blob: ccf62476356515feeba0aa8051a8cb7398ccea22 [file] [log] [blame]
Moni Shoua8700e3e2016-06-16 16:45:23 +03001/*
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
40enum 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
73static 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 */
107void 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
121static 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
148static 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
153 switch (qp_type(qp)) {
154 case IB_QPT_RC:
155 if (diff > 0) {
156 if (qp->resp.sent_psn_nak)
157 return RESPST_CLEANUP;
158
159 qp->resp.sent_psn_nak = 1;
160 return RESPST_ERR_PSN_OUT_OF_SEQ;
161
162 } else if (diff < 0) {
163 return RESPST_DUPLICATE_REQUEST;
164 }
165
166 if (qp->resp.sent_psn_nak)
167 qp->resp.sent_psn_nak = 0;
168
169 break;
170
171 case IB_QPT_UC:
172 if (qp->resp.drop_msg || diff != 0) {
173 if (pkt->mask & RXE_START_MASK) {
174 qp->resp.drop_msg = 0;
175 return RESPST_CHK_OP_SEQ;
176 }
177
178 qp->resp.drop_msg = 1;
179 return RESPST_CLEANUP;
180 }
181 break;
182 default:
183 break;
184 }
185
186 return RESPST_CHK_OP_SEQ;
187}
188
189static enum resp_states check_op_seq(struct rxe_qp *qp,
190 struct rxe_pkt_info *pkt)
191{
192 switch (qp_type(qp)) {
193 case IB_QPT_RC:
194 switch (qp->resp.opcode) {
195 case IB_OPCODE_RC_SEND_FIRST:
196 case IB_OPCODE_RC_SEND_MIDDLE:
197 switch (pkt->opcode) {
198 case IB_OPCODE_RC_SEND_MIDDLE:
199 case IB_OPCODE_RC_SEND_LAST:
200 case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE:
201 case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE:
202 return RESPST_CHK_OP_VALID;
203 default:
204 return RESPST_ERR_MISSING_OPCODE_LAST_C;
205 }
206
207 case IB_OPCODE_RC_RDMA_WRITE_FIRST:
208 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
209 switch (pkt->opcode) {
210 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
211 case IB_OPCODE_RC_RDMA_WRITE_LAST:
212 case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
213 return RESPST_CHK_OP_VALID;
214 default:
215 return RESPST_ERR_MISSING_OPCODE_LAST_C;
216 }
217
218 default:
219 switch (pkt->opcode) {
220 case IB_OPCODE_RC_SEND_MIDDLE:
221 case IB_OPCODE_RC_SEND_LAST:
222 case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE:
223 case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE:
224 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
225 case IB_OPCODE_RC_RDMA_WRITE_LAST:
226 case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
227 return RESPST_ERR_MISSING_OPCODE_FIRST;
228 default:
229 return RESPST_CHK_OP_VALID;
230 }
231 }
232 break;
233
234 case IB_QPT_UC:
235 switch (qp->resp.opcode) {
236 case IB_OPCODE_UC_SEND_FIRST:
237 case IB_OPCODE_UC_SEND_MIDDLE:
238 switch (pkt->opcode) {
239 case IB_OPCODE_UC_SEND_MIDDLE:
240 case IB_OPCODE_UC_SEND_LAST:
241 case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE:
242 return RESPST_CHK_OP_VALID;
243 default:
244 return RESPST_ERR_MISSING_OPCODE_LAST_D1E;
245 }
246
247 case IB_OPCODE_UC_RDMA_WRITE_FIRST:
248 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
249 switch (pkt->opcode) {
250 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
251 case IB_OPCODE_UC_RDMA_WRITE_LAST:
252 case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
253 return RESPST_CHK_OP_VALID;
254 default:
255 return RESPST_ERR_MISSING_OPCODE_LAST_D1E;
256 }
257
258 default:
259 switch (pkt->opcode) {
260 case IB_OPCODE_UC_SEND_MIDDLE:
261 case IB_OPCODE_UC_SEND_LAST:
262 case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE:
263 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
264 case IB_OPCODE_UC_RDMA_WRITE_LAST:
265 case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
266 qp->resp.drop_msg = 1;
267 return RESPST_CLEANUP;
268 default:
269 return RESPST_CHK_OP_VALID;
270 }
271 }
272 break;
273
274 default:
275 return RESPST_CHK_OP_VALID;
276 }
277}
278
279static enum resp_states check_op_valid(struct rxe_qp *qp,
280 struct rxe_pkt_info *pkt)
281{
282 switch (qp_type(qp)) {
283 case IB_QPT_RC:
284 if (((pkt->mask & RXE_READ_MASK) &&
285 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_READ)) ||
286 ((pkt->mask & RXE_WRITE_MASK) &&
287 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) ||
288 ((pkt->mask & RXE_ATOMIC_MASK) &&
289 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) {
290 return RESPST_ERR_UNSUPPORTED_OPCODE;
291 }
292
293 break;
294
295 case IB_QPT_UC:
296 if ((pkt->mask & RXE_WRITE_MASK) &&
297 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) {
