2 * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
3 * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
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:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
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.
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
34 #include <linux/skbuff.h>
38 #include "rxe_queue.h"
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,
64 RESPST_ERR_RKEY_VIOLATION,
66 RESPST_ERR_CQ_OVERFLOW,
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",
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,
111 struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
113 skb_queue_tail(&qp->req_pkts, skb);
115 must_sched = (pkt->opcode == IB_OPCODE_RC_RDMA_READ_REQUEST) ||
116 (skb_queue_len(&qp->req_pkts) > 1);
118 rxe_run_task(&qp->resp.task, must_sched);
121 static inline enum resp_states get_req(struct rxe_qp *qp,
122 struct rxe_pkt_info **pkt_p)
126 if (qp->resp.state == QP_STATE_ERROR) {
127 skb = skb_dequeue(&qp->req_pkts);
129 /* drain request packet queue */
132 return RESPST_GET_REQ;
135 /* go drain recv wr queue */
136 return RESPST_CHK_RESOURCE;
139 skb = skb_peek(&qp->req_pkts);
143 *pkt_p = SKB_TO_PKT(skb);
145 return (qp->resp.res) ? RESPST_READ_REPLY : RESPST_CHK_PSN;
148 static enum resp_states check_psn(struct rxe_qp *qp,
149 struct rxe_pkt_info *pkt)
151 int diff = psn_compare(pkt->psn, qp->resp.psn);
153 switch (qp_type(qp)) {
156 if (qp->resp.sent_psn_nak)
157 return RESPST_CLEANUP;
159 qp->resp.sent_psn_nak = 1;
160 return RESPST_ERR_PSN_OUT_OF_SEQ;
162 } else if (diff < 0) {
163 return RESPST_DUPLICATE_REQUEST;
166 if (qp->resp.sent_psn_nak)
167 qp->resp.sent_psn_nak = 0;
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;
178 qp->resp.drop_msg = 1;
179 return RESPST_CLEANUP;
186 return RESPST_CHK_OP_SEQ;
189 static enum resp_states check_op_seq(struct rxe_qp *qp,
190 struct rxe_pkt_info *pkt)
192 switch (qp_type(qp)) {
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;
204 return RESPST_ERR_MISSING_OPCODE_LAST_C;
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;
215 return RESPST_ERR_MISSING_OPCODE_LAST_C;
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;
229 return RESPST_CHK_OP_VALID;
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;
244 return RESPST_ERR_MISSING_OPCODE_LAST_D1E;
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;
255 return RESPST_ERR_MISSING_OPCODE_LAST_D1E;
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;
269 return RESPST_CHK_OP_VALID;
275 return RESPST_CHK_OP_VALID;
279 static enum resp_states check_op_valid(struct rxe_qp *qp,
280 struct rxe_pkt_info *pkt)
282 switch (qp_type(qp)) {
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;
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;
314 return RESPST_CHK_RESOURCE;
317 static enum resp_states get_srq_wqe(struct rxe_qp *qp)
319 struct rxe_srq *srq = qp->srq;
320 struct rxe_queue *q = srq->rq.queue;
321 struct rxe_recv_wqe *wqe;
325 return RESPST_ERR_RNR;
327 spin_lock_bh(&srq->rq.consumer_lock);
331 spin_unlock_bh(&srq->rq.consumer_lock);
332 return RESPST_ERR_RNR;
335 /* note kernel and user space recv wqes have same size */
336 memcpy(&qp->resp.srq_wqe, wqe, sizeof(qp->resp.srq_wqe));
338 qp->resp.wqe = &qp->resp.srq_wqe.wqe;
341 if (srq->limit && srq->ibsrq.event_handler &&
342 (queue_count(q) < srq->limit)) {
347 spin_unlock_bh(&srq->rq.consumer_lock);
348 return RESPST_CHK_LENGTH;
