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>
65 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
83 unsigned long timeout = jiffies + req->rq_timeout; in xprt_request_timeout()
85 if (time_before(timeout, req->rq_majortimeo)) in xprt_request_timeout()
87 return req->rq_majortimeo; in xprt_request_timeout()
91 * xprt_register_transport - register a transport implementation
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.
99 * -EEXIST: transport already registered
100 * -EINVAL: transport module being unloaded
107 result = -EEXIST; in xprt_register_transport()
111 if (t->ident == transport->ident) in xprt_register_transport()
115 list_add_tail(&transport->list, &xprt_list); in xprt_register_transport()
116 printk(KERN_INFO "RPC: Registered %s transport module.\n", in xprt_register_transport()
117 transport->name); in xprt_register_transport()
127 * xprt_unregister_transport - unregister a transport implementation
132 * -ENOENT: transport never registered
142 if (t == transport) { in xprt_unregister_transport()
144 "RPC: Unregistered %s transport module.\n", in xprt_unregister_transport()
145 transport->name); in xprt_unregister_transport()
146 list_del_init(&transport->list); in xprt_unregister_transport()
150 result = -ENOENT; in xprt_unregister_transport()
161 module_put(t->owner); in xprt_class_release()
170 if (t->ident != ident) in xprt_class_find_by_ident_locked()
172 if (!try_module_get(t->owner)) in xprt_class_find_by_ident_locked()
197 for (i = 0; t->netid[i][0] != '\0'; i++) { in xprt_class_find_by_netid_locked()
198 if (strcmp(t->netid[i], netid) != 0) in xprt_class_find_by_netid_locked()
200 if (!try_module_get(t->owner)) in xprt_class_find_by_netid_locked()
215 if (!t) { in xprt_class_find_by_netid()
217 request_module("rpc%s", netid); in xprt_class_find_by_netid()
226 * xprt_find_transport_ident - convert a netid into a transport identifier
231 * -ENOENT: transport module not available
239 if (!t) in xprt_find_transport_ident()
240 return -ENOENT; in xprt_find_transport_ident()
241 ret = t->ident; in xprt_find_transport_ident()
249 xprt->snd_task = NULL; in xprt_clear_locked()
250 if (!test_bit(XPRT_CLOSE_WAIT, &xprt->state)) in xprt_clear_locked()
251 clear_bit_unlock(XPRT_LOCKED, &xprt->state); in xprt_clear_locked()
253 queue_work(xprtiod_workqueue, &xprt->task_cleanup); in xprt_clear_locked()
257 * xprt_reserve_xprt - serialize write access to transports
267 struct rpc_rqst *req = task->tk_rqstp; in xprt_reserve_xprt()
269 if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { in xprt_reserve_xprt()
270 if (task == xprt->snd_task) in xprt_reserve_xprt()
274 if (test_bit(XPRT_WRITE_SPACE, &xprt->state)) in xprt_reserve_xprt()
276 xprt->snd_task = task; in xprt_reserve_xprt()
285 task->tk_status = -EAGAIN; in xprt_reserve_xprt()
286 if (RPC_IS_SOFT(task) || RPC_IS_SOFTCONN(task)) in xprt_reserve_xprt()
287 rpc_sleep_on_timeout(&xprt->sending, task, NULL, in xprt_reserve_xprt()
290 rpc_sleep_on(&xprt->sending, task, NULL); in xprt_reserve_xprt()
298 return test_bit(XPRT_CWND_WAIT, &xprt->state); in xprt_need_congestion_window_wait()
304 if (!list_empty(&xprt->xmit_queue)) { in xprt_set_congestion_window_wait()
305 /* Peek at head of queue to see if it can make progress */ in xprt_set_congestion_window_wait()
306 if (list_first_entry(&xprt->xmit_queue, struct rpc_rqst, in xprt_set_congestion_window_wait()
307 rq_xmit)->rq_cong) in xprt_set_congestion_window_wait()
310 set_bit(XPRT_CWND_WAIT, &xprt->state); in xprt_set_congestion_window_wait()
316 if (!RPCXPRT_CONGESTED(xprt)) in xprt_test_and_clear_congestion_window_wait()
317 clear_bit(XPRT_CWND_WAIT, &xprt->state); in xprt_test_and_clear_congestion_window_wait()
321 * xprt_reserve_xprt_cong - serialize write access to transports
327 * Note that the lock is only granted if we know there are free slots.
331 struct rpc_rqst *req = task->tk_rqstp; in xprt_reserve_xprt_cong()
333 if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { in xprt_reserve_xprt_cong()
334 if (task == xprt->snd_task) in xprt_reserve_xprt_cong()
338 if (req == NULL) { in xprt_reserve_xprt_cong()
339 xprt->snd_task = task; in xprt_reserve_xprt_cong()
342 if (test_bit(XPRT_WRITE_SPACE, &xprt->state)) in xprt_reserve_xprt_cong()
344 if (!xprt_need_congestion_window_wait(xprt)) { in xprt_reserve_xprt_cong()
345 xprt->snd_task = task; in xprt_reserve_xprt_cong()
351 task->tk_status = -EAGAIN; in xprt_reserve_xprt_cong()
352 if (RPC_IS_SOFT(task) || RPC_IS_SOFTCONN(task)) in xprt_reserve_xprt_cong()
353 rpc_sleep_on_timeout(&xprt->sending, task, NULL, in xprt_reserve_xprt_cong()
356 rpc_sleep_on(&xprt->sending, task, NULL); in xprt_reserve_xprt_cong()
368 if (test_bit(XPRT_LOCKED, &xprt->state) && xprt->snd_task == task) in xprt_lock_write()
370 spin_lock(&xprt->transport_lock); in xprt_lock_write()
371 retval = xprt->ops->reserve_xprt(xprt, task); in xprt_lock_write()
372 spin_unlock(&xprt->transport_lock); in xprt_lock_write()
380 xprt->snd_task = task; in __xprt_lock_write_func()
386 if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) in __xprt_lock_write_next()
388 if (test_bit(XPRT_WRITE_SPACE, &xprt->state)) in __xprt_lock_write_next()
390 if (rpc_wake_up_first_on_wq(xprtiod_workqueue, &xprt->sending, in __xprt_lock_write_next()
399 if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) in __xprt_lock_write_next_cong()
401 if (test_bit(XPRT_WRITE_SPACE, &xprt->state)) in __xprt_lock_write_next_cong()
403 if (xprt_need_congestion_window_wait(xprt)) in __xprt_lock_write_next_cong()
405 if (rpc_wake_up_first_on_wq(xprtiod_workqueue, &xprt->sending, in __xprt_lock_write_next_cong()
413 * xprt_release_xprt - allow other requests to use a transport
421 if (xprt->snd_task == task) { in xprt_release_xprt()
430 * xprt_release_xprt_cong - allow other requests to use a transport
435 * transport if the transport's congestion window allows it.
439 if (xprt->snd_task == task) { in xprt_release_xprt_cong()
449 if (xprt->snd_task != task) in xprt_release_write()
451 spin_lock(&xprt->transport_lock); in xprt_release_write()
452 xprt->ops->release_xprt(xprt, task); in xprt_release_write()
453 spin_unlock(&xprt->transport_lock); in xprt_release_write()
457 * Van Jacobson congestion avoidance. Check if the congestion window
458 * overflowed. Put the task to sleep if this is the case.
