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 #include <crypto/hash.h>
9
10 #include "rxe.h"
11 #include "rxe_loc.h"
12 #include "rxe_queue.h"
13
14 static int next_opcode(struct rxe_qp *qp, struct rxe_send_wqe *wqe,
15 u32 opcode);
16
retry_first_write_send(struct rxe_qp * qp,struct rxe_send_wqe * wqe,int npsn)17 static inline void retry_first_write_send(struct rxe_qp *qp,
18 struct rxe_send_wqe *wqe, int npsn)
19 {
20 int i;
21
22 for (i = 0; i < npsn; i++) {
23 int to_send = (wqe->dma.resid > qp->mtu) ?
24 qp->mtu : wqe->dma.resid;
25
26 qp->req.opcode = next_opcode(qp, wqe,
27 wqe->wr.opcode);
28
29 if (wqe->wr.send_flags & IB_SEND_INLINE) {
30 wqe->dma.resid -= to_send;
31 wqe->dma.sge_offset += to_send;
32 } else {
33 advance_dma_data(&wqe->dma, to_send);
34 }
35 }
36 }
37
req_retry(struct rxe_qp * qp)38 static void req_retry(struct rxe_qp *qp)
39 {
40 struct rxe_send_wqe *wqe;
41 unsigned int wqe_index;
42 unsigned int mask;
43 int npsn;
44 int first = 1;
45 struct rxe_queue *q = qp->sq.queue;
46 unsigned int cons;
47 unsigned int prod;
48
49 cons = queue_get_consumer(q, QUEUE_TYPE_FROM_CLIENT);
50 prod = queue_get_producer(q, QUEUE_TYPE_FROM_CLIENT);
51
52 qp->req.wqe_index = cons;
53 qp->req.psn = qp->comp.psn;
54 qp->req.opcode = -1;
55
56 for (wqe_index = cons; wqe_index != prod;
57 wqe_index = queue_next_index(q, wqe_index)) {
58 wqe = queue_addr_from_index(qp->sq.queue, wqe_index);
59 mask = wr_opcode_mask(wqe->wr.opcode, qp);
60
61 if (wqe->state == wqe_state_posted)
62 break;
63
64 if (wqe->state == wqe_state_done)
65 continue;
66
67 wqe->iova = (mask & WR_ATOMIC_MASK) ?
68 wqe->wr.wr.atomic.remote_addr :
69 (mask & WR_READ_OR_WRITE_MASK) ?
70 wqe->wr.wr.rdma.remote_addr :
71 0;
72
73 if (!first || (mask & WR_READ_MASK) == 0) {
74 wqe->dma.resid = wqe->dma.length;
75 wqe->dma.cur_sge = 0;
76 wqe->dma.sge_offset = 0;
77 }
78
79 if (first) {
80 first = 0;
81
82 if (mask & WR_WRITE_OR_SEND_MASK) {
83 npsn = (qp->comp.psn - wqe->first_psn) &
84 BTH_PSN_MASK;
85 retry_first_write_send(qp, wqe, npsn);
86 }
87
88 if (mask & WR_READ_MASK) {
89 npsn = (wqe->dma.length - wqe->dma.resid) /
90 qp->mtu;
91 wqe->iova += npsn * qp->mtu;
92 }
93 }
94
95 wqe->state = wqe_state_posted;
96 }
97 }
98
rnr_nak_timer(struct timer_list * t)99 void rnr_nak_timer(struct timer_list *t)
100 {
101 struct rxe_qp *qp = from_timer(qp, t, rnr_nak_timer);
102 unsigned long flags;
103
104 rxe_dbg_qp(qp, "nak timer fired\n");
105
106 spin_lock_irqsave(&qp->state_lock, flags);
107 if (qp->valid) {
108 /* request a send queue retry */
109 qp->req.need_retry = 1;
110 qp->req.wait_for_rnr_timer = 0;
111 rxe_sched_task(&qp->req.task);
112 }
113 spin_unlock_irqrestore(&qp->state_lock, flags);
114 }
115
req_check_sq_drain_done(struct rxe_qp * qp)116 static void req_check_sq_drain_done(struct rxe_qp *qp)
117 {
118 struct rxe_queue *q;
119 unsigned int index;
120 unsigned int cons;
121 struct rxe_send_wqe *wqe;
122 unsigned long flags;
123
124 spin_lock_irqsave(&qp->state_lock, flags);
125 if (qp_state(qp) == IB_QPS_SQD) {
126 q = qp->sq.queue;
127 index = qp->req.wqe_index;
