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f58851e6 | 1 | /* |
c56c65fb TT |
2 | * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved. |
3 | * | |
4 | * This software is available to you under a choice of one of two | |
5 | * licenses. You may choose to be licensed under the terms of the GNU | |
6 | * General Public License (GPL) Version 2, available from the file | |
7 | * COPYING in the main directory of this source tree, or the BSD-type | |
8 | * license below: | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or without | |
11 | * modification, are permitted provided that the following conditions | |
12 | * are met: | |
13 | * | |
14 | * Redistributions of source code must retain the above copyright | |
15 | * notice, this list of conditions and the following disclaimer. | |
16 | * | |
17 | * Redistributions in binary form must reproduce the above | |
18 | * copyright notice, this list of conditions and the following | |
19 | * disclaimer in the documentation and/or other materials provided | |
20 | * with the distribution. | |
21 | * | |
22 | * Neither the name of the Network Appliance, Inc. nor the names of | |
23 | * its contributors may be used to endorse or promote products | |
24 | * derived from this software without specific prior written | |
25 | * permission. | |
26 | * | |
27 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
28 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
29 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
30 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
31 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
32 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
33 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
34 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
35 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
36 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
37 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
f58851e6 TT |
38 | */ |
39 | ||
c56c65fb TT |
40 | /* |
41 | * verbs.c | |
42 | * | |
43 | * Encapsulates the major functions managing: | |
44 | * o adapters | |
45 | * o endpoints | |
46 | * o connections | |
47 | * o buffer memory | |
48 | */ | |
49 | ||
a6b7a407 | 50 | #include <linux/interrupt.h> |
5a0e3ad6 | 51 | #include <linux/slab.h> |
eba8ff66 | 52 | #include <linux/prefetch.h> |
0dd39cae | 53 | #include <linux/sunrpc/addr.h> |
65866f82 | 54 | #include <asm/bitops.h> |
c56c65fb | 55 | |
f58851e6 TT |
56 | #include "xprt_rdma.h" |
57 | ||
c56c65fb TT |
58 | /* |
59 | * Globals/Macros | |
60 | */ | |
61 | ||
f895b252 | 62 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
c56c65fb TT |
63 | # define RPCDBG_FACILITY RPCDBG_TRANS |
64 | #endif | |
65 | ||
66 | /* | |
67 | * internal functions | |
68 | */ | |
69 | ||
70 | /* | |
71 | * handle replies in tasklet context, using a single, global list | |
72 | * rdma tasklet function -- just turn around and call the func | |
73 | * for all replies on the list | |
74 | */ | |
75 | ||
76 | static DEFINE_SPINLOCK(rpcrdma_tk_lock_g); | |
77 | static LIST_HEAD(rpcrdma_tasklets_g); | |
78 | ||
79 | static void | |
80 | rpcrdma_run_tasklet(unsigned long data) | |
81 | { | |
82 | struct rpcrdma_rep *rep; | |
83 | void (*func)(struct rpcrdma_rep *); | |
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); | |
92 | func = rep->rr_func; | |
93 | rep->rr_func = NULL; | |
94 | spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags); | |
95 | ||
96 | if (func) | |
97 | func(rep); | |
98 | else | |
99 | rpcrdma_recv_buffer_put(rep); | |
100 | ||
101 | spin_lock_irqsave(&rpcrdma_tk_lock_g, flags); | |
102 | } | |
103 | spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags); | |
104 | } | |
105 | ||
106 | static DECLARE_TASKLET(rpcrdma_tasklet_g, rpcrdma_run_tasklet, 0UL); | |
107 | ||
f1a03b76 CL |
108 | static void |
109 | rpcrdma_schedule_tasklet(struct list_head *sched_list) | |
110 | { | |
111 | unsigned long flags; | |
112 | ||
113 | spin_lock_irqsave(&rpcrdma_tk_lock_g, flags); | |
114 | list_splice_tail(sched_list, &rpcrdma_tasklets_g); | |
115 | spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags); | |
116 | tasklet_schedule(&rpcrdma_tasklet_g); | |
117 | } | |
118 | ||
c56c65fb TT |
119 | static void |
120 | rpcrdma_qp_async_error_upcall(struct ib_event *event, void *context) | |
121 | { | |
122 | struct rpcrdma_ep *ep = context; | |
123 | ||
7ff11de1 | 124 | pr_err("RPC: %s: %s on device %s ep %p\n", |
76357c71 | 125 | __func__, ib_event_msg(event->event), |
7ff11de1 | 126 | event->device->name, context); |
c56c65fb TT |
127 | if (ep->rep_connected == 1) { |
128 | ep->rep_connected = -EIO; | |
afadc468 | 129 | rpcrdma_conn_func(ep); |
c56c65fb TT |
130 | wake_up_all(&ep->rep_connect_wait); |
131 | } | |
132 | } | |
133 | ||
134 | static void | |
135 | rpcrdma_cq_async_error_upcall(struct ib_event *event, void *context) | |
136 | { | |
137 | struct rpcrdma_ep *ep = context; | |
138 | ||
7ff11de1 | 139 | pr_err("RPC: %s: %s on device %s ep %p\n", |
76357c71 | 140 | __func__, ib_event_msg(event->event), |
7ff11de1 | 141 | event->device->name, context); |
c56c65fb TT |
142 | if (ep->rep_connected == 1) { |
143 | ep->rep_connected = -EIO; | |
afadc468 | 144 | rpcrdma_conn_func(ep); |
c56c65fb TT |
145 | wake_up_all(&ep->rep_connect_wait); |
146 | } | |
147 | } | |
148 | ||
fc664485 CL |
149 | static void |
150 | rpcrdma_sendcq_process_wc(struct ib_wc *wc) | |
c56c65fb | 151 | { |
8502427c | 152 | /* WARNING: Only wr_id and status are reliable at this point */ |
e46ac34c CL |
153 | if (wc->wr_id == RPCRDMA_IGNORE_COMPLETION) { |
154 | if (wc->status != IB_WC_SUCCESS && | |
155 | wc->status != IB_WC_WR_FLUSH_ERR) | |
8502427c | 156 | pr_err("RPC: %s: SEND: %s\n", |
76357c71 | 157 | __func__, ib_wc_status_msg(wc->status)); |
8502427c CL |
158 | } else { |
159 | struct rpcrdma_mw *r; | |
160 | ||
161 | r = (struct rpcrdma_mw *)(unsigned long)wc->wr_id; | |
e46ac34c | 162 | r->mw_sendcompletion(wc); |
8502427c | 163 | } |
c56c65fb TT |
164 | } |
165 | ||
fc664485 | 166 | static int |
1c00dd07 | 167 | rpcrdma_sendcq_poll(struct ib_cq *cq, struct rpcrdma_ep *ep) |
c56c65fb | 168 | { |
1c00dd07 | 169 | struct ib_wc *wcs; |
8301a2c0 | 170 | int budget, count, rc; |
c56c65fb | 171 | |
8301a2c0 | 172 | budget = RPCRDMA_WC_BUDGET / RPCRDMA_POLLSIZE; |
1c00dd07 CL |
173 | do { |
174 | wcs = ep->rep_send_wcs; | |
175 | ||
176 | rc = ib_poll_cq(cq, RPCRDMA_POLLSIZE, wcs); | |
177 | if (rc <= 0) | |
178 | return rc; | |
179 | ||
180 | count = rc; | |
181 | while (count-- > 0) | |
182 | rpcrdma_sendcq_process_wc(wcs++); | |
8301a2c0 | 183 | } while (rc == RPCRDMA_POLLSIZE && --budget); |
1c00dd07 | 184 | return 0; |
fc664485 | 185 | } |
c56c65fb | 186 | |
fc664485 CL |
187 | /* |
188 | * Handle send, fast_reg_mr, and local_inv completions. | |
189 | * | |
190 | * Send events are typically suppressed and thus do not result | |
191 | * in an upcall. Occasionally one is signaled, however. This | |
192 | * prevents the provider's completion queue from wrapping and | |
193 | * losing a completion. | |
194 | */ | |
195 | static void | |
196 | rpcrdma_sendcq_upcall(struct ib_cq *cq, void *cq_context) | |
197 | { | |
1c00dd07 | 198 | struct rpcrdma_ep *ep = (struct rpcrdma_ep *)cq_context; |
fc664485 CL |
199 | int rc; |
200 | ||
1c00dd07 | 201 | rc = rpcrdma_sendcq_poll(cq, ep); |
