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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; | |
76 | static unsigned int zero; | |
77 | static unsigned int max_padding = PAGE_SIZE; | |
78 | static unsigned int min_memreg = RPCRDMA_BOUNCEBUFFERS; | |
79 | static unsigned int max_memreg = RPCRDMA_LAST - 1; | |
80 | ||
81 | static struct ctl_table_header *sunrpc_table_header; | |
82 | ||
fe2c6338 | 83 | static struct ctl_table xr_tunables_table[] = { |
f58851e6 | 84 | { |
f58851e6 TT |
85 | .procname = "rdma_slot_table_entries", |
86 | .data = &xprt_rdma_slot_table_entries, | |
87 | .maxlen = sizeof(unsigned int), | |
88 | .mode = 0644, | |
6d456111 | 89 | .proc_handler = proc_dointvec_minmax, |
f58851e6 TT |
90 | .extra1 = &min_slot_table_size, |
91 | .extra2 = &max_slot_table_size | |
92 | }, | |
93 | { | |
f58851e6 TT |
94 | .procname = "rdma_max_inline_read", |
95 | .data = &xprt_rdma_max_inline_read, | |
96 | .maxlen = sizeof(unsigned int), | |
97 | .mode = 0644, | |
6d456111 | 98 | .proc_handler = proc_dointvec, |
f58851e6 TT |
99 | }, |
100 | { | |
f58851e6 TT |
101 | .procname = "rdma_max_inline_write", |
102 | .data = &xprt_rdma_max_inline_write, | |
103 | .maxlen = sizeof(unsigned int), | |
104 | .mode = 0644, | |
6d456111 | 105 | .proc_handler = proc_dointvec, |
f58851e6 TT |
106 | }, |
107 | { | |
f58851e6 TT |
108 | .procname = "rdma_inline_write_padding", |
109 | .data = &xprt_rdma_inline_write_padding, | |
110 | .maxlen = sizeof(unsigned int), | |
111 | .mode = 0644, | |
6d456111 | 112 | .proc_handler = proc_dointvec_minmax, |
f58851e6 TT |
113 | .extra1 = &zero, |
114 | .extra2 = &max_padding, | |
115 | }, | |
116 | { | |
f58851e6 TT |
117 | .procname = "rdma_memreg_strategy", |
118 | .data = &xprt_rdma_memreg_strategy, | |
119 | .maxlen = sizeof(unsigned int), | |
120 | .mode = 0644, | |
6d456111 | 121 | .proc_handler = proc_dointvec_minmax, |
f58851e6 TT |
122 | .extra1 = &min_memreg, |
123 | .extra2 = &max_memreg, | |
124 | }, | |
9191ca3b | 125 | { |
9191ca3b TT |
126 | .procname = "rdma_pad_optimize", |
127 | .data = &xprt_rdma_pad_optimize, | |
128 | .maxlen = sizeof(unsigned int), | |
129 | .mode = 0644, | |
6d456111 | 130 | .proc_handler = proc_dointvec, |
9191ca3b | 131 | }, |
f8572d8f | 132 | { }, |
f58851e6 TT |
133 | }; |
134 | ||
fe2c6338 | 135 | static struct ctl_table sunrpc_table[] = { |
f58851e6 | 136 | { |
f58851e6 TT |
137 | .procname = "sunrpc", |
138 | .mode = 0555, | |
139 | .child = xr_tunables_table | |
140 | }, | |
f8572d8f | 141 | { }, |
f58851e6 TT |
142 | }; |
143 | ||
144 | #endif | |
145 | ||
5d252f90 | 146 | static struct rpc_xprt_ops xprt_rdma_procs; /*forward reference */ |
f58851e6 | 147 | |
0dd39cae CL |
148 | static void |
149 | xprt_rdma_format_addresses4(struct rpc_xprt *xprt, struct sockaddr *sap) | |
150 | { | |
151 | struct sockaddr_in *sin = (struct sockaddr_in *)sap; | |
152 | char buf[20]; | |
153 | ||
154 | snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); | |
155 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); | |
156 | ||
157 | xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA; | |
158 | } | |
159 | ||
160 | static void | |
161 | xprt_rdma_format_addresses6(struct rpc_xprt *xprt, struct sockaddr *sap) | |
162 | { | |
163 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; | |
164 | char buf[40]; | |
165 | ||
166 | snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); | |
