1 // SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
2
3 /* Authors: Bernard Metzler <bmt@zurich.ibm.com> */
4 /* Copyright (c) 2008-2019, IBM Corporation */
5
6 #include <linux/errno.h>
7 #include <linux/types.h>
8 #include <linux/net.h>
9 #include <linux/scatterlist.h>
10 #include <linux/llist.h>
11 #include <asm/barrier.h>
12 #include <net/tcp.h>
13 #include <trace/events/sock.h>
14
15 #include "siw.h"
16 #include "siw_verbs.h"
17 #include "siw_mem.h"
18
19 static char siw_qp_state_to_string[SIW_QP_STATE_COUNT][sizeof "TERMINATE"] = {
20 [SIW_QP_STATE_IDLE] = "IDLE",
21 [SIW_QP_STATE_RTR] = "RTR",
22 [SIW_QP_STATE_RTS] = "RTS",
23 [SIW_QP_STATE_CLOSING] = "CLOSING",
24 [SIW_QP_STATE_TERMINATE] = "TERMINATE",
25 [SIW_QP_STATE_ERROR] = "ERROR"
26 };
27
28 /*
29 * iWARP (RDMAP, DDP and MPA) parameters as well as Softiwarp settings on a
30 * per-RDMAP message basis. Please keep order of initializer. All MPA len
31 * is initialized to minimum packet size.
32 */
33 struct iwarp_msg_info iwarp_pktinfo[RDMAP_TERMINATE + 1] = {
34 { /* RDMAP_RDMA_WRITE */
35 .hdr_len = sizeof(struct iwarp_rdma_write),
36 .ctrl.mpa_len = htons(sizeof(struct iwarp_rdma_write) - 2),
37 .ctrl.ddp_rdmap_ctrl = DDP_FLAG_TAGGED | DDP_FLAG_LAST |
38 cpu_to_be16(DDP_VERSION << 8) |
39 cpu_to_be16(RDMAP_VERSION << 6) |
40 cpu_to_be16(RDMAP_RDMA_WRITE),
41 .rx_data = siw_proc_write },
42 { /* RDMAP_RDMA_READ_REQ */
43 .hdr_len = sizeof(struct iwarp_rdma_rreq),
44 .ctrl.mpa_len = htons(sizeof(struct iwarp_rdma_rreq) - 2),
45 .ctrl.ddp_rdmap_ctrl = DDP_FLAG_LAST | cpu_to_be16(DDP_VERSION << 8) |
46 cpu_to_be16(RDMAP_VERSION << 6) |
47 cpu_to_be16(RDMAP_RDMA_READ_REQ),
48 .rx_data = siw_proc_rreq },
49 { /* RDMAP_RDMA_READ_RESP */
50 .hdr_len = sizeof(struct iwarp_rdma_rresp),
51 .ctrl.mpa_len = htons(sizeof(struct iwarp_rdma_rresp) - 2),
52 .ctrl.ddp_rdmap_ctrl = DDP_FLAG_TAGGED | DDP_FLAG_LAST |
53 cpu_to_be16(DDP_VERSION << 8) |
54 cpu_to_be16(RDMAP_VERSION << 6) |
55 cpu_to_be16(RDMAP_RDMA_READ_RESP),
56 .rx_data = siw_proc_rresp },
57 { /* RDMAP_SEND */
58 .hdr_len = sizeof(struct iwarp_send),
59 .ctrl.mpa_len = htons(sizeof(struct iwarp_send) - 2),
60 .ctrl.ddp_rdmap_ctrl = DDP_FLAG_LAST | cpu_to_be16(DDP_VERSION << 8) |
61 cpu_to_be16(RDMAP_VERSION << 6) |
62 cpu_to_be16(RDMAP_SEND),
63 .rx_data = siw_proc_send },
64 { /* RDMAP_SEND_INVAL */
65 .hdr_len = sizeof(struct iwarp_send_inv),
66 .ctrl.mpa_len = htons(sizeof(struct iwarp_send_inv) - 2),
67 .ctrl.ddp_rdmap_ctrl = DDP_FLAG_LAST | cpu_to_be16(DDP_VERSION << 8) |
68 cpu_to_be16(RDMAP_VERSION << 6) |
69 cpu_to_be16(RDMAP_SEND_INVAL),
70 .rx_data = siw_proc_send },
71 { /* RDMAP_SEND_SE */
72 .hdr_len = sizeof(struct iwarp_send),
73 .ctrl.mpa_len = htons(sizeof(struct iwarp_send) - 2),
74 .ctrl.ddp_rdmap_ctrl = DDP_FLAG_LAST | cpu_to_be16(DDP_VERSION << 8) |
75 cpu_to_be16(RDMAP_VERSION << 6) |
76 cpu_to_be16(RDMAP_SEND_SE),
77 .rx_data = siw_proc_send },
78 { /* RDMAP_SEND_SE_INVAL */
79 .hdr_len = sizeof(struct iwarp_send_inv),
80 .ctrl.mpa_len = htons(sizeof(struct iwarp_send_inv) - 2),
81 .ctrl.ddp_rdmap_ctrl = DDP_FLAG_LAST | cpu_to_be16(DDP_VERSION << 8) |
82 cpu_to_be16(RDMAP_VERSION << 6) |
83 cpu_to_be16(RDMAP_SEND_SE_INVAL),
84 .rx_data = siw_proc_send },
85 { /* RDMAP_TERMINATE */
86 .hdr_len = sizeof(struct iwarp_terminate),
87 .ctrl.mpa_len = htons(sizeof(struct iwarp_terminate) - 2),
88 .ctrl.ddp_rdmap_ctrl = DDP_FLAG_LAST | cpu_to_be16(DDP_VERSION << 8) |
89 cpu_to_be16(RDMAP_VERSION << 6) |
90 cpu_to_be16(RDMAP_TERMINATE),
91 .rx_data = siw_proc_terminate }
92 };
93
siw_qp_llp_data_ready(struct sock * sk)94 void siw_qp_llp_data_ready(struct sock *sk)
95 {
96 struct siw_qp *qp;
97
98 trace_sk_data_ready(sk);
99
100 read_lock(&sk->sk_callback_lock);
101
102 if (unlikely(!sk->sk_user_data || !sk_to_qp(sk)))
103 goto done;
104
105 qp = sk_to_qp(sk);
106
107 if (likely(!qp->rx_stream.rx_suspend &&
108 down_read_trylock(&qp->state_lock))) {
109 read_descriptor_t rd_desc = { .arg.data = qp, .count = 1 };
110
111 if (likely(qp->attrs.state == SIW_QP_STATE_RTS))
112 /*
113 * Implements data receive operation during
114 * socket callback. TCP gracefully catches
115 * the case where there is nothing to receive
116 * (not calling siw_tcp_rx_data() then).
