Root/
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 |
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, if a reply is expected, |
16 | * it installs a timer that is run after the packet's timeout has |
17 | * expired. |
18 | * - When a packet arrives, the data_ready handler walks the list of |
19 | * pending requests for that transport. If a matching XID is found, the |
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> |
36 | * |
37 | * Transport switch API copyright (C) 2005, Chuck Lever <cel@netapp.com> |
38 | */ |
39 | |
40 | #include <linux/module.h> |
41 | |
42 | #include <linux/types.h> |
43 | #include <linux/interrupt.h> |
44 | #include <linux/workqueue.h> |
45 | #include <linux/net.h> |
46 | |
47 | #include <linux/sunrpc/clnt.h> |
48 | #include <linux/sunrpc/metrics.h> |
49 | |
50 | #include "sunrpc.h" |
51 | |
52 | /* |
53 | * Local variables |
54 | */ |
55 | |
56 | #ifdef RPC_DEBUG |
57 | # define RPCDBG_FACILITY RPCDBG_XPRT |
58 | #endif |
59 | |
60 | /* |
61 | * Local functions |
62 | */ |
63 | static void xprt_request_init(struct rpc_task *, struct rpc_xprt *); |
64 | static inline void do_xprt_reserve(struct rpc_task *); |
65 | static void xprt_connect_status(struct rpc_task *task); |
66 | static int __xprt_get_cong(struct rpc_xprt *, struct rpc_task *); |
67 | |
68 | static DEFINE_SPINLOCK(xprt_list_lock); |
69 | static LIST_HEAD(xprt_list); |
70 | |
71 | /* |
72 | * The transport code maintains an estimate on the maximum number of out- |
73 | * standing RPC requests, using a smoothed version of the congestion |
74 | * avoidance implemented in 44BSD. This is basically the Van Jacobson |
75 | * congestion algorithm: If a retransmit occurs, the congestion window is |
76 | * halved; otherwise, it is incremented by 1/cwnd when |
77 | * |
78 | * - a reply is received and |
79 | * - a full number of requests are outstanding and |
80 | * - the congestion window hasn't been updated recently. |
81 | */ |
82 | #define RPC_CWNDSHIFT (8U) |
83 | #define RPC_CWNDSCALE (1U << RPC_CWNDSHIFT) |
84 | #define RPC_INITCWND RPC_CWNDSCALE |
85 | #define RPC_MAXCWND(xprt) ((xprt)->max_reqs << RPC_CWNDSHIFT) |
86 | |
87 | #define RPCXPRT_CONGESTED(xprt) ((xprt)->cong >= (xprt)->cwnd) |
88 | |
89 | /** |
90 | * xprt_register_transport - register a transport implementation |
91 | * @transport: transport to register |
92 | * |
93 | * If a transport implementation is loaded as a kernel module, it can |
94 | * call this interface to make itself known to the RPC client. |
95 | * |
96 | * Returns: |
97 | * 0: transport successfully registered |
98 | * -EEXIST: transport already registered |
99 | * -EINVAL: transport module being unloaded |
100 | */ |
101 | int xprt_register_transport(struct xprt_class *transport) |
102 | { |
103 | struct xprt_class *t; |
104 | int result; |
105 | |
106 | result = -EEXIST; |
107 | spin_lock(&xprt_list_lock); |
108 | list_for_each_entry(t, &xprt_list, list) { |
109 | /* don't register the same transport class twice */ |
110 | if (t->ident == transport->ident) |
111 | goto out; |
112 | } |
113 | |
114 | list_add_tail(&transport->list, &xprt_list); |
115 | printk(KERN_INFO "RPC: Registered %s transport module.\n", |
116 | transport->name); |
117 | result = 0; |
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 | goto out; |
147 | } |
148 | } |
149 | result = -ENOENT; |
150 | |
151 | out: |
152 | spin_unlock(&xprt_list_lock); |
153 | return result; |
154 | } |
155 | EXPORT_SYMBOL_GPL(xprt_unregister_transport); |
156 | |
157 | /** |
158 | * xprt_load_transport - load a transport implementation |
159 | * @transport_name: transport to load |
160 | * |
161 | * Returns: |
162 | * 0: transport successfully loaded |
163 | * -ENOENT: transport module not available |
164 | */ |
165 | int xprt_load_transport(const char *transport_name) |
166 | { |
167 | struct xprt_class *t; |
168 | char module_name[sizeof t->name + 5]; |
169 | int result; |
170 | |
171 | result = 0; |
172 | spin_lock(&xprt_list_lock); |
173 | list_for_each_entry(t, &xprt_list, list) { |
174 | if (strcmp(t->name, transport_name) == 0) { |
175 | spin_unlock(&xprt_list_lock); |
176 | goto out; |
177 | } |
178 | } |
179 | spin_unlock(&xprt_list_lock); |
180 | strcpy(module_name, "xprt"); |
181 | strncat(module_name, transport_name, sizeof t->name); |
182 | result = request_module(module_name); |
183 | out: |
184 | return result; |
185 | } |
186 | EXPORT_SYMBOL_GPL(xprt_load_transport); |
187 | |
188 | /** |
189 | * xprt_reserve_xprt - serialize write access to transports |
190 | * @task: task that is requesting access to the transport |
191 | * |
