linux/drivers/infiniband/sw/rxe/rxe_resp.c
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   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
  40enum 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
  73static 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 */
 107void 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
 121static 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
 148static 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        struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
 153
 154        switch (qp_type(qp)) {
 155        case IB_QPT_RC:
 156                if (diff > 0) {
 157                        if (qp->resp.sent_psn_nak)
 158                                return RESPST_CLEANUP;
 159
 160                        qp->resp.sent_psn_nak = 1;
 161                        rxe_counter_inc(rxe, RXE_CNT_OUT_OF_SEQ_REQ);
 162                        return RESPST_ERR_PSN_OUT_OF_SEQ;
 163
 164                } else if (diff < 0) {
 165                        rxe_counter_inc(rxe, RXE_CNT_DUP_REQ);
 166                        return RESPST_DUPLICATE_REQUEST;
 167                }
 168
 169                if (qp->resp.sent_psn_nak)
 170                        qp->resp.sent_psn_nak = 0;
 171
 172                break;
 173
 174        case IB_QPT_UC:
 175                if (qp->resp.drop_msg || diff != 0) {
 176                        if (pkt->mask & RXE_START_MASK) {
 177                                qp->resp.drop_msg = 0;
 178                                return RESPST_CHK_OP_SEQ;
 179                        }
 180
 181                        qp->resp.drop_msg = 1;
 182                        return RESPST_CLEANUP;
 183                }
 184                break;
 185        default:
 186                break;
 187        }
 188
 189        return RESPST_CHK_OP_SEQ;
 190}
 191
 192static enum resp_states check_op_seq(struct rxe_qp *qp,
 193                                     struct rxe_pkt_info *pkt)
 194{
 195        switch (qp_type(qp)) {
 196        case IB_QPT_RC:
 197                switch (qp->resp.opcode) {
 198                case IB_OPCODE_RC_SEND_FIRST:
 199                case IB_OPCODE_RC_SEND_MIDDLE:
 200                        switch (pkt->opcode) {
 201                        case IB_OPCODE_RC_SEND_MIDDLE:
 202                        case IB_OPCODE_RC_SEND_LAST:
 203                        case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE:
 204                        case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE:
 205                                return RESPST_CHK_OP_VALID;
 206                        default:
 207                                return RESPST_ERR_MISSING_OPCODE_LAST_C;
 208                        }
 209
 210                case IB_OPCODE_RC_RDMA_WRITE_FIRST:
 211                case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
 212                        switch (pkt->opcode) {
 213                        case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
 214                        case IB_OPCODE_RC_RDMA_WRITE_LAST:
 215                        case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
 216                                return RESPST_CHK_OP_VALID;
 217                        default:
 218                                return RESPST_ERR_MISSING_OPCODE_LAST_C;
 219                        }
 220
 221                default:
 222                        switch (pkt->opcode) {
 223                        case IB_OPCODE_RC_SEND_MIDDLE:
 224                        case IB_OPCODE_RC_SEND_LAST:
 225                        case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE:
 226                        case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE:
 227                        case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
 228                        case IB_OPCODE_RC_RDMA_WRITE_LAST:
 229                        case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
 230                                return RESPST_ERR_MISSING_OPCODE_FIRST;
 231                        default:
 232                                return RESPST_CHK_OP_VALID;
 233                        }
 234                }
 235                break;
 236
 237        case IB_QPT_UC:
 238                switch (qp->resp.opcode) {
 239                case IB_OPCODE_UC_SEND_FIRST:
 240                case IB_OPCODE_UC_SEND_MIDDLE:
 241                        switch (pkt->opcode) {
 242                        case IB_OPCODE_UC_SEND_MIDDLE:
 243                        case IB_OPCODE_UC_SEND_LAST:
 244                        case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE:
 245                                return RESPST_CHK_OP_VALID;
 246                        default:
 247                                return RESPST_ERR_MISSING_OPCODE_LAST_D1E;
 248                        }
 249
 250                case IB_OPCODE_UC_RDMA_WRITE_FIRST:
 251                case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
 252                        switch (pkt->opcode) {
 253                        case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
 254                        case IB_OPCODE_UC_RDMA_WRITE_LAST:
 255                        case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
 256                                return RESPST_CHK_OP_VALID;
 257                        default:
 258                                return RESPST_ERR_MISSING_OPCODE_LAST_D1E;
 259                        }
 260
 261                default:
 262                        switch (pkt->opcode) {
 263                        case IB_OPCODE_UC_SEND_MIDDLE:
 264                        case IB_OPCODE_UC_SEND_LAST:
 265                        case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE:
 266                        case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
 267                        case IB_OPCODE_UC_RDMA_WRITE_LAST:
 268                        case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
 269                                qp->resp.drop_msg = 1;
 270                                return RESPST_CLEANUP;
 271                        default:
 272                                return RESPST_CHK_OP_VALID;
 273                        }
 274                }
 275                break;
 276
 277        default:
 278                return RESPST_CHK_OP_VALID;
 279        }
 280}
 281
 282static enum resp_states check_op_valid(struct rxe_qp *qp,
 283                                       struct rxe_pkt_info *pkt)
 284{
 285        switch (qp_type(qp)) {
 286        case IB_QPT_RC:
 287                if (((pkt->mask & RXE_READ_MASK) &&
 288                     !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_READ)) ||
 289                    ((pkt->mask & RXE_WRITE_MASK) &&
 290                     !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) ||
 291                    ((pkt->mask & RXE_ATOMIC_MASK) &&
 292                     !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) {
