ixgbevf: use length to determine if descriptor is done

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Based on:
commit 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 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: Emil Tantilov <emil.s.tantilov@intel.com>
Tested-by: Krishneil Singh <krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

...

This commit is contained in:

Emil Tantilov 2017-12-11 10:36:59 -08:00 • committed by Jeff Kirsher

parent 68b6ff5825

commit 24bff091d7

1 changed files with 8 additions and 6 deletions

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drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c

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