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CommitLineData
8700e3e7
MS		 1/*
2 * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
3 * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34#include <linux/skbuff.h>
35
36#include "rxe.h"
37#include "rxe_loc.h"
38#include "rxe_queue.h"
39#include "rxe_task.h"
40
41enum comp_state {
42 COMPST_GET_ACK,
43 COMPST_GET_WQE,
44 COMPST_COMP_WQE,
45 COMPST_COMP_ACK,
46 COMPST_CHECK_PSN,
47 COMPST_CHECK_ACK,
48 COMPST_READ,
49 COMPST_ATOMIC,
50 COMPST_WRITE_SEND,
51 COMPST_UPDATE_COMP,
52 COMPST_ERROR_RETRY,
53 COMPST_RNR_RETRY,
54 COMPST_ERROR,
55 COMPST_EXIT, /* We have an issue, and we want to rerun the completer */
56 COMPST_DONE, /* The completer finished successflly */
57};
58
59static char *comp_state_name[] = {
60 [COMPST_GET_ACK] = "GET ACK",
61 [COMPST_GET_WQE] = "GET WQE",
62 [COMPST_COMP_WQE] = "COMP WQE",
63 [COMPST_COMP_ACK] = "COMP ACK",
64 [COMPST_CHECK_PSN] = "CHECK PSN",
65 [COMPST_CHECK_ACK] = "CHECK ACK",
66 [COMPST_READ] = "READ",
67 [COMPST_ATOMIC] = "ATOMIC",
68 [COMPST_WRITE_SEND] = "WRITE/SEND",
69 [COMPST_UPDATE_COMP] = "UPDATE COMP",
70 [COMPST_ERROR_RETRY] = "ERROR RETRY",
71 [COMPST_RNR_RETRY] = "RNR RETRY",
72 [COMPST_ERROR] = "ERROR",
73 [COMPST_EXIT] = "EXIT",
74 [COMPST_DONE] = "DONE",
75};
76
77static unsigned long rnrnak_usec[32] = {
78 [IB_RNR_TIMER_655_36] = 655360,
79 [IB_RNR_TIMER_000_01] = 10,
80 [IB_RNR_TIMER_000_02] = 20,
81 [IB_RNR_TIMER_000_03] = 30,
82 [IB_RNR_TIMER_000_04] = 40,
83 [IB_RNR_TIMER_000_06] = 60,
84 [IB_RNR_TIMER_000_08] = 80,
85 [IB_RNR_TIMER_000_12] = 120,
86 [IB_RNR_TIMER_000_16] = 160,
87 [IB_RNR_TIMER_000_24] = 240,
88 [IB_RNR_TIMER_000_32] = 320,
89 [IB_RNR_TIMER_000_48] = 480,
90 [IB_RNR_TIMER_000_64] = 640,
91 [IB_RNR_TIMER_000_96] = 960,
92 [IB_RNR_TIMER_001_28] = 1280,
93 [IB_RNR_TIMER_001_92] = 1920,
94 [IB_RNR_TIMER_002_56] = 2560,
95 [IB_RNR_TIMER_003_84] = 3840,
96 [IB_RNR_TIMER_005_12] = 5120,
97 [IB_RNR_TIMER_007_68] = 7680,
98 [IB_RNR_TIMER_010_24] = 10240,
99 [IB_RNR_TIMER_015_36] = 15360,
100 [IB_RNR_TIMER_020_48] = 20480,
101 [IB_RNR_TIMER_030_72] = 30720,
102 [IB_RNR_TIMER_040_96] = 40960,
103 [IB_RNR_TIMER_061_44] = 61410,
104 [IB_RNR_TIMER_081_92] = 81920,
105 [IB_RNR_TIMER_122_88] = 122880,
106 [IB_RNR_TIMER_163_84] = 163840,
107 [IB_RNR_TIMER_245_76] = 245760,
108 [IB_RNR_TIMER_327_68] = 327680,
109 [IB_RNR_TIMER_491_52] = 491520,
110};
111
112static inline unsigned long rnrnak_jiffies(u8 timeout)
113{
114 return max_t(unsigned long,
115 usecs_to_jiffies(rnrnak_usec[timeout]), 1);
116}
117
118static enum ib_wc_opcode wr_to_wc_opcode(enum ib_wr_opcode opcode)
119{
120 switch (opcode) {
121 case IB_WR_RDMA_WRITE: return IB_WC_RDMA_WRITE;
