Linux内核实践 - 如何添加网络协议[二]：实现

创建一种设备时，一定 会有设备的XXX_setup()初始化，大部分设备都会用ether_setup()来作初始化，再进行适当更改。下面是brcm_setup()：

void brcm_setup(struct net_device *dev)     
{     
 ether_setup(dev);     
         
 dev->priv_flags  |= IFF_BRCM_TAG;     
 dev->priv_flags  &= ~IFF_XMIT_DST_RELEASE;     
 dev->tx_queue_len = 0;     
         
 dev->netdev_ops  = &brcm_netdev_ops;     
 dev->destructor  = free_netdev;     
 dev->ethtool_ops = &brcm_ethtool_ops;     
         
 memset(dev->broadcast, 0, ETH_ALEN);     
}

其中发送函数就在brcm_netdev_ops中，每层设备都会这样调用：dev->netdev_ops->ndo_start_xmit()。

static const struct net_device_ops brcm_netdev_ops = {     
    .ndo_change_mtu     = brcm_dev_change_mtu,     
    .ndo_init       = brcm_dev_init,     
    .ndo_uninit     = brcm_dev_uninit,     
    .ndo_open       = brcm_dev_open,     
    .ndo_stop       = brcm_dev_stop,     
    .ndo_start_xmit =  brcm_dev_hard_start_xmit,     
    .ndo_validate_addr  = eth_validate_addr,     
    .ndo_set_mac_address    = brcm_dev_set_mac_address,     
    .ndo_set_rx_mode    = brcm_dev_set_rx_mode,     
    .ndo_set_multicast_list = brcm_dev_set_rx_mode,     
    .ndo_change_rx_flags    = brcm_dev_change_rx_flags,     
    //.ndo_do_ioctl     = brcm_dev_ioctl,     
    .ndo_neigh_setup    = brcm_dev_neigh_setup,     
    .ndo_get_stats      = brcm_dev_get_stats,     
};

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