1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB 2 /* 3 * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved. 4 * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved. 5 */ 6 7 #include <linux/skbuff.h> 8 #include <crypto/hash.h> 9 10 #include "rxe.h" 11 #include "rxe_loc.h" 12 #include "rxe_queue.h" 13 14 static int next_opcode(struct rxe_qp *qp, struct rxe_send_wqe *wqe, 15 u32 opcode); 16 17 static inline void retry_first_write_send(struct rxe_qp *qp, 18 struct rxe_send_wqe *wqe, 19 unsigned int mask, int npsn) 20 { 21 int i; 22 23 for (i = 0; i < npsn; i++) { 24 int to_send = (wqe->dma.resid > qp->mtu) ? 25 qp->mtu : wqe->dma.resid; 26 27 qp->req.opcode = next_opcode(qp, wqe, 28 wqe->wr.opcode); 29 30 if (wqe->wr.send_flags & IB_SEND_INLINE) { 31 wqe->dma.resid -= to_send; 32 wqe->dma.sge_offset += to_send; 33 } else { 34 advance_dma_data(&wqe->dma, to_send); 35 } 36 if (mask & WR_WRITE_MASK) 37 wqe->iova += qp->mtu; 38 } 39 } 40 41 static void req_retry(struct rxe_qp *qp) 42 { 43 struct rxe_send_wqe *wqe; 44 unsigned int wqe_index; 45 unsigned int mask; 46 int npsn; 47 int first = 1; 48 struct rxe_queue *q = qp->sq.queue; 49 unsigned int cons; 50 unsigned int prod; 51 52 cons = queue_get_consumer(q, QUEUE_TYPE_FROM_CLIENT); 53 prod = queue_get_producer(q, QUEUE_TYPE_FROM_CLIENT); 54 55 qp->req.wqe_index = cons; 56 qp->req.psn = qp->comp.psn; 57 qp->req.opcode = -1; 58 59 for (wqe_index = cons; wqe_index != prod; 60 wqe_index = queue_next_index(q, wqe_index)) { 61 wqe = queue_addr_from_index(qp->sq.queue, wqe_index); 62 mask = wr_opcode_mask(wqe->wr.opcode, qp); 63 64 if (wqe->state == wqe_state_posted) 65 break; 66 67 if (wqe->state == wqe_state_done) 68 continue; 69 70 wqe->iova = (mask & WR_ATOMIC_MASK) ? 71 wqe->wr.wr.atomic.remote_addr : 72 (mask & WR_READ_OR_WRITE_MASK) ? 73 wqe->wr.wr.rdma.remote_addr : 74 0; 75 76 if (!first || (mask & WR_READ_MASK) == 0) { 77 wqe->dma.resid = wqe->dma.length; 78 wqe->dma.cur_sge = 0; 79 wqe->dma.sge_offset = 0; 80 } 81 82 if (first) { 83 first = 0; 84 85 if (mask & WR_WRITE_OR_SEND_MASK) { 86 npsn = (qp->comp.psn - wqe->first_psn) & 87 BTH_PSN_MASK; 88 retry_first_write_send(qp, wqe, mask, npsn); 89 } 90 91 if (mask & WR_READ_MASK) { 92 npsn = (wqe->dma.length - wqe->dma.resid) / 93 qp->mtu; 94 wqe->iova += npsn * qp->mtu; 95 } 96 } 97 98 wqe->state = wqe_state_posted; 99 } 100 } 101 102 void rnr_nak_timer(struct timer_list *t) 103 { 104 struct rxe_qp *qp = from_timer(qp, t, rnr_nak_timer); 105 106 pr_debug("qp#%d rnr nak timer fired\n", qp_num(qp)); 107 rxe_run_task(&qp->req.task, 1); 108 } 109 110 static struct rxe_send_wqe *req_next_wqe(struct rxe_qp *qp) 111 { 112 struct rxe_send_wqe *wqe; 113 unsigned long flags; 114 struct rxe_queue *q = qp->sq.queue; 115 unsigned int index = qp->req.wqe_index; 116 unsigned int cons; 117 unsigned int prod; 118 119 