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#!/usr/bin/env python
# Utility functions for QEMU tests ##
import subprocess
import sys
def can_create_namespaces(namespace="vpp_chk_4212"):
"""Check if the environment allows creating the namespaces"""
try:
result = subprocess.run(["ip", "netns", "add", namespace], capture_output=True)
if result.returncode != 0:
return False
result = subprocess.run(["ip", "netns", "del", namespace], capture_output=True)
if result.returncode != 0:
return False
return True
except Exception:
return False
def create_namespace(ns):
"""create one or more namespaces.
arguments:
ns -- a string value or an iterable of namespace names
"""
if isinstance(ns, str):
namespaces = [ns]
else:
namespaces = ns
try:
for namespace in namespaces:
result = subprocess.run(["ip", "netns", "add", namespace])
if result.returncode != 0:
raise Exception(f"Error while creating namespace {namespace}")
except subprocess.CalledProcessError as e:
raise Exception("Error creating namespace:", e.output)
def add_namespace_route(ns, prefix, gw_ip):
"""Add a route to a namespace.
arguments:
ns -- namespace string value
prefix -- NETWORK/MASK or "default"
gw_ip -- Gateway IP
"""
try:
subprocess.run(
["ip", "netns", "exec", ns, "ip", "route", "add", prefix, "via", gw_ip],
capture_output=True,
)
except subprocess.CalledProcessError as e:
raise Exception("Error adding route to namespace:", e.output)
def delete_host_interfaces(*host_interface_names):
"""Delete host interfaces.
arguments:
host_interface_names - sequence of host interface names to be deleted
"""
for host_interface_name in host_interface_names:
try:
subprocess.run(
["ip", "link", "del", host_interface_name], capture_output=True
)
except subprocess.CalledProcessError as e:
raise Exception("Error deleting host interface:", e.output)
def create_host_interface(
host_interface_name, vpp_interface_name, host_namespace, *host_ip_prefixes
):
"""Create a host interface of type veth.
arguments:
host_interface_name -- name of the veth interface on the host side
vpp_interface_name -- name of the veth interface on the VPP side
host_namespace -- host namespace into which the host_interface needs to be set
host_ip_prefixes -- a sequence of ip/prefix-lengths to be set
on the host_interface
"""
try:
process = subprocess.run(
[
"ip",
"link",
"add",
"name",
vpp_interface_name,
"type",
"veth",
"peer",
"name",
host_interface_name,
],
capture_output=True,
)
if process.returncode != 0:
print(f"Error creating host interface: {process.stderr}")
sys.exit(1)
process = subprocess.run(
["ip", "link", "set", host_interface_name, "netns", host_namespace],
capture_output=True,
)
if process.returncode != 0:
print(f"Error setting host interface namespace: {process.stderr}")
sys.exit(1)
process = subprocess.run(
["ip", "link", "set", "dev", vpp_interface_name, "up"], capture_output=True
)
if process.returncode != 0:
print(f"Error bringing up the host interface: {process.stderr}")
sys.exit(1)
process = subprocess.run(
[
"ip",
"netns",
"exec",
host_namespace,
"ip",
"link",
"set",
"dev",
host_interface_name,
"up",
],
capture_output=True,
)
if process.returncode != 0:
print(
f"Error bringing up the host interface in namespace: "
f"{process.stderr}"
)
sys.exit(1)
for host_ip_prefix in host_ip_prefixes:
process = subprocess.run(
[
"ip",
"netns",
"exec",
host_namespace,
"ip",
"addr",
"add",
host_ip_prefix,
"dev",
host_interface_name,
],
capture_output=True,
)
if process.returncode != 0:
print(
f"Error setting ip prefix on the host interface: "
f"{process.stderr}"
)
sys.exit(1)
except subprocess.CalledProcessError as e:
raise Exception("Error adding route to namespace:", e.output)
def set_interface_mtu(namespace, interface, mtu, logger):
"""set an mtu number on a linux device interface."""
args = ["ip", "link", "set", "mtu", str(mtu), "dev", interface]
if namespace:
args = ["ip", "netns", "exec", namespace] + args
try:
logger.debug(
f"Setting mtu:{mtu} on linux interface:{interface} "
f"in namespace:{namespace}"
)
subprocess.run(args)
except subprocess.CalledProcessError as e:
raise Exception("Error updating mtu:", e.output)
def enable_interface_gso(namespace, interface):
"""enable gso offload on a linux device interface."""
args = ["ethtool", "-K", interface, "rx", "on", "tx", "on"]
if namespace:
args = ["ip", "netns", "exec", namespace] + args
try:
process = subprocess.run(args, capture_output=True)
if process.returncode != 0:
print(
f"Error enabling GSO offload on linux device interface: "
f"{process.stderr}"
)
sys.exit(1)
except subprocess.CalledProcessError as e:
raise Exception("Error enabling gso:", e.output)
def disable_interface_gso(namespace, interface):
"""disable gso offload on a linux device interface."""
args = ["ethtool", "-K", interface, "rx", "off", "tx", "off"]
if namespace:
args = ["ip", "netns", "exec", namespace] + args
try:
process = subprocess.run(args, capture_output=True)
if process.returncode != 0:
print(
f"Error disabling GSO offload on linux device interface: "
f"{process.stderr}"
)
sys.exit(1)
except subprocess.CalledProcessError as e:
raise Exception("Error disabling gso:", e.output)
def delete_namespace(ns):
"""delete one or more namespaces.
arguments:
namespaces -- a list of namespace names
"""
if isinstance(ns, str):
namespaces = [ns]
else:
namespaces = ns
try:
for namespace in namespaces:
result = subprocess.run(
["ip", "netns", "del", namespace], capture_output=True
)
if result.returncode != 0:
raise Exception(f"Error while deleting namespace {namespace}")
except subprocess.CalledProcessError as e:
raise Exception("Error deleting namespace:", e.output)
def list_namespace(ns):
"""List the IP address of a namespace"""
try:
subprocess.run(["ip", "netns", "exec", ns, "ip", "addr"])
except subprocess.CalledProcessError as e:
raise Exception("Error listing namespace IP:", e.output)
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