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Merge branches 'for-5.1/upstream-fixes', 'for-5.2/core', 'for-5.2/ish', 'for-5.2...
[mirror_ubuntu-kernels.git] / drivers / infiniband / sw / rxe / rxe_resp.c
1 /*
2 * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
3 * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34 #include <linux/skbuff.h>
35
36 #include "rxe.h"
37 #include "rxe_loc.h"
38 #include "rxe_queue.h"
39
40 enum resp_states {
41 RESPST_NONE,
42 RESPST_GET_REQ,
43 RESPST_CHK_PSN,
44 RESPST_CHK_OP_SEQ,
45 RESPST_CHK_OP_VALID,
46 RESPST_CHK_RESOURCE,
47 RESPST_CHK_LENGTH,
48 RESPST_CHK_RKEY,
49 RESPST_EXECUTE,
50 RESPST_READ_REPLY,
51 RESPST_COMPLETE,
52 RESPST_ACKNOWLEDGE,
53 RESPST_CLEANUP,
54 RESPST_DUPLICATE_REQUEST,
55 RESPST_ERR_MALFORMED_WQE,
56 RESPST_ERR_UNSUPPORTED_OPCODE,
57 RESPST_ERR_MISALIGNED_ATOMIC,
58 RESPST_ERR_PSN_OUT_OF_SEQ,
59 RESPST_ERR_MISSING_OPCODE_FIRST,
60 RESPST_ERR_MISSING_OPCODE_LAST_C,
61 RESPST_ERR_MISSING_OPCODE_LAST_D1E,
62 RESPST_ERR_TOO_MANY_RDMA_ATM_REQ,
63 RESPST_ERR_RNR,
64 RESPST_ERR_RKEY_VIOLATION,
65 RESPST_ERR_LENGTH,
66 RESPST_ERR_CQ_OVERFLOW,
67 RESPST_ERROR,
68 RESPST_RESET,
69 RESPST_DONE,
70 RESPST_EXIT,
71 };
72
73 static char *resp_state_name[] = {
74 [RESPST_NONE] = "NONE",
75 [RESPST_GET_REQ] = "GET_REQ",
76 [RESPST_CHK_PSN] = "CHK_PSN",
77 [RESPST_CHK_OP_SEQ] = "CHK_OP_SEQ",
78 [RESPST_CHK_OP_VALID] = "CHK_OP_VALID",
79 [RESPST_CHK_RESOURCE] = "CHK_RESOURCE",
80 [RESPST_CHK_LENGTH] = "CHK_LENGTH",
81 [RESPST_CHK_RKEY] = "CHK_RKEY",
82 [RESPST_EXECUTE] = "EXECUTE",
83 [RESPST_READ_REPLY] = "READ_REPLY",
84 [RESPST_COMPLETE] = "COMPLETE",
85 [RESPST_ACKNOWLEDGE] = "ACKNOWLEDGE",
86 [RESPST_CLEANUP] = "CLEANUP",
87 [RESPST_DUPLICATE_REQUEST] = "DUPLICATE_REQUEST",
88 [RESPST_ERR_MALFORMED_WQE] = "ERR_MALFORMED_WQE",
89 [RESPST_ERR_UNSUPPORTED_OPCODE] = "ERR_UNSUPPORTED_OPCODE",
90 [RESPST_ERR_MISALIGNED_ATOMIC] = "ERR_MISALIGNED_ATOMIC",
91 [RESPST_ERR_PSN_OUT_OF_SEQ] = "ERR_PSN_OUT_OF_SEQ",
92 [RESPST_ERR_MISSING_OPCODE_FIRST] = "ERR_MISSING_OPCODE_FIRST",
93 [RESPST_ERR_MISSING_OPCODE_LAST_C] = "ERR_MISSING_OPCODE_LAST_C",
94 [RESPST_ERR_MISSING_OPCODE_LAST_D1E] = "ERR_MISSING_OPCODE_LAST_D1E",
95 [RESPST_ERR_TOO_MANY_RDMA_ATM_REQ] = "ERR_TOO_MANY_RDMA_ATM_REQ",
96 [RESPST_ERR_RNR] = "ERR_RNR",
97 [RESPST_ERR_RKEY_VIOLATION] = "ERR_RKEY_VIOLATION",
98 [RESPST_ERR_LENGTH] = "ERR_LENGTH",
99 [RESPST_ERR_CQ_OVERFLOW] = "ERR_CQ_OVERFLOW",
100 [RESPST_ERROR] = "ERROR",
101 [RESPST_RESET] = "RESET",
102 [RESPST_DONE] = "DONE",
103 [RESPST_EXIT] = "EXIT",
104 };
105
106 /* rxe_recv calls here to add a request packet to the input queue */
107 void rxe_resp_queue_pkt(struct rxe_qp *qp, struct sk_buff *skb)
108 {
109 int must_sched;
110 struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
111
112 skb_queue_tail(&qp->req_pkts, skb);
113
114 must_sched = (pkt->opcode == IB_OPCODE_RC_RDMA_READ_REQUEST) ||
115 (skb_queue_len(&qp->req_pkts) > 1);
116
117 rxe_run_task(&qp->resp.task, must_sched);
118 }
119
120 static inline enum resp_states get_req(struct rxe_qp *qp,
121 struct rxe_pkt_info **pkt_p)
122 {
123 struct sk_buff *skb;
124
125 if (qp->resp.state == QP_STATE_ERROR) {
126 while ((skb = skb_dequeue(&qp->req_pkts))) {
127 rxe_drop_ref(qp);
128 kfree_skb(skb);
129 }
130
131 /* go drain recv wr queue */
132 return RESPST_CHK_RESOURCE;
133 }
134
135 skb = skb_peek(&qp->req_pkts);
136 if (!skb)
137 return RESPST_EXIT;
138
139 *pkt_p = SKB_TO_PKT(skb);
140
141 return (qp->resp.res) ? RESPST_READ_REPLY : RESPST_CHK_PSN;
142 }
143
144 static enum resp_states check_psn(struct rxe_qp *qp,
145 struct rxe_pkt_info *pkt)
146 {
147 int diff = psn_compare(pkt->psn, qp->resp.psn);
148 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
149
150 switch (qp_type(qp)) {
151 case IB_QPT_RC:
152 if (diff > 0) {
153 if (qp->resp.sent_psn_nak)
154 return RESPST_CLEANUP;
155
156 qp->resp.sent_psn_nak = 1;
157 rxe_counter_inc(rxe, RXE_CNT_OUT_OF_SEQ_REQ);
158 return RESPST_ERR_PSN_OUT_OF_SEQ;
159
160 } else if (diff < 0) {
161 rxe_counter_inc(rxe, RXE_CNT_DUP_REQ);
162 return RESPST_DUPLICATE_REQUEST;
163 }
164
165 if (qp->resp.sent_psn_nak)