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;
359 static enum resp_states check_resource(struct rxe_qp *qp,
360 struct rxe_pkt_info *pkt)
362 struct rxe_srq *srq = qp->srq;
364 if (qp->resp.state == QP_STATE_ERROR) {
366 qp->resp.status = IB_WC_WR_FLUSH_ERR;
367 return RESPST_COMPLETE;
369 qp->resp.wqe = queue_head(qp->rq.queue);
371 qp->resp.status = IB_WC_WR_FLUSH_ERR;
372 return RESPST_COMPLETE;
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
386 if (likely(qp->attr.max_dest_rd_atomic > 0))
387 return RESPST_CHK_LENGTH;
389 return RESPST_ERR_TOO_MANY_RDMA_ATM_REQ;
392 if (pkt->mask & RXE_RWR_MASK) {
394 return get_srq_wqe(qp);
396 qp->resp.wqe = queue_head(qp->rq.queue);
397 return (qp->resp.wqe) ? RESPST_CHK_LENGTH : RESPST_ERR_RNR;
400 return RESPST_CHK_LENGTH;
403 static enum resp_states check_length(struct rxe_qp *qp,
404 struct rxe_pkt_info *pkt)
406 switch (qp_type(qp)) {
408 return RESPST_CHK_RKEY;
411 return RESPST_CHK_RKEY;
414 return RESPST_CHK_RKEY;
418 static enum resp_states check_rkey(struct rxe_qp *qp,
419 struct rxe_pkt_info *pkt)
421 struct rxe_mem *mem = NULL;
427 enum resp_states state;
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);
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;
444 return RESPST_EXECUTE;
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;
455 rkey = qp->resp.rkey;
456 resid = qp->resp.resid;
457 pktlen = payload_size(pkt);
459 mem = lookup_mem(qp->pd, access, rkey, lookup_remote);
461 state = RESPST_ERR_RKEY_VIOLATION;
465 if (unlikely(mem->state == RXE_MEM_STATE_FREE)) {
466 state = RESPST_ERR_RKEY_VIOLATION;
470 if (mem_check_range(mem, va, resid)) {
471 state = RESPST_ERR_RKEY_VIOLATION;
475 if (pkt->mask & RXE_WRITE_MASK) {
477 if (pktlen != mtu || bth_pad(pkt)) {
478 state = RESPST_ERR_LENGTH;
482 qp->resp.resid = mtu;
484 if (pktlen != resid) {
485 state = RESPST_ERR_LENGTH;
488 if ((bth_pad(pkt) != (0x3 & (-resid)))) {
489 /* This case may not be exactly that
490 * but nothing else fits.
492 state = RESPST_ERR_LENGTH;
498 WARN_ON_ONCE(qp->resp.mr);
501 return RESPST_EXECUTE;
509 static enum resp_states send_data_in(struct rxe_qp *qp, void *data_addr,
513 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
515 err = copy_data(rxe, qp->pd, IB_ACCESS_LOCAL_WRITE, &qp->resp.wqe->dma,
516 data_addr, data_len, to_mem_obj, NULL);
518 return (err == -ENOSPC) ? RESPST_ERR_LENGTH
519 : RESPST_ERR_MALFORMED_WQE;
524 static enum resp_states write_data_in(struct rxe_qp *qp,
525 struct rxe_pkt_info *pkt)
527 enum resp_states rc = RESPST_NONE;
529 int data_len = payload_size(pkt);
531 err = rxe_mem_copy(qp->resp.mr, qp->resp.va, payload_addr(pkt),
532 data_len, to_mem_obj, NULL);
534 rc = RESPST_ERR_RKEY_VIOLATION;
538 qp->resp.va += data_len;
539 qp->resp.resid -= data_len;
545 /* Guarantee atomicity of atomic operations at the machine level. */
546 static DEFINE_SPINLOCK(atomic_ops_lock);
548 static enum resp_states process_atomic(struct rxe_qp *qp,
549 struct rxe_pkt_info *pkt)
551 u64 iova = atmeth_va(pkt);
553 enum resp_states ret;
554 struct rxe_mem *mr = qp->resp.mr;
556 if (mr->state != RXE_MEM_STATE_VALID) {
557 ret = RESPST_ERR_RKEY_VIOLATION;
561 vaddr = iova_to_vaddr(mr, iova, sizeof(u64));
563 /* check vaddr is 8 bytes aligned. */
564 if (!vaddr || (uintptr_t)vaddr & 7) {
565 ret = RESPST_ERR_MISALIGNED_ATOMIC;
569 spin_lock_bh(&atomic_ops_lock);
571 qp->resp.atomic_orig = *vaddr;
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);
578 *vaddr += atmeth_swap_add(pkt);
