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 while ((skb = skb_dequeue(&qp->req_pkts))) { 128 rxe_drop_ref(qp); 129 kfree_skb(skb); 130 } 131 132 /* go drain recv wr queue */ 133 return RESPST_CHK_RESOURCE; 134 } 135 136 skb = skb_peek(&qp->req_pkts); 137 if (!skb) 138 return RESPST_EXIT; 139 140 *pkt_p = SKB_TO_PKT(skb); 141 142 return (qp->resp.res) ? RESPST_READ_REPLY : RESPST_CHK_PSN; 143 } 144 145 static enum resp_states check_psn(struct rxe_qp *qp, 146 struct rxe_pkt_info *pkt) 147 { 148 int diff = psn_compare(pkt->psn, qp->resp.psn); 149 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 150 151 switch (qp_type(qp)) { 152 case IB_QPT_RC: 153 if (diff > 0) { 154 if (qp->resp.sent_psn_nak) 155 return RESPST_CLEANUP; 156 157 qp->resp.sent_psn_nak = 1; 158 rxe_counter_inc(rxe, RXE_CNT_OUT_OF_SEQ_REQ); 159 return RESPST_ERR_PSN_OUT_OF_SEQ; 160 161 } else if (diff < 0) { 162 rxe_counter_inc(rxe, RXE_CNT_DUP_REQ); 163 return RESPST_DUPLICATE_REQUEST; 164 } 165 166 if (qp->resp.sent_psn_nak) 167 qp->resp.sent_psn_nak = 0; 168 169 break; 170 171 case IB_QPT_UC: 172 if (qp->resp.drop_msg || diff != 0) { 173 if (pkt->mask & RXE_START_MASK) { 174 qp->resp.drop_msg = 0; 175 return RESPST_CHK_OP_SEQ; 176 } 177 178 qp->resp.drop_msg = 1; 179 return RESPST_CLEANUP; 180 } 181 break; 182 default: 183 break; 184 } 185 186 return RESPST_CHK_OP_SEQ; 187 } 188 189 static enum resp_states check_op_seq(struct rxe_qp *qp, 190 struct rxe_pkt_info *pkt) 191 { 192 switch (qp_type(qp)) { 193 case IB_QPT_RC: 194 switch (qp->resp.opcode) { 195 case IB_OPCODE_RC_SEND_FIRST: 196 case IB_OPCODE_RC_SEND_MIDDLE: 197 switch (pkt->opcode) { 198 case IB_OPCODE_RC_SEND_MIDDLE: 199 case IB_OPCODE_RC_SEND_LAST: 200 case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE: 201 case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE: 202 return RESPST_CHK_OP_VALID; 203 default: 204 return RESPST_ERR_MISSING_OPCODE_LAST_C; 205 } 206 207 case IB_OPCODE_RC_RDMA_WRITE_FIRST: 208 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE: 209 switch (pkt->opcode) { 210 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE: 211 case IB_OPCODE_RC_RDMA_WRITE_LAST: 212 case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE: 213 return RESPST_CHK_OP_VALID; 214 default: 215 return RESPST_ERR_MISSING_OPCODE_LAST_C; 216 } 217 218 default: 219 switch (pkt->opcode) { 220 case IB_OPCODE_RC_SEND_MIDDLE: 221 case IB_OPCODE_RC_SEND_LAST: 222 case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE: 223 case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE: 224 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE: 225 case IB_OPCODE_RC_RDMA_WRITE_LAST: 226 case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE: 227 return RESPST_ERR_MISSING_OPCODE_FIRST; 228 default: 229 return RESPST_CHK_OP_VALID; 230 } 231 } 232 break; 233 234 case IB_QPT_UC: 235 switch (qp->resp.opcode) { 236 case IB_OPCODE_UC_SEND_FIRST: 237 case IB_OPCODE_UC_SEND_MIDDLE: 238 switch (pkt->opcode) { 239 case IB_OPCODE_UC_SEND_MIDDLE: 240 case IB_OPCODE_UC_SEND_LAST: 241 case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE: 