Commit | Line | Data |
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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 | ||
f895b252 | 58 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
f58851e6 TT |
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; |
d5440e27 | 76 | int xprt_rdma_pad_optimize = 1; |
f58851e6 | 77 | |
f895b252 | 78 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
f58851e6 TT |
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 | ||
0dd39cae CL |
159 | static void |
160 | xprt_rdma_format_addresses4(struct rpc_xprt *xprt, struct sockaddr *sap) | |
161 | { | |
162 | struct sockaddr_in *sin = (struct sockaddr_in *)sap; | |
163 | char buf[20]; | |
164 | ||
165 | snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); | |
166 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); | |
167 | ||
168 | xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA; | |
169 | } | |
170 | ||
171 | static void | |
172 | xprt_rdma_format_addresses6(struct rpc_xprt *xprt, struct sockaddr *sap) | |
173 | { | |
174 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; | |
175 | char buf[40]; | |
176 | ||
177 | snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); | |
178 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); | |
179 | ||
180 | xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA6; | |
181 | } | |
182 | ||
f58851e6 TT |
183 | static void |
184 | xprt_rdma_format_addresses(struct rpc_xprt *xprt) | |
185 | { | |
c877b849 | 186 | struct sockaddr *sap = (struct sockaddr *) |
f58851e6 | 187 | &rpcx_to_rdmad(xprt).addr; |
0dd39cae CL |
188 | char buf[128]; |
189 | ||
190 | switch (sap->sa_family) { | |
191 | case AF_INET: | |
192 | xprt_rdma_format_addresses4(xprt, sap); | |
193 | break; | |
194 | case AF_INET6: | |
195 | xprt_rdma_format_addresses6(xprt, sap); | |
196 | break; | |
197 | default: | |
198 | pr_err("rpcrdma: Unrecognized address family\n"); | |
199 | return; | |
200 | } | |
f58851e6 | 201 | |
c877b849 CL |
202 | (void)rpc_ntop(sap, buf, sizeof(buf)); |
203 | xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL); | |
f58851e6 | 204 | |
81160e66 | 205 | snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); |
c877b849 | 206 | xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); |
f58851e6 | 207 | |
81160e66 | 208 | snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); |
c877b849 | 209 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); |
f58851e6 | 210 | |
0dd39cae | 211 | xprt->address_strings[RPC_DISPLAY_PROTO] = "rdma"; |
f58851e6 TT |
212 | } |
213 | ||
214 | static void | |
215 | xprt_rdma_free_addresses(struct rpc_xprt *xprt) | |
216 | { | |
33e01dc7 CL |
217 | unsigned int i; |
218 | ||
219 | for (i = 0; i < RPC_DISPLAY_MAX; i++) | |
220 | switch (i) { | |
221 | case RPC_DISPLAY_PROTO: | |
222 | case RPC_DISPLAY_NETID: | |
223 | continue; | |
224 | default: | |
225 | kfree(xprt->address_strings[i]); | |
226 | } | |
f58851e6 TT |
227 | } |
228 | ||
229 | static void | |
230 | xprt_rdma_connect_worker(struct work_struct *work) | |
231 | { | |
5abefb86 CL |
232 | struct rpcrdma_xprt *r_xprt = container_of(work, struct rpcrdma_xprt, |
233 | rx_connect_worker.work); | |
234 | struct rpc_xprt *xprt = &r_xprt->rx_xprt; | |
f58851e6 TT |
235 | int rc = 0; |
