netdev - Re: [PATCH net-next] Revert "netdevsim: Add multi-queue support"

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Message-ID: <20210803141839.79e99e23@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Tue, 3 Aug 2021 14:18:39 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     David Miller <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        "Cong Wang ." <cong.wang@...edance.com>,
        Peilin Ye <peilin.ye@...edance.com>
Subject: Re: [PATCH net-next] Revert "netdevsim: Add multi-queue support"

On Tue, 3 Aug 2021 10:11:13 -0700 Cong Wang wrote:
> On Tue, Aug 3, 2021 at 5:39 AM Jakub Kicinski <kuba@...nel.org> wrote:
> >
> > This reverts commit d4861fc6be581561d6964700110a4dede54da6a6.
> >
> > netdevsim is for enabling upstream tests, two weeks in
> > and there's no sign of upstream test using the "mutli-queue"
> > option.  
> 
> Since when netdevsim is *only* for upstream tests?

Since it was created.

> Even if so, where is this documented? And why not just point it 
> out when reviewing it instead of silently waiting for weeks?

I was AFK for the last two weeks.

> > We can add this option back when such test materializes.
> > Right now it's dead code.  
> 
> It is clearly not dead. We internally used it for testing sch_mq,
> this is clearly stated in the git log.

Please contribute those tests upstream or keep any test harness 
they require where such test are, out of tree.

> How did you draw such a conclusion without talking to authors?

There is no upstream test using this code, and I did CC you, didn't I?

> But this does remind me of using netdevsim for tc-testing.

Please bring the code back as part of the series adding upstream tests.

Thank you.