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From:   Eric Dumazet <edumazet@google.com>
Date:   Wed, 17 Nov 2021 01:50:18 -0800
Message-ID: <CANn89iKSZKvySL6+-gk7UGCowRoApJQmvUpYfiKChSSbxr=LYw@mail.gmail.com>
Subject: Re: linux-next: Tree for Nov 17 (uml, no IPV6)
To:     Geert Uytterhoeven <geert@linux-m68k.org>
Cc:     Randy Dunlap <rdunlap@infradead.org>,
        Stephen Rothwell <sfr@canb.auug.org.au>,
        Linux Next Mailing List <linux-next@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Netdev <netdev@vger.kernel.org>,
        Masahiro Yamada <masahiroy@kernel.org>,
        David Miller <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>
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On Wed, Nov 17, 2021 at 1:47 AM Geert Uytterhoeven <geert@linux-m68k.org> w=
rote:
>
> Hi Eric,
>
> On Wed, Nov 17, 2021 at 10:38 AM Eric Dumazet <edumazet@google.com> wrote=
:
> > On Wed, Nov 17, 2021 at 12:44 AM Geert Uytterhoeven
> > <geert@linux-m68k.org> wrote:
> > > On Wed, Nov 17, 2021 at 6:49 AM Randy Dunlap <rdunlap@infradead.org> =
wrote:
> > > > On 11/16/21 6:58 PM, Stephen Rothwell wrote:
> > > > > Changes since 20211116:
> > > >
> > > > ARCH=3Dum SUBARCH=3Dx86_64:
> > > > # CONFIG_IPV6 is not set
> > >
> > > It doesn't always happen with CONFIG_IPV6=3Dn, so I guess that's why
> > > it wasn't detected before.
> >
> > Thanks for letting me know
> >
> > I guess the following addition would fix the issue ?
> >
> > diff --git a/arch/x86/um/asm/checksum_64.h b/arch/x86/um/asm/checksum_6=
4.h
> > index 7b6cd1921573c97361b8d486bbba3e8870d53ad6..4f0c15a61925c46b261f87f=
a319e6aff28f4cfce
> > 100644
> > --- a/arch/x86/um/asm/checksum_64.h
> > +++ b/arch/x86/um/asm/checksum_64.h
>
> Are you sure that's the right fix?
> That won't fix the issue with m5272c3_defconfig.
>
> > > > In file included from ../net/ethernet/eth.c:62:0:
> > > > ../include/net/gro.h: In function =E2=80=98ip6_gro_compute_pseudo=
=E2=80=99:
> > > > ../include/net/gro.h:413:22: error: implicit declaration of functio=
n =E2=80=98csum_ipv6_magic=E2=80=99; did you mean =E2=80=98csum_tcpudp_magi=
c=E2=80=99? [-Werror=3Dimplicit-function-declaration]
> > > >    return ~csum_unfold(csum_ipv6_magic(&iph->saddr, &iph->daddr,
> > > >                        ^~~~~~~~~~~~~~~
> > > >                        csum_tcpudp_magic
> > > >
> > > >
> > > > After I made ip6_gro_compute_pseudo() conditional on CONFIG_IPV6,
> > > > I got this build error:
> > > >
> > > > In file included from ../net/ipv6/tcpv6_offload.c:10:0:
> > > > ../net/ipv6/tcpv6_offload.c: In function =E2=80=98tcp6_gro_receive=
=E2=80=99:
> > > > ../net/ipv6/tcpv6_offload.c:22:11: error: implicit declaration of f=
unction =E2=80=98ip6_gro_compute_pseudo=E2=80=99; did you mean =E2=80=98ine=
t_gro_compute_pseudo=E2=80=99? [-Werror=3Dimplicit-function-declaration]
> > > >             ip6_gro_compute_pseudo)) {
> > > >             ^
> > > > ../include/net/gro.h:235:5: note: in definition of macro =E2=80=98_=
_skb_gro_checksum_validate=E2=80=99
> > > >       compute_pseudo(skb, proto));  \
> > > >       ^~~~~~~~~~~~~~
> > > > ../net/ipv6/tcpv6_offload.c:21:6: note: in expansion of macro =E2=
=80=98skb_gro_checksum_validate=E2=80=99
> > > >        skb_gro_checksum_validate(skb, IPPROTO_TCP,
> > > >        ^~~~~~~~~~~~~~~~~~~~~~~~~
> > > >
> > > >
> > > >
> > > > This is UML x86_64 defconfig:
> > > >
> > > > $ make ARCH=3Dum SUBARCH=3Dx86_64 defconfig all
> > >
> > > noreply@ellerman.id.au reported the same issue for m5272c3_defconfig,
> > > and I've bisected the failure to commit 4721031c3559db8e ("net:
> > > move gro definitions to include/net/gro.h").
>
> arch/m68k/include/asm/checksum.h defines csum_ipv6_magic()
> unconditionally, so it looks like just a missing #include.

I don't know, apparently on UM, csum_ipv6_magic() is only found in
arch/x86/um/asm/checksum_32.h,
no idea why...


>
> Gr{oetje,eeting}s,
>
>                         Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m6=
8k.org
>
> In personal conversations with technical people, I call myself a hacker. =
But
> when I'm talking to journalists I just say "programmer" or something like=
 that.
>                                 -- Linus Torvalds