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f58851e6 TT |
1 | /* |
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. | |
38 | */ | |
39 | ||
40 | /* | |
41 | * transport.c | |
42 | * | |
43 | * This file contains the top-level implementation of an RPC RDMA | |
44 | * transport. | |
45 | * | |
46 | * Naming convention: functions beginning with xprt_ are part of the | |
47 | * transport switch. All others are RPC RDMA internal. | |
48 | */ | |
49 | ||
50 | #include <linux/module.h> | |
51 | #include <linux/init.h> | |
5a0e3ad6 | 52 | #include <linux/slab.h> |
f58851e6 | 53 | #include <linux/seq_file.h> |
5976687a | 54 | #include <linux/sunrpc/addr.h> |
f58851e6 TT |
55 | |
56 | #include "xprt_rdma.h" | |
57 | ||
58 | #ifdef RPC_DEBUG | |
59 | # define RPCDBG_FACILITY RPCDBG_TRANS | |
60 | #endif | |
61 | ||
62 | MODULE_LICENSE("Dual BSD/GPL"); | |
63 | ||
64 | MODULE_DESCRIPTION("RPC/RDMA Transport for Linux kernel NFS"); | |
65 | MODULE_AUTHOR("Network Appliance, Inc."); | |
66 | ||
67 | /* | |
68 | * tunables | |
69 | */ | |
70 | ||
71 | static unsigned int xprt_rdma_slot_table_entries = RPCRDMA_DEF_SLOT_TABLE; | |
72 | static unsigned int xprt_rdma_max_inline_read = RPCRDMA_DEF_INLINE; | |
73 | static unsigned int xprt_rdma_max_inline_write = RPCRDMA_DEF_INLINE; | |
74 | static unsigned int xprt_rdma_inline_write_padding; | |
3197d309 | 75 | static unsigned int xprt_rdma_memreg_strategy = RPCRDMA_FRMR; |
9191ca3b | 76 | int xprt_rdma_pad_optimize = 0; |
f58851e6 TT |
77 | |
78 | #ifdef RPC_DEBUG | |
79 | ||
80 | static unsigned int min_slot_table_size = RPCRDMA_MIN_SLOT_TABLE; | |
81 | static unsigned int max_slot_table_size = RPCRDMA_MAX_SLOT_TABLE; | |
82 | static unsigned int zero; | |
83 | static unsigned int max_padding = PAGE_SIZE; | |
84 | static unsigned int min_memreg = RPCRDMA_BOUNCEBUFFERS; | |
85 | static unsigned int max_memreg = RPCRDMA_LAST - 1; | |
86 | ||
87 | static struct ctl_table_header *sunrpc_table_header; | |
88 | ||
fe2c6338 | 89 | static struct ctl_table xr_tunables_table[] = { |
f58851e6 | 90 | { |
f58851e6 TT |
91 | .procname = "rdma_slot_table_entries", |
92 | .data = &xprt_rdma_slot_table_entries, | |
93 | .maxlen = sizeof(unsigned int), | |
94 | .mode = 0644, | |
6d456111 | 95 | .proc_handler = proc_dointvec_minmax, |
f58851e6 TT |
96 | .extra1 = &min_slot_table_size, |
97 | .extra2 = &max_slot_table_size | |
98 | }, | |
99 | { | |
f58851e6 TT |
100 | .procname = "rdma_max_inline_read", |
101 | .data = &xprt_rdma_max_inline_read, | |
102 | .maxlen = sizeof(unsigned int), | |
103 | .mode = 0644, | |
6d456111 | 104 | .proc_handler = proc_dointvec, |
f58851e6 TT |
105 | }, |
106 | { | |
f58851e6 TT |
107 | .procname = "rdma_max_inline_write", |
108 | .data = &xprt_rdma_max_inline_write, | |
109 | .maxlen = sizeof(unsigned int), | |
110 | .mode = 0644, | |
6d456111 | 111 | .proc_handler = proc_dointvec, |
f58851e6 TT |
112 | }, |
113 | { | |
f58851e6 TT |
114 | .procname = "rdma_inline_write_padding", |
115 | .data = &xprt_rdma_inline_write_padding, | |
116 | .maxlen = sizeof(unsigned int), | |
117 | .mode = 0644, | |
6d456111 | 118 | .proc_handler = proc_dointvec_minmax, |
f58851e6 TT |
119 | .extra1 = &zero, |
120 | .extra2 = &max_padding, | |
121 | }, | |
122 | { | |
f58851e6 TT |
123 | .procname = "rdma_memreg_strategy", |
124 | .data = &xprt_rdma_memreg_strategy, | |
