1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2 /*
3 * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
4 * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
5 */
6
7 #include <linux/skbuff.h>
8
9 #include "rxe.h"
10 #include "rxe_loc.h"
11 #include "rxe_queue.h"
12
13 enum resp_states {
14 RESPST_NONE,
15 RESPST_GET_REQ,
16 RESPST_CHK_PSN,
17 RESPST_CHK_OP_SEQ,
18 RESPST_CHK_OP_VALID,
19 RESPST_CHK_RESOURCE,
20 RESPST_CHK_LENGTH,
21 RESPST_CHK_RKEY,
22 RESPST_EXECUTE,
23 RESPST_READ_REPLY,
24 RESPST_COMPLETE,
25 RESPST_ACKNOWLEDGE,
26 RESPST_CLEANUP,
27 RESPST_DUPLICATE_REQUEST,
28 RESPST_ERR_MALFORMED_WQE,
29 RESPST_ERR_UNSUPPORTED_OPCODE,
30 RESPST_ERR_MISALIGNED_ATOMIC,
31 RESPST_ERR_PSN_OUT_OF_SEQ,
32 RESPST_ERR_MISSING_OPCODE_FIRST,
33 RESPST_ERR_MISSING_OPCODE_LAST_C,
34 RESPST_ERR_MISSING_OPCODE_LAST_D1E,
35 RESPST_ERR_TOO_MANY_RDMA_ATM_REQ,
36 RESPST_ERR_RNR,
37 RESPST_ERR_RKEY_VIOLATION,
38 RESPST_ERR_LENGTH,
39 RESPST_ERR_CQ_OVERFLOW,
40 RESPST_ERROR,
41 RESPST_RESET,
42 RESPST_DONE,
43 RESPST_EXIT,
44 };
45
46 static char *resp_state_name[] = {
47 [RESPST_NONE] = "NONE",
48 [RESPST_GET_REQ] = "GET_REQ",
49 [RESPST_CHK_PSN] = "CHK_PSN",
50 [RESPST_CHK_OP_SEQ] = "CHK_OP_SEQ",
51 [RESPST_CHK_OP_VALID] = "CHK_OP_VALID",
52 [RESPST_CHK_RESOURCE] = "CHK_RESOURCE",
53 [RESPST_CHK_LENGTH] = "CHK_LENGTH",
54 [RESPST_CHK_RKEY] = "CHK_RKEY",
55 [RESPST_EXECUTE] = "EXECUTE",
56 [RESPST_READ_REPLY] = "READ_REPLY",
57 [RESPST_COMPLETE] = "COMPLETE",
58 [RESPST_ACKNOWLEDGE] = "ACKNOWLEDGE",
59 [RESPST_CLEANUP] = "CLEANUP",
60 [RESPST_DUPLICATE_REQUEST] = "DUPLICATE_REQUEST",
61 [RESPST_ERR_MALFORMED_WQE] = "ERR_MALFORMED_WQE",
62 [RESPST_ERR_UNSUPPORTED_OPCODE] = "ERR_UNSUPPORTED_OPCODE",
63 [RESPST_ERR_MISALIGNED_ATOMIC] = "ERR_MISALIGNED_ATOMIC",
64 [RESPST_ERR_PSN_OUT_OF_SEQ] = "ERR_PSN_OUT_OF_SEQ",
65 [RESPST_ERR_MISSING_OPCODE_FIRST] = "ERR_MISSING_OPCODE_FIRST",
66 [RESPST_ERR_MISSING_OPCODE_LAST_C] = "ERR_MISSING_OPCODE_LAST_C",
67 [RESPST_ERR_MISSING_OPCODE_LAST_D1E] = "ERR_MISSING_OPCODE_LAST_D1E",
68 [RESPST_ERR_TOO_MANY_RDMA_ATM_REQ] = "ERR_TOO_MANY_RDMA_ATM_REQ",
69 [RESPST_ERR_RNR] = "ERR_RNR",
70 [RESPST_ERR_RKEY_VIOLATION] = "ERR_RKEY_VIOLATION",
71 [RESPST_ERR_LENGTH] = "ERR_LENGTH",
72 [RESPST_ERR_CQ_OVERFLOW] = "ERR_CQ_OVERFLOW",
73 [RESPST_ERROR] = "ERROR",
74 [RESPST_RESET] = "RESET",
75 [RESPST_DONE] = "DONE",
76 [RESPST_EXIT] = "EXIT",
77 };
78
79 /* rxe_recv calls here to add a request packet to the input queue */
rxe_resp_queue_pkt(struct rxe_qp * qp,struct sk_buff * skb)80 void rxe_resp_queue_pkt(struct rxe_qp *qp, struct sk_buff *skb)
81 {
82 int must_sched;
83 struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
84
85 skb_queue_tail(&qp->req_pkts, skb);
86
87 must_sched = (pkt->opcode == IB_OPCODE_RC_RDMA_READ_REQUEST) ||
88 (skb_queue_len(&qp->req_pkts) > 1);
89
90 rxe_run_task(&qp->resp.task, must_sched);
91 }
92
get_req(struct rxe_qp * qp,struct rxe_pkt_info ** pkt_p)93 static inline enum resp_states get_req(struct rxe_qp *qp,
94 struct rxe_pkt_info **pkt_p)
95 {
96 struct sk_buff *skb;
97
98 if (qp->resp.state == QP_STATE_ERROR) {
99 while ((skb = skb_dequeue(&qp->req_pkts))) {
100 rxe_drop_ref(qp);
101 kfree_skb(skb);
102 }
103
104 /* go drain recv wr queue */
105 return RESPST_CHK_RESOURCE;
106 }
107
108 skb = skb_peek(&qp->req_pkts);
109 if (!skb)
110 return RESPST_EXIT;
111
112 *pkt_p = SKB_TO_PKT(skb);
113
114 return (qp->resp.res) ? RESPST_READ_REPLY : RESPST_CHK_PSN;
115 }
116
check_psn(struct rxe_qp * qp,struct rxe_pkt_info * pkt)117 static enum resp_states check_psn(struct rxe_qp *qp,
118 struct rxe_pkt_info *pkt)
119 {
120 int diff = psn_compare(pkt->psn, qp->resp.psn);
121 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
122
123 switch (qp_type(qp)) {
124 case IB_QPT_RC:
125 if (diff > 0) {
126 if (qp->resp.sent_psn_nak)
127 return RESPST_CLEANUP;
128
129 qp->resp.sent_psn_nak = 1;
130 rxe_counter_inc(rxe, RXE_CNT_OUT_OF_SEQ_REQ);
131 return RESPST_ERR_PSN_OUT_OF_SEQ;
132
133 } else if (diff < 0) {
134 rxe_counter_inc(rxe, RXE_CNT_DUP_REQ);
135 return RESPST_DUPLICATE_REQUEST;
136 }
137
138 if (qp->resp.sent_psn_nak)
139 qp->resp.sent_psn_nak = 0;
140
141 break;
142
143 case IB_QPT_UC:
144 if (qp->resp.drop_msg || diff != 0) {