166 qp->resp.sent_psn_nak = 0;
167
168 break;
169
170 case IB_QPT_UC:
171 if (qp->resp.drop_msg || diff != 0) {
172 if (pkt->mask & RXE_START_MASK) {
173 qp->resp.drop_msg = 0;
174 return RESPST_CHK_OP_SEQ;
175 }
176
177 qp->resp.drop_msg = 1;
178 return RESPST_CLEANUP;
179 }
180 break;
181 default:
182 break;
183 }
184
185 return RESPST_CHK_OP_SEQ;
186 }
187
188 static enum resp_states check_op_seq(struct rxe_qp *qp,
189 struct rxe_pkt_info *pkt)
190 {
191 switch (qp_type(qp)) {
192 case IB_QPT_RC:
193 switch (qp->resp.opcode) {
194 case IB_OPCODE_RC_SEND_FIRST:
195 case IB_OPCODE_RC_SEND_MIDDLE:
196 switch (pkt->opcode) {
197 case IB_OPCODE_RC_SEND_MIDDLE:
198 case IB_OPCODE_RC_SEND_LAST:
199 case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE:
200 case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE:
201 return RESPST_CHK_OP_VALID;
202 default:
203 return RESPST_ERR_MISSING_OPCODE_LAST_C;
204 }
205
206 case IB_OPCODE_RC_RDMA_WRITE_FIRST:
207 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
208 switch (pkt->opcode) {
209 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
210 case IB_OPCODE_RC_RDMA_WRITE_LAST:
211 case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
212 return RESPST_CHK_OP_VALID;
213 default:
214 return RESPST_ERR_MISSING_OPCODE_LAST_C;
215 }
216
217 default:
218 switch (pkt->opcode) {
219 case IB_OPCODE_RC_SEND_MIDDLE:
220 case IB_OPCODE_RC_SEND_LAST:
221 case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE:
222 case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE:
223 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
224 case IB_OPCODE_RC_RDMA_WRITE_LAST:
225 case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
226 return RESPST_ERR_MISSING_OPCODE_FIRST;
227 default:
228 return RESPST_CHK_OP_VALID;
229 }
230 }
231 break;
232
233 case IB_QPT_UC:
234 switch (qp->resp.opcode) {
235 case IB_OPCODE_UC_SEND_FIRST:
236 case IB_OPCODE_UC_SEND_MIDDLE:
237 switch (pkt->opcode) {
238 case IB_OPCODE_UC_SEND_MIDDLE:
239 case IB_OPCODE_UC_SEND_LAST:
240 case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE:
241 return RESPST_CHK_OP_VALID;
242 default:
243 return RESPST_ERR_MISSING_OPCODE_LAST_D1E;
244 }
245
246 case IB_OPCODE_UC_RDMA_WRITE_FIRST:
247 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
248 switch (pkt->opcode) {
249 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
250 case IB_OPCODE_UC_RDMA_WRITE_LAST:
251 case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
252 return RESPST_CHK_OP_VALID;
253 default:
254 return RESPST_ERR_MISSING_OPCODE_LAST_D1E;
255 }
256
257 default:
258 switch (pkt->opcode) {
259 case IB_OPCODE_UC_SEND_MIDDLE:
260 case IB_OPCODE_UC_SEND_LAST:
261 case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE:
262 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
263 case IB_OPCODE_UC_RDMA_WRITE_LAST:
264 case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
265 qp->resp.drop_msg = 1;
266 return RESPST_CLEANUP;
267 default:
268 return RESPST_CHK_OP_VALID;
269 }
270 }
271 break;
272
273 default:
274 return RESPST_CHK_OP_VALID;
275 }
276 }
277
278 static enum resp_states check_op_valid(struct rxe_qp *qp,
279 struct rxe_pkt_info *pkt)
280 {
281 switch (qp_type(qp)) {
282 case IB_QPT_RC:
283 if (((pkt->mask & RXE_READ_MASK) &&
284 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_READ)) ||
285 ((pkt->mask & RXE_WRITE_MASK) &&
286 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) ||
287 ((pkt->mask & RXE_ATOMIC_MASK) &&
288 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) {
289 return RESPST_ERR_UNSUPPORTED_OPCODE;
290 }
291
292 break;
293
294 case IB_QPT_UC:
295 if ((pkt->mask & RXE_WRITE_MASK) &&
296 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) {
297 qp->resp.drop_msg = 1;
298 return RESPST_CLEANUP;
299 }
300
301 break;
302
303 case IB_QPT_UD:
304 case IB_QPT_SMI:
305 case IB_QPT_GSI:
306 break;
307
308 default:
309 WARN_ON_ONCE(1);
310 break;
311 }
312
313 return RESPST_CHK_RESOURCE;
314 }
315
316 static enum resp_states get_srq_wqe(struct rxe_qp *qp)
317 {
318 struct rxe_srq *srq = qp->srq;
319 struct rxe_queue *q = srq->rq.queue;
320 struct rxe_recv_wqe *wqe;
