[mirror_ubuntu-artful-kernel.git] / net / tipc / link.h

/*
 * net/tipc/link.h: Include file for TIPC link code
 *
 * Copyright (c) 1995-2006, 2013-2014, 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 <net/genetlink.h>
#include "msg.h"
#include "node.h"

/* TIPC-specific error codes
*/
#define ELINKCONG EAGAIN	/* link congestion <=> resource unavailable */

/* Out-of-range value for link sequence numbers
 */
#define INVALID_LINK_SEQ 0x10000

/* Link working states
 */
#define WORKING_WORKING 560810u
#define WORKING_UNKNOWN 560811u
#define RESET_UNKNOWN   560812u
#define RESET_RESET     560813u

/* Link endpoint execution states
 */
#define LINK_STARTED    0x0001
#define LINK_STOPPED    0x0002

/* Starting value for maximum packet size negotiation on unicast links
 * (unless bearer MTU is less)
 */
#define MAX_PKT_DEFAULT 1500

struct tipc_stats {
	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 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 */
};

/**
 * struct tipc_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
 * @refcnt: reference counter for permanent references (owner node & timer)
 * @flags: execution state flags for link endpoint instance
 * @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
 * @bearer_id: local bearer id used by link
 * @tolerance: minimum link continuity loss needed to reset link [in ms]
 * @cont_intv: link continuity testing interval
 * @abort_limit: # of unacknowledged continuity probes needed to reset link
 * @state: current state of link FSM
 * @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
 * @net_plane: current link network plane ('A' through 'H')
 * @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)
 * @outqueue: outbound message 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_queue: deferred queue saved OOS b'cast message received from node
 * @unacked_window: # of inbound messages rx'd without ack'ing back to peer
 * @next_out: ptr to first unsent outbound message in queue
 * @waiting_sks: linked list of sockets waiting for link congestion to abate
 * @long_msg_seq_no: next identifier to use for outbound fragmented messages
 * @reasm_buf: head of partially reassembled inbound message fragments
 * @stats: collects statistics regarding link activity
 */
struct tipc_link {
	u32 addr;
	char name[TIPC_MAX_LINK_NAME];
	struct tipc_media_addr media_addr;
	struct timer_list timer;
	struct tipc_node *owner;
	struct kref ref;

	/* Management and link supervision data */
	unsigned int flags;
	u32 checkpoint;
	u32 peer_session;
	u32 peer_bearer_id;
	u32 bearer_id;
	u32 tolerance;
	unsigned long cont_intv;
	u32 abort_limit;
	int state;
	u32 fsm_msg_cnt;
	struct {
		unchar hdr[INT_H_SIZE];
		unchar body[TIPC_MAX_IF_NAME];
	} proto_msg;
	struct tipc_msg *pmsg;
	u32 priority;
	char net_plane;
	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 */
	struct sk_buff_head outqueue;
	u32 next_out_no;
	u32 last_retransmitted;
	u32 stale_count;

	/* Reception */
	u32 next_in_no;
	struct sk_buff_head deferred_queue;
	u32 unacked_window;

	/* Congestion handling */
	struct sk_buff *next_out;
	struct sk_buff_head waiting_sks;

	/* Fragmentation/reassembly */
	u32 long_msg_seq_no;
	struct sk_buff *reasm_buf;

	/* Statistics */
	struct tipc_stats stats;
};

struct tipc_port;

struct tipc_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 tipc_link *link);
void tipc_link_delete_list(struct net *net, unsigned int bearer_id,
			   bool shutting_down);
void tipc_link_failover_send_queue(struct tipc_link *l_ptr);
void tipc_link_dup_queue_xmit(struct tipc_link *l_ptr, struct tipc_link *dest);
void tipc_link_reset_fragments(struct tipc_link *l_ptr);
int tipc_link_is_up(struct tipc_link *l_ptr);
int tipc_link_is_active(struct tipc_link *l_ptr);
void tipc_link_purge_queues(struct tipc_link *l_ptr);
struct sk_buff *tipc_link_cmd_config(struct net *net, const void *req_tlv_area,
				     int req_tlv_space, u16 cmd);
struct sk_buff *tipc_link_cmd_show_stats(struct net *net,
					 const void *req_tlv_area,
					 int req_tlv_space);
struct sk_buff *tipc_link_cmd_reset_stats(struct net *net,
					  const void *req_tlv_area,
					  int req_tlv_space);
void tipc_link_reset_all(struct tipc_node *node);
void tipc_link_reset(struct tipc_link *l_ptr);
void tipc_link_reset_list(struct net *net, unsigned int bearer_id);
int tipc_link_xmit_skb(struct net *net, struct sk_buff *skb, u32 dest,
		       u32 selector);
int tipc_link_xmit(struct net *net, struct sk_buff_head *list, u32 dest,
		   u32 selector);
int __tipc_link_xmit(struct net *net, struct tipc_link *link,
		     struct sk_buff_head *list);
void tipc_link_bundle_rcv(struct net *net, struct sk_buff *buf);
void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int prob,
			  u32 gap, u32 tolerance, u32 priority, u32 acked_mtu);
void tipc_link_push_packets(struct tipc_link *l_ptr);
u32 tipc_link_defer_pkt(struct sk_buff_head *list, struct sk_buff *buf);
void tipc_link_set_queue_limits(struct tipc_link *l_ptr, u32 window);
void tipc_link_retransmit(struct tipc_link *l_ptr,
			  struct sk_buff *start, u32 retransmits);
struct sk_buff *tipc_skb_queue_next(const struct sk_buff_head *list,
				    const struct sk_buff *skb);

