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); 152 153 switch (qp_type(qp)) { 154 case IB_QPT_RC: 155 if (diff > 0) { 156 if (qp->resp.sent_psn_nak) 157 return RESPST_CLEANUP; 158 159 qp->resp.sent_psn_nak = 1; 160 return RESPST_ERR_PSN_OUT_OF_SEQ; 161 162 } else if (diff < 0) { 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(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; 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 err1; 463 } 464 465 if (unlikely(mem->state == RXE_MEM_STATE_FREE)) { 466 state = RESPST_ERR_RKEY_VIOLATION; 467 goto err1; 468 } 469 470 if (mem_check_range(mem, va, resid)) { 471 state = RESPST_ERR_RKEY_VIOLATION; 472 goto err2; 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 err2; 480 } 481 482 resid = mtu; 483 } else { 484 if (pktlen != resid) { 485 state = RESPST_ERR_LENGTH; 486 goto err2; 487 } 488 if ((bth_pad(pkt) != (0x3 & (-resid)))) { 489 /* This case may not be exactly that 490 * but nothing else fits. 491 */ 492 state = RESPST_ERR_LENGTH; 493 goto err2; 494 } 495 } 496 } 497 498 WARN_ON(qp->resp.mr); 499 500 qp->resp.mr = mem; 501 return RESPST_EXECUTE; 502 503 err2: 504 rxe_drop_ref(mem); 505 err1: 506 return state; 507 } 508 509 static enum resp_states send_data_in(struct rxe_qp *qp, void *data_addr, 510 int data_len) 511 { 512 int err; 513 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 514 515 err = copy_data(rxe, qp->pd, IB_ACCESS_LOCAL_WRITE, &qp->resp.wqe->dma, 516 data_addr, data_len, to_mem_obj, NULL); 517 if (unlikely(err)) 518 return (err == -ENOSPC) ? RESPST_ERR_LENGTH 519 : RESPST_ERR_MALFORMED_WQE; 520 521 return RESPST_NONE; 522 } 523 524 static enum resp_states write_data_in(struct rxe_qp *qp, 525 struct rxe_pkt_info *pkt) 526 { 527 enum resp_states rc = RESPST_NONE; 528 int err; 529 int data_len = payload_size(pkt); 530 531 err = rxe_mem_copy(qp->resp.mr, qp->resp.va, payload_addr(pkt), 532 data_len, to_mem_obj, NULL); 533 if (err) { 534 rc = RESPST_ERR_RKEY_VIOLATION; 535 goto out; 536 } 537 538 qp->resp.va += data_len; 539 qp->resp.resid -= data_len; 540 541 out: 542 return rc; 543 } 544 545 /* Guarantee atomicity of atomic operations at the machine level. */ 546 static DEFINE_SPINLOCK(atomic_ops_lock); 547 548 static enum resp_states process_atomic(struct rxe_qp *qp, 549 struct rxe_pkt_info *pkt) 550 { 551 u64 iova = atmeth_va(pkt); 552 u64 *vaddr; 553 enum resp_states ret; 554 struct rxe_mem *mr = qp->resp.mr; 555 556 if (mr->state != RXE_MEM_STATE_VALID) { 557 ret = RESPST_ERR_RKEY_VIOLATION; 558 goto out; 559 } 560 561 vaddr = iova_to_vaddr(mr, iova, sizeof(u64)); 562 563 /* check vaddr is 8 bytes aligned. */ 564 if (!vaddr || (uintptr_t)vaddr & 7) { 565 ret = RESPST_ERR_MISALIGNED_ATOMIC; 566 goto out; 567 } 568 569 spin_lock_bh(&atomic_ops_lock); 570 571 qp->resp.atomic_orig = *vaddr; 572 573 if (pkt->opcode == IB_OPCODE_RC_COMPARE_SWAP || 574 pkt->opcode == IB_OPCODE_RD_COMPARE_SWAP) { 575 if (*vaddr == atmeth_comp(pkt)) 576 *vaddr = atmeth_swap_add(pkt); 577 } else { 578 *vaddr += atmeth_swap_add(pkt); 579 } 580 581 spin_unlock_bh(&atomic_ops_lock); 582 583 ret = RESPST_NONE; 584 out: 585 return ret; 586 } 587 588 static struct sk_buff *prepare_ack_packet(struct rxe_qp *qp, 589 struct rxe_pkt_info *pkt, 590 struct rxe_pkt_info *ack, 591 int opcode, 592 int payload, 593 u32 psn, 594 u8 syndrome, 595 u32 *crcp) 596 { 597 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 598 struct sk_buff *skb; 599 u32 crc = 0; 600 u32 *p; 601 int paylen; 602 int pad; 603 int err; 604 605 /* 606 * allocate packet 607 */ 608 pad = (-payload) & 0x3; 609 paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE; 610 611 skb = rxe->ifc_ops->init_packet(rxe, &qp->pri_av, paylen, ack); 612 if (!skb) 613 return NULL; 614 615 ack->qp = qp; 616 ack->opcode = opcode; 617 ack->mask = rxe_opcode[opcode].mask; 618 ack->offset = pkt->offset; 619 ack->paylen = paylen; 620 621 /* fill in bth using the request packet headers */ 622 memcpy(ack->hdr, pkt->hdr, pkt->offset + RXE_BTH_BYTES); 623 624 bth_set_opcode(ack, opcode); 625 bth_set_qpn(ack, qp->attr.dest_qp_num); 626 bth_set_pad(ack, pad); 627 bth_set_se(ack, 0); 628 bth_set_psn(ack, psn); 629 bth_set_ack(ack, 0); 630 ack->psn = psn; 631 632 if (ack->mask & RXE_AETH_MASK) { 633 aeth_set_syn(ack, syndrome); 634 aeth_set_msn(ack, qp->resp.msn); 635 } 636 637 if (ack->mask & RXE_ATMACK_MASK) 638 atmack_set_orig(ack, qp->resp.atomic_orig); 639 640 err = rxe->ifc_ops->prepare(rxe, ack, skb, &crc); 641 if (err) { 642 kfree_skb(skb); 643 return NULL; 644 } 645 646 if (crcp) { 647 /* CRC computation will be continued by the caller */ 648 *crcp = crc; 649 } else { 650 p = payload_addr(ack) + payload + bth_pad(ack); 651 *p = ~crc; 652 } 653 654 return skb; 655 } 656 657 /* RDMA read response. If res is not NULL, then we have a current RDMA request 658 * being processed or replayed. 659 */ 660 static enum resp_states read_reply(struct rxe_qp *qp, 661 struct rxe_pkt_info *req_pkt) 662 { 663 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 664 struct rxe_pkt_info ack_pkt; 665 struct sk_buff *skb; 666 int mtu = qp->mtu; 667 enum resp_states state; 668 int payload; 669 int opcode; 670 int err; 671 struct resp_res *res = qp->resp.res; 672 u32 icrc; 673 u32 *p; 674 675 if (!res) { 676 /* This is the first time we process that request. Get a 677 * resource 678 */ 679 res = &qp->resp.resources[qp->resp.res_head]; 680 681 free_rd_atomic_resource(qp, res); 682 rxe_advance_resp_resource(qp); 683 684 res->type = RXE_READ_MASK; 685 686 res->read.va = qp->resp.va; 687 res->read.va_org = qp->resp.va; 688 689 res->first_psn = req_pkt->psn; 690 691 if (reth_len(req_pkt)) { 692 res->last_psn = (req_pkt->psn + 693 (reth_len(req_pkt) + mtu - 1) / 694 mtu - 1) & BTH_PSN_MASK; 695 } else { 696 res->last_psn = res->first_psn; 