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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> | |
5a0e3ad6 | 51 | #include <linux/slab.h> |
f58851e6 | 52 | #include <linux/seq_file.h> |
5976687a | 53 | #include <linux/sunrpc/addr.h> |
f58851e6 TT |
54 | |
55 | #include "xprt_rdma.h" | |
56 | ||
f895b252 | 57 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
f58851e6 TT |
58 | # define RPCDBG_FACILITY RPCDBG_TRANS |
59 | #endif | |
60 | ||
f58851e6 TT |
61 | /* |
62 | * tunables | |
63 | */ | |
64 | ||
65 | static unsigned int xprt_rdma_slot_table_entries = RPCRDMA_DEF_SLOT_TABLE; | |
5d252f90 | 66 | unsigned int xprt_rdma_max_inline_read = RPCRDMA_DEF_INLINE; |
f58851e6 TT |
67 | static unsigned int xprt_rdma_max_inline_write = RPCRDMA_DEF_INLINE; |
68 | static unsigned int xprt_rdma_inline_write_padding; | |
3197d309 | 69 | static unsigned int xprt_rdma_memreg_strategy = RPCRDMA_FRMR; |
d5440e27 | 70 | int xprt_rdma_pad_optimize = 1; |
f58851e6 | 71 | |
f895b252 | 72 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
f58851e6 TT |
73 | |
74 | static unsigned int min_slot_table_size = RPCRDMA_MIN_SLOT_TABLE; | |
75 | static unsigned int max_slot_table_size = RPCRDMA_MAX_SLOT_TABLE; | |
29c55422 CL |
76 | static unsigned int min_inline_size = RPCRDMA_MIN_INLINE; |
77 | static unsigned int max_inline_size = RPCRDMA_MAX_INLINE; | |
f58851e6 TT |
78 | static unsigned int zero; |
79 | static unsigned int max_padding = PAGE_SIZE; | |
80 | static unsigned int min_memreg = RPCRDMA_BOUNCEBUFFERS; | |
81 | static unsigned int max_memreg = RPCRDMA_LAST - 1; | |
82 | ||
83 | static struct ctl_table_header *sunrpc_table_header; | |
84 | ||
fe2c6338 | 85 | static struct ctl_table xr_tunables_table[] = { |
f58851e6 | 86 | { |
f58851e6 TT |
87 | .procname = "rdma_slot_table_entries", |
88 | .data = &xprt_rdma_slot_table_entries, | |
89 | .maxlen = sizeof(unsigned int), | |
90 | .mode = 0644, | |
6d456111 | 91 | .proc_handler = proc_dointvec_minmax, |
f58851e6 TT |
92 | .extra1 = &min_slot_table_size, |
93 | .extra2 = &max_slot_table_size | |
94 | }, | |
95 | { | |
f58851e6 TT |
96 | .procname = "rdma_max_inline_read", |
97 | .data = &xprt_rdma_max_inline_read, | |
98 | .maxlen = sizeof(unsigned int), | |
99 | .mode = 0644, | |
44829d02 | 100 | .proc_handler = proc_dointvec_minmax, |
29c55422 CL |
101 | .extra1 = &min_inline_size, |
102 | .extra2 = &max_inline_size, | |
f58851e6 TT |
103 | }, |
104 | { | |
f58851e6 TT |
105 | .procname = "rdma_max_inline_write", |
106 | .data = &xprt_rdma_max_inline_write, | |
107 | .maxlen = sizeof(unsigned int), | |
108 | .mode = 0644, | |
44829d02 | 109 | .proc_handler = proc_dointvec_minmax, |
29c55422 CL |
110 | .extra1 = &min_inline_size, |
111 | .extra2 = &max_inline_size, | |
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 | ||
5d252f90 | 152 | static struct rpc_xprt_ops xprt_rdma_procs; /*forward reference */ |
f58851e6 | 153 | |
0dd39cae CL |
154 | static void |
155 | xprt_rdma_format_addresses4(struct rpc_xprt *xprt, struct sockaddr *sap) | |
156 | { | |
157 | struct sockaddr_in *sin = (struct sockaddr_in *)sap; | |
158 | char buf[20]; | |
159 | ||
160 | snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); | |
161 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); | |
162 | ||
163 | xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA; | |
164 | } | |
165 | ||
166 | static void | |
167 | xprt_rdma_format_addresses6(struct rpc_xprt *xprt, struct sockaddr *sap) | |
168 | { | |
169 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; | |
170 | char buf[40]; | |
171 | ||
172 | snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); | |
173 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); | |
