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f58851e6 | 1 | /* |
62b56a67 | 2 | * Copyright (c) 2014-2017 Oracle. All rights reserved. |
f58851e6 TT |
3 | * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved. |
4 | * | |
5 | * This software is available to you under a choice of one of two | |
6 | * licenses. You may choose to be licensed under the terms of the GNU | |
7 | * General Public License (GPL) Version 2, available from the file | |
8 | * COPYING in the main directory of this source tree, or the BSD-type | |
9 | * license below: | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * | |
15 | * Redistributions of source code must retain the above copyright | |
16 | * notice, this list of conditions and the following disclaimer. | |
17 | * | |
18 | * Redistributions in binary form must reproduce the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer in the documentation and/or other materials provided | |
21 | * with the distribution. | |
22 | * | |
23 | * Neither the name of the Network Appliance, Inc. nor the names of | |
24 | * its contributors may be used to endorse or promote products | |
25 | * derived from this software without specific prior written | |
26 | * permission. | |
27 | * | |
28 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
29 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
30 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
31 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
32 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
33 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
34 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
35 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
36 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
37 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
38 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
39 | */ | |
40 | ||
41 | /* | |
42 | * transport.c | |
43 | * | |
44 | * This file contains the top-level implementation of an RPC RDMA | |
45 | * transport. | |
46 | * | |
47 | * Naming convention: functions beginning with xprt_ are part of the | |
48 | * transport switch. All others are RPC RDMA internal. | |
49 | */ | |
50 | ||
51 | #include <linux/module.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 | ||
f58851e6 TT |
62 | /* |
63 | * tunables | |
64 | */ | |
65 | ||
66 | static unsigned int xprt_rdma_slot_table_entries = RPCRDMA_DEF_SLOT_TABLE; | |
5d252f90 | 67 | unsigned int xprt_rdma_max_inline_read = RPCRDMA_DEF_INLINE; |
f58851e6 | 68 | static unsigned int xprt_rdma_max_inline_write = RPCRDMA_DEF_INLINE; |
ce5b3717 | 69 | unsigned int xprt_rdma_memreg_strategy = RPCRDMA_FRWR; |
fff09594 | 70 | int xprt_rdma_pad_optimize; |
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; | |
10492704 | 82 | static unsigned int dummy; |
f58851e6 TT |
83 | |
84 | static struct ctl_table_header *sunrpc_table_header; | |
85 | ||
fe2c6338 | 86 | static struct ctl_table xr_tunables_table[] = { |
f58851e6 | 87 | { |
f58851e6 TT |
88 | .procname = "rdma_slot_table_entries", |
89 | .data = &xprt_rdma_slot_table_entries, | |
90 | .maxlen = sizeof(unsigned int), | |
91 | .mode = 0644, | |
6d456111 | 92 | .proc_handler = proc_dointvec_minmax, |
f58851e6 TT |
93 | .extra1 = &min_slot_table_size, |
94 | .extra2 = &max_slot_table_size | |
95 | }, | |
96 | { | |
f58851e6 TT |
97 | .procname = "rdma_max_inline_read", |
98 | .data = &xprt_rdma_max_inline_read, | |
99 | .maxlen = sizeof(unsigned int), | |
100 | .mode = 0644, | |
44829d02 | 101 | .proc_handler = proc_dointvec_minmax, |
29c55422 CL |
102 | .extra1 = &min_inline_size, |
103 | .extra2 = &max_inline_size, | |
f58851e6 TT |
104 | }, |
105 | { | |
f58851e6 TT |
106 | .procname = "rdma_max_inline_write", |
107 | .data = &xprt_rdma_max_inline_write, | |
108 | .maxlen = sizeof(unsigned int), | |
109 | .mode = 0644, | |
44829d02 | 110 | .proc_handler = proc_dointvec_minmax, |
29c55422 CL |
111 | .extra1 = &min_inline_size, |
112 | .extra2 = &max_inline_size, | |
f58851e6 TT |
113 | }, |
114 | { | |
f58851e6 | 115 | .procname = "rdma_inline_write_padding", |
10492704 | 116 | .data = &dummy, |
f58851e6 TT |
117 | .maxlen = sizeof(unsigned int), |