581 spin_unlock_bh(&atomic_ops_lock);
588 static struct sk_buff *prepare_ack_packet(struct rxe_qp *qp,
589 struct rxe_pkt_info *pkt,
590 struct rxe_pkt_info *ack,
597 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
608 pad = (-payload) & 0x3;
609 paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE;
611 skb = rxe_init_packet(rxe, &qp->pri_av, paylen, ack);
616 ack->opcode = opcode;
617 ack->mask = rxe_opcode[opcode].mask;
618 ack->offset = pkt->offset;
619 ack->paylen = paylen;
621 /* fill in bth using the request packet headers */
622 memcpy(ack->hdr, pkt->hdr, pkt->offset + RXE_BTH_BYTES);
624 bth_set_opcode(ack, opcode);
625 bth_set_qpn(ack, qp->attr.dest_qp_num);
626 bth_set_pad(ack, pad);
628 bth_set_psn(ack, psn);
632 if (ack->mask & RXE_AETH_MASK) {
633 aeth_set_syn(ack, syndrome);
634 aeth_set_msn(ack, qp->resp.msn);
637 if (ack->mask & RXE_ATMACK_MASK)
638 atmack_set_orig(ack, qp->resp.atomic_orig);
640 err = rxe_prepare(rxe, ack, skb, &crc);
647 /* CRC computation will be continued by the caller */
650 p = payload_addr(ack) + payload + bth_pad(ack);
657 /* RDMA read response. If res is not NULL, then we have a current RDMA request
658 * being processed or replayed.
660 static enum resp_states read_reply(struct rxe_qp *qp,
661 struct rxe_pkt_info *req_pkt)
663 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
664 struct rxe_pkt_info ack_pkt;
667 enum resp_states state;
671 struct resp_res *res = qp->resp.res;
676 /* This is the first time we process that request. Get a
679 res = &qp->resp.resources[qp->resp.res_head];
681 free_rd_atomic_resource(qp, res);
682 rxe_advance_resp_resource(qp);
684 res->type = RXE_READ_MASK;
686 res->read.va = qp->resp.va;
687 res->read.va_org = qp->resp.va;
689 res->first_psn = req_pkt->psn;
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;
696 res->last_psn = res->first_psn;
698 res->cur_psn = req_pkt->psn;
700 res->read.resid = qp->resp.resid;
701 res->read.length = qp->resp.resid;
702 res->read.rkey = qp->resp.rkey;
704 /* note res inherits the reference to mr from qp */
705 res->read.mr = qp->resp.mr;
709 res->state = rdatm_res_state_new;
712 if (res->state == rdatm_res_state_new) {
713 if (res->read.resid <= mtu)
714 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_ONLY;
716 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST;
718 if (res->read.resid > mtu)
719 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE;
721 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_LAST;
724 res->state = rdatm_res_state_next;
726 payload = min_t(int, res->read.resid, mtu);
728 skb = prepare_ack_packet(qp, req_pkt, &ack_pkt, opcode, payload,
729 res->cur_psn, AETH_ACK_UNLIMITED, &icrc);
731 return RESPST_ERR_RNR;
733 err = rxe_mem_copy(res->read.mr, res->read.va, payload_addr(&ack_pkt),
734 payload, from_mem_obj, &icrc);
736 pr_err("Failed copying memory\n");
738 p = payload_addr(&ack_pkt) + payload + bth_pad(&ack_pkt);
741 err = rxe_xmit_packet(rxe, qp, &ack_pkt, skb);
743 pr_err("Failed sending RDMA reply.\n");
745 return RESPST_ERR_RNR;
748 res->read.va += payload;
749 res->read.resid -= payload;
750 res->cur_psn = (res->cur_psn + 1) & BTH_PSN_MASK;
752 if (res->read.resid > 0) {
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;
765 static void build_rdma_network_hdr(union rdma_network_hdr *hdr,
766 struct rxe_pkt_info *pkt)
768 struct sk_buff *skb = PKT_TO_SKB(pkt);
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));
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.
