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From: Jiri Pirko <jiri@resnulli.us>
To: Jacob Keller <jacob.e.keller@intel.com>
Cc: netdev@vger.kernel.org, Jakub Kicinski <kuba@kernel.org>
Subject: Re: [net-next v2 07/11] devlink: report error once U32_MAX snapshot ids have been used
Date: Thu, 26 Mar 2020 08:30:47 +0100	[thread overview]
Message-ID: <20200326073047.GJ11304@nanopsycho.orion> (raw)
In-Reply-To: <20200326035157.2211090-8-jacob.e.keller@intel.com>

Thu, Mar 26, 2020 at 04:51:53AM CET, jacob.e.keller@intel.com wrote:
>The devlink_snapshot_id_get() function returns a snapshot id. The
>snapshot id is a u32, so there is no way to indicate an error code.
>
>Indeed, the two current callers of devlink_snapshot_id_get() assume that
>a negative value is an error.

I don't see they do.


>
>A future change is going to possibly add additional cases where this
>function could fail. Refactor the function to return the snapshot id in
>an argument, so that it can return zero or an error value.
>
>This ensures that snapshot ids cannot be confused with error values, and
>aids in the future refactor of snapshot id allocation management.
>
>Because there is no current way to release previously used snapshot ids,
>add a simple check ensuring that an error is reported in case the
>snapshot_id would over flow.
>
>Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>

The code looks good.

Reviewed-by: Jiri Pirko <jiri@mellanox.com>

  reply	other threads:[~2020-03-26  7:30 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-26  3:51 [net-next v2 00/11] implement DEVLINK_CMD_REGION_NEW Jacob Keller
2020-03-26  3:51 ` [net-next v2 01/11] devlink: prepare to support region operations Jacob Keller
2020-03-26  3:51 ` [net-next v2 02/11] devlink: convert snapshot destructor callback to region op Jacob Keller
2020-03-26  3:51 ` [net-next v2 03/11] devlink: trivial: fix tab in function documentation Jacob Keller
2020-03-26  3:51 ` [net-next v2 04/11] devlink: add function to take snapshot while locked Jacob Keller
2020-03-26  3:51 ` [net-next v2 05/11] devlink: use -ENOSPC to indicate no more room for snapshots Jacob Keller
2020-03-26  7:24   ` Jiri Pirko
2020-03-26  3:51 ` [net-next v2 06/11] devlink: extract snapshot id allocation to helper function Jacob Keller
2020-03-26  7:25   ` Jiri Pirko
2020-03-26  3:51 ` [net-next v2 07/11] devlink: report error once U32_MAX snapshot ids have been used Jacob Keller
2020-03-26  7:30   ` Jiri Pirko [this message]
2020-03-26 16:09     ` Keller, Jacob E
2020-03-26  3:51 ` [net-next v2 08/11] devlink: track snapshot id usage count using an xarray Jacob Keller
2020-03-26  8:35   ` Jiri Pirko
2020-03-26  3:51 ` [net-next v2 09/11] devlink: implement DEVLINK_CMD_REGION_NEW Jacob Keller
2020-03-26  8:51   ` Jiri Pirko
2020-03-26  8:52   ` Jiri Pirko
2020-03-26 16:19     ` Jacob Keller
2020-03-26 21:10       ` Jiri Pirko
2020-03-26  3:51 ` [net-next v2 10/11] netdevsim: support taking immediate snapshot via devlink Jacob Keller
2020-03-26  9:00   ` Jiri Pirko
2020-03-26  3:51 ` [net-next v2 11/11] ice: add a devlink region for dumping NVM contents Jacob Keller
2020-03-26  9:02   ` Jiri Pirko
2020-03-26 16:23     ` Jacob Keller
2020-03-26 21:11       ` Jiri Pirko
2020-03-26  7:23 ` [net-next v2 00/11] implement DEVLINK_CMD_REGION_NEW Jiri Pirko
2020-03-26  7:51 ` Jiri Pirko
2020-03-26 16:15   ` Jacob Keller
2020-03-26 21:12     ` Jiri Pirko
2020-03-26  8:36 ` Jiri Pirko
2020-03-26  8:54 ` Jiri Pirko
2020-03-26 18:27 ` David Miller
2020-03-26 18:29   ` Jacob Keller

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