Commit | Line | Data |
---|---|---|
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> |
1da177e4 | 51 | |
3705ad64 JL |
52 | #include <trace/events/sunrpc.h> |
53 | ||
55ae1aab RL |
54 | #include "sunrpc.h" |
55 | ||
1da177e4 LT |
56 | /* |
57 | * Local variables | |
58 | */ | |
59 | ||
f895b252 | 60 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
1da177e4 LT |
61 | # define RPCDBG_FACILITY RPCDBG_XPRT |
62 | #endif | |
63 | ||
1da177e4 LT |
64 | /* |
65 | * Local functions | |
66 | */ | |
21de0a95 | 67 | static void xprt_init(struct rpc_xprt *xprt, struct net *net); |
1da177e4 | 68 | static void xprt_request_init(struct rpc_task *, struct rpc_xprt *); |
1da177e4 | 69 | static void xprt_connect_status(struct rpc_task *task); |
1da177e4 | 70 | static int __xprt_get_cong(struct rpc_xprt *, struct rpc_task *); |
4e0038b6 | 71 | static void xprt_destroy(struct rpc_xprt *xprt); |
1da177e4 | 72 | |
5ba03e82 | 73 | static DEFINE_SPINLOCK(xprt_list_lock); |
81c098af TT |
74 | static LIST_HEAD(xprt_list); |
75 | ||
81c098af TT |
76 | /** |
77 | * xprt_register_transport - register a transport implementation | |
78 | * @transport: transport to register | |
79 | * | |
80 | * If a transport implementation is loaded as a kernel module, it can | |
81 | * call this interface to make itself known to the RPC client. | |
82 | * | |
83 | * Returns: | |
84 | * 0: transport successfully registered | |
85 | * -EEXIST: transport already registered | |
86 | * -EINVAL: transport module being unloaded | |
87 | */ | |
88 | int xprt_register_transport(struct xprt_class *transport) | |
89 | { | |
90 | struct xprt_class *t; | |
91 | int result; | |
92 | ||
93 | result = -EEXIST; | |
94 | spin_lock(&xprt_list_lock); | |
95 | list_for_each_entry(t, &xprt_list, list) { | |
96 | /* don't register the same transport class twice */ | |
4fa016eb | 97 | if (t->ident == transport->ident) |
81c098af TT |
98 | goto out; |
99 | } | |
100 | ||
c9f6cde6 DL |
101 | list_add_tail(&transport->list, &xprt_list); |
102 | printk(KERN_INFO "RPC: Registered %s transport module.\n", | |
103 | transport->name); | |
104 | result = 0; | |
81c098af TT |
105 | |
106 | out: | |
107 | spin_unlock(&xprt_list_lock); | |
108 | return result; | |
109 | } | |
110 | EXPORT_SYMBOL_GPL(xprt_register_transport); | |
111 | ||
112 | /** | |
113 | * xprt_unregister_transport - unregister a transport implementation | |
65b6e42c | 114 | * @transport: transport to unregister |
81c098af TT |
115 | * |
116 | * Returns: | |
117 | * 0: transport successfully unregistered | |
118 | * -ENOENT: transport never registered | |
119 | */ | |
120 | int xprt_unregister_transport(struct xprt_class *transport) | |
121 | { | |
122 | struct xprt_class *t; | |
123 | int result; | |
124 | ||
125 | result = 0; | |
126 | spin_lock(&xprt_list_lock); | |
127 | list_for_each_entry(t, &xprt_list, list) { | |
128 | if (t == transport) { | |
129 | printk(KERN_INFO | |
130 | "RPC: Unregistered %s transport module.\n", | |
131 | transport->name); | |
132 | list_del_init(&transport->list); | |
81c098af TT |
133 | goto out; |
134 | } | |
135 | } | |
136 | result = -ENOENT; | |
137 | ||
138 | out: | |
139 | spin_unlock(&xprt_list_lock); | |
140 | return result; | |
141 | } | |
142 | EXPORT_SYMBOL_GPL(xprt_unregister_transport); | |
143 | ||
441e3e24 TT |
144 | /** |
145 | * xprt_load_transport - load a transport implementation | |
146 | * @transport_name: transport to load | |
147 | * | |
148 | * Returns: | |
149 | * 0: transport successfully loaded | |
150 | * -ENOENT: transport module not available | |
151 | */ | |
152 | int xprt_load_transport(const char *transport_name) | |
153 | { | |
154 | struct xprt_class *t; | |
441e3e24 TT |
155 | int result; |
156 | ||
157 | result = 0; | |
158 | spin_lock(&xprt_list_lock); | |
159 | list_for_each_entry(t, &xprt_list, list) { | |
160 | if (strcmp(t->name, transport_name) == 0) { | |
161 | spin_unlock(&xprt_list_lock); | |
162 | goto out; | |
163 | } | |
164 | } | |
165 | spin_unlock(&xprt_list_lock); | |
ef7ffe8f | 166 | result = request_module("xprt%s", transport_name); |
441e3e24 TT |
167 | out: |
168 | return result; | |
169 | } | |
170 | EXPORT_SYMBOL_GPL(xprt_load_transport); | |
171 | ||
12a80469 CL |
172 | /** |
173 | * xprt_reserve_xprt - serialize write access to transports | |
174 | * @task: task that is requesting access to the transport | |
177c27bf | 175 | * @xprt: pointer to the target transport |
12a80469 CL |
176 | * |
177 | * This prevents mixing the payload of separate requests, and prevents | |
178 | * transport connects from colliding with writes. No congestion control | |
179 | * is provided. | |
180 | */ | |
43cedbf0 | 181 | int xprt_reserve_xprt(struct rpc_xprt *xprt, struct rpc_task *task) |
12a80469 | 182 | { |
12a80469 | 183 | struct rpc_rqst *req = task->tk_rqstp; |
34006cee | 184 | int priority; |
12a80469 CL |
185 | |
186 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { | |
187 | if (task == xprt->snd_task) | |
188 | return 1; | |
12a80469 CL |
189 | goto out_sleep; |
190 | } | |
191 | xprt->snd_task = task; | |
92551948 | 192 | if (req != NULL) |
43cedbf0 | 193 | req->rq_ntrans++; |
4d4a76f3 | 194 | |
12a80469 CL |
195 | return 1; |
196 | ||
197 | out_sleep: | |
46121cf7 | 198 | dprintk("RPC: %5u failed to lock transport %p\n", |
12a80469 CL |
199 | task->tk_pid, xprt); |
200 | task->tk_timeout = 0; | |
201 | task->tk_status = -EAGAIN; | |
34006cee TM |
202 | if (req == NULL) |
203 | priority = RPC_PRIORITY_LOW; | |
204 | else if (!req->rq_ntrans) | |
205 | priority = RPC_PRIORITY_NORMAL; | |
12a80469 | 206 | else |
34006cee TM |
207 | priority = RPC_PRIORITY_HIGH; |
208 | rpc_sleep_on_priority(&xprt->sending, task, NULL, priority); | |
12a80469 CL |
209 | return 0; |
210 | } | |
12444809 | 211 | EXPORT_SYMBOL_GPL(xprt_reserve_xprt); |
12a80469 | 212 | |
632e3bdc TM |
213 | static void xprt_clear_locked(struct rpc_xprt *xprt) |
214 | { | |
215 | xprt->snd_task = NULL; | |
d19751e7 | 216 | if (!test_bit(XPRT_CLOSE_WAIT, &xprt->state)) { |
4e857c58 | 217 | smp_mb__before_atomic(); |
632e3bdc | 218 | clear_bit(XPRT_LOCKED, &xprt->state); |
4e857c58 | 219 | smp_mb__after_atomic(); |
632e3bdc | 220 | } else |
c1384c9c | 221 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
632e3bdc TM |
222 | } |
223 | ||
1da177e4 | 224 | /* |
12a80469 CL |
225 | * xprt_reserve_xprt_cong - serialize write access to transports |
226 | * @task: task that is requesting access to the transport | |
227 | * | |
228 | * Same as xprt_reserve_xprt, but Van Jacobson congestion control is | |
