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 } 435 access = (pkt->mask & RXE_READ_MASK) ? IB_ACCESS_REMOTE_READ 436 : IB_ACCESS_REMOTE_WRITE; 437 } else if (pkt->mask & RXE_ATOMIC_MASK) { 438 qp->resp.va = atmeth_va(pkt); 439 qp->resp.rkey = atmeth_rkey(pkt); 440 qp->resp.resid = sizeof(u64); 441 access = IB_ACCESS_REMOTE_ATOMIC; 442 } else { 443 return RESPST_EXECUTE; 444 } 445 446 /* A zero-byte op is not required to set an addr or rkey. */ 447 if ((pkt->mask & (RXE_READ_MASK | RXE_WRITE_OR_SEND)) && 448 (pkt->mask & RXE_RETH_MASK) && 449 reth_len(pkt) == 0) { 450 return RESPST_EXECUTE; 451 } 452 453 va = qp->resp.va; 454 rkey = qp->resp.rkey; 455 resid = qp->resp.resid; 456 pktlen = payload_size(pkt); 457 458 mem = lookup_mem(qp->pd, access, rkey, lookup_remote); 459 if (!mem) { 460 state = RESPST_ERR_RKEY_VIOLATION; 461 goto err; 462 } 463 464 if (unlikely(mem->state == RXE_MEM_STATE_FREE)) { 465 state = RESPST_ERR_RKEY_VIOLATION; 466 goto err; 467 } 468 469 if (mem_check_range(mem, va, resid)) { 470 state = RESPST_ERR_RKEY_VIOLATION; 471 goto err; 472 } 473 474 if (pkt->mask & RXE_WRITE_MASK) { 475 if (resid > mtu) { 476 if (pktlen != mtu || bth_pad(pkt)) { 477 state = RESPST_ERR_LENGTH; 478 goto err; 479 } 480 } else { 481 if (pktlen != resid) { 482 state = RESPST_ERR_LENGTH; 483 goto err; 484 } 485 if ((bth_pad(pkt) != (0x3 & (-resid)))) { 486 /* This case may not be exactly that 487 * but nothing else fits. 488 */ 489 state = RESPST_ERR_LENGTH; 490 goto err; 491 } 492 } 493 } 494 495 WARN_ON_ONCE(qp->resp.mr); 496 497 qp->resp.mr = mem; 498 return RESPST_EXECUTE; 499 500 err: 501 if (mem) 502 rxe_drop_ref(mem); 503 return state; 504 } 505 506 static enum resp_states send_data_in(struct rxe_qp *qp, void *data_addr, 507 int data_len) 508 { 509 int err; 510 511 err = copy_data(qp->pd, IB_ACCESS_LOCAL_WRITE, &qp->resp.wqe->dma, 512 data_addr, data_len, to_mem_obj, NULL); 513 if (unlikely(err)) 514 return (err == -ENOSPC) ? RESPST_ERR_LENGTH 515 : RESPST_ERR_MALFORMED_WQE; 516 517 return RESPST_NONE; 518 } 519 520 static enum resp_states write_data_in(struct rxe_qp *qp, 521 struct rxe_pkt_info *pkt) 522 { 523 enum resp_states rc = RESPST_NONE; 524 int err; 525 int data_len = payload_size(pkt); 526 527 err = rxe_mem_copy(qp->resp.mr, qp->resp.va, payload_addr(pkt), 528 data_len, to_mem_obj, NULL); 529 if (err) { 530 rc = RESPST_ERR_RKEY_VIOLATION; 531 goto out; 532 } 533 534 qp->resp.va += data_len; 535 qp->resp.resid -= data_len; 536 537 out: 538 return rc; 539 } 540 541 /* Guarantee atomicity of atomic operations at the machine level. */ 542 static DEFINE_SPINLOCK(atomic_ops_lock); 543 544 static enum resp_states process_atomic(struct rxe_qp *qp, 545 struct rxe_pkt_info *pkt) 546 { 547 u64 iova = atmeth_va(pkt); 548 u64 *vaddr; 549 enum resp_states ret; 550 struct rxe_mem *mr = qp->resp.mr; 551 552 if (mr->state != RXE_MEM_STATE_VALID) { 553 ret = RESPST_ERR_RKEY_VIOLATION; 554 goto out; 555 } 556 557 vaddr = iova_to_vaddr(mr, iova, sizeof(u64)); 558 559 /* check vaddr is 8 bytes aligned. */ 560 if (!vaddr || (uintptr_t)vaddr & 7) { 561 ret = RESPST_ERR_MISALIGNED_ATOMIC; 562 goto out; 563 } 564 565 spin_lock_bh(&atomic_ops_lock); 566 567 qp->resp.atomic_orig = *vaddr; 568 569 if (pkt->opcode == IB_OPCODE_RC_COMPARE_SWAP || 570 pkt->opcode == IB_OPCODE_RD_COMPARE_SWAP) { 571 if (*vaddr == atmeth_comp(pkt)) 572 *vaddr = atmeth_swap_add(pkt); 573 } else { 574 *vaddr += atmeth_swap_add(pkt); 575 } 576 577 spin_unlock_bh(&atomic_ops_lock); 578 579 ret = RESPST_NONE; 580 out: 581 return ret; 582 } 583 584 static struct sk_buff *prepare_ack_packet(struct rxe_qp *qp, 585 struct rxe_pkt_info *pkt, 586 struct rxe_pkt_info *ack, 587 int opcode, 588 int payload, 589 u32 psn, 590 u8 syndrome, 591 u32 *crcp) 592 { 593 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 594 struct sk_buff *skb; 595 u32 crc = 0; 596 u32 *p; 597 int paylen; 598 int pad; 599 int err; 600 601 /* 602 * allocate packet 603 */ 604 pad = (-payload) & 0x3; 605 paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE; 606 607 skb = rxe_init_packet(rxe, &qp->pri_av, paylen, ack); 608 if (!skb) 609 return NULL; 610 611 ack->qp = qp; 612 ack->opcode = opcode; 613 ack->mask = rxe_opcode[opcode].mask; 614 ack->offset = pkt->offset; 615 ack->paylen = paylen; 616 617 /* fill in bth using the request packet headers */ 618 memcpy(ack->hdr, pkt->hdr, pkt->offset + RXE_BTH_BYTES); 619 620 bth_set_opcode(ack, opcode); 621 bth_set_qpn(ack, qp->attr.dest_qp_num); 622 bth_set_pad(ack, pad); 623 bth_set_se(ack, 0); 624 bth_set_psn(ack, psn); 625 bth_set_ack(ack, 0); 626 ack->psn = psn; 627 628 if (ack->mask & RXE_AETH_MASK) { 629 aeth_set_syn(ack, syndrome); 630 aeth_set_msn(ack, qp->resp.msn); 631 } 632 633 if (ack->mask & RXE_ATMACK_MASK) 634 atmack_set_orig(ack, qp->resp.atomic_orig); 635 636 err = rxe_prepare(ack, skb, &crc); 637 if (err) { 638 kfree_skb(skb); 639 return NULL; 640 } 641 642 if (crcp) { 643 /* CRC computation will be continued by the caller */ 644 *crcp = crc; 645 } else { 646 p = payload_addr(ack) + payload + bth_pad(ack); 647 *p = ~crc; 648 } 649 650 return skb; 651 } 652 653 /* RDMA read response. If res is not NULL, then we have a current RDMA request 654 * being processed or replayed. 655 */ 656 static enum resp_states read_reply(struct rxe_qp *qp, 657 struct rxe_pkt_info *req_pkt) 658 { 659 struct rxe_pkt_info ack_pkt; 660 struct sk_buff *skb; 661 int mtu = qp->mtu; 662 enum resp_states state; 663 int payload; 664 int opcode; 665 int err; 666 struct resp_res *res = qp->resp.res; 667 u32 icrc; 668 u32 *p; 669 670 if (!res) { 671 /* This is the first time we process that request. Get a 672 * resource 673 */ 674 res = &qp->resp.resources[qp->resp.res_head]; 675 676 free_rd_atomic_resource(qp, res); 677 rxe_advance_resp_resource(qp); 678 679 res->type = RXE_READ_MASK; 680 res->replay = 0; 681 682 res->read.va = qp->resp.va; 683 res->read.va_org = qp->resp.va; 684 685 res->first_psn = req_pkt->psn; 686 687 if (reth_len(req_pkt)) { 688 res->last_psn = (req_pkt->psn + 689 (reth_len(req_pkt) + mtu - 1) / 690 mtu - 1) & BTH_PSN_MASK; 691 } else { 692 res->last_psn = res->first_psn; 693 } 694 res->cur_psn = req_pkt->psn; 695 696 res->read.resid = qp->resp.resid; 697 res->read.length = qp->resp.resid; 698 res->read.rkey = qp->resp.rkey; 699 700 /* note res inherits the reference to mr from qp */ 701 res->read.mr = qp->resp.mr; 702 qp->resp.mr = NULL; 703 704 qp->resp.res = res; 705 res->state = rdatm_res_state_new; 706 } 707 708 if (res->state == rdatm_res_state_new) { 709 if (res->read.resid <= mtu) 710 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_ONLY; 711 else 712 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST; 713 } else { 714 if (res->read.resid > mtu) 715 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE; 716 else 717 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_LAST; 718 } 719 720 res->state = rdatm_res_state_next; 721 722 payload = min_t(int, res->read.resid, mtu); 723 724 skb = prepare_ack_packet(qp, req_pkt, &ack_pkt, opcode, payload, 725 res->cur_psn, AETH_ACK_UNLIMITED, &icrc); 726 if (!skb) 727 return RESPST_ERR_RNR; 728 729 err = rxe_mem_copy(res->read.mr, res->read.va, payload_addr(&ack_pkt), 730 payload, from_mem_obj, &icrc); 731 if (err) 732 pr_err("Failed copying memory\n"); 733 734 p = payload_addr(&ack_pkt) + payload + bth_pad(&ack_pkt); 735 *p = ~icrc; 736 737 err = rxe_xmit_packet(qp, &ack_pkt, skb); 738 if (err) { 739 pr_err("Failed sending RDMA reply.\n"); 740 return RESPST_ERR_RNR; 741 } 742 743 res->read.va += payload; 744 res->read.resid -= payload; 745 res->cur_psn = (res->cur_psn + 1) & BTH_PSN_MASK; 746 747 if (res->read.resid > 0) { 748 state = RESPST_DONE; 749 } else { 750 qp->resp.res = NULL; 751 if (!res->replay) 752 qp->resp.opcode = -1; 753 if (psn_compare(res->cur_psn, qp->resp.psn) >= 0) 754 qp->resp.psn = res->cur_psn; 755 state = RESPST_CLEANUP; 756 } 757 758 return state; 759 } 760 761 static void build_rdma_network_hdr(union rdma_network_hdr *hdr, 762 struct rxe_pkt_info *pkt) 763 { 764 struct sk_buff *skb = PKT_TO_SKB(pkt); 765 766 memset(hdr, 0, sizeof(*hdr)); 767 if (skb->protocol == htons(ETH_P_IP)) 768 memcpy(&hdr->roce4grh, ip_hdr(skb), sizeof(hdr->roce4grh)); 769 else if (skb->protocol == htons(ETH_P_IPV6)) 770 memcpy(&hdr->ibgrh, ipv6_hdr(skb), sizeof(hdr->ibgrh)); 771 } 772 773 /* Executes a new request. A retried request never reach that function (send 774 * and writes are discarded, and reads and atomics are retried elsewhere. 775 */ 776 static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt) 777 { 778 enum resp_states err; 779 780 if (pkt->mask & RXE_SEND_MASK) { 781 if (qp_type(qp) == IB_QPT_UD || 782 qp_type(qp) == IB_QPT_SMI || 783 qp_type(qp) == IB_QPT_GSI) { 784 union rdma_network_hdr hdr; 785 786 build_rdma_network_hdr(&hdr, pkt); 787 788 err = send_data_in(qp, &hdr, sizeof(hdr)); 789 if (err) 790 return err; 791 } 792 err = send_data_in(qp, payload_addr(pkt), payload_size(pkt)); 793 if (err) 794 return err; 795 } else