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 <linux/spinlock.h> 35 #include <rdma/ib_smi.h> 36 37 #include "qib.h" 38 #include "qib_mad.h" 39 40 /* 41 * Switch to alternate path. 42 * The QP s_lock should be held and interrupts disabled. 43 */ 44 void qib_migrate_qp(struct rvt_qp *qp) 45 { 46 struct ib_event ev; 47 48 qp->s_mig_state = IB_MIG_MIGRATED; 49 qp->remote_ah_attr = qp->alt_ah_attr; 50 qp->port_num = rdma_ah_get_port_num(&qp->alt_ah_attr); 51 qp->s_pkey_index = qp->s_alt_pkey_index; 52 53 ev.device = qp->ibqp.device; 54 ev.element.qp = &qp->ibqp; 55 ev.event = IB_EVENT_PATH_MIG; 56 qp->ibqp.event_handler(&ev, qp->ibqp.qp_context); 57 } 58 59 static __be64 get_sguid(struct qib_ibport *ibp, unsigned index) 60 { 61 if (!index) { 62 struct qib_pportdata *ppd = ppd_from_ibp(ibp); 63 64 return ppd->guid; 65 } 66 return ibp->guids[index - 1]; 67 } 68 69 static int gid_ok(union ib_gid *gid, __be64 gid_prefix, __be64 id) 70 { 71 return (gid->global.interface_id == id && 72 (gid->global.subnet_prefix == gid_prefix || 73 gid->global.subnet_prefix == IB_DEFAULT_GID_PREFIX)); 74 } 75 76 /* 77 * 78 * This should be called with the QP r_lock held. 79 * 80 * The s_lock will be acquired around the qib_migrate_qp() call. 81 */ 82 int qib_ruc_check_hdr(struct qib_ibport *ibp, struct ib_header *hdr, 83 int has_grh, struct rvt_qp *qp, u32 bth0) 84 { 85 __be64 guid; 86 unsigned long flags; 87 88 if (qp->s_mig_state == IB_MIG_ARMED && (bth0 & IB_BTH_MIG_REQ)) { 89 if (!has_grh) { 90 if (rdma_ah_get_ah_flags(&qp->alt_ah_attr) & 91 IB_AH_GRH) 92 goto err; 93 } else { 94 const struct ib_global_route *grh; 95 96 if (!(rdma_ah_get_ah_flags(&qp->alt_ah_attr) & 97 IB_AH_GRH)) 98 goto err; 99 grh = rdma_ah_read_grh(&qp->alt_ah_attr); 100 guid = get_sguid(ibp, grh->sgid_index); 101 if (!gid_ok(&hdr->u.l.grh.dgid, 102 ibp->rvp.gid_prefix, guid)) 103 goto err; 104 if (!gid_ok(&hdr->u.l.grh.sgid, 105 grh->dgid.global.subnet_prefix, 106 grh->dgid.global.interface_id)) 107 goto err; 108 } 109 if (!qib_pkey_ok((u16)bth0, 110 qib_get_pkey(ibp, qp->s_alt_pkey_index))) { 111 qib_bad_pkey(ibp, 112 (u16)bth0, 113 (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF, 114 0, qp->ibqp.qp_num, 115 hdr->lrh[3], hdr->lrh[1]); 116 goto err; 117 } 118 /* Validate the SLID. See Ch. 9.6.1.5 and 17.2.8 */ 119 if ((be16_to_cpu(hdr->lrh[3]) != 120 rdma_ah_get_dlid(&qp->alt_ah_attr)) || 121 ppd_from_ibp(ibp)->port != 122 rdma_ah_get_port_num(&qp->alt_ah_attr)) 123 goto err; 124 spin_lock_irqsave(&qp->s_lock, flags); 125 qib_migrate_qp(qp); 126 spin_unlock_irqrestore(&qp->s_lock, flags); 127 } else { 128 if (!has_grh) { 129 if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) & 130 IB_AH_GRH) 131 goto err; 132 } else { 133 const struct ib_global_route *grh; 134 135 if (!