1 /* 2 * Copyright(c) 2015, 2016 Intel Corporation. 3 * 4 * This file is provided under a dual BSD/GPLv2 license. When using or 5 * redistributing this file, you may do so under either license. 6 * 7 * GPL LICENSE SUMMARY 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of version 2 of the GNU General Public License as 11 * published by the Free Software Foundation. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 * BSD LICENSE 19 * 20 * Redistribution and use in source and binary forms, with or without 21 * modification, are permitted provided that the following conditions 22 * are met: 23 * 24 * - Redistributions of source code must retain the above copyright 25 * notice, this list of conditions and the following disclaimer. 26 * - Redistributions in binary form must reproduce the above copyright 27 * notice, this list of conditions and the following disclaimer in 28 * the documentation and/or other materials provided with the 29 * distribution. 30 * - Neither the name of Intel Corporation nor the names of its 31 * contributors may be used to endorse or promote products derived 32 * from this software without specific prior written permission. 33 * 34 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 35 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 36 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 37 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 38 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 39 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 40 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 41 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 42 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 43 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 44 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 45 * 46 */ 47 48 #include "hfi.h" 49 #include "verbs_txreq.h" 50 #include "qp.h" 51 52 /* cut down ridiculously long IB macro names */ 53 #define OP(x) UC_OP(x) 54 55 /** 56 * hfi1_make_uc_req - construct a request packet (SEND, RDMA write) 57 * @qp: a pointer to the QP 58 * 59 * Assume s_lock is held. 60 * 61 * Return 1 if constructed; otherwise, return 0. 62 */ 63 int hfi1_make_uc_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps) 64 { 65 struct hfi1_qp_priv *priv = qp->priv; 66 struct ib_other_headers *ohdr; 67 struct rvt_swqe *wqe; 68 u32 hwords; 69 u32 bth0 = 0; 70 u32 len; 71 u32 pmtu = qp->pmtu; 72 int middle = 0; 73 74 ps->s_txreq = get_txreq(ps->dev, qp); 75 if (IS_ERR(ps->s_txreq)) 76 goto bail_no_tx; 77 78 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_SEND_OK)) { 79 if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND)) 80 goto bail; 81 /* We are in the error state, flush the work request. */ 82 smp_read_barrier_depends(); /* see post_one_send() */ 83 if (qp->s_last == READ_ONCE(qp->s_head)) 84 goto bail; 85 /* If DMAs are in progress, we can't flush immediately. */ 86 if (iowait_sdma_pending(&priv->s_iowait)) { 87 qp->s_flags |= RVT_S_WAIT_DMA; 88 goto bail; 89 } 90 clear_ahg(qp); 91 wqe = rvt_get_swqe_ptr(qp, qp->s_last); 92 hfi1_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR); 93 goto done_free_tx; 94 } 95 96 if (priv->hdr_type == HFI1_PKT_TYPE_9B) { 97 /* header size in 32-bit words LRH+BTH = (8+12)/4. */ 98 hwords = 5; 99 if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) 100 ohdr = &ps->s_txreq->phdr.hdr.ibh.u.l.oth; 101 else 102 ohdr = &ps->s_txreq->phdr.hdr.ibh.u.oth; 103 } else { 104 /* header size in 32-bit words 16B LRH+BTH = (16+12)/4. */ 105 hwords = 7; 106 if ((rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) && 107 (hfi1_check_mcast(rdma_ah_get_dlid(&qp->remote_ah_attr)))) 108 ohdr = &ps->s_txreq->phdr.hdr.opah.u.l.oth; 109 else 110 ohdr = &ps->s_txreq->phdr.hdr.opah.u.oth; 111 } 112 113 /* Get the next send request. */ 114 wqe = rvt_get_swqe_ptr(qp, qp->s_cur); 115 qp->s_wqe = NULL; 116 switch (qp->s_state) { 117 default: 118 if (!