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 * Validate a RWQE and fill in the SGE state. 42 * Return 1 if OK. 43 */ 44 static int qib_init_sge(struct rvt_qp *qp, struct rvt_rwqe *wqe) 45 { 46 int i, j, ret; 47 struct ib_wc wc; 48 struct rvt_lkey_table *rkt; 49 struct rvt_pd *pd; 50 struct rvt_sge_state *ss; 51 52 rkt = &to_idev(qp->ibqp.device)->rdi.lkey_table; 53 pd = ibpd_to_rvtpd(qp->ibqp.srq ? qp->ibqp.srq->pd : qp->ibqp.pd); 54 ss = &qp->r_sge; 55 ss->sg_list = qp->r_sg_list; 56 qp->r_len = 0; 57 for (i = j = 0; i < wqe->num_sge; i++) { 58 if (wqe->sg_list[i].length == 0) 59 continue; 60 /* Check LKEY */ 61 ret = rvt_lkey_ok(rkt, pd, j ? &ss->sg_list[j - 1] : &ss->sge, 62 NULL, &wqe->sg_list[i], 63 IB_ACCESS_LOCAL_WRITE); 64 if (unlikely(ret <= 0)) 65 goto bad_lkey; 66 qp->r_len += wqe->sg_list[i].length; 67 j++; 68 } 69 ss->num_sge = j; 70 ss->total_len = qp->r_len; 71 ret = 1; 72 goto bail; 73 74 bad_lkey: 75 while (j) { 76 struct rvt_sge *sge = --j ? &ss->sg_list[j - 1] : &ss->sge; 77 78 rvt_put_mr(sge->mr); 79 } 80 ss->num_sge = 0; 81 memset(&wc, 0, sizeof(wc)); 82 wc.wr_id = wqe->wr_id; 83 wc.status = IB_WC_LOC_PROT_ERR; 84 wc.opcode = IB_WC_RECV; 85 wc.qp = &qp->ibqp; 86 /* Signal solicited completion event. */ 87 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc, 1); 88 ret = 0; 89 bail: 90 return ret; 91 } 92 93 /** 94 * qib_get_rwqe - copy the next RWQE into the QP's RWQE 95 * @qp: the QP 96 * @wr_id_only: update qp->r_wr_id only, not qp->r_sge 97 * 98 * Return -1 if there is a local error, 0 if no RWQE is available, 99 * otherwise return 1. 100 * 101 * Can be called from interrupt level. 102 */ 103 int qib_get_rwqe(struct rvt_qp *qp, int wr_id_only) 104 { 105 unsigned long flags; 106 struct rvt_rq *rq; 107 struct rvt_rwq *wq; 108 struct rvt_srq *srq; 109 struct rvt_rwqe *wqe; 110 void (*handler)(struct ib_event *, void *); 111 u32 tail; 112 int ret; 113 114 if (qp->ibqp.srq) { 115 srq = ibsrq_to_rvtsrq(qp->ibqp.srq); 116 handler = srq->ibsrq.event_handler; 117 rq = &srq->rq; 118 } else { 119 srq = NULL; 120 handler = NULL; 121 rq = &qp->r_rq; 122 } 123 124 spin_lock_irqsave(&rq->lock, flags); 125 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) { 126 ret = 0; 127 goto unlock; 128 } 129 130 wq = rq->wq; 131 tail = wq->tail; 132 /* Validate tail before using it since it is user writable. */ 133 if (tail >= rq->size) 134 tail = 0; 135 if (unlikely(tail == wq->head)) { 136 ret = 0; 137 goto unlock; 138 } 139 /* Make sure entry is read after head index is read. */ 140 smp_rmb(); 141 wqe = rvt_get_rwqe_ptr(rq, tail); 142 /* 143 * Even though we update the tail index in memory, the verbs 144 * consumer is not supposed to post more entries until a 145 * completion is generated. 