229 | * integrated into the decision of whether a request is allowed to be | |
230 | * woken up and given access to the transport. | |
1da177e4 | 231 | */ |
43cedbf0 | 232 | int xprt_reserve_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task) |
1da177e4 LT |
233 | { |
234 | struct rpc_rqst *req = task->tk_rqstp; | |
34006cee | 235 | int priority; |
1da177e4 | 236 | |
2226feb6 | 237 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { |
1da177e4 LT |
238 | if (task == xprt->snd_task) |
239 | return 1; | |
1da177e4 LT |
240 | goto out_sleep; |
241 | } | |
43cedbf0 TM |
242 | if (req == NULL) { |
243 | xprt->snd_task = task; | |
244 | return 1; | |
245 | } | |
12a80469 | 246 | if (__xprt_get_cong(xprt, task)) { |
1da177e4 | 247 | xprt->snd_task = task; |
43cedbf0 | 248 | req->rq_ntrans++; |
1da177e4 LT |
249 | return 1; |
250 | } | |
632e3bdc | 251 | xprt_clear_locked(xprt); |
1da177e4 | 252 | out_sleep: |
46121cf7 | 253 | dprintk("RPC: %5u failed to lock transport %p\n", task->tk_pid, xprt); |
1da177e4 LT |
254 | task->tk_timeout = 0; |
255 | task->tk_status = -EAGAIN; | |
34006cee TM |
256 | if (req == NULL) |
257 | priority = RPC_PRIORITY_LOW; | |
258 | else if (!req->rq_ntrans) | |
259 | priority = RPC_PRIORITY_NORMAL; | |
1da177e4 | 260 | else |
34006cee TM |
261 | priority = RPC_PRIORITY_HIGH; |
262 | rpc_sleep_on_priority(&xprt->sending, task, NULL, priority); | |
1da177e4 LT |
263 | return 0; |
264 | } | |
12444809 | 265 | EXPORT_SYMBOL_GPL(xprt_reserve_xprt_cong); |
1da177e4 | 266 | |
12a80469 | 267 | static inline int xprt_lock_write(struct rpc_xprt *xprt, struct rpc_task *task) |
1da177e4 LT |
268 | { |
269 | int retval; | |
270 | ||
4a0f8c04 | 271 | spin_lock_bh(&xprt->transport_lock); |
43cedbf0 | 272 | retval = xprt->ops->reserve_xprt(xprt, task); |
4a0f8c04 | 273 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 LT |
274 | return retval; |
275 | } | |
276 | ||
961a828d | 277 | static bool __xprt_lock_write_func(struct rpc_task *task, void *data) |
49e9a890 | 278 | { |
961a828d | 279 | struct rpc_xprt *xprt = data; |
49e9a890 CL |
280 | struct rpc_rqst *req; |
281 | ||
49e9a890 CL |
282 | req = task->tk_rqstp; |
283 | xprt->snd_task = task; | |
92551948 | 284 | if (req) |
49e9a890 | 285 | req->rq_ntrans++; |
961a828d TM |
286 | return true; |
287 | } | |
49e9a890 | 288 | |
961a828d TM |
289 | static void __xprt_lock_write_next(struct rpc_xprt *xprt) |
290 | { | |
291 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) | |
292 | return; | |
293 | ||
294 | if (rpc_wake_up_first(&xprt->sending, __xprt_lock_write_func, xprt)) | |
295 | return; | |
632e3bdc | 296 | xprt_clear_locked(xprt); |
49e9a890 CL |
297 | } |
298 | ||
961a828d | 299 | static bool __xprt_lock_write_cong_func(struct rpc_task *task, void *data) |
1da177e4 | 300 | { |
961a828d | 301 | struct rpc_xprt *xprt = data; |
43cedbf0 | 302 | struct rpc_rqst *req; |
1da177e4 | 303 | |
43cedbf0 TM |
304 | req = task->tk_rqstp; |
305 | if (req == NULL) { | |
306 | xprt->snd_task = task; | |
961a828d | 307 | return true; |
43cedbf0 | 308 | } |
49e9a890 | 309 | if (__xprt_get_cong(xprt, task)) { |
1da177e4 | 310 | xprt->snd_task = task; |
43cedbf0 | 311 | req->rq_ntrans++; |
961a828d | 312 | return true; |
1da177e4 | 313 | } |
961a828d TM |
314 | return false; |
315 | } | |
316 | ||
317 | static void __xprt_lock_write_next_cong(struct rpc_xprt *xprt) | |
318 | { | |
319 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) | |
320 | return; | |
321 | if (RPCXPRT_CONGESTED(xprt)) | |
322 | goto out_unlock; | |
323 | if (rpc_wake_up_first(&xprt->sending, __xprt_lock_write_cong_func, xprt)) | |
324 | return; | |
1da177e4 | 325 | out_unlock: |
632e3bdc | 326 | xprt_clear_locked(xprt); |
1da177e4 LT |
327 | } |
328 | ||
0695314e TM |
329 | static void xprt_task_clear_bytes_sent(struct rpc_task *task) |
330 | { | |
331 | if (task != NULL) { | |
332 | struct rpc_rqst *req = task->tk_rqstp; | |
333 | if (req != NULL) | |
334 | req->rq_bytes_sent = 0; | |
335 | } | |
336 | } | |
337 | ||
49e9a890 CL |
338 | /** |
339 | * xprt_release_xprt - allow other requests to use a transport | |
340 | * @xprt: transport with other tasks potentially waiting | |
341 | * @task: task that is releasing access to the transport | |
342 | * | |
343 | * Note that "task" can be NULL. No congestion control is provided. | |
1da177e4 | 344 | */ |
49e9a890 | 345 | void xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) |
1da177e4 LT |
346 | { |
347 | if (xprt->snd_task == task) { | |
0695314e | 348 | xprt_task_clear_bytes_sent(task); |
632e3bdc | 349 | xprt_clear_locked(xprt); |
1da177e4 LT |
350 | __xprt_lock_write_next(xprt); |
351 | } | |
352 | } | |
12444809 | 353 | EXPORT_SYMBOL_GPL(xprt_release_xprt); |
1da177e4 | 354 | |
49e9a890 CL |
355 | /** |
356 | * xprt_release_xprt_cong - allow other requests to use a transport | |
357 | * @xprt: transport with other tasks potentially waiting | |
358 | * @task: task that is releasing access to the transport | |
359 | * | |
360 | * Note that "task" can be NULL. Another task is awoken to use the | |
361 | * transport if the transport's congestion window allows it. | |
362 | */ | |
363 | void xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task) | |
364 | { | |
365 | if (xprt->snd_task == task) { | |
0695314e | 366 | xprt_task_clear_bytes_sent(task); |
632e3bdc | 367 | xprt_clear_locked(xprt); |
49e9a890 CL |
368 | __xprt_lock_write_next_cong(xprt); |
369 | } | |
370 | } | |
12444809 | 371 | EXPORT_SYMBOL_GPL(xprt_release_xprt_cong); |
49e9a890 CL |
372 | |
373 | static inline void xprt_release_write(struct rpc_xprt *xprt, struct rpc_task *task) | |
1da177e4 | 374 | { |
4a0f8c04 | 375 | spin_lock_bh(&xprt->transport_lock); |
49e9a890 | 376 | xprt->ops->release_xprt(xprt, task); |
4a0f8c04 | 377 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 LT |
378 | } |
379 | ||
1da177e4 LT |
380 | /* |
381 | * Van Jacobson congestion avoidance. Check if the congestion window | |
382 | * overflowed. Put the task to sleep if this is the case. | |
383 | */ | |
384 | static int | |
385 | __xprt_get_cong(struct rpc_xprt *xprt, struct rpc_task *task) | |
386 | { | |
387 | struct rpc_rqst *req = task->tk_rqstp; | |
388 | ||
389 | if (req->rq_cong) | |
390 | return 1; | |
46121cf7 | 391 | dprintk("RPC: %5u xprt_cwnd_limited cong = %lu cwnd = %lu\n", |
1da177e4 LT |
392 | task->tk_pid, xprt->cong, xprt->cwnd); |
393 | if (RPCXPRT_CONGESTED(xprt)) | |
394 | return 0; | |
395 | req->rq_cong = 1; | |
396 | xprt->cong += RPC_CWNDSCALE; | |
397 | return 1; | |
398 | } | |
399 | ||
