibwr)->remote_qpn;
 546                 wr->wr.ud.remote_qkey = ud_wr(ibwr)->remote_qkey;
 547                 if (qp_type(qp) == IB_QPT_GSI)
 548                         wr->wr.ud.pkey_index = ud_wr(ibwr)->pkey_index;
 549                 if (wr->opcode == IB_WR_SEND_WITH_IMM)
 550                         wr->ex.imm_data = ibwr->ex.imm_data;
 551         } else {
 552                 switch (wr->opcode) {
 553                 case IB_WR_RDMA_WRITE_WITH_IMM:
 554                         wr->ex.imm_data = ibwr->ex.imm_data;
 555                         /* fall through */
 556                 case IB_WR_RDMA_READ:
 557                 case IB_WR_RDMA_WRITE:
 558                         wr->wr.rdma.remote_addr = rdma_wr(ibwr)->remote_addr;
 559                         wr->wr.rdma.rkey        = rdma_wr(ibwr)->rkey;
 560                         break;
 561                 case IB_WR_SEND_WITH_IMM:
 562                         wr->ex.imm_data = ibwr->ex.imm_data;
 563                         break;
 564                 case IB_WR_SEND_WITH_INV:
 565                         wr->ex.invalidate_rkey = ibwr->ex.invalidate_rkey;
 566                         break;
 567                 case IB_WR_ATOMIC_CMP_AND_SWP:
 568                 case IB_WR_ATOMIC_FETCH_AND_ADD:
 569                         wr->wr.atomic.remote_addr =
 570                                 atomic_wr(ibwr)->remote_addr;
 571                         wr->wr.atomic.compare_add =
 572                                 atomic_wr(ibwr)->compare_add;
 573                         wr->wr.atomic.swap = atomic_wr(ibwr)->swap;
 574                         wr->wr.atomic.rkey = atomic_wr(ibwr)->rkey;
 575                         break;
 576                 case IB_WR_LOCAL_INV:
 577                         wr->ex.invalidate_rkey = ibwr->ex.invalidate_rkey;
 578                 break;
 579                 case IB_WR_REG_MR:
 580                         wr->wr.reg.mr = reg_wr(ibwr)->mr;
 581                         wr->wr.reg.key = reg_wr(ibwr)->key;
 582                         wr->wr.reg.access = reg_wr(ibwr)->access;
 583                 break;
 584                 default:
 585                         break;
 586                 }
 587         }
 588 }
 589
 590 static int init_send_wqe(struct rxe_qp *qp, const struct ib_send_wr *ibwr,
 591                          unsigned int mask, unsigned int length,
 592                          struct rxe_send_wqe *wqe)
 593 {
 594         int num_sge = ibwr->num_sge;
 595         struct ib_sge *sge;
 596         int i;
 597         u8 *p;
 598
 599         init_send_wr(qp, &wqe->wr, ibwr);
 600
 601         if (qp_type(qp) == IB_QPT_UD ||
 602             qp_type(qp) == IB_QPT_SMI ||
 603             qp_type(qp) == IB_QPT_GSI)
 604                 memcpy(&wqe->av, &to_rah(ud_wr(ibwr)->ah)->av, sizeof(wqe->av));
 605
 606         if (unlikely(ibwr->send_flags & IB_SEND_INLINE)) {
 607                 p = wqe->dma.inline_data;
 608
 609                 sge = ibwr->sg_list;
 610                 for (i = 0; i < num_sge; i++, sge++) {
 611                         memcpy(p, (void *)(uintptr_t)sge->addr,
 612                                         sge->length);
 613
 614                         p += sge->length;
 615                 }
 616         } else if (mask & WR_REG_MASK) {
 617                 wqe->mask = mask;
 618                 wqe->state = wqe_state_posted;
 619                 return 0;
 620         } else
 621                 memcpy(wqe->dma.sge, ibwr->sg_list,
