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 | |
15 | * transport's wait list. At the same time, it installs a timer that | |
1da177e4 LT |
16 | * is run after the packet's timeout has expired. |
17 | * - When a packet arrives, the data_ready handler walks the list of | |
55aa4f58 | 18 | * pending requests for that transport. If a matching XID is found, the |
1da177e4 LT |
19 | * caller is woken up, and the timer removed. |
20 | * - When no reply arrives within the timeout interval, the timer is | |
21 | * fired by the kernel and runs xprt_timer(). It either adjusts the | |
22 | * timeout values (minor timeout) or wakes up the caller with a status | |
23 | * of -ETIMEDOUT. | |
24 | * - When the caller receives a notification from RPC that a reply arrived, | |
25 | * it should release the RPC slot, and process the reply. | |
26 | * If the call timed out, it may choose to retry the operation by | |
27 | * adjusting the initial timeout value, and simply calling rpc_call | |
28 | * again. | |
29 | * | |
30 | * Support for async RPC is done through a set of RPC-specific scheduling | |
31 | * primitives that `transparently' work for processes as well as async | |
32 | * tasks that rely on callbacks. | |
33 | * | |
34 | * Copyright (C) 1995-1997, Olaf Kirch <okir@monad.swb.de> | |
55aa4f58 CL |
35 | * |
36 | * Transport switch API copyright (C) 2005, Chuck Lever <cel@netapp.com> | |
1da177e4 LT |
37 | */ |
38 | ||
a246b010 CL |
39 | #include <linux/module.h> |
40 | ||
1da177e4 | 41 | #include <linux/types.h> |
a246b010 | 42 | #include <linux/interrupt.h> |
1da177e4 | 43 | #include <linux/workqueue.h> |
bf3fcf89 | 44 | #include <linux/net.h> |
1da177e4 | 45 | |
a246b010 | 46 | #include <linux/sunrpc/clnt.h> |
11c556b3 | 47 | #include <linux/sunrpc/metrics.h> |
1da177e4 LT |
48 | |
49 | /* | |
50 | * Local variables | |
51 | */ | |
52 | ||
53 | #ifdef RPC_DEBUG | |
1da177e4 LT |
54 | # define RPCDBG_FACILITY RPCDBG_XPRT |
55 | #endif | |
56 | ||
1da177e4 LT |
57 | /* |
58 | * Local functions | |
59 | */ | |
60 | static void xprt_request_init(struct rpc_task *, struct rpc_xprt *); | |
61 | static inline void do_xprt_reserve(struct rpc_task *); | |
1da177e4 | 62 | static void xprt_connect_status(struct rpc_task *task); |
1da177e4 LT |
63 | static int __xprt_get_cong(struct rpc_xprt *, struct rpc_task *); |
64 | ||
5ba03e82 | 65 | static DEFINE_SPINLOCK(xprt_list_lock); |
81c098af TT |
66 | static LIST_HEAD(xprt_list); |
67 | ||
555ee3af CL |
68 | /* |
69 | * The transport code maintains an estimate on the maximum number of out- | |
70 | * standing RPC requests, using a smoothed version of the congestion | |
71 | * avoidance implemented in 44BSD. This is basically the Van Jacobson | |
72 | * congestion algorithm: If a retransmit occurs, the congestion window is | |
73 | * halved; otherwise, it is incremented by 1/cwnd when | |
74 | * | |
75 | * - a reply is received and | |
76 | * - a full number of requests are outstanding and | |
77 | * - the congestion window hasn't been updated recently. | |
78 | */ | |
79 | #define RPC_CWNDSHIFT (8U) | |
80 | #define RPC_CWNDSCALE (1U << RPC_CWNDSHIFT) | |
81 | #define RPC_INITCWND RPC_CWNDSCALE | |
82 | #define RPC_MAXCWND(xprt) ((xprt)->max_reqs << RPC_CWNDSHIFT) | |
83 | ||
84 | #define RPCXPRT_CONGESTED(xprt) ((xprt)->cong >= (xprt)->cwnd) | |
1da177e4 | 85 | |
81c098af TT |
86 | /** |
87 | * xprt_register_transport - register a transport implementation | |
88 | * @transport: transport to register | |
89 | * | |
90 | * If a transport implementation is loaded as a kernel module, it can | |
91 | * call this interface to make itself known to the RPC client. | |
92 | * | |
93 | * Returns: | |
94 | * 0: transport successfully registered | |
95 | * -EEXIST: transport already registered | |
96 | * -EINVAL: transport module being unloaded | |
97 | */ | |
98 | int xprt_register_transport(struct xprt_class *transport) | |
99 | { | |
100 | struct xprt_class *t; | |
101 | int result; | |
102 | ||
103 | result = -EEXIST; | |
104 | spin_lock(&xprt_list_lock); | |
105 | list_for_each_entry(t, &xprt_list, list) { | |
106 | /* don't register the same transport class twice */ | |
4fa016eb | 107 | if (t->ident == transport->ident) |
81c098af TT |
108 | goto out; |
109 | } | |
110 | ||
c9f6cde6 DL |
111 | list_add_tail(&transport->list, &xprt_list); |
112 | printk(KERN_INFO "RPC: Registered %s transport module.\n", | |
113 | transport->name); | |
114 | result = 0; | |
81c098af TT |
115 | |
116 | out: | |
117 | spin_unlock(&xprt_list_lock); | |
118 | return result; | |
119 | } | |
120 | EXPORT_SYMBOL_GPL(xprt_register_transport); | |
121 | ||
122 | /** | |
123 | * xprt_unregister_transport - unregister a transport implementation | |
65b6e42c | 124 | * @transport: transport to unregister |
81c098af TT |
125 | * |
126 | * Returns: | |
127 | * 0: transport successfully unregistered | |
128 | * -ENOENT: transport never registered | |
129 | */ | |
130 | int xprt_unregister_transport(struct xprt_class *transport) | |
131 | { | |
132 | struct xprt_class *t; | |
133 | int result; | |
134 | ||
135 | result = 0; | |
136 | spin_lock(&xprt_list_lock); | |
137 | list_for_each_entry(t, &xprt_list, list) { | |
138 | if (t == transport) { | |
139 | printk(KERN_INFO | |
140 | "RPC: Unregistered %s transport module.\n", | |
141 | transport->name); | |
142 | list_del_init(&transport->list); | |
81c098af TT |
143 | goto out; |
144 | } | |
