1 /* 2 * Copyright(c) 2015, 2016 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 * Convert the AETH RNR timeout code into the number of microseconds. 58 */ 59 const u32 ib_hfi1_rnr_table[32] = { 60 655360, /* 00: 655.36 */ 61 10, /* 01: .01 */ 62 20, /* 02 .02 */ 63 30, /* 03: .03 */ 64 40, /* 04: .04 */ 65 60, /* 05: .06 */ 66 80, /* 06: .08 */ 67 120, /* 07: .12 */ 68 160, /* 08: .16 */ 69 240, /* 09: .24 */ 70 320, /* 0A: .32 */ 71 480, /* 0B: .48 */ 72 640, /* 0C: .64 */ 73 960, /* 0D: .96 */ 74 1280, /* 0E: 1.28 */ 75 1920, /* 0F: 1.92 */ 76 2560, /* 10: 2.56 */ 77 3840, /* 11: 3.84 */ 78 5120, /* 12: 5.12 */ 79 7680, /* 13: 7.68 */ 80 10240, /* 14: 10.24 */ 81 15360, /* 15: 15.36 */ 82 20480, /* 16: 20.48 */ 83 30720, /* 17: 30.72 */ 84 40960, /* 18: 40.96 */ 85 61440, /* 19: 61.44 */ 86 81920, /* 1A: 81.92 */ 87 122880, /* 1B: 122.88 */ 88 163840, /* 1C: 163.84 */ 89 245760, /* 1D: 245.76 */ 90 327680, /* 1E: 327.68 */ 91 491520 /* 1F: 491.52 */ 92 }; 93 94 /* 95 * Validate a RWQE and fill in the SGE state. 96 * Return 1 if OK. 97 */ 98 static int init_sge(struct rvt_qp *qp, struct rvt_rwqe *wqe) 99 { 100 int i, j, ret; 101 struct ib_wc wc; 102 struct rvt_lkey_table *rkt; 103 struct rvt_pd *pd; 104 struct rvt_sge_state *ss; 105 106 rkt = &to_idev(qp->ibqp.device)->rdi.lkey_table; 107 pd = ibpd_to_rvtpd(qp->ibqp.srq ? qp->ibqp.srq->pd : qp->ibqp.pd); 108 ss = &qp->r_sge; 109 ss->sg_list = qp->r_sg_list; 110 qp->r_len = 0; 111 for (i = j = 0; i < wqe->num_sge; i++) { 112 if (wqe->sg_list[i].length == 0) 113 continue; 114 /* Check LKEY */ 115 if (!rvt_lkey_ok(rkt, pd, j ? &ss->sg_list[j - 1] : &ss->sge, 116 &wqe->sg_list[i], IB_ACCESS_LOCAL_WRITE)) 117 goto bad_lkey; 118 qp->r_len += wqe->sg_list[i].length; 119 j++; 120 } 121 ss->num_sge = j; 122 ss->total_len = qp->r_len; 123 ret = 1; 124 goto bail; 125 126 bad_lkey: 127 while (j) { 128 struct rvt_sge *sge = --j ? &ss->sg_list[j - 1] : &ss->sge; 129 130 rvt_put_mr(sge->mr); 131 } 132 ss->num_sge = 0; 133 memset(&wc, 0, sizeof(wc)); 134 wc.wr_id = wqe->wr_id; 135 wc.status = IB_WC_LOC_PROT_ERR; 136 wc.opcode = IB_WC_RECV; 137 wc.qp = &qp->ibqp; 138 /* Signal solicited completion event. */ 139 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc, 1); 140 ret = 0; 141 bail: 142 return ret; 143 } 144 145 /** 146 * hfi1_rvt_get_rwqe - copy the next RWQE into the QP's RWQE 147 * @qp: the QP 148 * @wr_id_only: update qp->r_wr_id only, not qp->r_sge 149 * 150 * Return -1 if there is a local error, 0 if no RWQE is available, 151 * otherwise return 1. 152 * 153 * Can be called from interrupt level. 154 */ 155 int hfi1_rvt_get_rwqe(struct rvt_qp *qp, int wr_id_only) 156 { 157 unsigned long flags; 158 struct rvt_rq *rq; 159 struct rvt_rwq *wq; 160 struct rvt_srq *srq; 161 struct rvt_rwqe *wqe; 162 void (*handler)(struct ib_event *, void *); 163 u32 tail; 164 int ret; 165 166 if (qp->ibqp.srq) { 167 srq = ibsrq_to_rvtsrq(qp->ibqp.srq); 168 handler = srq->ibsrq.event_handler; 169 rq = &srq->rq; 170 } else { 171 srq = NULL; 172 handler = NULL; 173 rq = &qp->r_rq; 174 } 175 176 spin_lock_irqsave(&rq->lock, flags); 177 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) { 178 ret = 0; 179 goto unlock; 180 } 181 182 wq = rq->wq; 183 tail = wq->tail; 184 /* Validate tail before using it since it is user writable. */ 185 if (tail >= rq->size) 186 tail = 0; 187 if (unlikely(tail == wq->head)) { 188 ret = 0; 189 goto unlock; 190 } 191 /* Make sure entry is read after head index is read. */ 192 smp_rmb(); 193 wqe = rvt_get_rwqe_ptr(rq, tail); 194 /* 195 * Even though we update the tail index in memory, the verbs 196 * consumer is not supposed to post more entries until a 197 * completion is generated. 