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 9 #include "rxe.h" 10 #include "rxe_loc.h" 11 #include "rxe_queue.h" 12 13 enum resp_states { 14 RESPST_NONE, 15 RESPST_GET_REQ, 16 RESPST_CHK_PSN, 17 RESPST_CHK_OP_SEQ, 18 RESPST_CHK_OP_VALID, 19 RESPST_CHK_RESOURCE, 20 RESPST_CHK_LENGTH, 21 RESPST_CHK_RKEY, 22 RESPST_EXECUTE, 23 RESPST_READ_REPLY, 24 RESPST_COMPLETE, 25 RESPST_ACKNOWLEDGE, 26 RESPST_CLEANUP, 27 RESPST_DUPLICATE_REQUEST, 28 RESPST_ERR_MALFORMED_WQE, 29 RESPST_ERR_UNSUPPORTED_OPCODE, 30 RESPST_ERR_MISALIGNED_ATOMIC, 31 RESPST_ERR_PSN_OUT_OF_SEQ, 32 RESPST_ERR_MISSING_OPCODE_FIRST, 33 RESPST_ERR_MISSING_OPCODE_LAST_C, 34 RESPST_ERR_MISSING_OPCODE_LAST_D1E, 35 RESPST_ERR_TOO_MANY_RDMA_ATM_REQ, 36 RESPST_ERR_RNR, 37 RESPST_ERR_RKEY_VIOLATION, 38 RESPST_ERR_INVALIDATE_RKEY, 39 RESPST_ERR_LENGTH, 40 RESPST_ERR_CQ_OVERFLOW, 41 RESPST_ERROR, 42 RESPST_RESET, 43 RESPST_DONE, 44 RESPST_EXIT, 45 }; 46 47 static char *resp_state_name[] = { 48 [RESPST_NONE] = "NONE", 49 [RESPST_GET_REQ] = "GET_REQ", 50 [RESPST_CHK_PSN] = "CHK_PSN", 51 [RESPST_CHK_OP_SEQ] = "CHK_OP_SEQ", 52 [RESPST_CHK_OP_VALID] = "CHK_OP_VALID", 53 [RESPST_CHK_RESOURCE] = "CHK_RESOURCE", 54 [RESPST_CHK_LENGTH] = "CHK_LENGTH", 55 [RESPST_CHK_RKEY] = "CHK_RKEY", 56 [RESPST_EXECUTE] = "EXECUTE", 57 [RESPST_READ_REPLY] = "READ_REPLY", 58 [RESPST_COMPLETE] = "COMPLETE", 59 [RESPST_ACKNOWLEDGE] = "ACKNOWLEDGE", 60 [RESPST_CLEANUP] = "CLEANUP", 61 [RESPST_DUPLICATE_REQUEST] = "DUPLICATE_REQUEST", 62 [RESPST_ERR_MALFORMED_WQE] = "ERR_MALFORMED_WQE", 63 [RESPST_ERR_UNSUPPORTED_OPCODE] = "ERR_UNSUPPORTED_OPCODE", 64 [RESPST_ERR_MISALIGNED_ATOMIC] = "ERR_MISALIGNED_ATOMIC", 65 [RESPST_ERR_PSN_OUT_OF_SEQ] = "ERR_PSN_OUT_OF_SEQ", 66 [RESPST_ERR_MISSING_OPCODE_FIRST] = "ERR_MISSING_OPCODE_FIRST", 67 [RESPST_ERR_MISSING_OPCODE_LAST_C] = "ERR_MISSING_OPCODE_LAST_C", 68 [RESPST_ERR_MISSING_OPCODE_LAST_D1E] = "ERR_MISSING_OPCODE_LAST_D1E", 69 [RESPST_ERR_TOO_MANY_RDMA_ATM_REQ] = "ERR_TOO_MANY_RDMA_ATM_REQ", 70 [RESPST_ERR_RNR] = "ERR_RNR", 71 [RESPST_ERR_RKEY_VIOLATION] = "ERR_RKEY_VIOLATION", 72 [RESPST_ERR_INVALIDATE_RKEY] = "ERR_INVALIDATE_RKEY_VIOLATION", 73 [RESPST_ERR_LENGTH] = "ERR_LENGTH", 74 [RESPST_ERR_CQ_OVERFLOW] = "ERR_CQ_OVERFLOW", 75 [RESPST_ERROR] = "ERROR", 76 [RESPST_RESET] = "RESET", 77 [RESPST_DONE] = "DONE", 78 [RESPST_EXIT] = "EXIT", 79 }; 80 81 /* rxe_recv calls here to add a request packet to the input queue */ 82 void rxe_resp_queue_pkt(struct rxe_qp *qp, struct sk_buff *skb) 83 { 84 int must_sched; 85 struct rxe_pkt_info *pkt = SKB_TO_PKT(skb); 86 87 skb_queue_tail(&qp->req_pkts, skb); 88 89 must_sched = (pkt->opcode == IB_OPCODE_RC_RDMA_READ_REQUEST) || 90 (skb_queue_len(&qp->req_pkts) > 1); 91 92 rxe_run_task(&qp->resp.task, must_sched); 93 } 94 95 static inline enum resp_states get_req(struct rxe_qp *qp, 96 struct rxe_pkt_info **pkt_p) 97 { 98 struct sk_buff *skb; 99 100 if (qp->resp.state == QP_STATE_ERROR) { 101 while ((skb = skb_dequeue(&qp->req_pkts))) { 102 rxe_drop_ref(qp); 103 kfree_skb(skb); 104 ib_device_put(qp->ibqp.device); 105 } 106 107 /* go drain recv wr queue */ 108 return RESPST_CHK_RESOURCE; 109 } 110 111 skb = skb_peek(&qp->req_pkts); 112 if (!skb) 113 return RESPST_EXIT; 114 115 *pkt_p = SKB_TO_PKT(skb); 116 117 return (qp->resp.res) ? RESPST_READ_REPLY : RESPST_CHK_PSN; 118 } 119 120 static enum resp_states check_psn(struct rxe_qp *qp, 121 struct rxe_pkt_info *pkt) 122 { 123 int diff = psn_compare(pkt->psn, qp->resp.psn); 124 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 125 126 switch (qp_type(qp)) { 127 case IB_QPT_RC: 128 if (diff > 0) { 129 if (qp->resp.sent_psn_nak) 130 return RESPST_CLEANUP; 131 132 qp->resp.sent_psn_nak = 1; 133 rxe_counter_inc(rxe, RXE_CNT_OUT_OF_SEQ_REQ); 134 return RESPST_ERR_PSN_OUT_OF_SEQ; 135 136 } else if (diff < 0) { 137 rxe_counter_inc(rxe, RXE_CNT_DUP_REQ); 138 return RESPST_DUPLICATE_REQUEST; 139 } 140 141 if (qp->resp.sent_psn_nak) 142 qp->resp.sent_psn_nak = 0; 143 144 break; 145 146 case IB_QPT_UC: 147 if (qp->resp.drop_msg || diff != 0) { 148 if (pkt->mask & RXE_START_MASK) { 149 qp->resp.drop_msg = 0; 150 return RESPST_CHK_OP_SEQ; 151 } 152 153 qp->resp.drop_msg = 1; 154 return RESPST_CLEANUP; 155 } 156 break; 157 default: 158 break; 159 } 160 161 return RESPST_CHK_OP_SEQ; 162 } 163 164 static enum resp_states check_op_seq(struct rxe_qp *qp, 165 struct rxe_pkt_info *pkt) 166 { 167 switch (qp_type(qp)) { 168 case