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Merge tag 'mac80211-for-davem-2016-09-13' of git://git.kernel.org/pub/scm/linux/kerne...
[deliverable/linux.git] / net / sunrpc / xprtrdma / svc_rdma_transport.c
1 /*
2 * Copyright (c) 2014 Open Grid Computing, Inc. All rights reserved.
3 * Copyright (c) 2005-2007 Network Appliance, 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 BSD-type
9 * license below:
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 *
15 * Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 *
18 * Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials provided
21 * with the distribution.
22 *
23 * Neither the name of the Network Appliance, Inc. nor the names of
24 * its contributors may be used to endorse or promote products
25 * derived from this software without specific prior written
26 * permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 *
40 * Author: Tom Tucker <tom@opengridcomputing.com>
41 */
42
43 #include <linux/sunrpc/svc_xprt.h>
44 #include <linux/sunrpc/debug.h>
45 #include <linux/sunrpc/rpc_rdma.h>
46 #include <linux/interrupt.h>
47 #include <linux/sched.h>
48 #include <linux/slab.h>
49 #include <linux/spinlock.h>
50 #include <linux/workqueue.h>
51 #include <rdma/ib_verbs.h>
52 #include <rdma/rdma_cm.h>
53 #include <linux/sunrpc/svc_rdma.h>
54 #include <linux/export.h>
55 #include "xprt_rdma.h"
56
57 #define RPCDBG_FACILITY RPCDBG_SVCXPRT
58
59 static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *, int);
60 static struct svc_xprt *svc_rdma_create(struct svc_serv *serv,
61 struct net *net,
62 struct sockaddr *sa, int salen,
63 int flags);
64 static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt);
65 static void svc_rdma_release_rqst(struct svc_rqst *);
66 static void svc_rdma_detach(struct svc_xprt *xprt);
67 static void svc_rdma_free(struct svc_xprt *xprt);
68 static int svc_rdma_has_wspace(struct svc_xprt *xprt);
69 static int svc_rdma_secure_port(struct svc_rqst *);
70
71 static struct svc_xprt_ops svc_rdma_ops = {
72 .xpo_create = svc_rdma_create,
73 .xpo_recvfrom = svc_rdma_recvfrom,
74 .xpo_sendto = svc_rdma_sendto,
75 .xpo_release_rqst = svc_rdma_release_rqst,
76 .xpo_detach = svc_rdma_detach,
77 .xpo_free = svc_rdma_free,
78 .xpo_prep_reply_hdr = svc_rdma_prep_reply_hdr,
79 .xpo_has_wspace = svc_rdma_has_wspace,
80 .xpo_accept = svc_rdma_accept,
81 .xpo_secure_port = svc_rdma_secure_port,
82 };
83
84 struct svc_xprt_class svc_rdma_class = {
85 .xcl_name = "rdma",
86 .xcl_owner = THIS_MODULE,
87 .xcl_ops = &svc_rdma_ops,
88 .xcl_max_payload = RPCSVC_MAXPAYLOAD_RDMA,
89 .xcl_ident = XPRT_TRANSPORT_RDMA,
90 };
91
92 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
93 static struct svc_xprt *svc_rdma_bc_create(struct svc_serv *, struct net *,
94 struct sockaddr *, int, int);
95 static void svc_rdma_bc_detach(struct svc_xprt *);
96 static void svc_rdma_bc_free(struct svc_xprt *);
97
98 static struct svc_xprt_ops svc_rdma_bc_ops = {
99 .xpo_create = svc_rdma_bc_create,
100 .xpo_detach = svc_rdma_bc_detach,
101 .xpo_free = svc_rdma_bc_free,
102 .xpo_prep_reply_hdr = svc_rdma_prep_reply_hdr,
103 .xpo_secure_port = svc_rdma_secure_port,
104 };
105
106 struct svc_xprt_class svc_rdma_bc_class = {
107 .xcl_name = "rdma-bc",
108 .xcl_owner = THIS_MODULE,
109 .xcl_ops = &svc_rdma_bc_ops,
110 .xcl_max_payload = (1024 - RPCRDMA_HDRLEN_MIN)
111 };
112
113 static struct svc_xprt *svc_rdma_bc_create(struct svc_serv *serv,
114 struct net *net,
115 struct sockaddr *sa, int salen,
116 int flags)
117 {
118 struct svcxprt_rdma *cma_xprt;
119 struct svc_xprt *xprt;
120
121 cma_xprt = rdma_create_xprt(serv, 0);
122 if (!cma_xprt)
123 return ERR_PTR(-ENOMEM);
124 xprt = &cma_xprt->sc_xprt;
125
126 svc_xprt_init(net, &svc_rdma_bc_class, xprt, serv);
127 serv->sv_bc_xprt = xprt;
128
129 dprintk("svcrdma: %s(%p)\n", __func__, xprt);
130 return xprt;
131 }
132
133 static void svc_rdma_bc_detach(struct svc_xprt *xprt)
134 {
135 dprintk("svcrdma: %s(%p)\n", __func__, xprt);
136 }
137
138 static void svc_rdma_bc_free(struct svc_xprt *xprt)
139 {
140 struct svcxprt_rdma *rdma =
141 container_of(xprt, struct svcxprt_rdma, sc_xprt);
142
143 dprintk("svcrdma: %s(%p)\n", __func__, xprt);
144 if (xprt)
145 kfree(rdma);
146 }
147 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
148
149 static struct svc_rdma_op_ctxt *alloc_ctxt(struct svcxprt_rdma *xprt,
150 gfp_t flags)
151 {
152 struct svc_rdma_op_ctxt *ctxt;
153
154 ctxt = kmalloc(sizeof(*ctxt), flags);
155 if (ctxt) {
156 ctxt->xprt = xprt;
157 INIT_LIST_HEAD(&ctxt->free);
158 INIT_LIST_HEAD(&ctxt->dto_q);
159 }
160 return ctxt;
161 }
162
163 static bool svc_rdma_prealloc_ctxts(struct svcxprt_rdma *xprt)
164 {
165 unsigned int i;
166
167 /* Each RPC/RDMA credit can consume a number of send
168 * and receive WQEs. One ctxt is allocated for each.