321 struct ib_event ev;
322
323 if (srq->error)
324 return RESPST_ERR_RNR;
325
326 spin_lock_bh(&srq->rq.consumer_lock);
327
328 wqe = queue_head(q);
329 if (!wqe) {
330 spin_unlock_bh(&srq->rq.consumer_lock);
331 return RESPST_ERR_RNR;
332 }
333
334 /* note kernel and user space recv wqes have same size */
335 memcpy(&qp->resp.srq_wqe, wqe, sizeof(qp->resp.srq_wqe));
336
337 qp->resp.wqe = &qp->resp.srq_wqe.wqe;
338 advance_consumer(q);
339
340 if (srq->limit && srq->ibsrq.event_handler &&
341 (queue_count(q) < srq->limit)) {
342 srq->limit = 0;
343 goto event;
344 }
345
346 spin_unlock_bh(&srq->rq.consumer_lock);
347 return RESPST_CHK_LENGTH;
348
349 event:
350 spin_unlock_bh(&srq->rq.consumer_lock);
351 ev.device = qp->ibqp.device;
352 ev.element.srq = qp->ibqp.srq;
353 ev.event = IB_EVENT_SRQ_LIMIT_REACHED;
354 srq->ibsrq.event_handler(&ev, srq->ibsrq.srq_context);
355 return RESPST_CHK_LENGTH;
356 }
357
358 static enum resp_states check_resource(struct rxe_qp *qp,
359 struct rxe_pkt_info *pkt)
360 {
361 struct rxe_srq *srq = qp->srq;
362
363 if (qp->resp.state == QP_STATE_ERROR) {
364 if (qp->resp.wqe) {
365 qp->resp.status = IB_WC_WR_FLUSH_ERR;
366 return RESPST_COMPLETE;
367 } else if (!srq) {
368 qp->resp.wqe = queue_head(qp->rq.queue);
369 if (qp->resp.wqe) {
370 qp->resp.status = IB_WC_WR_FLUSH_ERR;
371 return RESPST_COMPLETE;
372 } else {
373 return RESPST_EXIT;
374 }
375 } else {
376 return RESPST_EXIT;
377 }
378 }
379
380 if (pkt->mask & RXE_READ_OR_ATOMIC) {
381 /* it is the requesters job to not send
382 * too many read/atomic ops, we just
383 * recycle the responder resource queue
384 */
385 if (likely(qp->attr.max_dest_rd_atomic > 0))
386 return RESPST_CHK_LENGTH;
387 else
388 return RESPST_ERR_TOO_MANY_RDMA_ATM_REQ;
389 }
390
391 if (pkt->mask & RXE_RWR_MASK) {
392 if (srq)
393 return get_srq_wqe(qp);
394
395 qp->resp.wqe = queue_head(qp->rq.queue);
396 return (qp->resp.wqe) ? RESPST_CHK_LENGTH : RESPST_ERR_RNR;
397 }
398
399 return RESPST_CHK_LENGTH;
400 }
401
402 static enum resp_states check_length(struct rxe_qp *qp,
403 struct rxe_pkt_info *pkt)
404 {
405 switch (qp_type(qp)) {
406 case IB_QPT_RC:
407 return RESPST_CHK_RKEY;
408
409 case IB_QPT_UC:
410 return RESPST_CHK_RKEY;
411
412 default:
413 return RESPST_CHK_RKEY;
414 }
415 }
416
417 static enum resp_states check_rkey(struct rxe_qp *qp,
418 struct rxe_pkt_info *pkt)
419 {
420 struct rxe_mem *mem = NULL;
421 u64 va;
422 u32 rkey;
423 u32 resid;
424 u32 pktlen;
425 int mtu = qp->mtu;
426 enum resp_states state;
427 int access;
428
429 if (pkt->mask & (RXE_READ_MASK | RXE_WRITE_MASK)) {
430 if (pkt->mask & RXE_RETH_MASK) {
431 qp->resp.va = reth_va(pkt);
432 qp->resp.rkey = reth_rkey(pkt);
433 qp->resp.resid = reth_len(pkt);
434 }
435 access = (pkt->mask & RXE_READ_MASK) ? IB_ACCESS_REMOTE_READ
436 : IB_ACCESS_REMOTE_WRITE;
437 } else if (pkt->mask & RXE_ATOMIC_MASK) {
438 qp->resp.va = atmeth_va(pkt);
439 qp->resp.rkey = atmeth_rkey(pkt);
440 qp->resp.resid = sizeof(u64);
441 access = IB_ACCESS_REMOTE_ATOMIC;
442 } else {
443 return RESPST_EXECUTE;
444 }
445
446 /* A zero-byte op is not required to set an addr or rkey. */
447 if ((pkt->mask & (RXE_READ_MASK | RXE_WRITE_OR_SEND)) &&
448 (pkt->mask & RXE_RETH_MASK) &&
449 reth_len(pkt) == 0) {
450 return RESPST_EXECUTE;
451 }
452
453 va = qp->resp.va;
454 rkey = qp->resp.rkey;
455 resid = qp->resp.resid;
456 pktlen = payload_size(pkt);
457
458 mem = lookup_mem(qp->pd, access, rkey, lookup_remote);
459 if (!mem) {
460 state = RESPST_ERR_RKEY_VIOLATION;
461 goto err;
462 }
463
464 if (unlikely(mem->state == RXE_MEM_STATE_FREE)) {
465 state = RESPST_ERR_RKEY_VIOLATION;
466 goto err;
467 }
468
469 if (mem_check_range(mem, va, resid)) {
470 state = RESPST_ERR_RKEY_VIOLATION;
471 goto err;
472 }
473
474 if (pkt->mask & RXE_WRITE_MASK) {
475 if (resid > mtu) {
476 if (pktlen != mtu || bth_pad(pkt)) {
477 state = RESPST_ERR_LENGTH;
478 goto err;
479 }
480 } else {
481 if (pktlen != resid) {
482 state = RESPST_ERR_LENGTH;
483 goto err;
484 }
485 if ((bth_pad(pkt) != (0x3 & (-resid)))) {
486 /* This case may not be exactly that
487 * but nothing else fits.