fc664485 CL |
202 | if (rc) { |
203 | dprintk("RPC: %s: ib_poll_cq failed: %i\n", | |
204 | __func__, rc); | |
205 | return; | |
c56c65fb TT |
206 | } |
207 | ||
7f23f6f6 CL |
208 | rc = ib_req_notify_cq(cq, |
209 | IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS); | |
210 | if (rc == 0) | |
211 | return; | |
212 | if (rc < 0) { | |
fc664485 CL |
213 | dprintk("RPC: %s: ib_req_notify_cq failed: %i\n", |
214 | __func__, rc); | |
215 | return; | |
216 | } | |
217 | ||
1c00dd07 | 218 | rpcrdma_sendcq_poll(cq, ep); |
fc664485 CL |
219 | } |
220 | ||
221 | static void | |
bb96193d | 222 | rpcrdma_recvcq_process_wc(struct ib_wc *wc, struct list_head *sched_list) |
fc664485 CL |
223 | { |
224 | struct rpcrdma_rep *rep = | |
225 | (struct rpcrdma_rep *)(unsigned long)wc->wr_id; | |
226 | ||
8502427c CL |
227 | /* WARNING: Only wr_id and status are reliable at this point */ |
228 | if (wc->status != IB_WC_SUCCESS) | |
229 | goto out_fail; | |
fc664485 | 230 | |
8502427c | 231 | /* status == SUCCESS means all fields in wc are trustworthy */ |
fc664485 CL |
232 | if (wc->opcode != IB_WC_RECV) |
233 | return; | |
234 | ||
8502427c CL |
235 | dprintk("RPC: %s: rep %p opcode 'recv', length %u: success\n", |
236 | __func__, rep, wc->byte_len); | |
237 | ||
fc664485 CL |
238 | rep->rr_len = wc->byte_len; |
239 | ib_dma_sync_single_for_cpu(rdmab_to_ia(rep->rr_buffer)->ri_id->device, | |
6b1184cd CL |
240 | rdmab_addr(rep->rr_rdmabuf), |
241 | rep->rr_len, DMA_FROM_DEVICE); | |
242 | prefetch(rdmab_to_msg(rep->rr_rdmabuf)); | |
fc664485 CL |
243 | |
244 | out_schedule: | |
bb96193d | 245 | list_add_tail(&rep->rr_list, sched_list); |
8502427c CL |
246 | return; |
247 | out_fail: | |
248 | if (wc->status != IB_WC_WR_FLUSH_ERR) | |
249 | pr_err("RPC: %s: rep %p: %s\n", | |
76357c71 | 250 | __func__, rep, ib_wc_status_msg(wc->status)); |
8502427c CL |
251 | rep->rr_len = ~0U; |
252 | goto out_schedule; | |
fc664485 CL |
253 | } |
254 | ||
255 | static int | |
1c00dd07 | 256 | rpcrdma_recvcq_poll(struct ib_cq *cq, struct rpcrdma_ep *ep) |
fc664485 | 257 | { |
bb96193d | 258 | struct list_head sched_list; |
1c00dd07 | 259 | struct ib_wc *wcs; |
8301a2c0 | 260 | int budget, count, rc; |
fc664485 | 261 | |
bb96193d | 262 | INIT_LIST_HEAD(&sched_list); |
8301a2c0 | 263 | budget = RPCRDMA_WC_BUDGET / RPCRDMA_POLLSIZE; |
1c00dd07 CL |
264 | do { |
265 | wcs = ep->rep_recv_wcs; | |
266 | ||
267 | rc = ib_poll_cq(cq, RPCRDMA_POLLSIZE, wcs); | |
268 | if (rc <= 0) | |
bb96193d | 269 | goto out_schedule; |
1c00dd07 CL |
270 | |
271 | count = rc; | |
272 | while (count-- > 0) | |
bb96193d | 273 | rpcrdma_recvcq_process_wc(wcs++, &sched_list); |
8301a2c0 | 274 | } while (rc == RPCRDMA_POLLSIZE && --budget); |
bb96193d CL |
275 | rc = 0; |
276 | ||
277 | out_schedule: | |
f1a03b76 | 278 | rpcrdma_schedule_tasklet(&sched_list); |
bb96193d | 279 | return rc; |
c56c65fb TT |
280 | } |
281 | ||
282 | /* | |
fc664485 | 283 | * Handle receive completions. |
c56c65fb | 284 | * |
c56c65fb TT |
285 | * It is reentrant but processes single events in order to maintain |
286 | * ordering of receives to keep server credits. | |
287 | * | |
288 | * It is the responsibility of the scheduled tasklet to return | |
289 | * recv buffers to the pool. NOTE: this affects synchronization of | |
290 | * connection shutdown. That is, the structures required for | |
291 | * the completion of the reply handler must remain intact until | |
292 | * all memory has been reclaimed. | |
c56c65fb TT |
293 | */ |
294 | static void | |
fc664485 | 295 | rpcrdma_recvcq_upcall(struct ib_cq *cq, void *cq_context) |
c56c65fb | 296 | { |
1c00dd07 | 297 | struct rpcrdma_ep *ep = (struct rpcrdma_ep *)cq_context; |
c56c65fb TT |
298 | int rc; |
299 | ||
1c00dd07 | 300 | rc = rpcrdma_recvcq_poll(cq, ep); |
fc664485 CL |
301 | if (rc) { |
302 | dprintk("RPC: %s: ib_poll_cq failed: %i\n", | |
303 | __func__, rc); | |
c56c65fb | 304 | return; |
fc664485 | 305 | } |
c56c65fb | 306 | |
7f23f6f6 CL |
307 | rc = ib_req_notify_cq(cq, |
308 | IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS); | |
309 | if (rc == 0) | |
310 | return; | |
311 | if (rc < 0) { | |
fc664485 | 312 | dprintk("RPC: %s: ib_req_notify_cq failed: %i\n", |
c56c65fb TT |
313 | __func__, rc); |
314 | return; | |
315 | } | |
316 | ||
1c00dd07 | 317 | rpcrdma_recvcq_poll(cq, ep); |
c56c65fb TT |
318 | } |
319 | ||
a7bc211a CL |
320 | static void |
321 | rpcrdma_flush_cqs(struct rpcrdma_ep *ep) | |
322 | { | |
5c166bef CL |
323 | struct ib_wc wc; |
324 | LIST_HEAD(sched_list); | |
325 | ||
326 | while (ib_poll_cq(ep->rep_attr.recv_cq, 1, &wc) > 0) | |
327 | rpcrdma_recvcq_process_wc(&wc, &sched_list); | |
328 | if (!list_empty(&sched_list)) | |
329 | rpcrdma_schedule_tasklet(&sched_list); | |
330 | while (ib_poll_cq(ep->rep_attr.send_cq, 1, &wc) > 0) | |
331 | rpcrdma_sendcq_process_wc(&wc); | |
a7bc211a CL |
332 | } |
333 | ||
c56c65fb TT |
334 | static int |
335 | rpcrdma_conn_upcall(struct rdma_cm_id *id, struct rdma_cm_event *event) | |
336 | { | |
337 | struct rpcrdma_xprt *xprt = id->context; | |
338 | struct rpcrdma_ia *ia = &xprt->rx_ia; | |
339 | struct rpcrdma_ep *ep = &xprt->rx_ep; | |
f895b252 | 340 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
0dd39cae | 341 | struct sockaddr *sap = (struct sockaddr *)&ep->rep_remote_addr; |
ff0db049 | 342 | #endif |
ce1ab9ab CL |
343 | struct ib_qp_attr *attr = &ia->ri_qp_attr; |
344 | struct ib_qp_init_attr *iattr = &ia->ri_qp_init_attr; | |
c56c65fb TT |
345 | int connstate = 0; |
346 | ||
347 | switch (event->event) { | |
348 | case RDMA_CM_EVENT_ADDR_RESOLVED: | |
349 | case RDMA_CM_EVENT_ROUTE_RESOLVED: | |
5675add3 | 350 | ia->ri_async_rc = 0; |
c56c65fb TT |
351 | complete(&ia->ri_done); |
352 | break; | |
353 | case RDMA_CM_EVENT_ADDR_ERROR: | |
354 | ia->ri_async_rc = -EHOSTUNREACH; | |
355 | dprintk("RPC: %s: CM address resolution error, ep 0x%p\n", | |
356 | __func__, ep); | |
357 | complete(&ia->ri_done); | |
358 | break; | |
359 | case RDMA_CM_EVENT_ROUTE_ERROR: | |
360 | ia->ri_async_rc = -ENETUNREACH; | |
361 | dprintk("RPC: %s: CM route resolution error, ep 0x%p\n", | |
362 | __func__, ep); | |
363 | complete(&ia->ri_done); | |
364 | break; | |
365 | case RDMA_CM_EVENT_ESTABLISHED: | |
366 | connstate = 1; | |
ce1ab9ab CL |
367 | ib_query_qp(ia->ri_id->qp, attr, |
368 | IB_QP_MAX_QP_RD_ATOMIC | IB_QP_MAX_DEST_RD_ATOMIC, | |
369 | iattr); | |
c56c65fb TT |
370 | dprintk("RPC: %s: %d responder resources" |
371 | " (%d initiator)\n", | |
ce1ab9ab CL |
372 | __func__, attr->max_dest_rd_atomic, |
373 | attr->max_rd_atomic); | |
c56c65fb TT |
374 | goto connected; |
375 | case RDMA_CM_EVENT_CONNECT_ERROR: | |
376 | connstate = -ENOTCONN; | |
377 | goto connected; | |
378 | case RDMA_CM_EVENT_UNREACHABLE: | |
379 | connstate = -ENETDOWN; | |
380 | goto connected; | |
381 | case RDMA_CM_EVENT_REJECTED: | |
382 | connstate = -ECONNREFUSED; | |
383 | goto connected; | |
384 | case RDMA_CM_EVENT_DISCONNECTED: | |
385 | connstate = -ECONNABORTED; | |
386 | goto connected; | |
387 | case RDMA_CM_EVENT_DEVICE_REMOVAL: | |
388 | connstate = -ENODEV; | |
389 | connected: | |
c56c65fb TT |
390 | dprintk("RPC: %s: %sconnected\n", |
391 | __func__, connstate > 0 ? "" : "dis"); | |
392 | ep->rep_connected = connstate; | |
afadc468 | 393 | rpcrdma_conn_func(ep); |
