forked from Minki/linux
2d627b92fd
Combines two distinct structures containing information about a TIPC bearer into a single structure. The structures were previously kept separate so that public information about a bearer could be made available to plug-in media types using TIPC's native API, while the remaining information was kept private for use by TIPC itself. However, now that the native API has been removed there is no longer any need for this arrangement. Since one of the structures was already embedded within the other, the change largely involves replacing instances of "publ.foo" with "foo". The changes do not otherwise alter the operation of TIPC bearers. Signed-off-by: Allan Stephens <Allan.Stephens@windriver.com> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
219 lines
8.0 KiB
C
219 lines
8.0 KiB
C
/*
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* net/tipc/bearer.h: Include file for TIPC bearer code
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*
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* Copyright (c) 1996-2006, Ericsson AB
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* Copyright (c) 2005, 2010-2011, Wind River Systems
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _TIPC_BEARER_H
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#define _TIPC_BEARER_H
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#include "bcast.h"
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#define MAX_BEARERS 8
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#define MAX_MEDIA 4
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/*
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* Identifiers of supported TIPC media types
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*/
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#define TIPC_MEDIA_TYPE_ETH 1
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/*
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* Destination address structure used by TIPC bearers when sending messages
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*
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* IMPORTANT: The fields of this structure MUST be stored using the specified
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* byte order indicated below, as the structure is exchanged between nodes
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* as part of a link setup process.
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*/
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struct tipc_media_addr {
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__be32 type; /* bearer type (network byte order) */
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union {
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__u8 eth_addr[6]; /* 48 bit Ethernet addr (byte array) */
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} dev_addr;
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};
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struct tipc_bearer;
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/**
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* struct media - TIPC media information available to internal users
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* @send_msg: routine which handles buffer transmission
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* @enable_bearer: routine which enables a bearer
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* @disable_bearer: routine which disables a bearer
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* @addr2str: routine which converts bearer's address to string form
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* @bcast_addr: media address used in broadcasting
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* @bcast: non-zero if media supports broadcasting [currently mandatory]
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* @priority: default link (and bearer) priority
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* @tolerance: default time (in ms) before declaring link failure
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* @window: default window (in packets) before declaring link congestion
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* @type_id: TIPC media identifier
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* @name: media name
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*/
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struct media {
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int (*send_msg)(struct sk_buff *buf,
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struct tipc_bearer *b_ptr,
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struct tipc_media_addr *dest);
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int (*enable_bearer)(struct tipc_bearer *b_ptr);
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void (*disable_bearer)(struct tipc_bearer *b_ptr);
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char *(*addr2str)(struct tipc_media_addr *a,
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char *str_buf, int str_size);
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struct tipc_media_addr bcast_addr;
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int bcast;
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u32 priority;
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u32 tolerance;
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u32 window;
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u32 type_id;
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char name[TIPC_MAX_MEDIA_NAME];
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};
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/**
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* struct tipc_bearer - TIPC bearer structure
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* @usr_handle: pointer to additional media-specific information about bearer
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* @mtu: max packet size bearer can support
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* @blocked: non-zero if bearer is blocked
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* @lock: spinlock for controlling access to bearer
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* @addr: media-specific address associated with bearer
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* @name: bearer name (format = media:interface)
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* @media: ptr to media structure associated with bearer
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* @priority: default link priority for bearer
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* @detect_scope: network address mask used during automatic link creation
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* @identity: array index of this bearer within TIPC bearer array
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* @link_req: ptr to (optional) structure making periodic link setup requests
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* @links: list of non-congested links associated with bearer
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* @cong_links: list of congested links associated with bearer
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* @continue_count: # of times bearer has resumed after congestion or blocking
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* @active: non-zero if bearer structure is represents a bearer
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* @net_plane: network plane ('A' through 'H') currently associated with bearer
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* @nodes: indicates which nodes in cluster can be reached through bearer
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*
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* Note: media-specific code is responsible for initialization of the fields
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* indicated below when a bearer is enabled; TIPC's generic bearer code takes
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* care of initializing all other fields.
