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 36 #include "qib.h" 37 #include "qib_mad.h" 38 39 /* 40 * Convert the AETH RNR timeout code into the number of microseconds. 41 */ 42 const u32 ib_qib_rnr_table[32] = { 43 655360, /* 00: 655.36 */ 44 10, /* 01: .01 */ 45 20, /* 02 .02 */ 46 30, /* 03: .03 */ 47 40, /* 04: .04 */ 48 60, /* 05: .06 */ 49 80, /* 06: .08 */ 50 120, /* 07: .12 */ 51 160, /* 08: .16 */ 52 240, /* 09: .24 */ 53 320, /* 0A: .32 */ 54 480, /* 0B: .48 */ 55 640, /* 0C: .64 */ 56 960, /* 0D: .96 */ 57 1280, /* 0E: 1.28 */ 58 1920, /* 0F: 1.92 */ 59 2560, /* 10: 2.56 */ 60 3840, /* 11: 3.84 */ 61 5120, /* 12: 5.12 */ 62 7680, /* 13: 7.68 */ 63 10240, /* 14: 10.24 */ 64 15360, /* 15: 15.36 */ 65 20480, /* 16: 20.48 */ 66 30720, /* 17: 30.72 */ 67 40960, /* 18: 40.96 */ 68 61440, /* 19: 61.44 */ 69 81920, /* 1A: 81.92 */ 70 122880, /* 1B: 122.88 */ 71 163840, /* 1C: 163.84 */ 72 245760, /* 1D: 245.76 */ 73 327680, /* 1E: 327.68 */ 74 491520 /* 1F: 491.52 */ 75 }; 76 77 /* 78 * Validate a RWQE and fill in the SGE state. 79 * Return 1 if OK. 80 */ 81 static int qib_init_sge(struct qib_qp *qp, struct qib_rwqe *wqe) 82 { 83 int i, j, ret; 84 struct ib_wc wc; 85 struct qib_lkey_table *rkt; 86 struct qib_pd *pd; 87 struct qib_sge_state *ss; 88 89 rkt = &to_idev(qp->ibqp.device)->lk_table; 90 pd = to_ipd(qp->ibqp.srq ? qp->ibqp.srq->pd : qp->ibqp.pd); 91 ss = &qp->r_sge; 92 ss->sg_list = qp->r_sg_list; 93 qp->r_len = 0; 94 for (i = j = 0; i < wqe->num_sge; i++) { 95 if (wqe->sg_list[i].length == 0) 96 continue; 97 /* Check LKEY */ 98 if (!qib_lkey_ok(rkt, pd, j ? &ss->sg_list[j - 1] : &ss->sge, 99 &wqe->sg_list[i], IB_ACCESS_LOCAL_WRITE)) 100 goto bad_lkey; 101 qp->r_len += wqe->sg_list[i].length; 102 j++; 103 } 104 ss->num_sge = j; 105 ss->total_len = qp->r_len; 106 ret = 1; 107 goto bail; 108 109 bad_lkey: 110 while (j) { 111 struct qib_sge *sge = --j ? &ss->sg_list[j - 1] : &ss->sge; 112 113 qib_put_mr(sge->mr); 114 } 115 ss->num_sge = 0; 116 memset(&wc, 0, sizeof(wc)); 117 wc.wr_id = wqe->wr_id; 118 wc.status = IB_WC_LOC_PROT_ERR; 119 wc.opcode = IB_WC_RECV; 120 wc.qp = &qp->ibqp; 121 /* Signal solicited completion event. */ 122 qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1); 123 ret = 0; 124 bail: 125 return ret; 126 } 127 128 /** 129 * qib_get_rwqe - copy the next RWQE into the QP's RWQE 130 * @qp: the QP 131 * @wr_id_only: update qp->r_wr_id only, not qp->r_sge 132 * 133 * Return -1 if there is a local error, 0 if no RWQE is available, 134 * otherwise return 1. 135 * 136 * Can be called from interrupt level. 