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, | |
cc9a903d | 94 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_RDMA, |
3c45ddf8 | 95 | .xcl_ident = XPRT_TRANSPORT_RDMA, |
377f9b2f TT |
96 | }; |
97 | ||
377f9b2f TT |
98 | struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt) |
99 | { | |
100 | struct svc_rdma_op_ctxt *ctxt; | |
101 | ||
b7e0b9a9 CL |
102 | ctxt = kmem_cache_alloc(svc_rdma_ctxt_cachep, |
103 | GFP_KERNEL | __GFP_NOFAIL); | |
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 | ||
377f9b2f TT |
138 | xprt = ctxt->xprt; |
139 | if (free_pages) | |
140 | for (i = 0; i < ctxt->count; i++) | |
141 | put_page(ctxt->pages[i]); | |
142 | ||
8948896c | 143 | kmem_cache_free(svc_rdma_ctxt_cachep, ctxt); |
87407673 | 144 | atomic_dec(&xprt->sc_ctxt_used); |
377f9b2f TT |
145 | } |
146 | ||
ab96dddb TT |
147 | /* |
148 | * Temporary NFS req mappings are shared across all transport | |
149 | * instances. These are short lived and should be bounded by the number | |
150 | * of concurrent server threads * depth of the SQ. | |
151 | */ | |
152 | struct svc_rdma_req_map *svc_rdma_get_req_map(void) | |
153 | { | |
154 | struct svc_rdma_req_map *map; | |
b7e0b9a9 CL |
155 | map = kmem_cache_alloc(svc_rdma_map_cachep, |
156 | GFP_KERNEL | __GFP_NOFAIL); | |
ab96dddb TT |
157 | map->count = 0; |
158 | return map; | |
159 | } | |
160 | ||
161 | void svc_rdma_put_req_map(struct svc_rdma_req_map *map) | |
162 | { | |
163 | kmem_cache_free(svc_rdma_map_cachep, map); | |
164 | } | |
165 | ||
377f9b2f TT |
166 | /* ib_cq event handler */ |
167 | static void cq_event_handler(struct ib_event *event, void *context) | |
168 | { | |
169 | struct svc_xprt *xprt = context; | |
76357c71 SG |
170 | dprintk("svcrdma: received CQ event %s (%d), context=%p\n", |
171 | ib_event_msg(event->event), event->event, context); | |
377f9b2f TT |
172 | set_bit(XPT_CLOSE, &xprt->xpt_flags); |
173 | } | |
174 | ||
175 | /* QP event handler */ | |
176 | static void qp_event_handler(struct ib_event *event, void *context) | |
177 | { | |
178 | struct svc_xprt *xprt = context; | |
179 | ||
180 | switch (event->event) { | |
181 | /* These are considered benign events */ | |
182 | case IB_EVENT_PATH_MIG: | |
183 | case IB_EVENT_COMM_EST: | |
184 | case IB_EVENT_SQ_DRAINED: | |
185 | case IB_EVENT_QP_LAST_WQE_REACHED: | |
76357c71 SG |
186 | dprintk("svcrdma: QP event %s (%d) received for QP=%p\n", |
187 | ib_event_msg(event->event), event->event, | |
188 | event->element.qp); | |
377f9b2f TT |
189 | break; |
190 | /* These are considered fatal events */ | |
191 | case IB_EVENT_PATH_MIG_ERR: | |
192 | case IB_EVENT_QP_FATAL: | |
193 | case IB_EVENT_QP_REQ_ERR: | |
194 | case IB_EVENT_QP_ACCESS_ERR: | |
195 | case IB_EVENT_DEVICE_FATAL: | |
196 | default: | |
76357c71 | 197 | dprintk("svcrdma: QP ERROR event %s (%d) received for QP=%p, " |
377f9b2f | 198 | "closing transport\n", |
76357c71 SG |
199 | ib_event_msg(event->event), event->event, |
200 | event->element.qp); | |
377f9b2f TT |
201 | set_bit(XPT_CLOSE, &xprt->xpt_flags); |
202 | break; | |
203 | } | |
204 | } | |
205 | ||
206 | /* | |
207 | * Data Transfer Operation Tasklet | |
208 | * | |
209 | * Walks a list of transports with I/O pending, removing entries as | |
210 | * they are added to the server's I/O pending list. Two bits indicate | |
211 | * if SQ, RQ, or both have I/O pending. The dto_lock is an irqsave | |
212 | * spinlock that serializes access to the transport list with the RQ | |
213 | * and SQ interrupt handlers. | |
214 | */ | |
215 | static void dto_tasklet_func(unsigned long data) | |
216 | { | |
217 | struct svcxprt_rdma *xprt; | |
218 | unsigned long flags; | |
219 | ||
220 | spin_lock_irqsave(&dto_lock, flags); | |
221 | while (!list_empty(&dto_xprt_q)) { | |
222 | xprt = list_entry(dto_xprt_q.next, | |
223 | struct svcxprt_rdma, sc_dto_q); | |
224 | list_del_init(&xprt->sc_dto_q); | |
225 | spin_unlock_irqrestore(&dto_lock, flags); | |
226 | ||
dbcd00eb TT |
227 | rq_cq_reap(xprt); |
228 | sq_cq_reap(xprt); | |
377f9b2f | 229 | |
c48cbb40 | 230 | svc_xprt_put(&xprt->sc_xprt); |
377f9b2f TT |
231 | spin_lock_irqsave(&dto_lock, flags); |
232 | } | |
233 | spin_unlock_irqrestore(&dto_lock, flags); | |
234 | } | |
235 | ||
236 | /* | |
237 | * Receive Queue Completion Handler | |
238 | * | |
239 | * Since an RQ completion handler is called on interrupt context, we | |
240 | * need to defer the handling of the I/O to a tasklet | |
241 | */ | |
242 | static void rq_comp_handler(struct ib_cq *cq, void *cq_context) | |
243 | { | |
244 | struct svcxprt_rdma *xprt = cq_context; | |
245 | unsigned long flags; | |
246 | ||
1711386c TT |
247 | /* Guard against unconditional flush call for destroyed QP */ |
248 | if (atomic_read(&xprt->sc_xprt.xpt_ref.refcount)==0) | |
249 | return; | |
250 | ||
377f9b2f TT |
251 | /* |
252 | * Set the bit regardless of whether or not it's on the list | |
253 | * because it may be on the list already due to an SQ | |
254 | * completion. | |
1711386c | 255 | */ |
377f9b2f TT |
256 | set_bit(RDMAXPRT_RQ_PENDING, &xprt->sc_flags); |
257 | ||
258 | /* | |
259 | * If this transport is not already on the DTO transport queue, | |
260 | * add it | |
261 | */ | |
262 | spin_lock_irqsave(&dto_lock, flags); | |
c48cbb40 TT |
263 | if (list_empty(&xprt->sc_dto_q)) { |
264 | svc_xprt_get(&xprt->sc_xprt); | |
377f9b2f | 265 | list_add_tail(&xprt->sc_dto_q, &dto_xprt_q); |
c48cbb40 | 266 | } |
377f9b2f TT |
267 | spin_unlock_irqrestore(&dto_lock, flags); |
268 | ||
269 | /* Tasklet does all the work to avoid irqsave locks. */ | |
270 | tasklet_schedule(&dto_tasklet); | |
271 | } | |
272 | ||
273 | /* | |
274 | * rq_cq_reap - Process the RQ CQ. | |
275 | * | |
276 | * Take all completing WC off the CQE and enqueue the associated DTO | |
