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Per Lidenb97bf3f2006-01-02 19:04:38 +01001/*
2 * net/tipc/bearer.h: Include file for TIPC bearer code
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09003 *
Per Liden593a5f22006-01-11 19:14:19 +01004 * Copyright (c) 1996-2006, Ericsson AB
Allan Stephens2d627b92011-01-07 13:00:11 -05005 * Copyright (c) 2005, 2010-2011, Wind River Systems
Per Lidenb97bf3f2006-01-02 19:04:38 +01006 * All rights reserved.
7 *
Per Liden9ea1fd32006-01-11 13:30:43 +01008 * Redistribution and use in source and binary forms, with or without
Per Lidenb97bf3f2006-01-02 19:04:38 +01009 * modification, are permitted provided that the following conditions are met:
10 *
Per Liden9ea1fd32006-01-11 13:30:43 +010011 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
Per Lidenb97bf3f2006-01-02 19:04:38 +010019 *
Per Liden9ea1fd32006-01-11 13:30:43 +010020 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
Per Lidenb97bf3f2006-01-02 19:04:38 +010034 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#ifndef _TIPC_BEARER_H
38#define _TIPC_BEARER_H
39
Per Lidenb97bf3f2006-01-02 19:04:38 +010040#include "bcast.h"
41
42#define MAX_BEARERS 8
43#define MAX_MEDIA 4
44
Allan Stephensd265fef2010-11-30 12:00:53 +000045/*
46 * Identifiers of supported TIPC media types
47 */
48#define TIPC_MEDIA_TYPE_ETH 1
49
50/*
51 * Destination address structure used by TIPC bearers when sending messages
52 *
53 * IMPORTANT: The fields of this structure MUST be stored using the specified
54 * byte order indicated below, as the structure is exchanged between nodes
55 * as part of a link setup process.
56 */
57struct tipc_media_addr {
58 __be32 type; /* bearer type (network byte order) */
59 union {
60 __u8 eth_addr[6]; /* 48 bit Ethernet addr (byte array) */
61 } dev_addr;
62};
63
Allan Stephens2d627b92011-01-07 13:00:11 -050064struct tipc_bearer;
Per Lidenb97bf3f2006-01-02 19:04:38 +010065
66/**
67 * struct media - TIPC media information available to internal users
68 * @send_msg: routine which handles buffer transmission
69 * @enable_bearer: routine which enables a bearer
70 * @disable_bearer: routine which disables a bearer
71 * @addr2str: routine which converts bearer's address to string form
72 * @bcast_addr: media address used in broadcasting
Per Lidenb97bf3f2006-01-02 19:04:38 +010073 * @priority: default link (and bearer) priority
74 * @tolerance: default time (in ms) before declaring link failure
75 * @window: default window (in packets) before declaring link congestion
Allan Stephensd265fef2010-11-30 12:00:53 +000076 * @type_id: TIPC media identifier
Per Lidenb97bf3f2006-01-02 19:04:38 +010077 * @name: media name
78 */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090079
Per Lidenb97bf3f2006-01-02 19:04:38 +010080struct media {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090081 int (*send_msg)(struct sk_buff *buf,
Per Lidenb97bf3f2006-01-02 19:04:38 +010082 struct tipc_bearer *b_ptr,
83 struct tipc_media_addr *dest);
84 int (*enable_bearer)(struct tipc_bearer *b_ptr);
85 void (*disable_bearer)(struct tipc_bearer *b_ptr);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090086 char *(*addr2str)(struct tipc_media_addr *a,
Per Lidenb97bf3f2006-01-02 19:04:38 +010087 char *str_buf, int str_size);
88 struct tipc_media_addr bcast_addr;
Per Lidenb97bf3f2006-01-02 19:04:38 +010089 u32 priority;
90 u32 tolerance;
91 u32 window;
92 u32 type_id;
93 char name[TIPC_MAX_MEDIA_NAME];
94};
95
96/**
Allan Stephens2d627b92011-01-07 13:00:11 -050097 * struct tipc_bearer - TIPC bearer structure
98 * @usr_handle: pointer to additional media-specific information about bearer
99 * @mtu: max packet size bearer can support
100 * @blocked: non-zero if bearer is blocked
101 * @lock: spinlock for controlling access to bearer
102 * @addr: media-specific address associated with bearer
103 * @name: bearer name (format = media:interface)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100104 * @media: ptr to media structure associated with bearer
105 * @priority: default link priority for bearer
Per Lidenb97bf3f2006-01-02 19:04:38 +0100106 * @identity: array index of this bearer within TIPC bearer array
107 * @link_req: ptr to (optional) structure making periodic link setup requests
108 * @links: list of non-congested links associated with bearer
109 * @cong_links: list of congested links associated with bearer
Per Lidenb97bf3f2006-01-02 19:04:38 +0100110 * @active: non-zero if bearer structure is represents a bearer
111 * @net_plane: network plane ('A' through 'H') currently associated with bearer
112 * @nodes: indicates which nodes in cluster can be reached through bearer
Allan Stephens2d627b92011-01-07 13:00:11 -0500113 *
114 * Note: media-specific code is responsible for initialization of the fields
115 * indicated below when a bearer is enabled; TIPC's generic bearer code takes
116 * care of initializing all other fields.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100117 */