145 if (pkt->mask & RXE_START_MASK) {
146 qp->resp.drop_msg = 0;
147 return RESPST_CHK_OP_SEQ;
148 }
149
150 qp->resp.drop_msg = 1;
151 return RESPST_CLEANUP;
152 }
153 break;
154 default:
155 break;
156 }
157
158 return RESPST_CHK_OP_SEQ;
159 }
160
check_op_seq(struct rxe_qp * qp,struct rxe_pkt_info * pkt)161 static enum resp_states check_op_seq(struct rxe_qp *qp,
162 struct rxe_pkt_info *pkt)
163 {
164 switch (qp_type(qp)) {
165 case IB_QPT_RC:
166 switch (qp->resp.opcode) {
167 case IB_OPCODE_RC_SEND_FIRST:
168 case IB_OPCODE_RC_SEND_MIDDLE:
169 switch (pkt->opcode) {
170 case IB_OPCODE_RC_SEND_MIDDLE:
171 case IB_OPCODE_RC_SEND_LAST:
172 case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE:
173 case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE:
174 return RESPST_CHK_OP_VALID;
175 default:
176 return RESPST_ERR_MISSING_OPCODE_LAST_C;
177 }
178
179 case IB_OPCODE_RC_RDMA_WRITE_FIRST:
180 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
181 switch (pkt->opcode) {
182 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
183 case IB_OPCODE_RC_RDMA_WRITE_LAST:
184 case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
185 return RESPST_CHK_OP_VALID;
186 default:
187 return RESPST_ERR_MISSING_OPCODE_LAST_C;
188 }
189
190 default:
191 switch (pkt->opcode) {
192 case IB_OPCODE_RC_SEND_MIDDLE:
193 case IB_OPCODE_RC_SEND_LAST:
194 case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE:
195 case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE:
196 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
197 case IB_OPCODE_RC_RDMA_WRITE_LAST:
198 case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
199 return RESPST_ERR_MISSING_OPCODE_FIRST;
200 default:
201 return RESPST_CHK_OP_VALID;
202 }
203 }
204 break;
205
206 case IB_QPT_UC:
207 switch (qp->resp.opcode) {
208 case IB_OPCODE_UC_SEND_FIRST:
209 case IB_OPCODE_UC_SEND_MIDDLE:
210 switch (pkt->opcode) {
211 case IB_OPCODE_UC_SEND_MIDDLE:
212 case IB_OPCODE_UC_SEND_LAST:
213 case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE:
214 return RESPST_CHK_OP_VALID;
215 default:
216 return RESPST_ERR_MISSING_OPCODE_LAST_D1E;
217 }
218
219 case IB_OPCODE_UC_RDMA_WRITE_FIRST:
220 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
221 switch (pkt->opcode) {
222 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
223 case IB_OPCODE_UC_RDMA_WRITE_LAST:
224 case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
225 return RESPST_CHK_OP_VALID;
226 default:
227 return RESPST_ERR_MISSING_OPCODE_LAST_D1E;
228 }
229
230 default:
231 switch (pkt->opcode) {
232 case IB_OPCODE_UC_SEND_MIDDLE:
233 case IB_OPCODE_UC_SEND_LAST:
234 case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE:
235 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
236 case IB_OPCODE_UC_RDMA_WRITE_LAST:
237 case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
238 qp->resp.drop_msg = 1;
239 return RESPST_CLEANUP;
240 default:
241 return RESPST_CHK_OP_VALID;
242 }
243 }
244 break;
245
246 default:
247 return RESPST_CHK_OP_VALID;
248 }
249 }
250
check_op_valid(struct rxe_qp * qp,struct rxe_pkt_info * pkt)251 static enum resp_states check_op_valid(struct rxe_qp *qp,
252 struct rxe_pkt_info *pkt)
253 {
254 switch (qp_type(qp)) {
255 case IB_QPT_RC:
256 if (((pkt->mask & RXE_READ_MASK) &&
257 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_READ)) ||
258 ((pkt->mask & RXE_WRITE_MASK) &&
259 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) ||
260 ((pkt->mask & RXE_ATOMIC_MASK) &&
261 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) {
262 return RESPST_ERR_UNSUPPORTED_OPCODE;
263 }
264
265 break;
266
267 case IB_QPT_UC:
268 if ((pkt->mask & RXE_WRITE_MASK) &&
269 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) {
270 qp->resp.drop_msg = 1;
271 return RESPST_CLEANUP;
272 }
273
274 break;
275
276 case IB_QPT_UD:
277 case IB_QPT_SMI:
278 case IB_QPT_GSI:
279 break;
280
281 default:
282 WARN_ON_ONCE(1);
283 break;
284 }
285
286 return RESPST_CHK_RESOURCE;
287 }
288
get_srq_wqe(struct rxe_qp * qp)289 static enum resp_states get_srq_wqe(struct rxe_qp *qp)
290 {
291 struct rxe_srq *srq = qp->srq;
292 struct rxe_queue *q = srq->rq.queue;
293 struct rxe_recv_wqe *wqe;
294 struct ib_event ev;
295
296 if (srq->error)
297 return RESPST_ERR_RNR;
298
