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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/net/sunrpc/xprt.c | |
3 | * | |
4 | * This is a generic RPC call interface supporting congestion avoidance, | |
5 | * and asynchronous calls. | |
6 | * | |
7 | * The interface works like this: | |
8 | * | |
9 | * - When a process places a call, it allocates a request slot if | |
10 | * one is available. Otherwise, it sleeps on the backlog queue | |
11 | * (xprt_reserve). | |
12 | * - Next, the caller puts together the RPC message, stuffs it into | |
55aa4f58 CL |
13 | * the request struct, and calls xprt_transmit(). |
14 | * - xprt_transmit sends the message and installs the caller on the | |
55ae1aab RL |
15 | * transport's wait list. At the same time, if a reply is expected, |
16 | * it installs a timer that is run after the packet's timeout has | |
17 | * expired. | |
1da177e4 | 18 | * - When a packet arrives, the data_ready handler walks the list of |
55aa4f58 | 19 | * pending requests for that transport. If a matching XID is found, the |
1da177e4 LT |
20 | * caller is woken up, and the timer removed. |
21 | * - When no reply arrives within the timeout interval, the timer is | |
22 | * fired by the kernel and runs xprt_timer(). It either adjusts the | |
23 | * timeout values (minor timeout) or wakes up the caller with a status | |
24 | * of -ETIMEDOUT. | |
25 | * - When the caller receives a notification from RPC that a reply arrived, | |
26 | * it should release the RPC slot, and process the reply. | |
27 | * If the call timed out, it may choose to retry the operation by | |
28 | * adjusting the initial timeout value, and simply calling rpc_call | |
29 | * again. | |
30 | * | |
31 | * Support for async RPC is done through a set of RPC-specific scheduling | |
32 | * primitives that `transparently' work for processes as well as async | |
33 | * tasks that rely on callbacks. | |
34 | * | |
35 | * Copyright (C) 1995-1997, Olaf Kirch <okir@monad.swb.de> | |
55aa4f58 CL |
36 | * |
37 | * Transport switch API copyright (C) 2005, Chuck Lever <cel@netapp.com> | |
1da177e4 LT |
38 | */ |
39 | ||
a246b010 CL |
40 | #include <linux/module.h> |
41 | ||
1da177e4 | 42 | #include <linux/types.h> |
a246b010 | 43 | #include <linux/interrupt.h> |
1da177e4 | 44 | #include <linux/workqueue.h> |
bf3fcf89 | 45 | #include <linux/net.h> |
ff839970 | 46 | #include <linux/ktime.h> |
1da177e4 | 47 | |
a246b010 | 48 | #include <linux/sunrpc/clnt.h> |
11c556b3 | 49 | #include <linux/sunrpc/metrics.h> |
c9acb42e | 50 | #include <linux/sunrpc/bc_xprt.h> |
fda1bfef | 51 | #include <linux/rcupdate.h> |
1da177e4 | 52 | |
3705ad64 JL |
53 | #include <trace/events/sunrpc.h> |
54 | ||
55ae1aab RL |
55 | #include "sunrpc.h" |
56 | ||
1da177e4 LT |
57 | /* |
58 | * Local variables | |
59 | */ | |
60 | ||
f895b252 | 61 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
1da177e4 LT |
62 | # define RPCDBG_FACILITY RPCDBG_XPRT |
63 | #endif | |
64 | ||
1da177e4 LT |
65 | /* |
66 | * Local functions | |
67 | */ | |
21de0a95 | 68 | static void xprt_init(struct rpc_xprt *xprt, struct net *net); |
1da177e4 | 69 | static void xprt_request_init(struct rpc_task *, struct rpc_xprt *); |
1da177e4 | 70 | static void xprt_connect_status(struct rpc_task *task); |
1da177e4 | 71 | static int __xprt_get_cong(struct rpc_xprt *, struct rpc_task *); |
29807318 | 72 | static void __xprt_put_cong(struct rpc_xprt *, struct rpc_rqst *); |
4e0038b6 | 73 | static void xprt_destroy(struct rpc_xprt *xprt); |
1da177e4 | 74 | |
5ba03e82 | 75 | static DEFINE_SPINLOCK(xprt_list_lock); |
81c098af TT |
76 | static LIST_HEAD(xprt_list); |
77 | ||
81c098af TT |
78 | /** |
79 | * xprt_register_transport - register a transport implementation | |
80 | * @transport: transport to register | |
81 | * | |
82 | * If a transport implementation is loaded as a kernel module, it can | |
83 | * call this interface to make itself known to the RPC client. | |
84 | * | |
85 | * Returns: | |
86 | * 0: transport successfully registered | |
87 | * -EEXIST: transport already registered | |
88 | * -EINVAL: transport module being unloaded | |
89 | */ | |
90 | int xprt_register_transport(struct xprt_class *transport) | |
91 | { | |
92 | struct xprt_class *t; | |
93 | int result; | |
94 | ||
95 | result = -EEXIST; | |
96 | spin_lock(&xprt_list_lock); | |
97 | list_for_each_entry(t, &xprt_list, list) { | |
98 | /* don't register the same transport class twice */ | |
4fa016eb | 99 | if (t->ident == transport->ident) |
81c098af TT |
100 | goto out; |
101 | } | |
102 | ||
c9f6cde6 DL |
103 | list_add_tail(&transport->list, &xprt_list); |
104 | printk(KERN_INFO "RPC: Registered %s transport module.\n", | |
105 | transport->name); | |
106 | result = 0; | |
81c098af TT |
107 | |
108 | out: | |
109 | spin_unlock(&xprt_list_lock); | |
110 | return result; | |
111 | } | |
112 | EXPORT_SYMBOL_GPL(xprt_register_transport); | |
113 | ||
114 | /** | |
115 | * xprt_unregister_transport - unregister a transport implementation | |
65b6e42c | 116 | * @transport: transport to unregister |
81c098af TT |
117 | * |
118 | * Returns: | |
119 | * 0: transport successfully unregistered | |
120 | * -ENOENT: transport never registered | |
121 | */ | |
122 | int xprt_unregister_transport(struct xprt_class *transport) | |
123 | { | |
124 | struct xprt_class *t; | |
125 | int result; | |
126 | ||
127 | result = 0; | |
128 | spin_lock(&xprt_list_lock); | |
129 | list_for_each_entry(t, &xprt_list, list) { | |
130 | if (t == transport) { | |
131 | printk(KERN_INFO | |
132 | "RPC: Unregistered %s transport module.\n", | |
133 | transport->name); | |
134 | list_del_init(&transport->list); | |
81c098af TT |
135 | goto out; |
136 | } | |
137 | } | |
138 | result = -ENOENT; | |
139 | ||
140 | out: | |
141 | spin_unlock(&xprt_list_lock); | |
142 | return result; | |
143 | } | |
144 | EXPORT_SYMBOL_GPL(xprt_unregister_transport); | |
145 | ||
441e3e24 TT |
146 | /** |
147 | * xprt_load_transport - load a transport implementation | |
148 | * @transport_name: transport to load | |
149 | * | |
150 | * Returns: | |
151 | * 0: transport successfully loaded | |
152 | * -ENOENT: transport module not available | |
153 | */ | |
154 | int xprt_load_transport(const char *transport_name) | |
155 | { | |
156 | struct xprt_class *t; | |
441e3e24 TT |
157 | int result; |
158 | ||
159 | result = 0; | |
160 | spin_lock(&xprt_list_lock); | |
161 | list_for_each_entry(t, &xprt_list, list) { | |
162 | if (strcmp(t->name, transport_name) == 0) { | |
163 | spin_unlock(&xprt_list_lock); | |
164 | goto out; | |
165 | } | |
166 | } | |
167 | spin_unlock(&xprt_list_lock); | |
ef7ffe8f | 168 | result = request_module("xprt%s", transport_name); |
441e3e24 TT |
169 | out: |
170 | return result; | |
171 | } | |
172 | EXPORT_SYMBOL_GPL(xprt_load_transport); | |
173 | ||
12a80469 CL |
174 | /** |
175 | * xprt_reserve_xprt - serialize write access to transports | |
176 | * @task: task that is requesting access to the transport | |
177c27bf | 177 | * @xprt: pointer to the target transport |
12a80469 CL |
178 | * |
179 | * This prevents mixing the payload of separate requests, and prevents | |
180 | * transport connects from colliding with writes. No congestion control | |
