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kernel-fxtec-pro1x/net/tipc/bearer.h
Jon Paul Maloy 38504c28a2 tipc: improve and extend media address conversion functions 
TIPC currently handles two media specific addresses: Ethernet MAC
addresses and InfiniBand addresses. Those are kept in three different
formats:

1) A "raw" format as obtained from the device. This format is known
   only by the media specific adapter code in eth_media.c and
   ib_media.c.
2) A "generic" internal format, in the form of struct tipc_media_addr,
   which can be referenced and passed around by the generic media-
   unaware code.
3) A serialized version of the latter, to be conveyed in neighbor
   discovery messages.

Conversion between the three formats can only be done by the media
specific code, so we have function pointers for this purpose in
struct tipc_media. Here, the media adapters can install their own
conversion functions at startup.

We now introduce a new such function, 'raw2addr()', whose purpose
is to convert from format 1 to format 2 above. We also try to as far
as possible uniform commenting, variable names and usage of these
functions, with the purpose of making them more comprehensible.

We can now also remove the function tipc_l2_media_addr_set(), whose
job is done better by the new function.

Finally, we expand the field for serialized addresses (format 3)
in discovery messages from 20 to 32 bytes. This is permitted
according to the spec, and reduces the risk of problems when we
add new media in the future.

Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Reviewed-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-05-14 15:19:48 -04:00

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/*
* net/tipc/bearer.h: Include file for TIPC bearer code
*
* Copyright (c) 1996-2006, 2013, 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_BEARER_H
#define _TIPC_BEARER_H
#include "bcast.h"
#define MAX_BEARERS 2
#define MAX_MEDIA 2
/* Identifiers associated with TIPC message header media address info
* - address info field is 32 bytes long
* - the field's actual content and length is defined per media
* - remaining unused bytes in the field are set to zero
*/
#define TIPC_MEDIA_ADDR_SIZE 32
#define TIPC_MEDIA_TYPE_OFFSET 3
/*
* Identifiers of supported TIPC media types
*/
#define TIPC_MEDIA_TYPE_ETH 1
#define TIPC_MEDIA_TYPE_IB 2
/**
* struct tipc_media_addr - destination address used by TIPC bearers
* @value: address info (format defined by media)
* @media_id: TIPC media type identifier
* @broadcast: non-zero if address is a broadcast address
*/
struct tipc_media_addr {
u8 value[TIPC_MEDIA_ADDR_SIZE];
u8 media_id;
u8 broadcast;
};
struct tipc_bearer;
/**
* struct tipc_media - Media specific info exposed to generic bearer layer
* @send_msg: routine which handles buffer transmission
* @enable_media: routine which enables a media
* @disable_media: routine which disables a media
* @addr2str: convert media address format to string
* @addr2msg: convert from media addr format to discovery msg addr format
* @msg2addr: convert from discovery msg addr format to media addr format
* @raw2addr: convert from raw addr format to media addr format
* @priority: default link (and bearer) priority
* @tolerance: default time (in ms) before declaring link failure
* @window: default window (in packets) before declaring link congestion
* @type_id: TIPC media identifier
* @hwaddr_len: TIPC media address len
* @name: media name
*/
struct tipc_media {
int (*send_msg)(struct sk_buff *buf,
struct tipc_bearer *b_ptr,
struct tipc_media_addr *dest);
int (*enable_media)(struct tipc_bearer *b_ptr);
void (*disable_media)(struct tipc_bearer *b_ptr);
int (*addr2str)(struct tipc_media_addr *addr,
char *strbuf,
int bufsz);
int (*addr2msg)(char *msg, struct tipc_media_addr *addr);
int (*msg2addr)(struct tipc_bearer *b,
struct tipc_media_addr *addr,
char *msg);
int (*raw2addr)(struct tipc_bearer *b,
struct tipc_media_addr *addr,
char *raw);
u32 priority;
u32 tolerance;
u32 window;
u32 type_id;
u32 hwaddr_len;
char name[TIPC_MAX_MEDIA_NAME];
};
/**
* struct tipc_bearer - Generic TIPC bearer structure
* @media_ptr: pointer to additional media-specific information about bearer
* @mtu: max packet size bearer can support
* @addr: media-specific address associated with bearer
* @name: bearer name (format = media:interface)
* @media: ptr to media structure associated with bearer
* @bcast_addr: media address used in broadcasting
* @rcu: rcu struct for tipc_bearer
* @priority: default link priority for bearer
* @window: default window size for bearer
* @tolerance: default link tolerance for bearer
* @domain: network domain to which links can be established
* @identity: array index of this bearer within TIPC bearer array
* @link_req: ptr to (optional) structure making periodic link setup requests
* @net_plane: network plane ('A' through 'H') currently associated with bearer
* @nodes: indicates which nodes in cluster can be reached through bearer
*
* Note: media-specific code is responsible for initialization of the fields
* indicated below when a bearer is enabled; TIPC's generic bearer code takes
* care of initializing all other fields.
*/
struct tipc_bearer {
void __rcu *media_ptr; /* initalized by media */
u32 mtu; /* initalized by media */
struct tipc_media_addr addr; /* initalized by media */
char name[TIPC_MAX_BEARER_NAME];
struct tipc_media *media;
struct tipc_media_addr bcast_addr;
struct rcu_head rcu;
u32 priority;
u32 window;
u32 tolerance;
u32 domain;
u32 identity;
struct tipc_link_req *link_req;
char net_plane;
struct tipc_node_map nodes;
};
struct tipc_bearer_names {
char media_name[TIPC_MAX_MEDIA_NAME];
char if_name[TIPC_MAX_IF_NAME];
};
struct tipc_link;
extern struct tipc_bearer __rcu *bearer_list[];
/*
* TIPC routines available to supported media types
*/
void tipc_rcv(struct sk_buff *buf, struct tipc_bearer *tb_ptr);
int tipc_enable_bearer(const char *bearer_name, u32 disc_domain, u32 priority);
int tipc_disable_bearer(const char *name);
/*
* Routines made available to TIPC by supported media types
*/
extern struct tipc_media eth_media_info;
#ifdef CONFIG_TIPC_MEDIA_IB
extern struct tipc_media ib_media_info;
#endif
int tipc_media_set_priority(const char *name, u32 new_value);
int tipc_media_set_window(const char *name, u32 new_value);
void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a);
struct sk_buff *tipc_media_get_names(void);
int tipc_enable_l2_media(struct tipc_bearer *b);
void tipc_disable_l2_media(struct tipc_bearer *b);
int tipc_l2_send_msg(struct sk_buff *buf, struct tipc_bearer *b,
struct tipc_media_addr *dest);
struct sk_buff *tipc_bearer_get_names(void);
void tipc_bearer_add_dest(u32 bearer_id, u32 dest);
void tipc_bearer_remove_dest(u32 bearer_id, u32 dest);
struct tipc_bearer *tipc_bearer_find(const char *name);
struct tipc_media *tipc_media_find(const char *name);
int tipc_bearer_setup(void);
void tipc_bearer_cleanup(void);
void tipc_bearer_stop(void);
void tipc_bearer_send(u32 bearer_id, struct sk_buff *buf,
struct tipc_media_addr *dest);
#endif /* _TIPC_BEARER_H */
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