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7#include <linux/skbuff.h>
8#include <crypto/hash.h>
9
10#include "rxe.h"
11#include "rxe_loc.h"
12#include "rxe_queue.h"
13
14static int next_opcode(struct rxe_qp *qp, struct rxe_send_wqe *wqe,
15 u32 opcode);
16
17static inline void retry_first_write_send(struct rxe_qp *qp,
18 struct rxe_send_wqe *wqe,
19 unsigned int mask, int npsn)
20{
21 int i;
22
23 for (i = 0; i < npsn; i++) {
24 int to_send = (wqe->dma.resid > qp->mtu) ?
25 qp->mtu : wqe->dma.resid;
26
27 qp->req.opcode = next_opcode(qp, wqe,
28 wqe->wr.opcode);
29
30 if (wqe->wr.send_flags & IB_SEND_INLINE) {
31 wqe->dma.resid -= to_send;
32 wqe->dma.sge_offset += to_send;
33 } else {
34 advance_dma_data(&wqe->dma, to_send);
35 }
36 if (mask & WR_WRITE_MASK)
37 wqe->iova += qp->mtu;
38 }
39}
40
41static void req_retry(struct rxe_qp *qp)
42{
43 struct rxe_send_wqe *wqe;
44 unsigned int wqe_index;
45 unsigned int mask;
46 int npsn;
47 int first = 1;
48 struct rxe_queue *q = qp->sq.queue;
49 unsigned int cons;
50 unsigned int prod;
51
52 if (qp->is_user) {
53 cons = consumer_index(q, QUEUE_TYPE_FROM_USER);
54 prod = producer_index(q, QUEUE_TYPE_FROM_USER);
55 } else {
56 cons = consumer_index(q, QUEUE_TYPE_KERNEL);
57 prod = producer_index(q, QUEUE_TYPE_KERNEL);
58 }
59
60 qp->req.wqe_index = cons;
61 qp->req.psn = qp->comp.psn;
62 qp->req.opcode = -1;
63
64 for (wqe_index = cons; wqe_index != prod;
65 wqe_index = next_index(q, wqe_index)) {
66 wqe = addr_from_index(qp->sq.queue, wqe_index);
67 mask = wr_opcode_mask(wqe->wr.opcode, qp);
68
69 if (wqe->state == wqe_state_posted)
70 break;
71
72 if (wqe->state == wqe_state_done)
73 continue;
74
75 wqe->iova = (mask & WR_ATOMIC_MASK) ?
76 wqe->wr.wr.atomic.remote_addr :
77 (mask & WR_READ_OR_WRITE_MASK) ?
78 wqe->wr.wr.rdma.remote_addr :
79 0;
80
81 if (!first || (mask & WR_READ_MASK) == 0) {
82 wqe->dma.resid = wqe->dma.length;
83 wqe->dma.cur_sge = 0;
84 wqe->dma.sge_offset = 0;
85 }
86
87 if (first) {
88 first = 0;
89
90 if (mask & WR_WRITE_OR_SEND_MASK) {
91 npsn = (qp->comp.psn - wqe->first_psn) &
92 BTH_PSN_MASK;
93 retry_first_write_send(qp, wqe, mask, npsn);
94 }
95
96 if (mask & WR_READ_MASK) {
97 npsn = (wqe->dma.length - wqe->dma.resid) /
98 qp->mtu;
99 wqe->iova += npsn * qp->mtu;
100 }
101 }
102
103 wqe->state = wqe_state_posted;
104 }
105}
106
107void rnr_nak_timer(struct timer_list *t)
108{
109 struct rxe_qp *qp = from_timer(qp, t, rnr_nak_timer);
110
111 pr_debug("qp#%d rnr nak timer fired\n", qp_num(qp));
112 rxe_run_task(&qp->req.task, 1);
113}
114
115static struct rxe_send_wqe *req_next_wqe(struct rxe_qp *qp)
116{
117 struct rxe_send_wqe *wqe;
118 unsigned long flags;
119 struct rxe_queue *q = qp->sq.queue;
120 unsigned int index = qp->req.wqe_index;
121 unsigned int cons;
122 unsigned int prod;
123
124 if (qp->is_user) {
125 wqe = queue_head(q, QUEUE_TYPE_FROM_USER);