 293                        return RESPST_ERR_UNSUPPORTED_OPCODE;
 294                }
 295
 296                break;
 297
 298        case IB_QPT_UC:
 299                if ((pkt->mask & RXE_WRITE_MASK) &&
 300                    !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) {
 301                        qp->resp.drop_msg = 1;
 302                        return RESPST_CLEANUP;
 303                }
 304
 305                break;
 306
 307        case IB_QPT_UD:
 308        case IB_QPT_SMI:
 309        case IB_QPT_GSI:
 310                break;
 311
 312        default:
 313                WARN_ON_ONCE(1);
 314                break;
 315        }
 316
 317        return RESPST_CHK_RESOURCE;
 318}
 319
 320static enum resp_states get_srq_wqe(struct rxe_qp *qp)
 321{
 322        struct rxe_srq *srq = qp->srq;
 323        struct rxe_queue *q = srq->rq.queue;
 324        struct rxe_recv_wqe *wqe;
 325        struct ib_event ev;
 326
 327        if (srq->error)
 328                return RESPST_ERR_RNR;
 329
 330        spin_lock_bh(&srq->rq.consumer_lock);
 331
 332        wqe = queue_head(q);
 333        if (!wqe) {
 334                spin_unlock_bh(&srq->rq.consumer_lock);
 335                return RESPST_ERR_RNR;
 336        }
 337
 338        /* note kernel and user space recv wqes have same size */
 339        memcpy(&qp->resp.srq_wqe, wqe, sizeof(qp->resp.srq_wqe));
 340
 341        qp->resp.wqe = &qp->resp.srq_wqe.wqe;
 342        advance_consumer(q);
 343
 344        if (srq->limit && srq->ibsrq.event_handler &&
 345            (queue_count(q) < srq->limit)) {
 346                srq->limit = 0;
 347                goto event;
 348        }
 349
 350        spin_unlock_bh(&srq->rq.consumer_lock);
 351        return RESPST_CHK_LENGTH;
 352
 353event:
 354        spin_unlock_bh(&srq->rq.consumer_lock);
 355        ev.device = qp->ibqp.device;
 356        ev.element.srq = qp->ibqp.srq;
 357        ev.event = IB_EVENT_SRQ_LIMIT_REACHED;
 358        srq->ibsrq.event_handler(&ev, srq->ibsrq.srq_context);
 359        return RESPST_CHK_LENGTH;
 360}
 361
 362static enum resp_states check_resource(struct rxe_qp *qp,
 363                                       struct rxe_pkt_info *pkt)
 364{
 365        struct rxe_srq *srq = qp->srq;
 366
 367        if (qp->resp.state == QP_STATE_ERROR) {
 368                if (qp->resp.wqe) {
 369                        qp->resp.status = IB_WC_WR_FLUSH_ERR;
 370                        return RESPST_COMPLETE;
 371                } else if (!srq) {
 372                        qp->resp.wqe = queue_head(qp->rq.queue);
 373                        if (qp->resp.wqe) {
 374                                qp->resp.status = IB_WC_WR_FLUSH_ERR;
 375                                return RESPST_COMPLETE;
 376                        } else {
 377                                return RESPST_EXIT;
 378                        }
 379                } else {
 380                        return RESPST_EXIT;
 381                }
 382        }
 383
 384        if (pkt->mask & RXE_READ_OR_ATOMIC) {
 385                /* it is the requesters job to not send
 386                 * too many read/atomic ops, we just
 387                 * recycle the responder resource queue
 388                 */
 389                if (likely(qp->attr.max_dest_rd_atomic > 0))
 390                        return RESPST_CHK_LENGTH;
 391                else
 392                        return RESPST_ERR_TOO_MANY_RDMA_ATM_REQ;
 393        }
 394
 395        if (pkt->mask & RXE_RWR_MASK) {
 396                if (srq)
 397                        return get_srq_wqe(qp);
 398
 399                qp->resp.wqe = queue_head(qp->rq.queue);
 400                return (qp->resp.wqe) ? RESPST_CHK_LENGTH : RESPST_ERR_RNR;
 401        }
 402
 403        return RESPST_CHK_LENGTH;
 404}
 405
 406static enum resp_states check_length(struct rxe_qp *qp,
 407                                     struct rxe_pkt_info *pkt)
 408{
 409        switch (qp_type(qp)) {
 410        case IB_QPT_RC:
 411                return RESPST_CHK_RKEY;
 412
 413        case IB_QPT_UC:
 414                return RESPST_CHK_RKEY;
 415
 416        default:
 417                return RESPST_CHK_RKEY;
 418        }
 419}
 420
 421static enum resp_states check_rkey(struct rxe_qp *qp,
 422                                   struct rxe_pkt_info *pkt)
 423{
 424        struct rxe_mem *mem = NULL;
 425        u64 va;
 426        u32 rkey;
 427        u32 resid;
 428        u32 pktlen;
 429        int mtu = qp->mtu;
 430        enum resp_states state;
 431        int access;
 432
 433        if (pkt->mask & (RXE_READ_MASK | RXE_WRITE_MASK)) {
 434                if (pkt->mask & RXE_RETH_MASK) {
 435                        qp->resp.va = reth_va(pkt);
 436                        qp->resp.rkey = reth_rkey(pkt);
 437                        qp->resp.resid = reth_len(pkt);
 438                }
 439                access = (pkt->mask & RXE_READ_MASK) ? IB_ACCESS_REMOTE_READ
 440                                                     : IB_ACCESS_REMOTE_WRITE;
 441        } else if (pkt->mask & RXE_ATOMIC_MASK) {
 442                qp->resp.va = atmeth_va(pkt);
 443                qp->resp.rkey = atmeth_rkey(pkt);
 444                qp->resp.resid = sizeof(u64);
 445                access = IB_ACCESS_REMOTE_ATOMIC;
 446        } else {
 447                return RESPST_EXECUTE;
 448        }
 449
 450        /* A zero-byte op is not required to set an addr or rkey. */
 451        if ((pkt->mask & (RXE_READ_MASK | RXE_WRITE_OR_SEND)) &&
 452            (pkt->mask & RXE_RETH_MASK) &&
 453            reth_len(pkt) == 0) {
 454                return RESPST_EXECUTE;
 455        }
 456
 457        va      = qp->resp.va;
 458        rkey    = qp->resp.rkey;
 459        resid   = qp->resp.resid;
 460        pktlen  = payload_size(pkt);
 461
 462        mem = lookup_mem(qp->pd, access, rkey, lookup_remote);
 463        if (!mem) {
 464                state = RESPST_ERR_RKEY_VIOLATION;
 465                goto err;
 466        }
 467
 468        if (unlikely(mem->state == RXE_MEM_STATE_FREE)) {
 469                state = RESPST_ERR_RKEY_VIOLATION;
 470                goto err;
 471        }
 472
 473        if (mem_check_range(mem, va, resid)) {
 474                state = RESPST_ERR_RKEY_VIOLATION;
 475                goto err;
 476        }
 477
 478        if (pkt->mask & RXE_WRITE_MASK)  {
 479                if (resid > mtu) {
 480                        if (pktlen != mtu || bth_pad(pkt)) {
 481                                state = RESPST_ERR_LENGTH;
 482                                goto err;
 483                        }
 484                } else {
 485                        if (pktlen != resid) {
 486                                state = RESPST_ERR_LENGTH;
 487                                goto err;
 488                        }
 489                        if ((bth_pad(pkt) != (0x3 & (-resid)))) {
 490                                /* This case may not be exactly that
 491                                 * but nothing else fits.
