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rxe: fix error completion wr_id and qp_num
[linux/fpc-iii.git] / drivers / infiniband / sw / rxe / rxe_resp.c
blob4111b798fd3c9ab7e749675140690270b9cac46c
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 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
153
154 switch (qp_type(qp)) {
155 case IB_QPT_RC:
156 if (diff > 0) {
157 if (qp->resp.sent_psn_nak)
158 return RESPST_CLEANUP;
159
160 qp->resp.sent_psn_nak = 1;
161 rxe_counter_inc(rxe, RXE_CNT_OUT_OF_SEQ_REQ);
162 return RESPST_ERR_PSN_OUT_OF_SEQ;
163
164 } else if (diff < 0) {
165 rxe_counter_inc(rxe, RXE_CNT_DUP_REQ);
166 return RESPST_DUPLICATE_REQUEST;
167 }
168
169 if (qp->resp.sent_psn_nak)
170 qp->resp.sent_psn_nak = 0;
171
172 break;
173
174 case IB_QPT_UC:
175 if (qp->resp.drop_msg || diff != 0) {
176 if (pkt->mask & RXE_START_MASK) {
177 qp->resp.drop_msg = 0;
178 return RESPST_CHK_OP_SEQ;
179 }
180
181 qp->resp.drop_msg = 1;
182 return RESPST_CLEANUP;
183 }
184 break;
185 default:
186 break;
187 }
188
189 return RESPST_CHK_OP_SEQ;
190 }
191
192 static enum resp_states check_op_seq(struct rxe_qp *qp,
193 struct rxe_pkt_info *pkt)
194 {
195 switch (qp_type(qp)) {
196 case IB_QPT_RC:
197 switch (qp->resp.opcode) {
198 case IB_OPCODE_RC_SEND_FIRST:
199 case IB_OPCODE_RC_SEND_MIDDLE:
200 switch (pkt->opcode) {
201 case IB_OPCODE_RC_SEND_MIDDLE:
202 case IB_OPCODE_RC_SEND_LAST:
203 case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE:
204 case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE:
205 return RESPST_CHK_OP_VALID;
206 default:
207 return RESPST_ERR_MISSING_OPCODE_LAST_C;
208 }
209
210 case IB_OPCODE_RC_RDMA_WRITE_FIRST:
211 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
212 switch (pkt->opcode) {
213 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
214 case IB_OPCODE_RC_RDMA_WRITE_LAST:
215 case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
216 return RESPST_CHK_OP_VALID;
217 default:
218 return RESPST_ERR_MISSING_OPCODE_LAST_C;
219 }
220
221 default:
222 switch (pkt->opcode) {
223 case IB_OPCODE_RC_SEND_MIDDLE:
224 case IB_OPCODE_RC_SEND_LAST:
225 case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE:
226 case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE:
227 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
228 case IB_OPCODE_RC_RDMA_WRITE_LAST:
229 case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
230 return RESPST_ERR_MISSING_OPCODE_FIRST;
231 default:
232 return RESPST_CHK_OP_VALID;
233 }
234 }
235 break;
236
237 case IB_QPT_UC:
238 switch (qp->resp.opcode) {
239 case IB_OPCODE_UC_SEND_FIRST:
240 case IB_OPCODE_UC_SEND_MIDDLE:
241 switch (pkt->opcode) {
242 case IB_OPCODE_UC_SEND_MIDDLE:
243 case IB_OPCODE_UC_SEND_LAST:
244 case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE:
245 return RESPST_CHK_OP_VALID;
246 default:
247 return RESPST_ERR_MISSING_OPCODE_LAST_D1E;
248 }
249
250 case IB_OPCODE_UC_RDMA_WRITE_FIRST:
251 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
252 switch (pkt->opcode) {
253 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
254 case IB_OPCODE_UC_RDMA_WRITE_LAST:
255 case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
256 return RESPST_CHK_OP_VALID;
257 default:
258 return RESPST_ERR_MISSING_OPCODE_LAST_D1E;
259 }
260
261 default:
262 switch (pkt->opcode) {
263 case IB_OPCODE_UC_SEND_MIDDLE:
264 case IB_OPCODE_UC_SEND_LAST:
265 case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE:
266 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
