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_dev *rxe, struct rxe_qp *qp, 108 struct sk_buff *skb) 109 { 110 int must_sched; 111 struct rxe_pkt_info *pkt = SKB_TO_PKT(skb); 112 113 skb_queue_tail(&qp->req_pkts, skb); 114 115 must_sched = (pkt->opcode == IB_OPCODE_RC_RDMA_READ_REQUEST) || 116 (skb_queue_len(&qp->req_pkts) > 1); 117 118 rxe_run_task(&qp->resp.task, must_sched); 119 } 120 121 static inline enum resp_states get_req(struct rxe_qp *qp, 122 struct rxe_pkt_info **pkt_p) 123 { 124 struct sk_buff *skb; 125 126 if (qp->resp.state == QP_STATE_ERROR) { 127 skb = skb_dequeue(&qp->req_pkts); 128 if (skb) { 129 /* drain request packet queue */ 130 rxe_drop_ref(qp); 131 kfree_skb(skb); 132 return RESPST_GET_REQ; 133 } 134 135 /* go drain recv wr queue */ 136 return RESPST_CHK_RESOURCE; 137 } 138 139 skb = skb_peek(&qp->req_pkts); 140 if (!skb) 141 return RESPST_EXIT; 142 143 *pkt_p = SKB_TO_PKT(skb); 144 145 return (qp->resp.res) ? RESPST_READ_REPLY : RESPST_CHK_PSN; 146 } 147 148 static enum resp_states check_psn(struct rxe_qp *qp, 149 struct rxe_pkt_info *pkt) 150 { 151 int diff = psn_compare(pkt->psn, qp->resp.psn); 152 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 153 154 switch (qp_type(qp)) { 155 case IB_QPT_RC: 156 if (diff > 0) { 157 if (qp->resp.sent_psn_nak) 158 return RESPST_CLEANUP; 159 160 qp->resp.sent_psn_nak = 1; 161 rxe_counter_inc(rxe, RXE_CNT_OUT_OF_SEQ_REQ); 162 return RESPST_ERR_PSN_OUT_OF_SEQ; 163 164 } else if (diff < 0) { 165 rxe_counter_inc(rxe, RXE_CNT_DUP_REQ); 166 return RESPST_DUPLICATE_REQUEST; 167 } 168 169 if (qp->resp.sent_psn_nak) 170 qp->resp.sent_psn_nak = 0; 171 172 break; 173 174 case IB_QPT_UC: 175 if (qp->resp.drop_msg || diff != 0) { 176 if (pkt->mask & RXE_START_MASK) { 177 qp->resp.drop_msg = 0; 178 return RESPST_CHK_OP_SEQ; 179 } 180 181 qp->resp.drop_msg = 1; 182 return RESPST_CLEANUP; 183 } 184 break; 185 default: 186 break; 187 } 188 189 return RESPST_CHK_OP_SEQ; 190 } 191 192 static enum resp_states check_op_seq(struct rxe_qp *qp, 193 struct rxe_pkt_info *pkt) 194 { 195 switch (qp_type(qp)) { 196 case IB_QPT_RC: 197 switch (qp->resp.opcode) { 198 case IB_OPCODE_RC_SEND_FIRST: 199 case IB_OPCODE_RC_SEND_MIDDLE: 200 switch (pkt->opcode) { 201 case IB_OPCODE_RC_SEND_MIDDLE: 202 case IB_OPCODE_RC_SEND_LAST: 203 case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE: 204 case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE: 205 return RESPST_CHK_OP_VALID; 206 default: 207 return RESPST_ERR_MISSING_OPCODE_LAST_C; 208 } 209 210 case IB_OPCODE_RC_RDMA_WRITE_FIRST: 211 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE: 212 switch (pkt->opcode) { 213 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE: 214 case IB_OPCODE_RC_RDMA_WRITE_LAST: 215 case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE: 216 return RESPST_CHK_OP_VALID; 217 default: 218 return RESPST_ERR_MISSING_OPCODE_LAST_C; 219 } 220 221 default: 222 switch (pkt->opcode) { 223 case IB_OPCODE_RC_SEND_MIDDLE: 224 case IB_OPCODE_RC_SEND_LAST: 225 case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE: 226 case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE: 227 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE: 228 case IB_OPCODE_RC_RDMA_WRITE_LAST: 229 case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE: 230 return RESPST_ERR_MISSING_OPCODE_FIRST; 231 default: 232 return RESPST_CHK_OP_VALID; 233 } 234 } 235 break; 236 237 case IB_QPT_UC: 238 switch (qp->resp.opcode) { 239 case IB_OPCODE_UC_SEND_FIRST: 240 case IB_OPCODE_UC_SEND_MIDDLE: 241 switch (pkt->opcode) { 242 case IB_OPCODE_UC_SEND_MIDDLE: 243 case IB_OPCODE_UC_SEND_LAST: 244 case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE: 245 return RESPST_CHK_OP_VALID; 246 default: 247 return RESPST_ERR_MISSING_OPCODE_LAST_D1E; 248 } 249 250 case IB_OPCODE_UC_RDMA_WRITE_FIRST: 251 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE: 252 switch (pkt->opcode) { 253 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE: 254 case IB_OPCODE_UC_RDMA_WRITE_LAST: 