1 /* 2 * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved. 3 * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved. 4 * 5 * This software is available to you under a choice of one of two 6 * licenses. You may choose to be licensed under the terms of the GNU 7 * General Public License (GPL) Version 2, available from the file 8 * COPYING in the main directory of this source tree, or the 9 * OpenIB.org BSD license below: 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 15 * - Redistributions of source code must retain the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer. 18 * 19 * - Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials 22 * provided with the distribution. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 31 * SOFTWARE. 32 */ 33 34 #include <linux/skbuff.h> 35 36 #include "rxe.h" 37 #include "rxe_loc.h" 38 #include "rxe_queue.h" 39 40 enum resp_states { 41 RESPST_NONE, 42 RESPST_GET_REQ, 43 RESPST_CHK_PSN, 44 RESPST_CHK_OP_SEQ, 45 RESPST_CHK_OP_VALID, 46 RESPST_CHK_RESOURCE, 47 RESPST_CHK_LENGTH, 48 RESPST_CHK_RKEY, 49 RESPST_EXECUTE, 50 RESPST_READ_REPLY, 51 RESPST_COMPLETE, 52 RESPST_ACKNOWLEDGE, 53 RESPST_CLEANUP, 54 RESPST_DUPLICATE_REQUEST, 55 RESPST_ERR_MALFORMED_WQE, 56 RESPST_ERR_UNSUPPORTED_OPCODE, 57 RESPST_ERR_MISALIGNED_ATOMIC, 58 RESPST_ERR_PSN_OUT_OF_SEQ, 59 RESPST_ERR_MISSING_OPCODE_FIRST, 60 RESPST_ERR_MISSING_OPCODE_LAST_C, 61 RESPST_ERR_MISSING_OPCODE_LAST_D1E, 62 RESPST_ERR_TOO_MANY_RDMA_ATM_REQ, 63 RESPST_ERR_RNR, 64 RESPST_ERR_RKEY_VIOLATION, 65 RESPST_ERR_LENGTH, 66 RESPST_ERR_CQ_OVERFLOW, 67 RESPST_ERROR, 68 RESPST_RESET, 69 RESPST_DONE, 70 RESPST_EXIT, 71 }; 72 73 static char *resp_state_name[] = { 74 [RESPST_NONE] = "NONE", 75 [RESPST_GET_REQ] = "GET_REQ", 76 [RESPST_CHK_PSN] = "CHK_PSN", 77 [RESPST_CHK_OP_SEQ] = "CHK_OP_SEQ", 78 [RESPST_CHK_OP_VALID] = "CHK_OP_VALID", 79 [RESPST_CHK_RESOURCE] = "CHK_RESOURCE", 80 [RESPST_CHK_LENGTH] = "CHK_LENGTH", 81 [RESPST_CHK_RKEY] = "CHK_RKEY", 82 [RESPST_EXECUTE] = "EXECUTE", 83 [RESPST_READ_REPLY] = "READ_REPLY", 84 [RESPST_COMPLETE] = "COMPLETE", 85 [RESPST_ACKNOWLEDGE] = "ACKNOWLEDGE", 86 [RESPST_CLEANUP] = "CLEANUP", 87 [RESPST_DUPLICATE_REQUEST] = "DUPLICATE_REQUEST", 88 [RESPST_ERR_MALFORMED_WQE] = "ERR_MALFORMED_WQE", 89 [RESPST_ERR_UNSUPPORTED_OPCODE] = "ERR_UNSUPPORTED_OPCODE", 90 [RESPST_ERR_MISALIGNED_ATOMIC] = "ERR_MISALIGNED_ATOMIC", 91 [RESPST_ERR_PSN_OUT_OF_SEQ] = "ERR_PSN_OUT_OF_SEQ", 92 [RESPST_ERR_MISSING_OPCODE_FIRST] = "ERR_MISSING_OPCODE_FIRST", 93 [RESPST_ERR_MISSING_OPCODE_LAST_C] = "ERR_MISSING_OPCODE_LAST_C", 94 [RESPST_ERR_MISSING_OPCODE_LAST_D1E] = "ERR_MISSING_OPCODE_LAST_D1E", 95 [RESPST_ERR_TOO_MANY_RDMA_ATM_REQ] = "ERR_TOO_MANY_RDMA_ATM_REQ", 96 [RESPST_ERR_RNR] = "ERR_RNR", 97 [RESPST_ERR_RKEY_VIOLATION] = "ERR_RKEY_VIOLATION", 98 [RESPST_ERR_LENGTH] = "ERR_LENGTH", 99 [RESPST_ERR_CQ_OVERFLOW] = "ERR_CQ_OVERFLOW", 100 [RESPST_ERROR] = "ERROR", 101 [RESPST_RESET] = "RESET", 102 [RESPST_DONE] = "DONE", 103 [RESPST_EXIT] = "EXIT", 104 }; 105 106 /* rxe_recv calls here to add a request packet to the input queue */ 107 void rxe_resp_queue_pkt(struct rxe_qp *qp, struct sk_buff *skb) 108 { 109 int must_sched; 110 struct rxe_pkt_info *pkt = SKB_TO_PKT(skb); 111 112 skb_queue_tail(&qp->req_pkts, skb); 113 114 must_sched = (pkt->opcode == IB_OPCODE_RC_RDMA_READ_REQUEST) || 115 (skb_queue_len(&qp->req_pkts) > 1); 116 117 rxe_run_task(&qp->resp.task, must_sched); 118 } 119 120 static inline enum resp_states get_req(struct rxe_qp *qp, 121 struct rxe_pkt_info **pkt_p) 122 { 123 struct sk_buff *skb; 124 125 if (qp->resp.state == QP_STATE_ERROR) { 126 while ((skb = skb_dequeue(&qp->req_pkts))) { 127 rxe_drop_ref(qp); 128 kfree_skb(skb); 129 } 130 131 /* go drain recv wr queue */ 132 return RESPST_CHK_RESOURCE; 133 } 134 135 skb = skb_peek(&qp->req_pkts); 136 if (!skb) 137 return RESPST_EXIT; 138 139 *pkt_p = SKB_TO_PKT(skb); 140 141 return (qp->resp.res) ? RESPST_READ_REPLY : RESPST_CHK_PSN; 142 } 143 144 static enum resp_states check_psn(struct rxe_qp *qp, 145 struct rxe_pkt_info *pkt) 146 { 147 int diff = psn_compare(pkt->psn, qp->resp.psn); 148 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 149 150 switch (qp_type(qp)) { 151 case IB_QPT_RC: 152 if (diff > 0) { 153 if (qp->resp.sent_psn_nak) 154 return RESPST_CLEANUP; 155 156 qp->resp.sent_psn_nak = 1; 157 rxe_counter_inc(rxe, RXE_CNT_OUT_OF_SEQ_REQ); 158 return RESPST_ERR_PSN_OUT_OF_SEQ; 159 160 } else if (diff < 0) { 161 