enum {
       MaxEther        = 24,
       Ntypes          = 8,
};

typedef struct Ether Ether;
struct Ether {
       ISAConf;                        /* hardware info */

       int     ctlrno;
       int     tbdf;                   /* type+busno+devno+funcno */
       int     mbps;                   /* Mbps */
       int     minmtu;
       int     maxmtu;
       uchar   ea[Eaddrlen];

       void    (*attach)(Ether*);      /* filled in by reset routine */
       void    (*transmit)(Ether*);
       void    (*interrupt)(Ureg*, void*);
       long    (*ifstat)(Ether*, void*, long, ulong);
       long    (*ctl)(Ether*, void*, long); /* custom ctl messages */
       void    *ctlr;

       Queue*  oq;

       Netif;
};

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

#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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