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[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_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 while ((skb = skb_dequeue(&qp->req_pkts))) {
128 rxe_drop_ref(qp);
129 kfree_skb(skb);
130 }
131
132 /* go drain recv wr queue */
133 return RESPST_CHK_RESOURCE;
134 }
135
136 skb = skb_peek(&qp->req_pkts);
137 if (!skb)
138 return RESPST_EXIT;
139
140 *pkt_p = SKB_TO_PKT(skb);
141
142 return (qp->resp.res) ? RESPST_READ_REPLY : RESPST_CHK_PSN;
143 }
144
145 static enum resp_states check_psn(struct rxe_qp *qp,
146 struct rxe_pkt_info *pkt)
147 {
148 int diff = psn_compare(pkt->psn, qp->resp.psn);
149 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
150
151 switch (qp_type(qp)) {
152 case IB_QPT_RC:
153 if (diff > 0) {
154 if (qp->resp.sent_psn_nak)
155 return RESPST_CLEANUP;
156
157 qp->resp.sent_psn_nak = 1;
158 rxe_counter_inc(rxe, RXE_CNT_OUT_OF_SEQ_REQ);
159 return RESPST_ERR_PSN_OUT_OF_SEQ;
160
161 } else if (diff < 0) {
162 rxe_counter_inc(rxe, RXE_CNT_DUP_REQ);
163 return RESPST_DUPLICATE_REQUEST;
164 }
165
166 if (qp->resp.sent_psn_nak)
167 qp->resp.sent_psn_nak = 0;
168
169 break;
170
171 case IB_QPT_UC:
172 if (qp->resp.drop_msg || diff != 0) {
173 if (pkt->mask & RXE_START_MASK) {
174 qp->resp.drop_msg = 0;
175 return RESPST_CHK_OP_SEQ;
176 }
177
178 qp->resp.drop_msg = 1;
179 return RESPST_CLEANUP;
180 }
181 break;
182 default:
183 break;
184 }
185
186 return RESPST_CHK_OP_SEQ;
187 }
188
189 static enum resp_states check_op_seq(struct rxe_qp *qp,
190 struct rxe_pkt_info *pkt)
191 {
192 switch (qp_type(qp)) {
193 case IB_QPT_RC:
194 switch (qp->resp.opcode) {
195 case IB_OPCODE_RC_SEND_FIRST:
196 case IB_OPCODE_RC_SEND_MIDDLE:
197 switch (pkt->opcode) {
198 case IB_OPCODE_RC_SEND_MIDDLE:
199 case IB_OPCODE_RC_SEND_LAST:
200 case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE:
201 case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE:
202 return RESPST_CHK_OP_VALID;
203 default:
204 return RESPST_ERR_MISSING_OPCODE_LAST_C;
205 }
206
207 case IB_OPCODE_RC_RDMA_WRITE_FIRST:
208 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
209 switch (pkt->opcode) {
210 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
211 case IB_OPCODE_RC_RDMA_WRITE_LAST:
212 case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
213 return RESPST_CHK_OP_VALID;
214 default:
215 return RESPST_ERR_MISSING_OPCODE_LAST_C;
216 }
217
218 default:
219 switch (pkt->opcode) {
220 case IB_OPCODE_RC_SEND_MIDDLE:
221 case IB_OPCODE_RC_SEND_LAST:
222 case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE:
223 case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE:
224 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
225 case IB_OPCODE_RC_RDMA_WRITE_LAST:
226 case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
227 return RESPST_ERR_MISSING_OPCODE_FIRST;
228 default:
229 return RESPST_CHK_OP_VALID;
230 }
231 }
232 break;
233
234 case IB_QPT_UC:
235 switch (qp->resp.opcode) {
236 case IB_OPCODE_UC_SEND_FIRST:
237 case IB_OPCODE_UC_SEND_MIDDLE:
238 switch (pkt->opcode) {
239 case IB_OPCODE_UC_SEND_MIDDLE:
240 case IB_OPCODE_UC_SEND_LAST:
241 case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE:
242 return RESPST_CHK_OP_VALID;
243 default:
244 return RESPST_ERR_MISSING_OPCODE_LAST_D1E;
245 }
246
247 case IB_OPCODE_UC_RDMA_WRITE_FIRST:
248 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
249 switch (pkt->opcode) {
250 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
251 case IB_OPCODE_UC_RDMA_WRITE_LAST:
252 case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
253 return RESPST_CHK_OP_VALID;
254 default:
255 return RESPST_ERR_MISSING_OPCODE_LAST_D1E;
256 }
257
258 default:
259 switch (pkt->opcode) {
260 case IB_OPCODE_UC_SEND_MIDDLE:
261 case IB_OPCODE_UC_SEND_LAST:
262 case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE:
263 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
264 case IB_OPCODE_UC_RDMA_WRITE_LAST:
