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 | #include <linux/ktime.h> |
47 | |
48 | #include <linux/sunrpc/clnt.h> |
49 | #include <linux/sunrpc/metrics.h> |
50 | #include <linux/sunrpc/bc_xprt.h> |
51 | |
52 | #include "sunrpc.h" |
53 | |
54 | /* |
55 | * Local variables |
56 | */ |
57 | |
58 | #ifdef RPC_DEBUG |
59 | # define RPCDBG_FACILITY RPCDBG_XPRT |
60 | #endif |
61 | |
62 | /* |
63 | * Local functions |
64 | */ |
65 | static void xprt_request_init(struct rpc_task *, struct rpc_xprt *); |
66 | static void xprt_connect_status(struct rpc_task *task); |
67 | static int __xprt_get_cong(struct rpc_xprt *, struct rpc_task *); |
68 | |
69 | static DEFINE_SPINLOCK(xprt_list_lock); |
70 | static LIST_HEAD(xprt_list); |
71 | |
72 | /* |
73 | * The transport code maintains an estimate on the maximum number of out- |
74 | * standing RPC requests, using a smoothed version of the congestion |
75 | * avoidance implemented in 44BSD. This is basically the Van Jacobson |
76 | * congestion algorithm: If a retransmit occurs, the congestion window is |
77 | * halved; otherwise, it is incremented by 1/cwnd when |
78 | * |
79 | * - a reply is received and |
80 | * - a full number of requests are outstanding and |
81 | * - the congestion window hasn't been updated recently. |
82 | */ |
83 | #define RPC_CWNDSHIFT (8U) |
84 | #define RPC_CWNDSCALE (1U << RPC_CWNDSHIFT) |
85 | #define RPC_INITCWND RPC_CWNDSCALE |
86 | #define RPC_MAXCWND(xprt) ((xprt)->max_reqs << RPC_CWNDSHIFT) |
87 | |
88 | #define RPCXPRT_CONGESTED(xprt) ((xprt)->cong >= (xprt)->cwnd) |
89 | |
90 | /** |
91 | * xprt_register_transport - register a transport implementation |
92 | * @transport: transport to register |
93 | * |
94 | * If a transport implementation is loaded as a kernel module, it can |
95 | * call this interface to make itself known to the RPC client. |
96 | * |
97 | * Returns: |
98 | * 0: transport successfully registered |
99 | * -EEXIST: transport already registered |
100 | * -EINVAL: transport module being unloaded |
101 | */ |
102 | int xprt_register_transport(struct xprt_class *transport) |
103 | { |
104 | struct xprt_class *t; |
105 | int result; |
106 | |
107 | result = -EEXIST; |
108 | spin_lock(&xprt_list_lock); |
109 | list_for_each_entry(t, &xprt_list, list) { |
110 | /* don't register the same transport class twice */ |
111 | if (t->ident == transport->ident) |
112 | goto out; |
113 | } |
114 | |
115 | list_add_tail(&transport->list, &xprt_list); |
116 | printk(KERN_INFO "RPC: Registered %s transport module.\n", |
117 | transport->name); |
118 | result = 0; |
119 | |
120 | out: |
121 | spin_unlock(&xprt_list_lock); |
122 | return result; |
123 | } |
124 | EXPORT_SYMBOL_GPL(xprt_register_transport); |
125 | |
126 | /** |
127 | * xprt_unregister_transport - unregister a transport implementation |
128 | * @transport: transport to unregister |
129 | * |
130 | * Returns: |
131 | * 0: transport successfully unregistered |
132 | * -ENOENT: transport never registered |
133 | */ |
134 | int xprt_unregister_transport(struct xprt_class *transport) |
135 | { |
136 | struct xprt_class *t; |
137 | int result; |
138 | |
139 | result = 0; |
140 | spin_lock(&xprt_list_lock); |
141 | list_for_each_entry(t, &xprt_list, list) { |
142 | if (t == transport) { |
143 | printk(KERN_INFO |
144 | "RPC: Unregistered %s transport module.\n", |
145 | transport->name); |
146 | list_del_init(&transport->list); |
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 | |
158 | /** |
159 | * xprt_load_transport - load a transport implementation |
160 | * @transport_name: transport to load |
161 | * |
162 | * Returns: |
163 | * 0: transport successfully loaded |
164 | * -ENOENT: transport module not available |
165 | */ |
166 | int xprt_load_transport(const char *transport_name) |
167 | { |
168 | struct xprt_class *t; |
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 | result = request_module("xprt%s", transport_name); |
181 | out: |
182 | return result; |
183 | } |
184 | EXPORT_SYMBOL_GPL(xprt_load_transport); |
185 | |
186 | /** |
187 | * xprt_reserve_xprt - serialize write access to transports |
188 | * @task: task that is requesting access to the transport |
