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 36#include "qib.h" 37#include "qib_mad.h" 38 39/** 40 * qib_ud_loopback - handle send on loopback QPs 41 * @sqp: the sending QP 42 * @swqe: the send work request 43 * 44 * This is called from qib_make_ud_req() to forward a WQE addressed 45 * to the same HCA. 46 * Note that the receive interrupt handler may be calling qib_ud_rcv() 47 * while this is being called. 48 */ 49static void qib_ud_loopback(struct qib_qp *sqp, struct qib_swqe *swqe) 50{ 51 struct qib_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num); 52 struct qib_pportdata *ppd; 53 struct qib_qp *qp; 54 struct ib_ah_attr *ah_attr; 55 unsigned long flags; 56 struct qib_sge_state ssge; 57 struct qib_sge *sge; 58 struct ib_wc wc; 59 u32 length; 60 enum ib_qp_type sqptype, dqptype; 61 62 qp = qib_lookup_qpn(ibp, swqe->wr.wr.ud.remote_qpn); 63 if (!qp) { 64 ibp->n_pkt_drops++; 65 return; 66 } 67 68 sqptype = sqp->ibqp.qp_type == IB_QPT_GSI ? 69 IB_QPT_UD : sqp->ibqp.qp_type; 70 dqptype = qp->ibqp.qp_type == IB_QPT_GSI ? 71 IB_QPT_UD : qp->ibqp.qp_type; 72 73 if (dqptype != sqptype || 74 !(ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK)) { 75 ibp->n_pkt_drops++; 76 goto drop; 77 } 78 79 ah_attr = &to_iah(swqe->wr.wr.ud.ah)->attr; 80 ppd = ppd_from_ibp(ibp); 81 82 if (qp->ibqp.qp_num > 1) { 83 u16 pkey1; 84 u16 pkey2; 85 u16 lid; 86 87 pkey1 = qib_get_pkey(ibp, sqp->s_pkey_index); 88 pkey2 = qib_get_pkey(ibp, qp->s_pkey_index); 89 if (unlikely(!qib_pkey_ok(pkey1, pkey2))) { 90 lid = ppd->lid | (ah_attr->src_path_bits & 91 ((1 << ppd->lmc) - 1)); 92 qib_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_PKEY, pkey1, 93 ah_attr->sl, 94 sqp->ibqp.qp_num, qp->ibqp.qp_num, 95 cpu_to_be16(lid), 96 cpu_to_be16(ah_attr->dlid)); 97 goto drop; 98 } 99 } 100 101 /* 102 * Check that the qkey matches (except for QP0, see 9.6.1.4.1). 103 * Qkeys with the high order bit set mean use the 104 * qkey from the QP context instead of the WR (see 10.2.5). 105 */ 106 if (qp->ibqp.qp_num) { 107 u32 qkey; 108 109 qkey = (int)swqe->wr.wr.ud.remote_qkey < 0 ? 110 sqp->qkey : swqe->wr.wr.ud.remote_qkey; 111 if (unlikely(qkey != qp->qkey)) { 112 u16 lid; 113 114 lid = ppd->lid | (ah_attr->src_path_bits & 115 ((1 << ppd->lmc) - 1)); 116 qib_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_QKEY, qkey, 117 ah_attr->sl, 118 sqp->ibqp.qp_num, qp->ibqp.qp_num, 119 cpu_to_be16(lid), 120 cpu_to_be16(ah_attr->dlid)); 121 goto drop; 122 } 123 } 124 125 /* 126 * A GRH is expected to precede the data even if not 127 * present on the wire. 128 */ 129 length = swqe->length; 130 memset(&wc, 0, sizeof wc); 131 wc.byte_len = length + sizeof(struct ib_grh); 132 133 if (swqe->wr.opcode == IB_WR_SEND_WITH_IMM) { 134 wc.wc_flags = IB_WC_WITH_IMM; 135 wc.ex.imm_data = swqe->wr.ex.imm_data; 136 } 137 138 spin_lock_irqsave(&qp->r_lock, flags); 139 140 /* 141 * Get the next work request entry to find where to put the data. 142 */ 143 if (qp->r_flags & QIB_R_REUSE_SGE) 144 qp->r_flags &= ~QIB_R_REUSE_SGE; 145 else { 146 int ret; 147 148 ret = qib_get_rwqe(qp, 0); 149 if (ret < 0) { 150 qib_rc_error(qp, IB_WC_LOC_QP_OP_ERR); 151 goto bail_unlock; 152 } 153 if (!ret) { 