265 case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
266 qp->resp.drop_msg = 1;
267 return RESPST_CLEANUP;
268 default:
269 return RESPST_CHK_OP_VALID;
270 }
271 }
272 break;
273
274 default:
275 return RESPST_CHK_OP_VALID;
276 }
277 }
278
279 static enum resp_states check_op_valid(struct rxe_qp *qp,
280 struct rxe_pkt_info *pkt)
281 {
282 switch (qp_type(qp)) {
283 case IB_QPT_RC:
284 if (((pkt->mask & RXE_READ_MASK) &&
285 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_READ)) ||
286 ((pkt->mask & RXE_WRITE_MASK) &&
287 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) ||
288 ((pkt->mask & RXE_ATOMIC_MASK) &&
289 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) {
290 return RESPST_ERR_UNSUPPORTED_OPCODE;
291 }
292
293 break;
294
295 case IB_QPT_UC:
296 if ((pkt->mask & RXE_WRITE_MASK) &&
297 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) {
298 qp->resp.drop_msg = 1;
299 return RESPST_CLEANUP;
300 }
301
302 break;
303
304 case IB_QPT_UD:
305 case IB_QPT_SMI:
306 case IB_QPT_GSI:
307 break;
308
309 default:
310 WARN_ON_ONCE(1);
311 break;
312 }
313
314 return RESPST_CHK_RESOURCE;
315 }
316
317 static enum resp_states get_srq_wqe(struct rxe_qp *qp)
318 {
319 struct rxe_srq *srq = qp->srq;
320 struct rxe_queue *q = srq->rq.queue;
321 struct rxe_recv_wqe *wqe;
322 struct ib_event ev;
323
324 if (srq->error)
325 return RESPST_ERR_RNR;
326
327 spin_lock_bh(&srq->rq.consumer_lock);
328
329 wqe = queue_head(q);
330 if (!wqe) {
331 spin_unlock_bh(&srq->rq.consumer_lock);
332 return RESPST_ERR_RNR;
333 }
334
335 /* note kernel and user space recv wqes have same size */
336 memcpy(&qp->resp.srq_wqe, wqe, sizeof(qp->resp.srq_wqe));
337
338 qp->resp.wqe = &qp->resp.srq_wqe.wqe;
339 advance_consumer(q);
340
341 if (srq->limit && srq->ibsrq.event_handler &&
342 (queue_count(q) < srq->limit)) {
343 srq->limit = 0;
344 goto event;
345 }
346
347 spin_unlock_bh(&srq->rq.consumer_lock);
348 return RESPST_CHK_LENGTH;
349
350 event:
351 spin_unlock_bh(&srq->rq.consumer_lock);
352 ev.device = qp->ibqp.device;
353 ev.element.srq = qp->ibqp.srq;
354 ev.event = IB_EVENT_SRQ_LIMIT_REACHED;
355 srq->ibsrq.event_handler(&ev, srq->ibsrq.srq_context);
356 return RESPST_CHK_LENGTH;
357 }
358
359 static enum resp_states check_resource(struct rxe_qp *qp,
360 struct rxe_pkt_info *pkt)
361 {
362 struct rxe_srq *srq = qp->srq;
363
364 if (qp->resp.state == QP_STATE_ERROR) {
365 if (qp->resp.wqe) {
366 qp->resp.status = IB_WC_WR_FLUSH_ERR;
367 return RESPST_COMPLETE;
368 } else if (!srq) {
369 qp->resp.wqe = queue_head(qp->rq.queue);
370 if (qp->resp.wqe) {
371 qp->resp.status = IB_WC_WR_FLUSH_ERR;
372 return RESPST_COMPLETE;
373 } else {
374 return RESPST_EXIT;
375 }
376 } else {
377 return RESPST_EXIT;
378 }
379 }
380
381 if (pkt->mask & RXE_READ_OR_ATOMIC) {
382 /* it is the requesters job to not send
383 * too many read/atomic ops, we just
384 * recycle the responder resource queue
385 */
386 if (likely(qp->attr.max_dest_rd_atomic > 0))
387 return RESPST_CHK_LENGTH;
388 else
389 return RESPST_ERR_TOO_MANY_RDMA_ATM_REQ;
390 }
391
392 if (pkt->mask & RXE_RWR_MASK) {
393 if (srq)
394 return get_srq_wqe(qp);
395
396 qp->resp.wqe = queue_head(qp->rq.queue);
397 return (qp->resp.wqe) ? RESPST_CHK_LENGTH : RESPST_ERR_RNR;
398 }
399
400 return RESPST_CHK_LENGTH;
401 }
402
403 static enum resp_states check_length(struct rxe_qp *qp,
404 struct rxe_pkt_info *pkt)
405 {
406 switch (qp_type(qp)) {
407 case IB_QPT_RC:
408 return RESPST_CHK_RKEY;
409
410 case IB_QPT_UC:
411 return RESPST_CHK_RKEY;
412
413 default:
414 return RESPST_CHK_RKEY;
415 }
416 }
417
418 static enum resp_states check_rkey(struct rxe_qp *qp,
419 struct rxe_pkt_info *pkt)
420 {
421 struct rxe_mem *mem = NULL;
422 u64 va;
423 u32 rkey;
424 u32 resid;
425 u32 pktlen;
426 int mtu = qp->mtu;
427 enum resp_states state;
428 int access;
429
430 if (pkt->mask & (RXE_READ_MASK | RXE_WRITE_MASK)) {
431 if (pkt->mask & RXE_RETH_MASK) {
432 qp->resp.va = reth_va(pkt);