c56c65fb | 394 | wake_up_all(&ep->rep_connect_wait); |
8079fb78 | 395 | /*FALLTHROUGH*/ |
c56c65fb | 396 | default: |
0dd39cae CL |
397 | dprintk("RPC: %s: %pIS:%u (ep 0x%p): %s\n", |
398 | __func__, sap, rpc_get_port(sap), ep, | |
76357c71 | 399 | rdma_event_msg(event->event)); |
c56c65fb TT |
400 | break; |
401 | } | |
402 | ||
f895b252 | 403 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
b3cd8d45 | 404 | if (connstate == 1) { |
ce1ab9ab | 405 | int ird = attr->max_dest_rd_atomic; |
b3cd8d45 | 406 | int tird = ep->rep_remote_cma.responder_resources; |
0dd39cae | 407 | |
a0ce85f5 | 408 | pr_info("rpcrdma: connection to %pIS:%u on %s, memreg '%s', %d credits, %d responders%s\n", |
0dd39cae | 409 | sap, rpc_get_port(sap), |
b3cd8d45 | 410 | ia->ri_id->device->name, |
a0ce85f5 | 411 | ia->ri_ops->ro_displayname, |
b3cd8d45 TT |
412 | xprt->rx_buf.rb_max_requests, |
413 | ird, ird < 4 && ird < tird / 2 ? " (low!)" : ""); | |
414 | } else if (connstate < 0) { | |
0dd39cae CL |
415 | pr_info("rpcrdma: connection to %pIS:%u closed (%d)\n", |
416 | sap, rpc_get_port(sap), connstate); | |
b3cd8d45 TT |
417 | } |
418 | #endif | |
419 | ||
c56c65fb TT |
420 | return 0; |
421 | } | |
422 | ||
423 | static struct rdma_cm_id * | |
424 | rpcrdma_create_id(struct rpcrdma_xprt *xprt, | |
425 | struct rpcrdma_ia *ia, struct sockaddr *addr) | |
426 | { | |
427 | struct rdma_cm_id *id; | |
428 | int rc; | |
429 | ||
1a954051 TT |
430 | init_completion(&ia->ri_done); |
431 | ||
b26f9b99 | 432 | id = rdma_create_id(rpcrdma_conn_upcall, xprt, RDMA_PS_TCP, IB_QPT_RC); |
c56c65fb TT |
433 | if (IS_ERR(id)) { |
434 | rc = PTR_ERR(id); | |
435 | dprintk("RPC: %s: rdma_create_id() failed %i\n", | |
436 | __func__, rc); | |
437 | return id; | |
438 | } | |
439 | ||
5675add3 | 440 | ia->ri_async_rc = -ETIMEDOUT; |
c56c65fb TT |
441 | rc = rdma_resolve_addr(id, NULL, addr, RDMA_RESOLVE_TIMEOUT); |
442 | if (rc) { | |
443 | dprintk("RPC: %s: rdma_resolve_addr() failed %i\n", | |
444 | __func__, rc); | |
445 | goto out; | |
446 | } | |
5675add3 TT |
447 | wait_for_completion_interruptible_timeout(&ia->ri_done, |
448 | msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1); | |
c56c65fb TT |
449 | rc = ia->ri_async_rc; |
450 | if (rc) | |
451 | goto out; | |
452 | ||
5675add3 | 453 | ia->ri_async_rc = -ETIMEDOUT; |
c56c65fb TT |
454 | rc = rdma_resolve_route(id, RDMA_RESOLVE_TIMEOUT); |
455 | if (rc) { | |
456 | dprintk("RPC: %s: rdma_resolve_route() failed %i\n", | |
457 | __func__, rc); | |
458 | goto out; | |
459 | } | |
5675add3 TT |
460 | wait_for_completion_interruptible_timeout(&ia->ri_done, |
461 | msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1); | |
c56c65fb TT |
462 | rc = ia->ri_async_rc; |
463 | if (rc) | |
464 | goto out; | |
465 | ||
466 | return id; | |
467 | ||
468 | out: | |
469 | rdma_destroy_id(id); | |
470 | return ERR_PTR(rc); | |
471 | } | |
472 | ||
473 | /* | |
474 | * Drain any cq, prior to teardown. | |
475 | */ | |
476 | static void | |
477 | rpcrdma_clean_cq(struct ib_cq *cq) | |
478 | { | |
479 | struct ib_wc wc; | |
480 | int count = 0; | |
481 | ||
482 | while (1 == ib_poll_cq(cq, 1, &wc)) | |
483 | ++count; | |
484 | ||
485 | if (count) | |
486 | dprintk("RPC: %s: flushed %d events (last 0x%x)\n", | |
487 | __func__, count, wc.opcode); | |
488 | } | |
489 | ||
490 | /* | |
491 | * Exported functions. | |
492 | */ | |
493 | ||
494 | /* | |
495 | * Open and initialize an Interface Adapter. | |
496 | * o initializes fields of struct rpcrdma_ia, including | |
497 | * interface and provider attributes and protection zone. | |
498 | */ | |
499 | int | |
500 | rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg) | |
501 | { | |
bd7ed1d1 | 502 | int rc, mem_priv; |
c56c65fb | 503 | struct rpcrdma_ia *ia = &xprt->rx_ia; |
7bc7972c | 504 | struct ib_device_attr *devattr = &ia->ri_devattr; |
c56c65fb | 505 | |
c56c65fb TT |
506 | ia->ri_id = rpcrdma_create_id(xprt, ia, addr); |
507 | if (IS_ERR(ia->ri_id)) { | |
508 | rc = PTR_ERR(ia->ri_id); | |
509 | goto out1; | |
510 | } | |
511 | ||
512 | ia->ri_pd = ib_alloc_pd(ia->ri_id->device); | |
513 | if (IS_ERR(ia->ri_pd)) { | |
514 | rc = PTR_ERR(ia->ri_pd); | |
515 | dprintk("RPC: %s: ib_alloc_pd() failed %i\n", | |
516 | __func__, rc); | |
517 | goto out2; | |
518 | } | |
519 | ||
7bc7972c | 520 | rc = ib_query_device(ia->ri_id->device, devattr); |
bd7ed1d1 TT |
521 | if (rc) { |
522 | dprintk("RPC: %s: ib_query_device failed %d\n", | |
523 | __func__, rc); | |
5ae711a2 | 524 | goto out3; |
bd7ed1d1 TT |
525 | } |
526 | ||
7bc7972c | 527 | if (devattr->device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY) { |
bd7ed1d1 TT |
528 | ia->ri_have_dma_lkey = 1; |
529 | ia->ri_dma_lkey = ia->ri_id->device->local_dma_lkey; | |
530 | } | |
531 | ||
f10eafd3 | 532 | if (memreg == RPCRDMA_FRMR) { |
3197d309 | 533 | /* Requires both frmr reg and local dma lkey */ |
41f97028 | 534 | if (((devattr->device_cap_flags & |
3197d309 | 535 | (IB_DEVICE_MEM_MGT_EXTENSIONS|IB_DEVICE_LOCAL_DMA_LKEY)) != |
41f97028 CL |
536 | (IB_DEVICE_MEM_MGT_EXTENSIONS|IB_DEVICE_LOCAL_DMA_LKEY)) || |
537 | (devattr->max_fast_reg_page_list_len == 0)) { | |
3197d309 | 538 | dprintk("RPC: %s: FRMR registration " |
f10eafd3 CL |
539 | "not supported by HCA\n", __func__); |
540 | memreg = RPCRDMA_MTHCAFMR; | |
bd7ed1d1 | 541 | } |
f10eafd3 CL |
542 | } |
543 | if (memreg == RPCRDMA_MTHCAFMR) { | |
544 | if (!ia->ri_id->device->alloc_fmr) { | |
545 | dprintk("RPC: %s: MTHCAFMR registration " | |
546 | "not supported by HCA\n", __func__); | |
f10eafd3 | 547 | memreg = RPCRDMA_ALLPHYSICAL; |
f10eafd3 | 548 | } |
bd7ed1d1 TT |
549 | } |
550 | ||
c56c65fb TT |
551 | /* |
552 | * Optionally obtain an underlying physical identity mapping in | |
553 | * order to do a memory window-based bind. This base registration | |
554 | * is protected from remote access - that is enabled only by binding | |
555 | * for the specific bytes targeted during each RPC operation, and | |
556 | * revoked after the corresponding completion similar to a storage | |
557 | * adapter. | |
558 | */ | |
bd7ed1d1 | 559 | switch (memreg) { |
3197d309 | 560 | case RPCRDMA_FRMR: |
a0ce85f5 | 561 | ia->ri_ops = &rpcrdma_frwr_memreg_ops; |
bd7ed1d1 | 562 | break; |
bd7ed1d1 | 563 | case RPCRDMA_ALLPHYSICAL: |
a0ce85f5 | 564 | ia->ri_ops = &rpcrdma_physical_memreg_ops; |
bd7ed1d1 TT |
565 | mem_priv = IB_ACCESS_LOCAL_WRITE | |
566 | IB_ACCESS_REMOTE_WRITE | | |
567 | IB_ACCESS_REMOTE_READ; | |
568 | goto register_setup; | |
bd7ed1d1 | 569 | case RPCRDMA_MTHCAFMR: |
a0ce85f5 | 570 | ia->ri_ops = &rpcrdma_fmr_memreg_ops; |
bd7ed1d1 | 571 | if (ia->ri_have_dma_lkey) |
c56c65fb | 572 | break; |
bd7ed1d1 TT |
573 | mem_priv = IB_ACCESS_LOCAL_WRITE; |
574 | register_setup: | |
c56c65fb TT |
575 | ia->ri_bind_mem = ib_get_dma_mr(ia->ri_pd, mem_priv); |
576 | if (IS_ERR(ia->ri_bind_mem)) { | |
577 | printk(KERN_ALERT "%s: ib_get_dma_mr for " | |
0ac531c1 | 578 | "phys register failed with %lX\n", |
c56c65fb | 579 | __func__, PTR_ERR(ia->ri_bind_mem)); |
0ac531c1 | 580 | rc = -ENOMEM; |
5ae711a2 | 581 | goto out3; |
c56c65fb | 582 | } |
bd7ed1d1 TT |
583 | break; |
584 | default: | |
cdd9ade7 CL |
585 | printk(KERN_ERR "RPC: Unsupported memory " |
586 | "registration mode: %d\n", memreg); | |
587 | rc = -ENOMEM; | |
5ae711a2 | 588 | goto out3; |
c56c65fb | 589 | } |