146 */ 147 if (++tail >= rq->size) 148 tail = 0; 149 wq->tail = tail; 150 if (!wr_id_only && !qib_init_sge(qp, wqe)) { 151 ret = -1; 152 goto unlock; 153 } 154 qp->r_wr_id = wqe->wr_id; 155 156 ret = 1; 157 set_bit(RVT_R_WRID_VALID, &qp->r_aflags); 158 if (handler) { 159 u32 n; 160 161 /* 162 * Validate head pointer value and compute 163 * the number of remaining WQEs. 164 */ 165 n = wq->head; 166 if (n >= rq->size) 167 n = 0; 168 if (n < tail) 169 n += rq->size - tail; 170 else 171 n -= tail; 172 if (n < srq->limit) { 173 struct ib_event ev; 174 175 srq->limit = 0; 176 spin_unlock_irqrestore(&rq->lock, flags); 177 ev.device = qp->ibqp.device; 178 ev.element.srq = qp->ibqp.srq; 179 ev.event = IB_EVENT_SRQ_LIMIT_REACHED; 180 handler(&ev, srq->ibsrq.srq_context); 181 goto bail; 182 } 183 } 184 unlock: 185 spin_unlock_irqrestore(&rq->lock, flags); 186 bail: 187 return ret; 188 } 189 190 /* 191 * Switch to alternate path. 192 * The QP s_lock should be held and interrupts disabled. 193 */ 194 void qib_migrate_qp(struct rvt_qp *qp) 195 { 196 struct ib_event ev; 197 198 qp->s_mig_state = IB_MIG_MIGRATED; 199 qp->remote_ah_attr = qp->alt_ah_attr; 200 qp->port_num = rdma_ah_get_port_num(&qp->alt_ah_attr); 201 qp->s_pkey_index = qp->s_alt_pkey_index; 202 203 ev.device = qp->ibqp.device; 204 ev.element.qp = &qp->ibqp; 205 ev.event = IB_EVENT_PATH_MIG; 206 qp->ibqp.event_handler(&ev, qp->ibqp.qp_context); 207 } 208 209 static __be64 get_sguid(struct qib_ibport *ibp, unsigned index) 210 { 211 if (!index) { 212 struct qib_pportdata *ppd = ppd_from_ibp(ibp); 213 214 return ppd->guid; 215 } 216 return ibp->guids[index - 1]; 217 } 218 219 static int gid_ok(union ib_gid *gid, __be64 gid_prefix, __be64 id) 220 { 221 return (gid->global.interface_id == id && 222 (gid->global.subnet_prefix == gid_prefix || 223 gid->global.subnet_prefix == IB_DEFAULT_GID_PREFIX)); 224 } 225 226 /* 227 * 228 * This should be called with the QP r_lock held. 229 * 230 * The s_lock will be acquired around the qib_migrate_qp() call. 231 */ 232 int qib_ruc_check_hdr(struct qib_ibport *ibp, struct ib_header *hdr, 233 int has_grh, struct rvt_qp *qp, u32 bth0) 234 { 235 __be64 guid; 236 unsigned long flags; 237 238 if (qp->s_mig_state == IB_MIG_ARMED && (bth0 & IB_BTH_MIG_REQ)) { 239 if (!has_grh) { 240 if (rdma_ah_get_ah_flags(&qp->alt_ah_attr) & 241 IB_AH_GRH) 242 goto err; 243 } else { 244 const struct ib_global_route *grh; 245 246 if (!(rdma_ah_get_ah_flags(&qp->alt_ah_attr) & 247 IB_AH_GRH)) 248 goto err; 249 grh = rdma_ah_read_grh(&qp->alt_ah_attr); 250 guid = get_sguid(ibp, grh->sgid_index); 251 if (!gid_ok(&hdr->u.l.grh.dgid, 252 ibp->rvp.gid_prefix, guid)) 253 goto err; 254 if (!gid_ok(&hdr->u.l.grh.sgid, 255 grh->dgid.global.subnet_prefix, 256 grh->dgid.global.interface_id)) 257 goto err; 258 } 259 if (!qib_pkey_ok((u16)bth0, 260 qib_get_pkey(ibp, qp->s_alt_pkey_index))) { 261 qib_bad_pkey(ibp, 262 (u16)bth0, 263 (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF, 264 0, qp->ibqp.qp_num, 265 hdr->lrh[3], hdr->lrh[1]); 266 goto err; 267 } 268 /* Validate the SLID. See Ch. 9.6.1.5 and 17.2.8 */ 269 if ((be16_to_cpu(hdr->lrh[3]) != 270 rdma_ah_get_dlid(&qp->alt_ah_attr)) || 271 ppd_from_ibp(ibp)->port != 272 rdma_ah_get_port_num(&qp->alt_ah_attr)) 273 goto err; 274 spin_lock_irqsave(&qp->s_lock, flags); 275 qib_migrate_qp(qp); 276 spin_unlock_irqrestore(&qp->s_lock, flags); 277 } else { 278 if (!has_grh) { 279 if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) & 280 IB_AH_GRH) 281 goto err; 282 } else { 283 const struct ib_global_route *grh; 284 285 if (!