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