267 case IB_OPCODE_UC_RDMA_WRITE_LAST:
268 case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
269 qp->resp.drop_msg = 1;
270 return RESPST_CLEANUP;
271 default:
272 return RESPST_CHK_OP_VALID;
273 }
274 }
275 break;
276
277 default:
278 return RESPST_CHK_OP_VALID;
279 }
280 }
281
282 static enum resp_states check_op_valid(struct rxe_qp *qp,
283 struct rxe_pkt_info *pkt)
284 {
285 switch (qp_type(qp)) {
286 case IB_QPT_RC:
287 if (((pkt->mask & RXE_READ_MASK) &&
288 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_READ)) ||
289 ((pkt->mask & RXE_WRITE_MASK) &&
290 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) ||
291 ((pkt->mask & RXE_ATOMIC_MASK) &&
292 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) {
293 return RESPST_ERR_UNSUPPORTED_OPCODE;
294 }
295
296 break;
297
298 case IB_QPT_UC:
299 if ((pkt->mask & RXE_WRITE_MASK) &&
300 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) {
301 qp->resp.drop_msg = 1;
302 return RESPST_CLEANUP;
303 }
304
305 break;
306
307 case IB_QPT_UD:
308 case IB_QPT_SMI:
309 case IB_QPT_GSI:
310 break;
311
312 default:
313 WARN_ON_ONCE(1);
314 break;
315 }
316
317 return RESPST_CHK_RESOURCE;
318 }
319
320 static enum resp_states get_srq_wqe(struct rxe_qp *qp)
321 {
322 struct rxe_srq *srq = qp->srq;
323 struct rxe_queue *q = srq->rq.queue;
324 struct rxe_recv_wqe *wqe;
325 struct ib_event ev;
326
327 if (srq->error)
328 return RESPST_ERR_RNR;
329
330 spin_lock_bh(&srq->rq.consumer_lock);
331
332 wqe = queue_head(q);
333 if (!wqe) {
334 spin_unlock_bh(&srq->rq.consumer_lock);
335 return RESPST_ERR_RNR;
336 }
337
338 /* note kernel and user space recv wqes have same size */
339 memcpy(&qp->resp.srq_wqe, wqe, sizeof(qp->resp.srq_wqe));
340
341 qp->resp.wqe = &qp->resp.srq_wqe.wqe;
342 advance_consumer(q);
343
344 if (srq->limit && srq->ibsrq.event_handler &&
345 (queue_count(q) < srq->limit)) {
346 srq->limit = 0;
347 goto event;
348 }
349
350 spin_unlock_bh(&srq->rq.consumer_lock);
351 return RESPST_CHK_LENGTH;
352
353 event:
354 spin_unlock_bh(&srq->rq.consumer_lock);
355 ev.device = qp->ibqp.device;
356 ev.element.srq = qp->ibqp.srq;
357 ev.event = IB_EVENT_SRQ_LIMIT_REACHED;
358 srq->ibsrq.event_handler(&ev, srq->ibsrq.srq_context);
359 return RESPST_CHK_LENGTH;
360 }
361
362 static enum resp_states check_resource(struct rxe_qp *qp,
363 struct rxe_pkt_info *pkt)
364 {
365 struct rxe_srq *srq = qp->srq;
366
367 if (qp->resp.state == QP_STATE_ERROR) {
368 if (qp->resp.wqe) {
369 qp->resp.status = IB_WC_WR_FLUSH_ERR;
370 return RESPST_COMPLETE;
371 } else if (!srq) {
372 qp->resp.wqe = queue_head(qp->rq.queue);
373 if (qp->resp.wqe) {
374 qp->resp.status = IB_WC_WR_FLUSH_ERR;
375 return RESPST_COMPLETE;
376 } else {
377 return RESPST_EXIT;
378 }
379 } else {
380 return RESPST_EXIT;
381 }
382 }
383
384 if (pkt->mask & RXE_READ_OR_ATOMIC) {
385 /* it is the requesters job to not send
386 * too many read/atomic ops, we just
387 * recycle the responder resource queue
388 */
389 if (likely(qp->attr.max_dest_rd_atomic > 0))
390 return RESPST_CHK_LENGTH;
391 else
392 return RESPST_ERR_TOO_MANY_RDMA_ATM_REQ;
393 }
394
395 if (pkt->mask & RXE_RWR_MASK) {
396 if (srq)
397 return get_srq_wqe(qp);
398
399 qp->resp.wqe = queue_head(qp->rq.queue);
400 return (qp->resp.wqe) ? RESPST_CHK_LENGTH : RESPST_ERR_RNR;
401 }
402
403 return RESPST_CHK_LENGTH;
404 }
405
406 static enum resp_states check_length(struct rxe_qp *qp,
407 struct rxe_pkt_info *pkt)
408 {
409 switch (qp_type(qp)) {
410 case IB_QPT_RC:
411 return RESPST_CHK_RKEY;
412
413 case IB_QPT_UC:
