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) IB_OPCODE_UC_##x
  54
  55 /* only opcode mask for adaptive pio */
  56 const u32 uc_only_opcode =
  57         BIT(OP(SEND_ONLY) & 0x1f) |
  58         BIT(OP(SEND_ONLY_WITH_IMMEDIATE & 0x1f)) |
  59         BIT(OP(RDMA_WRITE_ONLY & 0x1f)) |
  60         BIT(OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE & 0x1f));
  61
  62 /**
  63  * hfi1_make_uc_req - construct a request packet (SEND, RDMA write)
  64  * @qp: a pointer to the QP
  65  *
  66  * Assume s_lock is held.
  67  *
  68  * Return 1 if constructed; otherwise, return 0.
  69  */
  70 int hfi1_make_uc_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
  71 {
  72         struct hfi1_qp_priv *priv = qp->priv;
  73         struct hfi1_other_headers *ohdr;
  74         struct rvt_swqe *wqe;
  75         u32 hwords = 5;
  76         u32 bth0 = 0;
  77         u32 len;
  78         u32 pmtu = qp->pmtu;
  79         int middle = 0;
  80
  81         ps->s_txreq = get_txreq(ps->dev, qp);
  82         if (IS_ERR(ps->s_txreq))
  83                 goto bail_no_tx;
  84
  85         if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_SEND_OK)) {
  86                 if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
  87                         goto bail;
  88                 /* We are in the error state, flush the work request. */
  89                 smp_read_barrier_depends(); /* see post_one_send() */
  90                 if (qp->s_last == ACCESS_ONCE(qp->s_head))
  91                         goto bail;
  92                 /* If DMAs are in progress, we can't flush immediately. */
  93                 if (iowait_sdma_pending(&priv->s_iowait)) {
  94                         qp->s_flags |= RVT_S_WAIT_DMA;
  95                         goto bail;
  96                 }
  97                 clear_ahg(qp);
  98                 wqe = rvt_get_swqe_ptr(qp, qp->s_last);
  99                 hfi1_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
 100                 goto done_free_tx;
 101         }
 102
 103         ohdr = &ps->s_txreq->phdr.hdr.u.oth;
 104         if (qp->remote_ah_attr.ah_flags & IB_AH_GRH)
 105                 ohdr = &ps->s_txreq->phdr.hdr.u.l.oth;
 106
 107         /* Get the next send request. */
 108         wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
 109         qp->s_wqe = NULL;
 110         switch (qp->s_state) {
 111         default:
 112                 if (!(ib_rvt_state_ops[qp->state] &
 113                     RVT_PROCESS_NEXT_SEND_OK))
 114                         goto bail;
 115                 /* Check if send work queue is empty. */
 116                 smp_read_barrier_depends(); /* see post_one_send() */
 117                 if (qp->s_cur == ACCESS_ONCE(qp->s_head)) {
 118                         clear_ahg(qp);
 119                         goto bail;
 120                 }
 121                 /*
 122                  * Local operations are processed immediately
 123                  * after all prior requests have completed.
 124                  */
 125                 if (wqe->wr.opcode == IB_WR_REG_MR ||
 126                     wqe->wr.opcode == IB_WR_LOCAL_INV) {
 127                         int local_ops = 0;
 128                         int err = 0;
 129
 130                         if (qp->s_last != qp->s_cur)
 131                                 goto bail;
 132                         if (++qp->s_cur == qp->s_size)
 133                                 qp->s_cur = 0;
 134                         if (!(wqe->wr.send_flags & RVT_SEND_COMPLETION_ONLY)) {
 135                                 err = rvt_invalidate_rkey(
 136                                         qp, wqe->wr.ex.invalidate_rkey);
 137                                 local_ops = 1;
 138                         }
 139                         hfi1_send_complete(qp, wqe, err ? IB_WC_LOC_PROT_ERR
 140                                                         : IB_WC_SUCCESS);
 141                         if (local_ops)
 142                                 atomic_dec(&qp->local_ops_pending);
 143                         qp->s_hdrwords = 0;
 144                         goto done_free_tx;
 145                 }
 146                 /*
 147                  * Start a new request.
