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_dev *rxe, struct rxe_qp *qp,
 108                         struct sk_buff *skb)
 109 {
 110         int must_sched;
 111         struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
 112
 113         skb_queue_tail(&qp->req_pkts, skb);
 114
 115         must_sched = (pkt->opcode == IB_OPCODE_RC_RDMA_READ_REQUEST) ||
 116                         (skb_queue_len(&qp->req_pkts) > 1);
 117
 118         rxe_run_task(&qp->resp.task, must_sched);
 119 }
 120
 121 static inline enum resp_states get_req(struct rxe_qp *qp,
 122                                        struct rxe_pkt_info **pkt_p)
 123 {
 124         struct sk_buff *skb;
 125
 126         if (qp->resp.state == QP_STATE_ERROR) {
 127                 skb = skb_dequeue(&qp->req_pkts);
 128                 if (skb) {
 129                         /* drain request packet queue */
 130                         rxe_drop_ref(qp);
 131                         kfree_skb(skb);
 132                         return RESPST_GET_REQ;
 133                 }
 134
 135                 /* go drain recv wr queue */
 136                 return RESPST_CHK_RESOURCE;
 137         }
 138
 139         skb = skb_peek(&qp->req_pkts);
 140         if (!skb)
 141                 return RESPST_EXIT;
 142
 143         *pkt_p = SKB_TO_PKT(skb);
 144
 145         return (qp->resp.res) ? RESPST_READ_REPLY : RESPST_CHK_PSN;
 146 }
 147
 148 static enum resp_states check_psn(struct rxe_qp *qp,
 149                                   struct rxe_pkt_info *pkt)
 150 {
 151         int diff = psn_compare(pkt->psn, qp->resp.psn);
 152
 153         switch (qp_type(qp)) {
 154         case IB_QPT_RC:
 155                 if (diff > 0) {
 156                         if (qp->resp.sent_psn_nak)
 157                                 return RESPST_CLEANUP;
 158
 159                         qp->resp.sent_psn_nak = 1;
 160                         return RESPST_ERR_PSN_OUT_OF_SEQ;
 161
 162                 } else if (diff < 0) {
 163                         return RESPST_DUPLICATE_REQUEST;
 164                 }
 165
 166                 if (qp->resp.sent_psn_nak)
 167                         qp->resp.sent_psn_nak = 0;
 168
 169                 break;
 170
 171         case IB_QPT_UC:
 172                 if (qp->resp.drop_msg || diff != 0) {
 173                         if (pkt->mask & RXE_START_MASK) {
 174                                 qp->resp.drop_msg = 0;
 175                                 return RESPST_CHK_OP_SEQ;
 176                         }
 177
 178                         qp->resp.drop_msg = 1;
 179                         return RESPST_CLEANUP;
 180                 }
 181                 break;
 182         default:
 183                 break;
 184         }
 185
 186         return RESPST_CHK_OP_SEQ;
 187 }
 188
 189 static enum resp_states check_op_seq(struct rxe_qp *qp,
 190                                      struct rxe_pkt_info *pkt)
 191 {
 192         switch (qp_type(qp)) {
 193         case IB_QPT_RC:
 194                 switch (qp->resp.opcode) {
 195                 case IB_OPCODE_RC_SEND_FIRST:
 196                 case IB_OPCODE_RC_SEND_MIDDLE:
 197                         switch (pkt->opcode) {
 198                         case IB_OPCODE_RC_SEND_MIDDLE:
 199                         case IB_OPCODE_RC_SEND_LAST:
 200                         case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE:
 201                         case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE:
 202                                 return RESPST_CHK_OP_VALID;
 203                         default:
 204                                 return RESPST_ERR_MISSING_OPCODE_LAST_C;
 205                         }
 206
 207                 case IB_OPCODE_RC_RDMA_WRITE_FIRST:
 208                 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
 209                         switch (pkt->opcode) {
 210                         case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
 211                         case IB_OPCODE_RC_RDMA_WRITE_LAST:
 212                         case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
 213                                 return RESPST_CHK_OP_VALID;
 214                         default:
 215                                 return RESPST_ERR_MISSING_OPCODE_LAST_C;
 216                         }
 217
 218                 default:
 219                         switch (pkt->opcode) {
 220                         case IB_OPCODE_RC_SEND_MIDDLE:
 221                         case IB_OPCODE_RC_SEND_LAST:
 222                         case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE:
 223                         case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE:
 224                         case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
 225                         case IB_OPCODE_RC_RDMA_WRITE_LAST:
 226                         case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
 227                                 return RESPST_ERR_MISSING_OPCODE_FIRST;
 228                         default:
 229                                 return RESPST_CHK_OP_VALID;
 230                         }
 231                 }
 232                 break;
 233
 234         case IB_QPT_UC:
 235                 switch (qp->resp.opcode) {
 236                 case IB_OPCODE_UC_SEND_FIRST:
 237                 case IB_OPCODE_UC_SEND_MIDDLE:
 238                         switch (pkt->opcode) {
 239                         case IB_OPCODE_UC_SEND_MIDDLE:
 240                         case IB_OPCODE_UC_SEND_LAST:
 241                         case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE:
 242                                 return RESPST_CHK_OP_VALID;
 243                         default:
 244                                 return RESPST_ERR_MISSING_OPCODE_LAST_D1E;
 245                         }
 246
 247                 case IB_OPCODE_UC_RDMA_WRITE_FIRST:
 248                 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
 249                         switch (pkt->opcode) {
 250                         case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
 251                         case IB_OPCODE_UC_RDMA_WRITE_LAST:
 252                         case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
 253                                 return RESPST_CHK_OP_VALID;
 254                         default:
 255                                 return RESPST_ERR_MISSING_OPCODE_LAST_D1E;
 256                         }
 257
 258                 default:
 259                         switch (pkt->opcode) {
 260                         case IB_OPCODE_UC_SEND_MIDDLE:
 261                         case IB_OPCODE_UC_SEND_LAST:
 262                         case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE:
 263                         case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
