1 /* 2 * Copyright (c) 2012 - 2019 Intel Corporation. All rights reserved. 3 * Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved. 4 * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved. 5 * 6 * This software is available to you under a choice of one of two 7 * licenses. You may choose to be licensed under the terms of the GNU 8 * General Public License (GPL) Version 2, available from the file 9 * COPYING in the main directory of this source tree, or the 10 * OpenIB.org BSD license below: 11 * 12 * Redistribution and use in source and binary forms, with or 13 * without modification, are permitted provided that the following 14 * conditions are met: 15 * 16 * - Redistributions of source code must retain the above 17 * copyright notice, this list of conditions and the following 18 * disclaimer. 19 * 20 * - Redistributions in binary form must reproduce the above 21 * copyright notice, this list of conditions and the following 22 * disclaimer in the documentation and/or other materials 23 * provided with the distribution. 24 * 25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 32 * SOFTWARE. 33 */ 34 35 #include <rdma/ib_smi.h> 36 #include <rdma/ib_verbs.h> 37 38 #include "qib.h" 39 #include "qib_mad.h" 40 41 /** 42 * qib_ud_loopback - handle send on loopback QPs 43 * @sqp: the sending QP 44 * @swqe: the send work request 45 * 46 * This is called from qib_make_ud_req() to forward a WQE addressed 47 * to the same HCA. 48 * Note that the receive interrupt handler may be calling qib_ud_rcv() 49 * while this is being called. 50 */ 51 static void qib_ud_loopback(struct rvt_qp *sqp, struct rvt_swqe *swqe) 52 { 53 struct qib_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num); 54 struct qib_pportdata *ppd = ppd_from_ibp(ibp); 55 struct qib_devdata *dd = ppd->dd; 56 struct rvt_dev_info *rdi = &dd->verbs_dev.rdi; 57 struct rvt_qp *qp; 58 struct rdma_ah_attr *ah_attr; 59 unsigned long flags; 60 struct rvt_sge_state ssge; 61 struct rvt_sge *sge; 62 struct ib_wc wc; 63 u32 length; 64 enum ib_qp_type sqptype, dqptype; 65 66 rcu_read_lock(); 67 qp = rvt_lookup_qpn(rdi, &ibp->rvp, rvt_get_swqe_remote_qpn(swqe)); 68 if (!qp) { 69 ibp->rvp.n_pkt_drops++; 70 goto drop; 71 } 72 73 sqptype = sqp->ibqp.qp_type == IB_QPT_GSI ? 74 IB_QPT_UD : sqp->ibqp.qp_type; 75 dqptype = qp->ibqp.qp_type == IB_QPT_GSI ? 76 IB_QPT_UD : qp->ibqp.qp_type; 77 78 if (dqptype != sqptype || 79 !(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) { 80 ibp->rvp.n_pkt_drops++; 81 goto drop; 82 } 83 84 ah_attr = rvt_get_swqe_ah_attr(swqe); 85 ppd = ppd_from_ibp(ibp); 86 87 if (qp->ibqp.qp_num > 1) { 88 u16 pkey1; 89 u16 pkey2; 90 u16 lid; 91 92 pkey1 = qib_get_pkey(ibp, sqp->s_pkey_index); 93 pkey2 = qib_get_pkey(ibp, qp->s_pkey_index); 94 if (unlikely(!qib_pkey_ok(pkey1, pkey2))) { 95 lid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) & 96 ((1 << ppd->lmc) - 1)); 97 qib_bad_pkey(ibp, pkey1, 98 rdma_ah_get_sl(ah_attr), 99 sqp->ibqp.qp_num, qp->ibqp.qp_num, 100 cpu_to_be16(lid), 101 cpu_to_be16(rdma_ah_get_dlid(ah_attr))); 102 goto drop; 103 } 104 } 105 106 /* 107 * Check that the qkey matches (except for QP0, see 9.6.1.4.1). 