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                  * Start a new request.
 123                  */
 124                 qp->s_psn = wqe->psn;
 125                 qp->s_sge.sge = wqe->sg_list[0];
 126                 qp->s_sge.sg_list = wqe->sg_list + 1;
 127                 qp->s_sge.num_sge = wqe->wr.num_sge;
 128                 qp->s_sge.total_len = wqe->length;
 129                 len = wqe->length;
 130                 qp->s_len = len;
 131                 switch (wqe->wr.opcode) {
 132                 case IB_WR_SEND:
 133                 case IB_WR_SEND_WITH_IMM:
 134                         if (len > pmtu) {
 135                                 qp->s_state = OP(SEND_FIRST);
 136                                 len = pmtu;
 137                                 break;
 138                         }
 139                         if (wqe->wr.opcode == IB_WR_SEND) {
 140                                 qp->s_state = OP(SEND_ONLY);
 141                         } else {
 142                                 qp->s_state =
 143                                         OP(SEND_ONLY_WITH_IMMEDIATE);
 144                                 /* Immediate data comes after the BTH */
 145                                 ohdr->u.imm_data = wqe->wr.ex.imm_data;
 146                                 hwords += 1;
 147                         }
 148                         if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 149                                 bth0 |= IB_BTH_SOLICITED;
 150                         qp->s_wqe = wqe;
 151                         if (++qp->s_cur >= qp->s_size)
 152                                 qp->s_cur = 0;
 153                         break;
 154
 155                 case IB_WR_RDMA_WRITE:
 156                 case IB_WR_RDMA_WRITE_WITH_IMM:
 157                         ohdr->u.rc.reth.vaddr =
 158                                 cpu_to_be64(wqe->rdma_wr.remote_addr);
 159                         ohdr->u.rc.reth.rkey =
 160                                 cpu_to_be32(wqe->rdma_wr.rkey);
 161                         ohdr->u.rc.reth.length = cpu_to_be32(len);
 162                         hwords += sizeof(struct ib_reth) / 4;
 163                         if (len > pmtu) {
 164                                 qp->s_state = OP(RDMA_WRITE_FIRST);
 165                                 len = pmtu;
 166                                 break;
 167                         }
 168                         if (wqe->wr.opcode == IB_WR_RDMA_WRITE) {
 169                                 qp->s_state = OP(RDMA_WRITE_ONLY);
 170                         } else {
 171                                 qp->s_state =
 172                                         OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE);
 173                                 /* Immediate data comes after the RETH */
 174                                 ohdr->u.rc.imm_data = wqe->wr.ex.imm_data;
 175                                 hwords += 1;
 176                                 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 177                                         bth0 |= IB_BTH_SOLICITED;
 178                         }
 179                         qp->s_wqe = wqe;
 180                         if (++qp->s_cur >= qp->s_size)
 181                                 qp->s_cur = 0;
 182                         break;
 183
 184                 default:
 185                         goto bail;
 186                 }
 187                 break;
 188
 189         case OP(SEND_FIRST):
 190                 qp->s_state = OP(SEND_MIDDLE);
 191                 /* FALLTHROUGH */
 192         case OP(SEND_MIDDLE):
 193                 len = qp->s_len;
 194                 if (len > pmtu) {
 195                         len = pmtu;
 196                         middle = HFI1_CAP_IS_KSET(SDMA_AHG);
 197                         break;
 198                 }
 199                 if (wqe->wr.opcode == IB_WR_SEND) {
 200                         qp->s_state = OP(SEND_LAST);
 201                 } else {
 202                         qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE);
 203                         /* Immediate data comes after the BTH */
 204                         ohdr->u.imm_data = wqe->wr.ex.imm_data;
