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Linux 4.19.133
[linux/fpc-iii.git] / drivers / infiniband / sw / rxe / rxe_resp.c
blob9078cfd3b8bdd99ac14f17170e3a47032af8d45f
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 qp->resp.length = reth_len(pkt);
439 }
440 access = (pkt->mask & RXE_READ_MASK) ? IB_ACCESS_REMOTE_READ
441 : IB_ACCESS_REMOTE_WRITE;
442 } else if (pkt->mask & RXE_ATOMIC_MASK) {
443 qp->resp.va = atmeth_va(pkt);
444 qp->resp.rkey = atmeth_rkey(pkt);
445 qp->resp.resid = sizeof(u64);
446 access = IB_ACCESS_REMOTE_ATOMIC;
447 } else {
448 return RESPST_EXECUTE;
449 }
450
451 /* A zero-byte op is not required to set an addr or rkey. */
452 if ((pkt->mask & (RXE_READ_MASK | RXE_WRITE_OR_SEND)) &&
453 (pkt->mask & RXE_RETH_MASK) &&
454 reth_len(pkt) == 0) {
455 return RESPST_EXECUTE;
456 }
457
458 va = qp->resp.va;
459 rkey = qp->resp.rkey;
460 resid = qp->resp.resid;
461 pktlen = payload_size(pkt);
462
463 mem = lookup_mem(qp->pd, access, rkey, lookup_remote);
464 if (!mem) {
465 state = RESPST_ERR_RKEY_VIOLATION;
466 goto err;
467 }
468
469 if (unlikely(mem->state == RXE_MEM_STATE_FREE)) {
470 state = RESPST_ERR_RKEY_VIOLATION;
471 goto err;
472 }
473
474 if (mem_check_range(mem, va, resid)) {
475 state = RESPST_ERR_RKEY_VIOLATION;
476 goto err;
477 }
478
479 if (pkt->mask & RXE_WRITE_MASK) {
480 if (resid > mtu) {
481 if (pktlen != mtu || bth_pad(pkt)) {
482 state = RESPST_ERR_LENGTH;
483 goto err;
484 }
485 } else {
486 if (pktlen != resid) {
487 state = RESPST_ERR_LENGTH;
488 goto err;
489 }
490 if ((bth_pad(pkt) != (0x3 & (-resid)))) {
491 /* This case may not be exactly that
492 * but nothing else fits.
493 */
494 state = RESPST_ERR_LENGTH;
495 goto err;
496 }
497 }
498 }
499
500 WARN_ON_ONCE(qp->resp.mr);
501
502 qp->resp.mr = mem;
503 return RESPST_EXECUTE;
504
505 err:
506 if (mem)
507 rxe_drop_ref(mem);
508 return state;
509 }
510
511 static enum resp_states send_data_in(struct rxe_qp *qp, void *data_addr,
512 int data_len)
513 {
514 int err;
515
516 err = copy_data(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 res->replay = 0;
687
688 res->read.va = qp->resp.va;
689 res->read.va_org = qp->resp.va;
690
691 res->first_psn = req_pkt->psn;
692
693 if (reth_len(req_pkt)) {
694 res->last_psn = (req_pkt->psn +
695 (reth_len(req_pkt) + mtu - 1) /
696 mtu - 1) & BTH_PSN_MASK;
697 } else {
698 res->last_psn = res->first_psn;
699 }
700 res->cur_psn = req_pkt->psn;
701
702 res->read.resid = qp->resp.resid;
703 res->read.length = qp->resp.resid;
704 res->read.rkey = qp->resp.rkey;
705
706 /* note res inherits the reference to mr from qp */
707 res->read.mr = qp->resp.mr;
708 qp->resp.mr = NULL;
709
710 qp->resp.res = res;
711 res->state = rdatm_res_state_new;
712 }
713
714 if (res->state == rdatm_res_state_new) {
715 if (res->read.resid <= mtu)
716 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_ONLY;
717 else
718 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST;
719 } else {
720 if (res->read.resid > mtu)
721 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE;
722 else
723 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_LAST;
724 }
725
726 res->state = rdatm_res_state_next;
727
728 payload = min_t(int, res->read.resid, mtu);
729
730 skb = prepare_ack_packet(qp, req_pkt, &ack_pkt, opcode, payload,
731 res->cur_psn, AETH_ACK_UNLIMITED, &icrc);
732 if (!skb)
733 return RESPST_ERR_RNR;
734
735 err = rxe_mem_copy(res->read.mr, res->read.va, payload_addr(&ack_pkt),
736 payload, from_mem_obj, &icrc);
737 if (err)
738 pr_err("Failed copying memory\n");
739
