netdev - Re: [PATCH net] netdevsim: Restore per-network namespace accounting for fib entries

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Date:   Wed, 7 Aug 2019 13:31:58 -0600
From:   David Ahern <dsahern@...il.com>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        David Ahern <dsahern@...nel.org>, davem@...emloft.net,
        netdev@...r.kernel.org
Subject: Re: [PATCH net] netdevsim: Restore per-network namespace accounting
 for fib entries

On 8/7/19 7:07 AM, Jiri Pirko wrote:
> 
> Yeah. I believe it was a mistake to add it in the first place. Abuses
> netdevsim for something it is not. I'm fine to use devlink the way you
> want to after we conclude 2), but outside netdevsim.
> 
> Again, netdevsim is there for config api testing purposes. If things
> got broken, it is not that bit deal. I broke the way it is
> instantiated significantly for example (iplink->sysfs).
>

netdevsim was created as a way of testing hardware focused kernel APIs
and code paths without hardware. yes?

The devlink api was added to netdevsim to test fib notifiers failing by
handlers. The notifiers were added for mlxsw - a hardware driver - as a
way to get notifications of fib changes.

The easiest way to test the error paths was to code limits to fib
entries very similar to what mlxsw implements with its 'devlink
resource' implementation. ie., to implement 'devlink resource' for a
software emulated device. netdevsim was the most logical place for it.

See the commit logs starting at:

commit b349e0b5ec5d7be57ac243fb08ae8b994c928165
Merge: 6e2135ce54b7 37923ed6b8ce
Author: David S. Miller <davem@...emloft.net>
Date:   Thu Mar 29 14:10:31 2018 -0400

    Merge branch 'net-Allow-FIB-notifiers-to-fail-add-and-replace'

    David Ahern says:

    ====================
    net: Allow FIB notifiers to fail add and replace

Everything about that implementation is using the s/w device to test
code paths targeted at hardware offloads.