Condition that snmpd reads a register information on NIC

Issue

• Snmpd seems to read a register information on NIC by issuing ioctl(,SIOCGMIIPHY,).

[agent/mibgroup/if-mib/data_access/interface_linux.c]
/**
 * Determines network interface speed from MII
 */
unsigned long long
#ifdef HAVE_LINUX_ETHTOOL_H
netsnmp_linux_interface_get_if_speed_mii(int fd, const char *name)
#else
netsnmp_linux_interface_get_if_speed(int fd, const char *name)
#endif
{
<snip>
    if (ioctl(fd, 0x8947, &ifr) >= 0) {  <- *** issue ioctl(,SIOCGMIIPHY,) ***
        new_ioctl_nums = 1;
    } else if (ioctl(fd, SIOCDEVPRIVATE, &ifr) >= 0) {
        new_ioctl_nums = 0;
    } else {
        DEBUGMSGTL(("mibII/interfaces", "SIOCGMIIPHY on %s failed\n",
                    ifr.ifr_name));
        return retspeed;
    }

    /* Begin getting mii register values */
    phy_id = data[0];
    for (mii_reg = 0; mii_reg < 8; mii_reg++){
        data[0] = phy_id;
        data[1] = mii_reg;
        if(ioctl(fd, new_ioctl_nums ? 0x8948 : SIOCDEVPRIVATE+1, &ifr) <0){  <- *** issue ioctl(,SIOCGMIIPHY,) ***
            DEBUGMSGTL(("mibII/interfaces", "SIOCGMIIREG on %s failed\n", ifr.ifr_name));
        }
        mii_val[mii_reg] = data[3];
    }

• Could you tell us the condition of executing this processing?