174 | ||
175 | xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA6; | |
176 | } | |
177 | ||
5d252f90 | 178 | void |
5231eb97 | 179 | xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap) |
f58851e6 | 180 | { |
0dd39cae CL |
181 | char buf[128]; |
182 | ||
183 | switch (sap->sa_family) { | |
184 | case AF_INET: | |
185 | xprt_rdma_format_addresses4(xprt, sap); | |
186 | break; | |
187 | case AF_INET6: | |
188 | xprt_rdma_format_addresses6(xprt, sap); | |
189 | break; | |
190 | default: | |
191 | pr_err("rpcrdma: Unrecognized address family\n"); | |
192 | return; | |
193 | } | |
f58851e6 | 194 | |
c877b849 CL |
195 | (void)rpc_ntop(sap, buf, sizeof(buf)); |
196 | xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL); | |
f58851e6 | 197 | |
81160e66 | 198 | snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); |
c877b849 | 199 | xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); |
f58851e6 | 200 | |
81160e66 | 201 | snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); |
c877b849 | 202 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); |
f58851e6 | 203 | |
0dd39cae | 204 | xprt->address_strings[RPC_DISPLAY_PROTO] = "rdma"; |
f58851e6 TT |
205 | } |
206 | ||
5d252f90 | 207 | void |
f58851e6 TT |
208 | xprt_rdma_free_addresses(struct rpc_xprt *xprt) |
209 | { | |
33e01dc7 CL |
210 | unsigned int i; |
211 | ||
212 | for (i = 0; i < RPC_DISPLAY_MAX; i++) | |
213 | switch (i) { | |
214 | case RPC_DISPLAY_PROTO: | |
215 | case RPC_DISPLAY_NETID: | |
216 | continue; | |
217 | default: | |
218 | kfree(xprt->address_strings[i]); | |
219 | } | |
f58851e6 TT |
220 | } |
221 | ||
222 | static void | |
223 | xprt_rdma_connect_worker(struct work_struct *work) | |
224 | { | |
5abefb86 CL |
225 | struct rpcrdma_xprt *r_xprt = container_of(work, struct rpcrdma_xprt, |
226 | rx_connect_worker.work); | |
227 | struct rpc_xprt *xprt = &r_xprt->rx_xprt; | |
f58851e6 TT |
228 | int rc = 0; |
229 | ||
d19751e7 TM |
230 | xprt_clear_connected(xprt); |
231 | ||
232 | dprintk("RPC: %s: %sconnect\n", __func__, | |
233 | r_xprt->rx_ep.rep_connected != 0 ? "re" : ""); | |
234 | rc = rpcrdma_ep_connect(&r_xprt->rx_ep, &r_xprt->rx_ia); | |
235 | if (rc) | |
236 | xprt_wake_pending_tasks(xprt, rc); | |
237 | ||
f58851e6 TT |
238 | dprintk("RPC: %s: exit\n", __func__); |
239 | xprt_clear_connecting(xprt); | |
240 | } | |
241 | ||
4a068258 CL |
242 | static void |
243 | xprt_rdma_inject_disconnect(struct rpc_xprt *xprt) | |
244 | { | |
245 | struct rpcrdma_xprt *r_xprt = container_of(xprt, struct rpcrdma_xprt, | |
246 | rx_xprt); | |
247 | ||
248 | pr_info("rpcrdma: injecting transport disconnect on xprt=%p\n", xprt); | |
249 | rdma_disconnect(r_xprt->rx_ia.ri_id); | |
250 | } | |
251 | ||
f58851e6 TT |
252 | /* |
253 | * xprt_rdma_destroy | |
254 | * | |
255 | * Destroy the xprt. | |
256 | * Free all memory associated with the object, including its own. | |
257 | * NOTE: none of the *destroy methods free memory for their top-level | |
258 | * objects, even though they may have allocated it (they do free | |
259 | * private memory). It's up to the caller to handle it. In this | |
260 | * case (RDMA transport), all structure memory is inlined with the | |
261 | * struct rpcrdma_xprt. | |
262 | */ | |
263 | static void | |
264 | xprt_rdma_destroy(struct rpc_xprt *xprt) | |
265 | { | |
266 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); | |
f58851e6 TT |
267 | |
268 | dprintk("RPC: %s: called\n", __func__); | |
269 | ||
5abefb86 | 270 | cancel_delayed_work_sync(&r_xprt->rx_connect_worker); |
f58851e6 TT |
271 | |
272 | xprt_clear_connected(xprt); | |
273 | ||
7f1d5419 | 274 | rpcrdma_ep_destroy(&r_xprt->rx_ep, &r_xprt->rx_ia); |