117 */
118 tcp_read_sock(sk, &rd_desc, siw_tcp_rx_data);
119
120 up_read(&qp->state_lock);
121 } else {
122 siw_dbg_qp(qp, "unable to process RX, suspend: %d\n",
123 qp->rx_stream.rx_suspend);
124 }
125 done:
126 read_unlock(&sk->sk_callback_lock);
127 }
128
siw_qp_llp_close(struct siw_qp * qp)129 void siw_qp_llp_close(struct siw_qp *qp)
130 {
131 siw_dbg_qp(qp, "enter llp close, state = %s\n",
132 siw_qp_state_to_string[qp->attrs.state]);
133
134 down_write(&qp->state_lock);
135
136 qp->rx_stream.rx_suspend = 1;
137 qp->tx_ctx.tx_suspend = 1;
138 qp->attrs.sk = NULL;
139
140 switch (qp->attrs.state) {
141 case SIW_QP_STATE_RTS:
142 case SIW_QP_STATE_RTR:
143 case SIW_QP_STATE_IDLE:
144 case SIW_QP_STATE_TERMINATE:
145 qp->attrs.state = SIW_QP_STATE_ERROR;
146 break;
147 /*
148 * SIW_QP_STATE_CLOSING:
149 *
150 * This is a forced close. shall the QP be moved to
151 * ERROR or IDLE ?
152 */
153 case SIW_QP_STATE_CLOSING:
154 if (tx_wqe(qp)->wr_status == SIW_WR_IDLE)
155 qp->attrs.state = SIW_QP_STATE_ERROR;
156 else
157 qp->attrs.state = SIW_QP_STATE_IDLE;
158 break;
159
160 default:
161 siw_dbg_qp(qp, "llp close: no state transition needed: %s\n",
162 siw_qp_state_to_string[qp->attrs.state]);
163 break;
164 }
165 siw_sq_flush(qp);
166 siw_rq_flush(qp);
167
168 /*
169 * Dereference closing CEP
170 */
171 if (qp->cep) {
172 siw_cep_put(qp->cep);
173 qp->cep = NULL;
174 }
175
176 up_write(&qp->state_lock);
177
178 siw_dbg_qp(qp, "llp close exit: state %s\n",
179 siw_qp_state_to_string[qp->attrs.state]);
180 }
181
182 /*
183 * socket callback routine informing about newly available send space.
184 * Function schedules SQ work for processing SQ items.
185 */
siw_qp_llp_write_space(struct sock * sk)186 void siw_qp_llp_write_space(struct sock *sk)
187 {
188 struct siw_cep *cep;
189
190 read_lock(&sk->sk_callback_lock);
191
192 cep = sk_to_cep(sk);
193 if (cep) {
194 cep->sk_write_space(sk);
195
196 if (!test_bit(SOCK_NOSPACE, &sk->sk_socket->flags))
197 (void)siw_sq_start(cep->qp);
198 }
199
200 read_unlock(&sk->sk_callback_lock);
201 }
202
siw_qp_readq_init(struct siw_qp * qp,int irq_size,int orq_size)203 static int siw_qp_readq_init(struct siw_qp *qp, int irq_size, int orq_size)
204 {
205 if (irq_size) {
206 irq_size = roundup_pow_of_two(irq_size);
207 qp->irq = vcalloc(irq_size, sizeof(struct siw_sqe));
208 if (!qp->irq) {
209 qp->attrs.irq_size = 0;
210 return -ENOMEM;
211 }
212 }
213 if (orq_size) {
214 orq_size = roundup_pow_of_two(orq_size);
215 qp->orq = vcalloc(orq_size, sizeof(struct siw_sqe));
216 if (!qp->orq) {
217 qp->attrs.orq_size = 0;
218 qp->attrs.irq_size = 0;
219 vfree(qp->irq);
220 return -ENOMEM;
221 }
222 }
223 qp->attrs.irq_size = irq_size;
224 qp->attrs.orq_size = orq_size;
225 siw_dbg_qp(qp, "ORD %d, IRD %d\n", orq_size, irq_size);
226 return 0;
227 }
228
siw_qp_enable_crc(struct siw_qp * qp)229 static int siw_qp_enable_crc(struct siw_qp *qp)
230 {
231 struct siw_rx_stream *c_rx = &qp->rx_stream;
232 struct siw_iwarp_tx *c_tx = &qp->tx_ctx;
233 int size;
234
235 if (siw_crypto_shash == NULL)
236 return -ENOENT;
237
238 size = crypto_shash_descsize(siw_crypto_shash) +
239 sizeof(struct shash_desc);
240
241 c_tx->mpa_crc_hd = kzalloc(size, GFP_KERNEL);
242 c_rx->mpa_crc_hd = kzalloc(size, GFP_KERNEL);
243 if (!c_tx->mpa_crc_hd || !c_rx->mpa_crc_hd) {
244 kfree(c_tx->mpa_crc_hd);
245 kfree(c_rx->mpa_crc_hd);
246 c_tx->mpa_crc_hd = NULL;
247 c_rx->mpa_crc_hd = NULL;
248 return -ENOMEM;
249 }
250 c_tx->mpa_crc_hd->tfm = siw_crypto_shash;
251 c_rx->mpa_crc_hd->tfm = siw_crypto_shash;
252
253 return 0;
254 }
255
256 /*
257 * Send a non signalled READ or WRITE to peer side as negotiated
258 * with MPAv2 P2P setup protocol. The work request is only created
259 * as a current active WR and does not consume Send Queue space.
260 *
261 * Caller must hold QP state lock.
262 */
siw_qp_mpa_rts(struct siw_qp * qp,enum mpa_v2_ctrl ctrl)263 int siw_qp_mpa_rts(struct siw_qp *qp, enum mpa_v2_ctrl ctrl)
264 {
265 struct siw_wqe *wqe = tx_wqe(qp);
266 unsigned long flags;
267 int rv = 0;
268
269 spin_lock_irqsave(&qp->sq_lock, flags);
270
271 if (unlikely(wqe->wr_status != SIW_WR_IDLE)) {
272 spin_unlock_irqrestore(&qp->sq_lock, flags);
273 return -EIO;
274 }
275 memset(wqe->mem, 0, sizeof(*wqe->mem) * SIW_MAX_SGE);
276
277 wqe->wr_status = SIW_WR_QUEUED;
278 wqe->sqe.flags = 0;
279 wqe->sqe.num_sge = 1;
280 wqe->sqe.sge[0].length = 0;
281 wqe->sqe.sge[0].laddr = 0;
282 wqe->sqe.sge[0].lkey = 0;
283 /*
284 * While it must not be checked for inbound zero length
285 * READ/WRITE, some HW may treat STag 0 special.
