netdev - Re: [PATCH net-next 06/10] net: iosm: drop custom netdev(s) removing

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Date:   Tue, 29 Jun 2021 17:29:10 +0200
From:   Loic Poulain <loic.poulain@...aro.org>
To:     "Kumar, M Chetan" <m.chetan.kumar@...el.com>
Cc:     Sergey Ryazanov <ryazanov.s.a@...il.com>,
        Johannes Berg <johannes@...solutions.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        linuxwwan <linuxwwan@...el.com>
Subject: Re: [PATCH net-next 06/10] net: iosm: drop custom netdev(s) removing

Hi Chetan,

On Tue, 29 Jun 2021 at 16:56, Kumar, M Chetan <m.chetan.kumar@...el.com> wrote:
>
> Hi Loic,
>
> On 6/29/2021 7:44 PM, Loic Poulain wrote:
>
> >>> BTW, if IOSM modems have a default data channel, I can add a separate
> >>> patch to the series to create a default network interface for IOSM if you tell
> >>> me which link id is used for the default data channel.
> >>
> >> Link id 1 is always associated as default data channel.
> >
> > Quick question, Isn't your driver use MBIM session IDs? with
> > session-ID 0 as the default one?
>
> Link Id from 1 to 8 are treated as valid link ids. These ids are
> decremented by 1 to match session id.
>
> In this case link id 1 would be mapped to session id 0. So have
> requested link id 1 to be set as default data channel.

Oh ok, but why? it seems quite confusing, that means a user creating a
MBIM session 0 has to create a link with ID 1?
It seems to be quite specific to your driver, can't you simply handle
ID 0 from user? to keep aligned with other drivers.

Regards,
Loic