drivers/infiniband/sw/rxe/rxe

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
rxe_resp_queue_pkt
get_req
check_psn
check_op_seq
check_op_valid
get_srq_wqe
check_resource
check_length
check_rkey
send_data_in
write_data_in
process_atomic
prepare_ack_packet
read_reply
build_rdma_network_hdr
execute
do_complete
send_ack
send_atomic_ack
acknowledge
cleanup
find_resource
duplicate_request
do_class_ac_error
do_class_d1e_error
rxe_drain_req_pkts
rxe_responder
   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         if (bth_pad(&ack_pkt)) {
 736                 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
 737                 u8 *pad = payload_addr(&ack_pkt) + payload;
 738 
 739                 memset(pad, 0, bth_pad(&ack_pkt));
 740                 icrc = rxe_crc32(rxe, icrc, pad, bth_pad(&ack_pkt));
 741         }
 742         p = payload_addr(&ack_pkt) + payload + bth_pad(&ack_pkt);
 743         *p = ~icrc;
 744 
 745         err = rxe_xmit_packet(qp, &ack_pkt, skb);
 746         if (err) {
 747                 pr_err("Failed sending RDMA reply.\n");
 748                 return RESPST_ERR_RNR;
 749         }
 750 
 751         res->read.va += payload;
 752         res->read.resid -= payload;
 753         res->cur_psn = (res->cur_psn + 1) & BTH_PSN_MASK;
 754 
 755         if (res->read.resid > 0) {
 756                 state = RESPST_DONE;
 757         } else {
 758                 qp->resp.res = NULL;
 759                 if (!res->replay)
 760                         qp->resp.opcode = -1;
 761                 if (psn_compare(res->cur_psn, qp->resp.psn) >= 0)
 762                         qp->resp.psn = res->cur_psn;
 763                 state = RESPST_CLEANUP;
 764         }
 765 
 766         return state;
 767 }
 768 
 769 static void build_rdma_network_hdr(union rdma_network_hdr *hdr,
 770                                    struct rxe_pkt_info *pkt)
 771 {
 772         struct sk_buff *skb = PKT_TO_SKB(pkt);
 773 
 774         memset(hdr, 0, sizeof(*hdr));
 775         if (skb->protocol == htons(ETH_P_IP))
 776                 memcpy(&hdr->roce4grh, ip_hdr(skb), sizeof(hdr->roce4grh));
 777         else if (skb->protocol == htons(ETH_P_IPV6))
 778                 memcpy(&hdr->ibgrh, ipv6_hdr(skb), sizeof(hdr->ibgrh));
 779 }
 780 
 781 /* Executes a new request. A retried request never reach that function (send
 782  * and writes are discarded, and reads and atomics are retried elsewhere.
 783  */
 784 static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt)
 785 {
 786         enum resp_states err;
 787 
 788         if (pkt->mask & RXE_SEND_MASK) {
 789                 if (qp_type(qp) == IB_QPT_UD ||
 790                     qp_type(qp) == IB_QPT_SMI ||
 791                     qp_type(qp) == IB_QPT_GSI) {
 792                         union rdma_network_hdr hdr;
 793 
 794                         build_rdma_network_hdr(&hdr, pkt);
 795 
 796                         err = send_data_in(qp, &hdr, sizeof(hdr));
 797                         if (err)
 798                                 return err;
 799                 }
 800                 err = send_data_in(qp, payload_addr(pkt), payload_size(pkt));
 801                 if (err)
 802                         return err;
 803         } else if (pkt->mask & RXE_WRITE_MASK) {
 804                 err = write_data_in(qp, pkt);
 805                 if (err)
 806                         return err;
 807         } else if (pkt->mask & RXE_READ_MASK) {
 808                 /* For RDMA Read we can increment the msn now. See C9-148. */
 809                 qp->resp.msn++;
 810                 return RESPST_READ_REPLY;
 811         } else if (pkt->mask & RXE_ATOMIC_MASK) {
