Lines Matching +full:rpc +full:- +full:if
4 * This is a generic RPC call interface supporting congestion avoidance,
9 * - When a process places a call, it allocates a request slot if
12 * - Next, the caller puts together the RPC message, stuffs it into
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,
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
21 * - When no reply arrives within the timeout interval, the timer is
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
31 * Support for async RPC is done through a set of RPC-specific scheduling
35 * Copyright (C) 1995-1997, Olaf Kirch <okir@monad.swb.de>
61 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
79 * xprt_register_transport - register a transport implementation
82 * If a transport implementation is loaded as a kernel module, it can
83 * call this interface to make itself known to the RPC client.
87 * -EEXIST: transport already registered
88 * -EINVAL: transport module being unloaded
95 result = -EEXIST; in xprt_register_transport()
99 if (t->ident == transport->ident) in xprt_register_transport()
103 list_add_tail(&transport->list, &xprt_list); in xprt_register_transport()
104 printk(KERN_INFO "RPC: Registered %s transport module.\n", in xprt_register_transport()
105 transport->name); in xprt_register_transport()
115 * xprt_unregister_transport - unregister a transport implementation
120 * -ENOENT: transport never registered
130 if (t == transport) { in xprt_unregister_transport()
132 "RPC: Unregistered %s transport module.\n", in xprt_unregister_transport()
133 transport->name); in xprt_unregister_transport()
134 list_del_init(&transport->list); in xprt_unregister_transport()
138 result = -ENOENT; in xprt_unregister_transport()
147 * xprt_load_transport - load a transport implementation
152 * -ENOENT: transport module not available
162 if (strcmp(t->name, transport_name) == 0) { in xprt_load_transport()
175 * xprt_reserve_xprt - serialize write access to transports
185 struct rpc_rqst *req = task->tk_rqstp; in xprt_reserve_xprt()
188 if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { in xprt_reserve_xprt()
189 if (task == xprt->snd_task) in xprt_reserve_xprt()
193 xprt->snd_task = task; in xprt_reserve_xprt()
194 if (req != NULL) in xprt_reserve_xprt()
195 req->rq_ntrans++; in xprt_reserve_xprt()
200 dprintk("RPC: %5u failed to lock transport %p\n", in xprt_reserve_xprt()
201 task->tk_pid, xprt); in xprt_reserve_xprt()
202 task->tk_timeout = 0; in xprt_reserve_xprt()
203 task->tk_status = -EAGAIN; in xprt_reserve_xprt()
204 if (req == NULL) in xprt_reserve_xprt()
206 else if (!req->rq_ntrans) in xprt_reserve_xprt()
210 rpc_sleep_on_priority(&xprt->sending, task, NULL, priority); in xprt_reserve_xprt()
217 xprt->snd_task = NULL; in xprt_clear_locked()
218 if (!test_bit(XPRT_CLOSE_WAIT, &xprt->state)) { in xprt_clear_locked()
220 clear_bit(XPRT_LOCKED, &xprt->state); in xprt_clear_locked()
223 queue_work(xprtiod_workqueue, &xprt->task_cleanup); in xprt_clear_locked()
227 * xprt_reserve_xprt_cong - serialize write access to transports
236 struct rpc_rqst *req = task->tk_rqstp; in xprt_reserve_xprt_cong()
239 if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) { in xprt_reserve_xprt_cong()
240 if (task == xprt->snd_task) in xprt_reserve_xprt_cong()
244 if (req == NULL) { in xprt_reserve_xprt_cong()
245 xprt->snd_task = task; in xprt_reserve_xprt_cong()
248 if (__xprt_get_cong(xprt, task)) { in xprt_reserve_xprt_cong()
249 xprt->snd_task = task; in xprt_reserve_xprt_cong()
250 req->rq_ntrans++; in xprt_reserve_xprt_cong()
255 if (req) in xprt_reserve_xprt_cong()
257 dprintk("RPC: %5u failed to lock transport %p\n", task->tk_pid, xprt); in xprt_reserve_xprt_cong()
258 task->tk_timeout = 0; in xprt_reserve_xprt_cong()
259 task->tk_status = -EAGAIN; in xprt_reserve_xprt_cong()
260 if (req == NULL) in xprt_reserve_xprt_cong()
262 else if (!req->rq_ntrans) in xprt_reserve_xprt_cong()
266 rpc_sleep_on_priority(&xprt->sending, task, NULL, priority); in xprt_reserve_xprt_cong()
275 spin_lock_bh(&xprt->transport_lock); in xprt_lock_write()
276 retval = xprt->ops->reserve_xprt(xprt, task); in xprt_lock_write()
277 spin_unlock_bh(&xprt->transport_lock); in xprt_lock_write()
286 req = task->tk_rqstp; in __xprt_lock_write_func()
287 xprt->snd_task = task; in __xprt_lock_write_func()
288 if (req) in __xprt_lock_write_func()
289 req->rq_ntrans++; in __xprt_lock_write_func()
295 if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) in __xprt_lock_write_next()
298 if (rpc_wake_up_first_on_wq(xprtiod_workqueue, &xprt->sending, in __xprt_lock_write_next()
309 req = task->tk_rqstp; in __xprt_lock_write_cong_func()
310 if (req == NULL) { in __xprt_lock_write_cong_func()
311 xprt->snd_task = task; in __xprt_lock_write_cong_func()
314 if (__xprt_get_cong(xprt, task)) { in __xprt_lock_write_cong_func()
315 xprt->snd_task = task; in __xprt_lock_write_cong_func()
316 req->rq_ntrans++; in __xprt_lock_write_cong_func()
324 if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) in __xprt_lock_write_next_cong()
326 if (RPCXPRT_CONGESTED(xprt)) in __xprt_lock_write_next_cong()
328 if (rpc_wake_up_first_on_wq(xprtiod_workqueue, &xprt->sending, in __xprt_lock_write_next_cong()
337 if (task != NULL) { in xprt_task_clear_bytes_sent()
338 struct rpc_rqst *req = task->tk_rqstp; in xprt_task_clear_bytes_sent()
339 if (req != NULL) in xprt_task_clear_bytes_sent()
340 req->rq_bytes_sent = 0; in xprt_task_clear_bytes_sent()
345 * xprt_release_xprt - allow other requests to use a transport
353 if (xprt->snd_task == task) { in xprt_release_xprt()
362 * xprt_release_xprt_cong - allow other requests to use a transport
367 * transport if the transport's congestion window allows it.