108 * Qkeys with the high order bit set mean use the 109 * qkey from the QP context instead of the WR (see 10.2.5). 110 */ 111 if (qp->ibqp.qp_num) { 112 u32 qkey; 113 114 qkey = (int)rvt_get_swqe_remote_qkey(swqe) < 0 ? 115 sqp->qkey : rvt_get_swqe_remote_qkey(swqe); 116 if (unlikely(qkey != qp->qkey)) 117 goto drop; 118 } 119 120 /* 121 * A GRH is expected to precede the data even if not 122 * present on the wire. 123 */ 124 length = swqe->length; 125 memset(&wc, 0, sizeof(wc)); 126 wc.byte_len = length + sizeof(struct ib_grh); 127 128 if (swqe->wr.opcode == IB_WR_SEND_WITH_IMM) { 129 wc.wc_flags = IB_WC_WITH_IMM; 130 wc.ex.imm_data = swqe->wr.ex.imm_data; 131 } 132 133 spin_lock_irqsave(&qp->r_lock, flags); 134 135 /* 136 * Get the next work request entry to find where to put the data. 137 */ 138 if (qp->r_flags & RVT_R_REUSE_SGE) 139 qp->r_flags &= ~RVT_R_REUSE_SGE; 140 else { 141 int ret; 142 143 ret = rvt_get_rwqe(qp, false); 144 if (ret < 0) { 145 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR); 146 goto bail_unlock; 147 } 148 if (!ret) { 149 if (qp->ibqp.qp_num == 0) 150 ibp->rvp.n_vl15_dropped++; 151 goto bail_unlock; 152 } 153 } 154 /* Silently drop packets which are too big. */ 155 if (unlikely(wc.byte_len > qp->r_len)) { 156 qp->r_flags |= RVT_R_REUSE_SGE; 157 ibp->rvp.n_pkt_drops++; 158 goto bail_unlock; 159 } 160 161 if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) { 162 struct ib_grh grh; 163 const struct ib_global_route *grd = rdma_ah_read_grh(ah_attr); 164 165 qib_make_grh(ibp, &grh, grd, 0, 0); 166 rvt_copy_sge(qp, &qp->r_sge, &grh, 167 sizeof(grh), true, false); 168 wc.wc_flags |= IB_WC_GRH; 169 } else 170 rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true); 171 ssge.sg_list = swqe->sg_list + 1; 172 ssge.sge = *swqe->sg_list; 173 ssge.num_sge = swqe->wr.num_sge; 174 sge = &ssge.sge; 175 while (length) { 176 u32 len = rvt_get_sge_length(sge, length); 177 178 rvt_copy_sge(qp, &qp->r_sge, sge->vaddr, len, true, false); 179 sge->vaddr += len; 180 sge->length -= len; 181 sge->sge_length -= len; 182 if (sge->sge_length == 0) { 183 if (--ssge.num_sge) 184 *sge = *ssge.sg_list++; 185 } else if (sge->length == 0 && sge->mr->lkey) { 186 if (++sge->n >= RVT_SEGSZ) { 187 if (++sge->m >= sge->mr->mapsz) 188 break; 189 sge->n = 0; 190 } 191 sge->vaddr = 192 sge->mr->map[sge->m]->segs[sge->n].vaddr; 193 sge->length = 194 sge->mr->map[sge->m]->segs[sge->n].length; 195 } 196 length -= len; 197 } 198 rvt_put_ss(&qp->r_sge); 199 if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags)) 200 goto bail_unlock; 201 wc.wr_id = qp->r_wr_id; 202 wc.status = IB_WC_SUCCESS; 203 wc.opcode = IB_WC_RECV; 204 wc.qp = &qp->ibqp; 205 wc.src_qp = sqp->ibqp.qp_num; 206 wc.pkey_index = qp->ibqp.qp_type == IB_QPT_GSI ? 