118 | .mode = 0644, | |
6d456111 | 119 | .proc_handler = proc_dointvec_minmax, |
f58851e6 TT |
120 | .extra1 = &zero, |
121 | .extra2 = &max_padding, | |
122 | }, | |
123 | { | |
f58851e6 TT |
124 | .procname = "rdma_memreg_strategy", |
125 | .data = &xprt_rdma_memreg_strategy, | |
126 | .maxlen = sizeof(unsigned int), | |
127 | .mode = 0644, | |
6d456111 | 128 | .proc_handler = proc_dointvec_minmax, |
f58851e6 TT |
129 | .extra1 = &min_memreg, |
130 | .extra2 = &max_memreg, | |
131 | }, | |
9191ca3b | 132 | { |
9191ca3b TT |
133 | .procname = "rdma_pad_optimize", |
134 | .data = &xprt_rdma_pad_optimize, | |
135 | .maxlen = sizeof(unsigned int), | |
136 | .mode = 0644, | |
6d456111 | 137 | .proc_handler = proc_dointvec, |
9191ca3b | 138 | }, |
f8572d8f | 139 | { }, |
f58851e6 TT |
140 | }; |
141 | ||
fe2c6338 | 142 | static struct ctl_table sunrpc_table[] = { |
f58851e6 | 143 | { |
f58851e6 TT |
144 | .procname = "sunrpc", |
145 | .mode = 0555, | |
146 | .child = xr_tunables_table | |
147 | }, | |
f8572d8f | 148 | { }, |
f58851e6 TT |
149 | }; |
150 | ||
151 | #endif | |
152 | ||
d31ae254 | 153 | static const struct rpc_xprt_ops xprt_rdma_procs; |
f58851e6 | 154 | |
0dd39cae CL |
155 | static void |
156 | xprt_rdma_format_addresses4(struct rpc_xprt *xprt, struct sockaddr *sap) | |
157 | { | |
158 | struct sockaddr_in *sin = (struct sockaddr_in *)sap; | |
159 | char buf[20]; | |
160 | ||
161 | snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); | |
162 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); | |
163 | ||
164 | xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA; | |
165 | } | |
166 | ||
167 | static void | |
168 | xprt_rdma_format_addresses6(struct rpc_xprt *xprt, struct sockaddr *sap) | |
169 | { | |
170 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; | |
171 | char buf[40]; | |
172 | ||
173 | snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); | |
174 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); | |
175 | ||
176 | xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA6; | |
177 | } | |
178 | ||
5d252f90 | 179 | void |
5231eb97 | 180 | xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap) |
f58851e6 | 181 | { |
0dd39cae CL |
182 | char buf[128]; |
183 | ||
184 | switch (sap->sa_family) { | |
185 | case AF_INET: | |
186 | xprt_rdma_format_addresses4(xprt, sap); | |
187 | break; | |
188 | case AF_INET6: | |
189 | xprt_rdma_format_addresses6(xprt, sap); | |
190 | break; | |
191 | default: | |
192 | pr_err("rpcrdma: Unrecognized address family\n"); | |
193 | return; | |
194 | } | |
f58851e6 | 195 | |
c877b849 CL |
196 | (void)rpc_ntop(sap, buf, sizeof(buf)); |
197 | xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL); | |
f58851e6 | 198 | |
81160e66 | 199 | snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); |
c877b849 | 200 | xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); |
f58851e6 | 201 | |
81160e66 | 202 | snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); |
c877b849 | 203 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); |
f58851e6 | 204 | |
0dd39cae | 205 | xprt->address_strings[RPC_DISPLAY_PROTO] = "rdma"; |
f58851e6 TT |
206 | } |
207 | ||
5d252f90 | 208 | void |
f58851e6 TT |
209 | xprt_rdma_free_addresses(struct rpc_xprt *xprt) |
210 | { | |
33e01dc7 CL |
211 | unsigned int i; |
212 | ||
213 | for (i = 0; i < RPC_DISPLAY_MAX; i++) | |
214 | switch (i) { | |
215 | case RPC_DISPLAY_PROTO: | |
216 | case RPC_DISPLAY_NETID: | |
217 | continue; | |
218 | default: | |
219 | kfree(xprt->address_strings[i]); | |
220 | } | |
f58851e6 TT |
221 | } |
222 | ||
3a72dc77 CL |
223 | void |
224 | rpcrdma_conn_func(struct rpcrdma_ep *ep) | |
225 | { | |
226 | schedule_delayed_work(&ep->rep_connect_worker, 0); | |
227 | } | |
228 | ||
229 | void | |
230 | rpcrdma_connect_worker(struct work_struct *work) | |
231 | { | |
232 | struct rpcrdma_ep *ep = | |
233 | container_of(work, struct rpcrdma_ep, rep_connect_worker.work); | |
234 | struct rpcrdma_xprt *r_xprt = | |
235 | container_of(ep, struct rpcrdma_xprt, rx_ep); | |
236 | struct rpc_xprt *xprt = &r_xprt->rx_xprt; | |
237 | ||
238 | spin_lock_bh(&xprt->transport_lock); | |