433 qp->resp.rkey = reth_rkey(pkt);
434 qp->resp.resid = reth_len(pkt);
435 }
436 access = (pkt->mask & RXE_READ_MASK) ? IB_ACCESS_REMOTE_READ
437 : IB_ACCESS_REMOTE_WRITE;
438 } else if (pkt->mask & RXE_ATOMIC_MASK) {
439 qp->resp.va = atmeth_va(pkt);
440 qp->resp.rkey = atmeth_rkey(pkt);
441 qp->resp.resid = sizeof(u64);
442 access = IB_ACCESS_REMOTE_ATOMIC;
443 } else {
444 return RESPST_EXECUTE;
445 }
446
447 /* A zero-byte op is not required to set an addr or rkey. */
448 if ((pkt->mask & (RXE_READ_MASK | RXE_WRITE_OR_SEND)) &&
449 (pkt->mask & RXE_RETH_MASK) &&
450 reth_len(pkt) == 0) {
451 return RESPST_EXECUTE;
452 }
453
454 va = qp->resp.va;
455 rkey = qp->resp.rkey;
456 resid = qp->resp.resid;
457 pktlen = payload_size(pkt);
458
459 mem = lookup_mem(qp->pd, access, rkey, lookup_remote);
460 if (!mem) {
461 state = RESPST_ERR_RKEY_VIOLATION;
462 goto err;
463 }
464
465 if (unlikely(mem->state == RXE_MEM_STATE_FREE)) {
466 state = RESPST_ERR_RKEY_VIOLATION;
467 goto err;
468 }
469
470 if (mem_check_range(mem, va, resid)) {
471 state = RESPST_ERR_RKEY_VIOLATION;
472 goto err;
473 }
474
475 if (pkt->mask & RXE_WRITE_MASK) {
476 if (resid > mtu) {
477 if (pktlen != mtu || bth_pad(pkt)) {
478 state = RESPST_ERR_LENGTH;
479 goto err;
480 }
481 } else {
482 if (pktlen != resid) {
483 state = RESPST_ERR_LENGTH;
484 goto err;
485 }
486 if ((bth_pad(pkt) != (0x3 & (-resid)))) {
487 /* This case may not be exactly that
488 * but nothing else fits.
489 */
490 state = RESPST_ERR_LENGTH;
491 goto err;
492 }
493 }
494 }
495
496 WARN_ON_ONCE(qp->resp.mr);
497
498 qp->resp.mr = mem;
499 return RESPST_EXECUTE;
500
501 err:
502 if (mem)
503 rxe_drop_ref(mem);
504 return state;
505 }
506
507 static enum resp_states send_data_in(struct rxe_qp *qp, void *data_addr,
508 int data_len)
509 {
510 int err;
511
512 err = copy_data(qp->pd, IB_ACCESS_LOCAL_WRITE, &qp->resp.wqe->dma,
513 data_addr, data_len, to_mem_obj, NULL);
514 if (unlikely(err))
515 return (err == -ENOSPC) ? RESPST_ERR_LENGTH
516 : RESPST_ERR_MALFORMED_WQE;
517
518 return RESPST_NONE;
519 }
520
521 static enum resp_states write_data_in(struct rxe_qp *qp,
522 struct rxe_pkt_info *pkt)
523 {
524 enum resp_states rc = RESPST_NONE;
525 int err;
526 int data_len = payload_size(pkt);
527
528 err = rxe_mem_copy(qp->resp.mr, qp->resp.va, payload_addr(pkt),
529 data_len, to_mem_obj, NULL);
530 if (err) {
531 rc = RESPST_ERR_RKEY_VIOLATION;
532 goto out;
533 }
534
535 qp->resp.va += data_len;
536 qp->resp.resid -= data_len;
537
538 out:
539 return rc;
540 }
541
542 /* Guarantee atomicity of atomic operations at the machine level. */
543 static DEFINE_SPINLOCK(atomic_ops_lock);
544
545 static enum resp_states process_atomic(struct rxe_qp *qp,
546 struct rxe_pkt_info *pkt)
547 {
548 u64 iova = atmeth_va(pkt);
549 u64 *vaddr;
550 enum resp_states ret;
551 struct rxe_mem *mr = qp->resp.mr;
552
553 if (mr->state != RXE_MEM_STATE_VALID) {
554 ret = RESPST_ERR_RKEY_VIOLATION;
555 goto out;
556 }
557
558 vaddr = iova_to_vaddr(mr, iova, sizeof(u64));
559
560 /* check vaddr is 8 bytes aligned. */
561 if (!vaddr || (uintptr_t)vaddr & 7) {
562 ret = RESPST_ERR_MISALIGNED_ATOMIC;
563 goto out;
564 }
565
566 spin_lock_bh(&atomic_ops_lock);
567
568 qp->resp.atomic_orig = *vaddr;
569
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);
574 } else {
575 *vaddr += atmeth_swap_add(pkt);
576 }
577
578 spin_unlock_bh(&atomic_ops_lock);
579
580 ret = RESPST_NONE;
581 out:
582 return ret;
583 }
584
585 static struct sk_buff *prepare_ack_packet(struct rxe_qp *qp,
586 struct rxe_pkt_info *pkt,
587 struct rxe_pkt_info *ack,
588 int opcode,
589 int payload,
590 u32 psn,
591 u8 syndrome,
592 u32 *crcp)
593 {
594 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
595 struct sk_buff *skb;
596 u32 crc = 0;
597 u32 *p;
598 int paylen;
599 int pad;
600 int err;
601
602 /*
603 * allocate packet
604 */
605 pad = (-payload) & 0x3;
606 paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE;
607
