devlink: extend attrs_set for setting port flavours

Devlink ports can have specific flavour according to the purpose of use.
This patch extend attrs_set so the driver can say which flavour port
has. Initial flavours are:
physical, cpu, dsa
User can query this to see right away what is the purpose of each port.
Signed-off-by: NJiri Pirko <jiri@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

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

@@ -1722,8 +1722,8 @@ void mlxsw_core_port_eth_set(struct mlxsw_core *mlxsw_core, u8 local_port,
 	struct devlink_port *devlink_port = &mlxsw_core_port->devlink_port;
 
 	mlxsw_core_port->port_driver_priv = port_driver_priv;
-	devlink_port_attrs_set(devlink_port, port_number,
-			       split, split_port_subnumber);
+	devlink_port_attrs_set(devlink_port, DEVLINK_PORT_FLAVOUR_PHYSICAL,
+			       port_number, split, split_port_subnumber);
 	devlink_port_type_eth_set(devlink_port, dev);
 }
 EXPORT_SYMBOL(mlxsw_core_port_eth_set);

drivers/net/ethernet/netronome/nfp/nfp_devlink.c

@@ -175,8 +175,9 @@ int nfp_devlink_port_register(struct nfp_app *app, struct nfp_port *port)
 		return ret;
 
 	devlink_port_type_eth_set(&port->dl_port, port->netdev);
-	devlink_port_attrs_set(&port->dl_port, eth_port.label_port,
-			       eth_port.is_split, eth_port.label_subport);
+	devlink_port_attrs_set(&port->dl_port, DEVLINK_PORT_FLAVOUR_PHYSICAL,
+			       eth_port.label_port, eth_port.is_split,
+			       eth_port.label_subport);
 
 	devlink = priv_to_devlink(app->pf);
 

include/net/devlink.h

@@ -37,6 +37,7 @@ struct devlink {
 
 struct devlink_port_attrs {
 	bool set;
+	enum devlink_port_flavour flavour;
 	u32 port_number; /* same value as "split group" */
 	bool split;
 	u32 split_subport_number;
@@ -374,6 +375,7 @@ void devlink_port_type_ib_set(struct devlink_port *devlink_port,
 			      struct ib_device *ibdev);
 void devlink_port_type_clear(struct devlink_port *devlink_port);
 void devlink_port_attrs_set(struct devlink_port *devlink_port,
+			    enum devlink_port_flavour flavour,
 			    u32 port_number, bool split,
 			    u32 split_subport_number);
 int devlink_sb_register(struct devlink *devlink, unsigned int sb_index,
@@ -474,6 +476,7 @@ static inline void devlink_port_type_clear(struct devlink_port *devlink_port)
 }
 
 static inline void devlink_port_attrs_set(struct devlink_port *devlink_port,
+					  enum devlink_port_flavour flavour,
 					  u32 port_number, bool split,
 					  u32 split_subport_number)
 {

include/uapi/linux/devlink.h

@@ -132,6 +132,16 @@ enum devlink_eswitch_encap_mode {
 	DEVLINK_ESWITCH_ENCAP_MODE_BASIC,
 };
 
+enum devlink_port_flavour {
+	DEVLINK_PORT_FLAVOUR_PHYSICAL, /* Any kind of a port physically
+					* facing the user.
+					*/
+	DEVLINK_PORT_FLAVOUR_CPU, /* CPU port */
+	DEVLINK_PORT_FLAVOUR_DSA, /* Distributed switch architecture
+				   * interconnect port.
+				   */
+};
+
 enum devlink_attr {
 	/* don't change the order or add anything between, this is ABI! */
 	DEVLINK_ATTR_UNSPEC,
@@ -224,6 +234,7 @@ enum devlink_attr {
 	DEVLINK_ATTR_DPIPE_TABLE_RESOURCE_ID,	/* u64 */
 	DEVLINK_ATTR_DPIPE_TABLE_RESOURCE_UNITS,/* u64 */
 
+	DEVLINK_ATTR_PORT_FLAVOUR,		/* u16 */
 	DEVLINK_ATTR_PORT_NUMBER,		/* u32 */
 	DEVLINK_ATTR_PORT_SPLIT_SUBPORT_NUMBER,	/* u32 */
 

net/core/devlink.c

@@ -460,6 +460,8 @@ static int devlink_nl_port_attrs_put(struct sk_buff *msg,
 
 	if (!attrs->set)
 		return 0;
+	if (nla_put_u16(msg, DEVLINK_ATTR_PORT_FLAVOUR, attrs->flavour))
+		return -EMSGSIZE;
 	if (nla_put_u32(msg, DEVLINK_ATTR_PORT_NUMBER, attrs->port_number))
 		return -EMSGSIZE;
 	if (!attrs->split)
@@ -2991,6 +2993,7 @@ EXPORT_SYMBOL_GPL(devlink_port_type_clear);
  *	devlink_port_attrs_set - Set port attributes
  *
  *	@devlink_port: devlink port
+ *	@flavour: flavour of the port
  *	@port_number: number of the port that is facing user, for example
  *	              the front panel port number
  *	@split: indicates if this is split port
@@ -2998,12 +3001,14 @@ EXPORT_SYMBOL_GPL(devlink_port_type_clear);
  *	                       of subport.
  */
 void devlink_port_attrs_set(struct devlink_port *devlink_port,
+			    enum devlink_port_flavour flavour,
 			    u32 port_number, bool split,
 			    u32 split_subport_number)
 {
 	struct devlink_port_attrs *attrs = &devlink_port->attrs;
 
 	attrs->set = true;
+	attrs->flavour = flavour;
 	attrs->port_number = port_number;
 	attrs->split = split;
 	attrs->split_subport_number = split_subport_number;