780 static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt)
782 enum resp_states err;
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;
790 build_rdma_network_hdr(&hdr, pkt);
792 err = send_data_in(qp, &hdr, sizeof(hdr));
796 err = send_data_in(qp, payload_addr(pkt), payload_size(pkt));
799 } else if (pkt->mask & RXE_WRITE_MASK) {
800 err = write_data_in(qp, pkt);
803 } else if (pkt->mask & RXE_READ_MASK) {
804 /* For RDMA Read we can increment the msn now. See C9-148. */
806 return RESPST_READ_REPLY;
807 } else if (pkt->mask & RXE_ATOMIC_MASK) {
808 err = process_atomic(qp, pkt);
816 /* We successfully processed this new request. */
819 /* next expected psn, read handles this separately */
820 qp->resp.psn = (pkt->psn + 1) & BTH_PSN_MASK;
822 qp->resp.opcode = pkt->opcode;
823 qp->resp.status = IB_WC_SUCCESS;
825 if (pkt->mask & RXE_COMP_MASK)
826 return RESPST_COMPLETE;
827 else if (qp_type(qp) == IB_QPT_RC)
828 return RESPST_ACKNOWLEDGE;
830 return RESPST_CLEANUP;
833 static enum resp_states do_complete(struct rxe_qp *qp,
834 struct rxe_pkt_info *pkt)
837 struct ib_wc *wc = &cqe.ibwc;
838 struct ib_uverbs_wc *uwc = &cqe.uibwc;
839 struct rxe_recv_wqe *wqe = qp->resp.wqe;
842 return RESPST_CLEANUP;
844 memset(&cqe, 0, sizeof(cqe));
846 wc->wr_id = wqe->wr_id;
847 wc->status = qp->resp.status;
850 /* fields after status are not required for errors */
851 if (wc->status == IB_WC_SUCCESS) {
852 wc->opcode = (pkt->mask & RXE_IMMDT_MASK &&
853 pkt->mask & RXE_WRITE_MASK) ?
854 IB_WC_RECV_RDMA_WITH_IMM : IB_WC_RECV;
856 wc->byte_len = wqe->dma.length - wqe->dma.resid;
858 /* fields after byte_len are different between kernel and user
861 if (qp->rcq->is_user) {
862 uwc->wc_flags = IB_WC_GRH;
864 if (pkt->mask & RXE_IMMDT_MASK) {
865 uwc->wc_flags |= IB_WC_WITH_IMM;
867 (__u32 __force)immdt_imm(pkt);
870 if (pkt->mask & RXE_IETH_MASK) {
871 uwc->wc_flags |= IB_WC_WITH_INVALIDATE;
872 uwc->ex.invalidate_rkey = ieth_rkey(pkt);
875 uwc->qp_num = qp->ibqp.qp_num;
877 if (pkt->mask & RXE_DETH_MASK)
878 uwc->src_qp = deth_sqp(pkt);
880 uwc->port_num = qp->attr.port_num;
882 struct sk_buff *skb = PKT_TO_SKB(pkt);
884 wc->wc_flags = IB_WC_GRH | IB_WC_WITH_NETWORK_HDR_TYPE;
885 if (skb->protocol == htons(ETH_P_IP))
886 wc->network_hdr_type = RDMA_NETWORK_IPV4;
888 wc->network_hdr_type = RDMA_NETWORK_IPV6;
890 if (pkt->mask & RXE_IMMDT_MASK) {
891 wc->wc_flags |= IB_WC_WITH_IMM;
892 wc->ex.imm_data = immdt_imm(pkt);
895 if (pkt->mask & RXE_IETH_MASK) {
896 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
899 wc->wc_flags |= IB_WC_WITH_INVALIDATE;
900 wc->ex.invalidate_rkey = ieth_rkey(pkt);
902 rmr = rxe_pool_get_index(&rxe->mr_pool,
903 wc->ex.invalidate_rkey >> 8);
904 if (unlikely(!rmr)) {
905 pr_err("Bad rkey %#x invalidation\n",
906 wc->ex.invalidate_rkey);
909 rmr->state = RXE_MEM_STATE_FREE;
915 if (pkt->mask & RXE_DETH_MASK)
916 wc->src_qp = deth_sqp(pkt);
918 wc->port_num = qp->attr.port_num;
922 /* have copy for srq and reference for !srq */
924 advance_consumer(qp->rq.queue);
928 if (rxe_cq_post(qp->rcq, &cqe, pkt ? bth_se(pkt) : 1))
929 return RESPST_ERR_CQ_OVERFLOW;
