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 smp_read_barrier_depends(); /* see post_one_send() */ 366 if (sqp->s_last == READ_ONCE(sqp->s_head)) 367 goto clr_busy; 368 wqe = rvt_get_swqe_ptr(sqp, sqp->s_last); 369 370 /* Return if it is not OK to start a new work request. */ 371 if (!(ib_rvt_state_ops[sqp->state] & RVT_PROCESS_NEXT_SEND_OK)) { 372 if (!(ib_rvt_state_ops[sqp->state] & RVT_FLUSH_SEND)) 373 goto clr_busy; 374 /* We are in the error state, flush the work request. */ 375 send_status = IB_WC_WR_FLUSH_ERR; 376 goto flush_send; 377 } 378 379 /* 380 * We can rely on the entry not changing without the s_lock 381 * being held until we update s_last. 382 * We increment s_cur to indicate s_last is in progress. 383 */ 384 if (sqp->s_last == sqp->s_cur) { 385 if (++sqp->s_cur >= sqp->s_size) 386 sqp->s_cur = 0; 387 } 388 spin_unlock_irqrestore(&sqp->s_lock, flags); 389 390 if (!qp || !(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK) || 391 qp->ibqp.qp_type != sqp->ibqp.qp_type) { 392 ibp->rvp.n_pkt_drops++; 393 /* 394 * For RC, the requester would timeout and retry so 395 * shortcut the timeouts and just signal too many retries. 396 */ 397 if (sqp->ibqp.qp_type == IB_QPT_RC) 398 send_status = IB_WC_RETRY_EXC_ERR; 399 else 400 send_status = IB_WC_SUCCESS; 401 goto serr; 402 } 403 404 memset(&wc, 0, sizeof(wc)); 405 send_status = IB_WC_SUCCESS; 406 407 release = true; 408 sqp->s_sge.sge = wqe->sg_list[0]; 409 sqp->s_sge.sg_list = wqe->sg_list + 1; 410 sqp->s_sge.num_sge = wqe->wr.num_sge; 411 sqp->s_len = wqe->length; 412 switch (wqe->wr.opcode) { 413 case IB_WR_REG_MR: 414 goto send_comp; 415 416 case IB_WR_LOCAL_INV: 417 if (!(wqe->wr.send_flags & RVT_SEND_COMPLETION_ONLY)) { 418 if (rvt_invalidate_rkey(sqp, 419 wqe->wr.ex.invalidate_rkey)) 420 send_status = IB_WC_LOC_PROT_ERR; 421 local_ops = 1; 422 } 423 goto send_comp; 424 425 case IB_WR_SEND_WITH_INV: 426 if (!rvt_invalidate_rkey(qp, wqe->wr.ex.invalidate_rkey)) { 427 wc.wc_flags = IB_WC_WITH_INVALIDATE; 428 wc.ex.invalidate_rkey = wqe->wr.ex.invalidate_rkey; 429 } 430 goto send; 431 432 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 send: 438 ret = hfi1_rvt_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 = hfi1_rvt_get_rwqe(qp, 1); 451 if (ret < 0) 452 goto op_err; 453 if (!ret) 454 goto rnr_nak; 455 /* skip copy_last set and qp_access_flags recheck */ 456 goto do_write; 457 case IB_WR_RDMA_WRITE: 458 copy_last = rvt_is_user_qp(qp); 459 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) 460 goto inv_err; 461 do_write: 462 if (wqe->length == 0) 463 break; 464 if (unlikely(!rvt_rkey_ok(qp, &qp->r_sge.sge, wqe->length, 465 wqe->rdma_wr.remote_addr, 466 wqe->rdma_wr.rkey, 467 IB_ACCESS_REMOTE_WRITE))) 468 goto acc_err; 469 qp->r_sge.sg_list = NULL; 470 qp->r_sge.num_sge = 1; 471 qp->r_sge.total_len = wqe->length; 472 break; 473 474 case IB_WR_RDMA_READ: 475 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ))) 476 goto inv_err; 477 if (unlikely(!rvt_rkey_ok(qp, &sqp->s_sge.sge, wqe->length, 478 