236 | ||
d19751e7 TM |
237 | xprt_clear_connected(xprt); |
238 | ||
239 | dprintk("RPC: %s: %sconnect\n", __func__, | |
240 | r_xprt->rx_ep.rep_connected != 0 ? "re" : ""); | |
241 | rc = rpcrdma_ep_connect(&r_xprt->rx_ep, &r_xprt->rx_ia); | |
242 | if (rc) | |
243 | xprt_wake_pending_tasks(xprt, rc); | |
244 | ||
f58851e6 TT |
245 | dprintk("RPC: %s: exit\n", __func__); |
246 | xprt_clear_connecting(xprt); | |
247 | } | |
248 | ||
249 | /* | |
250 | * xprt_rdma_destroy | |
251 | * | |
252 | * Destroy the xprt. | |
253 | * Free all memory associated with the object, including its own. | |
254 | * NOTE: none of the *destroy methods free memory for their top-level | |
255 | * objects, even though they may have allocated it (they do free | |
256 | * private memory). It's up to the caller to handle it. In this | |
257 | * case (RDMA transport), all structure memory is inlined with the | |
258 | * struct rpcrdma_xprt. | |
259 | */ | |
260 | static void | |
261 | xprt_rdma_destroy(struct rpc_xprt *xprt) | |
262 | { | |
263 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); | |
f58851e6 TT |
264 | |
265 | dprintk("RPC: %s: called\n", __func__); | |
266 | ||
5abefb86 | 267 | cancel_delayed_work_sync(&r_xprt->rx_connect_worker); |
f58851e6 TT |
268 | |
269 | xprt_clear_connected(xprt); | |
270 | ||
271 | rpcrdma_buffer_destroy(&r_xprt->rx_buf); | |
7f1d5419 | 272 | rpcrdma_ep_destroy(&r_xprt->rx_ep, &r_xprt->rx_ia); |
f58851e6 TT |
273 | rpcrdma_ia_close(&r_xprt->rx_ia); |
274 | ||
275 | xprt_rdma_free_addresses(xprt); | |
276 | ||
e204e621 | 277 | xprt_free(xprt); |
f58851e6 TT |
278 | |
279 | dprintk("RPC: %s: returning\n", __func__); | |
280 | ||
281 | module_put(THIS_MODULE); | |
282 | } | |
283 | ||
2881ae74 TM |
284 | static const struct rpc_timeout xprt_rdma_default_timeout = { |
285 | .to_initval = 60 * HZ, | |
286 | .to_maxval = 60 * HZ, | |
287 | }; | |
288 | ||
f58851e6 TT |
289 | /** |
290 | * xprt_setup_rdma - Set up transport to use RDMA | |
291 | * | |
292 | * @args: rpc transport arguments | |
293 | */ | |
294 | static struct rpc_xprt * | |
295 | xprt_setup_rdma(struct xprt_create *args) | |
296 | { | |
297 | struct rpcrdma_create_data_internal cdata; | |
298 | struct rpc_xprt *xprt; | |
299 | struct rpcrdma_xprt *new_xprt; | |
300 | struct rpcrdma_ep *new_ep; | |
301 | struct sockaddr_in *sin; | |
302 | int rc; | |
303 | ||
304 | if (args->addrlen > sizeof(xprt->addr)) { | |
305 | dprintk("RPC: %s: address too large\n", __func__); | |
306 | return ERR_PTR(-EBADF); | |
307 | } | |
308 | ||
37aa2133 | 309 | xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt), |
d9ba131d | 310 | xprt_rdma_slot_table_entries, |
bd1722d4 | 311 | xprt_rdma_slot_table_entries); |
f58851e6 TT |
312 | if (xprt == NULL) { |
313 | dprintk("RPC: %s: couldn't allocate rpcrdma_xprt\n", | |
314 | __func__); | |
315 | return ERR_PTR(-ENOMEM); | |
316 | } | |
317 | ||
f58851e6 | 318 | /* 60 second timeout, no retries */ |
ba7392bb | 319 | xprt->timeout = &xprt_rdma_default_timeout; |
bfaee096 CL |
320 | xprt->bind_timeout = RPCRDMA_BIND_TO; |
321 | xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO; | |
322 | xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO; | |
f58851e6 TT |
323 | |
324 | xprt->resvport = 0; /* privileged port not needed */ | |