if (pkt->mask & RXE_WRITE_MASK) { 796 err = write_data_in(qp, pkt); 797 if (err) 798 return err; 799 } else if (pkt->mask & RXE_READ_MASK) { 800 /* For RDMA Read we can increment the msn now. See C9-148. */ 801 qp->resp.msn++; 802 return RESPST_READ_REPLY; 803 } else if (pkt->mask & RXE_ATOMIC_MASK) { 804 err = process_atomic(qp, pkt); 805 if (err) 806 return err; 807 } else { 808 /* Unreachable */ 809 WARN_ON_ONCE(1); 810 } 811 812 /* next expected psn, read handles this separately */ 813 qp->resp.psn = (pkt->psn + 1) & BTH_PSN_MASK; 814 qp->resp.ack_psn = qp->resp.psn; 815 816 qp->resp.opcode = pkt->opcode; 817 qp->resp.status = IB_WC_SUCCESS; 818 819 if (pkt->mask & RXE_COMP_MASK) { 820 /* We successfully processed this new request. */ 821 qp->resp.msn++; 822 return RESPST_COMPLETE; 823 } else if (qp_type(qp) == IB_QPT_RC) 824 return RESPST_ACKNOWLEDGE; 825 else 826 return RESPST_CLEANUP; 827 } 828 829 static enum resp_states do_complete(struct rxe_qp *qp, 830 struct rxe_pkt_info *pkt) 831 { 832 struct rxe_cqe cqe; 833 struct ib_wc *wc = &cqe.ibwc; 834 struct ib_uverbs_wc *uwc = &cqe.uibwc; 835 struct rxe_recv_wqe *wqe = qp->resp.wqe; 836 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 837 838 if (unlikely(!wqe)) 839 return RESPST_CLEANUP; 840 841 memset(&cqe, 0, sizeof(cqe)); 842 843 if (qp->rcq->is_user) { 844 uwc->status = qp->resp.status; 845 uwc->qp_num = qp->ibqp.qp_num; 846 uwc->wr_id = wqe->wr_id; 847 } else { 848 wc->status = qp->resp.status; 849 wc->qp = &qp->ibqp; 850 wc->wr_id = wqe->wr_id; 851 } 852 853 if (wc->status == IB_WC_SUCCESS) { 854 rxe_counter_inc(rxe, RXE_CNT_RDMA_RECV); 855 wc->opcode = (pkt->mask & RXE_IMMDT_MASK && 856 pkt->mask & RXE_WRITE_MASK) ? 857 IB_WC_RECV_RDMA_WITH_IMM : IB_WC_RECV; 858 wc->vendor_err = 0; 859 wc->byte_len = wqe->dma.length - wqe->dma.resid; 860 861 /* fields after byte_len are different between kernel and user 862 * space 863 */ 864 if (qp->rcq->is_user) { 865 uwc->wc_flags = IB_WC_GRH; 866 867 if (pkt->mask & RXE_IMMDT_MASK) { 868 uwc->wc_flags |= IB_WC_WITH_IMM; 869 uwc->ex.imm_data = immdt_imm(pkt); 870 } 871 872 if (pkt->mask & RXE_IETH_MASK) { 873 uwc->wc_flags |= IB_WC_WITH_INVALIDATE; 874 uwc->ex.invalidate_rkey = ieth_rkey(pkt); 875 } 876 877 uwc->qp_num = qp->ibqp.qp_num; 878 879 if (pkt->mask & RXE_DETH_MASK) 880 uwc->src_qp = deth_sqp(pkt); 881 882 uwc->port_num = qp->attr.port_num; 883 } else { 884 struct sk_buff *skb = PKT_TO_SKB(pkt); 885 886 wc->wc_flags = IB_WC_GRH | IB_WC_WITH_NETWORK_HDR_TYPE; 887 if (skb->protocol == htons(ETH_P_IP)) 888 wc->network_hdr_type = RDMA_NETWORK_IPV4; 889 else 890 wc->network_hdr_type = RDMA_NETWORK_IPV6; 891 892 if (is_vlan_dev(skb->dev)) { 893 wc->wc_flags |= IB_WC_WITH_VLAN; 894 wc->vlan_id = vlan_dev_vlan_id(skb->dev); 895 } 896 897 if (pkt->mask & RXE_IMMDT_MASK) { 898 wc->wc_flags |= IB_WC_WITH_IMM; 899 wc->ex.imm_data = immdt_imm(pkt); 900 } 901 902 if (pkt->mask & RXE_IETH_MASK) { 903 struct rxe_mem *rmr; 904 905 wc->wc_flags |= IB_WC_WITH_INVALIDATE; 