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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
107void rxe_resp_queue_pkt(struct rxe_qp *qp, struct sk_buff *skb)
108{
109 int must_sched;
110 struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
111
112 skb_queue_tail(&qp->req_pkts, skb);
113
114 must_sched = (pkt->opcode == IB_OPCODE_RC_RDMA_READ_REQUEST) ||
115 (skb_queue_len(&qp->req_pkts) > 1);
116
117 rxe_run_task(&qp->resp.task, must_sched);
118}
119
120static inline enum resp_states get_req(struct rxe_qp *qp,
121 struct rxe_pkt_info **pkt_p)
122{
123 struct sk_buff *skb;
124
125 if (qp->resp.state == QP_STATE_ERROR) {
126 while ((skb = skb_dequeue(&qp->req_pkts))) {
127 rxe_drop_ref(qp);
128 kfree_skb(skb);
129 }
130
131
132 return RESPST_CHK_RESOURCE;
133 }
134
135 skb = skb_peek(&qp->req_pkts);
136 if (!skb)
137 return RESPST_EXIT;
138
139 *pkt_p = SKB_TO_PKT(skb);
140
141 return (qp->resp.res) ? RESPST_READ_REPLY : RESPST_CHK_PSN;
142}
143
144static enum resp_states check_psn(struct rxe_qp *qp,
145 struct rxe_pkt_info *pkt)
146{
147 int diff = psn_compare(pkt->psn, qp->resp.psn);
148 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
149
150 switch (qp_type(qp)) {
151 case IB_QPT_RC:
152 if (diff > 0) {
153 if (qp->resp.sent_psn_nak)
154 return RESPST_CLEANUP;
155
156 qp->resp.sent_psn_nak = 1;
157 rxe_counter_inc(rxe, RXE_CNT_OUT_OF_SEQ_REQ);
158 return RESPST_ERR_PSN_OUT_OF_SEQ;
159
160 } else if (diff < 0) {
161 rxe_counter_inc(rxe, RXE_CNT_DUP_REQ);
162 return RESPST_DUPLICATE_REQUEST;
163 }
164
165 if (qp->resp.sent_psn_nak)
166 qp->resp.sent_psn_nak = 0;
167
168 break;
169
170 case IB_QPT_UC:
171 if (qp->resp.drop_msg || diff != 0) {
172 if (pkt->mask & RXE_START_MASK) {
173 qp->resp.drop_msg = 0;
174 return RESPST_CHK_OP_SEQ;
175 }
176
177 qp->resp.drop_msg = 1;
178 return RESPST_CLEANUP;
179 }
180 break;
181 default:
182 break;
183 }
184
185 return RESPST_CHK_OP_SEQ;
186}
187
188static enum resp_states check_op_seq(struct rxe_qp *qp,
189 struct rxe_pkt_info *pkt)
190{
191 switch (qp_type(qp)) {
192 case IB_QPT_RC:
193 switch (qp->resp.opcode) {
194 case IB_OPCODE_RC_SEND_FIRST:
195 case IB_OPCODE_RC_SEND_MIDDLE:
196 switch (pkt->opcode) {
197 case IB_OPCODE_RC_SEND_MIDDLE:
198 case IB_OPCODE_RC_SEND_LAST:
199 case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE:
200 case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE:
201 return RESPST_CHK_OP_VALID;
202 default:
203 return RESPST_ERR_MISSING_OPCODE_LAST_C;
204 }
205
206 case IB_OPCODE_RC_RDMA_WRITE_FIRST:
207 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
208 switch (pkt->opcode) {
209 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
210 case IB_OPCODE_RC_RDMA_WRITE_LAST:
211 case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
212 return RESPST_CHK_OP_VALID;
213 default:
214 return RESPST_ERR_MISSING_OPCODE_LAST_C;
215 }
216
217 default:
218 switch (pkt->opcode) {
219 case IB_OPCODE_RC_SEND_MIDDLE:
220 case IB_OPCODE_RC_SEND_LAST:
221 case IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE:
222 case IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE:
223 case IB_OPCODE_RC_RDMA_WRITE_MIDDLE:
224 case IB_OPCODE_RC_RDMA_WRITE_LAST:
225 case IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
226 return RESPST_ERR_MISSING_OPCODE_FIRST;
227 default:
228 return RESPST_CHK_OP_VALID;
229 }
230 }
231 break;
232
233 case IB_QPT_UC:
234 switch (qp->resp.opcode) {
235 case IB_OPCODE_UC_SEND_FIRST:
236 case IB_OPCODE_UC_SEND_MIDDLE:
237 switch (pkt->opcode) {
238 case IB_OPCODE_UC_SEND_MIDDLE:
239 case IB_OPCODE_UC_SEND_LAST:
240 case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE:
241 return RESPST_CHK_OP_VALID;
242 default:
243 return RESPST_ERR_MISSING_OPCODE_LAST_D1E;
244 }
245
246 case IB_OPCODE_UC_RDMA_WRITE_FIRST:
247 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
248 switch (pkt->opcode) {
249 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
250 case IB_OPCODE_UC_RDMA_WRITE_LAST:
251 case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