3a72dc77 CL |
239 | if (ep->rep_connected > 0) { |
240 | if (!xprt_test_and_set_connected(xprt)) | |
241 | xprt_wake_pending_tasks(xprt, 0); | |
242 | } else { | |
243 | if (xprt_test_and_clear_connected(xprt)) | |
244 | xprt_wake_pending_tasks(xprt, -ENOTCONN); | |
245 | } | |
246 | spin_unlock_bh(&xprt->transport_lock); | |
247 | } | |
248 | ||
f58851e6 TT |
249 | static void |
250 | xprt_rdma_connect_worker(struct work_struct *work) | |
251 | { | |
5abefb86 CL |
252 | struct rpcrdma_xprt *r_xprt = container_of(work, struct rpcrdma_xprt, |
253 | rx_connect_worker.work); | |
254 | struct rpc_xprt *xprt = &r_xprt->rx_xprt; | |
f58851e6 TT |
255 | int rc = 0; |
256 | ||
d19751e7 TM |
257 | xprt_clear_connected(xprt); |
258 | ||
d19751e7 TM |
259 | rc = rpcrdma_ep_connect(&r_xprt->rx_ep, &r_xprt->rx_ia); |
260 | if (rc) | |
261 | xprt_wake_pending_tasks(xprt, rc); | |
262 | ||
f58851e6 TT |
263 | xprt_clear_connecting(xprt); |
264 | } | |
265 | ||
4a068258 CL |
266 | static void |
267 | xprt_rdma_inject_disconnect(struct rpc_xprt *xprt) | |
268 | { | |
269 | struct rpcrdma_xprt *r_xprt = container_of(xprt, struct rpcrdma_xprt, | |
270 | rx_xprt); | |
271 | ||
b4744e00 | 272 | trace_xprtrdma_inject_dsc(r_xprt); |
4a068258 CL |
273 | rdma_disconnect(r_xprt->rx_ia.ri_id); |
274 | } | |
275 | ||
f58851e6 TT |
276 | /* |
277 | * xprt_rdma_destroy | |
278 | * | |
279 | * Destroy the xprt. | |
280 | * Free all memory associated with the object, including its own. | |
281 | * NOTE: none of the *destroy methods free memory for their top-level | |
282 | * objects, even though they may have allocated it (they do free | |
283 | * private memory). It's up to the caller to handle it. In this | |
284 | * case (RDMA transport), all structure memory is inlined with the | |
285 | * struct rpcrdma_xprt. | |
286 | */ | |
287 | static void | |
288 | xprt_rdma_destroy(struct rpc_xprt *xprt) | |
289 | { | |
290 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); | |
f58851e6 | 291 | |
b4744e00 | 292 | trace_xprtrdma_destroy(r_xprt); |
f58851e6 | 293 | |
5abefb86 | 294 | cancel_delayed_work_sync(&r_xprt->rx_connect_worker); |
f58851e6 TT |
295 | |
296 | xprt_clear_connected(xprt); | |
297 | ||
7f1d5419 | 298 | rpcrdma_ep_destroy(&r_xprt->rx_ep, &r_xprt->rx_ia); |
72c02173 | 299 | rpcrdma_buffer_destroy(&r_xprt->rx_buf); |
f58851e6 TT |
300 | rpcrdma_ia_close(&r_xprt->rx_ia); |
301 | ||
302 | xprt_rdma_free_addresses(xprt); | |
e204e621 | 303 | xprt_free(xprt); |
f58851e6 | 304 | |
f58851e6 TT |
305 | module_put(THIS_MODULE); |
306 | } | |
307 | ||
2881ae74 TM |
308 | static const struct rpc_timeout xprt_rdma_default_timeout = { |
309 | .to_initval = 60 * HZ, | |
310 | .to_maxval = 60 * HZ, | |
311 | }; | |
312 | ||
f58851e6 TT |
313 | /** |
314 | * xprt_setup_rdma - Set up transport to use RDMA | |
315 | * | |
316 | * @args: rpc transport arguments | |
317 | */ | |
318 | static struct rpc_xprt * | |
319 | xprt_setup_rdma(struct xprt_create *args) | |
320 | { | |
321 | struct rpcrdma_create_data_internal cdata; | |
322 | struct rpc_xprt *xprt; | |
323 | struct rpcrdma_xprt *new_xprt; | |
324 | struct rpcrdma_ep *new_ep; | |
5231eb97 | 325 | struct sockaddr *sap; |
f58851e6 TT |
326 | int rc; |
327 | ||
328 | if (args->addrlen > sizeof(xprt->addr)) { | |
329 | dprintk("RPC: %s: address too large\n", __func__); | |
330 | return ERR_PTR(-EBADF); | |
331 | } | |
332 | ||
37aa2133 | 333 | xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt), |
d9ba131d | 334 | xprt_rdma_slot_table_entries, |
bd1722d4 | 335 | xprt_rdma_slot_table_entries); |
f58851e6 TT |
336 | if (xprt == NULL) { |
337 | dprintk("RPC: %s: couldn't allocate rpcrdma_xprt\n", | |
338 | __func__); | |
339 | return ERR_PTR(-ENOMEM); | |
340 | } | |
341 | ||
f58851e6 | 342 | /* 60 second timeout, no retries */ |
ba7392bb | 343 | xprt->timeout = &xprt_rdma_default_timeout; |
bfaee096 CL |
344 | xprt->bind_timeout = RPCRDMA_BIND_TO; |
345 | xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO; | |
346 | xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO; | |
f58851e6 TT |
347 | |
348 | xprt->resvport = 0; /* privileged port not needed */ | |
