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_qp *qp, struct sk_buff *skb)
110 struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
112 skb_queue_tail(&qp->req_pkts, skb);
114 must_sched = (pkt->opcode == IB_OPCODE_RC_RDMA_READ_REQUEST) ||
115 (skb_queue_len(&qp->req_pkts) > 1);
117 rxe_run_task(&qp->resp.task, must_sched);
120 static inline enum resp_states get_req(struct rxe_qp *qp,
121 struct rxe_pkt_info **pkt_p)
125 if (qp->resp.state == QP_STATE_ERROR) {
126 while ((skb = skb_dequeue(&qp->req_pkts))) {
131 /* go drain recv wr queue */
132 return RESPST_CHK_RESOURCE;
135 skb = skb_peek(&qp->req_pkts);
139 *pkt_p = SKB_TO_PKT(skb);
141 return (qp->resp.res) ? RESPST_READ_REPLY : RESPST_CHK_PSN;
144 static enum resp_states check_psn(struct rxe_qp *qp,
145 struct rxe_pkt_info *pkt)
147 int diff = psn_compare(pkt->psn, qp->resp.psn);
148 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
150 switch (qp_type(qp)) {
153 if (qp->resp.sent_psn_nak)
154 return RESPST_CLEANUP;
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;
160 } else if (diff < 0) {
161 rxe_counter_inc(rxe, RXE_CNT_DUP_REQ);
162 return RESPST_DUPLICATE_REQUEST;
165 if (qp->resp.sent_psn_nak)
166 qp->resp.sent_psn_nak = 0;
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;
177 qp->resp.drop_msg = 1;
178 return RESPST_CLEANUP;
185 return RESPST_CHK_OP_SEQ;
188 static enum resp_states check_op_seq(struct rxe_qp *qp,
189 struct rxe_pkt_info *pkt)
191 switch (qp_type(qp)) {
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;
203 return RESPST_ERR_MISSING_OPCODE_LAST_C;
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;
214 return RESPST_ERR_MISSING_OPCODE_LAST_C;
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;
228 return RESPST_CHK_OP_VALID;
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;
243 return RESPST_ERR_MISSING_OPCODE_LAST_D1E;
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;
254 return RESPST_ERR_MISSING_OPCODE_LAST_D1E;
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;
268 return RESPST_CHK_OP_VALID;
274 return RESPST_CHK_OP_VALID;
278 static enum resp_states check_op_valid(struct rxe_qp *qp,
279 struct rxe_pkt_info *pkt)
281 switch (qp_type(qp)) {
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;
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;
313 return RESPST_CHK_RESOURCE;
316 static enum resp_states get_srq_wqe(struct rxe_qp *qp)
318 struct rxe_srq *srq = qp->srq;
319 struct rxe_queue *q = srq->rq.queue;
320 struct rxe_recv_wqe *wqe;
324 return RESPST_ERR_RNR;
326 spin_lock_bh(&srq->rq.consumer_lock);
330 spin_unlock_bh(&srq->rq.consumer_lock);
331 return RESPST_ERR_RNR;
334 /* note kernel and user space recv wqes have same size */
335 memcpy(&qp->resp.srq_wqe, wqe, sizeof(qp->resp.srq_wqe));
337 qp->resp.wqe = &qp->resp.srq_wqe.wqe;
340 if (srq->limit && srq->ibsrq.event_handler &&
341 (queue_count(q) < srq->limit)) {
346 spin_unlock_bh(&srq->rq.consumer_lock);
347 return RESPST_CHK_LENGTH;
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;
358 static enum resp_states check_resource(struct rxe_qp *qp,
359 struct rxe_pkt_info *pkt)
361 struct rxe_srq *srq = qp->srq;
363 if (qp->resp.state == QP_STATE_ERROR) {
365 qp->resp.status = IB_WC_WR_FLUSH_ERR;
366 return RESPST_COMPLETE;
368 qp->resp.wqe = queue_head(qp->rq.queue);
370 qp->resp.status = IB_WC_WR_FLUSH_ERR;
371 return RESPST_COMPLETE;
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
385 if (likely(qp->attr.max_dest_rd_atomic > 0))
386 return RESPST_CHK_LENGTH;
388 return RESPST_ERR_TOO_MANY_RDMA_ATM_REQ;
391 if (pkt->mask & RXE_RWR_MASK) {
393 return get_srq_wqe(qp);
395 qp->resp.wqe = queue_head(qp->rq.queue);
396 return (qp->resp.wqe) ? RESPST_CHK_LENGTH : RESPST_ERR_RNR;
399 return RESPST_CHK_LENGTH;
402 static enum resp_states check_length(struct rxe_qp *qp,
403 struct rxe_pkt_info *pkt)
405 switch (qp_type(qp)) {
407 return RESPST_CHK_RKEY;
410 return RESPST_CHK_RKEY;
413 return RESPST_CHK_RKEY;
417 static enum resp_states check_rkey(struct rxe_qp *qp,
418 struct rxe_pkt_info *pkt)
420 struct rxe_mem *mem = NULL;
426 enum resp_states state;
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 qp->resp.length = 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 if (pktlen != resid) {
483 state = RESPST_ERR_LENGTH;
486 if ((bth_pad(pkt) != (0x3 & (-resid)))) {
487 /* This case may not be exactly that
488 * but nothing else fits.
