forked from Minki/linux
f905730c7e
Migrates the buf_seqno() helper routine from broadcast link level to unicast link level so that it can be used both types of TIPC links. This is a cosmetic change only, and does not affect the operation of TIPC. Signed-off-by: Allan Stephens <allan.stephens@windriver.com> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
327 lines
11 KiB
C
327 lines
11 KiB
C
/*
|
|
* net/tipc/link.h: Include file for TIPC link code
|
|
*
|
|
* Copyright (c) 1995-2006, Ericsson AB
|
|
* Copyright (c) 2004-2005, 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_LINK_H
|
|
#define _TIPC_LINK_H
|
|
|
|
#include "log.h"
|
|
#include "msg.h"
|
|
#include "node.h"
|
|
|
|
#define PUSH_FAILED 1
|
|
#define PUSH_FINISHED 2
|
|
|
|
/*
|
|
* Out-of-range value for link sequence numbers
|
|
*/
|
|
|
|
#define INVALID_LINK_SEQ 0x10000
|
|
|
|
/*
|
|
* Link states
|
|
*/
|
|
|
|
#define WORKING_WORKING 560810u
|
|
#define WORKING_UNKNOWN 560811u
|
|
#define RESET_UNKNOWN 560812u
|
|
#define RESET_RESET 560813u
|
|
|
|
/*
|
|
* Starting value for maximum packet size negotiation on unicast links
|
|
* (unless bearer MTU is less)
|
|
*/
|
|
|
|
#define MAX_PKT_DEFAULT 1500
|
|
|
|
/**
|
|
* struct link - TIPC link data structure
|
|
* @addr: network address of link's peer node
|
|
* @name: link name character string
|
|
* @media_addr: media address to use when sending messages over link
|
|
* @timer: link timer
|
|
* @owner: pointer to peer node
|
|
* @link_list: adjacent links in bearer's list of links
|
|
* @started: indicates if link has been started
|
|
* @checkpoint: reference point for triggering link continuity checking
|
|
* @peer_session: link session # being used by peer end of link
|
|
* @peer_bearer_id: bearer id used by link's peer endpoint
|
|
* @b_ptr: pointer to bearer used by link
|
|
* @tolerance: minimum link continuity loss needed to reset link [in ms]
|
|
* @continuity_interval: link continuity testing interval [in ms]
|
|
* @abort_limit: # of unacknowledged continuity probes needed to reset link
|
|
* @state: current state of link FSM
|
|
* @blocked: indicates if link has been administratively blocked
|
|
* @fsm_msg_cnt: # of protocol messages link FSM has sent in current state
|
|
* @proto_msg: template for control messages generated by link
|
|
* @pmsg: convenience pointer to "proto_msg" field
|
|
* @priority: current link priority
|
|
* @queue_limit: outbound message queue congestion thresholds (indexed by user)
|
|
* @exp_msg_count: # of tunnelled messages expected during link changeover
|
|
* @reset_checkpoint: seq # of last acknowledged message at time of link reset
|
|
* @max_pkt: current maximum packet size for this link
|
|
* @max_pkt_target: desired maximum packet size for this link
|
|
* @max_pkt_probes: # of probes based on current (max_pkt, max_pkt_target)
|
|
* @out_queue_size: # of messages in outbound message queue
|
|
* @first_out: ptr to first outbound message in queue
|
|
* @last_out: ptr to last outbound message in queue
|
|
* @next_out_no: next sequence number to use for outbound messages
|
|
* @last_retransmitted: sequence number of most recently retransmitted message
|
|
* @stale_count: # of identical retransmit requests made by peer
|
|
* @next_in_no: next sequence number to expect for inbound messages
|
|
* @deferred_inqueue_sz: # of messages in inbound message queue
|
|
* @oldest_deferred_in: ptr to first inbound message in queue
|
|
