devlink: Introduce PCI VF port flavour and port attribute

In an eswitch, PCI VF may have port which is normally represented using
a representor netdevice.
To have better visibility of eswitch port, its association with VF,
and its representor netdevice, introduce a PCI VF port flavour.

When devlink port flavour is PCI VF, fill up PCI VF attributes of
the port.

Extend port name creation using PCI PF and VF number scheme on best
effort basis, so that vendor drivers can skip defining their own scheme.

$ devlink port show
pci/0000:05:00.0/0: type eth netdev eth0 flavour pcipf pfnum 0
pci/0000:05:00.0/1: type eth netdev eth1 flavour pcivf pfnum 0 vfnum 0
pci/0000:05:00.0/2: type eth netdev eth2 flavour pcivf pfnum 0 vfnum 1

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

1 files changed, 6 insertions, 0 deletions

diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
index f7323884c3fe..ffc993256527 100644
--- a/include/uapi/linux/devlink.h
+++ b/include/uapi/linux/devlink.h
@@ -173,6 +173,10 @@ enum devlink_port_flavour {
                                       * the PCI PF. It is an internal
                                       * port that faces the PCI PF.
                                       */
+        DEVLINK_PORT_FLAVOUR_PCI_VF, /* Represents eswitch port
+                                      * for the PCI VF. It is an internal
+                                      * port that faces the PCI VF.
+                                      */
 };
 
 enum devlink_param_cmode {
@@ -342,6 +346,8 @@ enum devlink_attr {
         DEVLINK_ATTR_FLASH_UPDATE_STATUS_TOTAL, /* u64 */
 
         DEVLINK_ATTR_PORT_PCI_PF_NUMBER,        /* u16 */
+        DEVLINK_ATTR_PORT_PCI_VF_NUMBER,        /* u16 */
+
         /* add new attributes above here, update the policy in devlink.c */
 
         __DEVLINK_ATTR_MAX,