netsrv.h

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#ifndef __NETSRV_H__
#define __NETSRV_H__
 
#include <stdint.h>
 
#define NETSRV_RING_MAGIC    0x3154454Eu     /* 'NET1' */
#define NETSRV_SLOTS         32              /* per ring, a power of two */
#define NETSRV_SLOT_SIZE     2048
#define NETSRV_SLOT_HDR      8
#define NETSRV_MAX_FRAME     (NETSRV_SLOT_SIZE - NETSRV_SLOT_HDR)
#define NETSRV_TX_OFFSET     4096
#define NETSRV_RX_OFFSET     (NETSRV_TX_OFFSET + NETSRV_SLOTS * NETSRV_SLOT_SIZE)
#define NETSRV_RING_BYTES    (NETSRV_RX_OFFSET + NETSRV_SLOTS * NETSRV_SLOT_SIZE)
 
#define NETSRV_IOC_ATTACH    0x5501          /* arg: NetsrvAttach */
#define NETSRV_IOC_DETACH    0x5502
#define NETSRV_IOC_STATS     0x5503          /* arg: NetsrvStats  */
 
#define NETSRV_OK        0
#define NETSRV_E_PERM   -1
#define NETSRV_E_INVAL  -2
#define NETSRV_E_BUSY   -3
 
typedef struct {
    uint32_t magic;
    uint32_t slots;               /* NETSRV_SLOTS */
    uint32_t slot_size;           /* NETSRV_SLOT_SIZE */
    volatile uint32_t link;       /* 1 = link up (server writes) */
    uint8_t  mac[6];              /* filled in by the server before ATTACH */
    uint16_t reserved;
    volatile uint32_t tx_head, tx_tail;
    volatile uint32_t rx_head, rx_tail;
    volatile uint32_t tx_dropped;     /* frames the kernel discarded: ring full */
    volatile uint32_t rx_dropped;     /* frames the server discarded: ring full */
} NetRingHdr;
 
typedef struct { uint64_t ring_phys; uint64_t ring_len; } NetsrvAttach;
typedef struct { uint64_t tx_frames, rx_frames, tx_dropped, rx_bad; } NetsrvStats;
 
#endif