286 */
287 wqe->sqe.rkey = 1;
288 wqe->sqe.raddr = 0;
289 wqe->processed = 0;
290
291 if (ctrl & MPA_V2_RDMA_WRITE_RTR)
292 wqe->sqe.opcode = SIW_OP_WRITE;
293 else if (ctrl & MPA_V2_RDMA_READ_RTR) {
294 struct siw_sqe *rreq = NULL;
295
296 wqe->sqe.opcode = SIW_OP_READ;
297
298 spin_lock(&qp->orq_lock);
299
300 if (qp->attrs.orq_size)
301 rreq = orq_get_free(qp);
302 if (rreq) {
303 siw_read_to_orq(rreq, &wqe->sqe);
304 qp->orq_put++;
305 } else
306 rv = -EIO;
307
308 spin_unlock(&qp->orq_lock);
309 } else
310 rv = -EINVAL;
311
312 if (rv)
313 wqe->wr_status = SIW_WR_IDLE;
314
315 spin_unlock_irqrestore(&qp->sq_lock, flags);
316
317 if (!rv)
318 rv = siw_sq_start(qp);
319
320 return rv;
321 }
322
323 /*
324 * Map memory access error to DDP tagged error
325 */
siw_tagged_error(enum siw_access_state state)326 enum ddp_ecode siw_tagged_error(enum siw_access_state state)
327 {
328 switch (state) {
329 case E_STAG_INVALID:
330 return DDP_ECODE_T_INVALID_STAG;
331 case E_BASE_BOUNDS:
332 return DDP_ECODE_T_BASE_BOUNDS;
333 case E_PD_MISMATCH:
334 return DDP_ECODE_T_STAG_NOT_ASSOC;
335 case E_ACCESS_PERM:
336 /*
337 * RFC 5041 (DDP) lacks an ecode for insufficient access
338 * permissions. 'Invalid STag' seem to be the closest
339 * match though.
340 */
341 return DDP_ECODE_T_INVALID_STAG;
342 default:
343 WARN_ON(1);
344 return DDP_ECODE_T_INVALID_STAG;
345 }
346 }
347
348 /*
349 * Map memory access error to RDMAP protection error
350 */
siw_rdmap_error(enum siw_access_state state)351 enum rdmap_ecode siw_rdmap_error(enum siw_access_state state)
352 {
353 switch (state) {
354 case E_STAG_INVALID:
355 return RDMAP_ECODE_INVALID_STAG;
356 case E_BASE_BOUNDS:
357 return RDMAP_ECODE_BASE_BOUNDS;
358 case E_PD_MISMATCH:
359 return RDMAP_ECODE_STAG_NOT_ASSOC;
360 case E_ACCESS_PERM:
361 return RDMAP_ECODE_ACCESS_RIGHTS;
362 default:
363 return RDMAP_ECODE_UNSPECIFIED;
364 }
365 }
366
siw_init_terminate(struct siw_qp * qp,enum term_elayer layer,u8 etype,u8 ecode,int in_tx)367 void siw_init_terminate(struct siw_qp *qp, enum term_elayer layer, u8 etype,
368 u8 ecode, int in_tx)
369 {
370 if (!qp->term_info.valid) {
371 memset(&qp->term_info, 0, sizeof(qp->term_info));
372 qp->term_info.layer = layer;
373 qp->term_info.etype = etype;
374 qp->term_info.ecode = ecode;
375 qp->term_info.in_tx = in_tx;
376 qp->term_info.valid = 1;
377 }
378 siw_dbg_qp(qp, "init TERM: layer %d, type %d, code %d, in tx %s\n",
379 layer, etype, ecode, in_tx ? "yes" : "no");
380 }
381
382 /*
383 * Send a TERMINATE message, as defined in RFC's 5040/5041/5044/6581.
384 * Sending TERMINATE messages is best effort - such messages
385 * can only be send if the QP is still connected and it does
386 * not have another outbound message in-progress, i.e. the
387 * TERMINATE message must not interfer with an incomplete current
388 * transmit operation.
389 */
siw_send_terminate(struct siw_qp * qp)390 void siw_send_terminate(struct siw_qp *qp)
391 {
392 struct kvec iov[3];
393 struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_EOR };
394 struct iwarp_terminate *term = NULL;
395 union iwarp_hdr *err_hdr = NULL;
396 struct socket *s = qp->attrs.sk;
397 struct siw_rx_stream *srx = &qp->rx_stream;
398 union iwarp_hdr *rx_hdr = &srx->hdr;
399 u32 crc = 0;
400 int num_frags, len_terminate, rv;
401
402 if (!qp->term_info.valid)
403 return;
404
405 qp->term_info.valid = 0;
406
407 if (tx_wqe(qp)->wr_status == SIW_WR_INPROGRESS) {
408 siw_dbg_qp(qp, "cannot send TERMINATE: op %d in progress\n",
409 tx_type(tx_wqe(qp)));
410 return;
411 }
412 if (!s && qp->cep)
413 /* QP not yet in RTS. Take socket from connection end point */
414 s = qp->cep->sock;
415
416 if (!s) {
417 siw_dbg_qp(qp, "cannot send TERMINATE: not connected\n");
418 return;
419 }
420
421 term = kzalloc(sizeof(*term), GFP_KERNEL);
422 if (!term)
423 return;
424
425 term->ddp_qn = cpu_to_be32(RDMAP_UNTAGGED_QN_TERMINATE);
426 term->ddp_mo = 0;
427 term->ddp_msn = cpu_to_be32(1);
428
429 iov[0].iov_base = term;
430 iov[0].iov_len = sizeof(*term);
431
432 if ((qp->term_info.layer == TERM_ERROR_LAYER_DDP) ||
433 ((qp->term_info.layer == TERM_ERROR_LAYER_RDMAP) &&
434 (qp->term_info.etype != RDMAP_ETYPE_CATASTROPHIC))) {
435 err_hdr = kzalloc(sizeof(*err_hdr), GFP_KERNEL);
436 if (!err_hdr) {
437 kfree(term);
438 return;
439 }
440 }
441 memcpy(&term->ctrl, &iwarp_pktinfo[RDMAP_TERMINATE].ctrl,
442 sizeof(struct iwarp_ctrl));
443
444 __rdmap_term_set_layer(term, qp->term_info.layer);
445 __rdmap_term_set_etype(term, qp->term_info.etype);
446 __rdmap_term_set_ecode(term, qp->term_info.ecode);
447
448 switch (qp->term_info.layer) {
449 case TERM_ERROR_LAYER_RDMAP:
450 if (qp->term_info.etype == RDMAP_ETYPE_CATASTROPHIC)
451 /* No additional DDP/RDMAP header to be included */
452 break;
453
454 if (qp->term_info.etype == RDMAP_ETYPE_REMOTE_PROTECTION) {
455 /*
456 * Complete RDMAP frame will get attached, and
457 * DDP segment length is valid
458 */
459 term->flag_m = 1;
460 term->flag_d = 1;
461 term->flag_r = 1;
462
463 if (qp->term_info.in_tx) {
464 struct iwarp_rdma_rreq *rreq;
465 struct siw_wqe *wqe = tx_wqe(qp);
466
467 /* Inbound RREQ error, detected during
468 * RRESP creation. Take state from
469 * current TX work queue element to
470 * reconstruct peers RREQ.