154 if (qp->ibqp.qp_num == 0) 155 ibp->n_vl15_dropped++; 156 goto bail_unlock; 157 } 158 } 159 /* Silently drop packets which are too big. */ 160 if (unlikely(wc.byte_len > qp->r_len)) { 161 qp->r_flags |= QIB_R_REUSE_SGE; 162 ibp->n_pkt_drops++; 163 goto bail_unlock; 164 } 165 166 if (ah_attr->ah_flags & IB_AH_GRH) { 167 qib_copy_sge(&qp->r_sge, &ah_attr->grh, 168 sizeof(struct ib_grh), 1); 169 wc.wc_flags |= IB_WC_GRH; 170 } else 171 qib_skip_sge(&qp->r_sge, sizeof(struct ib_grh), 1); 172 ssge.sg_list = swqe->sg_list + 1; 173 ssge.sge = *swqe->sg_list; 174 ssge.num_sge = swqe->wr.num_sge; 175 sge = &ssge.sge; 176 while (length) { 177 u32 len = sge->length; 178 179 if (len > length) 180 len = length; 181 if (len > sge->sge_length) 182 len = sge->sge_length; 183 BUG_ON(len == 0); 184 qib_copy_sge(&qp->r_sge, sge->vaddr, len, 1); 185 sge->vaddr += len; 186 sge->length -= len; 187 sge->sge_length -= len; 188 if (sge->sge_length == 0) { 189 if (--ssge.num_sge) 190 *sge = *ssge.sg_list++; 191 } else if (sge->length == 0 && sge->mr->lkey) { 192 if (++sge->n >= QIB_SEGSZ) { 193 if (++sge->m >= sge->mr->mapsz) 194 break; 195 sge->n = 0; 196 } 197 sge->vaddr = 198 sge->mr->map[sge->m]->segs[sge->n].vaddr; 199 sge->length = 200 sge->mr->map[sge->m]->segs[sge->n].length; 201 } 202 length -= len; 203 } 204 qib_put_ss(&qp->r_sge); 205 if (!test_and_clear_bit(QIB_R_WRID_VALID, &qp->r_aflags)) 206 goto bail_unlock; 207 wc.wr_id = qp->r_wr_id; 208 wc.status = IB_WC_SUCCESS; 209 wc.opcode = IB_WC_RECV; 210 wc.qp = &qp->ibqp; 211 wc.src_qp = sqp->ibqp.qp_num; 212 wc.pkey_index = qp->ibqp.qp_type == IB_QPT_GSI ? 213 swqe->wr.wr.ud.pkey_index : 0; 214 wc.slid = ppd->lid | (ah_attr->src_path_bits & ((1 << ppd->lmc) - 1)); 215 wc.sl = ah_attr->sl; 216 wc.dlid_path_bits = ah_attr->dlid & ((1 << ppd->lmc) - 1); 217 wc.port_num = qp->port_num; 218 /* Signal completion event if the solicited bit is set. */ 219 qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 220 swqe->wr.send_flags & IB_SEND_SOLICITED); 221 ibp->n_loop_pkts++; 222bail_unlock: 223 spin_unlock_irqrestore(&qp->r_lock, flags); 224drop: 225 if (atomic_dec_and_test(&qp->refcount)) 226 wake_up(&qp->wait); 227} 228 229/** 230 * qib_make_ud_req - construct a UD request packet 231 * @qp: the QP 232 * 233 * Return 1 if constructed; otherwise, return 0. 234 */ 235int qib_make_ud_req(struct qib_qp *qp) 236{ 237 struct qib_other_headers *ohdr; 238 struct ib_ah_attr *ah_attr; 239 struct qib_pportdata *ppd; 240 struct qib_ibport *ibp; 241 struct qib_swqe *wqe; 242 unsigned long flags; 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 spin_lock_irqsave(&qp->s_lock, flags); 252 253 if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_NEXT_SEND_OK)) { 254 if (!