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377f9b2f TT |
1 | /* |
2 | * Copyright (c) 2005-2007 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. | |
38 | * | |
39 | * Author: Tom Tucker <tom@opengridcomputing.com> | |
40 | */ | |
41 | ||
42 | #include <linux/sunrpc/svc_xprt.h> | |
43 | #include <linux/sunrpc/debug.h> | |
44 | #include <linux/sunrpc/rpc_rdma.h> | |
a6b7a407 | 45 | #include <linux/interrupt.h> |
d43c36dc | 46 | #include <linux/sched.h> |
5a0e3ad6 | 47 | #include <linux/slab.h> |
377f9b2f | 48 | #include <linux/spinlock.h> |
a25e758c | 49 | #include <linux/workqueue.h> |
377f9b2f TT |
50 | #include <rdma/ib_verbs.h> |
51 | #include <rdma/rdma_cm.h> | |
52 | #include <linux/sunrpc/svc_rdma.h> | |
bc3b2d7f | 53 | #include <linux/export.h> |
cec56c8f | 54 | #include "xprt_rdma.h" |
377f9b2f TT |
55 | |
56 | #define RPCDBG_FACILITY RPCDBG_SVCXPRT | |
57 | ||
58 | static struct svc_xprt *svc_rdma_create(struct svc_serv *serv, | |
62832c03 | 59 | struct net *net, |
377f9b2f TT |
60 | struct sockaddr *sa, int salen, |
61 | int flags); | |
62 | static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt); | |
63 | static void svc_rdma_release_rqst(struct svc_rqst *); | |
377f9b2f TT |
64 | static void dto_tasklet_func(unsigned long data); |
65 | static void svc_rdma_detach(struct svc_xprt *xprt); | |
66 | static void svc_rdma_free(struct svc_xprt *xprt); | |
67 | static int svc_rdma_has_wspace(struct svc_xprt *xprt); | |
68 | static void rq_cq_reap(struct svcxprt_rdma *xprt); | |
69 | static void sq_cq_reap(struct svcxprt_rdma *xprt); | |
70 | ||
5eaa65b2 | 71 | static DECLARE_TASKLET(dto_tasklet, dto_tasklet_func, 0UL); |
377f9b2f TT |
72 | static DEFINE_SPINLOCK(dto_lock); |
73 | static LIST_HEAD(dto_xprt_q); | |
74 | ||
75 | static struct svc_xprt_ops svc_rdma_ops = { | |
76 | .xpo_create = svc_rdma_create, | |
77 | .xpo_recvfrom = svc_rdma_recvfrom, | |
78 | .xpo_sendto = svc_rdma_sendto, | |
79 | .xpo_release_rqst = svc_rdma_release_rqst, | |
80 | .xpo_detach = svc_rdma_detach, | |
81 | .xpo_free = svc_rdma_free, | |
82 | .xpo_prep_reply_hdr = svc_rdma_prep_reply_hdr, | |
83 | .xpo_has_wspace = svc_rdma_has_wspace, | |
84 | .xpo_accept = svc_rdma_accept, | |
85 | }; | |
86 | ||
87 | struct svc_xprt_class svc_rdma_class = { | |
88 | .xcl_name = "rdma", | |
89 | .xcl_owner = THIS_MODULE, | |
90 | .xcl_ops = &svc_rdma_ops, | |
91 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, | |
92 | }; | |
93 | ||
377f9b2f TT |
94 | struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt) |
95 | { | |
96 | struct svc_rdma_op_ctxt *ctxt; | |
97 | ||
98 | while (1) { | |
8948896c TT |
99 | ctxt = kmem_cache_alloc(svc_rdma_ctxt_cachep, GFP_KERNEL); |
100 | if (ctxt) | |
101 | break; | |
102 | schedule_timeout_uninterruptible(msecs_to_jiffies(500)); | |
377f9b2f | 103 | } |
8948896c TT |
104 | ctxt->xprt = xprt; |
105 | INIT_LIST_HEAD(&ctxt->dto_q); | |
106 | ctxt->count = 0; | |
64be8608 | 107 | ctxt->frmr = NULL; |
8948896c | 108 | atomic_inc(&xprt->sc_ctxt_used); |
377f9b2f TT |
109 | return ctxt; |
110 | } | |
111 | ||
146b6df6 | 112 | void svc_rdma_unmap_dma(struct svc_rdma_op_ctxt *ctxt) |
e6ab9143 TT |
113 | { |
114 | struct svcxprt_rdma *xprt = ctxt->xprt; | |
115 | int i; | |
116 | for (i = 0; i < ctxt->count && ctxt->sge[i].length; i++) { | |
64be8608 TT |
117 | /* |
118 | * Unmap the DMA addr in the SGE if the lkey matches | |
119 | * the sc_dma_lkey, otherwise, ignore it since it is | |
120 | * an FRMR lkey and will be unmapped later when the | |
121 | * last WR that uses it completes. | |
122 | */ | |
123 | if (ctxt->sge[i].lkey == xprt->sc_dma_lkey) { | |
124 | atomic_dec(&xprt->sc_dma_used); | |
b432e6b3 | 125 | ib_dma_unmap_page(xprt->sc_cm_id->device, |
64be8608 TT |
126 | ctxt->sge[i].addr, |
127 | ctxt->sge[i].length, | |
128 | ctxt->direction); | |
129 | } | |
e6ab9143 TT |
130 | } |
131 | } | |
132 | ||
377f9b2f TT |
133 | void svc_rdma_put_context(struct svc_rdma_op_ctxt *ctxt, int free_pages) |
134 | { | |
135 | struct svcxprt_rdma *xprt; | |
136 | int i; | |
137 | ||
138 | BUG_ON(!ctxt); | |
139 | xprt = ctxt->xprt; | |
140 | if (free_pages) | |
141 | for (i = 0; i < ctxt->count; i++) | |
142 | put_page(ctxt->pages[i]); | |
143 | ||
8948896c | 144 | kmem_cache_free(svc_rdma_ctxt_cachep, ctxt); |
87407673 | 145 | atomic_dec(&xprt->sc_ctxt_used); |
377f9b2f TT |
146 | } |
147 | ||
ab96dddb TT |
148 | /* |
149 | * Temporary NFS req mappings are shared across all transport | |
150 | * instances. These are short lived and should be bounded by the number | |
151 | * of concurrent server threads * depth of the SQ. | |
152 | */ | |
153 | struct svc_rdma_req_map *svc_rdma_get_req_map(void) | |
154 | { | |
155 | struct svc_rdma_req_map *map; | |
156 | while (1) { | |
157 | map = kmem_cache_alloc(svc_rdma_map_cachep, GFP_KERNEL); | |
158 | if (map) | |
159 | break; | |
160 | schedule_timeout_uninterruptible(msecs_to_jiffies(500)); | |
161 | } | |
162 | map->count = 0; | |
64be8608 | 163 | map->frmr = NULL; |
ab96dddb TT |
164 | return map; |
165 | } | |
166 | ||
167 | void svc_rdma_put_req_map(struct svc_rdma_req_map *map) | |
168 | { | |
169 | kmem_cache_free(svc_rdma_map_cachep, map); | |
170 | } | |
171 | ||
377f9b2f TT |
172 | /* ib_cq event handler */ |
173 | static void cq_event_handler(struct ib_event *event, void *context) | |
174 | { | |
175 | struct svc_xprt *xprt = context; | |
176 | dprintk("svcrdma: received CQ event id=%d, context=%p\n", | |
177 | event->event, context); | |
178 | set_bit(XPT_CLOSE, &xprt->xpt_flags); | |
179 | } | |
180 | ||
181 | /* QP event handler */ | |
182 | static void qp_event_handler(struct ib_event *event, void *context) | |
183 | { | |
184 | struct svc_xprt *xprt = context; | |
185 | ||
186 | switch (event->event) { | |
187 | /* These are considered benign events */ | |
188 | case IB_EVENT_PATH_MIG: | |
189 | case IB_EVENT_COMM_EST: | |
190 | case IB_EVENT_SQ_DRAINED: | |
191 | case IB_EVENT_QP_LAST_WQE_REACHED: | |
192 | dprintk("svcrdma: QP event %d received for QP=%p\n", | |
193 | event->event, event->element.qp); | |
194 | break; | |
195 | /* These are considered fatal events */ | |
196 | case IB_EVENT_PATH_MIG_ERR: | |
197 | case IB_EVENT_QP_FATAL: | |
198 | case IB_EVENT_QP_REQ_ERR: | |
199 | case IB_EVENT_QP_ACCESS_ERR: | |
200 | case IB_EVENT_DEVICE_FATAL: | |
201 | default: | |
202 | dprintk("svcrdma: QP ERROR event %d received for QP=%p, " | |