167 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); | |
168 | ||
169 | xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA6; | |
170 | } | |
171 | ||
5d252f90 | 172 | void |
5231eb97 | 173 | xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap) |
f58851e6 | 174 | { |
0dd39cae CL |
175 | char buf[128]; |
176 | ||
177 | switch (sap->sa_family) { | |
178 | case AF_INET: | |
179 | xprt_rdma_format_addresses4(xprt, sap); | |
180 | break; | |
181 | case AF_INET6: | |
182 | xprt_rdma_format_addresses6(xprt, sap); | |
183 | break; | |
184 | default: | |
185 | pr_err("rpcrdma: Unrecognized address family\n"); | |
186 | return; | |
187 | } | |
f58851e6 | 188 | |
c877b849 CL |
189 | (void)rpc_ntop(sap, buf, sizeof(buf)); |
190 | xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL); | |
f58851e6 | 191 | |
81160e66 | 192 | snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); |
c877b849 | 193 | xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); |
f58851e6 | 194 | |
81160e66 | 195 | snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); |
c877b849 | 196 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); |
f58851e6 | 197 | |
0dd39cae | 198 | xprt->address_strings[RPC_DISPLAY_PROTO] = "rdma"; |
f58851e6 TT |
199 | } |
200 | ||
5d252f90 | 201 | void |
f58851e6 TT |
202 | xprt_rdma_free_addresses(struct rpc_xprt *xprt) |
203 | { | |
33e01dc7 CL |
204 | unsigned int i; |
205 | ||
206 | for (i = 0; i < RPC_DISPLAY_MAX; i++) | |
207 | switch (i) { | |
208 | case RPC_DISPLAY_PROTO: | |
209 | case RPC_DISPLAY_NETID: | |
210 | continue; | |
211 | default: | |
212 | kfree(xprt->address_strings[i]); | |
213 | } | |
f58851e6 TT |
214 | } |
215 | ||
216 | static void | |
217 | xprt_rdma_connect_worker(struct work_struct *work) | |
218 | { | |
5abefb86 CL |
219 | struct rpcrdma_xprt *r_xprt = container_of(work, struct rpcrdma_xprt, |
220 | rx_connect_worker.work); | |
221 | struct rpc_xprt *xprt = &r_xprt->rx_xprt; | |
f58851e6 TT |
222 | int rc = 0; |
223 | ||
d19751e7 TM |
224 | xprt_clear_connected(xprt); |
225 | ||
226 | dprintk("RPC: %s: %sconnect\n", __func__, | |
227 | r_xprt->rx_ep.rep_connected != 0 ? "re" : ""); | |
228 | rc = rpcrdma_ep_connect(&r_xprt->rx_ep, &r_xprt->rx_ia); | |
229 | if (rc) | |
230 | xprt_wake_pending_tasks(xprt, rc); | |
231 | ||
f58851e6 TT |
232 | dprintk("RPC: %s: exit\n", __func__); |
233 | xprt_clear_connecting(xprt); | |
234 | } | |
235 | ||
4a068258 CL |
236 | static void |
237 | xprt_rdma_inject_disconnect(struct rpc_xprt *xprt) | |
238 | { | |
239 | struct rpcrdma_xprt *r_xprt = container_of(xprt, struct rpcrdma_xprt, | |
240 | rx_xprt); | |
241 | ||
242 | pr_info("rpcrdma: injecting transport disconnect on xprt=%p\n", xprt); | |
243 | rdma_disconnect(r_xprt->rx_ia.ri_id); | |
244 | } | |
245 | ||
f58851e6 TT |
246 | /* |
247 | * xprt_rdma_destroy | |
248 | * | |
249 | * Destroy the xprt. | |
250 | * Free all memory associated with the object, including its own. | |
251 | * NOTE: none of the *destroy methods free memory for their top-level | |
252 | * objects, even though they may have allocated it (they do free | |
253 | * private memory). It's up to the caller to handle it. In this | |
254 | * case (RDMA transport), all structure memory is inlined with the | |
255 | * struct rpcrdma_xprt. | |
256 | */ | |
257 | static void | |
258 | xprt_rdma_destroy(struct rpc_xprt *xprt) | |
259 | { | |