 492                                 */
 493                                state = RESPST_ERR_LENGTH;
 494                                goto err;
 495                        }
 496                }
 497        }
 498
 499        WARN_ON_ONCE(qp->resp.mr);
 500
 501        qp->resp.mr = mem;
 502        return RESPST_EXECUTE;
 503
 504err:
 505        if (mem)
 506                rxe_drop_ref(mem);
 507        return state;
 508}
 509
 510static enum resp_states send_data_in(struct rxe_qp *qp, void *data_addr,
 511                                     int data_len)
 512{
 513        int err;
 514        struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
 515
 516        err = copy_data(rxe, qp->pd, IB_ACCESS_LOCAL_WRITE, &qp->resp.wqe->dma,
 517                        data_addr, data_len, to_mem_obj, NULL);
 518        if (unlikely(err))
 519                return (err == -ENOSPC) ? RESPST_ERR_LENGTH
 520                                        : RESPST_ERR_MALFORMED_WQE;
 521
 522        return RESPST_NONE;
 523}
 524
 525static enum resp_states write_data_in(struct rxe_qp *qp,
 526                                      struct rxe_pkt_info *pkt)
 527{
 528        enum resp_states rc = RESPST_NONE;
 529        int     err;
 530        int data_len = payload_size(pkt);
 531
 532        err = rxe_mem_copy(qp->resp.mr, qp->resp.va, payload_addr(pkt),
 533                           data_len, to_mem_obj, NULL);
 534        if (err) {
 535                rc = RESPST_ERR_RKEY_VIOLATION;
 536                goto out;
 537        }
 538
 539        qp->resp.va += data_len;
 540        qp->resp.resid -= data_len;
 541
 542out:
 543        return rc;
 544}
 545
 546/* Guarantee atomicity of atomic operations at the machine level. */
 547static DEFINE_SPINLOCK(atomic_ops_lock);
 548
 549static enum resp_states process_atomic(struct rxe_qp *qp,
 550                                       struct rxe_pkt_info *pkt)
 551{
 552        u64 iova = atmeth_va(pkt);
 553        u64 *vaddr;
 554        enum resp_states ret;
 555        struct rxe_mem *mr = qp->resp.mr;
 556
 557        if (mr->state != RXE_MEM_STATE_VALID) {
 558                ret = RESPST_ERR_RKEY_VIOLATION;
 559                goto out;
 560        }
 561
 562        vaddr = iova_to_vaddr(mr, iova, sizeof(u64));
 563
 564        /* check vaddr is 8 bytes aligned. */
 565        if (!vaddr || (uintptr_t)vaddr & 7) {
 566                ret = RESPST_ERR_MISALIGNED_ATOMIC;
 567                goto out;
 568        }
 569
 570        spin_lock_bh(&atomic_ops_lock);
 571
 572        qp->resp.atomic_orig = *vaddr;
 573
 574        if (pkt->opcode == IB_OPCODE_RC_COMPARE_SWAP ||
 575            pkt->opcode == IB_OPCODE_RD_COMPARE_SWAP) {
 576                if (*vaddr == atmeth_comp(pkt))
 577                        *vaddr = atmeth_swap_add(pkt);
 578        } else {
 579                *vaddr += atmeth_swap_add(pkt);
 580        }
 581
 582        spin_unlock_bh(&atomic_ops_lock);
 583
 584        ret = RESPST_NONE;
 585out:
 586        return ret;
 587}
 588
 589static struct sk_buff *prepare_ack_packet(struct rxe_qp *qp,
 590                                          struct rxe_pkt_info *pkt,
 591                                          struct rxe_pkt_info *ack,
 592                                          int opcode,
 593                                          int payload,
 594                                          u32 psn,
 595                                          u8 syndrome,
 596                                          u32 *crcp)
 597{
 598        struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
 599        struct sk_buff *skb;
 600        u32 crc = 0;
 601        u32 *p;
 602        int paylen;
 603        int pad;
 604        int err;
 605
 606        /*
 607         * allocate packet
 608         */
 609        pad = (-payload) & 0x3;
 610        paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE;
 611
 612        skb = rxe_init_packet(rxe, &qp->pri_av, paylen, ack);
 613        if (!skb)
 614                return NULL;
 615
 616        ack->qp = qp;
 617        ack->opcode = opcode;
 618        ack->mask = rxe_opcode[opcode].mask;
 619        ack->offset = pkt->offset;
 620        ack->paylen = paylen;
 621
 622        /* fill in bth using the request packet headers */
 623        memcpy(ack->hdr, pkt->hdr, pkt->offset + RXE_BTH_BYTES);
 624
 625        bth_set_opcode(ack, opcode);
 626        bth_set_qpn(ack, qp->attr.dest_qp_num);
 627        bth_set_pad(ack, pad);
 628        bth_set_se(ack, 0);
 629        bth_set_psn(ack, psn);
 630        bth_set_ack(ack, 0);
 631        ack->psn = psn;
 632
 633        if (ack->mask & RXE_AETH_MASK) {
 634                aeth_set_syn(ack, syndrome);
 635                aeth_set_msn(ack, qp->resp.msn);
 636        }
 637
 638        if (ack->mask & RXE_ATMACK_MASK)
 639                atmack_set_orig(ack, qp->resp.atomic_orig);
 640
 641        err = rxe_prepare(rxe, ack, skb, &crc);
 642        if (err) {
 643                kfree_skb(skb);
 644                return NULL;
 645        }
 646
 647        if (crcp) {
 648                /* CRC computation will be continued by the caller */
 649                *crcp = crc;
 650        } else {
 651                p = payload_addr(ack) + payload + bth_pad(ack);
 652                *p = ~crc;
 653        }
 654
 655        return skb;
 656}
 657
 658/* RDMA read response. If res is not NULL, then we have a current RDMA request
 659 * being processed or replayed.
