310 lines
8.2 KiB
Python
Executable File
310 lines
8.2 KiB
Python
Executable File
#!/usr/bin/env python3
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# SPDX-License-Identifier: GPL-2.0
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from subprocess import PIPE, Popen
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import json
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import time
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import argparse
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import collections
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import sys
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#
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# Test port split configuration using devlink-port lanes attribute.
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# The test is skipped in case the attribute is not available.
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#
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# First, check that all the ports with 1 lane fail to split.
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# Second, check that all the ports with more than 1 lane can be split
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# to all valid configurations (e.g., split to 2, split to 4 etc.)
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#
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# Kselftest framework requirement - SKIP code is 4
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KSFT_SKIP=4
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Port = collections.namedtuple('Port', 'bus_info name')
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def run_command(cmd, should_fail=False):
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"""
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Run a command in subprocess.
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Return: Tuple of (stdout, stderr).
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"""
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p = Popen(cmd, stdout=PIPE, stderr=PIPE, shell=True)
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stdout, stderr = p.communicate()
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stdout, stderr = stdout.decode(), stderr.decode()
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if stderr != "" and not should_fail:
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print("Error sending command: %s" % cmd)
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print(stdout)
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print(stderr)
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return stdout, stderr
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class devlink_ports(object):
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"""
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Class that holds information on the devlink ports, required to the tests;
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if_names: A list of interfaces in the devlink ports.
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"""
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def get_if_names(dev):
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"""
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Get a list of physical devlink ports.
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Return: Array of tuples (bus_info/port, if_name).
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"""
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arr = []
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cmd = "devlink -j port show"
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stdout, stderr = run_command(cmd)
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assert stderr == ""
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ports = json.loads(stdout)['port']
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validate_devlink_output(ports, 'flavour')
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for port in ports:
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if dev in port:
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if ports[port]['flavour'] == 'physical':
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arr.append(Port(bus_info=port, name=ports[port]['netdev']))
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return arr
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def __init__(self, dev):
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self.if_names = devlink_ports.get_if_names(dev)
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def get_max_lanes(port):
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"""
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Get the $port's maximum number of lanes.
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Return: number of lanes, e.g. 1, 2, 4 and 8.
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"""
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cmd = "devlink -j port show %s" % port
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stdout, stderr = run_command(cmd)
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assert stderr == ""
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values = list(json.loads(stdout)['port'].values())[0]
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if 'lanes' in values:
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lanes = values['lanes']
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else:
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lanes = 0
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return lanes
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def get_split_ability(port):
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"""
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Get the $port split ability.
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Return: split ability, true or false.
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"""
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cmd = "devlink -j port show %s" % port.name
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stdout, stderr = run_command(cmd)
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assert stderr == ""
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values = list(json.loads(stdout)['port'].values())[0]
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return values['splittable']
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def split(k, port, should_fail=False):
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"""
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Split $port into $k ports.
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If should_fail == True, the split should fail. Otherwise, should pass.
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Return: Array of sub ports after splitting.
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If the $port wasn't split, the array will be empty.
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"""
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cmd = "devlink port split %s count %s" % (port.bus_info, k)
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stdout, stderr = run_command(cmd, should_fail=should_fail)
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if should_fail:
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if not test(stderr != "", "%s is unsplittable" % port.name):
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print("split an unsplittable port %s" % port.name)
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return create_split_group(port, k)
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else:
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if stderr == "":
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return create_split_group(port, k)
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print("didn't split a splittable port %s" % port.name)
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return []
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def unsplit(port):
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"""
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Unsplit $port.
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"""
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cmd = "devlink port unsplit %s" % port
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stdout, stderr = run_command(cmd)
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test(stderr == "", "Unsplit port %s" % port)
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def exists(port, dev):
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"""
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Check if $port exists in the devlink ports.
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Return: True is so, False otherwise.
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"""
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return any(dev_port.name == port
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for dev_port in devlink_ports.get_if_names(dev))
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def exists_and_lanes(ports, lanes, dev):
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"""
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Check if every port in the list $ports exists in the devlink ports and has
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$lanes number of lanes after splitting.
