if_start() is being used here as a way of kick-starting the new queue processing.  For if_transmit() style hardware drivers (which none publicly exist yet, for wireless) they will need to still implement if_start() but only to re-start the TX queue.
if_start() is being used here as a way of kick-starting the new queue
processing.  For if_transmit() style hardware drivers (which none publicly
exist yet, for wireless) they will need to still implement if_start()
but only to re-start the TX queue.

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