189 | * |
190 | * This prevents mixing the payload of separate requests, and prevents |
191 | * transport connects from colliding with writes. No congestion control |
192 | * is provided. |
193 | */ |
194 | int xprt_reserve_xprt(struct rpc_task *task) |
195 | { |
196 | struct rpc_rqst *req = task->tk_rqstp; |
197 | struct rpc_xprt *xprt = req->rq_xprt; |
198 | |
199 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { |
200 | if (task == xprt->snd_task) |
201 | return 1; |
202 | if (task == NULL) |
203 | return 0; |
204 | goto out_sleep; |
205 | } |
206 | xprt->snd_task = task; |
207 | if (req) { |
208 | req->rq_bytes_sent = 0; |
209 | req->rq_ntrans++; |
210 | } |
211 | return 1; |
212 | |
213 | out_sleep: |
214 | dprintk("RPC: %5u failed to lock transport %p\n", |
215 | task->tk_pid, xprt); |
216 | task->tk_timeout = 0; |
217 | task->tk_status = -EAGAIN; |
218 | if (req && req->rq_ntrans) |
219 | rpc_sleep_on(&xprt->resend, task, NULL); |
220 | else |
221 | rpc_sleep_on(&xprt->sending, task, NULL); |
222 | return 0; |
223 | } |
224 | EXPORT_SYMBOL_GPL(xprt_reserve_xprt); |
225 | |
226 | static void xprt_clear_locked(struct rpc_xprt *xprt) |
227 | { |
228 | xprt->snd_task = NULL; |
229 | if (!test_bit(XPRT_CLOSE_WAIT, &xprt->state) || xprt->shutdown) { |
230 | smp_mb__before_clear_bit(); |
231 | clear_bit(XPRT_LOCKED, &xprt->state); |
232 | smp_mb__after_clear_bit(); |
233 | } else |
234 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
235 | } |
236 | |
237 | /* |
238 | * xprt_reserve_xprt_cong - serialize write access to transports |
239 | * @task: task that is requesting access to the transport |
240 | * |
241 | * Same as xprt_reserve_xprt, but Van Jacobson congestion control is |
242 | * integrated into the decision of whether a request is allowed to be |
243 | * woken up and given access to the transport. |
244 | */ |
245 | int xprt_reserve_xprt_cong(struct rpc_task *task) |
246 | { |
247 | struct rpc_xprt *xprt = task->tk_xprt; |
248 | struct rpc_rqst *req = task->tk_rqstp; |
249 | |
250 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { |
251 | if (task == xprt->snd_task) |
252 | return 1; |
253 | goto out_sleep; |
254 | } |
255 | if (__xprt_get_cong(xprt, task)) { |
256 | xprt->snd_task = task; |
257 | if (req) { |
258 | req->rq_bytes_sent = 0; |
259 | req->rq_ntrans++; |
260 | } |
261 | return 1; |
262 | } |
263 | xprt_clear_locked(xprt); |
264 | out_sleep: |
265 | dprintk("RPC: %5u failed to lock transport %p\n", task->tk_pid, xprt); |
266 | task->tk_timeout = 0; |
267 | task->tk_status = -EAGAIN; |
268 | if (req && req->rq_ntrans) |
269 | rpc_sleep_on(&xprt->resend, task, NULL); |
270 | else |
271 | rpc_sleep_on(&xprt->sending, task, NULL); |
272 | return 0; |
273 | } |
274 | EXPORT_SYMBOL_GPL(xprt_reserve_xprt_cong); |
275 | |
276 | static inline int xprt_lock_write(struct rpc_xprt *xprt, struct rpc_task *task) |
277 | { |
278 | int retval; |
279 | |
280 | spin_lock_bh(&xprt->transport_lock); |
281 | retval = xprt->ops->reserve_xprt(task); |
282 | spin_unlock_bh(&xprt->transport_lock); |
283 | return retval; |
284 | } |
285 | |
286 | static void __xprt_lock_write_next(struct rpc_xprt *xprt) |
287 | { |
288 | struct rpc_task *task; |
289 | struct rpc_rqst *req; |
290 | |
291 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) |
292 | return; |
293 | |
294 | task = rpc_wake_up_next(&xprt->resend); |
295 | if (!task) { |
296 | task = rpc_wake_up_next(&xprt->sending); |
297 | if (!task) |
298 | goto out_unlock; |
299 | } |
300 | |
301 | req = task->tk_rqstp; |
302 | xprt->snd_task = task; |
303 | if (req) { |
304 | req->rq_bytes_sent = 0; |
305 | req->rq_ntrans++; |
306 | } |
307 | return; |
308 | |
309 | out_unlock: |
310 | xprt_clear_locked(xprt); |
311 | } |
312 | |
313 | static void __xprt_lock_write_next_cong(struct rpc_xprt *xprt) |
314 | { |
315 | struct rpc_task *task; |
316 | |
317 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) |
318 | return; |
319 | if (RPCXPRT_CONGESTED(xprt)) |
320 | goto out_unlock; |
321 | task = rpc_wake_up_next(&xprt->resend); |
322 | if (!task) { |
323 | task = rpc_wake_up_next(&xprt->sending); |
324 | if (!task) |
325 | goto out_unlock; |
326 | } |
