rpcrdma: infrastructure for static trace points in rpcrdma.ko
[linux-2.6-block.git] / net / sunrpc / xprtrdma / verbs.c
CommitLineData
f58851e6 1/*
62b56a67 2 * Copyright (c) 2014-2017 Oracle. All rights reserved.
c56c65fb
TT
3 * Copyright (c) 2003-2007 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.
f58851e6
TT
39 */
40
c56c65fb
TT
41/*
42 * verbs.c
43 *
44 * Encapsulates the major functions managing:
45 * o adapters
46 * o endpoints
47 * o connections
48 * o buffer memory
49 */
50
a6b7a407 51#include <linux/interrupt.h>
5a0e3ad6 52#include <linux/slab.h>
0dd39cae 53#include <linux/sunrpc/addr.h>
05c97466 54#include <linux/sunrpc/svc_rdma.h>
ae72950a
CL
55
56#include <asm-generic/barrier.h>
65866f82 57#include <asm/bitops.h>
56a6bd15 58
0a90487b 59#include <rdma/ib_cm.h>
c56c65fb 60
f58851e6
TT
61#include "xprt_rdma.h"
62
c56c65fb
TT
63/*
64 * Globals/Macros
65 */
66
f895b252 67#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
c56c65fb
TT
68# define RPCDBG_FACILITY RPCDBG_TRANS
69#endif
70
71/*
72 * internal functions
73 */
96ceddea
CL
74static void rpcrdma_mrs_create(struct rpcrdma_xprt *r_xprt);
75static void rpcrdma_mrs_destroy(struct rpcrdma_buffer *buf);
bebd0318 76static void rpcrdma_dma_unmap_regbuf(struct rpcrdma_regbuf *rb);
c56c65fb 77
d8f532d2 78struct workqueue_struct *rpcrdma_receive_wq __read_mostly;
c56c65fb 79
fe97b47c
CL
80int
81rpcrdma_alloc_wq(void)
c56c65fb 82{
fe97b47c 83 struct workqueue_struct *recv_wq;
c56c65fb 84
fe97b47c 85 recv_wq = alloc_workqueue("xprtrdma_receive",
ccede759 86 WQ_MEM_RECLAIM | WQ_HIGHPRI,
fe97b47c
CL
87 0);
88 if (!recv_wq)
89 return -ENOMEM;
c56c65fb 90
fe97b47c
CL
91 rpcrdma_receive_wq = recv_wq;
92 return 0;
c56c65fb
TT
93}
94
fe97b47c
CL
95void
96rpcrdma_destroy_wq(void)
f1a03b76 97{
fe97b47c 98 struct workqueue_struct *wq;
f1a03b76 99
fe97b47c
CL
100 if (rpcrdma_receive_wq) {
101 wq = rpcrdma_receive_wq;
102 rpcrdma_receive_wq = NULL;
103 destroy_workqueue(wq);
104 }
f1a03b76
CL
105}
106
c56c65fb
TT
107static void
108rpcrdma_qp_async_error_upcall(struct ib_event *event, void *context)
109{
110 struct rpcrdma_ep *ep = context;
111
2f6922ca
CL
112 pr_err("rpcrdma: %s on device %s ep %p\n",
113 ib_event_msg(event->event), event->device->name, context);
114
c56c65fb
TT
115 if (ep->rep_connected == 1) {
116 ep->rep_connected = -EIO;
afadc468 117 rpcrdma_conn_func(ep);
c56c65fb
TT
118 wake_up_all(&ep->rep_connect_wait);
119 }
120}
121
2fa8f88d
CL
122/**
123 * rpcrdma_wc_send - Invoked by RDMA provider for each polled Send WC
124 * @cq: completion queue (ignored)
125 * @wc: completed WR
126 *
fc664485
CL
127 */
128static void
2fa8f88d 129rpcrdma_wc_send(struct ib_cq *cq, struct ib_wc *wc)
fc664485 130{
ae72950a
CL
131 struct ib_cqe *cqe = wc->wr_cqe;
132 struct rpcrdma_sendctx *sc =
133 container_of(cqe, struct rpcrdma_sendctx, sc_cqe);
134
2fa8f88d
CL
135 /* WARNING: Only wr_cqe and status are reliable at this point */
136 if (wc->status != IB_WC_SUCCESS && wc->status != IB_WC_WR_FLUSH_ERR)
137 pr_err("rpcrdma: Send: %s (%u/0x%x)\n",
138 ib_wc_status_msg(wc->status),
139 wc->status, wc->vendor_err);
ae72950a
CL
140
141 rpcrdma_sendctx_put_locked(sc);
fc664485 142}
c56c65fb 143
552bf225 144/**
1519e969 145 * rpcrdma_wc_receive - Invoked by RDMA provider for each polled Receive WC
552bf225
CL
146 * @cq: completion queue (ignored)
147 * @wc: completed WR
148 *
149 */
fc664485 150static void
1519e969 151rpcrdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc)
fc664485 152{
552bf225
CL
153 struct ib_cqe *cqe = wc->wr_cqe;
154 struct rpcrdma_rep *rep = container_of(cqe, struct rpcrdma_rep,
155 rr_cqe);
fc664485 156
8502427c
CL
157 /* WARNING: Only wr_id and status are reliable at this point */
158 if (wc->status != IB_WC_SUCCESS)
159 goto out_fail;
fc664485 160
8502427c 161 /* status == SUCCESS means all fields in wc are trustworthy */
8502427c
CL
162 dprintk("RPC: %s: rep %p opcode 'recv', length %u: success\n",
163 __func__, rep, wc->byte_len);
164
96f8778f 165 rpcrdma_set_xdrlen(&rep->rr_hdrbuf, wc->byte_len);
c8b920bb
CL
166 rep->rr_wc_flags = wc->wc_flags;
167 rep->rr_inv_rkey = wc->ex.invalidate_rkey;
168
91a10c52 169 ib_dma_sync_single_for_cpu(rdmab_device(rep->rr_rdmabuf),
6b1184cd 170 rdmab_addr(rep->rr_rdmabuf),
e2a67190 171 wc->byte_len, DMA_FROM_DEVICE);
23826c7a 172
fc664485 173out_schedule:
d8f532d2 174 rpcrdma_reply_handler(rep);
8502427c 175 return;
fe97b47c 176
8502427c
CL
177out_fail:
178 if (wc->status != IB_WC_WR_FLUSH_ERR)
552bf225
CL
179 pr_err("rpcrdma: Recv: %s (%u/0x%x)\n",
180 ib_wc_status_msg(wc->status),
181 wc->status, wc->vendor_err);
e2a67190 182 rpcrdma_set_xdrlen(&rep->rr_hdrbuf, 0);
8502427c 183 goto out_schedule;
fc664485
CL
184}
185
87cfb9a0
CL
186static void
187rpcrdma_update_connect_private(struct rpcrdma_xprt *r_xprt,
188 struct rdma_conn_param *param)
189{
190 struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data;
191 const struct rpcrdma_connect_private *pmsg = param->private_data;
192 unsigned int rsize, wsize;
193
c8b920bb 194 /* Default settings for RPC-over-RDMA Version One */
b5f0afbe 195 r_xprt->rx_ia.ri_implicit_roundup = xprt_rdma_pad_optimize;
87cfb9a0
CL
196 rsize = RPCRDMA_V1_DEF_INLINE_SIZE;
197 wsize = RPCRDMA_V1_DEF_INLINE_SIZE;
198
199 if (pmsg &&
200 pmsg->cp_magic == rpcrdma_cmp_magic &&
201 pmsg->cp_version == RPCRDMA_CMP_VERSION) {
c95a3c6b 202 r_xprt->rx_ia.ri_implicit_roundup = true;
87cfb9a0
CL
203 rsize = rpcrdma_decode_buffer_size(pmsg->cp_send_size);
204 wsize = rpcrdma_decode_buffer_size(pmsg->cp_recv_size);
205 }
206
207 if (rsize < cdata->inline_rsize)
208 cdata->inline_rsize = rsize;
209 if (wsize < cdata->inline_wsize)
210 cdata->inline_wsize = wsize;
6d6bf72d
CL
211 dprintk("RPC: %s: max send %u, max recv %u\n",
212 __func__, cdata->inline_wsize, cdata->inline_rsize);
87cfb9a0
CL
213 rpcrdma_set_max_header_sizes(r_xprt);
214}
215
c56c65fb
TT
216static int
217rpcrdma_conn_upcall(struct rdma_cm_id *id, struct rdma_cm_event *event)
218{
219 struct rpcrdma_xprt *xprt = id->context;
220 struct rpcrdma_ia *ia = &xprt->rx_ia;
221 struct rpcrdma_ep *ep = &xprt->rx_ep;
c56c65fb
TT
222 int connstate = 0;
223
224 switch (event->event) {
