1 /* 2 * Copyright(c) 2015 - 2017 Intel Corporation. 3 * 4 * This file is provided under a dual BSD/GPLv2 license. When using or 5 * redistributing this file, you may do so under either license. 6 * 7 * GPL LICENSE SUMMARY 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of version 2 of the GNU General Public License as 11 * published by the Free Software Foundation. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 * BSD LICENSE 19 * 20 * Redistribution and use in source and binary forms, with or without 21 * modification, are permitted provided that the following conditions 22 * are met: 23 * 24 * - Redistributions of source code must retain the above copyright 25 * notice, this list of conditions and the following disclaimer. 26 * - Redistributions in binary form must reproduce the above copyright 27 * notice, this list of conditions and the following disclaimer in 28 * the documentation and/or other materials provided with the 29 * distribution. 30 * - Neither the name of Intel Corporation nor the names of its 31 * contributors may be used to endorse or promote products derived 32 * from this software without specific prior written permission. 33 * 34 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 35 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 36 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 37 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 38 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 39 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 40 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 41 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 42 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 43 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 44 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 45 * 46 */ 47 48 #include <linux/spinlock.h> 49 50 #include "hfi.h" 51 #include "mad.h" 52 #include "qp.h" 53 #include "verbs_txreq.h" 54 #include "trace.h" 55 56 /* 57 * Validate a RWQE and fill in the SGE state. 58 * Return 1 if OK. 59 */ 60 static int init_sge(struct rvt_qp *qp, struct rvt_rwqe *wqe) 61 { 62 int i, j, ret; 63 struct ib_wc wc; 64 struct rvt_lkey_table *rkt; 65 struct rvt_pd *pd; 66 struct rvt_sge_state *ss; 67 68 rkt = &to_idev(qp->ibqp.device)->rdi.lkey_table; 69 pd = ibpd_to_rvtpd(qp->ibqp.srq ? qp->ibqp.srq->pd : qp->ibqp.pd); 70 ss = &qp->r_sge; 71 ss->sg_list = qp->r_sg_list; 72 qp->r_len = 0; 73 for (i = j = 0; i < wqe->num_sge; i++) { 74 if (wqe->sg_list[i].length == 0) 75 continue; 76 /* Check LKEY */ 77 ret = rvt_lkey_ok(rkt, pd, j ? &ss->sg_list[j - 1] : &ss->sge, 78 NULL, &wqe->sg_list[i], 79 IB_ACCESS_LOCAL_WRITE); 80 if (unlikely(ret <= 0)) 81 goto bad_lkey; 82 qp->r_len += wqe->sg_list[i].length; 83 j++; 84 } 85 ss->num_sge = j; 86 ss->total_len = qp->r_len; 87 ret = 1; 88 goto bail; 89 90 bad_lkey: 91 while (j) { 92 struct rvt_sge *sge = --j ? &ss->sg_list[j - 1] : &ss->sge; 93 94 rvt_put_mr(sge->mr); 95 } 96 ss->num_sge = 0; 97 memset(&wc, 0, sizeof(wc)); 98 wc.wr_id = wqe->wr_id; 99 wc.status = IB_WC_LOC_PROT_ERR; 100 wc.opcode = IB_WC_RECV; 101 wc.qp = &qp->ibqp; 102 /* Signal solicited completion event. */ 103 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc, 1); 104 ret = 0; 105 bail: 106 return ret; 107 } 108 109 /** 110 * hfi1_rvt_get_rwqe - copy the next RWQE into the QP's RWQE 111 * @qp: the QP 112 * @wr_id_only: update qp->r_wr_id only, not qp->r_sge 113 * 114 * Return -1 if there is a local error, 0 if no RWQE is available, 115 * otherwise return 1. 116 * 117 * Can be called from interrupt level. 