490 state = RESPST_ERR_LENGTH;
496 WARN_ON_ONCE(qp->resp.mr);
499 return RESPST_EXECUTE;
507 static enum resp_states send_data_in(struct rxe_qp *qp, void *data_addr,
512 err = copy_data(qp->pd, IB_ACCESS_LOCAL_WRITE, &qp->resp.wqe->dma,
513 data_addr, data_len, to_mem_obj, NULL);
515 return (err == -ENOSPC) ? RESPST_ERR_LENGTH
516 : RESPST_ERR_MALFORMED_WQE;
521 static enum resp_states write_data_in(struct rxe_qp *qp,
522 struct rxe_pkt_info *pkt)
524 enum resp_states rc = RESPST_NONE;
526 int data_len = payload_size(pkt);
528 err = rxe_mem_copy(qp->resp.mr, qp->resp.va, payload_addr(pkt),
529 data_len, to_mem_obj, NULL);
531 rc = RESPST_ERR_RKEY_VIOLATION;
535 qp->resp.va += data_len;
536 qp->resp.resid -= data_len;
542 /* Guarantee atomicity of atomic operations at the machine level. */
543 static DEFINE_SPINLOCK(atomic_ops_lock);
545 static enum resp_states process_atomic(struct rxe_qp *qp,
546 struct rxe_pkt_info *pkt)
548 u64 iova = atmeth_va(pkt);
550 enum resp_states ret;
551 struct rxe_mem *mr = qp->resp.mr;
553 if (mr->state != RXE_MEM_STATE_VALID) {
554 ret = RESPST_ERR_RKEY_VIOLATION;
558 vaddr = iova_to_vaddr(mr, iova, sizeof(u64));
560 /* check vaddr is 8 bytes aligned. */
561 if (!vaddr || (uintptr_t)vaddr & 7) {
562 ret = RESPST_ERR_MISALIGNED_ATOMIC;
566 spin_lock_bh(&atomic_ops_lock);
568 qp->resp.atomic_orig = *vaddr;
570 if (pkt->opcode == IB_OPCODE_RC_COMPARE_SWAP ||
571 pkt->opcode == IB_OPCODE_RD_COMPARE_SWAP) {
572 if (*vaddr == atmeth_comp(pkt))
573 *vaddr = atmeth_swap_add(pkt);
575 *vaddr += atmeth_swap_add(pkt);
578 spin_unlock_bh(&atomic_ops_lock);
585 static struct sk_buff *prepare_ack_packet(struct rxe_qp *qp,
586 struct rxe_pkt_info *pkt,
587 struct rxe_pkt_info *ack,
594 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
605 pad = (-payload) & 0x3;
606 paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE;
608 skb = rxe_init_packet(rxe, &qp->pri_av, paylen, ack);
613 ack->opcode = opcode;
614 ack->mask = rxe_opcode[opcode].mask;
615 ack->offset = pkt->offset;
616 ack->paylen = paylen;
618 /* fill in bth using the request packet headers */
619 memcpy(ack->hdr, pkt->hdr, pkt->offset + RXE_BTH_BYTES);
621 bth_set_opcode(ack, opcode);
622 bth_set_qpn(ack, qp->attr.dest_qp_num);
623 bth_set_pad(ack, pad);
625 bth_set_psn(ack, psn);
629 if (ack->mask & RXE_AETH_MASK) {
630 aeth_set_syn(ack, syndrome);
631 aeth_set_msn(ack, qp->resp.msn);
634 if (ack->mask & RXE_ATMACK_MASK)
635 atmack_set_orig(ack, qp->resp.atomic_orig);
637 err = rxe_prepare(ack, skb, &crc);
644 /* CRC computation will be continued by the caller */
647 p = payload_addr(ack) + payload + bth_pad(ack);
654 /* RDMA read response. If res is not NULL, then we have a current RDMA request
655 * being processed or replayed.