(ib_qib_state_ops[qp->state] & QIB_FLUSH_SEND)) 255 goto bail; 256 /* We are in the error state, flush the work request. */ 257 if (qp->s_last == qp->s_head) 258 goto bail; 259 /* If DMAs are in progress, we can't flush immediately. */ 260 if (atomic_read(&qp->s_dma_busy)) { 261 qp->s_flags |= QIB_S_WAIT_DMA; 262 goto bail; 263 } 264 wqe = get_swqe_ptr(qp, qp->s_last); 265 qib_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR); 266 goto done; 267 } 268 269 if (qp->s_cur == qp->s_head) 270 goto bail; 271 272 wqe = get_swqe_ptr(qp, qp->s_cur); 273 next_cur = qp->s_cur + 1; 274 if (next_cur >= qp->s_size) 275 next_cur = 0; 276 277 /* Construct the header. */ 278 ibp = to_iport(qp->ibqp.device, qp->port_num); 279 ppd = ppd_from_ibp(ibp); 280 ah_attr = &to_iah(wqe->wr.wr.ud.ah)->attr; 281 if (ah_attr->dlid >= QIB_MULTICAST_LID_BASE) { 282 if (ah_attr->dlid != QIB_PERMISSIVE_LID) 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 = ah_attr->dlid & ~((1 << ppd->lmc) - 1); 289 if (unlikely(lid == ppd->lid)) { 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(&qp->s_dma_busy)) { 298 qp->s_flags |= QIB_S_WAIT_DMA; 299 goto bail; 300 } 301 qp->s_cur = next_cur; 302 spin_unlock_irqrestore(&qp->s_lock, flags); 303 qib_ud_loopback(qp, wqe); 304 spin_lock_irqsave(&qp->s_lock, flags); 305 qib_send_complete(qp, wqe, IB_WC_SUCCESS); 306 goto done; 307 } 308 } 309 310 qp->s_cur = next_cur; 311 extra_bytes = -wqe->length & 3; 312 nwords = (wqe->length + extra_bytes) >> 2; 313 314 /* header size in 32-bit words LRH+BTH+DETH = (8+12+8)/4. */ 315 qp->s_hdrwords = 7; 316 qp->s_cur_size = wqe->length; 317 qp->s_cur_sge = &qp->s_sge; 318 qp->s_srate = ah_attr->static_rate; 319 qp->s_wqe = wqe; 320 qp->s_sge.sge = wqe->sg_list[0]; 321 qp->s_sge.sg_list = wqe->sg_list + 1; 322 qp->s_sge.num_sge = wqe->wr.num_sge; 323 qp->s_sge.total_len = wqe->length; 324 325 if (ah_attr->ah_flags & IB_AH_GRH) { 326 /* Header size in 32-bit words. */ 327 qp->s_hdrwords += qib_make_grh(ibp, &qp->s_hdr->u.l.grh, 328 &ah_attr->grh, 329 qp->s_hdrwords, nwords); 330 lrh0 = QIB_LRH_GRH; 331 ohdr = &qp->s_hdr->u.l.oth; 332 /* 333 * Don't worry about sending to locally attached multicast 334 * QPs. It is unspecified by the spec. what happens. 335 */ 336 } else { 337 /* Header size in 32-bit words. */ 338 lrh0 = QIB_LRH_BTH; 339 ohdr = &qp->s_hdr->u.oth; 340 } 341 if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) { 342 qp->s_hdrwords++; 343 ohdr->u.ud.imm_data = wqe->wr.ex.imm_data; 344 bth0 = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE << 24; 345 } else 346 bth0 = IB_OPCODE_UD_SEND_ONLY << 24; 347 lrh0 |= ah_attr->sl << 4; 348 if (qp->ibqp.qp_type == IB_QPT_SMI) 349 lrh0 |= 0xF000; /* Set VL (see ch. 13.5.3.1) */ 350 else 351 lrh0 |= ibp->sl_to_vl[ah_attr->sl] << 12; 352 qp->s_hdr->lrh[0] = cpu_to_be16(lrh0); 353 qp->s_hdr->lrh[1] = cpu_to_be16(ah_attr->dlid); /* DEST LID */ 354 qp->s_hdr->lrh[2] = cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC); 355 lid = ppd->lid; 356 if (lid) { 357 lid |= ah_attr->src_path_bits & ((1 << ppd->lmc) - 1); 358 qp->s_hdr->lrh[3] = cpu_to_be16(lid); 359 } else 360 qp->s_hdr->lrh[3] = IB_LID_PERMISSIVE; 361 if (wqe->wr.send_flags & IB_SEND_SOLICITED) 362 bth0 |= IB_BTH_SOLICITED; 363 bth0 |= extra_bytes << 20; 364 bth0 |= qp->ibqp.qp_type == IB_QPT_SMI ? QIB_DEFAULT_P_KEY : 365 qib_get_pkey(ibp, qp->ibqp.qp_type == IB_QPT_GSI ? 366 wqe->wr.wr.ud.pkey_index : qp->s_pkey_index); 367 ohdr->bth[0] = cpu_to_be32(bth0); 368 /* 369 * Use the multicast QP if the destination LID is a multicast LID. 370 */ 371 ohdr->bth[1] = ah_attr->dlid >= QIB_MULTICAST_LID_BASE && 372 ah_attr->dlid != QIB_PERMISSIVE_LID ? 