298 qp->resp.drop_msg = 1;
299 return RESPST_CLEANUP;
300 }
301
302 break;
303
304 case IB_QPT_UD:
305 case IB_QPT_SMI:
306 case IB_QPT_GSI:
307 break;
308
309 default:
310 WARN_ON(1);
311 break;
312 }
313
314 return RESPST_CHK_RESOURCE;
315}
316
317static enum resp_states get_srq_wqe(struct rxe_qp *qp)
318{
319 struct rxe_srq *srq = qp->srq;
320 struct rxe_queue *q = srq->rq.queue;
321 struct rxe_recv_wqe *wqe;
322 struct ib_event ev;
323
324 if (srq->error)
325 return RESPST_ERR_RNR;
326
327 spin_lock_bh(&srq->rq.consumer_lock);
328
329 wqe = queue_head(q);
330 if (!wqe) {
331 spin_unlock_bh(&srq->rq.consumer_lock);
332 return RESPST_ERR_RNR;
333 }
334
335 /* note kernel and user space recv wqes have same size */
336 memcpy(&qp->resp.srq_wqe, wqe, sizeof(qp->resp.srq_wqe));
337
338 qp->resp.wqe = &qp->resp.srq_wqe.wqe;
339 advance_consumer(q);
340
341 if (srq->limit && srq->ibsrq.event_handler &&
342 (queue_count(q) < srq->limit)) {
343 srq->limit = 0;
344 goto event;
345 }
346
347 spin_unlock_bh(&srq->rq.consumer_lock);
348 return RESPST_CHK_LENGTH;
349
350event:
351 spin_unlock_bh(&srq->rq.consumer_lock);
352 ev.device = qp->ibqp.device;
353 ev.element.srq = qp->ibqp.srq;
354 ev.event = IB_EVENT_SRQ_LIMIT_REACHED;
355 srq->ibsrq.event_handler(&ev, srq->ibsrq.srq_context);
356 return RESPST_CHK_LENGTH;
357}
358
359static enum resp_states check_resource(struct rxe_qp *qp,
360 struct rxe_pkt_info *pkt)
361{
362 struct rxe_srq *srq = qp->srq;
363
364 if (qp->resp.state == QP_STATE_ERROR) {
365 if (qp->resp.wqe) {
366 qp->resp.status = IB_WC_WR_FLUSH_ERR;
367 return RESPST_COMPLETE;
368 } else if (!srq) {
369 qp->resp.wqe = queue_head(qp->rq.queue);
370 if (qp->resp.wqe) {
371 qp->resp.status = IB_WC_WR_FLUSH_ERR;
372 return RESPST_COMPLETE;
373 } else {
374 return RESPST_EXIT;
375 }
376 } else {
377 return RESPST_EXIT;
378 }
379 }
380
381 if (pkt->mask & RXE_READ_OR_ATOMIC) {
382 /* it is the requesters job to not send
383 * too many read/atomic ops, we just
384 * recycle the responder resource queue
385 */
Parav Panditb6bbee02016-09-28 20:26:44 +0000386 if (likely(qp->attr.max_dest_rd_atomic > 0))
Moni Shoua8700e3e2016-06-16 16:45:23 +0300387 return RESPST_CHK_LENGTH;
388 else
389 return RESPST_ERR_TOO_MANY_RDMA_ATM_REQ;
390 }
391
392 if (pkt->mask & RXE_RWR_MASK) {
393 if (srq)
394 return get_srq_wqe(qp);
395
396 qp->resp.wqe = queue_head(qp->rq.queue);
397 return (qp->resp.wqe) ? RESPST_CHK_LENGTH : RESPST_ERR_RNR;
398 }
399
400 return RESPST_CHK_LENGTH;
401}
402
403static enum resp_states check_length(struct rxe_qp *qp,
404 struct rxe_pkt_info *pkt)
405{
406 switch (qp_type(qp)) {
407 case IB_QPT_RC:
408 return RESPST_CHK_RKEY;
409
410 case IB_QPT_UC:
411 return RESPST_CHK_RKEY;
412
413 default:
414 return RESPST_CHK_RKEY;
415 }
416}
417
418static enum resp_states check_rkey(struct rxe_qp *qp,
419 struct rxe_pkt_info *pkt)
420{
421 struct rxe_mem *mem;
422 u64 va;
423 u32 rkey;
424 u32 resid;
425 u32 pktlen;
426 int mtu = qp->mtu;
427 enum resp_states state;
428 int access;
429
430 if (pkt->mask & (RXE_READ_MASK | RXE_WRITE_MASK)) {
431 if (pkt->mask & RXE_RETH_MASK) {
432 qp->resp.va = reth_va(pkt);
433 qp->resp.rkey = reth_rkey(pkt);
434 qp->resp.resid = reth_len(pkt);
435 }
436 access = (pkt->mask & RXE_READ_MASK) ? IB_ACCESS_REMOTE_READ
437 : IB_ACCESS_REMOTE_WRITE;
438 } else if (pkt->mask & RXE_ATOMIC_MASK) {
439 qp->resp.va = atmeth_va(pkt);
440 qp->resp.rkey = atmeth_rkey(pkt);
441 qp->resp.resid = sizeof(u64);
442 access = IB_ACCESS_REMOTE_ATOMIC;
443 } else {
444 return RESPST_EXECUTE;
445 }
446
447 va = qp->resp.va;
448 rkey = qp->resp.rkey;
449 resid = qp->resp.resid;
450 pktlen = payload_size(pkt);
451
452 mem = lookup_mem(qp->pd, access, rkey, lookup_remote);
453 if (!mem) {
454 state = RESPST_ERR_RKEY_VIOLATION;
455 goto err1;
456 }
457
458 if (unlikely(mem->state == RXE_MEM_STATE_FREE)) {
459 state = RESPST_ERR_RKEY_VIOLATION;
460 goto err1;
461 }
462
463 if (mem_check_range(mem, va, resid)) {
464 state = RESPST_ERR_RKEY_VIOLATION;
465 goto err2;
466 }
467
468 if (pkt->mask & RXE_WRITE_MASK) {
469 if (resid > mtu) {
470 if (pktlen != mtu || bth_pad(pkt)) {
471 state = RESPST_ERR_LENGTH;
472 goto err2;
473 }
474
Eyal Itkin5476efe2017-02-07 16:43:05 +0300475 qp->resp.resid = mtu;
Moni Shoua8700e3e2016-06-16 16:45:23 +0300476 } else {
477 if (pktlen != resid) {
478 state = RESPST_ERR_LENGTH;
479 goto err2;
480 }
481 if ((bth_pad(pkt) != (0x3 & (-resid)))) {
482 /* This case may not be exactly that
483 * but nothing else fits.
