Merge branch 'gre-add-collect_md-mode-for-ERSPAN-tunnel'
William Tu says:
====================
gre: add collect_md mode for ERSPAN tunnel
This patch series provide collect_md mode for ERSPAN tunnel. The fist patch
refactors the existing gre_fb_xmit function by exacting the route cache
portion into a new function called prepare_fb_xmit. The second patch
introduces the collect_md mode for ERSPAN tunnel, by calling the
prepare_fb_xmit function and adding ERSPAN specific logic. The final patch
adds the test case using bpf_skb_{set,get}_tunnel_{key,opt}.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
