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 | ||
111 | result = -EINVAL; | |
112 | if (try_module_get(THIS_MODULE)) { | |
113 | list_add_tail(&transport->list, &xprt_list); | |
114 | printk(KERN_INFO "RPC: Registered %s transport module.\n", | |
115 | transport->name); | |
116 | result = 0; | |
117 | } | |
118 | ||
119 | out: | |
120 | spin_unlock(&xprt_list_lock); | |
121 | return result; | |
122 | } | |
123 | EXPORT_SYMBOL_GPL(xprt_register_transport); | |
124 | ||
125 | /** | |
126 | * xprt_unregister_transport - unregister a transport implementation | |
127 | * transport: transport to unregister | |
128 | * | |
129 | * Returns: | |
130 | * 0: transport successfully unregistered | |
131 | * -ENOENT: transport never registered | |
132 | */ | |
133 | int xprt_unregister_transport(struct xprt_class *transport) | |
134 | { | |
135 | struct xprt_class *t; | |
136 | int result; | |
137 | ||
138 | result = 0; | |
139 | spin_lock(&xprt_list_lock); | |
140 | list_for_each_entry(t, &xprt_list, list) { | |
141 | if (t == transport) { | |
142 | printk(KERN_INFO | |
143 | "RPC: Unregistered %s transport module.\n", | |
144 | transport->name); | |
145 | list_del_init(&transport->list); | |
146 | module_put(THIS_MODULE); | |
147 | goto out; | |
148 | } | |
149 | } | |
150 | result = -ENOENT; | |
151 | ||
152 | out: | |
153 | spin_unlock(&xprt_list_lock); | |
154 | return result; | |
155 | } | |
156 | EXPORT_SYMBOL_GPL(xprt_unregister_transport); | |
157 | ||
12a80469 CL |
158 | /** |
159 | * xprt_reserve_xprt - serialize write access to transports | |
160 | * @task: task that is requesting access to the transport | |
161 | * | |
162 | * This prevents mixing the payload of separate requests, and prevents | |
163 | * transport connects from colliding with writes. No congestion control | |
164 | * is provided. | |
165 | */ | |
166 | int xprt_reserve_xprt(struct rpc_task *task) | |
167 | { | |
168 | struct rpc_xprt *xprt = task->tk_xprt; | |
169 | struct rpc_rqst *req = task->tk_rqstp; | |
170 | ||
171 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { | |
172 | if (task == xprt->snd_task) | |
173 | return 1; | |
174 | if (task == NULL) | |
175 | return 0; | |
176 | goto out_sleep; | |
177 | } | |
178 | xprt->snd_task = task; | |
179 | if (req) { | |
180 | req->rq_bytes_sent = 0; | |
181 | req->rq_ntrans++; | |
182 | } | |
183 | return 1; | |
184 | ||
185 | out_sleep: | |
46121cf7 | 186 | dprintk("RPC: %5u failed to lock transport %p\n", |
12a80469 CL |
187 | task->tk_pid, xprt); |
188 | task->tk_timeout = 0; | |
189 | task->tk_status = -EAGAIN; | |
190 | if (req && req->rq_ntrans) | |
191 | rpc_sleep_on(&xprt->resend, task, NULL, NULL); | |
192 | else | |
193 | rpc_sleep_on(&xprt->sending, task, NULL, NULL); | |
194 | return 0; | |
195 | } | |
12444809 | 196 | EXPORT_SYMBOL_GPL(xprt_reserve_xprt); |
12a80469 | 197 | |
632e3bdc TM |
198 | static void xprt_clear_locked(struct rpc_xprt *xprt) |
199 | { | |
200 | xprt->snd_task = NULL; | |
201 | if (!test_bit(XPRT_CLOSE_WAIT, &xprt->state) || xprt->shutdown) { | |
202 | smp_mb__before_clear_bit(); | |
203 | clear_bit(XPRT_LOCKED, &xprt->state); | |
204 | smp_mb__after_clear_bit(); | |
205 | } else | |
c1384c9c | 206 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
632e3bdc TM |
207 | } |
208 | ||
1da177e4 | 209 | /* |
12a80469 CL |
210 | * xprt_reserve_xprt_cong - serialize write access to transports |
211 | * @task: task that is requesting access to the transport | |
212 | * | |
213 | * Same as xprt_reserve_xprt, but Van Jacobson congestion control is | |
214 | * integrated into the decision of whether a request is allowed to be | |
215 | * woken up and given access to the transport. | |
1da177e4 | 216 | */ |
12a80469 | 217 | int xprt_reserve_xprt_cong(struct rpc_task *task) |
1da177e4 | 218 | { |
12a80469 | 219 | struct rpc_xprt *xprt = task->tk_xprt; |
1da177e4 LT |
220 | struct rpc_rqst *req = task->tk_rqstp; |
221 | ||
2226feb6 | 222 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { |
1da177e4 LT |
223 | if (task == xprt->snd_task) |
224 | return 1; | |
1da177e4 LT |
225 | goto out_sleep; |
226 | } | |
12a80469 | 227 | if (__xprt_get_cong(xprt, task)) { |
1da177e4 LT |
228 | xprt->snd_task = task; |
229 | if (req) { | |
230 | req->rq_bytes_sent = 0; | |
231 | req->rq_ntrans++; | |
232 | } | |
233 | return 1; | |
234 | } | |
632e3bdc | 235 | xprt_clear_locked(xprt); |
1da177e4 | 236 | out_sleep: |
46121cf7 | 237 | dprintk("RPC: %5u failed to lock transport %p\n", task->tk_pid, xprt); |
1da177e4 LT |
238 | task->tk_timeout = 0; |
239 | task->tk_status = -EAGAIN; | |
240 | if (req && req->rq_ntrans) | |
241 | rpc_sleep_on(&xprt->resend, task, NULL, NULL); | |
242 | else | |
243 | rpc_sleep_on(&xprt->sending, task, NULL, NULL); | |