225 case RDMA_CM_EVENT_ADDR_RESOLVED:
226 case RDMA_CM_EVENT_ROUTE_RESOLVED:
5675add3 227 ia->ri_async_rc = 0;
c56c65fb
TT
228 complete(&ia->ri_done);
229 break;
230 case RDMA_CM_EVENT_ADDR_ERROR:
231 ia->ri_async_rc = -EHOSTUNREACH;
232 dprintk("RPC: %s: CM address resolution error, ep 0x%p\n",
233 __func__, ep);
234 complete(&ia->ri_done);
235 break;
236 case RDMA_CM_EVENT_ROUTE_ERROR:
237 ia->ri_async_rc = -ENETUNREACH;
238 dprintk("RPC: %s: CM route resolution error, ep 0x%p\n",
239 __func__, ep);
240 complete(&ia->ri_done);
241 break;
bebd0318
CL
242 case RDMA_CM_EVENT_DEVICE_REMOVAL:
243#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
d461f1f2 244 pr_info("rpcrdma: removing device %s for %s:%s\n",
173b8f49 245 ia->ri_device->name,
d461f1f2 246 rpcrdma_addrstr(xprt), rpcrdma_portstr(xprt));
bebd0318
CL
247#endif
248 set_bit(RPCRDMA_IAF_REMOVING, &ia->ri_flags);
249 ep->rep_connected = -ENODEV;
250 xprt_force_disconnect(&xprt->rx_xprt);
251 wait_for_completion(&ia->ri_remove_done);
252
253 ia->ri_id = NULL;
254 ia->ri_pd = NULL;
255 ia->ri_device = NULL;
256 /* Return 1 to ensure the core destroys the id. */
257 return 1;
c56c65fb
TT
258 case RDMA_CM_EVENT_ESTABLISHED:
259 connstate = 1;
87cfb9a0 260 rpcrdma_update_connect_private(xprt, &event->param.conn);
c56c65fb
TT
261 goto connected;
262 case RDMA_CM_EVENT_CONNECT_ERROR:
263 connstate = -ENOTCONN;
264 goto connected;
265 case RDMA_CM_EVENT_UNREACHABLE:
266 connstate = -ENETDOWN;
267 goto connected;
268 case RDMA_CM_EVENT_REJECTED:
d461f1f2
CL
269 dprintk("rpcrdma: connection to %s:%s rejected: %s\n",
270 rpcrdma_addrstr(xprt), rpcrdma_portstr(xprt),
0a90487b 271 rdma_reject_msg(id, event->status));
c56c65fb 272 connstate = -ECONNREFUSED;
0a90487b
CL
273 if (event->status == IB_CM_REJ_STALE_CONN)
274 connstate = -EAGAIN;
c56c65fb
TT
275 goto connected;
276 case RDMA_CM_EVENT_DISCONNECTED:
277 connstate = -ECONNABORTED;
c56c65fb 278connected:
be798f90 279 xprt->rx_buf.rb_credits = 1;
c56c65fb 280 ep->rep_connected = connstate;
afadc468 281 rpcrdma_conn_func(ep);
c56c65fb 282 wake_up_all(&ep->rep_connect_wait);
8079fb78 283 /*FALLTHROUGH*/
c56c65fb 284 default:
d461f1f2
CL
285 dprintk("RPC: %s: %s:%s on %s/%s (ep 0x%p): %s\n",
286 __func__,
287 rpcrdma_addrstr(xprt), rpcrdma_portstr(xprt),
173b8f49
CL
288 ia->ri_device->name, ia->ri_ops->ro_displayname,
289 ep, rdma_event_msg(event->event));
c56c65fb
TT
290 break;
291 }
292
293 return 0;
294}
295
296static struct rdma_cm_id *
dd229cee 297rpcrdma_create_id(struct rpcrdma_xprt *xprt, struct rpcrdma_ia *ia)
c56c65fb 298{
109b88ab 299 unsigned long wtimeout = msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1;
c56c65fb
TT
300 struct rdma_cm_id *id;
301 int rc;
302
1a954051 303 init_completion(&ia->ri_done);
bebd0318 304 init_completion(&ia->ri_remove_done);
1a954051 305
fa20105e
GS
306 id = rdma_create_id(&init_net, rpcrdma_conn_upcall, xprt, RDMA_PS_TCP,
307 IB_QPT_RC);
c56c65fb
TT
308 if (IS_ERR(id)) {
309 rc = PTR_ERR(id);
310 dprintk("RPC: %s: rdma_create_id() failed %i\n",
311 __func__, rc);
312 return id;
313 }
314
5675add3 315 ia->ri_async_rc = -ETIMEDOUT;
dd229cee
CL
316 rc = rdma_resolve_addr(id, NULL,
317 (struct sockaddr *)&xprt->rx_xprt.addr,
318 RDMA_RESOLVE_TIMEOUT);
c56c65fb
TT
319 if (rc) {
320 dprintk("RPC: %s: rdma_resolve_addr() failed %i\n",
321 __func__, rc);
322 goto out;
323 }
109b88ab
CL
324 rc = wait_for_completion_interruptible_timeout(&ia->ri_done, wtimeout);
325 if (rc < 0) {
326 dprintk("RPC: %s: wait() exited: %i\n",
327 __func__, rc);
328 goto out;
329 }
d0f36c46 330
c56c65fb
TT
331 rc = ia->ri_async_rc;
332 if (rc)
333 goto out;
334
5675add3 335 ia->ri_async_rc = -ETIMEDOUT;
c56c65fb
TT
336 rc = rdma_resolve_route(id, RDMA_RESOLVE_TIMEOUT);
337 if (rc) {
338 dprintk("RPC: %s: rdma_resolve_route() failed %i\n",
339 __func__, rc);
56a6bd15 340 goto out;
c56c65fb 341 }
109b88ab
CL
342 rc = wait_for_completion_interruptible_timeout(&ia->ri_done, wtimeout);
343 if (rc < 0) {
344 dprintk("RPC: %s: wait() exited: %i\n",
345 __func__, rc);
56a6bd15 346 goto out;
109b88ab 347 }
c56c65fb
TT
348 rc = ia->ri_async_rc;
349 if (rc)
56a6bd15 350 goto out;
c56c65fb
TT
351
352 return id;
56a6bd15 353
c56c65fb
TT
354out:
355 rdma_destroy_id(id);
356 return ERR_PTR(rc);
357}
358
c56c65fb
TT
359/*
360 * Exported functions.
361 */
362
fff09594
CL
363/**
364 * rpcrdma_ia_open - Open and initialize an Interface Adapter.
dd229cee 365 * @xprt: transport with IA to (re)initialize
fff09594
CL
366 *
367 * Returns 0 on success, negative errno if an appropriate
368 * Interface Adapter could not be found and opened.
c56c65fb
TT
369 */
370int
dd229cee 371rpcrdma_ia_open(struct rpcrdma_xprt *xprt)
c56c65fb 372{
c56c65fb 373 struct rpcrdma_ia *ia = &xprt->rx_ia;
d1ed857e
CL
374 int rc;
375
dd229cee 376 ia->ri_id = rpcrdma_create_id(xprt, ia);
c56c65fb
TT
377 if (IS_ERR(ia->ri_id)) {
378 rc = PTR_ERR(ia->ri_id);
fff09594 379 goto out_err;
c56c65fb 380 }
89e0d112 381 ia->ri_device = ia->ri_id->device;
c56c65fb 382
ed082d36 383 ia->ri_pd = ib_alloc_pd(ia->ri_device, 0);
c56c65fb
TT
384 if (IS_ERR(ia->ri_pd)) {
385 rc = PTR_ERR(ia->ri_pd);
b54054ca 386 pr_err("rpcrdma: ib_alloc_pd() returned %d\n", rc);
fff09594 387 goto out_err;
c56c65fb
TT
388 }
389
fff09594 390 switch (xprt_rdma_memreg_strategy) {
ce5b3717 391 case RPCRDMA_FRWR:
b54054ca
CL
392 if (frwr_is_supported(ia)) {
393 ia->ri_ops = &rpcrdma_frwr_memreg_ops;
394 break;
395 }
396 /*FALLTHROUGH*/
bd7ed1d1 397 case RPCRDMA_MTHCAFMR:
b54054ca
CL
398 if (fmr_is_supported(ia)) {
399 ia->ri_ops = &rpcrdma_fmr_memreg_ops;
400 break;
401 }
402 /*FALLTHROUGH*/
bd7ed1d1 403 default:
fff09594
CL
404 pr_err("rpcrdma: Device %s does not support memreg mode %d\n",
405 ia->ri_device->name, xprt_rdma_memreg_strategy);
b54054ca 406 rc = -EINVAL;
fff09594 407 goto out_err;
c56c65fb
TT
408 }
409
c56c65fb 410 return 0;
5ae711a2 411
fff09594
CL
412out_err:
413 rpcrdma_ia_close(ia);
c56c65fb
TT
414 return rc;
415}
416
bebd0318
CL
417/**
418 * rpcrdma_ia_remove - Handle device driver unload
419 * @ia: interface adapter being removed
420 *
421 * Divest transport H/W resources associated with this adapter,
422 * but allow it to be restored later.