608 skb = rxe_init_packet(rxe, &qp->pri_av, paylen, ack);
609 if (!skb)
610 return NULL;
611
612 ack->qp = qp;
613 ack->opcode = opcode;
614 ack->mask = rxe_opcode[opcode].mask;
615 ack->offset = pkt->offset;
616 ack->paylen = paylen;
617
618 /* fill in bth using the request packet headers */
619 memcpy(ack->hdr, pkt->hdr, pkt->offset + RXE_BTH_BYTES);
620
621 bth_set_opcode(ack, opcode);
622 bth_set_qpn(ack, qp->attr.dest_qp_num);
623 bth_set_pad(ack, pad);
624 bth_set_se(ack, 0);
625 bth_set_psn(ack, psn);
626 bth_set_ack(ack, 0);
627 ack->psn = psn;
628
629 if (ack->mask & RXE_AETH_MASK) {
630 aeth_set_syn(ack, syndrome);
631 aeth_set_msn(ack, qp->resp.msn);
632 }
633
634 if (ack->mask & RXE_ATMACK_MASK)
635 atmack_set_orig(ack, qp->resp.atomic_orig);
636
637 err = rxe_prepare(ack, skb, &crc);
638 if (err) {
639 kfree_skb(skb);
640 return NULL;
641 }
642
643 if (crcp) {
644 /* CRC computation will be continued by the caller */
645 *crcp = crc;
646 } else {
647 p = payload_addr(ack) + payload + bth_pad(ack);
648 *p = ~crc;
649 }
650
651 return skb;
652 }
653
654 /* RDMA read response. If res is not NULL, then we have a current RDMA request
655 * being processed or replayed.
656 */
657 static enum resp_states read_reply(struct rxe_qp *qp,
658 struct rxe_pkt_info *req_pkt)
659 {
660 struct rxe_pkt_info ack_pkt;
661 struct sk_buff *skb;
662 int mtu = qp->mtu;
663 enum resp_states state;
664 int payload;
665 int opcode;
666 int err;
667 struct resp_res *res = qp->resp.res;
668 u32 icrc;
669 u32 *p;
670
671 if (!res) {
672 /* This is the first time we process that request. Get a
673 * resource
674 */
675 res = &qp->resp.resources[qp->resp.res_head];
676
677 free_rd_atomic_resource(qp, res);
678 rxe_advance_resp_resource(qp);
679
680 res->type = RXE_READ_MASK;
681 res->replay = 0;
682
683 res->read.va = qp->resp.va;
684 res->read.va_org = qp->resp.va;
685
686 res->first_psn = req_pkt->psn;
687
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;
692 } else {
693 res->last_psn = res->first_psn;
694 }
695 res->cur_psn = req_pkt->psn;
696
697 res->read.resid = qp->resp.resid;
698 res->read.length = qp->resp.resid;
699 res->read.rkey = qp->resp.rkey;
700
701 /* note res inherits the reference to mr from qp */
702 res->read.mr = qp->resp.mr;
703 qp->resp.mr = NULL;
704
705 qp->resp.res = res;
706 res->state = rdatm_res_state_new;
707 }
708
709 if (res->state == rdatm_res_state_new) {
710 if (res->read.resid <= mtu)
711 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_ONLY;
712 else
713 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST;
714 } else {
715 if (res->read.resid > mtu)
716 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE;
717 else
718 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_LAST;
719 }
720
721 res->state = rdatm_res_state_next;
722
723 payload = min_t(int, res->read.resid, mtu);
724
725 skb = prepare_ack_packet(qp, req_pkt, &ack_pkt, opcode, payload,
726 res->cur_psn, AETH_ACK_UNLIMITED, &icrc);
727 if (!skb)
728 return RESPST_ERR_RNR;
729
730 err = rxe_mem_copy(res->read.mr, res->read.va, payload_addr(&ack_pkt),
731 payload, from_mem_obj, &icrc);
732 if (err)
733 pr_err("Failed copying memory\n");
734
735 p = payload_addr(&ack_pkt) + payload + bth_pad(&ack_pkt);
736 *p = ~icrc;
737
738 err = rxe_xmit_packet(qp, &ack_pkt, skb);
739 if (err) {
740 pr_err("Failed sending RDMA reply.\n");
741 return RESPST_ERR_RNR;
742 }
743
744 res->read.va += payload;
745 res->read.resid -= payload;
746 res->cur_psn = (res->cur_psn + 1) & BTH_PSN_MASK;
747
748 if (res->read.resid > 0) {
749 state = RESPST_DONE;
750 } else {
751 qp->resp.res = NULL;
752 if (!res->replay)
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;
757 }
758
759 return state;
760 }
761
762 static void build_rdma_network_hdr(union rdma_network_hdr *hdr,
763 struct rxe_pkt_info *pkt)
764 {
765 struct sk_buff *skb = PKT_TO_SKB(pkt);
766
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));
772 }
773
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.