(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & 136 IB_AH_GRH)) 137 goto err; 138 grh = rdma_ah_read_grh(&qp->remote_ah_attr); 139 guid = get_sguid(ibp, grh->sgid_index); 140 if (!gid_ok(&hdr->u.l.grh.dgid, 141 ibp->rvp.gid_prefix, guid)) 142 goto err; 143 if (!gid_ok(&hdr->u.l.grh.sgid, 144 grh->dgid.global.subnet_prefix, 145 grh->dgid.global.interface_id)) 146 goto err; 147 } 148 if (!qib_pkey_ok((u16)bth0, 149 qib_get_pkey(ibp, qp->s_pkey_index))) { 150 qib_bad_pkey(ibp, 151 (u16)bth0, 152 (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF, 153 0, qp->ibqp.qp_num, 154 hdr->lrh[3], hdr->lrh[1]); 155 goto err; 156 } 157 /* Validate the SLID. See Ch. 9.6.1.5 */ 158 if (be16_to_cpu(hdr->lrh[3]) != 159 rdma_ah_get_dlid(&qp->remote_ah_attr) || 160 ppd_from_ibp(ibp)->port != qp->port_num) 161 goto err; 162 if (qp->s_mig_state == IB_MIG_REARM && 163 !(bth0 & IB_BTH_MIG_REQ)) 164 qp->s_mig_state = IB_MIG_ARMED; 165 } 166 167 return 0; 168 169 err: 170 return 1; 171 } 172 173 /** 174 * qib_ruc_loopback - handle UC and RC lookback requests 175 * @sqp: the sending QP 176 * 177 * This is called from qib_do_send() to 178 * forward a WQE addressed to the same HCA. 179 * Note that although we are single threaded due to the tasklet, we still 180 * have to protect against post_send(). We don't have to worry about 181 * receive interrupts since this is a connected protocol and all packets 182 * will pass through here. 183 */ 184 static void qib_ruc_loopback(struct rvt_qp *sqp) 185 { 186 struct qib_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num); 187 struct qib_pportdata *ppd = ppd_from_ibp(ibp); 188 struct qib_devdata *dd = ppd->dd; 189 struct rvt_dev_info *rdi = &dd->verbs_dev.rdi; 190 struct rvt_qp *qp; 191 struct rvt_swqe *wqe; 192 struct rvt_sge *sge; 193 unsigned long flags; 194 struct ib_wc wc; 195 u64 sdata; 196 atomic64_t *maddr; 197 enum ib_wc_status send_status; 198 int release; 199 int ret; 200 201 rcu_read_lock(); 202 /* 203 * Note that we check the responder QP state after 204 * checking the requester's state. 205 */ 206 qp = rvt_lookup_qpn(rdi, &ibp->rvp, sqp->remote_qpn); 207 if (!qp) 208 goto done; 209 210 spin_lock_irqsave(&sqp->s_lock, flags); 211 212 /* Return if we are already busy processing a work request. */ 213 if ((sqp->s_flags & (RVT_S_BUSY | RVT_S_ANY_WAIT)) || 214 !(ib_rvt_state_ops[sqp->state] & RVT_PROCESS_OR_FLUSH_SEND)) 215 goto unlock; 216 217 sqp->s_flags |= RVT_S_BUSY; 218 219 again: 220 if (sqp->s_last == READ_ONCE(sqp->s_head)) 221 goto clr_busy; 222 wqe = rvt_get_swqe_ptr(sqp, sqp->s_last); 223 224 /* Return if it is not OK to start a new work reqeust. */ 225 if (!(ib_rvt_state_ops[sqp->state] & RVT_PROCESS_NEXT_SEND_OK)) { 226 if (!(ib_rvt_state_ops[sqp->state] & RVT_FLUSH_SEND)) 227 goto clr_busy; 228 /* We are in the error state, flush the work request. */ 229 send_status = IB_WC_WR_FLUSH_ERR; 230 goto flush_send; 231 } 232 233 /* 234 * We can rely on the entry not changing without the s_lock 235 * being held until we update s_last. 236 * We increment s_cur to indicate s_last is in progress. 237 */ 238 if (sqp->s_last == sqp->s_cur) { 239 if (++sqp->s_cur >= sqp->s_size) 240 sqp->s_cur = 0; 241 } 242 spin_unlock_irqrestore(&sqp->s_lock, flags); 243 244 if (!qp || !