463 if (req->rq_cong) in __xprt_get_cong()
465 trace_xprt_get_cong(xprt, req->rq_task); in __xprt_get_cong()
466 if (RPCXPRT_CONGESTED(xprt)) { in __xprt_get_cong()
470 req->rq_cong = 1; in __xprt_get_cong()
471 xprt->cong += RPC_CWNDSCALE; in __xprt_get_cong()
482 if (!req->rq_cong) in __xprt_put_cong()
484 req->rq_cong = 0; in __xprt_put_cong()
485 xprt->cong -= RPC_CWNDSCALE; in __xprt_put_cong()
487 trace_xprt_put_cong(xprt, req->rq_task); in __xprt_put_cong()
492 * xprt_request_get_cong - Request congestion control credits
494 * @req: pointer to RPC request
503 if (req->rq_cong) in xprt_request_get_cong()
505 spin_lock(&xprt->transport_lock); in xprt_request_get_cong()
507 spin_unlock(&xprt->transport_lock); in xprt_request_get_cong()
513 * xprt_release_rqst_cong - housekeeping when request is complete
514 * @task: RPC request that recently completed
520 struct rpc_rqst *req = task->tk_rqstp; in xprt_release_rqst_cong()
522 __xprt_put_cong(req->rq_xprt, req); in xprt_release_rqst_cong()
528 if (test_and_clear_bit(XPRT_CWND_WAIT, &xprt->state)) in xprt_clear_congestion_window_wait_locked()
534 * entry on xprt->sending
539 if (test_and_clear_bit(XPRT_CWND_WAIT, &xprt->state)) { in xprt_clear_congestion_window_wait()
540 spin_lock(&xprt->transport_lock); in xprt_clear_congestion_window_wait()
542 spin_unlock(&xprt->transport_lock); in xprt_clear_congestion_window_wait()
547 * xprt_adjust_cwnd - adjust transport congestion window
549 * @task: recently completed RPC request used to adjust window
550 * @result: result code of completed RPC request
552 * The transport code maintains an estimate on the maximum number of out-
553 * standing RPC requests, using a smoothed version of the congestion
555 * congestion algorithm: If a retransmit occurs, the congestion window is
558 * - a reply is received and
559 * - a full number of requests are outstanding and
560 * - the congestion window hasn't been updated recently.
564 struct rpc_rqst *req = task->tk_rqstp; in xprt_adjust_cwnd()
565 unsigned long cwnd = xprt->cwnd; in xprt_adjust_cwnd()
567 if (result >= 0 && cwnd <= xprt->cong) { in xprt_adjust_cwnd()
571 if (cwnd > RPC_MAXCWND(xprt)) in xprt_adjust_cwnd()
574 } else if (result == -ETIMEDOUT) { in xprt_adjust_cwnd()
576 if (cwnd < RPC_CWNDSCALE) in xprt_adjust_cwnd()
579 dprintk("RPC: cong %ld, cwnd was %ld, now %ld\n", in xprt_adjust_cwnd()
580 xprt->cong, xprt->cwnd, cwnd); in xprt_adjust_cwnd()
581 xprt->cwnd = cwnd; in xprt_adjust_cwnd()
587 * xprt_wake_pending_tasks - wake all tasks on a transport's pending queue
594 if (status < 0) in xprt_wake_pending_tasks()
595 rpc_wake_up_status(&xprt->pending, status); in xprt_wake_pending_tasks()
597 rpc_wake_up(&xprt->pending); in xprt_wake_pending_tasks()
602 * xprt_wait_for_buffer_space - wait for transport output buffer to clear
607 * an incomplete RPC call transmission.
611 set_bit(XPRT_WRITE_SPACE, &xprt->state); in xprt_wait_for_buffer_space()
618 if (test_and_clear_bit(XPRT_WRITE_SPACE, &xprt->state)) { in xprt_clear_write_space_locked()
620 dprintk("RPC: write space: waking waiting task on " in xprt_clear_write_space_locked()
628 * xprt_write_space - wake the task waiting for transport output buffer space
637 if (!test_bit(XPRT_WRITE_SPACE, &xprt->state)) in xprt_write_space()
639 spin_lock(&xprt->transport_lock); in xprt_write_space()
641 spin_unlock(&xprt->transport_lock); in xprt_write_space()
648 s64 delta = ktime_to_ns(ktime_get() - abstime); in xprt_abs_ktime_to_jiffies()
650 jiffies - nsecs_to_jiffies(delta) : in xprt_abs_ktime_to_jiffies()
651 jiffies + nsecs_to_jiffies(-delta); in xprt_abs_ktime_to_jiffies()
657 unsigned long majortimeo = req->rq_timeout; in xprt_calc_majortimeo()
659 if (to->to_exponential) in xprt_calc_majortimeo()
660 majortimeo <<= to->to_retries; in xprt_calc_majortimeo()
662 majortimeo += to->to_increment * to->to_retries; in xprt_calc_majortimeo()
663 if (majortimeo > to->to_maxval || majortimeo == 0) in xprt_calc_majortimeo()
664 majortimeo = to->to_maxval; in xprt_calc_majortimeo()
671 req->rq_majortimeo += xprt_calc_majortimeo(req, to); in xprt_reset_majortimeo()
676 req->rq_minortimeo += req->rq_timeout; in xprt_reset_minortimeo()
683 struct rpc_xprt *xprt = req->rq_xprt; in xprt_init_majortimeo()
685 if (likely(xprt && xprt_connected(xprt))) in xprt_init_majortimeo()
688 time_init = xprt_abs_ktime_to_jiffies(task->tk_start); in xprt_init_majortimeo()
690 req->rq_timeout = to->to_initval; in xprt_init_majortimeo()
691 req->rq_majortimeo = time_init + xprt_calc_majortimeo(req, to); in xprt_init_majortimeo()
692 req->rq_minortimeo = time_init + req->rq_timeout; in xprt_init_majortimeo()
696 * xprt_adjust_timeout - adjust timeout values for next retransmit
697 * @req: RPC request containing parameters to use for the adjustment
702 struct rpc_xprt *xprt = req->rq_xprt; in xprt_adjust_timeout()
703 const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout; in xprt_adjust_timeout()
706 if (time_before(jiffies, req->rq_majortimeo)) { in xprt_adjust_timeout()
707 if (time_before(jiffies, req->rq_minortimeo)) in xprt_adjust_timeout()
709 if (to->to_exponential) in xprt_adjust_timeout()
710 req->rq_timeout <<= 1; in xprt_adjust_timeout()
712 req->rq_timeout += to->to_increment; in xprt_adjust_timeout()
713 if (to->to_maxval && req->rq_timeout >= to->to_maxval) in xprt_adjust_timeout()
714 req->rq_timeout = to->to_maxval; in xprt_adjust_timeout()
715 req->rq_retries++; in xprt_adjust_timeout()
717 req->rq_timeout = to->to_initval; in xprt_adjust_timeout()
718 req->rq_retries = 0; in xprt_adjust_timeout()
721 spin_lock(&xprt->transport_lock); in xprt_adjust_timeout()
722 rpc_init_rtt(req->rq_task->tk_client->cl_rtt, to->to_initval); in xprt_adjust_timeout()
723 spin_unlock(&xprt->transport_lock); in xprt_adjust_timeout()
724 status = -ETIMEDOUT; in xprt_adjust_timeout()
728 if (req->rq_timeout == 0) { in xprt_adjust_timeout()
730 req->rq_timeout = 5 * HZ; in xprt_adjust_timeout()
742 xprt->connect_cookie++; in xprt_autoclose()
744 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); in xprt_autoclose()
745 xprt->ops->close(xprt); in xprt_autoclose()
747 wake_up_bit(&xprt->state, XPRT_LOCKED); in xprt_autoclose()
752 * xprt_disconnect_done - mark a transport as disconnected
759 spin_lock(&xprt->transport_lock); in xprt_disconnect_done()
763 xprt_wake_pending_tasks(xprt, -ENOTCONN); in xprt_disconnect_done()