 148                  */
 149                 qp->s_psn = wqe->psn;
 150                 qp->s_sge.sge = wqe->sg_list[0];
 151                 qp->s_sge.sg_list = wqe->sg_list + 1;
 152                 qp->s_sge.num_sge = wqe->wr.num_sge;
 153                 qp->s_sge.total_len = wqe->length;
 154                 len = wqe->length;
 155                 qp->s_len = len;
 156                 switch (wqe->wr.opcode) {
 157                 case IB_WR_SEND:
 158                 case IB_WR_SEND_WITH_IMM:
 159                         if (len > pmtu) {
 160                                 qp->s_state = OP(SEND_FIRST);
 161                                 len = pmtu;
 162                                 break;
 163                         }
 164                         if (wqe->wr.opcode == IB_WR_SEND) {
 165                                 qp->s_state = OP(SEND_ONLY);
 166                         } else {
 167                                 qp->s_state =
 168                                         OP(SEND_ONLY_WITH_IMMEDIATE);
 169                                 /* Immediate data comes after the BTH */
 170                                 ohdr->u.imm_data = wqe->wr.ex.imm_data;
 171                                 hwords += 1;
 172                         }
 173                         if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 174                                 bth0 |= IB_BTH_SOLICITED;
 175                         qp->s_wqe = wqe;
 176                         if (++qp->s_cur >= qp->s_size)
 177                                 qp->s_cur = 0;
 178                         break;
 179
 180                 case IB_WR_RDMA_WRITE:
 181                 case IB_WR_RDMA_WRITE_WITH_IMM:
 182                         ohdr->u.rc.reth.vaddr =
 183                                 cpu_to_be64(wqe->rdma_wr.remote_addr);
 184                         ohdr->u.rc.reth.rkey =
 185                                 cpu_to_be32(wqe->rdma_wr.rkey);
 186                         ohdr->u.rc.reth.length = cpu_to_be32(len);
 187                         hwords += sizeof(struct ib_reth) / 4;
 188                         if (len > pmtu) {
 189                                 qp->s_state = OP(RDMA_WRITE_FIRST);
 190                                 len = pmtu;
 191                                 break;
 192                         }
 193                         if (wqe->wr.opcode == IB_WR_RDMA_WRITE) {
 194                                 qp->s_state = OP(RDMA_WRITE_ONLY);
 195                         } else {
 196                                 qp->s_state =
 197                                         OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE);
 198                                 /* Immediate data comes after the RETH */
 199                                 ohdr->u.rc.imm_data = wqe->wr.ex.imm_data;
 200                                 hwords += 1;
 201                                 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 202                                         bth0 |= IB_BTH_SOLICITED;
 203                         }
 204                         qp->s_wqe = wqe;
 205                         if (++qp->s_cur >= qp->s_size)
 206                                 qp->s_cur = 0;
 207                         break;
 208
 209                 default:
 210                         goto bail;
 211                 }
 212                 break;
 213
 214         case OP(SEND_FIRST):
 215                 qp->s_state = OP(SEND_MIDDLE);
 216                 /* FALLTHROUGH */
 217         case OP(SEND_MIDDLE):
 218                 len = qp->s_len;
 219                 if (len > pmtu) {
 220                         len = pmtu;
 221                         middle = HFI1_CAP_IS_KSET(SDMA_AHG);
 222                         break;
 223                 }
 224                 if (wqe->wr.opcode == IB_WR_SEND) {
 225                         qp->s_state = OP(SEND_LAST);
 226                 } else {
 227                         qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE);
 228                         /* Immediate data comes after the BTH */