327 | if (__xprt_get_cong(xprt, task)) { |
328 | struct rpc_rqst *req = task->tk_rqstp; |
329 | xprt->snd_task = task; |
330 | if (req) { |
331 | req->rq_bytes_sent = 0; |
332 | req->rq_ntrans++; |
333 | } |
334 | return; |
335 | } |
336 | out_unlock: |
337 | xprt_clear_locked(xprt); |
338 | } |
339 | |
340 | /** |
341 | * xprt_release_xprt - allow other requests to use a transport |
342 | * @xprt: transport with other tasks potentially waiting |
343 | * @task: task that is releasing access to the transport |
344 | * |
345 | * Note that "task" can be NULL. No congestion control is provided. |
346 | */ |
347 | void xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) |
348 | { |
349 | if (xprt->snd_task == task) { |
350 | xprt_clear_locked(xprt); |
351 | __xprt_lock_write_next(xprt); |
352 | } |
353 | } |
354 | EXPORT_SYMBOL_GPL(xprt_release_xprt); |
355 | |
356 | /** |
357 | * xprt_release_xprt_cong - allow other requests to use a transport |
358 | * @xprt: transport with other tasks potentially waiting |
359 | * @task: task that is releasing access to the transport |
360 | * |
361 | * Note that "task" can be NULL. Another task is awoken to use the |
362 | * transport if the transport's congestion window allows it. |
363 | */ |
364 | void xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task) |
365 | { |
366 | if (xprt->snd_task == task) { |
367 | xprt_clear_locked(xprt); |
368 | __xprt_lock_write_next_cong(xprt); |
369 | } |
370 | } |
371 | EXPORT_SYMBOL_GPL(xprt_release_xprt_cong); |
372 | |
373 | static inline void xprt_release_write(struct rpc_xprt *xprt, struct rpc_task *task) |
374 | { |
375 | spin_lock_bh(&xprt->transport_lock); |
376 | xprt->ops->release_xprt(xprt, task); |
377 | spin_unlock_bh(&xprt->transport_lock); |
378 | } |
379 | |
380 | /* |
381 | * Van Jacobson congestion avoidance. Check if the congestion window |
382 | * overflowed. Put the task to sleep if this is the case. |
383 | */ |
384 | static int |
385 | __xprt_get_cong(struct rpc_xprt *xprt, struct rpc_task *task) |
386 | { |
387 | struct rpc_rqst *req = task->tk_rqstp; |
388 | |
389 | if (req->rq_cong) |
390 | return 1; |
391 | dprintk("RPC: %5u xprt_cwnd_limited cong = %lu cwnd = %lu\n", |
392 | task->tk_pid, xprt->cong, xprt->cwnd); |
393 | if (RPCXPRT_CONGESTED(xprt)) |
394 | return 0; |
395 | req->rq_cong = 1; |
396 | xprt->cong += RPC_CWNDSCALE; |
397 | return 1; |
398 | } |
399 | |
400 | /* |
401 | * Adjust the congestion window, and wake up the next task |
402 | * that has been sleeping due to congestion |
403 | */ |
404 | static void |
405 | __xprt_put_cong(struct rpc_xprt *xprt, struct rpc_rqst *req) |
406 | { |
407 | if (!req->rq_cong) |
408 | return; |
409 | req->rq_cong = 0; |
410 | xprt->cong -= RPC_CWNDSCALE; |
411 | __xprt_lock_write_next_cong(xprt); |
412 | } |
413 | |
414 | /** |
415 | * xprt_release_rqst_cong - housekeeping when request is complete |
416 | * @task: RPC request that recently completed |
417 | * |
418 | * Useful for transports that require congestion control. |
419 | */ |
420 | void xprt_release_rqst_cong(struct rpc_task *task) |
421 | { |
422 | __xprt_put_cong(task->tk_xprt, task->tk_rqstp); |
423 | } |
424 | EXPORT_SYMBOL_GPL(xprt_release_rqst_cong); |
425 | |
426 | /** |
427 | * xprt_adjust_cwnd - adjust transport congestion window |
428 | * @task: recently completed RPC request used to adjust window |
429 | * @result: result code of completed RPC request |
430 | * |
431 | * We use a time-smoothed congestion estimator to avoid heavy oscillation. |
432 | */ |
433 | void xprt_adjust_cwnd(struct rpc_task *task, int result) |
434 | { |
435 | struct rpc_rqst *req = task->tk_rqstp; |
436 | struct rpc_xprt *xprt = task->tk_xprt; |
437 | unsigned long cwnd = xprt->cwnd; |
438 | |
439 | if (result >= 0 && cwnd <= xprt->cong) { |
440 | /* The (cwnd >> 1) term makes sure |
441 | * the result gets rounded properly. */ |
442 | cwnd += (RPC_CWNDSCALE * RPC_CWNDSCALE + (cwnd >> 1)) / cwnd; |
443 | if (cwnd > RPC_MAXCWND(xprt)) |
444 | cwnd = RPC_MAXCWND(xprt); |
445 | __xprt_lock_write_next_cong(xprt); |
446 | } else if (result == -ETIMEDOUT) { |
447 | cwnd >>= 1; |
448 | if (cwnd < RPC_CWNDSCALE) |
449 | cwnd = RPC_CWNDSCALE; |
450 | } |