203 | "closing transport\n", | |
204 | event->event, event->element.qp); | |
205 | set_bit(XPT_CLOSE, &xprt->xpt_flags); | |
206 | break; | |
207 | } | |
208 | } | |
209 | ||
210 | /* | |
211 | * Data Transfer Operation Tasklet | |
212 | * | |
213 | * Walks a list of transports with I/O pending, removing entries as | |
214 | * they are added to the server's I/O pending list. Two bits indicate | |
215 | * if SQ, RQ, or both have I/O pending. The dto_lock is an irqsave | |
216 | * spinlock that serializes access to the transport list with the RQ | |
217 | * and SQ interrupt handlers. | |
218 | */ | |
219 | static void dto_tasklet_func(unsigned long data) | |
220 | { | |
221 | struct svcxprt_rdma *xprt; | |
222 | unsigned long flags; | |
223 | ||
224 | spin_lock_irqsave(&dto_lock, flags); | |
225 | while (!list_empty(&dto_xprt_q)) { | |
226 | xprt = list_entry(dto_xprt_q.next, | |
227 | struct svcxprt_rdma, sc_dto_q); | |
228 | list_del_init(&xprt->sc_dto_q); | |
229 | spin_unlock_irqrestore(&dto_lock, flags); | |
230 | ||
dbcd00eb TT |
231 | rq_cq_reap(xprt); |
232 | sq_cq_reap(xprt); | |
377f9b2f | 233 | |
c48cbb40 | 234 | svc_xprt_put(&xprt->sc_xprt); |
377f9b2f TT |
235 | spin_lock_irqsave(&dto_lock, flags); |
236 | } | |
237 | spin_unlock_irqrestore(&dto_lock, flags); | |
238 | } | |
239 | ||
240 | /* | |
241 | * Receive Queue Completion Handler | |
242 | * | |
243 | * Since an RQ completion handler is called on interrupt context, we | |
244 | * need to defer the handling of the I/O to a tasklet | |
245 | */ | |
246 | static void rq_comp_handler(struct ib_cq *cq, void *cq_context) | |
247 | { | |
248 | struct svcxprt_rdma *xprt = cq_context; | |
249 | unsigned long flags; | |
250 | ||
1711386c TT |
251 | /* Guard against unconditional flush call for destroyed QP */ |
252 | if (atomic_read(&xprt->sc_xprt.xpt_ref.refcount)==0) | |
253 | return; | |
254 | ||
377f9b2f TT |
255 | /* |
256 | * Set the bit regardless of whether or not it's on the list | |
257 | * because it may be on the list already due to an SQ | |
258 | * completion. | |
1711386c | 259 | */ |
377f9b2f TT |
260 | set_bit(RDMAXPRT_RQ_PENDING, &xprt->sc_flags); |
261 | ||
262 | /* | |
263 | * If this transport is not already on the DTO transport queue, | |
264 | * add it | |
265 | */ | |
266 | spin_lock_irqsave(&dto_lock, flags); | |
c48cbb40 TT |
267 | if (list_empty(&xprt->sc_dto_q)) { |
268 | svc_xprt_get(&xprt->sc_xprt); | |
377f9b2f | 269 | list_add_tail(&xprt->sc_dto_q, &dto_xprt_q); |
c48cbb40 | 270 | } |
377f9b2f TT |
271 | spin_unlock_irqrestore(&dto_lock, flags); |
272 | ||
273 | /* Tasklet does all the work to avoid irqsave locks. */ | |
274 | tasklet_schedule(&dto_tasklet); | |
275 | } | |
276 | ||
277 | /* | |
278 | * rq_cq_reap - Process the RQ CQ. | |
279 | * | |
280 | * Take all completing WC off the CQE and enqueue the associated DTO | |
281 | * context on the dto_q for the transport. | |
0905c0f0 TT |
282 | * |
283 | * Note that caller must hold a transport reference. | |
377f9b2f TT |
284 | */ |
285 | static void rq_cq_reap(struct svcxprt_rdma *xprt) | |
286 | { | |
287 | int ret; | |
288 | struct ib_wc wc; | |
289 | struct svc_rdma_op_ctxt *ctxt = NULL; | |
290 | ||
dbcd00eb TT |
291 | if (!test_and_clear_bit(RDMAXPRT_RQ_PENDING, &xprt->sc_flags)) |
292 | return; | |
293 | ||
294 | ib_req_notify_cq(xprt->sc_rq_cq, IB_CQ_NEXT_COMP); | |
377f9b2f TT |
295 | atomic_inc(&rdma_stat_rq_poll); |
296 | ||
377f9b2f TT |
297 | while ((ret = ib_poll_cq(xprt->sc_rq_cq, 1, &wc)) > 0) { |
298 | ctxt = (struct svc_rdma_op_ctxt *)(unsigned long)wc.wr_id; | |
299 | ctxt->wc_status = wc.status; | |
300 | ctxt->byte_len = wc.byte_len; | |
e6ab9143 | 301 | svc_rdma_unmap_dma(ctxt); |
377f9b2f TT |
302 | if (wc.status != IB_WC_SUCCESS) { |
303 | /* Close the transport */ | |
0905c0f0 | 304 | dprintk("svcrdma: transport closing putting ctxt %p\n", ctxt); |
377f9b2f TT |
305 | set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags); |
306 | svc_rdma_put_context(ctxt, 1); | |
0905c0f0 | 307 | svc_xprt_put(&xprt->sc_xprt); |
377f9b2f TT |
308 | continue; |
309 | } | |
47698e08 | 310 | spin_lock_bh(&xprt->sc_rq_dto_lock); |
377f9b2f | 311 | list_add_tail(&ctxt->dto_q, &xprt->sc_rq_dto_q); |
47698e08 | 312 | spin_unlock_bh(&xprt->sc_rq_dto_lock); |
0905c0f0 | 313 | svc_xprt_put(&xprt->sc_xprt); |
377f9b2f | 314 | } |
377f9b2f TT |
315 | |
316 | if (ctxt) | |
317 | atomic_inc(&rdma_stat_rq_prod); | |
dbcd00eb TT |
318 | |
319 | set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags); | |
320 | /* | |
321 | * If data arrived before established event, | |
322 | * don't enqueue. This defers RPC I/O until the | |
323 | * RDMA connection is complete. | |
324 | */ | |
325 | if (!test_bit(RDMAXPRT_CONN_PENDING, &xprt->sc_flags)) | |
326 | svc_xprt_enqueue(&xprt->sc_xprt); | |
377f9b2f TT |
327 | } |
328 | ||
e1183210 | 329 | /* |
70f23fd6 | 330 | * Process a completion context |
e1183210 TT |
331 | */ |
332 | static void process_context(struct svcxprt_rdma *xprt, | |
333 | struct svc_rdma_op_ctxt *ctxt) | |
334 | { | |
335 | svc_rdma_unmap_dma(ctxt); | |
336 | ||
337 | switch (ctxt->wr_op) { | |
338 | case IB_WR_SEND: | |
afd566ea TT |
339 | if (test_bit(RDMACTXT_F_FAST_UNREG, &ctxt->flags)) |
340 | svc_rdma_put_frmr(xprt, ctxt->frmr); | |
e1183210 TT |
341 | svc_rdma_put_context(ctxt, 1); |
342 | break; | |
343 | ||
344 | case IB_WR_RDMA_WRITE: | |
345 | svc_rdma_put_context(ctxt, 0); | |
346 | break; | |
347 | ||
348 | case IB_WR_RDMA_READ: | |
146b6df6 | 349 | case IB_WR_RDMA_READ_WITH_INV: |
e1183210 TT |
350 | if (test_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags)) { |
351 | struct svc_rdma_op_ctxt *read_hdr = ctxt->read_hdr; | |
352 | BUG_ON(!read_hdr); | |
146b6df6 TT |
353 | if (test_bit(RDMACTXT_F_FAST_UNREG, &ctxt->flags)) |
354 | svc_rdma_put_frmr(xprt, ctxt->frmr); | |
e1183210 TT |
355 | spin_lock_bh(&xprt->sc_rq_dto_lock); |
356 | set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags); | |
357 | list_add_tail(&read_hdr->dto_q, | |
358 | &xprt->sc_read_complete_q); | |
359 | spin_unlock_bh(&xprt->sc_rq_dto_lock); | |
360 | svc_xprt_enqueue(&xprt->sc_xprt); | |
361 | } | |
362 | svc_rdma_put_context(ctxt, 0); | |
363 | break; | |
364 | ||
365 | default: | |
366 | printk(KERN_ERR "svcrdma: unexpected completion type, " | |
367 | "opcode=%d\n", | |
368 | ctxt->wr_op); | |
369 | break; | |