 812                 err = process_atomic(qp, pkt);
 813                 if (err)
 814                         return err;
 815         } else {
 816                 /* Unreachable */
 817                 WARN_ON_ONCE(1);
 818         }
 819 
 820         /* next expected psn, read handles this separately */
 821         qp->resp.psn = (pkt->psn + 1) & BTH_PSN_MASK;
 822         qp->resp.ack_psn = qp->resp.psn;
 823 
 824         qp->resp.opcode = pkt->opcode;
 825         qp->resp.status = IB_WC_SUCCESS;
 826 
 827         if (pkt->mask & RXE_COMP_MASK) {
 828                 /* We successfully processed this new request. */
 829                 qp->resp.msn++;
 830                 return RESPST_COMPLETE;
 831         } else if (qp_type(qp) == IB_QPT_RC)
 832                 return RESPST_ACKNOWLEDGE;
 833         else
 834                 return RESPST_CLEANUP;
 835 }
 836 
 837 static enum resp_states do_complete(struct rxe_qp *qp,
 838                                     struct rxe_pkt_info *pkt)
 839 {
 840         struct rxe_cqe cqe;
 841         struct ib_wc *wc = &cqe.ibwc;
 842         struct ib_uverbs_wc *uwc = &cqe.uibwc;
 843         struct rxe_recv_wqe *wqe = qp->resp.wqe;
 844         struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
 845 
 846         if (unlikely(!wqe))
 847                 return RESPST_CLEANUP;
 848 
 849         memset(&cqe, 0, sizeof(cqe));
 850 
 851         if (qp->rcq->is_user) {
 852                 uwc->status             = qp->resp.status;
 853                 uwc->qp_num             = qp->ibqp.qp_num;
 854                 uwc->wr_id              = wqe->wr_id;
 855         } else {
 856                 wc->status              = qp->resp.status;
 857                 wc->qp                  = &qp->ibqp;
 858                 wc->wr_id               = wqe->wr_id;
 859         }
 860 
 861         if (wc->status == IB_WC_SUCCESS) {
 862                 rxe_counter_inc(rxe, RXE_CNT_RDMA_RECV);
 863                 wc->opcode = (pkt->mask & RXE_IMMDT_MASK &&
 864                                 pkt->mask & RXE_WRITE_MASK) ?
 865                                         IB_WC_RECV_RDMA_WITH_IMM : IB_WC_RECV;
 866                 wc->vendor_err = 0;
 867                 wc->byte_len = (pkt->mask & RXE_IMMDT_MASK &&
 868                                 pkt->mask & RXE_WRITE_MASK) ?
 869                                         qp->resp.length : wqe->dma.length - wqe->dma.resid;
 870 
 871                 /* fields after byte_len are different between kernel and user
 872                  * space
 873                  */
 874                 if (qp->rcq->is_user) {
 875                         uwc->wc_flags = IB_WC_GRH;
 876 
 877                         if (pkt->mask & RXE_IMMDT_MASK) {
 878                                 uwc->wc_flags |= IB_WC_WITH_IMM;
 879                                 uwc->ex.imm_data = immdt_imm(pkt);
 880                         }
 881 
 882                         if (pkt->mask & RXE_IETH_MASK) {
 883                                 uwc->wc_flags |= IB_WC_WITH_INVALIDATE;
 884                                 uwc->ex.invalidate_rkey = ieth_rkey(pkt);
 885                         }
 886 
 887                         uwc->qp_num             = qp->ibqp.qp_num;
 888 
 889                         if (pkt->mask & RXE_DETH_MASK)
 890                                 uwc->src_qp = deth_sqp(pkt);
 891 
 892                         uwc->port_num           = qp->attr.port_num;
 893                 } else {
 894                         struct sk_buff *skb = PKT_TO_SKB(pkt);
 895 
 896                         wc->wc_flags = IB_WC_GRH | IB_WC_WITH_NETWORK_HDR_TYPE;
 897                         if (skb->protocol == htons(ETH_P_IP))