776 */
777 static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt)
778 {
779 enum resp_states err;
780
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;
786
787 build_rdma_network_hdr(&hdr, pkt);
788
789 err = send_data_in(qp, &hdr, sizeof(hdr));
790 if (err)
791 return err;
792 }
793 err = send_data_in(qp, payload_addr(pkt), payload_size(pkt));
794 if (err)
795 return err;
796 } else if (pkt->mask & RXE_WRITE_MASK) {
797 err = write_data_in(qp, pkt);
798 if (err)
799 return err;
800 } else if (pkt->mask & RXE_READ_MASK) {
801 /* For RDMA Read we can increment the msn now. See C9-148. */
802 qp->resp.msn++;
803 return RESPST_READ_REPLY;
804 } else if (pkt->mask & RXE_ATOMIC_MASK) {
805 err = process_atomic(qp, pkt);
806 if (err)
807 return err;
808 } else {
809 /* Unreachable */
810 WARN_ON_ONCE(1);
811 }
812
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;
816
817 qp->resp.opcode = pkt->opcode;
818 qp->resp.status = IB_WC_SUCCESS;
819
820 if (pkt->mask & RXE_COMP_MASK) {
821 /* We successfully processed this new request. */
822 qp->resp.msn++;
823 return RESPST_COMPLETE;
824 } else if (qp_type(qp) == IB_QPT_RC)
825 return RESPST_ACKNOWLEDGE;
826 else
827 return RESPST_CLEANUP;
828 }
829
830 static enum resp_states do_complete(struct rxe_qp *qp,
831 struct rxe_pkt_info *pkt)
832 {
833 struct rxe_cqe cqe;
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);
838
839 if (unlikely(!wqe))
840 return RESPST_CLEANUP;
841
842 memset(&cqe, 0, sizeof(cqe));
843
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;
848 } else {
849 wc->status = qp->resp.status;
850 wc->qp = &qp->ibqp;
851 wc->wr_id = wqe->wr_id;
852 }
853
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;
859 wc->vendor_err = 0;
860 wc->byte_len = wqe->dma.length - wqe->dma.resid;
861
862 /* fields after byte_len are different between kernel and user
863 * space
864 */
865 if (qp->rcq->is_user) {
866 uwc->wc_flags = IB_WC_GRH;
867
868 if (pkt->mask & RXE_IMMDT_MASK) {
869 uwc->wc_flags |= IB_WC_WITH_IMM;
870 uwc->ex.imm_data = immdt_imm(pkt);
871 }
872
873 if (pkt->mask & RXE_IETH_MASK) {
874 uwc->wc_flags |= IB_WC_WITH_INVALIDATE;
875 uwc->ex.invalidate_rkey = ieth_rkey(pkt);
876 }
877
878 uwc->qp_num = qp->ibqp.qp_num;
879
880 if (pkt->mask & RXE_DETH_MASK)
881 uwc->src_qp = deth_sqp(pkt);
882
883 uwc->port_num = qp->attr.port_num;
884 } else {
885 struct sk_buff *skb = PKT_TO_SKB(pkt);
886
887 wc->wc_flags = IB_WC_GRH | IB_WC_WITH_NETWORK_HDR_TYPE;
888 if (skb->protocol == htons(ETH_P_IP))
889 wc->network_hdr_type = RDMA_NETWORK_IPV4;
890 else
891 wc->network_hdr_type = RDMA_NETWORK_IPV6;
892
893 if (is_vlan_dev(skb->dev)) {
894 wc->wc_flags |= IB_WC_WITH_VLAN;
895 wc->vlan_id = vlan_dev_vlan_id(skb->dev);
896 }
897
898 if (pkt->mask & RXE_IMMDT_MASK) {
899 wc->wc_flags |= IB_WC_WITH_IMM;
900 wc->ex.imm_data = immdt_imm(pkt);
901 }
902
903 if (pkt->mask & RXE_IETH_MASK) {
904 struct rxe_mem *rmr;
905
906 wc->wc_flags |= IB_WC_WITH_INVALIDATE;
907 wc->ex.invalidate_rkey = ieth_rkey(pkt);
908
909 rmr = rxe_pool_get_index(&rxe->mr_pool,
910 wc->ex.invalidate_rkey >> 8);
911 if (unlikely(!rmr)) {
912 pr_err("Bad rkey %#x invalidation\n",
913 wc->ex.invalidate_rkey);
914 return RESPST_ERROR;
915 }
916 rmr->state = RXE_MEM_STATE_FREE;
917 rxe_drop_ref(rmr);
918 }
919
920 wc->qp = &qp->ibqp;
921
922 if (pkt->mask & RXE_DETH_MASK)
923 wc->src_qp = deth_sqp(pkt);
924
925 wc->port_num = qp->attr.port_num;
926 }
927 }
928
929 /* have copy for srq and reference for !srq */
930 if (!qp->srq)
931 advance_consumer(qp->rq.queue);
932
933 qp->resp.wqe = NULL;
934
935 if (rxe_cq_post(qp->rcq, &cqe, pkt ? bth_se(pkt) : 1))
936 return RESPST_ERR_CQ_OVERFLOW;
937
938 if (qp->resp.state == QP_STATE_ERROR)
939 return RESPST_CHK_RESOURCE;
940
941 if (!pkt)