125 | .maxlen = sizeof(unsigned int), | |
126 | .mode = 0644, | |
6d456111 | 127 | .proc_handler = proc_dointvec_minmax, |
f58851e6 TT |
128 | .extra1 = &min_memreg, |
129 | .extra2 = &max_memreg, | |
130 | }, | |
9191ca3b | 131 | { |
9191ca3b TT |
132 | .procname = "rdma_pad_optimize", |
133 | .data = &xprt_rdma_pad_optimize, | |
134 | .maxlen = sizeof(unsigned int), | |
135 | .mode = 0644, | |
6d456111 | 136 | .proc_handler = proc_dointvec, |
9191ca3b | 137 | }, |
f8572d8f | 138 | { }, |
f58851e6 TT |
139 | }; |
140 | ||
fe2c6338 | 141 | static struct ctl_table sunrpc_table[] = { |
f58851e6 | 142 | { |
f58851e6 TT |
143 | .procname = "sunrpc", |
144 | .mode = 0555, | |
145 | .child = xr_tunables_table | |
146 | }, | |
f8572d8f | 147 | { }, |
f58851e6 TT |
148 | }; |
149 | ||
150 | #endif | |
151 | ||
bfaee096 CL |
152 | #define RPCRDMA_BIND_TO (60U * HZ) |
153 | #define RPCRDMA_INIT_REEST_TO (5U * HZ) | |
154 | #define RPCRDMA_MAX_REEST_TO (30U * HZ) | |
155 | #define RPCRDMA_IDLE_DISC_TO (5U * 60 * HZ) | |
156 | ||
f58851e6 TT |
157 | static struct rpc_xprt_ops xprt_rdma_procs; /* forward reference */ |
158 | ||
159 | static void | |
160 | xprt_rdma_format_addresses(struct rpc_xprt *xprt) | |
161 | { | |
c877b849 | 162 | struct sockaddr *sap = (struct sockaddr *) |
f58851e6 | 163 | &rpcx_to_rdmad(xprt).addr; |
c877b849 CL |
164 | struct sockaddr_in *sin = (struct sockaddr_in *)sap; |
165 | char buf[64]; | |
f58851e6 | 166 | |
c877b849 CL |
167 | (void)rpc_ntop(sap, buf, sizeof(buf)); |
168 | xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL); | |
f58851e6 | 169 | |
81160e66 | 170 | snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); |
c877b849 | 171 | xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); |
f58851e6 TT |
172 | |
173 | xprt->address_strings[RPC_DISPLAY_PROTO] = "rdma"; | |
174 | ||
81160e66 | 175 | snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); |
c877b849 CL |
176 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); |
177 | ||
81160e66 | 178 | snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); |
c877b849 | 179 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); |
f58851e6 | 180 | |
f58851e6 TT |
181 | /* netid */ |
182 | xprt->address_strings[RPC_DISPLAY_NETID] = "rdma"; | |
183 | } | |
184 | ||
185 | static void | |
186 | xprt_rdma_free_addresses(struct rpc_xprt *xprt) | |
187 | { | |
33e01dc7 CL |
188 | unsigned int i; |
189 | ||
190 | for (i = 0; i < RPC_DISPLAY_MAX; i++) | |
191 | switch (i) { | |
192 | case RPC_DISPLAY_PROTO: | |
193 | case RPC_DISPLAY_NETID: | |
194 | continue; | |
195 | default: | |
196 | kfree(xprt->address_strings[i]); | |
197 | } | |
f58851e6 TT |
198 | } |
199 | ||
200 | static void | |
201 | xprt_rdma_connect_worker(struct work_struct *work) | |
202 | { | |
203 | struct rpcrdma_xprt *r_xprt = | |
204 | container_of(work, struct rpcrdma_xprt, rdma_connect.work); | |
205 | struct rpc_xprt *xprt = &r_xprt->xprt; | |
206 | int rc = 0; | |
207 | ||
d19751e7 TM |
208 | xprt_clear_connected(xprt); |
209 | ||
210 | dprintk("RPC: %s: %sconnect\n", __func__, | |
211 | r_xprt->rx_ep.rep_connected != 0 ? "re" : ""); | |
212 | rc = rpcrdma_ep_connect(&r_xprt->rx_ep, &r_xprt->rx_ia); | |
213 | if (rc) | |
214 | xprt_wake_pending_tasks(xprt, rc); | |
215 | ||
f58851e6 TT |
216 | dprintk("RPC: %s: exit\n", __func__); |
217 | xprt_clear_connecting(xprt); | |