 229                         ohdr->u.imm_data = wqe->wr.ex.imm_data;
 230                         hwords += 1;
 231                 }
 232                 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 233                         bth0 |= IB_BTH_SOLICITED;
 234                 qp->s_wqe = wqe;
 235                 if (++qp->s_cur >= qp->s_size)
 236                         qp->s_cur = 0;
 237                 break;
 238
 239         case OP(RDMA_WRITE_FIRST):
 240                 qp->s_state = OP(RDMA_WRITE_MIDDLE);
 241                 /* FALLTHROUGH */
 242         case OP(RDMA_WRITE_MIDDLE):
 243                 len = qp->s_len;
 244                 if (len > pmtu) {
 245                         len = pmtu;
 246                         middle = HFI1_CAP_IS_KSET(SDMA_AHG);
 247                         break;
 248                 }
 249                 if (wqe->wr.opcode == IB_WR_RDMA_WRITE) {
 250                         qp->s_state = OP(RDMA_WRITE_LAST);
 251                 } else {
 252                         qp->s_state =
 253                                 OP(RDMA_WRITE_LAST_WITH_IMMEDIATE);
 254                         /* Immediate data comes after the BTH */
 255                         ohdr->u.imm_data = wqe->wr.ex.imm_data;
 256                         hwords += 1;
 257                         if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 258                                 bth0 |= IB_BTH_SOLICITED;
 259                 }
 260                 qp->s_wqe = wqe;
 261                 if (++qp->s_cur >= qp->s_size)
 262                         qp->s_cur = 0;
 263                 break;
 264         }
 265         qp->s_len -= len;
 266         qp->s_hdrwords = hwords;
 267         ps->s_txreq->sde = priv->s_sde;
 268         qp->s_cur_sge = &qp->s_sge;
 269         qp->s_cur_size = len;
 270         hfi1_make_ruc_header(qp, ohdr, bth0 | (qp->s_state << 24),
 271                              mask_psn(qp->s_psn++), middle, ps);
 272         /* pbc */
 273         ps->s_txreq->hdr_dwords = qp->s_hdrwords + 2;
 274         return 1;
 275
 276 done_free_tx:
 277         hfi1_put_txreq(ps->s_txreq);
 278         ps->s_txreq = NULL;
 279         return 1;
 280
 281 bail:
 282         hfi1_put_txreq(ps->s_txreq);
 283
 284 bail_no_tx:
 285         ps->s_txreq = NULL;
 286         qp->s_flags &= ~RVT_S_BUSY;
 287         qp->s_hdrwords = 0;
 288         return 0;
 289 }
 290
 291 /**
 292  * hfi1_uc_rcv - handle an incoming UC packet
 293  * @ibp: the port the packet came in on
 294  * @hdr: the header of the packet
 295  * @rcv_flags: flags relevant to rcv processing
 296  * @data: the packet data
 297  * @tlen: the length of the packet
 298  * @qp: the QP for this packet.
 299  *
 300  * This is called from qp_rcv() to process an incoming UC packet
 301  * for the given QP.
 302  * Called at interrupt level.
 303  */
 304 void hfi1_uc_rcv(struct hfi1_packet *packet)
 305 {
 306         struct hfi1_ibport *ibp = &packet->rcd->ppd->ibport_data;
 307         struct hfi1_ib_header *hdr = packet->hdr;
 308         u32 rcv_flags = packet->rcv_flags;
 309         void *data = packet->ebuf;
 310         u32 tlen = packet->tlen;
 311         struct rvt_qp *qp = packet->qp;
 312         struct hfi1_other_headers *ohdr = packet->ohdr;
 313         u32 bth0, opcode;
 314         u32 hdrsize = packet->hlen;
 315         u32 psn;
 316         u32 pad;
 317         struct ib_wc wc;
 318         u32 pmtu = qp->pmtu;
 319         struct ib_reth *reth;
 320         int has_grh = rcv_flags & HFI1_HAS_GRH;
 321         int ret;
 322
 323         bth0 = be32_to_cpu(ohdr->bth[0]);
 324         if (hfi1_ruc_check_hdr(ibp, hdr, has_grh, qp, bth0))
 325                 return;
 326
 327         process_ecn(qp, packet, true);
 328
 329         psn = be32_to_cpu(ohdr->bth[2]);
 330         opcode = (bth0 >> 24) & 0xff;
 331
 332         /* Compare the PSN verses the expected PSN. */
 333         if (unlikely(cmp_psn(psn, qp->r_psn) != 0)) {
 334                 /*
 335                  * Handle a sequence error.
