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Merge tag 'for-linus-20170825' of git://git.infradead.org/linux-mtd
[mirror_ubuntu-artful-kernel.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 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 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
515
516 err = copy_data(rxe, qp->pd, IB_ACCESS_LOCAL_WRITE, &qp->resp.wqe->dma,
517 data_addr, data_len, to_mem_obj, NULL);
518 if (unlikely(err))
519 return (err == -ENOSPC) ? RESPST_ERR_LENGTH
520 : RESPST_ERR_MALFORMED_WQE;
521
522 return RESPST_NONE;
523 }
524
525 static enum resp_states write_data_in(struct rxe_qp *qp,
526 struct rxe_pkt_info *pkt)
527 {
528 enum resp_states rc = RESPST_NONE;
529 int err;
530 int data_len = payload_size(pkt);
531
532 err = rxe_mem_copy(qp->resp.mr, qp->resp.va, payload_addr(pkt),
533 data_len, to_mem_obj, NULL);
534 if (err) {
535 rc = RESPST_ERR_RKEY_VIOLATION;
536 goto out;
537 }
538
539 qp->resp.va += data_len;
540 qp->resp.resid -= data_len;
541
542 out:
543 return rc;
544 }
545
546 /* Guarantee atomicity of atomic operations at the machine level. */
547 static DEFINE_SPINLOCK(atomic_ops_lock);
548
549 static enum resp_states process_atomic(struct rxe_qp *qp,
550 struct rxe_pkt_info *pkt)
551 {
552 u64 iova = atmeth_va(pkt);
553 u64 *vaddr;
554 enum resp_states ret;
555 struct rxe_mem *mr = qp->resp.mr;
556
557 if (mr->state != RXE_MEM_STATE_VALID) {
558 ret = RESPST_ERR_RKEY_VIOLATION;
559 goto out;
560 }
561
562 vaddr = iova_to_vaddr(mr, iova, sizeof(u64));
563
564 /* check vaddr is 8 bytes aligned. */
565 if (!vaddr || (uintptr_t)vaddr & 7) {
566 ret = RESPST_ERR_MISALIGNED_ATOMIC;
567 goto out;
568 }
569
570 spin_lock_bh(&atomic_ops_lock);
571
572 qp->resp.atomic_orig = *vaddr;
573
574 if (pkt->opcode == IB_OPCODE_RC_COMPARE_SWAP ||
575 pkt->opcode == IB_OPCODE_RD_COMPARE_SWAP) {
576 if (*vaddr == atmeth_comp(pkt))
577 *vaddr = atmeth_swap_add(pkt);
578 } else {
579 *vaddr += atmeth_swap_add(pkt);
580 }
581
582 spin_unlock_bh(&atomic_ops_lock);
583
584 ret = RESPST_NONE;
585 out:
586 return ret;
587 }
588
589 static struct sk_buff *prepare_ack_packet(struct rxe_qp *qp,
590 struct rxe_pkt_info *pkt,
591 struct rxe_pkt_info *ack,
592 int opcode,
593 int payload,
594 u32 psn,
595 u8 syndrome,
596 u32 *crcp)
597 {
598 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
599 struct sk_buff *skb;
600 u32 crc = 0;
601 u32 *p;
602 int paylen;
603 int pad;
604 int err;
605
606 /*
607 * allocate packet
608 */
609 pad = (-payload) & 0x3;
610 paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE;
611
612 skb = rxe_init_packet(rxe, &qp->pri_av, paylen, ack);
613 if (!skb)
614 return NULL;
615
616 ack->qp = qp;
617 ack->opcode = opcode;
618 ack->mask = rxe_opcode[opcode].mask;
619 ack->offset = pkt->offset;
620 ack->paylen = paylen;
621
622 /* fill in bth using the request packet headers */
623 memcpy(ack->hdr, pkt->hdr, pkt->offset + RXE_BTH_BYTES);
624
625 bth_set_opcode(ack, opcode);
626 bth_set_qpn(ack, qp->attr.dest_qp_num);
627 bth_set_pad(ack, pad);
628 bth_set_se(ack, 0);
629 bth_set_psn(ack, psn);
630 bth_set_ack(ack, 0);
631 ack->psn = psn;
632
633 if (ack->mask & RXE_AETH_MASK) {
634 aeth_set_syn(ack, syndrome);
635 aeth_set_msn(ack, qp->resp.msn);
636 }
637
638 if (ack->mask & RXE_ATMACK_MASK)
639 atmack_set_orig(ack, qp->resp.atomic_orig);
640
641 err = rxe_prepare(rxe, ack, skb, &crc);
642 if (err) {
643 kfree_skb(skb);
644 return NULL;
645 }
646
647 if (crcp) {
648 /* CRC computation will be continued by the caller */
649 *crcp = crc;
650 } else {
651 p = payload_addr(ack) + payload + bth_pad(ack);
652 *p = ~crc;
653 }
654
655 return skb;
656 }
657
658 /* RDMA read response. If res is not NULL, then we have a current RDMA request
659 * being processed or replayed.