 660 */
 661static enum resp_states read_reply(struct rxe_qp *qp,
 662                                   struct rxe_pkt_info *req_pkt)
 663{
 664        struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
 665        struct rxe_pkt_info ack_pkt;
 666        struct sk_buff *skb;
 667        int mtu = qp->mtu;
 668        enum resp_states state;
 669        int payload;
 670        int opcode;
 671        int err;
 672        struct resp_res *res = qp->resp.res;
 673        u32 icrc;
 674        u32 *p;
 675
 676        if (!res) {
 677                /* This is the first time we process that request. Get a
 678                 * resource
 679                 */
 680                res = &qp->resp.resources[qp->resp.res_head];
 681
 682                free_rd_atomic_resource(qp, res);
 683                rxe_advance_resp_resource(qp);
 684
 685                res->type               = RXE_READ_MASK;
 686
 687                res->read.va            = qp->resp.va;
 688                res->read.va_org        = qp->resp.va;
 689
 690                res->first_psn          = req_pkt->psn;
 691
 692                if (reth_len(req_pkt)) {
 693                        res->last_psn   = (req_pkt->psn +
 694                                           (reth_len(req_pkt) + mtu - 1) /
 695                                           mtu - 1) & BTH_PSN_MASK;
 696                } else {
 697                        res->last_psn   = res->first_psn;
 698                }
 699                res->cur_psn            = req_pkt->psn;
 700
 701                res->read.resid         = qp->resp.resid;
 702                res->read.length        = qp->resp.resid;
 703                res->read.rkey          = qp->resp.rkey;
 704
 705                /* note res inherits the reference to mr from qp */
 706                res->read.mr            = qp->resp.mr;
 707                qp->resp.mr             = NULL;
 708
 709                qp->resp.res            = res;
 710                res->state              = rdatm_res_state_new;
 711        }
 712
 713        if (res->state == rdatm_res_state_new) {
 714                if (res->read.resid <= mtu)
 715                        opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_ONLY;
 716                else
 717                        opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST;
 718        } else {
 719                if (res->read.resid > mtu)
 720                        opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE;
 721                else
 722                        opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_LAST;
 723        }
 724
 725        res->state = rdatm_res_state_next;
 726
 727        payload = min_t(int, res->read.resid, mtu);
 728
 729        skb = prepare_ack_packet(qp, req_pkt, &ack_pkt, opcode, payload,
 730                                 res->cur_psn, AETH_ACK_UNLIMITED, &icrc);
 731        if (!skb)
 732                return RESPST_ERR_RNR;
 733
 734        err = rxe_mem_copy(res->read.mr, res->read.va, payload_addr(&ack_pkt),
 735                           payload, from_mem_obj, &icrc);
 736        if (err)
 737                pr_err("Failed copying memory\n");
 738
 739        p = payload_addr(&ack_pkt) + payload + bth_pad(&ack_pkt);
 740        *p = ~icrc;
 741
 742        err = rxe_xmit_packet(rxe, qp, &ack_pkt, skb);
 743        if (err) {
 744                pr_err("Failed sending RDMA reply.\n");
 745                return RESPST_ERR_RNR;
 746        }
 747
 748        res->read.va += payload;
 749        res->read.resid -= payload;
 750        res->cur_psn = (res->cur_psn + 1) & BTH_PSN_MASK;
 751
 752        if (res->read.resid > 0) {
 753                state = RESPST_DONE;
 754        } else {
 755                qp->resp.res = NULL;
 756                qp->resp.opcode = -1;
 757                if (psn_compare(res->cur_psn, qp->resp.psn) >= 0)
 758                        qp->resp.psn = res->cur_psn;
 759                state = RESPST_CLEANUP;
 760        }
 761
 762        return state;
 763}
 764
 765static void build_rdma_network_hdr(union rdma_network_hdr *hdr,
 766                                   struct rxe_pkt_info *pkt)
 767{
 768        struct sk_buff *skb = PKT_TO_SKB(pkt);
 769
 770        memset(hdr, 0, sizeof(*hdr));
 771        if (skb->protocol == htons(ETH_P_IP))
 772                memcpy(&hdr->roce4grh, ip_hdr(skb), sizeof(hdr->roce4grh));
 773        else if (skb->protocol == htons(ETH_P_IPV6))
 774                memcpy(&hdr->ibgrh, ipv6_hdr(skb), sizeof(hdr->ibgrh));
 775}
 776
 777/* Executes a new request. A retried request never reach that function (send
 778 * and writes are discarded, and reads and atomics are retried elsewhere.