a0ce85f5 CL |
590 | dprintk("RPC: %s: memory registration strategy is '%s'\n", |
591 | __func__, ia->ri_ops->ro_displayname); | |
c56c65fb TT |
592 | |
593 | /* Else will do memory reg/dereg for each chunk */ | |
594 | ia->ri_memreg_strategy = memreg; | |
595 | ||
73806c88 | 596 | rwlock_init(&ia->ri_qplock); |
c56c65fb | 597 | return 0; |
5ae711a2 CL |
598 | |
599 | out3: | |
600 | ib_dealloc_pd(ia->ri_pd); | |
601 | ia->ri_pd = NULL; | |
c56c65fb TT |
602 | out2: |
603 | rdma_destroy_id(ia->ri_id); | |
fee08caf | 604 | ia->ri_id = NULL; |
c56c65fb TT |
605 | out1: |
606 | return rc; | |
607 | } | |
608 | ||
609 | /* | |
610 | * Clean up/close an IA. | |
611 | * o if event handles and PD have been initialized, free them. | |
612 | * o close the IA | |
613 | */ | |
614 | void | |
615 | rpcrdma_ia_close(struct rpcrdma_ia *ia) | |
616 | { | |
617 | int rc; | |
618 | ||
619 | dprintk("RPC: %s: entering\n", __func__); | |
620 | if (ia->ri_bind_mem != NULL) { | |
621 | rc = ib_dereg_mr(ia->ri_bind_mem); | |
622 | dprintk("RPC: %s: ib_dereg_mr returned %i\n", | |
623 | __func__, rc); | |
624 | } | |
fee08caf TT |
625 | if (ia->ri_id != NULL && !IS_ERR(ia->ri_id)) { |
626 | if (ia->ri_id->qp) | |
627 | rdma_destroy_qp(ia->ri_id); | |
628 | rdma_destroy_id(ia->ri_id); | |
629 | ia->ri_id = NULL; | |
630 | } | |
c56c65fb TT |
631 | if (ia->ri_pd != NULL && !IS_ERR(ia->ri_pd)) { |
632 | rc = ib_dealloc_pd(ia->ri_pd); | |
633 | dprintk("RPC: %s: ib_dealloc_pd returned %i\n", | |
634 | __func__, rc); | |
635 | } | |
c56c65fb TT |
636 | } |
637 | ||
638 | /* | |
639 | * Create unconnected endpoint. | |
640 | */ | |
641 | int | |
642 | rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia, | |
643 | struct rpcrdma_create_data_internal *cdata) | |
644 | { | |
7bc7972c | 645 | struct ib_device_attr *devattr = &ia->ri_devattr; |
fc664485 | 646 | struct ib_cq *sendcq, *recvcq; |
8e37210b | 647 | struct ib_cq_init_attr cq_attr = {}; |
5d40a8a5 | 648 | int rc, err; |
c56c65fb | 649 | |
c56c65fb | 650 | /* check provider's send/recv wr limits */ |
7bc7972c CL |
651 | if (cdata->max_requests > devattr->max_qp_wr) |
652 | cdata->max_requests = devattr->max_qp_wr; | |
c56c65fb TT |
653 | |
654 | ep->rep_attr.event_handler = rpcrdma_qp_async_error_upcall; | |
655 | ep->rep_attr.qp_context = ep; | |
c56c65fb TT |
656 | ep->rep_attr.srq = NULL; |
657 | ep->rep_attr.cap.max_send_wr = cdata->max_requests; | |
3968cb58 CL |
658 | rc = ia->ri_ops->ro_open(ia, ep, cdata); |
659 | if (rc) | |
660 | return rc; | |
c56c65fb TT |
661 | ep->rep_attr.cap.max_recv_wr = cdata->max_requests; |
662 | ep->rep_attr.cap.max_send_sge = (cdata->padding ? 4 : 2); | |
663 | ep->rep_attr.cap.max_recv_sge = 1; | |
664 | ep->rep_attr.cap.max_inline_data = 0; | |
665 | ep->rep_attr.sq_sig_type = IB_SIGNAL_REQ_WR; | |
666 | ep->rep_attr.qp_type = IB_QPT_RC; | |
667 | ep->rep_attr.port_num = ~0; | |
668 | ||
c05fbb5a CL |
669 | if (cdata->padding) { |
670 | ep->rep_padbuf = rpcrdma_alloc_regbuf(ia, cdata->padding, | |
671 | GFP_KERNEL); | |
672 | if (IS_ERR(ep->rep_padbuf)) | |
673 | return PTR_ERR(ep->rep_padbuf); | |
674 | } else | |
675 | ep->rep_padbuf = NULL; | |
676 | ||
c56c65fb TT |
677 | dprintk("RPC: %s: requested max: dtos: send %d recv %d; " |
678 | "iovs: send %d recv %d\n", | |
679 | __func__, | |
680 | ep->rep_attr.cap.max_send_wr, | |
681 | ep->rep_attr.cap.max_recv_wr, | |
682 | ep->rep_attr.cap.max_send_sge, | |
683 | ep->rep_attr.cap.max_recv_sge); | |
684 | ||
685 | /* set trigger for requesting send completion */ | |
fc664485 | 686 | ep->rep_cqinit = ep->rep_attr.cap.max_send_wr/2 - 1; |
e7104a2a CL |
687 | if (ep->rep_cqinit > RPCRDMA_MAX_UNSIGNALED_SENDS) |
688 | ep->rep_cqinit = RPCRDMA_MAX_UNSIGNALED_SENDS; | |
689 | else if (ep->rep_cqinit <= 2) | |
c56c65fb TT |
690 | ep->rep_cqinit = 0; |
691 | INIT_CQCOUNT(ep); | |
c56c65fb | 692 | init_waitqueue_head(&ep->rep_connect_wait); |
254f91e2 | 693 | INIT_DELAYED_WORK(&ep->rep_connect_worker, rpcrdma_connect_worker); |
c56c65fb | 694 | |
8e37210b | 695 | cq_attr.cqe = ep->rep_attr.cap.max_send_wr + 1; |
fc664485 | 696 | sendcq = ib_create_cq(ia->ri_id->device, rpcrdma_sendcq_upcall, |
8e37210b | 697 | rpcrdma_cq_async_error_upcall, ep, &cq_attr); |
fc664485 CL |
698 | if (IS_ERR(sendcq)) { |
699 | rc = PTR_ERR(sendcq); | |
700 | dprintk("RPC: %s: failed to create send CQ: %i\n", | |
c56c65fb TT |
701 | __func__, rc); |
702 | goto out1; | |
703 | } | |
704 | ||
fc664485 | 705 | rc = ib_req_notify_cq(sendcq, IB_CQ_NEXT_COMP); |
c56c65fb TT |
706 | if (rc) { |
707 | dprintk("RPC: %s: ib_req_notify_cq failed: %i\n", | |
708 | __func__, rc); | |
709 | goto out2; | |
710 | } | |
711 | ||
8e37210b | 712 | cq_attr.cqe = ep->rep_attr.cap.max_recv_wr + 1; |
fc664485 | 713 | recvcq = ib_create_cq(ia->ri_id->device, rpcrdma_recvcq_upcall, |
8e37210b | 714 | rpcrdma_cq_async_error_upcall, ep, &cq_attr); |
fc664485 CL |
715 | if (IS_ERR(recvcq)) { |
716 | rc = PTR_ERR(recvcq); | |
717 | dprintk("RPC: %s: failed to create recv CQ: %i\n", | |
718 | __func__, rc); | |
719 | goto out2; | |
720 | } | |
721 | ||
722 | rc = ib_req_notify_cq(recvcq, IB_CQ_NEXT_COMP); | |
723 | if (rc) { | |
724 | dprintk("RPC: %s: ib_req_notify_cq failed: %i\n", | |
725 | __func__, rc); | |
726 | ib_destroy_cq(recvcq); | |
727 | goto out2; | |
728 | } | |
729 | ||
730 | ep->rep_attr.send_cq = sendcq; | |
731 | ep->rep_attr.recv_cq = recvcq; | |
c56c65fb TT |
732 | |
733 | /* Initialize cma parameters */ | |
734 | ||
735 | /* RPC/RDMA does not use private data */ | |
736 | ep->rep_remote_cma.private_data = NULL; | |
737 | ep->rep_remote_cma.private_data_len = 0; | |
738 | ||
739 | /* Client offers RDMA Read but does not initiate */ | |
b334eaab | 740 | ep->rep_remote_cma.initiator_depth = 0; |
7bc7972c | 741 | if (devattr->max_qp_rd_atom > 32) /* arbitrary but <= 255 */ |
b334eaab TT |
742 | ep->rep_remote_cma.responder_resources = 32; |
743 | else | |
7bc7972c CL |
744 | ep->rep_remote_cma.responder_resources = |
745 | devattr->max_qp_rd_atom; | |
c56c65fb TT |
746 | |
747 | ep->rep_remote_cma.retry_count = 7; | |
748 | ep->rep_remote_cma.flow_control = 0; | |
749 | ep->rep_remote_cma.rnr_retry_count = 0; | |
750 | ||
751 | return 0; | |
752 | ||
753 | out2: | |
fc664485 | 754 | err = ib_destroy_cq(sendcq); |
5d40a8a5 CL |
755 | if (err) |
756 | dprintk("RPC: %s: ib_destroy_cq returned %i\n", | |
757 | __func__, err); | |
c56c65fb | 758 | out1: |
c05fbb5a | 759 | rpcrdma_free_regbuf(ia, ep->rep_padbuf); |
c56c65fb TT |
760 | return rc; |
761 | } | |
762 | ||
763 | /* | |
764 | * rpcrdma_ep_destroy | |
765 | * | |
766 | * Disconnect and destroy endpoint. After this, the only | |
767 | * valid operations on the ep are to free it (if dynamically | |
768 | * allocated) or re-create it. | |
c56c65fb | 769 | */ |
7f1d5419 | 770 | void |
c56c65fb TT |
771 | rpcrdma_ep_destroy(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) |
772 | { | |
773 | int rc; | |
774 | ||
775 | dprintk("RPC: %s: entering, connected is %d\n", | |
776 | __func__, ep->rep_connected); | |
777 | ||
254f91e2 CL |
778 | cancel_delayed_work_sync(&ep->rep_connect_worker); |
779 | ||
c56c65fb | 780 | if (ia->ri_id->qp) { |
282191cb | 781 | rpcrdma_ep_disconnect(ep, ia); |
fee08caf TT |
782 | rdma_destroy_qp(ia->ri_id); |
783 | ia->ri_id->qp = NULL; | |
c56c65fb TT |
784 | } |
785 | ||
