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 rvt_copy_sge(qp, &qp->r_sge, &grh, 166 sizeof(grh), true, false); 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 rvt_copy_sge(qp, &qp->r_sge, sge->vaddr, len, true, false); 182 sge->vaddr += len; 183 sge->length -= len; 184 sge->sge_length -= len; 185 if (sge->sge_length == 0) { 186 if (--ssge.num_sge) 187 *sge = *ssge.sg_list++; 188 } else if (sge->length == 0 && sge->mr->lkey) { 189 if (++sge->n >= RVT_SEGSZ) { 190 if (++sge->m >= sge->mr->mapsz) 191 break; 192 sge->n = 0; 193 } 194 sge->vaddr = 195 sge->mr->map[sge->m]->segs[sge->n].vaddr; 196 sge->length = 197 sge->mr->map[sge->m]->segs[sge->n].length; 198 } 199 length -= len; 200 } 201 rvt_put_ss(&qp->r_sge); 202 if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags)) 203 goto bail_unlock; 204 wc.wr_id = qp->r_wr_id; 205 wc.status = IB_WC_SUCCESS; 206 wc.opcode = IB_WC_RECV; 207 wc.qp = &qp->ibqp; 208 wc.src_qp = sqp->ibqp.qp_num; 209 wc.pkey_index = qp->ibqp.qp_type == IB_QPT_GSI ? 210 swqe->ud_wr.pkey_index : 0; 211 wc.slid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) & 212 ((1 << ppd->lmc) - 1)); 213 wc.sl = rdma_ah_get_sl(ah_attr); 214 wc.dlid_path_bits = rdma_ah_get_dlid(ah_attr) & ((1 << ppd->lmc) - 1); 215 wc.port_num = qp->port_num; 216 /* Signal completion event if the solicited bit is set. */ 217 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc, 218 swqe->wr.send_flags & IB_SEND_SOLICITED); 219 ibp->rvp.n_loop_pkts++; 220 bail_unlock: 221 spin_unlock_irqrestore(&qp->r_lock, flags); 222 drop: 223 rcu_read_unlock(); 224 } 225 226 /** 227 * qib_make_ud_req - construct a UD request packet 228 * @qp: the QP 229 * 230 * Assumes the s_lock is held. 231 * 232 * Return 1 if constructed; otherwise, return 0. 233 */ 234 int qib_make_ud_req(struct rvt_qp *qp, unsigned long *flags) 235 { 236 struct qib_qp_priv *priv = qp->priv; 237 struct ib_other_headers *ohdr; 238 struct rdma_ah_attr *ah_attr; 239 struct qib_pportdata *ppd; 240 struct qib_ibport *ibp; 241 struct rvt_swqe *wqe; 242 u32 nwords; 243 u32 extra_bytes; 244 u32 bth0; 245 u16 lrh0; 246 u16 lid; 247 int ret = 0; 248 int next_cur; 249 250 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_NEXT_SEND_OK)) { 251 if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND)) 252 goto bail; 253 /* We are in the error state, flush the work request. */ 254 if (qp->s_last == READ_ONCE(qp->s_head)) 255 goto bail; 256 /* If DMAs are in progress, we can't flush immediately. */ 257 if (atomic_read(&priv->s_dma_busy)) { 258 qp->s_flags |= RVT_S_WAIT_DMA; 259 goto bail; 260 } 261 wqe = rvt_get_swqe_ptr(qp, qp->s_last); 262 rvt_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR); 263 goto done; 264 } 265 266 /* see post_one_send() */ 267 if (qp->s_cur == READ_ONCE(qp->s_head)) 268 goto bail; 269 270 wqe = rvt_get_swqe_ptr(qp, qp->s_cur); 271 next_cur = qp->s_cur + 1; 272 if (next_cur >= qp->s_size) 273 next_cur = 0; 