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/usr/src/r8168-8.037.00/rtltool.h is in r8168-dkms 8.037.00-1.

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#ifndef _LINUX_RTLTOOL_H
#define _LINUX_RTLTOOL_H

#define SIOCRTLTOOL		SIOCDEVPRIVATE+1

enum rtl_cmd {
    RTLTOOL_READ_MAC=0,
    RTLTOOL_WRITE_MAC,
    RTLTOOL_READ_PHY,
    RTLTOOL_WRITE_PHY,
    RTLTOOL_READ_EPHY,
    RTLTOOL_WRITE_EPHY,
    RTLTOOL_READ_ERI,
    RTLTOOL_WRITE_ERI,
    RTLTOOL_READ_PCI,
    RTLTOOL_WRITE_PCI,
    RTLTOOL_READ_EEPROM,
    RTLTOOL_WRITE_EEPROM,

    RTL_ARP_NS_OFFLOAD,
    RTL_SET_OOB_IPMAC,
    RTL_READ_OOB_MAC,
    RTL_WRITE_OOB_MAC,

    RTLTOOL_INVALID
};

struct rtltool_cmd {
    __u32	cmd;
    __u32	offset;
    __u32	len;
    __u32	data;
    struct sockaddr ifru_addr;
    struct sockaddr ifru_netmask;
    struct sockaddr ifru_hwaddr;
};

enum mode_access {
    MODE_NONE=0,
    MODE_READ,
    MODE_WRITE
};

#ifdef __KERNEL__
int rtltool_ioctl(struct rtl8168_private *tp, struct ifreq *ifr);
#endif

#endif /* _LINUX_RTLTOOL_H */