How to send data directly out network interface from driver?

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I have a voip device where I currently send my data up/down between driver
 and user space using an interrupt driven read/write scheme. I send/recv
 the data using standard UDP packets in userspace. I'd like to try to decrease
 my end-to-end latency by letting the driver send/recv most of this
data directly
 to the network.

Are there drivers which already do this kind of thing that I might learn from?

Thanks for any help, including redirection to more appropriate places to ask.

-Bob

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