 205                         hwords += 1;
 206                 }
 207                 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 208                         bth0 |= IB_BTH_SOLICITED;
 209                 qp->s_wqe = wqe;
 210                 if (++qp->s_cur >= qp->s_size)
 211                         qp->s_cur = 0;
 212                 break;
 213
 214         case OP(RDMA_WRITE_FIRST):
 215                 qp->s_state = OP(RDMA_WRITE_MIDDLE);
 216                 /* FALLTHROUGH */
 217         case OP(RDMA_WRITE_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_RDMA_WRITE) {
 225                         qp->s_state = OP(RDMA_WRITE_LAST);
 226                 } else {
 227                         qp->s_state =
 228                                 OP(RDMA_WRITE_LAST_WITH_IMMEDIATE);
 229                         /* Immediate data comes after the BTH */
 230                         ohdr->u.imm_data = wqe->wr.ex.imm_data;
 231                         hwords += 1;
 232                         if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 233                                 bth0 |= IB_BTH_SOLICITED;
 234                 }
 235                 qp->s_wqe = wqe;
 236                 if (++qp->s_cur >= qp->s_size)
 237                         qp->s_cur = 0;
 238                 break;
 239         }
 240         qp->s_len -= len;
 241         qp->s_hdrwords = hwords;
 242         ps->s_txreq->sde = priv->s_sde;
 243         qp->s_cur_sge = &qp->s_sge;
 244         qp->s_cur_size = len;
 245         hfi1_make_ruc_header(qp, ohdr, bth0 | (qp->s_state << 24),
 246                              mask_psn(qp->s_psn++), middle, ps);
 247         /* pbc */
 248         ps->s_txreq->hdr_dwords = qp->s_hdrwords + 2;
 249         return 1;
 250
 251 done_free_tx:
 252         hfi1_put_txreq(ps->s_txreq);
 253         ps->s_txreq = NULL;
 254         return 1;
 255
 256 bail:
 257         hfi1_put_txreq(ps->s_txreq);
 258
 259 bail_no_tx:
 260         ps->s_txreq = NULL;
 261         qp->s_flags &= ~RVT_S_BUSY;
 262         qp->s_hdrwords = 0;
 263         return 0;
 264 }
 265
 266 /**
 267  * hfi1_uc_rcv - handle an incoming UC packet
 268  * @ibp: the port the packet came in on
 269  * @hdr: the header of the packet
 270  * @rcv_flags: flags relevant to rcv processing
 271  * @data: the packet data
 272  * @tlen: the length of the packet
 273  * @qp: the QP for this packet.
 274  *
 275  * This is called from qp_rcv() to process an incoming UC packet
 276  * for the given QP.
 277  * Called at interrupt level.
 278  */
 279 void hfi1_uc_rcv(struct hfi1_packet *packet)
 280 {
 281         struct hfi1_ibport *ibp = &packet->rcd->ppd->ibport_data;
 282         struct hfi1_ib_header *hdr = packet->hdr;
 283         u32 rcv_flags = packet->rcv_flags;
 284         void *data = packet->ebuf;
 285         u32 tlen = packet->tlen;
 286         struct rvt_qp *qp = packet->qp;
 287         struct hfi1_other_headers *ohdr = packet->ohdr;
 288         u32 bth0, opcode;
 289         u32 hdrsize = packet->hlen;
 290         u32 psn;
 291         u32 pad;
 292         struct ib_wc wc;
 293         u32 pmtu = qp->pmtu;
 294         struct ib_reth *reth;
 295         int has_grh = rcv_flags & HFI1_HAS_GRH;
 296         int ret;
 297         u32 bth1;
 298
 299         bth0 = be32_to_cpu(ohdr->bth[0]);
 300         if (hfi1_ruc_check_hdr(ibp, hdr, has_grh, qp, bth0))
 301                 return;
 302
 303         bth1 = be32_to_cpu(ohdr->bth[1]);
 304         if (unlikely(bth1 & (HFI1_BECN_SMASK | HFI1_FECN_SMASK))) {
 305                 if (bth1 & HFI1_BECN_SMASK) {
 306                         struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 307                         u32 rqpn, lqpn;
 308                         u16 rlid = be16_to_cpu(hdr->lrh[3]);
 309                         u8 sl, sc5;
 310
 311                         lqpn = bth1 & RVT_QPN_MASK;
 312                         rqpn = qp->remote_qpn;
 313
 314                         sc5 = ibp->sl_to_sc[qp->remote_ah_attr.sl];
 315                         sl = ibp->sc_to_sl[sc5];
 316
 317                         process_becn(ppd, sl, rlid, lqpn, rqpn,
 318                                      IB_CC_SVCTYPE_UC);
 319                 }
 320