 336                  * Silently drop any current message.
 337                  */
 338                 qp->r_psn = psn;
 339 inv:
 340                 if (qp->r_state == OP(SEND_FIRST) ||
 341                     qp->r_state == OP(SEND_MIDDLE)) {
 342                         set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
 343                         qp->r_sge.num_sge = 0;
 344                 } else {
 345                         rvt_put_ss(&qp->r_sge);
 346                 }
 347                 qp->r_state = OP(SEND_LAST);
 348                 switch (opcode) {
 349                 case OP(SEND_FIRST):
 350                 case OP(SEND_ONLY):
 351                 case OP(SEND_ONLY_WITH_IMMEDIATE):
 352                         goto send_first;
 353
 354                 case OP(RDMA_WRITE_FIRST):
 355                 case OP(RDMA_WRITE_ONLY):
 356                 case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE):
 357                         goto rdma_first;
 358
 359                 default:
 360                         goto drop;
 361                 }
 362         }
 363
 364         /* Check for opcode sequence errors. */
 365         switch (qp->r_state) {
 366         case OP(SEND_FIRST):
 367         case OP(SEND_MIDDLE):
 368                 if (opcode == OP(SEND_MIDDLE) ||
 369                     opcode == OP(SEND_LAST) ||
 370                     opcode == OP(SEND_LAST_WITH_IMMEDIATE))
 371                         break;
 372                 goto inv;
 373
 374         case OP(RDMA_WRITE_FIRST):
 375         case OP(RDMA_WRITE_MIDDLE):
 376                 if (opcode == OP(RDMA_WRITE_MIDDLE) ||
 377                     opcode == OP(RDMA_WRITE_LAST) ||
 378                     opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
 379                         break;
 380                 goto inv;
 381
 382         default:
 383                 if (opcode == OP(SEND_FIRST) ||
 384                     opcode == OP(SEND_ONLY) ||
 385                     opcode == OP(SEND_ONLY_WITH_IMMEDIATE) ||
 386                     opcode == OP(RDMA_WRITE_FIRST) ||
 387                     opcode == OP(RDMA_WRITE_ONLY) ||
 388                     opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
 389                         break;
 390                 goto inv;
 391         }
 392
 393         if (qp->state == IB_QPS_RTR && !(qp->r_flags & RVT_R_COMM_EST))
 394                 qp_comm_est(qp);
 395
 396         /* OK, process the packet. */
 397         switch (opcode) {
 398         case OP(SEND_FIRST):
 399         case OP(SEND_ONLY):
 400         case OP(SEND_ONLY_WITH_IMMEDIATE):
 401 send_first:
 402                 if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags)) {
 403                         qp->r_sge = qp->s_rdma_read_sge;
 404                 } else {
 405                         ret = hfi1_rvt_get_rwqe(qp, 0);
 406                         if (ret < 0)
 407                                 goto op_err;
 408                         if (!ret)
 409                                 goto drop;
 410                         /*
 411                          * qp->s_rdma_read_sge will be the owner
 412                          * of the mr references.