740 if (bth_pad(&ack_pkt)) {
741 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
742 u8 *pad = payload_addr(&ack_pkt) + payload;
743
744 memset(pad, 0, bth_pad(&ack_pkt));
745 icrc = rxe_crc32(rxe, icrc, pad, bth_pad(&ack_pkt));
746 }
747 p = payload_addr(&ack_pkt) + payload + bth_pad(&ack_pkt);
748 *p = ~icrc;
749
750 err = rxe_xmit_packet(rxe, qp, &ack_pkt, skb);
751 if (err) {
752 pr_err("Failed sending RDMA reply.\n");
753 return RESPST_ERR_RNR;
754 }
755
756 res->read.va += payload;
757 res->read.resid -= payload;
758 res->cur_psn = (res->cur_psn + 1) & BTH_PSN_MASK;
759
760 if (res->read.resid > 0) {
761 state = RESPST_DONE;
762 } else {
763 qp->resp.res = NULL;
764 if (!res->replay)
765 qp->resp.opcode = -1;
766 if (psn_compare(res->cur_psn, qp->resp.psn) >= 0)
767 qp->resp.psn = res->cur_psn;
768 state = RESPST_CLEANUP;
769 }
770
771 return state;
772 }
773
774 static void build_rdma_network_hdr(union rdma_network_hdr *hdr,
775 struct rxe_pkt_info *pkt)
776 {
777 struct sk_buff *skb = PKT_TO_SKB(pkt);
778
779 memset(hdr, 0, sizeof(*hdr));
780 if (skb->protocol == htons(ETH_P_IP))
781 memcpy(&hdr->roce4grh, ip_hdr(skb), sizeof(hdr->roce4grh));
782 else if (skb->protocol == htons(ETH_P_IPV6))
783 memcpy(&hdr->ibgrh, ipv6_hdr(skb), sizeof(hdr->ibgrh));
784 }
785
786 /* Executes a new request. A retried request never reach that function (send
787 * and writes are discarded, and reads and atomics are retried elsewhere.
788 */
789 static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt)
790 {
791 enum resp_states err;
792
793 if (pkt->mask & RXE_SEND_MASK) {
794 if (qp_type(qp) == IB_QPT_UD ||
795 qp_type(qp) == IB_QPT_SMI ||
796 qp_type(qp) == IB_QPT_GSI) {
797 union rdma_network_hdr hdr;
798
799 build_rdma_network_hdr(&hdr, pkt);
800
801 err = send_data_in(qp, &hdr, sizeof(hdr));
802 if (err)
803 return err;
804 }
805 err = send_data_in(qp, payload_addr(pkt), payload_size(pkt));
806 if (err)
807 return err;
808 } else if (pkt->mask & RXE_WRITE_MASK) {
809 err = write_data_in(qp, pkt);
810 if (err)
811 return err;
812 } else if (pkt->mask & RXE_READ_MASK) {
813 /* For RDMA Read we can increment the msn now. See C9-148. */
814 qp->resp.msn++;
815 return RESPST_READ_REPLY;
816 } else if (pkt->mask & RXE_ATOMIC_MASK) {
817 err = process_atomic(qp, pkt);
818 if (err)
819 return err;
820 } else {
821 /* Unreachable */
822 WARN_ON_ONCE(1);
823 }
824
825 /* next expected psn, read handles this separately */
826 qp->resp.psn = (pkt->psn + 1) & BTH_PSN_MASK;
827 qp->resp.ack_psn = qp->resp.psn;
828
829 qp->resp.opcode = pkt->opcode;
830 qp->resp.status = IB_WC_SUCCESS;
831
832 if (pkt->mask & RXE_COMP_MASK) {
833 /* We successfully processed this new request. */
834 qp->resp.msn++;
835 return RESPST_COMPLETE;
836 } else if (qp_type(qp) == IB_QPT_RC)
837 return RESPST_ACKNOWLEDGE;
838 else
839 return RESPST_CLEANUP;
840 }
841
842 static enum resp_states do_complete(struct rxe_qp *qp,
843 struct rxe_pkt_info *pkt)
844 {
845 struct rxe_cqe cqe;
846 struct ib_wc *wc = &cqe.ibwc;
847 struct ib_uverbs_wc *uwc = &cqe.uibwc;
848 struct rxe_recv_wqe *wqe = qp->resp.wqe;
849
850 if (unlikely(!wqe))
851 return RESPST_CLEANUP;
852
853 memset(&cqe, 0, sizeof(cqe));
854
855 if (qp->rcq->is_user) {
856 uwc->status = qp->resp.status;
857 uwc->qp_num = qp->ibqp.qp_num;
858 uwc->wr_id = wqe->wr_id;
859 } else {
860 wc->status = qp->resp.status;
861 wc->qp = &qp->ibqp;
862 wc->wr_id = wqe->wr_id;
863 }
864
865 if (wc->status == IB_WC_SUCCESS) {
866 wc->opcode = (pkt->mask & RXE_IMMDT_MASK &&
867 pkt->mask & RXE_WRITE_MASK) ?