906 wc->ex.invalidate_rkey = ieth_rkey(pkt); 907 908 rmr = rxe_pool_get_index(&rxe->mr_pool, 909 wc->ex.invalidate_rkey >> 8); 910 if (unlikely(!rmr)) { 911 pr_err("Bad rkey %#x invalidation\n", 912 wc->ex.invalidate_rkey); 913 return RESPST_ERROR; 914 } 915 rmr->state = RXE_MEM_STATE_FREE; 916 rxe_drop_ref(rmr); 917 } 918 919 wc->qp = &qp->ibqp; 920 921 if (pkt->mask & RXE_DETH_MASK) 922 wc->src_qp = deth_sqp(pkt); 923 924 wc->port_num = qp->attr.port_num; 925 } 926 } 927 928 /* have copy for srq and reference for !srq */ 929 if (!qp->srq) 930 advance_consumer(qp->rq.queue); 931 932 qp->resp.wqe = NULL; 933 934 if (rxe_cq_post(qp->rcq, &cqe, pkt ? bth_se(pkt) : 1)) 935 return RESPST_ERR_CQ_OVERFLOW; 936 937 if (qp->resp.state == QP_STATE_ERROR) 938 return RESPST_CHK_RESOURCE; 939 940 if (!pkt) 941 return RESPST_DONE; 942 else if (qp_type(qp) == IB_QPT_RC) 943 return RESPST_ACKNOWLEDGE; 944 else 945 return RESPST_CLEANUP; 946 } 947 948 static int send_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt, 949 u8 syndrome, u32 psn) 950 { 951 int err = 0; 952 struct rxe_pkt_info ack_pkt; 953 struct sk_buff *skb; 954 955 skb = prepare_ack_packet(qp, pkt, &ack_pkt, IB_OPCODE_RC_ACKNOWLEDGE, 956 0, psn, syndrome, NULL); 957 if (!skb) { 958 err = -ENOMEM; 959 goto err1; 960 } 961 962 err = rxe_xmit_packet(qp, &ack_pkt, skb); 963 if (err) 964 pr_err_ratelimited("Failed sending ack\n"); 965 966 err1: 967 return err; 968 } 969 970 static int send_atomic_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt, 971 u8 syndrome) 972 { 973 int rc = 0; 974 struct rxe_pkt_info ack_pkt; 975 struct sk_buff *skb; 976 struct resp_res *res; 977 978 skb = prepare_ack_packet(qp, pkt, &ack_pkt, 979 IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE, 0, pkt->psn, 980 syndrome, NULL); 981 if (!skb) { 982 rc = -ENOMEM; 983 goto out; 984 } 985 986 rxe_add_ref(qp); 987 988 res = &qp->resp.resources[qp->resp.res_head]; 989 free_rd_atomic_resource(qp, res); 990 rxe_advance_resp_resource(qp); 991 992 memcpy(SKB_TO_PKT(skb), &ack_pkt, sizeof(ack_pkt)); 993 memset((unsigned char *)SKB_TO_PKT(skb) + sizeof(ack_pkt), 0, 994 sizeof(skb->cb) - sizeof(ack_pkt)); 995 996 skb_get(skb); 997 res->type = RXE_ATOMIC_MASK; 998 res->atomic.skb = skb; 999 res->first_psn = ack_pkt.psn; 1000 res->last_psn = ack_pkt.psn; 1001 res->cur_psn = ack_pkt.psn; 1002 1003 rc = rxe_xmit_packet(qp, &ack_pkt, skb); 1004 if (rc) { 1005 pr_err_ratelimited("Failed sending ack\n"); 1006 rxe_drop_ref(qp); 1007 } 1008 out: 1009 return rc; 1010 } 1011 1012 static enum resp_states acknowledge(struct rxe_qp *qp, 1013 struct rxe_pkt_info *pkt) 1014 { 1015 if (qp_type(qp) != IB_QPT_RC) 1016 return RESPST_CLEANUP; 1017 1018 if (qp->resp.aeth_syndrome != AETH_ACK_UNLIMITED) 1019 send_ack(qp, pkt, qp->resp.aeth_syndrome, pkt->psn); 1020 else if (pkt->mask & RXE_ATOMIC_MASK) 1021 send_atomic_ack(qp, pkt, AETH_ACK_UNLIMITED); 1022 else if (bth_ack(pkt)) 1023 send_ack(qp, pkt, AETH_ACK_UNLIMITED, pkt->psn); 1024 1025 return RESPST_CLEANUP; 