72c02173 | 275 | rpcrdma_buffer_destroy(&r_xprt->rx_buf); |
f58851e6 TT |
276 | rpcrdma_ia_close(&r_xprt->rx_ia); |
277 | ||
278 | xprt_rdma_free_addresses(xprt); | |
279 | ||
e204e621 | 280 | xprt_free(xprt); |
f58851e6 TT |
281 | |
282 | dprintk("RPC: %s: returning\n", __func__); | |
283 | ||
284 | module_put(THIS_MODULE); | |
285 | } | |
286 | ||
2881ae74 TM |
287 | static const struct rpc_timeout xprt_rdma_default_timeout = { |
288 | .to_initval = 60 * HZ, | |
289 | .to_maxval = 60 * HZ, | |
290 | }; | |
291 | ||
f58851e6 TT |
292 | /** |
293 | * xprt_setup_rdma - Set up transport to use RDMA | |
294 | * | |
295 | * @args: rpc transport arguments | |
296 | */ | |
297 | static struct rpc_xprt * | |
298 | xprt_setup_rdma(struct xprt_create *args) | |
299 | { | |
300 | struct rpcrdma_create_data_internal cdata; | |
301 | struct rpc_xprt *xprt; | |
302 | struct rpcrdma_xprt *new_xprt; | |
303 | struct rpcrdma_ep *new_ep; | |
5231eb97 | 304 | struct sockaddr *sap; |
f58851e6 TT |
305 | int rc; |
306 | ||
307 | if (args->addrlen > sizeof(xprt->addr)) { | |
308 | dprintk("RPC: %s: address too large\n", __func__); | |
309 | return ERR_PTR(-EBADF); | |
310 | } | |
311 | ||
37aa2133 | 312 | xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt), |
d9ba131d | 313 | xprt_rdma_slot_table_entries, |
bd1722d4 | 314 | xprt_rdma_slot_table_entries); |
f58851e6 TT |
315 | if (xprt == NULL) { |
316 | dprintk("RPC: %s: couldn't allocate rpcrdma_xprt\n", | |
317 | __func__); | |
318 | return ERR_PTR(-ENOMEM); | |
319 | } | |
320 | ||
f58851e6 | 321 | /* 60 second timeout, no retries */ |
ba7392bb | 322 | xprt->timeout = &xprt_rdma_default_timeout; |
bfaee096 CL |
323 | xprt->bind_timeout = RPCRDMA_BIND_TO; |
324 | xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO; | |
325 | xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO; | |
f58851e6 TT |
326 | |
327 | xprt->resvport = 0; /* privileged port not needed */ | |
328 | xprt->tsh_size = 0; /* RPC-RDMA handles framing */ | |
f58851e6 TT |
329 | xprt->ops = &xprt_rdma_procs; |
330 | ||
331 | /* | |
332 | * Set up RDMA-specific connect data. | |
333 | */ | |
334 | ||
5231eb97 CL |
335 | sap = (struct sockaddr *)&cdata.addr; |
336 | memcpy(sap, args->dstaddr, args->addrlen); | |
f58851e6 TT |
337 | |
338 | /* Ensure xprt->addr holds valid server TCP (not RDMA) | |
339 | * address, for any side protocols which peek at it */ | |
340 | xprt->prot = IPPROTO_TCP; | |
341 | xprt->addrlen = args->addrlen; | |
5231eb97 | 342 | memcpy(&xprt->addr, sap, xprt->addrlen); |
f58851e6 | 343 | |
5231eb97 | 344 | if (rpc_get_port(sap)) |
f58851e6 TT |
345 | xprt_set_bound(xprt); |
346 | ||
f58851e6 TT |
347 | cdata.max_requests = xprt->max_reqs; |
348 | ||
f58851e6 TT |
349 | cdata.rsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA write max */ |
350 | cdata.wsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA read max */ | |
351 | ||
352 | cdata.inline_wsize = xprt_rdma_max_inline_write; | |
353 | if (cdata.inline_wsize > cdata.wsize) | |
354 | cdata.inline_wsize = cdata.wsize; | |
355 | ||
356 | cdata.inline_rsize = xprt_rdma_max_inline_read; | |
357 | if (cdata.inline_rsize > cdata.rsize) | |
358 | cdata.inline_rsize = cdata.rsize; | |
359 | ||
360 | cdata.padding = xprt_rdma_inline_write_padding; | |
361 | ||
362 | /* | |
363 | * Create new transport instance, which includes initialized | |
364 | * o ia | |
365 | * o endpoint | |
366 | * o buffers | |
367 | */ | |
368 | ||
369 | new_xprt = rpcx_to_rdmax(xprt); | |
370 | ||
5231eb97 | 371 | rc = rpcrdma_ia_open(new_xprt, sap, xprt_rdma_memreg_strategy); |
f58851e6 TT |
372 | if (rc) |
373 | goto out1; | |
374 | ||
375 | /* | |
376 | * initialize and create ep | |
377 | */ | |
