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 rcu_read_unlock(); 70 return; 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 = &ibah_to_rvtah(swqe->ud_wr.ah)->attr; 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_pqkey(ibp, IB_NOTICE_TRAP_BAD_PKEY, 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)swqe->ud_wr.remote_qkey < 0 ? 115 sqp->qkey : swqe->ud_wr.remote_qkey; 116 if (unlikely(qkey != qp->qkey)) { 117 u16 lid; 118 119 lid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) & 120 ((1 << ppd->lmc) - 1)); 121 qib_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_QKEY, qkey, 122 rdma_ah_get_sl(ah_attr), 123 sqp->ibqp.qp_num, qp->ibqp.qp_num, 124 cpu_to_be16(lid), 125 cpu_to_be16(rdma_ah_get_dlid(ah_attr))); 126 goto drop; 127 } 128 } 129 130 /* 131 * A GRH is expected to precede the data even if not 132 * present on the wire. 133 */ 134 length = swqe->length; 135 memset(&wc, 0, sizeof(wc)); 136 wc.byte_len = length + sizeof(struct ib_grh); 137 138 if (swqe->wr.opcode == IB_WR_SEND_WITH_IMM) { 139 wc.wc_flags = IB_WC_WITH_IMM; 140 wc.ex.imm_data = swqe->wr.ex.imm_data; 141 } 142 143 spin_lock_irqsave(&qp->r_lock, flags); 144 145 /* 146 * Get the next work request entry to find where to put the data. 147 */ 148 if (qp->r_flags & RVT_R_REUSE_SGE) 149 qp->r_flags &= ~RVT_R_REUSE_SGE; 150 else { 151 int ret; 152 153 ret = qib_get_rwqe(qp, 0); 154 if (ret < 0) { 155 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR); 156 goto bail_unlock; 157 } 158 if (!ret) { 159 if (qp->ibqp.qp_num == 0) 160 ibp->rvp.n_vl15_dropped++; 161 goto bail_unlock; 162 } 163 } 164 /* Silently drop packets which are too big. */ 165 if (unlikely(wc.byte_len > qp->r_len)) { 166 qp->r_flags |= RVT_R_REUSE_SGE; 167 ibp->rvp.n_pkt_drops++; 168 goto bail_unlock; 169 } 170 171 if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) { 172 struct ib_grh grh; 173 const struct ib_global_route *grd = rdma_ah_read_grh(ah_attr); 174 175 qib_make_grh(ibp, &grh, grd, 0, 0); 176 qib_copy_sge(&qp->r_sge, &grh, 177 sizeof(grh), 1); 178 wc.wc_flags |= IB_WC_GRH; 179 } else 180 rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true); 181 ssge.sg_list = swqe->sg_list + 1; 182 ssge.sge = *swqe->sg_list; 183 ssge.num_sge = swqe->wr.num_sge; 184 sge = &ssge.sge; 185 while (length) { 186 u32 len = sge->length; 187 188 if (len > length) 189 len = length; 190 if (len > sge->sge_length) 191 len = sge->sge_length; 192 BUG_ON(len == 0); 193 qib_copy_sge(&qp->r_sge, sge->vaddr, len, 1); 194 sge->vaddr += len; 195 sge->length -= len; 196 sge->sge_length -= len; 197 if (sge->sge_length == 0) { 198 if (--ssge.num_sge) 199 *sge = *ssge.sg_list++; 200 } else if (sge->length == 0 && sge->mr->lkey) { 201 if (++sge->n >= RVT_SEGSZ) { 202 if (++sge->m >= sge->mr->mapsz) 203 break; 204 sge->n = 0; 205 } 206 sge->vaddr = 207 sge->mr->map[sge->m]->segs[sge->n].vaddr; 208 sge->length = 209 sge->mr->map[sge->m]->segs[sge->n].length; 210 } 211 length -= len; 212 } 213 rvt_put_ss(&qp->r_sge); 214 if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags)) 215 goto bail_unlock; 216 wc.wr_id = qp->r_wr_id; 217 wc.status = IB_WC_SUCCESS; 218 wc.opcode = IB_WC_RECV; 219 wc.qp = &qp->ibqp; 220 wc.src_qp = sqp->ibqp.qp_num; 221 wc.pkey_index = qp->ibqp.qp_type == IB_QPT_GSI ? 