linux-kernel - Re: [PATCH] mptcp: MPTCP_IPV6 should depend on IPV6 instead of selecting it

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Message-ID: <f414539c-1370-1636-137e-38c735f449f6@tessares.net>
Date:   Wed, 21 Oct 2020 12:54:11 +0200
From:   Matthieu Baerts <matthieu.baerts@...sares.net>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        "David S . Miller" <davem@...emloft.net>,
        Florian Westphal <fw@...len.de>,
        netdev <netdev@...r.kernel.org>, mptcp@...ts.01.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mptcp: MPTCP_IPV6 should depend on IPV6 instead of
 selecting it

Hi Geert,

On 21/10/2020 11:52, Geert Uytterhoeven wrote:
> Hi Matthieu,
> 
> On Wed, Oct 21, 2020 at 11:47 AM Matthieu Baerts
> <matthieu.baerts@...sares.net> wrote:
>> On 21/10/2020 11:43, Geert Uytterhoeven wrote:
>>> On Wed, Oct 21, 2020 at 5:56 AM Jakub Kicinski <kuba@...nel.org> wrote:
>>>> On Tue, 20 Oct 2020 11:26:34 +0200 Matthieu Baerts wrote:
>>>>> On 20/10/2020 09:38, Geert Uytterhoeven wrote:
>>>>>> MPTCP_IPV6 selects IPV6, thus enabling an optional feature the user may
>>>>>> not want to enable.  Fix this by making MPTCP_IPV6 depend on IPV6, like
>>>>>> is done for all other IPv6 features.
>>>>>
>>>>> Here again, the intension was to select IPv6 from MPTCP but I understand
>>>>> the issue: if we enable MPTCP, we will select IPV6 as well by default.
>>>>> Maybe not what we want on some embedded devices with very limited memory
>>>>> where IPV6 is already off. We should instead enable MPTCP_IPV6 only if
>>>>> IPV6=y. LGTM then!
>>>>>
>>>>> Reviewed-by: Matthieu Baerts <matthieu.baerts@...sares.net>
>>>>
>>>> Applied, thanks!
>>>
>>> My apologies, this fails for the CONFIG_IPV6=m and CONFIG_MPTCP=y
>>> case:
>>
>> Good point, MPTCP cannot be compiled as a module (like TCP). It should
>> then depends on IPV6=y. I thought it would be the case.
>>
>> Do you want me to send a patch or do you already have one?
> 
> I don't have a patch yet, so feel free to send one.

Just did:

https://lore.kernel.org/netdev/20201021105154.628257-1-matthieu.baerts@tessares.net/

Groetjes,
Matt
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