484 */
485 state = RESPST_ERR_LENGTH;
486 goto err2;
487 }
488 }
489 }
490
491 WARN_ON(qp->resp.mr);
492
493 qp->resp.mr = mem;
494 return RESPST_EXECUTE;
495
496err2:
497 rxe_drop_ref(mem);
498err1:
499 return state;
500}
501
502static enum resp_states send_data_in(struct rxe_qp *qp, void *data_addr,
503 int data_len)
504{
505 int err;
506 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
507
508 err = copy_data(rxe, qp->pd, IB_ACCESS_LOCAL_WRITE, &qp->resp.wqe->dma,
509 data_addr, data_len, to_mem_obj, NULL);
510 if (unlikely(err))
511 return (err == -ENOSPC) ? RESPST_ERR_LENGTH
512 : RESPST_ERR_MALFORMED_WQE;
513
514 return RESPST_NONE;
515}
516
517static enum resp_states write_data_in(struct rxe_qp *qp,
518 struct rxe_pkt_info *pkt)
519{
520 enum resp_states rc = RESPST_NONE;
521 int err;
522 int data_len = payload_size(pkt);
523
524 err = rxe_mem_copy(qp->resp.mr, qp->resp.va, payload_addr(pkt),
525 data_len, to_mem_obj, NULL);
526 if (err) {
527 rc = RESPST_ERR_RKEY_VIOLATION;
528 goto out;
529 }
530
531 qp->resp.va += data_len;
532 qp->resp.resid -= data_len;
533
534out:
535 return rc;
536}
537
538/* Guarantee atomicity of atomic operations at the machine level. */
539static DEFINE_SPINLOCK(atomic_ops_lock);
540
541static enum resp_states process_atomic(struct rxe_qp *qp,
542 struct rxe_pkt_info *pkt)
543{
544 u64 iova = atmeth_va(pkt);
545 u64 *vaddr;
546 enum resp_states ret;
547 struct rxe_mem *mr = qp->resp.mr;
548
549 if (mr->state != RXE_MEM_STATE_VALID) {
550 ret = RESPST_ERR_RKEY_VIOLATION;
551 goto out;
552 }
553
554 vaddr = iova_to_vaddr(mr, iova, sizeof(u64));
555
556 /* check vaddr is 8 bytes aligned. */
557 if (!vaddr || (uintptr_t)vaddr & 7) {
558 ret = RESPST_ERR_MISALIGNED_ATOMIC;
559 goto out;
560 }
561
562 spin_lock_bh(&atomic_ops_lock);
563
564 qp->resp.atomic_orig = *vaddr;
565
566 if (pkt->opcode == IB_OPCODE_RC_COMPARE_SWAP ||
567 pkt->opcode == IB_OPCODE_RD_COMPARE_SWAP) {
568 if (*vaddr == atmeth_comp(pkt))
569 *vaddr = atmeth_swap_add(pkt);
570 } else {
571 *vaddr += atmeth_swap_add(pkt);
572 }
573
574 spin_unlock_bh(&atomic_ops_lock);
575
576 ret = RESPST_NONE;
577out:
578 return ret;
579}
580
581static struct sk_buff *prepare_ack_packet(struct rxe_qp *qp,
582 struct rxe_pkt_info *pkt,
583 struct rxe_pkt_info *ack,
584 int opcode,
585 int payload,
586 u32 psn,
587 u8 syndrome,
588 u32 *crcp)
589{
590 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
591 struct sk_buff *skb;
592 u32 crc = 0;
593 u32 *p;
594 int paylen;
595 int pad;
596 int err;
597
598 /*
599 * allocate packet
600 */
601 pad = (-payload) & 0x3;
602 paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE;
603
604 skb = rxe->ifc_ops->init_packet(rxe, &qp->pri_av, paylen, ack);
605 if (!skb)
606 return NULL;
607
608 ack->qp = qp;
609 ack->opcode = opcode;
610 ack->mask = rxe_opcode[opcode].mask;
611 ack->offset = pkt->offset;
612 ack->paylen = paylen;
613
614 /* fill in bth using the request packet headers */
615 memcpy(ack->hdr, pkt->hdr, pkt->offset + RXE_BTH_BYTES);
616
617 bth_set_opcode(ack, opcode);
618 bth_set_qpn(ack, qp->attr.dest_qp_num);
619 bth_set_pad(ack, pad);
620 bth_set_se(ack, 0);
621 bth_set_psn(ack, psn);
622 bth_set_ack(ack, 0);
623 ack->psn = psn;
624
625 if (ack->mask & RXE_AETH_MASK) {
626 aeth_set_syn(ack, syndrome);
627 aeth_set_msn(ack, qp->resp.msn);
628 }
629
630 if (ack->mask & RXE_ATMACK_MASK)
631 atmack_set_orig(ack, qp->resp.atomic_orig);
632
633 err = rxe->ifc_ops->prepare(rxe, ack, skb, &crc);
634 if (err) {
635 kfree_skb(skb);
636 return NULL;
637 }
638
639 if (crcp) {
640 /* CRC computation will be continued by the caller */
641 *crcp = crc;
642 } else {
643 p = payload_addr(ack) + payload + bth_pad(ack);
644 *p = ~crc;
645 }
646
647 return skb;
648}
649
650/* RDMA read response. If res is not NULL, then we have a current RDMA request
651 * being processed or replayed.
