usr/src/sys/vax/datakit/new/dkdr.h

/*
 *      DATAKIT VCS Data Structures for a DR-11C interface
 *              @(#)dkdr.h      1.1 Garage 84/03/27
 */

/*
 *  Structure for each Datakit channel
 */

struct dkchan {
        short dk_state;
        struct ifqueue dk_outq;
        int (*dk_endfcn)();
        caddr_t dk_endparm;
        int     (*dk_supfcn)(); /* who to tell of circuit supervision */
        caddr_t dk_raddr;               /* address of received data */
        unsigned dk_rlen;               /* length of pending receive */
        short   dk_rmode;               /* possible completion modes */
        unsigned dk_xlen;               /* length of xmit */
        struct mbuf *dk_curout;         /* current buffer */
        struct dkpkbufr *dk_rq;         /* un-acked input */
        struct dkpkbufr *dk_rb;         /* un-checked input */
        short   dk_rblen;               /* len of unchecked */
        char    dk_S;                   /* protocol parameters */
        char    dk_R;
        char    dk_X;
        char    dk_A;
        char    dk_C;
        char    dk_trmode;
        char    dk_rseq;
        short   dk_tail1;
        short   dk_tail2;
        int     dk_rejcnt;              /* Reject messages received */
        int     dk_srejcnt;             /* Reject messages sent */
        int     dk_ackrejcnt;           /* Acks that cause retransmit */
        int     dk_enqcnt;              /* ENQs sent */
};

/* Flags for dk_X */
#define XM_OFF  ((char) 0xff)           /* transmitter off */
#define XM_INIT ((char) 02)             /* transmitter initialized */
#define XM_REJ  ((char) 04)             /* Sent REJ */
#define XM_ENQ  ((char) 010)            /* send ENQ next timeout */

/*
 * Packet buffers
 */

struct dkpkbufr {
        struct dkpkbufr *Pnext;
        short   Phibits;
        char Pseq;
        char Plen;
        char Pdata[16];
};

/*
 * Structure to save completion status until processed
 */

struct dkstat {
        short   k_type;         /* type of completion status */
        short   k_chan;         /* channel number */
        short   k_info1;                /* misc info */
        short   k_info2;
};