126 cons = consumer_index(q, QUEUE_TYPE_FROM_USER);
127 prod = producer_index(q, QUEUE_TYPE_FROM_USER);
128 } else {
129 wqe = queue_head(q, QUEUE_TYPE_KERNEL);
130 cons = consumer_index(q, QUEUE_TYPE_KERNEL);
131 prod = producer_index(q, QUEUE_TYPE_KERNEL);
132 }
133
134 if (unlikely(qp->req.state == QP_STATE_DRAIN)) {
135
136
137
138 spin_lock_irqsave(&qp->state_lock, flags);
139 do {
140 if (qp->req.state != QP_STATE_DRAIN) {
141
142 spin_unlock_irqrestore(&qp->state_lock,
143 flags);
144 break;
145 }
146
147 if (wqe && ((index != cons) ||
148 (wqe->state != wqe_state_posted))) {
149
150 spin_unlock_irqrestore(&qp->state_lock,
151 flags);
152 break;
153 }
154
155 qp->req.state = QP_STATE_DRAINED;
156 spin_unlock_irqrestore(&qp->state_lock, flags);
157
158 if (qp->ibqp.event_handler) {
159 struct ib_event ev;
160
161 ev.device = qp->ibqp.device;
162 ev.element.qp = &qp->ibqp;
163 ev.event = IB_EVENT_SQ_DRAINED;
164 qp->ibqp.event_handler(&ev,
165 qp->ibqp.qp_context);
166 }
167 } while (0);
168 }
169
170 if (index == prod)
171 return NULL;
172
173 wqe = addr_from_index(q, index);
174
175 if (unlikely((qp->req.state == QP_STATE_DRAIN ||
176 qp->req.state == QP_STATE_DRAINED) &&
177 (wqe->state != wqe_state_processing)))
178 return NULL;
179
180 if (unlikely((wqe->wr.send_flags & IB_SEND_FENCE) &&
181 (index != cons))) {
182 qp->req.wait_fence = 1;
183 return NULL;
184 }
185
186 wqe->mask = wr_opcode_mask(wqe->wr.opcode, qp);
187 return wqe;
188}
189
190static int next_opcode_rc(struct rxe_qp *qp, u32 opcode, int fits)
191{
192 switch (opcode) {
193 case IB_WR_RDMA_WRITE:
194 if (qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_FIRST ||
195 qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_MIDDLE)
196 return fits ?
197 IB_OPCODE_RC_RDMA_WRITE_LAST :
198 IB_OPCODE_RC_RDMA_WRITE_MIDDLE;
199 else
200 return fits ?
201 IB_OPCODE_RC_RDMA_WRITE_ONLY :
202 IB_OPCODE_RC_RDMA_WRITE_FIRST;
203
204 case IB_WR_RDMA_WRITE_WITH_IMM:
205 if (qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_FIRST ||
206 qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_MIDDLE)
207 return fits ?
208 IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE :
209 IB_OPCODE_RC_RDMA_WRITE_MIDDLE;
210 else
211 return fits ?
212 IB_OPCODE_RC_RDMA_WRITE_ONLY_WITH_IMMEDIATE :
213 IB_OPCODE_RC_RDMA_WRITE_FIRST;
214
215 case IB_WR_SEND:
216 if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST ||
217 qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE)
218 return fits ?
219 IB_OPCODE_RC_SEND_LAST :
220 IB_OPCODE_RC_SEND_MIDDLE;
221 else
222 return fits ?
223 IB_OPCODE_RC_SEND_ONLY :
224 IB_OPCODE_RC_SEND_FIRST;
225
226 case IB_WR_SEND_WITH_IMM:
227 if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST ||
228 qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE)
229 return fits ?
230 IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE :
231 IB_OPCODE_RC_SEND_MIDDLE;
232 else
233 return fits ?