371 if (xprt->snd_task == task) { in xprt_release_xprt_cong()
381 spin_lock_bh(&xprt->transport_lock); in xprt_release_write()
382 xprt->ops->release_xprt(xprt, task); in xprt_release_write()
383 spin_unlock_bh(&xprt->transport_lock); in xprt_release_write()
387 * Van Jacobson congestion avoidance. Check if the congestion window
388 * overflowed. Put the task to sleep if this is the case.
393 struct rpc_rqst *req = task->tk_rqstp; in __xprt_get_cong()
395 if (req->rq_cong) in __xprt_get_cong()
397 dprintk("RPC: %5u xprt_cwnd_limited cong = %lu cwnd = %lu\n", in __xprt_get_cong()
398 task->tk_pid, xprt->cong, xprt->cwnd); in __xprt_get_cong()
399 if (RPCXPRT_CONGESTED(xprt)) in __xprt_get_cong()
401 req->rq_cong = 1; in __xprt_get_cong()
402 xprt->cong += RPC_CWNDSCALE; in __xprt_get_cong()
413 if (!req->rq_cong) in __xprt_put_cong()
415 req->rq_cong = 0; in __xprt_put_cong()
416 xprt->cong -= RPC_CWNDSCALE; in __xprt_put_cong()
421 * xprt_release_rqst_cong - housekeeping when request is complete
422 * @task: RPC request that recently completed
428 struct rpc_rqst *req = task->tk_rqstp; in xprt_release_rqst_cong()
430 __xprt_put_cong(req->rq_xprt, req); in xprt_release_rqst_cong()
435 * xprt_adjust_cwnd - adjust transport congestion window
437 * @task: recently completed RPC request used to adjust window
438 * @result: result code of completed RPC request
440 * The transport code maintains an estimate on the maximum number of out-
441 * standing RPC requests, using a smoothed version of the congestion
443 * congestion algorithm: If a retransmit occurs, the congestion window is
446 * - a reply is received and
447 * - a full number of requests are outstanding and
448 * - the congestion window hasn't been updated recently.
452 struct rpc_rqst *req = task->tk_rqstp; in xprt_adjust_cwnd()
453 unsigned long cwnd = xprt->cwnd; in xprt_adjust_cwnd()
455 if (result >= 0 && cwnd <= xprt->cong) { in xprt_adjust_cwnd()
459 if (cwnd > RPC_MAXCWND(xprt)) in xprt_adjust_cwnd()
462 } else if (result == -ETIMEDOUT) { in xprt_adjust_cwnd()
464 if (cwnd < RPC_CWNDSCALE) in xprt_adjust_cwnd()
467 dprintk("RPC: cong %ld, cwnd was %ld, now %ld\n", in xprt_adjust_cwnd()
468 xprt->cong, xprt->cwnd, cwnd); in xprt_adjust_cwnd()
469 xprt->cwnd = cwnd; in xprt_adjust_cwnd()
475 * xprt_wake_pending_tasks - wake all tasks on a transport's pending queue
482 if (status < 0) in xprt_wake_pending_tasks()
483 rpc_wake_up_status(&xprt->pending, status); in xprt_wake_pending_tasks()
485 rpc_wake_up(&xprt->pending); in xprt_wake_pending_tasks()
490 * xprt_wait_for_buffer_space - wait for transport output buffer to clear
496 * an incomplete RPC call transmission.
500 struct rpc_rqst *req = task->tk_rqstp; in xprt_wait_for_buffer_space()
501 struct rpc_xprt *xprt = req->rq_xprt; in xprt_wait_for_buffer_space()
503 task->tk_timeout = RPC_IS_SOFT(task) ? req->rq_timeout : 0; in xprt_wait_for_buffer_space()
504 rpc_sleep_on(&xprt->pending, task, action); in xprt_wait_for_buffer_space()
509 * xprt_write_space - wake the task waiting for transport output buffer space
516 spin_lock_bh(&xprt->transport_lock); in xprt_write_space()
517 if (xprt->snd_task) { in xprt_write_space()
518 dprintk("RPC: write space: waking waiting task on " in xprt_write_space()
521 &xprt->pending, xprt->snd_task); in xprt_write_space()
523 spin_unlock_bh(&xprt->transport_lock); in xprt_write_space()
528 * xprt_set_retrans_timeout_def - set a request's retransmit timeout
533 * the retransmit timeout based on round-trip time estimation.