198 */ 199 if (++tail >= rq->size) 200 tail = 0; 201 wq->tail = tail; 202 if (!wr_id_only && !init_sge(qp, wqe)) { 203 ret = -1; 204 goto unlock; 205 } 206 qp->r_wr_id = wqe->wr_id; 207 208 ret = 1; 209 set_bit(RVT_R_WRID_VALID, &qp->r_aflags); 210 if (handler) { 211 u32 n; 212 213 /* 214 * Validate head pointer value and compute 215 * the number of remaining WQEs. 216 */ 217 n = wq->head; 218 if (n >= rq->size) 219 n = 0; 220 if (n < tail) 221 n += rq->size - tail; 222 else 223 n -= tail; 224 if (n < srq->limit) { 225 struct ib_event ev; 226 227 srq->limit = 0; 228 spin_unlock_irqrestore(&rq->lock, flags); 229 ev.device = qp->ibqp.device; 230 ev.element.srq = qp->ibqp.srq; 231 ev.event = IB_EVENT_SRQ_LIMIT_REACHED; 232 handler(&ev, srq->ibsrq.srq_context); 233 goto bail; 234 } 235 } 236 unlock: 237 spin_unlock_irqrestore(&rq->lock, flags); 238 bail: 239 return ret; 240 } 241 242 static __be64 get_sguid(struct hfi1_ibport *ibp, unsigned index) 243 { 244 if (!index) { 245 struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); 246 247 return cpu_to_be64(ppd->guid); 248 } 249 return ibp->guids[index - 1]; 250 } 251 252 static int gid_ok(union ib_gid *gid, __be64 gid_prefix, __be64 id) 253 { 254 return (gid->global.interface_id == id && 255 (gid->global.subnet_prefix == gid_prefix || 256 gid->global.subnet_prefix == IB_DEFAULT_GID_PREFIX)); 257 } 258 259 /* 260 * 261 * This should be called with the QP r_lock held. 262 * 263 * The s_lock will be acquired around the hfi1_migrate_qp() call. 264 */ 265 int hfi1_ruc_check_hdr(struct hfi1_ibport *ibp, struct hfi1_ib_header *hdr, 266 int has_grh, struct rvt_qp *qp, u32 bth0) 267 { 268 __be64 guid; 269 unsigned long flags; 270 u8 sc5 = ibp->sl_to_sc[qp->remote_ah_attr.sl]; 271 272 if (qp->s_mig_state == IB_MIG_ARMED && (bth0 & IB_BTH_MIG_REQ)) { 273 if (!has_grh) { 274 if (qp->alt_ah_attr.ah_flags & IB_AH_GRH) 275 goto err; 276 } else { 277 if (!(qp->alt_ah_attr.ah_flags & IB_AH_GRH)) 278 goto err; 279 guid = get_sguid(ibp, qp->alt_ah_attr.grh.sgid_index); 280 if (!gid_ok(&hdr->u.l.grh.dgid, ibp->rvp.gid_prefix, 281 guid)) 282 goto err; 283 if (!gid_ok( 284 &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 (unlikely(rcv_pkey_check(ppd_from_ibp(ibp), (u16)bth0, 290 sc5, be16_to_cpu(hdr->lrh[3])))) { 291 hfi1_bad_pqkey(ibp, OPA_TRAP_BAD_P_KEY, 292 (u16)bth0, 293 (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF, 294 0, qp->ibqp.qp_num, 295 be16_to_cpu(hdr->lrh[3]), 296 be16_to_cpu(hdr->lrh[1])); 297 goto err; 298 } 299 /* Validate the SLID. See Ch. 9.6.1.5 and 17.2.8 */ 300 if (be16_to_cpu(hdr->lrh[3]) != qp->alt_ah_attr.dlid || 301 ppd_from_ibp(ibp)->port != qp->alt_ah_attr.port_num) 302 goto err; 303 spin_lock_irqsave(&qp->s_lock, flags); 304 hfi1_migrate_qp(qp); 305 spin_unlock_irqrestore(&qp->s_lock, flags); 306 } else { 307 if (!has_grh) { 308 if (qp->remote_ah_attr.ah_flags & IB_AH_GRH) 309 goto err; 310 } else { 311 if (!