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selftests/bpf: test offloads even with BPF programs present

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Modern distroes increasingly make use of BPF programs.  Default
Ubuntu 18.04 installation boots with a number of cgroup_skb
programs loaded.

test_offloads.py tries to check if programs and maps are not
leaked on error paths by confirming the list of programs on the
system is empty between tests.

Since we can no longer expect the system to have no BPF objects
at boot try to remember the programs and maps present at the start,
and skip those when scanning the system.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Jakub Kicinski 2018-06-14 11:06:56 -07:00 committed by Daniel Borkmann
parent 07480cbc05
commit 47cf52a246
1 changed files with 10 additions and 2 deletions
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12
tools/testing/selftests/bpf/test_offload.py
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@ -163,6 +163,10 @@ def bpftool(args, JSON=True, ns="", fail=True):
def bpftool_prog_list(expected=None, ns=""):
_, progs = bpftool("prog show", JSON=True, ns=ns, fail=True)
# Remove the base progs
for p in base_progs:
if p in progs:
progs.remove(p)
if expected is not None:
if len(progs) != expected:
fail(True, "%d BPF programs loaded, expected %d" %
@ -171,6 +175,10 @@ def bpftool_prog_list(expected=None, ns=""):
def bpftool_map_list(expected=None, ns=""):
_, maps = bpftool("map show", JSON=True, ns=ns, fail=True)
# Remove the base maps
for m in base_maps:
if m in maps:
maps.remove(m)
if expected is not None:
if len(maps) != expected:
fail(True, "%d BPF maps loaded, expected %d" %
@ -585,8 +593,8 @@ skip(os.getuid() != 0, "test must be run as root")
# Check tools
ret, progs = bpftool("prog", fail=False)
skip(ret != 0, "bpftool not installed")
# Check no BPF programs are loaded
skip(len(progs) != 0, "BPF programs already loaded on the system")
base_progs = progs
_, base_maps = bpftool("map")
# Check netdevsim
ret, out = cmd("modprobe netdevsim", fail=False)