(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & 286 IB_AH_GRH)) 287 goto err; 288 grh = rdma_ah_read_grh(&qp->remote_ah_attr); 289 guid = get_sguid(ibp, grh->sgid_index); 290 if (!gid_ok(&hdr->u.l.grh.dgid, 291 ibp->rvp.gid_prefix, guid)) 292 goto err; 293 if (!gid_ok(&hdr->u.l.grh.sgid, 294 grh->dgid.global.subnet_prefix, 295 grh->dgid.global.interface_id)) 296 goto err; 297 } 298 if (!qib_pkey_ok((u16)bth0, 299 qib_get_pkey(ibp, qp->s_pkey_index))) { 300 qib_bad_pkey(ibp, 301 (u16)bth0, 302 (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF, 303 0, qp->ibqp.qp_num, 304 hdr->lrh[3], hdr->lrh[1]); 305 goto err; 306 } 307 /* Validate the SLID. See Ch. 9.6.1.5 */ 308 if (be16_to_cpu(hdr->lrh[3]) != 309 rdma_ah_get_dlid(&qp->remote_ah_attr) || 310 ppd_from_ibp(ibp)->port != qp->port_num) 311 goto err; 312 if (qp->s_mig_state == IB_MIG_REARM && 313 !(bth0 & IB_BTH_MIG_REQ)) 314 qp->s_mig_state = IB_MIG_ARMED; 315 } 316 317 return 0; 318 319 err: 320 return 1; 321 } 322 323 /** 324 * qib_ruc_loopback - handle UC and RC lookback requests 325 * @sqp: the sending QP 326 * 327 * This is called from qib_do_send() to 328 * forward a WQE addressed to the same HCA. 329 * Note that although we are single threaded due to the tasklet, we still 330 * have to protect against post_send(). We don't have to worry about 331 * receive interrupts since this is a connected protocol and all packets 332 * will pass through here. 333 */ 334 static void qib_ruc_loopback(struct rvt_qp *sqp) 335 { 336 struct qib_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num); 337 struct qib_pportdata *ppd = ppd_from_ibp(ibp); 338 struct qib_devdata *dd = ppd->dd; 339 struct rvt_dev_info *rdi = &dd->verbs_dev.rdi; 340 struct rvt_qp *qp; 341 struct rvt_swqe *wqe; 342 struct rvt_sge *sge; 343 unsigned long flags; 344 struct ib_wc wc; 345 u64 sdata; 346 atomic64_t *maddr; 347 enum ib_wc_status send_status; 348 int release; 349 int ret; 350 351 rcu_read_lock(); 352 /* 353 * Note that we check the responder QP state after 354 * checking the requester's state. 355 */ 356 qp = rvt_lookup_qpn(rdi, &ibp->rvp, sqp->remote_qpn); 357 if (!qp) 358 goto done; 359 360 spin_lock_irqsave(&sqp->s_lock, flags); 361 362 /* Return if we are already busy processing a work request. */ 363 if ((sqp->s_flags & (RVT_S_BUSY | RVT_S_ANY_WAIT)) || 364 !(ib_rvt_state_ops[sqp->state] & RVT_PROCESS_OR_FLUSH_SEND)) 365 goto unlock; 366 367 sqp->s_flags |= RVT_S_BUSY; 368 369 again: 370 if (sqp->s_last == READ_ONCE(sqp->s_head)) 371 goto clr_busy; 372 wqe = rvt_get_swqe_ptr(sqp, sqp->s_last); 373 374 /* Return if it is not OK to start a new work reqeust. */ 375 if (!(ib_rvt_state_ops[sqp->state] & RVT_PROCESS_NEXT_SEND_OK)) { 376 if (!(ib_rvt_state_ops[sqp->state] & RVT_FLUSH_SEND)) 377 goto clr_busy; 378 /* We are in the error state, flush the work request. */ 379 send_status = IB_WC_WR_FLUSH_ERR; 380 goto flush_send; 381 } 382 383 /* 384 * We can rely on the entry not changing without the s_lock 385 * being held until we update s_last. 386 * We increment s_cur to indicate s_last is in progress. 