488 */
489 state = RESPST_ERR_LENGTH;
490 goto err;
491 }
492 }
493 }
494
495 WARN_ON_ONCE(qp->resp.mr);
496
497 qp->resp.mr = mem;
498 return RESPST_EXECUTE;
499
500 err:
501 if (mem)
502 rxe_drop_ref(mem);
503 return state;
504 }
505
506 static enum resp_states send_data_in(struct rxe_qp *qp, void *data_addr,
507 int data_len)
508 {
509 int err;
510
511 err = copy_data(qp->pd, IB_ACCESS_LOCAL_WRITE, &qp->resp.wqe->dma,
512 data_addr, data_len, to_mem_obj, NULL);
513 if (unlikely(err))
514 return (err == -ENOSPC) ? RESPST_ERR_LENGTH
515 : RESPST_ERR_MALFORMED_WQE;
516
517 return RESPST_NONE;
518 }
519
520 static enum resp_states write_data_in(struct rxe_qp *qp,
521 struct rxe_pkt_info *pkt)
522 {
523 enum resp_states rc = RESPST_NONE;
524 int err;
525 int data_len = payload_size(pkt);
526
527 err = rxe_mem_copy(qp->resp.mr, qp->resp.va, payload_addr(pkt),
528 data_len, to_mem_obj, NULL);
529 if (err) {
530 rc = RESPST_ERR_RKEY_VIOLATION;
531 goto out;
532 }
533
534 qp->resp.va += data_len;
535 qp->resp.resid -= data_len;
536
537 out:
538 return rc;
539 }
540
541 /* Guarantee atomicity of atomic operations at the machine level. */
542 static DEFINE_SPINLOCK(atomic_ops_lock);
543
544 static enum resp_states process_atomic(struct rxe_qp *qp,
545 struct rxe_pkt_info *pkt)
546 {
547 u64 iova = atmeth_va(pkt);
548 u64 *vaddr;
549 enum resp_states ret;
550 struct rxe_mem *mr = qp->resp.mr;
551
552 if (mr->state != RXE_MEM_STATE_VALID) {
553 ret = RESPST_ERR_RKEY_VIOLATION;
554 goto out;
555 }
556
557 vaddr = iova_to_vaddr(mr, iova, sizeof(u64));
558
559 /* check vaddr is 8 bytes aligned. */
560 if (!vaddr || (uintptr_t)vaddr & 7) {
561 ret = RESPST_ERR_MISALIGNED_ATOMIC;
562 goto out;
563 }
564
565 spin_lock_bh(&atomic_ops_lock);
566
567 qp->resp.atomic_orig = *vaddr;
568
569 if (pkt->opcode == IB_OPCODE_RC_COMPARE_SWAP ||
570 pkt->opcode == IB_OPCODE_RD_COMPARE_SWAP) {
571 if (*vaddr == atmeth_comp(pkt))
572 *vaddr = atmeth_swap_add(pkt);
573 } else {
574 *vaddr += atmeth_swap_add(pkt);
575 }
576
577 spin_unlock_bh(&atomic_ops_lock);
578
579 ret = RESPST_NONE;
580 out:
581 return ret;
582 }
583
584 static struct sk_buff *prepare_ack_packet(struct rxe_qp *qp,
585 struct rxe_pkt_info *pkt,
586 struct rxe_pkt_info *ack,
587 int opcode,
588 int payload,
589 u32 psn,
590 u8 syndrome,
591 u32 *crcp)
592 {
593 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
594 struct sk_buff *skb;
595 u32 crc = 0;
596 u32 *p;
597 int paylen;
598 int pad;
599 int err;
600
601 /*
602 * allocate packet
603 */
604 pad = (-payload) & 0x3;
605 paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE;
606
607 skb = rxe_init_packet(rxe, &qp->pri_av, paylen, ack);
608 if (!skb)
609 return NULL;
610
611 ack->qp = qp;
612 ack->opcode = opcode;
613 ack->mask = rxe_opcode[opcode].mask;
614 ack->offset = pkt->offset;
615 ack->paylen = paylen;
616
617 /* fill in bth using the request packet headers */
618 memcpy(ack->hdr, pkt->hdr, pkt->offset + RXE_BTH_BYTES);
619
620 bth_set_opcode(ack, opcode);
621 bth_set_qpn(ack, qp->attr.dest_qp_num);
622 bth_set_pad(ack, pad);
623 bth_set_se(ack, 0);
624 bth_set_psn(ack, psn);
625 bth_set_ack(ack, 0);
626 ack->psn = psn;
627
628 if (ack->mask & RXE_AETH_MASK) {
629 aeth_set_syn(ack, syndrome);
630 aeth_set_msn(ack, qp->resp.msn);
631 }
632
633 if (ack->mask & RXE_ATMACK_MASK)
634 atmack_set_orig(ack, qp->resp.atomic_orig);
635
636 err = rxe_prepare(ack, skb, &crc);
637 if (err) {
638 kfree_skb(skb);
639 return NULL;
640 }
641
642 if (crcp) {
643 /* CRC computation will be continued by the caller */
644 *crcp = crc;
645 } else {
646 p = payload_addr(ack) + payload + bth_pad(ack);
647 *p = ~crc;
648 }
649
650 return skb;
651 }
652
653 /* RDMA read response. If res is not NULL, then we have a current RDMA request
654 * being processed or replayed.