299 spin_lock_bh(&srq->rq.consumer_lock);
300
301 wqe = queue_head(q);
302 if (!wqe) {
303 spin_unlock_bh(&srq->rq.consumer_lock);
304 return RESPST_ERR_RNR;
305 }
306
307 /* note kernel and user space recv wqes have same size */
308 memcpy(&qp->resp.srq_wqe, wqe, sizeof(qp->resp.srq_wqe));
309
310 qp->resp.wqe = &qp->resp.srq_wqe.wqe;
311 advance_consumer(q);
312
313 if (srq->limit && srq->ibsrq.event_handler &&
314 (queue_count(q) < srq->limit)) {
315 srq->limit = 0;
316 goto event;
317 }
318
319 spin_unlock_bh(&srq->rq.consumer_lock);
320 return RESPST_CHK_LENGTH;
321
322 event:
323 spin_unlock_bh(&srq->rq.consumer_lock);
324 ev.device = qp->ibqp.device;
325 ev.element.srq = qp->ibqp.srq;
326 ev.event = IB_EVENT_SRQ_LIMIT_REACHED;
327 srq->ibsrq.event_handler(&ev, srq->ibsrq.srq_context);
328 return RESPST_CHK_LENGTH;
329 }
330
check_resource(struct rxe_qp * qp,struct rxe_pkt_info * pkt)331 static enum resp_states check_resource(struct rxe_qp *qp,
332 struct rxe_pkt_info *pkt)
333 {
334 struct rxe_srq *srq = qp->srq;
335
336 if (qp->resp.state == QP_STATE_ERROR) {
337 if (qp->resp.wqe) {
338 qp->resp.status = IB_WC_WR_FLUSH_ERR;
339 return RESPST_COMPLETE;
340 } else if (!srq) {
341 qp->resp.wqe = queue_head(qp->rq.queue);
342 if (qp->resp.wqe) {
343 qp->resp.status = IB_WC_WR_FLUSH_ERR;
344 return RESPST_COMPLETE;
345 } else {
346 return RESPST_EXIT;
347 }
348 } else {
349 return RESPST_EXIT;
350 }
351 }
352
353 if (pkt->mask & RXE_READ_OR_ATOMIC) {
354 /* it is the requesters job to not send
355 * too many read/atomic ops, we just
356 * recycle the responder resource queue
357 */
358 if (likely(qp->attr.max_dest_rd_atomic > 0))
359 return RESPST_CHK_LENGTH;
360 else
361 return RESPST_ERR_TOO_MANY_RDMA_ATM_REQ;
362 }
363
364 if (pkt->mask & RXE_RWR_MASK) {
365 if (srq)
366 return get_srq_wqe(qp);
367
368 qp->resp.wqe = queue_head(qp->rq.queue);
369 return (qp->resp.wqe) ? RESPST_CHK_LENGTH : RESPST_ERR_RNR;
370 }
371
372 return RESPST_CHK_LENGTH;
373 }
374
check_length(struct rxe_qp * qp,struct rxe_pkt_info * pkt)375 static enum resp_states check_length(struct rxe_qp *qp,
376 struct rxe_pkt_info *pkt)
377 {
378 switch (qp_type(qp)) {
379 case IB_QPT_RC:
380 return RESPST_CHK_RKEY;
381
382 case IB_QPT_UC:
383 return RESPST_CHK_RKEY;
384
385 default:
386 return RESPST_CHK_RKEY;
387 }
388 }
389
check_rkey(struct rxe_qp * qp,struct rxe_pkt_info * pkt)390 static enum resp_states check_rkey(struct rxe_qp *qp,
391 struct rxe_pkt_info *pkt)
392 {
393 struct rxe_mem *mem = NULL;
394 u64 va;
395 u32 rkey;
396 u32 resid;
397 u32 pktlen;
398 int mtu = qp->mtu;
399 enum resp_states state;
400 int access;
401
402 if (pkt->mask & (RXE_READ_MASK | RXE_WRITE_MASK)) {
403 if (pkt->mask & RXE_RETH_MASK) {
404 qp->resp.va = reth_va(pkt);
405 qp->resp.rkey = reth_rkey(pkt);
406 qp->resp.resid = reth_len(pkt);
407 qp->resp.length = reth_len(pkt);
408 }
409 access = (pkt->mask & RXE_READ_MASK) ? IB_ACCESS_REMOTE_READ
410 : IB_ACCESS_REMOTE_WRITE;
411 } else if (pkt->mask & RXE_ATOMIC_MASK) {
412 qp->resp.va = atmeth_va(pkt);
413 qp->resp.rkey = atmeth_rkey(pkt);
414 qp->resp.resid = sizeof(u64);
415 access = IB_ACCESS_REMOTE_ATOMIC;
416 } else {
417 return RESPST_EXECUTE;
418 }
419
420 /* A zero-byte op is not required to set an addr or rkey. */
421 if ((pkt->mask & (RXE_READ_MASK | RXE_WRITE_OR_SEND)) &&
422 (pkt->mask & RXE_RETH_MASK) &&
423 reth_len(pkt) == 0) {
424 return RESPST_EXECUTE;
425 }
426
427 va = qp->resp.va;
428 rkey = qp->resp.rkey;
429 resid = qp->resp.resid;
430 pktlen = payload_size(pkt);
431
432 mem = lookup_mem(qp->pd, access, rkey, lookup_remote);
433 if (!mem) {
434 state = RESPST_ERR_RKEY_VIOLATION;
435 goto err;
436 }
437
438 if (unlikely(mem->state == RXE_MEM_STATE_FREE)) {
439 state = RESPST_ERR_RKEY_VIOLATION;
440 goto err;
441 }
442
443 if (mem_check_range(mem, va, resid)) {
444 state = RESPST_ERR_RKEY_VIOLATION;
445 goto err;
446 }
447
448 if (pkt->mask & RXE_WRITE_MASK) {
449 if (resid > mtu) {
450 if (pktlen != mtu || bth_pad(pkt)) {
451 state = RESPST_ERR_LENGTH;
452 goto err;
453 }
454 } else {
455 if (pktlen != resid) {
456 state = RESPST_ERR_LENGTH;
457 goto err;
458 }
459 if ((bth_pad(pkt) != (0x3 & (-resid)))) {
460 /* This case may not be exactly that
461 * but nothing else fits.
