net/ip_tunnels: Introduce tunnel_id_to_key32() and key32_to_tunnel_id()
Add utility functions to convert a 32 bits key into a 64 bits tunnel and vice versa. These functions will be used instead of cloning code in GRE and VXLAN, and in tc act_iptunnel which will be introduced in a following patch in this patchset. Signed-off-by: NAmir Vadai <amir@vadai.me> Signed-off-by: NHadar Hen Zion <hadarh@mellanox.com> Reviewed-by: NShmulik Ladkani <shmulik.ladkani@gmail.com> Acked-by: NJiri Benc <jbenc@redhat.com> Acked-by: NJiri Pirko <jiri@mellanox.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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