 321                 if (bth1 & HFI1_FECN_SMASK) {
 322                         struct ib_grh *grh = NULL;
 323                         u16 pkey = (u16)be32_to_cpu(ohdr->bth[0]);
 324                         u16 slid = be16_to_cpu(hdr->lrh[3]);
 325                         u16 dlid = be16_to_cpu(hdr->lrh[1]);
 326                         u32 src_qp = qp->remote_qpn;
 327                         u8 sc5;
 328
 329                         sc5 = ibp->sl_to_sc[qp->remote_ah_attr.sl];
 330                         if (has_grh)
 331                                 grh = &hdr->u.l.grh;
 332
 333                         return_cnp(ibp, qp, src_qp, pkey, dlid, slid, sc5,
 334                                    grh);
 335                 }
 336         }
 337
 338         psn = be32_to_cpu(ohdr->bth[2]);
 339         opcode = (bth0 >> 24) & 0xff;
 340
 341         /* Compare the PSN verses the expected PSN. */
 342         if (unlikely(cmp_psn(psn, qp->r_psn) != 0)) {
 343                 /*
 344                  * Handle a sequence error.
 345                  * Silently drop any current message.
 346                  */
 347                 qp->r_psn = psn;
 348 inv:
 349                 if (qp->r_state == OP(SEND_FIRST) ||
 350                     qp->r_state == OP(SEND_MIDDLE)) {
 351                         set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
 352                         qp->r_sge.num_sge = 0;
 353                 } else {
 354                         rvt_put_ss(&qp->r_sge);
 355                 }
 356                 qp->r_state = OP(SEND_LAST);
 357                 switch (opcode) {
 358                 case OP(SEND_FIRST):
 359                 case OP(SEND_ONLY):
 360                 case OP(SEND_ONLY_WITH_IMMEDIATE):
 361                         goto send_first;
 362
 363                 case OP(RDMA_WRITE_FIRST):
 364                 case OP(RDMA_WRITE_ONLY):
 365                 case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE):
 366                         goto rdma_first;
 367
 368                 default:
 369                         goto drop;
 370                 }
 371         }
 372
 373         /* Check for opcode sequence errors. */
 374         switch (qp->r_state) {
 375         case OP(SEND_FIRST):
 376         case OP(SEND_MIDDLE):
 377                 if (opcode == OP(SEND_MIDDLE) ||
 378                     opcode == OP(SEND_LAST) ||
 379                     opcode == OP(SEND_LAST_WITH_IMMEDIATE))
 380                         break;
 381                 goto inv;
 382
 383         case OP(RDMA_WRITE_FIRST):
 384         case OP(RDMA_WRITE_MIDDLE):
 385                 if (opcode == OP(RDMA_WRITE_MIDDLE) ||
 386                     opcode == OP(RDMA_WRITE_LAST) ||
 387                     opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
 388                         break;
 389                 goto inv;
 390
 391         default:
 392                 if (opcode == OP(SEND_FIRST) ||
 393                     opcode == OP(SEND_ONLY) ||
 394                     opcode == OP(SEND_ONLY_WITH_IMMEDIATE) ||
 395                     opcode == OP(RDMA_WRITE_FIRST) ||
 396                     opcode == OP(RDMA_WRITE_ONLY) ||
 397                     opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
 398                         break;
 399                 goto inv;
 400         }
 401
 402         if (qp->state == IB_QPS_RTR && !(qp->r_flags & RVT_R_COMM_EST))
 403                 qp_comm_est(qp);
 404
 405         /* OK, process the packet. */
 406         switch (opcode) {
 407         case OP(SEND_FIRST):
 408         case OP(SEND_ONLY):
 409         case OP(SEND_ONLY_WITH_IMMEDIATE):
 410 send_first:
 411                 if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags)) {
 412                         qp->r_sge = qp->s_rdma_read_sge;
 413                 } else {
 414                         ret = hfi1_rvt_get_rwqe(qp, 0);
 415                         if (ret < 0)
 416                                 goto op_err;
 417                         if (!ret)
 418                                 goto drop;
 419                         /*
 420                          * qp->s_rdma_read_sge will be the owner
 421                          * of the mr references.