145 | } | |
146 | result = -ENOENT; | |
147 | ||
148 | out: | |
149 | spin_unlock(&xprt_list_lock); | |
150 | return result; | |
151 | } | |
152 | EXPORT_SYMBOL_GPL(xprt_unregister_transport); | |
153 | ||
12a80469 CL |
154 | /** |
155 | * xprt_reserve_xprt - serialize write access to transports | |
156 | * @task: task that is requesting access to the transport | |
157 | * | |
158 | * This prevents mixing the payload of separate requests, and prevents | |
159 | * transport connects from colliding with writes. No congestion control | |
160 | * is provided. | |
161 | */ | |
162 | int xprt_reserve_xprt(struct rpc_task *task) | |
163 | { | |
164 | struct rpc_xprt *xprt = task->tk_xprt; | |
165 | struct rpc_rqst *req = task->tk_rqstp; | |
166 | ||
167 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { | |
168 | if (task == xprt->snd_task) | |
169 | return 1; | |
170 | if (task == NULL) | |
171 | return 0; | |
172 | goto out_sleep; | |
173 | } | |
174 | xprt->snd_task = task; | |
175 | if (req) { | |
176 | req->rq_bytes_sent = 0; | |
177 | req->rq_ntrans++; | |
178 | } | |
179 | return 1; | |
180 | ||
181 | out_sleep: | |
46121cf7 | 182 | dprintk("RPC: %5u failed to lock transport %p\n", |
12a80469 CL |
183 | task->tk_pid, xprt); |
184 | task->tk_timeout = 0; | |
185 | task->tk_status = -EAGAIN; | |
186 | if (req && req->rq_ntrans) | |
5d00837b | 187 | rpc_sleep_on(&xprt->resend, task, NULL); |
12a80469 | 188 | else |
5d00837b | 189 | rpc_sleep_on(&xprt->sending, task, NULL); |
12a80469 CL |
190 | return 0; |
191 | } | |
12444809 | 192 | EXPORT_SYMBOL_GPL(xprt_reserve_xprt); |
12a80469 | 193 | |
632e3bdc TM |
194 | static void xprt_clear_locked(struct rpc_xprt *xprt) |
195 | { | |
196 | xprt->snd_task = NULL; | |
197 | if (!test_bit(XPRT_CLOSE_WAIT, &xprt->state) || xprt->shutdown) { | |
198 | smp_mb__before_clear_bit(); | |
199 | clear_bit(XPRT_LOCKED, &xprt->state); | |
200 | smp_mb__after_clear_bit(); | |
201 | } else | |
c1384c9c | 202 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
632e3bdc TM |
203 | } |
204 | ||
1da177e4 | 205 | /* |
12a80469 CL |
206 | * xprt_reserve_xprt_cong - serialize write access to transports |
207 | * @task: task that is requesting access to the transport | |
208 | * | |
209 | * Same as xprt_reserve_xprt, but Van Jacobson congestion control is | |
210 | * integrated into the decision of whether a request is allowed to be | |
211 | * woken up and given access to the transport. | |
1da177e4 | 212 | */ |
12a80469 | 213 | int xprt_reserve_xprt_cong(struct rpc_task *task) |
1da177e4 | 214 | { |
12a80469 | 215 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 LT |
216 | struct rpc_rqst *req = task->tk_rqstp; |
217 | ||
2226feb6 | 218 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { |
1da177e4 LT |
219 | if (task == xprt->snd_task) |
220 | return 1; | |
1da177e4 LT |
221 | goto out_sleep; |
222 | } | |
12a80469 | 223 | if (__xprt_get_cong(xprt, task)) { |
1da177e4 LT |
224 | xprt->snd_task = task; |
225 | if (req) { | |
226 | req->rq_bytes_sent = 0; | |
227 | req->rq_ntrans++; | |
228 | } | |
229 | return 1; | |
230 | } | |
632e3bdc | 231 | xprt_clear_locked(xprt); |
1da177e4 | 232 | out_sleep: |
46121cf7 | 233 | dprintk("RPC: %5u failed to lock transport %p\n", task->tk_pid, xprt); |
1da177e4 LT |
234 | task->tk_timeout = 0; |
235 | task->tk_status = -EAGAIN; | |
236 | if (req && req->rq_ntrans) | |
5d00837b | 237 | rpc_sleep_on(&xprt->resend, task, NULL); |
1da177e4 | 238 | else |
5d00837b | 239 | rpc_sleep_on(&xprt->sending, task, NULL); |
1da177e4 LT |
240 | return 0; |
241 | } | |
12444809 | 242 | EXPORT_SYMBOL_GPL(xprt_reserve_xprt_cong); |
1da177e4 | 243 | |
12a80469 | 244 | static inline int xprt_lock_write(struct rpc_xprt *xprt, struct rpc_task *task) |
1da177e4 LT |
245 | { |
246 | int retval; | |
247 | ||
4a0f8c04 | 248 | spin_lock_bh(&xprt->transport_lock); |
12a80469 | 249 | retval = xprt->ops->reserve_xprt(task); |
4a0f8c04 | 250 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 LT |
251 | return retval; |
252 | } | |
253 | ||
12a80469 | 254 | static void __xprt_lock_write_next(struct rpc_xprt *xprt) |
49e9a890 CL |
255 | { |
256 | struct rpc_task *task; | |
257 | struct rpc_rqst *req; | |
258 | ||
259 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) | |
260 | return; | |
261 | ||
262 | task = rpc_wake_up_next(&xprt->resend); | |
263 | if (!task) { | |
264 | task = rpc_wake_up_next(&xprt->sending); | |
265 | if (!task) | |
266 | goto out_unlock; | |
267 | } | |
268 | ||
269 | req = task->tk_rqstp; | |
270 | xprt->snd_task = task; | |
271 | if (req) { | |
272 | req->rq_bytes_sent = 0; | |
273 | req->rq_ntrans++; | |
274 | } | |
275 | return; | |
276 | ||
277 | out_unlock: | |
632e3bdc | 278 | xprt_clear_locked(xprt); |
49e9a890 CL |
279 | } |
280 | ||
281 | static void __xprt_lock_write_next_cong(struct rpc_xprt *xprt) | |
1da177e4 LT |
282 | { |
283 | struct rpc_task *task; | |
284 | ||
2226feb6 | 285 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) |
1da177e4 | 286 | return; |
49e9a890 | 287 | if (RPCXPRT_CONGESTED(xprt)) |
1da177e4 LT |
288 | goto out_unlock; |
289 | task = rpc_wake_up_next(&xprt->resend); | |
290 | if (!task) { | |
291 | task = rpc_wake_up_next(&xprt->sending); | |
292 | if (!task) | |
293 | goto out_unlock; | |
294 | } | |
49e9a890 | 295 | if (__xprt_get_cong(xprt, task)) { |
1da177e4 LT |
296 | struct rpc_rqst *req = task->tk_rqstp; |