118 */ 119 int hfi1_rvt_get_rwqe(struct rvt_qp *qp, int wr_id_only) 120 { 121 unsigned long flags; 122 struct rvt_rq *rq; 123 struct rvt_rwq *wq; 124 struct rvt_srq *srq; 125 struct rvt_rwqe *wqe; 126 void (*handler)(struct ib_event *, void *); 127 u32 tail; 128 int ret; 129 130 if (qp->ibqp.srq) { 131 srq = ibsrq_to_rvtsrq(qp->ibqp.srq); 132 handler = srq->ibsrq.event_handler; 133 rq = &srq->rq; 134 } else { 135 srq = NULL; 136 handler = NULL; 137 rq = &qp->r_rq; 138 } 139 140 spin_lock_irqsave(&rq->lock, flags); 141 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) { 142 ret = 0; 143 goto unlock; 144 } 145 146 wq = rq->wq; 147 tail = wq->tail; 148 /* Validate tail before using it since it is user writable. */ 149 if (tail >= rq->size) 150 tail = 0; 151 if (unlikely(tail == wq->head)) { 152 ret = 0; 153 goto unlock; 154 } 155 /* Make sure entry is read after head index is read. */ 156 smp_rmb(); 157 wqe = rvt_get_rwqe_ptr(rq, tail); 158 /* 159 * Even though we update the tail index in memory, the verbs 160 * consumer is not supposed to post more entries until a 161 * completion is generated. 162 */ 163 if (++tail >= rq->size) 164 tail = 0; 165 wq->tail = tail; 166 if (!wr_id_only && !init_sge(qp, wqe)) { 167 ret = -1; 168 goto unlock; 169 } 170 qp->r_wr_id = wqe->wr_id; 171 172 ret = 1; 173 set_bit(RVT_R_WRID_VALID, &qp->r_aflags); 174 if (handler) { 175 u32 n; 176 177 /* 178 * Validate head pointer value and compute 179 * the number of remaining WQEs. 180 */ 181 n = wq->head; 182 if (n >= rq->size) 183 n = 0; 184 if (n < tail) 185 n += rq->size - tail; 186 else 187 n -= tail; 188 if (n < srq->limit) { 189 struct ib_event ev; 190 191 srq->limit = 0; 192 spin_unlock_irqrestore(&rq->lock, flags); 193 ev.device = qp->ibqp.device; 194 ev.element.srq = qp->ibqp.srq; 195 ev.event = IB_EVENT_SRQ_LIMIT_REACHED; 196 handler(&ev, srq->ibsrq.srq_context); 197 goto bail; 198 } 199 } 200 unlock: 201 spin_unlock_irqrestore(&rq->lock, flags); 202 bail: 203 return ret; 204 } 205 206 static int gid_ok(union ib_gid *gid, __be64 gid_prefix, __be64 id) 207 { 208 return (gid->global.interface_id == id && 209 (gid->global.subnet_prefix == gid_prefix || 210 gid->global.subnet_prefix == IB_DEFAULT_GID_PREFIX)); 211 } 212 213 /* 214 * 215 * This should be called with the QP r_lock held. 216 * 217 * The s_lock will be acquired around the hfi1_migrate_qp() call. 218 */ 219 int hfi1_ruc_check_hdr(struct hfi1_ibport *ibp, struct hfi1_packet *packet) 220 { 221 __be64 guid; 222 unsigned long flags; 223 struct rvt_qp *qp = packet->qp; 224 u8 sc5 = ibp->sl_to_sc[rdma_ah_get_sl(&qp->remote_ah_attr)]; 225 u32 dlid = packet->dlid; 226 u32 slid = packet->slid; 227 u32 sl = packet->sl; 228 int migrated; 229 u32 bth0, bth1; 230 u16 pkey; 231 232 bth0 = be32_to_cpu(packet->ohdr->bth[0]); 233 bth1 = be32_to_cpu(packet->ohdr->bth[1]); 234 if (packet->etype == RHF_RCV_TYPE_BYPASS) { 235 pkey = hfi1_16B_get_pkey(packet->hdr); 236 migrated = bth1 & OPA_BTH_MIG_REQ; 237 } else { 238 pkey = ib_bth_get_pkey(packet->ohdr); 239 migrated = bth0 & IB_BTH_MIG_REQ; 240 } 241 242 if (qp->s_mig_state == IB_MIG_ARMED && migrated) { 243 if (!packet->grh) { 244 if ((rdma_ah_get_ah_flags(&qp->alt_ah_attr) & 245 IB_AH_GRH) && 246 (packet->etype != RHF_RCV_TYPE_BYPASS)) 247 return 1; 248 } else { 249 const struct ib_global_route *grh; 250 251 if (!(rdma_ah_get_ah_flags(&qp->alt_ah_attr) & 252 IB_AH_GRH)) 253 return 1; 254 grh = rdma_ah_read_grh(&qp->alt_ah_attr); 255 guid = get_sguid(ibp, grh->sgid_index); 256 if (!gid_ok(&packet->grh->dgid, ibp->rvp.gid_prefix, 257 guid)) 258 return 1; 259 if (!gid_ok( 260 &packet->grh->sgid, 261 grh->dgid.global.subnet_prefix, 262 grh->dgid.global.interface_id)) 263 return 1; 264 } 265 if (unlikely(rcv_pkey_check(ppd_from_ibp(ibp), pkey, 266 sc5, slid))) { 267 hfi1_bad_pkey(ibp, pkey, sl, 0, qp->ibqp.qp_num, 268 slid, dlid); 269 return 1; 270 } 271 /* Validate the SLID. See Ch. 9.6.1.5 and 17.2.8 */ 272 if (slid != rdma_ah_get_dlid(&qp->alt_ah_attr) || 273 ppd_from_ibp(ibp)->port != 274 rdma_ah_get_port_num(&qp->alt_ah_attr)) 275 return 1; 276 spin_lock_irqsave(&qp->s_lock, flags); 277 hfi1_migrate_qp(qp); 278 spin_unlock_irqrestore(&qp->s_lock, flags); 279 } else { 280 if (!packet->grh) { 281 if ((rdma_ah_get_ah_flags(&qp->remote_ah_attr) & 282 IB_AH_GRH) && 283 (packet->etype != RHF_RCV_TYPE_BYPASS)) 284 return 1; 285 } else { 286 const struct ib_global_route *grh; 287 288 if (!