451 | dprintk("RPC: cong %ld, cwnd was %ld, now %ld\n", |
452 | xprt->cong, xprt->cwnd, cwnd); |
453 | xprt->cwnd = cwnd; |
454 | __xprt_put_cong(xprt, req); |
455 | } |
456 | EXPORT_SYMBOL_GPL(xprt_adjust_cwnd); |
457 | |
458 | /** |
459 | * xprt_wake_pending_tasks - wake all tasks on a transport's pending queue |
460 | * @xprt: transport with waiting tasks |
461 | * @status: result code to plant in each task before waking it |
462 | * |
463 | */ |
464 | void xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status) |
465 | { |
466 | if (status < 0) |
467 | rpc_wake_up_status(&xprt->pending, status); |
468 | else |
469 | rpc_wake_up(&xprt->pending); |
470 | } |
471 | EXPORT_SYMBOL_GPL(xprt_wake_pending_tasks); |
472 | |
473 | /** |
474 | * xprt_wait_for_buffer_space - wait for transport output buffer to clear |
475 | * @task: task to be put to sleep |
476 | * @action: function pointer to be executed after wait |
477 | */ |
478 | void xprt_wait_for_buffer_space(struct rpc_task *task, rpc_action action) |
479 | { |
480 | struct rpc_rqst *req = task->tk_rqstp; |
481 | struct rpc_xprt *xprt = req->rq_xprt; |
482 | |
483 | task->tk_timeout = req->rq_timeout; |
484 | rpc_sleep_on(&xprt->pending, task, action); |
485 | } |
486 | EXPORT_SYMBOL_GPL(xprt_wait_for_buffer_space); |
487 | |
488 | /** |
489 | * xprt_write_space - wake the task waiting for transport output buffer space |
490 | * @xprt: transport with waiting tasks |
491 | * |
492 | * Can be called in a soft IRQ context, so xprt_write_space never sleeps. |
493 | */ |
494 | void xprt_write_space(struct rpc_xprt *xprt) |
495 | { |
496 | if (unlikely(xprt->shutdown)) |
497 | return; |
498 | |
499 | spin_lock_bh(&xprt->transport_lock); |
500 | if (xprt->snd_task) { |
501 | dprintk("RPC: write space: waking waiting task on " |
502 | "xprt %p\n", xprt); |
503 | rpc_wake_up_queued_task(&xprt->pending, xprt->snd_task); |
504 | } |
505 | spin_unlock_bh(&xprt->transport_lock); |
506 | } |
507 | EXPORT_SYMBOL_GPL(xprt_write_space); |
508 | |
509 | /** |
510 | * xprt_set_retrans_timeout_def - set a request's retransmit timeout |
511 | * @task: task whose timeout is to be set |
512 | * |
513 | * Set a request's retransmit timeout based on the transport's |
514 | * default timeout parameters. Used by transports that don't adjust |
515 | * the retransmit timeout based on round-trip time estimation. |
516 | */ |
517 | void xprt_set_retrans_timeout_def(struct rpc_task *task) |
518 | { |
519 | task->tk_timeout = task->tk_rqstp->rq_timeout; |
520 | } |
521 | EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_def); |
522 | |
523 | /* |
524 | * xprt_set_retrans_timeout_rtt - set a request's retransmit timeout |
525 | * @task: task whose timeout is to be set |
526 | * |
527 | * Set a request's retransmit timeout using the RTT estimator. |
528 | */ |
529 | void xprt_set_retrans_timeout_rtt(struct rpc_task *task) |
530 | { |
531 | int timer = task->tk_msg.rpc_proc->p_timer; |
532 | struct rpc_clnt *clnt = task->tk_client; |
533 | struct rpc_rtt *rtt = clnt->cl_rtt; |
534 | struct rpc_rqst *req = task->tk_rqstp; |
535 | unsigned long max_timeout = clnt->cl_timeout->to_maxval; |
536 | |
537 | task->tk_timeout = rpc_calc_rto(rtt, timer); |
538 | task->tk_timeout <<= rpc_ntimeo(rtt, timer) + req->rq_retries; |
539 | if (task->tk_timeout > max_timeout || task->tk_timeout == 0) |
540 | task->tk_timeout = max_timeout; |
541 | } |
542 | EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_rtt); |
543 | |
544 | static void xprt_reset_majortimeo(struct rpc_rqst *req) |
545 | { |
546 | const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout; |
547 | |
548 | req->rq_majortimeo = req->rq_timeout; |
549 | if (to->to_exponential) |
550 | req->rq_majortimeo <<= to->to_retries; |
551 | else |
552 | req->rq_majortimeo += to->to_increment * to->to_retries; |
553 | if (req->rq_majortimeo > to->to_maxval || req->rq_majortimeo == 0) |
554 | req->rq_majortimeo = to->to_maxval; |
555 | req->rq_majortimeo += jiffies; |
556 | } |
557 | |
558 | /** |
559 | * xprt_adjust_timeout - adjust timeout values for next retransmit |
560 | * @req: RPC request containing parameters to use for the adjustment |
561 | * |