128 cons = queue_get_consumer(q, QUEUE_TYPE_FROM_CLIENT);
129 wqe = queue_addr_from_index(q, cons);
130
131 /* check to see if we are drained;
132 * state_lock used by requester and completer
133 */
134 do {
135 if (!qp->attr.sq_draining)
136 /* comp just finished */
137 break;
138
139 if (wqe && ((index != cons) ||
140 (wqe->state != wqe_state_posted)))
141 /* comp not done yet */
142 break;
143
144 qp->attr.sq_draining = 0;
145 spin_unlock_irqrestore(&qp->state_lock, flags);
146
147 if (qp->ibqp.event_handler) {
148 struct ib_event ev;
149
150 ev.device = qp->ibqp.device;
151 ev.element.qp = &qp->ibqp;
152 ev.event = IB_EVENT_SQ_DRAINED;
153 qp->ibqp.event_handler(&ev,
154 qp->ibqp.qp_context);
155 }
156 return;
157 } while (0);
158 }
159 spin_unlock_irqrestore(&qp->state_lock, flags);
160 }
161
__req_next_wqe(struct rxe_qp * qp)162 static struct rxe_send_wqe *__req_next_wqe(struct rxe_qp *qp)
163 {
164 struct rxe_queue *q = qp->sq.queue;
165 unsigned int index = qp->req.wqe_index;
166 unsigned int prod;
167
168 prod = queue_get_producer(q, QUEUE_TYPE_FROM_CLIENT);
169 if (index == prod)
170 return NULL;
171 else
172 return queue_addr_from_index(q, index);
173 }
174
req_next_wqe(struct rxe_qp * qp)175 static struct rxe_send_wqe *req_next_wqe(struct rxe_qp *qp)
176 {
177 struct rxe_send_wqe *wqe;
178 unsigned long flags;
179
180 req_check_sq_drain_done(qp);
181
182 wqe = __req_next_wqe(qp);
183 if (wqe == NULL)
184 return NULL;
185
186 spin_lock_irqsave(&qp->state_lock, flags);
187 if (unlikely((qp_state(qp) == IB_QPS_SQD) &&
188 (wqe->state != wqe_state_processing))) {
189 spin_unlock_irqrestore(&qp->state_lock, flags);
190 return NULL;
191 }
192 spin_unlock_irqrestore(&qp->state_lock, flags);
193
194 wqe->mask = wr_opcode_mask(wqe->wr.opcode, qp);
195 return wqe;
196 }
197
198 /**
199 * rxe_wqe_is_fenced - check if next wqe is fenced
200 * @qp: the queue pair
201 * @wqe: the next wqe
202 *
203 * Returns: 1 if wqe needs to wait
204 * 0 if wqe is ready to go
205 */
rxe_wqe_is_fenced(struct rxe_qp * qp,struct rxe_send_wqe * wqe)206 static int rxe_wqe_is_fenced(struct rxe_qp *qp, struct rxe_send_wqe *wqe)
207 {
208 /* Local invalidate fence (LIF) see IBA 10.6.5.1
209 * Requires ALL previous operations on the send queue
210 * are complete. Make mandatory for the rxe driver.
211 */
212 if (wqe->wr.opcode == IB_WR_LOCAL_INV)
213 return qp->req.wqe_index != queue_get_consumer(qp->sq.queue,
214 QUEUE_TYPE_FROM_CLIENT);
215
216 /* Fence see IBA 10.8.3.3
217 * Requires that all previous read and atomic operations
218 * are complete.
219 */
220 return (wqe->wr.send_flags & IB_SEND_FENCE) &&
221 atomic_read(&qp->req.rd_atomic) != qp->attr.max_rd_atomic;
222 }
223
next_opcode_rc(struct rxe_qp * qp,u32 opcode,int fits)224 static int next_opcode_rc(struct rxe_qp *qp, u32 opcode, int fits)
225 {
226 switch (opcode) {
227 case IB_WR_RDMA_WRITE:
228 if (qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_FIRST ||
229 qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_MIDDLE)
230 return fits ?
231 IB_OPCODE_RC_RDMA_WRITE_LAST :
232 IB_OPCODE_RC_RDMA_WRITE_MIDDLE;
233 else
234 return fits ?
