drivers/infiniband/sw/rxe/rxe_resp.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/skbuff.h>
  35
  36 #include "rxe.h"
  37 #include "rxe_loc.h"
  38 #include "rxe_queue.h"
  39
  40 enum resp_states {
  41         RESPST_NONE,
  42         RESPST_GET_REQ,
  43         RESPST_CHK_PSN,
  44         RESPST_CHK_OP_SEQ,
  45         RESPST_CHK_OP_VALID,
  46         RESPST_CHK_RESOURCE,
  47         RESPST_CHK_LENGTH,
  48         RESPST_CHK_RKEY,
  49         RESPST_EXECUTE,
  50         RESPST_READ_REPLY,
  51         RESPST_COMPLETE,
  52         RESPST_ACKNOWLEDGE,
  53         RESPST_CLEANUP,
  54         RESPST_DUPLICATE_REQUEST,
  55         RESPST_ERR_MALFORMED_WQE,
  56         RESPST_ERR_UNSUPPORTED_OPCODE,
  57         RESPST_ERR_MISALIGNED_ATOMIC,
  58         RESPST_ERR_PSN_OUT_OF_SEQ,
  59         RESPST_ERR_MISSING_OPCODE_FIRST,
  60         RESPST_ERR_MISSING_OPCODE_LAST_C,
  61         RESPST_ERR_MISSING_OPCODE_LAST_D1E,
  62         RESPST_ERR_TOO_MANY_RDMA_ATM_REQ,
  63         RESPST_ERR_RNR,
  64         RESPST_ERR_RKEY_VIOLATION,
  65         RESPST_ERR_LENGTH,
  66         RESPST_ERR_CQ_OVERFLOW,
  67         RESPST_ERROR,
  68         RESPST_RESET,
  69         RESPST_DONE,
  70         RESPST_EXIT,
  71 };
  72
  73 static char *resp_state_name[] = {
  74         [RESPST_NONE]                           = "NONE",
  75         [RESPST_GET_REQ]                        = "GET_REQ",
  76         [RESPST_CHK_PSN]                        = "CHK_PSN",
  77         [RESPST_CHK_OP_SEQ]                     = "CHK_OP_SEQ",
  78         [RESPST_CHK_OP_VALID]                   = "CHK_OP_VALID",
  79         [RESPST_CHK_RESOURCE]                   = "CHK_RESOURCE",
  80         [RESPST_CHK_LENGTH]                     = "CHK_LENGTH",
  81         [RESPST_CHK_RKEY]                       = "CHK_RKEY",
  82         [RESPST_EXECUTE]                        = "EXECUTE",
  83         [RESPST_READ_REPLY]                     = "READ_REPLY",
  84         [RESPST_COMPLETE]                       = "COMPLETE",
  85         [RESPST_ACKNOWLEDGE]                    = "ACKNOWLEDGE",
  86         [RESPST_CLEANUP]                        = "CLEANUP",
  87         [RESPST_DUPLICATE_REQUEST]              = "DUPLICATE_REQUEST",
  88         [RESPST_ERR_MALFORMED_WQE]              = "ERR_MALFORMED_WQE",
  89         [RESPST_ERR_UNSUPPORTED_OPCODE]         = "ERR_UNSUPPORTED_OPCODE",
  90         [RESPST_ERR_MISALIGNED_ATOMIC]          = "ERR_MISALIGNED_ATOMIC",
  91         [RESPST_ERR_PSN_OUT_OF_SEQ]             = "ERR_PSN_OUT_OF_SEQ",
  92         [RESPST_ERR_MISSING_OPCODE_FIRST]       = "ERR_MISSING_OPCODE_FIRST",
  93         [RESPST_ERR_MISSING_OPCODE_LAST_C]      = "ERR_MISSING_OPCODE_LAST_C",
  94         [RESPST_ERR_MISSING_OPCODE_LAST_D1E]    = "ERR_MISSING_OPCODE_LAST_D1E",
  95         [RESPST_ERR_TOO_MANY_RDMA_ATM_REQ]      = "ERR_TOO_MANY_RDMA_ATM_REQ",
  96         [RESPST_ERR_RNR]                        = "ERR_RNR",
  97         [RESPST_ERR_RKEY_VIOLATION]             = "ERR_RKEY_VIOLATION",
  98         [RESPST_ERR_LENGTH]                     = "ERR_LENGTH",
  99         [RESPST_ERR_CQ_OVERFLOW]                = "ERR_CQ_OVERFLOW",
 100         [RESPST_ERROR]                          = "ERROR",
 101         [RESPST_RESET]                          = "RESET",
 102         [RESPST_DONE]                           = "DONE",
 103         [RESPST_EXIT]                           = "EXIT",
 104 };
 105
 106 /* rxe_recv calls here to add a request packet to the input queue */
 107 void rxe_resp_queue_pkt(struct rxe_qp *qp, struct sk_buff *skb)
 108 {
 109         int must_sched;
 110         struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
 111
 112         skb_queue_tail(&qp->req_pkts, skb);
 113
 114         must_sched = (pkt->opcode == IB_OPCODE_RC_RDMA_READ_REQUEST) ||
 115                         (skb_queue_len(&qp->req_pkts) > 1);
 116
 117         rxe_run_task(&qp->resp.task, must_sched);
 118 }
 119
 120 static inline enum resp_states get_req(struct rxe_qp *qp,
 121                                        struct rxe_pkt_info **pkt_p)
 122 {
 123         struct sk_buff *skb;
 124
 125         if (qp->resp.state == QP_STATE_ERROR) {
 126                 while ((skb = skb_dequeue(&qp->req_pkts))) {
 127                         rxe_drop_ref(qp);
 128                         kfree_skb(skb);
 129                 }
 130
 131                 /* go drain recv wr queue */
 132                 return RESPST_CHK_RESOURCE;
 133         }
 134
 135         skb = skb_peek(&qp->req_pkts);
 136         if (!skb)
 137                 return RESPST_EXIT;
 138
 139         *pkt_p = SKB_TO_PKT(skb);
 140
 141         return (qp->resp.res) ? RESPST_READ_REPLY : RESPST_CHK_PSN;
 142 }
 143
 144 static enum resp_states check_psn(struct rxe_qp *qp,
 145                                   struct rxe_pkt_info *pkt)
 146 {
 147         int diff = psn_compare(pkt->psn, qp->resp.psn);
 148         struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
 149
 150         switch (qp_type(qp)) {
 151         case IB_QPT_RC:
 152                 if (diff > 0) {
 153                         if (qp->resp.sent_psn_nak)
 154                                 return RESPST_CLEANUP;
 155
 156                         qp->resp.sent_psn_nak = 1;
 157                         rxe_counter_inc(rxe, RXE_CNT_OUT_OF_SEQ_REQ);
 158                         return RESPST_ERR_PSN_OUT_OF_SEQ;
 159
 160                 } else if (diff < 0) {
 161                         rxe_counter_inc(rxe, RXE_CNT_DUP_REQ);
 162                         return RESPST_DUPLICATE_REQUEST;
 163                 }
 164
 165                 if (qp->resp.sent_psn_nak)
 166                         qp->resp.sent_psn_nak = 0;
 167
 168                 break;
 169
 170         case IB_QPT_UC:
 171                 if (qp->resp.drop_msg || diff != 0) {
 172                         if (pkt->mask & RXE_START_MASK) {
 173                                 qp->resp.drop_msg = 0;
 174                                 return RESPST_CHK_OP_SEQ;
 175                         }
 176
 177                         qp->resp.drop_msg = 1;
 178                         return RESPST_CLEANUP;
 179                 }
 180                 break;
 181         default:
 182                 break;
 183         }
 184
