Lines Matching +full:rpc +full:- +full:if
1 // SPDX-License-Identifier: GPL-2.0-only
5 * This is a generic RPC call interface supporting congestion avoidance,
10 * - When a process places a call, it allocates a request slot if
13 * - Next, the caller puts together the RPC message, stuffs it into
15 * - xprt_transmit sends the message and installs the caller on the
16 * transport's wait list. At the same time, if a reply is expected,
19 * - When a packet arrives, the data_ready handler walks the list of
20 * pending requests for that transport. If a matching XID is found, the
22 * - When no reply arrives within the timeout interval, the timer is
25 * of -ETIMEDOUT.
26 * - When the caller receives a notification from RPC that a reply arrived,
27 * it should release the RPC slot, and process the reply.
28 * If the call timed out, it may choose to retry the operation by
32 * Support for async RPC is done through a set of RPC-specific scheduling
36 * Copyright (C) 1995-1997, Olaf Kirch <okir@monad.swb.de>
63 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
80 unsigned long timeout = jiffies + req->rq_timeout; in xprt_request_timeout()
82 if (time_before(timeout, req->rq_majortimeo)) in xprt_request_timeout()
84 return req->rq_majortimeo; in xprt_request_timeout()
88 * xprt_register_transport - register a transport implementation
91 * If a transport implementation is loaded as a kernel module, it can
92 * call this interface to make itself known to the RPC client.
96 * -EEXIST: transport already registered
97 * -EINVAL: transport module being unloaded
104 result = -EEXIST; in xprt_register_transport()
108 if (t->ident == transport->ident) in xprt_register_transport()
112 list_add_tail(&transport->list, &xprt_list); in xprt_register_transport()
113 printk(KERN_INFO "RPC: Registered %s transport module.\n", in xprt_register_transport()
114 transport->name); in xprt_register_transport()
124 * xprt_unregister_transport - unregister a transport implementation
129 * -ENOENT: transport never registered
139 if (t == transport) { in xprt_unregister_transport()
141 "RPC: Unregistered %s transport module.\n", in xprt_unregister_transport()
142 transport->name); in xprt_unregister_transport()
143 list_del_init(&transport->list); in xprt_unregister_transport()
147 result = -ENOENT; in xprt_unregister_transport()
158 module_put(t->owner); in xprt_class_release()
168 for (i = 0; t->netid[i][0] != '\0'; i++) { in xprt_class_find_by_netid_locked()
169 if (strcmp(t->netid[i], netid) != 0) in xprt_class_find_by_netid_locked()
171 if (!try_module_get(t->owner)) in xprt_class_find_by_netid_locked()
186 if (!t) { in xprt_class_find_by_netid()
188 request_module("rpc%s", netid); in xprt_class_find_by_netid()
197 * xprt_load_transport - load a transport implementation
202 * -ENOENT: transport module not available
209 if (!t) in xprt_load_transport()
210 return -ENOENT; in xprt_load_transport()
218 xprt->snd_task = NULL; in xprt_clear_locked()
219 if (!test_bit(XPRT_CLOSE_WAIT, &xprt->state)) { in xprt_clear_locked()
221 clear_bit(XPRT_LOCKED, &xprt->state); in xprt_clear_locked()
224 queue_work(xprtiod_workqueue, &xprt->task_cleanup); in xprt_clear_locked()
228 * xprt_reserve_xprt - serialize write access to transports
238 struct rpc_rqst *req = task->tk_rqstp; in xprt_reserve_xprt()
240 if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { in xprt_reserve_xprt()
241 if (task == xprt->snd_task) in xprt_reserve_xprt()
245 if (test_bit(XPRT_WRITE_SPACE, &xprt->state)) in xprt_reserve_xprt()
247 xprt->snd_task = task; in xprt_reserve_xprt()
256 task->tk_status = -EAGAIN; in xprt_reserve_xprt()
257 if (RPC_IS_SOFT(task)) in xprt_reserve_xprt()
258 rpc_sleep_on_timeout(&xprt->sending, task, NULL, in xprt_reserve_xprt()
261 rpc_sleep_on(&xprt->sending, task, NULL); in xprt_reserve_xprt()
269 return test_bit(XPRT_CWND_WAIT, &xprt->state); in xprt_need_congestion_window_wait()
275 if (!list_empty(&xprt->xmit_queue)) { in xprt_set_congestion_window_wait()
276 /* Peek at head of queue to see if it can make progress */ in xprt_set_congestion_window_wait()
277 if (list_first_entry(&xprt->xmit_queue, struct rpc_rqst, in xprt_set_congestion_window_wait()
278 rq_xmit)->rq_cong) in xprt_set_congestion_window_wait()
281 set_bit(XPRT_CWND_WAIT, &xprt->state); in xprt_set_congestion_window_wait()
287 if (!RPCXPRT_CONGESTED(xprt)) in xprt_test_and_clear_congestion_window_wait()
288 clear_bit(XPRT_CWND_WAIT, &xprt->state); in xprt_test_and_clear_congestion_window_wait()
292 * xprt_reserve_xprt_cong - serialize write access to transports
298 * Note that the lock is only granted if we know there are free slots.
302 struct rpc_rqst *req = task->tk_rqstp; in xprt_reserve_xprt_cong()
304 if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { in xprt_reserve_xprt_cong()
305 if (task == xprt->snd_task) in xprt_reserve_xprt_cong()
309 if (req == NULL) { in xprt_reserve_xprt_cong()
310 xprt->snd_task = task; in xprt_reserve_xprt_cong()
313 if (test_bit(XPRT_WRITE_SPACE, &xprt->state)) in xprt_reserve_xprt_cong()
315 if (!xprt_need_congestion_window_wait(xprt)) { in xprt_reserve_xprt_cong()
316 xprt->snd_task = task; in xprt_reserve_xprt_cong()
322 task->tk_status = -EAGAIN; in xprt_reserve_xprt_cong()
323 if (RPC_IS_SOFT(task)) in xprt_reserve_xprt_cong()
324 rpc_sleep_on_timeout(&xprt->sending, task, NULL, in xprt_reserve_xprt_cong()
327 rpc_sleep_on(&xprt->sending, task, NULL); in xprt_reserve_xprt_cong()
339 if (test_bit(XPRT_LOCKED, &xprt->state) && xprt->snd_task == task) in xprt_lock_write()
341 spin_lock(&xprt->transport_lock); in xprt_lock_write()
342 retval = xprt->ops->reserve_xprt(xprt, task); in xprt_lock_write()
343 spin_unlock(&xprt->transport_lock); in xprt_lock_write()
351 xprt->snd_task = task; in __xprt_lock_write_func()
357 if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) in __xprt_lock_write_next()
359 if (test_bit(XPRT_WRITE_SPACE, &xprt->state)) in __xprt_lock_write_next()
361 if (rpc_wake_up_first_on_wq(xprtiod_workqueue, &xprt->sending, in __xprt_lock_write_next()
370 if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) in __xprt_lock_write_next_cong()
372 if (test_bit(XPRT_WRITE_SPACE, &xprt->state)) in __xprt_lock_write_next_cong()
374 if (xprt_need_congestion_window_wait(xprt)) in __xprt_lock_write_next_cong()
376 if (rpc_wake_up_first_on_wq(xprtiod_workqueue, &xprt->sending, in __xprt_lock_write_next_cong()
384 * xprt_release_xprt - allow other requests to use a transport
392 if (xprt->snd_task == task) { in xprt_release_xprt()
401 * xprt_release_xprt_cong - allow other requests to use a transport
406 * transport if the transport's congestion window allows it.
