devlink: Add health buffer support

Devlink health buffer is a mechanism to pass descriptors between drivers
and devlink. The API allows the driver to add objects, object pair,
value array (nested attributes), value and name.

Driver can use this API to fill the buffers in a format which can be
translated by the devlink to the netlink message.

In order to fulfill it, an internal buffer descriptor is defined. This
will hold the data and metadata per each attribute and by used to pass
actual commands to the netlink.

This mechanism will be later used in devlink health for dump and diagnose
data store by the drivers.

Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Reviewed-by: Moshe Shemesh <moshe@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 0 deletions

diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
index 6e52d3660654..cff0e0cb5ac2 100644
--- a/include/uapi/linux/devlink.h
+++ b/include/uapi/linux/devlink.h
@@ -285,6 +285,14 @@ enum devlink_attr {
         DEVLINK_ATTR_REGION_CHUNK_ADDR,         /* u64 */
         DEVLINK_ATTR_REGION_CHUNK_LEN,          /* u64 */
 
+        DEVLINK_ATTR_HEALTH_BUFFER_OBJECT,              /* nested */
+        DEVLINK_ATTR_HEALTH_BUFFER_OBJECT_PAIR,         /* nested */
+        DEVLINK_ATTR_HEALTH_BUFFER_OBJECT_NAME,         /* string */
+        DEVLINK_ATTR_HEALTH_BUFFER_OBJECT_VALUE,        /* nested */
+        DEVLINK_ATTR_HEALTH_BUFFER_OBJECT_VALUE_ARRAY,  /* nested */
+        DEVLINK_ATTR_HEALTH_BUFFER_OBJECT_VALUE_TYPE,   /* u8 */
+        DEVLINK_ATTR_HEALTH_BUFFER_OBJECT_VALUE_DATA,   /* dynamic */
+
         /* add new attributes above here, update the policy in devlink.c */
 
         __DEVLINK_ATTR_MAX,