 898                                 wc->network_hdr_type = RDMA_NETWORK_IPV4;
 899                         else
 900                                 wc->network_hdr_type = RDMA_NETWORK_IPV6;
 901 
 902                         if (is_vlan_dev(skb->dev)) {
 903                                 wc->wc_flags |= IB_WC_WITH_VLAN;
 904                                 wc->vlan_id = vlan_dev_vlan_id(skb->dev);
 905                         }
 906 
 907                         if (pkt->mask & RXE_IMMDT_MASK) {
 908                                 wc->wc_flags |= IB_WC_WITH_IMM;
 909                                 wc->ex.imm_data = immdt_imm(pkt);
 910                         }
 911 
 912                         if (pkt->mask & RXE_IETH_MASK) {
 913                                 struct rxe_mem *rmr;
 914 
 915                                 wc->wc_flags |= IB_WC_WITH_INVALIDATE;
 916                                 wc->ex.invalidate_rkey = ieth_rkey(pkt);
 917 
 918                                 rmr = rxe_pool_get_index(&rxe->mr_pool,
 919                                                          wc->ex.invalidate_rkey >> 8);
 920                                 if (unlikely(!rmr)) {
 921                                         pr_err("Bad rkey %#x invalidation\n",
 922                                                wc->ex.invalidate_rkey);
 923                                         return RESPST_ERROR;
 924                                 }
 925                                 rmr->state = RXE_MEM_STATE_FREE;
 926                                 rxe_drop_ref(rmr);
 927                         }
 928 
 929                         wc->qp                  = &qp->ibqp;
 930 
 931                         if (pkt->mask & RXE_DETH_MASK)
 932                                 wc->src_qp = deth_sqp(pkt);
 933 
 934                         wc->port_num            = qp->attr.port_num;
 935                 }
 936         }
 937 
 938         /* have copy for srq and reference for !srq */
 939         if (!qp->srq)
 940                 advance_consumer(qp->rq.queue);
 941 
 942         qp->resp.wqe = NULL;
 943 
 944         if (rxe_cq_post(qp->rcq, &cqe, pkt ? bth_se(pkt) : 1))
 945                 return RESPST_ERR_CQ_OVERFLOW;
 946 
 947         if (qp->resp.state == QP_STATE_ERROR)
 948                 return RESPST_CHK_RESOURCE;
 949 
 950         if (!pkt)
 951                 return RESPST_DONE;
 952         else if (qp_type(qp) == IB_QPT_RC)
 953                 return RESPST_ACKNOWLEDGE;
 954         else
 955                 return RESPST_CLEANUP;
 956 }
 957 
 958 static int send_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
 959                     u8 syndrome, u32 psn)
 960 {
 961         int err = 0;
 962         struct rxe_pkt_info ack_pkt;
 963         struct sk_buff *skb;
 964 
 965         skb = prepare_ack_packet(qp, pkt, &ack_pkt, IB_OPCODE_RC_ACKNOWLEDGE,
 966                                  0, psn, syndrome, NULL);
 967         if (!skb) {
 968                 err = -ENOMEM;
 969                 goto err1;
 970         }
 971 
 972         err = rxe_xmit_packet(qp, &ack_pkt, skb);
 973         if (err)
 974                 pr_err_ratelimited("Failed sending ack\n");
 975 
 976 err1:
 977         return err;
 978 }
 979 
 980 static int send_atomic_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
 981                            u8 syndrome)
 982 {
 983         int rc = 0;
 984         struct rxe_pkt_info ack_pkt;
 985         struct sk_buff *skb;
 986         struct resp_res *res;
 987 
 988         skb = prepare_ack_packet(qp, pkt, &ack_pkt,
 989                                  IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE, 0, pkt->psn,