(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & 289 IB_AH_GRH)) 290 return 1; 291 grh = rdma_ah_read_grh(&qp->remote_ah_attr); 292 guid = get_sguid(ibp, grh->sgid_index); 293 if (!gid_ok(&packet->grh->dgid, ibp->rvp.gid_prefix, 294 guid)) 295 return 1; 296 if (!gid_ok( 297 &packet->grh->sgid, 298 grh->dgid.global.subnet_prefix, 299 grh->dgid.global.interface_id)) 300 return 1; 301 } 302 if (unlikely(rcv_pkey_check(ppd_from_ibp(ibp), pkey, 303 sc5, slid))) { 304 hfi1_bad_pkey(ibp, pkey, sl, 0, qp->ibqp.qp_num, 305 slid, dlid); 306 return 1; 307 } 308 /* Validate the SLID. See Ch. 9.6.1.5 */ 309 if ((slid != rdma_ah_get_dlid(&qp->remote_ah_attr)) || 310 ppd_from_ibp(ibp)->port != qp->port_num) 311 return 1; 312 if (qp->s_mig_state == IB_MIG_REARM && !migrated) 313 qp->s_mig_state = IB_MIG_ARMED; 314 } 315 316 return 0; 317 } 318 319 /** 320 * ruc_loopback - handle UC and RC loopback requests 321 * @sqp: the sending QP 322 * 323 * This is called from hfi1_do_send() to 324 * forward a WQE addressed to the same HFI. 325 * Note that although we are single threaded due to the send engine, we still 326 * have to protect against post_send(). We don't have to worry about 327 * receive interrupts since this is a connected protocol and all packets 328 * will pass through here. 329 */ 330 static void ruc_loopback(struct rvt_qp *sqp) 331 { 332 struct hfi1_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num); 333 struct rvt_qp *qp; 334 struct rvt_swqe *wqe; 335 struct rvt_sge *sge; 336 unsigned long flags; 337 struct ib_wc wc; 338 u64 sdata; 339 atomic64_t *maddr; 340 enum ib_wc_status send_status; 341 bool release; 342 int ret; 343 bool copy_last = false; 344 int local_ops = 0; 345 346 rcu_read_lock(); 347 348 /* 349 * Note that we check the responder QP state after 350 * checking the requester's state. 351 */ 352 qp = rvt_lookup_qpn(ib_to_rvt(sqp->ibqp.device), &ibp->rvp, 353 sqp->remote_qpn); 354 355 spin_lock_irqsave(&sqp->s_lock, flags); 356 357 /* Return if we are already busy processing a work request. */ 358 if ((sqp->s_flags & (RVT_S_BUSY | RVT_S_ANY_WAIT)) || 359 !(ib_rvt_state_ops[sqp->state] & RVT_PROCESS_OR_FLUSH_SEND)) 360 goto unlock; 361 362 sqp->s_flags |= RVT_S_BUSY; 363 364 again: 365 if (sqp->s_last == READ_ONCE(sqp->s_head)) 366 goto clr_busy; 367 wqe = rvt_get_swqe_ptr(sqp, sqp->s_last); 368 369 /* Return if it is not OK to start a new work request. */ 370 if (!(ib_rvt_state_ops[sqp->state] & RVT_PROCESS_NEXT_SEND_OK)) { 371 if (!(ib_rvt_state_ops[sqp->state] & RVT_FLUSH_SEND)) 372 goto clr_busy; 373 /* We are in the error state, flush the work request. */ 374 send_status = IB_WC_WR_FLUSH_ERR; 375 goto flush_send; 376 } 377 378 /* 379 * We can rely on the entry not changing without the s_lock 380 * being held until we update s_last. 381 * We increment s_cur to indicate s_last is in progress. 382 */ 383 if (sqp->s_last == sqp->s_cur) { 384 if (++sqp->s_cur >= sqp->s_size) 385 sqp->s_cur = 0; 386 } 387 spin_unlock_irqrestore(&sqp->s_lock, flags); 388 389 if (!qp || !(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK) || 390 qp->ibqp.qp_type != sqp->ibqp.qp_type) { 391 ibp->rvp.n_pkt_drops++; 392 /* 393 * For RC, the requester would timeout and retry so 394 * shortcut the timeouts and just signal too many retries. 395 */ 396 if (sqp->ibqp.qp_type == IB_QPT_RC) 397 send_status = IB_WC_RETRY_EXC_ERR; 398 else 399 send_status = IB_WC_SUCCESS; 400 goto serr; 401 } 402 403 memset(&wc, 0, sizeof(wc)); 404 send_status = IB_WC_SUCCESS; 405 406 release = true; 407 sqp->s_sge.sge = wqe->sg_list[0]; 408 sqp->s_sge.sg_list = wqe->sg_list + 1; 409 sqp->s_sge.num_sge = wqe->wr.num_sge; 410 sqp->s_len = wqe->length; 411 switch (wqe->wr.opcode) { 412 case IB_WR_REG_MR: 413 goto send_comp; 414 415 case IB_WR_LOCAL_INV: 416 if (!