657 static enum resp_states read_reply(struct rxe_qp *qp,
658 struct rxe_pkt_info *req_pkt)
660 struct rxe_pkt_info ack_pkt;
663 enum resp_states state;
667 struct resp_res *res = qp->resp.res;
672 /* This is the first time we process that request. Get a
675 res = &qp->resp.resources[qp->resp.res_head];
677 free_rd_atomic_resource(qp, res);
678 rxe_advance_resp_resource(qp);
680 res->type = RXE_READ_MASK;
683 res->read.va = qp->resp.va;
684 res->read.va_org = qp->resp.va;
686 res->first_psn = req_pkt->psn;
688 if (reth_len(req_pkt)) {
689 res->last_psn = (req_pkt->psn +
690 (reth_len(req_pkt) + mtu - 1) /
691 mtu - 1) & BTH_PSN_MASK;
693 res->last_psn = res->first_psn;
695 res->cur_psn = req_pkt->psn;
697 res->read.resid = qp->resp.resid;
698 res->read.length = qp->resp.resid;
699 res->read.rkey = qp->resp.rkey;
701 /* note res inherits the reference to mr from qp */
702 res->read.mr = qp->resp.mr;
706 res->state = rdatm_res_state_new;
709 if (res->state == rdatm_res_state_new) {
710 if (res->read.resid <= mtu)
711 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_ONLY;
713 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST;
715 if (res->read.resid > mtu)
716 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE;
718 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_LAST;
721 res->state = rdatm_res_state_next;
723 payload = min_t(int, res->read.resid, mtu);
725 skb = prepare_ack_packet(qp, req_pkt, &ack_pkt, opcode, payload,
726 res->cur_psn, AETH_ACK_UNLIMITED, &icrc);
728 return RESPST_ERR_RNR;
730 err = rxe_mem_copy(res->read.mr, res->read.va, payload_addr(&ack_pkt),
731 payload, from_mem_obj, &icrc);
733 pr_err("Failed copying memory\n");
735 p = payload_addr(&ack_pkt) + payload + bth_pad(&ack_pkt);
738 err = rxe_xmit_packet(qp, &ack_pkt, skb);
740 pr_err("Failed sending RDMA reply.\n");
741 return RESPST_ERR_RNR;
744 res->read.va += payload;
745 res->read.resid -= payload;
746 res->cur_psn = (res->cur_psn + 1) & BTH_PSN_MASK;
748 if (res->read.resid > 0) {
753 qp->resp.opcode = -1;
754 if (psn_compare(res->cur_psn, qp->resp.psn) >= 0)
755 qp->resp.psn = res->cur_psn;
756 state = RESPST_CLEANUP;
762 static void build_rdma_network_hdr(union rdma_network_hdr *hdr,
763 struct rxe_pkt_info *pkt)
765 struct sk_buff *skb = PKT_TO_SKB(pkt);
767 memset(hdr, 0, sizeof(*hdr));
768 if (skb->protocol == htons(ETH_P_IP))
769 memcpy(&hdr->roce4grh, ip_hdr(skb), sizeof(hdr->roce4grh));
770 else if (skb->protocol == htons(ETH_P_IPV6))
771 memcpy(&hdr->ibgrh, ipv6_hdr(skb), sizeof(hdr->ibgrh));
774 /* Executes a new request. A retried request never reach that function (send
775 * and writes are discarded, and reads and atomics are retried elsewhere.