652 */
653static enum resp_states read_reply(struct rxe_qp *qp,
654 struct rxe_pkt_info *req_pkt)
655{
656 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
657 struct rxe_pkt_info ack_pkt;
658 struct sk_buff *skb;
659 int mtu = qp->mtu;
660 enum resp_states state;
661 int payload;
662 int opcode;
663 int err;
664 struct resp_res *res = qp->resp.res;
665 u32 icrc;
666 u32 *p;
667
668 if (!res) {
669 /* This is the first time we process that request. Get a
670 * resource
671 */
672 res = &qp->resp.resources[qp->resp.res_head];
673
674 free_rd_atomic_resource(qp, res);
675 rxe_advance_resp_resource(qp);
676
677 res->type = RXE_READ_MASK;
678
679 res->read.va = qp->resp.va;
680 res->read.va_org = qp->resp.va;
681
682 res->first_psn = req_pkt->psn;
683 res->last_psn = req_pkt->psn +
684 (reth_len(req_pkt) + mtu - 1) /
685 mtu - 1;
686 res->cur_psn = req_pkt->psn;
687
688 res->read.resid = qp->resp.resid;
689 res->read.length = qp->resp.resid;
690 res->read.rkey = qp->resp.rkey;
691
692 /* note res inherits the reference to mr from qp */
693 res->read.mr = qp->resp.mr;
694 qp->resp.mr = NULL;
695
696 qp->resp.res = res;
697 res->state = rdatm_res_state_new;
698 }
699
700 if (res->state == rdatm_res_state_new) {
701 if (res->read.resid <= mtu)
702 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_ONLY;
703 else
704 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST;
705 } else {
706 if (res->read.resid > mtu)
707 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE;
708 else
709 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_LAST;
710 }
711
712 res->state = rdatm_res_state_next;
713
714 payload = min_t(int, res->read.resid, mtu);
715
716 skb = prepare_ack_packet(qp, req_pkt, &ack_pkt, opcode, payload,
717 res->cur_psn, AETH_ACK_UNLIMITED, &icrc);
718 if (!skb)
719 return RESPST_ERR_RNR;
720
721 err = rxe_mem_copy(res->read.mr, res->read.va, payload_addr(&ack_pkt),
722 payload, from_mem_obj, &icrc);
723 if (err)
724 pr_err("Failed copying memory\n");
725
726 p = payload_addr(&ack_pkt) + payload + bth_pad(&ack_pkt);
727 *p = ~icrc;
728
729 err = rxe_xmit_packet(rxe, qp, &ack_pkt, skb);
730 if (err) {
731 pr_err("Failed sending RDMA reply.\n");
732 kfree_skb(skb);
733 return RESPST_ERR_RNR;
734 }
735
736 res->read.va += payload;
737 res->read.resid -= payload;
738 res->cur_psn = (res->cur_psn + 1) & BTH_PSN_MASK;
739
740 if (res->read.resid > 0) {
741 state = RESPST_DONE;
742 } else {
743 qp->resp.res = NULL;
744 qp->resp.opcode = -1;
745 qp->resp.psn = res->cur_psn;
746 state = RESPST_CLEANUP;
747 }
748
749 return state;
750}
751
Parav Pandite404f942016-09-28 20:26:26 +0000752static void build_rdma_network_hdr(union rdma_network_hdr *hdr,
753 struct rxe_pkt_info *pkt)
754{
755 struct sk_buff *skb = PKT_TO_SKB(pkt);
756
757 memset(hdr, 0, sizeof(*hdr));
758 if (skb->protocol == htons(ETH_P_IP))
759 memcpy(&hdr->roce4grh, ip_hdr(skb), sizeof(hdr->roce4grh));
760 else if (skb->protocol == htons(ETH_P_IPV6))
761 memcpy(&hdr->ibgrh, ipv6_hdr(skb), sizeof(hdr->ibgrh));
762}
763
Moni Shoua8700e3e2016-06-16 16:45:23 +0300764/* Executes a new request. A retried request never reach that function (send
765 * and writes are discarded, and reads and atomics are retried elsewhere.
