Commit | Line | Data |
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f58851e6 | 1 | /* |
c56c65fb TT |
2 | * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved. |
3 | * | |
4 | * This software is available to you under a choice of one of two | |
5 | * licenses. You may choose to be licensed under the terms of the GNU | |
6 | * General Public License (GPL) Version 2, available from the file | |
7 | * COPYING in the main directory of this source tree, or the BSD-type | |
8 | * license below: | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or without | |
11 | * modification, are permitted provided that the following conditions | |
12 | * are met: | |
13 | * | |
14 | * Redistributions of source code must retain the above copyright | |
15 | * notice, this list of conditions and the following disclaimer. | |
16 | * | |
17 | * Redistributions in binary form must reproduce the above | |
18 | * copyright notice, this list of conditions and the following | |
19 | * disclaimer in the documentation and/or other materials provided | |
20 | * with the distribution. | |
21 | * | |
22 | * Neither the name of the Network Appliance, Inc. nor the names of | |
23 | * its contributors may be used to endorse or promote products | |
24 | * derived from this software without specific prior written | |
25 | * permission. | |
26 | * | |
27 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
28 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
29 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
30 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
31 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
32 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
33 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
34 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
35 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
36 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
37 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
f58851e6 TT |
38 | */ |
39 | ||
c56c65fb TT |
40 | /* |
41 | * verbs.c | |
42 | * | |
43 | * Encapsulates the major functions managing: | |
44 | * o adapters | |
45 | * o endpoints | |
46 | * o connections | |
47 | * o buffer memory | |
48 | */ | |
49 | ||
a6b7a407 | 50 | #include <linux/interrupt.h> |
5a0e3ad6 | 51 | #include <linux/slab.h> |
eba8ff66 | 52 | #include <linux/prefetch.h> |
0dd39cae | 53 | #include <linux/sunrpc/addr.h> |
05c97466 | 54 | #include <linux/sunrpc/svc_rdma.h> |
65866f82 | 55 | #include <asm/bitops.h> |
d0f36c46 | 56 | #include <linux/module.h> /* try_module_get()/module_put() */ |
c56c65fb | 57 | |
f58851e6 TT |
58 | #include "xprt_rdma.h" |
59 | ||
c56c65fb TT |
60 | /* |
61 | * Globals/Macros | |
62 | */ | |
63 | ||
f895b252 | 64 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
c56c65fb TT |
65 | # define RPCDBG_FACILITY RPCDBG_TRANS |
66 | #endif | |
67 | ||
68 | /* | |
69 | * internal functions | |
70 | */ | |
71 | ||
fe97b47c | 72 | static struct workqueue_struct *rpcrdma_receive_wq; |
c56c65fb | 73 | |
fe97b47c CL |
74 | int |
75 | rpcrdma_alloc_wq(void) | |
c56c65fb | 76 | { |
fe97b47c | 77 | struct workqueue_struct *recv_wq; |
c56c65fb | 78 | |
fe97b47c CL |
79 | recv_wq = alloc_workqueue("xprtrdma_receive", |
80 | WQ_MEM_RECLAIM | WQ_UNBOUND | WQ_HIGHPRI, | |
81 | 0); | |
82 | if (!recv_wq) | |
83 | return -ENOMEM; | |
c56c65fb | 84 | |
fe97b47c CL |
85 | rpcrdma_receive_wq = recv_wq; |
86 | return 0; | |
c56c65fb TT |
87 | } |
88 | ||
fe97b47c CL |
89 | void |
90 | rpcrdma_destroy_wq(void) | |
f1a03b76 | 91 | { |
fe97b47c | 92 | struct workqueue_struct *wq; |
f1a03b76 | 93 | |
fe97b47c CL |
94 | if (rpcrdma_receive_wq) { |
95 | wq = rpcrdma_receive_wq; | |
96 | rpcrdma_receive_wq = NULL; | |
97 | destroy_workqueue(wq); | |
98 | } | |
f1a03b76 CL |
99 | } |
100 | ||
c56c65fb TT |
101 | static void |
102 | rpcrdma_qp_async_error_upcall(struct ib_event *event, void *context) | |
103 | { | |
104 | struct rpcrdma_ep *ep = context; | |
105 | ||
7ff11de1 | 106 | pr_err("RPC: %s: %s on device %s ep %p\n", |
76357c71 | 107 | __func__, ib_event_msg(event->event), |
7ff11de1 | 108 | event->device->name, context); |
c56c65fb TT |
109 | if (ep->rep_connected == 1) { |
110 | ep->rep_connected = -EIO; | |
afadc468 | 111 | rpcrdma_conn_func(ep); |
c56c65fb TT |
112 | wake_up_all(&ep->rep_connect_wait); |
113 | } | |
114 | } | |
115 | ||
2fa8f88d CL |
116 | /** |
117 | * rpcrdma_wc_send - Invoked by RDMA provider for each polled Send WC | |
118 | * @cq: completion queue (ignored) | |
119 | * @wc: completed WR | |
120 | * | |
fc664485 CL |
121 | */ |
122 | static void | |
2fa8f88d | 123 | rpcrdma_wc_send(struct ib_cq *cq, struct ib_wc *wc) |
fc664485 | 124 | { |
2fa8f88d CL |
125 | /* WARNING: Only wr_cqe and status are reliable at this point */ |
126 | if (wc->status != IB_WC_SUCCESS && wc->status != IB_WC_WR_FLUSH_ERR) | |
127 | pr_err("rpcrdma: Send: %s (%u/0x%x)\n", | |
128 | ib_wc_status_msg(wc->status), | |
129 | wc->status, wc->vendor_err); | |
fc664485 | 130 | } |
c56c65fb | 131 | |
23826c7a CL |
132 | /* Perform basic sanity checking to avoid using garbage |
133 | * to update the credit grant value. | |
134 | */ | |
135 | static void | |
136 | rpcrdma_update_granted_credits(struct rpcrdma_rep *rep) | |
137 | { | |
138 | struct rpcrdma_msg *rmsgp = rdmab_to_msg(rep->rr_rdmabuf); | |
139 | struct rpcrdma_buffer *buffer = &rep->rr_rxprt->rx_buf; | |
140 | u32 credits; | |
141 | ||
142 | if (rep->rr_len < RPCRDMA_HDRLEN_ERR) | |
143 | return; | |
144 | ||
145 | credits = be32_to_cpu(rmsgp->rm_credit); | |
146 | if (credits == 0) | |
147 | credits = 1; /* don't deadlock */ | |
148 | else if (credits > buffer->rb_max_requests) | |
149 | credits = buffer->rb_max_requests; | |
150 | ||
151 | atomic_set(&buffer->rb_credits, credits); | |
152 | } | |
153 | ||
552bf225 | 154 | /** |
1519e969 | 155 | * rpcrdma_wc_receive - Invoked by RDMA provider for each polled Receive WC |
552bf225 CL |
156 | * @cq: completion queue (ignored) |
157 | * @wc: completed WR | |
158 | * | |
159 | */ | |
fc664485 | 160 | static void |
1519e969 | 161 | rpcrdma_wc_receive(struct ib_cq *cq, struct ib_wc *wc) |
fc664485 | 162 | { |
552bf225 CL |
163 | struct ib_cqe *cqe = wc->wr_cqe; |
164 | struct rpcrdma_rep *rep = container_of(cqe, struct rpcrdma_rep, | |
165 | rr_cqe); | |
fc664485 | 166 | |
8502427c CL |
167 | /* WARNING: Only wr_id and status are reliable at this point */ |
168 | if (wc->status != IB_WC_SUCCESS) | |
169 | goto out_fail; | |
fc664485 | 170 | |
8502427c | 171 | /* status == SUCCESS means all fields in wc are trustworthy */ |
