devlink: add device information API

ethtool -i has served us well for a long time, but its showing
its limitations more and more. The device information should
also be reported per device not per-netdev.

Lay foundation for a simple devlink-based way of reading device
info. Add driver name and device serial number as initial pieces
of information exposed via this new API.

v3:
 - rename helpers (Jiri);
 - rename driver name attr (Jiri);
 - remove double spacing in commit message (Jiri).
RFC v2:
 - wrap the skb into an opaque structure (Jiri);
 - allow the serial number of be any length (Jiri & Andrew);
 - add driver name (Jonathan).

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/uapi/linux/devlink.h b/include/uapi/linux/devlink.h
index 61b4447a6c5b..142710d45093 100644
--- a/include/uapi/linux/devlink.h
+++ b/include/uapi/linux/devlink.h
@@ -94,6 +94,8 @@ enum devlink_command {
         DEVLINK_CMD_PORT_PARAM_NEW,
         DEVLINK_CMD_PORT_PARAM_DEL,
 
+        DEVLINK_CMD_INFO_GET,           /* can dump */
+
         /* add new commands above here */
         __DEVLINK_CMD_MAX,
         DEVLINK_CMD_MAX = __DEVLINK_CMD_MAX - 1
@@ -290,6 +292,9 @@ enum devlink_attr {
         DEVLINK_ATTR_REGION_CHUNK_ADDR,         /* u64 */
         DEVLINK_ATTR_REGION_CHUNK_LEN,          /* u64 */
 
+        DEVLINK_ATTR_INFO_DRIVER_NAME,          /* string */
+        DEVLINK_ATTR_INFO_SERIAL_NUMBER,        /* string */
+
         /* add new attributes above here, update the policy in devlink.c */
 
         __DEVLINK_ATTR_MAX,