int tipc_nl_link_dump(struct sk_buff *skb, struct netlink_callback *cb);
int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info);
int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info);
int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info);
int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]);

/*
 * 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 less_eq(u32 left, u32 right)
{
	return mod(right - left) < 32768u;
}

static inline int more(u32 left, u32 right)
{
	return !less_eq(left, right);
}

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 tipc_link *l_ptr)
{
	return l_ptr->state == WORKING_WORKING;
}

static inline int link_working_unknown(struct tipc_link *l_ptr)
{
	return l_ptr->state == WORKING_UNKNOWN;
}

static inline int link_reset_unknown(struct tipc_link *l_ptr)
{
	return l_ptr->state == RESET_UNKNOWN;
}

static inline int link_reset_reset(struct tipc_link *l_ptr)
{
	return l_ptr->state == RESET_RESET;
}

static inline int link_congested(struct tipc_link *l_ptr)
{
	return skb_queue_len(&l_ptr->outqueue) >= l_ptr->queue_limit[0];
}

#endif
Commit	Line	Data
b97bf3fd PL	1	/*
b97bf3fd PL	2	* net/tipc/link.h: Include file for TIPC link code
c4307285	3	*
50100a5e	4	* Copyright (c) 1995-2006, 2013-2014, Ericsson AB
23dd4cce	5	* Copyright (c) 2004-2005, 2010-2011, Wind River Systems
b97bf3fd PL	6	* All rights reserved.
b97bf3fd PL	7	*
9ea1fd3c	8	* Redistribution and use in source and binary forms, with or without
b97bf3fd PL	9	* modification, are permitted provided that the following conditions are met:
b97bf3fd PL	10	*
9ea1fd3c PL	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
	16	* 3. Neither the names of the copyright holders nor the names of its
	17	* contributors may be used to endorse or promote products derived from
	18	* this software without specific prior written permission.
b97bf3fd	19	*
9ea1fd3c PL	20	* Alternatively, this software may be distributed under the terms of the
	21	* GNU General Public License ("GPL") version 2 as published by the Free
	22	* Software Foundation.
	23	*
	24	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	25	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	26	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	27	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
	28	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	29	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	30	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	31	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	32	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	33	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
b97bf3fd PL	34	* POSSIBILITY OF SUCH DAMAGE.
	35	*/
	36
	37	#ifndef _TIPC_LINK_H
	38	#define _TIPC_LINK_H
	39
0655f6a8	40	#include <net/genetlink.h>
b97bf3fd	41	#include "msg.h"
b97bf3fd PL	42	#include "node.h"
b97bf3fd PL	43
859fc7c0 YX	44	/* TIPC-specific error codes
	45	*/
	46	#define ELINKCONG EAGAIN /* link congestion <=> resource unavailable */
	47
135daee6	48	/* Out-of-range value for link sequence numbers
36559591	49	*/
36559591 AS	50	#define INVALID_LINK_SEQ 0x10000
36559591 AS	51
135daee6	52	/* Link working states
b97bf3fd	53	*/
b97bf3fd PL	54	#define WORKING_WORKING 560810u
	55	#define WORKING_UNKNOWN 560811u
	56	#define RESET_UNKNOWN 560812u
	57	#define RESET_RESET 560813u
	58
135daee6 YX	59	/* Link endpoint execution states
	60	*/
	61	#define LINK_STARTED 0x0001
c61dd61d	62	#define LINK_STOPPED 0x0002
135daee6 YX	63