537 task->tk_timeout = task->tk_rqstp->rq_timeout; in xprt_set_retrans_timeout_def()
542 * xprt_set_retrans_timeout_rtt - set a request's retransmit timeout
549 int timer = task->tk_msg.rpc_proc->p_timer; in xprt_set_retrans_timeout_rtt()
550 struct rpc_clnt *clnt = task->tk_client; in xprt_set_retrans_timeout_rtt()
551 struct rpc_rtt *rtt = clnt->cl_rtt; in xprt_set_retrans_timeout_rtt()
552 struct rpc_rqst *req = task->tk_rqstp; in xprt_set_retrans_timeout_rtt()
553 unsigned long max_timeout = clnt->cl_timeout->to_maxval; in xprt_set_retrans_timeout_rtt()
555 task->tk_timeout = rpc_calc_rto(rtt, timer); in xprt_set_retrans_timeout_rtt()
556 task->tk_timeout <<= rpc_ntimeo(rtt, timer) + req->rq_retries; in xprt_set_retrans_timeout_rtt()
557 if (task->tk_timeout > max_timeout || task->tk_timeout == 0) in xprt_set_retrans_timeout_rtt()
558 task->tk_timeout = max_timeout; in xprt_set_retrans_timeout_rtt()
564 const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout; in xprt_reset_majortimeo()
566 req->rq_majortimeo = req->rq_timeout; in xprt_reset_majortimeo()
567 if (to->to_exponential) in xprt_reset_majortimeo()
568 req->rq_majortimeo <<= to->to_retries; in xprt_reset_majortimeo()
570 req->rq_majortimeo += to->to_increment * to->to_retries; in xprt_reset_majortimeo()
571 if (req->rq_majortimeo > to->to_maxval || req->rq_majortimeo == 0) in xprt_reset_majortimeo()
572 req->rq_majortimeo = to->to_maxval; in xprt_reset_majortimeo()
573 req->rq_majortimeo += jiffies; in xprt_reset_majortimeo()
577 * xprt_adjust_timeout - adjust timeout values for next retransmit
578 * @req: RPC request containing parameters to use for the adjustment
583 struct rpc_xprt *xprt = req->rq_xprt; in xprt_adjust_timeout()
584 const struct rpc_timeout *to = req->rq_task->tk_client->cl_timeout; in xprt_adjust_timeout()
587 if (time_before(jiffies, req->rq_majortimeo)) { in xprt_adjust_timeout()
588 if (to->to_exponential) in xprt_adjust_timeout()
589 req->rq_timeout <<= 1; in xprt_adjust_timeout()
591 req->rq_timeout += to->to_increment; in xprt_adjust_timeout()
592 if (to->to_maxval && req->rq_timeout >= to->to_maxval) in xprt_adjust_timeout()
593 req->rq_timeout = to->to_maxval; in xprt_adjust_timeout()
594 req->rq_retries++; in xprt_adjust_timeout()
596 req->rq_timeout = to->to_initval; in xprt_adjust_timeout()
597 req->rq_retries = 0; in xprt_adjust_timeout()
600 spin_lock_bh(&xprt->transport_lock); in xprt_adjust_timeout()
601 rpc_init_rtt(req->rq_task->tk_client->cl_rtt, to->to_initval); in xprt_adjust_timeout()
602 spin_unlock_bh(&xprt->transport_lock); in xprt_adjust_timeout()
603 status = -ETIMEDOUT; in xprt_adjust_timeout()
606 if (req->rq_timeout == 0) { in xprt_adjust_timeout()
608 req->rq_timeout = 5 * HZ; in xprt_adjust_timeout()
618 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); in xprt_autoclose()
619 xprt->ops->close(xprt); in xprt_autoclose()
621 wake_up_bit(&xprt->state, XPRT_LOCKED); in xprt_autoclose()
625 * xprt_disconnect_done - mark a transport as disconnected
631 dprintk("RPC: disconnected transport %p\n", xprt); in xprt_disconnect_done()
632 spin_lock_bh(&xprt->transport_lock); in xprt_disconnect_done()
634 xprt_wake_pending_tasks(xprt, -EAGAIN); in xprt_disconnect_done()
635 spin_unlock_bh(&xprt->transport_lock); in xprt_disconnect_done()
640 * xprt_force_disconnect - force a transport to disconnect
647 spin_lock_bh(&xprt->transport_lock); in xprt_force_disconnect()
648 set_bit(XPRT_CLOSE_WAIT, &xprt->state); in xprt_force_disconnect()
649 /* Try to schedule an autoclose RPC call */ in xprt_force_disconnect()
650 if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) in xprt_force_disconnect()
651 queue_work(xprtiod_workqueue, &xprt->task_cleanup); in xprt_force_disconnect()
652 xprt_wake_pending_tasks(xprt, -EAGAIN); in xprt_force_disconnect()
653 spin_unlock_bh(&xprt->transport_lock); in xprt_force_disconnect()
658 * xprt_conditional_disconnect - force a transport to disconnect
662 * This attempts to break the connection if and only if 'cookie' matches
665 * a batch of RPC requests.