 264                         case IB_OPCODE_UC_RDMA_WRITE_LAST:
 265                         case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
 266                                 qp->resp.drop_msg = 1;
 267                                 return RESPST_CLEANUP;
 268                         default:
 269                                 return RESPST_CHK_OP_VALID;
 270                         }
 271                 }
 272                 break;
 273
 274         default:
 275                 return RESPST_CHK_OP_VALID;
 276         }
 277 }
 278
 279 static enum resp_states check_op_valid(struct rxe_qp *qp,
 280                                        struct rxe_pkt_info *pkt)
 281 {
 282         switch (qp_type(qp)) {
 283         case IB_QPT_RC:
 284                 if (((pkt->mask & RXE_READ_MASK) &&
 285                      !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_READ)) ||
 286                     ((pkt->mask & RXE_WRITE_MASK) &&
 287                      !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) ||
 288                     ((pkt->mask & RXE_ATOMIC_MASK) &&
 289                      !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) {
 290                         return RESPST_ERR_UNSUPPORTED_OPCODE;
 291                 }
 292
 293                 break;
 294
 295         case IB_QPT_UC:
 296                 if ((pkt->mask & RXE_WRITE_MASK) &&
 297                     !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) {
 298                         qp->resp.drop_msg = 1;
 299                         return RESPST_CLEANUP;
 300                 }
 301
 302                 break;
 303
 304         case IB_QPT_UD:
 305         case IB_QPT_SMI:
 306         case IB_QPT_GSI:
 307                 break;
 308
 309         default:
 310                 WARN_ON(1);
 311                 break;
 312         }
 313
 314         return RESPST_CHK_RESOURCE;
 315 }
 316
 317 static enum resp_states get_srq_wqe(struct rxe_qp *qp)
 318 {
 319         struct rxe_srq *srq = qp->srq;
 320         struct rxe_queue *q = srq->rq.queue;
 321         struct rxe_recv_wqe *wqe;
 322         struct ib_event ev;
 323
 324         if (srq->error)
 325                 return RESPST_ERR_RNR;
 326
 327         spin_lock_bh(&srq->rq.consumer_lock);
 328
 329         wqe = queue_head(q);
 330         if (!wqe) {
 331                 spin_unlock_bh(&srq->rq.consumer_lock);
 332                 return RESPST_ERR_RNR;
 333         }
 334
 335         /* note kernel and user space recv wqes have same size */
 336         memcpy(&qp->resp.srq_wqe, wqe, sizeof(qp->resp.srq_wqe));
 337
 338         qp->resp.wqe = &qp->resp.srq_wqe.wqe;
 339         advance_consumer(q);
 340
 341         if (srq->limit && srq->ibsrq.event_handler &&
 342             (queue_count(q) < srq->limit)) {
 343                 srq->limit = 0;
 344                 goto event;
 345         }
 346
 347         spin_unlock_bh(&srq->rq.consumer_lock);
 348         return RESPST_CHK_LENGTH;
 349
 350 event:
 351         spin_unlock_bh(&srq->rq.consumer_lock);
 352         ev.device = qp->ibqp.device;
 353         ev.element.srq = qp->ibqp.srq;
 354         ev.event = IB_EVENT_SRQ_LIMIT_REACHED;
 355         srq->ibsrq.event_handler(&ev, srq->ibsrq.srq_context);
 356         return RESPST_CHK_LENGTH;
 357 }
 358
 359 static enum resp_states check_resource(struct rxe_qp *qp,
 360                                        struct rxe_pkt_info *pkt)
 361 {
 362         struct rxe_srq *srq = qp->srq;
 363
 364         if (qp->resp.state == QP_STATE_ERROR) {
 365                 if (qp->resp.wqe) {
 366                         qp->resp.status = IB_WC_WR_FLUSH_ERR;
 367                         return RESPST_COMPLETE;
 368                 } else if (!srq) {
 369                         qp->resp.wqe = queue_head(qp->rq.queue);
 370                         if (qp->resp.wqe) {
 371                                 qp->resp.status = IB_WC_WR_FLUSH_ERR;
 372                                 return RESPST_COMPLETE;
 373                         } else {
 374                                 return RESPST_EXIT;
 375                         }
 376                 } else {
 377                         return RESPST_EXIT;
 378                 }
 379         }
 380
 381         if (pkt->mask & RXE_READ_OR_ATOMIC) {
 382                 /* it is the requesters job to not send
 383                  * too many read/atomic ops, we just
 384                  * recycle the responder resource queue
 385                  */
 386                 if (likely(qp->attr.max_dest_rd_atomic > 0))
 387                         return RESPST_CHK_LENGTH;
 388                 else
 389                         return RESPST_ERR_TOO_MANY_RDMA_ATM_REQ;
 390         }
 391
 392         if (pkt->mask & RXE_RWR_MASK) {
 393                 if (srq)
 394                         return get_srq_wqe(qp);
 395
 396                 qp->resp.wqe = queue_head(qp->rq.queue);
 397                 return (qp->resp.wqe) ? RESPST_CHK_LENGTH : RESPST_ERR_RNR;
 398         }
 399
 400         return RESPST_CHK_LENGTH;
 401 }
 402
 403 static enum resp_states check_length(struct rxe_qp *qp,
 404                                      struct rxe_pkt_info *pkt)
 405 {
 406         switch (qp_type(qp)) {
 407         case IB_QPT_RC:
 408                 return RESPST_CHK_RKEY;
 409
 410         case IB_QPT_UC:
 411                 return RESPST_CHK_RKEY;
 412
 413         default:
 414                 return RESPST_CHK_RKEY;
 415         }
 416 }
 417
 418 static enum resp_states check_rkey(struct rxe_qp *qp,
 419                                    struct rxe_pkt_info *pkt)
 420 {
 421         struct rxe_mem *mem = NULL;
 422         u64 va;
 423         u32 rkey;
 424         u32 resid;
 425         u32 pktlen;
 426         int mtu = qp->mtu;
 427         enum resp_states state;
 428         int access;
 429
 430         if (pkt->mask & (RXE_READ_MASK | RXE_WRITE_MASK)) {
 431                 if (pkt->mask & RXE_RETH_MASK) {
 432                         qp->resp.va = reth_va(pkt);
 433                         qp->resp.rkey = reth_rkey(pkt);
 434                         qp->resp.resid = reth_len(pkt);
 435                         qp->resp.length = reth_len(pkt);
 436                 }
 437                 access = (pkt->mask & RXE_READ_MASK) ? IB_ACCESS_REMOTE_READ
 438                                                      : IB_ACCESS_REMOTE_WRITE;
 439         } else if (pkt->mask & RXE_ATOMIC_MASK) {
 440                 qp->resp.va = atmeth_va(pkt);
 441                 qp->resp.rkey = atmeth_rkey(pkt);
 442                 qp->resp.resid = sizeof(u64);
 443                 access = IB_ACCESS_REMOTE_ATOMIC;
 444         } else {
 445                 return RESPST_EXECUTE;
 446         }
 447
 448         va      = qp->resp.va;
 449         rkey    = qp->resp.rkey;
 450         resid   = qp->resp.resid;
