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 49 qp->req.wqe_index = consumer_index(qp->sq.queue); 50 qp->req.psn = qp->comp.psn; 51 qp->req.opcode = -1; 52 53 for (wqe_index = consumer_index(qp->sq.queue); 54 wqe_index != producer_index(qp->sq.queue); 55 wqe_index = next_index(qp->sq.queue, wqe_index)) { 56 wqe = addr_from_index(qp->sq.queue, wqe_index); 57 mask = wr_opcode_mask(wqe->wr.opcode, qp); 58 59 if (wqe->state == wqe_state_posted) 60 break; 61 62 if (wqe->state == wqe_state_done) 63 continue; 64 65 wqe->iova = (mask & WR_ATOMIC_MASK) ? 66 wqe->wr.wr.atomic.remote_addr : 67 (mask & WR_READ_OR_WRITE_MASK) ? 68 wqe->wr.wr.rdma.remote_addr : 69 0; 70 71 if (!first || (mask & WR_READ_MASK) == 0) { 72 wqe->dma.resid = wqe->dma.length; 73 wqe->dma.cur_sge = 0; 74 wqe->dma.sge_offset = 0; 75 } 76 77 if (first) { 78 first = 0; 79 80 if (mask & WR_WRITE_OR_SEND_MASK) { 81 npsn = (qp->comp.psn - wqe->first_psn) & 82 BTH_PSN_MASK; 83 retry_first_write_send(qp, wqe, mask, npsn); 84 } 85 86 if (mask & WR_READ_MASK) { 87 npsn = (wqe->dma.length - wqe->dma.resid) / 88 qp->mtu; 89 wqe->iova += npsn * qp->mtu; 90 } 91 } 92 93 wqe->state = wqe_state_posted; 94 } 95 } 96 97 void rnr_nak_timer(struct timer_list *t) 98 { 99 struct rxe_qp *qp = from_timer(qp, t, rnr_nak_timer); 100 101 pr_debug("qp#%d rnr nak timer fired\n", qp_num(qp)); 102 rxe_run_task(&qp->req.task, 1); 103 } 104 105 static struct rxe_send_wqe *req_next_wqe(struct rxe_qp *qp) 106 { 107 struct rxe_send_wqe *wqe = queue_head(qp->sq.queue); 108 unsigned long flags; 109 110 if (unlikely(qp->req.state == QP_STATE_DRAIN)) { 111 /* check to see if we are drained; 112 * state_lock used by requester and completer 113 */ 114 spin_lock_irqsave(&qp->state_lock, flags); 115 do { 116 if (qp->req.state != QP_STATE_DRAIN) { 117 /* comp just finished */ 118 spin_unlock_irqrestore(&qp->state_lock, 119 flags); 120 break; 121 } 122 123 if (wqe && ((qp->req.wqe_index != 124 consumer_index(qp->sq.queue)) || 125 (wqe->state != wqe_state_posted))) { 126 /* comp not done yet */ 127 spin_unlock_irqrestore(&qp->state_lock, 128 flags); 129 break; 130 } 131 132 qp->req.state = QP_STATE_DRAINED; 133 spin_unlock_irqrestore(&qp->state_lock, flags); 134 135 if (qp->ibqp.event_handler) { 136 struct ib_event ev; 137 138 ev.device = qp->ibqp.device; 139 ev.element.qp = &qp->ibqp; 140 ev.event = IB_EVENT_SQ_DRAINED; 141 qp->ibqp.event_handler(&ev, 142 qp->ibqp.qp_context); 143 } 144 } while (0); 145 } 146 147 if (qp->req.wqe_index == producer_index(qp->sq.queue)) 148 return NULL; 149 150 wqe = addr_from_index(qp->sq.queue, qp->req.wqe_index); 151 152 if (unlikely((qp->req.state == QP_STATE_DRAIN || 153 qp->req.state == QP_STATE_DRAINED) && 154 (wqe->state != wqe_state_processing))) 155 return NULL; 156 157 if (unlikely((wqe->wr.send_flags & IB_SEND_FENCE) && 158 (qp->req.wqe_index != consumer_index(qp->sq.queue)))) { 159 qp->req.wait_fence = 1; 160 return NULL; 161 } 162 163 wqe->mask = wr_opcode_mask(wqe->wr.opcode, qp); 164 return wqe; 165 } 166 167 static int next_opcode_rc(struct rxe_qp *qp, u32 opcode, int fits) 168 { 169 switch (opcode) { 170 case IB_WR_RDMA_WRITE: 171 if (qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_FIRST || 172 qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_MIDDLE) 173 return fits ? 