C++ (Cpp) snull_hw_tx Examples

Example #1

File: snull.c Project: dot-Sean/linux_drivers

/*
 * Transmit a packet (called by the kernel)
 */
int snull_tx(struct sk_buff *skb, struct net_device *dev)
{
    int len, retval=0;
    char *data;
    struct snull_priv *priv = (struct snull_priv *)dev->priv;

#ifndef LINUX_24
    if (dev->tbusy || skb == NULL) {
        PDEBUG("tint for %p, tbusy %ld, skb %p\n", dev, dev->tbusy, skb);
        snull_tx_timeout (dev);
        if (skb == NULL)
            return 0;
    }
#endif

    len = skb->len < ETH_ZLEN ? ETH_ZLEN : skb->len;
    data = skb->data;
    dev->trans_start = jiffies; /* save the timestamp */

    /* Remember the skb, so we can free it at interrupt time */
    priv->skb = skb;

    /* actual deliver of data is device-specific, and not shown here */
    snull_hw_tx(data, len, dev);

    return retval; /* zero == done; nonzero == fail */
}

Example #2

File: snull.c Project: umbrellary/raspberrykernel

/*
 * 当内核有需要发送的数据包时候调用此发包函数(used by kernel)
 */
 int snull_tx(struct sk_buff *skb, struct net_device *dev)
 {
    printk("snull_tx\n");

    int len;
    char *data;
    struct snull_priv *priv = netdev_priv(dev);

    len = skb->len < ETH_ZLEN ? ETH_ZLEN : skb->len;//ETH_ZLEN是所发的最小数据包的长度
    data = skb->data;//将要发送的数据包中数据部分
    dev->trans_start = jiffies;//保存当前的发送时间
    priv->skb = skb;

    snull_hw_tx(data, len, dev);//真正的发送函数

    return NETDEV_TX_OK;
}