 622                        num_sge * sizeof(struct ib_sge));
 623
 624         wqe->iova = mask & WR_ATOMIC_MASK ? atomic_wr(ibwr)->remote_addr :
 625                 mask & WR_READ_OR_WRITE_MASK ? rdma_wr(ibwr)->remote_addr : 0;
 626         wqe->mask               = mask;
 627         wqe->dma.length         = length;
 628         wqe->dma.resid          = length;
 629         wqe->dma.num_sge        = num_sge;
 630         wqe->dma.cur_sge        = 0;
 631         wqe->dma.sge_offset     = 0;
 632         wqe->state              = wqe_state_posted;
 633         wqe->ssn                = atomic_add_return(1, &qp->ssn);
 634
 635         return 0;
 636 }
 637
 638 static int post_one_send(struct rxe_qp *qp, const struct ib_send_wr *ibwr,
 639                          unsigned int mask, u32 length)
 640 {
 641         int err;
 642         struct rxe_sq *sq = &qp->sq;
 643         struct rxe_send_wqe *send_wqe;
 644         unsigned long flags;
 645
 646         err = validate_send_wr(qp, ibwr, mask, length);
 647         if (err)
 648                 return err;
 649
 650         spin_lock_irqsave(&qp->sq.sq_lock, flags);
 651
 652         if (unlikely(queue_full(sq->queue))) {
 653                 err = -ENOMEM;
 654                 goto err1;
 655         }
 656
 657         send_wqe = producer_addr(sq->queue);
 658
 659         err = init_send_wqe(qp, ibwr, mask, length, send_wqe);
 660         if (unlikely(err))
 661                 goto err1;
 662
 663         /*
 664          * make sure all changes to the work queue are
 665          * written before we update the producer pointer
 666          */
 667         smp_wmb();
 668
 669         advance_producer(sq->queue);
 670         spin_unlock_irqrestore(&qp->sq.sq_lock, flags);
 671
 672         return 0;
 673
 674 err1:
 675         spin_unlock_irqrestore(&qp->sq.sq_lock, flags);
 676         return err;
 677 }
 678
 679 static int rxe_post_send_kernel(struct rxe_qp *qp, const struct ib_send_wr *wr,
 680                                 const struct ib_send_wr **bad_wr)
 681 {
 682         int err = 0;
 683         unsigned int mask;
 684         unsigned int length = 0;
 685         int i;
 686
 687         while (wr) {
 688                 mask = wr_opcode_mask(wr->opcode, qp);
 689                 if (unlikely(!mask)) {
 690                         err = -EINVAL;
 691                         *bad_wr = wr;
 692                         break;
 693                 }
 694
 695                 if (unlikely((wr->send_flags & IB_SEND_INLINE) &&
 696                              !(mask & WR_INLINE_MASK))) {
 697                         err = -EINVAL;
 698                         *bad_wr = wr;
 699                         break;
 700                 }
 701
 702                 length = 0;
 703                 for (i = 0; i < wr->num_sge; i++)
 704                         length += wr->sg_list[i].length;
 705
 706                 err = post_one_send(qp, wr, mask, length);
 707
 708                 if (err) {
 709                         *bad_wr = wr;
 710                         break;
 711                 }
 712                 wr = wr->next;
 713         }
 714
 715         rxe_run_task(&qp->req.task, 1);
 716         if (unlikely(qp->req.state == QP_STATE_ERROR))
 717                 rxe_run_task(&qp->comp.task, 1);
 718
 719         return err;
 720 }
 721
 722 static int rxe_post_send(struct ib_qp *ibqp, const struct ib_send_wr *wr,
 723                          const struct ib_send_wr **bad_wr)
 724 {