169 */
170 i = xprt->sc_sq_depth + xprt->sc_rq_depth;
171
172 while (i--) {
173 struct svc_rdma_op_ctxt *ctxt;
174
175 ctxt = alloc_ctxt(xprt, GFP_KERNEL);
176 if (!ctxt) {
177 dprintk("svcrdma: No memory for RDMA ctxt\n");
178 return false;
179 }
180 list_add(&ctxt->free, &xprt->sc_ctxts);
181 }
182 return true;
183 }
184
185 struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt)
186 {
187 struct svc_rdma_op_ctxt *ctxt = NULL;
188
189 spin_lock_bh(&xprt->sc_ctxt_lock);
190 xprt->sc_ctxt_used++;
191 if (list_empty(&xprt->sc_ctxts))
192 goto out_empty;
193
194 ctxt = list_first_entry(&xprt->sc_ctxts,
195 struct svc_rdma_op_ctxt, free);
196 list_del_init(&ctxt->free);
197 spin_unlock_bh(&xprt->sc_ctxt_lock);
198
199 out:
200 ctxt->count = 0;
201 ctxt->frmr = NULL;
202 return ctxt;
203
204 out_empty:
205 /* Either pre-allocation missed the mark, or send
206 * queue accounting is broken.
207 */
208 spin_unlock_bh(&xprt->sc_ctxt_lock);
209
210 ctxt = alloc_ctxt(xprt, GFP_NOIO);
211 if (ctxt)
212 goto out;
213
214 spin_lock_bh(&xprt->sc_ctxt_lock);
215 xprt->sc_ctxt_used--;
216 spin_unlock_bh(&xprt->sc_ctxt_lock);
217 WARN_ONCE(1, "svcrdma: empty RDMA ctxt list?\n");
218 return NULL;
219 }
220
221 void svc_rdma_unmap_dma(struct svc_rdma_op_ctxt *ctxt)
222 {
223 struct svcxprt_rdma *xprt = ctxt->xprt;
224 int i;
225 for (i = 0; i < ctxt->count && ctxt->sge[i].length; i++) {
226 /*
227 * Unmap the DMA addr in the SGE if the lkey matches
228 * the local_dma_lkey, otherwise, ignore it since it is
229 * an FRMR lkey and will be unmapped later when the
230 * last WR that uses it completes.
231 */
232 if (ctxt->sge[i].lkey == xprt->sc_pd->local_dma_lkey) {
233 atomic_dec(&xprt->sc_dma_used);
234 ib_dma_unmap_page(xprt->sc_cm_id->device,
235 ctxt->sge[i].addr,
236 ctxt->sge[i].length,
237 ctxt->direction);
238 }
239 }
240 }
241
242 void svc_rdma_put_context(struct svc_rdma_op_ctxt *ctxt, int free_pages)
243 {
244 struct svcxprt_rdma *xprt = ctxt->xprt;
245 int i;
246
247 if (free_pages)
248 for (i = 0; i < ctxt->count; i++)
249 put_page(ctxt->pages[i]);
250
251 spin_lock_bh(&xprt->sc_ctxt_lock);
252 xprt->sc_ctxt_used--;
253 list_add(&ctxt->free, &xprt->sc_ctxts);
254 spin_unlock_bh(&xprt->sc_ctxt_lock);
255 }
256
257 static void svc_rdma_destroy_ctxts(struct svcxprt_rdma *xprt)
258 {
259 while (!list_empty(&xprt->sc_ctxts)) {
260 struct svc_rdma_op_ctxt *ctxt;
261
262 ctxt = list_first_entry(&xprt->sc_ctxts,
263 struct svc_rdma_op_ctxt, free);
264 list_del(&ctxt->free);
265 kfree(ctxt);
266 }
267 }
268
269 static struct svc_rdma_req_map *alloc_req_map(gfp_t flags)
270 {
271 struct svc_rdma_req_map *map;
272
273 map = kmalloc(sizeof(*map), flags);
274 if (map)
275 INIT_LIST_HEAD(&map->free);
276 return map;
277 }
278
279 static bool svc_rdma_prealloc_maps(struct svcxprt_rdma *xprt)
280 {
281 unsigned int i;
282
283 /* One for each receive buffer on this connection. */
284 i = xprt->sc_max_requests;
285
286 while (i--) {
287 struct svc_rdma_req_map *map;
288
289 map = alloc_req_map(GFP_KERNEL);
290 if (!map) {
291 dprintk("svcrdma: No memory for request map\n");
292 return false;
293 }
294 list_add(&map->free, &xprt->sc_maps);
295 }
296 return true;
297 }
298
299 struct svc_rdma_req_map *svc_rdma_get_req_map(struct svcxprt_rdma *xprt)
300 {
301 struct svc_rdma_req_map *map = NULL;
302
303 spin_lock(&xprt->sc_map_lock);
304 if (list_empty(&xprt->sc_maps))
305 goto out_empty;
306
307 map = list_first_entry(&xprt->sc_maps,
308 struct svc_rdma_req_map, free);
309 list_del_init(&map->free);
310 spin_unlock(&xprt->sc_map_lock);
311
312 out:
313 map->count = 0;
314 return map;
315
316 out_empty:
317 spin_unlock(&xprt->sc_map_lock);
318
319 /* Pre-allocation amount was incorrect */
320 map = alloc_req_map(GFP_NOIO);
321 if (map)
322 goto out;
323
324 WARN_ONCE(1, "svcrdma: empty request map list?\n");
325 return NULL;
326 }
327
328 void svc_rdma_put_req_map(struct svcxprt_rdma *xprt,
329 struct svc_rdma_req_map *map)
330 {
331 spin_lock(&xprt->sc_map_lock);
332 list_add(&map->free, &xprt->sc_maps);
333 spin_unlock(&xprt->sc_map_lock);
334 }
335
336 static void svc_rdma_destroy_maps(struct svcxprt_rdma *xprt)
337 {
338 while (!list_empty(&xprt->sc_maps)) {
339 struct svc_rdma_req_map *map;
340
341 map = list_first_entry(&xprt->sc_maps,
342 struct svc_rdma_req_map, free);
343 list_del(&map->free);
344 kfree(map);
345 }
346 }
347
348 /* QP event handler */
349 static void qp_event_handler(struct ib_event *event, void *context)
350 {
351 struct svc_xprt *xprt = context;
352
353 switch (event->event) {
354 /* These are considered benign events */
355 case IB_EVENT_PATH_MIG:
356 case IB_EVENT_COMM_EST:
357 case IB_EVENT_SQ_DRAINED:
358 case IB_EVENT_QP_LAST_WQE_REACHED:
359 dprintk("svcrdma: QP event %s (%d) received for QP=%p\n",
360 ib_event_msg(event->event), event->event,
361 event->element.qp);
362 break;
363 /* These are considered fatal events */
364 case IB_EVENT_PATH_MIG_ERR:
365 case IB_EVENT_QP_FATAL:
366 case IB_EVENT_QP_REQ_ERR:
367 case IB_EVENT_QP_ACCESS_ERR:
368 case IB_EVENT_DEVICE_FATAL:
369 default:
370 dprintk("svcrdma: QP ERROR event %s (%d) received for QP=%p, "
371 "closing transport\n",
372 ib_event_msg(event->event), event->event,
373 event->element.qp);
374 set_bit(XPT_CLOSE, &xprt->xpt_flags);
375 break;
376 }
377 }
378
379 /**
380 * svc_rdma_wc_receive - Invoked by RDMA provider for each polled Receive WC
381 * @cq: completion queue
382 * @wc: completed WR
383 *
384 */
385 static void svc_rdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc)
386 {
387 struct svcxprt_rdma *xprt = cq->cq_context;
388 struct ib_cqe *cqe = wc->wr_cqe;
389 struct svc_rdma_op_ctxt *ctxt;
390
391 /* WARNING: Only wc->wr_cqe and wc->status are reliable */
392 ctxt = container_of(cqe, struct svc_rdma_op_ctxt, cqe);
393 ctxt->wc_status = wc->status;
394 svc_rdma_unmap_dma(ctxt);
395
396 if (wc->status != IB_WC_SUCCESS)
397 goto flushed;
398
399 /* All wc fields are now known to be valid */
400 ctxt->byte_len = wc->byte_len;
401 spin_lock(&xprt->sc_rq_dto_lock);
402 list_add_tail(&ctxt->dto_q, &xprt->sc_rq_dto_q);
403 spin_unlock(&xprt->sc_rq_dto_lock);
404
405 set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags);
406 if (test_bit(RDMAXPRT_CONN_PENDING, &xprt->sc_flags))
407 goto out;
408 svc_xprt_enqueue(&xprt->sc_xprt);
409 goto out;
410
411 flushed:
412 if (wc->status != IB_WC_WR_FLUSH_ERR)
413 pr_warn("svcrdma: receive: %s (%u/0x%x)\n",
414 ib_wc_status_msg(wc->status),
415 wc->status, wc->vendor_err);
416 set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
417 svc_rdma_put_context(ctxt, 1);
418
419 out:
420 svc_xprt_put(&xprt->sc_xprt);
421 }
422
423 static void svc_rdma_send_wc_common(struct svcxprt_rdma *xprt,
424 struct ib_wc *wc,
425 const char *opname)
426 {
427 if (wc->status != IB_WC_SUCCESS)
428 goto err;
429
430 out:
431 atomic_dec(&xprt->sc_sq_count);
432 wake_up(&xprt->sc_send_wait);
433 return;
434
435 err:
436 set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
437 if (wc->status != IB_WC_WR_FLUSH_ERR)
438 pr_err("svcrdma: %s: %s (%u/0x%x)\n",
439 opname, ib_wc_status_msg(wc->status),
440 wc->status, wc->vendor_err);
441 goto out;
442 }
443
444 static void svc_rdma_send_wc_common_put(struct ib_cq *cq, struct ib_wc *wc,
445 const char *opname)
446 {
447 struct svcxprt_rdma *xprt = cq->cq_context;
448
449 svc_rdma_send_wc_common(xprt, wc, opname);
450 svc_xprt_put(&xprt->sc_xprt);
451 }
452
453 /**
454 * svc_rdma_wc_send - Invoked by RDMA provider for each polled Send WC
455 * @cq: completion queue
456 * @wc: completed WR
457 *
458 */
459 void svc_rdma_wc_send(struct ib_cq *cq, struct ib_wc *wc)
460 {
461 struct ib_cqe *cqe = wc->wr_cqe;
462 struct svc_rdma_op_ctxt *ctxt;
463
464 svc_rdma_send_wc_common_put(cq, wc, "send");
465
466 ctxt = container_of(cqe, struct svc_rdma_op_ctxt, cqe);
467 svc_rdma_unmap_dma(ctxt);
468 svc_rdma_put_context(ctxt, 1);
469 }
470
471 /**
472 * svc_rdma_wc_write - Invoked by RDMA provider for each polled Write WC
473 * @cq: completion queue
474 * @wc: completed WR
475 *
476 */
477 void svc_rdma_wc_write(struct ib_cq *cq, struct ib_wc *wc)
478 {
479 struct ib_cqe *cqe = wc->wr_cqe;
480 struct svc_rdma_op_ctxt *ctxt;
481
482 svc_rdma_send_wc_common_put(cq, wc, "write");
483
484 ctxt = container_of(cqe, struct svc_rdma_op_ctxt, cqe);
485 svc_rdma_unmap_dma(ctxt);
486 svc_rdma_put_context(ctxt, 0);
487 }
488
489 /**
490 * svc_rdma_wc_reg - Invoked by RDMA provider for each polled FASTREG WC
491 * @cq: completion queue
492 * @wc: completed WR
493 *
494 */
495 void svc_rdma_wc_reg(struct ib_cq *cq, struct ib_wc *wc)
496 {
497 svc_rdma_send_wc_common_put(cq, wc, "fastreg");
498 }
499
500 /**
501 * svc_rdma_wc_read - Invoked by RDMA provider for each polled Read WC
502 * @cq: completion queue
503 * @wc: completed WR
504 *
505 */
506 void svc_rdma_wc_read(struct ib_cq *cq, struct ib_wc *wc)
507 {
508 struct svcxprt_rdma *xprt = cq->cq_context;
509 struct ib_cqe *cqe = wc->wr_cqe;
510 struct svc_rdma_op_ctxt *ctxt;
511
512 svc_rdma_send_wc_common(xprt, wc, "read");
513
514 ctxt = container_of(cqe, struct svc_rdma_op_ctxt, cqe);
515 svc_rdma_unmap_dma(ctxt);
516 svc_rdma_put_frmr(xprt, ctxt->frmr);
517
518 if (test_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags)) {
519 struct svc_rdma_op_ctxt *read_hdr;
520
521 read_hdr = ctxt->read_hdr;
522 spin_lock(&xprt->sc_rq_dto_lock);
523 list_add_tail(&read_hdr->dto_q,
524 &xprt->sc_read_complete_q);
525 spin_unlock(&xprt->sc_rq_dto_lock);
526
527 set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags);
528 svc_xprt_enqueue(&xprt->sc_xprt);
529 }
530
531 svc_rdma_put_context(ctxt, 0);
532 svc_xprt_put(&xprt->sc_xprt);
533 }
534
535 /**
536 * svc_rdma_wc_inv - Invoked by RDMA provider for each polled LOCAL_INV WC
537 * @cq: completion queue
538 * @wc: completed WR
539 *
540 */
541 void svc_rdma_wc_inv(struct ib_cq *cq, struct ib_wc *wc)
542 {
543 svc_rdma_send_wc_common_put(cq, wc, "localInv");
544 }
545