410 if (xprt->snd_task == task) { in xprt_release_xprt_cong()
420 if (xprt->snd_task != task) in xprt_release_write()
422 spin_lock(&xprt->transport_lock); in xprt_release_write()
423 xprt->ops->release_xprt(xprt, task); in xprt_release_write()
424 spin_unlock(&xprt->transport_lock); in xprt_release_write()
428 * Van Jacobson congestion avoidance. Check if the congestion window
429 * overflowed. Put the task to sleep if this is the case.
434 if (req->rq_cong) in __xprt_get_cong()
436 trace_xprt_get_cong(xprt, req->rq_task); in __xprt_get_cong()
437 if (RPCXPRT_CONGESTED(xprt)) { in __xprt_get_cong()
441 req->rq_cong = 1; in __xprt_get_cong()
442 xprt->cong += RPC_CWNDSCALE; in __xprt_get_cong()
453 if (!req->rq_cong) in __xprt_put_cong()
455 req->rq_cong = 0; in __xprt_put_cong()
456 xprt->cong -= RPC_CWNDSCALE; in __xprt_put_cong()
458 trace_xprt_put_cong(xprt, req->rq_task); in __xprt_put_cong()
463 * xprt_request_get_cong - Request congestion control credits
465 * @req: pointer to RPC request
474 if (req->rq_cong) in xprt_request_get_cong()
476 spin_lock(&xprt->transport_lock); in xprt_request_get_cong()
478 spin_unlock(&xprt->transport_lock); in xprt_request_get_cong()
484 * xprt_release_rqst_cong - housekeeping when request is complete
485 * @task: RPC request that recently completed
491 struct rpc_rqst *req = task->tk_rqstp; in xprt_release_rqst_cong()
493 __xprt_put_cong(req->rq_xprt, req); in xprt_release_rqst_cong()
499 if (test_and_clear_bit(XPRT_CWND_WAIT, &xprt->state)) in xprt_clear_congestion_window_wait_locked()
505 * entry on xprt->sending
510 if (test_and_clear_bit(XPRT_CWND_WAIT, &xprt->state)) { in xprt_clear_congestion_window_wait()
511 spin_lock(&xprt->transport_lock); in xprt_clear_congestion_window_wait()
513 spin_unlock(&xprt->transport_lock); in xprt_clear_congestion_window_wait()
518 * xprt_adjust_cwnd - adjust transport congestion window
520 * @task: recently completed RPC request used to adjust window
521 * @result: result code of completed RPC request
523 * The transport code maintains an estimate on the maximum number of out-
524 * standing RPC requests, using a smoothed version of the congestion
526 * congestion algorithm: If a retransmit occurs, the congestion window is
529 * - a reply is received and
530 * - a full number of requests are outstanding and
531 * - the congestion window hasn't been updated recently.
535 struct rpc_rqst *req = task->tk_rqstp; in xprt_adjust_cwnd()
536 unsigned long cwnd = xprt->cwnd; in xprt_adjust_cwnd()
538 if (result >= 0 && cwnd <= xprt->cong) { in xprt_adjust_cwnd()
542 if (cwnd > RPC_MAXCWND(xprt)) in xprt_adjust_cwnd()
545 } else if (result == -ETIMEDOUT) { in xprt_adjust_cwnd()
547 if (cwnd < RPC_CWNDSCALE) in xprt_adjust_cwnd()
550 dprintk("RPC: cong %ld, cwnd was %ld, now %ld\n", in xprt_adjust_cwnd()
551 xprt->cong, xprt->cwnd, cwnd); in xprt_adjust_cwnd()
552 xprt->cwnd = cwnd; in xprt_adjust_cwnd()
558 * xprt_wake_pending_tasks - wake all tasks on a transport's pending queue
565 if (status < 0) in xprt_wake_pending_tasks()
566 rpc_wake_up_status(&xprt->pending, status); in xprt_wake_pending_tasks()
568 rpc_wake_up(&xprt->pending); in xprt_wake_pending_tasks()
573 * xprt_wait_for_buffer_space - wait for transport output buffer to clear
578 * an incomplete RPC call transmission.
582 set_bit(XPRT_WRITE_SPACE, &xprt->state); in xprt_wait_for_buffer_space()
589 if (test_and_clear_bit(XPRT_WRITE_SPACE, &xprt->state)) { in xprt_clear_write_space_locked()
591 dprintk("RPC: write space: waking waiting task on " in xprt_clear_write_space_locked()
599 * xprt_write_space - wake the task waiting for transport output buffer space
608 if (!test_bit(XPRT_WRITE_SPACE, &xprt->state)) in xprt_write_space()
610 spin_lock(&xprt->transport_lock); in xprt_write_space()
612 spin_unlock(&xprt->transport_lock); in xprt_write_space()
619 s64 delta = ktime_to_ns(ktime_get() - abstime); in xprt_abs_ktime_to_jiffies()
621 jiffies - nsecs_to_jiffies(delta) : in xprt_abs_ktime_to_jiffies()
622 jiffies + nsecs_to_jiffies(-delta); in xprt_abs_ktime_to_jiffies()
627 const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout; in xprt_calc_majortimeo()
628 unsigned long majortimeo = req->rq_timeout; in xprt_calc_majortimeo()
630 if (to->to_exponential) in xprt_calc_majortimeo()
631 majortimeo <<= to->to_retries; in xprt_calc_majortimeo()
633 majortimeo += to->to_increment * to->to_retries; in xprt_calc_majortimeo()
634 if (majortimeo > to->to_maxval || majortimeo == 0) in xprt_calc_majortimeo()
635 majortimeo = to->to_maxval; in xprt_calc_majortimeo()
641 req->rq_majortimeo += xprt_calc_majortimeo(req); in xprt_reset_majortimeo()
646 req->rq_minortimeo += req->rq_timeout; in xprt_reset_minortimeo()
652 struct rpc_xprt *xprt = req->rq_xprt; in xprt_init_majortimeo()
654 if (likely(xprt && xprt_connected(xprt))) in xprt_init_majortimeo()
657 time_init = xprt_abs_ktime_to_jiffies(task->tk_start); in xprt_init_majortimeo()
658 req->rq_timeout = task->tk_client->cl_timeout->to_initval; in xprt_init_majortimeo()
659 req->rq_majortimeo = time_init + xprt_calc_majortimeo(req); in xprt_init_majortimeo()
660 req->rq_minortimeo = time_init + req->rq_timeout; in xprt_init_majortimeo()
664 * xprt_adjust_timeout - adjust timeout values for next retransmit
665 * @req: RPC request containing parameters to use for the adjustment
670 struct rpc_xprt *xprt = req->rq_xprt; in xprt_adjust_timeout()