rxe_counter_inc(rxe, RXE_CNT_DUP_REQ); 162 return RESPST_DUPLICATE_REQUEST; 163 } 164 165 if (qp->resp.sent_psn_nak) 166 qp->resp.sent_psn_nak = 0; 167 168 break; 169 170 case IB_QPT_UC: 171 if (qp->resp.drop_msg || diff != 0) { 172 if (pkt->mask & RXE_START_MASK) { 173 qp->resp.drop_msg = 0; 174 return RESPST_CHK_OP_SEQ; 175 } 176 177 qp->resp.drop_msg = 1; 178 return RESPST_CLEANUP; 179 } 180 break; 181 default: 182 break; 183 } 184 185 return RESPST_CHK_OP_SEQ; 186 } 187 188 static enum resp_states check_op_seq(struct rxe_qp *qp, 189 struct rxe_pkt_info *pkt) 190 { 191 switch (qp_type(qp)) { 192 case IB_QPT_RC: 193 switch (qp->resp.opcode) { 194 case IB_OPCODE_RC_SEND_FIRST: 195 case IB_OPCODE_RC_SEND_MIDDLE: 196 switch (pkt->opcode) { 197 case IB_OPCODE_RC_SEND_MIDDLE: 198 case IB_OPCODE_RC_SEND_LAST: 199 case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE: 200 case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE: 201 return RESPST_CHK_OP_VALID; 202 default: 203 return RESPST_ERR_MISSING_OPCODE_LAST_C; 204 } 205 206 case IB_OPCODE_RC_RDMA_WRITE_FIRST: 207 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE: 208 switch (pkt->opcode) { 209 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE: 210 case IB_OPCODE_RC_RDMA_WRITE_LAST: 211 case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE: 212 return RESPST_CHK_OP_VALID; 213 default: 214 return RESPST_ERR_MISSING_OPCODE_LAST_C; 215 } 216 217 default: 218 switch (pkt->opcode) { 219 case IB_OPCODE_RC_SEND_MIDDLE: 220 case IB_OPCODE_RC_SEND_LAST: 221 case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE: 222 case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE: 223 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE: 224 case IB_OPCODE_RC_RDMA_WRITE_LAST: 225 case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE: 226 return RESPST_ERR_MISSING_OPCODE_FIRST; 227 default: 228 return RESPST_CHK_OP_VALID; 229 } 230 } 231 break; 232 233 case IB_QPT_UC: 234 switch (qp->resp.opcode) { 235 case IB_OPCODE_UC_SEND_FIRST: 236 case IB_OPCODE_UC_SEND_MIDDLE: 237 switch (pkt->opcode) { 238 case IB_OPCODE_UC_SEND_MIDDLE: 239 case IB_OPCODE_UC_SEND_LAST: 240 case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE: 241 return RESPST_CHK_OP_VALID; 242 default: 243 return RESPST_ERR_MISSING_OPCODE_LAST_D1E; 244 } 245 246 case IB_OPCODE_UC_RDMA_WRITE_FIRST: 247 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE: 248 switch (pkt->opcode) { 249 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE: 250 case IB_OPCODE_UC_RDMA_WRITE_LAST: 251 case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE: 252 return RESPST_CHK_OP_VALID; 253 default: 254 return RESPST_ERR_MISSING_OPCODE_LAST_D1E; 255 } 256 257 default: 258 switch (pkt->opcode) { 259 case IB_OPCODE_UC_SEND_MIDDLE: 260 case IB_OPCODE_UC_SEND_LAST: 261 case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE: 262 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE: 263 case IB_OPCODE_UC_RDMA_WRITE_LAST: 264 case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE: 265 qp->resp.drop_msg = 1; 266 return RESPST_CLEANUP; 267 default: 268 return RESPST_CHK_OP_VALID; 269 } 270 } 271 break; 272 273 default: 274 return RESPST_CHK_OP_VALID; 275 } 276 } 277 278 static enum resp_states check_op_valid(struct rxe_qp *qp, 279 struct rxe_pkt_info *pkt) 280 { 281 switch (qp_type(qp)) { 282 case IB_QPT_RC: 283 if (((pkt->mask & RXE_READ_MASK) && 284 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_READ)) || 285 ((pkt->mask & RXE_WRITE_MASK) && 286 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) || 287 ((pkt->mask & RXE_ATOMIC_MASK) && 288 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) { 289 return RESPST_ERR_UNSUPPORTED_OPCODE; 290 } 291 292 break; 293 294 case IB_QPT_UC: 295 if ((pkt->mask & RXE_WRITE_MASK) && 296 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) { 297 qp->resp.drop_msg = 1; 298 return RESPST_CLEANUP; 299 } 300 301 break; 302 303 case IB_QPT_UD: 304 case IB_QPT_SMI: 305 case IB_QPT_GSI: 306 break; 307 308 default: 309 WARN_ON_ONCE(1); 310 break; 311 } 312 313 return RESPST_CHK_RESOURCE; 314 } 315 316 static enum resp_states get_srq_wqe(struct rxe_qp *qp) 317 { 318 struct rxe_srq *srq = qp->srq; 319 struct rxe_queue *q = srq->rq.queue; 320 struct rxe_recv_wqe *wqe; 321 struct ib_event ev; 322 323 if (srq->error) 324 return RESPST_ERR_RNR; 325 326 spin_lock_bh(&srq->rq.consumer_lock); 327 328 wqe = queue_head(q); 329 if (!wqe) { 330 spin_unlock_bh(&srq->rq.consumer_lock); 