fc664485 CL |
172 | if (wc->opcode != IB_WC_RECV) |
173 | return; | |
174 | ||
8502427c CL |
175 | dprintk("RPC: %s: rep %p opcode 'recv', length %u: success\n", |
176 | __func__, rep, wc->byte_len); | |
177 | ||
fc664485 | 178 | rep->rr_len = wc->byte_len; |
c8b920bb CL |
179 | rep->rr_wc_flags = wc->wc_flags; |
180 | rep->rr_inv_rkey = wc->ex.invalidate_rkey; | |
181 | ||
89e0d112 | 182 | ib_dma_sync_single_for_cpu(rep->rr_device, |
6b1184cd CL |
183 | rdmab_addr(rep->rr_rdmabuf), |
184 | rep->rr_len, DMA_FROM_DEVICE); | |
23826c7a CL |
185 | |
186 | rpcrdma_update_granted_credits(rep); | |
fc664485 CL |
187 | |
188 | out_schedule: | |
fe97b47c | 189 | queue_work(rpcrdma_receive_wq, &rep->rr_work); |
8502427c | 190 | return; |
fe97b47c | 191 | |
8502427c CL |
192 | out_fail: |
193 | if (wc->status != IB_WC_WR_FLUSH_ERR) | |
552bf225 CL |
194 | pr_err("rpcrdma: Recv: %s (%u/0x%x)\n", |
195 | ib_wc_status_msg(wc->status), | |
196 | wc->status, wc->vendor_err); | |
b0e178a2 | 197 | rep->rr_len = RPCRDMA_BAD_LEN; |
8502427c | 198 | goto out_schedule; |
fc664485 CL |
199 | } |
200 | ||
87cfb9a0 CL |
201 | static void |
202 | rpcrdma_update_connect_private(struct rpcrdma_xprt *r_xprt, | |
203 | struct rdma_conn_param *param) | |
204 | { | |
205 | struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data; | |
206 | const struct rpcrdma_connect_private *pmsg = param->private_data; | |
207 | unsigned int rsize, wsize; | |
208 | ||
c8b920bb CL |
209 | /* Default settings for RPC-over-RDMA Version One */ |
210 | r_xprt->rx_ia.ri_reminv_expected = false; | |
87cfb9a0 CL |
211 | rsize = RPCRDMA_V1_DEF_INLINE_SIZE; |
212 | wsize = RPCRDMA_V1_DEF_INLINE_SIZE; | |
213 | ||
214 | if (pmsg && | |
215 | pmsg->cp_magic == rpcrdma_cmp_magic && | |
216 | pmsg->cp_version == RPCRDMA_CMP_VERSION) { | |
c8b920bb | 217 | r_xprt->rx_ia.ri_reminv_expected = true; |
87cfb9a0 CL |
218 | rsize = rpcrdma_decode_buffer_size(pmsg->cp_send_size); |
219 | wsize = rpcrdma_decode_buffer_size(pmsg->cp_recv_size); | |
220 | } | |
221 | ||
222 | if (rsize < cdata->inline_rsize) | |
223 | cdata->inline_rsize = rsize; | |
224 | if (wsize < cdata->inline_wsize) | |
225 | cdata->inline_wsize = wsize; | |
226 | pr_info("rpcrdma: max send %u, max recv %u\n", | |
227 | cdata->inline_wsize, cdata->inline_rsize); | |
228 | rpcrdma_set_max_header_sizes(r_xprt); | |
229 | } | |
230 | ||
c56c65fb TT |
231 | static int |
232 | rpcrdma_conn_upcall(struct rdma_cm_id *id, struct rdma_cm_event *event) | |
233 | { | |
234 | struct rpcrdma_xprt *xprt = id->context; | |
235 | struct rpcrdma_ia *ia = &xprt->rx_ia; | |
236 | struct rpcrdma_ep *ep = &xprt->rx_ep; | |
f895b252 | 237 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
0dd39cae | 238 | struct sockaddr *sap = (struct sockaddr *)&ep->rep_remote_addr; |
ff0db049 | 239 | #endif |
ce1ab9ab CL |
240 | struct ib_qp_attr *attr = &ia->ri_qp_attr; |
241 | struct ib_qp_init_attr *iattr = &ia->ri_qp_init_attr; | |
c56c65fb TT |
242 | int connstate = 0; |
243 | ||
244 | switch (event->event) { | |
245 | case RDMA_CM_EVENT_ADDR_RESOLVED: | |
246 | case RDMA_CM_EVENT_ROUTE_RESOLVED: | |
5675add3 | 247 | ia->ri_async_rc = 0; |
c56c65fb TT |
248 | complete(&ia->ri_done); |
249 | break; | |
250 | case RDMA_CM_EVENT_ADDR_ERROR: | |
251 | ia->ri_async_rc = -EHOSTUNREACH; | |
252 | dprintk("RPC: %s: CM address resolution error, ep 0x%p\n", | |
253 | __func__, ep); | |
254 | complete(&ia->ri_done); | |
255 | break; | |
256 | case RDMA_CM_EVENT_ROUTE_ERROR: | |
257 | ia->ri_async_rc = -ENETUNREACH; | |
258 | dprintk("RPC: %s: CM route resolution error, ep 0x%p\n", | |
259 | __func__, ep); | |
260 | complete(&ia->ri_done); | |
261 | break; | |
262 | case RDMA_CM_EVENT_ESTABLISHED: | |
263 | connstate = 1; | |
ce1ab9ab CL |
264 | ib_query_qp(ia->ri_id->qp, attr, |
265 | IB_QP_MAX_QP_RD_ATOMIC | IB_QP_MAX_DEST_RD_ATOMIC, | |
266 | iattr); | |
c56c65fb TT |
267 | dprintk("RPC: %s: %d responder resources" |
268 | " (%d initiator)\n", | |
ce1ab9ab CL |
269 | __func__, attr->max_dest_rd_atomic, |
270 | attr->max_rd_atomic); | |
87cfb9a0 | 271 | rpcrdma_update_connect_private(xprt, &event->param.conn); |
c56c65fb TT |
272 | goto connected; |
273 | case RDMA_CM_EVENT_CONNECT_ERROR: | |
274 | connstate = -ENOTCONN; | |
275 | goto connected; | |
276 | case RDMA_CM_EVENT_UNREACHABLE: | |
277 | connstate = -ENETDOWN; | |
278 | goto connected; | |
279 | case RDMA_CM_EVENT_REJECTED: | |
280 | connstate = -ECONNREFUSED; | |
281 | goto connected; | |
282 | case RDMA_CM_EVENT_DISCONNECTED: | |
283 | connstate = -ECONNABORTED; | |
284 | goto connected; | |
285 | case RDMA_CM_EVENT_DEVICE_REMOVAL: | |
286 | connstate = -ENODEV; | |
287 | connected: | |
c56c65fb TT |
288 | dprintk("RPC: %s: %sconnected\n", |
289 | __func__, connstate > 0 ? "" : "dis"); | |
23826c7a | 290 | atomic_set(&xprt->rx_buf.rb_credits, 1); |
c56c65fb | 291 | ep->rep_connected = connstate; |
afadc468 | 292 | rpcrdma_conn_func(ep); |
c56c65fb | 293 | wake_up_all(&ep->rep_connect_wait); |
8079fb78 | 294 | /*FALLTHROUGH*/ |
c56c65fb | 295 | default: |
0dd39cae CL |
296 | dprintk("RPC: %s: %pIS:%u (ep 0x%p): %s\n", |
297 | __func__, sap, rpc_get_port(sap), ep, | |
76357c71 | 298 | rdma_event_msg(event->event)); |
c56c65fb TT |
299 | break; |
300 | } | |
301 | ||
f895b252 | 302 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
b3cd8d45 | 303 | if (connstate == 1) { |
ce1ab9ab | 304 | int ird = attr->max_dest_rd_atomic; |
b3cd8d45 | 305 | int tird = ep->rep_remote_cma.responder_resources; |
0dd39cae | 306 | |
a0ce85f5 | 307 | pr_info("rpcrdma: connection to %pIS:%u on %s, memreg '%s', %d credits, %d responders%s\n", |
0dd39cae | 308 | sap, rpc_get_port(sap), |
89e0d112 | 309 | ia->ri_device->name, |
a0ce85f5 | 310 | ia->ri_ops->ro_displayname, |
b3cd8d45 TT |
311 | xprt->rx_buf.rb_max_requests, |
312 | ird, ird < 4 && ird < tird / 2 ? " (low!)" : ""); | |
313 | } else if (connstate < 0) { | |
0dd39cae CL |
314 | pr_info("rpcrdma: connection to %pIS:%u closed (%d)\n", |
315 | sap, rpc_get_port(sap), connstate); | |
b3cd8d45 TT |
316 | } |
317 | #endif | |
318 | ||
c56c65fb TT |
319 | return 0; |
320 | } | |
321 | ||
d0f36c46 DS |
322 | static void rpcrdma_destroy_id(struct rdma_cm_id *id) |
323 | { | |
324 | if (id) { | |
325 | module_put(id->device->owner); | |
326 | rdma_destroy_id(id); | |
327 | } | |
328 | } | |
329 | ||
c56c65fb TT |
330 | static struct rdma_cm_id * |
331 | rpcrdma_create_id(struct rpcrdma_xprt *xprt, | |
332 | struct rpcrdma_ia *ia, struct sockaddr *addr) | |
333 | { | |
334 | struct rdma_cm_id *id; | |
335 | int rc; | |
336 | ||
1a954051 TT |