655 */
656 static enum resp_states read_reply(struct rxe_qp *qp,
657 struct rxe_pkt_info *req_pkt)
658 {
659 struct rxe_pkt_info ack_pkt;
660 struct sk_buff *skb;
661 int mtu = qp->mtu;
662 enum resp_states state;
663 int payload;
664 int opcode;
665 int err;
666 struct resp_res *res = qp->resp.res;
667 u32 icrc;
668 u32 *p;
669
670 if (!res) {
671 /* This is the first time we process that request. Get a
672 * resource
673 */
674 res = &qp->resp.resources[qp->resp.res_head];
675
676 free_rd_atomic_resource(qp, res);
677 rxe_advance_resp_resource(qp);
678
679 res->type = RXE_READ_MASK;
680 res->replay = 0;
681
682 res->read.va = qp->resp.va;
683 res->read.va_org = qp->resp.va;
684
685 res->first_psn = req_pkt->psn;
686
687 if (reth_len(req_pkt)) {
688 res->last_psn = (req_pkt->psn +
689 (reth_len(req_pkt) + mtu - 1) /
690 mtu - 1) & BTH_PSN_MASK;
691 } else {
692 res->last_psn = res->first_psn;
693 }
694 res->cur_psn = req_pkt->psn;
695
696 res->read.resid = qp->resp.resid;
697 res->read.length = qp->resp.resid;
698 res->read.rkey = qp->resp.rkey;
699
700 /* note res inherits the reference to mr from qp */
701 res->read.mr = qp->resp.mr;
702 qp->resp.mr = NULL;
703
704 qp->resp.res = res;
705 res->state = rdatm_res_state_new;
706 }
707
708 if (res->state == rdatm_res_state_new) {
709 if (res->read.resid <= mtu)
710 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_ONLY;
711 else
712 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST;
713 } else {
714 if (res->read.resid > mtu)
715 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE;
716 else
717 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_LAST;
718 }
719
720 res->state = rdatm_res_state_next;
721
722 payload = min_t(int, res->read.resid, mtu);
723
724 skb = prepare_ack_packet(qp, req_pkt, &ack_pkt, opcode, payload,
725 res->cur_psn, AETH_ACK_UNLIMITED, &icrc);
726 if (!skb)
727 return RESPST_ERR_RNR;
728
729 err = rxe_mem_copy(res->read.mr, res->read.va, payload_addr(&ack_pkt),
730 payload, from_mem_obj, &icrc);
731 if (err)
732 pr_err("Failed copying memory\n");
733
734 p = payload_addr(&ack_pkt) + payload + bth_pad(&ack_pkt);
735 *p = ~icrc;
736
737 err = rxe_xmit_packet(qp, &ack_pkt, skb);
738 if (err) {
739 pr_err("Failed sending RDMA reply.\n");
740 return RESPST_ERR_RNR;
741 }
742
743 res->read.va += payload;
744 res->read.resid -= payload;
745 res->cur_psn = (res->cur_psn + 1) & BTH_PSN_MASK;
746
747 if (res->read.resid > 0) {
748 state = RESPST_DONE;
749 } else {
750 qp->resp.res = NULL;
751 if (!res->replay)
752 qp->resp.opcode = -1;
753 if (psn_compare(res->cur_psn, qp->resp.psn) >= 0)
754 qp->resp.psn = res->cur_psn;
755 state = RESPST_CLEANUP;
756 }
757
758 return state;
759 }
760
761 static void build_rdma_network_hdr(union rdma_network_hdr *hdr,
762 struct rxe_pkt_info *pkt)
763 {
764 struct sk_buff *skb = PKT_TO_SKB(pkt);
765
766 memset(hdr, 0, sizeof(*hdr));
767 if (skb->protocol == htons(ETH_P_IP))
768 memcpy(&hdr->roce4grh, ip_hdr(skb), sizeof(hdr->roce4grh));
769 else if (skb->protocol == htons(ETH_P_IPV6))
770 memcpy(&hdr->ibgrh, ipv6_hdr(skb), sizeof(hdr->ibgrh));
771 }
772
773 /* Executes a new request. A retried request never reach that function (send
774 * and writes are discarded, and reads and atomics are retried elsewhere.
775 */
776 static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt)
777 {
778 enum resp_states err;
779
780 if (pkt->mask & RXE_SEND_MASK) {
781 if (qp_type(qp) == IB_QPT_UD ||
782 qp_type(qp) == IB_QPT_SMI ||
783 qp_type(qp) == IB_QPT_GSI) {
784 union rdma_network_hdr hdr;
785
786 build_rdma_network_hdr(&hdr, pkt);
787
788 err = send_data_in(qp, &hdr, sizeof(hdr));
789 if (err)
790 return err;
791 }
792 err = send_data_in(qp, payload_addr(pkt), payload_size(pkt));
793 if (err)
794 return err;
795 } else if (pkt->mask & RXE_WRITE_MASK) {
796 err = write_data_in(qp, pkt);
797 if (err)
798 return err;
799 } else if (pkt->mask & RXE_READ_MASK) {
800 /* For RDMA Read we can increment the msn now. See C9-148. */
801 qp->resp.msn++;
802 return RESPST_READ_REPLY;
803 } else if (pkt->mask & RXE_ATOMIC_MASK) {
804 err = process_atomic(qp, pkt);
805 if (err)
806 return err;
807 } else {
808 /* Unreachable */
809 WARN_ON_ONCE(1);
810 }
811
812 /* next expected psn, read handles this separately */
813 qp->resp.psn = (pkt->psn + 1) & BTH_PSN_MASK;
814 qp->resp.ack_psn = qp->resp.psn;
815
816 qp->resp.opcode = pkt->opcode;
817 qp->resp.status = IB_WC_SUCCESS;
818
819 if (pkt->mask & RXE_COMP_MASK) {
820 /* We successfully processed this new request. */
821 qp->resp.msn++;
822 return RESPST_COMPLETE;
823 } else if (qp_type(qp) == IB_QPT_RC)
824 return RESPST_ACKNOWLEDGE;
825 else
826 return RESPST_CLEANUP;
827 }
828
829 static enum resp_states do_complete(struct rxe_qp *qp,
830 struct rxe_pkt_info *pkt)
831 {
832 struct rxe_cqe cqe;
833 struct ib_wc *wc = &cqe.ibwc;
834 struct ib_uverbs_wc *uwc = &cqe.uibwc;
835 struct rxe_recv_wqe *wqe = qp->resp.wqe;
836 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
837
838 if (unlikely(!wqe))
839 return RESPST_CLEANUP;
840
841 memset(&cqe, 0, sizeof(cqe));
842
843 if (qp->rcq->is_user) {
844 uwc->status = qp->resp.status;
845 uwc->qp_num = qp->ibqp.qp_num;
846 uwc->wr_id = wqe->wr_id;
847 } else {
848 wc->status = qp->resp.status;
849 wc->qp = &qp->ibqp;
850 wc->wr_id = wqe->wr_id;
851 }
852
853 if (wc->status == IB_WC_SUCCESS) {
854 rxe_counter_inc(rxe, RXE_CNT_RDMA_RECV);
855 wc->opcode = (pkt->mask & RXE_IMMDT_MASK &&
856 pkt->mask & RXE_WRITE_MASK) ?