218 | } | |
219 | ||
220 | /* | |
221 | * xprt_rdma_destroy | |
222 | * | |
223 | * Destroy the xprt. | |
224 | * Free all memory associated with the object, including its own. | |
225 | * NOTE: none of the *destroy methods free memory for their top-level | |
226 | * objects, even though they may have allocated it (they do free | |
227 | * private memory). It's up to the caller to handle it. In this | |
228 | * case (RDMA transport), all structure memory is inlined with the | |
229 | * struct rpcrdma_xprt. | |
230 | */ | |
231 | static void | |
232 | xprt_rdma_destroy(struct rpc_xprt *xprt) | |
233 | { | |
234 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); | |
f58851e6 TT |
235 | |
236 | dprintk("RPC: %s: called\n", __func__); | |
237 | ||
a25e758c | 238 | cancel_delayed_work_sync(&r_xprt->rdma_connect); |
f58851e6 TT |
239 | |
240 | xprt_clear_connected(xprt); | |
241 | ||
242 | rpcrdma_buffer_destroy(&r_xprt->rx_buf); | |
7f1d5419 | 243 | rpcrdma_ep_destroy(&r_xprt->rx_ep, &r_xprt->rx_ia); |
f58851e6 TT |
244 | rpcrdma_ia_close(&r_xprt->rx_ia); |
245 | ||
246 | xprt_rdma_free_addresses(xprt); | |
247 | ||
e204e621 | 248 | xprt_free(xprt); |
f58851e6 TT |
249 | |
250 | dprintk("RPC: %s: returning\n", __func__); | |
251 | ||
252 | module_put(THIS_MODULE); | |
253 | } | |
254 | ||
2881ae74 TM |
255 | static const struct rpc_timeout xprt_rdma_default_timeout = { |
256 | .to_initval = 60 * HZ, | |
257 | .to_maxval = 60 * HZ, | |
258 | }; | |
259 | ||
f58851e6 TT |
260 | /** |
261 | * xprt_setup_rdma - Set up transport to use RDMA | |
262 | * | |
263 | * @args: rpc transport arguments | |
264 | */ | |
265 | static struct rpc_xprt * | |
266 | xprt_setup_rdma(struct xprt_create *args) | |
267 | { | |
268 | struct rpcrdma_create_data_internal cdata; | |
269 | struct rpc_xprt *xprt; | |
270 | struct rpcrdma_xprt *new_xprt; | |
271 | struct rpcrdma_ep *new_ep; | |
272 | struct sockaddr_in *sin; | |
273 | int rc; | |
274 | ||
275 | if (args->addrlen > sizeof(xprt->addr)) { | |
276 | dprintk("RPC: %s: address too large\n", __func__); | |
277 | return ERR_PTR(-EBADF); | |
278 | } | |
279 | ||
37aa2133 | 280 | xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt), |
d9ba131d | 281 | xprt_rdma_slot_table_entries, |
bd1722d4 | 282 | xprt_rdma_slot_table_entries); |
f58851e6 TT |
283 | if (xprt == NULL) { |
284 | dprintk("RPC: %s: couldn't allocate rpcrdma_xprt\n", | |
285 | __func__); | |
286 | return ERR_PTR(-ENOMEM); | |
287 | } | |
288 | ||
f58851e6 | 289 | /* 60 second timeout, no retries */ |
ba7392bb | 290 | xprt->timeout = &xprt_rdma_default_timeout; |
bfaee096 CL |
291 | xprt->bind_timeout = RPCRDMA_BIND_TO; |
292 | xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO; | |
293 | xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO; | |
f58851e6 TT |
294 | |
295 | xprt->resvport = 0; /* privileged port not needed */ | |
296 | xprt->tsh_size = 0; /* RPC-RDMA handles framing */ | |
f58851e6 TT |
297 | xprt->ops = &xprt_rdma_procs; |
298 | ||
299 | /* | |
300 | * Set up RDMA-specific connect data. | |
301 | */ | |
302 | ||
303 | /* Put server RDMA address in local cdata */ | |
304 | memcpy(&cdata.addr, args->dstaddr, args->addrlen); | |
305 | ||
306 | /* Ensure xprt->addr holds valid server TCP (not RDMA) | |
307 | * address, for any side protocols which peek at it */ | |
308 | xprt->prot = IPPROTO_TCP; | |
