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_LENGTH, 39 RESPST_ERR_CQ_OVERFLOW, 40 RESPST_ERROR, 41 RESPST_RESET, 42 RESPST_DONE, 43 RESPST_EXIT, 44 }; 45 46 static char *resp_state_name[] = { 47 [RESPST_NONE] = "NONE", 48 [RESPST_GET_REQ] = "GET_REQ", 49 [RESPST_CHK_PSN] = "CHK_PSN", 50 [RESPST_CHK_OP_SEQ] = "CHK_OP_SEQ", 51 [RESPST_CHK_OP_VALID] = "CHK_OP_VALID", 52 [RESPST_CHK_RESOURCE] = "CHK_RESOURCE", 53 [RESPST_CHK_LENGTH] = "CHK_LENGTH", 54 [RESPST_CHK_RKEY] = "CHK_RKEY", 55 [RESPST_EXECUTE] = "EXECUTE", 56 [RESPST_READ_REPLY] = "READ_REPLY", 57 [RESPST_COMPLETE] = "COMPLETE", 58 [RESPST_ACKNOWLEDGE] = "ACKNOWLEDGE", 59 [RESPST_CLEANUP] = "CLEANUP", 60 [RESPST_DUPLICATE_REQUEST] = "DUPLICATE_REQUEST", 61 [RESPST_ERR_MALFORMED_WQE] = "ERR_MALFORMED_WQE", 62 [RESPST_ERR_UNSUPPORTED_OPCODE] = "ERR_UNSUPPORTED_OPCODE", 63 [RESPST_ERR_MISALIGNED_ATOMIC] = "ERR_MISALIGNED_ATOMIC", 64 [RESPST_ERR_PSN_OUT_OF_SEQ] = "ERR_PSN_OUT_OF_SEQ", 65 [RESPST_ERR_MISSING_OPCODE_FIRST] = "ERR_MISSING_OPCODE_FIRST", 66 [RESPST_ERR_MISSING_OPCODE_LAST_C] = "ERR_MISSING_OPCODE_LAST_C", 67 [RESPST_ERR_MISSING_OPCODE_LAST_D1E] = "ERR_MISSING_OPCODE_LAST_D1E", 68 [RESPST_ERR_TOO_MANY_RDMA_ATM_REQ] = "ERR_TOO_MANY_RDMA_ATM_REQ", 69 [RESPST_ERR_RNR] = "ERR_RNR", 70 [RESPST_ERR_RKEY_VIOLATION] = "ERR_RKEY_VIOLATION", 71 [RESPST_ERR_LENGTH] = "ERR_LENGTH", 72 [RESPST_ERR_CQ_OVERFLOW] = "ERR_CQ_OVERFLOW", 73 [RESPST_ERROR] = "ERROR", 74 [RESPST_RESET] = "RESET", 75 [RESPST_DONE] = "DONE", 76 [RESPST_EXIT] = "EXIT", 77 }; 78 79 /* rxe_recv calls here to add a request packet to the input queue */ 80 void rxe_resp_queue_pkt(struct rxe_qp *qp, struct sk_buff *skb) 81 { 82 int must_sched; 83 struct rxe_pkt_info *pkt = SKB_TO_PKT(skb); 84 85 skb_queue_tail(&qp->req_pkts, skb); 86 87 must_sched = (pkt->opcode == IB_OPCODE_RC_RDMA_READ_REQUEST) || 88 (skb_queue_len(&qp->req_pkts) > 1); 89 90 rxe_run_task(&qp->resp.task, must_sched); 91 } 92 93 static inline enum resp_states get_req(struct rxe_qp *qp, 94 struct rxe_pkt_info **pkt_p) 95 { 96 struct sk_buff *skb; 97 98 if (qp->resp.state == QP_STATE_ERROR) { 99 while ((skb = skb_dequeue(&qp->req_pkts))) { 100 rxe_drop_ref(qp); 101 kfree_skb(skb); 102 } 103 104 /* go drain recv wr queue */ 105 return RESPST_CHK_RESOURCE; 106 } 107 108 skb = skb_peek(&qp->req_pkts); 109 if (!skb) 110 return RESPST_EXIT; 111 112 *pkt_p = SKB_TO_PKT(skb); 113 114 return (qp->resp.res) ? RESPST_READ_REPLY : RESPST_CHK_PSN; 115 } 116 117 static enum resp_states check_psn(struct rxe_qp *qp, 118 struct rxe_pkt_info *pkt) 119 { 120 int diff = psn_compare(pkt->psn, qp->resp.psn); 121 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 122 123 switch (qp_type(qp)) { 124 case IB_QPT_RC: 125 if (diff > 0) { 126 if (qp->resp.sent_psn_nak) 127 return RESPST_CLEANUP; 128 129 qp->resp.sent_psn_nak = 1; 130 rxe_counter_inc(rxe, RXE_CNT_OUT_OF_SEQ_REQ); 131 return RESPST_ERR_PSN_OUT_OF_SEQ; 132 133 } else if (diff < 0) { 134 rxe_counter_inc(rxe, RXE_CNT_DUP_REQ); 135 return RESPST_DUPLICATE_REQUEST; 136 } 137 138 if (qp->resp.sent_psn_nak) 139 qp->resp.sent_psn_nak = 0; 140 141 break; 142 143 case IB_QPT_UC: 144 if (qp->resp.drop_msg || diff != 0) { 145 if (pkt->mask & RXE_START_MASK) { 146 qp->resp.drop_msg = 0; 147 return RESPST_CHK_OP_SEQ; 148 } 149 150 qp->resp.drop_msg = 1; 151 return RESPST_CLEANUP; 152 } 153 break; 154 default: 155 break; 156 } 157 158 return RESPST_CHK_OP_SEQ; 159 } 160 161 static enum resp_states check_op_seq(struct rxe_qp *qp, 162 struct rxe_pkt_info *pkt) 163 { 164 switch (qp_type(qp)) { 165 case IB_QPT_RC: 166 switch (qp->resp.opcode) { 167 case IB_OPCODE_RC_SEND_FIRST: 168 case IB_OPCODE_RC_SEND_MIDDLE: 169 switch (pkt->opcode) { 170 case IB_OPCODE_RC_SEND_MIDDLE: 171 case IB_OPCODE_RC_SEND_LAST: 172 case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE: 173 case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE: 174 return RESPST_CHK_OP_VALID; 