Merge branch 'generic-xdp-followups'

Daniel Borkmann says:

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Two generic xdp related follow-ups

Two follow-ups for the generic XDP API, would be great if
both could still be considered, since the XDP API is not
frozen yet. For details please see individual patches.

v1 -> v2:
  - Implemented feedback from Jakub Kicinski (reusing
    attribute on dump), thanks!
  - Rest as is.
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Signed-off-by: David S. Miller <davem@davemloft.net>