857 IB_WC_RECV_RDMA_WITH_IMM : IB_WC_RECV;
858 wc->vendor_err = 0;
859 wc->byte_len = wqe->dma.length - wqe->dma.resid;
860
861 /* fields after byte_len are different between kernel and user
862 * space
863 */
864 if (qp->rcq->is_user) {
865 uwc->wc_flags = IB_WC_GRH;
866
867 if (pkt->mask & RXE_IMMDT_MASK) {
868 uwc->wc_flags |= IB_WC_WITH_IMM;
869 uwc->ex.imm_data = immdt_imm(pkt);
870 }
871
872 if (pkt->mask & RXE_IETH_MASK) {
873 uwc->wc_flags |= IB_WC_WITH_INVALIDATE;
874 uwc->ex.invalidate_rkey = ieth_rkey(pkt);
875 }
876
877 uwc->qp_num = qp->ibqp.qp_num;
878
879 if (pkt->mask & RXE_DETH_MASK)
880 uwc->src_qp = deth_sqp(pkt);
881
882 uwc->port_num = qp->attr.port_num;
883 } else {
884 struct sk_buff *skb = PKT_TO_SKB(pkt);
885
886 wc->wc_flags = IB_WC_GRH | IB_WC_WITH_NETWORK_HDR_TYPE;
887 if (skb->protocol == htons(ETH_P_IP))
888 wc->network_hdr_type = RDMA_NETWORK_IPV4;
889 else
890 wc->network_hdr_type = RDMA_NETWORK_IPV6;
891
892 if (is_vlan_dev(skb->dev)) {
893 wc->wc_flags |= IB_WC_WITH_VLAN;
894 wc->vlan_id = vlan_dev_vlan_id(skb->dev);
895 }
896
897 if (pkt->mask & RXE_IMMDT_MASK) {
898 wc->wc_flags |= IB_WC_WITH_IMM;
899 wc->ex.imm_data = immdt_imm(pkt);
900 }
901
902 if (pkt->mask & RXE_IETH_MASK) {
903 struct rxe_mem *rmr;
904
905 wc->wc_flags |= IB_WC_WITH_INVALIDATE;
906 wc->ex.invalidate_rkey = ieth_rkey(pkt);
907
908 rmr = rxe_pool_get_index(&rxe->mr_pool,
909 wc->ex.invalidate_rkey >> 8);
910 if (unlikely(!rmr)) {
911 pr_err("Bad rkey %#x invalidation\n",
912 wc->ex.invalidate_rkey);
913 return RESPST_ERROR;
914 }
915 rmr->state = RXE_MEM_STATE_FREE;
916 rxe_drop_ref(rmr);
917 }
918
919 wc->qp = &qp->ibqp;
920
921 if (pkt->mask & RXE_DETH_MASK)
922 wc->src_qp = deth_sqp(pkt);
923
924 wc->port_num = qp->attr.port_num;
925 }
926 }
927
928 /* have copy for srq and reference for !srq */
929 if (!qp->srq)
930 advance_consumer(qp->rq.queue);
931
932 qp->resp.wqe = NULL;
933
934 if (rxe_cq_post(qp->rcq, &cqe, pkt ? bth_se(pkt) : 1))
935 return RESPST_ERR_CQ_OVERFLOW;
936
937 if (qp->resp.state == QP_STATE_ERROR)
938 return RESPST_CHK_RESOURCE;
939
940 if (!pkt)
941 return RESPST_DONE;
942 else if (qp_type(qp) == IB_QPT_RC)
943 return RESPST_ACKNOWLEDGE;
944 else
945 return RESPST_CLEANUP;
946 }
947
948 static int send_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
949 u8 syndrome, u32 psn)
950 {
951 int err = 0;
952 struct rxe_pkt_info ack_pkt;
953 struct sk_buff *skb;
954
955 skb = prepare_ack_packet(qp, pkt, &ack_pkt, IB_OPCODE_RC_ACKNOWLEDGE,
956 0, psn, syndrome, NULL);
957 if (!skb) {
958 err = -ENOMEM;
959 goto err1;
960 }
961
962 err = rxe_xmit_packet(qp, &ack_pkt, skb);
963 if (err)
964 pr_err_ratelimited("Failed sending ack\n");
965
966 err1:
967 return err;
968 }
969
970 static int send_atomic_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
971 u8 syndrome)
972 {
973 int rc = 0;
974 struct rxe_pkt_info ack_pkt;
975 struct sk_buff *skb;
976 struct resp_res *res;
977
978 skb = prepare_ack_packet(qp, pkt, &ack_pkt,
979 IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE, 0, pkt->psn,
980 syndrome, NULL);
981 if (!skb) {
982 rc = -ENOMEM;
983 goto out;
984 }
985
986 rxe_add_ref(qp);
987
988 res = &qp->resp.resources[qp->resp.res_head];
989 free_rd_atomic_resource(qp, res);
990 rxe_advance_resp_resource(qp);
991
992 memcpy(SKB_TO_PKT(skb), &ack_pkt, sizeof(ack_pkt));
993 memset((unsigned char *)SKB_TO_PKT(skb) + sizeof(ack_pkt), 0,
994 sizeof(skb->cb) - sizeof(ack_pkt));
995
996 skb_get(skb);
997 res->type = RXE_ATOMIC_MASK;
998 res->atomic.skb = skb;
999 res->first_psn = ack_pkt.psn;
1000 res->last_psn = ack_pkt.psn;
1001 res->cur_psn = ack_pkt.psn;
1002
1003 rc = rxe_xmit_packet(qp, &ack_pkt, skb);
1004 if (rc) {
1005 pr_err_ratelimited("Failed sending ack\n");
1006 rxe_drop_ref(qp);
1007 }
1008 out:
1009 return rc;
1010 }
1011
1012 static enum resp_states acknowledge(struct rxe_qp *qp,
1013 struct rxe_pkt_info *pkt)
1014 {
1015 if (qp_type(qp) != IB_QPT_RC)
1016 return RESPST_CLEANUP;
1017
1018 if (qp->resp.aeth_syndrome != AETH_ACK_UNLIMITED)
1019 send_ack(qp, pkt, qp->resp.aeth_syndrome, pkt->psn);
1020 else if (pkt->mask & RXE_ATOMIC_MASK)
1021 send_atomic_ack(qp, pkt, AETH_ACK_UNLIMITED);
1022 else if (bth_ack(pkt))
1023 send_ack(qp, pkt, AETH_ACK_UNLIMITED, pkt->psn);
1024
1025 return RESPST_CLEANUP;
1026 }
1027
1028 static enum resp_states cleanup(struct rxe_qp *qp,
1029 struct rxe_pkt_info *pkt)
1030 {
1031 struct sk_buff *skb;
1032
1033 if (pkt) {
1034 skb = skb_dequeue(&qp->req_pkts);
1035 rxe_drop_ref(qp);
1036 kfree_skb(skb);
1037 }
1038
1039 if (qp->resp.mr) {
1040 rxe_drop_ref(qp->resp.mr);
1041 qp->resp.mr = NULL;
1042 }
1043
1044 return RESPST_DONE;
1045 }
1046
1047 static struct resp_res *find_resource(struct rxe_qp *qp, u32 psn)
1048 {
1049 int i;
1050
1051 for (i = 0; i < qp->attr.max_dest_rd_atomic; i++) {
1052 struct resp_res *res = &qp->resp.resources[i];
1053
1054 if (res->type == 0)
1055 continue;
1056
1057 if (psn_compare(psn, res->first_psn) >= 0 &&
1058 psn_compare(psn, res->last_psn) <= 0) {
1059 return res;
1060 }
1061 }
1062
1063 return NULL;
1064 }
1065
1066 static enum resp_states duplicate_request(struct rxe_qp *qp,
1067 struct rxe_pkt_info *pkt)
1068 {
1069 enum resp_states rc;
1070 u32 prev_psn = (qp->resp.ack_psn - 1) & BTH_PSN_MASK;
1071
1072 if (pkt->mask & RXE_SEND_MASK ||
1073 pkt->mask & RXE_WRITE_MASK) {
1074 /* SEND. Ack again and cleanup. C9-105. */
1075 if (bth_ack(pkt))
1076 send_ack(qp, pkt, AETH_ACK_UNLIMITED, prev_psn);
1077 rc = RESPST_CLEANUP;
1078 goto out;
1079 } else if (pkt->mask & RXE_READ_MASK) {
1080 struct resp_res *res;
1081
1082 res = find_resource(qp, pkt->psn);
1083 if (!res) {
1084 /* Resource not found. Class D error. Drop the
1085 * request.