235 IB_OPCODE_RC_RDMA_WRITE_ONLY :
236 IB_OPCODE_RC_RDMA_WRITE_FIRST;
237
238 case IB_WR_RDMA_WRITE_WITH_IMM:
239 if (qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_FIRST ||
240 qp->req.opcode == IB_OPCODE_RC_RDMA_WRITE_MIDDLE)
241 return fits ?
242 IB_OPCODE_RC_RDMA_WRITE_LAST_WITH_IMMEDIATE :
243 IB_OPCODE_RC_RDMA_WRITE_MIDDLE;
244 else
245 return fits ?
246 IB_OPCODE_RC_RDMA_WRITE_ONLY_WITH_IMMEDIATE :
247 IB_OPCODE_RC_RDMA_WRITE_FIRST;
248
249 case IB_WR_SEND:
250 if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST ||
251 qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE)
252 return fits ?
253 IB_OPCODE_RC_SEND_LAST :
254 IB_OPCODE_RC_SEND_MIDDLE;
255 else
256 return fits ?
257 IB_OPCODE_RC_SEND_ONLY :
258 IB_OPCODE_RC_SEND_FIRST;
259
260 case IB_WR_SEND_WITH_IMM:
261 if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST ||
262 qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE)
263 return fits ?
264 IB_OPCODE_RC_SEND_LAST_WITH_IMMEDIATE :
265 IB_OPCODE_RC_SEND_MIDDLE;
266 else
267 return fits ?
268 IB_OPCODE_RC_SEND_ONLY_WITH_IMMEDIATE :
269 IB_OPCODE_RC_SEND_FIRST;
270
271 case IB_WR_FLUSH:
272 return IB_OPCODE_RC_FLUSH;
273
274 case IB_WR_RDMA_READ:
275 return IB_OPCODE_RC_RDMA_READ_REQUEST;
276
277 case IB_WR_ATOMIC_CMP_AND_SWP:
278 return IB_OPCODE_RC_COMPARE_SWAP;
279
280 case IB_WR_ATOMIC_FETCH_AND_ADD:
281 return IB_OPCODE_RC_FETCH_ADD;
282
283 case IB_WR_SEND_WITH_INV:
284 if (qp->req.opcode == IB_OPCODE_RC_SEND_FIRST ||
285 qp->req.opcode == IB_OPCODE_RC_SEND_MIDDLE)
286 return fits ? IB_OPCODE_RC_SEND_LAST_WITH_INVALIDATE :
287 IB_OPCODE_RC_SEND_MIDDLE;
288 else
289 return fits ? IB_OPCODE_RC_SEND_ONLY_WITH_INVALIDATE :
290 IB_OPCODE_RC_SEND_FIRST;
291
292 case IB_WR_ATOMIC_WRITE:
293 return IB_OPCODE_RC_ATOMIC_WRITE;
294
295 case IB_WR_REG_MR:
296 case IB_WR_LOCAL_INV:
297 return opcode;
298 }
299
300 return -EINVAL;
301 }
302
next_opcode_uc(struct rxe_qp * qp,u32 opcode,int fits)303 static int next_opcode_uc(struct rxe_qp *qp, u32 opcode, int fits)
304 {
305 switch (opcode) {
306 case IB_WR_RDMA_WRITE:
307 if (qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_FIRST ||
308 qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_MIDDLE)
309 return fits ?
310 IB_OPCODE_UC_RDMA_WRITE_LAST :
311 IB_OPCODE_UC_RDMA_WRITE_MIDDLE;
312 else
313 return fits ?
314 IB_OPCODE_UC_RDMA_WRITE_ONLY :
315 IB_OPCODE_UC_RDMA_WRITE_FIRST;
316
317 case IB_WR_RDMA_WRITE_WITH_IMM:
318 if (qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_FIRST ||
319 qp->req.opcode == IB_OPCODE_UC_RDMA_WRITE_MIDDLE)
320 return fits ?
321 IB_OPCODE_UC_RDMA_WRITE_LAST_WITH_IMMEDIATE :
322 IB_OPCODE_UC_RDMA_WRITE_MIDDLE;
323 else
324 return fits ?
325 IB_OPCODE_UC_RDMA_WRITE_ONLY_WITH_IMMEDIATE :
326 IB_OPCODE_UC_RDMA_WRITE_FIRST;
327
328 case IB_WR_SEND:
329 if (qp->req.opcode == IB_OPCODE_UC_SEND_FIRST ||
330 qp->req.opcode == IB_OPCODE_UC_SEND_MIDDLE)
331 return fits ?