766 */
767static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt)
768{
769 enum resp_states err;
770
771 if (pkt->mask & RXE_SEND_MASK) {
772 if (qp_type(qp) == IB_QPT_UD ||
773 qp_type(qp) == IB_QPT_SMI ||
774 qp_type(qp) == IB_QPT_GSI) {
775 union rdma_network_hdr hdr;
Moni Shoua8700e3e2016-06-16 16:45:23 +0300776
Parav Pandite404f942016-09-28 20:26:26 +0000777 build_rdma_network_hdr(&hdr, pkt);
Moni Shoua8700e3e2016-06-16 16:45:23 +0300778
779 err = send_data_in(qp, &hdr, sizeof(hdr));
780 if (err)
781 return err;
782 }
783 err = send_data_in(qp, payload_addr(pkt), payload_size(pkt));
784 if (err)
785 return err;
786 } else if (pkt->mask & RXE_WRITE_MASK) {
787 err = write_data_in(qp, pkt);
788 if (err)
789 return err;
790 } else if (pkt->mask & RXE_READ_MASK) {
791 /* For RDMA Read we can increment the msn now. See C9-148. */
792 qp->resp.msn++;
793 return RESPST_READ_REPLY;
794 } else if (pkt->mask & RXE_ATOMIC_MASK) {
795 err = process_atomic(qp, pkt);
796 if (err)
797 return err;
798 } else
799 /* Unreachable */
800 WARN_ON(1);
801
802 /* We successfully processed this new request. */
803 qp->resp.msn++;
804
805 /* next expected psn, read handles this separately */
806 qp->resp.psn = (pkt->psn + 1) & BTH_PSN_MASK;
807
808 qp->resp.opcode = pkt->opcode;
809 qp->resp.status = IB_WC_SUCCESS;
810
811 if (pkt->mask & RXE_COMP_MASK)
812 return RESPST_COMPLETE;
813 else if (qp_type(qp) == IB_QPT_RC)
814 return RESPST_ACKNOWLEDGE;
815 else
816 return RESPST_CLEANUP;
817}
818
819static enum resp_states do_complete(struct rxe_qp *qp,
820 struct rxe_pkt_info *pkt)
821{
822 struct rxe_cqe cqe;
823 struct ib_wc *wc = &cqe.ibwc;
824 struct ib_uverbs_wc *uwc = &cqe.uibwc;
825 struct rxe_recv_wqe *wqe = qp->resp.wqe;
826
827 if (unlikely(!wqe))
828 return RESPST_CLEANUP;
829
830 memset(&cqe, 0, sizeof(cqe));
831
832 wc->wr_id = wqe->wr_id;
833 wc->status = qp->resp.status;
834 wc->qp = &qp->ibqp;
835
836 /* fields after status are not required for errors */
837 if (wc->status == IB_WC_SUCCESS) {
838 wc->opcode = (pkt->mask & RXE_IMMDT_MASK &&
839 pkt->mask & RXE_WRITE_MASK) ?
840 IB_WC_RECV_RDMA_WITH_IMM : IB_WC_RECV;
841 wc->vendor_err = 0;
842 wc->byte_len = wqe->dma.length - wqe->dma.resid;
843
844 /* fields after byte_len are different between kernel and user
845 * space
846 */
847 if (qp->rcq->is_user) {
848 uwc->wc_flags = IB_WC_GRH;
849
850 if (pkt->mask & RXE_IMMDT_MASK) {
851 uwc->wc_flags |= IB_WC_WITH_IMM;
852 uwc->ex.imm_data =
853 (__u32 __force)immdt_imm(pkt);
854 }
855
856 if (pkt->mask & RXE_IETH_MASK) {
857 uwc->wc_flags |= IB_WC_WITH_INVALIDATE;
858 uwc->ex.invalidate_rkey = ieth_rkey(pkt);
859 }
860
861 uwc->qp_num = qp->ibqp.qp_num;
862
863 if (pkt->mask & RXE_DETH_MASK)
864 uwc->src_qp = deth_sqp(pkt);
865
866 uwc->port_num = qp->attr.port_num;
867 } else {
868 struct sk_buff *skb = PKT_TO_SKB(pkt);
869
870 wc->wc_flags = IB_WC_GRH | IB_WC_WITH_NETWORK_HDR_TYPE;
871 if (skb->protocol == htons(ETH_P_IP))
872 wc->network_hdr_type = RDMA_NETWORK_IPV4;
873 else
874 wc->network_hdr_type = RDMA_NETWORK_IPV6;
875
876 if (pkt->mask & RXE_IMMDT_MASK) {
877 wc->wc_flags |= IB_WC_WITH_IMM;
878 wc->ex.imm_data = immdt_imm(pkt);
879 }
880
881 if (pkt->mask & RXE_IETH_MASK) {
882 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
883 struct rxe_mem *rmr;
884
885 wc->wc_flags |= IB_WC_WITH_INVALIDATE;
886 wc->ex.invalidate_rkey = ieth_rkey(pkt);
887
888 rmr = rxe_pool_get_index(&rxe->mr_pool,
889 wc->ex.invalidate_rkey >> 8);
890 if (unlikely(!rmr)) {
Parav Pandite404f942016-09-28 20:26:26 +0000891 pr_err("Bad rkey %#x invalidation\n",
892 wc->ex.invalidate_rkey);
Moni Shoua8700e3e2016-06-16 16:45:23 +0300893 return RESPST_ERROR;
894 }
895 rmr->state = RXE_MEM_STATE_FREE;
896 }
897
898 wc->qp = &qp->ibqp;
899
900 if (pkt->mask & RXE_DETH_MASK)
901 wc->src_qp = deth_sqp(pkt);
902
903 wc->port_num = qp->attr.port_num;
904 }
905 }
906
907 /* have copy for srq and reference for !srq */
908 if (!qp->srq)
909 advance_consumer(qp->rq.queue);
910
911 qp->resp.wqe = NULL;
912
913 if (rxe_cq_post(qp->rcq, &cqe, pkt ? bth_se(pkt) : 1))