671 const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout; in xprt_adjust_timeout()
674 if (time_before(jiffies, req->rq_majortimeo)) { in xprt_adjust_timeout()
675 if (time_before(jiffies, req->rq_minortimeo)) in xprt_adjust_timeout()
677 if (to->to_exponential) in xprt_adjust_timeout()
678 req->rq_timeout <<= 1; in xprt_adjust_timeout()
680 req->rq_timeout += to->to_increment; in xprt_adjust_timeout()
681 if (to->to_maxval && req->rq_timeout >= to->to_maxval) in xprt_adjust_timeout()
682 req->rq_timeout = to->to_maxval; in xprt_adjust_timeout()
683 req->rq_retries++; in xprt_adjust_timeout()
685 req->rq_timeout = to->to_initval; in xprt_adjust_timeout()
686 req->rq_retries = 0; in xprt_adjust_timeout()
689 spin_lock(&xprt->transport_lock); in xprt_adjust_timeout()
690 rpc_init_rtt(req->rq_task->tk_client->cl_rtt, to->to_initval); in xprt_adjust_timeout()
691 spin_unlock(&xprt->transport_lock); in xprt_adjust_timeout()
692 status = -ETIMEDOUT; in xprt_adjust_timeout()
696 if (req->rq_timeout == 0) { in xprt_adjust_timeout()
698 req->rq_timeout = 5 * HZ; in xprt_adjust_timeout()
710 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); in xprt_autoclose()
711 xprt->ops->close(xprt); in xprt_autoclose()
713 wake_up_bit(&xprt->state, XPRT_LOCKED); in xprt_autoclose()
718 * xprt_disconnect_done - mark a transport as disconnected
725 spin_lock(&xprt->transport_lock); in xprt_disconnect_done()
729 xprt_wake_pending_tasks(xprt, -ENOTCONN); in xprt_disconnect_done()
730 spin_unlock(&xprt->transport_lock); in xprt_disconnect_done()
735 * xprt_force_disconnect - force a transport to disconnect
744 spin_lock(&xprt->transport_lock); in xprt_force_disconnect()
745 set_bit(XPRT_CLOSE_WAIT, &xprt->state); in xprt_force_disconnect()
746 /* Try to schedule an autoclose RPC call */ in xprt_force_disconnect()
747 if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) in xprt_force_disconnect()
748 queue_work(xprtiod_workqueue, &xprt->task_cleanup); in xprt_force_disconnect()
749 else if (xprt->snd_task && !test_bit(XPRT_SND_IS_COOKIE, &xprt->state)) in xprt_force_disconnect()
750 rpc_wake_up_queued_task_set_status(&xprt->pending, in xprt_force_disconnect()
751 xprt->snd_task, -ENOTCONN); in xprt_force_disconnect()
752 spin_unlock(&xprt->transport_lock); in xprt_force_disconnect()
759 return READ_ONCE(xprt->connect_cookie); in xprt_connect_cookie()
765 struct rpc_rqst *req = task->tk_rqstp; in xprt_request_retransmit_after_disconnect()
766 struct rpc_xprt *xprt = req->rq_xprt; in xprt_request_retransmit_after_disconnect()
768 return req->rq_connect_cookie != xprt_connect_cookie(xprt) || in xprt_request_retransmit_after_disconnect()
773 * xprt_conditional_disconnect - force a transport to disconnect
777 * This attempts to break the connection if and only if 'cookie' matches
780 * a batch of RPC requests.
786 spin_lock(&xprt->transport_lock); in xprt_conditional_disconnect()
787 if (cookie != xprt->connect_cookie) in xprt_conditional_disconnect()
789 if (test_bit(XPRT_CLOSING, &xprt->state)) in xprt_conditional_disconnect()
791 set_bit(XPRT_CLOSE_WAIT, &xprt->state); in xprt_conditional_disconnect()
792 /* Try to schedule an autoclose RPC call */ in xprt_conditional_disconnect()
793 if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) in xprt_conditional_disconnect()
794 queue_work(xprtiod_workqueue, &xprt->task_cleanup); in xprt_conditional_disconnect()
795 xprt_wake_pending_tasks(xprt, -EAGAIN); in xprt_conditional_disconnect()
797 spin_unlock(&xprt->transport_lock); in xprt_conditional_disconnect()
803 return xprt->idle_timeout != 0; in xprt_has_timer()
808 __must_hold(&xprt->transport_lock) in xprt_schedule_autodisconnect()
810 xprt->last_used = jiffies; in xprt_schedule_autodisconnect()
811 if (RB_EMPTY_ROOT(&xprt->recv_queue) && xprt_has_timer(xprt)) in xprt_schedule_autodisconnect()
812 mod_timer(&xprt->timer, xprt->last_used + xprt->idle_timeout); in xprt_schedule_autodisconnect()
820 if (!RB_EMPTY_ROOT(&xprt->recv_queue)) in xprt_init_autodisconnect()
822 /* Reset xprt->last_used to avoid connect/autodisconnect cycling */ in xprt_init_autodisconnect()
823 xprt->last_used = jiffies; in xprt_init_autodisconnect()
824 if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) in xprt_init_autodisconnect()
826 queue_work(xprtiod_workqueue, &xprt->task_cleanup); in xprt_init_autodisconnect()
835 spin_lock(&xprt->transport_lock); in xprt_lock_connect()
836 if (!test_bit(XPRT_LOCKED, &xprt->state)) in xprt_lock_connect()
838 if (xprt->snd_task != task) in xprt_lock_connect()
840 set_bit(XPRT_SND_IS_COOKIE, &xprt->state); in xprt_lock_connect()
841 xprt->snd_task = cookie; in xprt_lock_connect()
844 spin_unlock(&xprt->transport_lock); in xprt_lock_connect()
851 spin_lock(&xprt->transport_lock); in xprt_unlock_connect()
852 if (xprt->snd_task != cookie) in xprt_unlock_connect()
854 if (!test_bit(XPRT_LOCKED, &xprt->state)) in xprt_unlock_connect()
856 xprt->snd_task =NULL; in xprt_unlock_connect()
857 clear_bit(XPRT_SND_IS_COOKIE, &xprt->state); in xprt_unlock_connect()
858 xprt->ops->release_xprt(xprt, NULL); in xprt_unlock_connect()
861 spin_unlock(&xprt->transport_lock); in xprt_unlock_connect()
862 wake_up_bit(&xprt->state, XPRT_LOCKED); in xprt_unlock_connect()
867 * xprt_connect - schedule a transport connect operation
868 * @task: RPC task that is requesting the connect
873 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; in xprt_connect()
