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 } 37 } 38 39 static void req_retry(struct rxe_qp *qp) 40 { 41 struct rxe_send_wqe *wqe; 42 unsigned int wqe_index; 43 unsigned int mask; 44 int npsn; 45 int first = 1; 46 struct rxe_queue *q = qp->sq.queue; 47 unsigned int cons; 48 unsigned int prod; 49 50 cons = queue_get_consumer(q, QUEUE_TYPE_FROM_CLIENT); 51 prod = queue_get_producer(q, QUEUE_TYPE_FROM_CLIENT); 52 53 qp->req.wqe_index = cons; 54 qp->req.psn = qp->comp.psn; 55 qp->req.opcode = -1; 56 57 for (wqe_index = cons; wqe_index != prod; 58 wqe_index = queue_next_index(q, wqe_index)) { 59 wqe = queue_addr_from_index(qp->sq.queue, wqe_index); 60 mask = wr_opcode_mask(wqe->wr.opcode, qp); 61 62 if (wqe->state == wqe_state_posted) 63 break; 64 65 if (wqe->state == wqe_state_done) 66 continue; 67 68 wqe->iova = (mask & WR_ATOMIC_MASK) ? 69 wqe->wr.wr.atomic.remote_addr : 70 (mask & WR_READ_OR_WRITE_MASK) ? 71 wqe->wr.wr.rdma.remote_addr : 72 0; 73 74 if (!first || (mask & WR_READ_MASK) == 0) { 75 wqe->dma.resid = wqe->dma.length; 76 wqe->dma.cur_sge = 0; 77 wqe->dma.sge_offset = 0; 78 } 79 80 if (first) { 81 first = 0; 82 83 if (mask & WR_WRITE_OR_SEND_MASK) { 84 npsn = (qp->comp.psn - wqe->first_psn) & 85 BTH_PSN_MASK; 86 retry_first_write_send(qp, wqe, mask, npsn); 87 } 88 89 if (mask & WR_READ_MASK) { 90 npsn = (wqe->dma.length - wqe->dma.resid) / 91 qp->mtu; 92 wqe->iova += npsn * qp->mtu; 93 } 94 } 95 96 wqe->state = wqe_state_posted; 97 } 98 } 99 100 void rnr_nak_timer(struct timer_list *t) 101 { 102 struct rxe_qp *qp = from_timer(qp, t, rnr_nak_timer); 103 104 pr_debug("qp#%d rnr nak timer fired\n", qp_num(qp)); 105 rxe_run_task(&qp->req.task, 1); 106 } 107 108 static struct rxe_send_wqe *req_next_wqe(struct rxe_qp *qp) 109 { 110 struct rxe_send_wqe *wqe; 111 struct rxe_queue *q = qp->sq.queue; 112 unsigned int index = qp->req.wqe_index; 113 unsigned int cons; 114 unsigned int prod; 115 116 wqe = queue_head(q, QUEUE_TYPE_FROM_CLIENT); 117 cons = queue_get_consumer(q, QUEUE_TYPE_FROM_CLIENT); 118 prod = queue_get_producer(q, QUEUE_TYPE_FROM_CLIENT); 119 120 if (unlikely(qp->req.state == QP_STATE_DRAIN)) { 121 /* check to see if we are drained; 122 * state_lock used by requester and completer 123 */ 124 spin_lock_bh(&qp->state_lock); 125 do { 126 if (qp->req.state != QP_STATE_DRAIN) { 127 /* comp just finished */ 128 spin_unlock_bh(&qp->state_lock); 129 break; 130 } 131 132 if (wqe && ((index != cons) || 133 (wqe->state != wqe_state_posted))) { 134 /* comp not done yet */ 135 spin_unlock_bh(&qp->state_lock); 136 break; 137 } 138 139 qp->req.state = QP_STATE_DRAINED; 140 spin_unlock_bh(&qp->state_lock); 141 142 if (qp->ibqp.event_handler) { 143 struct ib_event ev; 144 145 ev.device = qp->ibqp.device; 146 ev.element.qp = &qp->ibqp; 147 ev.event = IB_EVENT_SQ_DRAINED; 148 qp->ibqp.event_handler(&ev, 149 qp->ibqp.qp_context); 150 } 151 } while (0); 152 } 153 154 if (index == prod) 155 return NULL; 156 157 wqe = queue_addr_from_index(q, index); 158 159 if (unlikely((qp->req.state == QP_STATE_DRAIN || 160 qp->req.state == QP_STATE_DRAINED) && 161 (wqe->state != wqe_state_processing))) 162 return NULL; 163 164 if (unlikely((wqe->wr.send_flags & IB_SEND_FENCE) && 165 (index != cons))) { 166 qp->req.wait_fence = 1; 167 return NULL; 168 } 169 170 wqe->mask = wr_opcode_mask(wqe->wr.opcode, qp); 171 return wqe; 172 } 173 174 static int next_opcode_rc(struct rxe_qp *qp, u32 opcode, int fits) 175 { 176 switch (opcode) { 177 case IB_WR_RDMA_WRITE: 178 if (qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_FIRST || 179 qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_MIDDLE) 180 return fits ? 181 IB_OPCODE_RC_RDMA_WRITE_LAST : 182 IB_OPCODE_RC_RDMA_WRITE_MIDDLE; 183 else 184 return fits ? 185 IB_OPCODE_RC_RDMA_WRITE_ONLY : 186 IB_OPCODE_RC_RDMA_WRITE_FIRST; 187 188 case IB_WR_RDMA_WRITE_WITH_IMM: 189 if (qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_FIRST || 190 qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_MIDDLE) 191 return fits ? 192 IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE : 193 IB_OPCODE_RC_RDMA_WRITE_MIDDLE; 194 else 195 return fits ? 196 IB_OPCODE_RC_RDMA_WRITE_ONLY_WITH_IMMEDIATE : 197 IB_OPCODE_RC_RDMA_WRITE_FIRST; 198 199 case IB_WR_SEND: 200 if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST || 201 qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE) 202 return fits ? 203 IB_OPCODE_RC_SEND_LAST : 204 IB_OPCODE_RC_SEND_MIDDLE; 205 else 206 return fits ? 207 IB_OPCODE_RC_SEND_ONLY : 208 IB_OPCODE_RC_SEND_FIRST; 209 210 case IB_WR_SEND_WITH_IMM: 211 if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST || 212 qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE) 213 return fits ? 214 IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE : 215 IB_OPCODE_RC_SEND_MIDDLE; 216 else 217 return fits ? 218 IB_OPCODE_RC_SEND_ONLY_WITH_IMMEDIATE : 219 IB_OPCODE_RC_SEND_FIRST; 220 221 case IB_WR_RDMA_READ: 222 return IB_OPCODE_RC_RDMA_READ_REQUEST; 223 224 case IB_WR_ATOMIC_CMP_AND_SWP: 225 return IB_OPCODE_RC_COMPARE_SWAP; 226 227 case IB_WR_ATOMIC_FETCH_AND_ADD: 228 return IB_OPCODE_RC_FETCH_ADD; 229 230 case IB_WR_SEND_WITH_INV: 231 if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST || 232 qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE) 233 return fits ? IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE : 234 IB_OPCODE_RC_SEND_MIDDLE; 235 else 236 return fits ? IB_OPCODE_RC_SEND_ONLY_WITH_INVALIDATE : 237 