252 return RESPST_CHK_OP_VALID;
253 default:
254 return RESPST_ERR_MISSING_OPCODE_LAST_D1E;
255 }
256
257 default:
258 switch (pkt->opcode) {
259 case IB_OPCODE_UC_SEND_MIDDLE:
260 case IB_OPCODE_UC_SEND_LAST:
261 case IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE:
262 case IB_OPCODE_UC_RDMA_WRITE_MIDDLE:
263 case IB_OPCODE_UC_RDMA_WRITE_LAST:
264 case IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE:
265 qp->resp.drop_msg = 1;
266 return RESPST_CLEANUP;
267 default:
268 return RESPST_CHK_OP_VALID;
269 }
270 }
271 break;
272
273 default:
274 return RESPST_CHK_OP_VALID;
275 }
276}
277
278static enum resp_states check_op_valid(struct rxe_qp *qp,
279 struct rxe_pkt_info *pkt)
280{
281 switch (qp_type(qp)) {
282 case IB_QPT_RC:
283 if (((pkt->mask & RXE_READ_MASK) &&
284 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_READ)) ||
285 ((pkt->mask & RXE_WRITE_MASK) &&
286 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) ||
287 ((pkt->mask & RXE_ATOMIC_MASK) &&
288 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) {
289 return RESPST_ERR_UNSUPPORTED_OPCODE;
290 }
291
292 break;
293
294 case IB_QPT_UC:
295 if ((pkt->mask & RXE_WRITE_MASK) &&
296 !(qp->attr.qp_access_flags & IB_ACCESS_REMOTE_WRITE)) {
297 qp->resp.drop_msg = 1;
298 return RESPST_CLEANUP;
299 }
300
301 break;
302
303 case IB_QPT_UD:
304 case IB_QPT_SMI:
305 case IB_QPT_GSI:
306 break;
307
308 default:
309 WARN_ON_ONCE(1);
310 break;
311 }
312
313 return RESPST_CHK_RESOURCE;
314}
315
316static enum resp_states get_srq_wqe(struct rxe_qp *qp)
317{
318 struct rxe_srq *srq = qp->srq;
319 struct rxe_queue *q = srq->rq.queue;
320 struct rxe_recv_wqe *wqe;
321 struct ib_event ev;
322
323 if (srq->error)
324 return RESPST_ERR_RNR;
325
326 spin_lock_bh(&srq->rq.consumer_lock);
327
328 wqe = queue_head(q);
329 if (!wqe) {
330 spin_unlock_bh(&srq->rq.consumer_lock);
331 return RESPST_ERR_RNR;
332 }
333
334
335 memcpy(&qp->resp.srq_wqe, wqe, sizeof(qp->resp.srq_wqe));
336
337 qp->resp.wqe = &qp->resp.srq_wqe.wqe;
338 advance_consumer(q);
339
340 if (srq->limit && srq->ibsrq.event_handler &&
341 (queue_count(q) < srq->limit)) {
342 srq->limit = 0;
343 goto event;
344 }
345
346 spin_unlock_bh(&srq->rq.consumer_lock);
347 return RESPST_CHK_LENGTH;
348
349event:
350 spin_unlock_bh(&srq->rq.consumer_lock);
351 ev.device = qp->ibqp.device;
352 ev.element.srq = qp->ibqp.srq;
353 ev.event = IB_EVENT_SRQ_LIMIT_REACHED;
354 srq->ibsrq.event_handler(&ev, srq->ibsrq.srq_context);
355 return RESPST_CHK_LENGTH;
356}
357
358static enum resp_states check_resource(struct rxe_qp *qp,
359 struct rxe_pkt_info *pkt)
360{
361 struct rxe_srq *srq = qp->srq;
362
363 if (qp->resp.state == QP_STATE_ERROR) {
364 if (qp->resp.wqe) {
365 qp->resp.status = IB_WC_WR_FLUSH_ERR;
366 return RESPST_COMPLETE;
367 } else if (!srq) {
368 qp->resp.wqe = queue_head(qp->rq.queue);
369 if (qp->resp.wqe) {
370 qp->resp.status = IB_WC_WR_FLUSH_ERR;
371 return RESPST_COMPLETE;
372 } else {
373 return RESPST_EXIT;
374 }
375 } else {
376 return RESPST_EXIT;
377 }
378 }
379
380 if (pkt->mask & RXE_READ_OR_ATOMIC) {
381
382
383
384
385 if (likely(qp->attr.max_dest_rd_atomic > 0))
386 return RESPST_CHK_LENGTH;
387 else
388 return RESPST_ERR_TOO_MANY_RDMA_ATM_REQ;
389 }
390
391 if (pkt->mask & RXE_RWR_MASK) {
392 if (srq)
393 return get_srq_wqe(qp);
394
395 qp->resp.wqe = queue_head(qp->rq.queue);
396 return (qp->resp.wqe) ? RESPST_CHK_LENGTH : RESPST_ERR_RNR;
397 }
398
399 return RESPST_CHK_LENGTH;
400}
401
402static enum resp_states check_length(struct rxe_qp *qp,
403 struct rxe_pkt_info *pkt)
404{
405 switch (qp_type(qp)) {
406 case IB_QPT_RC:
407 return RESPST_CHK_RKEY;
408
409 case IB_QPT_UC:
410 return RESPST_CHK_RKEY;
411
412 default:
413 return RESPST_CHK_RKEY;
414 }
415}
416
417static enum resp_states check_rkey(struct rxe_qp *qp,
418 struct rxe_pkt_info *pkt)
419{
420 struct rxe_mem *mem = NULL;
421 u64 va;
422 u32 rkey;
423 u32 resid;
424 u32 pktlen;
425 int mtu = qp->mtu;
426 enum resp_states state;
