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

/*
 * 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 "msg.h"
#include "node.h"

/*
 * Link reassembly status codes
 */
#define LINK_REASM_ERROR	-1
#define LINK_REASM_COMPLETE	1

/*
 * 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 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
 * @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
 * @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
 * @reasm_head: list head of partially reassembled inbound message fragments
 * @reasm_tail: last fragment received
 * @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 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;
	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/reassembly */
	u32 long_msg_seq_no;
	struct sk_buff *reasm_head;
	struct sk_buff *reasm_tail;

	/* 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 *l_ptr);
void tipc_link_failover_send_queue(struct tipc_link *l_ptr);
void tipc_link_dup_send_queue(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_stop(struct tipc_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 tipc_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 tipc_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,
				 unsigned int len, u32 destnode);
void tipc_link_recv_bundle(struct sk_buff *buf);
int  tipc_link_recv_fragment(struct sk_buff **reasm_head,
			     struct sk_buff **reasm_tail,
			     struct sk_buff **fbuf);
void tipc_link_send_proto_msg(struct tipc_link *l_ptr, u32 msg_typ, int prob,
			      u32 gap, u32 tolerance, u32 priority,
			      u32 acked_mtu);
void tipc_link_push_queue(struct tipc_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 tipc_link *l_ptr, int all);
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);

/*
 * 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 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 l_ptr->out_queue_size >= l_ptr->queue_limit[0];
}