 451         pktlen  = payload_size(pkt);
 452
 453         mem = lookup_mem(qp->pd, access, rkey, lookup_remote);
 454         if (!mem) {
 455                 state = RESPST_ERR_RKEY_VIOLATION;
 456                 goto err;
 457         }
 458
 459         if (unlikely(mem->state == RXE_MEM_STATE_FREE)) {
 460                 state = RESPST_ERR_RKEY_VIOLATION;
 461                 goto err;
 462         }
 463
 464         if (mem_check_range(mem, va, resid)) {
 465                 state = RESPST_ERR_RKEY_VIOLATION;
 466                 goto err;
 467         }
 468
 469         if (pkt->mask & RXE_WRITE_MASK)  {
 470                 if (resid > mtu) {
 471                         if (pktlen != mtu || bth_pad(pkt)) {
 472                                 state = RESPST_ERR_LENGTH;
 473                                 goto err;
 474                         }
 475                 } else {
 476                         if (pktlen != resid) {
 477                                 state = RESPST_ERR_LENGTH;
 478                                 goto err;
 479                         }
 480                         if ((bth_pad(pkt) != (0x3 & (-resid)))) {
 481                                 /* This case may not be exactly that
 482                                  * but nothing else fits.
 483                                  */
 484                                 state = RESPST_ERR_LENGTH;
 485                                 goto err;
 486                         }
 487                 }
 488         }
 489
 490         WARN_ON(qp->resp.mr);
 491
 492         qp->resp.mr = mem;
 493         return RESPST_EXECUTE;
 494
 495 err:
 496         if (mem)
 497                 rxe_drop_ref(mem);
 498         return state;
 499 }
 500
 501 static enum resp_states send_data_in(struct rxe_qp *qp, void *data_addr,
 502                                      int data_len)
 503 {
 504         int err;
 505         struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
 506
 507         err = copy_data(rxe, qp->pd, IB_ACCESS_LOCAL_WRITE, &qp->resp.wqe->dma,
 508                         data_addr, data_len, to_mem_obj, NULL);
 509         if (unlikely(err))
 510                 return (err == -ENOSPC) ? RESPST_ERR_LENGTH
 511                                         : RESPST_ERR_MALFORMED_WQE;
 512
 513         return RESPST_NONE;
 514 }
 515
 516 static enum resp_states write_data_in(struct rxe_qp *qp,
 517                                       struct rxe_pkt_info *pkt)
 518 {
 519         enum resp_states rc = RESPST_NONE;
 520         int     err;
 521         int data_len = payload_size(pkt);
 522
 523         err = rxe_mem_copy(qp->resp.mr, qp->resp.va, payload_addr(pkt),
 524                            data_len, to_mem_obj, NULL);
 525         if (err) {
 526                 rc = RESPST_ERR_RKEY_VIOLATION;
 527                 goto out;
 528         }
 529
 530         qp->resp.va += data_len;
 531         qp->resp.resid -= data_len;
 532
 533 out:
 534         return rc;
 535 }
 536
 537 /* Guarantee atomicity of atomic operations at the machine level. */
 538 static DEFINE_SPINLOCK(atomic_ops_lock);
 539
 540 static enum resp_states process_atomic(struct rxe_qp *qp,
 541                                        struct rxe_pkt_info *pkt)
 542 {
 543         u64 iova = atmeth_va(pkt);
 544         u64 *vaddr;
 545         enum resp_states ret;
 546         struct rxe_mem *mr = qp->resp.mr;
 547
 548         if (mr->state != RXE_MEM_STATE_VALID) {
 549                 ret = RESPST_ERR_RKEY_VIOLATION;
 550                 goto out;
 551         }
 552
 553         vaddr = iova_to_vaddr(mr, iova, sizeof(u64));
 554
 555         /* check vaddr is 8 bytes aligned. */
 556         if (!vaddr || (uintptr_t)vaddr & 7) {
 557                 ret = RESPST_ERR_MISALIGNED_ATOMIC;
 558                 goto out;
 559         }
 560
 561         spin_lock_bh(&atomic_ops_lock);
 562
 563         qp->resp.atomic_orig = *vaddr;
 564
 565         if (pkt->opcode == IB_OPCODE_RC_COMPARE_SWAP ||
 566             pkt->opcode == IB_OPCODE_RD_COMPARE_SWAP) {
 567                 if (*vaddr == atmeth_comp(pkt))
 568                         *vaddr = atmeth_swap_add(pkt);
 569         } else {
 570                 *vaddr += atmeth_swap_add(pkt);
 571         }
 572
 573         spin_unlock_bh(&atomic_ops_lock);
 574
 575         ret = RESPST_NONE;
 576 out:
 577         return ret;
 578 }
 579
 580 static struct sk_buff *prepare_ack_packet(struct rxe_qp *qp,
 581                                           struct rxe_pkt_info *pkt,
 582                                           struct rxe_pkt_info *ack,
 583                                           int opcode,
 584                                           int payload,
 585                                           u32 psn,
 586                                           u8 syndrome,
 587                                           u32 *crcp)
 588 {
 589         struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
 590         struct sk_buff *skb;
 591         u32 crc = 0;
 592         u32 *p;
 593         int paylen;
 594         int pad;
 595         int err;
 596
 597         /*
 598          * allocate packet
 599          */
 600         pad = (-payload) & 0x3;
 601         paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE;
 602
 603         skb = rxe_init_packet(rxe, &qp->pri_av, paylen, ack);
 604         if (!skb)
 605                 return NULL;
 606
 607         ack->qp = qp;
 608         ack->opcode = opcode;
 609         ack->mask = rxe_opcode[opcode].mask;
 610         ack->offset = pkt->offset;
 611         ack->paylen = paylen;
 612
 613         /* fill in bth using the request packet headers */
 614         memcpy(ack->hdr, pkt->hdr, pkt->offset + RXE_BTH_BYTES);
 615
 616         bth_set_opcode(ack, opcode);
 617         bth_set_qpn(ack, qp->attr.dest_qp_num);
 618         bth_set_pad(ack, pad);
 619         bth_set_se(ack, 0);
 620         bth_set_psn(ack, psn);
 621         bth_set_ack(ack, 0);
 622         ack->psn = psn;
 623
 624         if (ack->mask & RXE_AETH_MASK) {
 625                 aeth_set_syn(ack, syndrome);
 626                 aeth_set_msn(ack, qp->resp.msn);
 627         }
 628
 629         if (ack->mask & RXE_ATMACK_MASK)
 630                 atmack_set_orig(ack, qp->resp.atomic_orig);
 631
 632         err = rxe_prepare(rxe, ack, skb, &crc);
 633         if (err) {
 634                 kfree_skb(skb);
 635                 return NULL;
 636         }
 637
 638         if (crcp) {
 639                 /* CRC computation will be continued by the caller */
 640                 *crcp = crc;
 641         } else {
 642                 p = payload_addr(ack) + payload + bth_pad(ack);
 643                 *p = ~crc;
 644         }
 645
 646         return skb;
 647 }
 648
 649 /* RDMA read response. If res is not NULL, then we have a current RDMA request
 650  * being processed or replayed.
