[PATCH net-next 01/10] devlink: expose devlink instance index over netlink

[Jiri Pirko <jiri@resnulli.us>]

From: Jiri Pirko <jiri@nvidia.com>

Each devlink instance has an internally assigned index used for xarray
storage. Expose it as a new DEVLINK_ATTR_INDEX uint attribute alongside
the existing bus_name and dev_name handle.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
---
 Documentation/netlink/specs/devlink.yaml | 5 +++++
 include/uapi/linux/devlink.h             | 2 ++
 net/devlink/devl_internal.h              | 2 ++
 net/devlink/port.c                       | 1 +
 4 files changed, 10 insertions(+)

diff --git a/Documentation/netlink/specs/devlink.yaml b/Documentation/netlink/specs/devlink.yaml
index 837112da6738..1bed67a0eefb 100644
--- a/Documentation/netlink/specs/devlink.yaml
+++ b/Documentation/netlink/specs/devlink.yaml
@@ -867,6 +867,10 @@ attribute-sets:
         type: flag
         doc: Request restoring parameter to its default value.
         value: 183
+      -
+        name: index
+        type: uint
+        doc: Unique devlink instance index.
   -
     name: dl-dev-stats
     subset-of: devlink
@@ -1311,6 +1315,7 @@ operations:
           attributes:
             - bus-name
             - dev-name
+            - index
             - reload-failed
             - dev-stats
       dump:
diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
index e7d6b6d13470..1ba3436db4ae 100644
--- a/include/uapi/linux/devlink.h
+++ b/include/uapi/linux/devlink.h
@@ -642,6 +642,8 @@ enum devlink_attr {
 	DEVLINK_ATTR_PARAM_VALUE_DEFAULT,	/* dynamic */
 	DEVLINK_ATTR_PARAM_RESET_DEFAULT,	/* flag */
 
+	DEVLINK_ATTR_INDEX,			/* uint */
+
 	/* Add new attributes above here, update the spec in
 	 * Documentation/netlink/specs/devlink.yaml and re-generate
 	 * net/devlink/netlink_gen.c.
diff --git a/net/devlink/devl_internal.h b/net/devlink/devl_internal.h
index 1377864383bc..31fa98af418e 100644
--- a/net/devlink/devl_internal.h
+++ b/net/devlink/devl_internal.h
@@ -178,6 +178,8 @@ devlink_nl_put_handle(struct sk_buff *msg, struct devlink *devlink)
 		return -EMSGSIZE;
 	if (nla_put_string(msg, DEVLINK_ATTR_DEV_NAME, dev_name(devlink->dev)))
 		return -EMSGSIZE;
+	if (nla_put_uint(msg, DEVLINK_ATTR_INDEX, devlink->index))
+		return -EMSGSIZE;
 	return 0;
 }
 
diff --git a/net/devlink/port.c b/net/devlink/port.c
index 93d8a25bb920..1ff609571ea4 100644
--- a/net/devlink/port.c
+++ b/net/devlink/port.c
@@ -222,6 +222,7 @@ size_t devlink_nl_port_handle_size(struct devlink_port *devlink_port)
 
 	return nla_total_size(strlen(devlink->dev->bus->name) + 1) /* DEVLINK_ATTR_BUS_NAME */
 	     + nla_total_size(strlen(dev_name(devlink->dev)) + 1) /* DEVLINK_ATTR_DEV_NAME */
+	     + nla_total_size(8) /* DEVLINK_ATTR_INDEX */
 	     + nla_total_size(4); /* DEVLINK_ATTR_PORT_INDEX */
 }
 
-- 
2.51.1