260 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); | |
f58851e6 TT |
261 | |
262 | dprintk("RPC: %s: called\n", __func__); | |
263 | ||
5abefb86 | 264 | cancel_delayed_work_sync(&r_xprt->rx_connect_worker); |
f58851e6 TT |
265 | |
266 | xprt_clear_connected(xprt); | |
267 | ||
7f1d5419 | 268 | rpcrdma_ep_destroy(&r_xprt->rx_ep, &r_xprt->rx_ia); |
72c02173 | 269 | rpcrdma_buffer_destroy(&r_xprt->rx_buf); |
f58851e6 TT |
270 | rpcrdma_ia_close(&r_xprt->rx_ia); |
271 | ||
272 | xprt_rdma_free_addresses(xprt); | |
273 | ||
e204e621 | 274 | xprt_free(xprt); |
f58851e6 TT |
275 | |
276 | dprintk("RPC: %s: returning\n", __func__); | |
277 | ||
278 | module_put(THIS_MODULE); | |
279 | } | |
280 | ||
2881ae74 TM |
281 | static const struct rpc_timeout xprt_rdma_default_timeout = { |
282 | .to_initval = 60 * HZ, | |
283 | .to_maxval = 60 * HZ, | |
284 | }; | |
285 | ||
f58851e6 TT |
286 | /** |
287 | * xprt_setup_rdma - Set up transport to use RDMA | |
288 | * | |
289 | * @args: rpc transport arguments | |
290 | */ | |
291 | static struct rpc_xprt * | |
292 | xprt_setup_rdma(struct xprt_create *args) | |
293 | { | |
294 | struct rpcrdma_create_data_internal cdata; | |
295 | struct rpc_xprt *xprt; | |
296 | struct rpcrdma_xprt *new_xprt; | |
297 | struct rpcrdma_ep *new_ep; | |
5231eb97 | 298 | struct sockaddr *sap; |
f58851e6 TT |
299 | int rc; |
300 | ||
301 | if (args->addrlen > sizeof(xprt->addr)) { | |
302 | dprintk("RPC: %s: address too large\n", __func__); | |
303 | return ERR_PTR(-EBADF); | |
304 | } | |
305 | ||
37aa2133 | 306 | xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt), |
d9ba131d | 307 | xprt_rdma_slot_table_entries, |
bd1722d4 | 308 | xprt_rdma_slot_table_entries); |
f58851e6 TT |
309 | if (xprt == NULL) { |
310 | dprintk("RPC: %s: couldn't allocate rpcrdma_xprt\n", | |
311 | __func__); | |
312 | return ERR_PTR(-ENOMEM); | |
313 | } | |
314 | ||
f58851e6 | 315 | /* 60 second timeout, no retries */ |
ba7392bb | 316 | xprt->timeout = &xprt_rdma_default_timeout; |
bfaee096 CL |
317 | xprt->bind_timeout = RPCRDMA_BIND_TO; |
318 | xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO; | |
319 | xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO; | |
f58851e6 TT |
320 | |
321 | xprt->resvport = 0; /* privileged port not needed */ | |
322 | xprt->tsh_size = 0; /* RPC-RDMA handles framing */ | |
f58851e6 TT |
323 | xprt->ops = &xprt_rdma_procs; |
324 | ||
325 | /* | |
326 | * Set up RDMA-specific connect data. | |
327 | */ | |
328 | ||
5231eb97 CL |
329 | sap = (struct sockaddr *)&cdata.addr; |
330 | memcpy(sap, args->dstaddr, args->addrlen); | |
f58851e6 TT |
331 | |
332 | /* Ensure xprt->addr holds valid server TCP (not RDMA) | |
333 | * address, for any side protocols which peek at it */ | |
334 | xprt->prot = IPPROTO_TCP; | |
335 | xprt->addrlen = args->addrlen; | |
5231eb97 | 336 | memcpy(&xprt->addr, sap, xprt->addrlen); |
f58851e6 | 337 | |
5231eb97 | 338 | if (rpc_get_port(sap)) |
f58851e6 TT |
339 | xprt_set_bound(xprt); |
340 | ||
f58851e6 TT |
341 | cdata.max_requests = xprt->max_reqs; |
342 | ||
f58851e6 TT |
343 | cdata.rsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA write max */ |
344 | cdata.wsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA read max */ | |
345 | ||
346 | cdata.inline_wsize = xprt_rdma_max_inline_write; | |
347 | if (cdata.inline_wsize > cdata.wsize) | |
348 | cdata.inline_wsize = cdata.wsize; | |
