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From:   Eric Dumazet <edumazet@google.com>
Date:   Wed, 17 Nov 2021 01:55:51 -0800
Message-ID: <CANn89iLAu9QAgqS_qzZYSHLmmPdL_2uD0RSmtrq4mPgkWzV8hQ@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 1:50 AM Eric Dumazet <edumazet@google.com> wrote:

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

Oh, maybe this is the missing part :

diff --git a/include/net/gro.h b/include/net/gro.h
index d0e7df691a807410049508355230a4523af590a1..9c22a010369cb89f9511d78cc322be56170d7b20
100644
--- a/include/net/gro.h
+++ b/include/net/gro.h
@@ -6,6 +6,7 @@
 #include <linux/indirect_call_wrapper.h>
 #include <linux/ip.h>
 #include <linux/ipv6.h>
+#include <net/ip6_checksum.h>
 #include <linux/skbuff.h>
 #include <net/udp.h>