337 | init_completion(&ia->ri_done); |
338 | ||
fa20105e GS |
339 | id = rdma_create_id(&init_net, rpcrdma_conn_upcall, xprt, RDMA_PS_TCP, |
340 | IB_QPT_RC); | |
c56c65fb TT |
341 | if (IS_ERR(id)) { |
342 | rc = PTR_ERR(id); | |
343 | dprintk("RPC: %s: rdma_create_id() failed %i\n", | |
344 | __func__, rc); | |
345 | return id; | |
346 | } | |
347 | ||
5675add3 | 348 | ia->ri_async_rc = -ETIMEDOUT; |
c56c65fb TT |
349 | rc = rdma_resolve_addr(id, NULL, addr, RDMA_RESOLVE_TIMEOUT); |
350 | if (rc) { | |
351 | dprintk("RPC: %s: rdma_resolve_addr() failed %i\n", | |
352 | __func__, rc); | |
353 | goto out; | |
354 | } | |
5675add3 TT |
355 | wait_for_completion_interruptible_timeout(&ia->ri_done, |
356 | msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1); | |
d0f36c46 DS |
357 | |
358 | /* FIXME: | |
359 | * Until xprtrdma supports DEVICE_REMOVAL, the provider must | |
360 | * be pinned while there are active NFS/RDMA mounts to prevent | |
361 | * hangs and crashes at umount time. | |
362 | */ | |
363 | if (!ia->ri_async_rc && !try_module_get(id->device->owner)) { | |
364 | dprintk("RPC: %s: Failed to get device module\n", | |
365 | __func__); | |
366 | ia->ri_async_rc = -ENODEV; | |
367 | } | |
c56c65fb TT |
368 | rc = ia->ri_async_rc; |
369 | if (rc) | |
370 | goto out; | |
371 | ||
5675add3 | 372 | ia->ri_async_rc = -ETIMEDOUT; |
c56c65fb TT |
373 | rc = rdma_resolve_route(id, RDMA_RESOLVE_TIMEOUT); |
374 | if (rc) { | |
375 | dprintk("RPC: %s: rdma_resolve_route() failed %i\n", | |
376 | __func__, rc); | |
d0f36c46 | 377 | goto put; |
c56c65fb | 378 | } |
5675add3 TT |
379 | wait_for_completion_interruptible_timeout(&ia->ri_done, |
380 | msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1); | |
c56c65fb TT |
381 | rc = ia->ri_async_rc; |
382 | if (rc) | |
d0f36c46 | 383 | goto put; |
c56c65fb TT |
384 | |
385 | return id; | |
d0f36c46 DS |
386 | put: |
387 | module_put(id->device->owner); | |
c56c65fb TT |
388 | out: |
389 | rdma_destroy_id(id); | |
390 | return ERR_PTR(rc); | |
391 | } | |
392 | ||
c56c65fb TT |
393 | /* |
394 | * Exported functions. | |
395 | */ | |
396 | ||
397 | /* | |
398 | * Open and initialize an Interface Adapter. | |
399 | * o initializes fields of struct rpcrdma_ia, including | |
400 | * interface and provider attributes and protection zone. | |
401 | */ | |
402 | int | |
403 | rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg) | |
404 | { | |
c56c65fb | 405 | struct rpcrdma_ia *ia = &xprt->rx_ia; |
d1ed857e CL |
406 | int rc; |
407 | ||
c56c65fb TT |
408 | ia->ri_id = rpcrdma_create_id(xprt, ia, addr); |
409 | if (IS_ERR(ia->ri_id)) { | |
410 | rc = PTR_ERR(ia->ri_id); | |
411 | goto out1; | |
412 | } | |
89e0d112 | 413 | ia->ri_device = ia->ri_id->device; |
c56c65fb | 414 | |
ed082d36 | 415 | ia->ri_pd = ib_alloc_pd(ia->ri_device, 0); |
c56c65fb TT |
416 | if (IS_ERR(ia->ri_pd)) { |
417 | rc = PTR_ERR(ia->ri_pd); | |
b54054ca | 418 | pr_err("rpcrdma: ib_alloc_pd() returned %d\n", rc); |
c56c65fb TT |
419 | goto out2; |
420 | } | |
421 | ||
bd7ed1d1 | 422 | switch (memreg) { |
3197d309 | 423 | case RPCRDMA_FRMR: |
b54054ca CL |
424 | if (frwr_is_supported(ia)) { |
425 | ia->ri_ops = &rpcrdma_frwr_memreg_ops; | |
426 | break; | |
427 | } | |
428 | /*FALLTHROUGH*/ | |
bd7ed1d1 | 429 | case RPCRDMA_MTHCAFMR: |
b54054ca CL |
430 | if (fmr_is_supported(ia)) { |
431 | ia->ri_ops = &rpcrdma_fmr_memreg_ops; | |
432 | break; | |
433 | } | |
434 | /*FALLTHROUGH*/ | |
bd7ed1d1 | 435 | default: |
b54054ca CL |
436 | pr_err("rpcrdma: Unsupported memory registration mode: %d\n", |
437 | memreg); | |
438 | rc = -EINVAL; | |
5ae711a2 | 439 | goto out3; |
c56c65fb TT |
440 | } |
441 | ||
c56c65fb | 442 | return 0; |
5ae711a2 CL |
443 | |
444 | out3: | |
445 | ib_dealloc_pd(ia->ri_pd); | |
446 | ia->ri_pd = NULL; | |
c56c65fb | 447 | out2: |
d0f36c46 | 448 | rpcrdma_destroy_id(ia->ri_id); |
fee08caf | 449 | ia->ri_id = NULL; |
c56c65fb TT |
450 | out1: |
451 | return rc; | |
452 | } | |
453 | ||
454 | /* | |
455 | * Clean up/close an IA. | |
456 | * o if event handles and PD have been initialized, free them. | |
457 | * o close the IA | |
458 | */ | |
459 | void | |
460 | rpcrdma_ia_close(struct rpcrdma_ia *ia) | |
461 | { | |
c56c65fb | 462 | dprintk("RPC: %s: entering\n", __func__); |
fee08caf TT |
463 | if (ia->ri_id != NULL && !IS_ERR(ia->ri_id)) { |
464 | if (ia->ri_id->qp) | |
465 | rdma_destroy_qp(ia->ri_id); | |
d0f36c46 | 466 | rpcrdma_destroy_id(ia->ri_id); |
fee08caf TT |
467 | ia->ri_id = NULL; |
468 | } | |
6d44698d CL |
469 | |
470 | /* If the pd is still busy, xprtrdma missed freeing a resource */ | |
471 | if (ia->ri_pd && !IS_ERR(ia->ri_pd)) | |
7dd78647 | 472 | ib_dealloc_pd(ia->ri_pd); |
c56c65fb TT |
473 | } |
474 | ||
475 | /* | |
476 | * Create unconnected endpoint. | |
477 | */ | |
478 | int | |
479 | rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia, | |
480 | struct rpcrdma_create_data_internal *cdata) | |
481 | { | |
87cfb9a0 | 482 | struct rpcrdma_connect_private *pmsg = &ep->rep_cm_private; |
fc664485 | 483 | struct ib_cq *sendcq, *recvcq; |
124fa17d | 484 | unsigned int max_qp_wr; |
2fa8f88d | 485 | int rc; |
c56c65fb | 486 | |
655fec69 | 487 | if (ia->ri_device->attrs.max_sge < RPCRDMA_MAX_SEND_SGES) { |
b3221d6a CL |
488 | dprintk("RPC: %s: insufficient sge's available\n", |
489 | __func__); | |
490 | return -ENOMEM; | |
491 | } | |
492 | ||
e3e45b1b | 493 | if (ia->ri_device->attrs.max_qp_wr <= RPCRDMA_BACKWARD_WRS) { |
124fa17d CL |
494 | dprintk("RPC: %s: insufficient wqe's available\n", |
495 | __func__); | |
496 | return -ENOMEM; | |
497 | } | |
550d7502 | 498 | max_qp_wr = ia->ri_device->attrs.max_qp_wr - RPCRDMA_BACKWARD_WRS - 1; |
124fa17d | 499 | |
c56c65fb | 500 | /* check provider's send/recv wr limits */ |
124fa17d CL |
501 | if (cdata->max_requests > max_qp_wr) |
502 | cdata->max_requests = max_qp_wr; | |
c56c65fb TT |
503 | |
504 | ep->rep_attr.event_handler = rpcrdma_qp_async_error_upcall; | |
505 | ep->rep_attr.qp_context = ep; | |
c56c65fb TT |
506 | ep->rep_attr.srq = NULL; |
507 | ep->rep_attr.cap.max_send_wr = cdata->max_requests; | |
124fa17d | 508 | ep->rep_attr.cap.max_send_wr += RPCRDMA_BACKWARD_WRS; |
550d7502 | 509 | ep->rep_attr.cap.max_send_wr += 1; /* drain cqe */ |
3968cb58 CL |
510 | rc = ia->ri_ops->ro_open(ia, ep, cdata); |
511 | if (rc) | |
512 | return rc; | |
c56c65fb | 513 | ep->rep_attr.cap.max_recv_wr = cdata->max_requests; |
124fa17d | 514 | ep->rep_attr.cap.max_recv_wr += RPCRDMA_BACKWARD_WRS; |
550d7502 | 515 | ep->rep_attr.cap.max_recv_wr += 1; /* drain cqe */ |