297 | xprt->snd_task = task; | |
298 | if (req) { | |
299 | req->rq_bytes_sent = 0; | |
300 | req->rq_ntrans++; | |
301 | } | |
302 | return; | |
303 | } | |
304 | out_unlock: | |
632e3bdc | 305 | xprt_clear_locked(xprt); |
1da177e4 LT |
306 | } |
307 | ||
49e9a890 CL |
308 | /** |
309 | * xprt_release_xprt - allow other requests to use a transport | |
310 | * @xprt: transport with other tasks potentially waiting | |
311 | * @task: task that is releasing access to the transport | |
312 | * | |
313 | * Note that "task" can be NULL. No congestion control is provided. | |
1da177e4 | 314 | */ |
49e9a890 | 315 | void xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) |
1da177e4 LT |
316 | { |
317 | if (xprt->snd_task == task) { | |
632e3bdc | 318 | xprt_clear_locked(xprt); |
1da177e4 LT |
319 | __xprt_lock_write_next(xprt); |
320 | } | |
321 | } | |
12444809 | 322 | EXPORT_SYMBOL_GPL(xprt_release_xprt); |
1da177e4 | 323 | |
49e9a890 CL |
324 | /** |
325 | * xprt_release_xprt_cong - allow other requests to use a transport | |
326 | * @xprt: transport with other tasks potentially waiting | |
327 | * @task: task that is releasing access to the transport | |
328 | * | |
329 | * Note that "task" can be NULL. Another task is awoken to use the | |
330 | * transport if the transport's congestion window allows it. | |
331 | */ | |
332 | void xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task) | |
333 | { | |
334 | if (xprt->snd_task == task) { | |
632e3bdc | 335 | xprt_clear_locked(xprt); |
49e9a890 CL |
336 | __xprt_lock_write_next_cong(xprt); |
337 | } | |
338 | } | |
12444809 | 339 | EXPORT_SYMBOL_GPL(xprt_release_xprt_cong); |
49e9a890 CL |
340 | |
341 | static inline void xprt_release_write(struct rpc_xprt *xprt, struct rpc_task *task) | |
1da177e4 | 342 | { |
4a0f8c04 | 343 | spin_lock_bh(&xprt->transport_lock); |
49e9a890 | 344 | xprt->ops->release_xprt(xprt, task); |
4a0f8c04 | 345 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 LT |
346 | } |
347 | ||
1da177e4 LT |
348 | /* |
349 | * Van Jacobson congestion avoidance. Check if the congestion window | |
350 | * overflowed. Put the task to sleep if this is the case. | |
351 | */ | |
352 | static int | |
353 | __xprt_get_cong(struct rpc_xprt *xprt, struct rpc_task *task) | |
354 | { | |
355 | struct rpc_rqst *req = task->tk_rqstp; | |
356 | ||
357 | if (req->rq_cong) | |
358 | return 1; | |
46121cf7 | 359 | dprintk("RPC: %5u xprt_cwnd_limited cong = %lu cwnd = %lu\n", |
1da177e4 LT |
360 | task->tk_pid, xprt->cong, xprt->cwnd); |
361 | if (RPCXPRT_CONGESTED(xprt)) | |
362 | return 0; | |
363 | req->rq_cong = 1; | |
364 | xprt->cong += RPC_CWNDSCALE; | |
365 | return 1; | |
366 | } | |
367 | ||
368 | /* | |
369 | * Adjust the congestion window, and wake up the next task | |
370 | * that has been sleeping due to congestion | |
371 | */ | |
372 | static void | |
373 | __xprt_put_cong(struct rpc_xprt *xprt, struct rpc_rqst *req) | |
374 | { | |
375 | if (!req->rq_cong) | |
376 | return; | |
377 | req->rq_cong = 0; | |
378 | xprt->cong -= RPC_CWNDSCALE; | |
49e9a890 | 379 | __xprt_lock_write_next_cong(xprt); |
1da177e4 LT |
380 | } |
381 | ||
a58dd398 CL |
382 | /** |
383 | * xprt_release_rqst_cong - housekeeping when request is complete | |
384 | * @task: RPC request that recently completed | |
385 | * | |
386 | * Useful for transports that require congestion control. | |
387 | */ | |
388 | void xprt_release_rqst_cong(struct rpc_task *task) | |
389 | { | |
390 | __xprt_put_cong(task->tk_xprt, task->tk_rqstp); | |
391 | } | |
12444809 | 392 | EXPORT_SYMBOL_GPL(xprt_release_rqst_cong); |
a58dd398 | 393 | |
46c0ee8b CL |
394 | /** |
395 | * xprt_adjust_cwnd - adjust transport congestion window | |
396 | * @task: recently completed RPC request used to adjust window | |
397 | * @result: result code of completed RPC request | |
398 | * | |
1da177e4 LT |
399 | * We use a time-smoothed congestion estimator to avoid heavy oscillation. |
400 | */ | |
46c0ee8b | 401 | void xprt_adjust_cwnd(struct rpc_task *task, int result) |
1da177e4 | 402 | { |
46c0ee8b CL |
403 | struct rpc_rqst *req = task->tk_rqstp; |
404 | struct rpc_xprt *xprt = task->tk_xprt; | |
405 | unsigned long cwnd = xprt->cwnd; | |
1da177e4 | 406 | |
1da177e4 LT |
407 | if (result >= 0 && cwnd <= xprt->cong) { |
408 | /* The (cwnd >> 1) term makes sure | |
409 | * the result gets rounded properly. */ | |
410 | cwnd += (RPC_CWNDSCALE * RPC_CWNDSCALE + (cwnd >> 1)) / cwnd; | |
411 | if (cwnd > RPC_MAXCWND(xprt)) | |
412 | cwnd = RPC_MAXCWND(xprt); | |
49e9a890 | 413 | __xprt_lock_write_next_cong(xprt); |
1da177e4 LT |
414 | } else if (result == -ETIMEDOUT) { |
415 | cwnd >>= 1; | |
416 | if (cwnd < RPC_CWNDSCALE) | |
417 | cwnd = RPC_CWNDSCALE; | |
418 | } | |
46121cf7 | 419 | dprintk("RPC: cong %ld, cwnd was %ld, now %ld\n", |
1da177e4 LT |
420 | xprt->cong, xprt->cwnd, cwnd); |
421 | xprt->cwnd = cwnd; | |
46c0ee8b | 422 | __xprt_put_cong(xprt, req); |
1da177e4 | 423 | } |
12444809 | 424 | EXPORT_SYMBOL_GPL(xprt_adjust_cwnd); |
1da177e4 | 425 | |
44fbac22 CL |
426 | /** |
427 | * xprt_wake_pending_tasks - wake all tasks on a transport's pending queue | |
428 | * @xprt: transport with waiting tasks | |
429 | * @status: result code to plant in each task before waking it | |
430 | * | |
431 | */ | |
432 | void xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status) | |
433 | { | |
434 | if (status < 0) | |
