drivers/infiniband/hw/hfi1/uc.c

   1 /*
   2  * Copyright(c) 2015, 2016 Intel Corporation.
   3  *
   4  * This file is provided under a dual BSD/GPLv2 license.  When using or
   5  * redistributing this file, you may do so under either license.
   6  *
   7  * GPL LICENSE SUMMARY
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of version 2 of the GNU General Public License as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * BSD LICENSE
  19  *
  20  * Redistribution and use in source and binary forms, with or without
  21  * modification, are permitted provided that the following conditions
  22  * are met:
  23  *
  24  *  - Redistributions of source code must retain the above copyright
  25  *    notice, this list of conditions and the following disclaimer.
  26  *  - Redistributions in binary form must reproduce the above copyright
  27  *    notice, this list of conditions and the following disclaimer in
  28  *    the documentation and/or other materials provided with the
  29  *    distribution.
  30  *  - Neither the name of Intel Corporation nor the names of its
  31  *    contributors may be used to endorse or promote products derived
  32  *    from this software without specific prior written permission.
  33  *
  34  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  35  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  36  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  37  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  38  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  39  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  40  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  41  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  42  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  43  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  44  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  45  *
  46  */
  47
  48 #include "hfi.h"
  49 #include "verbs_txreq.h"
  50 #include "qp.h"
  51
  52 /* cut down ridiculously long IB macro names */
  53 #define OP(x) UC_OP(x)
  54
  55 /**
  56  * hfi1_make_uc_req - construct a request packet (SEND, RDMA write)
  57  * @qp: a pointer to the QP
  58  *
  59  * Assume s_lock is held.
  60  *
  61  * Return 1 if constructed; otherwise, return 0.
  62  */
  63 int hfi1_make_uc_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
  64 {
  65         struct hfi1_qp_priv *priv = qp->priv;
  66         struct ib_other_headers *ohdr;
  67         struct rvt_swqe *wqe;
  68         u32 hwords;
  69         u32 bth0 = 0;
  70         u32 len;
  71         u32 pmtu = qp->pmtu;
  72         int middle = 0;
  73
  74         ps->s_txreq = get_txreq(ps->dev, qp);
  75         if (IS_ERR(ps->s_txreq))
  76                 goto bail_no_tx;
  77
  78         if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_SEND_OK)) {
  79                 if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
  80                         goto bail;
  81                 /* We are in the error state, flush the work request. */
  82                 smp_read_barrier_depends(); /* see post_one_send() */
  83                 if (qp->s_last == ACCESS_ONCE(qp->s_head))
  84                         goto bail;
  85                 /* If DMAs are in progress, we can't flush immediately. */
  86                 if (iowait_sdma_pending(&priv->s_iowait)) {
  87                         qp->s_flags |= RVT_S_WAIT_DMA;
  88                         goto bail;
  89                 }
  90                 clear_ahg(qp);
  91                 wqe = rvt_get_swqe_ptr(qp, qp->s_last);
  92                 hfi1_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
  93                 goto done_free_tx;
  94         }
  95
  96         ps->s_txreq->phdr.hdr.hdr_type = priv->hdr_type;
  97         if (priv->hdr_type == HFI1_PKT_TYPE_9B) {
  98                 /* header size in 32-bit words LRH+BTH = (8+12)/4. */
  99                 hwords = 5;
 100                 if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)
 101                         ohdr = &ps->s_txreq->phdr.hdr.ibh.u.l.oth;
 102                 else
 103                         ohdr = &ps->s_txreq->phdr.hdr.ibh.u.oth;
 104         } else {
 105                 /* header size in 32-bit words 16B LRH+BTH = (16+12)/4. */
 106                 hwords = 7;
 107                 if ((rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) &&
 108                     (hfi1_check_mcast(rdma_ah_get_dlid(&qp->remote_ah_attr))))
 109                         ohdr = &ps->s_txreq->phdr.hdr.opah.u.l.oth;
 110                 else
 111                         ohdr = &ps->s_txreq->phdr.hdr.opah.u.oth;
 112         }
 113
 114         /* Get the next send request. */
 115         wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
 116         qp->s_wqe = NULL;
 117         switch (qp->s_state) {
 118         default:
 119                 if (!(ib_rvt_state_ops[qp->state] &
 120                     RVT_PROCESS_NEXT_SEND_OK))
 121                         goto bail;
 122                 /* Check if send work queue is empty. */
 123                 smp_read_barrier_depends(); /* see post_one_send() */
 124                 if (qp->s_cur == ACCESS_ONCE(qp->s_head)) {
 125                         clear_ahg(qp);
 126                         goto bail;
 127                 }
 128                 /*
 129                  * Local operations are processed immediately
 130                  * after all prior requests have completed.
