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, NULL); 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, NULL); 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 u32 *crcp) 618 { 619 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 620 struct sk_buff *skb; 621 u32 crc = 0; 622 u32 *p; 623 int paylen; 624 int pad; 625 int err; 626 627 /* 628 * allocate packet 629 */ 630 pad = (-payload) & 0x3; 631 paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE; 632 633 skb = rxe_init_packet(rxe, &qp->pri_av, paylen, ack); 634 if (!skb) 635 return NULL; 636 637 ack->qp = qp; 638 ack->opcode = opcode; 639 ack->mask = rxe_opcode[opcode].mask; 640 ack->paylen = paylen; 641 ack->psn = psn; 642 643 bth_init(ack, opcode, 0, 0, pad, IB_DEFAULT_PKEY_FULL, 644 qp->attr.dest_qp_num, 0, psn); 645 646 if (ack->mask & RXE_AETH_MASK) { 647 aeth_set_syn(ack, syndrome); 648 aeth_set_msn(ack, qp->resp.msn); 649 } 650 651 if (ack->mask & RXE_ATMACK_MASK) 652 atmack_set_orig(ack, qp->resp.atomic_orig); 653 654 err = rxe_prepare(ack, skb, &crc); 655 if (err) { 656 kfree_skb(skb); 657 return NULL; 658 } 659 660 if (crcp) { 661 /* CRC computation will be continued by the caller */ 662 *crcp = crc; 663 } else { 664 p = payload_addr(ack) + payload + bth_pad(ack); 665 *p = ~crc; 666 } 667 668 return skb; 669 } 670 671 /* RDMA read response. If res is not NULL, then we have a current RDMA request 672 * being processed or replayed. 673 */ 674 static enum resp_states read_reply(struct rxe_qp *qp, 675 struct rxe_pkt_info *req_pkt) 676 { 677 struct rxe_pkt_info ack_pkt; 678 struct sk_buff *skb; 679 int mtu = qp->mtu; 680 enum resp_states state; 681 int payload; 682 int opcode; 683 int err; 684 struct resp_res *res = qp->resp.res; 685 u32 icrc; 686 u32 *p; 687 688 if (!res) { 689 /* This is the first time we process that request. Get a 690 * resource 691 */ 692 res = &qp->resp.resources[qp->resp.res_head]; 693 694 free_rd_atomic_resource(qp, res); 695 rxe_advance_resp_resource(qp); 696 697 res->type = RXE_READ_MASK; 698 res->replay = 0; 699 700 res->read.va = qp->resp.va + 701 qp->resp.offset; 702 res->read.va_org = qp->resp.va + 703 qp->resp.offset; 704 705 res->first_psn = req_pkt->psn; 706 707 if (reth_len(req_pkt)) { 708 res->last_psn = (req_pkt->psn + 709 (reth_len(req_pkt) + mtu - 1) / 710 mtu - 1) & BTH_PSN_MASK; 711 } else { 712 res->last_psn = res->first_psn; 713 } 714 res->cur_psn = req_pkt->psn; 715 716 res->read.resid = qp->resp.resid; 717 res->read.length = qp->resp.resid; 718 res->read.rkey = qp->resp.rkey; 719 720 /* note res inherits the reference to mr from qp */ 721 res->read.mr = qp->resp.mr; 722 qp->resp.mr = NULL; 723 724 qp->resp.res = res; 725 res->state = rdatm_res_state_new; 726 } 727 728 if (res->state == rdatm_res_state_new) { 729 if (res->read.resid <= mtu) 730 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_ONLY; 731 else 732 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST; 733 } else { 734 if (res->read.resid > mtu) 735 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE; 736 else 737 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_LAST; 738 } 739 740 res->state = rdatm_res_state_next; 741 742 payload = min_t(int, res->read.resid, mtu); 743 744 skb = prepare_ack_packet(qp, req_pkt, &ack_pkt, opcode, payload, 745 res->cur_psn, AETH_ACK_UNLIMITED, &icrc); 746 if (!skb) 747 return RESPST_ERR_RNR; 748 749 err = rxe_mr_copy(res->read.mr, res->read.va, payload_addr(&ack_pkt), 750 payload, RXE_FROM_MR_OBJ, &icrc); 751 if (err) 752 pr_err("Failed copying memory\n"); 753 754 if (bth_pad(&ack_pkt)) { 755 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 756 u8 *pad = payload_addr(&ack_pkt) + payload; 757 758 memset(pad, 0, bth_pad(&ack_pkt)); 759 icrc = rxe_crc32(rxe, icrc, pad, bth_pad(&ack_pkt)); 760 } 761 p = payload_addr(&ack_pkt) + payload + bth_pad(&ack_pkt); 762 *p = ~icrc; 763 764 err = rxe_xmit_packet(qp, &ack_pkt, skb); 765 if (err) { 766 pr_err("Failed sending RDMA reply.\n"); 767 return RESPST_ERR_RNR; 768 } 769 770 res->read.va += payload; 771 res->read.resid -= payload; 772 res->cur_psn = (res->cur_psn + 1) & BTH_PSN_MASK; 773 774 if (res->read.resid > 0) { 775 state = RESPST_DONE; 776 } else { 777 qp->resp.res = NULL; 778 if (!res->replay) 779 qp->resp.opcode = -1; 780 if (psn_compare(res->cur_psn, qp->resp.psn) >= 0) 781 qp->resp.psn = res->cur_psn; 782 state = RESPST_CLEANUP; 783 } 784 785 return state; 786 } 787 788 static int invalidate_rkey(struct rxe_qp *qp, u32 rkey) 789 { 790 if (rkey_is_mw(rkey)) 791 return rxe_invalidate_mw(qp, rkey); 792 else 793 return rxe_invalidate_mr(qp, rkey); 794 } 795 796 /* Executes a new request. A retried request never reach that function (send 797 * and writes are discarded, and reads and atomics are retried elsewhere. 798 */ 799 static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt) 800 { 801 enum resp_states err; 802 struct sk_buff *skb = PKT_TO_SKB(pkt); 803 union rdma_network_hdr hdr; 804 805 if (pkt->mask & RXE_SEND_MASK) { 806 if (qp_type(qp) == IB_QPT_UD || 807 qp_type(qp) == IB_QPT_SMI || 808 qp_type(qp) == IB_QPT_GSI) { 809 if (skb->protocol == htons(ETH_P_IP)) { 810 memset(&hdr.reserved, 0, 811 sizeof(hdr.reserved)); 812 memcpy(&hdr.roce4grh, ip_hdr(skb), 813 sizeof(hdr.roce4grh)); 814 err = send_data_in(qp, &hdr, sizeof(hdr)); 815 } else { 816 err = send_data_in(qp, ipv6_hdr(skb), 817 sizeof(hdr)); 818 } 819 if (err) 820 return err; 821 } 822 err = send_data_in(qp, payload_addr(pkt), payload_size(pkt)); 823 if (err) 824 return err; 825 } else if (pkt->mask & RXE_WRITE_MASK) { 826 err = write_data_in(qp, pkt); 827 if (err) 828 return err; 829 } else if (pkt->mask & RXE_READ_MASK) { 830 /* For RDMA Read we can increment the msn now. See C9-148. */ 831 qp->resp.msn++; 832 return RESPST_READ_REPLY; 833 } else if (pkt->mask & RXE_ATOMIC_MASK) { 834 err = process_atomic(qp, pkt); 835 if (err) 836 return err; 837 } else { 838 /* Unreachable */ 839 WARN_ON_ONCE(1); 840 } 841 842 if (pkt->mask & RXE_IETH_MASK) { 843 u32 rkey = ieth_rkey(pkt); 844 845 err = invalidate_rkey(qp, rkey); 846 if (err) 847 return RESPST_ERR_INVALIDATE_RKEY; 848 } 849 850 /* next expected psn, read handles this separately */ 851 qp->resp.psn = (pkt->psn + 1) & BTH_PSN_MASK; 852 qp->resp.ack_psn = qp->resp.psn; 853 854 qp->resp.opcode = pkt->opcode; 855 qp->resp.status = IB_WC_SUCCESS; 856 857 if (pkt->mask & RXE_COMP_MASK) { 858 /* We successfully processed this new request. */ 859 qp->resp.msn++; 860 return RESPST_COMPLETE; 861 } else if (qp_type(qp) == IB_QPT_RC) 862 return RESPST_ACKNOWLEDGE; 863 else 864 return RESPST_CLEANUP; 865 } 866 867 static enum resp_states do_complete(struct rxe_qp *qp, 868 struct rxe_pkt_info *pkt) 869 { 870 struct rxe_cqe cqe; 871 struct ib_wc *wc = &cqe.ibwc; 872 struct ib_uverbs_wc *uwc = &cqe.uibwc; 873 struct rxe_recv_wqe *wqe = qp->resp.wqe; 874 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 875 876 if (!wqe) 877 goto finish; 878 879 memset(&cqe, 0, sizeof(cqe)); 880 881 if (qp->rcq->is_user) { 882 uwc->status = qp->resp.status; 883 uwc->qp_num = qp->ibqp.qp_num; 884 uwc->wr_id = wqe->wr_id; 885 } else { 886 wc->status = qp->resp.status; 887 wc->qp = &qp->ibqp; 888 wc->wr_id = wqe->wr_id; 889 } 890 891 if (wc->status == IB_WC_SUCCESS) { 892 rxe_counter_inc(rxe, RXE_CNT_RDMA_RECV); 893 wc->opcode = (pkt->mask & RXE_IMMDT_MASK && 894 pkt->mask & RXE_WRITE_MASK) ? 895 IB_WC_RECV_RDMA_WITH_IMM : IB_WC_RECV; 896 wc->vendor_err = 0; 897 wc->byte_len = (pkt->mask & RXE_IMMDT_MASK && 898 pkt->mask & RXE_WRITE_MASK) ? 899 qp->resp.length : wqe->dma.length - wqe->dma.resid; 900 901 /* fields after byte_len are different between kernel and user 902 * space 903 */ 904 if (qp->rcq->is_user) { 905 uwc->wc_flags = IB_WC_GRH; 906 907 if (pkt->mask & RXE_IMMDT_MASK) { 908 uwc->wc_flags |= IB_WC_WITH_IMM; 909 uwc->ex.imm_data = immdt_imm(pkt); 910 } 911 912 if (pkt->mask & RXE_IETH_MASK) { 913 uwc->wc_flags |= IB_WC_WITH_INVALIDATE; 914 uwc->ex.invalidate_rkey = ieth_rkey(pkt); 915 } 916 917 uwc->qp_num = qp->ibqp.qp_num; 918 919 if (pkt->mask & RXE_DETH_MASK) 920 uwc->src_qp = deth_sqp(pkt); 921 922 uwc->port_num = qp->attr.port_num; 923 } else { 924 struct sk_buff *skb = PKT_TO_SKB(pkt); 925 926 wc->wc_flags = IB_WC_GRH | IB_WC_WITH_NETWORK_HDR_TYPE; 927 if (skb->protocol == htons(ETH_P_IP)) 928 wc->network_hdr_type = RDMA_NETWORK_IPV4; 929 else 930 wc->network_hdr_type = RDMA_NETWORK_IPV6; 931 932 if (is_vlan_dev(skb->dev)) { 933 wc->wc_flags |= IB_WC_WITH_VLAN; 934 wc->vlan_id = vlan_dev_vlan_id(skb->dev); 935 } 936 937 if (pkt->mask & RXE_IMMDT_MASK) { 938 wc->wc_flags |= IB_WC_WITH_IMM; 939 wc->ex.imm_data = immdt_imm(pkt); 940 } 941 942 if (pkt->mask & RXE_IETH_MASK) { 943 wc->wc_flags |= IB_WC_WITH_INVALIDATE; 944 wc->ex.invalidate_rkey = ieth_rkey(pkt); 945 } 946 947 if (pkt->mask & RXE_DETH_MASK) 948 wc->src_qp = deth_sqp(pkt); 949 950 wc->qp = &qp->ibqp; 951 wc->port_num = qp->attr.port_num; 952 } 953 } 954 955 /* have copy for srq and reference for !srq */ 956 if (!qp->srq) { 957 if (qp->is_user) 958 advance_consumer(qp->rq.queue, QUEUE_TYPE_FROM_USER); 959 else 960 advance_consumer(qp->rq.queue, QUEUE_TYPE_KERNEL); 961 } 962 963 qp->resp.wqe = NULL; 964 965 if (rxe_cq_post(qp->rcq, &cqe, pkt ? bth_se(pkt) : 1)) 966 return RESPST_ERR_CQ_OVERFLOW; 967 968 finish: 969 if (unlikely(qp->resp.state == QP_STATE_ERROR)) 970 return RESPST_CHK_RESOURCE; 971 if (unlikely(!pkt)) 972 return RESPST_DONE; 973 if (qp_type(qp) == IB_QPT_RC) 974 return RESPST_ACKNOWLEDGE; 975 else 976 return RESPST_CLEANUP; 977 } 978 979 static int send_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt, 980 u8 syndrome, u32 psn) 981 { 982 int err = 0; 983 struct rxe_pkt_info ack_pkt; 984 struct sk_buff *skb; 985 986 skb = prepare_ack_packet(qp, pkt, &ack_pkt, IB_OPCODE_RC_ACKNOWLEDGE, 987 0, psn, syndrome, NULL); 988 if (!skb) { 989 err = -ENOMEM; 990 goto err1; 991 } 992 993 err = rxe_xmit_packet(qp, &ack_pkt, skb); 994 if (err) 995 pr_err_ratelimited("Failed sending ack\n"); 996 997 err1: 998 return err; 999 } 1000 1001 static int send_atomic_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt, 1002 u8 syndrome) 1003 { 1004 int rc = 0; 1005 struct rxe_pkt_info ack_pkt; 1006 struct sk_buff *skb; 1007 struct resp_res *res; 1008 1009 skb = prepare_ack_packet(qp, pkt, &ack_pkt, 1010 IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE, 0, pkt->psn, 1011 syndrome, NULL); 1012 if (!skb) { 1013 rc = -ENOMEM; 1014 goto out; 1015 } 1016 1017 res = &qp->resp.resources[qp->resp.res_head]; 1018 free_rd_atomic_resource(qp, res); 1019 rxe_advance_resp_resource(qp); 1020 1021 skb_get(skb); 1022 res->type = RXE_ATOMIC_MASK; 1023 res->atomic.skb = skb; 1024 res->first_psn = ack_pkt.psn; 1025 res->last_psn = ack_pkt.psn; 1026 res->cur_psn = ack_pkt.psn; 1027 1028 rc = rxe_xmit_packet(qp, &ack_pkt, skb); 1029 if (rc) { 1030 pr_err_ratelimited("Failed sending ack\n"); 1031 rxe_drop_ref(qp); 1032 } 1033 out: 1034 return rc; 1035 } 1036 1037 static enum resp_states acknowledge(struct rxe_qp *qp, 1038 struct rxe_pkt_info *pkt) 1039 { 1040 if (qp_type(qp) != IB_QPT_RC) 1041 return RESPST_CLEANUP; 1042 1043 if (qp->resp.aeth_syndrome != AETH_ACK_UNLIMITED) 1044 send_ack(qp, pkt, qp->resp.aeth_syndrome, pkt->psn); 1045 else if (pkt->mask & RXE_ATOMIC_MASK) 1046 send_atomic_ack(qp, pkt, AETH_ACK_UNLIMITED); 1047 else if (bth_ack(pkt)) 1048 send_ack(qp, pkt, AETH_ACK_UNLIMITED, pkt->psn); 1049 1050 return RESPST_CLEANUP; 1051 } 1052 1053 static enum resp_states cleanup(struct rxe_qp *qp, 1054 struct rxe_pkt_info *pkt) 1055 { 1056 struct sk_buff *skb; 1057 1058 if (pkt) { 1059 skb = skb_dequeue(&qp->req_pkts); 1060 rxe_drop_ref(qp); 1061 kfree_skb(skb); 1062 ib_device_put(qp->ibqp.device); 1063 } 1064 1065 if (qp->resp.mr) { 1066 rxe_drop_ref(qp->resp.mr); 1067 qp->resp.mr = NULL; 1068 } 1069 1070 return