wqe = queue_head(q, QUEUE_TYPE_FROM_CLIENT); 120 cons = queue_get_consumer(q, QUEUE_TYPE_FROM_CLIENT); 121 prod = queue_get_producer(q, QUEUE_TYPE_FROM_CLIENT); 122 123 if (unlikely(qp->req.state == QP_STATE_DRAIN)) { 124 /* check to see if we are drained; 125 * state_lock used by requester and completer 126 */ 127 spin_lock_irqsave(&qp->state_lock, flags); 128 do { 129 if (qp->req.state != QP_STATE_DRAIN) { 130 /* comp just finished */ 131 spin_unlock_irqrestore(&qp->state_lock, 132 flags); 133 break; 134 } 135 136 if (wqe && ((index != cons) || 137 (wqe->state != wqe_state_posted))) { 138 /* comp not done yet */ 139 spin_unlock_irqrestore(&qp->state_lock, 140 flags); 141 break; 142 } 143 144 qp->req.state = QP_STATE_DRAINED; 145 spin_unlock_irqrestore(&qp->state_lock, flags); 146 147 if (qp->ibqp.event_handler) { 148 struct ib_event ev; 149 150 ev.device = qp->ibqp.device; 151 ev.element.qp = &qp->ibqp; 152 ev.event = IB_EVENT_SQ_DRAINED; 153 qp->ibqp.event_handler(&ev, 154 qp->ibqp.qp_context); 155 } 156 } while (0); 157 } 158 159 if (index == prod) 160 return NULL; 161 162 wqe = queue_addr_from_index(q, index); 163 164 if (unlikely((qp->req.state == QP_STATE_DRAIN || 165 qp->req.state == QP_STATE_DRAINED) && 166 (wqe->state != wqe_state_processing))) 167 return NULL; 168 169 if (unlikely((wqe->wr.send_flags & IB_SEND_FENCE) && 170 (index != cons))) { 171 qp->req.wait_fence = 1; 172 return NULL; 173 } 174 175 wqe->mask = wr_opcode_mask(wqe->wr.opcode, qp); 176 return wqe; 177 } 178 179 static int next_opcode_rc(struct rxe_qp *qp, u32 opcode, int fits) 180 { 181 switch (opcode) { 182 case IB_WR_RDMA_WRITE: 183 if (qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_FIRST || 184 qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_MIDDLE) 185 return fits ? 186 IB_OPCODE_RC_RDMA_WRITE_LAST : 187 IB_OPCODE_RC_RDMA_WRITE_MIDDLE; 188 else 189 return fits ? 190 IB_OPCODE_RC_RDMA_WRITE_ONLY : 191 IB_OPCODE_RC_RDMA_WRITE_FIRST; 192 193 case IB_WR_RDMA_WRITE_WITH_IMM: 194 if (qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_FIRST || 195 qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_MIDDLE) 196 return fits ? 197 IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE : 198 IB_OPCODE_RC_RDMA_WRITE_MIDDLE; 199 else 200 return fits ? 201 IB_OPCODE_RC_RDMA_WRITE_ONLY_WITH_IMMEDIATE : 202 IB_OPCODE_RC_RDMA_WRITE_FIRST; 203 204 case IB_WR_SEND: 205 if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST || 206 qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE) 207 return fits ? 208 IB_OPCODE_RC_SEND_LAST : 209 IB_OPCODE_RC_SEND_MIDDLE; 210 else 211 return fits ? 212 IB_OPCODE_RC_SEND_ONLY : 213 IB_OPCODE_RC_SEND_FIRST; 214 215 case IB_WR_SEND_WITH_IMM: 216 if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST || 217 qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE) 218 return fits ? 