Commit | Line | Data |
---|---|---|
377f9b2f | 1 | /* |
0bf48289 | 2 | * Copyright (c) 2014 Open Grid Computing, Inc. All rights reserved. |
377f9b2f TT |
3 | * Copyright (c) 2005-2007 Network Appliance, Inc. All rights reserved. |
4 | * | |
5 | * This software is available to you under a choice of one of two | |
6 | * licenses. You may choose to be licensed under the terms of the GNU | |
7 | * General Public License (GPL) Version 2, available from the file | |
8 | * COPYING in the main directory of this source tree, or the BSD-type | |
9 | * license below: | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * | |
15 | * Redistributions of source code must retain the above copyright | |
16 | * notice, this list of conditions and the following disclaimer. | |
17 | * | |
18 | * Redistributions in binary form must reproduce the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer in the documentation and/or other materials provided | |
21 | * with the distribution. | |
22 | * | |
23 | * Neither the name of the Network Appliance, Inc. nor the names of | |
24 | * its contributors may be used to endorse or promote products | |
25 | * derived from this software without specific prior written | |
26 | * permission. | |
27 | * | |
28 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
29 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
30 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
31 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
32 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
33 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
34 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
35 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
36 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
37 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
38 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
39 | * | |
40 | * Author: Tom Tucker <tom@opengridcomputing.com> | |
41 | */ | |
42 | ||
43 | #include <linux/sunrpc/svc_xprt.h> | |
44 | #include <linux/sunrpc/debug.h> | |
45 | #include <linux/sunrpc/rpc_rdma.h> | |
a6b7a407 | 46 | #include <linux/interrupt.h> |
d43c36dc | 47 | #include <linux/sched.h> |
5a0e3ad6 | 48 | #include <linux/slab.h> |
377f9b2f | 49 | #include <linux/spinlock.h> |
a25e758c | 50 | #include <linux/workqueue.h> |
377f9b2f TT |
51 | #include <rdma/ib_verbs.h> |
52 | #include <rdma/rdma_cm.h> | |
53 | #include <linux/sunrpc/svc_rdma.h> | |
bc3b2d7f | 54 | #include <linux/export.h> |
cec56c8f | 55 | #include "xprt_rdma.h" |
377f9b2f TT |
56 | |
57 | #define RPCDBG_FACILITY RPCDBG_SVCXPRT | |
58 | ||
59 | static struct svc_xprt *svc_rdma_create(struct svc_serv *serv, | |
62832c03 | 60 | struct net *net, |
377f9b2f TT |
61 | struct sockaddr *sa, int salen, |
62 | int flags); | |
63 | static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt); | |
64 | static void svc_rdma_release_rqst(struct svc_rqst *); | |
377f9b2f TT |
65 | static void dto_tasklet_func(unsigned long data); |
66 | static void svc_rdma_detach(struct svc_xprt *xprt); | |
67 | static void svc_rdma_free(struct svc_xprt *xprt); | |
68 | static int svc_rdma_has_wspace(struct svc_xprt *xprt); | |
16e4d93f | 69 | static int svc_rdma_secure_port(struct svc_rqst *); |
377f9b2f TT |
70 | static void rq_cq_reap(struct svcxprt_rdma *xprt); |
71 | static void sq_cq_reap(struct svcxprt_rdma *xprt); | |
72 | ||
5eaa65b2 | 73 | static DECLARE_TASKLET(dto_tasklet, dto_tasklet_func, 0UL); |
377f9b2f TT |
74 | static DEFINE_SPINLOCK(dto_lock); |
75 | static LIST_HEAD(dto_xprt_q); | |
76 | ||
77 | static struct svc_xprt_ops svc_rdma_ops = { | |
78 | .xpo_create = svc_rdma_create, | |
79 | .xpo_recvfrom = svc_rdma_recvfrom, | |
80 | .xpo_sendto = svc_rdma_sendto, | |
81 | .xpo_release_rqst = svc_rdma_release_rqst, | |
82 | .xpo_detach = svc_rdma_detach, | |
83 | .xpo_free = svc_rdma_free, | |
84 | .xpo_prep_reply_hdr = svc_rdma_prep_reply_hdr, | |
85 | .xpo_has_wspace = svc_rdma_has_wspace, | |
86 | .xpo_accept = svc_rdma_accept, | |
16e4d93f | 87 | .xpo_secure_port = svc_rdma_secure_port, |
377f9b2f TT |
88 | }; |
89 | ||
90 | struct svc_xprt_class svc_rdma_class = { | |
91 | .xcl_name = "rdma", | |
92 | .xcl_owner = THIS_MODULE, | |
93 | .xcl_ops = &svc_rdma_ops, | |
94 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, | |
95 | }; | |
96 | ||
377f9b2f TT |
97 | struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt) |
98 | { | |
99 | struct svc_rdma_op_ctxt *ctxt; | |
100 | ||
101 | while (1) { | |
8948896c TT |
102 | ctxt = kmem_cache_alloc(svc_rdma_ctxt_cachep, GFP_KERNEL); |
103 | if (ctxt) | |
104 | break; | |
105 | schedule_timeout_uninterruptible(msecs_to_jiffies(500)); | |
377f9b2f | 106 | } |
8948896c TT |
107 | ctxt->xprt = xprt; |
108 | INIT_LIST_HEAD(&ctxt->dto_q); | |
109 | ctxt->count = 0; | |
64be8608 | 110 | ctxt->frmr = NULL; |
8948896c | 111 | atomic_inc(&xprt->sc_ctxt_used); |
377f9b2f TT |
112 | return ctxt; |
113 | } | |
114 | ||
146b6df6 | 115 | void svc_rdma_unmap_dma(struct svc_rdma_op_ctxt *ctxt) |
e6ab9143 TT |
116 | { |
117 | struct svcxprt_rdma *xprt = ctxt->xprt; | |
118 | int i; | |
119 | for (i = 0; i < ctxt->count && ctxt->sge[i].length; i++) { | |
64be8608 TT |
120 | /* |
121 | * Unmap the DMA addr in the SGE if the lkey matches | |
122 | * the sc_dma_lkey, otherwise, ignore it since it is | |
123 | * an FRMR lkey and will be unmapped later when the | |
124 | * last WR that uses it completes. | |
125 | */ | |
126 | if (ctxt->sge[i].lkey == xprt->sc_dma_lkey) { | |
127 | atomic_dec(&xprt->sc_dma_used); | |
b432e6b3 | 128 | ib_dma_unmap_page(xprt->sc_cm_id->device, |
64be8608 TT |
129 | ctxt->sge[i].addr, |
130 | ctxt->sge[i].length, | |
131 | ctxt->direction); | |
132 | } | |
e6ab9143 TT |
133 | } |
134 | } | |
135 | ||
377f9b2f TT |
136 | void svc_rdma_put_context(struct svc_rdma_op_ctxt *ctxt, int free_pages) |
137 | { | |
138 | struct svcxprt_rdma *xprt; | |
139 | int i; | |
140 | ||
141 | BUG_ON(!ctxt); | |
142 | xprt = ctxt->xprt; | |
143 | if (free_pages) | |
144 | for (i = 0; i < ctxt->count; i++) | |
145 | put_page(ctxt->pages[i]); | |
146 | ||
8948896c | 147 | kmem_cache_free(svc_rdma_ctxt_cachep, ctxt); |
87407673 | 148 | atomic_dec(&xprt->sc_ctxt_used); |
377f9b2f TT |
149 | } |
150 | ||
ab96dddb TT |
151 | /* |
152 | * Temporary NFS req mappings are shared across all transport | |
153 | * instances. These are short lived and should be bounded by the number | |
154 | * of concurrent server threads * depth of the SQ. | |
155 | */ | |
156 | struct svc_rdma_req_map *svc_rdma_get_req_map(void) | |
157 | { | |
158 | struct svc_rdma_req_map *map; | |
159 | while (1) { | |
160 | map = kmem_cache_alloc(svc_rdma_map_cachep, GFP_KERNEL); | |