 990                                  syndrome, NULL);
 991         if (!skb) {
 992                 rc = -ENOMEM;
 993                 goto out;
 994         }
 995 
 996         rxe_add_ref(qp);
 997 
 998         res = &qp->resp.resources[qp->resp.res_head];
 999         free_rd_atomic_resource(qp, res);
1000         rxe_advance_resp_resource(qp);
1001 
1002         memcpy(SKB_TO_PKT(skb), &ack_pkt, sizeof(ack_pkt));
1003         memset((unsigned char *)SKB_TO_PKT(skb) + sizeof(ack_pkt), 0,
1004                sizeof(skb->cb) - sizeof(ack_pkt));
1005 
1006         skb_get(skb);
1007         res->type = RXE_ATOMIC_MASK;
1008         res->atomic.skb = skb;
1009         res->first_psn = ack_pkt.psn;
1010         res->last_psn  = ack_pkt.psn;
1011         res->cur_psn   = ack_pkt.psn;
1012 
1013         rc = rxe_xmit_packet(qp, &ack_pkt, skb);
1014         if (rc) {
1015                 pr_err_ratelimited("Failed sending ack\n");
1016                 rxe_drop_ref(qp);
1017         }
1018 out:
1019         return rc;
1020 }
1021 
1022 static enum resp_states acknowledge(struct rxe_qp *qp,
1023                                     struct rxe_pkt_info *pkt)
1024 {
1025         if (qp_type(qp) != IB_QPT_RC)
1026                 return RESPST_CLEANUP;
1027 
1028         if (qp->resp.aeth_syndrome != AETH_ACK_UNLIMITED)
1029                 send_ack(qp, pkt, qp->resp.aeth_syndrome, pkt->psn);
1030         else if (pkt->mask & RXE_ATOMIC_MASK)
1031                 send_atomic_ack(qp, pkt, AETH_ACK_UNLIMITED);
1032         else if (bth_ack(pkt))
1033                 send_ack(qp, pkt, AETH_ACK_UNLIMITED, pkt->psn);
1034 
1035         return RESPST_CLEANUP;
1036 }
1037 
1038 static enum resp_states cleanup(struct rxe_qp *qp,
1039                                 struct rxe_pkt_info *pkt)
1040 {
1041         struct sk_buff *skb;
1042 
1043         if (pkt) {
1044                 skb = skb_dequeue(&qp->req_pkts);
1045                 rxe_drop_ref(qp);
1046                 kfree_skb(skb);
1047         }
1048 
1049         if (qp->resp.mr) {
1050                 rxe_drop_ref(qp->resp.mr);
1051                 qp->resp.mr = NULL;
1052         }
1053 
1054         return RESPST_DONE;
1055 }
1056 
1057 static struct resp_res *find_resource(struct rxe_qp *qp, u32 psn)
1058 {
1059         int i;
1060 
1061         for (i = 0; i < qp->attr.max_dest_rd_atomic; i++) {
1062                 struct resp_res *res = &qp->resp.resources[i];
1063 
1064                 if (res->type == 0)
1065                         continue;
1066 
1067                 if (psn_compare(psn, res->first_psn) >= 0 &&
1068                     psn_compare(psn, res->last_psn) <= 0) {
1069                         return res;
1070                 }
1071         }
1072 
1073         return NULL;
1074 }
1075 
1076 static enum resp_states duplicate_request(struct rxe_qp *qp,
1077                                           struct rxe_pkt_info *pkt)
1078 {
1079         enum resp_states rc;
1080         u32 prev_psn = (qp->resp.ack_psn - 1) & BTH_PSN_MASK;
1081 
1082         if (pkt->mask & RXE_SEND_MASK ||
1083             pkt->mask & RXE_WRITE_MASK) {
1084                 /* SEND. Ack again and cleanup. C9-105. */
1085                 if (bth_ack(pkt))
1086                         send_ack(qp, pkt, AETH_ACK_UNLIMITED, prev_psn);
1087                 rc = RESPST_CLEANUP;
1088                 goto out;
1089         } else if (pkt->mask & RXE_READ_MASK) {
1090                 struct resp_res *res;
1091 
1092                 res = find_resource(qp, pkt->psn);
1093                 if (!res) {
1094                         /* Resource not found. Class D error.  Drop the
1095                          * request.