192 | * This prevents mixing the payload of separate requests, and prevents |
193 | * transport connects from colliding with writes. No congestion control |
194 | * is provided. |
195 | */ |
196 | int xprt_reserve_xprt(struct rpc_task *task) |
197 | { |
198 | struct rpc_rqst *req = task->tk_rqstp; |
199 | struct rpc_xprt *xprt = req->rq_xprt; |
200 | |
201 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { |
202 | if (task == xprt->snd_task) |
203 | return 1; |
204 | if (task == NULL) |
205 | return 0; |
206 | goto out_sleep; |
207 | } |
208 | xprt->snd_task = task; |
209 | if (req) { |
210 | req->rq_bytes_sent = 0; |
211 | req->rq_ntrans++; |
212 | } |
213 | return 1; |
214 | |
215 | out_sleep: |
216 | dprintk("RPC: %5u failed to lock transport %p\n", |
217 | task->tk_pid, xprt); |
218 | task->tk_timeout = 0; |
219 | task->tk_status = -EAGAIN; |
220 | if (req && req->rq_ntrans) |
221 | rpc_sleep_on(&xprt->resend, task, NULL); |
222 | else |
223 | rpc_sleep_on(&xprt->sending, task, NULL); |
224 | return 0; |
225 | } |
226 | EXPORT_SYMBOL_GPL(xprt_reserve_xprt); |
227 | |
228 | static void xprt_clear_locked(struct rpc_xprt *xprt) |
229 | { |
230 | xprt->snd_task = NULL; |
231 | if (!test_bit(XPRT_CLOSE_WAIT, &xprt->state) || xprt->shutdown) { |
232 | smp_mb__before_clear_bit(); |
233 | clear_bit(XPRT_LOCKED, &xprt->state); |
234 | smp_mb__after_clear_bit(); |
235 | } else |
236 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
237 | } |
238 | |
239 | /* |
240 | * xprt_reserve_xprt_cong - serialize write access to transports |
241 | * @task: task that is requesting access to the transport |
242 | * |
243 | * Same as xprt_reserve_xprt, but Van Jacobson congestion control is |
244 | * integrated into the decision of whether a request is allowed to be |
245 | * woken up and given access to the transport. |
246 | */ |
247 | int xprt_reserve_xprt_cong(struct rpc_task *task) |
248 | { |
249 | struct rpc_xprt *xprt = task->tk_xprt; |
250 | struct rpc_rqst *req = task->tk_rqstp; |
251 | |
252 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { |
253 | if (task == xprt->snd_task) |
254 | return 1; |
255 | goto out_sleep; |
256 | } |
257 | if (__xprt_get_cong(xprt, task)) { |
258 | xprt->snd_task = task; |
259 | if (req) { |
260 | req->rq_bytes_sent = 0; |
261 | req->rq_ntrans++; |
262 | } |
263 | return 1; |
264 | } |
265 | xprt_clear_locked(xprt); |
266 | out_sleep: |
267 | dprintk("RPC: %5u failed to lock transport %p\n", task->tk_pid, xprt); |
268 | task->tk_timeout = 0; |
269 | task->tk_status = -EAGAIN; |
270 | if (req && req->rq_ntrans) |
271 | rpc_sleep_on(&xprt->resend, task, NULL); |
272 | else |
273 | rpc_sleep_on(&xprt->sending, task, NULL); |
274 | return 0; |
275 | } |
276 | EXPORT_SYMBOL_GPL(xprt_reserve_xprt_cong); |
277 | |
278 | static inline int xprt_lock_write(struct rpc_xprt *xprt, struct rpc_task *task) |
279 | { |
280 | int retval; |
281 | |
282 | spin_lock_bh(&xprt->transport_lock); |
283 | retval = xprt->ops->reserve_xprt(task); |
284 | spin_unlock_bh(&xprt->transport_lock); |
285 | return retval; |
286 | } |
287 | |
288 | static void __xprt_lock_write_next(struct rpc_xprt *xprt) |
289 | { |
290 | struct rpc_task *task; |
291 | struct rpc_rqst *req; |
292 | |
293 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) |
294 | return; |
295 | |
296 | task = rpc_wake_up_next(&xprt->resend); |
297 | if (!task) { |
298 | task = rpc_wake_up_next(&xprt->sending); |
299 | if (!task) |
300 | goto out_unlock; |
301 | } |
302 | |
303 | req = task->tk_rqstp; |
304 | xprt->snd_task = task; |
305 | if (req) { |
306 | req->rq_bytes_sent = 0; |
307 | req->rq_ntrans++; |
308 | } |
309 | return; |
310 | |
311 | out_unlock: |
312 | xprt_clear_locked(xprt); |
313 | } |
314 | |
315 | static void __xprt_lock_write_next_cong(struct rpc_xprt *xprt) |
316 | { |
317 | struct rpc_task *task; |
318 | |
319 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) |
320 | return; |
321 | if (RPCXPRT_CONGESTED(xprt)) |
322 | goto out_unlock; |
323 | task = rpc_wake_up_next(&xprt->resend); |
324 | if (!task) { |
325 | task = rpc_wake_up_next(&xprt->sending); |
326 | if (!task) |
327 | goto out_unlock; |
328 | } |
329 | if (__xprt_get_cong(xprt, task)) { |
330 | struct rpc_rqst *req = task->tk_rqstp; |
331 | xprt->snd_task = task; |
332 | if (req) { |
333 | req->rq_bytes_sent = 0; |
334 | req->rq_ntrans++; |
335 | } |
336 | return; |
337 | } |
338 | out_unlock: |
339 | xprt_clear_locked(xprt); |
340 | } |
341 | |
342 | /** |
343 | * xprt_release_xprt - allow other requests to use a transport |
344 | * @xprt: transport with other tasks potentially waiting |
345 | * @task: task that is releasing access to the transport |