255 case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE: 256 return RESPST_CHK_OP_VALID; 257 default: 258 return RESPST_ERR_MISSING_OPCODE_LAST_D1E; 259 } 260 261 default: 262 switch (pkt->opcode) { 263 case IB_OPCODE_UC_SEND_MIDDLE: 264 case IB_OPCODE_UC_SEND_LAST: 265 case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE: 266 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE: 267 case IB_OPCODE_UC_RDMA_WRITE_LAST: 268 case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE: 269 qp->resp.drop_msg = 1; 270 return RESPST_CLEANUP; 271 default: 272 return RESPST_CHK_OP_VALID; 273 } 274 } 275 break; 276 277 default: 278 return RESPST_CHK_OP_VALID; 279 } 280 } 281 282 static enum resp_states check_op_valid(struct rxe_qp *qp, 283 struct rxe_pkt_info *pkt) 284 { 285 switch (qp_type(qp)) { 286 case IB_QPT_RC: 287 if (((pkt->mask & RXE_READ_MASK) && 288 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_READ)) || 289 ((pkt->mask & RXE_WRITE_MASK) && 290 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) || 291 ((pkt->mask & RXE_ATOMIC_MASK) && 292 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) { 293 return RESPST_ERR_UNSUPPORTED_OPCODE; 294 } 295 296 break; 297 298 case IB_QPT_UC: 299 if ((pkt->mask & RXE_WRITE_MASK) && 300 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) { 301 qp->resp.drop_msg = 1; 302 return RESPST_CLEANUP; 303 } 304 305 break; 306 307 case IB_QPT_UD: 308 case IB_QPT_SMI: 309 case IB_QPT_GSI: 310 break; 311 312 default: 313 WARN_ON_ONCE(1); 314 break; 315 } 316 317 return RESPST_CHK_RESOURCE; 318 } 319 320 static enum resp_states get_srq_wqe(struct rxe_qp *qp) 321 { 322 struct rxe_srq *srq = qp->srq; 323 struct rxe_queue *q = srq->rq.queue; 324 struct rxe_recv_wqe *wqe; 325 struct ib_event ev; 326 327 if (srq->error) 328 return RESPST_ERR_RNR; 329 330 spin_lock_bh(&srq->rq.consumer_lock); 331 332 wqe = queue_head(q); 333 if (!wqe) { 334 spin_unlock_bh(&srq->rq.consumer_lock); 335 return RESPST_ERR_RNR; 336 } 337 338 /* note kernel and user space recv wqes have same size */ 339 memcpy(&qp->resp.srq_wqe, wqe, sizeof(qp->resp.srq_wqe)); 340 341 qp->resp.wqe = &qp->resp.srq_wqe.wqe; 342 advance_consumer(q); 343 344 if (srq->limit && srq->ibsrq.event_handler && 345 (queue_count(q) < srq->limit)) { 346 srq->limit = 0; 347 goto event; 348 } 349 350 spin_unlock_bh(&srq->rq.consumer_lock); 351 return RESPST_CHK_LENGTH; 352 353 event: 354 spin_unlock_bh(&srq->rq.consumer_lock); 355 ev.device = qp->ibqp.device; 356 ev.element.srq = qp->ibqp.srq; 357 ev.event = IB_EVENT_SRQ_LIMIT_REACHED; 358 srq->ibsrq.event_handler(&ev, srq->ibsrq.srq_context); 359 return RESPST_CHK_LENGTH; 360 } 361 362 static enum resp_states check_resource(struct rxe_qp *qp, 363 struct rxe_pkt_info *pkt) 364 { 365 struct rxe_srq *srq = qp->srq; 366 367 if (qp->resp.state == QP_STATE_ERROR) { 368 if (qp->resp.wqe) { 369 qp->resp.status = IB_WC_WR_FLUSH_ERR; 370 return RESPST_COMPLETE; 371 } else if (!srq) { 372 qp->resp.wqe = queue_head(qp->rq.queue); 373 if (qp->resp.wqe) { 374 qp->resp.status = IB_WC_WR_FLUSH_ERR; 375 return RESPST_COMPLETE; 376 } else { 377 return RESPST_EXIT; 378 } 379 } else { 380 return RESPST_EXIT; 381 } 382 } 383 384 if (pkt->mask & RXE_READ_OR_ATOMIC) { 385 /* it is the requesters job to not send 386 * too many read/atomic ops, we just 387 * recycle the responder resource queue 388 */ 389 if (likely(qp->attr.max_dest_rd_atomic > 0)) 390 return RESPST_CHK_LENGTH; 391 else 392 return RESPST_ERR_TOO_MANY_RDMA_ATM_REQ; 393 } 394 395 if (pkt->mask & RXE_RWR_MASK) { 396 if (srq) 397 return get_srq_wqe(qp); 398 399 qp->resp.wqe = queue_head(qp->rq.queue); 400 return (qp->resp.wqe) ? RESPST_CHK_LENGTH : RESPST_ERR_RNR; 401 } 402 403 return RESPST_CHK_LENGTH; 404 } 405 406 static enum resp_states check_length(struct rxe_qp *qp, 407 struct rxe_pkt_info *pkt) 408 { 409 switch (qp_type(qp)) { 410 case IB_QPT_RC: 411 return RESPST_CHK_RKEY; 412 413 case IB_QPT_UC: 414 return RESPST_CHK_RKEY; 415 416 default: 417 return RESPST_CHK_RKEY; 418 } 419 } 420 421 static enum resp_states check_rkey(struct rxe_qp *qp, 422 struct rxe_pkt_info *pkt) 423 { 424 struct rxe_mem *mem = NULL; 425 u64 va; 426 u32 rkey; 427 u32 resid; 428 u32 pktlen; 429 int mtu = qp->mtu; 430 enum resp_states state; 431 int access; 432 433 if (pkt->mask & (RXE_READ_MASK | RXE_WRITE_MASK)) { 434 if (pkt->mask & RXE_RETH_MASK) { 435 qp->resp.va = reth_va(pkt); 436 qp->resp.rkey = reth_rkey(pkt); 437 qp->resp.resid = reth_len(pkt); 438 } 439 access = (pkt->mask & RXE_READ_MASK) ? IB_ACCESS_REMOTE_READ 440 : IB_ACCESS_REMOTE_WRITE; 441 } else if (pkt->mask & RXE_ATOMIC_MASK) { 442 qp->resp.va = atmeth_va(pkt); 443 qp->resp.rkey = atmeth_rkey(pkt); 444 qp->resp.resid = sizeof(u64); 445 access = IB_ACCESS_REMOTE_ATOMIC; 446 } else { 447 return RESPST_EXECUTE; 448 } 449 450 /* A zero-byte op is not required to set an addr or rkey. */ 451 if ((pkt->mask & (RXE_READ_MASK | RXE_WRITE_OR_SEND)) && 452 (pkt->mask & RXE_RETH_MASK) && 453 reth_len(pkt) == 0) { 454 return RESPST_EXECUTE; 455 } 456 457 va = qp->resp.va; 458 rkey = qp->resp.rkey; 459 resid = qp->resp.resid; 460 pktlen = payload_size(pkt); 461 462 mem = lookup_mem(qp->pd, access, rkey, lookup_remote); 463 if (!mem) { 464 state = RESPST_ERR_RKEY_VIOLATION; 465 goto err; 466 } 467 468 if (unlikely(mem->state == RXE_MEM_STATE_FREE)) { 469 state = RESPST_ERR_RKEY_VIOLATION; 470 goto err; 471 } 472 473 if (mem_check_range(mem, va, resid)) { 474 state = RESPST_ERR_RKEY_VIOLATION; 475 goto err; 476 } 477 478 if (pkt->mask & RXE_WRITE_MASK) { 479 if (resid > mtu) { 480 if (pktlen != mtu || bth_pad(pkt)) { 481 state = RESPST_ERR_LENGTH; 482 goto err; 483 } 484 } else { 485 if (pktlen != resid) { 486 state = RESPST_ERR_LENGTH; 487 goto err; 488 } 489 if ((bth_pad(pkt) != (0x3 & (-resid)))) { 490 /* This case may not be exactly that 491 * but nothing else fits. 492 */ 493 state = RESPST_ERR_LENGTH; 494 goto err; 495 } 496 } 497 } 498 499 WARN_ON_ONCE(qp->resp.mr); 500 501 qp->resp.mr = mem; 502 return RESPST_EXECUTE; 503 504 err: 505 if (mem) 506 rxe_drop_ref(mem); 507 return state; 508 } 509 510 static enum resp_states send_data_in(struct rxe_qp *qp, void *data_addr, 511 int data_len) 512 { 513 int err; 514 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 515 516 err = copy_data(rxe, qp->pd, IB_ACCESS_LOCAL_WRITE, &qp->resp.wqe->dma, 517 data_addr, data_len, to_mem_obj, NULL); 518 if (unlikely(err)) 519 return (err == -ENOSPC) ? RESPST_ERR_LENGTH 520 : RESPST_ERR_MALFORMED_WQE; 521 522 return RESPST_NONE; 523 } 524 525 static enum resp_states write_data_in(struct rxe_qp *qp, 526 struct rxe_pkt_info *pkt) 527 { 528 enum resp_states rc = RESPST_NONE; 529 int err; 530 int data_len = payload_size(pkt); 531 532 err = rxe_mem_copy(qp->resp.mr, qp->resp.va, payload_addr(pkt), 533 data_len, to_mem_obj, NULL); 534 if (err) { 535 rc = RESPST_ERR_RKEY_VIOLATION; 536 goto out; 537 } 538 539 qp->resp.va += data_len; 540 qp->resp.resid -= data_len; 541 542 out: 543 return rc; 544 } 545 546 /* Guarantee atomicity of atomic operations at the machine level. */ 547 static DEFINE_SPINLOCK(atomic_ops_lock); 548 549 static enum resp_states process_atomic(struct rxe_qp *qp, 550 struct rxe_pkt_info *pkt) 551 { 552 u64 iova = atmeth_va(pkt); 553 u64 *vaddr; 554 enum resp_states ret; 555 struct rxe_mem *mr = qp->resp.mr; 556 557 if (mr->state != RXE_MEM_STATE_VALID) { 558 ret = RESPST_ERR_RKEY_VIOLATION; 559 goto out; 560 } 561 562 vaddr = iova_to_vaddr(mr, iova, sizeof(u64)); 563 564 /* check vaddr is 8 bytes aligned. */ 565 if (!vaddr || (uintptr_t)vaddr & 7) { 566 ret = RESPST_ERR_MISALIGNED_ATOMIC; 567 goto out; 568 } 569 570 spin_lock_bh(&atomic_ops_lock); 571 572 qp->resp.atomic_orig = *vaddr; 573 574 if (pkt->opcode == IB_OPCODE_RC_COMPARE_SWAP || 575 pkt->opcode == IB_OPCODE_RD_COMPARE_SWAP) { 576 if (*vaddr == atmeth_comp(pkt)) 577 *vaddr = atmeth_swap_add(pkt); 578 } else { 579 *vaddr += atmeth_swap_add(pkt); 580 } 581 582 spin_unlock_bh(&atomic_ops_lock); 583 584 ret = RESPST_NONE; 585 out: 586 return ret; 587 } 588 