942 return RESPST_DONE;
943 else if (qp_type(qp) == IB_QPT_RC)
944 return RESPST_ACKNOWLEDGE;
945 else
946 return RESPST_CLEANUP;
947 }
948
949 static int send_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
950 u8 syndrome, u32 psn)
951 {
952 int err = 0;
953 struct rxe_pkt_info ack_pkt;
954 struct sk_buff *skb;
955
956 skb = prepare_ack_packet(qp, pkt, &ack_pkt, IB_OPCODE_RC_ACKNOWLEDGE,
957 0, psn, syndrome, NULL);
958 if (!skb) {
959 err = -ENOMEM;
960 goto err1;
961 }
962
963 err = rxe_xmit_packet(qp, &ack_pkt, skb);
964 if (err)
965 pr_err_ratelimited("Failed sending ack\n");
966
967 err1:
968 return err;
969 }
970
971 static int send_atomic_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
972 u8 syndrome)
973 {
974 int rc = 0;
975 struct rxe_pkt_info ack_pkt;
976 struct sk_buff *skb;
977 struct resp_res *res;
978
979 skb = prepare_ack_packet(qp, pkt, &ack_pkt,
980 IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE, 0, pkt->psn,
981 syndrome, NULL);
982 if (!skb) {
983 rc = -ENOMEM;
984 goto out;
985 }
986
987 rxe_add_ref(qp);
988
989 res = &qp->resp.resources[qp->resp.res_head];
990 free_rd_atomic_resource(qp, res);
991 rxe_advance_resp_resource(qp);
992
993 memcpy(SKB_TO_PKT(skb), &ack_pkt, sizeof(ack_pkt));
994 memset((unsigned char *)SKB_TO_PKT(skb) + sizeof(ack_pkt), 0,
995 sizeof(skb->cb) - sizeof(ack_pkt));
996
997 skb_get(skb);
998 res->type = RXE_ATOMIC_MASK;
999 res->atomic.skb = skb;
1000 res->first_psn = ack_pkt.psn;
1001 res->last_psn = ack_pkt.psn;
1002 res->cur_psn = ack_pkt.psn;
1003
1004 rc = rxe_xmit_packet(qp, &ack_pkt, skb);
1005 if (rc) {
1006 pr_err_ratelimited("Failed sending ack\n");
1007 rxe_drop_ref(qp);
1008 }
1009 out:
1010 return rc;
1011 }
1012
1013 static enum resp_states acknowledge(struct rxe_qp *qp,
1014 struct rxe_pkt_info *pkt)
1015 {
1016 if (qp_type(qp) != IB_QPT_RC)
1017 return RESPST_CLEANUP;
1018
1019 if (qp->resp.aeth_syndrome != AETH_ACK_UNLIMITED)
1020 send_ack(qp, pkt, qp->resp.aeth_syndrome, pkt->psn);
1021 else if (pkt->mask & RXE_ATOMIC_MASK)
1022 send_atomic_ack(qp, pkt, AETH_ACK_UNLIMITED);
1023 else if (bth_ack(pkt))
1024 send_ack(qp, pkt, AETH_ACK_UNLIMITED, pkt->psn);
1025
1026 return RESPST_CLEANUP;
1027 }
1028
1029 static enum resp_states cleanup(struct rxe_qp *qp,
1030 struct rxe_pkt_info *pkt)
1031 {
1032 struct sk_buff *skb;
1033
1034 if (pkt) {
1035 skb = skb_dequeue(&qp->req_pkts);
1036 rxe_drop_ref(qp);
1037 kfree_skb(skb);
1038 }
1039
1040 if (qp->resp.mr) {
1041 rxe_drop_ref(qp->resp.mr);
1042 qp->resp.mr = NULL;
1043 }
1044
1045 return RESPST_DONE;
1046 }
1047
1048 static struct resp_res *find_resource(struct rxe_qp *qp, u32 psn)
1049 {
1050 int i;
1051
1052 for (i = 0; i < qp->attr.max_dest_rd_atomic; i++) {
1053 struct resp_res *res = &qp->resp.resources[i];
1054
1055 if (res->type == 0)
1056 continue;
1057
1058 if (psn_compare(psn, res->first_psn) >= 0 &&
1059 psn_compare(psn, res->last_psn) <= 0) {
1060 return res;
1061 }
1062 }
1063
1064 return NULL;
1065 }
1066
1067 static enum resp_states duplicate_request(struct rxe_qp *qp,
1068 struct rxe_pkt_info *pkt)
1069 {
1070 enum resp_states rc;
1071 u32 prev_psn = (qp->resp.ack_psn - 1) & BTH_PSN_MASK;
1072
1073 if (pkt->mask & RXE_SEND_MASK ||
1074 pkt->mask & RXE_WRITE_MASK) {
1075 /* SEND. Ack again and cleanup. C9-105. */
1076 if (bth_ack(pkt))
1077 send_ack(qp, pkt, AETH_ACK_UNLIMITED, prev_psn);
1078 rc = RESPST_CLEANUP;
1079 goto out;
1080 } else if (pkt->mask & RXE_READ_MASK) {
1081 struct resp_res *res;
1082
1083 res = find_resource(qp, pkt->psn);
1084 if (!res) {
1085 /* Resource not found. Class D error. Drop the
1086 * request.
1087 */
1088 rc = RESPST_CLEANUP;
1089 goto out;
1090 } else {
1091 /* Ensure this new request is the same as the previous
1092 * one or a subset of it.
