release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/infiniband/hw/ipath/ipath_ud.c

   1 /*
   2  * Copyright (c) 2006, 2007, 2008 QLogic Corporation. All rights reserved.
   3  * Copyright (c) 2005, 2006 PathScale, 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/sched.h>
  35 #include <rdma/ib_smi.h>
  36
  37 #include "ipath_verbs.h"
  38 #include "ipath_kernel.h"
  39
  40 /**
  41  * ipath_ud_loopback - handle send on loopback QPs
  42  * @sqp: the sending QP
  43  * @swqe: the send work request
  44  *
  45  * This is called from ipath_make_ud_req() to forward a WQE addressed
  46  * to the same HCA.
  47  * Note that the receive interrupt handler may be calling ipath_ud_rcv()
  48  * while this is being called.
  49  */
  50 static void ipath_ud_loopback(struct ipath_qp *sqp, struct ipath_swqe *swqe)
  51 {
  52         struct ipath_ibdev *dev = to_idev(sqp->ibqp.device);
  53         struct ipath_qp *qp;
  54         struct ib_ah_attr *ah_attr;
  55         unsigned long flags;
  56         struct ipath_rq *rq;
  57         struct ipath_srq *srq;
  58         struct ipath_sge_state rsge;
  59         struct ipath_sge *sge;
  60         struct ipath_rwq *wq;
  61         struct ipath_rwqe *wqe;
  62         void (*handler)(struct ib_event *, void *);
  63         struct ib_wc wc;
  64         u32 tail;
  65         u32 rlen;
  66         u32 length;
  67
  68         qp = ipath_lookup_qpn(&dev->qp_table, swqe->wr.wr.ud.remote_qpn);
  69         if (!qp || !(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_RECV_OK)) {
  70                 dev->n_pkt_drops++;
  71                 goto done;
  72         }
  73
  74         /*
  75          * Check that the qkey matches (except for QP0, see 9.6.1.4.1).
  76          * Qkeys with the high order bit set mean use the
  77          * qkey from the QP context instead of the WR (see 10.2.5).
  78          */
  79         if (unlikely(qp->ibqp.qp_num &&
  80                      ((int) swqe->wr.wr.ud.remote_qkey < 0 ?
  81                       sqp->qkey : swqe->wr.wr.ud.remote_qkey) != qp->qkey)) {
  82                 dev->qkey_violations++;
  83                 dev->n_pkt_drops++;
  84                 goto drop;
  85         }
  86
  87         /*
  88          * A GRH is expected to preceed the data even if not
  89          * present on the wire.
  90          */
  91         length = swqe->length;
  92         memset(&wc, 0, sizeof wc);
  93         wc.byte_len = length + sizeof(struct ib_grh);
  94
  95         if (swqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
  96                 wc.wc_flags = IB_WC_WITH_IMM;
  97                 wc.ex.imm_data = swqe->wr.ex.imm_data;
  98         }
  99
 100         /*
 101          * This would be a lot simpler if we could call ipath_get_rwqe()
 102          * but that uses state that the receive interrupt handler uses
 103          * so we would need to lock out receive interrupts while doing
 104          * local loopback.
 105          */
 106         if (qp->ibqp.srq) {
 107                 srq = to_isrq(qp->ibqp.srq);
 108                 handler = srq->ibsrq.event_handler;
 109                 rq = &srq->rq;
 110         } else {
 111                 srq = NULL;
 112                 handler = NULL;
 113                 rq = &qp->r_rq;
 114         }
 115
 116         /*
 117          * Get the next work request entry to find where to put the data.
 118          * Note that it is safe to drop the lock after changing rq->tail
 119          * since ipath_post_receive() won't fill the empty slot.
