RT-Thread-组件 lwip v2.0.3 版本使用 netdev网卡的 ping 功能RT-Thread问答社区

组件 lwip v2.0.3 版本使用 netdev网卡的 ping 功能

发布于 2024-12-04 09:27:16 浏览：131 订阅该版

[tocm]

# 一、版本说明
rt-thread 版本是 v4.1.1
lwip 版本：v2.0.3

# 二、ping 指令的使用
原代码：
```
int netdev_ping(int argc, char **argv)
{
    if (argc == 1)
    {
        rt_kprintf("Please input: ping [netdev name] <host address>\n");
    }
    else if (argc == 2)
    {
        netdev_cmd_ping(argv[1], RT_NULL, 4, 0);
    }
    else if (argc == 3)
    {
        netdev_cmd_ping(argv[1], argv[2], 4, 0);
    }

return 0;
}
MSH_CMD_EXPORT_ALIAS(netdev_ping, ping, ping network host);
```
输入 ping 指令，提示
```
Please input: ping [netdev name] <host address>
```

通过查看 netdev_cmd_ping 函数，可知实际应该是 
```
ping [host address] <netdev name>
```
netdev_cmd_ping 函数如下：
```
#ifdef NETDEV_USING_PING
int netdev_cmd_ping(char* target_name, char *netdev_name, rt_uint32_t times, rt_size_t size)
{
#define NETDEV_PING_DATA_SIZE       32
/** ping receive timeout - in milliseconds */
#define NETDEV_PING_RECV_TIMEO      (2 * RT_TICK_PER_SECOND)
/** ping delay - in milliseconds */
#define NETDEV_PING_DELAY           (1 * RT_TICK_PER_SECOND)
/* check netdev ping options */
#define NETDEV_PING_IS_COMMONICABLE(netdev) \
    ((netdev) && (netdev)->ops && (netdev)->ops->ping && \
        netdev_is_up(netdev) && netdev_is_link_up(netdev)) \

struct netdev *netdev = RT_NULL;
    struct netdev_ping_resp ping_resp;
    rt_uint32_t index;
    int ret = 0;

if (size == 0)
    {
        size = NETDEV_PING_DATA_SIZE;
    }

if (netdev_name != RT_NULL)
    {
        netdev = netdev_get_by_name(netdev_name);
        if (netdev == RT_NULL)
        {
            netdev = netdev_default;
            rt_kprintf("ping: not found specified netif, using default netdev %s.\n", netdev->name);
        }
    }

if (NETDEV_PING_IS_COMMONICABLE(netdev_default))
    {
        /* using default network interface device for ping */
        netdev = netdev_default;
    }
    else
    {
        /* using first internet up status network interface device */
        netdev = netdev_get_first_by_flags(NETDEV_FLAG_LINK_UP);
        if (netdev == RT_NULL)
        {
            rt_kprintf("ping: not found available network interface device.\n");
            return -RT_ERROR;
        }
        else if (netdev->ops == RT_NULL || netdev->ops->ping == RT_NULL)
        {
            rt_kprintf("ping: network interface device(%s) not support ping feature.\n", netdev->name);
            return -RT_ERROR;
        }
        else if (!netdev_is_up(netdev) || !netdev_is_link_up(netdev))
        {
            rt_kprintf("ping: network interface device(%s) status error.\n", netdev->name);
            return -RT_ERROR;
        }
    }

for (index = 0; index < times; index++)
    {
        int delay_tick = 0;
        rt_tick_t start_tick = 0;

rt_memset(&ping_resp, 0x00, sizeof(struct netdev_ping_resp));
        start_tick = rt_tick_get();
        ret = netdev->ops->ping(netdev, (const char *)target_name, size, NETDEV_PING_RECV_TIMEO, &ping_resp);
        if (ret == -RT_ETIMEOUT)
        {
            rt_kprintf("ping: from %s icmp_seq=%d timeout\n",
                (ip_addr_isany(&(ping_resp.ip_addr))) ? target_name : inet_ntoa(ping_resp.ip_addr), index);
        }
        else if (ret == -RT_ERROR)
        {
            rt_kprintf("ping: unknown %s %s\n",
                (ip_addr_isany(&(ping_resp.ip_addr))) ? "host" : "address",
                    (ip_addr_isany(&(ping_resp.ip_addr))) ? target_name : inet_ntoa(ping_resp.ip_addr));
        }
        else
        {
            if (ping_resp.ttl == 0)
            {
                rt_kprintf("%d bytes from %s icmp_seq=%d time=%d ms\n",
                            ping_resp.data_len, inet_ntoa(ping_resp.ip_addr), index, ping_resp.ticks);
            }
            else
            {
                rt_kprintf("%d bytes from %s icmp_seq=%d ttl=%d time=%d ms\n",
                            ping_resp.data_len, inet_ntoa(ping_resp.ip_addr), index, ping_resp.ttl, ping_resp.ticks);
            }
        }

/* if the response time is more than NETDEV_PING_DELAY, no need to delay */
        delay_tick = ((rt_tick_get() - start_tick) > NETDEV_PING_DELAY) || (index == times) ? 0 : NETDEV_PING_DELAY;
        rt_thread_delay(delay_tick);
    }

return RT_EOK;
}
```