wqe->rdma_wr.remote_addr, 479 wqe->rdma_wr.rkey, 480 IB_ACCESS_REMOTE_READ))) 481 goto acc_err; 482 release = false; 483 sqp->s_sge.sg_list = NULL; 484 sqp->s_sge.num_sge = 1; 485 qp->r_sge.sge = wqe->sg_list[0]; 486 qp->r_sge.sg_list = wqe->sg_list + 1; 487 qp->r_sge.num_sge = wqe->wr.num_sge; 488 qp->r_sge.total_len = wqe->length; 489 break; 490 491 case IB_WR_ATOMIC_CMP_AND_SWP: 492 case IB_WR_ATOMIC_FETCH_AND_ADD: 493 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) 494 goto inv_err; 495 if (unlikely(!rvt_rkey_ok(qp, &qp->r_sge.sge, sizeof(u64), 496 wqe->atomic_wr.remote_addr, 497 wqe->atomic_wr.rkey, 498 IB_ACCESS_REMOTE_ATOMIC))) 499 goto acc_err; 500 /* Perform atomic OP and save result. */ 501 maddr = (atomic64_t *)qp->r_sge.sge.vaddr; 502 sdata = wqe->atomic_wr.compare_add; 503 *(u64 *)sqp->s_sge.sge.vaddr = 504 (wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) ? 505 (u64)atomic64_add_return(sdata, maddr) - sdata : 506 (u64)cmpxchg((u64 *)qp->r_sge.sge.vaddr, 507 sdata, wqe->atomic_wr.swap); 508 rvt_put_mr(qp->r_sge.sge.mr); 509 qp->r_sge.num_sge = 0; 510 goto send_comp; 511 512 default: 513 send_status = IB_WC_LOC_QP_OP_ERR; 514 goto serr; 515 } 516 517 sge = &sqp->s_sge.sge; 518 while (sqp->s_len) { 519 u32 len = sqp->s_len; 520 521 if (len > sge->length) 522 len = sge->length; 523 if (len > sge->sge_length) 524 len = sge->sge_length; 525 WARN_ON_ONCE(len == 0); 526 hfi1_copy_sge(&qp->r_sge, sge->vaddr, len, release, copy_last); 527 sge->vaddr += len; 528 sge->length -= len; 529 sge->sge_length -= len; 530 if (sge->sge_length == 0) { 531 if (!release) 532 rvt_put_mr(sge->mr); 533 if (--sqp->s_sge.num_sge) 534 *sge = *sqp->s_sge.sg_list++; 535 } else if (sge->length == 0 && sge->mr->lkey) { 536 if (++sge->n >= RVT_SEGSZ) { 537 if (++sge->m >= sge->mr->mapsz) 538 break; 539 sge->n = 0; 540 } 541 sge->vaddr = 542 sge->mr->map[sge->m]->segs[sge->n].vaddr; 543 sge->length = 544 sge->mr->map[sge->m]->segs[sge->n].length; 545 } 546 sqp->s_len -= len; 547 } 548 if (release) 549 rvt_put_ss(&qp->r_sge); 550 551 if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags)) 552 goto send_comp; 553 554 if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM) 555 wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; 556 else 557 wc.opcode = IB_WC_RECV; 558 wc.wr_id = qp->r_wr_id; 559 wc.status = IB_WC_SUCCESS; 560 wc.byte_len = wqe->length; 561 wc.qp = &qp->ibqp; 562 wc.src_qp = qp->remote_qpn; 563 wc.slid = rdma_ah_get_dlid(&qp->remote_ah_attr) & U16_MAX; 564 wc.sl = rdma_ah_get_sl(&qp->remote_ah_attr); 565 wc.port_num = 1; 566 /* Signal completion event if the solicited bit is set. */ 567 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc, 568 wqe->wr.send_flags & IB_SEND_SOLICITED); 569 570 send_comp: 571 spin_lock_irqsave(&sqp->s_lock, flags); 572 ibp->rvp.n_loop_pkts++; 573 flush_send: 574 sqp->s_rnr_retry = sqp->s_rnr_retry_cnt; 575 hfi1_send_complete(sqp, wqe, send_status); 576 if (local_ops) { 577 atomic_dec(&sqp->local_ops_pending); 578 local_ops = 0; 579 } 580 goto again; 581 582 rnr_nak: 583 /* Handle RNR NAK */ 584 if (qp->ibqp.qp_type == IB_QPT_UC) 585 goto send_comp; 586 ibp->rvp.n_rnr_naks++; 587 /* 588 * Note: we don't need the s_lock held since the BUSY flag 589 * makes this single threaded. 