234 IB_OPCODE_RC_SEND_ONLY_WITH_IMMEDIATE :
235 IB_OPCODE_RC_SEND_FIRST;
236
237 case IB_WR_RDMA_READ:
238 return IB_OPCODE_RC_RDMA_READ_REQUEST;
239
240 case IB_WR_ATOMIC_CMP_AND_SWP:
241 return IB_OPCODE_RC_COMPARE_SWAP;
242
243 case IB_WR_ATOMIC_FETCH_AND_ADD:
244 return IB_OPCODE_RC_FETCH_ADD;
245
246 case IB_WR_SEND_WITH_INV:
247 if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST ||
248 qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE)
249 return fits ? IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE :
250 IB_OPCODE_RC_SEND_MIDDLE;
251 else
252 return fits ? IB_OPCODE_RC_SEND_ONLY_WITH_INVALIDATE :
253 IB_OPCODE_RC_SEND_FIRST;
254 case IB_WR_REG_MR:
255 case IB_WR_LOCAL_INV:
256 return opcode;
257 }
258
259 return -EINVAL;
260}
261
262static int next_opcode_uc(struct rxe_qp *qp, u32 opcode, int fits)
263{
264 switch (opcode) {
265 case IB_WR_RDMA_WRITE:
266 if (qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_FIRST ||
267 qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_MIDDLE)
268 return fits ?
269 IB_OPCODE_UC_RDMA_WRITE_LAST :
270 IB_OPCODE_UC_RDMA_WRITE_MIDDLE;
271 else
272 return fits ?
273 IB_OPCODE_UC_RDMA_WRITE_ONLY :
274 IB_OPCODE_UC_RDMA_WRITE_FIRST;
275
276 case IB_WR_RDMA_WRITE_WITH_IMM:
277 if (qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_FIRST ||
278 qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_MIDDLE)
279 return fits ?
280 IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE :
281 IB_OPCODE_UC_RDMA_WRITE_MIDDLE;
282 else
283 return fits ?
284 IB_OPCODE_UC_RDMA_WRITE_ONLY_WITH_IMMEDIATE :
285 IB_OPCODE_UC_RDMA_WRITE_FIRST;
286
287 case IB_WR_SEND:
288 if (qp->req.opcode == IB_OPCODE_UC_SEND_FIRST ||
289 qp->req.opcode == IB_OPCODE_UC_SEND_MIDDLE)
290 return fits ?
291 IB_OPCODE_UC_SEND_LAST :
292 IB_OPCODE_UC_SEND_MIDDLE;
293 else
294 return fits ?
295 IB_OPCODE_UC_SEND_ONLY :
296 IB_OPCODE_UC_SEND_FIRST;
297
298 case IB_WR_SEND_WITH_IMM:
299 if (qp->req.opcode == IB_OPCODE_UC_SEND_FIRST ||
300 qp->req.opcode == IB_OPCODE_UC_SEND_MIDDLE)
301 return fits ?
302 IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE :
303 IB_OPCODE_UC_SEND_MIDDLE;
304 else
305 return fits ?