(ib_rvt_state_ops[qp->state] & 119 RVT_PROCESS_NEXT_SEND_OK)) 120 goto bail; 121 /* Check if send work queue is empty. */ 122 smp_read_barrier_depends(); /* see post_one_send() */ 123 if (qp->s_cur == READ_ONCE(qp->s_head)) { 124 clear_ahg(qp); 125 goto bail; 126 } 127 /* 128 * Local operations are processed immediately 129 * after all prior requests have completed. 130 */ 131 if (wqe->wr.opcode == IB_WR_REG_MR || 132 wqe->wr.opcode == IB_WR_LOCAL_INV) { 133 int local_ops = 0; 134 int err = 0; 135 136 if (qp->s_last != qp->s_cur) 137 goto bail; 138 if (++qp->s_cur == qp->s_size) 139 qp->s_cur = 0; 140 if (!(wqe->wr.send_flags & RVT_SEND_COMPLETION_ONLY)) { 141 err = rvt_invalidate_rkey( 142 qp, wqe->wr.ex.invalidate_rkey); 143 local_ops = 1; 144 } 145 hfi1_send_complete(qp, wqe, err ? IB_WC_LOC_PROT_ERR 146 : IB_WC_SUCCESS); 147 if (local_ops) 148 atomic_dec(&qp->local_ops_pending); 149 qp->s_hdrwords = 0; 150 goto done_free_tx; 151 } 152 /* 153 * Start a new request. 154 */ 155 qp->s_psn = wqe->psn; 156 qp->s_sge.sge = wqe->sg_list[0]; 157 qp->s_sge.sg_list = wqe->sg_list + 1; 158 qp->s_sge.num_sge = wqe->wr.num_sge; 159 qp->s_sge.total_len = wqe->length; 160 len = wqe->length; 161 qp->s_len = len; 162 switch (wqe->wr.opcode) { 163 case IB_WR_SEND: 164 case IB_WR_SEND_WITH_IMM: 165 if (len > pmtu) { 166 qp->s_state = OP(SEND_FIRST); 167 len = pmtu; 168 break; 169 } 170 if (wqe->wr.opcode == IB_WR_SEND) { 171 qp->s_state = OP(SEND_ONLY); 172 } else { 173 qp->s_state = 174 OP(SEND_ONLY_WITH_IMMEDIATE); 175 /* Immediate data comes after the BTH */ 176 ohdr->u.imm_data = wqe->wr.ex.imm_data; 177 hwords += 1; 178 } 179 if (wqe->wr.send_flags & IB_SEND_SOLICITED) 180 bth0 |= IB_BTH_SOLICITED; 181 qp->s_wqe = wqe; 182 if (++qp->s_cur >= qp->s_size) 183 qp->s_cur = 0; 184 break; 185 186 case IB_WR_RDMA_WRITE: 187 case IB_WR_RDMA_WRITE_WITH_IMM: 188 ohdr->u.rc.reth.vaddr = 189 cpu_to_be64(wqe->rdma_wr.remote_addr); 190 ohdr->u.rc.reth.rkey = 191 cpu_to_be32(wqe->rdma_wr.rkey); 192 ohdr->u.rc.reth.length = cpu_to_be32(len); 193 hwords += sizeof(struct ib_reth) / 4; 194 if (len > pmtu) { 195 qp->s_state = OP(RDMA_WRITE_FIRST); 196 len = pmtu; 197 break; 198 } 199 if (wqe->wr.opcode == IB_WR_RDMA_WRITE) { 200 qp->s_state = OP(RDMA_WRITE_ONLY); 201 } else { 202 qp->s_state = 203 OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE); 204 /* Immediate data comes after the RETH */ 205 ohdr->u.rc.imm_data = wqe->wr.ex.imm_data; 206 hwords += 1; 207 if (wqe->wr.send_flags & IB_SEND_SOLICITED) 208 bth0 |= IB_BTH_SOLICITED; 209 } 210 qp->s_wqe = wqe; 211 if (++qp->s_cur >= qp->s_size) 212 qp->s_cur = 0; 213 break; 214 215 default: 216 goto bail; 217 } 218 break; 219 220 case OP(SEND_FIRST): 221 qp->s_state = OP(SEND_MIDDLE); 222 /* FALLTHROUGH */ 223 case OP(SEND_MIDDLE): 224 len = qp->s_len; 225 if (len > pmtu) { 226 len = pmtu; 227 middle = HFI1_CAP_IS_KSET(SDMA_AHG); 228 break; 229 } 230 