 185         return RESPST_CHK_OP_SEQ;
 186 }
 187
 188 static enum resp_states check_op_seq(struct rxe_qp *qp,
 189                                      struct rxe_pkt_info *pkt)
 190 {
 191         switch (qp_type(qp)) {
 192         case IB_QPT_RC:
 193                 switch (qp->resp.opcode) {
 194                 case IB_OPCODE_RC_SEND_FIRST:
 195                 case IB_OPCODE_RC_SEND_MIDDLE:
 196                         switch (pkt->opcode) {
 197                         case IB_OPCODE_RC_SEND_MIDDLE:
 198                         case IB_OPCODE_RC_SEND_LAST:
 199                         case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE:
 200                         case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE:
 201                                 return RESPST_CHK_OP_VALID;
 202                         default:
 203                                 return RESPST_ERR_MISSING_OPCODE_LAST_C;
 204                         }
 205
 206                 case IB_OPCODE_RC_RDMA_WRITE_FIRST:
 207                 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
 208                         switch (pkt->opcode) {
 209                         case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
 210                         case IB_OPCODE_RC_RDMA_WRITE_LAST:
 211                         case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
 212                                 return RESPST_CHK_OP_VALID;
 213                         default:
 214                                 return RESPST_ERR_MISSING_OPCODE_LAST_C;
 215                         }
 216
 217                 default:
 218                         switch (pkt->opcode) {
 219                         case IB_OPCODE_RC_SEND_MIDDLE:
 220                         case IB_OPCODE_RC_SEND_LAST:
 221                         case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE:
 222                         case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE:
 223                         case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
 224                         case IB_OPCODE_RC_RDMA_WRITE_LAST:
 225                         case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
 226                                 return RESPST_ERR_MISSING_OPCODE_FIRST;
 227                         default:
 228                                 return RESPST_CHK_OP_VALID;
 229                         }
 230                 }
 231                 break;
 232
 233         case IB_QPT_UC:
 234                 switch (qp->resp.opcode) {
 235                 case IB_OPCODE_UC_SEND_FIRST:
 236                 case IB_OPCODE_UC_SEND_MIDDLE:
 237                         switch (pkt->opcode) {
 238                         case IB_OPCODE_UC_SEND_MIDDLE:
 239                         case IB_OPCODE_UC_SEND_LAST:
 240                         case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE:
 241                                 return RESPST_CHK_OP_VALID;
 242                         default:
 243                                 return RESPST_ERR_MISSING_OPCODE_LAST_D1E;
 244                         }
 245
 246                 case IB_OPCODE_UC_RDMA_WRITE_FIRST:
 247                 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
 248                         switch (pkt->opcode) {
 249                         case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
 250                         case IB_OPCODE_UC_RDMA_WRITE_LAST:
 251                         case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
 252                                 return RESPST_CHK_OP_VALID;
 253                         default:
 254                                 return RESPST_ERR_MISSING_OPCODE_LAST_D1E;
 255                         }
 256
 257                 default:
 258                         switch (pkt->opcode) {
 259                         case IB_OPCODE_UC_SEND_MIDDLE:
 260                         case IB_OPCODE_UC_SEND_LAST:
 261                         case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE:
 262                         case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
 263                         case IB_OPCODE_UC_RDMA_WRITE_LAST:
 264                         case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
 265                                 qp->resp.drop_msg = 1;
 266                                 return RESPST_CLEANUP;
 267                         default:
 268                                 return RESPST_CHK_OP_VALID;
 269                         }
 270                 }
 271                 break;
 272
 273         default:
 274                 return RESPST_CHK_OP_VALID;
 275         }
 276 }
 277
 278 static enum resp_states check_op_valid(struct rxe_qp *qp,
 279                                        struct rxe_pkt_info *pkt)
 280 {
 281         switch (qp_type(qp)) {
 282         case IB_QPT_RC:
 283                 if (((pkt->mask & RXE_READ_MASK) &&
 284                      !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_READ)) ||
 285                     ((pkt->mask & RXE_WRITE_MASK) &&
 286                      !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) ||
 287                     ((pkt->mask & RXE_ATOMIC_MASK) &&
 288                      !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) {
 289                         return RESPST_ERR_UNSUPPORTED_OPCODE;
 290                 }
 291
 292                 break;
 293
 294         case IB_QPT_UC:
 295                 if ((pkt->mask & RXE_WRITE_MASK) &&
 296                     !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) {
 297                         qp->resp.drop_msg = 1;
 298                         return RESPST_CLEANUP;
 299                 }
 300
 301                 break;
 302
 303         case IB_QPT_UD:
 304         case IB_QPT_SMI:
 305         case IB_QPT_GSI:
 306                 break;
 307
 308         default:
 309                 WARN_ON_ONCE(1);
 310                 break;
 311         }
 312
 313         return RESPST_CHK_RESOURCE;
 314 }
 315
 316 static enum resp_states get_srq_wqe(struct rxe_qp *qp)
 317 {
 318         struct rxe_srq *srq = qp->srq;
 319         struct rxe_queue *q = srq->rq.queue;
 320         struct rxe_recv_wqe *wqe;
 321         struct ib_event ev;
 322
 323         if (srq->error)