181 | * is provided. | |
182 | */ | |
43cedbf0 | 183 | int xprt_reserve_xprt(struct rpc_xprt *xprt, struct rpc_task *task) |
12a80469 | 184 | { |
12a80469 | 185 | struct rpc_rqst *req = task->tk_rqstp; |
34006cee | 186 | int priority; |
12a80469 CL |
187 | |
188 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { | |
189 | if (task == xprt->snd_task) | |
190 | return 1; | |
12a80469 CL |
191 | goto out_sleep; |
192 | } | |
193 | xprt->snd_task = task; | |
92551948 | 194 | if (req != NULL) |
43cedbf0 | 195 | req->rq_ntrans++; |
4d4a76f3 | 196 | |
12a80469 CL |
197 | return 1; |
198 | ||
199 | out_sleep: | |
46121cf7 | 200 | dprintk("RPC: %5u failed to lock transport %p\n", |
12a80469 CL |
201 | task->tk_pid, xprt); |
202 | task->tk_timeout = 0; | |
203 | task->tk_status = -EAGAIN; | |
34006cee TM |
204 | if (req == NULL) |
205 | priority = RPC_PRIORITY_LOW; | |
206 | else if (!req->rq_ntrans) | |
207 | priority = RPC_PRIORITY_NORMAL; | |
12a80469 | 208 | else |
34006cee TM |
209 | priority = RPC_PRIORITY_HIGH; |
210 | rpc_sleep_on_priority(&xprt->sending, task, NULL, priority); | |
12a80469 CL |
211 | return 0; |
212 | } | |
12444809 | 213 | EXPORT_SYMBOL_GPL(xprt_reserve_xprt); |
12a80469 | 214 | |
632e3bdc TM |
215 | static void xprt_clear_locked(struct rpc_xprt *xprt) |
216 | { | |
217 | xprt->snd_task = NULL; | |
d19751e7 | 218 | if (!test_bit(XPRT_CLOSE_WAIT, &xprt->state)) { |
4e857c58 | 219 | smp_mb__before_atomic(); |
632e3bdc | 220 | clear_bit(XPRT_LOCKED, &xprt->state); |
4e857c58 | 221 | smp_mb__after_atomic(); |
632e3bdc | 222 | } else |
40a5f1b1 | 223 | queue_work(xprtiod_workqueue, &xprt->task_cleanup); |
632e3bdc TM |
224 | } |
225 | ||
1da177e4 | 226 | /* |
12a80469 CL |
227 | * xprt_reserve_xprt_cong - serialize write access to transports |
228 | * @task: task that is requesting access to the transport | |
229 | * | |
230 | * Same as xprt_reserve_xprt, but Van Jacobson congestion control is | |
231 | * integrated into the decision of whether a request is allowed to be | |
232 | * woken up and given access to the transport. | |
1da177e4 | 233 | */ |
43cedbf0 | 234 | int xprt_reserve_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task) |
1da177e4 LT |
235 | { |
236 | struct rpc_rqst *req = task->tk_rqstp; | |
34006cee | 237 | int priority; |
1da177e4 | 238 | |
2226feb6 | 239 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { |
1da177e4 LT |
240 | if (task == xprt->snd_task) |
241 | return 1; | |
1da177e4 LT |
242 | goto out_sleep; |
243 | } | |
43cedbf0 TM |
244 | if (req == NULL) { |
245 | xprt->snd_task = task; | |
246 | return 1; | |
247 | } | |
12a80469 | 248 | if (__xprt_get_cong(xprt, task)) { |
1da177e4 | 249 | xprt->snd_task = task; |
43cedbf0 | 250 | req->rq_ntrans++; |
1da177e4 LT |
251 | return 1; |
252 | } | |
632e3bdc | 253 | xprt_clear_locked(xprt); |
1da177e4 | 254 | out_sleep: |
29807318 NB |
255 | if (req) |
256 | __xprt_put_cong(xprt, req); | |
46121cf7 | 257 | dprintk("RPC: %5u failed to lock transport %p\n", task->tk_pid, xprt); |
1da177e4 LT |
258 | task->tk_timeout = 0; |
259 | task->tk_status = -EAGAIN; | |
34006cee TM |
260 | if (req == NULL) |
261 | priority = RPC_PRIORITY_LOW; | |
262 | else if (!req->rq_ntrans) | |
263 | priority = RPC_PRIORITY_NORMAL; | |
1da177e4 | 264 | else |
34006cee TM |
265 | priority = RPC_PRIORITY_HIGH; |
266 | rpc_sleep_on_priority(&xprt->sending, task, NULL, priority); | |
1da177e4 LT |
267 | return 0; |
268 | } | |
12444809 | 269 | EXPORT_SYMBOL_GPL(xprt_reserve_xprt_cong); |
1da177e4 | 270 | |
12a80469 | 271 | static inline int xprt_lock_write(struct rpc_xprt *xprt, struct rpc_task *task) |
1da177e4 LT |
272 | { |
273 | int retval; | |
274 | ||
4a0f8c04 | 275 | spin_lock_bh(&xprt->transport_lock); |
43cedbf0 | 276 | retval = xprt->ops->reserve_xprt(xprt, task); |
4a0f8c04 | 277 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 LT |
278 | return retval; |
279 | } | |
280 | ||
961a828d | 281 | static bool __xprt_lock_write_func(struct rpc_task *task, void *data) |
49e9a890 | 282 | { |
961a828d | 283 | struct rpc_xprt *xprt = data; |
49e9a890 CL |
284 | struct rpc_rqst *req; |
285 | ||
49e9a890 CL |
286 | req = task->tk_rqstp; |
287 | xprt->snd_task = task; | |
92551948 | 288 | if (req) |
49e9a890 | 289 | req->rq_ntrans++; |
961a828d TM |
290 | return true; |
291 | } | |
49e9a890 | 292 | |
961a828d TM |
293 | static void __xprt_lock_write_next(struct rpc_xprt *xprt) |
294 | { | |
295 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) | |
296 | return; | |
297 | ||
298 | if (rpc_wake_up_first(&xprt->sending, __xprt_lock_write_func, xprt)) | |
299 | return; | |
632e3bdc | 300 | xprt_clear_locked(xprt); |
49e9a890 CL |
301 | } |
302 | ||
961a828d | 303 | static bool __xprt_lock_write_cong_func(struct rpc_task *task, void *data) |
1da177e4 | 304 | { |
961a828d | 305 | struct rpc_xprt *xprt = data; |
43cedbf0 | 306 | struct rpc_rqst *req; |
1da177e4 | 307 | |
43cedbf0 TM |
308 | req = task->tk_rqstp; |
309 | if (req == NULL) { | |
310 | xprt->snd_task = task; | |
961a828d | 311 | return true; |
43cedbf0 | 312 | } |
49e9a890 | 313 | if (__xprt_get_cong(xprt, task)) { |
1da177e4 | 314 | xprt->snd_task = task; |
43cedbf0 | 315 | req->rq_ntrans++; |
961a828d | 316 | return true; |
1da177e4 | 317 | } |
961a828d TM |
318 | return false; |
319 | } | |
320 | ||
321 | static void __xprt_lock_write_next_cong(struct rpc_xprt *xprt) | |
322 | { | |
323 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) | |
324 | return; | |
325 | if (RPCXPRT_CONGESTED(xprt)) | |
326 | goto out_unlock; | |
327 | if (rpc_wake_up_first(&xprt->sending, __xprt_lock_write_cong_func, xprt)) | |
328 | return; | |
1da177e4 | 329 | out_unlock: |
632e3bdc | 330 | xprt_clear_locked(xprt); |
1da177e4 LT |
331 | } |
332 | ||
0695314e TM |
333 | static void xprt_task_clear_bytes_sent(struct rpc_task *task) |
334 | { | |
335 | if (task != NULL) { | |
336 | struct rpc_rqst *req = task->tk_rqstp; | |
337 | if (req != NULL) | |
338 | req->rq_bytes_sent = 0; | |
339 | } | |
340 | } | |
341 | ||
49e9a890 CL |
342 | /** |
343 | * xprt_release_xprt - allow other requests to use a transport | |
344 | * @xprt: transport with other tasks potentially waiting | |
345 | * @task: task that is releasing access to the transport | |
346 | * | |
347 | * Note that "task" can be NULL. No congestion control is provided. | |
1da177e4 | 348 | */ |
49e9a890 | 349 | void xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) |
1da177e4 LT |
350 | { |
351 | if (xprt->snd_task == task) { | |
0695314e | 352 | xprt_task_clear_bytes_sent(task); |
632e3bdc | 353 | xprt_clear_locked(xprt); |
1da177e4 LT |
354 | __xprt_lock_write_next(xprt); |
355 | } | |
356 | } | |
12444809 | 357 | EXPORT_SYMBOL_GPL(xprt_release_xprt); |
1da177e4 | 358 | |
49e9a890 CL |
359 | /** |
360 | * xprt_release_xprt_cong - allow other requests to use a transport | |
361 | * @xprt: transport with other tasks potentially waiting | |
362 | * @task: task that is releasing access to the transport | |
363 | * | |
364 | * Note that "task" can be NULL. Another task is awoken to use the | |
365 | * transport if the transport's congestion window allows it. | |
366 | */ | |