(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) 312 goto err; 313 guid = get_sguid(ibp, 314 qp->remote_ah_attr.grh.sgid_index); 315 if (!gid_ok(&hdr->u.l.grh.dgid, ibp->rvp.gid_prefix, 316 guid)) 317 goto err; 318 if (!gid_ok( 319 &hdr->u.l.grh.sgid, 320 qp->remote_ah_attr.grh.dgid.global.subnet_prefix, 321 qp->remote_ah_attr.grh.dgid.global.interface_id)) 322 goto err; 323 } 324 if (unlikely(rcv_pkey_check(ppd_from_ibp(ibp), (u16)bth0, 325 sc5, be16_to_cpu(hdr->lrh[3])))) { 326 hfi1_bad_pqkey(ibp, OPA_TRAP_BAD_P_KEY, 327 (u16)bth0, 328 (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF, 329 0, qp->ibqp.qp_num, 330 be16_to_cpu(hdr->lrh[3]), 331 be16_to_cpu(hdr->lrh[1])); 332 goto err; 333 } 334 /* Validate the SLID. See Ch. 9.6.1.5 */ 335 if (be16_to_cpu(hdr->lrh[3]) != qp->remote_ah_attr.dlid || 336 ppd_from_ibp(ibp)->port != qp->port_num) 337 goto err; 338 if (qp->s_mig_state == IB_MIG_REARM && 339 !(bth0 & IB_BTH_MIG_REQ)) 340 qp->s_mig_state = IB_MIG_ARMED; 341 } 342 343 return 0; 344 345 err: 346 return 1; 347 } 348 349 /** 350 * ruc_loopback - handle UC and RC loopback requests 351 * @sqp: the sending QP 352 * 353 * This is called from hfi1_do_send() to 354 * forward a WQE addressed to the same HFI. 355 * Note that although we are single threaded due to the tasklet, we still 356 * have to protect against post_send(). We don't have to worry about 357 * receive interrupts since this is a connected protocol and all packets 358 * will pass through here. 359 */ 360 static void ruc_loopback(struct rvt_qp *sqp) 361 { 362 struct hfi1_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num); 363 struct rvt_qp *qp; 364 struct rvt_swqe *wqe; 365 struct rvt_sge *sge; 366 unsigned long flags; 367 struct ib_wc wc; 368 u64 sdata; 369 atomic64_t *maddr; 370 enum ib_wc_status send_status; 371 int release; 372 int ret; 373 int copy_last = 0; 374 u32 to; 375 int local_ops = 0; 376 377 rcu_read_lock(); 378 379 /* 380 * Note that we check the responder QP state after 381 * checking the requester's state. 382 */ 383 qp = rvt_lookup_qpn(ib_to_rvt(sqp->ibqp.device), &ibp->rvp, 384 sqp->remote_qpn); 385 386 spin_lock_irqsave(&sqp->s_lock, flags); 387 388 /* Return if we are already busy processing a work request. */ 389 if ((sqp->s_flags & (RVT_S_BUSY | RVT_S_ANY_WAIT)) || 390 !(ib_rvt_state_ops[sqp->state] & RVT_PROCESS_OR_FLUSH_SEND)) 391 goto unlock; 392 393 sqp->s_flags |= RVT_S_BUSY; 394 395 again: 396 smp_read_barrier_depends(); /* see post_one_send() */ 397 if (sqp->s_last == ACCESS_ONCE(sqp->s_head)) 398 goto clr_busy; 399 wqe = rvt_get_swqe_ptr(sqp, sqp->s_last); 400 401 /* Return if it is not OK to start a new work request. */ 402 if (!(ib_rvt_state_ops[sqp->state] & RVT_PROCESS_NEXT_SEND_OK)) { 403 if (!(ib_rvt_state_ops[sqp->state] & RVT_FLUSH_SEND)) 404 goto clr_busy; 405 /* We are in the error state, flush the work request. */ 406 send_status = IB_WC_WR_FLUSH_ERR; 407 goto flush_send; 408 } 409 410 /* 411 * We can rely on the entry not changing without the s_lock 412 * being held until we update s_last. 413 * We increment s_cur to indicate s_last is in progress. 414 */ 415 if (sqp->s_last == sqp->s_cur) { 416 if (++sqp->s_cur >= sqp->s_size) 417 sqp->s_cur = 0; 418 } 419 spin_unlock_irqrestore(&sqp->s_lock, flags); 420 421 if (!qp || !(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK) || 422 qp->ibqp.qp_type != sqp->ibqp.qp_type) { 423 ibp->rvp.n_pkt_drops++; 424 /* 425 * For RC, the requester would timeout and retry so 426 * shortcut the timeouts and just signal too many retries. 