671 spin_lock_bh(&xprt->transport_lock); in xprt_conditional_disconnect()
672 if (cookie != xprt->connect_cookie) in xprt_conditional_disconnect()
674 if (test_bit(XPRT_CLOSING, &xprt->state)) in xprt_conditional_disconnect()
676 set_bit(XPRT_CLOSE_WAIT, &xprt->state); in xprt_conditional_disconnect()
677 /* Try to schedule an autoclose RPC call */ in xprt_conditional_disconnect()
678 if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) in xprt_conditional_disconnect()
679 queue_work(xprtiod_workqueue, &xprt->task_cleanup); in xprt_conditional_disconnect()
680 xprt_wake_pending_tasks(xprt, -EAGAIN); in xprt_conditional_disconnect()
682 spin_unlock_bh(&xprt->transport_lock); in xprt_conditional_disconnect()
688 return xprt->idle_timeout != 0; in xprt_has_timer()
693 __must_hold(&xprt->transport_lock) in xprt_schedule_autodisconnect()
695 if (list_empty(&xprt->recv) && xprt_has_timer(xprt)) in xprt_schedule_autodisconnect()
696 mod_timer(&xprt->timer, xprt->last_used + xprt->idle_timeout); in xprt_schedule_autodisconnect()
704 spin_lock(&xprt->transport_lock); in xprt_init_autodisconnect()
705 if (!list_empty(&xprt->recv)) in xprt_init_autodisconnect()
707 /* Reset xprt->last_used to avoid connect/autodisconnect cycling */ in xprt_init_autodisconnect()
708 xprt->last_used = jiffies; in xprt_init_autodisconnect()
709 if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) in xprt_init_autodisconnect()
711 spin_unlock(&xprt->transport_lock); in xprt_init_autodisconnect()
712 queue_work(xprtiod_workqueue, &xprt->task_cleanup); in xprt_init_autodisconnect()
715 spin_unlock(&xprt->transport_lock); in xprt_init_autodisconnect()
724 spin_lock_bh(&xprt->transport_lock); in xprt_lock_connect()
725 if (!test_bit(XPRT_LOCKED, &xprt->state)) in xprt_lock_connect()
727 if (xprt->snd_task != task) in xprt_lock_connect()
730 xprt->snd_task = cookie; in xprt_lock_connect()
733 spin_unlock_bh(&xprt->transport_lock); in xprt_lock_connect()
739 spin_lock_bh(&xprt->transport_lock); in xprt_unlock_connect()
740 if (xprt->snd_task != cookie) in xprt_unlock_connect()
742 if (!test_bit(XPRT_LOCKED, &xprt->state)) in xprt_unlock_connect()
744 xprt->snd_task =NULL; in xprt_unlock_connect()
745 xprt->ops->release_xprt(xprt, NULL); in xprt_unlock_connect()
748 spin_unlock_bh(&xprt->transport_lock); in xprt_unlock_connect()
749 wake_up_bit(&xprt->state, XPRT_LOCKED); in xprt_unlock_connect()
753 * xprt_connect - schedule a transport connect operation
754 * @task: RPC task that is requesting the connect
759 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; in xprt_connect()
761 dprintk("RPC: %5u xprt_connect xprt %p %s connected\n", task->tk_pid, in xprt_connect()
764 if (!xprt_bound(xprt)) { in xprt_connect()
765 task->tk_status = -EAGAIN; in xprt_connect()
768 if (!xprt_lock_write(xprt, task)) in xprt_connect()
771 if (!xprt_connected(xprt) && !test_bit(XPRT_CLOSE_WAIT, &xprt->state)) { in xprt_connect()
772 task->tk_rqstp->rq_bytes_sent = 0; in xprt_connect()
773 task->tk_timeout = task->tk_rqstp->rq_timeout; in xprt_connect()
774 task->tk_rqstp->rq_connect_cookie = xprt->connect_cookie; in xprt_connect()
775 rpc_sleep_on(&xprt->pending, task, xprt_connect_status); in xprt_connect()
777 if (test_bit(XPRT_CLOSING, &xprt->state)) in xprt_connect()
779 if (xprt_test_and_set_connecting(xprt)) in xprt_connect()
782 if (!xprt_connected(xprt)) { in xprt_connect()
783 xprt->stat.connect_start = jiffies; in xprt_connect()
784 xprt->ops->connect(xprt, task); in xprt_connect()
787 task->tk_status = 0; in xprt_connect()
788 rpc_wake_up_queued_task(&xprt->pending, task); in xprt_connect()
796 switch (task->tk_status) { in xprt_connect_status()
798 dprintk("RPC: %5u xprt_connect_status: connection established\n", in xprt_connect_status()
799 task->tk_pid); in xprt_connect_status()
801 case -ECONNREFUSED: in xprt_connect_status()
802 case -ECONNRESET: in xprt_connect_status()
803 case -ECONNABORTED: in xprt_connect_status()
804 case -ENETUNREACH: in xprt_connect_status()
805 case -EHOSTUNREACH: in xprt_connect_status()
806 case -EPIPE: in xprt_connect_status()
807 case -EAGAIN: in xprt_connect_status()
808 dprintk("RPC: %5u xprt_connect_status: retrying\n", task->tk_pid); in xprt_connect_status()
810 case -ETIMEDOUT: in xprt_connect_status()
811 dprintk("RPC: %5u xprt_connect_status: connect attempt timed " in xprt_connect_status()
812 "out\n", task->tk_pid); in xprt_connect_status()
815 dprintk("RPC: %5u xprt_connect_status: error %d connecting to " in xprt_connect_status()
816 "server %s\n", task->tk_pid, -task->tk_status, in xprt_connect_status()
817 task->tk_rqstp->rq_xprt->servername); in xprt_connect_status()
818 task->tk_status = -EIO; in xprt_connect_status()
823 * xprt_lookup_rqst - find an RPC request corresponding to an XID
825 * @xid: RPC XID of incoming reply
827 * Caller holds xprt->recv_lock.
833 list_for_each_entry(entry, &xprt->recv, rq_list) in xprt_lookup_rqst()
834 if (entry->rq_xid == xid) { in xprt_lookup_rqst()
836 entry->rq_rtt = ktime_sub(ktime_get(), entry->rq_xtime); in xprt_lookup_rqst()
840 dprintk("RPC: xprt_lookup_rqst did not find xid %08x\n", in xprt_lookup_rqst()
842 trace_xprt_lookup_rqst(xprt, xid, -ENOENT); in xprt_lookup_rqst()
843 xprt->stat.bad_xids++; in xprt_lookup_rqst()
849 * xprt_pin_rqst - Pin a request on the transport receive list
857 set_bit(RPC_TASK_MSG_RECV, &req->rq_task->tk_runstate); in xprt_pin_rqst()
862 * xprt_unpin_rqst - Unpin a request on the transport receive list
869 struct rpc_task *task = req->rq_task; in xprt_unpin_rqst()
871 clear_bit(RPC_TASK_MSG_RECV, &task->tk_runstate); in xprt_unpin_rqst()
872 if (test_bit(RPC_TASK_MSG_RECV_WAIT, &task->tk_runstate)) in xprt_unpin_rqst()
873 wake_up_bit(&task->tk_runstate, RPC_TASK_MSG_RECV); in xprt_unpin_rqst()
878 __must_hold(&req->rq_xprt->recv_lock) in xprt_wait_on_pinned_rqst()
880 struct rpc_task *task = req->rq_task; in xprt_wait_on_pinned_rqst()
882 if (task && test_bit(RPC_TASK_MSG_RECV, &task->tk_runstate)) { in xprt_wait_on_pinned_rqst()
883 spin_unlock(&req->rq_xprt->recv_lock); in xprt_wait_on_pinned_rqst()
884 set_bit(RPC_TASK_MSG_RECV_WAIT, &task->tk_runstate); in xprt_wait_on_pinned_rqst()
885 wait_on_bit(&task->tk_runstate, RPC_TASK_MSG_RECV, in xprt_wait_on_pinned_rqst()
887 clear_bit(RPC_TASK_MSG_RECV_WAIT, &task->tk_runstate); in xprt_wait_on_pinned_rqst()
888 spin_lock(&req->rq_xprt->recv_lock); in xprt_wait_on_pinned_rqst()
893 * xprt_update_rtt - Update RPC RTT statistics
894 * @task: RPC request that recently completed
896 * Caller holds xprt->recv_lock.