367 | void xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task) | |
368 | { | |
369 | if (xprt->snd_task == task) { | |
0695314e | 370 | xprt_task_clear_bytes_sent(task); |
632e3bdc | 371 | xprt_clear_locked(xprt); |
49e9a890 CL |
372 | __xprt_lock_write_next_cong(xprt); |
373 | } | |
374 | } | |
12444809 | 375 | EXPORT_SYMBOL_GPL(xprt_release_xprt_cong); |
49e9a890 CL |
376 | |
377 | static inline void xprt_release_write(struct rpc_xprt *xprt, struct rpc_task *task) | |
1da177e4 | 378 | { |
4a0f8c04 | 379 | spin_lock_bh(&xprt->transport_lock); |
49e9a890 | 380 | xprt->ops->release_xprt(xprt, task); |
4a0f8c04 | 381 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 LT |
382 | } |
383 | ||
1da177e4 LT |
384 | /* |
385 | * Van Jacobson congestion avoidance. Check if the congestion window | |
386 | * overflowed. Put the task to sleep if this is the case. | |
387 | */ | |
388 | static int | |
389 | __xprt_get_cong(struct rpc_xprt *xprt, struct rpc_task *task) | |
390 | { | |
391 | struct rpc_rqst *req = task->tk_rqstp; | |
392 | ||
393 | if (req->rq_cong) | |
394 | return 1; | |
46121cf7 | 395 | dprintk("RPC: %5u xprt_cwnd_limited cong = %lu cwnd = %lu\n", |
1da177e4 LT |
396 | task->tk_pid, xprt->cong, xprt->cwnd); |
397 | if (RPCXPRT_CONGESTED(xprt)) | |
398 | return 0; | |
399 | req->rq_cong = 1; | |
400 | xprt->cong += RPC_CWNDSCALE; | |
401 | return 1; | |
402 | } | |
403 | ||
404 | /* | |
405 | * Adjust the congestion window, and wake up the next task | |
406 | * that has been sleeping due to congestion | |
407 | */ | |
408 | static void | |
409 | __xprt_put_cong(struct rpc_xprt *xprt, struct rpc_rqst *req) | |
410 | { | |
411 | if (!req->rq_cong) | |
412 | return; | |
413 | req->rq_cong = 0; | |
414 | xprt->cong -= RPC_CWNDSCALE; | |
49e9a890 | 415 | __xprt_lock_write_next_cong(xprt); |
1da177e4 LT |
416 | } |
417 | ||
a58dd398 CL |
418 | /** |
419 | * xprt_release_rqst_cong - housekeeping when request is complete | |
420 | * @task: RPC request that recently completed | |
421 | * | |
422 | * Useful for transports that require congestion control. | |
423 | */ | |
424 | void xprt_release_rqst_cong(struct rpc_task *task) | |
425 | { | |
a4f0835c TM |
426 | struct rpc_rqst *req = task->tk_rqstp; |
427 | ||
428 | __xprt_put_cong(req->rq_xprt, req); | |
a58dd398 | 429 | } |
12444809 | 430 | EXPORT_SYMBOL_GPL(xprt_release_rqst_cong); |
a58dd398 | 431 | |
46c0ee8b CL |
432 | /** |
433 | * xprt_adjust_cwnd - adjust transport congestion window | |
6a24dfb6 | 434 | * @xprt: pointer to xprt |
46c0ee8b CL |
435 | * @task: recently completed RPC request used to adjust window |
436 | * @result: result code of completed RPC request | |
437 | * | |
4f4cf5ad CL |
438 | * The transport code maintains an estimate on the maximum number of out- |
439 | * standing RPC requests, using a smoothed version of the congestion | |
440 | * avoidance implemented in 44BSD. This is basically the Van Jacobson | |
441 | * congestion algorithm: If a retransmit occurs, the congestion window is | |
442 | * halved; otherwise, it is incremented by 1/cwnd when | |
443 | * | |
444 | * - a reply is received and | |
445 | * - a full number of requests are outstanding and | |
446 | * - the congestion window hasn't been updated recently. | |
1da177e4 | 447 | */ |
6a24dfb6 | 448 | void xprt_adjust_cwnd(struct rpc_xprt *xprt, struct rpc_task *task, int result) |
1da177e4 | 449 | { |
46c0ee8b | 450 | struct rpc_rqst *req = task->tk_rqstp; |
46c0ee8b | 451 | unsigned long cwnd = xprt->cwnd; |
1da177e4 | 452 | |
1da177e4 LT |
453 | if (result >= 0 && cwnd <= xprt->cong) { |
454 | /* The (cwnd >> 1) term makes sure | |
455 | * the result gets rounded properly. */ | |
456 | cwnd += (RPC_CWNDSCALE * RPC_CWNDSCALE + (cwnd >> 1)) / cwnd; | |
457 | if (cwnd > RPC_MAXCWND(xprt)) | |
458 | cwnd = RPC_MAXCWND(xprt); | |
49e9a890 | 459 | __xprt_lock_write_next_cong(xprt); |
1da177e4 LT |
460 | } else if (result == -ETIMEDOUT) { |
461 | cwnd >>= 1; | |
462 | if (cwnd < RPC_CWNDSCALE) | |
463 | cwnd = RPC_CWNDSCALE; | |
464 | } | |
46121cf7 | 465 | dprintk("RPC: cong %ld, cwnd was %ld, now %ld\n", |
1da177e4 LT |
466 | xprt->cong, xprt->cwnd, cwnd); |
467 | xprt->cwnd = cwnd; | |
46c0ee8b | 468 | __xprt_put_cong(xprt, req); |
1da177e4 | 469 | } |
12444809 | 470 | EXPORT_SYMBOL_GPL(xprt_adjust_cwnd); |
1da177e4 | 471 | |
44fbac22 CL |
472 | /** |
473 | * xprt_wake_pending_tasks - wake all tasks on a transport's pending queue | |
474 | * @xprt: transport with waiting tasks | |
475 | * @status: result code to plant in each task before waking it | |
476 | * | |
477 | */ | |
478 | void xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status) | |
479 | { | |
480 | if (status < 0) | |
481 | rpc_wake_up_status(&xprt->pending, status); | |
482 | else | |
483 | rpc_wake_up(&xprt->pending); | |
484 | } | |
12444809 | 485 | EXPORT_SYMBOL_GPL(xprt_wake_pending_tasks); |
44fbac22 | 486 | |
c7b2cae8 CL |
487 | /** |
488 | * xprt_wait_for_buffer_space - wait for transport output buffer to clear | |
489 | * @task: task to be put to sleep | |
0b80ae42 | 490 | * @action: function pointer to be executed after wait |
a9a6b52e TM |
491 | * |
492 | * Note that we only set the timer for the case of RPC_IS_SOFT(), since | |
493 | * we don't in general want to force a socket disconnection due to | |
494 | * an incomplete RPC call transmission. | |
c7b2cae8 | 495 | */ |
b6ddf64f | 496 | void xprt_wait_for_buffer_space(struct rpc_task *task, rpc_action action) |
c7b2cae8 CL |
497 | { |
498 | struct rpc_rqst *req = task->tk_rqstp; | |
499 | struct rpc_xprt *xprt = req->rq_xprt; | |
500 | ||
a9a6b52e | 501 | task->tk_timeout = RPC_IS_SOFT(task) ? req->rq_timeout : 0; |
b6ddf64f | 502 | rpc_sleep_on(&xprt->pending, task, action); |
c7b2cae8 | 503 | } |
12444809 | 504 | EXPORT_SYMBOL_GPL(xprt_wait_for_buffer_space); |
c7b2cae8 CL |
505 | |
506 | /** | |
507 | * xprt_write_space - wake the task waiting for transport output buffer space | |
508 | * @xprt: transport with waiting tasks | |
509 | * | |
510 | * Can be called in a soft IRQ context, so xprt_write_space never sleeps. | |
511 | */ | |
512 | void xprt_write_space(struct rpc_xprt *xprt) | |
513 | { | |
c7b2cae8 CL |
514 | spin_lock_bh(&xprt->transport_lock); |
515 | if (xprt->snd_task) { | |
46121cf7 CL |
516 | dprintk("RPC: write space: waking waiting task on " |
517 | "xprt %p\n", xprt); | |
fda13939 | 518 | rpc_wake_up_queued_task(&xprt->pending, xprt->snd_task); |
c7b2cae8 CL |
519 | } |
520 | spin_unlock_bh(&xprt->transport_lock); | |
521 | } | |
12444809 | 522 | EXPORT_SYMBOL_GPL(xprt_write_space); |
c7b2cae8 | 523 | |
fe3aca29 CL |
524 | /** |
525 | * xprt_set_retrans_timeout_def - set a request's retransmit timeout | |
526 | * @task: task whose timeout is to be set | |
527 | * | |
528 | * Set a request's retransmit timeout based on the transport's | |
529 | * default timeout parameters. Used by transports that don't adjust | |
530 | * the retransmit timeout based on round-trip time estimation. | |
531 | */ | |
532 | void xprt_set_retrans_timeout_def(struct rpc_task *task) | |
533 | { | |
534 | task->tk_timeout = task->tk_rqstp->rq_timeout; | |
535 | } | |
12444809 | 536 | EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_def); |
fe3aca29 | 537 | |