161 | if (map) | |
162 | break; | |
163 | schedule_timeout_uninterruptible(msecs_to_jiffies(500)); | |
164 | } | |
165 | map->count = 0; | |
166 | return map; | |
167 | } | |
168 | ||
169 | void svc_rdma_put_req_map(struct svc_rdma_req_map *map) | |
170 | { | |
171 | kmem_cache_free(svc_rdma_map_cachep, map); | |
172 | } | |
173 | ||
377f9b2f TT |
174 | /* ib_cq event handler */ |
175 | static void cq_event_handler(struct ib_event *event, void *context) | |
176 | { | |
177 | struct svc_xprt *xprt = context; | |
178 | dprintk("svcrdma: received CQ event id=%d, context=%p\n", | |
179 | event->event, context); | |
180 | set_bit(XPT_CLOSE, &xprt->xpt_flags); | |
181 | } | |
182 | ||
183 | /* QP event handler */ | |
184 | static void qp_event_handler(struct ib_event *event, void *context) | |
185 | { | |
186 | struct svc_xprt *xprt = context; | |
187 | ||
188 | switch (event->event) { | |
189 | /* These are considered benign events */ | |
190 | case IB_EVENT_PATH_MIG: | |
191 | case IB_EVENT_COMM_EST: | |
192 | case IB_EVENT_SQ_DRAINED: | |
193 | case IB_EVENT_QP_LAST_WQE_REACHED: | |
194 | dprintk("svcrdma: QP event %d received for QP=%p\n", | |
195 | event->event, event->element.qp); | |
196 | break; | |
197 | /* These are considered fatal events */ | |
198 | case IB_EVENT_PATH_MIG_ERR: | |
199 | case IB_EVENT_QP_FATAL: | |
200 | case IB_EVENT_QP_REQ_ERR: | |
201 | case IB_EVENT_QP_ACCESS_ERR: | |
202 | case IB_EVENT_DEVICE_FATAL: | |
203 | default: | |
204 | dprintk("svcrdma: QP ERROR event %d received for QP=%p, " | |
205 | "closing transport\n", | |
206 | event->event, event->element.qp); | |
207 | set_bit(XPT_CLOSE, &xprt->xpt_flags); | |
208 | break; | |
209 | } | |
210 | } | |
211 | ||
212 | /* | |
213 | * Data Transfer Operation Tasklet | |
214 | * | |
215 | * Walks a list of transports with I/O pending, removing entries as | |
216 | * they are added to the server's I/O pending list. Two bits indicate | |
217 | * if SQ, RQ, or both have I/O pending. The dto_lock is an irqsave | |
218 | * spinlock that serializes access to the transport list with the RQ | |
219 | * and SQ interrupt handlers. | |
220 | */ | |
221 | static void dto_tasklet_func(unsigned long data) | |
222 | { | |
223 | struct svcxprt_rdma *xprt; | |
224 | unsigned long flags; | |
225 | ||
226 | spin_lock_irqsave(&dto_lock, flags); | |
227 | while (!list_empty(&dto_xprt_q)) { | |
228 | xprt = list_entry(dto_xprt_q.next, | |
229 | struct svcxprt_rdma, sc_dto_q); | |
230 | list_del_init(&xprt->sc_dto_q); | |
231 | spin_unlock_irqrestore(&dto_lock, flags); | |
232 | ||
dbcd00eb TT |
233 | rq_cq_reap(xprt); |
234 | sq_cq_reap(xprt); | |
377f9b2f | 235 | |
c48cbb40 | 236 | svc_xprt_put(&xprt->sc_xprt); |
377f9b2f TT |
237 | spin_lock_irqsave(&dto_lock, flags); |
238 | } | |
239 | spin_unlock_irqrestore(&dto_lock, flags); | |
240 | } | |
241 | ||
242 | /* | |
243 | * Receive Queue Completion Handler | |
244 | * | |
245 | * Since an RQ completion handler is called on interrupt context, we | |
246 | * need to defer the handling of the I/O to a tasklet | |
247 | */ | |
248 | static void rq_comp_handler(struct ib_cq *cq, void *cq_context) | |
249 | { | |
250 | struct svcxprt_rdma *xprt = cq_context; | |
251 | unsigned long flags; | |
252 | ||
1711386c TT |
253 | /* Guard against unconditional flush call for destroyed QP */ |
254 | if (atomic_read(&xprt->sc_xprt.xpt_ref.refcount)==0) | |
255 | return; | |
256 | ||
377f9b2f TT |
257 | /* |
258 | * Set the bit regardless of whether or not it's on the list | |
259 | * because it may be on the list already due to an SQ | |
260 | * completion. | |
1711386c | 261 | */ |
377f9b2f TT |
262 | set_bit(RDMAXPRT_RQ_PENDING, &xprt->sc_flags); |
263 | ||
264 | /* | |
265 | * If this transport is not already on the DTO transport queue, | |
266 | * add it | |
267 | */ | |
268 | spin_lock_irqsave(&dto_lock, flags); | |
c48cbb40 TT |
269 | if (list_empty(&xprt->sc_dto_q)) { |
270 | svc_xprt_get(&xprt->sc_xprt); | |
377f9b2f | 271 | list_add_tail(&xprt->sc_dto_q, &dto_xprt_q); |
c48cbb40 | 272 | } |
377f9b2f TT |
273 | spin_unlock_irqrestore(&dto_lock, flags); |
274 | ||
275 | /* Tasklet does all the work to avoid irqsave locks. */ | |
276 | tasklet_schedule(&dto_tasklet); | |
277 | } | |
278 | ||
279 | /* | |
280 | * rq_cq_reap - Process the RQ CQ. | |
281 | * | |
282 | * Take all completing WC off the CQE and enqueue the associated DTO | |
283 | * context on the dto_q for the transport. | |
0905c0f0 TT |
284 | * |
285 | * Note that caller must hold a transport reference. | |
377f9b2f TT |
286 | */ |
287 | static void rq_cq_reap(struct svcxprt_rdma *xprt) | |
288 | { | |
289 | int ret; | |
290 | struct ib_wc wc; | |
291 | struct svc_rdma_op_ctxt *ctxt = NULL; | |
292 | ||
dbcd00eb TT |
293 | if (!test_and_clear_bit(RDMAXPRT_RQ_PENDING, &xprt->sc_flags)) |
294 | return; | |
295 | ||
296 | ib_req_notify_cq(xprt->sc_rq_cq, IB_CQ_NEXT_COMP); | |
377f9b2f TT |
297 | atomic_inc(&rdma_stat_rq_poll); |
298 | ||
377f9b2f TT |
299 | while ((ret = ib_poll_cq(xprt->sc_rq_cq, 1, &wc)) > 0) { |
300 | ctxt = (struct svc_rdma_op_ctxt *)(unsigned long)wc.wr_id; | |
301 | ctxt->wc_status = wc.status; | |
302 | ctxt->byte_len = wc.byte_len; | |
e6ab9143 | 303 | svc_rdma_unmap_dma(ctxt); |
377f9b2f TT |
304 | if (wc.status != IB_WC_SUCCESS) { |
305 | /* Close the transport */ | |
0905c0f0 | 306 | dprintk("svcrdma: transport closing putting ctxt %p\n", ctxt); |
377f9b2f TT |
307 | set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags); |
308 | svc_rdma_put_context(ctxt, 1); | |
0905c0f0 | 309 | svc_xprt_put(&xprt->sc_xprt); |
377f9b2f TT |
310 | continue; |
311 | } | |
47698e08 | 312 | spin_lock_bh(&xprt->sc_rq_dto_lock); |
377f9b2f | 313 | list_add_tail(&ctxt->dto_q, &xprt->sc_rq_dto_q); |
47698e08 | 314 | spin_unlock_bh(&xprt->sc_rq_dto_lock); |
0905c0f0 | 315 | svc_xprt_put(&xprt->sc_xprt); |
377f9b2f | 316 | } |
377f9b2f TT |
317 | |
318 | if (ctxt) | |
319 | atomic_inc(&rdma_stat_rq_prod); | |
dbcd00eb TT |
320 | |
321 | set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags); | |
322 | /* | |
323 | * If data arrived before established event, | |
324 | * don't enqueue. This defers RPC I/O until the | |
325 | * RDMA connection is complete. | |
326 | */ | |
327 | if (!test_bit(RDMAXPRT_CONN_PENDING, &xprt->sc_flags)) | |
328 | svc_xprt_enqueue(&xprt->sc_xprt); | |
377f9b2f TT |
329 | } |
330 | ||
e1183210 | 331 | /* |
70f23fd6 | 332 | * Process a completion context |
e1183210 TT |
333 | */ |
334 | static void process_context(struct svcxprt_rdma *xprt, | |
335 | struct svc_rdma_op_ctxt *ctxt) | |
336 | { | |
337 | svc_rdma_unmap_dma(ctxt); | |
338 | ||
339 | switch (ctxt->wr_op) { | |
