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 if (qp->is_user) 307 wqe = queue_head(q, QUEUE_TYPE_FROM_USER); 308 else 309 wqe = queue_head(q, QUEUE_TYPE_KERNEL); 310 if (!wqe) { 311 spin_unlock_bh(&srq->rq.consumer_lock); 312 return RESPST_ERR_RNR; 313 } 314 315 /* don't trust user space data */ 316 if (unlikely(wqe->dma.num_sge > srq->rq.max_sge)) { 317 spin_unlock_bh(&srq->rq.consumer_lock); 318 pr_warn("%s: invalid num_sge in SRQ entry\n", __func__); 319 return RESPST_ERR_MALFORMED_WQE; 320 } 321 size = sizeof(*wqe) + wqe->dma.num_sge*sizeof(struct rxe_sge); 322 memcpy(&qp->resp.srq_wqe, wqe, size); 323 324 qp->resp.wqe = &qp->resp.srq_wqe.wqe; 325 if (qp->is_user) { 326 advance_consumer(q, QUEUE_TYPE_FROM_USER); 327 count = queue_count(q, QUEUE_TYPE_FROM_USER); 328 } else { 329 advance_consumer(q, QUEUE_TYPE_KERNEL); 330 count = queue_count(q, QUEUE_TYPE_KERNEL); 331 } 332 333 if (srq->limit && srq->ibsrq.event_handler && (count < srq->limit)) { 334 srq->limit = 0; 335 goto event; 336 } 337 338 spin_unlock_bh(&srq->rq.consumer_lock); 339 return RESPST_CHK_LENGTH; 340 341 event: 342 spin_unlock_bh(&srq->rq.consumer_lock); 343 ev.device = qp->ibqp.device; 344 ev.element.srq = qp->ibqp.srq; 345 ev.event = IB_EVENT_SRQ_LIMIT_REACHED; 346 srq->ibsrq.event_handler(&ev, srq->ibsrq.srq_context); 347 return RESPST_CHK_LENGTH; 348 } 349 350 static enum resp_states check_resource(struct rxe_qp *qp, 351 struct rxe_pkt_info *pkt) 352 { 353 struct rxe_srq *srq = qp->srq; 354 355 if (qp->resp.state == QP_STATE_ERROR) { 356 if (qp->resp.wqe) { 357 qp->resp.status = IB_WC_WR_FLUSH_ERR; 358 return RESPST_COMPLETE; 359 } else if (!srq) { 360 if (qp->is_user) 361 qp->resp.wqe = queue_head(qp->rq.queue, 362 QUEUE_TYPE_FROM_USER); 363 else 364 qp->resp.wqe = queue_head(qp->rq.queue, 365 QUEUE_TYPE_KERNEL); 366 if (qp->resp.wqe) { 367 qp->resp.status = IB_WC_WR_FLUSH_ERR; 368 return RESPST_COMPLETE; 369 } else { 370 return RESPST_EXIT; 371 } 372 } else { 373 return RESPST_EXIT; 374 } 375 } 376 377 if (pkt->mask & RXE_READ_OR_ATOMIC) { 378 /* it is the requesters job to not send 379 * too many read/atomic ops, we just 380 * recycle the responder resource queue 381 */ 382 if (likely(qp->attr.max_dest_rd_atomic > 0)) 383 return RESPST_CHK_LENGTH; 384 else 385 return RESPST_ERR_TOO_MANY_RDMA_ATM_REQ; 386 } 387 388 if (pkt->mask & RXE_RWR_MASK) { 389 if (srq) 390 return get_srq_wqe(qp); 391 392 if (qp->is_user) 393 qp->resp.wqe = queue_head(qp->rq.queue, 394 QUEUE_TYPE_FROM_USER); 395 else 396 qp->resp.wqe = queue_head(qp->rq.queue, 397 QUEUE_TYPE_KERNEL); 398 return (qp->resp.wqe) ? RESPST_CHK_LENGTH : RESPST_ERR_RNR; 399 } 400 401 return RESPST_CHK_LENGTH; 402 } 403 404 static enum resp_states check_length(struct rxe_qp *qp, 405 struct rxe_pkt_info *pkt) 406 { 407 switch (qp_type(qp)) { 408 case IB_QPT_RC: 409 return RESPST_CHK_RKEY; 410 411 case IB_QPT_UC: 412 return RESPST_CHK_RKEY; 413 414 default: 415 return RESPST_CHK_RKEY; 416 } 417 } 418 419 static enum resp_states check_rkey(struct rxe_qp *qp, 420 struct rxe_pkt_info *pkt) 421 { 422 struct rxe_mr *mr = NULL; 423 struct rxe_mw *mw = NULL; 424 u64 va; 425 u32 rkey; 426 u32 resid; 427 u32 pktlen; 428 int mtu = qp->mtu; 429 enum resp_states state; 430 int access; 431 432 if (pkt->mask & (RXE_READ_MASK | RXE_WRITE_MASK)) { 433 if (pkt->mask & RXE_RETH_MASK) { 434 qp->resp.va = reth_va(pkt); 435 qp->resp.offset = 0; 436 qp->resp.rkey = reth_rkey(pkt); 437 qp->resp.resid = reth_len(pkt); 