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#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0
from lib.py import ksft_run, ksft_exit
from lib.py import ksft_ge, ksft_eq
from lib.py import KsftSkipEx
from lib.py import ksft_disruptive
from lib.py import EthtoolFamily, NetdevFamily
from lib.py import NetDrvEnv
from lib.py import cmd, ip, defer
def read_affinity(irq) -> str:
with open(f'/proc/irq/{irq}/smp_affinity', 'r') as fp:
return fp.read().lstrip("0,").strip()
def write_affinity(irq, what) -> str:
if what != read_affinity(irq):
with open(f'/proc/irq/{irq}/smp_affinity', 'w') as fp:
fp.write(what)
def check_irqs_reported(cfg) -> None:
""" Check that device reports IRQs for NAPI instances """
napis = cfg.netnl.napi_get({"ifindex": cfg.ifindex}, dump=True)
irqs = sum(['irq' in x for x in napis])
ksft_ge(irqs, 1)
ksft_eq(irqs, len(napis))
def _check_reconfig(cfg, reconfig_cb) -> None:
napis = cfg.netnl.napi_get({"ifindex": cfg.ifindex}, dump=True)
for n in reversed(napis):
if 'irq' in n:
break
else:
raise KsftSkipEx(f"Device has no NAPI with IRQ attribute (#napis: {len(napis)}")
old = read_affinity(n['irq'])
# pick an affinity that's not the current one
new = "3" if old != "3" else "5"
write_affinity(n['irq'], new)
defer(write_affinity, n['irq'], old)
reconfig_cb(cfg)
ksft_eq(read_affinity(n['irq']), new, comment="IRQ affinity changed after reconfig")
def check_reconfig_queues(cfg) -> None:
def reconfig(cfg) -> None:
channels = cfg.ethnl.channels_get({'header': {'dev-index': cfg.ifindex}})
if channels['combined-count'] == 0:
rx_type = 'rx'
else:
rx_type = 'combined'
cur_queue_cnt = channels[f'{rx_type}-count']
max_queue_cnt = channels[f'{rx_type}-max']
cmd(f"ethtool -L {cfg.ifname} {rx_type} 1")
cmd(f"ethtool -L {cfg.ifname} {rx_type} {max_queue_cnt}")
cmd(f"ethtool -L {cfg.ifname} {rx_type} {cur_queue_cnt}")
_check_reconfig(cfg, reconfig)
def check_reconfig_xdp(cfg) -> None:
def reconfig(cfg) -> None:
ip(f"link set dev %s xdp obj %s sec xdp" %
(cfg.ifname, cfg.net_lib_dir / "xdp_dummy.bpf.o"))
ip(f"link set dev %s xdp off" % cfg.ifname)
_check_reconfig(cfg, reconfig)
@ksft_disruptive
def check_down(cfg) -> None:
def reconfig(cfg) -> None:
ip("link set dev %s down" % cfg.ifname)
ip("link set dev %s up" % cfg.ifname)
_check_reconfig(cfg, reconfig)
def main() -> None:
with NetDrvEnv(__file__, nsim_test=False) as cfg:
cfg.ethnl = EthtoolFamily()
cfg.netnl = NetdevFamily()
ksft_run([check_irqs_reported, check_reconfig_queues,
check_reconfig_xdp, check_down],
args=(cfg, ))
ksft_exit()
if __name__ == "__main__":
main()
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