697 } 698 res->cur_psn = req_pkt->psn; 699 700 res->read.resid = qp->resp.resid; 701 res->read.length = qp->resp.resid; 702 res->read.rkey = qp->resp.rkey; 703 704 /* note res inherits the reference to mr from qp */ 705 res->read.mr = qp->resp.mr; 706 qp->resp.mr = NULL; 707 708 qp->resp.res = res; 709 res->state = rdatm_res_state_new; 710 } 711 712 if (res->state == rdatm_res_state_new) { 713 if (res->read.resid <= mtu) 714 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_ONLY; 715 else 716 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST; 717 } else { 718 if (res->read.resid > mtu) 719 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE; 720 else 721 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_LAST; 722 } 723 724 res->state = rdatm_res_state_next; 725 726 payload = min_t(int, res->read.resid, mtu); 727 728 skb = prepare_ack_packet(qp, req_pkt, &ack_pkt, opcode, payload, 729 res->cur_psn, AETH_ACK_UNLIMITED, &icrc); 730 if (!skb) 731 return RESPST_ERR_RNR; 732 733 err = rxe_mem_copy(res->read.mr, res->read.va, payload_addr(&ack_pkt), 734 payload, from_mem_obj, &icrc); 735 if (err) 736 pr_err("Failed copying memory\n"); 737 738 p = payload_addr(&ack_pkt) + payload + bth_pad(&ack_pkt); 739 *p = ~icrc; 740 741 err = rxe_xmit_packet(rxe, qp, &ack_pkt, skb); 742 if (err) { 743 pr_err("Failed sending RDMA reply.\n"); 744 kfree_skb(skb); 745 return RESPST_ERR_RNR; 746 } 747 748 res->read.va += payload; 749 res->read.resid -= payload; 750 res->cur_psn = (res->cur_psn + 1) & BTH_PSN_MASK; 751 752 if (res->read.resid > 0) { 753 state = RESPST_DONE; 754 } else { 755 qp->resp.res = NULL; 756 qp->resp.opcode = -1; 757 if (psn_compare(res->cur_psn, qp->resp.psn) >= 0) 758 qp->resp.psn = res->cur_psn; 759 state = RESPST_CLEANUP; 760 } 761 762 return state; 763 } 764 765 static void build_rdma_network_hdr(union rdma_network_hdr *hdr, 766 struct rxe_pkt_info *pkt) 767 { 768 struct sk_buff *skb = PKT_TO_SKB(pkt); 769 770 memset(hdr, 0, sizeof(*hdr)); 771 if (skb->protocol == htons(ETH_P_IP)) 772 memcpy(&hdr->roce4grh, ip_hdr(skb), sizeof(hdr->roce4grh)); 773 else if (skb->protocol == htons(ETH_P_IPV6)) 774 memcpy(&hdr->ibgrh, ipv6_hdr(skb), sizeof(hdr->ibgrh)); 775 } 776 777 /* Executes a new request. A retried request never reach that function (send 778 * and writes are discarded, and reads and atomics are retried elsewhere. 779 */ 780 static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt) 781 { 782 enum resp_states err; 783 784 if (pkt->mask & RXE_SEND_MASK) { 785 if (qp_type(qp) == IB_QPT_UD || 786 qp_type(qp) == IB_QPT_SMI || 787 qp_type(qp) == IB_QPT_GSI) { 788 union rdma_network_hdr hdr; 789 790 build_rdma_network_hdr(&hdr, pkt); 791 792 err = send_data_in(qp, &hdr, sizeof(hdr)); 793 if (err) 794 return err; 795 } 796 err = send_data_in(qp, payload_addr(pkt), payload_size(pkt)); 797 if (err) 798 return err; 799 } else if (pkt->mask & RXE_WRITE_MASK) { 800 err = write_data_in(qp, pkt); 801 if (err) 802 return err; 803 } else if (pkt->mask & RXE_READ_MASK) { 804 /* For RDMA Read we can increment the msn now. See C9-148. */ 805 qp->resp.msn++; 806 return RESPST_READ_REPLY; 807 } else if (pkt->mask & RXE_ATOMIC_MASK) { 808 err = process_atomic(qp, pkt); 809 if (err) 810 return err; 811 } else 812 /* Unreachable */ 813 WARN_ON(1); 814 815 /* We successfully processed this new request. */ 816 qp->resp.msn++; 817 818 /* next expected psn, read handles this separately */ 819 qp->resp.psn = (pkt->psn + 1) & BTH_PSN_MASK; 820 821 qp->resp.opcode = pkt->opcode; 822 qp->resp.status = IB_WC_SUCCESS; 823 824 if (pkt->mask & RXE_COMP_MASK) 825 return RESPST_COMPLETE; 826 else if (qp_type(qp) == IB_QPT_RC) 827 return RESPST_ACKNOWLEDGE; 828 else 829 return RESPST_CLEANUP; 830 } 831 832 static enum resp_states do_complete(struct rxe_qp *qp, 833 struct rxe_pkt_info *pkt) 834 { 835 struct rxe_cqe cqe; 836 struct ib_wc *wc = &cqe.ibwc; 837 struct ib_uverbs_wc *uwc = &cqe.uibwc; 838 struct rxe_recv_wqe *wqe = qp->resp.wqe; 839 840 if (unlikely(!wqe)) 841 return RESPST_CLEANUP; 842 843 memset(&cqe, 0, sizeof(cqe)); 844 845 wc->wr_id = wqe->wr_id; 846 wc->status = qp->resp.status; 847 wc->qp = &qp->ibqp; 848 849 /* fields after status are not required for errors */ 850 if (wc->status == IB_WC_SUCCESS) { 851 wc->opcode = (pkt->mask & RXE_IMMDT_MASK && 852 pkt->mask & RXE_WRITE_MASK) ? 853 IB_WC_RECV_RDMA_WITH_IMM : IB_WC_RECV; 854 wc->vendor_err = 0; 855 wc->byte_len = wqe->dma.length - wqe->dma.resid; 856 857 /* fields after byte_len are different between kernel and user 858 * space 859 */ 860 if (qp->rcq->is_user) { 861 uwc->wc_flags = IB_WC_GRH; 862 863 if (pkt->mask & RXE_IMMDT_MASK) { 864 uwc->wc_flags |= IB_WC_WITH_IMM; 865 uwc->ex.imm_data = 866 (__u32 __force)immdt_imm(pkt); 867 } 868 869 if (pkt->mask & RXE_IETH_MASK) { 870 uwc->wc_flags |= IB_WC_WITH_INVALIDATE; 871 uwc->ex.invalidate_rkey = ieth_rkey(pkt); 872 } 873 874 uwc->qp_num = qp->ibqp.qp_num; 875 876 if (pkt->mask & RXE_DETH_MASK) 877 uwc->src_qp = deth_sqp(pkt); 878 879 uwc->port_num = qp->attr.port_num; 880 } else { 881 struct sk_buff *skb = PKT_TO_SKB(pkt); 882 883 wc->wc_flags = IB_WC_GRH | IB_WC_WITH_NETWORK_HDR_TYPE; 884 if (skb->protocol == htons(ETH_P_IP)) 885 wc->network_hdr_type = RDMA_NETWORK_IPV4; 886 else 887 wc->network_hdr_type = RDMA_NETWORK_IPV6; 888 889 if (pkt->mask & RXE_IMMDT_MASK) { 890 wc->wc_flags |= IB_WC_WITH_IMM; 891 wc->ex.imm_data = immdt_imm(pkt); 892 } 893 894 if (pkt->mask & RXE_IETH_MASK) { 895 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 896 struct rxe_mem *rmr; 897 898 wc->wc_flags |= IB_WC_WITH_INVALIDATE; 899 wc->ex.invalidate_rkey = ieth_rkey(pkt); 900 901 rmr = rxe_pool_get_index(&rxe->mr_pool, 902 wc->ex.invalidate_rkey >> 8); 903 if (unlikely(!rmr)) { 904 pr_err("Bad rkey %#x