438 qp->resp.length = reth_len(pkt); 439 } 440 access = (pkt->mask & RXE_READ_MASK) ? IB_ACCESS_REMOTE_READ 441 : IB_ACCESS_REMOTE_WRITE; 442 } else if (pkt->mask & RXE_ATOMIC_MASK) { 443 qp->resp.va = atmeth_va(pkt); 444 qp->resp.offset = 0; 445 qp->resp.rkey = atmeth_rkey(pkt); 446 qp->resp.resid = sizeof(u64); 447 access = IB_ACCESS_REMOTE_ATOMIC; 448 } else { 449 return RESPST_EXECUTE; 450 } 451 452 /* A zero-byte op is not required to set an addr or rkey. */ 453 if ((pkt->mask & (RXE_READ_MASK | RXE_WRITE_OR_SEND)) && 454 (pkt->mask & RXE_RETH_MASK) && 455 reth_len(pkt) == 0) { 456 return RESPST_EXECUTE; 457 } 458 459 va = qp->resp.va; 460 rkey = qp->resp.rkey; 461 resid = qp->resp.resid; 462 pktlen = payload_size(pkt); 463 464 if (rkey_is_mw(rkey)) { 465 mw = rxe_lookup_mw(qp, access, rkey); 466 if (!mw) { 467 pr_err("%s: no MW matches rkey %#x\n", __func__, rkey); 468 state = RESPST_ERR_RKEY_VIOLATION; 469 goto err; 470 } 471 472 mr = mw->mr; 473 if (!mr) { 474 pr_err("%s: MW doesn't have an MR\n", __func__); 475 state = RESPST_ERR_RKEY_VIOLATION; 476 goto err; 477 } 478 479 if (mw->access & IB_ZERO_BASED) 480 qp->resp.offset = mw->addr; 481 482 rxe_drop_ref(mw); 483 rxe_add_ref(mr); 484 } else { 485 mr = lookup_mr(qp->pd, access, rkey, RXE_LOOKUP_REMOTE); 486 if (!mr) { 487 pr_err("%s: no MR matches rkey %#x\n", __func__, rkey); 488 state = RESPST_ERR_RKEY_VIOLATION; 489 goto err; 490 } 491 } 492 493 if (mr_check_range(mr, va + qp->resp.offset, resid)) { 494 state = RESPST_ERR_RKEY_VIOLATION; 495 goto err; 496 } 497 498 if (pkt->mask & RXE_WRITE_MASK) { 499 if (resid > mtu) { 500 if (pktlen != mtu || bth_pad(pkt)) { 501 state = RESPST_ERR_LENGTH; 502 goto err; 503 } 504 } else { 505 if (pktlen != resid) { 506 state = RESPST_ERR_LENGTH; 507 goto err; 508 } 509 if ((bth_pad(pkt) != (0x3 & (-resid)))) { 510 /* This case may not be exactly that 511 * but nothing else fits. 512 */ 513 state = RESPST_ERR_LENGTH; 514 goto err; 515 } 516 } 517 } 518 519 WARN_ON_ONCE(qp->resp.mr); 520 521 qp->resp.mr = mr; 522 return RESPST_EXECUTE; 523 524 err: 525 if (mr) 526 rxe_drop_ref(mr); 527 if (mw) 528 rxe_drop_ref(mw); 529 530 return state; 531 } 532 533 static enum resp_states send_data_in(struct rxe_qp *qp, void *data_addr, 534 int data_len) 535 { 536 int err; 537 538 err = copy_data(qp->pd, IB_ACCESS_LOCAL_WRITE, &qp->resp.wqe->dma, 539 data_addr, data_len, RXE_TO_MR_OBJ); 540 if (unlikely(err)) 541 return (err == -ENOSPC) ? RESPST_ERR_LENGTH 542 : RESPST_ERR_MALFORMED_WQE; 543 544 return RESPST_NONE; 545 } 546 547 static enum resp_states write_data_in(struct rxe_qp *qp, 548 struct rxe_pkt_info *pkt) 549 { 550 enum resp_states rc = RESPST_NONE; 551 int err; 552 int data_len = payload_size(pkt); 553 554 err = rxe_mr_copy(qp->resp.mr, qp->resp.va + qp->resp.offset, 555 payload_addr(pkt), data_len, RXE_TO_MR_OBJ); 556 if (err) { 557 rc = RESPST_ERR_RKEY_VIOLATION; 558 goto out; 559 } 560 561 qp->resp.va += data_len; 562 qp->resp.resid -= data_len; 563 564 out: 565 return rc; 566 } 567 568 /* Guarantee atomicity of atomic operations at the machine level. */ 569 static DEFINE_SPINLOCK(atomic_ops_lock); 570 571 static enum resp_states process_atomic(struct rxe_qp *qp, 572 struct rxe_pkt_info *pkt) 573 { 574 u64 *vaddr; 575 enum resp_states ret; 576 struct rxe_mr *mr = qp->resp.mr; 577 578 if (mr->state != RXE_MR_STATE_VALID) { 579 ret = RESPST_ERR_RKEY_VIOLATION; 580 goto out; 581 } 582 583 vaddr = iova_to_vaddr(mr, qp->resp.va + qp->resp.offset, sizeof(u64)); 584 585 /* check vaddr is 8 bytes aligned. */ 586 if (!vaddr || (uintptr_t)vaddr & 7) { 587 ret = RESPST_ERR_MISALIGNED_ATOMIC; 588 goto out; 589 } 590 591 spin_lock_bh(&atomic_ops_lock); 592 593 qp->resp.atomic_orig = *vaddr; 594 595 if (pkt->opcode == IB_OPCODE_RC_COMPARE_SWAP || 596 pkt->opcode == IB_OPCODE_RD_COMPARE_SWAP) { 597 if (*vaddr == atmeth_comp(pkt)) 598 *vaddr = atmeth_swap_add(pkt); 599 } else { 600 *vaddr += atmeth_swap_add(pkt); 601 } 602 603 spin_unlock_bh(&atomic_ops_lock); 604 605 ret = RESPST_NONE; 606 out: 607 return ret; 608 } 609 610 static struct sk_buff *prepare_ack_packet(struct rxe_qp *qp, 611 struct rxe_pkt_info *pkt, 612 struct rxe_pkt_info *ack, 613 int opcode, 614 int payload, 615 u32 psn, 616 u8 syndrome) 617 { 618 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 619 struct sk_buff *skb; 620 int paylen; 621 int pad; 622 int err; 623 624 /* 625 * allocate packet 626 */ 627 pad = (-payload) & 0x3; 628 paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE; 629 630 skb = rxe_init_packet(rxe, &qp->pri_av, paylen, ack); 631 if (!skb) 632 return NULL; 633 634 ack->qp = qp; 635 ack->opcode = opcode; 636 ack->mask = rxe_opcode[opcode].mask; 637 ack->paylen = paylen; 638 ack->psn = psn; 639 640 bth_init(ack, opcode, 0, 0, pad, IB_DEFAULT_PKEY_FULL, 641 qp->attr.dest_qp_num, 0, psn); 642 643 if (ack->mask & RXE_AETH_MASK) { 644 aeth_set_syn(ack, syndrome); 645 aeth_set_msn(ack, qp->resp.msn); 646 } 647 648 if (ack->mask & RXE_ATMACK_MASK) 649 atmack_set_orig(ack, qp->resp.atomic_orig); 650 651 err = rxe_prepare(ack, skb); 652 if (err) { 653 kfree_skb(skb); 654 return NULL; 655 } 656 657 return skb; 658 } 659 660 /* RDMA read response. If res is not NULL, then we have a current RDMA request 661 * being processed or replayed. 662 */ 663 static enum resp_states read_reply(struct rxe_qp *qp, 664 struct rxe_pkt_info *req_pkt) 665 { 666 struct rxe_pkt_info ack_pkt; 667 struct sk_buff *skb; 668 int mtu = qp->mtu; 669 enum resp_states state; 670 int payload; 671 int opcode; 672 int err; 673 struct resp_res *res = qp->resp.res; 674 675 if (!res) { 676 /* This is the first time we process that request. Get a 677 * resource 678 */ 679 res = &qp->resp.resources[qp->resp.res_head]; 680 681 free_rd_atomic_resource(qp, res); 682 rxe_advance_resp_resource(qp); 683 684 res->type = RXE_READ_MASK; 685 res->replay = 0; 686 687 res->read.va = qp->resp.va + 688 qp->resp.offset; 689 res->read.va_org = qp->resp.va + 690 qp->resp.offset; 691 692 res->first_psn = req_pkt->psn; 693 694 if (reth_len(req_pkt)) { 695 res->last_psn = (req_pkt->psn + 696 (reth_len(req_pkt) + mtu - 1) / 697 mtu - 1) & BTH_PSN_MASK; 698 } else { 699 res->last_psn = res->first_psn; 700 } 701 res->cur_psn = req_pkt->psn; 702 703 res->read.resid = qp->resp.resid; 704 res->read.length = qp->resp.resid; 705 res->read.rkey = qp->resp.rkey; 706 707 /* note res inherits the reference to mr from qp */ 708 res->read.mr = qp->resp.mr; 709 qp->resp.mr = NULL; 710 711 qp->resp.res = res; 712 res->state = rdatm_res_state_new; 713 } 714 715 if (res->state == rdatm_res_state_new) { 716 if (res->read.resid <= mtu) 717 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_ONLY; 718 else 719 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST; 720 } else { 721 if (res->read.resid > mtu) 722 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE; 723 else 724 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_LAST; 725 } 726 