423 */
424void
425rpcrdma_ia_remove(struct rpcrdma_ia *ia)
426{
427 struct rpcrdma_xprt *r_xprt = container_of(ia, struct rpcrdma_xprt,
428 rx_ia);
429 struct rpcrdma_ep *ep = &r_xprt->rx_ep;
430 struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
431 struct rpcrdma_req *req;
432 struct rpcrdma_rep *rep;
433
434 cancel_delayed_work_sync(&buf->rb_refresh_worker);
435
436 /* This is similar to rpcrdma_ep_destroy, but:
437 * - Don't cancel the connect worker.
438 * - Don't call rpcrdma_ep_disconnect, which waits
439 * for another conn upcall, which will deadlock.
440 * - rdma_disconnect is unneeded, the underlying
441 * connection is already gone.
442 */
443 if (ia->ri_id->qp) {
444 ib_drain_qp(ia->ri_id->qp);
445 rdma_destroy_qp(ia->ri_id);
446 ia->ri_id->qp = NULL;
447 }
448 ib_free_cq(ep->rep_attr.recv_cq);
449 ib_free_cq(ep->rep_attr.send_cq);
450
451 /* The ULP is responsible for ensuring all DMA
452 * mappings and MRs are gone.
453 */
454 list_for_each_entry(rep, &buf->rb_recv_bufs, rr_list)
455 rpcrdma_dma_unmap_regbuf(rep->rr_rdmabuf);
456 list_for_each_entry(req, &buf->rb_allreqs, rl_all) {
457 rpcrdma_dma_unmap_regbuf(req->rl_rdmabuf);
458 rpcrdma_dma_unmap_regbuf(req->rl_sendbuf);
459 rpcrdma_dma_unmap_regbuf(req->rl_recvbuf);
460 }
96ceddea 461 rpcrdma_mrs_destroy(buf);
bebd0318
CL
462
463 /* Allow waiters to continue */
464 complete(&ia->ri_remove_done);
465}
466
fff09594
CL
467/**
468 * rpcrdma_ia_close - Clean up/close an IA.
469 * @ia: interface adapter to close
470 *
c56c65fb
TT
471 */
472void
473rpcrdma_ia_close(struct rpcrdma_ia *ia)
474{
c56c65fb 475 dprintk("RPC: %s: entering\n", __func__);
fee08caf
TT
476 if (ia->ri_id != NULL && !IS_ERR(ia->ri_id)) {
477 if (ia->ri_id->qp)
478 rdma_destroy_qp(ia->ri_id);
56a6bd15 479 rdma_destroy_id(ia->ri_id);
fee08caf 480 }
fff09594
CL
481 ia->ri_id = NULL;
482 ia->ri_device = NULL;
6d44698d
CL
483
484 /* If the pd is still busy, xprtrdma missed freeing a resource */
485 if (ia->ri_pd && !IS_ERR(ia->ri_pd))
7dd78647 486 ib_dealloc_pd(ia->ri_pd);
fff09594 487 ia->ri_pd = NULL;
c56c65fb
TT
488}
489
490/*
491 * Create unconnected endpoint.
492 */
493int
494rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia,
16f906d6 495 struct rpcrdma_create_data_internal *cdata)
c56c65fb 496{
87cfb9a0 497 struct rpcrdma_connect_private *pmsg = &ep->rep_cm_private;
16f906d6 498 unsigned int max_qp_wr, max_sge;
fc664485 499 struct ib_cq *sendcq, *recvcq;
2fa8f88d 500 int rc;
c56c65fb 501
eed50879
CL
502 max_sge = min_t(unsigned int, ia->ri_device->attrs.max_sge,
503 RPCRDMA_MAX_SEND_SGES);
16f906d6
CL
504 if (max_sge < RPCRDMA_MIN_SEND_SGES) {
505 pr_warn("rpcrdma: HCA provides only %d send SGEs\n", max_sge);
b3221d6a
CL
506 return -ENOMEM;
507 }
16f906d6 508 ia->ri_max_send_sges = max_sge - RPCRDMA_MIN_SEND_SGES;
b3221d6a 509
e3e45b1b 510 if (ia->ri_device->attrs.max_qp_wr <= RPCRDMA_BACKWARD_WRS) {
124fa17d
CL
511 dprintk("RPC: %s: insufficient wqe's available\n",
512 __func__);
513 return -ENOMEM;
514 }
550d7502 515 max_qp_wr = ia->ri_device->attrs.max_qp_wr - RPCRDMA_BACKWARD_WRS - 1;
124fa17d 516
c56c65fb 517 /* check provider's send/recv wr limits */
124fa17d
CL
518 if (cdata->max_requests > max_qp_wr)
519 cdata->max_requests = max_qp_wr;
c56c65fb
TT
520
521 ep->rep_attr.event_handler = rpcrdma_qp_async_error_upcall;
522 ep->rep_attr.qp_context = ep;
c56c65fb
TT
523 ep->rep_attr.srq = NULL;
524 ep->rep_attr.cap.max_send_wr = cdata->max_requests;
124fa17d 525 ep->rep_attr.cap.max_send_wr += RPCRDMA_BACKWARD_WRS;
550d7502 526 ep->rep_attr.cap.max_send_wr += 1; /* drain cqe */
3968cb58
CL
527 rc = ia->ri_ops->ro_open(ia, ep, cdata);
528 if (rc)
529 return rc;
c56c65fb 530 ep->rep_attr.cap.max_recv_wr = cdata->max_requests;
124fa17d 531 ep->rep_attr.cap.max_recv_wr += RPCRDMA_BACKWARD_WRS;
550d7502 532 ep->rep_attr.cap.max_recv_wr += 1; /* drain cqe */
16f906d6 533 ep->rep_attr.cap.max_send_sge = max_sge;
c56c65fb
TT
534 ep->rep_attr.cap.max_recv_sge = 1;
535 ep->rep_attr.cap.max_inline_data = 0;
536 ep->rep_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
537 ep->rep_attr.qp_type = IB_QPT_RC;
538 ep->rep_attr.port_num = ~0;
539
540 dprintk("RPC: %s: requested max: dtos: send %d recv %d; "
541 "iovs: send %d recv %d\n",
542 __func__,
543 ep->rep_attr.cap.max_send_wr,
544 ep->rep_attr.cap.max_recv_wr,
545 ep->rep_attr.cap.max_send_sge,
546 ep->rep_attr.cap.max_recv_sge);
547
548 /* set trigger for requesting send completion */
ae72950a
CL
549 ep->rep_send_batch = min_t(unsigned int, RPCRDMA_MAX_SEND_BATCH,
550 cdata->max_requests >> 2);
551 ep->rep_send_count = ep->rep_send_batch;
c56c65fb 552 init_waitqueue_head(&ep->rep_connect_wait);
254f91e2 553 INIT_DELAYED_WORK(&ep->rep_connect_worker, rpcrdma_connect_worker);
c56c65fb 554
2fa8f88d
CL
555 sendcq = ib_alloc_cq(ia->ri_device, NULL,
556 ep->rep_attr.cap.max_send_wr + 1,
a4699f56 557 1, IB_POLL_WORKQUEUE);
fc664485
CL
558 if (IS_ERR(sendcq)) {
559 rc = PTR_ERR(sendcq);
560 dprintk("RPC: %s: failed to create send CQ: %i\n",
c56c65fb
TT
561 __func__, rc);
562 goto out1;
563 }
564
552bf225
CL
565 recvcq = ib_alloc_cq(ia->ri_device, NULL,
566 ep->rep_attr.cap.max_recv_wr + 1,
d8f532d2 567 0, IB_POLL_WORKQUEUE);
fc664485
CL
568 if (IS_ERR(recvcq)) {
569 rc = PTR_ERR(recvcq);
570 dprintk("RPC: %s: failed to create recv CQ: %i\n",
571 __func__, rc);
572 goto out2;
573 }
574
fc664485
CL
575 ep->rep_attr.send_cq = sendcq;
576 ep->rep_attr.recv_cq = recvcq;
c56c65fb
TT
577
578 /* Initialize cma parameters */
b2dde94b 579 memset(&ep->rep_remote_cma, 0, sizeof(ep->rep_remote_cma));
c56c65fb 580
87cfb9a0
CL
581 /* Prepare RDMA-CM private message */
582 pmsg->cp_magic = rpcrdma_cmp_magic;
583 pmsg->cp_version = RPCRDMA_CMP_VERSION;
c8b920bb 584 pmsg->cp_flags |= ia->ri_ops->ro_send_w_inv_ok;
87cfb9a0
CL
585 pmsg->cp_send_size = rpcrdma_encode_buffer_size(cdata->inline_wsize);
586 pmsg->cp_recv_size = rpcrdma_encode_buffer_size(cdata->inline_rsize);
587 ep->rep_remote_cma.private_data = pmsg;
588 ep->rep_remote_cma.private_data_len = sizeof(*pmsg);
c56c65fb
TT
589
590 /* Client offers RDMA Read but does not initiate */
b334eaab 591 ep->rep_remote_cma.initiator_depth = 0;
e3e45b1b 592 if (ia->ri_device->attrs.max_qp_rd_atom > 32) /* arbitrary but <= 255 */
b334eaab
TT
593 ep->rep_remote_cma.responder_resources = 32;
594 else
7bc7972c 595 ep->rep_remote_cma.responder_resources =
e3e45b1b 596 ia->ri_device->attrs.max_qp_rd_atom;
c56c65fb 597
b2dde94b
CL
598 /* Limit transport retries so client can detect server
599 * GID changes quickly. RPC layer handles re-establishing
600 * transport connection and retransmission.