325 | xprt->tsh_size = 0; /* RPC-RDMA handles framing */ | |
f58851e6 TT |
326 | xprt->ops = &xprt_rdma_procs; |
327 | ||
328 | /* | |
329 | * Set up RDMA-specific connect data. | |
330 | */ | |
331 | ||
332 | /* Put server RDMA address in local cdata */ | |
333 | memcpy(&cdata.addr, args->dstaddr, args->addrlen); | |
334 | ||
335 | /* Ensure xprt->addr holds valid server TCP (not RDMA) | |
336 | * address, for any side protocols which peek at it */ | |
337 | xprt->prot = IPPROTO_TCP; | |
338 | xprt->addrlen = args->addrlen; | |
339 | memcpy(&xprt->addr, &cdata.addr, xprt->addrlen); | |
340 | ||
341 | sin = (struct sockaddr_in *)&cdata.addr; | |
342 | if (ntohs(sin->sin_port) != 0) | |
343 | xprt_set_bound(xprt); | |
344 | ||
21454aaa HH |
345 | dprintk("RPC: %s: %pI4:%u\n", |
346 | __func__, &sin->sin_addr.s_addr, ntohs(sin->sin_port)); | |
f58851e6 TT |
347 | |
348 | /* Set max requests */ | |
349 | cdata.max_requests = xprt->max_reqs; | |
350 | ||
351 | /* Set some length limits */ | |
352 | cdata.rsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA write max */ | |
353 | cdata.wsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA read max */ | |
354 | ||
355 | cdata.inline_wsize = xprt_rdma_max_inline_write; | |
356 | if (cdata.inline_wsize > cdata.wsize) | |
357 | cdata.inline_wsize = cdata.wsize; | |
358 | ||
359 | cdata.inline_rsize = xprt_rdma_max_inline_read; | |
360 | if (cdata.inline_rsize > cdata.rsize) | |
361 | cdata.inline_rsize = cdata.rsize; | |
362 | ||
363 | cdata.padding = xprt_rdma_inline_write_padding; | |
364 | ||
365 | /* | |
366 | * Create new transport instance, which includes initialized | |
367 | * o ia | |
368 | * o endpoint | |
369 | * o buffers | |
370 | */ | |
371 | ||
372 | new_xprt = rpcx_to_rdmax(xprt); | |
373 | ||
374 | rc = rpcrdma_ia_open(new_xprt, (struct sockaddr *) &cdata.addr, | |
375 | xprt_rdma_memreg_strategy); | |
376 | if (rc) | |
377 | goto out1; | |
378 | ||
379 | /* | |
380 | * initialize and create ep | |
381 | */ | |
382 | new_xprt->rx_data = cdata; | |
383 | new_ep = &new_xprt->rx_ep; | |
384 | new_ep->rep_remote_addr = cdata.addr; | |
385 | ||
386 | rc = rpcrdma_ep_create(&new_xprt->rx_ep, | |
387 | &new_xprt->rx_ia, &new_xprt->rx_data); | |
388 | if (rc) | |
389 | goto out2; | |
390 | ||
391 | /* | |
392 | * Allocate pre-registered send and receive buffers for headers and | |
393 | * any inline data. Also specify any padding which will be provided | |
394 | * from a preregistered zero buffer. | |
395 | */ | |
ac920d04 | 396 | rc = rpcrdma_buffer_create(new_xprt); |
f58851e6 TT |
397 | if (rc) |
398 | goto out3; | |
399 | ||
400 | /* | |
401 | * Register a callback for connection events. This is necessary because | |
402 | * connection loss notification is async. We also catch connection loss | |
403 | * when reaping receives. | |
404 | */ | |
5abefb86 CL |
405 | INIT_DELAYED_WORK(&new_xprt->rx_connect_worker, |
406 | xprt_rdma_connect_worker); | |
f58851e6 TT |
407 | |
408 | xprt_rdma_format_addresses(xprt); | |
1c9351ee CL |
409 | xprt->max_payload = new_xprt->rx_ia.ri_ops->ro_maxpages(new_xprt); |
410 | if (xprt->max_payload == 0) | |
411 | goto out4; | |
412 | xprt->max_payload <<= PAGE_SHIFT; | |
43e95988 CL |
413 | dprintk("RPC: %s: transport data payload maximum: %zu bytes\n", |
