stmmac打印接收到的网卡数据
时间: 2023-08-08 13:14:12 浏览: 76
在 stmmac 中,接收到的网卡数据可以通过在接收函数中打印数据来进行调试。具体的实现方法如下:
```c
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/if_ether.h>
#include <linux/ip.h>
#include <linux/udp.h>
static rx_handler_result_t stmmac_rx_handler(struct sk_buff **pskb) {
struct sk_buff *skb = *pskb;
struct net_device *dev = skb->dev;
// 打印接收到的数据
printk(KERN_INFO "stmmac: received packet on %s\n", dev->name);
printk(KERN_INFO "stmmac: packet length = %d\n", skb->len);
// 解析以太网帧头部
struct ethhdr *eth = (struct ethhdr *)skb_mac_header(skb);
printk(KERN_INFO "stmmac: Ethernet destination address = %pM\n", eth->h_dest);
printk(KERN_INFO "stmmac: Ethernet source address = %pM\n", eth->h_source);
printk(KERN_INFO "stmmac: Ethernet type = %04x\n", ntohs(eth->h_proto));
// 解析 IP 数据包头部
if (eth->h_proto == htons(ETH_P_IP)) {
struct iphdr *ip = (struct iphdr *)skb_network_header(skb);
printk(KERN_INFO "stmmac: IP source address = %pI4\n", &ip->saddr);
printk(KERN_INFO "stmmac: IP destination address = %pI4\n", &ip->daddr);
printk(KERN_INFO "stmmac: IP protocol = %d\n", ip->protocol);
// 解析 UDP 数据包头部
if (ip->protocol == IPPROTO_UDP) {
struct udphdr *udp = (struct udphdr *)skb_transport_header(skb);
printk(KERN_INFO "stmmac: UDP source port = %d\n", ntohs(udp->source));
printk(KERN_INFO "stmmac: UDP destination port = %d\n", ntohs(udp->dest));
printk(KERN_INFO "stmmac: UDP length = %d\n", ntohs(udp->len));
}
}
return RX_HANDLER_PASS;
}
```
其中,`stmmac_rx_handler` 函数是 stmmac 接收函数的回调函数,当网卡接收到数据时,该函数会被调用。在该函数中,可以通过 `skb` 参数获取接收到的数据,并通过打印来进行调试。具体的打印内容包括网卡接收到的数据长度、以太网帧头部、IP 数据包头部、UDP 数据包头部等信息。
打印信息可以通过在控制台使用 `dmesg` 命令查看。