727 res->state = rdatm_res_state_next; 728 729 payload = min_t(int, res->read.resid, mtu); 730 731 skb = prepare_ack_packet(qp, req_pkt, &ack_pkt, opcode, payload, 732 res->cur_psn, AETH_ACK_UNLIMITED); 733 if (!skb) 734 return RESPST_ERR_RNR; 735 736 err = rxe_mr_copy(res->read.mr, res->read.va, payload_addr(&ack_pkt), 737 payload, RXE_FROM_MR_OBJ); 738 if (err) 739 pr_err("Failed copying memory\n"); 740 741 if (bth_pad(&ack_pkt)) { 742 u8 *pad = payload_addr(&ack_pkt) + payload; 743 744 memset(pad, 0, bth_pad(&ack_pkt)); 745 } 746 747 err = rxe_xmit_packet(qp, &ack_pkt, skb); 748 if (err) { 749 pr_err("Failed sending RDMA reply.\n"); 750 return RESPST_ERR_RNR; 751 } 752 753 res->read.va += payload; 754 res->read.resid -= payload; 755 res->cur_psn = (res->cur_psn + 1) & BTH_PSN_MASK; 756 757 if (res->read.resid > 0) { 758 state = RESPST_DONE; 759 } else { 760 qp->resp.res = NULL; 761 if (!res->replay) 762 qp->resp.opcode = -1; 763 if (psn_compare(res->cur_psn, qp->resp.psn) >= 0) 764 qp->resp.psn = res->cur_psn; 765 state = RESPST_CLEANUP; 766 } 767 768 return state; 769 } 770 771 static int invalidate_rkey(struct rxe_qp *qp, u32 rkey) 772 { 773 if (rkey_is_mw(rkey)) 774 return rxe_invalidate_mw(qp, rkey); 775 else 776 return rxe_invalidate_mr(qp, rkey); 777 } 778 779 /* Executes a new request. A retried request never reach that function (send 780 * and writes are discarded, and reads and atomics are retried elsewhere. 781 */ 782 static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt) 783 { 784 enum resp_states err; 785 struct sk_buff *skb = PKT_TO_SKB(pkt); 786 union rdma_network_hdr hdr; 787 788 if (pkt->mask & RXE_SEND_MASK) { 789 if (qp_type(qp) == IB_QPT_UD || 790 qp_type(qp) == IB_QPT_SMI || 791 qp_type(qp) == IB_QPT_GSI) { 792 if (skb->protocol == htons(ETH_P_IP)) { 793 memset(&hdr.reserved, 0, 794 sizeof(hdr.reserved)); 795 memcpy(&hdr.roce4grh, ip_hdr(skb), 796 sizeof(hdr.roce4grh)); 797 err = send_data_in(qp, &hdr, sizeof(hdr)); 798 } else { 799 err = send_data_in(qp, ipv6_hdr(skb), 800 sizeof(hdr)); 801 } 802 if (err) 803 return err; 804 } 805 err = send_data_in(qp, payload_addr(pkt), payload_size(pkt)); 806 if (err) 807 return err; 808 } else if (pkt->mask & RXE_WRITE_MASK) { 809 err = write_data_in(qp, pkt); 810 if (err) 811 return err; 812 } else if (pkt->mask & RXE_READ_MASK) { 813 /* For RDMA Read we can increment the msn now. See C9-148. */ 814 qp->resp.msn++; 815 return RESPST_READ_REPLY; 816 } else if (pkt->mask & RXE_ATOMIC_MASK) { 817 err = process_atomic(qp, pkt); 818 if (err) 819 return err; 820 } else { 821 /* Unreachable */ 822 WARN_ON_ONCE(1); 823 } 824 825 if (pkt->mask & RXE_IETH_MASK) { 826 u32 rkey = ieth_rkey(pkt); 827 828 err = invalidate_rkey(qp, rkey); 829 if (err) 830 return RESPST_ERR_INVALIDATE_RKEY; 831 } 832 833 /* next expected psn, read handles this separately */ 834 qp->resp.psn = (pkt->psn + 1) & BTH_PSN_MASK; 835 qp->resp.ack_psn = qp->resp.psn; 836 837 qp->resp.opcode = pkt->opcode; 838 qp->resp.status = IB_WC_SUCCESS; 839 840 if (pkt->mask & RXE_COMP_MASK) { 841 /* We successfully processed this new request. */ 842 qp->resp.msn++; 843 return RESPST_COMPLETE; 844 } else if (qp_type(qp) == IB_QPT_RC) 845 return RESPST_ACKNOWLEDGE; 846 else 847 return RESPST_CLEANUP; 848 } 849 850 static enum resp_states do_complete(struct rxe_qp *qp, 851 struct rxe_pkt_info *pkt) 852 { 853 struct rxe_cqe cqe; 854 struct ib_wc *wc = &cqe.ibwc; 855 struct ib_uverbs_wc *uwc = &cqe.uibwc; 856 