devlink: Introduce devlink port flavour virtual

Currently mlx5 PCI PF and VF devlink devices register their ports as
physical port in non-representors mode.

Introduce a new port flavour as virtual so that virtual devices can
register 'virtual' flavour to make it more clear to users.

An example of one PCI PF and 2 PCI virtual functions, each having
one devlink port.

$ devlink port show
pci/0000:06:00.0/1: type eth netdev ens2f0 flavour physical port 0
pci/0000:06:00.2/1: type eth netdev ens2f2 flavour virtual port 0
pci/0000:06:00.3/1: type eth netdev ens2f3 flavour virtual port 0

Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Parav Pandit <parav@mellanox.com>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/uapi/linux/devlink.h

@@ -187,6 +187,7 @@ enum devlink_port_flavour {
 				      * for the PCI VF. It is an internal
 				      * port that faces the PCI VF.
 				      */
+	DEVLINK_PORT_FLAVOUR_VIRTUAL, /* Any virtual port facing the user. */
 };
 
 enum devlink_param_cmode {

net/core/devlink.c

@@ -545,6 +545,7 @@ static int devlink_nl_port_attrs_put(struct sk_buff *msg,
 	case DEVLINK_PORT_FLAVOUR_PHYSICAL:
 	case DEVLINK_PORT_FLAVOUR_CPU:
 	case DEVLINK_PORT_FLAVOUR_DSA:
+	case DEVLINK_PORT_FLAVOUR_VIRTUAL:
 		if (nla_put_u32(msg, DEVLINK_ATTR_PORT_NUMBER,
 				attrs->phys.port_number))
 			return -EMSGSIZE;
@@ -6806,6 +6807,7 @@ static int __devlink_port_phys_port_name_get(struct devlink_port *devlink_port,
 
 	switch (attrs->flavour) {
 	case DEVLINK_PORT_FLAVOUR_PHYSICAL:
+	case DEVLINK_PORT_FLAVOUR_VIRTUAL:
 		if (!attrs->split)
 			n = snprintf(name, len, "p%u", attrs->phys.port_number);
 		else