207 rvt_get_swqe_pkey_index(swqe) : 0; 208 wc.slid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) & 209 ((1 << ppd->lmc) - 1)); 210 wc.sl = rdma_ah_get_sl(ah_attr); 211 wc.dlid_path_bits = rdma_ah_get_dlid(ah_attr) & ((1 << ppd->lmc) - 1); 212 wc.port_num = qp->port_num; 213 /* Signal completion event if the solicited bit is set. */ 214 rvt_recv_cq(qp, &wc, swqe->wr.send_flags & IB_SEND_SOLICITED); 215 ibp->rvp.n_loop_pkts++; 216 bail_unlock: 217 spin_unlock_irqrestore(&qp->r_lock, flags); 218 drop: 219 rcu_read_unlock(); 220 } 221 222 /** 223 * qib_make_ud_req - construct a UD request packet 224 * @qp: the QP 225 * @flags: flags to modify and pass back to caller 226 * 227 * Assumes the s_lock is held. 228 * 229 * Return 1 if constructed; otherwise, return 0. 230 */ 231 int qib_make_ud_req(struct rvt_qp *qp, unsigned long *flags) 232 { 233 struct qib_qp_priv *priv = qp->priv; 234 struct ib_other_headers *ohdr; 235 struct rdma_ah_attr *ah_attr; 236 struct qib_pportdata *ppd; 237 struct qib_ibport *ibp; 238 struct rvt_swqe *wqe; 239 u32 nwords; 240 u32 extra_bytes; 241 u32 bth0; 242 u16 lrh0; 243 u16 lid; 244 int ret = 0; 245 int next_cur; 246 247 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_NEXT_SEND_OK)) { 248 if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND)) 249 goto bail; 250 /* We are in the error state, flush the work request. */ 251 if (qp->s_last == READ_ONCE(qp->s_head)) 252 goto bail; 253 /* If DMAs are in progress, we can't flush immediately. */ 254 if (atomic_read(&priv->s_dma_busy)) { 255 qp->s_flags |= RVT_S_WAIT_DMA; 256 goto bail; 257 } 258 wqe = rvt_get_swqe_ptr(qp, qp->s_last); 259 rvt_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR); 260 goto done; 261 } 262 263 /* see post_one_send() */ 264 if (qp->s_cur == READ_ONCE(qp->s_head)) 265 goto bail; 266 267 wqe = rvt_get_swqe_ptr(qp, qp->s_cur); 268 next_cur = qp->s_cur + 1; 269 if (next_cur >= qp->s_size) 270 next_cur = 0; 271 272 /* Construct the header. */ 273 ibp = to_iport(qp->ibqp.device, qp->port_num); 274 ppd = ppd_from_ibp(ibp); 275 ah_attr = rvt_get_swqe_ah_attr(wqe); 276 if (rdma_ah_get_dlid(ah_attr) >= be16_to_cpu(IB_MULTICAST_LID_BASE)) { 277 if (rdma_ah_get_dlid(ah_attr) != 278 be16_to_cpu(IB_LID_PERMISSIVE)) 279 this_cpu_inc(ibp->pmastats->n_multicast_xmit); 280 else 281 this_cpu_inc(ibp->pmastats->n_unicast_xmit); 282 } else { 283 this_cpu_inc(ibp->pmastats->n_unicast_xmit); 284 lid = rdma_ah_get_dlid(ah_attr) & ~((1 << ppd->lmc) - 1); 285 if (unlikely(lid == ppd->lid)) { 286 unsigned long tflags = *flags; 287 /* 288 * If DMAs are in progress, we can't generate 289 * a completion for the loopback packet since 290 * it would be out of order. 291 * XXX Instead of waiting, we could queue a 292 * zero length descriptor so we get a callback. 