1 /* 2 * Copyright (c) 2006, 2007, 2008, 2009 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 <rdma/ib_smi.h> 35 #include <rdma/ib_verbs.h> 36 37 #include "qib.h" 38 #include "qib_mad.h" 39 40 /** 41 * qib_ud_loopback - handle send on loopback QPs 42 * @sqp: the sending QP 43 * @swqe: the send work request 44 * 45 * This is called from qib_make_ud_req() to forward a WQE addressed 46 * to the same HCA. 47 * Note that the receive interrupt handler may be calling qib_ud_rcv() 48 * while this is being called. 49 */ 50 static void qib_ud_loopback(struct rvt_qp *sqp, struct rvt_swqe *swqe) 51 { 52 struct qib_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num); 53 struct qib_pportdata *ppd = ppd_from_ibp(ibp); 54 struct qib_devdata *dd = ppd->dd; 55 struct rvt_dev_info *rdi = &dd->verbs_dev.rdi; 56 struct rvt_qp *qp; 57 struct rdma_ah_attr *ah_attr; 58 unsigned long flags; 59 struct rvt_sge_state ssge; 60 struct rvt_sge *sge; 61 struct ib_wc wc; 62 u32 length; 63 enum ib_qp_type sqptype, dqptype; 64 65 rcu_read_lock(); 66 qp = rvt_lookup_qpn(rdi, &ibp->rvp, swqe->ud_wr.remote_qpn); 67 if (!qp) { 68 ibp->rvp.n_pkt_drops++; 69 goto drop; 70 } 71 72 sqptype = sqp->ibqp.qp_type == IB_QPT_GSI ? 73 IB_QPT_UD : sqp->ibqp.qp_type; 74 dqptype = qp->ibqp.qp_type == IB_QPT_GSI ? 75 IB_QPT_UD : qp->ibqp.qp_type; 76 77 if (dqptype != sqptype || 78 !(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) { 79 ibp->rvp.n_pkt_drops++; 80 goto drop; 81 } 82 83 ah_attr = &ibah_to_rvtah(swqe->ud_wr.ah)->attr; 84 ppd = ppd_from_ibp(ibp); 85 86 if (qp->ibqp.qp_num > 1) { 87 u16 pkey1; 88 u16 pkey2; 89 u16 lid; 90 91 pkey1 = qib_get_pkey(ibp, sqp->s_pkey_index); 92 pkey2 = qib_get_pkey(ibp, qp->s_pkey_index); 93 if (unlikely(!qib_pkey_ok(pkey1, pkey2))) { 94 lid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) & 95 ((1 << ppd->lmc) - 1)); 96 qib_bad_pkey(ibp, pkey1, 97 rdma_ah_get_sl(ah_attr), 98 sqp->ibqp.qp_num, qp->ibqp.qp_num, 99 cpu_to_be16(lid), 100 cpu_to_be16(rdma_ah_get_dlid(ah_attr))); 101 goto drop; 102 } 103 } 104 105 /* 106 * Check that the qkey matches (except for QP0, see 9.6.1.4.1). 107 * Qkeys with the high order bit set mean use the 108 * qkey from the QP context instead of the WR (see 10.2.5). 109 */ 110 if (qp->ibqp.qp_num) { 111 u32 qkey; 112 113 qkey = (int)swqe->ud_wr.remote_qkey < 0 ? 114 sqp->qkey : swqe->ud_wr.remote_qkey; 115 if (unlikely(qkey != qp->qkey)) 116 goto drop; 117 } 118 119 /* 120 * A GRH is expected to precede the data even if not 121 * present on the wire. 122 */ 123 length = swqe->length; 124 memset(&wc, 0, sizeof(wc)); 125 wc.byte_len = length + sizeof(struct ib_grh); 126 127 if (swqe->wr.opcode == IB_WR_SEND_WITH_IMM) { 128 wc.wc_flags = IB_WC_WITH_IMM; 129 wc.ex.imm_data = swqe->wr.ex.imm_data; 