242 return RESPST_CHK_OP_VALID; 243 default: 244 return RESPST_ERR_MISSING_OPCODE_LAST_D1E; 245 } 246 247 case IB_OPCODE_UC_RDMA_WRITE_FIRST: 248 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE: 249 switch (pkt->opcode) { 250 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE: 251 case IB_OPCODE_UC_RDMA_WRITE_LAST: 252 case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE: 253 return RESPST_CHK_OP_VALID; 254 default: 255 return RESPST_ERR_MISSING_OPCODE_LAST_D1E; 256 } 257 258 default: 259 switch (pkt->opcode) { 260 case IB_OPCODE_UC_SEND_MIDDLE: 261 case IB_OPCODE_UC_SEND_LAST: 262 case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE: 263 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE: 264 case IB_OPCODE_UC_RDMA_WRITE_LAST: 265 case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE: 266 qp->resp.drop_msg = 1; 267 return RESPST_CLEANUP; 268 default: 269 return RESPST_CHK_OP_VALID; 270 } 271 } 272 break; 273 274 default: 275 return RESPST_CHK_OP_VALID; 276 } 277 } 278 279 static enum resp_states check_op_valid(struct rxe_qp *qp, 280 struct rxe_pkt_info *pkt) 281 { 282 switch (qp_type(qp)) { 283 case IB_QPT_RC: 284 if (((pkt->mask & RXE_READ_MASK) && 285 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_READ)) || 286 ((pkt->mask & RXE_WRITE_MASK) && 287 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) || 288 ((pkt->mask & RXE_ATOMIC_MASK) && 289 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) { 290 return RESPST_ERR_UNSUPPORTED_OPCODE; 291 } 292 293 break; 294 295 case IB_QPT_UC: 296 if ((pkt->mask & RXE_WRITE_MASK) && 297 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) { 298 qp->resp.drop_msg = 1; 299 return RESPST_CLEANUP; 300 } 301 302 break; 303 304 case IB_QPT_UD: 305 case IB_QPT_SMI: 306 case IB_QPT_GSI: 307 break; 308 309 default: 310 WARN_ON_ONCE(1); 311 break; 312 } 313 314 return RESPST_CHK_RESOURCE; 315 } 316 317 static enum resp_states get_srq_wqe(struct rxe_qp *qp) 318 { 319 struct rxe_srq *srq = qp->srq; 320 struct rxe_queue *q = srq->rq.queue; 321 struct rxe_recv_wqe *wqe; 322 struct ib_event ev; 323 324 if (srq->error) 325 return RESPST_ERR_RNR; 326 327 spin_lock_bh(&srq->rq.consumer_lock); 328 329 wqe = queue_head(q); 330 if (!wqe) { 331 spin_unlock_bh(&srq->rq.consumer_lock); 332 return RESPST_ERR_RNR; 333 } 334 335 /* note kernel and user space recv wqes have same size */ 336 memcpy(&qp->resp.srq_wqe, wqe, sizeof(qp->resp.srq_wqe)); 337 338 qp->resp.wqe = &qp->resp.srq_wqe.wqe; 339 advance_consumer(q); 340 341 if (srq->limit && srq->ibsrq.event_handler && 342 (queue_count(q) < srq->limit)) { 343 srq->limit = 0; 344 goto event; 345 } 346 347 spin_unlock_bh(&srq->rq.consumer_lock); 348 return RESPST_CHK_LENGTH; 349 350 event: 351 spin_unlock_bh(&srq->rq.consumer_lock); 352 ev.device = qp->ibqp.device; 353 ev.element.srq = qp->ibqp.srq; 354 ev.event = IB_EVENT_SRQ_LIMIT_REACHED; 355 srq->ibsrq.event_handler(&ev, srq->ibsrq.srq_context); 356 return RESPST_CHK_LENGTH; 357 } 358 359 static enum resp_states check_resource(struct rxe_qp *qp, 360 struct