427 int access;
428
429 if (pkt->mask & (RXE_READ_MASK | RXE_WRITE_MASK)) {
430 if (pkt->mask & RXE_RETH_MASK) {
431 qp->resp.va = reth_va(pkt);
432 qp->resp.rkey = reth_rkey(pkt);
433 qp->resp.resid = reth_len(pkt);
434 qp->resp.length = reth_len(pkt);
435 }
436 access = (pkt->mask & RXE_READ_MASK) ? IB_ACCESS_REMOTE_READ
437 : IB_ACCESS_REMOTE_WRITE;
438 } else if (pkt->mask & RXE_ATOMIC_MASK) {
439 qp->resp.va = atmeth_va(pkt);
440 qp->resp.rkey = atmeth_rkey(pkt);
441 qp->resp.resid = sizeof(u64);
442 access = IB_ACCESS_REMOTE_ATOMIC;
443 } else {
444 return RESPST_EXECUTE;
445 }
446
447
448 if ((pkt->mask & (RXE_READ_MASK | RXE_WRITE_OR_SEND)) &&
449 (pkt->mask & RXE_RETH_MASK) &&
450 reth_len(pkt) == 0) {
451 return RESPST_EXECUTE;
452 }
453
454 va = qp->resp.va;
455 rkey = qp->resp.rkey;
456 resid = qp->resp.resid;
457 pktlen = payload_size(pkt);
458
459 mem = lookup_mem(qp->pd, access, rkey, lookup_remote);
460 if (!mem) {
461 state = RESPST_ERR_RKEY_VIOLATION;
462 goto err;
463 }
464
465 if (unlikely(mem->state == RXE_MEM_STATE_FREE)) {
466 state = RESPST_ERR_RKEY_VIOLATION;
467 goto err;
468 }
469
470 if (mem_check_range(mem, va, resid)) {
471 state = RESPST_ERR_RKEY_VIOLATION;
472 goto err;
473 }
474
475 if (pkt->mask & RXE_WRITE_MASK) {
476 if (resid > mtu) {
477 if (pktlen != mtu || bth_pad(pkt)) {
478 state = RESPST_ERR_LENGTH;
479 goto err;
480 }
481 } else {
482 if (pktlen != resid) {
483 state = RESPST_ERR_LENGTH;
484 goto err;
485 }
486 if ((bth_pad(pkt) != (0x3 & (-resid)))) {
487
488
489
490 state = RESPST_ERR_LENGTH;
491 goto err;
492 }
493 }
494 }
495
496 WARN_ON_ONCE(qp->resp.mr);
497
498 qp->resp.mr = mem;
499 return RESPST_EXECUTE;
500
501err:
502 if (mem)
503 rxe_drop_ref(mem);
504 return state;
505}
506
507static enum resp_states send_data_in(struct rxe_qp *qp, void *data_addr,
508 int data_len)
509{
510 int err;
511
512 err = copy_data(qp->pd, IB_ACCESS_LOCAL_WRITE, &qp->resp.wqe->dma,
513 data_addr, data_len, to_mem_obj, NULL);
514 if (unlikely(err))
515 return (err == -ENOSPC) ? RESPST_ERR_LENGTH
516 : RESPST_ERR_MALFORMED_WQE;
517
518 return RESPST_NONE;
519}
520
521static enum resp_states write_data_in(struct rxe_qp *qp,
522 struct rxe_pkt_info *pkt)
523{
524 enum resp_states rc = RESPST_NONE;
525 int err;
526 int data_len = payload_size(pkt);
527
528 err = rxe_mem_copy(qp->resp.mr, qp->resp.va, payload_addr(pkt),
529 data_len, to_mem_obj, NULL);
530 if (err) {
531 rc = RESPST_ERR_RKEY_VIOLATION;
532 goto out;
533 }
534
535 qp->resp.va += data_len;
536 qp->resp.resid -= data_len;
537
538out:
539 return rc;
540}
541
542
543static DEFINE_SPINLOCK(atomic_ops_lock);
544
545static enum resp_states process_atomic(struct rxe_qp *qp,
546 struct rxe_pkt_info *pkt)
547{
548 u64 iova = atmeth_va(pkt);
549 u64 *vaddr;
550 enum resp_states ret;
551 struct rxe_mem *mr = qp->resp.mr;
552
553 if (mr->state != RXE_MEM_STATE_VALID) {
554 ret = RESPST_ERR_RKEY_VIOLATION;
555 goto out;
556 }
557
558 vaddr = iova_to_vaddr(mr, iova, sizeof(u64));
559
560
561 if (!vaddr || (uintptr_t)vaddr & 7) {
562 ret = RESPST_ERR_MISALIGNED_ATOMIC;
563 goto out;
564 }
565
566 spin_lock_bh(&atomic_ops_lock);
567
568 qp->resp.atomic_orig = *vaddr;
569
570 if (pkt->opcode == IB_OPCODE_RC_COMPARE_SWAP ||
571 pkt->opcode == IB_OPCODE_RD_COMPARE_SWAP) {
572 if (*vaddr == atmeth_comp(pkt))
573 *vaddr = atmeth_swap_add(pkt);
574 } else {
575 *vaddr += atmeth_swap_add(pkt);
576 }
577
578 spin_unlock_bh(&atomic_ops_lock);
579
580 ret = RESPST_NONE;
581out:
582 return ret;
583}
584
585static struct sk_buff *prepare_ack_packet(struct rxe_qp *qp,
586 struct rxe_pkt_info *pkt,
587 struct rxe_pkt_info *ack,
588 int opcode,
589 int payload,
590 u32 psn,
591 u8 syndrome,
592 u32 *crcp)
593{
594 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
595 struct sk_buff *skb;
596 u32 crc = 0;
597 u32 *p;
598 int paylen;
599 int pad;
600 int err;
601
602
603
604
605 pad = (-payload) & 0x3;
606 paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE;
607