349 | xprt->tsh_size = 0; /* RPC-RDMA handles framing */ | |
f58851e6 TT |
350 | xprt->ops = &xprt_rdma_procs; |
351 | ||
352 | /* | |
353 | * Set up RDMA-specific connect data. | |
354 | */ | |
dd229cee | 355 | sap = args->dstaddr; |
f58851e6 TT |
356 | |
357 | /* Ensure xprt->addr holds valid server TCP (not RDMA) | |
358 | * address, for any side protocols which peek at it */ | |
359 | xprt->prot = IPPROTO_TCP; | |
360 | xprt->addrlen = args->addrlen; | |
5231eb97 | 361 | memcpy(&xprt->addr, sap, xprt->addrlen); |
f58851e6 | 362 | |
5231eb97 | 363 | if (rpc_get_port(sap)) |
f58851e6 | 364 | xprt_set_bound(xprt); |
d461f1f2 | 365 | xprt_rdma_format_addresses(xprt, sap); |
f58851e6 | 366 | |
f58851e6 TT |
367 | cdata.max_requests = xprt->max_reqs; |
368 | ||
f58851e6 TT |
369 | cdata.rsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA write max */ |
370 | cdata.wsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA read max */ | |
371 | ||
372 | cdata.inline_wsize = xprt_rdma_max_inline_write; | |
373 | if (cdata.inline_wsize > cdata.wsize) | |
374 | cdata.inline_wsize = cdata.wsize; | |
375 | ||
376 | cdata.inline_rsize = xprt_rdma_max_inline_read; | |
377 | if (cdata.inline_rsize > cdata.rsize) | |
378 | cdata.inline_rsize = cdata.rsize; | |
379 | ||
f58851e6 TT |
380 | /* |
381 | * Create new transport instance, which includes initialized | |
382 | * o ia | |
383 | * o endpoint | |
384 | * o buffers | |
385 | */ | |
386 | ||
387 | new_xprt = rpcx_to_rdmax(xprt); | |
388 | ||
dd229cee | 389 | rc = rpcrdma_ia_open(new_xprt); |
f58851e6 TT |
390 | if (rc) |
391 | goto out1; | |
392 | ||
393 | /* | |
394 | * initialize and create ep | |
395 | */ | |
396 | new_xprt->rx_data = cdata; | |
397 | new_ep = &new_xprt->rx_ep; | |
f58851e6 TT |
398 | |
399 | rc = rpcrdma_ep_create(&new_xprt->rx_ep, | |
400 | &new_xprt->rx_ia, &new_xprt->rx_data); | |
401 | if (rc) | |
402 | goto out2; | |
403 | ||
ac920d04 | 404 | rc = rpcrdma_buffer_create(new_xprt); |
f58851e6 TT |
405 | if (rc) |
406 | goto out3; | |
407 | ||
5abefb86 CL |
408 | INIT_DELAYED_WORK(&new_xprt->rx_connect_worker, |
409 | xprt_rdma_connect_worker); | |
f58851e6 | 410 | |
1c9351ee CL |
411 | xprt->max_payload = new_xprt->rx_ia.ri_ops->ro_maxpages(new_xprt); |
412 | if (xprt->max_payload == 0) | |
413 | goto out4; | |
414 | xprt->max_payload <<= PAGE_SHIFT; | |
43e95988 CL |
415 | dprintk("RPC: %s: transport data payload maximum: %zu bytes\n", |
416 | __func__, xprt->max_payload); | |
f58851e6 TT |
417 | |
418 | if (!try_module_get(THIS_MODULE)) | |
419 | goto out4; | |
420 | ||
5231eb97 CL |
421 | dprintk("RPC: %s: %s:%s\n", __func__, |
422 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
423 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
b4744e00 | 424 | trace_xprtrdma_create(new_xprt); |
f58851e6 TT |
425 | return xprt; |
426 | ||
427 | out4: | |
03ac1a76 | 428 | rpcrdma_buffer_destroy(&new_xprt->rx_buf); |
03ac1a76 | 429 | rc = -ENODEV; |
f58851e6 | 430 | out3: |
7f1d5419 | 431 | rpcrdma_ep_destroy(new_ep, &new_xprt->rx_ia); |
f58851e6 TT |
432 | out2: |
433 | rpcrdma_ia_close(&new_xprt->rx_ia); | |
434 | out1: | |
b4744e00 | 435 | trace_xprtrdma_destroy(new_xprt); |
d461f1f2 | 436 | xprt_rdma_free_addresses(xprt); |
e204e621 | 437 | xprt_free(xprt); |
f58851e6 TT |
438 | return ERR_PTR(rc); |
439 | } | |
440 | ||
bebd0318 CL |
441 | /** |
442 | * xprt_rdma_close - Close down RDMA connection | |
443 | * @xprt: generic transport to be closed | |
444 | * | |
445 | * Called during transport shutdown reconnect, or device | |
446 | * removal. Caller holds the transport's write lock. | |
f58851e6 TT |
447 | */ |
448 | static void | |
449 | xprt_rdma_close(struct rpc_xprt *xprt) | |
450 | { | |
451 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); | |
bebd0318 CL |
452 | struct rpcrdma_ep *ep = &r_xprt->rx_ep; |
453 | struct rpcrdma_ia *ia = &r_xprt->rx_ia; | |
454 | ||
455 | dprintk("RPC: %s: closing xprt %p\n", __func__, xprt); | |
f58851e6 | 456 | |
bebd0318 CL |
457 | if (test_and_clear_bit(RPCRDMA_IAF_REMOVING, &ia->ri_flags)) { |
458 | xprt_clear_connected(xprt); | |
459 | rpcrdma_ia_remove(ia); | |
460 | return; | |
461 | } | |
