Commit | Line | Data |
---|---|---|
f58851e6 | 1 | /* |
c56c65fb TT |
2 | * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved. |
3 | * | |
4 | * This software is available to you under a choice of one of two | |
5 | * licenses. You may choose to be licensed under the terms of the GNU | |
6 | * General Public License (GPL) Version 2, available from the file | |
7 | * COPYING in the main directory of this source tree, or the BSD-type | |
8 | * license below: | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or without | |
11 | * modification, are permitted provided that the following conditions | |
12 | * are met: | |
13 | * | |
14 | * Redistributions of source code must retain the above copyright | |
15 | * notice, this list of conditions and the following disclaimer. | |
16 | * | |
17 | * Redistributions in binary form must reproduce the above | |
18 | * copyright notice, this list of conditions and the following | |
19 | * disclaimer in the documentation and/or other materials provided | |
20 | * with the distribution. | |
21 | * | |
22 | * Neither the name of the Network Appliance, Inc. nor the names of | |
23 | * its contributors may be used to endorse or promote products | |
24 | * derived from this software without specific prior written | |
25 | * permission. | |
26 | * | |
27 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
28 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
29 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
30 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
31 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
32 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
33 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
34 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
35 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
36 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
37 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
f58851e6 TT |
38 | */ |
39 | ||
c56c65fb TT |
40 | /* |
41 | * verbs.c | |
42 | * | |
43 | * Encapsulates the major functions managing: | |
44 | * o adapters | |
45 | * o endpoints | |
46 | * o connections | |
47 | * o buffer memory | |
48 | */ | |
49 | ||
a6b7a407 | 50 | #include <linux/interrupt.h> |
5a0e3ad6 | 51 | #include <linux/slab.h> |
eba8ff66 | 52 | #include <linux/prefetch.h> |
0dd39cae | 53 | #include <linux/sunrpc/addr.h> |
65866f82 | 54 | #include <asm/bitops.h> |
d0f36c46 | 55 | #include <linux/module.h> /* try_module_get()/module_put() */ |
c56c65fb | 56 | |
f58851e6 TT |
57 | #include "xprt_rdma.h" |
58 | ||
c56c65fb TT |
59 | /* |
60 | * Globals/Macros | |
61 | */ | |
62 | ||
f895b252 | 63 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
c56c65fb TT |
64 | # define RPCDBG_FACILITY RPCDBG_TRANS |
65 | #endif | |
66 | ||
67 | /* | |
68 | * internal functions | |
69 | */ | |
70 | ||
71 | /* | |
72 | * handle replies in tasklet context, using a single, global list | |
73 | * rdma tasklet function -- just turn around and call the func | |
74 | * for all replies on the list | |
75 | */ | |
76 | ||
77 | static DEFINE_SPINLOCK(rpcrdma_tk_lock_g); | |
78 | static LIST_HEAD(rpcrdma_tasklets_g); | |
79 | ||
80 | static void | |
81 | rpcrdma_run_tasklet(unsigned long data) | |
82 | { | |
83 | struct rpcrdma_rep *rep; | |
c56c65fb TT |
84 | unsigned long flags; |
85 | ||
86 | data = data; | |
87 | spin_lock_irqsave(&rpcrdma_tk_lock_g, flags); | |
88 | while (!list_empty(&rpcrdma_tasklets_g)) { | |
89 | rep = list_entry(rpcrdma_tasklets_g.next, | |
90 | struct rpcrdma_rep, rr_list); | |
91 | list_del(&rep->rr_list); | |
c56c65fb TT |
92 | spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags); |
93 | ||
494ae30d | 94 | rpcrdma_reply_handler(rep); |
c56c65fb TT |
95 | |
96 | spin_lock_irqsave(&rpcrdma_tk_lock_g, flags); | |
97 | } | |
98 | spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags); | |
99 | } | |
100 | ||
101 | static DECLARE_TASKLET(rpcrdma_tasklet_g, rpcrdma_run_tasklet, 0UL); | |
102 | ||
f1a03b76 CL |
103 | static void |
104 | rpcrdma_schedule_tasklet(struct list_head *sched_list) | |
105 | { | |
106 | unsigned long flags; | |
107 | ||
108 | spin_lock_irqsave(&rpcrdma_tk_lock_g, flags); | |
109 | list_splice_tail(sched_list, &rpcrdma_tasklets_g); | |
110 | spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags); | |
111 | tasklet_schedule(&rpcrdma_tasklet_g); | |
112 | } | |
113 | ||
c56c65fb TT |
114 | static void |
115 | rpcrdma_qp_async_error_upcall(struct ib_event *event, void *context) | |
116 | { | |
117 | struct rpcrdma_ep *ep = context; | |
118 | ||
7ff11de1 | 119 | pr_err("RPC: %s: %s on device %s ep %p\n", |
76357c71 | 120 | __func__, ib_event_msg(event->event), |
7ff11de1 | 121 | event->device->name, context); |
c56c65fb TT |
122 | if (ep->rep_connected == 1) { |
123 | ep->rep_connected = -EIO; | |
afadc468 | 124 | rpcrdma_conn_func(ep); |
c56c65fb TT |
125 | wake_up_all(&ep->rep_connect_wait); |
126 | } | |
127 | } | |
128 | ||
129 | static void | |
130 | rpcrdma_cq_async_error_upcall(struct ib_event *event, void *context) | |
131 | { | |
132 | struct rpcrdma_ep *ep = context; | |
133 | ||
7ff11de1 | 134 | pr_err("RPC: %s: %s on device %s ep %p\n", |
76357c71 | 135 | __func__, ib_event_msg(event->event), |
7ff11de1 | 136 | event->device->name, context); |
c56c65fb TT |
137 | if (ep->rep_connected == 1) { |
138 | ep->rep_connected = -EIO; | |
afadc468 | 139 | rpcrdma_conn_func(ep); |
c56c65fb TT |
140 | wake_up_all(&ep->rep_connect_wait); |
141 | } | |
142 | } | |
143 | ||
fc664485 CL |
144 | static void |
145 | rpcrdma_sendcq_process_wc(struct ib_wc *wc) | |
c56c65fb | 146 | { |
8502427c | 147 | /* WARNING: Only wr_id and status are reliable at this point */ |
e46ac34c CL |
148 | if (wc->wr_id == RPCRDMA_IGNORE_COMPLETION) { |
149 | if (wc->status != IB_WC_SUCCESS && | |
150 | wc->status != IB_WC_WR_FLUSH_ERR) | |
8502427c | 151 | pr_err("RPC: %s: SEND: %s\n", |
76357c71 | 152 | __func__, ib_wc_status_msg(wc->status)); |
8502427c CL |
153 | } else { |
154 | struct rpcrdma_mw *r; | |
155 | ||
156 | r = (struct rpcrdma_mw *)(unsigned long)wc->wr_id; | |
e46ac34c | 157 | r->mw_sendcompletion(wc); |
8502427c | 158 | } |
c56c65fb TT |
159 | } |
160 | ||
fc664485 | 161 | static int |
1c00dd07 | 162 | rpcrdma_sendcq_poll(struct ib_cq *cq, struct rpcrdma_ep *ep) |
c56c65fb | 163 | { |
1c00dd07 | 164 | struct ib_wc *wcs; |
8301a2c0 | 165 | int budget, count, rc; |
c56c65fb | 166 | |
8301a2c0 | 167 | budget = RPCRDMA_WC_BUDGET / RPCRDMA_POLLSIZE; |
