linux/include/net/irda/irlap.h
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   1/*********************************************************************
   2 *                
   3 * Filename:      irlap.h
   4 * Version:       0.8
   5 * Description:   An IrDA LAP driver for Linux
   6 * Status:        Experimental.
   7 * Author:        Dag Brattli <dagb@cs.uit.no>
   8 * Created at:    Mon Aug  4 20:40:53 1997
   9 * Modified at:   Fri Dec 10 13:21:17 1999
  10 * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11 * 
  12 *     Copyright (c) 1998-1999 Dag Brattli <dagb@cs.uit.no>, 
  13 *     All Rights Reserved.
  14 *     Copyright (c) 2000-2002 Jean Tourrilhes <jt@hpl.hp.com>
  15 *     
  16 *     This program is free software; you can redistribute it and/or 
  17 *     modify it under the terms of the GNU General Public License as 
  18 *     published by the Free Software Foundation; either version 2 of 
  19 *     the License, or (at your option) any later version.
  20 *
  21 *     Neither Dag Brattli nor University of Tromsø admit liability nor
  22 *     provide warranty for any of this software. This material is 
  23 *     provided "AS-IS" and at no charge.
  24 *
  25 ********************************************************************/
  26
  27#ifndef IRLAP_H
  28#define IRLAP_H
  29
  30#include <linux/types.h>
  31#include <linux/skbuff.h>
  32#include <linux/netdevice.h>
  33#include <linux/timer.h>
  34
  35#include <net/irda/irqueue.h>           /* irda_queue_t */
  36#include <net/irda/qos.h>               /* struct qos_info */
  37#include <net/irda/discovery.h>         /* discovery_t */
  38#include <net/irda/irlap_event.h>       /* IRLAP_STATE, ... */
  39#include <net/irda/irmod.h>             /* struct notify_t */
  40
  41#define CONFIG_IRDA_DYNAMIC_WINDOW 1
  42
  43#define LAP_RELIABLE   1
  44#define LAP_UNRELIABLE 0
  45
  46#define LAP_ADDR_HEADER 1  /* IrLAP Address Header */
  47#define LAP_CTRL_HEADER 1  /* IrLAP Control Header */
  48
  49/* May be different when we get VFIR */
  50#define LAP_MAX_HEADER (LAP_ADDR_HEADER + LAP_CTRL_HEADER)
  51
  52/* Each IrDA device gets a random 32 bits IRLAP device address */
  53#define LAP_ALEN 4
  54
  55#define BROADCAST  0xffffffff /* Broadcast device address */
  56#define CBROADCAST 0xfe       /* Connection broadcast address */
  57#define XID_FORMAT 0x01       /* Discovery XID format */
  58
  59/* Nobody seems to use this constant. */
  60#define LAP_WINDOW_SIZE 8
  61/* We keep the LAP queue very small to minimise the amount of buffering.
  62 * this improve latency and reduce resource consumption.
  63 * This work only because we have synchronous refilling of IrLAP through
  64 * the flow control mechanism (via scheduler and IrTTP).
  65 * 2 buffers is the minimum we can work with, one that we send while polling
  66 * IrTTP, and another to know that we should not send the pf bit.
  67 * Jean II */
  68#define LAP_HIGH_THRESHOLD     2
  69/* Some rare non TTP clients don't implement flow control, and
  70 * so don't comply with the above limit (and neither with this one).
  71 * For IAP and management, it doesn't matter, because they never transmit much.
  72 *.For IrLPT, this should be fixed.
  73 * - Jean II */
  74#define LAP_MAX_QUEUE 10
  75/* Please note that all IrDA management frames (LMP/TTP conn req/disc and
  76 * IAS queries) fall in the second category and are sent to LAP even if TTP
  77 * is stopped. This means that those frames will wait only a maximum of
  78 * two (2) data frames before beeing sent on the "wire", which speed up
  79 * new socket setup when the link is saturated.
  80 * Same story for two sockets competing for the medium : if one saturates
  81 * the LAP, when the other want to transmit it only has to wait for
  82 * maximum three (3) packets (2 + one scheduling), which improve performance
  83 * of delay sensitive applications.