764 spin_unlock(&xprt->transport_lock); in xprt_disconnect_done()
769 * xprt_schedule_autoclose_locked - Try to schedule an autoclose RPC call
774 if (test_and_set_bit(XPRT_CLOSE_WAIT, &xprt->state)) in xprt_schedule_autoclose_locked()
776 if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) in xprt_schedule_autoclose_locked()
777 queue_work(xprtiod_workqueue, &xprt->task_cleanup); in xprt_schedule_autoclose_locked()
778 else if (xprt->snd_task && !test_bit(XPRT_SND_IS_COOKIE, &xprt->state)) in xprt_schedule_autoclose_locked()
779 rpc_wake_up_queued_task_set_status(&xprt->pending, in xprt_schedule_autoclose_locked()
780 xprt->snd_task, -ENOTCONN); in xprt_schedule_autoclose_locked()
784 * xprt_force_disconnect - force a transport to disconnect
793 spin_lock(&xprt->transport_lock); in xprt_force_disconnect()
795 spin_unlock(&xprt->transport_lock); in xprt_force_disconnect()
802 return READ_ONCE(xprt->connect_cookie); in xprt_connect_cookie()
808 struct rpc_rqst *req = task->tk_rqstp; in xprt_request_retransmit_after_disconnect()
809 struct rpc_xprt *xprt = req->rq_xprt; in xprt_request_retransmit_after_disconnect()
811 return req->rq_connect_cookie != xprt_connect_cookie(xprt) || in xprt_request_retransmit_after_disconnect()
816 * xprt_conditional_disconnect - force a transport to disconnect
820 * This attempts to break the connection if and only if 'cookie' matches
823 * a batch of RPC requests.
829 spin_lock(&xprt->transport_lock); in xprt_conditional_disconnect()
830 if (cookie != xprt->connect_cookie) in xprt_conditional_disconnect()
832 if (test_bit(XPRT_CLOSING, &xprt->state)) in xprt_conditional_disconnect()
836 spin_unlock(&xprt->transport_lock); in xprt_conditional_disconnect()
842 return xprt->idle_timeout != 0; in xprt_has_timer()
847 __must_hold(&xprt->transport_lock) in xprt_schedule_autodisconnect()
849 xprt->last_used = jiffies; in xprt_schedule_autodisconnect()
850 if (RB_EMPTY_ROOT(&xprt->recv_queue) && xprt_has_timer(xprt)) in xprt_schedule_autodisconnect()
851 mod_timer(&xprt->timer, xprt->last_used + xprt->idle_timeout); in xprt_schedule_autodisconnect()
859 if (!RB_EMPTY_ROOT(&xprt->recv_queue)) in xprt_init_autodisconnect()
861 /* Reset xprt->last_used to avoid connect/autodisconnect cycling */ in xprt_init_autodisconnect()
862 xprt->last_used = jiffies; in xprt_init_autodisconnect()
863 if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) in xprt_init_autodisconnect()
865 queue_work(xprtiod_workqueue, &xprt->task_cleanup); in xprt_init_autodisconnect()
868 #if IS_ENABLED(CONFIG_FAIL_SUNRPC)
871 if (!fail_sunrpc.ignore_client_disconnect && in xprt_inject_disconnect()
873 xprt->ops->inject_disconnect(xprt); in xprt_inject_disconnect()
887 spin_lock(&xprt->transport_lock); in xprt_lock_connect()
888 if (!test_bit(XPRT_LOCKED, &xprt->state)) in xprt_lock_connect()
890 if (xprt->snd_task != task) in xprt_lock_connect()
892 set_bit(XPRT_SND_IS_COOKIE, &xprt->state); in xprt_lock_connect()
893 xprt->snd_task = cookie; in xprt_lock_connect()
896 spin_unlock(&xprt->transport_lock); in xprt_lock_connect()
903 spin_lock(&xprt->transport_lock); in xprt_unlock_connect()
904 if (xprt->snd_task != cookie) in xprt_unlock_connect()
906 if (!test_bit(XPRT_LOCKED, &xprt->state)) in xprt_unlock_connect()
908 xprt->snd_task =NULL; in xprt_unlock_connect()
909 clear_bit(XPRT_SND_IS_COOKIE, &xprt->state); in xprt_unlock_connect()
910 xprt->ops->release_xprt(xprt, NULL); in xprt_unlock_connect()
913 spin_unlock(&xprt->transport_lock); in xprt_unlock_connect()
914 wake_up_bit(&xprt->state, XPRT_LOCKED); in xprt_unlock_connect()
919 * xprt_connect - schedule a transport connect operation
920 * @task: RPC task that is requesting the connect
925 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; in xprt_connect()
929 if (!xprt_bound(xprt)) { in xprt_connect()
930 task->tk_status = -EAGAIN; in xprt_connect()
933 if (!xprt_lock_write(xprt, task)) in xprt_connect()
936 if (!xprt_connected(xprt) && !test_bit(XPRT_CLOSE_WAIT, &xprt->state)) { in xprt_connect()
937 task->tk_rqstp->rq_connect_cookie = xprt->connect_cookie; in xprt_connect()
938 rpc_sleep_on_timeout(&xprt->pending, task, NULL, in xprt_connect()
939 xprt_request_timeout(task->tk_rqstp)); in xprt_connect()
941 if (test_bit(XPRT_CLOSING, &xprt->state)) in xprt_connect()
943 if (xprt_test_and_set_connecting(xprt)) in xprt_connect()
946 if (!xprt_connected(xprt)) { in xprt_connect()
947 xprt->stat.connect_start = jiffies; in xprt_connect()
948 xprt->ops->connect(xprt, task); in xprt_connect()
951 task->tk_status = 0; in xprt_connect()
952 rpc_wake_up_queued_task(&xprt->pending, task); in xprt_connect()
959 * xprt_reconnect_delay - compute the wait before scheduling a connect
967 start = xprt->stat.connect_start + xprt->reestablish_timeout; in xprt_reconnect_delay()
968 if (time_after(start, now)) in xprt_reconnect_delay()
969 return start - now; in xprt_reconnect_delay()
975 * xprt_reconnect_backoff - compute the new re-establish timeout
982 xprt->reestablish_timeout <<= 1; in xprt_reconnect_backoff()
983 if (xprt->reestablish_timeout > xprt->max_reconnect_timeout) in xprt_reconnect_backoff()
984 xprt->reestablish_timeout = xprt->max_reconnect_timeout; in xprt_reconnect_backoff()
985 if (xprt->reestablish_timeout < init_to) in xprt_reconnect_backoff()
986 xprt->reestablish_timeout = init_to; in xprt_reconnect_backoff()
998 if (xid1 == xid2) in xprt_xid_cmp()
1000 if ((__force u32)xid1 < (__force u32)xid2) in xprt_xid_cmp()
1008 struct rb_node *n = xprt->recv_queue.rb_node; in xprt_request_rb_find()
1013 switch (xprt_xid_cmp(xid, req->rq_xid)) { in xprt_request_rb_find()
1015 n = n->rb_left; in xprt_request_rb_find()
1018 n = n->rb_right; in xprt_request_rb_find()
1030 struct rb_node **p = &xprt->recv_queue.rb_node; in xprt_request_rb_insert()
1037 switch(xprt_xid_cmp(new->rq_xid, req->rq_xid)) { in xprt_request_rb_insert()
1039 p = &n->rb_left; in xprt_request_rb_insert()
1042 p = &n->rb_right; in xprt_request_rb_insert()
1049 rb_link_node(&new->rq_recv, n, p); in xprt_request_rb_insert()
1050 rb_insert_color(&new->rq_recv, &xprt->recv_queue); in xprt_request_rb_insert()
1056 rb_erase(&req->rq_recv, &xprt->recv_queue); in xprt_request_rb_remove()
1060 * xprt_lookup_rqst - find an RPC request corresponding to an XID
1062 * @xid: RPC XID of incoming reply
1064 * Caller holds xprt->queue_lock.