invalidation\n", 905 wc->ex.invalidate_rkey); 906 return RESPST_ERROR; 907 } 908 rmr->state = RXE_MEM_STATE_FREE; 909 } 910 911 wc->qp = &qp->ibqp; 912 913 if (pkt->mask & RXE_DETH_MASK) 914 wc->src_qp = deth_sqp(pkt); 915 916 wc->port_num = qp->attr.port_num; 917 } 918 } 919 920 /* have copy for srq and reference for !srq */ 921 if (!qp->srq) 922 advance_consumer(qp->rq.queue); 923 924 qp->resp.wqe = NULL; 925 926 if (rxe_cq_post(qp->rcq, &cqe, pkt ? bth_se(pkt) : 1)) 927 return RESPST_ERR_CQ_OVERFLOW; 928 929 if (qp->resp.state == QP_STATE_ERROR) 930 return RESPST_CHK_RESOURCE; 931 932 if (!pkt) 933 return RESPST_DONE; 934 else if (qp_type(qp) == IB_QPT_RC) 935 return RESPST_ACKNOWLEDGE; 936 else 937 return RESPST_CLEANUP; 938 } 939 940 static int send_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt, 941 u8 syndrome, u32 psn) 942 { 943 int err = 0; 944 struct rxe_pkt_info ack_pkt; 945 struct sk_buff *skb; 946 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 947 948 skb = prepare_ack_packet(qp, pkt, &ack_pkt, IB_OPCODE_RC_ACKNOWLEDGE, 949 0, psn, syndrome, NULL); 950 if (!skb) { 951 err = -ENOMEM; 952 goto err1; 953 } 954 955 err = rxe_xmit_packet(rxe, qp, &ack_pkt, skb); 956 if (err) { 957 pr_err_ratelimited("Failed sending ack\n"); 958 kfree_skb(skb); 959 } 960 961 err1: 962 return err; 963 } 964 965 static int send_atomic_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt, 966 u8 syndrome) 967 { 968 int rc = 0; 969 struct rxe_pkt_info ack_pkt; 970 struct sk_buff *skb; 971 struct sk_buff *skb_copy; 972 struct rxe_dev *rxe = to_rdev(qp->ibqp.device); 973 struct resp_res *res; 974 975 skb = prepare_ack_packet(qp, pkt, &ack_pkt, 976 IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE, 0, pkt->psn, 977 syndrome, NULL); 978 if (!skb) { 979 rc = -ENOMEM; 980 goto out; 981 } 982 983 skb_copy = skb_clone(skb, GFP_ATOMIC); 984 if (skb_copy) 985 rxe_add_ref(qp); /* for the new SKB */ 986 else { 987 pr_warn("Could not clone atomic response\n"); 988 rc = -ENOMEM; 989 goto out; 990 } 991 992 res = &qp->resp.resources[qp->resp.res_head]; 993 free_rd_atomic_resource(qp, res); 994 rxe_advance_resp_resource(qp); 995 996 memcpy(SKB_TO_PKT(skb), &ack_pkt, sizeof(skb->cb)); 997 998 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(rxe, qp, &ack_pkt, skb_copy); 1005 if (rc) { 1006 pr_err_ratelimited("Failed sending ack\n"); 1007 rxe_drop_ref(qp); 1008 kfree_skb(skb_copy); 1009 } 1010 1011 out: 1012 return rc; 1013 } 1014 1015 static enum resp_states acknowledge(struct rxe_qp *qp, 1016 struct rxe_pkt_info *pkt) 1017 { 1018 if (qp_type(qp) != IB_QPT_RC) 1019 return RESPST_CLEANUP; 1020 1021 if (qp->resp.aeth_syndrome != AETH_ACK_UNLIMITED) 1022 send_ack(qp, pkt, qp->resp.aeth_syndrome, pkt->psn); 1023 else if (pkt->mask & RXE_ATOMIC_MASK) 1024 send_atomic_ack(qp, pkt, AETH_ACK_UNLIMITED); 1025 else if (bth_ack(pkt)) 1026 send_ack(qp, pkt, AETH_ACK_UNLIMITED, pkt->psn); 