* @newest_deferred_in: ptr to last inbound message in queue
|
|
* @unacked_window: # of inbound messages rx'd without ack'ing back to peer
|
|
* @proto_msg_queue: ptr to (single) outbound control message
|
|
* @retransm_queue_size: number of messages to retransmit
|
|
* @retransm_queue_head: sequence number of first message to retransmit
|
|
* @next_out: ptr to first unsent outbound message in queue
|
|
* @waiting_ports: linked list of ports waiting for link congestion to abate
|
|
* @long_msg_seq_no: next identifier to use for outbound fragmented messages
|
|
* @defragm_buf: list of partially reassembled inbound message fragments
|
|
* @stats: collects statistics regarding link activity
|
|
*/
|
|
|
|
struct link {
|
|
u32 addr;
|
|
char name[TIPC_MAX_LINK_NAME];
|
|
struct tipc_media_addr media_addr;
|
|
struct timer_list timer;
|
|
struct tipc_node *owner;
|
|
struct list_head link_list;
|
|
|
|
/* Management and link supervision data */
|
|
int started;
|
|
u32 checkpoint;
|
|
u32 peer_session;
|
|
u32 peer_bearer_id;
|
|
struct tipc_bearer *b_ptr;
|
|
u32 tolerance;
|
|
u32 continuity_interval;
|
|
u32 abort_limit;
|
|
int state;
|
|
int blocked;
|
|
u32 fsm_msg_cnt;
|
|
struct {
|
|
unchar hdr[INT_H_SIZE];
|
|
unchar body[TIPC_MAX_IF_NAME];
|
|
} proto_msg;
|
|
struct tipc_msg *pmsg;
|
|
u32 priority;
|
|
u32 queue_limit[15]; /* queue_limit[0]==window limit */
|
|
|
|
/* Changeover */
|
|
u32 exp_msg_count;
|
|
u32 reset_checkpoint;
|
|
|
|
/* Max packet negotiation */
|
|
u32 max_pkt;
|
|
u32 max_pkt_target;
|
|
u32 max_pkt_probes;
|
|
|
|
/* Sending */
|
|
u32 out_queue_size;
|
|
struct sk_buff *first_out;
|
|
struct sk_buff *last_out;
|
|
u32 next_out_no;
|
|
u32 last_retransmitted;
|
|
u32 stale_count;
|
|
|
|
/* Reception */
|
|
u32 next_in_no;
|
|
u32 deferred_inqueue_sz;
|
|
struct sk_buff *oldest_deferred_in;
|
|
struct sk_buff *newest_deferred_in;
|
|
u32 unacked_window;
|
|
|
|
/* Congestion handling */
|
|
struct sk_buff *proto_msg_queue;
|
|
u32 retransm_queue_size;
|
|
u32 retransm_queue_head;
|
|
struct sk_buff *next_out;
|
|
struct list_head waiting_ports;
|
|
|
|
/* Fragmentation/defragmentation */
|
|
u32 long_msg_seq_no;
|
|
struct sk_buff *defragm_buf;
|
|
|
|
/* Statistics */
|
|
struct {
|
|
u32 sent_info; /* used in counting # sent packets */
|
|
u32 recv_info; /* used in counting # recv'd packets */
|
|
u32 sent_states;
|
|
u32 recv_states;
|
|
u32 sent_probes;
|
|
u32 recv_probes;
|
|
u32 sent_nacks;
|
|
u32 recv_nacks;
|
|
u32 sent_acks;
|
|
u32 sent_bundled;
|
|
u32 sent_bundles;
|
|
u32 recv_bundled;
|
|
u32 recv_bundles;
|
|
u32 retransmitted;
|
|
u32 sent_fragmented;
|
|
u32 sent_fragments;
|
|
u32 recv_fragmented;
|
|
u32 recv_fragments;
|
|
u32 link_congs; /* # port sends blocked by congestion */
|
|
u32 bearer_congs;
|
|
u32 deferred_recv;
|
|
u32 duplicates;
|
|
u32 max_queue_sz; /* send queue size high water mark */
|
|
u32 accu_queue_sz; /* used for send queue size profiling */
|
|
u32 queue_sz_counts; /* used for send queue size profiling */
|
|
u32 msg_length_counts; /* used for message length profiling */
|
|
u32 msg_lengths_total; /* used for message length profiling */
|
|
u32 msg_length_profile[7]; /* used for msg. length profiling */
|
|
} stats;
|
|
};
|
|
|
|
struct tipc_port;
|
|
|
|
struct link *tipc_link_create(struct tipc_node *n_ptr,
|
|
struct tipc_bearer *b_ptr,
|
|
const struct tipc_media_addr *media_addr);
|
|
void tipc_link_delete(struct link *l_ptr);