332 IB_OPCODE_UC_SEND_LAST :
333 IB_OPCODE_UC_SEND_MIDDLE;
334 else
335 return fits ?
336 IB_OPCODE_UC_SEND_ONLY :
337 IB_OPCODE_UC_SEND_FIRST;
338
339 case IB_WR_SEND_WITH_IMM:
340 if (qp->req.opcode == IB_OPCODE_UC_SEND_FIRST ||
341 qp->req.opcode == IB_OPCODE_UC_SEND_MIDDLE)
342 return fits ?
343 IB_OPCODE_UC_SEND_LAST_WITH_IMMEDIATE :
344 IB_OPCODE_UC_SEND_MIDDLE;
345 else
346 return fits ?
347 IB_OPCODE_UC_SEND_ONLY_WITH_IMMEDIATE :
348 IB_OPCODE_UC_SEND_FIRST;
349 }
350
351 return -EINVAL;
352 }
353
next_opcode(struct rxe_qp * qp,struct rxe_send_wqe * wqe,u32 opcode)354 static int next_opcode(struct rxe_qp *qp, struct rxe_send_wqe *wqe,
355 u32 opcode)
356 {
357 int fits = (wqe->dma.resid <= qp->mtu);
358
359 switch (qp_type(qp)) {
360 case IB_QPT_RC:
361 return next_opcode_rc(qp, opcode, fits);
362
363 case IB_QPT_UC:
364 return next_opcode_uc(qp, opcode, fits);
365
366 case IB_QPT_UD:
367 case IB_QPT_GSI:
368 switch (opcode) {
369 case IB_WR_SEND:
370 return IB_OPCODE_UD_SEND_ONLY;
371
372 case IB_WR_SEND_WITH_IMM:
373 return IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE;
374 }
375 break;
376
377 default:
378 break;
379 }
380
381 return -EINVAL;
382 }
383
check_init_depth(struct rxe_qp * qp,struct rxe_send_wqe * wqe)384 static inline int check_init_depth(struct rxe_qp *qp, struct rxe_send_wqe *wqe)
385 {
386 int depth;
387
388 if (wqe->has_rd_atomic)
389 return 0;
390
391 qp->req.need_rd_atomic = 1;
392 depth = atomic_dec_return(&qp->req.rd_atomic);
393
394 if (depth >= 0) {
395 qp->req.need_rd_atomic = 0;
396 wqe->has_rd_atomic = 1;
397 return 0;
398 }
399
400 atomic_inc(&qp->req.rd_atomic);
401 return -EAGAIN;
402 }
403
get_mtu(struct rxe_qp * qp)404 static inline int get_mtu(struct rxe_qp *qp)
405 {
406 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
407
408 if ((qp_type(qp) == IB_QPT_RC) || (qp_type(qp) == IB_QPT_UC))
409 return qp->mtu;
410
411 return rxe->port.mtu_cap;
412 }
413
init_req_packet(struct rxe_qp * qp,struct rxe_av * av,struct rxe_send_wqe * wqe,int opcode,u32 payload,struct rxe_pkt_info * pkt)414 static struct sk_buff *init_req_packet(struct rxe_qp *qp,
415 struct rxe_av *av,
416 struct rxe_send_wqe *wqe,
417 int opcode, u32 payload,
418 struct rxe_pkt_info *pkt)
419 {
420 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
421 struct sk_buff *skb;
422 struct rxe_send_wr *ibwr = &wqe->wr;
423 int pad = (-payload) & 0x3;
424 int paylen;
425 int solicited;
426 u32 qp_num;
427 int ack_req;
428
429 /* length from start of bth to end of icrc */
430 paylen = rxe_opcode[opcode].length + payload + pad + RXE_ICRC_SIZE;
431 pkt->paylen = paylen;
432
433 /* init skb */
434 skb = rxe_init_packet(rxe, av, paylen, pkt);
435 if (unlikely(!skb))
436 return NULL;
437
438 /* init bth */
439 solicited = (ibwr->send_flags & IB_SEND_SOLICITED) &&
440 (pkt->mask & RXE_END_MASK) &&
441 ((pkt->mask & (RXE_SEND_MASK)) ||
442 (pkt->mask & (RXE_WRITE_MASK | RXE_IMMDT_MASK)) ==
443 (RXE_WRITE_MASK | RXE_IMMDT_MASK));
444
445 qp_num = (pkt->mask & RXE_DETH_MASK) ? ibwr->wr.ud.remote_qpn :
446 qp->attr.dest_qp_num;
447
448 ack_req = ((pkt->mask & RXE_END_MASK) ||
449 (qp->req.noack_pkts++ > RXE_MAX_PKT_PER_ACK));
