enum {
       MaxEther        = 64,
       Ntypes          = 8,
};

typedef struct Macent Macent;
struct Macent
{
       uchar   ea[Eaddrlen];
       ushort  port;
};

typedef struct Ether Ether;
struct Ether {
       ISAConf;                        /* hardware info */
       int     tbdf;                   /* type+busno+devno+funcno */

       int     ctlrno;
       int     minmtu;
       int     maxmtu;

       void    (*attach)(Ether*);      /* filled in by reset routine */
       void    (*transmit)(Ether*);
       long    (*ifstat)(Ether*, void*, long, ulong);
       long    (*ctl)(Ether*, void*, long); /* custom ctl messages */
       void    (*power)(Ether*, int);  /* power on/off */
       void    (*shutdown)(Ether*);    /* shutdown hardware before reboot */
       void    *ctlr;

       Queue*  oq;

       Netif;

       uchar   ea[Eaddrlen];
       Macent  mactab[127];            /* for bridge */
};

extern void etheriq(Ether*, Block*);
extern void addethercard(char*, int(*)(Ether*));
extern ulong ethercrc(uchar*, int);
extern int parseether(uchar*, char*);

#define NEXT(x, l)      (((x)+1)%(l))
#define PREV(x, l)      (((x) == 0) ? (l)-1: (x)-1)
#define HOWMANY(x, y)   (((x)+((y)-1))/(y))
#define ROUNDUP(x, y)   (HOWMANY((x), (y))*(y))

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