(wqe->wr.send_flags & RVT_SEND_COMPLETION_ONLY)) { 417 if (rvt_invalidate_rkey(sqp, 418 wqe->wr.ex.invalidate_rkey)) 419 send_status = IB_WC_LOC_PROT_ERR; 420 local_ops = 1; 421 } 422 goto send_comp; 423 424 case IB_WR_SEND_WITH_INV: 425 if (!rvt_invalidate_rkey(qp, wqe->wr.ex.invalidate_rkey)) { 426 wc.wc_flags = IB_WC_WITH_INVALIDATE; 427 wc.ex.invalidate_rkey = wqe->wr.ex.invalidate_rkey; 428 } 429 goto send; 430 431 case IB_WR_SEND_WITH_IMM: 432 wc.wc_flags = IB_WC_WITH_IMM; 433 wc.ex.imm_data = wqe->wr.ex.imm_data; 434 /* FALLTHROUGH */ 435 case IB_WR_SEND: 436 send: 437 ret = hfi1_rvt_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 = hfi1_rvt_get_rwqe(qp, 1); 450 if (ret < 0) 451 goto op_err; 452 if (!ret) 453 goto rnr_nak; 454 /* skip copy_last set and qp_access_flags recheck */ 455 goto do_write; 456 case IB_WR_RDMA_WRITE: 457 copy_last = rvt_is_user_qp(qp); 458 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) 459 goto inv_err; 460 do_write: 461 if (wqe->length == 0) 462 break; 463 if (unlikely(!rvt_rkey_ok(qp, &qp->r_sge.sge, wqe->length, 464 wqe->rdma_wr.remote_addr, 465 wqe->rdma_wr.rkey, 466 IB_ACCESS_REMOTE_WRITE))) 467 goto acc_err; 468 qp->r_sge.sg_list = NULL; 469 qp->r_sge.num_sge = 1; 470 qp->r_sge.total_len = wqe->length; 471 break; 472 473 case IB_WR_RDMA_READ: 474 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ))) 475 goto inv_err; 476 if (unlikely(!rvt_rkey_ok(qp, &sqp->s_sge.sge, wqe->length, 477 wqe->rdma_wr.remote_addr, 478 wqe->rdma_wr.rkey, 479 IB_ACCESS_REMOTE_READ))) 480 goto acc_err; 481 release = false; 482 sqp->s_sge.sg_list = NULL; 483 sqp->s_sge.num_sge = 1; 484 qp->r_sge.sge = wqe->sg_list[0]; 485 qp->r_sge.sg_list = wqe->sg_list + 1; 486 qp->r_sge.num_sge = wqe->wr.num_sge; 487 qp->r_sge.total_len = wqe->length; 488 break; 489 490 case IB_WR_ATOMIC_CMP_AND_SWP: 491 case IB_WR_ATOMIC_FETCH_AND_ADD: 492 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) 493 goto inv_err; 494 if (unlikely(!rvt_rkey_ok(qp, &qp->r_sge.sge, sizeof(u64), 495 wqe->atomic_wr.remote_addr, 496 wqe->atomic_wr.rkey, 497 IB_ACCESS_REMOTE_ATOMIC))) 498 goto acc_err; 499 /* Perform atomic OP and save result. */ 500 maddr = (atomic64_t *)qp->r_sge.sge.vaddr; 501 sdata = wqe->atomic_wr.compare_add; 502 *(u64 *)sqp->s_sge.sge.vaddr = 503 (wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) ? 504 (u64)atomic64_add_return(sdata, maddr) - sdata : 505 (u64)cmpxchg((u64 *)qp->r_sge.sge.vaddr, 506 sdata, wqe->atomic_wr.swap); 507 rvt_put_mr(qp->r_sge.sge.mr); 508 qp->r_sge.num_sge = 0; 509 goto send_comp; 510 511 default: 512 send_status = IB_WC_LOC_QP_OP_ERR; 513 goto serr; 514 } 515 516 sge = &sqp->s_sge.sge; 517 while (sqp->s_len) { 518 u32 len = sqp->s_len; 519 520 if (len > sge->length) 521 len = sge->length; 522 if (len > sge->sge_length) 523 len = sge->sge_length; 524 WARN_ON_ONCE(len == 0); 525 hfi1_copy_sge(&qp->r_sge, sge->vaddr, len, release, copy_last); 526 sge->vaddr += len; 527 sge->length -= len; 528 sge->sge_length -= len; 529 if (sge->sge_length == 0) { 530 if (!release) 531 rvt_put_mr(sge->mr); 532 if (--sqp->s_sge.num_sge) 533 *sge = *sqp->s_sge.sg_list++; 534 } else if (sge->length == 0 && sge->mr->lkey) { 535 if (++sge->n >= RVT_SEGSZ) { 536 if (++sge->m >= sge->mr->mapsz) 537 break; 538 sge->n = 0; 539 } 540 sge->vaddr = 541 sge->mr->map[sge->m]->segs[sge->n].vaddr; 542 sge->length = 543 sge->mr->map[sge->m]->segs[sge->n].length; 544 } 545 sqp->s_len -= len; 546 } 547 if (release) 548 rvt_put_ss(&qp->r_sge); 549 550 if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags)) 551 goto send_comp; 552 553 if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM) 554 wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; 555 else 556 wc.opcode = IB_WC_RECV; 557 wc.wr_id = qp->r_wr_id; 558 wc.status = IB_WC_SUCCESS; 559 wc.byte_len = wqe->length; 560 wc.qp = &qp->ibqp; 561 wc.src_qp = qp->remote_qpn; 562 wc.slid = rdma_ah_get_dlid(&qp->remote_ah_attr) & U16_MAX; 