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720ccd9a72
Most of the code that deals with nexthop groups relies on the fact that the group is of exactly one well-known type. Currently there is only one type, "mpath", but as more next-hop group types come, it becomes desirable to have a central place where the setting is validated. Introduce such place into nexthop_create_group(), such that the check is done before the code that relies on that invariant is invoked. Signed-off-by: Petr Machata <petrm@nvidia.com> Reviewed-by: Ido Schimmel <idosch@nvidia.com> Reviewed-by: David Ahern <dsahern@kernel.org> Signed-off-by: Jakub Kicinski <kuba@kernel.org>