450 if (ack_req)
451 qp->req.noack_pkts = 0;
452
453 bth_init(pkt, pkt->opcode, solicited, 0, pad, IB_DEFAULT_PKEY_FULL, qp_num,
454 ack_req, pkt->psn);
455
456 /* init optional headers */
457 if (pkt->mask & RXE_RETH_MASK) {
458 if (pkt->mask & RXE_FETH_MASK)
459 reth_set_rkey(pkt, ibwr->wr.flush.rkey);
460 else
461 reth_set_rkey(pkt, ibwr->wr.rdma.rkey);
462 reth_set_va(pkt, wqe->iova);
463 reth_set_len(pkt, wqe->dma.resid);
464 }
465
466 /* Fill Flush Extension Transport Header */
467 if (pkt->mask & RXE_FETH_MASK)
468 feth_init(pkt, ibwr->wr.flush.type, ibwr->wr.flush.level);
469
470 if (pkt->mask & RXE_IMMDT_MASK)
471 immdt_set_imm(pkt, ibwr->ex.imm_data);
472
473 if (pkt->mask & RXE_IETH_MASK)
474 ieth_set_rkey(pkt, ibwr->ex.invalidate_rkey);
475
476 if (pkt->mask & RXE_ATMETH_MASK) {
477 atmeth_set_va(pkt, wqe->iova);
478 if (opcode == IB_OPCODE_RC_COMPARE_SWAP) {
479 atmeth_set_swap_add(pkt, ibwr->wr.atomic.swap);
480 atmeth_set_comp(pkt, ibwr->wr.atomic.compare_add);
481 } else {
482 atmeth_set_swap_add(pkt, ibwr->wr.atomic.compare_add);
483 }
484 atmeth_set_rkey(pkt, ibwr->wr.atomic.rkey);
485 }
486
487 if (pkt->mask & RXE_DETH_MASK) {
488 if (qp->ibqp.qp_num == 1)
489 deth_set_qkey(pkt, GSI_QKEY);
490 else
491 deth_set_qkey(pkt, ibwr->wr.ud.remote_qkey);
492 deth_set_sqp(pkt, qp->ibqp.qp_num);
493 }
494
495 return skb;
496 }
497
finish_packet(struct rxe_qp * qp,struct rxe_av * av,struct rxe_send_wqe * wqe,struct rxe_pkt_info * pkt,struct sk_buff * skb,u32 payload)498 static int finish_packet(struct rxe_qp *qp, struct rxe_av *av,
499 struct rxe_send_wqe *wqe, struct rxe_pkt_info *pkt,
500 struct sk_buff *skb, u32 payload)
501 {
502 int err;
503
504 err = rxe_prepare(av, pkt, skb);
505 if (err)
506 return err;
507
508 if (pkt->mask & RXE_WRITE_OR_SEND_MASK) {
509 if (wqe->wr.send_flags & IB_SEND_INLINE) {
510 u8 *tmp = &wqe->dma.inline_data[wqe->dma.sge_offset];
511
512 memcpy(payload_addr(pkt), tmp, payload);
513
514 wqe->dma.resid -= payload;
515 wqe->dma.sge_offset += payload;
516 } else {
517 err = copy_data(qp->pd, 0, &wqe->dma,
518 payload_addr(pkt), payload,
519 RXE_FROM_MR_OBJ);
520 if (err)
521 return err;
522 }
523 if (bth_pad(pkt)) {
524 u8 *pad = payload_addr(pkt) + payload;
525
526 memset(pad, 0, bth_pad(pkt));
527 }
528 } else if (pkt->mask & RXE_FLUSH_MASK) {
529 /* oA19-2: shall have no payload. */
530 wqe->dma.resid = 0;
531 }
532
533 if (pkt->mask & RXE_ATOMIC_WRITE_MASK) {
534 memcpy(payload_addr(pkt), wqe->dma.atomic_wr, payload);
535 wqe->dma.resid -= payload;
536 }
537
538 return 0;
539 }
540
update_wqe_state(struct rxe_qp * qp,struct rxe_send_wqe * wqe,struct rxe_pkt_info * pkt)541 static void update_wqe_state(struct rxe_qp *qp,
542 struct rxe_send_wqe *wqe,
543 struct rxe_pkt_info *pkt)
544 {
545 if (pkt->mask & RXE_END_MASK) {
546 if (qp_type(qp) == IB_QPT_RC)
547 wqe->state = wqe_state_pending;
548 } else {
549 wqe->state = wqe_state_processing;
550 }
551 }
552
update_wqe_psn(struct rxe_qp * qp,struct rxe_send_wqe * wqe,struct rxe_pkt_info * pkt,u32 payload)553 static void update_wqe_psn(struct rxe_qp *qp,
554 struct rxe_send_wqe *wqe,
555 struct rxe_pkt_info *pkt,
556 u32 payload)
