Linux编程:网络设备驱动详解
2009-06-30 04:36:00 来源:WEB开发网核心提示: 8,发包static void tg3_tx(struct tg3 *tp){struct tx_ring_info *ri = &tp->tx_buffers[sw_idx];struct sk_buff *skb = ri->skb;//以DMA方式向网卡传输包完毕pci_unmap_single(t
8,发包
static void tg3_tx(struct tg3 *tp)
{
struct tx_ring_info *ri = &tp->tx_buffers[sw_idx];
struct sk_buff *skb = ri->skb;
//以DMA方式向网卡传输包完毕
pci_unmap_single(tp->pdev, pci_unmap_addr(ri, mapping),
(skb->len - skb->data_len), PCI_DMA_TODEVICE);
ri->skb = NULL;
dev_kfree_skb_irq(skb);
}
9,收包
static int tg3_rx(struct tg3 *tp, int budget)
{
struct sk_buff *copy_skb;
//分配一个包
copy_skb = dev_alloc_skb(len + 2);
copy_skb->dev = tp->dev;
//修改包头空间
skb_reserve(copy_skb, 2);
//加入数据到包中
skb_put(copy_skb, len);
//以DMA方式从网卡传输回数据
pci_dma_sync_single(tp->pdev, dma_addr, len, PCI_DMA_FROMDEVICE);
memcpy(copy_skb->data, skb->data, len);
skb = copy_skb;
//解析包的协议
skb->protocol = eth_type_trans(skb, tp->dev);
//把包送到协议层
netif_rx(skb);
//记录收包时间
tp->dev->last_rx = jiffies;
}
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