414 return RESPST_CHK_RKEY;
415
416 default:
417 return RESPST_CHK_RKEY;
418 }
419 }
420
421 static enum resp_states check_rkey(struct rxe_qp *qp,
422 struct rxe_pkt_info *pkt)
423 {
424 struct rxe_mem *mem = NULL;
425 u64 va;
426 u32 rkey;
427 u32 resid;
428 u32 pktlen;
429 int mtu = qp->mtu;
430 enum resp_states state;
431 int access;
432
433 if (pkt->mask & (RXE_READ_MASK | RXE_WRITE_MASK)) {
434 if (pkt->mask & RXE_RETH_MASK) {
435 qp->resp.va = reth_va(pkt);
436 qp->resp.rkey = reth_rkey(pkt);
437 qp->resp.resid = reth_len(pkt);
438 }
439 access = (pkt->mask & RXE_READ_MASK) ? IB_ACCESS_REMOTE_READ
440 : IB_ACCESS_REMOTE_WRITE;
441 } else if (pkt->mask & RXE_ATOMIC_MASK) {
442 qp->resp.va = atmeth_va(pkt);
443 qp->resp.rkey = atmeth_rkey(pkt);
444 qp->resp.resid = sizeof(u64);
445 access = IB_ACCESS_REMOTE_ATOMIC;
446 } else {
447 return RESPST_EXECUTE;
448 }
449
450 /* A zero-byte op is not required to set an addr or rkey. */
451 if ((pkt->mask & (RXE_READ_MASK | RXE_WRITE_OR_SEND)) &&
452 (pkt->mask & RXE_RETH_MASK) &&
453 reth_len(pkt) == 0) {
454 return RESPST_EXECUTE;
455 }
456
457 va = qp->resp.va;
458 rkey = qp->resp.rkey;
459 resid = qp->resp.resid;
460 pktlen = payload_size(pkt);
461
462 mem = lookup_mem(qp->pd, access, rkey, lookup_remote);
463 if (!mem) {
464 state = RESPST_ERR_RKEY_VIOLATION;
465 goto err;
466 }
467
468 if (unlikely(mem->state == RXE_MEM_STATE_FREE)) {
469 state = RESPST_ERR_RKEY_VIOLATION;
470 goto err;
471 }
472
473 if (mem_check_range(mem, va, resid)) {
474 state = RESPST_ERR_RKEY_VIOLATION;
475 goto err;
476 }
477
478 if (pkt->mask & RXE_WRITE_MASK) {
479 if (resid > mtu) {
480 if (pktlen != mtu || bth_pad(pkt)) {
481 state = RESPST_ERR_LENGTH;
482 goto err;
483 }
484 } else {
485 if (pktlen != resid) {
486 state = RESPST_ERR_LENGTH;
487 goto err;
488 }
489 if ((bth_pad(pkt) != (0x3 & (-resid)))) {
490 /* This case may not be exactly that
491 * but nothing else fits.
492 */
493 state = RESPST_ERR_LENGTH;
494 goto err;
495 }
496 }
497 }
498
499 WARN_ON_ONCE(qp->resp.mr);
500
501 qp->resp.mr = mem;
502 return RESPST_EXECUTE;
503
504 err:
505 if (mem)
506 rxe_drop_ref(mem);
507 return state;
508 }
509
510 static enum resp_states send_data_in(struct rxe_qp *qp, void *data_addr,
511 int data_len)
512 {
513 int err;
514
515 err = copy_data(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_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_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 res->replay = 0;
686
687 res->read.va = qp->resp.va;
688 res->read.va_org = qp->resp.va;
689
690 res->first_psn = req_pkt->psn;
691
692 if (reth_len(req_pkt)) {
693 res->last_psn = (req_pkt->psn +
694 (reth_len(req_pkt) + mtu - 1) /
695 mtu - 1) & BTH_PSN_MASK;
696 } else {
697 res->last_psn = res->first_psn;
698 }
699 res->cur_psn = req_pkt->psn;
700
701 res->read.resid = qp->resp.resid;
702 res->read.length = qp->resp.resid;
703 res->read.rkey = qp->resp.rkey;
704
705 /* note res inherits the reference to mr from qp */
706 res->read.mr = qp->resp.mr;
707 qp->resp.mr = NULL;
708
709 qp->resp.res = res;
710 res->state = rdatm_res_state_new;
711 }
712
713 if (res->state == rdatm_res_state_new) {
714 if (res->read.resid <= mtu)
715 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_ONLY;
716 else
717 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST;
718 } else {
719 if (res->read.resid > mtu)
720 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE;
721 else
722 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_LAST;
723 }
724