135daee6 YX	64	/* Starting value for maximum packet size negotiation on unicast links
b97bf3fd PL	65	* (unless bearer MTU is less)
b97bf3fd PL	66	*/
b97bf3fd PL	67	#define MAX_PKT_DEFAULT 1500
b97bf3fd PL	68
7e9cab58 PG	69	struct tipc_stats {
	70	u32 sent_info; /* used in counting # sent packets */
	71	u32 recv_info; /* used in counting # recv'd packets */
	72	u32 sent_states;
	73	u32 recv_states;
	74	u32 sent_probes;
	75	u32 recv_probes;
	76	u32 sent_nacks;
	77	u32 recv_nacks;
	78	u32 sent_acks;
	79	u32 sent_bundled;
	80	u32 sent_bundles;
	81	u32 recv_bundled;
	82	u32 recv_bundles;
	83	u32 retransmitted;
	84	u32 sent_fragmented;
	85	u32 sent_fragments;
	86	u32 recv_fragmented;
	87	u32 recv_fragments;
	88	u32 link_congs; /* # port sends blocked by congestion */
7e9cab58 PG	89	u32 deferred_recv;
	90	u32 duplicates;
	91	u32 max_queue_sz; /* send queue size high water mark */
	92	u32 accu_queue_sz; /* used for send queue size profiling */
	93	u32 queue_sz_counts; /* used for send queue size profiling */
	94	u32 msg_length_counts; /* used for message length profiling */
	95	u32 msg_lengths_total; /* used for message length profiling */
	96	u32 msg_length_profile[7]; /* used for msg. length profiling */
	97	};
	98
b97bf3fd	99	/**
a18c4bc3	100	* struct tipc_link - TIPC link data structure
b97bf3fd PL	101	* @addr: network address of link's peer node
	102	* @name: link name character string
	103	* @media_addr: media address to use when sending messages over link
	104	* @timer: link timer
	105	* @owner: pointer to peer node
2d72d495	106	* @refcnt: reference counter for permanent references (owner node & timer)
135daee6	107	* @flags: execution state flags for link endpoint instance
b97bf3fd PL	108	* @checkpoint: reference point for triggering link continuity checking
	109	* @peer_session: link session # being used by peer end of link
	110	* @peer_bearer_id: bearer id used by link's peer endpoint
7a2f7d18	111	* @bearer_id: local bearer id used by link
c4307285	112	* @tolerance: minimum link continuity loss needed to reset link [in ms]
2f55c437	113	* @cont_intv: link continuity testing interval
b97bf3fd PL	114	* @abort_limit: # of unacknowledged continuity probes needed to reset link
b97bf3fd PL	115	* @state: current state of link FSM
b97bf3fd PL	116	* @fsm_msg_cnt: # of protocol messages link FSM has sent in current state
	117	* @proto_msg: template for control messages generated by link
	118	* @pmsg: convenience pointer to "proto_msg" field
	119	* @priority: current link priority
7a2f7d18	120	* @net_plane: current link network plane ('A' through 'H')
b97bf3fd PL	121	* @queue_limit: outbound message queue congestion thresholds (indexed by user)
	122	* @exp_msg_count: # of tunnelled messages expected during link changeover
	123	* @reset_checkpoint: seq # of last acknowledged message at time of link reset
	124	* @max_pkt: current maximum packet size for this link
	125	* @max_pkt_target: desired maximum packet size for this link
	126	* @max_pkt_probes: # of probes based on current (max_pkt, max_pkt_target)
58dc55f2	127	* @outqueue: outbound message queue
b97bf3fd PL	128	* @next_out_no: next sequence number to use for outbound messages
	129	* @last_retransmitted: sequence number of most recently retransmitted message
	130	* @stale_count: # of identical retransmit requests made by peer
	131	* @next_in_no: next sequence number to expect for inbound messages
bc6fecd4	132	* @deferred_queue: deferred queue saved OOS b'cast message received from node