 422                          */
 423                         qp->s_rdma_read_sge = qp->r_sge;
 424                 }
 425                 qp->r_rcv_len = 0;
 426                 if (opcode == OP(SEND_ONLY))
 427                         goto no_immediate_data;
 428                 else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE))
 429                         goto send_last_imm;
 430                 /* FALLTHROUGH */
 431         case OP(SEND_MIDDLE):
 432                 /* Check for invalid length PMTU or posted rwqe len. */
 433                 if (unlikely(tlen != (hdrsize + pmtu + 4)))
 434                         goto rewind;
 435                 qp->r_rcv_len += pmtu;
 436                 if (unlikely(qp->r_rcv_len > qp->r_len))
 437                         goto rewind;
 438                 hfi1_copy_sge(&qp->r_sge, data, pmtu, 0, 0);
 439                 break;
 440
 441         case OP(SEND_LAST_WITH_IMMEDIATE):
 442 send_last_imm:
 443                 wc.ex.imm_data = ohdr->u.imm_data;
 444                 wc.wc_flags = IB_WC_WITH_IMM;
 445                 goto send_last;
 446         case OP(SEND_LAST):
 447 no_immediate_data:
 448                 wc.ex.imm_data = 0;
 449                 wc.wc_flags = 0;
 450 send_last:
 451                 /* Get the number of bytes the message was padded by. */
 452                 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
 453                 /* Check for invalid length. */
 454                 /* LAST len should be >= 1 */
 455                 if (unlikely(tlen < (hdrsize + pad + 4)))
 456                         goto rewind;
 457                 /* Don't count the CRC. */
 458                 tlen -= (hdrsize + pad + 4);
 459                 wc.byte_len = tlen + qp->r_rcv_len;
 460                 if (unlikely(wc.byte_len > qp->r_len))
 461                         goto rewind;
 462                 wc.opcode = IB_WC_RECV;
 463                 hfi1_copy_sge(&qp->r_sge, data, tlen, 0, 0);
 464                 rvt_put_ss(&qp->s_rdma_read_sge);
 465 last_imm:
 466                 wc.wr_id = qp->r_wr_id;
 467                 wc.status = IB_WC_SUCCESS;
 468                 wc.qp = &qp->ibqp;
 469                 wc.src_qp = qp->remote_qpn;
 470                 wc.slid = qp->remote_ah_attr.dlid;
 471                 /*
 472                  * It seems that IB mandates the presence of an SL in a
 473                  * work completion only for the UD transport (see section
 474                  * 11.4.2 of IBTA Vol. 1).
 475                  *
 476                  * However, the way the SL is chosen below is consistent
 477                  * with the way that IB/qib works and is trying avoid
 478                  * introducing incompatibilities.
 479                  *
 480                  * See also OPA Vol. 1, section 9.7.6, and table 9-17.