 120          */
 121         spin_lock_irqsave(&rq->lock, flags);
 122         wq = rq->wq;
 123         tail = wq->tail;
 124         /* Validate tail before using it since it is user writable. */
 125         if (tail >= rq->size)
 126                 tail = 0;
 127         if (unlikely(tail == wq->head)) {
 128                 spin_unlock_irqrestore(&rq->lock, flags);
 129                 dev->n_pkt_drops++;
 130                 goto drop;
 131         }
 132         wqe = get_rwqe_ptr(rq, tail);
 133         rsge.sg_list = qp->r_ud_sg_list;
 134         if (!ipath_init_sge(qp, wqe, &rlen, &rsge)) {
 135                 spin_unlock_irqrestore(&rq->lock, flags);
 136                 dev->n_pkt_drops++;
 137                 goto drop;
 138         }
 139         /* Silently drop packets which are too big. */
 140         if (wc.byte_len > rlen) {
 141                 spin_unlock_irqrestore(&rq->lock, flags);
 142                 dev->n_pkt_drops++;
 143                 goto drop;
 144         }
 145         if (++tail >= rq->size)
 146                 tail = 0;
 147         wq->tail = tail;
 148         wc.wr_id = wqe->wr_id;
 149         if (handler) {
 150                 u32 n;
 151
 152                 /*
 153                  * validate head pointer value and compute
 154                  * the number of remaining WQEs.
 155                  */
 156                 n = wq->head;
 157                 if (n >= rq->size)
 158                         n = 0;
 159                 if (n < tail)
 160                         n += rq->size - tail;
 161                 else
 162                         n -= tail;
 163                 if (n < srq->limit) {
 164                         struct ib_event ev;
 165
 166                         srq->limit = 0;
 167                         spin_unlock_irqrestore(&rq->lock, flags);
 168                         ev.device = qp->ibqp.device;
 169                         ev.element.srq = qp->ibqp.srq;
 170                         ev.event = IB_EVENT_SRQ_LIMIT_REACHED;
 171                         handler(&ev, srq->ibsrq.srq_context);
 172                 } else
 173                         spin_unlock_irqrestore(&rq->lock, flags);
 174         } else
 175                 spin_unlock_irqrestore(&rq->lock, flags);
 176
 177         ah_attr = &to_iah(swqe->wr.wr.ud.ah)->attr;
 178         if (ah_attr->ah_flags & IB_AH_GRH) {
 179                 ipath_copy_sge(&rsge, &ah_attr->grh, sizeof(struct ib_grh));
 180                 wc.wc_flags |= IB_WC_GRH;
 181         } else
 182                 ipath_skip_sge(&rsge, sizeof(struct ib_grh));
 183         sge = swqe->sg_list;
 184         while (length) {
 185                 u32 len = sge->length;
 186
 187                 if (len > length)
 188                         len = length;
 189                 if (len > sge->sge_length)
 190                         len = sge->sge_length;
 191                 BUG_ON(len == 0);
 192                 ipath_copy_sge(&rsge, sge->vaddr, len);
 193                 sge->vaddr += len;
 194                 sge->length -= len;
 195                 sge->sge_length -= len;
 196                 if (sge->sge_length == 0) {
 197                         if (--swqe->wr.num_sge)
 198                                 sge++;
 199                 } else if (sge->length == 0 && sge->mr != NULL) {
 200                         if (++sge->n >= IPATH_SEGSZ) {
 201                                 if (++sge->m >= sge->mr->mapsz)
 202                                         break;
 203                                 sge->n = 0;
 204                         }
 205                         sge->vaddr =
 206                                 sge->mr->map[sge->m]->segs[sge->n].vaddr;
 207                         sge->length =
 208                                 sge->mr->map[sge->m]->segs[sge->n].length;
 209                 }
 210                 length -= len;
 211         }
 212         wc.status = IB_WC_SUCCESS;
 213         wc.opcode = IB_WC_RECV;
 214         wc.qp = &qp->ibqp;
 215         wc.src_qp = sqp->ibqp.qp_num;
 216         wc.pkey_index = 0;
 217         wc.slid = dev->dd->ipath_lid |
 218                 (ah_attr->src_path_bits &
 219                  ((1 << dev->dd->ipath_lmc) - 1));
 220         wc.sl = ah_attr->sl;
 221         wc.dlid_path_bits =
 222                 ah_attr->dlid & ((1 << dev->dd->ipath_lmc) - 1);
 223         wc.port_num = 1;
 224         /* Signal completion event if the solicited bit is set. */
 225         ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
 226                        swqe->wr.send_flags & IB_SEND_SOLICITED);
 227 drop:
 228         if (atomic_dec_and_test(&qp->refcount))
 229                 wake_up(&qp->wait);
 230 done:;
 231 }
 232
 233 /**
 234  * ipath_make_ud_req - construct a UD request packet
 235  * @qp: the QP
 236  *
 237  * Return 1 if constructed; otherwise, return 0.
