173 lines
6.2 KiB
C
173 lines
6.2 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, 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 "core.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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* 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 [defined in tipc_bearer.h]
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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 bearer - TIPC bearer information available to internal users
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* @publ: bearer information available to privileged users
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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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struct bearer {
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struct tipc_bearer publ;
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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 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 bearer *bearers;
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void media_addr_printf(struct print_buf *pb, struct tipc_media_addr *a);
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struct sk_buff *media_get_names(void);
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struct sk_buff *bearer_get_names(void);
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void bearer_add_dest(struct bearer *b_ptr, u32 dest);
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void bearer_remove_dest(struct bearer *b_ptr, u32 dest);
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void bearer_schedule(struct bearer *b_ptr, struct link *l_ptr);
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struct bearer *bearer_find_interface(const char *if_name);
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int bearer_resolve_congestion(struct bearer *b_ptr, struct link *l_ptr);
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int bearer_init(void);
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void bearer_stop(void);
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int bearer_broadcast(struct sk_buff *buf, struct tipc_bearer *b_ptr,
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struct tipc_media_addr *dest);
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void bearer_lock_push(struct bearer *b_ptr);
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/**
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* 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 bearer_send(struct bearer *b_ptr, 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->publ, dest);
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}
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/**
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* bearer_congested - determines if bearer is currently congested
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*/
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static inline int bearer_congested(struct bearer *b_ptr, struct link *l_ptr)
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{
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if (unlikely(b_ptr->publ.blocked))
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return 1;
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if (likely(list_empty(&b_ptr->cong_links)))
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return 0;
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return !bearer_resolve_congestion(b_ptr, l_ptr);
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}
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#endif
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