Jiri reported some issues in test_xdp_redirect_multi.sh. Like
the test logs not cleaned after testing. The tcpdump not terminated cleanly.
arp number count may have false positive. And the most important, after
creating/deleting a lot interfaces, the interface index may exceed the
DEVMAP max entry and cause program xdp_redirect_multi exec failed.

This patch set fix all these issues.

Hangbin Liu (4):
  selftests/bpf/xdp_redirect_multi: put the logs to tmp folder
  selftests/bpf/xdp_redirect_multi: use arping to accurate the arp
    number
  selftests/bpf/xdp_redirect_multi: give tcpdump a chance to terminate
    cleanly
  selftests/bpf/xdp_redirect_multi: limit the tests in netns

 .../selftests/bpf/test_xdp_redirect_multi.sh  | 62 +++++++++++--------
 .../selftests/bpf/xdp_redirect_multi.c        |  4 +-
 2 files changed, 37 insertions(+), 29 deletions(-)

-- 
2.31.1