414 | __func__, xprt->max_payload); | |
f58851e6 TT |
415 | |
416 | if (!try_module_get(THIS_MODULE)) | |
417 | goto out4; | |
418 | ||
419 | return xprt; | |
420 | ||
421 | out4: | |
422 | xprt_rdma_free_addresses(xprt); | |
423 | rc = -EINVAL; | |
424 | out3: | |
7f1d5419 | 425 | rpcrdma_ep_destroy(new_ep, &new_xprt->rx_ia); |
f58851e6 TT |
426 | out2: |
427 | rpcrdma_ia_close(&new_xprt->rx_ia); | |
428 | out1: | |
e204e621 | 429 | xprt_free(xprt); |
f58851e6 TT |
430 | return ERR_PTR(rc); |
431 | } | |
432 | ||
433 | /* | |
434 | * Close a connection, during shutdown or timeout/reconnect | |
435 | */ | |
436 | static void | |
437 | xprt_rdma_close(struct rpc_xprt *xprt) | |
438 | { | |
439 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); | |
440 | ||
441 | dprintk("RPC: %s: closing\n", __func__); | |
08ca0dce TT |
442 | if (r_xprt->rx_ep.rep_connected > 0) |
443 | xprt->reestablish_timeout = 0; | |
62da3b24 | 444 | xprt_disconnect_done(xprt); |
282191cb | 445 | rpcrdma_ep_disconnect(&r_xprt->rx_ep, &r_xprt->rx_ia); |
f58851e6 TT |
446 | } |
447 | ||
448 | static void | |
449 | xprt_rdma_set_port(struct rpc_xprt *xprt, u16 port) | |
450 | { | |
451 | struct sockaddr_in *sap; | |
452 | ||
453 | sap = (struct sockaddr_in *)&xprt->addr; | |
454 | sap->sin_port = htons(port); | |
455 | sap = (struct sockaddr_in *)&rpcx_to_rdmad(xprt).addr; | |
456 | sap->sin_port = htons(port); | |
457 | dprintk("RPC: %s: %u\n", __func__, port); | |
458 | } | |
459 | ||
460 | static void | |
1b092092 | 461 | xprt_rdma_connect(struct rpc_xprt *xprt, struct rpc_task *task) |
f58851e6 | 462 | { |
f58851e6 TT |
463 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); |
464 | ||
0b9e7943 TM |
465 | if (r_xprt->rx_ep.rep_connected != 0) { |
466 | /* Reconnect */ | |
5abefb86 CL |
467 | schedule_delayed_work(&r_xprt->rx_connect_worker, |
468 | xprt->reestablish_timeout); | |
0b9e7943 | 469 | xprt->reestablish_timeout <<= 1; |
bfaee096 CL |
470 | if (xprt->reestablish_timeout > RPCRDMA_MAX_REEST_TO) |
471 | xprt->reestablish_timeout = RPCRDMA_MAX_REEST_TO; | |
472 | else if (xprt->reestablish_timeout < RPCRDMA_INIT_REEST_TO) | |
473 | xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO; | |
0b9e7943 | 474 | } else { |
5abefb86 | 475 | schedule_delayed_work(&r_xprt->rx_connect_worker, 0); |
0b9e7943 | 476 | if (!RPC_IS_ASYNC(task)) |
5abefb86 | 477 | flush_delayed_work(&r_xprt->rx_connect_worker); |
f58851e6 TT |
478 | } |
479 | } | |
480 | ||
f58851e6 TT |
481 | /* |
482 | * The RDMA allocate/free functions need the task structure as a place | |
483 | * to hide the struct rpcrdma_req, which is necessary for the actual send/recv | |
0ca77dc3 CL |
484 | * sequence. |
485 | * | |
486 | * The RPC layer allocates both send and receive buffers in the same call | |
487 | * (rq_send_buf and rq_rcv_buf are both part of a single contiguous buffer). | |
488 | * We may register rq_rcv_buf when using reply chunks. | |
f58851e6 TT |
489 | */ |
490 | static void * | |
491 | xprt_rdma_allocate(struct rpc_task *task, size_t size) | |
492 | { | |
a4f0835c | 493 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
0ca77dc3 CL |
494 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); |
495 | struct rpcrdma_regbuf *rb; | |