601 */
602 ep->rep_remote_cma.retry_count = 6;
603
604 /* RPC-over-RDMA handles its own flow control. In addition,
605 * make all RNR NAKs visible so we know that RPC-over-RDMA
606 * flow control is working correctly (no NAKs should be seen).
607 */
c56c65fb
TT
608 ep->rep_remote_cma.flow_control = 0;
609 ep->rep_remote_cma.rnr_retry_count = 0;
610
611 return 0;
612
613out2:
2fa8f88d 614 ib_free_cq(sendcq);
c56c65fb
TT
615out1:
616 return rc;
617}
618
619/*
620 * rpcrdma_ep_destroy
621 *
622 * Disconnect and destroy endpoint. After this, the only
623 * valid operations on the ep are to free it (if dynamically
624 * allocated) or re-create it.
c56c65fb 625 */
7f1d5419 626void
c56c65fb
TT
627rpcrdma_ep_destroy(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
628{
c56c65fb
TT
629 dprintk("RPC: %s: entering, connected is %d\n",
630 __func__, ep->rep_connected);
631
254f91e2
CL
632 cancel_delayed_work_sync(&ep->rep_connect_worker);
633
72c02173 634 if (ia->ri_id->qp) {
550d7502 635 rpcrdma_ep_disconnect(ep, ia);
fee08caf
TT
636 rdma_destroy_qp(ia->ri_id);
637 ia->ri_id->qp = NULL;
c56c65fb
TT
638 }
639
552bf225 640 ib_free_cq(ep->rep_attr.recv_cq);
2fa8f88d 641 ib_free_cq(ep->rep_attr.send_cq);
c56c65fb
TT
642}
643
a9b0e381
CL
644/* Re-establish a connection after a device removal event.
645 * Unlike a normal reconnection, a fresh PD and a new set
646 * of MRs and buffers is needed.
647 */
648static int
649rpcrdma_ep_recreate_xprt(struct rpcrdma_xprt *r_xprt,
650 struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
651{
a9b0e381
CL
652 int rc, err;
653
654 pr_info("%s: r_xprt = %p\n", __func__, r_xprt);
655
656 rc = -EHOSTUNREACH;
dd229cee 657 if (rpcrdma_ia_open(r_xprt))
a9b0e381
CL
658 goto out1;
659
660 rc = -ENOMEM;
661 err = rpcrdma_ep_create(ep, ia, &r_xprt->rx_data);
662 if (err) {
663 pr_err("rpcrdma: rpcrdma_ep_create returned %d\n", err);
664 goto out2;
665 }
666
667 rc = -ENETUNREACH;
668 err = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr);
669 if (err) {
670 pr_err("rpcrdma: rdma_create_qp returned %d\n", err);
671 goto out3;
672 }
673
96ceddea 674 rpcrdma_mrs_create(r_xprt);
a9b0e381
CL
675 return 0;
676
677out3:
678 rpcrdma_ep_destroy(ep, ia);
679out2:
680 rpcrdma_ia_close(ia);
681out1:
682 return rc;
683}
684
1890896b
CL
685static int
686rpcrdma_ep_reconnect(struct rpcrdma_xprt *r_xprt, struct rpcrdma_ep *ep,
687 struct rpcrdma_ia *ia)
688{
1890896b
CL
689 struct rdma_cm_id *id, *old;
690 int err, rc;
691
692 dprintk("RPC: %s: reconnecting...\n", __func__);
693
694 rpcrdma_ep_disconnect(ep, ia);
695
696 rc = -EHOSTUNREACH;
dd229cee 697 id = rpcrdma_create_id(r_xprt, ia);
1890896b
CL
698 if (IS_ERR(id))
699 goto out;
700
701 /* As long as the new ID points to the same device as the
702 * old ID, we can reuse the transport's existing PD and all
703 * previously allocated MRs. Also, the same device means
704 * the transport's previous DMA mappings are still valid.
705 *
706 * This is a sanity check only. There should be no way these
707 * point to two different devices here.
708 */
709 old = id;
710 rc = -ENETUNREACH;
711 if (ia->ri_device != id->device) {
712 pr_err("rpcrdma: can't reconnect on different device!\n");
713 goto out_destroy;
714 }
715
716 err = rdma_create_qp(id, ia->ri_pd, &ep->rep_attr);
717 if (err) {
718 dprintk("RPC: %s: rdma_create_qp returned %d\n",
719 __func__, err);
720 goto out_destroy;
721 }
722
723 /* Atomically replace the transport's ID and QP. */
724 rc = 0;
725 old = ia->ri_id;
726 ia->ri_id = id;
727 rdma_destroy_qp(old);
728
729out_destroy:
56a6bd15 730 rdma_destroy_id(old);
1890896b
CL
731out:
732 return rc;
733}
734
c56c65fb
TT
735/*
736 * Connect unconnected endpoint.
737 */
738int
739rpcrdma_ep_connect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
740{
0a90487b
CL
741 struct rpcrdma_xprt *r_xprt = container_of(ia, struct rpcrdma_xprt,
742 rx_ia);
0a90487b 743 unsigned int extras;
1890896b 744 int rc;
c56c65fb 745
c56c65fb 746retry:
1890896b
CL
747 switch (ep->rep_connected) {
748 case 0:
ec62f40d
CL
749 dprintk("RPC: %s: connecting...\n", __func__);
750 rc = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr);
751 if (rc) {
752 dprintk("RPC: %s: rdma_create_qp failed %i\n",
753 __func__, rc);
1890896b
CL
754 rc = -ENETUNREACH;
755 goto out_noupdate;
ec62f40d 756 }
1890896b 757 break;
a9b0e381
CL
758 case -ENODEV:
759 rc = rpcrdma_ep_recreate_xprt(r_xprt, ep, ia);
760 if (rc)
761 goto out_noupdate;
762 break;
1890896b
CL
763 default:
764 rc = rpcrdma_ep_reconnect(r_xprt, ep, ia);
765 if (rc)
766 goto out;
c56c65fb
TT
767 }
768
c56c65fb
TT
769 ep->rep_connected = 0;
770
771 rc = rdma_connect(ia->ri_id, &ep->rep_remote_cma);
772 if (rc) {
773 dprintk("RPC: %s: rdma_connect() failed with %i\n",
774 __func__, rc);
775 goto out;
776 }
777
c56c65fb 778 wait_event_interruptible(ep->rep_connect_wait, ep->rep_connected != 0);
c56c65fb 779 if (ep->rep_connected <= 0) {
0a90487b 780 if (ep->rep_connected == -EAGAIN)
c56c65fb
TT
781 goto retry;
782 rc = ep->rep_connected;
0a90487b 783 goto out;
c56c65fb
TT
784 }
785
0a90487b
CL
786 dprintk("RPC: %s: connected\n", __func__);
787 extras = r_xprt->rx_buf.rb_bc_srv_max_requests;
788 if (extras)
789 rpcrdma_ep_post_extra_recv(r_xprt, extras);
790
c56c65fb
TT
791out:
792 if (rc)
793 ep->rep_connected = rc;
1890896b
CL
794
795out_noupdate:
c56c65fb
TT
796 return rc;
797}
798
799/*
800 * rpcrdma_ep_disconnect
801 *
802 * This is separate from destroy to facilitate the ability
803 * to reconnect without recreating the endpoint.
804 *
805 * This call is not reentrant, and must not be made in parallel
806 * on the same endpoint.
807 */
282191cb 808void
c56c65fb
TT
809rpcrdma_ep_disconnect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia)
810{
811 int rc;
812
c56c65fb
TT
813 rc = rdma_disconnect(ia->ri_id);
814 if (!rc) {
815 /* returns without wait if not connected */
816 wait_event_interruptible(ep->rep_connect_wait,
817 ep->rep_connected != 1);
818 dprintk("RPC: %s: after wait, %sconnected\n", __func__,
819 (ep->rep_connected == 1) ? "still " : "dis");
820 } else {
821 dprintk("RPC: %s: rdma_disconnect %i\n", __func__, rc);
822 ep->rep_connected = rc;
823 }
550d7502
CL
824
825 ib_drain_qp(ia->ri_id->qp);
c56c65fb
TT
826}
827
ae72950a
CL
828/* Fixed-size circular FIFO queue. This implementation is wait-free and
829 * lock-free.
830 *
831 * Consumer is the code path that posts Sends. This path dequeues a
832 * sendctx for use by a Send operation. Multiple consumer threads
833 * are serialized by the RPC transport lock, which allows only one
834 * ->send_request call at a time.
835 *
836 * Producer is the code path that handles Send completions. This path
837 * enqueues a sendctx that has been completed. Multiple producer
838 * threads are serialized by the ib_poll_cq() function.