435 | rpc_wake_up_status(&xprt->pending, status); | |
436 | else | |
437 | rpc_wake_up(&xprt->pending); | |
438 | } | |
12444809 | 439 | EXPORT_SYMBOL_GPL(xprt_wake_pending_tasks); |
44fbac22 | 440 | |
c7b2cae8 CL |
441 | /** |
442 | * xprt_wait_for_buffer_space - wait for transport output buffer to clear | |
443 | * @task: task to be put to sleep | |
0b80ae42 | 444 | * @action: function pointer to be executed after wait |
c7b2cae8 | 445 | */ |
b6ddf64f | 446 | void xprt_wait_for_buffer_space(struct rpc_task *task, rpc_action action) |
c7b2cae8 CL |
447 | { |
448 | struct rpc_rqst *req = task->tk_rqstp; | |
449 | struct rpc_xprt *xprt = req->rq_xprt; | |
450 | ||
451 | task->tk_timeout = req->rq_timeout; | |
b6ddf64f | 452 | rpc_sleep_on(&xprt->pending, task, action); |
c7b2cae8 | 453 | } |
12444809 | 454 | EXPORT_SYMBOL_GPL(xprt_wait_for_buffer_space); |
c7b2cae8 CL |
455 | |
456 | /** | |
457 | * xprt_write_space - wake the task waiting for transport output buffer space | |
458 | * @xprt: transport with waiting tasks | |
459 | * | |
460 | * Can be called in a soft IRQ context, so xprt_write_space never sleeps. | |
461 | */ | |
462 | void xprt_write_space(struct rpc_xprt *xprt) | |
463 | { | |
464 | if (unlikely(xprt->shutdown)) | |
465 | return; | |
466 | ||
467 | spin_lock_bh(&xprt->transport_lock); | |
468 | if (xprt->snd_task) { | |
46121cf7 CL |
469 | dprintk("RPC: write space: waking waiting task on " |
470 | "xprt %p\n", xprt); | |
fda13939 | 471 | rpc_wake_up_queued_task(&xprt->pending, xprt->snd_task); |
c7b2cae8 CL |
472 | } |
473 | spin_unlock_bh(&xprt->transport_lock); | |
474 | } | |
12444809 | 475 | EXPORT_SYMBOL_GPL(xprt_write_space); |
c7b2cae8 | 476 | |
fe3aca29 CL |
477 | /** |
478 | * xprt_set_retrans_timeout_def - set a request's retransmit timeout | |
479 | * @task: task whose timeout is to be set | |
480 | * | |
481 | * Set a request's retransmit timeout based on the transport's | |
482 | * default timeout parameters. Used by transports that don't adjust | |
483 | * the retransmit timeout based on round-trip time estimation. | |
484 | */ | |
485 | void xprt_set_retrans_timeout_def(struct rpc_task *task) | |
486 | { | |
487 | task->tk_timeout = task->tk_rqstp->rq_timeout; | |
488 | } | |
12444809 | 489 | EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_def); |
fe3aca29 CL |
490 | |
491 | /* | |
492 | * xprt_set_retrans_timeout_rtt - set a request's retransmit timeout | |
493 | * @task: task whose timeout is to be set | |
cca5172a | 494 | * |
fe3aca29 CL |
495 | * Set a request's retransmit timeout using the RTT estimator. |
496 | */ | |
497 | void xprt_set_retrans_timeout_rtt(struct rpc_task *task) | |
498 | { | |
499 | int timer = task->tk_msg.rpc_proc->p_timer; | |
ba7392bb TM |
500 | struct rpc_clnt *clnt = task->tk_client; |
501 | struct rpc_rtt *rtt = clnt->cl_rtt; | |
fe3aca29 | 502 | struct rpc_rqst *req = task->tk_rqstp; |
ba7392bb | 503 | unsigned long max_timeout = clnt->cl_timeout->to_maxval; |
fe3aca29 CL |
504 | |
505 | task->tk_timeout = rpc_calc_rto(rtt, timer); | |
506 | task->tk_timeout <<= rpc_ntimeo(rtt, timer) + req->rq_retries; | |
507 | if (task->tk_timeout > max_timeout || task->tk_timeout == 0) | |
508 | task->tk_timeout = max_timeout; | |
509 | } | |
12444809 | 510 | EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_rtt); |
fe3aca29 | 511 | |
1da177e4 LT |
512 | static void xprt_reset_majortimeo(struct rpc_rqst *req) |
513 | { | |
ba7392bb | 514 | const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout; |
1da177e4 LT |
515 | |
516 | req->rq_majortimeo = req->rq_timeout; | |
517 | if (to->to_exponential) | |
518 | req->rq_majortimeo <<= to->to_retries; | |
519 | else | |
520 | req->rq_majortimeo += to->to_increment * to->to_retries; | |
521 | if (req->rq_majortimeo > to->to_maxval || req->rq_majortimeo == 0) | |
522 | req->rq_majortimeo = to->to_maxval; | |
523 | req->rq_majortimeo += jiffies; | |
524 | } | |
525 | ||
9903cd1c CL |
526 | /** |
527 | * xprt_adjust_timeout - adjust timeout values for next retransmit | |
528 | * @req: RPC request containing parameters to use for the adjustment | |
529 | * | |
1da177e4 LT |
530 | */ |
531 | int xprt_adjust_timeout(struct rpc_rqst *req) | |
532 | { | |
533 | struct rpc_xprt *xprt = req->rq_xprt; | |
ba7392bb | 534 | const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout; |
1da177e4 LT |
535 | int status = 0; |
536 | ||
537 | if (time_before(jiffies, req->rq_majortimeo)) { | |
538 | if (to->to_exponential) | |
539 | req->rq_timeout <<= 1; | |
540 | else | |
541 | req->rq_timeout += to->to_increment; | |
542 | if (to->to_maxval && req->rq_timeout >= to->to_maxval) | |
543 | req->rq_timeout = to->to_maxval; | |
544 | req->rq_retries++; | |
1da177e4 LT |
545 | } else { |
546 | req->rq_timeout = to->to_initval; | |
547 | req->rq_retries = 0; | |
548 | xprt_reset_majortimeo(req); | |
549 | /* Reset the RTT counters == "slow start" */ | |
4a0f8c04 | 550 | spin_lock_bh(&xprt->transport_lock); |
1da177e4 | 551 | rpc_init_rtt(req->rq_task->tk_client->cl_rtt, to->to_initval); |
4a0f8c04 | 552 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 LT |
553 | status = -ETIMEDOUT; |
554 | } | |
555 | ||
556 | if (req->rq_timeout == 0) { | |
557 | printk(KERN_WARNING "xprt_adjust_timeout: rq_timeout = 0!\n"); | |
558 | req->rq_timeout = 5 * HZ; | |
559 | } | |
560 | return status; | |
561 | } | |
562 | ||
65f27f38 | 563 | static void xprt_autoclose(struct work_struct *work) |