546 static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *serv,
547 int listener)
548 {
549 struct svcxprt_rdma *cma_xprt = kzalloc(sizeof *cma_xprt, GFP_KERNEL);
550
551 if (!cma_xprt)
552 return NULL;
553 svc_xprt_init(&init_net, &svc_rdma_class, &cma_xprt->sc_xprt, serv);
554 INIT_LIST_HEAD(&cma_xprt->sc_accept_q);
555 INIT_LIST_HEAD(&cma_xprt->sc_dto_q);
556 INIT_LIST_HEAD(&cma_xprt->sc_rq_dto_q);
557 INIT_LIST_HEAD(&cma_xprt->sc_read_complete_q);
558 INIT_LIST_HEAD(&cma_xprt->sc_frmr_q);
559 INIT_LIST_HEAD(&cma_xprt->sc_ctxts);
560 INIT_LIST_HEAD(&cma_xprt->sc_maps);
561 init_waitqueue_head(&cma_xprt->sc_send_wait);
562
563 spin_lock_init(&cma_xprt->sc_lock);
564 spin_lock_init(&cma_xprt->sc_rq_dto_lock);
565 spin_lock_init(&cma_xprt->sc_frmr_q_lock);
566 spin_lock_init(&cma_xprt->sc_ctxt_lock);
567 spin_lock_init(&cma_xprt->sc_map_lock);
568
569 if (listener)
570 set_bit(XPT_LISTENER, &cma_xprt->sc_xprt.xpt_flags);
571
572 return cma_xprt;
573 }
574
575 int svc_rdma_post_recv(struct svcxprt_rdma *xprt, gfp_t flags)
576 {
577 struct ib_recv_wr recv_wr, *bad_recv_wr;
578 struct svc_rdma_op_ctxt *ctxt;
579 struct page *page;
580 dma_addr_t pa;
581 int sge_no;
582 int buflen;
583 int ret;
584
585 ctxt = svc_rdma_get_context(xprt);
586 buflen = 0;
587 ctxt->direction = DMA_FROM_DEVICE;
588 ctxt->cqe.done = svc_rdma_wc_receive;
589 for (sge_no = 0; buflen < xprt->sc_max_req_size; sge_no++) {
590 if (sge_no >= xprt->sc_max_sge) {
591 pr_err("svcrdma: Too many sges (%d)\n", sge_no);
592 goto err_put_ctxt;
593 }
594 page = alloc_page(flags);
595 if (!page)
596 goto err_put_ctxt;
597 ctxt->pages[sge_no] = page;
598 pa = ib_dma_map_page(xprt->sc_cm_id->device,
599 page, 0, PAGE_SIZE,
600 DMA_FROM_DEVICE);
601 if (ib_dma_mapping_error(xprt->sc_cm_id->device, pa))
602 goto err_put_ctxt;
603 atomic_inc(&xprt->sc_dma_used);
604 ctxt->sge[sge_no].addr = pa;
605 ctxt->sge[sge_no].length = PAGE_SIZE;
606 ctxt->sge[sge_no].lkey = xprt->sc_pd->local_dma_lkey;
607 ctxt->count = sge_no + 1;
608 buflen += PAGE_SIZE;
609 }
610 recv_wr.next = NULL;
611 recv_wr.sg_list = &ctxt->sge[0];
612 recv_wr.num_sge = ctxt->count;
613 recv_wr.wr_cqe = &ctxt->cqe;
614
615 svc_xprt_get(&xprt->sc_xprt);
616 ret = ib_post_recv(xprt->sc_qp, &recv_wr, &bad_recv_wr);
617 if (ret) {
618 svc_rdma_unmap_dma(ctxt);
619 svc_rdma_put_context(ctxt, 1);
620 svc_xprt_put(&xprt->sc_xprt);
621 }
622 return ret;
623
624 err_put_ctxt:
625 svc_rdma_unmap_dma(ctxt);
626 svc_rdma_put_context(ctxt, 1);
627 return -ENOMEM;
628 }
629
630 int svc_rdma_repost_recv(struct svcxprt_rdma *xprt, gfp_t flags)
631 {
632 int ret = 0;
633
634 ret = svc_rdma_post_recv(xprt, flags);
635 if (ret) {
636 pr_err("svcrdma: could not post a receive buffer, err=%d.\n",
637 ret);
638 pr_err("svcrdma: closing transport %p.\n", xprt);
639 set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
640 ret = -ENOTCONN;
641 }
642 return ret;
643 }
644
645 /*
646 * This function handles the CONNECT_REQUEST event on a listening
647 * endpoint. It is passed the cma_id for the _new_ connection. The context in
648 * this cma_id is inherited from the listening cma_id and is the svc_xprt
649 * structure for the listening endpoint.
650 *
651 * This function creates a new xprt for the new connection and enqueues it on
652 * the accept queue for the listent xprt. When the listen thread is kicked, it
653 * will call the recvfrom method on the listen xprt which will accept the new
654 * connection.
655 */
656 static void handle_connect_req(struct rdma_cm_id *new_cma_id, size_t client_ird)
657 {
658 struct svcxprt_rdma *listen_xprt = new_cma_id->context;
659 struct svcxprt_rdma *newxprt;
660 struct sockaddr *sa;
661
662 /* Create a new transport */
663 newxprt = rdma_create_xprt(listen_xprt->sc_xprt.xpt_server, 0);
664 if (!newxprt) {
665 dprintk("svcrdma: failed to create new transport\n");
666 return;
667 }
668 newxprt->sc_cm_id = new_cma_id;
669 new_cma_id->context = newxprt;
670 dprintk("svcrdma: Creating newxprt=%p, cm_id=%p, listenxprt=%p\n",
671 newxprt, newxprt->sc_cm_id, listen_xprt);
672
673 /* Save client advertised inbound read limit for use later in accept. */
674 newxprt->sc_ord = client_ird;
675
676 /* Set the local and remote addresses in the transport */
677 sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr;
678 svc_xprt_set_remote(&newxprt->sc_xprt, sa, svc_addr_len(sa));
679 sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr;
680 svc_xprt_set_local(&newxprt->sc_xprt, sa, svc_addr_len(sa));
681
682 /*
683 * Enqueue the new transport on the accept queue of the listening
684 * transport
685 */
686 spin_lock_bh(&listen_xprt->sc_lock);
687 list_add_tail(&newxprt->sc_accept_q, &listen_xprt->sc_accept_q);
688 spin_unlock_bh(&listen_xprt->sc_lock);
689
690 set_bit(XPT_CONN, &listen_xprt->sc_xprt.xpt_flags);
691 svc_xprt_enqueue(&listen_xprt->sc_xprt);
692 }
693
694 /*
695 * Handles events generated on the listening endpoint. These events will be
696 * either be incoming connect requests or adapter removal events.