  84 * Jean II */
  85
  86#define NR_EXPECTED     1
  87#define NR_UNEXPECTED   0
  88#define NR_INVALID     -1
  89
  90#define NS_EXPECTED     1
  91#define NS_UNEXPECTED   0
  92#define NS_INVALID     -1
  93
  94/*
  95 *  Meta information passed within the IrLAP state machine
  96 */
  97struct irlap_info {
  98        __u8 caddr;   /* Connection address */
  99        __u8 control; /* Frame type */
 100        __u8 cmd;
 101
 102        __u32 saddr;
 103        __u32 daddr;
 104        
 105        int pf;        /* Poll/final bit set */
 106
 107        __u8  nr;      /* Sequence number of next frame expected */
 108        __u8  ns;      /* Sequence number of frame sent */
 109
 110        int  S;        /* Number of slots */
 111        int  slot;     /* Random chosen slot */
 112        int  s;        /* Current slot */
 113
 114        discovery_t *discovery; /* Discovery information */
 115};
 116
 117/* Main structure of IrLAP */
 118struct irlap_cb {
 119        irda_queue_t q;     /* Must be first */
 120        magic_t magic;
 121
 122        /* Device we are attached to */
 123        struct net_device  *netdev;
 124        char            hw_name[2*IFNAMSIZ + 1];
 125
 126        /* Connection state */
 127        volatile IRLAP_STATE state;       /* Current state */
 128
 129        /* Timers used by IrLAP */
 130        struct timer_list query_timer;
 131        struct timer_list slot_timer;
 132        struct timer_list discovery_timer;
 133        struct timer_list final_timer;
 134        struct timer_list poll_timer;
 135        struct timer_list wd_timer;
 136        struct timer_list backoff_timer;
 137
 138        /* Media busy stuff */
 139        struct timer_list media_busy_timer;
 140        int media_busy;
 141
 142        /* Timeouts which will be different with different turn time */
 143        int slot_timeout;
 144        int poll_timeout;
 145        int final_timeout;
 146        int wd_timeout;
 147
 148        struct sk_buff_head txq;  /* Frames to be transmitted */
 149        struct sk_buff_head txq_ultra;
 150
 151        __u8    caddr;        /* Connection address */
 152        __u32   saddr;        /* Source device address */
 153        __u32   daddr;        /* Destination device address */
 154
 155        int     retry_count;  /* Times tried to establish connection */
 156        int     add_wait;     /* True if we are waiting for frame */
 157
 158        __u8    connect_pending;
 159        __u8    disconnect_pending;
 160
 161        /*  To send a faster RR if tx queue empty */
 162#ifdef CONFIG_IRDA_FAST_RR
 163        int     fast_RR_timeout;
 164        int     fast_RR;      
 165#endif /* CONFIG_IRDA_FAST_RR */
 166        
 167        int N1; /* N1 * F-timer = Negitiated link disconnect warning threshold */
 168        int N2; /* N2 * F-timer = Negitiated link disconnect time */
 169        int N3; /* Connection retry count */
 170
 171        int     local_busy;
 172        int     remote_busy;
 173        int     xmitflag;
 174
 175        __u8    vs;            /* Next frame to be sent */
 176        __u8    vr;            /* Next frame to be received */
 177        __u8    va;            /* Last frame acked */
 178        int     window;        /* Nr of I-frames allowed to send */
 179        int     window_size;   /* Current negotiated window size */
 180
 181#ifdef CONFIG_IRDA_DYNAMIC_WINDOW
 182        __u32   line_capacity; /* Number of bytes allowed to send */
 183        __u32   bytes_left;    /* Number of bytes still allowed to transmit */
 184#endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
 185
 186        struct sk_buff_head wx_list;
 187
 188        __u8    ack_required;
 189        
 190        /* XID parameters */
 191        __u8    S;           /* Number of slots */
 192        __u8    slot;        /* Random chosen slot */
 193        __u8    s;           /* Current slot */
 194        int     frame_sent;  /* Have we sent reply? */
 195
 196        hashbin_t   *discovery_log;
 197        discovery_t *discovery_cmd;
 198
 199        __u32 speed;            /* Link speed */
 200
 201        struct qos_info  qos_tx;   /* QoS requested by peer */
