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

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Date:   Sun, 25 Oct 2020 14:43:09 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Guillaume Nault <gnault@...hat.com>
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, 23 Oct 2020 20:48:16 +0200 Guillaume Nault wrote:
> 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.

IMO the combination of select and softdep feels pretty strange.

It's either a softdep and therefore optional, or we really don't 
want to be missing it in a correctly functioning system, and the
dependency should be made stronger.