RESPST_DONE; 1071 } 1072 1073 static struct resp_res *find_resource(struct rxe_qp *qp, u32 psn) 1074 { 1075 int i; 1076 1077 for (i = 0; i < qp->attr.max_dest_rd_atomic; i++) { 1078 struct resp_res *res = &qp->resp.resources[i]; 1079 1080 if (res->type == 0) 1081 continue; 1082 1083 if (psn_compare(psn, res->first_psn) >= 0 && 1084 psn_compare(psn, res->last_psn) <= 0) { 1085 return res; 1086 } 1087 } 1088 1089 return NULL; 1090 } 1091 1092 static enum resp_states duplicate_request(struct rxe_qp *qp, 1093 struct rxe_pkt_info *pkt) 1094 { 1095 enum resp_states rc; 1096 u32 prev_psn = (qp->resp.ack_psn - 1) & BTH_PSN_MASK; 1097 1098 if (pkt->mask & RXE_SEND_MASK || 1099 pkt->mask & RXE_WRITE_MASK) { 1100 /* SEND. Ack again and cleanup. C9-105. */ 1101 send_ack(qp, pkt, AETH_ACK_UNLIMITED, prev_psn); 1102 return RESPST_CLEANUP; 1103 } else if (pkt->mask & RXE_READ_MASK) { 1104 struct resp_res *res; 1105 1106 res = find_resource(qp, pkt->psn); 1107 if (!res) { 1108 /* Resource not found. Class D error. Drop the 1109 * request. 1110 */ 1111 rc = RESPST_CLEANUP; 1112 goto out; 1113 } else { 1114 /* Ensure this new request is the same as the previous 1115 * one or a subset of it. 1116 */ 1117 u64 iova = reth_va(pkt); 1118 u32 resid = reth_len(pkt); 1119 1120 if (iova < res->read.va_org || 1121 resid > res->read.length || 1122 (iova + resid) > (res->read.va_org + 1123 res->read.length)) { 1124 rc = RESPST_CLEANUP; 1125 goto out; 1126 } 1127 1128 if (reth_rkey(pkt) != res->read.rkey) { 1129 rc = RESPST_CLEANUP; 1130 goto out; 1131 } 1132 1133 res->cur_psn = pkt->psn; 1134 res->state = (pkt->psn == res->first_psn) ? 1135 rdatm_res_state_new : 1136 rdatm_res_state_replay; 1137 res->replay = 1; 1138 1139 /* Reset the resource, except length. */ 1140 res->read.va_org = iova; 1141 res->read.va = iova; 1142 res->read.resid = resid; 1143 1144 /* Replay the RDMA read reply. */ 1145 qp->resp.res = res; 1146 rc = RESPST_READ_REPLY; 1147 goto out; 1148 } 1149 } else { 1150 struct resp_res *res; 1151 1152 /* Find the operation in our list of responder resources. */ 1153 res = find_resource(qp, pkt->psn); 1154 if (res) { 1155 skb_get(res->atomic.skb); 1156 /* Resend the result. */ 1157 rc = rxe_xmit_packet(qp, pkt, res->atomic.skb); 1158 if (rc) { 1159 pr_err("Failed resending result. This flow is not handled - skb ignored\n"); 1160 rc = RESPST_CLEANUP; 1161 goto out; 1162 } 1163 } 1164 1165 /* Resource not found. Class D error. Drop the request. */ 1166 rc = RESPST_CLEANUP; 1167 goto out; 1168 } 1169 out: 1170 return rc; 1171 } 1172 1173 /* Process a class A or C. Both are treated the same in this implementation. */ 1174 static void do_class_ac_error(struct rxe_qp *qp, u8 syndrome, 1175 enum ib_wc_status status) 1176 { 1177 qp->resp.aeth_syndrome = syndrome; 1178 qp->resp.status = status; 1179 1180 /* indicate that we should go through the ERROR state */ 1181 qp->resp.goto_error = 1; 1182 } 1183 1184 static enum resp_states do_class_d1e_error(struct