370 | } | |
371 | } | |
372 | ||
377f9b2f TT |
373 | /* |
374 | * Send Queue Completion Handler - potentially called on interrupt context. | |
0905c0f0 TT |
375 | * |
376 | * Note that caller must hold a transport reference. | |
377f9b2f TT |
377 | */ |
378 | static void sq_cq_reap(struct svcxprt_rdma *xprt) | |
379 | { | |
380 | struct svc_rdma_op_ctxt *ctxt = NULL; | |
381 | struct ib_wc wc; | |
382 | struct ib_cq *cq = xprt->sc_sq_cq; | |
383 | int ret; | |
384 | ||
dbcd00eb TT |
385 | if (!test_and_clear_bit(RDMAXPRT_SQ_PENDING, &xprt->sc_flags)) |
386 | return; | |
387 | ||
388 | ib_req_notify_cq(xprt->sc_sq_cq, IB_CQ_NEXT_COMP); | |
377f9b2f TT |
389 | atomic_inc(&rdma_stat_sq_poll); |
390 | while ((ret = ib_poll_cq(cq, 1, &wc)) > 0) { | |
377f9b2f TT |
391 | if (wc.status != IB_WC_SUCCESS) |
392 | /* Close the transport */ | |
393 | set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags); | |
394 | ||
395 | /* Decrement used SQ WR count */ | |
396 | atomic_dec(&xprt->sc_sq_count); | |
397 | wake_up(&xprt->sc_send_wait); | |
398 | ||
e1183210 TT |
399 | ctxt = (struct svc_rdma_op_ctxt *)(unsigned long)wc.wr_id; |
400 | if (ctxt) | |
401 | process_context(xprt, ctxt); | |
377f9b2f | 402 | |
0905c0f0 | 403 | svc_xprt_put(&xprt->sc_xprt); |
377f9b2f TT |
404 | } |
405 | ||
406 | if (ctxt) | |
407 | atomic_inc(&rdma_stat_sq_prod); | |
408 | } | |
409 | ||
410 | static void sq_comp_handler(struct ib_cq *cq, void *cq_context) | |
411 | { | |
412 | struct svcxprt_rdma *xprt = cq_context; | |
413 | unsigned long flags; | |
414 | ||
1711386c TT |
415 | /* Guard against unconditional flush call for destroyed QP */ |
416 | if (atomic_read(&xprt->sc_xprt.xpt_ref.refcount)==0) | |
417 | return; | |
418 | ||
377f9b2f TT |
419 | /* |
420 | * Set the bit regardless of whether or not it's on the list | |
421 | * because it may be on the list already due to an RQ | |
422 | * completion. | |
1711386c | 423 | */ |
377f9b2f TT |
424 | set_bit(RDMAXPRT_SQ_PENDING, &xprt->sc_flags); |
425 | ||
426 | /* | |
427 | * If this transport is not already on the DTO transport queue, | |
428 | * add it | |
429 | */ | |
430 | spin_lock_irqsave(&dto_lock, flags); | |
c48cbb40 TT |
431 | if (list_empty(&xprt->sc_dto_q)) { |
432 | svc_xprt_get(&xprt->sc_xprt); | |
377f9b2f | 433 | list_add_tail(&xprt->sc_dto_q, &dto_xprt_q); |
c48cbb40 | 434 | } |
377f9b2f TT |
435 | spin_unlock_irqrestore(&dto_lock, flags); |
436 | ||
437 | /* Tasklet does all the work to avoid irqsave locks. */ | |
438 | tasklet_schedule(&dto_tasklet); | |
439 | } | |
440 | ||
377f9b2f TT |
441 | static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *serv, |
442 | int listener) | |
443 | { | |
444 | struct svcxprt_rdma *cma_xprt = kzalloc(sizeof *cma_xprt, GFP_KERNEL); | |
445 | ||
446 | if (!cma_xprt) | |
447 | return NULL; | |
bd4620dd | 448 | svc_xprt_init(&init_net, &svc_rdma_class, &cma_xprt->sc_xprt, serv); |
377f9b2f TT |
449 | INIT_LIST_HEAD(&cma_xprt->sc_accept_q); |
450 | INIT_LIST_HEAD(&cma_xprt->sc_dto_q); | |
451 | INIT_LIST_HEAD(&cma_xprt->sc_rq_dto_q); | |
452 | INIT_LIST_HEAD(&cma_xprt->sc_read_complete_q); | |
64be8608 | 453 | INIT_LIST_HEAD(&cma_xprt->sc_frmr_q); |
377f9b2f TT |
454 | init_waitqueue_head(&cma_xprt->sc_send_wait); |
455 | ||
456 | spin_lock_init(&cma_xprt->sc_lock); | |
377f9b2f | 457 | spin_lock_init(&cma_xprt->sc_rq_dto_lock); |
64be8608 | 458 | spin_lock_init(&cma_xprt->sc_frmr_q_lock); |
377f9b2f TT |
459 | |
460 | cma_xprt->sc_ord = svcrdma_ord; | |
461 | ||
462 | cma_xprt->sc_max_req_size = svcrdma_max_req_size; | |
463 | cma_xprt->sc_max_requests = svcrdma_max_requests; | |
464 | cma_xprt->sc_sq_depth = svcrdma_max_requests * RPCRDMA_SQ_DEPTH_MULT; | |
465 | atomic_set(&cma_xprt->sc_sq_count, 0); | |
87295b6c | 466 | atomic_set(&cma_xprt->sc_ctxt_used, 0); |
377f9b2f | 467 | |
8948896c | 468 | if (listener) |
377f9b2f TT |
469 | set_bit(XPT_LISTENER, &cma_xprt->sc_xprt.xpt_flags); |
470 | ||
471 | return cma_xprt; | |
472 | } | |
473 | ||
474 | struct page *svc_rdma_get_page(void) | |
475 | { | |
476 | struct page *page; | |
477 | ||
478 | while ((page = alloc_page(GFP_KERNEL)) == NULL) { | |
479 | /* If we can't get memory, wait a bit and try again */ | |
480 | printk(KERN_INFO "svcrdma: out of memory...retrying in 1000 " | |
481 | "jiffies.\n"); | |
482 | schedule_timeout_uninterruptible(msecs_to_jiffies(1000)); | |
483 | } | |
484 | return page; | |
485 | } | |
486 | ||
487 | int svc_rdma_post_recv(struct svcxprt_rdma *xprt) | |
488 | { | |
489 | struct ib_recv_wr recv_wr, *bad_recv_wr; | |
490 | struct svc_rdma_op_ctxt *ctxt; | |
491 | struct page *page; | |
a5abf4e8 | 492 | dma_addr_t pa; |
377f9b2f TT |
493 | int sge_no; |
494 | int buflen; | |
495 | int ret; | |
496 | ||
497 | ctxt = svc_rdma_get_context(xprt); | |
498 | buflen = 0; | |
499 | ctxt->direction = DMA_FROM_DEVICE; | |
500 | for (sge_no = 0; buflen < xprt->sc_max_req_size; sge_no++) { | |
501 | BUG_ON(sge_no >= xprt->sc_max_sge); | |
502 | page = svc_rdma_get_page(); | |
503 | ctxt->pages[sge_no] = page; | |
b432e6b3 TT |
504 | pa = ib_dma_map_page(xprt->sc_cm_id->device, |
505 | page, 0, PAGE_SIZE, | |
377f9b2f | 506 | DMA_FROM_DEVICE); |
a5abf4e8 TT |
507 | if (ib_dma_mapping_error(xprt->sc_cm_id->device, pa)) |
508 | goto err_put_ctxt; | |
509 | atomic_inc(&xprt->sc_dma_used); | |
377f9b2f TT |
510 | ctxt->sge[sge_no].addr = pa; |
511 | ctxt->sge[sge_no].length = PAGE_SIZE; | |
a5abf4e8 | 512 | ctxt->sge[sge_no].lkey = xprt->sc_dma_lkey; |
4a84386f | 513 | ctxt->count = sge_no + 1; |
377f9b2f TT |
514 | buflen += PAGE_SIZE; |
515 | } | |
377f9b2f TT |
516 | recv_wr.next = NULL; |
517 | recv_wr.sg_list = &ctxt->sge[0]; | |
518 | recv_wr.num_sge = ctxt->count; | |
519 | recv_wr.wr_id = (u64)(unsigned long)ctxt; | |
520 | ||
0905c0f0 | 521 | svc_xprt_get(&xprt->sc_xprt); |
377f9b2f | 522 | ret = ib_post_recv(xprt->sc_qp, &recv_wr, &bad_recv_wr); |
0905c0f0 | 523 | if (ret) { |
21515e46 | 524 | svc_rdma_unmap_dma(ctxt); |
05a0826a | 525 | svc_rdma_put_context(ctxt, 1); |
21515e46 | 526 | svc_xprt_put(&xprt->sc_xprt); |
0905c0f0 | 527 | } |
377f9b2f | 528 | return ret; |
a5abf4e8 TT |
529 | |
530 | err_put_ctxt: | |
4a84386f | 531 | svc_rdma_unmap_dma(ctxt); |
a5abf4e8 TT |
532 | svc_rdma_put_context(ctxt, 1); |
533 | return -ENOMEM; | |
377f9b2f TT |
534 | } |
535 | ||
536 | /* | |
537 | * This function handles the CONNECT_REQUEST event on a listening | |
