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-rw-r--r--net/tipc/net.c74
1 files changed, 37 insertions, 37 deletions
diff --git a/net/tipc/net.c b/net/tipc/net.c
index a991bf8a7f74..c39c76201e8e 100644
--- a/net/tipc/net.c
+++ b/net/tipc/net.c
@@ -1,6 +1,6 @@
1/* 1/*
2 * net/tipc/net.c: TIPC network routing code 2 * net/tipc/net.c: TIPC network routing code
3 * 3 *
4 * Copyright (c) 1995-2006, Ericsson AB 4 * Copyright (c) 1995-2006, Ericsson AB
5 * Copyright (c) 2005, Wind River Systems 5 * Copyright (c) 2005, Wind River Systems
6 * All rights reserved. 6 * All rights reserved.
@@ -49,63 +49,63 @@
49#include "discover.h" 49#include "discover.h"
50#include "config.h" 50#include "config.h"
51 51
52/* 52/*
53 * The TIPC locking policy is designed to ensure a very fine locking 53 * The TIPC locking policy is designed to ensure a very fine locking
54 * granularity, permitting complete parallel access to individual 54 * granularity, permitting complete parallel access to individual
55 * port and node/link instances. The code consists of three major 55 * port and node/link instances. The code consists of three major
56 * locking domains, each protected with their own disjunct set of locks. 56 * locking domains, each protected with their own disjunct set of locks.
57 * 57 *
58 * 1: The routing hierarchy. 58 * 1: The routing hierarchy.
59 * Comprises the structures 'zone', 'cluster', 'node', 'link' 59 * Comprises the structures 'zone', 'cluster', 'node', 'link'
60 * and 'bearer'. The whole hierarchy is protected by a big 60 * and 'bearer'. The whole hierarchy is protected by a big
61 * read/write lock, tipc_net_lock, to enssure that nothing is added 61 * read/write lock, tipc_net_lock, to enssure that nothing is added
62 * or removed while code is accessing any of these structures. 62 * or removed while code is accessing any of these structures.
63 * This layer must not be called from the two others while they 63 * This layer must not be called from the two others while they
64 * hold any of their own locks. 64 * hold any of their own locks.
65 * Neither must it itself do any upcalls to the other two before 65 * Neither must it itself do any upcalls to the other two before
66 * it has released tipc_net_lock and other protective locks. 66 * it has released tipc_net_lock and other protective locks.
67 * 67 *
68 * Within the tipc_net_lock domain there are two sub-domains;'node' and 68 * Within the tipc_net_lock domain there are two sub-domains;'node' and
69 * 'bearer', where local write operations are permitted, 69 * 'bearer', where local write operations are permitted,
70 * provided that those are protected by individual spin_locks 70 * provided that those are protected by individual spin_locks
71 * per instance. Code holding tipc_net_lock(read) and a node spin_lock 71 * per instance. Code holding tipc_net_lock(read) and a node spin_lock
72 * is permitted to poke around in both the node itself and its 72 * is permitted to poke around in both the node itself and its
73 * subordinate links. I.e, it can update link counters and queues, 73 * subordinate links. I.e, it can update link counters and queues,
74 * change link state, send protocol messages, and alter the 74 * change link state, send protocol messages, and alter the
75 * "active_links" array in the node; but it can _not_ remove a link 75 * "active_links" array in the node; but it can _not_ remove a link
76 * or a node from the overall structure. 76 * or a node from the overall structure.
77 * Correspondingly, individual bearers may change status within a 77 * Correspondingly, individual bearers may change status within a
78 * tipc_net_lock(read), protected by an individual spin_lock ber bearer 78 * tipc_net_lock(read), protected by an individual spin_lock ber bearer
79 * instance, but it needs tipc_net_lock(write) to remove/add any bearers. 79 * instance, but it needs tipc_net_lock(write) to remove/add any bearers.
80 *
81 * 80 *
82 * 2: The transport level of the protocol. 81 *
83 * This consists of the structures port, (and its user level 82 * 2: The transport level of the protocol.
84 * representations, such as user_port and tipc_sock), reference and 83 * This consists of the structures port, (and its user level
85 * tipc_user (port.c, reg.c, socket.c). 84 * representations, such as user_port and tipc_sock), reference and
85 * tipc_user (port.c, reg.c, socket.c).
86 * 86 *
87 * This layer has four different locks: 87 * This layer has four different locks:
88 * - The tipc_port spin_lock. This is protecting each port instance 88 * - The tipc_port spin_lock. This is protecting each port instance
89 * from parallel data access and removal. Since we can not place 89 * from parallel data access and removal. Since we can not place
90 * this lock in the port itself, it has been placed in the 90 * this lock in the port itself, it has been placed in the
91 * corresponding reference table entry, which has the same life 91 * corresponding reference table entry, which has the same life
92 * cycle as the module. This entry is difficult to access from 92 * cycle as the module. This entry is difficult to access from
93 * outside the TIPC core, however, so a pointer to the lock has 93 * outside the TIPC core, however, so a pointer to the lock has
94 * been added in the port instance, -to be used for unlocking 94 * been added in the port instance, -to be used for unlocking
95 * only. 95 * only.
96 * - A read/write lock to protect the reference table itself (teg.c). 96 * - A read/write lock to protect the reference table itself (teg.c).