1086 */
1087 rc = RESPST_CLEANUP;
1088 goto out;
1089 } else {
1090 /* Ensure this new request is the same as the previous
1091 * one or a subset of it.
1092 */
1093 u64 iova = reth_va(pkt);
1094 u32 resid = reth_len(pkt);
1095
1096 if (iova < res->read.va_org ||
1097 resid > res->read.length ||
1098 (iova + resid) > (res->read.va_org +
1099 res->read.length)) {
1100 rc = RESPST_CLEANUP;
1101 goto out;
1102 }
1103
1104 if (reth_rkey(pkt) != res->read.rkey) {
1105 rc = RESPST_CLEANUP;
1106 goto out;
1107 }
1108
1109 res->cur_psn = pkt->psn;
1110 res->state = (pkt->psn == res->first_psn) ?
1111 rdatm_res_state_new :
1112 rdatm_res_state_replay;
1113 res->replay = 1;
1114
1115 /* Reset the resource, except length. */
1116 res->read.va_org = iova;
1117 res->read.va = iova;
1118 res->read.resid = resid;
1119
1120 /* Replay the RDMA read reply. */
1121 qp->resp.res = res;
1122 rc = RESPST_READ_REPLY;
1123 goto out;
1124 }
1125 } else {
1126 struct resp_res *res;
1127
1128 /* Find the operation in our list of responder resources. */
1129 res = find_resource(qp, pkt->psn);
1130 if (res) {
1131 skb_get(res->atomic.skb);
1132 /* Resend the result. */
1133 rc = rxe_xmit_packet(qp, pkt, res->atomic.skb);
1134 if (rc) {
1135 pr_err("Failed resending result. This flow is not handled - skb ignored\n");
1136 rc = RESPST_CLEANUP;
1137 goto out;
1138 }
1139 }
1140
1141 /* Resource not found. Class D error. Drop the request. */
1142 rc = RESPST_CLEANUP;
1143 goto out;
1144 }
1145 out:
1146 return rc;
1147 }
1148
1149 /* Process a class A or C. Both are treated the same in this implementation. */
1150 static void do_class_ac_error(struct rxe_qp *qp, u8 syndrome,
1151 enum ib_wc_status status)
1152 {
1153 qp->resp.aeth_syndrome = syndrome;
1154 qp->resp.status = status;
1155
1156 /* indicate that we should go through the ERROR state */
1157 qp->resp.goto_error = 1;
1158 }
1159
1160 static enum resp_states do_class_d1e_error(struct rxe_qp *qp)
1161 {
1162 /* UC */
1163 if (qp->srq) {
1164 /* Class E */
1165 qp->resp.drop_msg = 1;
1166 if (qp->resp.wqe) {
1167 qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1168 return RESPST_COMPLETE;
1169 } else {
1170 return RESPST_CLEANUP;
1171 }
1172 } else {
1173 /* Class D1. This packet may be the start of a
1174 * new message and could be valid. The previous
1175 * message is invalid and ignored. reset the
1176 * recv wr to its original state
1177 */
1178 if (qp->resp.wqe) {
1179 qp->resp.wqe->dma.resid = qp->resp.wqe->dma.length;
1180 qp->resp.wqe->dma.cur_sge = 0;
1181 qp->resp.wqe->dma.sge_offset = 0;
1182 qp->resp.opcode = -1;
1183 }
1184
1185 if (qp->resp.mr) {
1186 rxe_drop_ref(qp->resp.mr);
1187 qp->resp.mr = NULL;
1188 }
1189
1190 return RESPST_CLEANUP;
1191 }
1192 }
1193
1194 static void rxe_drain_req_pkts(struct rxe_qp *qp, bool notify)
1195 {
1196 struct sk_buff *skb;
1197
1198 while ((skb = skb_dequeue(&qp->req_pkts))) {
1199 rxe_drop_ref(qp);
1200 kfree_skb(skb);
1201 }
1202
1203 if (notify)
1204 return;
1205
1206 while (!qp->srq && qp->rq.queue && queue_head(qp->rq.queue))
1207 advance_consumer(qp->rq.queue);
1208 }
1209
1210 int rxe_responder(void *arg)
1211 {
1212 struct rxe_qp *qp = (struct rxe_qp *)arg;
1213 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
1214 enum resp_states state;
1215 struct rxe_pkt_info *pkt = NULL;
1216 int ret = 0;
1217
1218 rxe_add_ref(qp);
1219
1220 qp->resp.aeth_syndrome = AETH_ACK_UNLIMITED;
1221
1222 if (!qp->valid) {
1223 ret = -EINVAL;
1224 goto done;
1225 }
1226
1227 switch (qp->resp.state) {
1228 case QP_STATE_RESET:
1229 state = RESPST_RESET;
1230 break;
1231
1232 default:
1233 state = RESPST_GET_REQ;
1234 break;
1235 }
1236
1237 while (1) {
1238 pr_debug("qp#%d state = %s\n", qp_num(qp),
1239 resp_state_name[state]);
1240 switch (state) {
1241 case RESPST_GET_REQ:
1242 state = get_req(qp, &pkt);
1243 break;