590 */ 591 if (sqp->s_rnr_retry == 0) { 592 send_status = IB_WC_RNR_RETRY_EXC_ERR; 593 goto serr; 594 } 595 if (sqp->s_rnr_retry_cnt < 7) 596 sqp->s_rnr_retry--; 597 spin_lock_irqsave(&sqp->s_lock, flags); 598 if (!(ib_rvt_state_ops[sqp->state] & RVT_PROCESS_RECV_OK)) 599 goto clr_busy; 600 rvt_add_rnr_timer(sqp, qp->r_min_rnr_timer << 601 IB_AETH_CREDIT_SHIFT); 602 goto clr_busy; 603 604 op_err: 605 send_status = IB_WC_REM_OP_ERR; 606 wc.status = IB_WC_LOC_QP_OP_ERR; 607 goto err; 608 609 inv_err: 610 send_status = IB_WC_REM_INV_REQ_ERR; 611 wc.status = IB_WC_LOC_QP_OP_ERR; 612 goto err; 613 614 acc_err: 615 send_status = IB_WC_REM_ACCESS_ERR; 616 wc.status = IB_WC_LOC_PROT_ERR; 617 err: 618 /* responder goes to error state */ 619 rvt_rc_error(qp, wc.status); 620 621 serr: 622 spin_lock_irqsave(&sqp->s_lock, flags); 623 hfi1_send_complete(sqp, wqe, send_status); 624 if (sqp->ibqp.qp_type == IB_QPT_RC) { 625 int lastwqe = rvt_error_qp(sqp, IB_WC_WR_FLUSH_ERR); 626 627 sqp->s_flags &= ~RVT_S_BUSY; 628 spin_unlock_irqrestore(&sqp->s_lock, flags); 629 if (lastwqe) { 630 struct ib_event ev; 631 632 ev.device = sqp->ibqp.device; 633 ev.element.qp = &sqp->ibqp; 634 ev.event = IB_EVENT_QP_LAST_WQE_REACHED; 635 sqp->ibqp.event_handler(&ev, sqp->ibqp.qp_context); 636 } 637 goto done; 638 } 639 clr_busy: 640 sqp->s_flags &= ~RVT_S_BUSY; 641 unlock: 642 spin_unlock_irqrestore(&sqp->s_lock, flags); 643 done: 644 rcu_read_unlock(); 645 } 646 647 /** 648 * hfi1_make_grh - construct a GRH header 649 * @ibp: a pointer to the IB port 650 * @hdr: a pointer to the GRH header being constructed 651 * @grh: the global route address to send to 652 * @hwords: size of header after grh being sent in dwords 653 * @nwords: the number of 32 bit words of data being sent 654 * 655 * Return the size of the header in 32 bit words. 656 */ 657 u32 hfi1_make_grh(struct hfi1_ibport *ibp, struct ib_grh *hdr, 658 const struct ib_global_route *grh, u32 hwords, u32 nwords) 659 { 660 hdr->version_tclass_flow = 661 cpu_to_be32((IB_GRH_VERSION << IB_GRH_VERSION_SHIFT) | 662 (grh->traffic_class << IB_GRH_TCLASS_SHIFT) | 663 (grh->flow_label << IB_GRH_FLOW_SHIFT)); 664 hdr->paylen = cpu_to_be16((hwords + nwords) << 2); 665 /* next_hdr is defined by C8-7 in ch. 8.4.1 */ 666 hdr->next_hdr = IB_GRH_NEXT_HDR; 667 hdr->hop_limit = grh->hop_limit; 668 /* The SGID is 32-bit aligned. */ 669 hdr->sgid.global.subnet_prefix = ibp->rvp.gid_prefix; 670 hdr->sgid.global.interface_id = 671 grh->sgid_index < HFI1_GUIDS_PER_PORT ? 672 get_sguid(ibp, grh->sgid_index) : 673 get_sguid(ibp, HFI1_PORT_GUID_INDEX); 674 hdr->dgid = grh->dgid; 675 676 /* GRH header size in 32-bit words. */ 677 return sizeof(struct ib_grh) / sizeof(u32); 678 } 679 680 #define BTH2_OFFSET (offsetof(struct hfi1_sdma_header, \ 681 hdr.ibh.u.oth.bth[2]) / 4) 682 683 /** 684 * build_ahg - create ahg in s_ahg 685 * @qp: a pointer to QP 686 * @npsn: the next PSN for the request/response 687 * 688 * This routine handles the AHG by allocating an ahg entry and causing the 689 * copy of the first middle. 