c05fbb5a | 786 | rpcrdma_free_regbuf(ia, ep->rep_padbuf); |
c56c65fb | 787 | |
fc664485 CL |
788 | rpcrdma_clean_cq(ep->rep_attr.recv_cq); |
789 | rc = ib_destroy_cq(ep->rep_attr.recv_cq); | |
790 | if (rc) | |
791 | dprintk("RPC: %s: ib_destroy_cq returned %i\n", | |
792 | __func__, rc); | |
793 | ||
794 | rpcrdma_clean_cq(ep->rep_attr.send_cq); | |
795 | rc = ib_destroy_cq(ep->rep_attr.send_cq); | |
c56c65fb TT |
796 | if (rc) |
797 | dprintk("RPC: %s: ib_destroy_cq returned %i\n", | |
798 | __func__, rc); | |
c56c65fb TT |
799 | } |
800 | ||
801 | /* | |
802 | * Connect unconnected endpoint. | |
803 | */ | |
804 | int | |
805 | rpcrdma_ep_connect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) | |
806 | { | |
73806c88 | 807 | struct rdma_cm_id *id, *old; |
c56c65fb TT |
808 | int rc = 0; |
809 | int retry_count = 0; | |
c56c65fb | 810 | |
c055551e | 811 | if (ep->rep_connected != 0) { |
c56c65fb TT |
812 | struct rpcrdma_xprt *xprt; |
813 | retry: | |
ec62f40d | 814 | dprintk("RPC: %s: reconnecting...\n", __func__); |
282191cb CL |
815 | |
816 | rpcrdma_ep_disconnect(ep, ia); | |
a7bc211a | 817 | rpcrdma_flush_cqs(ep); |
c56c65fb TT |
818 | |
819 | xprt = container_of(ia, struct rpcrdma_xprt, rx_ia); | |
31a701a9 CL |
820 | ia->ri_ops->ro_reset(xprt); |
821 | ||
c56c65fb TT |
822 | id = rpcrdma_create_id(xprt, ia, |
823 | (struct sockaddr *)&xprt->rx_data.addr); | |
824 | if (IS_ERR(id)) { | |
ec62f40d | 825 | rc = -EHOSTUNREACH; |
c56c65fb TT |
826 | goto out; |
827 | } | |
828 | /* TEMP TEMP TEMP - fail if new device: | |
829 | * Deregister/remarshal *all* requests! | |
830 | * Close and recreate adapter, pd, etc! | |
831 | * Re-determine all attributes still sane! | |
832 | * More stuff I haven't thought of! | |
833 | * Rrrgh! | |
834 | */ | |
835 | if (ia->ri_id->device != id->device) { | |
836 | printk("RPC: %s: can't reconnect on " | |
837 | "different device!\n", __func__); | |
838 | rdma_destroy_id(id); | |
ec62f40d | 839 | rc = -ENETUNREACH; |
c56c65fb TT |
840 | goto out; |
841 | } | |
842 | /* END TEMP */ | |
ec62f40d CL |
843 | rc = rdma_create_qp(id, ia->ri_pd, &ep->rep_attr); |
844 | if (rc) { | |
845 | dprintk("RPC: %s: rdma_create_qp failed %i\n", | |
846 | __func__, rc); | |
847 | rdma_destroy_id(id); | |
848 | rc = -ENETUNREACH; | |
849 | goto out; | |
850 | } | |
73806c88 CL |
851 | |
852 | write_lock(&ia->ri_qplock); | |
853 | old = ia->ri_id; | |
c56c65fb | 854 | ia->ri_id = id; |
73806c88 CL |
855 | write_unlock(&ia->ri_qplock); |
856 | ||
857 | rdma_destroy_qp(old); | |
858 | rdma_destroy_id(old); | |
ec62f40d CL |
859 | } else { |
860 | dprintk("RPC: %s: connecting...\n", __func__); | |
861 | rc = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr); | |
862 | if (rc) { | |
863 | dprintk("RPC: %s: rdma_create_qp failed %i\n", | |
864 | __func__, rc); | |
865 | /* do not update ep->rep_connected */ | |
866 | return -ENETUNREACH; | |
867 | } | |
c56c65fb TT |
868 | } |
869 | ||
c56c65fb TT |
870 | ep->rep_connected = 0; |
871 | ||
872 | rc = rdma_connect(ia->ri_id, &ep->rep_remote_cma); | |
873 | if (rc) { | |
874 | dprintk("RPC: %s: rdma_connect() failed with %i\n", | |
875 | __func__, rc); | |
876 | goto out; | |
877 | } | |
878 | ||
c56c65fb TT |
879 | wait_event_interruptible(ep->rep_connect_wait, ep->rep_connected != 0); |
880 | ||
881 | /* | |
882 | * Check state. A non-peer reject indicates no listener | |
883 | * (ECONNREFUSED), which may be a transient state. All | |
884 | * others indicate a transport condition which has already | |
885 | * undergone a best-effort. | |
886 | */ | |
f64f9e71 JP |
887 | if (ep->rep_connected == -ECONNREFUSED && |
888 | ++retry_count <= RDMA_CONNECT_RETRY_MAX) { | |
c56c65fb TT |
889 | dprintk("RPC: %s: non-peer_reject, retry\n", __func__); |
890 | goto retry; | |
891 | } | |
892 | if (ep->rep_connected <= 0) { | |
893 | /* Sometimes, the only way to reliably connect to remote | |
894 | * CMs is to use same nonzero values for ORD and IRD. */ | |
b334eaab TT |
895 | if (retry_count++ <= RDMA_CONNECT_RETRY_MAX + 1 && |
896 | (ep->rep_remote_cma.responder_resources == 0 || | |
897 | ep->rep_remote_cma.initiator_depth != | |
898 | ep->rep_remote_cma.responder_resources)) { | |
899 | if (ep->rep_remote_cma.responder_resources == 0) | |
900 | ep->rep_remote_cma.responder_resources = 1; | |
901 | ep->rep_remote_cma.initiator_depth = | |
902 | ep->rep_remote_cma.responder_resources; | |
c56c65fb | 903 | goto retry; |
b334eaab | 904 | } |
c56c65fb TT |
905 | rc = ep->rep_connected; |
906 | } else { | |
907 | dprintk("RPC: %s: connected\n", __func__); | |
908 | } | |
909 | ||
910 | out: | |
911 | if (rc) | |
912 | ep->rep_connected = rc; | |
913 | return rc; | |
914 | } | |
915 | ||
916 | /* | |
917 | * rpcrdma_ep_disconnect | |
918 | * | |
919 | * This is separate from destroy to facilitate the ability | |
920 | * to reconnect without recreating the endpoint. | |
921 | * | |
922 | * This call is not reentrant, and must not be made in parallel | |
923 | * on the same endpoint. | |
924 | */ | |
282191cb | 925 | void |
c56c65fb TT |
926 | rpcrdma_ep_disconnect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) |
927 | { | |
928 | int rc; | |
929 | ||
a7bc211a | 930 | rpcrdma_flush_cqs(ep); |
c56c65fb TT |
931 | rc = rdma_disconnect(ia->ri_id); |
932 | if (!rc) { | |
933 | /* returns without wait if not connected */ | |
934 | wait_event_interruptible(ep->rep_connect_wait, | |
935 | ep->rep_connected != 1); | |
936 | dprintk("RPC: %s: after wait, %sconnected\n", __func__, | |
937 | (ep->rep_connected == 1) ? "still " : "dis"); | |
938 | } else { | |
939 | dprintk("RPC: %s: rdma_disconnect %i\n", __func__, rc); | |
940 | ep->rep_connected = rc; | |
941 | } | |
c56c65fb TT |
942 | } |
943 | ||
1392402c CL |
944 | static struct rpcrdma_req * |
945 | rpcrdma_create_req(struct rpcrdma_xprt *r_xprt) | |
946 | { | |
1392402c | 947 | struct rpcrdma_req *req; |
1392402c | 948 | |
85275c87 | 949 | req = kzalloc(sizeof(*req), GFP_KERNEL); |
1392402c | 950 | if (req == NULL) |
85275c87 | 951 | return ERR_PTR(-ENOMEM); |
1392402c | 952 | |
1392402c CL |
953 | req->rl_buffer = &r_xprt->rx_buf; |
954 | return req; | |
1392402c CL |
955 | } |
956 | ||
957 | static struct rpcrdma_rep * | |
958 | rpcrdma_create_rep(struct rpcrdma_xprt *r_xprt) | |
959 | { | |
960 | struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data; | |
1392402c CL |
961 | struct rpcrdma_ia *ia = &r_xprt->rx_ia; |
962 | struct rpcrdma_rep *rep; | |
963 | int rc; | |
964 | ||
965 | rc = -ENOMEM; | |
6b1184cd | 966 | rep = kzalloc(sizeof(*rep), GFP_KERNEL); |
1392402c CL |
967 | if (rep == NULL) |
968 | goto out; | |
1392402c | 969 | |
6b1184cd CL |
970 | rep->rr_rdmabuf = rpcrdma_alloc_regbuf(ia, cdata->inline_rsize, |
971 | GFP_KERNEL); | |
972 | if (IS_ERR(rep->rr_rdmabuf)) { | |
973 | rc = PTR_ERR(rep->rr_rdmabuf); | |
1392402c | 974 | goto out_free; |
6b1184cd | 975 | } |
1392402c CL |
976 | |
977 | rep->rr_buffer = &r_xprt->rx_buf; | |
978 | return rep; | |
979 | ||
980 | out_free: | |
981 | kfree(rep); | |
982 | out: | |
983 | return ERR_PTR(rc); | |
984 | } | |
985 | ||
c56c65fb | 986 | int |
ac920d04 | 987 | rpcrdma_buffer_create(struct rpcrdma_xprt *r_xprt) |
c56c65fb | 988 | { |
ac920d04 CL |
989 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; |
990 | struct rpcrdma_ia *ia = &r_xprt->rx_ia; | |