(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK) || 245 qp->ibqp.qp_type != sqp->ibqp.qp_type) { 246 ibp->rvp.n_pkt_drops++; 247 /* 248 * For RC, the requester would timeout and retry so 249 * shortcut the timeouts and just signal too many retries. 250 */ 251 if (sqp->ibqp.qp_type == IB_QPT_RC) 252 send_status = IB_WC_RETRY_EXC_ERR; 253 else 254 send_status = IB_WC_SUCCESS; 255 goto serr; 256 } 257 258 memset(&wc, 0, sizeof(wc)); 259 send_status = IB_WC_SUCCESS; 260 261 release = 1; 262 sqp->s_sge.sge = wqe->sg_list[0]; 263 sqp->s_sge.sg_list = wqe->sg_list + 1; 264 sqp->s_sge.num_sge = wqe->wr.num_sge; 265 sqp->s_len = wqe->length; 266 switch (wqe->wr.opcode) { 267 case IB_WR_SEND_WITH_IMM: 268 wc.wc_flags = IB_WC_WITH_IMM; 269 wc.ex.imm_data = wqe->wr.ex.imm_data; 270 /* FALLTHROUGH */ 271 case IB_WR_SEND: 272 ret = rvt_get_rwqe(qp, false); 273 if (ret < 0) 274 goto op_err; 275 if (!ret) 276 goto rnr_nak; 277 break; 278 279 case IB_WR_RDMA_WRITE_WITH_IMM: 280 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) 281 goto inv_err; 282 wc.wc_flags = IB_WC_WITH_IMM; 283 wc.ex.imm_data = wqe->wr.ex.imm_data; 284 ret = rvt_get_rwqe(qp, true); 285 if (ret < 0) 286 goto op_err; 287 if (!ret) 288 goto rnr_nak; 289 /* FALLTHROUGH */ 290 case IB_WR_RDMA_WRITE: 291 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) 292 goto inv_err; 293 if (wqe->length == 0) 294 break; 295 if (unlikely(!rvt_rkey_ok(qp, &qp->r_sge.sge, wqe->length, 296 wqe->rdma_wr.remote_addr, 297 wqe->rdma_wr.rkey, 298 IB_ACCESS_REMOTE_WRITE))) 299 goto acc_err; 300 qp->r_sge.sg_list = NULL; 301 qp->r_sge.num_sge = 1; 302 qp->r_sge.total_len = wqe->length; 303 break; 304 305 case IB_WR_RDMA_READ: 306 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ))) 307 goto inv_err; 308 if (unlikely(!rvt_rkey_ok(qp, &sqp->s_sge.sge, wqe->length, 309 wqe->rdma_wr.remote_addr, 310 wqe->rdma_wr.rkey, 311 IB_ACCESS_REMOTE_READ))) 312 goto acc_err; 313 release = 0; 314 sqp->s_sge.sg_list = NULL; 315 sqp->s_sge.num_sge = 1; 316 qp->r_sge.sge = wqe->sg_list[0]; 317 qp->r_sge.sg_list = wqe->sg_list + 1; 318 qp->r_sge.num_sge = wqe->wr.num_sge; 319 qp->r_sge.total_len = wqe->length; 320 break; 321 322 case IB_WR_ATOMIC_CMP_AND_SWP: 323 case IB_WR_ATOMIC_FETCH_AND_ADD: 324 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) 325 goto inv_err; 326 if (unlikely(!rvt_rkey_ok(qp, &qp->r_sge.sge, sizeof(u64), 327 wqe->atomic_wr.remote_addr, 328 wqe->atomic_wr.rkey, 329 IB_ACCESS_REMOTE_ATOMIC))) 330 goto acc_err; 331 /* Perform atomic OP and save result. */ 332 maddr = (atomic64_t *) qp->r_sge.sge.vaddr; 333 sdata = wqe->atomic_wr.compare_add; 334 *(u64 *) sqp->s_sge.sge.vaddr = 335 (wqe->atomic_wr.wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) ? 