697 */
698 static int rdma_listen_handler(struct rdma_cm_id *cma_id,
699 struct rdma_cm_event *event)
700 {
701 struct svcxprt_rdma *xprt = cma_id->context;
702 int ret = 0;
703
704 switch (event->event) {
705 case RDMA_CM_EVENT_CONNECT_REQUEST:
706 dprintk("svcrdma: Connect request on cma_id=%p, xprt = %p, "
707 "event = %s (%d)\n", cma_id, cma_id->context,
708 rdma_event_msg(event->event), event->event);
709 handle_connect_req(cma_id,
710 event->param.conn.initiator_depth);
711 break;
712
713 case RDMA_CM_EVENT_ESTABLISHED:
714 /* Accept complete */
715 dprintk("svcrdma: Connection completed on LISTEN xprt=%p, "
716 "cm_id=%p\n", xprt, cma_id);
717 break;
718
719 case RDMA_CM_EVENT_DEVICE_REMOVAL:
720 dprintk("svcrdma: Device removal xprt=%p, cm_id=%p\n",
721 xprt, cma_id);
722 if (xprt)
723 set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
724 break;
725
726 default:
727 dprintk("svcrdma: Unexpected event on listening endpoint %p, "
728 "event = %s (%d)\n", cma_id,
729 rdma_event_msg(event->event), event->event);
730 break;
731 }
732
733 return ret;
734 }
735
736 static int rdma_cma_handler(struct rdma_cm_id *cma_id,
737 struct rdma_cm_event *event)
738 {
739 struct svc_xprt *xprt = cma_id->context;
740 struct svcxprt_rdma *rdma =
741 container_of(xprt, struct svcxprt_rdma, sc_xprt);
742 switch (event->event) {
743 case RDMA_CM_EVENT_ESTABLISHED:
744 /* Accept complete */
745 svc_xprt_get(xprt);
746 dprintk("svcrdma: Connection completed on DTO xprt=%p, "
747 "cm_id=%p\n", xprt, cma_id);
748 clear_bit(RDMAXPRT_CONN_PENDING, &rdma->sc_flags);
749 svc_xprt_enqueue(xprt);
750 break;
751 case RDMA_CM_EVENT_DISCONNECTED:
752 dprintk("svcrdma: Disconnect on DTO xprt=%p, cm_id=%p\n",
753 xprt, cma_id);
754 if (xprt) {
755 set_bit(XPT_CLOSE, &xprt->xpt_flags);
756 svc_xprt_enqueue(xprt);
757 svc_xprt_put(xprt);
758 }
759 break;
760 case RDMA_CM_EVENT_DEVICE_REMOVAL:
761 dprintk("svcrdma: Device removal cma_id=%p, xprt = %p, "
762 "event = %s (%d)\n", cma_id, xprt,
763 rdma_event_msg(event->event), event->event);
764 if (xprt) {
765 set_bit(XPT_CLOSE, &xprt->xpt_flags);
766 svc_xprt_enqueue(xprt);
767 svc_xprt_put(xprt);
768 }
769 break;
770 default:
771 dprintk("svcrdma: Unexpected event on DTO endpoint %p, "
772 "event = %s (%d)\n", cma_id,
773 rdma_event_msg(event->event), event->event);
774 break;
775 }
776 return 0;
777 }
778
779 /*
780 * Create a listening RDMA service endpoint.
781 */
782 static struct svc_xprt *svc_rdma_create(struct svc_serv *serv,
783 struct net *net,
784 struct sockaddr *sa, int salen,
785 int flags)
786 {
787 struct rdma_cm_id *listen_id;
788 struct svcxprt_rdma *cma_xprt;
789 int ret;
790
791 dprintk("svcrdma: Creating RDMA socket\n");
792 if ((sa->sa_family != AF_INET) && (sa->sa_family != AF_INET6)) {
793 dprintk("svcrdma: Address family %d is not supported.\n", sa->sa_family);
794 return ERR_PTR(-EAFNOSUPPORT);
795 }
796 cma_xprt = rdma_create_xprt(serv, 1);
797 if (!cma_xprt)
798 return ERR_PTR(-ENOMEM);
799
800 listen_id = rdma_create_id(&init_net, rdma_listen_handler, cma_xprt,
801 RDMA_PS_TCP, IB_QPT_RC);
802 if (IS_ERR(listen_id)) {
803 ret = PTR_ERR(listen_id);
804 dprintk("svcrdma: rdma_create_id failed = %d\n", ret);
805 goto err0;
806 }
807
808 /* Allow both IPv4 and IPv6 sockets to bind a single port
809 * at the same time.
810 */
811 #if IS_ENABLED(CONFIG_IPV6)
812 ret = rdma_set_afonly(listen_id, 1);
813 if (ret) {
814 dprintk("svcrdma: rdma_set_afonly failed = %d\n", ret);
815 goto err1;
816 }
817 #endif
818 ret = rdma_bind_addr(listen_id, sa);
819 if (ret) {
820 dprintk("svcrdma: rdma_bind_addr failed = %d\n", ret);
821 goto err1;
822 }
823 cma_xprt->sc_cm_id = listen_id;
824
825 ret = rdma_listen(listen_id, RPCRDMA_LISTEN_BACKLOG);
826 if (ret) {
827 dprintk("svcrdma: rdma_listen failed = %d\n", ret);
828 goto err1;
829 }
830
831 /*
832 * We need to use the address from the cm_id in case the
833 * caller specified 0 for the port number.