349 | ||
350 | cdata.inline_rsize = xprt_rdma_max_inline_read; | |
351 | if (cdata.inline_rsize > cdata.rsize) | |
352 | cdata.inline_rsize = cdata.rsize; | |
353 | ||
354 | cdata.padding = xprt_rdma_inline_write_padding; | |
355 | ||
356 | /* | |
357 | * Create new transport instance, which includes initialized | |
358 | * o ia | |
359 | * o endpoint | |
360 | * o buffers | |
361 | */ | |
362 | ||
363 | new_xprt = rpcx_to_rdmax(xprt); | |
364 | ||
5231eb97 | 365 | rc = rpcrdma_ia_open(new_xprt, sap, xprt_rdma_memreg_strategy); |
f58851e6 TT |
366 | if (rc) |
367 | goto out1; | |
368 | ||
369 | /* | |
370 | * initialize and create ep | |
371 | */ | |
372 | new_xprt->rx_data = cdata; | |
373 | new_ep = &new_xprt->rx_ep; | |
374 | new_ep->rep_remote_addr = cdata.addr; | |
375 | ||
376 | rc = rpcrdma_ep_create(&new_xprt->rx_ep, | |
377 | &new_xprt->rx_ia, &new_xprt->rx_data); | |
378 | if (rc) | |
379 | goto out2; | |
380 | ||
381 | /* | |
382 | * Allocate pre-registered send and receive buffers for headers and | |
383 | * any inline data. Also specify any padding which will be provided | |
384 | * from a preregistered zero buffer. | |
385 | */ | |
ac920d04 | 386 | rc = rpcrdma_buffer_create(new_xprt); |
f58851e6 TT |
387 | if (rc) |
388 | goto out3; | |
389 | ||
390 | /* | |
391 | * Register a callback for connection events. This is necessary because | |
392 | * connection loss notification is async. We also catch connection loss | |
393 | * when reaping receives. | |
394 | */ | |
5abefb86 CL |
395 | INIT_DELAYED_WORK(&new_xprt->rx_connect_worker, |
396 | xprt_rdma_connect_worker); | |
f58851e6 | 397 | |
5231eb97 | 398 | xprt_rdma_format_addresses(xprt, sap); |
1c9351ee CL |
399 | xprt->max_payload = new_xprt->rx_ia.ri_ops->ro_maxpages(new_xprt); |
400 | if (xprt->max_payload == 0) | |
401 | goto out4; | |
402 | xprt->max_payload <<= PAGE_SHIFT; | |
43e95988 CL |
403 | dprintk("RPC: %s: transport data payload maximum: %zu bytes\n", |
404 | __func__, xprt->max_payload); | |
f58851e6 TT |
405 | |
406 | if (!try_module_get(THIS_MODULE)) | |
407 | goto out4; | |
408 | ||
5231eb97 CL |
409 | dprintk("RPC: %s: %s:%s\n", __func__, |
410 | xprt->address_strings[RPC_DISPLAY_ADDR], | |
411 | xprt->address_strings[RPC_DISPLAY_PORT]); | |
f58851e6 TT |
412 | return xprt; |
413 | ||
414 | out4: | |
415 | xprt_rdma_free_addresses(xprt); | |
416 | rc = -EINVAL; | |
417 | out3: | |
7f1d5419 | 418 | rpcrdma_ep_destroy(new_ep, &new_xprt->rx_ia); |
f58851e6 TT |
419 | out2: |
420 | rpcrdma_ia_close(&new_xprt->rx_ia); | |
421 | out1: | |
e204e621 | 422 | xprt_free(xprt); |
f58851e6 TT |
423 | return ERR_PTR(rc); |
424 | } | |
425 | ||
426 | /* | |
427 | * Close a connection, during shutdown or timeout/reconnect | |
428 | */ | |
429 | static void | |
430 | xprt_rdma_close(struct rpc_xprt *xprt) | |
431 | { | |
432 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); | |
433 | ||
434 | dprintk("RPC: %s: closing\n", __func__); | |
08ca0dce TT |
435 | if (r_xprt->rx_ep.rep_connected > 0) |
436 | xprt->reestablish_timeout = 0; | |
62da3b24 | 437 | xprt_disconnect_done(xprt); |
282191cb | 438 | rpcrdma_ep_disconnect(&r_xprt->rx_ep, &r_xprt->rx_ia); |
f58851e6 TT |
439 | } |
440 | ||
441 | static void | |
442 | xprt_rdma_set_port(struct rpc_xprt *xprt, u16 port) | |
443 | { | |
444 | struct sockaddr_in *sap; | |
445 | ||
446 | sap = (struct sockaddr_in *)&xprt->addr; | |