309 | xprt->addrlen = args->addrlen; | |
310 | memcpy(&xprt->addr, &cdata.addr, xprt->addrlen); | |
311 | ||
312 | sin = (struct sockaddr_in *)&cdata.addr; | |
313 | if (ntohs(sin->sin_port) != 0) | |
314 | xprt_set_bound(xprt); | |
315 | ||
21454aaa HH |
316 | dprintk("RPC: %s: %pI4:%u\n", |
317 | __func__, &sin->sin_addr.s_addr, ntohs(sin->sin_port)); | |
f58851e6 TT |
318 | |
319 | /* Set max requests */ | |
320 | cdata.max_requests = xprt->max_reqs; | |
321 | ||
322 | /* Set some length limits */ | |
323 | cdata.rsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA write max */ | |
324 | cdata.wsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA read max */ | |
325 | ||
326 | cdata.inline_wsize = xprt_rdma_max_inline_write; | |
327 | if (cdata.inline_wsize > cdata.wsize) | |
328 | cdata.inline_wsize = cdata.wsize; | |
329 | ||
330 | cdata.inline_rsize = xprt_rdma_max_inline_read; | |
331 | if (cdata.inline_rsize > cdata.rsize) | |
332 | cdata.inline_rsize = cdata.rsize; | |
333 | ||
334 | cdata.padding = xprt_rdma_inline_write_padding; | |
335 | ||
336 | /* | |
337 | * Create new transport instance, which includes initialized | |
338 | * o ia | |
339 | * o endpoint | |
340 | * o buffers | |
341 | */ | |
342 | ||
343 | new_xprt = rpcx_to_rdmax(xprt); | |
344 | ||
345 | rc = rpcrdma_ia_open(new_xprt, (struct sockaddr *) &cdata.addr, | |
346 | xprt_rdma_memreg_strategy); | |
347 | if (rc) | |
348 | goto out1; | |
349 | ||
350 | /* | |
351 | * initialize and create ep | |
352 | */ | |
353 | new_xprt->rx_data = cdata; | |
354 | new_ep = &new_xprt->rx_ep; | |
355 | new_ep->rep_remote_addr = cdata.addr; | |
356 | ||
357 | rc = rpcrdma_ep_create(&new_xprt->rx_ep, | |
358 | &new_xprt->rx_ia, &new_xprt->rx_data); | |
359 | if (rc) | |
360 | goto out2; | |
361 | ||
362 | /* | |
363 | * Allocate pre-registered send and receive buffers for headers and | |
364 | * any inline data. Also specify any padding which will be provided | |
365 | * from a preregistered zero buffer. | |
366 | */ | |
367 | rc = rpcrdma_buffer_create(&new_xprt->rx_buf, new_ep, &new_xprt->rx_ia, | |
368 | &new_xprt->rx_data); | |
369 | if (rc) | |
370 | goto out3; | |
371 | ||
372 | /* | |
373 | * Register a callback for connection events. This is necessary because | |
374 | * connection loss notification is async. We also catch connection loss | |
375 | * when reaping receives. | |
376 | */ | |
377 | INIT_DELAYED_WORK(&new_xprt->rdma_connect, xprt_rdma_connect_worker); | |
378 | new_ep->rep_func = rpcrdma_conn_func; | |
379 | new_ep->rep_xprt = xprt; | |
380 | ||
381 | xprt_rdma_format_addresses(xprt); | |
43e95988 CL |
382 | xprt->max_payload = rpcrdma_max_payload(new_xprt); |
383 | dprintk("RPC: %s: transport data payload maximum: %zu bytes\n", | |
384 | __func__, xprt->max_payload); | |
f58851e6 TT |
385 | |
386 | if (!try_module_get(THIS_MODULE)) | |
387 | goto out4; | |
388 | ||
389 | return xprt; | |
390 | ||
391 | out4: | |
392 | xprt_rdma_free_addresses(xprt); | |
393 | rc = -EINVAL; | |
394 | out3: | |
7f1d5419 | 395 | rpcrdma_ep_destroy(new_ep, &new_xprt->rx_ia); |
f58851e6 TT |
396 | out2: |
397 | rpcrdma_ia_close(&new_xprt->rx_ia); | |
398 | out1: | |
e204e621 | 399 | xprt_free(xprt); |
f58851e6 TT |
400 | return ERR_PTR(rc); |
401 | } | |
402 | ||
403 | /* | |
404 | * Close a connection, during shutdown or timeout/reconnect | |
405 | */ | |