655fec69 | 516 | ep->rep_attr.cap.max_send_sge = RPCRDMA_MAX_SEND_SGES; |
c56c65fb TT |
517 | ep->rep_attr.cap.max_recv_sge = 1; |
518 | ep->rep_attr.cap.max_inline_data = 0; | |
519 | ep->rep_attr.sq_sig_type = IB_SIGNAL_REQ_WR; | |
520 | ep->rep_attr.qp_type = IB_QPT_RC; | |
521 | ep->rep_attr.port_num = ~0; | |
522 | ||
523 | dprintk("RPC: %s: requested max: dtos: send %d recv %d; " | |
524 | "iovs: send %d recv %d\n", | |
525 | __func__, | |
526 | ep->rep_attr.cap.max_send_wr, | |
527 | ep->rep_attr.cap.max_recv_wr, | |
528 | ep->rep_attr.cap.max_send_sge, | |
529 | ep->rep_attr.cap.max_recv_sge); | |
530 | ||
531 | /* set trigger for requesting send completion */ | |
fc664485 | 532 | ep->rep_cqinit = ep->rep_attr.cap.max_send_wr/2 - 1; |
26ae9d1c CL |
533 | if (ep->rep_cqinit <= 2) |
534 | ep->rep_cqinit = 0; /* always signal? */ | |
c56c65fb | 535 | INIT_CQCOUNT(ep); |
c56c65fb | 536 | init_waitqueue_head(&ep->rep_connect_wait); |
254f91e2 | 537 | INIT_DELAYED_WORK(&ep->rep_connect_worker, rpcrdma_connect_worker); |
c56c65fb | 538 | |
2fa8f88d CL |
539 | sendcq = ib_alloc_cq(ia->ri_device, NULL, |
540 | ep->rep_attr.cap.max_send_wr + 1, | |
541 | 0, IB_POLL_SOFTIRQ); | |
fc664485 CL |
542 | if (IS_ERR(sendcq)) { |
543 | rc = PTR_ERR(sendcq); | |
544 | dprintk("RPC: %s: failed to create send CQ: %i\n", | |
c56c65fb TT |
545 | __func__, rc); |
546 | goto out1; | |
547 | } | |
548 | ||
552bf225 CL |
549 | recvcq = ib_alloc_cq(ia->ri_device, NULL, |
550 | ep->rep_attr.cap.max_recv_wr + 1, | |
551 | 0, IB_POLL_SOFTIRQ); | |
fc664485 CL |
552 | if (IS_ERR(recvcq)) { |
553 | rc = PTR_ERR(recvcq); | |
554 | dprintk("RPC: %s: failed to create recv CQ: %i\n", | |
555 | __func__, rc); | |
556 | goto out2; | |
557 | } | |
558 | ||
fc664485 CL |
559 | ep->rep_attr.send_cq = sendcq; |
560 | ep->rep_attr.recv_cq = recvcq; | |
c56c65fb TT |
561 | |
562 | /* Initialize cma parameters */ | |
b2dde94b | 563 | memset(&ep->rep_remote_cma, 0, sizeof(ep->rep_remote_cma)); |
c56c65fb | 564 | |
87cfb9a0 CL |
565 | /* Prepare RDMA-CM private message */ |
566 | pmsg->cp_magic = rpcrdma_cmp_magic; | |
567 | pmsg->cp_version = RPCRDMA_CMP_VERSION; | |
c8b920bb | 568 | pmsg->cp_flags |= ia->ri_ops->ro_send_w_inv_ok; |
87cfb9a0 CL |
569 | pmsg->cp_send_size = rpcrdma_encode_buffer_size(cdata->inline_wsize); |
570 | pmsg->cp_recv_size = rpcrdma_encode_buffer_size(cdata->inline_rsize); | |
571 | ep->rep_remote_cma.private_data = pmsg; | |
572 | ep->rep_remote_cma.private_data_len = sizeof(*pmsg); | |
c56c65fb TT |
573 | |
574 | /* Client offers RDMA Read but does not initiate */ | |
b334eaab | 575 | ep->rep_remote_cma.initiator_depth = 0; |
e3e45b1b | 576 | if (ia->ri_device->attrs.max_qp_rd_atom > 32) /* arbitrary but <= 255 */ |
b334eaab TT |
577 | ep->rep_remote_cma.responder_resources = 32; |
578 | else | |
7bc7972c | 579 | ep->rep_remote_cma.responder_resources = |
e3e45b1b | 580 | ia->ri_device->attrs.max_qp_rd_atom; |
c56c65fb | 581 | |
b2dde94b CL |
582 | /* Limit transport retries so client can detect server |
583 | * GID changes quickly. RPC layer handles re-establishing | |
584 | * transport connection and retransmission. | |
585 | */ | |
586 | ep->rep_remote_cma.retry_count = 6; | |
587 | ||
588 | /* RPC-over-RDMA handles its own flow control. In addition, | |
589 | * make all RNR NAKs visible so we know that RPC-over-RDMA | |
590 | * flow control is working correctly (no NAKs should be seen). | |
591 | */ | |
c56c65fb TT |
592 | ep->rep_remote_cma.flow_control = 0; |
593 | ep->rep_remote_cma.rnr_retry_count = 0; | |
594 | ||
595 | return 0; | |
596 | ||
597 | out2: | |
2fa8f88d | 598 | ib_free_cq(sendcq); |
c56c65fb TT |
599 | out1: |
600 | return rc; | |
601 | } | |
602 | ||
603 | /* | |
604 | * rpcrdma_ep_destroy | |
605 | * | |
606 | * Disconnect and destroy endpoint. After this, the only | |
607 | * valid operations on the ep are to free it (if dynamically | |
608 | * allocated) or re-create it. | |
c56c65fb | 609 | */ |
7f1d5419 | 610 | void |
c56c65fb TT |
611 | rpcrdma_ep_destroy(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) |
612 | { | |
c56c65fb TT |
613 | dprintk("RPC: %s: entering, connected is %d\n", |
614 | __func__, ep->rep_connected); | |
615 | ||
254f91e2 CL |
616 | cancel_delayed_work_sync(&ep->rep_connect_worker); |
617 | ||
72c02173 | 618 | if (ia->ri_id->qp) { |
550d7502 | 619 | rpcrdma_ep_disconnect(ep, ia); |
fee08caf TT |
620 | rdma_destroy_qp(ia->ri_id); |
621 | ia->ri_id->qp = NULL; | |
c56c65fb TT |
622 | } |
623 | ||
552bf225 | 624 | ib_free_cq(ep->rep_attr.recv_cq); |
2fa8f88d | 625 | ib_free_cq(ep->rep_attr.send_cq); |
c56c65fb TT |
626 | } |
627 | ||
628 | /* | |
629 | * Connect unconnected endpoint. | |
630 | */ | |
631 | int | |
632 | rpcrdma_ep_connect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) | |
633 | { | |
73806c88 | 634 | struct rdma_cm_id *id, *old; |
c56c65fb TT |
635 | int rc = 0; |
636 | int retry_count = 0; | |
c56c65fb | 637 | |
c055551e | 638 | if (ep->rep_connected != 0) { |
c56c65fb TT |
639 | struct rpcrdma_xprt *xprt; |
640 | retry: | |
ec62f40d | 641 | dprintk("RPC: %s: reconnecting...\n", __func__); |
282191cb CL |
642 | |
643 | rpcrdma_ep_disconnect(ep, ia); | |
c56c65fb TT |
644 | |
645 | xprt = container_of(ia, struct rpcrdma_xprt, rx_ia); | |
646 | id = rpcrdma_create_id(xprt, ia, | |
647 | (struct sockaddr *)&xprt->rx_data.addr); | |
648 | if (IS_ERR(id)) { | |
ec62f40d | 649 | rc = -EHOSTUNREACH; |
c56c65fb TT |
650 | goto out; |
651 | } | |
652 | /* TEMP TEMP TEMP - fail if new device: | |
653 | * Deregister/remarshal *all* requests! | |
654 | * Close and recreate adapter, pd, etc! | |
655 | * Re-determine all attributes still sane! | |
656 | * More stuff I haven't thought of! | |
657 | * Rrrgh! | |
658 | */ | |
89e0d112 | 659 | if (ia->ri_device != id->device) { |
c56c65fb TT |
660 | printk("RPC: %s: can't reconnect on " |
661 | "different device!\n", __func__); | |
d0f36c46 | 662 | rpcrdma_destroy_id(id); |
ec62f40d | 663 | rc = -ENETUNREACH; |
c56c65fb TT |
664 | goto out; |
665 | } | |
666 | /* END TEMP */ | |
ec62f40d CL |
667 | rc = rdma_create_qp(id, ia->ri_pd, &ep->rep_attr); |
668 | if (rc) { | |
669 | dprintk("RPC: %s: rdma_create_qp failed %i\n", | |
670 | __func__, rc); | |
d0f36c46 | 671 | rpcrdma_destroy_id(id); |
ec62f40d CL |
672 | rc = -ENETUNREACH; |
673 | goto out; | |
674 | } | |
73806c88 | 675 | |
73806c88 | 676 | old = ia->ri_id; |
c56c65fb | 677 | ia->ri_id = id; |
73806c88 CL |
678 | |
679 | rdma_destroy_qp(old); | |
d0f36c46 | 680 | rpcrdma_destroy_id(old); |
ec62f40d CL |
681 | } else { |
