| Message ID | 20240729221042.2700882-1-sdf@fomichev.me (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | [net-next,1/2] selftests: net-drv: exercise queue stats when the device is down | expand |
On Mon, 29 Jul 2024 15:10:41 -0700 Stanislav Fomichev wrote: > Verify that total device stats don't decrease after it has been turned down. > Also make sure the device doesn't crash when we access per-queue stats > when it's down (in case it tries to access some pointers that are NULL). > > KTAP version 1 > 1..5 > ok 1 stats.check_pause > ok 2 stats.check_fec > ok 3 stats.pkt_byte_sum > ok 4 stats.qstat_by_ifindex > ok 5 stats.check_down > \# Totals: pass:5 fail:0 xfail:0 xpass:0 skip:0 error:0 nit: may be personal preference but if you indent by 2 spaces that will neutralize the # as well > +def check_down(cfg) -> None: > + try: > + qstat = netfam.qstats_get({"ifindex": cfg.ifindex}, dump=True) > + except NlError as e: > + if e.error == 95: > + raise KsftSkipEx("qstats not supported by the device") > + raise > + > + ip(f"link set dev {cfg.dev['ifname']} down") > + > + try: The rest of this test predates defer() but I think it may be cleaner: ip(f"link set dev {cfg.dev['ifname']} down") defer(ip, f"link set dev {cfg.dev['ifname']} up") then you don't need to try/finally. > + qstat = qstat[0] > + qstat2 = netfam.qstats_get({"ifindex": cfg.ifindex}, dump=True)[0] > + for k, v in qstat.items(): > + if k not in qstat2: > + # skip the stats that are not globally preserved > + continue I think we should fail if stats disappear. I can't think of a legit reason for that to happen. > + if qstat2[k] < qstat[k]: > + raise Exception(f"{k} ({qstat2[k]}) should be preserved but has lower value ({qstat[k]}) when the device is down") ksft_ge(qstat2[k], qstat[k], comment=k) ? > + > + # exercise per-queue API to make sure that "device down" state > + # is handled correctly and doesn't crash > + netfam.qstats_get({"ifindex": cfg.ifindex, "scope": "queue"}, dump=True) > + finally: > + ip(f"link set dev {cfg.dev['ifname']} up") > + > + > def main() -> None: > with NetDrvEnv(__file__) as cfg: > - ksft_run([check_pause, check_fec, pkt_byte_sum, qstat_by_ifindex], > + ksft_run([check_pause, check_fec, pkt_byte_sum, qstat_by_ifindex, > + check_down], > args=(cfg, )) > ksft_exit() >
diff --git a/tools/testing/selftests/drivers/net/stats.py b/tools/testing/selftests/drivers/net/stats.py index 820b8e0a22c6..6f8bef379565 100755 --- a/tools/testing/selftests/drivers/net/stats.py +++ b/tools/testing/selftests/drivers/net/stats.py @@ -5,6 +5,7 @@ from lib.py import ksft_run, ksft_exit, ksft_pr from lib.py import ksft_ge, ksft_eq, ksft_in, ksft_true, ksft_raises, KsftSkipEx, KsftXfailEx from lib.py import EthtoolFamily, NetdevFamily, RtnlFamily, NlError from lib.py import NetDrvEnv +from lib.py import ip ethnl = EthtoolFamily() netfam = NetdevFamily() @@ -133,9 +134,37 @@ rtnl = RtnlFamily() ksft_eq(cm.exception.nl_msg.extack['bad-attr'], '.ifindex') +def check_down(cfg) -> None: + try: + qstat = netfam.qstats_get({"ifindex": cfg.ifindex}, dump=True) + except NlError as e: + if e.error == 95: + raise KsftSkipEx("qstats not supported by the device") + raise + + ip(f"link set dev {cfg.dev['ifname']} down") + + try: + qstat = qstat[0] + qstat2 = netfam.qstats_get({"ifindex": cfg.ifindex}, dump=True)[0] + for k, v in qstat.items(): + if k not in qstat2: + # skip the stats that are not globally preserved + continue + if qstat2[k] < qstat[k]: + raise Exception(f"{k} ({qstat2[k]}) should be preserved but has lower value ({qstat[k]}) when the device is down") + + # exercise per-queue API to make sure that "device down" state + # is handled correctly and doesn't crash + netfam.qstats_get({"ifindex": cfg.ifindex, "scope": "queue"}, dump=True) + finally: + ip(f"link set dev {cfg.dev['ifname']} up") + + def main() -> None: with NetDrvEnv(__file__) as cfg: - ksft_run([check_pause, check_fec, pkt_byte_sum, qstat_by_ifindex], + ksft_run([check_pause, check_fec, pkt_byte_sum, qstat_by_ifindex, + check_down], args=(cfg, )) ksft_exit()
Verify that total device stats don't decrease after it has been turned down. Also make sure the device doesn't crash when we access per-queue stats when it's down (in case it tries to access some pointers that are NULL). KTAP version 1 1..5 ok 1 stats.check_pause ok 2 stats.check_fec ok 3 stats.pkt_byte_sum ok 4 stats.qstat_by_ifindex ok 5 stats.check_down \# Totals: pass:5 fail:0 xfail:0 xpass:0 skip:0 error:0 Signed-off-by: Stanislav Fomichev <sdf@fomichev.me> -- Cc: Shuah Khan <shuah@kernel.org> Cc: Joe Damato <jdamato@fastly.com> Cc: Petr Machata <petrm@nvidia.com> Cc: linux-kselftest@vger.kernel.org --- tools/testing/selftests/drivers/net/stats.py | 31 +++++++++++++++++++- 1 file changed, 30 insertions(+), 1 deletion(-)