471 */
472 rreq = (struct iwarp_rdma_rreq *)err_hdr;
473
474 memcpy(&rreq->ctrl,
475 &iwarp_pktinfo[RDMAP_RDMA_READ_REQ].ctrl,
476 sizeof(struct iwarp_ctrl));
477
478 rreq->rsvd = 0;
479 rreq->ddp_qn =
480 htonl(RDMAP_UNTAGGED_QN_RDMA_READ);
481
482 /* Provide RREQ's MSN as kept aside */
483 rreq->ddp_msn = htonl(wqe->sqe.sge[0].length);
484
485 rreq->ddp_mo = htonl(wqe->processed);
486 rreq->sink_stag = htonl(wqe->sqe.rkey);
487 rreq->sink_to = cpu_to_be64(wqe->sqe.raddr);
488 rreq->read_size = htonl(wqe->sqe.sge[0].length);
489 rreq->source_stag = htonl(wqe->sqe.sge[0].lkey);
490 rreq->source_to =
491 cpu_to_be64(wqe->sqe.sge[0].laddr);
492
493 iov[1].iov_base = rreq;
494 iov[1].iov_len = sizeof(*rreq);
495
496 rx_hdr = (union iwarp_hdr *)rreq;
497 } else {
498 /* Take RDMAP/DDP information from
499 * current (failed) inbound frame.
500 */
501 iov[1].iov_base = rx_hdr;
502
503 if (__rdmap_get_opcode(&rx_hdr->ctrl) ==
504 RDMAP_RDMA_READ_REQ)
505 iov[1].iov_len =
506 sizeof(struct iwarp_rdma_rreq);
507 else /* SEND type */
508 iov[1].iov_len =
509 sizeof(struct iwarp_send);
510 }
511 } else {
512 /* Do not report DDP hdr information if packet
513 * layout is unknown
514 */
515 if ((qp->term_info.ecode == RDMAP_ECODE_VERSION) ||
516 (qp->term_info.ecode == RDMAP_ECODE_OPCODE))
517 break;
518
519 iov[1].iov_base = rx_hdr;
520
521 /* Only DDP frame will get attached */
522 if (rx_hdr->ctrl.ddp_rdmap_ctrl & DDP_FLAG_TAGGED)
523 iov[1].iov_len =
524 sizeof(struct iwarp_rdma_write);
525 else
526 iov[1].iov_len = sizeof(struct iwarp_send);
527
528 term->flag_m = 1;
529 term->flag_d = 1;
530 }
531 term->ctrl.mpa_len = cpu_to_be16(iov[1].iov_len);
532 break;
533
534 case TERM_ERROR_LAYER_DDP:
535 /* Report error encountered while DDP processing.
536 * This can only happen as a result of inbound
537 * DDP processing
538 */
539
540 /* Do not report DDP hdr information if packet
541 * layout is unknown
542 */
543 if (((qp->term_info.etype == DDP_ETYPE_TAGGED_BUF) &&
544 (qp->term_info.ecode == DDP_ECODE_T_VERSION)) ||
545 ((qp->term_info.etype == DDP_ETYPE_UNTAGGED_BUF) &&
546 (qp->term_info.ecode == DDP_ECODE_UT_VERSION)))
547 break;
548
549 iov[1].iov_base = rx_hdr;
550
551 if (rx_hdr->ctrl.ddp_rdmap_ctrl & DDP_FLAG_TAGGED)
552 iov[1].iov_len = sizeof(struct iwarp_ctrl_tagged);
553 else
554 iov[1].iov_len = sizeof(struct iwarp_ctrl_untagged);
555
556 term->flag_m = 1;
557 term->flag_d = 1;
558 break;
559
560 default:
561 break;
562 }
563 if (term->flag_m || term->flag_d || term->flag_r) {
564 iov[2].iov_base = &crc;
565 iov[2].iov_len = sizeof(crc);
566 len_terminate = sizeof(*term) + iov[1].iov_len + MPA_CRC_SIZE;
567 num_frags = 3;
568 } else {
569 iov[1].iov_base = &crc;
570 iov[1].iov_len = sizeof(crc);
571 len_terminate = sizeof(*term) + MPA_CRC_SIZE;
572 num_frags = 2;
573 }
574
575 /* Adjust DDP Segment Length parameter, if valid */
576 if (term->flag_m) {
577 u32 real_ddp_len = be16_to_cpu(rx_hdr->ctrl.mpa_len);
578 enum rdma_opcode op = __rdmap_get_opcode(&rx_hdr->ctrl);
579
580 real_ddp_len -= iwarp_pktinfo[op].hdr_len - MPA_HDR_SIZE;
581 rx_hdr->ctrl.mpa_len = cpu_to_be16(real_ddp_len);
582 }
583
584 term->ctrl.mpa_len =
585 cpu_to_be16(len_terminate - (MPA_HDR_SIZE + MPA_CRC_SIZE));
586 if (qp->tx_ctx.mpa_crc_hd) {
587 crypto_shash_init(qp->tx_ctx.mpa_crc_hd);
588 if (crypto_shash_update(qp->tx_ctx.mpa_crc_hd,
589 (u8 *)iov[0].iov_base,
590 iov[0].iov_len))
591 goto out;
592
593 if (num_frags == 3) {
594 if (crypto_shash_update(qp->tx_ctx.mpa_crc_hd,
595 (u8 *)iov[1].iov_base,
596 iov[1].iov_len))
597 goto out;
598 }
599 crypto_shash_final(qp->tx_ctx.mpa_crc_hd, (u8 *)&crc);
600 }
601
602 rv = kernel_sendmsg(s, &msg, iov, num_frags, len_terminate);
603 siw_dbg_qp(qp, "sent TERM: %s, layer %d, type %d, code %d (%d bytes)\n",
604 rv == len_terminate ? "success" : "failure",
605 __rdmap_term_layer(term), __rdmap_term_etype(term),
606 __rdmap_term_ecode(term), rv);
607 out:
608 kfree(term);
609 kfree(err_hdr);
610 }
611
612 /*
613 * Handle all attrs other than state
614 */
siw_qp_modify_nonstate(struct siw_qp * qp,struct siw_qp_attrs * attrs,enum siw_qp_attr_mask mask)615 static void siw_qp_modify_nonstate(struct siw_qp *qp,
616 struct siw_qp_attrs *attrs,
617 enum siw_qp_attr_mask mask)
618 {
619 if (mask & SIW_QP_ATTR_ACCESS_FLAGS) {
620 if (attrs->flags & SIW_RDMA_BIND_ENABLED)
621 qp->attrs.flags |= SIW_RDMA_BIND_ENABLED;
622 else
623 qp->attrs.flags &= ~SIW_RDMA_BIND_ENABLED;
624
625 if (attrs->flags & SIW_RDMA_WRITE_ENABLED)
626 qp->attrs.flags |= SIW_RDMA_WRITE_ENABLED;
627 else
628 qp->attrs.flags &= ~SIW_RDMA_WRITE_ENABLED;
629
630 if (attrs->flags & SIW_RDMA_READ_ENABLED)
631 qp->attrs.flags |= SIW_RDMA_READ_ENABLED;
632 else
633 qp->attrs.flags &= ~SIW_RDMA_READ_ENABLED;
634 }
635 }
636
siw_qp_nextstate_from_idle(struct siw_qp * qp,struct siw_qp_attrs * attrs,enum siw_qp_attr_mask mask)637 static int siw_qp_nextstate_from_idle(struct siw_qp *qp,
638 struct siw_qp_attrs *attrs,
639 enum siw_qp_attr_mask mask)
640 {
641 int rv = 0;
642
643 switch (attrs->state) {
644 case SIW_QP_STATE_RTS:
645 if (attrs->flags & SIW_MPA_CRC) {
646 rv = siw_qp_enable_crc(qp);
647 if (rv)
648 break;
649 }
650 if (!(mask & SIW_QP_ATTR_LLP_HANDLE)) {
651 siw_dbg_qp(qp, "no socket\n");
652 rv = -EINVAL;
653 break;
654 }
655 if (!(mask & SIW_QP_ATTR_MPA)) {
656 siw_dbg_qp(qp, "no MPA\n");
657 rv = -EINVAL;
658 break;
659 }
660 /*
661 * Initialize iWARP TX state
662 */
663 qp->tx_ctx.ddp_msn[RDMAP_UNTAGGED_QN_SEND] = 0;
664 qp->tx_ctx.ddp_msn[RDMAP_UNTAGGED_QN_RDMA_READ] = 0;
665 qp->tx_ctx.ddp_msn[RDMAP_UNTAGGED_QN_TERMINATE] = 0;
666
667 /*
668 * Initialize iWARP RX state
669 */
670 qp->rx_stream.ddp_msn[RDMAP_UNTAGGED_QN_SEND] = 1;
671 qp->rx_stream.ddp_msn[RDMAP_UNTAGGED_QN_RDMA_READ] = 1;
672 qp->rx_stream.ddp_msn[RDMAP_UNTAGGED_QN_TERMINATE] = 1;
673
674 /*
675 * init IRD free queue, caller has already checked
676 * limits.