589 static struct sk_buff *prepare_ack_packet(struct rxe_qp *qp, 590 struct rxe_pkt_info *pkt, 591 struct rxe_pkt_info *ack, 592 int opcode, 593 int payload, 594 u32 psn, 595 u8 syndrome, 596 u32 *crcp) 597 { 598 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 599 struct sk_buff *skb; 600 u32 crc = 0; 601 u32 *p; 602 int paylen; 603 int pad; 604 int err; 605 606 /* 607 * allocate packet 608 */ 609 pad = (-payload) & 0x3; 610 paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE; 611 612 skb = rxe_init_packet(rxe, &qp->pri_av, paylen, ack); 613 if (!skb) 614 return NULL; 615 616 ack->qp = qp; 617 ack->opcode = opcode; 618 ack->mask = rxe_opcode[opcode].mask; 619 ack->offset = pkt->offset; 620 ack->paylen = paylen; 621 622 /* fill in bth using the request packet headers */ 623 memcpy(ack->hdr, pkt->hdr, pkt->offset + RXE_BTH_BYTES); 624 625 bth_set_opcode(ack, opcode); 626 bth_set_qpn(ack, qp->attr.dest_qp_num); 627 bth_set_pad(ack, pad); 628 bth_set_se(ack, 0); 629 bth_set_psn(ack, psn); 630 bth_set_ack(ack, 0); 631 ack->psn = psn; 632 633 if (ack->mask & RXE_AETH_MASK) { 634 aeth_set_syn(ack, syndrome); 635 aeth_set_msn(ack, qp->resp.msn); 636 } 637 638 if (ack->mask & RXE_ATMACK_MASK) 639 atmack_set_orig(ack, qp->resp.atomic_orig); 640 641 err = rxe_prepare(rxe, ack, skb, &crc); 642 if (err) { 643 kfree_skb(skb); 644 return NULL; 645 } 646 647 if (crcp) { 648 /* CRC computation will be continued by the caller */ 649 *crcp = crc; 650 } else { 651 p = payload_addr(ack) + payload + bth_pad(ack); 652 *p = ~crc; 653 } 654 655 return skb; 656 } 657 658 /* RDMA read response. If res is not NULL, then we have a current RDMA request 659 * being processed or replayed. 660 */ 661 static enum resp_states read_reply(struct rxe_qp *qp, 662 struct rxe_pkt_info *req_pkt) 663 { 664 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 665 struct rxe_pkt_info ack_pkt; 666 struct sk_buff *skb; 667 int mtu = qp->mtu; 668 enum resp_states state; 669 int payload; 670 int opcode; 671 int err; 672 struct resp_res *res = qp->resp.res; 673 u32 icrc; 674 u32 *p; 675 676 if (!res) { 677 /* This is the first time we process that request. Get a 678 * resource 679 */ 680 res = &qp->resp.resources[qp->resp.res_head]; 681 682 free_rd_atomic_resource(qp, res); 683 rxe_advance_resp_resource(qp); 684 685 res->type = RXE_READ_MASK; 686 687 res->read.va = qp->resp.va; 688 res->read.va_org = qp->resp.va; 689 690 res->first_psn = req_pkt->psn; 691 692 if (reth_len(req_pkt)) { 693 res->last_psn = (req_pkt->psn + 694 (reth_len(req_pkt) + mtu - 1) / 695 mtu - 1) & BTH_PSN_MASK; 696 } else { 697 res->last_psn = res->first_psn; 698 } 699 res->cur_psn = req_pkt->psn; 700 701 res->read.resid = qp->resp.resid; 702 res->read.length = qp->resp.resid; 703 res->read.rkey = qp->resp.rkey; 704 705 /* note res inherits the reference to mr from qp */ 706 res->read.mr = qp->resp.mr; 707 qp->resp.mr = NULL; 708 709 qp->resp.res = res; 710 res->state = rdatm_res_state_new; 711 } 712 713 if (res->state == rdatm_res_state_new) { 714 if (res->read.resid <= mtu) 715 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_ONLY; 716 else 717 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST; 718 } else { 719 if (res->read.resid > mtu) 720 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE; 721 else 722 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_LAST; 723 } 724 725 res->state = rdatm_res_state_next; 726 727 payload = min_t(int, res->read.resid, mtu); 728 729 skb = prepare_ack_packet(qp, req_pkt, &ack_pkt, opcode, payload, 730 res->cur_psn, AETH_ACK_UNLIMITED, &icrc); 731 if (!skb) 732 return RESPST_ERR_RNR; 733 734 err = rxe_mem_copy(res->read.mr, res->read.va, payload_addr(&ack_pkt), 735 payload, from_mem_obj, &icrc); 736 if (err) 737 pr_err("Failed copying memory\n"); 738 739 p = payload_addr(&ack_pkt) + payload + bth_pad(&ack_pkt); 740 *p = ~icrc; 741 742 err = rxe_xmit_packet(rxe, qp, &ack_pkt, skb); 743 if (err) { 744 pr_err("Failed sending RDMA reply.