373 cpu_to_be32(QIB_MULTICAST_QPN) : 374 cpu_to_be32(wqe->wr.wr.ud.remote_qpn); 375 ohdr->bth[2] = cpu_to_be32(qp->s_next_psn++ & QIB_PSN_MASK); 376 /* 377 * Qkeys with the high order bit set mean use the 378 * qkey from the QP context instead of the WR (see 10.2.5). 379 */ 380 ohdr->u.ud.deth[0] = cpu_to_be32((int)wqe->wr.wr.ud.remote_qkey < 0 ? 381 qp->qkey : wqe->wr.wr.ud.remote_qkey); 382 ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num); 383 384done: 385 ret = 1; 386 goto unlock; 387 388bail: 389 qp->s_flags &= ~QIB_S_BUSY; 390unlock: 391 spin_unlock_irqrestore(&qp->s_lock, flags); 392 return ret; 393} 394 395static unsigned qib_lookup_pkey(struct qib_ibport *ibp, u16 pkey) 396{ 397 struct qib_pportdata *ppd = ppd_from_ibp(ibp); 398 struct qib_devdata *dd = ppd->dd; 399 unsigned ctxt = ppd->hw_pidx; 400 unsigned i; 401 402 pkey &= 0x7fff; /* remove limited/full membership bit */ 403 404 for (i = 0; i < ARRAY_SIZE(dd->rcd[ctxt]->pkeys); ++i) 405 if ((dd->rcd[ctxt]->pkeys[i] & 0x7fff) == pkey) 406 return i; 407 408 /* 409 * Should not get here, this means hardware failed to validate pkeys. 410 * Punt and return index 0. 411 */ 412 return 0; 413} 414 415/** 416 * qib_ud_rcv - receive an incoming UD packet 417 * @ibp: the port the packet came in on 418 * @hdr: the packet header 419 * @has_grh: true if the packet has a GRH 420 * @data: the packet data 421 * @tlen: the packet length 422 * @qp: the QP the packet came on 423 * 424 * This is called from qib_qp_rcv() to process an incoming UD packet 425 * for the given QP. 426 * Called at interrupt level. 427 */ 428void qib_ud_rcv(struct qib_ibport *ibp, struct qib_ib_header *hdr, 429 int has_grh, void *data, u32 tlen, struct qib_qp *qp) 430{ 431 struct qib_other_headers *ohdr; 432 int opcode; 433 u32 hdrsize; 434 u32 pad; 435 struct ib_wc wc; 436 u32 qkey; 437 u32 src_qp; 438 u16 dlid; 439 440 /* Check for GRH */ 441 if (!has_grh) { 442 ohdr = &hdr->u.oth; 443 hdrsize = 8 + 12 + 8; /* LRH + BTH + DETH */ 444 } else { 445 ohdr = &hdr->u.l.oth; 446 hdrsize = 8 + 40 + 12 + 8; /* LRH + GRH + BTH + DETH */ 447 } 448 qkey = be32_to_cpu(ohdr->u.ud.deth[0]); 449 src_qp = be32_to_cpu(ohdr->u.ud.deth[1]) & QIB_QPN_MASK; 450 451 /* 452 * Get the number of bytes the message was padded by 453 * and drop incomplete packets. 454 */ 455 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; 456 if (unlikely(tlen < (hdrsize + pad + 4))) 457 goto drop; 458 459 tlen -= hdrsize + pad + 4; 460 461 /* 462 * Check that the permissive LID is only used on QP0 463 * and the QKEY matches (see 9.6.1.4.1 and 9.6.1.5.1). 464 */ 465 if (qp->ibqp.qp_num) { 466 if (unlikely(hdr->lrh[1] == IB_LID_PERMISSIVE || 467 hdr->lrh[3] == IB_LID_PERMISSIVE)) 468 goto drop; 469 if (qp->ibqp.qp_num > 1) { 470 u16 pkey1, pkey2; 471 472 pkey1 = be32_to_cpu(ohdr->bth[0]); 473 pkey2 = qib_get_pkey(ibp, qp->s_pkey_index); 474 if (unlikely(!qib_pkey_ok(pkey1, pkey2))) { 475 qib_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_PKEY, 476 pkey1, 477 (be16_to_cpu(hdr->lrh[0]) >> 4) & 478 0xF, 479 src_qp, qp->ibqp.qp_num, 480 hdr->lrh[3], hdr->lrh[1]); 481 return; 482 } 483 } 484 if (unlikely(qkey != qp->qkey)) { 