462 | if (ep->rep_connected == -ENODEV) | |
463 | return; | |
464 | if (ep->rep_connected > 0) | |
08ca0dce | 465 | xprt->reestablish_timeout = 0; |
62da3b24 | 466 | xprt_disconnect_done(xprt); |
bebd0318 | 467 | rpcrdma_ep_disconnect(ep, ia); |
f58851e6 TT |
468 | } |
469 | ||
20035edf CL |
470 | /** |
471 | * xprt_rdma_set_port - update server port with rpcbind result | |
472 | * @xprt: controlling RPC transport | |
473 | * @port: new port value | |
474 | * | |
475 | * Transport connect status is unchanged. | |
476 | */ | |
f58851e6 TT |
477 | static void |
478 | xprt_rdma_set_port(struct rpc_xprt *xprt, u16 port) | |
479 | { | |
20035edf CL |
480 | struct sockaddr *sap = (struct sockaddr *)&xprt->addr; |
481 | char buf[8]; | |
482 | ||
483 | dprintk("RPC: %s: setting port for xprt %p (%s:%s) to %u\n", | |
484 | __func__, xprt, | |
485 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
486 | xprt->address_strings[RPC_DISPLAY_PORT], | |
487 | port); | |
488 | ||
489 | rpc_set_port(sap, port); | |
f58851e6 | 490 | |
20035edf CL |
491 | kfree(xprt->address_strings[RPC_DISPLAY_PORT]); |
492 | snprintf(buf, sizeof(buf), "%u", port); | |
493 | xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); | |
494 | ||
495 | kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); | |
496 | snprintf(buf, sizeof(buf), "%4hx", port); | |
497 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); | |
f58851e6 TT |
498 | } |
499 | ||
33849792 CL |
500 | /** |
501 | * xprt_rdma_timer - invoked when an RPC times out | |
502 | * @xprt: controlling RPC transport | |
503 | * @task: RPC task that timed out | |
504 | * | |
505 | * Invoked when the transport is still connected, but an RPC | |
506 | * retransmit timeout occurs. | |
507 | * | |
508 | * Since RDMA connections don't have a keep-alive, forcibly | |
509 | * disconnect and retry to connect. This drives full | |
510 | * detection of the network path, and retransmissions of | |
511 | * all pending RPCs. | |
512 | */ | |
513 | static void | |
514 | xprt_rdma_timer(struct rpc_xprt *xprt, struct rpc_task *task) | |
515 | { | |
33849792 CL |
516 | xprt_force_disconnect(xprt); |
517 | } | |
518 | ||
f58851e6 | 519 | static void |
1b092092 | 520 | xprt_rdma_connect(struct rpc_xprt *xprt, struct rpc_task *task) |
f58851e6 | 521 | { |
f58851e6 TT |
522 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); |
523 | ||
0b9e7943 TM |
524 | if (r_xprt->rx_ep.rep_connected != 0) { |
525 | /* Reconnect */ | |
5abefb86 CL |
526 | schedule_delayed_work(&r_xprt->rx_connect_worker, |
527 | xprt->reestablish_timeout); | |
0b9e7943 | 528 | xprt->reestablish_timeout <<= 1; |
bfaee096 CL |
529 | if (xprt->reestablish_timeout > RPCRDMA_MAX_REEST_TO) |
530 | xprt->reestablish_timeout = RPCRDMA_MAX_REEST_TO; | |
531 | else if (xprt->reestablish_timeout < RPCRDMA_INIT_REEST_TO) | |
532 | xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO; | |
0b9e7943 | 533 | } else { |
5abefb86 | 534 | schedule_delayed_work(&r_xprt->rx_connect_worker, 0); |
0b9e7943 | 535 | if (!RPC_IS_ASYNC(task)) |
5abefb86 | 536 | flush_delayed_work(&r_xprt->rx_connect_worker); |
f58851e6 TT |
537 | } |
538 | } | |
539 | ||
9c40c49f CL |
540 | static bool |
541 | rpcrdma_get_sendbuf(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req, | |
542 | size_t size, gfp_t flags) | |
543 | { | |
544 | struct rpcrdma_regbuf *rb; | |
9c40c49f CL |
545 | |
546 | if (req->rl_sendbuf && rdmab_length(req->rl_sendbuf) >= size) | |
547 | return true; | |
548 | ||
655fec69 | 549 | rb = rpcrdma_alloc_regbuf(size, DMA_TO_DEVICE, flags); |
9c40c49f CL |
550 | if (IS_ERR(rb)) |
551 | return false; | |
552 | ||
13650c23 | 553 | rpcrdma_free_regbuf(req->rl_sendbuf); |
655fec69 | 554 | r_xprt->rx_stats.hardway_register_count += size; |
9c40c49f CL |
555 | req->rl_sendbuf = rb; |
556 | return true; | |
557 | } | |
558 | ||
559 | /* The rq_rcv_buf is used only if a Reply chunk is necessary. | |
560 | * The decision to use a Reply chunk is made later in | |
561 | * rpcrdma_marshal_req. This buffer is registered at that time. | |
562 | * | |
563 | * Otherwise, the associated RPC Reply arrives in a separate | |
564 | * Receive buffer, arbitrarily chosen by the HCA. The buffer | |
