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#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0
import errno
import os
from typing import Union
from lib.py import ksft_run, ksft_exit, ksft_eq, ksft_raises, KsftSkipEx
from lib.py import CmdExitFailure, EthtoolFamily, NlError
from lib.py import NetDrvEnv
from lib.py import defer, ethtool, ip, random
def _get_hds_mode(cfg, netnl) -> str:
try:
rings = netnl.rings_get({'header': {'dev-index': cfg.ifindex}})
except NlError as e:
raise KsftSkipEx('ring-get not supported by device')
if 'tcp-data-split' not in rings:
raise KsftSkipEx('tcp-data-split not supported by device')
return rings['tcp-data-split']
def _xdp_onoff(cfg):
prog = cfg.net_lib_dir / "xdp_dummy.bpf.o"
ip("link set dev %s xdp obj %s sec xdp" %
(cfg.ifname, prog))
ip("link set dev %s xdp off" % cfg.ifname)
def _ioctl_ringparam_modify(cfg, netnl) -> None:
"""
Helper for performing a hopefully unimportant IOCTL SET.
IOCTL does not support HDS, so it should not affect the HDS config.
"""
try:
rings = netnl.rings_get({'header': {'dev-index': cfg.ifindex}})
except NlError as e:
raise KsftSkipEx('ring-get not supported by device')
if 'tx' not in rings:
raise KsftSkipEx('setting Tx ring size not supported')
try:
ethtool(f"--disable-netlink -G {cfg.ifname} tx {rings['tx'] // 2}")
except CmdExitFailure as e:
ethtool(f"--disable-netlink -G {cfg.ifname} tx {rings['tx'] * 2}")
defer(ethtool, f"-G {cfg.ifname} tx {rings['tx']}")
def get_hds(cfg, netnl) -> None:
_get_hds_mode(cfg, netnl)
def get_hds_thresh(cfg, netnl) -> None:
try:
rings = netnl.rings_get({'header': {'dev-index': cfg.ifindex}})
except NlError as e:
raise KsftSkipEx('ring-get not supported by device')
if 'hds-thresh' not in rings:
raise KsftSkipEx('hds-thresh not supported by device')
def _hds_reset(cfg, netnl, rings) -> None:
cur = netnl.rings_get({'header': {'dev-index': cfg.ifindex}})
arg = {'header': {'dev-index': cfg.ifindex}}
if cur.get('tcp-data-split') != rings.get('tcp-data-split'):
# Try to reset to "unknown" first, we don't know if the setting
# was the default or user chose it. Default seems more likely.
arg['tcp-data-split'] = "unknown"
netnl.rings_set(arg)
cur = netnl.rings_get({'header': {'dev-index': cfg.ifindex}})
if cur['tcp-data-split'] == rings['tcp-data-split']:
del arg['tcp-data-split']
else:
# Try the explicit setting
arg['tcp-data-split'] = rings['tcp-data-split']
if cur.get('hds-thresh') != rings.get('hds-thresh'):
arg['hds-thresh'] = rings['hds-thresh']
if len(arg) > 1:
netnl.rings_set(arg)
def _defer_reset_hds(cfg, netnl) -> Union[dict, None]:
try:
rings = netnl.rings_get({'header': {'dev-index': cfg.ifindex}})
if 'hds-thresh' in rings or 'tcp-data-split' in rings:
defer(_hds_reset, cfg, netnl, rings)
except NlError as e:
pass
def set_hds_enable(cfg, netnl) -> None:
_defer_reset_hds(cfg, netnl)
try:
netnl.rings_set({'header': {'dev-index': cfg.ifindex}, 'tcp-data-split': 'enabled'})
except NlError as e:
if e.error == errno.EINVAL:
raise KsftSkipEx("disabling of HDS not supported by the device")
elif e.error == errno.EOPNOTSUPP:
raise KsftSkipEx("ring-set not supported by the device")
try:
rings = netnl.rings_get({'header': {'dev-index': cfg.ifindex}})
except NlError as e:
raise KsftSkipEx('ring-get not supported by device')
if 'tcp-data-split' not in rings:
raise KsftSkipEx('tcp-data-split not supported by device')
ksft_eq('enabled', rings['tcp-data-split'])
def set_hds_disable(cfg, netnl) -> None:
_defer_reset_hds(cfg, netnl)
try:
netnl.rings_set({'header': {'dev-index': cfg.ifindex}, 'tcp-data-split': 'disabled'})