496 | struct rpcrdma_req *req; | |
497 | size_t min_size; | |
a0a1d50c | 498 | gfp_t flags; |
f58851e6 | 499 | |
0ca77dc3 | 500 | req = rpcrdma_buffer_get(&r_xprt->rx_buf); |
c977dea2 CL |
501 | if (req == NULL) |
502 | return NULL; | |
f58851e6 | 503 | |
a0a1d50c CL |
504 | flags = GFP_NOIO | __GFP_NOWARN; |
505 | if (RPC_IS_SWAPPER(task)) | |
506 | flags = __GFP_MEMALLOC | GFP_NOWAIT | __GFP_NOWARN; | |
507 | ||
85275c87 CL |
508 | if (req->rl_rdmabuf == NULL) |
509 | goto out_rdmabuf; | |
0ca77dc3 CL |
510 | if (req->rl_sendbuf == NULL) |
511 | goto out_sendbuf; | |
512 | if (size > req->rl_sendbuf->rg_size) | |
513 | goto out_sendbuf; | |
514 | ||
515 | out: | |
f58851e6 | 516 | dprintk("RPC: %s: size %zd, request 0x%p\n", __func__, size, req); |
575448bd | 517 | req->rl_connect_cookie = 0; /* our reserved value */ |
0ca77dc3 CL |
518 | return req->rl_sendbuf->rg_base; |
519 | ||
85275c87 CL |
520 | out_rdmabuf: |
521 | min_size = RPCRDMA_INLINE_WRITE_THRESHOLD(task->tk_rqstp); | |
522 | rb = rpcrdma_alloc_regbuf(&r_xprt->rx_ia, min_size, flags); | |
523 | if (IS_ERR(rb)) | |
524 | goto out_fail; | |
525 | req->rl_rdmabuf = rb; | |
526 | ||
0ca77dc3 CL |
527 | out_sendbuf: |
528 | /* XDR encoding and RPC/RDMA marshaling of this request has not | |
529 | * yet occurred. Thus a lower bound is needed to prevent buffer | |
530 | * overrun during marshaling. | |
531 | * | |
532 | * RPC/RDMA marshaling may choose to send payload bearing ops | |
533 | * inline, if the result is smaller than the inline threshold. | |
534 | * The value of the "size" argument accounts for header | |
535 | * requirements but not for the payload in these cases. | |
536 | * | |
537 | * Likewise, allocate enough space to receive a reply up to the | |
538 | * size of the inline threshold. | |
539 | * | |
540 | * It's unlikely that both the send header and the received | |
541 | * reply will be large, but slush is provided here to allow | |
542 | * flexibility when marshaling. | |
543 | */ | |
544 | min_size = RPCRDMA_INLINE_READ_THRESHOLD(task->tk_rqstp); | |
545 | min_size += RPCRDMA_INLINE_WRITE_THRESHOLD(task->tk_rqstp); | |
546 | if (size < min_size) | |
547 | size = min_size; | |
548 | ||
549 | rb = rpcrdma_alloc_regbuf(&r_xprt->rx_ia, size, flags); | |
550 | if (IS_ERR(rb)) | |
551 | goto out_fail; | |
552 | rb->rg_owner = req; | |
553 | ||
554 | r_xprt->rx_stats.hardway_register_count += size; | |
555 | rpcrdma_free_regbuf(&r_xprt->rx_ia, req->rl_sendbuf); | |
556 | req->rl_sendbuf = rb; | |
557 | goto out; | |
558 | ||
559 | out_fail: | |
f58851e6 | 560 | rpcrdma_buffer_put(req); |
0ca77dc3 | 561 | r_xprt->rx_stats.failed_marshal_count++; |
f58851e6 TT |
562 | return NULL; |
563 | } | |
564 | ||
565 | /* | |
566 | * This function returns all RDMA resources to the pool. | |
567 | */ | |
568 | static void | |
569 | xprt_rdma_free(void *buffer) | |
570 | { | |
571 | struct rpcrdma_req *req; | |
572 | struct rpcrdma_xprt *r_xprt; | |
0ca77dc3 | 573 | struct rpcrdma_regbuf *rb; |
f58851e6 TT |
574 | int i; |
575 | ||
576 | if (buffer == NULL) | |
577 | return; | |
578 | ||
0ca77dc3 CL |
579 | rb = container_of(buffer, struct rpcrdma_regbuf, rg_base[0]); |
580 | req = rb->rg_owner; | |
581 | r_xprt = container_of(req->rl_buffer, struct rpcrdma_xprt, rx_buf); | |