660 */
661 static enum resp_states read_reply(struct rxe_qp *qp,
662 struct rxe_pkt_info *req_pkt)
663 {
664 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
665 struct rxe_pkt_info ack_pkt;
666 struct sk_buff *skb;
667 int mtu = qp->mtu;
668 enum resp_states state;
669 int payload;
670 int opcode;
671 int err;
672 struct resp_res *res = qp->resp.res;
673 u32 icrc;
674 u32 *p;
675
676 if (!res) {
677 /* This is the first time we process that request. Get a
678 * resource
679 */
680 res = &qp->resp.resources[qp->resp.res_head];
681
682 free_rd_atomic_resource(qp, res);
683 rxe_advance_resp_resource(qp);
684
685 res->type = RXE_READ_MASK;
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 kfree_skb(skb);
746 return RESPST_ERR_RNR;
747 }
748
749 res->read.va += payload;
750 res->read.resid -= payload;
751 res->cur_psn = (res->cur_psn + 1) & BTH_PSN_MASK;
752
753 if (res->read.resid > 0) {
754 state = RESPST_DONE;
755 } else {
756 qp->resp.res = NULL;
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
820 qp->resp.opcode = pkt->opcode;
821 qp->resp.status = IB_WC_SUCCESS;
822
823 if (pkt->mask & RXE_COMP_MASK) {
824 /* We successfully processed this new request. */
825 qp->resp.msn++;
826 return RESPST_COMPLETE;
827 } else if (qp_type(qp) == IB_QPT_RC)
828 return RESPST_ACKNOWLEDGE;
829 else
830 return RESPST_CLEANUP;
831 }
832
833 static enum resp_states do_complete(struct rxe_qp *qp,
834 struct rxe_pkt_info *pkt)
835 {
836 struct rxe_cqe cqe;
837 struct ib_wc *wc = &cqe.ibwc;
838 struct ib_uverbs_wc *uwc = &cqe.uibwc;
839 struct rxe_recv_wqe *wqe = qp->resp.wqe;
840
841 if (unlikely(!wqe))
842 return RESPST_CLEANUP;
843
844 memset(&cqe, 0, sizeof(cqe));
845
846 wc->wr_id = wqe->wr_id;
847 wc->status = qp->resp.status;
848 wc->qp = &qp->ibqp;
849
850 /* fields after status are not required for errors */
851 if (wc->status == IB_WC_SUCCESS) {
852 wc->opcode = (pkt->mask & RXE_IMMDT_MASK &&
853 pkt->mask & RXE_WRITE_MASK) ?
854 IB_WC_RECV_RDMA_WITH_IMM : IB_WC_RECV;
855 wc->vendor_err = 0;
856 wc->byte_len = wqe->dma.length - wqe->dma.resid;
857
858 /* fields after byte_len are different between kernel and user
859 * space
860 */
861 if (qp->rcq->is_user) {
862 uwc->wc_flags = IB_WC_GRH;
863
864 if (pkt->mask & RXE_IMMDT_MASK) {
865 uwc->wc_flags |= IB_WC_WITH_IMM;
866 uwc->ex.imm_data =
867 (__u32 __force)immdt_imm(pkt);
868 }
869
870 if (pkt->mask & RXE_IETH_MASK) {
871 uwc->wc_flags |= IB_WC_WITH_INVALIDATE;
872 uwc->ex.invalidate_rkey = ieth_rkey(pkt);
873 }
874
875 uwc->qp_num = qp->ibqp.qp_num;
876
877 if (pkt->mask & RXE_DETH_MASK)
878 uwc->src_qp = deth_sqp(pkt);
879
880 uwc->port_num = qp->attr.port_num;
881 } else {
882 struct sk_buff *skb = PKT_TO_SKB(pkt);
883
884 wc->wc_flags = IB_WC_GRH | IB_WC_WITH_NETWORK_HDR_TYPE;