130 } 131 132 spin_lock_irqsave(&qp->r_lock, flags); 133 134 /* 135 * Get the next work request entry to find where to put the data. 136 */ 137 if (qp->r_flags & RVT_R_REUSE_SGE) 138 qp->r_flags &= ~RVT_R_REUSE_SGE; 139 else { 140 int ret; 141 142 ret = rvt_get_rwqe(qp, false); 143 if (ret < 0) { 144 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR); 145 goto bail_unlock; 146 } 147 if (!ret) { 148 if (qp->ibqp.qp_num == 0) 149 ibp->rvp.n_vl15_dropped++; 150 goto bail_unlock; 151 } 152 } 153 /* Silently drop packets which are too big. */ 154 if (unlikely(wc.byte_len > qp->r_len)) { 155 qp->r_flags |= RVT_R_REUSE_SGE; 156 ibp->rvp.n_pkt_drops++; 157 goto bail_unlock; 158 } 159 160 if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) { 161 struct ib_grh grh; 162 const struct ib_global_route *grd = rdma_ah_read_grh(ah_attr); 163 164 qib_make_grh(ibp, &grh, grd, 0, 0); 165 qib_copy_sge(&qp->r_sge, &grh, 166 sizeof(grh), 1); 167 wc.wc_flags |= IB_WC_GRH; 168 } else 169 rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true); 170 ssge.sg_list = swqe->sg_list + 1; 171 ssge.sge = *swqe->sg_list; 172 ssge.num_sge = swqe->wr.num_sge; 173 sge = &ssge.sge; 174 while (length) { 175 u32 len = sge->length; 176 177 if (len > length) 178 len = length; 179 if (len > sge->sge_length) 180 len = sge->sge_length; 181 BUG_ON(len == 0); 182 qib_copy_sge(&qp->r_sge, sge->vaddr, len, 1); 183 sge->vaddr += len; 184 sge->length -= len; 185 sge->sge_length -= len; 186 if (sge->sge_length == 0) { 187 if (--ssge.num_sge) 188 *sge = *ssge.sg_list++; 189 } else if (sge->length == 0 && sge->mr->lkey) { 190 if (++sge->n >= RVT_SEGSZ) { 191 if (++sge->m >= sge->mr->mapsz) 192 break; 193 sge->n = 0; 194 } 195 sge->vaddr = 196 sge->mr->map[sge->m]->segs[sge->n].vaddr; 197 sge->length = 198 sge->mr->map[sge->m]->segs[sge->n].length; 199 } 200 length -= len; 201 } 202 rvt_put_ss(&qp->r_sge); 203 if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags)) 204 goto bail_unlock; 205 wc.wr_id = qp->r_wr_id; 206 wc.status = IB_WC_SUCCESS; 207 wc.opcode = IB_WC_RECV; 208 wc.qp = &qp->ibqp; 209 wc.src_qp = sqp->ibqp.qp_num; 210 wc.pkey_index = qp->ibqp.qp_type == IB_QPT_GSI ? 211 swqe->ud_wr.pkey_index : 0; 212 wc.slid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) & 213 ((1 << ppd->lmc) - 1)); 214 wc.sl = rdma_ah_get_sl(ah_attr); 215 wc.dlid_path_bits = rdma_ah_get_dlid(ah_attr) & ((1 << ppd->lmc) - 1); 216 wc.port_num = qp->port_num; 217 /* Signal completion event if the solicited bit is set. */ 218 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc, 219 swqe->wr.send_flags & IB_SEND_SOLICITED); 220 ibp->rvp.n_loop_pkts++; 221 bail_unlock: 222 spin_unlock_irqrestore(&qp->r_lock, flags); 223 drop: 224 rcu_read_unlock(); 225 } 226 227 /** 228 * qib_make_ud_req - construct a UD request packet 229 * @qp: the QP 230 * 231 * Assumes the s_lock is held. 232 * 233 * Return 1 if constructed; otherwise, return 0. 