725 res->state = rdatm_res_state_next;
726
727 payload = min_t(int, res->read.resid, mtu);
728
729 skb = prepare_ack_packet(qp, req_pkt, &ack_pkt, opcode, payload,
730 res->cur_psn, AETH_ACK_UNLIMITED, &icrc);
731 if (!skb)
732 return RESPST_ERR_RNR;
733
734 err = rxe_mem_copy(res->read.mr, res->read.va, payload_addr(&ack_pkt),
735 payload, from_mem_obj, &icrc);
736 if (err)
737 pr_err("Failed copying memory\n");
738
739 p = payload_addr(&ack_pkt) + payload + bth_pad(&ack_pkt);
740 *p = ~icrc;
741
742 err = rxe_xmit_packet(rxe, qp, &ack_pkt, skb);
743 if (err) {
744 pr_err("Failed sending RDMA reply.\n");
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 if (!res->replay)
757 qp->resp.opcode = -1;
758 if (psn_compare(res->cur_psn, qp->resp.psn) >= 0)
759 qp->resp.psn = res->cur_psn;
760 state = RESPST_CLEANUP;
761 }
762
763 return state;
764 }
765
766 static void build_rdma_network_hdr(union rdma_network_hdr *hdr,
767 struct rxe_pkt_info *pkt)
768 {
769 struct sk_buff *skb = PKT_TO_SKB(pkt);
770
771 memset(hdr, 0, sizeof(*hdr));
772 if (skb->protocol == htons(ETH_P_IP))
773 memcpy(&hdr->roce4grh, ip_hdr(skb), sizeof(hdr->roce4grh));
774 else if (skb->protocol == htons(ETH_P_IPV6))
775 memcpy(&hdr->ibgrh, ipv6_hdr(skb), sizeof(hdr->ibgrh));
776 }
777
778 /* Executes a new request. A retried request never reach that function (send
779 * and writes are discarded, and reads and atomics are retried elsewhere.
780 */
781 static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt)
782 {
783 enum resp_states err;
784
785 if (pkt->mask & RXE_SEND_MASK) {
786 if (qp_type(qp) == IB_QPT_UD ||
787 qp_type(qp) == IB_QPT_SMI ||
788 qp_type(qp) == IB_QPT_GSI) {
789 union rdma_network_hdr hdr;
790
791 build_rdma_network_hdr(&hdr, pkt);
792
793 err = send_data_in(qp, &hdr, sizeof(hdr));
794 if (err)
795 return err;
796 }
797 err = send_data_in(qp, payload_addr(pkt), payload_size(pkt));
798 if (err)
799 return err;
800 } else if (pkt->mask & RXE_WRITE_MASK) {
801 err = write_data_in(qp, pkt);
802 if (err)
803 return err;
804 } else if (pkt->mask & RXE_READ_MASK) {
805 /* For RDMA Read we can increment the msn now. See C9-148. */
806 qp->resp.msn++;
807 return RESPST_READ_REPLY;
808 } else if (pkt->mask & RXE_ATOMIC_MASK) {
809 err = process_atomic(qp, pkt);
810 if (err)
811 return err;
812 } else {
813 /* Unreachable */
814 WARN_ON_ONCE(1);
815 }
816
817 /* next expected psn, read handles this separately */
818 qp->resp.psn = (pkt->psn + 1) & BTH_PSN_MASK;
819 qp->resp.ack_psn = qp->resp.psn;
820
821 qp->resp.opcode = pkt->opcode;
822 qp->resp.status = IB_WC_SUCCESS;
823
824 if (pkt->mask & RXE_COMP_MASK) {
825 /* We successfully processed this new request. */
826 qp->resp.msn++;
827 return RESPST_COMPLETE;
828 } else if (qp_type(qp) == IB_QPT_RC)
829 return RESPST_ACKNOWLEDGE;
830 else
831 return RESPST_CLEANUP;
832 }
833
834 static enum resp_states do_complete(struct rxe_qp *qp,
835 struct rxe_pkt_info *pkt)
836 {
837 struct rxe_cqe cqe;
838 struct ib_wc *wc = &cqe.ibwc;
839 struct ib_uverbs_wc *uwc = &cqe.uibwc;
840 struct rxe_recv_wqe *wqe = qp->resp.wqe;
841
842 if (unlikely(!wqe))
843 return RESPST_CLEANUP;
844
845 memset(&cqe, 0, sizeof(cqe));
846
847 if (qp->rcq->is_user) {
848 uwc->status = qp->resp.status;
849 uwc->qp_num = qp->ibqp.qp_num;
850 uwc->wr_id = wqe->wr_id;
851 } else {
852 wc->status = qp->resp.status;
853 wc->qp = &qp->ibqp;
854 wc->wr_id = wqe->wr_id;
855 }
856
857 if (wc->status == IB_WC_SUCCESS) {
858 wc->opcode = (pkt->mask & RXE_IMMDT_MASK &&
859 pkt->mask & RXE_WRITE_MASK) ?