137 */ 138 int qib_get_rwqe(struct qib_qp *qp, int wr_id_only) 139 { 140 unsigned long flags; 141 struct qib_rq *rq; 142 struct qib_rwq *wq; 143 struct qib_srq *srq; 144 struct qib_rwqe *wqe; 145 void (*handler)(struct ib_event *, void *); 146 u32 tail; 147 int ret; 148 149 if (qp->ibqp.srq) { 150 srq = to_isrq(qp->ibqp.srq); 151 handler = srq->ibsrq.event_handler; 152 rq = &srq->rq; 153 } else { 154 srq = NULL; 155 handler = NULL; 156 rq = &qp->r_rq; 157 } 158 159 spin_lock_irqsave(&rq->lock, flags); 160 if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK)) { 161 ret = 0; 162 goto unlock; 163 } 164 165 wq = rq->wq; 166 tail = wq->tail; 167 /* Validate tail before using it since it is user writable. */ 168 if (tail >= rq->size) 169 tail = 0; 170 if (unlikely(tail == wq->head)) { 171 ret = 0; 172 goto unlock; 173 } 174 /* Make sure entry is read after head index is read. */ 175 smp_rmb(); 176 wqe = get_rwqe_ptr(rq, tail); 177 /* 178 * Even though we update the tail index in memory, the verbs 179 * consumer is not supposed to post more entries until a 180 * completion is generated. 181 */ 182 if (++tail >= rq->size) 183 tail = 0; 184 wq->tail = tail; 185 if (!wr_id_only && !qib_init_sge(qp, wqe)) { 186 ret = -1; 187 goto unlock; 188 } 189 qp->r_wr_id = wqe->wr_id; 190 191 ret = 1; 192 set_bit(QIB_R_WRID_VALID, &qp->r_aflags); 193 if (handler) { 194 u32 n; 195 196 /* 197 * Validate head pointer value and compute 198 * the number of remaining WQEs. 199 */ 200 n = wq->head; 201 if (n >= rq->size) 202 n = 0; 203 if (n < tail) 204 n += rq->size - tail; 205 else 206 n -= tail; 207 if (n < srq->limit) { 208 struct ib_event ev; 209 210 srq->limit = 0; 211 spin_unlock_irqrestore(&rq->lock, flags); 212 ev.device = qp->ibqp.device; 213 ev.element.srq = qp->ibqp.srq; 214 ev.event = IB_EVENT_SRQ_LIMIT_REACHED; 215 handler(&ev, srq->ibsrq.srq_context); 216 goto bail; 217 } 218 } 219 unlock: 220 spin_unlock_irqrestore(&rq->lock, flags); 221 bail: 222 return ret; 223 } 224 225 /* 226 * Switch to alternate path. 227 * The QP s_lock should be held and interrupts disabled. 228 */ 229 void qib_migrate_qp(struct qib_qp *qp) 230 { 231 struct ib_event ev; 232 233 qp->s_mig_state = IB_MIG_MIGRATED; 234 qp->remote_ah_attr = qp->alt_ah_attr; 235 qp->port_num = qp->alt_ah_attr.port_num; 236 qp->s_pkey_index = qp->s_alt_pkey_index; 237 238 ev.device = qp->ibqp.device; 239 ev.element.qp = &qp->ibqp; 240 ev.event = IB_EVENT_PATH_MIG; 241 qp->ibqp.event_handler(&ev, qp->ibqp.qp_context); 242 } 243 244 static __be64 get_sguid(struct qib_ibport *ibp, unsigned index) 245 { 246 if (!index) { 247 struct qib_pportdata *ppd = ppd_from_ibp(ibp); 248 249 return ppd->guid; 250 } else 251 return ibp->guids[index - 1]; 252 } 253 254 static int gid_ok(union ib_gid *gid, __be64 gid_prefix, __be64 id) 255 { 256 return (gid->global.interface_id == id && 257 (gid->global.subnet_prefix == gid_prefix || 258 gid->global.subnet_prefix == IB_DEFAULT_GID_PREFIX)); 259 } 260 261 /* 262 * 263 * This should be called with the QP