400 | /* | |
401 | * Adjust the congestion window, and wake up the next task | |
402 | * that has been sleeping due to congestion | |
403 | */ | |
404 | static void | |
405 | __xprt_put_cong(struct rpc_xprt *xprt, struct rpc_rqst *req) | |
406 | { | |
407 | if (!req->rq_cong) | |
408 | return; | |
409 | req->rq_cong = 0; | |
410 | xprt->cong -= RPC_CWNDSCALE; | |
49e9a890 | 411 | __xprt_lock_write_next_cong(xprt); |
1da177e4 LT |
412 | } |
413 | ||
a58dd398 CL |
414 | /** |
415 | * xprt_release_rqst_cong - housekeeping when request is complete | |
416 | * @task: RPC request that recently completed | |
417 | * | |
418 | * Useful for transports that require congestion control. | |
419 | */ | |
420 | void xprt_release_rqst_cong(struct rpc_task *task) | |
421 | { | |
a4f0835c TM |
422 | struct rpc_rqst *req = task->tk_rqstp; |
423 | ||
424 | __xprt_put_cong(req->rq_xprt, req); | |
a58dd398 | 425 | } |
12444809 | 426 | EXPORT_SYMBOL_GPL(xprt_release_rqst_cong); |
a58dd398 | 427 | |
46c0ee8b CL |
428 | /** |
429 | * xprt_adjust_cwnd - adjust transport congestion window | |
6a24dfb6 | 430 | * @xprt: pointer to xprt |
46c0ee8b CL |
431 | * @task: recently completed RPC request used to adjust window |
432 | * @result: result code of completed RPC request | |
433 | * | |
4f4cf5ad CL |
434 | * The transport code maintains an estimate on the maximum number of out- |
435 | * standing RPC requests, using a smoothed version of the congestion | |
436 | * avoidance implemented in 44BSD. This is basically the Van Jacobson | |
437 | * congestion algorithm: If a retransmit occurs, the congestion window is | |
438 | * halved; otherwise, it is incremented by 1/cwnd when | |
439 | * | |
440 | * - a reply is received and | |
441 | * - a full number of requests are outstanding and | |
442 | * - the congestion window hasn't been updated recently. | |
1da177e4 | 443 | */ |
6a24dfb6 | 444 | void xprt_adjust_cwnd(struct rpc_xprt *xprt, struct rpc_task *task, int result) |
1da177e4 | 445 | { |
46c0ee8b | 446 | struct rpc_rqst *req = task->tk_rqstp; |
46c0ee8b | 447 | unsigned long cwnd = xprt->cwnd; |
1da177e4 | 448 | |
1da177e4 LT |
449 | if (result >= 0 && cwnd <= xprt->cong) { |
450 | /* The (cwnd >> 1) term makes sure | |
451 | * the result gets rounded properly. */ | |
452 | cwnd += (RPC_CWNDSCALE * RPC_CWNDSCALE + (cwnd >> 1)) / cwnd; | |
453 | if (cwnd > RPC_MAXCWND(xprt)) | |
454 | cwnd = RPC_MAXCWND(xprt); | |
49e9a890 | 455 | __xprt_lock_write_next_cong(xprt); |
1da177e4 LT |
456 | } else if (result == -ETIMEDOUT) { |
457 | cwnd >>= 1; | |
458 | if (cwnd < RPC_CWNDSCALE) | |
459 | cwnd = RPC_CWNDSCALE; | |
460 | } | |
46121cf7 | 461 | dprintk("RPC: cong %ld, cwnd was %ld, now %ld\n", |
1da177e4 LT |
462 | xprt->cong, xprt->cwnd, cwnd); |
463 | xprt->cwnd = cwnd; | |
46c0ee8b | 464 | __xprt_put_cong(xprt, req); |
1da177e4 | 465 | } |
12444809 | 466 | EXPORT_SYMBOL_GPL(xprt_adjust_cwnd); |
1da177e4 | 467 | |
44fbac22 CL |
468 | /** |
469 | * xprt_wake_pending_tasks - wake all tasks on a transport's pending queue | |
470 | * @xprt: transport with waiting tasks | |
471 | * @status: result code to plant in each task before waking it | |
472 | * | |
473 | */ | |
474 | void xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status) | |
475 | { | |
476 | if (status < 0) | |
477 | rpc_wake_up_status(&xprt->pending, status); | |
478 | else | |
479 | rpc_wake_up(&xprt->pending); | |
480 | } | |
12444809 | 481 | EXPORT_SYMBOL_GPL(xprt_wake_pending_tasks); |
44fbac22 | 482 | |
c7b2cae8 CL |
483 | /** |
484 | * xprt_wait_for_buffer_space - wait for transport output buffer to clear | |
485 | * @task: task to be put to sleep | |
0b80ae42 | 486 | * @action: function pointer to be executed after wait |
a9a6b52e TM |
487 | * |
488 | * Note that we only set the timer for the case of RPC_IS_SOFT(), since | |
489 | * we don't in general want to force a socket disconnection due to | |
490 | * an incomplete RPC call transmission. | |
c7b2cae8 | 491 | */ |
b6ddf64f | 492 | void xprt_wait_for_buffer_space(struct rpc_task *task, rpc_action action) |
c7b2cae8 CL |
493 | { |
494 | struct rpc_rqst *req = task->tk_rqstp; | |
495 | struct rpc_xprt *xprt = req->rq_xprt; | |
496 | ||
a9a6b52e | 497 | task->tk_timeout = RPC_IS_SOFT(task) ? req->rq_timeout : 0; |
b6ddf64f | 498 | rpc_sleep_on(&xprt->pending, task, action); |
c7b2cae8 | 499 | } |
12444809 | 500 | EXPORT_SYMBOL_GPL(xprt_wait_for_buffer_space); |
c7b2cae8 CL |
501 | |
502 | /** | |
503 | * xprt_write_space - wake the task waiting for transport output buffer space | |
504 | * @xprt: transport with waiting tasks | |
505 | * | |
506 | * Can be called in a soft IRQ context, so xprt_write_space never sleeps. | |
507 | */ | |
508 | void xprt_write_space(struct rpc_xprt *xprt) | |
509 | { | |
c7b2cae8 CL |
510 | spin_lock_bh(&xprt->transport_lock); |
511 | if (xprt->snd_task) { | |
46121cf7 CL |
512 | dprintk("RPC: write space: waking waiting task on " |
513 | "xprt %p\n", xprt); | |
fda13939 | 514 | rpc_wake_up_queued_task(&xprt->pending, xprt->snd_task); |
c7b2cae8 CL |
515 | } |
516 | spin_unlock_bh(&xprt->transport_lock); | |
517 | } | |
12444809 | 518 | EXPORT_SYMBOL_GPL(xprt_write_space); |
c7b2cae8 | 519 | |
fe3aca29 CL |
520 | /** |
521 | * xprt_set_retrans_timeout_def - set a request's retransmit timeout | |
522 | * @task: task whose timeout is to be set | |
523 | * | |
524 | * Set a request's retransmit timeout based on the transport's | |
525 | * default timeout parameters. Used by transports that don't adjust | |
526 | * the retransmit timeout based on round-trip time estimation. | |
527 | */ | |
528 | void xprt_set_retrans_timeout_def(struct rpc_task *task) | |
529 | { | |
530 | task->tk_timeout = task->tk_rqstp->rq_timeout; | |
531 | } | |
12444809 | 532 | EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_def); |
fe3aca29 | 533 | |
2c53040f | 534 | /** |
fe3aca29 CL |
535 | * xprt_set_retrans_timeout_rtt - set a request's retransmit timeout |
536 | * @task: task whose timeout is to be set | |
cca5172a | 537 | * |
fe3aca29 CL |
538 | * Set a request's retransmit timeout using the RTT estimator. |
539 | */ | |
540 | void xprt_set_retrans_timeout_rtt(struct rpc_task *task) | |
541 | { | |
542 | int timer = task->tk_msg.rpc_proc->p_timer; | |
ba7392bb TM |
543 | struct rpc_clnt *clnt = task->tk_client; |
544 | struct rpc_rtt *rtt = clnt->cl_rtt; | |
fe3aca29 | 545 | struct rpc_rqst *req = task->tk_rqstp; |
ba7392bb | 546 | unsigned long max_timeout = clnt->cl_timeout->to_maxval; |
fe3aca29 CL |
547 | |
548 | task->tk_timeout = rpc_calc_rto(rtt, timer); | |