2c53040f | 538 | /** |
fe3aca29 CL |
539 | * xprt_set_retrans_timeout_rtt - set a request's retransmit timeout |
540 | * @task: task whose timeout is to be set | |
cca5172a | 541 | * |
fe3aca29 CL |
542 | * Set a request's retransmit timeout using the RTT estimator. |
543 | */ | |
544 | void xprt_set_retrans_timeout_rtt(struct rpc_task *task) | |
545 | { | |
546 | int timer = task->tk_msg.rpc_proc->p_timer; | |
ba7392bb TM |
547 | struct rpc_clnt *clnt = task->tk_client; |
548 | struct rpc_rtt *rtt = clnt->cl_rtt; | |
fe3aca29 | 549 | struct rpc_rqst *req = task->tk_rqstp; |
ba7392bb | 550 | unsigned long max_timeout = clnt->cl_timeout->to_maxval; |
fe3aca29 CL |
551 | |
552 | task->tk_timeout = rpc_calc_rto(rtt, timer); | |
553 | task->tk_timeout <<= rpc_ntimeo(rtt, timer) + req->rq_retries; | |
554 | if (task->tk_timeout > max_timeout || task->tk_timeout == 0) | |
555 | task->tk_timeout = max_timeout; | |
556 | } | |
12444809 | 557 | EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_rtt); |
fe3aca29 | 558 | |
1da177e4 LT |
559 | static void xprt_reset_majortimeo(struct rpc_rqst *req) |
560 | { | |
ba7392bb | 561 | const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout; |
1da177e4 LT |
562 | |
563 | req->rq_majortimeo = req->rq_timeout; | |
564 | if (to->to_exponential) | |
565 | req->rq_majortimeo <<= to->to_retries; | |
566 | else | |
567 | req->rq_majortimeo += to->to_increment * to->to_retries; | |
568 | if (req->rq_majortimeo > to->to_maxval || req->rq_majortimeo == 0) | |
569 | req->rq_majortimeo = to->to_maxval; | |
570 | req->rq_majortimeo += jiffies; | |
571 | } | |
572 | ||
9903cd1c CL |
573 | /** |
574 | * xprt_adjust_timeout - adjust timeout values for next retransmit | |
575 | * @req: RPC request containing parameters to use for the adjustment | |
576 | * | |
1da177e4 LT |
577 | */ |
578 | int xprt_adjust_timeout(struct rpc_rqst *req) | |
579 | { | |
580 | struct rpc_xprt *xprt = req->rq_xprt; | |
ba7392bb | 581 | const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout; |
1da177e4 LT |
582 | int status = 0; |
583 | ||
584 | if (time_before(jiffies, req->rq_majortimeo)) { | |
585 | if (to->to_exponential) | |
586 | req->rq_timeout <<= 1; | |
587 | else | |
588 | req->rq_timeout += to->to_increment; | |
589 | if (to->to_maxval && req->rq_timeout >= to->to_maxval) | |
590 | req->rq_timeout = to->to_maxval; | |
591 | req->rq_retries++; | |
1da177e4 LT |
592 | } else { |
593 | req->rq_timeout = to->to_initval; | |
594 | req->rq_retries = 0; | |
595 | xprt_reset_majortimeo(req); | |
596 | /* Reset the RTT counters == "slow start" */ | |
4a0f8c04 | 597 | spin_lock_bh(&xprt->transport_lock); |
1da177e4 | 598 | rpc_init_rtt(req->rq_task->tk_client->cl_rtt, to->to_initval); |
4a0f8c04 | 599 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 LT |
600 | status = -ETIMEDOUT; |
601 | } | |
602 | ||
603 | if (req->rq_timeout == 0) { | |
604 | printk(KERN_WARNING "xprt_adjust_timeout: rq_timeout = 0!\n"); | |
605 | req->rq_timeout = 5 * HZ; | |
606 | } | |
607 | return status; | |
608 | } | |
609 | ||
65f27f38 | 610 | static void xprt_autoclose(struct work_struct *work) |
1da177e4 | 611 | { |
65f27f38 DH |
612 | struct rpc_xprt *xprt = |
613 | container_of(work, struct rpc_xprt, task_cleanup); | |
1da177e4 | 614 | |
66af1e55 | 615 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
4876cc77 | 616 | xprt->ops->close(xprt); |
1da177e4 | 617 | xprt_release_write(xprt, NULL); |
79234c3d | 618 | wake_up_bit(&xprt->state, XPRT_LOCKED); |
1da177e4 LT |
619 | } |
620 | ||
9903cd1c | 621 | /** |
62da3b24 | 622 | * xprt_disconnect_done - mark a transport as disconnected |
9903cd1c CL |
623 | * @xprt: transport to flag for disconnect |
624 | * | |
1da177e4 | 625 | */ |
62da3b24 | 626 | void xprt_disconnect_done(struct rpc_xprt *xprt) |
1da177e4 | 627 | { |
46121cf7 | 628 | dprintk("RPC: disconnected transport %p\n", xprt); |
4a0f8c04 | 629 | spin_lock_bh(&xprt->transport_lock); |
1da177e4 | 630 | xprt_clear_connected(xprt); |
2a491991 | 631 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
4a0f8c04 | 632 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 | 633 | } |
62da3b24 | 634 | EXPORT_SYMBOL_GPL(xprt_disconnect_done); |
1da177e4 | 635 | |
66af1e55 TM |
636 | /** |
637 | * xprt_force_disconnect - force a transport to disconnect | |
638 | * @xprt: transport to disconnect | |
639 | * | |
640 | */ | |
641 | void xprt_force_disconnect(struct rpc_xprt *xprt) | |
642 | { | |
643 | /* Don't race with the test_bit() in xprt_clear_locked() */ | |
644 | spin_lock_bh(&xprt->transport_lock); | |
645 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
646 | /* Try to schedule an autoclose RPC call */ | |
647 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) | |
40a5f1b1 | 648 | queue_work(xprtiod_workqueue, &xprt->task_cleanup); |
2a491991 | 649 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
66af1e55 TM |
650 | spin_unlock_bh(&xprt->transport_lock); |
651 | } | |
66af1e55 | 652 | |
7c1d71cf TM |
653 | /** |
654 | * xprt_conditional_disconnect - force a transport to disconnect | |
655 | * @xprt: transport to disconnect | |
656 | * @cookie: 'connection cookie' | |
657 | * | |
658 | * This attempts to break the connection if and only if 'cookie' matches | |
659 | * the current transport 'connection cookie'. It ensures that we don't | |
660 | * try to break the connection more than once when we need to retransmit | |
661 | * a batch of RPC requests. | |
662 | * | |
663 | */ | |
664 | void xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie) | |
665 | { | |
666 | /* Don't race with the test_bit() in xprt_clear_locked() */ | |
667 | spin_lock_bh(&xprt->transport_lock); | |
668 | if (cookie != xprt->connect_cookie) | |
669 | goto out; | |
670 | if (test_bit(XPRT_CLOSING, &xprt->state) || !xprt_connected(xprt)) | |
671 | goto out; | |
672 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
673 | /* Try to schedule an autoclose RPC call */ | |
674 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) | |
40a5f1b1 | 675 | queue_work(xprtiod_workqueue, &xprt->task_cleanup); |
2a491991 | 676 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
7c1d71cf TM |
677 | out: |
678 | spin_unlock_bh(&xprt->transport_lock); | |
679 | } | |
680 | ||
1da177e4 LT |
681 | static void |
682 | xprt_init_autodisconnect(unsigned long data) | |
683 | { | |
684 | struct rpc_xprt *xprt = (struct rpc_xprt *)data; | |
685 | ||
4a0f8c04 | 686 | spin_lock(&xprt->transport_lock); |
d19751e7 | 687 | if (!list_empty(&xprt->recv)) |
1da177e4 | 688 | goto out_abort; |
2226feb6 | 689 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) |
1da177e4 | 690 | goto out_abort; |
4a0f8c04 | 691 | spin_unlock(&xprt->transport_lock); |
40a5f1b1 | 692 | queue_work(xprtiod_workqueue, &xprt->task_cleanup); |
1da177e4 LT |
693 | return; |
694 | out_abort: | |
4a0f8c04 | 695 | spin_unlock(&xprt->transport_lock); |
1da177e4 LT |
696 | } |
697 | ||
718ba5b8 TM |
698 | bool xprt_lock_connect(struct rpc_xprt *xprt, |
699 | struct rpc_task *task, | |
700 | void *cookie) | |
701 | { | |
702 | bool ret = false; | |
703 | ||
704 | spin_lock_bh(&xprt->transport_lock); | |
705 | if (!test_bit(XPRT_LOCKED, &xprt->state)) | |