 238  */
 239 int ipath_make_ud_req(struct ipath_qp *qp)
 240 {
 241         struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
 242         struct ipath_other_headers *ohdr;
 243         struct ib_ah_attr *ah_attr;
 244         struct ipath_swqe *wqe;
 245         unsigned long flags;
 246         u32 nwords;
 247         u32 extra_bytes;
 248         u32 bth0;
 249         u16 lrh0;
 250         u16 lid;
 251         int ret = 0;
 252         int next_cur;
 253
 254         spin_lock_irqsave(&qp->s_lock, flags);
 255
 256         if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_NEXT_SEND_OK)) {
 257                 if (!(ib_ipath_state_ops[qp->state] & IPATH_FLUSH_SEND))
 258                         goto bail;
 259                 /* We are in the error state, flush the work request. */
 260                 if (qp->s_last == qp->s_head)
 261                         goto bail;
 262                 /* If DMAs are in progress, we can't flush immediately. */
 263                 if (atomic_read(&qp->s_dma_busy)) {
 264                         qp->s_flags |= IPATH_S_WAIT_DMA;
 265                         goto bail;
 266                 }
 267                 wqe = get_swqe_ptr(qp, qp->s_last);
 268                 ipath_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
 269                 goto done;
 270         }
 271
 272         if (qp->s_cur == qp->s_head)
 273                 goto bail;
 274
 275         wqe = get_swqe_ptr(qp, qp->s_cur);
 276         next_cur = qp->s_cur + 1;
 277         if (next_cur >= qp->s_size)
 278                 next_cur = 0;
 279
 280         /* Construct the header. */
 281         ah_attr = &to_iah(wqe->wr.wr.ud.ah)->attr;
 282         if (ah_attr->dlid >= IPATH_MULTICAST_LID_BASE) {
 283                 if (ah_attr->dlid != IPATH_PERMISSIVE_LID)
 284                         dev->n_multicast_xmit++;
 285                 else
 286                         dev->n_unicast_xmit++;
 287         } else {
 288                 dev->n_unicast_xmit++;
 289                 lid = ah_attr->dlid & ~((1 << dev->dd->ipath_lmc) - 1);
 290                 if (unlikely(lid == dev->dd->ipath_lid)) {
 291                         if (atomic_read(&qp->s_dma_busy)) {
 292                                 qp->s_flags |= IPATH_S_WAIT_DMA;
 293                                 goto bail;
 294                         }
 295                         qp->s_cur = next_cur;
 296                         spin_unlock_irqrestore(&qp->s_lock, flags);
 297                         ipath_ud_loopback(qp, wqe);
 298                         spin_lock_irqsave(&qp->s_lock, flags);
 299                         ipath_send_complete(qp, wqe, IB_WC_SUCCESS);
 300                         goto done;
 301                 }
 302         }
 303
 304         qp->s_cur = next_cur;
 305         extra_bytes = -wqe->length & 3;
 306         nwords = (wqe->length + extra_bytes) >> 2;
 307
 308         /* header size in 32-bit words LRH+BTH+DETH = (8+12+8)/4. */
 309         qp->s_hdrwords = 7;
 310         qp->s_cur_size = wqe->length;
 311         qp->s_cur_sge = &qp->s_sge;
 312         qp->s_dmult = ah_attr->static_rate;
 313         qp->s_wqe = wqe;
 314         qp->s_sge.sge = wqe->sg_list[0];
 315         qp->s_sge.sg_list = wqe->sg_list + 1;
 316         qp->s_sge.num_sge = wqe->wr.num_sge;
 317
 318         if (ah_attr->ah_flags & IB_AH_GRH) {
 319                 /* Header size in 32-bit words. */
 320                 qp->s_hdrwords += ipath_make_grh(dev, &qp->s_hdr.u.l.grh,
 321                                                  &ah_attr->grh,
 322                                                  qp->s_hdrwords, nwords);
 323                 lrh0 = IPATH_LRH_GRH;
 324                 ohdr = &qp->s_hdr.u.l.oth;
 325                 /*
 326                  * Don't worry about sending to locally attached multicast
 327                  * QPs.  It is unspecified by the spec. what happens.
