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media: stv06xx: add missing descriptor sanity checks
[linux/fpc-iii.git] / drivers / infiniband / sw / rxe / rxe_resp.c
blobc4a8195bf670945ef017837337598f3eb0cdc8e3
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 qp->resp.length = 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 if (bth_pad(&ack_pkt)) {
736 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
737 u8 *pad = payload_addr(&ack_pkt) + payload;
738
739 memset(pad, 0, bth_pad(&ack_pkt));
740 icrc = rxe_crc32(rxe, icrc, pad, bth_pad(&ack_pkt));
741 }
742 p = payload_addr(&ack_pkt) + payload + bth_pad(&ack_pkt);
743 *p = ~icrc;
744
745 err = rxe_xmit_packet(qp, &ack_pkt, skb);
746 if (err) {
747 pr_err("Failed sending RDMA reply.\n");
748 return RESPST_ERR_RNR;
749 }
750
751 res->read.va += payload;
752 res->read.resid -= payload;
753 res->cur_psn = (res->cur_psn + 1) & BTH_PSN_MASK;
754
755 if (res->read.resid > 0) {
756 state = RESPST_DONE;
757 } else {
758 qp->resp.res = NULL;
759 if (!res->replay)
760 qp->resp.opcode = -1;
761 if (psn_compare(res->cur_psn, qp->resp.psn) >= 0)
762 qp->resp.psn = res->cur_psn;
763 state = RESPST_CLEANUP;
764 }
765
766 return state;
767 }
768
769 static void build_rdma_network_hdr(union rdma_network_hdr *hdr,
770 struct rxe_pkt_info *pkt)
771 {
772 struct sk_buff *skb = PKT_TO_SKB(pkt);
773
774 memset(hdr, 0, sizeof(*hdr));
775 if (skb->protocol == htons(ETH_P_IP))
776 memcpy(&hdr->roce4grh, ip_hdr(skb), sizeof(hdr->roce4grh));
777 else if (skb->protocol == htons(ETH_P_IPV6))
778 memcpy(&hdr->ibgrh, ipv6_hdr(skb), sizeof(hdr->ibgrh));
779 }
780
781 /* Executes a new request. A retried request never reach that function (send
782 * and writes are discarded, and reads and atomics are retried elsewhere.
783 */
784 static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt)
785 {
786 enum resp_states err;
787
788 if (pkt->mask & RXE_SEND_MASK) {
789 if (qp_type(qp) == IB_QPT_UD ||
790 qp_type(qp) == IB_QPT_SMI ||
791 qp_type(qp) == IB_QPT_GSI) {
792 union rdma_network_hdr hdr;
793
794 build_rdma_network_hdr(&hdr, pkt);
795
796 err = send_data_in(qp, &hdr, sizeof(hdr));
797 if (err)
798 return err;
799 }
800 err = send_data_in(qp, payload_addr(pkt), payload_size(pkt));
801 if (err)
802 return err;
803 } else if (pkt->mask & RXE_WRITE_MASK) {
804 err = write_data_in(qp, pkt);
805 if (err)
806 return err;
807 } else if (pkt->mask & RXE_READ_MASK) {
808 /* For RDMA Read we can increment the msn now. See C9-148. */
809 qp->resp.msn++;
810 return RESPST_READ_REPLY;
811 } else if (pkt->mask & RXE_ATOMIC_MASK) {
812 err = process_atomic(qp, pkt);
813 if (err)
814 return err;
815 } else {
816 /* Unreachable */
817 WARN_ON_ONCE(1);
818 }
819
820 /* next expected psn, read handles this separately */
821 qp->resp.psn = (pkt->psn + 1) & BTH_PSN_MASK;
822 qp->resp.ack_psn = qp->resp.psn;
823
824 qp->resp.opcode = pkt->opcode;
825 qp->resp.status = IB_WC_SUCCESS;
826
827 if (pkt->mask & RXE_COMP_MASK) {
828 /* We successfully processed this new request. */
829 qp->resp.msn++;
830 return RESPST_COMPLETE;
831 } else if (qp_type(qp) == IB_QPT_RC)
832 return RESPST_ACKNOWLEDGE;
833 else
834 return RESPST_CLEANUP;
835 }
836
837 static enum resp_states do_complete(struct rxe_qp *qp,
838 struct rxe_pkt_info *pkt)
839 {
840 struct rxe_cqe cqe;
841 struct ib_wc *wc = &cqe.ibwc;
842 struct ib_uverbs_wc *uwc = &cqe.uibwc;
843 struct rxe_recv_wqe *wqe = qp->resp.wqe;
844 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
845
846 if (unlikely(!wqe))
847 return RESPST_CLEANUP;
848
849 memset(&cqe, 0, sizeof(cqe));
850
851 if (qp->rcq->is_user) {
852 uwc->status = qp->resp.status;
853 uwc->qp_num = qp->ibqp.qp_num;
854 uwc->wr_id = wqe->wr_id;
855 } else {
856 wc->status = qp->resp.status;
857 wc->qp = &qp->ibqp;
858 wc->wr_id = wqe->wr_id;
859 }
860
861 if (wc->status == IB_WC_SUCCESS) {
862 rxe_counter_inc(rxe, RXE_CNT_RDMA_RECV);
863 wc->opcode = (pkt->mask & RXE_IMMDT_MASK &&
864 pkt->mask & RXE_WRITE_MASK) ?