 725         struct rxe_qp *qp = to_rqp(ibqp);
 726
 727         if (unlikely(!qp->valid)) {
 728                 *bad_wr = wr;
 729                 return -EINVAL;
 730         }
 731
 732         if (unlikely(qp->req.state < QP_STATE_READY)) {
 733                 *bad_wr = wr;
 734                 return -EINVAL;
 735         }
 736
 737         if (qp->is_user) {
 738                 /* Utilize process context to do protocol processing */
 739                 rxe_run_task(&qp->req.task, 0);
 740                 return 0;
 741         } else
 742                 return rxe_post_send_kernel(qp, wr, bad_wr);
 743 }
 744
 745 static int rxe_post_recv(struct ib_qp *ibqp, const struct ib_recv_wr *wr,
 746                          const struct ib_recv_wr **bad_wr)
 747 {
 748         int err = 0;
 749         struct rxe_qp *qp = to_rqp(ibqp);
 750         struct rxe_rq *rq = &qp->rq;
 751         unsigned long flags;
 752
 753         if (unlikely((qp_state(qp) < IB_QPS_INIT) || !qp->valid)) {
 754                 *bad_wr = wr;
 755                 err = -EINVAL;
 756                 goto err1;
 757         }
 758
 759         if (unlikely(qp->srq)) {
 760                 *bad_wr = wr;
 761                 err = -EINVAL;
 762                 goto err1;
 763         }
 764
 765         spin_lock_irqsave(&rq->producer_lock, flags);
 766
 767         while (wr) {
 768                 err = post_one_recv(rq, wr);
 769                 if (unlikely(err)) {
 770                         *bad_wr = wr;
 771                         break;
 772                 }
 773                 wr = wr->next;
 774         }
 775
 776         spin_unlock_irqrestore(&rq->producer_lock, flags);
 777
 778         if (qp->resp.state == QP_STATE_ERROR)
 779                 rxe_run_task(&qp->resp.task, 1);
 780
 781 err1:
 782         return err;
 783 }
 784
 785 static int rxe_create_cq(struct ib_cq *ibcq, const struct ib_cq_init_attr *attr,
 786                          struct ib_udata *udata)
 787 {
 788         int err;
 789         struct ib_device *dev = ibcq->device;
 790         struct rxe_dev *rxe = to_rdev(dev);
 791         struct rxe_cq *cq = to_rcq(ibcq);
 792         struct rxe_create_cq_resp __user *uresp = NULL;
 793
 794         if (udata) {
 795                 if (udata->outlen < sizeof(*uresp))
 796                         return -EINVAL;
 797                 uresp = udata->outbuf;
 798         }
 799
 800         if (attr->flags)
 801                 return -EINVAL;
 802
 803         err = rxe_cq_chk_attr(rxe, NULL, attr->cqe, attr->comp_vector);
 804         if (err)
 805                 return err;
 806
 807         err = rxe_cq_from_init(rxe, cq, attr->cqe, attr->comp_vector, udata,
 808                                uresp);
 809         if (err)
 810                 return err;
 811
 812         return rxe_add_to_pool(&rxe->cq_pool, &cq->pelem);
 813 }
 814
 815 static void rxe_destroy_cq(struct ib_cq *ibcq, struct ib_udata *udata)
 816 {
 817         struct rxe_cq *cq = to_rcq(ibcq);
 818
 819         rxe_cq_disable(cq);
 820
 821         rxe_drop_ref(cq);
 822 }
 823
 824 static int rxe_resize_cq(struct ib_cq *ibcq, int cqe, struct ib_udata *udata)
 825 {
 826         int err;
 827         struct rxe_cq *cq = to_rcq(ibcq);
 828         struct rxe_dev *rxe = to_rdev(ibcq->device);
 829         struct rxe_resize_cq_resp __user *uresp = NULL;
 830
 831         if (udata) {
 832                 if (udata->outlen < sizeof(*uresp))
 833                         return -EINVAL;