 328                  */
 329         } else {
 330                 /* Header size in 32-bit words. */
 331                 lrh0 = IPATH_LRH_BTH;
 332                 ohdr = &qp->s_hdr.u.oth;
 333         }
 334         if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
 335                 qp->s_hdrwords++;
 336                 ohdr->u.ud.imm_data = wqe->wr.ex.imm_data;
 337                 bth0 = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE << 24;
 338         } else
 339                 bth0 = IB_OPCODE_UD_SEND_ONLY << 24;
 340         lrh0 |= ah_attr->sl << 4;
 341         if (qp->ibqp.qp_type == IB_QPT_SMI)
 342                 lrh0 |= 0xF000; /* Set VL (see ch. 13.5.3.1) */
 343         qp->s_hdr.lrh[0] = cpu_to_be16(lrh0);
 344         qp->s_hdr.lrh[1] = cpu_to_be16(ah_attr->dlid);  /* DEST LID */
 345         qp->s_hdr.lrh[2] = cpu_to_be16(qp->s_hdrwords + nwords +
 346                                            SIZE_OF_CRC);
 347         lid = dev->dd->ipath_lid;
 348         if (lid) {
 349                 lid |= ah_attr->src_path_bits &
 350                         ((1 << dev->dd->ipath_lmc) - 1);
 351                 qp->s_hdr.lrh[3] = cpu_to_be16(lid);
 352         } else
 353                 qp->s_hdr.lrh[3] = IB_LID_PERMISSIVE;
 354         if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 355                 bth0 |= 1 << 23;
 356         bth0 |= extra_bytes << 20;
 357         bth0 |= qp->ibqp.qp_type == IB_QPT_SMI ? IPATH_DEFAULT_P_KEY :
 358                 ipath_get_pkey(dev->dd, qp->s_pkey_index);
 359         ohdr->bth[0] = cpu_to_be32(bth0);
 360         /*
 361          * Use the multicast QP if the destination LID is a multicast LID.
 362          */
 363         ohdr->bth[1] = ah_attr->dlid >= IPATH_MULTICAST_LID_BASE &&
 364                 ah_attr->dlid != IPATH_PERMISSIVE_LID ?
 365                 cpu_to_be32(IPATH_MULTICAST_QPN) :
 366                 cpu_to_be32(wqe->wr.wr.ud.remote_qpn);
 367         ohdr->bth[2] = cpu_to_be32(qp->s_next_psn++ & IPATH_PSN_MASK);
 368         /*
 369          * Qkeys with the high order bit set mean use the
 370          * qkey from the QP context instead of the WR (see 10.2.5).
 371          */
 372         ohdr->u.ud.deth[0] = cpu_to_be32((int)wqe->wr.wr.ud.remote_qkey < 0 ?
 373                                          qp->qkey : wqe->wr.wr.ud.remote_qkey);
 374         ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num);
 375
 376 done:
 377         ret = 1;
 378         goto unlock;
 379
 380 bail:
 381         qp->s_flags &= ~IPATH_S_BUSY;
 382 unlock:
 383         spin_unlock_irqrestore(&qp->s_lock, flags);
 384         return ret;
 385 }
 386
 387 /**
 388  * ipath_ud_rcv - receive an incoming UD packet
 389  * @dev: the device the packet came in on
 390  * @hdr: the packet header
 391  * @has_grh: true if the packet has a GRH
 392  * @data: the packet data
 393  * @tlen: the packet length
 394  * @qp: the QP the packet came on
 395  *
 396  * This is called from ipath_qp_rcv() to process an incoming UD packet
 397  * for the given QP.