608 skb = rxe_init_packet(rxe, &qp->pri_av, paylen, ack);
609 if (!skb)
610 return NULL;
611
612 ack->qp = qp;
613 ack->opcode = opcode;
614 ack->mask = rxe_opcode[opcode].mask;
615 ack->offset = pkt->offset;
616 ack->paylen = paylen;
617
618
619 memcpy(ack->hdr, pkt->hdr, pkt->offset + RXE_BTH_BYTES);
620
621 bth_set_opcode(ack, opcode);
622 bth_set_qpn(ack, qp->attr.dest_qp_num);
623 bth_set_pad(ack, pad);
624 bth_set_se(ack, 0);
625 bth_set_psn(ack, psn);
626 bth_set_ack(ack, 0);
627 ack->psn = psn;
628
629 if (ack->mask & RXE_AETH_MASK) {
630 aeth_set_syn(ack, syndrome);
631 aeth_set_msn(ack, qp->resp.msn);
632 }
633
634 if (ack->mask & RXE_ATMACK_MASK)
635 atmack_set_orig(ack, qp->resp.atomic_orig);
636
637 err = rxe_prepare(ack, skb, &crc);
638 if (err) {
639 kfree_skb(skb);
640 return NULL;
641 }
642
643 if (crcp) {
644
645 *crcp = crc;
646 } else {
647 p = payload_addr(ack) + payload + bth_pad(ack);
648 *p = ~crc;
649 }
650
651 return skb;
652}
653
654
655
656
657static enum resp_states read_reply(struct rxe_qp *qp,
658 struct rxe_pkt_info *req_pkt)
659{
660 struct rxe_pkt_info ack_pkt;
661 struct sk_buff *skb;
662 int mtu = qp->mtu;
663 enum resp_states state;
664 int payload;
665 int opcode;
666 int err;
667 struct resp_res *res = qp->resp.res;
668 u32 icrc;
669 u32 *p;
670
671 if (!res) {
672
673
674
675 res = &qp->resp.resources[qp->resp.res_head];
676
677 free_rd_atomic_resource(qp, res);
678 rxe_advance_resp_resource(qp);
679
680 res->type = RXE_READ_MASK;
681 res->replay = 0;
682
683 res->read.va = qp->resp.va;
684 res->read.va_org = qp->resp.va;
685
686 res->first_psn = req_pkt->psn;
687
688 if (reth_len(req_pkt)) {
689 res->last_psn = (req_pkt->psn +
690 (reth_len(req_pkt) + mtu - 1) /
691 mtu - 1) & BTH_PSN_MASK;
692 } else {
693 res->last_psn = res->first_psn;
694 }
695 res->cur_psn = req_pkt->psn;
696
697 res->read.resid = qp->resp.resid;
698 res->read.length = qp->resp.resid;
699 res->read.rkey = qp->resp.rkey;
700
701
702 res->read.mr = qp->resp.mr;
703 qp->resp.mr = NULL;
704
705 qp->resp.res = res;
706 res->state = rdatm_res_state_new;
707 }
708
709 if (res->state == rdatm_res_state_new) {
710 if (res->read.resid <= mtu)
711 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_ONLY;
712 else
713 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST;
714 } else {
715 if (res->read.resid > mtu)
716 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE;
717 else
718 opcode = IB_OPCODE_RC_RDMA_READ_RESPONSE_LAST;
719 }
720
721 res->state = rdatm_res_state_next;
722
723 payload = min_t(int, res->read.resid, mtu);
724
725 skb = prepare_ack_packet(qp, req_pkt, &ack_pkt, opcode, payload,
726 res->cur_psn, AETH_ACK_UNLIMITED, &icrc);
727 if (!skb)
728 return RESPST_ERR_RNR;
729
730 err = rxe_mem_copy(res->read.mr, res->read.va, payload_addr(&ack_pkt),
731 payload, from_mem_obj, &icrc);
732 if (err)
733 pr_err("Failed copying memory\n");
734
735 p = payload_addr(&ack_pkt) + payload + bth_pad(&ack_pkt);
736 *p = ~icrc;
737
738 err = rxe_xmit_packet(qp, &ack_pkt, skb);
739 if (err) {
740 pr_err("Failed sending RDMA reply.\n");
741 return RESPST_ERR_RNR;
742 }
743
744 res->read.va += payload;
745 res->read.resid -= payload;
746 res->cur_psn = (res->cur_psn + 1) & BTH_PSN_MASK;
747
748 if (res->read.resid > 0) {
749 state = RESPST_DONE;
750 } else {
751 qp->resp.res = NULL;
752 if (!res->replay)
753 qp->resp.opcode = -1;
754 if (psn_compare(res->cur_psn, qp->resp.psn) >= 0)
755 qp->resp.psn = res->cur_psn;
756 state = RESPST_CLEANUP;
757 }
758
759 return state;
760}
761
762static void build_rdma_network_hdr(union rdma_network_hdr *hdr,
763 struct rxe_pkt_info *pkt)
764{
765 struct sk_buff *skb = PKT_TO_SKB(pkt);
766
767 memset(hdr, 0, sizeof(*hdr));
768 if (skb->protocol == htons(ETH_P_IP))
769 memcpy(&hdr->roce4grh, ip_hdr(skb), sizeof(hdr->roce4grh));
770 else if (skb->protocol == htons(ETH_P_IPV6))
771 memcpy(&hdr->ibgrh, ipv6_hdr(skb), sizeof(hdr->ibgrh));
772}
773
774
775
776
777static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt)
778{