868 IB_WC_RECV_RDMA_WITH_IMM : IB_WC_RECV;
869 wc->vendor_err = 0;
870 wc->byte_len = (pkt->mask & RXE_IMMDT_MASK &&
871 pkt->mask & RXE_WRITE_MASK) ?
872 qp->resp.length : wqe->dma.length - wqe->dma.resid;
873
874 /* fields after byte_len are different between kernel and user
875 * space
876 */
877 if (qp->rcq->is_user) {
878 uwc->wc_flags = IB_WC_GRH;
879
880 if (pkt->mask & RXE_IMMDT_MASK) {
881 uwc->wc_flags |= IB_WC_WITH_IMM;
882 uwc->ex.imm_data = immdt_imm(pkt);
883 }
884
885 if (pkt->mask & RXE_IETH_MASK) {
886 uwc->wc_flags |= IB_WC_WITH_INVALIDATE;
887 uwc->ex.invalidate_rkey = ieth_rkey(pkt);
888 }
889
890 uwc->qp_num = qp->ibqp.qp_num;
891
892 if (pkt->mask & RXE_DETH_MASK)
893 uwc->src_qp = deth_sqp(pkt);
894
895 uwc->port_num = qp->attr.port_num;
896 } else {
897 struct sk_buff *skb = PKT_TO_SKB(pkt);
898
899 wc->wc_flags = IB_WC_GRH | IB_WC_WITH_NETWORK_HDR_TYPE;
900 if (skb->protocol == htons(ETH_P_IP))
901 wc->network_hdr_type = RDMA_NETWORK_IPV4;
902 else
903 wc->network_hdr_type = RDMA_NETWORK_IPV6;
904
905 if (is_vlan_dev(skb->dev)) {
906 wc->wc_flags |= IB_WC_WITH_VLAN;
907 wc->vlan_id = vlan_dev_vlan_id(skb->dev);
908 }
909
910 if (pkt->mask & RXE_IMMDT_MASK) {
911 wc->wc_flags |= IB_WC_WITH_IMM;
912 wc->ex.imm_data = immdt_imm(pkt);
913 }
914
915 if (pkt->mask & RXE_IETH_MASK) {
916 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
917 struct rxe_mem *rmr;
918
919 wc->wc_flags |= IB_WC_WITH_INVALIDATE;
920 wc->ex.invalidate_rkey = ieth_rkey(pkt);
921
922 rmr = rxe_pool_get_index(&rxe->mr_pool,
923 wc->ex.invalidate_rkey >> 8);
924 if (unlikely(!rmr)) {
925 pr_err("Bad rkey %#x invalidation\n",
926 wc->ex.invalidate_rkey);
927 return RESPST_ERROR;
928 }
929 rmr->state = RXE_MEM_STATE_FREE;
930 rxe_drop_ref(rmr);
931 }
932
933 wc->qp = &qp->ibqp;
934
935 if (pkt->mask & RXE_DETH_MASK)
936 wc->src_qp = deth_sqp(pkt);
937
938 wc->port_num = qp->attr.port_num;
939 }
940 }
941
942 /* have copy for srq and reference for !srq */
943 if (!qp->srq)
944 advance_consumer(qp->rq.queue);
945
946 qp->resp.wqe = NULL;
947
948 if (rxe_cq_post(qp->rcq, &cqe, pkt ? bth_se(pkt) : 1))
949 return RESPST_ERR_CQ_OVERFLOW;
950
951 if (qp->resp.state == QP_STATE_ERROR)
952 return RESPST_CHK_RESOURCE;
953
954 if (!pkt)
955 return RESPST_DONE;
956 else if (qp_type(qp) == IB_QPT_RC)
957 return RESPST_ACKNOWLEDGE;
958 else
959 return RESPST_CLEANUP;
960 }
961
962 static int send_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
963 u8 syndrome, u32 psn)
964 {
965 int err = 0;
966 struct rxe_pkt_info ack_pkt;
967 struct sk_buff *skb;
968 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
969
970 skb = prepare_ack_packet(qp, pkt, &ack_pkt, IB_OPCODE_RC_ACKNOWLEDGE,
971 0, psn, syndrome, NULL);
972 if (!skb) {