549 | task->tk_timeout <<= rpc_ntimeo(rtt, timer) + req->rq_retries; | |
550 | if (task->tk_timeout > max_timeout || task->tk_timeout == 0) | |
551 | task->tk_timeout = max_timeout; | |
552 | } | |
12444809 | 553 | EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_rtt); |
fe3aca29 | 554 | |
1da177e4 LT |
555 | static void xprt_reset_majortimeo(struct rpc_rqst *req) |
556 | { | |
ba7392bb | 557 | const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout; |
1da177e4 LT |
558 | |
559 | req->rq_majortimeo = req->rq_timeout; | |
560 | if (to->to_exponential) | |
561 | req->rq_majortimeo <<= to->to_retries; | |
562 | else | |
563 | req->rq_majortimeo += to->to_increment * to->to_retries; | |
564 | if (req->rq_majortimeo > to->to_maxval || req->rq_majortimeo == 0) | |
565 | req->rq_majortimeo = to->to_maxval; | |
566 | req->rq_majortimeo += jiffies; | |
567 | } | |
568 | ||
9903cd1c CL |
569 | /** |
570 | * xprt_adjust_timeout - adjust timeout values for next retransmit | |
571 | * @req: RPC request containing parameters to use for the adjustment | |
572 | * | |
1da177e4 LT |
573 | */ |
574 | int xprt_adjust_timeout(struct rpc_rqst *req) | |
575 | { | |
576 | struct rpc_xprt *xprt = req->rq_xprt; | |
ba7392bb | 577 | const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout; |
1da177e4 LT |
578 | int status = 0; |
579 | ||
580 | if (time_before(jiffies, req->rq_majortimeo)) { | |
581 | if (to->to_exponential) | |
582 | req->rq_timeout <<= 1; | |
583 | else | |
584 | req->rq_timeout += to->to_increment; | |
585 | if (to->to_maxval && req->rq_timeout >= to->to_maxval) | |
586 | req->rq_timeout = to->to_maxval; | |
587 | req->rq_retries++; | |
1da177e4 LT |
588 | } else { |
589 | req->rq_timeout = to->to_initval; | |
590 | req->rq_retries = 0; | |
591 | xprt_reset_majortimeo(req); | |
592 | /* Reset the RTT counters == "slow start" */ | |
4a0f8c04 | 593 | spin_lock_bh(&xprt->transport_lock); |
1da177e4 | 594 | rpc_init_rtt(req->rq_task->tk_client->cl_rtt, to->to_initval); |
4a0f8c04 | 595 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 LT |
596 | status = -ETIMEDOUT; |
597 | } | |
598 | ||
599 | if (req->rq_timeout == 0) { | |
600 | printk(KERN_WARNING "xprt_adjust_timeout: rq_timeout = 0!\n"); | |
601 | req->rq_timeout = 5 * HZ; | |
602 | } | |
603 | return status; | |
604 | } | |
605 | ||
65f27f38 | 606 | static void xprt_autoclose(struct work_struct *work) |
1da177e4 | 607 | { |
65f27f38 DH |
608 | struct rpc_xprt *xprt = |
609 | container_of(work, struct rpc_xprt, task_cleanup); | |
1da177e4 | 610 | |
a246b010 | 611 | xprt->ops->close(xprt); |
66af1e55 | 612 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
1da177e4 LT |
613 | xprt_release_write(xprt, NULL); |
614 | } | |
615 | ||
9903cd1c | 616 | /** |
62da3b24 | 617 | * xprt_disconnect_done - mark a transport as disconnected |
9903cd1c CL |
618 | * @xprt: transport to flag for disconnect |
619 | * | |
1da177e4 | 620 | */ |
62da3b24 | 621 | void xprt_disconnect_done(struct rpc_xprt *xprt) |
1da177e4 | 622 | { |
46121cf7 | 623 | dprintk("RPC: disconnected transport %p\n", xprt); |
4a0f8c04 | 624 | spin_lock_bh(&xprt->transport_lock); |
1da177e4 | 625 | xprt_clear_connected(xprt); |
2a491991 | 626 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
4a0f8c04 | 627 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 | 628 | } |
62da3b24 | 629 | EXPORT_SYMBOL_GPL(xprt_disconnect_done); |
1da177e4 | 630 | |
66af1e55 TM |
631 | /** |
632 | * xprt_force_disconnect - force a transport to disconnect | |
633 | * @xprt: transport to disconnect | |
634 | * | |
635 | */ | |
636 | void xprt_force_disconnect(struct rpc_xprt *xprt) | |
637 | { | |
638 | /* Don't race with the test_bit() in xprt_clear_locked() */ | |
639 | spin_lock_bh(&xprt->transport_lock); | |
640 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
641 | /* Try to schedule an autoclose RPC call */ | |
642 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) | |
643 | queue_work(rpciod_workqueue, &xprt->task_cleanup); | |
2a491991 | 644 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
66af1e55 TM |
645 | spin_unlock_bh(&xprt->transport_lock); |
646 | } | |
66af1e55 | 647 | |
7c1d71cf TM |
648 | /** |
649 | * xprt_conditional_disconnect - force a transport to disconnect | |
650 | * @xprt: transport to disconnect | |
651 | * @cookie: 'connection cookie' | |
652 | * | |
653 | * This attempts to break the connection if and only if 'cookie' matches | |
654 | * the current transport 'connection cookie'. It ensures that we don't | |
655 | * try to break the connection more than once when we need to retransmit | |
656 | * a batch of RPC requests. | |
657 | * | |
658 | */ | |
659 | void xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie) | |
660 | { | |
661 | /* Don't race with the test_bit() in xprt_clear_locked() */ | |
662 | spin_lock_bh(&xprt->transport_lock); | |
663 | if (cookie != xprt->connect_cookie) | |
664 | goto out; | |
665 | if (test_bit(XPRT_CLOSING, &xprt->state) || !xprt_connected(xprt)) | |
666 | goto out; | |
667 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
668 | /* Try to schedule an autoclose RPC call */ | |
669 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) | |
670 | queue_work(rpciod_workqueue, &xprt->task_cleanup); | |
2a491991 | 671 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
7c1d71cf TM |
672 | out: |
673 | spin_unlock_bh(&xprt->transport_lock); | |
674 | } | |
675 | ||
1da177e4 LT |
676 | static void |
677 | xprt_init_autodisconnect(unsigned long data) | |
678 | { | |
679 | struct rpc_xprt *xprt = (struct rpc_xprt *)data; | |
680 | ||
4a0f8c04 | 681 | spin_lock(&xprt->transport_lock); |
d19751e7 | 682 | if (!list_empty(&xprt->recv)) |
1da177e4 | 683 | goto out_abort; |
2226feb6 | 684 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) |
1da177e4 | 685 | goto out_abort; |
4a0f8c04 | 686 | spin_unlock(&xprt->transport_lock); |
f75e6745 | 687 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
1da177e4 LT |
688 | return; |
689 | out_abort: | |
4a0f8c04 | 690 | spin_unlock(&xprt->transport_lock); |
1da177e4 LT |
691 | } |
692 | ||
718ba5b8 TM |
693 | bool xprt_lock_connect(struct rpc_xprt *xprt, |
694 | struct rpc_task *task, | |
695 | void *cookie) | |
696 | { | |
697 | bool ret = false; | |
698 | ||
699 | spin_lock_bh(&xprt->transport_lock); | |
700 | if (!test_bit(XPRT_LOCKED, &xprt->state)) | |
701 | goto out; | |
702 | if (xprt->snd_task != task) | |
703 | goto out; | |
0695314e | 704 | xprt_task_clear_bytes_sent(task); |
718ba5b8 TM |