677 */
678 rv = siw_qp_readq_init(qp, attrs->irq_size,
679 attrs->orq_size);
680 if (rv)
681 break;
682
683 qp->attrs.sk = attrs->sk;
684 qp->attrs.state = SIW_QP_STATE_RTS;
685
686 siw_dbg_qp(qp, "enter RTS: crc=%s, ord=%u, ird=%u\n",
687 attrs->flags & SIW_MPA_CRC ? "y" : "n",
688 qp->attrs.orq_size, qp->attrs.irq_size);
689 break;
690
691 case SIW_QP_STATE_ERROR:
692 siw_rq_flush(qp);
693 qp->attrs.state = SIW_QP_STATE_ERROR;
694 if (qp->cep) {
695 siw_cep_put(qp->cep);
696 qp->cep = NULL;
697 }
698 break;
699
700 default:
701 break;
702 }
703 return rv;
704 }
705
siw_qp_nextstate_from_rts(struct siw_qp * qp,struct siw_qp_attrs * attrs)706 static int siw_qp_nextstate_from_rts(struct siw_qp *qp,
707 struct siw_qp_attrs *attrs)
708 {
709 int drop_conn = 0;
710
711 switch (attrs->state) {
712 case SIW_QP_STATE_CLOSING:
713 /*
714 * Verbs: move to IDLE if SQ and ORQ are empty.
715 * Move to ERROR otherwise. But first of all we must
716 * close the connection. So we keep CLOSING or ERROR
717 * as a transient state, schedule connection drop work
718 * and wait for the socket state change upcall to
719 * come back closed.
720 */
721 if (tx_wqe(qp)->wr_status == SIW_WR_IDLE) {
722 qp->attrs.state = SIW_QP_STATE_CLOSING;
723 } else {
724 qp->attrs.state = SIW_QP_STATE_ERROR;
725 siw_sq_flush(qp);
726 }
727 siw_rq_flush(qp);
728
729 drop_conn = 1;
730 break;
731
732 case SIW_QP_STATE_TERMINATE:
733 qp->attrs.state = SIW_QP_STATE_TERMINATE;
734
735 siw_init_terminate(qp, TERM_ERROR_LAYER_RDMAP,
736 RDMAP_ETYPE_CATASTROPHIC,
737 RDMAP_ECODE_UNSPECIFIED, 1);
738 drop_conn = 1;
739 break;
740
741 case SIW_QP_STATE_ERROR:
742 /*
743 * This is an emergency close.
744 *
745 * Any in progress transmit operation will get
746 * cancelled.
747 * This will likely result in a protocol failure,
748 * if a TX operation is in transit. The caller
749 * could unconditional wait to give the current
750 * operation a chance to complete.
751 * Esp., how to handle the non-empty IRQ case?
752 * The peer was asking for data transfer at a valid
753 * point in time.
754 */
755 siw_sq_flush(qp);
756 siw_rq_flush(qp);
757 qp->attrs.state = SIW_QP_STATE_ERROR;
758 drop_conn = 1;
759 break;
760
761 default:
762 break;
763 }
764 return drop_conn;
765 }
766
siw_qp_nextstate_from_term(struct siw_qp * qp,struct siw_qp_attrs * attrs)767 static void siw_qp_nextstate_from_term(struct siw_qp *qp,
768 struct siw_qp_attrs *attrs)
769 {
770 switch (attrs->state) {
771 case SIW_QP_STATE_ERROR:
772 siw_rq_flush(qp);
773 qp->attrs.state = SIW_QP_STATE_ERROR;
774
775 if (tx_wqe(qp)->wr_status != SIW_WR_IDLE)
776 siw_sq_flush(qp);
777 break;
778
779 default:
780 break;
781 }
782 }
783
siw_qp_nextstate_from_close(struct siw_qp * qp,struct siw_qp_attrs * attrs)784 static int siw_qp_nextstate_from_close(struct siw_qp *qp,
785 struct siw_qp_attrs *attrs)
786 {
787 int rv = 0;
788
789 switch (attrs->state) {
790 case SIW_QP_STATE_IDLE:
791 WARN_ON(tx_wqe(qp)->wr_status != SIW_WR_IDLE);
792 qp->attrs.state = SIW_QP_STATE_IDLE;
793 break;
794
795 case SIW_QP_STATE_CLOSING:
796 /*
797 * The LLP may already moved the QP to closing
798 * due to graceful peer close init
799 */
800 break;
801
802 case SIW_QP_STATE_ERROR:
803 /*
804 * QP was moved to CLOSING by LLP event
805 * not yet seen by user.
