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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 ksft_setup, wait_file
from lib.py import cmd, ethtool, ip, CmdExitFailure
from lib.py import NetNS, NetdevSimDev
from .remote import Remote
class NetDrvEnvBase:
"""
Base class for a NIC / host environments
Attributes:
test_dir: Path to the source directory of the test
net_lib_dir: Path to the net/lib directory
"""
def __init__(self, src_path):
self.src_path = Path(src_path)
self.test_dir = self.src_path.parent.resolve()
self.net_lib_dir = (Path(__file__).parent / "../../../../net/lib").resolve()
self.env = self._load_env_file()
# Following attrs must be set be inheriting classes
self.dev = None
def _load_env_file(self):
env = os.environ.copy()
src_dir = Path(self.src_path).parent.resolve()
if not (src_dir / "net.config").exists():
return ksft_setup(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 ksft_setup(env)
def __del__(self):
pass
def __enter__(self):
ip(f"link set dev {self.dev['ifname']} up")
wait_file(f"/sys/class/net/{self.dev['ifname']}/carrier",
lambda x: x.strip() == "1")
return self
def __exit__(self, ex_type, ex_value, ex_tb):
"""
__exit__ gets called at the end of a "with" block.
"""
self.__del__()
class NetDrvEnv(NetDrvEnvBase):
"""
Class for a single NIC / host env, with no remote end
"""
def __init__(self, src_path, nsim_test=None, **kwargs):
super().__init__(src_path)
self._ns = None
if 'NETIF' in self.env:
if nsim_test is True:
raise KsftXfailEx("Test only works on netdevsim")
self.dev = ip("-d link show dev " + self.env['NETIF'], json=True)[0]
else:
if nsim_test is False:
raise KsftXfailEx("Test does not work on netdevsim")
self._ns = NetdevSimDev(**kwargs)
self.dev = self._ns.nsims[0].dev
self.ifname = self.dev['ifname']
self.ifindex = self.dev['ifindex']
def __del__(self):
if self._ns:
self._ns.remove()
self._ns = None
class NetDrvEpEnv(NetDrvEnvBase):
"""
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):
super().__init__(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
self.addr_v = { "4": None, "6": None }
self.remote_addr_v = { "4": None, "6": None }
if "NETIF" in self.env:
if nsim_test is True:
raise KsftXfailEx("Test only works on netdevsim")
self._check_env()
self.dev = ip("-d link show dev " + self.env['NETIF'], json=True)[0]
self.addr_v["4"] = self.env.get("LOCAL_V4")
self.addr_v["6"] = self.env.get("LOCAL_V6")
self.remote_addr_v["4"] = self.env.get("REMOTE_V4")
self.remote_addr_v["6"] = 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.addr_v["4"] = self.nsim_v4_pfx + "1"
self.addr_v["6"] = self.nsim_v6_pfx + "1"
self.remote_addr_v["4"] = self.nsim_v4_pfx + "2"
self.remote_addr_v["6"] = self.nsim_v6_pfx + "2"
kind = "netns"
args = self._netns.name
self.remote = Remote(kind, args, src_path)
self.addr_ipver = "6" if self.addr_v["6"] else "4"
self.addr = self.addr_v[self.addr_ipver]
self.remote_addr = self.remote_addr_v[self.addr_ipver]
# Bracketed addresses, some commands need IPv6 to be inside []
self.baddr = f"[{self.addr_v['6']}]" if self.addr_v["6"] else self.addr_v["4"]
self.remote_baddr = f"[{self.remote_addr_v['6']}]" if self.remote_addr_v["6"] else self.remote_addr_v["4"]
self.ifname = self.dev['ifname']
self.ifindex = self.dev['ifindex']
# resolve remote interface name
self.remote_ifname = self.resolve_remote_ifc()
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 resolve_remote_ifc(self):
v4 = v6 = None
if self.remote_addr_v["4"]:
v4 = ip("addr show to " + self.remote_addr_v["4"], json=True, host=self.remote)
if self.remote_addr_v["6"]:
v6 = ip("addr show to " + self.remote_addr_v["6"], json=True, host=self.remote)
if v4 and v6 and v4[0]["ifname"] != v6[0]["ifname"]:
raise Exception("Can't resolve remote interface name, v4 and v6 don't match")
if (v4 and len(v4) > 1) or (v6 and len(v6) > 1):
raise Exception("Can't resolve remote interface name, multiple interfaces match")
return v6[0]["ifname"] if v6 else v4[0]["ifname"]
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_ipver(self, ipver):
if not self.addr_v[ipver] or not self.remote_addr_v[ipver]:
raise KsftSkipEx(f"Test requires IPv{ipver} 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", host=self.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 = {}
try:
data = ethtool("-c " + self.ifname, json=True)[0]
except CmdExitFailure as e:
if "Operation not supported" not in e.cmd.stderr:
raise
self._stats_settle_time = 0.025 + \
data.get('stats-block-usecs', 0) / 1000 / 1000
time.sleep(self._stats_settle_time)
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