865 IB_WC_RECV_RDMA_WITH_IMM : IB_WC_RECV;
866 wc->vendor_err = 0;
867 wc->byte_len = (pkt->mask & RXE_IMMDT_MASK &&
868 pkt->mask & RXE_WRITE_MASK) ?
869 qp->resp.length : wqe->dma.length - wqe->dma.resid;
870
871 /* fields after byte_len are different between kernel and user
872 * space
873 */
874 if (qp->rcq->is_user) {
875 uwc->wc_flags = IB_WC_GRH;
876
877 if (pkt->mask & RXE_IMMDT_MASK) {
878 uwc->wc_flags |= IB_WC_WITH_IMM;
879 uwc->ex.imm_data = immdt_imm(pkt);
880 }
881
882 if (pkt->mask & RXE_IETH_MASK) {
883 uwc->wc_flags |= IB_WC_WITH_INVALIDATE;
884 uwc->ex.invalidate_rkey = ieth_rkey(pkt);
885 }
886
887 uwc->qp_num = qp->ibqp.qp_num;
888
889 if (pkt->mask & RXE_DETH_MASK)
890 uwc->src_qp = deth_sqp(pkt);
891
892 uwc->port_num = qp->attr.port_num;
893 } else {
894 struct sk_buff *skb = PKT_TO_SKB(pkt);
895
896 wc->wc_flags = IB_WC_GRH | IB_WC_WITH_NETWORK_HDR_TYPE;
897 if (skb->protocol == htons(ETH_P_IP))
898 wc->network_hdr_type = RDMA_NETWORK_IPV4;
899 else
900 wc->network_hdr_type = RDMA_NETWORK_IPV6;
901
902 if (is_vlan_dev(skb->dev)) {
903 wc->wc_flags |= IB_WC_WITH_VLAN;
904 wc->vlan_id = vlan_dev_vlan_id(skb->dev);
905 }
906
907 if (pkt->mask & RXE_IMMDT_MASK) {
908 wc->wc_flags |= IB_WC_WITH_IMM;
909 wc->ex.imm_data = immdt_imm(pkt);
910 }
911
912 if (pkt->mask & RXE_IETH_MASK) {
913 struct rxe_mem *rmr;
914
915 wc->wc_flags |= IB_WC_WITH_INVALIDATE;
916 wc->ex.invalidate_rkey = ieth_rkey(pkt);
917
918 rmr = rxe_pool_get_index(&rxe->mr_pool,
919 wc->ex.invalidate_rkey >> 8);
920 if (unlikely(!rmr)) {
921 pr_err("Bad rkey %#x invalidation\n",
922 wc->ex.invalidate_rkey);
923 return RESPST_ERROR;
924 }
925 rmr->state = RXE_MEM_STATE_FREE;
926 rxe_drop_ref(rmr);
927 }
928
929 wc->qp = &qp->ibqp;
930
931 if (pkt->mask & RXE_DETH_MASK)
932 wc->src_qp = deth_sqp(pkt);
933
934 wc->port_num = qp->attr.port_num;
935 }
936 }
937
938 /* have copy for srq and reference for !srq */
939 if (!qp->srq)
940 advance_consumer(qp->rq.queue);
941
942 qp->resp.wqe = NULL;
943
944 if (rxe_cq_post(qp->rcq, &cqe, pkt ? bth_se(pkt) : 1))
945 return RESPST_ERR_CQ_OVERFLOW;
946
947 if (qp->resp.state == QP_STATE_ERROR)
948 return RESPST_CHK_RESOURCE;
949
950 if (!pkt)
951 return RESPST_DONE;
952 else if (qp_type(qp) == IB_QPT_RC)
953 return RESPST_ACKNOWLEDGE;
954 else
955 return RESPST_CLEANUP;
956 }
957
958 static int send_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
959 u8 syndrome, u32 psn)
960 {
961 int err = 0;
962 struct rxe_pkt_info ack_pkt;
963 struct sk_buff *skb;
964
965 skb = prepare_ack_packet(qp, pkt, &ack_pkt, IB_OPCODE_RC_ACKNOWLEDGE,
966 0, psn, syndrome, NULL);
967 if (!skb) {
968 err = -ENOMEM;
969 goto err1;
970 }
971
972 err = rxe_xmit_packet(qp, &ack_pkt, skb);