 779 */
 780static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt)
 781{
 782        enum resp_states err;
 783
 784        if (pkt->mask & RXE_SEND_MASK) {
 785                if (qp_type(qp) == IB_QPT_UD ||
 786                    qp_type(qp) == IB_QPT_SMI ||
 787                    qp_type(qp) == IB_QPT_GSI) {
 788                        union rdma_network_hdr hdr;
 789
 790                        build_rdma_network_hdr(&hdr, pkt);
 791
 792                        err = send_data_in(qp, &hdr, sizeof(hdr));
 793                        if (err)
 794                                return err;
 795                }
 796                err = send_data_in(qp, payload_addr(pkt), payload_size(pkt));
 797                if (err)
 798                        return err;
 799        } else if (pkt->mask & RXE_WRITE_MASK) {
 800                err = write_data_in(qp, pkt);
 801                if (err)
 802                        return err;
 803        } else if (pkt->mask & RXE_READ_MASK) {
 804                /* For RDMA Read we can increment the msn now. See C9-148. */
 805                qp->resp.msn++;
 806                return RESPST_READ_REPLY;
 807        } else if (pkt->mask & RXE_ATOMIC_MASK) {
 808                err = process_atomic(qp, pkt);
 809                if (err)
 810                        return err;
 811        } else {
 812                /* Unreachable */
 813                WARN_ON_ONCE(1);
 814        }
 815
 816        /* next expected psn, read handles this separately */
 817        qp->resp.psn = (pkt->psn + 1) & BTH_PSN_MASK;
 818
 819        qp->resp.opcode = pkt->opcode;
 820        qp->resp.status = IB_WC_SUCCESS;
 821
 822        if (pkt->mask & RXE_COMP_MASK) {
 823                /* We successfully processed this new request. */
 824                qp->resp.msn++;
 825                return RESPST_COMPLETE;
 826        } else if (qp_type(qp) == IB_QPT_RC)
 827                return RESPST_ACKNOWLEDGE;
 828        else
 829                return RESPST_CLEANUP;
 830}
 831
 832static enum resp_states do_complete(struct rxe_qp *qp,
 833                                    struct rxe_pkt_info *pkt)
 834{
 835        struct rxe_cqe cqe;
 836        struct ib_wc *wc = &cqe.ibwc;
 837        struct ib_uverbs_wc *uwc = &cqe.uibwc;
 838        struct rxe_recv_wqe *wqe = qp->resp.wqe;
 839
 840        if (unlikely(!wqe))
 841                return RESPST_CLEANUP;
 842
 843        memset(&cqe, 0, sizeof(cqe));
 844
 845        wc->wr_id               = wqe->wr_id;
 846        wc->status              = qp->resp.status;
 847        wc->qp                  = &qp->ibqp;
 848
 849        /* fields after status are not required for errors */
 850        if (wc->status == IB_WC_SUCCESS) {
 851                wc->opcode = (pkt->mask & RXE_IMMDT_MASK &&
 852                                pkt->mask & RXE_WRITE_MASK) ?
 853                                        IB_WC_RECV_RDMA_WITH_IMM : IB_WC_RECV;
 854                wc->vendor_err = 0;
 855                wc->byte_len = wqe->dma.length - wqe->dma.resid;
 856
 857                /* fields after byte_len are different between kernel and user
 858                 * space
 859                 */
 860                if (qp->rcq->is_user) {
 861                        uwc->wc_flags = IB_WC_GRH;
 862
 863                        if (pkt->mask & RXE_IMMDT_MASK) {
 864                                uwc->wc_flags |= IB_WC_WITH_IMM;
 865                                uwc->ex.imm_data = immdt_imm(pkt);
 866                        }
 867
 868                        if (pkt->mask & RXE_IETH_MASK) {
 869                                uwc->wc_flags |= IB_WC_WITH_INVALIDATE;
 870                                uwc->ex.invalidate_rkey = ieth_rkey(pkt);
 871                        }
 872
 873                        uwc->qp_num             = qp->ibqp.qp_num;
 874
 875                        if (pkt->mask & RXE_DETH_MASK)
 876                                uwc->src_qp = deth_sqp(pkt);
 877
 878                        uwc->port_num           = qp->attr.port_num;
 879                } else {
 880                        struct sk_buff *skb = PKT_TO_SKB(pkt);
 881
 882                        wc->wc_flags = IB_WC_GRH | IB_WC_WITH_NETWORK_HDR_TYPE;
 883                        if (skb->protocol == htons(ETH_P_IP))
 884                                wc->network_hdr_type = RDMA_NETWORK_IPV4;
 885                        else
 886                                wc->network_hdr_type = RDMA_NETWORK_IPV6;
 887
 888                        if (pkt->mask & RXE_IMMDT_MASK) {
 889                                wc->wc_flags |= IB_WC_WITH_IMM;
 890                                wc->ex.imm_data = immdt_imm(pkt);
 891                        }
 892
 893                        if (pkt->mask & RXE_IETH_MASK) {
 894                                struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
 895                                struct rxe_mem *rmr;
 896
 897                                wc->wc_flags |= IB_WC_WITH_INVALIDATE;
 898                                wc->ex.invalidate_rkey = ieth_rkey(pkt);
 899
 900                                rmr = rxe_pool_get_index(&rxe->mr_pool,
 901                                                         wc->ex.invalidate_rkey >> 8);
 902                                if (unlikely(!rmr)) {
 903                                        pr_err("Bad rkey %#x invalidation\n",
 904                                               wc->ex.invalidate_rkey);
 905                                        return RESPST_ERROR;
 906                                }
 907                                rmr->state = RXE_MEM_STATE_FREE;
 908                                rxe_drop_ref(rmr);
 909                        }
 910
 911                        wc->qp                  = &qp->ibqp;
 912
 913                        if (pkt->mask & RXE_DETH_MASK)
 914                                wc->src_qp = deth_sqp(pkt);