1071 if (entry != NULL) { in xprt_lookup_rqst()
1073 entry->rq_rtt = ktime_sub(ktime_get(), entry->rq_xtime); in xprt_lookup_rqst()
1077 dprintk("RPC: xprt_lookup_rqst did not find xid %08x\n", in xprt_lookup_rqst()
1079 trace_xprt_lookup_rqst(xprt, xid, -ENOENT); in xprt_lookup_rqst()
1080 xprt->stat.bad_xids++; in xprt_lookup_rqst()
1088 return atomic_read(&req->rq_pin) != 0; in xprt_is_pinned_rqst()
1092 * xprt_pin_rqst - Pin a request on the transport receive list
1096 * so should be holding xprt->queue_lock.
1100 atomic_inc(&req->rq_pin); in xprt_pin_rqst()
1105 * xprt_unpin_rqst - Unpin a request on the transport receive list
1108 * Caller should be holding xprt->queue_lock.
1112 if (!test_bit(RPC_TASK_MSG_PIN_WAIT, &req->rq_task->tk_runstate)) { in xprt_unpin_rqst()
1113 atomic_dec(&req->rq_pin); in xprt_unpin_rqst()
1116 if (atomic_dec_and_test(&req->rq_pin)) in xprt_unpin_rqst()
1117 wake_up_var(&req->rq_pin); in xprt_unpin_rqst()
1123 wait_var_event(&req->rq_pin, !xprt_is_pinned_rqst(req)); in xprt_wait_on_pinned_rqst()
1129 return !test_bit(RPC_TASK_NEED_RECV, &task->tk_runstate) && in xprt_request_data_received()
1130 READ_ONCE(task->tk_rqstp->rq_reply_bytes_recvd) != 0; in xprt_request_data_received()
1136 return !test_bit(RPC_TASK_NEED_RECV, &task->tk_runstate) && in xprt_request_need_enqueue_receive()
1137 READ_ONCE(task->tk_rqstp->rq_reply_bytes_recvd) == 0; in xprt_request_need_enqueue_receive()
1141 * xprt_request_enqueue_receive - Add an request to the receive queue
1142 * @task: RPC task
1148 struct rpc_rqst *req = task->tk_rqstp; in xprt_request_enqueue_receive()
1149 struct rpc_xprt *xprt = req->rq_xprt; in xprt_request_enqueue_receive()
1152 if (!xprt_request_need_enqueue_receive(task, req)) in xprt_request_enqueue_receive()
1155 ret = xprt_request_prepare(task->tk_rqstp, &req->rq_rcv_buf); in xprt_request_enqueue_receive()
1156 if (ret) in xprt_request_enqueue_receive()
1158 spin_lock(&xprt->queue_lock); in xprt_request_enqueue_receive()
1161 memcpy(&req->rq_private_buf, &req->rq_rcv_buf, in xprt_request_enqueue_receive()
1162 sizeof(req->rq_private_buf)); in xprt_request_enqueue_receive()
1166 set_bit(RPC_TASK_NEED_RECV, &task->tk_runstate); in xprt_request_enqueue_receive()
1167 spin_unlock(&xprt->queue_lock); in xprt_request_enqueue_receive()
1170 del_timer_sync(&xprt->timer); in xprt_request_enqueue_receive()
1175 * xprt_request_dequeue_receive_locked - Remove a request from the receive queue
1176 * @task: RPC task
1178 * Caller must hold xprt->queue_lock.
1183 struct rpc_rqst *req = task->tk_rqstp; in xprt_request_dequeue_receive_locked()
1185 if (test_and_clear_bit(RPC_TASK_NEED_RECV, &task->tk_runstate)) in xprt_request_dequeue_receive_locked()
1186 xprt_request_rb_remove(req->rq_xprt, req); in xprt_request_dequeue_receive_locked()
1190 * xprt_update_rtt - Update RPC RTT statistics
1191 * @task: RPC request that recently completed
1193 * Caller holds xprt->queue_lock.
1197 struct rpc_rqst *req = task->tk_rqstp; in xprt_update_rtt()
1198 struct rpc_rtt *rtt = task->tk_client->cl_rtt; in xprt_update_rtt()
1199 unsigned int timer = task->tk_msg.rpc_proc->p_timer; in xprt_update_rtt()
1200 long m = usecs_to_jiffies(ktime_to_us(req->rq_rtt)); in xprt_update_rtt()
1202 if (timer) { in xprt_update_rtt()
1203 if (req->rq_ntrans == 1) in xprt_update_rtt()
1205 rpc_set_timeo(rtt, timer, req->rq_ntrans - 1); in xprt_update_rtt()
1211 * xprt_complete_rqst - called when reply processing is complete
1212 * @task: RPC request that recently completed
1215 * Caller holds xprt->queue_lock.