538 | * endpoint. It is passed the cma_id for the _new_ connection. The context in | |
539 | * this cma_id is inherited from the listening cma_id and is the svc_xprt | |
540 | * structure for the listening endpoint. | |
541 | * | |
542 | * This function creates a new xprt for the new connection and enqueues it on | |
543 | * the accept queue for the listent xprt. When the listen thread is kicked, it | |
544 | * will call the recvfrom method on the listen xprt which will accept the new | |
545 | * connection. | |
546 | */ | |
36ef25e4 | 547 | static void handle_connect_req(struct rdma_cm_id *new_cma_id, size_t client_ird) |
377f9b2f TT |
548 | { |
549 | struct svcxprt_rdma *listen_xprt = new_cma_id->context; | |
550 | struct svcxprt_rdma *newxprt; | |
af261af4 | 551 | struct sockaddr *sa; |
377f9b2f TT |
552 | |
553 | /* Create a new transport */ | |
554 | newxprt = rdma_create_xprt(listen_xprt->sc_xprt.xpt_server, 0); | |
555 | if (!newxprt) { | |
556 | dprintk("svcrdma: failed to create new transport\n"); | |
557 | return; | |
558 | } | |
559 | newxprt->sc_cm_id = new_cma_id; | |
560 | new_cma_id->context = newxprt; | |
561 | dprintk("svcrdma: Creating newxprt=%p, cm_id=%p, listenxprt=%p\n", | |
562 | newxprt, newxprt->sc_cm_id, listen_xprt); | |
563 | ||
36ef25e4 TT |
564 | /* Save client advertised inbound read limit for use later in accept. */ |
565 | newxprt->sc_ord = client_ird; | |
566 | ||
af261af4 TT |
567 | /* Set the local and remote addresses in the transport */ |
568 | sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr; | |
569 | svc_xprt_set_remote(&newxprt->sc_xprt, sa, svc_addr_len(sa)); | |
570 | sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr; | |
571 | svc_xprt_set_local(&newxprt->sc_xprt, sa, svc_addr_len(sa)); | |
572 | ||
377f9b2f TT |
573 | /* |
574 | * Enqueue the new transport on the accept queue of the listening | |
575 | * transport | |
576 | */ | |
577 | spin_lock_bh(&listen_xprt->sc_lock); | |
578 | list_add_tail(&newxprt->sc_accept_q, &listen_xprt->sc_accept_q); | |
579 | spin_unlock_bh(&listen_xprt->sc_lock); | |
580 | ||
377f9b2f TT |
581 | set_bit(XPT_CONN, &listen_xprt->sc_xprt.xpt_flags); |
582 | svc_xprt_enqueue(&listen_xprt->sc_xprt); | |
583 | } | |
584 | ||
585 | /* | |
586 | * Handles events generated on the listening endpoint. These events will be | |
587 | * either be incoming connect requests or adapter removal events. | |
588 | */ | |
589 | static int rdma_listen_handler(struct rdma_cm_id *cma_id, | |
590 | struct rdma_cm_event *event) | |
591 | { | |
592 | struct svcxprt_rdma *xprt = cma_id->context; | |
593 | int ret = 0; | |
594 | ||
595 | switch (event->event) { | |
596 | case RDMA_CM_EVENT_CONNECT_REQUEST: | |
597 | dprintk("svcrdma: Connect request on cma_id=%p, xprt = %p, " | |
598 | "event=%d\n", cma_id, cma_id->context, event->event); | |
36ef25e4 | 599 | handle_connect_req(cma_id, |
67080c82 | 600 | event->param.conn.initiator_depth); |
377f9b2f TT |
601 | break; |
602 | ||
603 | case RDMA_CM_EVENT_ESTABLISHED: | |
604 | /* Accept complete */ | |
605 | dprintk("svcrdma: Connection completed on LISTEN xprt=%p, " | |
606 | "cm_id=%p\n", xprt, cma_id); | |
607 | break; | |
608 | ||
609 | case RDMA_CM_EVENT_DEVICE_REMOVAL: | |
610 | dprintk("svcrdma: Device removal xprt=%p, cm_id=%p\n", | |
611 | xprt, cma_id); | |
612 | if (xprt) | |
613 | set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags); | |
614 | break; | |
615 | ||
616 | default: | |
617 | dprintk("svcrdma: Unexpected event on listening endpoint %p, " | |
618 | "event=%d\n", cma_id, event->event); | |
619 | break; | |
620 | } | |
621 | ||
622 | return ret; | |
623 | } | |
624 | ||
625 | static int rdma_cma_handler(struct rdma_cm_id *cma_id, | |
626 | struct rdma_cm_event *event) | |
627 | { | |
628 | struct svc_xprt *xprt = cma_id->context; | |
629 | struct svcxprt_rdma *rdma = | |
630 | container_of(xprt, struct svcxprt_rdma, sc_xprt); | |
631 | switch (event->event) { | |
632 | case RDMA_CM_EVENT_ESTABLISHED: | |
633 | /* Accept complete */ | |
c48cbb40 | 634 | svc_xprt_get(xprt); |
377f9b2f TT |
635 | dprintk("svcrdma: Connection completed on DTO xprt=%p, " |
636 | "cm_id=%p\n", xprt, cma_id); | |
637 | clear_bit(RDMAXPRT_CONN_PENDING, &rdma->sc_flags); | |
638 | svc_xprt_enqueue(xprt); | |
639 | break; | |
640 | case RDMA_CM_EVENT_DISCONNECTED: | |
641 | dprintk("svcrdma: Disconnect on DTO xprt=%p, cm_id=%p\n", | |
642 | xprt, cma_id); | |
643 | if (xprt) { | |
644 | set_bit(XPT_CLOSE, &xprt->xpt_flags); | |
645 | svc_xprt_enqueue(xprt); | |
120693d1 | 646 | svc_xprt_put(xprt); |
377f9b2f TT |
647 | } |
648 | break; | |
649 | case RDMA_CM_EVENT_DEVICE_REMOVAL: | |
650 | dprintk("svcrdma: Device removal cma_id=%p, xprt = %p, " | |
651 | "event=%d\n", cma_id, xprt, event->event); | |
652 | if (xprt) { | |
653 | set_bit(XPT_CLOSE, &xprt->xpt_flags); | |
654 | svc_xprt_enqueue(xprt); | |
655 | } | |
656 | break; | |
657 | default: | |
658 | dprintk("svcrdma: Unexpected event on DTO endpoint %p, " | |
659 | "event=%d\n", cma_id, event->event); | |
660 | break; | |
661 | } | |
662 | return 0; | |
663 | } | |
664 | ||
665 | /* | |
666 | * Create a listening RDMA service endpoint. | |
667 | */ | |
668 | static struct svc_xprt *svc_rdma_create(struct svc_serv *serv, | |
62832c03 | 669 | struct net *net, |
377f9b2f TT |
670 | struct sockaddr *sa, int salen, |
671 | int flags) | |
672 | { | |
673 | struct rdma_cm_id *listen_id; | |
674 | struct svcxprt_rdma *cma_xprt; | |
675 | struct svc_xprt *xprt; | |
676 | int ret; | |
677 | ||
678 | dprintk("svcrdma: Creating RDMA socket\n"); | |
bade732a TT |
679 | if (sa->sa_family != AF_INET) { |
680 | dprintk("svcrdma: Address family %d is not supported.\n", sa->sa_family); | |
681 | return ERR_PTR(-EAFNOSUPPORT); | |
682 | } | |
377f9b2f TT |
683 | cma_xprt = rdma_create_xprt(serv, 1); |
684 | if (!cma_xprt) | |
58e8f621 | 685 | return ERR_PTR(-ENOMEM); |
377f9b2f TT |
686 | xprt = &cma_xprt->sc_xprt; |
687 | ||
b26f9b99 SH |
688 | listen_id = rdma_create_id(rdma_listen_handler, cma_xprt, RDMA_PS_TCP, |
689 | IB_QPT_RC); | |
377f9b2f | 690 | if (IS_ERR(listen_id)) { |
58e8f621 TT |
691 | ret = PTR_ERR(listen_id); |
692 | dprintk("svcrdma: rdma_create_id failed = %d\n", ret); | |
693 | goto err0; | |
377f9b2f | 694 | } |
58e8f621 | 695 | |
377f9b2f TT |
696 | ret = rdma_bind_addr(listen_id, sa); |
697 | if (ret) { | |