406 | static void | |
407 | xprt_rdma_close(struct rpc_xprt *xprt) | |
408 | { | |
409 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); | |
410 | ||
411 | dprintk("RPC: %s: closing\n", __func__); | |
08ca0dce TT |
412 | if (r_xprt->rx_ep.rep_connected > 0) |
413 | xprt->reestablish_timeout = 0; | |
62da3b24 | 414 | xprt_disconnect_done(xprt); |
282191cb | 415 | rpcrdma_ep_disconnect(&r_xprt->rx_ep, &r_xprt->rx_ia); |
f58851e6 TT |
416 | } |
417 | ||
418 | static void | |
419 | xprt_rdma_set_port(struct rpc_xprt *xprt, u16 port) | |
420 | { | |
421 | struct sockaddr_in *sap; | |
422 | ||
423 | sap = (struct sockaddr_in *)&xprt->addr; | |
424 | sap->sin_port = htons(port); | |
425 | sap = (struct sockaddr_in *)&rpcx_to_rdmad(xprt).addr; | |
426 | sap->sin_port = htons(port); | |
427 | dprintk("RPC: %s: %u\n", __func__, port); | |
428 | } | |
429 | ||
430 | static void | |
1b092092 | 431 | xprt_rdma_connect(struct rpc_xprt *xprt, struct rpc_task *task) |
f58851e6 | 432 | { |
f58851e6 TT |
433 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); |
434 | ||
0b9e7943 TM |
435 | if (r_xprt->rx_ep.rep_connected != 0) { |
436 | /* Reconnect */ | |
437 | schedule_delayed_work(&r_xprt->rdma_connect, | |
438 | xprt->reestablish_timeout); | |
439 | xprt->reestablish_timeout <<= 1; | |
bfaee096 CL |
440 | if (xprt->reestablish_timeout > RPCRDMA_MAX_REEST_TO) |
441 | xprt->reestablish_timeout = RPCRDMA_MAX_REEST_TO; | |
442 | else if (xprt->reestablish_timeout < RPCRDMA_INIT_REEST_TO) | |
443 | xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO; | |
0b9e7943 TM |
444 | } else { |
445 | schedule_delayed_work(&r_xprt->rdma_connect, 0); | |
446 | if (!RPC_IS_ASYNC(task)) | |
a25e758c | 447 | flush_delayed_work(&r_xprt->rdma_connect); |
f58851e6 TT |
448 | } |
449 | } | |
450 | ||
f58851e6 TT |
451 | /* |
452 | * The RDMA allocate/free functions need the task structure as a place | |
453 | * to hide the struct rpcrdma_req, which is necessary for the actual send/recv | |
454 | * sequence. For this reason, the recv buffers are attached to send | |
455 | * buffers for portions of the RPC. Note that the RPC layer allocates | |
456 | * both send and receive buffers in the same call. We may register | |
457 | * the receive buffer portion when using reply chunks. | |
458 | */ | |
459 | static void * | |
460 | xprt_rdma_allocate(struct rpc_task *task, size_t size) | |
461 | { | |
a4f0835c | 462 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
f58851e6 TT |
463 | struct rpcrdma_req *req, *nreq; |
464 | ||
465 | req = rpcrdma_buffer_get(&rpcx_to_rdmax(xprt)->rx_buf); | |
c977dea2 CL |
466 | if (req == NULL) |
467 | return NULL; | |
f58851e6 TT |
468 | |
469 | if (size > req->rl_size) { | |
470 | dprintk("RPC: %s: size %zd too large for buffer[%zd]: " | |
471 | "prog %d vers %d proc %d\n", | |
472 | __func__, size, req->rl_size, | |
473 | task->tk_client->cl_prog, task->tk_client->cl_vers, | |
474 | task->tk_msg.rpc_proc->p_proc); | |
475 | /* | |
476 | * Outgoing length shortage. Our inline write max must have | |
477 | * been configured to perform direct i/o. | |
478 | * | |
479 | * This is therefore a large metadata operation, and the | |
480 | * allocate call was made on the maximum possible message, | |
481 | * e.g. containing long filename(s) or symlink data. In | |
482 | * fact, while these metadata operations *might* carry | |