346 | * |
347 | * Note that "task" can be NULL. No congestion control is provided. |
348 | */ |
349 | void xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) |
350 | { |
351 | if (xprt->snd_task == task) { |
352 | xprt_clear_locked(xprt); |
353 | __xprt_lock_write_next(xprt); |
354 | } |
355 | } |
356 | EXPORT_SYMBOL_GPL(xprt_release_xprt); |
357 | |
358 | /** |
359 | * xprt_release_xprt_cong - allow other requests to use a transport |
360 | * @xprt: transport with other tasks potentially waiting |
361 | * @task: task that is releasing access to the transport |
362 | * |
363 | * Note that "task" can be NULL. Another task is awoken to use the |
364 | * transport if the transport's congestion window allows it. |
365 | */ |
366 | void xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task) |
367 | { |
368 | if (xprt->snd_task == task) { |
369 | xprt_clear_locked(xprt); |
370 | __xprt_lock_write_next_cong(xprt); |
371 | } |
372 | } |
373 | EXPORT_SYMBOL_GPL(xprt_release_xprt_cong); |
374 | |
375 | static inline void xprt_release_write(struct rpc_xprt *xprt, struct rpc_task *task) |
376 | { |
377 | spin_lock_bh(&xprt->transport_lock); |
378 | xprt->ops->release_xprt(xprt, task); |
379 | spin_unlock_bh(&xprt->transport_lock); |
380 | } |
381 | |
382 | /* |
383 | * Van Jacobson congestion avoidance. Check if the congestion window |
384 | * overflowed. Put the task to sleep if this is the case. |
385 | */ |
386 | static int |
387 | __xprt_get_cong(struct rpc_xprt *xprt, struct rpc_task *task) |
388 | { |
389 | struct rpc_rqst *req = task->tk_rqstp; |
390 | |
391 | if (req->rq_cong) |
392 | return 1; |
393 | dprintk("RPC: %5u xprt_cwnd_limited cong = %lu cwnd = %lu\n", |
394 | task->tk_pid, xprt->cong, xprt->cwnd); |
395 | if (RPCXPRT_CONGESTED(xprt)) |
396 | return 0; |
397 | req->rq_cong = 1; |
398 | xprt->cong += RPC_CWNDSCALE; |
399 | return 1; |
400 | } |
401 | |
402 | /* |
403 | * Adjust the congestion window, and wake up the next task |
404 | * that has been sleeping due to congestion |
405 | */ |
406 | static void |
407 | __xprt_put_cong(struct rpc_xprt *xprt, struct rpc_rqst *req) |
408 | { |
409 | if (!req->rq_cong) |
410 | return; |
411 | req->rq_cong = 0; |
412 | xprt->cong -= RPC_CWNDSCALE; |
413 | __xprt_lock_write_next_cong(xprt); |
414 | } |
415 | |
416 | /** |
417 | * xprt_release_rqst_cong - housekeeping when request is complete |
418 | * @task: RPC request that recently completed |
419 | * |
420 | * Useful for transports that require congestion control. |
421 | */ |
422 | void xprt_release_rqst_cong(struct rpc_task *task) |
423 | { |
424 | __xprt_put_cong(task->tk_xprt, task->tk_rqstp); |
425 | } |
426 | EXPORT_SYMBOL_GPL(xprt_release_rqst_cong); |
427 | |
428 | /** |
429 | * xprt_adjust_cwnd - adjust transport congestion window |
430 | * @task: recently completed RPC request used to adjust window |
431 | * @result: result code of completed RPC request |
432 | * |
433 | * We use a time-smoothed congestion estimator to avoid heavy oscillation. |
434 | */ |
435 | void xprt_adjust_cwnd(struct rpc_task *task, int result) |
436 | { |
437 | struct rpc_rqst *req = task->tk_rqstp; |
438 | struct rpc_xprt *xprt = task->tk_xprt; |
439 | unsigned long cwnd = xprt->cwnd; |
440 | |
441 | if (result >= 0 && cwnd <= xprt->cong) { |
442 | /* The (cwnd >> 1) term makes sure |
443 | * the result gets rounded properly. */ |
444 | cwnd += (RPC_CWNDSCALE * RPC_CWNDSCALE + (cwnd >> 1)) / cwnd; |
445 | if (cwnd > RPC_MAXCWND(xprt)) |
446 | cwnd = RPC_MAXCWND(xprt); |
447 | __xprt_lock_write_next_cong(xprt); |
448 | } else if (result == -ETIMEDOUT) { |
449 | cwnd >>= 1; |
450 | if (cwnd < RPC_CWNDSCALE) |
451 | cwnd = RPC_CWNDSCALE; |
452 | } |
453 | dprintk("RPC: cong %ld, cwnd was %ld, now %ld\n", |
454 | xprt->cong, xprt->cwnd, cwnd); |
455 | xprt->cwnd = cwnd; |
456 | __xprt_put_cong(xprt, req); |
457 | } |
458 | EXPORT_SYMBOL_GPL(xprt_adjust_cwnd); |
459 | |
460 | /** |
461 | * xprt_wake_pending_tasks - wake all tasks on a transport's pending queue |
462 | * @xprt: transport with waiting tasks |
463 | * @status: result code to plant in each task before waking it |
464 | * |
465 | */ |
466 | void xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status) |
467 | { |
468 | if (status < 0) |
469 | rpc_wake_up_status(&xprt->pending, status); |
470 | else |
471 | rpc_wake_up(&xprt->pending); |
472 | } |
473 | EXPORT_SYMBOL_GPL(xprt_wake_pending_tasks); |
474 | |
475 | /** |
476 | * xprt_wait_for_buffer_space - wait for transport output buffer to clear |
477 | * @task: task to be put to sleep |
478 | * @action: function pointer to be executed after wait |
479 | */ |