 324                 return RESPST_ERR_RNR;
 325
 326         spin_lock_bh(&srq->rq.consumer_lock);
 327
 328         wqe = queue_head(q);
 329         if (!wqe) {
 330                 spin_unlock_bh(&srq->rq.consumer_lock);
 331                 return RESPST_ERR_RNR;
 332         }
 333
 334         /* note kernel and user space recv wqes have same size */
 335         memcpy(&qp->resp.srq_wqe, wqe, sizeof(qp->resp.srq_wqe));
 336
 337         qp->resp.wqe = &qp->resp.srq_wqe.wqe;
 338         advance_consumer(q);
 339
 340         if (srq->limit && srq->ibsrq.event_handler &&
 341             (queue_count(q) < srq->limit)) {
 342                 srq->limit = 0;
 343                 goto event;
 344         }
 345
 346         spin_unlock_bh(&srq->rq.consumer_lock);
 347         return RESPST_CHK_LENGTH;
 348
 349 event:
 350         spin_unlock_bh(&srq->rq.consumer_lock);
 351         ev.device = qp->ibqp.device;
 352         ev.element.srq = qp->ibqp.srq;
 353         ev.event = IB_EVENT_SRQ_LIMIT_REACHED;
 354         srq->ibsrq.event_handler(&ev, srq->ibsrq.srq_context);
 355         return RESPST_CHK_LENGTH;
 356 }
 357
 358 static enum resp_states check_resource(struct rxe_qp *qp,
 359                                        struct rxe_pkt_info *pkt)
 360 {
 361         struct rxe_srq *srq = qp->srq;
 362
 363         if (qp->resp.state == QP_STATE_ERROR) {
 364                 if (qp->resp.wqe) {
 365                         qp->resp.status = IB_WC_WR_FLUSH_ERR;
 366                         return RESPST_COMPLETE;
 367                 } else if (!srq) {
 368                         qp->resp.wqe = queue_head(qp->rq.queue);
 369                         if (qp->resp.wqe) {
 370                                 qp->resp.status = IB_WC_WR_FLUSH_ERR;
 371                                 return RESPST_COMPLETE;
 372                         } else {
 373                                 return RESPST_EXIT;
 374                         }
 375                 } else {
 376                         return RESPST_EXIT;
 377                 }
 378         }
 379
 380         if (pkt->mask & RXE_READ_OR_ATOMIC) {
 381                 /* it is the requesters job to not send
 382                  * too many read/atomic ops, we just
 383                  * recycle the responder resource queue
 384                  */
 385                 if (likely(qp->attr.max_dest_rd_atomic > 0))
 386                         return RESPST_CHK_LENGTH;
 387                 else
 388                         return RESPST_ERR_TOO_MANY_RDMA_ATM_REQ;
 389         }
 390
 391         if (pkt->mask & RXE_RWR_MASK) {
 392                 if (srq)
 393                         return get_srq_wqe(qp);
 394
 395                 qp->resp.wqe = queue_head(qp->rq.queue);
 396                 return (qp->resp.wqe) ? RESPST_CHK_LENGTH : RESPST_ERR_RNR;
 397         }
 398
 399         return RESPST_CHK_LENGTH;
 400 }
 401
 402 static enum resp_states check_length(struct rxe_qp *qp,
 403                                      struct rxe_pkt_info *pkt)
 404 {
 405         switch (qp_type(qp)) {
 406         case IB_QPT_RC:
 407                 return RESPST_CHK_RKEY;
 408
 409         case IB_QPT_UC:
 410                 return RESPST_CHK_RKEY;
 411
 412         default:
 413                 return RESPST_CHK_RKEY;
 414         }
 415 }
 416
 417 static enum resp_states check_rkey(struct rxe_qp *qp,
 418                                    struct rxe_pkt_info *pkt)
 419 {
 420         struct rxe_mem *mem = NULL;
 421         u64 va;
 422         u32 rkey;
 423         u32 resid;
 424         u32 pktlen;
 425         int mtu = qp->mtu;
 426         enum resp_states state;
 427         int access;
 428
 429         if (pkt->mask & (RXE_READ_MASK | RXE_WRITE_MASK)) {
 430                 if (pkt->mask & RXE_RETH_MASK) {
 431                         qp->resp.va = reth_va(pkt);
 432                         qp->resp.rkey = reth_rkey(pkt);
 433                         qp->resp.resid = reth_len(pkt);
 434                         qp->resp.length = reth_len(pkt);
 435                 }
 436                 access = (pkt->mask & RXE_READ_MASK) ? IB_ACCESS_REMOTE_READ
 437                                                      : IB_ACCESS_REMOTE_WRITE;
 438         } else if (pkt->mask & RXE_ATOMIC_MASK) {
 439                 qp->resp.va = atmeth_va(pkt);
 440                 qp->resp.rkey = atmeth_rkey(pkt);
 441                 qp->resp.resid = sizeof(u64);
 442                 access = IB_ACCESS_REMOTE_ATOMIC;
 443         } else {
 444                 return RESPST_EXECUTE;
 445         }
 446
 447         /* A zero-byte op is not required to set an addr or rkey. */
 448         if ((pkt->mask & (RXE_READ_MASK | RXE_WRITE_OR_SEND)) &&
 449             (pkt->mask & RXE_RETH_MASK) &&
 450             reth_len(pkt) == 0) {
 451                 return RESPST_EXECUTE;
 452         }
 453
 454         va      = qp->resp.va;
 455         rkey    = qp->resp.rkey;
 456         resid   = qp->resp.resid;
 457         pktlen  = payload_size(pkt);
 458
 459         mem = lookup_mem(qp->pd, access, rkey, lookup_remote);
 460         if (!mem) {
 461                 state = RESPST_ERR_RKEY_VIOLATION;
 462                 goto err;
 463         }
 464
 465         if (unlikely(mem->state == RXE_MEM_STATE_FREE)) {
 466                 state = RESPST_ERR_RKEY_VIOLATION;
 467                 goto err;
 468         }
 469
 470         if (mem_check_range(mem, va, resid)) {
 471                 state = RESPST_ERR_RKEY_VIOLATION;
 472                 goto err;
 473         }
 474
 475         if (pkt->mask & RXE_WRITE_MASK)  {
 476                 if (resid > mtu) {
 477                         if (pktlen != mtu || bth_pad(pkt)) {
 478                                 state = RESPST_ERR_LENGTH;
 479                                 goto err;
 480                         }
 481                 } else {
 482                         if (pktlen != resid) {
 483                                 state = RESPST_ERR_LENGTH;
 484                                 goto err;
 485                         }
 486                         if ((bth_pad(pkt) != (0x3 & (-resid)))) {
 487                                 /* This case may not be exactly that
 488                                  * but nothing else fits.