885 if (skb->protocol == htons(ETH_P_IP))
886 wc->network_hdr_type = RDMA_NETWORK_IPV4;
887 else
888 wc->network_hdr_type = RDMA_NETWORK_IPV6;
889
890 if (pkt->mask & RXE_IMMDT_MASK) {
891 wc->wc_flags |= IB_WC_WITH_IMM;
892 wc->ex.imm_data = immdt_imm(pkt);
893 }
894
895 if (pkt->mask & RXE_IETH_MASK) {
896 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
897 struct rxe_mem *rmr;
898
899 wc->wc_flags |= IB_WC_WITH_INVALIDATE;
900 wc->ex.invalidate_rkey = ieth_rkey(pkt);
901
902 rmr = rxe_pool_get_index(&rxe->mr_pool,
903 wc->ex.invalidate_rkey >> 8);
904 if (unlikely(!rmr)) {
905 pr_err("Bad rkey %#x invalidation\n",
906 wc->ex.invalidate_rkey);
907 return RESPST_ERROR;
908 }
909 rmr->state = RXE_MEM_STATE_FREE;
910 rxe_drop_ref(rmr);
911 }
912
913 wc->qp = &qp->ibqp;
914
915 if (pkt->mask & RXE_DETH_MASK)
916 wc->src_qp = deth_sqp(pkt);
917
918 wc->port_num = qp->attr.port_num;
919 }
920 }
921
922 /* have copy for srq and reference for !srq */
923 if (!qp->srq)
924 advance_consumer(qp->rq.queue);
925
926 qp->resp.wqe = NULL;
927
928 if (rxe_cq_post(qp->rcq, &cqe, pkt ? bth_se(pkt) : 1))
929 return RESPST_ERR_CQ_OVERFLOW;
930
931 if (qp->resp.state == QP_STATE_ERROR)
932 return RESPST_CHK_RESOURCE;
933
934 if (!pkt)
935 return RESPST_DONE;
936 else if (qp_type(qp) == IB_QPT_RC)
937 return RESPST_ACKNOWLEDGE;
938 else
939 return RESPST_CLEANUP;
940 }
941
942 static int send_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
943 u8 syndrome, u32 psn)
944 {
945 int err = 0;
946 struct rxe_pkt_info ack_pkt;
947 struct sk_buff *skb;
948 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
949
950 skb = prepare_ack_packet(qp, pkt, &ack_pkt, IB_OPCODE_RC_ACKNOWLEDGE,
951 0, psn, syndrome, NULL);
952 if (!skb) {
953 err = -ENOMEM;
954 goto err1;
955 }
956
957 err = rxe_xmit_packet(rxe, qp, &ack_pkt, skb);
958 if (err) {
959 pr_err_ratelimited("Failed sending ack\n");
960 kfree_skb(skb);
961 }
962
963 err1:
964 return err;
965 }
966
967 static int send_atomic_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
968 u8 syndrome)
969 {
970 int rc = 0;
971 struct rxe_pkt_info ack_pkt;
972 struct sk_buff *skb;
973 struct sk_buff *skb_copy;
974 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
975 struct resp_res *res;
976
977 skb = prepare_ack_packet(qp, pkt, &ack_pkt,
978 IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE, 0, pkt->psn,
979 syndrome, NULL);
980 if (!skb) {
981 rc = -ENOMEM;
982 goto out;
983 }
984
985 skb_copy = skb_clone(skb, GFP_ATOMIC);
986 if (skb_copy)
987 rxe_add_ref(qp); /* for the new SKB */
988 else {
989 pr_warn("Could not clone atomic response\n");
990 rc = -ENOMEM;
991 goto out;
992 }
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 res->type = RXE_ATOMIC_MASK;
1003 res->atomic.skb = skb;
1004 res->first_psn = ack_pkt.psn;