447 | sap->sin_port = htons(port); | |
448 | sap = (struct sockaddr_in *)&rpcx_to_rdmad(xprt).addr; | |
449 | sap->sin_port = htons(port); | |
450 | dprintk("RPC: %s: %u\n", __func__, port); | |
451 | } | |
452 | ||
453 | static void | |
1b092092 | 454 | xprt_rdma_connect(struct rpc_xprt *xprt, struct rpc_task *task) |
f58851e6 | 455 | { |
f58851e6 TT |
456 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); |
457 | ||
0b9e7943 TM |
458 | if (r_xprt->rx_ep.rep_connected != 0) { |
459 | /* Reconnect */ | |
5abefb86 CL |
460 | schedule_delayed_work(&r_xprt->rx_connect_worker, |
461 | xprt->reestablish_timeout); | |
0b9e7943 | 462 | xprt->reestablish_timeout <<= 1; |
bfaee096 CL |
463 | if (xprt->reestablish_timeout > RPCRDMA_MAX_REEST_TO) |
464 | xprt->reestablish_timeout = RPCRDMA_MAX_REEST_TO; | |
465 | else if (xprt->reestablish_timeout < RPCRDMA_INIT_REEST_TO) | |
466 | xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO; | |
0b9e7943 | 467 | } else { |
5abefb86 | 468 | schedule_delayed_work(&r_xprt->rx_connect_worker, 0); |
0b9e7943 | 469 | if (!RPC_IS_ASYNC(task)) |
5abefb86 | 470 | flush_delayed_work(&r_xprt->rx_connect_worker); |
f58851e6 TT |
471 | } |
472 | } | |
473 | ||
f58851e6 TT |
474 | /* |
475 | * The RDMA allocate/free functions need the task structure as a place | |
476 | * to hide the struct rpcrdma_req, which is necessary for the actual send/recv | |
0ca77dc3 CL |
477 | * sequence. |
478 | * | |
479 | * The RPC layer allocates both send and receive buffers in the same call | |
480 | * (rq_send_buf and rq_rcv_buf are both part of a single contiguous buffer). | |
481 | * We may register rq_rcv_buf when using reply chunks. | |
f58851e6 TT |
482 | */ |
483 | static void * | |
484 | xprt_rdma_allocate(struct rpc_task *task, size_t size) | |
485 | { | |
a4f0835c | 486 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
0ca77dc3 CL |
487 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); |
488 | struct rpcrdma_regbuf *rb; | |
489 | struct rpcrdma_req *req; | |
490 | size_t min_size; | |
a0a1d50c | 491 | gfp_t flags; |
f58851e6 | 492 | |
0ca77dc3 | 493 | req = rpcrdma_buffer_get(&r_xprt->rx_buf); |
c977dea2 CL |
494 | if (req == NULL) |
495 | return NULL; | |
f58851e6 | 496 | |
5d252f90 | 497 | flags = RPCRDMA_DEF_GFP; |
a0a1d50c CL |
498 | if (RPC_IS_SWAPPER(task)) |
499 | flags = __GFP_MEMALLOC | GFP_NOWAIT | __GFP_NOWARN; | |
500 | ||
85275c87 CL |
501 | if (req->rl_rdmabuf == NULL) |
502 | goto out_rdmabuf; | |
0ca77dc3 CL |
503 | if (req->rl_sendbuf == NULL) |
504 | goto out_sendbuf; | |
505 | if (size > req->rl_sendbuf->rg_size) | |
506 | goto out_sendbuf; | |
507 | ||
508 | out: | |
f58851e6 | 509 | dprintk("RPC: %s: size %zd, request 0x%p\n", __func__, size, req); |
575448bd | 510 | req->rl_connect_cookie = 0; /* our reserved value */ |
0ca77dc3 CL |
511 | return req->rl_sendbuf->rg_base; |
512 | ||
85275c87 CL |
513 | out_rdmabuf: |
514 | min_size = RPCRDMA_INLINE_WRITE_THRESHOLD(task->tk_rqstp); | |
515 | rb = rpcrdma_alloc_regbuf(&r_xprt->rx_ia, min_size, flags); | |
516 | if (IS_ERR(rb)) | |
517 | goto out_fail; | |
518 | req->rl_rdmabuf = rb; | |
519 | ||
0ca77dc3 CL |
520 | out_sendbuf: |
521 | /* XDR encoding and RPC/RDMA marshaling of this request has not | |
522 | * yet occurred. Thus a lower bound is needed to prevent buffer | |
523 | * overrun during marshaling. | |
524 | * | |