175 default: 176 return RESPST_ERR_MISSING_OPCODE_LAST_C; 177 } 178 179 case IB_OPCODE_RC_RDMA_WRITE_FIRST: 180 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE: 181 switch (pkt->opcode) { 182 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE: 183 case IB_OPCODE_RC_RDMA_WRITE_LAST: 184 case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE: 185 return RESPST_CHK_OP_VALID; 186 default: 187 return RESPST_ERR_MISSING_OPCODE_LAST_C; 188 } 189 190 default: 191 switch (pkt->opcode) { 192 case IB_OPCODE_RC_SEND_MIDDLE: 193 case IB_OPCODE_RC_SEND_LAST: 194 case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE: 195 case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE: 196 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE: 197 case IB_OPCODE_RC_RDMA_WRITE_LAST: 198 case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE: 199 return RESPST_ERR_MISSING_OPCODE_FIRST; 200 default: 201 return RESPST_CHK_OP_VALID; 202 } 203 } 204 break; 205 206 case IB_QPT_UC: 207 switch (qp->resp.opcode) { 208 case IB_OPCODE_UC_SEND_FIRST: 209 case IB_OPCODE_UC_SEND_MIDDLE: 210 switch (pkt->opcode) { 211 case IB_OPCODE_UC_SEND_MIDDLE: 212 case IB_OPCODE_UC_SEND_LAST: 213 case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE: 214 return RESPST_CHK_OP_VALID; 215 default: 216 return RESPST_ERR_MISSING_OPCODE_LAST_D1E; 217 } 218 219 case IB_OPCODE_UC_RDMA_WRITE_FIRST: 220 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE: 221 switch (pkt->opcode) { 222 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE: 223 case IB_OPCODE_UC_RDMA_WRITE_LAST: 224 case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE: 225 return RESPST_CHK_OP_VALID; 226 default: 227 return RESPST_ERR_MISSING_OPCODE_LAST_D1E; 228 } 229 230 default: 231 switch (pkt->opcode) { 232 case IB_OPCODE_UC_SEND_MIDDLE: 233 case IB_OPCODE_UC_SEND_LAST: 234 case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE: 235 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE: 236 case IB_OPCODE_UC_RDMA_WRITE_LAST: 237 case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE: 238 qp->resp.drop_msg = 1; 239 return RESPST_CLEANUP; 240 default: 241 return RESPST_CHK_OP_VALID; 242 } 243 } 244 break; 245 246 default: 247 return RESPST_CHK_OP_VALID; 248 } 249 } 250 251 static enum resp_states check_op_valid(struct rxe_qp *qp, 252 struct rxe_pkt_info *pkt) 253 { 254 switch (qp_type(qp)) { 255 case IB_QPT_RC: 256 if (((pkt->mask & RXE_READ_MASK) && 257 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_READ)) || 258 ((pkt->mask & RXE_WRITE_MASK) && 259 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) || 260 ((pkt->mask & RXE_ATOMIC_MASK) && 261 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) { 262 return RESPST_ERR_UNSUPPORTED_OPCODE; 263 } 264 265 break; 266 267 case IB_QPT_UC: 268 if ((pkt->mask & RXE_WRITE_MASK) && 269 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) { 270 qp->resp.drop_msg = 1; 271 return RESPST_CLEANUP; 272 } 273 274 break; 275 276 case IB_QPT_UD: 277 case IB_QPT_SMI: 278 case IB_QPT_GSI: 279 break; 280 281 default: 282 WARN_ON_ONCE(1); 283 break; 284 } 285 286 return RESPST_CHK_RESOURCE; 287 } 288 289 static enum resp_states get_srq_wqe(struct rxe_qp *qp) 290 { 291 struct rxe_srq *srq = qp->srq; 292 struct rxe_queue *q = srq->rq.queue; 293 struct rxe_recv_wqe *wqe; 294 struct ib_event ev; 295 296 if (srq->error) 297 return RESPST_ERR_RNR; 298 299 spin_lock_bh(&srq->rq.consumer_lock); 300 301 wqe = queue_head(q); 302 if (!wqe) { 303 spin_unlock_bh(&srq->rq.consumer_lock); 304 return RESPST_ERR_RNR; 305 } 306 307 /* note kernel and user space recv wqes have same size */ 308 memcpy(&qp->resp.srq_wqe, wqe, sizeof(qp->resp.srq_wqe)); 309 310 qp->resp.wqe = &qp->resp.srq_wqe.wqe; 311 advance_consumer(q); 312 313 if (srq->limit && srq->ibsrq.event_handler && 314 (queue_count(q) < srq->limit)) { 315 srq->limit = 0; 316 goto event; 317 } 318 319 