igb: Use length to determine if descriptor is done

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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>

...

This commit is contained in:

Alexander Duyck 2017-02-06 18:25:41 -08:00 • committed by Jeff Kirsher

parent 7bd1759282

commit 7ec0116c91

2 changed files with 9 additions and 7 deletions

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2

drivers/net/ethernet/intel/igb/igb_ethtool.c

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14

drivers/net/ethernet/intel/igb/igb_main.c

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