if (wqe->wr.opcode == IB_WR_SEND) { 231 qp->s_state = OP(SEND_LAST); 232 } else { 233 qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE); 234 /* Immediate data comes after the BTH */ 235 ohdr->u.imm_data = wqe->wr.ex.imm_data; 236 hwords += 1; 237 } 238 if (wqe->wr.send_flags & IB_SEND_SOLICITED) 239 bth0 |= IB_BTH_SOLICITED; 240 qp->s_wqe = wqe; 241 if (++qp->s_cur >= qp->s_size) 242 qp->s_cur = 0; 243 break; 244 245 case OP(RDMA_WRITE_FIRST): 246 qp->s_state = OP(RDMA_WRITE_MIDDLE); 247 /* FALLTHROUGH */ 248 case OP(RDMA_WRITE_MIDDLE): 249 len = qp->s_len; 250 if (len > pmtu) { 251 len = pmtu; 252 middle = HFI1_CAP_IS_KSET(SDMA_AHG); 253 break; 254 } 255 if (wqe->wr.opcode == IB_WR_RDMA_WRITE) { 256 qp->s_state = OP(RDMA_WRITE_LAST); 257 } else { 258 qp->s_state = 259 OP(RDMA_WRITE_LAST_WITH_IMMEDIATE); 260 /* Immediate data comes after the BTH */ 261 ohdr->u.imm_data = wqe->wr.ex.imm_data; 262 hwords += 1; 263 if (wqe->wr.send_flags & IB_SEND_SOLICITED) 264 bth0 |= IB_BTH_SOLICITED; 265 } 266 qp->s_wqe = wqe; 267 if (++qp->s_cur >= qp->s_size) 268 qp->s_cur = 0; 269 break; 270 } 271 qp->s_len -= len; 272 qp->s_hdrwords = hwords; 273 ps->s_txreq->sde = priv->s_sde; 274 ps->s_txreq->ss = &qp->s_sge; 275 ps->s_txreq->s_cur_size = len; 276 hfi1_make_ruc_header(qp, ohdr, bth0 | (qp->s_state << 24), 277 mask_psn(qp->s_psn++), middle, ps); 278 /* pbc */ 279 ps->s_txreq->hdr_dwords = qp->s_hdrwords + 2; 280 return 1; 281 282 done_free_tx: 283 hfi1_put_txreq(ps->s_txreq); 284 ps->s_txreq = NULL; 285 return 1; 286 287 bail: 288 hfi1_put_txreq(ps->s_txreq); 289 290 bail_no_tx: 291 ps->s_txreq = NULL; 292 qp->s_flags &= ~RVT_S_BUSY; 293 qp->s_hdrwords = 0; 294 return 0; 295 } 296 297 /** 298 * hfi1_uc_rcv - handle an incoming UC packet 299 * @ibp: the port the packet came in on 300 * @hdr: the header of the packet 301 * @rcv_flags: flags relevant to rcv processing 302 * @data: the packet data 303 * @tlen: the length of the packet 304 * @qp: the QP for this packet. 305 * 306 * This is called from qp_rcv() to process an incoming UC packet 307 * for the given QP. 308 * Called at interrupt level. 309 */ 310 void hfi1_uc_rcv(struct hfi1_packet *packet) 311 { 312 struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd); 313 void *data = packet->payload; 314 u32 tlen = packet->tlen; 315 struct rvt_qp *qp = packet->qp; 316 struct ib_other_headers *ohdr = packet->ohdr; 317 u32 opcode = packet->opcode; 318 u32 hdrsize = packet->hlen; 319 u32 psn; 320 u32 pad = packet->pad; 321 struct ib_wc wc; 322 u32 pmtu = qp->pmtu; 323 struct ib_reth *reth; 324 int ret; 325 u8 extra_bytes = pad + packet->extra_byte + (SIZE_OF_CRC << 2); 326 327 if (hfi1_ruc_check_hdr(ibp, packet)) 328 return; 329 330 process_ecn(qp, packet, true); 331 332 psn = ib_bth_get_psn(ohdr); 333 /* Compare the PSN verses the expected PSN. */ 334 if (unlikely(cmp_psn(psn, qp->r_psn) != 0)) { 335 /* 336 * Handle a sequence error. 337 * Silently drop any current message. 