1096                          */
1097                         rc = RESPST_CLEANUP;
1098                         goto out;
1099                 } else {
1100                         /* Ensure this new request is the same as the previous
1101                          * one or a subset of it.
1102                          */
1103                         u64 iova = reth_va(pkt);
1104                         u32 resid = reth_len(pkt);
1105 
1106                         if (iova < res->read.va_org ||
1107                             resid > res->read.length ||
1108                             (iova + resid) > (res->read.va_org +
1109                                               res->read.length)) {
1110                                 rc = RESPST_CLEANUP;
1111                                 goto out;
1112                         }
1113 
1114                         if (reth_rkey(pkt) != res->read.rkey) {
1115                                 rc = RESPST_CLEANUP;
1116                                 goto out;
1117                         }
1118 
1119                         res->cur_psn = pkt->psn;
1120                         res->state = (pkt->psn == res->first_psn) ?
1121                                         rdatm_res_state_new :
1122                                         rdatm_res_state_replay;
1123                         res->replay = 1;
1124 
1125                         /* Reset the resource, except length. */
1126                         res->read.va_org = iova;
1127                         res->read.va = iova;
1128                         res->read.resid = resid;
1129 
1130                         /* Replay the RDMA read reply. */
1131                         qp->resp.res = res;
1132                         rc = RESPST_READ_REPLY;
1133                         goto out;
1134                 }
1135         } else {
1136                 struct resp_res *res;
1137 
1138                 /* Find the operation in our list of responder resources. */
1139                 res = find_resource(qp, pkt->psn);
1140                 if (res) {
1141                         skb_get(res->atomic.skb);
1142                         /* Resend the result. */
1143                         rc = rxe_xmit_packet(qp, pkt, res->atomic.skb);
1144                         if (rc) {
1145                                 pr_err("Failed resending result. This flow is not handled - skb ignored\n");
1146                                 rc = RESPST_CLEANUP;
1147                                 goto out;
1148                         }
1149                 }
1150 
1151                 /* Resource not found. Class D error. Drop the request. */
1152                 rc = RESPST_CLEANUP;
1153                 goto out;
1154         }
1155 out:
1156         return rc;
1157 }
1158 
1159 /* Process a class A or C. Both are treated the same in this implementation. */
1160 static void do_class_ac_error(struct rxe_qp *qp, u8 syndrome,
1161                               enum ib_wc_status status)
1162 {
1163         qp->resp.aeth_syndrome  = syndrome;
1164         qp->resp.status         = status;
1165 
1166         /* indicate that we should go through the ERROR state */
1167         qp->resp.goto_error     = 1;
1168 }
1169 
1170 static enum resp_states do_class_d1e_error(struct rxe_qp *qp)
1171 {
1172         /* UC */
1173         if (qp->srq) {
1174                 /* Class E */
1175                 qp->resp.drop_msg = 1;
1176                 if (qp->resp.wqe) {
1177                         qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1178                         return RESPST_COMPLETE;
1179                 } else {
1180                         return RESPST_CLEANUP;
1181                 }
1182         } else {
1183                 /* Class D1. This packet may be the start of a
1184                  * new message and could be valid. The previous
1185                  * message is invalid and ignored. reset the
1186                  * recv wr to its original state
1187                  */
1188                 if (qp->resp.wqe) {
1189                         qp->resp.wqe->dma.resid = qp->resp.wqe->dma.length;
1190                         qp->resp.wqe->dma.cur_sge = 0;
1191                         qp->resp.wqe->dma.sge_offset = 0;
1192                         qp->resp.opcode = -1;
1193                 }
1194 
1195                 if (qp->resp.mr) {
1196                         rxe_drop_ref(qp->resp.mr);
1197                         qp->resp.mr = NULL;
1198                 }
