usr/src/sys/netccitt/hd_var.h

/*
 * Copyright (c) University of British Columbia, 1984
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Laboratory for Computation Vision and the Computer Science Department
 * of the University of British Columbia.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)hd_var.h    7.4 (Berkeley) %G%
 */

/*
 *
 * hdlc control block
 *
 */

struct  hdtxq {
        struct  mbuf *head;
        struct  mbuf *tail;
};

struct  hdcb {
        struct  hdcb *hd_next;  /* pointer to next hdlc control block */
        char    hd_state;       /* link state */
        char    hd_vs;          /* send state variable */
        char    hd_vr;          /* receive state variable */
        char    hd_lastrxnr;    /* last received N(R) */
        char    hd_lasttxnr;    /* last transmitted N(R) */
        char    hd_condition;
#define TIMER_RECOVERY_CONDITION        0x01
#define REJ_CONDITION                   0x02
#define REMOTE_RNR_CONDITION            0X04
        char    hd_retxcnt;
        char    hd_xx;
        struct  hdtxq hd_txq;
        struct  mbuf *hd_retxq[MODULUS];
        char    hd_retxqi;
        char    hd_rrtimer;
        char    hd_timer;
#define SET_TIMER(hdp)          hdp->hd_timer = hd_t1
#define KILL_TIMER(hdp)         hdp->hd_timer = 0
        char    hd_dontcopy;    /* if-driver doesn't free I-frames */
        struct  ifnet *hd_ifp;  /* device's network visible interface */
        struct  ifaddr *hd_ifa; /* device's X.25 network address */
        struct  x25config *hd_xcp;
        caddr_t hd_pkp;         /* Level III junk */
        int     (*hd_output)(); /* separate entry for HDLC direct output */

        /* link statistics */

        long    hd_iframes_in;
        long    hd_iframes_out;
        long    hd_rrs_in;
        long    hd_rrs_out;
        short   hd_rejs_in;
        short   hd_rejs_out;
        long    hd_window_condition;
        short   hd_invalid_ns;
        short   hd_invalid_nr;
        short   hd_timeouts;
        short   hd_resets;
        short   hd_unknown;
        short   hd_frmrs_in;
        short   hd_frmrs_out;
        short   hd_rnrs_in;
        short   hd_rnrs_out;
};

#ifdef KERNEL
struct  hdcb *hdcbhead;         /* head of linked list of hdcb's */
struct  Frmr_frame hd_frmr;     /* rejected frame diagnostic info */
struct  ifqueue hdintrq;        /* hdlc packet input queue */

int     hd_t1;                  /* timer T1 value */
int     hd_t3;                  /* RR send timer */
int     hd_n2;                  /* frame retransmission limit */
#endif