222 swqe->ud_wr.pkey_index : 0; 223 wc.slid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) & 224 ((1 << ppd->lmc) - 1)); 225 wc.sl = rdma_ah_get_sl(ah_attr); 226 wc.dlid_path_bits = rdma_ah_get_dlid(ah_attr) & ((1 << ppd->lmc) - 1); 227 wc.port_num = qp->port_num; 228 /* Signal completion event if the solicited bit is set. */ 229 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc, 230 swqe->wr.send_flags & IB_SEND_SOLICITED); 231 ibp->rvp.n_loop_pkts++; 232 bail_unlock: 233 spin_unlock_irqrestore(&qp->r_lock, flags); 234 drop: 235 rcu_read_unlock(); 236 } 237 238 /** 239 * qib_make_ud_req - construct a UD request packet 240 * @qp: the QP 241 * 242 * Assumes the s_lock is held. 243 * 244 * Return 1 if constructed; otherwise, return 0. 245 */ 246 int qib_make_ud_req(struct rvt_qp *qp, unsigned long *flags) 247 { 248 struct qib_qp_priv *priv = qp->priv; 249 struct ib_other_headers *ohdr; 250 struct rdma_ah_attr *ah_attr; 251 struct qib_pportdata *ppd; 252 struct qib_ibport *ibp; 253 struct rvt_swqe *wqe; 254 u32 nwords; 255 u32 extra_bytes; 256 u32 bth0; 257 u16 lrh0; 258 u16 lid; 259 int ret = 0; 260 int next_cur; 261 262 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_NEXT_SEND_OK)) { 263 if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND)) 264 goto bail; 265 /* We are in the error state, flush the work request. */ 266 smp_read_barrier_depends(); /* see post_one_send */ 267 if (qp->s_last == ACCESS_ONCE(qp->s_head)) 268 goto bail; 269 /* If DMAs are in progress, we can't flush immediately. */ 270 if (atomic_read(&priv->s_dma_busy)) { 271 qp->s_flags |= RVT_S_WAIT_DMA; 272 goto bail; 273 } 274 wqe = rvt_get_swqe_ptr(qp, qp->s_last); 275 qib_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR); 276 goto done; 277 } 278 279 /* see post_one_send() */ 280 smp_read_barrier_depends(); 281 if (qp->s_cur == ACCESS_ONCE(qp->s_head)) 282 goto bail; 283 284 wqe = rvt_get_swqe_ptr(qp, qp->s_cur); 285 next_cur = qp->s_cur + 1; 286 if (next_cur >= qp->s_size) 287 next_cur = 0; 288 289 /* Construct the header. */ 290 ibp = to_iport(qp->ibqp.device, qp->port_num); 291 ppd = ppd_from_ibp(ibp); 292 ah_attr = &ibah_to_rvtah(wqe->ud_wr.ah)->attr; 293 if (rdma_ah_get_dlid(ah_attr) >= be16_to_cpu(IB_MULTICAST_LID_BASE)) { 294 if (rdma_ah_get_dlid(ah_attr) != 295 be16_to_cpu(IB_LID_PERMISSIVE)) 296 this_cpu_inc(ibp->pmastats->n_multicast_xmit); 297 else 298 this_cpu_inc(ibp->pmastats->n_unicast_xmit); 299 } else { 300 this_cpu_inc(ibp->pmastats->n_unicast_xmit); 301 lid = rdma_ah_get_dlid(ah_attr) & ~((1 << ppd->lmc) - 1); 302 if (unlikely(lid == ppd->lid)) { 303 unsigned long tflags = *flags; 304 /* 305 * If DMAs are in progress, we can't generate 306 * a completion for the loopback packet since 307 * it would be out of order. 308 * XXX Instead of waiting, we could queue a 309 * zero length descriptor so we get a callback. 