705 | xprt->snd_task = cookie; |
706 | ret = true; | |
707 | out: | |
708 | spin_unlock_bh(&xprt->transport_lock); | |
709 | return ret; | |
710 | } | |
711 | ||
712 | void xprt_unlock_connect(struct rpc_xprt *xprt, void *cookie) | |
713 | { | |
714 | spin_lock_bh(&xprt->transport_lock); | |
715 | if (xprt->snd_task != cookie) | |
716 | goto out; | |
717 | if (!test_bit(XPRT_LOCKED, &xprt->state)) | |
718 | goto out; | |
719 | xprt->snd_task =NULL; | |
720 | xprt->ops->release_xprt(xprt, NULL); | |
721 | out: | |
722 | spin_unlock_bh(&xprt->transport_lock); | |
723 | } | |
724 | ||
9903cd1c CL |
725 | /** |
726 | * xprt_connect - schedule a transport connect operation | |
727 | * @task: RPC task that is requesting the connect | |
1da177e4 LT |
728 | * |
729 | */ | |
730 | void xprt_connect(struct rpc_task *task) | |
731 | { | |
ad2368d6 | 732 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
1da177e4 | 733 | |
46121cf7 | 734 | dprintk("RPC: %5u xprt_connect xprt %p %s connected\n", task->tk_pid, |
1da177e4 LT |
735 | xprt, (xprt_connected(xprt) ? "is" : "is not")); |
736 | ||
ec739ef0 | 737 | if (!xprt_bound(xprt)) { |
01d37c42 | 738 | task->tk_status = -EAGAIN; |
1da177e4 LT |
739 | return; |
740 | } | |
741 | if (!xprt_lock_write(xprt, task)) | |
742 | return; | |
feb8ca37 TM |
743 | |
744 | if (test_and_clear_bit(XPRT_CLOSE_WAIT, &xprt->state)) | |
745 | xprt->ops->close(xprt); | |
746 | ||
718ba5b8 | 747 | if (!xprt_connected(xprt)) { |
87e3c055 | 748 | task->tk_rqstp->rq_bytes_sent = 0; |
a8ce4a8f | 749 | task->tk_timeout = task->tk_rqstp->rq_timeout; |
5d00837b | 750 | rpc_sleep_on(&xprt->pending, task, xprt_connect_status); |
0b9e7943 TM |
751 | |
752 | if (test_bit(XPRT_CLOSING, &xprt->state)) | |
753 | return; | |
754 | if (xprt_test_and_set_connecting(xprt)) | |
755 | return; | |
262ca07d | 756 | xprt->stat.connect_start = jiffies; |
1b092092 | 757 | xprt->ops->connect(xprt, task); |
1da177e4 | 758 | } |
718ba5b8 | 759 | xprt_release_write(xprt, task); |
1da177e4 LT |
760 | } |
761 | ||
9903cd1c | 762 | static void xprt_connect_status(struct rpc_task *task) |
1da177e4 | 763 | { |
ad2368d6 | 764 | struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; |
1da177e4 | 765 | |
cd983ef8 | 766 | if (task->tk_status == 0) { |
262ca07d CL |
767 | xprt->stat.connect_count++; |
768 | xprt->stat.connect_time += (long)jiffies - xprt->stat.connect_start; | |
46121cf7 | 769 | dprintk("RPC: %5u xprt_connect_status: connection established\n", |
1da177e4 LT |
770 | task->tk_pid); |
771 | return; | |
772 | } | |
773 | ||
1da177e4 | 774 | switch (task->tk_status) { |
0fe8d04e TM |
775 | case -ECONNREFUSED: |
776 | case -ECONNRESET: | |
777 | case -ECONNABORTED: | |
778 | case -ENETUNREACH: | |
779 | case -EHOSTUNREACH: | |
2fc193cf | 780 | case -EPIPE: |
2a491991 TM |
781 | case -EAGAIN: |
782 | dprintk("RPC: %5u xprt_connect_status: retrying\n", task->tk_pid); | |
23475d66 | 783 | break; |
1da177e4 | 784 | case -ETIMEDOUT: |
46121cf7 CL |
785 | dprintk("RPC: %5u xprt_connect_status: connect attempt timed " |
786 | "out\n", task->tk_pid); | |
1da177e4 LT |
787 | break; |
788 | default: | |
46121cf7 CL |
789 | dprintk("RPC: %5u xprt_connect_status: error %d connecting to " |
790 | "server %s\n", task->tk_pid, -task->tk_status, | |
4e0038b6 | 791 | xprt->servername); |
23475d66 | 792 | task->tk_status = -EIO; |
1da177e4 | 793 | } |
1da177e4 LT |
794 | } |
795 | ||
9903cd1c CL |
796 | /** |
797 | * xprt_lookup_rqst - find an RPC request corresponding to an XID | |
798 | * @xprt: transport on which the original request was transmitted | |
799 | * @xid: RPC XID of incoming reply | |
800 | * | |
1da177e4 | 801 | */ |
d8ed029d | 802 | struct rpc_rqst *xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid) |
1da177e4 | 803 | { |
8f3a6de3 | 804 | struct rpc_rqst *entry; |
1da177e4 | 805 | |
8f3a6de3 | 806 | list_for_each_entry(entry, &xprt->recv, rq_list) |
3705ad64 JL |
807 | if (entry->rq_xid == xid) { |
808 | trace_xprt_lookup_rqst(xprt, xid, 0); | |
262ca07d | 809 | return entry; |
3705ad64 | 810 | } |
46121cf7 CL |
811 | |
812 | dprintk("RPC: xprt_lookup_rqst did not find xid %08x\n", | |
813 | ntohl(xid)); | |
3705ad64 | 814 | trace_xprt_lookup_rqst(xprt, xid, -ENOENT); |
262ca07d CL |
815 | xprt->stat.bad_xids++; |
816 | return NULL; | |
1da177e4 | 817 | } |
12444809 | 818 | EXPORT_SYMBOL_GPL(xprt_lookup_rqst); |
1da177e4 | 819 | |
bbc72cea | 820 | static void xprt_update_rtt(struct rpc_task *task) |
1570c1e4 CL |
821 | { |
822 | struct rpc_rqst *req = task->tk_rqstp; | |
823 | struct rpc_rtt *rtt = task->tk_client->cl_rtt; | |
95c96174 | 824 | unsigned int timer = task->tk_msg.rpc_proc->p_timer; |
d60dbb20 | 825 | long m = usecs_to_jiffies(ktime_to_us(req->rq_rtt)); |
1570c1e4 CL |
826 | |
827 | if (timer) { | |
828 | if (req->rq_ntrans == 1) | |
ff839970 | 829 | rpc_update_rtt(rtt, timer, m); |
1570c1e4 CL |
830 | rpc_set_timeo(rtt, timer, req->rq_ntrans - 1); |
831 | } | |
832 | } | |
833 | ||
9903cd1c CL |
834 | /** |
835 | * xprt_complete_rqst - called when reply processing is complete | |
1570c1e4 | 836 | * @task: RPC request that recently completed |
9903cd1c CL |
837 | * @copied: actual number of bytes received from the transport |
838 | * | |
1570c1e4 | 839 | * Caller holds transport lock. |
1da177e4 | 840 | */ |
1570c1e4 | 841 | void xprt_complete_rqst(struct rpc_task *task, int copied) |
1da177e4 | 842 | { |
1570c1e4 | 843 | struct rpc_rqst *req = task->tk_rqstp; |
fda13939 | 844 | struct rpc_xprt *xprt = req->rq_xprt; |
1da177e4 | 845 | |
1570c1e4 CL |
846 | dprintk("RPC: %5u xid %08x complete (%d bytes received)\n", |
847 | task->tk_pid, ntohl(req->rq_xid), copied); | |
3705ad64 | 848 | trace_xprt_complete_rqst(xprt, req->rq_xid, copied); |
1da177e4 | 849 | |
fda13939 | 850 | xprt->stat.recvs++; |
d60dbb20 | 851 | req->rq_rtt = ktime_sub(ktime_get(), req->rq_xtime); |
bbc72cea CL |
852 | if (xprt->ops->timer != NULL) |
853 | xprt_update_rtt(task); | |
ef759a2e | 854 | |
1da177e4 | 855 | list_del_init(&req->rq_list); |
1e799b67 | 856 | req->rq_private_buf.len = copied; |
dd2b63d0 RL |
857 | /* Ensure all writes are done before we update */ |
858 | /* req->rq_reply_bytes_recvd */ | |
43ac3f29 | 859 | smp_wmb(); |
dd2b63d0 | 860 | req->rq_reply_bytes_recvd = copied; |
fda13939 | 861 | rpc_wake_up_queued_task(&xprt->pending, task); |
1da177e4 | 862 | } |
12444809 | 863 | EXPORT_SYMBOL_GPL(xprt_complete_rqst); |
1da177e4 | 864 | |
46c0ee8b | 865 | static void xprt_timer(struct rpc_task *task) |
1da177e4 | 866 | { |
46c0ee8b | 867 | struct rpc_rqst *req = task->tk_rqstp; |
