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alx: add msi-x support

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Add msi-x support to the alx driver. This is in preparation for multi queue
support.

msi-x interrupts are disabled by default because without multi queue support
there is no advantage over msi interrupts. The performance numbers observed
with iperf stay the same.

Based on information of the downstream driver at github.com/qca/alx

Signed-off-by: Tobias Regnery <tobias.regnery@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tobias Regnery 2016-09-09 12:19:54 +02:00 • committed by David S. Miller
commit dc39a78b3c
4 changed files with 184 additions and 8 deletions
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