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97ede29e80
Convert tipc name table read-write lock to RCU. After this change, a new spin lock is used to protect name table on write side while RCU is applied on read side. Signed-off-by: Ying Xue <ying.xue@windriver.com> Reviewed-by: Erik Hugne <erik.hugne@ericsson.com> Reviewed-by: Jon Maloy <jon.maloy@ericsson.com> Tested-by: Erik Hugne <erik.hugne@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
121 lines
4.7 KiB
C
121 lines
4.7 KiB
C
/*
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* net/tipc/name_table.h: Include file for TIPC name table code
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*
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* Copyright (c) 2000-2006, 2014, Ericsson AB
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* Copyright (c) 2004-2005, 2010-2011, 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_NAME_TABLE_H
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#define _TIPC_NAME_TABLE_H
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struct tipc_subscription;
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struct tipc_port_list;
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/*
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* TIPC name types reserved for internal TIPC use (both current and planned)
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*/
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#define TIPC_ZM_SRV 3 /* zone master service name type */
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#define TIPC_PUBL_SCOPE_NUM (TIPC_NODE_SCOPE + 1)
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#define TIPC_NAMETBL_SIZE 1024 /* must be a power of 2 */
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/**
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* struct publication - info about a published (name or) name sequence
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* @type: name sequence type
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* @lower: name sequence lower bound
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* @upper: name sequence upper bound
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* @scope: scope of publication
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* @node: network address of publishing port's node
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* @ref: publishing port
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* @key: publication key
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* @nodesub_list: subscription to "node down" event (off-node publication only)
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* @local_list: adjacent entries in list of publications made by this node
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* @pport_list: adjacent entries in list of publications made by this port
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* @node_list: adjacent matching name seq publications with >= node scope
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* @cluster_list: adjacent matching name seq publications with >= cluster scope
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* @zone_list: adjacent matching name seq publications with >= zone scope
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* @rcu: RCU callback head used for deferred freeing
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*
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* Note that the node list, cluster list, and zone list are circular lists.
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*/
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struct publication {
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u32 type;
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u32 lower;
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u32 upper;
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u32 scope;
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u32 node;
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u32 ref;
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u32 key;
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struct list_head nodesub_list;
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struct list_head local_list;
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struct list_head pport_list;
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struct list_head node_list;
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struct list_head cluster_list;
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struct list_head zone_list;
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struct rcu_head rcu;
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};
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/**
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* struct name_table - table containing all existing port name publications
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* @seq_hlist: name sequence hash lists
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* @publ_list: pulication lists
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* @local_publ_count: number of publications issued by this node
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*/
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struct name_table {
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struct hlist_head seq_hlist[TIPC_NAMETBL_SIZE];
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struct list_head publ_list[TIPC_PUBL_SCOPE_NUM];
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u32 local_publ_count;
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};
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extern spinlock_t tipc_nametbl_lock;
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extern struct name_table *tipc_nametbl;
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int tipc_nl_name_table_dump(struct sk_buff *skb, struct netlink_callback *cb);
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struct sk_buff *tipc_nametbl_get(const void *req_tlv_area, int req_tlv_space);
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u32 tipc_nametbl_translate(u32 type, u32 instance, u32 *node);
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int tipc_nametbl_mc_translate(u32 type, u32 lower, u32 upper, u32 limit,
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struct tipc_port_list *dports);
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struct publication *tipc_nametbl_publish(u32 type, u32 lower, u32 upper,
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u32 scope, u32 port_ref, u32 key);
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int tipc_nametbl_withdraw(u32 type, u32 lower, u32 ref, u32 key);
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struct publication *tipc_nametbl_insert_publ(u32 type, u32 lower, u32 upper,
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u32 scope, u32 node, u32 ref,
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u32 key);
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struct publication *tipc_nametbl_remove_publ(u32 type, u32 lower, u32 node,
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u32 ref, u32 key);
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void tipc_nametbl_subscribe(struct tipc_subscription *s);
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void tipc_nametbl_unsubscribe(struct tipc_subscription *s);
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int tipc_nametbl_init(void);
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void tipc_nametbl_stop(void);
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#endif
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