1da177e4 LT |
868 | struct rpc_xprt *xprt = req->rq_xprt; |
869 | ||
5d00837b TM |
870 | if (task->tk_status != -ETIMEDOUT) |
871 | return; | |
46121cf7 | 872 | dprintk("RPC: %5u xprt_timer\n", task->tk_pid); |
1da177e4 | 873 | |
5d00837b | 874 | spin_lock_bh(&xprt->transport_lock); |
dd2b63d0 | 875 | if (!req->rq_reply_bytes_recvd) { |
46c0ee8b | 876 | if (xprt->ops->timer) |
6a24dfb6 | 877 | xprt->ops->timer(xprt, task); |
5d00837b TM |
878 | } else |
879 | task->tk_status = 0; | |
880 | spin_unlock_bh(&xprt->transport_lock); | |
1da177e4 LT |
881 | } |
882 | ||
4cfc7e60 RI |
883 | static inline int xprt_has_timer(struct rpc_xprt *xprt) |
884 | { | |
885 | return xprt->idle_timeout != 0; | |
886 | } | |
887 | ||
9903cd1c CL |
888 | /** |
889 | * xprt_prepare_transmit - reserve the transport before sending a request | |
890 | * @task: RPC task about to send a request | |
891 | * | |
1da177e4 | 892 | */ |
90051ea7 | 893 | bool xprt_prepare_transmit(struct rpc_task *task) |
1da177e4 LT |
894 | { |
895 | struct rpc_rqst *req = task->tk_rqstp; | |
896 | struct rpc_xprt *xprt = req->rq_xprt; | |
90051ea7 | 897 | bool ret = false; |
1da177e4 | 898 | |
46121cf7 | 899 | dprintk("RPC: %5u xprt_prepare_transmit\n", task->tk_pid); |
1da177e4 | 900 | |
4a0f8c04 | 901 | spin_lock_bh(&xprt->transport_lock); |
8a19a0b6 TM |
902 | if (!req->rq_bytes_sent) { |
903 | if (req->rq_reply_bytes_recvd) { | |
904 | task->tk_status = req->rq_reply_bytes_recvd; | |
905 | goto out_unlock; | |
906 | } | |
907 | if ((task->tk_flags & RPC_TASK_NO_RETRANS_TIMEOUT) | |
908 | && xprt_connected(xprt) | |
909 | && req->rq_connect_cookie == xprt->connect_cookie) { | |
910 | xprt->ops->set_retrans_timeout(task); | |
911 | rpc_sleep_on(&xprt->pending, task, xprt_timer); | |
912 | goto out_unlock; | |
913 | } | |
1da177e4 | 914 | } |
90051ea7 TM |
915 | if (!xprt->ops->reserve_xprt(xprt, task)) { |
916 | task->tk_status = -EAGAIN; | |
917 | goto out_unlock; | |
918 | } | |
919 | ret = true; | |
1da177e4 | 920 | out_unlock: |
4a0f8c04 | 921 | spin_unlock_bh(&xprt->transport_lock); |
90051ea7 | 922 | return ret; |
1da177e4 LT |
923 | } |
924 | ||
e0ab53de | 925 | void xprt_end_transmit(struct rpc_task *task) |
5e5ce5be | 926 | { |
343952fa | 927 | xprt_release_write(task->tk_rqstp->rq_xprt, task); |
5e5ce5be TM |
928 | } |
929 | ||
9903cd1c CL |
930 | /** |
931 | * xprt_transmit - send an RPC request on a transport | |
932 | * @task: controlling RPC task | |
933 | * | |
934 | * We have to copy the iovec because sendmsg fiddles with its contents. | |
935 | */ | |
936 | void xprt_transmit(struct rpc_task *task) | |
1da177e4 | 937 | { |
1da177e4 LT |
938 | struct rpc_rqst *req = task->tk_rqstp; |
939 | struct rpc_xprt *xprt = req->rq_xprt; | |
15a45206 | 940 | int status, numreqs; |
1da177e4 | 941 | |
46121cf7 | 942 | dprintk("RPC: %5u xprt_transmit(%u)\n", task->tk_pid, req->rq_slen); |
1da177e4 | 943 | |
dd2b63d0 | 944 | if (!req->rq_reply_bytes_recvd) { |
55ae1aab RL |
945 | if (list_empty(&req->rq_list) && rpc_reply_expected(task)) { |
946 | /* | |
947 | * Add to the list only if we're expecting a reply | |
948 | */ | |
4a0f8c04 | 949 | spin_lock_bh(&xprt->transport_lock); |
1da177e4 LT |
950 | /* Update the softirq receive buffer */ |
951 | memcpy(&req->rq_private_buf, &req->rq_rcv_buf, | |
952 | sizeof(req->rq_private_buf)); | |
953 | /* Add request to the receive list */ | |
954 | list_add_tail(&req->rq_list, &xprt->recv); | |
4a0f8c04 | 955 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 | 956 | xprt_reset_majortimeo(req); |
0f9dc2b1 TM |
957 | /* Turn off autodisconnect */ |
958 | del_singleshot_timer_sync(&xprt->timer); | |
1da177e4 LT |
959 | } |
960 | } else if (!req->rq_bytes_sent) | |
961 | return; | |
962 | ||
ff839970 | 963 | req->rq_xtime = ktime_get(); |
a246b010 | 964 | status = xprt->ops->send_request(task); |
3705ad64 | 965 | trace_xprt_transmit(xprt, req->rq_xid, status); |
c8485e4d TM |
966 | if (status != 0) { |
967 | task->tk_status = status; | |
968 | return; | |
969 | } | |
4a068258 | 970 | xprt_inject_disconnect(xprt); |
262ca07d | 971 | |
c8485e4d | 972 | dprintk("RPC: %5u xmit complete\n", task->tk_pid); |
468f8613 | 973 | task->tk_flags |= RPC_TASK_SENT; |
c8485e4d | 974 | spin_lock_bh(&xprt->transport_lock); |
262ca07d | 975 | |
c8485e4d | 976 | xprt->ops->set_retrans_timeout(task); |
262ca07d | 977 | |
15a45206 AA |
978 | numreqs = atomic_read(&xprt->num_reqs); |
979 | if (numreqs > xprt->stat.max_slots) | |
980 | xprt->stat.max_slots = numreqs; | |
c8485e4d TM |
981 | xprt->stat.sends++; |
982 | xprt->stat.req_u += xprt->stat.sends - xprt->stat.recvs; | |
983 | xprt->stat.bklog_u += xprt->backlog.qlen; | |
15a45206 AA |
984 | xprt->stat.sending_u += xprt->sending.qlen; |
985 | xprt->stat.pending_u += xprt->pending.qlen; | |
1da177e4 | 986 | |
c8485e4d TM |
987 | /* Don't race with disconnect */ |
988 | if (!xprt_connected(xprt)) | |
989 | task->tk_status = -ENOTCONN; | |
0a660521 | 990 | else { |
55ae1aab RL |
991 | /* |
992 | * Sleep on the pending queue since | |
993 | * we're expecting a reply. | |
994 | */ | |
0a660521 TM |
995 | if (!req->rq_reply_bytes_recvd && rpc_reply_expected(task)) |
996 | rpc_sleep_on(&xprt->pending, task, xprt_timer); | |
997 | req->rq_connect_cookie = xprt->connect_cookie; | |
55ae1aab | 998 | } |
c8485e4d | 999 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 LT |
1000 | } |
1001 | ||
ba60eb25 TM |
1002 | static void xprt_add_backlog(struct rpc_xprt *xprt, struct rpc_task *task) |
1003 | { | |
1004 | set_bit(XPRT_CONGESTED, &xprt->state); | |
1005 | rpc_sleep_on(&xprt->backlog, task, NULL); | |
1006 | } | |
1007 | ||
1008 | static void xprt_wake_up_backlog(struct rpc_xprt *xprt) | |
1009 | { | |
1010 | if (rpc_wake_up_next(&xprt->backlog) == NULL) | |
1011 | clear_bit(XPRT_CONGESTED, &xprt->state); | |
1012 | } | |
1013 | ||
1014 | static bool xprt_throttle_congested(struct rpc_xprt *xprt, struct rpc_task *task) | |
1015 | { | |
1016 | bool ret = false; | |
1017 | ||
1018 | if (!test_bit(XPRT_CONGESTED, &xprt->state)) | |
1019 | goto out; | |
1020 | spin_lock(&xprt->reserve_lock); | |
1021 | if (test_bit(XPRT_CONGESTED, &xprt->state)) { | |
1022 | rpc_sleep_on(&xprt->backlog, task, NULL); | |
1023 | ret = true; | |
1024 | } | |
1025 | spin_unlock(&xprt->reserve_lock); | |
1026 | out: | |
1027 | return ret; | |
1028 | } | |
1029 | ||
d9ba131d TM |
1030 | static struct rpc_rqst *xprt_dynamic_alloc_slot(struct rpc_xprt *xprt, gfp_t gfp_flags) |
1031 | { | |
1032 | struct rpc_rqst *req = ERR_PTR(-EAGAIN); | |
