linux-kernel - Re: [PATCH] net: dev: Add API to check net

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Date:   Wed, 5 Aug 2020 13:31:08 +0300
From:   Ilia Lin <ilia.lin@...nel.org>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     David Miller <davem@...emloft.net>, ilial@...eaurora.org,
        kuba@...nel.org, jiri@...lanox.com, edumazet@...gle.com,
        ap420073@...il.com, xiyou.wangcong@...il.com, maximmi@...lanox.com,
        Ilia Lin <ilia.lin@...nel.org>, netdev@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: dev: Add API to check net_dev readiness

My comments inline.

Thanks,
Ilia Lin

On Tue, Aug 4, 2020 at 10:24 PM Andrew Lunn <andrew@...n.ch> wrote:
>
> On Tue, Aug 04, 2020 at 08:47:18PM +0300, Ilia Lin wrote:
> > Hi Andrew and David,
>
> Hi Ilia
>
> Please don't top post.
>
> >
> > Thank you for your comments!
> >
> > The client driver is still work in progress, but it can be seen here:
> > https://source.codeaurora.org/quic/la/kernel/msm-4.19/tree/drivers/platform/msm/ipa/ipa_api.c#n3842
> >
> > For HW performance reasons, it has to be in subsys_initcall.
>
> Well, until the user of this new API is ready, we will not accept the
> patch.
OK, but once we submit the change in the driver, is it good to go?
>
> You also need to explain "For HW performance reasons". Why is this
> driver special that it can do things which no over driver does?
There are very strict KPI requirements. E.g. automotive rear mirror
must be online 3 sec since boot.
>
> And you should really be working on net-next, not this dead kernel
> version, if you want to get merged into mainline.
Of course, the upstream submition will be done on the mainline. I just
gave an example of an existing product driver.
>
> Network drivers do not belong is drivers/platform. There is also ready
> a drivers/net/ipa, so i assume you will move there.
Sure, the driver in the drivers/net/ipa is the one that will be
updated in the future.
>
>   Andrew