2 * net/tipc/net.c: TIPC network routing code
4 * Copyright (c) 1995-2006, 2014, Ericsson AB
5 * Copyright (c) 2005, 2010-2011, Wind River Systems
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39 #include "name_distr.h"
46 * The TIPC locking policy is designed to ensure a very fine locking
47 * granularity, permitting complete parallel access to individual
48 * port and node/link instances. The code consists of four major
49 * locking domains, each protected with their own disjunct set of locks.
51 * 1: The bearer level.
52 * RTNL lock is used to serialize the process of configuring bearer
53 * on update side, and RCU lock is applied on read side to make
54 * bearer instance valid on both paths of message transmission and
57 * 2: The node and link level.
58 * All node instances are saved into two tipc_node_list and node_htable
59 * lists. The two lists are protected by node_list_lock on write side,
60 * and they are guarded with RCU lock on read side. Especially node
61 * instance is destroyed only when TIPC module is removed, and we can
62 * confirm that there has no any user who is accessing the node at the
63 * moment. Therefore, Except for iterating the two lists within RCU
64 * protection, it's no needed to hold RCU that we access node instance
67 * In addition, all members in node structure including link instances
68 * are protected by node spin lock.
70 * 3: The transport level of the protocol.
71 * This consists of the structures port, (and its user level
72 * representations, such as user_port and tipc_sock), reference and
73 * tipc_user (port.c, reg.c, socket.c).
75 * This layer has four different locks:
76 * - The tipc_port spin_lock. This is protecting each port instance
77 * from parallel data access and removal. Since we can not place
78 * this lock in the port itself, it has been placed in the
79 * corresponding reference table entry, which has the same life
80 * cycle as the module. This entry is difficult to access from
81 * outside the TIPC core, however, so a pointer to the lock has
82 * been added in the port instance, -to be used for unlocking
84 * - A read/write lock to protect the reference table itself (teg.c).
85 * (Nobody is using read-only access to this, so it can just as
86 * well be changed to a spin_lock)
87 * - A spin lock to protect the registry of kernel/driver users (reg.c)
88 * - A global spin_lock (tipc_port_lock), which only task is to ensure
89 * consistency where more than one port is involved in an operation,
90 * i.e., whe a port is part of a linked list of ports.
91 * There are two such lists; 'port_list', which is used for management,
92 * and 'wait_list', which is used to queue ports during congestion.
94 * 4: The name table (name_table.c, name_distr.c, subscription.c)
95 * - There is one big read/write-lock (tipc_nametbl_lock) protecting the
96 * overall name table structure. Nothing must be added/removed to
97 * this structure without holding write access to it.
98 * - There is one local spin_lock per sub_sequence, which can be seen
99 * as a sub-domain to the tipc_nametbl_lock domain. It is used only
100 * for translation operations, and is needed because a translation
101 * steps the root of the 'publication' linked list between each lookup.
102 * This is always used within the scope of a tipc_nametbl_lock(read).
103 * - A local spin_lock protecting the queue of subscriber events.
106 int tipc_net_start(u32 addr
)
108 char addr_string
[16];
111 tipc_own_addr
= addr
;
114 res
= tipc_bclink_init();
118 tipc_nametbl_publish(TIPC_CFG_SRV
, tipc_own_addr
, tipc_own_addr
,
119 TIPC_ZONE_SCOPE
, 0, tipc_own_addr
);
121 pr_info("Started in network mode\n");
122 pr_info("Own node address %s, network identity %u\n",
123 tipc_addr_string_fill(addr_string
, tipc_own_addr
), tipc_net_id
);
127 void tipc_net_stop(void)
132 tipc_nametbl_withdraw(TIPC_CFG_SRV
, tipc_own_addr
, 0, tipc_own_addr
);
139 pr_info("Left network mode\n");
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