except NlError as e:
if e.error == errno.EINVAL:
raise KsftSkipEx("disabling of HDS not supported by the device")
elif e.error == errno.EOPNOTSUPP:
raise KsftSkipEx("ring-set not supported by the device")
try:
rings = netnl.rings_get({'header': {'dev-index': cfg.ifindex}})
except NlError as e:
raise KsftSkipEx('ring-get not supported by device')
if 'tcp-data-split' not in rings:
raise KsftSkipEx('tcp-data-split not supported by device')
ksft_eq('disabled', rings['tcp-data-split'])
def set_hds_thresh_zero(cfg, netnl) -> None:
_defer_reset_hds(cfg, netnl)
try:
netnl.rings_set({'header': {'dev-index': cfg.ifindex}, 'hds-thresh': 0})
except NlError as e:
if e.error == errno.EINVAL:
raise KsftSkipEx("hds-thresh-set not supported by the device")
elif e.error == errno.EOPNOTSUPP:
raise KsftSkipEx("ring-set not supported by the device")
try:
rings = netnl.rings_get({'header': {'dev-index': cfg.ifindex}})
except NlError as e:
raise KsftSkipEx('ring-get not supported by device')
if 'hds-thresh' not in rings:
raise KsftSkipEx('hds-thresh not supported by device')
ksft_eq(0, rings['hds-thresh'])
def set_hds_thresh_random(cfg, netnl) -> None:
_defer_reset_hds(cfg, netnl)
try:
rings = netnl.rings_get({'header': {'dev-index': cfg.ifindex}})
except NlError as e:
raise KsftSkipEx('ring-get not supported by device')
if 'hds-thresh' not in rings:
raise KsftSkipEx('hds-thresh not supported by device')
if 'hds-thresh-max' not in rings:
raise KsftSkipEx('hds-thresh-max not defined by device')
if rings['hds-thresh-max'] < 2:
raise KsftSkipEx('hds-thresh-max is too small')
elif rings['hds-thresh-max'] == 2:
hds_thresh = 1
else:
while True:
hds_thresh = random.randint(1, rings['hds-thresh-max'] - 1)
if hds_thresh != rings['hds-thresh']:
break
try:
netnl.rings_set({'header': {'dev-index': cfg.ifindex}, 'hds-thresh': hds_thresh})
except NlError as e:
if e.error == errno.EINVAL:
raise KsftSkipEx("hds-thresh-set not supported by the device")
elif e.error == errno.EOPNOTSUPP:
raise KsftSkipEx("ring-set not supported by the device")
rings = netnl.rings_get({'header': {'dev-index': cfg.ifindex}})
ksft_eq(hds_thresh, rings['hds-thresh'])
def set_hds_thresh_max(cfg, netnl) -> None:
_defer_reset_hds(cfg, netnl)
try:
rings = netnl.rings_get({'header': {'dev-index': cfg.ifindex}})
except NlError as e:
raise KsftSkipEx('ring-get not supported by device')
if 'hds-thresh' not in rings:
raise KsftSkipEx('hds-thresh not supported by device')
try:
netnl.rings_set({'header': {'dev-index': cfg.ifindex}, 'hds-thresh': rings['hds-thresh-max']})
except NlError as e:
if e.error == errno.EINVAL:
raise KsftSkipEx("hds-thresh-set not supported by the device")
elif e.error == errno.EOPNOTSUPP:
raise KsftSkipEx("ring-set not supported by the device")
rings = netnl.rings_get({'header': {'dev-index': cfg.ifindex}})
ksft_eq(rings['hds-thresh'], rings['hds-thresh-max'])
def set_hds_thresh_gt(cfg, netnl) -> None:
_defer_reset_hds(cfg, netnl)
try:
rings = netnl.rings_get({'header': {'dev-index': cfg.ifindex}})
except NlError as e:
raise KsftSkipEx('ring-get not supported by device')
if 'hds-thresh' not in rings:
raise KsftSkipEx('hds-thresh not supported by device')
if 'hds-thresh-max' not in rings:
raise KsftSkipEx('hds-thresh-max not defined by device')
hds_gt = rings['hds-thresh-max'] + 1
with ksft_raises(NlError) as e:
netnl.rings_set({'header': {'dev-index': cfg.ifindex}, 'hds-thresh': hds_gt})
ksft_eq(e.exception.nl_msg.error, -errno.EINVAL)
def set_xdp(cfg, netnl) -> None:
"""
Enable single-buffer XDP on the device.