914 return RESPST_ERR_CQ_OVERFLOW;
915
916 if (qp->resp.state == QP_STATE_ERROR)
917 return RESPST_CHK_RESOURCE;
918
919 if (!pkt)
920 return RESPST_DONE;
921 else if (qp_type(qp) == IB_QPT_RC)
922 return RESPST_ACKNOWLEDGE;
923 else
924 return RESPST_CLEANUP;
925}
926
927static int send_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
928 u8 syndrome, u32 psn)
929{
930 int err = 0;
931 struct rxe_pkt_info ack_pkt;
932 struct sk_buff *skb;
933 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
934
935 skb = prepare_ack_packet(qp, pkt, &ack_pkt, IB_OPCODE_RC_ACKNOWLEDGE,
936 0, psn, syndrome, NULL);
937 if (!skb) {
938 err = -ENOMEM;
939 goto err1;
940 }
941
942 err = rxe_xmit_packet(rxe, qp, &ack_pkt, skb);
943 if (err) {
944 pr_err_ratelimited("Failed sending ack\n");
945 kfree_skb(skb);
946 }
947
948err1:
949 return err;
950}
951
952static int send_atomic_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
953 u8 syndrome)
954{
955 int rc = 0;
956 struct rxe_pkt_info ack_pkt;
957 struct sk_buff *skb;
958 struct sk_buff *skb_copy;
959 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
960 struct resp_res *res;
961
962 skb = prepare_ack_packet(qp, pkt, &ack_pkt,
963 IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE, 0, pkt->psn,
964 syndrome, NULL);
965 if (!skb) {
966 rc = -ENOMEM;
967 goto out;
968 }
969
970 skb_copy = skb_clone(skb, GFP_ATOMIC);
971 if (skb_copy)
972 rxe_add_ref(qp); /* for the new SKB */
973 else {
974 pr_warn("Could not clone atomic response\n");
975 rc = -ENOMEM;
976 goto out;
977 }
978
979 res = &qp->resp.resources[qp->resp.res_head];
980 free_rd_atomic_resource(qp, res);
981 rxe_advance_resp_resource(qp);
982
Yonatan Cohen90894882016-09-07 14:04:05 +0300983 memcpy(SKB_TO_PKT(skb), &ack_pkt, sizeof(skb->cb));
984
Moni Shoua8700e3e2016-06-16 16:45:23 +0300985 res->type = RXE_ATOMIC_MASK;
986 res->atomic.skb = skb;
Yonatan Cohen90894882016-09-07 14:04:05 +0300987 res->first_psn = ack_pkt.psn;
988 res->last_psn = ack_pkt.psn;
989 res->cur_psn = ack_pkt.psn;
Moni Shoua8700e3e2016-06-16 16:45:23 +0300990
991 rc = rxe_xmit_packet(rxe, qp, &ack_pkt, skb_copy);
992 if (rc) {
993 pr_err_ratelimited("Failed sending ack\n");
994 rxe_drop_ref(qp);
995 kfree_skb(skb_copy);
996 }
997
998out:
999 return rc;
1000}
1001
1002static enum resp_states acknowledge(struct rxe_qp *qp,
1003 struct rxe_pkt_info *pkt)
1004{
1005 if (qp_type(qp) != IB_QPT_RC)
1006 return RESPST_CLEANUP;
1007
1008 if (qp->resp.aeth_syndrome != AETH_ACK_UNLIMITED)
1009 send_ack(qp, pkt, qp->resp.aeth_syndrome, pkt->psn);
1010 else if (pkt->mask & RXE_ATOMIC_MASK)
1011 send_atomic_ack(qp, pkt, AETH_ACK_UNLIMITED);
1012 else if (bth_ack(pkt))
1013 send_ack(qp, pkt, AETH_ACK_UNLIMITED, pkt->psn);
1014
1015 return RESPST_CLEANUP;
1016}
1017
1018static enum resp_states cleanup(struct rxe_qp *qp,
1019 struct rxe_pkt_info *pkt)
1020{
1021 struct sk_buff *skb;
1022
1023 if (pkt) {
1024 skb = skb_dequeue(&qp->req_pkts);
1025 rxe_drop_ref(qp);
1026 kfree_skb(skb);
1027 }
1028
1029 if (qp->resp.mr) {
1030 rxe_drop_ref(qp->resp.mr);
1031 qp->resp.mr = NULL;
1032 }
1033
1034 return RESPST_DONE;
1035}
1036
1037static struct resp_res *find_resource(struct rxe_qp *qp, u32 psn)
1038{
1039 int i;
1040
1041 for (i = 0; i < qp->attr.max_rd_atomic; i++) {
1042 struct resp_res *res = &qp->resp.resources[i];
1043
1044 if (res->type == 0)
1045 continue;
1046
1047 if (psn_compare(psn, res->first_psn) >= 0 &&
1048 psn_compare(psn, res->last_psn) <= 0) {
1049 return res;
1050 }
1051 }
1052
1053 return NULL;
1054}
1055
1056static enum resp_states duplicate_request(struct rxe_qp *qp,
1057 struct rxe_pkt_info *pkt)
1058{
1059 enum resp_states rc;
1060
1061 if (pkt->mask & RXE_SEND_MASK ||
1062 pkt->mask & RXE_WRITE_MASK) {
1063 /* SEND. Ack again and cleanup. C9-105. */
1064 if (bth_ack(pkt))
1065 send_ack(qp, pkt, AETH_ACK_UNLIMITED, qp->resp.psn - 1);
1066 rc = RESPST_CLEANUP;
1067 goto out;
1068 } else if (pkt->mask & RXE_READ_MASK) {
1069 struct resp_res *res;
1070
1071 res = find_resource(qp, pkt->psn);
1072 if (!res) {
1073 /* Resource not found. Class D error. Drop the
1074 * request.