244 | return 0; | |
245 | } | |
12444809 | 246 | EXPORT_SYMBOL_GPL(xprt_reserve_xprt_cong); |
1da177e4 | 247 | |
12a80469 | 248 | static inline int xprt_lock_write(struct rpc_xprt *xprt, struct rpc_task *task) |
1da177e4 LT |
249 | { |
250 | int retval; | |
251 | ||
4a0f8c04 | 252 | spin_lock_bh(&xprt->transport_lock); |
12a80469 | 253 | retval = xprt->ops->reserve_xprt(task); |
4a0f8c04 | 254 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 LT |
255 | return retval; |
256 | } | |
257 | ||
12a80469 | 258 | static void __xprt_lock_write_next(struct rpc_xprt *xprt) |
49e9a890 CL |
259 | { |
260 | struct rpc_task *task; | |
261 | struct rpc_rqst *req; | |
262 | ||
263 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) | |
264 | return; | |
265 | ||
266 | task = rpc_wake_up_next(&xprt->resend); | |
267 | if (!task) { | |
268 | task = rpc_wake_up_next(&xprt->sending); | |
269 | if (!task) | |
270 | goto out_unlock; | |
271 | } | |
272 | ||
273 | req = task->tk_rqstp; | |
274 | xprt->snd_task = task; | |
275 | if (req) { | |
276 | req->rq_bytes_sent = 0; | |
277 | req->rq_ntrans++; | |
278 | } | |
279 | return; | |
280 | ||
281 | out_unlock: | |
632e3bdc | 282 | xprt_clear_locked(xprt); |
49e9a890 CL |
283 | } |
284 | ||
285 | static void __xprt_lock_write_next_cong(struct rpc_xprt *xprt) | |
1da177e4 LT |
286 | { |
287 | struct rpc_task *task; | |
288 | ||
2226feb6 | 289 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) |
1da177e4 | 290 | return; |
49e9a890 | 291 | if (RPCXPRT_CONGESTED(xprt)) |
1da177e4 LT |
292 | goto out_unlock; |
293 | task = rpc_wake_up_next(&xprt->resend); | |
294 | if (!task) { | |
295 | task = rpc_wake_up_next(&xprt->sending); | |
296 | if (!task) | |
297 | goto out_unlock; | |
298 | } | |
49e9a890 | 299 | if (__xprt_get_cong(xprt, task)) { |
1da177e4 LT |
300 | struct rpc_rqst *req = task->tk_rqstp; |
301 | xprt->snd_task = task; | |
302 | if (req) { | |
303 | req->rq_bytes_sent = 0; | |
304 | req->rq_ntrans++; | |
305 | } | |
306 | return; | |
307 | } | |
308 | out_unlock: | |
632e3bdc | 309 | xprt_clear_locked(xprt); |
1da177e4 LT |
310 | } |
311 | ||
49e9a890 CL |
312 | /** |
313 | * xprt_release_xprt - allow other requests to use a transport | |
314 | * @xprt: transport with other tasks potentially waiting | |
315 | * @task: task that is releasing access to the transport | |
316 | * | |
317 | * Note that "task" can be NULL. No congestion control is provided. | |
1da177e4 | 318 | */ |
49e9a890 | 319 | void xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) |
1da177e4 LT |
320 | { |
321 | if (xprt->snd_task == task) { | |
632e3bdc | 322 | xprt_clear_locked(xprt); |
1da177e4 LT |
323 | __xprt_lock_write_next(xprt); |
324 | } | |
325 | } | |
12444809 | 326 | EXPORT_SYMBOL_GPL(xprt_release_xprt); |
1da177e4 | 327 | |
49e9a890 CL |
328 | /** |
329 | * xprt_release_xprt_cong - allow other requests to use a transport | |
330 | * @xprt: transport with other tasks potentially waiting | |
331 | * @task: task that is releasing access to the transport | |
332 | * | |
333 | * Note that "task" can be NULL. Another task is awoken to use the | |
334 | * transport if the transport's congestion window allows it. | |
335 | */ | |
336 | void xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task) | |
337 | { | |
338 | if (xprt->snd_task == task) { | |
632e3bdc | 339 | xprt_clear_locked(xprt); |
49e9a890 CL |
340 | __xprt_lock_write_next_cong(xprt); |
341 | } | |
342 | } | |
12444809 | 343 | EXPORT_SYMBOL_GPL(xprt_release_xprt_cong); |
49e9a890 CL |
344 | |
345 | static inline void xprt_release_write(struct rpc_xprt *xprt, struct rpc_task *task) | |
1da177e4 | 346 | { |
4a0f8c04 | 347 | spin_lock_bh(&xprt->transport_lock); |
49e9a890 | 348 | xprt->ops->release_xprt(xprt, task); |
4a0f8c04 | 349 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 LT |
350 | } |
351 | ||
1da177e4 LT |
352 | /* |
353 | * Van Jacobson congestion avoidance. Check if the congestion window | |
354 | * overflowed. Put the task to sleep if this is the case. | |
355 | */ | |
356 | static int | |
357 | __xprt_get_cong(struct rpc_xprt *xprt, struct rpc_task *task) | |
358 | { | |
359 | struct rpc_rqst *req = task->tk_rqstp; | |
360 | ||
361 | if (req->rq_cong) | |
362 | return 1; | |
46121cf7 | 363 | dprintk("RPC: %5u xprt_cwnd_limited cong = %lu cwnd = %lu\n", |
1da177e4 LT |
364 | task->tk_pid, xprt->cong, xprt->cwnd); |
365 | if (RPCXPRT_CONGESTED(xprt)) | |
366 | return 0; | |
367 | req->rq_cong = 1; | |
368 | xprt->cong += RPC_CWNDSCALE; | |
369 | return 1; | |
370 | } | |
371 | ||
372 | /* | |
373 | * Adjust the congestion window, and wake up the next task | |
374 | * that has been sleeping due to congestion | |
375 | */ | |
376 | static void | |