When HDS is in "auto" / UNKNOWN mode, XDP installation should work.
"""
mode = _get_hds_mode(cfg, netnl)
if mode == 'enabled':
_defer_reset_hds(cfg, netnl)
netnl.rings_set({'header': {'dev-index': cfg.ifindex},
'tcp-data-split': 'unknown'})
_xdp_onoff(cfg)
def enabled_set_xdp(cfg, netnl) -> None:
"""
Enable single-buffer XDP on the device.
When HDS is in "enabled" mode, XDP installation should not work.
"""
_get_hds_mode(cfg, netnl)
netnl.rings_set({'header': {'dev-index': cfg.ifindex},
'tcp-data-split': 'enabled'})
defer(netnl.rings_set, {'header': {'dev-index': cfg.ifindex},
'tcp-data-split': 'unknown'})
with ksft_raises(CmdExitFailure) as e:
_xdp_onoff(cfg)
def set_xdp(cfg, netnl) -> None:
"""
Enable single-buffer XDP on the device.
When HDS is in "auto" / UNKNOWN mode, XDP installation should work.
"""
mode = _get_hds_mode(cfg, netnl)
if mode == 'enabled':
netnl.rings_set({'header': {'dev-index': cfg.ifindex},
'tcp-data-split': 'unknown'})
_xdp_onoff(cfg)
def enabled_set_xdp(cfg, netnl) -> None:
"""
Enable single-buffer XDP on the device.
When HDS is in "enabled" mode, XDP installation should not work.
"""
_get_hds_mode(cfg, netnl) # Trigger skip if not supported
netnl.rings_set({'header': {'dev-index': cfg.ifindex},
'tcp-data-split': 'enabled'})
defer(netnl.rings_set, {'header': {'dev-index': cfg.ifindex},
'tcp-data-split': 'unknown'})
with ksft_raises(CmdExitFailure) as e:
_xdp_onoff(cfg)
def ioctl(cfg, netnl) -> None:
mode1 = _get_hds_mode(cfg, netnl)
_ioctl_ringparam_modify(cfg, netnl)
mode2 = _get_hds_mode(cfg, netnl)
ksft_eq(mode1, mode2)
def ioctl_set_xdp(cfg, netnl) -> None:
"""
Like set_xdp(), but we perturb the settings via the legacy ioctl.
"""
mode = _get_hds_mode(cfg, netnl)
if mode == 'enabled':
netnl.rings_set({'header': {'dev-index': cfg.ifindex},
'tcp-data-split': 'unknown'})
_ioctl_ringparam_modify(cfg, netnl)
_xdp_onoff(cfg)
def ioctl_enabled_set_xdp(cfg, netnl) -> None:
"""
Enable single-buffer XDP on the device.
When HDS is in "enabled" mode, XDP installation should not work.
"""
_get_hds_mode(cfg, netnl) # Trigger skip if not supported
netnl.rings_set({'header': {'dev-index': cfg.ifindex},
'tcp-data-split': 'enabled'})
defer(netnl.rings_set, {'header': {'dev-index': cfg.ifindex},
'tcp-data-split': 'unknown'})
with ksft_raises(CmdExitFailure) as e:
_xdp_onoff(cfg)
def main() -> None:
with NetDrvEnv(__file__, queue_count=3) as cfg:
ksft_run([get_hds,
get_hds_thresh,
set_hds_disable,
set_hds_enable,
set_hds_thresh_random,
set_hds_thresh_zero,
set_hds_thresh_max,
set_hds_thresh_gt,
set_xdp,
enabled_set_xdp,
ioctl,
ioctl_set_xdp,
ioctl_enabled_set_xdp],
args=(cfg, EthtoolFamily()))
ksft_exit()
if __name__ == "__main__":
main()
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