 489                                  */
 490                                 state = RESPST_ERR_LENGTH;
 491                                 goto err;
 492                         }
 493                 }
 494         }
 495
 496         WARN_ON_ONCE(qp->resp.mr);
 497
 498         qp->resp.mr = mem;
 499         return RESPST_EXECUTE;
 500
 501 err:
 502         if (mem)
 503                 rxe_drop_ref(mem);
 504         return state;
 505 }
 506
 507 static enum resp_states send_data_in(struct rxe_qp *qp, void *data_addr,
 508                                      int data_len)
 509 {
 510         int err;
 511
 512         err = copy_data(qp->pd, IB_ACCESS_LOCAL_WRITE, &qp->resp.wqe->dma,
 513                         data_addr, data_len, to_mem_obj, NULL);
 514         if (unlikely(err))
 515                 return (err == -ENOSPC) ? RESPST_ERR_LENGTH
 516                                         : RESPST_ERR_MALFORMED_WQE;
 517
 518         return RESPST_NONE;
 519 }
 520
 521 static enum resp_states write_data_in(struct rxe_qp *qp,
 522                                       struct rxe_pkt_info *pkt)
 523 {
 524         enum resp_states rc = RESPST_NONE;
 525         int     err;
 526         int data_len = payload_size(pkt);
 527
 528         err = rxe_mem_copy(qp->resp.mr, qp->resp.va, payload_addr(pkt),
 529                            data_len, to_mem_obj, NULL);
 530         if (err) {
 531                 rc = RESPST_ERR_RKEY_VIOLATION;
 532                 goto out;
 533         }
 534
 535         qp->resp.va += data_len;
 536         qp->resp.resid -= data_len;
 537
 538 out:
 539         return rc;
 540 }
 541
 542 /* Guarantee atomicity of atomic operations at the machine level. */
 543 static DEFINE_SPINLOCK(atomic_ops_lock);
 544
 545 static enum resp_states process_atomic(struct rxe_qp *qp,
 546                                        struct rxe_pkt_info *pkt)
 547 {
 548         u64 iova = atmeth_va(pkt);
 549         u64 *vaddr;
 550         enum resp_states ret;
 551         struct rxe_mem *mr = qp->resp.mr;
 552
 553         if (mr->state != RXE_MEM_STATE_VALID) {
 554                 ret = RESPST_ERR_RKEY_VIOLATION;
 555                 goto out;
 556         }
 557
 558         vaddr = iova_to_vaddr(mr, iova, sizeof(u64));
 559
 560         /* check vaddr is 8 bytes aligned. */
 561         if (!vaddr || (uintptr_t)vaddr & 7) {
 562                 ret = RESPST_ERR_MISALIGNED_ATOMIC;
 563                 goto out;
 564         }
 565
 566         spin_lock_bh(&atomic_ops_lock);
 567
 568         qp->resp.atomic_orig = *vaddr;
 569
 570         if (pkt->opcode == IB_OPCODE_RC_COMPARE_SWAP ||
 571             pkt->opcode == IB_OPCODE_RD_COMPARE_SWAP) {
 572                 if (*vaddr == atmeth_comp(pkt))
 573                         *vaddr = atmeth_swap_add(pkt);
 574         } else {
 575                 *vaddr += atmeth_swap_add(pkt);
 576         }
 577
 578         spin_unlock_bh(&atomic_ops_lock);
 579
 580         ret = RESPST_NONE;
 581 out:
 582         return ret;
 583 }
 584
 585 static struct sk_buff *prepare_ack_packet(struct rxe_qp *qp,
 586                                           struct rxe_pkt_info *pkt,
 587                                           struct rxe_pkt_info *ack,
 588                                           int opcode,
 589                                           int payload,
 590                                           u32 psn,
 591                                           u8 syndrome,
 592                                           u32 *crcp)
 593 {
 594         struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
 595         struct sk_buff *skb;
 596         u32 crc = 0;
 597         u32 *p;
 598         int paylen;
 599         int pad;
 600         int err;
 601
 602         /*
 603          * allocate packet
 604          */
 605         pad = (-payload) & 0x3;
 606         paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE;
 607
 608         skb = rxe_init_packet(rxe, &qp->pri_av, paylen, ack);
 609         if (!skb)
 610                 return NULL;
 611
 612         ack->qp = qp;
 613         ack->opcode = opcode;
 614         ack->mask = rxe_opcode[opcode].mask;
 615         ack->offset = pkt->offset;
 616         ack->paylen = paylen;
 617
 618         /* fill in bth using the request packet headers */
 619         memcpy(ack->hdr, pkt->hdr, pkt->offset + RXE_BTH_BYTES);
 620
 621         bth_set_opcode(ack, opcode);
 622         bth_set_qpn(ack, qp->attr.dest_qp_num);
 623         bth_set_pad(ack, pad);
 624         bth_set_se(ack, 0);
 625         bth_set_psn(ack, psn);
 626         bth_set_ack(ack, 0);
 627         ack->psn = psn;
 628
 629         if (ack->mask & RXE_AETH_MASK) {
 630                 aeth_set_syn(ack, syndrome);
 631                 aeth_set_msn(ack, qp->resp.msn);
 632         }
 633
 634         if (ack->mask & RXE_ATMACK_MASK)
 635                 atmack_set_orig(ack, qp->resp.atomic_orig);
 636
 637         err = rxe_prepare(ack, skb, &crc);
 638         if (err) {
 639                 kfree_skb(skb);
 640                 return NULL;
 641         }
 642
 643         if (crcp) {
 644                 /* CRC computation will be continued by the caller */
 645                 *crcp = crc;
 646         } else {
 647                 p = payload_addr(ack) + payload + bth_pad(ack);
 648                 *p = ~crc;
 649         }
 650
 651         return skb;
 652 }
 653
 654 /* RDMA read response. If res is not NULL, then we have a current RDMA request
 655  * being processed or replayed.