1075 */
1076 rc = RESPST_CLEANUP;
1077 goto out;
1078 } else {
1079 /* Ensure this new request is the same as the previous
1080 * one or a subset of it.
1081 */
1082 u64 iova = reth_va(pkt);
1083 u32 resid = reth_len(pkt);
1084
1085 if (iova < res->read.va_org ||
1086 resid > res->read.length ||
1087 (iova + resid) > (res->read.va_org +
1088 res->read.length)) {
1089 rc = RESPST_CLEANUP;
1090 goto out;
1091 }
1092
1093 if (reth_rkey(pkt) != res->read.rkey) {
1094 rc = RESPST_CLEANUP;
1095 goto out;
1096 }
1097
1098 res->cur_psn = pkt->psn;
1099 res->state = (pkt->psn == res->first_psn) ?
1100 rdatm_res_state_new :
1101 rdatm_res_state_replay;
1102
1103 /* Reset the resource, except length. */
1104 res->read.va_org = iova;
1105 res->read.va = iova;
1106 res->read.resid = resid;
1107
1108 /* Replay the RDMA read reply. */
1109 qp->resp.res = res;
1110 rc = RESPST_READ_REPLY;
1111 goto out;
1112 }
1113 } else {
1114 struct resp_res *res;
1115
1116 /* Find the operation in our list of responder resources. */
1117 res = find_resource(qp, pkt->psn);
1118 if (res) {
1119 struct sk_buff *skb_copy;
1120
1121 skb_copy = skb_clone(res->atomic.skb, GFP_ATOMIC);
1122 if (skb_copy) {
1123 rxe_add_ref(qp); /* for the new SKB */
1124 } else {
1125 pr_warn("Couldn't clone atomic resp\n");
1126 rc = RESPST_CLEANUP;
1127 goto out;
1128 }
Yonatan Cohen90894882016-09-07 14:04:05 +03001129
Moni Shoua8700e3e2016-06-16 16:45:23 +03001130 /* Resend the result. */
1131 rc = rxe_xmit_packet(to_rdev(qp->ibqp.device), qp,
1132 pkt, skb_copy);
1133 if (rc) {
1134 pr_err("Failed resending result. This flow is not handled - skb ignored\n");
1135 kfree_skb(skb_copy);
1136 rc = RESPST_CLEANUP;
1137 goto out;
1138 }
1139 }
1140
1141 /* Resource not found. Class D error. Drop the request. */
1142 rc = RESPST_CLEANUP;
1143 goto out;
1144 }
1145out:
1146 return rc;
1147}
1148
1149/* Process a class A or C. Both are treated the same in this implementation. */
1150static void do_class_ac_error(struct rxe_qp *qp, u8 syndrome,
1151 enum ib_wc_status status)
1152{
1153 qp->resp.aeth_syndrome = syndrome;
1154 qp->resp.status = status;
1155
1156 /* indicate that we should go through the ERROR state */
1157 qp->resp.goto_error = 1;
1158}
1159
1160static enum resp_states do_class_d1e_error(struct rxe_qp *qp)
1161{
1162 /* UC */
1163 if (qp->srq) {
1164 /* Class E */
1165 qp->resp.drop_msg = 1;
1166 if (qp->resp.wqe) {
1167 qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1168 return RESPST_COMPLETE;
1169 } else {
1170 return RESPST_CLEANUP;
1171 }
1172 } else {
1173 /* Class D1. This packet may be the start of a
1174 * new message and could be valid. The previous
1175 * message is invalid and ignored. reset the
1176 * recv wr to its original state
1177 */
1178 if (qp->resp.wqe) {
1179 qp->resp.wqe->dma.resid = qp->resp.wqe->dma.length;
1180 qp->resp.wqe->dma.cur_sge = 0;
1181 qp->resp.wqe->dma.sge_offset = 0;
1182 qp->resp.opcode = -1;
1183 }
1184
1185 if (qp->resp.mr) {
1186 rxe_drop_ref(qp->resp.mr);
1187 qp->resp.mr = NULL;
1188 }
1189
1190 return RESPST_CLEANUP;
1191 }
1192}
1193
1194int rxe_responder(void *arg)
1195{
1196 struct rxe_qp *qp = (struct rxe_qp *)arg;
1197 enum resp_states state;
1198 struct rxe_pkt_info *pkt = NULL;
1199 int ret = 0;
1200
1201 qp->resp.aeth_syndrome = AETH_ACK_UNLIMITED;
1202
1203 if (!qp->valid) {
1204 ret = -EINVAL;
1205 goto done;
1206 }
1207
1208 switch (qp->resp.state) {
1209 case QP_STATE_RESET:
1210 state = RESPST_RESET;
1211 break;
1212
1213 default:
1214 state = RESPST_GET_REQ;
1215 break;
1216 }
1217
1218 while (1) {
Parav Pandite404f942016-09-28 20:26:26 +00001219 pr_debug("qp#%d state = %s\n", qp_num(qp),
1220 resp_state_name[state]);
Moni Shoua8700e3e2016-06-16 16:45:23 +03001221 switch (state) {
1222 case RESPST_GET_REQ:
1223 state = get_req(qp, &pkt);
1224 break;
1225 case RESPST_CHK_PSN:
1226 state = check_psn(qp, pkt);