1027 1028 return RESPST_CLEANUP; 1029 } 1030 1031 static enum resp_states cleanup(struct rxe_qp *qp, 1032 struct rxe_pkt_info *pkt) 1033 { 1034 struct sk_buff *skb; 1035 1036 if (pkt) { 1037 skb = skb_dequeue(&qp->req_pkts); 1038 rxe_drop_ref(qp); 1039 kfree_skb(skb); 1040 } 1041 1042 if (qp->resp.mr) { 1043 rxe_drop_ref(qp->resp.mr); 1044 qp->resp.mr = NULL; 1045 } 1046 1047 return RESPST_DONE; 1048 } 1049 1050 static struct resp_res *find_resource(struct rxe_qp *qp, u32 psn) 1051 { 1052 int i; 1053 1054 for (i = 0; i < qp->attr.max_rd_atomic; i++) { 1055 struct resp_res *res = &qp->resp.resources[i]; 1056 1057 if (res->type == 0) 1058 continue; 1059 1060 if (psn_compare(psn, res->first_psn) >= 0 && 1061 psn_compare(psn, res->last_psn) <= 0) { 1062 return res; 1063 } 1064 } 1065 1066 return NULL; 1067 } 1068 1069 static enum resp_states duplicate_request(struct rxe_qp *qp, 1070 struct rxe_pkt_info *pkt) 1071 { 1072 enum resp_states rc; 1073 1074 if (pkt->mask & RXE_SEND_MASK || 1075 pkt->mask & RXE_WRITE_MASK) { 1076 /* SEND. Ack again and cleanup. C9-105. */ 1077 if (bth_ack(pkt)) 1078 send_ack(qp, pkt, AETH_ACK_UNLIMITED, qp->resp.psn - 1); 1079 rc = RESPST_CLEANUP; 1080 goto out; 1081 } else if (pkt->mask & RXE_READ_MASK) { 1082 struct resp_res *res; 1083 1084 res = find_resource(qp, pkt->psn); 1085 if (!res) { 1086 /* Resource not found. Class D error. Drop the 1087 * request. 1088 */ 1089 rc = RESPST_CLEANUP; 1090 goto out; 1091 } else { 1092 /* Ensure this new request is the same as the previous 1093 * one or a subset of it. 1094 */ 1095 u64 iova = reth_va(pkt); 1096 u32 resid = reth_len(pkt); 1097 1098 if (iova < res->read.va_org || 1099 resid > res->read.length || 1100 (iova + resid) > (res->read.va_org + 1101 res->read.length)) { 1102 rc = RESPST_CLEANUP; 1103 goto out; 1104 } 1105 1106 if (reth_rkey(pkt) != res->read.rkey) { 1107 rc = RESPST_CLEANUP; 1108 goto out; 1109 } 1110 1111 res->cur_psn = pkt->psn; 1112 res->state = (pkt->psn == res->first_psn) ? 1113 rdatm_res_state_new : 1114 rdatm_res_state_replay; 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 struct sk_buff *skb_copy; 1133 1134 skb_copy = skb_clone(res->atomic.skb, GFP_ATOMIC); 1135 if (skb_copy) { 1136 rxe_add_ref(qp); /* for the new SKB */ 1137 } else { 1138 pr_warn("Couldn't clone atomic resp\n"); 1139 rc = RESPST_CLEANUP; 1140 goto out; 1141 } 1142 1143 /* Resend the result. */ 1144 rc = rxe_xmit_packet(to_rdev(qp->ibqp.device), qp, 1145 pkt, skb_copy); 1146 if (rc) { 1147 pr_err("Failed resending result. This flow is not handled - skb ignored\n"); 1148 rxe_drop_ref(qp); 1149 kfree_skb(skb_copy); 1150 rc = RESPST_CLEANUP; 1151 goto out; 1152 } 1153 } 1154 1155 /* Resource not found. Class D error. Drop the request. */ 1156 rc = RESPST_CLEANUP; 1157 goto out; 1158 } 1159 out: 1160 return rc; 1161 } 1162 1163 /* Process a class A or C. Both are treated the same