1199 
1200                 return RESPST_CLEANUP;
1201         }
1202 }
1203 
1204 static void rxe_drain_req_pkts(struct rxe_qp *qp, bool notify)
1205 {
1206         struct sk_buff *skb;
1207 
1208         while ((skb = skb_dequeue(&qp->req_pkts))) {
1209                 rxe_drop_ref(qp);
1210                 kfree_skb(skb);
1211         }
1212 
1213         if (notify)
1214                 return;
1215 
1216         while (!qp->srq && qp->rq.queue && queue_head(qp->rq.queue))
1217                 advance_consumer(qp->rq.queue);
1218 }
1219 
1220 int rxe_responder(void *arg)
1221 {
1222         struct rxe_qp *qp = (struct rxe_qp *)arg;
1223         struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
1224         enum resp_states state;
1225         struct rxe_pkt_info *pkt = NULL;
1226         int ret = 0;
1227 
1228         rxe_add_ref(qp);
1229 
1230         qp->resp.aeth_syndrome = AETH_ACK_UNLIMITED;
1231 
1232         if (!qp->valid) {
1233                 ret = -EINVAL;
1234                 goto done;
1235         }
1236 
1237         switch (qp->resp.state) {
1238         case QP_STATE_RESET:
1239                 state = RESPST_RESET;
1240                 break;
1241 
1242         default:
1243                 state = RESPST_GET_REQ;
1244                 break;
1245         }
1246 
1247         while (1) {
1248                 pr_debug("qp#%d state = %s\n", qp_num(qp),
1249                          resp_state_name[state]);
1250                 switch (state) {
1251                 case RESPST_GET_REQ:
1252                         state = get_req(qp, &pkt);
1253                         break;
1254                 case RESPST_CHK_PSN:
1255                         state = check_psn(qp, pkt);
1256                         break;
1257                 case RESPST_CHK_OP_SEQ:
1258                         state = check_op_seq(qp, pkt);
1259                         break;
1260                 case RESPST_CHK_OP_VALID:
1261                         state = check_op_valid(qp, pkt);
1262                         break;
1263                 case RESPST_CHK_RESOURCE:
1264                         state = check_resource(qp, pkt);
1265                         break;
1266                 case RESPST_CHK_LENGTH:
1267                         state = check_length(qp, pkt);
1268                         break;
1269                 case RESPST_CHK_RKEY:
1270                         state = check_rkey(qp, pkt);
1271                         break;
1272                 case RESPST_EXECUTE:
1273                         state = execute(qp, pkt);
1274                         break;
1275                 case RESPST_COMPLETE:
1276                         state = do_complete(qp, pkt);
1277                         break;
1278                 case RESPST_READ_REPLY:
1279                         state = read_reply(qp, pkt);
1280                         break;
1281                 case RESPST_ACKNOWLEDGE:
1282                         state = acknowledge(qp, pkt);
1283                         break;
1284                 case RESPST_CLEANUP:
1285                         state = cleanup(qp, pkt);
1286                         break;
1287                 case RESPST_DUPLICATE_REQUEST:
1288                         state = duplicate_request(qp, pkt);
1289                         break;
1290                 case RESPST_ERR_PSN_OUT_OF_SEQ:
1291                         /* RC only - Class B. Drop packet. */
1292                         send_ack(qp, pkt, AETH_NAK_PSN_SEQ_ERROR, qp->resp.psn);
1293                         state = RESPST_CLEANUP;
1294                         break;
1295 
1296                 case RESPST_ERR_TOO_MANY_RDMA_ATM_REQ:
1297                 case RESPST_ERR_MISSING_OPCODE_FIRST:
1298                 case RESPST_ERR_MISSING_OPCODE_LAST_C:
1299                 case RESPST_ERR_UNSUPPORTED_OPCODE:
1300                 case RESPST_ERR_MISALIGNED_ATOMIC:
1301                         /* RC Only - Class C. */
1302                         do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1303                                           IB_WC_REM_INV_REQ_ERR);
1304                         state = RESPST_COMPLETE;
1305                         break;
1306 
1307                 case RESPST_ERR_MISSING_OPCODE_LAST_D1E:
1308                         state = do_class_d1e_error(qp);
1309                         break;
1310                 case RESPST_ERR_RNR:
1311                         if (qp_type(qp) == IB_QPT_RC) {
1312                                 rxe_counter_inc(rxe, RXE_CNT_SND_RNR);
