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linux/include/net/irda/irlap.h

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/*********************************************************************
*
* Filename: irlap.h
* Version: 0.8
* Description: An IrDA LAP driver for Linux
* Status: Experimental.
* Author: Dag Brattli <dagb@cs.uit.no>
* Created at: Mon Aug 4 20:40:53 1997
* Modified at: Fri Dec 10 13:21:17 1999
* Modified by: Dag Brattli <dagb@cs.uit.no>
*
* Copyright (c) 1998-1999 Dag Brattli <dagb@cs.uit.no>,
* All Rights Reserved.
* Copyright (c) 2000-2002 Jean Tourrilhes <jt@hpl.hp.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* Neither Dag Brattli nor University of Tromsø admit liability nor
* provide warranty for any of this software. This material is
* provided "AS-IS" and at no charge.
*
********************************************************************/
#ifndef IRLAP_H
#define IRLAP_H
#include <linux/types.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/timer.h>
#include <net/irda/irqueue.h> /* irda_queue_t */
#include <net/irda/qos.h> /* struct qos_info */
#include <net/irda/discovery.h> /* discovery_t */
#include <net/irda/irlap_event.h> /* IRLAP_STATE, ... */
#include <net/irda/irmod.h> /* struct notify_t */
#define CONFIG_IRDA_DYNAMIC_WINDOW 1
#define LAP_RELIABLE 1
#define LAP_UNRELIABLE 0
#define LAP_ADDR_HEADER 1 /* IrLAP Address Header */
#define LAP_CTRL_HEADER 1 /* IrLAP Control Header */
/* May be different when we get VFIR */
#define LAP_MAX_HEADER (LAP_ADDR_HEADER + LAP_CTRL_HEADER)
/* Each IrDA device gets a random 32 bits IRLAP device address */
#define LAP_ALEN 4
#define BROADCAST 0xffffffff /* Broadcast device address */
#define CBROADCAST 0xfe /* Connection broadcast address */
#define XID_FORMAT 0x01 /* Discovery XID format */
/* Nobody seems to use this constant. */
#define LAP_WINDOW_SIZE 8
/* We keep the LAP queue very small to minimise the amount of buffering.
* this improve latency and reduce resource consumption.
* This work only because we have synchronous refilling of IrLAP through
* the flow control mechanism (via scheduler and IrTTP).
* 2 buffers is the minimum we can work with, one that we send while polling
* IrTTP, and another to know that we should not send the pf bit.
* Jean II */
#define LAP_HIGH_THRESHOLD 2
/* Some rare non TTP clients don't implement flow control, and
* so don't comply with the above limit (and neither with this one).
* For IAP and management, it doesn't matter, because they never transmit much.
*.For IrLPT, this should be fixed.
* - Jean II */
#define LAP_MAX_QUEUE 10
/* Please note that all IrDA management frames (LMP/TTP conn req/disc and
* IAS queries) fall in the second category and are sent to LAP even if TTP
* is stopped. This means that those frames will wait only a maximum of
* two (2) data frames before beeing sent on the "wire", which speed up
* new socket setup when the link is saturated.
* Same story for two sockets competing for the medium : if one saturates
* the LAP, when the other want to transmit it only has to wait for
* maximum three (3) packets (2 + one scheduling), which improve performance
* of delay sensitive applications.
* Jean II */
#define NR_EXPECTED 1
#define NR_UNEXPECTED 0
#define NR_INVALID -1
#define NS_EXPECTED 1
#define NS_UNEXPECTED 0
#define NS_INVALID -1
/*
* Meta information passed within the IrLAP state machine
*/
struct irlap_info {
__u8 caddr; /* Connection address */
__u8 control; /* Frame type */
__u8 cmd;
__u32 saddr;
__u32 daddr;
int pf; /* Poll/final bit set */
__u8 nr; /* Sequence number of next frame expected */
__u8 ns; /* Sequence number of frame sent */
int S; /* Number of slots */
int slot; /* Random chosen slot */
int s; /* Current slot */
discovery_t *discovery; /* Discovery information */
};
/* Main structure of IrLAP */
struct irlap_cb {
irda_queue_t q; /* Must be first */
magic_t magic;
/* Device we are attached to */
struct net_device *netdev;
char hw_name[2*IFNAMSIZ + 1];
/* Connection state */
volatile IRLAP_STATE state; /* Current state */
/* Timers used by IrLAP */
struct timer_list query_timer;
struct timer_list slot_timer;
struct timer_list discovery_timer;
struct timer_list final_timer;
struct timer_list poll_timer;
struct timer_list wd_timer;
struct timer_list backoff_timer;
/* Media busy stuff */
struct timer_list media_busy_timer;
int media_busy;
/* Timeouts which will be different with different turn time */
int slot_timeout;
int poll_timeout;
int final_timeout;
int wd_timeout;
struct sk_buff_head txq; /* Frames to be transmitted */
struct sk_buff_head txq_ultra;