1026 } 1027 1028 static enum resp_states cleanup(struct rxe_qp *qp, 1029 struct rxe_pkt_info *pkt) 1030 { 1031 struct sk_buff *skb; 1032 1033 if (pkt) { 1034 skb = skb_dequeue(&qp->req_pkts); 1035 rxe_drop_ref(qp); 1036 kfree_skb(skb); 1037 } 1038 1039 if (qp->resp.mr) { 1040 rxe_drop_ref(qp->resp.mr); 1041 qp->resp.mr = NULL; 1042 } 1043 1044 return RESPST_DONE; 1045 } 1046 1047 static struct resp_res *find_resource(struct rxe_qp *qp, u32 psn) 1048 { 1049 int i; 1050 1051 for (i = 0; i < qp->attr.max_dest_rd_atomic; i++) { 1052 struct resp_res *res = &qp->resp.resources[i]; 1053 1054 if (res->type == 0) 1055 continue; 1056 1057 if (psn_compare(psn, res->first_psn) >= 0 && 1058 psn_compare(psn, res->last_psn) <= 0) { 1059 return res; 1060 } 1061 } 1062 1063 return NULL; 1064 } 1065 1066 static enum resp_states duplicate_request(struct rxe_qp *qp, 1067 struct rxe_pkt_info *pkt) 1068 { 1069 enum resp_states rc; 1070 u32 prev_psn = (qp->resp.ack_psn - 1) & BTH_PSN_MASK; 1071 1072 if (pkt->mask & RXE_SEND_MASK || 1073 pkt->mask & RXE_WRITE_MASK) { 1074 /* SEND. Ack again and cleanup. C9-105. */ 1075 if (bth_ack(pkt)) 1076 send_ack(qp, pkt, AETH_ACK_UNLIMITED, prev_psn); 1077 rc = RESPST_CLEANUP; 1078 goto out; 1079 } else if (pkt->mask & RXE_READ_MASK) { 1080 struct resp_res *res; 1081 1082 res = find_resource(qp, pkt->psn); 1083 if (!res) { 1084 /* Resource not found. Class D error. Drop the 1085 * request. 1086 */ 1087 rc = RESPST_CLEANUP; 1088 goto out; 1089 } else { 1090 /* Ensure this new request is the same as the previous 1091 * one or a subset of it. 1092 */ 1093 u64 iova = reth_va(pkt); 1094 u32 resid = reth_len(pkt); 1095 1096 if (iova < res->read.va_org || 1097 resid > res->read.length || 1098 (iova + resid) > (res->read.va_org + 1099 res->read.length)) { 1100 rc = RESPST_CLEANUP; 1101 goto out; 1102 } 1103 1104 if (reth_rkey(pkt) != res->read.rkey) { 1105 rc = RESPST_CLEANUP; 1106 goto out; 1107 } 1108 1109 res->cur_psn = pkt->psn; 1110 res->state = (pkt->psn == res->first_psn) ? 1111 rdatm_res_state_new : 1112 rdatm_res_state_replay; 1113 res->replay = 1; 1114 1115 /* Reset the resource, except length. */ 1116 res->read.va_org = iova; 1117 res->read.va = iova; 1118 res->read.resid = resid; 1119 1120 /* Replay the RDMA read reply. */ 1121 qp->resp.res = res; 1122 rc = RESPST_READ_REPLY; 1123 goto out; 1124 } 1125 } else { 1126 struct resp_res *res; 1127 1128 /* Find the operation in our list of responder resources. */ 1129 res = find_resource(qp, pkt->psn); 1130 if (res) { 1131 skb_get(res->atomic.skb); 1132 /* Resend the result. */ 1133 rc = rxe_xmit_packet(qp, pkt, res->atomic.skb); 1134 if (rc) { 1135 pr_err("Failed resending result. This flow is not handled - skb ignored\n"); 1136 rc = RESPST_CLEANUP; 1137 goto out; 1138 } 1139 } 1140 1141 /* Resource not found. Class D error. Drop the request. */ 1142 rc = RESPST_CLEANUP; 1143 goto out; 1144 } 1145 out: 1146 return rc; 1147 } 1148 1149 /* Process a class A or C. Both are treated the same in this