234 */ 235 int qib_make_ud_req(struct rvt_qp *qp, unsigned long *flags) 236 { 237 struct qib_qp_priv *priv = qp->priv; 238 struct ib_other_headers *ohdr; 239 struct rdma_ah_attr *ah_attr; 240 struct qib_pportdata *ppd; 241 struct qib_ibport *ibp; 242 struct rvt_swqe *wqe; 243 u32 nwords; 244 u32 extra_bytes; 245 u32 bth0; 246 u16 lrh0; 247 u16 lid; 248 int ret = 0; 249 int next_cur; 250 251 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_NEXT_SEND_OK)) { 252 if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND)) 253 goto bail; 254 /* We are in the error state, flush the work request. */ 255 if (qp->s_last == READ_ONCE(qp->s_head)) 256 goto bail; 257 /* If DMAs are in progress, we can't flush immediately. */ 258 if (atomic_read(&priv->s_dma_busy)) { 259 qp->s_flags |= RVT_S_WAIT_DMA; 260 goto bail; 261 } 262 wqe = rvt_get_swqe_ptr(qp, qp->s_last); 263 qib_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR); 264 goto done; 265 } 266 267 /* see post_one_send() */ 268 if (qp->s_cur == READ_ONCE(qp->s_head)) 269 goto bail; 270 271 wqe = rvt_get_swqe_ptr(qp, qp->s_cur); 272 next_cur = qp->s_cur + 1; 273 if (next_cur >= qp->s_size) 274 next_cur = 0; 275 276 /* Construct the header. */ 277 ibp = to_iport(qp->ibqp.device, qp->port_num); 278 ppd = ppd_from_ibp(ibp); 279 ah_attr = &ibah_to_rvtah(wqe->ud_wr.ah)->attr; 280 if (rdma_ah_get_dlid(ah_attr) >= be16_to_cpu(IB_MULTICAST_LID_BASE)) { 281 if (rdma_ah_get_dlid(ah_attr) != 282 be16_to_cpu(IB_LID_PERMISSIVE)) 283 this_cpu_inc(ibp->pmastats->n_multicast_xmit); 284 else 285 this_cpu_inc(ibp->pmastats->n_unicast_xmit); 286 } else { 287 this_cpu_inc(ibp->pmastats->n_unicast_xmit); 288 lid = rdma_ah_get_dlid(ah_attr) & ~((1 << ppd->lmc) - 1); 289 if (unlikely(lid == ppd->lid)) { 290 unsigned long tflags = *flags; 291 /* 292 * If DMAs are in progress, we can't generate 293 * a completion for the loopback packet since 294 * it would be out of order. 295 * XXX Instead of waiting, we could queue a 296 * zero length descriptor so we get a callback. 297 */ 298 if (atomic_read(&priv->s_dma_busy)) { 299 qp->s_flags |= RVT_S_WAIT_DMA; 300 goto bail; 301 } 302 qp->s_cur = next_cur; 303 spin_unlock_irqrestore(&qp->s_lock, tflags); 304 qib_ud_loopback(qp, wqe); 305 spin_lock_irqsave(&qp->s_lock, tflags); 306 *flags = tflags; 307 qib_send_complete(qp, wqe, IB_WC_SUCCESS); 308 goto done; 309 } 310 } 311 312 qp->s_cur = next_cur; 313 extra_bytes = -wqe->length & 3; 314 nwords = (wqe->length + extra_bytes) >> 2; 315 316 /* header size in 32-bit words LRH+BTH+DETH = (8+12+8)/4. */ 317 qp->s_hdrwords = 7; 318 qp->s_cur_size = wqe->length; 319 qp->s_cur_sge = &qp->s_sge; 320 qp->s_srate = rdma_ah_get_static_rate(ah_attr); 321 qp->s_wqe = wqe; 322 qp->s_sge.sge = wqe->sg_list[0]; 323 qp->s_sge.sg_list = wqe->sg_list + 1; 324 qp->s_sge.num_sge = wqe->wr.num_sge; 325 qp->s_sge.total_len = wqe->length; 326 327 if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) { 328 /* Header size in 32-bit words. */ 329 qp->s_hdrwords += qib_make_grh(ibp, &priv->s_hdr->u.l.grh, 330 rdma_ah_read_grh(ah_attr), 331 qp->s_hdrwords, nwords); 332 lrh0 = QIB_LRH_GRH; 333 ohdr = &priv->s_hdr->u.l.oth; 334 /* 335 * Don't worry about sending to locally attached multicast 336 * QPs. It is unspecified by the spec. what happens. 337 */ 338 } else { 339 /* Header size in 32-bit words. */ 340 lrh0 = QIB_LRH_BTH; 341 ohdr = &priv->s_hdr->u.oth; 342 } 343 if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) { 344 qp->s_hdrwords++; 345 ohdr->u.ud.imm_data = wqe->wr.ex.imm_data; 346 bth0 = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE << 24; 347 } else 348 bth0 = IB_OPCODE_UD_SEND_ONLY << 24; 349 lrh0 |= rdma_ah_get_sl(ah_attr) << 4; 350 if (qp->ibqp.qp_type == IB_QPT_SMI) 351 lrh0 |= 0xF000; /* Set VL (see ch. 13.5.3.1) */ 352 else 353 lrh0 |= ibp->sl_to_vl[rdma_ah_get_sl(ah_attr)] << 12; 354 priv->s_hdr->lrh[0] = cpu_to_be16(lrh0); 355 priv->s_hdr->lrh[1] = 356 cpu_to_be16(rdma_ah_get_dlid(ah_attr)); /* DEST LID */ 357 priv->s_hdr->lrh[2] = 358 cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC); 359 lid = ppd->lid; 360 if (lid) { 361 lid |= rdma_ah_get_path_bits(ah_attr) & 362 ((1 << ppd->lmc) - 1); 363 priv->s_hdr->lrh[3] = cpu_to_be16(lid); 364 } else 365 priv->s_hdr->lrh[3] = IB_LID_PERMISSIVE; 366 if (wqe->wr.send_flags & IB_SEND_SOLICITED) 367 bth0 |= IB_BTH_SOLICITED; 368 bth0 |= extra_bytes << 20; 369 bth0 |= qp->ibqp.qp_type == IB_QPT_SMI ? QIB_DEFAULT_P_KEY : 370 qib_get_pkey(ibp, qp->ibqp.qp_type == IB_QPT_GSI ? 371 wqe->ud_wr.pkey_index : qp->s_pkey_index); 372 ohdr->bth[0] = cpu_to_be32(bth0); 373 /* 374 * Use the multicast QP if the destination LID is a multicast LID. 375 */ 376 ohdr->bth[1] = rdma_ah_get_dlid(ah_attr) >= 377 be16_to_cpu(IB_MULTICAST_LID_BASE) && 378 rdma_ah_get_dlid(ah_attr) != be16_to_cpu(IB_LID_PERMISSIVE) ? 379 cpu_to_be32(QIB_MULTICAST_QPN) : 380 cpu_to_be32(wqe->ud_wr.remote_qpn); 381 ohdr->bth[2] = cpu_to_be32(wqe->psn & QIB_PSN_MASK); 382 /* 383 * Qkeys with the high order bit set mean use the 384 * qkey from the QP context instead of the WR (see 10.2.5). 385 */ 386 ohdr->u.ud.deth[0] = cpu_to_be32((int)wqe->ud_wr.remote_qkey < 0 ? 