122 case IB_WR_RDMA_WRITE_WITH_IMM: return IB_WC_RDMA_WRITE;
123 case IB_WR_SEND: return IB_WC_SEND;
124 case IB_WR_SEND_WITH_IMM: return IB_WC_SEND;
125 case IB_WR_RDMA_READ: return IB_WC_RDMA_READ;
126 case IB_WR_ATOMIC_CMP_AND_SWP: return IB_WC_COMP_SWAP;
127 case IB_WR_ATOMIC_FETCH_AND_ADD: return IB_WC_FETCH_ADD;
128 case IB_WR_LSO: return IB_WC_LSO;
129 case IB_WR_SEND_WITH_INV: return IB_WC_SEND;
130 case IB_WR_RDMA_READ_WITH_INV: return IB_WC_RDMA_READ;
131 case IB_WR_LOCAL_INV: return IB_WC_LOCAL_INV;
132 case IB_WR_REG_MR: return IB_WC_REG_MR;
133
134 default:
135 return 0xff;
136 }
137}
138
3bfbea74 139void retransmit_timer(struct timer_list *t)
8700e3e7 140{
3bfbea74 141 struct rxe_qp *qp = from_timer(qp, t, retrans_timer);
8700e3e7
MS		 142
143 if (qp->valid) {
144 qp->comp.timeout = 1;
145 rxe_run_task(&qp->comp.task, 1);
146 }
147}
148
9802c335 149void rxe_comp_queue_pkt(struct rxe_qp *qp, struct sk_buff *skb)
8700e3e7
MS		 150{
151 int must_sched;
152
153 skb_queue_tail(&qp->resp_pkts, skb);
154
155 must_sched = skb_queue_len(&qp->resp_pkts) > 1;
0b1e5b99 156 if (must_sched != 0)
9802c335
ZY		 157 rxe_counter_inc(SKB_TO_PKT(skb)->rxe, RXE_CNT_COMPLETER_SCHED);
158
8700e3e7
MS		 159 rxe_run_task(&qp->comp.task, must_sched);
160}
161
162static inline enum comp_state get_wqe(struct rxe_qp *qp,
163 struct rxe_pkt_info *pkt,
164 struct rxe_send_wqe **wqe_p)
165{
166 struct rxe_send_wqe *wqe;
167
168 /* we come here whether or not we found a response packet to see if
169 * there are any posted WQEs
170 */
171 wqe = queue_head(qp->sq.queue);
172 *wqe_p = wqe;
173
174 /* no WQE or requester has not started it yet */
175 if (!wqe || wqe->state == wqe_state_posted)
176 return pkt ? COMPST_DONE : COMPST_EXIT;
177
178 /* WQE does not require an ack */
179 if (wqe->state == wqe_state_done)
180 return COMPST_COMP_WQE;
181
182 /* WQE caused an error */
183 if (wqe->state == wqe_state_error)
184 return COMPST_ERROR;
185
186 /* we have a WQE, if we also have an ack check its PSN */
187 return pkt ? COMPST_CHECK_PSN : COMPST_EXIT;
188}
189
190static inline void reset_retry_counters(struct rxe_qp *qp)
191{
192 qp->comp.retry_cnt = qp->attr.retry_cnt;
193 qp->comp.rnr_retry = qp->attr.rnr_retry;
4e4c53df 194 qp->comp.started_retry = 0;
8700e3e7
MS		 195}
196
197static inline enum comp_state check_psn(struct rxe_qp *qp,
198 struct rxe_pkt_info *pkt,
199 struct rxe_send_wqe *wqe)
200{
201 s32 diff;
202
203 /* check to see if response is past the oldest WQE. if it is, complete
204 * send/write or error read/atomic
205 */
206 diff = psn_compare(pkt->psn, wqe->last_psn);
207 if (diff > 0) {
208 if (wqe->state == wqe_state_pending) {
209 if (wqe->mask & WR_ATOMIC_OR_READ_MASK)