779 enum resp_states err;
780
781 if (pkt->mask & RXE_SEND_MASK) {
782 if (qp_type(qp) == IB_QPT_UD ||
783 qp_type(qp) == IB_QPT_SMI ||
784 qp_type(qp) == IB_QPT_GSI) {
785 union rdma_network_hdr hdr;
786
787 build_rdma_network_hdr(&hdr, pkt);
788
789 err = send_data_in(qp, &hdr, sizeof(hdr));
790 if (err)
791 return err;
792 }
793 err = send_data_in(qp, payload_addr(pkt), payload_size(pkt));
794 if (err)
795 return err;
796 } else if (pkt->mask & RXE_WRITE_MASK) {
797 err = write_data_in(qp, pkt);
798 if (err)
799 return err;
800 } else if (pkt->mask & RXE_READ_MASK) {
801
802 qp->resp.msn++;
803 return RESPST_READ_REPLY;
804 } else if (pkt->mask & RXE_ATOMIC_MASK) {
805 err = process_atomic(qp, pkt);
806 if (err)
807 return err;
808 } else {
809
810 WARN_ON_ONCE(1);
811 }
812
813
814 qp->resp.psn = (pkt->psn + 1) & BTH_PSN_MASK;
815 qp->resp.ack_psn = qp->resp.psn;
816
817 qp->resp.opcode = pkt->opcode;
818 qp->resp.status = IB_WC_SUCCESS;
819
820 if (pkt->mask & RXE_COMP_MASK) {
821
822 qp->resp.msn++;
823 return RESPST_COMPLETE;
824 } else if (qp_type(qp) == IB_QPT_RC)
825 return RESPST_ACKNOWLEDGE;
826 else
827 return RESPST_CLEANUP;
828}
829
830static enum resp_states do_complete(struct rxe_qp *qp,
831 struct rxe_pkt_info *pkt)
832{
833 struct rxe_cqe cqe;
834 struct ib_wc *wc = &cqe.ibwc;
835 struct ib_uverbs_wc *uwc = &cqe.uibwc;
836 struct rxe_recv_wqe *wqe = qp->resp.wqe;
837 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
838
839 if (unlikely(!wqe))
840 return RESPST_CLEANUP;
841
842 memset(&cqe, 0, sizeof(cqe));
843
844 if (qp->rcq->is_user) {
845 uwc->status = qp->resp.status;
846 uwc->qp_num = qp->ibqp.qp_num;
847 uwc->wr_id = wqe->wr_id;
848 } else {
849 wc->status = qp->resp.status;
850 wc->qp = &qp->ibqp;
851 wc->wr_id = wqe->wr_id;
852 }
853
854 if (wc->status == IB_WC_SUCCESS) {
855 rxe_counter_inc(rxe, RXE_CNT_RDMA_RECV);
856 wc->opcode = (pkt->mask & RXE_IMMDT_MASK &&
857 pkt->mask & RXE_WRITE_MASK) ?
858 IB_WC_RECV_RDMA_WITH_IMM : IB_WC_RECV;
859 wc->vendor_err = 0;
860 wc->byte_len = (pkt->mask & RXE_IMMDT_MASK &&
861 pkt->mask & RXE_WRITE_MASK) ?
862 qp->resp.length : wqe->dma.length - wqe->dma.resid;
863
864
865
866
867 if (qp->rcq->is_user) {
868 uwc->wc_flags = IB_WC_GRH;
869
870 if (pkt->mask & RXE_IMMDT_MASK) {
871 uwc->wc_flags |= IB_WC_WITH_IMM;
872 uwc->ex.imm_data = immdt_imm(pkt);
873 }
874
875 if (pkt->mask & RXE_IETH_MASK) {
876 uwc->wc_flags |= IB_WC_WITH_INVALIDATE;
877 uwc->ex.invalidate_rkey = ieth_rkey(pkt);
878 }
879
880 uwc->qp_num = qp->ibqp.qp_num;
881
882 if (pkt->mask & RXE_DETH_MASK)
883 uwc->src_qp = deth_sqp(pkt);
884
885 uwc->port_num = qp->attr.port_num;
886 } else {
887 struct sk_buff *skb = PKT_TO_SKB(pkt);
888
889 wc->wc_flags = IB_WC_GRH | IB_WC_WITH_NETWORK_HDR_TYPE;
890 if (skb->protocol == htons(ETH_P_IP))
891 wc->network_hdr_type = RDMA_NETWORK_IPV4;
892 else
893 wc->network_hdr_type = RDMA_NETWORK_IPV6;
894
895 if (is_vlan_dev(skb->dev)) {
896 wc->wc_flags |= IB_WC_WITH_VLAN;
897 wc->vlan_id = vlan_dev_vlan_id(skb->dev);
898 }
899
900 if (pkt->mask & RXE_IMMDT_MASK) {
901 wc->wc_flags |= IB_WC_WITH_IMM;
902 wc->ex.imm_data = immdt_imm(pkt);
903 }
904
905 if (pkt->mask & RXE_IETH_MASK) {
906 struct rxe_mem *rmr;
907
908 wc->wc_flags |= IB_WC_WITH_INVALIDATE;
909 wc->ex.invalidate_rkey = ieth_rkey(pkt);
910
911 rmr = rxe_pool_get_index(&rxe->mr_pool,
912 wc->ex.invalidate_rkey >> 8);
913 if (unlikely(!rmr)) {
914 pr_err("Bad rkey %#x invalidation\n",
915 wc->ex.invalidate_rkey);
916 return RESPST_ERROR;
917 }
918 rmr->state = RXE_MEM_STATE_FREE;
919 rxe_drop_ref(rmr);
920 }
921
922 wc->qp = &qp->ibqp;
923
924 if (pkt->mask & RXE_DETH_MASK)
925 wc->src_qp = deth_sqp(pkt);
926
927 wc->port_num = qp->attr.port_num;
928 }
929 }
930
931
932 if (!qp->srq)
933 advance_consumer(qp->rq.queue);
934
935 qp->resp.wqe = NULL;
936
937 if (rxe_cq_post(qp->rcq, &cqe, pkt ? bth_se(pkt) : 1))
938 return RESPST_ERR_CQ_OVERFLOW;
939
940 if (qp->resp.state == QP_STATE_ERROR)
941 return RESPST_CHK_RESOURCE;
942
943 if (!pkt)