219 IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE : 220 IB_OPCODE_RC_SEND_MIDDLE; 221 else 222 return fits ? 223 IB_OPCODE_RC_SEND_ONLY_WITH_IMMEDIATE : 224 IB_OPCODE_RC_SEND_FIRST; 225 226 case IB_WR_RDMA_READ: 227 return IB_OPCODE_RC_RDMA_READ_REQUEST; 228 229 case IB_WR_ATOMIC_CMP_AND_SWP: 230 return IB_OPCODE_RC_COMPARE_SWAP; 231 232 case IB_WR_ATOMIC_FETCH_AND_ADD: 233 return IB_OPCODE_RC_FETCH_ADD; 234 235 case IB_WR_SEND_WITH_INV: 236 if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST || 237 qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE) 238 return fits ? IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE : 239 IB_OPCODE_RC_SEND_MIDDLE; 240 else 241 return fits ? IB_OPCODE_RC_SEND_ONLY_WITH_INVALIDATE : 242 IB_OPCODE_RC_SEND_FIRST; 243 case IB_WR_REG_MR: 244 case IB_WR_LOCAL_INV: 245 return opcode; 246 } 247 248 return -EINVAL; 249 } 250 251 static int next_opcode_uc(struct rxe_qp *qp, u32 opcode, int fits) 252 { 253 switch (opcode) { 254 case IB_WR_RDMA_WRITE: 255 if (qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_FIRST || 256 qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_MIDDLE) 257 return fits ? 258 IB_OPCODE_UC_RDMA_WRITE_LAST : 259 IB_OPCODE_UC_RDMA_WRITE_MIDDLE; 260 else 261 return fits ? 262 IB_OPCODE_UC_RDMA_WRITE_ONLY : 263 IB_OPCODE_UC_RDMA_WRITE_FIRST; 264 265 case IB_WR_RDMA_WRITE_WITH_IMM: 266 if (qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_FIRST || 267 qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_MIDDLE) 268 return fits ? 269 IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE : 270 IB_OPCODE_UC_RDMA_WRITE_MIDDLE; 271 else 272 return fits ? 273 IB_OPCODE_UC_RDMA_WRITE_ONLY_WITH_IMMEDIATE : 274 IB_OPCODE_UC_RDMA_WRITE_FIRST; 275 276 case IB_WR_SEND: 277 if (qp->req.opcode == IB_OPCODE_UC_SEND_FIRST || 278 qp->req.opcode == IB_OPCODE_UC_SEND_MIDDLE) 279 return fits ? 280 IB_OPCODE_UC_SEND_LAST : 281 IB_OPCODE_UC_SEND_MIDDLE; 282 else 283 return fits ? 284 IB_OPCODE_UC_SEND_ONLY : 285 IB_OPCODE_UC_SEND_FIRST; 286 287 case IB_WR_SEND_WITH_IMM: 288 if (qp->req.opcode == IB_OPCODE_UC_SEND_FIRST || 289 qp->req.opcode == IB_OPCODE_UC_SEND_MIDDLE) 290 return fits ? 291 IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE : 292 IB_OPCODE_UC_SEND_MIDDLE; 293 else 294 return fits ? 295 IB_OPCODE_UC_SEND_ONLY_WITH_IMMEDIATE : 296 IB_OPCODE_UC_SEND_FIRST; 297 } 298 299 return -EINVAL; 300 } 301 302 static int next_opcode(struct rxe_qp *qp, struct rxe_send_wqe *wqe, 303 u32 opcode) 304 { 305 int fits = (wqe->dma.resid <= qp->mtu); 306 307 switch (qp_type(qp)) { 308 case IB_QPT_RC: 309 return next_opcode_rc(qp, opcode, fits); 310 311 case IB_QPT_UC: 312 return next_opcode_uc(qp, opcode, fits); 313 314 case IB_QPT_SMI: 315 case IB_QPT_UD: 316 case IB_QPT_GSI: 317 switch (opcode) { 318 case IB_WR_SEND: 319 return IB_OPCODE_UD_SEND_ONLY; 320 321 