931 if (qp->resp.state == QP_STATE_ERROR)
932 return RESPST_CHK_RESOURCE;
936 else if (qp_type(qp) == IB_QPT_RC)
937 return RESPST_ACKNOWLEDGE;
939 return RESPST_CLEANUP;
942 static int send_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
943 u8 syndrome, u32 psn)
946 struct rxe_pkt_info ack_pkt;
948 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
950 skb = prepare_ack_packet(qp, pkt, &ack_pkt, IB_OPCODE_RC_ACKNOWLEDGE,
951 0, psn, syndrome, NULL);
957 err = rxe_xmit_packet(rxe, qp, &ack_pkt, skb);
959 pr_err_ratelimited("Failed sending ack\n");
967 static int send_atomic_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
971 struct rxe_pkt_info ack_pkt;
973 struct sk_buff *skb_copy;
974 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
975 struct resp_res *res;
977 skb = prepare_ack_packet(qp, pkt, &ack_pkt,
978 IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE, 0, pkt->psn,
985 skb_copy = skb_clone(skb, GFP_ATOMIC);
987 rxe_add_ref(qp); /* for the new SKB */
989 pr_warn("Could not clone atomic response\n");
994 res = &qp->resp.resources[qp->resp.res_head];
995 free_rd_atomic_resource(qp, res);
996 rxe_advance_resp_resource(qp);
998 memcpy(SKB_TO_PKT(skb), &ack_pkt, sizeof(skb->cb));
1000 res->type = RXE_ATOMIC_MASK;
1001 res->atomic.skb = skb;
1002 res->first_psn = ack_pkt.psn;
1003 res->last_psn = ack_pkt.psn;
1004 res->cur_psn = ack_pkt.psn;
1006 rc = rxe_xmit_packet(rxe, qp, &ack_pkt, skb_copy);
1008 pr_err_ratelimited("Failed sending ack\n");
1010 kfree_skb(skb_copy);
1017 static enum resp_states acknowledge(struct rxe_qp *qp,
1018 struct rxe_pkt_info *pkt)
1020 if (qp_type(qp) != IB_QPT_RC)
1021 return RESPST_CLEANUP;
1023 if (qp->resp.aeth_syndrome != AETH_ACK_UNLIMITED)
1024 send_ack(qp, pkt, qp->resp.aeth_syndrome, pkt->psn);
1025 else if (pkt->mask & RXE_ATOMIC_MASK)
1026 send_atomic_ack(qp, pkt, AETH_ACK_UNLIMITED);
1027 else if (bth_ack(pkt))
1028 send_ack(qp, pkt, AETH_ACK_UNLIMITED, pkt->psn);
1030 return RESPST_CLEANUP;
1033 static enum resp_states cleanup(struct rxe_qp *qp,
1034 struct rxe_pkt_info *pkt)
1036 struct sk_buff *skb;
1039 skb = skb_dequeue(&qp->req_pkts);
1045 rxe_drop_ref(qp->resp.mr);
1052 static struct resp_res *find_resource(struct rxe_qp *qp, u32 psn)
1056 for (i = 0; i < qp->attr.max_rd_atomic; i++) {
1057 struct resp_res *res = &qp->resp.resources[i];
1062 if (psn_compare(psn, res->first_psn) >= 0 &&
1063 psn_compare(psn, res->last_psn) <= 0) {
1071 static enum resp_states duplicate_request(struct rxe_qp *qp,
1072 struct rxe_pkt_info *pkt)
1074 enum resp_states rc;
1075 u32 prev_psn = (qp->resp.psn - 1) & BTH_PSN_MASK;
1077 if (pkt->mask & RXE_SEND_MASK ||
1078 pkt->mask & RXE_WRITE_MASK) {
1079 /* SEND. Ack again and cleanup. C9-105. */
1081 send_ack(qp, pkt, AETH_ACK_UNLIMITED, prev_psn);
1082 rc = RESPST_CLEANUP;
1084 } else if (pkt->mask & RXE_READ_MASK) {
1085 struct resp_res *res;
1087 res = find_resource(qp, pkt->psn);
1089 /* Resource not found. Class D error. Drop the
1092 rc = RESPST_CLEANUP;
1095 /* Ensure this new request is the same as the previous
1096 * one or a subset of it.