174 IB_OPCODE_RC_RDMA_WRITE_LAST : 175 IB_OPCODE_RC_RDMA_WRITE_MIDDLE; 176 else 177 return fits ? 178 IB_OPCODE_RC_RDMA_WRITE_ONLY : 179 IB_OPCODE_RC_RDMA_WRITE_FIRST; 180 181 case IB_WR_RDMA_WRITE_WITH_IMM: 182 if (qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_FIRST || 183 qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_MIDDLE) 184 return fits ? 185 IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE : 186 IB_OPCODE_RC_RDMA_WRITE_MIDDLE; 187 else 188 return fits ? 189 IB_OPCODE_RC_RDMA_WRITE_ONLY_WITH_IMMEDIATE : 190 IB_OPCODE_RC_RDMA_WRITE_FIRST; 191 192 case IB_WR_SEND: 193 if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST || 194 qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE) 195 return fits ? 196 IB_OPCODE_RC_SEND_LAST : 197 IB_OPCODE_RC_SEND_MIDDLE; 198 else 199 return fits ? 200 IB_OPCODE_RC_SEND_ONLY : 201 IB_OPCODE_RC_SEND_FIRST; 202 203 case IB_WR_SEND_WITH_IMM: 204 if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST || 205 qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE) 206 return fits ? 207 IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE : 208 IB_OPCODE_RC_SEND_MIDDLE; 209 else 210 return fits ? 211 IB_OPCODE_RC_SEND_ONLY_WITH_IMMEDIATE : 212 IB_OPCODE_RC_SEND_FIRST; 213 214 case IB_WR_RDMA_READ: 215 return IB_OPCODE_RC_RDMA_READ_REQUEST; 216 217 case IB_WR_ATOMIC_CMP_AND_SWP: 218 return IB_OPCODE_RC_COMPARE_SWAP; 219 220 case IB_WR_ATOMIC_FETCH_AND_ADD: 221 return IB_OPCODE_RC_FETCH_ADD; 222 223 case IB_WR_SEND_WITH_INV: 224 if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST || 225 qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE) 226 return fits ? IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE : 227 IB_OPCODE_RC_SEND_MIDDLE; 228 else 229 return fits ? IB_OPCODE_RC_SEND_ONLY_WITH_INVALIDATE : 230 IB_OPCODE_RC_SEND_FIRST; 231 case IB_WR_REG_MR: 232 case IB_WR_LOCAL_INV: 233 return opcode; 234 } 235 236 return -EINVAL; 237 } 238 239 static int next_opcode_uc(struct rxe_qp *qp, u32 opcode, int fits) 240 { 241 switch (opcode) { 242 case IB_WR_RDMA_WRITE: 243 if (qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_FIRST || 244 qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_MIDDLE) 245 return fits ? 246 IB_OPCODE_UC_RDMA_WRITE_LAST : 247 IB_OPCODE_UC_RDMA_WRITE_MIDDLE; 248 else 249 return fits ? 250 IB_OPCODE_UC_RDMA_WRITE_ONLY : 251 IB_OPCODE_UC_RDMA_WRITE_FIRST; 252 253 case IB_WR_RDMA_WRITE_WITH_IMM: 254 if (qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_FIRST || 255 qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_MIDDLE) 256 return fits ? 257 IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE : 258 IB_OPCODE_UC_RDMA_WRITE_MIDDLE; 259 else 260 return fits ? 261 IB_OPCODE_UC_RDMA_WRITE_ONLY_WITH_IMMEDIATE : 262 IB_OPCODE_UC_RDMA_WRITE_FIRST; 263 264 case IB_WR_SEND: 265 if (qp->req.opcode == IB_OPCODE_UC_SEND_FIRST || 266 qp->req.opcode == IB_OPCODE_UC_SEND_MIDDLE) 267 return fits ? 