1093 */
1094 u64 iova = reth_va(pkt);
1095 u32 resid = reth_len(pkt);
1096
1097 if (iova < res->read.va_org ||
1098 resid > res->read.length ||
1099 (iova + resid) > (res->read.va_org +
1100 res->read.length)) {
1101 rc = RESPST_CLEANUP;
1102 goto out;
1103 }
1104
1105 if (reth_rkey(pkt) != res->read.rkey) {
1106 rc = RESPST_CLEANUP;
1107 goto out;
1108 }
1109
1110 res->cur_psn = pkt->psn;
1111 res->state = (pkt->psn == res->first_psn) ?
1112 rdatm_res_state_new :
1113 rdatm_res_state_replay;
1114 res->replay = 1;
1115
1116 /* Reset the resource, except length. */
1117 res->read.va_org = iova;
1118 res->read.va = iova;
1119 res->read.resid = resid;
1120
1121 /* Replay the RDMA read reply. */
1122 qp->resp.res = res;
1123 rc = RESPST_READ_REPLY;
1124 goto out;
1125 }
1126 } else {
1127 struct resp_res *res;
1128
1129 /* Find the operation in our list of responder resources. */
1130 res = find_resource(qp, pkt->psn);
1131 if (res) {
1132 skb_get(res->atomic.skb);
1133 /* Resend the result. */
1134 rc = rxe_xmit_packet(qp, pkt, res->atomic.skb);
1135 if (rc) {
1136 pr_err("Failed resending result. This flow is not handled - skb ignored\n");
1137 rc = RESPST_CLEANUP;
1138 goto out;
1139 }
1140 }
1141
1142 /* Resource not found. Class D error. Drop the request. */
1143 rc = RESPST_CLEANUP;
1144 goto out;
1145 }
1146 out:
1147 return rc;
1148 }
1149
1150 /* Process a class A or C. Both are treated the same in this implementation. */
1151 static void do_class_ac_error(struct rxe_qp *qp, u8 syndrome,
1152 enum ib_wc_status status)
1153 {
1154 qp->resp.aeth_syndrome = syndrome;
1155 qp->resp.status = status;
1156
1157 /* indicate that we should go through the ERROR state */
1158 qp->resp.goto_error = 1;
1159 }
1160
1161 static enum resp_states do_class_d1e_error(struct rxe_qp *qp)
1162 {
1163 /* UC */
1164 if (qp->srq) {
1165 /* Class E */
1166 qp->resp.drop_msg = 1;
1167 if (qp->resp.wqe) {
1168 qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1169 return RESPST_COMPLETE;
1170 } else {
1171 return RESPST_CLEANUP;
1172 }
1173 } else {
1174 /* Class D1. This packet may be the start of a
1175 * new message and could be valid. The previous
1176 * message is invalid and ignored. reset the
1177 * recv wr to its original state
1178 */
1179 if (qp->resp.wqe) {
1180 qp->resp.wqe->dma.resid = qp->resp.wqe->dma.length;
1181 qp->resp.wqe->dma.cur_sge = 0;
1182 qp->resp.wqe->dma.sge_offset = 0;
1183 qp->resp.opcode = -1;
1184 }
1185
1186 if (qp->resp.mr) {
1187 rxe_drop_ref(qp->resp.mr);
1188 qp->resp.mr = NULL;
1189 }
1190
1191 return RESPST_CLEANUP;
1192 }
1193 }
1194
1195 static void rxe_drain_req_pkts(struct rxe_qp *qp, bool notify)
1196 {
1197 struct sk_buff *skb;
1198
1199 while ((skb = skb_dequeue(&qp->req_pkts))) {
1200 rxe_drop_ref(qp);
1201 kfree_skb(skb);
1202 }
1203
1204 if (notify)
1205 return;
1206
1207 while (!qp->srq && qp->rq.queue && queue_head(qp->rq.queue))
1208 advance_consumer(qp->rq.queue);
1209 }
1210
1211 int rxe_responder(void *arg)
1212 {
1213 struct rxe_qp *qp = (struct rxe_qp *)arg;
1214 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
1215 enum resp_states state;
1216 struct rxe_pkt_info *pkt = NULL;
1217 int ret = 0;
1218
1219 rxe_add_ref(qp);
1220
1221 qp->resp.aeth_syndrome = AETH_ACK_UNLIMITED;
1222
1223 if (!qp->valid) {
1224 ret = -EINVAL;
1225 goto done;
1226 }
1227
1228 switch (qp->resp.state) {
1229 case QP_STATE_RESET:
1230 state = RESPST_RESET;
1231 break;
1232
1233 default:
1234 state = RESPST_GET_REQ;
1235 break;
1236 }
1237
1238 while (1) {
1239 pr_debug("qp#%d state = %s\n", qp_num(qp),
1240 resp_state_name[state]);
1241 switch (state) {
1242 case RESPST_GET_REQ:
1243 state = get_req(qp, &pkt);
1244 break;
1245 case RESPST_CHK_PSN:
1246 state = check_psn(qp, pkt);
1247 break;
