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[Mehmet Basaran <2069407@xxxxxxxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu Oracular)
       Status: In Progress => Fix Committed

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

Title:
  ubuntu_bpf failed to build on Noble / Oracular

Status in ubuntu-kernel-tests:
  New
Status in linux package in Ubuntu:
  New
Status in linux source package in Noble:
  In Progress
Status in linux source package in Oracular:
  Fix Committed

Bug description:
  SRU Justification

  [Impact]
  BPF selftests fail to build on Noble and Oracular. This happens because of
  commit 02b4e126e6 ("bpf: selftests: test_tunnel: Use vmlinux.h declarations"),
  which relies on the definitions of `bpf_fou_encap` and
  `bpf_fou_encap_type` used in test_tunnel_kern.c being on vmlinux.h.
  Since we have CONFIG_NET_FOU=m instead of =y, these declarations
  cannot be solved and the tests cannot be built.

  [Fix]
  Clean cherry-pick of d17f9b370df6 ("selftests/bpf: Fix compilation failure when
  CONFIG_NET_FOU!=y")

  [Test]
  1) Install build dependencies:
  apt install build-essential libelf-dev llvm clang lld libssl-dev docutils-common -y
  2) Build the tests using the kernel source tree with the patch applied:
  make -C tools/testing/selftests/ TARGETS=bpf SKIP_TARGETS= all KDIR=/usr/src/linux-headers-$(uname -r)/

  [Where problems could occur]
  Change is limited to BPF selftests, no problems should occur in the kernel
  image or modules.

  
  --------------------------------------------------------------------------------
  Original bug report:

  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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