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 */ 42const 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 */ 81static 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 109bad_lkey: 110 while (j) { 111 struct qib_sge *sge = --j ? &ss->sg_list[j - 1] : &ss->sge; 112 113 atomic_dec(&sge->mr->refcount); 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; 124bail: 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 */ 138int 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 } 219unlock: 220 spin_unlock_irqrestore(&rq->lock, flags); 221bail: 222 return ret; 223} 224 225/* 226 * Switch to alternate path. 227 * The QP s_lock should be held and interrupts disabled. 228 */ 229void 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 244static __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 254static 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 s_lock held. 264 */ 265int qib_ruc_check_hdr(struct qib_ibport *ibp, struct qib_ib_header *hdr, 266 int has_grh, struct qib_qp *qp, u32 bth0) 267{ 268 __be64 guid; 269 270 if (qp->s_mig_state == IB_MIG_ARMED && (bth0 & IB_BTH_MIG_REQ)) { 271 if (!has_grh) { 272 if (qp->alt_ah_attr.ah_flags & IB_AH_GRH) 273 goto err; 274 } else { 275 if (!(qp->alt_ah_attr.ah_flags & IB_AH_GRH)) 276 goto err; 277 guid = get_sguid(ibp, qp->alt_ah_attr.grh.sgid_index); 278 if (!gid_ok(&hdr->u.l.grh.dgid, ibp->gid_prefix, guid)) 279 goto err; 280 if (!gid_ok(&hdr->u.l.grh.sgid, 281 qp->alt_ah_attr.grh.dgid.global.subnet_prefix, 282 qp->alt_ah_attr.grh.dgid.global.interface_id)) 283 goto err; 284 } 285 if (!qib_pkey_ok((u16)bth0, 286 qib_get_pkey(ibp, qp->s_alt_pkey_index))) { 287 qib_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_PKEY, 288 (u16)bth0, 289 (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF, 290 0, qp->ibqp.qp_num, 291 hdr->lrh[3], hdr->lrh[1]); 292 goto err; 293 } 294 /* Validate the SLID. See Ch. 9.6.1.5 and 17.2.8 */ 295 if (be16_to_cpu(hdr->lrh[3]) != qp->alt_ah_attr.dlid || 296 ppd_from_ibp(ibp)->port != qp->alt_ah_attr.port_num) 297 goto err; 298 qib_migrate_qp(qp); 299 } else { 300 if (!has_grh) { 301 if (qp->remote_ah_attr.ah_flags & IB_AH_GRH) 302 goto err; 303 } else { 304 if (!(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) 305 goto err; 306 guid = get_sguid(ibp, 307 qp->remote_ah_attr.grh.sgid_index); 308 if (!gid_ok(&hdr->u.l.grh.dgid, ibp->gid_prefix, guid)) 309 goto err; 310 if (!gid_ok(&hdr->u.l.grh.sgid, 311 qp->remote_ah_attr.grh.dgid.global.subnet_prefix, 312 qp->remote_ah_attr.grh.dgid.global.interface_id)) 313 goto err; 314 } 315 if (!qib_pkey_ok((u16)bth0, 316 qib_get_pkey(ibp, qp->s_pkey_index))) { 317 qib_bad_pqkey(ibp, IB_NOTICE_TRAP_BAD_PKEY, 318 (u16)bth0, 319 (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF, 320 0, qp->ibqp.qp_num, 321 hdr->lrh[3], hdr->lrh[1]); 322 goto err; 323 } 324 /* Validate the SLID. See Ch. 9.6.1.5 */ 325 if (be16_to_cpu(hdr->lrh[3]) != qp->remote_ah_attr.dlid || 326 ppd_from_ibp(ibp)->port != qp->port_num) 327 goto err; 328 if (qp->s_mig_state == IB_MIG_REARM && 329 !