rxe_pkt_info *pkt) 361 { 362 struct rxe_srq *srq = qp->srq; 363 364 if (qp->resp.state == QP_STATE_ERROR) { 365 if (qp->resp.wqe) { 366 qp->resp.status = IB_WC_WR_FLUSH_ERR; 367 return RESPST_COMPLETE; 368 } else if (!srq) { 369 qp->resp.wqe = queue_head(qp->rq.queue); 370 if (qp->resp.wqe) { 371 qp->resp.status = IB_WC_WR_FLUSH_ERR; 372 return RESPST_COMPLETE; 373 } else { 374 return RESPST_EXIT; 375 } 376 } else { 377 return RESPST_EXIT; 378 } 379 } 380 381 if (pkt->mask & RXE_READ_OR_ATOMIC) { 382 /* it is the requesters job to not send 383 * too many read/atomic ops, we just 384 * recycle the responder resource queue 385 */ 386 if (likely(qp->attr.max_dest_rd_atomic > 0)) 387 return RESPST_CHK_LENGTH; 388 else 389 return RESPST_ERR_TOO_MANY_RDMA_ATM_REQ; 390 } 391 392 if (pkt->mask & RXE_RWR_MASK) { 393 if (srq) 394 return get_srq_wqe(qp); 395 396 qp->resp.wqe = queue_head(qp->rq.queue); 397 return (qp->resp.wqe) ? RESPST_CHK_LENGTH : RESPST_ERR_RNR; 398 } 399 400 return RESPST_CHK_LENGTH; 401 } 402 403 static enum resp_states check_length(struct rxe_qp *qp, 404 struct rxe_pkt_info *pkt) 405 { 406 switch (qp_type(qp)) { 407 case IB_QPT_RC: 408 return RESPST_CHK_RKEY; 409 410 case IB_QPT_UC: 411 return RESPST_CHK_RKEY; 412 413 default: 414 return RESPST_CHK_RKEY; 415 } 416 } 417 418 static enum resp_states check_rkey(struct rxe_qp *qp, 419 struct rxe_pkt_info *pkt) 420 { 421 struct rxe_mem *mem = NULL; 422 u64 va; 423 u32 rkey; 424 u32 resid; 425 u32 pktlen; 426 int mtu = qp->mtu; 427 enum resp_states state; 428 int access; 429 430 if (pkt->mask & (RXE_READ_MASK | RXE_WRITE_MASK)) { 431 if (pkt->mask & RXE_RETH_MASK) { 432 qp->resp.va = reth_va(pkt); 433 qp->resp.rkey = reth_rkey(pkt); 434 qp->resp.resid = 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 p = payload_addr(&ack_pkt) + payload + bth_pad(&ack_pkt); 736 *p = ~icrc; 737 738 err = rxe_xmit_packet(qp, &ack_pkt, skb); 739 if (err) { 740 pr_err("Failed sending RDMA reply.\n"); 741 return RESPST_ERR_RNR; 742 } 743 744 res->read.va += payload; 745 res->read.resid -= payload; 746 res->cur_psn = (res->cur_psn + 1) & BTH_PSN_MASK; 747 748 if (res->read.resid > 0) { 749 state = RESPST_DONE; 750 } else { 751 qp->resp.res = NULL; 752 if (!res->replay) 753 qp->resp.opcode = -1; 754 if (psn_compare(res->cur_psn, qp->resp.psn) >= 0) 755 qp->resp.psn = res->cur_psn; 756 state = RESPST_CLEANUP; 757 } 758 759 return state; 760 } 761 762 static void build_rdma_network_hdr(union rdma_network_hdr *hdr, 763 struct rxe_pkt_info *pkt) 764 { 765 struct sk_buff *skb = PKT_TO_SKB(pkt); 766 767 memset(hdr, 0, sizeof(*hdr)); 768 if (skb->protocol == htons(ETH_P_IP)) 769 memcpy(&hdr->roce4grh, ip_hdr(skb), sizeof(hdr->roce4grh)); 770 else if (skb->protocol == htons(ETH_P_IPV6)) 771 memcpy(&hdr->ibgrh, ipv6_hdr(skb), sizeof(hdr->ibgrh)); 772 } 773 774 /* Executes a new request. A retried request never reach that function (send 775 * and writes are discarded, and reads and atomics are retried elsewhere. 