274 275 /* Construct the header. */ 276 ibp = to_iport(qp->ibqp.device, qp->port_num); 277 ppd = ppd_from_ibp(ibp); 278 ah_attr = &ibah_to_rvtah(wqe->ud_wr.ah)->attr; 279 if (rdma_ah_get_dlid(ah_attr) >= be16_to_cpu(IB_MULTICAST_LID_BASE)) { 280 if (rdma_ah_get_dlid(ah_attr) != 281 be16_to_cpu(IB_LID_PERMISSIVE)) 282 this_cpu_inc(ibp->pmastats->n_multicast_xmit); 283 else 284 this_cpu_inc(ibp->pmastats->n_unicast_xmit); 285 } else { 286 this_cpu_inc(ibp->pmastats->n_unicast_xmit); 287 lid = rdma_ah_get_dlid(ah_attr) & ~((1 << ppd->lmc) - 1); 288 if (unlikely(lid == ppd->lid)) { 289 unsigned long tflags = *flags; 290 /* 291 * If DMAs are in progress, we can't generate 292 * a completion for the loopback packet since 293 * it would be out of order. 294 * XXX Instead of waiting, we could queue a 295 * zero length descriptor so we get a callback. 296 */ 297 if (atomic_read(&priv->s_dma_busy)) { 298 qp->s_flags |= RVT_S_WAIT_DMA; 299 goto bail; 300 } 301 qp->s_cur = next_cur; 302 spin_unlock_irqrestore(&qp->s_lock, tflags); 303 qib_ud_loopback(qp, wqe); 304 spin_lock_irqsave(&qp->s_lock, tflags); 305 *flags = tflags; 306 rvt_send_complete(qp, wqe, IB_WC_SUCCESS); 307 goto done; 308 } 309 } 310 311 qp->s_cur = next_cur; 312 extra_bytes = -wqe->length & 3; 313 nwords = (wqe->length + extra_bytes) >> 2; 314 315 /* header size in 32-bit words LRH+BTH+DETH = (8+12+8)/4. */ 316 qp->s_hdrwords = 7; 317 qp->s_cur_size = wqe->length; 318 qp->s_cur_sge = &qp->s_sge; 319 qp->s_srate = rdma_ah_get_static_rate(ah_attr); 320 qp->s_wqe = wqe; 321 qp->s_sge.sge = wqe->sg_list[0]; 322 qp->s_sge.sg_list = wqe->sg_list + 1; 323 qp->s_sge.num_sge = wqe->wr.num_sge; 324 qp->s_sge.total_len = wqe->length; 325 326 if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) { 327 /* Header size in 32-bit words. */ 328 qp->s_hdrwords += qib_make_grh(ibp, &priv->s_hdr->u.l.grh, 329 rdma_ah_read_grh(ah_attr), 330 qp->s_hdrwords, nwords); 331 lrh0 = QIB_LRH_GRH; 332 ohdr = &priv->s_hdr->u.l.oth; 333 /* 334 * Don't worry about sending to locally attached multicast 335 * QPs. It is unspecified by the spec. what happens. 336 */ 337 } else { 338 /* Header size in 32-bit words. */ 339 lrh0 = QIB_LRH_BTH; 340 ohdr = &priv->s_hdr->u.oth; 341 } 342 if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) { 343 qp->s_hdrwords++; 344 ohdr->u.ud.imm_data = wqe->wr.ex.imm_data; 345 bth0 = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE << 24; 346 } else 347 bth0 = IB_OPCODE_UD_SEND_ONLY << 24; 348 lrh0 |= rdma_ah_get_sl(ah_attr) << 4; 349 if (qp->ibqp.qp_type == IB_QPT_SMI) 350 lrh0 |= 0xF000; /* Set VL (see ch. 13.5.3.1) */ 351 else 352 lrh0 |= ibp->sl_to_vl[rdma_ah_get_sl(ah_attr)] << 12; 353 priv->s_hdr->lrh[0] = cpu_to_be16(lrh0); 354 priv->s_hdr->lrh[1] = 355 cpu_to_be16(rdma_ah_get_dlid(ah_attr)); /* DEST LID */ 356 priv->s_hdr->lrh[2] = 357 cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC); 358 lid = ppd->lid; 359 if (lid) { 360 lid |= rdma_ah_get_path_bits(ah_attr) & 361 ((1 << ppd->lmc) - 1); 362 priv->s_hdr->lrh[3] = cpu_to_be16(lid); 363 } else 364 priv->s_hdr->lrh[3] = IB_LID_PERMISSIVE; 365 if (wqe->wr.send_flags & IB_SEND_SOLICITED) 366 bth0 |= IB_BTH_SOLICITED; 367 bth0 |= extra_bytes << 20; 368 bth0 |= qp->ibqp.qp_type == IB_QPT_SMI ? QIB_DEFAULT_P_KEY : 369 qib_get_pkey(ibp, qp->ibqp.qp_type == IB_QPT_GSI ? 