377 | __xprt_put_cong(struct rpc_xprt *xprt, struct rpc_rqst *req) | |
378 | { | |
379 | if (!req->rq_cong) | |
380 | return; | |
381 | req->rq_cong = 0; | |
382 | xprt->cong -= RPC_CWNDSCALE; | |
49e9a890 | 383 | __xprt_lock_write_next_cong(xprt); |
1da177e4 LT |
384 | } |
385 | ||
a58dd398 CL |
386 | /** |
387 | * xprt_release_rqst_cong - housekeeping when request is complete | |
388 | * @task: RPC request that recently completed | |
389 | * | |
390 | * Useful for transports that require congestion control. | |
391 | */ | |
392 | void xprt_release_rqst_cong(struct rpc_task *task) | |
393 | { | |
394 | __xprt_put_cong(task->tk_xprt, task->tk_rqstp); | |
395 | } | |
12444809 | 396 | EXPORT_SYMBOL_GPL(xprt_release_rqst_cong); |
a58dd398 | 397 | |
46c0ee8b CL |
398 | /** |
399 | * xprt_adjust_cwnd - adjust transport congestion window | |
400 | * @task: recently completed RPC request used to adjust window | |
401 | * @result: result code of completed RPC request | |
402 | * | |
1da177e4 LT |
403 | * We use a time-smoothed congestion estimator to avoid heavy oscillation. |
404 | */ | |
46c0ee8b | 405 | void xprt_adjust_cwnd(struct rpc_task *task, int result) |
1da177e4 | 406 | { |
46c0ee8b CL |
407 | struct rpc_rqst *req = task->tk_rqstp; |
408 | struct rpc_xprt *xprt = task->tk_xprt; | |
409 | unsigned long cwnd = xprt->cwnd; | |
1da177e4 | 410 | |
1da177e4 LT |
411 | if (result >= 0 && cwnd <= xprt->cong) { |
412 | /* The (cwnd >> 1) term makes sure | |
413 | * the result gets rounded properly. */ | |
414 | cwnd += (RPC_CWNDSCALE * RPC_CWNDSCALE + (cwnd >> 1)) / cwnd; | |
415 | if (cwnd > RPC_MAXCWND(xprt)) | |
416 | cwnd = RPC_MAXCWND(xprt); | |
49e9a890 | 417 | __xprt_lock_write_next_cong(xprt); |
1da177e4 LT |
418 | } else if (result == -ETIMEDOUT) { |
419 | cwnd >>= 1; | |
420 | if (cwnd < RPC_CWNDSCALE) | |
421 | cwnd = RPC_CWNDSCALE; | |
422 | } | |
46121cf7 | 423 | dprintk("RPC: cong %ld, cwnd was %ld, now %ld\n", |
1da177e4 LT |
424 | xprt->cong, xprt->cwnd, cwnd); |
425 | xprt->cwnd = cwnd; | |
46c0ee8b | 426 | __xprt_put_cong(xprt, req); |
1da177e4 | 427 | } |
12444809 | 428 | EXPORT_SYMBOL_GPL(xprt_adjust_cwnd); |
1da177e4 | 429 | |
44fbac22 CL |
430 | /** |
431 | * xprt_wake_pending_tasks - wake all tasks on a transport's pending queue | |
432 | * @xprt: transport with waiting tasks | |
433 | * @status: result code to plant in each task before waking it | |
434 | * | |
435 | */ | |
436 | void xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status) | |
437 | { | |
438 | if (status < 0) | |
439 | rpc_wake_up_status(&xprt->pending, status); | |
440 | else | |
441 | rpc_wake_up(&xprt->pending); | |
442 | } | |
12444809 | 443 | EXPORT_SYMBOL_GPL(xprt_wake_pending_tasks); |
44fbac22 | 444 | |
c7b2cae8 CL |
445 | /** |
446 | * xprt_wait_for_buffer_space - wait for transport output buffer to clear | |
447 | * @task: task to be put to sleep | |
448 | * | |
449 | */ | |
450 | void xprt_wait_for_buffer_space(struct rpc_task *task) | |
451 | { | |
452 | struct rpc_rqst *req = task->tk_rqstp; | |
453 | struct rpc_xprt *xprt = req->rq_xprt; | |
454 | ||
455 | task->tk_timeout = req->rq_timeout; | |
456 | rpc_sleep_on(&xprt->pending, task, NULL, NULL); | |
457 | } | |
12444809 | 458 | EXPORT_SYMBOL_GPL(xprt_wait_for_buffer_space); |
c7b2cae8 CL |
459 | |
460 | /** | |
461 | * xprt_write_space - wake the task waiting for transport output buffer space | |
462 | * @xprt: transport with waiting tasks | |
463 | * | |
464 | * Can be called in a soft IRQ context, so xprt_write_space never sleeps. | |
465 | */ | |
466 | void xprt_write_space(struct rpc_xprt *xprt) | |
467 | { | |
468 | if (unlikely(xprt->shutdown)) | |
469 | return; | |
470 | ||
471 | spin_lock_bh(&xprt->transport_lock); | |
472 | if (xprt->snd_task) { | |
46121cf7 CL |
473 | dprintk("RPC: write space: waking waiting task on " |
474 | "xprt %p\n", xprt); | |
c7b2cae8 CL |
475 | rpc_wake_up_task(xprt->snd_task); |
476 | } | |
477 | spin_unlock_bh(&xprt->transport_lock); | |
478 | } | |
12444809 | 479 | EXPORT_SYMBOL_GPL(xprt_write_space); |
c7b2cae8 | 480 | |
fe3aca29 CL |
481 | /** |
482 | * xprt_set_retrans_timeout_def - set a request's retransmit timeout | |
483 | * @task: task whose timeout is to be set | |
484 | * | |
485 | * Set a request's retransmit timeout based on the transport's | |
486 | * default timeout parameters. Used by transports that don't adjust | |
487 | * the retransmit timeout based on round-trip time estimation. | |
488 | */ | |
489 | void xprt_set_retrans_timeout_def(struct rpc_task *task) | |
490 | { | |
491 | task->tk_timeout = task->tk_rqstp->rq_timeout; | |
492 | } | |
12444809 | 493 | EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_def); |
fe3aca29 CL |
494 | |
495 | /* | |