in this implementation. */ 1164 static void do_class_ac_error(struct rxe_qp *qp, u8 syndrome, 1165 enum ib_wc_status status) 1166 { 1167 qp->resp.aeth_syndrome = syndrome; 1168 qp->resp.status = status; 1169 1170 /* indicate that we should go through the ERROR state */ 1171 qp->resp.goto_error = 1; 1172 } 1173 1174 static enum resp_states do_class_d1e_error(struct rxe_qp *qp) 1175 { 1176 /* UC */ 1177 if (qp->srq) { 1178 /* Class E */ 1179 qp->resp.drop_msg = 1; 1180 if (qp->resp.wqe) { 1181 qp->resp.status = IB_WC_REM_INV_REQ_ERR; 1182 return RESPST_COMPLETE; 1183 } else { 1184 return RESPST_CLEANUP; 1185 } 1186 } else { 1187 /* Class D1. This packet may be the start of a 1188 * new message and could be valid. The previous 1189 * message is invalid and ignored. reset the 1190 * recv wr to its original state 1191 */ 1192 if (qp->resp.wqe) { 1193 qp->resp.wqe->dma.resid = qp->resp.wqe->dma.length; 1194 qp->resp.wqe->dma.cur_sge = 0; 1195 qp->resp.wqe->dma.sge_offset = 0; 1196 qp->resp.opcode = -1; 1197 } 1198 1199 if (qp->resp.mr) { 1200 rxe_drop_ref(qp->resp.mr); 1201 qp->resp.mr = NULL; 1202 } 1203 1204 return RESPST_CLEANUP; 1205 } 1206 } 1207 1208 int rxe_responder(void *arg) 1209 { 1210 struct rxe_qp *qp = (struct rxe_qp *)arg; 1211 enum resp_states state; 1212 struct rxe_pkt_info *pkt = NULL; 1213 int ret = 0; 1214 1215 rxe_add_ref(qp); 1216 1217 qp->resp.aeth_syndrome = AETH_ACK_UNLIMITED; 1218 1219 if (!qp->valid) { 1220 ret = -EINVAL; 1221 goto done; 1222 } 1223 1224 switch (qp->resp.state) { 1225 case QP_STATE_RESET: 1226 state = RESPST_RESET; 1227 break; 1228 1229 default: 1230 state = RESPST_GET_REQ; 1231 break; 1232 } 1233 1234 while (1) { 1235 pr_debug("qp#%d state = %s\n", qp_num(qp), 1236 resp_state_name[state]); 1237 switch (state) { 1238 case RESPST_GET_REQ: 1239 state = get_req(qp, &pkt); 1240 break; 1241 case RESPST_CHK_PSN: 1242 state = check_psn(qp, pkt); 1243 break; 1244 case RESPST_CHK_OP_SEQ: 1245 state = check_op_seq(qp, pkt); 1246 break; 1247 case RESPST_CHK_OP_VALID: 1248 state = check_op_valid(qp, pkt); 1249 break; 1250 case RESPST_CHK_RESOURCE: 1251 state = check_resource(qp, pkt); 1252 break; 1253 case RESPST_CHK_LENGTH: 1254 state = check_length(qp, pkt); 1255 break; 1256 case RESPST_CHK_RKEY: 1257 state = check_rkey(qp, pkt); 1258 break; 1259 case RESPST_EXECUTE: 1260 state = execute(qp, pkt); 1261 break; 1262 case RESPST_COMPLETE: 1263 state = do_complete(qp, pkt); 1264 break; 1265 case RESPST_READ_REPLY: 1266 state = read_reply(qp, pkt); 1267 break; 1268 case RESPST_ACKNOWLEDGE: 1269 state = acknowledge(qp, pkt); 1270 break; 1271 case RESPST_CLEANUP: 1272 state = cleanup(qp, pkt); 1273 break; 1274 case RESPST_DUPLICATE_REQUEST: 1275 state = duplicate_request(qp, pkt); 1276 break; 1277 case RESPST_ERR_PSN_OUT_OF_SEQ: 1278 /* RC only - Class B. Drop packet. */ 1279 send_ack(qp, pkt, AETH_NAK_PSN_SEQ_ERROR, qp->resp.psn); 