testing: net-drv: add a driver test for stats reporting

Add a very simple test to make sure drivers report expected
stats. Drivers which implement FEC or pause configuration
should report relevant stats. Qstats must be reported,
at least packet and byte counts, and they must match
total device stats.

Tested with netdevsim, bnxt, in-tree and installed.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2024-04-04 19:45:26 -07:00 committed by David S. Miller
parent b4db9f8402
commit f0e6c86e4b
1 changed files with 86 additions and 0 deletions

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#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0
from lib.py import ksft_run, ksft_in, ksft_true, KsftSkipEx, KsftXfailEx
from lib.py import EthtoolFamily, NetdevFamily, RtnlFamily, NlError
from lib.py import NetDrvEnv
ethnl = EthtoolFamily()
netfam = NetdevFamily()
rtnl = RtnlFamily()
def check_pause(cfg) -> None:
global ethnl
try:
ethnl.pause_get({"header": {"dev-index": cfg.ifindex}})
except NlError as e:
if e.error == 95:
raise KsftXfailEx("pause not supported by the device")
raise
data = ethnl.pause_get({"header": {"dev-index": cfg.ifindex,
"flags": {'stats'}}})
ksft_true(data['stats'], "driver does not report stats")
def check_fec(cfg) -> None:
global ethnl
try:
ethnl.fec_get({"header": {"dev-index": cfg.ifindex}})
except NlError as e:
if e.error == 95:
raise KsftXfailEx("FEC not supported by the device")
raise
data = ethnl.fec_get({"header": {"dev-index": cfg.ifindex,
"flags": {'stats'}}})
ksft_true(data['stats'], "driver does not report stats")
def pkt_byte_sum(cfg) -> None:
global netfam, rtnl
def get_qstat(test):
global netfam
stats = netfam.qstats_get({}, dump=True)
if stats:
for qs in stats:
if qs["ifindex"]== test.ifindex:
return qs
qstat = get_qstat(cfg)
if qstat is None:
raise KsftSkipEx("qstats not supported by the device")
for key in ['tx-packets', 'tx-bytes', 'rx-packets', 'rx-bytes']:
ksft_in(key, qstat, "Drivers should always report basic keys")
# Compare stats, rtnl stats and qstats must match,
# but the interface may be up, so do a series of dumps
# each time the more "recent" stats must be higher or same.
def stat_cmp(rstat, qstat):
for key in ['tx-packets', 'tx-bytes', 'rx-packets', 'rx-bytes']:
if rstat[key] != qstat[key]:
return rstat[key] - qstat[key]
return 0
for _ in range(10):
rtstat = rtnl.getlink({"ifi-index": cfg.ifindex})['stats']
if stat_cmp(rtstat, qstat) < 0:
raise Exception("RTNL stats are lower, fetched later")
qstat = get_qstat(cfg)
if stat_cmp(rtstat, qstat) > 0:
raise Exception("Qstats are lower, fetched later")
def main() -> None:
with NetDrvEnv(__file__) as cfg:
ksft_run([check_pause, check_fec, pkt_byte_sum],
args=(cfg, ))
if __name__ == "__main__":
main()