496 | * xprt_set_retrans_timeout_rtt - set a request's retransmit timeout | |
497 | * @task: task whose timeout is to be set | |
cca5172a | 498 | * |
fe3aca29 CL |
499 | * Set a request's retransmit timeout using the RTT estimator. |
500 | */ | |
501 | void xprt_set_retrans_timeout_rtt(struct rpc_task *task) | |
502 | { | |
503 | int timer = task->tk_msg.rpc_proc->p_timer; | |
504 | struct rpc_rtt *rtt = task->tk_client->cl_rtt; | |
505 | struct rpc_rqst *req = task->tk_rqstp; | |
506 | unsigned long max_timeout = req->rq_xprt->timeout.to_maxval; | |
507 | ||
508 | task->tk_timeout = rpc_calc_rto(rtt, timer); | |
509 | task->tk_timeout <<= rpc_ntimeo(rtt, timer) + req->rq_retries; | |
510 | if (task->tk_timeout > max_timeout || task->tk_timeout == 0) | |
511 | task->tk_timeout = max_timeout; | |
512 | } | |
12444809 | 513 | EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_rtt); |
fe3aca29 | 514 | |
1da177e4 LT |
515 | static void xprt_reset_majortimeo(struct rpc_rqst *req) |
516 | { | |
517 | struct rpc_timeout *to = &req->rq_xprt->timeout; | |
518 | ||
519 | req->rq_majortimeo = req->rq_timeout; | |
520 | if (to->to_exponential) | |
521 | req->rq_majortimeo <<= to->to_retries; | |
522 | else | |
523 | req->rq_majortimeo += to->to_increment * to->to_retries; | |
524 | if (req->rq_majortimeo > to->to_maxval || req->rq_majortimeo == 0) | |
525 | req->rq_majortimeo = to->to_maxval; | |
526 | req->rq_majortimeo += jiffies; | |
527 | } | |
528 | ||
9903cd1c CL |
529 | /** |
530 | * xprt_adjust_timeout - adjust timeout values for next retransmit | |
531 | * @req: RPC request containing parameters to use for the adjustment | |
532 | * | |
1da177e4 LT |
533 | */ |
534 | int xprt_adjust_timeout(struct rpc_rqst *req) | |
535 | { | |
536 | struct rpc_xprt *xprt = req->rq_xprt; | |
537 | struct rpc_timeout *to = &xprt->timeout; | |
538 | int status = 0; | |
539 | ||
540 | if (time_before(jiffies, req->rq_majortimeo)) { | |
541 | if (to->to_exponential) | |
542 | req->rq_timeout <<= 1; | |
543 | else | |
544 | req->rq_timeout += to->to_increment; | |
545 | if (to->to_maxval && req->rq_timeout >= to->to_maxval) | |
546 | req->rq_timeout = to->to_maxval; | |
547 | req->rq_retries++; | |
1da177e4 LT |
548 | } else { |
549 | req->rq_timeout = to->to_initval; | |
550 | req->rq_retries = 0; | |
551 | xprt_reset_majortimeo(req); | |
552 | /* Reset the RTT counters == "slow start" */ | |
4a0f8c04 | 553 | spin_lock_bh(&xprt->transport_lock); |
1da177e4 | 554 | rpc_init_rtt(req->rq_task->tk_client->cl_rtt, to->to_initval); |
4a0f8c04 | 555 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 LT |
556 | status = -ETIMEDOUT; |
557 | } | |
558 | ||
559 | if (req->rq_timeout == 0) { | |
560 | printk(KERN_WARNING "xprt_adjust_timeout: rq_timeout = 0!\n"); | |
561 | req->rq_timeout = 5 * HZ; | |
562 | } | |
563 | return status; | |
564 | } | |
565 | ||
65f27f38 | 566 | static void xprt_autoclose(struct work_struct *work) |
1da177e4 | 567 | { |
65f27f38 DH |
568 | struct rpc_xprt *xprt = |
569 | container_of(work, struct rpc_xprt, task_cleanup); | |
1da177e4 | 570 | |
a246b010 | 571 | xprt->ops->close(xprt); |
66af1e55 | 572 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
1da177e4 LT |
573 | xprt_release_write(xprt, NULL); |
574 | } | |
575 | ||
9903cd1c CL |
576 | /** |
577 | * xprt_disconnect - mark a transport as disconnected | |
578 | * @xprt: transport to flag for disconnect | |
579 | * | |
1da177e4 | 580 | */ |
a246b010 | 581 | void xprt_disconnect(struct rpc_xprt *xprt) |
1da177e4 | 582 | { |
46121cf7 | 583 | dprintk("RPC: disconnected transport %p\n", xprt); |
4a0f8c04 | 584 | spin_lock_bh(&xprt->transport_lock); |
1da177e4 | 585 | xprt_clear_connected(xprt); |
44fbac22 | 586 | xprt_wake_pending_tasks(xprt, -ENOTCONN); |
4a0f8c04 | 587 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 | 588 | } |
12444809 | 589 | EXPORT_SYMBOL_GPL(xprt_disconnect); |
1da177e4 | 590 | |
66af1e55 TM |
591 | /** |
592 | * xprt_force_disconnect - force a transport to disconnect | |
593 | * @xprt: transport to disconnect | |
594 | * | |
595 | */ | |
596 | void xprt_force_disconnect(struct rpc_xprt *xprt) | |
597 | { | |
598 | /* Don't race with the test_bit() in xprt_clear_locked() */ | |
599 | spin_lock_bh(&xprt->transport_lock); | |
600 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
601 | /* Try to schedule an autoclose RPC call */ | |
602 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) | |
603 | queue_work(rpciod_workqueue, &xprt->task_cleanup); | |
604 | else if (xprt->snd_task != NULL) | |
605 | rpc_wake_up_task(xprt->snd_task); | |
606 | spin_unlock_bh(&xprt->transport_lock); | |
607 | } | |
608 | EXPORT_SYMBOL_GPL(xprt_force_disconnect); | |
609 | ||
1da177e4 LT |
610 | static void |