973 err = -ENOMEM;
974 goto err1;
975 }
976
977 err = rxe_xmit_packet(rxe, qp, &ack_pkt, skb);
978 if (err)
979 pr_err_ratelimited("Failed sending ack\n");
980
981 err1:
982 return err;
983 }
984
985 static int send_atomic_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
986 u8 syndrome)
987 {
988 int rc = 0;
989 struct rxe_pkt_info ack_pkt;
990 struct sk_buff *skb;
991 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
992 struct resp_res *res;
993
994 skb = prepare_ack_packet(qp, pkt, &ack_pkt,
995 IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE, 0, pkt->psn,
996 syndrome, NULL);
997 if (!skb) {
998 rc = -ENOMEM;
999 goto out;
1000 }
1001
1002 rxe_add_ref(qp);
1003
1004 res = &qp->resp.resources[qp->resp.res_head];
1005 free_rd_atomic_resource(qp, res);
1006 rxe_advance_resp_resource(qp);
1007
1008 memcpy(SKB_TO_PKT(skb), &ack_pkt, sizeof(ack_pkt));
1009 memset((unsigned char *)SKB_TO_PKT(skb) + sizeof(ack_pkt), 0,
1010 sizeof(skb->cb) - sizeof(ack_pkt));
1011
1012 skb_get(skb);
1013 res->type = RXE_ATOMIC_MASK;
1014 res->atomic.skb = skb;
1015 res->first_psn = ack_pkt.psn;
1016 res->last_psn = ack_pkt.psn;
1017 res->cur_psn = ack_pkt.psn;
1018
1019 rc = rxe_xmit_packet(rxe, qp, &ack_pkt, skb);
1020 if (rc) {
1021 pr_err_ratelimited("Failed sending ack\n");
1022 rxe_drop_ref(qp);
1023 }
1024 out:
1025 return rc;
1026 }
1027
1028 static enum resp_states acknowledge(struct rxe_qp *qp,
1029 struct rxe_pkt_info *pkt)
1030 {
1031 if (qp_type(qp) != IB_QPT_RC)
1032 return RESPST_CLEANUP;
1033
1034 if (qp->resp.aeth_syndrome != AETH_ACK_UNLIMITED)
1035 send_ack(qp, pkt, qp->resp.aeth_syndrome, pkt->psn);
1036 else if (pkt->mask & RXE_ATOMIC_MASK)
1037 send_atomic_ack(qp, pkt, AETH_ACK_UNLIMITED);
1038 else if (bth_ack(pkt))
1039 send_ack(qp, pkt, AETH_ACK_UNLIMITED, pkt->psn);
1040
1041 return RESPST_CLEANUP;
1042 }
1043
1044 static enum resp_states cleanup(struct rxe_qp *qp,
1045 struct rxe_pkt_info *pkt)
1046 {
1047 struct sk_buff *skb;
1048
1049 if (pkt) {
1050 skb = skb_dequeue(&qp->req_pkts);
1051 rxe_drop_ref(qp);
1052 kfree_skb(skb);
1053 }
1054
1055 if (qp->resp.mr) {
1056 rxe_drop_ref(qp->resp.mr);
1057 qp->resp.mr = NULL;
1058 }
1059
1060 return RESPST_DONE;
1061 }
1062
1063 static struct resp_res *find_resource(struct rxe_qp *qp, u32 psn)
1064 {
1065 int i;
1066
1067 for (i = 0; i < qp->attr.max_dest_rd_atomic; i++) {
1068 struct resp_res *res = &qp->resp.resources[i];
1069
1070 if (res->type == 0)
1071 continue;
1072
1073 if (psn_compare(psn, res->first_psn) >= 0 &&
1074 psn_compare(psn, res->last_psn) <= 0) {
1075 return res;
1076 }
1077 }
1078
1079 return NULL;
1080 }
1081
1082 static enum resp_states duplicate_request(struct rxe_qp *qp,
1083 struct rxe_pkt_info *pkt)
1084 {