377f9b2f | 698 | dprintk("svcrdma: rdma_bind_addr failed = %d\n", ret); |
58e8f621 | 699 | goto err1; |
377f9b2f TT |
700 | } |
701 | cma_xprt->sc_cm_id = listen_id; | |
702 | ||
703 | ret = rdma_listen(listen_id, RPCRDMA_LISTEN_BACKLOG); | |
704 | if (ret) { | |
377f9b2f | 705 | dprintk("svcrdma: rdma_listen failed = %d\n", ret); |
58e8f621 | 706 | goto err1; |
377f9b2f TT |
707 | } |
708 | ||
709 | /* | |
710 | * We need to use the address from the cm_id in case the | |
711 | * caller specified 0 for the port number. | |
712 | */ | |
713 | sa = (struct sockaddr *)&cma_xprt->sc_cm_id->route.addr.src_addr; | |
714 | svc_xprt_set_local(&cma_xprt->sc_xprt, sa, salen); | |
715 | ||
716 | return &cma_xprt->sc_xprt; | |
58e8f621 TT |
717 | |
718 | err1: | |
719 | rdma_destroy_id(listen_id); | |
720 | err0: | |
721 | kfree(cma_xprt); | |
722 | return ERR_PTR(ret); | |
377f9b2f TT |
723 | } |
724 | ||
64be8608 TT |
725 | static struct svc_rdma_fastreg_mr *rdma_alloc_frmr(struct svcxprt_rdma *xprt) |
726 | { | |
727 | struct ib_mr *mr; | |
728 | struct ib_fast_reg_page_list *pl; | |
729 | struct svc_rdma_fastreg_mr *frmr; | |
730 | ||
731 | frmr = kmalloc(sizeof(*frmr), GFP_KERNEL); | |
732 | if (!frmr) | |
733 | goto err; | |
734 | ||
735 | mr = ib_alloc_fast_reg_mr(xprt->sc_pd, RPCSVC_MAXPAGES); | |
846d8e7c | 736 | if (IS_ERR(mr)) |
64be8608 TT |
737 | goto err_free_frmr; |
738 | ||
739 | pl = ib_alloc_fast_reg_page_list(xprt->sc_cm_id->device, | |
740 | RPCSVC_MAXPAGES); | |
846d8e7c | 741 | if (IS_ERR(pl)) |
64be8608 TT |
742 | goto err_free_mr; |
743 | ||
744 | frmr->mr = mr; | |
745 | frmr->page_list = pl; | |
746 | INIT_LIST_HEAD(&frmr->frmr_list); | |
747 | return frmr; | |
748 | ||
749 | err_free_mr: | |
750 | ib_dereg_mr(mr); | |
751 | err_free_frmr: | |
752 | kfree(frmr); | |
753 | err: | |
754 | return ERR_PTR(-ENOMEM); | |
755 | } | |
756 | ||
757 | static void rdma_dealloc_frmr_q(struct svcxprt_rdma *xprt) | |
758 | { | |
759 | struct svc_rdma_fastreg_mr *frmr; | |
760 | ||
761 | while (!list_empty(&xprt->sc_frmr_q)) { | |
762 | frmr = list_entry(xprt->sc_frmr_q.next, | |
763 | struct svc_rdma_fastreg_mr, frmr_list); | |
764 | list_del_init(&frmr->frmr_list); | |
765 | ib_dereg_mr(frmr->mr); | |
766 | ib_free_fast_reg_page_list(frmr->page_list); | |
767 | kfree(frmr); | |
768 | } | |
769 | } | |
770 | ||
771 | struct svc_rdma_fastreg_mr *svc_rdma_get_frmr(struct svcxprt_rdma *rdma) | |
772 | { | |
773 | struct svc_rdma_fastreg_mr *frmr = NULL; | |
774 | ||
775 | spin_lock_bh(&rdma->sc_frmr_q_lock); | |
776 | if (!list_empty(&rdma->sc_frmr_q)) { | |
777 | frmr = list_entry(rdma->sc_frmr_q.next, | |
778 | struct svc_rdma_fastreg_mr, frmr_list); | |
779 | list_del_init(&frmr->frmr_list); | |
780 | frmr->map_len = 0; | |
781 | frmr->page_list_len = 0; | |
782 | } | |
783 | spin_unlock_bh(&rdma->sc_frmr_q_lock); | |
784 | if (frmr) | |
785 | return frmr; | |
786 | ||
787 | return rdma_alloc_frmr(rdma); | |
788 | } | |
789 | ||
790 | static void frmr_unmap_dma(struct svcxprt_rdma *xprt, | |
791 | struct svc_rdma_fastreg_mr *frmr) | |
792 | { | |
793 | int page_no; | |
794 | for (page_no = 0; page_no < frmr->page_list_len; page_no++) { | |
795 | dma_addr_t addr = frmr->page_list->page_list[page_no]; | |
796 | if (ib_dma_mapping_error(frmr->mr->device, addr)) | |
797 | continue; | |
798 | atomic_dec(&xprt->sc_dma_used); | |
b432e6b3 TT |
799 | ib_dma_unmap_page(frmr->mr->device, addr, PAGE_SIZE, |
800 | frmr->direction); | |
64be8608 TT |
801 | } |
802 | } | |
803 | ||
804 | void svc_rdma_put_frmr(struct svcxprt_rdma *rdma, | |
805 | struct svc_rdma_fastreg_mr *frmr) | |
806 | { | |
807 | if (frmr) { | |
808 | frmr_unmap_dma(rdma, frmr); | |
809 | spin_lock_bh(&rdma->sc_frmr_q_lock); | |
810 | BUG_ON(!list_empty(&frmr->frmr_list)); | |
811 | list_add(&frmr->frmr_list, &rdma->sc_frmr_q); | |
812 | spin_unlock_bh(&rdma->sc_frmr_q_lock); | |
813 | } | |
814 | } | |
815 | ||
377f9b2f TT |
816 | /* |
817 | * This is the xpo_recvfrom function for listening endpoints. Its | |
818 | * purpose is to accept incoming connections. The CMA callback handler | |
819 | * has already created a new transport and attached it to the new CMA | |
820 | * ID. | |
821 | * | |
822 | * There is a queue of pending connections hung on the listening | |
823 | * transport. This queue contains the new svc_xprt structure. This | |
824 | * function takes svc_xprt structures off the accept_q and completes | |
825 | * the connection. | |
826 | */ | |
827 | static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt) | |
828 | { | |
829 | struct svcxprt_rdma *listen_rdma; | |
830 | struct svcxprt_rdma *newxprt = NULL; | |
831 | struct rdma_conn_param conn_param; | |
832 | struct ib_qp_init_attr qp_attr; | |
833 | struct ib_device_attr devattr; | |
ed72b9c6 | 834 | int uninitialized_var(dma_mr_acc); |
3a5c6380 | 835 | int need_dma_mr; |
377f9b2f TT |
836 | int ret; |
837 | int i; | |
838 | ||
839 | listen_rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt); | |
840 | clear_bit(XPT_CONN, &xprt->xpt_flags); | |
841 | /* Get the next entry off the accept list */ | |
842 | spin_lock_bh(&listen_rdma->sc_lock); | |
843 | if (!list_empty(&listen_rdma->sc_accept_q)) { | |
844 | newxprt = list_entry(listen_rdma->sc_accept_q.next, | |
845 | struct svcxprt_rdma, sc_accept_q); | |
846 | list_del_init(&newxprt->sc_accept_q); | |
847 | } | |
848 | if (!list_empty(&listen_rdma->sc_accept_q)) | |
849 | set_bit(XPT_CONN, &listen_rdma->sc_xprt.xpt_flags); | |
850 | spin_unlock_bh(&listen_rdma->sc_lock); | |
851 | if (!newxprt) | |
852 | return NULL; | |
853 | ||
854 | dprintk("svcrdma: newxprt from accept queue = %p, cm_id=%p\n", | |
855 | newxprt, newxprt->sc_cm_id); | |
856 | ||
857 | ret = ib_query_device(newxprt->sc_cm_id->device, &devattr); | |
858 | if (ret) { | |
859 | dprintk("svcrdma: could not query device attributes on " | |
860 | "device %p, rc=%d\n", newxprt->sc_cm_id->device, ret); | |
861 | goto errout; | |
862 | } | |
863 | ||
864 | /* Qualify the transport resource defaults with the | |
865 | * capabilities of this particular device */ | |
866 | newxprt->sc_max_sge = min((size_t)devattr.max_sge, | |
867 | (size_t)RPCSVC_MAXPAGES); | |
868 | newxprt->sc_max_requests = min((size_t)devattr.max_qp_wr, | |
869 | (size_t)svcrdma_max_requests); | |
870 | newxprt->sc_sq_depth = RPCRDMA_SQ_DEPTH_MULT * newxprt->sc_max_requests; | |
871 | ||
36ef25e4 TT |