562 | */ |
563 | int xprt_adjust_timeout(struct rpc_rqst *req) |
564 | { |
565 | struct rpc_xprt *xprt = req->rq_xprt; |
566 | const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout; |
567 | int status = 0; |
568 | |
569 | if (time_before(jiffies, req->rq_majortimeo)) { |
570 | if (to->to_exponential) |
571 | req->rq_timeout <<= 1; |
572 | else |
573 | req->rq_timeout += to->to_increment; |
574 | if (to->to_maxval && req->rq_timeout >= to->to_maxval) |
575 | req->rq_timeout = to->to_maxval; |
576 | req->rq_retries++; |
577 | } else { |
578 | req->rq_timeout = to->to_initval; |
579 | req->rq_retries = 0; |
580 | xprt_reset_majortimeo(req); |
581 | /* Reset the RTT counters == "slow start" */ |
582 | spin_lock_bh(&xprt->transport_lock); |
583 | rpc_init_rtt(req->rq_task->tk_client->cl_rtt, to->to_initval); |
584 | spin_unlock_bh(&xprt->transport_lock); |
585 | status = -ETIMEDOUT; |
586 | } |
587 | |
588 | if (req->rq_timeout == 0) { |
589 | printk(KERN_WARNING "xprt_adjust_timeout: rq_timeout = 0!\n"); |
590 | req->rq_timeout = 5 * HZ; |
591 | } |
592 | return status; |
593 | } |
594 | |
595 | static void xprt_autoclose(struct work_struct *work) |
596 | { |
597 | struct rpc_xprt *xprt = |
598 | container_of(work, struct rpc_xprt, task_cleanup); |
599 | |
600 | xprt->ops->close(xprt); |
601 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
602 | xprt_release_write(xprt, NULL); |
603 | } |
604 | |
605 | /** |
606 | * xprt_disconnect_done - mark a transport as disconnected |
607 | * @xprt: transport to flag for disconnect |
608 | * |
609 | */ |
610 | void xprt_disconnect_done(struct rpc_xprt *xprt) |
611 | { |
612 | dprintk("RPC: disconnected transport %p\n", xprt); |
613 | spin_lock_bh(&xprt->transport_lock); |
614 | xprt_clear_connected(xprt); |
615 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
616 | spin_unlock_bh(&xprt->transport_lock); |
617 | } |
618 | EXPORT_SYMBOL_GPL(xprt_disconnect_done); |
619 | |
620 | /** |
621 | * xprt_force_disconnect - force a transport to disconnect |
622 | * @xprt: transport to disconnect |
623 | * |
624 | */ |
625 | void xprt_force_disconnect(struct rpc_xprt *xprt) |
626 | { |
627 | /* Don't race with the test_bit() in xprt_clear_locked() */ |
628 | spin_lock_bh(&xprt->transport_lock); |
629 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); |
630 | /* Try to schedule an autoclose RPC call */ |
631 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) |
632 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
633 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
634 | spin_unlock_bh(&xprt->transport_lock); |
635 | } |
636 | |
637 | /** |
638 | * xprt_conditional_disconnect - force a transport to disconnect |
639 | * @xprt: transport to disconnect |
640 | * @cookie: 'connection cookie' |
641 | * |
642 | * This attempts to break the connection if and only if 'cookie' matches |
643 | * the current transport 'connection cookie'. It ensures that we don't |
644 | * try to break the connection more than once when we need to retransmit |
645 | * a batch of RPC requests. |
646 | * |
647 | */ |
648 | void xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie) |
649 | { |
650 | /* Don't race with the test_bit() in xprt_clear_locked() */ |
651 | spin_lock_bh(&xprt->transport_lock); |
652 | if (cookie != xprt->connect_cookie) |
653 | goto out; |
654 | if (test_bit(XPRT_CLOSING, &xprt->state) || !xprt_connected(xprt)) |
655 | goto out; |
656 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); |
657 | /* Try to schedule an autoclose RPC call */ |
658 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) |
659 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
660 | xprt_wake_pending_tasks(xprt, -EAGAIN); |
661 | out: |
662 | spin_unlock_bh(&xprt->transport_lock); |
663 | } |
664 | |
665 | static void |
666 | xprt_init_autodisconnect(unsigned long data) |
667 | { |
668 | struct rpc_xprt *xprt = (struct rpc_xprt *)data; |
669 | |
670 | spin_lock(&xprt->transport_lock); |
671 | if (!list_empty(&xprt->recv) || xprt->shutdown) |
672 | goto out_abort; |
673 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) |
674 | goto out_abort; |
675 | spin_unlock(&xprt->transport_lock); |