IB_OPCODE_RC_SEND_FIRST; 238 case IB_WR_REG_MR: 239 case IB_WR_LOCAL_INV: 240 return opcode; 241 } 242 243 return -EINVAL; 244 } 245 246 static int next_opcode_uc(struct rxe_qp *qp, u32 opcode, int fits) 247 { 248 switch (opcode) { 249 case IB_WR_RDMA_WRITE: 250 if (qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_FIRST || 251 qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_MIDDLE) 252 return fits ? 253 IB_OPCODE_UC_RDMA_WRITE_LAST : 254 IB_OPCODE_UC_RDMA_WRITE_MIDDLE; 255 else 256 return fits ? 257 IB_OPCODE_UC_RDMA_WRITE_ONLY : 258 IB_OPCODE_UC_RDMA_WRITE_FIRST; 259 260 case IB_WR_RDMA_WRITE_WITH_IMM: 261 if (qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_FIRST || 262 qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_MIDDLE) 263 return fits ? 264 IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE : 265 IB_OPCODE_UC_RDMA_WRITE_MIDDLE; 266 else 267 return fits ? 268 IB_OPCODE_UC_RDMA_WRITE_ONLY_WITH_IMMEDIATE : 269 IB_OPCODE_UC_RDMA_WRITE_FIRST; 270 271 case IB_WR_SEND: 272 if (qp->req.opcode == IB_OPCODE_UC_SEND_FIRST || 273 qp->req.opcode == IB_OPCODE_UC_SEND_MIDDLE) 274 return fits ? 275 IB_OPCODE_UC_SEND_LAST : 276 IB_OPCODE_UC_SEND_MIDDLE; 277 else 278 return fits ? 279 IB_OPCODE_UC_SEND_ONLY : 280 IB_OPCODE_UC_SEND_FIRST; 281 282 case IB_WR_SEND_WITH_IMM: 283 if (qp->req.opcode == IB_OPCODE_UC_SEND_FIRST || 284 qp->req.opcode == IB_OPCODE_UC_SEND_MIDDLE) 285 return fits ? 286 IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE : 287 IB_OPCODE_UC_SEND_MIDDLE; 288 else 289 return fits ? 290 IB_OPCODE_UC_SEND_ONLY_WITH_IMMEDIATE : 291 IB_OPCODE_UC_SEND_FIRST; 292 } 293 294 return -EINVAL; 295 } 296 297 static int next_opcode(struct rxe_qp *qp, struct rxe_send_wqe *wqe, 298 u32 opcode) 299 { 300 int fits = (wqe->dma.resid <= qp->mtu); 301 302 switch (qp_type(qp)) { 303 case IB_QPT_RC: 304 return next_opcode_rc(qp, opcode, fits); 305 306 case IB_QPT_UC: 307 return next_opcode_uc(qp, opcode, fits); 308 309 case IB_QPT_UD: 310 case IB_QPT_GSI: 311 switch (opcode) { 312 case IB_WR_SEND: 313 return IB_OPCODE_UD_SEND_ONLY; 314 315 case IB_WR_SEND_WITH_IMM: 316 return IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE; 317 } 318 break; 319 320 default: 321 break; 322 } 323 324 return -EINVAL; 325 } 326 327 static inline int check_init_depth(struct rxe_qp *qp, struct rxe_send_wqe *wqe) 328 { 329 int depth; 330 331 if (wqe->has_rd_atomic) 332 return 0; 333 334 qp->req.need_rd_atomic = 1; 335 depth = atomic_dec_return(&qp->req.rd_atomic); 336 337 if (depth >= 0) { 338 qp->req.need_rd_atomic = 0; 339 wqe->has_rd_atomic = 1; 340 return 0; 341 } 342 343 atomic_inc(&qp->req.rd_atomic); 344 return -EAGAIN; 345 } 346 347 static inline int get_mtu(struct rxe_qp *qp) 348 { 