1033 | ||
1034 | if (!atomic_add_unless(&xprt->num_reqs, 1, xprt->max_reqs)) | |
1035 | goto out; | |
1036 | req = kzalloc(sizeof(struct rpc_rqst), gfp_flags); | |
1037 | if (req != NULL) | |
1038 | goto out; | |
1039 | atomic_dec(&xprt->num_reqs); | |
1040 | req = ERR_PTR(-ENOMEM); | |
1041 | out: | |
1042 | return req; | |
1043 | } | |
1044 | ||
1045 | static bool xprt_dynamic_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *req) | |
1046 | { | |
1047 | if (atomic_add_unless(&xprt->num_reqs, -1, xprt->min_reqs)) { | |
1048 | kfree(req); | |
1049 | return true; | |
1050 | } | |
1051 | return false; | |
1052 | } | |
1053 | ||
f39c1bfb | 1054 | void xprt_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task) |
1da177e4 | 1055 | { |
d9ba131d | 1056 | struct rpc_rqst *req; |
1da177e4 | 1057 | |
f39c1bfb | 1058 | spin_lock(&xprt->reserve_lock); |
1da177e4 | 1059 | if (!list_empty(&xprt->free)) { |
d9ba131d TM |
1060 | req = list_entry(xprt->free.next, struct rpc_rqst, rq_list); |
1061 | list_del(&req->rq_list); | |
1062 | goto out_init_req; | |
1063 | } | |
6b343099 | 1064 | req = xprt_dynamic_alloc_slot(xprt, GFP_NOWAIT|__GFP_NOWARN); |
d9ba131d TM |
1065 | if (!IS_ERR(req)) |
1066 | goto out_init_req; | |
1067 | switch (PTR_ERR(req)) { | |
1068 | case -ENOMEM: | |
d9ba131d TM |
1069 | dprintk("RPC: dynamic allocation of request slot " |
1070 | "failed! Retrying\n"); | |
1afeaf5c | 1071 | task->tk_status = -ENOMEM; |
d9ba131d TM |
1072 | break; |
1073 | case -EAGAIN: | |
ba60eb25 | 1074 | xprt_add_backlog(xprt, task); |
d9ba131d | 1075 | dprintk("RPC: waiting for request slot\n"); |
1afeaf5c TM |
1076 | default: |
1077 | task->tk_status = -EAGAIN; | |
1da177e4 | 1078 | } |
f39c1bfb | 1079 | spin_unlock(&xprt->reserve_lock); |
d9ba131d TM |
1080 | return; |
1081 | out_init_req: | |
1082 | task->tk_status = 0; | |
1083 | task->tk_rqstp = req; | |
1084 | xprt_request_init(task, xprt); | |
f39c1bfb TM |
1085 | spin_unlock(&xprt->reserve_lock); |
1086 | } | |
1087 | EXPORT_SYMBOL_GPL(xprt_alloc_slot); | |
1088 | ||
1089 | void xprt_lock_and_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task) | |
1090 | { | |
1091 | /* Note: grabbing the xprt_lock_write() ensures that we throttle | |
1092 | * new slot allocation if the transport is congested (i.e. when | |
1093 | * reconnecting a stream transport or when out of socket write | |
1094 | * buffer space). | |
1095 | */ | |
1096 | if (xprt_lock_write(xprt, task)) { | |
1097 | xprt_alloc_slot(xprt, task); | |
1098 | xprt_release_write(xprt, task); | |
1099 | } | |
1da177e4 | 1100 | } |
f39c1bfb | 1101 | EXPORT_SYMBOL_GPL(xprt_lock_and_alloc_slot); |
1da177e4 | 1102 | |
ee5ebe85 TM |
1103 | static void xprt_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *req) |
1104 | { | |
ee5ebe85 | 1105 | spin_lock(&xprt->reserve_lock); |
c25573b5 TM |
1106 | if (!xprt_dynamic_free_slot(xprt, req)) { |
1107 | memset(req, 0, sizeof(*req)); /* mark unused */ | |
1108 | list_add(&req->rq_list, &xprt->free); | |
1109 | } | |
ba60eb25 | 1110 | xprt_wake_up_backlog(xprt); |
ee5ebe85 TM |
1111 | spin_unlock(&xprt->reserve_lock); |
1112 | } | |
1113 | ||
21de0a95 TM |
1114 | static void xprt_free_all_slots(struct rpc_xprt *xprt) |
1115 | { | |
1116 | struct rpc_rqst *req; | |
1117 | while (!list_empty(&xprt->free)) { | |
1118 | req = list_first_entry(&xprt->free, struct rpc_rqst, rq_list); | |
1119 | list_del(&req->rq_list); | |
1120 | kfree(req); | |
1121 | } | |
1122 | } | |
1123 | ||
d9ba131d TM |
1124 | struct rpc_xprt *xprt_alloc(struct net *net, size_t size, |
1125 | unsigned int num_prealloc, | |
1126 | unsigned int max_alloc) | |
bd1722d4 PE |
1127 | { |
1128 | struct rpc_xprt *xprt; | |
21de0a95 TM |
1129 | struct rpc_rqst *req; |
1130 | int i; | |
bd1722d4 PE |
1131 | |
1132 | xprt = kzalloc(size, GFP_KERNEL); | |
1133 | if (xprt == NULL) | |
1134 | goto out; | |
1135 | ||
21de0a95 TM |
1136 | xprt_init(xprt, net); |
1137 | ||
1138 | for (i = 0; i < num_prealloc; i++) { | |
1139 | req = kzalloc(sizeof(struct rpc_rqst), GFP_KERNEL); | |
1140 | if (!req) | |
8313164c | 1141 | goto out_free; |
21de0a95 TM |
1142 | list_add(&req->rq_list, &xprt->free); |
1143 | } | |
d9ba131d TM |
1144 | if (max_alloc > num_prealloc) |
1145 | xprt->max_reqs = max_alloc; | |
1146 | else | |
1147 | xprt->max_reqs = num_prealloc; | |
1148 | xprt->min_reqs = num_prealloc; | |
1149 | atomic_set(&xprt->num_reqs, num_prealloc); | |
bd1722d4 PE |
1150 | |
1151 | return xprt; | |
1152 | ||
1153 | out_free: | |
21de0a95 | 1154 | xprt_free(xprt); |
bd1722d4 PE |
1155 | out: |
1156 | return NULL; | |
1157 | } | |
1158 | EXPORT_SYMBOL_GPL(xprt_alloc); | |
1159 | ||
e204e621 PE |
1160 | void xprt_free(struct rpc_xprt *xprt) |
1161 | { | |
37aa2133 | 1162 | put_net(xprt->xprt_net); |
21de0a95 | 1163 | xprt_free_all_slots(xprt); |
e204e621 PE |
1164 | kfree(xprt); |
1165 | } | |
1166 | EXPORT_SYMBOL_GPL(xprt_free); | |
1167 | ||
9903cd1c CL |
1168 | /** |
1169 | * xprt_reserve - allocate an RPC request slot | |
1170 | * @task: RPC task requesting a slot allocation | |
1171 | * | |
ba60eb25 TM |
1172 | * If the transport is marked as being congested, or if no more |
1173 | * slots are available, place the task on the transport's | |
9903cd1c CL |
1174 | * backlog queue. |
1175 | */ | |
1176 | void xprt_reserve(struct rpc_task *task) | |
1da177e4 | 1177 | { |
45bc0dce | 1178 | struct rpc_xprt *xprt; |
1da177e4 | 1179 | |
43cedbf0 TM |
1180 | task->tk_status = 0; |
1181 | if (task->tk_rqstp != NULL) | |
1182 | return; | |
1183 | ||
43cedbf0 TM |
1184 | task->tk_timeout = 0; |
1185 | task->tk_status = -EAGAIN; | |
45bc0dce TM |
1186 | rcu_read_lock(); |
1187 | xprt = rcu_dereference(task->tk_client->cl_xprt); | |
ba60eb25 TM |
1188 | if (!xprt_throttle_congested(xprt, task)) |
1189 | xprt->ops->alloc_slot(xprt, task); | |
1190 | rcu_read_unlock(); | |
1191 | } | |
1192 | ||
1193 | /** | |
1194 | * xprt_retry_reserve - allocate an RPC request slot | |
1195 | * @task: RPC task requesting a slot allocation | |
1196 | * | |
1197 | * If no more slots are available, place the task on the transport's | |
1198 | * backlog queue. | |
1199 | * Note that the only difference with xprt_reserve is that we now | |
1200 | * ignore the value of the XPRT_CONGESTED flag. | |
1201 | */ | |
1202 | void xprt_retry_reserve(struct rpc_task *task) | |
1203 | { | |
1204 | struct rpc_xprt *xprt; | |
1205 | ||
1206 | task->tk_status = 0; | |
1207 | if (task->tk_rqstp != NULL) | |
1208 | return; | |
1209 | ||
1210 | task->tk_timeout = 0; | |
1211 | task->tk_status = -EAGAIN; | |