struct rxe_recv_wqe *wqe = qp->resp.wqe; 857 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 858 859 if (!wqe) 860 goto finish; 861 862 memset(&cqe, 0, sizeof(cqe)); 863 864 if (qp->rcq->is_user) { 865 uwc->status = qp->resp.status; 866 uwc->qp_num = qp->ibqp.qp_num; 867 uwc->wr_id = wqe->wr_id; 868 } else { 869 wc->status = qp->resp.status; 870 wc->qp = &qp->ibqp; 871 wc->wr_id = wqe->wr_id; 872 } 873 874 if (wc->status == IB_WC_SUCCESS) { 875 rxe_counter_inc(rxe, RXE_CNT_RDMA_RECV); 876 wc->opcode = (pkt->mask & RXE_IMMDT_MASK && 877 pkt->mask & RXE_WRITE_MASK) ? 878 IB_WC_RECV_RDMA_WITH_IMM : IB_WC_RECV; 879 wc->vendor_err = 0; 880 wc->byte_len = (pkt->mask & RXE_IMMDT_MASK && 881 pkt->mask & RXE_WRITE_MASK) ? 882 qp->resp.length : wqe->dma.length - wqe->dma.resid; 883 884 /* fields after byte_len are different between kernel and user 885 * space 886 */ 887 if (qp->rcq->is_user) { 888 uwc->wc_flags = IB_WC_GRH; 889 890 if (pkt->mask & RXE_IMMDT_MASK) { 891 uwc->wc_flags |= IB_WC_WITH_IMM; 892 uwc->ex.imm_data = immdt_imm(pkt); 893 } 894 895 if (pkt->mask & RXE_IETH_MASK) { 896 uwc->wc_flags |= IB_WC_WITH_INVALIDATE; 897 uwc->ex.invalidate_rkey = ieth_rkey(pkt); 898 } 899 900 uwc->qp_num = qp->ibqp.qp_num; 901 902 if (pkt->mask & RXE_DETH_MASK) 903 uwc->src_qp = deth_sqp(pkt); 904 905 uwc->port_num = qp->attr.port_num; 906 } else { 907 struct sk_buff *skb = PKT_TO_SKB(pkt); 908 909 wc->wc_flags = IB_WC_GRH | IB_WC_WITH_NETWORK_HDR_TYPE; 910 if (skb->protocol == htons(ETH_P_IP)) 911 wc->network_hdr_type = RDMA_NETWORK_IPV4; 912 else 913 wc->network_hdr_type = RDMA_NETWORK_IPV6; 914 915 if (is_vlan_dev(skb->dev)) { 916 wc->wc_flags |= IB_WC_WITH_VLAN; 917 wc->vlan_id = vlan_dev_vlan_id(skb->dev); 918 } 919 920 if (pkt->mask & RXE_IMMDT_MASK) { 921 wc->wc_flags |= IB_WC_WITH_IMM; 922 wc->ex.imm_data = immdt_imm(pkt); 923 } 924 925 if (pkt->mask & RXE_IETH_MASK) { 926 wc->wc_flags |= IB_WC_WITH_INVALIDATE; 927 wc->ex.invalidate_rkey = ieth_rkey(pkt); 928 } 929 930 if (pkt->mask & RXE_DETH_MASK) 931 wc->src_qp = deth_sqp(pkt); 932 933 wc->qp = &qp->ibqp; 934 wc->port_num = qp->attr.port_num; 935 } 936 } 937 938 /* have copy for srq and reference for !srq */ 939 if (!qp->srq) { 940 if (qp->is_user) 941 advance_consumer(qp->rq.queue, QUEUE_TYPE_FROM_USER); 942 else 943 advance_consumer(qp->rq.queue, QUEUE_TYPE_KERNEL); 944 } 945 946 qp->resp.wqe = NULL; 947 948 if (rxe_cq_post(qp->rcq, &cqe, pkt ? bth_se(pkt) : 1)) 949 return RESPST_ERR_CQ_OVERFLOW; 950 951 finish: 952 if (unlikely(qp->resp.state == QP_STATE_ERROR)) 953 return RESPST_CHK_RESOURCE; 954 if (unlikely(!pkt)) 955 return RESPST_DONE; 956 if (qp_type(qp) == IB_QPT_RC) 957 return RESPST_ACKNOWLEDGE; 958 else 959 return RESPST_CLEANUP; 960 } 961 962 static int send_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt, 963 u8 syndrome, u32 psn) 964 { 965 int err = 0; 966 struct rxe_pkt_info ack_pkt; 967 struct sk_buff *skb; 968 969 skb = prepare_ack_packet(qp, pkt, &ack_pkt, IB_OPCODE_RC_ACKNOWLEDGE, 970 0, psn, syndrome); 971 if (!skb) { 972 err = -ENOMEM; 973 goto err1; 974 } 975 976 err = rxe_xmit_packet(qp, &ack_pkt, skb); 977 if (err) 978 pr_err_ratelimited("Failed sending ack\n"); 979 980 err1: 981 return err; 982 } 983 984 static int send_atomic_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt, 985 u8 syndrome) 986 { 987 int rc = 0; 988 struct rxe_pkt_info ack_pkt; 989 struct sk_buff *skb; 990 struct resp_res *res; 991 992 skb = prepare_ack_packet(qp, pkt, &ack_pkt, 