 834                 uresp = udata->outbuf;
 835         }
 836
 837         err = rxe_cq_chk_attr(rxe, cq, cqe, 0);
 838         if (err)
 839                 goto err1;
 840
 841         err = rxe_cq_resize_queue(cq, cqe, uresp, udata);
 842         if (err)
 843                 goto err1;
 844
 845         return 0;
 846
 847 err1:
 848         return err;
 849 }
 850
 851 static int rxe_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc)
 852 {
 853         int i;
 854         struct rxe_cq *cq = to_rcq(ibcq);
 855         struct rxe_cqe *cqe;
 856         unsigned long flags;
 857
 858         spin_lock_irqsave(&cq->cq_lock, flags);
 859         for (i = 0; i < num_entries; i++) {
 860                 cqe = queue_head(cq->queue);
 861                 if (!cqe)
 862                         break;
 863
 864                 memcpy(wc++, &cqe->ibwc, sizeof(*wc));
 865                 advance_consumer(cq->queue);
 866         }
 867         spin_unlock_irqrestore(&cq->cq_lock, flags);
 868
 869         return i;
 870 }
 871
 872 static int rxe_peek_cq(struct ib_cq *ibcq, int wc_cnt)
 873 {
 874         struct rxe_cq *cq = to_rcq(ibcq);
 875         int count = queue_count(cq->queue);
 876
 877         return (count > wc_cnt) ? wc_cnt : count;
 878 }
 879
 880 static int rxe_req_notify_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags)
 881 {
 882         struct rxe_cq *cq = to_rcq(ibcq);
 883         unsigned long irq_flags;
 884         int ret = 0;
 885
 886         spin_lock_irqsave(&cq->cq_lock, irq_flags);
 887         if (cq->notify != IB_CQ_NEXT_COMP)
 888                 cq->notify = flags & IB_CQ_SOLICITED_MASK;
 889
 890         if ((flags & IB_CQ_REPORT_MISSED_EVENTS) && !queue_empty(cq->queue))
 891                 ret = 1;
 892
 893         spin_unlock_irqrestore(&cq->cq_lock, irq_flags);
 894
 895         return ret;
 896 }
 897
 898 static struct ib_mr *rxe_get_dma_mr(struct ib_pd *ibpd, int access)
 899 {
 900         struct rxe_dev *rxe = to_rdev(ibpd->device);
 901         struct rxe_pd *pd = to_rpd(ibpd);
 902         struct rxe_mem *mr;
 903         int err;
 904
 905         mr = rxe_alloc(&rxe->mr_pool);
 906         if (!mr) {
 907                 err = -ENOMEM;
 908                 goto err1;
 909         }
 910
 911         rxe_add_index(mr);
 912
 913         rxe_add_ref(pd);
 914
 915         err = rxe_mem_init_dma(pd, access, mr);
 916         if (err)
 917                 goto err2;
 918
 919         return &mr->ibmr;
 920
 921 err2:
 922         rxe_drop_ref(pd);
 923         rxe_drop_index(mr);
 924         rxe_drop_ref(mr);
 925 err1:
 926         return ERR_PTR(err);
 927 }
 928
 929 static struct ib_mr *rxe_reg_user_mr(struct ib_pd *ibpd,
 930                                      u64 start,
 931                                      u64 length,
 932                                      u64 iova,
 933                                      int access, struct ib_udata *udata)
 934 {
 935         int err;
 936         struct rxe_dev *rxe = to_rdev(ibpd->device);
 937         struct rxe_pd *pd = to_rpd(ibpd);
 938         struct rxe_mem *mr;
 939
 940         mr = rxe_alloc(&rxe->mr_pool);
 941         if (!mr) {
 942                 err = -ENOMEM;
 943                 goto err2;
 944         }
 945
 946         rxe_add_index(mr);
 947
 948         rxe_add_ref(pd);
 949
 950         err = rxe_mem_init_user(pd, start, length, iova,
 951                                 access, udata, mr);
 952         if (err)