676 | set_bit(XPRT_CONNECTION_CLOSE, &xprt->state); |
677 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
678 | return; |
679 | out_abort: |
680 | spin_unlock(&xprt->transport_lock); |
681 | } |
682 | |
683 | /** |
684 | * xprt_connect - schedule a transport connect operation |
685 | * @task: RPC task that is requesting the connect |
686 | * |
687 | */ |
688 | void xprt_connect(struct rpc_task *task) |
689 | { |
690 | struct rpc_xprt *xprt = task->tk_xprt; |
691 | |
692 | dprintk("RPC: %5u xprt_connect xprt %p %s connected\n", task->tk_pid, |
693 | xprt, (xprt_connected(xprt) ? "is" : "is not")); |
694 | |
695 | if (!xprt_bound(xprt)) { |
696 | task->tk_status = -EAGAIN; |
697 | return; |
698 | } |
699 | if (!xprt_lock_write(xprt, task)) |
700 | return; |
701 | |
702 | if (test_and_clear_bit(XPRT_CLOSE_WAIT, &xprt->state)) |
703 | xprt->ops->close(xprt); |
704 | |
705 | if (xprt_connected(xprt)) |
706 | xprt_release_write(xprt, task); |
707 | else { |
708 | if (task->tk_rqstp) |
709 | task->tk_rqstp->rq_bytes_sent = 0; |
710 | |
711 | task->tk_timeout = task->tk_rqstp->rq_timeout; |
712 | rpc_sleep_on(&xprt->pending, task, xprt_connect_status); |
713 | |
714 | if (test_bit(XPRT_CLOSING, &xprt->state)) |
715 | return; |
716 | if (xprt_test_and_set_connecting(xprt)) |
717 | return; |
718 | xprt->stat.connect_start = jiffies; |
719 | xprt->ops->connect(task); |
720 | } |
721 | } |
722 | |
723 | static void xprt_connect_status(struct rpc_task *task) |
724 | { |
725 | struct rpc_xprt *xprt = task->tk_xprt; |
726 | |
727 | if (task->tk_status == 0) { |
728 | xprt->stat.connect_count++; |
729 | xprt->stat.connect_time += (long)jiffies - xprt->stat.connect_start; |
730 | dprintk("RPC: %5u xprt_connect_status: connection established\n", |
731 | task->tk_pid); |
732 | return; |
733 | } |
734 | |
735 | switch (task->tk_status) { |
736 | case -EAGAIN: |
737 | dprintk("RPC: %5u xprt_connect_status: retrying\n", task->tk_pid); |
738 | break; |
739 | case -ETIMEDOUT: |
740 | dprintk("RPC: %5u xprt_connect_status: connect attempt timed " |
741 | "out\n", task->tk_pid); |
742 | break; |
743 | default: |
744 | dprintk("RPC: %5u xprt_connect_status: error %d connecting to " |
745 | "server %s\n", task->tk_pid, -task->tk_status, |
746 | task->tk_client->cl_server); |
747 | xprt_release_write(xprt, task); |
748 | task->tk_status = -EIO; |
749 | } |
750 | } |
751 | |
752 | /** |
753 | * xprt_lookup_rqst - find an RPC request corresponding to an XID |
754 | * @xprt: transport on which the original request was transmitted |
755 | * @xid: RPC XID of incoming reply |
756 | * |
757 | */ |
758 | struct rpc_rqst *xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid) |
759 | { |
760 | struct list_head *pos; |
761 | |
762 | list_for_each(pos, &xprt->recv) { |
763 | struct rpc_rqst *entry = list_entry(pos, struct rpc_rqst, rq_list); |
764 | if (entry->rq_xid == xid) |
765 | return entry; |
766 | } |
767 | |
768 | dprintk("RPC: xprt_lookup_rqst did not find xid %08x\n", |
769 | ntohl(xid)); |
770 | xprt->stat.bad_xids++; |
771 | return NULL; |
772 | } |
773 | EXPORT_SYMBOL_GPL(xprt_lookup_rqst); |
774 | |
775 | static void xprt_update_rtt(struct rpc_task *task) |
776 | { |
777 | struct rpc_rqst *req = task->tk_rqstp; |
778 | struct rpc_rtt *rtt = task->tk_client->cl_rtt; |
779 | unsigned timer = task->tk_msg.rpc_proc->p_timer; |
780 | long m = usecs_to_jiffies(ktime_to_us(req->rq_rtt)); |
781 | |
782 | if (timer) { |
783 | if (req->rq_ntrans == 1) |
784 | rpc_update_rtt(rtt, timer, m); |
785 | rpc_set_timeo(rtt, timer, req->rq_ntrans - 1); |
786 | } |
787 | } |
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 | req->rq_rtt = ktime_sub(ktime_get(), req->rq_xtime); |
806 | if (xprt->ops->timer != NULL) |
807 | xprt_update_rtt(task); |
808 | |
809 | list_del_init(&req->rq_list); |
810 | req->rq_private_buf.len = copied; |
811 | /* Ensure all writes are done before we update */ |
812 | /* req->rq_reply_bytes_recvd */ |
813 | smp_wmb(); |
814 | req->rq_reply_bytes_recvd = copied; |
815 | rpc_wake_up_queued_task(&xprt->pending, task); |
816 | } |
817 | EXPORT_SYMBOL_GPL(xprt_complete_rqst); |
818 | |
819 | static void xprt_timer(struct rpc_task *task) |