r_lock held. 264 * 265 * The s_lock will be acquired around the qib_migrate_qp() call. 266 */ 267 int qib_ruc_check_hdr(struct qib_ibport *ibp, struct qib_ib_header *hdr, 268 int has_grh, struct qib_qp *qp, u32 bth0) 269 { 270 __be64 guid; 271 unsigned long flags; 272 273 if (qp->s_mig_state == IB_MIG_ARMED && (bth0 & IB_BTH_MIG_REQ)) { 274 if (!has_grh) { 275 if (qp->alt_ah_attr.ah_flags & IB_AH_GRH) 276 goto err; 277 } else { 278 if (!(qp->alt_ah_attr.ah_flags & IB_AH_GRH)) 279 goto err; 280 guid = get_sguid(ibp, qp->alt_ah_attr.grh.sgid_index); 281 if (!gid_ok(&hdr->u.l.grh.dgid, ibp->gid_prefix, guid)) 282 goto err; 283 if (!gid_ok(&hdr->u.l.grh.sgid, 284 qp->alt_ah_attr.grh.dgid.global.subnet_prefix, 285 qp->alt_ah_attr.grh.dgid.global.interface_id)) 286 goto err; 287 } 288 if (!qib_pkey_ok((u16)bth0, 289 qib_get_pkey(ibp, qp->s_alt_pkey_index))) { 290 qib_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_PKEY, 291 (u16)bth0, 292 (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF, 293 0, qp->ibqp.qp_num, 294 hdr->lrh[3], hdr->lrh[1]); 295 goto err; 296 } 297 /* Validate the SLID. See Ch. 9.6.1.5 and 17.2.8 */ 298 if (be16_to_cpu(hdr->lrh[3]) != qp->alt_ah_attr.dlid || 299 ppd_from_ibp(ibp)->port != qp->alt_ah_attr.port_num) 300 goto err; 301 spin_lock_irqsave(&qp->s_lock, flags); 302 qib_migrate_qp(qp); 303 spin_unlock_irqrestore(&qp->s_lock, flags); 304 } else { 305 if (!has_grh) { 306 if (qp->remote_ah_attr.ah_flags & IB_AH_GRH) 307 goto err; 308 } else { 309 if (!(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) 310 goto err; 311 guid = get_sguid(ibp, 312 qp->remote_ah_attr.grh.sgid_index); 313 if (!gid_ok(&hdr->u.l.grh.dgid, ibp->gid_prefix, guid)) 314 goto err; 315 if (!gid_ok(&hdr->u.l.grh.sgid, 316 qp->remote_ah_attr.grh.dgid.global.subnet_prefix, 317 qp->remote_ah_attr.grh.dgid.global.interface_id)) 318 goto err; 319 } 320 if (!qib_pkey_ok((u16)bth0, 321 qib_get_pkey(ibp, qp->s_pkey_index))) { 322 qib_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_PKEY, 323 (u16)bth0, 324 (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF, 325 0, qp->ibqp.qp_num, 326 hdr->lrh[3], hdr->lrh[1]); 327 goto err; 328 } 329 /* Validate the SLID. See Ch. 9.6.1.5 */ 330 if (be16_to_cpu(hdr->lrh[3]) != qp->remote_ah_attr.dlid || 331 ppd_from_ibp(ibp)->port != qp->port_num) 332 goto err; 333 if (qp->s_mig_state == IB_MIG_REARM && 334 !(bth0 & IB_BTH_MIG_REQ)) 335 qp->s_mig_state = IB_MIG_ARMED; 336 } 337 338 return 0; 339 340 err: 341 return 1; 342 } 343 344 /** 345 * qib_ruc_loopback - handle UC and RC lookback requests 346 * @sqp: the sending QP 347 * 348 * This is called from qib_do_send() to 349 * forward a WQE addressed to the same HCA. 350 * Note that although we are single threaded due to the tasklet, we still 351 * have to protect against