\n"); 745 kfree_skb(skb); 746 return RESPST_ERR_RNR; 747 } 748 749 res->read.va += payload; 750 res->read.resid -= payload; 751 res->cur_psn = (res->cur_psn + 1) & BTH_PSN_MASK; 752 753 if (res->read.resid > 0) { 754 state = RESPST_DONE; 755 } else { 756 qp->resp.res = NULL; 757 qp->resp.opcode = -1; 758 if (psn_compare(res->cur_psn, qp->resp.psn) >= 0) 759 qp->resp.psn = res->cur_psn; 760 state = RESPST_CLEANUP; 761 } 762 763 return state; 764 } 765 766 static void build_rdma_network_hdr(union rdma_network_hdr *hdr, 767 struct rxe_pkt_info *pkt) 768 { 769 struct sk_buff *skb = PKT_TO_SKB(pkt); 770 771 memset(hdr, 0, sizeof(*hdr)); 772 if (skb->protocol == htons(ETH_P_IP)) 773 memcpy(&hdr->roce4grh, ip_hdr(skb), sizeof(hdr->roce4grh)); 774 else if (skb->protocol == htons(ETH_P_IPV6)) 775 memcpy(&hdr->ibgrh, ipv6_hdr(skb), sizeof(hdr->ibgrh)); 776 } 777 778 /* Executes a new request. A retried request never reach that function (send 779 * and writes are discarded, and reads and atomics are retried elsewhere. 780 */ 781 static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt) 782 { 783 enum resp_states err; 784 785 if (pkt->mask & RXE_SEND_MASK) { 786 if (qp_type(qp) == IB_QPT_UD || 787 qp_type(qp) == IB_QPT_SMI || 788 qp_type(qp) == IB_QPT_GSI) { 789 union rdma_network_hdr hdr; 790 791 build_rdma_network_hdr(&hdr, pkt); 792 793 err = send_data_in(qp, &hdr, sizeof(hdr)); 794 if (err) 795 return err; 796 } 797 err = send_data_in(qp, payload_addr(pkt), payload_size(pkt)); 798 if (err) 799 return err; 800 } else if (pkt->mask & RXE_WRITE_MASK) { 801 err = write_data_in(qp, pkt); 802 if (err) 803 return err; 804 } else if (pkt->mask & RXE_READ_MASK) { 805 /* For RDMA Read we can increment the msn now. See C9-148. */ 806 qp->resp.msn++; 807 return RESPST_READ_REPLY; 808 } else if (pkt->mask & RXE_ATOMIC_MASK) { 809 err = process_atomic(qp, pkt); 810 if (err) 811 return err; 812 } else { 813 /* Unreachable */ 814 WARN_ON_ONCE(1); 815 } 816 817 /* next expected psn, read handles this separately */ 818 qp->resp.psn = (pkt->psn + 1) & BTH_PSN_MASK; 819 820 qp->resp.opcode = pkt->opcode; 821 qp->resp.status = IB_WC_SUCCESS; 822 823 if (pkt->mask & RXE_COMP_MASK) { 824 /* We successfully processed this new request. */ 825 qp->resp.msn++; 826 return RESPST_COMPLETE; 827 } else if (qp_type(qp) == IB_QPT_RC) 828 return RESPST_ACKNOWLEDGE; 829 else 830 return RESPST_CLEANUP; 831 } 832 833 static enum resp_states do_complete(struct rxe_qp *qp, 834 struct rxe_pkt_info *pkt) 835 { 836 struct rxe_cqe cqe; 837 struct ib_wc *wc = &cqe.ibwc; 838 struct ib_uverbs_wc *uwc = &cqe.uibwc; 839 struct rxe_recv_wqe *wqe = qp->resp.wqe; 840 841 if (unlikely(!wqe)) 842 return RESPST_CLEANUP; 843 844 memset(&cqe, 0, sizeof(cqe)); 845 846 wc->wr_id = wqe->wr_id; 847 wc->status = qp->resp.status; 848 wc->qp = &qp->ibqp; 849 850 /* fields after status are not required for errors */ 851 if (wc->status == IB_WC_SUCCESS) { 852 wc->opcode = (pkt->mask & RXE_IMMDT_MASK && 853 pkt->mask & RXE_WRITE_MASK) ? 854 IB_WC_RECV_RDMA_WITH_IMM : IB_WC_RECV; 855 wc->vendor_err = 0; 856 wc->byte_len = wqe->dma.length - wqe->dma.resid; 857 858 /* fields after byte_len are different between kernel and user 859 * space 860 */ 861 if (qp->rcq->is_user) { 862 uwc->wc_flags = IB_WC_GRH; 863 864 if (pkt->mask & RXE_IMMDT_MASK) { 865 uwc->wc_flags |= IB_WC_WITH_IMM; 866 uwc->ex.imm_data = 867 (__u32 __force)immdt_imm(pkt); 868 } 869 870 if (pkt->mask & RXE_IETH_MASK) { 871 uwc->wc_flags |= IB_WC_WITH_INVALIDATE; 872 uwc->ex.invalidate_rkey = ieth_rkey(pkt); 873 } 874 875 uwc->qp_num = qp->ibqp.qp_num; 876 877 if (pkt->mask & RXE_DETH_MASK) 878 uwc->src_qp = deth_sqp(pkt); 879 880 uwc->port_num = qp->attr.port_num; 881 } else { 882 struct sk_buff *skb = PKT_TO_SKB(pkt); 883 884 wc->wc_flags = IB_WC_GRH | IB_WC_WITH_NETWORK_HDR_TYPE; 885 if (skb->protocol == htons(ETH_P_IP)) 886 wc->network_hdr_type = RDMA_NETWORK_IPV4; 887 else 888 wc->network_hdr_type = RDMA_NETWORK_IPV6; 889 890 if (pkt->mask & RXE_IMMDT_MASK) { 891 wc->wc_flags |= IB_WC_WITH_IMM; 892 wc->ex.imm_data = immdt_imm(pkt); 