806 */
807 qp->attrs.state = SIW_QP_STATE_ERROR;
808
809 if (tx_wqe(qp)->wr_status != SIW_WR_IDLE)
810 siw_sq_flush(qp);
811
812 siw_rq_flush(qp);
813 break;
814
815 default:
816 siw_dbg_qp(qp, "state transition undefined: %s => %s\n",
817 siw_qp_state_to_string[qp->attrs.state],
818 siw_qp_state_to_string[attrs->state]);
819
820 rv = -ECONNABORTED;
821 }
822 return rv;
823 }
824
825 /*
826 * Caller must hold qp->state_lock
827 */
siw_qp_modify(struct siw_qp * qp,struct siw_qp_attrs * attrs,enum siw_qp_attr_mask mask)828 int siw_qp_modify(struct siw_qp *qp, struct siw_qp_attrs *attrs,
829 enum siw_qp_attr_mask mask)
830 {
831 int drop_conn = 0, rv = 0;
832
833 if (!mask)
834 return 0;
835
836 siw_dbg_qp(qp, "state: %s => %s\n",
837 siw_qp_state_to_string[qp->attrs.state],
838 siw_qp_state_to_string[attrs->state]);
839
840 if (mask != SIW_QP_ATTR_STATE)
841 siw_qp_modify_nonstate(qp, attrs, mask);
842
843 if (!(mask & SIW_QP_ATTR_STATE))
844 return 0;
845
846 switch (qp->attrs.state) {
847 case SIW_QP_STATE_IDLE:
848 case SIW_QP_STATE_RTR:
849 rv = siw_qp_nextstate_from_idle(qp, attrs, mask);
850 break;
851
852 case SIW_QP_STATE_RTS:
853 drop_conn = siw_qp_nextstate_from_rts(qp, attrs);
854 break;
855
856 case SIW_QP_STATE_TERMINATE:
857 siw_qp_nextstate_from_term(qp, attrs);
858 break;
859
860 case SIW_QP_STATE_CLOSING:
861 siw_qp_nextstate_from_close(qp, attrs);
862 break;
863 default:
864 break;
865 }
866 if (drop_conn)
867 siw_qp_cm_drop(qp, 0);
868
869 return rv;
870 }
871
siw_read_to_orq(struct siw_sqe * rreq,struct siw_sqe * sqe)872 void siw_read_to_orq(struct siw_sqe *rreq, struct siw_sqe *sqe)
873 {
874 rreq->id = sqe->id;
875 rreq->opcode = sqe->opcode;
876 rreq->sge[0].laddr = sqe->sge[0].laddr;
877 rreq->sge[0].length = sqe->sge[0].length;
878 rreq->sge[0].lkey = sqe->sge[0].lkey;
879 rreq->sge[1].lkey = sqe->sge[1].lkey;
880 rreq->flags = sqe->flags | SIW_WQE_VALID;
881 rreq->num_sge = 1;
882 }
883
siw_activate_tx_from_sq(struct siw_qp * qp)884 static int siw_activate_tx_from_sq(struct siw_qp *qp)
885 {
886 struct siw_sqe *sqe;
887 struct siw_wqe *wqe = tx_wqe(qp);
888 int rv = 1;
889
890 sqe = sq_get_next(qp);
891 if (!sqe)
892 return 0;
893
894 memset(wqe->mem, 0, sizeof(*wqe->mem) * SIW_MAX_SGE);
895 wqe->wr_status = SIW_WR_QUEUED;
896
897 /* First copy SQE to kernel private memory */
898 memcpy(&wqe->sqe, sqe, sizeof(*sqe));
899
900 if (wqe->sqe.opcode >= SIW_NUM_OPCODES) {
901 rv = -EINVAL;
902 goto out;
903 }
904 if (wqe->sqe.flags & SIW_WQE_INLINE) {
905 if (wqe->sqe.opcode != SIW_OP_SEND &&
906 wqe->sqe.opcode != SIW_OP_WRITE) {
907 rv = -EINVAL;
908 goto out;
909 }
910 if (wqe->sqe.sge[0].length > SIW_MAX_INLINE) {
911 rv = -EINVAL;
912 goto out;
913 }
914 wqe->sqe.sge[0].laddr = (uintptr_t)&wqe->sqe.sge[1];
915 wqe->sqe.sge[0].lkey = 0;
916 wqe->sqe.num_sge = 1;
917 }
918 if (wqe->sqe.flags & SIW_WQE_READ_FENCE) {
919 /* A READ cannot be fenced */
920 if (unlikely(wqe->sqe.opcode == SIW_OP_READ ||
921 wqe->sqe.opcode ==
922 SIW_OP_READ_LOCAL_INV)) {
923 siw_dbg_qp(qp, "cannot fence read\n");
924 rv = -EINVAL;
925 goto out;
926 }
927 spin_lock(&qp->orq_lock);
928
929 if (qp->attrs.orq_size && !siw_orq_empty(qp)) {
930 qp->tx_ctx.orq_fence = 1;
931 rv = 0;
932 }
933 spin_unlock(&qp->orq_lock);
934
935 } else if (wqe->sqe.opcode == SIW_OP_READ ||
936 wqe->sqe.opcode == SIW_OP_READ_LOCAL_INV) {
937 struct siw_sqe *rreq;
938
939 if (unlikely(!qp->attrs.orq_size)) {
940 /* We negotiated not to send READ req's */
941 rv = -EINVAL;
942 goto out;
943 }
944 wqe->sqe.num_sge = 1;
945
946 spin_lock(&qp->orq_lock);
947
948 rreq = orq_get_free(qp);
949 if (rreq) {
950 /*
951 * Make an immediate copy in ORQ to be ready
952 * to process loopback READ reply
953 */
954 siw_read_to_orq(rreq, &wqe->sqe);
955 qp->orq_put++;
956 } else {
957 qp->tx_ctx.orq_fence = 1;
958 rv = 0;
959 }
960 spin_unlock(&qp->orq_lock);
961 }
962
963 /* Clear SQE, can be re-used by application */
964 smp_store_mb(sqe->flags, 0);
965 qp->sq_get++;
966 out:
967 if (unlikely(rv < 0)) {
968 siw_dbg_qp(qp, "error %d\n", rv);
969 wqe->wr_status = SIW_WR_IDLE;
970 }
971 return rv;
972 }
973
974 /*
975 * Must be called with SQ locked.
976 * To avoid complete SQ starvation by constant inbound READ requests,
977 * the active IRQ will not be served after qp->irq_burst, if the
978 * SQ has pending work.
979 */
siw_activate_tx(struct siw_qp * qp)980 int siw_activate_tx(struct siw_qp *qp)
981 {
982 struct siw_sqe *irqe;
983 struct siw_wqe *wqe = tx_wqe(qp);
984
985 if (!qp->attrs.irq_size)
986 return siw_activate_tx_from_sq(qp);
987
988 irqe = &qp->irq[qp->irq_get % qp->attrs.irq_size];
989
990 if (!(irqe->flags & SIW_WQE_VALID))
991 return siw_activate_tx_from_sq(qp);
992
993 /*
994 * Avoid local WQE processing starvation in case
995 * of constant inbound READ request stream
996 */
997 if (sq_get_next(qp) && ++qp->irq_burst >= SIW_IRQ_MAXBURST_SQ_ACTIVE) {
998 qp->irq_burst = 0;
999 return siw_activate_tx_from_sq(qp);
1000 }
1001 memset(wqe->mem, 0, sizeof(*wqe->mem) * SIW_MAX_SGE);
1002 wqe->wr_status = SIW_WR_QUEUED;
1003
1004 /* start READ RESPONSE */
1005 wqe->sqe.opcode = SIW_OP_READ_RESPONSE;
1006 wqe->sqe.flags = 0;
1007 if (irqe->num_sge) {
1008 wqe->sqe.num_sge = 1;
1009 wqe->sqe.sge[0].length = irqe->sge[0].length;
1010 wqe->sqe.sge[0].laddr = irqe->sge[0].laddr;
1011 wqe->sqe.sge[0].lkey = irqe->sge[0].lkey;
1012 } else {
1013 wqe->sqe.num_sge = 0;
1014 }
1015
1016 /* Retain original RREQ's message sequence number for
1017 * potential error reporting cases.