993 IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE, 0, pkt->psn, 994 syndrome); 995 if (!skb) { 996 rc = -ENOMEM; 997 goto out; 998 } 999 1000 res = &qp->resp.resources[qp->resp.res_head]; 1001 free_rd_atomic_resource(qp, res); 1002 rxe_advance_resp_resource(qp); 1003 1004 skb_get(skb); 1005 res->type = RXE_ATOMIC_MASK; 1006 res->atomic.skb = skb; 1007 res->first_psn = ack_pkt.psn; 1008 res->last_psn = ack_pkt.psn; 1009 res->cur_psn = ack_pkt.psn; 1010 1011 rc = rxe_xmit_packet(qp, &ack_pkt, skb); 1012 if (rc) { 1013 pr_err_ratelimited("Failed sending ack\n"); 1014 rxe_drop_ref(qp); 1015 } 1016 out: 1017 return rc; 1018 } 1019 1020 static enum resp_states acknowledge(struct rxe_qp *qp, 1021 struct rxe_pkt_info *pkt) 1022 { 1023 if (qp_type(qp) != IB_QPT_RC) 1024 return RESPST_CLEANUP; 1025 1026 if (qp->resp.aeth_syndrome != AETH_ACK_UNLIMITED) 1027 send_ack(qp, pkt, qp->resp.aeth_syndrome, pkt->psn); 1028 else if (pkt->mask & RXE_ATOMIC_MASK) 1029 send_atomic_ack(qp, pkt, AETH_ACK_UNLIMITED); 1030 else if (bth_ack(pkt)) 1031 send_ack(qp, pkt, AETH_ACK_UNLIMITED, pkt->psn); 1032 1033 return RESPST_CLEANUP; 1034 } 1035 1036 static enum resp_states cleanup(struct rxe_qp *qp, 1037 struct rxe_pkt_info *pkt) 1038 { 1039 struct sk_buff *skb; 1040 1041 if (pkt) { 1042 skb = skb_dequeue(&qp->req_pkts); 1043 rxe_drop_ref(qp); 1044 kfree_skb(skb); 1045 ib_device_put(qp->ibqp.device); 1046 } 1047 1048 if (qp->resp.mr) { 1049 rxe_drop_ref(qp->resp.mr); 1050 qp->resp.mr = NULL; 1051 } 1052 1053 return RESPST_DONE; 1054 } 1055 1056 static struct resp_res *find_resource(struct rxe_qp *qp, u32 psn) 1057 { 1058 int i; 1059 1060 for (i = 0; i < qp->attr.max_dest_rd_atomic; i++) { 1061 struct resp_res *res = &qp->resp.resources[i]; 1062 1063 if (res->type == 0) 1064 continue; 1065 1066 if (psn_compare(psn, res->first_psn) >= 0 && 1067 psn_compare(psn, res->last_psn) <= 0) { 1068 return res; 1069 } 1070 } 1071 1072 return NULL; 1073 } 1074 1075 static enum resp_states duplicate_request(struct rxe_qp *qp, 1076 struct rxe_pkt_info *pkt) 1077 { 1078 enum resp_states rc; 1079 u32 prev_psn = (qp->resp.ack_psn - 1) & BTH_PSN_MASK; 1080 1081 if (pkt->mask & RXE_SEND_MASK || 1082 pkt->mask & RXE_WRITE_MASK) { 1083 /* SEND. Ack again and cleanup. C9-105. */ 1084 send_ack(qp, pkt, AETH_ACK_UNLIMITED, prev_psn); 1085 return RESPST_CLEANUP; 1086 } else if (pkt->mask & RXE_READ_MASK) { 1087 struct resp_res *res; 1088 1089 res = find_resource(qp, pkt->psn); 1090 if (!res) { 1091 /* Resource not found. Class D error. Drop the 1092 * request. 1093 */ 1094 rc = RESPST_CLEANUP; 1095 goto out; 1096 } else { 1097 /* Ensure this new request is the same as the previous 1098 * one or a subset of it. 1099 */ 1100 u64 iova = reth_va(pkt); 1101 u32 resid = reth_len(pkt); 1102 1103 if (iova < res->read.va_org || 1104 resid > res->read.length || 1105 (iova + resid) > (res->read.va_org + 1106 res->read.length)) { 1107 rc = RESPST_CLEANUP; 1108 goto out; 1109 } 1110 1111 if (reth_rkey(pkt) != res->read.rkey) { 1112 rc = RESPST_CLEANUP; 1113 goto out; 1114 } 1115 1116 res->cur_psn = pkt->psn; 1117 res->state = (pkt->psn == res->first_psn) ? 