1244 case RESPST_CHK_PSN:
1245 state = check_psn(qp, pkt);
1246 break;
1247 case RESPST_CHK_OP_SEQ:
1248 state = check_op_seq(qp, pkt);
1249 break;
1250 case RESPST_CHK_OP_VALID:
1251 state = check_op_valid(qp, pkt);
1252 break;
1253 case RESPST_CHK_RESOURCE:
1254 state = check_resource(qp, pkt);
1255 break;
1256 case RESPST_CHK_LENGTH:
1257 state = check_length(qp, pkt);
1258 break;
1259 case RESPST_CHK_RKEY:
1260 state = check_rkey(qp, pkt);
1261 break;
1262 case RESPST_EXECUTE:
1263 state = execute(qp, pkt);
1264 break;
1265 case RESPST_COMPLETE:
1266 state = do_complete(qp, pkt);
1267 break;
1268 case RESPST_READ_REPLY:
1269 state = read_reply(qp, pkt);
1270 break;
1271 case RESPST_ACKNOWLEDGE:
1272 state = acknowledge(qp, pkt);
1273 break;
1274 case RESPST_CLEANUP:
1275 state = cleanup(qp, pkt);
1276 break;
1277 case RESPST_DUPLICATE_REQUEST:
1278 state = duplicate_request(qp, pkt);
1279 break;
1280 case RESPST_ERR_PSN_OUT_OF_SEQ:
1281 /* RC only - Class B. Drop packet. */
1282 send_ack(qp, pkt, AETH_NAK_PSN_SEQ_ERROR, qp->resp.psn);
1283 state = RESPST_CLEANUP;
1284 break;
1285
1286 case RESPST_ERR_TOO_MANY_RDMA_ATM_REQ:
1287 case RESPST_ERR_MISSING_OPCODE_FIRST:
1288 case RESPST_ERR_MISSING_OPCODE_LAST_C:
1289 case RESPST_ERR_UNSUPPORTED_OPCODE:
1290 case RESPST_ERR_MISALIGNED_ATOMIC:
1291 /* RC Only - Class C. */
1292 do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1293 IB_WC_REM_INV_REQ_ERR);
1294 state = RESPST_COMPLETE;
1295 break;
1296
1297 case RESPST_ERR_MISSING_OPCODE_LAST_D1E:
1298 state = do_class_d1e_error(qp);
1299 break;
1300 case RESPST_ERR_RNR:
1301 if (qp_type(qp) == IB_QPT_RC) {
1302 rxe_counter_inc(rxe, RXE_CNT_SND_RNR);
1303 /* RC - class B */
1304 send_ack(qp, pkt, AETH_RNR_NAK |
1305 (~AETH_TYPE_MASK &
1306 qp->attr.min_rnr_timer),
1307 pkt->psn);
1308 } else {
1309 /* UD/UC - class D */
1310 qp->resp.drop_msg = 1;
1311 }
1312 state = RESPST_CLEANUP;
1313 break;
1314
1315 case RESPST_ERR_RKEY_VIOLATION:
1316 if (qp_type(qp) == IB_QPT_RC) {
1317 /* Class C */
1318 do_class_ac_error(qp, AETH_NAK_REM_ACC_ERR,
1319 IB_WC_REM_ACCESS_ERR);
1320 state = RESPST_COMPLETE;
1321 } else {
1322 qp->resp.drop_msg = 1;
1323 if (qp->srq) {
1324 /* UC/SRQ Class D */
1325 qp->resp.status = IB_WC_REM_ACCESS_ERR;
1326 state = RESPST_COMPLETE;
1327 } else {
1328 /* UC/non-SRQ Class E. */
1329 state = RESPST_CLEANUP;
1330 }
1331 }
1332 break;
1333
1334 case RESPST_ERR_LENGTH:
1335 if (qp_type(qp) == IB_QPT_RC) {
1336 /* Class C */
1337 do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1338 IB_WC_REM_INV_REQ_ERR);
1339 state = RESPST_COMPLETE;
1340 } else if (qp->srq) {
1341 /* UC/UD - class E */
1342 qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1343 state = RESPST_COMPLETE;
1344 } else {
1345 /* UC/UD - class D */
1346 qp->resp.drop_msg = 1;
1347 state = RESPST_CLEANUP;
1348 }
1349 break;
1350
1351 case RESPST_ERR_MALFORMED_WQE:
1352 /* All, Class A. */
1353 do_class_ac_error(qp, AETH_NAK_REM_OP_ERR,
1354 IB_WC_LOC_QP_OP_ERR);
1355 state = RESPST_COMPLETE;
1356 break;
1357
1358 case RESPST_ERR_CQ_OVERFLOW:
1359 /* All - Class G */
1360 state = RESPST_ERROR;
1361 break;
1362
1363 case RESPST_DONE:
1364 if (qp->resp.goto_error) {
1365 state = RESPST_ERROR;
1366 break;
1367 }
1368
1369 goto done;
1370
1371 case RESPST_EXIT:
1372 if (qp->resp.goto_error) {
1373 state = RESPST_ERROR;
1374 break;
1375 }
1376
1377 goto exit;
1378
1379 case RESPST_RESET:
1380 rxe_drain_req_pkts(qp, false);
1381 qp->resp.wqe = NULL;
1382 goto exit;
1383
1384 case RESPST_ERROR:
1385 qp->resp.goto_error = 0;
1386 pr_warn("qp#%d moved to error state\n", qp_num(qp));
1387 rxe_qp_error(qp);
1388 goto exit;
1389
1390 default:
1391 WARN_ON_ONCE(1);
1392 }
1393 }
1394
1395 exit:
1396 ret = -EAGAIN;
1397 done:
1398 rxe_drop_ref(qp);
1399 return ret;
1400 }
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