1c00dd07 CL |
168 | do { |
169 | wcs = ep->rep_send_wcs; | |
170 | ||
171 | rc = ib_poll_cq(cq, RPCRDMA_POLLSIZE, wcs); | |
172 | if (rc <= 0) | |
173 | return rc; | |
174 | ||
175 | count = rc; | |
176 | while (count-- > 0) | |
177 | rpcrdma_sendcq_process_wc(wcs++); | |
8301a2c0 | 178 | } while (rc == RPCRDMA_POLLSIZE && --budget); |
1c00dd07 | 179 | return 0; |
fc664485 | 180 | } |
c56c65fb | 181 | |
fc664485 CL |
182 | /* |
183 | * Handle send, fast_reg_mr, and local_inv completions. | |
184 | * | |
185 | * Send events are typically suppressed and thus do not result | |
186 | * in an upcall. Occasionally one is signaled, however. This | |
187 | * prevents the provider's completion queue from wrapping and | |
188 | * losing a completion. | |
189 | */ | |
190 | static void | |
191 | rpcrdma_sendcq_upcall(struct ib_cq *cq, void *cq_context) | |
192 | { | |
1c00dd07 | 193 | struct rpcrdma_ep *ep = (struct rpcrdma_ep *)cq_context; |
fc664485 CL |
194 | int rc; |
195 | ||
1c00dd07 | 196 | rc = rpcrdma_sendcq_poll(cq, ep); |
fc664485 CL |
197 | if (rc) { |
198 | dprintk("RPC: %s: ib_poll_cq failed: %i\n", | |
199 | __func__, rc); | |
200 | return; | |
c56c65fb TT |
201 | } |
202 | ||
7f23f6f6 CL |
203 | rc = ib_req_notify_cq(cq, |
204 | IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS); | |
205 | if (rc == 0) | |
206 | return; | |
207 | if (rc < 0) { | |
fc664485 CL |
208 | dprintk("RPC: %s: ib_req_notify_cq failed: %i\n", |
209 | __func__, rc); | |
210 | return; | |
211 | } | |
212 | ||
1c00dd07 | 213 | rpcrdma_sendcq_poll(cq, ep); |
fc664485 CL |
214 | } |
215 | ||
216 | static void | |
bb96193d | 217 | rpcrdma_recvcq_process_wc(struct ib_wc *wc, struct list_head *sched_list) |
fc664485 CL |
218 | { |
219 | struct rpcrdma_rep *rep = | |
220 | (struct rpcrdma_rep *)(unsigned long)wc->wr_id; | |
221 | ||
8502427c CL |
222 | /* WARNING: Only wr_id and status are reliable at this point */ |
223 | if (wc->status != IB_WC_SUCCESS) | |
224 | goto out_fail; | |
fc664485 | 225 | |
8502427c | 226 | /* status == SUCCESS means all fields in wc are trustworthy */ |
fc664485 CL |
227 | if (wc->opcode != IB_WC_RECV) |
228 | return; | |
229 | ||
8502427c CL |
230 | dprintk("RPC: %s: rep %p opcode 'recv', length %u: success\n", |
231 | __func__, rep, wc->byte_len); | |
232 | ||
fc664485 | 233 | rep->rr_len = wc->byte_len; |
89e0d112 | 234 | ib_dma_sync_single_for_cpu(rep->rr_device, |
6b1184cd CL |
235 | rdmab_addr(rep->rr_rdmabuf), |
236 | rep->rr_len, DMA_FROM_DEVICE); | |
237 | prefetch(rdmab_to_msg(rep->rr_rdmabuf)); | |
fc664485 CL |
238 | |
239 | out_schedule: | |
bb96193d | 240 | list_add_tail(&rep->rr_list, sched_list); |
8502427c CL |
241 | return; |
242 | out_fail: | |
243 | if (wc->status != IB_WC_WR_FLUSH_ERR) | |
244 | pr_err("RPC: %s: rep %p: %s\n", | |
76357c71 | 245 | __func__, rep, ib_wc_status_msg(wc->status)); |
8502427c CL |
246 | rep->rr_len = ~0U; |
247 | goto out_schedule; | |
fc664485 CL |
248 | } |
249 | ||
250 | static int | |
1c00dd07 | 251 | rpcrdma_recvcq_poll(struct ib_cq *cq, struct rpcrdma_ep *ep) |
fc664485 | 252 | { |
bb96193d | 253 | struct list_head sched_list; |
1c00dd07 | 254 | struct ib_wc *wcs; |
8301a2c0 | 255 | int budget, count, rc; |
fc664485 | 256 | |
bb96193d | 257 | INIT_LIST_HEAD(&sched_list); |
8301a2c0 | 258 | budget = RPCRDMA_WC_BUDGET / RPCRDMA_POLLSIZE; |
1c00dd07 CL |
259 | do { |
260 | wcs = ep->rep_recv_wcs; | |
261 | ||
262 | rc = ib_poll_cq(cq, RPCRDMA_POLLSIZE, wcs); | |
263 | if (rc <= 0) | |
bb96193d | 264 | goto out_schedule; |
1c00dd07 CL |
265 | |
266 | count = rc; | |
267 | while (count-- > 0) | |
bb96193d | 268 | rpcrdma_recvcq_process_wc(wcs++, &sched_list); |
8301a2c0 | 269 | } while (rc == RPCRDMA_POLLSIZE && --budget); |
bb96193d CL |
270 | rc = 0; |
271 | ||
272 | out_schedule: | |
f1a03b76 | 273 | rpcrdma_schedule_tasklet(&sched_list); |
bb96193d | 274 | return rc; |
c56c65fb TT |
275 | } |
276 | ||
277 | /* | |
fc664485 | 278 | * Handle receive completions. |
c56c65fb | 279 | * |
c56c65fb TT |
280 | * It is reentrant but processes single events in order to maintain |
281 | * ordering of receives to keep server credits. | |
282 | * | |
283 | * It is the responsibility of the scheduled tasklet to return | |
284 | * recv buffers to the pool. NOTE: this affects synchronization of | |
285 | * connection shutdown. That is, the structures required for | |
286 | * the completion of the reply handler must remain intact until | |
287 | * all memory has been reclaimed. | |
c56c65fb TT |
288 | */ |
289 | static void | |
fc664485 | 290 | rpcrdma_recvcq_upcall(struct ib_cq *cq, void *cq_context) |
c56c65fb | 291 | { |
1c00dd07 | 292 | struct rpcrdma_ep *ep = (struct rpcrdma_ep *)cq_context; |
c56c65fb TT |
293 | int rc; |
294 | ||
1c00dd07 | 295 | rc = rpcrdma_recvcq_poll(cq, ep); |
fc664485 CL |
296 | if (rc) { |
297 | dprintk("RPC: %s: ib_poll_cq failed: %i\n", | |
298 | __func__, rc); | |
c56c65fb | 299 | return; |
fc664485 | 300 | } |
c56c65fb | 301 | |
7f23f6f6 CL |
302 | rc = ib_req_notify_cq(cq, |
303 | IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS); | |
304 | if (rc == 0) | |
305 | return; | |
306 | if (rc < 0) { | |
fc664485 | 307 | dprintk("RPC: %s: ib_req_notify_cq failed: %i\n", |
c56c65fb TT |
308 | __func__, rc); |
309 | return; | |
310 | } | |
311 | ||
1c00dd07 | 312 | rpcrdma_recvcq_poll(cq, ep); |
c56c65fb TT |
313 | } |
314 | ||
a7bc211a CL |
315 | static void |
316 | rpcrdma_flush_cqs(struct rpcrdma_ep *ep) | |
317 | { | |
5c166bef CL |
318 | struct ib_wc wc; |
319 | LIST_HEAD(sched_list); | |
320 | ||
321 | while (ib_poll_cq(ep->rep_attr.recv_cq, 1, &wc) > 0) | |
322 | rpcrdma_recvcq_process_wc(&wc, &sched_list); | |
323 | if (!list_empty(&sched_list)) | |
324 | rpcrdma_schedule_tasklet(&sched_list); | |
325 | while (ib_poll_cq(ep->rep_attr.send_cq, 1, &wc) > 0) | |
326 | rpcrdma_sendcq_process_wc(&wc); | |
a7bc211a CL |
327 | } |
328 | ||
c56c65fb TT |
329 | static int |
330 | rpcrdma_conn_upcall(struct rdma_cm_id *id, struct rdma_cm_event *event) | |
331 | { | |
332 | struct rpcrdma_xprt *xprt = id->context; | |
333 | struct rpcrdma_ia *ia = &xprt->rx_ia; | |
334 | struct rpcrdma_ep *ep = &xprt->rx_ep; | |
f895b252 | 335 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
0dd39cae | 336 | struct sockaddr *sap = (struct sockaddr *)&ep->rep_remote_addr; |
ff0db049 | 337 | #endif |
ce1ab9ab CL |
338 | struct ib_qp_attr *attr = &ia->ri_qp_attr; |