525 | * RPC/RDMA marshaling may choose to send payload bearing ops | |
526 | * inline, if the result is smaller than the inline threshold. | |
527 | * The value of the "size" argument accounts for header | |
528 | * requirements but not for the payload in these cases. | |
529 | * | |
530 | * Likewise, allocate enough space to receive a reply up to the | |
531 | * size of the inline threshold. | |
532 | * | |
533 | * It's unlikely that both the send header and the received | |
534 | * reply will be large, but slush is provided here to allow | |
535 | * flexibility when marshaling. | |
536 | */ | |
537 | min_size = RPCRDMA_INLINE_READ_THRESHOLD(task->tk_rqstp); | |
538 | min_size += RPCRDMA_INLINE_WRITE_THRESHOLD(task->tk_rqstp); | |
539 | if (size < min_size) | |
540 | size = min_size; | |
541 | ||
542 | rb = rpcrdma_alloc_regbuf(&r_xprt->rx_ia, size, flags); | |
543 | if (IS_ERR(rb)) | |
544 | goto out_fail; | |
545 | rb->rg_owner = req; | |
546 | ||
547 | r_xprt->rx_stats.hardway_register_count += size; | |
548 | rpcrdma_free_regbuf(&r_xprt->rx_ia, req->rl_sendbuf); | |
549 | req->rl_sendbuf = rb; | |
550 | goto out; | |
551 | ||
552 | out_fail: | |
f58851e6 | 553 | rpcrdma_buffer_put(req); |
0ca77dc3 | 554 | r_xprt->rx_stats.failed_marshal_count++; |
f58851e6 TT |
555 | return NULL; |
556 | } | |
557 | ||
558 | /* | |
559 | * This function returns all RDMA resources to the pool. | |
560 | */ | |
561 | static void | |
562 | xprt_rdma_free(void *buffer) | |
563 | { | |
564 | struct rpcrdma_req *req; | |
565 | struct rpcrdma_xprt *r_xprt; | |
0ca77dc3 | 566 | struct rpcrdma_regbuf *rb; |
f58851e6 TT |
567 | int i; |
568 | ||
569 | if (buffer == NULL) | |
570 | return; | |
571 | ||
0ca77dc3 CL |
572 | rb = container_of(buffer, struct rpcrdma_regbuf, rg_base[0]); |
573 | req = rb->rg_owner; | |
ffc4d9b1 CL |
574 | if (req->rl_backchannel) |
575 | return; | |
576 | ||
0ca77dc3 | 577 | r_xprt = container_of(req->rl_buffer, struct rpcrdma_xprt, rx_buf); |
f58851e6 | 578 | |
0ca77dc3 | 579 | dprintk("RPC: %s: called on 0x%p\n", __func__, req->rl_reply); |
f58851e6 | 580 | |
f58851e6 TT |
581 | for (i = 0; req->rl_nchunks;) { |
582 | --req->rl_nchunks; | |
6814baea CL |
583 | i += r_xprt->rx_ia.ri_ops->ro_unmap(r_xprt, |
584 | &req->rl_segments[i]); | |
f58851e6 TT |
585 | } |
586 | ||
f58851e6 TT |
587 | rpcrdma_buffer_put(req); |
588 | } | |
589 | ||
590 | /* | |
591 | * send_request invokes the meat of RPC RDMA. It must do the following: | |
592 | * 1. Marshal the RPC request into an RPC RDMA request, which means | |
593 | * putting a header in front of data, and creating IOVs for RDMA | |
594 | * from those in the request. | |
595 | * 2. In marshaling, detect opportunities for RDMA, and use them. | |
596 | * 3. Post a recv message to set up asynch completion, then send | |
597 | * the request (rpcrdma_ep_post). | |
598 | * 4. No partial sends are possible in the RPC-RDMA protocol (as in UDP). | |
599 | */ | |
600 | ||
601 | static int | |
602 | xprt_rdma_send_request(struct rpc_task *task) | |
603 | { | |
604 | struct rpc_rqst *rqst = task->tk_rqstp; | |
a4f0835c | 605 | struct rpc_xprt *xprt = rqst->rq_xprt; |
f58851e6 TT |
606 | struct rpcrdma_req *req = rpcr_to_rdmar(rqst); |
607 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); | |
6ab59945 | 608 | int rc = 0; |
f58851e6 | 609 | |
e2377945 | 610 | rc = rpcrdma_marshal_req(rqst); |
6ab59945 CL |
611 | if (rc < 0) |
612 | goto failed_marshal; | |