820 | { |
821 | struct rpc_rqst *req = task->tk_rqstp; |
822 | struct rpc_xprt *xprt = req->rq_xprt; |
823 | |
824 | if (task->tk_status != -ETIMEDOUT) |
825 | return; |
826 | dprintk("RPC: %5u xprt_timer\n", task->tk_pid); |
827 | |
828 | spin_lock_bh(&xprt->transport_lock); |
829 | if (!req->rq_reply_bytes_recvd) { |
830 | if (xprt->ops->timer) |
831 | xprt->ops->timer(task); |
832 | } else |
833 | task->tk_status = 0; |
834 | spin_unlock_bh(&xprt->transport_lock); |
835 | } |
836 | |
837 | static inline int xprt_has_timer(struct rpc_xprt *xprt) |
838 | { |
839 | return xprt->idle_timeout != 0; |
840 | } |
841 | |
842 | /** |
843 | * xprt_prepare_transmit - reserve the transport before sending a request |
844 | * @task: RPC task about to send a request |
845 | * |
846 | */ |
847 | int xprt_prepare_transmit(struct rpc_task *task) |
848 | { |
849 | struct rpc_rqst *req = task->tk_rqstp; |
850 | struct rpc_xprt *xprt = req->rq_xprt; |
851 | int err = 0; |
852 | |
853 | dprintk("RPC: %5u xprt_prepare_transmit\n", task->tk_pid); |
854 | |
855 | spin_lock_bh(&xprt->transport_lock); |
856 | if (req->rq_reply_bytes_recvd && !req->rq_bytes_sent) { |
857 | err = req->rq_reply_bytes_recvd; |
858 | goto out_unlock; |
859 | } |
860 | if (!xprt->ops->reserve_xprt(task)) |
861 | err = -EAGAIN; |
862 | out_unlock: |
863 | spin_unlock_bh(&xprt->transport_lock); |
864 | return err; |
865 | } |
866 | |
867 | void xprt_end_transmit(struct rpc_task *task) |
868 | { |
869 | xprt_release_write(task->tk_rqstp->rq_xprt, task); |
870 | } |
871 | |
872 | /** |
873 | * xprt_transmit - send an RPC request on a transport |
874 | * @task: controlling RPC task |
875 | * |
876 | * We have to copy the iovec because sendmsg fiddles with its contents. |
877 | */ |
878 | void xprt_transmit(struct rpc_task *task) |
879 | { |
880 | struct rpc_rqst *req = task->tk_rqstp; |
881 | struct rpc_xprt *xprt = req->rq_xprt; |
882 | int status; |
883 | |
884 | dprintk("RPC: %5u xprt_transmit(%u)\n", task->tk_pid, req->rq_slen); |
885 | |
886 | if (!req->rq_reply_bytes_recvd) { |
887 | if (list_empty(&req->rq_list) && rpc_reply_expected(task)) { |
888 | /* |
889 | * Add to the list only if we're expecting a reply |
890 | */ |
891 | spin_lock_bh(&xprt->transport_lock); |
892 | /* Update the softirq receive buffer */ |
893 | memcpy(&req->rq_private_buf, &req->rq_rcv_buf, |
894 | sizeof(req->rq_private_buf)); |
895 | /* Add request to the receive list */ |
896 | list_add_tail(&req->rq_list, &xprt->recv); |
897 | spin_unlock_bh(&xprt->transport_lock); |
898 | xprt_reset_majortimeo(req); |
899 | /* Turn off autodisconnect */ |
900 | del_singleshot_timer_sync(&xprt->timer); |
901 | } |
902 | } else if (!req->rq_bytes_sent) |
903 | return; |
904 | |
905 | req->rq_connect_cookie = xprt->connect_cookie; |
906 | req->rq_xtime = ktime_get(); |
907 | status = xprt->ops->send_request(task); |
908 | if (status != 0) { |
909 | task->tk_status = status; |
910 | return; |
911 | } |
912 | |
913 | dprintk("RPC: %5u xmit complete\n", task->tk_pid); |
914 | spin_lock_bh(&xprt->transport_lock); |
915 | |
916 | xprt->ops->set_retrans_timeout(task); |
917 | |
918 | xprt->stat.sends++; |
919 | xprt->stat.req_u += xprt->stat.sends - xprt->stat.recvs; |
920 | xprt->stat.bklog_u += xprt->backlog.qlen; |
921 | |
922 | /* Don't race with disconnect */ |
923 | if (!xprt_connected(xprt)) |
924 | task->tk_status = -ENOTCONN; |
925 | else if (!req->rq_reply_bytes_recvd && rpc_reply_expected(task)) { |
926 | /* |
927 | * Sleep on the pending queue since |
928 | * we're expecting a reply. |
929 | */ |
930 | rpc_sleep_on(&xprt->pending, task, xprt_timer); |
931 | } |
932 | spin_unlock_bh(&xprt->transport_lock); |
933 | } |
934 | |
935 | static void xprt_alloc_slot(struct rpc_task *task) |
936 | { |
937 | struct rpc_xprt *xprt = task->tk_xprt; |
938 | |
939 | task->tk_status = 0; |
940 | if (task->tk_rqstp) |
941 | return; |
942 | if (!list_empty(&xprt->free)) { |
943 | struct rpc_rqst *req = list_entry(xprt->free.next, struct rpc_rqst, rq_list); |
944 | list_del_init(&req->rq_list); |
945 | task->tk_rqstp = req; |
946 | xprt_request_init(task, xprt); |
947 | return; |
948 | } |