1118 rdatm_res_state_new : 1119 rdatm_res_state_replay; 1120 res->replay = 1; 1121 1122 /* Reset the resource, except length. */ 1123 res->read.va_org = iova; 1124 res->read.va = iova; 1125 res->read.resid = resid; 1126 1127 /* Replay the RDMA read reply. */ 1128 qp->resp.res = res; 1129 rc = RESPST_READ_REPLY; 1130 goto out; 1131 } 1132 } else { 1133 struct resp_res *res; 1134 1135 /* Find the operation in our list of responder resources. */ 1136 res = find_resource(qp, pkt->psn); 1137 if (res) { 1138 skb_get(res->atomic.skb); 1139 /* Resend the result. */ 1140 rc = rxe_xmit_packet(qp, pkt, res->atomic.skb); 1141 if (rc) { 1142 pr_err("Failed resending result. This flow is not handled - skb ignored\n"); 1143 rc = RESPST_CLEANUP; 1144 goto out; 1145 } 1146 } 1147 1148 /* Resource not found. Class D error. Drop the request. */ 1149 rc = RESPST_CLEANUP; 1150 goto out; 1151 } 1152 out: 1153 return rc; 1154 } 1155 1156 /* Process a class A or C. Both are treated the same in this implementation. */ 1157 static void do_class_ac_error(struct rxe_qp *qp, u8 syndrome, 1158 enum ib_wc_status status) 1159 { 1160 qp->resp.aeth_syndrome = syndrome; 1161 qp->resp.status = status; 1162 1163 /* indicate that we should go through the ERROR state */ 1164 qp->resp.goto_error = 1; 1165 } 1166 1167 static enum resp_states do_class_d1e_error(struct rxe_qp *qp) 1168 { 1169 /* UC */ 1170 if (qp->srq) { 1171 /* Class E */ 1172 qp->resp.drop_msg = 1; 1173 if (qp->resp.wqe) { 1174 qp->resp.status = IB_WC_REM_INV_REQ_ERR; 1175 return RESPST_COMPLETE; 1176 } else { 1177 return RESPST_CLEANUP; 1178 } 1179 } else { 1180 /* Class D1. This packet may be the start of a 1181 * new message and could be valid. The previous 1182 * message is invalid and ignored. reset the 1183 * recv wr to its original state 1184 */ 1185 if (qp->resp.wqe) { 1186 qp->resp.wqe->dma.resid = qp->resp.wqe->dma.length; 1187 qp->resp.wqe->dma.cur_sge = 0; 1188 qp->resp.wqe->dma.sge_offset = 0; 1189 qp->resp.opcode = -1; 1190 } 1191 1192 if (qp->resp.mr) { 1193 rxe_drop_ref(qp->resp.mr); 1194 qp->resp.mr = NULL; 1195 } 1196 1197 return RESPST_CLEANUP; 1198 } 1199 } 1200 1201 static void rxe_drain_req_pkts(struct rxe_qp *qp, bool notify) 1202 { 1203 struct sk_buff *skb; 1204 struct rxe_queue *q = qp->rq.queue; 1205 1206 while ((skb = skb_dequeue(&qp->req_pkts))) { 1207 rxe_drop_ref(qp); 1208 kfree_skb(skb); 1209 ib_device_put(qp->ibqp.device); 1210 } 1211 1212 if (notify) 1213 return; 1214 1215 while (!qp->srq && q && queue_head(q, q->type)) 1216 advance_consumer(q, q->type); 1217 } 1218 1219 int rxe_responder(void *arg) 1220 { 1221 struct rxe_qp *qp = (struct rxe_qp *)arg; 1222 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 1223 enum resp_states state; 1224 struct rxe_pkt_info *pkt = NULL; 1225 int ret = 0; 1226 1227 rxe_add_ref(qp); 1228 1229 qp->resp.aeth_syndrome = AETH_ACK_UNLIMITED; 1230 1231 if (!qp->valid) { 1232 ret = -EINVAL; 1233 goto done; 1234 } 1235 1236 switch (qp->resp.state) { 1237 case QP_STATE_RESET: 1238 state = RESPST_RESET; 1239 break; 1240 1241 default: 1242 state = RESPST_GET_REQ; 1243 break; 1244 } 1245 1246 while (1) { 1247 pr_debug("qp#%d state = %s\n", qp_num(qp), 1248 resp_state_name[state]); 1249 switch (state) { 1250 case RESPST_GET_REQ: 1251 state = get_req(qp, &pkt); 1252 break; 1253 case RESPST_CHK_PSN: 1254 state = check_psn(qp, pkt); 1255 break; 1256 case RESPST_CHK_OP_SEQ: 1257 state = check_op_seq(qp, pkt); 1258 break; 1259 case RESPST_CHK_OP_VALID: 1260 state = check_op_valid(qp, pkt); 1261 break; 1262 case RESPST_CHK_RESOURCE: 1263 state = check_resource(qp, pkt); 1264 break; 1265 case RESPST_CHK_LENGTH: 1266 state = check_length(qp, pkt); 1267 break; 1268 case RESPST_CHK_RKEY: 1269 state = check_rkey(qp, pkt); 1270 break; 1271 case RESPST_EXECUTE: 