387 */ 388 if (sqp->s_last == sqp->s_cur) { 389 if (++sqp->s_cur >= sqp->s_size) 390 sqp->s_cur = 0; 391 } 392 spin_unlock_irqrestore(&sqp->s_lock, flags); 393 394 if (!qp || !(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK) || 395 qp->ibqp.qp_type != sqp->ibqp.qp_type) { 396 ibp->rvp.n_pkt_drops++; 397 /* 398 * For RC, the requester would timeout and retry so 399 * shortcut the timeouts and just signal too many retries. 400 */ 401 if (sqp->ibqp.qp_type == IB_QPT_RC) 402 send_status = IB_WC_RETRY_EXC_ERR; 403 else 404 send_status = IB_WC_SUCCESS; 405 goto serr; 406 } 407 408 memset(&wc, 0, sizeof(wc)); 409 send_status = IB_WC_SUCCESS; 410 411 release = 1; 412 sqp->s_sge.sge = wqe->sg_list[0]; 413 sqp->s_sge.sg_list = wqe->sg_list + 1; 414 sqp->s_sge.num_sge = wqe->wr.num_sge; 415 sqp->s_len = wqe->length; 416 switch (wqe->wr.opcode) { 417 case IB_WR_SEND_WITH_IMM: 418 wc.wc_flags = IB_WC_WITH_IMM; 419 wc.ex.imm_data = wqe->wr.ex.imm_data; 420 /* FALLTHROUGH */ 421 case IB_WR_SEND: 422 ret = qib_get_rwqe(qp, 0); 423 if (ret < 0) 424 goto op_err; 425 if (!ret) 426 goto rnr_nak; 427 break; 428 429 case IB_WR_RDMA_WRITE_WITH_IMM: 430 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) 431 goto inv_err; 432 wc.wc_flags = IB_WC_WITH_IMM; 433 wc.ex.imm_data = wqe->wr.ex.imm_data; 434 ret = qib_get_rwqe(qp, 1); 435 if (ret < 0) 436 goto op_err; 437 if (!ret) 438 goto rnr_nak; 439 /* FALLTHROUGH */ 440 case IB_WR_RDMA_WRITE: 441 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) 442 goto inv_err; 443 if (wqe->length == 0) 444 break; 445 if (unlikely(!rvt_rkey_ok(qp, &qp->r_sge.sge, wqe->length, 446 wqe->rdma_wr.remote_addr, 447 wqe->rdma_wr.rkey, 448 IB_ACCESS_REMOTE_WRITE))) 449 goto acc_err; 450 qp->r_sge.sg_list = NULL; 451 qp->r_sge.num_sge = 1; 452 qp->r_sge.total_len = wqe->length; 453 break; 454 455 case IB_WR_RDMA_READ: 456 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ))) 457 goto inv_err; 458 if (unlikely(!rvt_rkey_ok(qp, &sqp->s_sge.sge, wqe->length, 459 wqe->rdma_wr.remote_addr, 460 wqe->rdma_wr.rkey, 461 IB_ACCESS_REMOTE_READ))) 462 goto acc_err; 463 release = 0; 464 sqp->s_sge.sg_list = NULL; 465 sqp->s_sge.num_sge = 1; 466 qp->r_sge.sge = wqe->sg_list[0]; 467 qp->r_sge.sg_list = wqe->sg_list + 1; 468 qp->r_sge.num_sge = wqe->wr.num_sge; 469 qp->r_sge.total_len = wqe->length; 470 break; 471 472 case IB_WR_ATOMIC_CMP_AND_SWP: 473 case IB_WR_ATOMIC_FETCH_AND_ADD: 474 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) 475 goto inv_err; 476 if (unlikely(!rvt_rkey_ok(qp, &qp->r_sge.sge, sizeof(u64), 477 wqe->atomic_wr.remote_addr, 478 wqe->atomic_wr.rkey, 479 IB_ACCESS_REMOTE_ATOMIC))) 480 goto acc_err; 481 /* Perform atomic OP and save result. */ 482 maddr = (atomic64_t *) qp->r_sge.sge.vaddr; 483 sdata = wqe->atomic_wr.compare_add; 484 *(u64 *) sqp->s_sge.sge.vaddr = 485 (wqe->atomic_wr.wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) ? 