682 | dprintk("RPC: %s: connecting...\n", __func__); | |
683 | rc = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr); | |
684 | if (rc) { | |
685 | dprintk("RPC: %s: rdma_create_qp failed %i\n", | |
686 | __func__, rc); | |
687 | /* do not update ep->rep_connected */ | |
688 | return -ENETUNREACH; | |
689 | } | |
c56c65fb TT |
690 | } |
691 | ||
c56c65fb TT |
692 | ep->rep_connected = 0; |
693 | ||
694 | rc = rdma_connect(ia->ri_id, &ep->rep_remote_cma); | |
695 | if (rc) { | |
696 | dprintk("RPC: %s: rdma_connect() failed with %i\n", | |
697 | __func__, rc); | |
698 | goto out; | |
699 | } | |
700 | ||
c56c65fb TT |
701 | wait_event_interruptible(ep->rep_connect_wait, ep->rep_connected != 0); |
702 | ||
703 | /* | |
704 | * Check state. A non-peer reject indicates no listener | |
705 | * (ECONNREFUSED), which may be a transient state. All | |
706 | * others indicate a transport condition which has already | |
707 | * undergone a best-effort. | |
708 | */ | |
f64f9e71 JP |
709 | if (ep->rep_connected == -ECONNREFUSED && |
710 | ++retry_count <= RDMA_CONNECT_RETRY_MAX) { | |
c56c65fb TT |
711 | dprintk("RPC: %s: non-peer_reject, retry\n", __func__); |
712 | goto retry; | |
713 | } | |
714 | if (ep->rep_connected <= 0) { | |
715 | /* Sometimes, the only way to reliably connect to remote | |
716 | * CMs is to use same nonzero values for ORD and IRD. */ | |
b334eaab TT |
717 | if (retry_count++ <= RDMA_CONNECT_RETRY_MAX + 1 && |
718 | (ep->rep_remote_cma.responder_resources == 0 || | |
719 | ep->rep_remote_cma.initiator_depth != | |
720 | ep->rep_remote_cma.responder_resources)) { | |
721 | if (ep->rep_remote_cma.responder_resources == 0) | |
722 | ep->rep_remote_cma.responder_resources = 1; | |
723 | ep->rep_remote_cma.initiator_depth = | |
724 | ep->rep_remote_cma.responder_resources; | |
c56c65fb | 725 | goto retry; |
b334eaab | 726 | } |
c56c65fb TT |
727 | rc = ep->rep_connected; |
728 | } else { | |
f531a5db CL |
729 | struct rpcrdma_xprt *r_xprt; |
730 | unsigned int extras; | |
731 | ||
c56c65fb | 732 | dprintk("RPC: %s: connected\n", __func__); |
f531a5db CL |
733 | |
734 | r_xprt = container_of(ia, struct rpcrdma_xprt, rx_ia); | |
735 | extras = r_xprt->rx_buf.rb_bc_srv_max_requests; | |
736 | ||
737 | if (extras) { | |
738 | rc = rpcrdma_ep_post_extra_recv(r_xprt, extras); | |
38b95bcf | 739 | if (rc) { |
f531a5db CL |
740 | pr_warn("%s: rpcrdma_ep_post_extra_recv: %i\n", |
741 | __func__, rc); | |
742 | rc = 0; | |
38b95bcf | 743 | } |
f531a5db | 744 | } |
c56c65fb TT |
745 | } |
746 | ||
747 | out: | |
748 | if (rc) | |
749 | ep->rep_connected = rc; | |
750 | return rc; | |
751 | } | |
752 | ||
753 | /* | |
754 | * rpcrdma_ep_disconnect | |
755 | * | |
756 | * This is separate from destroy to facilitate the ability | |
757 | * to reconnect without recreating the endpoint. | |
758 | * | |
759 | * This call is not reentrant, and must not be made in parallel | |
760 | * on the same endpoint. | |
761 | */ | |
282191cb | 762 | void |
c56c65fb TT |
763 | rpcrdma_ep_disconnect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) |
764 | { | |
765 | int rc; | |
766 | ||
c56c65fb TT |
767 | rc = rdma_disconnect(ia->ri_id); |
768 | if (!rc) { | |
769 | /* returns without wait if not connected */ | |
770 | wait_event_interruptible(ep->rep_connect_wait, | |
771 | ep->rep_connected != 1); | |
772 | dprintk("RPC: %s: after wait, %sconnected\n", __func__, | |
773 | (ep->rep_connected == 1) ? "still " : "dis"); | |
774 | } else { | |
775 | dprintk("RPC: %s: rdma_disconnect %i\n", __func__, rc); | |
776 | ep->rep_connected = rc; | |
777 | } | |
550d7502 CL |
778 | |
779 | ib_drain_qp(ia->ri_id->qp); | |
c56c65fb TT |
780 | } |
781 | ||
505bbe64 CL |
782 | static void |
783 | rpcrdma_mr_recovery_worker(struct work_struct *work) | |
784 | { | |
785 | struct rpcrdma_buffer *buf = container_of(work, struct rpcrdma_buffer, | |
786 | rb_recovery_worker.work); | |
787 | struct rpcrdma_mw *mw; | |
788 | ||
789 | spin_lock(&buf->rb_recovery_lock); | |
790 | while (!list_empty(&buf->rb_stale_mrs)) { | |
791 | mw = list_first_entry(&buf->rb_stale_mrs, | |
792 | struct rpcrdma_mw, mw_list); | |
793 | list_del_init(&mw->mw_list); | |
794 | spin_unlock(&buf->rb_recovery_lock); | |
795 | ||
796 | dprintk("RPC: %s: recovering MR %p\n", __func__, mw); | |
797 | mw->mw_xprt->rx_ia.ri_ops->ro_recover_mr(mw); | |
798 | ||
799 | spin_lock(&buf->rb_recovery_lock); | |
53d78523 | 800 | } |
505bbe64 CL |
801 | spin_unlock(&buf->rb_recovery_lock); |
802 | } | |
803 | ||
804 | void | |
805 | rpcrdma_defer_mr_recovery(struct rpcrdma_mw *mw) | |
806 | { | |
807 | struct rpcrdma_xprt *r_xprt = mw->mw_xprt; | |
808 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; | |
809 | ||
810 | spin_lock(&buf->rb_recovery_lock); | |
811 | list_add(&mw->mw_list, &buf->rb_stale_mrs); | |
812 | spin_unlock(&buf->rb_recovery_lock); | |
813 | ||
814 | schedule_delayed_work(&buf->rb_recovery_worker, 0); | |
815 | } | |
816 | ||
e2ac236c CL |
817 | static void |
818 | rpcrdma_create_mrs(struct rpcrdma_xprt *r_xprt) | |
819 | { | |
820 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; | |
821 | struct rpcrdma_ia *ia = &r_xprt->rx_ia; | |
822 | unsigned int count; | |
823 | LIST_HEAD(free); | |
824 | LIST_HEAD(all); | |
825 | ||
826 | for (count = 0; count < 32; count++) { | |
827 | struct rpcrdma_mw *mw; | |
828 | int rc; | |
829 | ||
830 | mw = kzalloc(sizeof(*mw), GFP_KERNEL); | |
831 | if (!mw) | |
832 | break; | |
833 | ||
834 | rc = ia->ri_ops->ro_init_mr(ia, mw); | |
835 | if (rc) { | |
836 | kfree(mw); | |
837 | break; | |
838 | } | |
839 | ||
840 | mw->mw_xprt = r_xprt; | |
841 | ||
842 | list_add(&mw->mw_list, &free); | |
843 | list_add(&mw->mw_all, &all); | |
844 | } | |
845 | ||
846 | spin_lock(&buf->rb_mwlock); | |
847 | list_splice(&free, &buf->rb_mws); | |
848 | list_splice(&all, &buf->rb_all); | |
849 | r_xprt->rx_stats.mrs_allocated += count; | |
850 | spin_unlock(&buf->rb_mwlock); | |
851 | ||
852 | dprintk("RPC: %s: created %u MRs\n", __func__, count); | |
853 | } | |
854 | ||
855 | static void | |
856 | rpcrdma_mr_refresh_worker(struct work_struct *work) | |
857 | { | |
858 | struct rpcrdma_buffer *buf = container_of(work, struct rpcrdma_buffer, | |
859 | rb_refresh_worker.work); | |
860 | struct rpcrdma_xprt *r_xprt = container_of(buf, struct rpcrdma_xprt, | |
861 | rx_buf); | |
862 | ||
863 | rpcrdma_create_mrs(r_xprt); | |
864 | } | |
865 | ||
f531a5db | 866 | struct rpcrdma_req * |
1392402c CL |
867 | rpcrdma_create_req(struct rpcrdma_xprt *r_xprt) |
868 | { | |
f531a5db | 869 | struct rpcrdma_buffer *buffer = &r_xprt->rx_buf; |