893 } 894 895 if (pkt->mask & RXE_IETH_MASK) { 896 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 897 struct rxe_mem *rmr; 898 899 wc->wc_flags |= IB_WC_WITH_INVALIDATE; 900 wc->ex.invalidate_rkey = ieth_rkey(pkt); 901 902 rmr = rxe_pool_get_index(&rxe->mr_pool, 903 wc->ex.invalidate_rkey >> 8); 904 if (unlikely(!rmr)) { 905 pr_err("Bad rkey %#x invalidation\n", 906 wc->ex.invalidate_rkey); 907 return RESPST_ERROR; 908 } 909 rmr->state = RXE_MEM_STATE_FREE; 910 rxe_drop_ref(rmr); 911 } 912 913 wc->qp = &qp->ibqp; 914 915 if (pkt->mask & RXE_DETH_MASK) 916 wc->src_qp = deth_sqp(pkt); 917 918 wc->port_num = qp->attr.port_num; 919 } 920 } 921 922 /* have copy for srq and reference for !srq */ 923 if (!qp->srq) 924 advance_consumer(qp->rq.queue); 925 926 qp->resp.wqe = NULL; 927 928 if (rxe_cq_post(qp->rcq, &cqe, pkt ? bth_se(pkt) : 1)) 929 return RESPST_ERR_CQ_OVERFLOW; 930 931 if (qp->resp.state == QP_STATE_ERROR) 932 return RESPST_CHK_RESOURCE; 933 934 if (!pkt) 935 return RESPST_DONE; 936 else if (qp_type(qp) == IB_QPT_RC) 937 return RESPST_ACKNOWLEDGE; 938 else 939 return RESPST_CLEANUP; 940 } 941 942 static int send_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt, 943 u8 syndrome, u32 psn) 944 { 945 int err = 0; 946 struct rxe_pkt_info ack_pkt; 947 struct sk_buff *skb; 948 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 949 950 skb = prepare_ack_packet(qp, pkt, &ack_pkt, IB_OPCODE_RC_ACKNOWLEDGE, 951 0, psn, syndrome, NULL); 952 if (!skb) { 953 err = -ENOMEM; 954 goto err1; 955 } 956 957 err = rxe_xmit_packet(rxe, qp, &ack_pkt, skb); 958 if (err) { 959 pr_err_ratelimited("Failed sending ack\n"); 960 kfree_skb(skb); 961 } 962 963 err1: 964 return err; 965 } 966 967 static int send_atomic_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt, 968 u8 syndrome) 969 { 970 int rc = 0; 971 struct rxe_pkt_info ack_pkt; 972 struct sk_buff *skb; 973 struct sk_buff *skb_copy; 974 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 975 struct resp_res *res; 976 977 skb = prepare_ack_packet(qp, pkt, &ack_pkt, 978 IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE, 0, pkt->psn, 979 syndrome, NULL); 980 if (!skb) { 981 rc = -ENOMEM; 982 goto out; 983 } 984 985 skb_copy = skb_clone(skb, GFP_ATOMIC); 986 if (skb_copy) 987 rxe_add_ref(qp); /* for the new SKB */ 988 else { 989 pr_warn("Could not clone atomic response\n"); 990 rc = -ENOMEM; 991 goto out; 992 } 993 994 res = &qp->resp.resources[qp->resp.res_head]; 995 free_rd_atomic_resource(qp, res); 996 rxe_advance_resp_resource(qp); 997 998 memcpy(SKB_TO_PKT(skb), &ack_pkt, sizeof(ack_pkt)); 999 memset((unsigned char *)SKB_TO_PKT(skb) + sizeof(ack_pkt), 0, 1000 sizeof(skb->cb) - sizeof(ack_pkt)); 1001 1002 res->type = RXE_ATOMIC_MASK; 1003 res->atomic.skb = skb; 1004 res->first_psn = ack_pkt.psn; 1005 res->last_psn = ack_pkt.psn; 1006 res->cur_psn = ack_pkt.psn; 1007 1008 rc = rxe_xmit_packet(rxe, qp, &ack_pkt, skb_copy); 1009 if (rc) { 1010 pr_err_ratelimited("Failed sending ack\n"); 1011 rxe_drop_ref(qp); 1012 kfree_skb(skb_copy); 1013 } 1014 1015 out: 1016 return rc; 1017 } 1018 1019 static enum resp_states acknowledge(struct rxe_qp *qp, 1020 struct rxe_pkt_info *pkt) 1021 { 1022 if (qp_type(qp) != IB_QPT_RC) 1023 return RESPST_CLEANUP; 1024 1025 if (qp->resp.aeth_syndrome != AETH_ACK_UNLIMITED) 1026 send_ack(qp, pkt, qp->resp.aeth_syndrome, pkt->psn); 1027 else if (pkt->mask & RXE_ATOMIC_MASK) 1028 send_atomic_ack(qp, pkt, AETH_ACK_UNLIMITED); 1029 else if (bth_ack(pkt)) 1030 send_ack(qp, pkt, AETH_ACK_UNLIMITED, pkt->psn); 1031 1032 return RESPST_CLEANUP; 1033 } 1034 1035 static enum resp_states cleanup(struct rxe_qp *qp, 1036 struct rxe_pkt_info *pkt) 1037 { 1038 struct sk_buff *skb; 1039 1040 if (pkt) { 1041 skb = skb_dequeue(&qp->req_pkts); 1042 rxe_drop_ref(qp); 1043 kfree_skb(skb); 1044 } 1045 1046 if (qp->resp.mr) { 1047 rxe_drop_ref(qp->resp.mr); 1048 qp->resp.mr = NULL; 1049 } 1050 1051 return RESPST_DONE; 1052 } 1053 1054 static struct resp_res *find_resource(struct rxe_qp *qp, u32 psn) 