973 if (err)
974 pr_err_ratelimited("Failed sending ack\n");
975
976 err1:
977 return err;
978 }
979
980 static int send_atomic_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
981 u8 syndrome)
982 {
983 int rc = 0;
984 struct rxe_pkt_info ack_pkt;
985 struct sk_buff *skb;
986 struct resp_res *res;
987
988 skb = prepare_ack_packet(qp, pkt, &ack_pkt,
989 IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE, 0, pkt->psn,
990 syndrome, NULL);
991 if (!skb) {
992 rc = -ENOMEM;
993 goto out;
994 }
995
996 rxe_add_ref(qp);
997
998 res = &qp->resp.resources[qp->resp.res_head];
999 free_rd_atomic_resource(qp, res);
1000 rxe_advance_resp_resource(qp);
1001
1002 memcpy(SKB_TO_PKT(skb), &ack_pkt, sizeof(ack_pkt));
1003 memset((unsigned char *)SKB_TO_PKT(skb) + sizeof(ack_pkt), 0,
1004 sizeof(skb->cb) - sizeof(ack_pkt));
1005
1006 skb_get(skb);
1007 res->type = RXE_ATOMIC_MASK;
1008 res->atomic.skb = skb;
1009 res->first_psn = ack_pkt.psn;
1010 res->last_psn = ack_pkt.psn;
1011 res->cur_psn = ack_pkt.psn;
1012
1013 rc = rxe_xmit_packet(qp, &ack_pkt, skb);
1014 if (rc) {
1015 pr_err_ratelimited("Failed sending ack\n");
1016 rxe_drop_ref(qp);
1017 }
1018 out:
1019 return rc;
1020 }
1021
1022 static enum resp_states acknowledge(struct rxe_qp *qp,
1023 struct rxe_pkt_info *pkt)
1024 {
1025 if (qp_type(qp) != IB_QPT_RC)
1026 return RESPST_CLEANUP;
1027
1028 if (qp->resp.aeth_syndrome != AETH_ACK_UNLIMITED)
1029 send_ack(qp, pkt, qp->resp.aeth_syndrome, pkt->psn);
1030 else if (pkt->mask & RXE_ATOMIC_MASK)
1031 send_atomic_ack(qp, pkt, AETH_ACK_UNLIMITED);
1032 else if (bth_ack(pkt))
1033 send_ack(qp, pkt, AETH_ACK_UNLIMITED, pkt->psn);
1034
1035 return RESPST_CLEANUP;
1036 }
1037
1038 static enum resp_states cleanup(struct rxe_qp *qp,
1039 struct rxe_pkt_info *pkt)
1040 {
1041 struct sk_buff *skb;
1042
1043 if (pkt) {
1044 skb = skb_dequeue(&qp->req_pkts);
1045 rxe_drop_ref(qp);
1046 kfree_skb(skb);
1047 }
1048
1049 if (qp->resp.mr) {
1050 rxe_drop_ref(qp->resp.mr);
1051 qp->resp.mr = NULL;
1052 }
1053
1054 return RESPST_DONE;
1055 }
1056
1057 static struct resp_res *find_resource(struct rxe_qp *qp, u32 psn)
1058 {
1059 int i;
1060
1061 for (i = 0; i < qp->attr.max_dest_rd_atomic; i++) {
1062 struct resp_res *res = &qp->resp.resources[i];
1063
1064 if (res->type == 0)
1065 continue;
1066
1067 if (psn_compare(psn, res->first_psn) >= 0 &&
1068 psn_compare(psn, res->last_psn) <= 0) {
1069 return res;
1070 }
1071 }
1072
1073 return NULL;
1074 }
1075
1076 static enum resp_states duplicate_request(struct rxe_qp *qp,
1077 struct rxe_pkt_info *pkt)
1078 {
1079 enum resp_states rc;
1080 u32 prev_psn = (qp->resp.ack_psn - 1) & BTH_PSN_MASK;
1081