900 struct rpc_rqst *req = task->tk_rqstp; in xprt_update_rtt()
901 struct rpc_rtt *rtt = task->tk_client->cl_rtt; in xprt_update_rtt()
902 unsigned int timer = task->tk_msg.rpc_proc->p_timer; in xprt_update_rtt()
903 long m = usecs_to_jiffies(ktime_to_us(req->rq_rtt)); in xprt_update_rtt()
905 if (timer) { in xprt_update_rtt()
906 if (req->rq_ntrans == 1) in xprt_update_rtt()
908 rpc_set_timeo(rtt, timer, req->rq_ntrans - 1); in xprt_update_rtt()
914 * xprt_complete_rqst - called when reply processing is complete
915 * @task: RPC request that recently completed
918 * Caller holds xprt->recv_lock.
922 struct rpc_rqst *req = task->tk_rqstp; in xprt_complete_rqst()
923 struct rpc_xprt *xprt = req->rq_xprt; in xprt_complete_rqst()
925 dprintk("RPC: %5u xid %08x complete (%d bytes received)\n", in xprt_complete_rqst()
926 task->tk_pid, ntohl(req->rq_xid), copied); in xprt_complete_rqst()
927 trace_xprt_complete_rqst(xprt, req->rq_xid, copied); in xprt_complete_rqst()
929 xprt->stat.recvs++; in xprt_complete_rqst()
931 list_del_init(&req->rq_list); in xprt_complete_rqst()
932 req->rq_private_buf.len = copied; in xprt_complete_rqst()
934 /* req->rq_reply_bytes_recvd */ in xprt_complete_rqst()
936 req->rq_reply_bytes_recvd = copied; in xprt_complete_rqst()
937 rpc_wake_up_queued_task(&xprt->pending, task); in xprt_complete_rqst()
943 struct rpc_rqst *req = task->tk_rqstp; in xprt_timer()
944 struct rpc_xprt *xprt = req->rq_xprt; in xprt_timer()
946 if (task->tk_status != -ETIMEDOUT) in xprt_timer()
949 trace_xprt_timer(xprt, req->rq_xid, task->tk_status); in xprt_timer()
950 if (!req->rq_reply_bytes_recvd) { in xprt_timer()
951 if (xprt->ops->timer) in xprt_timer()
952 xprt->ops->timer(xprt, task); in xprt_timer()
954 task->tk_status = 0; in xprt_timer()
958 * xprt_prepare_transmit - reserve the transport before sending a request
959 * @task: RPC task about to send a request
964 struct rpc_rqst *req = task->tk_rqstp; in xprt_prepare_transmit()
965 struct rpc_xprt *xprt = req->rq_xprt; in xprt_prepare_transmit()
968 dprintk("RPC: %5u xprt_prepare_transmit\n", task->tk_pid); in xprt_prepare_transmit()
970 spin_lock_bh(&xprt->transport_lock); in xprt_prepare_transmit()
971 if (!req->rq_bytes_sent) { in xprt_prepare_transmit()
972 if (req->rq_reply_bytes_recvd) { in xprt_prepare_transmit()
973 task->tk_status = req->rq_reply_bytes_recvd; in xprt_prepare_transmit()
976 if ((task->tk_flags & RPC_TASK_NO_RETRANS_TIMEOUT) in xprt_prepare_transmit()
978 && req->rq_connect_cookie == xprt->connect_cookie) { in xprt_prepare_transmit()
979 xprt->ops->set_retrans_timeout(task); in xprt_prepare_transmit()
980 rpc_sleep_on(&xprt->pending, task, xprt_timer); in xprt_prepare_transmit()
984 if (!xprt->ops->reserve_xprt(xprt, task)) { in xprt_prepare_transmit()
985 task->tk_status = -EAGAIN; in xprt_prepare_transmit()
990 spin_unlock_bh(&xprt->transport_lock); in xprt_prepare_transmit()
996 xprt_release_write(task->tk_rqstp->rq_xprt, task); in xprt_end_transmit()
1000 * xprt_transmit - send an RPC request on a transport
1001 * @task: controlling RPC task
1007 struct rpc_rqst *req = task->tk_rqstp; in xprt_transmit()
1008 struct rpc_xprt *xprt = req->rq_xprt; in xprt_transmit()
1012 dprintk("RPC: %5u xprt_transmit(%u)\n", task->tk_pid, req->rq_slen); in xprt_transmit()
1014 if (!req->rq_reply_bytes_recvd) { in xprt_transmit()
1015 if (list_empty(&req->rq_list) && rpc_reply_expected(task)) { in xprt_transmit()
1017 * Add to the list only if we're expecting a reply in xprt_transmit()
1020 memcpy(&req->rq_private_buf, &req->rq_rcv_buf, in xprt_transmit()
1021 sizeof(req->rq_private_buf)); in xprt_transmit()
1023 spin_lock(&xprt->recv_lock); in xprt_transmit()
1024 list_add_tail(&req->rq_list, &xprt->recv); in xprt_transmit()
1025 spin_unlock(&xprt->recv_lock); in xprt_transmit()
1028 del_singleshot_timer_sync(&xprt->timer); in xprt_transmit()
1030 } else if (!req->rq_bytes_sent) in xprt_transmit()
1033 connect_cookie = xprt->connect_cookie; in xprt_transmit()
1034 status = xprt->ops->send_request(task); in xprt_transmit()
1035 trace_xprt_transmit(xprt, req->rq_xid, status); in xprt_transmit()