1098 u64 iova = reth_va(pkt);
1099 u32 resid = reth_len(pkt);
1101 if (iova < res->read.va_org ||
1102 resid > res->read.length ||
1103 (iova + resid) > (res->read.va_org +
1104 res->read.length)) {
1105 rc = RESPST_CLEANUP;
1109 if (reth_rkey(pkt) != res->read.rkey) {
1110 rc = RESPST_CLEANUP;
1114 res->cur_psn = pkt->psn;
1115 res->state = (pkt->psn == res->first_psn) ?
1116 rdatm_res_state_new :
1117 rdatm_res_state_replay;
1119 /* Reset the resource, except length. */
1120 res->read.va_org = iova;
1121 res->read.va = iova;
1122 res->read.resid = resid;
1124 /* Replay the RDMA read reply. */
1126 rc = RESPST_READ_REPLY;
1130 struct resp_res *res;
1132 /* Find the operation in our list of responder resources. */
1133 res = find_resource(qp, pkt->psn);
1135 struct sk_buff *skb_copy;
1137 skb_copy = skb_clone(res->atomic.skb, GFP_ATOMIC);
1139 rxe_add_ref(qp); /* for the new SKB */
1141 pr_warn("Couldn't clone atomic resp\n");
1142 rc = RESPST_CLEANUP;
1146 /* Resend the result. */
1147 rc = rxe_xmit_packet(to_rdev(qp->ibqp.device), qp,
1150 pr_err("Failed resending result. This flow is not handled - skb ignored\n");
1152 kfree_skb(skb_copy);
1153 rc = RESPST_CLEANUP;
1158 /* Resource not found. Class D error. Drop the request. */
1159 rc = RESPST_CLEANUP;
1166 /* Process a class A or C. Both are treated the same in this implementation. */
1167 static void do_class_ac_error(struct rxe_qp *qp, u8 syndrome,
1168 enum ib_wc_status status)
1170 qp->resp.aeth_syndrome = syndrome;
1171 qp->resp.status = status;
1173 /* indicate that we should go through the ERROR state */
1174 qp->resp.goto_error = 1;
1177 static enum resp_states do_class_d1e_error(struct rxe_qp *qp)
1182 qp->resp.drop_msg = 1;
1184 qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1185 return RESPST_COMPLETE;
1187 return RESPST_CLEANUP;
1190 /* Class D1. This packet may be the start of a
1191 * new message and could be valid. The previous
1192 * message is invalid and ignored. reset the
1193 * recv wr to its original state
1196 qp->resp.wqe->dma.resid = qp->resp.wqe->dma.length;
1197 qp->resp.wqe->dma.cur_sge = 0;
1198 qp->resp.wqe->dma.sge_offset = 0;
1199 qp->resp.opcode = -1;
1203 rxe_drop_ref(qp->resp.mr);
1207 return RESPST_CLEANUP;
1211 void rxe_drain_req_pkts(struct rxe_qp *qp, bool notify)
1213 struct sk_buff *skb;
1215 while ((skb = skb_dequeue(&qp->req_pkts))) {
1220 while (!qp->srq && qp->rq.queue && queue_head(qp->rq.queue))
1221 advance_consumer(qp->rq.queue);
1224 int rxe_responder(void *arg)
1226 struct rxe_qp *qp = (struct rxe_qp *)arg;
1227 enum resp_states state;
1228 struct rxe_pkt_info *pkt = NULL;
1233 qp->resp.aeth_syndrome = AETH_ACK_UNLIMITED;
1240 switch (qp->resp.state) {
1241 case QP_STATE_RESET:
1242 state = RESPST_RESET;
1246 state = RESPST_GET_REQ;
1251 pr_debug("qp#%d state = %s\n", qp_num(qp),
1252 resp_state_name[state]);
1254 case RESPST_GET_REQ:
