tunnel: Mark GRE64 tunnel protocol deprecated.
GRE64 was introduced to extend GRE key from 32-bit to 64-bit using key and sequence number field. But GRE64 is not standard protocol. There are not many users of this protocol. Therefore we have decided to deprecate it. Since GRE64 is not in upstream OVS kernel module removing it will bring upstream and out-of-tree module closer. Signed-off-by: Pravin B Shelar <firstname.lastname@example.org> Acked-by: Jesse Gross <email@example.com>
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