1036 if (status != 0) { in xprt_transmit()
1037 task->tk_status = status; in xprt_transmit()
1042 dprintk("RPC: %5u xmit complete\n", task->tk_pid); in xprt_transmit()
1043 task->tk_flags |= RPC_TASK_SENT; in xprt_transmit()
1044 spin_lock_bh(&xprt->transport_lock); in xprt_transmit()
1046 xprt->ops->set_retrans_timeout(task); in xprt_transmit()
1048 xprt->stat.sends++; in xprt_transmit()
1049 xprt->stat.req_u += xprt->stat.sends - xprt->stat.recvs; in xprt_transmit()
1050 xprt->stat.bklog_u += xprt->backlog.qlen; in xprt_transmit()
1051 xprt->stat.sending_u += xprt->sending.qlen; in xprt_transmit()
1052 xprt->stat.pending_u += xprt->pending.qlen; in xprt_transmit()
1053 spin_unlock_bh(&xprt->transport_lock); in xprt_transmit()
1055 req->rq_connect_cookie = connect_cookie; in xprt_transmit()
1056 if (rpc_reply_expected(task) && !READ_ONCE(req->rq_reply_bytes_recvd)) { in xprt_transmit()
1058 * Sleep on the pending queue if we're expecting a reply. in xprt_transmit()
1060 * req->rq_reply_bytes_recvd, and the call to rpc_sleep_on(). in xprt_transmit()
1062 spin_lock(&xprt->recv_lock); in xprt_transmit()
1063 if (!req->rq_reply_bytes_recvd) { in xprt_transmit()
1064 rpc_sleep_on(&xprt->pending, task, xprt_timer); in xprt_transmit()
1066 * Send an extra queue wakeup call if the in xprt_transmit()
1070 if (!xprt_connected(xprt)) in xprt_transmit()
1071 xprt_wake_pending_tasks(xprt, -ENOTCONN); in xprt_transmit()
1073 spin_unlock(&xprt->recv_lock); in xprt_transmit()
1079 set_bit(XPRT_CONGESTED, &xprt->state); in xprt_add_backlog()
1080 rpc_sleep_on(&xprt->backlog, task, NULL); in xprt_add_backlog()
1085 if (rpc_wake_up_next(&xprt->backlog) == NULL) in xprt_wake_up_backlog()
1086 clear_bit(XPRT_CONGESTED, &xprt->state); in xprt_wake_up_backlog()
1093 if (!test_bit(XPRT_CONGESTED, &xprt->state)) in xprt_throttle_congested()
1095 spin_lock(&xprt->reserve_lock); in xprt_throttle_congested()
1096 if (test_bit(XPRT_CONGESTED, &xprt->state)) { in xprt_throttle_congested()
1097 rpc_sleep_on(&xprt->backlog, task, NULL); in xprt_throttle_congested()
1100 spin_unlock(&xprt->reserve_lock); in xprt_throttle_congested()
1107 struct rpc_rqst *req = ERR_PTR(-EAGAIN); in xprt_dynamic_alloc_slot()
1109 if (xprt->num_reqs >= xprt->max_reqs) in xprt_dynamic_alloc_slot()
1111 ++xprt->num_reqs; in xprt_dynamic_alloc_slot()
1112 spin_unlock(&xprt->reserve_lock); in xprt_dynamic_alloc_slot()
1114 spin_lock(&xprt->reserve_lock); in xprt_dynamic_alloc_slot()
1115 if (req != NULL) in xprt_dynamic_alloc_slot()
1117 --xprt->num_reqs; in xprt_dynamic_alloc_slot()
1118 req = ERR_PTR(-ENOMEM); in xprt_dynamic_alloc_slot()
1125 if (xprt->num_reqs > xprt->min_reqs) { in xprt_dynamic_free_slot()
1126 --xprt->num_reqs; in xprt_dynamic_free_slot()
1137 spin_lock(&xprt->reserve_lock); in xprt_alloc_slot()
1138 if (!list_empty(&xprt->free)) { in xprt_alloc_slot()
1139 req = list_entry(xprt->free.next, struct rpc_rqst, rq_list); in xprt_alloc_slot()
1140 list_del(&req->rq_list); in xprt_alloc_slot()
1144 if (!IS_ERR(req)) in xprt_alloc_slot()
1147 case -ENOMEM: in xprt_alloc_slot()
1148 dprintk("RPC: dynamic allocation of request slot " in xprt_alloc_slot()
1150 task->tk_status = -ENOMEM; in xprt_alloc_slot()
1152 case -EAGAIN: in xprt_alloc_slot()
1154 dprintk("RPC: waiting for request slot\n"); in xprt_alloc_slot()
1157 task->tk_status = -EAGAIN; in xprt_alloc_slot()
1159 spin_unlock(&xprt->reserve_lock); in xprt_alloc_slot()
1162 xprt->stat.max_slots = max_t(unsigned int, xprt->stat.max_slots, in xprt_alloc_slot()
1163 xprt->num_reqs); in xprt_alloc_slot()
1164 spin_unlock(&xprt->reserve_lock); in xprt_alloc_slot()
1166 task->tk_status = 0; in xprt_alloc_slot()
1167 task->tk_rqstp = req; in xprt_alloc_slot()
1174 * new slot allocation if the transport is congested (i.e. when in xprt_lock_and_alloc_slot()
1178 if (xprt_lock_write(xprt, task)) { in xprt_lock_and_alloc_slot()
1187 spin_lock(&xprt->reserve_lock); in xprt_free_slot()
1188 if (!xprt_dynamic_free_slot(xprt, req)) { in xprt_free_slot()
1190 list_add(&req->rq_list, &xprt->free); in xprt_free_slot()
1193 spin_unlock(&xprt->reserve_lock); in xprt_free_slot()
