对于一款芯片,经常要适配不同的板卡,适配不同的phy,前期为了确认phy是否工作正常,需要和硬件一起排查硬件,调试驱动,耗费较多软件工程师的时间。

本文可以提供一个mdio工具,由硬件工程师先确认phy硬件工作正常。

如下代码,使用相应的工具链编译生成可执行文件即可。

#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\n", mii->phy_id, mii->reg_num, mii->val_out);if(mii->reg_num == 1){if(mii->val_out&0x0004){printf("100M link up\n");}else{printf("100M link down\n");}}}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\n", mii->phy_id, mii->reg_num, mii->val_in);    } lab:    close(sockfd);    return 0;}