1da177e4 | 564 | { |
65f27f38 DH |
565 | struct rpc_xprt *xprt = |
566 | container_of(work, struct rpc_xprt, task_cleanup); | |
1da177e4 | 567 | |
a246b010 | 568 | xprt->ops->close(xprt); |
66af1e55 | 569 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
1da177e4 LT |
570 | xprt_release_write(xprt, NULL); |
571 | } | |
572 | ||
9903cd1c | 573 | /** |
62da3b24 | 574 | * xprt_disconnect_done - mark a transport as disconnected |
9903cd1c CL |
575 | * @xprt: transport to flag for disconnect |
576 | * | |
1da177e4 | 577 | */ |
62da3b24 | 578 | void xprt_disconnect_done(struct rpc_xprt *xprt) |
1da177e4 | 579 | { |
46121cf7 | 580 | dprintk("RPC: disconnected transport %p\n", xprt); |
4a0f8c04 | 581 | spin_lock_bh(&xprt->transport_lock); |
1da177e4 | 582 | xprt_clear_connected(xprt); |
44fbac22 | 583 | xprt_wake_pending_tasks(xprt, -ENOTCONN); |
4a0f8c04 | 584 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 | 585 | } |
62da3b24 | 586 | EXPORT_SYMBOL_GPL(xprt_disconnect_done); |
1da177e4 | 587 | |
66af1e55 TM |
588 | /** |
589 | * xprt_force_disconnect - force a transport to disconnect | |
590 | * @xprt: transport to disconnect | |
591 | * | |
592 | */ | |
593 | void xprt_force_disconnect(struct rpc_xprt *xprt) | |
594 | { | |
595 | /* Don't race with the test_bit() in xprt_clear_locked() */ | |
596 | spin_lock_bh(&xprt->transport_lock); | |
597 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
598 | /* Try to schedule an autoclose RPC call */ | |
599 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) | |
600 | queue_work(rpciod_workqueue, &xprt->task_cleanup); | |
fda13939 | 601 | xprt_wake_pending_tasks(xprt, -ENOTCONN); |
66af1e55 TM |
602 | spin_unlock_bh(&xprt->transport_lock); |
603 | } | |
66af1e55 | 604 | |
7c1d71cf TM |
605 | /** |
606 | * xprt_conditional_disconnect - force a transport to disconnect | |
607 | * @xprt: transport to disconnect | |
608 | * @cookie: 'connection cookie' | |
609 | * | |
610 | * This attempts to break the connection if and only if 'cookie' matches | |
611 | * the current transport 'connection cookie'. It ensures that we don't | |
612 | * try to break the connection more than once when we need to retransmit | |
613 | * a batch of RPC requests. | |
614 | * | |
615 | */ | |
616 | void xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie) | |
617 | { | |
618 | /* Don't race with the test_bit() in xprt_clear_locked() */ | |
619 | spin_lock_bh(&xprt->transport_lock); | |
620 | if (cookie != xprt->connect_cookie) | |
621 | goto out; | |
622 | if (test_bit(XPRT_CLOSING, &xprt->state) || !xprt_connected(xprt)) | |
623 | goto out; | |
624 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
625 | /* Try to schedule an autoclose RPC call */ | |
626 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) | |
627 | queue_work(rpciod_workqueue, &xprt->task_cleanup); | |
628 | xprt_wake_pending_tasks(xprt, -ENOTCONN); | |
629 | out: | |
630 | spin_unlock_bh(&xprt->transport_lock); | |
631 | } | |
632 | ||
1da177e4 LT |
633 | static void |
634 | xprt_init_autodisconnect(unsigned long data) | |
635 | { | |
636 | struct rpc_xprt *xprt = (struct rpc_xprt *)data; | |
637 | ||
4a0f8c04 | 638 | spin_lock(&xprt->transport_lock); |
1da177e4 LT |
639 | if (!list_empty(&xprt->recv) || xprt->shutdown) |
640 | goto out_abort; | |
2226feb6 | 641 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) |
1da177e4 | 642 | goto out_abort; |
4a0f8c04 | 643 | spin_unlock(&xprt->transport_lock); |
2226feb6 | 644 | if (xprt_connecting(xprt)) |
1da177e4 LT |
645 | xprt_release_write(xprt, NULL); |
646 | else | |
c1384c9c | 647 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
1da177e4 LT |
648 | return; |
649 | out_abort: | |
4a0f8c04 | 650 | spin_unlock(&xprt->transport_lock); |
1da177e4 LT |
651 | } |
652 | ||
9903cd1c CL |
653 | /** |
654 | * xprt_connect - schedule a transport connect operation | |
655 | * @task: RPC task that is requesting the connect | |
1da177e4 LT |
656 | * |
657 | */ | |
658 | void xprt_connect(struct rpc_task *task) | |
659 | { | |
660 | struct rpc_xprt *xprt = task->tk_xprt; | |
661 | ||
46121cf7 | 662 | dprintk("RPC: %5u xprt_connect xprt %p %s connected\n", task->tk_pid, |
1da177e4 LT |
663 | xprt, (xprt_connected(xprt) ? "is" : "is not")); |
664 | ||
ec739ef0 | 665 | if (!xprt_bound(xprt)) { |
1da177e4 LT |
666 | task->tk_status = -EIO; |
667 | return; | |
668 | } | |
669 | if (!xprt_lock_write(xprt, task)) | |
670 | return; | |
671 | if (xprt_connected(xprt)) | |
a246b010 CL |
672 | xprt_release_write(xprt, task); |
673 | else { | |
674 | if (task->tk_rqstp) | |
675 | task->tk_rqstp->rq_bytes_sent = 0; | |
1da177e4 | 676 | |
03bf4b70 | 677 | task->tk_timeout = xprt->connect_timeout; |
5d00837b | 678 | rpc_sleep_on(&xprt->pending, task, xprt_connect_status); |
262ca07d | 679 | xprt->stat.connect_start = jiffies; |
a246b010 | 680 | xprt->ops->connect(task); |
1da177e4 LT |
681 | } |
682 | return; | |
1da177e4 LT |
683 | } |
684 | ||
9903cd1c | 685 | static void xprt_connect_status(struct rpc_task *task) |
1da177e4 LT |
686 | { |
687 | struct rpc_xprt *xprt = task->tk_xprt; | |
688 | ||
cd983ef8 | 689 | if (task->tk_status == 0) { |
262ca07d CL |
690 | xprt->stat.connect_count++; |
691 | xprt->stat.connect_time += (long)jiffies - xprt->stat.connect_start; | |
46121cf7 | 692 | dprintk("RPC: %5u xprt_connect_status: connection established\n", |
1da177e4 LT |
693 | task->tk_pid); |