565 | * allocated here for the RPC Reply is not utilized in that | |
566 | * case. See rpcrdma_inline_fixup. | |
567 | * | |
568 | * A regbuf is used here to remember the buffer size. | |
569 | */ | |
570 | static bool | |
571 | rpcrdma_get_recvbuf(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req, | |
572 | size_t size, gfp_t flags) | |
573 | { | |
574 | struct rpcrdma_regbuf *rb; | |
575 | ||
576 | if (req->rl_recvbuf && rdmab_length(req->rl_recvbuf) >= size) | |
577 | return true; | |
578 | ||
13650c23 | 579 | rb = rpcrdma_alloc_regbuf(size, DMA_NONE, flags); |
9c40c49f CL |
580 | if (IS_ERR(rb)) |
581 | return false; | |
582 | ||
13650c23 | 583 | rpcrdma_free_regbuf(req->rl_recvbuf); |
9c40c49f CL |
584 | r_xprt->rx_stats.hardway_register_count += size; |
585 | req->rl_recvbuf = rb; | |
586 | return true; | |
587 | } | |
588 | ||
5fe6eaa1 CL |
589 | /** |
590 | * xprt_rdma_allocate - allocate transport resources for an RPC | |
591 | * @task: RPC task | |
592 | * | |
593 | * Return values: | |
594 | * 0: Success; rq_buffer points to RPC buffer to use | |
595 | * ENOMEM: Out of memory, call again later | |
596 | * EIO: A permanent error occurred, do not retry | |
597 | * | |
f58851e6 | 598 | * The RDMA allocate/free functions need the task structure as a place |
9c40c49f CL |
599 | * to hide the struct rpcrdma_req, which is necessary for the actual |
600 | * send/recv sequence. | |
0ca77dc3 | 601 | * |
9c40c49f CL |
602 | * xprt_rdma_allocate provides buffers that are already mapped for |
603 | * DMA, and a local DMA lkey is provided for each. | |
f58851e6 | 604 | */ |
5fe6eaa1 CL |
605 | static int |
606 | xprt_rdma_allocate(struct rpc_task *task) | |
f58851e6 | 607 | { |
5fe6eaa1 | 608 | struct rpc_rqst *rqst = task->tk_rqstp; |
5fe6eaa1 | 609 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt); |
0ca77dc3 | 610 | struct rpcrdma_req *req; |
a0a1d50c | 611 | gfp_t flags; |
f58851e6 | 612 | |
0ca77dc3 | 613 | req = rpcrdma_buffer_get(&r_xprt->rx_buf); |
c977dea2 | 614 | if (req == NULL) |
ae724676 | 615 | goto out_get; |
f58851e6 | 616 | |
5d252f90 | 617 | flags = RPCRDMA_DEF_GFP; |
a0a1d50c CL |
618 | if (RPC_IS_SWAPPER(task)) |
619 | flags = __GFP_MEMALLOC | GFP_NOWAIT | __GFP_NOWARN; | |
620 | ||
9c40c49f CL |
621 | if (!rpcrdma_get_sendbuf(r_xprt, req, rqst->rq_callsize, flags)) |
622 | goto out_fail; | |
623 | if (!rpcrdma_get_recvbuf(r_xprt, req, rqst->rq_rcvsize, flags)) | |
624 | goto out_fail; | |
625 | ||
5a6d1db4 | 626 | rpcrdma_set_xprtdata(rqst, req); |
5fe6eaa1 | 627 | rqst->rq_buffer = req->rl_sendbuf->rg_base; |
9c40c49f | 628 | rqst->rq_rbuffer = req->rl_recvbuf->rg_base; |
ae724676 | 629 | trace_xprtrdma_allocate(task, req); |
5fe6eaa1 | 630 | return 0; |
0ca77dc3 | 631 | |
0ca77dc3 | 632 | out_fail: |
f58851e6 | 633 | rpcrdma_buffer_put(req); |
ae724676 CL |
634 | out_get: |
635 | trace_xprtrdma_allocate(task, NULL); | |
5fe6eaa1 | 636 | return -ENOMEM; |
f58851e6 TT |
637 | } |
638 | ||
3435c74a CL |
639 | /** |
640 | * xprt_rdma_free - release resources allocated by xprt_rdma_allocate | |
641 | * @task: RPC task | |
642 | * | |
643 | * Caller guarantees rqst->rq_buffer is non-NULL. | |
f58851e6 TT |
644 | */ |
645 | static void | |
3435c74a | 646 | xprt_rdma_free(struct rpc_task *task) |
f58851e6 | 647 | { |
3435c74a CL |
648 | struct rpc_rqst *rqst = task->tk_rqstp; |
649 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt); | |
650 | struct rpcrdma_req *req = rpcr_to_rdmar(rqst); | |
f58851e6 | 651 | |
0ba6f370 CL |
652 | if (test_bit(RPCRDMA_REQ_F_PENDING, &req->rl_flags)) |
653 | rpcrdma_release_rqst(r_xprt, req); | |
ae724676 | 654 | trace_xprtrdma_rpc_done(task, req); |
f58851e6 TT |
655 | rpcrdma_buffer_put(req); |
656 | } | |
657 | ||
7a89f9c6 CL |
658 | /** |
659 | * xprt_rdma_send_request - marshal and send an RPC request | |
660 | * @task: RPC task with an RPC message in rq_snd_buf | |
661 | * | |
bebd0318 CL |
662 | * Caller holds the transport's write lock. |
663 | * | |
cf73daf5 CL |
664 | * Returns: |
665 | * %0 if the RPC message has been sent | |
666 | * %-ENOTCONN if the caller should reconnect and call again | |
9e679d5e CL |