483 | * large outgoing payloads, they rarely *do*. However, we | |
484 | * have to commit to the request here, so reallocate and | |
485 | * register it now. The data path will never require this | |
486 | * reallocation. | |
487 | * | |
488 | * If the allocation or registration fails, the RPC framework | |
489 | * will (doggedly) retry. | |
490 | */ | |
f58851e6 TT |
491 | if (task->tk_flags & RPC_TASK_SWAPPER) |
492 | nreq = kmalloc(sizeof *req + size, GFP_ATOMIC); | |
493 | else | |
494 | nreq = kmalloc(sizeof *req + size, GFP_NOFS); | |
495 | if (nreq == NULL) | |
496 | goto outfail; | |
497 | ||
498 | if (rpcrdma_register_internal(&rpcx_to_rdmax(xprt)->rx_ia, | |
499 | nreq->rl_base, size + sizeof(struct rpcrdma_req) | |
500 | - offsetof(struct rpcrdma_req, rl_base), | |
501 | &nreq->rl_handle, &nreq->rl_iov)) { | |
502 | kfree(nreq); | |
503 | goto outfail; | |
504 | } | |
505 | rpcx_to_rdmax(xprt)->rx_stats.hardway_register_count += size; | |
506 | nreq->rl_size = size; | |
507 | nreq->rl_niovs = 0; | |
508 | nreq->rl_nchunks = 0; | |
509 | nreq->rl_buffer = (struct rpcrdma_buffer *)req; | |
510 | nreq->rl_reply = req->rl_reply; | |
511 | memcpy(nreq->rl_segments, | |
512 | req->rl_segments, sizeof nreq->rl_segments); | |
513 | /* flag the swap with an unused field */ | |
514 | nreq->rl_iov.length = 0; | |
515 | req->rl_reply = NULL; | |
516 | req = nreq; | |
517 | } | |
518 | dprintk("RPC: %s: size %zd, request 0x%p\n", __func__, size, req); | |
575448bd | 519 | req->rl_connect_cookie = 0; /* our reserved value */ |
f58851e6 TT |
520 | return req->rl_xdr_buf; |
521 | ||
522 | outfail: | |
523 | rpcrdma_buffer_put(req); | |
524 | rpcx_to_rdmax(xprt)->rx_stats.failed_marshal_count++; | |
525 | return NULL; | |
526 | } | |
527 | ||
528 | /* | |
529 | * This function returns all RDMA resources to the pool. | |
530 | */ | |
531 | static void | |
532 | xprt_rdma_free(void *buffer) | |
533 | { | |
534 | struct rpcrdma_req *req; | |
535 | struct rpcrdma_xprt *r_xprt; | |
536 | struct rpcrdma_rep *rep; | |
537 | int i; | |
538 | ||
539 | if (buffer == NULL) | |
540 | return; | |
541 | ||
542 | req = container_of(buffer, struct rpcrdma_req, rl_xdr_buf[0]); | |
ee1a2c56 TT |
543 | if (req->rl_iov.length == 0) { /* see allocate above */ |
544 | r_xprt = container_of(((struct rpcrdma_req *) req->rl_buffer)->rl_buffer, | |
545 | struct rpcrdma_xprt, rx_buf); | |
546 | } else | |
547 | r_xprt = container_of(req->rl_buffer, struct rpcrdma_xprt, rx_buf); | |
f58851e6 TT |
548 | rep = req->rl_reply; |
549 | ||
550 | dprintk("RPC: %s: called on 0x%p%s\n", | |
551 | __func__, rep, (rep && rep->rr_func) ? " (with waiter)" : ""); | |
552 | ||
553 | /* | |
b45ccfd2 | 554 | * Finish the deregistration. The process is considered |
f58851e6 TT |
555 | * complete when the rr_func vector becomes NULL - this |
556 | * was put in place during rpcrdma_reply_handler() - the wait | |
557 | * call below will not block if the dereg is "done". If | |
558 | * interrupted, our framework will clean up. | |
559 | */ | |
560 | for (i = 0; req->rl_nchunks;) { | |
561 | --req->rl_nchunks; | |
562 | i += rpcrdma_deregister_external( | |
13c9ff8f | 563 | &req->rl_segments[i], r_xprt); |
f58851e6 TT |
564 | } |
565 | ||
f58851e6 TT |
566 | if (req->rl_iov.length == 0) { /* see allocate above */ |
567 | struct rpcrdma_req *oreq = (struct rpcrdma_req *)req->rl_buffer; | |