777 static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt)
779 enum resp_states err;
781 if (pkt->mask & RXE_SEND_MASK) {
782 if (qp_type(qp) == IB_QPT_UD ||
783 qp_type(qp) == IB_QPT_SMI ||
784 qp_type(qp) == IB_QPT_GSI) {
785 union rdma_network_hdr hdr;
787 build_rdma_network_hdr(&hdr, pkt);
789 err = send_data_in(qp, &hdr, sizeof(hdr));
793 err = send_data_in(qp, payload_addr(pkt), payload_size(pkt));
796 } else if (pkt->mask & RXE_WRITE_MASK) {
797 err = write_data_in(qp, pkt);
800 } else if (pkt->mask & RXE_READ_MASK) {
801 /* For RDMA Read we can increment the msn now. See C9-148. */
803 return RESPST_READ_REPLY;
804 } else if (pkt->mask & RXE_ATOMIC_MASK) {
805 err = process_atomic(qp, pkt);
813 /* next expected psn, read handles this separately */
814 qp->resp.psn = (pkt->psn + 1) & BTH_PSN_MASK;
815 qp->resp.ack_psn = qp->resp.psn;
817 qp->resp.opcode = pkt->opcode;
818 qp->resp.status = IB_WC_SUCCESS;
820 if (pkt->mask & RXE_COMP_MASK) {
821 /* We successfully processed this new request. */
823 return RESPST_COMPLETE;
824 } else if (qp_type(qp) == IB_QPT_RC)
825 return RESPST_ACKNOWLEDGE;
827 return RESPST_CLEANUP;
830 static enum resp_states do_complete(struct rxe_qp *qp,
831 struct rxe_pkt_info *pkt)
834 struct ib_wc *wc = &cqe.ibwc;
835 struct ib_uverbs_wc *uwc = &cqe.uibwc;
836 struct rxe_recv_wqe *wqe = qp->resp.wqe;
837 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
840 return RESPST_CLEANUP;
842 memset(&cqe, 0, sizeof(cqe));
844 if (qp->rcq->is_user) {
845 uwc->status = qp->resp.status;
846 uwc->qp_num = qp->ibqp.qp_num;
847 uwc->wr_id = wqe->wr_id;
849 wc->status = qp->resp.status;
851 wc->wr_id = wqe->wr_id;
854 if (wc->status == IB_WC_SUCCESS) {
855 rxe_counter_inc(rxe, RXE_CNT_RDMA_RECV);
856 wc->opcode = (pkt->mask & RXE_IMMDT_MASK &&
857 pkt->mask & RXE_WRITE_MASK) ?
858 IB_WC_RECV_RDMA_WITH_IMM : IB_WC_RECV;
860 wc->byte_len = (pkt->mask & RXE_IMMDT_MASK &&
861 pkt->mask & RXE_WRITE_MASK) ?
862 qp->resp.length : wqe->dma.length - wqe->dma.resid;
864 /* fields after byte_len are different between kernel and user
867 if (qp->rcq->is_user) {
868 uwc->wc_flags = IB_WC_GRH;
870 if (pkt->mask & RXE_IMMDT_MASK) {
871 uwc->wc_flags |= IB_WC_WITH_IMM;
872 uwc->ex.imm_data = immdt_imm(pkt);
875 if (pkt->mask & RXE_IETH_MASK) {
876 uwc->wc_flags |= IB_WC_WITH_INVALIDATE;
877 uwc->ex.invalidate_rkey = ieth_rkey(pkt);
880 uwc->qp_num = qp->ibqp.qp_num;
882 if (pkt->mask & RXE_DETH_MASK)
883 uwc->src_qp = deth_sqp(pkt);
885 uwc->port_num = qp->attr.port_num;
887 struct sk_buff *skb = PKT_TO_SKB(pkt);
889 wc->wc_flags = IB_WC_GRH | IB_WC_WITH_NETWORK_HDR_TYPE;
890 if (skb->protocol == htons(ETH_P_IP))
891 wc->network_hdr_type = RDMA_NETWORK_IPV4;
893 wc->network_hdr_type = RDMA_NETWORK_IPV6;
895 if (is_vlan_dev(skb->dev)) {
896 wc->wc_flags |= IB_WC_WITH_VLAN;
897 wc->vlan_id = vlan_dev_vlan_id(skb->dev);
900 if (pkt->mask & RXE_IMMDT_MASK) {
901 wc->wc_flags |= IB_WC_WITH_IMM;
902 wc->ex.imm_data = immdt_imm(pkt);
905 if (pkt->mask & RXE_IETH_MASK) {
908 wc->wc_flags |= IB_WC_WITH_INVALIDATE;