834 */
835 sa = (struct sockaddr *)&cma_xprt->sc_cm_id->route.addr.src_addr;
836 svc_xprt_set_local(&cma_xprt->sc_xprt, sa, salen);
837
838 return &cma_xprt->sc_xprt;
839
840 err1:
841 rdma_destroy_id(listen_id);
842 err0:
843 kfree(cma_xprt);
844 return ERR_PTR(ret);
845 }
846
847 static struct svc_rdma_fastreg_mr *rdma_alloc_frmr(struct svcxprt_rdma *xprt)
848 {
849 struct ib_mr *mr;
850 struct scatterlist *sg;
851 struct svc_rdma_fastreg_mr *frmr;
852 u32 num_sg;
853
854 frmr = kmalloc(sizeof(*frmr), GFP_KERNEL);
855 if (!frmr)
856 goto err;
857
858 num_sg = min_t(u32, RPCSVC_MAXPAGES, xprt->sc_frmr_pg_list_len);
859 mr = ib_alloc_mr(xprt->sc_pd, IB_MR_TYPE_MEM_REG, num_sg);
860 if (IS_ERR(mr))
861 goto err_free_frmr;
862
863 sg = kcalloc(RPCSVC_MAXPAGES, sizeof(*sg), GFP_KERNEL);
864 if (!sg)
865 goto err_free_mr;
866
867 sg_init_table(sg, RPCSVC_MAXPAGES);
868
869 frmr->mr = mr;
870 frmr->sg = sg;
871 INIT_LIST_HEAD(&frmr->frmr_list);
872 return frmr;
873
874 err_free_mr:
875 ib_dereg_mr(mr);
876 err_free_frmr:
877 kfree(frmr);
878 err:
879 return ERR_PTR(-ENOMEM);
880 }
881
882 static void rdma_dealloc_frmr_q(struct svcxprt_rdma *xprt)
883 {
884 struct svc_rdma_fastreg_mr *frmr;
885
886 while (!list_empty(&xprt->sc_frmr_q)) {
887 frmr = list_entry(xprt->sc_frmr_q.next,
888 struct svc_rdma_fastreg_mr, frmr_list);
889 list_del_init(&frmr->frmr_list);
890 kfree(frmr->sg);
891 ib_dereg_mr(frmr->mr);
892 kfree(frmr);
893 }
894 }
895
896 struct svc_rdma_fastreg_mr *svc_rdma_get_frmr(struct svcxprt_rdma *rdma)
897 {
898 struct svc_rdma_fastreg_mr *frmr = NULL;
899
900 spin_lock_bh(&rdma->sc_frmr_q_lock);
901 if (!list_empty(&rdma->sc_frmr_q)) {
902 frmr = list_entry(rdma->sc_frmr_q.next,
903 struct svc_rdma_fastreg_mr, frmr_list);
904 list_del_init(&frmr->frmr_list);
905 frmr->sg_nents = 0;
906 }
907 spin_unlock_bh(&rdma->sc_frmr_q_lock);
908 if (frmr)
909 return frmr;
910
911 return rdma_alloc_frmr(rdma);
912 }
913
914 void svc_rdma_put_frmr(struct svcxprt_rdma *rdma,
915 struct svc_rdma_fastreg_mr *frmr)
916 {
917 if (frmr) {
918 ib_dma_unmap_sg(rdma->sc_cm_id->device,
919 frmr->sg, frmr->sg_nents, frmr->direction);
920 atomic_dec(&rdma->sc_dma_used);
921 spin_lock_bh(&rdma->sc_frmr_q_lock);
922 WARN_ON_ONCE(!list_empty(&frmr->frmr_list));
923 list_add(&frmr->frmr_list, &rdma->sc_frmr_q);
924 spin_unlock_bh(&rdma->sc_frmr_q_lock);
925 }
926 }
927
928 /*
929 * This is the xpo_recvfrom function for listening endpoints. Its
930 * purpose is to accept incoming connections. The CMA callback handler
931 * has already created a new transport and attached it to the new CMA
932 * ID.
933 *
934 * There is a queue of pending connections hung on the listening
935 * transport. This queue contains the new svc_xprt structure. This
936 * function takes svc_xprt structures off the accept_q and completes
937 * the connection.
938 */
939 static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
940 {
941 struct svcxprt_rdma *listen_rdma;
942 struct svcxprt_rdma *newxprt = NULL;
943 struct rdma_conn_param conn_param;
944 struct ib_qp_init_attr qp_attr;
945 struct ib_device *dev;
946 unsigned int i;
947 int ret = 0;
948
949 listen_rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt);
950 clear_bit(XPT_CONN, &xprt->xpt_flags);
951 /* Get the next entry off the accept list */
952 spin_lock_bh(&listen_rdma->sc_lock);
953 if (!list_empty(&listen_rdma->sc_accept_q)) {
954 newxprt = list_entry(listen_rdma->sc_accept_q.next,
955 struct svcxprt_rdma, sc_accept_q);
956 list_del_init(&newxprt->sc_accept_q);
957 }
958 if (!list_empty(&listen_rdma->sc_accept_q))
959 set_bit(XPT_CONN, &listen_rdma->sc_xprt.xpt_flags);
960 spin_unlock_bh(&listen_rdma->sc_lock);
961 if (!newxprt)
962 return NULL;
963
964 dprintk("svcrdma: newxprt from accept queue = %p, cm_id=%p\n",
965 newxprt, newxprt->sc_cm_id);
966
967 dev = newxprt->sc_cm_id->device;
968
969 /* Qualify the transport resource defaults with the
970 * capabilities of this particular device */
971 newxprt->sc_max_sge = min((size_t)dev->attrs.max_sge,
972 (size_t)RPCSVC_MAXPAGES);
973 newxprt->sc_max_sge_rd = min_t(size_t, dev->attrs.max_sge_rd,
974 RPCSVC_MAXPAGES);
975 newxprt->sc_max_req_size = svcrdma_max_req_size;
976 newxprt->sc_max_requests = min_t(u32, dev->attrs.max_qp_wr,
977 svcrdma_max_requests);
978 newxprt->sc_max_bc_requests = min_t(u32, dev->attrs.max_qp_wr,
979 svcrdma_max_bc_requests);
980 newxprt->sc_rq_depth = newxprt->sc_max_requests +
981 newxprt->sc_max_bc_requests;
982 newxprt->sc_sq_depth = RPCRDMA_SQ_DEPTH_MULT * newxprt->sc_rq_depth;
983
984 if (!svc_rdma_prealloc_ctxts(newxprt))
985 goto errout;
986 if (!svc_rdma_prealloc_maps(newxprt))
987 goto errout;
988
989 /*
990 * Limit ORD based on client limit, local device limit, and
991 * configured svcrdma limit.
