[SRU][B/F/H/I/J][PATCH 0/1] Fix for selftests/net/reuseport_bpf_numa (lp#1867570)

Kleber Sacilotto de Souza kleber.souza at canonical.com
Mon Nov 8 11:25:39 UTC 2021

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

[ Impact ]
The reuseport_bpf_numa testcase in selftests/net fails on some PowerPC systems

 # 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.

Kleber Sacilotto de Souza (1):
  selftests/net: Fix reuseport_bpf_numa by skipping unavailable nodes

 tools/testing/selftests/net/reuseport_bpf_numa.c | 4 ++++
 1 file changed, 4 insertions(+)


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