spin_unlock_bh(&srq->rq.consumer_lock); 320 return RESPST_CHK_LENGTH; 321 322 event: 323 spin_unlock_bh(&srq->rq.consumer_lock); 324 ev.device = qp->ibqp.device; 325 ev.element.srq = qp->ibqp.srq; 326 ev.event = IB_EVENT_SRQ_LIMIT_REACHED; 327 srq->ibsrq.event_handler(&ev, srq->ibsrq.srq_context); 328 return RESPST_CHK_LENGTH; 329 } 330 331 static enum resp_states check_resource(struct rxe_qp *qp, 332 struct rxe_pkt_info *pkt) 333 { 334 struct rxe_srq *srq = qp->srq; 335 336 if (qp->resp.state == QP_STATE_ERROR) { 337 if (qp->resp.wqe) { 338 qp->resp.status = IB_WC_WR_FLUSH_ERR; 339 return RESPST_COMPLETE; 340 } else if (!srq) { 341 qp->resp.wqe = queue_head(qp->rq.queue); 342 if (qp->resp.wqe) { 343 qp->resp.status = IB_WC_WR_FLUSH_ERR; 344 return RESPST_COMPLETE; 345 } else { 346 return RESPST_EXIT; 347 } 348 } else { 349 return RESPST_EXIT; 350 } 351 } 352 353 if (pkt->mask & RXE_READ_OR_ATOMIC) { 354 /* it is the requesters job to not send 355 * too many read/atomic ops, we just 356 * recycle the responder resource queue 357 */ 358 if (likely(qp->attr.max_dest_rd_atomic > 0)) 359 return RESPST_CHK_LENGTH; 360 else 361 return RESPST_ERR_TOO_MANY_RDMA_ATM_REQ; 362 } 363 364 if (pkt->mask & RXE_RWR_MASK) { 365 if (srq) 366 return get_srq_wqe(qp); 367 368 qp->resp.wqe = queue_head(qp->rq.queue); 369 return (qp->resp.wqe) ? RESPST_CHK_LENGTH : RESPST_ERR_RNR; 370 } 371 372 return RESPST_CHK_LENGTH; 373 } 374 375 static enum resp_states check_length(struct rxe_qp *qp, 376 struct rxe_pkt_info *pkt) 377 { 378 switch (qp_type(qp)) { 379 case IB_QPT_RC: 380 return RESPST_CHK_RKEY; 381 382 case IB_QPT_UC: 383 return RESPST_CHK_RKEY; 384 385 default: 386 return RESPST_CHK_RKEY; 387 } 388 } 389 390 static enum resp_states check_rkey(struct rxe_qp *qp, 391 struct rxe_pkt_info *pkt) 392 { 393 struct rxe_mem *mem = NULL; 394 u64 va; 395 u32 rkey; 396 u32 resid; 397 u32 pktlen; 398 int mtu = qp->mtu; 399 enum resp_states state; 400 int access; 401 402 if (pkt->mask & (RXE_READ_MASK | RXE_WRITE_MASK)) { 403 if (pkt->mask & RXE_RETH_MASK) { 404 qp->resp.va = reth_va(pkt); 405 qp->resp.rkey = reth_rkey(pkt); 406 qp->resp.resid = reth_len(pkt); 407 qp->resp.length = reth_len(pkt); 408 } 409 access = (pkt->mask & RXE_READ_MASK) ? IB_ACCESS_REMOTE_READ 410 : IB_ACCESS_REMOTE_WRITE; 411 } else if (pkt->mask & RXE_ATOMIC_MASK) { 412 qp->resp.va = atmeth_va(pkt); 413 qp->resp.rkey = atmeth_rkey(pkt); 414 qp->resp.resid = sizeof(u64); 415 access = IB_ACCESS_REMOTE_ATOMIC; 416 } else { 417 return RESPST_EXECUTE; 418 } 419 420 /* A zero-byte op is not required to set an addr or rkey. */ 421 if ((pkt->mask & (RXE_READ_MASK | RXE_WRITE_OR_SEND)) && 422 (pkt->mask & RXE_RETH_MASK) && 423 reth_len(pkt) == 0) { 424 return RESPST_EXECUTE; 425 } 426 427 va = qp->resp.va; 428 rkey = qp->resp.rkey; 429 resid = qp->resp.resid; 430 pktlen = payload_size(pkt); 431 432 mem = lookup_mem(qp->pd, access, rkey, lookup_remote); 433 if (!mem) { 434 state = RESPST_ERR_RKEY_VIOLATION; 435 goto err; 436 } 437 438 if (unlikely(mem->state == RXE_MEM_STATE_FREE)) { 439 state = RESPST_ERR_RKEY_VIOLATION; 440 goto err; 441 } 442 443 if (mem_check_range(mem, va, resid)) { 444 state = RESPST_ERR_RKEY_VIOLATION; 445 goto err; 446 } 447 448 if (pkt->mask & RXE_WRITE_MASK) { 449 if (resid > mtu) { 450 if (pktlen != mtu || bth_pad(pkt)) { 451 state = RESPST_ERR_LENGTH; 452 goto err; 453 } 454 } else { 455 if (pktlen != resid) { 456 state = RESPST_ERR_LENGTH; 457 goto err; 458 } 459 if ((bth_pad(pkt) != (0x3 & (-resid)))) { 460 /* This case may not be exactly that 461 * but nothing else fits. 462 */ 463 state = RESPST_ERR_LENGTH; 464 goto err; 465 } 466 } 467 } 468 469 WARN_ON_ONCE(qp->resp.mr); 470 471 qp->resp.mr = mem; 472 return RESPST_EXECUTE; 473 474 err: 475 if (mem) 476 rxe_drop_ref(mem); 477 return state; 478 } 479 480 static enum resp_states send_data_in(struct rxe_qp *qp, void *data_addr, 481 int data_len) 482 { 483 int err; 