462 */
463 state = RESPST_ERR_LENGTH;
464 goto err;
465 }
466 }
467 }
468
469 WARN_ON_ONCE(qp->resp.mr);
470
471 qp->resp.mr = mem;
472 return RESPST_EXECUTE;
473
474 err:
475 if (mem)
476 rxe_drop_ref(mem);
477 return state;
478 }
479
send_data_in(struct rxe_qp * qp,void * data_addr,int data_len)480 static enum resp_states send_data_in(struct rxe_qp *qp, void *data_addr,
481 int data_len)
482 {
483 int err;
484
485 err = copy_data(qp->pd, IB_ACCESS_LOCAL_WRITE, &qp->resp.wqe->dma,
486 data_addr, data_len, to_mem_obj, NULL);
487 if (unlikely(err))
488 return (err == -ENOSPC) ? RESPST_ERR_LENGTH
489 : RESPST_ERR_MALFORMED_WQE;
490
491 return RESPST_NONE;
492 }
493
write_data_in(struct rxe_qp * qp,struct rxe_pkt_info * pkt)494 static enum resp_states write_data_in(struct rxe_qp *qp,
495 struct rxe_pkt_info *pkt)
496 {
497 enum resp_states rc = RESPST_NONE;
498 int err;
499 int data_len = payload_size(pkt);
500
501 err = rxe_mem_copy(qp->resp.mr, qp->resp.va, payload_addr(pkt),
502 data_len, to_mem_obj, NULL);
503 if (err) {
504 rc = RESPST_ERR_RKEY_VIOLATION;
505 goto out;
506 }
507
508 qp->resp.va += data_len;
509 qp->resp.resid -= data_len;
510
511 out:
512 return rc;
513 }
514
515 /* Guarantee atomicity of atomic operations at the machine level. */
516 static DEFINE_SPINLOCK(atomic_ops_lock);
517
process_atomic(struct rxe_qp * qp,struct rxe_pkt_info * pkt)518 static enum resp_states process_atomic(struct rxe_qp *qp,
519 struct rxe_pkt_info *pkt)
520 {
521 u64 iova = atmeth_va(pkt);
522 u64 *vaddr;
523 enum resp_states ret;
524 struct rxe_mem *mr = qp->resp.mr;
525
526 if (mr->state != RXE_MEM_STATE_VALID) {
527 ret = RESPST_ERR_RKEY_VIOLATION;
528 goto out;
529 }
530
531 vaddr = iova_to_vaddr(mr, iova, sizeof(u64));
532
533 /* check vaddr is 8 bytes aligned. */
534 if (!vaddr || (uintptr_t)vaddr & 7) {
535 ret = RESPST_ERR_MISALIGNED_ATOMIC;
536 goto out;
537 }
538
539 spin_lock_bh(&atomic_ops_lock);
540
541 qp->resp.atomic_orig = *vaddr;
542
543 if (pkt->opcode == IB_OPCODE_RC_COMPARE_SWAP ||
544 pkt->opcode == IB_OPCODE_RD_COMPARE_SWAP) {
545 if (*vaddr == atmeth_comp(pkt))
546 *vaddr = atmeth_swap_add(pkt);
547 } else {
548 *vaddr += atmeth_swap_add(pkt);
549 }
550
551 spin_unlock_bh(&atomic_ops_lock);
552
553 ret = RESPST_NONE;
554 out:
555 return ret;
556 }
557
prepare_ack_packet(struct rxe_qp * qp,struct rxe_pkt_info * pkt,struct rxe_pkt_info * ack,int opcode,int payload,u32 psn,u8 syndrome,u32 * crcp)558 static struct sk_buff *prepare_ack_packet(struct rxe_qp *qp,
559 struct rxe_pkt_info *pkt,
560 struct rxe_pkt_info *ack,
561 int opcode,
562 int payload,
563 u32 psn,
564 u8 syndrome,
565 u32 *crcp)
566 {
567 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
568 struct sk_buff *skb;
569 u32 crc = 0;
570 u32 *p;
571 int paylen;
572 int pad;
573 int err;
574
575 /*
576 * allocate packet
577 */
578 pad = (-payload) & 0x3;
579 paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE;
580
581 skb = rxe_init_packet(rxe, &qp->pri_av, paylen, ack);
582 if (!skb)
583 return NULL;
584
585 ack->qp = qp;
586 ack->opcode = opcode;
587 ack->mask = rxe_opcode[opcode].mask;
588 ack->offset = pkt->offset;
589 ack->paylen = paylen;
590
591 /* fill in bth using the request packet headers */
592 memcpy(ack->hdr, pkt->hdr, pkt->offset + RXE_BTH_BYTES);
593
594 bth_set_opcode(ack, opcode);
595 bth_set_qpn(ack, qp->attr.dest_qp_num);
596 bth_set_pad(ack, pad);
597 bth_set_se(ack, 0);
598 bth_set_psn(ack, psn);
599 bth_set_ack(ack, 0);
600 ack->psn = psn;
601
602 if (ack->mask & RXE_AETH_MASK) {
603 aeth_set_syn(ack, syndrome);
604 aeth_set_msn(ack, qp->resp.msn);
605 }
606
607 if (ack->mask & RXE_ATMACK_MASK)
608 atmack_set_orig(ack, qp->resp.atomic_orig);
609
610 err = rxe_prepare(ack, skb, &crc);
611 if (err) {
612 kfree_skb(skb);
613 return NULL;
614 }
615
616 if (crcp) {
617 /* CRC computation will be continued by the caller */
618 *crcp = crc;
619 } else {
620 p = payload_addr(ack) + payload + bth_pad(ack);
621 *p = ~crc;
622 }
623
624 return skb;
625 }
626
627 /* RDMA read response. If res is not NULL, then we have a current RDMA request
628 * being processed or replayed.