 202        struct qos_info  qos_rx;   /* QoS requested by self */
 203        struct qos_info *qos_dev;  /* QoS supported by device */
 204
 205        notify_t notify; /* Callbacks to IrLMP */
 206
 207        int    mtt_required;  /* Minumum turnaround time required */
 208        int    xbofs_delay;   /* Nr of XBOF's used to MTT */
 209        int    bofs_count;    /* Negotiated extra BOFs */
 210        int    next_bofs;     /* Negotiated extra BOFs after next frame */
 211
 212        int    mode;     /* IrLAP mode (primary, secondary or monitor) */
 213};
 214
 215/* 
 216 *  Function prototypes 
 217 */
 218int irlap_init(void);
 219void irlap_cleanup(void);
 220
 221struct irlap_cb *irlap_open(struct net_device *dev, struct qos_info *qos,
 222                            const char *hw_name);
 223void irlap_close(struct irlap_cb *self);
 224
 225void irlap_connect_request(struct irlap_cb *self, __u32 daddr, 
 226                           struct qos_info *qos, int sniff);
 227void irlap_connect_response(struct irlap_cb *self, struct sk_buff *skb);
 228void irlap_connect_indication(struct irlap_cb *self, struct sk_buff *skb);
 229void irlap_connect_confirm(struct irlap_cb *, struct sk_buff *skb);
 230
 231void irlap_data_indication(struct irlap_cb *, struct sk_buff *, int unreliable);
 232void irlap_data_request(struct irlap_cb *, struct sk_buff *, int unreliable);
 233
 234#ifdef CONFIG_IRDA_ULTRA
 235void irlap_unitdata_request(struct irlap_cb *, struct sk_buff *);
 236void irlap_unitdata_indication(struct irlap_cb *, struct sk_buff *);
 237#endif /* CONFIG_IRDA_ULTRA */
 238
 239void irlap_disconnect_request(struct irlap_cb *);
 240void irlap_disconnect_indication(struct irlap_cb *, LAP_REASON reason);
 241
 242void irlap_status_indication(struct irlap_cb *, int quality_of_link);
 243
 244void irlap_test_request(__u8 *info, int len);
 245
 246void irlap_discovery_request(struct irlap_cb *, discovery_t *discovery);
 247void irlap_discovery_confirm(struct irlap_cb *, hashbin_t *discovery_log);
 248void irlap_discovery_indication(struct irlap_cb *, discovery_t *discovery);
 249
 250void irlap_reset_indication(struct irlap_cb *self);
 251void irlap_reset_confirm(void);
 252
 253void irlap_update_nr_received(struct irlap_cb *, int nr);
 254int irlap_validate_nr_received(struct irlap_cb *, int nr);
 255int irlap_validate_ns_received(struct irlap_cb *, int ns);
 256
 257int  irlap_generate_rand_time_slot(int S, int s);
 258void irlap_initiate_connection_state(struct irlap_cb *);
 259void irlap_flush_all_queues(struct irlap_cb *);
 260void irlap_wait_min_turn_around(struct irlap_cb *, struct qos_info *);
 261
 262void irlap_apply_default_connection_parameters(struct irlap_cb *self);
 263void irlap_apply_connection_parameters(struct irlap_cb *self, int now);
 264
 265#define IRLAP_GET_HEADER_SIZE(self) (LAP_MAX_HEADER)
 266#define IRLAP_GET_TX_QUEUE_LEN(self) skb_queue_len(&self->txq)
 267
 268/* Return TRUE if the node is in primary mode (i.e. master)
 269 * - Jean II */
 270static inline int irlap_is_primary(struct irlap_cb *self)
 271{
 272        int ret;
 273        switch(self->state) {
 274        case LAP_XMIT_P:
 275        case LAP_NRM_P:
 276                ret = 1;
 277                break;
 278        case LAP_XMIT_S:
 279        case LAP_NRM_S:
 280                ret = 0;
 281                break;
 282        default:
 283                ret = -1;
 284        }
 285        return(ret);
 286}
 287
 288/* Clear a pending IrLAP disconnect. - Jean II */
 289static inline void irlap_clear_disconnect(struct irlap_cb *self)
 290{
 291        self->disconnect_pending = FALSE;
 292}
 293
 294/*
 295 * Function irlap_next_state (self, state)
 296 *
 297 *    Switches state and provides debug information
 298 *
 299 */
 300static inline void irlap_next_state(struct irlap_cb *self, IRLAP_STATE state)
 301{
 302        /*
 303        if (!self || self->magic != LAP_MAGIC)
 304                return;
 305
 306        IRDA_DEBUG(4, "next LAP state = %s\n", irlap_state[state]);
 307        */
 308        self->state = state;
 309}
 310
 311#endif
 312
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