839 */
840
841/* rpcrdma_sendctxs_destroy() assumes caller has already quiesced
842 * queue activity, and ib_drain_qp has flushed all remaining Send
843 * requests.
844 */
845static void rpcrdma_sendctxs_destroy(struct rpcrdma_buffer *buf)
846{
847 unsigned long i;
848
849 for (i = 0; i <= buf->rb_sc_last; i++)
850 kfree(buf->rb_sc_ctxs[i]);
851 kfree(buf->rb_sc_ctxs);
852}
853
854static struct rpcrdma_sendctx *rpcrdma_sendctx_create(struct rpcrdma_ia *ia)
855{
856 struct rpcrdma_sendctx *sc;
857
858 sc = kzalloc(sizeof(*sc) +
859 ia->ri_max_send_sges * sizeof(struct ib_sge),
860 GFP_KERNEL);
861 if (!sc)
862 return NULL;
863
864 sc->sc_wr.wr_cqe = &sc->sc_cqe;
865 sc->sc_wr.sg_list = sc->sc_sges;
866 sc->sc_wr.opcode = IB_WR_SEND;
867 sc->sc_cqe.done = rpcrdma_wc_send;
868 return sc;
869}
870
871static int rpcrdma_sendctxs_create(struct rpcrdma_xprt *r_xprt)
872{
873 struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
874 struct rpcrdma_sendctx *sc;
875 unsigned long i;
876
877 /* Maximum number of concurrent outstanding Send WRs. Capping
878 * the circular queue size stops Send Queue overflow by causing
879 * the ->send_request call to fail temporarily before too many
880 * Sends are posted.
881 */
882 i = buf->rb_max_requests + RPCRDMA_MAX_BC_REQUESTS;
883 dprintk("RPC: %s: allocating %lu send_ctxs\n", __func__, i);
884 buf->rb_sc_ctxs = kcalloc(i, sizeof(sc), GFP_KERNEL);
885 if (!buf->rb_sc_ctxs)
886 return -ENOMEM;
887
888 buf->rb_sc_last = i - 1;
889 for (i = 0; i <= buf->rb_sc_last; i++) {
890 sc = rpcrdma_sendctx_create(&r_xprt->rx_ia);
891 if (!sc)
892 goto out_destroy;
893
894 sc->sc_xprt = r_xprt;
895 buf->rb_sc_ctxs[i] = sc;
896 }
897
898 return 0;
899
900out_destroy:
901 rpcrdma_sendctxs_destroy(buf);
902 return -ENOMEM;
903}
904
905/* The sendctx queue is not guaranteed to have a size that is a
906 * power of two, thus the helpers in circ_buf.h cannot be used.
907 * The other option is to use modulus (%), which can be expensive.
908 */
909static unsigned long rpcrdma_sendctx_next(struct rpcrdma_buffer *buf,
910 unsigned long item)
911{
912 return likely(item < buf->rb_sc_last) ? item + 1 : 0;
913}
914
915/**
916 * rpcrdma_sendctx_get_locked - Acquire a send context
917 * @buf: transport buffers from which to acquire an unused context
918 *
919 * Returns pointer to a free send completion context; or NULL if
920 * the queue is empty.
921 *
922 * Usage: Called to acquire an SGE array before preparing a Send WR.
923 *
924 * The caller serializes calls to this function (per rpcrdma_buffer),
925 * and provides an effective memory barrier that flushes the new value
926 * of rb_sc_head.
927 */
928struct rpcrdma_sendctx *rpcrdma_sendctx_get_locked(struct rpcrdma_buffer *buf)
929{
930 struct rpcrdma_xprt *r_xprt;
931 struct rpcrdma_sendctx *sc;
932 unsigned long next_head;
933
934 next_head = rpcrdma_sendctx_next(buf, buf->rb_sc_head);
935
936 if (next_head == READ_ONCE(buf->rb_sc_tail))
937 goto out_emptyq;
938
939 /* ORDER: item must be accessed _before_ head is updated */
940 sc = buf->rb_sc_ctxs[next_head];
941
942 /* Releasing the lock in the caller acts as a memory
943 * barrier that flushes rb_sc_head.
944 */
945 buf->rb_sc_head = next_head;
946
947 return sc;
948
949out_emptyq:
950 /* The queue is "empty" if there have not been enough Send
951 * completions recently. This is a sign the Send Queue is
952 * backing up. Cause the caller to pause and try again.
953 */
954 dprintk("RPC: %s: empty sendctx queue\n", __func__);
955 r_xprt = container_of(buf, struct rpcrdma_xprt, rx_buf);
956 r_xprt->rx_stats.empty_sendctx_q++;
957 return NULL;
958}
959
960/**
961 * rpcrdma_sendctx_put_locked - Release a send context
962 * @sc: send context to release
963 *
964 * Usage: Called from Send completion to return a sendctxt
965 * to the queue.
966 *
967 * The caller serializes calls to this function (per rpcrdma_buffer).
968 */
969void rpcrdma_sendctx_put_locked(struct rpcrdma_sendctx *sc)
970{
971 struct rpcrdma_buffer *buf = &sc->sc_xprt->rx_buf;
972 unsigned long next_tail;
973
974 /* Unmap SGEs of previously completed by unsignaled
975 * Sends by walking up the queue until @sc is found.
976 */
977 next_tail = buf->rb_sc_tail;
978 do {
979 next_tail = rpcrdma_sendctx_next(buf, next_tail);
980
981 /* ORDER: item must be accessed _before_ tail is updated */
982 rpcrdma_unmap_sendctx(buf->rb_sc_ctxs[next_tail]);
983
984 } while (buf->rb_sc_ctxs[next_tail] != sc);
985
986 /* Paired with READ_ONCE */
987 smp_store_release(&buf->rb_sc_tail, next_tail);
988}
989
505bbe64
CL
990static void
991rpcrdma_mr_recovery_worker(struct work_struct *work)
992{
993 struct rpcrdma_buffer *buf = container_of(work, struct rpcrdma_buffer,
994 rb_recovery_worker.work);
96ceddea 995 struct rpcrdma_mr *mr;
505bbe64
CL
996
997 spin_lock(&buf->rb_recovery_lock);
998 while (!list_empty(&buf->rb_stale_mrs)) {
96ceddea 999 mr = rpcrdma_mr_pop(&buf->rb_stale_mrs);
505bbe64
CL
1000 spin_unlock(&buf->rb_recovery_lock);
1001
96ceddea
CL
1002 dprintk("RPC: %s: recovering MR %p\n", __func__, mr);
1003 mr->mr_xprt->rx_ia.ri_ops->ro_recover_mr(mr);
505bbe64
CL
1004
1005 spin_lock(&buf->rb_recovery_lock);
53d78523 1006 }
505bbe64
CL
1007 spin_unlock(&buf->rb_recovery_lock);
1008}
1009
1010void
96ceddea 1011rpcrdma_mr_defer_recovery(struct rpcrdma_mr *mr)
505bbe64 1012{
96ceddea 1013 struct rpcrdma_xprt *r_xprt = mr->mr_xprt;
505bbe64
CL
1014 struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
1015
1016 spin_lock(&buf->rb_recovery_lock);
96ceddea 1017 rpcrdma_mr_push(mr, &buf->rb_stale_mrs);
505bbe64
CL
1018 spin_unlock(&buf->rb_recovery_lock);
1019
1020 schedule_delayed_work(&buf->rb_recovery_worker, 0);
1021}
1022
e2ac236c 1023static void
96ceddea 1024rpcrdma_mrs_create(struct rpcrdma_xprt *r_xprt)
e2ac236c
CL
1025{
1026 struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
1027 struct rpcrdma_ia *ia = &r_xprt->rx_ia;
1028 unsigned int count;
1029 LIST_HEAD(free);
1030 LIST_HEAD(all);
1031
1032 for (count = 0; count < 32; count++) {
96ceddea 1033 struct rpcrdma_mr *mr;
e2ac236c
CL
1034 int rc;
1035
96ceddea
CL
1036 mr = kzalloc(sizeof(*mr), GFP_KERNEL);
1037 if (!mr)
e2ac236c
CL
1038 break;
1039
96ceddea 1040 rc = ia->ri_ops->ro_init_mr(ia, mr);
e2ac236c 1041 if (rc) {
96ceddea 1042 kfree(mr);
e2ac236c
CL
1043 break;
1044 }
1045
96ceddea 1046 mr->mr_xprt = r_xprt;
e2ac236c 1047
96ceddea
CL
1048 list_add(&mr->mr_list, &free);
1049 list_add(&mr->mr_all, &all);
e2ac236c
CL
1050 }
1051
96ceddea
CL
1052 spin_lock(&buf->rb_mrlock);
1053 list_splice(&free, &buf->rb_mrs);
e2ac236c
CL
1054 list_splice(&all, &buf->rb_all);
1055 r_xprt->rx_stats.mrs_allocated += count;
96ceddea 1056 spin_unlock(&buf->rb_mrlock);
e2ac236c
CL
1057
1058 dprintk("RPC: %s: created %u MRs\n", __func__, count);
1059}
1060
1061static void
1062rpcrdma_mr_refresh_worker(struct work_struct *work)
1063{
1064 struct rpcrdma_buffer *buf = container_of(work, struct rpcrdma_buffer,
1065 rb_refresh_worker.work);
1066 struct rpcrdma_xprt *r_xprt = container_of(buf, struct rpcrdma_xprt,
1067 rx_buf);
1068
96ceddea 1069 rpcrdma_mrs_create(r_xprt);
e2ac236c
CL
1070}
1071
f531a5db 1072struct rpcrdma_req *
1392402c
CL
1073rpcrdma_create_req(struct rpcrdma_xprt *r_xprt)
1074{
f531a5db 1075 struct rpcrdma_buffer *buffer = &r_xprt->rx_buf;
1392402c 1076 struct rpcrdma_req *req;
1392402c 1077
85275c87 1078 req = kzalloc(sizeof(*req), GFP_KERNEL);
1392402c 1079 if (req == NULL)
85275c87 1080 return ERR_PTR(-ENOMEM);
1392402c 1081
f531a5db
CL
1082 spin_lock(&buffer->rb_reqslock);
1083 list_add(&req->rl_all, &buffer->rb_allreqs);
1084 spin_unlock(&buffer->rb_reqslock);
1392402c 1085 req->rl_buffer = &r_xprt->rx_buf;
9d6b0409 1086 INIT_LIST_HEAD(&req->rl_registered);
1392402c 1087 return req;
1392402c
CL
1088}
1089
d698c4a0
CL
1090/**
1091 * rpcrdma_create_rep - Allocate an rpcrdma_rep object
1092 * @r_xprt: controlling transport
1093 *
1094 * Returns 0 on success or a negative errno on failure.