293 */ 294 if (atomic_read(&priv->s_dma_busy)) { 295 qp->s_flags |= RVT_S_WAIT_DMA; 296 goto bail; 297 } 298 qp->s_cur = next_cur; 299 spin_unlock_irqrestore(&qp->s_lock, tflags); 300 qib_ud_loopback(qp, wqe); 301 spin_lock_irqsave(&qp->s_lock, tflags); 302 *flags = tflags; 303 rvt_send_complete(qp, wqe, IB_WC_SUCCESS); 304 goto done; 305 } 306 } 307 308 qp->s_cur = next_cur; 309 extra_bytes = -wqe->length & 3; 310 nwords = (wqe->length + extra_bytes) >> 2; 311 312 /* header size in 32-bit words LRH+BTH+DETH = (8+12+8)/4. */ 313 qp->s_hdrwords = 7; 314 qp->s_cur_size = wqe->length; 315 qp->s_cur_sge = &qp->s_sge; 316 qp->s_srate = rdma_ah_get_static_rate(ah_attr); 317 qp->s_wqe = wqe; 318 qp->s_sge.sge = wqe->sg_list[0]; 319 qp->s_sge.sg_list = wqe->sg_list + 1; 320 qp->s_sge.num_sge = wqe->wr.num_sge; 321 qp->s_sge.total_len = wqe->length; 322 323 if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) { 324 /* Header size in 32-bit words. */ 325 qp->s_hdrwords += qib_make_grh(ibp, &priv->s_hdr->u.l.grh, 326 rdma_ah_read_grh(ah_attr), 327 qp->s_hdrwords, nwords); 328 lrh0 = QIB_LRH_GRH; 329 ohdr = &priv->s_hdr->u.l.oth; 330 /* 331 * Don't worry about sending to locally attached multicast 332 * QPs. It is unspecified by the spec. what happens. 333 */ 334 } else { 335 /* Header size in 32-bit words. */ 336 lrh0 = QIB_LRH_BTH; 337 ohdr = &priv->s_hdr->u.oth; 338 } 339 if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) { 340 qp->s_hdrwords++; 341 ohdr->u.ud.imm_data = wqe->wr.ex.imm_data; 342 bth0 = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE << 24; 343 } else 344 bth0 = IB_OPCODE_UD_SEND_ONLY << 24; 345 lrh0 |= rdma_ah_get_sl(ah_attr) << 4; 346 if (qp->ibqp.qp_type == IB_QPT_SMI) 347 lrh0 |= 0xF000; /* Set VL (see ch. 13.5.3.1) */ 348 else 349 lrh0 |= ibp->sl_to_vl[rdma_ah_get_sl(ah_attr)] << 12; 350 priv->s_hdr->lrh[0] = cpu_to_be16(lrh0); 351 priv->s_hdr->lrh[1] = 352 cpu_to_be16(rdma_ah_get_dlid(ah_attr)); /* DEST LID */ 353 priv->s_hdr->lrh[2] = 354 cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC); 355 lid = ppd->lid; 356 if (lid) { 357 lid |= rdma_ah_get_path_bits(ah_attr) & 358 ((1 << ppd->lmc) - 1); 359 priv->s_hdr->lrh[3] = cpu_to_be16(lid); 360 } else 361 priv->s_hdr->lrh[3] = IB_LID_PERMISSIVE; 362 if (wqe->wr.send_flags & IB_SEND_SOLICITED) 363 bth0 |= IB_BTH_SOLICITED; 364 bth0 |= extra_bytes << 20; 365 bth0 |= qp->ibqp.qp_type == IB_QPT_SMI ? QIB_DEFAULT_P_KEY : 366 qib_get_pkey(ibp, qp->ibqp.qp_type == IB_QPT_GSI ? 367 rvt_get_swqe_pkey_index(wqe) : qp->s_pkey_index); 368 ohdr->bth[0] = cpu_to_be32(bth0); 369 /* 370 * Use the multicast QP if the destination LID is a multicast LID. 371 */ 372 ohdr->bth[1] = rdma_ah_get_dlid(ah_attr) >= 373 be16_to_cpu(IB_MULTICAST_LID_BASE) && 374 rdma_ah_get_dlid(ah_attr) != be16_to_cpu(IB_LID_PERMISSIVE) ? 375 cpu_to_be32(QIB_MULTICAST_QPN) : 376 cpu_to_be32(rvt_get_swqe_remote_qpn(wqe)); 377 ohdr->bth[2] = cpu_to_be32(wqe->psn & QIB_PSN_MASK); 378 /* 379 * Qkeys with the high order bit set mean use the 380 * qkey from the QP context instead of the WR (see 10.2.5). 