992 */
993 newxprt->sc_ord = min_t(size_t, dev->attrs.max_qp_rd_atom, newxprt->sc_ord);
994 newxprt->sc_ord = min_t(size_t, svcrdma_ord, newxprt->sc_ord);
995
996 newxprt->sc_pd = ib_alloc_pd(dev);
997 if (IS_ERR(newxprt->sc_pd)) {
998 dprintk("svcrdma: error creating PD for connect request\n");
999 goto errout;
1000 }
1001 newxprt->sc_sq_cq = ib_alloc_cq(dev, newxprt, newxprt->sc_sq_depth,
1002 0, IB_POLL_SOFTIRQ);
1003 if (IS_ERR(newxprt->sc_sq_cq)) {
1004 dprintk("svcrdma: error creating SQ CQ for connect request\n");
1005 goto errout;
1006 }
1007 newxprt->sc_rq_cq = ib_alloc_cq(dev, newxprt, newxprt->sc_rq_depth,
1008 0, IB_POLL_SOFTIRQ);
1009 if (IS_ERR(newxprt->sc_rq_cq)) {
1010 dprintk("svcrdma: error creating RQ CQ for connect request\n");
1011 goto errout;
1012 }
1013
1014 memset(&qp_attr, 0, sizeof qp_attr);
1015 qp_attr.event_handler = qp_event_handler;
1016 qp_attr.qp_context = &newxprt->sc_xprt;
1017 qp_attr.cap.max_send_wr = newxprt->sc_sq_depth;
1018 qp_attr.cap.max_recv_wr = newxprt->sc_rq_depth;
1019 qp_attr.cap.max_send_sge = newxprt->sc_max_sge;
1020 qp_attr.cap.max_recv_sge = newxprt->sc_max_sge;
1021 qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
1022 qp_attr.qp_type = IB_QPT_RC;
1023 qp_attr.send_cq = newxprt->sc_sq_cq;
1024 qp_attr.recv_cq = newxprt->sc_rq_cq;
1025 dprintk("svcrdma: newxprt->sc_cm_id=%p, newxprt->sc_pd=%p\n"
1026 " cm_id->device=%p, sc_pd->device=%p\n"
1027 " cap.max_send_wr = %d\n"
1028 " cap.max_recv_wr = %d\n"
1029 " cap.max_send_sge = %d\n"
1030 " cap.max_recv_sge = %d\n",
1031 newxprt->sc_cm_id, newxprt->sc_pd,
1032 dev, newxprt->sc_pd->device,
1033 qp_attr.cap.max_send_wr,
1034 qp_attr.cap.max_recv_wr,
1035 qp_attr.cap.max_send_sge,
1036 qp_attr.cap.max_recv_sge);
1037
1038 ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd, &qp_attr);
1039 if (ret) {
1040 dprintk("svcrdma: failed to create QP, ret=%d\n", ret);
1041 goto errout;
1042 }
1043 newxprt->sc_qp = newxprt->sc_cm_id->qp;
1044
1045 /*
1046 * Use the most secure set of MR resources based on the
1047 * transport type and available memory management features in
1048 * the device. Here's the table implemented below:
1049 *
1050 * Fast Global DMA Remote WR
1051 * Reg LKEY MR Access
1052 * Sup'd Sup'd Needed Needed
1053 *
1054 * IWARP N N Y Y
1055 * N Y Y Y
1056 * Y N Y N
1057 * Y Y N -
1058 *
1059 * IB N N Y N
1060 * N Y N -
1061 * Y N Y N
1062 * Y Y N -
1063 *
1064 * NB: iWARP requires remote write access for the data sink
1065 * of an RDMA_READ. IB does not.
1066 */
1067 newxprt->sc_reader = rdma_read_chunk_lcl;
1068 if (dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) {
1069 newxprt->sc_frmr_pg_list_len =
1070 dev->attrs.max_fast_reg_page_list_len;
1071 newxprt->sc_dev_caps |= SVCRDMA_DEVCAP_FAST_REG;
1072 newxprt->sc_reader = rdma_read_chunk_frmr;
1073 }
1074
1075 /*
1076 * Determine if a DMA MR is required and if so, what privs are required
1077 */
1078 if (!rdma_protocol_iwarp(dev, newxprt->sc_cm_id->port_num) &&
1079 !rdma_ib_or_roce(dev, newxprt->sc_cm_id->port_num))
1080 goto errout;
1081
1082 if (rdma_protocol_iwarp(dev, newxprt->sc_cm_id->port_num))
1083 newxprt->sc_dev_caps |= SVCRDMA_DEVCAP_READ_W_INV;
1084
1085 /* Post receive buffers */
1086 for (i = 0; i < newxprt->sc_max_requests; i++) {
1087 ret = svc_rdma_post_recv(newxprt, GFP_KERNEL);
1088 if (ret) {
1089 dprintk("svcrdma: failure posting receive buffers\n");
1090 goto errout;
1091 }
1092 }
1093
1094 /* Swap out the handler */
1095 newxprt->sc_cm_id->event_handler = rdma_cma_handler;
1096
1097 /* Accept Connection */
1098 set_bit(RDMAXPRT_CONN_PENDING, &newxprt->sc_flags);
1099 memset(&conn_param, 0, sizeof conn_param);
1100 conn_param.responder_resources = 0;
1101 conn_param.initiator_depth = newxprt->sc_ord;
1102 ret = rdma_accept(newxprt->sc_cm_id, &conn_param);
1103 if (ret) {
1104 dprintk("svcrdma: failed to accept new connection, ret=%d\n",
1105 ret);
1106 goto errout;
1107 }
1108
1109 dprintk("svcrdma: new connection %p accepted with the following "
1110 "attributes:\n"
1111 " local_ip : %pI4\n"
1112 " local_port : %d\n"
1113 " remote_ip : %pI4\n"
1114 " remote_port : %d\n"
1115 " max_sge : %d\n"
1116 " max_sge_rd : %d\n"
1117 " sq_depth : %d\n"
1118 " max_requests : %d\n"
1119 " ord : %d\n",
1120 newxprt,
1121 &((struct sockaddr_in *)&newxprt->sc_cm_id->
1122 route.addr.src_addr)->sin_addr.s_addr,
1123 ntohs(((struct sockaddr_in *)&newxprt->sc_cm_id->
1124 route.addr.src_addr)->sin_port),
1125 &((struct sockaddr_in *)&newxprt->sc_cm_id->
1126 route.addr.dst_addr)->sin_addr.s_addr,
1127 ntohs(((struct sockaddr_in *)&newxprt->sc_cm_id->
1128 route.addr.dst_addr)->sin_port),
1129 newxprt->sc_max_sge,
1130 newxprt->sc_max_sge_rd,
1131 newxprt->sc_sq_depth,
1132 newxprt->sc_max_requests,
1133 newxprt->sc_ord);
1134
1135 return &newxprt->sc_xprt;
1136
1137 errout:
1138 dprintk("svcrdma: failure accepting new connection rc=%d.\n", ret);
1139 /* Take a reference in case the DTO handler runs */
1140 svc_xprt_get(&newxprt->sc_xprt);
1141 if (newxprt->sc_qp && !IS_ERR(newxprt->sc_qp))
1142 ib_destroy_qp(newxprt->sc_qp);
1143 rdma_destroy_id(newxprt->sc_cm_id);
1144 /* This call to put will destroy the transport */
1145 svc_xprt_put(&newxprt->sc_xprt);
1146 return NULL;
1147 }
1148
1149 static void svc_rdma_release_rqst(struct svc_rqst *rqstp)
1150 {
1151 }
1152
1153 /*
1154 * When connected, an svc_xprt has at least two references:
1155 *
1156 * - A reference held by the cm_id between the ESTABLISHED and
1157 * DISCONNECTED events. If the remote peer disconnected first, this
1158 * reference could be gone.
1159 *
1160 * - A reference held by the svc_recv code that called this function
1161 * as part of close processing.
1162 *
1163 * At a minimum one references should still be held.