1200 while (!list_empty(&xprt->free)) { in xprt_free_all_slots()
1201 req = list_first_entry(&xprt->free, struct rpc_rqst, rq_list); in xprt_free_all_slots()
1202 list_del(&req->rq_list); in xprt_free_all_slots()
1216 if (xprt == NULL) in xprt_alloc()
1223 if (!req) in xprt_alloc()
1225 list_add(&req->rq_list, &xprt->free); in xprt_alloc()
1227 if (max_alloc > num_prealloc) in xprt_alloc()
1228 xprt->max_reqs = max_alloc; in xprt_alloc()
1230 xprt->max_reqs = num_prealloc; in xprt_alloc()
1231 xprt->min_reqs = num_prealloc; in xprt_alloc()
1232 xprt->num_reqs = num_prealloc; in xprt_alloc()
1245 put_net(xprt->xprt_net); in xprt_free()
1256 spin_lock(&xprt->reserve_lock); in xprt_alloc_xid()
1257 xid = (__force __be32)xprt->xid++; in xprt_alloc_xid()
1258 spin_unlock(&xprt->reserve_lock); in xprt_alloc_xid()
1265 xprt->xid = prandom_u32(); in xprt_init_xid()
1271 struct rpc_xprt *xprt = task->tk_xprt; in xprt_request_init()
1272 struct rpc_rqst *req = task->tk_rqstp; in xprt_request_init()
1274 INIT_LIST_HEAD(&req->rq_list); in xprt_request_init()
1275 req->rq_timeout = task->tk_client->cl_timeout->to_initval; in xprt_request_init()
1276 req->rq_task = task; in xprt_request_init()
1277 req->rq_xprt = xprt; in xprt_request_init()
1278 req->rq_buffer = NULL; in xprt_request_init()
1279 req->rq_xid = xprt_alloc_xid(xprt); in xprt_request_init()
1280 req->rq_connect_cookie = xprt->connect_cookie - 1; in xprt_request_init()
1281 req->rq_bytes_sent = 0; in xprt_request_init()
1282 req->rq_snd_buf.len = 0; in xprt_request_init()
1283 req->rq_snd_buf.buflen = 0; in xprt_request_init()
1284 req->rq_rcv_buf.len = 0; in xprt_request_init()
1285 req->rq_rcv_buf.buflen = 0; in xprt_request_init()
1286 req->rq_release_snd_buf = NULL; in xprt_request_init()
1288 dprintk("RPC: %5u reserved req %p xid %08x\n", task->tk_pid, in xprt_request_init()
1289 req, ntohl(req->rq_xid)); in xprt_request_init()
1295 xprt->ops->alloc_slot(xprt, task); in xprt_do_reserve()
1296 if (task->tk_rqstp != NULL) in xprt_do_reserve()
1301 * xprt_reserve - allocate an RPC request slot
1302 * @task: RPC task requesting a slot allocation
1304 * If the transport is marked as being congested, or if no more
1310 struct rpc_xprt *xprt = task->tk_xprt; in xprt_reserve()
1312 task->tk_status = 0; in xprt_reserve()
1313 if (task->tk_rqstp != NULL) in xprt_reserve()
1316 task->tk_timeout = 0; in xprt_reserve()
1317 task->tk_status = -EAGAIN; in xprt_reserve()
1318 if (!xprt_throttle_congested(xprt, task)) in xprt_reserve()
1323 * xprt_retry_reserve - allocate an RPC request slot
1324 * @task: RPC task requesting a slot allocation
1326 * If no more slots are available, place the task on the transport's
1333 struct rpc_xprt *xprt = task->tk_xprt; in xprt_retry_reserve()
1335 task->tk_status = 0; in xprt_retry_reserve()
1336 if (task->tk_rqstp != NULL) in xprt_retry_reserve()
1339 task->tk_timeout = 0; in xprt_retry_reserve()
1340 task->tk_status = -EAGAIN; in xprt_retry_reserve()
1345 * xprt_release - release an RPC request slot
1352 struct rpc_rqst *req = task->tk_rqstp; in xprt_release()
1354 if (req == NULL) { in xprt_release()
1355 if (task->tk_client) { in xprt_release()
1356 xprt = task->tk_xprt; in xprt_release()
1357 if (xprt->snd_task == task) in xprt_release()
1363 xprt = req->rq_xprt; in xprt_release()
1364 if (task->tk_ops->rpc_count_stats != NULL) in xprt_release()
1365 task->tk_ops->rpc_count_stats(task, task->tk_calldata); in xprt_release()
1366 else if (task->tk_client) in xprt_release()
1367 rpc_count_iostats(task, task->tk_client->cl_metrics); in xprt_release()
1368 spin_lock(&xprt->recv_lock); in xprt_release()
1369 if (!list_empty(&req->rq_list)) { in xprt_release()
1370 list_del_init(&req->rq_list); in xprt_release()
1373 spin_unlock(&xprt->recv_lock); in xprt_release()
1374 spin_lock_bh(&xprt->transport_lock); in xprt_release()
1375 xprt->ops->release_xprt(xprt, task); in xprt_release()
1376 if (xprt->ops->release_request) in xprt_release()
1377 xprt->ops->release_request(task); in xprt_release()
1378 xprt->last_used = jiffies; in xprt_release()
1380 spin_unlock_bh(&xprt->transport_lock); in xprt_release()