IB_QPT_RC: 169 switch (qp->resp.opcode) { 170 case IB_OPCODE_RC_SEND_FIRST: 171 case IB_OPCODE_RC_SEND_MIDDLE: 172 switch (pkt->opcode) { 173 case IB_OPCODE_RC_SEND_MIDDLE: 174 case IB_OPCODE_RC_SEND_LAST: 175 case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE: 176 case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE: 177 return RESPST_CHK_OP_VALID; 178 default: 179 return RESPST_ERR_MISSING_OPCODE_LAST_C; 180 } 181 182 case IB_OPCODE_RC_RDMA_WRITE_FIRST: 183 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE: 184 switch (pkt->opcode) { 185 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE: 186 case IB_OPCODE_RC_RDMA_WRITE_LAST: 187 case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE: 188 return RESPST_CHK_OP_VALID; 189 default: 190 return RESPST_ERR_MISSING_OPCODE_LAST_C; 191 } 192 193 default: 194 switch (pkt->opcode) { 195 case IB_OPCODE_RC_SEND_MIDDLE: 196 case IB_OPCODE_RC_SEND_LAST: 197 case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE: 198 case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE: 199 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE: 200 case IB_OPCODE_RC_RDMA_WRITE_LAST: 201 case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE: 202 return RESPST_ERR_MISSING_OPCODE_FIRST; 203 default: 204 return RESPST_CHK_OP_VALID; 205 } 206 } 207 break; 208 209 case IB_QPT_UC: 210 switch (qp->resp.opcode) { 211 case IB_OPCODE_UC_SEND_FIRST: 212 case IB_OPCODE_UC_SEND_MIDDLE: 213 switch (pkt->opcode) { 214 case IB_OPCODE_UC_SEND_MIDDLE: 215 case IB_OPCODE_UC_SEND_LAST: 216 case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE: 217 return RESPST_CHK_OP_VALID; 218 default: 219 return RESPST_ERR_MISSING_OPCODE_LAST_D1E; 220 } 221 222 case IB_OPCODE_UC_RDMA_WRITE_FIRST: 223 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE: 224 switch (pkt->opcode) { 225 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE: 226 case IB_OPCODE_UC_RDMA_WRITE_LAST: 227 case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE: 228 return RESPST_CHK_OP_VALID; 229 default: 230 return RESPST_ERR_MISSING_OPCODE_LAST_D1E; 231 } 232 233 default: 234 switch (pkt->opcode) { 235 case IB_OPCODE_UC_SEND_MIDDLE: 236 case IB_OPCODE_UC_SEND_LAST: 237 case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE: 238 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE: 239 case IB_OPCODE_UC_RDMA_WRITE_LAST: 240 case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE: 241 qp->resp.drop_msg = 1; 242 return RESPST_CLEANUP; 243 default: 244 return RESPST_CHK_OP_VALID; 245 } 246 } 247 break; 248 249 default: 250 return RESPST_CHK_OP_VALID; 251 } 252 } 253 254 static enum resp_states check_op_valid(struct rxe_qp *qp, 255 struct rxe_pkt_info *pkt) 256 { 257 switch (qp_type(qp)) { 258 case IB_QPT_RC: 259 if (((pkt->mask & RXE_READ_MASK) && 260 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_READ)) || 261 ((pkt->mask & RXE_WRITE_MASK) && 262 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) || 263 ((pkt->mask & RXE_ATOMIC_MASK) && 264 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) { 265 return RESPST_ERR_UNSUPPORTED_OPCODE; 266 } 267 268 break; 269 270 case IB_QPT_UC: 271 if ((pkt->mask & RXE_WRITE_MASK) && 272 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) { 273 qp->resp.drop_msg = 1; 274 return RESPST_CLEANUP; 275 } 276 277 break; 278 279 case IB_QPT_UD: 280 case IB_QPT_SMI: 281 case IB_QPT_GSI: 282 break; 283 284 default: 285 WARN_ON_ONCE(1); 286 break; 287 } 288 289 return RESPST_CHK_RESOURCE; 290 } 291 292 static enum resp_states get_srq_wqe(struct rxe_qp *qp) 293 { 294 struct rxe_srq *srq = qp->srq; 295 struct rxe_queue *q = srq->rq.queue; 296 struct rxe_recv_wqe *wqe; 297 struct ib_event ev; 298 unsigned int count; 299 size_t size; 300 301 if (srq->error) 302 return RESPST_ERR_RNR; 303 304 spin_lock_bh(&srq->rq.consumer_lock); 305 306 wqe = queue_head(q, QUEUE_TYPE_FROM_CLIENT); 307 if (!wqe) { 308 spin_unlock_bh(&srq->rq.consumer_lock); 309 return RESPST_ERR_RNR; 310 } 311 312 /* don't trust user space data */ 313 if (unlikely(wqe->dma.num_sge > srq->rq.max_sge)) { 314 spin_unlock_bh(&srq->rq.consumer_lock); 315 pr_warn("%s: invalid num_sge in SRQ entry\n", __func__); 316 return RESPST_ERR_MALFORMED_WQE; 317 } 318 size = sizeof(*wqe) + wqe->dma.num_sge*sizeof(struct rxe_sge); 319 memcpy(&qp->resp.srq_wqe, wqe, size); 320 321 qp->resp.wqe = &qp->resp.srq_wqe.wqe; 322 queue_advance_consumer(q, QUEUE_TYPE_FROM_CLIENT); 