667 | * %-EAGAIN if the caller should call again |
668 | * %-ENOBUFS if the caller should call again after a delay | |
cf73daf5 CL |
669 | * %-EIO if a permanent error occurred and the request was not |
670 | * sent. Do not try to send this message again. | |
f58851e6 | 671 | */ |
f58851e6 TT |
672 | static int |
673 | xprt_rdma_send_request(struct rpc_task *task) | |
674 | { | |
675 | struct rpc_rqst *rqst = task->tk_rqstp; | |
a4f0835c | 676 | struct rpc_xprt *xprt = rqst->rq_xprt; |
f58851e6 TT |
677 | struct rpcrdma_req *req = rpcr_to_rdmar(rqst); |
678 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); | |
6ab59945 | 679 | int rc = 0; |
f58851e6 | 680 | |
cf73daf5 CL |
681 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
682 | if (unlikely(!rqst->rq_buffer)) | |
683 | return xprt_rdma_bc_send_reply(rqst); | |
684 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ | |
685 | ||
bebd0318 CL |
686 | if (!xprt_connected(xprt)) |
687 | goto drop_connection; | |
688 | ||
09e60641 | 689 | rc = rpcrdma_marshal_req(r_xprt, rqst); |
6ab59945 CL |
690 | if (rc < 0) |
691 | goto failed_marshal; | |
f58851e6 TT |
692 | |
693 | if (req->rl_reply == NULL) /* e.g. reconnection */ | |
694 | rpcrdma_recv_buffer_get(req); | |
695 | ||
575448bd | 696 | /* Must suppress retransmit to maintain credits */ |
8a14793e | 697 | if (rqst->rq_connect_cookie == xprt->connect_cookie) |
575448bd | 698 | goto drop_connection; |
78215759 | 699 | rqst->rq_xtime = ktime_get(); |
575448bd | 700 | |
42b9f5c5 | 701 | __set_bit(RPCRDMA_REQ_F_PENDING, &req->rl_flags); |
575448bd TT |
702 | if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req)) |
703 | goto drop_connection; | |
f58851e6 | 704 | |
d60dbb20 | 705 | rqst->rq_xmit_bytes_sent += rqst->rq_snd_buf.len; |
f58851e6 | 706 | rqst->rq_bytes_sent = 0; |
fb14ae88 CL |
707 | |
708 | /* An RPC with no reply will throw off credit accounting, | |
709 | * so drop the connection to reset the credit grant. | |
710 | */ | |
711 | if (!rpc_reply_expected(task)) | |
712 | goto drop_connection; | |
f58851e6 | 713 | return 0; |
575448bd | 714 | |
c93c6223 | 715 | failed_marshal: |
7a89f9c6 CL |
716 | if (rc != -ENOTCONN) |
717 | return rc; | |
575448bd TT |
718 | drop_connection: |
719 | xprt_disconnect_done(xprt); | |
720 | return -ENOTCONN; /* implies disconnect */ | |
f58851e6 TT |
721 | } |
722 | ||
5d252f90 | 723 | void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) |
f58851e6 TT |
724 | { |
725 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); | |
726 | long idle_time = 0; | |
727 | ||
728 | if (xprt_connected(xprt)) | |
729 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
730 | ||
763f7e4e CL |
731 | seq_puts(seq, "\txprt:\trdma "); |
732 | seq_printf(seq, "%u %lu %lu %lu %ld %lu %lu %lu %llu %llu ", | |
733 | 0, /* need a local port? */ | |
734 | xprt->stat.bind_count, | |
735 | xprt->stat.connect_count, | |
736 | xprt->stat.connect_time, | |
737 | idle_time, | |
738 | xprt->stat.sends, | |
739 | xprt->stat.recvs, | |
740 | xprt->stat.bad_xids, | |
741 | xprt->stat.req_u, | |
742 | xprt->stat.bklog_u); | |
505bbe64 | 743 | seq_printf(seq, "%lu %lu %lu %llu %llu %llu %llu %lu %lu %lu %lu ", |
763f7e4e CL |
744 | r_xprt->rx_stats.read_chunk_count, |
745 | r_xprt->rx_stats.write_chunk_count, | |
746 | r_xprt->rx_stats.reply_chunk_count, | |
747 | r_xprt->rx_stats.total_rdma_request, | |
748 | r_xprt->rx_stats.total_rdma_reply, | |
749 | r_xprt->rx_stats.pullup_copy_count, | |
750 | r_xprt->rx_stats.fixup_copy_count, | |
751 | r_xprt->rx_stats.hardway_register_count, | |
752 | r_xprt->rx_stats.failed_marshal_count, | |
860477d1 CL |
753 | r_xprt->rx_stats.bad_reply_count, |
754 | r_xprt->rx_stats.nomsg_call_count); | |
01bb35c8 | 755 | seq_printf(seq, "%lu %lu %lu %lu %lu %lu\n", |
505bbe64 | 756 | r_xprt->rx_stats.mrs_recovered, |
e2ac236c | 757 | r_xprt->rx_stats.mrs_orphaned, |
c8b920bb | 758 | r_xprt->rx_stats.mrs_allocated, |
ae72950a | 759 | r_xprt->rx_stats.local_inv_needed, |
01bb35c8 CL |
760 | r_xprt->rx_stats.empty_sendctx_q, |
761 | r_xprt->rx_stats.reply_waits_for_send); | |
f58851e6 TT |
762 | } |
763 | ||
d67fa4d8 JL |
764 | static int |