480 | void xprt_wait_for_buffer_space(struct rpc_task *task, rpc_action action) |
481 | { |
482 | struct rpc_rqst *req = task->tk_rqstp; |
483 | struct rpc_xprt *xprt = req->rq_xprt; |
484 | |
485 | task->tk_timeout = req->rq_timeout; |
486 | rpc_sleep_on(&xprt->pending, task, action); |
487 | } |
488 | EXPORT_SYMBOL_GPL(xprt_wait_for_buffer_space); |
489 | |
490 | /** |
491 | * xprt_write_space - wake the task waiting for transport output buffer space |
492 | * @xprt: transport with waiting tasks |
493 | * |
494 | * Can be called in a soft IRQ context, so xprt_write_space never sleeps. |
495 | */ |
496 | void xprt_write_space(struct rpc_xprt *xprt) |
497 | { |
498 | if (unlikely(xprt->shutdown)) |
499 | return; |
500 | |
501 | spin_lock_bh(&xprt->transport_lock); |
502 | if (xprt->snd_task) { |
503 | dprintk("RPC: write space: waking waiting task on " |
504 | "xprt %p\n", xprt); |
505 | rpc_wake_up_queued_task(&xprt->pending, xprt->snd_task); |
506 | } |
507 | spin_unlock_bh(&xprt->transport_lock); |
508 | } |
509 | EXPORT_SYMBOL_GPL(xprt_write_space); |
510 | |
511 | /** |
512 | * xprt_set_retrans_timeout_def - set a request's retransmit timeout |
513 | * @task: task whose timeout is to be set |
514 | * |
515 | * Set a request's retransmit timeout based on the transport's |
516 | * default timeout parameters. Used by transports that don't adjust |
517 | * the retransmit timeout based on round-trip time estimation. |
518 | */ |
519 | void xprt_set_retrans_timeout_def(struct rpc_task *task) |
520 | { |
521 | task->tk_timeout = task->tk_rqstp->rq_timeout; |
522 | } |
523 | EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_def); |
524 | |
525 | /* |
526 | * xprt_set_retrans_timeout_rtt - set a request's retransmit timeout |
527 | * @task: task whose timeout is to be set |
528 | * |
529 | * Set a request's retransmit timeout using the RTT estimator. |
530 | */ |
531 | void xprt_set_retrans_timeout_rtt(struct rpc_task *task) |
532 | { |
533 | int timer = task->tk_msg.rpc_proc->p_timer; |
534 | struct rpc_clnt *clnt = task->tk_client; |
535 | struct rpc_rtt *rtt = clnt->cl_rtt; |
536 | struct rpc_rqst *req = task->tk_rqstp; |
537 | unsigned long max_timeout = clnt->cl_timeout->to_maxval; |
538 | |
539 | task->tk_timeout = rpc_calc_rto(rtt, timer); |
540 | task->tk_timeout <<= rpc_ntimeo(rtt, timer) + req->rq_retries; |
541 | if (task->tk_timeout > max_timeout || task->tk_timeout == 0) |
542 | task->tk_timeout = max_timeout; |
543 | } |
544 | EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_rtt); |
545 | |
546 | static void xprt_reset_majortimeo(struct rpc_rqst *req) |
547 | { |
548 | const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout; |
549 | |
550 | req->rq_majortimeo = req->rq_timeout; |
551 | if (to->to_exponential) |
552 | req->rq_majortimeo <<= to->to_retries; |
553 | else |
554 | req->rq_majortimeo += to->to_increment * to->to_retries; |
555 | if (req->rq_majortimeo > to->to_maxval || req->rq_majortimeo == 0) |
556 | req->rq_majortimeo = to->to_maxval; |
557 | req->rq_majortimeo += jiffies; |
558 | } |
559 | |
560 | /** |
561 | * xprt_adjust_timeout - adjust timeout values for next retransmit |
562 | * @req: RPC request containing parameters to use for the adjustment |
563 | * |
564 | */ |
565 | int xprt_adjust_timeout(struct rpc_rqst *req) |
566 | { |
567 | struct rpc_xprt *xprt = req->rq_xprt; |
568 | const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout; |
569 | int status = 0; |
570 | |
571 | if (time_before(jiffies, req->rq_majortimeo)) { |
572 | if (to->to_exponential) |
573 | req->rq_timeout <<= 1; |
574 | else |
575 | req->rq_timeout += to->to_increment; |
576 | if (to->to_maxval && req->rq_timeout >= to->to_maxval) |
577 | req->rq_timeout = to->to_maxval; |
578 | req->rq_retries++; |
579 | } else { |
580 | req->rq_timeout = to->to_initval; |
581 | req->rq_retries = 0; |
582 | xprt_reset_majortimeo(req); |
583 | /* Reset the RTT counters == "slow start" */ |
584 | spin_lock_bh(&xprt->transport_lock); |
585 | rpc_init_rtt(req->rq_task->tk_client->cl_rtt, to->to_initval); |
586 | spin_unlock_bh(&xprt->transport_lock); |
587 | status = -ETIMEDOUT; |
588 | } |
589 | |
590 | if (req->rq_timeout == 0) { |
591 | printk(KERN_WARNING "xprt_adjust_timeout: rq_timeout = 0!\n"); |
592 | req->rq_timeout = 5 * HZ; |
593 | } |
594 | return status; |
595 | } |
596 | |
597 | static void xprt_autoclose(struct work_struct *work) |
598 | { |
599 | struct rpc_xprt *xprt = |
600 | container_of(work, struct rpc_xprt, task_cleanup); |
601 | |
602 | xprt->ops->close(xprt); |
603 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
604 | xprt_release_write(xprt, NULL); |