706 | goto out; | |
707 | if (xprt->snd_task != task) | |
708 | goto out; | |
0695314e | 709 | xprt_task_clear_bytes_sent(task); |
718ba5b8 TM |
710 | xprt->snd_task = cookie; |
711 | ret = true; | |
712 | out: | |
713 | spin_unlock_bh(&xprt->transport_lock); | |
714 | return ret; | |
715 | } | |
716 | ||
717 | void xprt_unlock_connect(struct rpc_xprt *xprt, void *cookie) | |
718 | { | |
719 | spin_lock_bh(&xprt->transport_lock); | |
720 | if (xprt->snd_task != cookie) | |
721 | goto out; | |
722 | if (!test_bit(XPRT_LOCKED, &xprt->state)) | |
723 | goto out; | |
724 | xprt->snd_task =NULL; | |
725 | xprt->ops->release_xprt(xprt, NULL); | |
726 | out: | |
727 | spin_unlock_bh(&xprt->transport_lock); | |
79234c3d | 728 | wake_up_bit(&xprt->state, XPRT_LOCKED); |
718ba5b8 TM |
729 | } |
730 | ||
9903cd1c CL |
731 | /** |
732 | * xprt_connect - schedule a transport connect operation | |
733 | * @task: RPC task that is requesting the connect | |
1da177e4 LT |
734 | * |
735 | */ | |
736 | void xprt_connect(struct rpc_task *task) | |
737 | { | |
ad2368d6 | 738 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
1da177e4 | 739 | |
46121cf7 | 740 | dprintk("RPC: %5u xprt_connect xprt %p %s connected\n", task->tk_pid, |
1da177e4 LT |
741 | xprt, (xprt_connected(xprt) ? "is" : "is not")); |
742 | ||
ec739ef0 | 743 | if (!xprt_bound(xprt)) { |
01d37c42 | 744 | task->tk_status = -EAGAIN; |
1da177e4 LT |
745 | return; |
746 | } | |
747 | if (!xprt_lock_write(xprt, task)) | |
748 | return; | |
feb8ca37 TM |
749 | |
750 | if (test_and_clear_bit(XPRT_CLOSE_WAIT, &xprt->state)) | |
751 | xprt->ops->close(xprt); | |
752 | ||
718ba5b8 | 753 | if (!xprt_connected(xprt)) { |
87e3c055 | 754 | task->tk_rqstp->rq_bytes_sent = 0; |
a8ce4a8f | 755 | task->tk_timeout = task->tk_rqstp->rq_timeout; |
5d00837b | 756 | rpc_sleep_on(&xprt->pending, task, xprt_connect_status); |
0b9e7943 TM |
757 | |
758 | if (test_bit(XPRT_CLOSING, &xprt->state)) | |
759 | return; | |
760 | if (xprt_test_and_set_connecting(xprt)) | |
761 | return; | |
262ca07d | 762 | xprt->stat.connect_start = jiffies; |
1b092092 | 763 | xprt->ops->connect(xprt, task); |
1da177e4 | 764 | } |
718ba5b8 | 765 | xprt_release_write(xprt, task); |
1da177e4 LT |
766 | } |
767 | ||
9903cd1c | 768 | static void xprt_connect_status(struct rpc_task *task) |
1da177e4 | 769 | { |
ad2368d6 | 770 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
1da177e4 | 771 | |
cd983ef8 | 772 | if (task->tk_status == 0) { |
262ca07d CL |
773 | xprt->stat.connect_count++; |
774 | xprt->stat.connect_time += (long)jiffies - xprt->stat.connect_start; | |
46121cf7 | 775 | dprintk("RPC: %5u xprt_connect_status: connection established\n", |
1da177e4 LT |
776 | task->tk_pid); |
777 | return; | |
778 | } | |
779 | ||
1da177e4 | 780 | switch (task->tk_status) { |
0fe8d04e TM |
781 | case -ECONNREFUSED: |
782 | case -ECONNRESET: | |
783 | case -ECONNABORTED: | |
784 | case -ENETUNREACH: | |
785 | case -EHOSTUNREACH: | |
2fc193cf | 786 | case -EPIPE: |
2a491991 TM |
787 | case -EAGAIN: |
788 | dprintk("RPC: %5u xprt_connect_status: retrying\n", task->tk_pid); | |
23475d66 | 789 | break; |
1da177e4 | 790 | case -ETIMEDOUT: |
46121cf7 CL |
791 | dprintk("RPC: %5u xprt_connect_status: connect attempt timed " |
792 | "out\n", task->tk_pid); | |
1da177e4 LT |
793 | break; |
794 | default: | |
46121cf7 CL |
795 | dprintk("RPC: %5u xprt_connect_status: error %d connecting to " |
796 | "server %s\n", task->tk_pid, -task->tk_status, | |
4e0038b6 | 797 | xprt->servername); |
23475d66 | 798 | task->tk_status = -EIO; |
1da177e4 | 799 | } |
1da177e4 LT |
800 | } |
801 | ||
9903cd1c CL |
802 | /** |
803 | * xprt_lookup_rqst - find an RPC request corresponding to an XID | |
804 | * @xprt: transport on which the original request was transmitted | |
805 | * @xid: RPC XID of incoming reply | |
806 | * | |
1da177e4 | 807 | */ |
d8ed029d | 808 | struct rpc_rqst *xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid) |
1da177e4 | 809 | { |
8f3a6de3 | 810 | struct rpc_rqst *entry; |
1da177e4 | 811 | |
8f3a6de3 | 812 | list_for_each_entry(entry, &xprt->recv, rq_list) |
3705ad64 JL |
813 | if (entry->rq_xid == xid) { |
814 | trace_xprt_lookup_rqst(xprt, xid, 0); | |
262ca07d | 815 | return entry; |
3705ad64 | 816 | } |
46121cf7 CL |
817 | |
818 | dprintk("RPC: xprt_lookup_rqst did not find xid %08x\n", | |
819 | ntohl(xid)); | |
3705ad64 | 820 | trace_xprt_lookup_rqst(xprt, xid, -ENOENT); |
262ca07d CL |
821 | xprt->stat.bad_xids++; |
822 | return NULL; | |
1da177e4 | 823 | } |
12444809 | 824 | EXPORT_SYMBOL_GPL(xprt_lookup_rqst); |
1da177e4 | 825 | |
bbc72cea | 826 | static void xprt_update_rtt(struct rpc_task *task) |
1570c1e4 CL |
827 | { |
828 | struct rpc_rqst *req = task->tk_rqstp; | |
829 | struct rpc_rtt *rtt = task->tk_client->cl_rtt; | |
95c96174 | 830 | unsigned int timer = task->tk_msg.rpc_proc->p_timer; |
d60dbb20 | 831 | long m = usecs_to_jiffies(ktime_to_us(req->rq_rtt)); |
1570c1e4 CL |
832 | |
833 | if (timer) { | |
834 | if (req->rq_ntrans == 1) | |
ff839970 | 835 | rpc_update_rtt(rtt, timer, m); |
1570c1e4 CL |
836 | rpc_set_timeo(rtt, timer, req->rq_ntrans - 1); |
837 | } | |
838 | } | |
839 | ||
9903cd1c CL |
840 | /** |
841 | * xprt_complete_rqst - called when reply processing is complete | |
1570c1e4 | 842 | * @task: RPC request that recently completed |
9903cd1c CL |
843 | * @copied: actual number of bytes received from the transport |
844 | * | |
1570c1e4 | 845 | * Caller holds transport lock. |
1da177e4 | 846 | */ |
1570c1e4 | 847 | void xprt_complete_rqst(struct rpc_task *task, int copied) |
1da177e4 | 848 | { |
1570c1e4 | 849 | struct rpc_rqst *req = task->tk_rqstp; |
fda13939 | 850 | struct rpc_xprt *xprt = req->rq_xprt; |
1da177e4 | 851 | |
1570c1e4 CL |
852 | dprintk("RPC: %5u xid %08x complete (%d bytes received)\n", |
853 | task->tk_pid, ntohl(req->rq_xid), copied); | |
3705ad64 | 854 | trace_xprt_complete_rqst(xprt, req->rq_xid, copied); |
1da177e4 | 855 | |
fda13939 | 856 | xprt->stat.recvs++; |
d60dbb20 | 857 | req->rq_rtt = ktime_sub(ktime_get(), req->rq_xtime); |
bbc72cea CL |
858 | if (xprt->ops->timer != NULL) |
859 | xprt_update_rtt(task); | |
ef759a2e | 860 | |
1da177e4 | 861 | list_del_init(&req->rq_list); |
1e799b67 | 862 | req->rq_private_buf.len = copied; |
dd2b63d0 RL |
863 | /* Ensure all writes are done before we update */ |
864 | /* req->rq_reply_bytes_recvd */ | |
43ac3f29 | 865 | smp_wmb(); |
dd2b63d0 | 866 | req->rq_reply_bytes_recvd = copied; |
fda13939 | 867 | rpc_wake_up_queued_task(&xprt->pending, task); |
1da177e4 | 868 | } |
12444809 | 869 | EXPORT_SYMBOL_GPL(xprt_complete_rqst); |
1da177e4 | 870 | |
46c0ee8b | 871 | static void xprt_timer(struct rpc_task *task) |
1da177e4 | 872 | { |
46c0ee8b | 873 | struct rpc_rqst *req = task->tk_rqstp; |
1da177e4 LT |
874 | struct rpc_xprt *xprt = req->rq_xprt; |
875 | ||
5d00837b TM |
876 | if (task->tk_status != -ETIMEDOUT) |
877 | return; | |
46121cf7 | 878 | dprintk("RPC: %5u xprt_timer\n", task->tk_pid); |
1da177e4 | 879 | |
5d00837b | 880 | spin_lock_bh(&xprt->transport_lock); |
dd2b63d0 | 881 | if (!req->rq_reply_bytes_recvd) { |
46c0ee8b | 882 | if (xprt->ops->timer) |
6a24dfb6 | 883 | xprt->ops->timer(xprt, task); |