909 wc->ex.invalidate_rkey = ieth_rkey(pkt);
911 rmr = rxe_pool_get_index(&rxe->mr_pool,
912 wc->ex.invalidate_rkey >> 8);
913 if (unlikely(!rmr)) {
914 pr_err("Bad rkey %#x invalidation\n",
915 wc->ex.invalidate_rkey);
918 rmr->state = RXE_MEM_STATE_FREE;
924 if (pkt->mask & RXE_DETH_MASK)
925 wc->src_qp = deth_sqp(pkt);
927 wc->port_num = qp->attr.port_num;
931 /* have copy for srq and reference for !srq */
933 advance_consumer(qp->rq.queue);
937 if (rxe_cq_post(qp->rcq, &cqe, pkt ? bth_se(pkt) : 1))
938 return RESPST_ERR_CQ_OVERFLOW;
940 if (qp->resp.state == QP_STATE_ERROR)
941 return RESPST_CHK_RESOURCE;
945 else if (qp_type(qp) == IB_QPT_RC)
946 return RESPST_ACKNOWLEDGE;
948 return RESPST_CLEANUP;
951 static int send_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
952 u8 syndrome, u32 psn)
955 struct rxe_pkt_info ack_pkt;
958 skb = prepare_ack_packet(qp, pkt, &ack_pkt, IB_OPCODE_RC_ACKNOWLEDGE,
959 0, psn, syndrome, NULL);
965 err = rxe_xmit_packet(qp, &ack_pkt, skb);
967 pr_err_ratelimited("Failed sending ack\n");
973 static int send_atomic_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
977 struct rxe_pkt_info ack_pkt;
979 struct resp_res *res;
981 skb = prepare_ack_packet(qp, pkt, &ack_pkt,
982 IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE, 0, pkt->psn,
991 res = &qp->resp.resources[qp->resp.res_head];
992 free_rd_atomic_resource(qp, res);
993 rxe_advance_resp_resource(qp);
995 memcpy(SKB_TO_PKT(skb), &ack_pkt, sizeof(ack_pkt));
996 memset((unsigned char *)SKB_TO_PKT(skb) + sizeof(ack_pkt), 0,
997 sizeof(skb->cb) - sizeof(ack_pkt));
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(qp, &ack_pkt, skb);
1008 pr_err_ratelimited("Failed sending ack\n");
1015 static enum resp_states acknowledge(struct rxe_qp *qp,
1016 struct rxe_pkt_info *pkt)
1018 if (qp_type(qp) != IB_QPT_RC)
1019 return RESPST_CLEANUP;
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);
1028 return RESPST_CLEANUP;
1031 static enum resp_states cleanup(struct rxe_qp *qp,
1032 struct rxe_pkt_info *pkt)
1034 struct sk_buff *skb;
1037 skb = skb_dequeue(&qp->req_pkts);
1043 rxe_drop_ref(qp->resp.mr);
1050 static struct resp_res *find_resource(struct rxe_qp *qp, u32 psn)
1054 for (i = 0; i < qp->attr.max_dest_rd_atomic; i++) {
1055 struct resp_res *res = &qp->resp.resources[i];
1060 if (psn_compare(psn, res->first_psn) >= 0 &&
1061 psn_compare(psn, res->last_psn) <= 0) {
1069 static enum resp_states duplicate_request(struct rxe_qp *qp,
1070 struct rxe_pkt_info *pkt)
1072 enum resp_states rc;
1073 u32 prev_psn = (qp->resp.ack_psn - 1) & BTH_PSN_MASK;
1075 if (pkt->mask & RXE_SEND_MASK ||
1076 pkt->mask & RXE_WRITE_MASK) {
1077 /* SEND. Ack again and cleanup. C9-105. */
1079 send_ack(qp, pkt, AETH_ACK_UNLIMITED, prev_psn);
1080 rc = RESPST_CLEANUP;
1082 } else if (pkt->mask & RXE_READ_MASK) {
1083 struct resp_res *res;
1085 res = find_resource(qp, pkt->psn);
1087 /* Resource not found. Class D error. Drop the
1090 rc = RESPST_CLEANUP;
1093 /* Ensure this new request is the same as the previous
1094 * one or a subset of it.