306 IB_OPCODE_UC_SEND_ONLY_WITH_IMMEDIATE :
307 IB_OPCODE_UC_SEND_FIRST;
308 }
309
310 return -EINVAL;
311}
312
313static int next_opcode(struct rxe_qp *qp, struct rxe_send_wqe *wqe,
314 u32 opcode)
315{
316 int fits = (wqe->dma.resid <= qp->mtu);
317
318 switch (qp_type(qp)) {
319 case IB_QPT_RC:
320 return next_opcode_rc(qp, opcode, fits);
321
322 case IB_QPT_UC:
323 return next_opcode_uc(qp, opcode, fits);
324
325 case IB_QPT_SMI:
326 case IB_QPT_UD:
327 case IB_QPT_GSI:
328 switch (opcode) {
329 case IB_WR_SEND:
330 return IB_OPCODE_UD_SEND_ONLY;
331
332 case IB_WR_SEND_WITH_IMM:
333 return IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE;
334 }
335 break;
336
337 default:
338 break;
339 }
340
341 return -EINVAL;
342}
343
344static inline int check_init_depth(struct rxe_qp *qp, struct rxe_send_wqe *wqe)
345{
346 int depth;
347
348 if (wqe->has_rd_atomic)
349 return 0;
350
351 qp->req.need_rd_atomic = 1;
352 depth = atomic_dec_return(&qp->req.rd_atomic);
353
354 if (depth >= 0) {
355 qp->req.need_rd_atomic = 0;
356 wqe->has_rd_atomic = 1;
357 return 0;
358 }
359
360 atomic_inc(&qp->req.rd_atomic);
361 return -EAGAIN;
362}
363
364static inline int get_mtu(struct rxe_qp *qp)
365{
366 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
367
368 if ((qp_type(qp) == IB_QPT_RC) || (qp_type(qp) == IB_QPT_UC))
369 return qp->mtu;
370
371 return rxe->port.mtu_cap;
372}
373
374static struct sk_buff *init_req_packet(struct rxe_qp *qp,
375 struct rxe_send_wqe *wqe,
376 int opcode, int payload,
377 struct rxe_pkt_info *pkt)
378{
379 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
380 struct sk_buff *skb;
381 struct rxe_send_wr *ibwr = &wqe->wr;
382 struct rxe_av *av;
383 int pad = (-payload) & 0x3;
384 int paylen;
385 int solicited;
386 u16 pkey;
387 u32 qp_num;
388 int ack_req;
389
390
391 paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE;
392
393
394
395
396 pkt->opcode = opcode;
397 pkt->qp = qp;
398 pkt->psn = qp->req.psn;
399 pkt->mask = rxe_opcode[opcode].mask;
400 pkt->paylen = paylen;
401 pkt->wqe = wqe;
402
403
404 av = rxe_get_av(pkt);
405 skb = rxe_init_packet(rxe, av, paylen, pkt);
406 if (unlikely(!skb))
407 return NULL;
408
409
410 solicited = (ibwr->send_flags & IB_SEND_SOLICITED) &&
411 (pkt->mask & RXE_END_MASK) &&
412 ((pkt->mask & (RXE_SEND_MASK)) ||
413 (pkt->mask & (RXE_WRITE_MASK | RXE_IMMDT_MASK)) ==
414 (RXE_WRITE_MASK | RXE_IMMDT_MASK));
415
416 pkey = IB_DEFAULT_PKEY_FULL;
417
418 qp_num = (pkt->mask & RXE_DETH_MASK) ? ibwr->wr.ud.remote_qpn :
419 qp->attr.dest_qp_num;
420
421 ack_req = ((pkt->mask & RXE_END_MASK) ||
422 (qp->req.noack_pkts++ > RXE_MAX_PKT_PER_ACK));
423 if (ack_req)
424 qp->req.noack_pkts = 0;
425
426 bth_init(pkt, pkt->opcode, solicited, 0, pad, pkey, qp_num,
427 ack_req, pkt->psn);
428
429
430 if (pkt->mask & RXE_RETH_MASK) {
431 reth_set_rkey(pkt, ibwr->wr.rdma.rkey);
