am335x_cpsw_switch fail

am335x_cpsw_switch

#include <stdio.h>
#include <linux/net_switch_config.h>
#include <asm/sockios.h>
#include <net/if.h>
#include <string.h>
#include <linux/sockios.h>
#include <errno.h>

int main(void)
{
        struct net_switch_config cmd_struct;
        struct ifreq ifr;
        int sockfd;
        strncpy(ifr.ifr_name, "eth0", IFNAMSIZ);
        ifr.ifr_data = (char*)&cmd_struct;
        if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
                printf("Can't open the socket\n");
                return -1;
        }
        memset(&cmd_struct, 0, sizeof(struct net_switch_config));
 
        //initialise cmd_struct with switch commands

        if (ioctl(sockfd, SIOCSWITCHCONFIG, &ifr) < 0) {
                printf("Command failed\n");
                close(sockfd);
                return -1;
        } 
        printf("command success\n");
        close(sockfd);
        return 0;
}