611 | xprt_init_autodisconnect(unsigned long data) | |
612 | { | |
613 | struct rpc_xprt *xprt = (struct rpc_xprt *)data; | |
614 | ||
4a0f8c04 | 615 | spin_lock(&xprt->transport_lock); |
1da177e4 LT |
616 | if (!list_empty(&xprt->recv) || xprt->shutdown) |
617 | goto out_abort; | |
2226feb6 | 618 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) |
1da177e4 | 619 | goto out_abort; |
4a0f8c04 | 620 | spin_unlock(&xprt->transport_lock); |
2226feb6 | 621 | if (xprt_connecting(xprt)) |
1da177e4 LT |
622 | xprt_release_write(xprt, NULL); |
623 | else | |
c1384c9c | 624 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
1da177e4 LT |
625 | return; |
626 | out_abort: | |
4a0f8c04 | 627 | spin_unlock(&xprt->transport_lock); |
1da177e4 LT |
628 | } |
629 | ||
9903cd1c CL |
630 | /** |
631 | * xprt_connect - schedule a transport connect operation | |
632 | * @task: RPC task that is requesting the connect | |
1da177e4 LT |
633 | * |
634 | */ | |
635 | void xprt_connect(struct rpc_task *task) | |
636 | { | |
637 | struct rpc_xprt *xprt = task->tk_xprt; | |
638 | ||
46121cf7 | 639 | dprintk("RPC: %5u xprt_connect xprt %p %s connected\n", task->tk_pid, |
1da177e4 LT |
640 | xprt, (xprt_connected(xprt) ? "is" : "is not")); |
641 | ||
ec739ef0 | 642 | if (!xprt_bound(xprt)) { |
1da177e4 LT |
643 | task->tk_status = -EIO; |
644 | return; | |
645 | } | |
646 | if (!xprt_lock_write(xprt, task)) | |
647 | return; | |
648 | if (xprt_connected(xprt)) | |
a246b010 CL |
649 | xprt_release_write(xprt, task); |
650 | else { | |
651 | if (task->tk_rqstp) | |
652 | task->tk_rqstp->rq_bytes_sent = 0; | |
1da177e4 | 653 | |
03bf4b70 | 654 | task->tk_timeout = xprt->connect_timeout; |
a246b010 | 655 | rpc_sleep_on(&xprt->pending, task, xprt_connect_status, NULL); |
262ca07d | 656 | xprt->stat.connect_start = jiffies; |
a246b010 | 657 | xprt->ops->connect(task); |
1da177e4 LT |
658 | } |
659 | return; | |
1da177e4 LT |
660 | } |
661 | ||
9903cd1c | 662 | static void xprt_connect_status(struct rpc_task *task) |
1da177e4 LT |
663 | { |
664 | struct rpc_xprt *xprt = task->tk_xprt; | |
665 | ||
666 | if (task->tk_status >= 0) { | |
262ca07d CL |
667 | xprt->stat.connect_count++; |
668 | xprt->stat.connect_time += (long)jiffies - xprt->stat.connect_start; | |
46121cf7 | 669 | dprintk("RPC: %5u xprt_connect_status: connection established\n", |
1da177e4 LT |
670 | task->tk_pid); |
671 | return; | |
672 | } | |
673 | ||
1da177e4 LT |
674 | switch (task->tk_status) { |
675 | case -ECONNREFUSED: | |
676 | case -ECONNRESET: | |
46121cf7 CL |
677 | dprintk("RPC: %5u xprt_connect_status: server %s refused " |
678 | "connection\n", task->tk_pid, | |
679 | task->tk_client->cl_server); | |
23475d66 | 680 | break; |
1da177e4 | 681 | case -ENOTCONN: |
46121cf7 | 682 | dprintk("RPC: %5u xprt_connect_status: connection broken\n", |
23475d66 CL |
683 | task->tk_pid); |
684 | break; | |
1da177e4 | 685 | case -ETIMEDOUT: |
46121cf7 CL |
686 | dprintk("RPC: %5u xprt_connect_status: connect attempt timed " |
687 | "out\n", task->tk_pid); | |
1da177e4 LT |
688 | break; |
689 | default: | |
46121cf7 CL |
690 | dprintk("RPC: %5u xprt_connect_status: error %d connecting to " |
691 | "server %s\n", task->tk_pid, -task->tk_status, | |
692 | task->tk_client->cl_server); | |
23475d66 CL |
693 | xprt_release_write(xprt, task); |
694 | task->tk_status = -EIO; | |
1da177e4 | 695 | } |
1da177e4 LT |
696 | } |
697 | ||
9903cd1c CL |
698 | /** |
699 | * xprt_lookup_rqst - find an RPC request corresponding to an XID | |
700 | * @xprt: transport on which the original request was transmitted | |
701 | * @xid: RPC XID of incoming reply | |
702 | * | |
1da177e4 | 703 | */ |
d8ed029d | 704 | struct rpc_rqst *xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid) |
1da177e4 LT |
705 | { |
706 | struct list_head *pos; | |
1da177e4 LT |
707 | |
708 | list_for_each(pos, &xprt->recv) { | |
709 | struct rpc_rqst *entry = list_entry(pos, struct rpc_rqst, rq_list); | |
262ca07d CL |
710 | if (entry->rq_xid == xid) |
711 | return entry; | |
1da177e4 | 712 | } |
46121cf7 CL |
713 | |
714 | dprintk("RPC: xprt_lookup_rqst did not find xid %08x\n", | |
715 | ntohl(xid)); | |
262ca07d CL |
716 | xprt->stat.bad_xids++; |
717 | return NULL; | |
1da177e4 | 718 | } |
12444809 | 719 | EXPORT_SYMBOL_GPL(xprt_lookup_rqst); |
1da177e4 | 720 | |
1570c1e4 CL |
721 | /** |
722 | * xprt_update_rtt - update an RPC client's RTT state after receiving a reply | |
723 | * @task: RPC request that recently completed | |
724 | * | |
725 | */ | |
726 | void xprt_update_rtt(struct rpc_task *task) | |
727 | { | |
728 | struct rpc_rqst *req = task->tk_rqstp; | |
729 | struct rpc_rtt *rtt = task->tk_client->cl_rtt; | |
730 | unsigned timer = task->tk_msg.rpc_proc->p_timer; | |