331 return RESPST_ERR_RNR; 332 } 333 334 /* note kernel and user space recv wqes have same size */ 335 memcpy(&qp->resp.srq_wqe, wqe, sizeof(qp->resp.srq_wqe)); 336 337 qp->resp.wqe = &qp->resp.srq_wqe.wqe; 338 advance_consumer(q); 339 340 if (srq->limit && srq->ibsrq.event_handler && 341 (queue_count(q) < srq->limit)) { 342 srq->limit = 0; 343 goto event; 344 } 345 346 spin_unlock_bh(&srq->rq.consumer_lock); 347 return RESPST_CHK_LENGTH; 348 349 event: 350 spin_unlock_bh(&srq->rq.consumer_lock); 351 ev.device = qp->ibqp.device; 352 ev.element.srq = qp->ibqp.srq; 353 ev.event = IB_EVENT_SRQ_LIMIT_REACHED; 354 srq->ibsrq.event_handler(&ev, srq->ibsrq.srq_context); 355 return RESPST_CHK_LENGTH; 356 } 357 358 static enum resp_states check_resource(struct rxe_qp *qp, 359 struct rxe_pkt_info *pkt) 360 { 361 struct rxe_srq *srq = qp->srq; 362 363 if (qp->resp.state == QP_STATE_ERROR) { 364 if (qp->resp.wqe) { 365 qp->resp.status = IB_WC_WR_FLUSH_ERR; 366 return RESPST_COMPLETE; 367 } else if (!srq) { 368 qp->resp.wqe = queue_head(qp->rq.queue); 369 if (qp->resp.wqe) { 370 qp->resp.status = IB_WC_WR_FLUSH_ERR; 371 return RESPST_COMPLETE; 372 } else { 373 return RESPST_EXIT; 374 } 375 } else { 376 return RESPST_EXIT; 377 } 378 } 379 380 if (pkt->mask & RXE_READ_OR_ATOMIC) { 381 /* it is the requesters job to not send 382 * too many read/atomic ops, we just 383 * recycle the responder resource queue 384 */ 385 if (likely(qp->attr.max_dest_rd_atomic > 0)) 386 return RESPST_CHK_LENGTH; 387 else 388 return RESPST_ERR_TOO_MANY_RDMA_ATM_REQ; 389 } 390 391 if (pkt->mask & RXE_RWR_MASK) { 392 if (srq) 393 return get_srq_wqe(qp); 394 395 qp->resp.wqe = queue_head(qp->rq.queue); 396 return (qp->resp.wqe) ? RESPST_CHK_LENGTH : RESPST_ERR_RNR; 397 } 398 399 return RESPST_CHK_LENGTH; 400 } 401 402 static enum resp_states check_length(struct rxe_qp *qp, 403 struct rxe_pkt_info *pkt) 404 { 405 switch (qp_type(qp)) { 406 case IB_QPT_RC: 407 return RESPST_CHK_RKEY; 408 409 case IB_QPT_UC: 410 return RESPST_CHK_RKEY; 411 412 default: 413 return RESPST_CHK_RKEY; 414 } 415 } 416 417 static enum resp_states check_rkey(struct rxe_qp *qp, 418 struct rxe_pkt_info *pkt) 419 { 420 struct rxe_mem *mem = NULL; 421 u64 va; 422 u32 rkey; 423 u32 resid; 424 u32 pktlen; 425 int mtu = qp->mtu; 426 enum resp_states state; 427 int access; 428 429 if (pkt->mask & (RXE_READ_MASK | RXE_WRITE_MASK)) { 430 if (pkt->mask & RXE_RETH_MASK) { 431 qp->resp.va = reth_va(pkt); 432 qp->resp.rkey = reth_rkey(pkt); 433 qp->resp.resid = reth_len(pkt); 434 qp->resp.length = reth_len(pkt); 435 } 436 access = (pkt->mask & RXE_READ_MASK) ? IB_ACCESS_REMOTE_READ 437 : IB_ACCESS_REMOTE_WRITE; 438 } else if (pkt->mask & RXE_ATOMIC_MASK) { 439 qp->resp.va = atmeth_va(pkt); 440 qp->resp.rkey = atmeth_rkey(pkt); 441 qp->resp.resid = sizeof(u64); 442 access = IB_ACCESS_REMOTE_ATOMIC; 443 } else { 444 return RESPST_EXECUTE; 445 } 446 447 /* A zero-byte op is not required to set an addr or rkey. */ 448 if ((pkt->mask & (RXE_READ_MASK | RXE_WRITE_OR_SEND)) && 449 (pkt->mask & RXE_RETH_MASK) && 450 reth_len(pkt) == 0) { 451 return RESPST_EXECUTE; 452 } 453 454 va = qp->resp.va; 455 rkey = qp->resp.rkey; 456 resid = qp->resp.resid; 457 pktlen = payload_size(pkt); 458 459 mem = lookup_mem(qp->pd, access, rkey, lookup_remote); 460 if (!mem) { 461 state = RESPST_ERR_RKEY_VIOLATION; 462 goto err; 463 } 464 465 if (unlikely(mem->state == RXE_MEM_STATE_FREE)) { 466 state = RESPST_ERR_RKEY_VIOLATION; 467 goto err; 468 } 469 470 if (mem_check_range(mem, va, resid)) { 471 state = RESPST_ERR_RKEY_VIOLATION; 472 goto err; 473 } 474 475 if (pkt->mask & RXE_WRITE_MASK) { 476 if (resid > mtu) { 477 if (pktlen != mtu || bth_pad(pkt)) { 478 state = RESPST_ERR_LENGTH; 479 goto err; 480 } 481 } else { 482 if (pktlen != resid) { 483 state = RESPST_ERR_LENGTH; 484 goto err; 485 } 486 if ((bth_pad(pkt) != (0x3 & (-resid)))) { 487 /* This case may not be exactly that 488 * but nothing else fits. 489 */ 490 state = RESPST_ERR_LENGTH; 491 goto err; 492 } 493 } 494 } 495 496 WARN_ON_ONCE(qp->resp.mr); 497 498 qp->resp.mr = mem; 499 return RESPST_EXECUTE; 500 501 err: 502 if (mem) 503 rxe_drop_ref(mem); 504 return state; 505 } 506 507 static enum resp_states send_data_in(struct rxe_qp *qp, void *data_addr, 508 int data_len) 509 { 510 int err; 511 512 err = copy_data(qp->pd, IB_ACCESS_LOCAL_WRITE, &qp->resp.wqe->dma, 513 data_addr, data_len, to_mem_obj, NULL); 514 if (unlikely(err)) 515 return (err == -ENOSPC) ? RESPST_ERR_LENGTH 516 : RESPST_ERR_MALFORMED_WQE; 517 518 return RESPST_NONE; 519 } 520 521 static enum resp_states write_data_in(struct rxe_qp *qp, 522 struct rxe_pkt_info *pkt) 523 { 524 enum resp_states rc = RESPST_NONE; 525 int err; 526 int data_len = payload_size(pkt); 527 528 err = rxe_mem_copy(qp->resp.mr, qp->resp.va, payload_addr(pkt), 529 data_len, to_mem_obj, NULL); 530 if (err) { 531 rc = RESPST_ERR_RKEY_VIOLATION; 532 goto out; 533 } 534 535 qp->resp.va += data_len; 536 qp->resp.resid -= data_len; 537 538 out: 539 return rc; 540 } 541 542 /* Guarantee atomicity of atomic operations at the machine level. */ 543 static DEFINE_SPINLOCK(atomic_ops_lock); 544 545 static enum resp_states process_atomic(struct rxe_qp *qp, 546 struct rxe_pkt_info *pkt) 547 { 548 u64 iova = atmeth_va(pkt); 549 u64 *vaddr; 550 enum resp_states ret; 551 struct rxe_mem *mr = qp->resp.mr; 552 553 if (mr->state != RXE_MEM_STATE_VALID) { 554 ret = RESPST_ERR_RKEY_VIOLATION; 555 goto out; 556 } 557 558 vaddr = iova_to_vaddr(mr, iova, sizeof(u64)); 559 560 /* check vaddr is 8 bytes aligned. */ 561 if (!vaddr || (uintptr_t)vaddr & 7) { 562 ret = RESPST_ERR_MISALIGNED_ATOMIC; 563 goto out; 564 } 565 566 spin_lock_bh(&atomic_ops_lock); 567 568 qp->resp.atomic_orig = *vaddr; 569 570 if (pkt->opcode == IB_OPCODE_RC_COMPARE_SWAP || 571 pkt->opcode == IB_OPCODE_RD_COMPARE_SWAP) { 572 if (*vaddr == atmeth_comp(pkt)) 573 *vaddr = atmeth_swap_add(pkt); 574 } else { 575 *vaddr += atmeth_swap_add(pkt); 576 } 577 578 spin_unlock_bh(&atomic_ops_lock); 579 580 ret = RESPST_NONE; 581 out: 582 return ret; 583 } 584 585 static struct sk_buff *prepare_ack_packet(struct rxe_qp *qp, 586 struct rxe_pkt_info *pkt, 587 struct rxe_pkt_info *ack, 588 int opcode, 589 int payload, 590 u32 psn, 591 u8 syndrome, 592 u32 *crcp) 593 { 594 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 595 struct sk_buff *skb; 596 u32 crc = 0; 597 u32 *p; 598 int paylen; 599 int pad; 600 int err; 601 602 /* 603 * allocate packet 604 */ 605 pad = (-payload) & 0x3; 606 paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE; 607 608 skb = rxe_init_packet(rxe, &qp->pri_av, paylen, ack); 609 if (!skb) 610 return NULL; 611 612 ack->qp = qp; 613 ack->opcode = opcode; 614 ack->mask = rxe_opcode[opcode].mask; 615 ack->offset = pkt->offset; 616 ack->paylen = paylen; 617 618 /* fill in bth using the request packet headers */ 619 memcpy(ack->hdr, pkt->hdr, pkt->offset + RXE_BTH_BYTES); 620 621 bth_set_opcode(ack, opcode); 622 bth_set_qpn(ack, qp->attr.dest_qp_num); 623 bth_set_pad(ack, pad); 624 bth_set_se(ack, 0); 625 bth_set_psn(ack, psn); 626 bth_set_ack(ack, 0); 627 ack->psn = psn; 628 629 if (ack->mask & RXE_AETH_MASK) { 630 aeth_set_syn(ack, syndrome); 631 aeth_set_msn(ack, qp->resp.msn); 632 } 633 634 if (ack->mask & RXE_ATMACK_MASK) 635 atmack_set_orig(ack, qp->resp.atomic_orig); 636 637 err = rxe_prepare(ack, skb, &crc); 638 if (err) { 639 kfree_skb(skb); 640 return NULL; 641 } 642 643 if (crcp) { 644 /* CRC computation will be continued by the caller */ 645 *crcp = crc; 646 } else { 647 p = payload_addr(ack) + payload + bth_pad(ack); 648 *p = ~crc; 649 } 650 651 return skb; 652 } 653 654 /* RDMA read response. If res is not NULL, then we have a current RDMA request 655 * being processed or replayed. 656 */ 657 static enum resp_states read_reply(struct rxe_qp *qp, 658 struct rxe_pkt_info *req_pkt) 659 { 660 struct rxe_pkt_info ack_pkt; 661 struct sk_buff *skb; 662 int mtu = qp->mtu; 663 enum resp_states state; 664 int payload; 665 int opcode; 666 int err; 667 struct resp_res *res = qp->resp.res; 668 u32 icrc; 669 u32 *p; 670 671 if (!res) { 672 /* This is the first time we process that request. Get a 673 * resource 674 */ 675 res = &qp->resp.resources[qp->resp.res_head]; 676 677 free_rd_atomic_resource(qp, res); 678 rxe_advance_resp_resource(qp); 679 680 res->type = RXE_READ_MASK; 681 res->replay = 0; 682 683 res->read.va = qp->resp.va; 684 res->read.va_org = qp->resp.va; 685 686 res->first_psn = req_pkt->psn; 687 688 if (reth_len(req_pkt)) { 689 res->last_psn = (req_pkt->psn + 690 (reth_len(req_pkt) + mtu - 1) / 691 mtu - 1) & BTH_PSN_MASK; 692 } else { 693 res->last_psn = res->first_psn; 694 } 695 res->cur_psn = req_pkt->psn; 696 697 res->read.resid = qp->resp.resid; 698 res->read.length = qp->resp.resid; 699 res->read.rkey = qp->resp.rkey; 700 701 /* note res inherits the reference to mr from qp */ 702 res->read.mr = qp->resp.mr; 703 qp->resp.mr = NULL; 704 705 qp->resp.res = res; 706 res->state = rdatm_res_state_new; 707 } 708 709 if (res->state == rdatm_res_state_new) { 710 if (res->read.resid <= mtu) 711 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_ONLY; 712 else 713 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST; 714 } else { 715 if (res->read.resid > mtu) 716 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE; 717 else 718 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_LAST; 719 } 720 721 res->state = rdatm_res_state_next; 722 723 payload = min_t(int, res->read.resid, mtu); 724 725 skb = prepare_ack_packet(qp, req_pkt, &ack_pkt, opcode, payload, 726 res->cur_psn, AETH_ACK_UNLIMITED, &icrc); 727 if (!skb) 728 return RESPST_ERR_RNR; 729 730 err = rxe_mem_copy(res->read.mr, res->read.va, payload_addr(&ack_pkt), 731 payload, from_mem_obj, &icrc); 732 if (err) 733 pr_err("Failed copying memory\n"); 734 735 if (bth_pad(&ack_pkt)) { 736 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 737 u8 *pad = payload_addr(&ack_pkt) + payload; 738 739 memset(pad, 0, bth_pad(&ack_pkt)); 740 icrc = rxe_crc32(rxe, icrc, pad, bth_pad(&ack_pkt)); 741 } 742 p = payload_addr(&ack_pkt) + payload + bth_pad(&ack_pkt); 743 *p = ~icrc; 744 745 err = rxe_xmit_packet(qp, &ack_pkt, skb); 746 if (err) { 747 pr_err("Failed sending RDMA reply.\n"); 748 return RESPST_ERR_RNR; 749 } 750 751 res->read.va += payload; 752 res->read.resid -= payload; 753 res->cur_psn = (res->cur_psn + 1) & BTH_PSN_MASK; 754 755 if (res->read.resid > 0) { 756 state = RESPST_DONE; 757 } else { 758 qp->resp.res = NULL; 759 if (!res->replay) 760 qp->resp.opcode = -1; 761 if (psn_compare(res->cur_psn, qp->resp.psn) >= 0) 762 qp->resp.psn = res->cur_psn; 763 state = RESPST_CLEANUP; 764 } 765 766 return state; 767 } 768 769 static void build_rdma_network_hdr(union rdma_network_hdr *hdr, 770 struct rxe_pkt_info *pkt) 771 { 772 struct sk_buff *skb = PKT_TO_SKB(pkt); 773 774 memset(hdr, 0, sizeof(*hdr)); 775 if (skb->protocol == htons(ETH_P_IP)) 776 memcpy(&hdr->roce4grh, ip_hdr(skb), sizeof(hdr->roce4grh)); 777 else if (skb->protocol == htons(ETH_P_IPV6)) 778 memcpy(&hdr->ibgrh, ipv6_hdr(skb), sizeof(hdr->ibgrh)); 779 } 780 781 /* Executes a new request. A retried request never reach that function (send 782 * and writes are discarded, and reads and atomics are retried elsewhere. 783 */ 784 static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt) 785 { 786 enum resp_states err; 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 union rdma_network_hdr hdr; 793 794 build_rdma_network_hdr(&hdr, pkt); 795 796 err = send_data_in(qp, &hdr, sizeof(hdr)); 797 if (err) 798 return err; 799 } 800 err = send_data_in(qp, payload_addr(pkt), payload_size(pkt)); 801 if (err) 802 return err; 803 } else if (pkt->mask & RXE_WRITE_MASK) { 804 err = write_data_in(qp, pkt); 805 if (err) 806 return err; 807 } else if (pkt->mask & RXE_READ_MASK) { 808 /* For RDMA Read we can increment the msn now. See C9-148. */ 809 qp->resp.msn++; 810 return RESPST_READ_REPLY; 811 } else if (pkt->mask & RXE_ATOMIC_MASK) { 812 err = process_atomic(qp, pkt); 813 if (err) 814 return err; 815 } else { 816 /* Unreachable */ 817 WARN_ON_ONCE(1); 818 } 819 820 /* next expected psn, read handles this separately */ 821 qp->resp.psn = (pkt->psn + 1) & BTH_PSN_MASK; 822 qp->resp.ack_psn = qp->resp.psn; 823 824 qp->resp.opcode = pkt->opcode; 825 qp->resp.status = IB_WC_SUCCESS; 826 827 if (pkt->mask & RXE_COMP_MASK) { 828 /* We successfully processed this new request. */ 829 qp->resp.msn++; 830 return RESPST_COMPLETE; 831 } else if (qp_type(qp) == IB_QPT_RC) 832 return RESPST_ACKNOWLEDGE; 833 else 834 return RESPST_CLEANUP; 835 } 836 837 static enum resp_states do_complete(struct rxe_qp *qp, 838 struct rxe_pkt_info *pkt) 839 { 840 struct rxe_cqe cqe; 841 struct ib_wc *wc = &cqe.ibwc; 842 struct ib_uverbs_wc *uwc = &cqe.uibwc; 843 struct rxe_recv_wqe *wqe = qp->resp.wqe; 844 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 845 846 if (unlikely(!wqe)) 847 return RESPST_CLEANUP; 848 849 memset(&cqe, 0, sizeof(cqe)); 850 851 if (qp->rcq->is_user) { 852 uwc->status = qp->resp.status; 853 uwc->qp_num = qp->ibqp.qp_num; 854 uwc->wr_id = wqe->wr_id; 855 } else { 856 wc->status = qp->resp.status; 857 wc->qp = &qp->ibqp; 858 wc->wr_id = wqe->wr_id; 859 } 860 861 if (wc->status == IB_WC_SUCCESS) { 862 rxe_counter_inc(rxe, RXE_CNT_RDMA_RECV); 863 wc->opcode = (pkt->mask & RXE_IMMDT_MASK && 864 pkt->mask & RXE_WRITE_MASK) ? 