1219 struct rpc_rqst *req = task->tk_rqstp; in xprt_complete_rqst()
1220 struct rpc_xprt *xprt = req->rq_xprt; in xprt_complete_rqst()
1222 xprt->stat.recvs++; in xprt_complete_rqst()
1224 xdr_free_bvec(&req->rq_rcv_buf); in xprt_complete_rqst()
1225 req->rq_private_buf.bvec = NULL; in xprt_complete_rqst()
1226 req->rq_private_buf.len = copied; in xprt_complete_rqst()
1228 /* req->rq_reply_bytes_recvd */ in xprt_complete_rqst()
1230 req->rq_reply_bytes_recvd = copied; in xprt_complete_rqst()
1232 rpc_wake_up_queued_task(&xprt->pending, task); in xprt_complete_rqst()
1238 struct rpc_rqst *req = task->tk_rqstp; in xprt_timer()
1239 struct rpc_xprt *xprt = req->rq_xprt; in xprt_timer()
1241 if (task->tk_status != -ETIMEDOUT) in xprt_timer()
1244 trace_xprt_timer(xprt, req->rq_xid, task->tk_status); in xprt_timer()
1245 if (!req->rq_reply_bytes_recvd) { in xprt_timer()
1246 if (xprt->ops->timer) in xprt_timer()
1247 xprt->ops->timer(xprt, task); in xprt_timer()
1249 task->tk_status = 0; in xprt_timer()
1253 * xprt_wait_for_reply_request_def - wait for reply
1258 * the retransmit timeout based on round-trip time estimation,
1263 struct rpc_rqst *req = task->tk_rqstp; in xprt_wait_for_reply_request_def()
1265 rpc_sleep_on_timeout(&req->rq_xprt->pending, task, xprt_timer, in xprt_wait_for_reply_request_def()
1271 * xprt_wait_for_reply_request_rtt - wait for reply using RTT estimator
1279 int timer = task->tk_msg.rpc_proc->p_timer; in xprt_wait_for_reply_request_rtt()
1280 struct rpc_clnt *clnt = task->tk_client; in xprt_wait_for_reply_request_rtt()
1281 struct rpc_rtt *rtt = clnt->cl_rtt; in xprt_wait_for_reply_request_rtt()
1282 struct rpc_rqst *req = task->tk_rqstp; in xprt_wait_for_reply_request_rtt()
1283 unsigned long max_timeout = clnt->cl_timeout->to_maxval; in xprt_wait_for_reply_request_rtt()
1287 timeout <<= rpc_ntimeo(rtt, timer) + req->rq_retries; in xprt_wait_for_reply_request_rtt()
1288 if (timeout > max_timeout || timeout == 0) in xprt_wait_for_reply_request_rtt()
1290 rpc_sleep_on_timeout(&req->rq_xprt->pending, task, xprt_timer, in xprt_wait_for_reply_request_rtt()
1296 * xprt_request_wait_receive - wait for the reply to an RPC request
1297 * @task: RPC task about to send a request
1302 struct rpc_rqst *req = task->tk_rqstp; in xprt_request_wait_receive()
1303 struct rpc_xprt *xprt = req->rq_xprt; in xprt_request_wait_receive()
1305 if (!test_bit(RPC_TASK_NEED_RECV, &task->tk_runstate)) in xprt_request_wait_receive()
1308 * Sleep on the pending queue if we're expecting a reply. in xprt_request_wait_receive()
1310 * req->rq_reply_bytes_recvd, and the call to rpc_sleep_on(). in xprt_request_wait_receive()
1312 spin_lock(&xprt->queue_lock); in xprt_request_wait_receive()
1313 if (test_bit(RPC_TASK_NEED_RECV, &task->tk_runstate)) { in xprt_request_wait_receive()
1314 xprt->ops->wait_for_reply_request(task); in xprt_request_wait_receive()
1316 * Send an extra queue wakeup call if the in xprt_request_wait_receive()
1320 if (xprt_request_retransmit_after_disconnect(task)) in xprt_request_wait_receive()
1321 rpc_wake_up_queued_task_set_status(&xprt->pending, in xprt_request_wait_receive()
1322 task, -ENOTCONN); in xprt_request_wait_receive()
1324 spin_unlock(&xprt->queue_lock); in xprt_request_wait_receive()
1330 return !test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate); in xprt_request_need_enqueue_transmit()
1334 * xprt_request_enqueue_transmit - queue a task for transmission
1342 struct rpc_rqst *pos, *req = task->tk_rqstp; in xprt_request_enqueue_transmit()
1343 struct rpc_xprt *xprt = req->rq_xprt; in xprt_request_enqueue_transmit()
1346 if (xprt_request_need_enqueue_transmit(task, req)) { in xprt_request_enqueue_transmit()
1347 ret = xprt_request_prepare(task->tk_rqstp, &req->rq_snd_buf); in xprt_request_enqueue_transmit()
1348 if (ret) { in xprt_request_enqueue_transmit()
1349 task->tk_status = ret; in xprt_request_enqueue_transmit()
1352 req->rq_bytes_sent = 0; in xprt_request_enqueue_transmit()
1353 spin_lock(&xprt->queue_lock); in xprt_request_enqueue_transmit()
1358 if (req->rq_cong) { in xprt_request_enqueue_transmit()
1360 list_for_each_entry(pos, &xprt->xmit_queue, rq_xmit) { in xprt_request_enqueue_transmit()
1361 if (pos->rq_cong) in xprt_request_enqueue_transmit()
1364 list_add_tail(&req->rq_xmit, &pos->rq_xmit); in xprt_request_enqueue_transmit()
1365 INIT_LIST_HEAD(&req->rq_xmit2); in xprt_request_enqueue_transmit()
1368 } else if (!req->rq_seqno) { in xprt_request_enqueue_transmit()
1369 list_for_each_entry(pos, &xprt->xmit_queue, rq_xmit) { in xprt_request_enqueue_transmit()
1370 if (pos->rq_task->tk_owner != task->tk_owner) in xprt_request_enqueue_transmit()
1372 list_add_tail(&req->rq_xmit2, &pos->rq_xmit2); in xprt_request_enqueue_transmit()
1373 INIT_LIST_HEAD(&req->rq_xmit); in xprt_request_enqueue_transmit()
1377 list_add_tail(&req->rq_xmit, &xprt->xmit_queue); in xprt_request_enqueue_transmit()
1378 INIT_LIST_HEAD(&req->rq_xmit2); in xprt_request_enqueue_transmit()
1380 atomic_long_inc(&xprt->xmit_queuelen); in xprt_request_enqueue_transmit()
1381 set_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate); in xprt_request_enqueue_transmit()
1382 spin_unlock(&xprt->queue_lock); in xprt_request_enqueue_transmit()
1387 * xprt_request_dequeue_transmit_locked - remove a task from the transmission queue
1391 * Caller must hold xprt->queue_lock
1396 struct rpc_rqst *req = task->tk_rqstp; in xprt_request_dequeue_transmit_locked()
1398 if (!test_and_clear_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate)) in xprt_request_dequeue_transmit_locked()
1400 if (!list_empty(&req->rq_xmit)) { in xprt_request_dequeue_transmit_locked()
1401 list_del(&req->rq_xmit); in xprt_request_dequeue_transmit_locked()