776 */ 777 static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt) 778 { 779 enum resp_states err; 780 781 if (pkt->mask & RXE_SEND_MASK) { 782 if (qp_type(qp) == IB_QPT_UD || 783 qp_type(qp) == IB_QPT_SMI || 784 qp_type(qp) == IB_QPT_GSI) { 785 union rdma_network_hdr hdr; 786 787 build_rdma_network_hdr(&hdr, pkt); 788 789 err = send_data_in(qp, &hdr, sizeof(hdr)); 790 if (err) 791 return err; 792 } 793 err = send_data_in(qp, payload_addr(pkt), payload_size(pkt)); 794 if (err) 795 return err; 796 } else if (pkt->mask & RXE_WRITE_MASK) { 797 err = write_data_in(qp, pkt); 798 if (err) 799 return err; 800 } else if (pkt->mask & RXE_READ_MASK) { 801 /* For RDMA Read we can increment the msn now. See C9-148. */ 802 qp->resp.msn++; 803 return RESPST_READ_REPLY; 804 } else if (pkt->mask & RXE_ATOMIC_MASK) { 805 err = process_atomic(qp, pkt); 806 if (err) 807 return err; 808 } else { 809 /* Unreachable */ 810 WARN_ON_ONCE(1); 811 } 812 813 /* next expected psn, read handles this separately */ 814 qp->resp.psn = (pkt->psn + 1) & BTH_PSN_MASK; 815 qp->resp.ack_psn = qp->resp.psn; 816 817 qp->resp.opcode = pkt->opcode; 818 qp->resp.status = IB_WC_SUCCESS; 819 820 if (pkt->mask & RXE_COMP_MASK) { 821 /* We successfully processed this new request. */ 822 qp->resp.msn++; 823 return RESPST_COMPLETE; 824 } else if (qp_type(qp) == IB_QPT_RC) 825 return RESPST_ACKNOWLEDGE; 826 else 827 return RESPST_CLEANUP; 828 } 829 830 static enum resp_states do_complete(struct rxe_qp *qp, 831 struct rxe_pkt_info *pkt) 832 { 833 struct rxe_cqe cqe; 834 struct ib_wc *wc = &cqe.ibwc; 835 struct ib_uverbs_wc *uwc = &cqe.uibwc; 836 struct rxe_recv_wqe *wqe = qp->resp.wqe; 837 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 838 839 if (unlikely(!wqe)) 840 return RESPST_CLEANUP; 841 842 memset(&cqe, 0, sizeof(cqe)); 843 844 if (qp->rcq->is_user) { 845 uwc->status = qp->resp.status; 846 uwc->qp_num = qp->ibqp.qp_num; 847 uwc->wr_id = wqe->wr_id; 848 } else { 849 wc->status = qp->resp.status; 850 wc->qp = &qp->ibqp; 851 wc->wr_id = wqe->wr_id; 852 } 853 854 if (wc->status == IB_WC_SUCCESS) { 855 rxe_counter_inc(rxe, RXE_CNT_RDMA_RECV); 856 wc->opcode = (pkt->mask & RXE_IMMDT_MASK && 857 pkt->mask & RXE_WRITE_MASK) ? 858 IB_WC_RECV_RDMA_WITH_IMM : IB_WC_RECV; 859 wc->vendor_err = 0; 860 wc->byte_len = wqe->dma.length - wqe->dma.resid; 861 862 /* fields after byte_len are different between kernel and user 863 * space 864 */ 865 if (qp->rcq->is_user) { 866 uwc->wc_flags = IB_WC_GRH; 867 868 if (pkt->mask & RXE_IMMDT_MASK) { 869 uwc->wc_flags |= IB_WC_WITH_IMM; 870 uwc->ex.imm_data = immdt_imm(pkt); 871 } 872 873 if (pkt->mask & RXE_IETH_MASK) { 874 uwc->wc_flags |= IB_WC_WITH_INVALIDATE; 875 uwc->ex.invalidate_rkey = ieth_rkey(pkt); 876 } 877 878 uwc->qp_num = qp->ibqp.qp_num; 879 880 if (pkt->mask & RXE_DETH_MASK) 881 uwc->src_qp = deth_sqp(pkt); 882 883 uwc->port_num = qp->attr.port_num; 884 } else { 885 struct sk_buff *skb = PKT_TO_SKB(pkt); 886 887 wc->wc_flags = IB_WC_GRH | IB_WC_WITH_NETWORK_HDR_TYPE; 888 if (skb->protocol == htons(ETH_P_IP)) 889 wc->network_hdr_type = RDMA_NETWORK_IPV4; 890 else 891 wc->network_hdr_type = RDMA_NETWORK_IPV6; 892 893 if (is_vlan_dev(skb->dev)) { 