Allan Stephens2d627b92011-01-07 13:00:11 -0500118struct tipc_bearer {
119 void *usr_handle; /* initalized by media */
120 u32 mtu; /* initalized by media */
121 int blocked; /* initalized by media */
122 struct tipc_media_addr addr; /* initalized by media */
123 char name[TIPC_MAX_BEARER_NAME];
124 spinlock_t lock;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100125 struct media *media;
126 u32 priority;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100127 u32 identity;
128 struct link_req *link_req;
129 struct list_head links;
130 struct list_head cong_links;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100131 int active;
132 char net_plane;
David S. Miller6c000552008-09-02 23:38:32 -0700133 struct tipc_node_map nodes;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100134};
135
136struct bearer_name {
137 char media_name[TIPC_MAX_MEDIA_NAME];
138 char if_name[TIPC_MAX_IF_NAME];
139};
140
141struct link;
142
Allan Stephens2d627b92011-01-07 13:00:11 -0500143extern struct tipc_bearer tipc_bearers[];
Per Lidenb97bf3f2006-01-02 19:04:38 +0100144
Allan Stephensd265fef2010-11-30 12:00:53 +0000145/*
146 * TIPC routines available to supported media types
147 */
148int tipc_register_media(u32 media_type,
149 char *media_name, int (*enable)(struct tipc_bearer *),
150 void (*disable)(struct tipc_bearer *),
151 int (*send_msg)(struct sk_buff *,
152 struct tipc_bearer *, struct tipc_media_addr *),
153 char *(*addr2str)(struct tipc_media_addr *a,
154 char *str_buf, int str_size),
155 struct tipc_media_addr *bcast_addr, const u32 bearer_priority,
156 const u32 link_tolerance, /* [ms] */
157 const u32 send_window_limit);
158
159void tipc_recv_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr);
160
161int tipc_block_bearer(const char *name);
162void tipc_continue(struct tipc_bearer *tb_ptr);
163
Allan Stephens50d3e632011-02-28 14:56:15 -0500164int tipc_enable_bearer(const char *bearer_name, u32 disc_domain, u32 priority);
Allan Stephensd265fef2010-11-30 12:00:53 +0000165int tipc_disable_bearer(const char *name);
166
167/*
168 * Routines made available to TIPC by supported media types
169 */
170int tipc_eth_media_start(void);
171void tipc_eth_media_stop(void);
172
Per Liden4323add2006-01-18 00:38:21 +0100173void tipc_media_addr_printf(struct print_buf *pb, struct tipc_media_addr *a);
174struct sk_buff *tipc_media_get_names(void);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100175
Per Liden4323add2006-01-18 00:38:21 +0100176struct sk_buff *tipc_bearer_get_names(void);
Allan Stephens2d627b92011-01-07 13:00:11 -0500177void tipc_bearer_add_dest(struct tipc_bearer *b_ptr, u32 dest);
178void tipc_bearer_remove_dest(struct tipc_bearer *b_ptr, u32 dest);
179void tipc_bearer_schedule(struct tipc_bearer *b_ptr, struct link *l_ptr);
180struct tipc_bearer *tipc_bearer_find_interface(const char *if_name);
181int tipc_bearer_resolve_congestion(struct tipc_bearer *b_ptr, struct link *l_ptr);
182int tipc_bearer_congested(struct tipc_bearer *b_ptr, struct link *l_ptr);
Per Liden4323add2006-01-18 00:38:21 +0100183void tipc_bearer_stop(void);
Allan Stephens2d627b92011-01-07 13:00:11 -0500184void tipc_bearer_lock_push(struct tipc_bearer *b_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100185
186
187/**
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900188 * tipc_bearer_send- sends buffer to destination over bearer
189 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100190 * Returns true (1) if successful, or false (0) if unable to send
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900191 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100192 * IMPORTANT:
193 * The media send routine must not alter the buffer being passed in
194 * as it may be needed for later retransmission!
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900195 *
196 * If the media send routine returns a non-zero value (indicating that
Per Lidenb97bf3f2006-01-02 19:04:38 +0100197 * it was unable to send the buffer), it must:
198 * 1) mark the bearer as blocked,
199 * 2) call tipc_continue() once the bearer is able to send again.
200 * Media types that are unable to meet these two critera must ensure their
201 * send routine always returns success -- even if the buffer was not sent --
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900202 * and let TIPC's link code deal with the undelivered message.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100203 */
204
Allan Stephens2d627b92011-01-07 13:00:11 -0500205static inline int tipc_bearer_send(struct tipc_bearer *b_ptr,
206 struct sk_buff *buf,
Per Liden4323add2006-01-18 00:38:21 +0100207 struct tipc_media_addr *dest)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100208{
Allan Stephens2d627b92011-01-07 13:00:11 -0500209 return !b_ptr->media->send_msg(buf, b_ptr, dest);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100210}
211
Allan Stephensb274f4a2010-05-11 14:30:16 +0000212#endif /* _TIPC_BEARER_H */