(bth0 & IB_BTH_MIG_REQ)) 330 qp->s_mig_state = IB_MIG_ARMED; 331 } 332 333 return 0; 334 335err: 336 return 1; 337} 338 339/** 340 * qib_ruc_loopback - handle UC and RC lookback requests 341 * @sqp: the sending QP 342 * 343 * This is called from qib_do_send() to 344 * forward a WQE addressed to the same HCA. 345 * Note that although we are single threaded due to the tasklet, we still 346 * have to protect against post_send(). We don't have to worry about 347 * receive interrupts since this is a connected protocol and all packets 348 * will pass through here. 349 */ 350static void qib_ruc_loopback(struct qib_qp *sqp) 351{ 352 struct qib_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num); 353 struct qib_qp *qp; 354 struct qib_swqe *wqe; 355 struct qib_sge *sge; 356 unsigned long flags; 357 struct ib_wc wc; 358 u64 sdata; 359 atomic64_t *maddr; 360 enum ib_wc_status send_status; 361 int release; 362 int ret; 363 364 /* 365 * Note that we check the responder QP state after 366 * checking the requester's state. 367 */ 368 qp = qib_lookup_qpn(ibp, sqp->remote_qpn); 369 370 spin_lock_irqsave(&sqp->s_lock, flags); 371 372 /* Return if we are already busy processing a work request. */ 373 if ((sqp->s_flags & (QIB_S_BUSY | QIB_S_ANY_WAIT)) || 374 !(ib_qib_state_ops[sqp->state] & QIB_PROCESS_OR_FLUSH_SEND)) 375 goto unlock; 376 377 sqp->s_flags |= QIB_S_BUSY; 378 379again: 380 if (sqp->s_last == sqp->s_head) 381 goto clr_busy; 382 wqe = get_swqe_ptr(sqp, sqp->s_last); 383 384 /* Return if it is not OK to start a new work reqeust. */ 385 if (!(ib_qib_state_ops[sqp->state] & QIB_PROCESS_NEXT_SEND_OK)) { 386 if (!(ib_qib_state_ops[sqp->state] & QIB_FLUSH_SEND)) 387 goto clr_busy; 388 /* We are in the error state, flush the work request. */ 389 send_status = IB_WC_WR_FLUSH_ERR; 390 goto flush_send; 391 } 392 393 /* 394 * We can rely on the entry not changing without the s_lock 395 * being held until we update s_last. 396 * We increment s_cur to indicate s_last is in progress. 397 */ 398 if (sqp->s_last == sqp->s_cur) { 399 if (++sqp->s_cur >= sqp->s_size) 400 sqp->s_cur = 0; 401 } 402 spin_unlock_irqrestore(&sqp->s_lock, flags); 403 404 if (!qp || !(ib_qib_state_ops[qp->state] & QIB_PROCESS_RECV_OK) || 405 qp->ibqp.qp_type != sqp->ibqp.qp_type) { 406 ibp->n_pkt_drops++; 407 /* 408 * For RC, the requester would timeout and retry so 409 * shortcut the timeouts and just signal too many retries. 