694 | return; | |
695 | } | |
696 | ||
1da177e4 | 697 | switch (task->tk_status) { |
1da177e4 | 698 | case -ENOTCONN: |
46121cf7 | 699 | dprintk("RPC: %5u xprt_connect_status: connection broken\n", |
23475d66 CL |
700 | task->tk_pid); |
701 | break; | |
1da177e4 | 702 | case -ETIMEDOUT: |
46121cf7 CL |
703 | dprintk("RPC: %5u xprt_connect_status: connect attempt timed " |
704 | "out\n", task->tk_pid); | |
1da177e4 LT |
705 | break; |
706 | default: | |
46121cf7 CL |
707 | dprintk("RPC: %5u xprt_connect_status: error %d connecting to " |
708 | "server %s\n", task->tk_pid, -task->tk_status, | |
709 | task->tk_client->cl_server); | |
23475d66 CL |
710 | xprt_release_write(xprt, task); |
711 | task->tk_status = -EIO; | |
1da177e4 | 712 | } |
1da177e4 LT |
713 | } |
714 | ||
9903cd1c CL |
715 | /** |
716 | * xprt_lookup_rqst - find an RPC request corresponding to an XID | |
717 | * @xprt: transport on which the original request was transmitted | |
718 | * @xid: RPC XID of incoming reply | |
719 | * | |
1da177e4 | 720 | */ |
d8ed029d | 721 | struct rpc_rqst *xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid) |
1da177e4 LT |
722 | { |
723 | struct list_head *pos; | |
1da177e4 LT |
724 | |
725 | list_for_each(pos, &xprt->recv) { | |
726 | struct rpc_rqst *entry = list_entry(pos, struct rpc_rqst, rq_list); | |
262ca07d CL |
727 | if (entry->rq_xid == xid) |
728 | return entry; | |
1da177e4 | 729 | } |
46121cf7 CL |
730 | |
731 | dprintk("RPC: xprt_lookup_rqst did not find xid %08x\n", | |
732 | ntohl(xid)); | |
262ca07d CL |
733 | xprt->stat.bad_xids++; |
734 | return NULL; | |
1da177e4 | 735 | } |
12444809 | 736 | EXPORT_SYMBOL_GPL(xprt_lookup_rqst); |
1da177e4 | 737 | |
1570c1e4 CL |
738 | /** |
739 | * xprt_update_rtt - update an RPC client's RTT state after receiving a reply | |
740 | * @task: RPC request that recently completed | |
741 | * | |
742 | */ | |
743 | void xprt_update_rtt(struct rpc_task *task) | |
744 | { | |
745 | struct rpc_rqst *req = task->tk_rqstp; | |
746 | struct rpc_rtt *rtt = task->tk_client->cl_rtt; | |
747 | unsigned timer = task->tk_msg.rpc_proc->p_timer; | |
748 | ||
749 | if (timer) { | |
750 | if (req->rq_ntrans == 1) | |
751 | rpc_update_rtt(rtt, timer, | |
752 | (long)jiffies - req->rq_xtime); | |
753 | rpc_set_timeo(rtt, timer, req->rq_ntrans - 1); | |
754 | } | |
755 | } | |
12444809 | 756 | EXPORT_SYMBOL_GPL(xprt_update_rtt); |
1570c1e4 | 757 | |
9903cd1c CL |
758 | /** |
759 | * xprt_complete_rqst - called when reply processing is complete | |
1570c1e4 | 760 | * @task: RPC request that recently completed |
9903cd1c CL |
761 | * @copied: actual number of bytes received from the transport |
762 | * | |
1570c1e4 | 763 | * Caller holds transport lock. |
1da177e4 | 764 | */ |
1570c1e4 | 765 | void xprt_complete_rqst(struct rpc_task *task, int copied) |
1da177e4 | 766 | { |
1570c1e4 | 767 | struct rpc_rqst *req = task->tk_rqstp; |
fda13939 | 768 | struct rpc_xprt *xprt = req->rq_xprt; |
1da177e4 | 769 | |
1570c1e4 CL |
770 | dprintk("RPC: %5u xid %08x complete (%d bytes received)\n", |
771 | task->tk_pid, ntohl(req->rq_xid), copied); | |
1da177e4 | 772 | |
fda13939 | 773 | xprt->stat.recvs++; |
ef759a2e CL |
774 | task->tk_rtt = (long)jiffies - req->rq_xtime; |
775 | ||
1da177e4 | 776 | list_del_init(&req->rq_list); |
1e799b67 | 777 | req->rq_private_buf.len = copied; |
43ac3f29 TM |
778 | /* Ensure all writes are done before we update req->rq_received */ |
779 | smp_wmb(); | |
1e799b67 | 780 | req->rq_received = copied; |
fda13939 | 781 | rpc_wake_up_queued_task(&xprt->pending, task); |
1da177e4 | 782 | } |
12444809 | 783 | EXPORT_SYMBOL_GPL(xprt_complete_rqst); |
1da177e4 | 784 | |
46c0ee8b | 785 | static void xprt_timer(struct rpc_task *task) |
1da177e4 | 786 | { |
46c0ee8b | 787 | struct rpc_rqst *req = task->tk_rqstp; |
1da177e4 LT |
788 | struct rpc_xprt *xprt = req->rq_xprt; |
789 | ||
5d00837b TM |
790 | if (task->tk_status != -ETIMEDOUT) |
791 | return; | |
46121cf7 | 792 | dprintk("RPC: %5u xprt_timer\n", task->tk_pid); |
1da177e4 | 793 | |
5d00837b | 794 | spin_lock_bh(&xprt->transport_lock); |
46c0ee8b CL |
795 | if (!req->rq_received) { |
796 | if (xprt->ops->timer) | |
797 | xprt->ops->timer(task); | |
5d00837b TM |
798 | } else |
799 | task->tk_status = 0; | |
800 | spin_unlock_bh(&xprt->transport_lock); | |
1da177e4 LT |
801 | } |
802 | ||
9903cd1c CL |
803 | /** |
804 | * xprt_prepare_transmit - reserve the transport before sending a request | |
805 | * @task: RPC task about to send a request | |
806 | * | |
1da177e4 | 807 | */ |
9903cd1c | 808 | int xprt_prepare_transmit(struct rpc_task *task) |
1da177e4 LT |
809 | { |
810 | struct rpc_rqst *req = task->tk_rqstp; | |
811 | struct rpc_xprt *xprt = req->rq_xprt; | |
812 | int err = 0; | |
813 | ||
46121cf7 | 814 | dprintk("RPC: %5u xprt_prepare_transmit\n", task->tk_pid); |
1da177e4 | 815 | |
4a0f8c04 | 816 | spin_lock_bh(&xprt->transport_lock); |
1da177e4 LT |
817 | if (req->rq_received && !req->rq_bytes_sent) { |
818 | err = req->rq_received; | |
819 | goto out_unlock; | |
820 | } | |
12a80469 | 821 | if (!xprt->ops->reserve_xprt(task)) { |
1da177e4 LT |
822 | err = -EAGAIN; |
823 | goto out_unlock; | |
824 | } | |
825 | ||
826 | if (!xprt_connected(xprt)) { | |
827 | err = -ENOTCONN; | |
828 | goto out_unlock; | |
829 | } | |
830 | out_unlock: | |
4a0f8c04 | 831 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 LT |