323 count = queue_count(q, QUEUE_TYPE_FROM_CLIENT); 324 325 if (srq->limit && srq->ibsrq.event_handler && (count < srq->limit)) { 326 srq->limit = 0; 327 goto event; 328 } 329 330 spin_unlock_bh(&srq->rq.consumer_lock); 331 return RESPST_CHK_LENGTH; 332 333 event: 334 spin_unlock_bh(&srq->rq.consumer_lock); 335 ev.device = qp->ibqp.device; 336 ev.element.srq = qp->ibqp.srq; 337 ev.event = IB_EVENT_SRQ_LIMIT_REACHED; 338 srq->ibsrq.event_handler(&ev, srq->ibsrq.srq_context); 339 return RESPST_CHK_LENGTH; 340 } 341 342 static enum resp_states check_resource(struct rxe_qp *qp, 343 struct rxe_pkt_info *pkt) 344 { 345 struct rxe_srq *srq = qp->srq; 346 347 if (qp->resp.state == QP_STATE_ERROR) { 348 if (qp->resp.wqe) { 349 qp->resp.status = IB_WC_WR_FLUSH_ERR; 350 return RESPST_COMPLETE; 351 } else if (!srq) { 352 qp->resp.wqe = queue_head(qp->rq.queue, 353 QUEUE_TYPE_FROM_CLIENT); 354 if (qp->resp.wqe) { 355 qp->resp.status = IB_WC_WR_FLUSH_ERR; 356 return RESPST_COMPLETE; 357 } else { 358 return RESPST_EXIT; 359 } 360 } else { 361 return RESPST_EXIT; 362 } 363 } 364 365 if (pkt->mask & RXE_READ_OR_ATOMIC_MASK) { 366 /* it is the requesters job to not send 367 * too many read/atomic ops, we just 368 * recycle the responder resource queue 369 */ 370 if (likely(qp->attr.max_dest_rd_atomic > 0)) 371 return RESPST_CHK_LENGTH; 372 else 373 return RESPST_ERR_TOO_MANY_RDMA_ATM_REQ; 374 } 375 376 if (pkt->mask & RXE_RWR_MASK) { 377 if (srq) 378 return get_srq_wqe(qp); 379 380 qp->resp.wqe = queue_head(qp->rq.queue, 381 QUEUE_TYPE_FROM_CLIENT); 382 return (qp->resp.wqe) ? RESPST_CHK_LENGTH : RESPST_ERR_RNR; 383 } 384 385 return RESPST_CHK_LENGTH; 386 } 387 388 static enum resp_states check_length(struct rxe_qp *qp, 389 struct rxe_pkt_info *pkt) 390 { 391 switch (qp_type(qp)) { 392 case IB_QPT_RC: 393 return RESPST_CHK_RKEY; 394 395 case IB_QPT_UC: 396 return RESPST_CHK_RKEY; 397 398 default: 399 return RESPST_CHK_RKEY; 400 } 401 } 402 403 static enum resp_states check_rkey(struct rxe_qp *qp, 404 struct rxe_pkt_info *pkt) 405 { 406 struct rxe_mr *mr = NULL; 407 struct rxe_mw *mw = NULL; 408 u64 va; 409 u32 rkey; 410 u32 resid; 411 u32 pktlen; 412 int mtu = qp->mtu; 413 enum resp_states state; 414 int access; 415 416 if (pkt->mask & RXE_READ_OR_WRITE_MASK) { 417 if (pkt->mask & RXE_RETH_MASK) { 418 qp->resp.va = reth_va(pkt); 419 qp->resp.offset = 0; 420 qp->resp.rkey = reth_rkey(pkt); 421 qp->resp.resid = reth_len(pkt); 422 qp->resp.length = reth_len(pkt); 423 } 424 access = (pkt->mask & RXE_READ_MASK) ? IB_ACCESS_REMOTE_READ 425 : IB_ACCESS_REMOTE_WRITE; 426 } else if (pkt->mask & RXE_ATOMIC_MASK) { 427 qp->resp.va = atmeth_va(pkt); 428 qp->resp.offset = 0; 429 qp->resp.rkey = atmeth_rkey(pkt); 430 qp->resp.resid = sizeof(u64); 431 access = IB_ACCESS_REMOTE_ATOMIC; 432 } else { 433 return RESPST_EXECUTE; 434 } 435 436 /* A zero-byte op is not required to set an addr or rkey. */ 437 if ((pkt->mask & RXE_READ_OR_WRITE_MASK) && 438 (pkt->mask & RXE_RETH_MASK) && 439 reth_len(pkt) == 0) { 440 return RESPST_EXECUTE; 441 } 442 443 va = qp->resp.va; 444 rkey = qp->resp.rkey; 445 resid = qp->resp.resid; 446 pktlen = payload_size(pkt); 447 448 if (rkey_is_mw(rkey)) { 449 mw = rxe_lookup_mw(qp, access, rkey); 450 if (!mw) { 451 pr_err("%s: no MW matches rkey %#x\n", __func__, rkey); 452 state = RESPST_ERR_RKEY_VIOLATION; 453 goto err; 454 } 455 456 mr = mw->mr; 457 if (!mr) { 458 pr_err("%s: MW doesn't have an MR\n", __func__); 459 state = RESPST_ERR_RKEY_VIOLATION; 460 goto err; 461 } 462 463 if (mw->access & IB_ZERO_BASED) 464 qp->resp.offset = mw->addr; 465 466 rxe_drop_ref(mw); 467 rxe_add_ref(mr); 468 } else { 469 mr = lookup_mr(qp->pd, access, rkey, RXE_LOOKUP_REMOTE); 470 if (!mr) { 471 pr_err("%s: no MR matches rkey %#x\n", __func__, rkey); 472 state = RESPST_ERR_RKEY_VIOLATION; 473 goto err; 474 } 475 } 476 477 if (mr_check_range(mr, va + qp->resp.offset, resid)) { 478 state = RESPST_ERR_RKEY_VIOLATION; 479 goto err; 480 } 481 482 if (pkt->mask & RXE_WRITE_MASK) { 483 if (resid > mtu) { 484 if (pktlen != mtu || bth_pad(pkt)) { 485 state = RESPST_ERR_LENGTH; 486 goto err; 487 } 488 } else { 489 if (pktlen != resid) { 490 state = RESPST_ERR_LENGTH; 491 goto err; 492 } 493 if ((bth_pad(pkt) != (0x3 & (-resid)))) { 494 /* This case may not be exactly that 495 * but nothing else fits. 496 */ 497 state = RESPST_ERR_LENGTH; 498 goto err; 499 } 500 } 501 } 502 503 