860 IB_WC_RECV_RDMA_WITH_IMM : IB_WC_RECV;
861 wc->vendor_err = 0;
862 wc->byte_len = wqe->dma.length - wqe->dma.resid;
863
864 /* fields after byte_len are different between kernel and user
865 * space
866 */
867 if (qp->rcq->is_user) {
868 uwc->wc_flags = IB_WC_GRH;
869
870 if (pkt->mask & RXE_IMMDT_MASK) {
871 uwc->wc_flags |= IB_WC_WITH_IMM;
872 uwc->ex.imm_data = immdt_imm(pkt);
873 }
874
875 if (pkt->mask & RXE_IETH_MASK) {
876 uwc->wc_flags |= IB_WC_WITH_INVALIDATE;
877 uwc->ex.invalidate_rkey = ieth_rkey(pkt);
878 }
879
880 uwc->qp_num = qp->ibqp.qp_num;
881
882 if (pkt->mask & RXE_DETH_MASK)
883 uwc->src_qp = deth_sqp(pkt);
884
885 uwc->port_num = qp->attr.port_num;
886 } else {
887 struct sk_buff *skb = PKT_TO_SKB(pkt);
888
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;
892 else
893 wc->network_hdr_type = RDMA_NETWORK_IPV6;
894
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);
898 }
899
900 if (pkt->mask & RXE_IMMDT_MASK) {
901 wc->wc_flags |= IB_WC_WITH_IMM;
902 wc->ex.imm_data = immdt_imm(pkt);
903 }
904
905 if (pkt->mask & RXE_IETH_MASK) {
906 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
907 struct rxe_mem *rmr;
908
909 wc->wc_flags |= IB_WC_WITH_INVALIDATE;
910 wc->ex.invalidate_rkey = ieth_rkey(pkt);
911
912 rmr = rxe_pool_get_index(&rxe->mr_pool,
913 wc->ex.invalidate_rkey >> 8);
914 if (unlikely(!rmr)) {
915 pr_err("Bad rkey %#x invalidation\n",
916 wc->ex.invalidate_rkey);
917 return RESPST_ERROR;
918 }
919 rmr->state = RXE_MEM_STATE_FREE;
920 rxe_drop_ref(rmr);
921 }
922
923 wc->qp = &qp->ibqp;
924
925 if (pkt->mask & RXE_DETH_MASK)
926 wc->src_qp = deth_sqp(pkt);
927
928 wc->port_num = qp->attr.port_num;
929 }
930 }
931
932 /* have copy for srq and reference for !srq */
933 if (!qp->srq)
934 advance_consumer(qp->rq.queue);
935
936 qp->resp.wqe = NULL;
937
938 if (rxe_cq_post(qp->rcq, &cqe, pkt ? bth_se(pkt) : 1))
939 return RESPST_ERR_CQ_OVERFLOW;
940
941 if (qp->resp.state == QP_STATE_ERROR)
942 return RESPST_CHK_RESOURCE;
943
944 if (!pkt)
945 return RESPST_DONE;
946 else if (qp_type(qp) == IB_QPT_RC)
947 return RESPST_ACKNOWLEDGE;
948 else
949 return RESPST_CLEANUP;
950 }
951
952 static int send_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
953 u8 syndrome, u32 psn)
954 {
955 int err = 0;
956 struct rxe_pkt_info ack_pkt;
957 struct sk_buff *skb;
958 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
959
960 skb = prepare_ack_packet(qp, pkt, &ack_pkt, IB_OPCODE_RC_ACKNOWLEDGE,
961 0, psn, syndrome, NULL);
962 if (!skb) {
963 err = -ENOMEM;
964 goto err1;
965 }
966
967 err = rxe_xmit_packet(rxe, qp, &ack_pkt, skb);
968 if (err)
969 pr_err_ratelimited("Failed sending ack\n");
970
971 err1:
972 return err;
973 }
974
975 static int send_atomic_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
976 u8 syndrome)
977 {
978 int rc = 0;
979 struct rxe_pkt_info ack_pkt;
980 struct sk_buff *skb;
981 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
982 struct resp_res *res;
983
984 skb = prepare_ack_packet(qp, pkt, &ack_pkt,
985 IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE, 0, pkt->psn,
986 syndrome, NULL);
987 if (!skb) {
988 rc = -ENOMEM;
989 goto out;
990 }
991