post_send(). We don't have to worry about 352 * receive interrupts since this is a connected protocol and all packets 353 * will pass through here. 354 */ 355 static void qib_ruc_loopback(struct qib_qp *sqp) 356 { 357 struct qib_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num); 358 struct qib_qp *qp; 359 struct qib_swqe *wqe; 360 struct qib_sge *sge; 361 unsigned long flags; 362 struct ib_wc wc; 363 u64 sdata; 364 atomic64_t *maddr; 365 enum ib_wc_status send_status; 366 int release; 367 int ret; 368 369 /* 370 * Note that we check the responder QP state after 371 * checking the requester's state. 372 */ 373 qp = qib_lookup_qpn(ibp, sqp->remote_qpn); 374 375 spin_lock_irqsave(&sqp->s_lock, flags); 376 377 /* Return if we are already busy processing a work request. */ 378 if ((sqp->s_flags & (QIB_S_BUSY | QIB_S_ANY_WAIT)) || 379 !(ib_qib_state_ops[sqp->state] & QIB_PROCESS_OR_FLUSH_SEND)) 380 goto unlock; 381 382 sqp->s_flags |= QIB_S_BUSY; 383 384 again: 385 if (sqp->s_last == sqp->s_head) 386 goto clr_busy; 387 wqe = get_swqe_ptr(sqp, sqp->s_last); 388 389 /* Return if it is not OK to start a new work reqeust. */ 390 if (!(ib_qib_state_ops[sqp->state] & QIB_PROCESS_NEXT_SEND_OK)) { 391 if (!(ib_qib_state_ops[sqp->state] & QIB_FLUSH_SEND)) 392 goto clr_busy; 393 /* We are in the error state, flush the work request. */ 394 send_status = IB_WC_WR_FLUSH_ERR; 395 goto flush_send; 396 } 397 398 /* 399 * We can rely on the entry not changing without the s_lock 400 * being held until we update s_last. 401 * We increment s_cur to indicate s_last is in progress. 402 */ 403 if (sqp->s_last == sqp->s_cur) { 404 if (++sqp->s_cur >= sqp->s_size) 405 sqp->s_cur = 0; 406 } 407 spin_unlock_irqrestore(&sqp->s_lock, flags); 408 409 if (!qp || !(ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK) || 410 qp->ibqp.qp_type != sqp->ibqp.qp_type) { 411 ibp->n_pkt_drops++; 412 /* 413 * For RC, the requester would timeout and retry so 414 * shortcut the timeouts and just signal too many retries. 415 */ 416 if (sqp->ibqp.qp_type == IB_QPT_RC) 417 send_status = IB_WC_RETRY_EXC_ERR; 418 else 419 send_status = IB_WC_SUCCESS; 420 goto serr; 421 } 422 423 memset(&wc, 0, sizeof wc); 424 send_status = IB_WC_SUCCESS; 425 426 release = 1; 427 sqp->s_sge.sge = wqe->sg_list[0]; 428 sqp->s_sge.sg_list = wqe->sg_list + 1; 429 sqp->s_sge.num_sge = wqe->wr.num_sge; 430 sqp->s_len = wqe->length; 431 switch (wqe->wr.opcode) { 432 case IB_WR_SEND_WITH_IMM: 433 wc.wc_flags = IB_WC_WITH_IMM; 434 wc.ex.imm_data = wqe->wr.ex.imm_data; 435 /* FALLTHROUGH */ 436 case IB_WR_SEND: 437 ret = qib_get_rwqe(qp, 0); 438 if (ret < 0) 439 goto op_err; 440 if (!ret) 441 goto rnr_nak; 442 break; 443 444 case IB_WR_RDMA_WRITE_WITH_IMM: 445 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) 446 goto inv_err; 