349 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 350 351 if ((qp_type(qp) == IB_QPT_RC) || (qp_type(qp) == IB_QPT_UC)) 352 return qp->mtu; 353 354 return rxe->port.mtu_cap; 355 } 356 357 static struct sk_buff *init_req_packet(struct rxe_qp *qp, 358 struct rxe_av *av, 359 struct rxe_send_wqe *wqe, 360 int opcode, u32 payload, 361 struct rxe_pkt_info *pkt) 362 { 363 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 364 struct sk_buff *skb; 365 struct rxe_send_wr *ibwr = &wqe->wr; 366 int pad = (-payload) & 0x3; 367 int paylen; 368 int solicited; 369 u32 qp_num; 370 int ack_req; 371 372 /* length from start of bth to end of icrc */ 373 paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE; 374 pkt->paylen = paylen; 375 376 /* init skb */ 377 skb = rxe_init_packet(rxe, av, paylen, pkt); 378 if (unlikely(!skb)) 379 return NULL; 380 381 /* init bth */ 382 solicited = (ibwr->send_flags & IB_SEND_SOLICITED) && 383 (pkt->mask & RXE_END_MASK) && 384 ((pkt->mask & (RXE_SEND_MASK)) || 385 (pkt->mask & (RXE_WRITE_MASK | RXE_IMMDT_MASK)) == 386 (RXE_WRITE_MASK | RXE_IMMDT_MASK)); 387 388 qp_num = (pkt->mask & RXE_DETH_MASK) ? ibwr->wr.ud.remote_qpn : 389 qp->attr.dest_qp_num; 390 391 ack_req = ((pkt->mask & RXE_END_MASK) || 392 (qp->req.noack_pkts++ > RXE_MAX_PKT_PER_ACK)); 393 if (ack_req) 394 qp->req.noack_pkts = 0; 395 396 bth_init(pkt, pkt->opcode, solicited, 0, pad, IB_DEFAULT_PKEY_FULL, qp_num, 397 ack_req, pkt->psn); 398 399 /* init optional headers */ 400 if (pkt->mask & RXE_RETH_MASK) { 401 reth_set_rkey(pkt, ibwr->wr.rdma.rkey); 402 reth_set_va(pkt, wqe->iova); 403 reth_set_len(pkt, wqe->dma.resid); 404 } 405 406 if (pkt->mask & RXE_IMMDT_MASK) 407 immdt_set_imm(pkt, ibwr->ex.imm_data); 408 409 if (pkt->mask & RXE_IETH_MASK) 410 ieth_set_rkey(pkt, ibwr->ex.invalidate_rkey); 411 412 if (pkt->mask & RXE_ATMETH_MASK) { 413 atmeth_set_va(pkt, wqe->iova); 414 if (opcode == IB_OPCODE_RC_COMPARE_SWAP) { 415 atmeth_set_swap_add(pkt, ibwr->wr.atomic.swap); 416 atmeth_set_comp(pkt, ibwr->wr.atomic.compare_add); 417 } else { 418 atmeth_set_swap_add(pkt, ibwr->wr.atomic.compare_add); 419 } 420 atmeth_set_rkey(pkt, ibwr->wr.atomic.rkey); 421 } 422 423 if (pkt->mask & RXE_DETH_MASK) { 424 if (qp->ibqp.qp_num == 1) 425 deth_set_qkey(pkt, GSI_QKEY); 426 else 427 deth_set_qkey(pkt, ibwr->wr.ud.remote_qkey); 428 deth_set_sqp(pkt, qp->ibqp.qp_num); 429 } 430 431 return skb; 432 } 433 434 static int finish_packet(struct rxe_qp *qp, struct rxe_av *av, 435 struct rxe_send_wqe *wqe, struct rxe_pkt_info *pkt, 436 struct sk_buff *skb, u32 payload) 437 { 438 int err; 439 440 err = rxe_prepare(av, pkt, skb); 441 if (err) 442 return err; 443 444 if (pkt->mask & RXE_WRITE_OR_SEND_MASK) { 445 if (wqe->wr.send_flags & IB_SEND_INLINE) { 446 u8 *tmp = &wqe->dma.inline_data[wqe->dma.sge_offset]; 447 448 memcpy(payload_addr(pkt), tmp, payload); 449 450 wqe->dma.resid -= payload; 451 wqe->dma.sge_offset += payload; 452 } else { 453 err = copy_data(qp->pd, 0, &wqe->dma, 454 payload_addr(pkt), payload, 455 RXE_FROM_MR_OBJ); 456 if (err) 457 return err; 458 } 459 if (bth_pad(pkt)) { 460 u8 *pad = payload_addr(pkt) + payload; 461 462 memset(pad, 0, bth_pad(pkt)); 463 } 464 } 465 466 return 0; 467 } 468 469 static void update_wqe_state(struct rxe_qp *qp, 470 struct rxe_send_wqe *wqe, 471 struct rxe_pkt_info *pkt) 472 { 473 if (pkt->mask & RXE_END_MASK) { 474 if (qp_type(qp) == IB_QPT_RC) 475 wqe->state = wqe_state_pending; 476 } else { 477 wqe->state = wqe_state_processing; 478 } 479 } 480 481 static void update_wqe_psn(struct rxe_qp *qp, 482 struct rxe_send_wqe *wqe, 483 struct rxe_pkt_info *pkt, 484 u32 payload) 485 { 486 /* number of packets left to send including current one */ 487 int num_pkt = (wqe->dma.resid + payload + qp->mtu - 1) / qp->mtu; 488 489 /* handle zero length packet case */ 490 if (num_pkt == 0) 491 num_pkt = 1; 492 493 if (pkt->mask & RXE_START_MASK) { 494 wqe->first_psn = qp->req.psn; 495 wqe->last_psn = (qp->req.psn + num_pkt - 1) & BTH_PSN_MASK; 496 } 497 498 if (pkt->mask & RXE_READ_MASK) 499 qp->req.psn = (wqe->first_psn + num_pkt) & BTH_PSN_MASK; 500 else 501 qp->req.psn = (qp->req.psn + 1) & BTH_PSN_MASK; 502 } 503 504 static void save_state(struct rxe_send_wqe *wqe, 505 struct rxe_qp *qp, 506 struct rxe_send_wqe *rollback_wqe, 507 u32 *rollback_psn) 508 { 509 rollback_wqe->state = wqe->state; 510 rollback_wqe->first_psn = wqe->first_psn; 511 rollback_wqe->last_psn = wqe->last_psn; 512 *rollback_psn = qp->req.psn; 513 } 514 515 static void rollback_state(struct rxe_send_wqe *wqe, 516 struct rxe_qp *qp, 517 struct rxe_send_wqe *rollback_wqe, 518 u32 rollback_psn) 519 { 520 wqe->state = rollback_wqe->state; 521 wqe->first_psn = rollback_wqe->first_psn; 522 wqe->last_psn = rollback_wqe->last_psn; 523 qp->req.psn = rollback_psn; 524 } 525 526 static void update_state(struct rxe_qp *qp, struct rxe_pkt_info *pkt) 527 { 528 qp->req.opcode = pkt->opcode; 529 530 if (pkt->mask & RXE_END_MASK) 531 qp->req.wqe_index = queue_next_index(qp->sq.queue, 532 qp->req.wqe_index); 533 534 qp->need_req_skb = 0; 535 536 if (qp->qp_timeout_jiffies && !timer_pending(&qp->retrans_timer)) 537 mod_timer(&qp->retrans_timer, 538 jiffies + qp->qp_timeout_jiffies); 539 } 540 541 static int rxe_do_local_ops(struct rxe_qp *qp, struct rxe_send_wqe *wqe) 542 { 543 u8 opcode = wqe->wr.opcode; 544 u32 rkey; 545 int ret; 546 547 switch (opcode) { 548 case IB_WR_LOCAL_INV: 549 rkey = wqe->wr.ex.invalidate_rkey; 550 if (rkey_is_mw(rkey)) 