992 rxe_add_ref(qp);
993
994 res = &qp->resp.resources[qp->resp.res_head];
995 free_rd_atomic_resource(qp, res);
996 rxe_advance_resp_resource(qp);
997
998 memcpy(SKB_TO_PKT(skb), &ack_pkt, sizeof(ack_pkt));
999 memset((unsigned char *)SKB_TO_PKT(skb) + sizeof(ack_pkt), 0,
1000 sizeof(skb->cb) - sizeof(ack_pkt));
1001
1002 skb_get(skb);
1003 res->type = RXE_ATOMIC_MASK;
1004 res->atomic.skb = skb;
1005 res->first_psn = ack_pkt.psn;
1006 res->last_psn = ack_pkt.psn;
1007 res->cur_psn = ack_pkt.psn;
1008
1009 rc = rxe_xmit_packet(rxe, qp, &ack_pkt, skb);
1010 if (rc) {
1011 pr_err_ratelimited("Failed sending ack\n");
1012 rxe_drop_ref(qp);
1013 }
1014 out:
1015 return rc;
1016 }
1017
1018 static enum resp_states acknowledge(struct rxe_qp *qp,
1019 struct rxe_pkt_info *pkt)
1020 {
1021 if (qp_type(qp) != IB_QPT_RC)
1022 return RESPST_CLEANUP;
1023
1024 if (qp->resp.aeth_syndrome != AETH_ACK_UNLIMITED)
1025 send_ack(qp, pkt, qp->resp.aeth_syndrome, pkt->psn);
1026 else if (pkt->mask & RXE_ATOMIC_MASK)
1027 send_atomic_ack(qp, pkt, AETH_ACK_UNLIMITED);
1028 else if (bth_ack(pkt))
1029 send_ack(qp, pkt, AETH_ACK_UNLIMITED, pkt->psn);
1030
1031 return RESPST_CLEANUP;
1032 }
1033
1034 static enum resp_states cleanup(struct rxe_qp *qp,
1035 struct rxe_pkt_info *pkt)
1036 {
1037 struct sk_buff *skb;
1038
1039 if (pkt) {
1040 skb = skb_dequeue(&qp->req_pkts);
1041 rxe_drop_ref(qp);
1042 kfree_skb(skb);
1043 }
1044
1045 if (qp->resp.mr) {
1046 rxe_drop_ref(qp->resp.mr);
1047 qp->resp.mr = NULL;
1048 }
1049
1050 return RESPST_DONE;
1051 }
1052
1053 static struct resp_res *find_resource(struct rxe_qp *qp, u32 psn)
1054 {
1055 int i;
1056
1057 for (i = 0; i < qp->attr.max_dest_rd_atomic; i++) {
1058 struct resp_res *res = &qp->resp.resources[i];
1059
1060 if (res->type == 0)
1061 continue;
1062
1063 if (psn_compare(psn, res->first_psn) >= 0 &&
1064 psn_compare(psn, res->last_psn) <= 0) {
1065 return res;
1066 }
1067 }
1068
1069 return NULL;
1070 }
1071
1072 static enum resp_states duplicate_request(struct rxe_qp *qp,
1073 struct rxe_pkt_info *pkt)
1074 {
1075 enum resp_states rc;
1076 u32 prev_psn = (qp->resp.ack_psn - 1) & BTH_PSN_MASK;
1077
1078 if (pkt->mask & RXE_SEND_MASK ||
1079 pkt->mask & RXE_WRITE_MASK) {
1080 /* SEND. Ack again and cleanup. C9-105. */
1081 if (bth_ack(pkt))
1082 send_ack(qp, pkt, AETH_ACK_UNLIMITED, prev_psn);
1083 rc = RESPST_CLEANUP;
1084 goto out;
1085 } else if (pkt->mask & RXE_READ_MASK) {
1086 struct resp_res *res;
1087
1088 res = find_resource(qp, pkt->psn);
1089 if (!res) {
1090 /* Resource not found. Class D error. Drop the
1091 * request.
1092 */
1093 rc = RESPST_CLEANUP;
1094 goto out;
1095 } else {
1096 /* Ensure this new request is the same as the previous
1097 * one or a subset of it.
1098 */
1099 u64 iova = reth_va(pkt);
1100 u32 resid = reth_len(pkt);
1101
1102 if (iova < res->read.va_org ||
1103 resid > res->read.length ||
1104 (iova + resid) > (res->read.va_org +
1105 res->read.length)) {
1106 rc = RESPST_CLEANUP;
1107 goto out;
1108 }
1109
1110 if (reth_rkey(pkt) != res->read.rkey) {
1111 rc = RESPST_CLEANUP;
1112 goto out;
1113 }
1114
1115 res->cur_psn = pkt->psn;
1116 res->state = (pkt->psn == res->first_psn) ?