877 if (!xprt_bound(xprt)) { in xprt_connect()
878 task->tk_status = -EAGAIN; in xprt_connect()
881 if (!xprt_lock_write(xprt, task)) in xprt_connect()
884 if (!xprt_connected(xprt) && !test_bit(XPRT_CLOSE_WAIT, &xprt->state)) { in xprt_connect()
885 task->tk_rqstp->rq_connect_cookie = xprt->connect_cookie; in xprt_connect()
886 rpc_sleep_on_timeout(&xprt->pending, task, NULL, in xprt_connect()
887 xprt_request_timeout(task->tk_rqstp)); in xprt_connect()
889 if (test_bit(XPRT_CLOSING, &xprt->state)) in xprt_connect()
891 if (xprt_test_and_set_connecting(xprt)) in xprt_connect()
894 if (!xprt_connected(xprt)) { in xprt_connect()
895 xprt->stat.connect_start = jiffies; in xprt_connect()
896 xprt->ops->connect(xprt, task); in xprt_connect()
899 task->tk_status = 0; in xprt_connect()
900 rpc_wake_up_queued_task(&xprt->pending, task); in xprt_connect()
907 * xprt_reconnect_delay - compute the wait before scheduling a connect
915 start = xprt->stat.connect_start + xprt->reestablish_timeout; in xprt_reconnect_delay()
916 if (time_after(start, now)) in xprt_reconnect_delay()
917 return start - now; in xprt_reconnect_delay()
923 * xprt_reconnect_backoff - compute the new re-establish timeout
930 xprt->reestablish_timeout <<= 1; in xprt_reconnect_backoff()
931 if (xprt->reestablish_timeout > xprt->max_reconnect_timeout) in xprt_reconnect_backoff()
932 xprt->reestablish_timeout = xprt->max_reconnect_timeout; in xprt_reconnect_backoff()
933 if (xprt->reestablish_timeout < init_to) in xprt_reconnect_backoff()
934 xprt->reestablish_timeout = init_to; in xprt_reconnect_backoff()
946 if (xid1 == xid2) in xprt_xid_cmp()
948 if ((__force u32)xid1 < (__force u32)xid2) in xprt_xid_cmp()
956 struct rb_node *n = xprt->recv_queue.rb_node; in xprt_request_rb_find()
961 switch (xprt_xid_cmp(xid, req->rq_xid)) { in xprt_request_rb_find()
963 n = n->rb_left; in xprt_request_rb_find()
966 n = n->rb_right; in xprt_request_rb_find()
978 struct rb_node **p = &xprt->recv_queue.rb_node; in xprt_request_rb_insert()
985 switch(xprt_xid_cmp(new->rq_xid, req->rq_xid)) { in xprt_request_rb_insert()
987 p = &n->rb_left; in xprt_request_rb_insert()
990 p = &n->rb_right; in xprt_request_rb_insert()
997 rb_link_node(&new->rq_recv, n, p); in xprt_request_rb_insert()
998 rb_insert_color(&new->rq_recv, &xprt->recv_queue); in xprt_request_rb_insert()
1004 rb_erase(&req->rq_recv, &xprt->recv_queue); in xprt_request_rb_remove()
1008 * xprt_lookup_rqst - find an RPC request corresponding to an XID
1010 * @xid: RPC XID of incoming reply
1012 * Caller holds xprt->queue_lock.
1019 if (entry != NULL) { in xprt_lookup_rqst()
1021 entry->rq_rtt = ktime_sub(ktime_get(), entry->rq_xtime); in xprt_lookup_rqst()
1025 dprintk("RPC: xprt_lookup_rqst did not find xid %08x\n", in xprt_lookup_rqst()
1027 trace_xprt_lookup_rqst(xprt, xid, -ENOENT); in xprt_lookup_rqst()
1028 xprt->stat.bad_xids++; in xprt_lookup_rqst()
1036 return atomic_read(&req->rq_pin) != 0; in xprt_is_pinned_rqst()
1040 * xprt_pin_rqst - Pin a request on the transport receive list
1044 * so should be holding xprt->queue_lock.
1048 atomic_inc(&req->rq_pin); in xprt_pin_rqst()
1053 * xprt_unpin_rqst - Unpin a request on the transport receive list
1056 * Caller should be holding xprt->queue_lock.
1060 if (!test_bit(RPC_TASK_MSG_PIN_WAIT, &req->rq_task->tk_runstate)) { in xprt_unpin_rqst()
1061 atomic_dec(&req->rq_pin); in xprt_unpin_rqst()
1064 if (atomic_dec_and_test(&req->rq_pin)) in xprt_unpin_rqst()
1065 wake_up_var(&req->rq_pin); in xprt_unpin_rqst()
1071 wait_var_event(&req->rq_pin, !xprt_is_pinned_rqst(req)); in xprt_wait_on_pinned_rqst()
1077 return !test_bit(RPC_TASK_NEED_RECV, &task->tk_runstate) && in xprt_request_data_received()
1078 READ_ONCE(task->tk_rqstp->rq_reply_bytes_recvd) != 0; in xprt_request_data_received()
1084 return !test_bit(RPC_TASK_NEED_RECV, &task->tk_runstate) && in xprt_request_need_enqueue_receive()
1085 READ_ONCE(task->tk_rqstp->rq_reply_bytes_recvd) == 0; in xprt_request_need_enqueue_receive()
1089 * xprt_request_enqueue_receive - Add an request to the receive queue
1090 * @task: RPC task
1096 struct rpc_rqst *req = task->tk_rqstp; in xprt_request_enqueue_receive()
1097 struct rpc_xprt *xprt = req->rq_xprt; in xprt_request_enqueue_receive()
1099 if (!xprt_request_need_enqueue_receive(task, req)) in xprt_request_enqueue_receive()
1102 xprt_request_prepare(task->tk_rqstp); in xprt_request_enqueue_receive()
1103 spin_lock(&xprt->queue_lock); in xprt_request_enqueue_receive()
1106 memcpy(&req->rq_private_buf, &req->rq_rcv_buf, in xprt_request_enqueue_receive()
1107 sizeof(req->rq_private_buf)); in xprt_request_enqueue_receive()
1111 set_bit(RPC_TASK_NEED_RECV, &task->tk_runstate); in xprt_request_enqueue_receive()
1112 spin_unlock(&xprt->queue_lock); in xprt_request_enqueue_receive()
1115 del_singleshot_timer_sync(&xprt->timer); in xprt_request_enqueue_receive()
1119 * xprt_request_dequeue_receive_locked - Remove a request from the receive queue
1120 * @task: RPC task
1122 * Caller must hold xprt->queue_lock.
1127 struct rpc_rqst *req = task->tk_rqstp; in xprt_request_dequeue_receive_locked()
1129 if (test_and_clear_bit(RPC_TASK_NEED_RECV, &task->tk_runstate)) in xprt_request_dequeue_receive_locked()
1130 xprt_request_rb_remove(req->rq_xprt, req); in xprt_request_dequeue_receive_locked()
1134 * xprt_update_rtt - Update RPC RTT statistics
1135 * @task: RPC request that recently completed
1137 * Caller holds xprt->queue_lock.