b97bf3fd	133	* @unacked_window: # of inbound messages rx'd without ack'ing back to peer
b97bf3fd	134	* @next_out: ptr to first unsent outbound message in queue
50100a5e	135	* @waiting_sks: linked list of sockets waiting for link congestion to abate
b97bf3fd	136	* @long_msg_seq_no: next identifier to use for outbound fragmented messages
37e22164	137	* @reasm_buf: head of partially reassembled inbound message fragments
b97bf3fd	138	* @stats: collects statistics regarding link activity
b97bf3fd	139	*/
a18c4bc3	140	struct tipc_link {
b97bf3fd PL	141	u32 addr;
	142	char name[TIPC_MAX_LINK_NAME];
	143	struct tipc_media_addr media_addr;
	144	struct timer_list timer;
6c00055a	145	struct tipc_node *owner;
2d72d495	146	struct kref ref;
b97bf3fd PL	147
b97bf3fd PL	148	/* Management and link supervision data */
135daee6	149	unsigned int flags;
b97bf3fd PL	150	u32 checkpoint;
	151	u32 peer_session;
	152	u32 peer_bearer_id;
7a2f7d18	153	u32 bearer_id;
b97bf3fd	154	u32 tolerance;
2f55c437	155	unsigned long cont_intv;
b97bf3fd PL	156	u32 abort_limit;
b97bf3fd PL	157	int state;
b97bf3fd PL	158	u32 fsm_msg_cnt;
	159	struct {
	160	unchar hdr[INT_H_SIZE];
	161	unchar body[TIPC_MAX_IF_NAME];
	162	} proto_msg;
	163	struct tipc_msg *pmsg;
	164	u32 priority;
7a2f7d18	165	char net_plane;
b97bf3fd PL	166	u32 queue_limit[15]; /* queue_limit[0]==window limit */
	167
	168	/* Changeover */
	169	u32 exp_msg_count;
	170	u32 reset_checkpoint;
	171
c4307285 YH	172	/* Max packet negotiation */
	173	u32 max_pkt;
	174	u32 max_pkt_target;
	175	u32 max_pkt_probes;
b97bf3fd PL	176
b97bf3fd PL	177	/* Sending */
58dc55f2	178	struct sk_buff_head outqueue;
b97bf3fd	179	u32 next_out_no;
c4307285 YH	180	u32 last_retransmitted;
c4307285 YH	181	u32 stale_count;
b97bf3fd PL	182
	183	/* Reception */
	184	u32 next_in_no;
bc6fecd4	185	struct sk_buff_head deferred_queue;
b97bf3fd PL	186	u32 unacked_window;
	187
	188	/* Congestion handling */
b97bf3fd	189	struct sk_buff *next_out;
50100a5e	190	struct sk_buff_head waiting_sks;
b97bf3fd	191
40ba3cdf	192	/* Fragmentation/reassembly */
b97bf3fd	193	u32 long_msg_seq_no;
37e22164	194	struct sk_buff *reasm_buf;
b97bf3fd	195
c4307285	196	/* Statistics */
7e9cab58	197	struct tipc_stats stats;
b97bf3fd PL	198	};
b97bf3fd PL	199
23dd4cce	200	struct tipc_port;
b97bf3fd	201
a18c4bc3	202	struct tipc_link tipc_link_create(struct tipc_node n_ptr,
37b9c08a	203	struct tipc_bearer *b_ptr,
4323add6	204	const struct tipc_media_addr *media_addr);
7d24dcdb	205	void tipc_link_delete(struct tipc_link *link);
f2f9800d YX	206	void tipc_link_delete_list(struct net *net, unsigned int bearer_id,
f2f9800d YX	207	bool shutting_down);
170b3927	208	void tipc_link_failover_send_queue(struct tipc_link *l_ptr);
247f0f3c	209	void tipc_link_dup_queue_xmit(struct tipc_link l_ptr, struct tipc_link dest);
a18c4bc3 PG	210	void tipc_link_reset_fragments(struct tipc_link *l_ptr);
	211	int tipc_link_is_up(struct tipc_link *l_ptr);
	212	int tipc_link_is_active(struct tipc_link *l_ptr);
581465fa	213	void tipc_link_purge_queues(struct tipc_link *l_ptr);
f2f9800d YX	214	struct sk_buff tipc_link_cmd_config(struct net net, const void *req_tlv_area,
	215	int req_tlv_space, u16 cmd);
	216	struct sk_buff tipc_link_cmd_show_stats(struct net net,
	217	const void *req_tlv_area,
170b3927	218	int req_tlv_space);
f2f9800d YX	219	struct sk_buff tipc_link_cmd_reset_stats(struct net net,
f2f9800d YX	220	const void *req_tlv_area,
170b3927	221	int req_tlv_space);
3f5a12bd	222	void tipc_link_reset_all(struct tipc_node *node);
