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authorroot <root@artemis.panaceas.org>2015-12-25 04:40:36 +0000
committerroot <root@artemis.panaceas.org>2015-12-25 04:40:36 +0000
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tree6135abc790ca67dedbe07c39806591e70eda81ce /net/tipc/node.h
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+/*
+ * net/tipc/node.h: Include file for TIPC node management routines
+ *
+ * Copyright (c) 2000-2006, Ericsson AB
+ * Copyright (c) 2005, 2010-2011, Wind River Systems
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the names of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _TIPC_NODE_H
+#define _TIPC_NODE_H
+
+#include "node_subscr.h"
+#include "addr.h"
+#include "net.h"
+#include "bearer.h"
+
+/**
+ * struct tipc_node - TIPC node structure
+ * @addr: network address of node
+ * @lock: spinlock governing access to structure
+ * @hash: links to adjacent nodes in unsorted hash chain
+ * @list: links to adjacent nodes in sorted list of cluster's nodes
+ * @nsub: list of "node down" subscriptions monitoring node
+ * @active_links: pointers to active links to node
+ * @links: pointers to all links to node
+ * @working_links: number of working links to node (both active and standby)
+ * @cleanup_required: non-zero if cleaning up after a prior loss of contact
+ * @link_cnt: number of links to node
+ * @permit_changeover: non-zero if node has redundant links to this system
+ * @bclink: broadcast-related info
+ * @supported: non-zero if node supports TIPC b'cast capability
+ * @acked: sequence # of last outbound b'cast message acknowledged by node
+ * @last_in: sequence # of last in-sequence b'cast message received from node
+ * @gap_after: sequence # of last message not requiring a NAK request
+ * @gap_to: sequence # of last message requiring a NAK request
+ * @nack_sync: counter that determines when NAK requests should be sent
+ * @deferred_head: oldest OOS b'cast message received from node
+ * @deferred_tail: newest OOS b'cast message received from node
+ * @defragm: list of partially reassembled b'cast message fragments from node
+ */
+
+struct tipc_node {
+ u32 addr;
+ spinlock_t lock;
+ struct hlist_node hash;
+ struct list_head list;
+ struct list_head nsub;
+ struct link *active_links[2];
+ struct link *links[MAX_BEARERS];
+ int link_cnt;
+ int working_links;
+ int cleanup_required;
+ int permit_changeover;
+ struct {
+ int supported;
+ u32 acked;
+ u32 last_in;
+ u32 gap_after;
+ u32 gap_to;
+ u32 nack_sync;
+ struct sk_buff *deferred_head;
+ struct sk_buff *deferred_tail;
+ struct sk_buff *defragm;
+ } bclink;
+};
+
+#define NODE_HTABLE_SIZE 512
+extern struct list_head tipc_node_list;
+
+/*
+ * A trivial power-of-two bitmask technique is used for speed, since this
+ * operation is done for every incoming TIPC packet. The number of hash table
+ * entries has been chosen so that no hash chain exceeds 8 nodes and will
+ * usually be much smaller (typically only a single node).
+ */
+static inline unsigned int tipc_hashfn(u32 addr)
+{
+ return addr & (NODE_HTABLE_SIZE - 1);
+}
+
+extern u32 tipc_own_tag;
+
+struct tipc_node *tipc_node_find(u32 addr);
+struct tipc_node *tipc_node_create(u32 addr);
+void tipc_node_delete(struct tipc_node *n_ptr);
+void tipc_node_attach_link(struct tipc_node *n_ptr, struct link *l_ptr);
+void tipc_node_detach_link(struct tipc_node *n_ptr, struct link *l_ptr);
+void tipc_node_link_down(struct tipc_node *n_ptr, struct link *l_ptr);
+void tipc_node_link_up(struct tipc_node *n_ptr, struct link *l_ptr);
+int tipc_node_active_links(struct tipc_node *n_ptr);
+int tipc_node_redundant_links(struct tipc_node *n_ptr);
+int tipc_node_is_up(struct tipc_node *n_ptr);
+struct sk_buff *tipc_node_get_links(const void *req_tlv_area, int req_tlv_space);
+struct sk_buff *tipc_node_get_nodes(const void *req_tlv_area, int req_tlv_space);
+
+static inline void tipc_node_lock(struct tipc_node *n_ptr)
+{
+ spin_lock_bh(&n_ptr->lock);
+}
+
+static inline void tipc_node_unlock(struct tipc_node *n_ptr)
+{
+ spin_unlock_bh(&n_ptr->lock);
+}
+
+#endif