 131                  */
 132                 if (wqe->wr.opcode == IB_WR_REG_MR ||
 133                     wqe->wr.opcode == IB_WR_LOCAL_INV) {
 134                         int local_ops = 0;
 135                         int err = 0;
 136
 137                         if (qp->s_last != qp->s_cur)
 138                                 goto bail;
 139                         if (++qp->s_cur == qp->s_size)
 140                                 qp->s_cur = 0;
 141                         if (!(wqe->wr.send_flags & RVT_SEND_COMPLETION_ONLY)) {
 142                                 err = rvt_invalidate_rkey(
 143                                         qp, wqe->wr.ex.invalidate_rkey);
 144                                 local_ops = 1;
 145                         }
 146                         hfi1_send_complete(qp, wqe, err ? IB_WC_LOC_PROT_ERR
 147                                                         : IB_WC_SUCCESS);
 148                         if (local_ops)
 149                                 atomic_dec(&qp->local_ops_pending);
 150                         qp->s_hdrwords = 0;
 151                         goto done_free_tx;
 152                 }
 153                 /*
 154                  * Start a new request.
 155                  */
 156                 qp->s_psn = wqe->psn;
 157                 qp->s_sge.sge = wqe->sg_list[0];
 158                 qp->s_sge.sg_list = wqe->sg_list + 1;
 159                 qp->s_sge.num_sge = wqe->wr.num_sge;
 160                 qp->s_sge.total_len = wqe->length;
 161                 len = wqe->length;
 162                 qp->s_len = len;
 163                 switch (wqe->wr.opcode) {
 164                 case IB_WR_SEND:
 165                 case IB_WR_SEND_WITH_IMM:
 166                         if (len > pmtu) {
 167                                 qp->s_state = OP(SEND_FIRST);
 168                                 len = pmtu;
 169                                 break;
 170                         }
 171                         if (wqe->wr.opcode == IB_WR_SEND) {
 172                                 qp->s_state = OP(SEND_ONLY);
 173                         } else {
 174                                 qp->s_state =
 175                                         OP(SEND_ONLY_WITH_IMMEDIATE);
 176                                 /* Immediate data comes after the BTH */
 177                                 ohdr->u.imm_data = wqe->wr.ex.imm_data;
 178                                 hwords += 1;
 179                         }
 180                         if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 181                                 bth0 |= IB_BTH_SOLICITED;
 182                         qp->s_wqe = wqe;
 183                         if (++qp->s_cur >= qp->s_size)
 184                                 qp->s_cur = 0;
 185                         break;
 186
 187                 case IB_WR_RDMA_WRITE:
 188                 case IB_WR_RDMA_WRITE_WITH_IMM:
 189                         ohdr->u.rc.reth.vaddr =
 190                                 cpu_to_be64(wqe->rdma_wr.remote_addr);
 191                         ohdr->u.rc.reth.rkey =
 192                                 cpu_to_be32(wqe->rdma_wr.rkey);
 193                         ohdr->u.rc.reth.length = cpu_to_be32(len);
 194                         hwords += sizeof(struct ib_reth) / 4;
 195                         if (len > pmtu) {
 196                                 qp->s_state = OP(RDMA_WRITE_FIRST);
 197                                 len = pmtu;
 198                                 break;
 199                         }
 200                         if (wqe->wr.opcode == IB_WR_RDMA_WRITE) {
 201                                 qp->s_state = OP(RDMA_WRITE_ONLY);
 202                         } else {
 203                                 qp->s_state =
 204                                         OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE);
 205                                 /* Immediate data comes after the RETH */
 206                                 ohdr->u.rc.imm_data = wqe->wr.ex.imm_data;