486 (u64) atomic64_add_return(sdata, maddr) - sdata : 487 (u64) cmpxchg((u64 *) qp->r_sge.sge.vaddr, 488 sdata, wqe->atomic_wr.swap); 489 rvt_put_mr(qp->r_sge.sge.mr); 490 qp->r_sge.num_sge = 0; 491 goto send_comp; 492 493 default: 494 send_status = IB_WC_LOC_QP_OP_ERR; 495 goto serr; 496 } 497 498 sge = &sqp->s_sge.sge; 499 while (sqp->s_len) { 500 u32 len = sqp->s_len; 501 502 if (len > sge->length) 503 len = sge->length; 504 if (len > sge->sge_length) 505 len = sge->sge_length; 506 BUG_ON(len == 0); 507 qib_copy_sge(&qp->r_sge, sge->vaddr, len, release); 508 sge->vaddr += len; 509 sge->length -= len; 510 sge->sge_length -= len; 511 if (sge->sge_length == 0) { 512 if (!release) 513 rvt_put_mr(sge->mr); 514 if (--sqp->s_sge.num_sge) 515 *sge = *sqp->s_sge.sg_list++; 516 } else if (sge->length == 0 && sge->mr->lkey) { 517 if (++sge->n >= RVT_SEGSZ) { 518 if (++sge->m >= sge->mr->mapsz) 519 break; 520 sge->n = 0; 521 } 522 sge->vaddr = 523 sge->mr->map[sge->m]->segs[sge->n].vaddr; 524 sge->length = 525 sge->mr->map[sge->m]->segs[sge->n].length; 526 } 527 sqp->s_len -= len; 528 } 529 if (release) 530 rvt_put_ss(&qp->r_sge); 531 532 if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags)) 533 goto send_comp; 534 535 if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM) 536 wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; 537 else 538 wc.opcode = IB_WC_RECV; 539 wc.wr_id = qp->r_wr_id; 540 wc.status = IB_WC_SUCCESS; 541 wc.byte_len = wqe->length; 542 wc.qp = &qp->ibqp; 543 wc.src_qp = qp->remote_qpn; 544 wc.slid = rdma_ah_get_dlid(&qp->remote_ah_attr); 545 wc.sl = rdma_ah_get_sl(&qp->remote_ah_attr); 546 wc.port_num = 1; 547 /* Signal completion event if the solicited bit is set. */ 548 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc, 549 wqe->wr.send_flags & IB_SEND_SOLICITED); 550 551 send_comp: 552 spin_lock_irqsave(&sqp->s_lock, flags); 553 ibp->rvp.n_loop_pkts++; 554 flush_send: 555 sqp->s_rnr_retry = sqp->s_rnr_retry_cnt; 556 qib_send_complete(sqp, wqe, send_status); 557 goto again; 558 559 rnr_nak: 560 /* Handle RNR NAK */ 561 if (qp->ibqp.qp_type == IB_QPT_UC) 562 goto send_comp; 563 ibp->rvp.n_rnr_naks++; 564 /* 565 * Note: we don't need the s_lock held since the BUSY flag 566 * makes this single threaded. 567 */ 568 if (sqp->s_rnr_retry == 0) { 569 send_status = IB_WC_RNR_RETRY_EXC_ERR; 570 goto serr; 571 } 572 if (sqp->s_rnr_retry_cnt < 7) 573 sqp->s_rnr_retry--; 574 spin_lock_irqsave(&sqp->s_lock, flags); 575 if (!(ib_rvt_state_ops[sqp->state] & RVT_PROCESS_RECV_OK)) 576 goto clr_busy; 577 rvt_add_rnr_timer(sqp, qp->r_min_rnr_timer << 578 IB_AETH_CREDIT_SHIFT); 579 goto clr_busy; 580 581 op_err: 582 send_status = IB_WC_REM_OP_ERR; 583 wc.status = IB_WC_LOC_QP_OP_ERR; 584 goto err; 585 586 inv_err: 587 send_status = IB_WC_REM_INV_REQ_ERR; 588 wc.status = IB_WC_LOC_QP_OP_ERR; 589 goto err; 590 591 acc_err: 592 send_status = IB_WC_REM_ACCESS_ERR; 593 wc.status = IB_WC_LOC_PROT_ERR; 594 err: 595 /* responder goes to error state */ 596 rvt_rc_error(qp, wc.status); 597 598 serr: 599 spin_lock_irqsave(&sqp->s_lock, flags); 600 qib_send_complete(sqp, wqe, send_status); 601 if (sqp->ibqp.qp_type == IB_QPT_RC) { 602 int lastwqe = rvt_error_qp(sqp, IB_WC_WR_FLUSH_ERR); 