894 wc->wc_flags |= IB_WC_WITH_VLAN; 895 wc->vlan_id = vlan_dev_vlan_id(skb->dev); 896 } 897 898 if (pkt->mask & RXE_IMMDT_MASK) { 899 wc->wc_flags |= IB_WC_WITH_IMM; 900 wc->ex.imm_data = immdt_imm(pkt); 901 } 902 903 if (pkt->mask & RXE_IETH_MASK) { 904 struct rxe_mem *rmr; 905 906 wc->wc_flags |= IB_WC_WITH_INVALIDATE; 907 wc->ex.invalidate_rkey = ieth_rkey(pkt); 908 909 rmr = rxe_pool_get_index(&rxe->mr_pool, 910 wc->ex.invalidate_rkey >> 8); 911 if (unlikely(!rmr)) { 912 pr_err("Bad rkey %#x invalidation\n", 913 wc->ex.invalidate_rkey); 914 return RESPST_ERROR; 915 } 916 rmr->state = RXE_MEM_STATE_FREE; 917 rxe_drop_ref(rmr); 918 } 919 920 wc->qp = &qp->ibqp; 921 922 if (pkt->mask & RXE_DETH_MASK) 923 wc->src_qp = deth_sqp(pkt); 924 925 wc->port_num = qp->attr.port_num; 926 } 927 } 928 929 /* have copy for srq and reference for !srq */ 930 if (!qp->srq) 931 advance_consumer(qp->rq.queue); 932 933 qp->resp.wqe = NULL; 934 935 if (rxe_cq_post(qp->rcq, &cqe, pkt ? bth_se(pkt) : 1)) 936 return RESPST_ERR_CQ_OVERFLOW; 937 938 if (qp->resp.state == QP_STATE_ERROR) 939 return RESPST_CHK_RESOURCE; 940 941 if (!pkt) 942 return RESPST_DONE; 943 else if (qp_type(qp) == IB_QPT_RC) 944 return RESPST_ACKNOWLEDGE; 945 else 946 return RESPST_CLEANUP; 947 } 948 949 static int send_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt, 950 u8 syndrome, u32 psn) 951 { 952 int err = 0; 953 struct rxe_pkt_info ack_pkt; 954 struct sk_buff *skb; 955 956 skb = prepare_ack_packet(qp, pkt, &ack_pkt, IB_OPCODE_RC_ACKNOWLEDGE, 957 0, psn, syndrome, NULL); 958 if (!skb) { 959 err = -ENOMEM; 960 goto err1; 961 } 962 963 err = rxe_xmit_packet(qp, &ack_pkt, skb); 964 if (err) 965 pr_err_ratelimited("Failed sending ack\n"); 966 967 err1: 968 return err; 969 } 970 971 static int send_atomic_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt, 972 u8 syndrome) 973 { 974 int rc = 0; 975 struct rxe_pkt_info ack_pkt; 976 struct sk_buff *skb; 977 struct resp_res *res; 978 979 skb = prepare_ack_packet(qp, pkt, &ack_pkt, 980 IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE, 0, pkt->psn, 981 syndrome, NULL); 982 if (!skb) { 983 rc = -ENOMEM; 984 goto out; 985 } 986 987 rxe_add_ref(qp); 988 989 res = &qp->resp.resources[qp->resp.res_head]; 990 free_rd_atomic_resource(qp, res); 991 rxe_advance_resp_resource(qp); 992 993 memcpy(SKB_TO_PKT(skb), &ack_pkt, sizeof(ack_pkt)); 994 memset((unsigned char *)SKB_TO_PKT(skb) + sizeof(ack_pkt), 0, 995 sizeof(skb->cb) - sizeof(ack_pkt)); 996 997 skb_get(skb); 998 res->type = RXE_ATOMIC_MASK; 999 res->atomic.skb = skb; 1000 res->first_psn = ack_pkt.psn; 1001 res->last_psn = ack_pkt.psn; 1002 res->cur_psn = ack_pkt.psn; 1003 1004 rc = rxe_xmit_packet(qp, &ack_pkt, skb); 1005 if (rc) { 1006 pr_err_ratelimited("Failed sending ack\n"); 1007 rxe_drop_ref(qp); 1008 } 1009 out: 1010 return rc; 1011 } 1012 1013 static enum resp_states acknowledge(struct rxe_qp *qp, 1014 struct rxe_pkt_info *pkt) 1015 { 1016 if (qp_type(qp) != IB_QPT_RC) 1017 return RESPST_CLEANUP; 1018 1019 if (qp->resp.aeth_syndrome != AETH_ACK_UNLIMITED) 1020 