 413                          */
 414                         qp->s_rdma_read_sge = qp->r_sge;
 415                 }
 416                 qp->r_rcv_len = 0;
 417                 if (opcode == OP(SEND_ONLY))
 418                         goto no_immediate_data;
 419                 else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE))
 420                         goto send_last_imm;
 421                 /* FALLTHROUGH */
 422         case OP(SEND_MIDDLE):
 423                 /* Check for invalid length PMTU or posted rwqe len. */
 424                 if (unlikely(tlen != (hdrsize + pmtu + 4)))
 425                         goto rewind;
 426                 qp->r_rcv_len += pmtu;
 427                 if (unlikely(qp->r_rcv_len > qp->r_len))
 428                         goto rewind;
 429                 hfi1_copy_sge(&qp->r_sge, data, pmtu, 0, 0);
 430                 break;
 431
 432         case OP(SEND_LAST_WITH_IMMEDIATE):
 433 send_last_imm:
 434                 wc.ex.imm_data = ohdr->u.imm_data;
 435                 wc.wc_flags = IB_WC_WITH_IMM;
 436                 goto send_last;
 437         case OP(SEND_LAST):
 438 no_immediate_data:
 439                 wc.ex.imm_data = 0;
 440                 wc.wc_flags = 0;
 441 send_last:
 442                 /* Get the number of bytes the message was padded by. */
 443                 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
 444                 /* Check for invalid length. */
 445                 /* LAST len should be >= 1 */
 446                 if (unlikely(tlen < (hdrsize + pad + 4)))
 447                         goto rewind;
 448                 /* Don't count the CRC. */
 449                 tlen -= (hdrsize + pad + 4);
 450                 wc.byte_len = tlen + qp->r_rcv_len;
 451                 if (unlikely(wc.byte_len > qp->r_len))
 452                         goto rewind;
 453                 wc.opcode = IB_WC_RECV;
 454                 hfi1_copy_sge(&qp->r_sge, data, tlen, 0, 0);
 455                 rvt_put_ss(&qp->s_rdma_read_sge);
 456 last_imm:
 457                 wc.wr_id = qp->r_wr_id;
 458                 wc.status = IB_WC_SUCCESS;
 459                 wc.qp = &qp->ibqp;
 460                 wc.src_qp = qp->remote_qpn;
 461                 wc.slid = qp->remote_ah_attr.dlid;
 462                 /*
 463                  * It seems that IB mandates the presence of an SL in a
 464                  * work completion only for the UD transport (see section
 465                  * 11.4.2 of IBTA Vol. 1).
 466                  *
 467                  * However, the way the SL is chosen below is consistent
 468                  * with the way that IB/qib works and is trying avoid
 469                  * introducing incompatibilities.
 470                  *
 471                  * See also OPA Vol. 1, section 9.7.6, and table 9-17.
 472                  */
 473                 wc.sl = qp->remote_ah_attr.sl;
 474                 /* zero fields that are N/A */
 475                 wc.vendor_err = 0;
 476                 wc.pkey_index = 0;
 477                 wc.dlid_path_bits = 0;
 478                 wc.port_num = 0;
 479                 /* Signal completion event if the solicited bit is set. */
 480                 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc,
 481                              (ohdr->bth[0] &
 482                               cpu_to_be32(IB_BTH_SOLICITED)) != 0);
 483                 break;
 484
 485         case OP(RDMA_WRITE_FIRST):
 486         case OP(RDMA_WRITE_ONLY):
 487         case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */
 488 rdma_first:
 489                 if (unlikely(!(qp->qp_access_flags &
 490                                IB_ACCESS_REMOTE_WRITE))) {
 491                         goto drop;
 492                 }
 493                 reth = &ohdr->u.rc.reth;
 494                 qp->r_len = be32_to_cpu(reth->length);
 495                 qp->r_rcv_len = 0;
 496                 qp->r_sge.sg_list = NULL;
 497                 if (qp->r_len != 0) {
 498                         u32 rkey = be32_to_cpu(reth->rkey);
 499                         u64 vaddr = be64_to_cpu(reth->vaddr);
 500                         int ok;
 501
 502                         /* Check rkey */