338 */ 339 qp->r_psn = psn; 340 inv: 341 if (qp->r_state == OP(SEND_FIRST) || 342 qp->r_state == OP(SEND_MIDDLE)) { 343 set_bit(RVT_R_REWIND_SGE, &qp->r_aflags); 344 qp->r_sge.num_sge = 0; 345 } else { 346 rvt_put_ss(&qp->r_sge); 347 } 348 qp->r_state = OP(SEND_LAST); 349 switch (opcode) { 350 case OP(SEND_FIRST): 351 case OP(SEND_ONLY): 352 case OP(SEND_ONLY_WITH_IMMEDIATE): 353 goto send_first; 354 355 case OP(RDMA_WRITE_FIRST): 356 case OP(RDMA_WRITE_ONLY): 357 case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): 358 goto rdma_first; 359 360 default: 361 goto drop; 362 } 363 } 364 365 /* Check for opcode sequence errors. */ 366 switch (qp->r_state) { 367 case OP(SEND_FIRST): 368 case OP(SEND_MIDDLE): 369 if (opcode == OP(SEND_MIDDLE) || 370 opcode == OP(SEND_LAST) || 371 opcode == OP(SEND_LAST_WITH_IMMEDIATE)) 372 break; 373 goto inv; 374 375 case OP(RDMA_WRITE_FIRST): 376 case OP(RDMA_WRITE_MIDDLE): 377 if (opcode == OP(RDMA_WRITE_MIDDLE) || 378 opcode == OP(RDMA_WRITE_LAST) || 379 opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE)) 380 break; 381 goto inv; 382 383 default: 384 if (opcode == OP(SEND_FIRST) || 385 opcode == OP(SEND_ONLY) || 386 opcode == OP(SEND_ONLY_WITH_IMMEDIATE) || 387 opcode == OP(RDMA_WRITE_FIRST) || 388 opcode == OP(RDMA_WRITE_ONLY) || 389 opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) 390 break; 391 goto inv; 392 } 393 394 if (qp->state == IB_QPS_RTR && !(qp->r_flags & RVT_R_COMM_EST)) 395 rvt_comm_est(qp); 396 397 /* OK, process the packet. */ 398 switch (opcode) { 399 case OP(SEND_FIRST): 400 case OP(SEND_ONLY): 401 case OP(SEND_ONLY_WITH_IMMEDIATE): 402 send_first: 403 if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags)) { 404 qp->r_sge = qp->s_rdma_read_sge; 405 } else { 406 ret = hfi1_rvt_get_rwqe(qp, 0); 407 if (ret < 0) 408 goto op_err; 409 if (!ret) 410 goto drop; 411 /* 412 * qp->s_rdma_read_sge will be the owner 413 * of the mr references. 414 */ 415 qp->s_rdma_read_sge = qp->r_sge; 416 } 417 qp->r_rcv_len = 0; 418 if (opcode == OP(SEND_ONLY)) 419 goto no_immediate_data; 420 else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE)) 421 goto send_last_imm; 422 /* FALLTHROUGH */ 423 case OP(SEND_MIDDLE): 424 /* Check for invalid length PMTU or posted rwqe len. */ 425 /* 426 * There will be no padding for 9B packet but 16B packets 427 * will come in with some padding since we always add 428 * CRC and LT bytes which will need to be flit aligned 429 */ 430 if (unlikely(tlen != (hdrsize + pmtu + extra_bytes))) 431 goto rewind; 432 qp->r_rcv_len += pmtu; 433 if (unlikely(qp->r_rcv_len > qp->r_len)) 434 goto rewind; 435 hfi1_copy_sge(&qp->r_sge, data, pmtu, false, false); 436 break; 437 438 case OP(SEND_LAST_WITH_IMMEDIATE): 439 send_last_imm: 440 wc.ex.imm_data = ohdr->u.imm_data; 441 wc.wc_flags = IB_WC_WITH_IMM; 442 goto send_last; 443 case OP(SEND_LAST): 444 no_immediate_data: 445 wc.ex.imm_data = 0; 446 wc.wc_flags = 0; 447 send_last: 448 /* Check for invalid length. */ 449 /* LAST len should be >= 1 */ 450 if (unlikely(tlen < (hdrsize + extra_bytes))) 451 goto rewind; 452 /* Don't count the CRC. */ 453 tlen -= (hdrsize + extra_bytes); 454 wc.byte_len = tlen + qp->r_rcv_len; 455 if (unlikely(wc.byte_len > qp->r_len)) 456 goto rewind; 457 wc.opcode = IB_WC_RECV; 458 hfi1_copy_sge(&qp->r_sge, data, tlen, false, false); 459 rvt_put_ss(&qp->s_rdma_read_sge); 460 last_imm: 461 wc.wr_id = qp->r_wr_id; 462 wc.status = IB_WC_SUCCESS; 463 wc.qp = &qp->ibqp; 464 wc.src_qp = qp->remote_qpn; 465 wc.slid = rdma_ah_get_dlid(&qp->remote_ah_attr) & U16_MAX; 466 /* 467 * It seems that IB mandates the presence of an SL in a 468 * work completion only for the UD transport (see section 469 * 11.4.2 of IBTA Vol. 1). 470 * 471 * However, the way the SL is chosen below is consistent 472 * with the way that IB/qib works and is trying avoid 473 * introducing incompatibilities. 