427 */ 428 if (sqp->ibqp.qp_type == IB_QPT_RC) 429 send_status = IB_WC_RETRY_EXC_ERR; 430 else 431 send_status = IB_WC_SUCCESS; 432 goto serr; 433 } 434 435 memset(&wc, 0, sizeof(wc)); 436 send_status = IB_WC_SUCCESS; 437 438 release = 1; 439 sqp->s_sge.sge = wqe->sg_list[0]; 440 sqp->s_sge.sg_list = wqe->sg_list + 1; 441 sqp->s_sge.num_sge = wqe->wr.num_sge; 442 sqp->s_len = wqe->length; 443 switch (wqe->wr.opcode) { 444 case IB_WR_REG_MR: 445 goto send_comp; 446 447 case IB_WR_LOCAL_INV: 448 if (!(wqe->wr.send_flags & RVT_SEND_COMPLETION_ONLY)) { 449 if (rvt_invalidate_rkey(sqp, 450 wqe->wr.ex.invalidate_rkey)) 451 send_status = IB_WC_LOC_PROT_ERR; 452 local_ops = 1; 453 } 454 goto send_comp; 455 456 case IB_WR_SEND_WITH_INV: 457 if (!rvt_invalidate_rkey(qp, wqe->wr.ex.invalidate_rkey)) { 458 wc.wc_flags = IB_WC_WITH_INVALIDATE; 459 wc.ex.invalidate_rkey = wqe->wr.ex.invalidate_rkey; 460 } 461 goto send; 462 463 case IB_WR_SEND_WITH_IMM: 464 wc.wc_flags = IB_WC_WITH_IMM; 465 wc.ex.imm_data = wqe->wr.ex.imm_data; 466 /* FALLTHROUGH */ 467 case IB_WR_SEND: 468 send: 469 ret = hfi1_rvt_get_rwqe(qp, 0); 470 if (ret < 0) 471 goto op_err; 472 if (!ret) 473 goto rnr_nak; 474 break; 475 476 case IB_WR_RDMA_WRITE_WITH_IMM: 477 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) 478 goto inv_err; 479 wc.wc_flags = IB_WC_WITH_IMM; 480 wc.ex.imm_data = wqe->wr.ex.imm_data; 481 ret = hfi1_rvt_get_rwqe(qp, 1); 482 if (ret < 0) 483 goto op_err; 484 if (!ret) 485 goto rnr_nak; 486 /* skip copy_last set and qp_access_flags recheck */ 487 goto do_write; 488 case IB_WR_RDMA_WRITE: 489 copy_last = ibpd_to_rvtpd(qp->ibqp.pd)->user; 490 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) 491 goto inv_err; 492 do_write: 493 if (wqe->length == 0) 494 break; 495 if (unlikely(!rvt_rkey_ok(qp, &qp->r_sge.sge, wqe->length, 496 wqe->rdma_wr.remote_addr, 497 wqe->rdma_wr.rkey, 498 IB_ACCESS_REMOTE_WRITE))) 499 goto acc_err; 500 qp->r_sge.sg_list = NULL; 501 qp->r_sge.num_sge = 1; 502 qp->r_sge.total_len = wqe->length; 503 break; 504 505 case IB_WR_RDMA_READ: 506 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ))) 507 goto inv_err; 508 if (unlikely(!rvt_rkey_ok(qp, &sqp->s_sge.sge, wqe->length, 509 wqe->rdma_wr.remote_addr, 510 wqe->rdma_wr.rkey, 511 IB_ACCESS_REMOTE_READ))) 512 goto acc_err; 513 release = 0; 514 sqp->s_sge.sg_list = NULL; 515 sqp->s_sge.num_sge = 1; 516 qp->r_sge.sge = wqe->sg_list[0]; 517 qp->r_sge.sg_list = wqe->sg_list + 1; 518 qp->r_sge.num_sge = wqe->wr.num_sge; 519 qp->r_sge.total_len = wqe->length; 520 break; 521 522 case IB_WR_ATOMIC_CMP_AND_SWP: 523 case IB_WR_ATOMIC_FETCH_AND_ADD: 524 if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) 525 goto inv_err; 526 if (unlikely(!rvt_rkey_ok(qp, &qp->r_sge.sge, sizeof(u64), 527 wqe->atomic_wr.remote_addr, 528 wqe->atomic_wr.rkey, 529 IB_ACCESS_REMOTE_ATOMIC))) 530 goto acc_err; 531 /* Perform atomic OP and save result. */ 532 maddr = (atomic64_t *)qp->r_sge.sge.vaddr; 533 sdata = wqe->atomic_wr.compare_add; 534 *(u64 *)sqp->s_sge.sge.vaddr = 535 (wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) ? 