339 | struct ib_qp_init_attr *iattr = &ia->ri_qp_init_attr; | |
c56c65fb TT |
340 | int connstate = 0; |
341 | ||
342 | switch (event->event) { | |
343 | case RDMA_CM_EVENT_ADDR_RESOLVED: | |
344 | case RDMA_CM_EVENT_ROUTE_RESOLVED: | |
5675add3 | 345 | ia->ri_async_rc = 0; |
c56c65fb TT |
346 | complete(&ia->ri_done); |
347 | break; | |
348 | case RDMA_CM_EVENT_ADDR_ERROR: | |
349 | ia->ri_async_rc = -EHOSTUNREACH; | |
350 | dprintk("RPC: %s: CM address resolution error, ep 0x%p\n", | |
351 | __func__, ep); | |
352 | complete(&ia->ri_done); | |
353 | break; | |
354 | case RDMA_CM_EVENT_ROUTE_ERROR: | |
355 | ia->ri_async_rc = -ENETUNREACH; | |
356 | dprintk("RPC: %s: CM route resolution error, ep 0x%p\n", | |
357 | __func__, ep); | |
358 | complete(&ia->ri_done); | |
359 | break; | |
360 | case RDMA_CM_EVENT_ESTABLISHED: | |
361 | connstate = 1; | |
ce1ab9ab CL |
362 | ib_query_qp(ia->ri_id->qp, attr, |
363 | IB_QP_MAX_QP_RD_ATOMIC | IB_QP_MAX_DEST_RD_ATOMIC, | |
364 | iattr); | |
c56c65fb TT |
365 | dprintk("RPC: %s: %d responder resources" |
366 | " (%d initiator)\n", | |
ce1ab9ab CL |
367 | __func__, attr->max_dest_rd_atomic, |
368 | attr->max_rd_atomic); | |
c56c65fb TT |
369 | goto connected; |
370 | case RDMA_CM_EVENT_CONNECT_ERROR: | |
371 | connstate = -ENOTCONN; | |
372 | goto connected; | |
373 | case RDMA_CM_EVENT_UNREACHABLE: | |
374 | connstate = -ENETDOWN; | |
375 | goto connected; | |
376 | case RDMA_CM_EVENT_REJECTED: | |
377 | connstate = -ECONNREFUSED; | |
378 | goto connected; | |
379 | case RDMA_CM_EVENT_DISCONNECTED: | |
380 | connstate = -ECONNABORTED; | |
381 | goto connected; | |
382 | case RDMA_CM_EVENT_DEVICE_REMOVAL: | |
383 | connstate = -ENODEV; | |
384 | connected: | |
c56c65fb TT |
385 | dprintk("RPC: %s: %sconnected\n", |
386 | __func__, connstate > 0 ? "" : "dis"); | |
387 | ep->rep_connected = connstate; | |
afadc468 | 388 | rpcrdma_conn_func(ep); |
c56c65fb | 389 | wake_up_all(&ep->rep_connect_wait); |
8079fb78 | 390 | /*FALLTHROUGH*/ |
c56c65fb | 391 | default: |
0dd39cae CL |
392 | dprintk("RPC: %s: %pIS:%u (ep 0x%p): %s\n", |
393 | __func__, sap, rpc_get_port(sap), ep, | |
76357c71 | 394 | rdma_event_msg(event->event)); |
c56c65fb TT |
395 | break; |
396 | } | |
397 | ||
f895b252 | 398 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
b3cd8d45 | 399 | if (connstate == 1) { |
ce1ab9ab | 400 | int ird = attr->max_dest_rd_atomic; |
b3cd8d45 | 401 | int tird = ep->rep_remote_cma.responder_resources; |
0dd39cae | 402 | |
a0ce85f5 | 403 | pr_info("rpcrdma: connection to %pIS:%u on %s, memreg '%s', %d credits, %d responders%s\n", |
0dd39cae | 404 | sap, rpc_get_port(sap), |
89e0d112 | 405 | ia->ri_device->name, |
a0ce85f5 | 406 | ia->ri_ops->ro_displayname, |
b3cd8d45 TT |
407 | xprt->rx_buf.rb_max_requests, |
408 | ird, ird < 4 && ird < tird / 2 ? " (low!)" : ""); | |
409 | } else if (connstate < 0) { | |
0dd39cae CL |
410 | pr_info("rpcrdma: connection to %pIS:%u closed (%d)\n", |
411 | sap, rpc_get_port(sap), connstate); | |
b3cd8d45 TT |
412 | } |
413 | #endif | |
414 | ||
c56c65fb TT |
415 | return 0; |
416 | } | |
417 | ||
d0f36c46 DS |
418 | static void rpcrdma_destroy_id(struct rdma_cm_id *id) |
419 | { | |
420 | if (id) { | |
421 | module_put(id->device->owner); | |
422 | rdma_destroy_id(id); | |
423 | } | |
424 | } | |
425 | ||
c56c65fb TT |
426 | static struct rdma_cm_id * |
427 | rpcrdma_create_id(struct rpcrdma_xprt *xprt, | |
428 | struct rpcrdma_ia *ia, struct sockaddr *addr) | |
429 | { | |
430 | struct rdma_cm_id *id; | |
431 | int rc; | |
432 | ||
1a954051 TT |
433 | init_completion(&ia->ri_done); |
434 | ||
b26f9b99 | 435 | id = rdma_create_id(rpcrdma_conn_upcall, xprt, RDMA_PS_TCP, IB_QPT_RC); |
c56c65fb TT |
436 | if (IS_ERR(id)) { |
437 | rc = PTR_ERR(id); | |
438 | dprintk("RPC: %s: rdma_create_id() failed %i\n", | |
439 | __func__, rc); | |
440 | return id; | |
441 | } | |
442 | ||
5675add3 | 443 | ia->ri_async_rc = -ETIMEDOUT; |
c56c65fb TT |
444 | rc = rdma_resolve_addr(id, NULL, addr, RDMA_RESOLVE_TIMEOUT); |
445 | if (rc) { | |
446 | dprintk("RPC: %s: rdma_resolve_addr() failed %i\n", | |
447 | __func__, rc); | |
448 | goto out; | |
449 | } | |
5675add3 TT |
450 | wait_for_completion_interruptible_timeout(&ia->ri_done, |
451 | msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1); | |
d0f36c46 DS |
452 | |
453 | /* FIXME: | |
454 | * Until xprtrdma supports DEVICE_REMOVAL, the provider must | |
455 | * be pinned while there are active NFS/RDMA mounts to prevent | |
456 | * hangs and crashes at umount time. | |
457 | */ | |
458 | if (!ia->ri_async_rc && !try_module_get(id->device->owner)) { | |
459 | dprintk("RPC: %s: Failed to get device module\n", | |
460 | __func__); | |
461 | ia->ri_async_rc = -ENODEV; | |
462 | } | |
c56c65fb TT |
463 | rc = ia->ri_async_rc; |
464 | if (rc) | |
465 | goto out; | |
466 | ||
5675add3 | 467 | ia->ri_async_rc = -ETIMEDOUT; |
c56c65fb TT |
468 | rc = rdma_resolve_route(id, RDMA_RESOLVE_TIMEOUT); |
469 | if (rc) { | |
470 | dprintk("RPC: %s: rdma_resolve_route() failed %i\n", | |
471 | __func__, rc); | |
d0f36c46 | 472 | goto put; |
c56c65fb | 473 | } |
5675add3 TT |
474 | wait_for_completion_interruptible_timeout(&ia->ri_done, |
475 | msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1); | |
c56c65fb TT |
476 | rc = ia->ri_async_rc; |
477 | if (rc) | |
d0f36c46 | 478 | goto put; |
c56c65fb TT |
479 | |
480 | return id; | |
d0f36c46 DS |
481 | put: |
482 | module_put(id->device->owner); | |
c56c65fb TT |
483 | out: |
484 | rdma_destroy_id(id); | |
485 | return ERR_PTR(rc); | |
486 | } | |
487 | ||
488 | /* | |
489 | * Drain any cq, prior to teardown. | |
490 | */ | |
491 | static void | |
492 | rpcrdma_clean_cq(struct ib_cq *cq) | |
493 | { | |
494 | struct ib_wc wc; | |
495 | int count = 0; | |
496 | ||
497 | while (1 == ib_poll_cq(cq, 1, &wc)) | |
498 | ++count; | |
499 | ||
500 | if (count) | |
501 | dprintk("RPC: %s: flushed %d events (last 0x%x)\n", | |
502 | __func__, count, wc.opcode); | |
503 | } | |
504 | ||
505 | /* | |
506 | * Exported functions. | |
507 | */ | |
508 | ||
509 | /* | |
510 | * Open and initialize an Interface Adapter. | |
511 | * o initializes fields of struct rpcrdma_ia, including | |
512 | * interface and provider attributes and protection zone. | |
513 | */ | |
514 | int | |
515 | rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg) | |
516 | { | |
c56c65fb | 517 | struct rpcrdma_ia *ia = &xprt->rx_ia; |
