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 * Convert the AETH RNR timeout code into the number of microseconds. 42 */ 43 const u32 ib_qib_rnr_table[32] = { 44 655360, /* 00: 655.36 */ 45 10, /* 01: .01 */ 46 20, /* 02 .02 */ 47 30, /* 03: .03 */ 48 40, /* 04: .04 */ 49 60, /* 05: .06 */ 50 80, /* 06: .08 */ 51 120, /* 07: .12 */ 52 160, /* 08: .16 */ 53 240, /* 09: .24 */ 54 320, /* 0A: .32 */ 55 480, /* 0B: .48 */ 56 640, /* 0C: .64 */ 57 960, /* 0D: .96 */ 58 1280, /* 0E: 1.28 */ 59 1920, /* 0F: 1.92 */ 60 2560, /* 10: 2.56 */ 61 3840, /* 11: 3.84 */ 62 5120, /* 12: 5.12 */ 63 7680, /* 13: 7.68 */ 64 10240, /* 14: 10.24 */ 65 15360, /* 15: 15.36 */ 66 20480, /* 16: 20.48 */ 67 30720, /* 17: 30.72 */ 68 40960, /* 18: 40.96 */ 69 61440, /* 19: 61.44 */ 70 81920, /* 1A: 81.92 */ 71 122880, /* 1B: 122.88 */ 72 163840, /* 1C: 163.84 */ 73 245760, /* 1D: 245.76 */ 74 327680, /* 1E: 327.68 */ 75 491520 /* 1F: 491.52 */ 76 }; 77 78 /* 79 * Validate a RWQE and fill in the SGE state. 80 * Return 1 if OK. 81 */ 82 static int qib_init_sge(struct qib_qp *qp, struct qib_rwqe *wqe) 83 { 84 int i, j, ret; 85 struct ib_wc wc; 86 struct qib_lkey_table *rkt; 87 struct qib_pd *pd; 88 struct qib_sge_state *ss; 89 90 rkt = &to_idev(qp->ibqp.device)->lk_table; 91 pd = to_ipd(qp->ibqp.srq ? qp->ibqp.srq->pd : qp->ibqp.pd); 92 ss = &qp->r_sge; 93 ss->sg_list = qp->r_sg_list; 94 qp->r_len = 0; 95 for (i = j = 0; i < wqe->num_sge; i++) { 96 if (wqe->sg_list[i].length == 0) 97 continue; 98 /* Check LKEY */ 99 if (!qib_lkey_ok(rkt, pd, j ? &ss->sg_list[j - 1] : &ss->sge, 100 &wqe->sg_list[i], IB_ACCESS_LOCAL_WRITE)) 101 goto bad_lkey; 102 qp->r_len += wqe->sg_list[i].length; 103 j++; 104 } 105 ss->num_sge = j; 106 ss->total_len = qp->r_len; 107 ret = 1; 108 goto bail; 109 110 bad_lkey: 111 while (j) { 112 struct qib_sge *sge = --j ? &ss->sg_list[j - 1] : &ss->sge; 113 114 qib_put_mr(sge->mr); 115 } 116 ss->num_sge = 0; 117 memset(&wc, 0, sizeof(wc)); 118 wc.wr_id = wqe->wr_id; 119 wc.status = IB_WC_LOC_PROT_ERR; 120 wc.opcode = IB_WC_RECV; 121 wc.qp = &qp->ibqp; 122 /* Signal solicited completion event. */ 123 qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1); 124 ret = 0; 125 bail: 126 return ret; 127 } 128 129 /** 130 * qib_get_rwqe - copy the next RWQE into the QP's RWQE 131 * @qp: the QP 132 * @wr_id_only: update qp->r_wr_id only, not qp->r_sge 133 * 134 * Return -1 if there is a local error, 0 if no RWQE is available, 135 * otherwise return 1. 136 * 137 * Can be called from interrupt level. 