690 * 691 * Subsequent middles use the copied entry, editing the 692 * PSN with 1 or 2 edits. 693 */ 694 static inline void build_ahg(struct rvt_qp *qp, u32 npsn) 695 { 696 struct hfi1_qp_priv *priv = qp->priv; 697 698 if (unlikely(qp->s_flags & RVT_S_AHG_CLEAR)) 699 clear_ahg(qp); 700 if (!(qp->s_flags & RVT_S_AHG_VALID)) { 701 /* first middle that needs copy */ 702 if (qp->s_ahgidx < 0) 703 qp->s_ahgidx = sdma_ahg_alloc(priv->s_sde); 704 if (qp->s_ahgidx >= 0) { 705 qp->s_ahgpsn = npsn; 706 priv->s_ahg->tx_flags |= SDMA_TXREQ_F_AHG_COPY; 707 /* save to protect a change in another thread */ 708 priv->s_ahg->ahgidx = qp->s_ahgidx; 709 qp->s_flags |= RVT_S_AHG_VALID; 710 } 711 } else { 712 /* subsequent middle after valid */ 713 if (qp->s_ahgidx >= 0) { 714 priv->s_ahg->tx_flags |= SDMA_TXREQ_F_USE_AHG; 715 priv->s_ahg->ahgidx = qp->s_ahgidx; 716 priv->s_ahg->ahgcount++; 717 priv->s_ahg->ahgdesc[0] = 718 sdma_build_ahg_descriptor( 719 (__force u16)cpu_to_be16((u16)npsn), 720 BTH2_OFFSET, 721 16, 722 16); 723 if ((npsn & 0xffff0000) != 724 (qp->s_ahgpsn & 0xffff0000)) { 725 priv->s_ahg->ahgcount++; 726 priv->s_ahg->ahgdesc[1] = 727 sdma_build_ahg_descriptor( 728 (__force u16)cpu_to_be16( 729 (u16)(npsn >> 16)), 730 BTH2_OFFSET, 731 0, 732 16); 733 } 734 } 735 } 736 } 737 738 static inline void hfi1_make_ruc_bth(struct rvt_qp *qp, 739 struct ib_other_headers *ohdr, 740 u32 bth0, u32 bth1, u32 bth2) 741 { 742 bth1 |= qp->remote_qpn; 743 ohdr->bth[0] = cpu_to_be32(bth0); 744 ohdr->bth[1] = cpu_to_be32(bth1); 745 ohdr->bth[2] = cpu_to_be32(bth2); 746 } 747 748 static inline void hfi1_make_ruc_header_16B(struct rvt_qp *qp, 749 struct ib_other_headers *ohdr, 750 u32 bth0, u32 bth2, int middle, 751 struct hfi1_pkt_state *ps) 752 { 753 struct hfi1_qp_priv *priv = qp->priv; 754 struct hfi1_ibport *ibp = ps->ibp; 755 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); 756 u32 bth1 = 0; 757 u32 slid; 758 u16 pkey = hfi1_get_pkey(ibp, qp->s_pkey_index); 759 u8 l4 = OPA_16B_L4_IB_LOCAL; 760 u8 extra_bytes = hfi1_get_16b_padding((qp->s_hdrwords << 2), 761 ps->s_txreq->s_cur_size); 762 u32 nwords = SIZE_OF_CRC + ((ps->s_txreq->s_cur_size + 763 extra_bytes + SIZE_OF_LT) >> 2); 764 u8 becn = 0; 765 766 if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) && 767 hfi1_check_mcast(rdma_ah_get_dlid(&qp->remote_ah_attr))) { 768 struct ib_grh *grh; 769 struct ib_global_route *grd = 770 rdma_ah_retrieve_grh(&qp->remote_ah_attr); 771 int hdrwords; 772 773 /* 774 * Ensure OPA GIDs are transformed to IB gids 775 * before creating the GRH. 776 */ 777 if (grd->sgid_index == OPA_GID_INDEX) 778 grd->sgid_index = 0; 779 grh = &ps->s_txreq->phdr.hdr.opah.u.l.grh; 780 l4 = OPA_16B_L4_IB_GLOBAL; 781 hdrwords = qp->s_hdrwords - 4; 782 qp->s_hdrwords += hfi1_make_grh(ibp, grh, grd, 