1141 struct rpc_rqst *req = task->tk_rqstp; in xprt_update_rtt()
1142 struct rpc_rtt *rtt = task->tk_client->cl_rtt; in xprt_update_rtt()
1143 unsigned int timer = task->tk_msg.rpc_proc->p_timer; in xprt_update_rtt()
1144 long m = usecs_to_jiffies(ktime_to_us(req->rq_rtt)); in xprt_update_rtt()
1146 if (timer) { in xprt_update_rtt()
1147 if (req->rq_ntrans == 1) in xprt_update_rtt()
1149 rpc_set_timeo(rtt, timer, req->rq_ntrans - 1); in xprt_update_rtt()
1155 * xprt_complete_rqst - called when reply processing is complete
1156 * @task: RPC request that recently completed
1159 * Caller holds xprt->queue_lock.
1163 struct rpc_rqst *req = task->tk_rqstp; in xprt_complete_rqst()
1164 struct rpc_xprt *xprt = req->rq_xprt; in xprt_complete_rqst()
1166 xprt->stat.recvs++; in xprt_complete_rqst()
1168 req->rq_private_buf.len = copied; in xprt_complete_rqst()
1170 /* req->rq_reply_bytes_recvd */ in xprt_complete_rqst()
1172 req->rq_reply_bytes_recvd = copied; in xprt_complete_rqst()
1174 rpc_wake_up_queued_task(&xprt->pending, task); in xprt_complete_rqst()
1180 struct rpc_rqst *req = task->tk_rqstp; in xprt_timer()
1181 struct rpc_xprt *xprt = req->rq_xprt; in xprt_timer()
1183 if (task->tk_status != -ETIMEDOUT) in xprt_timer()
1186 trace_xprt_timer(xprt, req->rq_xid, task->tk_status); in xprt_timer()
1187 if (!req->rq_reply_bytes_recvd) { in xprt_timer()
1188 if (xprt->ops->timer) in xprt_timer()
1189 xprt->ops->timer(xprt, task); in xprt_timer()
1191 task->tk_status = 0; in xprt_timer()
1195 * xprt_wait_for_reply_request_def - wait for reply
1200 * the retransmit timeout based on round-trip time estimation,
1205 struct rpc_rqst *req = task->tk_rqstp; in xprt_wait_for_reply_request_def()
1207 rpc_sleep_on_timeout(&req->rq_xprt->pending, task, xprt_timer, in xprt_wait_for_reply_request_def()
1213 * xprt_wait_for_reply_request_rtt - wait for reply using RTT estimator
1221 int timer = task->tk_msg.rpc_proc->p_timer; in xprt_wait_for_reply_request_rtt()
1222 struct rpc_clnt *clnt = task->tk_client; in xprt_wait_for_reply_request_rtt()
1223 struct rpc_rtt *rtt = clnt->cl_rtt; in xprt_wait_for_reply_request_rtt()
1224 struct rpc_rqst *req = task->tk_rqstp; in xprt_wait_for_reply_request_rtt()
1225 unsigned long max_timeout = clnt->cl_timeout->to_maxval; in xprt_wait_for_reply_request_rtt()
1229 timeout <<= rpc_ntimeo(rtt, timer) + req->rq_retries; in xprt_wait_for_reply_request_rtt()
1230 if (timeout > max_timeout || timeout == 0) in xprt_wait_for_reply_request_rtt()
1232 rpc_sleep_on_timeout(&req->rq_xprt->pending, task, xprt_timer, in xprt_wait_for_reply_request_rtt()
1238 * xprt_request_wait_receive - wait for the reply to an RPC request
1239 * @task: RPC task about to send a request
1244 struct rpc_rqst *req = task->tk_rqstp; in xprt_request_wait_receive()
1245 struct rpc_xprt *xprt = req->rq_xprt; in xprt_request_wait_receive()
1247 if (!test_bit(RPC_TASK_NEED_RECV, &task->tk_runstate)) in xprt_request_wait_receive()
1250 * Sleep on the pending queue if we're expecting a reply. in xprt_request_wait_receive()
1252 * req->rq_reply_bytes_recvd, and the call to rpc_sleep_on(). in xprt_request_wait_receive()
1254 spin_lock(&xprt->queue_lock); in xprt_request_wait_receive()
1255 if (test_bit(RPC_TASK_NEED_RECV, &task->tk_runstate)) { in xprt_request_wait_receive()
1256 xprt->ops->wait_for_reply_request(task); in xprt_request_wait_receive()
1258 * Send an extra queue wakeup call if the in xprt_request_wait_receive()
1262 if (xprt_request_retransmit_after_disconnect(task)) in xprt_request_wait_receive()
1263 rpc_wake_up_queued_task_set_status(&xprt->pending, in xprt_request_wait_receive()
1264 task, -ENOTCONN); in xprt_request_wait_receive()
1266 spin_unlock(&xprt->queue_lock); in xprt_request_wait_receive()
1272 return !test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate); in xprt_request_need_enqueue_transmit()
1276 * xprt_request_enqueue_transmit - queue a task for transmission
1284 struct rpc_rqst *pos, *req = task->tk_rqstp; in xprt_request_enqueue_transmit()
1285 struct rpc_xprt *xprt = req->rq_xprt; in xprt_request_enqueue_transmit()
1287 if (xprt_request_need_enqueue_transmit(task, req)) { in xprt_request_enqueue_transmit()
1288 req->rq_bytes_sent = 0; in xprt_request_enqueue_transmit()
1289 spin_lock(&xprt->queue_lock); in xprt_request_enqueue_transmit()
1294 if (req->rq_cong) { in xprt_request_enqueue_transmit()
1296 list_for_each_entry(pos, &xprt->xmit_queue, rq_xmit) { in xprt_request_enqueue_transmit()
1297 if (pos->rq_cong) in xprt_request_enqueue_transmit()
1300 list_add_tail(&req->rq_xmit, &pos->rq_xmit); in xprt_request_enqueue_transmit()
1301 INIT_LIST_HEAD(&req->rq_xmit2); in xprt_request_enqueue_transmit()
1304 } else if (RPC_IS_SWAPPER(task)) { in xprt_request_enqueue_transmit()
1305 list_for_each_entry(pos, &xprt->xmit_queue, rq_xmit) { in xprt_request_enqueue_transmit()
1306 if (pos->rq_cong || pos->rq_bytes_sent) in xprt_request_enqueue_transmit()
1308 if (RPC_IS_SWAPPER(pos->rq_task)) in xprt_request_enqueue_transmit()
1311 list_add_tail(&req->rq_xmit, &pos->rq_xmit); in xprt_request_enqueue_transmit()
1312 INIT_LIST_HEAD(&req->rq_xmit2); in xprt_request_enqueue_transmit()
1315 } else if (!req->rq_seqno) { in xprt_request_enqueue_transmit()
1316 list_for_each_entry(pos, &xprt->xmit_queue, rq_xmit) { in xprt_request_enqueue_transmit()
1317 if (pos->rq_task->tk_owner != task->tk_owner) in xprt_request_enqueue_transmit()
1319 list_add_tail(&req->rq_xmit2, &pos->rq_xmit2); in xprt_request_enqueue_transmit()