WARN_ON_ONCE(qp->resp.mr); 504 505 qp->resp.mr = mr; 506 return RESPST_EXECUTE; 507 508 err: 509 if (mr) 510 rxe_drop_ref(mr); 511 if (mw) 512 rxe_drop_ref(mw); 513 514 return state; 515 } 516 517 static enum resp_states send_data_in(struct rxe_qp *qp, void *data_addr, 518 int data_len) 519 { 520 int err; 521 522 err = copy_data(qp->pd, IB_ACCESS_LOCAL_WRITE, &qp->resp.wqe->dma, 523 data_addr, data_len, RXE_TO_MR_OBJ); 524 if (unlikely(err)) 525 return (err == -ENOSPC) ? RESPST_ERR_LENGTH 526 : RESPST_ERR_MALFORMED_WQE; 527 528 return RESPST_NONE; 529 } 530 531 static enum resp_states write_data_in(struct rxe_qp *qp, 532 struct rxe_pkt_info *pkt) 533 { 534 enum resp_states rc = RESPST_NONE; 535 int err; 536 int data_len = payload_size(pkt); 537 538 err = rxe_mr_copy(qp->resp.mr, qp->resp.va + qp->resp.offset, 539 payload_addr(pkt), data_len, RXE_TO_MR_OBJ); 540 if (err) { 541 rc = RESPST_ERR_RKEY_VIOLATION; 542 goto out; 543 } 544 545 qp->resp.va += data_len; 546 qp->resp.resid -= data_len; 547 548 out: 549 return rc; 550 } 551 552 /* Guarantee atomicity of atomic operations at the machine level. */ 553 static DEFINE_SPINLOCK(atomic_ops_lock); 554 555 static enum resp_states process_atomic(struct rxe_qp *qp, 556 struct rxe_pkt_info *pkt) 557 { 558 u64 *vaddr; 559 enum resp_states ret; 560 struct rxe_mr *mr = qp->resp.mr; 561 562 if (mr->state != RXE_MR_STATE_VALID) { 563 ret = RESPST_ERR_RKEY_VIOLATION; 564 goto out; 565 } 566 567 vaddr = iova_to_vaddr(mr, qp->resp.va + qp->resp.offset, sizeof(u64)); 568 569 /* check vaddr is 8 bytes aligned. */ 570 if (!vaddr || (uintptr_t)vaddr & 7) { 571 ret = RESPST_ERR_MISALIGNED_ATOMIC; 572 goto out; 573 } 574 575 spin_lock_bh(&atomic_ops_lock); 576 577 qp->resp.atomic_orig = *vaddr; 578 579 if (pkt->opcode == IB_OPCODE_RC_COMPARE_SWAP || 580 pkt->opcode == IB_OPCODE_RD_COMPARE_SWAP) { 581 if (*vaddr == atmeth_comp(pkt)) 582 *vaddr = atmeth_swap_add(pkt); 583 } else { 584 *vaddr += atmeth_swap_add(pkt); 585 } 586 587 spin_unlock_bh(&atomic_ops_lock); 588 589 ret = RESPST_NONE; 590 out: 591 return ret; 592 } 593 594 static struct sk_buff *prepare_ack_packet(struct rxe_qp *qp, 595 struct rxe_pkt_info *pkt, 596 struct rxe_pkt_info *ack, 597 int opcode, 598 int payload, 599 u32 psn, 600 u8 syndrome) 601 { 602 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 603 struct sk_buff *skb; 604 int paylen; 605 int pad; 606 int err; 607 608 /* 609 * allocate packet 610 */ 611 pad = (-payload) & 0x3; 612 paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE; 613 614 skb = rxe_init_packet(rxe, &qp->pri_av, paylen, ack); 615 if (!skb) 616 return NULL; 617 618 ack->qp = qp; 619 ack->opcode = opcode; 620 ack->mask = rxe_opcode[opcode].mask; 621 ack->paylen = paylen; 622 ack->psn = psn; 623 624 bth_init(ack, opcode, 0, 0, pad, IB_DEFAULT_PKEY_FULL, 625 qp->attr.dest_qp_num, 0, psn); 626 627 if (ack->mask & RXE_AETH_MASK) { 628 aeth_set_syn(ack, syndrome); 629 aeth_set_msn(ack, qp->resp.msn); 630 } 631 632 if (ack->mask & RXE_ATMACK_MASK) 633 atmack_set_orig(ack, qp->resp.atomic_orig); 634 635 err = rxe_prepare(ack, skb); 636 if (err) { 637 kfree_skb(skb); 638 return NULL; 639 } 640 641 return skb; 642 } 643 644 /* RDMA read response. If res is not NULL, then we have a current RDMA request 645 * being processed or replayed. 646 */ 647 static enum resp_states read_reply(struct rxe_qp *qp, 648 struct rxe_pkt_info *req_pkt) 649 { 650 struct rxe_pkt_info ack_pkt; 651 struct sk_buff *skb; 652 int mtu = qp->mtu; 653 enum resp_states state; 654 int payload; 655 int opcode; 656 int err; 657 struct resp_res *res = qp->resp.res; 658 659 if (!res) { 660 /* This is the first time we process that request. Get a 661 * resource 662 */ 663 res = &qp->resp.resources[qp->resp.res_head]; 664 665 free_rd_atomic_resource(qp, res); 666 rxe_advance_resp_resource(qp); 667 668 res->type = RXE_READ_MASK; 669 res->replay = 0; 670 671 res->read.va = qp->resp.va + 672 qp->resp.offset; 673 res->read.va_org = qp->resp.va + 674 qp->resp.offset; 675 676 res->first_psn = req_pkt->psn; 677 678 if (reth_len(req_pkt)) { 679 res->last_psn = (req_pkt->psn + 680 (reth_len(req_pkt) + mtu - 1) / 681 mtu - 1) & BTH_PSN_MASK; 682 } else { 683 res->last_psn = res->first_psn; 684 } 685 res->cur_psn = req_pkt->psn; 686 687 res->read.resid = qp->resp.resid; 688 res->read.length = qp->resp.resid; 689 res->read.rkey = qp->resp.rkey; 690 691 /* note res inherits the reference to mr from