865 IB_WC_RECV_RDMA_WITH_IMM : IB_WC_RECV; 866 wc->vendor_err = 0; 867 wc->byte_len = (pkt->mask & RXE_IMMDT_MASK && 868 pkt->mask & RXE_WRITE_MASK) ? 869 qp->resp.length : wqe->dma.length - wqe->dma.resid; 870 871 /* fields after byte_len are different between kernel and user 872 * space 873 */ 874 if (qp->rcq->is_user) { 875 uwc->wc_flags = IB_WC_GRH; 876 877 if (pkt->mask & RXE_IMMDT_MASK) { 878 uwc->wc_flags |= IB_WC_WITH_IMM; 879 uwc->ex.imm_data = immdt_imm(pkt); 880 } 881 882 if (pkt->mask & RXE_IETH_MASK) { 883 uwc->wc_flags |= IB_WC_WITH_INVALIDATE; 884 uwc->ex.invalidate_rkey = ieth_rkey(pkt); 885 } 886 887 uwc->qp_num = qp->ibqp.qp_num; 888 889 if (pkt->mask & RXE_DETH_MASK) 890 uwc->src_qp = deth_sqp(pkt); 891 892 uwc->port_num = qp->attr.port_num; 893 } else { 894 struct sk_buff *skb = PKT_TO_SKB(pkt); 895 896 wc->wc_flags = IB_WC_GRH | IB_WC_WITH_NETWORK_HDR_TYPE; 897 if (skb->protocol == htons(ETH_P_IP)) 898 wc->network_hdr_type = RDMA_NETWORK_IPV4; 899 else 900 wc->network_hdr_type = RDMA_NETWORK_IPV6; 901 902 if (is_vlan_dev(skb->dev)) { 903 wc->wc_flags |= IB_WC_WITH_VLAN; 904 wc->vlan_id = vlan_dev_vlan_id(skb->dev); 905 } 906 907 if (pkt->mask & RXE_IMMDT_MASK) { 908 wc->wc_flags |= IB_WC_WITH_IMM; 909 wc->ex.imm_data = immdt_imm(pkt); 910 } 911 912 if (pkt->mask & RXE_IETH_MASK) { 913 struct rxe_mem *rmr; 914 915 wc->wc_flags |= IB_WC_WITH_INVALIDATE; 916 wc->ex.invalidate_rkey = ieth_rkey(pkt); 917 918 rmr = rxe_pool_get_index(&rxe->mr_pool, 919 wc->ex.invalidate_rkey >> 8); 920 if (unlikely(!rmr)) { 921 pr_err("Bad rkey %#x invalidation\n", 922 wc->ex.invalidate_rkey); 923 return RESPST_ERROR; 924 } 925 rmr->state = RXE_MEM_STATE_FREE; 926 rxe_drop_ref(rmr); 927 } 928 929 wc->qp = &qp->ibqp; 930 931 if (pkt->mask & RXE_DETH_MASK) 932 wc->src_qp = deth_sqp(pkt); 933 934 wc->port_num = qp->attr.port_num; 935 } 936 } 937 938 /* have copy for srq and reference for !srq */ 939 if (!qp->srq) 940 advance_consumer(qp->rq.queue); 941 942 qp->resp.wqe = NULL; 943 944 if (rxe_cq_post(qp->rcq, &cqe, pkt ? bth_se(pkt) : 1)) 945 return RESPST_ERR_CQ_OVERFLOW; 946 947 if (qp->resp.state == QP_STATE_ERROR) 948 return RESPST_CHK_RESOURCE; 949 950 if (!pkt) 951 return RESPST_DONE; 952 else if (qp_type(qp) == IB_QPT_RC) 953 return RESPST_ACKNOWLEDGE; 954 else 955 return RESPST_CLEANUP; 956 } 957 958 static int send_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt, 959 u8 syndrome, u32 psn) 960 { 961 int err = 0; 962 struct rxe_pkt_info ack_pkt; 963 struct sk_buff *skb; 964 965 skb = prepare_ack_packet(qp, pkt, &ack_pkt, IB_OPCODE_RC_ACKNOWLEDGE, 966 0, psn, syndrome, NULL); 967 if (!skb) { 968 err = -ENOMEM; 969 goto err1; 970 } 971 972 err = rxe_xmit_packet(qp, &ack_pkt, skb); 973 if (err) 974 pr_err_ratelimited("Failed sending ack\n"); 975 976 err1: 977 return err; 978 } 979 980 static int send_atomic_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt, 981 u8 syndrome) 982 { 983 int rc = 0; 984 struct rxe_pkt_info ack_pkt; 985 struct sk_buff *skb; 986 struct resp_res *res; 987 988 skb = prepare_ack_packet(qp, pkt, &ack_pkt, 989 IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE, 0, pkt->psn, 990 syndrome, NULL); 991 if (!skb) { 992 rc = -ENOMEM; 993 goto out; 994 } 995 996 rxe_add_ref(qp); 997 998 res = &qp->resp.resources[qp->resp.res_head]; 999 free_rd_atomic_resource(qp, res); 1000 rxe_advance_resp_resource(qp); 1001 1002 memcpy(SKB_TO_PKT(skb), &ack_pkt, sizeof(ack_pkt)); 1003 memset((unsigned char *)SKB_TO_PKT(skb) + sizeof(ack_pkt), 0, 1004 sizeof(skb->cb) - sizeof(ack_pkt)); 1005 1006 skb_get(skb); 1007 res->type = RXE_ATOMIC_MASK; 1008 res->atomic.skb = skb; 1009 res->first_psn = ack_pkt.psn; 1010 res->last_psn = ack_pkt.psn; 1011 res->cur_psn = ack_pkt.psn; 1012 1013 rc = rxe_xmit_packet(qp, &ack_pkt, skb); 1014 if (rc) { 1015 pr_err_ratelimited("Failed sending ack\n"); 1016 rxe_drop_ref(qp); 1017 } 1018 out: 1019 return rc; 1020 } 1021 1022 static enum resp_states acknowledge(struct rxe_qp *qp, 1023 struct rxe_pkt_info *pkt) 1024 { 1025 if (qp_type(qp) != IB_QPT_RC) 1026 return RESPST_CLEANUP; 1027 1028 if (qp->resp.aeth_syndrome != AETH_ACK_UNLIMITED) 1029 send_ack(qp, pkt, qp->resp.aeth_syndrome, pkt->psn); 1030 else if (pkt->mask & RXE_ATOMIC_MASK) 1031 send_atomic_ack(qp, pkt, AETH_ACK_UNLIMITED); 1032 else if (bth_ack(pkt)) 1033 send_ack(qp, pkt, AETH_ACK_UNLIMITED, pkt->psn); 1034 1035 return RESPST_CLEANUP; 1036 } 1037 1038 static enum resp_states cleanup(struct rxe_qp *qp, 1039 struct