1248 case RESPST_CHK_OP_SEQ:
1249 state = check_op_seq(qp, pkt);
1250 break;
1251 case RESPST_CHK_OP_VALID:
1252 state = check_op_valid(qp, pkt);
1253 break;
1254 case RESPST_CHK_RESOURCE:
1255 state = check_resource(qp, pkt);
1256 break;
1257 case RESPST_CHK_LENGTH:
1258 state = check_length(qp, pkt);
1259 break;
1260 case RESPST_CHK_RKEY:
1261 state = check_rkey(qp, pkt);
1262 break;
1263 case RESPST_EXECUTE:
1264 state = execute(qp, pkt);
1265 break;
1266 case RESPST_COMPLETE:
1267 state = do_complete(qp, pkt);
1268 break;
1269 case RESPST_READ_REPLY:
1270 state = read_reply(qp, pkt);
1271 break;
1272 case RESPST_ACKNOWLEDGE:
1273 state = acknowledge(qp, pkt);
1274 break;
1275 case RESPST_CLEANUP:
1276 state = cleanup(qp, pkt);
1277 break;
1278 case RESPST_DUPLICATE_REQUEST:
1279 state = duplicate_request(qp, pkt);
1280 break;
1281 case RESPST_ERR_PSN_OUT_OF_SEQ:
1282 /* RC only - Class B. Drop packet. */
1283 send_ack(qp, pkt, AETH_NAK_PSN_SEQ_ERROR, qp->resp.psn);
1284 state = RESPST_CLEANUP;
1285 break;
1286
1287 case RESPST_ERR_TOO_MANY_RDMA_ATM_REQ:
1288 case RESPST_ERR_MISSING_OPCODE_FIRST:
1289 case RESPST_ERR_MISSING_OPCODE_LAST_C:
1290 case RESPST_ERR_UNSUPPORTED_OPCODE:
1291 case RESPST_ERR_MISALIGNED_ATOMIC:
1292 /* RC Only - Class C. */
1293 do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1294 IB_WC_REM_INV_REQ_ERR);
1295 state = RESPST_COMPLETE;
1296 break;
1297
1298 case RESPST_ERR_MISSING_OPCODE_LAST_D1E:
1299 state = do_class_d1e_error(qp);
1300 break;
1301 case RESPST_ERR_RNR:
1302 if (qp_type(qp) == IB_QPT_RC) {
1303 rxe_counter_inc(rxe, RXE_CNT_SND_RNR);
1304 /* RC - class B */
1305 send_ack(qp, pkt, AETH_RNR_NAK |
1306 (~AETH_TYPE_MASK &
1307 qp->attr.min_rnr_timer),
1308 pkt->psn);
1309 } else {
1310 /* UD/UC - class D */
1311 qp->resp.drop_msg = 1;
1312 }
1313 state = RESPST_CLEANUP;
1314 break;
1315
1316 case RESPST_ERR_RKEY_VIOLATION:
1317 if (qp_type(qp) == IB_QPT_RC) {
1318 /* Class C */
1319 do_class_ac_error(qp, AETH_NAK_REM_ACC_ERR,
1320 IB_WC_REM_ACCESS_ERR);
1321 state = RESPST_COMPLETE;
1322 } else {
1323 qp->resp.drop_msg = 1;
1324 if (qp->srq) {
1325 /* UC/SRQ Class D */
1326 qp->resp.status = IB_WC_REM_ACCESS_ERR;
1327 state = RESPST_COMPLETE;
1328 } else {
1329 /* UC/non-SRQ Class E. */
1330 state = RESPST_CLEANUP;
1331 }
1332 }
1333 break;
1334
1335 case RESPST_ERR_LENGTH:
1336 if (qp_type(qp) == IB_QPT_RC) {
1337 /* Class C */
1338 do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1339 IB_WC_REM_INV_REQ_ERR);
1340 state = RESPST_COMPLETE;
1341 } else if (qp->srq) {
1342 /* UC/UD - class E */
1343 qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1344 state = RESPST_COMPLETE;
1345 } else {
1346 /* UC/UD - class D */
1347 qp->resp.drop_msg = 1;
1348 state = RESPST_CLEANUP;
1349 }
1350 break;
1351
1352 case RESPST_ERR_MALFORMED_WQE:
1353 /* All, Class A. */
1354 do_class_ac_error(qp, AETH_NAK_REM_OP_ERR,
1355 IB_WC_LOC_QP_OP_ERR);
1356 state = RESPST_COMPLETE;
1357 break;
1358
1359 case RESPST_ERR_CQ_OVERFLOW:
1360 /* All - Class G */
1361 state = RESPST_ERROR;
1362 break;
1363
1364 case RESPST_DONE:
1365 if (qp->resp.goto_error) {
1366 state = RESPST_ERROR;
1367 break;
1368 }
1369
1370 goto done;
1371
1372 case RESPST_EXIT:
1373 if (qp->resp.goto_error) {
1374 state = RESPST_ERROR;
1375 break;
1376 }
1377
1378 goto exit;
1379
1380 case RESPST_RESET:
1381 rxe_drain_req_pkts(qp, false);
1382 qp->resp.wqe = NULL;
1383 goto exit;
1384
1385 case RESPST_ERROR:
1386 qp->resp.goto_error = 0;
1387 pr_warn("qp#%d moved to error state\n", qp_num(qp));
1388 rxe_qp_error(qp);
1389 goto exit;
1390
1391 default:
1392 WARN_ON_ONCE(1);
1393 }
1394 }
1395
1396 exit:
1397 ret = -EAGAIN;
1398 done:
1399 rxe_drop_ref(qp);
1400 return ret;
1401 }
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