Riverhead supports many Rx prefixes. The Rx prefix may be chosen
based on which information is required.
To have better performance choose the smallest Rx prefix which
meets our requirements.
Right now there is no way to specify requirements on Rx queue
creation, but it could be added in the future.
Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
Reviewed-by: Andy Moreton <amoreton@xilinx.com>
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