[RFC PATCH net-next 7/8] devlink: Add a new devlink port split ability attribute and pass to netlink

[Danielle Ratson <danieller@mellanox.com>]

Add a new attribute that indicates the split ability to devlink port.

Drivers are expected to set it via devlink_port_attrs_set(), before
registering the port.

Signed-off-by: Danielle Ratson <danieller@mellanox.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/core.c       | 1 +
 drivers/net/ethernet/netronome/nfp/nfp_devlink.c | 1 +
 include/net/devlink.h                            | 3 ++-
 include/uapi/linux/devlink.h                     | 1 +
 net/core/devlink.c                               | 3 +++
 5 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.c b/drivers/net/ethernet/mellanox/mlxsw/core.c
index f85f5d88d331..8b3791d73c99 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/core.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/core.c
@@ -2135,6 +2135,7 @@ static int __mlxsw_core_port_init(struct mlxsw_core *mlxsw_core, u8 local_port,
 
 	attrs.split = split;
 	attrs.lanes = lanes;
+	attrs.splittable = splittable;
 	attrs.flavour = flavour;
 	attrs.phys.port_number = port_number;
 	attrs.phys.split_subport_number = split_port_subnumber;
diff --git a/drivers/net/ethernet/netronome/nfp/nfp_devlink.c b/drivers/net/ethernet/netronome/nfp/nfp_devlink.c
index 71f4e624b3db..b6a10565309a 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_devlink.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_devlink.c
@@ -367,6 +367,7 @@ int nfp_devlink_port_register(struct nfp_app *app, struct nfp_port *port)
 		return ret;
 
 	attrs.split = eth_port.is_split;
+	attrs.splittable = !attrs.split;
 	attrs.flavour = DEVLINK_PORT_FLAVOUR_PHYSICAL;
 	attrs.phys.port_number = eth_port.label_port;
 	attrs.phys.split_subport_number = eth_port.label_subport;
diff --git a/include/net/devlink.h b/include/net/devlink.h
index ee088cead80a..3eb5fd41731f 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -65,7 +65,8 @@ struct devlink_port_pci_vf_attrs {
 };
 
 struct devlink_port_attrs {
-	u8 split:1;
+	u8 split:1,
+	   splittable:1;
 	u32 lanes;
 	enum devlink_port_flavour flavour;
 	struct netdev_phys_item_id switch_id;
diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
index 806c6a437fa2..22bd17ba8adb 100644
--- a/include/uapi/linux/devlink.h
+++ b/include/uapi/linux/devlink.h
@@ -452,6 +452,7 @@ enum devlink_attr {
 	DEVLINK_ATTR_TRAP_POLICER_BURST,		/* u64 */
 
 	DEVLINK_ATTR_PORT_LANES,			/* u32 */
+	DEVLINK_ATTR_PORT_SPLITTABLE,			/* u8 */
 
 	/* add new attributes above here, update the policy in devlink.c */
 
diff --git a/net/core/devlink.c b/net/core/devlink.c
index ce82629b7386..a47426941e21 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -530,6 +530,8 @@ static int devlink_nl_port_attrs_put(struct sk_buff *msg,
 		if (nla_put_u32(msg, DEVLINK_ATTR_PORT_LANES, attrs->lanes))
 			return -EMSGSIZE;
 	}
+	if (nla_put_u8(msg, DEVLINK_ATTR_PORT_SPLITTABLE, attrs->splittable))
+		return -EMSGSIZE;
 	if (nla_put_u16(msg, DEVLINK_ATTR_PORT_FLAVOUR, attrs->flavour))
 		return -EMSGSIZE;
 	switch (devlink_port->attrs.flavour) {
@@ -7409,6 +7411,7 @@ static int __devlink_port_attrs_set(struct devlink_port *devlink_port,
  *					   user, for example the front panel
  *			                   port number
  *			     @split: indicates if this is split port
+ *			     @splittable: indicates if the port can be split.
  *			     @lanes: maximum number of lanes the port supports.
  *				     0 value is not passed to netlink and valid
  *				     number is a power of 2.
-- 
2.20.1