97 * (Nobody is using read-only access to this, so it can just as 97 * (Nobody is using read-only access to this, so it can just as
98 * well be changed to a spin_lock) 98 * well be changed to a spin_lock)
99 * - A spin lock to protect the registry of kernel/driver users (reg.c) 99 * - A spin lock to protect the registry of kernel/driver users (reg.c)
100 * - A global spin_lock (tipc_port_lock), which only task is to ensure 100 * - A global spin_lock (tipc_port_lock), which only task is to ensure
101 * consistency where more than one port is involved in an operation, 101 * consistency where more than one port is involved in an operation,
102 * i.e., whe a port is part of a linked list of ports. 102 * i.e., whe a port is part of a linked list of ports.
103 * There are two such lists; 'port_list', which is used for management, 103 * There are two such lists; 'port_list', which is used for management,
104 * and 'wait_list', which is used to queue ports during congestion. 104 * and 'wait_list', which is used to queue ports during congestion.
105 * 105 *
106 * 3: The name table (name_table.c, name_distr.c, subscription.c) 106 * 3: The name table (name_table.c, name_distr.c, subscription.c)
107 * - There is one big read/write-lock (tipc_nametbl_lock) protecting the 107 * - There is one big read/write-lock (tipc_nametbl_lock) protecting the
108 * overall name table structure. Nothing must be added/removed to 108 * overall name table structure. Nothing must be added/removed to
109 * this structure without holding write access to it. 109 * this structure without holding write access to it.
110 * - There is one local spin_lock per sub_sequence, which can be seen 110 * - There is one local spin_lock per sub_sequence, which can be seen
111 * as a sub-domain to the tipc_nametbl_lock domain. It is used only 111 * as a sub-domain to the tipc_nametbl_lock domain. It is used only
@@ -118,7 +118,7 @@
118DEFINE_RWLOCK(tipc_net_lock); 118DEFINE_RWLOCK(tipc_net_lock);
119struct network tipc_net = { NULL }; 119struct network tipc_net = { NULL };
120 120
121struct node *tipc_net_select_remote_node(u32 addr, u32 ref) 121struct node *tipc_net_select_remote_node(u32 addr, u32 ref)
122{ 122{
123 return tipc_zone_select_remote_node(tipc_net.zones[tipc_zone(addr)], addr, ref); 123 return tipc_zone_select_remote_node(tipc_net.zones[tipc_zone(addr)], addr, ref);
124} 124}
@@ -224,7 +224,7 @@ void tipc_net_route_msg(struct sk_buff *buf)
224 buf_discard(buf); 224 buf_discard(buf);
225 } else { 225 } else {
226 msg_dbg(msg, "NET>REJ>:"); 226 msg_dbg(msg, "NET>REJ>:");
227 tipc_reject_msg(buf, msg_destport(msg) ? 227 tipc_reject_msg(buf, msg_destport(msg) ?
228 TIPC_ERR_NO_PORT : TIPC_ERR_NO_NAME); 228 TIPC_ERR_NO_PORT : TIPC_ERR_NO_NAME);
229 } 229 }
230 return; 230 return;
@@ -236,7 +236,7 @@ void tipc_net_route_msg(struct sk_buff *buf)
236 dnode = msg_short(msg) ? tipc_own_addr : msg_destnode(msg); 236 dnode = msg_short(msg) ? tipc_own_addr : msg_destnode(msg);
237 if (in_scope(dnode, tipc_own_addr)) { 237 if (in_scope(dnode, tipc_own_addr)) {
238 if (msg_isdata(msg)) { 238 if (msg_isdata(msg)) {
239 if (msg_mcast(msg)) 239 if (msg_mcast(msg))
240 tipc_port_recv_mcast(buf, NULL); 240 tipc_port_recv_mcast(buf, NULL);
241 else if (msg_destport(msg)) 241 else if (msg_destport(msg))
242 tipc_port_recv_msg(buf); 242 tipc_port_recv_msg(buf);
@@ -284,7 +284,7 @@ int tipc_net_start(void)
284 (res = tipc_bclink_init())) { 284 (res = tipc_bclink_init())) {
285 return res; 285 return res;
286 } 286 }
287 tipc_subscr_stop(); 287 tipc_subscr_stop();
288 tipc_cfg_stop(); 288 tipc_cfg_stop();
289 tipc_k_signal((Handler)tipc_subscr_start, 0); 289 tipc_k_signal((Handler)tipc_subscr_start, 0);
290 tipc_k_signal((Handler)tipc_cfg_init, 0); 290 tipc_k_signal((Handler)tipc_cfg_init, 0);
@@ -298,12 +298,12 @@ void tipc_net_stop(void)
298{ 298{
299 if (tipc_mode != TIPC_NET_MODE) 299 if (tipc_mode != TIPC_NET_MODE)
300 return; 300 return;
301 write_lock_bh(&tipc_net_lock); 301 write_lock_bh(&tipc_net_lock);
302 tipc_bearer_stop(); 302 tipc_bearer_stop();
303 tipc_mode = TIPC_NODE_MODE; 303 tipc_mode = TIPC_NODE_MODE;
304 tipc_bclink_stop(); 304 tipc_bclink_stop();
305 net_stop(); 305 net_stop();
306 write_unlock_bh(&tipc_net_lock); 306 write_unlock_bh(&tipc_net_lock);
307 info("Left network mode \n"); 307 info("Left network mode \n");
308} 308}
309 309