340 | case IB_WR_SEND: | |
0bf48289 | 341 | BUG_ON(ctxt->frmr); |
e1183210 TT |
342 | svc_rdma_put_context(ctxt, 1); |
343 | break; | |
344 | ||
345 | case IB_WR_RDMA_WRITE: | |
0bf48289 | 346 | BUG_ON(ctxt->frmr); |
e1183210 TT |
347 | svc_rdma_put_context(ctxt, 0); |
348 | break; | |
349 | ||
350 | case IB_WR_RDMA_READ: | |
146b6df6 | 351 | case IB_WR_RDMA_READ_WITH_INV: |
0bf48289 | 352 | svc_rdma_put_frmr(xprt, ctxt->frmr); |
e1183210 TT |
353 | if (test_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags)) { |
354 | struct svc_rdma_op_ctxt *read_hdr = ctxt->read_hdr; | |
355 | BUG_ON(!read_hdr); | |
356 | spin_lock_bh(&xprt->sc_rq_dto_lock); | |
357 | set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags); | |
358 | list_add_tail(&read_hdr->dto_q, | |
359 | &xprt->sc_read_complete_q); | |
360 | spin_unlock_bh(&xprt->sc_rq_dto_lock); | |
361 | svc_xprt_enqueue(&xprt->sc_xprt); | |
362 | } | |
363 | svc_rdma_put_context(ctxt, 0); | |
364 | break; | |
365 | ||
366 | default: | |
0bf48289 | 367 | BUG_ON(1); |
e1183210 TT |
368 | printk(KERN_ERR "svcrdma: unexpected completion type, " |
369 | "opcode=%d\n", | |
370 | ctxt->wr_op); | |
371 | break; | |
372 | } | |
373 | } | |
374 | ||
377f9b2f TT |
375 | /* |
376 | * Send Queue Completion Handler - potentially called on interrupt context. | |
0905c0f0 TT |
377 | * |
378 | * Note that caller must hold a transport reference. | |
377f9b2f TT |
379 | */ |
380 | static void sq_cq_reap(struct svcxprt_rdma *xprt) | |
381 | { | |
382 | struct svc_rdma_op_ctxt *ctxt = NULL; | |
0bf48289 SW |
383 | struct ib_wc wc_a[6]; |
384 | struct ib_wc *wc; | |
377f9b2f TT |
385 | struct ib_cq *cq = xprt->sc_sq_cq; |
386 | int ret; | |
387 | ||
0bf48289 SW |
388 | memset(wc_a, 0, sizeof(wc_a)); |
389 | ||
dbcd00eb TT |
390 | if (!test_and_clear_bit(RDMAXPRT_SQ_PENDING, &xprt->sc_flags)) |
391 | return; | |
392 | ||
393 | ib_req_notify_cq(xprt->sc_sq_cq, IB_CQ_NEXT_COMP); | |
377f9b2f | 394 | atomic_inc(&rdma_stat_sq_poll); |
0bf48289 SW |
395 | while ((ret = ib_poll_cq(cq, ARRAY_SIZE(wc_a), wc_a)) > 0) { |
396 | int i; | |
377f9b2f | 397 | |
0bf48289 SW |
398 | for (i = 0; i < ret; i++) { |
399 | wc = &wc_a[i]; | |
400 | if (wc->status != IB_WC_SUCCESS) { | |
401 | dprintk("svcrdma: sq wc err status %d\n", | |
402 | wc->status); | |
377f9b2f | 403 | |
0bf48289 SW |
404 | /* Close the transport */ |
405 | set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags); | |
406 | } | |
377f9b2f | 407 | |
0bf48289 SW |
408 | /* Decrement used SQ WR count */ |
409 | atomic_dec(&xprt->sc_sq_count); | |
410 | wake_up(&xprt->sc_send_wait); | |
411 | ||
412 | ctxt = (struct svc_rdma_op_ctxt *) | |
413 | (unsigned long)wc->wr_id; | |
414 | if (ctxt) | |
415 | process_context(xprt, ctxt); | |
416 | ||
417 | svc_xprt_put(&xprt->sc_xprt); | |
418 | } | |
377f9b2f TT |
419 | } |
420 | ||
421 | if (ctxt) | |
422 | atomic_inc(&rdma_stat_sq_prod); | |
423 | } | |
424 | ||
425 | static void sq_comp_handler(struct ib_cq *cq, void *cq_context) | |
426 | { | |
427 | struct svcxprt_rdma *xprt = cq_context; | |
428 | unsigned long flags; | |
429 | ||
1711386c TT |
430 | /* Guard against unconditional flush call for destroyed QP */ |
431 | if (atomic_read(&xprt->sc_xprt.xpt_ref.refcount)==0) | |
432 | return; | |
433 | ||
377f9b2f TT |
434 | /* |
435 | * Set the bit regardless of whether or not it's on the list | |
436 | * because it may be on the list already due to an RQ | |
437 | * completion. | |
1711386c | 438 | */ |
377f9b2f TT |
439 | set_bit(RDMAXPRT_SQ_PENDING, &xprt->sc_flags); |
440 | ||
441 | /* | |
442 | * If this transport is not already on the DTO transport queue, | |
443 | * add it | |
444 | */ | |
445 | spin_lock_irqsave(&dto_lock, flags); | |
c48cbb40 TT |
446 | if (list_empty(&xprt->sc_dto_q)) { |
447 | svc_xprt_get(&xprt->sc_xprt); | |
377f9b2f | 448 | list_add_tail(&xprt->sc_dto_q, &dto_xprt_q); |
c48cbb40 | 449 | } |
377f9b2f TT |
450 | spin_unlock_irqrestore(&dto_lock, flags); |
451 | ||
452 | /* Tasklet does all the work to avoid irqsave locks. */ | |
453 | tasklet_schedule(&dto_tasklet); | |
454 | } | |
455 | ||
377f9b2f TT |
456 | static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *serv, |
457 | int listener) | |
458 | { | |
459 | struct svcxprt_rdma *cma_xprt = kzalloc(sizeof *cma_xprt, GFP_KERNEL); | |
460 | ||
461 | if (!cma_xprt) | |
462 | return NULL; | |
bd4620dd | 463 | svc_xprt_init(&init_net, &svc_rdma_class, &cma_xprt->sc_xprt, serv); |
377f9b2f TT |
464 | INIT_LIST_HEAD(&cma_xprt->sc_accept_q); |
465 | INIT_LIST_HEAD(&cma_xprt->sc_dto_q); | |
466 | INIT_LIST_HEAD(&cma_xprt->sc_rq_dto_q); | |
467 | INIT_LIST_HEAD(&cma_xprt->sc_read_complete_q); | |
64be8608 | 468 | INIT_LIST_HEAD(&cma_xprt->sc_frmr_q); |
377f9b2f TT |
469 | init_waitqueue_head(&cma_xprt->sc_send_wait); |
470 | ||
471 | spin_lock_init(&cma_xprt->sc_lock); | |
377f9b2f | 472 | spin_lock_init(&cma_xprt->sc_rq_dto_lock); |
64be8608 | 473 | spin_lock_init(&cma_xprt->sc_frmr_q_lock); |
377f9b2f TT |
474 | |
475 | cma_xprt->sc_ord = svcrdma_ord; | |
476 | ||
477 | cma_xprt->sc_max_req_size = svcrdma_max_req_size; | |
478 | cma_xprt->sc_max_requests = svcrdma_max_requests; | |
479 | cma_xprt->sc_sq_depth = svcrdma_max_requests * RPCRDMA_SQ_DEPTH_MULT; | |
480 | atomic_set(&cma_xprt->sc_sq_count, 0); | |
87295b6c | 481 | atomic_set(&cma_xprt->sc_ctxt_used, 0); |
377f9b2f | 482 | |
8948896c | 483 | if (listener) |
377f9b2f TT |
484 | set_bit(XPT_LISTENER, &cma_xprt->sc_xprt.xpt_flags); |
485 | ||
486 | return cma_xprt; | |
487 | } | |
488 | ||
489 | struct page *svc_rdma_get_page(void) | |
490 | { | |
491 | struct page *page; | |
492 | ||
493 | while ((page = alloc_page(GFP_KERNEL)) == NULL) { | |
494 | /* If we can't get memory, wait a bit and try again */ | |
c42a01ee | 495 | printk(KERN_INFO "svcrdma: out of memory...retrying in 1s\n"); |
377f9b2f TT |
496 | schedule_timeout_uninterruptible(msecs_to_jiffies(1000)); |
497 | } | |
498 | return page; | |
499 | } | |
500 | ||
501 | int svc_rdma_post_recv(struct svcxprt_rdma *xprt) | |
502 | { | |
503 | struct ib_recv_wr recv_wr, *bad_recv_wr; | |
504 | struct svc_rdma_op_ctxt *ctxt; | |
505 | struct page *page; | |
a5abf4e8 | 506 | dma_addr_t pa; |
377f9b2f TT |
507 | int sge_no; |
508 | int buflen; | |
509 | int ret; | |
510 | ||
511 | ctxt = svc_rdma_get_context(xprt); | |
512 | buflen = 0; | |
513 | ctxt->direction = DMA_FROM_DEVICE; | |
514 | for (sge_no = 0; buflen < xprt->sc_max_req_size; sge_no++) { | |
515 | BUG_ON(sge_no >= xprt->sc_max_sge); | |
516 | page = svc_rdma_get_page(); | |
517 | ctxt->pages[sge_no] = page; | |
b432e6b3 TT |
518 | pa = ib_dma_map_page(xprt->sc_cm_id->device, |