605 | } |
606 | |
607 | /** |
608 | * xprt_disconnect_done - mark a transport as disconnected |
609 | * @xprt: transport to flag for disconnect |
610 | * |
611 | */ |
612 | void xprt_disconnect_done(struct rpc_xprt *xprt) |
613 | { |
614 | dprintk("RPC: disconnected transport %p\n", xprt); |
615 | spin_lock_bh(&xprt->transport_lock); |
616 | xprt_clear_connected(xprt); |
617 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
618 | spin_unlock_bh(&xprt->transport_lock); |
619 | } |
620 | EXPORT_SYMBOL_GPL(xprt_disconnect_done); |
621 | |
622 | /** |
623 | * xprt_force_disconnect - force a transport to disconnect |
624 | * @xprt: transport to disconnect |
625 | * |
626 | */ |
627 | void xprt_force_disconnect(struct rpc_xprt *xprt) |
628 | { |
629 | /* Don't race with the test_bit() in xprt_clear_locked() */ |
630 | spin_lock_bh(&xprt->transport_lock); |
631 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); |
632 | /* Try to schedule an autoclose RPC call */ |
633 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) |
634 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
635 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
636 | spin_unlock_bh(&xprt->transport_lock); |
637 | } |
638 | |
639 | /** |
640 | * xprt_conditional_disconnect - force a transport to disconnect |
641 | * @xprt: transport to disconnect |
642 | * @cookie: 'connection cookie' |
643 | * |
644 | * This attempts to break the connection if and only if 'cookie' matches |
645 | * the current transport 'connection cookie'. It ensures that we don't |
646 | * try to break the connection more than once when we need to retransmit |
647 | * a batch of RPC requests. |
648 | * |
649 | */ |
650 | void xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie) |
651 | { |
652 | /* Don't race with the test_bit() in xprt_clear_locked() */ |
653 | spin_lock_bh(&xprt->transport_lock); |
654 | if (cookie != xprt->connect_cookie) |
655 | goto out; |
656 | if (test_bit(XPRT_CLOSING, &xprt->state) || !xprt_connected(xprt)) |
657 | goto out; |
658 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); |
659 | /* Try to schedule an autoclose RPC call */ |
660 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) |
661 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
662 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
663 | out: |
664 | spin_unlock_bh(&xprt->transport_lock); |
665 | } |
666 | |
667 | static void |
668 | xprt_init_autodisconnect(unsigned long data) |
669 | { |
670 | struct rpc_xprt *xprt = (struct rpc_xprt *)data; |
671 | |
672 | spin_lock(&xprt->transport_lock); |
673 | if (!list_empty(&xprt->recv) || xprt->shutdown) |
674 | goto out_abort; |
675 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) |
676 | goto out_abort; |
677 | spin_unlock(&xprt->transport_lock); |
678 | set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); |
679 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
680 | return; |
681 | out_abort: |
682 | spin_unlock(&xprt->transport_lock); |
683 | } |
684 | |
685 | /** |
686 | * xprt_connect - schedule a transport connect operation |
687 | * @task: RPC task that is requesting the connect |
688 | * |
689 | */ |
690 | void xprt_connect(struct rpc_task *task) |
691 | { |
692 | struct rpc_xprt *xprt = task->tk_xprt; |
693 | |
694 | dprintk("RPC: %5u xprt_connect xprt %p %s connected\n", task->tk_pid, |
695 | xprt, (xprt_connected(xprt) ? "is" : "is not")); |
696 | |
697 | if (!xprt_bound(xprt)) { |
698 | task->tk_status = -EAGAIN; |
699 | return; |
700 | } |
701 | if (!xprt_lock_write(xprt, task)) |
702 | return; |
703 | if (xprt_connected(xprt)) |
704 | xprt_release_write(xprt, task); |
705 | else { |
706 | if (task->tk_rqstp) |
707 | task->tk_rqstp->rq_bytes_sent = 0; |
708 | |
709 | task->tk_timeout = xprt->connect_timeout; |
710 | rpc_sleep_on(&xprt->pending, task, xprt_connect_status); |
711 | xprt->stat.connect_start = jiffies; |
712 | xprt->ops->connect(task); |
713 | } |
714 | return; |
715 | } |
716 | |
717 | static void xprt_connect_status(struct rpc_task *task) |
718 | { |
719 | struct rpc_xprt *xprt = task->tk_xprt; |
720 | |
721 | if (task->tk_status == 0) { |
722 | xprt->stat.connect_count++; |
723 | xprt->stat.connect_time += (long)jiffies - xprt->stat.connect_start; |
724 | dprintk("RPC: %5u xprt_connect_status: connection established\n", |
725 | task->tk_pid); |
726 | return; |
727 | } |
728 | |
729 | switch (task->tk_status) { |
730 | case -EAGAIN: |
731 | dprintk("RPC: %5u xprt_connect_status: retrying\n", task->tk_pid); |
732 | break; |
733 | case -ETIMEDOUT: |
734 | dprintk("RPC: %5u xprt_connect_status: connect attempt timed " |