378 | new_xprt->rx_data = cdata; | |
379 | new_ep = &new_xprt->rx_ep; | |
380 | new_ep->rep_remote_addr = cdata.addr; | |
381 | ||
382 | rc = rpcrdma_ep_create(&new_xprt->rx_ep, | |
383 | &new_xprt->rx_ia, &new_xprt->rx_data); | |
384 | if (rc) | |
385 | goto out2; | |
386 | ||
387 | /* | |
388 | * Allocate pre-registered send and receive buffers for headers and | |
389 | * any inline data. Also specify any padding which will be provided | |
390 | * from a preregistered zero buffer. | |
391 | */ | |
ac920d04 | 392 | rc = rpcrdma_buffer_create(new_xprt); |
f58851e6 TT |
393 | if (rc) |
394 | goto out3; | |
395 | ||
396 | /* | |
397 | * Register a callback for connection events. This is necessary because | |
398 | * connection loss notification is async. We also catch connection loss | |
399 | * when reaping receives. | |
400 | */ | |
5abefb86 CL |
401 | INIT_DELAYED_WORK(&new_xprt->rx_connect_worker, |
402 | xprt_rdma_connect_worker); | |
f58851e6 | 403 | |
5231eb97 | 404 | xprt_rdma_format_addresses(xprt, sap); |
1c9351ee CL |
405 | xprt->max_payload = new_xprt->rx_ia.ri_ops->ro_maxpages(new_xprt); |
406 | if (xprt->max_payload == 0) | |
407 | goto out4; | |
408 | xprt->max_payload <<= PAGE_SHIFT; | |
43e95988 CL |
409 | dprintk("RPC: %s: transport data payload maximum: %zu bytes\n", |
410 | __func__, xprt->max_payload); | |
f58851e6 TT |
411 | |
412 | if (!try_module_get(THIS_MODULE)) | |
413 | goto out4; | |
414 | ||
5231eb97 CL |
415 | dprintk("RPC: %s: %s:%s\n", __func__, |
416 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
417 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
f58851e6 TT |
418 | return xprt; |
419 | ||
420 | out4: | |
421 | xprt_rdma_free_addresses(xprt); | |
422 | rc = -EINVAL; | |
423 | out3: | |
7f1d5419 | 424 | rpcrdma_ep_destroy(new_ep, &new_xprt->rx_ia); |
f58851e6 TT |
425 | out2: |
426 | rpcrdma_ia_close(&new_xprt->rx_ia); | |
427 | out1: | |
e204e621 | 428 | xprt_free(xprt); |
f58851e6 TT |
429 | return ERR_PTR(rc); |
430 | } | |
431 | ||
432 | /* | |
433 | * Close a connection, during shutdown or timeout/reconnect | |
434 | */ | |
435 | static void | |
436 | xprt_rdma_close(struct rpc_xprt *xprt) | |
437 | { | |
438 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); | |
439 | ||
440 | dprintk("RPC: %s: closing\n", __func__); | |
08ca0dce TT |
441 | if (r_xprt->rx_ep.rep_connected > 0) |
442 | xprt->reestablish_timeout = 0; | |
62da3b24 | 443 | xprt_disconnect_done(xprt); |
282191cb | 444 | rpcrdma_ep_disconnect(&r_xprt->rx_ep, &r_xprt->rx_ia); |
f58851e6 TT |
445 | } |
446 | ||
447 | static void | |
448 | xprt_rdma_set_port(struct rpc_xprt *xprt, u16 port) | |
449 | { | |
450 | struct sockaddr_in *sap; | |
451 | ||
452 | sap = (struct sockaddr_in *)&xprt->addr; | |
453 | sap->sin_port = htons(port); | |
454 | sap = (struct sockaddr_in *)&rpcx_to_rdmad(xprt).addr; | |
455 | sap->sin_port = htons(port); | |
456 | dprintk("RPC: %s: %u\n", __func__, port); | |
457 | } | |
458 | ||
459 | static void | |
1b092092 | 460 | xprt_rdma_connect(struct rpc_xprt *xprt, struct rpc_task *task) |
f58851e6 | 461 | { |
f58851e6 TT |
462 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); |
463 | ||
0b9e7943 TM |
464 | if (r_xprt->rx_ep.rep_connected != 0) { |
465 | /* Reconnect */ | |
5abefb86 CL |
466 | schedule_delayed_work(&r_xprt->rx_connect_worker, |
467 | xprt->reestablish_timeout); | |
0b9e7943 | 468 | xprt->reestablish_timeout <<= 1; |
bfaee096 CL |
469 | if (xprt->reestablish_timeout > RPCRDMA_MAX_REEST_TO) |
470 | xprt->reestablish_timeout = RPCRDMA_MAX_REEST_TO; | |
471 | else if (xprt->reestablish_timeout < RPCRDMA_INIT_REEST_TO) | |
472 | xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO; | |