484 485 err = copy_data(qp->pd, IB_ACCESS_LOCAL_WRITE, &qp->resp.wqe->dma, 486 data_addr, data_len, to_mem_obj, NULL); 487 if (unlikely(err)) 488 return (err == -ENOSPC) ? RESPST_ERR_LENGTH 489 : RESPST_ERR_MALFORMED_WQE; 490 491 return RESPST_NONE; 492 } 493 494 static enum resp_states write_data_in(struct rxe_qp *qp, 495 struct rxe_pkt_info *pkt) 496 { 497 enum resp_states rc = RESPST_NONE; 498 int err; 499 int data_len = payload_size(pkt); 500 501 err = rxe_mem_copy(qp->resp.mr, qp->resp.va, payload_addr(pkt), 502 data_len, to_mem_obj, NULL); 503 if (err) { 504 rc = RESPST_ERR_RKEY_VIOLATION; 505 goto out; 506 } 507 508 qp->resp.va += data_len; 509 qp->resp.resid -= data_len; 510 511 out: 512 return rc; 513 } 514 515 /* Guarantee atomicity of atomic operations at the machine level. */ 516 static DEFINE_SPINLOCK(atomic_ops_lock); 517 518 static enum resp_states process_atomic(struct rxe_qp *qp, 519 struct rxe_pkt_info *pkt) 520 { 521 u64 iova = atmeth_va(pkt); 522 u64 *vaddr; 523 enum resp_states ret; 524 struct rxe_mem *mr = qp->resp.mr; 525 526 if (mr->state != RXE_MEM_STATE_VALID) { 527 ret = RESPST_ERR_RKEY_VIOLATION; 528 goto out; 529 } 530 531 vaddr = iova_to_vaddr(mr, iova, sizeof(u64)); 532 533 /* check vaddr is 8 bytes aligned. */ 534 if (!vaddr || (uintptr_t)vaddr & 7) { 535 ret = RESPST_ERR_MISALIGNED_ATOMIC; 536 goto out; 537 } 538 539 spin_lock_bh(&atomic_ops_lock); 540 541 qp->resp.atomic_orig = *vaddr; 542 543 if (pkt->opcode == IB_OPCODE_RC_COMPARE_SWAP || 544 pkt->opcode == IB_OPCODE_RD_COMPARE_SWAP) { 545 if (*vaddr == atmeth_comp(pkt)) 546 *vaddr = atmeth_swap_add(pkt); 547 } else { 548 *vaddr += atmeth_swap_add(pkt); 549 } 550 551 spin_unlock_bh(&atomic_ops_lock); 552 553 ret = RESPST_NONE; 554 out: 555 return ret; 556 } 557 558 static struct sk_buff *prepare_ack_packet(struct rxe_qp *qp, 559 struct rxe_pkt_info *pkt, 560 struct rxe_pkt_info *ack, 561 int opcode, 562 int payload, 563 u32 psn, 564 u8 syndrome, 565 u32 *crcp) 566 { 567 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 568 struct sk_buff *skb; 569 u32 crc = 0; 570 u32 *p; 571 int paylen; 572 int pad; 573 int err; 574 575 /* 576 * allocate packet 577 */ 578 pad = (-payload) & 0x3; 579 paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE; 580 581 skb = rxe_init_packet(rxe, &qp->pri_av, paylen, ack); 582 if (!skb) 583 return NULL; 584 585 ack->qp = qp; 586 ack->opcode = opcode; 587 ack->mask = rxe_opcode[opcode].mask; 588 ack->offset = pkt->offset; 589 ack->paylen = paylen; 590 591 /* fill in bth using the request packet headers */ 592 memcpy(ack->hdr, pkt->hdr, pkt->offset + RXE_BTH_BYTES); 593 594 bth_set_opcode(ack, opcode); 595 bth_set_qpn(ack, qp->attr.dest_qp_num); 596 bth_set_pad(ack, pad); 597 bth_set_se(ack, 0); 598 bth_set_psn(ack, psn); 599 bth_set_ack(ack, 0); 600 ack->psn = psn; 601 602 if (ack->mask & RXE_AETH_MASK) { 603 aeth_set_syn(ack, syndrome); 604 aeth_set_msn(ack, qp->resp.msn); 605 } 606 607 if (ack->mask & RXE_ATMACK_MASK) 608 atmack_set_orig(ack, qp->resp.atomic_orig); 609 610 err = rxe_prepare(ack, skb, &crc); 611 if (err) { 612 kfree_skb(skb); 613 return NULL; 614 } 615 616 if (crcp) { 617 /* CRC computation will be continued by the caller */ 618 *crcp = crc; 619 } else { 620 p = payload_addr(ack) + payload + bth_pad(ack); 621 *p = ~crc; 622 } 623 624 return skb; 625 } 626 627 /* RDMA read response. If res is not NULL, then we have a current RDMA request 628 * being processed or replayed. 