 398  * Called at interrupt level.
 399  */
 400 void ipath_ud_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr,
 401                   int has_grh, void *data, u32 tlen, struct ipath_qp *qp)
 402 {
 403         struct ipath_other_headers *ohdr;
 404         int opcode;
 405         u32 hdrsize;
 406         u32 pad;
 407         struct ib_wc wc;
 408         u32 qkey;
 409         u32 src_qp;
 410         u16 dlid;
 411         int header_in_data;
 412
 413         /* Check for GRH */
 414         if (!has_grh) {
 415                 ohdr = &hdr->u.oth;
 416                 hdrsize = 8 + 12 + 8;   /* LRH + BTH + DETH */
 417                 qkey = be32_to_cpu(ohdr->u.ud.deth[0]);
 418                 src_qp = be32_to_cpu(ohdr->u.ud.deth[1]);
 419                 header_in_data = 0;
 420         } else {
 421                 ohdr = &hdr->u.l.oth;
 422                 hdrsize = 8 + 40 + 12 + 8; /* LRH + GRH + BTH + DETH */
 423                 /*
 424                  * The header with GRH is 68 bytes and the core driver sets
 425                  * the eager header buffer size to 56 bytes so the last 12
 426                  * bytes of the IB header is in the data buffer.
 427                  */
 428                 header_in_data = dev->dd->ipath_rcvhdrentsize == 16;
 429                 if (header_in_data) {
 430                         qkey = be32_to_cpu(((__be32 *) data)[1]);
 431                         src_qp = be32_to_cpu(((__be32 *) data)[2]);
 432                         data += 12;
 433                 } else {
 434                         qkey = be32_to_cpu(ohdr->u.ud.deth[0]);
 435                         src_qp = be32_to_cpu(ohdr->u.ud.deth[1]);
 436                 }
 437         }
 438         src_qp &= IPATH_QPN_MASK;
 439
 440         /*
 441          * Check that the permissive LID is only used on QP0
 442          * and the QKEY matches (see 9.6.1.4.1 and 9.6.1.5.1).
 443          */
 444         if (qp->ibqp.qp_num) {
 445                 if (unlikely(hdr->lrh[1] == IB_LID_PERMISSIVE ||
 446                              hdr->lrh[3] == IB_LID_PERMISSIVE)) {
 447                         dev->n_pkt_drops++;
 448                         goto bail;
 449                 }
 450                 if (unlikely(qkey != qp->qkey)) {
 451                         dev->qkey_violations++;
 452                         dev->n_pkt_drops++;
 453                         goto bail;
 454                 }
 455         } else if (hdr->lrh[1] == IB_LID_PERMISSIVE ||
 456                    hdr->lrh[3] == IB_LID_PERMISSIVE) {
 457                 struct ib_smp *smp = (struct ib_smp *) data;
 458
 459                 if (smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
 460                         dev->n_pkt_drops++;
 461                         goto bail;
 462                 }
 463         }
 464
 465         /*
 466          * The opcode is in the low byte when its in network order
 467          * (top byte when in host order).