1313                                 /* RC - class B */
1314                                 send_ack(qp, pkt, AETH_RNR_NAK |
1315                                          (~AETH_TYPE_MASK &
1316                                          qp->attr.min_rnr_timer),
1317                                          pkt->psn);
1318                         } else {
1319                                 /* UD/UC - class D */
1320                                 qp->resp.drop_msg = 1;
1321                         }
1322                         state = RESPST_CLEANUP;
1323                         break;
1324 
1325                 case RESPST_ERR_RKEY_VIOLATION:
1326                         if (qp_type(qp) == IB_QPT_RC) {
1327                                 /* Class C */
1328                                 do_class_ac_error(qp, AETH_NAK_REM_ACC_ERR,
1329                                                   IB_WC_REM_ACCESS_ERR);
1330                                 state = RESPST_COMPLETE;
1331                         } else {
1332                                 qp->resp.drop_msg = 1;
1333                                 if (qp->srq) {
1334                                         /* UC/SRQ Class D */
1335                                         qp->resp.status = IB_WC_REM_ACCESS_ERR;
1336                                         state = RESPST_COMPLETE;
1337                                 } else {
1338                                         /* UC/non-SRQ Class E. */
1339                                         state = RESPST_CLEANUP;
1340                                 }
1341                         }
1342                         break;
1343 
1344                 case RESPST_ERR_LENGTH:
1345                         if (qp_type(qp) == IB_QPT_RC) {
1346                                 /* Class C */
1347                                 do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1348                                                   IB_WC_REM_INV_REQ_ERR);
1349                                 state = RESPST_COMPLETE;
1350                         } else if (qp->srq) {
1351                                 /* UC/UD - class E */
1352                                 qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1353                                 state = RESPST_COMPLETE;
1354                         } else {
1355                                 /* UC/UD - class D */
1356                                 qp->resp.drop_msg = 1;
1357                                 state = RESPST_CLEANUP;
1358                         }
1359                         break;
1360 
1361                 case RESPST_ERR_MALFORMED_WQE:
1362                         /* All, Class A. */
1363                         do_class_ac_error(qp, AETH_NAK_REM_OP_ERR,
1364                                           IB_WC_LOC_QP_OP_ERR);
1365                         state = RESPST_COMPLETE;
1366                         break;
1367 
1368                 case RESPST_ERR_CQ_OVERFLOW:
1369                         /* All - Class G */
1370                         state = RESPST_ERROR;
1371                         break;
1372 
1373                 case RESPST_DONE:
1374                         if (qp->resp.goto_error) {
1375                                 state = RESPST_ERROR;
1376                                 break;
1377                         }
1378 
1379                         goto done;
1380 
1381                 case RESPST_EXIT:
1382                         if (qp->resp.goto_error) {
1383                                 state = RESPST_ERROR;
1384                                 break;
1385                         }
1386 
1387                         goto exit;
1388 
1389                 case RESPST_RESET:
1390                         rxe_drain_req_pkts(qp, false);
1391                         qp->resp.wqe = NULL;
1392                         goto exit;
1393 
1394                 case RESPST_ERROR:
1395                         qp->resp.goto_error = 0;
1396                         pr_warn("qp#%d moved to error state\n", qp_num(qp));
1397                         rxe_qp_error(qp);
1398                         goto exit;
1399 
1400                 default:
1401                         WARN_ON_ONCE(1);
1402                 }
1403         }
1404 
1405 exit:
1406         ret = -EAGAIN;
1407 done:
1408         rxe_drop_ref(qp);
1409         return ret;
1410 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/infiniband/sw/rxe/rxe_resp.c

DEFINITIONS