 503                         ok = rvt_rkey_ok(qp, &qp->r_sge.sge, qp->r_len,
 504                                          vaddr, rkey, IB_ACCESS_REMOTE_WRITE);
 505                         if (unlikely(!ok))
 506                                 goto drop;
 507                         qp->r_sge.num_sge = 1;
 508                 } else {
 509                         qp->r_sge.num_sge = 0;
 510                         qp->r_sge.sge.mr = NULL;
 511                         qp->r_sge.sge.vaddr = NULL;
 512                         qp->r_sge.sge.length = 0;
 513                         qp->r_sge.sge.sge_length = 0;
 514                 }
 515                 if (opcode == OP(RDMA_WRITE_ONLY)) {
 516                         goto rdma_last;
 517                 } else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) {
 518                         wc.ex.imm_data = ohdr->u.rc.imm_data;
 519                         goto rdma_last_imm;
 520                 }
 521                 /* FALLTHROUGH */
 522         case OP(RDMA_WRITE_MIDDLE):
 523                 /* Check for invalid length PMTU or posted rwqe len. */
 524                 if (unlikely(tlen != (hdrsize + pmtu + 4)))
 525                         goto drop;
 526                 qp->r_rcv_len += pmtu;
 527                 if (unlikely(qp->r_rcv_len > qp->r_len))
 528                         goto drop;
 529                 hfi1_copy_sge(&qp->r_sge, data, pmtu, 1, 0);
 530                 break;
 531
 532         case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
 533                 wc.ex.imm_data = ohdr->u.imm_data;
 534 rdma_last_imm:
 535                 wc.wc_flags = IB_WC_WITH_IMM;
 536
 537                 /* Get the number of bytes the message was padded by. */
 538                 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
 539                 /* Check for invalid length. */
 540                 /* LAST len should be >= 1 */
 541                 if (unlikely(tlen < (hdrsize + pad + 4)))
 542                         goto drop;
 543                 /* Don't count the CRC. */
 544                 tlen -= (hdrsize + pad + 4);
 545                 if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
 546                         goto drop;
 547                 if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags)) {
 548                         rvt_put_ss(&qp->s_rdma_read_sge);
 549                 } else {
 550                         ret = hfi1_rvt_get_rwqe(qp, 1);
 551                         if (ret < 0)
 552                                 goto op_err;
 553                         if (!ret)
 554                                 goto drop;
 555                 }
 556                 wc.byte_len = qp->r_len;
 557                 wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
 558                 hfi1_copy_sge(&qp->r_sge, data, tlen, 1, 0);
 559                 rvt_put_ss(&qp->r_sge);
 560                 goto last_imm;
 561
 562         case OP(RDMA_WRITE_LAST):
 563 rdma_last:
 564                 /* Get the number of bytes the message was padded by. */
 565                 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
 566                 /* Check for invalid length. */
 567                 /* LAST len should be >= 1 */
 568                 if (unlikely(tlen < (hdrsize + pad + 4)))
 569                         goto drop;
 570                 /* Don't count the CRC. */
 571                 tlen -= (hdrsize + pad + 4);
 572                 if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
 573                         goto drop;
 574                 hfi1_copy_sge(&qp->r_sge, data, tlen, 1, 0);
 575                 rvt_put_ss(&qp->r_sge);
 576                 break;
 577
 578         default:
 579                 /* Drop packet for unknown opcodes. */
 580                 goto drop;
 581         }
 582         qp->r_psn++;
 583         qp->r_state = opcode;
 584         return;
 585
 586 rewind:
 587         set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
 588         qp->r_sge.num_sge = 0;
 589 drop:
 590         ibp->rvp.n_pkt_drops++;
 591         return;
 592
 593 op_err:
 594         hfi1_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
 595 }