linux - 驱动程序是否使用 Linux NAPI 接口(interface)？

Question

有没有办法确认 Linux 以太网驱动程序是否正在使用 NAPI 接口(interface)？

Answer 1

我知道这听起来像是一个显而易见的答案，但请检查源代码以查看是否正在使用 NAPI API。
例如:

• 在您的驱动程序的中断处理程序中，它是否使用以下任何调用？
• 您的驱动程序是否为 NAPI 实现了 poll() 方法？如果是这样，看看它是否使用netif_receive_skb() 而不是 netif_rx()。

如果这两个问题的答案都是"is"，则说明您的驱动程序正在使用 NAPI。

注:以下内容复制自here

NAPI API

netif_rx_schedule(dev) 
    Called by an IRQ handler to schedule a poll for device
netif_rx_schedule_prep(dev) 
    puts the device in a state ready to be added to the CPU polling list if it is up and running. You can look at this as the first half of netif_rx_schedule(dev).
__netif_rx_schedule(dev) 
    Add device to the poll list for this CPU; assuming that netif_schedule_prep(dev) has already been called and returned 1
__netif_rx_schedule_prep(dev) 
    similar to netif_rx_schedule_prep(dev) but no check if device is up, usually not used
netif_rx_reschedule(dev, undo) 
    Called to reschedule polling for device specifically for some deficient hardware.
netif_rx_complete(dev) 
    Remove interface from the CPU poll list: it must be in the poll list on current cpu. This primitive is called by dev->poll(), when it completes its work. The device cannot be out of poll list at this call, if it is then clearly it is a BUG().
__netif_rx_complete(dev) 
    same as netif_rx_complete but called when local interrupts are already disabled.

看看这个 wikipedia article以及其中的外部链接以获得更详细的信息。

希望对您有所帮助。