1280 state = RESPST_CLEANUP; 1281 break; 1282 1283 case RESPST_ERR_TOO_MANY_RDMA_ATM_REQ: 1284 case RESPST_ERR_MISSING_OPCODE_FIRST: 1285 case RESPST_ERR_MISSING_OPCODE_LAST_C: 1286 case RESPST_ERR_UNSUPPORTED_OPCODE: 1287 case RESPST_ERR_MISALIGNED_ATOMIC: 1288 /* RC Only - Class C. */ 1289 do_class_ac_error(qp, AETH_NAK_INVALID_REQ, 1290 IB_WC_REM_INV_REQ_ERR); 1291 state = RESPST_COMPLETE; 1292 break; 1293 1294 case RESPST_ERR_MISSING_OPCODE_LAST_D1E: 1295 state = do_class_d1e_error(qp); 1296 break; 1297 case RESPST_ERR_RNR: 1298 if (qp_type(qp) == IB_QPT_RC) { 1299 /* RC - class B */ 1300 send_ack(qp, pkt, AETH_RNR_NAK | 1301 (~AETH_TYPE_MASK & 1302 qp->attr.min_rnr_timer), 1303 pkt->psn); 1304 } else { 1305 /* UD/UC - class D */ 1306 qp->resp.drop_msg = 1; 1307 } 1308 state = RESPST_CLEANUP; 1309 break; 1310 1311 case RESPST_ERR_RKEY_VIOLATION: 1312 if (qp_type(qp) == IB_QPT_RC) { 1313 /* Class C */ 1314 do_class_ac_error(qp, AETH_NAK_REM_ACC_ERR, 1315 IB_WC_REM_ACCESS_ERR); 1316 state = RESPST_COMPLETE; 1317 } else { 1318 qp->resp.drop_msg = 1; 1319 if (qp->srq) { 1320 /* UC/SRQ Class D */ 1321 qp->resp.status = IB_WC_REM_ACCESS_ERR; 1322 state = RESPST_COMPLETE; 1323 } else { 1324 /* UC/non-SRQ Class E. */ 1325 state = RESPST_CLEANUP; 1326 } 1327 } 1328 break; 1329 1330 case RESPST_ERR_LENGTH: 1331 if (qp_type(qp) == IB_QPT_RC) { 1332 /* Class C */ 1333 do_class_ac_error(qp, AETH_NAK_INVALID_REQ, 1334 IB_WC_REM_INV_REQ_ERR); 1335 state = RESPST_COMPLETE; 1336 } else if (qp->srq) { 1337 /* UC/UD - class E */ 1338 qp->resp.status = IB_WC_REM_INV_REQ_ERR; 1339 state = RESPST_COMPLETE; 1340 } else { 1341 /* UC/UD - class D */ 1342 qp->resp.drop_msg = 1; 1343 state = RESPST_CLEANUP; 1344 } 1345 break; 1346 1347 case RESPST_ERR_MALFORMED_WQE: 1348 /* All, Class A. */ 1349 do_class_ac_error(qp, AETH_NAK_REM_OP_ERR, 1350 IB_WC_LOC_QP_OP_ERR); 1351 state = RESPST_COMPLETE; 1352 break; 1353 1354 case RESPST_ERR_CQ_OVERFLOW: 1355 /* All - Class G */ 1356 state = RESPST_ERROR; 1357 break; 1358 1359 case RESPST_DONE: 1360 if (qp->resp.goto_error) { 1361 state = RESPST_ERROR; 1362 break; 1363 } 1364 1365 goto done; 1366 1367 case RESPST_EXIT: 1368 if (qp->resp.goto_error) { 1369 state = RESPST_ERROR; 1370 break; 1371 } 1372 1373 goto exit; 1374 1375 case RESPST_RESET: { 1376 struct sk_buff *skb; 1377 1378 while ((skb = skb_dequeue(&qp->req_pkts))) { 1379 rxe_drop_ref(qp); 1380 kfree_skb(skb); 1381 } 1382 1383 while (!qp->srq && qp->rq.queue && 1384 queue_head(qp->rq.queue)) 1385 advance_consumer(qp->rq.queue); 1386 1387 qp->resp.wqe = NULL; 1388 goto exit; 1389 } 1390 1391 case RESPST_ERROR: 1392 qp->resp.goto_error = 0; 1393 pr_warn("qp#%d moved to error state\n", qp_num(qp)); 1394 rxe_qp_error(qp); 1395 goto exit; 1396 1397 default: 1398 WARN_ON(1); 1399 } 1400 } 1401 1402 exit: 1403 ret = -EAGAIN; 1404 done: 1405 rxe_drop_ref(qp); 1406 return ret; 1407 } 1408