536 (u64)atomic64_add_return(sdata, maddr) - sdata : 537 (u64)cmpxchg((u64 *)qp->r_sge.sge.vaddr, 538 sdata, wqe->atomic_wr.swap); 539 rvt_put_mr(qp->r_sge.sge.mr); 540 qp->r_sge.num_sge = 0; 541 goto send_comp; 542 543 default: 544 send_status = IB_WC_LOC_QP_OP_ERR; 545 goto serr; 546 } 547 548 sge = &sqp->s_sge.sge; 549 while (sqp->s_len) { 550 u32 len = sqp->s_len; 551 552 if (len > sge->length) 553 len = sge->length; 554 if (len > sge->sge_length) 555 len = sge->sge_length; 556 WARN_ON_ONCE(len == 0); 557 hfi1_copy_sge(&qp->r_sge, sge->vaddr, len, release, copy_last); 558 sge->vaddr += len; 559 sge->length -= len; 560 sge->sge_length -= len; 561 if (sge->sge_length == 0) { 562 if (!release) 563 rvt_put_mr(sge->mr); 564 if (--sqp->s_sge.num_sge) 565 *sge = *sqp->s_sge.sg_list++; 566 } else if (sge->length == 0 && sge->mr->lkey) { 567 if (++sge->n >= RVT_SEGSZ) { 568 if (++sge->m >= sge->mr->mapsz) 569 break; 570 sge->n = 0; 571 } 572 sge->vaddr = 573 sge->mr->map[sge->m]->segs[sge->n].vaddr; 574 sge->length = 575 sge->mr->map[sge->m]->segs[sge->n].length; 576 } 577 sqp->s_len -= len; 578 } 579 if (release) 580 rvt_put_ss(&qp->r_sge); 581 582 if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags)) 583 goto send_comp; 584 585 if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM) 586 wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; 587 else 588 wc.opcode = IB_WC_RECV; 589 wc.wr_id = qp->r_wr_id; 590 wc.status = IB_WC_SUCCESS; 591 wc.byte_len = wqe->length; 592 wc.qp = &qp->ibqp; 593 wc.src_qp = qp->remote_qpn; 594 wc.slid = qp->remote_ah_attr.dlid; 595 wc.sl = qp->remote_ah_attr.sl; 596 wc.port_num = 1; 597 /* Signal completion event if the solicited bit is set. */ 598 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc, 599 wqe->wr.send_flags & IB_SEND_SOLICITED); 600 601 send_comp: 602 spin_lock_irqsave(&sqp->s_lock, flags); 603 ibp->rvp.n_loop_pkts++; 604 flush_send: 605 sqp->s_rnr_retry = sqp->s_rnr_retry_cnt; 606 hfi1_send_complete(sqp, wqe, send_status); 607 if (local_ops) { 608 atomic_dec(&sqp->local_ops_pending); 609 local_ops = 0; 610 } 611 goto again; 612 613 rnr_nak: 614 /* Handle RNR NAK */ 615 if (qp->ibqp.qp_type == IB_QPT_UC) 616 goto send_comp; 617 ibp->rvp.n_rnr_naks++; 618 /* 619 * Note: we don't need the s_lock held since the BUSY flag 620 * makes this single threaded. 621 */ 622 if (sqp->s_rnr_retry == 0) { 623 send_status = IB_WC_RNR_RETRY_EXC_ERR; 624 goto serr; 625 } 626 if (sqp->s_rnr_retry_cnt < 7) 627 sqp->s_rnr_retry--; 628 spin_lock_irqsave(&sqp->s_lock, flags); 629 if (!(ib_rvt_state_ops[sqp->state] & RVT_PROCESS_RECV_OK)) 630 goto clr_busy; 631 to = ib_hfi1_rnr_table[qp->r_min_rnr_timer]; 632 hfi1_add_rnr_timer(sqp, to); 633 goto clr_busy; 634 635 op_err: 636 send_status = IB_WC_REM_OP_ERR; 637 wc.status = IB_WC_LOC_QP_OP_ERR; 638 goto err; 639 640 inv_err: 641 send_status = IB_WC_REM_INV_REQ_ERR; 642 wc.status = IB_WC_LOC_QP_OP_ERR; 643 goto err; 644 645 acc_err: 646 send_status = IB_WC_REM_ACCESS_ERR; 647 wc.status = IB_WC_LOC_PROT_ERR; 648 err: 649 /* responder goes to error state */ 650 hfi1_rc_error(qp, wc.status); 651 652 serr: 653 spin_lock_irqsave(&sqp->s_lock, flags); 654 hfi1_send_complete(sqp, wqe, send_status); 655 if (sqp->ibqp.qp_type == IB_QPT_RC) { 656 int lastwqe = rvt_error_qp(sqp, IB_WC_WR_FLUSH_ERR); 657 658 sqp->s_flags &= ~RVT_S_BUSY; 659 spin_unlock_irqrestore(&sqp->s_lock, flags); 660 if (lastwqe) { 661 struct ib_event ev; 662 663 ev.device = sqp->ibqp.device; 664 ev.element.qp = &sqp->ibqp; 665 ev.event = IB_EVENT_QP_LAST_WQE_REACHED; 666 sqp->ibqp.event_handler(&ev, sqp->ibqp.qp_context); 667 } 668 goto done; 669 } 670 clr_busy: 671 sqp->s_flags &= ~RVT_S_BUSY; 672 unlock: 673 spin_unlock_irqrestore(&sqp->s_lock, flags); 674 done: 675 rcu_read_unlock(); 676 } 677 678 /** 679 * hfi1_make_grh - construct a GRH header 680 * @ibp: a pointer to the IB port 681 * @hdr: a pointer to the GRH header being constructed 682 * @grh: the global route address to send to 683 * @hwords: the number of 32 bit words of header being sent 684 * @nwords: the number of 32 bit words of data being sent 685 * 686 * Return the size of the header in 32 bit words. 687 */ 688 u32 hfi1_make_grh(struct hfi1_ibport *ibp, struct ib_grh *hdr, 689 struct ib_global_route *grh, u32 hwords, u32 nwords) 690 { 691 hdr->version_tclass_flow = 692 cpu_to_be32((IB_GRH_VERSION << IB_GRH_VERSION_SHIFT) | 693 (grh->traffic_class << IB_GRH_TCLASS_SHIFT) | 694 (grh->flow_label << IB_GRH_FLOW_SHIFT)); 695 hdr->paylen = cpu_to_be16((hwords - 2 + nwords + SIZE_OF_CRC) << 2); 696 /* next_hdr is defined by C8-7 in ch. 8.4.1 */ 697 hdr->next_hdr = IB_GRH_NEXT_HDR; 698 hdr->hop_limit = grh->hop_limit; 699 /* The SGID is 32-bit aligned. */ 700 hdr->sgid.global.subnet_prefix = ibp->rvp.gid_prefix; 701 hdr->sgid.global.interface_id = 702 grh->sgid_index && grh->sgid_index < ARRAY_SIZE(ibp->guids) ? 703 ibp->guids[grh->sgid_index - 1] : 704 cpu_to_be64(ppd_from_ibp(ibp)->guid); 705 hdr->dgid = grh->dgid; 706 707 /* GRH header size in 32-bit words. */ 708 return sizeof(struct ib_grh) / sizeof(u32); 709 } 710 711 #define BTH2_OFFSET (offsetof(struct hfi1_sdma_header, hdr.u.oth.bth[2]) / 4) 712 713 /** 714 * build_ahg - create ahg in s_ahg 715 * @qp: a pointer to QP 716 * @npsn: the next PSN for the request/response 717 * 718 * This routine handles the AHG by allocating an ahg entry and causing the 719 * copy of the first middle. 720 * 721 * Subsequent middles use the copied entry, editing the 722 * PSN with 1 or 2 edits. 723 */ 724 static inline void build_ahg(struct rvt_qp *qp, u32 npsn) 725 { 726 struct hfi1_qp_priv *priv = qp->priv; 727 728 if (unlikely(qp->s_flags & RVT_S_AHG_CLEAR)) 729 clear_ahg(qp); 730 if (!(qp->s_flags & RVT_S_AHG_VALID)) { 731 /* first middle that needs copy */ 732 if (qp->s_ahgidx < 0) 733 qp->s_ahgidx = sdma_ahg_alloc(priv->s_sde); 734 if (qp->s_ahgidx >= 0) { 735 qp->s_ahgpsn = npsn; 736 priv->s_ahg->tx_flags |= SDMA_TXREQ_F_AHG_COPY; 737 /* save to protect a change in another thread */ 738 priv->s_ahg->ahgidx = qp->s_ahgidx; 739 qp->s_flags |= RVT_S_AHG_VALID; 740 } 741 } else { 742 /* subsequent middle after valid */ 743 if (qp->s_ahgidx >= 0) { 744 priv->s_ahg->tx_flags |= SDMA_TXREQ_F_USE_AHG; 745 priv->s_ahg->ahgidx = qp->s_ahgidx; 746 priv->s_ahg->ahgcount++; 747 priv->s_ahg->ahgdesc[0] = 748 sdma_build_ahg_descriptor( 749 (__force u16)cpu_to_be16((u16)npsn), 750 BTH2_OFFSET, 751 16, 752 16); 753 if ((npsn & 0xffff0000) != 754 (qp->s_ahgpsn & 0xffff0000)) { 755 priv->s_ahg->ahgcount++; 756 priv->s_ahg->ahgdesc[1] = 757 sdma_build_ahg_descriptor( 758 (__force u16)cpu_to_be16( 759 (u16)(npsn >> 16)), 760 BTH2_OFFSET, 761 0, 762 16); 763 } 764 } 765 } 766 } 767 768 void hfi1_make_ruc_header(struct rvt_qp *qp, struct hfi1_other_headers *ohdr, 769 u32 bth0, u32 