[iproute2-next v3 0/3] devlink: support dry run attribute for flash update

[Jacob Keller <jacob.e.keller@intel.com>]

Allow users to request a dry run of a flash update by adding the
DEVLINK_ATTR_DRY_RUN.

Because many devlink commands do not validate and reject unknown attributes,
this could have unexpected side effects on older kernels which lack the
attribute. To handle this, check the socket and determine the maximum
attribute the kernel supports. Only allow passing the DEVLINK_ATTR_DRY_RUN
for kernels which have the attribute.

This allows a user to validate that a flash update will be accepted by the
driver and device without being forced to commit to updating.

Changes since v1
* Add Cc for maintainers
* Make dl_kernel_supports_dry_run more generic

Changes since v2
* Remove unnecessary () with return
* Reduce indentation of dl_get_max_attr

Cc: Jacob Keller <jacob.e.keller@intel.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Jiri Pirko <jiri@nvidia.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Tony Nguyen <anthony.l.nguyen@intel.com>
Cc: David Ahern <dsahern@kernel.org>
Cc: Stephen Hemminger <stephen@networkplumber.org>
Cc: linux-doc@vger.kernel.org
Cc: netdev@vger.kernel.org

Jacob Keller (3):
  update <linux/devlink.h> UAPI header
  mnlg: add function to get CTRL_ATTR_MAXATTR value
  devlink: add dry run attribute support to devlink flash

 devlink/devlink.c            | 46 +++++++++++++++++++++++++++--
 devlink/mnlg.c               | 56 ++++++++++++++++++++++++++++++++++++
 devlink/mnlg.h               |  1 +
 include/uapi/linux/devlink.h |  8 ++++++
 4 files changed, 109 insertions(+), 2 deletions(-)


base-commit: 4cb0bec3744ac4f8d21de0e769f170e4059c6b9e
-- 
2.35.1.456.ga9c7032d4631