310 */ 311 if (atomic_read(&priv->s_dma_busy)) { 312 qp->s_flags |= RVT_S_WAIT_DMA; 313 goto bail; 314 } 315 qp->s_cur = next_cur; 316 spin_unlock_irqrestore(&qp->s_lock, tflags); 317 qib_ud_loopback(qp, wqe); 318 spin_lock_irqsave(&qp->s_lock, tflags); 319 *flags = tflags; 320 qib_send_complete(qp, wqe, IB_WC_SUCCESS); 321 goto done; 322 } 323 } 324 325 qp->s_cur = next_cur; 326 extra_bytes = -wqe->length & 3; 327 nwords = (wqe->length + extra_bytes) >> 2; 328 329 /* header size in 32-bit words LRH+BTH+DETH = (8+12+8)/4. */ 330 qp->s_hdrwords = 7; 331 qp->s_cur_size = wqe->length; 332 qp->s_cur_sge = &qp->s_sge; 333 qp->s_srate = rdma_ah_get_static_rate(ah_attr); 334 qp->s_wqe = wqe; 335 qp->s_sge.sge = wqe->sg_list[0]; 336 qp->s_sge.sg_list = wqe->sg_list + 1; 337 qp->s_sge.num_sge = wqe->wr.num_sge; 338 qp->s_sge.total_len = wqe->length; 339 340 if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) { 341 /* Header size in 32-bit words. */ 342 qp->s_hdrwords += qib_make_grh(ibp, &priv->s_hdr->u.l.grh, 343 rdma_ah_read_grh(ah_attr), 344 qp->s_hdrwords, nwords); 345 lrh0 = QIB_LRH_GRH; 346 ohdr = &priv->s_hdr->u.l.oth; 347 /* 348 * Don't worry about sending to locally attached multicast 349 * QPs. It is unspecified by the spec. what happens. 350 */ 351 } else { 352 /* Header size in 32-bit words. */ 353 lrh0 = QIB_LRH_BTH; 354 ohdr = &priv->s_hdr->u.oth; 355 } 356 if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) { 357 qp->s_hdrwords++; 358 ohdr->u.ud.imm_data = wqe->wr.ex.imm_data; 359 bth0 = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE << 24; 360 } else 361 bth0 = IB_OPCODE_UD_SEND_ONLY << 24; 362 lrh0 |= rdma_ah_get_sl(ah_attr) << 4; 363 if (qp->ibqp.qp_type == IB_QPT_SMI) 364 lrh0 |= 0xF000; /* Set VL (see ch. 13.5.3.1) */ 365 else 366 lrh0 |= ibp->sl_to_vl[rdma_ah_get_sl(ah_attr)] << 12; 367 priv->s_hdr->lrh[0] = cpu_to_be16(lrh0); 368 priv->s_hdr->lrh[1] = 369 cpu_to_be16(rdma_ah_get_dlid(ah_attr)); /* DEST LID */ 370 priv->s_hdr->lrh[2] = 371 cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC); 372 lid = ppd->lid; 373 if (lid) { 374 lid |= rdma_ah_get_path_bits(ah_attr) & 375 ((1 << ppd->lmc) - 1); 376 priv->s_hdr->lrh[3] = cpu_to_be16(lid); 377 } else 378 priv->s_hdr->lrh[3] = IB_LID_PERMISSIVE; 379 if (wqe->wr.send_flags & IB_SEND_SOLICITED) 380 bth0 |= IB_BTH_SOLICITED; 381 bth0 |= extra_bytes << 20; 382 bth0 |= qp->ibqp.qp_type == IB_QPT_SMI ? QIB_DEFAULT_P_KEY : 383 qib_get_pkey(ibp, qp->ibqp.qp_type == IB_QPT_GSI ? 384 wqe->ud_wr.pkey_index : qp->s_pkey_index); 385 ohdr->bth[0] = cpu_to_be32(bth0); 386 /* 387 * Use the multicast QP if the destination LID is a multicast LID. 388 */ 389 ohdr->bth[1] = rdma_ah_get_dlid(ah_attr) >= 390 be16_to_cpu(IB_MULTICAST_LID_BASE) && 391 rdma_ah_get_dlid(ah_attr) != be16_to_cpu(IB_LID_PERMISSIVE) ? 392 cpu_to_be32(QIB_MULTICAST_QPN) : 393 cpu_to_be32(wqe->ud_wr.remote_qpn); 394 ohdr->bth[2] = cpu_to_be32(wqe->psn & QIB_PSN_MASK); 395 /* 396 * Qkeys with the high order bit set mean use the 397 * qkey from the QP context instead of the WR (see 10.2.5). 