832 | return err; |
833 | } | |
834 | ||
e0ab53de | 835 | void xprt_end_transmit(struct rpc_task *task) |
5e5ce5be | 836 | { |
e0ab53de | 837 | xprt_release_write(task->tk_xprt, task); |
5e5ce5be TM |
838 | } |
839 | ||
9903cd1c CL |
840 | /** |
841 | * xprt_transmit - send an RPC request on a transport | |
842 | * @task: controlling RPC task | |
843 | * | |
844 | * We have to copy the iovec because sendmsg fiddles with its contents. | |
845 | */ | |
846 | void xprt_transmit(struct rpc_task *task) | |
1da177e4 | 847 | { |
1da177e4 LT |
848 | struct rpc_rqst *req = task->tk_rqstp; |
849 | struct rpc_xprt *xprt = req->rq_xprt; | |
a246b010 | 850 | int status; |
1da177e4 | 851 | |
46121cf7 | 852 | dprintk("RPC: %5u xprt_transmit(%u)\n", task->tk_pid, req->rq_slen); |
1da177e4 | 853 | |
1da177e4 LT |
854 | if (!req->rq_received) { |
855 | if (list_empty(&req->rq_list)) { | |
4a0f8c04 | 856 | spin_lock_bh(&xprt->transport_lock); |
1da177e4 LT |
857 | /* Update the softirq receive buffer */ |
858 | memcpy(&req->rq_private_buf, &req->rq_rcv_buf, | |
859 | sizeof(req->rq_private_buf)); | |
860 | /* Add request to the receive list */ | |
861 | list_add_tail(&req->rq_list, &xprt->recv); | |
4a0f8c04 | 862 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 | 863 | xprt_reset_majortimeo(req); |
0f9dc2b1 TM |
864 | /* Turn off autodisconnect */ |
865 | del_singleshot_timer_sync(&xprt->timer); | |
1da177e4 LT |
866 | } |
867 | } else if (!req->rq_bytes_sent) | |
868 | return; | |
869 | ||
7c1d71cf | 870 | req->rq_connect_cookie = xprt->connect_cookie; |
b22602a6 | 871 | req->rq_xtime = jiffies; |
a246b010 | 872 | status = xprt->ops->send_request(task); |
fe3aca29 | 873 | if (status == 0) { |
46121cf7 | 874 | dprintk("RPC: %5u xmit complete\n", task->tk_pid); |
fe3aca29 | 875 | spin_lock_bh(&xprt->transport_lock); |
262ca07d | 876 | |
fe3aca29 | 877 | xprt->ops->set_retrans_timeout(task); |
262ca07d CL |
878 | |
879 | xprt->stat.sends++; | |
880 | xprt->stat.req_u += xprt->stat.sends - xprt->stat.recvs; | |
881 | xprt->stat.bklog_u += xprt->backlog.qlen; | |
882 | ||
fe3aca29 CL |
883 | /* Don't race with disconnect */ |
884 | if (!xprt_connected(xprt)) | |
885 | task->tk_status = -ENOTCONN; | |
886 | else if (!req->rq_received) | |
5d00837b | 887 | rpc_sleep_on(&xprt->pending, task, xprt_timer); |
fe3aca29 CL |
888 | spin_unlock_bh(&xprt->transport_lock); |
889 | return; | |
890 | } | |
1da177e4 LT |
891 | |
892 | /* Note: at this point, task->tk_sleeping has not yet been set, | |
893 | * hence there is no danger of the waking up task being put on | |
894 | * schedq, and being picked up by a parallel run of rpciod(). | |
895 | */ | |
896 | task->tk_status = status; | |
e0ab53de | 897 | if (status == -ECONNREFUSED) |
5d00837b | 898 | rpc_sleep_on(&xprt->sending, task, NULL); |
1da177e4 LT |
899 | } |
900 | ||
9903cd1c | 901 | static inline void do_xprt_reserve(struct rpc_task *task) |
1da177e4 LT |
902 | { |
903 | struct rpc_xprt *xprt = task->tk_xprt; | |
904 | ||
905 | task->tk_status = 0; | |
906 | if (task->tk_rqstp) | |
907 | return; | |
908 | if (!list_empty(&xprt->free)) { | |
909 | struct rpc_rqst *req = list_entry(xprt->free.next, struct rpc_rqst, rq_list); | |
910 | list_del_init(&req->rq_list); | |
911 | task->tk_rqstp = req; | |
912 | xprt_request_init(task, xprt); | |
913 | return; | |
914 | } | |
46121cf7 | 915 | dprintk("RPC: waiting for request slot\n"); |
1da177e4 LT |
916 | task->tk_status = -EAGAIN; |
917 | task->tk_timeout = 0; | |
5d00837b | 918 | rpc_sleep_on(&xprt->backlog, task, NULL); |
1da177e4 LT |
919 | } |
920 | ||
9903cd1c CL |
921 | /** |
922 | * xprt_reserve - allocate an RPC request slot | |
923 | * @task: RPC task requesting a slot allocation | |
924 | * | |
925 | * If no more slots are available, place the task on the transport's | |
926 | * backlog queue. | |
927 | */ | |
928 | void xprt_reserve(struct rpc_task *task) | |
1da177e4 LT |
929 | { |
930 | struct rpc_xprt *xprt = task->tk_xprt; | |
931 | ||
932 | task->tk_status = -EIO; | |
0065db32 TM |
933 | spin_lock(&xprt->reserve_lock); |
934 | do_xprt_reserve(task); | |
935 | spin_unlock(&xprt->reserve_lock); | |
1da177e4 LT |
936 | } |
937 | ||
d8ed029d | 938 | static inline __be32 xprt_alloc_xid(struct rpc_xprt *xprt) |
1da177e4 LT |
939 | { |
940 | return xprt->xid++; | |
941 | } | |
942 | ||
943 | static inline void xprt_init_xid(struct rpc_xprt *xprt) | |
944 | { | |
bf3fcf89 | 945 | xprt->xid = net_random(); |
1da177e4 LT |
946 | } |
947 | ||
9903cd1c | 948 | static void xprt_request_init(struct rpc_task *task, struct rpc_xprt *xprt) |
1da177e4 LT |
949 | { |
950 | struct rpc_rqst *req = task->tk_rqstp; | |
951 | ||
ba7392bb | 952 | req->rq_timeout = task->tk_client->cl_timeout->to_initval; |
1da177e4 LT |
953 | req->rq_task = task; |
954 | req->rq_xprt = xprt; | |
02107148 | 955 | req->rq_buffer = NULL; |
1da177e4 | 956 | req->rq_xid = xprt_alloc_xid(xprt); |
ead5e1c2 | 957 | req->rq_release_snd_buf = NULL; |
da45828e | 958 | xprt_reset_majortimeo(req); |
46121cf7 | 959 | dprintk("RPC: %5u reserved req %p xid %08x\n", task->tk_pid, |
1da177e4 LT |
960 | req, ntohl(req->rq_xid)); |
961 | } | |
962 | ||
9903cd1c CL |
963 | /** |
964 | * xprt_release - release an RPC request slot | |
965 | * @task: task which is finished with the slot | |
966 | * | |
1da177e4 | 967 | */ |
9903cd1c | 968 | void xprt_release(struct rpc_task *task) |
1da177e4 LT |
969 | { |