765 | xprt_rdma_enable_swap(struct rpc_xprt *xprt) | |
766 | { | |
a0451788 | 767 | return 0; |
d67fa4d8 JL |
768 | } |
769 | ||
770 | static void | |
771 | xprt_rdma_disable_swap(struct rpc_xprt *xprt) | |
772 | { | |
773 | } | |
774 | ||
f58851e6 TT |
775 | /* |
776 | * Plumbing for rpc transport switch and kernel module | |
777 | */ | |
778 | ||
d31ae254 | 779 | static const struct rpc_xprt_ops xprt_rdma_procs = { |
e7ce710a | 780 | .reserve_xprt = xprt_reserve_xprt_cong, |
f58851e6 | 781 | .release_xprt = xprt_release_xprt_cong, /* sunrpc/xprt.c */ |
f39c1bfb | 782 | .alloc_slot = xprt_alloc_slot, |
f58851e6 TT |
783 | .release_request = xprt_release_rqst_cong, /* ditto */ |
784 | .set_retrans_timeout = xprt_set_retrans_timeout_def, /* ditto */ | |
33849792 | 785 | .timer = xprt_rdma_timer, |
f58851e6 TT |
786 | .rpcbind = rpcb_getport_async, /* sunrpc/rpcb_clnt.c */ |
787 | .set_port = xprt_rdma_set_port, | |
788 | .connect = xprt_rdma_connect, | |
789 | .buf_alloc = xprt_rdma_allocate, | |
790 | .buf_free = xprt_rdma_free, | |
791 | .send_request = xprt_rdma_send_request, | |
792 | .close = xprt_rdma_close, | |
793 | .destroy = xprt_rdma_destroy, | |
d67fa4d8 JL |
794 | .print_stats = xprt_rdma_print_stats, |
795 | .enable_swap = xprt_rdma_enable_swap, | |
796 | .disable_swap = xprt_rdma_disable_swap, | |
f531a5db CL |
797 | .inject_disconnect = xprt_rdma_inject_disconnect, |
798 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) | |
799 | .bc_setup = xprt_rdma_bc_setup, | |
76566773 | 800 | .bc_up = xprt_rdma_bc_up, |
6b26cc8c | 801 | .bc_maxpayload = xprt_rdma_bc_maxpayload, |
f531a5db CL |
802 | .bc_free_rqst = xprt_rdma_bc_free_rqst, |
803 | .bc_destroy = xprt_rdma_bc_destroy, | |
804 | #endif | |
f58851e6 TT |
805 | }; |
806 | ||
807 | static struct xprt_class xprt_rdma = { | |
808 | .list = LIST_HEAD_INIT(xprt_rdma.list), | |
809 | .name = "rdma", | |
810 | .owner = THIS_MODULE, | |
811 | .ident = XPRT_TRANSPORT_RDMA, | |
812 | .setup = xprt_setup_rdma, | |
813 | }; | |
814 | ||
ffe1f0df | 815 | void xprt_rdma_cleanup(void) |
f58851e6 TT |
816 | { |
817 | int rc; | |
818 | ||
3a0799a9 | 819 | dprintk("RPCRDMA Module Removed, deregister RPC RDMA transport\n"); |
f895b252 | 820 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
f58851e6 TT |
821 | if (sunrpc_table_header) { |
822 | unregister_sysctl_table(sunrpc_table_header); | |
823 | sunrpc_table_header = NULL; | |
824 | } | |
825 | #endif | |
826 | rc = xprt_unregister_transport(&xprt_rdma); | |
827 | if (rc) | |
828 | dprintk("RPC: %s: xprt_unregister returned %i\n", | |
829 | __func__, rc); | |
951e721c | 830 | |
fe97b47c | 831 | rpcrdma_destroy_wq(); |
5d252f90 CL |
832 | |
833 | rc = xprt_unregister_transport(&xprt_rdma_bc); | |
834 | if (rc) | |
835 | dprintk("RPC: %s: xprt_unregister(bc) returned %i\n", | |
836 | __func__, rc); | |
f58851e6 TT |
837 | } |
838 | ||
ffe1f0df | 839 | int xprt_rdma_init(void) |
f58851e6 TT |
840 | { |
841 | int rc; | |
842 | ||
fe97b47c | 843 | rc = rpcrdma_alloc_wq(); |
505bbe64 | 844 | if (rc) |
fe97b47c | 845 | return rc; |
fe97b47c | 846 | |
951e721c CL |
847 | rc = xprt_register_transport(&xprt_rdma); |
848 | if (rc) { | |
fe97b47c | 849 | rpcrdma_destroy_wq(); |
951e721c CL |
850 | return rc; |
851 | } | |
852 | ||
5d252f90 CL |
853 | rc = xprt_register_transport(&xprt_rdma_bc); |
854 | if (rc) { | |
855 | xprt_unregister_transport(&xprt_rdma); | |
856 | rpcrdma_destroy_wq(); | |
5d252f90 CL |
857 | return rc; |
858 | } | |
859 | ||
3a0799a9 | 860 | dprintk("RPCRDMA Module Init, register RPC RDMA transport\n"); |
f58851e6 | 861 | |
3a0799a9 CL |
862 | dprintk("Defaults:\n"); |
863 | dprintk("\tSlots %d\n" | |
f58851e6 TT |
864 | "\tMaxInlineRead %d\n\tMaxInlineWrite %d\n", |
865 | xprt_rdma_slot_table_entries, | |
866 | xprt_rdma_max_inline_read, xprt_rdma_max_inline_write); | |
10492704 | 867 | dprintk("\tPadding 0\n\tMemreg %d\n", xprt_rdma_memreg_strategy); |
f58851e6 | 868 | |
f895b252 | 869 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
f58851e6 TT |
870 | if (!sunrpc_table_header) |
871 | sunrpc_table_header = register_sysctl_table(sunrpc_table); | |
872 | #endif | |
873 | return 0; | |
874 | } |