1392402c | 870 | struct rpcrdma_req *req; |
1392402c | 871 | |
85275c87 | 872 | req = kzalloc(sizeof(*req), GFP_KERNEL); |
1392402c | 873 | if (req == NULL) |
85275c87 | 874 | return ERR_PTR(-ENOMEM); |
1392402c | 875 | |
f531a5db CL |
876 | INIT_LIST_HEAD(&req->rl_free); |
877 | spin_lock(&buffer->rb_reqslock); | |
878 | list_add(&req->rl_all, &buffer->rb_allreqs); | |
879 | spin_unlock(&buffer->rb_reqslock); | |
2fa8f88d | 880 | req->rl_cqe.done = rpcrdma_wc_send; |
1392402c | 881 | req->rl_buffer = &r_xprt->rx_buf; |
9d6b0409 | 882 | INIT_LIST_HEAD(&req->rl_registered); |
90aab602 CL |
883 | req->rl_send_wr.next = NULL; |
884 | req->rl_send_wr.wr_cqe = &req->rl_cqe; | |
655fec69 | 885 | req->rl_send_wr.sg_list = req->rl_send_sge; |
90aab602 | 886 | req->rl_send_wr.opcode = IB_WR_SEND; |
1392402c | 887 | return req; |
1392402c CL |
888 | } |
889 | ||
f531a5db | 890 | struct rpcrdma_rep * |
1392402c CL |
891 | rpcrdma_create_rep(struct rpcrdma_xprt *r_xprt) |
892 | { | |
893 | struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data; | |
1392402c CL |
894 | struct rpcrdma_ia *ia = &r_xprt->rx_ia; |
895 | struct rpcrdma_rep *rep; | |
896 | int rc; | |
897 | ||
898 | rc = -ENOMEM; | |
6b1184cd | 899 | rep = kzalloc(sizeof(*rep), GFP_KERNEL); |
1392402c CL |
900 | if (rep == NULL) |
901 | goto out; | |
1392402c | 902 | |
13650c23 | 903 | rep->rr_rdmabuf = rpcrdma_alloc_regbuf(cdata->inline_rsize, |
99ef4db3 | 904 | DMA_FROM_DEVICE, GFP_KERNEL); |
6b1184cd CL |
905 | if (IS_ERR(rep->rr_rdmabuf)) { |
906 | rc = PTR_ERR(rep->rr_rdmabuf); | |
1392402c | 907 | goto out_free; |
6b1184cd | 908 | } |
1392402c | 909 | |
89e0d112 | 910 | rep->rr_device = ia->ri_device; |
1519e969 | 911 | rep->rr_cqe.done = rpcrdma_wc_receive; |
fed171b3 | 912 | rep->rr_rxprt = r_xprt; |
496b77a5 | 913 | INIT_WORK(&rep->rr_work, rpcrdma_reply_handler); |
6ea8e711 CL |
914 | rep->rr_recv_wr.next = NULL; |
915 | rep->rr_recv_wr.wr_cqe = &rep->rr_cqe; | |
916 | rep->rr_recv_wr.sg_list = &rep->rr_rdmabuf->rg_iov; | |
917 | rep->rr_recv_wr.num_sge = 1; | |
1392402c CL |
918 | return rep; |
919 | ||
920 | out_free: | |
921 | kfree(rep); | |
922 | out: | |
923 | return ERR_PTR(rc); | |
924 | } | |
925 | ||
c56c65fb | 926 | int |
ac920d04 | 927 | rpcrdma_buffer_create(struct rpcrdma_xprt *r_xprt) |
c56c65fb | 928 | { |
ac920d04 | 929 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; |
c56c65fb TT |
930 | int i, rc; |
931 | ||
1e465fd4 | 932 | buf->rb_max_requests = r_xprt->rx_data.max_requests; |
f531a5db | 933 | buf->rb_bc_srv_max_requests = 0; |
23826c7a | 934 | atomic_set(&buf->rb_credits, 1); |
e2ac236c | 935 | spin_lock_init(&buf->rb_mwlock); |
505bbe64 CL |
936 | spin_lock_init(&buf->rb_lock); |
937 | spin_lock_init(&buf->rb_recovery_lock); | |
e2ac236c CL |
938 | INIT_LIST_HEAD(&buf->rb_mws); |
939 | INIT_LIST_HEAD(&buf->rb_all); | |
505bbe64 | 940 | INIT_LIST_HEAD(&buf->rb_stale_mrs); |
e2ac236c CL |
941 | INIT_DELAYED_WORK(&buf->rb_refresh_worker, |
942 | rpcrdma_mr_refresh_worker); | |
505bbe64 CL |
943 | INIT_DELAYED_WORK(&buf->rb_recovery_worker, |
944 | rpcrdma_mr_recovery_worker); | |
c56c65fb | 945 | |
e2ac236c | 946 | rpcrdma_create_mrs(r_xprt); |
c56c65fb | 947 | |
1e465fd4 | 948 | INIT_LIST_HEAD(&buf->rb_send_bufs); |
f531a5db CL |
949 | INIT_LIST_HEAD(&buf->rb_allreqs); |
950 | spin_lock_init(&buf->rb_reqslock); | |
c56c65fb TT |
951 | for (i = 0; i < buf->rb_max_requests; i++) { |
952 | struct rpcrdma_req *req; | |
c56c65fb | 953 | |
1392402c CL |
954 | req = rpcrdma_create_req(r_xprt); |
955 | if (IS_ERR(req)) { | |
c56c65fb TT |
956 | dprintk("RPC: %s: request buffer %d alloc" |
957 | " failed\n", __func__, i); | |
1392402c | 958 | rc = PTR_ERR(req); |
c56c65fb TT |
959 | goto out; |
960 | } | |
f531a5db | 961 | req->rl_backchannel = false; |
1e465fd4 CL |
962 | list_add(&req->rl_free, &buf->rb_send_bufs); |
963 | } | |
964 | ||
965 | INIT_LIST_HEAD(&buf->rb_recv_bufs); | |
05c97466 | 966 | for (i = 0; i < buf->rb_max_requests + RPCRDMA_MAX_BC_REQUESTS; i++) { |
1e465fd4 | 967 | struct rpcrdma_rep *rep; |
c56c65fb | 968 | |
1392402c CL |
969 | rep = rpcrdma_create_rep(r_xprt); |
970 | if (IS_ERR(rep)) { | |
c56c65fb TT |
971 | dprintk("RPC: %s: reply buffer %d alloc failed\n", |
972 | __func__, i); | |
1392402c | 973 | rc = PTR_ERR(rep); |
c56c65fb TT |
974 | goto out; |
975 | } | |
1e465fd4 | 976 | list_add(&rep->rr_list, &buf->rb_recv_bufs); |
c56c65fb | 977 | } |
1392402c | 978 | |
c56c65fb TT |
979 | return 0; |
980 | out: | |
981 | rpcrdma_buffer_destroy(buf); | |
982 | return rc; | |
983 | } | |
984 | ||
1e465fd4 CL |
985 | static struct rpcrdma_req * |
986 | rpcrdma_buffer_get_req_locked(struct rpcrdma_buffer *buf) | |
987 | { | |
988 | struct rpcrdma_req *req; | |
989 | ||
990 | req = list_first_entry(&buf->rb_send_bufs, | |
991 | struct rpcrdma_req, rl_free); | |
992 | list_del(&req->rl_free); | |
993 | return req; | |
994 | } | |
995 | ||
996 | static struct rpcrdma_rep * | |
997 | rpcrdma_buffer_get_rep_locked(struct rpcrdma_buffer *buf) | |
998 | { | |
999 | struct rpcrdma_rep *rep; | |
1000 | ||
1001 | rep = list_first_entry(&buf->rb_recv_bufs, | |
1002 | struct rpcrdma_rep, rr_list); | |
1003 | list_del(&rep->rr_list); | |
1004 | return rep; | |
1005 | } | |
1006 | ||
1392402c | 1007 | static void |
13650c23 | 1008 | rpcrdma_destroy_rep(struct rpcrdma_rep *rep) |
1392402c | 1009 | { |
13650c23 | 1010 | rpcrdma_free_regbuf(rep->rr_rdmabuf); |
1392402c CL |
1011 | kfree(rep); |
1012 | } | |
1013 | ||
f531a5db | 1014 | void |
13650c23 | 1015 | rpcrdma_destroy_req(struct rpcrdma_req *req) |
1392402c | 1016 | { |
13650c23 CL |
1017 | rpcrdma_free_regbuf(req->rl_recvbuf); |
1018 | rpcrdma_free_regbuf(req->rl_sendbuf); | |
1019 | rpcrdma_free_regbuf(req->rl_rdmabuf); | |
1392402c CL |
1020 | kfree(req); |
1021 | } | |
1022 | ||
e2ac236c CL |
1023 | static void |
1024 | rpcrdma_destroy_mrs(struct rpcrdma_buffer *buf) | |
1025 | { | |
1026 | struct rpcrdma_xprt *r_xprt = container_of(buf, struct rpcrdma_xprt, | |
1027 | rx_buf); | |
1028 | struct rpcrdma_ia *ia = rdmab_to_ia(buf); | |
1029 | struct rpcrdma_mw *mw; | |
1030 | unsigned int count; | |
1031 | ||
1032 | count = 0; | |
1033 | spin_lock(&buf->rb_mwlock); | |
1034 | while (!list_empty(&buf->rb_all)) { | |
1035 | mw = list_entry(buf->rb_all.next, struct rpcrdma_mw, mw_all); | |
1036 | list_del(&mw->mw_all); | |
1037 | ||
1038 | spin_unlock(&buf->rb_mwlock); | |
1039 | ia->ri_ops->ro_release_mr(mw); | |
1040 | count++; | |
1041 | spin_lock(&buf->rb_mwlock); | |
1042 | } | |
1043 | spin_unlock(&buf->rb_mwlock); | |
