net/devlink: Add E-Switch encapsulation control

This is an e-switch global knob to enable HW support for applying
encapsulation/decapsulation to VF traffic as part of SRIOV e-switch offloading.

The actual encap/decap is carried out (along with the matching and other actions)
per offloaded e-switch rules, e.g as done when offloading the TC tunnel key action.

Signed-off-by: Roi Dayan <roid@mellanox.com>
Reviewed-by: Or Gerlitz <ogerlitz@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

include/uapi/linux/devlink.h

@@ -119,6 +119,11 @@ enum devlink_eswitch_inline_mode {
 	DEVLINK_ESWITCH_INLINE_MODE_TRANSPORT,
 };
 
+enum devlink_eswitch_encap_mode {
+	DEVLINK_ESWITCH_ENCAP_MODE_NONE,
+	DEVLINK_ESWITCH_ENCAP_MODE_BASIC,
+};
+
 enum devlink_attr {
 	/* don't change the order or add anything between, this is ABI! */
 	DEVLINK_ATTR_UNSPEC,
@@ -195,6 +200,8 @@ enum devlink_attr {
 
 	DEVLINK_ATTR_PAD,
 
+	DEVLINK_ATTR_ESWITCH_ENCAP_MODE,	/* u8 */
+
 	/* add new attributes above here, update the policy in devlink.c */
 
 	__DEVLINK_ATTR_MAX,