949 | dprintk("RPC: waiting for request slot\n"); |
950 | task->tk_status = -EAGAIN; |
951 | task->tk_timeout = 0; |
952 | rpc_sleep_on(&xprt->backlog, task, NULL); |
953 | } |
954 | |
955 | static void xprt_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *req) |
956 | { |
957 | memset(req, 0, sizeof(*req)); /* mark unused */ |
958 | |
959 | spin_lock(&xprt->reserve_lock); |
960 | list_add(&req->rq_list, &xprt->free); |
961 | rpc_wake_up_next(&xprt->backlog); |
962 | spin_unlock(&xprt->reserve_lock); |
963 | } |
964 | |
965 | /** |
966 | * xprt_reserve - allocate an RPC request slot |
967 | * @task: RPC task requesting a slot allocation |
968 | * |
969 | * If no more slots are available, place the task on the transport's |
970 | * backlog queue. |
971 | */ |
972 | void xprt_reserve(struct rpc_task *task) |
973 | { |
974 | struct rpc_xprt *xprt = task->tk_xprt; |
975 | |
976 | task->tk_status = -EIO; |
977 | spin_lock(&xprt->reserve_lock); |
978 | xprt_alloc_slot(task); |
979 | spin_unlock(&xprt->reserve_lock); |
980 | } |
981 | |
982 | static inline __be32 xprt_alloc_xid(struct rpc_xprt *xprt) |
983 | { |
984 | return (__force __be32)xprt->xid++; |
985 | } |
986 | |
987 | static inline void xprt_init_xid(struct rpc_xprt *xprt) |
988 | { |
989 | xprt->xid = net_random(); |
990 | } |
991 | |
992 | static void xprt_request_init(struct rpc_task *task, struct rpc_xprt *xprt) |
993 | { |
994 | struct rpc_rqst *req = task->tk_rqstp; |
995 | |
996 | req->rq_timeout = task->tk_client->cl_timeout->to_initval; |
997 | req->rq_task = task; |
998 | req->rq_xprt = xprt; |
999 | req->rq_buffer = NULL; |
1000 | req->rq_xid = xprt_alloc_xid(xprt); |
1001 | req->rq_release_snd_buf = NULL; |
1002 | xprt_reset_majortimeo(req); |
1003 | dprintk("RPC: %5u reserved req %p xid %08x\n", task->tk_pid, |
1004 | req, ntohl(req->rq_xid)); |
1005 | } |
1006 | |
1007 | /** |
1008 | * xprt_release - release an RPC request slot |
1009 | * @task: task which is finished with the slot |
1010 | * |
1011 | */ |
1012 | void xprt_release(struct rpc_task *task) |
1013 | { |
1014 | struct rpc_xprt *xprt; |
1015 | struct rpc_rqst *req; |
1016 | |
1017 | if (!(req = task->tk_rqstp)) |
1018 | return; |
1019 | |
1020 | xprt = req->rq_xprt; |
1021 | rpc_count_iostats(task); |
1022 | spin_lock_bh(&xprt->transport_lock); |
1023 | xprt->ops->release_xprt(xprt, task); |
1024 | if (xprt->ops->release_request) |
1025 | xprt->ops->release_request(task); |
1026 | if (!list_empty(&req->rq_list)) |
1027 | list_del(&req->rq_list); |
1028 | xprt->last_used = jiffies; |
1029 | if (list_empty(&xprt->recv) && xprt_has_timer(xprt)) |
1030 | mod_timer(&xprt->timer, |
1031 | xprt->last_used + xprt->idle_timeout); |
1032 | spin_unlock_bh(&xprt->transport_lock); |
1033 | if (req->rq_buffer) |
1034 | xprt->ops->buf_free(req->rq_buffer); |
1035 | if (req->rq_cred != NULL) |
1036 | put_rpccred(req->rq_cred); |
1037 | task->tk_rqstp = NULL; |
1038 | if (req->rq_release_snd_buf) |
1039 | req->rq_release_snd_buf(req); |
1040 | |
1041 | dprintk("RPC: %5u release request %p\n", task->tk_pid, req); |
1042 | if (likely(!bc_prealloc(req))) |
1043 | xprt_free_slot(xprt, req); |
1044 | else |
1045 | xprt_free_bc_request(req); |
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 | cancel_work_sync(&xprt->task_cleanup); |
1135 | /* |
1136 | * Tear down transport state and free the rpc_xprt |
1137 | */ |
1138 | xprt->ops->destroy(xprt); |
1139 | } |
1140 | |
1141 | /** |
1142 | * xprt_put - release a reference to an RPC transport. |
1143 | * @xprt: pointer to the transport |
1144 | * |
1145 | */ |
1146 | void xprt_put(struct rpc_xprt *xprt) |
1147 | { |
1148 | kref_put(&xprt->kref, xprt_destroy); |
1149 | } |
1150 | |
1151 | /** |
1152 | * xprt_get - return a reference to an RPC transport. |
1153 | * @xprt: pointer to the transport |
1154 | * |
1155 | */ |
1156 | struct rpc_xprt *xprt_get(struct rpc_xprt *xprt) |
1157 | { |
1158 | kref_get(&xprt->kref); |
1159 | return xprt; |
1160 | } |
1161 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
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jz-3.1
jz-3.11
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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