629 */ 630 static enum resp_states read_reply(struct rxe_qp *qp, 631 struct rxe_pkt_info *req_pkt) 632 { 633 struct rxe_pkt_info ack_pkt; 634 struct sk_buff *skb; 635 int mtu = qp->mtu; 636 enum resp_states state; 637 int payload; 638 int opcode; 639 int err; 640 struct resp_res *res = qp->resp.res; 641 u32 icrc; 642 u32 *p; 643 644 if (!res) { 645 /* This is the first time we process that request. Get a 646 * resource 647 */ 648 res = &qp->resp.resources[qp->resp.res_head]; 649 650 free_rd_atomic_resource(qp, res); 651 rxe_advance_resp_resource(qp); 652 653 res->type = RXE_READ_MASK; 654 res->replay = 0; 655 656 res->read.va = qp->resp.va; 657 res->read.va_org = qp->resp.va; 658 659 res->first_psn = req_pkt->psn; 660 661 if (reth_len(req_pkt)) { 662 res->last_psn = (req_pkt->psn + 663 (reth_len(req_pkt) + mtu - 1) / 664 mtu - 1) & BTH_PSN_MASK; 665 } else { 666 res->last_psn = res->first_psn; 667 } 668 res->cur_psn = req_pkt->psn; 669 670 res->read.resid = qp->resp.resid; 671 res->read.length = qp->resp.resid; 672 res->read.rkey = qp->resp.rkey; 673 674 /* note res inherits the reference to mr from qp */ 675 res->read.mr = qp->resp.mr; 676 qp->resp.mr = NULL; 677 678 qp->resp.res = res; 679 res->state = rdatm_res_state_new; 680 } 681 682 if (res->state == rdatm_res_state_new) { 683 if (res->read.resid <= mtu) 684 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_ONLY; 685 else 686 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST; 687 } else { 688 if (res->read.resid > mtu) 689 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE; 690 else 691 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_LAST; 692 } 693 694 res->state = rdatm_res_state_next; 695 696 payload = min_t(int, res->read.resid, mtu); 697 698 skb = prepare_ack_packet(qp, req_pkt, &ack_pkt, opcode, payload, 699 res->cur_psn, AETH_ACK_UNLIMITED, &icrc); 700 if (!skb) 701 return RESPST_ERR_RNR; 702 703 err = rxe_mem_copy(res->read.mr, res->read.va, payload_addr(&ack_pkt), 704 payload, from_mem_obj, &icrc); 705 if (err) 706 pr_err("Failed copying memory\n"); 707 708 if (bth_pad(&ack_pkt)) { 709 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 710 u8 *pad = payload_addr(&ack_pkt) + payload; 711 712 memset(pad, 0, bth_pad(&ack_pkt)); 713 icrc = rxe_crc32(rxe, icrc, pad, bth_pad(&ack_pkt)); 714 } 715 p = payload_addr(&ack_pkt) + payload + bth_pad(&ack_pkt); 716 *p = ~icrc; 717 718 err = rxe_xmit_packet(qp, &ack_pkt, skb); 719 if (err) { 720 pr_err("Failed sending RDMA reply.\n"); 721 return RESPST_ERR_RNR; 722 } 723 724 res->read.va += payload; 725 res->read.resid -= payload; 726 res->cur_psn = (res->cur_psn + 1) & BTH_PSN_MASK; 727 728 if (res->read.resid > 0) { 729 state = RESPST_DONE; 730 } else { 731 qp->resp.res = NULL; 732 if (!res->replay) 733 qp->resp.opcode = -1; 734 if (psn_compare(res->cur_psn, qp->resp.psn) >= 0) 735 qp->resp.psn = res->cur_psn; 736 state = RESPST_CLEANUP; 737 } 738 739 return state; 740 } 741 742 static void build_rdma_network_hdr(union rdma_network_hdr *hdr, 743 struct rxe_pkt_info *pkt) 744 { 745 struct sk_buff *skb = PKT_TO_SKB(pkt); 746 747 memset(hdr, 0, sizeof(*hdr)); 748 if (skb->protocol == htons(ETH_P_IP)) 749 memcpy(&hdr->roce4grh, ip_hdr(skb), sizeof(hdr->roce4grh)); 750 else if (skb->protocol == htons(ETH_P_IPV6)) 751 memcpy(&hdr->ibgrh, ipv6_hdr(skb), sizeof(hdr->ibgrh)); 752 } 753 754 /* Executes a new request. A retried request never reach that function (send 755 * and writes are discarded, and reads and atomics are retried elsewhere. 756 */ 757 static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt) 758 { 759 enum resp_states err; 760 761 if (pkt->mask & RXE_SEND_MASK) { 762 if (qp_type(qp) == IB_QPT_UD || 763 qp_type(qp) == IB_QPT_SMI || 764 qp_type(qp) == IB_QPT_GSI) { 765 union rdma_network_hdr hdr; 766 767 build_rdma_network_hdr(&hdr, pkt); 768 769 err = send_data_in(qp, &hdr, sizeof(hdr)); 770 if (err) 771 return err; 772 } 773 err = send_data_in(qp, payload_addr(pkt), payload_size(pkt)); 774 if (err) 775 return err; 776 } else if (pkt->mask & RXE_WRITE_MASK) { 777 err = write_data_in(qp, pkt); 778 if (err) 779 return err; 780 } else if (pkt->mask & RXE_READ_MASK) { 781 /* For RDMA Read we can increment the msn now. See C9-148. */ 782 qp->resp.msn++; 783 return RESPST_READ_REPLY; 784 } else if (pkt->mask & RXE_ATOMIC_MASK) { 785 err = process_atomic(qp, pkt); 786 if (err) 787 return err; 788 } else { 789 /* Unreachable */ 790 WARN_ON_ONCE(1); 791 } 792 793 /* next expected psn, read handles this separately */ 794 qp->resp.psn = (pkt->psn + 1) & BTH_PSN_MASK; 795 qp->resp.ack_psn = qp->resp.psn; 796 797 qp->resp.opcode = pkt->opcode; 798 qp->resp.status = IB_WC_SUCCESS; 799 800 if (pkt->mask & RXE_COMP_MASK) { 801 /* We successfully processed this new request. */ 802 qp->resp.msn++; 803 return RESPST_COMPLETE; 804 } else if (qp_type(qp) == IB_QPT_RC) 805 return RESPST_ACKNOWLEDGE; 806 else 807 return RESPST_CLEANUP; 808 } 809 810 static enum resp_states do_complete(struct rxe_qp *qp, 811 struct rxe_pkt_info *pkt) 812 { 813 struct rxe_cqe cqe; 814 struct ib_wc *wc = &cqe.ibwc; 815 struct ib_uverbs_wc *uwc = &cqe.uibwc; 816 struct rxe_recv_wqe *wqe = qp->resp.wqe; 817 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 818 819 if (unlikely(!wqe)) 820 return RESPST_CLEANUP; 821 822 memset(&cqe, 0, sizeof(cqe)); 823 824 if (qp->rcq->is_user) { 825 uwc->status = qp->resp.status; 826 uwc->qp_num = qp->ibqp.qp_num; 827 uwc->wr_id = wqe->wr_id; 828 } else { 829 wc->status = qp->resp.status; 830 wc->qp = &qp->ibqp; 831 wc->wr_id = wqe->wr_id; 832 } 833 834 if (wc->status == IB_WC_SUCCESS) { 835 rxe_counter_inc(rxe, RXE_CNT_RDMA_RECV); 836 wc->opcode = (pkt->mask & RXE_IMMDT_MASK && 837 pkt->mask & RXE_WRITE_MASK) ? 838 IB_WC_RECV_RDMA_WITH_IMM : IB_WC_RECV; 839 wc->vendor_err = 0; 840 wc->byte_len = (pkt->mask & RXE_IMMDT_MASK && 841 pkt->mask & RXE_WRITE_MASK) ? 842 qp->resp.length : wqe->dma.length - wqe->dma.resid; 843 844 /* fields after byte_len are different between kernel and user 845 * space 846 */ 847 if (qp->rcq->is_user) { 848 uwc->wc_flags = IB_WC_GRH; 849 850 if (pkt->mask & RXE_IMMDT_MASK) { 851 uwc->wc_flags |= IB_WC_WITH_IMM; 852 uwc->ex.imm_data = immdt_imm(pkt); 853 } 854 855 if (pkt->mask & RXE_IETH_MASK) { 856 uwc->wc_flags |= IB_WC_WITH_INVALIDATE; 857 uwc->ex.invalidate_rkey = ieth_rkey(pkt); 858 } 859 860 uwc->qp_num = qp->ibqp.qp_num; 861 862 if (pkt->mask & RXE_DETH_MASK) 863 uwc->src_qp = deth_sqp(pkt); 864 865 uwc->port_num = qp->attr.port_num; 866 } else { 867 struct sk_buff *skb = PKT_TO_SKB(pkt); 868 869 wc->wc_flags = IB_WC_GRH | IB_WC_WITH_NETWORK_HDR_TYPE; 870 if (skb->protocol == htons(ETH_P_IP)) 871 wc->network_hdr_type = RDMA_NETWORK_IPV4; 872 else 873 wc->network_hdr_type = RDMA_NETWORK_IPV6; 874 875 if (is_vlan_dev(skb->dev)) { 876 wc->wc_flags |= IB_WC_WITH_VLAN; 877 wc->vlan_id = vlan_dev_vlan_id(skb->dev); 878 } 879 880 if (pkt->mask & RXE_IMMDT_MASK) { 881 wc->wc_flags |= IB_WC_WITH_IMM; 882 wc->ex.imm_data = immdt_imm(pkt); 883 } 884 885 if (pkt->mask & RXE_IETH_MASK) { 886 struct rxe_mem *rmr; 887 888 wc->wc_flags |= IB_WC_WITH_INVALIDATE; 889 wc->ex.invalidate_rkey = ieth_rkey(pkt); 890 891 rmr = rxe_pool_get_index(&rxe->mr_pool, 892 wc->ex.invalidate_rkey >> 8); 893 if (unlikely(!rmr)) { 894 pr_err("Bad rkey %#x invalidation\n", 895 wc->ex.invalidate_rkey); 896 return RESPST_ERROR; 897 } 898 rmr->state = RXE_MEM_STATE_FREE; 899 rxe_drop_ref(rmr); 900 } 901 902 wc->qp = &qp->ibqp; 903 904 if (pkt->mask & RXE_DETH_MASK) 905 wc->src_qp = deth_sqp(pkt); 906 907 wc->port_num = qp->attr.port_num; 908 } 909 } 910 911 /* have copy for srq and reference for !srq */ 912 if (!qp->srq) 913 advance_consumer(qp->rq.queue); 914 915 qp->resp.wqe = NULL; 916 917 if (rxe_cq_post(qp->rcq, &cqe, pkt ? bth_se(pkt) : 1)) 918 return RESPST_ERR_CQ_OVERFLOW; 919 920 if (qp->resp.state == QP_STATE_ERROR) 921 return RESPST_CHK_RESOURCE; 922 923 if (!pkt) 924 return RESPST_DONE; 925 else if (qp_type(qp) == IB_QPT_RC) 926 return RESPST_ACKNOWLEDGE; 927 else 928 return RESPST_CLEANUP; 929 } 930 931 static int send_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt, 932 u8 syndrome, u32 psn) 933 { 934 int err = 0; 935 struct rxe_pkt_info ack_pkt; 936 struct sk_buff *skb; 937 938 skb = prepare_ack_packet(qp, pkt, &ack_pkt, IB_OPCODE_RC_ACKNOWLEDGE, 