210 return COMPST_ERROR_RETRY;
211
212 reset_retry_counters(qp);
213 return COMPST_COMP_WQE;
214 } else {
215 return COMPST_DONE;
216 }
217 }
218
219 /* compare response packet to expected response */
220 diff = psn_compare(pkt->psn, qp->comp.psn);
221 if (diff < 0) {
222 /* response is most likely a retried packet if it matches an
223 * uncompleted WQE go complete it else ignore it
224 */
225 if (pkt->psn == wqe->last_psn)
226 return COMPST_COMP_ACK;
227 else
228 return COMPST_DONE;
229 } else if ((diff > 0) && (wqe->mask & WR_ATOMIC_OR_READ_MASK)) {
cbf1f9a4 230 return COMPST_DONE;
8700e3e7
MS		 231 } else {
232 return COMPST_CHECK_ACK;
233 }
234}
235
236static inline enum comp_state check_ack(struct rxe_qp *qp,
237 struct rxe_pkt_info *pkt,
238 struct rxe_send_wqe *wqe)
239{
240 unsigned int mask = pkt->mask;
241 u8 syn;
0b1e5b99 242 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
8700e3e7
MS		 243
244 /* Check the sequence only */
245 switch (qp->comp.opcode) {
246 case -1:
247 /* Will catch all *_ONLY cases. */
248 if (!(mask & RXE_START_MASK))
249 return COMPST_ERROR;
250
251 break;
252
253 case IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST:
254 case IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE:
255 if (pkt->opcode != IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE &&
256 pkt->opcode != IB_OPCODE_RC_RDMA_READ_RESPONSE_LAST) {
030e46e4
VI		 257 /* read retries of partial data may restart from
258 * read response first or response only.
259 */
260 if ((pkt->psn == wqe->first_psn &&
261 pkt->opcode ==
262 IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST) ||
263 (wqe->first_psn == wqe->last_psn &&
264 pkt->opcode ==
265 IB_OPCODE_RC_RDMA_READ_RESPONSE_ONLY))
266 break;
267
8700e3e7
MS		 268 return COMPST_ERROR;
269 }
270 break;
271 default:
43553b47 272 WARN_ON_ONCE(1);
8700e3e7
MS		 273 }
274
275 /* Check operation validity. */
276 switch (pkt->opcode) {
277 case IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST:
278 case IB_OPCODE_RC_RDMA_READ_RESPONSE_LAST:
279 case IB_OPCODE_RC_RDMA_READ_RESPONSE_ONLY:
280 syn = aeth_syn(pkt);
281
282 if ((syn & AETH_TYPE_MASK) != AETH_ACK)
283 return COMPST_ERROR;
284
df561f66 285 fallthrough;
ea6ee93b 286 /* (IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE doesn't have an AETH)
8700e3e7
MS		 287 */
288 case IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE:
289 if (wqe->wr.opcode != IB_WR_RDMA_READ &&
290 wqe->wr.opcode != IB_WR_RDMA_READ_WITH_INV) {
61b717d0 291 wqe->status = IB_WC_FATAL_ERR;
8700e3e7
MS		 292 return COMPST_ERROR;
293 }
294 reset_retry_counters(qp);
295 return COMPST_READ;
296
297 case IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE:
