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[Magali Lemes do Sacramento <2069407@xxxxxxxxxxxxxxxxxx>]

Seems that it needs CONFIG_NET_FOU=y as per https://lore.kernel.org/all/CAK3+h2xJ+8JD=+A_FY3+Rja6D=xn0p7kq7e5VLOsez1sagQm+A@xxxxxxxxxxxxxx/T/#m8b94d7590580d70a87755d1df3c72af7962912eb
and we have CONFIG_NET_FOU=m

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https://bugs.launchpad.net/bugs/2069407

Title:
  ubuntu_bpf failed to build on Noble

Status in ubuntu-kernel-tests:
  New

Bug description:
  Test build failed since 6.8.0-19.19 (probably way more earlier, this
  is earliest one that I can see):

      CLNG-BPF [test_maps] test_tcpnotify_kern.bpf.o
      CLNG-BPF [test_maps] test_time_tai.bpf.o
      CLNG-BPF [test_maps] test_trace_ext.bpf.o
      CLNG-BPF [test_maps] test_trace_ext_tracing.bpf.o
      CLNG-BPF [test_maps] test_tracepoint.bpf.o
      CLNG-BPF [test_maps] test_trampoline_count.bpf.o
      CLNG-BPF [test_maps] test_tunnel_kern.bpf.o
    make[1]: Leaving directory '/home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf'
    make: Leaving directory '/home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests'
    stderr:
    Warning: Kernel ABI header at 'tools/include/uapi/linux/bpf.h' differs from latest version at 'include/uapi/linux/bpf.h'
    Warning: Kernel ABI header at 'tools/include/uapi/linux/if_xdp.h' differs from latest version at 'include/uapi/linux/if_xdp.h'
    progs/test_tunnel_kern.c:30:13: error: declaration of 'struct bpf_fou_encap' will not be visible outside of this function [-Werror,-Wvisibility]
       30 |                           struct bpf_fou_encap *encap, int type) __ksym;
          |                                  ^
    progs/test_tunnel_kern.c:32:13: error: declaration of 'struct bpf_fou_encap' will not be visible outside of this function [-Werror,-Wvisibility]
       32 |                           struct bpf_fou_encap *encap) __ksym;
          |                                  ^
    progs/test_tunnel_kern.c:741:23: error: variable has incomplete type 'struct bpf_fou_encap'
      741 |         struct bpf_fou_encap encap = {};
          |                              ^
    progs/test_tunnel_kern.c:741:9: note: forward declaration of 'struct bpf_fou_encap'
      741 |         struct bpf_fou_encap encap = {};
          |                ^
    progs/test_tunnel_kern.c:765:43: error: use of undeclared identifier 'FOU_BPF_ENCAP_GUE'
      765 |         ret = bpf_skb_set_fou_encap(skb, &encap, FOU_BPF_ENCAP_GUE);
          |                                                  ^
    progs/test_tunnel_kern.c:778:23: error: variable has incomplete type 'struct bpf_fou_encap'
      778 |         struct bpf_fou_encap encap = {};
          |                              ^
    progs/test_tunnel_kern.c:778:9: note: forward declaration of 'struct bpf_fou_encap'
      778 |         struct bpf_fou_encap encap = {};
          |                ^
    progs/test_tunnel_kern.c:802:43: error: use of undeclared identifier 'FOU_BPF_ENCAP_FOU'
      802 |         ret = bpf_skb_set_fou_encap(skb, &encap, FOU_BPF_ENCAP_FOU);
          |                                                  ^
    progs/test_tunnel_kern.c:816:23: error: variable has incomplete type 'struct bpf_fou_encap'
      816 |         struct bpf_fou_encap encap = {};
          |                              ^
    progs/test_tunnel_kern.c:816:9: note: forward declaration of 'struct bpf_fou_encap'
      816 |         struct bpf_fou_encap encap = {};
          |                ^
    7 errors generated.
    make[1]: *** [Makefile:620: /home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/test_tunnel_kern.bpf.o] Error 1
    make: *** [Makefile:180: all] Error 2

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