canonical-ubuntu-qa team mailing list archive

[Jürg Häfliger <2001618@xxxxxxxxxxxxxxxxxx>]

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/2001618

Title:
  BPF_[AND|OR|XOR|FETCH|XCHG|CMPXCHG] in net:test_bpf.sh from
  ubuntu_kernel_selftests failed on K-5.19 P9

Status in ubuntu-kernel-tests:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Kinetic:
  Fix Released

Bug description:
  [Impact]
  The BPF_AND, BPF_OR, BPF_XOR, BPF_FETCH, BPF_XCHG and BPF_CMPXCHG related tests will fail in net:test_bpf test from ubuntu_kernel_selftests as they are not supported.

   test_bpf: #361 BPF_ATOMIC | BPF_W, BPF_AND: Test: 0x12 & 0xab = 0x02
   eBPF filter atomic op code c3 (@3) unsupported
   FAIL to select_runtime err=-524
   ...
   test_bpf: #365 BPF_ATOMIC | BPF_W, BPF_AND | BPF_FETCH: Test: 0x12 & 0xab = 0x02
   eBPF filter atomic op code c3 (@3) unsupported
   FAIL to select_runtime err=-524
   ...
   test_bpf: #377 BPF_ATOMIC | BPF_W, BPF_OR: Test: 0x12 | 0xab = 0xbb FAIL to select_runtime err=-524
   ...
   test_bpf: #393 BPF_ATOMIC | BPF_W, BPF_XOR: Test: 0x12 ^ 0xab = 0xb9 FAIL to select_runtime err=-524
   ...
   test_bpf: #409 BPF_ATOMIC | BPF_W, BPF_XCHG: Test: 0x12 xchg 0xab = 0xab
   eBPF filter atomic op code c3 (@3) unsupported
   FAIL to select_runtime err=-524
   ...
   test_bpf: #417 BPF_ATOMIC | BPF_W, BPF_CMPXCHG: Test successful return
   eBPF filter atomic op code c3 (@3) unsupported
   FAIL to select_runtime err=-524
   ...
   test_bpf: Summary: 894 PASSED, 132 FAILED, [882/882 JIT'ed]

  Please find attachment for the complete test log.

  [Fix]
  * 6511270911 powerpc/bpf/64: add support for BPF_ATOMIC bitwise operations
  * dbe6e2456f powerpc/bpf/64: add support for atomic fetch operations
  * 1e82dfaa78 powerpc/bpf/64: Add instructions for atomic_[cmp]xchg
  These patches can be cherry-picked into Kinetic kernel.

  [Test]
  Test kernel can be found here:
  https://people.canonical.com/~phlin/kernel/lp-2001618-ppcbpf/

  Steps:
  1. Reboot with the patched kernel
  2. Run:
    sudo dmesg -C
    sudo modprobe test_bpf
    sudo dmesg

  Tested with Power9 node baltar, with the patched kernel there will be no failure reported by the test_bpf:
    test_bpf: Summary: 1026 PASSED, 0 FAILED, [1014/1014 JIT'ed]

  [Where problems could occur]
  This patchset just broaden the BPF operations support on ppc64, we might see some new failures when using these instruction somewhere in the future.

  Cascardo: The existing atomic operations may regress as well, since
  they now produce different code.

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