netdev - Re: [PATCH net 1/2] mpls: Make MPLS_IPTUNNEL select NET_MPLS

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Date:   Fri, 23 Oct 2020 20:48:16 +0200
From:   Guillaume Nault <gnault@...hat.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
        Alexander Ovechkin <ovov@...dex-team.ru>,
        David Ahern <dsahern@...il.com>
Subject: Re: [PATCH net 1/2] mpls: Make MPLS_IPTUNNEL select NET_MPLS_GSO

On Fri, Oct 23, 2020 at 11:23:04AM -0700, Jakub Kicinski wrote:
> On Fri, 23 Oct 2020 18:19:43 +0200 Guillaume Nault wrote:
> > Since commit b7c24497baea ("mpls: load mpls_gso after mpls_iptunnel"),
> > mpls_iptunnel.ko has a softdep on mpls_gso.ko. For this to work, we
> > need to ensure that mpls_gso.ko is built whenever MPLS_IPTUNNEL is set.
> 
> Does it generate an error or a warning? I don't know much about soft
> dependencies, but I'd think it's optional.

Yes, it's optional from a softdep point of view. My point was that
having a softdep isn't a complete solution, as a bad .config can still
result in inability to properly transmit GSO packets.

> > diff --git a/net/mpls/Kconfig b/net/mpls/Kconfig
> > index d672ab72ab12..b83093bcb48f 100644
> > --- a/net/mpls/Kconfig
> > +++ b/net/mpls/Kconfig
> > @@ -33,6 +33,7 @@ config MPLS_ROUTING
> >  config MPLS_IPTUNNEL
> >  	tristate "MPLS: IP over MPLS tunnel support"
> >  	depends on LWTUNNEL && MPLS_ROUTING
> > +	select NET_MPLS_GSO
> >  	help
> >  	 mpls ip tunnel support.
> >  
>