1402 if (!list_empty(&req->rq_xmit2)) { in xprt_request_dequeue_transmit_locked()
1403 struct rpc_rqst *next = list_first_entry(&req->rq_xmit2, in xprt_request_dequeue_transmit_locked()
1405 list_del(&req->rq_xmit2); in xprt_request_dequeue_transmit_locked()
1406 list_add_tail(&next->rq_xmit, &next->rq_xprt->xmit_queue); in xprt_request_dequeue_transmit_locked()
1409 list_del(&req->rq_xmit2); in xprt_request_dequeue_transmit_locked()
1410 atomic_long_dec(&req->rq_xprt->xmit_queuelen); in xprt_request_dequeue_transmit_locked()
1411 xdr_free_bvec(&req->rq_snd_buf); in xprt_request_dequeue_transmit_locked()
1415 * xprt_request_dequeue_transmit - remove a task from the transmission queue
1423 struct rpc_rqst *req = task->tk_rqstp; in xprt_request_dequeue_transmit()
1424 struct rpc_xprt *xprt = req->rq_xprt; in xprt_request_dequeue_transmit()
1426 spin_lock(&xprt->queue_lock); in xprt_request_dequeue_transmit()
1428 spin_unlock(&xprt->queue_lock); in xprt_request_dequeue_transmit()
1432 * xprt_request_dequeue_xprt - remove a task from the transmit+receive queue
1441 struct rpc_rqst *req = task->tk_rqstp; in xprt_request_dequeue_xprt()
1442 struct rpc_xprt *xprt = req->rq_xprt; in xprt_request_dequeue_xprt()
1444 if (test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate) || in xprt_request_dequeue_xprt()
1445 test_bit(RPC_TASK_NEED_RECV, &task->tk_runstate) || in xprt_request_dequeue_xprt()
1447 spin_lock(&xprt->queue_lock); in xprt_request_dequeue_xprt()
1449 set_bit(RPC_TASK_MSG_PIN_WAIT, &task->tk_runstate); in xprt_request_dequeue_xprt()
1450 spin_unlock(&xprt->queue_lock); in xprt_request_dequeue_xprt()
1452 spin_lock(&xprt->queue_lock); in xprt_request_dequeue_xprt()
1453 clear_bit(RPC_TASK_MSG_PIN_WAIT, &task->tk_runstate); in xprt_request_dequeue_xprt()
1457 spin_unlock(&xprt->queue_lock); in xprt_request_dequeue_xprt()
1458 xdr_free_bvec(&req->rq_rcv_buf); in xprt_request_dequeue_xprt()
1463 * xprt_request_prepare - prepare an encoded request for transport
1474 struct rpc_xprt *xprt = req->rq_xprt; in xprt_request_prepare()
1476 if (xprt->ops->prepare_request) in xprt_request_prepare()
1477 return xprt->ops->prepare_request(req, buf); in xprt_request_prepare()
1482 * xprt_request_need_retransmit - Test if a task needs retransmission
1494 * xprt_prepare_transmit - reserve the transport before sending a request
1495 * @task: RPC task about to send a request
1500 struct rpc_rqst *req = task->tk_rqstp; in xprt_prepare_transmit()
1501 struct rpc_xprt *xprt = req->rq_xprt; in xprt_prepare_transmit()
1503 if (!xprt_lock_write(xprt, task)) { in xprt_prepare_transmit()
1505 if (!test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate)) in xprt_prepare_transmit()
1506 rpc_wake_up_queued_task_set_status(&xprt->sending, in xprt_prepare_transmit()
1511 if (atomic_read(&xprt->swapper)) in xprt_prepare_transmit()
1513 current->flags |= PF_MEMALLOC; in xprt_prepare_transmit()
1519 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; in xprt_end_transmit()
1526 * xprt_request_transmit - send an RPC request on a transport
1528 * @snd_task: RPC task that owns the transport lock
1531 * Note that if the request is not the same as snd_task, then it
1538 struct rpc_xprt *xprt = req->rq_xprt; in xprt_request_transmit()
1539 struct rpc_task *task = req->rq_task; in xprt_request_transmit()
1544 if (!req->rq_bytes_sent) { in xprt_request_transmit()
1545 if (xprt_request_data_received(task)) { in xprt_request_transmit()
1550 if (rpcauth_xmit_need_reencode(task)) { in xprt_request_transmit()
1551 status = -EBADMSG; in xprt_request_transmit()
1554 if (RPC_SIGNALLED(task)) { in xprt_request_transmit()
1555 status = -ERESTARTSYS; in xprt_request_transmit()
1561 * Update req->rq_ntrans before transmitting to avoid races with in xprt_request_transmit()
1565 req->rq_ntrans++; in xprt_request_transmit()
1567 trace_rpc_xdr_sendto(task, &req->rq_snd_buf); in xprt_request_transmit()
1568 connect_cookie = xprt->connect_cookie; in xprt_request_transmit()
1569 status = xprt->ops->send_request(req); in xprt_request_transmit()
1570 if (status != 0) { in xprt_request_transmit()
1571 req->rq_ntrans--; in xprt_request_transmit()
1576 if (is_retrans) { in xprt_request_transmit()
1577 task->tk_client->cl_stats->rpcretrans++; in xprt_request_transmit()
1583 task->tk_flags |= RPC_TASK_SENT; in xprt_request_transmit()
1584 spin_lock(&xprt->transport_lock); in xprt_request_transmit()
1586 xprt->stat.sends++; in xprt_request_transmit()
1587 xprt->stat.req_u += xprt->stat.sends - xprt->stat.recvs; in xprt_request_transmit()
1588 xprt->stat.bklog_u += xprt->backlog.qlen; in xprt_request_transmit()
1589 xprt->stat.sending_u += xprt->sending.qlen; in xprt_request_transmit()
1590 xprt->stat.pending_u += xprt->pending.qlen; in xprt_request_transmit()
1591 spin_unlock(&xprt->transport_lock); in xprt_request_transmit()
1593 req->rq_connect_cookie = connect_cookie; in xprt_request_transmit()
1597 rpc_wake_up_queued_task_set_status(&xprt->sending, task, status); in xprt_request_transmit()
1602 * xprt_transmit - send an RPC request on a transport
1603 * @task: controlling RPC task
1613 struct rpc_rqst *next, *req = task->tk_rqstp; in xprt_transmit()
1614 struct rpc_xprt *xprt = req->rq_xprt; in xprt_transmit()
1617 spin_lock(&xprt->queue_lock); in xprt_transmit()
1619 next = list_first_entry_or_null(&xprt->xmit_queue, in xprt_transmit()
1621 if (!next) in xprt_transmit()
1624 spin_unlock(&xprt->queue_lock); in xprt_transmit()
1626 if (status == -EBADMSG && next != req) in xprt_transmit()
1628 spin_lock(&xprt->queue_lock); in xprt_transmit()
1630 if (status < 0) { in xprt_transmit()
1631 if (test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate)) in xprt_transmit()
1632 task->tk_status = status; in xprt_transmit()
