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

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Date:   Tue, 4 Aug 2020 21:42:06 +0300
From:   Ilia Lin <ilia.lin@...nel.org>
To:     David Miller <davem@...emloft.net>
Cc:     andrew@...n.ch, 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

Hi Andrew and David,

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.

Here is the register_netdev call:
https://source.codeaurora.org/quic/la/kernel/msm-4.19/tree/drivers/platform/msm/ipa/ipa_v3/rmnet_ipa.c#n2497

And it is going to be in the subsys_initcall as well.

Thanks,
Ilia

On Mon, Jul 27, 2020 at 8:32 PM David Miller <davem@...emloft.net> wrote:
>
> From: Andrew Lunn <andrew@...n.ch>
> Date: Sun, 26 Jul 2020 21:45:28 +0200
>
> > I also have to wonder why a network device driver is being probed the
> > subsys_initcall.
>
> This makes me wonder how this interface could even be useful.  The
> only way to fix the problem is to change when the device is probed,
> which would mean changing which initcall it uses.  So at run time,
> this information can't do much.