 656  */
 657 static enum resp_states read_reply(struct rxe_qp *qp,
 658                                    struct rxe_pkt_info *req_pkt)
 659 {
 660         struct rxe_pkt_info ack_pkt;
 661         struct sk_buff *skb;
 662         int mtu = qp->mtu;
 663         enum resp_states state;
 664         int payload;
 665         int opcode;
 666         int err;
 667         struct resp_res *res = qp->resp.res;
 668         u32 icrc;
 669         u32 *p;
 670
 671         if (!res) {
 672                 /* This is the first time we process that request. Get a
 673                  * resource
 674                  */
 675                 res = &qp->resp.resources[qp->resp.res_head];
 676
 677                 free_rd_atomic_resource(qp, res);
 678                 rxe_advance_resp_resource(qp);
 679
 680                 res->type               = RXE_READ_MASK;
 681                 res->replay             = 0;
 682
 683                 res->read.va            = qp->resp.va;
 684                 res->read.va_org        = qp->resp.va;
 685
 686                 res->first_psn          = req_pkt->psn;
 687
 688                 if (reth_len(req_pkt)) {
 689                         res->last_psn   = (req_pkt->psn +
 690                                            (reth_len(req_pkt) + mtu - 1) /
 691                                            mtu - 1) & BTH_PSN_MASK;
 692                 } else {
 693                         res->last_psn   = res->first_psn;
 694                 }
 695                 res->cur_psn            = req_pkt->psn;
 696
 697                 res->read.resid         = qp->resp.resid;
 698                 res->read.length        = qp->resp.resid;
 699                 res->read.rkey          = qp->resp.rkey;
 700
 701                 /* note res inherits the reference to mr from qp */
 702                 res->read.mr            = qp->resp.mr;
 703                 qp->resp.mr             = NULL;
 704
 705                 qp->resp.res            = res;
 706                 res->state              = rdatm_res_state_new;
 707         }
 708
 709         if (res->state == rdatm_res_state_new) {
 710                 if (res->read.resid <= mtu)
 711                         opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_ONLY;
 712                 else
 713                         opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST;
 714         } else {
 715                 if (res->read.resid > mtu)
 716                         opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE;
 717                 else
 718                         opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_LAST;
 719         }
 720
 721         res->state = rdatm_res_state_next;
 722
 723         payload = min_t(int, res->read.resid, mtu);
 724
 725         skb = prepare_ack_packet(qp, req_pkt, &ack_pkt, opcode, payload,
 726                                  res->cur_psn, AETH_ACK_UNLIMITED, &icrc);
 727         if (!skb)
 728                 return RESPST_ERR_RNR;
 729
 730         err = rxe_mem_copy(res->read.mr, res->read.va, payload_addr(&ack_pkt),
 731                            payload, from_mem_obj, &icrc);
 732         if (err)
 733                 pr_err("Failed copying memory\n");
 734
 735         p = payload_addr(&ack_pkt) + payload + bth_pad(&ack_pkt);
 736         *p = ~icrc;
 737
 738         err = rxe_xmit_packet(qp, &ack_pkt, skb);
 739         if (err) {
 740                 pr_err("Failed sending RDMA reply.\n");
 741                 return RESPST_ERR_RNR;
 742         }
 743
 744         res->read.va += payload;
 745         res->read.resid -= payload;
 746         res->cur_psn = (res->cur_psn + 1) & BTH_PSN_MASK;
 747
 748         if (res->read.resid > 0) {
 749                 state = RESPST_DONE;
 750         } else {
 751                 qp->resp.res = NULL;
 752                 if (!res->replay)
 753                         qp->resp.opcode = -1;
 754                 if (psn_compare(res->cur_psn, qp->resp.psn) >= 0)
 755                         qp->resp.psn = res->cur_psn;
 756                 state = RESPST_CLEANUP;
 757         }
 758
 759         return state;
 760 }
 761
 762 static void build_rdma_network_hdr(union rdma_network_hdr *hdr,
 763                                    struct rxe_pkt_info *pkt)
 764 {
 765         struct sk_buff *skb = PKT_TO_SKB(pkt);
 766
 767         memset(hdr, 0, sizeof(*hdr));
 768         if (skb->protocol == htons(ETH_P_IP))
 769                 memcpy(&hdr->roce4grh, ip_hdr(skb), sizeof(hdr->roce4grh));
 770         else if (skb->protocol == htons(ETH_P_IPV6))
 771                 memcpy(&hdr->ibgrh, ipv6_hdr(skb), sizeof(hdr->ibgrh));
 772 }
 773
 774 /* Executes a new request. A retried request never reach that function (send
 775  * and writes are discarded, and reads and atomics are retried elsewhere.
 776  */
 777 static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt)
 778 {
 779         enum resp_states err;
 780
 781         if (pkt->mask & RXE_SEND_MASK) {
 782                 if (qp_type(qp) == IB_QPT_UD ||
 783                     qp_type(qp) == IB_QPT_SMI ||
 784                     qp_type(qp) == IB_QPT_GSI) {
 785                         union rdma_network_hdr hdr;
 786
 787                         build_rdma_network_hdr(&hdr, pkt);
 788
 789                         err = send_data_in(qp, &hdr, sizeof(hdr));
 790                         if (err)
 791                                 return err;
 792                 }
 793                 err = send_data_in(qp, payload_addr(pkt), payload_size(pkt));
 794                 if (err)
 795                         return err;
 796         } else if (pkt->mask & RXE_WRITE_MASK) {
 797                 err = write_data_in(qp, pkt);
 798                 if (err)
 799                         return err;
 800         } else if (pkt->mask & RXE_READ_MASK) {
 801                 /* For RDMA Read we can increment the msn now. See C9-148. */
 802                 qp->resp.msn++;
 803                 return RESPST_READ_REPLY;
 804         } else if (pkt->mask & RXE_ATOMIC_MASK) {
 805                 err = process_atomic(qp, pkt);
 806                 if (err)
 807                         return err;
 808         } else {
 809                 /* Unreachable */
 810                 WARN_ON_ONCE(1);
 811         }
 812
 813         /* next expected psn, read handles this separately */
 814         qp->resp.psn = (pkt->psn + 1) & BTH_PSN_MASK;
 815         qp->resp.ack_psn = qp->resp.psn;
 816
 817         qp->resp.opcode = pkt->opcode;
 818         qp->resp.status = IB_WC_SUCCESS;
 819
 820         if (pkt->mask & RXE_COMP_MASK) {
 821                 /* We successfully processed this new request. */
 822                 qp->resp.msn++;
 823                 return RESPST_COMPLETE;
 824         } else if (qp_type(qp) == IB_QPT_RC)
 825                 return RESPST_ACKNOWLEDGE;
 826         else
 827                 return RESPST_CLEANUP;
 828 }
 829
 830 static enum resp_states do_complete(struct rxe_qp *qp,
 831                                     struct rxe_pkt_info *pkt)
 832 {
 833         struct rxe_cqe cqe;
 834         struct ib_wc *wc = &cqe.ibwc;
 835         struct ib_uverbs_wc *uwc = &cqe.uibwc;
 836         struct rxe_recv_wqe *wqe = qp->resp.wqe;
 837         struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
 838
 839         if (unlikely(!wqe))
 840                 return RESPST_CLEANUP;
 841
 842         memset(&cqe, 0, sizeof(cqe));
 843
 844         if (qp->rcq->is_user) {
 845                 uwc->status             = qp->resp.status;
 846                 uwc->qp_num             = qp->ibqp.qp_num;
 847                 uwc->wr_id              = wqe->wr_id;
 848         } else {
 849                 wc->status              = qp->resp.status;
 850                 wc->qp                  = &qp->ibqp;
 851                 wc->wr_id               = wqe->wr_id;
 852         }
 853
 854         if (wc->status == IB_WC_SUCCESS) {
 855                 rxe_counter_inc(rxe, RXE_CNT_RDMA_RECV);
 856                 wc->opcode = (pkt->mask & RXE_IMMDT_MASK &&
 857                                 pkt->mask & RXE_WRITE_MASK) ?
 858                                         IB_WC_RECV_RDMA_WITH_IMM : IB_WC_RECV;
 859                 wc->vendor_err = 0;
 860                 wc->byte_len = (pkt->mask & RXE_IMMDT_MASK &&
 861                                 pkt->mask & RXE_WRITE_MASK) ?
