mlxsw: spectrum_router: Compare key with correct object type

When comparing a key with a nexthop group in rhastable's obj_cmpfn()
callback, make sure that the key and nexthop group are of the same type
(i.e., IPv4 / IPv6).

The bug is not currently visible because IPv6 nexthop groups do not
populate the FIB info pointer and IPv4 nexthop groups do not set the
ifindex for the individual nexthops.
Signed-off-by: NIdo Schimmel <idosch@nvidia.com>
Reviewed-by: NJiri Pirko <jiri@nvidia.com>
Signed-off-by: NJakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c

@@ -3040,6 +3040,12 @@ mlxsw_sp_nexthop6_group_cmp(const struct mlxsw_sp_nexthop_group *nh_grp,
 	return true;
 }
 
+static int
+mlxsw_sp_nexthop_group_type(const struct mlxsw_sp_nexthop_group *nh_grp)
+{
+	return nh_grp->neigh_tbl->family;
+}
+
 static int
 mlxsw_sp_nexthop_group_cmp(struct rhashtable_compare_arg *arg, const void *ptr)
 {
@@ -3048,8 +3054,12 @@ mlxsw_sp_nexthop_group_cmp(struct rhashtable_compare_arg *arg, const void *ptr)
 
 	switch (cmp_arg->proto) {
 	case MLXSW_SP_L3_PROTO_IPV4:
+		if (mlxsw_sp_nexthop_group_type(nh_grp) != AF_INET)
+			return 1;
 		return cmp_arg->fi != mlxsw_sp_nexthop4_group_fi(nh_grp);
 	case MLXSW_SP_L3_PROTO_IPV6:
+		if (mlxsw_sp_nexthop_group_type(nh_grp) != AF_INET6)
+			return 1;
 		return !mlxsw_sp_nexthop6_group_cmp(nh_grp,
 						    cmp_arg->fib6_entry);
 	default:
@@ -3058,12 +3068,6 @@ mlxsw_sp_nexthop_group_cmp(struct rhashtable_compare_arg *arg, const void *ptr)
 	}
 }
 
-static int
-mlxsw_sp_nexthop_group_type(const struct mlxsw_sp_nexthop_group *nh_grp)
-{
-	return nh_grp->neigh_tbl->family;
-}
-
 static u32 mlxsw_sp_nexthop_group_hash_obj(const void *data, u32 len, u32 seed)
 {
 	const struct mlxsw_sp_nexthop_group *nh_grp = data;