7bc7972c | 518 | struct ib_device_attr *devattr = &ia->ri_devattr; |
d1ed857e CL |
519 | int rc; |
520 | ||
521 | ia->ri_dma_mr = NULL; | |
c56c65fb | 522 | |
c56c65fb TT |
523 | ia->ri_id = rpcrdma_create_id(xprt, ia, addr); |
524 | if (IS_ERR(ia->ri_id)) { | |
525 | rc = PTR_ERR(ia->ri_id); | |
526 | goto out1; | |
527 | } | |
89e0d112 | 528 | ia->ri_device = ia->ri_id->device; |
c56c65fb | 529 | |
89e0d112 | 530 | ia->ri_pd = ib_alloc_pd(ia->ri_device); |
c56c65fb TT |
531 | if (IS_ERR(ia->ri_pd)) { |
532 | rc = PTR_ERR(ia->ri_pd); | |
533 | dprintk("RPC: %s: ib_alloc_pd() failed %i\n", | |
534 | __func__, rc); | |
535 | goto out2; | |
536 | } | |
537 | ||
89e0d112 | 538 | rc = ib_query_device(ia->ri_device, devattr); |
bd7ed1d1 TT |
539 | if (rc) { |
540 | dprintk("RPC: %s: ib_query_device failed %d\n", | |
541 | __func__, rc); | |
5ae711a2 | 542 | goto out3; |
bd7ed1d1 TT |
543 | } |
544 | ||
f10eafd3 | 545 | if (memreg == RPCRDMA_FRMR) { |
3197d309 | 546 | /* Requires both frmr reg and local dma lkey */ |
41f97028 | 547 | if (((devattr->device_cap_flags & |
3197d309 | 548 | (IB_DEVICE_MEM_MGT_EXTENSIONS|IB_DEVICE_LOCAL_DMA_LKEY)) != |
41f97028 CL |
549 | (IB_DEVICE_MEM_MGT_EXTENSIONS|IB_DEVICE_LOCAL_DMA_LKEY)) || |
550 | (devattr->max_fast_reg_page_list_len == 0)) { | |
3197d309 | 551 | dprintk("RPC: %s: FRMR registration " |
f10eafd3 CL |
552 | "not supported by HCA\n", __func__); |
553 | memreg = RPCRDMA_MTHCAFMR; | |
bd7ed1d1 | 554 | } |
f10eafd3 CL |
555 | } |
556 | if (memreg == RPCRDMA_MTHCAFMR) { | |
89e0d112 | 557 | if (!ia->ri_device->alloc_fmr) { |
f10eafd3 CL |
558 | dprintk("RPC: %s: MTHCAFMR registration " |
559 | "not supported by HCA\n", __func__); | |
d2310930 | 560 | goto out3; |
f10eafd3 | 561 | } |
bd7ed1d1 TT |
562 | } |
563 | ||
bd7ed1d1 | 564 | switch (memreg) { |
3197d309 | 565 | case RPCRDMA_FRMR: |
a0ce85f5 | 566 | ia->ri_ops = &rpcrdma_frwr_memreg_ops; |
bd7ed1d1 | 567 | break; |
bd7ed1d1 | 568 | case RPCRDMA_ALLPHYSICAL: |
a0ce85f5 | 569 | ia->ri_ops = &rpcrdma_physical_memreg_ops; |
d1ed857e | 570 | break; |
bd7ed1d1 | 571 | case RPCRDMA_MTHCAFMR: |
a0ce85f5 | 572 | ia->ri_ops = &rpcrdma_fmr_memreg_ops; |
bd7ed1d1 TT |
573 | break; |
574 | default: | |
cdd9ade7 CL |
575 | printk(KERN_ERR "RPC: Unsupported memory " |
576 | "registration mode: %d\n", memreg); | |
577 | rc = -ENOMEM; | |
5ae711a2 | 578 | goto out3; |
c56c65fb | 579 | } |
a0ce85f5 CL |
580 | dprintk("RPC: %s: memory registration strategy is '%s'\n", |
581 | __func__, ia->ri_ops->ro_displayname); | |
c56c65fb | 582 | |
73806c88 | 583 | rwlock_init(&ia->ri_qplock); |
c56c65fb | 584 | return 0; |
5ae711a2 CL |
585 | |
586 | out3: | |
587 | ib_dealloc_pd(ia->ri_pd); | |
588 | ia->ri_pd = NULL; | |
c56c65fb | 589 | out2: |
d0f36c46 | 590 | rpcrdma_destroy_id(ia->ri_id); |
fee08caf | 591 | ia->ri_id = NULL; |
c56c65fb TT |
592 | out1: |
593 | return rc; | |
594 | } | |
595 | ||
596 | /* | |
597 | * Clean up/close an IA. | |
598 | * o if event handles and PD have been initialized, free them. | |
599 | * o close the IA | |
600 | */ | |
601 | void | |
602 | rpcrdma_ia_close(struct rpcrdma_ia *ia) | |
603 | { | |
c56c65fb | 604 | dprintk("RPC: %s: entering\n", __func__); |
fee08caf TT |
605 | if (ia->ri_id != NULL && !IS_ERR(ia->ri_id)) { |
606 | if (ia->ri_id->qp) | |
607 | rdma_destroy_qp(ia->ri_id); | |
d0f36c46 | 608 | rpcrdma_destroy_id(ia->ri_id); |
fee08caf TT |
609 | ia->ri_id = NULL; |
610 | } | |
6d44698d CL |
611 | |
612 | /* If the pd is still busy, xprtrdma missed freeing a resource */ | |
613 | if (ia->ri_pd && !IS_ERR(ia->ri_pd)) | |
7dd78647 | 614 | ib_dealloc_pd(ia->ri_pd); |
c56c65fb TT |
615 | } |
616 | ||
617 | /* | |
618 | * Create unconnected endpoint. | |
619 | */ | |
620 | int | |
621 | rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia, | |
622 | struct rpcrdma_create_data_internal *cdata) | |
623 | { | |
7bc7972c | 624 | struct ib_device_attr *devattr = &ia->ri_devattr; |
fc664485 | 625 | struct ib_cq *sendcq, *recvcq; |
8e37210b | 626 | struct ib_cq_init_attr cq_attr = {}; |
5d40a8a5 | 627 | int rc, err; |
c56c65fb | 628 | |
b3221d6a CL |
629 | if (devattr->max_sge < RPCRDMA_MAX_IOVS) { |
630 | dprintk("RPC: %s: insufficient sge's available\n", | |
631 | __func__); | |
632 | return -ENOMEM; | |
633 | } | |
634 | ||
c56c65fb | 635 | /* check provider's send/recv wr limits */ |
7bc7972c CL |
636 | if (cdata->max_requests > devattr->max_qp_wr) |
637 | cdata->max_requests = devattr->max_qp_wr; | |
c56c65fb TT |
638 | |
639 | ep->rep_attr.event_handler = rpcrdma_qp_async_error_upcall; | |
640 | ep->rep_attr.qp_context = ep; | |
c56c65fb TT |
641 | ep->rep_attr.srq = NULL; |
642 | ep->rep_attr.cap.max_send_wr = cdata->max_requests; | |
3968cb58 CL |
643 | rc = ia->ri_ops->ro_open(ia, ep, cdata); |
644 | if (rc) | |
645 | return rc; | |
c56c65fb | 646 | ep->rep_attr.cap.max_recv_wr = cdata->max_requests; |
b3221d6a | 647 | ep->rep_attr.cap.max_send_sge = RPCRDMA_MAX_IOVS; |
c56c65fb TT |
648 | ep->rep_attr.cap.max_recv_sge = 1; |
649 | ep->rep_attr.cap.max_inline_data = 0; | |
650 | ep->rep_attr.sq_sig_type = IB_SIGNAL_REQ_WR; | |
651 | ep->rep_attr.qp_type = IB_QPT_RC; | |
652 | ep->rep_attr.port_num = ~0; | |
653 | ||
654 | dprintk("RPC: %s: requested max: dtos: send %d recv %d; " | |
655 | "iovs: send %d recv %d\n", | |
656 | __func__, | |
657 | ep->rep_attr.cap.max_send_wr, | |
658 | ep->rep_attr.cap.max_recv_wr, | |
659 | ep->rep_attr.cap.max_send_sge, | |
660 | ep->rep_attr.cap.max_recv_sge); | |
661 | ||
662 | /* set trigger for requesting send completion */ | |
fc664485 | 663 | ep->rep_cqinit = ep->rep_attr.cap.max_send_wr/2 - 1; |
e7104a2a CL |
664 | if (ep->rep_cqinit > RPCRDMA_MAX_UNSIGNALED_SENDS) |
665 | ep->rep_cqinit = RPCRDMA_MAX_UNSIGNALED_SENDS; | |
666 | else if (ep->rep_cqinit <= 2) | |
c56c65fb TT |
667 | ep->rep_cqinit = 0; |
668 | INIT_CQCOUNT(ep); | |
c56c65fb | 669 | init_waitqueue_head(&ep->rep_connect_wait); |
254f91e2 | 670 | INIT_DELAYED_WORK(&ep->rep_connect_worker, rpcrdma_connect_worker); |
c56c65fb | 671 | |
8e37210b | 672 | cq_attr.cqe = ep->rep_attr.cap.max_send_wr + 1; |
89e0d112 | 673 | sendcq = ib_create_cq(ia->ri_device, rpcrdma_sendcq_upcall, |
8688d954 | 674 | rpcrdma_cq_async_error_upcall, ep, &cq_attr); |
fc664485 CL |
675 | if (IS_ERR(sendcq)) { |
676 | rc = PTR_ERR(sendcq); | |
677 | dprintk("RPC: %s: failed to create send CQ: %i\n", | |
c56c65fb TT |
678 | __func__, rc); |
679 | goto out1; | |
680 | } | |
681 | ||