735 | "out\n", task->tk_pid); |
736 | break; |
737 | default: |
738 | dprintk("RPC: %5u xprt_connect_status: error %d connecting to " |
739 | "server %s\n", task->tk_pid, -task->tk_status, |
740 | task->tk_client->cl_server); |
741 | xprt_release_write(xprt, task); |
742 | task->tk_status = -EIO; |
743 | } |
744 | } |
745 | |
746 | /** |
747 | * xprt_lookup_rqst - find an RPC request corresponding to an XID |
748 | * @xprt: transport on which the original request was transmitted |
749 | * @xid: RPC XID of incoming reply |
750 | * |
751 | */ |
752 | struct rpc_rqst *xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid) |
753 | { |
754 | struct list_head *pos; |
755 | |
756 | list_for_each(pos, &xprt->recv) { |
757 | struct rpc_rqst *entry = list_entry(pos, struct rpc_rqst, rq_list); |
758 | if (entry->rq_xid == xid) |
759 | return entry; |
760 | } |
761 | |
762 | dprintk("RPC: xprt_lookup_rqst did not find xid %08x\n", |
763 | ntohl(xid)); |
764 | xprt->stat.bad_xids++; |
765 | return NULL; |
766 | } |
767 | EXPORT_SYMBOL_GPL(xprt_lookup_rqst); |
768 | |
769 | /** |
770 | * xprt_update_rtt - update an RPC client's RTT state after receiving a reply |
771 | * @task: RPC request that recently completed |
772 | * |
773 | */ |
774 | void xprt_update_rtt(struct rpc_task *task) |
775 | { |
776 | struct rpc_rqst *req = task->tk_rqstp; |
777 | struct rpc_rtt *rtt = task->tk_client->cl_rtt; |
778 | unsigned timer = task->tk_msg.rpc_proc->p_timer; |
779 | |
780 | if (timer) { |
781 | if (req->rq_ntrans == 1) |
782 | rpc_update_rtt(rtt, timer, |
783 | (long)jiffies - req->rq_xtime); |
784 | rpc_set_timeo(rtt, timer, req->rq_ntrans - 1); |
785 | } |
786 | } |
787 | EXPORT_SYMBOL_GPL(xprt_update_rtt); |
788 | |
789 | /** |
790 | * xprt_complete_rqst - called when reply processing is complete |
791 | * @task: RPC request that recently completed |
792 | * @copied: actual number of bytes received from the transport |
793 | * |
794 | * Caller holds transport lock. |
795 | */ |
796 | void xprt_complete_rqst(struct rpc_task *task, int copied) |
797 | { |
798 | struct rpc_rqst *req = task->tk_rqstp; |
799 | struct rpc_xprt *xprt = req->rq_xprt; |
800 | |
801 | dprintk("RPC: %5u xid %08x complete (%d bytes received)\n", |
802 | task->tk_pid, ntohl(req->rq_xid), copied); |
803 | |
804 | xprt->stat.recvs++; |
805 | task->tk_rtt = (long)jiffies - req->rq_xtime; |
806 | |
807 | list_del_init(&req->rq_list); |
808 | req->rq_private_buf.len = copied; |
809 | /* Ensure all writes are done before we update */ |
810 | /* req->rq_reply_bytes_recvd */ |
811 | smp_wmb(); |
812 | req->rq_reply_bytes_recvd = copied; |
813 | rpc_wake_up_queued_task(&xprt->pending, task); |
814 | } |
815 | EXPORT_SYMBOL_GPL(xprt_complete_rqst); |
816 | |
817 | static void xprt_timer(struct rpc_task *task) |
818 | { |
819 | struct rpc_rqst *req = task->tk_rqstp; |
820 | struct rpc_xprt *xprt = req->rq_xprt; |
821 | |
822 | if (task->tk_status != -ETIMEDOUT) |
823 | return; |
824 | dprintk("RPC: %5u xprt_timer\n", task->tk_pid); |
825 | |
826 | spin_lock_bh(&xprt->transport_lock); |
827 | if (!req->rq_reply_bytes_recvd) { |
828 | if (xprt->ops->timer) |
829 | xprt->ops->timer(task); |
830 | } else |
831 | task->tk_status = 0; |
832 | spin_unlock_bh(&xprt->transport_lock); |
833 | } |
834 | |
835 | static inline int xprt_has_timer(struct rpc_xprt *xprt) |
836 | { |
837 | return xprt->idle_timeout != 0; |
838 | } |
839 | |
840 | /** |
841 | * xprt_prepare_transmit - reserve the transport before sending a request |
842 | * @task: RPC task about to send a request |
843 | * |
844 | */ |
845 | int xprt_prepare_transmit(struct rpc_task *task) |
846 | { |
847 | struct rpc_rqst *req = task->tk_rqstp; |
848 | struct rpc_xprt *xprt = req->rq_xprt; |
849 | int err = 0; |
850 | |
851 | dprintk("RPC: %5u xprt_prepare_transmit\n", task->tk_pid); |
852 | |
853 | spin_lock_bh(&xprt->transport_lock); |
854 | if (req->rq_reply_bytes_recvd && !req->rq_bytes_sent) { |
855 | err = req->rq_reply_bytes_recvd; |
856 | goto out_unlock; |
857 | } |
858 | if (!xprt->ops->reserve_xprt(task)) |
859 | err = -EAGAIN; |
860 | out_unlock: |
861 | spin_unlock_bh(&xprt->transport_lock); |
862 | return err; |
863 | } |
864 | |
865 | void xprt_end_transmit(struct rpc_task *task) |
866 | { |
867 | xprt_release_write(task->tk_rqstp->rq_xprt, task); |
868 | } |
869 | |
870 | /** |
871 | * xprt_transmit - send an RPC request on a transport |
872 | * @task: controlling RPC task |
873 | * |
874 | * We have to copy the iovec because sendmsg fiddles with its contents. |
875 | */ |
876 | void xprt_transmit(struct rpc_task *task) |
877 | { |
878 | struct rpc_rqst *req = task->tk_rqstp; |