731 | ||
732 | if (timer) { | |
733 | if (req->rq_ntrans == 1) | |
734 | rpc_update_rtt(rtt, timer, | |
735 | (long)jiffies - req->rq_xtime); | |
736 | rpc_set_timeo(rtt, timer, req->rq_ntrans - 1); | |
737 | } | |
738 | } | |
12444809 | 739 | EXPORT_SYMBOL_GPL(xprt_update_rtt); |
1570c1e4 | 740 | |
9903cd1c CL |
741 | /** |
742 | * xprt_complete_rqst - called when reply processing is complete | |
1570c1e4 | 743 | * @task: RPC request that recently completed |
9903cd1c CL |
744 | * @copied: actual number of bytes received from the transport |
745 | * | |
1570c1e4 | 746 | * Caller holds transport lock. |
1da177e4 | 747 | */ |
1570c1e4 | 748 | void xprt_complete_rqst(struct rpc_task *task, int copied) |
1da177e4 | 749 | { |
1570c1e4 | 750 | struct rpc_rqst *req = task->tk_rqstp; |
1da177e4 | 751 | |
1570c1e4 CL |
752 | dprintk("RPC: %5u xid %08x complete (%d bytes received)\n", |
753 | task->tk_pid, ntohl(req->rq_xid), copied); | |
1da177e4 | 754 | |
262ca07d | 755 | task->tk_xprt->stat.recvs++; |
ef759a2e CL |
756 | task->tk_rtt = (long)jiffies - req->rq_xtime; |
757 | ||
1da177e4 | 758 | list_del_init(&req->rq_list); |
43ac3f29 TM |
759 | /* Ensure all writes are done before we update req->rq_received */ |
760 | smp_wmb(); | |
1da177e4 | 761 | req->rq_received = req->rq_private_buf.len = copied; |
1da177e4 | 762 | rpc_wake_up_task(task); |
1da177e4 | 763 | } |
12444809 | 764 | EXPORT_SYMBOL_GPL(xprt_complete_rqst); |
1da177e4 | 765 | |
46c0ee8b | 766 | static void xprt_timer(struct rpc_task *task) |
1da177e4 | 767 | { |
46c0ee8b | 768 | struct rpc_rqst *req = task->tk_rqstp; |
1da177e4 LT |
769 | struct rpc_xprt *xprt = req->rq_xprt; |
770 | ||
46121cf7 | 771 | dprintk("RPC: %5u xprt_timer\n", task->tk_pid); |
1da177e4 | 772 | |
46c0ee8b CL |
773 | spin_lock(&xprt->transport_lock); |
774 | if (!req->rq_received) { | |
775 | if (xprt->ops->timer) | |
776 | xprt->ops->timer(task); | |
777 | task->tk_status = -ETIMEDOUT; | |
778 | } | |
1da177e4 LT |
779 | task->tk_timeout = 0; |
780 | rpc_wake_up_task(task); | |
4a0f8c04 | 781 | spin_unlock(&xprt->transport_lock); |
1da177e4 LT |
782 | } |
783 | ||
9903cd1c CL |
784 | /** |
785 | * xprt_prepare_transmit - reserve the transport before sending a request | |
786 | * @task: RPC task about to send a request | |
787 | * | |
1da177e4 | 788 | */ |
9903cd1c | 789 | int xprt_prepare_transmit(struct rpc_task *task) |
1da177e4 LT |
790 | { |
791 | struct rpc_rqst *req = task->tk_rqstp; | |
792 | struct rpc_xprt *xprt = req->rq_xprt; | |
793 | int err = 0; | |
794 | ||
46121cf7 | 795 | dprintk("RPC: %5u xprt_prepare_transmit\n", task->tk_pid); |
1da177e4 | 796 | |
4a0f8c04 | 797 | spin_lock_bh(&xprt->transport_lock); |
1da177e4 LT |
798 | if (req->rq_received && !req->rq_bytes_sent) { |
799 | err = req->rq_received; | |
800 | goto out_unlock; | |
801 | } | |
12a80469 | 802 | if (!xprt->ops->reserve_xprt(task)) { |
1da177e4 LT |
803 | err = -EAGAIN; |
804 | goto out_unlock; | |
805 | } | |
806 | ||
807 | if (!xprt_connected(xprt)) { | |
808 | err = -ENOTCONN; | |
809 | goto out_unlock; | |
810 | } | |
811 | out_unlock: | |
4a0f8c04 | 812 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 LT |
813 | return err; |
814 | } | |
815 | ||
e0ab53de | 816 | void xprt_end_transmit(struct rpc_task *task) |
5e5ce5be | 817 | { |
e0ab53de | 818 | xprt_release_write(task->tk_xprt, task); |
5e5ce5be TM |
819 | } |
820 | ||
9903cd1c CL |
821 | /** |
822 | * xprt_transmit - send an RPC request on a transport | |
823 | * @task: controlling RPC task | |
824 | * | |
825 | * We have to copy the iovec because sendmsg fiddles with its contents. | |
826 | */ | |
827 | void xprt_transmit(struct rpc_task *task) | |
1da177e4 | 828 | { |
1da177e4 LT |
829 | struct rpc_rqst *req = task->tk_rqstp; |
830 | struct rpc_xprt *xprt = req->rq_xprt; | |
a246b010 | 831 | int status; |
1da177e4 | 832 | |
46121cf7 | 833 | dprintk("RPC: %5u xprt_transmit(%u)\n", task->tk_pid, req->rq_slen); |
1da177e4 | 834 | |
1da177e4 LT |
835 | if (!req->rq_received) { |
836 | if (list_empty(&req->rq_list)) { | |
4a0f8c04 | 837 | spin_lock_bh(&xprt->transport_lock); |
1da177e4 LT |
838 | /* Update the softirq receive buffer */ |
839 | memcpy(&req->rq_private_buf, &req->rq_rcv_buf, | |
840 | sizeof(req->rq_private_buf)); | |
841 | /* Add request to the receive list */ | |
842 | list_add_tail(&req->rq_list, &xprt->recv); | |
4a0f8c04 | 843 | spin_unlock_bh(&xprt->transport_lock); |
1da177e4 | 844 | xprt_reset_majortimeo(req); |
0f9dc2b1 TM |
845 | /* Turn off autodisconnect */ |
846 | del_singleshot_timer_sync(&xprt->timer); | |
1da177e4 LT |
847 | } |
848 | } else if (!req->rq_bytes_sent) | |
849 | return; | |
850 | ||
a246b010 | 851 | status = xprt->ops->send_request(task); |
