linux 系统下网卡phy读写程序

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <linux/mii.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <linux/sockios.h>
#include <linux/types.h>
#include <netinet/in.h>
#include <unistd.h>

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#define reteck(ret) \
if(ret < 0){ \
printf("%m! \"%s\" : line: %d\n", __func__, __LINE__); \
goto lab; \
}
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#define help() \
printf("mdio:\n"); \
printf("read operation: mdio reg_addr\n"); \
printf("write operation: mdio reg_addr value\n"); \
printf("For example:\n"); \
printf("mdio eth0 1\n"); \
printf("mdio eth0 0 0x12\n\n"); \
exit(0);
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int sockfd;
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int main(int argc, char *argv[])
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{
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if(argc == 1 || !strcmp(argv[1], "-h")){
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help();
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}
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struct mii_ioctl_data *mii = NULL;
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struct ifreq ifr;
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int ret;
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memset(&ifr, 0, sizeof(ifr));
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strncpy(ifr.ifr_name, argv[1], IFNAMSIZ - 1);
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sockfd = socket(PF_LOCAL, SOCK_DGRAM, 0);
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reteck(sockfd);
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//get phy address in smi bus
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ret = ioctl(sockfd, SIOCGMIIPHY, &ifr);
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reteck(ret);
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mii = (struct mii_ioctl_data*)&ifr.ifr_data;
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if(argc == 3){
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mii->reg_num = (uint16_t)strtoul(argv[2], NULL, 0);
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ret = ioctl(sockfd, SIOCGMIIREG, &ifr);
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reteck(ret);
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printf("read phy addr: 0x%x reg: 0x%x value : 0x%x\n\n", mii->phy_id, mii->reg_num, mii->val_out);
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}else if(argc == 4){
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mii->reg_num = (uint16_t)strtoul(argv[2], NULL, 0);
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mii->val_in = (uint16_t)strtoul(argv[3], NULL, 0);
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ret = ioctl(sockfd, SIOCSMIIREG, &ifr);
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reteck(ret);
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printf("write phy addr: 0x%x reg: 0x%x value : 0x%x\n\n", mii->phy_id, mii->reg_num, mii->val_in);
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}
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lab:
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close(sockfd);
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return 0;
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}
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使用用法：

mdio:
read operation: mdio reg_addr
write operation: mdio reg_addr value
For example:
mdio eth0 1
mdio eth0 0 0x12
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