Merge branch 'xps-DCB'

Alexander Duyck says:

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Add support for XPS when using DCB

This patch series enables proper isolation between traffic classes when
using XPS while DCB is enabled.  Previously enabling XPS would cause the
traffic to be potentially pulled from one traffic class into another on
egress.  This change essentially multiplies the XPS map by the number of
traffic classes and allows us to do a lookup per traffic class for a given
CPU.

To guarantee the isolation I invalidate the XPS map for any queues that are
moved from one traffic class to another, or if we change the number of
traffic classes.

v2: Added sysfs to display traffic class
    Replaced do/while with for loop
    Cleaned up several other for for loops throughout the patch
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Signed-off-by: David S. Miller <davem@davemloft.net>