879 | struct rpc_xprt *xprt = req->rq_xprt; |
880 | int status; |
881 | |
882 | dprintk("RPC: %5u xprt_transmit(%u)\n", task->tk_pid, req->rq_slen); |
883 | |
884 | if (!req->rq_reply_bytes_recvd) { |
885 | if (list_empty(&req->rq_list) && rpc_reply_expected(task)) { |
886 | /* |
887 | * Add to the list only if we're expecting a reply |
888 | */ |
889 | spin_lock_bh(&xprt->transport_lock); |
890 | /* Update the softirq receive buffer */ |
891 | memcpy(&req->rq_private_buf, &req->rq_rcv_buf, |
892 | sizeof(req->rq_private_buf)); |
893 | /* Add request to the receive list */ |
894 | list_add_tail(&req->rq_list, &xprt->recv); |
895 | spin_unlock_bh(&xprt->transport_lock); |
896 | xprt_reset_majortimeo(req); |
897 | /* Turn off autodisconnect */ |
898 | del_singleshot_timer_sync(&xprt->timer); |
899 | } |
900 | } else if (!req->rq_bytes_sent) |
901 | return; |
902 | |
903 | req->rq_connect_cookie = xprt->connect_cookie; |
904 | req->rq_xtime = jiffies; |
905 | status = xprt->ops->send_request(task); |
906 | if (status != 0) { |
907 | task->tk_status = status; |
908 | return; |
909 | } |
910 | |
911 | dprintk("RPC: %5u xmit complete\n", task->tk_pid); |
912 | spin_lock_bh(&xprt->transport_lock); |
913 | |
914 | xprt->ops->set_retrans_timeout(task); |
915 | |
916 | xprt->stat.sends++; |
917 | xprt->stat.req_u += xprt->stat.sends - xprt->stat.recvs; |
918 | xprt->stat.bklog_u += xprt->backlog.qlen; |
919 | |
920 | /* Don't race with disconnect */ |
921 | if (!xprt_connected(xprt)) |
922 | task->tk_status = -ENOTCONN; |
923 | else if (!req->rq_reply_bytes_recvd && rpc_reply_expected(task)) { |
924 | /* |
925 | * Sleep on the pending queue since |
926 | * we're expecting a reply. |
927 | */ |
928 | rpc_sleep_on(&xprt->pending, task, xprt_timer); |
929 | } |
930 | spin_unlock_bh(&xprt->transport_lock); |
931 | } |
932 | |
933 | static inline void do_xprt_reserve(struct rpc_task *task) |
934 | { |
935 | struct rpc_xprt *xprt = task->tk_xprt; |
936 | |
937 | task->tk_status = 0; |
938 | if (task->tk_rqstp) |
939 | return; |
940 | if (!list_empty(&xprt->free)) { |
941 | struct rpc_rqst *req = list_entry(xprt->free.next, struct rpc_rqst, rq_list); |
942 | list_del_init(&req->rq_list); |
943 | task->tk_rqstp = req; |
944 | xprt_request_init(task, xprt); |
945 | return; |
946 | } |
947 | dprintk("RPC: waiting for request slot\n"); |
948 | task->tk_status = -EAGAIN; |
949 | task->tk_timeout = 0; |
950 | rpc_sleep_on(&xprt->backlog, task, NULL); |
951 | } |
952 | |
953 | /** |
954 | * xprt_reserve - allocate an RPC request slot |
955 | * @task: RPC task requesting a slot allocation |
956 | * |
957 | * If no more slots are available, place the task on the transport's |
958 | * backlog queue. |
959 | */ |
960 | void xprt_reserve(struct rpc_task *task) |
961 | { |
962 | struct rpc_xprt *xprt = task->tk_xprt; |
963 | |
964 | task->tk_status = -EIO; |
965 | spin_lock(&xprt->reserve_lock); |
966 | do_xprt_reserve(task); |
967 | spin_unlock(&xprt->reserve_lock); |
968 | } |
969 | |
970 | static inline __be32 xprt_alloc_xid(struct rpc_xprt *xprt) |
971 | { |
972 | return xprt->xid++; |
973 | } |
974 | |
975 | static inline void xprt_init_xid(struct rpc_xprt *xprt) |
976 | { |
977 | xprt->xid = net_random(); |
978 | } |
979 | |
980 | static void xprt_request_init(struct rpc_task *task, struct rpc_xprt *xprt) |
981 | { |
982 | struct rpc_rqst *req = task->tk_rqstp; |
983 | |
984 | req->rq_timeout = task->tk_client->cl_timeout->to_initval; |
985 | req->rq_task = task; |
986 | req->rq_xprt = xprt; |
987 | req->rq_buffer = NULL; |
988 | req->rq_xid = xprt_alloc_xid(xprt); |
989 | req->rq_release_snd_buf = NULL; |
990 | xprt_reset_majortimeo(req); |
991 | dprintk("RPC: %5u reserved req %p xid %08x\n", task->tk_pid, |
992 | req, ntohl(req->rq_xid)); |
993 | } |
994 | |
995 | /** |
996 | * xprt_release - release an RPC request slot |
997 | * @task: task which is finished with the slot |
998 | * |
999 | */ |
1000 | void xprt_release(struct rpc_task *task) |
1001 | { |
1002 | struct rpc_xprt *xprt; |
1003 | struct rpc_rqst *req; |
1004 | int is_bc_request; |
1005 | |
1006 | if (!(req = task->tk_rqstp)) |
1007 | return; |
1008 | |
1009 | /* Preallocated backchannel request? */ |
1010 | is_bc_request = bc_prealloc(req); |
1011 | |
1012 | xprt = req->rq_xprt; |
1013 | rpc_count_iostats(task); |
1014 | spin_lock_bh(&xprt->transport_lock); |
1015 | xprt->ops->release_xprt(xprt, task); |
1016 | if (xprt->ops->release_request) |
1017 | xprt->ops->release_request(task); |
1018 | if (!list_empty(&req->rq_list)) |
1019 | list_del(&req->rq_list); |
1020 | xprt->last_used = jiffies; |