277 | * context on the dto_q for the transport. | |
0905c0f0 TT |
278 | * |
279 | * Note that caller must hold a transport reference. | |
377f9b2f TT |
280 | */ |
281 | static void rq_cq_reap(struct svcxprt_rdma *xprt) | |
282 | { | |
283 | int ret; | |
284 | struct ib_wc wc; | |
285 | struct svc_rdma_op_ctxt *ctxt = NULL; | |
286 | ||
dbcd00eb TT |
287 | if (!test_and_clear_bit(RDMAXPRT_RQ_PENDING, &xprt->sc_flags)) |
288 | return; | |
289 | ||
290 | ib_req_notify_cq(xprt->sc_rq_cq, IB_CQ_NEXT_COMP); | |
377f9b2f TT |
291 | atomic_inc(&rdma_stat_rq_poll); |
292 | ||
377f9b2f TT |
293 | while ((ret = ib_poll_cq(xprt->sc_rq_cq, 1, &wc)) > 0) { |
294 | ctxt = (struct svc_rdma_op_ctxt *)(unsigned long)wc.wr_id; | |
295 | ctxt->wc_status = wc.status; | |
296 | ctxt->byte_len = wc.byte_len; | |
e6ab9143 | 297 | svc_rdma_unmap_dma(ctxt); |
377f9b2f TT |
298 | if (wc.status != IB_WC_SUCCESS) { |
299 | /* Close the transport */ | |
0905c0f0 | 300 | dprintk("svcrdma: transport closing putting ctxt %p\n", ctxt); |
377f9b2f TT |
301 | set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags); |
302 | svc_rdma_put_context(ctxt, 1); | |
0905c0f0 | 303 | svc_xprt_put(&xprt->sc_xprt); |
377f9b2f TT |
304 | continue; |
305 | } | |
47698e08 | 306 | spin_lock_bh(&xprt->sc_rq_dto_lock); |
377f9b2f | 307 | list_add_tail(&ctxt->dto_q, &xprt->sc_rq_dto_q); |
47698e08 | 308 | spin_unlock_bh(&xprt->sc_rq_dto_lock); |
0905c0f0 | 309 | svc_xprt_put(&xprt->sc_xprt); |
377f9b2f | 310 | } |
377f9b2f TT |
311 | |
312 | if (ctxt) | |
313 | atomic_inc(&rdma_stat_rq_prod); | |
dbcd00eb TT |
314 | |
315 | set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags); | |
316 | /* | |
317 | * If data arrived before established event, | |
318 | * don't enqueue. This defers RPC I/O until the | |
319 | * RDMA connection is complete. | |
320 | */ | |
321 | if (!test_bit(RDMAXPRT_CONN_PENDING, &xprt->sc_flags)) | |
322 | svc_xprt_enqueue(&xprt->sc_xprt); | |
377f9b2f TT |
323 | } |
324 | ||
e1183210 | 325 | /* |
70f23fd6 | 326 | * Process a completion context |
e1183210 TT |
327 | */ |
328 | static void process_context(struct svcxprt_rdma *xprt, | |
329 | struct svc_rdma_op_ctxt *ctxt) | |
330 | { | |
331 | svc_rdma_unmap_dma(ctxt); | |
332 | ||
333 | switch (ctxt->wr_op) { | |
334 | case IB_WR_SEND: | |
3fe04ee9 CL |
335 | if (ctxt->frmr) |
336 | pr_err("svcrdma: SEND: ctxt->frmr != NULL\n"); | |
e1183210 TT |
337 | svc_rdma_put_context(ctxt, 1); |
338 | break; | |
339 | ||
340 | case IB_WR_RDMA_WRITE: | |
3fe04ee9 CL |
341 | if (ctxt->frmr) |
342 | pr_err("svcrdma: WRITE: ctxt->frmr != NULL\n"); | |
e1183210 TT |
343 | svc_rdma_put_context(ctxt, 0); |
344 | break; | |
345 | ||
346 | case IB_WR_RDMA_READ: | |
146b6df6 | 347 | case IB_WR_RDMA_READ_WITH_INV: |
0bf48289 | 348 | svc_rdma_put_frmr(xprt, ctxt->frmr); |
e1183210 TT |
349 | if (test_bit(RDMACTXT_F_LAST_CTXT, &ctxt->flags)) { |
350 | struct svc_rdma_op_ctxt *read_hdr = ctxt->read_hdr; | |
3fe04ee9 CL |
351 | if (read_hdr) { |
352 | spin_lock_bh(&xprt->sc_rq_dto_lock); | |
353 | set_bit(XPT_DATA, &xprt->sc_xprt.xpt_flags); | |
354 | list_add_tail(&read_hdr->dto_q, | |
355 | &xprt->sc_read_complete_q); | |
356 | spin_unlock_bh(&xprt->sc_rq_dto_lock); | |
357 | } else { | |
358 | pr_err("svcrdma: ctxt->read_hdr == NULL\n"); | |
359 | } | |
e1183210 TT |
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; | |
0bf48289 SW |
381 | struct ib_wc wc_a[6]; |
382 | struct ib_wc *wc; | |
377f9b2f TT |
383 | struct ib_cq *cq = xprt->sc_sq_cq; |
384 | int ret; | |
385 | ||
0bf48289 SW |
386 | memset(wc_a, 0, sizeof(wc_a)); |
387 | ||
dbcd00eb TT |
388 | if (!test_and_clear_bit(RDMAXPRT_SQ_PENDING, &xprt->sc_flags)) |
389 | return; | |
390 | ||
391 | ib_req_notify_cq(xprt->sc_sq_cq, IB_CQ_NEXT_COMP); | |
377f9b2f | 392 | atomic_inc(&rdma_stat_sq_poll); |
0bf48289 SW |
393 | while ((ret = ib_poll_cq(cq, ARRAY_SIZE(wc_a), wc_a)) > 0) { |
394 | int i; | |
377f9b2f | 395 | |
0bf48289 SW |
396 | for (i = 0; i < ret; i++) { |
397 | wc = &wc_a[i]; | |
398 | if (wc->status != IB_WC_SUCCESS) { | |
76357c71 SG |
399 | dprintk("svcrdma: sq wc err status %s (%d)\n", |
400 | ib_wc_status_msg(wc->status), | |
0bf48289 | 401 | wc->status); |
377f9b2f | 402 | |
0bf48289 SW |
403 | /* Close the transport */ |
404 | set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags); | |
405 | } | |
377f9b2f | 406 | |
0bf48289 SW |
407 | /* Decrement used SQ WR count */ |
408 | atomic_dec(&xprt->sc_sq_count); | |
409 | wake_up(&xprt->sc_send_wait); | |
410 | ||
411 | ctxt = (struct svc_rdma_op_ctxt *) | |
412 | (unsigned long)wc->wr_id; | |
413 | if (ctxt) | |
414 | process_context(xprt, ctxt); | |
415 | ||
416 | svc_xprt_put(&xprt->sc_xprt); | |
417 | } | |
377f9b2f TT |
418 | } |
419 | ||
420 | if (ctxt) | |
421 | atomic_inc(&rdma_stat_sq_prod); | |
422 | } | |
423 | ||
424 | static void sq_comp_handler(struct ib_cq *cq, void *cq_context) | |
425 | { | |
426 | struct svcxprt_rdma *xprt = cq_context; | |
427 | unsigned long flags; | |
428 | ||
1711386c TT |
429 | /* Guard against unconditional flush call for destroyed QP */ |
430 | if (atomic_read(&xprt->sc_xprt.xpt_ref.refcount)==0) | |
431 | return; | |
432 | ||
377f9b2f TT |
433 | /* |
434 | * Set the bit regardless of whether or not it's on the list | |
435 | * because it may be on the list already due to an RQ | |
436 | * completion. | |
1711386c | 437 | */ |
377f9b2f TT |
438 | set_bit(RDMAXPRT_SQ_PENDING, &xprt->sc_flags); |
439 | ||
440 | /* | |
441 | * If this transport is not already on the DTO transport queue, | |
442 | * add it | |
443 | */ | |
444 | spin_lock_irqsave(&dto_lock, flags); | |
c48cbb40 TT |
445 | if (list_empty(&xprt->sc_dto_q)) { |
446 | svc_xprt_get(&xprt->sc_xprt); | |
377f9b2f | 447 | list_add_tail(&xprt->sc_dto_q, &dto_xprt_q); |
c48cbb40 | 448 | } |
377f9b2f TT |