872 | /* |
873 | * Limit ORD based on client limit, local device limit, and | |
874 | * configured svcrdma limit. | |
875 | */ | |
876 | newxprt->sc_ord = min_t(size_t, devattr.max_qp_rd_atom, newxprt->sc_ord); | |
877 | newxprt->sc_ord = min_t(size_t, svcrdma_ord, newxprt->sc_ord); | |
377f9b2f TT |
878 | |
879 | newxprt->sc_pd = ib_alloc_pd(newxprt->sc_cm_id->device); | |
880 | if (IS_ERR(newxprt->sc_pd)) { | |
881 | dprintk("svcrdma: error creating PD for connect request\n"); | |
882 | goto errout; | |
883 | } | |
884 | newxprt->sc_sq_cq = ib_create_cq(newxprt->sc_cm_id->device, | |
885 | sq_comp_handler, | |
886 | cq_event_handler, | |
887 | newxprt, | |
888 | newxprt->sc_sq_depth, | |
889 | 0); | |
890 | if (IS_ERR(newxprt->sc_sq_cq)) { | |
891 | dprintk("svcrdma: error creating SQ CQ for connect request\n"); | |
892 | goto errout; | |
893 | } | |
894 | newxprt->sc_rq_cq = ib_create_cq(newxprt->sc_cm_id->device, | |
895 | rq_comp_handler, | |
896 | cq_event_handler, | |
897 | newxprt, | |
898 | newxprt->sc_max_requests, | |
899 | 0); | |
900 | if (IS_ERR(newxprt->sc_rq_cq)) { | |
901 | dprintk("svcrdma: error creating RQ CQ for connect request\n"); | |
902 | goto errout; | |
903 | } | |
904 | ||
905 | memset(&qp_attr, 0, sizeof qp_attr); | |
906 | qp_attr.event_handler = qp_event_handler; | |
907 | qp_attr.qp_context = &newxprt->sc_xprt; | |
908 | qp_attr.cap.max_send_wr = newxprt->sc_sq_depth; | |
909 | qp_attr.cap.max_recv_wr = newxprt->sc_max_requests; | |
910 | qp_attr.cap.max_send_sge = newxprt->sc_max_sge; | |
911 | qp_attr.cap.max_recv_sge = newxprt->sc_max_sge; | |
912 | qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR; | |
913 | qp_attr.qp_type = IB_QPT_RC; | |
914 | qp_attr.send_cq = newxprt->sc_sq_cq; | |
915 | qp_attr.recv_cq = newxprt->sc_rq_cq; | |
916 | dprintk("svcrdma: newxprt->sc_cm_id=%p, newxprt->sc_pd=%p\n" | |
917 | " cm_id->device=%p, sc_pd->device=%p\n" | |
918 | " cap.max_send_wr = %d\n" | |
919 | " cap.max_recv_wr = %d\n" | |
920 | " cap.max_send_sge = %d\n" | |
921 | " cap.max_recv_sge = %d\n", | |
922 | newxprt->sc_cm_id, newxprt->sc_pd, | |
923 | newxprt->sc_cm_id->device, newxprt->sc_pd->device, | |
924 | qp_attr.cap.max_send_wr, | |
925 | qp_attr.cap.max_recv_wr, | |
926 | qp_attr.cap.max_send_sge, | |
927 | qp_attr.cap.max_recv_sge); | |
928 | ||
929 | ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd, &qp_attr); | |
930 | if (ret) { | |
931 | /* | |
932 | * XXX: This is a hack. We need a xx_request_qp interface | |
933 | * that will adjust the qp_attr's with a best-effort | |
934 | * number | |
935 | */ | |
936 | qp_attr.cap.max_send_sge -= 2; | |
937 | qp_attr.cap.max_recv_sge -= 2; | |
938 | ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd, | |
939 | &qp_attr); | |
940 | if (ret) { | |
941 | dprintk("svcrdma: failed to create QP, ret=%d\n", ret); | |
942 | goto errout; | |
943 | } | |
944 | newxprt->sc_max_sge = qp_attr.cap.max_send_sge; | |
945 | newxprt->sc_max_sge = qp_attr.cap.max_recv_sge; | |
946 | newxprt->sc_sq_depth = qp_attr.cap.max_send_wr; | |
947 | newxprt->sc_max_requests = qp_attr.cap.max_recv_wr; | |
948 | } | |
949 | newxprt->sc_qp = newxprt->sc_cm_id->qp; | |
950 | ||
3a5c6380 TT |
951 | /* |
952 | * Use the most secure set of MR resources based on the | |
953 | * transport type and available memory management features in | |
954 | * the device. Here's the table implemented below: | |
955 | * | |
956 | * Fast Global DMA Remote WR | |
957 | * Reg LKEY MR Access | |
958 | * Sup'd Sup'd Needed Needed | |
959 | * | |
960 | * IWARP N N Y Y | |
961 | * N Y Y Y | |
962 | * Y N Y N | |
963 | * Y Y N - | |
964 | * | |
965 | * IB N N Y N | |
966 | * N Y N - | |
967 | * Y N Y N | |
968 | * Y Y N - | |
969 | * | |
970 | * NB: iWARP requires remote write access for the data sink | |
971 | * of an RDMA_READ. IB does not. | |
972 | */ | |
973 | if (devattr.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) { | |
974 | newxprt->sc_frmr_pg_list_len = | |
975 | devattr.max_fast_reg_page_list_len; | |
976 | newxprt->sc_dev_caps |= SVCRDMA_DEVCAP_FAST_REG; | |
977 | } | |
978 | ||
979 | /* | |
980 | * Determine if a DMA MR is required and if so, what privs are required | |
981 | */ | |
982 | switch (rdma_node_get_transport(newxprt->sc_cm_id->device->node_type)) { | |
983 | case RDMA_TRANSPORT_IWARP: | |
984 | newxprt->sc_dev_caps |= SVCRDMA_DEVCAP_READ_W_INV; | |
985 | if (!(newxprt->sc_dev_caps & SVCRDMA_DEVCAP_FAST_REG)) { | |
986 | need_dma_mr = 1; | |
987 | dma_mr_acc = | |
988 | (IB_ACCESS_LOCAL_WRITE | | |
989 | IB_ACCESS_REMOTE_WRITE); | |
990 | } else if (!(devattr.device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY)) { | |
991 | need_dma_mr = 1; | |
992 | dma_mr_acc = IB_ACCESS_LOCAL_WRITE; | |
993 | } else | |
994 | need_dma_mr = 0; | |
995 | break; | |
996 | case RDMA_TRANSPORT_IB: | |
997 | if (!(devattr.device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY)) { | |
998 | need_dma_mr = 1; | |
999 | dma_mr_acc = IB_ACCESS_LOCAL_WRITE; | |
1000 | } else | |
1001 | need_dma_mr = 0; | |
1002 | break; | |
1003 | default: | |
377f9b2f TT |
1004 | goto errout; |
1005 | } | |
1006 | ||
3a5c6380 TT |
1007 | /* Create the DMA MR if needed, otherwise, use the DMA LKEY */ |
1008 | if (need_dma_mr) { | |
1009 | /* Register all of physical memory */ | |
1010 | newxprt->sc_phys_mr = | |
1011 | ib_get_dma_mr(newxprt->sc_pd, dma_mr_acc); | |
1012 | if (IS_ERR(newxprt->sc_phys_mr)) { | |
1013 | dprintk("svcrdma: Failed to create DMA MR ret=%d\n", | |
1014 | ret); | |
1015 | goto errout; | |
1016 | } | |
1017 | newxprt->sc_dma_lkey = newxprt->sc_phys_mr->lkey; | |
1018 | } else | |
1019 | newxprt->sc_dma_lkey = | |
1020 | newxprt->sc_cm_id->device->local_dma_lkey; | |
1021 | ||
377f9b2f TT |
1022 | /* Post receive buffers */ |
1023 | for (i = 0; i < newxprt->sc_max_requests; i++) { | |
1024 | ret = svc_rdma_post_recv(newxprt); | |
1025 | if (ret) { | |
1026 | dprintk("svcrdma: failure posting receive buffers\n"); | |
1027 | goto errout; | |
1028 | } | |
1029 | } | |
1030 | ||
1031 | /* Swap out the handler */ | |
1032 | newxprt->sc_cm_id->event_handler = rdma_cma_handler; | |
1033 | ||
af261af4 TT |
1034 | /* |
1035 | * Arm the CQs for the SQ and RQ before accepting so we can't | |
1036 | * miss the first message | |
1037 | */ | |
1038 | ib_req_notify_cq(newxprt->sc_sq_cq, IB_CQ_NEXT_COMP); | |
1039 | ib_req_notify_cq(newxprt->sc_rq_cq, IB_CQ_NEXT_COMP); | |