implementation. */ 1150 static void do_class_ac_error(struct rxe_qp *qp, u8 syndrome, 1151 enum ib_wc_status status) 1152 { 1153 qp->resp.aeth_syndrome = syndrome; 1154 qp->resp.status = status; 1155 1156 /* indicate that we should go through the ERROR state */ 1157 qp->resp.goto_error = 1; 1158 } 1159 1160 static enum resp_states do_class_d1e_error(struct rxe_qp *qp) 1161 { 1162 /* UC */ 1163 if (qp->srq) { 1164 /* Class E */ 1165 qp->resp.drop_msg = 1; 1166 if (qp->resp.wqe) { 1167 qp->resp.status = IB_WC_REM_INV_REQ_ERR; 1168 return RESPST_COMPLETE; 1169 } else { 1170 return RESPST_CLEANUP; 1171 } 1172 } else { 1173 /* Class D1. This packet may be the start of a 1174 * new message and could be valid. The previous 1175 * message is invalid and ignored. reset the 1176 * recv wr to its original state 1177 */ 1178 if (qp->resp.wqe) { 1179 qp->resp.wqe->dma.resid = qp->resp.wqe->dma.length; 1180 qp->resp.wqe->dma.cur_sge = 0; 1181 qp->resp.wqe->dma.sge_offset = 0; 1182 qp->resp.opcode = -1; 1183 } 1184 1185 if (qp->resp.mr) { 1186 rxe_drop_ref(qp->resp.mr); 1187 qp->resp.mr = NULL; 1188 } 1189 1190 return RESPST_CLEANUP; 1191 } 1192 } 1193 1194 static void rxe_drain_req_pkts(struct rxe_qp *qp, bool notify) 1195 { 1196 struct sk_buff *skb; 1197 1198 while ((skb = skb_dequeue(&qp->req_pkts))) { 1199 rxe_drop_ref(qp); 1200 kfree_skb(skb); 1201 } 1202 1203 if (notify) 1204 return; 1205 1206 while (!qp->srq && qp->rq.queue && queue_head(qp->rq.queue)) 1207 advance_consumer(qp->rq.queue); 1208 } 1209 1210 int rxe_responder(void *arg) 1211 { 1212 struct rxe_qp *qp = (struct rxe_qp *)arg; 1213 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 1214 enum resp_states state; 1215 struct rxe_pkt_info *pkt = NULL; 1216 int ret = 0; 1217 1218 rxe_add_ref(qp); 1219 1220 qp->resp.aeth_syndrome = AETH_ACK_UNLIMITED; 1221 1222 if (!qp->valid) { 1223 ret = -EINVAL; 1224 goto done; 1225 } 1226 1227 switch (qp->resp.state) { 1228 case QP_STATE_RESET: 1229 state = RESPST_RESET; 1230 break; 1231 1232 default: 1233 state = RESPST_GET_REQ; 1234 break; 1235 } 1236 1237 while (1) { 1238 pr_debug("qp#%d state = %s\n", qp_num(qp), 1239 resp_state_name[state]); 1240 switch (state) { 1241 case RESPST_GET_REQ: 1242 state = get_req(qp, &pkt); 1243 break; 1244 case RESPST_CHK_PSN: 1245 state = check_psn(qp, pkt); 1246 break; 1247 case RESPST_CHK_OP_SEQ: 1248 state = check_op_seq(qp, pkt); 1249 break; 1250 case RESPST_CHK_OP_VALID: 1251 state = check_op_valid(qp, pkt); 1252 break; 1253 case RESPST_CHK_RESOURCE: 1254 state = check_resource(qp, pkt); 1255 break; 1256 case RESPST_CHK_LENGTH: 1257 state = check_length(qp, pkt); 1258 break; 1259 case RESPST_CHK_RKEY: 1260 state = check_rkey(qp, pkt); 1261 break; 1262 case RESPST_EXECUTE: 1263 state = execute(qp, pkt); 1264 break; 1265 case RESPST_COMPLETE: 1266 state = do_complete(qp, pkt); 1267 break; 1268 case RESPST_READ_REPLY: 1269 state = read_reply(qp, pkt); 1270 break; 1271 case RESPST_ACKNOWLEDGE: 1272 state = acknowledge(qp, pkt); 1273 break; 1274 case