On Wed, 2022-06-01 at 01:01 +0200, Daniel Borkmann wrote:

On 5/30/22 8:21 AM, Lina Wang wrote:
clang -O2 -target bpf -c bpf/nat6to4.c -I../../bpf -I../../../../lib
-I../../../../../usr/include/ -o
/root/daniel/bpf/tools/testing/selftests/net/bpf/nat6to4.o
In file included from bpf/nat6to4.c:27:
In file included from /usr/include/linux/bpf.h:11:
/usr/include/linux/types.h:5:10: fatal error: 'asm/types.h' file not
found
#include <asm/types.h>
          ^~~~~~~~~~~~~
1 error generated.

maybe your pc is ubuntu or Debian, you should apt-get install gcc-multilib, 
guys on the internet meets the same problem when build libbpf related, just
install gcc-multilib package

Could we reuse the build infra from tools/testing/selftests/bpf/ for nat6to4.c?

We discussed it before, please refer to https://patchwork.kernel.org/project/netdevbpf/patch/20220407084727.10241-1-lina.wang@mediatek.com/

Thanks!