603 604 sqp->s_flags &= ~RVT_S_BUSY; 605 spin_unlock_irqrestore(&sqp->s_lock, flags); 606 if (lastwqe) { 607 struct ib_event ev; 608 609 ev.device = sqp->ibqp.device; 610 ev.element.qp = &sqp->ibqp; 611 ev.event = IB_EVENT_QP_LAST_WQE_REACHED; 612 sqp->ibqp.event_handler(&ev, sqp->ibqp.qp_context); 613 } 614 goto done; 615 } 616 clr_busy: 617 sqp->s_flags &= ~RVT_S_BUSY; 618 unlock: 619 spin_unlock_irqrestore(&sqp->s_lock, flags); 620 done: 621 rcu_read_unlock(); 622 } 623 624 /** 625 * qib_make_grh - construct a GRH header 626 * @ibp: a pointer to the IB port 627 * @hdr: a pointer to the GRH header being constructed 628 * @grh: the global route address to send to 629 * @hwords: the number of 32 bit words of header being sent 630 * @nwords: the number of 32 bit words of data being sent 631 * 632 * Return the size of the header in 32 bit words. 633 */ 634 u32 qib_make_grh(struct qib_ibport *ibp, struct ib_grh *hdr, 635 const struct ib_global_route *grh, u32 hwords, u32 nwords) 636 { 637 hdr->version_tclass_flow = 638 cpu_to_be32((IB_GRH_VERSION << IB_GRH_VERSION_SHIFT) | 639 (grh->traffic_class << IB_GRH_TCLASS_SHIFT) | 640 (grh->flow_label << IB_GRH_FLOW_SHIFT)); 641 hdr->paylen = cpu_to_be16((hwords - 2 + nwords + SIZE_OF_CRC) << 2); 642 /* next_hdr is defined by C8-7 in ch. 8.4.1 */ 643 hdr->next_hdr = IB_GRH_NEXT_HDR; 644 hdr->hop_limit = grh->hop_limit; 645 /* The SGID is 32-bit aligned. */ 646 hdr->sgid.global.subnet_prefix = ibp->rvp.gid_prefix; 647 if (!grh->sgid_index) 648 hdr->sgid.global.interface_id = ppd_from_ibp(ibp)->guid; 649 else if (grh->sgid_index < QIB_GUIDS_PER_PORT) 650 hdr->sgid.global.interface_id = ibp->guids[grh->sgid_index - 1]; 651 hdr->dgid = grh->dgid; 652 653 /* GRH header size in 32-bit words. */ 654 return sizeof(struct ib_grh) / sizeof(u32); 655 } 656 657 void qib_make_ruc_header(struct rvt_qp *qp, struct ib_other_headers *ohdr, 658 u32 bth0, u32 bth2) 659 { 660 struct qib_qp_priv *priv = qp->priv; 661 struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); 662 u16 lrh0; 663 u32 nwords; 664 u32 extra_bytes; 665 666 /* Construct the header. */ 667 extra_bytes = -qp->s_cur_size & 3; 668 nwords = (qp->s_cur_size + extra_bytes) >> 2; 669 lrh0 = QIB_LRH_BTH; 670 if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)) { 671 qp->s_hdrwords += 672 qib_make_grh(ibp, &priv->s_hdr->u.l.grh, 673 rdma_ah_read_grh(&qp->remote_ah_attr), 674 qp->s_hdrwords, nwords); 675 lrh0 = QIB_LRH_GRH; 676 } 677 lrh0 |= ibp->sl_to_vl[rdma_ah_get_sl(&qp->remote_ah_attr)] << 12 | 678 rdma_ah_get_sl(&qp->remote_ah_attr) << 4; 679 priv->s_hdr->lrh[0] = cpu_to_be16(lrh0); 680 priv->s_hdr->lrh[1] = 681 cpu_to_be16(rdma_ah_get_dlid(&qp->remote_ah_attr)); 682 priv->s_hdr->lrh[2] = 683 cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC); 684 priv->s_hdr->lrh[3] = 685 cpu_to_be16(ppd_from_ibp(ibp)->lid | 686 rdma_ah_get_path_bits(&qp->remote_ah_attr)); 687 bth0 |= qib_get_pkey(ibp, qp->s_pkey_index); 688 bth0 |= extra_bytes << 20; 689 if (qp->s_mig_state == IB_MIG_MIGRATED) 690 bth0 |= IB_BTH_MIG_REQ; 691 ohdr->bth[0] = cpu_to_be32(bth0); 692 