Date:   Thu, 26 Mar 2020 08:51:01 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jacob Keller <jacob.e.keller@...el.com>
Cc:     netdev@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>
Subject: Re: [net-next v2 00/11] implement DEVLINK_CMD_REGION_NEW

Thu, Mar 26, 2020 at 04:51:46AM CET, jacob.e.keller@...el.com wrote:
>This is a second revision of the previous series to implement the
>DEVLINK_CMD_REGION_NEW. The series can be viewed on lore.kernel.org at
>
>https://lore.kernel.org/netdev/20200324223445.2077900-1-jacob.e.keller@intel.com/
>
>This version includes the suggested cleanups from Jakub and Jiri on the
>list, including the following changes, broken out by the v1 patch title.
>
>Changes to patches since v1:
>
> * devlink: prepare to support region operations
>
>   No changes
>
> * devlink: convert snapshot destructor callback to region op
>
>   No changes
>
> * devlink: trivial: fix tab in function documentation
>
>   No changes
>
> * devlink: add function to take snapshot while locked
>
>   Added Jakub's Reviewed-by tag.
>
> * <NEW> devlink: use -ENOSPC to indicate no more room for snapshots
>
>   New patch added to convert confusing -ENOMEM to -ENOSPC, as suggested by
>   Jiri.
>
> * devlink: extract snapshot id allocation to helper function
>
>   No changes
>
> * devlink: convert snapshot id getter to return an error
>
>   Changed title to "devlink: report error once U32_MAX snapshot ids have
>   been used".
>
>   Refactored this patch to make devlink_region_snapshot_id_get take a
>   pointer to u32, so that the error value and id value are separated. This
>   means that we can remove the INT_MAX limitation on id values.
>
> * devlink: track snapshot id usage count using an xarray
>
>   Fixed the xa_init to use xa_init_flags with XA_FLAGS_ALLOC, so that
>   xa_alloc can properly be used.
>
>   Changed devlink_region_snapshot_id_get to use an initial count of 1
>   instead of 0. Added a new devlink_region_snapshot_id_put function, used
>   to release this initial count. This closes the race condition and issues
>   caused if the driver either doesn't create a snapshot, or if userspace
>   deletes the first snapshot before others are created.
>
>   Used WARN_ON in a few more checks that should not occur, such as if the
>   xarray entry is not a value, or when the id isn't yet in the xarray.
>
>   Removed an unnecessary if (err) { return err; } construction.
>
>   Use xa_limit_32b instead of xa_limit_31b now that we don't return the
>   snapshot id directly.
>
>   Cleanup the label used in __devlink_region_snapshot_create to indicate the
>   failure cause, rather than the cleanup step.
>
>   Removed the unnecessary locking around xa_destroy
>
> * devlink: implement DEVLINK_CMD_REGION_NEW
>
>   Added a WARN_ON to the check in snapshot_id_insert in case the id already
>   exists.
>
>   Removed an unnecessary "if (err) { return err; }" construction
>
>   Use -ENOSPC instead of -ENOMEM when max_snapshots is reached.
>
>   Cleanup label names to match style of the other labels in the file,
>   naming after the failure cause rather than the cleanup step. Also fix a
>   bug in the label ordering.
>
>   Call the new devlink_region_snapshot_id_put function in the mlx4 and
>   netdevsim drivers.
>
> * netdevsim: support taking immediate snapshot via devlink
>
>   Create a local devlink pointer instead of calling priv_to_devlink
>   multiple times.
>
>   Removed previous selftest for devlink region new without a snapshot id,
>   as this is no longer supported. Adjusted and verified that the tests pass
>   now.
>
> * ice: add a devlink region for dumping NVM contents
>
>   Use "dev_err" instead of "dev_warn" for a message about failure to create
>   the devlink region.

Could you please have the changelog per-patch, as I suggested for v1?
Much easier to review then.

Also, please omit the "no changes" notes.


>
>Jacob Keller (11):
>  devlink: prepare to support region operations
>  devlink: convert snapshot destructor callback to region op
>  devlink: trivial: fix tab in function documentation
>  devlink: add function to take snapshot while locked
>  devlink: use -ENOSPC to indicate no more room for snapshots
>  devlink: extract snapshot id allocation to helper function
>  devlink: report error once U32_MAX snapshot ids have been used
>  devlink: track snapshot id usage count using an xarray
>  devlink: implement DEVLINK_CMD_REGION_NEW
>  netdevsim: support taking immediate snapshot via devlink
>  ice: add a devlink region for dumping NVM contents
>
> .../networking/devlink/devlink-region.rst     |   8 +
> Documentation/networking/devlink/ice.rst      |  26 ++
> drivers/net/ethernet/intel/ice/ice.h          |   2 +
> drivers/net/ethernet/intel/ice/ice_devlink.c  |  99 +++++
> drivers/net/ethernet/intel/ice/ice_devlink.h  |   3 +
> drivers/net/ethernet/intel/ice/ice_main.c     |   4 +
> drivers/net/ethernet/mellanox/mlx4/crdump.c   |  36 +-
> drivers/net/netdevsim/dev.c                   |  46 ++-
> include/net/devlink.h                         |  33 +-
> net/core/devlink.c                            | 363 +++++++++++++++---
> .../drivers/net/netdevsim/devlink.sh          |  10 +
> 11 files changed, 550 insertions(+), 80 deletions(-)
>
>-- 
>2.24.1
>

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