336 (u64) atomic64_add_return(sdata, maddr) - sdata : 337 (u64) cmpxchg((u64 *) qp->r_sge.sge.vaddr, 338 sdata, wqe->atomic_wr.swap); 339 rvt_put_mr(qp->r_sge.sge.mr); 340 qp->r_sge.num_sge = 0; 341 goto send_comp; 342 343 default: 344 send_status = IB_WC_LOC_QP_OP_ERR; 345 goto serr; 346 } 347 348 sge = &sqp->s_sge.sge; 349 while (sqp->s_len) { 350 u32 len = sqp->s_len; 351 352 if (len > sge->length) 353 len = sge->length; 354 if (len > sge->sge_length) 355 len = sge->sge_length; 356 BUG_ON(len == 0); 357 qib_copy_sge(&qp->r_sge, sge->vaddr, len, release); 358 sge->vaddr += len; 359 sge->length -= len; 360 sge->sge_length -= len; 361 if (sge->sge_length == 0) { 362 if (!release) 363 rvt_put_mr(sge->mr); 364 if (--sqp->s_sge.num_sge) 365 *sge = *sqp->s_sge.sg_list++; 366 } else if (sge->length == 0 && sge->mr->lkey) { 367 if (++sge->n >= RVT_SEGSZ) { 368 if (++sge->m >= sge->mr->mapsz) 369 break; 370 sge->n = 0; 371 } 372 sge->vaddr = 373 sge->mr->map[sge->m]->segs[sge->n].vaddr; 374 sge->length = 375 sge->mr->map[sge->m]->segs[sge->n].length; 376 } 377 sqp->s_len -= len; 378 } 379 if (release) 380 rvt_put_ss(&qp->r_sge); 381 382 if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags)) 383 goto send_comp; 384 385 if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM) 386 wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; 387 else 388 wc.opcode = IB_WC_RECV; 389 wc.wr_id = qp->r_wr_id; 390 wc.status = IB_WC_SUCCESS; 391 wc.byte_len = wqe->length; 392 wc.qp = &qp->ibqp; 393 wc.src_qp = qp->remote_qpn; 394 wc.slid = rdma_ah_get_dlid(&qp->remote_ah_attr); 395 wc.sl = rdma_ah_get_sl(&qp->remote_ah_attr); 396 wc.port_num = 1; 397 /* Signal completion event if the solicited bit is set. */ 398 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc, 399 wqe->wr.send_flags & IB_SEND_SOLICITED); 400 401 send_comp: 402 spin_lock_irqsave(&sqp->s_lock, flags); 403 ibp->rvp.n_loop_pkts++; 404 flush_send: 405 sqp->s_rnr_retry = sqp->s_rnr_retry_cnt; 406 qib_send_complete(sqp, wqe, send_status); 407 goto again; 408 409 rnr_nak: 410 /* Handle RNR NAK */ 411 if (qp->ibqp.qp_type == IB_QPT_UC) 412 goto send_comp; 413 ibp->rvp.n_rnr_naks++; 414 /* 415 * Note: we don't need the s_lock held since the BUSY flag 416 * makes this single threaded. 417 */ 418 if (sqp->s_rnr_retry == 0) { 419 send_status = IB_WC_RNR_RETRY_EXC_ERR; 420 goto serr; 421 } 422 if (sqp->s_rnr_retry_cnt < 7) 423 sqp->s_rnr_retry--; 424 spin_lock_irqsave(&sqp->s_lock, flags); 425 if (!(ib_rvt_state_ops[sqp->state] & RVT_PROCESS_RECV_OK)) 426 goto clr_busy; 427 rvt_add_rnr_timer(sqp, qp->r_min_rnr_timer << 428 IB_AETH_CREDIT_SHIFT); 429 goto clr_busy; 430 431 op_err: 432 send_status = IB_WC_REM_OP_ERR; 433 wc.status = IB_WC_LOC_QP_OP_ERR; 434 goto err; 435 436 inv_err: 437 send_status = IB_WC_REM_INV_REQ_ERR; 438 wc.status = IB_WC_LOC_QP_OP_ERR; 439 goto err; 440 441 acc_err: 442 send_status = IB_WC_REM_ACCESS_ERR; 443 wc.status = IB_WC_LOC_PROT_ERR; 444 err: 445 /* responder goes to error state */ 446 rvt_rc_error(qp, wc.status); 447 448 serr: 449 spin_lock_irqsave(&sqp->s_lock, flags); 450 qib_send_complete(sqp, wqe, send_status); 451 if (sqp->ibqp.qp_type == IB_QPT_RC) { 452 int lastwqe = rvt_error_qp(sqp, IB_WC_WR_FLUSH_ERR); 453 454 sqp->s_flags &= ~RVT_S_BUSY; 455 spin_unlock_irqrestore(&sqp->s_lock, flags); 456 if (lastwqe) { 457 struct ib_event ev; 458 459 