381 */ 382 ohdr->u.ud.deth[0] = 383 cpu_to_be32((int)rvt_get_swqe_remote_qkey(wqe) < 0 ? qp->qkey : 384 rvt_get_swqe_remote_qkey(wqe)); 385 ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num); 386 387 done: 388 return 1; 389 bail: 390 qp->s_flags &= ~RVT_S_BUSY; 391 return ret; 392 } 393 394 static unsigned qib_lookup_pkey(struct qib_ibport *ibp, u16 pkey) 395 { 396 struct qib_pportdata *ppd = ppd_from_ibp(ibp); 397 struct qib_devdata *dd = ppd->dd; 398 unsigned ctxt = ppd->hw_pidx; 399 unsigned i; 400 401 pkey &= 0x7fff; /* remove limited/full membership bit */ 402 403 for (i = 0; i < ARRAY_SIZE(dd->rcd[ctxt]->pkeys); ++i) 404 if ((dd->rcd[ctxt]->pkeys[i] & 0x7fff) == pkey) 405 return i; 406 407 /* 408 * Should not get here, this means hardware failed to validate pkeys. 409 * Punt and return index 0. 410 */ 411 return 0; 412 } 413 414 /** 415 * qib_ud_rcv - receive an incoming UD packet 416 * @ibp: the port the packet came in on 417 * @hdr: the packet header 418 * @has_grh: true if the packet has a GRH 419 * @data: the packet data 420 * @tlen: the packet length 421 * @qp: the QP the packet came on 422 * 423 * This is called from qib_qp_rcv() to process an incoming UD packet 424 * for the given QP. 425 * Called at interrupt level. 426 */ 427 void qib_ud_rcv(struct qib_ibport *ibp, struct ib_header *hdr, 428 int has_grh, void *data, u32 tlen, struct rvt_qp *qp) 429 { 430 struct ib_other_headers *ohdr; 431 int opcode; 432 u32 hdrsize; 433 u32 pad; 434 struct ib_wc wc; 435 u32 qkey; 436 u32 src_qp; 437 u16 dlid; 438 439 /* Check for GRH */ 440 if (!has_grh) { 441 ohdr = &hdr->u.oth; 442 hdrsize = 8 + 12 + 8; /* LRH + BTH + DETH */ 443 } else { 444 ohdr = &hdr->u.l.oth; 445 hdrsize = 8 + 40 + 12 + 8; /* LRH + GRH + BTH + DETH */ 446 } 447 qkey = be32_to_cpu(ohdr->u.ud.deth[0]); 448 src_qp = be32_to_cpu(ohdr->u.ud.deth[1]) & RVT_QPN_MASK; 449 450 /* 451 * Get the number of bytes the message was padded by 452 * and drop incomplete packets. 453 */ 454 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; 455 if (unlikely(tlen < (hdrsize + pad + 4))) 456 goto drop; 457 458 tlen -= hdrsize + pad + 4; 459 460 /* 461 * Check that the permissive LID is only used on QP0 462 * and the QKEY matches (see 9.6.1.4.1 and 9.6.1.5.1). 463 */ 464 if (qp->ibqp.qp_num) { 465 if (unlikely(hdr->lrh[1] == IB_LID_PERMISSIVE || 466 hdr->lrh[3] == IB_LID_PERMISSIVE)) 467 goto drop; 468 if (qp->ibqp.qp_num > 1) { 469 u16 pkey1, pkey2; 470 471 pkey1 = be32_to_cpu(ohdr->bth[0]); 472 pkey2 = qib_get_pkey(ibp, qp->s_pkey_index); 473 if (unlikely(!qib_pkey_ok(pkey1, pkey2))) { 474 qib_bad_pkey(ibp, 475 pkey1, 476 (be16_to_cpu(hdr->lrh[0]) >> 4) & 477 0xF, 478 src_qp, qp->ibqp.qp_num, 479 hdr->lrh[3], hdr->lrh[1]); 480 return; 481 } 482 } 483 if (unlikely(qkey != qp->qkey)) 484 return; 485 486 /* Drop invalid MAD packets (see 