5d00837b TM |
884 | } else |
885 | task->tk_status = 0; | |
886 | spin_unlock_bh(&xprt->transport_lock); | |
1da177e4 LT |
887 | } |
888 | ||
4cfc7e60 RI |
889 | static inline int xprt_has_timer(struct rpc_xprt *xprt) |
890 | { | |
891 | return xprt->idle_timeout != 0; | |
892 | } | |
893 | ||
9903cd1c CL |
894 | /** |
895 | * xprt_prepare_transmit - reserve the transport before sending a request | |
896 | * @task: RPC task about to send a request | |
897 | * | |
1da177e4 | 898 | */ |
90051ea7 | 899 | bool xprt_prepare_transmit(struct rpc_task *task) |
1da177e4 LT |
900 | { |
901 | struct rpc_rqst *req = task->tk_rqstp; | |
902 | struct rpc_xprt *xprt = req->rq_xprt; | |
90051ea7 | 903 | bool ret = false; |
1da177e4 | 904 | |
46121cf7 | 905 | dprintk("RPC: %5u xprt_prepare_transmit\n", task->tk_pid); |
1da177e4 | 906 | |
4a0f8c04 | 907 | spin_lock_bh(&xprt->transport_lock); |
8a19a0b6 TM |
908 | if (!req->rq_bytes_sent) { |
909 | if (req->rq_reply_bytes_recvd) { | |
910 | task->tk_status = req->rq_reply_bytes_recvd; | |
911 | goto out_unlock; | |
912 | } | |
913 | if ((task->tk_flags & RPC_TASK_NO_RETRANS_TIMEOUT) | |
914 | && xprt_connected(xprt) | |
915 | && req->rq_connect_cookie == xprt->connect_cookie) { | |
916 | xprt->ops->set_retrans_timeout(task); | |
917 | rpc_sleep_on(&xprt->pending, task, xprt_timer); | |
918 | goto out_unlock; | |
919 | } | |
1da177e4 | 920 | } |
90051ea7 TM |
921 | if (!xprt->ops->reserve_xprt(xprt, task)) { |
922 | task->tk_status = -EAGAIN; | |
923 | goto out_unlock; | |
924 | } | |
925 | ret = true; | |
1da177e4 | 926 | out_unlock: |
4a0f8c04 | 927 | spin_unlock_bh(&xprt->transport_lock); |
90051ea7 | 928 | return ret; |
1da177e4 LT |
929 | } |
930 | ||
e0ab53de | 931 | void xprt_end_transmit(struct rpc_task *task) |
5e5ce5be | 932 | { |
343952fa | 933 | xprt_release_write(task->tk_rqstp->rq_xprt, task); |
5e5ce5be TM |
934 | } |
935 | ||
9903cd1c CL |
936 | /** |
937 | * xprt_transmit - send an RPC request on a transport | |
938 | * @task: controlling RPC task | |
939 | * | |
940 | * We have to copy the iovec because sendmsg fiddles with its contents. | |
941 | */ | |
942 | void xprt_transmit(struct rpc_task *task) | |
1da177e4 | 943 | { |
1da177e4 LT |
944 | struct rpc_rqst *req = task->tk_rqstp; |
945 | struct rpc_xprt *xprt = req->rq_xprt; | |
15a45206 | 946 | int status, numreqs; |
1da177e4 | 947 | |
46121cf7 | 948 | dprintk("RPC: %5u xprt_transmit(%u)\n", task->tk_pid, req->rq_slen); |
1da177e4 | 949 | |
dd2b63d0 | 950 | if (!req->rq_reply_bytes_recvd) { |
55ae1aab RL |
951 | if (list_empty(&req->rq_list) && rpc_reply_expected(task)) { |
952 | /* | |
953 | * Add to the list only if we're expecting a reply | |
954 | */ | |
4a0f8c04 | 955 | spin_lock_bh(&xprt->transport_lock); |
1da177e4 LT |
956 | /* Update the softirq receive buffer */ |
957 | memcpy(&req->rq_private_buf, &req->rq_rcv_buf, | |
958 | sizeof(req->rq_private_buf)); | |
959 | /* Add request to the receive list */ | |
960 | list_add_tail(&req->rq_list, &xprt->recv); | |
4a0f8c04 | 961 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 | 962 | xprt_reset_majortimeo(req); |
0f9dc2b1 TM |
963 | /* Turn off autodisconnect */ |
964 | del_singleshot_timer_sync(&xprt->timer); | |
1da177e4 LT |
965 | } |
966 | } else if (!req->rq_bytes_sent) | |
967 | return; | |
968 | ||
ff839970 | 969 | req->rq_xtime = ktime_get(); |
a246b010 | 970 | status = xprt->ops->send_request(task); |
3705ad64 | 971 | trace_xprt_transmit(xprt, req->rq_xid, status); |
c8485e4d TM |
972 | if (status != 0) { |
973 | task->tk_status = status; | |
974 | return; | |
975 | } | |
4a068258 | 976 | xprt_inject_disconnect(xprt); |
262ca07d | 977 | |
c8485e4d | 978 | dprintk("RPC: %5u xmit complete\n", task->tk_pid); |
468f8613 | 979 | task->tk_flags |= RPC_TASK_SENT; |
c8485e4d | 980 | spin_lock_bh(&xprt->transport_lock); |
262ca07d | 981 | |
c8485e4d | 982 | xprt->ops->set_retrans_timeout(task); |
262ca07d | 983 | |
15a45206 AA |
984 | numreqs = atomic_read(&xprt->num_reqs); |
985 | if (numreqs > xprt->stat.max_slots) | |
986 | xprt->stat.max_slots = numreqs; | |
c8485e4d TM |
987 | xprt->stat.sends++; |
988 | xprt->stat.req_u += xprt->stat.sends - xprt->stat.recvs; | |
989 | xprt->stat.bklog_u += xprt->backlog.qlen; | |
15a45206 AA |
990 | xprt->stat.sending_u += xprt->sending.qlen; |
991 | xprt->stat.pending_u += xprt->pending.qlen; | |
1da177e4 | 992 | |
c8485e4d TM |
993 | /* Don't race with disconnect */ |
994 | if (!xprt_connected(xprt)) | |
995 | task->tk_status = -ENOTCONN; | |
0a660521 | 996 | else { |
55ae1aab RL |
997 | /* |
998 | * Sleep on the pending queue since | |
999 | * we're expecting a reply. | |
1000 | */ | |
0a660521 TM |
1001 | if (!req->rq_reply_bytes_recvd && rpc_reply_expected(task)) |
1002 | rpc_sleep_on(&xprt->pending, task, xprt_timer); | |
1003 | req->rq_connect_cookie = xprt->connect_cookie; | |
55ae1aab | 1004 | } |
c8485e4d | 1005 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 LT |
1006 | } |
1007 | ||
ba60eb25 TM |
1008 | static void xprt_add_backlog(struct rpc_xprt *xprt, struct rpc_task *task) |
1009 | { | |
1010 | set_bit(XPRT_CONGESTED, &xprt->state); | |
1011 | rpc_sleep_on(&xprt->backlog, task, NULL); | |
1012 | } | |
1013 | ||
1014 | static void xprt_wake_up_backlog(struct rpc_xprt *xprt) | |
1015 | { | |
1016 | if (rpc_wake_up_next(&xprt->backlog) == NULL) | |
1017 | clear_bit(XPRT_CONGESTED, &xprt->state); | |
1018 | } | |
1019 | ||
1020 | static bool xprt_throttle_congested(struct rpc_xprt *xprt, struct rpc_task *task) | |
1021 | { | |
1022 | bool ret = false; | |
1023 | ||
1024 | if (!test_bit(XPRT_CONGESTED, &xprt->state)) | |
1025 | goto out; | |
1026 | spin_lock(&xprt->reserve_lock); | |
1027 | if (test_bit(XPRT_CONGESTED, &xprt->state)) { | |
1028 | rpc_sleep_on(&xprt->backlog, task, NULL); | |
1029 | ret = true; | |
1030 | } | |
1031 | spin_unlock(&xprt->reserve_lock); | |
1032 | out: | |
1033 | return ret; | |
1034 | } | |
1035 | ||
d9ba131d TM |
1036 | static struct rpc_rqst *xprt_dynamic_alloc_slot(struct rpc_xprt *xprt, gfp_t gfp_flags) |
1037 | { | |
1038 | struct rpc_rqst *req = ERR_PTR(-EAGAIN); | |
1039 | ||
1040 | if (!atomic_add_unless(&xprt->num_reqs, 1, xprt->max_reqs)) | |
1041 | goto out; | |
1042 | req = kzalloc(sizeof(struct rpc_rqst), gfp_flags); | |
1043 | if (req != NULL) | |
1044 | goto out; | |
1045 | atomic_dec(&xprt->num_reqs); | |
1046 | req = ERR_PTR(-ENOMEM); | |
1047 | out: | |
1048 | return req; | |
1049 | } | |
1050 | ||
1051 | static bool xprt_dynamic_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *req) | |
1052 | { | |
1053 | if (atomic_add_unless(&xprt->num_reqs, -1, xprt->min_reqs)) { | |
1054 | kfree(req); | |
1055 | return true; | |
1056 | } | |
1057 | return false; | |
1058 | } | |
1059 | ||
f39c1bfb | 1060 | void xprt_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task) |
1da177e4 | 1061 | { |
d9ba131d | 1062 | struct rpc_rqst *req; |
1da177e4 | 1063 | |
f39c1bfb | 1064 | spin_lock(&xprt->reserve_lock); |
1da177e4 | 1065 | if (!list_empty(&xprt->free)) { |
d9ba131d TM |
1066 | req = list_entry(xprt->free.next, struct rpc_rqst, rq_list); |
1067 | list_del(&req->rq_list); | |
1068 | goto out_init_req; | |
1069 | } | |