519 | page, 0, PAGE_SIZE, | |
377f9b2f | 520 | DMA_FROM_DEVICE); |
a5abf4e8 TT |
521 | if (ib_dma_mapping_error(xprt->sc_cm_id->device, pa)) |
522 | goto err_put_ctxt; | |
523 | atomic_inc(&xprt->sc_dma_used); | |
377f9b2f TT |
524 | ctxt->sge[sge_no].addr = pa; |
525 | ctxt->sge[sge_no].length = PAGE_SIZE; | |
a5abf4e8 | 526 | ctxt->sge[sge_no].lkey = xprt->sc_dma_lkey; |
4a84386f | 527 | ctxt->count = sge_no + 1; |
377f9b2f TT |
528 | buflen += PAGE_SIZE; |
529 | } | |
377f9b2f TT |
530 | recv_wr.next = NULL; |
531 | recv_wr.sg_list = &ctxt->sge[0]; | |
532 | recv_wr.num_sge = ctxt->count; | |
533 | recv_wr.wr_id = (u64)(unsigned long)ctxt; | |
534 | ||
0905c0f0 | 535 | svc_xprt_get(&xprt->sc_xprt); |
377f9b2f | 536 | ret = ib_post_recv(xprt->sc_qp, &recv_wr, &bad_recv_wr); |
0905c0f0 | 537 | if (ret) { |
21515e46 | 538 | svc_rdma_unmap_dma(ctxt); |
05a0826a | 539 | svc_rdma_put_context(ctxt, 1); |
21515e46 | 540 | svc_xprt_put(&xprt->sc_xprt); |
0905c0f0 | 541 | } |
377f9b2f | 542 | return ret; |
a5abf4e8 TT |
543 | |
544 | err_put_ctxt: | |
4a84386f | 545 | svc_rdma_unmap_dma(ctxt); |
a5abf4e8 TT |
546 | svc_rdma_put_context(ctxt, 1); |
547 | return -ENOMEM; | |
377f9b2f TT |
548 | } |
549 | ||
550 | /* | |
551 | * This function handles the CONNECT_REQUEST event on a listening | |
552 | * endpoint. It is passed the cma_id for the _new_ connection. The context in | |
553 | * this cma_id is inherited from the listening cma_id and is the svc_xprt | |
554 | * structure for the listening endpoint. | |
555 | * | |
556 | * This function creates a new xprt for the new connection and enqueues it on | |
557 | * the accept queue for the listent xprt. When the listen thread is kicked, it | |
558 | * will call the recvfrom method on the listen xprt which will accept the new | |
559 | * connection. | |
560 | */ | |
36ef25e4 | 561 | static void handle_connect_req(struct rdma_cm_id *new_cma_id, size_t client_ird) |
377f9b2f TT |
562 | { |
563 | struct svcxprt_rdma *listen_xprt = new_cma_id->context; | |
564 | struct svcxprt_rdma *newxprt; | |
af261af4 | 565 | struct sockaddr *sa; |
377f9b2f TT |
566 | |
567 | /* Create a new transport */ | |
568 | newxprt = rdma_create_xprt(listen_xprt->sc_xprt.xpt_server, 0); | |
569 | if (!newxprt) { | |
570 | dprintk("svcrdma: failed to create new transport\n"); | |
571 | return; | |
572 | } | |
573 | newxprt->sc_cm_id = new_cma_id; | |
574 | new_cma_id->context = newxprt; | |
575 | dprintk("svcrdma: Creating newxprt=%p, cm_id=%p, listenxprt=%p\n", | |
576 | newxprt, newxprt->sc_cm_id, listen_xprt); | |
577 | ||
36ef25e4 TT |
578 | /* Save client advertised inbound read limit for use later in accept. */ |
579 | newxprt->sc_ord = client_ird; | |
580 | ||
af261af4 TT |
581 | /* Set the local and remote addresses in the transport */ |
582 | sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr; | |
583 | svc_xprt_set_remote(&newxprt->sc_xprt, sa, svc_addr_len(sa)); | |
584 | sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr; | |
585 | svc_xprt_set_local(&newxprt->sc_xprt, sa, svc_addr_len(sa)); | |
586 | ||
377f9b2f TT |
587 | /* |
588 | * Enqueue the new transport on the accept queue of the listening | |
589 | * transport | |
590 | */ | |
591 | spin_lock_bh(&listen_xprt->sc_lock); | |
592 | list_add_tail(&newxprt->sc_accept_q, &listen_xprt->sc_accept_q); | |
593 | spin_unlock_bh(&listen_xprt->sc_lock); | |
594 | ||
377f9b2f TT |
595 | set_bit(XPT_CONN, &listen_xprt->sc_xprt.xpt_flags); |
596 | svc_xprt_enqueue(&listen_xprt->sc_xprt); | |
597 | } | |
598 | ||
599 | /* | |
600 | * Handles events generated on the listening endpoint. These events will be | |
601 | * either be incoming connect requests or adapter removal events. | |
602 | */ | |
603 | static int rdma_listen_handler(struct rdma_cm_id *cma_id, | |
604 | struct rdma_cm_event *event) | |
605 | { | |
606 | struct svcxprt_rdma *xprt = cma_id->context; | |
607 | int ret = 0; | |
608 | ||
609 | switch (event->event) { | |
610 | case RDMA_CM_EVENT_CONNECT_REQUEST: | |
611 | dprintk("svcrdma: Connect request on cma_id=%p, xprt = %p, " | |
612 | "event=%d\n", cma_id, cma_id->context, event->event); | |
36ef25e4 | 613 | handle_connect_req(cma_id, |
67080c82 | 614 | event->param.conn.initiator_depth); |
377f9b2f TT |
615 | break; |
616 | ||
617 | case RDMA_CM_EVENT_ESTABLISHED: | |
618 | /* Accept complete */ | |
619 | dprintk("svcrdma: Connection completed on LISTEN xprt=%p, " | |
620 | "cm_id=%p\n", xprt, cma_id); | |
621 | break; | |
622 | ||
623 | case RDMA_CM_EVENT_DEVICE_REMOVAL: | |
624 | dprintk("svcrdma: Device removal xprt=%p, cm_id=%p\n", | |
625 | xprt, cma_id); | |
626 | if (xprt) | |
627 | set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags); | |
628 | break; | |
629 | ||
630 | default: | |
631 | dprintk("svcrdma: Unexpected event on listening endpoint %p, " | |
632 | "event=%d\n", cma_id, event->event); | |
633 | break; | |
634 | } | |
635 | ||
636 | return ret; | |
637 | } | |
638 | ||
639 | static int rdma_cma_handler(struct rdma_cm_id *cma_id, | |
640 | struct rdma_cm_event *event) | |
641 | { | |
642 | struct svc_xprt *xprt = cma_id->context; | |
643 | struct svcxprt_rdma *rdma = | |
644 | container_of(xprt, struct svcxprt_rdma, sc_xprt); | |
645 | switch (event->event) { | |
646 | case RDMA_CM_EVENT_ESTABLISHED: | |
647 | /* Accept complete */ | |
c48cbb40 | 648 | svc_xprt_get(xprt); |
377f9b2f TT |
649 | dprintk("svcrdma: Connection completed on DTO xprt=%p, " |
650 | "cm_id=%p\n", xprt, cma_id); | |
651 | clear_bit(RDMAXPRT_CONN_PENDING, &rdma->sc_flags); | |
652 | svc_xprt_enqueue(xprt); | |
653 | break; | |
654 | case RDMA_CM_EVENT_DISCONNECTED: | |
655 | dprintk("svcrdma: Disconnect on DTO xprt=%p, cm_id=%p\n", | |
656 | xprt, cma_id); | |
657 | if (xprt) { | |
658 | set_bit(XPT_CLOSE, &xprt->xpt_flags); | |
659 | svc_xprt_enqueue(xprt); | |
120693d1 | 660 | svc_xprt_put(xprt); |
377f9b2f TT |
661 | } |
662 | break; | |
663 | case RDMA_CM_EVENT_DEVICE_REMOVAL: | |
664 | dprintk("svcrdma: Device removal cma_id=%p, xprt = %p, " | |
665 | "event=%d\n", cma_id, xprt, event->event); | |
666 | if (xprt) { | |
667 | set_bit(XPT_CLOSE, &xprt->xpt_flags); | |
668 | svc_xprt_enqueue(xprt); | |
669 | } | |
670 | break; | |
671 | default: | |
672 | dprintk("svcrdma: Unexpected event on DTO endpoint %p, " | |
673 | "event=%d\n", cma_id, event->event); | |
674 | break; | |
675 | } | |
676 | return 0; | |
677 | } | |
678 | ||
679 | /* | |
680 | * Create a listening RDMA service endpoint. | |
681 | */ | |
682 | static struct svc_xprt *svc_rdma_create(struct svc_serv *serv, | |
62832c03 | 683 | struct net *net, |
377f9b2f TT |
684 | struct sockaddr *sa, int salen, |
685 | int flags) | |