370 wqe->ud_wr.pkey_index : qp->s_pkey_index); 371 ohdr->bth[0] = cpu_to_be32(bth0); 372 /* 373 * Use the multicast QP if the destination LID is a multicast LID. 374 */ 375 ohdr->bth[1] = rdma_ah_get_dlid(ah_attr) >= 376 be16_to_cpu(IB_MULTICAST_LID_BASE) && 377 rdma_ah_get_dlid(ah_attr) != be16_to_cpu(IB_LID_PERMISSIVE) ? 378 cpu_to_be32(QIB_MULTICAST_QPN) : 379 cpu_to_be32(wqe->ud_wr.remote_qpn); 380 ohdr->bth[2] = cpu_to_be32(wqe->psn & QIB_PSN_MASK); 381 /* 382 * Qkeys with the high order bit set mean use the 383 * qkey from the QP context instead of the WR (see 10.2.5). 384 */ 385 ohdr->u.ud.deth[0] = cpu_to_be32((int)wqe->ud_wr.remote_qkey < 0 ? 386 qp->qkey : wqe->ud_wr.remote_qkey); 387 ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num); 388 389 done: 390 return 1; 391 bail: 392 qp->s_flags &= ~RVT_S_BUSY; 393 return ret; 394 } 395 396 static unsigned qib_lookup_pkey(struct qib_ibport *ibp, u16 pkey) 397 { 398 struct qib_pportdata *ppd = ppd_from_ibp(ibp); 399 struct qib_devdata *dd = ppd->dd; 400 unsigned ctxt = ppd->hw_pidx; 401 unsigned i; 402 403 pkey &= 0x7fff; /* remove limited/full membership bit */ 404 405 for (i = 0; i < ARRAY_SIZE(dd->rcd[ctxt]->pkeys); ++i) 406 if ((dd->rcd[ctxt]->pkeys[i] & 0x7fff) == pkey) 407 return i; 408 409 /* 410 * Should not get here, this means hardware failed to validate pkeys. 411 * Punt and return index 0. 412 */ 413 return 0; 414 } 415 416 /** 417 * qib_ud_rcv - receive an incoming UD packet 418 * @ibp: the port the packet came in on 419 * @hdr: the packet header 420 * @has_grh: true if the packet has a GRH 421 * @data: the packet data 422 * @tlen: the packet length 423 * @qp: the QP the packet came on 424 * 425 * This is called from qib_qp_rcv() to process an incoming UD packet 426 * for the given QP. 427 * Called at interrupt level. 428 */ 429 void qib_ud_rcv(struct qib_ibport *ibp, struct ib_header *hdr, 430 int has_grh, void *data, u32 tlen, struct rvt_qp *qp) 431 { 432 struct ib_other_headers *ohdr; 433 int opcode; 434 u32 hdrsize; 435 u32 pad; 436 struct ib_wc wc; 437 u32 qkey; 438 u32 src_qp; 439 u16 dlid; 440 441 /* Check for GRH */ 442 if (!has_grh) { 443 ohdr = &hdr->u.oth; 444 hdrsize = 8 + 12 + 8; /* LRH + BTH + DETH */ 445 } else { 446 ohdr = &hdr->u.l.oth; 447 hdrsize = 8 + 40 + 12 + 8; /* LRH + GRH + BTH + DETH */ 448 } 449 qkey = be32_to_cpu(ohdr->u.ud.deth[0]); 450 src_qp = be32_to_cpu(ohdr->u.ud.deth[1]) & RVT_QPN_MASK; 451 452 /* 453 * Get the number of bytes the message was padded by 454 * and drop incomplete packets. 