6b343099 | 1070 | req = xprt_dynamic_alloc_slot(xprt, GFP_NOWAIT|__GFP_NOWARN); |
d9ba131d TM |
1071 | if (!IS_ERR(req)) |
1072 | goto out_init_req; | |
1073 | switch (PTR_ERR(req)) { | |
1074 | case -ENOMEM: | |
d9ba131d TM |
1075 | dprintk("RPC: dynamic allocation of request slot " |
1076 | "failed! Retrying\n"); | |
1afeaf5c | 1077 | task->tk_status = -ENOMEM; |
d9ba131d TM |
1078 | break; |
1079 | case -EAGAIN: | |
ba60eb25 | 1080 | xprt_add_backlog(xprt, task); |
d9ba131d | 1081 | dprintk("RPC: waiting for request slot\n"); |
1afeaf5c TM |
1082 | default: |
1083 | task->tk_status = -EAGAIN; | |
1da177e4 | 1084 | } |
f39c1bfb | 1085 | spin_unlock(&xprt->reserve_lock); |
d9ba131d TM |
1086 | return; |
1087 | out_init_req: | |
1088 | task->tk_status = 0; | |
1089 | task->tk_rqstp = req; | |
1090 | xprt_request_init(task, xprt); | |
f39c1bfb TM |
1091 | spin_unlock(&xprt->reserve_lock); |
1092 | } | |
1093 | EXPORT_SYMBOL_GPL(xprt_alloc_slot); | |
1094 | ||
1095 | void xprt_lock_and_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task) | |
1096 | { | |
1097 | /* Note: grabbing the xprt_lock_write() ensures that we throttle | |
1098 | * new slot allocation if the transport is congested (i.e. when | |
1099 | * reconnecting a stream transport or when out of socket write | |
1100 | * buffer space). | |
1101 | */ | |
1102 | if (xprt_lock_write(xprt, task)) { | |
1103 | xprt_alloc_slot(xprt, task); | |
1104 | xprt_release_write(xprt, task); | |
1105 | } | |
1da177e4 | 1106 | } |
f39c1bfb | 1107 | EXPORT_SYMBOL_GPL(xprt_lock_and_alloc_slot); |
1da177e4 | 1108 | |
ee5ebe85 TM |
1109 | static void xprt_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *req) |
1110 | { | |
ee5ebe85 | 1111 | spin_lock(&xprt->reserve_lock); |
c25573b5 TM |
1112 | if (!xprt_dynamic_free_slot(xprt, req)) { |
1113 | memset(req, 0, sizeof(*req)); /* mark unused */ | |
1114 | list_add(&req->rq_list, &xprt->free); | |
1115 | } | |
ba60eb25 | 1116 | xprt_wake_up_backlog(xprt); |
ee5ebe85 TM |
1117 | spin_unlock(&xprt->reserve_lock); |
1118 | } | |
1119 | ||
21de0a95 TM |
1120 | static void xprt_free_all_slots(struct rpc_xprt *xprt) |
1121 | { | |
1122 | struct rpc_rqst *req; | |
1123 | while (!list_empty(&xprt->free)) { | |
1124 | req = list_first_entry(&xprt->free, struct rpc_rqst, rq_list); | |
1125 | list_del(&req->rq_list); | |
1126 | kfree(req); | |
1127 | } | |
1128 | } | |
1129 | ||
d9ba131d TM |
1130 | struct rpc_xprt *xprt_alloc(struct net *net, size_t size, |
1131 | unsigned int num_prealloc, | |
1132 | unsigned int max_alloc) | |
bd1722d4 PE |
1133 | { |
1134 | struct rpc_xprt *xprt; | |
21de0a95 TM |
1135 | struct rpc_rqst *req; |
1136 | int i; | |
bd1722d4 PE |
1137 | |
1138 | xprt = kzalloc(size, GFP_KERNEL); | |
1139 | if (xprt == NULL) | |
1140 | goto out; | |
1141 | ||
21de0a95 TM |
1142 | xprt_init(xprt, net); |
1143 | ||
1144 | for (i = 0; i < num_prealloc; i++) { | |
1145 | req = kzalloc(sizeof(struct rpc_rqst), GFP_KERNEL); | |
1146 | if (!req) | |
8313164c | 1147 | goto out_free; |
21de0a95 TM |
1148 | list_add(&req->rq_list, &xprt->free); |
1149 | } | |
d9ba131d TM |
1150 | if (max_alloc > num_prealloc) |
1151 | xprt->max_reqs = max_alloc; | |
1152 | else | |
1153 | xprt->max_reqs = num_prealloc; | |
1154 | xprt->min_reqs = num_prealloc; | |
1155 | atomic_set(&xprt->num_reqs, num_prealloc); | |
bd1722d4 PE |
1156 | |
1157 | return xprt; | |
1158 | ||
1159 | out_free: | |
21de0a95 | 1160 | xprt_free(xprt); |
bd1722d4 PE |
1161 | out: |
1162 | return NULL; | |
1163 | } | |
1164 | EXPORT_SYMBOL_GPL(xprt_alloc); | |
1165 | ||
e204e621 PE |
1166 | void xprt_free(struct rpc_xprt *xprt) |
1167 | { | |
37aa2133 | 1168 | put_net(xprt->xprt_net); |
21de0a95 | 1169 | xprt_free_all_slots(xprt); |
fda1bfef | 1170 | kfree_rcu(xprt, rcu); |
e204e621 PE |
1171 | } |
1172 | EXPORT_SYMBOL_GPL(xprt_free); | |
1173 | ||
9903cd1c CL |
1174 | /** |
1175 | * xprt_reserve - allocate an RPC request slot | |
1176 | * @task: RPC task requesting a slot allocation | |
1177 | * | |
ba60eb25 TM |
1178 | * If the transport is marked as being congested, or if no more |
1179 | * slots are available, place the task on the transport's | |
9903cd1c CL |
1180 | * backlog queue. |
1181 | */ | |
1182 | void xprt_reserve(struct rpc_task *task) | |
1da177e4 | 1183 | { |
fb43d172 | 1184 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 | 1185 | |
43cedbf0 TM |
1186 | task->tk_status = 0; |
1187 | if (task->tk_rqstp != NULL) | |
1188 | return; | |
1189 | ||
43cedbf0 TM |
1190 | task->tk_timeout = 0; |
1191 | task->tk_status = -EAGAIN; | |
ba60eb25 TM |
1192 | if (!xprt_throttle_congested(xprt, task)) |
1193 | xprt->ops->alloc_slot(xprt, task); | |
ba60eb25 TM |
1194 | } |
1195 | ||
1196 | /** | |
1197 | * xprt_retry_reserve - allocate an RPC request slot | |
1198 | * @task: RPC task requesting a slot allocation | |
1199 | * | |
1200 | * If no more slots are available, place the task on the transport's | |
1201 | * backlog queue. | |
1202 | * Note that the only difference with xprt_reserve is that we now | |
1203 | * ignore the value of the XPRT_CONGESTED flag. | |
1204 | */ | |
1205 | void xprt_retry_reserve(struct rpc_task *task) | |
1206 | { | |
fb43d172 | 1207 | struct rpc_xprt *xprt = task->tk_xprt; |
ba60eb25 TM |
1208 | |
1209 | task->tk_status = 0; | |
1210 | if (task->tk_rqstp != NULL) | |
1211 | return; | |
1212 | ||
1213 | task->tk_timeout = 0; | |
1214 | task->tk_status = -EAGAIN; | |
f39c1bfb | 1215 | xprt->ops->alloc_slot(xprt, task); |
1da177e4 LT |
1216 | } |
1217 | ||
d8ed029d | 1218 | static inline __be32 xprt_alloc_xid(struct rpc_xprt *xprt) |
1da177e4 | 1219 | { |
0eae88f3 | 1220 | return (__force __be32)xprt->xid++; |
1da177e4 LT |
1221 | } |
1222 | ||
1223 | static inline void xprt_init_xid(struct rpc_xprt *xprt) | |
1224 | { | |
63862b5b | 1225 | xprt->xid = prandom_u32(); |
1da177e4 LT |
1226 | } |
1227 | ||
9903cd1c | 1228 | static void xprt_request_init(struct rpc_task *task, struct rpc_xprt *xprt) |
1da177e4 LT |
1229 | { |
1230 | struct rpc_rqst *req = task->tk_rqstp; | |
1231 | ||
d9ba131d | 1232 | INIT_LIST_HEAD(&req->rq_list); |
ba7392bb | 1233 | req->rq_timeout = task->tk_client->cl_timeout->to_initval; |
1da177e4 LT |
1234 | req->rq_task = task; |
1235 | req->rq_xprt = xprt; | |
02107148 | 1236 | req->rq_buffer = NULL; |
1da177e4 | 1237 | req->rq_xid = xprt_alloc_xid(xprt); |
0a660521 | 1238 | req->rq_connect_cookie = xprt->connect_cookie - 1; |
92551948 TM |
1239 | req->rq_bytes_sent = 0; |
1240 | req->rq_snd_buf.len = 0; | |
1241 | req->rq_snd_buf.buflen = 0; | |
1242 | req->rq_rcv_buf.len = 0; | |
1243 | req->rq_rcv_buf.buflen = 0; | |
ead5e1c2 | 1244 | req->rq_release_snd_buf = NULL; |
da45828e | 1245 | xprt_reset_majortimeo(req); |
46121cf7 | 1246 | dprintk("RPC: %5u reserved req %p xid %08x\n", task->tk_pid, |
1da177e4 LT |
1247 | req, ntohl(req->rq_xid)); |
1248 | } | |
1249 | ||
9903cd1c CL |
1250 | /** |
1251 | * xprt_release - release an RPC request slot | |
1252 | * @task: task which is finished with the slot | |
1253 | * | |
1da177e4 | 1254 | */ |
9903cd1c | 1255 | void xprt_release(struct rpc_task *task) |
1da177e4 | 1256 | { |
55ae1aab | 1257 | struct rpc_xprt *xprt; |
87ed5003 | 1258 | struct rpc_rqst *req = task->tk_rqstp; |