ev.device = sqp->ibqp.device; 460 ev.element.qp = &sqp->ibqp; 461 ev.event = IB_EVENT_QP_LAST_WQE_REACHED; 462 sqp->ibqp.event_handler(&ev, sqp->ibqp.qp_context); 463 } 464 goto done; 465 } 466 clr_busy: 467 sqp->s_flags &= ~RVT_S_BUSY; 468 unlock: 469 spin_unlock_irqrestore(&sqp->s_lock, flags); 470 done: 471 rcu_read_unlock(); 472 } 473 474 /** 475 * qib_make_grh - construct a GRH header 476 * @ibp: a pointer to the IB port 477 * @hdr: a pointer to the GRH header being constructed 478 * @grh: the global route address to send to 479 * @hwords: the number of 32 bit words of header being sent 480 * @nwords: the number of 32 bit words of data being sent 481 * 482 * Return the size of the header in 32 bit words. 483 */ 484 u32 qib_make_grh(struct qib_ibport *ibp, struct ib_grh *hdr, 485 const struct ib_global_route *grh, u32 hwords, u32 nwords) 486 { 487 hdr->version_tclass_flow = 488 cpu_to_be32((IB_GRH_VERSION << IB_GRH_VERSION_SHIFT) | 489 (grh->traffic_class << IB_GRH_TCLASS_SHIFT) | 490 (grh->flow_label << IB_GRH_FLOW_SHIFT)); 491 hdr->paylen = cpu_to_be16((hwords - 2 + nwords + SIZE_OF_CRC) << 2); 492 /* next_hdr is defined by C8-7 in ch. 8.4.1 */ 493 hdr->next_hdr = IB_GRH_NEXT_HDR; 494 hdr->hop_limit = grh->hop_limit; 495 /* The SGID is 32-bit aligned. */ 496 hdr->sgid.global.subnet_prefix = ibp->rvp.gid_prefix; 497 if (!grh->sgid_index) 498 hdr->sgid.global.interface_id = ppd_from_ibp(ibp)->guid; 499 else if (grh->sgid_index < QIB_GUIDS_PER_PORT) 500 hdr->sgid.global.interface_id = ibp->guids[grh->sgid_index - 1]; 501 hdr->dgid = grh->dgid; 502 503 /* GRH header size in 32-bit words. */ 504 return sizeof(struct ib_grh) / sizeof(u32); 505 } 506 507 void qib_make_ruc_header(struct rvt_qp *qp, struct ib_other_headers *ohdr, 508 u32 bth0, u32 bth2) 509 { 510 struct qib_qp_priv *priv = qp->priv; 511 struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); 512 u16 lrh0; 513 u32 nwords; 514 u32 extra_bytes; 515 516 /* Construct the header. */ 517 extra_bytes = -qp->s_cur_size & 3; 518 nwords = (qp->s_cur_size + extra_bytes) >> 2; 519 lrh0 = QIB_LRH_BTH; 520 if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)) { 521 qp->s_hdrwords += 522 qib_make_grh(ibp, &priv->s_hdr->u.l.grh, 523 rdma_ah_read_grh(&qp->remote_ah_attr), 524 qp->s_hdrwords, nwords); 525 lrh0 = QIB_LRH_GRH; 526 } 527 lrh0 |= ibp->sl_to_vl[rdma_ah_get_sl(&qp->remote_ah_attr)] << 12 | 528 rdma_ah_get_sl(&qp->remote_ah_attr) << 4; 529 priv->s_hdr->lrh[0] = cpu_to_be16(lrh0); 530 priv->s_hdr->lrh[1] = 531 cpu_to_be16(rdma_ah_get_dlid(&qp->remote_ah_attr)); 532 priv->s_hdr->lrh[2] = 533 cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC); 534 priv->s_hdr->lrh[3] = 535 cpu_to_be16(ppd_from_ibp(ibp)->lid | 536 rdma_ah_get_path_bits(&qp->remote_ah_attr)); 537 bth0 |= qib_get_pkey(ibp, qp->s_pkey_index); 538 bth0 |= extra_bytes << 20; 539 if (qp->s_mig_state == IB_MIG_MIGRATED) 540 bth0 |= IB_BTH_MIG_REQ; 541 ohdr->bth[0] = cpu_to_be32(bth0); 542 ohdr->bth[1] = cpu_to_be32(qp->remote_qpn); 543 ohdr->bth[2] = cpu_to_be32(bth2); 544 