__u8 caddr; /* Connection address */
__u32 saddr; /* Source device address */
__u32 daddr; /* Destination device address */
int retry_count; /* Times tried to establish connection */
int add_wait; /* True if we are waiting for frame */
__u8 connect_pending;
__u8 disconnect_pending;
/* To send a faster RR if tx queue empty */
#ifdef CONFIG_IRDA_FAST_RR
int fast_RR_timeout;
int fast_RR;
#endif /* CONFIG_IRDA_FAST_RR */
int N1; /* N1 * F-timer = Negitiated link disconnect warning threshold */
int N2; /* N2 * F-timer = Negitiated link disconnect time */
int N3; /* Connection retry count */
int local_busy;
int remote_busy;
int xmitflag;
__u8 vs; /* Next frame to be sent */
__u8 vr; /* Next frame to be received */
__u8 va; /* Last frame acked */
int window; /* Nr of I-frames allowed to send */
int window_size; /* Current negotiated window size */
#ifdef CONFIG_IRDA_DYNAMIC_WINDOW
__u32 line_capacity; /* Number of bytes allowed to send */
__u32 bytes_left; /* Number of bytes still allowed to transmit */
#endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
struct sk_buff_head wx_list;
__u8 ack_required;
/* XID parameters */
__u8 S; /* Number of slots */
__u8 slot; /* Random chosen slot */
__u8 s; /* Current slot */
int frame_sent; /* Have we sent reply? */
hashbin_t *discovery_log;
discovery_t *discovery_cmd;
__u32 speed; /* Link speed */
struct qos_info qos_tx; /* QoS requested by peer */
struct qos_info qos_rx; /* QoS requested by self */
struct qos_info *qos_dev; /* QoS supported by device */
notify_t notify; /* Callbacks to IrLMP */
int mtt_required; /* Minumum turnaround time required */
int xbofs_delay; /* Nr of XBOF's used to MTT */
int bofs_count; /* Negotiated extra BOFs */
int next_bofs; /* Negotiated extra BOFs after next frame */
int mode; /* IrLAP mode (primary, secondary or monitor) */
};
/*
* Function prototypes
*/
int irlap_init(void);
void irlap_cleanup(void);
struct irlap_cb *irlap_open(struct net_device *dev, struct qos_info *qos,
const char *hw_name);
void irlap_close(struct irlap_cb *self);
void irlap_connect_request(struct irlap_cb *self, __u32 daddr,
struct qos_info *qos, int sniff);
void irlap_connect_response(struct irlap_cb *self, struct sk_buff *skb);
void irlap_connect_indication(struct irlap_cb *self, struct sk_buff *skb);
void irlap_connect_confirm(struct irlap_cb *, struct sk_buff *skb);
void irlap_data_indication(struct irlap_cb *, struct sk_buff *, int unreliable);
void irlap_data_request(struct irlap_cb *, struct sk_buff *, int unreliable);
#ifdef CONFIG_IRDA_ULTRA
void irlap_unitdata_request(struct irlap_cb *, struct sk_buff *);
void irlap_unitdata_indication(struct irlap_cb *, struct sk_buff *);
#endif /* CONFIG_IRDA_ULTRA */
void irlap_disconnect_request(struct irlap_cb *);
void irlap_disconnect_indication(struct irlap_cb *, LAP_REASON reason);
void irlap_status_indication(struct irlap_cb *, int quality_of_link);
void irlap_test_request(__u8 *info, int len);
void irlap_discovery_request(struct irlap_cb *, discovery_t *discovery);
void irlap_discovery_confirm(struct irlap_cb *, hashbin_t *discovery_log);
void irlap_discovery_indication(struct irlap_cb *, discovery_t *discovery);
void irlap_reset_indication(struct irlap_cb *self);
void irlap_reset_confirm(void);
void irlap_update_nr_received(struct irlap_cb *, int nr);
int irlap_validate_nr_received(struct irlap_cb *, int nr);
int irlap_validate_ns_received(struct irlap_cb *, int ns);
int irlap_generate_rand_time_slot(int S, int s);
void irlap_initiate_connection_state(struct irlap_cb *);
void irlap_flush_all_queues(struct irlap_cb *);
void irlap_wait_min_turn_around(struct irlap_cb *, struct qos_info *);
void irlap_apply_default_connection_parameters(struct irlap_cb *self);
void irlap_apply_connection_parameters(struct irlap_cb *self, int now);
#define IRLAP_GET_HEADER_SIZE(self) (LAP_MAX_HEADER)
#define IRLAP_GET_TX_QUEUE_LEN(self) skb_queue_len(&self->txq)
/* Return TRUE if the node is in primary mode (i.e. master)
* - Jean II */
static inline int irlap_is_primary(struct irlap_cb *self)
{
int ret;
switch(self->state) {
case LAP_XMIT_P:
case LAP_NRM_P:
ret = 1;
break;
case LAP_XMIT_S:
case LAP_NRM_S:
ret = 0;
break;
default:
ret = -1;
}
return(ret);
}
/* Clear a pending IrLAP disconnect. - Jean II */
static inline void irlap_clear_disconnect(struct irlap_cb *self)
{
self->disconnect_pending = FALSE;
}
/*
* Function irlap_next_state (self, state)
*
* Switches state and provides debug information
*
*/
static inline void irlap_next_state(struct irlap_cb *self, IRLAP_STATE state)
{
/*
if (!self || self->magic != LAP_MAGIC)
return;
IRDA_DEBUG(4, "next LAP state = %s\n", irlap_state[state]);
*/
self->state = state;
}
#endif
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