#endif
Commit	Line	Data
	1	/*
	2	* net/tipc/link.h: Include file for TIPC link code
	3	*
	4	* Copyright (c) 1995-2006, Ericsson AB
	5	* Copyright (c) 2004-2005, 2010-2011, Wind River Systems
	6	* All rights reserved.
	7	*
	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions are met:
	10	*
	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.
	19	*
	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
	34	* POSSIBILITY OF SUCH DAMAGE.
	35	*/
	36
	37	#ifndef _TIPC_LINK_H
	38	#define _TIPC_LINK_H
	39
	40	#include "msg.h"
	41	#include "node.h"
	42
	43	/*
	44	* Link reassembly status codes
	45	*/
	46	#define LINK_REASM_ERROR -1
	47	#define LINK_REASM_COMPLETE 1
	48
	49	/*
	50	* Out-of-range value for link sequence numbers
	51	*/
	52	#define INVALID_LINK_SEQ 0x10000
	53
	54	/*
	55	* Link states
	56	*/
	57	#define WORKING_WORKING 560810u
	58	#define WORKING_UNKNOWN 560811u
	59	#define RESET_UNKNOWN 560812u
	60	#define RESET_RESET 560813u
	61
	62	/*
	63	* Starting value for maximum packet size negotiation on unicast links
	64	* (unless bearer MTU is less)
	65	*/
	66	#define MAX_PKT_DEFAULT 1500
	67
	68	struct tipc_stats {
	69	u32 sent_info; /* used in counting # sent packets */
	70	u32 recv_info; /* used in counting # recv'd packets */
	71	u32 sent_states;
	72	u32 recv_states;
	73	u32 sent_probes;
	74	u32 recv_probes;
	75	u32 sent_nacks;
	76	u32 recv_nacks;
	77	u32 sent_acks;
	78	u32 sent_bundled;
	79	u32 sent_bundles;
	80	u32 recv_bundled;
	81	u32 recv_bundles;
	82	u32 retransmitted;
	83	u32 sent_fragmented;
	84	u32 sent_fragments;
	85	u32 recv_fragmented;
	86	u32 recv_fragments;
	87	u32 link_congs; /* # port sends blocked by congestion */
	88	u32 deferred_recv;
	89	u32 duplicates;
	90	u32 max_queue_sz; /* send queue size high water mark */
	91	u32 accu_queue_sz; /* used for send queue size profiling */
	92	u32 queue_sz_counts; /* used for send queue size profiling */
	93	u32 msg_length_counts; /* used for message length profiling */
	94	u32 msg_lengths_total; /* used for message length profiling */
	95	u32 msg_length_profile[7]; /* used for msg. length profiling */
	96	};
	97
	98	/**
	99	* struct tipc_link - TIPC link data structure
	100	* @addr: network address of link's peer node
	101	* @name: link name character string
	102	* @media_addr: media address to use when sending messages over link
	103	* @timer: link timer
	104	* @owner: pointer to peer node
	105	* @link_list: adjacent links in bearer's list of links
	106	* @started: indicates if link has been started
	107	* @checkpoint: reference point for triggering link continuity checking
	108	* @peer_session: link session # being used by peer end of link
	109	* @peer_bearer_id: bearer id used by link's peer endpoint
	110	* @b_ptr: pointer to bearer used by link
	111	* @tolerance: minimum link continuity loss needed to reset link [in ms]
	112	* @continuity_interval: link continuity testing interval [in ms]
	113	* @abort_limit: # of unacknowledged continuity probes needed to reset link
	114	* @state: current state of link FSM
	115	* @fsm_msg_cnt: # of protocol messages link FSM has sent in current state
	116	* @proto_msg: template for control messages generated by link
	117	* @pmsg: convenience pointer to "proto_msg" field
	118	* @priority: current link priority
	119	* @queue_limit: outbound message queue congestion thresholds (indexed by user)
	120	* @exp_msg_count: # of tunnelled messages expected during link changeover
	121	* @reset_checkpoint: seq # of last acknowledged message at time of link reset
	122	* @max_pkt: current maximum packet size for this link
	123	* @max_pkt_target: desired maximum packet size for this link
	124	* @max_pkt_probes: # of probes based on current (max_pkt, max_pkt_target)
	125	* @out_queue_size: # of messages in outbound message queue
	126	* @first_out: ptr to first outbound message in queue
	127	* @last_out: ptr to last outbound message in queue
	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
	132	* @deferred_inqueue_sz: # of messages in inbound message queue
	133	* @oldest_deferred_in: ptr to first inbound message in queue
	134	* @newest_deferred_in: ptr to last inbound message in queue
	135	* @unacked_window: # of inbound messages rx'd without ack'ing back to peer
	136	* @proto_msg_queue: ptr to (single) outbound control message
	137	* @retransm_queue_size: number of messages to retransmit
	138	* @retransm_queue_head: sequence number of first message to retransmit
	139	* @next_out: ptr to first unsent outbound message in queue
	140	* @waiting_ports: linked list of ports waiting for link congestion to abate
	141	* @long_msg_seq_no: next identifier to use for outbound fragmented messages
	142	* @reasm_head: list head of partially reassembled inbound message fragments
	143	* @reasm_tail: last fragment received
	144	* @stats: collects statistics regarding link activity
	145	*/
	146	struct tipc_link {
	147	u32 addr;
	148	char name[TIPC_MAX_LINK_NAME];
	149	struct tipc_media_addr media_addr;
	150	struct timer_list timer;
	151	struct tipc_node *owner;
	152	struct list_head link_list;
	153
	154	/* Management and link supervision data */