939 0, psn, syndrome, NULL); 940 if (!skb) { 941 err = -ENOMEM; 942 goto err1; 943 } 944 945 err = rxe_xmit_packet(qp, &ack_pkt, skb); 946 if (err) 947 pr_err_ratelimited("Failed sending ack\n"); 948 949 err1: 950 return err; 951 } 952 953 static int send_atomic_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt, 954 u8 syndrome) 955 { 956 int rc = 0; 957 struct rxe_pkt_info ack_pkt; 958 struct sk_buff *skb; 959 struct resp_res *res; 960 961 skb = prepare_ack_packet(qp, pkt, &ack_pkt, 962 IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE, 0, pkt->psn, 963 syndrome, NULL); 964 if (!skb) { 965 rc = -ENOMEM; 966 goto out; 967 } 968 969 rxe_add_ref(qp); 970 971 res = &qp->resp.resources[qp->resp.res_head]; 972 free_rd_atomic_resource(qp, res); 973 rxe_advance_resp_resource(qp); 974 975 memcpy(SKB_TO_PKT(skb), &ack_pkt, sizeof(ack_pkt)); 976 memset((unsigned char *)SKB_TO_PKT(skb) + sizeof(ack_pkt), 0, 977 sizeof(skb->cb) - sizeof(ack_pkt)); 978 979 skb_get(skb); 980 res->type = RXE_ATOMIC_MASK; 981 res->atomic.skb = skb; 982 res->first_psn = ack_pkt.psn; 983 res->last_psn = ack_pkt.psn; 984 res->cur_psn = ack_pkt.psn; 985 986 rc = rxe_xmit_packet(qp, &ack_pkt, skb); 987 if (rc) { 988 pr_err_ratelimited("Failed sending ack\n"); 989 rxe_drop_ref(qp); 990 } 991 out: 992 return rc; 993 } 994 995 static enum resp_states acknowledge(struct rxe_qp *qp, 996 struct rxe_pkt_info *pkt) 997 { 998 if (qp_type(qp) != IB_QPT_RC) 999 return RESPST_CLEANUP; 1000 1001 if (qp->resp.aeth_syndrome != AETH_ACK_UNLIMITED) 1002 send_ack(qp, pkt, qp->resp.aeth_syndrome, pkt->psn); 1003 else if (pkt->mask & RXE_ATOMIC_MASK) 1004 send_atomic_ack(qp, pkt, AETH_ACK_UNLIMITED); 1005 else if (bth_ack(pkt)) 1006 send_ack(qp, pkt, AETH_ACK_UNLIMITED, pkt->psn); 1007 1008 return RESPST_CLEANUP; 1009 } 1010 1011 static enum resp_states cleanup(struct rxe_qp *qp, 1012 struct rxe_pkt_info *pkt) 1013 { 1014 struct sk_buff *skb; 1015 1016 if (pkt) { 1017 skb = skb_dequeue(&qp->req_pkts); 1018 rxe_drop_ref(qp); 1019 kfree_skb(skb); 1020 } 1021 1022 if (qp->resp.mr) { 1023 rxe_drop_ref(qp->resp.mr); 1024 qp->resp.mr = NULL; 1025 } 1026 1027 return RESPST_DONE; 1028 } 1029 1030 static struct resp_res *find_resource(struct rxe_qp *qp, u32 psn) 1031 { 1032 int i; 1033 1034 for (i = 0; i < qp->attr.max_dest_rd_atomic; i++) { 1035 struct resp_res *res = &qp->resp.resources[i]; 1036 1037 if (res->type == 0) 1038 continue; 1039 1040 if (psn_compare(psn, res->first_psn) >= 0 && 1041 psn_compare(psn, res->last_psn) <= 0) { 1042 return res; 1043 } 1044 } 1045 1046 return NULL; 1047 } 1048 1049 static enum resp_states duplicate_request(struct rxe_qp *qp, 1050 struct rxe_pkt_info *pkt) 1051 { 1052 enum resp_states rc; 1053 u32 prev_psn = (qp->resp.ack_psn - 1) & BTH_PSN_MASK; 1054 1055 if (pkt->mask & RXE_SEND_MASK || 1056 pkt->mask & RXE_WRITE_MASK) { 1057 /* SEND. Ack again and cleanup. C9-105. */ 1058 if (bth_ack(pkt)) 1059 send_ack(qp, pkt, AETH_ACK_UNLIMITED, prev_psn); 1060 rc = RESPST_CLEANUP; 1061 goto out; 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 1181 while ((skb = skb_dequeue(&qp->req_pkts))) { 1182 rxe_drop_ref(qp); 1183 kfree_skb(skb); 1184 } 1185 1186 if (notify) 1187 return; 1188 1189 while (!qp->srq && qp->rq.queue && queue_head(qp->rq.queue)) 1190 advance_consumer(qp->rq.queue); 1191 } 1192 1193 int rxe_responder(void *arg) 1194 { 1195 struct rxe_qp *qp = (struct rxe_qp *)arg; 1196 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 1197 enum resp_states state; 1198 struct rxe_pkt_info *pkt = NULL; 1199 int ret = 0; 1200 1201 rxe_add_ref(qp); 1202 1203 qp->resp.aeth_syndrome = AETH_ACK_UNLIMITED; 1204 1205 if (!qp->valid) { 1206 ret = -EINVAL; 1207 goto done; 1208 } 1209 1210 switch (qp->resp.state) { 1211 case QP_STATE_RESET: 1212 state = RESPST_RESET; 1213 break; 1214 1215 default: 1216 state = RESPST_GET_REQ; 1217 break; 1218 } 1219 1220 while (1) { 1221 pr_debug("qp#%d