0b9e7943 | 473 | } else { |
5abefb86 | 474 | schedule_delayed_work(&r_xprt->rx_connect_worker, 0); |
0b9e7943 | 475 | if (!RPC_IS_ASYNC(task)) |
5abefb86 | 476 | flush_delayed_work(&r_xprt->rx_connect_worker); |
f58851e6 TT |
477 | } |
478 | } | |
479 | ||
9c40c49f CL |
480 | /* Allocate a fixed-size buffer in which to construct and send the |
481 | * RPC-over-RDMA header for this request. | |
482 | */ | |
483 | static bool | |
484 | rpcrdma_get_rdmabuf(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req, | |
485 | gfp_t flags) | |
486 | { | |
08cf2efd | 487 | size_t size = RPCRDMA_HDRBUF_SIZE; |
9c40c49f CL |
488 | struct rpcrdma_regbuf *rb; |
489 | ||
490 | if (req->rl_rdmabuf) | |
491 | return true; | |
492 | ||
13650c23 | 493 | rb = rpcrdma_alloc_regbuf(size, DMA_TO_DEVICE, flags); |
9c40c49f CL |
494 | if (IS_ERR(rb)) |
495 | return false; | |
496 | ||
497 | r_xprt->rx_stats.hardway_register_count += size; | |
498 | req->rl_rdmabuf = rb; | |
499 | return true; | |
500 | } | |
501 | ||
9c40c49f CL |
502 | static bool |
503 | rpcrdma_get_sendbuf(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req, | |
504 | size_t size, gfp_t flags) | |
505 | { | |
506 | struct rpcrdma_regbuf *rb; | |
9c40c49f CL |
507 | |
508 | if (req->rl_sendbuf && rdmab_length(req->rl_sendbuf) >= size) | |
509 | return true; | |
510 | ||
655fec69 | 511 | rb = rpcrdma_alloc_regbuf(size, DMA_TO_DEVICE, flags); |
9c40c49f CL |
512 | if (IS_ERR(rb)) |
513 | return false; | |
514 | ||
13650c23 | 515 | rpcrdma_free_regbuf(req->rl_sendbuf); |
655fec69 | 516 | r_xprt->rx_stats.hardway_register_count += size; |
9c40c49f CL |
517 | req->rl_sendbuf = rb; |
518 | return true; | |
519 | } | |
520 | ||
521 | /* The rq_rcv_buf is used only if a Reply chunk is necessary. | |
522 | * The decision to use a Reply chunk is made later in | |
523 | * rpcrdma_marshal_req. This buffer is registered at that time. | |
524 | * | |
525 | * Otherwise, the associated RPC Reply arrives in a separate | |
526 | * Receive buffer, arbitrarily chosen by the HCA. The buffer | |
527 | * allocated here for the RPC Reply is not utilized in that | |
528 | * case. See rpcrdma_inline_fixup. | |
529 | * | |
530 | * A regbuf is used here to remember the buffer size. | |
531 | */ | |
532 | static bool | |
533 | rpcrdma_get_recvbuf(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req, | |
534 | size_t size, gfp_t flags) | |
535 | { | |
536 | struct rpcrdma_regbuf *rb; | |
537 | ||
538 | if (req->rl_recvbuf && rdmab_length(req->rl_recvbuf) >= size) | |
539 | return true; | |
540 | ||
13650c23 | 541 | rb = rpcrdma_alloc_regbuf(size, DMA_NONE, flags); |
9c40c49f CL |
542 | if (IS_ERR(rb)) |
543 | return false; | |
544 | ||
13650c23 | 545 | rpcrdma_free_regbuf(req->rl_recvbuf); |
9c40c49f CL |
546 | r_xprt->rx_stats.hardway_register_count += size; |
547 | req->rl_recvbuf = rb; | |
548 | return true; | |
549 | } | |
550 | ||
5fe6eaa1 CL |
551 | /** |
552 | * xprt_rdma_allocate - allocate transport resources for an RPC | |
553 | * @task: RPC task | |
554 | * | |
555 | * Return values: | |
556 | * 0: Success; rq_buffer points to RPC buffer to use | |
557 | * ENOMEM: Out of memory, call again later | |
558 | * EIO: A permanent error occurred, do not retry | |
559 | * | |
f58851e6 | 560 | * The RDMA allocate/free functions need the task structure as a place |
9c40c49f CL |
561 | * to hide the struct rpcrdma_req, which is necessary for the actual |
562 | * send/recv sequence. | |
0ca77dc3 | 563 | * |
9c40c49f CL |
564 | * xprt_rdma_allocate provides buffers that are already mapped for |
565 | * DMA, and a local DMA lkey is provided for each. | |
f58851e6 | 566 | */ |
5fe6eaa1 CL |
567 | static int |