1da177e4 | 1259 | |
87ed5003 TM |
1260 | if (req == NULL) { |
1261 | if (task->tk_client) { | |
fb43d172 | 1262 | xprt = task->tk_xprt; |
87ed5003 TM |
1263 | if (xprt->snd_task == task) |
1264 | xprt_release_write(xprt, task); | |
87ed5003 | 1265 | } |
1da177e4 | 1266 | return; |
87ed5003 | 1267 | } |
55ae1aab | 1268 | |
55ae1aab | 1269 | xprt = req->rq_xprt; |
0a702195 WAA |
1270 | if (task->tk_ops->rpc_count_stats != NULL) |
1271 | task->tk_ops->rpc_count_stats(task, task->tk_calldata); | |
1272 | else if (task->tk_client) | |
1273 | rpc_count_iostats(task, task->tk_client->cl_metrics); | |
4a0f8c04 | 1274 | spin_lock_bh(&xprt->transport_lock); |
49e9a890 | 1275 | xprt->ops->release_xprt(xprt, task); |
a58dd398 CL |
1276 | if (xprt->ops->release_request) |
1277 | xprt->ops->release_request(task); | |
1da177e4 LT |
1278 | if (!list_empty(&req->rq_list)) |
1279 | list_del(&req->rq_list); | |
1280 | xprt->last_used = jiffies; | |
4cfc7e60 | 1281 | if (list_empty(&xprt->recv) && xprt_has_timer(xprt)) |
a246b010 | 1282 | mod_timer(&xprt->timer, |
03bf4b70 | 1283 | xprt->last_used + xprt->idle_timeout); |
4a0f8c04 | 1284 | spin_unlock_bh(&xprt->transport_lock); |
ee5ebe85 | 1285 | if (req->rq_buffer) |
55ae1aab | 1286 | xprt->ops->buf_free(req->rq_buffer); |
4a068258 | 1287 | xprt_inject_disconnect(xprt); |
a17c2153 TM |
1288 | if (req->rq_cred != NULL) |
1289 | put_rpccred(req->rq_cred); | |
1da177e4 | 1290 | task->tk_rqstp = NULL; |
ead5e1c2 BF |
1291 | if (req->rq_release_snd_buf) |
1292 | req->rq_release_snd_buf(req); | |
55ae1aab | 1293 | |
46121cf7 | 1294 | dprintk("RPC: %5u release request %p\n", task->tk_pid, req); |
ee5ebe85 TM |
1295 | if (likely(!bc_prealloc(req))) |
1296 | xprt_free_slot(xprt, req); | |
1297 | else | |
c9acb42e | 1298 | xprt_free_bc_request(req); |
1da177e4 LT |
1299 | } |
1300 | ||
21de0a95 | 1301 | static void xprt_init(struct rpc_xprt *xprt, struct net *net) |
c2866763 | 1302 | { |
30c5116b | 1303 | kref_init(&xprt->kref); |
c2866763 CL |
1304 | |
1305 | spin_lock_init(&xprt->transport_lock); | |
1306 | spin_lock_init(&xprt->reserve_lock); | |
1307 | ||
1308 | INIT_LIST_HEAD(&xprt->free); | |
1309 | INIT_LIST_HEAD(&xprt->recv); | |
9e00abc3 | 1310 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
f9acac1a RL |
1311 | spin_lock_init(&xprt->bc_pa_lock); |
1312 | INIT_LIST_HEAD(&xprt->bc_pa_list); | |
9e00abc3 | 1313 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
80b14d5e | 1314 | INIT_LIST_HEAD(&xprt->xprt_switch); |
f9acac1a | 1315 | |
c2866763 CL |
1316 | xprt->last_used = jiffies; |
1317 | xprt->cwnd = RPC_INITCWND; | |
a509050b | 1318 | xprt->bind_index = 0; |
c2866763 CL |
1319 | |
1320 | rpc_init_wait_queue(&xprt->binding, "xprt_binding"); | |
1321 | rpc_init_wait_queue(&xprt->pending, "xprt_pending"); | |
34006cee | 1322 | rpc_init_priority_wait_queue(&xprt->sending, "xprt_sending"); |
c2866763 CL |
1323 | rpc_init_priority_wait_queue(&xprt->backlog, "xprt_backlog"); |
1324 | ||
c2866763 CL |
1325 | xprt_init_xid(xprt); |
1326 | ||
21de0a95 | 1327 | xprt->xprt_net = get_net(net); |
8d9266ff TM |
1328 | } |
1329 | ||
1330 | /** | |
1331 | * xprt_create_transport - create an RPC transport | |
1332 | * @args: rpc transport creation arguments | |
1333 | * | |
1334 | */ | |
1335 | struct rpc_xprt *xprt_create_transport(struct xprt_create *args) | |
1336 | { | |
1337 | struct rpc_xprt *xprt; | |
1338 | struct xprt_class *t; | |
1339 | ||
1340 | spin_lock(&xprt_list_lock); | |
1341 | list_for_each_entry(t, &xprt_list, list) { | |
1342 | if (t->ident == args->ident) { | |
1343 | spin_unlock(&xprt_list_lock); | |
1344 | goto found; | |
1345 | } | |
1346 | } | |
1347 | spin_unlock(&xprt_list_lock); | |
3c45ddf8 | 1348 | dprintk("RPC: transport (%d) not supported\n", args->ident); |
8d9266ff TM |
1349 | return ERR_PTR(-EIO); |
1350 | ||
1351 | found: | |
1352 | xprt = t->setup(args); | |
1353 | if (IS_ERR(xprt)) { | |
1354 | dprintk("RPC: xprt_create_transport: failed, %ld\n", | |
1355 | -PTR_ERR(xprt)); | |
21de0a95 | 1356 | goto out; |
8d9266ff | 1357 | } |
33d90ac0 BF |
1358 | if (args->flags & XPRT_CREATE_NO_IDLE_TIMEOUT) |
1359 | xprt->idle_timeout = 0; | |
21de0a95 TM |
1360 | INIT_WORK(&xprt->task_cleanup, xprt_autoclose); |
1361 | if (xprt_has_timer(xprt)) | |
1362 | setup_timer(&xprt->timer, xprt_init_autodisconnect, | |
1363 | (unsigned long)xprt); | |
1364 | else | |
1365 | init_timer(&xprt->timer); | |
4e0038b6 TM |
1366 | |
1367 | if (strlen(args->servername) > RPC_MAXNETNAMELEN) { | |
1368 | xprt_destroy(xprt); | |
1369 | return ERR_PTR(-EINVAL); | |
1370 | } | |
1371 | xprt->servername = kstrdup(args->servername, GFP_KERNEL); | |
1372 | if (xprt->servername == NULL) { | |
1373 | xprt_destroy(xprt); | |
1374 | return ERR_PTR(-ENOMEM); | |
1375 | } | |
1376 | ||
3f940098 | 1377 | rpc_xprt_debugfs_register(xprt); |
388f0c77 | 1378 | |
46121cf7 | 1379 | dprintk("RPC: created transport %p with %u slots\n", xprt, |
c2866763 | 1380 | xprt->max_reqs); |
21de0a95 | 1381 | out: |
c2866763 CL |
1382 | return xprt; |
1383 | } | |
1384 | ||
9903cd1c CL |
1385 | /** |
1386 | * xprt_destroy - destroy an RPC transport, killing off all requests. | |
a8de240a | 1387 | * @xprt: transport to destroy |
9903cd1c | 1388 | * |
1da177e4 | 1389 | */ |
a8de240a | 1390 | static void xprt_destroy(struct rpc_xprt *xprt) |
1da177e4 | 1391 | { |
46121cf7 | 1392 | dprintk("RPC: destroying transport %p\n", xprt); |
79234c3d TM |
1393 | |
1394 | /* Exclude transport connect/disconnect handlers */ | |
1395 | wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_UNINTERRUPTIBLE); | |
1396 | ||
0065db32 | 1397 | del_timer_sync(&xprt->timer); |
c8541ecd | 1398 | |
388f0c77 | 1399 | rpc_xprt_debugfs_unregister(xprt); |
f6a1cc89 TM |
1400 | rpc_destroy_wait_queue(&xprt->binding); |
1401 | rpc_destroy_wait_queue(&xprt->pending); | |
1402 | rpc_destroy_wait_queue(&xprt->sending); | |
f6a1cc89 | 1403 | rpc_destroy_wait_queue(&xprt->backlog); |
c3ae62ae | 1404 | cancel_work_sync(&xprt->task_cleanup); |
4e0038b6 | 1405 | kfree(xprt->servername); |
c8541ecd CL |
1406 | /* |
1407 | * Tear down transport state and free the rpc_xprt | |
1408 | */ | |
a246b010 | 1409 | xprt->ops->destroy(xprt); |
6b6ca86b | 1410 | } |
1da177e4 | 1411 | |
30c5116b TM |
1412 | static void xprt_destroy_kref(struct kref *kref) |
1413 | { | |
1414 | xprt_destroy(container_of(kref, struct rpc_xprt, kref)); | |
1415 | } | |
1416 | ||
1417 | /** | |
1418 | * xprt_get - return a reference to an RPC transport. | |
1419 | * @xprt: pointer to the transport | |
1420 | * | |
1421 | */ | |
1422 | struct rpc_xprt *xprt_get(struct rpc_xprt *xprt) | |
1423 | { | |
1424 | if (xprt != NULL && kref_get_unless_zero(&xprt->kref)) | |
1425 | return xprt; | |
1426 | return NULL; | |
1427 | } | |
1428 | EXPORT_SYMBOL_GPL(xprt_get); | |
1429 | ||
6b6ca86b TM |
1430 | /** |
1431 | * xprt_put - release a reference to an RPC transport. | |
1432 | * @xprt: pointer to the transport | |
1433 | * | |
1434 | */ | |
1435 | void xprt_put(struct rpc_xprt *xprt) | |
1436 | { | |
30c5116b TM |
1437 | if (xprt != NULL) |
1438 | kref_put(&xprt->kref, xprt_destroy_kref); | |
6b6ca86b | 1439 | } |
5d252f90 | 1440 | EXPORT_SYMBOL_GPL(xprt_put); |