 651  */
 652 static enum resp_states read_reply(struct rxe_qp *qp,
 653                                    struct rxe_pkt_info *req_pkt)
 654 {
 655         struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
 656         struct rxe_pkt_info ack_pkt;
 657         struct sk_buff *skb;
 658         int mtu = qp->mtu;
 659         enum resp_states state;
 660         int payload;
 661         int opcode;
 662         int err;
 663         struct resp_res *res = qp->resp.res;
 664         u32 icrc;
 665         u32 *p;
 666
 667         if (!res) {
 668                 /* This is the first time we process that request. Get a
 669                  * resource
 670                  */
 671                 res = &qp->resp.resources[qp->resp.res_head];
 672
 673                 free_rd_atomic_resource(qp, res);
 674                 rxe_advance_resp_resource(qp);
 675
 676                 res->type               = RXE_READ_MASK;
 677
 678                 res->read.va            = qp->resp.va;
 679                 res->read.va_org        = qp->resp.va;
 680
 681                 res->first_psn          = req_pkt->psn;
 682                 res->last_psn           = req_pkt->psn +
 683                                           (reth_len(req_pkt) + mtu - 1) /
 684                                           mtu - 1;
 685                 res->cur_psn            = req_pkt->psn;
 686
 687                 res->read.resid         = qp->resp.resid;
 688                 res->read.length        = qp->resp.resid;
 689                 res->read.rkey          = qp->resp.rkey;
 690
 691                 /* note res inherits the reference to mr from qp */
 692                 res->read.mr            = qp->resp.mr;
 693                 qp->resp.mr             = NULL;
 694
 695                 qp->resp.res            = res;
 696                 res->state              = rdatm_res_state_new;
 697         }
 698
 699         if (res->state == rdatm_res_state_new) {
 700                 if (res->read.resid <= mtu)
 701                         opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_ONLY;
 702                 else
 703                         opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST;
 704         } else {
 705                 if (res->read.resid > mtu)
 706                         opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE;
 707                 else
 708                         opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_LAST;
 709         }
 710
 711         res->state = rdatm_res_state_next;
 712
 713         payload = min_t(int, res->read.resid, mtu);
 714
 715         skb = prepare_ack_packet(qp, req_pkt, &ack_pkt, opcode, payload,
 716                                  res->cur_psn, AETH_ACK_UNLIMITED, &icrc);
 717         if (!skb)
 718                 return RESPST_ERR_RNR;
 719
 720         err = rxe_mem_copy(res->read.mr, res->read.va, payload_addr(&ack_pkt),
 721                            payload, from_mem_obj, &icrc);
 722         if (err)
 723                 pr_err("Failed copying memory\n");
 724
 725         p = payload_addr(&ack_pkt) + payload + bth_pad(&ack_pkt);
 726         *p = ~icrc;
 727
 728         err = rxe_xmit_packet(rxe, qp, &ack_pkt, skb);
 729         if (err) {
 730                 pr_err("Failed sending RDMA reply.\n");
 731                 kfree_skb(skb);
 732                 return RESPST_ERR_RNR;
 733         }
 734
 735         res->read.va += payload;
 736         res->read.resid -= payload;
 737         res->cur_psn = (res->cur_psn + 1) & BTH_PSN_MASK;
 738
 739         if (res->read.resid > 0) {
 740                 state = RESPST_DONE;
 741         } else {
 742                 qp->resp.res = NULL;
 743                 qp->resp.opcode = -1;
 744                 qp->resp.psn = res->cur_psn;
 745                 state = RESPST_CLEANUP;
 746         }
 747
 748         return state;
 749 }
 750
 751 static void build_rdma_network_hdr(union rdma_network_hdr *hdr,
 752                                    struct rxe_pkt_info *pkt)
 753 {
 754         struct sk_buff *skb = PKT_TO_SKB(pkt);
 755
 756         memset(hdr, 0, sizeof(*hdr));
 757         if (skb->protocol == htons(ETH_P_IP))
 758                 memcpy(&hdr->roce4grh, ip_hdr(skb), sizeof(hdr->roce4grh));
 759         else if (skb->protocol == htons(ETH_P_IPV6))
 760                 memcpy(&hdr->ibgrh, ipv6_hdr(skb), sizeof(hdr->ibgrh));
 761 }
 762
 763 /* Executes a new request. A retried request never reach that function (send
 764  * and writes are discarded, and reads and atomics are retried elsewhere.