970 | struct rpc_xprt *xprt = task->tk_xprt; | |
971 | struct rpc_rqst *req; | |
972 | ||
973 | if (!(req = task->tk_rqstp)) | |
974 | return; | |
11c556b3 | 975 | rpc_count_iostats(task); |
4a0f8c04 | 976 | spin_lock_bh(&xprt->transport_lock); |
49e9a890 | 977 | xprt->ops->release_xprt(xprt, task); |
a58dd398 CL |
978 | if (xprt->ops->release_request) |
979 | xprt->ops->release_request(task); | |
1da177e4 LT |
980 | if (!list_empty(&req->rq_list)) |
981 | list_del(&req->rq_list); | |
982 | xprt->last_used = jiffies; | |
0065db32 | 983 | if (list_empty(&xprt->recv)) |
a246b010 | 984 | mod_timer(&xprt->timer, |
03bf4b70 | 985 | xprt->last_used + xprt->idle_timeout); |
4a0f8c04 | 986 | spin_unlock_bh(&xprt->transport_lock); |
c5a4dd8b | 987 | xprt->ops->buf_free(req->rq_buffer); |
1da177e4 | 988 | task->tk_rqstp = NULL; |
ead5e1c2 BF |
989 | if (req->rq_release_snd_buf) |
990 | req->rq_release_snd_buf(req); | |
1da177e4 LT |
991 | memset(req, 0, sizeof(*req)); /* mark unused */ |
992 | ||
46121cf7 | 993 | dprintk("RPC: %5u release request %p\n", task->tk_pid, req); |
1da177e4 | 994 | |
5dc07727 | 995 | spin_lock(&xprt->reserve_lock); |
1da177e4 | 996 | list_add(&req->rq_list, &xprt->free); |
555ee3af | 997 | rpc_wake_up_next(&xprt->backlog); |
5dc07727 | 998 | spin_unlock(&xprt->reserve_lock); |
1da177e4 LT |
999 | } |
1000 | ||
c2866763 CL |
1001 | /** |
1002 | * xprt_create_transport - create an RPC transport | |
96802a09 | 1003 | * @args: rpc transport creation arguments |
c2866763 CL |
1004 | * |
1005 | */ | |
3c341b0b | 1006 | struct rpc_xprt *xprt_create_transport(struct xprt_create *args) |
c2866763 | 1007 | { |
c2866763 CL |
1008 | struct rpc_xprt *xprt; |
1009 | struct rpc_rqst *req; | |
bc25571e | 1010 | struct xprt_class *t; |
c2866763 | 1011 | |
bc25571e TT |
1012 | spin_lock(&xprt_list_lock); |
1013 | list_for_each_entry(t, &xprt_list, list) { | |
4fa016eb | 1014 | if (t->ident == args->ident) { |
bc25571e TT |
1015 | spin_unlock(&xprt_list_lock); |
1016 | goto found; | |
1017 | } | |
c2866763 | 1018 | } |
bc25571e | 1019 | spin_unlock(&xprt_list_lock); |
4fa016eb | 1020 | printk(KERN_ERR "RPC: transport (%d) not supported\n", args->ident); |
bc25571e TT |
1021 | return ERR_PTR(-EIO); |
1022 | ||
1023 | found: | |
1024 | xprt = t->setup(args); | |
c8541ecd | 1025 | if (IS_ERR(xprt)) { |
46121cf7 | 1026 | dprintk("RPC: xprt_create_transport: failed, %ld\n", |
c8541ecd CL |
1027 | -PTR_ERR(xprt)); |
1028 | return xprt; | |
c2866763 CL |
1029 | } |
1030 | ||
6b6ca86b | 1031 | kref_init(&xprt->kref); |
c2866763 CL |
1032 | spin_lock_init(&xprt->transport_lock); |
1033 | spin_lock_init(&xprt->reserve_lock); | |
1034 | ||
1035 | INIT_LIST_HEAD(&xprt->free); | |
1036 | INIT_LIST_HEAD(&xprt->recv); | |
65f27f38 | 1037 | INIT_WORK(&xprt->task_cleanup, xprt_autoclose); |
b24b8a24 PE |
1038 | setup_timer(&xprt->timer, xprt_init_autodisconnect, |
1039 | (unsigned long)xprt); | |
c2866763 CL |
1040 | xprt->last_used = jiffies; |
1041 | xprt->cwnd = RPC_INITCWND; | |
a509050b | 1042 | xprt->bind_index = 0; |
c2866763 CL |
1043 | |
1044 | rpc_init_wait_queue(&xprt->binding, "xprt_binding"); | |
1045 | rpc_init_wait_queue(&xprt->pending, "xprt_pending"); | |
1046 | rpc_init_wait_queue(&xprt->sending, "xprt_sending"); | |
1047 | rpc_init_wait_queue(&xprt->resend, "xprt_resend"); | |
1048 | rpc_init_priority_wait_queue(&xprt->backlog, "xprt_backlog"); | |
1049 | ||
1050 | /* initialize free list */ | |
1051 | for (req = &xprt->slot[xprt->max_reqs-1]; req >= &xprt->slot[0]; req--) | |
1052 | list_add(&req->rq_list, &xprt->free); | |
1053 | ||
1054 | xprt_init_xid(xprt); | |
1055 | ||
46121cf7 | 1056 | dprintk("RPC: created transport %p with %u slots\n", xprt, |
c2866763 CL |
1057 | xprt->max_reqs); |
1058 | ||
1059 | return xprt; | |
1060 | } | |
1061 | ||
9903cd1c CL |
1062 | /** |
1063 | * xprt_destroy - destroy an RPC transport, killing off all requests. | |
6b6ca86b | 1064 | * @kref: kref for the transport to destroy |
9903cd1c | 1065 | * |
1da177e4 | 1066 | */ |
6b6ca86b | 1067 | static void xprt_destroy(struct kref *kref) |
1da177e4 | 1068 | { |
6b6ca86b TM |
1069 | struct rpc_xprt *xprt = container_of(kref, struct rpc_xprt, kref); |
1070 | ||
46121cf7 | 1071 | dprintk("RPC: destroying transport %p\n", xprt); |
0065db32 TM |
1072 | xprt->shutdown = 1; |
1073 | del_timer_sync(&xprt->timer); | |
c8541ecd | 1074 | |
f6a1cc89 TM |
1075 | rpc_destroy_wait_queue(&xprt->binding); |
1076 | rpc_destroy_wait_queue(&xprt->pending); | |
1077 | rpc_destroy_wait_queue(&xprt->sending); | |
1078 | rpc_destroy_wait_queue(&xprt->resend); | |
1079 | rpc_destroy_wait_queue(&xprt->backlog); | |
c8541ecd CL |
1080 | /* |
1081 | * Tear down transport state and free the rpc_xprt | |
1082 | */ | |
a246b010 | 1083 | xprt->ops->destroy(xprt); |
6b6ca86b | 1084 | } |
1da177e4 | 1085 | |
6b6ca86b TM |
1086 | /** |
1087 | * xprt_put - release a reference to an RPC transport. | |
1088 | * @xprt: pointer to the transport | |
1089 | * | |
1090 | */ | |
1091 | void xprt_put(struct rpc_xprt *xprt) | |
1092 | { | |
1093 | kref_put(&xprt->kref, xprt_destroy); | |
1094 | } | |
1095 | ||
1096 | /** | |
1097 | * xprt_get - return a reference to an RPC transport. | |
1098 | * @xprt: pointer to the transport | |
1099 | * | |
1100 | */ | |
1101 | struct rpc_xprt *xprt_get(struct rpc_xprt *xprt) | |
1102 | { | |
1103 | kref_get(&xprt->kref); | |
1104 | return xprt; | |
1da177e4 | 1105 | } |