bth2, int middle, 770 struct hfi1_pkt_state *ps) 771 { 772 struct hfi1_qp_priv *priv = qp->priv; 773 struct hfi1_ibport *ibp = ps->ibp; 774 u16 lrh0; 775 u32 nwords; 776 u32 extra_bytes; 777 u32 bth1; 778 779 /* Construct the header. */ 780 extra_bytes = -qp->s_cur_size & 3; 781 nwords = (qp->s_cur_size + extra_bytes) >> 2; 782 lrh0 = HFI1_LRH_BTH; 783 if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) { 784 qp->s_hdrwords += hfi1_make_grh(ibp, 785 &ps->s_txreq->phdr.hdr.u.l.grh, 786 &qp->remote_ah_attr.grh, 787 qp->s_hdrwords, nwords); 788 lrh0 = HFI1_LRH_GRH; 789 middle = 0; 790 } 791 lrh0 |= (priv->s_sc & 0xf) << 12 | (qp->remote_ah_attr.sl & 0xf) << 4; 792 /* 793 * reset s_ahg/AHG fields 794 * 795 * This insures that the ahgentry/ahgcount 796 * are at a non-AHG default to protect 797 * build_verbs_tx_desc() from using 798 * an include ahgidx. 799 * 800 * build_ahg() will modify as appropriate 801 * to use the AHG feature. 802 */ 803 priv->s_ahg->tx_flags = 0; 804 priv->s_ahg->ahgcount = 0; 805 priv->s_ahg->ahgidx = 0; 806 if (qp->s_mig_state == IB_MIG_MIGRATED) 807 bth0 |= IB_BTH_MIG_REQ; 808 else 809 middle = 0; 810 if (middle) 811 build_ahg(qp, bth2); 812 else 813 qp->s_flags &= ~RVT_S_AHG_VALID; 814 ps->s_txreq->phdr.hdr.lrh[0] = cpu_to_be16(lrh0); 815 ps->s_txreq->phdr.hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid); 816 ps->s_txreq->phdr.hdr.lrh[2] = 817 cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC); 818 ps->s_txreq->phdr.hdr.lrh[3] = cpu_to_be16(ppd_from_ibp(ibp)->lid | 819 qp->remote_ah_attr.src_path_bits); 820 bth0 |= hfi1_get_pkey(ibp, qp->s_pkey_index); 821 bth0 |= extra_bytes << 20; 822 ohdr->bth[0] = cpu_to_be32(bth0); 823 bth1 = qp->remote_qpn; 824 if (qp->s_flags & RVT_S_ECN) { 825 qp->s_flags &= ~RVT_S_ECN; 826 /* we recently received a FECN, so return a BECN */ 827 bth1 |= (HFI1_BECN_MASK << HFI1_BECN_SHIFT); 828 } 829 ohdr->bth[1] = cpu_to_be32(bth1); 830 ohdr->bth[2] = cpu_to_be32(bth2); 831 } 832 833 /* when sending, force a reschedule every one of these periods */ 834 #define SEND_RESCHED_TIMEOUT (5 * HZ) /* 5s in jiffies */ 835 836 void _hfi1_do_send(struct work_struct *work) 837 { 838 struct iowait *wait = container_of(work, struct iowait, iowork); 839 struct rvt_qp *qp = iowait_to_qp(wait); 840 841 hfi1_do_send(qp); 842 } 843 844 /** 845 * hfi1_do_send - perform a send on a QP 846 * @work: contains a pointer to the QP 847 * 848 * Process entries in the send work queue until credit or queue is 849 * exhausted. Only allow one CPU to send a packet per QP (tasklet). 850 * Otherwise, two threads could send packets out of order. 851 */ 852 void hfi1_do_send(struct rvt_qp *qp) 853 { 854 struct hfi1_pkt_state ps; 855 struct hfi1_qp_priv *priv = qp->priv; 856 int (*make_req)(struct rvt_qp *qp, struct hfi1_pkt_state *ps); 857 unsigned long timeout; 858 unsigned long timeout_int; 859 int cpu; 860 861 ps.dev = to_idev(qp->ibqp.device); 862 ps.ibp = to_iport(qp->ibqp.device, qp->port_num); 863 ps.ppd = ppd_from_ibp(ps.ibp); 864 865 switch (qp->ibqp.qp_type) { 866 case IB_QPT_RC: 867 if (!loopback && ((qp->remote_ah_attr.dlid & ~((1 << ps.ppd->lmc 868 ) - 1)) == 869 ps.ppd->lid)) { 870 ruc_loopback(qp); 871 return; 872 } 873 make_req = hfi1_make_rc_req; 874 timeout_int = (qp->timeout_jiffies); 875 break; 876 case IB_QPT_UC: 877 if (!loopback && ((qp->remote_ah_attr.dlid & ~((1 << ps.ppd->lmc 878 ) - 1)) == 879 ps.ppd->lid)) { 880 ruc_loopback(qp); 881 return; 882 } 883 make_req = hfi1_make_uc_req; 884 timeout_int = SEND_RESCHED_TIMEOUT; 885 break; 886 default: 887 make_req = hfi1_make_ud_req; 888 timeout_int = SEND_RESCHED_TIMEOUT; 889 } 890 891 spin_lock_irqsave(&qp->s_lock, ps.flags); 892 893 /* Return if we are already busy processing a work request. */ 894 if (!hfi1_send_ok(qp)) { 895 spin_unlock_irqrestore(&qp->s_lock, ps.flags); 896 return; 897 } 898 899 qp->s_flags |= RVT_S_BUSY; 900 901 timeout = jiffies + (timeout_int) / 8; 902 cpu = priv->s_sde ? priv->s_sde->cpu : 903 cpumask_first(cpumask_of_node(ps.ppd->dd->node)); 904 /* insure a pre-built packet is handled */ 905 ps.s_txreq = get_waiting_verbs_txreq(qp); 906 do { 907 /* Check for a constructed packet to be sent. */ 908 if (qp->s_hdrwords != 0) { 909 spin_unlock_irqrestore(&qp->s_lock, ps.flags); 910 /* 911 * If the packet cannot be sent now, return and 912 * the send tasklet will be woken up later. 913 */ 914 if (hfi1_verbs_send(qp, &ps)) 915 return; 916 /* Record that s_ahg is empty. */ 917 qp->s_hdrwords = 0; 918 /* allow other tasks to run */ 919 if (unlikely(time_after(jiffies, timeout))) { 920 if (workqueue_congested(cpu, 921 ps.ppd->hfi1_wq)) { 922 spin_lock_irqsave( 923 &qp->s_lock, 924 ps.flags); 925 qp->s_flags &= ~RVT_S_BUSY; 926 hfi1_schedule_send(qp); 927 spin_unlock_irqrestore( 928 &qp->s_lock, 929 ps.flags); 930 this_cpu_inc( 931 *ps.ppd->dd->send_schedule); 932 return; 933 } 934 if (!irqs_disabled()) { 935 cond_resched(); 936 this_cpu_inc( 937 *ps.ppd->dd->send_schedule); 938 } 939 timeout = jiffies + (timeout_int) / 8; 940 } 941 spin_lock_irqsave(&qp->s_lock, ps.flags); 942 } 943 } while (make_req(qp, &ps)); 944 945 spin_unlock_irqrestore(&qp->s_lock, ps.flags); 946 } 947 948 /* 949 * This should be called with s_lock held. 950 */ 951 void hfi1_send_complete(struct rvt_qp *qp, struct rvt_swqe *wqe, 952 enum ib_wc_status status) 953 { 954 u32 old_last, last; 955 unsigned i; 956 957 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_OR_FLUSH_SEND)) 958 return; 959 960 last = qp->s_last; 961 old_last = last; 962 if (++last >= qp->s_size) 963 last = 0; 964 qp->s_last = last; 965 /* See post_send() */ 966 barrier(); 967 for (i = 0; i < wqe->wr.num_sge; i++) { 968 struct rvt_sge *sge = &wqe->sg_list[i]; 969 970 rvt_put_mr(sge->mr); 971 } 972 if (qp->ibqp.qp_type == IB_QPT_UD || 973 qp->ibqp.qp_type == IB_QPT_SMI || 974 qp->ibqp.qp_type == IB_QPT_GSI) 975 atomic_dec(&ibah_to_rvtah(wqe->ud_wr.ah)->refcount); 976 977 /* See ch. 11.2.4.1 and 10.7.3.1 */ 978 if (!(qp->s_flags & RVT_S_SIGNAL_REQ_WR) || 979 (wqe->wr.send_flags & IB_SEND_SIGNALED) || 980 status != IB_WC_SUCCESS) { 981 struct ib_wc wc; 982 983 memset(&wc, 0, sizeof(wc)); 984 wc.wr_id = wqe->wr.wr_id; 985 wc.status = status; 986 wc.opcode = ib_hfi1_wc_opcode[wqe->wr.opcode]; 987 wc.qp = &qp->ibqp; 988 if (status == IB_WC_SUCCESS) 989 wc.byte_len = wqe->length; 990 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.send_cq), &wc, 991 status != IB_WC_SUCCESS); 992 } 993 994 if (qp->s_acked == old_last) 995 qp->s_acked = last; 996 if (qp->s_cur == old_last) 997 qp->s_cur = last; 998 if (qp->s_tail == old_last) 999 qp->s_tail = last; 1000 if (qp->state == IB_QPS_SQD && last == qp->s_cur) 1001 qp->s_draining = 0; 1002 } 1003