1096 u64 iova = reth_va(pkt);
1097 u32 resid = reth_len(pkt);
1099 if (iova < res->read.va_org ||
1100 resid > res->read.length ||
1101 (iova + resid) > (res->read.va_org +
1102 res->read.length)) {
1103 rc = RESPST_CLEANUP;
1107 if (reth_rkey(pkt) != res->read.rkey) {
1108 rc = RESPST_CLEANUP;
1112 res->cur_psn = pkt->psn;
1113 res->state = (pkt->psn == res->first_psn) ?
1114 rdatm_res_state_new :
1115 rdatm_res_state_replay;
1118 /* Reset the resource, except length. */
1119 res->read.va_org = iova;
1120 res->read.va = iova;
1121 res->read.resid = resid;
1123 /* Replay the RDMA read reply. */
1125 rc = RESPST_READ_REPLY;
1129 struct resp_res *res;
1131 /* Find the operation in our list of responder resources. */
1132 res = find_resource(qp, pkt->psn);
1134 skb_get(res->atomic.skb);
1135 /* Resend the result. */
1136 rc = rxe_xmit_packet(qp, pkt, res->atomic.skb);
1138 pr_err("Failed resending result. This flow is not handled - skb ignored\n");
1139 rc = RESPST_CLEANUP;
1144 /* Resource not found. Class D error. Drop the request. */
1145 rc = RESPST_CLEANUP;
1152 /* Process a class A or C. Both are treated the same in this implementation. */
1153 static void do_class_ac_error(struct rxe_qp *qp, u8 syndrome,
1154 enum ib_wc_status status)
1156 qp->resp.aeth_syndrome = syndrome;
1157 qp->resp.status = status;
1159 /* indicate that we should go through the ERROR state */
1160 qp->resp.goto_error = 1;
1163 static enum resp_states do_class_d1e_error(struct rxe_qp *qp)
1168 qp->resp.drop_msg = 1;
1170 qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1171 return RESPST_COMPLETE;
1173 return RESPST_CLEANUP;
1176 /* Class D1. This packet may be the start of a
1177 * new message and could be valid. The previous
1178 * message is invalid and ignored. reset the
1179 * recv wr to its original state
1182 qp->resp.wqe->dma.resid = qp->resp.wqe->dma.length;
1183 qp->resp.wqe->dma.cur_sge = 0;
1184 qp->resp.wqe->dma.sge_offset = 0;
1185 qp->resp.opcode = -1;
1189 rxe_drop_ref(qp->resp.mr);
1193 return RESPST_CLEANUP;
1197 static void rxe_drain_req_pkts(struct rxe_qp *qp, bool notify)
1199 struct sk_buff *skb;
1201 while ((skb = skb_dequeue(&qp->req_pkts))) {
1209 while (!qp->srq && qp->rq.queue && queue_head(qp->rq.queue))
1210 advance_consumer(qp->rq.queue);
1213 int rxe_responder(void *arg)
1215 struct rxe_qp *qp = (struct rxe_qp *)arg;
1216 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
1217 enum resp_states state;
1218 struct rxe_pkt_info *pkt = NULL;
1223 qp->resp.aeth_syndrome = AETH_ACK_UNLIMITED;
1230 switch (qp->resp.state) {
1231 case QP_STATE_RESET:
1232 state = RESPST_RESET;
1236 state = RESPST_GET_REQ;
1241 pr_debug("qp#%d state = %s\n", qp_num(qp),
1242 resp_state_name[state]);
1244 case RESPST_GET_REQ:
1245 state = get_req(qp, &pkt);
1247 case RESPST_CHK_PSN:
1248 state = check_psn(qp, pkt);