298 syn = aeth_syn(pkt);
299
300 if ((syn & AETH_TYPE_MASK) != AETH_ACK)
301 return COMPST_ERROR;
302
303 if (wqe->wr.opcode != IB_WR_ATOMIC_CMP_AND_SWP &&
304 wqe->wr.opcode != IB_WR_ATOMIC_FETCH_AND_ADD)
305 return COMPST_ERROR;
306 reset_retry_counters(qp);
307 return COMPST_ATOMIC;
308
309 case IB_OPCODE_RC_ACKNOWLEDGE:
310 syn = aeth_syn(pkt);
311 switch (syn & AETH_TYPE_MASK) {
312 case AETH_ACK:
313 reset_retry_counters(qp);
314 return COMPST_WRITE_SEND;
315
316 case AETH_RNR_NAK:
0b1e5b99 317 rxe_counter_inc(rxe, RXE_CNT_RCV_RNR);
8700e3e7
MS		 318 return COMPST_RNR_RETRY;
319
320 case AETH_NAK:
321 switch (syn) {
322 case AETH_NAK_PSN_SEQ_ERROR:
323 /* a nak implicitly acks all packets with psns
324 * before
325 */
326 if (psn_compare(pkt->psn, qp->comp.psn) > 0) {
0b1e5b99
YC		 327 rxe_counter_inc(rxe,
328 RXE_CNT_RCV_SEQ_ERR);
8700e3e7
MS		 329 qp->comp.psn = pkt->psn;
330 if (qp->req.wait_psn) {
331 qp->req.wait_psn = 0;
8ac0e664 332 rxe_run_task(&qp->req.task, 0);
8700e3e7
MS		 333 }
334 }
335 return COMPST_ERROR_RETRY;
336
337 case AETH_NAK_INVALID_REQ:
338 wqe->status = IB_WC_REM_INV_REQ_ERR;
339 return COMPST_ERROR;
340
341 case AETH_NAK_REM_ACC_ERR:
342 wqe->status = IB_WC_REM_ACCESS_ERR;
343 return COMPST_ERROR;
344
345 case AETH_NAK_REM_OP_ERR:
346 wqe->status = IB_WC_REM_OP_ERR;
347 return COMPST_ERROR;
348
349 default:
350 pr_warn("unexpected nak %x\n", syn);
351 wqe->status = IB_WC_REM_OP_ERR;
352 return COMPST_ERROR;
353 }
354
355 default:
356 return COMPST_ERROR;
357 }
358 break;
359
360 default:
361 pr_warn("unexpected opcode\n");
362 }
363
364 return COMPST_ERROR;
365}
366
367static inline enum comp_state do_read(struct rxe_qp *qp,
368 struct rxe_pkt_info *pkt,
369 struct rxe_send_wqe *wqe)
370{
8700e3e7
MS		 371 int ret;
372
e12ee8ce 373 ret = copy_data(qp->pd, IB_ACCESS_LOCAL_WRITE,
8700e3e7
MS		 374 &wqe->dma, payload_addr(pkt),
375 payload_size(pkt), to_mem_obj, NULL);
376 if (ret)
377 return COMPST_ERROR;
378
379 if (wqe->dma.resid == 0 && (pkt->mask & RXE_END_MASK))
380 return COMPST_COMP_ACK;
381 else
382 return COMPST_UPDATE_COMP;
383}
384
385static inline enum comp_state do_atomic(struct rxe_qp *qp,
386 struct rxe_pkt_info *pkt,
387 struct rxe_send_wqe *wqe)
388{
8700e3e7
MS		 389 int ret;
390
391 u64 atomic_orig = atmack_orig(pkt);
392
e12ee8ce 393 ret = copy_data(qp->pd, IB_ACCESS_LOCAL_WRITE,
8700e3e7
MS		 394 &wqe->dma, &atomic_orig,
395 sizeof(u64), to_mem_obj, NULL);
396 if (ret)
397 return COMPST_ERROR;
398 else
399 return COMPST_COMP_ACK;
400}
401
402static void make_send_cqe(struct rxe_qp *qp, struct rxe_send_wqe *wqe,
403 struct rxe_cqe *cqe)
404{
405 memset(cqe, 0, sizeof(*cqe));
406
407 if (!qp->is_user) {
