On Wed, Nov 17, 2021 at 1:50 AM Eric Dumazet <edumazet@xxxxxxxxxx> 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>