case IB_WR_SEND_WITH_IMM: 322 return IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE; 323 } 324 break; 325 326 default: 327 break; 328 } 329 330 return -EINVAL; 331 } 332 333 static inline int check_init_depth(struct rxe_qp *qp, struct rxe_send_wqe *wqe) 334 { 335 int depth; 336 337 if (wqe->has_rd_atomic) 338 return 0; 339 340 qp->req.need_rd_atomic = 1; 341 depth = atomic_dec_return(&qp->req.rd_atomic); 342 343 if (depth >= 0) { 344 qp->req.need_rd_atomic = 0; 345 wqe->has_rd_atomic = 1; 346 return 0; 347 } 348 349 atomic_inc(&qp->req.rd_atomic); 350 return -EAGAIN; 351 } 352 353 static inline int get_mtu(struct rxe_qp *qp) 354 { 355 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 356 357 if ((qp_type(qp) == IB_QPT_RC) || (qp_type(qp) == IB_QPT_UC)) 358 return qp->mtu; 359 360 return rxe->port.mtu_cap; 361 } 362 363 static struct sk_buff *init_req_packet(struct rxe_qp *qp, 364 struct rxe_send_wqe *wqe, 365 int opcode, int payload, 366 struct rxe_pkt_info *pkt) 367 { 368 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 369 struct sk_buff *skb; 370 struct rxe_send_wr *ibwr = &wqe->wr; 371 struct rxe_av *av; 372 int pad = (-payload) & 0x3; 373 int paylen; 374 int solicited; 375 u16 pkey; 376 u32 qp_num; 377 int ack_req; 378 379 /* length from start of bth to end of icrc */ 380 paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE; 381 382 /* pkt->hdr, port_num and mask are initialized in ifc layer */ 383 pkt->rxe = rxe; 384 pkt->opcode = opcode; 385 pkt->qp = qp; 386 pkt->psn = qp->req.psn; 387 pkt->mask = rxe_opcode[opcode].mask; 388 pkt->paylen = paylen; 389 pkt->wqe = wqe; 390 391 /* init skb */ 392 av = rxe_get_av(pkt); 393 if (!av) 394 return NULL; 395 396 skb = rxe_init_packet(rxe, av, paylen, pkt); 397 if (unlikely(!skb)) 398 return NULL; 399 400 /* init bth */ 401 solicited = (ibwr->send_flags & IB_SEND_SOLICITED) && 402 (pkt->mask & RXE_END_MASK) && 403 ((pkt->mask & (RXE_SEND_MASK)) || 404 (pkt->mask & (RXE_WRITE_MASK | RXE_IMMDT_MASK)) == 405 (RXE_WRITE_MASK | RXE_IMMDT_MASK)); 406 407 pkey = IB_DEFAULT_PKEY_FULL; 408 409 qp_num = (pkt->mask & RXE_DETH_MASK) ? ibwr->wr.ud.remote_qpn : 410 qp->attr.dest_qp_num; 411 412 ack_req = ((pkt->mask & RXE_END_MASK) || 413 (qp->req.noack_pkts++ > RXE_MAX_PKT_PER_ACK)); 414 if (ack_req) 415 qp->req.noack_pkts = 0; 416 417 bth_init(pkt, pkt->opcode, solicited, 0, pad, pkey, qp_num, 418 ack_req, pkt->psn); 419 420 /* init optional headers */ 421 if (pkt->mask & RXE_RETH_MASK) { 422 reth_set_rkey(pkt, ibwr->wr.rdma.rkey); 423 reth_set_va(pkt, wqe->iova); 424 reth_set_len(pkt, wqe->dma.resid); 425 } 426 427 if (pkt->mask & RXE_IMMDT_MASK) 428 immdt_set_imm(pkt, ibwr->ex.imm_data); 429 430 if (pkt->mask & RXE_IETH_MASK) 431 ieth_set_rkey(pkt, ibwr->ex.invalidate_rkey); 432 433 if (pkt->mask & RXE_ATMETH_MASK) { 434 atmeth_set_va(pkt, wqe->iova); 435 