1320 INIT_LIST_HEAD(&req->rq_xmit); in xprt_request_enqueue_transmit()
1324 list_add_tail(&req->rq_xmit, &xprt->xmit_queue); in xprt_request_enqueue_transmit()
1325 INIT_LIST_HEAD(&req->rq_xmit2); in xprt_request_enqueue_transmit()
1327 set_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate); in xprt_request_enqueue_transmit()
1328 spin_unlock(&xprt->queue_lock); in xprt_request_enqueue_transmit()
1333 * xprt_request_dequeue_transmit_locked - remove a task from the transmission queue
1337 * Caller must hold xprt->queue_lock
1342 struct rpc_rqst *req = task->tk_rqstp; in xprt_request_dequeue_transmit_locked()
1344 if (!test_and_clear_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate)) in xprt_request_dequeue_transmit_locked()
1346 if (!list_empty(&req->rq_xmit)) { in xprt_request_dequeue_transmit_locked()
1347 list_del(&req->rq_xmit); in xprt_request_dequeue_transmit_locked()
1348 if (!list_empty(&req->rq_xmit2)) { in xprt_request_dequeue_transmit_locked()
1349 struct rpc_rqst *next = list_first_entry(&req->rq_xmit2, in xprt_request_dequeue_transmit_locked()
1351 list_del(&req->rq_xmit2); in xprt_request_dequeue_transmit_locked()
1352 list_add_tail(&next->rq_xmit, &next->rq_xprt->xmit_queue); in xprt_request_dequeue_transmit_locked()
1355 list_del(&req->rq_xmit2); in xprt_request_dequeue_transmit_locked()
1359 * xprt_request_dequeue_transmit - remove a task from the transmission queue
1367 struct rpc_rqst *req = task->tk_rqstp; in xprt_request_dequeue_transmit()
1368 struct rpc_xprt *xprt = req->rq_xprt; in xprt_request_dequeue_transmit()
1370 spin_lock(&xprt->queue_lock); in xprt_request_dequeue_transmit()
1372 spin_unlock(&xprt->queue_lock); in xprt_request_dequeue_transmit()
1376 * xprt_request_dequeue_xprt - remove a task from the transmit+receive queue
1385 struct rpc_rqst *req = task->tk_rqstp; in xprt_request_dequeue_xprt()
1386 struct rpc_xprt *xprt = req->rq_xprt; in xprt_request_dequeue_xprt()
1388 if (test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate) || in xprt_request_dequeue_xprt()
1389 test_bit(RPC_TASK_NEED_RECV, &task->tk_runstate) || in xprt_request_dequeue_xprt()
1391 spin_lock(&xprt->queue_lock); in xprt_request_dequeue_xprt()
1395 set_bit(RPC_TASK_MSG_PIN_WAIT, &task->tk_runstate); in xprt_request_dequeue_xprt()
1396 spin_unlock(&xprt->queue_lock); in xprt_request_dequeue_xprt()
1398 spin_lock(&xprt->queue_lock); in xprt_request_dequeue_xprt()
1399 clear_bit(RPC_TASK_MSG_PIN_WAIT, &task->tk_runstate); in xprt_request_dequeue_xprt()
1401 spin_unlock(&xprt->queue_lock); in xprt_request_dequeue_xprt()
1406 * xprt_request_prepare - prepare an encoded request for transport
1415 struct rpc_xprt *xprt = req->rq_xprt; in xprt_request_prepare()
1417 if (xprt->ops->prepare_request) in xprt_request_prepare()
1418 xprt->ops->prepare_request(req); in xprt_request_prepare()
1422 * xprt_request_need_retransmit - Test if a task needs retransmission
1434 * xprt_prepare_transmit - reserve the transport before sending a request
1435 * @task: RPC task about to send a request
1440 struct rpc_rqst *req = task->tk_rqstp; in xprt_prepare_transmit()
1441 struct rpc_xprt *xprt = req->rq_xprt; in xprt_prepare_transmit()
1443 if (!xprt_lock_write(xprt, task)) { in xprt_prepare_transmit()
1445 if (!test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate)) in xprt_prepare_transmit()
1446 rpc_wake_up_queued_task_set_status(&xprt->sending, in xprt_prepare_transmit()
1456 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; in xprt_end_transmit()
1463 * xprt_request_transmit - send an RPC request on a transport
1465 * @snd_task: RPC task that owns the transport lock
1468 * Note that if the request is not the same as snd_task, then it
1475 struct rpc_xprt *xprt = req->rq_xprt; in xprt_request_transmit()
1476 struct rpc_task *task = req->rq_task; in xprt_request_transmit()
1481 if (!req->rq_bytes_sent) { in xprt_request_transmit()
1482 if (xprt_request_data_received(task)) { in xprt_request_transmit()
1487 if (rpcauth_xmit_need_reencode(task)) { in xprt_request_transmit()
1488 status = -EBADMSG; in xprt_request_transmit()
1491 if (RPC_SIGNALLED(task)) { in xprt_request_transmit()
1492 status = -ERESTARTSYS; in xprt_request_transmit()
1498 * Update req->rq_ntrans before transmitting to avoid races with in xprt_request_transmit()
1502 req->rq_ntrans++; in xprt_request_transmit()
1504 trace_rpc_xdr_sendto(task, &req->rq_snd_buf); in xprt_request_transmit()
1505 connect_cookie = xprt->connect_cookie; in xprt_request_transmit()
1506 status = xprt->ops->send_request(req); in xprt_request_transmit()
1507 if (status != 0) { in xprt_request_transmit()
1508 req->rq_ntrans--; in xprt_request_transmit()
1513 if (is_retrans) in xprt_request_transmit()
1514 task->tk_client->cl_stats->rpcretrans++; in xprt_request_transmit()
1518 task->tk_flags |= RPC_TASK_SENT; in xprt_request_transmit()
1519 spin_lock(&xprt->transport_lock); in xprt_request_transmit()
1521 xprt->stat.sends++; in xprt_request_transmit()
1522 xprt->stat.req_u += xprt->stat.sends - xprt->stat.recvs; in xprt_request_transmit()
1523 xprt->stat.bklog_u += xprt->backlog.qlen; in xprt_request_transmit()
1524 xprt->stat.sending_u += xprt->sending.qlen; in xprt_request_transmit()
1525 xprt->stat.pending_u += xprt->pending.qlen; in xprt_request_transmit()
1526 spin_unlock(&xprt->transport_lock); in xprt_request_transmit()
1528 req->rq_connect_cookie = connect_cookie; in xprt_request_transmit()
1532 rpc_wake_up_queued_task_set_status(&xprt->sending, task, status); in xprt_request_transmit()