1636 if (xprt_request_data_received(task) && in xprt_transmit()
1637 !test_bit(RPC_TASK_NEED_XMIT, &task->tk_runstate)) in xprt_transmit()
1639 cond_resched_lock(&xprt->queue_lock); in xprt_transmit()
1641 spin_unlock(&xprt->queue_lock); in xprt_transmit()
1646 if (task->tk_rqstp) in xprt_complete_request_init()
1652 set_bit(XPRT_CONGESTED, &xprt->state); in xprt_add_backlog()
1653 rpc_sleep_on(&xprt->backlog, task, xprt_complete_request_init); in xprt_add_backlog()
1661 if (task->tk_rqstp == NULL) { in __xprt_set_rq()
1663 task->tk_rqstp = req; in __xprt_set_rq()
1671 if (rpc_wake_up_first(&xprt->backlog, __xprt_set_rq, req) == NULL) { in xprt_wake_up_backlog()
1672 clear_bit(XPRT_CONGESTED, &xprt->state); in xprt_wake_up_backlog()
1683 if (!test_bit(XPRT_CONGESTED, &xprt->state)) in xprt_throttle_congested()
1685 spin_lock(&xprt->reserve_lock); in xprt_throttle_congested()
1686 if (test_bit(XPRT_CONGESTED, &xprt->state)) { in xprt_throttle_congested()
1690 spin_unlock(&xprt->reserve_lock); in xprt_throttle_congested()
1697 struct rpc_rqst *req = ERR_PTR(-EAGAIN); in xprt_dynamic_alloc_slot()
1699 if (xprt->num_reqs >= xprt->max_reqs) in xprt_dynamic_alloc_slot()
1701 ++xprt->num_reqs; in xprt_dynamic_alloc_slot()
1702 spin_unlock(&xprt->reserve_lock); in xprt_dynamic_alloc_slot()
1704 spin_lock(&xprt->reserve_lock); in xprt_dynamic_alloc_slot()
1705 if (req != NULL) in xprt_dynamic_alloc_slot()
1707 --xprt->num_reqs; in xprt_dynamic_alloc_slot()
1708 req = ERR_PTR(-ENOMEM); in xprt_dynamic_alloc_slot()
1715 if (xprt->num_reqs > xprt->min_reqs) { in xprt_dynamic_free_slot()
1716 --xprt->num_reqs; in xprt_dynamic_free_slot()
1727 spin_lock(&xprt->reserve_lock); in xprt_alloc_slot()
1728 if (!list_empty(&xprt->free)) { in xprt_alloc_slot()
1729 req = list_entry(xprt->free.next, struct rpc_rqst, rq_list); in xprt_alloc_slot()
1730 list_del(&req->rq_list); in xprt_alloc_slot()
1734 if (!IS_ERR(req)) in xprt_alloc_slot()
1737 case -ENOMEM: in xprt_alloc_slot()
1738 dprintk("RPC: dynamic allocation of request slot " in xprt_alloc_slot()
1740 task->tk_status = -ENOMEM; in xprt_alloc_slot()
1742 case -EAGAIN: in xprt_alloc_slot()
1744 dprintk("RPC: waiting for request slot\n"); in xprt_alloc_slot()
1747 task->tk_status = -EAGAIN; in xprt_alloc_slot()
1749 spin_unlock(&xprt->reserve_lock); in xprt_alloc_slot()
1752 xprt->stat.max_slots = max_t(unsigned int, xprt->stat.max_slots, in xprt_alloc_slot()
1753 xprt->num_reqs); in xprt_alloc_slot()
1754 spin_unlock(&xprt->reserve_lock); in xprt_alloc_slot()
1756 task->tk_status = 0; in xprt_alloc_slot()
1757 task->tk_rqstp = req; in xprt_alloc_slot()
1763 spin_lock(&xprt->reserve_lock); in xprt_free_slot()
1764 if (!xprt_wake_up_backlog(xprt, req) && in xprt_free_slot()
1767 list_add(&req->rq_list, &xprt->free); in xprt_free_slot()
1769 spin_unlock(&xprt->reserve_lock); in xprt_free_slot()
1776 while (!list_empty(&xprt->free)) { in xprt_free_all_slots()
1777 req = list_first_entry(&xprt->free, struct rpc_rqst, rq_list); in xprt_free_all_slots()
1778 list_del(&req->rq_list); in xprt_free_all_slots()
1795 if (id < 0) in xprt_alloc_id()
1798 xprt->id = id; in xprt_alloc_id()
1804 ida_free(&rpc_xprt_ids, xprt->id); in xprt_free_id()
1816 if (xprt == NULL) in xprt_alloc()
1824 if (!req) in xprt_alloc()
1826 list_add(&req->rq_list, &xprt->free); in xprt_alloc()
1828 xprt->max_reqs = max_t(unsigned int, max_alloc, num_prealloc); in xprt_alloc()
1829 xprt->min_reqs = num_prealloc; in xprt_alloc()
1830 xprt->num_reqs = num_prealloc; in xprt_alloc()
1843 put_net_track(xprt->xprt_net, &xprt->ns_tracker); in xprt_free()
1854 req->rq_connect_cookie = xprt_connect_cookie(xprt) - 1; in xprt_init_connect_cookie()
1862 spin_lock(&xprt->reserve_lock); in xprt_alloc_xid()
1863 xid = (__force __be32)xprt->xid++; in xprt_alloc_xid()
1864 spin_unlock(&xprt->reserve_lock); in xprt_alloc_xid()
1871 xprt->xid = get_random_u32(); in xprt_init_xid()
1877 struct rpc_xprt *xprt = task->tk_xprt; in xprt_request_init()
1878 struct rpc_rqst *req = task->tk_rqstp; in xprt_request_init()
1880 req->rq_task = task; in xprt_request_init()
1881 req->rq_xprt = xprt; in xprt_request_init()
1882 req->rq_buffer = NULL; in xprt_request_init()
1883 req->rq_xid = xprt_alloc_xid(xprt); in xprt_request_init()
1885 req->rq_snd_buf.len = 0; in xprt_request_init()
1886 req->rq_snd_buf.buflen = 0; in xprt_request_init()
1887 req->rq_rcv_buf.len = 0; in xprt_request_init()
1888 req->rq_rcv_buf.buflen = 0; in xprt_request_init()
1889 req->rq_snd_buf.bvec = NULL; in xprt_request_init()
1890 req->rq_rcv_buf.bvec = NULL; in xprt_request_init()
1891 req->rq_release_snd_buf = NULL; in xprt_request_init()
1892 xprt_init_majortimeo(task, req, task->tk_client->cl_timeout); in xprt_request_init()
1900 xprt->ops->alloc_slot(xprt, task); in xprt_do_reserve()
1901 if (task->tk_rqstp != NULL) in xprt_do_reserve()
1906 * xprt_reserve - allocate an RPC request slot
1907 * @task: RPC task requesting a slot allocation
1909 * If the transport is marked as being congested, or if no more
1915 struct rpc_xprt *xprt = task->tk_xprt; in xprt_reserve()
1917 task->tk_status = 0; in xprt_reserve()
1918 if (task->tk_rqstp != NULL) in xprt_reserve()
1921 task->tk_status = -EAGAIN; in xprt_reserve()
1922 if (!xprt_throttle_congested(xprt, task)) in xprt_reserve()
1927 * xprt_retry_reserve - allocate an RPC request slot
1928 * @task: RPC task requesting a slot allocation
1930 * If no more slots are available, place the task on the transport's
1937 struct rpc_xprt *xprt = task->tk_xprt; in xprt_retry_reserve()
1939 task->tk_status = 0; in xprt_retry_reserve()
1940 if (task->tk_rqstp != NULL) in xprt_retry_reserve()
1943 task->tk_status = -EAGAIN; in xprt_retry_reserve()
1948 * xprt_release - release an RPC request slot