RESPST_CLEANUP: 1275 state = cleanup(qp, pkt); 1276 break; 1277 case RESPST_DUPLICATE_REQUEST: 1278 state = duplicate_request(qp, pkt); 1279 break; 1280 case RESPST_ERR_PSN_OUT_OF_SEQ: 1281 /* RC only - Class B. Drop packet. */ 1282 send_ack(qp, pkt, AETH_NAK_PSN_SEQ_ERROR, qp->resp.psn); 1283 state = RESPST_CLEANUP; 1284 break; 1285 1286 case RESPST_ERR_TOO_MANY_RDMA_ATM_REQ: 1287 case RESPST_ERR_MISSING_OPCODE_FIRST: 1288 case RESPST_ERR_MISSING_OPCODE_LAST_C: 1289 case RESPST_ERR_UNSUPPORTED_OPCODE: 1290 case RESPST_ERR_MISALIGNED_ATOMIC: 1291 /* RC Only - Class C. */ 1292 do_class_ac_error(qp, AETH_NAK_INVALID_REQ, 1293 IB_WC_REM_INV_REQ_ERR); 1294 state = RESPST_COMPLETE; 1295 break; 1296 1297 case RESPST_ERR_MISSING_OPCODE_LAST_D1E: 1298 state = do_class_d1e_error(qp); 1299 break; 1300 case RESPST_ERR_RNR: 1301 if (qp_type(qp) == IB_QPT_RC) { 1302 rxe_counter_inc(rxe, RXE_CNT_SND_RNR); 1303 /* RC - class B */ 1304 send_ack(qp, pkt, AETH_RNR_NAK | 1305 (~AETH_TYPE_MASK & 1306 qp->attr.min_rnr_timer), 1307 pkt->psn); 1308 } else { 1309 /* UD/UC - class D */ 1310 qp->resp.drop_msg = 1; 1311 } 1312 state = RESPST_CLEANUP; 1313 break; 1314 1315 case RESPST_ERR_RKEY_VIOLATION: 1316 if (qp_type(qp) == IB_QPT_RC) { 1317 /* Class C */ 1318 do_class_ac_error(qp, AETH_NAK_REM_ACC_ERR, 1319 IB_WC_REM_ACCESS_ERR); 1320 state = RESPST_COMPLETE; 1321 } else { 1322 qp->resp.drop_msg = 1; 1323 if (qp->srq) { 1324 /* UC/SRQ Class D */ 1325 qp->resp.status = IB_WC_REM_ACCESS_ERR; 1326 state = RESPST_COMPLETE; 1327 } else { 1328 /* UC/non-SRQ Class E. */ 1329 state = RESPST_CLEANUP; 1330 } 1331 } 1332 break; 1333 1334 case RESPST_ERR_LENGTH: 1335 if (qp_type(qp) == IB_QPT_RC) { 1336 /* Class C */ 1337 do_class_ac_error(qp, AETH_NAK_INVALID_REQ, 1338 IB_WC_REM_INV_REQ_ERR); 1339 state = RESPST_COMPLETE; 1340 } else if (qp->srq) { 1341 /* UC/UD - class E */ 1342 qp->resp.status = IB_WC_REM_INV_REQ_ERR; 1343 state = RESPST_COMPLETE; 1344 } else { 1345 /* UC/UD - class D */ 1346 qp->resp.drop_msg = 1; 1347 state = RESPST_CLEANUP; 1348 } 1349 break; 1350 1351 case RESPST_ERR_MALFORMED_WQE: 1352 /* All, Class A. */ 1353 do_class_ac_error(qp, AETH_NAK_REM_OP_ERR, 1354 IB_WC_LOC_QP_OP_ERR); 1355 state = RESPST_COMPLETE; 1356 break; 1357 1358 case RESPST_ERR_CQ_OVERFLOW: 1359 /* All - Class G */ 1360 state = RESPST_ERROR; 1361 break; 1362 1363 case RESPST_DONE: 1364 if (qp->resp.goto_error) { 1365 state = RESPST_ERROR; 1366 break; 1367 } 1368 1369 goto done; 1370 1371 case RESPST_EXIT: 1372 if (qp->resp.goto_error) { 1373 state = RESPST_ERROR; 1374 break; 1375 } 1376 1377 goto exit; 1378 1379 case RESPST_RESET: 1380 rxe_drain_req_pkts(qp, false); 1381 qp->resp.wqe = NULL; 1382 goto exit; 1383 1384 case RESPST_ERROR: 1385 qp->resp.goto_error = 0; 1386 pr_warn("qp#%d moved to error state\n", qp_num(qp)); 1387 rxe_qp_error(qp); 1388 goto exit; 1389 1390 default: 1391 WARN_ON_ONCE(1); 1392 } 1393 } 1394 1395 exit: 1396 ret = -EAGAIN; 1397 done: 1398 rxe_drop_ref(qp); 1399 return ret; 1400 } 1401