 862                                         qp->resp.length : wqe->dma.length - wqe->dma.resid;
 863
 864                 /* fields after byte_len are different between kernel and user
 865                  * space
 866                  */
 867                 if (qp->rcq->is_user) {
 868                         uwc->wc_flags = IB_WC_GRH;
 869
 870                         if (pkt->mask & RXE_IMMDT_MASK) {
 871                                 uwc->wc_flags |= IB_WC_WITH_IMM;
 872                                 uwc->ex.imm_data = immdt_imm(pkt);
 873                         }
 874
 875                         if (pkt->mask & RXE_IETH_MASK) {
 876                                 uwc->wc_flags |= IB_WC_WITH_INVALIDATE;
 877                                 uwc->ex.invalidate_rkey = ieth_rkey(pkt);
 878                         }
 879
 880                         uwc->qp_num             = qp->ibqp.qp_num;
 881
 882                         if (pkt->mask & RXE_DETH_MASK)
 883                                 uwc->src_qp = deth_sqp(pkt);
 884
 885                         uwc->port_num           = qp->attr.port_num;
 886                 } else {
 887                         struct sk_buff *skb = PKT_TO_SKB(pkt);
 888
 889                         wc->wc_flags = IB_WC_GRH | IB_WC_WITH_NETWORK_HDR_TYPE;
 890                         if (skb->protocol == htons(ETH_P_IP))
 891                                 wc->network_hdr_type = RDMA_NETWORK_IPV4;
 892                         else
 893                                 wc->network_hdr_type = RDMA_NETWORK_IPV6;
 894
 895                         if (is_vlan_dev(skb->dev)) {
 896                                 wc->wc_flags |= IB_WC_WITH_VLAN;
 897                                 wc->vlan_id = vlan_dev_vlan_id(skb->dev);
 898                         }
 899
 900                         if (pkt->mask & RXE_IMMDT_MASK) {
 901                                 wc->wc_flags |= IB_WC_WITH_IMM;
 902                                 wc->ex.imm_data = immdt_imm(pkt);
 903                         }
 904
 905                         if (pkt->mask & RXE_IETH_MASK) {
 906                                 struct rxe_mem *rmr;
 907
 908                                 wc->wc_flags |= IB_WC_WITH_INVALIDATE;
 909                                 wc->ex.invalidate_rkey = ieth_rkey(pkt);
 910
 911                                 rmr = rxe_pool_get_index(&rxe->mr_pool,
 912                                                          wc->ex.invalidate_rkey >> 8);
 913                                 if (unlikely(!rmr)) {
 914                                         pr_err("Bad rkey %#x invalidation\n",
 915                                                wc->ex.invalidate_rkey);
 916                                         return RESPST_ERROR;
 917                                 }
 918                                 rmr->state = RXE_MEM_STATE_FREE;
 919                                 rxe_drop_ref(rmr);
 920                         }
 921
 922                         wc->qp                  = &qp->ibqp;
 923
 924                         if (pkt->mask & RXE_DETH_MASK)
 925                                 wc->src_qp = deth_sqp(pkt);
 926
 927                         wc->port_num            = qp->attr.port_num;
 928                 }
 929         }
 930
 931         /* have copy for srq and reference for !srq */
 932         if (!qp->srq)
 933                 advance_consumer(qp->rq.queue);
 934
 935         qp->resp.wqe = NULL;
 936
 937         if (rxe_cq_post(qp->rcq, &cqe, pkt ? bth_se(pkt) : 1))
 938                 return RESPST_ERR_CQ_OVERFLOW;
 939
 940         if (qp->resp.state == QP_STATE_ERROR)
 941                 return RESPST_CHK_RESOURCE;
 942
 943         if (!pkt)
 944                 return RESPST_DONE;
 945         else if (qp_type(qp) == IB_QPT_RC)
 946                 return RESPST_ACKNOWLEDGE;
 947         else
 948                 return RESPST_CLEANUP;
 949 }
 950
 951 static int send_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
 952                     u8 syndrome, u32 psn)
 953 {
 954         int err = 0;
 955         struct rxe_pkt_info ack_pkt;
 956         struct sk_buff *skb;
 957
 958         skb = prepare_ack_packet(qp, pkt, &ack_pkt, IB_OPCODE_RC_ACKNOWLEDGE,
 959                                  0, psn, syndrome, NULL);
 960         if (!skb) {
 961                 err = -ENOMEM;
 962                 goto err1;
 963         }
 964
 965         err = rxe_xmit_packet(qp, &ack_pkt, skb);
 966         if (err)
 967                 pr_err_ratelimited("Failed sending ack\n");
 968
 969 err1:
 970         return err;
 971 }
 972
 973 static int send_atomic_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
 974                            u8 syndrome)
 975 {
 976         int rc = 0;
 977         struct rxe_pkt_info ack_pkt;
 978         struct sk_buff *skb;
 979         struct resp_res *res;
 980
 981         skb = prepare_ack_packet(qp, pkt, &ack_pkt,
 982                                  IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE, 0, pkt->psn,
 983                                  syndrome, NULL);
 984         if (!skb) {
 985                 rc = -ENOMEM;
 986                 goto out;
 987         }
 988
 989         rxe_add_ref(qp);
 990
 991         res = &qp->resp.resources[qp->resp.res_head];
 992         free_rd_atomic_resource(qp, res);
 993         rxe_advance_resp_resource(qp);
 994
 995         memcpy(SKB_TO_PKT(skb), &ack_pkt, sizeof(ack_pkt));
 996         memset((unsigned char *)SKB_TO_PKT(skb) + sizeof(ack_pkt), 0,
 997                sizeof(skb->cb) - sizeof(ack_pkt));
 998
 999         skb_get(skb);
1000         res->type = RXE_ATOMIC_MASK;
1001         res->atomic.skb = skb;
1002         res->first_psn = ack_pkt.psn;
1003         res->last_psn  = ack_pkt.psn;
1004         res->cur_psn   = ack_pkt.psn;
1005
1006         rc = rxe_xmit_packet(qp, &ack_pkt, skb);
1007         if (rc) {
1008                 pr_err_ratelimited("Failed sending ack\n");
1009                 rxe_drop_ref(qp);
1010         }
1011 out:
1012         return rc;
1013 }
1014
1015 static enum resp_states acknowledge(struct rxe_qp *qp,
1016                                     struct rxe_pkt_info *pkt)
1017 {
1018         if (qp_type(qp) != IB_QPT_RC)
1019                 return RESPST_CLEANUP;
1020
1021         if (qp->resp.aeth_syndrome != AETH_ACK_UNLIMITED)
1022                 send_ack(qp, pkt, qp->resp.aeth_syndrome, pkt->psn);
1023         else if (pkt->mask & RXE_ATOMIC_MASK)
1024                 send_atomic_ack(qp, pkt, AETH_ACK_UNLIMITED);
1025         else if (bth_ack(pkt))
1026                 send_ack(qp, pkt, AETH_ACK_UNLIMITED, pkt->psn);
1027
1028         return RESPST_CLEANUP;
1029 }
1030
1031 static enum resp_states cleanup(struct rxe_qp *qp,
1032                                 struct rxe_pkt_info *pkt)
1033 {
1034         struct sk_buff *skb;
1035
1036         if (pkt) {
1037                 skb = skb_dequeue(&qp->req_pkts);
1038                 rxe_drop_ref(qp);
1039                 kfree_skb(skb);
1040         }
1041
1042         if (qp->resp.mr) {
1043                 rxe_drop_ref(qp->resp.mr);
1044                 qp->resp.mr = NULL;
1045         }
1046
1047         return RESPST_DONE;
1048 }
1049
1050 static struct resp_res *find_resource(struct rxe_qp *qp, u32 psn)
1051 {
1052         int i;
1053