410 */ 411 if (sqp->ibqp.qp_type == IB_QPT_RC) 412 send_status = IB_WC_RETRY_EXC_ERR; 413 else 414 send_status = IB_WC_SUCCESS; 415 goto serr; 416 } 417 418 memset(&wc, 0, sizeof wc); 419 send_status = IB_WC_SUCCESS; 420 421 release = 1; 422 sqp->s_sge.sge = wqe->sg_list[0]; 423 sqp->s_sge.sg_list = wqe->sg_list + 1; 424 sqp->s_sge.num_sge = wqe->wr.num_sge; 425 sqp->s_len = wqe->length; 426 switch (wqe->wr.opcode) { 427 case IB_WR_SEND_WITH_IMM: 428 wc.wc_flags = IB_WC_WITH_IMM; 429 wc.ex.imm_data = wqe->wr.ex.imm_data; 430 /* FALLTHROUGH */ 431 case IB_WR_SEND: 432 ret = qib_get_rwqe(qp, 0); 433 if (ret < 0) 434 goto op_err; 435 if (!ret) 436 goto rnr_nak; 437 break; 438 439 case IB_WR_RDMA_WRITE_WITH_IMM: 440 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) 441 goto inv_err; 442 wc.wc_flags = IB_WC_WITH_IMM; 443 wc.ex.imm_data = wqe->wr.ex.imm_data; 444 ret = qib_get_rwqe(qp, 1); 445 if (ret < 0) 446 goto op_err; 447 if (!ret) 448 goto rnr_nak; 449 /* FALLTHROUGH */ 450 case IB_WR_RDMA_WRITE: 451 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) 452 goto inv_err; 453 if (wqe->length == 0) 454 break; 455 if (unlikely(!qib_rkey_ok(qp, &qp->r_sge.sge, wqe->length, 456 wqe->wr.wr.rdma.remote_addr, 457 wqe->wr.wr.rdma.rkey, 458 IB_ACCESS_REMOTE_WRITE))) 459 goto acc_err; 460 qp->r_sge.sg_list = NULL; 461 qp->r_sge.num_sge = 1; 462 qp->r_sge.total_len = wqe->length; 463 break; 464 465 case IB_WR_RDMA_READ: 466 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ))) 467 goto inv_err; 468 if (unlikely(!qib_rkey_ok(qp, &sqp->s_sge.sge, wqe->length, 469 wqe->wr.wr.rdma.remote_addr, 470 wqe->wr.wr.rdma.rkey, 471 IB_ACCESS_REMOTE_READ))) 472 goto acc_err; 473 release = 0; 474 sqp->s_sge.sg_list = NULL; 475 sqp->s_sge.num_sge = 1; 476 qp->r_sge.sge = wqe->sg_list[0]; 477 qp->r_sge.sg_list = wqe->sg_list + 1; 478 qp->r_sge.num_sge = wqe->wr.num_sge; 479 qp->r_sge.total_len = wqe->length; 480 break; 481 482 case IB_WR_ATOMIC_CMP_AND_SWP: 483 case IB_WR_ATOMIC_FETCH_AND_ADD: 484 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) 485 goto inv_err; 486 if (unlikely(!qib_rkey_ok(qp, &qp->r_sge.sge, sizeof(u64), 487 wqe->wr.wr.atomic.remote_addr, 488 wqe->wr.wr.atomic.rkey, 489 IB_ACCESS_REMOTE_ATOMIC))) 490 goto acc_err; 491 /* Perform atomic OP and save result. */ 492 maddr = (atomic64_t *) qp->r_sge.sge.vaddr; 493 sdata = wqe->wr.wr.atomic.compare_add; 494 *(u64 *) sqp->s_sge.sge.vaddr = 495 (wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) ? 496 (u64) atomic64_add_return(sdata, maddr) - sdata : 497 (u64) cmpxchg((u64 *) qp->r_sge.sge.vaddr, 498 sdata, wqe->wr.wr.atomic.swap); 499 atomic_dec(&qp->r_sge.sge.mr->refcount); 500 qp->r_sge.num_sge = 0; 501 goto send_comp; 502 503 default: 504 send_status = IB_WC_LOC_QP_OP_ERR; 505 goto serr; 506 } 507 508 sge = &sqp->s_sge.sge; 509 while (sqp->s_len) { 510 u32 len = sqp->s_len; 511 512 if (len > sge->length) 513 len = sge->length; 514 if (len > sge->sge_length) 515 len = sge->sge_length; 516 BUG_ON(len == 0); 517 qib_copy_sge(&qp->r_sge, sge->vaddr, len, release); 518 sge->vaddr += len; 519 sge->length -= len; 520 sge->sge_length -= len; 521 if (sge->sge_length == 0) { 522 if (!release) 523 atomic_dec(&sge->mr->refcount); 524 if (--sqp->s_sge.num_sge) 525 *sge = *sqp->s_sge.sg_list++; 526 } else if (sge->length == 0 && sge->mr->lkey) { 527 if (++sge->n >= QIB_SEGSZ) { 528 if (++sge->m >= sge->mr->mapsz) 529 break; 530 sge->n = 0; 531 } 532 sge->vaddr = 533 sge->mr->map[sge->m]->segs[sge->n].vaddr; 534 sge->length = 535 sge->mr->map[sge->m]->segs[sge->n].length; 536 } 537 sqp->s_len -= len; 538 } 539 if (release) 540 while (qp->r_sge.num_sge) { 541 atomic_dec(&qp->r_sge.sge.mr->refcount); 542 if (--qp->r_sge.num_sge) 543 qp->r_sge.sge = *qp->r_sge.sg_list++; 544 } 545 546 if (!test_and_clear_bit(QIB_R_WRID_VALID, &qp->r_aflags)) 547 goto send_comp; 548 549 if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM) 550 wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; 551 else 552 wc.opcode = IB_WC_RECV; 553 wc.wr_id = qp->r_wr_id; 554 wc.status = IB_WC_SUCCESS; 555 wc.byte_len = wqe->length; 556 wc.qp = &qp->ibqp; 557 wc.src_qp = qp->remote_qpn; 558 wc.slid = qp->remote_ah_attr.dlid; 559 wc.sl = qp->remote_ah_attr.sl; 560 wc.port_num = 1; 561 /* Signal completion event if the solicited bit is set. */ 562 qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 563 wqe->wr.send_flags & IB_SEND_SOLICITED); 564 565send_comp: 566 spin_lock_irqsave(&sqp->s_lock, flags); 567 ibp->n_loop_pkts++; 568flush_send: 569 sqp->s_rnr_retry = sqp->s_rnr_retry_cnt; 570 qib_send_complete(sqp, wqe, send_status); 571 goto again; 572 573rnr_nak: 574 /* Handle RNR NAK */ 575 if (qp->ibqp.qp_type == IB_QPT_UC) 576 goto send_comp; 577 ibp->n_rnr_naks++; 578 /* 579 * Note: we don't need the s_lock held since the BUSY flag 580 * makes this single threaded. 581 */ 582 if (sqp->s_rnr_retry == 0) { 583 send_status = IB_WC_RNR_RETRY_EXC_ERR; 584 goto serr; 585 } 586 if (sqp->s_rnr_retry_cnt < 7) 587 sqp->s_rnr_retry--; 588 spin_lock_irqsave(&sqp->s_lock, flags); 589 if (!(ib_qib_state_ops[sqp->state] & QIB_PROCESS_RECV_OK)) 590 goto clr_busy; 591 sqp->s_flags |= QIB_S_WAIT_RNR; 592 sqp->s_timer.function = qib_rc_rnr_retry; 593 sqp->s_timer.expires = jiffies + 594 usecs_to_jiffies(ib_qib_rnr_table[qp->r_min_rnr_timer]); 595 add_timer(&sqp->s_timer); 596 goto clr_busy; 597 598op_err: 599 send_status = IB_WC_REM_OP_ERR; 600 wc.status = IB_WC_LOC_QP_OP_ERR; 601 goto err; 602 603inv_err: 604 send_status = IB_WC_REM_INV_REQ_ERR; 605 wc.status = IB_WC_LOC_QP_OP_ERR; 606 goto err; 607 608acc_err: 609 send_status = IB_WC_REM_ACCESS_ERR; 610 wc.status = IB_WC_LOC_PROT_ERR; 611err: 612 /* responder goes to error state */ 613 qib_rc_error(qp, wc.status); 614 615serr: 616 spin_lock_irqsave(&sqp->s_lock, flags); 617 qib_send_complete(sqp, wqe, send_status); 618 if (sqp->ibqp.qp_type == IB_QPT_RC) { 619 int lastwqe = qib_error_qp(sqp, IB_WC_WR_FLUSH_ERR); 