783 hdrwords, nwords); 784 middle = 0; 785 } 786 787 if (qp->s_mig_state == IB_MIG_MIGRATED) 788 bth1 |= OPA_BTH_MIG_REQ; 789 else 790 middle = 0; 791 792 if (middle) 793 build_ahg(qp, bth2); 794 else 795 qp->s_flags &= ~RVT_S_AHG_VALID; 796 797 bth0 |= pkey; 798 bth0 |= extra_bytes << 20; 799 if (qp->s_flags & RVT_S_ECN) { 800 qp->s_flags &= ~RVT_S_ECN; 801 /* we recently received a FECN, so return a BECN */ 802 becn = 1; 803 } 804 hfi1_make_ruc_bth(qp, ohdr, bth0, bth1, bth2); 805 806 if (!ppd->lid) 807 slid = be32_to_cpu(OPA_LID_PERMISSIVE); 808 else 809 slid = ppd->lid | 810 (rdma_ah_get_path_bits(&qp->remote_ah_attr) & 811 ((1 << ppd->lmc) - 1)); 812 813 hfi1_make_16b_hdr(&ps->s_txreq->phdr.hdr.opah, 814 slid, 815 opa_get_lid(rdma_ah_get_dlid(&qp->remote_ah_attr), 816 16B), 817 (qp->s_hdrwords + nwords) >> 1, 818 pkey, becn, 0, l4, priv->s_sc); 819 } 820 821 static inline void hfi1_make_ruc_header_9B(struct rvt_qp *qp, 822 struct ib_other_headers *ohdr, 823 u32 bth0, u32 bth2, int middle, 824 struct hfi1_pkt_state *ps) 825 { 826 struct hfi1_qp_priv *priv = qp->priv; 827 struct hfi1_ibport *ibp = ps->ibp; 828 u32 bth1 = 0; 829 u16 pkey = hfi1_get_pkey(ibp, qp->s_pkey_index); 830 u16 lrh0 = HFI1_LRH_BTH; 831 u8 extra_bytes = -ps->s_txreq->s_cur_size & 3; 832 u32 nwords = SIZE_OF_CRC + ((ps->s_txreq->s_cur_size + 833 extra_bytes) >> 2); 834 835 if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)) { 836 struct ib_grh *grh = &ps->s_txreq->phdr.hdr.ibh.u.l.grh; 837 int hdrwords = qp->s_hdrwords - 2; 838 839 lrh0 = HFI1_LRH_GRH; 840 qp->s_hdrwords += 841 hfi1_make_grh(ibp, grh, 842 rdma_ah_read_grh(&qp->remote_ah_attr), 843 hdrwords, nwords); 844 middle = 0; 845 } 846 lrh0 |= (priv->s_sc & 0xf) << 12 | 847 (rdma_ah_get_sl(&qp->remote_ah_attr) & 0xf) << 4; 848 849 if (qp->s_mig_state == IB_MIG_MIGRATED) 850 bth0 |= IB_BTH_MIG_REQ; 851 else 852 middle = 0; 853 854 if (middle) 855 build_ahg(qp, bth2); 856 else 857 qp->s_flags &= ~RVT_S_AHG_VALID; 858 859 bth0 |= pkey; 860 bth0 |= extra_bytes << 20; 861 if (qp->s_flags & RVT_S_ECN) { 862 qp->s_flags &= ~RVT_S_ECN; 863 /* we recently received a FECN, so return a BECN */ 864 bth1 |= (IB_BECN_MASK << IB_BECN_SHIFT); 865 } 866 hfi1_make_ruc_bth(qp, ohdr, bth0, bth1, bth2); 867 hfi1_make_ib_hdr(&ps->s_txreq->phdr.hdr.ibh, 868 lrh0, 869 qp->s_hdrwords + nwords, 870 opa_get_lid(rdma_ah_get_dlid(&qp->remote_ah_attr), 9B), 871 ppd_from_ibp(ibp)->lid | 872 rdma_ah_get_path_bits(&qp->remote_ah_attr)); 873 } 874 875 typedef void (*hfi1_make_ruc_hdr)(struct rvt_qp *qp, 876 struct ib_other_headers *ohdr, 877 u32 bth0, u32 bth2, int middle, 878 struct hfi1_pkt_state *ps); 879 880 /* We support only two types - 9B and 16B for now */ 881 static const hfi1_make_ruc_hdr hfi1_ruc_header_tbl[2] = { 882 [HFI1_PKT_TYPE_9B] = &hfi1_make_ruc_header_9B, 883 [HFI1_PKT_TYPE_16B] = &hfi1_make_ruc_header_16B 884 }; 885 886 void hfi1_make_ruc_header(struct rvt_qp *qp, struct ib_other_headers *ohdr, 887 u32 bth0, u32 bth2, int middle, 888 struct hfi1_pkt_state *ps) 889 { 890 struct hfi1_qp_priv *priv = qp->priv; 891 892 /* 893 * reset s_ahg/AHG fields 894 * 895 * This insures that the ahgentry/ahgcount 896 * are at a non-AHG default to protect 897 * build_verbs_tx_desc() from using 898 * an include ahgidx. 