1095 */
1096int
1392402c
CL
1097rpcrdma_create_rep(struct rpcrdma_xprt *r_xprt)
1098{
1099 struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data;
d698c4a0 1100 struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
1392402c
CL
1101 struct rpcrdma_rep *rep;
1102 int rc;
1103
1104 rc = -ENOMEM;
6b1184cd 1105 rep = kzalloc(sizeof(*rep), GFP_KERNEL);
1392402c
CL
1106 if (rep == NULL)
1107 goto out;
1392402c 1108
13650c23 1109 rep->rr_rdmabuf = rpcrdma_alloc_regbuf(cdata->inline_rsize,
99ef4db3 1110 DMA_FROM_DEVICE, GFP_KERNEL);
6b1184cd
CL
1111 if (IS_ERR(rep->rr_rdmabuf)) {
1112 rc = PTR_ERR(rep->rr_rdmabuf);
1392402c 1113 goto out_free;
6b1184cd 1114 }
96f8778f
CL
1115 xdr_buf_init(&rep->rr_hdrbuf, rep->rr_rdmabuf->rg_base,
1116 rdmab_length(rep->rr_rdmabuf));
1392402c 1117
1519e969 1118 rep->rr_cqe.done = rpcrdma_wc_receive;
fed171b3 1119 rep->rr_rxprt = r_xprt;
d8f532d2 1120 INIT_WORK(&rep->rr_work, rpcrdma_deferred_completion);
6ea8e711
CL
1121 rep->rr_recv_wr.next = NULL;
1122 rep->rr_recv_wr.wr_cqe = &rep->rr_cqe;
1123 rep->rr_recv_wr.sg_list = &rep->rr_rdmabuf->rg_iov;
1124 rep->rr_recv_wr.num_sge = 1;
d698c4a0
CL
1125
1126 spin_lock(&buf->rb_lock);
1127 list_add(&rep->rr_list, &buf->rb_recv_bufs);
1128 spin_unlock(&buf->rb_lock);
1129 return 0;
1392402c
CL
1130
1131out_free:
1132 kfree(rep);
1133out:
d698c4a0
CL
1134 dprintk("RPC: %s: reply buffer %d alloc failed\n",
1135 __func__, rc);
1136 return rc;
1392402c
CL
1137}
1138
c56c65fb 1139int
ac920d04 1140rpcrdma_buffer_create(struct rpcrdma_xprt *r_xprt)
c56c65fb 1141{
ac920d04 1142 struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
c56c65fb
TT
1143 int i, rc;
1144
1e465fd4 1145 buf->rb_max_requests = r_xprt->rx_data.max_requests;
f531a5db 1146 buf->rb_bc_srv_max_requests = 0;
96ceddea 1147 spin_lock_init(&buf->rb_mrlock);
505bbe64
CL
1148 spin_lock_init(&buf->rb_lock);
1149 spin_lock_init(&buf->rb_recovery_lock);
96ceddea 1150 INIT_LIST_HEAD(&buf->rb_mrs);
e2ac236c 1151 INIT_LIST_HEAD(&buf->rb_all);
505bbe64 1152 INIT_LIST_HEAD(&buf->rb_stale_mrs);
e2ac236c
CL
1153 INIT_DELAYED_WORK(&buf->rb_refresh_worker,
1154 rpcrdma_mr_refresh_worker);
505bbe64
CL
1155 INIT_DELAYED_WORK(&buf->rb_recovery_worker,
1156 rpcrdma_mr_recovery_worker);
c56c65fb 1157
96ceddea 1158 rpcrdma_mrs_create(r_xprt);
c56c65fb 1159
1e465fd4 1160 INIT_LIST_HEAD(&buf->rb_send_bufs);
f531a5db
CL
1161 INIT_LIST_HEAD(&buf->rb_allreqs);
1162 spin_lock_init(&buf->rb_reqslock);
c56c65fb
TT
1163 for (i = 0; i < buf->rb_max_requests; i++) {
1164 struct rpcrdma_req *req;
c56c65fb 1165
1392402c
CL
1166 req = rpcrdma_create_req(r_xprt);
1167 if (IS_ERR(req)) {
c56c65fb
TT
1168 dprintk("RPC: %s: request buffer %d alloc"
1169 " failed\n", __func__, i);
1392402c 1170 rc = PTR_ERR(req);
c56c65fb
TT
1171 goto out;
1172 }
a80d66c9 1173 list_add(&req->rl_list, &buf->rb_send_bufs);
1e465fd4
CL
1174 }
1175
1176 INIT_LIST_HEAD(&buf->rb_recv_bufs);
d698c4a0
CL
1177 for (i = 0; i <= buf->rb_max_requests; i++) {
1178 rc = rpcrdma_create_rep(r_xprt);
1179 if (rc)
c56c65fb 1180 goto out;
c56c65fb 1181 }
1392402c 1182
ae72950a
CL
1183 rc = rpcrdma_sendctxs_create(r_xprt);
1184 if (rc)
1185 goto out;
1186
c56c65fb
TT
1187 return 0;
1188out:
1189 rpcrdma_buffer_destroy(buf);
1190 return rc;
1191}
1192
1e465fd4
CL
1193static struct rpcrdma_req *
1194rpcrdma_buffer_get_req_locked(struct rpcrdma_buffer *buf)
1195{
1196 struct rpcrdma_req *req;
1197
1198 req = list_first_entry(&buf->rb_send_bufs,
a80d66c9 1199 struct rpcrdma_req, rl_list);
431af645 1200 list_del_init(&req->rl_list);
1e465fd4
CL
1201 return req;
1202}
1203
1204static struct rpcrdma_rep *
1205rpcrdma_buffer_get_rep_locked(struct rpcrdma_buffer *buf)
1206{
1207 struct rpcrdma_rep *rep;
1208
1209 rep = list_first_entry(&buf->rb_recv_bufs,
1210 struct rpcrdma_rep, rr_list);
1211 list_del(&rep->rr_list);
1212 return rep;
1213}
1214
1392402c 1215static void
13650c23 1216rpcrdma_destroy_rep(struct rpcrdma_rep *rep)
1392402c 1217{
13650c23 1218 rpcrdma_free_regbuf(rep->rr_rdmabuf);
1392402c
CL
1219 kfree(rep);
1220}
1221
f531a5db 1222void
13650c23 1223rpcrdma_destroy_req(struct rpcrdma_req *req)
1392402c 1224{
13650c23
CL
1225 rpcrdma_free_regbuf(req->rl_recvbuf);
1226 rpcrdma_free_regbuf(req->rl_sendbuf);
1227 rpcrdma_free_regbuf(req->rl_rdmabuf);
1392402c
CL
1228 kfree(req);
1229}
1230
e2ac236c 1231static void
96ceddea 1232rpcrdma_mrs_destroy(struct rpcrdma_buffer *buf)
e2ac236c
CL
1233{
1234 struct rpcrdma_xprt *r_xprt = container_of(buf, struct rpcrdma_xprt,
1235 rx_buf);
1236 struct rpcrdma_ia *ia = rdmab_to_ia(buf);
96ceddea 1237 struct rpcrdma_mr *mr;
e2ac236c
CL
1238 unsigned int count;
1239
1240 count = 0;
96ceddea 1241 spin_lock(&buf->rb_mrlock);
e2ac236c 1242 while (!list_empty(&buf->rb_all)) {
96ceddea
CL
1243 mr = list_entry(buf->rb_all.next, struct rpcrdma_mr, mr_all);
1244 list_del(&mr->mr_all);
e2ac236c 1245
96ceddea
CL
1246 spin_unlock(&buf->rb_mrlock);
1247 ia->ri_ops->ro_release_mr(mr);
e2ac236c 1248 count++;
96ceddea 1249 spin_lock(&buf->rb_mrlock);
e2ac236c 1250 }
96ceddea 1251 spin_unlock(&buf->rb_mrlock);
e2ac236c
CL
1252 r_xprt->rx_stats.mrs_allocated = 0;
1253
1254 dprintk("RPC: %s: released %u MRs\n", __func__, count);
1255}
1256
c56c65fb
TT
1257void
1258rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf)
1259{
505bbe64 1260 cancel_delayed_work_sync(&buf->rb_recovery_worker);
9378b274 1261 cancel_delayed_work_sync(&buf->rb_refresh_worker);
505bbe64 1262
ae72950a
CL
1263 rpcrdma_sendctxs_destroy(buf);
1264
1e465fd4
CL
1265 while (!list_empty(&buf->rb_recv_bufs)) {
1266 struct rpcrdma_rep *rep;
c56c65fb 1267
1e465fd4 1268 rep = rpcrdma_buffer_get_rep_locked(buf);
13650c23 1269 rpcrdma_destroy_rep(rep);
c56c65fb 1270 }
05c97466 1271 buf->rb_send_count = 0;
c56c65fb 1272
f531a5db
CL
1273 spin_lock(&buf->rb_reqslock);
1274 while (!list_empty(&buf->rb_allreqs)) {
1e465fd4 1275 struct rpcrdma_req *req;
4034ba04 1276
f531a5db
CL
1277 req = list_first_entry(&buf->rb_allreqs,
1278 struct rpcrdma_req, rl_all);
1279 list_del(&req->rl_all);
1280
1281 spin_unlock(&buf->rb_reqslock);
13650c23 1282 rpcrdma_destroy_req(req);
f531a5db 1283 spin_lock(&buf->rb_reqslock);
1e465fd4 1284 }
f531a5db 1285 spin_unlock(&buf->rb_reqslock);
05c97466 1286 buf->rb_recv_count = 0;
4034ba04 1287
96ceddea 1288 rpcrdma_mrs_destroy(buf);
c56c65fb
TT
1289}
1290
96ceddea
CL
1291/**
1292 * rpcrdma_mr_get - Allocate an rpcrdma_mr object
1293 * @r_xprt: controlling transport
1294 *
1295 * Returns an initialized rpcrdma_mr or NULL if no free
1296 * rpcrdma_mr objects are available.
