8  * call so as to handle retransmitted DATA packets in case the server didn't
15  *      or a call ID counter overflows.
340  * Create or find a client bundle to use for a call.
342  * If we return with a connection, the call will be on its waiting list.  It's
343  * left to the caller to assign a channel and wake up the call.
346 					    struct rxrpc_call *call,  in rxrpc_prep_call()  argument
353 	_enter("{%d,%lx},", call->debug_id, call->user_call_ID);  in rxrpc_prep_call()
359 	call->cong_cwnd = cp->peer->cong_cwnd;  in rxrpc_prep_call()
360 	if (call->cong_cwnd >= call->cong_ssthresh)  in rxrpc_prep_call()
361 		call->cong_mode = RXRPC_CALL_CONGEST_AVOIDANCE;  in rxrpc_prep_call()
363 		call->cong_mode = RXRPC_CALL_SLOW_START;  in rxrpc_prep_call()
365 		__set_bit(RXRPC_CALL_UPGRADE, &call->flags);  in rxrpc_prep_call()
372 	/* Get this call queued.  Someone else may activate it whilst we're  in rxrpc_prep_call()
376 	list_add_tail(&call->chan_wait_link, &bundle->waiting_calls);  in rxrpc_prep_call()
459 	struct rxrpc_call *call;  in rxrpc_maybe_add_conn()  local
473 		call = list_first_entry(&bundle->waiting_calls,  in rxrpc_maybe_add_conn()
475 		if (test_bit(RXRPC_CALL_UPGRADE, &call->flags))  in rxrpc_maybe_add_conn()
497  * Assign a channel to the call at the front of the queue and wake the call up.
506 	struct rxrpc_call *call = list_entry(bundle->waiting_calls.next,  in rxrpc_activate_one_channel()  local
514 	/* Cancel the final ACK on the previous call if it hasn't been sent yet  in rxrpc_activate_one_channel()
520 	rxrpc_see_call(call);  in rxrpc_activate_one_channel()
521 	list_del_init(&call->chan_wait_link);  in rxrpc_activate_one_channel()
522 	call->peer	= rxrpc_get_peer(conn->params.peer);  in rxrpc_activate_one_channel()
523 	call->conn	= rxrpc_get_connection(conn);  in rxrpc_activate_one_channel()
524 	call->cid	= conn->proto.cid | channel;  in rxrpc_activate_one_channel()
525 	call->call_id	= call_id;  in rxrpc_activate_one_channel()
526 	call->security	= conn->security;  in rxrpc_activate_one_channel()
527 	call->security_ix = conn->security_ix;  in rxrpc_activate_one_channel()
528 	call->service_id = conn->service_id;  in rxrpc_activate_one_channel()
530 	trace_rxrpc_connect_call(call);  in rxrpc_activate_one_channel()
531 	_net("CONNECT call %08x:%08x as call %d on conn %d",  in rxrpc_activate_one_channel()
532 	     call->cid, call->call_id, call->debug_id, conn->debug_id);  in rxrpc_activate_one_channel()
534 	write_lock_bh(&call->state_lock);  in rxrpc_activate_one_channel()
535 	call->state = RXRPC_CALL_CLIENT_SEND_REQUEST;  in rxrpc_activate_one_channel()
536 	write_unlock_bh(&call->state_lock);  in rxrpc_activate_one_channel()
543 	 * confirm it until the call is about to be exposed.  in rxrpc_activate_one_channel()
546 	 * at the call ID through a connection channel.  in rxrpc_activate_one_channel()
551 	chan->call_debug_id	= call->debug_id;  in rxrpc_activate_one_channel()
552 	rcu_assign_pointer(chan->call, call);  in rxrpc_activate_one_channel()
553 	wake_up(&call->waitq);  in rxrpc_activate_one_channel()
633  * Wait for a callNumber and a channel to be granted to a call.