1250 case RESPST_CHK_OP_SEQ:
1251 state = check_op_seq(qp, pkt);
1253 case RESPST_CHK_OP_VALID:
1254 state = check_op_valid(qp, pkt);
1256 case RESPST_CHK_RESOURCE:
1257 state = check_resource(qp, pkt);
1259 case RESPST_CHK_LENGTH:
1260 state = check_length(qp, pkt);
1262 case RESPST_CHK_RKEY:
1263 state = check_rkey(qp, pkt);
1265 case RESPST_EXECUTE:
1266 state = execute(qp, pkt);
1268 case RESPST_COMPLETE:
1269 state = do_complete(qp, pkt);
1271 case RESPST_READ_REPLY:
1272 state = read_reply(qp, pkt);
1274 case RESPST_ACKNOWLEDGE:
1275 state = acknowledge(qp, pkt);
1277 case RESPST_CLEANUP:
1278 state = cleanup(qp, pkt);
1280 case RESPST_DUPLICATE_REQUEST:
1281 state = duplicate_request(qp, pkt);
1283 case RESPST_ERR_PSN_OUT_OF_SEQ:
1284 /* RC only - Class B. Drop packet. */
1285 send_ack(qp, pkt, AETH_NAK_PSN_SEQ_ERROR, qp->resp.psn);
1286 state = RESPST_CLEANUP;
1289 case RESPST_ERR_TOO_MANY_RDMA_ATM_REQ:
1290 case RESPST_ERR_MISSING_OPCODE_FIRST:
1291 case RESPST_ERR_MISSING_OPCODE_LAST_C:
1292 case RESPST_ERR_UNSUPPORTED_OPCODE:
1293 case RESPST_ERR_MISALIGNED_ATOMIC:
1294 /* RC Only - Class C. */
1295 do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1296 IB_WC_REM_INV_REQ_ERR);
1297 state = RESPST_COMPLETE;
1300 case RESPST_ERR_MISSING_OPCODE_LAST_D1E:
1301 state = do_class_d1e_error(qp);
1303 case RESPST_ERR_RNR:
1304 if (qp_type(qp) == IB_QPT_RC) {
1305 rxe_counter_inc(rxe, RXE_CNT_SND_RNR);
1307 send_ack(qp, pkt, AETH_RNR_NAK |
1309 qp->attr.min_rnr_timer),
1312 /* UD/UC - class D */
1313 qp->resp.drop_msg = 1;
1315 state = RESPST_CLEANUP;
1318 case RESPST_ERR_RKEY_VIOLATION:
1319 if (qp_type(qp) == IB_QPT_RC) {
1321 do_class_ac_error(qp, AETH_NAK_REM_ACC_ERR,
1322 IB_WC_REM_ACCESS_ERR);
1323 state = RESPST_COMPLETE;
1325 qp->resp.drop_msg = 1;
1327 /* UC/SRQ Class D */
1328 qp->resp.status = IB_WC_REM_ACCESS_ERR;
1329 state = RESPST_COMPLETE;
1331 /* UC/non-SRQ Class E. */
1332 state = RESPST_CLEANUP;
1337 case RESPST_ERR_LENGTH:
1338 if (qp_type(qp) == IB_QPT_RC) {
1340 do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1341 IB_WC_REM_INV_REQ_ERR);
1342 state = RESPST_COMPLETE;
1343 } else if (qp->srq) {
1344 /* UC/UD - class E */
1345 qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1346 state = RESPST_COMPLETE;
1348 /* UC/UD - class D */
1349 qp->resp.drop_msg = 1;
1350 state = RESPST_CLEANUP;
1354 case RESPST_ERR_MALFORMED_WQE:
1356 do_class_ac_error(qp, AETH_NAK_REM_OP_ERR,
1357 IB_WC_LOC_QP_OP_ERR);
1358 state = RESPST_COMPLETE;
1361 case RESPST_ERR_CQ_OVERFLOW:
1363 state = RESPST_ERROR;
1367 if (qp->resp.goto_error) {
1368 state = RESPST_ERROR;
1375 if (qp->resp.goto_error) {
1376 state = RESPST_ERROR;
1383 rxe_drain_req_pkts(qp, false);
1384 qp->resp.wqe = NULL;
1388 qp->resp.goto_error = 0;
1389 pr_warn("qp#%d moved to error state\n", qp_num(qp));