selftests: net: Test headroom handling of ip6_gre devices
Commit 5691484d ("net: ip6_gre: Fix headroom request in ip6erspan_tunnel_xmit()") and commit 01b8d064 ("net: ip6_gre: Request headroom in __gre6_xmit()") fix problems in reserving headroom in the packets tunneled through ip6gre/tap and ip6erspan netdevices. These two patches included snippets that reproduced the issues. This patch elevates the snippets to a full-fledged test case. Suggested-by: David Miller <davem@davemloft.net> Signed-off-by: Petr Machata <petrm@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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