state = %s\n", qp_num(qp), 1222 resp_state_name[state]); 1223 switch (state) { 1224 case RESPST_GET_REQ: 1225 state = get_req(qp, &pkt); 1226 break; 1227 case RESPST_CHK_PSN: 1228 state = check_psn(qp, pkt); 1229 break; 1230 case RESPST_CHK_OP_SEQ: 1231 state = check_op_seq(qp, pkt); 1232 break; 1233 case RESPST_CHK_OP_VALID: 1234 state = check_op_valid(qp, pkt); 1235 break; 1236 case RESPST_CHK_RESOURCE: 1237 state = check_resource(qp, pkt); 1238 break; 1239 case RESPST_CHK_LENGTH: 1240 state = check_length(qp, pkt); 1241 break; 1242 case RESPST_CHK_RKEY: 1243 state = check_rkey(qp, pkt); 1244 break; 1245 case RESPST_EXECUTE: 1246 state = execute(qp, pkt); 1247 break; 1248 case RESPST_COMPLETE: 1249 state = do_complete(qp, pkt); 1250 break; 1251 case RESPST_READ_REPLY: 1252 state = read_reply(qp, pkt); 1253 break; 1254 case RESPST_ACKNOWLEDGE: 1255 state = acknowledge(qp, pkt); 1256 break; 1257 case RESPST_CLEANUP: 1258 state = cleanup(qp, pkt); 1259 break; 1260 case RESPST_DUPLICATE_REQUEST: 1261 state = duplicate_request(qp, pkt); 1262 break; 1263 case RESPST_ERR_PSN_OUT_OF_SEQ: 1264 /* RC only - Class B. Drop packet. */ 1265 send_ack(qp, pkt, AETH_NAK_PSN_SEQ_ERROR, qp->resp.psn); 1266 state = RESPST_CLEANUP; 1267 break; 1268 1269 case RESPST_ERR_TOO_MANY_RDMA_ATM_REQ: 1270 case RESPST_ERR_MISSING_OPCODE_FIRST: 1271 case RESPST_ERR_MISSING_OPCODE_LAST_C: 1272 case RESPST_ERR_UNSUPPORTED_OPCODE: 1273 case RESPST_ERR_MISALIGNED_ATOMIC: 1274 /* RC Only - Class C. */ 1275 do_class_ac_error(qp, AETH_NAK_INVALID_REQ, 1276 IB_WC_REM_INV_REQ_ERR); 1277 state = RESPST_COMPLETE; 1278 break; 1279 1280 case RESPST_ERR_MISSING_OPCODE_LAST_D1E: 1281 state = do_class_d1e_error(qp); 1282 break; 1283 case RESPST_ERR_RNR: 1284 if (qp_type(qp) == IB_QPT_RC) { 1285 rxe_counter_inc(rxe, RXE_CNT_SND_RNR); 1286 /* RC - class B */ 1287 send_ack(qp, pkt, AETH_RNR_NAK | 1288 (~AETH_TYPE_MASK & 1289 qp->attr.min_rnr_timer), 1290 pkt->psn); 1291 } else { 1292 /* UD/UC - class D */ 1293 qp->resp.drop_msg = 1; 1294 } 1295 state = RESPST_CLEANUP; 1296 break; 1297 1298 case RESPST_ERR_RKEY_VIOLATION: 1299 if (qp_type(qp) == IB_QPT_RC) { 1300 /* Class C */ 1301 do_class_ac_error(qp, AETH_NAK_REM_ACC_ERR, 1302 IB_WC_REM_ACCESS_ERR); 1303 state = RESPST_COMPLETE; 1304 } else { 1305 qp->resp.drop_msg = 1; 1306 if (qp->srq) { 1307 /* UC/SRQ Class D */ 1308 qp->resp.status = IB_WC_REM_ACCESS_ERR; 1309 state = RESPST_COMPLETE; 1310 } else { 1311 /* UC/non-SRQ Class E. */ 1312 state = RESPST_CLEANUP; 1313 } 1314 } 1315 break; 1316 1317 case RESPST_ERR_LENGTH: 1318 if (qp_type(qp) == IB_QPT_RC) { 1319 /* Class C */ 1320 do_class_ac_error(qp, AETH_NAK_INVALID_REQ, 1321 IB_WC_REM_INV_REQ_ERR); 1322 state = RESPST_COMPLETE; 1323 } else if (qp->srq) { 1324 /* UC/UD - class E */ 1325 qp->resp.status = IB_WC_REM_INV_REQ_ERR; 1326 state = RESPST_COMPLETE; 1327 } else { 1328 /* UC/UD - class D */ 1329 qp->resp.drop_msg = 1; 1330 state = RESPST_CLEANUP; 1331 } 1332 break; 1333 1334 case RESPST_ERR_MALFORMED_WQE: 1335 /* All, Class A. */ 1336 do_class_ac_error(qp, AETH_NAK_REM_OP_ERR, 1337 IB_WC_LOC_QP_OP_ERR); 1338 state = RESPST_COMPLETE; 1339 break; 1340 1341 case RESPST_ERR_CQ_OVERFLOW: 1342 /* All - Class G */ 1343 state = RESPST_ERROR; 1344 break; 1345 1346 case RESPST_DONE: 1347 if (qp->resp.goto_error) { 1348 state = RESPST_ERROR; 1349 break; 1350 } 1351 1352 goto done; 1353 1354 case RESPST_EXIT: 1355 if (qp->resp.goto_error) { 1356 state = RESPST_ERROR; 1357 break; 1358 } 1359 1360 goto exit; 1361 1362 case RESPST_RESET: 1363 rxe_drain_req_pkts(qp, false); 1364 qp->resp.wqe = NULL; 1365 goto exit; 1366 1367 case RESPST_ERROR: 1368 qp->resp.goto_error = 0; 1369 pr_warn("qp#%d moved to error state\n", qp_num(qp)); 1370 rxe_qp_error(qp); 1371 goto exit; 1372 1373 default: 1374 WARN_ON_ONCE(1); 1375 } 1376 } 1377 1378 exit: 1379 ret = -EAGAIN; 1380 done: 1381 rxe_drop_ref(qp); 1382 return ret; 1383 } 1384