devlink: Add a new devlink port split ability attribute and pass to netlink

Add a new attribute that indicates the split ability of 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>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.c b/drivers/net/ethernet/mellanox/mlxsw/core.c
index f85f5d8..8b3791d 100644 (file)
--- 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 71f4e62..b6a1056 100644 (file)
--- 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 91a9f87..746bed5 100644 (file)
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -68,11 +68,13 @@ struct devlink_port_pci_vf_attrs {
  * struct devlink_port_attrs - devlink port object
  * @flavour: flavour of the port
  * @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.
  * @switch_id: if the port is part of switch, this is buffer with ID, otherwise this is NULL
  */
 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 f741ab8..cfef424 100644 (file)
--- a/include/uapi/linux/devlink.h
+++ b/include/uapi/linux/devlink.h
@@ -456,6 +456,7 @@ enum devlink_attr {
        DEVLINK_ATTR_INFO_BOARD_SERIAL_NUMBER,  /* string */
 
        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 7f26d10..94c797b 100644 (file)
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -534,6 +534,8 @@ 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) {
@@ -7547,6 +7549,7 @@ void devlink_port_attrs_set(struct devlink_port *devlink_port,
        ret = __devlink_port_attrs_set(devlink_port, attrs->flavour);
        if (ret)
                return;
+       WARN_ON(attrs->splittable && attrs->split);
 }
 EXPORT_SYMBOL_GPL(devlink_port_attrs_set);