408 struct ib_wc *wc = &cqe->ibwc;
409
410 wc->wr_id = wqe->wr.wr_id;
411 wc->status = wqe->status;
412 wc->opcode = wr_to_wc_opcode(wqe->wr.opcode);
413 if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM ||
414 wqe->wr.opcode == IB_WR_SEND_WITH_IMM)
415 wc->wc_flags = IB_WC_WITH_IMM;
416 wc->byte_len = wqe->dma.length;
417 wc->qp = &qp->ibqp;
418 } else {
419 struct ib_uverbs_wc *uwc = &cqe->uibwc;
420
421 uwc->wr_id = wqe->wr.wr_id;
422 uwc->status = wqe->status;
423 uwc->opcode = wr_to_wc_opcode(wqe->wr.opcode);
424 if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM ||
425 wqe->wr.opcode == IB_WR_SEND_WITH_IMM)
426 uwc->wc_flags = IB_WC_WITH_IMM;
427 uwc->byte_len = wqe->dma.length;
428 uwc->qp_num = qp->ibqp.qp_num;
429 }
430}
431
18d3451c
BVA		 432/*
433 * IBA Spec. Section 10.7.3.1 SIGNALED COMPLETIONS
434 * ---------8<---------8<-------------
435 * ...Note that if a completion error occurs, a Work Completion
436 * will always be generated, even if the signaling
437 * indicator requests an Unsignaled Completion.
438 * ---------8<---------8<-------------
439 */
8700e3e7
MS		 440static void do_complete(struct rxe_qp *qp, struct rxe_send_wqe *wqe)
441{
6e5559b2 442 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
8700e3e7
MS		 443 struct rxe_cqe cqe;
444
445 if ((qp->sq_sig_type == IB_SIGNAL_ALL_WR) ||
446 (wqe->wr.send_flags & IB_SEND_SIGNALED) ||
18d3451c 447 wqe->status != IB_WC_SUCCESS) {
8700e3e7 448 make_send_cqe(qp, wqe, &cqe);
dd753d87 449 advance_consumer(qp->sq.queue);
8700e3e7 450 rxe_cq_post(qp->scq, &cqe, 0);
dd753d87
AB		 451 } else {
452 advance_consumer(qp->sq.queue);
8700e3e7
MS		 453 }
454
6e5559b2
AB		 455 if (wqe->wr.opcode == IB_WR_SEND ||
456 wqe->wr.opcode == IB_WR_SEND_WITH_IMM ||
457 wqe->wr.opcode == IB_WR_SEND_WITH_INV)
458 rxe_counter_inc(rxe, RXE_CNT_RDMA_SEND);
459
8700e3e7
MS		 460 /*
461 * we completed something so let req run again
462 * if it is trying to fence
463 */
464 if (qp->req.wait_fence) {
465 qp->req.wait_fence = 0;
8ac0e664 466 rxe_run_task(&qp->req.task, 0);
8700e3e7
MS		 467 }
468}
469
470static inline enum comp_state complete_ack(struct rxe_qp *qp,
471 struct rxe_pkt_info *pkt,
472 struct rxe_send_wqe *wqe)
473{
474 unsigned long flags;
475
476 if (wqe->has_rd_atomic) {
477 wqe->has_rd_atomic = 0;
478 atomic_inc(&qp->req.rd_atomic);
479 if (qp->req.need_rd_atomic) {
480 qp->comp.timeout_retry = 0;
481 qp->req.need_rd_atomic = 0;
8ac0e664 482 rxe_run_task(&qp->req.task, 0);
8700e3e7
MS		 483 }
484 }
485
486 if (unlikely(qp->req.state == QP_STATE_DRAIN)) {
487 /* state_lock used by requester & completer */
488 spin_lock_irqsave(&qp->state_lock, flags);
489 if ((qp->req.state == QP_STATE_DRAIN) &&