432 reth_set_va(pkt, wqe->iova);
433 reth_set_len(pkt, wqe->dma.resid);
434 }
435
436 if (pkt->mask & RXE_IMMDT_MASK)
437 immdt_set_imm(pkt, ibwr->ex.imm_data);
438
439 if (pkt->mask & RXE_IETH_MASK)
440 ieth_set_rkey(pkt, ibwr->ex.invalidate_rkey);
441
442 if (pkt->mask & RXE_ATMETH_MASK) {
443 atmeth_set_va(pkt, wqe->iova);
444 if (opcode == IB_OPCODE_RC_COMPARE_SWAP ||
445 opcode == IB_OPCODE_RD_COMPARE_SWAP) {
446 atmeth_set_swap_add(pkt, ibwr->wr.atomic.swap);
447 atmeth_set_comp(pkt, ibwr->wr.atomic.compare_add);
448 } else {
449 atmeth_set_swap_add(pkt, ibwr->wr.atomic.compare_add);
450 }
451 atmeth_set_rkey(pkt, ibwr->wr.atomic.rkey);
452 }
453
454 if (pkt->mask & RXE_DETH_MASK) {
455 if (qp->ibqp.qp_num == 1)
456 deth_set_qkey(pkt, GSI_QKEY);
457 else
458 deth_set_qkey(pkt, ibwr->wr.ud.remote_qkey);
459 deth_set_sqp(pkt, qp->ibqp.qp_num);
460 }
461
462 return skb;
463}
464
465static int finish_packet(struct rxe_qp *qp, struct rxe_send_wqe *wqe,
466 struct rxe_pkt_info *pkt, struct sk_buff *skb,
467 int paylen)
468{
469 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
470 u32 crc = 0;
471 u32 *p;
472 int err;
473
474 err = rxe_prepare(pkt, skb, &crc);
475 if (err)
476 return err;
477
478 if (pkt->mask & RXE_WRITE_OR_SEND) {
479 if (wqe->wr.send_flags & IB_SEND_INLINE) {
480 u8 *tmp = &wqe->dma.inline_data[wqe->dma.sge_offset];
481
482 crc = rxe_crc32(rxe, crc, tmp, paylen);
483 memcpy(payload_addr(pkt), tmp, paylen);
484
485 wqe->dma.resid -= paylen;
486 wqe->dma.sge_offset += paylen;
487 } else {
488 err = copy_data(qp->pd, 0, &wqe->dma,
489 payload_addr(pkt), paylen,
490 RXE_FROM_MR_OBJ,
491 &crc);
492 if (err)
493 return err;
494 }
495 if (bth_pad(pkt)) {
496 u8 *pad = payload_addr(pkt) + paylen;
497
498 memset(pad, 0, bth_pad(pkt));
499 crc = rxe_crc32(rxe, crc, pad, bth_pad(pkt));
500 }
501 }
502 p = payload_addr(pkt) + paylen + bth_pad(pkt);
503
504 *p = ~crc;
505
506 return 0;
507}
508
509static void update_wqe_state(struct rxe_qp *qp,
510 struct rxe_send_wqe *wqe,
511 struct rxe_pkt_info *pkt)
512{
513 if (pkt->mask & RXE_END_MASK) {
514 if (qp_type(qp) == IB_QPT_RC)
515 wqe->state = wqe_state_pending;
516 } else {
517 wqe->state = wqe_state_processing;
518 }
519}
520
521static void update_wqe_psn(struct rxe_qp *qp,
522 struct rxe_send_wqe *wqe,
523 struct rxe_pkt_info *pkt,
524 int payload)
525{
526
527 int num_pkt = (wqe->dma.resid + payload + qp->mtu - 1) / qp->mtu;
528
529
530 if (num_pkt == 0)
531 num_pkt = 1;
532
533 if (pkt->mask & RXE_START_MASK) {
534 wqe->first_psn = qp->req.psn;
535 wqe->last_psn = (qp->req.psn + num_pkt - 1) & BTH_PSN_MASK;
536 }
537
538 if (pkt->mask & RXE_READ_MASK)
539 qp->req.psn = (wqe->first_psn + num_pkt) & BTH_PSN_MASK;
540 else
541 qp->req.psn = (qp->req.psn + 1) & BTH_PSN_MASK;
542}
543
544static void save_state(struct rxe_send_wqe *wqe,
545 struct rxe_qp *qp,