f58851e6 TT |
613 | |
614 | if (req->rl_reply == NULL) /* e.g. reconnection */ | |
615 | rpcrdma_recv_buffer_get(req); | |
616 | ||
575448bd TT |
617 | /* Must suppress retransmit to maintain credits */ |
618 | if (req->rl_connect_cookie == xprt->connect_cookie) | |
619 | goto drop_connection; | |
620 | req->rl_connect_cookie = xprt->connect_cookie; | |
621 | ||
622 | if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req)) | |
623 | goto drop_connection; | |
f58851e6 | 624 | |
d60dbb20 | 625 | rqst->rq_xmit_bytes_sent += rqst->rq_snd_buf.len; |
f58851e6 TT |
626 | rqst->rq_bytes_sent = 0; |
627 | return 0; | |
575448bd | 628 | |
c93c6223 CL |
629 | failed_marshal: |
630 | r_xprt->rx_stats.failed_marshal_count++; | |
631 | dprintk("RPC: %s: rpcrdma_marshal_req failed, status %i\n", | |
632 | __func__, rc); | |
633 | if (rc == -EIO) | |
634 | return -EIO; | |
575448bd TT |
635 | drop_connection: |
636 | xprt_disconnect_done(xprt); | |
637 | return -ENOTCONN; /* implies disconnect */ | |
f58851e6 TT |
638 | } |
639 | ||
5d252f90 | 640 | void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) |
f58851e6 TT |
641 | { |
642 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); | |
643 | long idle_time = 0; | |
644 | ||
645 | if (xprt_connected(xprt)) | |
646 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
647 | ||
763f7e4e CL |
648 | seq_puts(seq, "\txprt:\trdma "); |
649 | seq_printf(seq, "%u %lu %lu %lu %ld %lu %lu %lu %llu %llu ", | |
650 | 0, /* need a local port? */ | |
651 | xprt->stat.bind_count, | |
652 | xprt->stat.connect_count, | |
653 | xprt->stat.connect_time, | |
654 | idle_time, | |
655 | xprt->stat.sends, | |
656 | xprt->stat.recvs, | |
657 | xprt->stat.bad_xids, | |
658 | xprt->stat.req_u, | |
659 | xprt->stat.bklog_u); | |
860477d1 | 660 | seq_printf(seq, "%lu %lu %lu %llu %llu %llu %llu %lu %lu %lu %lu\n", |
763f7e4e CL |
661 | r_xprt->rx_stats.read_chunk_count, |
662 | r_xprt->rx_stats.write_chunk_count, | |
663 | r_xprt->rx_stats.reply_chunk_count, | |
664 | r_xprt->rx_stats.total_rdma_request, | |
665 | r_xprt->rx_stats.total_rdma_reply, | |
666 | r_xprt->rx_stats.pullup_copy_count, | |
667 | r_xprt->rx_stats.fixup_copy_count, | |
668 | r_xprt->rx_stats.hardway_register_count, | |
669 | r_xprt->rx_stats.failed_marshal_count, | |
860477d1 CL |
670 | r_xprt->rx_stats.bad_reply_count, |
671 | r_xprt->rx_stats.nomsg_call_count); | |
f58851e6 TT |
672 | } |
673 | ||
d67fa4d8 JL |
674 | static int |
675 | xprt_rdma_enable_swap(struct rpc_xprt *xprt) | |
676 | { | |
a0451788 | 677 | return 0; |
d67fa4d8 JL |
678 | } |
679 | ||
680 | static void | |
681 | xprt_rdma_disable_swap(struct rpc_xprt *xprt) | |
682 | { | |
683 | } | |
684 | ||
f58851e6 TT |
685 | /* |
686 | * Plumbing for rpc transport switch and kernel module | |
687 | */ | |
688 | ||
689 | static struct rpc_xprt_ops xprt_rdma_procs = { | |
e7ce710a | 690 | .reserve_xprt = xprt_reserve_xprt_cong, |
f58851e6 | 691 | .release_xprt = xprt_release_xprt_cong, /* sunrpc/xprt.c */ |
f39c1bfb | 692 | .alloc_slot = xprt_alloc_slot, |
f58851e6 TT |
693 | .release_request = xprt_release_rqst_cong, /* ditto */ |
694 | .set_retrans_timeout = xprt_set_retrans_timeout_def, /* ditto */ | |
695 | .rpcbind = rpcb_getport_async, /* sunrpc/rpcb_clnt.c */ | |
696 | .set_port = xprt_rdma_set_port, | |
697 | .connect = xprt_rdma_connect, | |
698 | .buf_alloc = xprt_rdma_allocate, | |