1537 * xprt_transmit - send an RPC request on a transport
1538 * @task: controlling RPC task
1548 struct rpc_rqst *next, *req = task->tk_rqstp; in xprt_transmit()
1549 struct rpc_xprt *xprt = req->rq_xprt; in xprt_transmit()
1552 spin_lock(&xprt->queue_lock); in xprt_transmit()
1554 next = list_first_entry_or_null(&xprt->xmit_queue, in xprt_transmit()
1556 if (!next) in xprt_transmit()
1559 spin_unlock(&xprt->queue_lock); in xprt_transmit()
1561 if (status == -EBADMSG && next != req) in xprt_transmit()
1563 spin_lock(&xprt->queue_lock); in xprt_transmit()
1565 if (status < 0) { in xprt_transmit()
1566 if (test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate)) in xprt_transmit()
1567 task->tk_status = status; in xprt_transmit()
1571 if (xprt_request_data_received(task) && in xprt_transmit()
1572 !test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate)) in xprt_transmit()
1574 cond_resched_lock(&xprt->queue_lock); in xprt_transmit()
1576 spin_unlock(&xprt->queue_lock); in xprt_transmit()
1581 if (task->tk_rqstp) in xprt_complete_request_init()
1587 set_bit(XPRT_CONGESTED, &xprt->state); in xprt_add_backlog()
1588 rpc_sleep_on(&xprt->backlog, task, xprt_complete_request_init); in xprt_add_backlog()
1596 if (task->tk_rqstp == NULL) { in __xprt_set_rq()
1598 task->tk_rqstp = req; in __xprt_set_rq()
1606 if (rpc_wake_up_first(&xprt->backlog, __xprt_set_rq, req) == NULL) { in xprt_wake_up_backlog()
1607 clear_bit(XPRT_CONGESTED, &xprt->state); in xprt_wake_up_backlog()
1618 if (!test_bit(XPRT_CONGESTED, &xprt->state)) in xprt_throttle_congested()
1620 spin_lock(&xprt->reserve_lock); in xprt_throttle_congested()
1621 if (test_bit(XPRT_CONGESTED, &xprt->state)) { in xprt_throttle_congested()
1625 spin_unlock(&xprt->reserve_lock); in xprt_throttle_congested()
1632 struct rpc_rqst *req = ERR_PTR(-EAGAIN); in xprt_dynamic_alloc_slot()
1634 if (xprt->num_reqs >= xprt->max_reqs) in xprt_dynamic_alloc_slot()
1636 ++xprt->num_reqs; in xprt_dynamic_alloc_slot()
1637 spin_unlock(&xprt->reserve_lock); in xprt_dynamic_alloc_slot()
1639 spin_lock(&xprt->reserve_lock); in xprt_dynamic_alloc_slot()
1640 if (req != NULL) in xprt_dynamic_alloc_slot()
1642 --xprt->num_reqs; in xprt_dynamic_alloc_slot()
1643 req = ERR_PTR(-ENOMEM); in xprt_dynamic_alloc_slot()
1650 if (xprt->num_reqs > xprt->min_reqs) { in xprt_dynamic_free_slot()
1651 --xprt->num_reqs; in xprt_dynamic_free_slot()
1662 spin_lock(&xprt->reserve_lock); in xprt_alloc_slot()
1663 if (!list_empty(&xprt->free)) { in xprt_alloc_slot()
1664 req = list_entry(xprt->free.next, struct rpc_rqst, rq_list); in xprt_alloc_slot()
1665 list_del(&req->rq_list); in xprt_alloc_slot()
1669 if (!IS_ERR(req)) in xprt_alloc_slot()
1672 case -ENOMEM: in xprt_alloc_slot()
1673 dprintk("RPC: dynamic allocation of request slot " in xprt_alloc_slot()
1675 task->tk_status = -ENOMEM; in xprt_alloc_slot()
1677 case -EAGAIN: in xprt_alloc_slot()
1679 dprintk("RPC: waiting for request slot\n"); in xprt_alloc_slot()
1682 task->tk_status = -EAGAIN; in xprt_alloc_slot()
1684 spin_unlock(&xprt->reserve_lock); in xprt_alloc_slot()
1687 xprt->stat.max_slots = max_t(unsigned int, xprt->stat.max_slots, in xprt_alloc_slot()
1688 xprt->num_reqs); in xprt_alloc_slot()
1689 spin_unlock(&xprt->reserve_lock); in xprt_alloc_slot()
1691 task->tk_status = 0; in xprt_alloc_slot()
1692 task->tk_rqstp = req; in xprt_alloc_slot()
1698 spin_lock(&xprt->reserve_lock); in xprt_free_slot()
1699 if (!xprt_wake_up_backlog(xprt, req) && in xprt_free_slot()
1702 list_add(&req->rq_list, &xprt->free); in xprt_free_slot()
1704 spin_unlock(&xprt->reserve_lock); in xprt_free_slot()
1711 while (!list_empty(&xprt->free)) { in xprt_free_all_slots()
1712 req = list_first_entry(&xprt->free, struct rpc_rqst, rq_list); in xprt_free_all_slots()
1713 list_del(&req->rq_list); in xprt_free_all_slots()
1727 if (xprt == NULL) in xprt_alloc()
1734 if (!req) in xprt_alloc()
1736 list_add(&req->rq_list, &xprt->free); in xprt_alloc()
1738 if (max_alloc > num_prealloc) in xprt_alloc()
1739 xprt->max_reqs = max_alloc; in xprt_alloc()
1741 xprt->max_reqs = num_prealloc; in xprt_alloc()
1742 xprt->min_reqs = num_prealloc; in xprt_alloc()
1743 xprt->num_reqs = num_prealloc; in xprt_alloc()
1756 put_net(xprt->xprt_net); in xprt_free()
1765 req->rq_connect_cookie = xprt_connect_cookie(xprt) - 1; in xprt_init_connect_cookie()
1773 spin_lock(&xprt->reserve_lock); in xprt_alloc_xid()
1774 xid = (__force __be32)xprt->xid++; in xprt_alloc_xid()
1775 spin_unlock(&xprt->reserve_lock); in xprt_alloc_xid()
1782 xprt->xid = prandom_u32(); in xprt_init_xid()
1788 struct rpc_xprt *xprt = task->tk_xprt; in xprt_request_init()
1789 struct rpc_rqst *req = task->tk_rqstp; in xprt_request_init()
1791 req->rq_task = task; in xprt_request_init()
1792 req->rq_xprt = xprt; in xprt_request_init()
1793 req->rq_buffer = NULL; in xprt_request_init()
1794 req->rq_xid = xprt_alloc_xid(xprt); in xprt_request_init()
1796 req->rq_snd_buf.len = 0; in xprt_request_init()
1797 req->rq_snd_buf.buflen = 0; in xprt_request_init()
1798 req->rq_rcv_buf.len = 0; in xprt_request_init()
1799 req->rq_rcv_buf.buflen = 0; in xprt_request_init()
1800 req->rq_snd_buf.bvec = NULL; in xprt_request_init()
1801 req->rq_rcv_buf.bvec = NULL; in xprt_request_init()
1802 req->rq_release_snd_buf = NULL; in xprt_request_init()
1811 xprt->ops->alloc_slot(xprt, task); in xprt_do_reserve()
1812 if (task->tk_rqstp != NULL) in xprt_do_reserve()
1817 * xprt_reserve - allocate an RPC request slot
1818 * @task: RPC task requesting a slot allocation