686 | { | |
687 | struct rdma_cm_id *listen_id; | |
688 | struct svcxprt_rdma *cma_xprt; | |
689 | struct svc_xprt *xprt; | |
690 | int ret; | |
691 | ||
692 | dprintk("svcrdma: Creating RDMA socket\n"); | |
bade732a TT |
693 | if (sa->sa_family != AF_INET) { |
694 | dprintk("svcrdma: Address family %d is not supported.\n", sa->sa_family); | |
695 | return ERR_PTR(-EAFNOSUPPORT); | |
696 | } | |
377f9b2f TT |
697 | cma_xprt = rdma_create_xprt(serv, 1); |
698 | if (!cma_xprt) | |
58e8f621 | 699 | return ERR_PTR(-ENOMEM); |
377f9b2f TT |
700 | xprt = &cma_xprt->sc_xprt; |
701 | ||
b26f9b99 SH |
702 | listen_id = rdma_create_id(rdma_listen_handler, cma_xprt, RDMA_PS_TCP, |
703 | IB_QPT_RC); | |
377f9b2f | 704 | if (IS_ERR(listen_id)) { |
58e8f621 TT |
705 | ret = PTR_ERR(listen_id); |
706 | dprintk("svcrdma: rdma_create_id failed = %d\n", ret); | |
707 | goto err0; | |
377f9b2f | 708 | } |
58e8f621 | 709 | |
377f9b2f TT |
710 | ret = rdma_bind_addr(listen_id, sa); |
711 | if (ret) { | |
377f9b2f | 712 | dprintk("svcrdma: rdma_bind_addr failed = %d\n", ret); |
58e8f621 | 713 | goto err1; |
377f9b2f TT |
714 | } |
715 | cma_xprt->sc_cm_id = listen_id; | |
716 | ||
717 | ret = rdma_listen(listen_id, RPCRDMA_LISTEN_BACKLOG); | |
718 | if (ret) { | |
377f9b2f | 719 | dprintk("svcrdma: rdma_listen failed = %d\n", ret); |
58e8f621 | 720 | goto err1; |
377f9b2f TT |
721 | } |
722 | ||
723 | /* | |
724 | * We need to use the address from the cm_id in case the | |
725 | * caller specified 0 for the port number. | |
726 | */ | |
727 | sa = (struct sockaddr *)&cma_xprt->sc_cm_id->route.addr.src_addr; | |
728 | svc_xprt_set_local(&cma_xprt->sc_xprt, sa, salen); | |
729 | ||
730 | return &cma_xprt->sc_xprt; | |
58e8f621 TT |
731 | |
732 | err1: | |
733 | rdma_destroy_id(listen_id); | |
734 | err0: | |
735 | kfree(cma_xprt); | |
736 | return ERR_PTR(ret); | |
377f9b2f TT |
737 | } |
738 | ||
64be8608 TT |
739 | static struct svc_rdma_fastreg_mr *rdma_alloc_frmr(struct svcxprt_rdma *xprt) |
740 | { | |
741 | struct ib_mr *mr; | |
742 | struct ib_fast_reg_page_list *pl; | |
743 | struct svc_rdma_fastreg_mr *frmr; | |
744 | ||
745 | frmr = kmalloc(sizeof(*frmr), GFP_KERNEL); | |
746 | if (!frmr) | |
747 | goto err; | |
748 | ||
749 | mr = ib_alloc_fast_reg_mr(xprt->sc_pd, RPCSVC_MAXPAGES); | |
846d8e7c | 750 | if (IS_ERR(mr)) |
64be8608 TT |
751 | goto err_free_frmr; |
752 | ||
753 | pl = ib_alloc_fast_reg_page_list(xprt->sc_cm_id->device, | |
754 | RPCSVC_MAXPAGES); | |
846d8e7c | 755 | if (IS_ERR(pl)) |
64be8608 TT |
756 | goto err_free_mr; |
757 | ||
758 | frmr->mr = mr; | |
759 | frmr->page_list = pl; | |
760 | INIT_LIST_HEAD(&frmr->frmr_list); | |
761 | return frmr; | |
762 | ||
763 | err_free_mr: | |
764 | ib_dereg_mr(mr); | |
765 | err_free_frmr: | |
766 | kfree(frmr); | |
767 | err: | |
768 | return ERR_PTR(-ENOMEM); | |
769 | } | |
770 | ||
771 | static void rdma_dealloc_frmr_q(struct svcxprt_rdma *xprt) | |
772 | { | |
773 | struct svc_rdma_fastreg_mr *frmr; | |
774 | ||
775 | while (!list_empty(&xprt->sc_frmr_q)) { | |
776 | frmr = list_entry(xprt->sc_frmr_q.next, | |
777 | struct svc_rdma_fastreg_mr, frmr_list); | |
778 | list_del_init(&frmr->frmr_list); | |
779 | ib_dereg_mr(frmr->mr); | |
780 | ib_free_fast_reg_page_list(frmr->page_list); | |
781 | kfree(frmr); | |
782 | } | |
783 | } | |
784 | ||
785 | struct svc_rdma_fastreg_mr *svc_rdma_get_frmr(struct svcxprt_rdma *rdma) | |
786 | { | |
787 | struct svc_rdma_fastreg_mr *frmr = NULL; | |
788 | ||
789 | spin_lock_bh(&rdma->sc_frmr_q_lock); | |
790 | if (!list_empty(&rdma->sc_frmr_q)) { | |
791 | frmr = list_entry(rdma->sc_frmr_q.next, | |
792 | struct svc_rdma_fastreg_mr, frmr_list); | |
793 | list_del_init(&frmr->frmr_list); | |
794 | frmr->map_len = 0; | |
795 | frmr->page_list_len = 0; | |
796 | } | |
797 | spin_unlock_bh(&rdma->sc_frmr_q_lock); | |
798 | if (frmr) | |
799 | return frmr; | |
800 | ||
801 | return rdma_alloc_frmr(rdma); | |
802 | } | |
803 | ||
804 | static void frmr_unmap_dma(struct svcxprt_rdma *xprt, | |
805 | struct svc_rdma_fastreg_mr *frmr) | |
806 | { | |
807 | int page_no; | |
808 | for (page_no = 0; page_no < frmr->page_list_len; page_no++) { | |
809 | dma_addr_t addr = frmr->page_list->page_list[page_no]; | |
810 | if (ib_dma_mapping_error(frmr->mr->device, addr)) | |
811 | continue; | |
812 | atomic_dec(&xprt->sc_dma_used); | |
b432e6b3 TT |
813 | ib_dma_unmap_page(frmr->mr->device, addr, PAGE_SIZE, |
814 | frmr->direction); | |
64be8608 TT |
815 | } |
816 | } | |
817 | ||
818 | void svc_rdma_put_frmr(struct svcxprt_rdma *rdma, | |
819 | struct svc_rdma_fastreg_mr *frmr) | |
820 | { | |
821 | if (frmr) { | |
822 | frmr_unmap_dma(rdma, frmr); | |
823 | spin_lock_bh(&rdma->sc_frmr_q_lock); | |
824 | BUG_ON(!list_empty(&frmr->frmr_list)); | |
825 | list_add(&frmr->frmr_list, &rdma->sc_frmr_q); | |
826 | spin_unlock_bh(&rdma->sc_frmr_q_lock); | |
827 | } | |
828 | } | |
829 | ||
377f9b2f TT |
830 | /* |
831 | * This is the xpo_recvfrom function for listening endpoints. Its | |
832 | * purpose is to accept incoming connections. The CMA callback handler | |
833 | * has already created a new transport and attached it to the new CMA | |
834 | * ID. | |
835 | * | |
836 | * There is a queue of pending connections hung on the listening | |
837 | * transport. This queue contains the new svc_xprt structure. This | |
838 | * function takes svc_xprt structures off the accept_q and completes | |
839 | * the connection. | |
840 | */ | |
841 | static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt) | |
842 | { | |
843 | struct svcxprt_rdma *listen_rdma; | |
844 | struct svcxprt_rdma *newxprt = NULL; | |
845 | struct rdma_conn_param conn_param; | |
846 | struct ib_qp_init_attr qp_attr; | |
847 | struct ib_device_attr devattr; | |
ed72b9c6 | 848 | int uninitialized_var(dma_mr_acc); |
3a5c6380 | 849 | int need_dma_mr; |
377f9b2f TT |
850 | int ret; |
851 | int i; | |
852 | ||
853 | listen_rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt); | |
854 | clear_bit(XPT_CONN, &xprt->xpt_flags); | |
855 | /* Get the next entry off the accept list */ | |
856 | spin_lock_bh(&listen_rdma->sc_lock); | |
857 | if (!list_empty(&listen_rdma->sc_accept_q)) { | |
858 | newxprt = list_entry(listen_rdma->sc_accept_q.next, | |
859 | struct svcxprt_rdma, sc_accept_q); | |
860 | list_del_init(&newxprt->sc_accept_q); | |
861 | } | |
862 | if (!list_empty(&listen_rdma->sc_accept_q)) | |
863 | set_bit(XPT_CONN, &listen_rdma->sc_xprt.xpt_flags); | |
864 | spin_unlock_bh(&listen_rdma->sc_lock); | |
865 | if (!newxprt) | |
866 | return NULL; | |
867 | ||
868 | dprintk("svcrdma: newxprt from accept queue = %p, cm_id=%p\n", | |