 207                                 hwords += 1;
 208                                 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 209                                         bth0 |= IB_BTH_SOLICITED;
 210                         }
 211                         qp->s_wqe = wqe;
 212                         if (++qp->s_cur >= qp->s_size)
 213                                 qp->s_cur = 0;
 214                         break;
 215
 216                 default:
 217                         goto bail;
 218                 }
 219                 break;
 220
 221         case OP(SEND_FIRST):
 222                 qp->s_state = OP(SEND_MIDDLE);
 223                 /* FALLTHROUGH */
 224         case OP(SEND_MIDDLE):
 225                 len = qp->s_len;
 226                 if (len > pmtu) {
 227                         len = pmtu;
 228                         middle = HFI1_CAP_IS_KSET(SDMA_AHG);
 229                         break;
 230                 }
 231                 if (wqe->wr.opcode == IB_WR_SEND) {
 232                         qp->s_state = OP(SEND_LAST);
 233                 } else {
 234                         qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE);
 235                         /* Immediate data comes after the BTH */
 236                         ohdr->u.imm_data = wqe->wr.ex.imm_data;
 237                         hwords += 1;
 238                 }
 239                 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 240                         bth0 |= IB_BTH_SOLICITED;
 241                 qp->s_wqe = wqe;
 242                 if (++qp->s_cur >= qp->s_size)
 243                         qp->s_cur = 0;
 244                 break;
 245
 246         case OP(RDMA_WRITE_FIRST):
 247                 qp->s_state = OP(RDMA_WRITE_MIDDLE);
 248                 /* FALLTHROUGH */
 249         case OP(RDMA_WRITE_MIDDLE):
 250                 len = qp->s_len;
 251                 if (len > pmtu) {
 252                         len = pmtu;
 253                         middle = HFI1_CAP_IS_KSET(SDMA_AHG);
 254                         break;
 255                 }
 256                 if (wqe->wr.opcode == IB_WR_RDMA_WRITE) {
 257                         qp->s_state = OP(RDMA_WRITE_LAST);
 258                 } else {
 259                         qp->s_state =
 260                                 OP(RDMA_WRITE_LAST_WITH_IMMEDIATE);
 261                         /* Immediate data comes after the BTH */
 262                         ohdr->u.imm_data = wqe->wr.ex.imm_data;
 263                         hwords += 1;
 264                         if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 265                                 bth0 |= IB_BTH_SOLICITED;
 266                 }
 267                 qp->s_wqe = wqe;
 268                 if (++qp->s_cur >= qp->s_size)
 269                         qp->s_cur = 0;
 270                 break;
 271         }
 272         qp->s_len -= len;
 273         qp->s_hdrwords = hwords;
 274         ps->s_txreq->sde = priv->s_sde;
 275         ps->s_txreq->ss = &qp->s_sge;
 276         ps->s_txreq->s_cur_size = len;
 277         hfi1_make_ruc_header(qp, ohdr, bth0 | (qp->s_state << 24),
 278                              mask_psn(qp->s_psn++), middle, ps);
 279         /* pbc */
 280         ps->s_txreq->hdr_dwords = qp->s_hdrwords + 2;
 281         return 1;
 282
 283 done_free_tx:
 284         hfi1_put_txreq(ps->s_txreq);
 285         ps->s_txreq = NULL;
 286         return 1;
 287
 288 bail:
 289         hfi1_put_txreq(ps->s_txreq);
 290
 291 bail_no_tx:
 292         ps->s_txreq = NULL;
 293         qp->s_flags &= ~RVT_S_BUSY;
 294         qp->s_hdrwords = 0;
 295         return 0;
 296 }
 297
 298 /**
 299  * hfi1_uc_rcv - handle an incoming UC packet
 300  * @ibp: the port the packet came in on
 301  * @hdr: the header of the packet
 302  * @rcv_flags: flags relevant to rcv processing
 303  * @data: the packet data
 304  * @tlen: the length of the packet
 305  * @qp: the QP for this packet.