1255 state = get_req(qp, &pkt);
1257 case RESPST_CHK_PSN:
1258 state = check_psn(qp, pkt);
1260 case RESPST_CHK_OP_SEQ:
1261 state = check_op_seq(qp, pkt);
1263 case RESPST_CHK_OP_VALID:
1264 state = check_op_valid(qp, pkt);
1266 case RESPST_CHK_RESOURCE:
1267 state = check_resource(qp, pkt);
1269 case RESPST_CHK_LENGTH:
1270 state = check_length(qp, pkt);
1272 case RESPST_CHK_RKEY:
1273 state = check_rkey(qp, pkt);
1275 case RESPST_EXECUTE:
1276 state = execute(qp, pkt);
1278 case RESPST_COMPLETE:
1279 state = do_complete(qp, pkt);
1281 case RESPST_READ_REPLY:
1282 state = read_reply(qp, pkt);
1284 case RESPST_ACKNOWLEDGE:
1285 state = acknowledge(qp, pkt);
1287 case RESPST_CLEANUP:
1288 state = cleanup(qp, pkt);
1290 case RESPST_DUPLICATE_REQUEST:
1291 state = duplicate_request(qp, pkt);
1293 case RESPST_ERR_PSN_OUT_OF_SEQ:
1294 /* RC only - Class B. Drop packet. */
1295 send_ack(qp, pkt, AETH_NAK_PSN_SEQ_ERROR, qp->resp.psn);
1296 state = RESPST_CLEANUP;
1299 case RESPST_ERR_TOO_MANY_RDMA_ATM_REQ:
1300 case RESPST_ERR_MISSING_OPCODE_FIRST:
1301 case RESPST_ERR_MISSING_OPCODE_LAST_C:
1302 case RESPST_ERR_UNSUPPORTED_OPCODE:
1303 case RESPST_ERR_MISALIGNED_ATOMIC:
1304 /* RC Only - Class C. */
1305 do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1306 IB_WC_REM_INV_REQ_ERR);
1307 state = RESPST_COMPLETE;
1310 case RESPST_ERR_MISSING_OPCODE_LAST_D1E:
1311 state = do_class_d1e_error(qp);
1313 case RESPST_ERR_RNR:
1314 if (qp_type(qp) == IB_QPT_RC) {
1316 send_ack(qp, pkt, AETH_RNR_NAK |
1318 qp->attr.min_rnr_timer),
1321 /* UD/UC - class D */
1322 qp->resp.drop_msg = 1;
1324 state = RESPST_CLEANUP;
1327 case RESPST_ERR_RKEY_VIOLATION:
1328 if (qp_type(qp) == IB_QPT_RC) {
1330 do_class_ac_error(qp, AETH_NAK_REM_ACC_ERR,
1331 IB_WC_REM_ACCESS_ERR);
1332 state = RESPST_COMPLETE;
1334 qp->resp.drop_msg = 1;
1336 /* UC/SRQ Class D */
1337 qp->resp.status = IB_WC_REM_ACCESS_ERR;
1338 state = RESPST_COMPLETE;
1340 /* UC/non-SRQ Class E. */
1341 state = RESPST_CLEANUP;
1346 case RESPST_ERR_LENGTH:
1347 if (qp_type(qp) == IB_QPT_RC) {
1349 do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1350 IB_WC_REM_INV_REQ_ERR);
1351 state = RESPST_COMPLETE;
1352 } else if (qp->srq) {
1353 /* UC/UD - class E */
1354 qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1355 state = RESPST_COMPLETE;
1357 /* UC/UD - class D */
1358 qp->resp.drop_msg = 1;
1359 state = RESPST_CLEANUP;
1363 case RESPST_ERR_MALFORMED_WQE:
1365 do_class_ac_error(qp, AETH_NAK_REM_OP_ERR,
1366 IB_WC_LOC_QP_OP_ERR);
1367 state = RESPST_COMPLETE;
1370 case RESPST_ERR_CQ_OVERFLOW:
1372 state = RESPST_ERROR;
1376 if (qp->resp.goto_error) {
1377 state = RESPST_ERROR;
1384 if (qp->resp.goto_error) {
1385 state = RESPST_ERROR;
1392 rxe_drain_req_pkts(qp, false);
1393 qp->resp.wqe = NULL;
1397 qp->resp.goto_error = 0;
1398 pr_warn("qp#%d moved to error state\n", qp_num(qp));