568 | xprt_rdma_allocate(struct rpc_task *task) | |
f58851e6 | 569 | { |
5fe6eaa1 | 570 | struct rpc_rqst *rqst = task->tk_rqstp; |
5fe6eaa1 | 571 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt); |
0ca77dc3 | 572 | struct rpcrdma_req *req; |
a0a1d50c | 573 | gfp_t flags; |
f58851e6 | 574 | |
0ca77dc3 | 575 | req = rpcrdma_buffer_get(&r_xprt->rx_buf); |
c977dea2 | 576 | if (req == NULL) |
5fe6eaa1 | 577 | return -ENOMEM; |
f58851e6 | 578 | |
5d252f90 | 579 | flags = RPCRDMA_DEF_GFP; |
a0a1d50c CL |
580 | if (RPC_IS_SWAPPER(task)) |
581 | flags = __GFP_MEMALLOC | GFP_NOWAIT | __GFP_NOWARN; | |
582 | ||
9c40c49f CL |
583 | if (!rpcrdma_get_rdmabuf(r_xprt, req, flags)) |
584 | goto out_fail; | |
585 | if (!rpcrdma_get_sendbuf(r_xprt, req, rqst->rq_callsize, flags)) | |
586 | goto out_fail; | |
587 | if (!rpcrdma_get_recvbuf(r_xprt, req, rqst->rq_rcvsize, flags)) | |
588 | goto out_fail; | |
589 | ||
590 | dprintk("RPC: %5u %s: send size = %zd, recv size = %zd, req = %p\n", | |
591 | task->tk_pid, __func__, rqst->rq_callsize, | |
592 | rqst->rq_rcvsize, req); | |
0ca77dc3 | 593 | |
575448bd | 594 | req->rl_connect_cookie = 0; /* our reserved value */ |
5a6d1db4 | 595 | rpcrdma_set_xprtdata(rqst, req); |
5fe6eaa1 | 596 | rqst->rq_buffer = req->rl_sendbuf->rg_base; |
9c40c49f | 597 | rqst->rq_rbuffer = req->rl_recvbuf->rg_base; |
5fe6eaa1 | 598 | return 0; |
0ca77dc3 | 599 | |
0ca77dc3 | 600 | out_fail: |
f58851e6 | 601 | rpcrdma_buffer_put(req); |
5fe6eaa1 | 602 | return -ENOMEM; |
f58851e6 TT |
603 | } |
604 | ||
3435c74a CL |
605 | /** |
606 | * xprt_rdma_free - release resources allocated by xprt_rdma_allocate | |
607 | * @task: RPC task | |
608 | * | |
609 | * Caller guarantees rqst->rq_buffer is non-NULL. | |
f58851e6 TT |
610 | */ |
611 | static void | |
3435c74a | 612 | xprt_rdma_free(struct rpc_task *task) |
f58851e6 | 613 | { |
3435c74a CL |
614 | struct rpc_rqst *rqst = task->tk_rqstp; |
615 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt); | |
616 | struct rpcrdma_req *req = rpcr_to_rdmar(rqst); | |
655fec69 | 617 | struct rpcrdma_ia *ia = &r_xprt->rx_ia; |
f58851e6 | 618 | |
ffc4d9b1 CL |
619 | if (req->rl_backchannel) |
620 | return; | |
621 | ||
0ca77dc3 | 622 | dprintk("RPC: %s: called on 0x%p\n", __func__, req->rl_reply); |
f58851e6 | 623 | |
655fec69 CL |
624 | ia->ri_ops->ro_unmap_safe(r_xprt, req, !RPC_IS_ASYNC(task)); |
625 | rpcrdma_unmap_sges(ia, req); | |
f58851e6 TT |
626 | rpcrdma_buffer_put(req); |
627 | } | |
628 | ||
7a89f9c6 CL |
629 | /** |
630 | * xprt_rdma_send_request - marshal and send an RPC request | |
631 | * @task: RPC task with an RPC message in rq_snd_buf | |
632 | * | |
633 | * Return values: | |
634 | * 0: The request has been sent | |
635 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
636 | * ENOBUFS: Call again later to send the request | |
637 | * EIO: A permanent error occurred. The request was not sent, | |
638 | * and don't try it again | |
639 | * | |
f58851e6 | 640 | * send_request invokes the meat of RPC RDMA. It must do the following: |
7a89f9c6 | 641 | * |
f58851e6 TT |
642 | * 1. Marshal the RPC request into an RPC RDMA request, which means |
643 | * putting a header in front of data, and creating IOVs for RDMA | |
644 | * from those in the request. | |
645 | * 2. In marshaling, detect opportunities for RDMA, and use them. | |
646 | * 3. Post a recv message to set up asynch completion, then send | |
647 | * the request (rpcrdma_ep_post). | |
648 | * 4. No partial sends are possible in the RPC-RDMA protocol (as in UDP). | |
649 | */ | |
f58851e6 TT |
650 | static int |
651 | xprt_rdma_send_request(struct rpc_task *task) | |
652 | { | |
653 | struct rpc_rqst *rqst = task->tk_rqstp; | |