13.5.3.1). */ 487 if (unlikely(qp->ibqp.qp_num == 1 && 488 (tlen != 256 || 489 (be16_to_cpu(hdr->lrh[0]) >> 12) == 15))) 490 goto drop; 491 } else { 492 struct ib_smp *smp; 493 494 /* Drop invalid MAD packets (see 13.5.3.1). */ 495 if (tlen != 256 || (be16_to_cpu(hdr->lrh[0]) >> 12) != 15) 496 goto drop; 497 smp = (struct ib_smp *) data; 498 if ((hdr->lrh[1] == IB_LID_PERMISSIVE || 499 hdr->lrh[3] == IB_LID_PERMISSIVE) && 500 smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 501 goto drop; 502 } 503 504 /* 505 * The opcode is in the low byte when its in network order 506 * (top byte when in host order). 507 */ 508 opcode = be32_to_cpu(ohdr->bth[0]) >> 24; 509 if (qp->ibqp.qp_num > 1 && 510 opcode == IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE) { 511 wc.ex.imm_data = ohdr->u.ud.imm_data; 512 wc.wc_flags = IB_WC_WITH_IMM; 513 } else if (opcode == IB_OPCODE_UD_SEND_ONLY) { 514 wc.ex.imm_data = 0; 515 wc.wc_flags = 0; 516 } else 517 goto drop; 518 519 /* 520 * A GRH is expected to precede the data even if not 521 * present on the wire. 522 */ 523 wc.byte_len = tlen + sizeof(struct ib_grh); 524 525 /* 526 * Get the next work request entry to find where to put the data. 527 */ 528 if (qp->r_flags & RVT_R_REUSE_SGE) 529 qp->r_flags &= ~RVT_R_REUSE_SGE; 530 else { 531 int ret; 532 533 ret = rvt_get_rwqe(qp, false); 534 if (ret < 0) { 535 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR); 536 return; 537 } 538 if (!ret) { 539 if (qp->ibqp.qp_num == 0) 540 ibp->rvp.n_vl15_dropped++; 541 return; 542 } 543 } 544 /* Silently drop packets which are too big. */ 545 if (unlikely(wc.byte_len > qp->r_len)) { 546 qp->r_flags |= RVT_R_REUSE_SGE; 547 goto drop; 548 } 549 if (has_grh) { 550 rvt_copy_sge(qp, &qp->r_sge, &hdr->u.l.grh, 551 sizeof(struct ib_grh), true, false); 552 wc.wc_flags |= IB_WC_GRH; 553 } else 554 rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true); 555 rvt_copy_sge(qp, &qp->r_sge, data, wc.byte_len - sizeof(struct ib_grh), 556 true, false); 557 rvt_put_ss(&qp->r_sge); 558 if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags)) 559 return; 560 wc.wr_id = qp->r_wr_id; 561 wc.status = IB_WC_SUCCESS; 562 wc.opcode = IB_WC_RECV; 563 wc.vendor_err = 0; 564 wc.qp = &qp->ibqp; 565 wc.src_qp = src_qp; 566 wc.pkey_index = qp->ibqp.qp_type == IB_QPT_GSI ? 567 qib_lookup_pkey(ibp, be32_to_cpu(ohdr->bth[0])) : 0; 568 wc.slid = be16_to_cpu(hdr->lrh[3]); 569 wc.sl = (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF; 570 dlid = be16_to_cpu(hdr->lrh[1]); 571 /* 572 * Save the LMC lower bits if the destination LID is a unicast LID. 573 */ 574 wc.dlid_path_bits = dlid >= be16_to_cpu(IB_MULTICAST_LID_BASE) ? 0 : 575 dlid & ((1 << ppd_from_ibp(ibp)->lmc) - 1); 576 wc.port_num = qp->port_num; 577 /* Signal completion event if the solicited bit is set. */ 578 rvt_recv_cq(qp, &wc, ib_bth_is_solicited(ohdr)); 579 return; 580 581 drop: 582 ibp->rvp.n_pkt_drops++; 583 } 584