170 lines
6.0 KiB
C
170 lines
6.0 KiB
C
|
/*
|
||
|
* net/tipc/bearer.h: Include file for TIPC bearer code
|
||
|
*
|
||
|
* Copyright (c) 2003-2005, Ericsson Research Canada
|
||
|
* Copyright (c) 2005, Wind River Systems
|
||
|
* Copyright (c) 2005-2006, Ericsson AB
|
||
|
* All rights reserved.
|
||
|
*
|
||
|
* Redistribution and use in source and binary forms, with or without
|
||
|
* modification, are permitted provided that the following conditions are met:
|
||
|
*
|
||
|
* Redistributions of source code must retain the above copyright notice, this
|
||
|
* list of conditions and the following disclaimer.
|
||
|
* 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.
|
||
|
* 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.
|
||
|
*
|
||
|
* 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 <net/tipc/tipc_bearer.h>
|
||
|
#include "bcast.h"
|
||
|
|
||
|
#define MAX_BEARERS 8
|
||
|
#define MAX_MEDIA 4
|
||
|
|
||
|
|
||
|
/**
|
||
|
* struct media - TIPC media information available to internal users
|
||
|
* @send_msg: routine which handles buffer transmission
|
||
|
* @enable_bearer: routine which enables a bearer
|
||
|
* @disable_bearer: routine which disables a bearer
|
||
|
* @addr2str: routine which converts bearer's address to string form
|
||
|
* @bcast_addr: media address used in broadcasting
|
||
|
* @bcast: non-zero if media supports broadcasting [currently mandatory]
|
||
|
* @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 [defined in tipc_bearer.h]
|
||
|
* @name: media name
|
||
|
*/
|
||
|
|
||
|
struct media {
|
||
|
int (*send_msg)(struct sk_buff *buf,
|
||
|
struct tipc_bearer *b_ptr,
|
||
|
struct tipc_media_addr *dest);
|
||
|
int (*enable_bearer)(struct tipc_bearer *b_ptr);
|
||
|
void (*disable_bearer)(struct tipc_bearer *b_ptr);
|
||
|
char *(*addr2str)(struct tipc_media_addr *a,
|
||
|
char *str_buf, int str_size);
|
||
|
struct tipc_media_addr bcast_addr;
|
||
|
int bcast;
|
||
|
u32 priority;
|
||
|
u32 tolerance;
|
||
|
u32 window;
|
||
|
u32 type_id;
|
||
|
char name[TIPC_MAX_MEDIA_NAME];
|
||
|
};
|
||
|
|
||
|
/**
|
||
|
* struct bearer - TIPC bearer information available to internal users
|
||
|
* @publ: bearer information available to privileged users
|
||
|
* @media: ptr to media structure associated with bearer
|
||
|
* @priority: default link priority for bearer
|
||
|
* @detect_scope: network address mask used during automatic link creation
|
||
|
* @identity: array index of this bearer within TIPC bearer array
|
||
|
* @link_req: ptr to (optional) structure making periodic link setup requests
|
||
|
* @links: list of non-congested links associated with bearer
|
||
|
* @cong_links: list of congested links associated with bearer
|
||
|
* @continue_count: # of times bearer has resumed after congestion or blocking
|
||
|
* @active: non-zero if bearer structure is represents a bearer
|
||
|
* @net_plane: network plane ('A' through 'H') currently associated with bearer
|
||
|
* @nodes: indicates which nodes in cluster can be reached through bearer
|
||
|
*/
|
||
|
|
||
|
struct bearer {
|
||
|
struct tipc_bearer publ;
|
||
|
struct media *media;
|
||
|
u32 priority;
|
||
|
u32 detect_scope;
|
||
|
u32 identity;
|
||
|
struct link_req *link_req;
|
||
|
struct list_head links;
|
||
|
struct list_head cong_links;
|
||
|
u32 continue_count;
|
||
|
int active;
|
||
|
char net_plane;
|
||
|
struct node_map nodes;
|
||
|
};
|
||
|
|
||
|
struct bearer_name {
|
||
|
char media_name[TIPC_MAX_MEDIA_NAME];
|
||
|
char if_name[TIPC_MAX_IF_NAME];
|
||
|
};
|
||
|
|
||
|
struct link;
|
||
|
|
||
|
extern struct bearer *bearers;
|
||
|
|
||
|
void media_addr_printf(struct print_buf *pb, struct tipc_media_addr *a);
|
||
|
struct sk_buff *media_get_names(void);
|
||
|
|
||
|
struct sk_buff *bearer_get_names(void);
|
||
|
void bearer_add_dest(struct bearer *b_ptr, u32 dest);
|
||
|
void bearer_remove_dest(struct bearer *b_ptr, u32 dest);
|
||
|
void bearer_schedule(struct bearer *b_ptr, struct link *l_ptr);
|
||
|
struct bearer *bearer_find_interface(const char *if_name);
|
||
|
int bearer_resolve_congestion(struct bearer *b_ptr, struct link *l_ptr);
|
||
|
int bearer_init(void);
|
||
|
void bearer_stop(void);
|
||
|
int bearer_broadcast(struct sk_buff *buf, struct tipc_bearer *b_ptr,
|
||
|
struct tipc_media_addr *dest);
|
||
|
void bearer_lock_push(struct bearer *b_ptr);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* bearer_send- sends buffer to destination over bearer
|
||
|
*
|
||
|
* Returns true (1) if successful, or false (0) if unable to send
|
||
|
*
|
||
|
* IMPORTANT:
|
||
|
* The media send routine must not alter the buffer being passed in
|
||
|
* as it may be needed for later retransmission!
|
||
|
*
|
||
|
* If the media send routine returns a non-zero value (indicating that
|
||
|
* it was unable to send the buffer), it must:
|
||
|
* 1) mark the bearer as blocked,
|
||
|
* 2) call tipc_continue() once the bearer is able to send again.
|
||
|
* Media types that are unable to meet these two critera must ensure their
|
||
|
* send routine always returns success -- even if the buffer was not sent --
|
||
|
* and let TIPC's link code deal with the undelivered message.
|
||
|
*/
|
||
|
|
||
|
static inline int bearer_send(struct bearer *b_ptr, struct sk_buff *buf,
|
||
|
struct tipc_media_addr *dest)
|
||
|
{
|
||
|
return !b_ptr->media->send_msg(buf, &b_ptr->publ, dest);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* bearer_congested - determines if bearer is currently congested
|
||
|
*/
|
||
|
|
||
|
static inline int bearer_congested(struct bearer *b_ptr, struct link *l_ptr)
|
||
|
{
|
||
|
if (unlikely(b_ptr->publ.blocked))
|
||
|
return 1;
|
||
|
if (likely(list_empty(&b_ptr->cong_links)))
|
||
|
return 0;
|
||
|
return !bearer_resolve_congestion(b_ptr, l_ptr);
|
||
|
}
|
||
|
|
||
|
#endif
|