 915
 916                        wc->port_num            = qp->attr.port_num;
 917                }
 918        }
 919
 920        /* have copy for srq and reference for !srq */
 921        if (!qp->srq)
 922                advance_consumer(qp->rq.queue);
 923
 924        qp->resp.wqe = NULL;
 925
 926        if (rxe_cq_post(qp->rcq, &cqe, pkt ? bth_se(pkt) : 1))
 927                return RESPST_ERR_CQ_OVERFLOW;
 928
 929        if (qp->resp.state == QP_STATE_ERROR)
 930                return RESPST_CHK_RESOURCE;
 931
 932        if (!pkt)
 933                return RESPST_DONE;
 934        else if (qp_type(qp) == IB_QPT_RC)
 935                return RESPST_ACKNOWLEDGE;
 936        else
 937                return RESPST_CLEANUP;
 938}
 939
 940static int send_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
 941                    u8 syndrome, u32 psn)
 942{
 943        int err = 0;
 944        struct rxe_pkt_info ack_pkt;
 945        struct sk_buff *skb;
 946        struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
 947
 948        skb = prepare_ack_packet(qp, pkt, &ack_pkt, IB_OPCODE_RC_ACKNOWLEDGE,
 949                                 0, psn, syndrome, NULL);
 950        if (!skb) {
 951                err = -ENOMEM;
 952                goto err1;
 953        }
 954
 955        err = rxe_xmit_packet(rxe, qp, &ack_pkt, skb);
 956        if (err)
 957                pr_err_ratelimited("Failed sending ack\n");
 958
 959err1:
 960        return err;
 961}
 962
 963static int send_atomic_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
 964                           u8 syndrome)
 965{
 966        int rc = 0;
 967        struct rxe_pkt_info ack_pkt;
 968        struct sk_buff *skb;
 969        struct sk_buff *skb_copy;
 970        struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
 971        struct resp_res *res;
 972
 973        skb = prepare_ack_packet(qp, pkt, &ack_pkt,
 974                                 IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE, 0, pkt->psn,
 975                                 syndrome, NULL);
 976        if (!skb) {
 977                rc = -ENOMEM;
 978                goto out;
 979        }
 980
 981        skb_copy = skb_clone(skb, GFP_ATOMIC);
 982        if (skb_copy)
 983                rxe_add_ref(qp); /* for the new SKB */
 984        else {
 985                pr_warn("Could not clone atomic response\n");
 986                rc = -ENOMEM;
 987                goto out;
 988        }
 989
 990        res = &qp->resp.resources[qp->resp.res_head];
 991        free_rd_atomic_resource(qp, res);
 992        rxe_advance_resp_resource(qp);
 993
 994        memcpy(SKB_TO_PKT(skb), &ack_pkt, sizeof(ack_pkt));
 995        memset((unsigned char *)SKB_TO_PKT(skb) + sizeof(ack_pkt), 0,
 996               sizeof(skb->cb) - sizeof(ack_pkt));
 997
 998        res->type = RXE_ATOMIC_MASK;
 999        res->atomic.skb = skb;
1000        res->first_psn = ack_pkt.psn;
1001        res->last_psn  = ack_pkt.psn;
1002        res->cur_psn   = ack_pkt.psn;
1003
1004        rc = rxe_xmit_packet(rxe, qp, &ack_pkt, skb_copy);
1005        if (rc) {
1006                pr_err_ratelimited("Failed sending ack\n");
1007                rxe_drop_ref(qp);
1008                kfree_skb(skb_copy);
1009        }
1010
1011out:
1012        return rc;
1013}
1014
1015static enum resp_states acknowledge(struct rxe_qp *qp,
1016                                    struct rxe_pkt_info *pkt)
1017{
1018        if (qp_type(qp) != IB_QPT_RC)
1019                return RESPST_CLEANUP;
1020
1021        if (qp->resp.aeth_syndrome != AETH_ACK_UNLIMITED)
1022                send_ack(qp, pkt, qp->resp.aeth_syndrome, pkt->psn);
1023        else if (pkt->mask & RXE_ATOMIC_MASK)
1024                send_atomic_ack(qp, pkt, AETH_ACK_UNLIMITED);
1025        else if (bth_ack(pkt))
1026                send_ack(qp, pkt, AETH_ACK_UNLIMITED, pkt->psn);
1027
1028        return RESPST_CLEANUP;
1029}
1030
1031static enum resp_states cleanup(struct rxe_qp *qp,
1032                                struct rxe_pkt_info *pkt)
1033{
1034        struct sk_buff *skb;
1035
1036        if (pkt) {
1037                skb = skb_dequeue(&qp->req_pkts);
1038                rxe_drop_ref(qp);
1039                kfree_skb(skb);
1040        }
1041
1042        if (qp->resp.mr) {
1043                rxe_drop_ref(qp->resp.mr);
1044                qp->resp.mr = NULL;
1045        }
1046
1047        return RESPST_DONE;
1048}
1049
1050static struct resp_res *find_resource(struct rxe_qp *qp, u32 psn)
1051{
1052        int i;
1053
1054        for (i = 0; i < qp->attr.max_dest_rd_atomic; i++) {
1055                struct resp_res *res = &qp->resp.resources[i];
1056
1057                if (res->type == 0)
1058                        continue;
1059
1060                if (psn_compare(psn, res->first_psn) >= 0 &&
1061                    psn_compare(psn, res->last_psn) <= 0) {
1062                        return res;
1063                }
1064        }
1065
1066        return NULL;
1067}
1068
1069static enum resp_states duplicate_request(struct rxe_qp *qp,
1070                                          struct rxe_pkt_info *pkt)
1071{
1072        enum resp_states rc;
1073        u32 prev_psn = (qp->resp.psn - 1) & BTH_PSN_MASK;
1074
1075        if (pkt->mask & RXE_SEND_MASK ||
1076            pkt->mask & RXE_WRITE_MASK) {
1077                /* SEND. Ack again and cleanup. C9-105. */
1078                if (bth_ack(pkt))
1079                        send_ack(qp, pkt, AETH_ACK_UNLIMITED, prev_psn);
1080                rc = RESPST_CLEANUP;
1081                goto out;
1082        } else if (pkt->mask & RXE_READ_MASK) {
1083                struct resp_res *res;
1084
1085                res = find_resource(qp, pkt->psn);
1086                if (!res) {
1087                        /* Resource not found. Class D error.  Drop the
1088                         * request.