629 */
read_reply(struct rxe_qp * qp,struct rxe_pkt_info * req_pkt)630 static enum resp_states read_reply(struct rxe_qp *qp,
631 struct rxe_pkt_info *req_pkt)
632 {
633 struct rxe_pkt_info ack_pkt;
634 struct sk_buff *skb;
635 int mtu = qp->mtu;
636 enum resp_states state;
637 int payload;
638 int opcode;
639 int err;
640 struct resp_res *res = qp->resp.res;
641 u32 icrc;
642 u32 *p;
643
644 if (!res) {
645 /* This is the first time we process that request. Get a
646 * resource
647 */
648 res = &qp->resp.resources[qp->resp.res_head];
649
650 free_rd_atomic_resource(qp, res);
651 rxe_advance_resp_resource(qp);
652
653 res->type = RXE_READ_MASK;
654 res->replay = 0;
655
656 res->read.va = qp->resp.va;
657 res->read.va_org = qp->resp.va;
658
659 res->first_psn = req_pkt->psn;
660
661 if (reth_len(req_pkt)) {
662 res->last_psn = (req_pkt->psn +
663 (reth_len(req_pkt) + mtu - 1) /
664 mtu - 1) & BTH_PSN_MASK;
665 } else {
666 res->last_psn = res->first_psn;
667 }
668 res->cur_psn = req_pkt->psn;
669
670 res->read.resid = qp->resp.resid;
671 res->read.length = qp->resp.resid;
672 res->read.rkey = qp->resp.rkey;
673
674 /* note res inherits the reference to mr from qp */
675 res->read.mr = qp->resp.mr;
676 qp->resp.mr = NULL;
677
678 qp->resp.res = res;
679 res->state = rdatm_res_state_new;
680 }
681
682 if (res->state == rdatm_res_state_new) {
683 if (res->read.resid <= mtu)
684 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_ONLY;
685 else
686 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST;
687 } else {
688 if (res->read.resid > mtu)
689 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE;
690 else
691 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_LAST;
692 }
693
694 res->state = rdatm_res_state_next;
695
696 payload = min_t(int, res->read.resid, mtu);
697
698 skb = prepare_ack_packet(qp, req_pkt, &ack_pkt, opcode, payload,
699 res->cur_psn, AETH_ACK_UNLIMITED, &icrc);
700 if (!skb)
701 return RESPST_ERR_RNR;
702
703 err = rxe_mem_copy(res->read.mr, res->read.va, payload_addr(&ack_pkt),
704 payload, from_mem_obj, &icrc);
705 if (err)
706 pr_err("Failed copying memory\n");
707
708 if (bth_pad(&ack_pkt)) {
709 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
710 u8 *pad = payload_addr(&ack_pkt) + payload;
711
712 memset(pad, 0, bth_pad(&ack_pkt));
713 icrc = rxe_crc32(rxe, icrc, pad, bth_pad(&ack_pkt));
714 }
715 p = payload_addr(&ack_pkt) + payload + bth_pad(&ack_pkt);
716 *p = ~icrc;
717
718 err = rxe_xmit_packet(qp, &ack_pkt, skb);
719 if (err) {
720 pr_err("Failed sending RDMA reply.\n");
721 return RESPST_ERR_RNR;
722 }
723
724 res->read.va += payload;
725 res->read.resid -= payload;
726 res->cur_psn = (res->cur_psn + 1) & BTH_PSN_MASK;
727
728 if (res->read.resid > 0) {
729 state = RESPST_DONE;
730 } else {
731 qp->resp.res = NULL;
732 if (!res->replay)
733 qp->resp.opcode = -1;
734 if (psn_compare(res->cur_psn, qp->resp.psn) >= 0)
735 qp->resp.psn = res->cur_psn;
736 state = RESPST_CLEANUP;
737 }
738
739 return state;
740 }
741
build_rdma_network_hdr(union rdma_network_hdr * hdr,struct rxe_pkt_info * pkt)742 static void build_rdma_network_hdr(union rdma_network_hdr *hdr,
743 struct rxe_pkt_info *pkt)
744 {
745 struct sk_buff *skb = PKT_TO_SKB(pkt);
746
747 memset(hdr, 0, sizeof(*hdr));
748 if (skb->protocol == htons(ETH_P_IP))
749 memcpy(&hdr->roce4grh, ip_hdr(skb), sizeof(hdr->roce4grh));
750 else if (skb->protocol == htons(ETH_P_IPV6))
751 memcpy(&hdr->ibgrh, ipv6_hdr(skb), sizeof(hdr->ibgrh));
752 }
753
754 /* Executes a new request. A retried request never reach that function (send
755 * and writes are discarded, and reads and atomics are retried elsewhere.
756 */
execute(struct rxe_qp * qp,struct rxe_pkt_info * pkt)757 static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt)
758 {
759 enum resp_states err;
760
761 if (pkt->mask & RXE_SEND_MASK) {
762 if (qp_type(qp) == IB_QPT_UD ||
763 qp_type(qp) == IB_QPT_SMI ||
764 qp_type(qp) == IB_QPT_GSI) {
765 union rdma_network_hdr hdr;
766
767 build_rdma_network_hdr(&hdr, pkt);
768
769 err = send_data_in(qp, &hdr, sizeof(hdr));
770 if (err)
771 return err;
772 }
773 err = send_data_in(qp, payload_addr(pkt), payload_size(pkt));
774 if (err)
775 return err;
776 } else if (pkt->mask & RXE_WRITE_MASK) {
777 err = write_data_in(qp, pkt);
778 if (err)
779 return err;
780 } else if (pkt->mask & RXE_READ_MASK) {
781 /* For RDMA Read we can increment the msn now. See C9-148. */
782 qp->resp.msn++;
783 return RESPST_READ_REPLY;
784 } else if (pkt->mask & RXE_ATOMIC_MASK) {
785 err = process_atomic(qp, pkt);
786 if (err)
787 return err;
788 } else {
789 /* Unreachable */
790 WARN_ON_ONCE(1);
791 }
792
793 /* next expected psn, read handles this separately */
794 qp->resp.psn = (pkt->psn + 1) & BTH_PSN_MASK;
795 qp->resp.ack_psn = qp->resp.psn;
796
797 qp->resp.opcode = pkt->opcode;
798 qp->resp.status = IB_WC_SUCCESS;
799
800 if (pkt->mask & RXE_COMP_MASK) {
801 /* We successfully processed this new request. */
802 qp->resp.msn++;
803 return RESPST_COMPLETE;
804 } else if (qp_type(qp) == IB_QPT_RC)
805 return RESPST_ACKNOWLEDGE;
806 else
807 return RESPST_CLEANUP;
808 }
809
do_complete(struct rxe_qp * qp,struct rxe_pkt_info * pkt)810 static enum resp_states do_complete(struct rxe_qp *qp,
811 struct rxe_pkt_info *pkt)
812 {
813 struct rxe_cqe cqe;
814 struct ib_wc *wc = &cqe.ibwc;
815 struct ib_uverbs_wc *uwc = &cqe.uibwc;
816 struct rxe_recv_wqe *wqe = qp->resp.wqe;
817 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
818
819 if (unlikely(!wqe))
820 return RESPST_CLEANUP;
821
822 memset(&cqe, 0, sizeof(cqe));
823
824 if (qp->rcq->is_user) {
825 uwc->status = qp->resp.status;
826 uwc->qp_num = qp->ibqp.qp_num;
827 uwc->wr_id = wqe->wr_id;
828 } else {
829 wc->status = qp->resp.status;
830 wc->qp = &qp->ibqp;
831 wc->wr_id = wqe->wr_id;
832 }
833
834 if (wc->status == IB_WC_SUCCESS) {
835 rxe_counter_inc(rxe, RXE_CNT_RDMA_RECV);
836 wc->opcode = (pkt->mask & RXE_IMMDT_MASK &&
837 pkt->mask & RXE_WRITE_MASK) ?
