Alexander Duyck 7ec0116c91
igb: Use length to determine if descriptor is done ...
This change makes it so that we use the length of the packet instead of the
DD status bit to determine if a new descriptor is ready to be processed.
The obvious advantage is that it cuts down on reads as we don't really even
need the DD bit if going from a 0 to a non-zero value on size is enough to
inform us that the packet has been completed.
In addition I have updated the code so that we only reset the Rx descriptor
length for descriptor zero when resetting a ring instead of having to do a
memset with 0 over the entire ring. By doing this we can save some time on
initialization.
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com >
Tested-by: Aaron Brown <aaron.f.brown@intel.com >
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com >
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7ec0116c91