449 | spin_unlock_irqrestore(&dto_lock, flags); |
450 | ||
451 | /* Tasklet does all the work to avoid irqsave locks. */ | |
452 | tasklet_schedule(&dto_tasklet); | |
453 | } | |
454 | ||
377f9b2f TT |
455 | static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *serv, |
456 | int listener) | |
457 | { | |
458 | struct svcxprt_rdma *cma_xprt = kzalloc(sizeof *cma_xprt, GFP_KERNEL); | |
459 | ||
460 | if (!cma_xprt) | |
461 | return NULL; | |
bd4620dd | 462 | svc_xprt_init(&init_net, &svc_rdma_class, &cma_xprt->sc_xprt, serv); |
377f9b2f TT |
463 | INIT_LIST_HEAD(&cma_xprt->sc_accept_q); |
464 | INIT_LIST_HEAD(&cma_xprt->sc_dto_q); | |
465 | INIT_LIST_HEAD(&cma_xprt->sc_rq_dto_q); | |
466 | INIT_LIST_HEAD(&cma_xprt->sc_read_complete_q); | |
64be8608 | 467 | INIT_LIST_HEAD(&cma_xprt->sc_frmr_q); |
377f9b2f TT |
468 | init_waitqueue_head(&cma_xprt->sc_send_wait); |
469 | ||
470 | spin_lock_init(&cma_xprt->sc_lock); | |
377f9b2f | 471 | spin_lock_init(&cma_xprt->sc_rq_dto_lock); |
64be8608 | 472 | spin_lock_init(&cma_xprt->sc_frmr_q_lock); |
377f9b2f TT |
473 | |
474 | cma_xprt->sc_ord = svcrdma_ord; | |
475 | ||
476 | cma_xprt->sc_max_req_size = svcrdma_max_req_size; | |
477 | cma_xprt->sc_max_requests = svcrdma_max_requests; | |
478 | cma_xprt->sc_sq_depth = svcrdma_max_requests * RPCRDMA_SQ_DEPTH_MULT; | |
479 | atomic_set(&cma_xprt->sc_sq_count, 0); | |
87295b6c | 480 | atomic_set(&cma_xprt->sc_ctxt_used, 0); |
377f9b2f | 481 | |
8948896c | 482 | if (listener) |
377f9b2f TT |
483 | set_bit(XPT_LISTENER, &cma_xprt->sc_xprt.xpt_flags); |
484 | ||
485 | return cma_xprt; | |
486 | } | |
487 | ||
377f9b2f TT |
488 | int svc_rdma_post_recv(struct svcxprt_rdma *xprt) |
489 | { | |
490 | struct ib_recv_wr recv_wr, *bad_recv_wr; | |
491 | struct svc_rdma_op_ctxt *ctxt; | |
492 | struct page *page; | |
a5abf4e8 | 493 | dma_addr_t pa; |
377f9b2f TT |
494 | int sge_no; |
495 | int buflen; | |
496 | int ret; | |
497 | ||
498 | ctxt = svc_rdma_get_context(xprt); | |
499 | buflen = 0; | |
500 | ctxt->direction = DMA_FROM_DEVICE; | |
501 | for (sge_no = 0; buflen < xprt->sc_max_req_size; sge_no++) { | |
3fe04ee9 CL |
502 | if (sge_no >= xprt->sc_max_sge) { |
503 | pr_err("svcrdma: Too many sges (%d)\n", sge_no); | |
504 | goto err_put_ctxt; | |
505 | } | |
b7e0b9a9 | 506 | page = alloc_page(GFP_KERNEL | __GFP_NOFAIL); |
377f9b2f | 507 | ctxt->pages[sge_no] = page; |
b432e6b3 TT |
508 | pa = ib_dma_map_page(xprt->sc_cm_id->device, |
509 | page, 0, PAGE_SIZE, | |
377f9b2f | 510 | DMA_FROM_DEVICE); |
a5abf4e8 TT |
511 | if (ib_dma_mapping_error(xprt->sc_cm_id->device, pa)) |
512 | goto err_put_ctxt; | |
513 | atomic_inc(&xprt->sc_dma_used); | |
377f9b2f TT |
514 | ctxt->sge[sge_no].addr = pa; |
515 | ctxt->sge[sge_no].length = PAGE_SIZE; | |
a5abf4e8 | 516 | ctxt->sge[sge_no].lkey = xprt->sc_dma_lkey; |
4a84386f | 517 | ctxt->count = sge_no + 1; |
377f9b2f TT |
518 | buflen += PAGE_SIZE; |
519 | } | |
377f9b2f TT |
520 | recv_wr.next = NULL; |
521 | recv_wr.sg_list = &ctxt->sge[0]; | |
522 | recv_wr.num_sge = ctxt->count; | |
523 | recv_wr.wr_id = (u64)(unsigned long)ctxt; | |
524 | ||
0905c0f0 | 525 | svc_xprt_get(&xprt->sc_xprt); |
377f9b2f | 526 | ret = ib_post_recv(xprt->sc_qp, &recv_wr, &bad_recv_wr); |
0905c0f0 | 527 | if (ret) { |
21515e46 | 528 | svc_rdma_unmap_dma(ctxt); |
05a0826a | 529 | svc_rdma_put_context(ctxt, 1); |
21515e46 | 530 | svc_xprt_put(&xprt->sc_xprt); |
0905c0f0 | 531 | } |
377f9b2f | 532 | return ret; |
a5abf4e8 TT |
533 | |
534 | err_put_ctxt: | |
4a84386f | 535 | svc_rdma_unmap_dma(ctxt); |
a5abf4e8 TT |
536 | svc_rdma_put_context(ctxt, 1); |
537 | return -ENOMEM; | |
377f9b2f TT |
538 | } |
539 | ||
540 | /* | |
541 | * This function handles the CONNECT_REQUEST event on a listening | |
542 | * endpoint. It is passed the cma_id for the _new_ connection. The context in | |
543 | * this cma_id is inherited from the listening cma_id and is the svc_xprt | |
544 | * structure for the listening endpoint. | |
545 | * | |
546 | * This function creates a new xprt for the new connection and enqueues it on | |
547 | * the accept queue for the listent xprt. When the listen thread is kicked, it | |
548 | * will call the recvfrom method on the listen xprt which will accept the new | |
549 | * connection. | |
550 | */ | |
36ef25e4 | 551 | static void handle_connect_req(struct rdma_cm_id *new_cma_id, size_t client_ird) |
377f9b2f TT |
552 | { |
553 | struct svcxprt_rdma *listen_xprt = new_cma_id->context; | |
554 | struct svcxprt_rdma *newxprt; | |
af261af4 | 555 | struct sockaddr *sa; |
377f9b2f TT |
556 | |
557 | /* Create a new transport */ | |
558 | newxprt = rdma_create_xprt(listen_xprt->sc_xprt.xpt_server, 0); | |
559 | if (!newxprt) { | |
560 | dprintk("svcrdma: failed to create new transport\n"); | |
561 | return; | |
562 | } | |
563 | newxprt->sc_cm_id = new_cma_id; | |
564 | new_cma_id->context = newxprt; | |
565 | dprintk("svcrdma: Creating newxprt=%p, cm_id=%p, listenxprt=%p\n", | |
566 | newxprt, newxprt->sc_cm_id, listen_xprt); | |
567 | ||
36ef25e4 TT |
568 | /* Save client advertised inbound read limit for use later in accept. */ |
569 | newxprt->sc_ord = client_ird; | |
570 | ||
af261af4 TT |
571 | /* Set the local and remote addresses in the transport */ |
572 | sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.dst_addr; | |
573 | svc_xprt_set_remote(&newxprt->sc_xprt, sa, svc_addr_len(sa)); | |
574 | sa = (struct sockaddr *)&newxprt->sc_cm_id->route.addr.src_addr; | |
575 | svc_xprt_set_local(&newxprt->sc_xprt, sa, svc_addr_len(sa)); | |
576 | ||
377f9b2f TT |
577 | /* |
578 | * Enqueue the new transport on the accept queue of the listening | |
579 | * transport | |
580 | */ | |
581 | spin_lock_bh(&listen_xprt->sc_lock); | |
582 | list_add_tail(&newxprt->sc_accept_q, &listen_xprt->sc_accept_q); | |
583 | spin_unlock_bh(&listen_xprt->sc_lock); | |