f58851e6 | 582 | |
0ca77dc3 | 583 | dprintk("RPC: %s: called on 0x%p\n", __func__, req->rl_reply); |
f58851e6 | 584 | |
f58851e6 TT |
585 | for (i = 0; req->rl_nchunks;) { |
586 | --req->rl_nchunks; | |
6814baea CL |
587 | i += r_xprt->rx_ia.ri_ops->ro_unmap(r_xprt, |
588 | &req->rl_segments[i]); | |
f58851e6 TT |
589 | } |
590 | ||
f58851e6 TT |
591 | rpcrdma_buffer_put(req); |
592 | } | |
593 | ||
594 | /* | |
595 | * send_request invokes the meat of RPC RDMA. It must do the following: | |
596 | * 1. Marshal the RPC request into an RPC RDMA request, which means | |
597 | * putting a header in front of data, and creating IOVs for RDMA | |
598 | * from those in the request. | |
599 | * 2. In marshaling, detect opportunities for RDMA, and use them. | |
600 | * 3. Post a recv message to set up asynch completion, then send | |
601 | * the request (rpcrdma_ep_post). | |
602 | * 4. No partial sends are possible in the RPC-RDMA protocol (as in UDP). | |
603 | */ | |
604 | ||
605 | static int | |
606 | xprt_rdma_send_request(struct rpc_task *task) | |
607 | { | |
608 | struct rpc_rqst *rqst = task->tk_rqstp; | |
a4f0835c | 609 | struct rpc_xprt *xprt = rqst->rq_xprt; |
f58851e6 TT |
610 | struct rpcrdma_req *req = rpcr_to_rdmar(rqst); |
611 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); | |
6ab59945 | 612 | int rc = 0; |
f58851e6 | 613 | |
e2377945 | 614 | rc = rpcrdma_marshal_req(rqst); |
6ab59945 CL |
615 | if (rc < 0) |
616 | goto failed_marshal; | |
f58851e6 TT |
617 | |
618 | if (req->rl_reply == NULL) /* e.g. reconnection */ | |
619 | rpcrdma_recv_buffer_get(req); | |
f58851e6 | 620 | |
575448bd TT |
621 | /* Must suppress retransmit to maintain credits */ |
622 | if (req->rl_connect_cookie == xprt->connect_cookie) | |
623 | goto drop_connection; | |
624 | req->rl_connect_cookie = xprt->connect_cookie; | |
625 | ||
626 | if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req)) | |
627 | goto drop_connection; | |
f58851e6 | 628 | |
d60dbb20 | 629 | rqst->rq_xmit_bytes_sent += rqst->rq_snd_buf.len; |
f58851e6 TT |
630 | rqst->rq_bytes_sent = 0; |
631 | return 0; | |
575448bd | 632 | |
c93c6223 CL |
633 | failed_marshal: |
634 | r_xprt->rx_stats.failed_marshal_count++; | |
635 | dprintk("RPC: %s: rpcrdma_marshal_req failed, status %i\n", | |
636 | __func__, rc); | |
637 | if (rc == -EIO) | |
638 | return -EIO; | |
575448bd TT |
639 | drop_connection: |
640 | xprt_disconnect_done(xprt); | |
641 | return -ENOTCONN; /* implies disconnect */ | |
f58851e6 TT |
642 | } |
643 | ||
644 | static void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
645 | { | |
646 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); | |
647 | long idle_time = 0; | |
648 | ||
649 | if (xprt_connected(xprt)) | |
650 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
651 | ||
652 | seq_printf(seq, | |
653 | "\txprt:\trdma %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu " | |
654 | "%lu %lu %lu %Lu %Lu %Lu %Lu %lu %lu %lu\n", | |
655 | ||
656 | 0, /* need a local port? */ | |
657 | xprt->stat.bind_count, | |
658 | xprt->stat.connect_count, | |
659 | xprt->stat.connect_time, | |
660 | idle_time, | |
661 | xprt->stat.sends, | |
662 | xprt->stat.recvs, | |
663 | xprt->stat.bad_xids, | |
664 | xprt->stat.req_u, | |
665 | xprt->stat.bklog_u, | |