fc664485 | 682 | rc = ib_req_notify_cq(sendcq, IB_CQ_NEXT_COMP); |
c56c65fb TT |
683 | if (rc) { |
684 | dprintk("RPC: %s: ib_req_notify_cq failed: %i\n", | |
685 | __func__, rc); | |
686 | goto out2; | |
687 | } | |
688 | ||
8e37210b | 689 | cq_attr.cqe = ep->rep_attr.cap.max_recv_wr + 1; |
89e0d112 | 690 | recvcq = ib_create_cq(ia->ri_device, rpcrdma_recvcq_upcall, |
8688d954 | 691 | rpcrdma_cq_async_error_upcall, ep, &cq_attr); |
fc664485 CL |
692 | if (IS_ERR(recvcq)) { |
693 | rc = PTR_ERR(recvcq); | |
694 | dprintk("RPC: %s: failed to create recv CQ: %i\n", | |
695 | __func__, rc); | |
696 | goto out2; | |
697 | } | |
698 | ||
699 | rc = ib_req_notify_cq(recvcq, IB_CQ_NEXT_COMP); | |
700 | if (rc) { | |
701 | dprintk("RPC: %s: ib_req_notify_cq failed: %i\n", | |
702 | __func__, rc); | |
703 | ib_destroy_cq(recvcq); | |
704 | goto out2; | |
705 | } | |
706 | ||
707 | ep->rep_attr.send_cq = sendcq; | |
708 | ep->rep_attr.recv_cq = recvcq; | |
c56c65fb TT |
709 | |
710 | /* Initialize cma parameters */ | |
711 | ||
712 | /* RPC/RDMA does not use private data */ | |
713 | ep->rep_remote_cma.private_data = NULL; | |
714 | ep->rep_remote_cma.private_data_len = 0; | |
715 | ||
716 | /* Client offers RDMA Read but does not initiate */ | |
b334eaab | 717 | ep->rep_remote_cma.initiator_depth = 0; |
7bc7972c | 718 | if (devattr->max_qp_rd_atom > 32) /* arbitrary but <= 255 */ |
b334eaab TT |
719 | ep->rep_remote_cma.responder_resources = 32; |
720 | else | |
7bc7972c CL |
721 | ep->rep_remote_cma.responder_resources = |
722 | devattr->max_qp_rd_atom; | |
c56c65fb TT |
723 | |
724 | ep->rep_remote_cma.retry_count = 7; | |
725 | ep->rep_remote_cma.flow_control = 0; | |
726 | ep->rep_remote_cma.rnr_retry_count = 0; | |
727 | ||
728 | return 0; | |
729 | ||
730 | out2: | |
fc664485 | 731 | err = ib_destroy_cq(sendcq); |
5d40a8a5 CL |
732 | if (err) |
733 | dprintk("RPC: %s: ib_destroy_cq returned %i\n", | |
734 | __func__, err); | |
c56c65fb | 735 | out1: |
d1ed857e CL |
736 | if (ia->ri_dma_mr) |
737 | ib_dereg_mr(ia->ri_dma_mr); | |
c56c65fb TT |
738 | return rc; |
739 | } | |
740 | ||
741 | /* | |
742 | * rpcrdma_ep_destroy | |
743 | * | |
744 | * Disconnect and destroy endpoint. After this, the only | |
745 | * valid operations on the ep are to free it (if dynamically | |
746 | * allocated) or re-create it. | |
c56c65fb | 747 | */ |
7f1d5419 | 748 | void |
c56c65fb TT |
749 | rpcrdma_ep_destroy(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) |
750 | { | |
751 | int rc; | |
752 | ||
753 | dprintk("RPC: %s: entering, connected is %d\n", | |
754 | __func__, ep->rep_connected); | |
755 | ||
254f91e2 CL |
756 | cancel_delayed_work_sync(&ep->rep_connect_worker); |
757 | ||
c56c65fb | 758 | if (ia->ri_id->qp) { |
282191cb | 759 | rpcrdma_ep_disconnect(ep, ia); |
fee08caf TT |
760 | rdma_destroy_qp(ia->ri_id); |
761 | ia->ri_id->qp = NULL; | |
c56c65fb TT |
762 | } |
763 | ||
fc664485 CL |
764 | rpcrdma_clean_cq(ep->rep_attr.recv_cq); |
765 | rc = ib_destroy_cq(ep->rep_attr.recv_cq); | |
766 | if (rc) | |
767 | dprintk("RPC: %s: ib_destroy_cq returned %i\n", | |
768 | __func__, rc); | |
769 | ||
770 | rpcrdma_clean_cq(ep->rep_attr.send_cq); | |
771 | rc = ib_destroy_cq(ep->rep_attr.send_cq); | |
c56c65fb TT |
772 | if (rc) |
773 | dprintk("RPC: %s: ib_destroy_cq returned %i\n", | |
774 | __func__, rc); | |
d1ed857e CL |
775 | |
776 | if (ia->ri_dma_mr) { | |
777 | rc = ib_dereg_mr(ia->ri_dma_mr); | |
778 | dprintk("RPC: %s: ib_dereg_mr returned %i\n", | |
779 | __func__, rc); | |
780 | } | |
c56c65fb TT |
781 | } |
782 | ||
783 | /* | |
784 | * Connect unconnected endpoint. | |
785 | */ | |
786 | int | |
787 | rpcrdma_ep_connect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) | |
788 | { | |
73806c88 | 789 | struct rdma_cm_id *id, *old; |
c56c65fb TT |
790 | int rc = 0; |
791 | int retry_count = 0; | |
c56c65fb | 792 | |
c055551e | 793 | if (ep->rep_connected != 0) { |
c56c65fb TT |
794 | struct rpcrdma_xprt *xprt; |
795 | retry: | |
ec62f40d | 796 | dprintk("RPC: %s: reconnecting...\n", __func__); |
282191cb CL |
797 | |
798 | rpcrdma_ep_disconnect(ep, ia); | |
a7bc211a | 799 | rpcrdma_flush_cqs(ep); |
c56c65fb TT |
800 | |
801 | xprt = container_of(ia, struct rpcrdma_xprt, rx_ia); | |
802 | id = rpcrdma_create_id(xprt, ia, | |
803 | (struct sockaddr *)&xprt->rx_data.addr); | |
804 | if (IS_ERR(id)) { | |
ec62f40d | 805 | rc = -EHOSTUNREACH; |
c56c65fb TT |
806 | goto out; |
807 | } | |
808 | /* TEMP TEMP TEMP - fail if new device: | |
809 | * Deregister/remarshal *all* requests! | |
810 | * Close and recreate adapter, pd, etc! | |
811 | * Re-determine all attributes still sane! | |
812 | * More stuff I haven't thought of! | |
813 | * Rrrgh! | |
814 | */ | |
89e0d112 | 815 | if (ia->ri_device != id->device) { |
c56c65fb TT |
816 | printk("RPC: %s: can't reconnect on " |
817 | "different device!\n", __func__); | |
d0f36c46 | 818 | rpcrdma_destroy_id(id); |
ec62f40d | 819 | rc = -ENETUNREACH; |
c56c65fb TT |
820 | goto out; |
821 | } | |
822 | /* END TEMP */ | |
ec62f40d CL |
823 | rc = rdma_create_qp(id, ia->ri_pd, &ep->rep_attr); |
824 | if (rc) { | |
825 | dprintk("RPC: %s: rdma_create_qp failed %i\n", | |
826 | __func__, rc); | |
d0f36c46 | 827 | rpcrdma_destroy_id(id); |
ec62f40d CL |
828 | rc = -ENETUNREACH; |
829 | goto out; | |
830 | } | |
73806c88 CL |
831 | |
832 | write_lock(&ia->ri_qplock); | |
833 | old = ia->ri_id; | |
c56c65fb | 834 | ia->ri_id = id; |
73806c88 CL |
835 | write_unlock(&ia->ri_qplock); |
836 | ||
837 | rdma_destroy_qp(old); | |
d0f36c46 | 838 | rpcrdma_destroy_id(old); |
ec62f40d CL |
839 | } else { |
840 | dprintk("RPC: %s: connecting...\n", __func__); | |
841 | rc = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr); | |
842 | if (rc) { | |
843 | dprintk("RPC: %s: rdma_create_qp failed %i\n", | |
844 | __func__, rc); | |
845 | /* do not update ep->rep_connected */ | |
846 | return -ENETUNREACH; | |
847 | } | |
c56c65fb TT |
848 | } |
849 | ||
c56c65fb TT |
850 | ep->rep_connected = 0; |
851 | ||
852 | rc = rdma_connect(ia->ri_id, &ep->rep_remote_cma); | |
853 | if (rc) { | |
854 | dprintk("RPC: %s: rdma_connect() failed with %i\n", | |
855 | __func__, rc); | |
856 | goto out; | |
857 | } | |
858 | ||
c56c65fb TT |
859 | wait_event_interruptible(ep->rep_connect_wait, ep->rep_connected != 0); |
860 | ||
861 | /* | |
862 | * Check state. A non-peer reject indicates no listener | |
863 | * (ECONNREFUSED), which may be a transient state. All | |