991 | struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data; | |
c56c65fb | 992 | char *p; |
1392402c | 993 | size_t len; |
c56c65fb TT |
994 | int i, rc; |
995 | ||
996 | buf->rb_max_requests = cdata->max_requests; | |
997 | spin_lock_init(&buf->rb_lock); | |
c56c65fb TT |
998 | |
999 | /* Need to allocate: | |
1000 | * 1. arrays for send and recv pointers | |
1001 | * 2. arrays of struct rpcrdma_req to fill in pointers | |
1002 | * 3. array of struct rpcrdma_rep for replies | |
c56c65fb TT |
1003 | * Send/recv buffers in req/rep need to be registered |
1004 | */ | |
c56c65fb TT |
1005 | len = buf->rb_max_requests * |
1006 | (sizeof(struct rpcrdma_req *) + sizeof(struct rpcrdma_rep *)); | |
c56c65fb | 1007 | |
c56c65fb TT |
1008 | p = kzalloc(len, GFP_KERNEL); |
1009 | if (p == NULL) { | |
1010 | dprintk("RPC: %s: req_t/rep_t/pad kzalloc(%zd) failed\n", | |
1011 | __func__, len); | |
1012 | rc = -ENOMEM; | |
1013 | goto out; | |
1014 | } | |
1015 | buf->rb_pool = p; /* for freeing it later */ | |
1016 | ||
1017 | buf->rb_send_bufs = (struct rpcrdma_req **) p; | |
1018 | p = (char *) &buf->rb_send_bufs[buf->rb_max_requests]; | |
1019 | buf->rb_recv_bufs = (struct rpcrdma_rep **) p; | |
1020 | p = (char *) &buf->rb_recv_bufs[buf->rb_max_requests]; | |
1021 | ||
91e70e70 CL |
1022 | rc = ia->ri_ops->ro_init(r_xprt); |
1023 | if (rc) | |
1024 | goto out; | |
c56c65fb | 1025 | |
c56c65fb TT |
1026 | for (i = 0; i < buf->rb_max_requests; i++) { |
1027 | struct rpcrdma_req *req; | |
1028 | struct rpcrdma_rep *rep; | |
1029 | ||
1392402c CL |
1030 | req = rpcrdma_create_req(r_xprt); |
1031 | if (IS_ERR(req)) { | |
c56c65fb TT |
1032 | dprintk("RPC: %s: request buffer %d alloc" |
1033 | " failed\n", __func__, i); | |
1392402c | 1034 | rc = PTR_ERR(req); |
c56c65fb TT |
1035 | goto out; |
1036 | } | |
c56c65fb | 1037 | buf->rb_send_bufs[i] = req; |
c56c65fb | 1038 | |
1392402c CL |
1039 | rep = rpcrdma_create_rep(r_xprt); |
1040 | if (IS_ERR(rep)) { | |
c56c65fb TT |
1041 | dprintk("RPC: %s: reply buffer %d alloc failed\n", |
1042 | __func__, i); | |
1392402c | 1043 | rc = PTR_ERR(rep); |
c56c65fb TT |
1044 | goto out; |
1045 | } | |
c56c65fb | 1046 | buf->rb_recv_bufs[i] = rep; |
c56c65fb | 1047 | } |
1392402c | 1048 | |
c56c65fb TT |
1049 | return 0; |
1050 | out: | |
1051 | rpcrdma_buffer_destroy(buf); | |
1052 | return rc; | |
1053 | } | |
1054 | ||
1392402c CL |
1055 | static void |
1056 | rpcrdma_destroy_rep(struct rpcrdma_ia *ia, struct rpcrdma_rep *rep) | |
1057 | { | |
1058 | if (!rep) | |
1059 | return; | |
1060 | ||
6b1184cd | 1061 | rpcrdma_free_regbuf(ia, rep->rr_rdmabuf); |
1392402c CL |
1062 | kfree(rep); |
1063 | } | |
1064 | ||
1065 | static void | |
1066 | rpcrdma_destroy_req(struct rpcrdma_ia *ia, struct rpcrdma_req *req) | |
1067 | { | |
1068 | if (!req) | |
1069 | return; | |
1070 | ||
0ca77dc3 | 1071 | rpcrdma_free_regbuf(ia, req->rl_sendbuf); |
85275c87 | 1072 | rpcrdma_free_regbuf(ia, req->rl_rdmabuf); |
1392402c CL |
1073 | kfree(req); |
1074 | } | |
1075 | ||
c56c65fb TT |
1076 | void |
1077 | rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf) | |
1078 | { | |
c56c65fb | 1079 | struct rpcrdma_ia *ia = rdmab_to_ia(buf); |
2e84522c | 1080 | int i; |
c56c65fb TT |
1081 | |
1082 | /* clean up in reverse order from create | |
1083 | * 1. recv mr memory (mr free, then kfree) | |
c56c65fb | 1084 | * 2. send mr memory (mr free, then kfree) |
2e84522c | 1085 | * 3. MWs |
c56c65fb TT |
1086 | */ |
1087 | dprintk("RPC: %s: entering\n", __func__); | |
1088 | ||
1089 | for (i = 0; i < buf->rb_max_requests; i++) { | |
1392402c CL |
1090 | if (buf->rb_recv_bufs) |
1091 | rpcrdma_destroy_rep(ia, buf->rb_recv_bufs[i]); | |
1092 | if (buf->rb_send_bufs) | |
1093 | rpcrdma_destroy_req(ia, buf->rb_send_bufs[i]); | |
c56c65fb TT |
1094 | } |
1095 | ||
4561f347 | 1096 | ia->ri_ops->ro_destroy(buf); |
4034ba04 | 1097 | |
c56c65fb TT |
1098 | kfree(buf->rb_pool); |
1099 | } | |
1100 | ||
c2922c02 CL |
1101 | /* "*mw" can be NULL when rpcrdma_buffer_get_mrs() fails, leaving |
1102 | * some req segments uninitialized. | |
1103 | */ | |
1104 | static void | |
1105 | rpcrdma_buffer_put_mr(struct rpcrdma_mw **mw, struct rpcrdma_buffer *buf) | |
1106 | { | |
1107 | if (*mw) { | |
1108 | list_add_tail(&(*mw)->mw_list, &buf->rb_mws); | |
1109 | *mw = NULL; | |
1110 | } | |
1111 | } | |
1112 | ||
1113 | /* Cycle mw's back in reverse order, and "spin" them. | |
1114 | * This delays and scrambles reuse as much as possible. | |
1115 | */ | |
1116 | static void | |
1117 | rpcrdma_buffer_put_mrs(struct rpcrdma_req *req, struct rpcrdma_buffer *buf) | |
1118 | { | |
1119 | struct rpcrdma_mr_seg *seg = req->rl_segments; | |
1120 | struct rpcrdma_mr_seg *seg1 = seg; | |
1121 | int i; | |
1122 | ||
1123 | for (i = 1, seg++; i < RPCRDMA_MAX_SEGS; seg++, i++) | |
3eb35810 CL |
1124 | rpcrdma_buffer_put_mr(&seg->rl_mw, buf); |
1125 | rpcrdma_buffer_put_mr(&seg1->rl_mw, buf); | |
c2922c02 CL |
1126 | } |
1127 | ||
1128 | static void | |
1129 | rpcrdma_buffer_put_sendbuf(struct rpcrdma_req *req, struct rpcrdma_buffer *buf) | |
1130 | { | |
1131 | buf->rb_send_bufs[--buf->rb_send_index] = req; | |
1132 | req->rl_niovs = 0; | |
1133 | if (req->rl_reply) { | |
1134 | buf->rb_recv_bufs[--buf->rb_recv_index] = req->rl_reply; | |
1135 | req->rl_reply->rr_func = NULL; | |
1136 | req->rl_reply = NULL; | |
1137 | } | |
1138 | } | |
1139 | ||
6814baea | 1140 | /* rpcrdma_unmap_one() was already done during deregistration. |
ddb6bebc CL |
1141 | * Redo only the ib_post_send(). |
1142 | */ | |
1143 | static void | |
1144 | rpcrdma_retry_local_inv(struct rpcrdma_mw *r, struct rpcrdma_ia *ia) | |
1145 | { | |
1146 | struct rpcrdma_xprt *r_xprt = | |
1147 | container_of(ia, struct rpcrdma_xprt, rx_ia); | |
1148 | struct ib_send_wr invalidate_wr, *bad_wr; | |
1149 | int rc; | |
1150 | ||
1151 | dprintk("RPC: %s: FRMR %p is stale\n", __func__, r); | |
1152 | ||
1153 | /* When this FRMR is re-inserted into rb_mws, it is no longer stale */ | |
dab7e3b8 | 1154 | r->r.frmr.fr_state = FRMR_IS_INVALID; |
ddb6bebc CL |
1155 | |
1156 | memset(&invalidate_wr, 0, sizeof(invalidate_wr)); | |
1157 | invalidate_wr.wr_id = (unsigned long)(void *)r; | |
1158 | invalidate_wr.opcode = IB_WR_LOCAL_INV; | |
ddb6bebc CL |
1159 | invalidate_wr.ex.invalidate_rkey = r->r.frmr.fr_mr->rkey; |
1160 | DECR_CQCOUNT(&r_xprt->rx_ep); | |
1161 | ||
1162 | dprintk("RPC: %s: frmr %p invalidating rkey %08x\n", | |
1163 | __func__, r, r->r.frmr.fr_mr->rkey); | |
1164 | ||
1165 | read_lock(&ia->ri_qplock); | |
1166 | rc = ib_post_send(ia->ri_id->qp, &invalidate_wr, &bad_wr); | |
1167 | read_unlock(&ia->ri_qplock); | |
1168 | if (rc) { | |
1169 | /* Force rpcrdma_buffer_get() to retry */ | |
1170 | r->r.frmr.fr_state = FRMR_IS_STALE; | |
1171 | dprintk("RPC: %s: ib_post_send failed, %i\n", | |
1172 | __func__, rc); | |
1173 | } | |
1174 | } | |
1175 | ||
1176 | static void | |
1177 | rpcrdma_retry_flushed_linv(struct list_head *stale, | |
1178 | struct rpcrdma_buffer *buf) | |
1179 | { | |
1180 | struct rpcrdma_ia *ia = rdmab_to_ia(buf); | |
1181 | struct list_head *pos; | |
1182 | struct rpcrdma_mw *r; | |
1183 | unsigned long flags; | |
1184 | ||
1185 | list_for_each(pos, stale) { | |
1186 | r = list_entry(pos, struct rpcrdma_mw, mw_list); | |
1187 | rpcrdma_retry_local_inv(r, ia); | |
1188 | } | |