869 | newxprt, newxprt->sc_cm_id); | |
870 | ||
871 | ret = ib_query_device(newxprt->sc_cm_id->device, &devattr); | |
872 | if (ret) { | |
873 | dprintk("svcrdma: could not query device attributes on " | |
874 | "device %p, rc=%d\n", newxprt->sc_cm_id->device, ret); | |
875 | goto errout; | |
876 | } | |
877 | ||
878 | /* Qualify the transport resource defaults with the | |
879 | * capabilities of this particular device */ | |
880 | newxprt->sc_max_sge = min((size_t)devattr.max_sge, | |
881 | (size_t)RPCSVC_MAXPAGES); | |
882 | newxprt->sc_max_requests = min((size_t)devattr.max_qp_wr, | |
883 | (size_t)svcrdma_max_requests); | |
884 | newxprt->sc_sq_depth = RPCRDMA_SQ_DEPTH_MULT * newxprt->sc_max_requests; | |
885 | ||
36ef25e4 TT |
886 | /* |
887 | * Limit ORD based on client limit, local device limit, and | |
888 | * configured svcrdma limit. | |
889 | */ | |
890 | newxprt->sc_ord = min_t(size_t, devattr.max_qp_rd_atom, newxprt->sc_ord); | |
891 | newxprt->sc_ord = min_t(size_t, svcrdma_ord, newxprt->sc_ord); | |
377f9b2f TT |
892 | |
893 | newxprt->sc_pd = ib_alloc_pd(newxprt->sc_cm_id->device); | |
894 | if (IS_ERR(newxprt->sc_pd)) { | |
895 | dprintk("svcrdma: error creating PD for connect request\n"); | |
896 | goto errout; | |
897 | } | |
898 | newxprt->sc_sq_cq = ib_create_cq(newxprt->sc_cm_id->device, | |
899 | sq_comp_handler, | |
900 | cq_event_handler, | |
901 | newxprt, | |
902 | newxprt->sc_sq_depth, | |
903 | 0); | |
904 | if (IS_ERR(newxprt->sc_sq_cq)) { | |
905 | dprintk("svcrdma: error creating SQ CQ for connect request\n"); | |
906 | goto errout; | |
907 | } | |
908 | newxprt->sc_rq_cq = ib_create_cq(newxprt->sc_cm_id->device, | |
909 | rq_comp_handler, | |
910 | cq_event_handler, | |
911 | newxprt, | |
912 | newxprt->sc_max_requests, | |
913 | 0); | |
914 | if (IS_ERR(newxprt->sc_rq_cq)) { | |
915 | dprintk("svcrdma: error creating RQ CQ for connect request\n"); | |
916 | goto errout; | |
917 | } | |
918 | ||
919 | memset(&qp_attr, 0, sizeof qp_attr); | |
920 | qp_attr.event_handler = qp_event_handler; | |
921 | qp_attr.qp_context = &newxprt->sc_xprt; | |
922 | qp_attr.cap.max_send_wr = newxprt->sc_sq_depth; | |
923 | qp_attr.cap.max_recv_wr = newxprt->sc_max_requests; | |
924 | qp_attr.cap.max_send_sge = newxprt->sc_max_sge; | |
925 | qp_attr.cap.max_recv_sge = newxprt->sc_max_sge; | |
926 | qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR; | |
927 | qp_attr.qp_type = IB_QPT_RC; | |
928 | qp_attr.send_cq = newxprt->sc_sq_cq; | |
929 | qp_attr.recv_cq = newxprt->sc_rq_cq; | |
930 | dprintk("svcrdma: newxprt->sc_cm_id=%p, newxprt->sc_pd=%p\n" | |
931 | " cm_id->device=%p, sc_pd->device=%p\n" | |
932 | " cap.max_send_wr = %d\n" | |
933 | " cap.max_recv_wr = %d\n" | |
934 | " cap.max_send_sge = %d\n" | |
935 | " cap.max_recv_sge = %d\n", | |
936 | newxprt->sc_cm_id, newxprt->sc_pd, | |
937 | newxprt->sc_cm_id->device, newxprt->sc_pd->device, | |
938 | qp_attr.cap.max_send_wr, | |
939 | qp_attr.cap.max_recv_wr, | |
940 | qp_attr.cap.max_send_sge, | |
941 | qp_attr.cap.max_recv_sge); | |
942 | ||
943 | ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd, &qp_attr); | |
944 | if (ret) { | |
945 | /* | |
946 | * XXX: This is a hack. We need a xx_request_qp interface | |
947 | * that will adjust the qp_attr's with a best-effort | |
948 | * number | |
949 | */ | |
950 | qp_attr.cap.max_send_sge -= 2; | |
951 | qp_attr.cap.max_recv_sge -= 2; | |
952 | ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd, | |
953 | &qp_attr); | |
954 | if (ret) { | |
955 | dprintk("svcrdma: failed to create QP, ret=%d\n", ret); | |
956 | goto errout; | |
957 | } | |
958 | newxprt->sc_max_sge = qp_attr.cap.max_send_sge; | |
959 | newxprt->sc_max_sge = qp_attr.cap.max_recv_sge; | |
960 | newxprt->sc_sq_depth = qp_attr.cap.max_send_wr; | |
961 | newxprt->sc_max_requests = qp_attr.cap.max_recv_wr; | |
962 | } | |
963 | newxprt->sc_qp = newxprt->sc_cm_id->qp; | |
964 | ||
3a5c6380 TT |
965 | /* |
966 | * Use the most secure set of MR resources based on the | |
967 | * transport type and available memory management features in | |
968 | * the device. Here's the table implemented below: | |
969 | * | |
970 | * Fast Global DMA Remote WR | |
971 | * Reg LKEY MR Access | |
972 | * Sup'd Sup'd Needed Needed | |
973 | * | |
974 | * IWARP N N Y Y | |
975 | * N Y Y Y | |
976 | * Y N Y N | |
977 | * Y Y N - | |
978 | * | |
979 | * IB N N Y N | |
980 | * N Y N - | |
981 | * Y N Y N | |
982 | * Y Y N - | |
983 | * | |
984 | * NB: iWARP requires remote write access for the data sink | |
985 | * of an RDMA_READ. IB does not. | |
986 | */ | |
987 | if (devattr.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) { | |
988 | newxprt->sc_frmr_pg_list_len = | |
989 | devattr.max_fast_reg_page_list_len; | |
990 | newxprt->sc_dev_caps |= SVCRDMA_DEVCAP_FAST_REG; | |
991 | } | |
992 | ||
993 | /* | |
994 | * Determine if a DMA MR is required and if so, what privs are required | |
995 | */ | |
996 | switch (rdma_node_get_transport(newxprt->sc_cm_id->device->node_type)) { | |
997 | case RDMA_TRANSPORT_IWARP: | |
998 | newxprt->sc_dev_caps |= SVCRDMA_DEVCAP_READ_W_INV; | |
999 | if (!(newxprt->sc_dev_caps & SVCRDMA_DEVCAP_FAST_REG)) { | |
1000 | need_dma_mr = 1; | |
1001 | dma_mr_acc = | |
1002 | (IB_ACCESS_LOCAL_WRITE | | |
1003 | IB_ACCESS_REMOTE_WRITE); | |
1004 | } else if (!(devattr.device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY)) { | |
1005 | need_dma_mr = 1; | |
1006 | dma_mr_acc = IB_ACCESS_LOCAL_WRITE; | |
1007 | } else | |
1008 | need_dma_mr = 0; | |
1009 | break; | |
1010 | case RDMA_TRANSPORT_IB: | |
0bf48289 SW |
1011 | if (!(newxprt->sc_dev_caps & SVCRDMA_DEVCAP_FAST_REG)) { |
1012 | need_dma_mr = 1; | |
1013 | dma_mr_acc = IB_ACCESS_LOCAL_WRITE; | |
1014 | } else if (!(devattr.device_cap_flags & | |
1015 | IB_DEVICE_LOCAL_DMA_LKEY)) { | |
3a5c6380 TT |
1016 | need_dma_mr = 1; |
1017 | dma_mr_acc = IB_ACCESS_LOCAL_WRITE; | |
1018 | } else | |
1019 | need_dma_mr = 0; | |
1020 | break; | |
1021 | default: | |
377f9b2f TT |
1022 | goto errout; |
1023 | } | |
1024 | ||
3a5c6380 TT |
1025 | /* Create the DMA MR if needed, otherwise, use the DMA LKEY */ |
1026 | if (need_dma_mr) { | |
1027 | /* Register all of physical memory */ | |
1028 | newxprt->sc_phys_mr = | |
1029 | ib_get_dma_mr(newxprt->sc_pd, dma_mr_acc); | |
1030 | if (IS_ERR(newxprt->sc_phys_mr)) { | |
1031 | dprintk("svcrdma: Failed to create DMA MR ret=%d\n", | |
1032 | ret); | |
1033 | goto errout; | |
1034 | } | |
1035 | newxprt->sc_dma_lkey = newxprt->sc_phys_mr->lkey; | |
1036 | } else | |
1037 | newxprt->sc_dma_lkey = | |
1038 | newxprt->sc_cm_id->device->local_dma_lkey; | |
1039 | ||
377f9b2f TT |