899 * 900 * build_ahg() will modify as appropriate 901 * to use the AHG feature. 902 */ 903 priv->s_ahg->tx_flags = 0; 904 priv->s_ahg->ahgcount = 0; 905 priv->s_ahg->ahgidx = 0; 906 907 /* Make the appropriate header */ 908 hfi1_ruc_header_tbl[priv->hdr_type](qp, ohdr, bth0, bth2, middle, ps); 909 } 910 911 /* when sending, force a reschedule every one of these periods */ 912 #define SEND_RESCHED_TIMEOUT (5 * HZ) /* 5s in jiffies */ 913 914 /** 915 * schedule_send_yield - test for a yield required for QP send engine 916 * @timeout: Final time for timeout slice for jiffies 917 * @qp: a pointer to QP 918 * @ps: a pointer to a structure with commonly lookup values for 919 * the the send engine progress 920 * 921 * This routine checks if the time slice for the QP has expired 922 * for RC QPs, if so an additional work entry is queued. At this 923 * point, other QPs have an opportunity to be scheduled. It 924 * returns true if a yield is required, otherwise, false 925 * is returned. 926 */ 927 static bool schedule_send_yield(struct rvt_qp *qp, 928 struct hfi1_pkt_state *ps) 929 { 930 ps->pkts_sent = true; 931 932 if (unlikely(time_after(jiffies, ps->timeout))) { 933 if (!ps->in_thread || 934 workqueue_congested(ps->cpu, ps->ppd->hfi1_wq)) { 935 spin_lock_irqsave(&qp->s_lock, ps->flags); 936 qp->s_flags &= ~RVT_S_BUSY; 937 hfi1_schedule_send(qp); 938 spin_unlock_irqrestore(&qp->s_lock, ps->flags); 939 this_cpu_inc(*ps->ppd->dd->send_schedule); 940 trace_hfi1_rc_expired_time_slice(qp, true); 941 return true; 942 } 943 944 cond_resched(); 945 this_cpu_inc(*ps->ppd->dd->send_schedule); 946 ps->timeout = jiffies + ps->timeout_int; 947 } 948 949 trace_hfi1_rc_expired_time_slice(qp, false); 950 return false; 951 } 952 953 void hfi1_do_send_from_rvt(struct rvt_qp *qp) 954 { 955 hfi1_do_send(qp, false); 956 } 957 958 void _hfi1_do_send(struct work_struct *work) 959 { 960 struct iowait *wait = container_of(work, struct iowait, iowork); 961 struct rvt_qp *qp = iowait_to_qp(wait); 962 963 hfi1_do_send(qp, true); 964 } 965 966 /** 967 * hfi1_do_send - perform a send on a QP 968 * @work: contains a pointer to the QP 969 * @in_thread: true if in a workqueue thread 970 * 971 * Process entries in the send work queue until credit or queue is 972 * exhausted. Only allow one CPU to send a packet per QP. 973 * Otherwise, two threads could send packets out of order. 