474 * 475 * See also OPA Vol. 1, section 9.7.6, and table 9-17. 476 */ 477 wc.sl = rdma_ah_get_sl(&qp->remote_ah_attr); 478 /* zero fields that are N/A */ 479 wc.vendor_err = 0; 480 wc.pkey_index = 0; 481 wc.dlid_path_bits = 0; 482 wc.port_num = 0; 483 /* Signal completion event if the solicited bit is set. */ 484 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc, 485 (ohdr->bth[0] & 486 cpu_to_be32(IB_BTH_SOLICITED)) != 0); 487 break; 488 489 case OP(RDMA_WRITE_FIRST): 490 case OP(RDMA_WRITE_ONLY): 491 case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */ 492 rdma_first: 493 if (unlikely(!(qp->qp_access_flags & 494 IB_ACCESS_REMOTE_WRITE))) { 495 goto drop; 496 } 497 reth = &ohdr->u.rc.reth; 498 qp->r_len = be32_to_cpu(reth->length); 499 qp->r_rcv_len = 0; 500 qp->r_sge.sg_list = NULL; 501 if (qp->r_len != 0) { 502 u32 rkey = be32_to_cpu(reth->rkey); 503 u64 vaddr = be64_to_cpu(reth->vaddr); 504 int ok; 505 506 /* Check rkey */ 507 ok = rvt_rkey_ok(qp, &qp->r_sge.sge, qp->r_len, 508 vaddr, rkey, IB_ACCESS_REMOTE_WRITE); 509 if (unlikely(!ok)) 510 goto drop; 511 qp->r_sge.num_sge = 1; 512 } else { 513 qp->r_sge.num_sge = 0; 514 qp->r_sge.sge.mr = NULL; 515 qp->r_sge.sge.vaddr = NULL; 516 qp->r_sge.sge.length = 0; 517 qp->r_sge.sge.sge_length = 0; 518 } 519 if (opcode == OP(RDMA_WRITE_ONLY)) { 520 goto rdma_last; 521 } else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) { 522 wc.ex.imm_data = ohdr->u.rc.imm_data; 523 goto rdma_last_imm; 524 } 525 /* FALLTHROUGH */ 526 case OP(RDMA_WRITE_MIDDLE): 527 /* Check for invalid length PMTU or posted rwqe len. */ 528 if (unlikely(tlen != (hdrsize + pmtu + 4))) 529 goto drop; 530 qp->r_rcv_len += pmtu; 531 if (unlikely(qp->r_rcv_len > qp->r_len)) 532 goto drop; 533 hfi1_copy_sge(&qp->r_sge, data, pmtu, true, false); 534 break; 535 536 case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE): 537 wc.ex.imm_data = ohdr->u.imm_data; 538 rdma_last_imm: 539 wc.wc_flags = IB_WC_WITH_IMM; 540 541 /* Check for invalid length. */ 542 /* LAST len should be >= 1 */ 543 if (unlikely(tlen < (hdrsize + pad + 4))) 544 goto drop; 545 /* Don't count the CRC. */ 546 tlen -= (hdrsize + extra_bytes); 547 if (unlikely(tlen + qp->r_rcv_len != qp->r_len)) 548 goto drop; 549 if (test_and_clear_bit(RVT_R_REWIND_SGE, &qp->r_aflags)) { 550 rvt_put_ss(&qp->s_rdma_read_sge); 551 } else { 552 ret = hfi1_rvt_get_rwqe(qp, 1); 553 if (ret < 0) 554 goto op_err; 555 if (!ret) 556 goto drop; 557 } 558 wc.byte_len = qp->r_len; 559 wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; 560 hfi1_copy_sge(&qp->r_sge, data, tlen, true, false); 561 rvt_put_ss(&qp->r_sge); 562 goto last_imm; 563 564 case OP(RDMA_WRITE_LAST): 565 rdma_last: 566 /* Check for invalid length. */ 567 /* LAST len should be >= 1 */ 568 if (unlikely(tlen < (hdrsize + pad + 4))) 569 goto drop; 570 /* Don't count the CRC. */ 571 tlen -= (hdrsize + extra_bytes); 572 if (unlikely(tlen + qp->r_rcv_len != qp->r_len)) 573 goto drop; 574 hfi1_copy_sge(&qp->r_sge, data, tlen, true, false); 575 rvt_put_ss(&qp->r_sge); 576 break; 577 578 default: 579 /* Drop packet for unknown opcodes. */ 580 goto drop; 581 } 582 qp->r_psn++; 583 qp->r_state = opcode; 584 return; 585 586 rewind: 587 set_bit(RVT_R_REWIND_SGE, &qp->r_aflags); 588 qp->r_sge.num_sge = 0; 589 drop: 590 ibp->rvp.n_pkt_drops++; 591 return; 592 593 op_err: 594 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR); 595 } 596