568 | oreq->rl_reply = req->rl_reply; | |
569 | (void) rpcrdma_deregister_internal(&r_xprt->rx_ia, | |
570 | req->rl_handle, | |
571 | &req->rl_iov); | |
572 | kfree(req); | |
573 | req = oreq; | |
574 | } | |
575 | ||
576 | /* Put back request+reply buffers */ | |
577 | rpcrdma_buffer_put(req); | |
578 | } | |
579 | ||
580 | /* | |
581 | * send_request invokes the meat of RPC RDMA. It must do the following: | |
582 | * 1. Marshal the RPC request into an RPC RDMA request, which means | |
583 | * putting a header in front of data, and creating IOVs for RDMA | |
584 | * from those in the request. | |
585 | * 2. In marshaling, detect opportunities for RDMA, and use them. | |
586 | * 3. Post a recv message to set up asynch completion, then send | |
587 | * the request (rpcrdma_ep_post). | |
588 | * 4. No partial sends are possible in the RPC-RDMA protocol (as in UDP). | |
589 | */ | |
590 | ||
591 | static int | |
592 | xprt_rdma_send_request(struct rpc_task *task) | |
593 | { | |
594 | struct rpc_rqst *rqst = task->tk_rqstp; | |
a4f0835c | 595 | struct rpc_xprt *xprt = rqst->rq_xprt; |
f58851e6 TT |
596 | struct rpcrdma_req *req = rpcr_to_rdmar(rqst); |
597 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); | |
6ab59945 | 598 | int rc = 0; |
f58851e6 | 599 | |
6ab59945 | 600 | if (req->rl_niovs == 0) |
c93c6223 | 601 | rc = rpcrdma_marshal_req(rqst); |
6ab59945 CL |
602 | else if (r_xprt->rx_ia.ri_memreg_strategy == RPCRDMA_FRMR) |
603 | rc = rpcrdma_marshal_chunks(rqst, 0); | |
604 | if (rc < 0) | |
605 | goto failed_marshal; | |
f58851e6 TT |
606 | |
607 | if (req->rl_reply == NULL) /* e.g. reconnection */ | |
608 | rpcrdma_recv_buffer_get(req); | |
609 | ||
610 | if (req->rl_reply) { | |
611 | req->rl_reply->rr_func = rpcrdma_reply_handler; | |
612 | /* this need only be done once, but... */ | |
613 | req->rl_reply->rr_xprt = xprt; | |
614 | } | |
615 | ||
575448bd TT |
616 | /* Must suppress retransmit to maintain credits */ |
617 | if (req->rl_connect_cookie == xprt->connect_cookie) | |
618 | goto drop_connection; | |
619 | req->rl_connect_cookie = xprt->connect_cookie; | |
620 | ||
621 | if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req)) | |
622 | goto drop_connection; | |
f58851e6 | 623 | |
d60dbb20 | 624 | rqst->rq_xmit_bytes_sent += rqst->rq_snd_buf.len; |
f58851e6 TT |
625 | rqst->rq_bytes_sent = 0; |
626 | return 0; | |
575448bd | 627 | |
c93c6223 CL |
628 | failed_marshal: |
629 | r_xprt->rx_stats.failed_marshal_count++; | |
630 | dprintk("RPC: %s: rpcrdma_marshal_req failed, status %i\n", | |
631 | __func__, rc); | |
632 | if (rc == -EIO) | |
633 | return -EIO; | |
575448bd TT |
634 | drop_connection: |
635 | xprt_disconnect_done(xprt); | |
636 | return -ENOTCONN; /* implies disconnect */ | |
f58851e6 TT |
637 | } |
638 | ||
639 | static void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
640 | { | |
641 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); | |
642 | long idle_time = 0; | |
643 | ||
644 | if (xprt_connected(xprt)) | |
645 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
646 | ||
647 | seq_printf(seq, | |
648 | "\txprt:\trdma %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu " | |
649 | "%lu %lu %lu %Lu %Lu %Lu %Lu %lu %lu %lu\n", | |
650 | ||
651 | 0, /* need a local port? */ | |
652 | xprt->stat.bind_count, | |
653 | xprt->stat.connect_count, | |
