網卡芯片為realteak 8201

1.? net_device結構體的分配和注冊

???? 1) "/drivers/net/ethernet/sun7i/sun7i_wemac.c"

???? wemac_probe()

???????????? ndev = alloc_etherdev(sizeof(struct wemac_board_info));?????分配

???????????? ret = register_netdev(ndev);???????????????????????????????????????????????????注冊

???? 2) alloc_etherdev定義在?"/include/linux/etherdevice.h"

????#define alloc_etherdev(sizeof_priv) alloc_etherdev_mq(sizeof_priv, 1)
???? #define alloc_etherdev_mq(sizeof_priv, count) alloc_etherdev_mqs(sizeof_priv, count, count)

????3) alloc_etherdev_mqs定義在 "/net/ethernet/eth.c"

???? struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs,
?? ??? ??? ??? ?????? unsigned int rxqs)
???? {
?? ?????????? return alloc_netdev_mqs(sizeof_priv, "eth%d", ether_setup, txqs, rxqs);
???? }

2. 發包函數

???"/drivers/net/ethernet/sun7i/sun7i_wemac.c"

??? /*
?????? *? Hardware start transmission.
?????? *? Send a packet to media from the upper layer.
??? */
???? static int wemac_start_xmit(struct sk_buff *skb, struct net_device *dev)

???????????? 1) dev->stats.tx_bytes += skb->len;??????????????發包統計信息

???????????? 2)將skb數據寫入網卡

???????????? /* set TX len */
?? ??? ????? writel(skb->len, db->emac_vbase + EMAC_TX_PL0_REG);
?? ??? ????? /* start translate from fifo to phy */
?? ??? ???? writel(readl(db->emac_vbase + EMAC_TX_CTL0_REG)
?? ??? ??? ??? ?| 1, db->emac_vbase + EMAC_TX_CTL0_REG);
?? ??? ????? dev->trans_start = jiffies;?? ?/* save the time stamp */

???????????? 3) 釋放skb

???????????? dev_kfree_skb(skb); ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 釋放skb

???????????? 4) netif_stop_queue(dev);?????????????????????????停止隊列，數據發送完后由中斷處理程序來喚醒隊列

3. 中斷處理程序

??? static irqreturn_t wemac_interrupt(int irq, void *dev_id)

???? 1)? wemac_tx_done(dev, db, int_status)

????????? 當數據發送完后，產生中斷，此函數調用，然后調用netif_wake_queue(dev)來喚醒隊列

????2)? wemac_rx(dev)

????????? 接收數據包，最終調用netif_rx接收skb

4. MAC地址設置

?? "/drivers/net/ethernet/sun7i/sun7i_wemac.c"

?? static int wemac_set_mac_address(struct net_device *dev, void *p)

總結

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