1164 */
1165 static void svc_rdma_detach(struct svc_xprt *xprt)
1166 {
1167 struct svcxprt_rdma *rdma =
1168 container_of(xprt, struct svcxprt_rdma, sc_xprt);
1169 dprintk("svc: svc_rdma_detach(%p)\n", xprt);
1170
1171 /* Disconnect and flush posted WQE */
1172 rdma_disconnect(rdma->sc_cm_id);
1173 }
1174
1175 static void __svc_rdma_free(struct work_struct *work)
1176 {
1177 struct svcxprt_rdma *rdma =
1178 container_of(work, struct svcxprt_rdma, sc_work);
1179 struct svc_xprt *xprt = &rdma->sc_xprt;
1180
1181 dprintk("svcrdma: %s(%p)\n", __func__, rdma);
1182
1183 if (rdma->sc_qp && !IS_ERR(rdma->sc_qp))
1184 ib_drain_qp(rdma->sc_qp);
1185
1186 /* We should only be called from kref_put */
1187 if (atomic_read(&xprt->xpt_ref.refcount) != 0)
1188 pr_err("svcrdma: sc_xprt still in use? (%d)\n",
1189 atomic_read(&xprt->xpt_ref.refcount));
1190
1191 /*
1192 * Destroy queued, but not processed read completions. Note
1193 * that this cleanup has to be done before destroying the
1194 * cm_id because the device ptr is needed to unmap the dma in
1195 * svc_rdma_put_context.
1196 */
1197 while (!list_empty(&rdma->sc_read_complete_q)) {
1198 struct svc_rdma_op_ctxt *ctxt;
1199 ctxt = list_entry(rdma->sc_read_complete_q.next,
1200 struct svc_rdma_op_ctxt,
1201 dto_q);
1202 list_del_init(&ctxt->dto_q);
1203 svc_rdma_put_context(ctxt, 1);
1204 }
1205
1206 /* Destroy queued, but not processed recv completions */
1207 while (!list_empty(&rdma->sc_rq_dto_q)) {
1208 struct svc_rdma_op_ctxt *ctxt;
1209 ctxt = list_entry(rdma->sc_rq_dto_q.next,
1210 struct svc_rdma_op_ctxt,
1211 dto_q);
1212 list_del_init(&ctxt->dto_q);
1213 svc_rdma_put_context(ctxt, 1);
1214 }
1215
1216 /* Warn if we leaked a resource or under-referenced */
1217 if (rdma->sc_ctxt_used != 0)
1218 pr_err("svcrdma: ctxt still in use? (%d)\n",
1219 rdma->sc_ctxt_used);
1220 if (atomic_read(&rdma->sc_dma_used) != 0)
1221 pr_err("svcrdma: dma still in use? (%d)\n",
1222 atomic_read(&rdma->sc_dma_used));
1223
1224 /* Final put of backchannel client transport */
1225 if (xprt->xpt_bc_xprt) {
1226 xprt_put(xprt->xpt_bc_xprt);
1227 xprt->xpt_bc_xprt = NULL;
1228 }
1229
1230 rdma_dealloc_frmr_q(rdma);
1231 svc_rdma_destroy_ctxts(rdma);
1232 svc_rdma_destroy_maps(rdma);
1233
1234 /* Destroy the QP if present (not a listener) */
1235 if (rdma->sc_qp && !IS_ERR(rdma->sc_qp))
1236 ib_destroy_qp(rdma->sc_qp);
1237
1238 if (rdma->sc_sq_cq && !IS_ERR(rdma->sc_sq_cq))
1239 ib_free_cq(rdma->sc_sq_cq);
1240
1241 if (rdma->sc_rq_cq && !IS_ERR(rdma->sc_rq_cq))
1242 ib_free_cq(rdma->sc_rq_cq);
1243
1244 if (rdma->sc_pd && !IS_ERR(rdma->sc_pd))
1245 ib_dealloc_pd(rdma->sc_pd);
1246
1247 /* Destroy the CM ID */
1248 rdma_destroy_id(rdma->sc_cm_id);
1249
1250 kfree(rdma);
1251 }
1252
1253 static void svc_rdma_free(struct svc_xprt *xprt)
1254 {
1255 struct svcxprt_rdma *rdma =
1256 container_of(xprt, struct svcxprt_rdma, sc_xprt);
1257 INIT_WORK(&rdma->sc_work, __svc_rdma_free);
1258 queue_work(svc_rdma_wq, &rdma->sc_work);
1259 }
1260
1261 static int svc_rdma_has_wspace(struct svc_xprt *xprt)
1262 {
1263 struct svcxprt_rdma *rdma =
1264 container_of(xprt, struct svcxprt_rdma, sc_xprt);
1265
1266 /*
1267 * If there are already waiters on the SQ,
1268 * return false.
1269 */
1270 if (waitqueue_active(&rdma->sc_send_wait))
1271 return 0;
1272
1273 /* Otherwise return true. */
1274 return 1;
1275 }
1276
1277 static int svc_rdma_secure_port(struct svc_rqst *rqstp)
1278 {
1279 return 1;
1280 }
1281
1282 int svc_rdma_send(struct svcxprt_rdma *xprt, struct ib_send_wr *wr)
1283 {
1284 struct ib_send_wr *bad_wr, *n_wr;
1285 int wr_count;
1286 int i;
1287 int ret;
1288
1289 if (test_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags))
1290 return -ENOTCONN;
1291
1292 wr_count = 1;
1293 for (n_wr = wr->next; n_wr; n_wr = n_wr->next)
1294 wr_count++;
1295
1296 /* If the SQ is full, wait until an SQ entry is available */
1297 while (1) {
1298 spin_lock_bh(&xprt->sc_lock);
1299 if (xprt->sc_sq_depth < atomic_read(&xprt->sc_sq_count) + wr_count) {
1300 spin_unlock_bh(&xprt->sc_lock);
1301 atomic_inc(&rdma_stat_sq_starve);
1302
1303 /* Wait until SQ WR available if SQ still full */
1304 wait_event(xprt->sc_send_wait,
1305 atomic_read(&xprt->sc_sq_count) <
1306 xprt->sc_sq_depth);
1307 if (test_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags))
1308 return -ENOTCONN;
1309 continue;
1310 }
1311 /* Take a transport ref for each WR posted */
1312 for (i = 0; i < wr_count; i++)
1313 svc_xprt_get(&xprt->sc_xprt);
1314
1315 /* Bump used SQ WR count and post */
1316 atomic_add(wr_count, &xprt->sc_sq_count);
1317 ret = ib_post_send(xprt->sc_qp, wr, &bad_wr);
1318 if (ret) {
1319 set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags);
1320 atomic_sub(wr_count, &xprt->sc_sq_count);
1321 for (i = 0; i < wr_count; i ++)
1322 svc_xprt_put(&xprt->sc_xprt);
1323 dprintk("svcrdma: failed to post SQ WR rc=%d, "
1324 "sc_sq_count=%d, sc_sq_depth=%d\n",
1325 ret, atomic_read(&xprt->sc_sq_count),
1326 xprt->sc_sq_depth);
1327 }
1328 spin_unlock_bh(&xprt->sc_lock);
1329 if (ret)
1330 wake_up(&xprt->sc_send_wait);
1331 break;
1332 }
1333 return ret;
1334 }
Linux kernel - Deliverables
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