138 */ 139 int qib_get_rwqe(struct qib_qp *qp, int wr_id_only) 140 { 141 unsigned long flags; 142 struct qib_rq *rq; 143 struct qib_rwq *wq; 144 struct qib_srq *srq; 145 struct qib_rwqe *wqe; 146 void (*handler)(struct ib_event *, void *); 147 u32 tail; 148 int ret; 149 150 if (qp->ibqp.srq) { 151 srq = to_isrq(qp->ibqp.srq); 152 handler = srq->ibsrq.event_handler; 153 rq = &srq->rq; 154 } else { 155 srq = NULL; 156 handler = NULL; 157 rq = &qp->r_rq; 158 } 159 160 spin_lock_irqsave(&rq->lock, flags); 161 if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK)) { 162 ret = 0; 163 goto unlock; 164 } 165 166 wq = rq->wq; 167 tail = wq->tail; 168 /* Validate tail before using it since it is user writable. */ 169 if (tail >= rq->size) 170 tail = 0; 171 if (unlikely(tail == wq->head)) { 172 ret = 0; 173 goto unlock; 174 } 175 /* Make sure entry is read after head index is read. */ 176 smp_rmb(); 177 wqe = get_rwqe_ptr(rq, tail); 178 /* 179 * Even though we update the tail index in memory, the verbs 180 * consumer is not supposed to post more entries until a 181 * completion is generated. 182 */ 183 if (++tail >= rq->size) 184 tail = 0; 185 wq->tail = tail; 186 if (!wr_id_only && !qib_init_sge(qp, wqe)) { 187 ret = -1; 188 goto unlock; 189 } 190 qp->r_wr_id = wqe->wr_id; 191 192 ret = 1; 193 set_bit(QIB_R_WRID_VALID, &qp->r_aflags); 194 if (handler) { 195 u32 n; 196 197 /* 198 * Validate head pointer value and compute 199 * the number of remaining WQEs. 200 */ 201 n = wq->head; 202 if (n >= rq->size) 203 n = 0; 204 if (n < tail) 205 n += rq->size - tail; 206 else 207 n -= tail; 208 if (n < srq->limit) { 209 struct ib_event ev; 210 211 srq->limit = 0; 212 spin_unlock_irqrestore(&rq->lock, flags); 213 ev.device = qp->ibqp.device; 214 ev.element.srq = qp->ibqp.srq; 215 ev.event = IB_EVENT_SRQ_LIMIT_REACHED; 216 handler(&ev, srq->ibsrq.srq_context); 217 goto bail; 218 } 219 } 220 unlock: 221 spin_unlock_irqrestore(&rq->lock, flags); 222 bail: 223 return ret; 224 } 225 226 /* 227 * Switch to alternate path. 228 * The QP s_lock should be held and interrupts disabled. 229 */ 230 void qib_migrate_qp(struct qib_qp *qp) 231 { 232 struct ib_event ev; 233 234 qp->s_mig_state = IB_MIG_MIGRATED; 235 qp->remote_ah_attr = qp->alt_ah_attr; 236 qp->port_num = qp->alt_ah_attr.port_num; 237 qp->s_pkey_index = qp->s_alt_pkey_index; 238 239 ev.device = qp->ibqp.device; 240 ev.element.qp = &qp->ibqp; 241 ev.event = IB_EVENT_PATH_MIG; 242 qp->ibqp.event_handler(&ev, qp->ibqp.qp_context); 243 } 244 245 static __be64 get_sguid(struct qib_ibport *ibp, unsigned index) 246 { 247 if (!index) { 248 struct qib_pportdata *ppd = ppd_from_ibp(ibp); 249 250 return ppd->guid; 251 } 252 return ibp->guids[index - 1]; 253 } 254 255 static int gid_ok(union ib_gid *gid, __be64 gid_prefix, __be64 id) 256 { 257 return (gid->global.interface_id == id && 258 (gid->global.subnet_prefix == gid_prefix || 259 gid->global.subnet_prefix == IB_DEFAULT_GID_PREFIX)); 260 } 261 262 /* 263 * 264 * This should be called with the QP r_lock held. 265 * 266 * The s_lock will be acquired around the qib_migrate_qp() call. 267 */ 268 int qib_ruc_check_hdr(struct qib_ibport *ibp, struct qib_ib_header *hdr, 269 int has_grh, struct qib_qp *qp, u32 bth0) 270 { 271 __be64 guid; 272 unsigned long flags; 273 274 if (qp->s_mig_state == IB_MIG_ARMED && (bth0 & IB_BTH_MIG_REQ)) { 275 if (!has_grh) { 276 if (qp->alt_ah_attr.ah_flags & IB_AH_GRH) 277 goto err; 278 } else { 279 if (!