1189 | ||
1190 | spin_lock_irqsave(&buf->rb_lock, flags); | |
1191 | list_splice_tail(stale, &buf->rb_mws); | |
1192 | spin_unlock_irqrestore(&buf->rb_lock, flags); | |
1193 | } | |
1194 | ||
1195 | static struct rpcrdma_req * | |
1196 | rpcrdma_buffer_get_frmrs(struct rpcrdma_req *req, struct rpcrdma_buffer *buf, | |
1197 | struct list_head *stale) | |
1198 | { | |
1199 | struct rpcrdma_mw *r; | |
1200 | int i; | |
1201 | ||
1202 | i = RPCRDMA_MAX_SEGS - 1; | |
1203 | while (!list_empty(&buf->rb_mws)) { | |
1204 | r = list_entry(buf->rb_mws.next, | |
1205 | struct rpcrdma_mw, mw_list); | |
1206 | list_del(&r->mw_list); | |
1207 | if (r->r.frmr.fr_state == FRMR_IS_STALE) { | |
1208 | list_add(&r->mw_list, stale); | |
1209 | continue; | |
1210 | } | |
3eb35810 | 1211 | req->rl_segments[i].rl_mw = r; |
ddb6bebc CL |
1212 | if (unlikely(i-- == 0)) |
1213 | return req; /* Success */ | |
1214 | } | |
1215 | ||
1216 | /* Not enough entries on rb_mws for this req */ | |
1217 | rpcrdma_buffer_put_sendbuf(req, buf); | |
1218 | rpcrdma_buffer_put_mrs(req, buf); | |
1219 | return NULL; | |
1220 | } | |
1221 | ||
c2922c02 | 1222 | static struct rpcrdma_req * |
ddb6bebc | 1223 | rpcrdma_buffer_get_fmrs(struct rpcrdma_req *req, struct rpcrdma_buffer *buf) |
c2922c02 CL |
1224 | { |
1225 | struct rpcrdma_mw *r; | |
1226 | int i; | |
1227 | ||
1228 | i = RPCRDMA_MAX_SEGS - 1; | |
1229 | while (!list_empty(&buf->rb_mws)) { | |
1230 | r = list_entry(buf->rb_mws.next, | |
1231 | struct rpcrdma_mw, mw_list); | |
1232 | list_del(&r->mw_list); | |
3eb35810 | 1233 | req->rl_segments[i].rl_mw = r; |
c2922c02 CL |
1234 | if (unlikely(i-- == 0)) |
1235 | return req; /* Success */ | |
1236 | } | |
1237 | ||
1238 | /* Not enough entries on rb_mws for this req */ | |
1239 | rpcrdma_buffer_put_sendbuf(req, buf); | |
1240 | rpcrdma_buffer_put_mrs(req, buf); | |
1241 | return NULL; | |
1242 | } | |
1243 | ||
c56c65fb TT |
1244 | /* |
1245 | * Get a set of request/reply buffers. | |
1246 | * | |
1247 | * Reply buffer (if needed) is attached to send buffer upon return. | |
1248 | * Rule: | |
1249 | * rb_send_index and rb_recv_index MUST always be pointing to the | |
1250 | * *next* available buffer (non-NULL). They are incremented after | |
1251 | * removing buffers, and decremented *before* returning them. | |
1252 | */ | |
1253 | struct rpcrdma_req * | |
1254 | rpcrdma_buffer_get(struct rpcrdma_buffer *buffers) | |
1255 | { | |
c2922c02 | 1256 | struct rpcrdma_ia *ia = rdmab_to_ia(buffers); |
ddb6bebc | 1257 | struct list_head stale; |
c56c65fb TT |
1258 | struct rpcrdma_req *req; |
1259 | unsigned long flags; | |
1260 | ||
1261 | spin_lock_irqsave(&buffers->rb_lock, flags); | |
1262 | if (buffers->rb_send_index == buffers->rb_max_requests) { | |
1263 | spin_unlock_irqrestore(&buffers->rb_lock, flags); | |
1264 | dprintk("RPC: %s: out of request buffers\n", __func__); | |
1265 | return ((struct rpcrdma_req *)NULL); | |
1266 | } | |
1267 | ||
1268 | req = buffers->rb_send_bufs[buffers->rb_send_index]; | |
1269 | if (buffers->rb_send_index < buffers->rb_recv_index) { | |
1270 | dprintk("RPC: %s: %d extra receives outstanding (ok)\n", | |
1271 | __func__, | |
1272 | buffers->rb_recv_index - buffers->rb_send_index); | |
1273 | req->rl_reply = NULL; | |
1274 | } else { | |
1275 | req->rl_reply = buffers->rb_recv_bufs[buffers->rb_recv_index]; | |
1276 | buffers->rb_recv_bufs[buffers->rb_recv_index++] = NULL; | |
1277 | } | |
1278 | buffers->rb_send_bufs[buffers->rb_send_index++] = NULL; | |
ddb6bebc CL |
1279 | |
1280 | INIT_LIST_HEAD(&stale); | |
c2922c02 CL |
1281 | switch (ia->ri_memreg_strategy) { |
1282 | case RPCRDMA_FRMR: | |
ddb6bebc CL |
1283 | req = rpcrdma_buffer_get_frmrs(req, buffers, &stale); |
1284 | break; | |
c2922c02 | 1285 | case RPCRDMA_MTHCAFMR: |
ddb6bebc | 1286 | req = rpcrdma_buffer_get_fmrs(req, buffers); |
c2922c02 CL |
1287 | break; |
1288 | default: | |
1289 | break; | |
c56c65fb TT |
1290 | } |
1291 | spin_unlock_irqrestore(&buffers->rb_lock, flags); | |
ddb6bebc CL |
1292 | if (!list_empty(&stale)) |
1293 | rpcrdma_retry_flushed_linv(&stale, buffers); | |
c56c65fb TT |
1294 | return req; |
1295 | } | |
1296 | ||
1297 | /* | |
1298 | * Put request/reply buffers back into pool. | |
1299 | * Pre-decrement counter/array index. | |
1300 | */ | |
1301 | void | |
1302 | rpcrdma_buffer_put(struct rpcrdma_req *req) | |
1303 | { | |
1304 | struct rpcrdma_buffer *buffers = req->rl_buffer; | |
1305 | struct rpcrdma_ia *ia = rdmab_to_ia(buffers); | |
c56c65fb TT |
1306 | unsigned long flags; |
1307 | ||
c56c65fb | 1308 | spin_lock_irqsave(&buffers->rb_lock, flags); |
c2922c02 | 1309 | rpcrdma_buffer_put_sendbuf(req, buffers); |
c56c65fb | 1310 | switch (ia->ri_memreg_strategy) { |
3197d309 | 1311 | case RPCRDMA_FRMR: |
c56c65fb | 1312 | case RPCRDMA_MTHCAFMR: |
c2922c02 | 1313 | rpcrdma_buffer_put_mrs(req, buffers); |
c56c65fb TT |
1314 | break; |
1315 | default: | |
1316 | break; | |
1317 | } | |
1318 | spin_unlock_irqrestore(&buffers->rb_lock, flags); | |
1319 | } | |
1320 | ||
1321 | /* | |
1322 | * Recover reply buffers from pool. | |
1323 | * This happens when recovering from error conditions. | |
1324 | * Post-increment counter/array index. | |
1325 | */ | |
1326 | void | |
1327 | rpcrdma_recv_buffer_get(struct rpcrdma_req *req) | |
1328 | { | |
1329 | struct rpcrdma_buffer *buffers = req->rl_buffer; | |
1330 | unsigned long flags; | |
1331 | ||
c56c65fb TT |
1332 | spin_lock_irqsave(&buffers->rb_lock, flags); |
1333 | if (buffers->rb_recv_index < buffers->rb_max_requests) { | |
1334 | req->rl_reply = buffers->rb_recv_bufs[buffers->rb_recv_index]; | |
1335 | buffers->rb_recv_bufs[buffers->rb_recv_index++] = NULL; | |
1336 | } | |
1337 | spin_unlock_irqrestore(&buffers->rb_lock, flags); | |
1338 | } | |
1339 | ||
1340 | /* | |
1341 | * Put reply buffers back into pool when not attached to | |
b45ccfd2 | 1342 | * request. This happens in error conditions. |
c56c65fb TT |
1343 | */ |
1344 | void | |
1345 | rpcrdma_recv_buffer_put(struct rpcrdma_rep *rep) | |
1346 | { | |
1347 | struct rpcrdma_buffer *buffers = rep->rr_buffer; | |
1348 | unsigned long flags; | |
1349 | ||
1350 | rep->rr_func = NULL; | |
1351 | spin_lock_irqsave(&buffers->rb_lock, flags); | |
1352 | buffers->rb_recv_bufs[--buffers->rb_recv_index] = rep; | |
1353 | spin_unlock_irqrestore(&buffers->rb_lock, flags); | |
1354 | } | |
1355 | ||
1356 | /* | |
1357 | * Wrappers for internal-use kmalloc memory registration, used by buffer code. | |
1358 | */ | |
1359 | ||
d654788e CL |
1360 | void |
1361 | rpcrdma_mapping_error(struct rpcrdma_mr_seg *seg) | |
1362 | { | |
1363 | dprintk("RPC: map_one: offset %p iova %llx len %zu\n", | |
1364 | seg->mr_offset, | |
1365 | (unsigned long long)seg->mr_dma, seg->mr_dmalen); | |
1366 | } | |
1367 | ||
df515ca7 | 1368 | static int |
c56c65fb TT |
1369 | rpcrdma_register_internal(struct rpcrdma_ia *ia, void *va, int len, |
1370 | struct ib_mr **mrp, struct ib_sge *iov) | |
1371 | { | |
1372 | struct ib_phys_buf ipb; | |
1373 | struct ib_mr *mr; | |
1374 | int rc; | |
1375 | ||
1376 | /* | |
1377 | * All memory passed here was kmalloc'ed, therefore phys-contiguous. | |
1378 | */ | |
1379 | iov->addr = ib_dma_map_single(ia->ri_id->device, | |
1380 | va, len, DMA_BIDIRECTIONAL); | |
bf858ab0 YB |
1381 | if (ib_dma_mapping_error(ia->ri_id->device, iov->addr)) |