 765  */
 766 static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt)
 767 {
 768         enum resp_states err;
 769
 770         if (pkt->mask & RXE_SEND_MASK) {
 771                 if (qp_type(qp) == IB_QPT_UD ||
 772                     qp_type(qp) == IB_QPT_SMI ||
 773                     qp_type(qp) == IB_QPT_GSI) {
 774                         union rdma_network_hdr hdr;
 775
 776                         build_rdma_network_hdr(&hdr, pkt);
 777
 778                         err = send_data_in(qp, &hdr, sizeof(hdr));
 779                         if (err)
 780                                 return err;
 781                 }
 782                 err = send_data_in(qp, payload_addr(pkt), payload_size(pkt));
 783                 if (err)
 784                         return err;
 785         } else if (pkt->mask & RXE_WRITE_MASK) {
 786                 err = write_data_in(qp, pkt);
 787                 if (err)
 788                         return err;
 789         } else if (pkt->mask & RXE_READ_MASK) {
 790                 /* For RDMA Read we can increment the msn now. See C9-148. */
 791                 qp->resp.msn++;
 792                 return RESPST_READ_REPLY;
 793         } else if (pkt->mask & RXE_ATOMIC_MASK) {
 794                 err = process_atomic(qp, pkt);
 795                 if (err)
 796                         return err;
 797         } else
 798                 /* Unreachable */
 799                 WARN_ON(1);
 800
 801         /* next expected psn, read handles this separately */
 802         qp->resp.psn = (pkt->psn + 1) & BTH_PSN_MASK;
 803
 804         qp->resp.opcode = pkt->opcode;
 805         qp->resp.status = IB_WC_SUCCESS;
 806
 807         if (pkt->mask & RXE_COMP_MASK) {
 808                 /* We successfully processed this new request. */
 809                 qp->resp.msn++;
 810                 return RESPST_COMPLETE;
 811         } else if (qp_type(qp) == IB_QPT_RC)
 812                 return RESPST_ACKNOWLEDGE;
 813         else
 814                 return RESPST_CLEANUP;
 815 }
 816
 817 static enum resp_states do_complete(struct rxe_qp *qp,
 818                                     struct rxe_pkt_info *pkt)
 819 {
 820         struct rxe_cqe cqe;
 821         struct ib_wc *wc = &cqe.ibwc;
 822         struct ib_uverbs_wc *uwc = &cqe.uibwc;
 823         struct rxe_recv_wqe *wqe = qp->resp.wqe;
 824
 825         if (unlikely(!wqe))
 826                 return RESPST_CLEANUP;
 827
 828         memset(&cqe, 0, sizeof(cqe));
 829
 830         if (qp->rcq->is_user) {
 831                 uwc->status             = qp->resp.status;
 832                 uwc->qp_num             = qp->ibqp.qp_num;
 833                 uwc->wr_id              = wqe->wr_id;
 834         } else {
 835                 wc->status              = qp->resp.status;
 836                 wc->qp                  = &qp->ibqp;
 837                 wc->wr_id               = wqe->wr_id;
 838         }
 839
 840         if (wc->status == IB_WC_SUCCESS) {
 841                 wc->opcode = (pkt->mask & RXE_IMMDT_MASK &&
 842                                 pkt->mask & RXE_WRITE_MASK) ?
 843                                         IB_WC_RECV_RDMA_WITH_IMM : IB_WC_RECV;
 844                 wc->vendor_err = 0;
 845                 wc->byte_len = (pkt->mask & RXE_IMMDT_MASK &&
 846                                 pkt->mask & RXE_WRITE_MASK) ?
 847                                         qp->resp.length : wqe->dma.length - wqe->dma.resid;
 848
 849                 /* fields after byte_len are different between kernel and user
 850                  * space
 851                  */
 852                 if (qp->rcq->is_user) {
 853                         uwc->wc_flags = IB_WC_GRH;
 854
 855                         if (pkt->mask & RXE_IMMDT_MASK) {
 856                                 uwc->wc_flags |= IB_WC_WITH_IMM;
 857                                 uwc->ex.imm_data =
 858                                         (__u32 __force)immdt_imm(pkt);
 859                         }
 860
 861                         if (pkt->mask & RXE_IETH_MASK) {
 862                                 uwc->wc_flags |= IB_WC_WITH_INVALIDATE;
 863                                 uwc->ex.invalidate_rkey = ieth_rkey(pkt);
 864                         }
 865
 866                         uwc->qp_num             = qp->ibqp.qp_num;
 867
 868                         if (pkt->mask & RXE_DETH_MASK)
 869                                 uwc->src_qp = deth_sqp(pkt);
 870
 871                         uwc->port_num           = qp->attr.port_num;
 872                 } else {
 873                         struct sk_buff *skb = PKT_TO_SKB(pkt);
 874
 875                         wc->wc_flags = IB_WC_GRH | IB_WC_WITH_NETWORK_HDR_TYPE;
 876                         if (skb->protocol == htons(ETH_P_IP))
 877                                 wc->network_hdr_type = RDMA_NETWORK_IPV4;
 878                         else
 879                                 wc->network_hdr_type = RDMA_NETWORK_IPV6;
 880
 881                         if (pkt->mask & RXE_IMMDT_MASK) {
 882                                 wc->wc_flags |= IB_WC_WITH_IMM;
 883                                 wc->ex.imm_data = immdt_imm(pkt);
 884                         }
 885
 886                         if (pkt->mask & RXE_IETH_MASK) {
 887                                 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
 888                                 struct rxe_mem *rmr;
 889
 890                                 wc->wc_flags |= IB_WC_WITH_INVALIDATE;
 891                                 wc->ex.invalidate_rkey = ieth_rkey(pkt);
 892
 893                                 rmr = rxe_pool_get_index(&rxe->mr_pool,
 894                                                          wc->ex.invalidate_rkey >> 8);
 895                                 if (unlikely(!rmr)) {
 896                                         pr_err("Bad rkey %#x invalidation\n",
 897                                                wc->ex.invalidate_rkey);
 898                                         return RESPST_ERROR;
 899                                 }
 900                                 rmr->state = RXE_MEM_STATE_FREE;
 901                                 rxe_drop_ref(rmr);
 902                         }