rxe_pkt_info *pkt) 1040 { 1041 struct sk_buff *skb; 1042 1043 if (pkt) { 1044 skb = skb_dequeue(&qp->req_pkts); 1045 rxe_drop_ref(qp); 1046 kfree_skb(skb); 1047 } 1048 1049 if (qp->resp.mr) { 1050 rxe_drop_ref(qp->resp.mr); 1051 qp->resp.mr = NULL; 1052 } 1053 1054 return RESPST_DONE; 1055 } 1056 1057 static struct resp_res *find_resource(struct rxe_qp *qp, u32 psn) 1058 { 1059 int i; 1060 1061 for (i = 0; i < qp->attr.max_dest_rd_atomic; i++) { 1062 struct resp_res *res = &qp->resp.resources[i]; 1063 1064 if (res->type == 0) 1065 continue; 1066 1067 if (psn_compare(psn, res->first_psn) >= 0 && 1068 psn_compare(psn, res->last_psn) <= 0) { 1069 return res; 1070 } 1071 } 1072 1073 return NULL; 1074 } 1075 1076 static enum resp_states duplicate_request(struct rxe_qp *qp, 1077 struct rxe_pkt_info *pkt) 1078 { 1079 enum resp_states rc; 1080 u32 prev_psn = (qp->resp.ack_psn - 1) & BTH_PSN_MASK; 1081 1082 if (pkt->mask & RXE_SEND_MASK || 1083 pkt->mask & RXE_WRITE_MASK) { 1084 /* SEND. Ack again and cleanup. C9-105. */ 1085 if (bth_ack(pkt)) 1086 send_ack(qp, pkt, AETH_ACK_UNLIMITED, prev_psn); 1087 rc = RESPST_CLEANUP; 1088 goto out; 1089 } else if (pkt->mask & RXE_READ_MASK) { 1090 struct resp_res *res; 1091 1092 res = find_resource(qp, pkt->psn); 1093 if (!res) { 1094 /* Resource not found. Class D error. Drop the 1095 * request. 1096 */ 1097 rc = RESPST_CLEANUP; 1098 goto out; 1099 } else { 1100 /* Ensure this new request is the same as the previous 1101 * one or a subset of it. 1102 */ 1103 u64 iova = reth_va(pkt); 1104 u32 resid = reth_len(pkt); 1105 1106 if (iova < res->read.va_org || 1107 resid > res->read.length || 1108 (iova + resid) > (res->read.va_org + 1109 res->read.length)) { 1110 rc = RESPST_CLEANUP; 1111 goto out; 1112 } 1113 1114 if (reth_rkey(pkt) != res->read.rkey) { 1115 rc = RESPST_CLEANUP; 1116 goto out; 1117 } 1118 1119 res->cur_psn = pkt->psn; 1120 res->state = (pkt->psn == res->first_psn) ? 1121 rdatm_res_state_new : 1122 rdatm_res_state_replay; 1123 res->replay = 1; 1124 1125 /* Reset the resource, except length. */ 1126 res->read.va_org = iova; 1127 res->read.va = iova; 1128 res->read.resid = resid; 1129 1130 /* Replay the RDMA read reply. */ 1131 qp->resp.res = res; 1132 rc = RESPST_READ_REPLY; 1133 goto out; 1134 } 1135 } else { 1136 struct resp_res *res; 1137 1138 /* Find the operation in our list of responder resources. */ 1139 res = find_resource(qp, pkt->psn); 1140 if (res) { 1141 skb_get(res->atomic.skb); 1142 /* Resend the result. */ 1143 rc = rxe_xmit_packet(qp, pkt, res->atomic.skb); 1144 if (rc) { 1145 pr_err("Failed resending result. This flow is not handled - skb ignored\n"); 1146 rc = RESPST_CLEANUP; 1147 goto out; 1148 } 1149 } 1150 1151 /* Resource not found. Class D error. Drop the request. */ 1152 rc = RESPST_CLEANUP; 1153 goto out; 1154 } 1155 out: 1156 return rc; 1157 } 1158 1159 /* Process a class A or C. Both are treated the same in this implementation. */ 1160 static void do_class_ac_error(struct rxe_qp *qp, u8 syndrome, 1161 enum ib_wc_status status) 1162 { 1163 qp->resp.aeth_syndrome = syndrome; 1164 qp->resp.status = status; 1165 1166 /* indicate that we should go through the ERROR state */ 1167 qp->resp.goto_error = 1; 1168 } 1169 1170 static enum resp_states do_class_d1e_error(struct rxe_qp *qp) 1171 { 1172 /* UC */ 1173 if (qp->srq) { 1174 /* Class E */ 1175 qp->resp.drop_msg = 1; 1176 if (qp->resp.wqe) { 1177 qp->resp.status = IB_WC_REM_INV_REQ_ERR; 1178 return RESPST_COMPLETE; 1179 } else { 1180 return RESPST_CLEANUP; 1181 } 1182 } else { 1183 /* Class D1. This packet may be the start of a 1184 * new message and could be valid. The previous 1185 * message is invalid and ignored. reset the 1186 * recv wr to its original state 1187 */ 1188 if (qp->resp.wqe) { 1189 qp->resp.wqe->dma.resid = qp->resp.wqe->dma.length; 1190 qp->resp.wqe->dma.cur_sge = 0; 1191 qp->resp.wqe->dma.sge_offset = 0; 1192 qp->resp.opcode = -1; 1193 } 1194 1195 if (qp->resp.mr) { 1196 rxe_drop_ref(qp->resp.mr); 1197 qp->resp.mr = NULL; 1198 } 1199 1200 return RESPST_CLEANUP; 1201 } 1202 } 1203 1204 static void rxe_drain_req_pkts(struct rxe_qp *qp, bool notify) 1205 { 1206 struct sk_buff *skb; 1207 1208 while ((skb = skb_dequeue(&qp->req_pkts))) { 1209 rxe_drop_ref(qp); 1210 kfree_skb(skb); 1211 } 1212 1213 if (notify) 1214 return; 1215 1216 while (!qp->srq && qp->rq.queue && queue_head(qp->rq.queue)) 1217 advance_consumer(qp->rq.queue); 1218 } 1219 1220 int rxe_responder(void *arg) 1221 { 1222 struct rxe_qp *qp = (struct rxe_qp *)arg; 1223 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 1224 enum resp_states state; 1225 struct rxe_pkt_info *pkt = NULL; 1226 int ret = 0; 1227 1228 rxe_add_ref(qp); 1229 1230 qp->resp.aeth_syndrome = AETH_ACK_UNLIMITED; 1231 1232 if (!qp->valid) { 1233 ret = -EINVAL; 1234 goto done; 1235 } 1236 1237 switch (qp->resp.state) { 1238 case QP_STATE_RESET: 1239 state = RESPST_RESET; 1240 break; 1241 1242 default: 1243 state = RESPST_GET_REQ; 1244 break; 1245 } 1246 1247 while (1) { 1248 pr_debug("qp#%d state = %s\n", qp_num(qp), 1249 resp_state_name[state]); 1250 switch (state) { 1251 case RESPST_GET_REQ: 1252 state = get_req(qp, &pkt); 1253 break; 1254 case RESPST_CHK_PSN: 1255 state = check_psn(qp, pkt); 1256 break; 1257 case RESPST_CHK_OP_SEQ: 1258 state = check_op_seq(qp, pkt); 1259 break; 1260 case RESPST_CHK_OP_VALID: 1261 state = check_op_valid(qp, pkt); 1262 break; 1263 case RESPST_CHK_RESOURCE: 1264 state = check_resource(qp, pkt); 1265 break; 1266 case RESPST_CHK_LENGTH: 1267 state = check_length(qp, pkt); 1268 break; 1269 case RESPST_CHK_RKEY: 1270 state = check_rkey(qp, pkt); 1271 break; 1272 case RESPST_EXECUTE: 1273 state = execute(qp, pkt); 1274 break; 1275 case RESPST_COMPLETE: 1276 state = do_complete(qp, pkt); 1277 break; 1278 case RESPST_READ_REPLY: 1279 state = read_reply(qp, pkt); 1280 break; 1281 case RESPST_ACKNOWLEDGE: 1282 state = acknowledge(qp, pkt); 1283 break; 1284 case RESPST_CLEANUP: 1285 state = cleanup(qp, pkt); 1286 break; 1287 case RESPST_DUPLICATE_REQUEST: 1288 state = duplicate_request(qp, pkt); 1289 break; 1290 case RESPST_ERR_PSN_OUT_OF_SEQ: 1291 /* RC only - Class B. Drop packet. */ 1292 send_ack(qp, pkt, AETH_NAK_PSN_SEQ_ERROR, qp->resp.psn); 1293 state = RESPST_CLEANUP; 1294 break; 1295 1296 case RESPST_ERR_TOO_MANY_RDMA_ATM_REQ: 1297 case RESPST_ERR_MISSING_OPCODE_FIRST: 1298 case RESPST_ERR_MISSING_OPCODE_LAST_C: 1299 case RESPST_ERR_UNSUPPORTED_OPCODE: 1300 case RESPST_ERR_MISALIGNED_ATOMIC: 1301 /* RC Only - Class C. */ 1302 do_class_ac_error(qp, AETH_NAK_INVALID_REQ, 1303 IB_WC_REM_INV_REQ_ERR); 1304 state = RESPST_COMPLETE; 1305 break; 1306 1307 case RESPST_ERR_MISSING_OPCODE_LAST_D1E: 1308 state = do_class_d1e_error(qp); 1309 break; 1310 case RESPST_ERR_RNR: 1311 if (qp_type(qp) == IB_QPT_RC) { 1312 rxe_counter_inc(rxe, RXE_CNT_SND_RNR); 1313 /* RC - class B */ 1314 send_ack(qp, pkt, AETH_RNR_NAK | 1315 (~AETH_TYPE_MASK & 1316 qp->attr.min_rnr_timer), 1317 pkt->psn); 1318 } else { 1319 /* UD/UC - class D */ 1320 qp->resp.drop_msg = 1; 1321 } 1322 state = RESPST_CLEANUP; 1323 break; 1324 1325 case RESPST_ERR_RKEY_VIOLATION: 1326 if (qp_type(qp) == IB_QPT_RC) { 1327 /* Class C */ 1328 do_class_ac_error(qp, AETH_NAK_REM_ACC_ERR, 1329 IB_WC_REM_ACCESS_ERR); 1330 state = RESPST_COMPLETE; 1331 } else { 1332 qp->resp.drop_msg = 1; 1333 if (qp->srq) { 1334 /* UC/SRQ Class D */ 1335 qp->resp.status = IB_WC_REM_ACCESS_ERR; 1336 state = RESPST_COMPLETE; 1337 } else { 1338 /* UC/non-SRQ Class E. */ 1339 state = RESPST_CLEANUP; 1340 } 1341 } 1342 break; 1343 1344 case RESPST_ERR_LENGTH: 1345 if (qp_type(qp) == IB_QPT_RC) { 1346 /* Class C */ 1347 do_class_ac_error(qp, AETH_NAK_INVALID_REQ, 1348 IB_WC_REM_INV_REQ_ERR); 1349 state = RESPST_COMPLETE; 1350 } else if (qp->srq) { 1351 /* UC/UD - class E */ 1352 qp->resp.status = IB_WC_REM_INV_REQ_ERR; 1353 state = RESPST_COMPLETE; 1354 } else { 1355 /* UC/UD - class D */ 1356 qp->resp.drop_msg = 1; 1357 state = RESPST_CLEANUP; 1358 } 1359 break; 1360 1361 case RESPST_ERR_MALFORMED_WQE: 1362 /* All, Class A. */ 1363 do_class_ac_error(qp, AETH_NAK_REM_OP_ERR, 1364 IB_WC_LOC_QP_OP_ERR); 1365 state = RESPST_COMPLETE; 1366 break; 1367 1368 case RESPST_ERR_CQ_OVERFLOW: 1369 /* All - Class G */ 1370 state = RESPST_ERROR; 1371 break; 1372 1373 case RESPST_DONE: 1374 if (qp->resp.goto_error) { 1375 state = RESPST_ERROR; 1376 break; 1377 } 1378 1379 goto done; 1380 1381 case RESPST_EXIT: 1382 if (qp->resp.goto_error) { 1383 state = RESPST_ERROR; 1384 break; 1385 } 1386 1387 goto exit; 1388 1389 case RESPST_RESET: 1390 rxe_drain_req_pkts(qp, false); 1391 qp->resp.wqe = NULL; 1392 goto exit; 1393 1394 case RESPST_ERROR: 1395 qp->resp.goto_error = 0; 1396 pr_warn("qp#%d moved to error state\n", qp_num(qp)); 1397 rxe_qp_error(qp); 1398 goto exit; 1399 1400 default: 1401 WARN_ON_ONCE(1); 1402 } 1403 } 1404 1405 exit: 1406 ret = -EAGAIN; 1407 done: 1408 rxe_drop_ref(qp); 1409 return ret; 1410 } 1411