268 IB_OPCODE_UC_SEND_LAST : 269 IB_OPCODE_UC_SEND_MIDDLE; 270 else 271 return fits ? 272 IB_OPCODE_UC_SEND_ONLY : 273 IB_OPCODE_UC_SEND_FIRST; 274 275 case IB_WR_SEND_WITH_IMM: 276 if (qp->req.opcode == IB_OPCODE_UC_SEND_FIRST || 277 qp->req.opcode == IB_OPCODE_UC_SEND_MIDDLE) 278 return fits ? 279 IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE : 280 IB_OPCODE_UC_SEND_MIDDLE; 281 else 282 return fits ? 283 IB_OPCODE_UC_SEND_ONLY_WITH_IMMEDIATE : 284 IB_OPCODE_UC_SEND_FIRST; 285 } 286 287 return -EINVAL; 288 } 289 290 static int next_opcode(struct rxe_qp *qp, struct rxe_send_wqe *wqe, 291 u32 opcode) 292 { 293 int fits = (wqe->dma.resid <= qp->mtu); 294 295 switch (qp_type(qp)) { 296 case IB_QPT_RC: 297 return next_opcode_rc(qp, opcode, fits); 298 299 case IB_QPT_UC: 300 return next_opcode_uc(qp, opcode, fits); 301 302 case IB_QPT_SMI: 303 case IB_QPT_UD: 304 case IB_QPT_GSI: 305 switch (opcode) { 306 case IB_WR_SEND: 307 return IB_OPCODE_UD_SEND_ONLY; 308 309 case IB_WR_SEND_WITH_IMM: 310 return IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE; 311 } 312 break; 313 314 default: 315 break; 316 } 317 318 return -EINVAL; 319 } 320 321 static inline int check_init_depth(struct rxe_qp *qp, struct rxe_send_wqe *wqe) 322 { 323 int depth; 324 325 if (wqe->has_rd_atomic) 326 return 0; 327 328 qp->req.need_rd_atomic = 1; 329 depth = atomic_dec_return(&qp->req.rd_atomic); 330 331 if (depth >= 0) { 332 qp->req.need_rd_atomic = 0; 333 wqe->has_rd_atomic = 1; 334 return 0; 335 } 336 337 atomic_inc(&qp->req.rd_atomic); 338 return -EAGAIN; 339 } 340 341 static inline int get_mtu(struct rxe_qp *qp) 342 { 343 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 344 345 if ((qp_type(qp) == IB_QPT_RC) || (qp_type(qp) == IB_QPT_UC)) 346 return qp->mtu; 347 348 return rxe->port.mtu_cap; 349 } 350 351 static struct sk_buff *init_req_packet(struct rxe_qp *qp, 352 struct rxe_send_wqe *wqe, 353 int opcode, int payload, 354 struct rxe_pkt_info *pkt) 355 { 356 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 357 struct sk_buff *skb; 358 struct rxe_send_wr *ibwr = &wqe->wr; 359 struct rxe_av *av; 360 int pad = (-payload) & 0x3; 361 int paylen; 362 int solicited; 363 u16 pkey; 364 u32 qp_num; 365 int ack_req; 366 367 /* length from start of bth to end of icrc */ 368 paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE; 369 370 /* pkt->hdr, rxe, port_num and mask are initialized in ifc 371 * layer 372 */ 373 pkt->opcode = opcode; 374 pkt->qp = qp; 375 pkt->psn = qp->req.psn; 376 pkt->mask = rxe_opcode[opcode].mask; 377 pkt->paylen = paylen; 378 pkt->offset = 0; 379 pkt->wqe = wqe; 380 381 /* init skb */ 382 av = rxe_get_av(pkt); 383 skb = rxe_init_packet(rxe, av, paylen, pkt); 384 if (unlikely(!skb)) 385 return NULL; 386 387 /* init bth */ 388 solicited = (ibwr->send_flags & IB_SEND_SOLICITED) && 389 (pkt->mask & RXE_END_MASK) && 390 ((pkt->mask & (RXE_SEND_MASK)) || 391 (pkt->mask & (RXE_WRITE_MASK | RXE_IMMDT_MASK)) == 392 (RXE_WRITE_MASK | RXE_IMMDT_MASK)); 393 394 pkey = IB_DEFAULT_PKEY_FULL; 395 396 qp_num = (pkt->mask & RXE_DETH_MASK) ? ibwr->wr.ud.remote_qpn : 397 qp->attr.dest_qp_num; 398 399 ack_req = ((pkt->mask & RXE_END_MASK) || 400 (qp->req.noack_pkts++ > RXE_MAX_PKT_PER_ACK)); 401 if (ack_req) 402 qp->req.noack_pkts = 0; 403 404 bth_init(pkt, pkt->opcode, solicited, 0, pad, pkey, qp_num, 405 ack_req, pkt->psn); 406 407 /* init optional headers */ 408 if (pkt->mask & RXE_RETH_MASK) { 409 reth_set_rkey(pkt, ibwr->wr.rdma.rkey); 410 reth_set_va(pkt, wqe->iova); 411 reth_set_len(pkt, wqe->dma.resid); 412 } 413 414 if (pkt->mask & RXE_IMMDT_MASK) 415 immdt_set_imm(pkt, ibwr->ex.imm_data); 416 417 if (pkt->mask & RXE_IETH_MASK) 418 ieth_set_rkey(pkt, ibwr->ex.invalidate_rkey); 419 420 if (pkt->mask & RXE_ATMETH_MASK) { 421 atmeth_set_va(pkt, wqe->iova); 422 if (opcode == IB_OPCODE_RC_COMPARE_SWAP || 423 opcode == IB_OPCODE_RD_COMPARE_SWAP) { 424 atmeth_set_swap_add(pkt, ibwr->wr.atomic.swap); 425 atmeth_set_comp(pkt, ibwr->wr.atomic.compare_add); 426 } else { 427 atmeth_set_swap_add(pkt, ibwr->wr.atomic.compare_add); 428 } 429 atmeth_set_rkey(pkt, ibwr->wr.atomic.rkey); 430 } 431 432 if (pkt->mask & RXE_DETH_MASK) { 433 if (qp->ibqp.qp_num == 1) 434 deth_set_qkey(pkt, GSI_QKEY); 435 else 436 deth_set_qkey(pkt, ibwr->wr.ud.remote_qkey); 437 deth_set_sqp(pkt, qp->ibqp.qp_num); 438 } 439 440 return skb; 441 } 442 443 static int fill_packet(struct rxe_qp *qp, struct rxe_send_wqe *wqe, 444 struct rxe_pkt_info *pkt, struct sk_buff *skb, 445 int paylen) 446 { 447 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 448 u32 crc = 0; 449 u32 *p; 450 int err; 451 452 err = rxe_prepare(pkt, skb, &crc); 453 if (err) 454 return err; 455 456 if (pkt->mask & RXE_WRITE_OR_SEND) { 457 if (wqe->wr.send_flags & IB_SEND_INLINE) { 458 u8 *tmp = &wqe->dma.inline_data[wqe->dma.sge_offset]; 459 460 crc = rxe_crc32(rxe, crc, tmp, paylen); 461 memcpy(payload_addr(pkt), tmp, paylen); 462 463 wqe->dma.resid -= paylen; 464 wqe->dma.sge_offset += paylen; 465 } else { 466 err = copy_data(qp->pd, 0, &wqe->dma, 467 payload_addr(pkt), paylen, 468 from_mem_obj, 469 &crc); 470 if (err) 471 return err; 472 } 473 if (bth_pad(pkt)) { 474 u8 *pad = payload_addr(pkt) + paylen; 475 476 memset(pad, 0, bth_pad(pkt)); 477 crc = rxe_crc32(rxe, crc, pad, bth_pad(pkt)); 478 } 479 } 480 p = payload_addr(pkt) + paylen + bth_pad(pkt); 481 482 *p = ~crc; 483 484 return 0; 485 } 486 487 static void update_wqe_state(struct rxe_qp *qp, 488 struct rxe_send_wqe *wqe, 489 struct rxe_pkt_info *pkt) 490 { 491 if (pkt->mask & RXE_END_MASK) { 492 if (qp_type(qp) == IB_QPT_RC) 493 wqe->state = wqe_state_pending; 494 } else { 495 wqe->state = wqe_state_processing; 496 } 497 } 498 499 static void update_wqe_psn(struct rxe_qp *qp, 500 struct rxe_send_wqe *wqe, 501 struct rxe_pkt_info *pkt, 502 int payload) 503 { 504 /* number of packets left to send including current one */ 505 int num_pkt = (wqe->dma.resid + payload + qp->mtu - 1) / qp->mtu; 506 507 /* handle zero length packet case */ 508 if (num_pkt == 0) 509 num_pkt = 1; 510 511 if (pkt->mask & RXE_START_MASK) { 512 wqe->first_psn = qp->req.psn; 513 wqe->last_psn = (qp->req.psn + num_pkt - 1) & BTH_PSN_MASK; 514 } 515 516 if (pkt->mask & RXE_READ_MASK) 517 qp->req.psn = (wqe->first_psn + num_pkt) & BTH_PSN_MASK; 518 else 519 qp->req.psn = (qp->req.psn + 1) & BTH_PSN_MASK; 520 } 521 522 static void save_state(struct rxe_send_wqe *wqe, 523 struct rxe_qp *qp, 524 struct rxe_send_wqe *rollback_wqe, 525 u32 *rollback_psn) 526 { 527 rollback_wqe->state = wqe->state; 528 rollback_wqe->first_psn = wqe->first_psn; 529 rollback_wqe->last_psn = wqe->last_psn; 530 *rollback_psn = qp->req.psn; 531 } 532 533 static void rollback_state(struct rxe_send_wqe *wqe, 534 struct rxe_qp *qp, 535 struct rxe_send_wqe *rollback_wqe, 536 u32 rollback_psn) 537 { 538 wqe->state = rollback_wqe->state; 539 wqe->first_psn = rollback_wqe->first_psn; 540 wqe->last_psn = rollback_wqe->last_psn; 541 qp->req.psn = rollback_psn; 542 } 543 544 static void update_state(struct rxe_qp *qp, struct rxe_send_wqe *wqe, 545 struct rxe_pkt_info *pkt, int payload) 546 { 547 qp->req.opcode = pkt->opcode; 548 549 if (pkt->mask & RXE_END_MASK) 550 qp->req.wqe_index = next_index(qp->sq.queue, qp->req.wqe_index); 551 552 qp->need_req_skb = 0; 553 554 if (qp->qp_timeout_jiffies && !timer_pending(&qp->retrans_timer)) 555 mod_timer(&qp->retrans_timer, 556 jiffies + qp->qp_timeout_jiffies); 557 } 558 559 int rxe_requester(void *arg) 560 { 561 struct rxe_qp *qp = (struct rxe_qp *)arg; 562 struct rxe_pkt_info pkt; 563 struct sk_buff *skb; 564 struct rxe_send_wqe *wqe; 565 enum rxe_hdr_mask mask; 566 int payload; 567 int mtu; 568 int opcode; 569 int ret; 570 struct rxe_send_wqe rollback_wqe; 571 u32 rollback_psn; 572 573 rxe_add_ref(qp); 574 575 next_wqe: 576 if (unlikely(!qp->valid || qp->req.state == QP_STATE_ERROR)) 577 goto exit; 578 579 if (unlikely(qp->req.state == QP_STATE_RESET)) { 580 qp->req.wqe_index = consumer_index(qp->sq.queue); 581 qp->req.opcode = -1; 582 qp->req.need_rd_atomic = 0; 583 qp->req.wait_psn = 0; 584 qp->req.need_retry = 0; 585 goto exit; 586 } 587 588 if (unlikely(qp->req.need_retry)) { 589 req_retry(qp); 590 qp->req.need_retry = 0; 591 } 592 593 wqe = req_next_wqe(qp); 594 if (unlikely(!wqe)) 595 goto exit; 596 597 if (wqe->mask & WR_REG_MASK) { 598 if (wqe->wr.opcode == IB_WR_LOCAL_INV) { 599 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 600 struct rxe_mem *rmr; 601 602 rmr = rxe_pool_get_index(&rxe->mr_pool, 603 wqe->wr.ex.invalidate_rkey >> 8); 604 if (!rmr) { 605 pr_err("No mr for key %#x\n", 606 wqe->wr.ex.invalidate_rkey); 607 wqe->state = wqe_state_error; 608 wqe->status = IB_WC_MW_BIND_ERR; 609 goto exit; 610 } 611 rmr->state = RXE_MEM_STATE_FREE; 612 rxe_drop_ref(rmr); 613 wqe->state = wqe_state_done; 614 wqe->status = IB_WC_SUCCESS; 615 } else if (wqe->wr.opcode == IB_WR_REG_MR) { 616 struct rxe_mem *rmr = to_rmr(wqe->wr.wr.reg.mr); 617 618 rmr->state = RXE_MEM_STATE_VALID; 619 rmr->access = wqe->wr.wr.reg.access; 620 rmr->ibmr.lkey = wqe->wr.wr.reg.key; 621 rmr->ibmr.rkey = wqe->wr.wr.reg.key; 622 rmr->iova = wqe->wr.wr.reg.mr->iova; 623 wqe->state = wqe_state_done; 624 wqe->status = IB_WC_SUCCESS; 625 } else { 626 goto exit; 627 } 628 if ((wqe->wr.send_flags & IB_SEND_SIGNALED) || 629 qp->sq_sig_type == IB_SIGNAL_ALL_WR) 630 rxe_run_task(&qp->comp.task, 1); 631 qp->req.wqe_index = next_index(qp->sq.queue, 632 qp->req.wqe_index); 633 goto next_wqe; 634 } 635 636 if (unlikely(qp_type(qp) == IB_QPT_RC && 637 qp->req.psn > (qp->comp.psn + RXE_MAX_UNACKED_PSNS))) { 638 qp->req.wait_psn = 1; 639 goto exit; 640 } 641 642 /* Limit the number of inflight SKBs per QP */ 643 if (unlikely(atomic_read(&qp->skb_out) > 644 RXE_INFLIGHT_SKBS_PER_QP_HIGH)) { 645 qp->need_req_skb = 1; 646 goto exit; 647 } 648 649 opcode = next_opcode(qp, wqe, wqe->wr.opcode); 650 if (unlikely(opcode < 0)) { 651 wqe->status = IB_WC_LOC_QP_OP_ERR; 652 goto exit; 653 } 654 655 mask = rxe_opcode[opcode].mask; 656 if (unlikely(mask & RXE_READ_OR_ATOMIC)) { 657 if (check_init_depth(qp, wqe)) 658 goto exit; 659 } 660 661 mtu = get_mtu(qp); 662 payload = (mask & RXE_WRITE_OR_SEND) ? wqe->dma.resid : 0; 663 if (payload > mtu) { 664 if (qp_type(qp) == IB_QPT_UD) { 665 /* C10-93.1.1: If the total sum of all the buffer lengths specified for a 666 * UD message exceeds the MTU of the port as returned by QueryHCA, the CI 667 * shall not emit any packets for this message. Further, the CI shall not 668 * generate an error due to this condition. 669 */ 670 671 /* fake a successful UD send */ 672 wqe->first_psn = qp->req.psn; 673 wqe->last_psn = qp->req.psn; 674 qp->req.psn = (qp->req.psn + 1) & BTH_PSN_MASK; 675 qp->req.opcode = IB_OPCODE_UD_SEND_ONLY; 676 qp->req.wqe_index = next_index(qp->sq.queue, 677 qp->req.wqe_index); 678 wqe->state = wqe_state_done; 679 wqe->status = IB_WC_SUCCESS; 680 __rxe_do_task(&qp->comp.task); 681 rxe_drop_ref(qp); 682 return 0; 683 } 684 payload = mtu; 685 } 686 687 skb = init_req_packet(qp, wqe, opcode, payload, &pkt); 688 if (unlikely(!skb)) { 689 pr_err("qp#%d Failed allocating skb\n", qp_num(qp)); 690 goto err; 691 } 692 693 if (fill_packet(qp, wqe, &pkt, skb, payload)) { 694 pr_debug("qp#%d Error during fill packet\n", qp_num(qp)); 695 kfree_skb(skb); 696 goto err; 697 } 698 699 /* 700 * To prevent a race on wqe access between requester and completer, 701 * wqe members state and psn need to be set before calling 702 * rxe_xmit_packet(). 703 * Otherwise, completer might initiate an unjustified retry flow. 704 */ 705 save_state(wqe, qp, &rollback_wqe, &rollback_psn); 706 update_wqe_state(qp, wqe, &pkt); 707 update_wqe_psn(qp, wqe, &pkt, payload); 708 ret = rxe_xmit_packet(qp, &pkt, skb); 709 if (ret) { 710 qp->need_req_skb = 1; 711 712 rollback_state(wqe, qp, &rollback_wqe, rollback_psn); 713 714 if (ret == -EAGAIN) { 715 rxe_run_task(&qp->req.task, 1); 716 goto exit; 717 } 718 719 goto err; 720 } 721 722 update_state(qp, wqe, &pkt, payload); 723 724 goto next_wqe; 725 726 err: 727 wqe->status = IB_WC_LOC_PROT_ERR; 728 wqe->state = wqe_state_error; 729 __rxe_do_task(&qp->comp.task); 730 731 exit: 732 rxe_drop_ref(qp); 733 return -EAGAIN; 734 } 735