584 | ||
377f9b2f TT |
585 | set_bit(XPT_CONN, &listen_xprt->sc_xprt.xpt_flags); |
586 | svc_xprt_enqueue(&listen_xprt->sc_xprt); | |
587 | } | |
588 | ||
589 | /* | |
590 | * Handles events generated on the listening endpoint. These events will be | |
591 | * either be incoming connect requests or adapter removal events. | |
592 | */ | |
593 | static int rdma_listen_handler(struct rdma_cm_id *cma_id, | |
594 | struct rdma_cm_event *event) | |
595 | { | |
596 | struct svcxprt_rdma *xprt = cma_id->context; | |
597 | int ret = 0; | |
598 | ||
599 | switch (event->event) { | |
600 | case RDMA_CM_EVENT_CONNECT_REQUEST: | |
601 | dprintk("svcrdma: Connect request on cma_id=%p, xprt = %p, " | |
76357c71 SG |
602 | "event = %s (%d)\n", cma_id, cma_id->context, |
603 | rdma_event_msg(event->event), event->event); | |
36ef25e4 | 604 | handle_connect_req(cma_id, |
67080c82 | 605 | event->param.conn.initiator_depth); |
377f9b2f TT |
606 | break; |
607 | ||
608 | case RDMA_CM_EVENT_ESTABLISHED: | |
609 | /* Accept complete */ | |
610 | dprintk("svcrdma: Connection completed on LISTEN xprt=%p, " | |
611 | "cm_id=%p\n", xprt, cma_id); | |
612 | break; | |
613 | ||
614 | case RDMA_CM_EVENT_DEVICE_REMOVAL: | |
615 | dprintk("svcrdma: Device removal xprt=%p, cm_id=%p\n", | |
616 | xprt, cma_id); | |
617 | if (xprt) | |
618 | set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags); | |
619 | break; | |
620 | ||
621 | default: | |
622 | dprintk("svcrdma: Unexpected event on listening endpoint %p, " | |
76357c71 SG |
623 | "event = %s (%d)\n", cma_id, |
624 | rdma_event_msg(event->event), event->event); | |
377f9b2f TT |
625 | break; |
626 | } | |
627 | ||
628 | return ret; | |
629 | } | |
630 | ||
631 | static int rdma_cma_handler(struct rdma_cm_id *cma_id, | |
632 | struct rdma_cm_event *event) | |
633 | { | |
634 | struct svc_xprt *xprt = cma_id->context; | |
635 | struct svcxprt_rdma *rdma = | |
636 | container_of(xprt, struct svcxprt_rdma, sc_xprt); | |
637 | switch (event->event) { | |
638 | case RDMA_CM_EVENT_ESTABLISHED: | |
639 | /* Accept complete */ | |
c48cbb40 | 640 | svc_xprt_get(xprt); |
377f9b2f TT |
641 | dprintk("svcrdma: Connection completed on DTO xprt=%p, " |
642 | "cm_id=%p\n", xprt, cma_id); | |
643 | clear_bit(RDMAXPRT_CONN_PENDING, &rdma->sc_flags); | |
644 | svc_xprt_enqueue(xprt); | |
645 | break; | |
646 | case RDMA_CM_EVENT_DISCONNECTED: | |
647 | dprintk("svcrdma: Disconnect on DTO xprt=%p, cm_id=%p\n", | |
648 | xprt, cma_id); | |
649 | if (xprt) { | |
650 | set_bit(XPT_CLOSE, &xprt->xpt_flags); | |
651 | svc_xprt_enqueue(xprt); | |
120693d1 | 652 | svc_xprt_put(xprt); |
377f9b2f TT |
653 | } |
654 | break; | |
655 | case RDMA_CM_EVENT_DEVICE_REMOVAL: | |
656 | dprintk("svcrdma: Device removal cma_id=%p, xprt = %p, " | |
76357c71 SG |
657 | "event = %s (%d)\n", cma_id, xprt, |
658 | rdma_event_msg(event->event), event->event); | |
377f9b2f TT |
659 | if (xprt) { |
660 | set_bit(XPT_CLOSE, &xprt->xpt_flags); | |
661 | svc_xprt_enqueue(xprt); | |
ff79c74d | 662 | svc_xprt_put(xprt); |
377f9b2f TT |
663 | } |
664 | break; | |
665 | default: | |
666 | dprintk("svcrdma: Unexpected event on DTO endpoint %p, " | |
76357c71 SG |
667 | "event = %s (%d)\n", cma_id, |
668 | rdma_event_msg(event->event), event->event); | |
377f9b2f TT |
669 | break; |
670 | } | |
671 | return 0; | |
672 | } | |
673 | ||
674 | /* | |
675 | * Create a listening RDMA service endpoint. | |
676 | */ | |
677 | static struct svc_xprt *svc_rdma_create(struct svc_serv *serv, | |
62832c03 | 678 | struct net *net, |
377f9b2f TT |
679 | struct sockaddr *sa, int salen, |
680 | int flags) | |
681 | { | |
682 | struct rdma_cm_id *listen_id; | |
683 | struct svcxprt_rdma *cma_xprt; | |
377f9b2f TT |
684 | int ret; |
685 | ||
686 | dprintk("svcrdma: Creating RDMA socket\n"); | |
bade732a TT |
687 | if (sa->sa_family != AF_INET) { |
688 | dprintk("svcrdma: Address family %d is not supported.\n", sa->sa_family); | |
689 | return ERR_PTR(-EAFNOSUPPORT); | |
690 | } | |
377f9b2f TT |
691 | cma_xprt = rdma_create_xprt(serv, 1); |
692 | if (!cma_xprt) | |
58e8f621 | 693 | return ERR_PTR(-ENOMEM); |
377f9b2f | 694 | |
b26f9b99 SH |
695 | listen_id = rdma_create_id(rdma_listen_handler, cma_xprt, RDMA_PS_TCP, |
696 | IB_QPT_RC); | |
377f9b2f | 697 | if (IS_ERR(listen_id)) { |
58e8f621 TT |
698 | ret = PTR_ERR(listen_id); |
699 | dprintk("svcrdma: rdma_create_id failed = %d\n", ret); | |
700 | goto err0; | |
377f9b2f | 701 | } |
58e8f621 | 702 | |
377f9b2f TT |
703 | ret = rdma_bind_addr(listen_id, sa); |
704 | if (ret) { | |
377f9b2f | 705 | dprintk("svcrdma: rdma_bind_addr failed = %d\n", ret); |
58e8f621 | 706 | goto err1; |
377f9b2f TT |
707 | } |
708 | cma_xprt->sc_cm_id = listen_id; | |
709 | ||
710 | ret = rdma_listen(listen_id, RPCRDMA_LISTEN_BACKLOG); | |
711 | if (ret) { | |
377f9b2f | 712 | dprintk("svcrdma: rdma_listen failed = %d\n", ret); |
58e8f621 | 713 | goto err1; |
377f9b2f TT |
714 | } |
715 | ||
716 | /* | |
717 | * We need to use the address from the cm_id in case the | |
718 | * caller specified 0 for the port number. | |
719 | */ | |
720 | sa = (struct sockaddr *)&cma_xprt->sc_cm_id->route.addr.src_addr; | |
721 | svc_xprt_set_local(&cma_xprt->sc_xprt, sa, salen); | |
722 | ||
723 | return &cma_xprt->sc_xprt; | |
58e8f621 TT |
724 | |
725 | err1: | |
726 | rdma_destroy_id(listen_id); | |
727 | err0: | |
728 | kfree(cma_xprt); | |
729 | return ERR_PTR(ret); | |
377f9b2f TT |
730 | } |
731 | ||
64be8608 TT |
732 | static struct svc_rdma_fastreg_mr *rdma_alloc_frmr(struct svcxprt_rdma *xprt) |
733 | { | |
734 | struct ib_mr *mr; | |
735 | struct ib_fast_reg_page_list *pl; | |
736 | struct svc_rdma_fastreg_mr *frmr; | |
9ac07501 | 737 | u32 num_sg; |
64be8608 TT |
738 | |
739 | frmr = kmalloc(sizeof(*frmr), GFP_KERNEL); | |
