在C中查找eth设备链路速度能力
我想得到一个eth设备的链接速度,它不是以编程方式插入C程序的 我的系统已连接eth6,但未连接eth8在C中查找eth设备链路速度能力,c,linux,networking,network-programming,C,Linux,Networking,Network Programming,我想得到一个eth设备的链接速度,它不是以编程方式插入C程序的 我的系统已连接eth6,但未连接eth8 # ethtool eth6 | egrep "modes|Speed|Link" Supported link modes: 10000baseT/Full Advertised link modes: 10000baseT/Full Speed: 10000Mb/s Link detected: yes # /u/aalmehdi/bin/etht
# ethtool eth6 | egrep "modes|Speed|Link"
Supported link modes: 10000baseT/Full
Advertised link modes: 10000baseT/Full
Speed: 10000Mb/s
Link detected: yes
# /u/aalmehdi/bin/ethtool eth8 | egrep "modes|Speed|Link"
Supported link modes: 10000baseT/Full
Advertised link modes: 10000baseT/Full
Speed: Unknown!
Link detected: no
我有以下C程序:
#include <ifaddrs.h>
#include <stdio.h>
#include <stdlib.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <linux/sockios.h>
#include <linux/ethtool.h>
#include <string.h>
int main(int argc, char *argv[])
{
struct ifaddrs *ifaddr, *ifa;
int family, n;
int sock;
struct ifreq ifr;
struct ethtool_cmd edata;
int rc;
if (getifaddrs(&ifaddr) == -1) {
perror("getifaddrs");
exit(EXIT_FAILURE);
}
sock = socket(PF_INET, SOCK_DGRAM, 0);
if (sock < 0) {
perror("socket");
exit(1);
}
for (ifa = ifaddr, n = 0; ifa != NULL; ifa = ifa->ifa_next, n++) {
if (ifa->ifa_addr == NULL)
continue;
family = ifa->ifa_addr->sa_family;
/* For an AF_PACKET (and physical eth) interface, display the speed */
if (family == AF_PACKET && ifa->ifa_data != NULL &&
((ifa->ifa_flags & (IFF_BROADCAST | IFF_MULTICAST)) ==
(IFF_BROADCAST | IFF_MULTICAST))) {
strncpy(ifr.ifr_name, ifa->ifa_name, sizeof(ifr.ifr_name));
ifr.ifr_data = (char *)&edata;
edata.cmd = ETHTOOL_GSET;
rc = ioctl(sock, SIOCETHTOOL, &ifr);
if (rc < 0) {
perror("ioctl");
exit(1);
}
printf("%-8s (ifa_flags = %x)\n",
ifa->ifa_name, ifa->ifa_flags);
switch (ethtool_cmd_speed(&edata)) {
case SPEED_10: printf("10Mbps\n"); break;
case SPEED_100: printf("100Mbps\n"); break;
case SPEED_1000: printf("1Gbps\n"); break;
case SPEED_2500: printf("2.5Gbps\n"); break;
case SPEED_10000: printf("10Gbps\n"); break;
default: printf("Speed returned is 0x%x\n", edata.speed);
}
}
}
freeifaddrs(ifaddr);
exit(EXIT_SUCCESS);
}
我真正想要的是访问ethtool显示的“支持的链接模式”或“广告链接模式”
有人能帮忙吗
谢谢,,
Ahmed.我通过查看ethtool源代码找到了答案。检查字段-
struct ethtool_cmd.supported
和struct ethtool_cmd.广告中设置的特定位
传送端口是否(可以运行)在10G速度/模式下
if (edata.supported & SUPPORTED_10000baseT_Full)
printf("-> 10G supported\n");
else
printf("-> 10G NOT supported\n");
if (edata.advertising & ADVERTISED_10000baseT_Full)
printf("-> 10G advertised\n");
else
printf("-> 10G NOT advertised\n");
以太网链路在连接时协商其链路速度。如果它没有插上电源,它就不知道可以协商的链接速度。@MikeW True,没有协商的速度。不过,请再看一看信息主题“链接速度能力”。eth端口或任何物理端口(IF、SATA、SAS、串行等)的性能(速度是其中之一)不受端口是否插入的影响。
if (edata.supported & SUPPORTED_10000baseT_Full)
printf("-> 10G supported\n");
else
printf("-> 10G NOT supported\n");
if (edata.advertising & ADVERTISED_10000baseT_Full)
printf("-> 10G advertised\n");
else
printf("-> 10G NOT advertised\n");