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[Jürg Häfliger <1867570@xxxxxxxxxxxxxxxxxx>]

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/1867570

Title:
  reuseport_bpf_numa in net from ubuntu_kernel_selftests fails on
  ppc64le

Status in ubuntu-kernel-tests:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Bionic:
  Fix Released
Status in linux source package in Focal:
  Fix Released
Status in linux source package in Hirsute:
  Fix Released
Status in linux source package in Impish:
  Fix Released
Status in linux source package in Jammy:
  Fix Released

Bug description:
  [ Impact ]
  The reuseport_bpf_numa testcase in selftests/net fails on some PowerPC systems with:

   # selftests: net: reuseport_bpf_numa
   # ---- IPv4 UDP ----
   # send node 0, receive socket 0
   # libnuma: Warning: Cannot read node cpumask from sysfs
   # ./reuseport_bpf_numa: failed to pin to node: No such file or directory
   not ok 3 selftests: net: reuseport_bpf_numa # exit=1

  [ Fix ]
  In some platforms the numa node numbers are not necessarily consecutive, so when reuseport_bpf_numa iterates on the nodes from 0 to the max available node some of those will not be available. The fix is to change the testcase so it checks whether the node is available before trying to send/receive from it.

  [ Test ]
  Run reuseport_bpf_numa from selftests/net in one of the affected test nodes.

  [ Where Problems Could Occur ]
  This is a very simple fix which relies on the libnuma exported functions and bitmaps to check whether a numa node number is available on the system. If something is not right on how this check is made or on the libnuma code itself only the reuseport_bpf_numa testcase will be affected by reporting false negatives or having a reduced test coverage.

  [ Original bug report ]
  This issue was extracted from the comment in bug 1812638, since that bug will be specific for i386

  This reuseport_bpf_numa in net will fail on PowerPC with:

  The output on B-5.3 P8 is:
   # selftests: net: reuseport_bpf_numa
   # ---- IPv4 UDP ----
   # send node 0, receive socket 0
   # send node 1, receive socket 7
   # ./reuseport_bpf_numa: node id/receive socket mismatch
   not ok 3 selftests: net: reuseport_bpf_numa # exit=1

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