 306  *
 307  * This is called from qp_rcv() to process an incoming UC packet
 308  * for the given QP.
 309  * Called at interrupt level.
 310  */
 311 void hfi1_uc_rcv(struct hfi1_packet *packet)
 312 {
 313         struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd);
 314         void *data = packet->payload;
 315         u32 tlen = packet->tlen;
 316         struct rvt_qp *qp = packet->qp;
 317         struct ib_other_headers *ohdr = packet->ohdr;
 318         u32 opcode = packet->opcode;
 319         u32 hdrsize = packet->hlen;
 320         u32 psn;
 321         u32 pad = packet->pad;
 322         struct ib_wc wc;
 323         u32 pmtu = qp->pmtu;
 324         struct ib_reth *reth;
 325         int ret;
 326         u8 extra_bytes = pad + packet->extra_byte + (SIZE_OF_CRC << 2);
 327
 328         if (hfi1_ruc_check_hdr(ibp, packet))
 329                 return;
 330
 331         process_ecn(qp, packet, true);
 332
 333         psn = ib_bth_get_psn(ohdr);
 334         /* Compare the PSN verses the expected PSN. */
 335         if (unlikely(cmp_psn(psn, qp->r_psn) != 0)) {
 336                 /*
 337                  * Handle a sequence error.
 338                  * Silently drop any current message.
 339                  */
 340                 qp->r_psn = psn;
 341 inv:
 342                 if (qp->r_state == OP(SEND_FIRST) ||
 343                     qp->r_state == OP(SEND_MIDDLE)) {
 344                         set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
 345                         qp->r_sge.num_sge = 0;
 346                 } else {
 347                         rvt_put_ss(&qp->r_sge);
 348                 }
 349                 qp->r_state = OP(SEND_LAST);
 350                 switch (opcode) {
 351                 case OP(SEND_FIRST):
 352                 case OP(SEND_ONLY):
 353                 case OP(SEND_ONLY_WITH_IMMEDIATE):
 354                         goto send_first;
 355
 356                 case OP(RDMA_WRITE_FIRST):
 357                 case OP(RDMA_WRITE_ONLY):
 358                 case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE):
 359                         goto rdma_first;
 360
 361                 default:
 362                         goto drop;
 363                 }
 364         }
 365
 366         /* Check for opcode sequence errors. */
 367         switch (qp->r_state) {
 368         case OP(SEND_FIRST):
 369         case OP(SEND_MIDDLE):
 370                 if (opcode == OP(SEND_MIDDLE) ||
 371                     opcode == OP(SEND_LAST) ||
 372                     opcode == OP(SEND_LAST_WITH_IMMEDIATE))
 373                         break;
 374                 goto inv;
 375
 376         case OP(RDMA_WRITE_FIRST):
 377         case OP(RDMA_WRITE_MIDDLE):
 378                 if (opcode == OP(RDMA_WRITE_MIDDLE) ||
 379                     opcode == OP(RDMA_WRITE_LAST) ||
 380                     opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
 381                         break;
 382                 goto inv;
 383
 384         default:
 385                 if (opcode == OP(SEND_FIRST) ||
 386                     opcode == OP(SEND_ONLY) ||
 387                     opcode == OP(SEND_ONLY_WITH_IMMEDIATE) ||
 388                     opcode == OP(RDMA_WRITE_FIRST) ||
 389                     opcode == OP(RDMA_WRITE_ONLY) ||
 390                     opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
 391                         break;
 392                 goto inv;
 393         }
 394
 395         if (qp->state == IB_QPS_RTR && !(qp->r_flags & RVT_R_COMM_EST))
 396                 rvt_comm_est(qp);
 397
 398         /* OK, process the packet. */
 399         switch (opcode) {
 400         case OP(SEND_FIRST):
 401         case OP(SEND_ONLY):
 402         case OP(SEND_ONLY_WITH_IMMEDIATE):
 403 send_first:
 404                 if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags)) {
 405                         qp->r_sge = qp->s_rdma_read_sge;
 406                 } else {
 407                         ret = hfi1_rvt_get_rwqe(qp, 0);
 408                         if (ret < 0)
 409                                 goto op_err;
 410                         if (!ret)
 411                                 goto drop;
 412                         /*
 413                          * qp->s_rdma_read_sge will be the owner
 414                          * of the mr references.