654 | xprt->stat.connect_time, | |
655 | idle_time, | |
656 | xprt->stat.sends, | |
657 | xprt->stat.recvs, | |
658 | xprt->stat.bad_xids, | |
659 | xprt->stat.req_u, | |
660 | xprt->stat.bklog_u, | |
661 | ||
662 | r_xprt->rx_stats.read_chunk_count, | |
663 | r_xprt->rx_stats.write_chunk_count, | |
664 | r_xprt->rx_stats.reply_chunk_count, | |
665 | r_xprt->rx_stats.total_rdma_request, | |
666 | r_xprt->rx_stats.total_rdma_reply, | |
667 | r_xprt->rx_stats.pullup_copy_count, | |
668 | r_xprt->rx_stats.fixup_copy_count, | |
669 | r_xprt->rx_stats.hardway_register_count, | |
670 | r_xprt->rx_stats.failed_marshal_count, | |
671 | r_xprt->rx_stats.bad_reply_count); | |
672 | } | |
673 | ||
674 | /* | |
675 | * Plumbing for rpc transport switch and kernel module | |
676 | */ | |
677 | ||
678 | static struct rpc_xprt_ops xprt_rdma_procs = { | |
e7ce710a | 679 | .reserve_xprt = xprt_reserve_xprt_cong, |
f58851e6 | 680 | .release_xprt = xprt_release_xprt_cong, /* sunrpc/xprt.c */ |
f39c1bfb | 681 | .alloc_slot = xprt_alloc_slot, |
f58851e6 TT |
682 | .release_request = xprt_release_rqst_cong, /* ditto */ |
683 | .set_retrans_timeout = xprt_set_retrans_timeout_def, /* ditto */ | |
684 | .rpcbind = rpcb_getport_async, /* sunrpc/rpcb_clnt.c */ | |
685 | .set_port = xprt_rdma_set_port, | |
686 | .connect = xprt_rdma_connect, | |
687 | .buf_alloc = xprt_rdma_allocate, | |
688 | .buf_free = xprt_rdma_free, | |
689 | .send_request = xprt_rdma_send_request, | |
690 | .close = xprt_rdma_close, | |
691 | .destroy = xprt_rdma_destroy, | |
692 | .print_stats = xprt_rdma_print_stats | |
693 | }; | |
694 | ||
695 | static struct xprt_class xprt_rdma = { | |
696 | .list = LIST_HEAD_INIT(xprt_rdma.list), | |
697 | .name = "rdma", | |
698 | .owner = THIS_MODULE, | |
699 | .ident = XPRT_TRANSPORT_RDMA, | |
700 | .setup = xprt_setup_rdma, | |
701 | }; | |
702 | ||
703 | static void __exit xprt_rdma_cleanup(void) | |
704 | { | |
705 | int rc; | |
706 | ||
3a0799a9 | 707 | dprintk("RPCRDMA Module Removed, deregister RPC RDMA transport\n"); |
f58851e6 TT |
708 | #ifdef RPC_DEBUG |
709 | if (sunrpc_table_header) { | |
710 | unregister_sysctl_table(sunrpc_table_header); | |
711 | sunrpc_table_header = NULL; | |
712 | } | |
713 | #endif | |
714 | rc = xprt_unregister_transport(&xprt_rdma); | |
715 | if (rc) | |
716 | dprintk("RPC: %s: xprt_unregister returned %i\n", | |
717 | __func__, rc); | |
718 | } | |
719 | ||
720 | static int __init xprt_rdma_init(void) | |
721 | { | |
722 | int rc; | |
723 | ||
724 | rc = xprt_register_transport(&xprt_rdma); | |
725 | ||
726 | if (rc) | |
727 | return rc; | |
728 | ||
3a0799a9 | 729 | dprintk("RPCRDMA Module Init, register RPC RDMA transport\n"); |
f58851e6 | 730 | |
3a0799a9 CL |
731 | dprintk("Defaults:\n"); |
732 | dprintk("\tSlots %d\n" | |
f58851e6 TT |
733 | "\tMaxInlineRead %d\n\tMaxInlineWrite %d\n", |
734 | xprt_rdma_slot_table_entries, | |
735 | xprt_rdma_max_inline_read, xprt_rdma_max_inline_write); | |
3a0799a9 | 736 | dprintk("\tPadding %d\n\tMemreg %d\n", |
f58851e6 TT |
737 | xprt_rdma_inline_write_padding, xprt_rdma_memreg_strategy); |
738 | ||
739 | #ifdef RPC_DEBUG | |
740 | if (!sunrpc_table_header) | |
741 | sunrpc_table_header = register_sysctl_table(sunrpc_table); | |
742 | #endif | |
743 | return 0; | |
744 | } | |
745 | ||
746 | module_init(xprt_rdma_init); | |
747 | module_exit(xprt_rdma_cleanup); |