490 (qp->comp.psn == qp->req.psn)) {
491 qp->req.state = QP_STATE_DRAINED;
492 spin_unlock_irqrestore(&qp->state_lock, flags);
493
494 if (qp->ibqp.event_handler) {
495 struct ib_event ev;
496
497 ev.device = qp->ibqp.device;
498 ev.element.qp = &qp->ibqp;
499 ev.event = IB_EVENT_SQ_DRAINED;
500 qp->ibqp.event_handler(&ev,
501 qp->ibqp.qp_context);
502 }
503 } else {
504 spin_unlock_irqrestore(&qp->state_lock, flags);
505 }
506 }
507
508 do_complete(qp, wqe);
509
510 if (psn_compare(pkt->psn, qp->comp.psn) >= 0)
511 return COMPST_UPDATE_COMP;
512 else
513 return COMPST_DONE;
514}
515
516static inline enum comp_state complete_wqe(struct rxe_qp *qp,
517 struct rxe_pkt_info *pkt,
518 struct rxe_send_wqe *wqe)
519{
030e46e4
VI		 520 if (pkt && wqe->state == wqe_state_pending) {
521 if (psn_compare(wqe->last_psn, qp->comp.psn) >= 0) {
522 qp->comp.psn = (wqe->last_psn + 1) & BTH_PSN_MASK;
523 qp->comp.opcode = -1;
524 }
8700e3e7
MS		 525
526 if (qp->req.wait_psn) {
527 qp->req.wait_psn = 0;
528 rxe_run_task(&qp->req.task, 1);
529 }
530 }
531
532 do_complete(qp, wqe);
533
534 return COMPST_GET_WQE;
535}
536
723ec9ae 537static void rxe_drain_resp_pkts(struct rxe_qp *qp, bool notify)
8700e3e7 538{
723ec9ae
BVA		 539 struct sk_buff *skb;
540 struct rxe_send_wqe *wqe;
8700e3e7 541
723ec9ae
BVA		 542 while ((skb = skb_dequeue(&qp->resp_pkts))) {
543 rxe_drop_ref(qp);
544 kfree_skb(skb);
8700e3e7
MS		 545 }
546
723ec9ae
BVA		 547 while ((wqe = queue_head(qp->sq.queue))) {
548 if (notify) {
8700e3e7
MS		 549 wqe->status = IB_WC_WR_FLUSH_ERR;
550 do_complete(qp, wqe);
723ec9ae
BVA		 551 } else {
552 advance_consumer(qp->sq.queue);
8700e3e7 553 }
8700e3e7 554 }
723ec9ae 555}
8700e3e7 556
723ec9ae
BVA		 557int rxe_completer(void *arg)
558{
559 struct rxe_qp *qp = (struct rxe_qp *)arg;
0b1e5b99 560 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
d3e53971 561 struct rxe_send_wqe *wqe = NULL;
723ec9ae
BVA		 562 struct sk_buff *skb = NULL;
563 struct rxe_pkt_info *pkt = NULL;
564 enum comp_state state;
8700e3e7 565
723ec9ae 566 rxe_add_ref(qp);
8700e3e7 567
723ec9ae
BVA		 568 if (!qp->valid || qp->req.state == QP_STATE_ERROR ||
569 qp->req.state == QP_STATE_RESET) {
570 rxe_drain_resp_pkts(qp, qp->valid &&
571 qp->req.state == QP_STATE_ERROR);
8700e3e7
MS		 572 goto exit;
573 }
574
575 if (qp->comp.timeout) {
576 qp->comp.timeout_retry = 1;
577 qp->comp.timeout = 0;
578 } else {
579 qp->comp.timeout_retry = 0;
580 }
581
582 if (qp->req.need_retry)
583 goto exit;
584
585 state = COMPST_GET_ACK;
586
587 while (1) {
e404f945
PP		 588 pr_debug("qp#%d state = %s\n", qp_num(qp),
589 comp_state_name[state]);
8700e3e7
MS		 590 switch (state) {
591 case COMPST_GET_ACK:
592 skb = skb_dequeue(&qp->resp_pkts);
593 if (skb) {
594 pkt = SKB_TO_PKT(skb);
595 qp->comp.timeout_retry = 0;
596 }
597 state = COMPST_GET_WQE;
598 break;
599
600 case COMPST_GET_WQE:
601 state = get_wqe(qp, pkt, &wqe);
602 break;
603
604 case COMPST_CHECK_PSN:
605 state = check_psn(qp, pkt, wqe);
606 break;
607
608 case COMPST_CHECK_ACK:
609 state = check_ack(qp, pkt, wqe);
610 break;
611
612 case COMPST_READ:
613 state = do_read(qp, pkt, wqe);
614 break;
615
616 case COMPST_ATOMIC:
617 state = do_atomic(qp, pkt, wqe);
618 break;
619
620 case COMPST_WRITE_SEND:
621 if (wqe->state == wqe_state_pending &&
622 wqe->last_psn == pkt->psn)
623 state = COMPST_COMP_ACK;
624 else
625 state = COMPST_UPDATE_COMP;
626 break;
627
628 case COMPST_COMP_ACK:
629 state = complete_ack(qp, pkt, wqe);
630 break;
631
632 case COMPST_COMP_WQE:
633 state = complete_wqe(qp, pkt, wqe);
634 break;
635
636 case COMPST_UPDATE_COMP:
637 if (pkt->mask & RXE_END_MASK)
638 qp->comp.opcode = -1;
639 else
640 qp->comp.opcode = pkt->opcode;
641
642 if (psn_compare(pkt->psn, qp->comp.psn) >= 0)
643 qp->comp.psn = (pkt->psn + 1) & BTH_PSN_MASK;
644
645 if (qp->req.wait_psn) {
646 qp->req.wait_psn = 0;
647 rxe_run_task(&qp->req.task, 1);
648 }
649
650 state = COMPST_DONE;
651 break;
652
653 case COMPST_DONE:
654 if (pkt) {
655 rxe_drop_ref(pkt->qp);
656 kfree_skb(skb);
c5540a01 657 skb = NULL;
8700e3e7
MS		 658 }
659 goto done;
660
661 case COMPST_EXIT:
662 if (qp->comp.timeout_retry && wqe) {
663 state = COMPST_ERROR_RETRY;
664 break;
665 }
666
667 /* re reset the timeout counter if
668 * (1) QP is type RC
669 * (2) the QP is alive
670 * (3) there is a packet sent by the requester that
671 * might be acked (we still might get spurious
672 * timeouts but try to keep them as few as possible)
673 * (4) the timeout parameter is set
674 */
675 if ((qp_type(qp) == IB_QPT_RC) &&
676 (qp->req.state == QP_STATE_READY) &&
677 (psn_compare(qp->req.psn, qp->comp.psn) > 0) &&
678 qp->qp_timeout_jiffies)
679 mod_timer(&qp->retrans_timer,
680 jiffies + qp->qp_timeout_jiffies);
681 goto exit;
682
683 case COMPST_ERROR_RETRY:
684 /* we come here if the retry timer fired and we did
685 * not receive a response packet. try to retry the send
686 * queue if that makes sense and the limits have not
687 * been exceeded. remember that some timeouts are
688 * spurious since we do not reset the timer but kick
689 * it down the road or let it expire
690 */
691
692 /* there is nothing to retry in this case */
c5540a01 693 if (!wqe || (wqe->state == wqe_state_posted)) {
8700e3e7 694 goto exit;
c5540a01 695 }
8700e3e7 696
4e4c53df
VI		 697 /* if we've started a retry, don't start another
698 * retry sequence, unless this is a timeout.