740 | if (!frmr) | |
741 | goto err; | |
742 | ||
9ac07501 SW |
743 | num_sg = min_t(u32, RPCSVC_MAXPAGES, xprt->sc_frmr_pg_list_len); |
744 | mr = ib_alloc_mr(xprt->sc_pd, IB_MR_TYPE_MEM_REG, num_sg); | |
846d8e7c | 745 | if (IS_ERR(mr)) |
64be8608 TT |
746 | goto err_free_frmr; |
747 | ||
748 | pl = ib_alloc_fast_reg_page_list(xprt->sc_cm_id->device, | |
9ac07501 | 749 | num_sg); |
846d8e7c | 750 | if (IS_ERR(pl)) |
64be8608 TT |
751 | goto err_free_mr; |
752 | ||
753 | frmr->mr = mr; | |
754 | frmr->page_list = pl; | |
755 | INIT_LIST_HEAD(&frmr->frmr_list); | |
756 | return frmr; | |
757 | ||
758 | err_free_mr: | |
759 | ib_dereg_mr(mr); | |
760 | err_free_frmr: | |
761 | kfree(frmr); | |
762 | err: | |
763 | return ERR_PTR(-ENOMEM); | |
764 | } | |
765 | ||
766 | static void rdma_dealloc_frmr_q(struct svcxprt_rdma *xprt) | |
767 | { | |
768 | struct svc_rdma_fastreg_mr *frmr; | |
769 | ||
770 | while (!list_empty(&xprt->sc_frmr_q)) { | |
771 | frmr = list_entry(xprt->sc_frmr_q.next, | |
772 | struct svc_rdma_fastreg_mr, frmr_list); | |
773 | list_del_init(&frmr->frmr_list); | |
774 | ib_dereg_mr(frmr->mr); | |
775 | ib_free_fast_reg_page_list(frmr->page_list); | |
776 | kfree(frmr); | |
777 | } | |
778 | } | |
779 | ||
780 | struct svc_rdma_fastreg_mr *svc_rdma_get_frmr(struct svcxprt_rdma *rdma) | |
781 | { | |
782 | struct svc_rdma_fastreg_mr *frmr = NULL; | |
783 | ||
784 | spin_lock_bh(&rdma->sc_frmr_q_lock); | |
785 | if (!list_empty(&rdma->sc_frmr_q)) { | |
786 | frmr = list_entry(rdma->sc_frmr_q.next, | |
787 | struct svc_rdma_fastreg_mr, frmr_list); | |
788 | list_del_init(&frmr->frmr_list); | |
789 | frmr->map_len = 0; | |
790 | frmr->page_list_len = 0; | |
791 | } | |
792 | spin_unlock_bh(&rdma->sc_frmr_q_lock); | |
793 | if (frmr) | |
794 | return frmr; | |
795 | ||
796 | return rdma_alloc_frmr(rdma); | |
797 | } | |
798 | ||
799 | static void frmr_unmap_dma(struct svcxprt_rdma *xprt, | |
800 | struct svc_rdma_fastreg_mr *frmr) | |
801 | { | |
802 | int page_no; | |
803 | for (page_no = 0; page_no < frmr->page_list_len; page_no++) { | |
804 | dma_addr_t addr = frmr->page_list->page_list[page_no]; | |
805 | if (ib_dma_mapping_error(frmr->mr->device, addr)) | |
806 | continue; | |
807 | atomic_dec(&xprt->sc_dma_used); | |
b432e6b3 TT |
808 | ib_dma_unmap_page(frmr->mr->device, addr, PAGE_SIZE, |
809 | frmr->direction); | |
64be8608 TT |
810 | } |
811 | } | |
812 | ||
813 | void svc_rdma_put_frmr(struct svcxprt_rdma *rdma, | |
814 | struct svc_rdma_fastreg_mr *frmr) | |
815 | { | |
816 | if (frmr) { | |
817 | frmr_unmap_dma(rdma, frmr); | |
818 | spin_lock_bh(&rdma->sc_frmr_q_lock); | |
3fe04ee9 | 819 | WARN_ON_ONCE(!list_empty(&frmr->frmr_list)); |
64be8608 TT |
820 | list_add(&frmr->frmr_list, &rdma->sc_frmr_q); |
821 | spin_unlock_bh(&rdma->sc_frmr_q_lock); | |
822 | } | |
823 | } | |
824 | ||
377f9b2f TT |
825 | /* |
826 | * This is the xpo_recvfrom function for listening endpoints. Its | |
827 | * purpose is to accept incoming connections. The CMA callback handler | |
828 | * has already created a new transport and attached it to the new CMA | |
829 | * ID. | |
830 | * | |
831 | * There is a queue of pending connections hung on the listening | |
832 | * transport. This queue contains the new svc_xprt structure. This | |
833 | * function takes svc_xprt structures off the accept_q and completes | |
834 | * the connection. | |
835 | */ | |
836 | static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt) | |
837 | { | |
838 | struct svcxprt_rdma *listen_rdma; | |
839 | struct svcxprt_rdma *newxprt = NULL; | |
840 | struct rdma_conn_param conn_param; | |
8e37210b | 841 | struct ib_cq_init_attr cq_attr = {}; |
377f9b2f TT |
842 | struct ib_qp_init_attr qp_attr; |
843 | struct ib_device_attr devattr; | |
ed72b9c6 | 844 | int uninitialized_var(dma_mr_acc); |
3de2c31c | 845 | int need_dma_mr = 0; |
377f9b2f TT |
846 | int ret; |
847 | int i; | |
848 | ||
849 | listen_rdma = container_of(xprt, struct svcxprt_rdma, sc_xprt); | |
850 | clear_bit(XPT_CONN, &xprt->xpt_flags); | |
851 | /* Get the next entry off the accept list */ | |
852 | spin_lock_bh(&listen_rdma->sc_lock); | |
853 | if (!list_empty(&listen_rdma->sc_accept_q)) { | |
854 | newxprt = list_entry(listen_rdma->sc_accept_q.next, | |
855 | struct svcxprt_rdma, sc_accept_q); | |
856 | list_del_init(&newxprt->sc_accept_q); | |
857 | } | |
858 | if (!list_empty(&listen_rdma->sc_accept_q)) | |
859 | set_bit(XPT_CONN, &listen_rdma->sc_xprt.xpt_flags); | |
860 | spin_unlock_bh(&listen_rdma->sc_lock); | |
861 | if (!newxprt) | |
862 | return NULL; | |
863 | ||
864 | dprintk("svcrdma: newxprt from accept queue = %p, cm_id=%p\n", | |
865 | newxprt, newxprt->sc_cm_id); | |
866 | ||
867 | ret = ib_query_device(newxprt->sc_cm_id->device, &devattr); | |
868 | if (ret) { | |
869 | dprintk("svcrdma: could not query device attributes on " | |
870 | "device %p, rc=%d\n", newxprt->sc_cm_id->device, ret); | |
871 | goto errout; | |
872 | } | |
873 | ||
874 | /* Qualify the transport resource defaults with the | |
875 | * capabilities of this particular device */ | |
876 | newxprt->sc_max_sge = min((size_t)devattr.max_sge, | |
877 | (size_t)RPCSVC_MAXPAGES); | |
bc3fe2e3 SW |
878 | newxprt->sc_max_sge_rd = min_t(size_t, devattr.max_sge_rd, |
879 | RPCSVC_MAXPAGES); | |
377f9b2f TT |
880 | newxprt->sc_max_requests = min((size_t)devattr.max_qp_wr, |
881 | (size_t)svcrdma_max_requests); | |
882 | newxprt->sc_sq_depth = RPCRDMA_SQ_DEPTH_MULT * newxprt->sc_max_requests; | |
883 | ||
36ef25e4 TT |
884 | /* |
885 | * Limit ORD based on client limit, local device limit, and | |
886 | * configured svcrdma limit. | |
887 | */ | |
888 | newxprt->sc_ord = min_t(size_t, devattr.max_qp_rd_atom, newxprt->sc_ord); | |
889 | newxprt->sc_ord = min_t(size_t, svcrdma_ord, newxprt->sc_ord); | |