 903
 904                         wc->qp                  = &qp->ibqp;
 905
 906                         if (pkt->mask & RXE_DETH_MASK)
 907                                 wc->src_qp = deth_sqp(pkt);
 908
 909                         wc->port_num            = qp->attr.port_num;
 910                 }
 911         }
 912
 913         /* have copy for srq and reference for !srq */
 914         if (!qp->srq)
 915                 advance_consumer(qp->rq.queue);
 916
 917         qp->resp.wqe = NULL;
 918
 919         if (rxe_cq_post(qp->rcq, &cqe, pkt ? bth_se(pkt) : 1))
 920                 return RESPST_ERR_CQ_OVERFLOW;
 921
 922         if (qp->resp.state == QP_STATE_ERROR)
 923                 return RESPST_CHK_RESOURCE;
 924
 925         if (!pkt)
 926                 return RESPST_DONE;
 927         else if (qp_type(qp) == IB_QPT_RC)
 928                 return RESPST_ACKNOWLEDGE;
 929         else
 930                 return RESPST_CLEANUP;
 931 }
 932
 933 static int send_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
 934                     u8 syndrome, u32 psn)
 935 {
 936         int err = 0;
 937         struct rxe_pkt_info ack_pkt;
 938         struct sk_buff *skb;
 939         struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
 940
 941         skb = prepare_ack_packet(qp, pkt, &ack_pkt, IB_OPCODE_RC_ACKNOWLEDGE,
 942                                  0, psn, syndrome, NULL);
 943         if (!skb) {
 944                 err = -ENOMEM;
 945                 goto err1;
 946         }
 947
 948         err = rxe_xmit_packet(rxe, qp, &ack_pkt, skb);
 949         if (err) {
 950                 pr_err_ratelimited("Failed sending ack\n");
 951                 kfree_skb(skb);
 952         }
 953
 954 err1:
 955         return err;
 956 }
 957
 958 static int send_atomic_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
 959                            u8 syndrome)
 960 {
 961         int rc = 0;
 962         struct rxe_pkt_info ack_pkt;
 963         struct sk_buff *skb;
 964         struct sk_buff *skb_copy;
 965         struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
 966         struct resp_res *res;
 967
 968         skb = prepare_ack_packet(qp, pkt, &ack_pkt,
 969                                  IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE, 0, pkt->psn,
 970                                  syndrome, NULL);
 971         if (!skb) {
 972                 rc = -ENOMEM;
 973                 goto out;
 974         }
 975
 976         skb_copy = skb_clone(skb, GFP_ATOMIC);
 977         if (skb_copy)
 978                 rxe_add_ref(qp); /* for the new SKB */
 979         else {
 980                 pr_warn("Could not clone atomic response\n");
 981                 rc = -ENOMEM;
 982                 goto out;
 983         }
 984
 985         res = &qp->resp.resources[qp->resp.res_head];
 986         free_rd_atomic_resource(qp, res);
 987         rxe_advance_resp_resource(qp);
 988
 989         memcpy(SKB_TO_PKT(skb), &ack_pkt, sizeof(ack_pkt));
 990         memset((unsigned char *)SKB_TO_PKT(skb) + sizeof(ack_pkt), 0,
 991                sizeof(skb->cb) - sizeof(ack_pkt));
 992
 993         res->type = RXE_ATOMIC_MASK;
 994         res->atomic.skb = skb;
 995         res->first_psn = ack_pkt.psn;
 996         res->last_psn  = ack_pkt.psn;
 997         res->cur_psn   = ack_pkt.psn;
 998
 999         rc = rxe_xmit_packet(rxe, qp, &ack_pkt, skb_copy);
1000         if (rc) {
1001                 pr_err_ratelimited("Failed sending ack\n");
1002                 rxe_drop_ref(qp);
1003                 kfree_skb(skb_copy);
1004         }
1005
1006 out:
1007         return rc;
1008 }
1009
1010 static enum resp_states acknowledge(struct rxe_qp *qp,
1011                                     struct rxe_pkt_info *pkt)
1012 {
1013         if (qp_type(qp) != IB_QPT_RC)
1014                 return RESPST_CLEANUP;
1015
1016         if (qp->resp.aeth_syndrome != AETH_ACK_UNLIMITED)
1017                 send_ack(qp, pkt, qp->resp.aeth_syndrome, pkt->psn);
1018         else if (pkt->mask & RXE_ATOMIC_MASK)
1019                 send_atomic_ack(qp, pkt, AETH_ACK_UNLIMITED);
1020         else if (bth_ack(pkt))
1021                 send_ack(qp, pkt, AETH_ACK_UNLIMITED, pkt->psn);
1022
1023         return RESPST_CLEANUP;
1024 }
1025
1026 static enum resp_states cleanup(struct rxe_qp *qp,
1027                                 struct rxe_pkt_info *pkt)
1028 {
1029         struct sk_buff *skb;
1030
1031         if (pkt) {
1032                 skb = skb_dequeue(&qp->req_pkts);
1033                 rxe_drop_ref(qp);
1034                 kfree_skb(skb);
1035         }
1036
1037         if (qp->resp.mr) {
1038                 rxe_drop_ref(qp->resp.mr);
1039                 qp->resp.mr = NULL;
1040         }
1041
1042         return RESPST_DONE;
1043 }
1044
1045 static struct resp_res *find_resource(struct rxe_qp *qp, u32 psn)
1046 {
1047         int i;
1048
1049         for (i = 0; i < qp->attr.max_rd_atomic; i++) {
1050                 struct resp_res *res = &qp->resp.resources[i];
1051
1052                 if (res->type == 0)
1053                         continue;
1054
1055                 if (psn_compare(psn, res->first_psn) >= 0 &&
1056                     psn_compare(psn, res->last_psn) <= 0) {
1057                         return res;
1058                 }
1059         }
1060
1061         return NULL;
1062 }
1063
1064 static enum resp_states duplicate_request(struct rxe_qp *qp,
1065                                           struct rxe_pkt_info *pkt)
1066 {
1067         enum resp_states rc;
1068
1069         if (pkt->mask & RXE_SEND_MASK ||
1070             pkt->mask & RXE_WRITE_MASK) {
1071                 /* SEND. Ack again and cleanup. C9-105. */
1072                 if (bth_ack(pkt))
1073                         send_ack(qp, pkt, AETH_ACK_UNLIMITED, qp->resp.psn - 1);
1074                 rc = RESPST_CLEANUP;
1075                 goto out;
1076         } else if (pkt->mask & RXE_READ_MASK) {
1077                 struct resp_res *res;
1078
1079                 res = find_resource(qp, pkt->psn);
1080                 if (!res) {
1081                         /* Resource not found. Class D error.  Drop the
1082                          * request.