send_ack(qp, pkt, qp->resp.aeth_syndrome, pkt->psn); 1021 else if (pkt->mask & RXE_ATOMIC_MASK) 1022 send_atomic_ack(qp, pkt, AETH_ACK_UNLIMITED); 1023 else if (bth_ack(pkt)) 1024 send_ack(qp, pkt, AETH_ACK_UNLIMITED, pkt->psn); 1025 1026 return RESPST_CLEANUP; 1027 } 1028 1029 static enum resp_states cleanup(struct rxe_qp *qp, 1030 struct rxe_pkt_info *pkt) 1031 { 1032 struct sk_buff *skb; 1033 1034 if (pkt) { 1035 skb = skb_dequeue(&qp->req_pkts); 1036 rxe_drop_ref(qp); 1037 kfree_skb(skb); 1038 } 1039 1040 if (qp->resp.mr) { 1041 rxe_drop_ref(qp->resp.mr); 1042 qp->resp.mr = NULL; 1043 } 1044 1045 return RESPST_DONE; 1046 } 1047 1048 static struct resp_res *find_resource(struct rxe_qp *qp, u32 psn) 1049 { 1050 int i; 1051 1052 for (i = 0; i < qp->attr.max_dest_rd_atomic; i++) { 1053 struct resp_res *res = &qp->resp.resources[i]; 1054 1055 if (res->type == 0) 1056 continue; 1057 1058 if (psn_compare(psn, res->first_psn) >= 0 && 1059 psn_compare(psn, res->last_psn) <= 0) { 1060 return res; 1061 } 1062 } 1063 1064 return NULL; 1065 } 1066 1067 static enum resp_states duplicate_request(struct rxe_qp *qp, 1068 struct rxe_pkt_info *pkt) 1069 { 1070 enum resp_states rc; 1071 u32 prev_psn = (qp->resp.ack_psn - 1) & BTH_PSN_MASK; 1072 1073 if (pkt->mask & RXE_SEND_MASK || 1074 pkt->mask & RXE_WRITE_MASK) { 1075 /* SEND. Ack again and cleanup. C9-105. */ 1076 if (bth_ack(pkt)) 1077 send_ack(qp, pkt, AETH_ACK_UNLIMITED, prev_psn); 1078 rc = RESPST_CLEANUP; 1079 goto out; 1080 } else if (pkt->mask & RXE_READ_MASK) { 1081 struct resp_res *res; 1082 1083 res = find_resource(qp, pkt->psn); 1084 if (!res) { 1085 /* Resource not found. Class D error. Drop the 1086 * request. 1087 */ 1088 rc = RESPST_CLEANUP; 1089 goto out; 1090 } else { 1091 /* Ensure this new request is the same as the previous 1092 * one or a subset of it. 1093 */ 1094 u64 iova = reth_va(pkt); 1095 u32 resid = reth_len(pkt); 1096 1097 if (iova < res->read.va_org || 1098 resid > res->read.length || 1099 (iova + resid) > (res->read.va_org + 1100 res->read.length)) { 1101 rc = RESPST_CLEANUP; 1102 goto out; 1103 } 1104 1105 if (reth_rkey(pkt) != res->read.rkey) { 1106 rc = RESPST_CLEANUP; 1107 goto out; 1108 } 1109 1110 res->cur_psn = pkt->psn; 1111 res->state = (pkt->psn == res->first_psn) ? 1112 rdatm_res_state_new : 1113 rdatm_res_state_replay; 1114 res->replay = 1; 1115 1116 /* Reset the resource, except length. */ 1117 res->read.va_org = iova; 1118 res->read.va = iova; 1119 res->read.resid = resid; 1120 1121 /* Replay the RDMA read reply. */ 1122 qp->resp.res = res; 1123 rc = RESPST_READ_REPLY; 1124 goto out; 1125 } 1126 } else { 1127 struct resp_res *res; 1128 1129 /* Find the operation in our list of responder resources. */ 1130 res = find_resource(qp, pkt->psn); 1131 if (res) { 1132 skb_get(res->atomic.skb); 1133 /* Resend the result. */ 1134 rc = rxe_xmit_packet(qp, pkt, res->atomic.skb); 1135 if (rc) { 1136 pr_err("Failed resending result. This flow is not handled - skb ignored\n"); 1137 rc = RESPST_CLEANUP; 1138 goto out; 1139 } 1140 } 1141 1142 /* Resource not found. Class D error. Drop the request. */ 