(qp->alt_ah_attr.ah_flags & IB_AH_GRH)) 280 goto err; 281 guid = get_sguid(ibp, qp->alt_ah_attr.grh.sgid_index); 282 if (!gid_ok(&hdr->u.l.grh.dgid, ibp->gid_prefix, guid)) 283 goto err; 284 if (!gid_ok(&hdr->u.l.grh.sgid, 285 qp->alt_ah_attr.grh.dgid.global.subnet_prefix, 286 qp->alt_ah_attr.grh.dgid.global.interface_id)) 287 goto err; 288 } 289 if (!qib_pkey_ok((u16)bth0, 290 qib_get_pkey(ibp, qp->s_alt_pkey_index))) { 291 qib_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_PKEY, 292 (u16)bth0, 293 (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF, 294 0, qp->ibqp.qp_num, 295 hdr->lrh[3], hdr->lrh[1]); 296 goto err; 297 } 298 /* Validate the SLID. See Ch. 9.6.1.5 and 17.2.8 */ 299 if (be16_to_cpu(hdr->lrh[3]) != qp->alt_ah_attr.dlid || 300 ppd_from_ibp(ibp)->port != qp->alt_ah_attr.port_num) 301 goto err; 302 spin_lock_irqsave(&qp->s_lock, flags); 303 qib_migrate_qp(qp); 304 spin_unlock_irqrestore(&qp->s_lock, flags); 305 } else { 306 if (!has_grh) { 307 if (qp->remote_ah_attr.ah_flags & IB_AH_GRH) 308 goto err; 309 } else { 310 if (!(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) 311 goto err; 312 guid = get_sguid(ibp, 313 qp->remote_ah_attr.grh.sgid_index); 314 if (!gid_ok(&hdr->u.l.grh.dgid, ibp->gid_prefix, guid)) 315 goto err; 316 if (!gid_ok(&hdr->u.l.grh.sgid, 317 qp->remote_ah_attr.grh.dgid.global.subnet_prefix, 318 qp->remote_ah_attr.grh.dgid.global.interface_id)) 319 goto err; 320 } 321 if (!qib_pkey_ok((u16)bth0, 322 qib_get_pkey(ibp, qp->s_pkey_index))) { 323 qib_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_PKEY, 324 (u16)bth0, 325 (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF, 326 0, qp->ibqp.qp_num, 327 hdr->lrh[3], hdr->lrh[1]); 328 goto err; 329 } 330 /* Validate the SLID. See Ch. 9.6.1.5 */ 331 if (be16_to_cpu(hdr->lrh[3]) != qp->remote_ah_attr.dlid || 332 ppd_from_ibp(ibp)->port != qp->port_num) 333 goto err; 334 if (qp->s_mig_state == IB_MIG_REARM && 335 !(bth0 & IB_BTH_MIG_REQ)) 336 qp->s_mig_state = IB_MIG_ARMED; 337 } 338 339 return 0; 340 341 err: 342 return 1; 343 } 344 345 /** 346 * qib_ruc_loopback - handle UC and RC lookback requests 347 * @sqp: the sending QP 348 * 349 * This is called from qib_do_send() to 350 * forward a WQE addressed to the same HCA. 351 * Note that although we are single threaded due to the tasklet, we still 352 * have to protect against post_send(). We don't have to worry about 353 * receive