a4f0835c | 654 | struct rpc_xprt *xprt = rqst->rq_xprt; |
f58851e6 TT |
655 | struct rpcrdma_req *req = rpcr_to_rdmar(rqst); |
656 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); | |
6ab59945 | 657 | int rc = 0; |
f58851e6 | 658 | |
9d6b0409 CL |
659 | /* On retransmit, remove any previously registered chunks */ |
660 | r_xprt->rx_ia.ri_ops->ro_unmap_safe(r_xprt, req, false); | |
661 | ||
e2377945 | 662 | rc = rpcrdma_marshal_req(rqst); |
6ab59945 CL |
663 | if (rc < 0) |
664 | goto failed_marshal; | |
f58851e6 TT |
665 | |
666 | if (req->rl_reply == NULL) /* e.g. reconnection */ | |
667 | rpcrdma_recv_buffer_get(req); | |
668 | ||
575448bd TT |
669 | /* Must suppress retransmit to maintain credits */ |
670 | if (req->rl_connect_cookie == xprt->connect_cookie) | |
671 | goto drop_connection; | |
672 | req->rl_connect_cookie = xprt->connect_cookie; | |
673 | ||
674 | if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req)) | |
675 | goto drop_connection; | |
f58851e6 | 676 | |
d60dbb20 | 677 | rqst->rq_xmit_bytes_sent += rqst->rq_snd_buf.len; |
f58851e6 TT |
678 | rqst->rq_bytes_sent = 0; |
679 | return 0; | |
575448bd | 680 | |
c93c6223 | 681 | failed_marshal: |
c93c6223 CL |
682 | dprintk("RPC: %s: rpcrdma_marshal_req failed, status %i\n", |
683 | __func__, rc); | |
684 | if (rc == -EIO) | |
7a89f9c6 CL |
685 | r_xprt->rx_stats.failed_marshal_count++; |
686 | if (rc != -ENOTCONN) | |
687 | return rc; | |
575448bd TT |
688 | drop_connection: |
689 | xprt_disconnect_done(xprt); | |
690 | return -ENOTCONN; /* implies disconnect */ | |
f58851e6 TT |
691 | } |
692 | ||
5d252f90 | 693 | void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) |
f58851e6 TT |
694 | { |
695 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); | |
696 | long idle_time = 0; | |
697 | ||
698 | if (xprt_connected(xprt)) | |
699 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
700 | ||
763f7e4e CL |
701 | seq_puts(seq, "\txprt:\trdma "); |
702 | seq_printf(seq, "%u %lu %lu %lu %ld %lu %lu %lu %llu %llu ", | |
703 | 0, /* need a local port? */ | |
704 | xprt->stat.bind_count, | |
705 | xprt->stat.connect_count, | |
706 | xprt->stat.connect_time, | |
707 | idle_time, | |
708 | xprt->stat.sends, | |
709 | xprt->stat.recvs, | |
710 | xprt->stat.bad_xids, | |
711 | xprt->stat.req_u, | |
712 | xprt->stat.bklog_u); | |
505bbe64 | 713 | seq_printf(seq, "%lu %lu %lu %llu %llu %llu %llu %lu %lu %lu %lu ", |
763f7e4e CL |
714 | r_xprt->rx_stats.read_chunk_count, |
715 | r_xprt->rx_stats.write_chunk_count, | |
716 | r_xprt->rx_stats.reply_chunk_count, | |
717 | r_xprt->rx_stats.total_rdma_request, | |
718 | r_xprt->rx_stats.total_rdma_reply, | |
719 | r_xprt->rx_stats.pullup_copy_count, | |
720 | r_xprt->rx_stats.fixup_copy_count, | |
721 | r_xprt->rx_stats.hardway_register_count, | |
722 | r_xprt->rx_stats.failed_marshal_count, | |
860477d1 CL |
723 | r_xprt->rx_stats.bad_reply_count, |
724 | r_xprt->rx_stats.nomsg_call_count); | |
c8b920bb | 725 | seq_printf(seq, "%lu %lu %lu %lu\n", |
505bbe64 | 726 | r_xprt->rx_stats.mrs_recovered, |
e2ac236c | 727 | r_xprt->rx_stats.mrs_orphaned, |
c8b920bb CL |
728 | r_xprt->rx_stats.mrs_allocated, |
729 | r_xprt->rx_stats.local_inv_needed); | |
f58851e6 TT |
730 | } |
731 | ||
d67fa4d8 JL |
732 | static int |
733 | xprt_rdma_enable_swap(struct rpc_xprt *xprt) | |
734 | { | |
a0451788 | 735 | return 0; |
d67fa4d8 JL |
736 | } |
737 | ||
738 | static void | |
739 | xprt_rdma_disable_swap(struct rpc_xprt *xprt) | |
740 | { | |
741 | } | |
742 | ||
f58851e6 TT |
743 | /* |
744 | * Plumbing for rpc transport switch and kernel module | |
745 | */ | |
746 | ||
747 | static struct rpc_xprt_ops xprt_rdma_procs = { | |
e7ce710a | 748 | .reserve_xprt = xprt_reserve_xprt_cong, |