557 {
558 /* number of packets left to send including current one */
559 int num_pkt = (wqe->dma.resid + payload + qp->mtu - 1) / qp->mtu;
560
561 /* handle zero length packet case */
562 if (num_pkt == 0)
563 num_pkt = 1;
564
565 if (pkt->mask & RXE_START_MASK) {
566 wqe->first_psn = qp->req.psn;
567 wqe->last_psn = (qp->req.psn + num_pkt - 1) & BTH_PSN_MASK;
568 }
569
570 if (pkt->mask & RXE_READ_MASK)
571 qp->req.psn = (wqe->first_psn + num_pkt) & BTH_PSN_MASK;
572 else
573 qp->req.psn = (qp->req.psn + 1) & BTH_PSN_MASK;
574 }
575
save_state(struct rxe_send_wqe * wqe,struct rxe_qp * qp,struct rxe_send_wqe * rollback_wqe,u32 * rollback_psn)576 static void save_state(struct rxe_send_wqe *wqe,
577 struct rxe_qp *qp,
578 struct rxe_send_wqe *rollback_wqe,
579 u32 *rollback_psn)
580 {
581 rollback_wqe->state = wqe->state;
582 rollback_wqe->first_psn = wqe->first_psn;
583 rollback_wqe->last_psn = wqe->last_psn;
584 rollback_wqe->dma = wqe->dma;
585 *rollback_psn = qp->req.psn;
586 }
587
rollback_state(struct rxe_send_wqe * wqe,struct rxe_qp * qp,struct rxe_send_wqe * rollback_wqe,u32 rollback_psn)588 static void rollback_state(struct rxe_send_wqe *wqe,
589 struct rxe_qp *qp,
590 struct rxe_send_wqe *rollback_wqe,
591 u32 rollback_psn)
592 {
593 wqe->state = rollback_wqe->state;
594 wqe->first_psn = rollback_wqe->first_psn;
595 wqe->last_psn = rollback_wqe->last_psn;
596 wqe->dma = rollback_wqe->dma;
597 qp->req.psn = rollback_psn;
598 }
599
update_state(struct rxe_qp * qp,struct rxe_pkt_info * pkt)600 static void update_state(struct rxe_qp *qp, struct rxe_pkt_info *pkt)
601 {
602 qp->req.opcode = pkt->opcode;
603
604 if (pkt->mask & RXE_END_MASK)
605 qp->req.wqe_index = queue_next_index(qp->sq.queue,
606 qp->req.wqe_index);
607
608 qp->need_req_skb = 0;
609
610 if (qp->qp_timeout_jiffies && !timer_pending(&qp->retrans_timer))
611 mod_timer(&qp->retrans_timer,
612 jiffies + qp->qp_timeout_jiffies);
613 }
614
rxe_do_local_ops(struct rxe_qp * qp,struct rxe_send_wqe * wqe)615 static int rxe_do_local_ops(struct rxe_qp *qp, struct rxe_send_wqe *wqe)
616 {
617 u8 opcode = wqe->wr.opcode;
618 u32 rkey;
619 int ret;
620
621 switch (opcode) {
622 case IB_WR_LOCAL_INV:
623 rkey = wqe->wr.ex.invalidate_rkey;
624 if (rkey_is_mw(rkey))
625 ret = rxe_invalidate_mw(qp, rkey);
626 else
627 ret = rxe_invalidate_mr(qp, rkey);
628
629 if (unlikely(ret)) {
630 wqe->status = IB_WC_LOC_QP_OP_ERR;
631 return ret;
632 }
633 break;
634 case IB_WR_REG_MR:
635 ret = rxe_reg_fast_mr(qp, wqe);
636 if (unlikely(ret)) {
637 wqe->status = IB_WC_LOC_QP_OP_ERR;
638 return ret;
639 }
640 break;
641 case IB_WR_BIND_MW:
642 ret = rxe_bind_mw(qp, wqe);
643 if (unlikely(ret)) {
644 wqe->status = IB_WC_MW_BIND_ERR;
645 return ret;
646 }
647 break;
648 default:
649 rxe_dbg_qp(qp, "Unexpected send wqe opcode %d\n", opcode);
650 wqe->status = IB_WC_LOC_QP_OP_ERR;
651 return -EINVAL;
652 }
653
654 wqe->state = wqe_state_done;
655 wqe->status = IB_WC_SUCCESS;
656 qp->req.wqe_index = queue_next_index(qp->sq.queue, qp->req.wqe_index);
657
658 /* There is no ack coming for local work requests
659 * which can lead to a deadlock. So go ahead and complete
660 * it now.