546 struct rxe_send_wqe *rollback_wqe,
547 u32 *rollback_psn)
548{
549 rollback_wqe->state = wqe->state;
550 rollback_wqe->first_psn = wqe->first_psn;
551 rollback_wqe->last_psn = wqe->last_psn;
552 *rollback_psn = qp->req.psn;
553}
554
555static void rollback_state(struct rxe_send_wqe *wqe,
556 struct rxe_qp *qp,
557 struct rxe_send_wqe *rollback_wqe,
558 u32 rollback_psn)
559{
560 wqe->state = rollback_wqe->state;
561 wqe->first_psn = rollback_wqe->first_psn;
562 wqe->last_psn = rollback_wqe->last_psn;
563 qp->req.psn = rollback_psn;
564}
565
566static void update_state(struct rxe_qp *qp, struct rxe_send_wqe *wqe,
567 struct rxe_pkt_info *pkt, int payload)
568{
569 qp->req.opcode = pkt->opcode;
570
571 if (pkt->mask & RXE_END_MASK)
572 qp->req.wqe_index = next_index(qp->sq.queue, qp->req.wqe_index);
573
574 qp->need_req_skb = 0;
575
576 if (qp->qp_timeout_jiffies && !timer_pending(&qp->retrans_timer))
577 mod_timer(&qp->retrans_timer,
578 jiffies + qp->qp_timeout_jiffies);
579}
580
581static int rxe_do_local_ops(struct rxe_qp *qp, struct rxe_send_wqe *wqe)
582{
583 u8 opcode = wqe->wr.opcode;
584 struct rxe_mr *mr;
585 u32 rkey;
586 int ret;
587
588 switch (opcode) {
589 case IB_WR_LOCAL_INV:
590 rkey = wqe->wr.ex.invalidate_rkey;
591 if (rkey_is_mw(rkey))
592 ret = rxe_invalidate_mw(qp, rkey);
593 else
594 ret = rxe_invalidate_mr(qp, rkey);
595
596 if (unlikely(ret)) {
597 wqe->status = IB_WC_LOC_QP_OP_ERR;
598 return ret;
599 }
600 break;
601 case IB_WR_REG_MR:
602 mr = to_rmr(wqe->wr.wr.reg.mr);
603 rxe_add_ref(mr);
604 mr->state = RXE_MR_STATE_VALID;
605 mr->access = wqe->wr.wr.reg.access;
606 mr->ibmr.lkey = wqe->wr.wr.reg.key;
607 mr->ibmr.rkey = wqe->wr.wr.reg.key;
608 mr->iova = wqe->wr.wr.reg.mr->iova;
609 rxe_drop_ref(mr);
610 break;
611 case IB_WR_BIND_MW:
612 ret = rxe_bind_mw(qp, wqe);
613 if (unlikely(ret)) {
614 wqe->status = IB_WC_MW_BIND_ERR;
615 return ret;
616 }
617 break;
618 default:
619 pr_err("Unexpected send wqe opcode %d\n", opcode);
620 wqe->status = IB_WC_LOC_QP_OP_ERR;
621 return -EINVAL;
622 }
623
624 wqe->state = wqe_state_done;
625 wqe->status = IB_WC_SUCCESS;
626 qp->req.wqe_index = next_index(qp->sq.queue, qp->req.wqe_index);
627
628 if ((wqe->wr.send_flags & IB_SEND_SIGNALED) ||
629 qp->sq_sig_type == IB_SIGNAL_ALL_WR)
630 rxe_run_task(&qp->comp.task, 1);
631
632 return 0;
633}
634
635int rxe_requester(void *arg)
636{
637 struct rxe_qp *qp = (struct rxe_qp *)arg;
638 struct rxe_pkt_info pkt;
639 struct sk_buff *skb;
640 struct rxe_send_wqe *wqe;
641 enum rxe_hdr_mask mask;
642 int payload;
643 int mtu;
644 int opcode;
645 int ret;
646 struct rxe_send_wqe rollback_wqe;
647 u32 rollback_psn;
648 struct rxe_queue *q = qp->sq.queue;
649
650 rxe_add_ref(qp);
651
652next_wqe:
653 if (unlikely(!qp->valid || qp->req.state == QP_STATE_ERROR))
654 goto exit;
655
656 if (unlikely(qp->req.state == QP_STATE_RESET)) {