1055 { 1056 int i; 1057 1058 for (i = 0; i < qp->attr.max_dest_rd_atomic; i++) { 1059 struct resp_res *res = &qp->resp.resources[i]; 1060 1061 if (res->type == 0) 1062 continue; 1063 1064 if (psn_compare(psn, res->first_psn) >= 0 && 1065 psn_compare(psn, res->last_psn) <= 0) { 1066 return res; 1067 } 1068 } 1069 1070 return NULL; 1071 } 1072 1073 static enum resp_states duplicate_request(struct rxe_qp *qp, 1074 struct rxe_pkt_info *pkt) 1075 { 1076 enum resp_states rc; 1077 u32 prev_psn = (qp->resp.psn - 1) & BTH_PSN_MASK; 1078 1079 if (pkt->mask & RXE_SEND_MASK || 1080 pkt->mask & RXE_WRITE_MASK) { 1081 /* SEND. Ack again and cleanup. C9-105. */ 1082 if (bth_ack(pkt)) 1083 send_ack(qp, pkt, AETH_ACK_UNLIMITED, prev_psn); 1084 rc = RESPST_CLEANUP; 1085 goto out; 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 1121 /* Reset the resource, except length. */ 1122 res->read.va_org = iova; 1123 res->read.va = iova; 1124 res->read.resid = resid; 1125 1126 /* Replay the RDMA read reply. */ 1127 qp->resp.res = res; 1128 rc = RESPST_READ_REPLY; 1129 goto out; 1130 } 1131 } else { 1132 struct resp_res *res; 1133 1134 /* Find the operation in our list of responder resources. */ 1135 res = find_resource(qp, pkt->psn); 1136 if (res) { 1137 struct sk_buff *skb_copy; 1138 1139 skb_copy = skb_clone(res->atomic.skb, GFP_ATOMIC); 1140 if (skb_copy) { 1141 rxe_add_ref(qp); /* for the new SKB */ 1142 } else { 1143 pr_warn("Couldn't clone atomic resp\n"); 1144 rc = RESPST_CLEANUP; 1145 goto out; 1146 } 1147 1148 /* Resend the result. */ 1149 rc = rxe_xmit_packet(to_rdev(qp->ibqp.device), qp, 1150 pkt, skb_copy); 1151 if (rc) { 1152 pr_err("Failed resending result. This flow is not handled - skb ignored\n"); 1153 rxe_drop_ref(qp); 1154 kfree_skb(skb_copy); 1155 rc = RESPST_CLEANUP; 1156 goto out; 1157 } 1158 } 1159 1160 /* Resource not found. Class D error. Drop the request. */ 1161 rc = RESPST_CLEANUP; 1162 goto out; 1163 } 1164 out: 1165 return rc; 1166 } 1167 1168 /* Process a class A or C. Both are treated the same in this implementation. */ 1169 static void do_class_ac_error(struct rxe_qp *qp, u8 syndrome, 1170 enum ib_wc_status status) 1171 { 1172 qp->resp.aeth_syndrome = syndrome; 1173 qp->resp.status = status; 1174 1175 /* indicate that we should go through the ERROR state */ 1176 qp->resp.goto_error = 1; 1177 } 1178 1179 static enum resp_states do_class_d1e_error(struct rxe_qp *qp) 1180 { 1181 /* UC */ 1182 if (qp->srq) { 1183 /* Class E */ 1184 qp->resp.drop_msg = 1; 1185 if (qp->resp.wqe) { 1186 qp->resp.status = IB_WC_REM_INV_REQ_ERR; 1187 return RESPST_COMPLETE; 1188 } else { 1189 return RESPST_CLEANUP; 1190 } 1191 } else { 1192 /* Class D1. This packet may be the start of a 1193 * new message and could be valid. The previous 1194 * message is invalid and ignored. reset the 1195 * recv wr to its original state 1196 */ 1197 if (qp->resp.wqe) { 1198 qp->resp.wqe->dma.resid = qp->resp.wqe->dma.length; 1199 qp->resp.wqe->dma.cur_sge = 0; 1200 qp->resp.wqe->dma.sge_offset = 0; 1201 qp->resp.opcode = -1; 1202 } 1203 1204 if (qp->resp.mr) { 1205 rxe_drop_ref(qp->resp.mr); 1206 qp->resp.mr = NULL; 1207 } 1208 1209 return RESPST_CLEANUP; 1210 } 1211 } 1212 1213 void rxe_drain_req_pkts(struct rxe_qp *qp, bool notify) 1214 { 1215 struct sk_buff *skb; 1216 1217 while ((skb = skb_dequeue(&qp->req_pkts))) { 1218 rxe_drop_ref(qp); 1219 kfree_skb(skb); 1220 } 1221 1222 if (notify) 1223 return; 1224 1225 while (!qp->srq && qp->rq.queue && queue_head(qp->rq.queue)) 1226 advance_consumer(qp->rq.queue); 1227 } 1228 1229 int rxe_responder(void *arg) 1230 { 1231 struct rxe_qp *qp = (struct rxe_qp *)arg; 1232 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 1233 enum resp_states state; 1234 struct rxe_pkt_info *pkt = NULL; 1235 int ret = 0; 1236 1237 rxe_add_ref(qp); 1238 1239 qp->resp.aeth_syndrome = AETH_ACK_UNLIMITED; 1240 1241 if (!qp->valid) { 1242 ret = -EINVAL; 1243 goto done; 1244 } 1245 1246 switch (qp->resp.state) { 1247 case QP_STATE_RESET: 1248 state = RESPST_RESET; 1249 break; 