377f9b2f TT |
890 | |
891 | newxprt->sc_pd = ib_alloc_pd(newxprt->sc_cm_id->device); | |
892 | if (IS_ERR(newxprt->sc_pd)) { | |
893 | dprintk("svcrdma: error creating PD for connect request\n"); | |
894 | goto errout; | |
895 | } | |
8e37210b | 896 | cq_attr.cqe = newxprt->sc_sq_depth; |
377f9b2f TT |
897 | newxprt->sc_sq_cq = ib_create_cq(newxprt->sc_cm_id->device, |
898 | sq_comp_handler, | |
899 | cq_event_handler, | |
900 | newxprt, | |
8e37210b | 901 | &cq_attr); |
377f9b2f TT |
902 | if (IS_ERR(newxprt->sc_sq_cq)) { |
903 | dprintk("svcrdma: error creating SQ CQ for connect request\n"); | |
904 | goto errout; | |
905 | } | |
8e37210b | 906 | cq_attr.cqe = newxprt->sc_max_requests; |
377f9b2f TT |
907 | newxprt->sc_rq_cq = ib_create_cq(newxprt->sc_cm_id->device, |
908 | rq_comp_handler, | |
909 | cq_event_handler, | |
910 | newxprt, | |
8e37210b | 911 | &cq_attr); |
377f9b2f TT |
912 | if (IS_ERR(newxprt->sc_rq_cq)) { |
913 | dprintk("svcrdma: error creating RQ CQ for connect request\n"); | |
914 | goto errout; | |
915 | } | |
916 | ||
917 | memset(&qp_attr, 0, sizeof qp_attr); | |
918 | qp_attr.event_handler = qp_event_handler; | |
919 | qp_attr.qp_context = &newxprt->sc_xprt; | |
920 | qp_attr.cap.max_send_wr = newxprt->sc_sq_depth; | |
921 | qp_attr.cap.max_recv_wr = newxprt->sc_max_requests; | |
922 | qp_attr.cap.max_send_sge = newxprt->sc_max_sge; | |
923 | qp_attr.cap.max_recv_sge = newxprt->sc_max_sge; | |
924 | qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR; | |
925 | qp_attr.qp_type = IB_QPT_RC; | |
926 | qp_attr.send_cq = newxprt->sc_sq_cq; | |
927 | qp_attr.recv_cq = newxprt->sc_rq_cq; | |
928 | dprintk("svcrdma: newxprt->sc_cm_id=%p, newxprt->sc_pd=%p\n" | |
929 | " cm_id->device=%p, sc_pd->device=%p\n" | |
930 | " cap.max_send_wr = %d\n" | |
931 | " cap.max_recv_wr = %d\n" | |
932 | " cap.max_send_sge = %d\n" | |
933 | " cap.max_recv_sge = %d\n", | |
934 | newxprt->sc_cm_id, newxprt->sc_pd, | |
935 | newxprt->sc_cm_id->device, newxprt->sc_pd->device, | |
936 | qp_attr.cap.max_send_wr, | |
937 | qp_attr.cap.max_recv_wr, | |
938 | qp_attr.cap.max_send_sge, | |
939 | qp_attr.cap.max_recv_sge); | |
940 | ||
941 | ret = rdma_create_qp(newxprt->sc_cm_id, newxprt->sc_pd, &qp_attr); | |
942 | if (ret) { | |
d1e458fe SW |
943 | dprintk("svcrdma: failed to create QP, ret=%d\n", ret); |
944 | goto errout; | |
377f9b2f TT |
945 | } |
946 | newxprt->sc_qp = newxprt->sc_cm_id->qp; | |
947 | ||
3a5c6380 TT |
948 | /* |
949 | * Use the most secure set of MR resources based on the | |
950 | * transport type and available memory management features in | |
951 | * the device. Here's the table implemented below: | |
952 | * | |
953 | * Fast Global DMA Remote WR | |
954 | * Reg LKEY MR Access | |
955 | * Sup'd Sup'd Needed Needed | |
956 | * | |
957 | * IWARP N N Y Y | |
958 | * N Y Y Y | |
959 | * Y N Y N | |
960 | * Y Y N - | |
961 | * | |
962 | * IB N N Y N | |
963 | * N Y N - | |
964 | * Y N Y N | |
965 | * Y Y N - | |
966 | * | |
967 | * NB: iWARP requires remote write access for the data sink | |
968 | * of an RDMA_READ. IB does not. | |
969 | */ | |
e5452411 | 970 | newxprt->sc_reader = rdma_read_chunk_lcl; |
3a5c6380 TT |
971 | if (devattr.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) { |
972 | newxprt->sc_frmr_pg_list_len = | |
973 | devattr.max_fast_reg_page_list_len; | |
974 | newxprt->sc_dev_caps |= SVCRDMA_DEVCAP_FAST_REG; | |
e5452411 | 975 | newxprt->sc_reader = rdma_read_chunk_frmr; |
3a5c6380 TT |
976 | } |
977 | ||
978 | /* | |
979 | * Determine if a DMA MR is required and if so, what privs are required | |
980 | */ | |
3de2c31c MW |
981 | if (!rdma_protocol_iwarp(newxprt->sc_cm_id->device, |
982 | newxprt->sc_cm_id->port_num) && | |
5d9fb044 | 983 | !rdma_ib_or_roce(newxprt->sc_cm_id->device, |
3de2c31c | 984 | newxprt->sc_cm_id->port_num)) |
377f9b2f | 985 | goto errout; |
3de2c31c MW |
986 | |
987 | if (!(newxprt->sc_dev_caps & SVCRDMA_DEVCAP_FAST_REG) || | |
988 | !(devattr.device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY)) { | |
989 | need_dma_mr = 1; | |
990 | dma_mr_acc = IB_ACCESS_LOCAL_WRITE; | |
991 | if (rdma_protocol_iwarp(newxprt->sc_cm_id->device, | |
992 | newxprt->sc_cm_id->port_num) && | |
993 | !(newxprt->sc_dev_caps & SVCRDMA_DEVCAP_FAST_REG)) | |
994 | dma_mr_acc |= IB_ACCESS_REMOTE_WRITE; | |
377f9b2f TT |
995 | } |
996 | ||
3de2c31c MW |
997 | if (rdma_protocol_iwarp(newxprt->sc_cm_id->device, |
998 | newxprt->sc_cm_id->port_num)) | |
999 | newxprt->sc_dev_caps |= SVCRDMA_DEVCAP_READ_W_INV; | |
1000 | ||
3a5c6380 TT |
1001 | /* Create the DMA MR if needed, otherwise, use the DMA LKEY */ |
1002 | if (need_dma_mr) { | |
1003 | /* Register all of physical memory */ | |
1004 | newxprt->sc_phys_mr = | |
1005 | ib_get_dma_mr(newxprt->sc_pd, dma_mr_acc); | |
1006 | if (IS_ERR(newxprt->sc_phys_mr)) { | |
1007 | dprintk("svcrdma: Failed to create DMA MR ret=%d\n", | |
1008 | ret); | |
1009 | goto errout; | |
1010 | } | |
1011 | newxprt->sc_dma_lkey = newxprt->sc_phys_mr->lkey; | |
1012 | } else | |
1013 | newxprt->sc_dma_lkey = | |
1014 | newxprt->sc_cm_id->device->local_dma_lkey; | |
1015 | ||
377f9b2f TT |
1016 | /* Post receive buffers */ |
1017 | for (i = 0; i < newxprt->sc_max_requests; i++) { | |
1018 | ret = svc_rdma_post_recv(newxprt); | |
1019 | if (ret) { | |
1020 | dprintk("svcrdma: failure posting receive buffers\n"); | |
1021 | goto errout; | |
1022 | } | |
1023 | } | |
1024 | ||
1025 | /* Swap out the handler */ | |
1026 | newxprt->sc_cm_id->event_handler = rdma_cma_handler; | |
1027 | ||
af261af4 TT |
1028 | /* |
1029 | * Arm the CQs for the SQ and RQ before accepting so we can't | |
1030 | * miss the first message | |
1031 | */ | |
1032 | ib_req_notify_cq(newxprt->sc_sq_cq, IB_CQ_NEXT_COMP); | |
1033 | ib_req_notify_cq(newxprt->sc_rq_cq, IB_CQ_NEXT_COMP); | |
