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