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Return: True if both are True, False otherwise.
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"""
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for port in ports:
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max_lanes = get_max_lanes(port)
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if not exists(port, dev):
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print("port %s doesn't exist in devlink ports" % port)
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return False
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if max_lanes != lanes:
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print("port %s has %d lanes, but %s were expected"
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% (port, lanes, max_lanes))
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return False
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return True
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def test(cond, msg):
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"""
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Check $cond and print a message accordingly.
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Return: True is pass, False otherwise.
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"""
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if cond:
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print("TEST: %-60s [ OK ]" % msg)
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else:
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print("TEST: %-60s [FAIL]" % msg)
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return cond
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def create_split_group(port, k):
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"""
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Create the split group for $port.
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Return: Array with $k elements, which are the split port group.
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"""
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return list(port.name + "s" + str(i) for i in range(k))
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def split_unsplittable_port(port, k):
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"""
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Test that splitting of unsplittable port fails.
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"""
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# split to max
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new_split_group = split(k, port, should_fail=True)
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if new_split_group != []:
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unsplit(port.bus_info)
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def split_splittable_port(port, k, lanes, dev):
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"""
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Test that splitting of splittable port passes correctly.
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"""
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new_split_group = split(k, port)
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# Once the split command ends, it takes some time to the sub ifaces'
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# to get their names. Use udevadm to continue only when all current udev
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# events are handled.
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cmd = "udevadm settle"
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stdout, stderr = run_command(cmd)
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assert stderr == ""
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if new_split_group != []:
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test(exists_and_lanes(new_split_group, lanes/k, dev),
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"split port %s into %s" % (port.name, k))
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unsplit(port.bus_info)
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def validate_devlink_output(devlink_data, target_property=None):
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"""
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Determine if test should be skipped by checking:
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1. devlink_data contains values
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2. The target_property exist in devlink_data
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"""
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skip_reason = None
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if any(devlink_data.values()):
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if target_property:
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skip_reason = "{} not found in devlink output, test skipped".format(target_property)
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for key in devlink_data:
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if target_property in devlink_data[key]:
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skip_reason = None
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else:
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skip_reason = 'devlink output is empty, test skipped'
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if skip_reason:
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print(skip_reason)
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sys.exit(KSFT_SKIP)
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def make_parser():
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parser = argparse.ArgumentParser(description='A test for port splitting.')
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parser.add_argument('--dev',
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help='The devlink handle of the device under test. ' +
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'The default is the first registered devlink ' +
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'handle.')
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return parser
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def main(cmdline=None):
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parser = make_parser()
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args = parser.parse_args(cmdline)
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dev = args.dev
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if not dev:
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cmd = "devlink -j dev show"
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stdout, stderr = run_command(cmd)
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assert stderr == ""
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validate_devlink_output(json.loads(stdout))
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devs = json.loads(stdout)['dev']
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dev = list(devs.keys())[0]
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cmd = "devlink dev show %s" % dev
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stdout, stderr = run_command(cmd)
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if stderr != "":
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print("devlink device %s can not be found" % dev)
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sys.exit(1)
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ports = devlink_ports(dev)
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found_max_lanes = False
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for port in ports.if_names:
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max_lanes = get_max_lanes(port.name)
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# If max lanes is 0, do not test port splitting at all
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if max_lanes == 0:
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continue
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# If 1 lane, shouldn't be able to split
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elif max_lanes == 1:
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test(not get_split_ability(port),
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"%s should not be able to split" % port.name)
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split_unsplittable_port(port, max_lanes)
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# Else, splitting should pass and all the split ports should exist.
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else:
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lane = max_lanes
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test(get_split_ability(port),
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"%s should be able to split" % port.name)
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while lane > 1:
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split_splittable_port(port, lane, max_lanes, dev)
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lane //= 2
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found_max_lanes = True
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if not found_max_lanes:
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print(f"Test not started, no port of device {dev} reports max_lanes")
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sys.exit(KSFT_SKIP)
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if __name__ == "__main__":
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main()
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