读取PHY的寄存器状态

#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>

#define reteck(ret)	\
	if(ret < 0){ \
		printf("%m! \"%s\" : line: %d\n", __func__, __LINE__); \
		goto lab; \
	}

#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);

int sockfd;

int main(int argc, char *argv[]){

	if(argc == 1 || !strcmp(argv[1], "-h")){ 
		help();
	}

	struct mii_ioctl_data *mii = NULL;
	struct ifreq ifr;
 	int ret;

	memset(&ifr, 0, sizeof(ifr));
	strncpy(ifr.ifr_name, argv[1], IFNAMSIZ - 1);

	sockfd = socket(PF_LOCAL, SOCK_DGRAM, 0);
 	reteck(sockfd);

	//get phy address in smi bus 
	ret = ioctl(sockfd, SIOCGMIIPHY, &ifr);
 	reteck(ret);

	mii = (struct mii_ioctl_data*)&ifr.ifr_data;

 	if(argc == 3){ 
 		mii->reg_num = (uint16_t)strtoul(argv[2], NULL, 0);

		ret = ioctl(sockfd, SIOCGMIIREG, &ifr);
 		reteck(ret);
 	
 		printf("read phy addr: 0x%x reg: 0x%x value : 0x%x\n", mii->phy_id, mii->reg_num, mii->val_out);
	}else if(argc == 4){

		mii->reg_num = (uint16_t)strtoul(argv[2], NULL, 0);
 		mii->val_in = (uint16_t)strtoul(argv[3], NULL, 0);

		ret = ioctl(sockfd, SIOCSMIIREG, &ifr);
 		reteck(ret);

		printf("write phy addr: 0x%x reg: 0x%x value : 0x%x\n", mii->phy_id, mii->reg_num, mii->val_in);
	} 

 lab: 
 	close(sockfd);

	return 0;
}