|
|
void tipc_link_changeover(struct link *l_ptr);
|
|
void tipc_link_send_duplicate(struct link *l_ptr, struct link *dest);
|
|
void tipc_link_reset_fragments(struct link *l_ptr);
|
|
int tipc_link_is_up(struct link *l_ptr);
|
|
int tipc_link_is_active(struct link *l_ptr);
|
|
u32 tipc_link_push_packet(struct link *l_ptr);
|
|
void tipc_link_stop(struct link *l_ptr);
|
|
struct sk_buff *tipc_link_cmd_config(const void *req_tlv_area, int req_tlv_space, u16 cmd);
|
|
struct sk_buff *tipc_link_cmd_show_stats(const void *req_tlv_area, int req_tlv_space);
|
|
struct sk_buff *tipc_link_cmd_reset_stats(const void *req_tlv_area, int req_tlv_space);
|
|
void tipc_link_reset(struct link *l_ptr);
|
|
int tipc_link_send(struct sk_buff *buf, u32 dest, u32 selector);
|
|
void tipc_link_send_names(struct list_head *message_list, u32 dest);
|
|
int tipc_link_send_buf(struct link *l_ptr, struct sk_buff *buf);
|
|
u32 tipc_link_get_max_pkt(u32 dest, u32 selector);
|
|
int tipc_link_send_sections_fast(struct tipc_port *sender,
|
|
struct iovec const *msg_sect,
|
|
const u32 num_sect,
|
|
unsigned int total_len,
|
|
u32 destnode);
|
|
void tipc_link_recv_bundle(struct sk_buff *buf);
|
|
int tipc_link_recv_fragment(struct sk_buff **pending,
|
|
struct sk_buff **fb,
|
|
struct tipc_msg **msg);
|
|
void tipc_link_send_proto_msg(struct link *l_ptr, u32 msg_typ, int prob, u32 gap,
|
|
u32 tolerance, u32 priority, u32 acked_mtu);
|
|
void tipc_link_push_queue(struct link *l_ptr);
|
|
u32 tipc_link_defer_pkt(struct sk_buff **head, struct sk_buff **tail,
|
|
struct sk_buff *buf);
|
|
void tipc_link_wakeup_ports(struct link *l_ptr, int all);
|
|
void tipc_link_set_queue_limits(struct link *l_ptr, u32 window);
|
|
void tipc_link_retransmit(struct link *l_ptr, struct sk_buff *start, u32 retransmits);
|
|
|
|
/*
|
|
* Link sequence number manipulation routines (uses modulo 2**16 arithmetic)
|
|
*/
|
|
|
|
static inline u32 buf_seqno(struct sk_buff *buf)
|
|
{
|
|
return msg_seqno(buf_msg(buf));
|
|
}
|
|
|
|
static inline u32 mod(u32 x)
|
|
{
|
|
return x & 0xffffu;
|
|
}
|
|
|
|
static inline int between(u32 lower, u32 upper, u32 n)
|
|
{
|
|
if ((lower < n) && (n < upper))
|
|
return 1;
|
|
if ((upper < lower) && ((n > lower) || (n < upper)))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static inline int less_eq(u32 left, u32 right)
|
|
{
|
|
return mod(right - left) < 32768u;
|
|
}
|
|
|
|
static inline int less(u32 left, u32 right)
|
|
{
|
|
return less_eq(left, right) && (mod(right) != mod(left));
|
|
}
|
|
|
|
static inline u32 lesser(u32 left, u32 right)
|
|
{
|
|
return less_eq(left, right) ? left : right;
|
|
}
|
|
|
|
|
|
/*
|
|
* Link status checking routines
|
|
*/
|
|
|
|
static inline int link_working_working(struct link *l_ptr)
|
|
{
|
|
return l_ptr->state == WORKING_WORKING;
|
|
}
|
|
|
|
static inline int link_working_unknown(struct link *l_ptr)
|
|
{
|
|
return l_ptr->state == WORKING_UNKNOWN;
|
|
}
|
|
|
|
static inline int link_reset_unknown(struct link *l_ptr)
|
|
{
|
|
return l_ptr->state == RESET_UNKNOWN;
|
|
}
|
|
|
|
static inline int link_reset_reset(struct link *l_ptr)
|
|
{
|
|
return l_ptr->state == RESET_RESET;
|
|
}
|
|
|
|
static inline int link_blocked(struct link *l_ptr)
|
|
{
|
|
return l_ptr->exp_msg_count || l_ptr->blocked;
|
|
}
|
|
|
|
static inline int link_congested(struct link *l_ptr)
|
|
{
|
|
return l_ptr->out_queue_size >= l_ptr->queue_limit[0];
|
|
}
|
|
|
|
#endif
|