666 | ||
667 | r_xprt->rx_stats.read_chunk_count, | |
668 | r_xprt->rx_stats.write_chunk_count, | |
669 | r_xprt->rx_stats.reply_chunk_count, | |
670 | r_xprt->rx_stats.total_rdma_request, | |
671 | r_xprt->rx_stats.total_rdma_reply, | |
672 | r_xprt->rx_stats.pullup_copy_count, | |
673 | r_xprt->rx_stats.fixup_copy_count, | |
674 | r_xprt->rx_stats.hardway_register_count, | |
675 | r_xprt->rx_stats.failed_marshal_count, | |
676 | r_xprt->rx_stats.bad_reply_count); | |
677 | } | |
678 | ||
679 | /* | |
680 | * Plumbing for rpc transport switch and kernel module | |
681 | */ | |
682 | ||
683 | static struct rpc_xprt_ops xprt_rdma_procs = { | |
e7ce710a | 684 | .reserve_xprt = xprt_reserve_xprt_cong, |
f58851e6 | 685 | .release_xprt = xprt_release_xprt_cong, /* sunrpc/xprt.c */ |
f39c1bfb | 686 | .alloc_slot = xprt_alloc_slot, |
f58851e6 TT |
687 | .release_request = xprt_release_rqst_cong, /* ditto */ |
688 | .set_retrans_timeout = xprt_set_retrans_timeout_def, /* ditto */ | |
689 | .rpcbind = rpcb_getport_async, /* sunrpc/rpcb_clnt.c */ | |
690 | .set_port = xprt_rdma_set_port, | |
691 | .connect = xprt_rdma_connect, | |
692 | .buf_alloc = xprt_rdma_allocate, | |
693 | .buf_free = xprt_rdma_free, | |
694 | .send_request = xprt_rdma_send_request, | |
695 | .close = xprt_rdma_close, | |
696 | .destroy = xprt_rdma_destroy, | |
697 | .print_stats = xprt_rdma_print_stats | |
698 | }; | |
699 | ||
700 | static struct xprt_class xprt_rdma = { | |
701 | .list = LIST_HEAD_INIT(xprt_rdma.list), | |
702 | .name = "rdma", | |
703 | .owner = THIS_MODULE, | |
704 | .ident = XPRT_TRANSPORT_RDMA, | |
705 | .setup = xprt_setup_rdma, | |
706 | }; | |
707 | ||
708 | static void __exit xprt_rdma_cleanup(void) | |
709 | { | |
710 | int rc; | |
711 | ||
3a0799a9 | 712 | dprintk("RPCRDMA Module Removed, deregister RPC RDMA transport\n"); |
f895b252 | 713 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
f58851e6 TT |
714 | if (sunrpc_table_header) { |
715 | unregister_sysctl_table(sunrpc_table_header); | |
716 | sunrpc_table_header = NULL; | |
717 | } | |
718 | #endif | |
719 | rc = xprt_unregister_transport(&xprt_rdma); | |
720 | if (rc) | |
721 | dprintk("RPC: %s: xprt_unregister returned %i\n", | |
722 | __func__, rc); | |
723 | } | |
724 | ||
725 | static int __init xprt_rdma_init(void) | |
726 | { | |
727 | int rc; | |
728 | ||
729 | rc = xprt_register_transport(&xprt_rdma); | |
730 | ||
731 | if (rc) | |
732 | return rc; | |
733 | ||
3a0799a9 | 734 | dprintk("RPCRDMA Module Init, register RPC RDMA transport\n"); |
f58851e6 | 735 | |
3a0799a9 CL |
736 | dprintk("Defaults:\n"); |
737 | dprintk("\tSlots %d\n" | |
f58851e6 TT |
738 | "\tMaxInlineRead %d\n\tMaxInlineWrite %d\n", |
739 | xprt_rdma_slot_table_entries, | |
740 | xprt_rdma_max_inline_read, xprt_rdma_max_inline_write); | |
3a0799a9 | 741 | dprintk("\tPadding %d\n\tMemreg %d\n", |
f58851e6 TT |
742 | xprt_rdma_inline_write_padding, xprt_rdma_memreg_strategy); |
743 | ||
f895b252 | 744 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
f58851e6 TT |
745 | if (!sunrpc_table_header) |
746 | sunrpc_table_header = register_sysctl_table(sunrpc_table); | |
747 | #endif | |
748 | return 0; | |
749 | } | |
750 | ||
751 | module_init(xprt_rdma_init); | |
752 | module_exit(xprt_rdma_cleanup); |