 953                 goto err3;
 954
 955         return &mr->ibmr;
 956
 957 err3:
 958         rxe_drop_ref(pd);
 959         rxe_drop_index(mr);
 960         rxe_drop_ref(mr);
 961 err2:
 962         return ERR_PTR(err);
 963 }
 964
 965 static int rxe_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata)
 966 {
 967         struct rxe_mem *mr = to_rmr(ibmr);
 968
 969         mr->state = RXE_MEM_STATE_ZOMBIE;
 970         rxe_drop_ref(mr->pd);
 971         rxe_drop_index(mr);
 972         rxe_drop_ref(mr);
 973         return 0;
 974 }
 975
 976 static struct ib_mr *rxe_alloc_mr(struct ib_pd *ibpd, enum ib_mr_type mr_type,
 977                                   u32 max_num_sg, struct ib_udata *udata)
 978 {
 979         struct rxe_dev *rxe = to_rdev(ibpd->device);
 980         struct rxe_pd *pd = to_rpd(ibpd);
 981         struct rxe_mem *mr;
 982         int err;
 983
 984         if (mr_type != IB_MR_TYPE_MEM_REG)
 985                 return ERR_PTR(-EINVAL);
 986
 987         mr = rxe_alloc(&rxe->mr_pool);
 988         if (!mr) {
 989                 err = -ENOMEM;
 990                 goto err1;
 991         }
 992
 993         rxe_add_index(mr);
 994
 995         rxe_add_ref(pd);
 996
 997         err = rxe_mem_init_fast(pd, max_num_sg, mr);
 998         if (err)
 999                 goto err2;
1000
1001         return &mr->ibmr;
1002
1003 err2:
1004         rxe_drop_ref(pd);
1005         rxe_drop_index(mr);
1006         rxe_drop_ref(mr);
1007 err1:
1008         return ERR_PTR(err);
1009 }
1010
1011 static int rxe_set_page(struct ib_mr *ibmr, u64 addr)
1012 {
1013         struct rxe_mem *mr = to_rmr(ibmr);
1014         struct rxe_map *map;
1015         struct rxe_phys_buf *buf;
1016
1017         if (unlikely(mr->nbuf == mr->num_buf))
1018                 return -ENOMEM;
1019
1020         map = mr->map[mr->nbuf / RXE_BUF_PER_MAP];
1021         buf = &map->buf[mr->nbuf % RXE_BUF_PER_MAP];
1022
1023         buf->addr = addr;
1024         buf->size = ibmr->page_size;
1025         mr->nbuf++;
1026
1027         return 0;
1028 }
1029
1030 static int rxe_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg,
1031                          int sg_nents, unsigned int *sg_offset)
1032 {
1033         struct rxe_mem *mr = to_rmr(ibmr);
1034         int n;
1035
1036         mr->nbuf = 0;
1037
1038         n = ib_sg_to_pages(ibmr, sg, sg_nents, sg_offset, rxe_set_page);
1039
1040         mr->va = ibmr->iova;
1041         mr->iova = ibmr->iova;
1042         mr->length = ibmr->length;
1043         mr->page_shift = ilog2(ibmr->page_size);
1044         mr->page_mask = ibmr->page_size - 1;
1045         mr->offset = mr->iova & mr->page_mask;
1046
1047         return n;
1048 }
1049
1050 static int rxe_attach_mcast(struct ib_qp *ibqp, union ib_gid *mgid, u16 mlid)
1051 {
1052         int err;
1053         struct rxe_dev *rxe = to_rdev(ibqp->device);
1054         struct rxe_qp *qp = to_rqp(ibqp);
1055         struct rxe_mc_grp *grp;
1056
1057         /* takes a ref on grp if successful */
1058         err = rxe_mcast_get_grp(rxe, mgid, &grp);
1059         if (err)
1060                 return err;
1061
1062         err = rxe_mcast_add_grp_elem(rxe, qp, grp);
1063
1064         rxe_drop_ref(grp);
1065         return err;
1066 }
1067
1068 static int rxe_detach_mcast(struct ib_qp *ibqp, union ib_gid *mgid, u16 mlid)
1069 {
1070         struct rxe_dev *rxe = to_rdev(ibqp->device);
1071         struct rxe_qp *qp = to_rqp(ibqp);
1072
1073         return rxe_mcast_drop_grp_elem(rxe, qp, mgid);