qp */ 692 res->read.mr = qp->resp.mr; 693 qp->resp.mr = NULL; 694 695 qp->resp.res = res; 696 res->state = rdatm_res_state_new; 697 } 698 699 if (res->state == rdatm_res_state_new) { 700 if (res->read.resid <= mtu) 701 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_ONLY; 702 else 703 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST; 704 } else { 705 if (res->read.resid > mtu) 706 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE; 707 else 708 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_LAST; 709 } 710 711 res->state = rdatm_res_state_next; 712 713 payload = min_t(int, res->read.resid, mtu); 714 715 skb = prepare_ack_packet(qp, req_pkt, &ack_pkt, opcode, payload, 716 res->cur_psn, AETH_ACK_UNLIMITED); 717 if (!skb) 718 return RESPST_ERR_RNR; 719 720 err = rxe_mr_copy(res->read.mr, res->read.va, payload_addr(&ack_pkt), 721 payload, RXE_FROM_MR_OBJ); 722 if (err) 723 pr_err("Failed copying memory\n"); 724 725 if (bth_pad(&ack_pkt)) { 726 u8 *pad = payload_addr(&ack_pkt) + payload; 727 728 memset(pad, 0, bth_pad(&ack_pkt)); 729 } 730 731 err = rxe_xmit_packet(qp, &ack_pkt, skb); 732 if (err) { 733 pr_err("Failed sending RDMA reply.\n"); 734 return RESPST_ERR_RNR; 735 } 736 737 res->read.va += payload; 738 res->read.resid -= payload; 739 res->cur_psn = (res->cur_psn + 1) & BTH_PSN_MASK; 740 741 if (res->read.resid > 0) { 742 state = RESPST_DONE; 743 } else { 744 qp->resp.res = NULL; 745 if (!res->replay) 746 qp->resp.opcode = -1; 747 if (psn_compare(res->cur_psn, qp->resp.psn) >= 0) 748 qp->resp.psn = res->cur_psn; 749 state = RESPST_CLEANUP; 750 } 751 752 return state; 753 } 754 755 static int invalidate_rkey(struct rxe_qp *qp, u32 rkey) 756 { 757 if (rkey_is_mw(rkey)) 758 return rxe_invalidate_mw(qp, rkey); 759 else 760 return rxe_invalidate_mr(qp, rkey); 761 } 762 763 /* Executes a new request. A retried request never reach that function (send 764 * and writes are discarded, and reads and atomics are retried elsewhere. 765 */ 766 static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt) 767 { 768 enum resp_states err; 769 struct sk_buff *skb = PKT_TO_SKB(pkt); 770 union rdma_network_hdr hdr; 771 772 if (pkt->mask & RXE_SEND_MASK) { 773 if (qp_type(qp) == IB_QPT_UD || 774 qp_type(qp) == IB_QPT_SMI || 775 qp_type(qp) == IB_QPT_GSI) { 776 if (skb->protocol == htons(ETH_P_IP)) { 777 memset(&hdr.reserved, 0, 778 sizeof(hdr.reserved)); 779 memcpy(&hdr.roce4grh, ip_hdr(skb), 780 sizeof(hdr.roce4grh)); 781 err = send_data_in(qp, &hdr, sizeof(hdr)); 782 } else { 783 err = send_data_in(qp, ipv6_hdr(skb), 784 sizeof(hdr)); 785 } 786 if (err) 787 return err; 788 } 789 err = send_data_in(qp, payload_addr(pkt), payload_size(pkt)); 790 if (err) 791 return err; 792 } else if (pkt->mask & RXE_WRITE_MASK) { 793 err = write_data_in(qp, pkt); 794 if (err) 795 return err; 796 } else if (pkt->mask & RXE_READ_MASK) { 797 /* For RDMA Read we can increment the msn now. See C9-148. */ 798 qp->resp.msn++; 799 return RESPST_READ_REPLY; 800 } else if (pkt->mask & RXE_ATOMIC_MASK) { 801 err = process_atomic(qp, pkt); 802 if (err) 803 return err; 804 } else { 805 /* Unreachable */ 806 WARN_ON_ONCE(1); 807 } 808 809 if (pkt->mask & RXE_IETH_MASK) { 810 u32 rkey = ieth_rkey(pkt); 811 812 err = invalidate_rkey(qp, rkey); 813 if (err) 814 return RESPST_ERR_INVALIDATE_RKEY; 815 } 816 817 /* next expected psn, read handles this separately */ 818 qp->resp.psn = (pkt->psn + 1) & BTH_PSN_MASK; 819 qp->resp.ack_psn = qp->resp.psn; 820 821 qp->resp.opcode = pkt->opcode; 822 qp->resp.status = IB_WC_SUCCESS; 823 824 if (pkt->mask & RXE_COMP_MASK) { 825 /* We successfully processed this new request. */ 826 qp->resp.msn++; 827 return RESPST_COMPLETE; 828 } else if (qp_type(qp) == IB_QPT_RC) 829 return RESPST_ACKNOWLEDGE; 830 else 831 return RESPST_CLEANUP; 832 } 833 834 static enum resp_states do_complete(struct rxe_qp *qp, 835 struct rxe_pkt_info *pkt) 836 { 837 struct rxe_cqe cqe; 838 struct ib_wc *wc = &cqe.ibwc; 839 struct ib_uverbs_wc *uwc = &cqe.uibwc; 840 struct rxe_recv_wqe *wqe = qp->resp.wqe; 841 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 842 843 if (!wqe) 844 goto finish; 845 846 memset(&cqe, 0, sizeof(cqe)); 847 848 if (qp->rcq->is_user) { 849 uwc->status = qp->resp.status; 850 uwc->qp_num = qp->ibqp.qp_num; 851 uwc->wr_id = wqe->wr_id; 852 } else { 853 wc->status = qp->resp.status; 854 wc->qp = &qp->ibqp; 855 wc->wr_id = wqe->wr_id; 856 } 857 858 if (wc->status == IB_WC_SUCCESS) { 859 rxe_counter_inc(rxe, RXE_CNT_RDMA_RECV); 860 wc->opcode = (pkt->mask & RXE_IMMDT_MASK && 861 pkt->mask & RXE_WRITE_MASK) ? 