fe3aca29 | 852 | if (status == 0) { |
46121cf7 | 853 | dprintk("RPC: %5u xmit complete\n", task->tk_pid); |
fe3aca29 | 854 | spin_lock_bh(&xprt->transport_lock); |
262ca07d | 855 | |
fe3aca29 | 856 | xprt->ops->set_retrans_timeout(task); |
262ca07d CL |
857 | |
858 | xprt->stat.sends++; | |
859 | xprt->stat.req_u += xprt->stat.sends - xprt->stat.recvs; | |
860 | xprt->stat.bklog_u += xprt->backlog.qlen; | |
861 | ||
fe3aca29 CL |
862 | /* Don't race with disconnect */ |
863 | if (!xprt_connected(xprt)) | |
864 | task->tk_status = -ENOTCONN; | |
865 | else if (!req->rq_received) | |
866 | rpc_sleep_on(&xprt->pending, task, NULL, xprt_timer); | |
fe3aca29 CL |
867 | spin_unlock_bh(&xprt->transport_lock); |
868 | return; | |
869 | } | |
1da177e4 LT |
870 | |
871 | /* Note: at this point, task->tk_sleeping has not yet been set, | |
872 | * hence there is no danger of the waking up task being put on | |
873 | * schedq, and being picked up by a parallel run of rpciod(). | |
874 | */ | |
875 | task->tk_status = status; | |
e0ab53de | 876 | if (status == -ECONNREFUSED) |
1da177e4 | 877 | rpc_sleep_on(&xprt->sending, task, NULL, NULL); |
1da177e4 LT |
878 | } |
879 | ||
9903cd1c | 880 | static inline void do_xprt_reserve(struct rpc_task *task) |
1da177e4 LT |
881 | { |
882 | struct rpc_xprt *xprt = task->tk_xprt; | |
883 | ||
884 | task->tk_status = 0; | |
885 | if (task->tk_rqstp) | |
886 | return; | |
887 | if (!list_empty(&xprt->free)) { | |
888 | struct rpc_rqst *req = list_entry(xprt->free.next, struct rpc_rqst, rq_list); | |
889 | list_del_init(&req->rq_list); | |
890 | task->tk_rqstp = req; | |
891 | xprt_request_init(task, xprt); | |
892 | return; | |
893 | } | |
46121cf7 | 894 | dprintk("RPC: waiting for request slot\n"); |
1da177e4 LT |
895 | task->tk_status = -EAGAIN; |
896 | task->tk_timeout = 0; | |
897 | rpc_sleep_on(&xprt->backlog, task, NULL, NULL); | |
898 | } | |
899 | ||
9903cd1c CL |
900 | /** |
901 | * xprt_reserve - allocate an RPC request slot | |
902 | * @task: RPC task requesting a slot allocation | |
903 | * | |
904 | * If no more slots are available, place the task on the transport's | |
905 | * backlog queue. | |
906 | */ | |
907 | void xprt_reserve(struct rpc_task *task) | |
1da177e4 LT |
908 | { |
909 | struct rpc_xprt *xprt = task->tk_xprt; | |
910 | ||
911 | task->tk_status = -EIO; | |
0065db32 TM |
912 | spin_lock(&xprt->reserve_lock); |
913 | do_xprt_reserve(task); | |
914 | spin_unlock(&xprt->reserve_lock); | |
1da177e4 LT |
915 | } |
916 | ||
d8ed029d | 917 | static inline __be32 xprt_alloc_xid(struct rpc_xprt *xprt) |
1da177e4 LT |
918 | { |
919 | return xprt->xid++; | |
920 | } | |
921 | ||
922 | static inline void xprt_init_xid(struct rpc_xprt *xprt) | |
923 | { | |
bf3fcf89 | 924 | xprt->xid = net_random(); |
1da177e4 LT |
925 | } |
926 | ||
9903cd1c | 927 | static void xprt_request_init(struct rpc_task *task, struct rpc_xprt *xprt) |
1da177e4 LT |
928 | { |
929 | struct rpc_rqst *req = task->tk_rqstp; | |
930 | ||
931 | req->rq_timeout = xprt->timeout.to_initval; | |
932 | req->rq_task = task; | |
933 | req->rq_xprt = xprt; | |
02107148 | 934 | req->rq_buffer = NULL; |
1da177e4 | 935 | req->rq_xid = xprt_alloc_xid(xprt); |
ead5e1c2 | 936 | req->rq_release_snd_buf = NULL; |
da45828e | 937 | xprt_reset_majortimeo(req); |
46121cf7 | 938 | dprintk("RPC: %5u reserved req %p xid %08x\n", task->tk_pid, |
1da177e4 LT |
939 | req, ntohl(req->rq_xid)); |
940 | } | |
941 | ||
9903cd1c CL |
942 | /** |
943 | * xprt_release - release an RPC request slot | |
944 | * @task: task which is finished with the slot | |
945 | * | |
1da177e4 | 946 | */ |
9903cd1c | 947 | void xprt_release(struct rpc_task *task) |
1da177e4 LT |
948 | { |
949 | struct rpc_xprt *xprt = task->tk_xprt; | |
950 | struct rpc_rqst *req; | |
951 | ||
952 | if (!(req = task->tk_rqstp)) | |
953 | return; | |
11c556b3 | 954 | rpc_count_iostats(task); |
4a0f8c04 | 955 | spin_lock_bh(&xprt->transport_lock); |
49e9a890 | 956 | xprt->ops->release_xprt(xprt, task); |
a58dd398 CL |
957 | if (xprt->ops->release_request) |
958 | xprt->ops->release_request(task); | |
1da177e4 LT |
959 | if (!list_empty(&req->rq_list)) |
960 | list_del(&req->rq_list); | |
961 | xprt->last_used = jiffies; | |
0065db32 | 962 | if (list_empty(&xprt->recv)) |
a246b010 | 963 | mod_timer(&xprt->timer, |
03bf4b70 | 964 | xprt->last_used + xprt->idle_timeout); |
4a0f8c04 | 965 | spin_unlock_bh(&xprt->transport_lock); |
c5a4dd8b | 966 | xprt->ops->buf_free(req->rq_buffer); |
1da177e4 | 967 | task->tk_rqstp = NULL; |
ead5e1c2 BF |
968 | if (req->rq_release_snd_buf) |
969 | req->rq_release_snd_buf(req); | |
1da177e4 LT |
970 | memset(req, 0, sizeof(*req)); /* mark unused */ |
971 | ||