1005 res->last_psn = ack_pkt.psn;
1006 res->cur_psn = ack_pkt.psn;
1007
1008 rc = rxe_xmit_packet(rxe, qp, &ack_pkt, skb_copy);
1009 if (rc) {
1010 pr_err_ratelimited("Failed sending ack\n");
1011 rxe_drop_ref(qp);
1012 kfree_skb(skb_copy);
1013 }
1014
1015 out:
1016 return rc;
1017 }
1018
1019 static enum resp_states acknowledge(struct rxe_qp *qp,
1020 struct rxe_pkt_info *pkt)
1021 {
1022 if (qp_type(qp) != IB_QPT_RC)
1023 return RESPST_CLEANUP;
1024
1025 if (qp->resp.aeth_syndrome != AETH_ACK_UNLIMITED)
1026 send_ack(qp, pkt, qp->resp.aeth_syndrome, pkt->psn);
1027 else if (pkt->mask & RXE_ATOMIC_MASK)
1028 send_atomic_ack(qp, pkt, AETH_ACK_UNLIMITED);
1029 else if (bth_ack(pkt))
1030 send_ack(qp, pkt, AETH_ACK_UNLIMITED, pkt->psn);
1031
1032 return RESPST_CLEANUP;
1033 }
1034
1035 static enum resp_states cleanup(struct rxe_qp *qp,
1036 struct rxe_pkt_info *pkt)
1037 {
1038 struct sk_buff *skb;
1039
1040 if (pkt) {
1041 skb = skb_dequeue(&qp->req_pkts);
1042 rxe_drop_ref(qp);
1043 kfree_skb(skb);
1044 }
1045
1046 if (qp->resp.mr) {
1047 rxe_drop_ref(qp->resp.mr);
1048 qp->resp.mr = NULL;
1049 }
1050
1051 return RESPST_DONE;
1052 }
1053
1054 static struct resp_res *find_resource(struct rxe_qp *qp, u32 psn)
1055 {
1056 int i;
1057
1058 for (i = 0; i < qp->attr.max_rd_atomic; i++) {
1059 struct resp_res *res = &qp->resp.resources[i];
1060
1061 if (res->type == 0)
1062 continue;
1063
1064 if (psn_compare(psn, res->first_psn) >= 0 &&
1065 psn_compare(psn, res->last_psn) <= 0) {
1066 return res;
1067 }
1068 }
1069
1070 return NULL;
1071 }
1072
1073 static enum resp_states duplicate_request(struct rxe_qp *qp,
1074 struct rxe_pkt_info *pkt)
1075 {
1076 enum resp_states rc;
1077 u32 prev_psn = (qp->resp.psn - 1) & BTH_PSN_MASK;
1078
1079 if (pkt->mask & RXE_SEND_MASK ||
1080 pkt->mask & RXE_WRITE_MASK) {
1081 /* SEND. Ack again and cleanup. C9-105. */
1082 if (bth_ack(pkt))
1083 send_ack(qp, pkt, AETH_ACK_UNLIMITED, prev_psn);
1084 rc = RESPST_CLEANUP;
1085 goto out;
1086 } else if (pkt->mask & RXE_READ_MASK) {
1087 struct resp_res *res;
1088
1089 res = find_resource(qp, pkt->psn);
1090 if (!res) {
1091 /* Resource not found. Class D error. Drop the
1092 * request.
1093 */
1094 rc = RESPST_CLEANUP;
1095 goto out;
1096 } else {
1097 /* Ensure this new request is the same as the previous
1098 * one or a subset of it.
1099 */
1100 u64 iova = reth_va(pkt);
1101 u32 resid = reth_len(pkt);
1102
1103 if (iova < res->read.va_org ||
1104 resid > res->read.length ||
1105 (iova + resid) > (res->read.va_org +
1106 res->read.length)) {
1107 rc = RESPST_CLEANUP;
1108 goto out;
1109 }
1110
1111 if (reth_rkey(pkt) != res->read.rkey) {
1112 rc = RESPST_CLEANUP;
1113 goto out;
1114 }
1115
1116 res->cur_psn = pkt->psn;
1117 res->state = (pkt->psn == res->first_psn) ?