838 IB_WC_RECV_RDMA_WITH_IMM : IB_WC_RECV;
839 wc->vendor_err = 0;
840 wc->byte_len = (pkt->mask & RXE_IMMDT_MASK &&
841 pkt->mask & RXE_WRITE_MASK) ?
842 qp->resp.length : 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 = immdt_imm(pkt);
853 }
854
855 if (pkt->mask & RXE_IETH_MASK) {
856 uwc->wc_flags |= IB_WC_WITH_INVALIDATE;
857 uwc->ex.invalidate_rkey = ieth_rkey(pkt);
858 }
859
860 uwc->qp_num = qp->ibqp.qp_num;
861
862 if (pkt->mask & RXE_DETH_MASK)
863 uwc->src_qp = deth_sqp(pkt);
864
865 uwc->port_num = qp->attr.port_num;
866 } else {
867 struct sk_buff *skb = PKT_TO_SKB(pkt);
868
869 wc->wc_flags = IB_WC_GRH | IB_WC_WITH_NETWORK_HDR_TYPE;
870 if (skb->protocol == htons(ETH_P_IP))
871 wc->network_hdr_type = RDMA_NETWORK_IPV4;
872 else
873 wc->network_hdr_type = RDMA_NETWORK_IPV6;
874
875 if (is_vlan_dev(skb->dev)) {
876 wc->wc_flags |= IB_WC_WITH_VLAN;
877 wc->vlan_id = vlan_dev_vlan_id(skb->dev);
878 }
879
880 if (pkt->mask & RXE_IMMDT_MASK) {
881 wc->wc_flags |= IB_WC_WITH_IMM;
882 wc->ex.imm_data = immdt_imm(pkt);
883 }
884
885 if (pkt->mask & RXE_IETH_MASK) {
886 struct rxe_mem *rmr;
887
888 wc->wc_flags |= IB_WC_WITH_INVALIDATE;
889 wc->ex.invalidate_rkey = ieth_rkey(pkt);
890
891 rmr = rxe_pool_get_index(&rxe->mr_pool,
892 wc->ex.invalidate_rkey >> 8);
893 if (unlikely(!rmr)) {
894 pr_err("Bad rkey %#x invalidation\n",
895 wc->ex.invalidate_rkey);
896 return RESPST_ERROR;
897 }
898 rmr->state = RXE_MEM_STATE_FREE;
899 rxe_drop_ref(rmr);
900 }
901
902 wc->qp = &qp->ibqp;
903
904 if (pkt->mask & RXE_DETH_MASK)
905 wc->src_qp = deth_sqp(pkt);
906
907 wc->port_num = qp->attr.port_num;
908 }
909 }
910
911 /* have copy for srq and reference for !srq */
912 if (!qp->srq)
913 advance_consumer(qp->rq.queue);
914
915 qp->resp.wqe = NULL;
916
917 if (rxe_cq_post(qp->rcq, &cqe, pkt ? bth_se(pkt) : 1))
918 return RESPST_ERR_CQ_OVERFLOW;
919
920 if (qp->resp.state == QP_STATE_ERROR)
921 return RESPST_CHK_RESOURCE;
922
923 if (!pkt)
924 return RESPST_DONE;
925 else if (qp_type(qp) == IB_QPT_RC)
926 return RESPST_ACKNOWLEDGE;
927 else
928 return RESPST_CLEANUP;
929 }
930
send_ack(struct rxe_qp * qp,struct rxe_pkt_info * pkt,u8 syndrome,u32 psn)931 static int send_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
932 u8 syndrome, u32 psn)
933 {
934 int err = 0;
935 struct rxe_pkt_info ack_pkt;
936 struct sk_buff *skb;
937
938 skb = prepare_ack_packet(qp, pkt, &ack_pkt, IB_OPCODE_RC_ACKNOWLEDGE,
939 0, psn, syndrome, NULL);
940 if (!skb) {
941 err = -ENOMEM;
942 goto err1;
943 }
944
945 err = rxe_xmit_packet(qp, &ack_pkt, skb);
946 if (err)
947 pr_err_ratelimited("Failed sending ack\n");
948
949 err1:
950 return err;
951 }
952
send_atomic_ack(struct rxe_qp * qp,struct rxe_pkt_info * pkt,u8 syndrome)953 static int send_atomic_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
954 u8 syndrome)
955 {
956 int rc = 0;
957 struct rxe_pkt_info ack_pkt;
958 struct sk_buff *skb;
959 struct resp_res *res;
960
961 skb = prepare_ack_packet(qp, pkt, &ack_pkt,
962 IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE, 0, pkt->psn,
963 syndrome, NULL);
964 if (!skb) {
965 rc = -ENOMEM;
966 goto out;
967 }
968
969 res = &qp->resp.resources[qp->resp.res_head];
970 free_rd_atomic_resource(qp, res);
