16e166b88c
Message fragmentation is currently performed at link level, inside the protection of node_lock. This potentially binds up the sending link structure for a long time, instead of letting it do other tasks, such as handle reception of new packets. In this commit, we make the MTUs of each active link become easily accessible from the socket level, i.e., without taking any spinlock or dereferencing the target link pointer. This way, we make it possible to perform fragmentation in the sending socket, before sending the whole fragment chain to the link for transport. Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Reviewed-by: Erik Hugne <erik.hugne@ericsson.com> Reviewed-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
164 lines
5.7 KiB
C
164 lines
5.7 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, 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 "node_subscr.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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/*
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* Out-of-range value for node signature
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*/
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#define INVALID_NODE_SIG 0x10000
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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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*/
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enum {
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TIPC_WAIT_PEER_LINKS_DOWN = (1 << 1),
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TIPC_WAIT_OWN_LINKS_DOWN = (1 << 2),
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TIPC_NOTIFY_NODE_DOWN = (1 << 3),
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TIPC_NOTIFY_NODE_UP = (1 << 4)
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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_size: number of OOS b'cast messages in deferred queue
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* @deferred_head: oldest OOS b'cast message received from node
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* @deferred_tail: newest OOS b'cast message received from node
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* @reasm_buf: broadcast reassembly queue head from node
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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 *deferred_head;
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struct sk_buff *deferred_tail;
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struct sk_buff *reasm_buf;
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bool recv_permitted;
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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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* @lock: spinlock governing access to structure
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* @hash: links to adjacent nodes in unsorted hash chain
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* @active_links: pointers to active links to node
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* @links: pointers 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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* @signature: node instance identifier
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* @nsub: list of "node down" subscriptions monitoring node
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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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spinlock_t lock;
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struct hlist_node hash;
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struct tipc_link *active_links[2];
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u32 act_mtus[2];
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struct tipc_link *links[MAX_BEARERS];
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unsigned 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 link_cnt;
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int working_links;
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u32 signature;
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struct list_head nsub;
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struct rcu_head rcu;
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};
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extern struct list_head tipc_node_list;
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struct tipc_node *tipc_node_find(u32 addr);
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struct tipc_node *tipc_node_create(u32 addr);
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void tipc_node_stop(void);
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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, struct tipc_link *l_ptr);
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void tipc_node_link_up(struct tipc_node *n_ptr, struct tipc_link *l_ptr);
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int tipc_node_active_links(struct tipc_node *n_ptr);
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int tipc_node_is_up(struct tipc_node *n_ptr);
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struct sk_buff *tipc_node_get_links(const void *req_tlv_area, int req_tlv_space);
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struct sk_buff *tipc_node_get_nodes(const void *req_tlv_area, int req_tlv_space);
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int tipc_node_get_linkname(u32 bearer_id, u32 node, char *linkname, size_t len);
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void tipc_node_unlock(struct tipc_node *node);
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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 bool tipc_node_blocked(struct tipc_node *node)
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{
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return (node->action_flags & (TIPC_WAIT_PEER_LINKS_DOWN |
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TIPC_NOTIFY_NODE_DOWN | TIPC_WAIT_OWN_LINKS_DOWN));
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}
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static inline uint tipc_node_get_mtu(u32 addr, u32 selector)
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{
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struct tipc_node *node;
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u32 mtu;
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node = tipc_node_find(addr);
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if (likely(node))
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mtu = node->act_mtus[selector & 1];
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else
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mtu = MAX_MSG_SIZE;
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return mtu;
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}
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#endif
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