1034 | ||
377f9b2f TT |
1035 | /* Accept Connection */ |
1036 | set_bit(RDMAXPRT_CONN_PENDING, &newxprt->sc_flags); | |
1037 | memset(&conn_param, 0, sizeof conn_param); | |
1038 | conn_param.responder_resources = 0; | |
1039 | conn_param.initiator_depth = newxprt->sc_ord; | |
1040 | ret = rdma_accept(newxprt->sc_cm_id, &conn_param); | |
1041 | if (ret) { | |
1042 | dprintk("svcrdma: failed to accept new connection, ret=%d\n", | |
1043 | ret); | |
1044 | goto errout; | |
1045 | } | |
1046 | ||
1047 | dprintk("svcrdma: new connection %p accepted with the following " | |
1048 | "attributes:\n" | |
21454aaa | 1049 | " local_ip : %pI4\n" |
377f9b2f | 1050 | " local_port : %d\n" |
21454aaa | 1051 | " remote_ip : %pI4\n" |
377f9b2f TT |
1052 | " remote_port : %d\n" |
1053 | " max_sge : %d\n" | |
bc3fe2e3 | 1054 | " max_sge_rd : %d\n" |
377f9b2f TT |
1055 | " sq_depth : %d\n" |
1056 | " max_requests : %d\n" | |
1057 | " ord : %d\n", | |
1058 | newxprt, | |
21454aaa HH |
1059 | &((struct sockaddr_in *)&newxprt->sc_cm_id-> |
1060 | route.addr.src_addr)->sin_addr.s_addr, | |
377f9b2f TT |
1061 | ntohs(((struct sockaddr_in *)&newxprt->sc_cm_id-> |
1062 | route.addr.src_addr)->sin_port), | |
21454aaa HH |
1063 | &((struct sockaddr_in *)&newxprt->sc_cm_id-> |
1064 | route.addr.dst_addr)->sin_addr.s_addr, | |
377f9b2f TT |
1065 | ntohs(((struct sockaddr_in *)&newxprt->sc_cm_id-> |
1066 | route.addr.dst_addr)->sin_port), | |
1067 | newxprt->sc_max_sge, | |
bc3fe2e3 | 1068 | newxprt->sc_max_sge_rd, |
377f9b2f TT |
1069 | newxprt->sc_sq_depth, |
1070 | newxprt->sc_max_requests, | |
1071 | newxprt->sc_ord); | |
1072 | ||
377f9b2f TT |
1073 | return &newxprt->sc_xprt; |
1074 | ||
1075 | errout: | |
1076 | dprintk("svcrdma: failure accepting new connection rc=%d.\n", ret); | |
c48cbb40 TT |
1077 | /* Take a reference in case the DTO handler runs */ |
1078 | svc_xprt_get(&newxprt->sc_xprt); | |
1711386c | 1079 | if (newxprt->sc_qp && !IS_ERR(newxprt->sc_qp)) |
c48cbb40 | 1080 | ib_destroy_qp(newxprt->sc_qp); |
377f9b2f | 1081 | rdma_destroy_id(newxprt->sc_cm_id); |
c48cbb40 TT |
1082 | /* This call to put will destroy the transport */ |
1083 | svc_xprt_put(&newxprt->sc_xprt); | |
377f9b2f TT |
1084 | return NULL; |
1085 | } | |
1086 | ||
377f9b2f TT |
1087 | static void svc_rdma_release_rqst(struct svc_rqst *rqstp) |
1088 | { | |
377f9b2f TT |
1089 | } |
1090 | ||
c48cbb40 | 1091 | /* |
1711386c | 1092 | * When connected, an svc_xprt has at least two references: |
c48cbb40 TT |
1093 | * |
1094 | * - A reference held by the cm_id between the ESTABLISHED and | |
1095 | * DISCONNECTED events. If the remote peer disconnected first, this | |
1096 | * reference could be gone. | |
1097 | * | |
1098 | * - A reference held by the svc_recv code that called this function | |
1099 | * as part of close processing. | |
1100 | * | |
1711386c | 1101 | * At a minimum one references should still be held. |
c48cbb40 | 1102 | */ |
377f9b2f TT |
1103 | static void svc_rdma_detach(struct svc_xprt *xprt) |
1104 | { | |
1105 | struct svcxprt_rdma *rdma = | |
1106 | container_of(xprt, struct svcxprt_rdma, sc_xprt); | |
377f9b2f | 1107 | dprintk("svc: svc_rdma_detach(%p)\n", xprt); |
c48cbb40 TT |
1108 | |
1109 | /* Disconnect and flush posted WQE */ | |
377f9b2f | 1110 | rdma_disconnect(rdma->sc_cm_id); |
377f9b2f TT |
1111 | } |
1112 | ||
8da91ea8 | 1113 | static void __svc_rdma_free(struct work_struct *work) |
377f9b2f | 1114 | { |
8da91ea8 TT |
1115 | struct svcxprt_rdma *rdma = |
1116 | container_of(work, struct svcxprt_rdma, sc_work); | |
377f9b2f | 1117 | dprintk("svcrdma: svc_rdma_free(%p)\n", rdma); |
8da91ea8 | 1118 | |
c48cbb40 | 1119 | /* We should only be called from kref_put */ |
3fe04ee9 CL |
1120 | if (atomic_read(&rdma->sc_xprt.xpt_ref.refcount) != 0) |
1121 | pr_err("svcrdma: sc_xprt still in use? (%d)\n", | |
1122 | atomic_read(&rdma->sc_xprt.xpt_ref.refcount)); | |
8da91ea8 | 1123 | |
356d0a15 TT |
1124 | /* |
1125 | * Destroy queued, but not processed read completions. Note | |
1126 | * that this cleanup has to be done before destroying the | |
1127 | * cm_id because the device ptr is needed to unmap the dma in | |
1128 | * svc_rdma_put_context. | |
1129 | */ | |
356d0a15 TT |
1130 | while (!list_empty(&rdma->sc_read_complete_q)) { |
1131 | struct svc_rdma_op_ctxt *ctxt; | |
1132 | ctxt = list_entry(rdma->sc_read_complete_q.next, | |
1133 | struct svc_rdma_op_ctxt, | |
1134 | dto_q); | |
1135 | list_del_init(&ctxt->dto_q); | |
1136 | svc_rdma_put_context(ctxt, 1); | |
1137 | } | |
356d0a15 TT |
1138 | |
1139 | /* Destroy queued, but not processed recv completions */ | |
356d0a15 TT |
1140 | while (!list_empty(&rdma->sc_rq_dto_q)) { |
1141 | struct svc_rdma_op_ctxt *ctxt; | |
1142 | ctxt = list_entry(rdma->sc_rq_dto_q.next, | |
1143 | struct svc_rdma_op_ctxt, | |
1144 | dto_q); | |
1145 | list_del_init(&ctxt->dto_q); | |
1146 | svc_rdma_put_context(ctxt, 1); | |
1147 | } | |
356d0a15 TT |
1148 | |
1149 | /* Warn if we leaked a resource or under-referenced */ | |
3fe04ee9 CL |
1150 | if (atomic_read(&rdma->sc_ctxt_used) != 0) |
1151 | pr_err("svcrdma: ctxt still in use? (%d)\n", | |
1152 | atomic_read(&rdma->sc_ctxt_used)); | |
1153 | if (atomic_read(&rdma->sc_dma_used) != 0) | |
1154 | pr_err("svcrdma: dma still in use? (%d)\n", | |
1155 | atomic_read(&rdma->sc_dma_used)); | |
356d0a15 | 1156 | |
64be8608 TT |
1157 | /* De-allocate fastreg mr */ |
1158 | rdma_dealloc_frmr_q(rdma); | |
1159 | ||
1711386c TT |
1160 | /* Destroy the QP if present (not a listener) */ |
1161 | if (rdma->sc_qp && !IS_ERR(rdma->sc_qp)) | |
1162 | ib_destroy_qp(rdma->sc_qp); | |
1163 | ||
c48cbb40 TT |
1164 | if (rdma->sc_sq_cq && !IS_ERR(rdma->sc_sq_cq)) |
1165 | ib_destroy_cq(rdma->sc_sq_cq); | |
377f9b2f | 1166 | |
c48cbb40 TT |
1167 | if (rdma->sc_rq_cq && !IS_ERR(rdma->sc_rq_cq)) |