interrupts since this is a connected protocol and all packets 354 * will pass through here. 355 */ 356 static void qib_ruc_loopback(struct qib_qp *sqp) 357 { 358 struct qib_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num); 359 struct qib_qp *qp; 360 struct qib_swqe *wqe; 361 struct qib_sge *sge; 362 unsigned long flags; 363 struct ib_wc wc; 364 u64 sdata; 365 atomic64_t *maddr; 366 enum ib_wc_status send_status; 367 int release; 368 int ret; 369 370 /* 371 * Note that we check the responder QP state after 372 * checking the requester's state. 373 */ 374 qp = qib_lookup_qpn(ibp, sqp->remote_qpn); 375 376 spin_lock_irqsave(&sqp->s_lock, flags); 377 378 /* Return if we are already busy processing a work request. */ 379 if ((sqp->s_flags & (QIB_S_BUSY | QIB_S_ANY_WAIT)) || 380 !(ib_qib_state_ops[sqp->state] & QIB_PROCESS_OR_FLUSH_SEND)) 381 goto unlock; 382 383 sqp->s_flags |= QIB_S_BUSY; 384 385 again: 386 if (sqp->s_last == sqp->s_head) 387 goto clr_busy; 388 wqe = get_swqe_ptr(sqp, sqp->s_last); 389 390 /* Return if it is not OK to start a new work reqeust. */ 391 if (!(ib_qib_state_ops[sqp->state] & QIB_PROCESS_NEXT_SEND_OK)) { 392 if (!(ib_qib_state_ops[sqp->state] & QIB_FLUSH_SEND)) 393 goto clr_busy; 394 /* We are in the error state, flush the work request. */ 395 send_status = IB_WC_WR_FLUSH_ERR; 396 goto flush_send; 397 } 398 399 /* 400 * We can rely on the entry not changing without the s_lock 401 * being held until we update s_last. 402 * We increment s_cur to indicate s_last is in progress. 403 */ 404 if (sqp->s_last == sqp->s_cur) { 405 if (++sqp->s_cur >= sqp->s_size) 406 sqp->s_cur = 0; 407 } 408 spin_unlock_irqrestore(&sqp->s_lock, flags); 409 410 if (!qp || !(ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK) || 411 qp->ibqp.qp_type != sqp->ibqp.qp_type) { 412 ibp->n_pkt_drops++; 413 /* 414 * For RC, the requester would timeout and retry so 415 * shortcut the timeouts and just signal too many retries. 416 */ 417 if (sqp->ibqp.qp_type == IB_QPT_RC) 418 send_status = IB_WC_RETRY_EXC_ERR; 419 else 420 send_status = IB_WC_SUCCESS; 421 goto serr; 422 } 423 424 memset(&wc, 0, sizeof(wc)); 425 send_status = IB_WC_SUCCESS; 426 427 release = 1; 428 sqp->s_sge.sge = wqe->sg_list[0]; 429 sqp->s_sge.sg_list = wqe->sg_list + 1; 430 sqp->s_sge.num_sge = wqe->wr.num_sge; 431 sqp->s_len = wqe->length; 432 switch (wqe->wr.opcode) { 433 case IB_WR_SEND_WITH_IMM: 434 wc.wc_flags = IB_WC_WITH_IMM; 435 wc.ex.imm_data = wqe->wr.ex.imm_data; 436 /* FALLTHROUGH */ 437 case IB_WR_SEND: 438 ret = qib_get_rwqe(qp, 0); 439 if (ret < 0) 440 goto op_err; 441 if (!ret) 442 goto rnr_nak; 443 break; 444 445 case IB_WR_RDMA_WRITE_WITH_IMM: 446 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) 447 goto inv_err; 448 wc.wc_flags = IB_WC_WITH_IMM; 449 wc.ex.imm_data = wqe->wr.ex.imm_data; 450 ret = qib_get_rwqe(qp, 1); 451 if (ret < 0) 452 goto op_err; 453 if (!ret) 454 goto rnr_nak; 455 /* FALLTHROUGH */ 456 case IB_WR_RDMA_WRITE: 457 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) 458 goto inv_err; 459 if (wqe->length == 0) 460 break; 461 if (unlikely(!qib_rkey_ok(qp, &qp->r_sge.sge, wqe->length, 462 wqe->wr.wr.rdma.remote_addr, 463 wqe->wr.wr.rdma.rkey, 464 IB_ACCESS_REMOTE_WRITE))) 465 goto acc_err; 466 qp->r_sge.sg_list = NULL; 467 qp->r_sge.num_sge = 1; 468 qp->r_sge.total_len = wqe->length; 469 break; 470 471 case IB_WR_RDMA_READ: 472 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ))) 473 goto inv_err; 474 if (unlikely(!qib_rkey_ok(qp, &sqp->s_sge.sge, wqe->length, 475 wqe->wr.wr.rdma.remote_addr, 476 wqe->wr.wr.rdma.rkey, 477 IB_ACCESS_REMOTE_READ))) 478 goto acc_err; 479 release = 0; 480 sqp->s_sge.sg_list = NULL; 481 sqp->s_sge.num_sge = 1; 482 qp->r_sge.sge = wqe->sg_list[0]; 483 qp->r_sge.sg_list = wqe->sg_list + 1; 484 qp->r_sge.num_sge = wqe->wr.num_sge; 485 qp->r_sge.total_len = wqe->length; 486 break; 487 488 case IB_WR_ATOMIC_CMP_AND_SWP: 489 case IB_WR_ATOMIC_FETCH_AND_ADD: 490 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) 491 goto inv_err; 492 if (unlikely(!qib_rkey_ok(qp, &qp->r_sge.sge, sizeof(u64), 493 wqe->wr.wr.atomic.remote_addr, 494 wqe->wr.wr.atomic.rkey, 495 IB_ACCESS_REMOTE_ATOMIC))) 496 goto acc_err; 497 /* Perform atomic OP and save result. */ 498 maddr = (atomic64_t *) qp->r_sge.sge.vaddr; 499 sdata = wqe->wr.wr.atomic.compare_add; 500 *(u64 *) sqp->s_sge.sge.vaddr = 501 (wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) ? 502 (u64) atomic64_add_return(sdata, maddr) - sdata : 503 (u64) cmpxchg((u64 *) qp->r_sge.sge.vaddr, 504 sdata, wqe->wr.wr.atomic.swap); 505 qib_put_mr(qp->r_sge.sge.mr); 506 qp->r_sge.num_sge = 0; 507 goto send_comp; 508 509 default: 510 send_status = IB_WC_LOC_QP_OP_ERR; 511 goto serr; 512 } 513 514 sge = &sqp->s_sge.sge; 515 while (sqp->s_len) { 516 u32 len = sqp->s_len; 517 518 if (len > sge->length) 519 len = sge->length; 520 if (len > sge->sge_length) 521 len = sge->sge_length; 522 BUG_ON(len == 0); 523 qib_copy_sge(&qp->r_sge, sge->vaddr, len, release); 524 sge->vaddr += len; 525 sge->length -= len; 526 sge->sge_length -= len; 527 if (sge->sge_length == 0) { 528 if (!release) 529 qib_put_mr(sge->mr); 530 if (--sqp->s_sge.num_sge) 531 *sge = *sqp->s_sge.sg_list++; 532 } else if (sge->length == 0 && sge->mr->lkey) { 533 if (++sge->n >= QIB_SEGSZ) { 534 if (++sge->m >= sge->mr->mapsz) 535 break; 536 sge->n = 0; 537 } 538 sge->vaddr = 539 sge->mr->map[sge->m]->segs[sge->n].vaddr; 540 sge->length = 541 sge->mr->map[sge->m]->segs[sge->n].length; 542 } 543 sqp->s_len -= len; 544 } 545 if (release) 546 qib_put_ss(&qp->r_sge); 547 548 if (!test_and_clear_bit(QIB_R_WRID_VALID, &qp->r_aflags)) 549 goto send_comp; 550 551 if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM) 552 wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; 553 else 554 wc.opcode = IB_WC_RECV; 555 wc.wr_id = qp->r_wr_id; 556 wc.status = IB_WC_SUCCESS; 557 wc.byte_len = wqe->length; 558 wc.qp = &qp->ibqp; 559 wc.src_qp = qp->remote_qpn; 560 wc.slid = qp->remote_ah_attr.dlid; 561 wc.sl = qp->remote_ah_attr.sl; 562 wc.port_num = 1; 563 /* Signal completion event if the solicited bit is set. */ 564 qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 565 wqe->wr.send_flags & IB_SEND_SOLICITED); 566 567 send_comp: 568 spin_lock_irqsave(&sqp->s_lock, flags); 569 ibp->n_loop_pkts++; 570 flush_send: 571 sqp->s_rnr_retry = sqp->s_rnr_retry_cnt; 572 qib_send_complete(sqp, wqe, send_status); 573 goto again; 574 575 rnr_nak: 576 /* Handle RNR NAK */ 577 if (qp->ibqp.qp_type == IB_QPT_UC) 578 goto send_comp; 579 ibp->n_rnr_naks++; 580 /* 581 * Note: we don't need the s_lock held since the BUSY flag 582 * makes this single threaded. 583 */ 584 if (sqp->s_rnr_retry == 0) { 585 send_status = IB_WC_RNR_RETRY_EXC_ERR; 586 goto serr; 587 } 588 if (sqp->s_rnr_retry_cnt < 7) 589 sqp->s_rnr_retry--; 590 spin_lock_irqsave(&sqp->s_lock, flags); 591 if (!(ib_qib_state_ops[sqp->state] & QIB_PROCESS_RECV_OK)) 592 goto clr_busy; 593 sqp->s_flags |= QIB_S_WAIT_RNR; 594 sqp->s_timer.function = qib_rc_rnr_retry; 595 sqp->s_timer.expires = jiffies + 596 usecs_to_jiffies(ib_qib_rnr_table[qp->r_min_rnr_timer]); 597 add_timer(&sqp->s_timer); 598 goto clr_busy; 599 600 op_err: 601 send_status = IB_WC_REM_OP_ERR; 602 wc.status = IB_WC_LOC_QP_OP_ERR; 603 goto err; 604 605 inv_err: 606 send_status = IB_WC_REM_INV_REQ_ERR; 607 wc.status = IB_WC_LOC_QP_OP_ERR; 608 goto err; 609 610 acc_err: 611 send_status = IB_WC_REM_ACCESS_ERR; 612 wc.status = IB_WC_LOC_PROT_ERR; 613 err: 614 /* responder goes to error state */ 615 qib_rc_error(qp, wc.status); 616 617 serr: 618 spin_lock_irqsave(&sqp->s_lock, flags); 619 qib_send_complete(sqp, wqe, send_status); 620 if (sqp->ibqp.qp_type == IB_QPT_RC) { 621 int lastwqe = qib_error_qp(sqp, IB_WC_WR_FLUSH_ERR); 622 623 sqp->s_flags &= ~QIB_S_BUSY; 624 spin_unlock_irqrestore(&sqp->s_lock, flags); 625 if (lastwqe) { 626 struct ib_event ev; 627 628 ev.device = sqp->ibqp.device; 629 ev.element.qp = &sqp->ibqp; 630 ev.event = IB_EVENT_QP_LAST_WQE_REACHED; 631 sqp->ibqp.event_handler(&ev, sqp->ibqp.qp_context); 632 } 633 goto done; 634 } 635 clr_busy: 636 sqp->s_flags &= ~QIB_S_BUSY; 637 unlock: 638 spin_unlock_irqrestore(&sqp->s_lock, flags); 639 done: 640 if (qp && atomic_dec_and_test(&qp->refcount)) 641 wake_up(&qp->wait); 642 } 643 644 /** 645 * qib_make_grh - construct a GRH header 646 * @ibp: a pointer to the IB port 647 * @hdr: a pointer to the GRH header being constructed 648 * @grh: the global route address to send to 649 * @hwords: the number of 32 bit words of header being sent 650 * @nwords: the number of 32 bit words of data being sent 651 * 652 * Return the size of the header in 32 bit words. 