398 */ 399 ohdr->u.ud.deth[0] = cpu_to_be32((int)wqe->ud_wr.remote_qkey < 0 ? 400 qp->qkey : wqe->ud_wr.remote_qkey); 401 ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num); 402 403 done: 404 return 1; 405 bail: 406 qp->s_flags &= ~RVT_S_BUSY; 407 return ret; 408 } 409 410 static unsigned qib_lookup_pkey(struct qib_ibport *ibp, u16 pkey) 411 { 412 struct qib_pportdata *ppd = ppd_from_ibp(ibp); 413 struct qib_devdata *dd = ppd->dd; 414 unsigned ctxt = ppd->hw_pidx; 415 unsigned i; 416 417 pkey &= 0x7fff; /* remove limited/full membership bit */ 418 419 for (i = 0; i < ARRAY_SIZE(dd->rcd[ctxt]->pkeys); ++i) 420 if ((dd->rcd[ctxt]->pkeys[i] & 0x7fff) == pkey) 421 return i; 422 423 /* 424 * Should not get here, this means hardware failed to validate pkeys. 425 * Punt and return index 0. 426 */ 427 return 0; 428 } 429 430 /** 431 * qib_ud_rcv - receive an incoming UD packet 432 * @ibp: the port the packet came in on 433 * @hdr: the packet header 434 * @has_grh: true if the packet has a GRH 435 * @data: the packet data 436 * @tlen: the packet length 437 * @qp: the QP the packet came on 438 * 439 * This is called from qib_qp_rcv() to process an incoming UD packet 440 * for the given QP. 441 * Called at interrupt level. 442 */ 443 void qib_ud_rcv(struct qib_ibport *ibp, struct ib_header *hdr, 444 int has_grh, void *data, u32 tlen, struct rvt_qp *qp) 445 { 446 struct ib_other_headers *ohdr; 447 int opcode; 448 u32 hdrsize; 449 u32 pad; 450 struct ib_wc wc; 451 u32 qkey; 452 u32 src_qp; 453 u16 dlid; 454 455 /* Check for GRH */ 456 if (!has_grh) { 457 ohdr = &hdr->u.oth; 458 hdrsize = 8 + 12 + 8; /* LRH + BTH + DETH */ 459 } else { 460 ohdr = &hdr->u.l.oth; 461 hdrsize = 8 + 40 + 12 + 8; /* LRH + GRH + BTH + DETH */ 462 } 463 qkey = be32_to_cpu(ohdr->u.ud.deth[0]); 464 src_qp = be32_to_cpu(ohdr->u.ud.deth[1]) & RVT_QPN_MASK; 465 466 /* 467 * Get the number of bytes the message was padded by 468 * and drop incomplete packets. 469 */ 470 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; 471 if (unlikely(tlen < (hdrsize + pad + 4))) 472 goto drop; 473 474 tlen -= hdrsize + pad + 4; 475 476 /* 477 * Check that the permissive LID is only used on QP0 478 * and the QKEY matches (see 9.6.1.4.1 and 9.6.1.5.1). 479 */ 480 if (qp->ibqp.qp_num) { 481 if (unlikely(hdr->lrh[1] == IB_LID_PERMISSIVE || 482 hdr->lrh[3] == IB_LID_PERMISSIVE)) 483 goto drop; 484 if (qp->ibqp.qp_num > 1) { 485 u16 pkey1, pkey2; 486 487 pkey1 = be32_to_cpu(ohdr->bth[0]); 488 pkey2 = qib_get_pkey(ibp, qp->s_pkey_index); 489 if (unlikely(!qib_pkey_ok(pkey1, pkey2))) { 490 qib_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_PKEY, 491 pkey1, 492 (be16_to_cpu(hdr->lrh[0]) >> 4) & 493 0xF, 494 src_qp, qp->ibqp.qp_num, 495 hdr->lrh[3], hdr->lrh[1]); 496 return; 497 } 498 } 499 if (unlikely(qkey != qp->qkey)) { 500 qib_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_QKEY, qkey, 501 (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF, 502 src_qp, qp->ibqp.qp_num, 503 hdr->lrh[3], hdr->lrh[1]); 