1381 if (req->rq_buffer) in xprt_release()
1382 xprt->ops->buf_free(task); in xprt_release()
1384 if (req->rq_cred != NULL) in xprt_release()
1385 put_rpccred(req->rq_cred); in xprt_release()
1386 task->tk_rqstp = NULL; in xprt_release()
1387 if (req->rq_release_snd_buf) in xprt_release()
1388 req->rq_release_snd_buf(req); in xprt_release()
1390 dprintk("RPC: %5u release request %p\n", task->tk_pid, req); in xprt_release()
1391 if (likely(!bc_prealloc(req))) in xprt_release()
1392 xprt->ops->free_slot(xprt, req); in xprt_release()
1399 kref_init(&xprt->kref); in xprt_init()
1401 spin_lock_init(&xprt->transport_lock); in xprt_init()
1402 spin_lock_init(&xprt->reserve_lock); in xprt_init()
1403 spin_lock_init(&xprt->recv_lock); in xprt_init()
1405 INIT_LIST_HEAD(&xprt->free); in xprt_init()
1406 INIT_LIST_HEAD(&xprt->recv); in xprt_init()
1407 #if defined(CONFIG_SUNRPC_BACKCHANNEL) in xprt_init()
1408 spin_lock_init(&xprt->bc_pa_lock); in xprt_init()
1409 INIT_LIST_HEAD(&xprt->bc_pa_list); in xprt_init()
1411 INIT_LIST_HEAD(&xprt->xprt_switch); in xprt_init()
1413 xprt->last_used = jiffies; in xprt_init()
1414 xprt->cwnd = RPC_INITCWND; in xprt_init()
1415 xprt->bind_index = 0; in xprt_init()
1417 rpc_init_wait_queue(&xprt->binding, "xprt_binding"); in xprt_init()
1418 rpc_init_wait_queue(&xprt->pending, "xprt_pending"); in xprt_init()
1419 rpc_init_priority_wait_queue(&xprt->sending, "xprt_sending"); in xprt_init()
1420 rpc_init_priority_wait_queue(&xprt->backlog, "xprt_backlog"); in xprt_init()
1424 xprt->xprt_net = get_net(net); in xprt_init()
1428 * xprt_create_transport - create an RPC transport
1429 * @args: rpc transport creation arguments
1439 if (t->ident == args->ident) { in xprt_create_transport()
1445 dprintk("RPC: transport (%d) not supported\n", args->ident); in xprt_create_transport()
1446 return ERR_PTR(-EIO); in xprt_create_transport()
1449 xprt = t->setup(args); in xprt_create_transport()
1450 if (IS_ERR(xprt)) { in xprt_create_transport()
1451 dprintk("RPC: xprt_create_transport: failed, %ld\n", in xprt_create_transport()
1452 -PTR_ERR(xprt)); in xprt_create_transport()
1455 if (args->flags & XPRT_CREATE_NO_IDLE_TIMEOUT) in xprt_create_transport()
1456 xprt->idle_timeout = 0; in xprt_create_transport()
1457 INIT_WORK(&xprt->task_cleanup, xprt_autoclose); in xprt_create_transport()
1458 if (xprt_has_timer(xprt)) in xprt_create_transport()
1459 timer_setup(&xprt->timer, xprt_init_autodisconnect, 0); in xprt_create_transport()
1461 timer_setup(&xprt->timer, NULL, 0); in xprt_create_transport()
1463 if (strlen(args->servername) > RPC_MAXNETNAMELEN) { in xprt_create_transport()
1465 return ERR_PTR(-EINVAL); in xprt_create_transport()
1467 xprt->servername = kstrdup(args->servername, GFP_KERNEL); in xprt_create_transport()
1468 if (xprt->servername == NULL) { in xprt_create_transport()
1470 return ERR_PTR(-ENOMEM); in xprt_create_transport()
1475 dprintk("RPC: created transport %p with %u slots\n", xprt, in xprt_create_transport()
1476 xprt->max_reqs); in xprt_create_transport()
1487 rpc_destroy_wait_queue(&xprt->binding); in xprt_destroy_cb()
1488 rpc_destroy_wait_queue(&xprt->pending); in xprt_destroy_cb()
1489 rpc_destroy_wait_queue(&xprt->sending); in xprt_destroy_cb()
1490 rpc_destroy_wait_queue(&xprt->backlog); in xprt_destroy_cb()
1491 kfree(xprt->servername); in xprt_destroy_cb()
1495 xprt->ops->destroy(xprt); in xprt_destroy_cb()
1499 * xprt_destroy - destroy an RPC transport, killing off all requests.
1505 dprintk("RPC: destroying transport %p\n", xprt); in xprt_destroy()
1510 wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_UNINTERRUPTIBLE); in xprt_destroy()
1512 del_timer_sync(&xprt->timer); in xprt_destroy()
1518 INIT_WORK(&xprt->task_cleanup, xprt_destroy_cb); in xprt_destroy()
1519 schedule_work(&xprt->task_cleanup); in xprt_destroy()
1528 * xprt_get - return a reference to an RPC transport.
1534 if (xprt != NULL && kref_get_unless_zero(&xprt->kref)) in xprt_get()
1541 * xprt_put - release a reference to an RPC transport.
1547 if (xprt != NULL) in xprt_put()
1548 kref_put(&xprt->kref, xprt_destroy_kref); in xprt_put()