447 wc.wc_flags = IB_WC_WITH_IMM; 448 wc.ex.imm_data = wqe->wr.ex.imm_data; 449 ret = qib_get_rwqe(qp, 1); 450 if (ret < 0) 451 goto op_err; 452 if (!ret) 453 goto rnr_nak; 454 /* FALLTHROUGH */ 455 case IB_WR_RDMA_WRITE: 456 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) 457 goto inv_err; 458 if (wqe->length == 0) 459 break; 460 if (unlikely(!qib_rkey_ok(qp, &qp->r_sge.sge, wqe->length, 461 wqe->wr.wr.rdma.remote_addr, 462 wqe->wr.wr.rdma.rkey, 463 IB_ACCESS_REMOTE_WRITE))) 464 goto acc_err; 465 qp->r_sge.sg_list = NULL; 466 qp->r_sge.num_sge = 1; 467 qp->r_sge.total_len = wqe->length; 468 break; 469 470 case IB_WR_RDMA_READ: 471 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ))) 472 goto inv_err; 473 if (unlikely(!qib_rkey_ok(qp, &sqp->s_sge.sge, wqe->length, 474 wqe->wr.wr.rdma.remote_addr, 475 wqe->wr.wr.rdma.rkey, 476 IB_ACCESS_REMOTE_READ))) 477 goto acc_err; 478 release = 0; 479 sqp->s_sge.sg_list = NULL; 480 sqp->s_sge.num_sge = 1; 481 qp->r_sge.sge = wqe->sg_list[0]; 482 qp->r_sge.sg_list = wqe->sg_list + 1; 483 qp->r_sge.num_sge = wqe->wr.num_sge; 484 qp->r_sge.total_len = wqe->length; 485 break; 486 487 case IB_WR_ATOMIC_CMP_AND_SWP: 488 case IB_WR_ATOMIC_FETCH_AND_ADD: 489 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) 490 goto inv_err; 491 if (unlikely(!qib_rkey_ok(qp, &qp->r_sge.sge, sizeof(u64), 492 wqe->wr.wr.atomic.remote_addr, 493 wqe->wr.wr.atomic.rkey, 494 IB_ACCESS_REMOTE_ATOMIC))) 495 goto acc_err; 496 /* Perform atomic OP and save result. */ 497 maddr = (atomic64_t *) qp->r_sge.sge.vaddr; 498 sdata = wqe->wr.wr.atomic.compare_add; 499 *(u64 *) sqp->s_sge.sge.vaddr = 500 (wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) ? 501 (u64) atomic64_add_return(sdata, maddr) - sdata : 502 (u64) cmpxchg((u64 *) qp->r_sge.sge.vaddr, 503 sdata, wqe->wr.wr.atomic.swap); 504 qib_put_mr(qp->r_sge.sge.mr); 505 qp->r_sge.num_sge = 0; 506 goto send_comp; 507 508 default: 509 send_status = IB_WC_LOC_QP_OP_ERR; 510 goto serr; 511 } 512 513 sge = &sqp->s_sge.sge; 514 while (sqp->s_len) { 515 u32 len = sqp->s_len; 516 517 if (len > sge->length) 518 len = sge->length; 519 if (len > sge->sge_length) 520 len = sge->sge_length; 521 BUG_ON(len == 0); 522 qib_copy_sge(&qp->r_sge, sge->vaddr, len, release); 523 sge->vaddr += len; 524 sge->length -= len; 525 sge->sge_length -= len; 526 if (sge->sge_length == 0) { 527 if (!release) 528 qib_put_mr(sge->mr); 529 if (--sqp->s_sge.num_sge) 530 *sge = *sqp->s_sge.sg_list++; 531 } else if (sge->length == 0 && sge->mr->lkey) { 532 if (++sge->n >= QIB_SEGSZ) { 533 if (++sge->m >= sge->mr->mapsz) 534 break; 535 sge->n = 0; 536 } 537 sge->vaddr = 538 sge->mr->map[sge->m]->segs[sge->n].vaddr; 539 sge->length = 540 sge->mr->map[sge->m]->segs[sge->n].length; 541 } 542 sqp->s_len -= len; 543 } 544 if (release) 