1040 | ||
377f9b2f TT |
1041 | /* Accept Connection */ |
1042 | set_bit(RDMAXPRT_CONN_PENDING, &newxprt->sc_flags); | |
1043 | memset(&conn_param, 0, sizeof conn_param); | |
1044 | conn_param.responder_resources = 0; | |
1045 | conn_param.initiator_depth = newxprt->sc_ord; | |
1046 | ret = rdma_accept(newxprt->sc_cm_id, &conn_param); | |
1047 | if (ret) { | |
1048 | dprintk("svcrdma: failed to accept new connection, ret=%d\n", | |
1049 | ret); | |
1050 | goto errout; | |
1051 | } | |
1052 | ||
1053 | dprintk("svcrdma: new connection %p accepted with the following " | |
1054 | "attributes:\n" | |
21454aaa | 1055 | " local_ip : %pI4\n" |
377f9b2f | 1056 | " local_port : %d\n" |
21454aaa | 1057 | " remote_ip : %pI4\n" |
377f9b2f TT |
1058 | " remote_port : %d\n" |
1059 | " max_sge : %d\n" | |
1060 | " sq_depth : %d\n" | |
1061 | " max_requests : %d\n" | |
1062 | " ord : %d\n", | |
1063 | newxprt, | |
21454aaa HH |
1064 | &((struct sockaddr_in *)&newxprt->sc_cm_id-> |
1065 | route.addr.src_addr)->sin_addr.s_addr, | |
377f9b2f TT |
1066 | ntohs(((struct sockaddr_in *)&newxprt->sc_cm_id-> |
1067 | route.addr.src_addr)->sin_port), | |
21454aaa HH |
1068 | &((struct sockaddr_in *)&newxprt->sc_cm_id-> |
1069 | route.addr.dst_addr)->sin_addr.s_addr, | |
377f9b2f TT |
1070 | ntohs(((struct sockaddr_in *)&newxprt->sc_cm_id-> |
1071 | route.addr.dst_addr)->sin_port), | |
1072 | newxprt->sc_max_sge, | |
1073 | newxprt->sc_sq_depth, | |
1074 | newxprt->sc_max_requests, | |
1075 | newxprt->sc_ord); | |
1076 | ||
377f9b2f TT |
1077 | return &newxprt->sc_xprt; |
1078 | ||
1079 | errout: | |
1080 | dprintk("svcrdma: failure accepting new connection rc=%d.\n", ret); | |
c48cbb40 TT |
1081 | /* Take a reference in case the DTO handler runs */ |
1082 | svc_xprt_get(&newxprt->sc_xprt); | |
1711386c | 1083 | if (newxprt->sc_qp && !IS_ERR(newxprt->sc_qp)) |
c48cbb40 | 1084 | ib_destroy_qp(newxprt->sc_qp); |
377f9b2f | 1085 | rdma_destroy_id(newxprt->sc_cm_id); |
c48cbb40 TT |
1086 | /* This call to put will destroy the transport */ |
1087 | svc_xprt_put(&newxprt->sc_xprt); | |
377f9b2f TT |
1088 | return NULL; |
1089 | } | |
1090 | ||
377f9b2f TT |
1091 | static void svc_rdma_release_rqst(struct svc_rqst *rqstp) |
1092 | { | |
377f9b2f TT |
1093 | } |
1094 | ||
c48cbb40 | 1095 | /* |
1711386c | 1096 | * When connected, an svc_xprt has at least two references: |
c48cbb40 TT |
1097 | * |
1098 | * - A reference held by the cm_id between the ESTABLISHED and | |
1099 | * DISCONNECTED events. If the remote peer disconnected first, this | |
1100 | * reference could be gone. | |
1101 | * | |
1102 | * - A reference held by the svc_recv code that called this function | |
1103 | * as part of close processing. | |
1104 | * | |
1711386c | 1105 | * At a minimum one references should still be held. |
c48cbb40 | 1106 | */ |
377f9b2f TT |
1107 | static void svc_rdma_detach(struct svc_xprt *xprt) |
1108 | { | |
1109 | struct svcxprt_rdma *rdma = | |
1110 | container_of(xprt, struct svcxprt_rdma, sc_xprt); | |
377f9b2f | 1111 | dprintk("svc: svc_rdma_detach(%p)\n", xprt); |
c48cbb40 TT |
1112 | |
1113 | /* Disconnect and flush posted WQE */ | |
377f9b2f | 1114 | rdma_disconnect(rdma->sc_cm_id); |
377f9b2f TT |
1115 | } |
1116 | ||
8da91ea8 | 1117 | static void __svc_rdma_free(struct work_struct *work) |
377f9b2f | 1118 | { |
8da91ea8 TT |
1119 | struct svcxprt_rdma *rdma = |
1120 | container_of(work, struct svcxprt_rdma, sc_work); | |
377f9b2f | 1121 | dprintk("svcrdma: svc_rdma_free(%p)\n", rdma); |
8da91ea8 | 1122 | |
c48cbb40 | 1123 | /* We should only be called from kref_put */ |
8da91ea8 TT |
1124 | BUG_ON(atomic_read(&rdma->sc_xprt.xpt_ref.refcount) != 0); |
1125 | ||
356d0a15 TT |
1126 | /* |
1127 | * Destroy queued, but not processed read completions. Note | |
1128 | * that this cleanup has to be done before destroying the | |
1129 | * cm_id because the device ptr is needed to unmap the dma in | |
1130 | * svc_rdma_put_context. | |
1131 | */ | |
356d0a15 TT |
1132 | while (!list_empty(&rdma->sc_read_complete_q)) { |
1133 | struct svc_rdma_op_ctxt *ctxt; | |
1134 | ctxt = list_entry(rdma->sc_read_complete_q.next, | |
1135 | struct svc_rdma_op_ctxt, | |
1136 | dto_q); | |
1137 | list_del_init(&ctxt->dto_q); | |
1138 | svc_rdma_put_context(ctxt, 1); | |
1139 | } | |
356d0a15 TT |
1140 | |
1141 | /* Destroy queued, but not processed recv completions */ | |
356d0a15 TT |
1142 | while (!list_empty(&rdma->sc_rq_dto_q)) { |
1143 | struct svc_rdma_op_ctxt *ctxt; | |
1144 | ctxt = list_entry(rdma->sc_rq_dto_q.next, | |
1145 | struct svc_rdma_op_ctxt, | |
1146 | dto_q); | |
1147 | list_del_init(&ctxt->dto_q); | |
1148 | svc_rdma_put_context(ctxt, 1); | |
1149 | } | |
356d0a15 TT |
1150 | |
1151 | /* Warn if we leaked a resource or under-referenced */ | |
1152 | WARN_ON(atomic_read(&rdma->sc_ctxt_used) != 0); | |
87295b6c | 1153 | WARN_ON(atomic_read(&rdma->sc_dma_used) != 0); |
356d0a15 | 1154 | |
64be8608 TT |
1155 | /* De-allocate fastreg mr */ |
1156 | rdma_dealloc_frmr_q(rdma); | |
1157 | ||
1711386c TT |
1158 | /* Destroy the QP if present (not a listener) */ |
1159 | if (rdma->sc_qp && !IS_ERR(rdma->sc_qp)) | |
1160 | ib_destroy_qp(rdma->sc_qp); | |
1161 | ||
c48cbb40 TT |
1162 | if (rdma->sc_sq_cq && !IS_ERR(rdma->sc_sq_cq)) |
1163 | ib_destroy_cq(rdma->sc_sq_cq); | |
377f9b2f | 1164 | |
c48cbb40 TT |
1165 | if (rdma->sc_rq_cq && !IS_ERR(rdma->sc_rq_cq)) |
1166 | ib_destroy_cq(rdma->sc_rq_cq); | |
377f9b2f | 1167 | |
c48cbb40 TT |
1168 | if (rdma->sc_phys_mr && !IS_ERR(rdma->sc_phys_mr)) |
1169 | ib_dereg_mr(rdma->sc_phys_mr); | |
377f9b2f | 1170 | |
c48cbb40 TT |
1171 | if (rdma->sc_pd && !IS_ERR(rdma->sc_pd)) |
1172 | ib_dealloc_pd(rdma->sc_pd); | |
377f9b2f | 1173 | |
356d0a15 TT |
1174 | /* Destroy the CM ID */ |
1175 | rdma_destroy_id(rdma->sc_cm_id); | |
1176 | ||
c48cbb40 | 1177 | kfree(rdma); |
377f9b2f TT |
1178 | } |
1179 | ||
8da91ea8 TT |
1180 | static void svc_rdma_free(struct svc_xprt *xprt) |
1181 | { | |
1182 | struct svcxprt_rdma *rdma = | |
1183 | container_of(xprt, struct svcxprt_rdma, sc_xprt); | |
1184 | INIT_WORK(&rdma->sc_work, __svc_rdma_free); | |
a25e758c | 1185 | queue_work(svc_rdma_wq, &rdma->sc_work); |
8da91ea8 TT |
1186 | } |
1187 | ||
377f9b2f TT |
1188 | static int svc_rdma_has_wspace(struct svc_xprt *xprt) |
1189 | { | |
1190 | struct svcxprt_rdma *rdma = | |