563 wc.sl = rdma_ah_get_sl(&qp->remote_ah_attr); 564 wc.port_num = 1; 565 /* Signal completion event if the solicited bit is set. */ 566 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc, 567 wqe->wr.send_flags & IB_SEND_SOLICITED); 568 569 send_comp: 570 spin_lock_irqsave(&sqp->s_lock, flags); 571 ibp->rvp.n_loop_pkts++; 572 flush_send: 573 sqp->s_rnr_retry = sqp->s_rnr_retry_cnt; 574 hfi1_send_complete(sqp, wqe, send_status); 575 if (local_ops) { 576 atomic_dec(&sqp->local_ops_pending); 577 local_ops = 0; 578 } 579 goto again; 580 581 rnr_nak: 582 /* Handle RNR NAK */ 583 if (qp->ibqp.qp_type == IB_QPT_UC) 584 goto send_comp; 585 ibp->rvp.n_rnr_naks++; 586 /* 587 * Note: we don't need the s_lock held since the BUSY flag 588 * makes this single threaded. 589 */ 590 if (sqp->s_rnr_retry == 0) { 591 send_status = IB_WC_RNR_RETRY_EXC_ERR; 592 goto serr; 593 } 594 if (sqp->s_rnr_retry_cnt < 7) 595 sqp->s_rnr_retry--; 596 spin_lock_irqsave(&sqp->s_lock, flags); 597 if (!(ib_rvt_state_ops[sqp->state] & RVT_PROCESS_RECV_OK)) 598 goto clr_busy; 599 rvt_add_rnr_timer(sqp, qp->r_min_rnr_timer << 600 IB_AETH_CREDIT_SHIFT); 601 goto clr_busy; 602 603 op_err: 604 send_status = IB_WC_REM_OP_ERR; 605 wc.status = IB_WC_LOC_QP_OP_ERR; 606 goto err; 607 608 inv_err: 609 send_status = IB_WC_REM_INV_REQ_ERR; 610 wc.status = IB_WC_LOC_QP_OP_ERR; 611 goto err; 612 613 acc_err: 614 send_status = IB_WC_REM_ACCESS_ERR; 615 wc.status = IB_WC_LOC_PROT_ERR; 616 err: 617 /* responder goes to error state */ 618 rvt_rc_error(qp, wc.status); 619 620 serr: 621 spin_lock_irqsave(&sqp->s_lock, flags); 622 hfi1_send_complete(sqp, wqe, send_status); 623 if (sqp->ibqp.qp_type == IB_QPT_RC) { 624 int lastwqe = rvt_error_qp(sqp, IB_WC_WR_FLUSH_ERR); 625 626 sqp->s_flags &= ~RVT_S_BUSY; 627 spin_unlock_irqrestore(&sqp->s_lock, flags); 628 if (lastwqe) { 629 struct ib_event ev; 630 631 ev.device = sqp->ibqp.device; 632 ev.element.qp = &sqp->ibqp; 633 ev.event = IB_EVENT_QP_LAST_WQE_REACHED; 634 sqp->ibqp.event_handler(&ev, sqp->ibqp.qp_context); 635 } 636 goto done; 637 } 638 clr_busy: 639 sqp->s_flags &= ~RVT_S_BUSY; 640 unlock: 641 spin_unlock_irqrestore(&sqp->s_lock, flags); 642 done: 643 rcu_read_unlock(); 644 } 645 646 /** 647 * hfi1_make_grh - construct a GRH header 648 * @ibp: a pointer to the IB port 649 * @hdr: a pointer to the GRH header being constructed 650 * @grh: the global route address to send to 651 * @hwords: size of header after grh being sent in dwords 652 * @nwords: the number of 32 bit words of data being sent 653 * 654 * Return the size of the header in 32 bit words. 655 */ 656 u32 hfi1_make_grh(struct hfi1_ibport *ibp, struct ib_grh *hdr, 657 const struct ib_global_route *grh, u32 hwords, u32 nwords) 658 { 659 hdr->version_tclass_flow = 660 cpu_to_be32((IB_GRH_VERSION << IB_GRH_VERSION_SHIFT) | 661 (grh->traffic_class << IB_GRH_TCLASS_SHIFT) | 662 (grh->flow_label << IB_GRH_FLOW_SHIFT)); 663 hdr->paylen = cpu_to_be16((hwords + nwords) << 2); 664 /* next_hdr is defined by C8-7 in ch. 8.4.1 */ 665 hdr->next_hdr = IB_GRH_NEXT_HDR; 666 hdr->hop_limit = grh->hop_limit; 667 /* The SGID is 32-bit aligned. */ 668 hdr->sgid.global.subnet_prefix = ibp->rvp.gid_prefix; 669 hdr->sgid.global.interface_id = 670 grh->sgid_index < HFI1_GUIDS_PER_PORT ? 671 get_sguid(ibp, grh->sgid_index) : 672 get_sguid(ibp, HFI1_PORT_GUID_INDEX); 673 hdr->dgid = grh->dgid; 674 675 /* GRH header size in 32-bit words. */ 676 return sizeof(struct ib_grh) / sizeof(u32); 677 } 678 679 #define BTH2_OFFSET (offsetof(struct hfi1_sdma_header, \ 680 hdr.ibh.u.oth.bth[2]) / 4) 681 682 /** 683 * build_ahg - create ahg in s_ahg 684 * @qp: a pointer to QP 685 * @npsn: the next PSN for the request/response 686 * 687 * This routine handles the AHG by allocating an ahg entry and causing the 688 * copy of the first middle. 689 * 690 * Subsequent middles use the copied entry, editing the 691 * PSN with 1 or 2 edits. 