636 				  struct rxrpc_call *call, gfp_t gfp)  in rxrpc_wait_for_channel()  argument
641 	_enter("%d", call->debug_id);  in rxrpc_wait_for_channel()
650 	add_wait_queue_exclusive(&call->waitq, &myself);  in rxrpc_wait_for_channel()
658 		switch (call->interruptibility) {  in rxrpc_wait_for_channel()
668 		if (READ_ONCE(call->state) != RXRPC_CALL_CLIENT_AWAIT_CONN)  in rxrpc_wait_for_channel()
670 		if ((call->interruptibility == RXRPC_INTERRUPTIBLE ||  in rxrpc_wait_for_channel()
671 		     call->interruptibility == RXRPC_PREINTERRUPTIBLE) &&  in rxrpc_wait_for_channel()
678 	remove_wait_queue(&call->waitq, &myself);  in rxrpc_wait_for_channel()
687  * find a connection for a call
691 		       struct rxrpc_call *call,  in rxrpc_connect_call()  argument
700 	_enter("{%d,%lx},", call->debug_id, call->user_call_ID);  in rxrpc_connect_call()
704 	bundle = rxrpc_prep_call(rx, call, cp, srx, gfp);  in rxrpc_connect_call()
710 	if (call->state == RXRPC_CALL_CLIENT_AWAIT_CONN) {  in rxrpc_connect_call()
711 		ret = rxrpc_wait_for_channel(bundle, call, gfp);  in rxrpc_connect_call()
728 	list_del_init(&call->chan_wait_link);  in rxrpc_connect_call()
731 	if (call->state != RXRPC_CALL_CLIENT_AWAIT_CONN) {  in rxrpc_connect_call()
736 	trace_rxrpc_client(call->conn, ret, rxrpc_client_chan_wait_failed);  in rxrpc_connect_call()
737 	rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 0, ret);  in rxrpc_connect_call()
738 	rxrpc_disconnect_client_call(bundle, call);  in rxrpc_connect_call()
743  * Note that a call, and thus a connection, is about to be exposed to the
746 void rxrpc_expose_client_call(struct rxrpc_call *call)  in rxrpc_expose_client_call()  argument
748 	unsigned int channel = call->cid & RXRPC_CHANNELMASK;  in rxrpc_expose_client_call()
749 	struct rxrpc_connection *conn = call->conn;  in rxrpc_expose_client_call()
752 	if (!test_and_set_bit(RXRPC_CALL_EXPOSED, &call->flags)) {  in rxrpc_expose_client_call()
753 		/* Mark the call ID as being used.  If the callNumber counter  in rxrpc_expose_client_call()
780  * Disconnect a client call.
782 void rxrpc_disconnect_client_call(struct rxrpc_bundle *bundle, struct rxrpc_call *call)  in rxrpc_disconnect_client_call()  argument
791 	_enter("c=%x", call->debug_id);  in rxrpc_disconnect_client_call()
794 	set_bit(RXRPC_CALL_DISCONNECTED, &call->flags);  in rxrpc_disconnect_client_call()
799 	conn = call->conn;  in rxrpc_disconnect_client_call()
801 		_debug("call is waiting");  in rxrpc_disconnect_client_call()
802 		ASSERTCMP(call->call_id, ==, 0);  in rxrpc_disconnect_client_call()
803 		ASSERT(!test_bit(RXRPC_CALL_EXPOSED, &call->flags));  in rxrpc_disconnect_client_call()
804 		list_del_init(&call->chan_wait_link);  in rxrpc_disconnect_client_call()
808 	cid = call->cid;  in rxrpc_disconnect_client_call()
813 	if (rcu_access_pointer(chan->call) != call) {  in rxrpc_disconnect_client_call()
820 	/* If a client call was exposed to the world, we save the result for  in rxrpc_disconnect_client_call()
823 	 * We use a barrier here so that the call number and abort code can be  in rxrpc_disconnect_client_call()
827 	 * terminal retransmission without requiring access to the call.  in rxrpc_disconnect_client_call()
829 	if (test_bit(RXRPC_CALL_EXPOSED, &call->flags)) {  in rxrpc_disconnect_client_call()
830 		_debug("exposed %u,%u", call->call_id, call->abort_code);  in rxrpc_disconnect_client_call()
831 		__rxrpc_disconnect_call(conn, call);  in rxrpc_disconnect_client_call()
842 	/* See if we can pass the channel directly to another call. */  in rxrpc_disconnect_client_call()
850 	 * can be skipped if we find a follow-on call.  The first DATA packet  in rxrpc_disconnect_client_call()
851 	 * of the follow on call will implicitly ACK this call.  in rxrpc_disconnect_client_call()
853 	if (call->completion == RXRPC_CALL_SUCCEEDED &&  in rxrpc_disconnect_client_call()
854 	    test_bit(RXRPC_CALL_EXPOSED, &call->flags)) {  in rxrpc_disconnect_client_call()
864 	rcu_assign_pointer(chan->call, NULL);  in rxrpc_disconnect_client_call()