netdev - Re: [PATCH net-next v4] net: psample: Introduce stubs to remove NIC driver dependency

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Message-ID: <20210201180837.GB3456040@shredder.lan>
Date:   Mon, 1 Feb 2021 20:08:37 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     Chris Mi <cmi@...dia.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        jiri@...dia.com, Saeed Mahameed <saeedm@...dia.com>,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH net-next v4] net: psample: Introduce stubs to remove NIC
 driver dependency

On Mon, Feb 01, 2021 at 09:37:11AM +0800, Chris Mi wrote:
> Hi Ido,
> 
> On 1/30/2021 10:42 PM, Ido Schimmel wrote:
> > On Fri, Jan 29, 2021 at 12:30:09PM -0800, Jakub Kicinski wrote:
> > > On Fri, 29 Jan 2021 14:08:39 +0800 Chris Mi wrote:
> > > > Instead of discussing it several days, maybe it's better to review
> > > > current patch, so that we can move forward :)
> > > It took you 4 revisions to post a patch which builds cleanly and now
> > > you want to hasten the review? My favorite kind of submission.
> > > 
> > > The mlxsw core + spectrum drivers are 65 times the size of psample
> > > on my system. Why is the dependency a problem?
> > mlxsw has been using psample for ~4 years and I don't remember seeing a
> > single complaint about the dependency. I don't understand why this patch
> > is needed.
> Please see Saeed's comment in previous email:
> 
> "
> 
> The issue is with distros who ship modules independently.. having a
> hard dependency will make it impossible for basic mlx5_core.ko users to
> load the driver when psample is not installed/loaded.
> 
> I prefer to have 0 dependency on external modules in a HW driver.
> "

I saw it, but it basically comes down to personal preferences.

> 
> We are working on a tc sample offload feature for mlx5_core. The distros
> are likely to request us to do this. So we address it before submitting
> the driver changes.

Which distros? Can they comment here? mlxsw is in RHEL and I don't
remember queries from them about the psample module.

> 
> Regards,
> Chris
>