rxe_qp *qp) 1185 { 1186 /* UC */ 1187 if (qp->srq) { 1188 /* Class E */ 1189 qp->resp.drop_msg = 1; 1190 if (qp->resp.wqe) { 1191 qp->resp.status = IB_WC_REM_INV_REQ_ERR; 1192 return RESPST_COMPLETE; 1193 } else { 1194 return RESPST_CLEANUP; 1195 } 1196 } else { 1197 /* Class D1. This packet may be the start of a 1198 * new message and could be valid. The previous 1199 * message is invalid and ignored. reset the 1200 * recv wr to its original state 1201 */ 1202 if (qp->resp.wqe) { 1203 qp->resp.wqe->dma.resid = qp->resp.wqe->dma.length; 1204 qp->resp.wqe->dma.cur_sge = 0; 1205 qp->resp.wqe->dma.sge_offset = 0; 1206 qp->resp.opcode = -1; 1207 } 1208 1209 if (qp->resp.mr) { 1210 rxe_drop_ref(qp->resp.mr); 1211 qp->resp.mr = NULL; 1212 } 1213 1214 return RESPST_CLEANUP; 1215 } 1216 } 1217 1218 static void rxe_drain_req_pkts(struct rxe_qp *qp, bool notify) 1219 { 1220 struct sk_buff *skb; 1221 struct rxe_queue *q = qp->rq.queue; 1222 1223 while ((skb = skb_dequeue(&qp->req_pkts))) { 1224 rxe_drop_ref(qp); 1225 kfree_skb(skb); 1226 ib_device_put(qp->ibqp.device); 1227 } 1228 1229 if (notify) 1230 return; 1231 1232 while (!qp->srq && q && queue_head(q, q->type)) 1233 advance_consumer(q, q->type); 1234 } 1235 1236 int rxe_responder(void *arg) 1237 { 1238 struct rxe_qp *qp = (struct rxe_qp *)arg; 1239 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 1240 enum resp_states state; 1241 struct rxe_pkt_info *pkt = NULL; 1242 int ret = 0; 1243 1244 rxe_add_ref(qp); 1245 1246 qp->resp.aeth_syndrome = AETH_ACK_UNLIMITED; 1247 1248 if (!qp->valid) { 1249 ret = -EINVAL; 1250 goto done; 1251 } 1252 1253 switch (qp->resp.state) { 1254 case QP_STATE_RESET: 1255 state = RESPST_RESET; 1256 break; 1257 1258 default: 1259 state = RESPST_GET_REQ; 1260 break; 1261 } 1262 1263 while (1) { 1264 pr_debug("qp#%d state = %s\n", qp_num(qp), 1265 resp_state_name[state]); 1266 switch (state) { 1267 case RESPST_GET_REQ: 1268 state = get_req(qp, &pkt); 1269 break; 1270 case RESPST_CHK_PSN: 1271 state = check_psn(qp, pkt); 1272 break; 1273 case RESPST_CHK_OP_SEQ: 1274 state = check_op_seq(qp, pkt); 1275 break; 1276 case RESPST_CHK_OP_VALID: 1277 state = check_op_valid(qp, pkt); 1278 break; 1279 case RESPST_CHK_RESOURCE: 1280 state = check_resource(qp, pkt); 1281 break; 1282 case RESPST_CHK_LENGTH: 1283 state = check_length(qp, pkt); 1284 break; 1285 case RESPST_CHK_RKEY: 1286 state = check_rkey(qp, pkt); 1287 break; 1288 case RESPST_EXECUTE: 1289 state = execute(qp, pkt); 1290 break; 1291 case RESPST_COMPLETE: 1292 state = do_complete(qp, pkt); 1293 break; 1294 case RESPST_READ_REPLY: 1295 state = read_reply(qp, pkt); 1296 break; 1297 case RESPST_ACKNOWLEDGE: 1298 state = acknowledge(qp, pkt); 1299 break; 1300 case RESPST_CLEANUP: 1301 state = cleanup(qp, pkt); 1302 break; 1303 case RESPST_DUPLICATE_REQUEST: 1304 state = duplicate_request(qp, pkt); 1305 break; 1306 case RESPST_ERR_PSN_OUT_OF_SEQ: 1307 /* RC only - Class B. Drop packet. */ 1308 