864 | * others indicate a transport condition which has already | |
865 | * undergone a best-effort. | |
866 | */ | |
f64f9e71 JP |
867 | if (ep->rep_connected == -ECONNREFUSED && |
868 | ++retry_count <= RDMA_CONNECT_RETRY_MAX) { | |
c56c65fb TT |
869 | dprintk("RPC: %s: non-peer_reject, retry\n", __func__); |
870 | goto retry; | |
871 | } | |
872 | if (ep->rep_connected <= 0) { | |
873 | /* Sometimes, the only way to reliably connect to remote | |
874 | * CMs is to use same nonzero values for ORD and IRD. */ | |
b334eaab TT |
875 | if (retry_count++ <= RDMA_CONNECT_RETRY_MAX + 1 && |
876 | (ep->rep_remote_cma.responder_resources == 0 || | |
877 | ep->rep_remote_cma.initiator_depth != | |
878 | ep->rep_remote_cma.responder_resources)) { | |
879 | if (ep->rep_remote_cma.responder_resources == 0) | |
880 | ep->rep_remote_cma.responder_resources = 1; | |
881 | ep->rep_remote_cma.initiator_depth = | |
882 | ep->rep_remote_cma.responder_resources; | |
c56c65fb | 883 | goto retry; |
b334eaab | 884 | } |
c56c65fb TT |
885 | rc = ep->rep_connected; |
886 | } else { | |
887 | dprintk("RPC: %s: connected\n", __func__); | |
888 | } | |
889 | ||
890 | out: | |
891 | if (rc) | |
892 | ep->rep_connected = rc; | |
893 | return rc; | |
894 | } | |
895 | ||
896 | /* | |
897 | * rpcrdma_ep_disconnect | |
898 | * | |
899 | * This is separate from destroy to facilitate the ability | |
900 | * to reconnect without recreating the endpoint. | |
901 | * | |
902 | * This call is not reentrant, and must not be made in parallel | |
903 | * on the same endpoint. | |
904 | */ | |
282191cb | 905 | void |
c56c65fb TT |
906 | rpcrdma_ep_disconnect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) |
907 | { | |
908 | int rc; | |
909 | ||
a7bc211a | 910 | rpcrdma_flush_cqs(ep); |
c56c65fb TT |
911 | rc = rdma_disconnect(ia->ri_id); |
912 | if (!rc) { | |
913 | /* returns without wait if not connected */ | |
914 | wait_event_interruptible(ep->rep_connect_wait, | |
915 | ep->rep_connected != 1); | |
916 | dprintk("RPC: %s: after wait, %sconnected\n", __func__, | |
917 | (ep->rep_connected == 1) ? "still " : "dis"); | |
918 | } else { | |
919 | dprintk("RPC: %s: rdma_disconnect %i\n", __func__, rc); | |
920 | ep->rep_connected = rc; | |
921 | } | |
c56c65fb TT |
922 | } |
923 | ||
1392402c CL |
924 | static struct rpcrdma_req * |
925 | rpcrdma_create_req(struct rpcrdma_xprt *r_xprt) | |
926 | { | |
1392402c | 927 | struct rpcrdma_req *req; |
1392402c | 928 | |
85275c87 | 929 | req = kzalloc(sizeof(*req), GFP_KERNEL); |
1392402c | 930 | if (req == NULL) |
85275c87 | 931 | return ERR_PTR(-ENOMEM); |
1392402c | 932 | |
1392402c CL |
933 | req->rl_buffer = &r_xprt->rx_buf; |
934 | return req; | |
1392402c CL |
935 | } |
936 | ||
937 | static struct rpcrdma_rep * | |
938 | rpcrdma_create_rep(struct rpcrdma_xprt *r_xprt) | |
939 | { | |
940 | struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data; | |
1392402c CL |
941 | struct rpcrdma_ia *ia = &r_xprt->rx_ia; |
942 | struct rpcrdma_rep *rep; | |
943 | int rc; | |
944 | ||
945 | rc = -ENOMEM; | |
6b1184cd | 946 | rep = kzalloc(sizeof(*rep), GFP_KERNEL); |
1392402c CL |
947 | if (rep == NULL) |
948 | goto out; | |
1392402c | 949 | |
6b1184cd CL |
950 | rep->rr_rdmabuf = rpcrdma_alloc_regbuf(ia, cdata->inline_rsize, |
951 | GFP_KERNEL); | |
952 | if (IS_ERR(rep->rr_rdmabuf)) { | |
953 | rc = PTR_ERR(rep->rr_rdmabuf); | |
1392402c | 954 | goto out_free; |
6b1184cd | 955 | } |
1392402c | 956 | |
89e0d112 | 957 | rep->rr_device = ia->ri_device; |
fed171b3 | 958 | rep->rr_rxprt = r_xprt; |
1392402c CL |
959 | return rep; |
960 | ||
961 | out_free: | |
962 | kfree(rep); | |
963 | out: | |
964 | return ERR_PTR(rc); | |
965 | } | |
966 | ||
c56c65fb | 967 | int |
ac920d04 | 968 | rpcrdma_buffer_create(struct rpcrdma_xprt *r_xprt) |
c56c65fb | 969 | { |
ac920d04 CL |
970 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; |
971 | struct rpcrdma_ia *ia = &r_xprt->rx_ia; | |
972 | struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data; | |
c56c65fb | 973 | char *p; |
1392402c | 974 | size_t len; |
c56c65fb TT |
975 | int i, rc; |
976 | ||
977 | buf->rb_max_requests = cdata->max_requests; | |
978 | spin_lock_init(&buf->rb_lock); | |
c56c65fb TT |
979 | |
980 | /* Need to allocate: | |
981 | * 1. arrays for send and recv pointers | |
982 | * 2. arrays of struct rpcrdma_req to fill in pointers | |
983 | * 3. array of struct rpcrdma_rep for replies | |
c56c65fb TT |
984 | * Send/recv buffers in req/rep need to be registered |
985 | */ | |
c56c65fb TT |
986 | len = buf->rb_max_requests * |
987 | (sizeof(struct rpcrdma_req *) + sizeof(struct rpcrdma_rep *)); | |
c56c65fb | 988 | |
c56c65fb TT |
989 | p = kzalloc(len, GFP_KERNEL); |
990 | if (p == NULL) { | |
991 | dprintk("RPC: %s: req_t/rep_t/pad kzalloc(%zd) failed\n", | |
992 | __func__, len); | |
993 | rc = -ENOMEM; | |
994 | goto out; | |
995 | } | |
996 | buf->rb_pool = p; /* for freeing it later */ | |
997 | ||
998 | buf->rb_send_bufs = (struct rpcrdma_req **) p; | |
999 | p = (char *) &buf->rb_send_bufs[buf->rb_max_requests]; | |
1000 | buf->rb_recv_bufs = (struct rpcrdma_rep **) p; | |
1001 | p = (char *) &buf->rb_recv_bufs[buf->rb_max_requests]; | |
1002 | ||
91e70e70 CL |
1003 | rc = ia->ri_ops->ro_init(r_xprt); |
1004 | if (rc) | |
1005 | goto out; | |
c56c65fb | 1006 | |
c56c65fb TT |
1007 | for (i = 0; i < buf->rb_max_requests; i++) { |
1008 | struct rpcrdma_req *req; | |
1009 | struct rpcrdma_rep *rep; | |
1010 | ||
1392402c CL |
1011 | req = rpcrdma_create_req(r_xprt); |
1012 | if (IS_ERR(req)) { | |
c56c65fb TT |
1013 | dprintk("RPC: %s: request buffer %d alloc" |
1014 | " failed\n", __func__, i); | |
1392402c | 1015 | rc = PTR_ERR(req); |
c56c65fb TT |
1016 | goto out; |
1017 | } | |
c56c65fb | 1018 | buf->rb_send_bufs[i] = req; |
c56c65fb | 1019 | |
1392402c CL |
1020 | rep = rpcrdma_create_rep(r_xprt); |
1021 | if (IS_ERR(rep)) { | |
c56c65fb TT |
1022 | dprintk("RPC: %s: reply buffer %d alloc failed\n", |
1023 | __func__, i); | |
1392402c | 1024 | rc = PTR_ERR(rep); |
c56c65fb TT |
1025 | goto out; |
1026 | } | |
c56c65fb | 1027 | buf->rb_recv_bufs[i] = rep; |
c56c65fb | 1028 | } |
1392402c | 1029 | |
c56c65fb TT |
1030 | return 0; |
1031 | out: | |
1032 | rpcrdma_buffer_destroy(buf); | |
1033 | return rc; | |
1034 | } | |
1035 | ||
1392402c CL |
1036 | static void |
1037 | rpcrdma_destroy_rep(struct rpcrdma_ia *ia, struct rpcrdma_rep *rep) | |
1038 | { | |
1039 | if (!rep) | |
