ixgbe: add XDP support for pass and drop actions
Basic XDP drop support for ixgbe. Uses READ_ONCE/xchg semantics on XDP programs instead of RCU primitives as suggested by Daniel Borkmann and Alex Duyck. v2: fix the build issues seen w/ XDP when page sizes are larger than 4K and made minor fixes based on feedback from Jakub Kicinski Signed-off-by: NJohn Fastabend <john.r.fastabend@intel.com> Acked-by: NAlexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
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