545 qib_put_ss(&qp->r_sge); 546 547 if (!test_and_clear_bit(QIB_R_WRID_VALID, &qp->r_aflags)) 548 goto send_comp; 549 550 if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM) 551 wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; 552 else 553 wc.opcode = IB_WC_RECV; 554 wc.wr_id = qp->r_wr_id; 555 wc.status = IB_WC_SUCCESS; 556 wc.byte_len = wqe->length; 557 wc.qp = &qp->ibqp; 558 wc.src_qp = qp->remote_qpn; 559 wc.slid = qp->remote_ah_attr.dlid; 560 wc.sl = qp->remote_ah_attr.sl; 561 wc.port_num = 1; 562 /* Signal completion event if the solicited bit is set. */ 563 qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 564 wqe->wr.send_flags & IB_SEND_SOLICITED); 565 566 send_comp: 567 spin_lock_irqsave(&sqp->s_lock, flags); 568 ibp->n_loop_pkts++; 569 flush_send: 570 sqp->s_rnr_retry = sqp->s_rnr_retry_cnt; 571 qib_send_complete(sqp, wqe, send_status); 572 goto again; 573 574 rnr_nak: 575 /* Handle RNR NAK */ 576 if (qp->ibqp.qp_type == IB_QPT_UC) 577 goto send_comp; 578 ibp->n_rnr_naks++; 579 /* 580 * Note: we don't need the s_lock held since the BUSY flag 581 * makes this single threaded. 582 */ 583 if (sqp->s_rnr_retry == 0) { 584 send_status = IB_WC_RNR_RETRY_EXC_ERR; 585 goto serr; 586 } 587 if (sqp->s_rnr_retry_cnt < 7) 588 sqp->s_rnr_retry--; 589 spin_lock_irqsave(&sqp->s_lock, flags); 590 if (!(ib_qib_state_ops[sqp->state] & QIB_PROCESS_RECV_OK)) 591 goto clr_busy; 592 sqp->s_flags |= QIB_S_WAIT_RNR; 593 sqp->s_timer.function = qib_rc_rnr_retry; 594 sqp->s_timer.expires = jiffies + 595 usecs_to_jiffies(ib_qib_rnr_table[qp->r_min_rnr_timer]); 596 add_timer(&sqp->s_timer); 597 goto clr_busy; 598 599 op_err: 600 send_status = IB_WC_REM_OP_ERR; 601 wc.status = IB_WC_LOC_QP_OP_ERR; 602 goto err; 603 604 inv_err: 605 send_status = IB_WC_REM_INV_REQ_ERR; 606 wc.status = IB_WC_LOC_QP_OP_ERR; 607 goto err; 608 609 acc_err: 610 send_status = IB_WC_REM_ACCESS_ERR; 611 wc.status = IB_WC_LOC_PROT_ERR; 612 err: 613 /* responder goes to error state */ 614 qib_rc_error(qp, wc.status); 615 616 serr: 617 spin_lock_irqsave(&sqp->s_lock, flags); 618 qib_send_complete(sqp, wqe, send_status); 619 if (sqp->ibqp.qp_type == IB_QPT_RC) { 620 int lastwqe = qib_error_qp(sqp, IB_WC_WR_FLUSH_ERR); 621 622 sqp->s_flags &= ~QIB_S_BUSY; 623 spin_unlock_irqrestore(&sqp->s_lock, flags); 624 if (lastwqe) { 625 struct ib_event ev; 626 627 ev.device = sqp->ibqp.device; 628 ev.element.qp = &sqp->ibqp; 629 ev.event = IB_EVENT_QP_LAST_WQE_REACHED; 630 sqp->ibqp.event_handler(&ev, sqp->ibqp.qp_context); 631 } 632 goto done; 633 } 634 clr_busy: 635 sqp->s_flags &= ~QIB_S_BUSY; 636 unlock: 637 spin_unlock_irqrestore(&sqp->s_lock, flags); 638 done: 639 if (qp && atomic_dec_and_test(&qp->refcount)) 640 wake_up(&qp->wait); 641 } 642 643 /** 644 * qib_make_grh - construct a GRH header 645 * @ibp: a pointer to the IB port 646 * @hdr: a pointer to the GRH header being constructed 647 * @grh: the global route address to send to 648 * @hwords: the number of 32 bit words of header being sent 649 * @nwords: the number of 32 bit words of data being sent 650 * 651 * Return the size of the header in 32 bit words. 