![Jon Paul Maloy](/assets/img/avatar_default.png)
According to the node FSM a node in state SELF_UP_PEER_UP cannot change state inside a lock context, except when a TUNNEL_PROTOCOL (SYNCH or FAILOVER) packet arrives. However, the node's individual links may still change state. Since each link now is protected by its own spinlock, we finally have the conditions in place to convert the node spinlock to an rwlock_t. If the node state and arriving packet type are rigth, we can let the link directly receive the packet under protection of its own spinlock and the node lock in read mode. In all other cases we use the node lock in write mode. This enables full concurrent execution between parallel links during steady-state traffic situations, i.e., 99+ % of the time. This commit implements this change. Reviewed-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
189 lines
6.5 KiB
C
189 lines
6.5 KiB
C
/*
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* net/tipc/node.h: Include file for TIPC node management routines
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*
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* Copyright (c) 2000-2006, 2014-2015, Ericsson AB
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* Copyright (c) 2005, 2010-2014, 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_NODE_H
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#define _TIPC_NODE_H
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#include "addr.h"
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#include "net.h"
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#include "bearer.h"
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#include "msg.h"
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/* Out-of-range value for node signature */
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#define INVALID_NODE_SIG 0x10000
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#define INVALID_BEARER_ID -1
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/* Flags used to take different actions according to flag type
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* TIPC_NOTIFY_NODE_DOWN: notify node is down
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* TIPC_NOTIFY_NODE_UP: notify node is up
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* TIPC_DISTRIBUTE_NAME: publish or withdraw link state name type
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*/
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enum {
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TIPC_NOTIFY_NODE_DOWN = (1 << 3),
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TIPC_NOTIFY_NODE_UP = (1 << 4),
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TIPC_NOTIFY_LINK_UP = (1 << 6),
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TIPC_NOTIFY_LINK_DOWN = (1 << 7)
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};
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/* Optional capabilities supported by this code version
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*/
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enum {
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TIPC_BCAST_SYNCH = (1 << 1)
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};
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#define TIPC_NODE_CAPABILITIES TIPC_BCAST_SYNCH
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struct tipc_link_entry {
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struct tipc_link *link;
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spinlock_t lock; /* per-link */
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u32 mtu;
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struct sk_buff_head inputq;
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struct tipc_media_addr maddr;
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};
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struct tipc_bclink_entry {
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struct tipc_link *link;
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struct sk_buff_head inputq1;
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struct sk_buff_head arrvq;
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struct sk_buff_head inputq2;
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struct sk_buff_head namedq;
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};
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/**
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* struct tipc_node - TIPC node structure
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* @addr: network address of node
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* @ref: reference counter to node object
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* @lock: rwlock governing access to structure
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* @net: the applicable net namespace
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* @hash: links to adjacent nodes in unsorted hash chain
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* @inputq: pointer to input queue containing messages for msg event
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* @namedq: pointer to name table input queue with name table messages
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* @active_links: bearer ids of active links, used as index into links[] array
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* @links: array containing references to all links to node
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* @action_flags: bit mask of different types of node actions
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* @state: connectivity state vs peer node
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* @sync_point: sequence number where synch/failover is finished
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* @list: links to adjacent nodes in sorted list of cluster's nodes
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* @working_links: number of working links to node (both active and standby)
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* @link_cnt: number of links to node
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* @capabilities: bitmap, indicating peer node's functional capabilities
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* @signature: node instance identifier
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* @link_id: local and remote bearer ids of changing link, if any
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* @publ_list: list of publications
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* @rcu: rcu struct for tipc_node
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*/
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struct tipc_node {
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u32 addr;
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struct kref kref;
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rwlock_t lock;
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struct net *net;
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struct hlist_node hash;
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int active_links[2];
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struct tipc_link_entry links[MAX_BEARERS];
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struct tipc_bclink_entry bc_entry;
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int action_flags;
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struct list_head list;
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int state;
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u16 sync_point;
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int link_cnt;
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u16 working_links;
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u16 capabilities;
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u32 signature;
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u32 link_id;
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struct list_head publ_list;
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struct list_head conn_sks;
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unsigned long keepalive_intv;
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struct timer_list timer;
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struct rcu_head rcu;
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};
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struct tipc_node *tipc_node_find(struct net *net, u32 addr);
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void tipc_node_put(struct tipc_node *node);
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void tipc_node_stop(struct net *net);
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void tipc_node_check_dest(struct net *net, u32 onode,
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struct tipc_bearer *bearer,
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u16 capabilities, u32 signature,
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struct tipc_media_addr *maddr,
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bool *respond, bool *dupl_addr);
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void tipc_node_delete_links(struct net *net, int bearer_id);
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void tipc_node_attach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr);
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void tipc_node_detach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr);
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bool tipc_node_is_up(struct tipc_node *n);
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int tipc_node_get_linkname(struct net *net, u32 bearer_id, u32 node,
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char *linkname, size_t len);
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void tipc_node_read_lock(struct tipc_node *n);
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void tipc_node_read_unlock(struct tipc_node *node);
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int tipc_node_xmit(struct net *net, struct sk_buff_head *list, u32 dnode,
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int selector);
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int tipc_node_xmit_skb(struct net *net, struct sk_buff *skb, u32 dest,
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u32 selector);
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void tipc_node_subscribe(struct net *net, struct list_head *subscr, u32 addr);
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void tipc_node_unsubscribe(struct net *net, struct list_head *subscr, u32 addr);
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void tipc_node_broadcast(struct net *net, struct sk_buff *skb);
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int tipc_node_add_conn(struct net *net, u32 dnode, u32 port, u32 peer_port);
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void tipc_node_remove_conn(struct net *net, u32 dnode, u32 port);
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int tipc_nl_node_dump(struct sk_buff *skb, struct netlink_callback *cb);
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static inline struct tipc_link *node_active_link(struct tipc_node *n, int sel)
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{
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int bearer_id = n->active_links[sel & 1];
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if (unlikely(bearer_id == INVALID_BEARER_ID))
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return NULL;
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return n->links[bearer_id].link;
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}
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static inline unsigned int tipc_node_get_mtu(struct net *net, u32 addr, u32 sel)
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{
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struct tipc_node *n;
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int bearer_id;
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unsigned int mtu = MAX_MSG_SIZE;
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n = tipc_node_find(net, addr);
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if (unlikely(!n))
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return mtu;
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bearer_id = n->active_links[sel & 1];
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if (likely(bearer_id != INVALID_BEARER_ID))
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mtu = n->links[bearer_id].mtu;
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tipc_node_put(n);
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return mtu;
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}
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#endif
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