ohdr->bth[1] = cpu_to_be32(qp->remote_qpn); 693 ohdr->bth[2] = cpu_to_be32(bth2); 694 this_cpu_inc(ibp->pmastats->n_unicast_xmit); 695 } 696 697 void _qib_do_send(struct work_struct *work) 698 { 699 struct qib_qp_priv *priv = container_of(work, struct qib_qp_priv, 700 s_work); 701 struct rvt_qp *qp = priv->owner; 702 703 qib_do_send(qp); 704 } 705 706 /** 707 * qib_do_send - perform a send on a QP 708 * @qp: pointer to the QP 709 * 710 * Process entries in the send work queue until credit or queue is 711 * exhausted. Only allow one CPU to send a packet per QP (tasklet). 712 * Otherwise, two threads could send packets out of order. 713 */ 714 void qib_do_send(struct rvt_qp *qp) 715 { 716 struct qib_qp_priv *priv = qp->priv; 717 struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); 718 struct qib_pportdata *ppd = ppd_from_ibp(ibp); 719 int (*make_req)(struct rvt_qp *qp, unsigned long *flags); 720 unsigned long flags; 721 722 if ((qp->ibqp.qp_type == IB_QPT_RC || 723 qp->ibqp.qp_type == IB_QPT_UC) && 724 (rdma_ah_get_dlid(&qp->remote_ah_attr) & 725 ~((1 << ppd->lmc) - 1)) == ppd->lid) { 726 qib_ruc_loopback(qp); 727 return; 728 } 729 730 if (qp->ibqp.qp_type == IB_QPT_RC) 731 make_req = qib_make_rc_req; 732 else if (qp->ibqp.qp_type == IB_QPT_UC) 733 make_req = qib_make_uc_req; 734 else 735 make_req = qib_make_ud_req; 736 737 spin_lock_irqsave(&qp->s_lock, flags); 738 739 /* Return if we are already busy processing a work request. */ 740 if (!qib_send_ok(qp)) { 741 spin_unlock_irqrestore(&qp->s_lock, flags); 742 return; 743 } 744 745 qp->s_flags |= RVT_S_BUSY; 746 747 do { 748 /* Check for a constructed packet to be sent. */ 749 if (qp->s_hdrwords != 0) { 750 spin_unlock_irqrestore(&qp->s_lock, flags); 751 /* 752 * If the packet cannot be sent now, return and 753 * the send tasklet will be woken up later. 754 */ 755 if (qib_verbs_send(qp, priv->s_hdr, qp->s_hdrwords, 756 qp->s_cur_sge, qp->s_cur_size)) 757 return; 758 /* Record that s_hdr is empty. */ 759 qp->s_hdrwords = 0; 760 spin_lock_irqsave(&qp->s_lock, flags); 761 } 762 } while (make_req(qp, &flags)); 763 764 spin_unlock_irqrestore(&qp->s_lock, flags); 765 } 766 767 /* 768 * This should be called with s_lock held. 769 */ 770 void qib_send_complete(struct rvt_qp *qp, struct rvt_swqe *wqe, 771 enum ib_wc_status status) 772 { 773 u32 old_last, last; 774 775 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_OR_FLUSH_SEND)) 776 return; 777 778 last = qp->s_last; 779 old_last = last; 780 if (++last >= qp->s_size) 781 last = 0; 782 qp->s_last = last; 783 /* See post_send() */ 784 barrier(); 785 rvt_put_swqe(wqe); 786 if (qp->ibqp.qp_type == IB_QPT_UD || 787 qp->ibqp.qp_type == IB_QPT_SMI || 788 qp->ibqp.qp_type == IB_QPT_GSI) 789 atomic_dec(&ibah_to_rvtah(wqe->ud_wr.ah)->refcount); 790 791 rvt_qp_swqe_complete(qp, 792 wqe, 793 ib_qib_wc_opcode[wqe->wr.opcode], 794 status); 795 796 if (qp->s_acked == old_last) 797 qp->s_acked = last; 798 if (qp->s_cur == old_last) 799 qp->s_cur = last; 800 if (qp->s_tail == old_last) 801 qp->s_tail = last; 802 if (qp->state == IB_QPS_SQD && last == qp->s_cur) 803 qp->s_draining = 0; 804 } 805