652 */ 653 u32 qib_make_grh(struct qib_ibport *ibp, struct ib_grh *hdr, 654 struct ib_global_route *grh, u32 hwords, u32 nwords) 655 { 656 hdr->version_tclass_flow = 657 cpu_to_be32((IB_GRH_VERSION << IB_GRH_VERSION_SHIFT) | 658 (grh->traffic_class << IB_GRH_TCLASS_SHIFT) | 659 (grh->flow_label << IB_GRH_FLOW_SHIFT)); 660 hdr->paylen = cpu_to_be16((hwords - 2 + nwords + SIZE_OF_CRC) << 2); 661 /* next_hdr is defined by C8-7 in ch. 8.4.1 */ 662 hdr->next_hdr = IB_GRH_NEXT_HDR; 663 hdr->hop_limit = grh->hop_limit; 664 /* The SGID is 32-bit aligned. */ 665 hdr->sgid.global.subnet_prefix = ibp->gid_prefix; 666 hdr->sgid.global.interface_id = grh->sgid_index ? 667 ibp->guids[grh->sgid_index - 1] : ppd_from_ibp(ibp)->guid; 668 hdr->dgid = grh->dgid; 669 670 /* GRH header size in 32-bit words. */ 671 return sizeof(struct ib_grh) / sizeof(u32); 672 } 673 674 void qib_make_ruc_header(struct qib_qp *qp, struct qib_other_headers *ohdr, 675 u32 bth0, u32 bth2) 676 { 677 struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); 678 u16 lrh0; 679 u32 nwords; 680 u32 extra_bytes; 681 682 /* Construct the header. */ 683 extra_bytes = -qp->s_cur_size & 3; 684 nwords = (qp->s_cur_size + extra_bytes) >> 2; 685 lrh0 = QIB_LRH_BTH; 686 if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) { 687 qp->s_hdrwords += qib_make_grh(ibp, &qp->s_hdr->u.l.grh, 688 &qp->remote_ah_attr.grh, 689 qp->s_hdrwords, nwords); 690 lrh0 = QIB_LRH_GRH; 691 } 692 lrh0 |= ibp->sl_to_vl[qp->remote_ah_attr.sl] << 12 | 693 qp->remote_ah_attr.sl << 4; 694 qp->s_hdr->lrh[0] = cpu_to_be16(lrh0); 695 qp->s_hdr->lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid); 696 qp->s_hdr->lrh[2] = cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC); 697 qp->s_hdr->lrh[3] = cpu_to_be16(ppd_from_ibp(ibp)->lid | 698 qp->remote_ah_attr.src_path_bits); 699 bth0 |= qib_get_pkey(ibp, qp->s_pkey_index); 700 bth0 |= extra_bytes << 20; 701 if (qp->s_mig_state == IB_MIG_MIGRATED) 702 bth0 |= IB_BTH_MIG_REQ; 703 ohdr->bth[0] = cpu_to_be32(bth0); 704 ohdr->bth[1] = cpu_to_be32(qp->remote_qpn); 705 ohdr->bth[2] = cpu_to_be32(bth2); 706 } 707 708 /** 709 * qib_do_send - perform a send on a QP 710 * @work: contains a pointer to the QP 711 * 712 * Process entries in the send work queue until credit or queue is 713 * exhausted. Only allow one CPU to send a packet per QP (tasklet). 714 * Otherwise, two threads could send packets out of order. 