1117 rdatm_res_state_new :
1118 rdatm_res_state_replay;
1119 res->replay = 1;
1120
1121 /* Reset the resource, except length. */
1122 res->read.va_org = iova;
1123 res->read.va = iova;
1124 res->read.resid = resid;
1125
1126 /* Replay the RDMA read reply. */
1127 qp->resp.res = res;
1128 rc = RESPST_READ_REPLY;
1129 goto out;
1130 }
1131 } else {
1132 struct resp_res *res;
1133
1134 /* Find the operation in our list of responder resources. */
1135 res = find_resource(qp, pkt->psn);
1136 if (res) {
1137 skb_get(res->atomic.skb);
1138 /* Resend the result. */
1139 rc = rxe_xmit_packet(to_rdev(qp->ibqp.device), qp,
1140 pkt, res->atomic.skb);
1141 if (rc) {
1142 pr_err("Failed resending result. This flow is not handled - skb ignored\n");
1143 rc = RESPST_CLEANUP;
1144 goto out;
1145 }
1146 }
1147
1148 /* Resource not found. Class D error. Drop the request. */
1149 rc = RESPST_CLEANUP;
1150 goto out;
1151 }
1152 out:
1153 return rc;
1154 }
1155
1156 /* Process a class A or C. Both are treated the same in this implementation. */
1157 static void do_class_ac_error(struct rxe_qp *qp, u8 syndrome,
1158 enum ib_wc_status status)
1159 {
1160 qp->resp.aeth_syndrome = syndrome;
1161 qp->resp.status = status;
1162
1163 /* indicate that we should go through the ERROR state */
1164 qp->resp.goto_error = 1;
1165 }
1166
1167 static enum resp_states do_class_d1e_error(struct rxe_qp *qp)
1168 {
1169 /* UC */
1170 if (qp->srq) {
1171 /* Class E */
1172 qp->resp.drop_msg = 1;
1173 if (qp->resp.wqe) {
1174 qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1175 return RESPST_COMPLETE;
1176 } else {
1177 return RESPST_CLEANUP;
1178 }
1179 } else {
1180 /* Class D1. This packet may be the start of a
1181 * new message and could be valid. The previous
1182 * message is invalid and ignored. reset the
1183 * recv wr to its original state
1184 */
1185 if (qp->resp.wqe) {
1186 qp->resp.wqe->dma.resid = qp->resp.wqe->dma.length;
1187 qp->resp.wqe->dma.cur_sge = 0;
1188 qp->resp.wqe->dma.sge_offset = 0;
1189 qp->resp.opcode = -1;
1190 }
1191
1192 if (qp->resp.mr) {
1193 rxe_drop_ref(qp->resp.mr);
1194 qp->resp.mr = NULL;
1195 }
1196
1197 return RESPST_CLEANUP;
1198 }
1199 }
1200
1201 static void rxe_drain_req_pkts(struct rxe_qp *qp, bool notify)
1202 {
1203 struct sk_buff *skb;
1204
1205 while ((skb = skb_dequeue(&qp->req_pkts))) {
1206 rxe_drop_ref(qp);
1207 kfree_skb(skb);
1208 }
1209
1210 if (notify)
1211 return;
1212
1213 while (!qp->srq && qp->rq.queue && queue_head(qp->rq.queue))
1214 advance_consumer(qp->rq.queue);
1215 }
1216
1217 int rxe_responder(void *arg)
1218 {
1219 struct rxe_qp *qp = (struct rxe_qp *)arg;
1220 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
1221 enum resp_states state;
1222 struct rxe_pkt_info *pkt = NULL;
1223 int ret = 0;
1224
1225 rxe_add_ref(qp);
1226
1227 qp->resp.aeth_syndrome = AETH_ACK_UNLIMITED;
1228
1229 if (!qp->valid) {
1230 ret = -EINVAL;
1231 goto done;
1232 }
1233
1234 switch (qp->resp.state) {
1235 case QP_STATE_RESET:
1236 state = RESPST_RESET;
1237 break;
1238
1239 default:
1240 state = RESPST_GET_REQ;
1241 break;
1242 }
1243
1244 while (1) {
1245 pr_debug("qp#%d state = %s\n", qp_num(qp),
1246 resp_state_name[state]);
1247 switch (state) {
1248 case RESPST_GET_REQ:
1249 state = get_req(qp, &pkt);
1250 break;
1251 case RESPST_CHK_PSN:
1252 state = check_psn(qp, pkt);
1253 break;
1254 case RESPST_CHK_OP_SEQ:
1255 state = check_op_seq(qp, pkt);
1256 break;
1257 case RESPST_CHK_OP_VALID:
1258 state = check_op_valid(qp, pkt);