1297 */
1298struct rpcrdma_mr *
1299rpcrdma_mr_get(struct rpcrdma_xprt *r_xprt)
c2922c02 1300{
346aa66b 1301 struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
96ceddea 1302 struct rpcrdma_mr *mr = NULL;
346aa66b 1303
96ceddea
CL
1304 spin_lock(&buf->rb_mrlock);
1305 if (!list_empty(&buf->rb_mrs))
1306 mr = rpcrdma_mr_pop(&buf->rb_mrs);
1307 spin_unlock(&buf->rb_mrlock);
346aa66b 1308
96ceddea
CL
1309 if (!mr)
1310 goto out_nomrs;
1311 return mr;
e2ac236c 1312
96ceddea
CL
1313out_nomrs:
1314 dprintk("RPC: %s: no MRs available\n", __func__);
bebd0318
CL
1315 if (r_xprt->rx_ep.rep_connected != -ENODEV)
1316 schedule_delayed_work(&buf->rb_refresh_worker, 0);
e2ac236c
CL
1317
1318 /* Allow the reply handler and refresh worker to run */
1319 cond_resched();
1320
1321 return NULL;
c2922c02
CL
1322}
1323
ec12e479
CL
1324static void
1325__rpcrdma_mr_put(struct rpcrdma_buffer *buf, struct rpcrdma_mr *mr)
1326{
1327 spin_lock(&buf->rb_mrlock);
1328 rpcrdma_mr_push(mr, &buf->rb_mrs);
1329 spin_unlock(&buf->rb_mrlock);
1330}
1331
96ceddea
CL
1332/**
1333 * rpcrdma_mr_put - Release an rpcrdma_mr object
1334 * @mr: object to release
1335 *
1336 */
346aa66b 1337void
96ceddea 1338rpcrdma_mr_put(struct rpcrdma_mr *mr)
ec12e479
CL
1339{
1340 __rpcrdma_mr_put(&mr->mr_xprt->rx_buf, mr);
1341}
1342
1343/**
1344 * rpcrdma_mr_unmap_and_put - DMA unmap an MR and release it
1345 * @mr: object to release
1346 *
1347 */
1348void
1349rpcrdma_mr_unmap_and_put(struct rpcrdma_mr *mr)
c2922c02 1350{
96ceddea 1351 struct rpcrdma_xprt *r_xprt = mr->mr_xprt;
c2922c02 1352
ec12e479
CL
1353 ib_dma_unmap_sg(r_xprt->rx_ia.ri_device,
1354 mr->mr_sg, mr->mr_nents, mr->mr_dir);
1355 __rpcrdma_mr_put(&r_xprt->rx_buf, mr);
c2922c02
CL
1356}
1357
05c97466
CL
1358static struct rpcrdma_rep *
1359rpcrdma_buffer_get_rep(struct rpcrdma_buffer *buffers)
1360{
1361 /* If an RPC previously completed without a reply (say, a
1362 * credential problem or a soft timeout occurs) then hold off
1363 * on supplying more Receive buffers until the number of new
1364 * pending RPCs catches up to the number of posted Receives.
1365 */
1366 if (unlikely(buffers->rb_send_count < buffers->rb_recv_count))
1367 return NULL;
1368
1369 if (unlikely(list_empty(&buffers->rb_recv_bufs)))
1370 return NULL;
1371 buffers->rb_recv_count++;
1372 return rpcrdma_buffer_get_rep_locked(buffers);
1373}
1374
c56c65fb
TT
1375/*
1376 * Get a set of request/reply buffers.
78d506e1
CL
1377 *
1378 * Reply buffer (if available) is attached to send buffer upon return.
c56c65fb
TT
1379 */
1380struct rpcrdma_req *
1381rpcrdma_buffer_get(struct rpcrdma_buffer *buffers)
1382{
1383 struct rpcrdma_req *req;
c14d86e5 1384
a5b027e1 1385 spin_lock(&buffers->rb_lock);
1e465fd4
CL
1386 if (list_empty(&buffers->rb_send_bufs))
1387 goto out_reqbuf;
05c97466 1388 buffers->rb_send_count++;
1e465fd4 1389 req = rpcrdma_buffer_get_req_locked(buffers);
05c97466 1390 req->rl_reply = rpcrdma_buffer_get_rep(buffers);
a5b027e1 1391 spin_unlock(&buffers->rb_lock);
1e465fd4 1392 return req;
ddb6bebc 1393
1e465fd4 1394out_reqbuf:
a5b027e1 1395 spin_unlock(&buffers->rb_lock);
78d506e1 1396 pr_warn("RPC: %s: out of request buffers\n", __func__);
1e465fd4 1397 return NULL;
c56c65fb
TT
1398}
1399
1400/*
1401 * Put request/reply buffers back into pool.
1402 * Pre-decrement counter/array index.
1403 */
1404void
1405rpcrdma_buffer_put(struct rpcrdma_req *req)
1406{
1407 struct rpcrdma_buffer *buffers = req->rl_buffer;
1e465fd4 1408 struct rpcrdma_rep *rep = req->rl_reply;
c56c65fb 1409
1e465fd4
CL
1410 req->rl_reply = NULL;
1411
a5b027e1 1412 spin_lock(&buffers->rb_lock);
05c97466 1413 buffers->rb_send_count--;
a80d66c9 1414 list_add_tail(&req->rl_list, &buffers->rb_send_bufs);
05c97466
CL
1415 if (rep) {
1416 buffers->rb_recv_count--;
1e465fd4 1417 list_add_tail(&rep->rr_list, &buffers->rb_recv_bufs);
05c97466 1418 }
a5b027e1 1419 spin_unlock(&buffers->rb_lock);
c56c65fb
TT
1420}
1421
1422/*
1423 * Recover reply buffers from pool.