971 rxe_advance_resp_resource(qp);
972
973 memcpy(SKB_TO_PKT(skb), &ack_pkt, sizeof(ack_pkt));
974 memset((unsigned char *)SKB_TO_PKT(skb) + sizeof(ack_pkt), 0,
975 sizeof(skb->cb) - sizeof(ack_pkt));
976
977 skb_get(skb);
978 res->type = RXE_ATOMIC_MASK;
979 res->atomic.skb = skb;
980 res->first_psn = ack_pkt.psn;
981 res->last_psn = ack_pkt.psn;
982 res->cur_psn = ack_pkt.psn;
983
984 rc = rxe_xmit_packet(qp, &ack_pkt, skb);
985 if (rc) {
986 pr_err_ratelimited("Failed sending ack\n");
987 rxe_drop_ref(qp);
988 }
989 out:
990 return rc;
991 }
992
acknowledge(struct rxe_qp * qp,struct rxe_pkt_info * pkt)993 static enum resp_states acknowledge(struct rxe_qp *qp,
994 struct rxe_pkt_info *pkt)
995 {
996 if (qp_type(qp) != IB_QPT_RC)
997 return RESPST_CLEANUP;
998
999 if (qp->resp.aeth_syndrome != AETH_ACK_UNLIMITED)
1000 send_ack(qp, pkt, qp->resp.aeth_syndrome, pkt->psn);
1001 else if (pkt->mask & RXE_ATOMIC_MASK)
1002 send_atomic_ack(qp, pkt, AETH_ACK_UNLIMITED);
1003 else if (bth_ack(pkt))
1004 send_ack(qp, pkt, AETH_ACK_UNLIMITED, pkt->psn);
1005
1006 return RESPST_CLEANUP;
1007 }
1008
cleanup(struct rxe_qp * qp,struct rxe_pkt_info * pkt)1009 static enum resp_states cleanup(struct rxe_qp *qp,
1010 struct rxe_pkt_info *pkt)
1011 {
1012 struct sk_buff *skb;
1013
1014 if (pkt) {
1015 skb = skb_dequeue(&qp->req_pkts);
1016 rxe_drop_ref(qp);
1017 kfree_skb(skb);
1018 }
1019
1020 if (qp->resp.mr) {
1021 rxe_drop_ref(qp->resp.mr);
1022 qp->resp.mr = NULL;
1023 }
1024
1025 return RESPST_DONE;
1026 }
1027
find_resource(struct rxe_qp * qp,u32 psn)1028 static struct resp_res *find_resource(struct rxe_qp *qp, u32 psn)
1029 {
1030 int i;
1031
1032 for (i = 0; i < qp->attr.max_dest_rd_atomic; i++) {
1033 struct resp_res *res = &qp->resp.resources[i];
1034
1035 if (res->type == 0)
1036 continue;
1037
1038 if (psn_compare(psn, res->first_psn) >= 0 &&
1039 psn_compare(psn, res->last_psn) <= 0) {
1040 return res;
1041 }
1042 }
1043
1044 return NULL;
1045 }
1046
duplicate_request(struct rxe_qp * qp,struct rxe_pkt_info * pkt)1047 static enum resp_states duplicate_request(struct rxe_qp *qp,
1048 struct rxe_pkt_info *pkt)
1049 {
1050 enum resp_states rc;
1051 u32 prev_psn = (qp->resp.ack_psn - 1) & BTH_PSN_MASK;
1052
1053 if (pkt->mask & RXE_SEND_MASK ||
1054 pkt->mask & RXE_WRITE_MASK) {
1055 /* SEND. Ack again and cleanup. C9-105. */
1056 if (bth_ack(pkt))
1057 send_ack(qp, pkt, AETH_ACK_UNLIMITED, prev_psn);
1058 rc = RESPST_CLEANUP;
1059 goto out;
1060 } else if (pkt->mask & RXE_READ_MASK) {
1061 struct resp_res *res;
1062
1063 res = find_resource(qp, pkt->psn);
1064 if (!res) {
1065 /* Resource not found. Class D error. Drop the
1066 * request.
1067 */
1068 rc = RESPST_CLEANUP;
1069 goto out;
1070 } else {
1071 /* Ensure this new request is the same as the previous
1072 * one or a subset of it.
1073 */
1074 u64 iova = reth_va(pkt);
1075 u32 resid = reth_len(pkt);
1076
1077 if (iova < res->read.va_org ||
1078 resid > res->read.length ||
1079 (iova + resid) > (res->read.va_org +
1080 res->read.length)) {
1081 rc = RESPST_CLEANUP;
1082 goto out;
1083 }
1084
1085 if (reth_rkey(pkt) != res->read.rkey) {
1086 rc = RESPST_CLEANUP;
1087 goto out;
1088 }
1089
1090 res->cur_psn = pkt->psn;
1091 res->state = (pkt->psn == res->first_psn) ?