1082 if (pkt->mask & RXE_SEND_MASK ||
1083 pkt->mask & RXE_WRITE_MASK) {
1084 /* SEND. Ack again and cleanup. C9-105. */
1085 if (bth_ack(pkt))
1086 send_ack(qp, pkt, AETH_ACK_UNLIMITED, prev_psn);
1087 rc = RESPST_CLEANUP;
1088 goto out;
1089 } else if (pkt->mask & RXE_READ_MASK) {
1090 struct resp_res *res;
1091
1092 res = find_resource(qp, pkt->psn);
1093 if (!res) {
1094 /* Resource not found. Class D error. Drop the
1095 * request.
1096 */
1097 rc = RESPST_CLEANUP;
1098 goto out;
1099 } else {
1100 /* Ensure this new request is the same as the previous
1101 * one or a subset of it.
1102 */
1103 u64 iova = reth_va(pkt);
1104 u32 resid = reth_len(pkt);
1105
1106 if (iova < res->read.va_org ||
1107 resid > res->read.length ||
1108 (iova + resid) > (res->read.va_org +
1109 res->read.length)) {
1110 rc = RESPST_CLEANUP;
1111 goto out;
1112 }
1113
1114 if (reth_rkey(pkt) != res->read.rkey) {
1115 rc = RESPST_CLEANUP;
1116 goto out;
1117 }
1118
1119 res->cur_psn = pkt->psn;
1120 res->state = (pkt->psn == res->first_psn) ?
1121 rdatm_res_state_new :
1122 rdatm_res_state_replay;
1123 res->replay = 1;
1124
1125 /* Reset the resource, except length. */
1126 res->read.va_org = iova;
1127 res->read.va = iova;
1128 res->read.resid = resid;
1129
1130 /* Replay the RDMA read reply. */
1131 qp->resp.res = res;
1132 rc = RESPST_READ_REPLY;
1133 goto out;
1134 }
1135 } else {
1136 struct resp_res *res;
1137
1138 /* Find the operation in our list of responder resources. */
1139 res = find_resource(qp, pkt->psn);
1140 if (res) {
1141 skb_get(res->atomic.skb);
1142 /* Resend the result. */
1143 rc = rxe_xmit_packet(qp, pkt, res->atomic.skb);
1144 if (rc) {
1145 pr_err("Failed resending result. This flow is not handled - skb ignored\n");
1146 rc = RESPST_CLEANUP;
1147 goto out;
1148 }
1149 }
1150
1151 /* Resource not found. Class D error. Drop the request. */
1152 rc = RESPST_CLEANUP;
1153 goto out;
1154 }
1155 out:
1156 return rc;
1157 }
1158
1159 /* Process a class A or C. Both are treated the same in this implementation. */
1160 static void do_class_ac_error(struct rxe_qp *qp, u8 syndrome,
1161 enum ib_wc_status status)
1162 {
1163 qp->resp.aeth_syndrome = syndrome;
1164 qp->resp.status = status;
1165
1166 /* indicate that we should go through the ERROR state */
1167 qp->resp.goto_error = 1;
1168 }
1169
1170 static enum resp_states do_class_d1e_error(struct rxe_qp *qp)
1171 {
1172 /* UC */
1173 if (qp->srq) {
1174 /* Class E */
1175 qp->resp.drop_msg = 1;
1176 if (qp->resp.wqe) {
1177 qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1178 return RESPST_COMPLETE;
1179 } else {
1180 return RESPST_CLEANUP;
1181 }
1182 } else {
1183 /* Class D1. This packet may be the start of a