1085 enum resp_states rc;
1086 u32 prev_psn = (qp->resp.ack_psn - 1) & BTH_PSN_MASK;
1087
1088 if (pkt->mask & RXE_SEND_MASK ||
1089 pkt->mask & RXE_WRITE_MASK) {
1090 /* SEND. Ack again and cleanup. C9-105. */
1091 if (bth_ack(pkt))
1092 send_ack(qp, pkt, AETH_ACK_UNLIMITED, prev_psn);
1093 rc = RESPST_CLEANUP;
1094 goto out;
1095 } else if (pkt->mask & RXE_READ_MASK) {
1096 struct resp_res *res;
1097
1098 res = find_resource(qp, pkt->psn);
1099 if (!res) {
1100 /* Resource not found. Class D error. Drop the
1101 * request.
1102 */
1103 rc = RESPST_CLEANUP;
1104 goto out;
1105 } else {
1106 /* Ensure this new request is the same as the previous
1107 * one or a subset of it.
1108 */
1109 u64 iova = reth_va(pkt);
1110 u32 resid = reth_len(pkt);
1111
1112 if (iova < res->read.va_org ||
1113 resid > res->read.length ||
1114 (iova + resid) > (res->read.va_org +
1115 res->read.length)) {
1116 rc = RESPST_CLEANUP;
1117 goto out;
1118 }
1119
1120 if (reth_rkey(pkt) != res->read.rkey) {
1121 rc = RESPST_CLEANUP;
1122 goto out;
1123 }
1124
1125 res->cur_psn = pkt->psn;
1126 res->state = (pkt->psn == res->first_psn) ?
1127 rdatm_res_state_new :
1128 rdatm_res_state_replay;
1129 res->replay = 1;
1130
1131 /* Reset the resource, except length. */
1132 res->read.va_org = iova;
1133 res->read.va = iova;
1134 res->read.resid = resid;
1135
1136 /* Replay the RDMA read reply. */
1137 qp->resp.res = res;
1138 rc = RESPST_READ_REPLY;
1139 goto out;
1140 }
1141 } else {
1142 struct resp_res *res;
1143
1144 /* Find the operation in our list of responder resources. */
1145 res = find_resource(qp, pkt->psn);
1146 if (res) {
1147 skb_get(res->atomic.skb);
1148 /* Resend the result. */
1149 rc = rxe_xmit_packet(to_rdev(qp->ibqp.device), qp,
1150 pkt, res->atomic.skb);
1151 if (rc) {
1152 pr_err("Failed resending result. This flow is not handled - skb ignored\n");
1153 rc = RESPST_CLEANUP;
1154 goto out;
1155 }
1156 }
1157
1158 /* Resource not found. Class D error. Drop the request. */
1159 rc = RESPST_CLEANUP;
1160 goto out;
1161 }
1162 out:
1163 return rc;
1164 }
1165
1166 /* Process a class A or C. Both are treated the same in this implementation. */
1167 static void do_class_ac_error(struct rxe_qp *qp, u8 syndrome,
1168 enum ib_wc_status status)
1169 {
1170 qp->resp.aeth_syndrome = syndrome;
1171 qp->resp.status = status;
1172
1173 /* indicate that we should go through the ERROR state */
1174 qp->resp.goto_error = 1;
1175 }
1176
1177 static enum resp_states do_class_d1e_error(struct rxe_qp *qp)
1178 {
1179 /* UC */
1180 if (qp->srq) {
1181 /* Class E */
1182 qp->resp.drop_msg = 1;
1183 if (qp->resp.wqe) {
1184 qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1185 return RESPST_COMPLETE;
1186 } else {
1187 return RESPST_CLEANUP;
