Arthur Kiyanovski says:

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ena: fixes of interrupt moderation bugs

Differences from V1:
1. Updated default tx interrupt moderation to 64us
2. Added "Fixes:" tags.
3. Removed cosmetic changes that are not relevant for these bug fixes

This patchset includes a couple of fixes of bugs in the implemenation of
interrupt moderation.
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Signed-off-by: David S. Miller <davem@davemloft.net>