699 */
700 if (qp->comp.started_retry &&
701 !qp->comp.timeout_retry) {
702 if (pkt) {
703 rxe_drop_ref(pkt->qp);
704 kfree_skb(skb);
705 skb = NULL;
706 }
707
708 goto done;
709 }
710
8700e3e7
MS		 711 if (qp->comp.retry_cnt > 0) {
712 if (qp->comp.retry_cnt != 7)
713 qp->comp.retry_cnt--;
714
715 /* no point in retrying if we have already
716 * seen the last ack that the requester could
717 * have caused
718 */
719 if (psn_compare(qp->req.psn,
720 qp->comp.psn) > 0) {
721 /* tell the requester to retry the
0b1e5b99 722 * send queue next time around
8700e3e7 723 */
0b1e5b99
YC		 724 rxe_counter_inc(rxe,
725 RXE_CNT_COMP_RETRY);
8700e3e7 726 qp->req.need_retry = 1;
4e4c53df 727 qp->comp.started_retry = 1;
8ac0e664 728 rxe_run_task(&qp->req.task, 0);
8700e3e7 729 }
c1cc72cb
YC		 730
731 if (pkt) {
732 rxe_drop_ref(pkt->qp);
733 kfree_skb(skb);
c5540a01 734 skb = NULL;
c1cc72cb
YC		 735 }
736
4e4c53df 737 goto done;
c1cc72cb 738
8700e3e7 739 } else {
0b1e5b99 740 rxe_counter_inc(rxe, RXE_CNT_RETRY_EXCEEDED);
8700e3e7
MS		 741 wqe->status = IB_WC_RETRY_EXC_ERR;
742 state = COMPST_ERROR;
743 }
744 break;
745
746 case COMPST_RNR_RETRY:
747 if (qp->comp.rnr_retry > 0) {
748 if (qp->comp.rnr_retry != 7)
749 qp->comp.rnr_retry--;
750
751 qp->req.need_retry = 1;
e404f945
PP		 752 pr_debug("qp#%d set rnr nak timer\n",
753 qp_num(qp));
8700e3e7
MS		 754 mod_timer(&qp->rnr_nak_timer,
755 jiffies + rnrnak_jiffies(aeth_syn(pkt)
756 & ~AETH_TYPE_MASK));
c5540a01
BVA		 757 rxe_drop_ref(pkt->qp);
758 kfree_skb(skb);
759 skb = NULL;
8700e3e7
MS		 760 goto exit;
761 } else {
0b1e5b99
YC		 762 rxe_counter_inc(rxe,
763 RXE_CNT_RNR_RETRY_EXCEEDED);
8700e3e7
MS		 764 wqe->status = IB_WC_RNR_RETRY_EXC_ERR;
765 state = COMPST_ERROR;
766 }
767 break;
768
769 case COMPST_ERROR:
18d3451c 770 WARN_ON_ONCE(wqe->status == IB_WC_SUCCESS);
8700e3e7
MS		 771 do_complete(qp, wqe);
772 rxe_qp_error(qp);
c1cc72cb
YC		 773
774 if (pkt) {
775 rxe_drop_ref(pkt->qp);
776 kfree_skb(skb);
c5540a01 777 skb = NULL;
c1cc72cb
YC		 778 }
779
8700e3e7
MS		 780 goto exit;
781 }
782 }
783
784exit:
785 /* we come here if we are done with processing and want the task to
786 * exit from the loop calling us
787 */
c5540a01 788 WARN_ON_ONCE(skb);
37f69f43 789 rxe_drop_ref(qp);
8700e3e7
MS		 790 return -EAGAIN;
791
792done:
793 /* we come here if we have processed a packet we want the task to call
794 * us again to see if there is anything else to do
795 */
c5540a01 796 WARN_ON_ONCE(skb);
37f69f43 797 rxe_drop_ref(qp);
8700e3e7
MS		 798 return 0;
799}
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