[patch iproute2-next 0/6] devlink: implement dump selector for devlink objects show commands

[Jiri Pirko <jiri@resnulli.us>]

From: Jiri Pirko <jiri@nvidia.com>

First 5 patches are preparations for the last one.

Motivation:

For SFs, one devlink instance per SF is created. There might be
thousands of these on a single host. When a user needs to know port
handle for specific SF, he needs to dump all devlink ports on the host
which does not scale good.

Solution:

Allow user to pass devlink handle (and possibly other attributes)
alongside the dump command and dump only objects which are matching
the selection.

Example:
$ devlink port show
auxiliary/mlx5_core.eth.0/65535: type eth netdev eth2 flavour physical port 0 splittable false
auxiliary/mlx5_core.eth.1/131071: type eth netdev eth3 flavour physical port 1 splittable false

$ devlink port show auxiliary/mlx5_core.eth.0
auxiliary/mlx5_core.eth.0/65535: type eth netdev eth2 flavour physical port 0 splittable false

$ devlink port show auxiliary/mlx5_core.eth.1
auxiliary/mlx5_core.eth.1/131071: type eth netdev eth3 flavour physical port 1 splittable false

Jiri Pirko (6):
  devlink: move DL_OPT_SB into required options
  devlink: make parsing of handle non-destructive to argv
  devlink: implement command line args dry parsing
  devlink: return -ENOENT if argument is missing
  mnl_utils: introduce a helper to check if dump policy exists for
    command
  devlink: implement dump selector for devlink objects show commands

 devlink/devlink.c   | 376 ++++++++++++++++++++++++++------------------
 include/mnl_utils.h |   1 +
 lib/mnl_utils.c     | 121 +++++++++++++-
 3 files changed, 342 insertions(+), 156 deletions(-)

-- 
2.41.0