653 */ 654 u32 qib_make_grh(struct qib_ibport *ibp, struct ib_grh *hdr, 655 struct ib_global_route *grh, u32 hwords, u32 nwords) 656 { 657 hdr->version_tclass_flow = 658 cpu_to_be32((IB_GRH_VERSION << IB_GRH_VERSION_SHIFT) | 659 (grh->traffic_class << IB_GRH_TCLASS_SHIFT) | 660 (grh->flow_label << IB_GRH_FLOW_SHIFT)); 661 hdr->paylen = cpu_to_be16((hwords - 2 + nwords + SIZE_OF_CRC) << 2); 662 /* next_hdr is defined by C8-7 in ch. 8.4.1 */ 663 hdr->next_hdr = IB_GRH_NEXT_HDR; 664 hdr->hop_limit = grh->hop_limit; 665 /* The SGID is 32-bit aligned. */ 666 hdr->sgid.global.subnet_prefix = ibp->gid_prefix; 667 hdr->sgid.global.interface_id = grh->sgid_index ? 668 ibp->guids[grh->sgid_index - 1] : ppd_from_ibp(ibp)->guid; 669 hdr->dgid = grh->dgid; 670 671 /* GRH header size in 32-bit words. */ 672 return sizeof(struct ib_grh) / sizeof(u32); 673 } 674 675 void qib_make_ruc_header(struct qib_qp *qp, struct qib_other_headers *ohdr, 676 u32 bth0, u32 bth2) 677 { 678 struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); 679 u16 lrh0; 680 u32 nwords; 681 u32 extra_bytes; 682 683 /* Construct the header. */ 684 extra_bytes = -qp->s_cur_size & 3; 685 nwords = (qp->s_cur_size + extra_bytes) >> 2; 686 lrh0 = QIB_LRH_BTH; 687 if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) { 688 qp->s_hdrwords += qib_make_grh(ibp, &qp->s_hdr->u.l.grh, 689 &qp->remote_ah_attr.grh, 690 qp->s_hdrwords, nwords); 691 lrh0 = QIB_LRH_GRH; 692 } 693 lrh0 |= ibp->sl_to_vl[qp->remote_ah_attr.sl] << 12 | 694 qp->remote_ah_attr.sl << 4; 695 qp->s_hdr->lrh[0] = cpu_to_be16(lrh0); 696 qp->s_hdr->lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid); 697 qp->s_hdr->lrh[2] = cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC); 698 qp->s_hdr->lrh[3] = cpu_to_be16(ppd_from_ibp(ibp)->lid | 699 qp->remote_ah_attr.src_path_bits); 700 bth0 |= qib_get_pkey(ibp, qp->s_pkey_index); 701 bth0 |= extra_bytes << 20; 702 if (qp->s_mig_state == IB_MIG_MIGRATED) 703 bth0 |= IB_BTH_MIG_REQ; 704 ohdr->bth[0] = cpu_to_be32(bth0); 705 ohdr->bth[1] = cpu_to_be32(qp->remote_qpn); 706 ohdr->bth[2] = cpu_to_be32(bth2); 707 this_cpu_inc(ibp->pmastats->n_unicast_xmit); 708 } 709 710 /** 711 * qib_do_send - perform a send on a QP 712 * @work: contains a pointer to the QP 713 * 714 * Process entries in the send work queue until credit or queue is 715 * exhausted. Only allow one CPU to send a packet per QP (tasklet). 716 * Otherwise, two threads could send packets out of order. 