 415                          */
 416                         qp->s_rdma_read_sge = qp->r_sge;
 417                 }
 418                 qp->r_rcv_len = 0;
 419                 if (opcode == OP(SEND_ONLY))
 420                         goto no_immediate_data;
 421                 else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE))
 422                         goto send_last_imm;
 423                 /* FALLTHROUGH */
 424         case OP(SEND_MIDDLE):
 425                 /* Check for invalid length PMTU or posted rwqe len. */
 426                 /*
 427                  * There will be no padding for 9B packet but 16B packets
 428                  * will come in with some padding since we always add
 429                  * CRC and LT bytes which will need to be flit aligned
 430                  */
 431                 if (unlikely(tlen != (hdrsize + pmtu + extra_bytes)))
 432                         goto rewind;
 433                 qp->r_rcv_len += pmtu;
 434                 if (unlikely(qp->r_rcv_len > qp->r_len))
 435                         goto rewind;
 436                 hfi1_copy_sge(&qp->r_sge, data, pmtu, false, false);
 437                 break;
 438
 439         case OP(SEND_LAST_WITH_IMMEDIATE):
 440 send_last_imm:
 441                 wc.ex.imm_data = ohdr->u.imm_data;
 442                 wc.wc_flags = IB_WC_WITH_IMM;
 443                 goto send_last;
 444         case OP(SEND_LAST):
 445 no_immediate_data:
 446                 wc.ex.imm_data = 0;
 447                 wc.wc_flags = 0;
 448 send_last:
 449                 /* Check for invalid length. */
 450                 /* LAST len should be >= 1 */
 451                 if (unlikely(tlen < (hdrsize + extra_bytes)))
 452                         goto rewind;
 453                 /* Don't count the CRC. */
 454                 tlen -= (hdrsize + extra_bytes);
 455                 wc.byte_len = tlen + qp->r_rcv_len;
 456                 if (unlikely(wc.byte_len > qp->r_len))
 457                         goto rewind;
 458                 wc.opcode = IB_WC_RECV;
 459                 hfi1_copy_sge(&qp->r_sge, data, tlen, false, false);
 460                 rvt_put_ss(&qp->s_rdma_read_sge);
 461 last_imm:
 462                 wc.wr_id = qp->r_wr_id;
 463                 wc.status = IB_WC_SUCCESS;
 464                 wc.qp = &qp->ibqp;
 465                 wc.src_qp = qp->remote_qpn;
 466                 wc.slid = rdma_ah_get_dlid(&qp->remote_ah_attr);
 467                 /*
 468                  * It seems that IB mandates the presence of an SL in a
 469                  * work completion only for the UD transport (see section
 470                  * 11.4.2 of IBTA Vol. 1).
 471                  *
 472                  * However, the way the SL is chosen below is consistent
 473                  * with the way that IB/qib works and is trying avoid
 474                  * introducing incompatibilities.
 475                  *
 476                  * See also OPA Vol. 1, section 9.7.6, and table 9-17.