1040 | /* Post receive buffers */ |
1041 | for (i = 0; i < newxprt->sc_max_requests; i++) { | |
1042 | ret = svc_rdma_post_recv(newxprt); | |
1043 | if (ret) { | |
1044 | dprintk("svcrdma: failure posting receive buffers\n"); | |
1045 | goto errout; | |
1046 | } | |
1047 | } | |
1048 | ||
1049 | /* Swap out the handler */ | |
1050 | newxprt->sc_cm_id->event_handler = rdma_cma_handler; | |
1051 | ||
af261af4 TT |
1052 | /* |
1053 | * Arm the CQs for the SQ and RQ before accepting so we can't | |
1054 | * miss the first message | |
1055 | */ | |
1056 | ib_req_notify_cq(newxprt->sc_sq_cq, IB_CQ_NEXT_COMP); | |
1057 | ib_req_notify_cq(newxprt->sc_rq_cq, IB_CQ_NEXT_COMP); | |
1058 | ||
377f9b2f TT |
1059 | /* Accept Connection */ |
1060 | set_bit(RDMAXPRT_CONN_PENDING, &newxprt->sc_flags); | |
1061 | memset(&conn_param, 0, sizeof conn_param); | |
1062 | conn_param.responder_resources = 0; | |
1063 | conn_param.initiator_depth = newxprt->sc_ord; | |
1064 | ret = rdma_accept(newxprt->sc_cm_id, &conn_param); | |
1065 | if (ret) { | |
1066 | dprintk("svcrdma: failed to accept new connection, ret=%d\n", | |
1067 | ret); | |
1068 | goto errout; | |
1069 | } | |
1070 | ||
1071 | dprintk("svcrdma: new connection %p accepted with the following " | |
1072 | "attributes:\n" | |
21454aaa | 1073 | " local_ip : %pI4\n" |
377f9b2f | 1074 | " local_port : %d\n" |
21454aaa | 1075 | " remote_ip : %pI4\n" |
377f9b2f TT |
1076 | " remote_port : %d\n" |
1077 | " max_sge : %d\n" | |
1078 | " sq_depth : %d\n" | |
1079 | " max_requests : %d\n" | |
1080 | " ord : %d\n", | |
1081 | newxprt, | |
21454aaa HH |
1082 | &((struct sockaddr_in *)&newxprt->sc_cm_id-> |
1083 | route.addr.src_addr)->sin_addr.s_addr, | |
377f9b2f TT |
1084 | ntohs(((struct sockaddr_in *)&newxprt->sc_cm_id-> |
1085 | route.addr.src_addr)->sin_port), | |
21454aaa HH |
1086 | &((struct sockaddr_in *)&newxprt->sc_cm_id-> |
1087 | route.addr.dst_addr)->sin_addr.s_addr, | |
377f9b2f TT |
1088 | ntohs(((struct sockaddr_in *)&newxprt->sc_cm_id-> |
1089 | route.addr.dst_addr)->sin_port), | |
1090 | newxprt->sc_max_sge, | |
1091 | newxprt->sc_sq_depth, | |
1092 | newxprt->sc_max_requests, | |
1093 | newxprt->sc_ord); | |
1094 | ||
377f9b2f TT |
1095 | return &newxprt->sc_xprt; |
1096 | ||
1097 | errout: | |
1098 | dprintk("svcrdma: failure accepting new connection rc=%d.\n", ret); | |
c48cbb40 TT |
1099 | /* Take a reference in case the DTO handler runs */ |
1100 | svc_xprt_get(&newxprt->sc_xprt); | |
1711386c | 1101 | if (newxprt->sc_qp && !IS_ERR(newxprt->sc_qp)) |
c48cbb40 | 1102 | ib_destroy_qp(newxprt->sc_qp); |
377f9b2f | 1103 | rdma_destroy_id(newxprt->sc_cm_id); |
c48cbb40 TT |
1104 | /* This call to put will destroy the transport */ |
1105 | svc_xprt_put(&newxprt->sc_xprt); | |
377f9b2f TT |
1106 | return NULL; |
1107 | } | |
1108 | ||
377f9b2f TT |
1109 | static void svc_rdma_release_rqst(struct svc_rqst *rqstp) |
1110 | { | |
377f9b2f TT |
1111 | } |
1112 | ||
c48cbb40 | 1113 | /* |
1711386c | 1114 | * When connected, an svc_xprt has at least two references: |
c48cbb40 TT |
1115 | * |
1116 | * - A reference held by the cm_id between the ESTABLISHED and | |
1117 | * DISCONNECTED events. If the remote peer disconnected first, this | |
1118 | * reference could be gone. | |
1119 | * | |
1120 | * - A reference held by the svc_recv code that called this function | |
1121 | * as part of close processing. | |
1122 | * | |
1711386c | 1123 | * At a minimum one references should still be held. |
c48cbb40 | 1124 | */ |
377f9b2f TT |
1125 | static void svc_rdma_detach(struct svc_xprt *xprt) |
1126 | { | |
1127 | struct svcxprt_rdma *rdma = | |
1128 | container_of(xprt, struct svcxprt_rdma, sc_xprt); | |
377f9b2f | 1129 | dprintk("svc: svc_rdma_detach(%p)\n", xprt); |
c48cbb40 TT |
1130 | |
1131 | /* Disconnect and flush posted WQE */ | |
377f9b2f | 1132 | rdma_disconnect(rdma->sc_cm_id); |
377f9b2f TT |
1133 | } |
1134 | ||
8da91ea8 | 1135 | static void __svc_rdma_free(struct work_struct *work) |
377f9b2f | 1136 | { |
8da91ea8 TT |
1137 | struct svcxprt_rdma *rdma = |
1138 | container_of(work, struct svcxprt_rdma, sc_work); | |
377f9b2f | 1139 | dprintk("svcrdma: svc_rdma_free(%p)\n", rdma); |
8da91ea8 | 1140 | |
c48cbb40 | 1141 | /* We should only be called from kref_put */ |
8da91ea8 TT |
1142 | BUG_ON(atomic_read(&rdma->sc_xprt.xpt_ref.refcount) != 0); |
1143 | ||
356d0a15 TT |
1144 | /* |
1145 | * Destroy queued, but not processed read completions. Note | |
1146 | * that this cleanup has to be done before destroying the | |
1147 | * cm_id because the device ptr is needed to unmap the dma in | |
1148 | * svc_rdma_put_context. | |
1149 | */ | |
356d0a15 TT |
1150 | while (!list_empty(&rdma->sc_read_complete_q)) { |
1151 | struct svc_rdma_op_ctxt *ctxt; | |
1152 | ctxt = list_entry(rdma->sc_read_complete_q.next, | |
1153 | struct svc_rdma_op_ctxt, | |
1154 | dto_q); | |
1155 | list_del_init(&ctxt->dto_q); | |
1156 | svc_rdma_put_context(ctxt, 1); | |
1157 | } | |
356d0a15 TT |
1158 | |
1159 | /* Destroy queued, but not processed recv completions */ | |
356d0a15 TT |
1160 | while (!list_empty(&rdma->sc_rq_dto_q)) { |
1161 | struct svc_rdma_op_ctxt *ctxt; | |
1162 | ctxt = list_entry(rdma->sc_rq_dto_q.next, | |
1163 | struct svc_rdma_op_ctxt, | |
1164 | dto_q); | |
1165 | list_del_init(&ctxt->dto_q); | |
1166 | svc_rdma_put_context(ctxt, 1); | |
1167 | } | |
356d0a15 TT |
1168 | |
1169 | /* Warn if we leaked a resource or under-referenced */ | |
1170 | WARN_ON(atomic_read(&rdma->sc_ctxt_used) != 0); | |
87295b6c | 1171 | WARN_ON(atomic_read(&rdma->sc_dma_used) != 0); |
356d0a15 | 1172 | |
64be8608 TT |
1173 | /* De-allocate fastreg mr */ |
1174 | rdma_dealloc_frmr_q(rdma); | |
1175 | ||
1711386c TT |
1176 | /* Destroy the QP if present (not a listener) */ |
1177 | if (rdma->sc_qp && !IS_ERR(rdma->sc_qp)) | |
1178 | ib_destroy_qp(rdma->sc_qp); | |
1179 | ||
c48cbb40 TT |
1180 | if (rdma->sc_sq_cq && !IS_ERR(rdma->sc_sq_cq)) |
1181 | ib_destroy_cq(rdma->sc_sq_cq); | |
377f9b2f | 1182 | |
c48cbb40 TT |
1183 | if (rdma->sc_rq_cq && !IS_ERR(rdma->sc_rq_cq)) |
1184 | ib_destroy_cq(rdma->sc_rq_cq); | |
377f9b2f | 1185 | |
c48cbb40 TT |
1186 | if (rdma->sc_phys_mr && !IS_ERR(rdma->sc_phys_mr)) |
1187 | ib_dereg_mr(rdma->sc_phys_mr); | |
377f9b2f | 1188 | |
c48cbb40 TT |
1189 | if (rdma->sc_pd && !IS_ERR(rdma->sc_pd)) |
1190 | ib_dealloc_pd(rdma->sc_pd); | |
377f9b2f | 1191 | |
356d0a15 TT |
1192 | /* Destroy the CM ID */ |
1193 | rdma_destroy_id(rdma->sc_cm_id); | |
1194 | ||
c48cbb40 | 1195 | kfree(rdma); |
377f9b2f TT |
1196 | } |
1197 | ||
8da91ea8 TT |
1198 | static void svc_rdma_free(struct svc_xprt *xprt) |
1199 | { | |
1200 | struct svcxprt_rdma *rdma = | |