504 return; 505 } 506 /* Drop invalid MAD packets (see 13.5.3.1). */ 507 if (unlikely(qp->ibqp.qp_num == 1 && 508 (tlen != 256 || 509 (be16_to_cpu(hdr->lrh[0]) >> 12) == 15))) 510 goto drop; 511 } else { 512 struct ib_smp *smp; 513 514 /* Drop invalid MAD packets (see 13.5.3.1). */ 515 if (tlen != 256 || (be16_to_cpu(hdr->lrh[0]) >> 12) != 15) 516 goto drop; 517 smp = (struct ib_smp *) data; 518 if ((hdr->lrh[1] == IB_LID_PERMISSIVE || 519 hdr->lrh[3] == IB_LID_PERMISSIVE) && 520 smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) 521 goto drop; 522 } 523 524 /* 525 * The opcode is in the low byte when its in network order 526 * (top byte when in host order). 527 */ 528 opcode = be32_to_cpu(ohdr->bth[0]) >> 24; 529 if (qp->ibqp.qp_num > 1 && 530 opcode == IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE) { 531 wc.ex.imm_data = ohdr->u.ud.imm_data; 532 wc.wc_flags = IB_WC_WITH_IMM; 533 tlen -= sizeof(u32); 534 } else if (opcode == IB_OPCODE_UD_SEND_ONLY) { 535 wc.ex.imm_data = 0; 536 wc.wc_flags = 0; 537 } else 538 goto drop; 539 540 /* 541 * A GRH is expected to precede the data even if not 542 * present on the wire. 543 */ 544 wc.byte_len = tlen + sizeof(struct ib_grh); 545 546 /* 547 * Get the next work request entry to find where to put the data. 548 */ 549 if (qp->r_flags & RVT_R_REUSE_SGE) 550 qp->r_flags &= ~RVT_R_REUSE_SGE; 551 else { 552 int ret; 553 554 ret = qib_get_rwqe(qp, 0); 555 if (ret < 0) { 556 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR); 557 return; 558 } 559 if (!ret) { 560 if (qp->ibqp.qp_num == 0) 561 ibp->rvp.n_vl15_dropped++; 562 return; 563 } 564 } 565 /* Silently drop packets which are too big. */ 566 if (unlikely(wc.byte_len > qp->r_len)) { 567 qp->r_flags |= RVT_R_REUSE_SGE; 568 goto drop; 569 } 570 if (has_grh) { 571 qib_copy_sge(&qp->r_sge, &hdr->u.l.grh, 572 sizeof(struct ib_grh), 1); 573 wc.wc_flags |= IB_WC_GRH; 574 } else 575 rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true); 576 qib_copy_sge(&qp->r_sge, data, wc.byte_len - sizeof(struct ib_grh), 1); 577 rvt_put_ss(&qp->r_sge); 578 if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags)) 579 return; 580 wc.wr_id = qp->r_wr_id; 581 wc.status = IB_WC_SUCCESS; 582 wc.opcode = IB_WC_RECV; 583 wc.vendor_err = 0; 584 wc.qp = &qp->ibqp; 585 wc.src_qp = src_qp; 586 wc.pkey_index = qp->ibqp.qp_type == IB_QPT_GSI ? 587 qib_lookup_pkey(ibp, be32_to_cpu(ohdr->bth[0])) : 0; 588 wc.slid = be16_to_cpu(hdr->lrh[3]); 589 wc.sl = (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF; 590 dlid = be16_to_cpu(hdr->lrh[1]); 591 /* 592 * Save the LMC lower bits if the destination LID is a unicast LID. 593 */ 594 wc.dlid_path_bits = dlid >= be16_to_cpu(IB_MULTICAST_LID_BASE) ? 0 : 595 dlid & ((1 << ppd_from_ibp(ibp)->lmc) - 1); 596 wc.port_num = qp->port_num; 597 /* Signal completion event if the solicited bit is set. */ 598 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc, 599 (ohdr->bth[0] & 600 cpu_to_be32(IB_BTH_SOLICITED)) != 0); 601 return; 602 603 drop: 604 ibp->rvp.n_pkt_drops++; 605 } 606