387 qp->qkey : wqe->ud_wr.remote_qkey); 388 ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num); 389 390 done: 391 return 1; 392 bail: 393 qp->s_flags &= ~RVT_S_BUSY; 394 return ret; 395 } 396 397 static unsigned qib_lookup_pkey(struct qib_ibport *ibp, u16 pkey) 398 { 399 struct qib_pportdata *ppd = ppd_from_ibp(ibp); 400 struct qib_devdata *dd = ppd->dd; 401 unsigned ctxt = ppd->hw_pidx; 402 unsigned i; 403 404 pkey &= 0x7fff; /* remove limited/full membership bit */ 405 406 for (i = 0; i < ARRAY_SIZE(dd->rcd[ctxt]->pkeys); ++i) 407 if ((dd->rcd[ctxt]->pkeys[i] & 0x7fff) == pkey) 408 return i; 409 410 /* 411 * Should not get here, this means hardware failed to validate pkeys. 412 * Punt and return index 0. 413 */ 414 return 0; 415 } 416 417 /** 418 * qib_ud_rcv - receive an incoming UD packet 419 * @ibp: the port the packet came in on 420 * @hdr: the packet header 421 * @has_grh: true if the packet has a GRH 422 * @data: the packet data 423 * @tlen: the packet length 424 * @qp: the QP the packet came on 425 * 426 * This is called from qib_qp_rcv() to process an incoming UD packet 427 * for the given QP. 428 * Called at interrupt level. 429 */ 430 void qib_ud_rcv(struct qib_ibport *ibp, struct ib_header *hdr, 431 int has_grh, void *data, u32 tlen, struct rvt_qp *qp) 432 { 433 struct ib_other_headers *ohdr; 434 int opcode; 435 u32 hdrsize; 436 u32 pad; 437 struct ib_wc wc; 438 u32 qkey; 439 u32 src_qp; 440 u16 dlid; 441 442 /* Check for GRH */ 443 if (!has_grh) { 444 ohdr = &hdr->u.oth; 445 hdrsize = 8 + 12 + 8; /* LRH + BTH + DETH */ 446 } else { 447 ohdr = &hdr->u.l.oth; 448 hdrsize = 8 + 40 + 12 + 8; /* LRH + GRH + BTH + DETH */ 449 } 450 qkey = be32_to_cpu(ohdr->u.ud.deth[0]); 451 src_qp = be32_to_cpu(ohdr->u.ud.deth[1]) & RVT_QPN_MASK; 452 453 /* 454 * Get the number of bytes the message was padded by 455 * and drop incomplete packets. 456 */ 457 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; 458 if (unlikely(tlen < (hdrsize + pad + 4))) 459 goto drop; 460 461 tlen -= hdrsize + pad + 4; 462 463 /* 464 * Check that the permissive LID is only used on QP0 465 * and the QKEY matches (see 9.6.1.4.1 and 9.6.1.5.1). 466 */ 467 if (qp->ibqp.qp_num) { 468 if (unlikely(hdr->lrh[1] == IB_LID_PERMISSIVE || 469 hdr->lrh[3] == IB_LID_PERMISSIVE)) 470 goto drop; 471 if (qp->ibqp.qp_num > 1) { 472 u16 pkey1, pkey2; 473 474 pkey1 = be32_to_cpu(ohdr->bth[0]); 475 pkey2 = qib_get_pkey(ibp, qp->s_pkey_index); 476 if (unlikely(!qib_pkey_ok(pkey1, pkey2))) { 477 qib_bad_pkey(ibp, 478 pkey1, 479 (be16_to_cpu(hdr->lrh[0]) >> 4) & 480 0xF, 481 src_qp, qp->ibqp.qp_num, 482 hdr->lrh[3], hdr->lrh[1]); 483 return; 484 } 485 } 486 if (unlikely(qkey != qp->qkey)) 487 return; 488 489 /* Drop invalid MAD packets (see 13.5.3.1). */ 490 if (unlikely(qp->ibqp.qp_num == 1 && 491 (tlen != 256 || 492 (be16_to_cpu(hdr->lrh[0]) >> 12) == 15))) 493 goto drop; 494 } else { 495 struct ib_smp *smp; 496 497 /* Drop invalid MAD packets (see 13.5.3.1). */ 498 if (tlen != 256 || (be16_to_cpu(hdr->lrh[0]) >> 12) != 15) 499 goto drop; 500 smp = (struct ib_smp *) data; 501 if ((hdr->lrh[1] == IB_LID_PERMISSIVE || 502 hdr->lrh[3] == IB_LID_PERMISSIVE) && 503 smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 504 goto drop; 505 } 506 507 /* 508 * The opcode is in the low byte when its in network order 509 * (top byte when in host order). 