862 IB_WC_RECV_RDMA_WITH_IMM : IB_WC_RECV; 863 wc->byte_len = (pkt->mask & RXE_IMMDT_MASK && 864 pkt->mask & RXE_WRITE_MASK) ? 865 qp->resp.length : wqe->dma.length - wqe->dma.resid; 866 867 /* fields after byte_len are different between kernel and user 868 * space 869 */ 870 if (qp->rcq->is_user) { 871 uwc->wc_flags = IB_WC_GRH; 872 873 if (pkt->mask & RXE_IMMDT_MASK) { 874 uwc->wc_flags |= IB_WC_WITH_IMM; 875 uwc->ex.imm_data = immdt_imm(pkt); 876 } 877 878 if (pkt->mask & RXE_IETH_MASK) { 879 uwc->wc_flags |= IB_WC_WITH_INVALIDATE; 880 uwc->ex.invalidate_rkey = ieth_rkey(pkt); 881 } 882 883 if (pkt->mask & RXE_DETH_MASK) 884 uwc->src_qp = deth_sqp(pkt); 885 886 uwc->port_num = qp->attr.port_num; 887 } else { 888 struct sk_buff *skb = PKT_TO_SKB(pkt); 889 890 wc->wc_flags = IB_WC_GRH | IB_WC_WITH_NETWORK_HDR_TYPE; 891 if (skb->protocol == htons(ETH_P_IP)) 892 wc->network_hdr_type = RDMA_NETWORK_IPV4; 893 else 894 wc->network_hdr_type = RDMA_NETWORK_IPV6; 895 896 if (is_vlan_dev(skb->dev)) { 897 wc->wc_flags |= IB_WC_WITH_VLAN; 898 wc->vlan_id = vlan_dev_vlan_id(skb->dev); 899 } 900 901 if (pkt->mask & RXE_IMMDT_MASK) { 902 wc->wc_flags |= IB_WC_WITH_IMM; 903 wc->ex.imm_data = immdt_imm(pkt); 904 } 905 906 if (pkt->mask & RXE_IETH_MASK) { 907 wc->wc_flags |= IB_WC_WITH_INVALIDATE; 908 wc->ex.invalidate_rkey = ieth_rkey(pkt); 909 } 910 911 if (pkt->mask & RXE_DETH_MASK) 912 wc->src_qp = deth_sqp(pkt); 913 914 wc->port_num = qp->attr.port_num; 915 } 916 } 917 918 /* have copy for srq and reference for !srq */ 919 if (!qp->srq) 920 queue_advance_consumer(qp->rq.queue, QUEUE_TYPE_FROM_CLIENT); 921 922 qp->resp.wqe = NULL; 923 924 if (rxe_cq_post(qp->rcq, &cqe, pkt ? bth_se(pkt) : 1)) 925 return RESPST_ERR_CQ_OVERFLOW; 926 927 finish: 928 if (unlikely(qp->resp.state == QP_STATE_ERROR)) 929 return RESPST_CHK_RESOURCE; 930 if (unlikely(!pkt)) 931 return RESPST_DONE; 932 if (qp_type(qp) == IB_QPT_RC) 933 return RESPST_ACKNOWLEDGE; 934 else 935 return RESPST_CLEANUP; 936 } 937 938 static int send_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt, 939 u8 syndrome, u32 psn) 940 { 941 int err = 0; 942 struct rxe_pkt_info ack_pkt; 943 struct sk_buff *skb; 944 945 skb = prepare_ack_packet(qp, pkt, &ack_pkt, IB_OPCODE_RC_ACKNOWLEDGE, 946 0, psn, syndrome); 947 if (!skb) { 948 err = -ENOMEM; 949 goto err1; 950 } 951 952 err = rxe_xmit_packet(qp, &ack_pkt, skb); 953 if (err) 954 pr_err_ratelimited("Failed sending ack\n"); 955 956 err1: 957 return err; 958 } 959 960 static int send_atomic_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt, 961 u8 syndrome) 962 { 963 int rc = 0; 964 struct rxe_pkt_info ack_pkt; 965 struct sk_buff *skb; 966 struct resp_res *res; 967 968 skb = prepare_ack_packet(qp, pkt, &ack_pkt, 969 IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE, 0, pkt->psn, 970 syndrome); 971 if (!skb) { 972 rc = -ENOMEM; 973 goto out; 974 } 975 976 res = &qp->resp.resources[qp->resp.res_head]; 977 free_rd_atomic_resource(qp, res); 978 rxe_advance_resp_resource(qp); 979 980 skb_get(skb); 981 res->type = RXE_ATOMIC_MASK; 982 res->atomic.skb = skb; 983 res->first_psn = ack_pkt.psn; 984 res->last_psn = ack_pkt.psn; 985 res->cur_psn = ack_pkt.psn; 986 987 rc = rxe_xmit_packet(qp, &ack_pkt, skb); 988 if (rc) { 989 pr_err_ratelimited("Failed sending ack\n"); 990 rxe_drop_ref(qp); 991 } 992 out: 993 return rc; 994 } 995 996 static enum resp_states acknowledge(struct rxe_qp *qp, 997 struct rxe_pkt_info *pkt) 998 { 999 if (qp_type(qp) != IB_QPT_RC) 1000 return RESPST_CLEANUP; 1001 1002 if (qp->resp.aeth_syndrome != AETH_ACK_UNLIMITED) 1003 send_ack(qp, pkt, qp->resp.aeth_syndrome, pkt->psn); 1004 else if (pkt->mask & RXE_ATOMIC_MASK) 1005 send_atomic_ack(qp, pkt, AETH_ACK_UNLIMITED); 1006 else if (bth_ack(pkt)) 1007 send_ack(qp, pkt, AETH_ACK_UNLIMITED, pkt->psn); 1008 1009 return RESPST_CLEANUP; 1010 } 1011 1012 static enum resp_states cleanup(struct rxe_qp *qp, 1013 struct rxe_pkt_info *pkt) 1014 { 1015 struct sk_buff *skb; 1016 1017 if (pkt) { 1018 skb = skb_dequeue(&qp->req_pkts); 1019 rxe_drop_ref(qp); 1020 kfree_skb(skb); 1021 ib_device_put(qp->ibqp.device); 1022 } 1023 1024 if (qp->resp.mr) { 1025 rxe_drop_ref(qp->resp.mr); 1026 qp->resp.mr = NULL; 1027 } 1028 1029 return RESPST_DONE; 1030 } 1031 1032 static