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# SPDX-License-Identifier: GPL-2.0
import os
import time
from pathlib import Path
from lib.py import KsftSkipEx, KsftXfailEx
from lib.py import cmd, ethtool, ip
from lib.py import NetNS, NetdevSimDev
from .remote import Remote
def _load_env_file(src_path):
env = os.environ.copy()
src_dir = Path(src_path).parent.resolve()
if not (src_dir / "net.config").exists():
return env
with open((src_dir / "net.config").as_posix(), 'r') as fp:
for line in fp.readlines():
full_file = line
# Strip comments
pos = line.find("#")
if pos >= 0:
line = line[:pos]
line = line.strip()
if not line:
continue
pair = line.split('=', maxsplit=1)
if len(pair) != 2:
raise Exception("Can't parse configuration line:", full_file)
env[pair[0]] = pair[1]
return env
class NetDrvEnv:
"""
Class for a single NIC / host env, with no remote end
"""
def __init__(self, src_path, **kwargs):
self._ns = None
self.env = _load_env_file(src_path)
if 'NETIF' in self.env:
self.dev = ip("link show dev " + self.env['NETIF'], json=True)[0]
else:
self._ns = NetdevSimDev(**kwargs)
self.dev = self._ns.nsims[0].dev
self.ifindex = self.dev['ifindex']
def __enter__(self):
ip(f"link set dev {self.dev['ifname']} up")
return self
def __exit__(self, ex_type, ex_value, ex_tb):
"""
__exit__ gets called at the end of a "with" block.
"""
self.__del__()
def __del__(self):
if self._ns:
self._ns.remove()
self._ns = None
class NetDrvEpEnv:
"""
Class for an environment with a local device and "remote endpoint"
which can be used to send traffic in.
For local testing it creates two network namespaces and a pair
of netdevsim devices.
"""
# Network prefixes used for local tests
nsim_v4_pfx = "192.0.2."
nsim_v6_pfx = "2001:db8::"
def __init__(self, src_path, nsim_test=None):
self.env = _load_env_file(src_path)
self._stats_settle_time = None
# Things we try to destroy
self.remote = None
# These are for local testing state
self._netns = None
self._ns = None
self._ns_peer = None
if "NETIF" in self.env:
if nsim_test is True:
raise KsftXfailEx("Test only works on netdevsim")
self._check_env()
self.dev = ip("link show dev " + self.env['NETIF'], json=True)[0]
self.v4 = self.env.get("LOCAL_V4")
self.v6 = self.env.get("LOCAL_V6")
self.remote_v4 = self.env.get("REMOTE_V4")
self.remote_v6 = self.env.get("REMOTE_V6")
kind = self.env["REMOTE_TYPE"]
args = self.env["REMOTE_ARGS"]
else:
if nsim_test is False:
raise KsftXfailEx("Test does not work on netdevsim")
self.create_local()
self.dev = self._ns.nsims[0].dev
self.v4 = self.nsim_v4_pfx + "1"
self.v6 = self.nsim_v6_pfx + "1"
self.remote_v4 = self.nsim_v4_pfx + "2"
self.remote_v6 = self.nsim_v6_pfx + "2"
kind = "netns"
args = self._netns.name
self.remote = Remote(kind, args, src_path)
self.addr = self.v6 if self.v6 else self.v4
self.remote_addr = self.remote_v6 if self.remote_v6 else self.remote_v4
self.addr_ipver = "6" if self.v6 else "4"
# Bracketed addresses, some commands need IPv6 to be inside []
self.baddr = f"[{self.v6}]" if self.v6 else self.v4
self.remote_baddr = f"[{self.remote_v6}]" if self.remote_v6 else self.remote_v4
self.ifname = self.dev['ifname']
self.ifindex = self.dev['ifindex']
self._required_cmd = {}
def create_local(self):
self._netns = NetNS()
self._ns = NetdevSimDev()
self._ns_peer = NetdevSimDev(ns=self._netns)
with open("/proc/self/ns/net") as nsfd0, \
open("/var/run/netns/" + self._netns.name) as nsfd1:
ifi0 = self._ns.nsims[0].ifindex
ifi1 = self._ns_peer.nsims[0].ifindex
NetdevSimDev.ctrl_write('link_device',
f'{nsfd0.fileno()}:{ifi0} {nsfd1.fileno()}:{ifi1}')
ip(f" addr add dev {self._ns.nsims[0].ifname} {self.nsim_v4_pfx}1/24")
ip(f"-6 addr add dev {self._ns.nsims[0].ifname} {self.nsim_v6_pfx}1/64 nodad")
ip(f" link set dev {self._ns.nsims[0].ifname} up")
ip(f" addr add dev {self._ns_peer.nsims[0].ifname} {self.nsim_v4_pfx}2/24", ns=self._netns)
ip(f"-6 addr add dev {self._ns_peer.nsims[0].ifname} {self.nsim_v6_pfx}2/64 nodad", ns=self._netns)
ip(f" link set dev {self._ns_peer.nsims[0].ifname} up", ns=self._netns)
def _check_env(self):
vars_needed = [
["LOCAL_V4", "LOCAL_V6"],
["REMOTE_V4", "REMOTE_V6"],
["REMOTE_TYPE"],
["REMOTE_ARGS"]
]
missing = []
for choice in vars_needed:
for entry in choice:
if entry in self.env:
break
else:
missing.append(choice)
# Make sure v4 / v6 configs are symmetric
if ("LOCAL_V6" in self.env) != ("REMOTE_V6" in self.env):
missing.append(["LOCAL_V6", "REMOTE_V6"])
if ("LOCAL_V4" in self.env) != ("REMOTE_V4" in self.env):
missing.append(["LOCAL_V4", "REMOTE_V4"])
if missing:
raise Exception("Invalid environment, missing configuration:", missing,
"Please see tools/testing/selftests/drivers/net/README.rst")
def __enter__(self):
return self
def __exit__(self, ex_type, ex_value, ex_tb):
"""
__exit__ gets called at the end of a "with" block.
"""
self.__del__()
def __del__(self):
if self._ns:
self._ns.remove()
self._ns = None
if self._ns_peer:
self._ns_peer.remove()
self._ns_peer = None
if self._netns:
del self._netns
self._netns = None
if self.remote:
del self.remote
self.remote = None
def require_v4(self):
if not self.v4 or not self.remote_v4:
raise KsftSkipEx("Test requires IPv4 connectivity")
def require_v6(self):
if not self.v6 or not self.remote_v6:
raise KsftSkipEx("Test requires IPv6 connectivity")
def _require_cmd(self, comm, key, host=None):
cached = self._required_cmd.get(comm, {})
if cached.get(key) is None:
cached[key] = cmd("command -v -- " + comm, fail=False,
shell=True, host=host).ret == 0
self._required_cmd[comm] = cached
return cached[key]
def require_cmd(self, comm, local=True, remote=False):
if local:
if not self._require_cmd(comm, "local"):
raise KsftSkipEx("Test requires command: " + comm)
if remote:
if not self._require_cmd(comm, "remote"):
raise KsftSkipEx("Test requires (remote) command: " + comm)
def wait_hw_stats_settle(self):
"""
Wait for HW stats to become consistent, some devices DMA HW stats
periodically so events won't be reflected until next sync.
Good drivers will tell us via ethtool what their sync period is.
"""
if self._stats_settle_time is None:
data = ethtool("-c " + self.ifname, json=True)[0]
self._stats_settle_time = 0.025 + \
data.get('stats-block-usecs', 0) / 1000 / 1000
time.sleep(self._stats_settle_time)
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