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#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0
"""Regression tests for the SO_TXTIME interface.
Test delivery time in FQ and ETF qdiscs.
"""
import os
import time
from lib.py import ksft_exit, ksft_run, ksft_variants
from lib.py import KsftNamedVariant, KsftSkipEx
from lib.py import NetDrvEpEnv, bkg, cmd, defer, tc
from lib.py import CmdExitFailure, RtnlFamily, NlError
_HW_OFFLOAD_HORIZON_MS = 50
def test_so_txtime(cfg, clockid, ipver, args_tx, args_rx, expect_success,
timing_sensitive=False):
"""Main function. Run so_txtime as sender and receiver."""
slow_machine = os.environ.get('KSFT_MACHINE_SLOW')
if not hasattr(cfg, "bin_remote"):
cfg.bin_local = cfg.test_dir / "so_txtime"
cfg.bin_remote = cfg.remote.deploy(cfg.bin_local)
tstart = time.time_ns() + (2000_000_000 if slow_machine else 200_000_000)
cmd_addr = f"-S {cfg.addr_v[ipver]} -D {cfg.remote_addr_v[ipver]}"
cmd_args = f"-{ipver} -c {clockid} -t {tstart} {cmd_addr}"
cmd_rx = f"{cfg.bin_remote} {cmd_args} {args_rx} -r"
cmd_tx = f"{cfg.bin_local} -m 100 {cmd_args} {args_tx}"
expect_fail = not expect_success
if slow_machine:
expect_success = False
if timing_sensitive:
expect_fail = None
with bkg(cmd_rx, host=cfg.remote, fail=expect_success,
expect_fail=expect_fail, exit_wait=True):
cmd(cmd_tx)
def _dev_setup_pacing_offload(cfg):
"""Configure pacing-offload."""
rtnl = RtnlFamily()
try:
link = rtnl.getlink({'ifi-index': cfg.ifindex})
except NlError as e:
raise KsftSkipEx('getlink not supported by device') from e
if 'pacing-offload' not in link or \
'max-pacing-offload-horizon' not in link:
raise KsftSkipEx('pacing offload not supported by device')
horizon = _HW_OFFLOAD_HORIZON_MS * 1000_000
if link['max-pacing-offload-horizon'] < horizon:
raise KsftSkipEx('pacing offload max horizon too small')
cur_offload = link['pacing-offload']
rtnl.setlink({
'ifi-index': cfg.ifindex,
'pacing-offload': 1,
})
defer(rtnl.setlink, {
'ifi-index': cfg.ifindex,
'pacing-offload': cur_offload
})
def _qdisc_setup(ifname, qdisc, optargs=""):
"""Replace root qdisc. Restore the original after the test.
If the original is mq, children will be of type default_qdisc.
"""
orig = tc(f"qdisc show dev {ifname} root", json=True)[0].get("kind", None)
defer(tc, f"qdisc replace dev {ifname} root {orig}")
try:
tc(f"qdisc del dev {ifname} root")
except CmdExitFailure:
pass
tc(f"qdisc replace dev {ifname} root handle 1: {qdisc} {optargs}")
def _test_variants_fq():
for ipver in ["4", "6"]:
for testcase in [
["no_delay", "a,-1", "a,-1"],
["zero_delay", "a,0", "a,0"],
["one_pkt", "a,10", "a,10"],
["in_order", "a,10,b,20", "a,10,b,20"],
["reverse_order", "a,20,b,10", "b,10,a,20"],
["beyond_hw_horizon", "a,70", "a,70"],
]:
name = f"v{ipver}_{testcase[0]}"
yield KsftNamedVariant(name, ipver, testcase[1], testcase[2])
@ksft_variants(_test_variants_fq())
def test_so_txtime_fq_mono(cfg, ipver, args_tx, args_rx):
"""Run all variants of monotonic (fq) tests."""