if (opcode == IB_OPCODE_RC_COMPARE_SWAP || 436 opcode == IB_OPCODE_RD_COMPARE_SWAP) { 437 atmeth_set_swap_add(pkt, ibwr->wr.atomic.swap); 438 atmeth_set_comp(pkt, ibwr->wr.atomic.compare_add); 439 } else { 440 atmeth_set_swap_add(pkt, ibwr->wr.atomic.compare_add); 441 } 442 atmeth_set_rkey(pkt, ibwr->wr.atomic.rkey); 443 } 444 445 if (pkt->mask & RXE_DETH_MASK) { 446 if (qp->ibqp.qp_num == 1) 447 deth_set_qkey(pkt, GSI_QKEY); 448 else 449 deth_set_qkey(pkt, ibwr->wr.ud.remote_qkey); 450 deth_set_sqp(pkt, qp->ibqp.qp_num); 451 } 452 453 return skb; 454 } 455 456 static int finish_packet(struct rxe_qp *qp, struct rxe_send_wqe *wqe, 457 struct rxe_pkt_info *pkt, struct sk_buff *skb, 458 int paylen) 459 { 460 int err; 461 462 err = rxe_prepare(pkt, skb); 463 if (err) 464 return err; 465 466 if (pkt->mask & RXE_WRITE_OR_SEND_MASK) { 467 if (wqe->wr.send_flags & IB_SEND_INLINE) { 468 u8 *tmp = &wqe->dma.inline_data[wqe->dma.sge_offset]; 469 470 memcpy(payload_addr(pkt), tmp, paylen); 471 472 wqe->dma.resid -= paylen; 473 wqe->dma.sge_offset += paylen; 474 } else { 475 err = copy_data(qp->pd, 0, &wqe->dma, 476 payload_addr(pkt), paylen, 477 RXE_FROM_MR_OBJ); 478 if (err) 479 return err; 480 } 481 if (bth_pad(pkt)) { 482 u8 *pad = payload_addr(pkt) + paylen; 483 484 memset(pad, 0, bth_pad(pkt)); 485 } 486 } 487 488 return 0; 489 } 490 491 static void update_wqe_state(struct rxe_qp *qp, 492 struct rxe_send_wqe *wqe, 493 struct rxe_pkt_info *pkt) 494 { 495 if (pkt->mask & RXE_END_MASK) { 496 if (qp_type(qp) == IB_QPT_RC) 497 wqe->state = wqe_state_pending; 498 } else { 499 wqe->state = wqe_state_processing; 500 } 501 } 502 503 static void update_wqe_psn(struct rxe_qp *qp, 504 struct rxe_send_wqe *wqe, 505 struct rxe_pkt_info *pkt, 506 int payload) 507 { 508 /* number of packets left to send including current one */ 509 int num_pkt = (wqe->dma.resid + payload + qp->mtu - 1) / qp->mtu; 510 511 /* handle zero length packet case */ 512 if (num_pkt == 0) 513 num_pkt = 1; 514 515 if (pkt->mask & RXE_START_MASK) { 516 wqe->first_psn = qp->req.psn; 517 wqe->last_psn = (qp->req.psn + num_pkt - 1) & BTH_PSN_MASK; 518 } 519 520 if (pkt->mask & RXE_READ_MASK) 521 qp->req.psn = (wqe->first_psn + num_pkt) & BTH_PSN_MASK; 522 else 523 qp->req.psn = (qp->req.psn + 1) & BTH_PSN_MASK; 524 } 525 526 static void save_state(struct rxe_send_wqe *wqe, 527 struct rxe_qp *qp, 528 struct rxe_send_wqe *rollback_wqe, 529 u32 *rollback_psn) 530 { 531 rollback_wqe->state = wqe->state; 532 rollback_wqe->first_psn = wqe->first_psn; 533 rollback_wqe->last_psn = wqe->last_psn; 534 *rollback_psn = qp->req.psn; 535 } 536 537 static void rollback_state(struct rxe_send_wqe *wqe, 538 struct rxe_qp *qp, 539 struct rxe_send_wqe *rollback_wqe, 540 u32 rollback_psn) 541 { 542 wqe->state = rollback_wqe->state; 543 wqe->first_psn = rollback_wqe->first_psn; 544 wqe->last_psn = rollback_wqe->last_psn; 545 qp->req.psn = rollback_psn; 546 } 547 548 static void update_state(struct rxe_qp *qp, struct rxe_send_wqe *wqe, 549 struct rxe_pkt_info *pkt, int payload) 550 { 551 qp->req.opcode = pkt->opcode; 552 553 if (pkt->mask & RXE_END_MASK) 554 qp->req.wqe_index = queue_next_index(qp->sq.queue, 555 qp->req.wqe_index); 556 557 qp->need_req_skb = 0; 558 559 if (qp->qp_timeout_jiffies && !timer_pending(&qp->retrans_timer)) 560 mod_timer(&qp->retrans_timer, 561 jiffies + qp->qp_timeout_jiffies); 562 } 563 564 static int rxe_do_local_ops(struct rxe_qp *qp, struct rxe_send_wqe *wqe) 565 { 566 u8 opcode = wqe->wr.opcode; 567 u32 rkey; 568 int ret; 569 570 switch (opcode) { 571 case IB_WR_LOCAL_INV: 572 rkey = wqe->wr.ex.invalidate_rkey; 573 if (rkey_is_mw(rkey)) 574 ret = rxe_invalidate_mw(qp, rkey); 575 else 576 ret = rxe_invalidate_mr(qp, rkey); 577 578 if (unlikely(ret)) { 579 wqe->status = IB_WC_LOC_QP_OP_ERR; 580 return ret; 581 } 582 break; 583 case IB_WR_REG_MR: 584 ret = rxe_reg_fast_mr(qp, wqe); 585 if (unlikely(ret)) { 586 wqe->status = IB_WC_LOC_QP_OP_ERR; 587 return ret; 588 } 589 break; 590 case IB_WR_BIND_MW: 591 ret = rxe_bind_mw(qp, wqe); 592 if (unlikely(ret)) { 593 wqe->status = IB_WC_MW_BIND_ERR; 594 return ret; 595 } 596 break; 597 default: 598 pr_err("Unexpected send wqe opcode %d\n", opcode); 599 wqe->status = IB_WC_LOC_QP_OP_ERR; 600 return -EINVAL; 601 } 602 603 wqe->state = wqe_state_done; 604 wqe->status = IB_WC_SUCCESS; 605 qp->req.wqe_index = queue_next_index(qp->sq.queue, qp->req.wqe_index); 606 607 if ((wqe->wr.send_flags & IB_SEND_SIGNALED) || 608 qp->sq_sig_type == IB_SIGNAL_ALL_WR) 609 rxe_run_task(&qp->comp.task, 1); 610 611 return 0; 612 } 613 614 int rxe_requester(void *arg) 615 { 616 struct rxe_qp *qp = (struct rxe_qp *)arg; 617 struct rxe_pkt_info pkt; 618 struct sk_buff *skb; 619 struct rxe_send_wqe *wqe; 620 enum rxe_hdr_mask mask; 621 int payload; 622 int mtu; 623 int opcode; 624 int ret; 625 struct rxe_send_wqe rollback_wqe; 626 u32 rollback_psn; 627 struct rxe_queue *q = qp->sq.queue; 628 629 rxe_add_ref(qp); 630 631 next_wqe: 632 if (unlikely(!qp->valid || qp->req.state == QP_STATE_ERROR)) 633 goto exit; 634 635 if (unlikely(qp->req.state == QP_STATE_RESET)) { 636 qp->req.wqe_index = queue_get_consumer(q, 637 QUEUE_TYPE_FROM_CLIENT); 638 qp->req.opcode = -1; 639 qp->req.need_rd_atomic = 0; 640 qp->req.wait_psn = 0; 641 qp->req.need_retry = 0; 642 goto exit; 643 } 644 645 if (unlikely(qp->req.need_retry)) { 646 req_retry(qp); 647 qp->req.need_retry = 0; 648 } 649 650 wqe = req_next_wqe(qp); 651 if (unlikely(!wqe)) 652 goto exit; 653 654 if (wqe->mask & WR_LOCAL_OP_MASK) { 655 ret = rxe_do_local_ops(qp, wqe); 656 if (unlikely(ret)) 657 goto err; 658 else 659 goto next_wqe; 660 } 661 662 if (unlikely(qp_type(qp) == IB_QPT_RC && 663 psn_compare(qp->req.psn, (qp->comp.psn + 664 RXE_MAX_UNACKED_PSNS)) > 0)) { 665 qp->req.wait_psn = 1; 666 goto exit; 667 } 668 669 /* Limit the number of inflight SKBs per QP */ 670 if (unlikely(atomic_read(&qp->skb_out) > 671 RXE_INFLIGHT_SKBS_PER_QP_HIGH)) { 672 qp->need_req_skb = 1; 673 goto exit; 674 } 675 676 opcode = next_opcode(qp, wqe, wqe->wr.opcode); 677 if (unlikely(opcode < 0)) { 678 wqe->status = IB_WC_LOC_QP_OP_ERR; 679 goto exit; 680 } 681 682 mask = rxe_opcode[opcode].mask; 683 if (unlikely(mask & RXE_READ_OR_ATOMIC_MASK)) { 684 if (check_init_depth(qp, wqe)) 685 goto exit; 686 } 687 688 mtu = get_mtu(qp); 689 payload = (mask & RXE_WRITE_OR_SEND_MASK) ? wqe->dma.resid : 0; 690 if (payload > mtu) { 691 if (qp_type(qp) == IB_QPT_UD) { 692 /* C10-93.1.1: If the total sum of all the buffer lengths specified for a 693 * UD message exceeds the MTU of the port as returned by QueryHCA, the CI 694 * shall not emit any packets for this message. Further, the CI shall not 695 * generate an error due to this condition. 696 */ 697 698 /* fake a successful UD send */ 699 wqe->first_psn = qp->req.psn; 700 wqe->last_psn = qp->req.psn; 701 qp->req.psn = (qp->req.psn + 1) & BTH_PSN_MASK; 702 qp->req.opcode = IB_OPCODE_UD_SEND_ONLY; 703 qp->req.wqe_index = queue_next_index(qp->sq.queue, 704 qp->req.wqe_index); 705 wqe->state = wqe_state_done; 706 wqe->status = IB_WC_SUCCESS; 707 __rxe_do_task(&qp->comp.task); 708 rxe_drop_ref(qp); 709 return 0; 710 } 711 payload = mtu; 712 } 713 714 skb = init_req_packet(qp, wqe, opcode, payload, &pkt); 715 if (unlikely(!skb)) { 716 pr_err("qp#%d Failed allocating skb\n", qp_num(qp)); 717 wqe->status = IB_WC_LOC_QP_OP_ERR; 718 goto err; 719 } 720 721 ret = finish_packet(qp, wqe, &pkt, skb, payload); 722 if (unlikely(ret)) { 723 pr_debug("qp#%d Error during finish packet\n", qp_num(qp)); 724 if (ret == -EFAULT) 725 wqe->status = IB_WC_LOC_PROT_ERR; 726 else 727 wqe->status = IB_WC_LOC_QP_OP_ERR; 728 kfree_skb(skb); 729 goto err; 730 } 731 732 /* 733 * To prevent a race on wqe access between requester and completer, 734 * wqe members state and psn need to be set before calling 735 * rxe_xmit_packet(). 736 * Otherwise, completer might initiate an unjustified retry flow. 737 */ 738 save_state(wqe, qp, &rollback_wqe, &rollback_psn); 739 update_wqe_state(qp, wqe, &pkt); 740 update_wqe_psn(qp, wqe, &pkt, payload); 741 ret = rxe_xmit_packet(qp, &pkt, skb); 742 if (ret) { 743 qp->need_req_skb = 1; 744 745 rollback_state(wqe, qp, &rollback_wqe, rollback_psn); 746 747 if (ret == -EAGAIN) { 748 rxe_run_task(&qp->req.task, 1); 749 goto exit; 750 } 751 752 wqe->status = IB_WC_LOC_QP_OP_ERR; 753 goto err; 754 } 755 756 update_state(qp, wqe, &pkt, payload); 757 758 goto next_wqe; 759 760 err: 761 wqe->state = wqe_state_error; 762 __rxe_do_task(&qp->comp.task); 763 764 exit: 765 rxe_drop_ref(qp); 766 return -EAGAIN; 767 } 768