944 return RESPST_DONE;
945 else if (qp_type(qp) == IB_QPT_RC)
946 return RESPST_ACKNOWLEDGE;
947 else
948 return RESPST_CLEANUP;
949}
950
951static int send_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
952 u8 syndrome, u32 psn)
953{
954 int err = 0;
955 struct rxe_pkt_info ack_pkt;
956 struct sk_buff *skb;
957
958 skb = prepare_ack_packet(qp, pkt, &ack_pkt, IB_OPCODE_RC_ACKNOWLEDGE,
959 0, psn, syndrome, NULL);
960 if (!skb) {
961 err = -ENOMEM;
962 goto err1;
963 }
964
965 err = rxe_xmit_packet(qp, &ack_pkt, skb);
966 if (err)
967 pr_err_ratelimited("Failed sending ack\n");
968
969err1:
970 return err;
971}
972
973static int send_atomic_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
974 u8 syndrome)
975{
976 int rc = 0;
977 struct rxe_pkt_info ack_pkt;
978 struct sk_buff *skb;
979 struct resp_res *res;
980
981 skb = prepare_ack_packet(qp, pkt, &ack_pkt,
982 IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE, 0, pkt->psn,
983 syndrome, NULL);
984 if (!skb) {
985 rc = -ENOMEM;
986 goto out;
987 }
988
989 rxe_add_ref(qp);
990
991 res = &qp->resp.resources[qp->resp.res_head];
992 free_rd_atomic_resource(qp, res);
993 rxe_advance_resp_resource(qp);
994
995 memcpy(SKB_TO_PKT(skb), &ack_pkt, sizeof(ack_pkt));
996 memset((unsigned char *)SKB_TO_PKT(skb) + sizeof(ack_pkt), 0,
997 sizeof(skb->cb) - sizeof(ack_pkt));
998
999 skb_get(skb);
1000 res->type = RXE_ATOMIC_MASK;
1001 res->atomic.skb = skb;
1002 res->first_psn = ack_pkt.psn;
1003 res->last_psn = ack_pkt.psn;
1004 res->cur_psn = ack_pkt.psn;
1005
1006 rc = rxe_xmit_packet(qp, &ack_pkt, skb);
1007 if (rc) {
1008 pr_err_ratelimited("Failed sending ack\n");
1009 rxe_drop_ref(qp);
1010 }
1011out:
1012 return rc;
1013}
1014
1015static enum resp_states acknowledge(struct rxe_qp *qp,
1016 struct rxe_pkt_info *pkt)
1017{
1018 if (qp_type(qp) != IB_QPT_RC)
1019 return RESPST_CLEANUP;
1020
1021 if (qp->resp.aeth_syndrome != AETH_ACK_UNLIMITED)
1022 send_ack(qp, pkt, qp->resp.aeth_syndrome, pkt->psn);
1023 else if (pkt->mask & RXE_ATOMIC_MASK)
1024 send_atomic_ack(qp, pkt, AETH_ACK_UNLIMITED);
1025 else if (bth_ack(pkt))
1026 send_ack(qp, pkt, AETH_ACK_UNLIMITED, pkt->psn);
1027
1028 return RESPST_CLEANUP;
1029}
1030
1031static enum resp_states cleanup(struct rxe_qp *qp,
1032 struct rxe_pkt_info *pkt)
1033{
1034 struct sk_buff *skb;
1035
1036 if (pkt) {
1037 skb = skb_dequeue(&qp->req_pkts);
1038 rxe_drop_ref(qp);
1039 kfree_skb(skb);
1040 }
1041
1042 if (qp->resp.mr) {
1043 rxe_drop_ref(qp->resp.mr);
1044 qp->resp.mr = NULL;
1045 }
1046
1047 return RESPST_DONE;
1048}
1049
1050static struct resp_res *find_resource(struct rxe_qp *qp, u32 psn)
1051{
1052 int i;
1053
1054 for (i = 0; i < qp->attr.max_dest_rd_atomic; i++) {
1055 struct resp_res *res = &qp->resp.resources[i];
1056
1057 if (res->type == 0)
1058 continue;
1059
1060 if (psn_compare(psn, res->first_psn) >= 0 &&
1061 psn_compare(psn, res->last_psn) <= 0) {
1062 return res;
1063 }
1064 }
1065
1066 return NULL;
1067}
1068
1069static enum resp_states duplicate_request(struct rxe_qp *qp,
1070 struct rxe_pkt_info *pkt)
1071{
1072 enum resp_states rc;
1073 u32 prev_psn = (qp->resp.ack_psn - 1) & BTH_PSN_MASK;
1074
1075 if (pkt->mask & RXE_SEND_MASK ||
1076 pkt->mask & RXE_WRITE_MASK) {
1077
1078 if (bth_ack(pkt))
1079 send_ack(qp, pkt, AETH_ACK_UNLIMITED, prev_psn);
1080 rc = RESPST_CLEANUP;
1081 goto out;
1082 } else if (pkt->mask & RXE_READ_MASK) {
1083 struct resp_res *res;
1084
1085 res = find_resource(qp, pkt->psn);
1086 if (!res) {
1087
1088
1089
1090 rc = RESPST_CLEANUP;
1091 goto out;
1092 } else {
1093
1094
1095
1096 u64 iova = reth_va(pkt);
1097 u32 resid = reth_len(pkt);
1098
1099 if (iova < res->read.va_org ||
1100 resid > res->read.length ||
1101 (iova + resid) > (res->read.va_org +
1102 res->read.length)) {
1103 rc = RESPST_CLEANUP;
1104 goto out;
1105 }
1106
1107 if (reth_rkey(pkt) != res->read.rkey) {
1108 rc = RESPST_CLEANUP;
1109 goto out;
1110 }
1111
1112 res->cur_psn = pkt->psn;
1113 res->state = (pkt->psn == res->first_psn) ?