1201 | container_of(xprt, struct svcxprt_rdma, sc_xprt); | |
1202 | INIT_WORK(&rdma->sc_work, __svc_rdma_free); | |
a25e758c | 1203 | queue_work(svc_rdma_wq, &rdma->sc_work); |
8da91ea8 TT |
1204 | } |
1205 | ||
377f9b2f TT |
1206 | static int svc_rdma_has_wspace(struct svc_xprt *xprt) |
1207 | { | |
1208 | struct svcxprt_rdma *rdma = | |
1209 | container_of(xprt, struct svcxprt_rdma, sc_xprt); | |
1210 | ||
1211 | /* | |
0bf48289 | 1212 | * If there are already waiters on the SQ, |
377f9b2f TT |
1213 | * return false. |
1214 | */ | |
1215 | if (waitqueue_active(&rdma->sc_send_wait)) | |
1216 | return 0; | |
1217 | ||
1218 | /* Otherwise return true. */ | |
1219 | return 1; | |
1220 | } | |
1221 | ||
16e4d93f CL |
1222 | static int svc_rdma_secure_port(struct svc_rqst *rqstp) |
1223 | { | |
1224 | return 1; | |
1225 | } | |
1226 | ||
e1183210 TT |
1227 | /* |
1228 | * Attempt to register the kvec representing the RPC memory with the | |
1229 | * device. | |
1230 | * | |
1231 | * Returns: | |
1232 | * NULL : The device does not support fastreg or there were no more | |
1233 | * fastreg mr. | |
1234 | * frmr : The kvec register request was successfully posted. | |
1235 | * <0 : An error was encountered attempting to register the kvec. | |
1236 | */ | |
1237 | int svc_rdma_fastreg(struct svcxprt_rdma *xprt, | |
1238 | struct svc_rdma_fastreg_mr *frmr) | |
1239 | { | |
1240 | struct ib_send_wr fastreg_wr; | |
1241 | u8 key; | |
1242 | ||
1243 | /* Bump the key */ | |
1244 | key = (u8)(frmr->mr->lkey & 0x000000FF); | |
1245 | ib_update_fast_reg_key(frmr->mr, ++key); | |
1246 | ||
1247 | /* Prepare FASTREG WR */ | |
1248 | memset(&fastreg_wr, 0, sizeof fastreg_wr); | |
1249 | fastreg_wr.opcode = IB_WR_FAST_REG_MR; | |
1250 | fastreg_wr.send_flags = IB_SEND_SIGNALED; | |
1251 | fastreg_wr.wr.fast_reg.iova_start = (unsigned long)frmr->kva; | |
1252 | fastreg_wr.wr.fast_reg.page_list = frmr->page_list; | |
1253 | fastreg_wr.wr.fast_reg.page_list_len = frmr->page_list_len; | |
1254 | fastreg_wr.wr.fast_reg.page_shift = PAGE_SHIFT; | |
1255 | fastreg_wr.wr.fast_reg.length = frmr->map_len; | |
1256 | fastreg_wr.wr.fast_reg.access_flags = frmr->access_flags; | |
1257 | fastreg_wr.wr.fast_reg.rkey = frmr->mr->lkey; | |
1258 | return svc_rdma_send(xprt, &fastreg_wr); | |
1259 | } | |
1260 | ||
377f9b2f TT |
1261 | int svc_rdma_send(struct svcxprt_rdma *xprt, struct ib_send_wr *wr) |
1262 | { | |
5b180a9a TT |
1263 | struct ib_send_wr *bad_wr, *n_wr; |
1264 | int wr_count; | |
1265 | int i; | |
377f9b2f TT |
1266 | int ret; |
1267 | ||
1268 | if (test_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags)) | |
9d6347ac | 1269 | return -ENOTCONN; |
377f9b2f TT |
1270 | |
1271 | BUG_ON(wr->send_flags != IB_SEND_SIGNALED); | |
5b180a9a TT |
1272 | wr_count = 1; |
1273 | for (n_wr = wr->next; n_wr; n_wr = n_wr->next) | |
1274 | wr_count++; | |
1275 | ||
377f9b2f TT |
1276 | /* If the SQ is full, wait until an SQ entry is available */ |
1277 | while (1) { | |
1278 | spin_lock_bh(&xprt->sc_lock); | |
5b180a9a | 1279 | if (xprt->sc_sq_depth < atomic_read(&xprt->sc_sq_count) + wr_count) { |
377f9b2f TT |
1280 | spin_unlock_bh(&xprt->sc_lock); |
1281 | atomic_inc(&rdma_stat_sq_starve); | |
dbcd00eb TT |
1282 | |
1283 | /* See if we can opportunistically reap SQ WR to make room */ | |
377f9b2f TT |
1284 | sq_cq_reap(xprt); |
1285 | ||
1286 | /* Wait until SQ WR available if SQ still full */ | |
1287 | wait_event(xprt->sc_send_wait, | |
1288 | atomic_read(&xprt->sc_sq_count) < | |
1289 | xprt->sc_sq_depth); | |
830bb59b | 1290 | if (test_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags)) |
b432e6b3 | 1291 | return -ENOTCONN; |
377f9b2f TT |
1292 | continue; |
1293 | } | |
5b180a9a TT |
1294 | /* Take a transport ref for each WR posted */ |
1295 | for (i = 0; i < wr_count; i++) | |
1296 | svc_xprt_get(&xprt->sc_xprt); | |
1297 | ||
1298 | /* Bump used SQ WR count and post */ | |
1299 | atomic_add(wr_count, &xprt->sc_sq_count); | |
377f9b2f | 1300 | ret = ib_post_send(xprt->sc_qp, wr, &bad_wr); |
5b180a9a TT |
1301 | if (ret) { |
1302 | set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags); | |
1303 | atomic_sub(wr_count, &xprt->sc_sq_count); | |
1304 | for (i = 0; i < wr_count; i ++) | |
1305 | svc_xprt_put(&xprt->sc_xprt); | |
377f9b2f TT |
1306 | dprintk("svcrdma: failed to post SQ WR rc=%d, " |
1307 | "sc_sq_count=%d, sc_sq_depth=%d\n", | |
1308 | ret, atomic_read(&xprt->sc_sq_count), | |
1309 | xprt->sc_sq_depth); | |
0905c0f0 | 1310 | } |
377f9b2f | 1311 | spin_unlock_bh(&xprt->sc_lock); |
5b180a9a TT |
1312 | if (ret) |
1313 | wake_up(&xprt->sc_send_wait); | |
377f9b2f TT |
1314 | break; |
1315 | } | |
1316 | return ret; | |
1317 | } | |
1318 | ||
008fdbc5 TT |
1319 | void svc_rdma_send_error(struct svcxprt_rdma *xprt, struct rpcrdma_msg *rmsgp, |
1320 | enum rpcrdma_errcode err) | |
377f9b2f TT |
1321 | { |
1322 | struct ib_send_wr err_wr; | |
377f9b2f TT |
1323 | struct page *p; |
1324 | struct svc_rdma_op_ctxt *ctxt; | |
1325 | u32 *va; | |
1326 | int length; | |
1327 | int ret; | |
1328 | ||
1329 | p = svc_rdma_get_page(); | |
1330 | va = page_address(p); | |
1331 | ||
1332 | /* XDR encode error */ | |
1333 | length = svc_rdma_xdr_encode_error(xprt, rmsgp, err, va); | |
1334 | ||
4a84386f TT |
1335 | ctxt = svc_rdma_get_context(xprt); |
1336 | ctxt->direction = DMA_FROM_DEVICE; | |
1337 | ctxt->count = 1; | |
1338 | ctxt->pages[0] = p; | |
1339 | ||
377f9b2f | 1340 | /* Prepare SGE for local address */ |
4a84386f TT |
1341 | ctxt->sge[0].addr = ib_dma_map_page(xprt->sc_cm_id->device, |
1342 | p, 0, length, DMA_FROM_DEVICE); | |
1343 | if (ib_dma_mapping_error(xprt->sc_cm_id->device, ctxt->sge[0].addr)) { | |
04911b53 | 1344 | put_page(p); |
a5e50268 | 1345 | svc_rdma_put_context(ctxt, 1); |
04911b53 TT |
1346 | return; |
1347 | } | |
1348 | atomic_inc(&xprt->sc_dma_used); | |
4a84386f TT |
1349 | ctxt->sge[0].lkey = xprt->sc_dma_lkey; |
1350 | ctxt->sge[0].length = length; | |
377f9b2f TT |
1351 | |
1352 | /* Prepare SEND WR */ | |
1353 | memset(&err_wr, 0, sizeof err_wr); | |
1354 | ctxt->wr_op = IB_WR_SEND; | |
1355 | err_wr.wr_id = (unsigned long)ctxt; | |
4a84386f | 1356 | err_wr.sg_list = ctxt->sge; |
377f9b2f TT |
1357 | err_wr.num_sge = 1; |
1358 | err_wr.opcode = IB_WR_SEND; | |
1359 | err_wr.send_flags = IB_SEND_SIGNALED; | |
1360 | ||
1361 | /* Post It */ | |
1362 | ret = svc_rdma_send(xprt, &err_wr); | |
1363 | if (ret) { | |
008fdbc5 TT |
1364 | dprintk("svcrdma: Error %d posting send for protocol error\n", |
1365 | ret); | |
4a84386f | 1366 | svc_rdma_unmap_dma(ctxt); |
377f9b2f TT |
1367 | svc_rdma_put_context(ctxt, 1); |
1368 | } | |
377f9b2f | 1369 | } |