1272 state = execute(qp, pkt); 1273 break; 1274 case RESPST_COMPLETE: 1275 state = do_complete(qp, pkt); 1276 break; 1277 case RESPST_READ_REPLY: 1278 state = read_reply(qp, pkt); 1279 break; 1280 case RESPST_ACKNOWLEDGE: 1281 state = acknowledge(qp, pkt); 1282 break; 1283 case RESPST_CLEANUP: 1284 state = cleanup(qp, pkt); 1285 break; 1286 case RESPST_DUPLICATE_REQUEST: 1287 state = duplicate_request(qp, pkt); 1288 break; 1289 case RESPST_ERR_PSN_OUT_OF_SEQ: 1290 /* RC only - Class B. Drop packet. */ 1291 send_ack(qp, pkt, AETH_NAK_PSN_SEQ_ERROR, qp->resp.psn); 1292 state = RESPST_CLEANUP; 1293 break; 1294 1295 case RESPST_ERR_TOO_MANY_RDMA_ATM_REQ: 1296 case RESPST_ERR_MISSING_OPCODE_FIRST: 1297 case RESPST_ERR_MISSING_OPCODE_LAST_C: 1298 case RESPST_ERR_UNSUPPORTED_OPCODE: 1299 case RESPST_ERR_MISALIGNED_ATOMIC: 1300 /* RC Only - Class C. */ 1301 do_class_ac_error(qp, AETH_NAK_INVALID_REQ, 1302 IB_WC_REM_INV_REQ_ERR); 1303 state = RESPST_COMPLETE; 1304 break; 1305 1306 case RESPST_ERR_MISSING_OPCODE_LAST_D1E: 1307 state = do_class_d1e_error(qp); 1308 break; 1309 case RESPST_ERR_RNR: 1310 if (qp_type(qp) == IB_QPT_RC) { 1311 rxe_counter_inc(rxe, RXE_CNT_SND_RNR); 1312 /* RC - class B */ 1313 send_ack(qp, pkt, AETH_RNR_NAK | 1314 (~AETH_TYPE_MASK & 1315 qp->attr.min_rnr_timer), 1316 pkt->psn); 1317 } else { 1318 /* UD/UC - class D */ 1319 qp->resp.drop_msg = 1; 1320 } 1321 state = RESPST_CLEANUP; 1322 break; 1323 1324 case RESPST_ERR_RKEY_VIOLATION: 1325 if (qp_type(qp) == IB_QPT_RC) { 1326 /* Class C */ 1327 do_class_ac_error(qp, AETH_NAK_REM_ACC_ERR, 1328 IB_WC_REM_ACCESS_ERR); 1329 state = RESPST_COMPLETE; 1330 } else { 1331 qp->resp.drop_msg = 1; 1332 if (qp->srq) { 1333 /* UC/SRQ Class D */ 1334 qp->resp.status = IB_WC_REM_ACCESS_ERR; 1335 state = RESPST_COMPLETE; 1336 } else { 1337 /* UC/non-SRQ Class E. */ 1338 state = RESPST_CLEANUP; 1339 } 1340 } 1341 break; 1342 1343 case RESPST_ERR_INVALIDATE_RKEY: 1344 /* RC - Class J. */ 1345 qp->resp.goto_error = 1; 1346 qp->resp.status = IB_WC_REM_INV_REQ_ERR; 1347 state = RESPST_COMPLETE; 1348 break; 1349 1350 case RESPST_ERR_LENGTH: 1351 if (qp_type(qp) == IB_QPT_RC) { 1352 /* Class C */ 1353 do_class_ac_error(qp, AETH_NAK_INVALID_REQ, 1354 IB_WC_REM_INV_REQ_ERR); 1355 state = RESPST_COMPLETE; 1356 } else if (qp->srq) { 1357 /* UC/UD - class E */ 1358 qp->resp.status = IB_WC_REM_INV_REQ_ERR; 1359 state = RESPST_COMPLETE; 1360 } else { 1361 /* UC/UD - class D */ 1362 qp->resp.drop_msg = 1; 1363 state = RESPST_CLEANUP; 1364 } 1365 break; 1366 1367 case RESPST_ERR_MALFORMED_WQE: 1368 /* All, Class A. */ 1369 do_class_ac_error(qp, AETH_NAK_REM_OP_ERR, 1370 IB_WC_LOC_QP_OP_ERR); 1371 state = RESPST_COMPLETE; 1372 break; 1373 1374 case RESPST_ERR_CQ_OVERFLOW: 1375 /* All - Class G */ 1376 state = RESPST_ERROR; 1377 break; 1378 1379 case RESPST_DONE: 1380 if (qp->resp.goto_error) { 1381 state = RESPST_ERROR; 1382 break; 1383 } 1384 1385 goto done; 1386 1387 case RESPST_EXIT: 1388 if (qp->resp.goto_error) { 1389 state = RESPST_ERROR; 1390 break; 1391 } 1392 1393 goto exit; 1394 1395 case RESPST_RESET: 1396 rxe_drain_req_pkts(qp, false); 1397 qp->resp.wqe = NULL; 1398 goto exit; 1399 1400 case RESPST_ERROR: 1401 qp->resp.goto_error = 0; 1402 pr_warn("qp#%d moved to error state\n", qp_num(qp)); 1403 rxe_qp_error(qp); 1404 goto exit; 1405 1406 default: 1407 WARN_ON_ONCE(1); 1408 } 1409 } 1410 1411 exit: 1412 ret = -EAGAIN; 1413 done: 1414 rxe_drop_ref(qp); 1415 return ret; 1416 } 1417