1044 | r_xprt->rx_stats.mrs_allocated = 0; | |
1045 | ||
1046 | dprintk("RPC: %s: released %u MRs\n", __func__, count); | |
1047 | } | |
1048 | ||
c56c65fb TT |
1049 | void |
1050 | rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf) | |
1051 | { | |
505bbe64 CL |
1052 | cancel_delayed_work_sync(&buf->rb_recovery_worker); |
1053 | ||
1e465fd4 CL |
1054 | while (!list_empty(&buf->rb_recv_bufs)) { |
1055 | struct rpcrdma_rep *rep; | |
c56c65fb | 1056 | |
1e465fd4 | 1057 | rep = rpcrdma_buffer_get_rep_locked(buf); |
13650c23 | 1058 | rpcrdma_destroy_rep(rep); |
c56c65fb | 1059 | } |
05c97466 | 1060 | buf->rb_send_count = 0; |
c56c65fb | 1061 | |
f531a5db CL |
1062 | spin_lock(&buf->rb_reqslock); |
1063 | while (!list_empty(&buf->rb_allreqs)) { | |
1e465fd4 | 1064 | struct rpcrdma_req *req; |
4034ba04 | 1065 | |
f531a5db CL |
1066 | req = list_first_entry(&buf->rb_allreqs, |
1067 | struct rpcrdma_req, rl_all); | |
1068 | list_del(&req->rl_all); | |
1069 | ||
1070 | spin_unlock(&buf->rb_reqslock); | |
13650c23 | 1071 | rpcrdma_destroy_req(req); |
f531a5db | 1072 | spin_lock(&buf->rb_reqslock); |
1e465fd4 | 1073 | } |
f531a5db | 1074 | spin_unlock(&buf->rb_reqslock); |
05c97466 | 1075 | buf->rb_recv_count = 0; |
4034ba04 | 1076 | |
e2ac236c | 1077 | rpcrdma_destroy_mrs(buf); |
c56c65fb TT |
1078 | } |
1079 | ||
346aa66b CL |
1080 | struct rpcrdma_mw * |
1081 | rpcrdma_get_mw(struct rpcrdma_xprt *r_xprt) | |
c2922c02 | 1082 | { |
346aa66b CL |
1083 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; |
1084 | struct rpcrdma_mw *mw = NULL; | |
346aa66b | 1085 | |
58d1dcf5 | 1086 | spin_lock(&buf->rb_mwlock); |
346aa66b CL |
1087 | if (!list_empty(&buf->rb_mws)) { |
1088 | mw = list_first_entry(&buf->rb_mws, | |
1089 | struct rpcrdma_mw, mw_list); | |
1090 | list_del_init(&mw->mw_list); | |
c2922c02 | 1091 | } |
58d1dcf5 | 1092 | spin_unlock(&buf->rb_mwlock); |
346aa66b CL |
1093 | |
1094 | if (!mw) | |
e2ac236c | 1095 | goto out_nomws; |
346aa66b | 1096 | return mw; |
e2ac236c CL |
1097 | |
1098 | out_nomws: | |
1099 | dprintk("RPC: %s: no MWs available\n", __func__); | |
1100 | schedule_delayed_work(&buf->rb_refresh_worker, 0); | |
1101 | ||
1102 | /* Allow the reply handler and refresh worker to run */ | |
1103 | cond_resched(); | |
1104 | ||
1105 | return NULL; | |
c2922c02 CL |
1106 | } |
1107 | ||
346aa66b CL |
1108 | void |
1109 | rpcrdma_put_mw(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mw *mw) | |
c2922c02 | 1110 | { |
346aa66b | 1111 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; |
c2922c02 | 1112 | |
58d1dcf5 | 1113 | spin_lock(&buf->rb_mwlock); |
346aa66b | 1114 | list_add_tail(&mw->mw_list, &buf->rb_mws); |
58d1dcf5 | 1115 | spin_unlock(&buf->rb_mwlock); |
c2922c02 CL |
1116 | } |
1117 | ||
05c97466 CL |
1118 | static struct rpcrdma_rep * |
1119 | rpcrdma_buffer_get_rep(struct rpcrdma_buffer *buffers) | |
1120 | { | |
1121 | /* If an RPC previously completed without a reply (say, a | |
1122 | * credential problem or a soft timeout occurs) then hold off | |
1123 | * on supplying more Receive buffers until the number of new | |
1124 | * pending RPCs catches up to the number of posted Receives. | |
1125 | */ | |
1126 | if (unlikely(buffers->rb_send_count < buffers->rb_recv_count)) | |
1127 | return NULL; | |
1128 | ||
1129 | if (unlikely(list_empty(&buffers->rb_recv_bufs))) | |
1130 | return NULL; | |
1131 | buffers->rb_recv_count++; | |
1132 | return rpcrdma_buffer_get_rep_locked(buffers); | |
1133 | } | |
1134 | ||
c56c65fb TT |
1135 | /* |
1136 | * Get a set of request/reply buffers. | |
78d506e1 CL |
1137 | * |
1138 | * Reply buffer (if available) is attached to send buffer upon return. | |
c56c65fb TT |
1139 | */ |
1140 | struct rpcrdma_req * | |
1141 | rpcrdma_buffer_get(struct rpcrdma_buffer *buffers) | |
1142 | { | |
1143 | struct rpcrdma_req *req; | |
c14d86e5 | 1144 | |
a5b027e1 | 1145 | spin_lock(&buffers->rb_lock); |
1e465fd4 CL |
1146 | if (list_empty(&buffers->rb_send_bufs)) |
1147 | goto out_reqbuf; | |
05c97466 | 1148 | buffers->rb_send_count++; |
1e465fd4 | 1149 | req = rpcrdma_buffer_get_req_locked(buffers); |
05c97466 | 1150 | req->rl_reply = rpcrdma_buffer_get_rep(buffers); |
a5b027e1 | 1151 | spin_unlock(&buffers->rb_lock); |
1e465fd4 | 1152 | return req; |
ddb6bebc | 1153 | |
1e465fd4 | 1154 | out_reqbuf: |
a5b027e1 | 1155 | spin_unlock(&buffers->rb_lock); |
78d506e1 | 1156 | pr_warn("RPC: %s: out of request buffers\n", __func__); |
1e465fd4 | 1157 | return NULL; |
c56c65fb TT |
1158 | } |
1159 | ||
1160 | /* | |
1161 | * Put request/reply buffers back into pool. | |
1162 | * Pre-decrement counter/array index. | |
1163 | */ | |
1164 | void | |
1165 | rpcrdma_buffer_put(struct rpcrdma_req *req) | |
1166 | { | |
1167 | struct rpcrdma_buffer *buffers = req->rl_buffer; | |
1e465fd4 | 1168 | struct rpcrdma_rep *rep = req->rl_reply; |
c56c65fb | 1169 | |
90aab602 | 1170 | req->rl_send_wr.num_sge = 0; |
1e465fd4 CL |
1171 | req->rl_reply = NULL; |
1172 | ||
a5b027e1 | 1173 | spin_lock(&buffers->rb_lock); |
05c97466 | 1174 | buffers->rb_send_count--; |
1e465fd4 | 1175 | list_add_tail(&req->rl_free, &buffers->rb_send_bufs); |
05c97466 CL |
1176 | if (rep) { |
1177 | buffers->rb_recv_count--; | |
1e465fd4 | 1178 | list_add_tail(&rep->rr_list, &buffers->rb_recv_bufs); |
05c97466 | 1179 | } |
a5b027e1 | 1180 | spin_unlock(&buffers->rb_lock); |
c56c65fb TT |
1181 | } |
1182 | ||
1183 | /* | |
1184 | * Recover reply buffers from pool. | |
1e465fd4 | 1185 | * This happens when recovering from disconnect. |
c56c65fb TT |
1186 | */ |
1187 | void | |
1188 | rpcrdma_recv_buffer_get(struct rpcrdma_req *req) | |
1189 | { | |
1190 | struct rpcrdma_buffer *buffers = req->rl_buffer; | |
c56c65fb | 1191 | |
a5b027e1 | 1192 | spin_lock(&buffers->rb_lock); |
05c97466 | 1193 | req->rl_reply = rpcrdma_buffer_get_rep(buffers); |
a5b027e1 | 1194 | spin_unlock(&buffers->rb_lock); |
c56c65fb TT |
1195 | } |
1196 | ||
1197 | /* | |
1198 | * Put reply buffers back into pool when not attached to | |
b45ccfd2 | 1199 | * request. This happens in error conditions. |
c56c65fb TT |
1200 | */ |
1201 | void | |
1202 | rpcrdma_recv_buffer_put(struct rpcrdma_rep *rep) | |
1203 | { | |
fed171b3 | 1204 | struct rpcrdma_buffer *buffers = &rep->rr_rxprt->rx_buf; |
c56c65fb | 1205 | |
a5b027e1 | 1206 | spin_lock(&buffers->rb_lock); |
05c97466 | 1207 | buffers->rb_recv_count--; |
1e465fd4 | 1208 | list_add_tail(&rep->rr_list, &buffers->rb_recv_bufs); |
a5b027e1 | 1209 | spin_unlock(&buffers->rb_lock); |
c56c65fb TT |
1210 | } |
1211 | ||
9128c3e7 | 1212 | /** |
99ef4db3 | 1213 | * rpcrdma_alloc_regbuf - allocate and DMA-map memory for SEND/RECV buffers |