1074 }
1075
1076 static ssize_t parent_show(struct device *device,
1077                            struct device_attribute *attr, char *buf)
1078 {
1079         struct rxe_dev *rxe =
1080                 rdma_device_to_drv_device(device, struct rxe_dev, ib_dev);
1081
1082         return snprintf(buf, 16, "%s\n", rxe_parent_name(rxe, 1));
1083 }
1084
1085 static DEVICE_ATTR_RO(parent);
1086
1087 static struct attribute *rxe_dev_attributes[] = {
1088         &dev_attr_parent.attr,
1089         NULL
1090 };
1091
1092 static const struct attribute_group rxe_attr_group = {
1093         .attrs = rxe_dev_attributes,
1094 };
1095
1096 static int rxe_enable_driver(struct ib_device *ib_dev)
1097 {
1098         struct rxe_dev *rxe = container_of(ib_dev, struct rxe_dev, ib_dev);
1099
1100         rxe_set_port_state(rxe);
1101         dev_info(&rxe->ib_dev.dev, "added %s\n", netdev_name(rxe->ndev));
1102         return 0;
1103 }
1104
1105 static const struct ib_device_ops rxe_dev_ops = {
1106         .owner = THIS_MODULE,
1107         .driver_id = RDMA_DRIVER_RXE,
1108         .uverbs_abi_ver = RXE_UVERBS_ABI_VERSION,
1109
1110         .alloc_hw_stats = rxe_ib_alloc_hw_stats,
1111         .alloc_mr = rxe_alloc_mr,
1112         .alloc_pd = rxe_alloc_pd,
1113         .alloc_ucontext = rxe_alloc_ucontext,
1114         .attach_mcast = rxe_attach_mcast,
1115         .create_ah = rxe_create_ah,
1116         .create_cq = rxe_create_cq,
1117         .create_qp = rxe_create_qp,
1118         .create_srq = rxe_create_srq,
1119         .dealloc_driver = rxe_dealloc,
1120         .dealloc_pd = rxe_dealloc_pd,
1121         .dealloc_ucontext = rxe_dealloc_ucontext,
1122         .dereg_mr = rxe_dereg_mr,
1123         .destroy_ah = rxe_destroy_ah,
1124         .destroy_cq = rxe_destroy_cq,
1125         .destroy_qp = rxe_destroy_qp,
1126         .destroy_srq = rxe_destroy_srq,
1127         .detach_mcast = rxe_detach_mcast,
1128         .enable_driver = rxe_enable_driver,
1129         .get_dma_mr = rxe_get_dma_mr,
1130         .get_hw_stats = rxe_ib_get_hw_stats,
1131         .get_link_layer = rxe_get_link_layer,
1132         .get_port_immutable = rxe_port_immutable,
1133         .map_mr_sg = rxe_map_mr_sg,
1134         .mmap = rxe_mmap,
1135         .modify_ah = rxe_modify_ah,
1136         .modify_device = rxe_modify_device,
1137         .modify_port = rxe_modify_port,
1138         .modify_qp = rxe_modify_qp,
1139         .modify_srq = rxe_modify_srq,
1140         .peek_cq = rxe_peek_cq,
1141         .poll_cq = rxe_poll_cq,
1142         .post_recv = rxe_post_recv,
1143         .post_send = rxe_post_send,
1144         .post_srq_recv = rxe_post_srq_recv,
1145         .query_ah = rxe_query_ah,
1146         .query_device = rxe_query_device,
1147         .query_pkey = rxe_query_pkey,
1148         .query_port = rxe_query_port,
1149         .query_qp = rxe_query_qp,
1150         .query_srq = rxe_query_srq,
1151         .reg_user_mr = rxe_reg_user_mr,
1152         .req_notify_cq = rxe_req_notify_cq,
1153         .resize_cq = rxe_resize_cq,
1154
1155         INIT_RDMA_OBJ_SIZE(ib_ah, rxe_ah, ibah),
1156         INIT_RDMA_OBJ_SIZE(ib_cq, rxe_cq, ibcq),
1157         INIT_RDMA_OBJ_SIZE(ib_pd, rxe_pd, ibpd),
1158         INIT_RDMA_OBJ_SIZE(ib_srq, rxe_srq, ibsrq),
1159         INIT_RDMA_OBJ_SIZE(ib_ucontext, rxe_ucontext, ibuc),
1160 };
1161
1162 int rxe_register_device(struct rxe_dev *rxe, const char *ibdev_name)
1163 {
1164         int err;
1165         struct ib_device *dev = &rxe->ib_dev;