f58851e6 | 749 | .release_xprt = xprt_release_xprt_cong, /* sunrpc/xprt.c */ |
f39c1bfb | 750 | .alloc_slot = xprt_alloc_slot, |
f58851e6 TT |
751 | .release_request = xprt_release_rqst_cong, /* ditto */ |
752 | .set_retrans_timeout = xprt_set_retrans_timeout_def, /* ditto */ | |
753 | .rpcbind = rpcb_getport_async, /* sunrpc/rpcb_clnt.c */ | |
754 | .set_port = xprt_rdma_set_port, | |
755 | .connect = xprt_rdma_connect, | |
756 | .buf_alloc = xprt_rdma_allocate, | |
757 | .buf_free = xprt_rdma_free, | |
758 | .send_request = xprt_rdma_send_request, | |
759 | .close = xprt_rdma_close, | |
760 | .destroy = xprt_rdma_destroy, | |
d67fa4d8 JL |
761 | .print_stats = xprt_rdma_print_stats, |
762 | .enable_swap = xprt_rdma_enable_swap, | |
763 | .disable_swap = xprt_rdma_disable_swap, | |
f531a5db CL |
764 | .inject_disconnect = xprt_rdma_inject_disconnect, |
765 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) | |
766 | .bc_setup = xprt_rdma_bc_setup, | |
76566773 | 767 | .bc_up = xprt_rdma_bc_up, |
6b26cc8c | 768 | .bc_maxpayload = xprt_rdma_bc_maxpayload, |
f531a5db CL |
769 | .bc_free_rqst = xprt_rdma_bc_free_rqst, |
770 | .bc_destroy = xprt_rdma_bc_destroy, | |
771 | #endif | |
f58851e6 TT |
772 | }; |
773 | ||
774 | static struct xprt_class xprt_rdma = { | |
775 | .list = LIST_HEAD_INIT(xprt_rdma.list), | |
776 | .name = "rdma", | |
777 | .owner = THIS_MODULE, | |
778 | .ident = XPRT_TRANSPORT_RDMA, | |
779 | .setup = xprt_setup_rdma, | |
780 | }; | |
781 | ||
ffe1f0df | 782 | void xprt_rdma_cleanup(void) |
f58851e6 TT |
783 | { |
784 | int rc; | |
785 | ||
3a0799a9 | 786 | dprintk("RPCRDMA Module Removed, deregister RPC RDMA transport\n"); |
f895b252 | 787 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
f58851e6 TT |
788 | if (sunrpc_table_header) { |
789 | unregister_sysctl_table(sunrpc_table_header); | |
790 | sunrpc_table_header = NULL; | |
791 | } | |
792 | #endif | |
793 | rc = xprt_unregister_transport(&xprt_rdma); | |
794 | if (rc) | |
795 | dprintk("RPC: %s: xprt_unregister returned %i\n", | |
796 | __func__, rc); | |
951e721c | 797 | |
fe97b47c | 798 | rpcrdma_destroy_wq(); |
5d252f90 CL |
799 | |
800 | rc = xprt_unregister_transport(&xprt_rdma_bc); | |
801 | if (rc) | |
802 | dprintk("RPC: %s: xprt_unregister(bc) returned %i\n", | |
803 | __func__, rc); | |
f58851e6 TT |
804 | } |
805 | ||
ffe1f0df | 806 | int xprt_rdma_init(void) |
f58851e6 TT |
807 | { |
808 | int rc; | |
809 | ||
fe97b47c | 810 | rc = rpcrdma_alloc_wq(); |
505bbe64 | 811 | if (rc) |
fe97b47c | 812 | return rc; |
fe97b47c | 813 | |
951e721c CL |
814 | rc = xprt_register_transport(&xprt_rdma); |
815 | if (rc) { | |
fe97b47c | 816 | rpcrdma_destroy_wq(); |
951e721c CL |
817 | return rc; |
818 | } | |
819 | ||
5d252f90 CL |
820 | rc = xprt_register_transport(&xprt_rdma_bc); |
821 | if (rc) { | |
822 | xprt_unregister_transport(&xprt_rdma); | |
823 | rpcrdma_destroy_wq(); | |
5d252f90 CL |
824 | return rc; |
825 | } | |
826 | ||
3a0799a9 | 827 | dprintk("RPCRDMA Module Init, register RPC RDMA transport\n"); |
f58851e6 | 828 | |
3a0799a9 CL |
829 | dprintk("Defaults:\n"); |
830 | dprintk("\tSlots %d\n" | |
f58851e6 TT |
831 | "\tMaxInlineRead %d\n\tMaxInlineWrite %d\n", |
832 | xprt_rdma_slot_table_entries, | |
833 | xprt_rdma_max_inline_read, xprt_rdma_max_inline_write); | |
3a0799a9 | 834 | dprintk("\tPadding %d\n\tMemreg %d\n", |
f58851e6 TT |
835 | xprt_rdma_inline_write_padding, xprt_rdma_memreg_strategy); |
836 | ||
f895b252 | 837 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
f58851e6 TT |
838 | if (!sunrpc_table_header) |
839 | sunrpc_table_header = register_sysctl_table(sunrpc_table); | |
840 | #endif | |
841 | return 0; | |
842 | } |