1021 | if (list_empty(&xprt->recv) && xprt_has_timer(xprt)) |
1022 | mod_timer(&xprt->timer, |
1023 | xprt->last_used + xprt->idle_timeout); |
1024 | spin_unlock_bh(&xprt->transport_lock); |
1025 | if (!bc_prealloc(req)) |
1026 | xprt->ops->buf_free(req->rq_buffer); |
1027 | task->tk_rqstp = NULL; |
1028 | if (req->rq_release_snd_buf) |
1029 | req->rq_release_snd_buf(req); |
1030 | |
1031 | /* |
1032 | * Early exit if this is a backchannel preallocated request. |
1033 | * There is no need to have it added to the RPC slot list. |
1034 | */ |
1035 | if (is_bc_request) |
1036 | return; |
1037 | |
1038 | memset(req, 0, sizeof(*req)); /* mark unused */ |
1039 | |
1040 | dprintk("RPC: %5u release request %p\n", task->tk_pid, req); |
1041 | |
1042 | spin_lock(&xprt->reserve_lock); |
1043 | list_add(&req->rq_list, &xprt->free); |
1044 | rpc_wake_up_next(&xprt->backlog); |
1045 | spin_unlock(&xprt->reserve_lock); |
1046 | } |
1047 | |
1048 | /** |
1049 | * xprt_create_transport - create an RPC transport |
1050 | * @args: rpc transport creation arguments |
1051 | * |
1052 | */ |
1053 | struct rpc_xprt *xprt_create_transport(struct xprt_create *args) |
1054 | { |
1055 | struct rpc_xprt *xprt; |
1056 | struct rpc_rqst *req; |
1057 | struct xprt_class *t; |
1058 | |
1059 | spin_lock(&xprt_list_lock); |
1060 | list_for_each_entry(t, &xprt_list, list) { |
1061 | if (t->ident == args->ident) { |
1062 | spin_unlock(&xprt_list_lock); |
1063 | goto found; |
1064 | } |
1065 | } |
1066 | spin_unlock(&xprt_list_lock); |
1067 | printk(KERN_ERR "RPC: transport (%d) not supported\n", args->ident); |
1068 | return ERR_PTR(-EIO); |
1069 | |
1070 | found: |
1071 | xprt = t->setup(args); |
1072 | if (IS_ERR(xprt)) { |
1073 | dprintk("RPC: xprt_create_transport: failed, %ld\n", |
1074 | -PTR_ERR(xprt)); |
1075 | return xprt; |
1076 | } |
1077 | |
1078 | kref_init(&xprt->kref); |
1079 | spin_lock_init(&xprt->transport_lock); |
1080 | spin_lock_init(&xprt->reserve_lock); |
1081 | |
1082 | INIT_LIST_HEAD(&xprt->free); |
1083 | INIT_LIST_HEAD(&xprt->recv); |
1084 | #if defined(CONFIG_NFS_V4_1) |
1085 | spin_lock_init(&xprt->bc_pa_lock); |
1086 | INIT_LIST_HEAD(&xprt->bc_pa_list); |
1087 | #endif /* CONFIG_NFS_V4_1 */ |
1088 | |
1089 | INIT_WORK(&xprt->task_cleanup, xprt_autoclose); |
1090 | if (xprt_has_timer(xprt)) |
1091 | setup_timer(&xprt->timer, xprt_init_autodisconnect, |
1092 | (unsigned long)xprt); |
1093 | else |
1094 | init_timer(&xprt->timer); |
1095 | xprt->last_used = jiffies; |
1096 | xprt->cwnd = RPC_INITCWND; |
1097 | xprt->bind_index = 0; |
1098 | |
1099 | rpc_init_wait_queue(&xprt->binding, "xprt_binding"); |
1100 | rpc_init_wait_queue(&xprt->pending, "xprt_pending"); |
1101 | rpc_init_wait_queue(&xprt->sending, "xprt_sending"); |
1102 | rpc_init_wait_queue(&xprt->resend, "xprt_resend"); |
1103 | rpc_init_priority_wait_queue(&xprt->backlog, "xprt_backlog"); |
1104 | |
1105 | /* initialize free list */ |
1106 | for (req = &xprt->slot[xprt->max_reqs-1]; req >= &xprt->slot[0]; req--) |
1107 | list_add(&req->rq_list, &xprt->free); |
1108 | |
1109 | xprt_init_xid(xprt); |
1110 | |
1111 | dprintk("RPC: created transport %p with %u slots\n", xprt, |
1112 | xprt->max_reqs); |
1113 | return xprt; |
1114 | } |
1115 | |
1116 | /** |
1117 | * xprt_destroy - destroy an RPC transport, killing off all requests. |
1118 | * @kref: kref for the transport to destroy |
1119 | * |
1120 | */ |
1121 | static void xprt_destroy(struct kref *kref) |
1122 | { |
1123 | struct rpc_xprt *xprt = container_of(kref, struct rpc_xprt, kref); |
1124 | |
1125 | dprintk("RPC: destroying transport %p\n", xprt); |
1126 | xprt->shutdown = 1; |
1127 | del_timer_sync(&xprt->timer); |
1128 | |
1129 | rpc_destroy_wait_queue(&xprt->binding); |
1130 | rpc_destroy_wait_queue(&xprt->pending); |
1131 | rpc_destroy_wait_queue(&xprt->sending); |
1132 | rpc_destroy_wait_queue(&xprt->resend); |
1133 | rpc_destroy_wait_queue(&xprt->backlog); |
1134 | /* |
1135 | * Tear down transport state and free the rpc_xprt |
1136 | */ |
1137 | xprt->ops->destroy(xprt); |
1138 | } |
1139 | |
1140 | /** |
1141 | * xprt_put - release a reference to an RPC transport. |
1142 | * @xprt: pointer to the transport |
1143 | * |
1144 | */ |
1145 | void xprt_put(struct rpc_xprt *xprt) |
1146 | { |
1147 | kref_put(&xprt->kref, xprt_destroy); |
1148 | } |
1149 | |
1150 | /** |
1151 | * xprt_get - return a reference to an RPC transport. |
1152 | * @xprt: pointer to the transport |
1153 | * |
1154 | */ |
1155 | struct rpc_xprt *xprt_get(struct rpc_xprt *xprt) |
1156 | { |
1157 | kref_get(&xprt->kref); |
1158 | return xprt; |
1159 | } |
1160 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9