this_cpu_inc(ibp->pmastats->n_unicast_xmit); 545 } 546 547 void _qib_do_send(struct work_struct *work) 548 { 549 struct qib_qp_priv *priv = container_of(work, struct qib_qp_priv, 550 s_work); 551 struct rvt_qp *qp = priv->owner; 552 553 qib_do_send(qp); 554 } 555 556 /** 557 * qib_do_send - perform a send on a QP 558 * @qp: pointer to the QP 559 * 560 * Process entries in the send work queue until credit or queue is 561 * exhausted. Only allow one CPU to send a packet per QP (tasklet). 562 * Otherwise, two threads could send packets out of order. 563 */ 564 void qib_do_send(struct rvt_qp *qp) 565 { 566 struct qib_qp_priv *priv = qp->priv; 567 struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); 568 struct qib_pportdata *ppd = ppd_from_ibp(ibp); 569 int (*make_req)(struct rvt_qp *qp, unsigned long *flags); 570 unsigned long flags; 571 572 if ((qp->ibqp.qp_type == IB_QPT_RC || 573 qp->ibqp.qp_type == IB_QPT_UC) && 574 (rdma_ah_get_dlid(&qp->remote_ah_attr) & 575 ~((1 << ppd->lmc) - 1)) == ppd->lid) { 576 qib_ruc_loopback(qp); 577 return; 578 } 579 580 if (qp->ibqp.qp_type == IB_QPT_RC) 581 make_req = qib_make_rc_req; 582 else if (qp->ibqp.qp_type == IB_QPT_UC) 583 make_req = qib_make_uc_req; 584 else 585 make_req = qib_make_ud_req; 586 587 spin_lock_irqsave(&qp->s_lock, flags); 588 589 /* Return if we are already busy processing a work request. */ 590 if (!qib_send_ok(qp)) { 591 spin_unlock_irqrestore(&qp->s_lock, flags); 592 return; 593 } 594 595 qp->s_flags |= RVT_S_BUSY; 596 597 do { 598 /* Check for a constructed packet to be sent. */ 599 if (qp->s_hdrwords != 0) { 600 spin_unlock_irqrestore(&qp->s_lock, flags); 601 /* 602 * If the packet cannot be sent now, return and 603 * the send tasklet will be woken up later. 604 */ 605 if (qib_verbs_send(qp, priv->s_hdr, qp->s_hdrwords, 606 qp->s_cur_sge, qp->s_cur_size)) 607 return; 608 /* Record that s_hdr is empty. */ 609 qp->s_hdrwords = 0; 610 spin_lock_irqsave(&qp->s_lock, flags); 611 } 612 } while (make_req(qp, &flags)); 613 614 spin_unlock_irqrestore(&qp->s_lock, flags); 615 } 616 617 /* 618 * This should be called with s_lock held. 619 */ 620 void qib_send_complete(struct rvt_qp *qp, struct rvt_swqe *wqe, 621 enum ib_wc_status status) 622 { 623 u32 old_last, last; 624 625 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_OR_FLUSH_SEND)) 626 return; 627 628 last = qp->s_last; 629 old_last = last; 630 if (++last >= qp->s_size) 631 last = 0; 632 qp->s_last = last; 633 /* See post_send() */ 634 barrier(); 635 rvt_put_swqe(wqe); 636 if (qp->ibqp.qp_type == IB_QPT_UD || 637 qp->ibqp.qp_type == IB_QPT_SMI || 638 qp->ibqp.qp_type == IB_QPT_GSI) 639 atomic_dec(&ibah_to_rvtah(wqe->ud_wr.ah)->refcount); 640 641 rvt_qp_swqe_complete(qp, 642 wqe, 643 ib_qib_wc_opcode[wqe->wr.opcode], 644 status); 645 646 if (qp->s_acked == old_last) 647 qp->s_acked = last; 648 if (qp->s_cur == old_last) 649 qp->s_cur = last; 650 if (qp->s_tail == old_last) 651 qp->s_tail = last; 652 if (qp->state == IB_QPS_SQD && last == qp->s_cur) 653 qp->s_draining = 0; 654 } 655