1382 | return -ENOMEM; | |
1383 | ||
c56c65fb TT |
1384 | iov->length = len; |
1385 | ||
bd7ed1d1 TT |
1386 | if (ia->ri_have_dma_lkey) { |
1387 | *mrp = NULL; | |
1388 | iov->lkey = ia->ri_dma_lkey; | |
1389 | return 0; | |
1390 | } else if (ia->ri_bind_mem != NULL) { | |
c56c65fb TT |
1391 | *mrp = NULL; |
1392 | iov->lkey = ia->ri_bind_mem->lkey; | |
1393 | return 0; | |
1394 | } | |
1395 | ||
1396 | ipb.addr = iov->addr; | |
1397 | ipb.size = iov->length; | |
1398 | mr = ib_reg_phys_mr(ia->ri_pd, &ipb, 1, | |
1399 | IB_ACCESS_LOCAL_WRITE, &iov->addr); | |
1400 | ||
1401 | dprintk("RPC: %s: phys convert: 0x%llx " | |
1402 | "registered 0x%llx length %d\n", | |
a56daeb7 AM |
1403 | __func__, (unsigned long long)ipb.addr, |
1404 | (unsigned long long)iov->addr, len); | |
c56c65fb TT |
1405 | |
1406 | if (IS_ERR(mr)) { | |
1407 | *mrp = NULL; | |
1408 | rc = PTR_ERR(mr); | |
1409 | dprintk("RPC: %s: failed with %i\n", __func__, rc); | |
1410 | } else { | |
1411 | *mrp = mr; | |
1412 | iov->lkey = mr->lkey; | |
1413 | rc = 0; | |
1414 | } | |
1415 | ||
1416 | return rc; | |
1417 | } | |
1418 | ||
df515ca7 | 1419 | static int |
c56c65fb TT |
1420 | rpcrdma_deregister_internal(struct rpcrdma_ia *ia, |
1421 | struct ib_mr *mr, struct ib_sge *iov) | |
1422 | { | |
1423 | int rc; | |
1424 | ||
1425 | ib_dma_unmap_single(ia->ri_id->device, | |
1426 | iov->addr, iov->length, DMA_BIDIRECTIONAL); | |
1427 | ||
1428 | if (NULL == mr) | |
1429 | return 0; | |
1430 | ||
1431 | rc = ib_dereg_mr(mr); | |
1432 | if (rc) | |
1433 | dprintk("RPC: %s: ib_dereg_mr failed %i\n", __func__, rc); | |
1434 | return rc; | |
1435 | } | |
1436 | ||
9128c3e7 CL |
1437 | /** |
1438 | * rpcrdma_alloc_regbuf - kmalloc and register memory for SEND/RECV buffers | |
1439 | * @ia: controlling rpcrdma_ia | |
1440 | * @size: size of buffer to be allocated, in bytes | |
1441 | * @flags: GFP flags | |
1442 | * | |
1443 | * Returns pointer to private header of an area of internally | |
1444 | * registered memory, or an ERR_PTR. The registered buffer follows | |
1445 | * the end of the private header. | |
1446 | * | |
1447 | * xprtrdma uses a regbuf for posting an outgoing RDMA SEND, or for | |
1448 | * receiving the payload of RDMA RECV operations. regbufs are not | |
1449 | * used for RDMA READ/WRITE operations, thus are registered only for | |
1450 | * LOCAL access. | |
1451 | */ | |
1452 | struct rpcrdma_regbuf * | |
1453 | rpcrdma_alloc_regbuf(struct rpcrdma_ia *ia, size_t size, gfp_t flags) | |
1454 | { | |
1455 | struct rpcrdma_regbuf *rb; | |
1456 | int rc; | |
1457 | ||
1458 | rc = -ENOMEM; | |
1459 | rb = kmalloc(sizeof(*rb) + size, flags); | |
1460 | if (rb == NULL) | |
1461 | goto out; | |
1462 | ||
1463 | rb->rg_size = size; | |
1464 | rb->rg_owner = NULL; | |
1465 | rc = rpcrdma_register_internal(ia, rb->rg_base, size, | |
1466 | &rb->rg_mr, &rb->rg_iov); | |
1467 | if (rc) | |
1468 | goto out_free; | |
1469 | ||
1470 | return rb; | |
1471 | ||
1472 | out_free: | |
1473 | kfree(rb); | |
1474 | out: | |
1475 | return ERR_PTR(rc); | |
1476 | } | |
1477 | ||
1478 | /** | |
1479 | * rpcrdma_free_regbuf - deregister and free registered buffer | |
1480 | * @ia: controlling rpcrdma_ia | |
1481 | * @rb: regbuf to be deregistered and freed | |
1482 | */ | |
1483 | void | |
1484 | rpcrdma_free_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb) | |
1485 | { | |
1486 | if (rb) { | |
1487 | rpcrdma_deregister_internal(ia, rb->rg_mr, &rb->rg_iov); | |
1488 | kfree(rb); | |
1489 | } | |
1490 | } | |
1491 | ||
c56c65fb TT |
1492 | /* |
1493 | * Prepost any receive buffer, then post send. | |
1494 | * | |
1495 | * Receive buffer is donated to hardware, reclaimed upon recv completion. | |
1496 | */ | |
1497 | int | |
1498 | rpcrdma_ep_post(struct rpcrdma_ia *ia, | |
1499 | struct rpcrdma_ep *ep, | |
1500 | struct rpcrdma_req *req) | |
1501 | { | |
1502 | struct ib_send_wr send_wr, *send_wr_fail; | |
1503 | struct rpcrdma_rep *rep = req->rl_reply; | |
1504 | int rc; | |
1505 | ||
1506 | if (rep) { | |
1507 | rc = rpcrdma_ep_post_recv(ia, ep, rep); | |
1508 | if (rc) | |
1509 | goto out; | |
1510 | req->rl_reply = NULL; | |
1511 | } | |
1512 | ||
1513 | send_wr.next = NULL; | |
e46ac34c | 1514 | send_wr.wr_id = RPCRDMA_IGNORE_COMPLETION; |
c56c65fb TT |
1515 | send_wr.sg_list = req->rl_send_iov; |
1516 | send_wr.num_sge = req->rl_niovs; | |
1517 | send_wr.opcode = IB_WR_SEND; | |
c56c65fb TT |
1518 | if (send_wr.num_sge == 4) /* no need to sync any pad (constant) */ |
1519 | ib_dma_sync_single_for_device(ia->ri_id->device, | |
1520 | req->rl_send_iov[3].addr, req->rl_send_iov[3].length, | |
1521 | DMA_TO_DEVICE); | |
1522 | ib_dma_sync_single_for_device(ia->ri_id->device, | |
1523 | req->rl_send_iov[1].addr, req->rl_send_iov[1].length, | |
1524 | DMA_TO_DEVICE); | |
1525 | ib_dma_sync_single_for_device(ia->ri_id->device, | |
1526 | req->rl_send_iov[0].addr, req->rl_send_iov[0].length, | |
1527 | DMA_TO_DEVICE); | |
1528 | ||
1529 | if (DECR_CQCOUNT(ep) > 0) | |
1530 | send_wr.send_flags = 0; | |
1531 | else { /* Provider must take a send completion every now and then */ | |
1532 | INIT_CQCOUNT(ep); | |
1533 | send_wr.send_flags = IB_SEND_SIGNALED; | |
1534 | } | |
1535 | ||
1536 | rc = ib_post_send(ia->ri_id->qp, &send_wr, &send_wr_fail); | |
1537 | if (rc) | |
1538 | dprintk("RPC: %s: ib_post_send returned %i\n", __func__, | |
1539 | rc); | |
1540 | out: | |
1541 | return rc; | |
1542 | } | |
1543 | ||
1544 | /* | |
1545 | * (Re)post a receive buffer. | |
1546 | */ | |
1547 | int | |
1548 | rpcrdma_ep_post_recv(struct rpcrdma_ia *ia, | |
1549 | struct rpcrdma_ep *ep, | |
1550 | struct rpcrdma_rep *rep) | |
1551 | { | |
1552 | struct ib_recv_wr recv_wr, *recv_wr_fail; | |
1553 | int rc; | |
1554 | ||
1555 | recv_wr.next = NULL; | |
1556 | recv_wr.wr_id = (u64) (unsigned long) rep; | |
6b1184cd | 1557 | recv_wr.sg_list = &rep->rr_rdmabuf->rg_iov; |
c56c65fb TT |
1558 | recv_wr.num_sge = 1; |
1559 | ||
1560 | ib_dma_sync_single_for_cpu(ia->ri_id->device, | |
6b1184cd CL |
1561 | rdmab_addr(rep->rr_rdmabuf), |
1562 | rdmab_length(rep->rr_rdmabuf), | |
1563 | DMA_BIDIRECTIONAL); | |
c56c65fb | 1564 | |
c56c65fb TT |
1565 | rc = ib_post_recv(ia->ri_id->qp, &recv_wr, &recv_wr_fail); |
1566 | ||
1567 | if (rc) | |
1568 | dprintk("RPC: %s: ib_post_recv returned %i\n", __func__, | |
1569 | rc); | |
1570 | return rc; | |
1571 | } | |
43e95988 | 1572 | |
1c9351ee | 1573 | /* How many chunk list items fit within our inline buffers? |
43e95988 | 1574 | */ |
1c9351ee CL |
1575 | unsigned int |
1576 | rpcrdma_max_segments(struct rpcrdma_xprt *r_xprt) | |
43e95988 CL |
1577 | { |
1578 | struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data; | |
1c9351ee | 1579 | int bytes, segments; |
43e95988 | 1580 | |
1c9351ee CL |
1581 | bytes = min_t(unsigned int, cdata->inline_wsize, cdata->inline_rsize); |
1582 | bytes -= RPCRDMA_HDRLEN_MIN; | |
1583 | if (bytes < sizeof(struct rpcrdma_segment) * 2) { | |
1584 | pr_warn("RPC: %s: inline threshold too small\n", | |
1585 | __func__); | |
1586 | return 0; | |
43e95988 | 1587 | } |
1c9351ee CL |
1588 | |
1589 | segments = 1 << (fls(bytes / sizeof(struct rpcrdma_segment)) - 1); | |
1590 | dprintk("RPC: %s: max chunk list size = %d segments\n", | |
1591 | __func__, segments); | |
1592 | return segments; | |
43e95988 | 1593 | } |