1188 }
1189 } else {
1190 /* Class D1. This packet may be the start of a
1191 * new message and could be valid. The previous
1192 * message is invalid and ignored. reset the
1193 * recv wr to its original state
1194 */
1195 if (qp->resp.wqe) {
1196 qp->resp.wqe->dma.resid = qp->resp.wqe->dma.length;
1197 qp->resp.wqe->dma.cur_sge = 0;
1198 qp->resp.wqe->dma.sge_offset = 0;
1199 qp->resp.opcode = -1;
1200 }
1201
1202 if (qp->resp.mr) {
1203 rxe_drop_ref(qp->resp.mr);
1204 qp->resp.mr = NULL;
1205 }
1206
1207 return RESPST_CLEANUP;
1208 }
1209 }
1210
1211 static void rxe_drain_req_pkts(struct rxe_qp *qp, bool notify)
1212 {
1213 struct sk_buff *skb;
1214
1215 while ((skb = skb_dequeue(&qp->req_pkts))) {
1216 rxe_drop_ref(qp);
1217 kfree_skb(skb);
1218 }
1219
1220 if (notify)
1221 return;
1222
1223 while (!qp->srq && qp->rq.queue && queue_head(qp->rq.queue))
1224 advance_consumer(qp->rq.queue);
1225 }
1226
1227 int rxe_responder(void *arg)
1228 {
1229 struct rxe_qp *qp = (struct rxe_qp *)arg;
1230 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
1231 enum resp_states state;
1232 struct rxe_pkt_info *pkt = NULL;
1233 int ret = 0;
1234
1235 rxe_add_ref(qp);
1236
1237 qp->resp.aeth_syndrome = AETH_ACK_UNLIMITED;
1238
1239 if (!qp->valid) {
1240 ret = -EINVAL;
1241 goto done;
1242 }
1243
1244 switch (qp->resp.state) {
1245 case QP_STATE_RESET:
1246 state = RESPST_RESET;
1247 break;
1248
1249 default:
1250 state = RESPST_GET_REQ;
1251 break;
1252 }
1253
1254 while (1) {
1255 pr_debug("qp#%d state = %s\n", qp_num(qp),
1256 resp_state_name[state]);
1257 switch (state) {
1258 case RESPST_GET_REQ:
1259 state = get_req(qp, &pkt);
1260 break;
1261 case RESPST_CHK_PSN:
1262 state = check_psn(qp, pkt);
1263 break;
1264 case RESPST_CHK_OP_SEQ:
1265 state = check_op_seq(qp, pkt);
1266 break;
1267 case RESPST_CHK_OP_VALID:
1268 state = check_op_valid(qp, pkt);
1269 break;
1270 case RESPST_CHK_RESOURCE:
1271 state = check_resource(qp, pkt);
1272 break;
1273 case RESPST_CHK_LENGTH:
1274 state = check_length(qp, pkt);
1275 break;
1276 case RESPST_CHK_RKEY:
1277 state = check_rkey(qp, pkt);
1278 break;
1279 case RESPST_EXECUTE:
1280 state = execute(qp, pkt);
1281 break;
1282 case RESPST_COMPLETE:
1283 state = do_complete(qp, pkt);
1284 break;
1285 case RESPST_READ_REPLY:
1286 state = read_reply(qp, pkt);
1287 break;
1288 case RESPST_ACKNOWLEDGE:
1289 state = acknowledge(qp, pkt);
1290 break;
1291 case RESPST_CLEANUP:
1292 state = cleanup(qp, pkt);
1293 break;
1294 case RESPST_DUPLICATE_REQUEST:
1295 state = duplicate_request(qp, pkt);
1296 break;
1297 case RESPST_ERR_PSN_OUT_OF_SEQ:
1298 /* RC only - Class B. Drop packet. */
1299 send_ack(qp, pkt, AETH_NAK_PSN_SEQ_ERROR, qp->resp.psn);
1300 state = RESPST_CLEANUP;
1301 break;