551 ret = rxe_invalidate_mw(qp, rkey); 552 else 553 ret = rxe_invalidate_mr(qp, rkey); 554 555 if (unlikely(ret)) { 556 wqe->status = IB_WC_LOC_QP_OP_ERR; 557 return ret; 558 } 559 break; 560 case IB_WR_REG_MR: 561 ret = rxe_reg_fast_mr(qp, wqe); 562 if (unlikely(ret)) { 563 wqe->status = IB_WC_LOC_QP_OP_ERR; 564 return ret; 565 } 566 break; 567 case IB_WR_BIND_MW: 568 ret = rxe_bind_mw(qp, wqe); 569 if (unlikely(ret)) { 570 wqe->status = IB_WC_MW_BIND_ERR; 571 return ret; 572 } 573 break; 574 default: 575 pr_err("Unexpected send wqe opcode %d\n", opcode); 576 wqe->status = IB_WC_LOC_QP_OP_ERR; 577 return -EINVAL; 578 } 579 580 wqe->state = wqe_state_done; 581 wqe->status = IB_WC_SUCCESS; 582 qp->req.wqe_index = queue_next_index(qp->sq.queue, qp->req.wqe_index); 583 584 if ((wqe->wr.send_flags & IB_SEND_SIGNALED) || 585 qp->sq_sig_type == IB_SIGNAL_ALL_WR) 586 rxe_run_task(&qp->comp.task, 1); 587 588 return 0; 589 } 590 591 int rxe_requester(void *arg) 592 { 593 struct rxe_qp *qp = (struct rxe_qp *)arg; 594 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 595 struct rxe_pkt_info pkt; 596 struct sk_buff *skb; 597 struct rxe_send_wqe *wqe; 598 enum rxe_hdr_mask mask; 599 u32 payload; 600 int mtu; 601 int opcode; 602 int ret; 603 struct rxe_send_wqe rollback_wqe; 604 u32 rollback_psn; 605 struct rxe_queue *q = qp->sq.queue; 606 struct rxe_ah *ah; 607 struct rxe_av *av; 608 609 if (!rxe_get(qp)) 610 return -EAGAIN; 611 612 next_wqe: 613 if (unlikely(!qp->valid || qp->req.state == QP_STATE_ERROR)) 614 goto exit; 615 616 if (unlikely(qp->req.state == QP_STATE_RESET)) { 617 qp->req.wqe_index = queue_get_consumer(q, 618 QUEUE_TYPE_FROM_CLIENT); 619 qp->req.opcode = -1; 620 qp->req.need_rd_atomic = 0; 621 qp->req.wait_psn = 0; 622 qp->req.need_retry = 0; 623 goto exit; 624 } 625 626 if (unlikely(qp->req.need_retry)) { 627 req_retry(qp); 628 qp->req.need_retry = 0; 629 } 630 631 wqe = req_next_wqe(qp); 632 if (unlikely(!wqe)) 633 goto exit; 634 635 if (wqe->mask & WR_LOCAL_OP_MASK) { 636 ret = rxe_do_local_ops(qp, wqe); 637 if (unlikely(ret)) 638 goto err; 639 else 640 goto next_wqe; 641 } 642 643 if (unlikely(qp_type(qp) == IB_QPT_RC && 644 psn_compare(qp->req.psn, (qp->comp.psn + 645 RXE_MAX_UNACKED_PSNS)) > 0)) { 646 qp->req.wait_psn = 1; 647 goto exit; 648 } 649 650 /* Limit the number of inflight SKBs per QP */ 651 if (unlikely(atomic_read(&qp->skb_out) > 652 RXE_INFLIGHT_SKBS_PER_QP_HIGH)) { 653 qp->need_req_skb = 1; 654 goto exit; 655 } 656 657 opcode = next_opcode(qp, wqe, wqe->wr.opcode); 658 if (unlikely(opcode < 0)) { 659 wqe->status = IB_WC_LOC_QP_OP_ERR; 660 goto err; 661 } 662 663 mask = rxe_opcode[opcode].mask; 664 if (unlikely(mask & RXE_READ_OR_ATOMIC_MASK)) { 665 if (check_init_depth(qp, wqe)) 666 goto exit; 667 } 668 669 mtu = get_mtu(qp); 670 payload = (mask & RXE_WRITE_OR_SEND_MASK) ? wqe->dma.resid : 0; 671 if (payload > mtu) { 672 if (qp_type(qp) == IB_QPT_UD) { 673 /* C10-93.1.1: If the total sum of all the buffer lengths specified for a 674 * UD message exceeds the MTU of the port as returned by QueryHCA, the CI 675 * shall not emit any packets for this message. Further, the CI shall not 676 * generate an error due to this condition. 677 */ 678 679 /* fake a successful UD send */ 680 wqe->first_psn = qp->req.psn; 681 wqe->last_psn = qp->req.psn; 682 qp->req.psn = (qp->req.psn + 1) & BTH_PSN_MASK; 683 qp->req.opcode = IB_OPCODE_UD_SEND_ONLY; 684 qp->req.wqe_index = queue_next_index(qp->sq.queue, 685 qp->req.wqe_index); 686 wqe->state = wqe_state_done; 687 wqe->status = IB_WC_SUCCESS; 688 __rxe_do_task(&qp->comp.task); 689 rxe_put(qp); 690 return 0; 691 } 692 payload = mtu; 693 } 694 695 pkt.rxe = rxe; 696 pkt.opcode = opcode; 697 pkt.qp = qp; 698 pkt.psn = qp->req.psn; 699 pkt.mask = rxe_opcode[opcode].mask; 700 pkt.wqe = wqe; 701 702 av = rxe_get_av(&pkt, &ah); 703 if (unlikely(!av)) { 704 pr_err("qp#%d Failed no address vector\n", qp_num(qp)); 705 wqe->status = IB_WC_LOC_QP_OP_ERR; 706 goto err_drop_ah; 707 } 708 709 skb = init_req_packet(qp, av, wqe, opcode, payload, &pkt); 710 if (unlikely(!skb)) { 711 pr_err("qp#%d Failed allocating skb\n", qp_num(qp)); 712 wqe->status = IB_WC_LOC_QP_OP_ERR; 713 goto err_drop_ah; 714 } 715 716 ret = finish_packet(qp, av, wqe, &pkt, skb, payload); 717 if (unlikely(ret)) { 718 pr_debug("qp#%d Error during finish packet\n", qp_num(qp)); 719 if (ret == -EFAULT) 720 wqe->status = IB_WC_LOC_PROT_ERR; 721 else 722 wqe->status = IB_WC_LOC_QP_OP_ERR; 723 kfree_skb(skb); 724 goto err_drop_ah; 725 } 726 727 if (ah) 728 rxe_put(ah); 729 730 /* 731 * To prevent a race on wqe access between requester and completer, 732 * wqe members state and psn need to be set before calling 733 * rxe_xmit_packet(). 734 * Otherwise, completer might initiate an unjustified retry flow. 735 */ 736 save_state(wqe, qp, &rollback_wqe, &rollback_psn); 737 update_wqe_state(qp, wqe, &pkt); 738 update_wqe_psn(qp, wqe, &pkt, payload); 739 ret = rxe_xmit_packet(qp, &pkt, skb); 740 if (ret) { 741 qp->need_req_skb = 1; 742 743 rollback_state(wqe, qp, &rollback_wqe, rollback_psn); 744 745 if (ret == -EAGAIN) { 746 rxe_run_task(&qp->req.task, 1); 747 goto exit; 748 } 749 750 wqe->status = IB_WC_LOC_QP_OP_ERR; 751 goto err; 752 } 753 754 update_state(qp, &pkt); 755 756 goto next_wqe; 757 758 err_drop_ah: 759 if (ah) 760 rxe_put(ah); 761 err: 762 wqe->state = wqe_state_error; 763 __rxe_do_task(&qp->comp.task); 764 765 exit: 766 rxe_put(qp); 767 return -EAGAIN; 768 } 769