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