717 */ 718 void qib_do_send(struct work_struct *work) 719 { 720 struct qib_qp *qp = container_of(work, struct qib_qp, s_work); 721 struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); 722 struct qib_pportdata *ppd = ppd_from_ibp(ibp); 723 int (*make_req)(struct qib_qp *qp); 724 unsigned long flags; 725 726 if ((qp->ibqp.qp_type == IB_QPT_RC || 727 qp->ibqp.qp_type == IB_QPT_UC) && 728 (qp->remote_ah_attr.dlid & ~((1 << ppd->lmc) - 1)) == ppd->lid) { 729 qib_ruc_loopback(qp); 730 return; 731 } 732 733 if (qp->ibqp.qp_type == IB_QPT_RC) 734 make_req = qib_make_rc_req; 735 else if (qp->ibqp.qp_type == IB_QPT_UC) 736 make_req = qib_make_uc_req; 737 else 738 make_req = qib_make_ud_req; 739 740 spin_lock_irqsave(&qp->s_lock, flags); 741 742 /* Return if we are already busy processing a work request. */ 743 if (!qib_send_ok(qp)) { 744 spin_unlock_irqrestore(&qp->s_lock, flags); 745 return; 746 } 747 748 qp->s_flags |= QIB_S_BUSY; 749 750 spin_unlock_irqrestore(&qp->s_lock, flags); 751 752 do { 753 /* Check for a constructed packet to be sent. */ 754 if (qp->s_hdrwords != 0) { 755 /* 756 * If the packet cannot be sent now, return and 757 * the send tasklet will be woken up later. 758 */ 759 if (qib_verbs_send(qp, qp->s_hdr, qp->s_hdrwords, 760 qp->s_cur_sge, qp->s_cur_size)) 761 break; 762 /* Record that s_hdr is empty. */ 763 qp->s_hdrwords = 0; 764 } 765 } while (make_req(qp)); 766 } 767 768 /* 769 * This should be called with s_lock held. 770 */ 771 void qib_send_complete(struct qib_qp *qp, struct qib_swqe *wqe, 772 enum ib_wc_status status) 773 { 774 u32 old_last, last; 775 unsigned i; 776 777 if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_OR_FLUSH_SEND)) 778 return; 779 780 for (i = 0; i < wqe->wr.num_sge; i++) { 781 struct qib_sge *sge = &wqe->sg_list[i]; 782 783 qib_put_mr(sge->mr); 784 } 785 if (qp->ibqp.qp_type == IB_QPT_UD || 786 qp->ibqp.qp_type == IB_QPT_SMI || 787 qp->ibqp.qp_type == IB_QPT_GSI) 788 atomic_dec(&to_iah(wqe->wr.wr.ud.ah)->refcount); 789 790 /* See ch. 11.2.4.1 and 10.7.3.1 */ 791 if (!(qp->s_flags & QIB_S_SIGNAL_REQ_WR) || 792 (wqe->wr.send_flags & IB_SEND_SIGNALED) || 793 status != IB_WC_SUCCESS) { 794 struct ib_wc wc; 795 796 memset(&wc, 0, sizeof(wc)); 797 wc.wr_id = wqe->wr.wr_id; 798 wc.status = status; 799 wc.opcode = ib_qib_wc_opcode[wqe->wr.opcode]; 800 wc.qp = &qp->ibqp; 801 if (status == IB_WC_SUCCESS) 802 wc.byte_len = wqe->length; 803 qib_cq_enter(to_icq(qp->ibqp.send_cq), &wc, 804 status != IB_WC_SUCCESS); 805 } 806 807 last = qp->s_last; 808 old_last = last; 809 if (++last >= qp->s_size) 810 last = 0; 811 qp->s_last = last; 812 if (qp->s_acked == old_last) 813 qp->s_acked = last; 814 if (qp->s_cur == old_last) 815 qp->s_cur = last; 816 if (qp->s_tail == old_last) 817 qp->s_tail = last; 818 if (qp->state == IB_QPS_SQD && last == qp->s_cur) 819 qp->s_draining = 0; 820 } 821