1259 break;
1260 case RESPST_CHK_RESOURCE:
1261 state = check_resource(qp, pkt);
1262 break;
1263 case RESPST_CHK_LENGTH:
1264 state = check_length(qp, pkt);
1265 break;
1266 case RESPST_CHK_RKEY:
1267 state = check_rkey(qp, pkt);
1268 break;
1269 case RESPST_EXECUTE:
1270 state = execute(qp, pkt);
1271 break;
1272 case RESPST_COMPLETE:
1273 state = do_complete(qp, pkt);
1274 break;
1275 case RESPST_READ_REPLY:
1276 state = read_reply(qp, pkt);
1277 break;
1278 case RESPST_ACKNOWLEDGE:
1279 state = acknowledge(qp, pkt);
1280 break;
1281 case RESPST_CLEANUP:
1282 state = cleanup(qp, pkt);
1283 break;
1284 case RESPST_DUPLICATE_REQUEST:
1285 state = duplicate_request(qp, pkt);
1286 break;
1287 case RESPST_ERR_PSN_OUT_OF_SEQ:
1288 /* RC only - Class B. Drop packet. */
1289 send_ack(qp, pkt, AETH_NAK_PSN_SEQ_ERROR, qp->resp.psn);
1290 state = RESPST_CLEANUP;
1291 break;
1292
1293 case RESPST_ERR_TOO_MANY_RDMA_ATM_REQ:
1294 case RESPST_ERR_MISSING_OPCODE_FIRST:
1295 case RESPST_ERR_MISSING_OPCODE_LAST_C:
1296 case RESPST_ERR_UNSUPPORTED_OPCODE:
1297 case RESPST_ERR_MISALIGNED_ATOMIC:
1298 /* RC Only - Class C. */
1299 do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1300 IB_WC_REM_INV_REQ_ERR);
1301 state = RESPST_COMPLETE;
1302 break;
1303
1304 case RESPST_ERR_MISSING_OPCODE_LAST_D1E:
1305 state = do_class_d1e_error(qp);
1306 break;
1307 case RESPST_ERR_RNR:
1308 if (qp_type(qp) == IB_QPT_RC) {
1309 rxe_counter_inc(rxe, RXE_CNT_SND_RNR);
1310 /* RC - class B */
1311 send_ack(qp, pkt, AETH_RNR_NAK |
1312 (~AETH_TYPE_MASK &
1313 qp->attr.min_rnr_timer),
1314 pkt->psn);
1315 } else {
1316 /* UD/UC - class D */
1317 qp->resp.drop_msg = 1;
1318 }
1319 state = RESPST_CLEANUP;
1320 break;
1321
1322 case RESPST_ERR_RKEY_VIOLATION:
1323 if (qp_type(qp) == IB_QPT_RC) {
1324 /* Class C */
1325 do_class_ac_error(qp, AETH_NAK_REM_ACC_ERR,
1326 IB_WC_REM_ACCESS_ERR);
1327 state = RESPST_COMPLETE;
1328 } else {
1329 qp->resp.drop_msg = 1;
1330 if (qp->srq) {
1331 /* UC/SRQ Class D */
1332 qp->resp.status = IB_WC_REM_ACCESS_ERR;
1333 state = RESPST_COMPLETE;
1334 } else {
1335 /* UC/non-SRQ Class E. */
1336 state = RESPST_CLEANUP;
1337 }
1338 }
1339 break;
1340
1341 case RESPST_ERR_LENGTH:
1342 if (qp_type(qp) == IB_QPT_RC) {
1343 /* Class C */
1344 do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1345 IB_WC_REM_INV_REQ_ERR);
1346 state = RESPST_COMPLETE;
1347 } else if (qp->srq) {
1348 /* UC/UD - class E */
1349 qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1350 state = RESPST_COMPLETE;
1351 } else {
1352 /* UC/UD - class D */
1353 qp->resp.drop_msg = 1;
1354 state = RESPST_CLEANUP;
1355 }
1356 break;
1357
1358 case RESPST_ERR_MALFORMED_WQE:
1359 /* All, Class A. */
1360 do_class_ac_error(qp, AETH_NAK_REM_OP_ERR,
1361 IB_WC_LOC_QP_OP_ERR);
1362 state = RESPST_COMPLETE;
1363 break;
1364
1365 case RESPST_ERR_CQ_OVERFLOW:
1366 /* All - Class G */
1367 state = RESPST_ERROR;
1368 break;
1369
1370 case RESPST_DONE:
1371 if (qp->resp.goto_error) {
1372 state = RESPST_ERROR;
1373 break;
1374 }
1375
1376 goto done;
1377
1378 case RESPST_EXIT:
1379 if (qp->resp.goto_error) {
1380 state = RESPST_ERROR;
1381 break;
1382 }
1383
1384 goto exit;
1385
1386 case RESPST_RESET:
1387 rxe_drain_req_pkts(qp, false);
1388 qp->resp.wqe = NULL;
1389 goto exit;
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_ONCE(1);
1399 }
1400 }
1401
1402 exit:
1403 ret = -EAGAIN;
1404 done:
1405 rxe_drop_ref(qp);
1406 return ret;
1407 }
Linux with added FPC-III support