455 */ 456 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; 457 if (unlikely(tlen < (hdrsize + pad + 4))) 458 goto drop; 459 460 tlen -= hdrsize + pad + 4; 461 462 /* 463 * Check that the permissive LID is only used on QP0 464 * and the QKEY matches (see 9.6.1.4.1 and 9.6.1.5.1). 465 */ 466 if (qp->ibqp.qp_num) { 467 if (unlikely(hdr->lrh[1] == IB_LID_PERMISSIVE || 468 hdr->lrh[3] == IB_LID_PERMISSIVE)) 469 goto drop; 470 if (qp->ibqp.qp_num > 1) { 471 u16 pkey1, pkey2; 472 473 pkey1 = be32_to_cpu(ohdr->bth[0]); 474 pkey2 = qib_get_pkey(ibp, qp->s_pkey_index); 475 if (unlikely(!qib_pkey_ok(pkey1, pkey2))) { 476 qib_bad_pkey(ibp, 477 pkey1, 478 (be16_to_cpu(hdr->lrh[0]) >> 4) & 479 0xF, 480 src_qp, qp->ibqp.qp_num, 481 hdr->lrh[3], hdr->lrh[1]); 482 return; 483 } 484 } 485 if (unlikely(qkey != qp->qkey)) 486 return; 487 488 /* Drop invalid MAD packets (see 13.5.3.1). */ 489 if (unlikely(qp->ibqp.qp_num == 1 && 490 (tlen != 256 || 491 (be16_to_cpu(hdr->lrh[0]) >> 12) == 15))) 492 goto drop; 493 } else { 494 struct ib_smp *smp; 495 496 /* Drop invalid MAD packets (see 13.5.3.1). */ 497 if (tlen != 256 || (be16_to_cpu(hdr->lrh[0]) >> 12) != 15) 498 goto drop; 499 smp = (struct ib_smp *) data; 500 if ((hdr->lrh[1] == IB_LID_PERMISSIVE || 501 hdr->lrh[3] == IB_LID_PERMISSIVE) && 502 smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 503 goto drop; 504 } 505 506 /* 507 * The opcode is in the low byte when its in network order 508 * (top byte when in host order). 509 */ 510 opcode = be32_to_cpu(ohdr->bth[0]) >> 24; 511 if (qp->ibqp.qp_num > 1 && 512 opcode == IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE) { 513 wc.ex.imm_data = ohdr->u.ud.imm_data; 514 wc.wc_flags = IB_WC_WITH_IMM; 515 tlen -= sizeof(u32); 516 } else if (opcode == IB_OPCODE_UD_SEND_ONLY) { 517 wc.ex.imm_data = 0; 518 wc.wc_flags = 0; 519 } else 520 goto drop; 521 522 /* 523 * A GRH is expected to precede the data even if not 524 * present on the wire. 525 */ 526 wc.byte_len = tlen + sizeof(struct ib_grh); 527 528 /* 529 * Get the next work request entry to find where to put the data. 530 */ 531 if (qp->r_flags & RVT_R_REUSE_SGE) 532 qp->r_flags &= ~RVT_R_REUSE_SGE; 533 else { 534 int ret; 535 536 ret = rvt_get_rwqe(qp, false); 537 if (ret < 0) { 538 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR); 539 return; 540 } 541 if (!ret) { 542 if (qp->ibqp.qp_num == 0) 543 ibp->rvp.n_vl15_dropped++; 544 return; 545 } 546 } 547 /* Silently drop packets which are too big. */ 548 if (unlikely(wc.byte_len > qp->r_len)) { 549 qp->r_flags |= RVT_R_REUSE_SGE; 550 goto drop; 551 } 552 if (has_grh) { 553 rvt_copy_sge(qp, &qp->r_sge, &hdr->u.l.grh, 554 sizeof(struct ib_grh), true, false); 555 wc.wc_flags |= IB_WC_GRH; 556 } else 557 rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true); 558 rvt_copy_sge(qp, &qp->r_sge, data, wc.byte_len - sizeof(struct ib_grh), 559 true, false); 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