1083                          */
1084                         rc = RESPST_CLEANUP;
1085                         goto out;
1086                 } else {
1087                         /* Ensure this new request is the same as the previous
1088                          * one or a subset of it.
1089                          */
1090                         u64 iova = reth_va(pkt);
1091                         u32 resid = reth_len(pkt);
1092
1093                         if (iova < res->read.va_org ||
1094                             resid > res->read.length ||
1095                             (iova + resid) > (res->read.va_org +
1096                                               res->read.length)) {
1097                                 rc = RESPST_CLEANUP;
1098                                 goto out;
1099                         }
1100
1101                         if (reth_rkey(pkt) != res->read.rkey) {
1102                                 rc = RESPST_CLEANUP;
1103                                 goto out;
1104                         }
1105
1106                         res->cur_psn = pkt->psn;
1107                         res->state = (pkt->psn == res->first_psn) ?
1108                                         rdatm_res_state_new :
1109                                         rdatm_res_state_replay;
1110
1111                         /* Reset the resource, except length. */
1112                         res->read.va_org = iova;
1113                         res->read.va = iova;
1114                         res->read.resid = resid;
1115
1116                         /* Replay the RDMA read reply. */
1117                         qp->resp.res = res;
1118                         rc = RESPST_READ_REPLY;
1119                         goto out;
1120                 }
1121         } else {
1122                 struct resp_res *res;
1123
1124                 /* Find the operation in our list of responder resources. */
1125                 res = find_resource(qp, pkt->psn);
1126                 if (res) {
1127                         struct sk_buff *skb_copy;
1128
1129                         skb_copy = skb_clone(res->atomic.skb, GFP_ATOMIC);
1130                         if (skb_copy) {
1131                                 rxe_add_ref(qp); /* for the new SKB */
1132                         } else {
1133                                 pr_warn("Couldn't clone atomic resp\n");
1134                                 rc = RESPST_CLEANUP;
1135                                 goto out;
1136                         }
1137
1138                         /* Resend the result. */
1139                         rc = rxe_xmit_packet(to_rdev(qp->ibqp.device), qp,
1140                                              pkt, skb_copy);
1141                         if (rc) {
1142                                 pr_err("Failed resending result. This flow is not handled - skb ignored\n");
1143                                 kfree_skb(skb_copy);
1144                                 rc = RESPST_CLEANUP;
1145                                 goto out;
1146                         }
1147                 }
1148
1149                 /* Resource not found. Class D error. Drop the request. */
1150                 rc = RESPST_CLEANUP;
1151                 goto out;
1152         }
1153 out:
1154         return rc;
1155 }
1156
1157 /* Process a class A or C. Both are treated the same in this implementation. */
1158 static void do_class_ac_error(struct rxe_qp *qp, u8 syndrome,
1159                               enum ib_wc_status status)
1160 {
1161         qp->resp.aeth_syndrome  = syndrome;
1162         qp->resp.status         = status;
1163
1164         /* indicate that we should go through the ERROR state */
1165         qp->resp.goto_error     = 1;
1166 }
1167
1168 static enum resp_states do_class_d1e_error(struct rxe_qp *qp)
1169 {
1170         /* UC */
1171         if (qp->srq) {
1172                 /* Class E */
1173                 qp->resp.drop_msg = 1;
1174                 if (qp->resp.wqe) {
1175                         qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1176                         return RESPST_COMPLETE;
1177                 } else {
1178                         return RESPST_CLEANUP;
1179                 }
1180         } else {
1181                 /* Class D1. This packet may be the start of a
1182                  * new message and could be valid. The previous
1183                  * message is invalid and ignored. reset the
1184                  * recv wr to its original state
1185                  */
1186                 if (qp->resp.wqe) {
1187                         qp->resp.wqe->dma.resid = qp->resp.wqe->dma.length;
1188                         qp->resp.wqe->dma.cur_sge = 0;
1189                         qp->resp.wqe->dma.sge_offset = 0;
1190                         qp->resp.opcode = -1;
1191                 }
1192
1193                 if (qp->resp.mr) {
1194                         rxe_drop_ref(qp->resp.mr);
1195                         qp->resp.mr = NULL;
1196                 }
1197
1198                 return RESPST_CLEANUP;
1199         }
1200 }
1201
1202 int rxe_responder(void *arg)
1203 {
1204         struct rxe_qp *qp = (struct rxe_qp *)arg;
1205         enum resp_states state;
1206         struct rxe_pkt_info *pkt = NULL;
1207         int ret = 0;
1208
1209         qp->resp.aeth_syndrome = AETH_ACK_UNLIMITED;
1210
1211         if (!qp->valid) {
1212                 ret = -EINVAL;
1213                 goto done;
1214         }
1215
1216         switch (qp->resp.state) {
1217         case QP_STATE_RESET:
1218                 state = RESPST_RESET;
1219                 break;
1220
1221         default:
1222                 state = RESPST_GET_REQ;
1223                 break;
1224         }
1225
1226         while (1) {
1227                 pr_debug("qp#%d state = %s\n", qp_num(qp),
1228                          resp_state_name[state]);
1229                 switch (state) {
1230                 case RESPST_GET_REQ:
1231                         state = get_req(qp, &pkt);
1232                         break;
1233                 case RESPST_CHK_PSN:
1234                         state = check_psn(qp, pkt);
1235                         break;
1236                 case RESPST_CHK_OP_SEQ:
1237                         state = check_op_seq(qp, pkt);
1238                         break;
1239                 case RESPST_CHK_OP_VALID:
1240                         state = check_op_valid(qp, pkt);
1241                         break;
1242                 case RESPST_CHK_RESOURCE:
1243                         state = check_resource(qp, pkt);
1244                         break;
1245                 case RESPST_CHK_LENGTH:
1246                         state = check_length(qp, pkt);
1247                         break;
1248                 case RESPST_CHK_RKEY:
1249                         state = check_rkey(qp, pkt);
1250                         break;
1251                 case RESPST_EXECUTE:
1252                         state = execute(qp, pkt);
1253                         break;
1254                 case RESPST_COMPLETE:
1255                         state = do_complete(qp, pkt);
1256                         break;
1257                 case RESPST_READ_REPLY:
1258                         state = read_reply(qp, pkt);
1259                         break;
1260                 case RESPST_ACKNOWLEDGE:
1261                         state = acknowledge(qp, pkt);
1262                         break;
1263                 case RESPST_CLEANUP:
1264                         state = cleanup(qp, pkt);
1265                         break;
1266                 case RESPST_DUPLICATE_REQUEST:
1267                         state = duplicate_request(qp, pkt);
1268                         break;
1269                 case RESPST_ERR_PSN_OUT_OF_SEQ:
1270                         /* RC only - Class B. Drop packet. */
1271                         send_ack(qp, pkt, AETH_NAK_PSN_SEQ_ERROR, qp->resp.psn);
1272                         state = RESPST_CLEANUP;
1273                         break;
1274
1275                 case RESPST_ERR_TOO_MANY_RDMA_ATM_REQ:
1276                 case RESPST_ERR_MISSING_OPCODE_FIRST:
1277                 case RESPST_ERR_MISSING_OPCODE_LAST_C:
1278                 case RESPST_ERR_UNSUPPORTED_OPCODE:
1279                 case RESPST_ERR_MISALIGNED_ATOMIC:
1280                         /* RC Only - Class C. */
1281                         do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1282                                           IB_WC_REM_INV_REQ_ERR);
1283                         state = RESPST_COMPLETE;
1284                         break;
1285
1286                 case RESPST_ERR_MISSING_OPCODE_LAST_D1E:
1287                         state = do_class_d1e_error(qp);
1288                         break;
1289                 case RESPST_ERR_RNR:
1290                         if (qp_type(qp) == IB_QPT_RC) {
1291                                 /* RC - class B */
1292                                 send_ack(qp, pkt, AETH_RNR_NAK |
1293                                          (~AETH_TYPE_MASK &
1294                                          qp->attr.min_rnr_timer),
1295                                          pkt->psn);
1296                         } else {
1297                                 /* UD/UC - class D */
1298                                 qp->resp.drop_msg = 1;
1299                         }
1300                         state = RESPST_CLEANUP;
1301                         break;
1302
1303                 case RESPST_ERR_RKEY_VIOLATION:
1304                         if (qp_type(qp) == IB_QPT_RC) {
1305                                 /* Class C */
1306                                 do_class_ac_error(qp, AETH_NAK_REM_ACC_ERR,
1307                                                   IB_WC_REM_ACCESS_ERR);
1308                                 state = RESPST_COMPLETE;
1309                         } else {
1310                                 qp->resp.drop_msg = 1;
1311                                 if (qp->srq) {
1312                                         /* UC/SRQ Class D */
1313                                         qp->resp.status = IB_WC_REM_ACCESS_ERR;
1314                                         state = RESPST_COMPLETE;
1315                                 } else {
1316                                         /* UC/non-SRQ Class E. */
1317                                         state = RESPST_CLEANUP;
1318                                 }
1319                         }
1320                         break;
1321
1322                 case RESPST_ERR_LENGTH:
1323                         if (qp_type(qp) == IB_QPT_RC) {
1324                                 /* Class C */
1325                                 do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1326                                                   IB_WC_REM_INV_REQ_ERR);
1327                                 state = RESPST_COMPLETE;
1328                         } else if (qp->srq) {
1329                                 /* UC/UD - class E */
1330                                 qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1331                                 state = RESPST_COMPLETE;
1332                         } else {
1333                                 /* UC/UD - class D */
1334                                 qp->resp.drop_msg = 1;
1335                                 state = RESPST_CLEANUP;
1336                         }
1337                         break;
1338
1339                 case RESPST_ERR_MALFORMED_WQE:
1340                         /* All, Class A. */
1341                         do_class_ac_error(qp, AETH_NAK_REM_OP_ERR,
1342                                           IB_WC_LOC_QP_OP_ERR);
1343                         state = RESPST_COMPLETE;
1344                         break;
1345
1346                 case RESPST_ERR_CQ_OVERFLOW:
1347                         /* All - Class G */
1348                         state = RESPST_ERROR;
1349                         break;
1350
1351                 case RESPST_DONE:
1352                         if (qp->resp.goto_error) {
1353                                 state = RESPST_ERROR;
1354                                 break;
1355                         }
1356
1357                         goto done;
1358
1359                 case RESPST_EXIT:
1360                         if (qp->resp.goto_error) {
1361                                 state = RESPST_ERROR;
1362                                 break;
1363                         }
1364
1365                         goto exit;
1366
1367                 case RESPST_RESET: {
1368                         struct sk_buff *skb;
1369
1370                         while ((skb = skb_dequeue(&qp->req_pkts))) {
1371                                 rxe_drop_ref(qp);
1372                                 kfree_skb(skb);
1373                         }
1374
1375                         while (!qp->srq && qp->rq.queue &&
1376                                queue_head(qp->rq.queue))
1377                                 advance_consumer(qp->rq.queue);
1378
1379                         qp->resp.wqe = NULL;
1380                         goto exit;
1381                 }
1382
1383                 case RESPST_ERROR:
1384                         qp->resp.goto_error = 0;
1385                         pr_warn("qp#%d moved to error state\n", qp_num(qp));
1386                         rxe_qp_error(qp);
1387                         goto exit;
1388
1389                 default:
1390                         WARN_ON(1);
1391                 }
1392         }
1393
1394 exit:
1395         ret = -EAGAIN;
1396 done:
1397         return ret;
1398 }