1040 | return; | |
1041 | ||
6b1184cd | 1042 | rpcrdma_free_regbuf(ia, rep->rr_rdmabuf); |
1392402c CL |
1043 | kfree(rep); |
1044 | } | |
1045 | ||
1046 | static void | |
1047 | rpcrdma_destroy_req(struct rpcrdma_ia *ia, struct rpcrdma_req *req) | |
1048 | { | |
1049 | if (!req) | |
1050 | return; | |
1051 | ||
0ca77dc3 | 1052 | rpcrdma_free_regbuf(ia, req->rl_sendbuf); |
85275c87 | 1053 | rpcrdma_free_regbuf(ia, req->rl_rdmabuf); |
1392402c CL |
1054 | kfree(req); |
1055 | } | |
1056 | ||
c56c65fb TT |
1057 | void |
1058 | rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf) | |
1059 | { | |
c56c65fb | 1060 | struct rpcrdma_ia *ia = rdmab_to_ia(buf); |
2e84522c | 1061 | int i; |
c56c65fb TT |
1062 | |
1063 | /* clean up in reverse order from create | |
1064 | * 1. recv mr memory (mr free, then kfree) | |
c56c65fb | 1065 | * 2. send mr memory (mr free, then kfree) |
2e84522c | 1066 | * 3. MWs |
c56c65fb TT |
1067 | */ |
1068 | dprintk("RPC: %s: entering\n", __func__); | |
1069 | ||
1070 | for (i = 0; i < buf->rb_max_requests; i++) { | |
1392402c CL |
1071 | if (buf->rb_recv_bufs) |
1072 | rpcrdma_destroy_rep(ia, buf->rb_recv_bufs[i]); | |
1073 | if (buf->rb_send_bufs) | |
1074 | rpcrdma_destroy_req(ia, buf->rb_send_bufs[i]); | |
c56c65fb TT |
1075 | } |
1076 | ||
4561f347 | 1077 | ia->ri_ops->ro_destroy(buf); |
4034ba04 | 1078 | |
c56c65fb TT |
1079 | kfree(buf->rb_pool); |
1080 | } | |
1081 | ||
346aa66b CL |
1082 | struct rpcrdma_mw * |
1083 | rpcrdma_get_mw(struct rpcrdma_xprt *r_xprt) | |
c2922c02 | 1084 | { |
346aa66b CL |
1085 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; |
1086 | struct rpcrdma_mw *mw = NULL; | |
346aa66b | 1087 | |
58d1dcf5 | 1088 | spin_lock(&buf->rb_mwlock); |
346aa66b CL |
1089 | if (!list_empty(&buf->rb_mws)) { |
1090 | mw = list_first_entry(&buf->rb_mws, | |
1091 | struct rpcrdma_mw, mw_list); | |
1092 | list_del_init(&mw->mw_list); | |
c2922c02 | 1093 | } |
58d1dcf5 | 1094 | spin_unlock(&buf->rb_mwlock); |
346aa66b CL |
1095 | |
1096 | if (!mw) | |
1097 | pr_err("RPC: %s: no MWs available\n", __func__); | |
1098 | return mw; | |
c2922c02 CL |
1099 | } |
1100 | ||
346aa66b CL |
1101 | void |
1102 | rpcrdma_put_mw(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mw *mw) | |
c2922c02 | 1103 | { |
346aa66b | 1104 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; |
c2922c02 | 1105 | |
58d1dcf5 | 1106 | spin_lock(&buf->rb_mwlock); |
346aa66b | 1107 | list_add_tail(&mw->mw_list, &buf->rb_mws); |
58d1dcf5 | 1108 | spin_unlock(&buf->rb_mwlock); |
c2922c02 CL |
1109 | } |
1110 | ||
1111 | static void | |
1112 | rpcrdma_buffer_put_sendbuf(struct rpcrdma_req *req, struct rpcrdma_buffer *buf) | |
1113 | { | |
1114 | buf->rb_send_bufs[--buf->rb_send_index] = req; | |
1115 | req->rl_niovs = 0; | |
1116 | if (req->rl_reply) { | |
1117 | buf->rb_recv_bufs[--buf->rb_recv_index] = req->rl_reply; | |
c2922c02 CL |
1118 | req->rl_reply = NULL; |
1119 | } | |
1120 | } | |
1121 | ||
c56c65fb TT |
1122 | /* |
1123 | * Get a set of request/reply buffers. | |
1124 | * | |
1125 | * Reply buffer (if needed) is attached to send buffer upon return. | |
1126 | * Rule: | |
1127 | * rb_send_index and rb_recv_index MUST always be pointing to the | |
1128 | * *next* available buffer (non-NULL). They are incremented after | |
1129 | * removing buffers, and decremented *before* returning them. | |
1130 | */ | |
1131 | struct rpcrdma_req * | |
1132 | rpcrdma_buffer_get(struct rpcrdma_buffer *buffers) | |
1133 | { | |
1134 | struct rpcrdma_req *req; | |
1135 | unsigned long flags; | |
1136 | ||
1137 | spin_lock_irqsave(&buffers->rb_lock, flags); | |
c14d86e5 | 1138 | |
c56c65fb TT |
1139 | if (buffers->rb_send_index == buffers->rb_max_requests) { |
1140 | spin_unlock_irqrestore(&buffers->rb_lock, flags); | |
1141 | dprintk("RPC: %s: out of request buffers\n", __func__); | |
1142 | return ((struct rpcrdma_req *)NULL); | |
1143 | } | |
1144 | ||
1145 | req = buffers->rb_send_bufs[buffers->rb_send_index]; | |
1146 | if (buffers->rb_send_index < buffers->rb_recv_index) { | |
1147 | dprintk("RPC: %s: %d extra receives outstanding (ok)\n", | |
1148 | __func__, | |
1149 | buffers->rb_recv_index - buffers->rb_send_index); | |
1150 | req->rl_reply = NULL; | |
1151 | } else { | |
1152 | req->rl_reply = buffers->rb_recv_bufs[buffers->rb_recv_index]; | |
1153 | buffers->rb_recv_bufs[buffers->rb_recv_index++] = NULL; | |
1154 | } | |
1155 | buffers->rb_send_bufs[buffers->rb_send_index++] = NULL; | |
ddb6bebc | 1156 | |
c56c65fb TT |
1157 | spin_unlock_irqrestore(&buffers->rb_lock, flags); |
1158 | return req; | |
1159 | } | |
1160 | ||
1161 | /* | |
1162 | * Put request/reply buffers back into pool. | |
1163 | * Pre-decrement counter/array index. | |
1164 | */ | |
1165 | void | |
1166 | rpcrdma_buffer_put(struct rpcrdma_req *req) | |
1167 | { | |
1168 | struct rpcrdma_buffer *buffers = req->rl_buffer; | |
c56c65fb TT |
1169 | unsigned long flags; |
1170 | ||
c56c65fb | 1171 | spin_lock_irqsave(&buffers->rb_lock, flags); |
c2922c02 | 1172 | rpcrdma_buffer_put_sendbuf(req, buffers); |
c56c65fb TT |
1173 | spin_unlock_irqrestore(&buffers->rb_lock, flags); |
1174 | } | |
1175 | ||
1176 | /* | |
1177 | * Recover reply buffers from pool. | |
1178 | * This happens when recovering from error conditions. | |
1179 | * Post-increment counter/array index. | |
1180 | */ | |
1181 | void | |
1182 | rpcrdma_recv_buffer_get(struct rpcrdma_req *req) | |
1183 | { | |
1184 | struct rpcrdma_buffer *buffers = req->rl_buffer; | |
1185 | unsigned long flags; | |
1186 | ||
c56c65fb TT |
1187 | spin_lock_irqsave(&buffers->rb_lock, flags); |
1188 | if (buffers->rb_recv_index < buffers->rb_max_requests) { | |
1189 | req->rl_reply = buffers->rb_recv_bufs[buffers->rb_recv_index]; | |
1190 | buffers->rb_recv_bufs[buffers->rb_recv_index++] = NULL; | |
1191 | } | |
1192 | spin_unlock_irqrestore(&buffers->rb_lock, flags); | |
1193 | } | |
1194 | ||
1195 | /* | |
1196 | * Put reply buffers back into pool when not attached to | |
b45ccfd2 | 1197 | * request. This happens in error conditions. |
c56c65fb TT |
1198 | */ |
1199 | void | |
1200 | rpcrdma_recv_buffer_put(struct rpcrdma_rep *rep) | |
1201 | { | |
fed171b3 | 1202 | struct rpcrdma_buffer *buffers = &rep->rr_rxprt->rx_buf; |
c56c65fb TT |
1203 | unsigned long flags; |
1204 | ||
c56c65fb TT |
1205 | spin_lock_irqsave(&buffers->rb_lock, flags); |
1206 | buffers->rb_recv_bufs[--buffers->rb_recv_index] = rep; | |