1089                         */
1090                        rc = RESPST_CLEANUP;
1091                        goto out;
1092                } else {
1093                        /* Ensure this new request is the same as the previous
1094                         * one or a subset of it.
1095                         */
1096                        u64 iova = reth_va(pkt);
1097                        u32 resid = reth_len(pkt);
1098
1099                        if (iova < res->read.va_org ||
1100                            resid > res->read.length ||
1101                            (iova + resid) > (res->read.va_org +
1102                                              res->read.length)) {
1103                                rc = RESPST_CLEANUP;
1104                                goto out;
1105                        }
1106
1107                        if (reth_rkey(pkt) != res->read.rkey) {
1108                                rc = RESPST_CLEANUP;
1109                                goto out;
1110                        }
1111
1112                        res->cur_psn = pkt->psn;
1113                        res->state = (pkt->psn == res->first_psn) ?
1114                                        rdatm_res_state_new :
1115                                        rdatm_res_state_replay;
1116
1117                        /* Reset the resource, except length. */
1118                        res->read.va_org = iova;
1119                        res->read.va = iova;
1120                        res->read.resid = resid;
1121
1122                        /* Replay the RDMA read reply. */
1123                        qp->resp.res = res;
1124                        rc = RESPST_READ_REPLY;
1125                        goto out;
1126                }
1127        } else {
1128                struct resp_res *res;
1129
1130                /* Find the operation in our list of responder resources. */
1131                res = find_resource(qp, pkt->psn);
1132                if (res) {
1133                        struct sk_buff *skb_copy;
1134
1135                        skb_copy = skb_clone(res->atomic.skb, GFP_ATOMIC);
1136                        if (skb_copy) {
1137                                rxe_add_ref(qp); /* for the new SKB */
1138                        } else {
1139                                pr_warn("Couldn't clone atomic resp\n");
1140                                rc = RESPST_CLEANUP;
1141                                goto out;
1142                        }
1143
1144                        /* Resend the result. */
1145                        rc = rxe_xmit_packet(to_rdev(qp->ibqp.device), qp,
1146                                             pkt, skb_copy);
1147                        if (rc) {
1148                                pr_err("Failed resending result. This flow is not handled - skb ignored\n");
1149                                rxe_drop_ref(qp);
1150                                rc = RESPST_CLEANUP;
1151                                goto out;
1152                        }
1153                }
1154
1155                /* Resource not found. Class D error. Drop the request. */
1156                rc = RESPST_CLEANUP;
1157                goto out;
1158        }
1159out:
1160        return rc;
1161}
1162
1163/* Process a class A or C. Both are treated the same in this implementation. */
1164static void do_class_ac_error(struct rxe_qp *qp, u8 syndrome,
1165                              enum ib_wc_status status)
1166{
1167        qp->resp.aeth_syndrome  = syndrome;
1168        qp->resp.status         = status;
1169
1170        /* indicate that we should go through the ERROR state */
1171        qp->resp.goto_error     = 1;
1172}
1173
1174static enum resp_states do_class_d1e_error(struct rxe_qp *qp)
1175{
1176        /* UC */
1177        if (qp->srq) {
1178                /* Class E */
1179                qp->resp.drop_msg = 1;
1180                if (qp->resp.wqe) {
1181                        qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1182                        return RESPST_COMPLETE;
1183                } else {
1184                        return RESPST_CLEANUP;
1185                }
1186        } else {
1187                /* Class D1. This packet may be the start of a
1188                 * new message and could be valid. The previous
1189                 * message is invalid and ignored. reset the
1190                 * recv wr to its original state
1191                 */
1192                if (qp->resp.wqe) {
1193                        qp->resp.wqe->dma.resid = qp->resp.wqe->dma.length;
1194                        qp->resp.wqe->dma.cur_sge = 0;
1195                        qp->resp.wqe->dma.sge_offset = 0;
1196                        qp->resp.opcode = -1;
1197                }
1198
1199                if (qp->resp.mr) {
1200                        rxe_drop_ref(qp->resp.mr);
1201                        qp->resp.mr = NULL;
1202                }
1203
1204                return RESPST_CLEANUP;
1205        }
1206}
1207
1208static void rxe_drain_req_pkts(struct rxe_qp *qp, bool notify)
1209{
1210        struct sk_buff *skb;
1211
1212        while ((skb = skb_dequeue(&qp->req_pkts))) {
1213                rxe_drop_ref(qp);
1214                kfree_skb(skb);
1215        }
1216
1217        if (notify)
1218                return;
1219
1220        while (!qp->srq && qp->rq.queue && queue_head(qp->rq.queue))
1221                advance_consumer(qp->rq.queue);
1222}
1223
1224int rxe_responder(void *arg)
1225{
1226        struct rxe_qp *qp = (struct rxe_qp *)arg;
1227        struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
1228        enum resp_states state;
1229        struct rxe_pkt_info *pkt = NULL;
1230        int ret = 0;
1231
1232        rxe_add_ref(qp);
1233
1234        qp->resp.aeth_syndrome = AETH_ACK_UNLIMITED;
1235
1236        if (!qp->valid) {
1237                ret = -EINVAL;
1238                goto done;
1239        }
1240
1241        switch (qp->resp.state) {
1242        case QP_STATE_RESET:
1243                state = RESPST_RESET;
1244                break;
1245
1246        default:
1247                state = RESPST_GET_REQ;
1248                break;
1249        }
1250
1251        while (1) {
1252                pr_debug("qp#%d state = %s\n", qp_num(qp),
1253                         resp_state_name[state]);
1254                switch (state) {
1255                case RESPST_GET_REQ:
1256                        state = get_req(qp, &pkt);
1257                        break;
1258                case RESPST_CHK_PSN:
1259                        state = check_psn(qp, pkt);
1260                        break;
1261                case RESPST_CHK_OP_SEQ:
1262                        state = check_op_seq(qp, pkt);
1263                        break;
1264                case RESPST_CHK_OP_VALID:
1265                        state = check_op_valid(qp, pkt);
1266                        break;
1267                case RESPST_CHK_RESOURCE:
1268                        state = check_resource(qp, pkt);
1269                        break;
1270                case RESPST_CHK_LENGTH:
1271                        state = check_length(qp, pkt);
1272                        break;
1273                case RESPST_CHK_RKEY:
1274                        state = check_rkey(qp, pkt);
1275                        break;
1276                case RESPST_EXECUTE:
1277                        state = execute(qp, pkt);
1278                        break;
1279                case RESPST_COMPLETE:
1280                        state = do_complete(qp, pkt);
1281                        break;
1282                case RESPST_READ_REPLY:
1283                        state = read_reply(qp, pkt);
1284                        break;
1285                case RESPST_ACKNOWLEDGE:
1286                        state = acknowledge(qp, pkt);
1287                        break;
1288                case RESPST_CLEANUP:
1289                        state = cleanup(qp, pkt);
1290                        break;
1291                case RESPST_DUPLICATE_REQUEST:
1292                        state = duplicate_request(qp, pkt);
1293                        break;
1294                case RESPST_ERR_PSN_OUT_OF_SEQ:
1295                        /* RC only - Class B. Drop packet. */
1296                        send_ack(qp, pkt, AETH_NAK_PSN_SEQ_ERROR, qp->resp.psn);
1297                        state = RESPST_CLEANUP;
1298                        break;
1299
1300                case RESPST_ERR_TOO_MANY_RDMA_ATM_REQ:
1301                case RESPST_ERR_MISSING_OPCODE_FIRST:
1302                case RESPST_ERR_MISSING_OPCODE_LAST_C:
1303                case RESPST_ERR_UNSUPPORTED_OPCODE:
1304                case RESPST_ERR_MISALIGNED_ATOMIC:
1305                        /* RC Only - Class C. */
1306                        do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1307                                          IB_WC_REM_INV_REQ_ERR);
1308                        state = RESPST_COMPLETE;
1309                        break;
1310
1311                case RESPST_ERR_MISSING_OPCODE_LAST_D1E:
1312                        state = do_class_d1e_error(qp);
1313                        break;
1314                case RESPST_ERR_RNR:
1315                        if (qp_type(qp) == IB_QPT_RC) {
1316                                rxe_counter_inc(rxe, RXE_CNT_SND_RNR);
1317                                /* RC - class B */
1318                                send_ack(qp, pkt, AETH_RNR_NAK |
1319                                         (~AETH_TYPE_MASK &
1320                                         qp->attr.min_rnr_timer),
1321                                         pkt->psn);
1322                        } else {
1323                                /* UD/UC - class D */
1324                                qp->resp.drop_msg = 1;
1325                        }
1326                        state = RESPST_CLEANUP;
1327                        break;
1328
1329                case RESPST_ERR_RKEY_VIOLATION:
1330                        if (qp_type(qp) == IB_QPT_RC) {
1331                                /* Class C */
1332                                do_class_ac_error(qp, AETH_NAK_REM_ACC_ERR,
1333                                                  IB_WC_REM_ACCESS_ERR);
1334                                state = RESPST_COMPLETE;
1335                        } else {
1336                                qp->resp.drop_msg = 1;
1337                                if (qp->srq) {
1338                                        /* UC/SRQ Class D */
1339                                        qp->resp.status = IB_WC_REM_ACCESS_ERR;
1340                                        state = RESPST_COMPLETE;
1341                                } else {
1342                                        /* UC/non-SRQ Class E. */
1343                                        state = RESPST_CLEANUP;
1344                                }
1345                        }
1346                        break;
1347
1348                case RESPST_ERR_LENGTH:
1349                        if (qp_type(qp) == IB_QPT_RC) {
1350                                /* Class C */
1351                                do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1352                                                  IB_WC_REM_INV_REQ_ERR);
1353                                state = RESPST_COMPLETE;
1354                        } else if (qp->srq) {
1355                                /* UC/UD - class E */
1356                                qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1357                                state = RESPST_COMPLETE;
1358                        } else {
1359                                /* UC/UD - class D */
1360                                qp->resp.drop_msg = 1;
1361                                state = RESPST_CLEANUP;
1362                        }
1363                        break;
1364
1365                case RESPST_ERR_MALFORMED_WQE:
1366                        /* All, Class A. */
1367                        do_class_ac_error(qp, AETH_NAK_REM_OP_ERR,
1368                                          IB_WC_LOC_QP_OP_ERR);
1369                        state = RESPST_COMPLETE;
1370                        break;
1371
1372                case RESPST_ERR_CQ_OVERFLOW:
1373                        /* All - Class G */
1374                        state = RESPST_ERROR;
1375                        break;
1376
1377                case RESPST_DONE:
1378                        if (qp->resp.goto_error) {
1379                                state = RESPST_ERROR;
1380                                break;
1381                        }
1382
1383                        goto done;
1384
1385                case RESPST_EXIT:
1386                        if (qp->resp.goto_error) {
1387                                state = RESPST_ERROR;
1388                                break;
1389                        }
1390
1391                        goto exit;
1392
1393                case RESPST_RESET:
1394                        rxe_drain_req_pkts(qp, false);
1395                        qp->resp.wqe = NULL;
1396                        goto exit;
1397
1398                case RESPST_ERROR:
1399                        qp->resp.goto_error = 0;
1400                        pr_warn("qp#%d moved to error state\n", qp_num(qp));
1401                        rxe_qp_error(qp);
1402                        goto exit;
1403
1404                default:
1405                        WARN_ON_ONCE(1);
1406                }
1407        }
1408
1409exit:
1410        ret = -EAGAIN;
1411done:
1412        rxe_drop_ref(qp);
1413        return ret;
1414}
1415