974 */ 975 void hfi1_do_send(struct rvt_qp *qp, bool in_thread) 976 { 977 struct hfi1_pkt_state ps; 978 struct hfi1_qp_priv *priv = qp->priv; 979 int (*make_req)(struct rvt_qp *qp, struct hfi1_pkt_state *ps); 980 981 ps.dev = to_idev(qp->ibqp.device); 982 ps.ibp = to_iport(qp->ibqp.device, qp->port_num); 983 ps.ppd = ppd_from_ibp(ps.ibp); 984 ps.in_thread = in_thread; 985 986 trace_hfi1_rc_do_send(qp, in_thread); 987 988 switch (qp->ibqp.qp_type) { 989 case IB_QPT_RC: 990 if (!loopback && ((rdma_ah_get_dlid(&qp->remote_ah_attr) & 991 ~((1 << ps.ppd->lmc) - 1)) == 992 ps.ppd->lid)) { 993 ruc_loopback(qp); 994 return; 995 } 996 make_req = hfi1_make_rc_req; 997 ps.timeout_int = qp->timeout_jiffies; 998 break; 999 case IB_QPT_UC: 1000 if (!loopback && ((rdma_ah_get_dlid(&qp->remote_ah_attr) & 1001 ~((1 << ps.ppd->lmc) - 1)) == 1002 ps.ppd->lid)) { 1003 ruc_loopback(qp); 1004 return; 1005 } 1006 make_req = hfi1_make_uc_req; 1007 ps.timeout_int = SEND_RESCHED_TIMEOUT; 1008 break; 1009 default: 1010 make_req = hfi1_make_ud_req; 1011 ps.timeout_int = SEND_RESCHED_TIMEOUT; 1012 } 1013 1014 spin_lock_irqsave(&qp->s_lock, ps.flags); 1015 1016 /* Return if we are already busy processing a work request. */ 1017 if (!hfi1_send_ok(qp)) { 1018 spin_unlock_irqrestore(&qp->s_lock, ps.flags); 1019 return; 1020 } 1021 1022 qp->s_flags |= RVT_S_BUSY; 1023 1024 ps.timeout_int = ps.timeout_int / 8; 1025 ps.timeout = jiffies + ps.timeout_int; 1026 ps.cpu = priv->s_sde ? priv->s_sde->cpu : 1027 cpumask_first(cpumask_of_node(ps.ppd->dd->node)); 1028 ps.pkts_sent = false; 1029 1030 /* insure a pre-built packet is handled */ 1031 ps.s_txreq = get_waiting_verbs_txreq(qp); 1032 do { 1033 /* Check for a constructed packet to be sent. */ 1034 if (qp->s_hdrwords != 0) { 1035 spin_unlock_irqrestore(&qp->s_lock, ps.flags); 1036 /* 1037 * If the packet cannot be sent now, return and 1038 * the send engine will be woken up later. 1039 */ 1040 if (hfi1_verbs_send(qp, &ps)) 1041 return; 1042 /* Record that s_ahg is empty. */ 1043 qp->s_hdrwords = 0; 1044 /* allow other tasks to run */ 1045 if (schedule_send_yield(qp, &ps)) 1046 return; 1047 1048 spin_lock_irqsave(&qp->s_lock, ps.flags); 1049 } 1050 } while (make_req(qp, &ps)); 1051 iowait_starve_clear(ps.pkts_sent, &priv->s_iowait); 1052 spin_unlock_irqrestore(&qp->s_lock, ps.flags); 1053 } 1054 1055 /* 1056 * This should be called with s_lock held. 1057 */ 1058 void hfi1_send_complete(struct rvt_qp *qp, struct rvt_swqe *wqe, 1059 enum ib_wc_status status) 1060 { 1061 u32 old_last, last; 1062 1063 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_OR_FLUSH_SEND)) 1064 return; 1065 1066 last = qp->s_last; 1067 old_last = last; 1068 trace_hfi1_qp_send_completion(qp, wqe, last); 1069 if (++last >= qp->s_size) 1070 last = 0; 1071 trace_hfi1_qp_send_completion(qp, wqe, last); 1072 qp->s_last = last; 1073 /* See post_send() */ 1074 barrier(); 1075 rvt_put_swqe(wqe); 1076 if (qp->ibqp.qp_type == IB_QPT_UD || 1077 qp->ibqp.qp_type == IB_QPT_SMI || 1078 qp->ibqp.qp_type == IB_QPT_GSI) 1079 atomic_dec(&ibah_to_rvtah(wqe->ud_wr.ah)->refcount); 1080 1081 rvt_qp_swqe_complete(qp, 1082 wqe, 1083 ib_hfi1_wc_opcode[wqe->wr.opcode], 1084 status); 1085 1086 if (qp->s_acked == old_last) 1087 qp->s_acked = last; 1088 if (qp->s_cur == old_last) 1089 qp->s_cur = last; 1090 if (qp->s_tail == old_last) 1091 qp->s_tail = last; 1092 if (qp->state == IB_QPS_SQD && last == qp->s_cur) 1093 qp->s_draining = 0; 1094 } 1095