1302
1303 case RESPST_ERR_TOO_MANY_RDMA_ATM_REQ:
1304 case RESPST_ERR_MISSING_OPCODE_FIRST:
1305 case RESPST_ERR_MISSING_OPCODE_LAST_C:
1306 case RESPST_ERR_UNSUPPORTED_OPCODE:
1307 case RESPST_ERR_MISALIGNED_ATOMIC:
1308 /* RC Only - Class C. */
1309 do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1310 IB_WC_REM_INV_REQ_ERR);
1311 state = RESPST_COMPLETE;
1312 break;
1313
1314 case RESPST_ERR_MISSING_OPCODE_LAST_D1E:
1315 state = do_class_d1e_error(qp);
1316 break;
1317 case RESPST_ERR_RNR:
1318 if (qp_type(qp) == IB_QPT_RC) {
1319 rxe_counter_inc(rxe, RXE_CNT_SND_RNR);
1320 /* RC - class B */
1321 send_ack(qp, pkt, AETH_RNR_NAK |
1322 (~AETH_TYPE_MASK &
1323 qp->attr.min_rnr_timer),
1324 pkt->psn);
1325 } else {
1326 /* UD/UC - class D */
1327 qp->resp.drop_msg = 1;
1328 }
1329 state = RESPST_CLEANUP;
1330 break;
1331
1332 case RESPST_ERR_RKEY_VIOLATION:
1333 if (qp_type(qp) == IB_QPT_RC) {
1334 /* Class C */
1335 do_class_ac_error(qp, AETH_NAK_REM_ACC_ERR,
1336 IB_WC_REM_ACCESS_ERR);
1337 state = RESPST_COMPLETE;
1338 } else {
1339 qp->resp.drop_msg = 1;
1340 if (qp->srq) {
1341 /* UC/SRQ Class D */
1342 qp->resp.status = IB_WC_REM_ACCESS_ERR;
1343 state = RESPST_COMPLETE;
1344 } else {
1345 /* UC/non-SRQ Class E. */
1346 state = RESPST_CLEANUP;
1347 }
1348 }
1349 break;
1350
1351 case RESPST_ERR_LENGTH:
1352 if (qp_type(qp) == IB_QPT_RC) {
1353 /* Class C */
1354 do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1355 IB_WC_REM_INV_REQ_ERR);
1356 state = RESPST_COMPLETE;
1357 } else if (qp->srq) {
1358 /* UC/UD - class E */
1359 qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1360 state = RESPST_COMPLETE;
1361 } else {
1362 /* UC/UD - class D */
1363 qp->resp.drop_msg = 1;
1364 state = RESPST_CLEANUP;
1365 }
1366 break;
1367
1368 case RESPST_ERR_MALFORMED_WQE:
1369 /* All, Class A. */
1370 do_class_ac_error(qp, AETH_NAK_REM_OP_ERR,
1371 IB_WC_LOC_QP_OP_ERR);
1372 state = RESPST_COMPLETE;
1373 break;
1374
1375 case RESPST_ERR_CQ_OVERFLOW:
1376 /* All - Class G */
1377 state = RESPST_ERROR;
1378 break;
1379
1380 case RESPST_DONE:
1381 if (qp->resp.goto_error) {
1382 state = RESPST_ERROR;
1383 break;
1384 }
1385
1386 goto done;
1387
1388 case RESPST_EXIT:
1389 if (qp->resp.goto_error) {
1390 state = RESPST_ERROR;
1391 break;
1392 }
1393
1394 goto exit;
1395
1396 case RESPST_RESET:
1397 rxe_drain_req_pkts(qp, false);
1398 qp->resp.wqe = NULL;
1399 goto exit;
1400
1401 case RESPST_ERROR:
1402 qp->resp.goto_error = 0;
1403 pr_warn("qp#%d moved to error state\n", qp_num(qp));
1404 rxe_qp_error(qp);
1405 goto exit;
1406
1407 default:
1408 WARN_ON_ONCE(1);
1409 }
1410 }
1411
1412 exit:
1413 ret = -EAGAIN;
1414 done:
1415 rxe_drop_ref(qp);
1416 return ret;
1417 }
Linux with added FPC-III support