1166         struct crypto_shash *tfm;
1167
1168         strlcpy(dev->node_desc, "rxe", sizeof(dev->node_desc));
1169
1170         dev->node_type = RDMA_NODE_IB_CA;
1171         dev->phys_port_cnt = 1;
1172         dev->num_comp_vectors = num_possible_cpus();
1173         dev->dev.parent = rxe_dma_device(rxe);
1174         dev->local_dma_lkey = 0;
1175         addrconf_addr_eui48((unsigned char *)&dev->node_guid,
1176                             rxe->ndev->dev_addr);
1177         dev->dev.dma_ops = &dma_virt_ops;
1178         dev->dev.dma_parms = &rxe->dma_parms;
1179         rxe->dma_parms = (struct device_dma_parameters)
1180                 { .max_segment_size = SZ_2G };
1181         dma_coerce_mask_and_coherent(&dev->dev,
1182                                      dma_get_required_mask(&dev->dev));
1183
1184         dev->uverbs_cmd_mask = BIT_ULL(IB_USER_VERBS_CMD_GET_CONTEXT)
1185             | BIT_ULL(IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL)
1186             | BIT_ULL(IB_USER_VERBS_CMD_QUERY_DEVICE)
1187             | BIT_ULL(IB_USER_VERBS_CMD_QUERY_PORT)
1188             | BIT_ULL(IB_USER_VERBS_CMD_ALLOC_PD)
1189             | BIT_ULL(IB_USER_VERBS_CMD_DEALLOC_PD)
1190             | BIT_ULL(IB_USER_VERBS_CMD_CREATE_SRQ)
1191             | BIT_ULL(IB_USER_VERBS_CMD_MODIFY_SRQ)
1192             | BIT_ULL(IB_USER_VERBS_CMD_QUERY_SRQ)
1193             | BIT_ULL(IB_USER_VERBS_CMD_DESTROY_SRQ)
1194             | BIT_ULL(IB_USER_VERBS_CMD_POST_SRQ_RECV)
1195             | BIT_ULL(IB_USER_VERBS_CMD_CREATE_QP)
1196             | BIT_ULL(IB_USER_VERBS_CMD_MODIFY_QP)
1197             | BIT_ULL(IB_USER_VERBS_CMD_QUERY_QP)
1198             | BIT_ULL(IB_USER_VERBS_CMD_DESTROY_QP)
1199             | BIT_ULL(IB_USER_VERBS_CMD_POST_SEND)
1200             | BIT_ULL(IB_USER_VERBS_CMD_POST_RECV)
1201             | BIT_ULL(IB_USER_VERBS_CMD_CREATE_CQ)
1202             | BIT_ULL(IB_USER_VERBS_CMD_RESIZE_CQ)
1203             | BIT_ULL(IB_USER_VERBS_CMD_DESTROY_CQ)
1204             | BIT_ULL(IB_USER_VERBS_CMD_POLL_CQ)
1205             | BIT_ULL(IB_USER_VERBS_CMD_PEEK_CQ)
1206             | BIT_ULL(IB_USER_VERBS_CMD_REQ_NOTIFY_CQ)
1207             | BIT_ULL(IB_USER_VERBS_CMD_REG_MR)
1208             | BIT_ULL(IB_USER_VERBS_CMD_DEREG_MR)
1209             | BIT_ULL(IB_USER_VERBS_CMD_CREATE_AH)
1210             | BIT_ULL(IB_USER_VERBS_CMD_MODIFY_AH)
1211             | BIT_ULL(IB_USER_VERBS_CMD_QUERY_AH)
1212             | BIT_ULL(IB_USER_VERBS_CMD_DESTROY_AH)
1213             | BIT_ULL(IB_USER_VERBS_CMD_ATTACH_MCAST)
1214             | BIT_ULL(IB_USER_VERBS_CMD_DETACH_MCAST)
1215             ;
1216
1217         ib_set_device_ops(dev, &rxe_dev_ops);
1218         err = ib_device_set_netdev(&rxe->ib_dev, rxe->ndev, 1);
1219         if (err)
1220                 return err;
1221
1222         tfm = crypto_alloc_shash("crc32", 0, 0);
1223         if (IS_ERR(tfm)) {
1224                 pr_err("failed to allocate crc algorithm err:%ld\n",
1225                        PTR_ERR(tfm));
1226                 return PTR_ERR(tfm);
1227         }
1228         rxe->tfm = tfm;
1229
1230         rdma_set_device_sysfs_group(dev, &rxe_attr_group);
1231         err = ib_register_device(dev, ibdev_name);
1232         if (err)
1233                 pr_warn("%s failed with error %d\n", __func__, err);
1234
1235         /*
1236          * Note that rxe may be invalid at this point if another thread
1237          * unregistered it.
1238          */
1239         return err;
1240 }