1227 break;
1228 case RESPST_CHK_OP_SEQ:
1229 state = check_op_seq(qp, pkt);
1230 break;
1231 case RESPST_CHK_OP_VALID:
1232 state = check_op_valid(qp, pkt);
1233 break;
1234 case RESPST_CHK_RESOURCE:
1235 state = check_resource(qp, pkt);
1236 break;
1237 case RESPST_CHK_LENGTH:
1238 state = check_length(qp, pkt);
1239 break;
1240 case RESPST_CHK_RKEY:
1241 state = check_rkey(qp, pkt);
1242 break;
1243 case RESPST_EXECUTE:
1244 state = execute(qp, pkt);
1245 break;
1246 case RESPST_COMPLETE:
1247 state = do_complete(qp, pkt);
1248 break;
1249 case RESPST_READ_REPLY:
1250 state = read_reply(qp, pkt);
1251 break;
1252 case RESPST_ACKNOWLEDGE:
1253 state = acknowledge(qp, pkt);
1254 break;
1255 case RESPST_CLEANUP:
1256 state = cleanup(qp, pkt);
1257 break;
1258 case RESPST_DUPLICATE_REQUEST:
1259 state = duplicate_request(qp, pkt);
1260 break;
1261 case RESPST_ERR_PSN_OUT_OF_SEQ:
1262 /* RC only - Class B. Drop packet. */
1263 send_ack(qp, pkt, AETH_NAK_PSN_SEQ_ERROR, qp->resp.psn);
1264 state = RESPST_CLEANUP;
1265 break;
1266
1267 case RESPST_ERR_TOO_MANY_RDMA_ATM_REQ:
1268 case RESPST_ERR_MISSING_OPCODE_FIRST:
1269 case RESPST_ERR_MISSING_OPCODE_LAST_C:
1270 case RESPST_ERR_UNSUPPORTED_OPCODE:
1271 case RESPST_ERR_MISALIGNED_ATOMIC:
1272 /* RC Only - Class C. */
1273 do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1274 IB_WC_REM_INV_REQ_ERR);
1275 state = RESPST_COMPLETE;
1276 break;
1277
1278 case RESPST_ERR_MISSING_OPCODE_LAST_D1E:
1279 state = do_class_d1e_error(qp);
1280 break;
1281 case RESPST_ERR_RNR:
1282 if (qp_type(qp) == IB_QPT_RC) {
1283 /* RC - class B */
1284 send_ack(qp, pkt, AETH_RNR_NAK |
1285 (~AETH_TYPE_MASK &
1286 qp->attr.min_rnr_timer),
1287 pkt->psn);
1288 } else {
1289 /* UD/UC - class D */
1290 qp->resp.drop_msg = 1;
1291 }
1292 state = RESPST_CLEANUP;
1293 break;
1294
1295 case RESPST_ERR_RKEY_VIOLATION:
1296 if (qp_type(qp) == IB_QPT_RC) {
1297 /* Class C */
1298 do_class_ac_error(qp, AETH_NAK_REM_ACC_ERR,
1299 IB_WC_REM_ACCESS_ERR);
1300 state = RESPST_COMPLETE;
1301 } else {
1302 qp->resp.drop_msg = 1;
1303 if (qp->srq) {
1304 /* UC/SRQ Class D */
1305 qp->resp.status = IB_WC_REM_ACCESS_ERR;
1306 state = RESPST_COMPLETE;
1307 } else {
1308 /* UC/non-SRQ Class E. */
1309 state = RESPST_CLEANUP;
1310 }
1311 }
1312 break;
1313
1314 case RESPST_ERR_LENGTH:
1315 if (qp_type(qp) == IB_QPT_RC) {
1316 /* Class C */
1317 do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1318 IB_WC_REM_INV_REQ_ERR);
1319 state = RESPST_COMPLETE;
1320 } else if (qp->srq) {
1321 /* UC/UD - class E */
1322 qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1323 state = RESPST_COMPLETE;
1324 } else {
1325 /* UC/UD - class D */
1326 qp->resp.drop_msg = 1;
1327 state = RESPST_CLEANUP;
1328 }
1329 break;
1330
1331 case RESPST_ERR_MALFORMED_WQE:
1332 /* All, Class A. */
1333 do_class_ac_error(qp, AETH_NAK_REM_OP_ERR,
1334 IB_WC_LOC_QP_OP_ERR);
1335 state = RESPST_COMPLETE;
1336 break;
1337
1338 case RESPST_ERR_CQ_OVERFLOW:
1339 /* All - Class G */
1340 state = RESPST_ERROR;
1341 break;
1342
1343 case RESPST_DONE:
1344 if (qp->resp.goto_error) {
1345 state = RESPST_ERROR;
1346 break;
1347 }
1348
1349 goto done;
1350
1351 case RESPST_EXIT:
1352 if (qp->resp.goto_error) {
1353 state = RESPST_ERROR;
1354 break;
1355 }
1356
1357 goto exit;
1358
1359 case RESPST_RESET: {
1360 struct sk_buff *skb;
1361
1362 while ((skb = skb_dequeue(&qp->req_pkts))) {
1363 rxe_drop_ref(qp);
1364 kfree_skb(skb);
1365 }
1366
1367 while (!qp->srq && qp->rq.queue &&
1368 queue_head(qp->rq.queue))
1369 advance_consumer(qp->rq.queue);
1370
1371 qp->resp.wqe = NULL;
1372 goto exit;
1373 }
1374
1375 case RESPST_ERROR:
1376 qp->resp.goto_error = 0;
1377 pr_warn("qp#%d moved to error state\n", qp_num(qp));
1378 rxe_qp_error(qp);
1379 goto exit;
1380
1381 default:
1382 WARN_ON(1);
1383 }
1384 }
1385
1386exit:
1387 ret = -EAGAIN;
1388done:
1389 return ret;
1390}