send_ack(qp, pkt, AETH_NAK_PSN_SEQ_ERROR, qp->resp.psn); 1309 state = RESPST_CLEANUP; 1310 break; 1311 1312 case RESPST_ERR_TOO_MANY_RDMA_ATM_REQ: 1313 case RESPST_ERR_MISSING_OPCODE_FIRST: 1314 case RESPST_ERR_MISSING_OPCODE_LAST_C: 1315 case RESPST_ERR_UNSUPPORTED_OPCODE: 1316 case RESPST_ERR_MISALIGNED_ATOMIC: 1317 /* RC Only - Class C. */ 1318 do_class_ac_error(qp, AETH_NAK_INVALID_REQ, 1319 IB_WC_REM_INV_REQ_ERR); 1320 state = RESPST_COMPLETE; 1321 break; 1322 1323 case RESPST_ERR_MISSING_OPCODE_LAST_D1E: 1324 state = do_class_d1e_error(qp); 1325 break; 1326 case RESPST_ERR_RNR: 1327 if (qp_type(qp) == IB_QPT_RC) { 1328 rxe_counter_inc(rxe, RXE_CNT_SND_RNR); 1329 /* RC - class B */ 1330 send_ack(qp, pkt, AETH_RNR_NAK | 1331 (~AETH_TYPE_MASK & 1332 qp->attr.min_rnr_timer), 1333 pkt->psn); 1334 } else { 1335 /* UD/UC - class D */ 1336 qp->resp.drop_msg = 1; 1337 } 1338 state = RESPST_CLEANUP; 1339 break; 1340 1341 case RESPST_ERR_RKEY_VIOLATION: 1342 if (qp_type(qp) == IB_QPT_RC) { 1343 /* Class C */ 1344 do_class_ac_error(qp, AETH_NAK_REM_ACC_ERR, 1345 IB_WC_REM_ACCESS_ERR); 1346 state = RESPST_COMPLETE; 1347 } else { 1348 qp->resp.drop_msg = 1; 1349 if (qp->srq) { 1350 /* UC/SRQ Class D */ 1351 qp->resp.status = IB_WC_REM_ACCESS_ERR; 1352 state = RESPST_COMPLETE; 1353 } else { 1354 /* UC/non-SRQ Class E. */ 1355 state = RESPST_CLEANUP; 1356 } 1357 } 1358 break; 1359 1360 case RESPST_ERR_INVALIDATE_RKEY: 1361 /* RC - Class J. */ 1362 qp->resp.goto_error = 1; 1363 qp->resp.status = IB_WC_REM_INV_REQ_ERR; 1364 state = RESPST_COMPLETE; 1365 break; 1366 1367 case RESPST_ERR_LENGTH: 1368 if (qp_type(qp) == IB_QPT_RC) { 1369 /* Class C */ 1370 do_class_ac_error(qp, AETH_NAK_INVALID_REQ, 1371 IB_WC_REM_INV_REQ_ERR); 1372 state = RESPST_COMPLETE; 1373 } else if (qp->srq) { 1374 /* UC/UD - class E */ 1375 qp->resp.status = IB_WC_REM_INV_REQ_ERR; 1376 state = RESPST_COMPLETE; 1377 } else { 1378 /* UC/UD - class D */ 1379 qp->resp.drop_msg = 1; 1380 state = RESPST_CLEANUP; 1381 } 1382 break; 1383 1384 case RESPST_ERR_MALFORMED_WQE: 1385 /* All, Class A. */ 1386 do_class_ac_error(qp, AETH_NAK_REM_OP_ERR, 1387 IB_WC_LOC_QP_OP_ERR); 1388 state = RESPST_COMPLETE; 1389 break; 1390 1391 case RESPST_ERR_CQ_OVERFLOW: 1392 /* All - Class G */ 1393 state = RESPST_ERROR; 1394 break; 1395 1396 case RESPST_DONE: 1397 if (qp->resp.goto_error) { 1398 state = RESPST_ERROR; 1399 break; 1400 } 1401 1402 goto done; 1403 1404 case RESPST_EXIT: 1405 if (qp->resp.goto_error) { 1406 state = RESPST_ERROR; 1407 break; 1408 } 1409 1410 goto exit; 1411 1412 case RESPST_RESET: 1413 rxe_drain_req_pkts(qp, false); 1414 qp->resp.wqe = NULL; 1415 goto exit; 1416 1417 case RESPST_ERROR: 1418 qp->resp.goto_error = 0; 1419 pr_warn("qp#%d moved to error state\n", qp_num(qp)); 1420 rxe_qp_error(qp); 1421 goto exit; 1422 1423 default: 1424 WARN_ON_ONCE(1); 1425 } 1426 } 1427 1428 exit: 1429 ret = -EAGAIN; 1430 done: 1431 rxe_drop_ref(qp); 1432 return ret; 1433 } 1434