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This patch modifies TIPC's network topology service so that it only requires a single reference table entry per subscriber connection, rather than two. This is achieved by letting the reference to the server port communicating with the subscriber act as the reference to the subscriber object itself. (Since the subscriber cannot exist without its port, and vice versa, this dual role for the reference is perfectly natural.) This consolidation reduces the size of the reference table by 50% in the default configuration. Signed-off-by: Allan Stephens <allan.stephens@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
91 lines
3.3 KiB
C
91 lines
3.3 KiB
C
/*
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* net/tipc/subscr.h: Include file for TIPC subscription service
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*
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* Copyright (c) 2003-2006, Ericsson AB
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* Copyright (c) 2005, Wind River Systems
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _TIPC_SUBSCR_H
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#define _TIPC_SUBSCR_H
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struct subscription;
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typedef void (*tipc_subscr_event) (struct subscription *sub,
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u32 found_lower, u32 found_upper,
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u32 event, u32 port_ref, u32 node);
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/**
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* struct subscription - TIPC network topology subscription object
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* @seq: name sequence associated with subscription
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* @timeout: duration of subscription (in ms)
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* @filter: event filtering to be done for subscription
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* @event_cb: routine invoked when a subscription event is detected
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* @server_ref: object reference of server port associated with subscription
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* @swap: indicates if subscriber uses opposite endianness in its messages
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* @evt: template for events generated by subscription
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* @subscription_list: adjacent subscriptions in subscriber's subscription list
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* @nameseq_list: adjacent subscriptions in name sequence's subscription list
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* @timer_ref: reference to timer governing subscription duration (may be NULL)
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*/
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struct subscription {
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struct tipc_name_seq seq;
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u32 timeout;
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u32 filter;
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tipc_subscr_event event_cb;
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u32 server_ref;
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int swap;
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struct tipc_event evt;
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struct list_head subscription_list;
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struct list_head nameseq_list;
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struct timer_list timer;
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};
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int tipc_subscr_overlap(struct subscription * sub,
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u32 found_lower,
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u32 found_upper);
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void tipc_subscr_report_overlap(struct subscription * sub,
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u32 found_lower,
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u32 found_upper,
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u32 event,
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u32 port_ref,
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u32 node,
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int must_report);
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int tipc_subscr_start(void);
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void tipc_subscr_stop(void);
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#endif
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