1212 | rcu_read_lock(); | |
1213 | xprt = rcu_dereference(task->tk_client->cl_xprt); | |
f39c1bfb | 1214 | xprt->ops->alloc_slot(xprt, task); |
45bc0dce | 1215 | rcu_read_unlock(); |
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) { | |
1262 | rcu_read_lock(); | |
1263 | xprt = rcu_dereference(task->tk_client->cl_xprt); | |
1264 | if (xprt->snd_task == task) | |
1265 | xprt_release_write(xprt, task); | |
1266 | rcu_read_unlock(); | |
1267 | } | |
1da177e4 | 1268 | return; |
87ed5003 | 1269 | } |
55ae1aab | 1270 | |
55ae1aab | 1271 | xprt = req->rq_xprt; |
0a702195 WAA |
1272 | if (task->tk_ops->rpc_count_stats != NULL) |
1273 | task->tk_ops->rpc_count_stats(task, task->tk_calldata); | |
1274 | else if (task->tk_client) | |
1275 | rpc_count_iostats(task, task->tk_client->cl_metrics); | |
4a0f8c04 | 1276 | spin_lock_bh(&xprt->transport_lock); |
49e9a890 | 1277 | xprt->ops->release_xprt(xprt, task); |
a58dd398 CL |
1278 | if (xprt->ops->release_request) |
1279 | xprt->ops->release_request(task); | |
1da177e4 LT |
1280 | if (!list_empty(&req->rq_list)) |
1281 | list_del(&req->rq_list); | |
1282 | xprt->last_used = jiffies; | |
4cfc7e60 | 1283 | if (list_empty(&xprt->recv) && xprt_has_timer(xprt)) |
a246b010 | 1284 | mod_timer(&xprt->timer, |
03bf4b70 | 1285 | xprt->last_used + xprt->idle_timeout); |
4a0f8c04 | 1286 | spin_unlock_bh(&xprt->transport_lock); |
ee5ebe85 | 1287 | if (req->rq_buffer) |
55ae1aab | 1288 | xprt->ops->buf_free(req->rq_buffer); |
4a068258 | 1289 | xprt_inject_disconnect(xprt); |
a17c2153 TM |
1290 | if (req->rq_cred != NULL) |
1291 | put_rpccred(req->rq_cred); | |
1da177e4 | 1292 | task->tk_rqstp = NULL; |
ead5e1c2 BF |
1293 | if (req->rq_release_snd_buf) |
1294 | req->rq_release_snd_buf(req); | |
55ae1aab | 1295 | |
46121cf7 | 1296 | dprintk("RPC: %5u release request %p\n", task->tk_pid, req); |
ee5ebe85 TM |
1297 | if (likely(!bc_prealloc(req))) |
1298 | xprt_free_slot(xprt, req); | |
1299 | else | |
c9acb42e | 1300 | xprt_free_bc_request(req); |
1da177e4 LT |
1301 | } |
1302 | ||
21de0a95 | 1303 | static void xprt_init(struct rpc_xprt *xprt, struct net *net) |
c2866763 | 1304 | { |
21de0a95 | 1305 | atomic_set(&xprt->count, 1); |
c2866763 CL |
1306 | |
1307 | spin_lock_init(&xprt->transport_lock); | |
1308 | spin_lock_init(&xprt->reserve_lock); | |
1309 | ||
1310 | INIT_LIST_HEAD(&xprt->free); | |
1311 | INIT_LIST_HEAD(&xprt->recv); | |
9e00abc3 | 1312 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
f9acac1a RL |
1313 | spin_lock_init(&xprt->bc_pa_lock); |
1314 | INIT_LIST_HEAD(&xprt->bc_pa_list); | |
9e00abc3 | 1315 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
f9acac1a | 1316 | |
c2866763 CL |
1317 | xprt->last_used = jiffies; |
1318 | xprt->cwnd = RPC_INITCWND; | |
a509050b | 1319 | xprt->bind_index = 0; |
c2866763 CL |
1320 | |
1321 | rpc_init_wait_queue(&xprt->binding, "xprt_binding"); | |
1322 | rpc_init_wait_queue(&xprt->pending, "xprt_pending"); | |
34006cee | 1323 | rpc_init_priority_wait_queue(&xprt->sending, "xprt_sending"); |
c2866763 CL |
1324 | rpc_init_priority_wait_queue(&xprt->backlog, "xprt_backlog"); |
1325 | ||
c2866763 CL |
1326 | xprt_init_xid(xprt); |
1327 | ||
21de0a95 | 1328 | xprt->xprt_net = get_net(net); |
8d9266ff TM |
1329 | } |
1330 | ||
1331 | /** | |
1332 | * xprt_create_transport - create an RPC transport | |
1333 | * @args: rpc transport creation arguments | |
1334 | * | |
1335 | */ | |
1336 | struct rpc_xprt *xprt_create_transport(struct xprt_create *args) | |
1337 | { | |
1338 | struct rpc_xprt *xprt; | |
1339 | struct xprt_class *t; | |
1340 | ||
1341 | spin_lock(&xprt_list_lock); | |
1342 | list_for_each_entry(t, &xprt_list, list) { | |
1343 | if (t->ident == args->ident) { | |
1344 | spin_unlock(&xprt_list_lock); | |
1345 | goto found; | |
1346 | } | |
1347 | } | |
1348 | spin_unlock(&xprt_list_lock); | |
3c45ddf8 | 1349 | dprintk("RPC: transport (%d) not supported\n", args->ident); |
8d9266ff TM |
1350 | return ERR_PTR(-EIO); |
1351 | ||
1352 | found: | |
1353 | xprt = t->setup(args); | |
1354 | if (IS_ERR(xprt)) { | |
1355 | dprintk("RPC: xprt_create_transport: failed, %ld\n", | |
1356 | -PTR_ERR(xprt)); | |
21de0a95 | 1357 | goto out; |
8d9266ff | 1358 | } |
33d90ac0 BF |
1359 | if (args->flags & XPRT_CREATE_NO_IDLE_TIMEOUT) |
1360 | xprt->idle_timeout = 0; | |
21de0a95 TM |
1361 | INIT_WORK(&xprt->task_cleanup, xprt_autoclose); |
1362 | if (xprt_has_timer(xprt)) | |
1363 | setup_timer(&xprt->timer, xprt_init_autodisconnect, | |
1364 | (unsigned long)xprt); | |
1365 | else | |
1366 | init_timer(&xprt->timer); | |
4e0038b6 TM |
1367 | |
1368 | if (strlen(args->servername) > RPC_MAXNETNAMELEN) { | |
1369 | xprt_destroy(xprt); | |
1370 | return ERR_PTR(-EINVAL); | |
1371 | } | |
1372 | xprt->servername = kstrdup(args->servername, GFP_KERNEL); | |
1373 | if (xprt->servername == NULL) { | |
1374 | xprt_destroy(xprt); | |
1375 | return ERR_PTR(-ENOMEM); | |
1376 | } | |
1377 | ||
3f940098 | 1378 | rpc_xprt_debugfs_register(xprt); |
388f0c77 | 1379 | |
46121cf7 | 1380 | dprintk("RPC: created transport %p with %u slots\n", xprt, |
c2866763 | 1381 | xprt->max_reqs); |
21de0a95 | 1382 | out: |
c2866763 CL |
1383 | return xprt; |
1384 | } | |
1385 | ||
9903cd1c CL |
1386 | /** |
1387 | * xprt_destroy - destroy an RPC transport, killing off all requests. | |
a8de240a | 1388 | * @xprt: transport to destroy |
9903cd1c | 1389 | * |
1da177e4 | 1390 | */ |
a8de240a | 1391 | static void xprt_destroy(struct rpc_xprt *xprt) |
1da177e4 | 1392 | { |
46121cf7 | 1393 | dprintk("RPC: destroying transport %p\n", xprt); |
0065db32 | 1394 | del_timer_sync(&xprt->timer); |
c8541ecd | 1395 | |
388f0c77 | 1396 | rpc_xprt_debugfs_unregister(xprt); |
f6a1cc89 TM |
1397 | rpc_destroy_wait_queue(&xprt->binding); |
1398 | rpc_destroy_wait_queue(&xprt->pending); | |
1399 | rpc_destroy_wait_queue(&xprt->sending); | |
f6a1cc89 | 1400 | rpc_destroy_wait_queue(&xprt->backlog); |
c3ae62ae | 1401 | cancel_work_sync(&xprt->task_cleanup); |
4e0038b6 | 1402 | kfree(xprt->servername); |
c8541ecd CL |
1403 | /* |
1404 | * Tear down transport state and free the rpc_xprt | |
1405 | */ | |
a246b010 | 1406 | xprt->ops->destroy(xprt); |
6b6ca86b | 1407 | } |
1da177e4 | 1408 | |
6b6ca86b TM |
1409 | /** |
1410 | * xprt_put - release a reference to an RPC transport. | |
1411 | * @xprt: pointer to the transport | |
1412 | * | |
1413 | */ | |
1414 | void xprt_put(struct rpc_xprt *xprt) | |
1415 | { | |
a8de240a TM |
1416 | if (atomic_dec_and_test(&xprt->count)) |
1417 | xprt_destroy(xprt); | |
6b6ca86b | 1418 | } |