# 二、多网卡指定网卡ping

多网卡指定网卡进行 ping ，发现使用的是默认网卡，查看 netdev_cmd_ping 函数

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20241203/e047e10323b3c85165fa316f858b8425.png)

判断的是默认网卡，修改如下
```
if(NETDEV_PING_IS_COMMONICABLE(netdev))//  netdev_default
{
	/* using default network interface device for ping */
	//netdev = netdev_default;
	if (netdev == RT_NULL)
	{
		netdev = netdev_default;
		rt_kprintf("ping: not found specified netif, using default netdev %s.\n", netdev->name);
	}
}
```

完整代码：
```
int netdev_cmd_ping(char* target_name, char *netdev_name, rt_uint32_t times, rt_size_t size)
{
#define NETDEV_PING_DATA_SIZE       32
/** ping receive timeout - in milliseconds */
#define NETDEV_PING_RECV_TIMEO      (2 * RT_TICK_PER_SECOND)
/** ping delay - in milliseconds */
#define NETDEV_PING_DELAY           (1 * RT_TICK_PER_SECOND)
/* check netdev ping options */
#define NETDEV_PING_IS_COMMONICABLE(netdev) \
    ((netdev) && (netdev)->ops && (netdev)->ops->ping && \
        netdev_is_up(netdev) && netdev_is_link_up(netdev)) \

struct netdev *netdev = RT_NULL;
    struct netdev_ping_resp ping_resp;
    rt_uint32_t index;
    int ret = 0;

if (size == 0)
    {
        size = NETDEV_PING_DATA_SIZE;
    }

if (NETDEV_PING_IS_COMMONICABLE(netdev))//  netdev_default
    {
        /* using default network interface device for ping */
        //netdev = netdev_default;
        if (netdev == RT_NULL)
        {
            netdev = netdev_default;
            rt_kprintf("ping: not found specified netif, using default netdev %s.\n", netdev->name);
        }
    }
    else
    {
        /* using first internet up status network interface device */
        netdev = netdev_get_first_by_flags(NETDEV_FLAG_LINK_UP);
        if (netdev == RT_NULL)
        {
            rt_kprintf("ping: not found available network interface device.\n");
            return -RT_ERROR;
        }
        else if (netdev->ops == RT_NULL || netdev->ops->ping == RT_NULL)
        {
            rt_kprintf("ping: network interface device(%s) not support ping feature.\n", netdev->name);
            return -RT_ERROR;
        }
        else if (!netdev_is_up(netdev) || !netdev_is_link_up(netdev))
        {
            rt_kprintf("ping: network interface device(%s) status error.\n", netdev->name);
            return -RT_ERROR;
        }
    }
    rt_kprintf("default netif %s.\n", netdev_default->name);
    rt_kprintf("ping:  found specified netif, using  netdev %s.\n", netdev->name);
    for (index = 0; index < times; index++)
    {
        int delay_tick = 0;
        rt_tick_t start_tick = 0;

return RT_EOK;
}
```

修改完，可使用指定网卡进行 ping 功能。