1143 rc = RESPST_CLEANUP; 1144 goto out; 1145 } 1146 out: 1147 return rc; 1148 } 1149 1150 /* Process a class A or C. Both are treated the same in this implementation. */ 1151 static void do_class_ac_error(struct rxe_qp *qp, u8 syndrome, 1152 enum ib_wc_status status) 1153 { 1154 qp->resp.aeth_syndrome = syndrome; 1155 qp->resp.status = status; 1156 1157 /* indicate that we should go through the ERROR state */ 1158 qp->resp.goto_error = 1; 1159 } 1160 1161 static enum resp_states do_class_d1e_error(struct rxe_qp *qp) 1162 { 1163 /* UC */ 1164 if (qp->srq) { 1165 /* Class E */ 1166 qp->resp.drop_msg = 1; 1167 if (qp->resp.wqe) { 1168 qp->resp.status = IB_WC_REM_INV_REQ_ERR; 1169 return RESPST_COMPLETE; 1170 } else { 1171 return RESPST_CLEANUP; 1172 } 1173 } else { 1174 /* Class D1. This packet may be the start of a 1175 * new message and could be valid. The previous 1176 * message is invalid and ignored. reset the 1177 * recv wr to its original state 1178 */ 1179 if (qp->resp.wqe) { 1180 qp->resp.wqe->dma.resid = qp->resp.wqe->dma.length; 1181 qp->resp.wqe->dma.cur_sge = 0; 1182 qp->resp.wqe->dma.sge_offset = 0; 1183 qp->resp.opcode = -1; 1184 } 1185 1186 if (qp->resp.mr) { 1187 rxe_drop_ref(qp->resp.mr); 1188 qp->resp.mr = NULL; 1189 } 1190 1191 return RESPST_CLEANUP; 1192 } 1193 } 1194 1195 static void rxe_drain_req_pkts(struct rxe_qp *qp, bool notify) 1196 { 1197 struct sk_buff *skb; 1198 1199 while ((skb = skb_dequeue(&qp->req_pkts))) { 1200 rxe_drop_ref(qp); 1201 kfree_skb(skb); 1202 } 1203 1204 if (notify) 1205 return; 1206 1207 while (!qp->srq && qp->rq.queue && queue_head(qp->rq.queue)) 1208 advance_consumer(qp->rq.queue); 1209 } 1210 1211 int rxe_responder(void *arg) 1212 { 1213 struct rxe_qp *qp = (struct rxe_qp *)arg; 1214 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 1215 enum resp_states state; 1216 struct rxe_pkt_info *pkt = NULL; 1217 int ret = 0; 1218 1219 rxe_add_ref(qp); 1220 1221 qp->resp.aeth_syndrome = AETH_ACK_UNLIMITED; 1222 1223 if (!qp->valid) { 1224 ret = -EINVAL; 1225 goto done; 1226 } 1227 1228 switch (qp->resp.state) { 1229 case QP_STATE_RESET: 1230 state = RESPST_RESET; 1231 break; 1232 1233 default: 1234 state = RESPST_GET_REQ; 1235 break; 1236 } 1237 1238 while (1) { 1239 pr_debug("qp#%d state = %s\n", qp_num(qp), 1240 resp_state_name[state]); 1241 switch (state) { 1242 case RESPST_GET_REQ: 1243 state = get_req(qp, &pkt); 1244 break; 1245 case RESPST_CHK_PSN: 1246 state = check_psn(qp, pkt); 1247 break; 1248 case RESPST_CHK_OP_SEQ: 1249 state = check_op_seq(qp, pkt); 1250 break; 1251 case RESPST_CHK_OP_VALID: 1252 state = check_op_valid(qp, pkt); 1253 break; 1254 case RESPST_CHK_RESOURCE: 1255 state = check_resource(qp, pkt); 1256 break; 1257 case RESPST_CHK_LENGTH: 1258 state = check_length(qp, pkt); 1259 break; 1260 case RESPST_CHK_RKEY: 1261 state = check_rkey(qp, pkt); 1262 break; 1263 case RESPST_EXECUTE: 1264 state = execute(qp, pkt); 1265 break; 1266 case RESPST_COMPLETE: 1267 state = do_complete(qp, pkt); 1268 break; 1269 case RESPST_READ_REPLY: 1270 state = read_reply(qp, pkt); 1271 break; 1272 