a18c4bc3	223	void tipc_link_reset(struct tipc_link *l_ptr);
f2f9800d YX	224	void tipc_link_reset_list(struct net *net, unsigned int bearer_id);
	225	int tipc_link_xmit_skb(struct net net, struct sk_buff skb, u32 dest,
	226	u32 selector);
	227	int tipc_link_xmit(struct net net, struct sk_buff_head list, u32 dest,
	228	u32 selector);
7f9f95d9 YX	229	int __tipc_link_xmit(struct net net, struct tipc_link link,
7f9f95d9 YX	230	struct sk_buff_head *list);
f2f9800d	231	void tipc_link_bundle_rcv(struct net net, struct sk_buff buf);
247f0f3c YX	232	void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int prob,
247f0f3c YX	233	u32 gap, u32 tolerance, u32 priority, u32 acked_mtu);
47b4c9a8	234	void tipc_link_push_packets(struct tipc_link *l_ptr);
bc6fecd4	235	u32 tipc_link_defer_pkt(struct sk_buff_head list, struct sk_buff buf);
a18c4bc3 PG	236	void tipc_link_set_queue_limits(struct tipc_link *l_ptr, u32 window);
	237	void tipc_link_retransmit(struct tipc_link *l_ptr,
	238	struct sk_buff *start, u32 retransmits);
58dc55f2 YX	239	struct sk_buff tipc_skb_queue_next(const struct sk_buff_head list,
58dc55f2 YX	240	const struct sk_buff *skb);
b97bf3fd	241
7be57fc6 RA	242	int tipc_nl_link_dump(struct sk_buff skb, struct netlink_callback cb);
7be57fc6 RA	243	int tipc_nl_link_get(struct sk_buff skb, struct genl_info info);
f96ce7a2	244	int tipc_nl_link_set(struct sk_buff skb, struct genl_info info);
ae36342b	245	int tipc_nl_link_reset_stats(struct sk_buff skb, struct genl_info info);
0655f6a8 RA	246	int tipc_nl_parse_link_prop(struct nlattr prop, struct nlattr props[]);
0655f6a8 RA	247
b97bf3fd PL	248	/*
	249	* Link sequence number manipulation routines (uses modulo 2**16 arithmetic)
	250	*/
f905730c AS	251	static inline u32 buf_seqno(struct sk_buff *buf)
	252	{
	253	return msg_seqno(buf_msg(buf));
	254	}
	255
b97bf3fd PL	256	static inline u32 mod(u32 x)
	257	{
	258	return x & 0xffffu;
	259	}
	260
b97bf3fd PL	261	static inline int less_eq(u32 left, u32 right)
b97bf3fd PL	262	{
a02cec21	263	return mod(right - left) < 32768u;
b97bf3fd PL	264	}
b97bf3fd PL	265
58dc55f2 YX	266	static inline int more(u32 left, u32 right)
	267	{
	268	return !less_eq(left, right);
	269	}
	270
b97bf3fd PL	271	static inline int less(u32 left, u32 right)
b97bf3fd PL	272	{
a02cec21	273	return less_eq(left, right) && (mod(right) != mod(left));
b97bf3fd PL	274	}
	275
	276	static inline u32 lesser(u32 left, u32 right)
	277	{
	278	return less_eq(left, right) ? left : right;
	279	}
	280
01fee256 AS	281
	282	/*
	283	* Link status checking routines
	284	*/
a18c4bc3	285	static inline int link_working_working(struct tipc_link *l_ptr)
01fee256	286	{
a02cec21	287	return l_ptr->state == WORKING_WORKING;
01fee256 AS	288	}
01fee256 AS	289
a18c4bc3	290	static inline int link_working_unknown(struct tipc_link *l_ptr)
01fee256	291	{
a02cec21	292	return l_ptr->state == WORKING_UNKNOWN;
01fee256 AS	293	}
01fee256 AS	294
a18c4bc3	295	static inline int link_reset_unknown(struct tipc_link *l_ptr)
01fee256	296	{
a02cec21	297	return l_ptr->state == RESET_UNKNOWN;
01fee256 AS	298	}
01fee256 AS	299
a18c4bc3	300	static inline int link_reset_reset(struct tipc_link *l_ptr)
01fee256	301	{
a02cec21	302	return l_ptr->state == RESET_RESET;
01fee256 AS	303	}
01fee256 AS	304
a18c4bc3	305	static inline int link_congested(struct tipc_link *l_ptr)
01fee256	306	{
58dc55f2	307	return skb_queue_len(&l_ptr->outqueue) >= l_ptr->queue_limit[0];
01fee256 AS	308	}
01fee256 AS	309
b97bf3fd	310	#endif