--- /dev/null
+#!/usr/bin/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.)
+#
+
+
+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']
+ dev = list(devs.keys())[0]
+
+ 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()
projects / linux.git / commitdiff