cfg.require_ipver(ipver)
_qdisc_setup(cfg.ifname, "fq")
test_so_txtime(cfg, "mono", ipver, args_tx, args_rx, True)
@ksft_variants(_test_variants_fq())
def test_so_txtime_fq_mono_hw(cfg, ipver, args_tx, args_rx):
"""Run all variants of monotonic fq tests, with offload horizon."""
cfg.require_ipver(ipver)
cfg.require_nsim(nsim_test=False)
_dev_setup_pacing_offload(cfg)
try:
_qdisc_setup(cfg.ifname, "fq", f"offload_horizon {_HW_OFFLOAD_HORIZON_MS}ms")
except Exception as e:
raise KsftSkipEx("netdev does not support offload. skipping") from e
# Expect all tests to use only hw pacing, except beyond_hw_horizon.
# Do not pass -H to that test so that with sw pacing fallback it passes.
hw_only = "-H" if args_tx != "a,70" else ""
test_so_txtime(cfg, "mono", ipver, f"{hw_only} {args_tx}", args_rx, True)
@ksft_variants(_test_variants_fq())
def test_so_txtime_pfifofast_mono_hw(cfg, ipver, args_tx, args_rx):
"""Run all variants of monotonic tests, without fq pacing sw backup."""
cfg.require_ipver(ipver)
cfg.require_nsim(nsim_test=False)
_dev_setup_pacing_offload(cfg)
_qdisc_setup(cfg.ifname, "pfifo_fast")
# Expect all tests to pass, except beyond_hw_horizon without sw fallback.
# It will send immediately, failing the receiver arrival bounds check.
expect_pass = args_tx != "a,70"
timing_sensitive = not expect_pass
test_so_txtime(cfg, "mono", ipver, f"-H {args_tx}", args_rx, expect_pass,
timing_sensitive=timing_sensitive)
@ksft_variants(_test_variants_fq())
def test_so_txtime_fq_tai(cfg, ipver, args_tx, args_rx):
"""Run all variants of fq tests, but pass CLOCK_TAI to test conversion."""
cfg.require_ipver(ipver)
_qdisc_setup(cfg.ifname, "fq")
test_so_txtime(cfg, "tai", ipver, args_tx, args_rx, True)
def _test_variants_etf():
for ipver in ["4", "6"]:
for testcase in [
["no_delay", "a,-1", "a,-1", False],
["zero_delay", "a,0", "a,0", False],
["one_pkt", "a,10", "a,10", True],
["in_order", "a,10,b,20", "a,10,b,20", True],
["reverse_order", "a,20,b,10", "b,10,a,20", True],
]:
name = f"v{ipver}_{testcase[0]}"
yield KsftNamedVariant(
name, ipver, testcase[1], testcase[2], testcase[3]
)
@ksft_variants(_test_variants_etf())
def test_so_txtime_etf(cfg, ipver, args_tx, args_rx, expect_fail):
"""Run all variants of etf tests."""
cfg.require_ipver(ipver)
# root qdisc for background traffic (e.g., bkg())
_qdisc_setup(cfg.ifname, "prio")
# leaf ETF qdisc only for intended packets
try:
etf_args = "clockid CLOCK_TAI delta 400000"
tc(f"qdisc add dev {cfg.ifname} parent 1:1 handle 10: etf {etf_args}")
except Exception as e:
raise KsftSkipEx("tc does not support qdisc etf. skipping") from e
# redirect mark 100 to leaf
filter_args = "protocol all handle 100 fw flowid 1:1"
tc(f"filter add dev {cfg.ifname} parent 1: {filter_args}")
test_so_txtime(cfg, "tai", ipver, args_tx, args_rx, expect_fail)
def main() -> None:
"""Boilerplate ksft main."""
with NetDrvEpEnv(__file__) as cfg:
ksft_run(
[
test_so_txtime_fq_mono,
test_so_txtime_fq_mono_hw,
test_so_txtime_pfifofast_mono_hw,
test_so_txtime_fq_tai,
test_so_txtime_etf,
],
args=(cfg,),
)
ksft_exit()
if __name__ == "__main__":
main()
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