1114 rdatm_res_state_new :
1115 rdatm_res_state_replay;
1116 res->replay = 1;
1117
1118
1119 res->read.va_org = iova;
1120 res->read.va = iova;
1121 res->read.resid = resid;
1122
1123
1124 qp->resp.res = res;
1125 rc = RESPST_READ_REPLY;
1126 goto out;
1127 }
1128 } else {
1129 struct resp_res *res;
1130
1131
1132 res = find_resource(qp, pkt->psn);
1133 if (res) {
1134 skb_get(res->atomic.skb);
1135
1136 rc = rxe_xmit_packet(qp, pkt, res->atomic.skb);
1137 if (rc) {
1138 pr_err("Failed resending result. This flow is not handled - skb ignored\n");
1139 rc = RESPST_CLEANUP;
1140 goto out;
1141 }
1142 }
1143
1144
1145 rc = RESPST_CLEANUP;
1146 goto out;
1147 }
1148out:
1149 return rc;
1150}
1151
1152
1153static void do_class_ac_error(struct rxe_qp *qp, u8 syndrome,
1154 enum ib_wc_status status)
1155{
1156 qp->resp.aeth_syndrome = syndrome;
1157 qp->resp.status = status;
1158
1159
1160 qp->resp.goto_error = 1;
1161}
1162
1163static enum resp_states do_class_d1e_error(struct rxe_qp *qp)
1164{
1165
1166 if (qp->srq) {
1167
1168 qp->resp.drop_msg = 1;
1169 if (qp->resp.wqe) {
1170 qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1171 return RESPST_COMPLETE;
1172 } else {
1173 return RESPST_CLEANUP;
1174 }
1175 } else {
1176
1177
1178
1179
1180
1181 if (qp->resp.wqe) {
1182 qp->resp.wqe->dma.resid = qp->resp.wqe->dma.length;
1183 qp->resp.wqe->dma.cur_sge = 0;
1184 qp->resp.wqe->dma.sge_offset = 0;
1185 qp->resp.opcode = -1;
1186 }
1187
1188 if (qp->resp.mr) {
1189 rxe_drop_ref(qp->resp.mr);
1190 qp->resp.mr = NULL;
1191 }
1192
1193 return RESPST_CLEANUP;
1194 }
1195}
1196
1197static void rxe_drain_req_pkts(struct rxe_qp *qp, bool notify)
1198{
1199 struct sk_buff *skb;
1200
1201 while ((skb = skb_dequeue(&qp->req_pkts))) {
1202 rxe_drop_ref(qp);
1203 kfree_skb(skb);
1204 }
1205
1206 if (notify)
1207 return;
1208
1209 while (!qp->srq && qp->rq.queue && queue_head(qp->rq.queue))
1210 advance_consumer(qp->rq.queue);
1211}
1212
1213int rxe_responder(void *arg)
1214{
1215 struct rxe_qp *qp = (struct rxe_qp *)arg;
1216 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
1217 enum resp_states state;
1218 struct rxe_pkt_info *pkt = NULL;
1219 int ret = 0;
1220
1221 rxe_add_ref(qp);
1222
1223 qp->resp.aeth_syndrome = AETH_ACK_UNLIMITED;
1224
1225 if (!qp->valid) {
1226 ret = -EINVAL;
1227 goto done;
1228 }
1229
1230 switch (qp->resp.state) {
1231 case QP_STATE_RESET:
1232 state = RESPST_RESET;
1233 break;
1234
1235 default:
1236 state = RESPST_GET_REQ;
1237 break;
1238 }
1239
1240 while (1) {
1241 pr_debug("qp#%d state = %s\n", qp_num(qp),
1242 resp_state_name[state]);
1243 switch (state) {
1244 case RESPST_GET_REQ:
1245 state = get_req(qp, &pkt);
1246 break;
1247 case RESPST_CHK_PSN:
1248 state = check_psn(qp, pkt);
1249 break;
1250 case RESPST_CHK_OP_SEQ:
1251 state = check_op_seq(qp, pkt);
1252 break;
1253 case RESPST_CHK_OP_VALID:
1254 state = check_op_valid(qp, pkt);
1255 break;
1256 case RESPST_CHK_RESOURCE:
1257 state = check_resource(qp, pkt);
1258 break;
1259 case RESPST_CHK_LENGTH:
1260 state = check_length(qp, pkt);
1261 break;
1262 case RESPST_CHK_RKEY:
1263 state = check_rkey(qp, pkt);
1264 break;
1265 case RESPST_EXECUTE:
1266 state = execute(qp, pkt);
1267 break;
1268 case RESPST_COMPLETE:
1269 state = do_complete(qp, pkt);
1270 break;
1271 case RESPST_READ_REPLY:
1272 state = read_reply(qp, pkt);
1273 break;
1274 case RESPST_ACKNOWLEDGE:
1275 state = acknowledge(qp, pkt);
1276 break;
1277 case RESPST_CLEANUP:
1278 state = cleanup(qp, pkt);
1279 break;
1280 case RESPST_DUPLICATE_REQUEST:
1281 state = duplicate_request(qp, pkt);
1282 break;
1283 case RESPST_ERR_PSN_OUT_OF_SEQ:
1284
1285 send_ack(qp, pkt, AETH_NAK_PSN_SEQ_ERROR, qp->resp.psn);
1286 state = RESPST_CLEANUP;
1287 break;
1288
1289 case RESPST_ERR_TOO_MANY_RDMA_ATM_REQ:
1290 case RESPST_ERR_MISSING_OPCODE_FIRST:
1291 case RESPST_ERR_MISSING_OPCODE_LAST_C:
1292 case RESPST_ERR_UNSUPPORTED_OPCODE:
1293 case RESPST_ERR_MISALIGNED_ATOMIC:
1294
1295 do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1296 IB_WC_REM_INV_REQ_ERR);
1297 state = RESPST_COMPLETE;
1298 break;
1299
1300 case RESPST_ERR_MISSING_OPCODE_LAST_D1E:
1301 state = do_class_d1e_error(qp);
1302 break;
1303 case RESPST_ERR_RNR:
1304 if (qp_type(qp) == IB_QPT_RC) {
1305 rxe_counter_inc(rxe, RXE_CNT_SND_RNR);
1306
1307 send_ack(qp, pkt, AETH_RNR_NAK |
1308 (~AETH_TYPE_MASK &
1309 qp->attr.min_rnr_timer),
1310 pkt->psn);
1311 } else {
1312
1313 qp->resp.drop_msg = 1;
1314 }
1315 state = RESPST_CLEANUP;
1316 break;
1317
1318 case RESPST_ERR_RKEY_VIOLATION:
1319 if (qp_type(qp) == IB_QPT_RC) {
1320
1321 do_class_ac_error(qp, AETH_NAK_REM_ACC_ERR,
1322 IB_WC_REM_ACCESS_ERR);
1323 state = RESPST_COMPLETE;
1324 } else {
1325 qp->resp.drop_msg = 1;
1326 if (qp->srq) {
1327
1328 qp->resp.status = IB_WC_REM_ACCESS_ERR;
1329 state = RESPST_COMPLETE;
1330 } else {
1331
1332 state = RESPST_CLEANUP;
1333 }
1334 }
1335 break;
1336
1337 case RESPST_ERR_LENGTH:
1338 if (qp_type(qp) == IB_QPT_RC) {
1339
1340 do_class_ac_error(qp, AETH_NAK_INVALID_REQ,
1341 IB_WC_REM_INV_REQ_ERR);
1342 state = RESPST_COMPLETE;
1343 } else if (qp->srq) {
1344
1345 qp->resp.status = IB_WC_REM_INV_REQ_ERR;
1346 state = RESPST_COMPLETE;
1347 } else {
1348
1349 qp->resp.drop_msg = 1;
1350 state = RESPST_CLEANUP;
1351 }
1352 break;
1353
1354 case RESPST_ERR_MALFORMED_WQE:
1355
1356 do_class_ac_error(qp, AETH_NAK_REM_OP_ERR,
1357 IB_WC_LOC_QP_OP_ERR);
1358 state = RESPST_COMPLETE;
1359 break;
1360
1361 case RESPST_ERR_CQ_OVERFLOW:
1362
1363 state = RESPST_ERROR;
1364 break;
1365
1366 case RESPST_DONE:
1367 if (qp->resp.goto_error) {
1368 state = RESPST_ERROR;
1369 break;
1370 }
1371
1372 goto done;
1373
1374 case RESPST_EXIT:
1375 if (qp->resp.goto_error) {
1376 state = RESPST_ERROR;
1377 break;
1378 }
1379
1380 goto exit;
1381
1382 case RESPST_RESET:
1383 rxe_drain_req_pkts(qp, false);
1384 qp->resp.wqe = NULL;
1385 goto exit;
1386
1387 case RESPST_ERROR:
1388 qp->resp.goto_error = 0;
1389 pr_warn("qp#%d moved to error state\n", qp_num(qp));
1390 rxe_qp_error(qp);
1391 goto exit;
1392
1393 default:
1394 WARN_ON_ONCE(1);
1395 }
1396 }
1397
1398exit:
1399 ret = -EAGAIN;
1400done:
1401 rxe_drop_ref(qp);
1402 return ret;
1403}
1404