1184 * new message and could be valid. The previous
1185 * message is invalid and ignored. reset the
1186 * recv wr to its original state
1187 */
1188 if (qp->resp.wqe) {
1189 qp->resp.wqe->dma.resid = qp->resp.wqe->dma.length;
1190 qp->resp.wqe->dma.cur_sge = 0;
1191 qp->resp.wqe->dma.sge_offset = 0;
1192 qp->resp.opcode = -1;
1193 }
1194
1195 if (qp->resp.mr) {
1196 rxe_drop_ref(qp->resp.mr);
1197 qp->resp.mr = NULL;
1198 }
1199
1200 return RESPST_CLEANUP;
1201 }
1202 }
1203
1204 static void rxe_drain_req_pkts(struct rxe_qp *qp, bool notify)
1205 {
1206 struct sk_buff *skb;
1207
1208 while ((skb = skb_dequeue(&qp->req_pkts))) {
1209 rxe_drop_ref(qp);
1210 kfree_skb(skb);
1211 }
1212
1213 if (notify)
1214 return;
1215
1216 while (!qp->srq && qp->rq.queue && queue_head(qp->rq.queue))
1217 advance_consumer(qp->rq.queue);
1218 }
1219
1220 int rxe_responder(void *arg)
1221 {
1222 struct rxe_qp *qp = (struct rxe_qp *)arg;
1223 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
1224 enum resp_states state;
1225 struct rxe_pkt_info *pkt = NULL;
1226 int ret = 0;
1227
1228 rxe_add_ref(qp);
1229
1230 qp->resp.aeth_syndrome = AETH_ACK_UNLIMITED;
1231
1232 if (!qp->valid) {
1233 ret = -EINVAL;
1234 goto done;
1235 }
1236
1237 switch (qp->resp.state) {
1238 case QP_STATE_RESET:
1239 state = RESPST_RESET;
1240 break;
1241
1242 default:
1243 state = RESPST_GET_REQ;
1244 break;
1245 }
1246
1247 while (1) {
1248 pr_debug("qp#%d state = %s\n", qp_num(qp),
1249 resp_state_name[state]);
1250 switch (state) {
1251 case RESPST_GET_REQ:
1252 state = get_req(qp, &pkt);
1253 break;
1254 case RESPST_CHK_PSN:
1255 state = check_psn(qp, pkt);
1256 break;
1257 case RESPST_CHK_OP_SEQ:
1258 state = check_op_seq(qp, pkt);
1259 break;
1260 case RESPST_CHK_OP_VALID:
1261 state = check_op_valid(qp, pkt);
1262 break;
1263 case RESPST_CHK_RESOURCE:
1264 state = check_resource(qp, pkt);
1265 break;
1266 case RESPST_CHK_LENGTH:
1267 state = check_length(qp, pkt);
1268 break;
1269 case RESPST_CHK_RKEY:
1270 state = check_rkey(qp, pkt);
1271 break;
1272 case RESPST_EXECUTE:
1273 state = execute(qp, pkt);
1274 break;
1275 case RESPST_COMPLETE:
1276 state = do_complete(qp, pkt);
1277 break;
1278 case RESPST_READ_REPLY:
1279 state = read_reply(qp, pkt);
1280 break;
1281 case RESPST_ACKNOWLEDGE:
1282 state = acknowledge(qp, pkt);
1283 break;
1284 case RESPST_CLEANUP:
1285 state = cleanup(qp, pkt);
1286 break;
1287 case RESPST_DUPLICATE_REQUEST:
1288 state = duplicate_request(qp, pkt);
1289 break;
1290 case RESPST_ERR_PSN_OUT_OF_SEQ:
1291 /* RC only - Class B. Drop packet. */
1292 send_ack(qp, pkt, AETH_NAK_PSN_SEQ_ERROR, qp->resp.psn);
1293 state = RESPST_CLEANUP;
1294 break;
1295
1296 case RESPST_ERR_TOO_MANY_RDMA_ATM_REQ:
1297 case RESPST_ERR_MISSING_OPCODE_FIRST:
1298 case RESPST_ERR_MISSING_OPCODE_LAST_C:
1299 case RESPST_ERR_UNSUPPORTED_OPCODE:
1300 case RESPST_ERR_MISALIGNED_ATOMIC:
1301 /* RC Only - Class C. */
1302 do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1303 IB_WC_REM_INV_REQ_ERR);
1304 state = RESPST_COMPLETE;
1305 break;
1306
1307 case RESPST_ERR_MISSING_OPCODE_LAST_D1E:
1308 state = do_class_d1e_error(qp);
1309 break;
1310 case RESPST_ERR_RNR:
1311 if (qp_type(qp) == IB_QPT_RC) {
1312 rxe_counter_inc(rxe, RXE_CNT_SND_RNR);
1313 /* RC - class B */
1314 send_ack(qp, pkt, AETH_RNR_NAK |
1315 (~AETH_TYPE_MASK &
1316 qp->attr.min_rnr_timer),
1317 pkt->psn);
1318 } else {
1319 /* UD/UC - class D */
1320 qp->resp.drop_msg = 1;
1321 }
1322 state = RESPST_CLEANUP;
1323 break;
1324
1325 case RESPST_ERR_RKEY_VIOLATION:
1326 if (qp_type(qp) == IB_QPT_RC) {
1327 /* Class C */
1328 do_class_ac_error(qp, AETH_NAK_REM_ACC_ERR,
1329 IB_WC_REM_ACCESS_ERR);
1330 state = RESPST_COMPLETE;
1331 } else {
1332 qp->resp.drop_msg = 1;
1333 if (qp->srq) {
1334 /* UC/SRQ Class D */
1335 qp->resp.status = IB_WC_REM_ACCESS_ERR;
1336 state = RESPST_COMPLETE;
1337 } else {
1338 /* UC/non-SRQ Class E. */
1339 state = RESPST_CLEANUP;
1340 }
1341 }
1342 break;
1343
1344 case RESPST_ERR_LENGTH:
1345 if (qp_type(qp) == IB_QPT_RC) {
1346 /* Class C */
1347 do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1348 IB_WC_REM_INV_REQ_ERR);
1349 state = RESPST_COMPLETE;
1350 } else if (qp->srq) {
1351 /* UC/UD - class E */
1352 qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1353 state = RESPST_COMPLETE;
1354 } else {
1355 /* UC/UD - class D */
1356 qp->resp.drop_msg = 1;
1357 state = RESPST_CLEANUP;
1358 }
1359 break;
1360
1361 case RESPST_ERR_MALFORMED_WQE:
1362 /* All, Class A. */
1363 do_class_ac_error(qp, AETH_NAK_REM_OP_ERR,
1364 IB_WC_LOC_QP_OP_ERR);
1365 state = RESPST_COMPLETE;
1366 break;
1367
1368 case RESPST_ERR_CQ_OVERFLOW:
1369 /* All - Class G */
1370 state = RESPST_ERROR;
1371 break;
1372
1373 case RESPST_DONE:
1374 if (qp->resp.goto_error) {
1375 state = RESPST_ERROR;
1376 break;
1377 }
1378
1379 goto done;
1380
1381 case RESPST_EXIT:
1382 if (qp->resp.goto_error) {
1383 state = RESPST_ERROR;
1384 break;
1385 }
1386
1387 goto exit;
1388
1389 case RESPST_RESET:
1390 rxe_drain_req_pkts(qp, false);
1391 qp->resp.wqe = NULL;
1392 goto exit;
1393
1394 case RESPST_ERROR:
1395 qp->resp.goto_error = 0;
1396 pr_warn("qp#%d moved to error state\n", qp_num(qp));
1397 rxe_qp_error(qp);
1398 goto exit;
1399
1400 default:
1401 WARN_ON_ONCE(1);
1402 }
1403 }
1404
1405 exit:
1406 ret = -EAGAIN;
1407 done:
1408 rxe_drop_ref(qp);
1409 return ret;
1410 }
Linux with added FPC-III support