1207 | spin_unlock_irqrestore(&buffers->rb_lock, flags); | |
1208 | } | |
1209 | ||
1210 | /* | |
1211 | * Wrappers for internal-use kmalloc memory registration, used by buffer code. | |
1212 | */ | |
1213 | ||
d654788e CL |
1214 | void |
1215 | rpcrdma_mapping_error(struct rpcrdma_mr_seg *seg) | |
1216 | { | |
1217 | dprintk("RPC: map_one: offset %p iova %llx len %zu\n", | |
1218 | seg->mr_offset, | |
1219 | (unsigned long long)seg->mr_dma, seg->mr_dmalen); | |
1220 | } | |
1221 | ||
9128c3e7 CL |
1222 | /** |
1223 | * rpcrdma_alloc_regbuf - kmalloc and register memory for SEND/RECV buffers | |
1224 | * @ia: controlling rpcrdma_ia | |
1225 | * @size: size of buffer to be allocated, in bytes | |
1226 | * @flags: GFP flags | |
1227 | * | |
1228 | * Returns pointer to private header of an area of internally | |
1229 | * registered memory, or an ERR_PTR. The registered buffer follows | |
1230 | * the end of the private header. | |
1231 | * | |
1232 | * xprtrdma uses a regbuf for posting an outgoing RDMA SEND, or for | |
1233 | * receiving the payload of RDMA RECV operations. regbufs are not | |
1234 | * used for RDMA READ/WRITE operations, thus are registered only for | |
1235 | * LOCAL access. | |
1236 | */ | |
1237 | struct rpcrdma_regbuf * | |
1238 | rpcrdma_alloc_regbuf(struct rpcrdma_ia *ia, size_t size, gfp_t flags) | |
1239 | { | |
1240 | struct rpcrdma_regbuf *rb; | |
e531dcab | 1241 | struct ib_sge *iov; |
9128c3e7 | 1242 | |
9128c3e7 CL |
1243 | rb = kmalloc(sizeof(*rb) + size, flags); |
1244 | if (rb == NULL) | |
1245 | goto out; | |
1246 | ||
e531dcab CL |
1247 | iov = &rb->rg_iov; |
1248 | iov->addr = ib_dma_map_single(ia->ri_device, | |
1249 | (void *)rb->rg_base, size, | |
1250 | DMA_BIDIRECTIONAL); | |
1251 | if (ib_dma_mapping_error(ia->ri_device, iov->addr)) | |
9128c3e7 CL |
1252 | goto out_free; |
1253 | ||
e531dcab | 1254 | iov->length = size; |
d1ed857e | 1255 | iov->lkey = ia->ri_dma_lkey; |
e531dcab CL |
1256 | rb->rg_size = size; |
1257 | rb->rg_owner = NULL; | |
9128c3e7 CL |
1258 | return rb; |
1259 | ||
1260 | out_free: | |
1261 | kfree(rb); | |
1262 | out: | |
e531dcab | 1263 | return ERR_PTR(-ENOMEM); |
9128c3e7 CL |
1264 | } |
1265 | ||
1266 | /** | |
1267 | * rpcrdma_free_regbuf - deregister and free registered buffer | |
1268 | * @ia: controlling rpcrdma_ia | |
1269 | * @rb: regbuf to be deregistered and freed | |
1270 | */ | |
1271 | void | |
1272 | rpcrdma_free_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb) | |
1273 | { | |
e531dcab CL |
1274 | struct ib_sge *iov; |
1275 | ||
1276 | if (!rb) | |
1277 | return; | |
1278 | ||
1279 | iov = &rb->rg_iov; | |
1280 | ib_dma_unmap_single(ia->ri_device, | |
1281 | iov->addr, iov->length, DMA_BIDIRECTIONAL); | |
1282 | kfree(rb); | |
9128c3e7 CL |
1283 | } |
1284 | ||
c56c65fb TT |
1285 | /* |
1286 | * Prepost any receive buffer, then post send. | |
1287 | * | |
1288 | * Receive buffer is donated to hardware, reclaimed upon recv completion. | |
1289 | */ | |
1290 | int | |
1291 | rpcrdma_ep_post(struct rpcrdma_ia *ia, | |
1292 | struct rpcrdma_ep *ep, | |
1293 | struct rpcrdma_req *req) | |
1294 | { | |
b3221d6a | 1295 | struct ib_device *device = ia->ri_device; |
c56c65fb TT |
1296 | struct ib_send_wr send_wr, *send_wr_fail; |
1297 | struct rpcrdma_rep *rep = req->rl_reply; | |
b3221d6a CL |
1298 | struct ib_sge *iov = req->rl_send_iov; |
1299 | int i, rc; | |
c56c65fb TT |
1300 | |
1301 | if (rep) { | |
1302 | rc = rpcrdma_ep_post_recv(ia, ep, rep); | |
1303 | if (rc) | |
1304 | goto out; | |
1305 | req->rl_reply = NULL; | |
1306 | } | |
1307 | ||
1308 | send_wr.next = NULL; | |
e46ac34c | 1309 | send_wr.wr_id = RPCRDMA_IGNORE_COMPLETION; |
b3221d6a | 1310 | send_wr.sg_list = iov; |
c56c65fb TT |
1311 | send_wr.num_sge = req->rl_niovs; |
1312 | send_wr.opcode = IB_WR_SEND; | |
b3221d6a CL |
1313 | |
1314 | for (i = 0; i < send_wr.num_sge; i++) | |
1315 | ib_dma_sync_single_for_device(device, iov[i].addr, | |
1316 | iov[i].length, DMA_TO_DEVICE); | |
1317 | dprintk("RPC: %s: posting %d s/g entries\n", | |
1318 | __func__, send_wr.num_sge); | |
c56c65fb TT |
1319 | |
1320 | if (DECR_CQCOUNT(ep) > 0) | |
1321 | send_wr.send_flags = 0; | |
1322 | else { /* Provider must take a send completion every now and then */ | |
1323 | INIT_CQCOUNT(ep); | |
1324 | send_wr.send_flags = IB_SEND_SIGNALED; | |
1325 | } | |
1326 | ||
1327 | rc = ib_post_send(ia->ri_id->qp, &send_wr, &send_wr_fail); | |
1328 | if (rc) | |
1329 | dprintk("RPC: %s: ib_post_send returned %i\n", __func__, | |
1330 | rc); | |
1331 | out: | |
1332 | return rc; | |
1333 | } | |
1334 | ||
1335 | /* | |
1336 | * (Re)post a receive buffer. | |
1337 | */ | |
1338 | int | |
1339 | rpcrdma_ep_post_recv(struct rpcrdma_ia *ia, | |
1340 | struct rpcrdma_ep *ep, | |
1341 | struct rpcrdma_rep *rep) | |
1342 | { | |
1343 | struct ib_recv_wr recv_wr, *recv_wr_fail; | |
1344 | int rc; | |
1345 | ||
1346 | recv_wr.next = NULL; | |
1347 | recv_wr.wr_id = (u64) (unsigned long) rep; | |
6b1184cd | 1348 | recv_wr.sg_list = &rep->rr_rdmabuf->rg_iov; |
c56c65fb TT |
1349 | recv_wr.num_sge = 1; |
1350 | ||
89e0d112 | 1351 | ib_dma_sync_single_for_cpu(ia->ri_device, |
6b1184cd CL |
1352 | rdmab_addr(rep->rr_rdmabuf), |
1353 | rdmab_length(rep->rr_rdmabuf), | |
1354 | DMA_BIDIRECTIONAL); | |
c56c65fb | 1355 | |
c56c65fb TT |
1356 | rc = ib_post_recv(ia->ri_id->qp, &recv_wr, &recv_wr_fail); |
1357 | ||
1358 | if (rc) | |
1359 | dprintk("RPC: %s: ib_post_recv returned %i\n", __func__, | |
1360 | rc); | |
1361 | return rc; | |
1362 | } | |
43e95988 | 1363 | |
1c9351ee | 1364 | /* How many chunk list items fit within our inline buffers? |
43e95988 | 1365 | */ |
1c9351ee CL |
1366 | unsigned int |
1367 | rpcrdma_max_segments(struct rpcrdma_xprt *r_xprt) | |
43e95988 CL |
1368 | { |
1369 | struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data; | |
1c9351ee | 1370 | int bytes, segments; |
43e95988 | 1371 | |
1c9351ee CL |
1372 | bytes = min_t(unsigned int, cdata->inline_wsize, cdata->inline_rsize); |
1373 | bytes -= RPCRDMA_HDRLEN_MIN; | |
1374 | if (bytes < sizeof(struct rpcrdma_segment) * 2) { | |
1375 | pr_warn("RPC: %s: inline threshold too small\n", | |
1376 | __func__); | |
1377 | return 0; | |
43e95988 | 1378 | } |
1c9351ee CL |
1379 | |
1380 | segments = 1 << (fls(bytes / sizeof(struct rpcrdma_segment)) - 1); | |
1381 | dprintk("RPC: %s: max chunk list size = %d segments\n", | |
1382 | __func__, segments); | |
1383 | return segments; | |
43e95988 | 1384 | } |