 477                  */
 478                 wc.sl = rdma_ah_get_sl(&qp->remote_ah_attr);
 479                 /* zero fields that are N/A */
 480                 wc.vendor_err = 0;
 481                 wc.pkey_index = 0;
 482                 wc.dlid_path_bits = 0;
 483                 wc.port_num = 0;
 484                 /* Signal completion event if the solicited bit is set. */
 485                 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc,
 486                              (ohdr->bth[0] &
 487                               cpu_to_be32(IB_BTH_SOLICITED)) != 0);
 488                 break;
 489
 490         case OP(RDMA_WRITE_FIRST):
 491         case OP(RDMA_WRITE_ONLY):
 492         case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */
 493 rdma_first:
 494                 if (unlikely(!(qp->qp_access_flags &
 495                                IB_ACCESS_REMOTE_WRITE))) {
 496                         goto drop;
 497                 }
 498                 reth = &ohdr->u.rc.reth;
 499                 qp->r_len = be32_to_cpu(reth->length);
 500                 qp->r_rcv_len = 0;
 501                 qp->r_sge.sg_list = NULL;
 502                 if (qp->r_len != 0) {
 503                         u32 rkey = be32_to_cpu(reth->rkey);
 504                         u64 vaddr = be64_to_cpu(reth->vaddr);
 505                         int ok;
 506
 507                         /* Check rkey */
 508                         ok = rvt_rkey_ok(qp, &qp->r_sge.sge, qp->r_len,
 509                                          vaddr, rkey, IB_ACCESS_REMOTE_WRITE);
 510                         if (unlikely(!ok))
 511                                 goto drop;
 512                         qp->r_sge.num_sge = 1;
 513                 } else {
 514                         qp->r_sge.num_sge = 0;
 515                         qp->r_sge.sge.mr = NULL;
 516                         qp->r_sge.sge.vaddr = NULL;
 517                         qp->r_sge.sge.length = 0;
 518                         qp->r_sge.sge.sge_length = 0;
 519                 }
 520                 if (opcode == OP(RDMA_WRITE_ONLY)) {
 521                         goto rdma_last;
 522                 } else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) {
 523                         wc.ex.imm_data = ohdr->u.rc.imm_data;
 524                         goto rdma_last_imm;
 525                 }
 526                 /* FALLTHROUGH */
 527         case OP(RDMA_WRITE_MIDDLE):
 528                 /* Check for invalid length PMTU or posted rwqe len. */
 529                 if (unlikely(tlen != (hdrsize + pmtu + 4)))
 530                         goto drop;
 531                 qp->r_rcv_len += pmtu;
 532                 if (unlikely(qp->r_rcv_len > qp->r_len))
 533                         goto drop;
 534                 hfi1_copy_sge(&qp->r_sge, data, pmtu, true, false);
 535                 break;
 536
 537         case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
 538                 wc.ex.imm_data = ohdr->u.imm_data;
 539 rdma_last_imm:
 540                 wc.wc_flags = IB_WC_WITH_IMM;
 541
 542                 /* Check for invalid length. */
 543                 /* LAST len should be >= 1 */
 544                 if (unlikely(tlen < (hdrsize + pad + 4)))
 545                         goto drop;
 546                 /* Don't count the CRC. */
 547                 tlen -= (hdrsize + extra_bytes);
 548                 if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
 549                         goto drop;
 550                 if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags)) {
 551                         rvt_put_ss(&qp->s_rdma_read_sge);
 552                 } else {
 553                         ret = hfi1_rvt_get_rwqe(qp, 1);
 554                         if (ret < 0)
 555                                 goto op_err;
 556                         if (!ret)
 557                                 goto drop;
 558                 }
 559                 wc.byte_len = qp->r_len;
 560                 wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
 561                 hfi1_copy_sge(&qp->r_sge, data, tlen, true, false);
 562                 rvt_put_ss(&qp->r_sge);
 563                 goto last_imm;
 564
 565         case OP(RDMA_WRITE_LAST):
 566 rdma_last:
 567                 /* Check for invalid length. */
 568                 /* LAST len should be >= 1 */
 569                 if (unlikely(tlen < (hdrsize + pad + 4)))
 570                         goto drop;
 571                 /* Don't count the CRC. */
 572                 tlen -= (hdrsize + extra_bytes);
 573                 if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
 574                         goto drop;
 575                 hfi1_copy_sge(&qp->r_sge, data, tlen, true, false);
 576                 rvt_put_ss(&qp->r_sge);
 577                 break;
 578
 579         default:
 580                 /* Drop packet for unknown opcodes. */
 581                 goto drop;
 582         }
 583         qp->r_psn++;
 584         qp->r_state = opcode;
 585         return;
 586
 587 rewind:
 588         set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
 589         qp->r_sge.num_sge = 0;
 590 drop:
 591         ibp->rvp.n_pkt_drops++;
 592         return;
 593
 594 op_err:
 595         rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
 596 }