1955 struct rpc_rqst *req = task->tk_rqstp; in xprt_release()
1957 if (req == NULL) { in xprt_release()
1958 if (task->tk_client) { in xprt_release()
1959 xprt = task->tk_xprt; in xprt_release()
1965 xprt = req->rq_xprt; in xprt_release()
1967 spin_lock(&xprt->transport_lock); in xprt_release()
1968 xprt->ops->release_xprt(xprt, task); in xprt_release()
1969 if (xprt->ops->release_request) in xprt_release()
1970 xprt->ops->release_request(task); in xprt_release()
1972 spin_unlock(&xprt->transport_lock); in xprt_release()
1973 if (req->rq_buffer) in xprt_release()
1974 xprt->ops->buf_free(task); in xprt_release()
1975 if (req->rq_cred != NULL) in xprt_release()
1976 put_rpccred(req->rq_cred); in xprt_release()
1977 if (req->rq_release_snd_buf) in xprt_release()
1978 req->rq_release_snd_buf(req); in xprt_release()
1980 task->tk_rqstp = NULL; in xprt_release()
1981 if (likely(!bc_prealloc(req))) in xprt_release()
1982 xprt->ops->free_slot(xprt, req); in xprt_release()
1992 struct xdr_buf *xbufp = &req->rq_snd_buf; in xprt_init_bc_request()
1994 task->tk_rqstp = req; in xprt_init_bc_request()
1995 req->rq_task = task; in xprt_init_bc_request()
1996 xprt_init_connect_cookie(req, req->rq_xprt); in xprt_init_bc_request()
2001 xbufp->len = xbufp->head[0].iov_len + xbufp->page_len + in xprt_init_bc_request()
2002 xbufp->tail[0].iov_len; in xprt_init_bc_request()
2015 kref_init(&xprt->kref); in xprt_init()
2017 spin_lock_init(&xprt->transport_lock); in xprt_init()
2018 spin_lock_init(&xprt->reserve_lock); in xprt_init()
2019 spin_lock_init(&xprt->queue_lock); in xprt_init()
2021 INIT_LIST_HEAD(&xprt->free); in xprt_init()
2022 xprt->recv_queue = RB_ROOT; in xprt_init()
2023 INIT_LIST_HEAD(&xprt->xmit_queue); in xprt_init()
2024 #if defined(CONFIG_SUNRPC_BACKCHANNEL) in xprt_init()
2025 spin_lock_init(&xprt->bc_pa_lock); in xprt_init()
2026 INIT_LIST_HEAD(&xprt->bc_pa_list); in xprt_init()
2028 INIT_LIST_HEAD(&xprt->xprt_switch); in xprt_init()
2030 xprt->last_used = jiffies; in xprt_init()
2031 xprt->cwnd = RPC_INITCWND; in xprt_init()
2032 xprt->bind_index = 0; in xprt_init()
2034 rpc_init_wait_queue(&xprt->binding, "xprt_binding"); in xprt_init()
2035 rpc_init_wait_queue(&xprt->pending, "xprt_pending"); in xprt_init()
2036 rpc_init_wait_queue(&xprt->sending, "xprt_sending"); in xprt_init()
2037 rpc_init_priority_wait_queue(&xprt->backlog, "xprt_backlog"); in xprt_init()
2041 xprt->xprt_net = get_net_track(net, &xprt->ns_tracker, GFP_KERNEL); in xprt_init()
2045 * xprt_create_transport - create an RPC transport
2046 * @args: rpc transport creation arguments
2054 t = xprt_class_find_by_ident(args->ident); in xprt_create_transport()
2055 if (!t) { in xprt_create_transport()
2056 dprintk("RPC: transport (%d) not supported\n", args->ident); in xprt_create_transport()
2057 return ERR_PTR(-EIO); in xprt_create_transport()
2060 xprt = t->setup(args); in xprt_create_transport()
2063 if (IS_ERR(xprt)) in xprt_create_transport()
2065 if (args->flags & XPRT_CREATE_NO_IDLE_TIMEOUT) in xprt_create_transport()
2066 xprt->idle_timeout = 0; in xprt_create_transport()
2067 INIT_WORK(&xprt->task_cleanup, xprt_autoclose); in xprt_create_transport()
2068 if (xprt_has_timer(xprt)) in xprt_create_transport()
2069 timer_setup(&xprt->timer, xprt_init_autodisconnect, 0); in xprt_create_transport()
2071 timer_setup(&xprt->timer, NULL, 0); in xprt_create_transport()
2073 if (strlen(args->servername) > RPC_MAXNETNAMELEN) { in xprt_create_transport()
2075 return ERR_PTR(-EINVAL); in xprt_create_transport()
2077 xprt->servername = kstrdup(args->servername, GFP_KERNEL); in xprt_create_transport()
2078 if (xprt->servername == NULL) { in xprt_create_transport()
2080 return ERR_PTR(-ENOMEM); in xprt_create_transport()
2098 rpc_destroy_wait_queue(&xprt->binding); in xprt_destroy_cb()
2099 rpc_destroy_wait_queue(&xprt->pending); in xprt_destroy_cb()
2100 rpc_destroy_wait_queue(&xprt->sending); in xprt_destroy_cb()
2101 rpc_destroy_wait_queue(&xprt->backlog); in xprt_destroy_cb()
2102 kfree(xprt->servername); in xprt_destroy_cb()
2111 xprt->ops->destroy(xprt); in xprt_destroy_cb()
2115 * xprt_destroy - destroy an RPC transport, killing off all requests.
2124 wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_UNINTERRUPTIBLE); in xprt_destroy()
2128 * is cleared. We use ->transport_lock to ensure the mod_timer() in xprt_destroy()
2131 spin_lock(&xprt->transport_lock); in xprt_destroy()
2132 del_timer_sync(&xprt->timer); in xprt_destroy()
2133 spin_unlock(&xprt->transport_lock); in xprt_destroy()
2139 INIT_WORK(&xprt->task_cleanup, xprt_destroy_cb); in xprt_destroy()
2140 schedule_work(&xprt->task_cleanup); in xprt_destroy()
2149 * xprt_get - return a reference to an RPC transport.
2155 if (xprt != NULL && kref_get_unless_zero(&xprt->kref)) in xprt_get()
2162 * xprt_put - release a reference to an RPC transport.
2168 if (xprt != NULL) in xprt_put()
2169 kref_put(&xprt->kref, xprt_destroy_kref); in xprt_put()
2175 if (!test_and_set_bit(XPRT_OFFLINE, &xprt->state)) { in xprt_set_offline_locked()
2176 spin_lock(&xps->xps_lock); in xprt_set_offline_locked()
2177 xps->xps_nactive--; in xprt_set_offline_locked()
2178 spin_unlock(&xps->xps_lock); in xprt_set_offline_locked()
2184 if (test_and_clear_bit(XPRT_OFFLINE, &xprt->state)) { in xprt_set_online_locked()
2185 spin_lock(&xps->xps_lock); in xprt_set_online_locked()
2186 xps->xps_nactive++; in xprt_set_online_locked()
2187 spin_unlock(&xps->xps_lock); in xprt_set_online_locked()
2193 if (test_and_set_bit(XPRT_REMOVE, &xprt->state)) in xprt_delete_locked()
2197 if (!test_bit(XPRT_CONNECTED, &xprt->state)) in xprt_delete_locked()
2200 if (!xprt->sending.qlen && !xprt->pending.qlen && in xprt_delete_locked()
2201 !xprt->backlog.qlen && !atomic_long_read(&xprt->queuelen)) in xprt_delete_locked()