692 */ 693 static inline void build_ahg(struct rvt_qp *qp, u32 npsn) 694 { 695 struct hfi1_qp_priv *priv = qp->priv; 696 697 if (unlikely(qp->s_flags & RVT_S_AHG_CLEAR)) 698 clear_ahg(qp); 699 if (!(qp->s_flags & RVT_S_AHG_VALID)) { 700 /* first middle that needs copy */ 701 if (qp->s_ahgidx < 0) 702 qp->s_ahgidx = sdma_ahg_alloc(priv->s_sde); 703 if (qp->s_ahgidx >= 0) { 704 qp->s_ahgpsn = npsn; 705 priv->s_ahg->tx_flags |= SDMA_TXREQ_F_AHG_COPY; 706 /* save to protect a change in another thread */ 707 priv->s_ahg->ahgidx = qp->s_ahgidx; 708 qp->s_flags |= RVT_S_AHG_VALID; 709 } 710 } else { 711 /* subsequent middle after valid */ 712 if (qp->s_ahgidx >= 0) { 713 priv->s_ahg->tx_flags |= SDMA_TXREQ_F_USE_AHG; 714 priv->s_ahg->ahgidx = qp->s_ahgidx; 715 priv->s_ahg->ahgcount++; 716 priv->s_ahg->ahgdesc[0] = 717 sdma_build_ahg_descriptor( 718 (__force u16)cpu_to_be16((u16)npsn), 719 BTH2_OFFSET, 720 16, 721 16); 722 if ((npsn & 0xffff0000) != 723 (qp->s_ahgpsn & 0xffff0000)) { 724 priv->s_ahg->ahgcount++; 725 priv->s_ahg->ahgdesc[1] = 726 sdma_build_ahg_descriptor( 727 (__force u16)cpu_to_be16( 728 (u16)(npsn >> 16)), 729 BTH2_OFFSET, 730 0, 731 16); 732 } 733 } 734 } 735 } 736 737 static inline void hfi1_make_ruc_bth(struct rvt_qp *qp, 738 struct ib_other_headers *ohdr, 739 u32 bth0, u32 bth1, u32 bth2) 740 { 741 bth1 |= qp->remote_qpn; 742 ohdr->bth[0] = cpu_to_be32(bth0); 743 ohdr->bth[1] = cpu_to_be32(bth1); 744 ohdr->bth[2] = cpu_to_be32(bth2); 745 } 746 747 static inline void hfi1_make_ruc_header_16B(struct rvt_qp *qp, 748 struct ib_other_headers *ohdr, 749 u32 bth0, u32 bth2, int middle, 750 struct hfi1_pkt_state *ps) 751 { 752 struct hfi1_qp_priv *priv = qp->priv; 753 struct hfi1_ibport *ibp = ps->ibp; 754 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); 755 u32 bth1 = 0; 756 u32 slid; 757 u16 pkey = hfi1_get_pkey(ibp, qp->s_pkey_index); 758 u8 l4 = OPA_16B_L4_IB_LOCAL; 759 u8 extra_bytes = hfi1_get_16b_padding((qp->s_hdrwords << 2), 760 ps->s_txreq->s_cur_size); 761 u32 nwords = SIZE_OF_CRC + ((ps->s_txreq->s_cur_size + 762 extra_bytes + SIZE_OF_LT) >> 2); 763 u8 becn = 0; 764 765 if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) && 766 hfi1_check_mcast(rdma_ah_get_dlid(&qp->remote_ah_attr))) { 767 struct ib_grh *grh; 768 struct ib_global_route *grd = 769 rdma_ah_retrieve_grh(&qp->remote_ah_attr); 770 int hdrwords; 771 772 /* 773 * Ensure OPA GIDs are transformed to IB gids 774 * before creating the GRH. 775 */ 776 if (grd->sgid_index == OPA_GID_INDEX) 777 grd->sgid_index = 0; 778 grh = &ps->s_txreq->phdr.hdr.opah.u.l.grh; 779 l4 = OPA_16B_L4_IB_GLOBAL; 780 hdrwords = qp->s_hdrwords - 4; 781 qp->s_hdrwords += hfi1_make_grh(ibp, grh, grd, 782 hdrwords, nwords); 783 middle = 0; 784 } 785 786 if (qp->s_mig_state == IB_MIG_MIGRATED) 787 bth1 |= OPA_BTH_MIG_REQ; 788 else 789 middle = 0; 790 791 if (middle) 792 build_ahg(qp, bth2); 793 else 794 qp->s_flags &= ~RVT_S_AHG_VALID; 795 796 bth0 |= pkey; 797 bth0 |= extra_bytes << 20; 798 if (qp->s_flags & RVT_S_ECN) { 799 qp->s_flags &= ~RVT_S_ECN; 800 /* we recently received a FECN, so return a BECN */ 801 becn = 1; 802 } 803 hfi1_make_ruc_bth(qp, ohdr, bth0, bth1, bth2); 804 805 if (!ppd->lid) 806 slid = be32_to_cpu(OPA_LID_PERMISSIVE); 807 else 808 slid = ppd->lid | 809 (rdma_ah_get_path_bits(&qp->remote_ah_attr) & 810 ((1 << ppd->lmc) - 1)); 811 812 hfi1_make_16b_hdr(&ps->s_txreq->phdr.hdr.opah, 813 slid, 814 opa_get_lid(rdma_ah_get_dlid(&qp->remote_ah_attr), 815 16B), 816 (qp->s_hdrwords + nwords) >> 1, 817 pkey, becn, 0, l4, priv->s_sc); 818 } 819 820 static inline void hfi1_make_ruc_header_9B(struct rvt_qp *qp, 821 struct ib_other_headers *ohdr, 822 u32 bth0, u32 bth2, int middle, 823 struct hfi1_pkt_state *ps) 824 { 825 struct hfi1_qp_priv *priv = qp->priv; 826 struct hfi1_ibport *ibp = ps->ibp; 827 u32 bth1 = 0; 828 u16 pkey = hfi1_get_pkey(ibp, qp->s_pkey_index); 829 u16 lrh0 = HFI1_LRH_BTH; 830 u8 extra_bytes = -ps->s_txreq->s_cur_size & 3; 831 u32 nwords = SIZE_OF_CRC + ((ps->s_txreq->s_cur_size + 832 extra_bytes) >> 2); 833 834 if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)) { 835 struct ib_grh *grh = &ps->s_txreq->phdr.hdr.ibh.u.l.grh; 836 int hdrwords = qp->s_hdrwords - 2; 837 838 lrh0 = HFI1_LRH_GRH; 839 qp->s_hdrwords += 840 hfi1_make_grh(ibp, grh, 841 rdma_ah_read_grh(&qp->remote_ah_attr), 842 hdrwords, nwords); 843 middle = 0; 844 } 845 lrh0 |= (priv->s_sc & 0xf) << 12 | 846 (rdma_ah_get_sl(&qp->remote_ah_attr) & 0xf) << 4; 847 848 if (qp->s_mig_state == IB_MIG_MIGRATED) 849 bth0 |= IB_BTH_MIG_REQ; 850 else 851 middle = 0; 852 853 if (middle) 854 build_ahg(qp, bth2); 855 else 856 qp->s_flags &= ~RVT_S_AHG_VALID; 857 858 bth0 |= pkey; 859 bth0 |= extra_bytes << 20; 860 if (qp->s_flags & RVT_S_ECN) { 861 qp->s_flags &= ~RVT_S_ECN; 862 /* we recently received a FECN, so return a BECN */ 863 bth1 |= (IB_BECN_MASK << IB_BECN_SHIFT); 864 } 865 hfi1_make_ruc_bth(qp, ohdr, bth0, bth1, bth2); 866 hfi1_make_ib_hdr(&ps->s_txreq->phdr.hdr.ibh, 867 lrh0, 868 qp->s_hdrwords + nwords, 869 opa_get_lid(rdma_ah_get_dlid(&qp->remote_ah_attr), 9B), 870 ppd_from_ibp(ibp)->lid | 871 rdma_ah_get_path_bits(&qp->remote_ah_attr)); 872 } 873 874 typedef void (*hfi1_make_ruc_hdr)(struct rvt_qp *qp, 875 struct ib_other_headers *ohdr, 876 u32 bth0, u32 bth2, int middle, 877 struct hfi1_pkt_state *ps); 878 879 /* We support only two types - 9B and 16B for now */ 880 static const hfi1_make_ruc_hdr hfi1_ruc_header_tbl[2] = { 881 [HFI1_PKT_TYPE_9B] = &hfi1_make_ruc_header_9B, 882 [HFI1_PKT_TYPE_16B] = &hfi1_make_ruc_header_16B 883 }; 884 885 void hfi1_make_ruc_header(struct rvt_qp *qp, struct ib_other_headers *ohdr, 886 u32 bth0, u32 bth2, int middle, 887 struct hfi1_pkt_state *ps) 888 { 889 struct hfi1_qp_priv *priv = qp->priv; 890 891 /* 892 * reset s_ahg/AHG fields 893 * 894 * This insures that the ahgentry/ahgcount 895 * are at a non-AHG default to protect 896 * build_verbs_tx_desc() from using 897 * an include ahgidx. 898 * 899 * build_ahg() will modify as appropriate 900 * to use the AHG feature. 901 */ 902 priv->s_ahg->tx_flags = 0; 903 priv->s_ahg->ahgcount = 0; 904 priv->s_ahg->ahgidx = 0; 905 906 /* Make the appropriate header */ 907 hfi1_ruc_header_tbl[priv->hdr_type](qp, ohdr, bth0, bth2, middle, ps); 908 } 909 910 /* when sending, force a reschedule every one of these periods */ 911 #define SEND_RESCHED_TIMEOUT (5 * HZ) /* 5s in jiffies */ 912 913 /** 914 * schedule_send_yield - test for a yield required for QP send engine 915 * @timeout: Final time for timeout slice for jiffies 916 * @qp: a pointer to QP 917 * @ps: a pointer to a structure with commonly lookup values for 918 * the the send engine progress 919 * 920 * This routine checks if the time slice for the QP has expired 921 * for RC QPs, if so an additional work entry is queued. At this 922 * point, other QPs have an opportunity to be scheduled. It 923 * returns true if a yield is required, otherwise, false 924 * is returned. 925 */ 926 static bool schedule_send_yield(struct rvt_qp *qp, 927 struct hfi1_pkt_state *ps) 928 { 929 ps->pkts_sent = true; 930 931 if (unlikely(time_after(jiffies, ps->timeout))) { 932 if (!ps->in_thread || 933 workqueue_congested(ps->cpu, ps->ppd->hfi1_wq)) { 934 spin_lock_irqsave(&qp->s_lock, ps->flags); 935 qp->s_flags &= ~RVT_S_BUSY; 936 hfi1_schedule_send(qp); 937 spin_unlock_irqrestore(&qp->s_lock, ps->flags); 938 this_cpu_inc(*ps->ppd->dd->send_schedule); 939 trace_hfi1_rc_expired_time_slice(qp, true); 940 return true; 941 } 942 943 cond_resched(); 944 this_cpu_inc(*ps->ppd->dd->send_schedule); 945 ps->timeout = jiffies + ps->timeout_int; 946 } 947 948 trace_hfi1_rc_expired_time_slice(qp, false); 949 return false; 950 } 951 952 void hfi1_do_send_from_rvt(struct rvt_qp *qp) 953 { 954 hfi1_do_send(qp, false); 955 } 956 957 void _hfi1_do_send(struct work_struct *work) 958 { 959 struct iowait *wait = container_of(work, struct iowait, iowork); 960 struct rvt_qp *qp = iowait_to_qp(wait); 961 962 hfi1_do_send(qp, true); 963 } 964 965 /** 966 * hfi1_do_send - perform a send on a QP 967 * @work: contains a pointer to the QP 968 * @in_thread: true if in a workqueue thread 969 * 970 * Process entries in the send work queue until credit or queue is 971 * exhausted. Only allow one CPU to send a packet per QP. 972 * Otherwise, two threads could send packets out of order. 