510 */ 511 opcode = be32_to_cpu(ohdr->bth[0]) >> 24; 512 if (qp->ibqp.qp_num > 1 && 513 opcode == IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE) { 514 wc.ex.imm_data = ohdr->u.ud.imm_data; 515 wc.wc_flags = IB_WC_WITH_IMM; 516 tlen -= sizeof(u32); 517 } else if (opcode == IB_OPCODE_UD_SEND_ONLY) { 518 wc.ex.imm_data = 0; 519 wc.wc_flags = 0; 520 } else 521 goto drop; 522 523 /* 524 * A GRH is expected to precede the data even if not 525 * present on the wire. 526 */ 527 wc.byte_len = tlen + sizeof(struct ib_grh); 528 529 /* 530 * Get the next work request entry to find where to put the data. 531 */ 532 if (qp->r_flags & RVT_R_REUSE_SGE) 533 qp->r_flags &= ~RVT_R_REUSE_SGE; 534 else { 535 int ret; 536 537 ret = rvt_get_rwqe(qp, false); 538 if (ret < 0) { 539 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR); 540 return; 541 } 542 if (!ret) { 543 if (qp->ibqp.qp_num == 0) 544 ibp->rvp.n_vl15_dropped++; 545 return; 546 } 547 } 548 /* Silently drop packets which are too big. */ 549 if (unlikely(wc.byte_len > qp->r_len)) { 550 qp->r_flags |= RVT_R_REUSE_SGE; 551 goto drop; 552 } 553 if (has_grh) { 554 qib_copy_sge(&qp->r_sge, &hdr->u.l.grh, 555 sizeof(struct ib_grh), 1); 556 wc.wc_flags |= IB_WC_GRH; 557 } else 558 rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true); 559 qib_copy_sge(&qp->r_sge, data, wc.byte_len - sizeof(struct ib_grh), 1); 560 rvt_put_ss(&qp->r_sge); 561 if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags)) 562 return; 563 wc.wr_id = qp->r_wr_id; 564 wc.status = IB_WC_SUCCESS; 565 wc.opcode = IB_WC_RECV; 566 wc.vendor_err = 0; 567 wc.qp = &qp->ibqp; 568 wc.src_qp = src_qp; 569 wc.pkey_index = qp->ibqp.qp_type == IB_QPT_GSI ? 570 qib_lookup_pkey(ibp, be32_to_cpu(ohdr->bth[0])) : 0; 571 wc.slid = be16_to_cpu(hdr->lrh[3]); 572 wc.sl = (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF; 573 dlid = be16_to_cpu(hdr->lrh[1]); 574 /* 575 * Save the LMC lower bits if the destination LID is a unicast LID. 576 */ 577 wc.dlid_path_bits = dlid >= be16_to_cpu(IB_MULTICAST_LID_BASE) ? 0 : 578 dlid & ((1 << ppd_from_ibp(ibp)->lmc) - 1); 579 wc.port_num = qp->port_num; 580 /* Signal completion event if the solicited bit is set. */ 581 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc, 582 ib_bth_is_solicited(ohdr)); 583 return; 584 585 drop: 586 ibp->rvp.n_pkt_drops++; 587 } 588