1018 */
1019 wqe->sqe.sge[1].length = irqe->sge[1].length;
1020
1021 wqe->sqe.rkey = irqe->rkey;
1022 wqe->sqe.raddr = irqe->raddr;
1023
1024 wqe->processed = 0;
1025 qp->irq_get++;
1026
1027 /* mark current IRQ entry free */
1028 smp_store_mb(irqe->flags, 0);
1029
1030 return 1;
1031 }
1032
1033 /*
1034 * Check if current CQ state qualifies for calling CQ completion
1035 * handler. Must be called with CQ lock held.
1036 */
siw_cq_notify_now(struct siw_cq * cq,u32 flags)1037 static bool siw_cq_notify_now(struct siw_cq *cq, u32 flags)
1038 {
1039 u32 cq_notify;
1040
1041 if (!cq->base_cq.comp_handler)
1042 return false;
1043
1044 /* Read application shared notification state */
1045 cq_notify = READ_ONCE(cq->notify->flags);
1046
1047 if ((cq_notify & SIW_NOTIFY_NEXT_COMPLETION) ||
1048 ((cq_notify & SIW_NOTIFY_SOLICITED) &&
1049 (flags & SIW_WQE_SOLICITED))) {
1050 /*
1051 * CQ notification is one-shot: Since the
1052 * current CQE causes user notification,
1053 * the CQ gets dis-aremd and must be re-aremd
1054 * by the user for a new notification.
1055 */
1056 WRITE_ONCE(cq->notify->flags, SIW_NOTIFY_NOT);
1057
1058 return true;
1059 }
1060 return false;
1061 }
1062
siw_sqe_complete(struct siw_qp * qp,struct siw_sqe * sqe,u32 bytes,enum siw_wc_status status)1063 int siw_sqe_complete(struct siw_qp *qp, struct siw_sqe *sqe, u32 bytes,
1064 enum siw_wc_status status)
1065 {
1066 struct siw_cq *cq = qp->scq;
1067 int rv = 0;
1068
1069 if (cq) {
1070 u32 sqe_flags = sqe->flags;
1071 struct siw_cqe *cqe;
1072 u32 idx;
1073 unsigned long flags;
1074
1075 spin_lock_irqsave(&cq->lock, flags);
1076
1077 idx = cq->cq_put % cq->num_cqe;
1078 cqe = &cq->queue[idx];
1079
1080 if (!READ_ONCE(cqe->flags)) {
1081 bool notify;
1082
1083 cqe->id = sqe->id;
1084 cqe->opcode = sqe->opcode;
1085 cqe->status = status;
1086 cqe->imm_data = 0;
1087 cqe->bytes = bytes;
1088
1089 if (rdma_is_kernel_res(&cq->base_cq.res))
1090 cqe->base_qp = &qp->base_qp;
1091 else
1092 cqe->qp_id = qp_id(qp);
1093
1094 /* mark CQE valid for application */
1095 WRITE_ONCE(cqe->flags, SIW_WQE_VALID);
1096 /* recycle SQE */
1097 smp_store_mb(sqe->flags, 0);
1098
1099 cq->cq_put++;
1100 notify = siw_cq_notify_now(cq, sqe_flags);
1101
1102 spin_unlock_irqrestore(&cq->lock, flags);
1103
1104 if (notify) {
1105 siw_dbg_cq(cq, "Call completion handler\n");
1106 cq->base_cq.comp_handler(&cq->base_cq,
1107 cq->base_cq.cq_context);
1108 }
1109 } else {
1110 spin_unlock_irqrestore(&cq->lock, flags);
1111 rv = -ENOMEM;
1112 siw_cq_event(cq, IB_EVENT_CQ_ERR);
1113 }
1114 } else {
1115 /* recycle SQE */
1116 smp_store_mb(sqe->flags, 0);
1117 }
1118 return rv;
1119 }
1120
siw_rqe_complete(struct siw_qp * qp,struct siw_rqe * rqe,u32 bytes,u32 inval_stag,enum siw_wc_status status)1121 int siw_rqe_complete(struct siw_qp *qp, struct siw_rqe *rqe, u32 bytes,
1122 u32 inval_stag, enum siw_wc_status status)
1123 {
1124 struct siw_cq *cq = qp->rcq;
1125 int rv = 0;
1126
1127 if (cq) {
1128 struct siw_cqe *cqe;
1129 u32 idx;
1130 unsigned long flags;
1131
1132 spin_lock_irqsave(&cq->lock, flags);
1133
1134 idx = cq->cq_put % cq->num_cqe;
1135 cqe = &cq->queue[idx];
1136
1137 if (!READ_ONCE(cqe->flags)) {
1138 bool notify;
1139 u8 cqe_flags = SIW_WQE_VALID;
1140
1141 cqe->id = rqe->id;
1142 cqe->opcode = SIW_OP_RECEIVE;
1143 cqe->status = status;
1144 cqe->imm_data = 0;
1145 cqe->bytes = bytes;
1146
1147 if (rdma_is_kernel_res(&cq->base_cq.res)) {
1148 cqe->base_qp = &qp->base_qp;
1149 if (inval_stag) {
1150 cqe_flags |= SIW_WQE_REM_INVAL;
1151 cqe->inval_stag = inval_stag;
1152 }
1153 } else {
1154 cqe->qp_id = qp_id(qp);
1155 }
1156 /* mark CQE valid for application */
1157 WRITE_ONCE(cqe->flags, cqe_flags);
1158 /* recycle RQE */
1159 smp_store_mb(rqe->flags, 0);
1160
1161 cq->cq_put++;
1162 notify = siw_cq_notify_now(cq, SIW_WQE_SIGNALLED);
1163
1164 spin_unlock_irqrestore(&cq->lock, flags);
1165
1166 if (notify) {
1167 siw_dbg_cq(cq, "Call completion handler\n");
1168 cq->base_cq.comp_handler(&cq->base_cq,
1169 cq->base_cq.cq_context);
1170 }
1171 } else {
1172 spin_unlock_irqrestore(&cq->lock, flags);
1173 rv = -ENOMEM;
1174 siw_cq_event(cq, IB_EVENT_CQ_ERR);
1175 }
1176 } else {
1177 /* recycle RQE */
1178 smp_store_mb(rqe->flags, 0);
1179 }
1180 return rv;
1181 }
1182
1183 /*
1184 * siw_sq_flush()
1185 *
1186 * Flush SQ and ORRQ entries to CQ.