661 */
662 rxe_sched_task(&qp->comp.task);
663
664 return 0;
665 }
666
rxe_requester(struct rxe_qp * qp)667 int rxe_requester(struct rxe_qp *qp)
668 {
669 struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
670 struct rxe_pkt_info pkt;
671 struct sk_buff *skb;
672 struct rxe_send_wqe *wqe;
673 enum rxe_hdr_mask mask;
674 u32 payload;
675 int mtu;
676 int opcode;
677 int err;
678 int ret;
679 struct rxe_send_wqe rollback_wqe;
680 u32 rollback_psn;
681 struct rxe_queue *q = qp->sq.queue;
682 struct rxe_ah *ah;
683 struct rxe_av *av;
684 unsigned long flags;
685
686 spin_lock_irqsave(&qp->state_lock, flags);
687 if (unlikely(!qp->valid)) {
688 spin_unlock_irqrestore(&qp->state_lock, flags);
689 goto exit;
690 }
691
692 if (unlikely(qp_state(qp) == IB_QPS_ERR)) {
693 wqe = __req_next_wqe(qp);
694 spin_unlock_irqrestore(&qp->state_lock, flags);
695 if (wqe)
696 goto err;
697 else
698 goto exit;
699 }
700
701 if (unlikely(qp_state(qp) == IB_QPS_RESET)) {
702 qp->req.wqe_index = queue_get_consumer(q,
703 QUEUE_TYPE_FROM_CLIENT);
704 qp->req.opcode = -1;
705 qp->req.need_rd_atomic = 0;
706 qp->req.wait_psn = 0;
707 qp->req.need_retry = 0;
708 qp->req.wait_for_rnr_timer = 0;
709 spin_unlock_irqrestore(&qp->state_lock, flags);
710 goto exit;
711 }
712 spin_unlock_irqrestore(&qp->state_lock, flags);
713
714 /* we come here if the retransmit timer has fired
715 * or if the rnr timer has fired. If the retransmit
716 * timer fires while we are processing an RNR NAK wait
717 * until the rnr timer has fired before starting the
718 * retry flow
719 */
720 if (unlikely(qp->req.need_retry && !qp->req.wait_for_rnr_timer)) {
721 req_retry(qp);
722 qp->req.need_retry = 0;
723 }
724
725 wqe = req_next_wqe(qp);
726 if (unlikely(!wqe))
727 goto exit;
728
729 if (rxe_wqe_is_fenced(qp, wqe)) {
730 qp->req.wait_fence = 1;
731 goto exit;
732 }
733
734 if (wqe->mask & WR_LOCAL_OP_MASK) {
735 err = rxe_do_local_ops(qp, wqe);
736 if (unlikely(err))
737 goto err;
738 else
739 goto done;
740 }
741
742 if (unlikely(qp_type(qp) == IB_QPT_RC &&
743 psn_compare(qp->req.psn, (qp->comp.psn +
744 RXE_MAX_UNACKED_PSNS)) > 0)) {
745 qp->req.wait_psn = 1;
746 goto exit;
747 }
748
749 /* Limit the number of inflight SKBs per QP */
750 if (unlikely(atomic_read(&qp->skb_out) >
751 RXE_INFLIGHT_SKBS_PER_QP_HIGH)) {
752 qp->need_req_skb = 1;
753 goto exit;
754 }
755
756 opcode = next_opcode(qp, wqe, wqe->wr.opcode);
757 if (unlikely(opcode < 0)) {
758 wqe->status = IB_WC_LOC_QP_OP_ERR;
759 goto err;
760 }
761
762 mask = rxe_opcode[opcode].mask;
763 if (unlikely(mask & (RXE_READ_OR_ATOMIC_MASK |
764 RXE_ATOMIC_WRITE_MASK))) {
765 if (check_init_depth(qp, wqe))
766 goto exit;
767 }
768
769 mtu = get_mtu(qp);
770 payload = (mask & (RXE_WRITE_OR_SEND_MASK | RXE_ATOMIC_WRITE_MASK)) ?