1191 | container_of(xprt, struct svcxprt_rdma, sc_xprt); | |
1192 | ||
1193 | /* | |
1194 | * If there are fewer SQ WR available than required to send a | |
1195 | * simple response, return false. | |
1196 | */ | |
1197 | if ((rdma->sc_sq_depth - atomic_read(&rdma->sc_sq_count) < 3)) | |
1198 | return 0; | |
1199 | ||
1200 | /* | |
1201 | * ...or there are already waiters on the SQ, | |
1202 | * return false. | |
1203 | */ | |
1204 | if (waitqueue_active(&rdma->sc_send_wait)) | |
1205 | return 0; | |
1206 | ||
1207 | /* Otherwise return true. */ | |
1208 | return 1; | |
1209 | } | |
1210 | ||
e1183210 TT |
1211 | /* |
1212 | * Attempt to register the kvec representing the RPC memory with the | |
1213 | * device. | |
1214 | * | |
1215 | * Returns: | |
1216 | * NULL : The device does not support fastreg or there were no more | |
1217 | * fastreg mr. | |
1218 | * frmr : The kvec register request was successfully posted. | |
1219 | * <0 : An error was encountered attempting to register the kvec. | |
1220 | */ | |
1221 | int svc_rdma_fastreg(struct svcxprt_rdma *xprt, | |
1222 | struct svc_rdma_fastreg_mr *frmr) | |
1223 | { | |
1224 | struct ib_send_wr fastreg_wr; | |
1225 | u8 key; | |
1226 | ||
1227 | /* Bump the key */ | |
1228 | key = (u8)(frmr->mr->lkey & 0x000000FF); | |
1229 | ib_update_fast_reg_key(frmr->mr, ++key); | |
1230 | ||
1231 | /* Prepare FASTREG WR */ | |
1232 | memset(&fastreg_wr, 0, sizeof fastreg_wr); | |
1233 | fastreg_wr.opcode = IB_WR_FAST_REG_MR; | |
1234 | fastreg_wr.send_flags = IB_SEND_SIGNALED; | |
1235 | fastreg_wr.wr.fast_reg.iova_start = (unsigned long)frmr->kva; | |
1236 | fastreg_wr.wr.fast_reg.page_list = frmr->page_list; | |
1237 | fastreg_wr.wr.fast_reg.page_list_len = frmr->page_list_len; | |
1238 | fastreg_wr.wr.fast_reg.page_shift = PAGE_SHIFT; | |
1239 | fastreg_wr.wr.fast_reg.length = frmr->map_len; | |
1240 | fastreg_wr.wr.fast_reg.access_flags = frmr->access_flags; | |
1241 | fastreg_wr.wr.fast_reg.rkey = frmr->mr->lkey; | |
1242 | return svc_rdma_send(xprt, &fastreg_wr); | |
1243 | } | |
1244 | ||
377f9b2f TT |
1245 | int svc_rdma_send(struct svcxprt_rdma *xprt, struct ib_send_wr *wr) |
1246 | { | |
5b180a9a TT |
1247 | struct ib_send_wr *bad_wr, *n_wr; |
1248 | int wr_count; | |
1249 | int i; | |
377f9b2f TT |
1250 | int ret; |
1251 | ||
1252 | if (test_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags)) | |
9d6347ac | 1253 | return -ENOTCONN; |
377f9b2f TT |
1254 | |
1255 | BUG_ON(wr->send_flags != IB_SEND_SIGNALED); | |
5b180a9a TT |
1256 | wr_count = 1; |
1257 | for (n_wr = wr->next; n_wr; n_wr = n_wr->next) | |
1258 | wr_count++; | |
1259 | ||
377f9b2f TT |
1260 | /* If the SQ is full, wait until an SQ entry is available */ |
1261 | while (1) { | |
1262 | spin_lock_bh(&xprt->sc_lock); | |
5b180a9a | 1263 | if (xprt->sc_sq_depth < atomic_read(&xprt->sc_sq_count) + wr_count) { |
377f9b2f TT |
1264 | spin_unlock_bh(&xprt->sc_lock); |
1265 | atomic_inc(&rdma_stat_sq_starve); | |
dbcd00eb TT |
1266 | |
1267 | /* See if we can opportunistically reap SQ WR to make room */ | |
377f9b2f TT |
1268 | sq_cq_reap(xprt); |
1269 | ||
1270 | /* Wait until SQ WR available if SQ still full */ | |
1271 | wait_event(xprt->sc_send_wait, | |
1272 | atomic_read(&xprt->sc_sq_count) < | |
1273 | xprt->sc_sq_depth); | |
830bb59b | 1274 | if (test_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags)) |
b432e6b3 | 1275 | return -ENOTCONN; |
377f9b2f TT |
1276 | continue; |
1277 | } | |
5b180a9a TT |
1278 | /* Take a transport ref for each WR posted */ |
1279 | for (i = 0; i < wr_count; i++) | |
1280 | svc_xprt_get(&xprt->sc_xprt); | |
1281 | ||
1282 | /* Bump used SQ WR count and post */ | |
1283 | atomic_add(wr_count, &xprt->sc_sq_count); | |
377f9b2f | 1284 | ret = ib_post_send(xprt->sc_qp, wr, &bad_wr); |
5b180a9a TT |
1285 | if (ret) { |
1286 | set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags); | |
1287 | atomic_sub(wr_count, &xprt->sc_sq_count); | |
1288 | for (i = 0; i < wr_count; i ++) | |
1289 | svc_xprt_put(&xprt->sc_xprt); | |
377f9b2f TT |
1290 | dprintk("svcrdma: failed to post SQ WR rc=%d, " |
1291 | "sc_sq_count=%d, sc_sq_depth=%d\n", | |
1292 | ret, atomic_read(&xprt->sc_sq_count), | |
1293 | xprt->sc_sq_depth); | |
0905c0f0 | 1294 | } |
377f9b2f | 1295 | spin_unlock_bh(&xprt->sc_lock); |
5b180a9a TT |
1296 | if (ret) |
1297 | wake_up(&xprt->sc_send_wait); | |
377f9b2f TT |
1298 | break; |
1299 | } | |
1300 | return ret; | |
1301 | } | |
1302 | ||
008fdbc5 TT |
1303 | void svc_rdma_send_error(struct svcxprt_rdma *xprt, struct rpcrdma_msg *rmsgp, |
1304 | enum rpcrdma_errcode err) | |
377f9b2f TT |
1305 | { |
1306 | struct ib_send_wr err_wr; | |
377f9b2f TT |
1307 | struct page *p; |
1308 | struct svc_rdma_op_ctxt *ctxt; | |
1309 | u32 *va; | |
1310 | int length; | |
1311 | int ret; | |
1312 | ||
1313 | p = svc_rdma_get_page(); | |
1314 | va = page_address(p); | |
1315 | ||
1316 | /* XDR encode error */ | |
1317 | length = svc_rdma_xdr_encode_error(xprt, rmsgp, err, va); | |
1318 | ||
4a84386f TT |
1319 | ctxt = svc_rdma_get_context(xprt); |
1320 | ctxt->direction = DMA_FROM_DEVICE; | |
1321 | ctxt->count = 1; | |
1322 | ctxt->pages[0] = p; | |
1323 | ||
377f9b2f | 1324 | /* Prepare SGE for local address */ |
4a84386f TT |
1325 | ctxt->sge[0].addr = ib_dma_map_page(xprt->sc_cm_id->device, |
1326 | p, 0, length, DMA_FROM_DEVICE); | |
1327 | if (ib_dma_mapping_error(xprt->sc_cm_id->device, ctxt->sge[0].addr)) { | |
04911b53 | 1328 | put_page(p); |
a5e50268 | 1329 | svc_rdma_put_context(ctxt, 1); |
04911b53 TT |
1330 | return; |
1331 | } | |
1332 | atomic_inc(&xprt->sc_dma_used); | |
4a84386f TT |
1333 | ctxt->sge[0].lkey = xprt->sc_dma_lkey; |
1334 | ctxt->sge[0].length = length; | |
377f9b2f TT |
1335 | |
1336 | /* Prepare SEND WR */ | |
1337 | memset(&err_wr, 0, sizeof err_wr); | |
1338 | ctxt->wr_op = IB_WR_SEND; | |
1339 | err_wr.wr_id = (unsigned long)ctxt; | |
4a84386f | 1340 | err_wr.sg_list = ctxt->sge; |
377f9b2f TT |
1341 | err_wr.num_sge = 1; |
1342 | err_wr.opcode = IB_WR_SEND; | |
1343 | err_wr.send_flags = IB_SEND_SIGNALED; | |
1344 | ||
1345 | /* Post It */ | |
1346 | ret = svc_rdma_send(xprt, &err_wr); | |
1347 | if (ret) { | |
008fdbc5 TT |
1348 | dprintk("svcrdma: Error %d posting send for protocol error\n", |
1349 | ret); | |
4a84386f | 1350 | svc_rdma_unmap_dma(ctxt); |
377f9b2f TT |
1351 | svc_rdma_put_context(ctxt, 1); |
1352 | } | |
377f9b2f | 1353 | } |