715 */ 716 void qib_do_send(struct work_struct *work) 717 { 718 struct qib_qp *qp = container_of(work, struct qib_qp, s_work); 719 struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); 720 struct qib_pportdata *ppd = ppd_from_ibp(ibp); 721 int (*make_req)(struct qib_qp *qp); 722 unsigned long flags; 723 724 if ((qp->ibqp.qp_type == IB_QPT_RC || 725 qp->ibqp.qp_type == IB_QPT_UC) && 726 (qp->remote_ah_attr.dlid & ~((1 << ppd->lmc) - 1)) == ppd->lid) { 727 qib_ruc_loopback(qp); 728 return; 729 } 730 731 if (qp->ibqp.qp_type == IB_QPT_RC) 732 make_req = qib_make_rc_req; 733 else if (qp->ibqp.qp_type == IB_QPT_UC) 734 make_req = qib_make_uc_req; 735 else 736 make_req = qib_make_ud_req; 737 738 spin_lock_irqsave(&qp->s_lock, flags); 739 740 /* Return if we are already busy processing a work request. */ 741 if (!qib_send_ok(qp)) { 742 spin_unlock_irqrestore(&qp->s_lock, flags); 743 return; 744 } 745 746 qp->s_flags |= QIB_S_BUSY; 747 748 spin_unlock_irqrestore(&qp->s_lock, flags); 749 750 do { 751 /* Check for a constructed packet to be sent. */ 752 if (qp->s_hdrwords != 0) { 753 /* 754 * If the packet cannot be sent now, return and 755 * the send tasklet will be woken up later. 756 */ 757 if (qib_verbs_send(qp, qp->s_hdr, qp->s_hdrwords, 758 qp->s_cur_sge, qp->s_cur_size)) 759 break; 760 /* Record that s_hdr is empty. */ 761 qp->s_hdrwords = 0; 762 } 763 } while (make_req(qp)); 764 } 765 766 /* 767 * This should be called with s_lock held. 768 */ 769 void qib_send_complete(struct qib_qp *qp, struct qib_swqe *wqe, 770 enum ib_wc_status status) 771 { 772 u32 old_last, last; 773 unsigned i; 774 775 if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_OR_FLUSH_SEND)) 776 return; 777 778 for (i = 0; i < wqe->wr.num_sge; i++) { 779 struct qib_sge *sge = &wqe->sg_list[i]; 780 781 qib_put_mr(sge->mr); 782 } 783 if (qp->ibqp.qp_type == IB_QPT_UD || 784 qp->ibqp.qp_type == IB_QPT_SMI || 785 qp->ibqp.qp_type == IB_QPT_GSI) 786 atomic_dec(&to_iah(wqe->wr.wr.ud.ah)->refcount); 787 788 /* See ch. 11.2.4.1 and 10.7.3.1 */ 789 if (!(qp->s_flags & QIB_S_SIGNAL_REQ_WR) || 790 (wqe->wr.send_flags & IB_SEND_SIGNALED) || 791 status != IB_WC_SUCCESS) { 792 struct ib_wc wc; 793 794 memset(&wc, 0, sizeof wc); 795 wc.wr_id = wqe->wr.wr_id; 796 wc.status = status; 797 wc.opcode = ib_qib_wc_opcode[wqe->wr.opcode]; 798 wc.qp = &qp->ibqp; 799 if (status == IB_WC_SUCCESS) 800 wc.byte_len = wqe->length; 801 qib_cq_enter(to_icq(qp->ibqp.send_cq), &wc, 802 status != IB_WC_SUCCESS); 803 } 804 805 last = qp->s_last; 806 old_last = last; 807 if (++last >= qp->s_size) 808 last = 0; 809 qp->s_last = last; 810 if (qp->s_acked == old_last) 811 qp->s_acked = last; 812 if (qp->s_cur == old_last) 813 qp->s_cur = last; 814 if (qp->s_tail == old_last) 815 qp->s_tail = last; 816 if (qp->state == IB_QPS_SQD && last == qp->s_cur) 817 qp->s_draining = 0; 818 } 819