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We convert packet/message reception according to the same principle we have been using for message sending and timeout handling: We move the function tipc_rcv() to node.c, hence handling the initial packet reception at the link aggregation level. The function grabs the node lock, selects the receiving link, and accesses it via a new call tipc_link_rcv(). This function appends buffers to the input queue for delivery upwards, but it may also append outgoing packets to the xmit queue, just as we do during regular message sending. The latter will happen when buffers are forwarded from the link backlog, or when retransmission is requested. Upon return of this function, and after having released the node lock, tipc_rcv() delivers/tranmsits the contents of those queues, but it may also perform actions such as link activation or reset, as indicated by the return flags from the link. This reduces the number of cpu cycles spent inside the node spinlock, and reduces contention on that lock. 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>
223 lines
7.6 KiB
C
223 lines
7.6 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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/* Node FSM states and events:
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*/
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enum {
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SELF_DOWN_PEER_DOWN = 0xdd,
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SELF_UP_PEER_UP = 0xaa,
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SELF_DOWN_PEER_LEAVING = 0xd1,
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SELF_UP_PEER_COMING = 0xac,
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SELF_COMING_PEER_UP = 0xca,
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SELF_LEAVING_PEER_DOWN = 0x1d,
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};
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enum {
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SELF_ESTABL_CONTACT_EVT = 0xec,
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SELF_LOST_CONTACT_EVT = 0x1c,
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PEER_ESTABL_CONTACT_EVT = 0xfec,
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PEER_LOST_CONTACT_EVT = 0xf1c
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};
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/* Flags used to take different actions according to flag type
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* TIPC_WAIT_PEER_LINKS_DOWN: wait to see that peer's links are down
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* TIPC_WAIT_OWN_LINKS_DOWN: wait until peer node is declared down
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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_MSG_EVT = 1,
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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_WAKEUP_BCAST_USERS = (1 << 5),
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TIPC_NOTIFY_LINK_UP = (1 << 6),
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TIPC_NOTIFY_LINK_DOWN = (1 << 7),
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TIPC_NAMED_MSG_EVT = (1 << 8),
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TIPC_BCAST_MSG_EVT = (1 << 9),
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TIPC_BCAST_RESET = (1 << 10)
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};
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/**
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* struct tipc_node_bclink - TIPC node bclink structure
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* @acked: sequence # of last outbound b'cast message acknowledged by node
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* @last_in: sequence # of last in-sequence b'cast message received from node
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* @last_sent: sequence # of last b'cast message sent by node
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* @oos_state: state tracker for handling OOS b'cast messages
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* @deferred_queue: deferred queue saved OOS b'cast message received from node
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* @reasm_buf: broadcast reassembly queue head from node
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* @inputq_map: bitmap indicating which inqueues should be kicked
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* @recv_permitted: true if node is allowed to receive b'cast messages
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*/
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struct tipc_node_bclink {
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u32 acked;
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u32 last_in;
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u32 last_sent;
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u32 oos_state;
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u32 deferred_size;
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struct sk_buff_head deferdq;
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struct sk_buff *reasm_buf;
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struct sk_buff_head namedq;
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bool recv_permitted;
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};
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struct tipc_link_entry {
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struct tipc_link *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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/**
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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: spinlock 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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* @bclink: broadcast-related info
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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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spinlock_t lock;
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struct net *net;
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struct hlist_node hash;
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struct sk_buff_head *inputq;
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struct sk_buff_head *namedq;
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int active_links[2];
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struct tipc_link_entry links[MAX_BEARERS];
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int action_flags;
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struct tipc_node_bclink bclink;
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struct list_head list;
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int state;
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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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struct tipc_node *tipc_node_create(struct net *net, u32 addr);
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void tipc_node_stop(struct net *net);
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void tipc_node_check_dest(struct tipc_node *n, struct tipc_bearer *bearer,
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bool *link_up, bool *addr_match,
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struct tipc_media_addr *maddr);
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bool tipc_node_update_dest(struct tipc_node *n, struct tipc_bearer *bearer,
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struct tipc_media_addr *maddr);
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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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void tipc_node_link_down(struct tipc_node *n_ptr, int bearer_id);
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void tipc_node_link_up(struct tipc_node *n_ptr, int bearer_id);
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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_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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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 void tipc_node_lock(struct tipc_node *node)
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{
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spin_lock_bh(&node->lock);
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}
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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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