771 wqe->dma.resid : 0;
772 if (payload > mtu) {
773 if (qp_type(qp) == IB_QPT_UD) {
774 /* C10-93.1.1: If the total sum of all the buffer lengths specified for a
775 * UD message exceeds the MTU of the port as returned by QueryHCA, the CI
776 * shall not emit any packets for this message. Further, the CI shall not
777 * generate an error due to this condition.
778 */
779
780 /* fake a successful UD send */
781 wqe->first_psn = qp->req.psn;
782 wqe->last_psn = qp->req.psn;
783 qp->req.psn = (qp->req.psn + 1) & BTH_PSN_MASK;
784 qp->req.opcode = IB_OPCODE_UD_SEND_ONLY;
785 qp->req.wqe_index = queue_next_index(qp->sq.queue,
786 qp->req.wqe_index);
787 wqe->state = wqe_state_done;
788 wqe->status = IB_WC_SUCCESS;
789 rxe_sched_task(&qp->comp.task);
790 goto done;
791 }
792 payload = mtu;
793 }
794
795 pkt.rxe = rxe;
796 pkt.opcode = opcode;
797 pkt.qp = qp;
798 pkt.psn = qp->req.psn;
799 pkt.mask = rxe_opcode[opcode].mask;
800 pkt.wqe = wqe;
801
802 /* save wqe state before we build and send packet */
803 save_state(wqe, qp, &rollback_wqe, &rollback_psn);
804
805 av = rxe_get_av(&pkt, &ah);
806 if (unlikely(!av)) {
807 rxe_dbg_qp(qp, "Failed no address vector\n");
808 wqe->status = IB_WC_LOC_QP_OP_ERR;
809 goto err;
810 }
811
812 skb = init_req_packet(qp, av, wqe, opcode, payload, &pkt);
813 if (unlikely(!skb)) {
814 rxe_dbg_qp(qp, "Failed allocating skb\n");
815 wqe->status = IB_WC_LOC_QP_OP_ERR;
816 if (ah)
817 rxe_put(ah);
818 goto err;
819 }
820
821 err = finish_packet(qp, av, wqe, &pkt, skb, payload);
822 if (unlikely(err)) {
823 rxe_dbg_qp(qp, "Error during finish packet\n");
824 if (err == -EFAULT)
825 wqe->status = IB_WC_LOC_PROT_ERR;
826 else
827 wqe->status = IB_WC_LOC_QP_OP_ERR;
828 kfree_skb(skb);
829 if (ah)
830 rxe_put(ah);
831 goto err;
832 }
833
834 if (ah)
835 rxe_put(ah);
836
837 /* update wqe state as though we had sent it */
838 update_wqe_state(qp, wqe, &pkt);
839 update_wqe_psn(qp, wqe, &pkt, payload);
840
841 err = rxe_xmit_packet(qp, &pkt, skb);
842 if (err) {
843 if (err != -EAGAIN) {
844 wqe->status = IB_WC_LOC_QP_OP_ERR;
845 goto err;
846 }
847
848 /* the packet was dropped so reset wqe to the state
849 * before we sent it so we can try to resend
850 */
851 rollback_state(wqe, qp, &rollback_wqe, rollback_psn);
852
853 /* force a delay until the dropped packet is freed and
854 * the send queue is drained below the low water mark
855 */
856 qp->need_req_skb = 1;
857
858 rxe_sched_task(&qp->req.task);
859 goto exit;
860 }
861
862 update_state(qp, &pkt);
863
864 /* A non-zero return value will cause rxe_do_task to
865 * exit its loop and end the work item. A zero return
866 * will continue looping and return to rxe_requester
867 */
868 done:
869 ret = 0;
870 goto out;
871 err:
872 /* update wqe_index for each wqe completion */
873 qp->req.wqe_index = queue_next_index(qp->sq.queue, qp->req.wqe_index);
874 wqe->state = wqe_state_error;
875 rxe_qp_error(qp);
876 exit:
877 ret = -EAGAIN;
878 out:
879 return ret;
880 }
881