1054         for (i = 0; i < qp->attr.max_dest_rd_atomic; i++) {
1055                 struct resp_res *res = &qp->resp.resources[i];
1056
1057                 if (res->type == 0)
1058                         continue;
1059
1060                 if (psn_compare(psn, res->first_psn) >= 0 &&
1061                     psn_compare(psn, res->last_psn) <= 0) {
1062                         return res;
1063                 }
1064         }
1065
1066         return NULL;
1067 }
1068
1069 static enum resp_states duplicate_request(struct rxe_qp *qp,
1070                                           struct rxe_pkt_info *pkt)
1071 {
1072         enum resp_states rc;
1073         u32 prev_psn = (qp->resp.ack_psn - 1) & BTH_PSN_MASK;
1074
1075         if (pkt->mask & RXE_SEND_MASK ||
1076             pkt->mask & RXE_WRITE_MASK) {
1077                 /* SEND. Ack again and cleanup. C9-105. */
1078                 if (bth_ack(pkt))
1079                         send_ack(qp, pkt, AETH_ACK_UNLIMITED, prev_psn);
1080                 rc = RESPST_CLEANUP;
1081                 goto out;
1082         } else if (pkt->mask & RXE_READ_MASK) {
1083                 struct resp_res *res;
1084
1085                 res = find_resource(qp, pkt->psn);
1086                 if (!res) {
1087                         /* Resource not found. Class D error.  Drop the
1088                          * request.
1089                          */
1090                         rc = RESPST_CLEANUP;
1091                         goto out;
1092                 } else {
1093                         /* Ensure this new request is the same as the previous
1094                          * one or a subset of it.
1095                          */
1096                         u64 iova = reth_va(pkt);
1097                         u32 resid = reth_len(pkt);
1098
1099                         if (iova < res->read.va_org ||
1100                             resid > res->read.length ||
1101                             (iova + resid) > (res->read.va_org +
1102                                               res->read.length)) {
1103                                 rc = RESPST_CLEANUP;
1104                                 goto out;
1105                         }
1106
1107                         if (reth_rkey(pkt) != res->read.rkey) {
1108                                 rc = RESPST_CLEANUP;
1109                                 goto out;
1110                         }
1111
1112                         res->cur_psn = pkt->psn;
1113                         res->state = (pkt->psn == res->first_psn) ?
1114                                         rdatm_res_state_new :
1115                                         rdatm_res_state_replay;
1116                         res->replay = 1;
1117
1118                         /* Reset the resource, except length. */
1119                         res->read.va_org = iova;
1120                         res->read.va = iova;
1121                         res->read.resid = resid;
1122
1123                         /* Replay the RDMA read reply. */
1124                         qp->resp.res = res;
1125                         rc = RESPST_READ_REPLY;
1126                         goto out;
1127                 }
1128         } else {
1129                 struct resp_res *res;
1130
1131                 /* Find the operation in our list of responder resources. */
1132                 res = find_resource(qp, pkt->psn);
1133                 if (res) {
1134                         skb_get(res->atomic.skb);
1135                         /* Resend the result. */
1136                         rc = rxe_xmit_packet(qp, pkt, res->atomic.skb);
1137                         if (rc) {
1138                                 pr_err("Failed resending result. This flow is not handled - skb ignored\n");
1139                                 rc = RESPST_CLEANUP;
1140                                 goto out;
1141                         }
1142                 }
1143
1144                 /* Resource not found. Class D error. Drop the request. */
1145                 rc = RESPST_CLEANUP;
1146                 goto out;
1147         }
1148 out:
1149         return rc;
1150 }
1151
1152 /* Process a class A or C. Both are treated the same in this implementation. */
1153 static void do_class_ac_error(struct rxe_qp *qp, u8 syndrome,
1154                               enum ib_wc_status status)
1155 {
1156         qp->resp.aeth_syndrome  = syndrome;
1157         qp->resp.status         = status;
1158
1159         /* indicate that we should go through the ERROR state */
1160         qp->resp.goto_error     = 1;
1161 }
1162
1163 static enum resp_states do_class_d1e_error(struct rxe_qp *qp)
1164 {
1165         /* UC */
1166         if (qp->srq) {
1167                 /* Class E */
1168                 qp->resp.drop_msg = 1;
1169                 if (qp->resp.wqe) {
1170                         qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1171                         return RESPST_COMPLETE;
1172                 } else {
1173                         return RESPST_CLEANUP;
1174                 }
1175         } else {
1176                 /* Class D1. This packet may be the start of a
1177                  * new message and could be valid. The previous
1178                  * message is invalid and ignored. reset the
1179                  * recv wr to its original state
1180                  */
1181                 if (qp->resp.wqe) {
1182                         qp->resp.wqe->dma.resid = qp->resp.wqe->dma.length;
1183                         qp->resp.wqe->dma.cur_sge = 0;
1184                         qp->resp.wqe->dma.sge_offset = 0;
1185                         qp->resp.opcode = -1;
1186                 }
1187
1188                 if (qp->resp.mr) {
1189                         rxe_drop_ref(qp->resp.mr);
1190                         qp->resp.mr = NULL;
1191                 }
1192
1193                 return RESPST_CLEANUP;
1194         }
1195 }
1196
1197 static void rxe_drain_req_pkts(struct rxe_qp *qp, bool notify)
1198 {
1199         struct sk_buff *skb;
1200
1201         while ((skb = skb_dequeue(&qp->req_pkts))) {
1202                 rxe_drop_ref(qp);
1203                 kfree_skb(skb);
1204         }
1205
1206         if (notify)
1207                 return;
1208
1209         while (!qp->srq && qp->rq.queue && queue_head(qp->rq.queue))
1210                 advance_consumer(qp->rq.queue);
1211 }
1212
1213 int rxe_responder(void *arg)
1214 {
1215         struct rxe_qp *qp = (struct rxe_qp *)arg;
1216         struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
1217         enum resp_states state;
1218         struct rxe_pkt_info *pkt = NULL;
1219         int ret = 0;
1220
1221         rxe_add_ref(qp);
1222
1223         qp->resp.aeth_syndrome = AETH_ACK_UNLIMITED;
1224
1225         if (!qp->valid) {
1226                 ret = -EINVAL;
1227                 goto done;
1228         }
1229
1230         switch (qp->resp.state) {
1231         case QP_STATE_RESET:
1232                 state = RESPST_RESET;
1233                 break;
1234
1235         default:
1236                 state = RESPST_GET_REQ;
1237                 break;
1238         }
1239
1240         while (1) {
1241                 pr_debug("qp#%d state = %s\n", qp_num(qp),
1242                          resp_state_name[state]);
1243                 switch (state) {
1244                 case RESPST_GET_REQ:
1245                         state = get_req(qp, &pkt);
1246                         break;
1247                 case RESPST_CHK_PSN:
1248                         state = check_psn(qp, pkt);
1249                         break;
1250                 case RESPST_CHK_OP_SEQ:
1251                         state = check_op_seq(qp, pkt);
1252                         break;
1253                 case RESPST_CHK_OP_VALID:
1254                         state = check_op_valid(qp, pkt);
1255                         break;
1256                 case RESPST_CHK_RESOURCE:
1257                         state = check_resource(qp, pkt);
1258                         break;
1259                 case RESPST_CHK_LENGTH:
1260                         state = check_length(qp, pkt);
1261                         break;
1262                 case RESPST_CHK_RKEY:
1263                         state = check_rkey(qp, pkt);
1264                         break;
1265                 case RESPST_EXECUTE:
1266                         state = execute(qp, pkt);
1267                         break;
1268                 case RESPST_COMPLETE:
1269                         state = do_complete(qp, pkt);
1270                         break;
1271                 case RESPST_READ_REPLY:
1272                         state = read_reply(qp, pkt);
1273                         break;
1274                 case RESPST_ACKNOWLEDGE:
1275                         state = acknowledge(qp, pkt);
1276                         break;
1277                 case RESPST_CLEANUP:
1278                         state = cleanup(qp, pkt);
1279                         break;
1280                 case RESPST_DUPLICATE_REQUEST:
1281                         state = duplicate_request(qp, pkt);
1282                         break;
1283                 case RESPST_ERR_PSN_OUT_OF_SEQ:
1284                         /* RC only - Class B. Drop packet. */
1285                         send_ack(qp, pkt, AETH_NAK_PSN_SEQ_ERROR, qp->resp.psn);
1286                         state = RESPST_CLEANUP;
1287                         break;
1288
1289                 case RESPST_ERR_TOO_MANY_RDMA_ATM_REQ:
1290                 case RESPST_ERR_MISSING_OPCODE_FIRST:
1291                 case RESPST_ERR_MISSING_OPCODE_LAST_C:
1292                 case RESPST_ERR_UNSUPPORTED_OPCODE:
1293                 case RESPST_ERR_MISALIGNED_ATOMIC:
1294                         /* RC Only - Class C. */
1295                         do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1296                                           IB_WC_REM_INV_REQ_ERR);
1297                         state = RESPST_COMPLETE;
1298                         break;
1299
1300                 case RESPST_ERR_MISSING_OPCODE_LAST_D1E:
1301                         state = do_class_d1e_error(qp);
1302                         break;
1303                 case RESPST_ERR_RNR:
1304                         if (qp_type(qp) == IB_QPT_RC) {
1305                                 rxe_counter_inc(rxe, RXE_CNT_SND_RNR);
1306                                 /* RC - class B */
1307                                 send_ack(qp, pkt, AETH_RNR_NAK |
1308                                          (~AETH_TYPE_MASK &
1309                                          qp->attr.min_rnr_timer),
1310                                          pkt->psn);
1311                         } else {
1312                                 /* UD/UC - class D */
1313                                 qp->resp.drop_msg = 1;
1314                         }
1315                         state = RESPST_CLEANUP;
1316                         break;
1317
1318                 case RESPST_ERR_RKEY_VIOLATION:
1319                         if (qp_type(qp) == IB_QPT_RC) {
1320                                 /* Class C */
1321                                 do_class_ac_error(qp, AETH_NAK_REM_ACC_ERR,
1322                                                   IB_WC_REM_ACCESS_ERR);
1323                                 state = RESPST_COMPLETE;
1324                         } else {
1325                                 qp->resp.drop_msg = 1;
1326                                 if (qp->srq) {
1327                                         /* UC/SRQ Class D */
1328                                         qp->resp.status = IB_WC_REM_ACCESS_ERR;
1329                                         state = RESPST_COMPLETE;
1330                                 } else {
1331                                         /* UC/non-SRQ Class E. */
1332                                         state = RESPST_CLEANUP;
1333                                 }
1334                         }
1335                         break;
1336
1337                 case RESPST_ERR_LENGTH:
1338                         if (qp_type(qp) == IB_QPT_RC) {
1339                                 /* Class C */
1340                                 do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1341                                                   IB_WC_REM_INV_REQ_ERR);
1342                                 state = RESPST_COMPLETE;
1343                         } else if (qp->srq) {
1344                                 /* UC/UD - class E */
1345                                 qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1346                                 state = RESPST_COMPLETE;
1347                         } else {
1348                                 /* UC/UD - class D */
1349                                 qp->resp.drop_msg = 1;
1350                                 state = RESPST_CLEANUP;
1351                         }
1352                         break;
1353
1354                 case RESPST_ERR_MALFORMED_WQE:
1355                         /* All, Class A. */
1356                         do_class_ac_error(qp, AETH_NAK_REM_OP_ERR,
1357                                           IB_WC_LOC_QP_OP_ERR);
1358                         state = RESPST_COMPLETE;
1359                         break;
1360
1361                 case RESPST_ERR_CQ_OVERFLOW:
1362                         /* All - Class G */
1363                         state = RESPST_ERROR;
1364                         break;
1365
1366                 case RESPST_DONE:
1367                         if (qp->resp.goto_error) {
1368                                 state = RESPST_ERROR;
1369                                 break;
1370                         }
1371
1372                         goto done;
1373
1374                 case RESPST_EXIT:
1375                         if (qp->resp.goto_error) {
1376                                 state = RESPST_ERROR;
1377                                 break;
1378                         }
1379
1380                         goto exit;
1381
1382                 case RESPST_RESET:
1383                         rxe_drain_req_pkts(qp, false);
1384                         qp->resp.wqe = NULL;
1385                         goto exit;
1386
1387                 case RESPST_ERROR:
1388                         qp->resp.goto_error = 0;
1389                         pr_warn("qp#%d moved to error state\n", qp_num(qp));
1390                         rxe_qp_error(qp);
1391                         goto exit;
1392
1393                 default:
1394                         WARN_ON_ONCE(1);
1395                 }
1396         }
1397
1398 exit:
1399         ret = -EAGAIN;
1400 done:
1401         rxe_drop_ref(qp);
1402         return ret;
1403 }