	155	int started;
	156	u32 checkpoint;
	157	u32 peer_session;
	158	u32 peer_bearer_id;
	159	struct tipc_bearer *b_ptr;
	160	u32 tolerance;
	161	u32 continuity_interval;
	162	u32 abort_limit;
	163	int state;
	164	u32 fsm_msg_cnt;
	165	struct {
	166	unchar hdr[INT_H_SIZE];
	167	unchar body[TIPC_MAX_IF_NAME];
	168	} proto_msg;
	169	struct tipc_msg *pmsg;
	170	u32 priority;
	171	u32 queue_limit[15]; /* queue_limit[0]==window limit */
	172
	173	/* Changeover */
	174	u32 exp_msg_count;
	175	u32 reset_checkpoint;
	176
	177	/* Max packet negotiation */
	178	u32 max_pkt;
	179	u32 max_pkt_target;
	180	u32 max_pkt_probes;
	181
	182	/* Sending */
	183	u32 out_queue_size;
	184	struct sk_buff *first_out;
	185	struct sk_buff *last_out;
	186	u32 next_out_no;
	187	u32 last_retransmitted;
	188	u32 stale_count;
	189
	190	/* Reception */
	191	u32 next_in_no;
	192	u32 deferred_inqueue_sz;
	193	struct sk_buff *oldest_deferred_in;
	194	struct sk_buff *newest_deferred_in;
	195	u32 unacked_window;
	196
	197	/* Congestion handling */
	198	struct sk_buff *proto_msg_queue;
	199	u32 retransm_queue_size;
	200	u32 retransm_queue_head;
	201	struct sk_buff *next_out;
	202	struct list_head waiting_ports;
	203
	204	/* Fragmentation/reassembly */
	205	u32 long_msg_seq_no;
	206	struct sk_buff *reasm_head;
	207	struct sk_buff *reasm_tail;
	208
	209	/* Statistics */
	210	struct tipc_stats stats;
	211	};
	212
	213	struct tipc_port;
	214
	215	struct tipc_link tipc_link_create(struct tipc_node n_ptr,
	216	struct tipc_bearer *b_ptr,
	217	const struct tipc_media_addr *media_addr);
	218	void tipc_link_delete(struct tipc_link *l_ptr);
	219	void tipc_link_failover_send_queue(struct tipc_link *l_ptr);
	220	void tipc_link_dup_send_queue(struct tipc_link *l_ptr,
	221	struct tipc_link *dest);
	222	void tipc_link_reset_fragments(struct tipc_link *l_ptr);
	223	int tipc_link_is_up(struct tipc_link *l_ptr);
	224	int tipc_link_is_active(struct tipc_link *l_ptr);
	225	void tipc_link_stop(struct tipc_link *l_ptr);
	226	struct sk_buff tipc_link_cmd_config(const void req_tlv_area,
	227	int req_tlv_space,
	228	u16 cmd);
	229	struct sk_buff tipc_link_cmd_show_stats(const void req_tlv_area,
	230	int req_tlv_space);
	231	struct sk_buff tipc_link_cmd_reset_stats(const void req_tlv_area,
	232	int req_tlv_space);
	233	void tipc_link_reset(struct tipc_link *l_ptr);
	234	int tipc_link_send(struct sk_buff *buf, u32 dest, u32 selector);
	235	void tipc_link_send_names(struct list_head *message_list, u32 dest);
	236	int tipc_link_send_buf(struct tipc_link l_ptr, struct sk_buff buf);
	237	u32 tipc_link_get_max_pkt(u32 dest, u32 selector);
	238	int tipc_link_send_sections_fast(struct tipc_port *sender,
	239	struct iovec const *msg_sect,
	240	unsigned int len, u32 destnode);
	241	void tipc_link_recv_bundle(struct sk_buff *buf);
	242	int tipc_link_recv_fragment(struct sk_buff **reasm_head,
	243	struct sk_buff **reasm_tail,
	244	struct sk_buff **fbuf);
	245	void tipc_link_send_proto_msg(struct tipc_link *l_ptr, u32 msg_typ, int prob,
	246	u32 gap, u32 tolerance, u32 priority,
	247	u32 acked_mtu);
	248	void tipc_link_push_queue(struct tipc_link *l_ptr);
	249	u32 tipc_link_defer_pkt(struct sk_buff head, struct sk_buff tail,
	250	struct sk_buff *buf);
	251	void tipc_link_wakeup_ports(struct tipc_link *l_ptr, int all);
	252	void tipc_link_set_queue_limits(struct tipc_link *l_ptr, u32 window);
	253	void tipc_link_retransmit(struct tipc_link *l_ptr,
	254	struct sk_buff *start, u32 retransmits);
	255
	256	/*
	257	* Link sequence number manipulation routines (uses modulo 2**16 arithmetic)
	258	*/
	259	static inline u32 buf_seqno(struct sk_buff *buf)
	260	{
	261	return msg_seqno(buf_msg(buf));
	262	}
	263
	264	static inline u32 mod(u32 x)
	265	{
	266	return x & 0xffffu;
	267	}
	268
	269	static inline int between(u32 lower, u32 upper, u32 n)
	270	{
	271	if ((lower < n) && (n < upper))
	272	return 1;
	273	if ((upper < lower) && ((n > lower) \|\| (n < upper)))
	274	return 1;
	275	return 0;
	276	}
	277
	278	static inline int less_eq(u32 left, u32 right)
	279	{
	280	return mod(right - left) < 32768u;
	281	}
	282
	283	static inline int less(u32 left, u32 right)
	284	{
	285	return less_eq(left, right) && (mod(right) != mod(left));
	286	}
	287
	288	static inline u32 lesser(u32 left, u32 right)
	289	{
	290	return less_eq(left, right) ? left : right;
	291	}
	292
	293
	294	/*
	295	* Link status checking routines
	296	*/
	297	static inline int link_working_working(struct tipc_link *l_ptr)
	298	{
	299	return l_ptr->state == WORKING_WORKING;
	300	}
	301
	302	static inline int link_working_unknown(struct tipc_link *l_ptr)
	303	{
	304	return l_ptr->state == WORKING_UNKNOWN;
	305	}
	306
	307	static inline int link_reset_unknown(struct tipc_link *l_ptr)
	308	{
	309	return l_ptr->state == RESET_UNKNOWN;
	310	}
	311
	312	static inline int link_reset_reset(struct tipc_link *l_ptr)
	313	{
	314	return l_ptr->state == RESET_RESET;
	315	}
	316
	317	static inline int link_congested(struct tipc_link *l_ptr)
	318	{
	319	return l_ptr->out_queue_size >= l_ptr->queue_limit[0];
	320	}
	321
	322	#endif