620 621 sqp->s_flags &= ~QIB_S_BUSY; 622 spin_unlock_irqrestore(&sqp->s_lock, flags); 623 if (lastwqe) { 624 struct ib_event ev; 625 626 ev.device = sqp->ibqp.device; 627 ev.element.qp = &sqp->ibqp; 628 ev.event = IB_EVENT_QP_LAST_WQE_REACHED; 629 sqp->ibqp.event_handler(&ev, sqp->ibqp.qp_context); 630 } 631 goto done; 632 } 633clr_busy: 634 sqp->s_flags &= ~QIB_S_BUSY; 635unlock: 636 spin_unlock_irqrestore(&sqp->s_lock, flags); 637done: 638 if (qp && atomic_dec_and_test(&qp->refcount)) 639 wake_up(&qp->wait); 640} 641 642/** 643 * qib_make_grh - construct a GRH header 644 * @ibp: a pointer to the IB port 645 * @hdr: a pointer to the GRH header being constructed 646 * @grh: the global route address to send to 647 * @hwords: the number of 32 bit words of header being sent 648 * @nwords: the number of 32 bit words of data being sent 649 * 650 * Return the size of the header in 32 bit words. 651 */ 652u32 qib_make_grh(struct qib_ibport *ibp, struct ib_grh *hdr, 653 struct ib_global_route *grh, u32 hwords, u32 nwords) 654{ 655 hdr->version_tclass_flow = 656 cpu_to_be32((IB_GRH_VERSION << IB_GRH_VERSION_SHIFT) | 657 (grh->traffic_class << IB_GRH_TCLASS_SHIFT) | 658 (grh->flow_label << IB_GRH_FLOW_SHIFT)); 659 hdr->paylen = cpu_to_be16((hwords - 2 + nwords + SIZE_OF_CRC) << 2); 660 /* next_hdr is defined by C8-7 in ch. 8.4.1 */ 661 hdr->next_hdr = IB_GRH_NEXT_HDR; 662 hdr->hop_limit = grh->hop_limit; 663 /* The SGID is 32-bit aligned. */ 664 hdr->sgid.global.subnet_prefix = ibp->gid_prefix; 665 hdr->sgid.global.interface_id = grh->sgid_index ? 666 ibp->guids[grh->sgid_index - 1] : ppd_from_ibp(ibp)->guid; 667 hdr->dgid = grh->dgid; 668 669 /* GRH header size in 32-bit words. */ 670 return sizeof(struct ib_grh) / sizeof(u32); 671} 672 673void qib_make_ruc_header(struct qib_qp *qp, struct qib_other_headers *ohdr, 674 u32 bth0, u32 bth2) 675{ 676 struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); 677 u16 lrh0; 678 u32 nwords; 679 u32 extra_bytes; 680 681 /* Construct the header. */ 682 extra_bytes = -qp->s_cur_size & 3; 683 nwords = (qp->s_cur_size + extra_bytes) >> 2; 684 lrh0 = QIB_LRH_BTH; 685 if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) { 686 qp->s_hdrwords += qib_make_grh(ibp, &qp->s_hdr.u.l.grh, 687 &qp->remote_ah_attr.grh, 688 qp->s_hdrwords, nwords); 689 lrh0 = QIB_LRH_GRH; 690 } 691 lrh0 |= ibp->sl_to_vl[qp->remote_ah_attr.sl] << 12 | 692 qp->remote_ah_attr.sl << 4; 693 qp->s_hdr.lrh[0] = cpu_to_be16(lrh0); 694 qp->s_hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid); 695 qp->s_hdr.lrh[2] = cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC); 696 qp->s_hdr.lrh[3] = cpu_to_be16(ppd_from_ibp(ibp)->lid | 697 qp->remote_ah_attr.src_path_bits); 698 bth0 |= qib_get_pkey(ibp, qp->s_pkey_index); 699 bth0 |= extra_bytes << 20; 700 if (qp->s_mig_state == IB_MIG_MIGRATED) 701 bth0 |= IB_BTH_MIG_REQ; 702 ohdr->bth[0] = cpu_to_be32(bth0); 703 ohdr->bth[1] = cpu_to_be32(qp->remote_qpn); 704 ohdr->bth[2] = cpu_to_be32(bth2); 705} 706 707/** 708 * qib_do_send - perform a send on a QP 709 * @work: contains a pointer to the QP 710 * 711 * Process entries in the send work queue until credit or queue is 712 * exhausted. Only allow one CPU to send a packet per QP (tasklet). 