46121cf7 | 972 | dprintk("RPC: %5u release request %p\n", task->tk_pid, req); |
1da177e4 | 973 | |
5dc07727 | 974 | spin_lock(&xprt->reserve_lock); |
1da177e4 | 975 | list_add(&req->rq_list, &xprt->free); |
555ee3af | 976 | rpc_wake_up_next(&xprt->backlog); |
5dc07727 | 977 | spin_unlock(&xprt->reserve_lock); |
1da177e4 LT |
978 | } |
979 | ||
9903cd1c CL |
980 | /** |
981 | * xprt_set_timeout - set constant RPC timeout | |
982 | * @to: RPC timeout parameters to set up | |
983 | * @retr: number of retries | |
984 | * @incr: amount of increase after each retry | |
985 | * | |
1da177e4 | 986 | */ |
9903cd1c | 987 | void xprt_set_timeout(struct rpc_timeout *to, unsigned int retr, unsigned long incr) |
1da177e4 | 988 | { |
cca5172a | 989 | to->to_initval = |
1da177e4 | 990 | to->to_increment = incr; |
eab5c084 | 991 | to->to_maxval = to->to_initval + (incr * retr); |
1da177e4 LT |
992 | to->to_retries = retr; |
993 | to->to_exponential = 0; | |
994 | } | |
995 | ||
c2866763 CL |
996 | /** |
997 | * xprt_create_transport - create an RPC transport | |
96802a09 | 998 | * @args: rpc transport creation arguments |
c2866763 CL |
999 | * |
1000 | */ | |
3c341b0b | 1001 | struct rpc_xprt *xprt_create_transport(struct xprt_create *args) |
c2866763 | 1002 | { |
c2866763 CL |
1003 | struct rpc_xprt *xprt; |
1004 | struct rpc_rqst *req; | |
bc25571e | 1005 | struct xprt_class *t; |
c2866763 | 1006 | |
bc25571e TT |
1007 | spin_lock(&xprt_list_lock); |
1008 | list_for_each_entry(t, &xprt_list, list) { | |
4fa016eb | 1009 | if (t->ident == args->ident) { |
bc25571e TT |
1010 | spin_unlock(&xprt_list_lock); |
1011 | goto found; | |
1012 | } | |
c2866763 | 1013 | } |
bc25571e | 1014 | spin_unlock(&xprt_list_lock); |
4fa016eb | 1015 | printk(KERN_ERR "RPC: transport (%d) not supported\n", args->ident); |
bc25571e TT |
1016 | return ERR_PTR(-EIO); |
1017 | ||
1018 | found: | |
1019 | xprt = t->setup(args); | |
c8541ecd | 1020 | if (IS_ERR(xprt)) { |
46121cf7 | 1021 | dprintk("RPC: xprt_create_transport: failed, %ld\n", |
c8541ecd CL |
1022 | -PTR_ERR(xprt)); |
1023 | return xprt; | |
c2866763 CL |
1024 | } |
1025 | ||
6b6ca86b | 1026 | kref_init(&xprt->kref); |
c2866763 CL |
1027 | spin_lock_init(&xprt->transport_lock); |
1028 | spin_lock_init(&xprt->reserve_lock); | |
1029 | ||
1030 | INIT_LIST_HEAD(&xprt->free); | |
1031 | INIT_LIST_HEAD(&xprt->recv); | |
65f27f38 | 1032 | INIT_WORK(&xprt->task_cleanup, xprt_autoclose); |
b24b8a24 PE |
1033 | setup_timer(&xprt->timer, xprt_init_autodisconnect, |
1034 | (unsigned long)xprt); | |
c2866763 CL |
1035 | xprt->last_used = jiffies; |
1036 | xprt->cwnd = RPC_INITCWND; | |
a509050b | 1037 | xprt->bind_index = 0; |
c2866763 CL |
1038 | |
1039 | rpc_init_wait_queue(&xprt->binding, "xprt_binding"); | |
1040 | rpc_init_wait_queue(&xprt->pending, "xprt_pending"); | |
1041 | rpc_init_wait_queue(&xprt->sending, "xprt_sending"); | |
1042 | rpc_init_wait_queue(&xprt->resend, "xprt_resend"); | |
1043 | rpc_init_priority_wait_queue(&xprt->backlog, "xprt_backlog"); | |
1044 | ||
1045 | /* initialize free list */ | |
1046 | for (req = &xprt->slot[xprt->max_reqs-1]; req >= &xprt->slot[0]; req--) | |
1047 | list_add(&req->rq_list, &xprt->free); | |
1048 | ||
1049 | xprt_init_xid(xprt); | |
1050 | ||
46121cf7 | 1051 | dprintk("RPC: created transport %p with %u slots\n", xprt, |
c2866763 CL |
1052 | xprt->max_reqs); |
1053 | ||
1054 | return xprt; | |
1055 | } | |
1056 | ||
9903cd1c CL |
1057 | /** |
1058 | * xprt_destroy - destroy an RPC transport, killing off all requests. | |
6b6ca86b | 1059 | * @kref: kref for the transport to destroy |
9903cd1c | 1060 | * |
1da177e4 | 1061 | */ |
6b6ca86b | 1062 | static void xprt_destroy(struct kref *kref) |
1da177e4 | 1063 | { |
6b6ca86b TM |
1064 | struct rpc_xprt *xprt = container_of(kref, struct rpc_xprt, kref); |
1065 | ||
46121cf7 | 1066 | dprintk("RPC: destroying transport %p\n", xprt); |
0065db32 TM |
1067 | xprt->shutdown = 1; |
1068 | del_timer_sync(&xprt->timer); | |
c8541ecd CL |
1069 | |
1070 | /* | |
1071 | * Tear down transport state and free the rpc_xprt | |
1072 | */ | |
a246b010 | 1073 | xprt->ops->destroy(xprt); |
6b6ca86b | 1074 | } |
1da177e4 | 1075 | |
6b6ca86b TM |
1076 | /** |
1077 | * xprt_put - release a reference to an RPC transport. | |
1078 | * @xprt: pointer to the transport | |
1079 | * | |
1080 | */ | |
1081 | void xprt_put(struct rpc_xprt *xprt) | |
1082 | { | |
1083 | kref_put(&xprt->kref, xprt_destroy); | |
1084 | } | |
1085 | ||
1086 | /** | |
1087 | * xprt_get - return a reference to an RPC transport. | |
1088 | * @xprt: pointer to the transport | |
1089 | * | |
1090 | */ | |
1091 | struct rpc_xprt *xprt_get(struct rpc_xprt *xprt) | |
1092 | { | |
1093 | kref_get(&xprt->kref); | |
1094 | return xprt; | |
1da177e4 | 1095 | } |