1092 rdatm_res_state_new :
1093 rdatm_res_state_replay;
1094 res->replay = 1;
1095
1096 /* Reset the resource, except length. */
1097 res->read.va_org = iova;
1098 res->read.va = iova;
1099 res->read.resid = resid;
1100
1101 /* Replay the RDMA read reply. */
1102 qp->resp.res = res;
1103 rc = RESPST_READ_REPLY;
1104 goto out;
1105 }
1106 } else {
1107 struct resp_res *res;
1108
1109 /* Find the operation in our list of responder resources. */
1110 res = find_resource(qp, pkt->psn);
1111 if (res) {
1112 skb_get(res->atomic.skb);
1113 /* Resend the result. */
1114 rc = rxe_xmit_packet(qp, pkt, res->atomic.skb);
1115 if (rc) {
1116 pr_err("Failed resending result. This flow is not handled - skb ignored\n");
1117 rc = RESPST_CLEANUP;
1118 goto out;
1119 }
1120 }
1121
1122 /* Resource not found. Class D error. Drop the request. */
1123 rc = RESPST_CLEANUP;
1124 goto out;
1125 }
1126 out:
1127 return rc;
1128 }
1129
1130 /* Process a class A or C. Both are treated the same in this implementation. */
do_class_ac_error(struct rxe_qp * qp,u8 syndrome,enum ib_wc_status status)1131 static void do_class_ac_error(struct rxe_qp *qp, u8 syndrome,
1132 enum ib_wc_status status)
1133 {
1134 qp->resp.aeth_syndrome = syndrome;
1135 qp->resp.status = status;
1136
1137 /* indicate that we should go through the ERROR state */
1138 qp->resp.goto_error = 1;
1139 }
1140
do_class_d1e_error(struct rxe_qp * qp)1141 static enum resp_states do_class_d1e_error(struct rxe_qp *qp)
1142 {
1143 /* UC */
1144 if (qp->srq) {
1145 /* Class E */
1146 qp->resp.drop_msg = 1;
1147 if (qp->resp.wqe) {
1148 qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1149 return RESPST_COMPLETE;
1150 } else {
1151 return RESPST_CLEANUP;
1152 }
1153 } else {
1154 /* Class D1. This packet may be the start of a
1155 * new message and could be valid. The previous
1156 * message is invalid and ignored. reset the
1157 * recv wr to its original state
1158 */
1159 if (qp->resp.wqe) {
1160 qp->resp.wqe->dma.resid = qp->resp.wqe->dma.length;
1161 qp->resp.wqe->dma.cur_sge = 0;
1162 qp->resp.wqe->dma.sge_offset = 0;
1163 qp->resp.opcode = -1;
1164 }
1165
1166 if (qp->resp.mr) {
1167 rxe_drop_ref(qp->resp.mr);
1168 qp->resp.mr = NULL;
1169 }
1170
1171 return RESPST_CLEANUP;
1172 }
1173 }
1174
rxe_drain_req_pkts(struct rxe_qp * qp,bool notify)1175 static void rxe_drain_req_pkts(struct rxe_qp *qp, bool notify)
1176 {
1177 struct sk_buff *skb;
1178
1179 while ((skb = skb_dequeue(&qp->req_pkts))) {
1180 rxe_drop_ref(qp);
1181 kfree_skb(skb);
1182 }
1183
1184 if (notify)
1185 return;
1186
1187 while (!qp->srq && qp->rq.queue && queue_head(qp->rq.queue))
1188 advance_consumer(qp->rq.queue);
1189 }
1190
rxe_responder(void * arg)1191 int rxe_responder(void *arg)
1192 {
1193 struct rxe_qp *qp = (struct rxe_qp *)arg;
1194 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
1195 enum resp_states state;
1196 struct rxe_pkt_info *pkt = NULL;
1197 int ret = 0;
1198
1199 rxe_add_ref(qp);
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) {
1219 pr_debug("qp#%d state = %s\n", qp_num(qp),
1220 resp_state_name[state]);
1221 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 rxe_counter_inc(rxe, RXE_CNT_SND_RNR);
1284 /* RC - class B */
1285 send_ack(qp, pkt, AETH_RNR_NAK |
1286 (~AETH_TYPE_MASK &
1287 qp->attr.min_rnr_timer),
1288 pkt->psn);
1289 } else {
1290 /* UD/UC - class D */
1291 qp->resp.drop_msg = 1;
1292 }
1293 state = RESPST_CLEANUP;
1294 break;
1295
1296 case RESPST_ERR_RKEY_VIOLATION:
1297 if (qp_type(qp) == IB_QPT_RC) {
1298 /* Class C */
1299 do_class_ac_error(qp, AETH_NAK_REM_ACC_ERR,
1300 IB_WC_REM_ACCESS_ERR);
1301 state = RESPST_COMPLETE;
1302 } else {
1303 qp->resp.drop_msg = 1;
1304 if (qp->srq) {
1305 /* UC/SRQ Class D */
1306 qp->resp.status = IB_WC_REM_ACCESS_ERR;
1307 state = RESPST_COMPLETE;
1308 } else {
1309 /* UC/non-SRQ Class E. */
1310 state = RESPST_CLEANUP;
1311 }
1312 }
1313 break;
1314
1315 case RESPST_ERR_LENGTH:
1316 if (qp_type(qp) == IB_QPT_RC) {
1317 /* Class C */
1318 do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1319 IB_WC_REM_INV_REQ_ERR);
1320 state = RESPST_COMPLETE;
1321 } else if (qp->srq) {
1322 /* UC/UD - class E */
1323 qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1324 state = RESPST_COMPLETE;
1325 } else {
1326 /* UC/UD - class D */
1327 qp->resp.drop_msg = 1;
1328 state = RESPST_CLEANUP;
1329 }
1330 break;
1331
1332 case RESPST_ERR_MALFORMED_WQE:
1333 /* All, Class A. */
1334 do_class_ac_error(qp, AETH_NAK_REM_OP_ERR,
1335 IB_WC_LOC_QP_OP_ERR);
1336 state = RESPST_COMPLETE;
1337 break;
1338
1339 case RESPST_ERR_CQ_OVERFLOW:
1340 /* All - Class G */
1341 state = RESPST_ERROR;
1342 break;
1343
1344 case RESPST_DONE:
1345 if (qp->resp.goto_error) {
1346 state = RESPST_ERROR;
1347 break;
1348 }
1349
1350 goto done;
1351
1352 case RESPST_EXIT:
1353 if (qp->resp.goto_error) {
1354 state = RESPST_ERROR;
1355 break;
1356 }
1357
1358 goto exit;
1359
1360 case RESPST_RESET:
1361 rxe_drain_req_pkts(qp, false);
1362 qp->resp.wqe = NULL;
1363 goto exit;
1364
1365 case RESPST_ERROR:
1366 qp->resp.goto_error = 0;
1367 pr_warn("qp#%d moved to error state\n", qp_num(qp));
1368 rxe_qp_error(qp);
1369 goto exit;
1370
1371 default:
1372 WARN_ON_ONCE(1);
1373 }
1374 }
1375
1376 exit:
1377 ret = -EAGAIN;
1378 done:
1379 rxe_drop_ref(qp);
1380 return ret;
1381 }
1382