 468          */
 469         opcode = be32_to_cpu(ohdr->bth[0]) >> 24;
 470         if (qp->ibqp.qp_num > 1 &&
 471             opcode == IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE) {
 472                 if (header_in_data) {
 473                         wc.ex.imm_data = *(__be32 *) data;
 474                         data += sizeof(__be32);
 475                 } else
 476                         wc.ex.imm_data = ohdr->u.ud.imm_data;
 477                 wc.wc_flags = IB_WC_WITH_IMM;
 478                 hdrsize += sizeof(u32);
 479         } else if (opcode == IB_OPCODE_UD_SEND_ONLY) {
 480                 wc.ex.imm_data = 0;
 481                 wc.wc_flags = 0;
 482         } else {
 483                 dev->n_pkt_drops++;
 484                 goto bail;
 485         }
 486
 487         /* Get the number of bytes the message was padded by. */
 488         pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
 489         if (unlikely(tlen < (hdrsize + pad + 4))) {
 490                 /* Drop incomplete packets. */
 491                 dev->n_pkt_drops++;
 492                 goto bail;
 493         }
 494         tlen -= hdrsize + pad + 4;
 495
 496         /* Drop invalid MAD packets (see 13.5.3.1). */
 497         if (unlikely((qp->ibqp.qp_num == 0 &&
 498                       (tlen != 256 ||
 499                        (be16_to_cpu(hdr->lrh[0]) >> 12) != 15)) ||
 500                      (qp->ibqp.qp_num == 1 &&
 501                       (tlen != 256 ||
 502                        (be16_to_cpu(hdr->lrh[0]) >> 12) == 15)))) {
 503                 dev->n_pkt_drops++;
 504                 goto bail;
 505         }
 506
 507         /*
 508          * A GRH is expected to preceed the data even if not
 509          * present on the wire.
 510          */
 511         wc.byte_len = tlen + sizeof(struct ib_grh);
 512
 513         /*
 514          * Get the next work request entry to find where to put the data.
 515          */
 516         if (qp->r_flags & IPATH_R_REUSE_SGE)
 517                 qp->r_flags &= ~IPATH_R_REUSE_SGE;
 518         else if (!ipath_get_rwqe(qp, 0)) {
 519                 /*
 520                  * Count VL15 packets dropped due to no receive buffer.
 521                  * Otherwise, count them as buffer overruns since usually,
 522                  * the HW will be able to receive packets even if there are
 523                  * no QPs with posted receive buffers.
 524                  */
 525                 if (qp->ibqp.qp_num == 0)
 526                         dev->n_vl15_dropped++;
 527                 else
 528                         dev->rcv_errors++;
 529                 goto bail;
 530         }
 531         /* Silently drop packets which are too big. */
 532         if (wc.byte_len > qp->r_len) {
 533                 qp->r_flags |= IPATH_R_REUSE_SGE;
 534                 dev->n_pkt_drops++;
 535                 goto bail;
 536         }
 537         if (has_grh) {
 538                 ipath_copy_sge(&qp->r_sge, &hdr->u.l.grh,
 539                                sizeof(struct ib_grh));
 540                 wc.wc_flags |= IB_WC_GRH;
 541         } else
 542                 ipath_skip_sge(&qp->r_sge, sizeof(struct ib_grh));
 543         ipath_copy_sge(&qp->r_sge, data,
 544                        wc.byte_len - sizeof(struct ib_grh));
 545         if (!test_and_clear_bit(IPATH_R_WRID_VALID, &qp->r_aflags))
 546                 goto bail;
 547         wc.wr_id = qp->r_wr_id;
 548         wc.status = IB_WC_SUCCESS;
 549         wc.opcode = IB_WC_RECV;
 550         wc.vendor_err = 0;
 551         wc.qp = &qp->ibqp;
 552         wc.src_qp = src_qp;
 553         wc.pkey_index = 0;
 554         wc.slid = be16_to_cpu(hdr->lrh[3]);
 555         wc.sl = (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF;
 556         dlid = be16_to_cpu(hdr->lrh[1]);
 557         /*
 558          * Save the LMC lower bits if the destination LID is a unicast LID.
 559          */
 560         wc.dlid_path_bits = dlid >= IPATH_MULTICAST_LID_BASE ? 0 :
 561                 dlid & ((1 << dev->dd->ipath_lmc) - 1);
 562         wc.port_num = 1;
 563         /* Signal completion event if the solicited bit is set. */
 564         ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
 565                        (ohdr->bth[0] &
 566                         cpu_to_be32(1 << 23)) != 0);
 567
 568 bail:;
 569 }