485 qib_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_QKEY, qkey, 486 (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF, 487 src_qp, qp->ibqp.qp_num, 488 hdr->lrh[3], hdr->lrh[1]); 489 return; 490 } 491 /* Drop invalid MAD packets (see 13.5.3.1). */ 492 if (unlikely(qp->ibqp.qp_num == 1 && 493 (tlen != 256 || 494 (be16_to_cpu(hdr->lrh[0]) >> 12) == 15))) 495 goto drop; 496 } else { 497 struct ib_smp *smp; 498 499 /* Drop invalid MAD packets (see 13.5.3.1). */ 500 if (tlen != 256 || (be16_to_cpu(hdr->lrh[0]) >> 12) != 15) 501 goto drop; 502 smp = (struct ib_smp *) data; 503 if ((hdr->lrh[1] == IB_LID_PERMISSIVE || 504 hdr->lrh[3] == IB_LID_PERMISSIVE) && 505 smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 506 goto drop; 507 } 508 509 /* 510 * The opcode is in the low byte when its in network order 511 * (top byte when in host order). 512 */ 513 opcode = be32_to_cpu(ohdr->bth[0]) >> 24; 514 if (qp->ibqp.qp_num > 1 && 515 opcode == IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE) { 516 wc.ex.imm_data = ohdr->u.ud.imm_data; 517 wc.wc_flags = IB_WC_WITH_IMM; 518 tlen -= sizeof(u32); 519 } else if (opcode == IB_OPCODE_UD_SEND_ONLY) { 520 wc.ex.imm_data = 0; 521 wc.wc_flags = 0; 522 } else 523 goto drop; 524 525 /* 526 * A GRH is expected to precede the data even if not 527 * present on the wire. 528 */ 529 wc.byte_len = tlen + sizeof(struct ib_grh); 530 531 /* 532 * Get the next work request entry to find where to put the data. 533 */ 534 if (qp->r_flags & QIB_R_REUSE_SGE) 535 qp->r_flags &= ~QIB_R_REUSE_SGE; 536 else { 537 int ret; 538 539 ret = qib_get_rwqe(qp, 0); 540 if (ret < 0) { 541 qib_rc_error(qp, IB_WC_LOC_QP_OP_ERR); 542 return; 543 } 544 if (!ret) { 545 if (qp->ibqp.qp_num == 0) 546 ibp->n_vl15_dropped++; 547 return; 548 } 549 } 550 /* Silently drop packets which are too big. */ 551 if (unlikely(wc.byte_len > qp->r_len)) { 552 qp->r_flags |= QIB_R_REUSE_SGE; 553 goto drop; 554 } 555 if (has_grh) { 556 qib_copy_sge(&qp->r_sge, &hdr->u.l.grh, 557 sizeof(struct ib_grh), 1); 558 wc.wc_flags |= IB_WC_GRH; 559 } else 560 qib_skip_sge(&qp->r_sge, sizeof(struct ib_grh), 1); 561 qib_copy_sge(&qp->r_sge, data, wc.byte_len - sizeof(struct ib_grh), 1); 562 qib_put_ss(&qp->r_sge); 563 if (!test_and_clear_bit(QIB_R_WRID_VALID, &qp->r_aflags)) 564 return; 565 wc.wr_id = qp->r_wr_id; 566 wc.status = IB_WC_SUCCESS; 567 wc.opcode = IB_WC_RECV; 568 wc.vendor_err = 0; 569 wc.qp = &qp->ibqp; 570 wc.src_qp = src_qp; 571 wc.pkey_index = qp->ibqp.qp_type == IB_QPT_GSI ? 572 qib_lookup_pkey(ibp, be32_to_cpu(ohdr->bth[0])) : 0; 573 wc.slid = be16_to_cpu(hdr->lrh[3]); 574 wc.sl = (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF; 575 dlid = be16_to_cpu(hdr->lrh[1]); 576 /* 577 * Save the LMC lower bits if the destination LID is a unicast LID. 578 */ 579 wc.dlid_path_bits = dlid >= QIB_MULTICAST_LID_BASE ? 0 : 580 dlid & ((1 << ppd_from_ibp(ibp)->lmc) - 1); 581 wc.port_num = qp->port_num; 582 /* Signal completion event if the solicited bit is set. */ 583 qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 584 (ohdr->bth[0] & 585 cpu_to_be32(IB_BTH_SOLICITED)) != 0); 586 return; 587 588drop: 589 ibp->n_pkt_drops++; 590} 591