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*/
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struct tipc_bearer {
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void *usr_handle; /* initalized by media */
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u32 mtu; /* initalized by media */
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int blocked; /* initalized by media */
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struct tipc_media_addr addr; /* initalized by media */
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char name[TIPC_MAX_BEARER_NAME];
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spinlock_t lock;
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struct media *media;
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u32 priority;
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u32 detect_scope;
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u32 identity;
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struct link_req *link_req;
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struct list_head links;
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struct list_head cong_links;
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u32 continue_count;
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int active;
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char net_plane;
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struct tipc_node_map nodes;
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};
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struct bearer_name {
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char media_name[TIPC_MAX_MEDIA_NAME];
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char if_name[TIPC_MAX_IF_NAME];
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};
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struct link;
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extern struct tipc_bearer tipc_bearers[];
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/*
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* TIPC routines available to supported media types
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*/
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int tipc_register_media(u32 media_type,
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char *media_name, int (*enable)(struct tipc_bearer *),
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void (*disable)(struct tipc_bearer *),
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int (*send_msg)(struct sk_buff *,
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struct tipc_bearer *, struct tipc_media_addr *),
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char *(*addr2str)(struct tipc_media_addr *a,
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char *str_buf, int str_size),
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struct tipc_media_addr *bcast_addr, const u32 bearer_priority,
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const u32 link_tolerance, /* [ms] */
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const u32 send_window_limit);
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void tipc_recv_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr);
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int tipc_block_bearer(const char *name);
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void tipc_continue(struct tipc_bearer *tb_ptr);
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int tipc_enable_bearer(const char *bearer_name, u32 bcast_scope, u32 priority);
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int tipc_disable_bearer(const char *name);
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/*
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* Routines made available to TIPC by supported media types
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*/
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int tipc_eth_media_start(void);
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void tipc_eth_media_stop(void);
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void tipc_media_addr_printf(struct print_buf *pb, struct tipc_media_addr *a);
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struct sk_buff *tipc_media_get_names(void);
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struct sk_buff *tipc_bearer_get_names(void);
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void tipc_bearer_add_dest(struct tipc_bearer *b_ptr, u32 dest);
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void tipc_bearer_remove_dest(struct tipc_bearer *b_ptr, u32 dest);
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void tipc_bearer_schedule(struct tipc_bearer *b_ptr, struct link *l_ptr);
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struct tipc_bearer *tipc_bearer_find_interface(const char *if_name);
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int tipc_bearer_resolve_congestion(struct tipc_bearer *b_ptr, struct link *l_ptr);
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int tipc_bearer_congested(struct tipc_bearer *b_ptr, struct link *l_ptr);
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void tipc_bearer_stop(void);
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void tipc_bearer_lock_push(struct tipc_bearer *b_ptr);
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/**
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* tipc_bearer_send- sends buffer to destination over bearer
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*
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* Returns true (1) if successful, or false (0) if unable to send
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*
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* IMPORTANT:
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* The media send routine must not alter the buffer being passed in
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* as it may be needed for later retransmission!
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*
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* If the media send routine returns a non-zero value (indicating that
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* it was unable to send the buffer), it must:
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* 1) mark the bearer as blocked,
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* 2) call tipc_continue() once the bearer is able to send again.
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* Media types that are unable to meet these two critera must ensure their
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* send routine always returns success -- even if the buffer was not sent --
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* and let TIPC's link code deal with the undelivered message.
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*/
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static inline int tipc_bearer_send(struct tipc_bearer *b_ptr,
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struct sk_buff *buf,
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struct tipc_media_addr *dest)
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{
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return !b_ptr->media->send_msg(buf, b_ptr, dest);
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}
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#endif /* _TIPC_BEARER_H */
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