1187 *
1188 * Must be called with QP state write lock held.
1189 * Therefore, SQ and ORQ lock must not be taken.
1190 */
siw_sq_flush(struct siw_qp * qp)1191 void siw_sq_flush(struct siw_qp *qp)
1192 {
1193 struct siw_sqe *sqe;
1194 struct siw_wqe *wqe = tx_wqe(qp);
1195 int async_event = 0;
1196
1197 /*
1198 * Start with completing any work currently on the ORQ
1199 */
1200 while (qp->attrs.orq_size) {
1201 sqe = &qp->orq[qp->orq_get % qp->attrs.orq_size];
1202 if (!READ_ONCE(sqe->flags))
1203 break;
1204
1205 if (siw_sqe_complete(qp, sqe, 0, SIW_WC_WR_FLUSH_ERR) != 0)
1206 break;
1207
1208 WRITE_ONCE(sqe->flags, 0);
1209 qp->orq_get++;
1210 }
1211 /*
1212 * Flush an in-progress WQE if present
1213 */
1214 if (wqe->wr_status != SIW_WR_IDLE) {
1215 siw_dbg_qp(qp, "flush current SQE, type %d, status %d\n",
1216 tx_type(wqe), wqe->wr_status);
1217
1218 siw_wqe_put_mem(wqe, tx_type(wqe));
1219
1220 if (tx_type(wqe) != SIW_OP_READ_RESPONSE &&
1221 ((tx_type(wqe) != SIW_OP_READ &&
1222 tx_type(wqe) != SIW_OP_READ_LOCAL_INV) ||
1223 wqe->wr_status == SIW_WR_QUEUED))
1224 /*
1225 * An in-progress Read Request is already in
1226 * the ORQ
1227 */
1228 siw_sqe_complete(qp, &wqe->sqe, wqe->bytes,
1229 SIW_WC_WR_FLUSH_ERR);
1230
1231 wqe->wr_status = SIW_WR_IDLE;
1232 }
1233 /*
1234 * Flush the Send Queue
1235 */
1236 while (qp->attrs.sq_size) {
1237 sqe = &qp->sendq[qp->sq_get % qp->attrs.sq_size];
1238 if (!READ_ONCE(sqe->flags))
1239 break;
1240
1241 async_event = 1;
1242 if (siw_sqe_complete(qp, sqe, 0, SIW_WC_WR_FLUSH_ERR) != 0)
1243 /*
1244 * Shall IB_EVENT_SQ_DRAINED be supressed if work
1245 * completion fails?
1246 */
1247 break;
1248
1249 WRITE_ONCE(sqe->flags, 0);
1250 qp->sq_get++;
1251 }
1252 if (async_event)
1253 siw_qp_event(qp, IB_EVENT_SQ_DRAINED);
1254 }
1255
1256 /*
1257 * siw_rq_flush()
1258 *
1259 * Flush recv queue entries to CQ. Also
1260 * takes care of pending active tagged and untagged
1261 * inbound transfers, which have target memory
1262 * referenced.
1263 *
1264 * Must be called with QP state write lock held.
1265 * Therefore, RQ lock must not be taken.
1266 */
siw_rq_flush(struct siw_qp * qp)1267 void siw_rq_flush(struct siw_qp *qp)
1268 {
1269 struct siw_wqe *wqe = &qp->rx_untagged.wqe_active;
1270
1271 /*
1272 * Flush an in-progress untagged operation if present
1273 */
1274 if (wqe->wr_status != SIW_WR_IDLE) {
1275 siw_dbg_qp(qp, "flush current rqe, type %d, status %d\n",
1276 rx_type(wqe), wqe->wr_status);
1277
1278 siw_wqe_put_mem(wqe, rx_type(wqe));
1279
1280 if (rx_type(wqe) == SIW_OP_RECEIVE) {
1281 siw_rqe_complete(qp, &wqe->rqe, wqe->bytes,
1282 0, SIW_WC_WR_FLUSH_ERR);
1283 } else if (rx_type(wqe) != SIW_OP_READ &&
1284 rx_type(wqe) != SIW_OP_READ_RESPONSE &&
1285 rx_type(wqe) != SIW_OP_WRITE) {
1286 siw_sqe_complete(qp, &wqe->sqe, 0, SIW_WC_WR_FLUSH_ERR);
1287 }
1288 wqe->wr_status = SIW_WR_IDLE;
1289 }
1290 wqe = &qp->rx_tagged.wqe_active;
1291
1292 if (wqe->wr_status != SIW_WR_IDLE) {
1293 siw_wqe_put_mem(wqe, rx_type(wqe));
1294 wqe->wr_status = SIW_WR_IDLE;
1295 }
1296 /*
1297 * Flush the Receive Queue
1298 */
1299 while (qp->attrs.rq_size) {
1300 struct siw_rqe *rqe =
1301 &qp->recvq[qp->rq_get % qp->attrs.rq_size];
1302
1303 if (!READ_ONCE(rqe->flags))
1304 break;
1305
1306 if (siw_rqe_complete(qp, rqe, 0, 0, SIW_WC_WR_FLUSH_ERR) != 0)
1307 break;
1308
1309 WRITE_ONCE(rqe->flags, 0);
1310 qp->rq_get++;
1311 }
1312 }
1313
siw_qp_add(struct siw_device * sdev,struct siw_qp * qp)1314 int siw_qp_add(struct siw_device *sdev, struct siw_qp *qp)
1315 {
1316 int rv = xa_alloc(&sdev->qp_xa, &qp->base_qp.qp_num, qp, xa_limit_32b,
1317 GFP_KERNEL);
1318
1319 if (!rv) {
1320 kref_init(&qp->ref);
1321 qp->sdev = sdev;
1322 siw_dbg_qp(qp, "new QP\n");
1323 }
1324 return rv;
1325 }
1326
siw_free_qp(struct kref * ref)1327 void siw_free_qp(struct kref *ref)
1328 {
1329 struct siw_qp *found, *qp = container_of(ref, struct siw_qp, ref);
1330 struct siw_device *sdev = qp->sdev;
1331 unsigned long flags;
1332
1333 if (qp->cep)
1334 siw_cep_put(qp->cep);
1335
1336 found = xa_erase(&sdev->qp_xa, qp_id(qp));
1337 WARN_ON(found != qp);
1338 spin_lock_irqsave(&sdev->lock, flags);
1339 list_del(&qp->devq);
1340 spin_unlock_irqrestore(&sdev->lock, flags);
1341
1342 vfree(qp->sendq);
1343 vfree(qp->recvq);
1344 vfree(qp->irq);
1345 vfree(qp->orq);
1346
1347 siw_put_tx_cpu(qp->tx_cpu);
1348 complete(&qp->qp_free);
1349 atomic_dec(&sdev->num_qp);
1350 }
1351