c++ - 如何获得ethtool设置？

请帮我获取ethtool设置(速度，双工，自动求反)。

如果使用ETHTOOL_GSET，我将获得ethtool设置。但是在ethtool.h中编写为使用ETHTOOL_GLINKSETTINGS而不是ETHTOOL_GSET。我不知道如何使用ETHTOOL_GLINKSETTINGS。

ETHTOOL_GSET

#include <stdio.h>
#include <string.h>
#include <net/if.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <linux/ethtool.h>
#include <linux/sockios.h>

int main()
{
    int s; // socket
    int r; // result

    struct ifreq ifReq;
    strncpy(ifReq.ifr_name, "enp3s0", sizeof(ifReq.ifr_name));

    struct ethtool_cmd ethtoolCmd;
    ethtoolCmd.cmd = ETHTOOL_GSET;
    ifReq.ifr_data = &ethtoolCmd;

    s = socket(AF_INET, SOCK_DGRAM, 0);
    if (s != -1)
    {
        r = ioctl(s, SIOCETHTOOL, &ifReq);
        if (s != -1)
        {
            printf("%s | ethtool_cmd.speed = %i \n", ifReq.ifr_name, ethtoolCmd.speed);
            printf("%s | ethtool_cmd.duplex = %i \n", ifReq.ifr_name, ethtoolCmd.duplex);
            printf("%s | ethtool_cmd.autoneg = %i \n", ifReq.ifr_name, ethtoolCmd.autoneg);
        }
        else
            printf("Error #r");

        close(s);
    }
    else
        printf("Error #s");

    return 0;
}

结果:

enp3s0 | ethtool_cmd.speed = 1000
enp3s0 | ethtool_cmd.duplex = 1
enp3s0 | ethtool_cmd.autoneg = 1

ETHTOOL_GLINKSETTINGS

#include <stdio.h>
#include <string.h>
#include <net/if.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <linux/ethtool.h>
#include <linux/sockios.h>

int main()
{
    int s; // socket
    int r; // result

    struct ifreq ifReq;
    strncpy(ifReq.ifr_name, "enp3s0", sizeof(ifReq.ifr_name));

    struct ethtool_link_settings ethtoolLinkSettings;
    ethtoolLinkSettings.cmd = ETHTOOL_GLINKSETTINGS;
    ifReq.ifr_data = &ethtoolLinkSettings;

    s = socket(AF_INET, SOCK_DGRAM, 0);
    if (s != -1)
    {
        r = ioctl(s, SIOCETHTOOL, &ifReq);
        if (s != -1)
        {
            printf("%s | ethtool_link_settings.speed = %i \n", ifReq.ifr_name, ethtoolLinkSettings.speed);
            printf("%s | ethtool_link_settings.duplex = %i \n", ifReq.ifr_name, ethtoolLinkSettings.duplex);
            printf("%s | ethtool_link_settings.autoneg = %i \n", ifReq.ifr_name, ethtoolLinkSettings.autoneg);
        }
        else
            printf("Error #r");

        close(s);
    }
    else
        printf("Error #s");

    return 0;
}

结果:

enp3s0 | ethtool_link_settings.speed = 0
enp3s0 | ethtool_link_settings.duplex = 45
enp3s0 | ethtool_link_settings.autoneg = 0

为什么ETHTOOL_GLINKSETTINGS返回不正确的值？问题是什么？

最佳答案

该问题是由以下错字引起的:

r = ioctl(s, SIOCETHTOOL, &ifReq);
    if (s != -1)

您本来要检查r的值，但是却错误地检查了s。
如果您纠正了该错误，我相信您会得到一个错误(EOPNOTSUPP，不支持操作)。