1820 * If the transport is marked as being congested, or if no more
1826 struct rpc_xprt *xprt = task->tk_xprt; in xprt_reserve()
1828 task->tk_status = 0; in xprt_reserve()
1829 if (task->tk_rqstp != NULL) in xprt_reserve()
1832 task->tk_status = -EAGAIN; in xprt_reserve()
1833 if (!xprt_throttle_congested(xprt, task)) in xprt_reserve()
1838 * xprt_retry_reserve - allocate an RPC request slot
1839 * @task: RPC task requesting a slot allocation
1841 * If no more slots are available, place the task on the transport's
1848 struct rpc_xprt *xprt = task->tk_xprt; in xprt_retry_reserve()
1850 task->tk_status = 0; in xprt_retry_reserve()
1851 if (task->tk_rqstp != NULL) in xprt_retry_reserve()
1854 task->tk_status = -EAGAIN; in xprt_retry_reserve()
1859 * xprt_release - release an RPC request slot
1866 struct rpc_rqst *req = task->tk_rqstp; in xprt_release()
1868 if (req == NULL) { in xprt_release()
1869 if (task->tk_client) { in xprt_release()
1870 xprt = task->tk_xprt; in xprt_release()
1876 xprt = req->rq_xprt; in xprt_release()
1878 spin_lock(&xprt->transport_lock); in xprt_release()
1879 xprt->ops->release_xprt(xprt, task); in xprt_release()
1880 if (xprt->ops->release_request) in xprt_release()
1881 xprt->ops->release_request(task); in xprt_release()
1883 spin_unlock(&xprt->transport_lock); in xprt_release()
1884 if (req->rq_buffer) in xprt_release()
1885 xprt->ops->buf_free(task); in xprt_release()
1886 xdr_free_bvec(&req->rq_rcv_buf); in xprt_release()
1887 xdr_free_bvec(&req->rq_snd_buf); in xprt_release()
1888 if (req->rq_cred != NULL) in xprt_release()
1889 put_rpccred(req->rq_cred); in xprt_release()
1890 if (req->rq_release_snd_buf) in xprt_release()
1891 req->rq_release_snd_buf(req); in xprt_release()
1893 task->tk_rqstp = NULL; in xprt_release()
1894 if (likely(!bc_prealloc(req))) in xprt_release()
1895 xprt->ops->free_slot(xprt, req); in xprt_release()
1904 struct xdr_buf *xbufp = &req->rq_snd_buf; in xprt_init_bc_request()
1906 task->tk_rqstp = req; in xprt_init_bc_request()
1907 req->rq_task = task; in xprt_init_bc_request()
1908 xprt_init_connect_cookie(req, req->rq_xprt); in xprt_init_bc_request()
1913 xbufp->len = xbufp->head[0].iov_len + xbufp->page_len + in xprt_init_bc_request()
1914 xbufp->tail[0].iov_len; in xprt_init_bc_request()
1920 kref_init(&xprt->kref); in xprt_init()
1922 spin_lock_init(&xprt->transport_lock); in xprt_init()
1923 spin_lock_init(&xprt->reserve_lock); in xprt_init()
1924 spin_lock_init(&xprt->queue_lock); in xprt_init()
1926 INIT_LIST_HEAD(&xprt->free); in xprt_init()
1927 xprt->recv_queue = RB_ROOT; in xprt_init()
1928 INIT_LIST_HEAD(&xprt->xmit_queue); in xprt_init()
1929 #if defined(CONFIG_SUNRPC_BACKCHANNEL) in xprt_init()
1930 spin_lock_init(&xprt->bc_pa_lock); in xprt_init()
1931 INIT_LIST_HEAD(&xprt->bc_pa_list); in xprt_init()
1933 INIT_LIST_HEAD(&xprt->xprt_switch); in xprt_init()
1935 xprt->last_used = jiffies; in xprt_init()
1936 xprt->cwnd = RPC_INITCWND; in xprt_init()
1937 xprt->bind_index = 0; in xprt_init()
1939 rpc_init_wait_queue(&xprt->binding, "xprt_binding"); in xprt_init()
1940 rpc_init_wait_queue(&xprt->pending, "xprt_pending"); in xprt_init()
1941 rpc_init_wait_queue(&xprt->sending, "xprt_sending"); in xprt_init()
1942 rpc_init_priority_wait_queue(&xprt->backlog, "xprt_backlog"); in xprt_init()
1946 xprt->xprt_net = get_net(net); in xprt_init()
1950 * xprt_create_transport - create an RPC transport
1951 * @args: rpc transport creation arguments
1961 if (t->ident == args->ident) { in xprt_create_transport()
1967 dprintk("RPC: transport (%d) not supported\n", args->ident); in xprt_create_transport()
1968 return ERR_PTR(-EIO); in xprt_create_transport()
1971 xprt = t->setup(args); in xprt_create_transport()
1972 if (IS_ERR(xprt)) in xprt_create_transport()
1974 if (args->flags & XPRT_CREATE_NO_IDLE_TIMEOUT) in xprt_create_transport()
1975 xprt->idle_timeout = 0; in xprt_create_transport()
1976 INIT_WORK(&xprt->task_cleanup, xprt_autoclose); in xprt_create_transport()
1977 if (xprt_has_timer(xprt)) in xprt_create_transport()
1978 timer_setup(&xprt->timer, xprt_init_autodisconnect, 0); in xprt_create_transport()
1980 timer_setup(&xprt->timer, NULL, 0); in xprt_create_transport()
1982 if (strlen(args->servername) > RPC_MAXNETNAMELEN) { in xprt_create_transport()
1984 return ERR_PTR(-EINVAL); in xprt_create_transport()
1986 xprt->servername = kstrdup(args->servername, GFP_KERNEL); in xprt_create_transport()
1987 if (xprt->servername == NULL) { in xprt_create_transport()
1989 return ERR_PTR(-ENOMEM); in xprt_create_transport()
2007 rpc_destroy_wait_queue(&xprt->binding); in xprt_destroy_cb()
2008 rpc_destroy_wait_queue(&xprt->pending); in xprt_destroy_cb()
2009 rpc_destroy_wait_queue(&xprt->sending); in xprt_destroy_cb()
2010 rpc_destroy_wait_queue(&xprt->backlog); in xprt_destroy_cb()
2011 kfree(xprt->servername); in xprt_destroy_cb()
2020 xprt->ops->destroy(xprt); in xprt_destroy_cb()
2024 * xprt_destroy - destroy an RPC transport, killing off all requests.
2033 wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_UNINTERRUPTIBLE); in xprt_destroy()
2035 del_timer_sync(&xprt->timer); in xprt_destroy()
2041 INIT_WORK(&xprt->task_cleanup, xprt_destroy_cb); in xprt_destroy()
2042 schedule_work(&xprt->task_cleanup); in xprt_destroy()
2051 * xprt_get - return a reference to an RPC transport.
2057 if (xprt != NULL && kref_get_unless_zero(&xprt->kref)) in xprt_get()
2064 * xprt_put - release a reference to an RPC transport.
2070 if (xprt != NULL) in xprt_put()
2071 kref_put(&xprt->kref, xprt_destroy_kref); in xprt_put()