1e465fd4 1424 * This happens when recovering from disconnect.
c56c65fb
TT
1425 */
1426void
1427rpcrdma_recv_buffer_get(struct rpcrdma_req *req)
1428{
1429 struct rpcrdma_buffer *buffers = req->rl_buffer;
c56c65fb 1430
a5b027e1 1431 spin_lock(&buffers->rb_lock);
05c97466 1432 req->rl_reply = rpcrdma_buffer_get_rep(buffers);
a5b027e1 1433 spin_unlock(&buffers->rb_lock);
c56c65fb
TT
1434}
1435
1436/*
1437 * Put reply buffers back into pool when not attached to
b45ccfd2 1438 * request. This happens in error conditions.
c56c65fb
TT
1439 */
1440void
1441rpcrdma_recv_buffer_put(struct rpcrdma_rep *rep)
1442{
fed171b3 1443 struct rpcrdma_buffer *buffers = &rep->rr_rxprt->rx_buf;
c56c65fb 1444
a5b027e1 1445 spin_lock(&buffers->rb_lock);
05c97466 1446 buffers->rb_recv_count--;
1e465fd4 1447 list_add_tail(&rep->rr_list, &buffers->rb_recv_bufs);
a5b027e1 1448 spin_unlock(&buffers->rb_lock);
c56c65fb
TT
1449}
1450
9128c3e7 1451/**
99ef4db3 1452 * rpcrdma_alloc_regbuf - allocate and DMA-map memory for SEND/RECV buffers
9128c3e7 1453 * @size: size of buffer to be allocated, in bytes
99ef4db3 1454 * @direction: direction of data movement
9128c3e7
CL
1455 * @flags: GFP flags
1456 *
54cbd6b0
CL
1457 * Returns an ERR_PTR, or a pointer to a regbuf, a buffer that
1458 * can be persistently DMA-mapped for I/O.
9128c3e7
CL
1459 *
1460 * xprtrdma uses a regbuf for posting an outgoing RDMA SEND, or for
99ef4db3
CL
1461 * receiving the payload of RDMA RECV operations. During Long Calls
1462 * or Replies they may be registered externally via ro_map.
9128c3e7
CL
1463 */
1464struct rpcrdma_regbuf *
13650c23
CL
1465rpcrdma_alloc_regbuf(size_t size, enum dma_data_direction direction,
1466 gfp_t flags)
9128c3e7
CL
1467{
1468 struct rpcrdma_regbuf *rb;
9128c3e7 1469
9128c3e7
CL
1470 rb = kmalloc(sizeof(*rb) + size, flags);
1471 if (rb == NULL)
54cbd6b0 1472 return ERR_PTR(-ENOMEM);
9128c3e7 1473
54cbd6b0 1474 rb->rg_device = NULL;
99ef4db3 1475 rb->rg_direction = direction;
54cbd6b0 1476 rb->rg_iov.length = size;
9128c3e7
CL
1477
1478 return rb;
54cbd6b0 1479}
9128c3e7 1480
54cbd6b0
CL
1481/**
1482 * __rpcrdma_map_regbuf - DMA-map a regbuf
1483 * @ia: controlling rpcrdma_ia
1484 * @rb: regbuf to be mapped
1485 */
1486bool
1487__rpcrdma_dma_map_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb)
1488{
91a10c52
CL
1489 struct ib_device *device = ia->ri_device;
1490
54cbd6b0
CL
1491 if (rb->rg_direction == DMA_NONE)
1492 return false;
1493
91a10c52 1494 rb->rg_iov.addr = ib_dma_map_single(device,
54cbd6b0
CL
1495 (void *)rb->rg_base,
1496 rdmab_length(rb),
1497 rb->rg_direction);
91a10c52 1498 if (ib_dma_mapping_error(device, rdmab_addr(rb)))
54cbd6b0
CL
1499 return false;
1500
91a10c52 1501 rb->rg_device = device;
54cbd6b0
CL
1502 rb->rg_iov.lkey = ia->ri_pd->local_dma_lkey;
1503 return true;
1504}
1505
1506static void
1507rpcrdma_dma_unmap_regbuf(struct rpcrdma_regbuf *rb)
1508{
1509 if (!rpcrdma_regbuf_is_mapped(rb))
1510 return;
1511
1512 ib_dma_unmap_single(rb->rg_device, rdmab_addr(rb),
1513 rdmab_length(rb), rb->rg_direction);
1514 rb->rg_device = NULL;
9128c3e7
CL
1515}
1516
1517/**
1518 * rpcrdma_free_regbuf - deregister and free registered buffer
9128c3e7
CL
1519 * @rb: regbuf to be deregistered and freed
1520 */
1521void
13650c23 1522rpcrdma_free_regbuf(struct rpcrdma_regbuf *rb)
9128c3e7 1523{
e531dcab
CL
1524 if (!rb)
1525 return;
1526
54cbd6b0 1527 rpcrdma_dma_unmap_regbuf(rb);
e531dcab 1528 kfree(rb);
9128c3e7
CL
1529}
1530
c56c65fb
TT
1531/*
1532 * Prepost any receive buffer, then post send.
1533 *
1534 * Receive buffer is donated to hardware, reclaimed upon recv completion.
1535 */
1536int
1537rpcrdma_ep_post(struct rpcrdma_ia *ia,
1538 struct rpcrdma_ep *ep,
1539 struct rpcrdma_req *req)
1540{
ae72950a 1541 struct ib_send_wr *send_wr = &req->rl_sendctx->sc_wr;
90aab602 1542 struct ib_send_wr *send_wr_fail;
655fec69 1543 int rc;
c56c65fb 1544
90aab602
CL
1545 if (req->rl_reply) {
1546 rc = rpcrdma_ep_post_recv(ia, req->rl_reply);
c56c65fb 1547 if (rc)
7a89f9c6 1548 return rc;
c56c65fb
TT
1549 req->rl_reply = NULL;
1550 }
1551
b3221d6a 1552 dprintk("RPC: %s: posting %d s/g entries\n",
90aab602 1553 __func__, send_wr->num_sge);
c56c65fb 1554
01bb35c8
CL
1555 if (!ep->rep_send_count ||
1556 test_bit(RPCRDMA_REQ_F_TX_RESOURCES, &req->rl_flags)) {
ae72950a
CL
1557 send_wr->send_flags |= IB_SEND_SIGNALED;
1558 ep->rep_send_count = ep->rep_send_batch;
1559 } else {
1560 send_wr->send_flags &= ~IB_SEND_SIGNALED;
1561 --ep->rep_send_count;
1562 }
90aab602 1563 rc = ib_post_send(ia->ri_id->qp, send_wr, &send_wr_fail);
c56c65fb 1564 if (rc)
7a89f9c6
CL
1565 goto out_postsend_err;
1566 return 0;
1567
1568out_postsend_err:
1569 pr_err("rpcrdma: RDMA Send ib_post_send returned %i\n", rc);
1570 return -ENOTCONN;
c56c65fb
TT
1571}
1572
c56c65fb
TT
1573int
1574rpcrdma_ep_post_recv(struct rpcrdma_ia *ia,
c56c65fb
TT
1575 struct rpcrdma_rep *rep)
1576{
6ea8e711 1577 struct ib_recv_wr *recv_wr_fail;
c56c65fb
TT
1578 int rc;
1579
54cbd6b0
CL
1580 if (!rpcrdma_dma_map_regbuf(ia, rep->rr_rdmabuf))
1581 goto out_map;
6ea8e711 1582 rc = ib_post_recv(ia->ri_id->qp, &rep->rr_recv_wr, &recv_wr_fail);
c56c65fb 1583 if (rc)
7a89f9c6
CL
1584 goto out_postrecv;
1585 return 0;
1586
54cbd6b0
CL
1587out_map:
1588 pr_err("rpcrdma: failed to DMA map the Receive buffer\n");
1589 return -EIO;
1590
7a89f9c6
CL
1591out_postrecv:
1592 pr_err("rpcrdma: ib_post_recv returned %i\n", rc);
1593 return -ENOTCONN;
c56c65fb 1594}
43e95988 1595
f531a5db
CL
1596/**
1597 * rpcrdma_ep_post_extra_recv - Post buffers for incoming backchannel requests
1598 * @r_xprt: transport associated with these backchannel resources
1599 * @min_reqs: minimum number of incoming requests expected
1600 *
1601 * Returns zero if all requested buffers were posted, or a negative errno.
1602 */
1603int
1604rpcrdma_ep_post_extra_recv(struct rpcrdma_xprt *r_xprt, unsigned int count)
1605{
1606 struct rpcrdma_buffer *buffers = &r_xprt->rx_buf;
1607 struct rpcrdma_ia *ia = &r_xprt->rx_ia;
f531a5db 1608 struct rpcrdma_rep *rep;
f531a5db
CL
1609 int rc;
1610
1611 while (count--) {
9b06688b 1612 spin_lock(&buffers->rb_lock);
f531a5db
CL
1613 if (list_empty(&buffers->rb_recv_bufs))
1614 goto out_reqbuf;
1615 rep = rpcrdma_buffer_get_rep_locked(buffers);
9b06688b 1616 spin_unlock(&buffers->rb_lock);
f531a5db 1617
b157380a 1618 rc = rpcrdma_ep_post_recv(ia, rep);
f531a5db
CL
1619 if (rc)
1620 goto out_rc;
1621 }
1622
1623 return 0;
1624
1625out_reqbuf:
9b06688b 1626 spin_unlock(&buffers->rb_lock);
f531a5db
CL
1627 pr_warn("%s: no extra receive buffers\n", __func__);
1628 return -ENOMEM;
1629
1630out_rc:
1631 rpcrdma_recv_buffer_put(rep);
1632 return rc;
1633}