mlxsw: emad: Add support for latency TLV

The next patches will add support for latency TLV as part of EMAD (Ethernet
Management Datagrams) packets. As preparation, add the relevant values.
Signed-off-by: Danielle Ratson <danieller@nvidia.com>
Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mellanox/mlxsw/emad.h

@@ -21,6 +21,7 @@ enum {
 	MLXSW_EMAD_TLV_TYPE_OP,
 	MLXSW_EMAD_TLV_TYPE_STRING,
 	MLXSW_EMAD_TLV_TYPE_REG,
+	MLXSW_EMAD_TLV_TYPE_LATENCY,
 };
 
 /* OP TLV */
@@ -90,6 +91,9 @@ enum {
 /* STRING TLV */
 #define MLXSW_EMAD_STRING_TLV_LEN 33	/* Length in u32 */
 
+/* LATENCY TLV */
+#define MLXSW_EMAD_LATENCY_TLV_LEN 7	/* Length in u32 */
+
 /* END TLV */
 #define MLXSW_EMAD_END_TLV_LEN 1	/* Length in u32 */