case RESPST_ACKNOWLEDGE: 1273 state = acknowledge(qp, pkt); 1274 break; 1275 case RESPST_CLEANUP: 1276 state = cleanup(qp, pkt); 1277 break; 1278 case RESPST_DUPLICATE_REQUEST: 1279 state = duplicate_request(qp, pkt); 1280 break; 1281 case RESPST_ERR_PSN_OUT_OF_SEQ: 1282 /* RC only - Class B. Drop packet. */ 1283 send_ack(qp, pkt, AETH_NAK_PSN_SEQ_ERROR, qp->resp.psn); 1284 state = RESPST_CLEANUP; 1285 break; 1286 1287 case RESPST_ERR_TOO_MANY_RDMA_ATM_REQ: 1288 case RESPST_ERR_MISSING_OPCODE_FIRST: 1289 case RESPST_ERR_MISSING_OPCODE_LAST_C: 1290 case RESPST_ERR_UNSUPPORTED_OPCODE: 1291 case RESPST_ERR_MISALIGNED_ATOMIC: 1292 /* RC Only - Class C. */ 1293 do_class_ac_error(qp, AETH_NAK_INVALID_REQ, 1294 IB_WC_REM_INV_REQ_ERR); 1295 state = RESPST_COMPLETE; 1296 break; 1297 1298 case RESPST_ERR_MISSING_OPCODE_LAST_D1E: 1299 state = do_class_d1e_error(qp); 1300 break; 1301 case RESPST_ERR_RNR: 1302 if (qp_type(qp) == IB_QPT_RC) { 1303 rxe_counter_inc(rxe, RXE_CNT_SND_RNR); 1304 /* RC - class B */ 1305 send_ack(qp, pkt, AETH_RNR_NAK | 1306 (~AETH_TYPE_MASK & 1307 qp->attr.min_rnr_timer), 1308 pkt->psn); 1309 } else { 1310 /* UD/UC - class D */ 1311 qp->resp.drop_msg = 1; 1312 } 1313 state = RESPST_CLEANUP; 1314 break; 1315 1316 case RESPST_ERR_RKEY_VIOLATION: 1317 if (qp_type(qp) == IB_QPT_RC) { 1318 /* Class C */ 1319 do_class_ac_error(qp, AETH_NAK_REM_ACC_ERR, 1320 IB_WC_REM_ACCESS_ERR); 1321 state = RESPST_COMPLETE; 1322 } else { 1323 qp->resp.drop_msg = 1; 1324 if (qp->srq) { 1325 /* UC/SRQ Class D */ 1326 qp->resp.status = IB_WC_REM_ACCESS_ERR; 1327 state = RESPST_COMPLETE; 1328 } else { 1329 /* UC/non-SRQ Class E. */ 1330 state = RESPST_CLEANUP; 1331 } 1332 } 1333 break; 1334 1335 case RESPST_ERR_LENGTH: 1336 if (qp_type(qp) == IB_QPT_RC) { 1337 /* Class C */ 1338 do_class_ac_error(qp, AETH_NAK_INVALID_REQ, 1339 IB_WC_REM_INV_REQ_ERR); 1340 state = RESPST_COMPLETE; 1341 } else if (qp->srq) { 1342 /* UC/UD - class E */ 1343 qp->resp.status = IB_WC_REM_INV_REQ_ERR; 1344 state = RESPST_COMPLETE; 1345 } else { 1346 /* UC/UD - class D */ 1347 qp->resp.drop_msg = 1; 1348 state = RESPST_CLEANUP; 1349 } 1350 break; 1351 1352 case RESPST_ERR_MALFORMED_WQE: 1353 /* All, Class A. */ 1354 do_class_ac_error(qp, AETH_NAK_REM_OP_ERR, 1355 IB_WC_LOC_QP_OP_ERR); 1356 state = RESPST_COMPLETE; 1357 break; 1358 1359 case RESPST_ERR_CQ_OVERFLOW: 1360 /* All - Class G */ 1361 state = RESPST_ERROR; 1362 break; 1363 1364 case RESPST_DONE: 1365 if (qp->resp.goto_error) { 1366 state = RESPST_ERROR; 1367 break; 1368 } 1369 1370 goto done; 1371 1372 case RESPST_EXIT: 1373 if (qp->resp.goto_error) { 1374 state = RESPST_ERROR; 1375 break; 1376 } 1377 1378 goto exit; 1379 1380 case RESPST_RESET: 1381 rxe_drain_req_pkts(qp, false); 1382 qp->resp.wqe = NULL; 1383 goto exit; 1384 1385 case RESPST_ERROR: 1386 qp->resp.goto_error = 0; 1387 pr_warn("qp#%d moved to error state\n", qp_num(qp)); 1388 rxe_qp_error(qp); 1389 goto exit; 1390 1391 default: 1392 WARN_ON_ONCE(1); 1393 } 1394 } 1395 1396 exit: 1397 ret = -EAGAIN; 1398 done: 1399 rxe_drop_ref(qp); 1400 return ret; 1401 } 1402