1250 1251 default: 1252 state = RESPST_GET_REQ; 1253 break; 1254 } 1255 1256 while (1) { 1257 pr_debug("qp#%d state = %s\n", qp_num(qp), 1258 resp_state_name[state]); 1259 switch (state) { 1260 case RESPST_GET_REQ: 1261 state = get_req(qp, &pkt); 1262 break; 1263 case RESPST_CHK_PSN: 1264 state = check_psn(qp, pkt); 1265 break; 1266 case RESPST_CHK_OP_SEQ: 1267 state = check_op_seq(qp, pkt); 1268 break; 1269 case RESPST_CHK_OP_VALID: 1270 state = check_op_valid(qp, pkt); 1271 break; 1272 case RESPST_CHK_RESOURCE: 1273 state = check_resource(qp, pkt); 1274 break; 1275 case RESPST_CHK_LENGTH: 1276 state = check_length(qp, pkt); 1277 break; 1278 case RESPST_CHK_RKEY: 1279 state = check_rkey(qp, pkt); 1280 break; 1281 case RESPST_EXECUTE: 1282 state = execute(qp, pkt); 1283 break; 1284 case RESPST_COMPLETE: 1285 state = do_complete(qp, pkt); 1286 break; 1287 case RESPST_READ_REPLY: 1288 state = read_reply(qp, pkt); 1289 break; 1290 case RESPST_ACKNOWLEDGE: 1291 state = acknowledge(qp, pkt); 1292 break; 1293 case RESPST_CLEANUP: 1294 state = cleanup(qp, pkt); 1295 break; 1296 case RESPST_DUPLICATE_REQUEST: 1297 state = duplicate_request(qp, pkt); 1298 break; 1299 case RESPST_ERR_PSN_OUT_OF_SEQ: 1300 /* RC only - Class B. Drop packet. */ 1301 send_ack(qp, pkt, AETH_NAK_PSN_SEQ_ERROR, qp->resp.psn); 1302 state = RESPST_CLEANUP; 1303 break; 1304 1305 case RESPST_ERR_TOO_MANY_RDMA_ATM_REQ: 1306 case RESPST_ERR_MISSING_OPCODE_FIRST: 1307 case RESPST_ERR_MISSING_OPCODE_LAST_C: 1308 case RESPST_ERR_UNSUPPORTED_OPCODE: 1309 case RESPST_ERR_MISALIGNED_ATOMIC: 1310 /* RC Only - Class C. */ 1311 do_class_ac_error(qp, AETH_NAK_INVALID_REQ, 1312 IB_WC_REM_INV_REQ_ERR); 1313 state = RESPST_COMPLETE; 1314 break; 1315 1316 case RESPST_ERR_MISSING_OPCODE_LAST_D1E: 1317 state = do_class_d1e_error(qp); 1318 break; 1319 case RESPST_ERR_RNR: 1320 if (qp_type(qp) == IB_QPT_RC) { 1321 rxe_counter_inc(rxe, RXE_CNT_SND_RNR); 1322 /* RC - class B */ 1323 send_ack(qp, pkt, AETH_RNR_NAK | 1324 (~AETH_TYPE_MASK & 1325 qp->attr.min_rnr_timer), 1326 pkt->psn); 1327 } else { 1328 /* UD/UC - class D */ 1329 qp->resp.drop_msg = 1; 1330 } 1331 state = RESPST_CLEANUP; 1332 break; 1333 1334 case RESPST_ERR_RKEY_VIOLATION: 1335 if (qp_type(qp) == IB_QPT_RC) { 1336 /* Class C */ 1337 do_class_ac_error(qp, AETH_NAK_REM_ACC_ERR, 1338 IB_WC_REM_ACCESS_ERR); 1339 state = RESPST_COMPLETE; 1340 } else { 1341 qp->resp.drop_msg = 1; 1342 if (qp->srq) { 1343 /* UC/SRQ Class D */ 1344 qp->resp.status = IB_WC_REM_ACCESS_ERR; 1345 state = RESPST_COMPLETE; 1346 } else { 1347 /* UC/non-SRQ Class E. */ 1348 state = RESPST_CLEANUP; 1349 } 1350 } 1351 break; 1352 1353 case RESPST_ERR_LENGTH: 1354 if (qp_type(qp) == IB_QPT_RC) { 1355 /* Class C */ 1356 do_class_ac_error(qp, AETH_NAK_INVALID_REQ, 1357 IB_WC_REM_INV_REQ_ERR); 1358 state = RESPST_COMPLETE; 1359 } else if (qp->srq) { 1360 /* UC/UD - class E */ 1361 qp->resp.status = IB_WC_REM_INV_REQ_ERR; 1362 state = RESPST_COMPLETE; 1363 } else { 1364 /* UC/UD - class D */ 1365 qp->resp.drop_msg = 1; 1366 state = RESPST_CLEANUP; 1367 } 1368 break; 1369 1370 case RESPST_ERR_MALFORMED_WQE: 1371 /* All, Class A. */ 1372 do_class_ac_error(qp, AETH_NAK_REM_OP_ERR, 1373 IB_WC_LOC_QP_OP_ERR); 1374 state = RESPST_COMPLETE; 1375 break; 1376 1377 case RESPST_ERR_CQ_OVERFLOW: 1378 /* All - Class G */ 1379 state = RESPST_ERROR; 1380 break; 1381 1382 case RESPST_DONE: 1383 if (qp->resp.goto_error) { 1384 state = RESPST_ERROR; 1385 break; 1386 } 1387 1388 goto done; 1389 1390 case RESPST_EXIT: 1391 if (qp->resp.goto_error) { 1392 state = RESPST_ERROR; 1393 break; 1394 } 1395 1396 goto exit; 1397 1398 case RESPST_RESET: 1399 rxe_drain_req_pkts(qp, false); 1400 qp->resp.wqe = NULL; 1401 goto exit; 1402 1403 case RESPST_ERROR: 1404 qp->resp.goto_error = 0; 1405 pr_warn("qp#%d moved to error state\n", qp_num(qp)); 1406 rxe_qp_error(qp); 1407 goto exit; 1408 1409 default: 1410 WARN_ON_ONCE(1); 1411 } 1412 } 1413 1414 exit: 1415 ret = -EAGAIN; 1416 done: 1417 rxe_drop_ref(qp); 1418 return ret; 1419 } 1420