699 | .buf_free = xprt_rdma_free, | |
700 | .send_request = xprt_rdma_send_request, | |
701 | .close = xprt_rdma_close, | |
702 | .destroy = xprt_rdma_destroy, | |
d67fa4d8 JL |
703 | .print_stats = xprt_rdma_print_stats, |
704 | .enable_swap = xprt_rdma_enable_swap, | |
705 | .disable_swap = xprt_rdma_disable_swap, | |
f531a5db CL |
706 | .inject_disconnect = xprt_rdma_inject_disconnect, |
707 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) | |
708 | .bc_setup = xprt_rdma_bc_setup, | |
76566773 | 709 | .bc_up = xprt_rdma_bc_up, |
f531a5db CL |
710 | .bc_free_rqst = xprt_rdma_bc_free_rqst, |
711 | .bc_destroy = xprt_rdma_bc_destroy, | |
712 | #endif | |
f58851e6 TT |
713 | }; |
714 | ||
715 | static struct xprt_class xprt_rdma = { | |
716 | .list = LIST_HEAD_INIT(xprt_rdma.list), | |
717 | .name = "rdma", | |
718 | .owner = THIS_MODULE, | |
719 | .ident = XPRT_TRANSPORT_RDMA, | |
720 | .setup = xprt_setup_rdma, | |
721 | }; | |
722 | ||
ffe1f0df | 723 | void xprt_rdma_cleanup(void) |
f58851e6 TT |
724 | { |
725 | int rc; | |
726 | ||
3a0799a9 | 727 | dprintk("RPCRDMA Module Removed, deregister RPC RDMA transport\n"); |
f895b252 | 728 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
f58851e6 TT |
729 | if (sunrpc_table_header) { |
730 | unregister_sysctl_table(sunrpc_table_header); | |
731 | sunrpc_table_header = NULL; | |
732 | } | |
733 | #endif | |
734 | rc = xprt_unregister_transport(&xprt_rdma); | |
735 | if (rc) | |
736 | dprintk("RPC: %s: xprt_unregister returned %i\n", | |
737 | __func__, rc); | |
951e721c | 738 | |
fe97b47c | 739 | rpcrdma_destroy_wq(); |
951e721c | 740 | frwr_destroy_recovery_wq(); |
5d252f90 CL |
741 | |
742 | rc = xprt_unregister_transport(&xprt_rdma_bc); | |
743 | if (rc) | |
744 | dprintk("RPC: %s: xprt_unregister(bc) returned %i\n", | |
745 | __func__, rc); | |
f58851e6 TT |
746 | } |
747 | ||
ffe1f0df | 748 | int xprt_rdma_init(void) |
f58851e6 TT |
749 | { |
750 | int rc; | |
751 | ||
951e721c | 752 | rc = frwr_alloc_recovery_wq(); |
f58851e6 TT |
753 | if (rc) |
754 | return rc; | |
755 | ||
fe97b47c CL |
756 | rc = rpcrdma_alloc_wq(); |
757 | if (rc) { | |
758 | frwr_destroy_recovery_wq(); | |
759 | return rc; | |
760 | } | |
761 | ||
951e721c CL |
762 | rc = xprt_register_transport(&xprt_rdma); |
763 | if (rc) { | |
fe97b47c | 764 | rpcrdma_destroy_wq(); |
951e721c CL |
765 | frwr_destroy_recovery_wq(); |
766 | return rc; | |
767 | } | |
768 | ||
5d252f90 CL |
769 | rc = xprt_register_transport(&xprt_rdma_bc); |
770 | if (rc) { | |
771 | xprt_unregister_transport(&xprt_rdma); | |
772 | rpcrdma_destroy_wq(); | |
773 | frwr_destroy_recovery_wq(); | |
774 | return rc; | |
775 | } | |
776 | ||
3a0799a9 | 777 | dprintk("RPCRDMA Module Init, register RPC RDMA transport\n"); |
f58851e6 | 778 | |
3a0799a9 CL |
779 | dprintk("Defaults:\n"); |
780 | dprintk("\tSlots %d\n" | |
f58851e6 TT |
781 | "\tMaxInlineRead %d\n\tMaxInlineWrite %d\n", |
782 | xprt_rdma_slot_table_entries, | |
783 | xprt_rdma_max_inline_read, xprt_rdma_max_inline_write); | |
3a0799a9 | 784 | dprintk("\tPadding %d\n\tMemreg %d\n", |
f58851e6 TT |
785 | xprt_rdma_inline_write_padding, xprt_rdma_memreg_strategy); |
786 | ||
f895b252 | 787 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
f58851e6 TT |
788 | if (!sunrpc_table_header) |
789 | sunrpc_table_header = register_sysctl_table(sunrpc_table); | |
790 | #endif | |
791 | return 0; | |
792 | } |