9128c3e7 | 1214 | * @size: size of buffer to be allocated, in bytes |
99ef4db3 | 1215 | * @direction: direction of data movement |
9128c3e7 CL |
1216 | * @flags: GFP flags |
1217 | * | |
54cbd6b0 CL |
1218 | * Returns an ERR_PTR, or a pointer to a regbuf, a buffer that |
1219 | * can be persistently DMA-mapped for I/O. | |
9128c3e7 CL |
1220 | * |
1221 | * xprtrdma uses a regbuf for posting an outgoing RDMA SEND, or for | |
99ef4db3 CL |
1222 | * receiving the payload of RDMA RECV operations. During Long Calls |
1223 | * or Replies they may be registered externally via ro_map. | |
9128c3e7 CL |
1224 | */ |
1225 | struct rpcrdma_regbuf * | |
13650c23 CL |
1226 | rpcrdma_alloc_regbuf(size_t size, enum dma_data_direction direction, |
1227 | gfp_t flags) | |
9128c3e7 CL |
1228 | { |
1229 | struct rpcrdma_regbuf *rb; | |
9128c3e7 | 1230 | |
9128c3e7 CL |
1231 | rb = kmalloc(sizeof(*rb) + size, flags); |
1232 | if (rb == NULL) | |
54cbd6b0 | 1233 | return ERR_PTR(-ENOMEM); |
9128c3e7 | 1234 | |
54cbd6b0 | 1235 | rb->rg_device = NULL; |
99ef4db3 | 1236 | rb->rg_direction = direction; |
54cbd6b0 | 1237 | rb->rg_iov.length = size; |
9128c3e7 CL |
1238 | |
1239 | return rb; | |
54cbd6b0 | 1240 | } |
9128c3e7 | 1241 | |
54cbd6b0 CL |
1242 | /** |
1243 | * __rpcrdma_map_regbuf - DMA-map a regbuf | |
1244 | * @ia: controlling rpcrdma_ia | |
1245 | * @rb: regbuf to be mapped | |
1246 | */ | |
1247 | bool | |
1248 | __rpcrdma_dma_map_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb) | |
1249 | { | |
1250 | if (rb->rg_direction == DMA_NONE) | |
1251 | return false; | |
1252 | ||
1253 | rb->rg_iov.addr = ib_dma_map_single(ia->ri_device, | |
1254 | (void *)rb->rg_base, | |
1255 | rdmab_length(rb), | |
1256 | rb->rg_direction); | |
1257 | if (ib_dma_mapping_error(ia->ri_device, rdmab_addr(rb))) | |
1258 | return false; | |
1259 | ||
1260 | rb->rg_device = ia->ri_device; | |
1261 | rb->rg_iov.lkey = ia->ri_pd->local_dma_lkey; | |
1262 | return true; | |
1263 | } | |
1264 | ||
1265 | static void | |
1266 | rpcrdma_dma_unmap_regbuf(struct rpcrdma_regbuf *rb) | |
1267 | { | |
1268 | if (!rpcrdma_regbuf_is_mapped(rb)) | |
1269 | return; | |
1270 | ||
1271 | ib_dma_unmap_single(rb->rg_device, rdmab_addr(rb), | |
1272 | rdmab_length(rb), rb->rg_direction); | |
1273 | rb->rg_device = NULL; | |
9128c3e7 CL |
1274 | } |
1275 | ||
1276 | /** | |
1277 | * rpcrdma_free_regbuf - deregister and free registered buffer | |
9128c3e7 CL |
1278 | * @rb: regbuf to be deregistered and freed |
1279 | */ | |
1280 | void | |
13650c23 | 1281 | rpcrdma_free_regbuf(struct rpcrdma_regbuf *rb) |
9128c3e7 | 1282 | { |
e531dcab CL |
1283 | if (!rb) |
1284 | return; | |
1285 | ||
54cbd6b0 | 1286 | rpcrdma_dma_unmap_regbuf(rb); |
e531dcab | 1287 | kfree(rb); |
9128c3e7 CL |
1288 | } |
1289 | ||
c56c65fb TT |
1290 | /* |
1291 | * Prepost any receive buffer, then post send. | |
1292 | * | |
1293 | * Receive buffer is donated to hardware, reclaimed upon recv completion. | |
1294 | */ | |
1295 | int | |
1296 | rpcrdma_ep_post(struct rpcrdma_ia *ia, | |
1297 | struct rpcrdma_ep *ep, | |
1298 | struct rpcrdma_req *req) | |
1299 | { | |
90aab602 CL |
1300 | struct ib_send_wr *send_wr = &req->rl_send_wr; |
1301 | struct ib_send_wr *send_wr_fail; | |
655fec69 | 1302 | int rc; |
c56c65fb | 1303 | |
90aab602 CL |
1304 | if (req->rl_reply) { |
1305 | rc = rpcrdma_ep_post_recv(ia, req->rl_reply); | |
c56c65fb | 1306 | if (rc) |
7a89f9c6 | 1307 | return rc; |
c56c65fb TT |
1308 | req->rl_reply = NULL; |
1309 | } | |
1310 | ||
b3221d6a | 1311 | dprintk("RPC: %s: posting %d s/g entries\n", |
90aab602 | 1312 | __func__, send_wr->num_sge); |
c56c65fb TT |
1313 | |
1314 | if (DECR_CQCOUNT(ep) > 0) | |
90aab602 | 1315 | send_wr->send_flags = 0; |
c56c65fb TT |
1316 | else { /* Provider must take a send completion every now and then */ |
1317 | INIT_CQCOUNT(ep); | |
90aab602 | 1318 | send_wr->send_flags = IB_SEND_SIGNALED; |
c56c65fb TT |
1319 | } |
1320 | ||
90aab602 | 1321 | rc = ib_post_send(ia->ri_id->qp, send_wr, &send_wr_fail); |
c56c65fb | 1322 | if (rc) |
7a89f9c6 CL |
1323 | goto out_postsend_err; |
1324 | return 0; | |
1325 | ||
1326 | out_postsend_err: | |
1327 | pr_err("rpcrdma: RDMA Send ib_post_send returned %i\n", rc); | |
1328 | return -ENOTCONN; | |
c56c65fb TT |
1329 | } |
1330 | ||
c56c65fb TT |
1331 | int |
1332 | rpcrdma_ep_post_recv(struct rpcrdma_ia *ia, | |
c56c65fb TT |
1333 | struct rpcrdma_rep *rep) |
1334 | { | |
6ea8e711 | 1335 | struct ib_recv_wr *recv_wr_fail; |
c56c65fb TT |
1336 | int rc; |
1337 | ||
54cbd6b0 CL |
1338 | if (!rpcrdma_dma_map_regbuf(ia, rep->rr_rdmabuf)) |
1339 | goto out_map; | |
6ea8e711 | 1340 | rc = ib_post_recv(ia->ri_id->qp, &rep->rr_recv_wr, &recv_wr_fail); |
c56c65fb | 1341 | if (rc) |
7a89f9c6 CL |
1342 | goto out_postrecv; |
1343 | return 0; | |
1344 | ||
54cbd6b0 CL |
1345 | out_map: |
1346 | pr_err("rpcrdma: failed to DMA map the Receive buffer\n"); | |
1347 | return -EIO; | |
1348 | ||
7a89f9c6 CL |
1349 | out_postrecv: |
1350 | pr_err("rpcrdma: ib_post_recv returned %i\n", rc); | |
1351 | return -ENOTCONN; | |
c56c65fb | 1352 | } |
43e95988 | 1353 | |
f531a5db CL |
1354 | /** |
1355 | * rpcrdma_ep_post_extra_recv - Post buffers for incoming backchannel requests | |
1356 | * @r_xprt: transport associated with these backchannel resources | |
1357 | * @min_reqs: minimum number of incoming requests expected | |
1358 | * | |
1359 | * Returns zero if all requested buffers were posted, or a negative errno. | |
1360 | */ | |
1361 | int | |
1362 | rpcrdma_ep_post_extra_recv(struct rpcrdma_xprt *r_xprt, unsigned int count) | |
1363 | { | |
1364 | struct rpcrdma_buffer *buffers = &r_xprt->rx_buf; | |
1365 | struct rpcrdma_ia *ia = &r_xprt->rx_ia; | |
f531a5db | 1366 | struct rpcrdma_rep *rep; |
f531a5db CL |
1367 | int rc; |
1368 | ||
1369 | while (count--) { | |
9b06688b | 1370 | spin_lock(&buffers->rb_lock); |
f531a5db CL |
1371 | if (list_empty(&buffers->rb_recv_bufs)) |
1372 | goto out_reqbuf; | |
1373 | rep = rpcrdma_buffer_get_rep_locked(buffers); | |
9b06688b | 1374 | spin_unlock(&buffers->rb_lock); |
f531a5db | 1375 | |
b157380a | 1376 | rc = rpcrdma_ep_post_recv(ia, rep); |
f531a5db CL |
1377 | if (rc) |
1378 | goto out_rc; | |
1379 | } | |
1380 | ||
1381 | return 0; | |
1382 | ||
1383 | out_reqbuf: | |
9b06688b | 1384 | spin_unlock(&buffers->rb_lock); |
f531a5db CL |
1385 | pr_warn("%s: no extra receive buffers\n", __func__); |
1386 | return -ENOMEM; | |
1387 | ||
1388 | out_rc: | |
1389 | rpcrdma_recv_buffer_put(rep); | |
1390 | return rc; | |
1391 | } |