713 * Otherwise, two threads could send packets out of order. 714 */ 715void qib_do_send(struct work_struct *work) 716{ 717 struct qib_qp *qp = container_of(work, struct qib_qp, s_work); 718 struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); 719 struct qib_pportdata *ppd = ppd_from_ibp(ibp); 720 int (*make_req)(struct qib_qp *qp); 721 unsigned long flags; 722 723 if ((qp->ibqp.qp_type == IB_QPT_RC || 724 qp->ibqp.qp_type == IB_QPT_UC) && 725 (qp->remote_ah_attr.dlid & ~((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 |= QIB_S_BUSY; 746 747 spin_unlock_irqrestore(&qp->s_lock, flags); 748 749 do { 750 /* Check for a constructed packet to be sent. */ 751 if (qp->s_hdrwords != 0) { 752 /* 753 * If the packet cannot be sent now, return and 754 * the send tasklet will be woken up later. 755 */ 756 if (qib_verbs_send(qp, &qp->s_hdr, qp->s_hdrwords, 757 qp->s_cur_sge, qp->s_cur_size)) 758 break; 759 /* Record that s_hdr is empty. */ 760 qp->s_hdrwords = 0; 761 } 762 } while (make_req(qp)); 763} 764 765/* 766 * This should be called with s_lock held. 767 */ 768void qib_send_complete(struct qib_qp *qp, struct qib_swqe *wqe, 769 enum ib_wc_status status) 770{ 771 u32 old_last, last; 772 unsigned i; 773 774 if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_OR_FLUSH_SEND)) 775 return; 776 777 for (i = 0; i < wqe->wr.num_sge; i++) { 778 struct qib_sge *sge = &wqe->sg_list[i]; 779 780 atomic_dec(&sge->mr->refcount); 781 } 782 if (qp->ibqp.qp_type == IB_QPT_UD || 783 qp->ibqp.qp_type == IB_QPT_SMI || 784 qp->ibqp.qp_type == IB_QPT_GSI) 785 atomic_dec(&to_iah(wqe->wr.wr.ud.ah)->refcount); 786 787 /* See ch. 11.2.4.1 and 10.7.3.1 */ 788 if (!(qp->s_flags & QIB_S_SIGNAL_REQ_WR) || 789 (wqe->wr.send_flags & IB_SEND_SIGNALED) || 790 status != IB_WC_SUCCESS) { 791 struct ib_wc wc; 792 793 memset(&wc, 0, sizeof wc); 794 wc.wr_id = wqe->wr.wr_id; 795 wc.status = status; 796 wc.opcode = ib_qib_wc_opcode[wqe->wr.opcode]; 797 wc.qp = &qp->ibqp; 798 if (status == IB_WC_SUCCESS) 799 wc.byte_len = wqe->length; 800 qib_cq_enter(to_icq(qp->ibqp.send_cq), &wc, 801 status != IB_WC_SUCCESS); 802 } 803 804 last = qp->s_last; 805 old_last = last; 806 if (++last >= qp->s_size) 807 last = 0; 808 qp->s_last = last; 809 if (qp->s_acked == old_last) 810 qp->s_acked = last; 811 if (qp->s_cur == old_last) 812 qp->s_cur = last; 813 if (qp->s_tail == old_last) 814 qp->s_tail = last; 815 if (qp->state == IB_QPS_SQD && last == qp->s_cur) 816 qp->s_draining = 0; 817} 818