1168 | ib_destroy_cq(rdma->sc_rq_cq); | |
377f9b2f | 1169 | |
c48cbb40 TT |
1170 | if (rdma->sc_phys_mr && !IS_ERR(rdma->sc_phys_mr)) |
1171 | ib_dereg_mr(rdma->sc_phys_mr); | |
377f9b2f | 1172 | |
c48cbb40 TT |
1173 | if (rdma->sc_pd && !IS_ERR(rdma->sc_pd)) |
1174 | ib_dealloc_pd(rdma->sc_pd); | |
377f9b2f | 1175 | |
356d0a15 TT |
1176 | /* Destroy the CM ID */ |
1177 | rdma_destroy_id(rdma->sc_cm_id); | |
1178 | ||
c48cbb40 | 1179 | kfree(rdma); |
377f9b2f TT |
1180 | } |
1181 | ||
8da91ea8 TT |
1182 | static void svc_rdma_free(struct svc_xprt *xprt) |
1183 | { | |
1184 | struct svcxprt_rdma *rdma = | |
1185 | container_of(xprt, struct svcxprt_rdma, sc_xprt); | |
1186 | INIT_WORK(&rdma->sc_work, __svc_rdma_free); | |
a25e758c | 1187 | queue_work(svc_rdma_wq, &rdma->sc_work); |
8da91ea8 TT |
1188 | } |
1189 | ||
377f9b2f TT |
1190 | static int svc_rdma_has_wspace(struct svc_xprt *xprt) |
1191 | { | |
1192 | struct svcxprt_rdma *rdma = | |
1193 | container_of(xprt, struct svcxprt_rdma, sc_xprt); | |
1194 | ||
1195 | /* | |
0bf48289 | 1196 | * If there are already waiters on the SQ, |
377f9b2f TT |
1197 | * return false. |
1198 | */ | |
1199 | if (waitqueue_active(&rdma->sc_send_wait)) | |
1200 | return 0; | |
1201 | ||
1202 | /* Otherwise return true. */ | |
1203 | return 1; | |
1204 | } | |
1205 | ||
16e4d93f CL |
1206 | static int svc_rdma_secure_port(struct svc_rqst *rqstp) |
1207 | { | |
1208 | return 1; | |
1209 | } | |
1210 | ||
377f9b2f TT |
1211 | int svc_rdma_send(struct svcxprt_rdma *xprt, struct ib_send_wr *wr) |
1212 | { | |
5b180a9a TT |
1213 | struct ib_send_wr *bad_wr, *n_wr; |
1214 | int wr_count; | |
1215 | int i; | |
377f9b2f TT |
1216 | int ret; |
1217 | ||
1218 | if (test_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags)) | |
9d6347ac | 1219 | return -ENOTCONN; |
377f9b2f | 1220 | |
5b180a9a TT |
1221 | wr_count = 1; |
1222 | for (n_wr = wr->next; n_wr; n_wr = n_wr->next) | |
1223 | wr_count++; | |
1224 | ||
377f9b2f TT |
1225 | /* If the SQ is full, wait until an SQ entry is available */ |
1226 | while (1) { | |
1227 | spin_lock_bh(&xprt->sc_lock); | |
5b180a9a | 1228 | if (xprt->sc_sq_depth < atomic_read(&xprt->sc_sq_count) + wr_count) { |
377f9b2f TT |
1229 | spin_unlock_bh(&xprt->sc_lock); |
1230 | atomic_inc(&rdma_stat_sq_starve); | |
dbcd00eb TT |
1231 | |
1232 | /* See if we can opportunistically reap SQ WR to make room */ | |
377f9b2f TT |
1233 | sq_cq_reap(xprt); |
1234 | ||
1235 | /* Wait until SQ WR available if SQ still full */ | |
1236 | wait_event(xprt->sc_send_wait, | |
1237 | atomic_read(&xprt->sc_sq_count) < | |
1238 | xprt->sc_sq_depth); | |
830bb59b | 1239 | if (test_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags)) |
b432e6b3 | 1240 | return -ENOTCONN; |
377f9b2f TT |
1241 | continue; |
1242 | } | |
5b180a9a TT |
1243 | /* Take a transport ref for each WR posted */ |
1244 | for (i = 0; i < wr_count; i++) | |
1245 | svc_xprt_get(&xprt->sc_xprt); | |
1246 | ||
1247 | /* Bump used SQ WR count and post */ | |
1248 | atomic_add(wr_count, &xprt->sc_sq_count); | |
377f9b2f | 1249 | ret = ib_post_send(xprt->sc_qp, wr, &bad_wr); |
5b180a9a TT |
1250 | if (ret) { |
1251 | set_bit(XPT_CLOSE, &xprt->sc_xprt.xpt_flags); | |
1252 | atomic_sub(wr_count, &xprt->sc_sq_count); | |
1253 | for (i = 0; i < wr_count; i ++) | |
1254 | svc_xprt_put(&xprt->sc_xprt); | |
377f9b2f TT |
1255 | dprintk("svcrdma: failed to post SQ WR rc=%d, " |
1256 | "sc_sq_count=%d, sc_sq_depth=%d\n", | |
1257 | ret, atomic_read(&xprt->sc_sq_count), | |
1258 | xprt->sc_sq_depth); | |
0905c0f0 | 1259 | } |
377f9b2f | 1260 | spin_unlock_bh(&xprt->sc_lock); |
5b180a9a TT |
1261 | if (ret) |
1262 | wake_up(&xprt->sc_send_wait); | |
377f9b2f TT |
1263 | break; |
1264 | } | |
1265 | return ret; | |
1266 | } | |
1267 | ||
008fdbc5 TT |
1268 | void svc_rdma_send_error(struct svcxprt_rdma *xprt, struct rpcrdma_msg *rmsgp, |
1269 | enum rpcrdma_errcode err) | |
377f9b2f TT |
1270 | { |
1271 | struct ib_send_wr err_wr; | |
377f9b2f TT |
1272 | struct page *p; |
1273 | struct svc_rdma_op_ctxt *ctxt; | |
30b7e246 | 1274 | __be32 *va; |
377f9b2f TT |
1275 | int length; |
1276 | int ret; | |
1277 | ||
b7e0b9a9 | 1278 | p = alloc_page(GFP_KERNEL | __GFP_NOFAIL); |
377f9b2f TT |
1279 | va = page_address(p); |
1280 | ||
1281 | /* XDR encode error */ | |
1282 | length = svc_rdma_xdr_encode_error(xprt, rmsgp, err, va); | |
1283 | ||
4a84386f TT |
1284 | ctxt = svc_rdma_get_context(xprt); |
1285 | ctxt->direction = DMA_FROM_DEVICE; | |
1286 | ctxt->count = 1; | |
1287 | ctxt->pages[0] = p; | |
1288 | ||
377f9b2f | 1289 | /* Prepare SGE for local address */ |
4a84386f TT |
1290 | ctxt->sge[0].addr = ib_dma_map_page(xprt->sc_cm_id->device, |
1291 | p, 0, length, DMA_FROM_DEVICE); | |
1292 | if (ib_dma_mapping_error(xprt->sc_cm_id->device, ctxt->sge[0].addr)) { | |
04911b53 | 1293 | put_page(p); |
a5e50268 | 1294 | svc_rdma_put_context(ctxt, 1); |
04911b53 TT |
1295 | return; |
1296 | } | |
1297 | atomic_inc(&xprt->sc_dma_used); | |
4a84386f TT |
1298 | ctxt->sge[0].lkey = xprt->sc_dma_lkey; |
1299 | ctxt->sge[0].length = length; | |
377f9b2f TT |
1300 | |
1301 | /* Prepare SEND WR */ | |
1302 | memset(&err_wr, 0, sizeof err_wr); | |
1303 | ctxt->wr_op = IB_WR_SEND; | |
1304 | err_wr.wr_id = (unsigned long)ctxt; | |
4a84386f | 1305 | err_wr.sg_list = ctxt->sge; |
377f9b2f TT |
1306 | err_wr.num_sge = 1; |
1307 | err_wr.opcode = IB_WR_SEND; | |
1308 | err_wr.send_flags = IB_SEND_SIGNALED; | |
1309 | ||
1310 | /* Post It */ | |
1311 | ret = svc_rdma_send(xprt, &err_wr); | |
1312 | if (ret) { | |
008fdbc5 TT |
1313 | dprintk("svcrdma: Error %d posting send for protocol error\n", |
1314 | ret); | |
4a84386f | 1315 | svc_rdma_unmap_dma(ctxt); |
377f9b2f TT |
1316 | svc_rdma_put_context(ctxt, 1); |
1317 | } | |
377f9b2f | 1318 | } |