657 qp->req.wqe_index = consumer_index(q, q->type);
658 qp->req.opcode = -1;
659 qp->req.need_rd_atomic = 0;
660 qp->req.wait_psn = 0;
661 qp->req.need_retry = 0;
662 goto exit;
663 }
664
665 if (unlikely(qp->req.need_retry)) {
666 req_retry(qp);
667 qp->req.need_retry = 0;
668 }
669
670 wqe = req_next_wqe(qp);
671 if (unlikely(!wqe))
672 goto exit;
673
674 if (wqe->mask & WR_LOCAL_OP_MASK) {
675 ret = rxe_do_local_ops(qp, wqe);
676 if (unlikely(ret))
677 goto err;
678 else
679 goto next_wqe;
680 }
681
682 if (unlikely(qp_type(qp) == IB_QPT_RC &&
683 psn_compare(qp->req.psn, (qp->comp.psn +
684 RXE_MAX_UNACKED_PSNS)) > 0)) {
685 qp->req.wait_psn = 1;
686 goto exit;
687 }
688
689
690 if (unlikely(atomic_read(&qp->skb_out) >
691 RXE_INFLIGHT_SKBS_PER_QP_HIGH)) {
692 qp->need_req_skb = 1;
693 goto exit;
694 }
695
696 opcode = next_opcode(qp, wqe, wqe->wr.opcode);
697 if (unlikely(opcode < 0)) {
698 wqe->status = IB_WC_LOC_QP_OP_ERR;
699 goto exit;
700 }
701
702 mask = rxe_opcode[opcode].mask;
703 if (unlikely(mask & RXE_READ_OR_ATOMIC)) {
704 if (check_init_depth(qp, wqe))
705 goto exit;
706 }
707
708 mtu = get_mtu(qp);
709 payload = (mask & RXE_WRITE_OR_SEND) ? wqe->dma.resid : 0;
710 if (payload > mtu) {
711 if (qp_type(qp) == IB_QPT_UD) {
712
713
714
715
716
717
718
719 wqe->first_psn = qp->req.psn;
720 wqe->last_psn = qp->req.psn;
721 qp->req.psn = (qp->req.psn + 1) & BTH_PSN_MASK;
722 qp->req.opcode = IB_OPCODE_UD_SEND_ONLY;
723 qp->req.wqe_index = next_index(qp->sq.queue,
724 qp->req.wqe_index);
725 wqe->state = wqe_state_done;
726 wqe->status = IB_WC_SUCCESS;
727 __rxe_do_task(&qp->comp.task);
728 rxe_drop_ref(qp);
729 return 0;
730 }
731 payload = mtu;
732 }
733
734 skb = init_req_packet(qp, wqe, opcode, payload, &pkt);
735 if (unlikely(!skb)) {
736 pr_err("qp#%d Failed allocating skb\n", qp_num(qp));
737 wqe->status = IB_WC_LOC_QP_OP_ERR;
738 goto err;
739 }
740
741 ret = finish_packet(qp, wqe, &pkt, skb, payload);
742 if (unlikely(ret)) {
743 pr_debug("qp#%d Error during finish packet\n", qp_num(qp));
744 if (ret == -EFAULT)
745 wqe->status = IB_WC_LOC_PROT_ERR;
746 else
747 wqe->status = IB_WC_LOC_QP_OP_ERR;
748 kfree_skb(skb);
749 goto err;
750 }
751
752
753
754
755
756
757
758 save_state(wqe, qp, &rollback_wqe, &rollback_psn);
759 update_wqe_state(qp, wqe, &pkt);
760 update_wqe_psn(qp, wqe, &pkt, payload);
761 ret = rxe_xmit_packet(qp, &pkt, skb);
762 if (ret) {
763 qp->need_req_skb = 1;
764
765 rollback_state(wqe, qp, &rollback_wqe, rollback_psn);
766
767 if (ret == -EAGAIN) {
768 rxe_run_task(&qp->req.task, 1);
769 goto exit;
770 }
771
772 wqe->status = IB_WC_LOC_QP_OP_ERR;
773 goto err;
774 }
775
776 update_state(qp, wqe, &pkt, payload);
777
778 goto next_wqe;
779
780err:
781 wqe->state = wqe_state_error;
782 __rxe_do_task(&qp->comp.task);
783
784exit:
785 rxe_drop_ref(qp);
786 return -EAGAIN;
787}
788