struct resp_res *find_resource(struct rxe_qp *qp, u32 psn) 1033 { 1034 int i; 1035 1036 for (i = 0; i < qp->attr.max_dest_rd_atomic; i++) { 1037 struct resp_res *res = &qp->resp.resources[i]; 1038 1039 if (res->type == 0) 1040 continue; 1041 1042 if (psn_compare(psn, res->first_psn) >= 0 && 1043 psn_compare(psn, res->last_psn) <= 0) { 1044 return res; 1045 } 1046 } 1047 1048 return NULL; 1049 } 1050 1051 static enum resp_states duplicate_request(struct rxe_qp *qp, 1052 struct rxe_pkt_info *pkt) 1053 { 1054 enum resp_states rc; 1055 u32 prev_psn = (qp->resp.ack_psn - 1) & BTH_PSN_MASK; 1056 1057 if (pkt->mask & RXE_SEND_MASK || 1058 pkt->mask & RXE_WRITE_MASK) { 1059 /* SEND. Ack again and cleanup. C9-105. */ 1060 send_ack(qp, pkt, AETH_ACK_UNLIMITED, prev_psn); 1061 return RESPST_CLEANUP; 1062 } else if (pkt->mask & RXE_READ_MASK) { 1063 struct resp_res *res; 1064 1065 res = find_resource(qp, pkt->psn); 1066 if (!res) { 1067 /* Resource not found. Class D error. Drop the 1068 * request. 1069 */ 1070 rc = RESPST_CLEANUP; 1071 goto out; 1072 } else { 1073 /* Ensure this new request is the same as the previous 1074 * one or a subset of it. 1075 */ 1076 u64 iova = reth_va(pkt); 1077 u32 resid = reth_len(pkt); 1078 1079 if (iova < res->read.va_org || 1080 resid > res->read.length || 1081 (iova + resid) > (res->read.va_org + 1082 res->read.length)) { 1083 rc = RESPST_CLEANUP; 1084 goto out; 1085 } 1086 1087 if (reth_rkey(pkt) != res->read.rkey) { 1088 rc = RESPST_CLEANUP; 1089 goto out; 1090 } 1091 1092 res->cur_psn = pkt->psn; 1093 res->state = (pkt->psn == res->first_psn) ? 1094 rdatm_res_state_new : 1095 rdatm_res_state_replay; 1096 res->replay = 1; 1097 1098 /* Reset the resource, except length. */ 1099 res->read.va_org = iova; 1100 res->read.va = iova; 1101 res->read.resid = resid; 1102 1103 /* Replay the RDMA read reply. */ 1104 qp->resp.res = res; 1105 rc = RESPST_READ_REPLY; 1106 goto out; 1107 } 1108 } else { 1109 struct resp_res *res; 1110 1111 /* Find the operation in our list of responder resources. */ 1112 res = find_resource(qp, pkt->psn); 1113 if (res) { 1114 skb_get(res->atomic.skb); 1115 /* Resend the result. */ 1116 rc = rxe_xmit_packet(qp, pkt, res->atomic.skb); 1117 if (rc) { 1118 pr_err("Failed resending result. This flow is not handled - skb ignored\n"); 1119 rc = RESPST_CLEANUP; 1120 goto out; 1121 } 1122 } 1123 1124 /* Resource not found. Class D error. Drop the request. */ 1125 rc = RESPST_CLEANUP; 1126 goto out; 1127 } 1128 out: 1129 return rc; 1130 } 1131 1132 /* Process a class A or C. Both are treated the same in this implementation. */ 1133 static void do_class_ac_error(struct rxe_qp *qp, u8 syndrome, 1134 enum ib_wc_status status) 1135 { 1136 qp->resp.aeth_syndrome = syndrome; 1137 qp->resp.status = status; 1138 1139 /* indicate that we should go through the ERROR state */ 1140 qp->resp.goto_error = 1; 1141 } 1142 1143 static enum resp_states do_class_d1e_error(struct rxe_qp *qp) 1144 { 1145 /* UC */ 1146 if (qp->srq) { 1147 /* Class E */ 1148 qp->resp.drop_msg = 1; 1149 if (qp->resp.wqe) { 1150 qp->resp.status = IB_WC_REM_INV_REQ_ERR; 1151 return RESPST_COMPLETE; 1152 } else { 1153 return RESPST_CLEANUP; 1154 } 1155 } else { 1156 /* Class D1. This packet may be the start of a 1157 * new message and could be valid. The previous 1158 * message is invalid and ignored. reset the 1159 * recv wr to its original state 1160 */ 1161 if (qp->resp.wqe) { 1162 qp->resp.wqe->dma.resid = qp->resp.wqe->dma.length; 1163 qp->resp.wqe->dma.cur_sge = 0; 1164 qp->resp.wqe->dma.sge_offset = 0; 1165 qp->resp.opcode = -1; 1166 } 1167 1168 if (qp->resp.mr) { 1169 rxe_drop_ref(qp->resp.mr); 1170 qp->resp.mr = NULL; 1171 } 1172 1173 return RESPST_CLEANUP; 1174 } 1175 } 1176 1177 static void rxe_drain_req_pkts(struct rxe_qp *qp, bool notify) 1178 { 1179 struct sk_buff *skb; 1180 struct rxe_queue *q = qp->rq.queue; 1181 1182 while ((skb = skb_dequeue(&qp->req_pkts))) { 1183 rxe_drop_ref(qp); 1184 kfree_skb(skb); 1185 ib_device_put(qp->ibqp.device); 1186 } 1187 1188 if (notify) 1189 return; 1190 1191 while (!qp->srq && q && queue_head(q, q->type)) 1192 queue_advance_consumer(q, q->type); 1193 } 1194 1195 int rxe_responder(void *arg) 1196 { 1197 struct rxe_qp *qp = (struct rxe_qp *)arg; 1198 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 1199 enum resp_states state; 1200 struct rxe_pkt_info *pkt = NULL; 1201 int ret = 0; 1202 1203 rxe_add_ref(qp); 1204 1205 