973 */ 974 void hfi1_do_send(struct rvt_qp *qp, bool in_thread) 975 { 976 struct hfi1_pkt_state ps; 977 struct hfi1_qp_priv *priv = qp->priv; 978 int (*make_req)(struct rvt_qp *qp, struct hfi1_pkt_state *ps); 979 980 ps.dev = to_idev(qp->ibqp.device); 981 ps.ibp = to_iport(qp->ibqp.device, qp->port_num); 982 ps.ppd = ppd_from_ibp(ps.ibp); 983 ps.in_thread = in_thread; 984 985 trace_hfi1_rc_do_send(qp, in_thread); 986 987 switch (qp->ibqp.qp_type) { 988 case IB_QPT_RC: 989 if (!loopback && ((rdma_ah_get_dlid(&qp->remote_ah_attr) & 990 ~((1 << ps.ppd->lmc) - 1)) == 991 ps.ppd->lid)) { 992 ruc_loopback(qp); 993 return; 994 } 995 make_req = hfi1_make_rc_req; 996 ps.timeout_int = qp->timeout_jiffies; 997 break; 998 case IB_QPT_UC: 999 if (!loopback && ((rdma_ah_get_dlid(&qp->remote_ah_attr) & 1000 ~((1 << ps.ppd->lmc) - 1)) == 1001 ps.ppd->lid)) { 1002 ruc_loopback(qp); 1003 return; 1004 } 1005 make_req = hfi1_make_uc_req; 1006 ps.timeout_int = SEND_RESCHED_TIMEOUT; 1007 break; 1008 default: 1009 make_req = hfi1_make_ud_req; 1010 ps.timeout_int = SEND_RESCHED_TIMEOUT; 1011 } 1012 1013 spin_lock_irqsave(&qp->s_lock, ps.flags); 1014 1015 /* Return if we are already busy processing a work request. */ 1016 if (!hfi1_send_ok(qp)) { 1017 spin_unlock_irqrestore(&qp->s_lock, ps.flags); 1018 return; 1019 } 1020 1021 qp->s_flags |= RVT_S_BUSY; 1022 1023 ps.timeout_int = ps.timeout_int / 8; 1024 ps.timeout = jiffies + ps.timeout_int; 1025 ps.cpu = priv->s_sde ? priv->s_sde->cpu : 1026 cpumask_first(cpumask_of_node(ps.ppd->dd->node)); 1027 ps.pkts_sent = false; 1028 1029 /* insure a pre-built packet is handled */ 1030 ps.s_txreq = get_waiting_verbs_txreq(qp); 1031 do { 1032 /* Check for a constructed packet to be sent. */ 1033 if (qp->s_hdrwords != 0) { 1034 spin_unlock_irqrestore(&qp->s_lock, ps.flags); 1035 /* 1036 * If the packet cannot be sent now, return and 1037 * the send engine will be woken up later. 1038 */ 1039 if (hfi1_verbs_send(qp, &ps)) 1040 return; 1041 /* Record that s_ahg is empty. */ 1042 qp->s_hdrwords = 0; 1043 /* allow other tasks to run */ 1044 if (schedule_send_yield(qp, &ps)) 1045 return; 1046 1047 spin_lock_irqsave(&qp->s_lock, ps.flags); 1048 } 1049 } while (make_req(qp, &ps)); 1050 iowait_starve_clear(ps.pkts_sent, &priv->s_iowait); 1051 spin_unlock_irqrestore(&qp->s_lock, ps.flags); 1052 } 1053 1054 /* 1055 * This should be called with s_lock held. 1056 */ 1057 void hfi1_send_complete(struct rvt_qp *qp, struct rvt_swqe *wqe, 1058 enum ib_wc_status status) 1059 { 1060 u32 old_last, last; 1061 1062 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_OR_FLUSH_SEND)) 1063 return; 1064 1065 last = qp->s_last; 1066 old_last = last; 1067 trace_hfi1_qp_send_completion(qp, wqe, last); 1068 if (++last >= qp->s_size) 1069 last = 0; 1070 trace_hfi1_qp_send_completion(qp, wqe, last); 1071 qp->s_last = last; 1072 /* See post_send() */ 1073 barrier(); 1074 rvt_put_swqe(wqe); 1075 if (qp->ibqp.qp_type == IB_QPT_UD || 1076 qp->ibqp.qp_type == IB_QPT_SMI || 1077 qp->ibqp.qp_type == IB_QPT_GSI) 1078 atomic_dec(&ibah_to_rvtah(wqe->ud_wr.ah)->refcount); 1079 1080 rvt_qp_swqe_complete(qp, 1081 wqe, 1082 ib_hfi1_wc_opcode[wqe->wr.opcode], 1083 status); 1084 1085 if (qp->s_acked == old_last) 1086 qp->s_acked = last; 1087 if (qp->s_cur == old_last) 1088 qp->s_cur = last; 1089 if (qp->s_tail == old_last) 1090 qp->s_tail = last; 1091 if (qp->state == IB_QPS_SQD && last == qp->s_cur) 1092 qp->s_draining = 0; 1093 } 1094