 481                  */
 482                 wc.sl = qp->remote_ah_attr.sl;
 483                 /* zero fields that are N/A */
 484                 wc.vendor_err = 0;
 485                 wc.pkey_index = 0;
 486                 wc.dlid_path_bits = 0;
 487                 wc.port_num = 0;
 488                 /* Signal completion event if the solicited bit is set. */
 489                 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc,
 490                              (ohdr->bth[0] &
 491                               cpu_to_be32(IB_BTH_SOLICITED)) != 0);
 492                 break;
 493
 494         case OP(RDMA_WRITE_FIRST):
 495         case OP(RDMA_WRITE_ONLY):
 496         case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */
 497 rdma_first:
 498                 if (unlikely(!(qp->qp_access_flags &
 499                                IB_ACCESS_REMOTE_WRITE))) {
 500                         goto drop;
 501                 }
 502                 reth = &ohdr->u.rc.reth;
 503                 qp->r_len = be32_to_cpu(reth->length);
 504                 qp->r_rcv_len = 0;
 505                 qp->r_sge.sg_list = NULL;
 506                 if (qp->r_len != 0) {
 507                         u32 rkey = be32_to_cpu(reth->rkey);
 508                         u64 vaddr = be64_to_cpu(reth->vaddr);
 509                         int ok;
 510
 511                         /* Check rkey */
 512                         ok = rvt_rkey_ok(qp, &qp->r_sge.sge, qp->r_len,
 513                                          vaddr, rkey, IB_ACCESS_REMOTE_WRITE);
 514                         if (unlikely(!ok))
 515                                 goto drop;
 516                         qp->r_sge.num_sge = 1;
 517                 } else {
 518                         qp->r_sge.num_sge = 0;
 519                         qp->r_sge.sge.mr = NULL;
 520                         qp->r_sge.sge.vaddr = NULL;
 521                         qp->r_sge.sge.length = 0;
 522                         qp->r_sge.sge.sge_length = 0;
 523                 }
 524                 if (opcode == OP(RDMA_WRITE_ONLY)) {
 525                         goto rdma_last;
 526                 } else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) {
 527                         wc.ex.imm_data = ohdr->u.rc.imm_data;
 528                         goto rdma_last_imm;
 529                 }
 530                 /* FALLTHROUGH */
 531         case OP(RDMA_WRITE_MIDDLE):
 532                 /* Check for invalid length PMTU or posted rwqe len. */
 533                 if (unlikely(tlen != (hdrsize + pmtu + 4)))
 534                         goto drop;
 535                 qp->r_rcv_len += pmtu;
 536                 if (unlikely(qp->r_rcv_len > qp->r_len))
 537                         goto drop;
 538                 hfi1_copy_sge(&qp->r_sge, data, pmtu, 1, 0);
 539                 break;
 540
 541         case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
 542                 wc.ex.imm_data = ohdr->u.imm_data;
 543 rdma_last_imm:
 544                 wc.wc_flags = IB_WC_WITH_IMM;
 545
 546                 /* Get the number of bytes the message was padded by. */
 547                 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
 548                 /* Check for invalid length. */
 549                 /* LAST len should be >= 1 */
 550                 if (unlikely(tlen < (hdrsize + pad + 4)))
 551                         goto drop;
 552                 /* Don't count the CRC. */
 553                 tlen -= (hdrsize + pad + 4);
 554                 if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
 555                         goto drop;
 556                 if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags)) {
 557                         rvt_put_ss(&qp->s_rdma_read_sge);
 558                 } else {
 559                         ret = hfi1_rvt_get_rwqe(qp, 1);
 560                         if (ret < 0)
 561                                 goto op_err;
 562                         if (!ret)
 563                                 goto drop;
 564                 }
 565                 wc.byte_len = qp->r_len;
 566                 wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
 567                 hfi1_copy_sge(&qp->r_sge, data, tlen, 1, 0);
 568                 rvt_put_ss(&qp->r_sge);
 569                 goto last_imm;
 570
 571         case OP(RDMA_WRITE_LAST):
 572 rdma_last:
 573                 /* Get the number of bytes the message was padded by. */
 574                 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
 575                 /* Check for invalid length. */
 576                 /* LAST len should be >= 1 */
 577                 if (unlikely(tlen < (hdrsize + pad + 4)))
 578                         goto drop;
 579                 /* Don't count the CRC. */
 580                 tlen -= (hdrsize + pad + 4);
 581                 if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
 582                         goto drop;
 583                 hfi1_copy_sge(&qp->r_sge, data, tlen, 1, 0);
 584                 rvt_put_ss(&qp->r_sge);
 585                 break;
 586
 587         default:
 588                 /* Drop packet for unknown opcodes. */
 589                 goto drop;
 590         }
 591         qp->r_psn++;
 592         qp->r_state = opcode;
 593         return;
 594
 595 rewind:
 596         set_bit(RVT_R_REWIND_SGE, &qp->r_aflags);
 597         qp->r_sge.num_sge = 0;
 598 drop:
 599         ibp->rvp.n_pkt_drops++;
 600         return;
 601
 602 op_err:
 603         hfi1_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
 604 }