1118 rdatm_res_state_new :
1119 rdatm_res_state_replay;
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 struct sk_buff *skb_copy;
1138
1139 skb_copy = skb_clone(res->atomic.skb, GFP_ATOMIC);
1140 if (skb_copy) {
1141 rxe_add_ref(qp); /* for the new SKB */
1142 } else {
1143 pr_warn("Couldn't clone atomic resp\n");
1144 rc = RESPST_CLEANUP;
1145 goto out;
1146 }
1147
1148 /* Resend the result. */
1149 rc = rxe_xmit_packet(to_rdev(qp->ibqp.device), qp,
1150 pkt, skb_copy);
1151 if (rc) {
1152 pr_err("Failed resending result. This flow is not handled - skb ignored\n");
1153 rxe_drop_ref(qp);
1154 kfree_skb(skb_copy);
1155 rc = RESPST_CLEANUP;
1156 goto out;
1157 }
1158 }
1159
1160 /* Resource not found. Class D error. Drop the request. */
1161 rc = RESPST_CLEANUP;
1162 goto out;
1163 }
1164 out:
1165 return rc;
1166 }
1167
1168 /* Process a class A or C. Both are treated the same in this implementation. */
1169 static void do_class_ac_error(struct rxe_qp *qp, u8 syndrome,
1170 enum ib_wc_status status)
1171 {
1172 qp->resp.aeth_syndrome = syndrome;
1173 qp->resp.status = status;
1174
1175 /* indicate that we should go through the ERROR state */
1176 qp->resp.goto_error = 1;
1177 }
1178
1179 static enum resp_states do_class_d1e_error(struct rxe_qp *qp)
1180 {
1181 /* UC */
1182 if (qp->srq) {
1183 /* Class E */
1184 qp->resp.drop_msg = 1;
1185 if (qp->resp.wqe) {
1186 qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1187 return RESPST_COMPLETE;
1188 } else {
1189 return RESPST_CLEANUP;
1190 }
1191 } else {
1192 /* Class D1. This packet may be the start of a
1193 * new message and could be valid. The previous
1194 * message is invalid and ignored. reset the
1195 * recv wr to its original state
1196 */
1197 if (qp->resp.wqe) {
1198 qp->resp.wqe->dma.resid = qp->resp.wqe->dma.length;
1199 qp->resp.wqe->dma.cur_sge = 0;
1200 qp->resp.wqe->dma.sge_offset = 0;
1201 qp->resp.opcode = -1;
1202 }
1203
1204 if (qp->resp.mr) {
1205 rxe_drop_ref(qp->resp.mr);
1206 qp->resp.mr = NULL;
1207 }
1208
1209 return RESPST_CLEANUP;
1210 }
1211 }
1212
1213 void rxe_drain_req_pkts(struct rxe_qp *qp, bool notify)
1214 {
1215 struct sk_buff *skb;
1216
1217 while ((skb = skb_dequeue(&qp->req_pkts))) {
1218 rxe_drop_ref(qp);
1219 kfree_skb(skb);
1220 }
1221
1222 if (notify)
1223 return;
1224
1225 while (!qp->srq && qp->rq.queue && queue_head(qp->rq.queue))
1226 advance_consumer(qp->rq.queue);
1227 }
1228
1229 int rxe_responder(void *arg)
1230 {
1231 struct rxe_qp *qp = (struct rxe_qp *)arg;
1232 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
1233 enum resp_states state;
1234 struct rxe_pkt_info *pkt = NULL;
1235 int ret = 0;
1236
1237 rxe_add_ref(qp);
1238
1239 qp->resp.aeth_syndrome = AETH_ACK_UNLIMITED;
1240
1241 if (!qp->valid) {
1242 ret = -EINVAL;
1243 goto done;
1244 }
1245
1246 switch (qp->resp.state) {
1247 case QP_STATE_RESET:
1248 state = RESPST_RESET;
1249 break;
1250
1251 default:
1252 state = RESPST_GET_REQ;
1253 break;
1254 }
1255
1256 while (1) {
1257 pr_debug("qp#%d state = %s\n", qp_num(qp),
1258 resp_state_name[state]);
1259 switch (state) {
1260 case RESPST_GET_REQ:
1261 state = get_req(qp, &pkt);
1262 break;
1263 case RESPST_CHK_PSN:
1264 state = check_psn(qp, pkt);
1265 break;
1266 case RESPST_CHK_OP_SEQ:
1267 state = check_op_seq(qp, pkt);
1268 break;
1269 case RESPST_CHK_OP_VALID:
1270 state = check_op_valid(qp, pkt);
1271 break;
1272 case RESPST_CHK_RESOURCE:
1273 state = check_resource(qp, pkt);
1274 break;
1275 case RESPST_CHK_LENGTH:
1276 state = check_length(qp, pkt);
1277 break;
1278 case RESPST_CHK_RKEY:
1279 state = check_rkey(qp, pkt);
1280 break;
1281 case RESPST_EXECUTE:
1282 state = execute(qp, pkt);
1283 break;
1284 case RESPST_COMPLETE:
1285 state = do_complete(qp, pkt);
1286 break;
1287 case RESPST_READ_REPLY:
1288 state = read_reply(qp, pkt);
1289 break;
1290 case RESPST_ACKNOWLEDGE:
1291 state = acknowledge(qp, pkt);
1292 break;
1293 case RESPST_CLEANUP:
1294 state = cleanup(qp, pkt);
1295 break;
1296 case RESPST_DUPLICATE_REQUEST:
1297 state = duplicate_request(qp, pkt);
1298 break;
1299 case RESPST_ERR_PSN_OUT_OF_SEQ:
1300 /* RC only - Class B. Drop packet. */
1301 send_ack(qp, pkt, AETH_NAK_PSN_SEQ_ERROR, qp->resp.psn);
1302 state = RESPST_CLEANUP;
1303 break;
1304
1305 case RESPST_ERR_TOO_MANY_RDMA_ATM_REQ:
1306 case RESPST_ERR_MISSING_OPCODE_FIRST:
1307 case RESPST_ERR_MISSING_OPCODE_LAST_C:
1308 case RESPST_ERR_UNSUPPORTED_OPCODE:
1309 case RESPST_ERR_MISALIGNED_ATOMIC:
1310 /* RC Only - Class C. */
1311 do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1312 IB_WC_REM_INV_REQ_ERR);
1313 state = RESPST_COMPLETE;
1314 break;
1315
1316 case RESPST_ERR_MISSING_OPCODE_LAST_D1E:
1317 state = do_class_d1e_error(qp);
1318 break;
1319 case RESPST_ERR_RNR:
1320 if (qp_type(qp) == IB_QPT_RC) {
1321 rxe_counter_inc(rxe, RXE_CNT_SND_RNR);
1322 /* RC - class B */
1323 send_ack(qp, pkt, AETH_RNR_NAK |
1324 (~AETH_TYPE_MASK &
1325 qp->attr.min_rnr_timer),
1326 pkt->psn);
1327 } else {
1328 /* UD/UC - class D */
1329 qp->resp.drop_msg = 1;
1330 }
1331 state = RESPST_CLEANUP;
1332 break;
1333
1334 case RESPST_ERR_RKEY_VIOLATION:
1335 if (qp_type(qp) == IB_QPT_RC) {
1336 /* Class C */
1337 do_class_ac_error(qp, AETH_NAK_REM_ACC_ERR,
1338 IB_WC_REM_ACCESS_ERR);
1339 state = RESPST_COMPLETE;
1340 } else {
1341 qp->resp.drop_msg = 1;
1342 if (qp->srq) {
1343 /* UC/SRQ Class D */
1344 qp->resp.status = IB_WC_REM_ACCESS_ERR;
1345 state = RESPST_COMPLETE;
1346 } else {
1347 /* UC/non-SRQ Class E. */
1348 state = RESPST_CLEANUP;
1349 }
1350 }
1351 break;
1352
1353 case RESPST_ERR_LENGTH:
1354 if (qp_type(qp) == IB_QPT_RC) {
1355 /* Class C */
1356 do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1357 IB_WC_REM_INV_REQ_ERR);
1358 state = RESPST_COMPLETE;
1359 } else if (qp->srq) {
1360 /* UC/UD - class E */
1361 qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1362 state = RESPST_COMPLETE;
1363 } else {
1364 /* UC/UD - class D */
1365 qp->resp.drop_msg = 1;
1366 state = RESPST_CLEANUP;
1367 }
1368 break;
1369
1370 case RESPST_ERR_MALFORMED_WQE:
1371 /* All, Class A. */
1372 do_class_ac_error(qp, AETH_NAK_REM_OP_ERR,
1373 IB_WC_LOC_QP_OP_ERR);
1374 state = RESPST_COMPLETE;
1375 break;
1376
1377 case RESPST_ERR_CQ_OVERFLOW:
1378 /* All - Class G */
1379 state = RESPST_ERROR;
1380 break;
1381
1382 case RESPST_DONE:
1383 if (qp->resp.goto_error) {
1384 state = RESPST_ERROR;
1385 break;
1386 }
1387
1388 goto done;
1389
1390 case RESPST_EXIT:
1391 if (qp->resp.goto_error) {
1392 state = RESPST_ERROR;
1393 break;
1394 }
1395
1396 goto exit;
1397
1398 case RESPST_RESET:
1399 rxe_drain_req_pkts(qp, false);
1400 qp->resp.wqe = NULL;
1401 goto exit;
1402
1403 case RESPST_ERROR:
1404 qp->resp.goto_error = 0;
1405 pr_warn("qp#%d moved to error state\n", qp_num(qp));
1406 rxe_qp_error(qp);
1407 goto exit;
1408
1409 default:
1410 WARN_ON_ONCE(1);
1411 }
1412 }
1413
1414 exit:
1415 ret = -EAGAIN;
1416 done:
1417 rxe_drop_ref(qp);
1418 return ret;
1419 }
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