qp->resp.aeth_syndrome = AETH_ACK_UNLIMITED; 1206 1207 if (!qp->valid) { 1208 ret = -EINVAL; 1209 goto done; 1210 } 1211 1212 switch (qp->resp.state) { 1213 case QP_STATE_RESET: 1214 state = RESPST_RESET; 1215 break; 1216 1217 default: 1218 state = RESPST_GET_REQ; 1219 break; 1220 } 1221 1222 while (1) { 1223 pr_debug("qp#%d state = %s\n", qp_num(qp), 1224 resp_state_name[state]); 1225 switch (state) { 1226 case RESPST_GET_REQ: 1227 state = get_req(qp, &pkt); 1228 break; 1229 case RESPST_CHK_PSN: 1230 state = check_psn(qp, pkt); 1231 break; 1232 case RESPST_CHK_OP_SEQ: 1233 state = check_op_seq(qp, pkt); 1234 break; 1235 case RESPST_CHK_OP_VALID: 1236 state = check_op_valid(qp, pkt); 1237 break; 1238 case RESPST_CHK_RESOURCE: 1239 state = check_resource(qp, pkt); 1240 break; 1241 case RESPST_CHK_LENGTH: 1242 state = check_length(qp, pkt); 1243 break; 1244 case RESPST_CHK_RKEY: 1245 state = check_rkey(qp, pkt); 1246 break; 1247 case RESPST_EXECUTE: 1248 state = execute(qp, pkt); 1249 break; 1250 case RESPST_COMPLETE: 1251 state = do_complete(qp, pkt); 1252 break; 1253 case RESPST_READ_REPLY: 1254 state = read_reply(qp, pkt); 1255 break; 1256 case RESPST_ACKNOWLEDGE: 1257 state = acknowledge(qp, pkt); 1258 break; 1259 case RESPST_CLEANUP: 1260 state = cleanup(qp, pkt); 1261 break; 1262 case RESPST_DUPLICATE_REQUEST: 1263 state = duplicate_request(qp, pkt); 1264 break; 1265 case RESPST_ERR_PSN_OUT_OF_SEQ: 1266 /* RC only - Class B. Drop packet. */ 1267 send_ack(qp, pkt, AETH_NAK_PSN_SEQ_ERROR, qp->resp.psn); 1268 state = RESPST_CLEANUP; 1269 break; 1270 1271 case RESPST_ERR_TOO_MANY_RDMA_ATM_REQ: 1272 case RESPST_ERR_MISSING_OPCODE_FIRST: 1273 case RESPST_ERR_MISSING_OPCODE_LAST_C: 1274 case RESPST_ERR_UNSUPPORTED_OPCODE: 1275 case RESPST_ERR_MISALIGNED_ATOMIC: 1276 /* RC Only - Class C. */ 1277 do_class_ac_error(qp, AETH_NAK_INVALID_REQ, 1278 IB_WC_REM_INV_REQ_ERR); 1279 state = RESPST_COMPLETE; 1280 break; 1281 1282 case RESPST_ERR_MISSING_OPCODE_LAST_D1E: 1283 state = do_class_d1e_error(qp); 1284 break; 1285 case RESPST_ERR_RNR: 1286 if (qp_type(qp) == IB_QPT_RC) { 1287 rxe_counter_inc(rxe, RXE_CNT_SND_RNR); 1288 /* RC - class B */ 1289 send_ack(qp, pkt, AETH_RNR_NAK | 1290 (~AETH_TYPE_MASK & 1291 qp->attr.min_rnr_timer), 1292 pkt->psn); 1293 } else { 1294 /* UD/UC - class D */ 1295 qp->resp.drop_msg = 1; 1296 } 1297 state = RESPST_CLEANUP; 1298 break; 1299 1300 case RESPST_ERR_RKEY_VIOLATION: 1301 if (qp_type(qp) == IB_QPT_RC) { 1302 /* Class C */ 1303 do_class_ac_error(qp, AETH_NAK_REM_ACC_ERR, 1304 IB_WC_REM_ACCESS_ERR); 1305 state = RESPST_COMPLETE; 1306 } else { 1307 qp->resp.drop_msg = 1; 1308 if (qp->srq) { 1309 /* UC/SRQ Class D */ 1310 qp->resp.status = IB_WC_REM_ACCESS_ERR; 1311 state = RESPST_COMPLETE; 1312 } else { 1313 /* UC/non-SRQ Class E. */ 1314 state = RESPST_CLEANUP; 1315 } 1316 } 1317 break; 1318 1319 case RESPST_ERR_INVALIDATE_RKEY: 1320 /* RC - Class J. */ 1321 qp->resp.goto_error = 1; 1322 qp->resp.status = IB_WC_REM_INV_REQ_ERR; 1323 state = RESPST_COMPLETE; 1324 break; 1325 1326 case RESPST_ERR_LENGTH: 1327 if (qp_type(qp) == IB_QPT_RC) { 1328 /* Class C */ 1329 do_class_ac_error(qp, AETH_NAK_INVALID_REQ, 1330 IB_WC_REM_INV_REQ_ERR); 1331 state = RESPST_COMPLETE; 1332 } else if (qp->srq) { 1333 /* UC/UD - class E */ 1334 qp->resp.status = IB_WC_REM_INV_REQ_ERR; 1335 state = RESPST_COMPLETE; 1336 } else { 1337 /* UC/UD - class D */ 1338 qp->resp.drop_msg = 1; 1339 state = RESPST_CLEANUP; 1340 } 1341 break; 1342 1343 case RESPST_ERR_MALFORMED_WQE: 1344 /* All, Class A. */ 1345 do_class_ac_error(qp, AETH_NAK_REM_OP_ERR, 1346 IB_WC_LOC_QP_OP_ERR); 1347 state = RESPST_COMPLETE; 1348 break; 1349 1350 case RESPST_ERR_CQ_OVERFLOW: 1351 /* All - Class G */ 1352 state = RESPST_ERROR; 1353 break; 1354 1355 case RESPST_DONE: 1356 if (qp->resp.goto_error) { 1357 state = RESPST_ERROR; 1358 break; 1359 } 1360 1361 goto done; 1362 1363 case RESPST_EXIT: 1364 if (qp->resp.goto_error) { 1365 state = RESPST_ERROR; 1366 break; 1367 } 1368 1369 goto exit; 1370 1371 case RESPST_RESET: 1372 rxe_drain_req_pkts(qp, false); 1373 qp->resp.wqe = NULL; 1374 goto exit; 1375 1376 case RESPST_ERROR: 1377 qp->resp.goto_error = 0; 1378 pr_warn("qp#%d moved to error state\n", qp_num(qp)); 1379 rxe_qp_error(qp); 1380 goto exit; 1381 1382 default: 1383 WARN_ON_ONCE(1); 1384 } 1385 } 1386 1387 exit: 1388 ret = -EAGAIN; 1389 done: 1390 rxe_drop_ref(qp); 1391 return ret; 1392 } 1393