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1#!/usr/bin/env python3
2# SPDX-License-Identifier: GPL-2.0
3
4from subprocess import PIPE, Popen
5import json
6import time
7import argparse
8import collections
9import sys
10
11#
12# Test port split configuration using devlink-port lanes attribute.
13# The test is skipped in case the attribute is not available.
14#
15# First, check that all the ports with 1 lane fail to split.
16# Second, check that all the ports with more than 1 lane can be split
17# to all valid configurations (e.g., split to 2, split to 4 etc.)
18#
19
20
21# Kselftest framework requirement - SKIP code is 4
22KSFT_SKIP=4
23Port = collections.namedtuple('Port', 'bus_info name')
24
25
26def run_command(cmd, should_fail=False):
27 """
28 Run a command in subprocess.
29 Return: Tuple of (stdout, stderr).
30 """
31
32 p = Popen(cmd, stdout=PIPE, stderr=PIPE, shell=True)
33 stdout, stderr = p.communicate()
34 stdout, stderr = stdout.decode(), stderr.decode()
35
36 if stderr != "" and not should_fail:
37 print("Error sending command: %s" % cmd)
38 print(stdout)
39 print(stderr)
40 return stdout, stderr
41
42
43class devlink_ports(object):
44 """
45 Class that holds information on the devlink ports, required to the tests;
46 if_names: A list of interfaces in the devlink ports.
47 """
48
49 def get_if_names(dev):
50 """
51 Get a list of physical devlink ports.
52 Return: Array of tuples (bus_info/port, if_name).
53 """
54
55 arr = []
56
57 cmd = "devlink -j port show"
58 stdout, stderr = run_command(cmd)
59 assert stderr == ""
60 ports = json.loads(stdout)['port']
61
62 validate_devlink_output(ports, 'flavour')
63
64 for port in ports:
65 if dev in port:
66 if ports[port]['flavour'] == 'physical':
67 arr.append(Port(bus_info=port, name=ports[port]['netdev']))
68
69 return arr
70
71 def __init__(self, dev):
72 self.if_names = devlink_ports.get_if_names(dev)
73
74
75def get_max_lanes(port):
76 """
77 Get the $port's maximum number of lanes.
78 Return: number of lanes, e.g. 1, 2, 4 and 8.
79 """
80
81 cmd = "devlink -j port show %s" % port
82 stdout, stderr = run_command(cmd)
83 assert stderr == ""
84 values = list(json.loads(stdout)['port'].values())[0]
85
86 if 'lanes' in values:
87 lanes = values['lanes']
88 else:
89 lanes = 0
90 return lanes
91
92
93def get_split_ability(port):
94 """
95 Get the $port split ability.
96 Return: split ability, true or false.
97 """
98
99 cmd = "devlink -j port show %s" % port.name
100 stdout, stderr = run_command(cmd)
101 assert stderr == ""
102 values = list(json.loads(stdout)['port'].values())[0]
103
104 return values['splittable']
105
106
107def split(k, port, should_fail=False):
108 """
109 Split $port into $k ports.
110 If should_fail == True, the split should fail. Otherwise, should pass.
111 Return: Array of sub ports after splitting.
112 If the $port wasn't split, the array will be empty.
113 """
114
115 cmd = "devlink port split %s count %s" % (port.bus_info, k)
116 stdout, stderr = run_command(cmd, should_fail=should_fail)
117
118 if should_fail:
119 if not test(stderr != "", "%s is unsplittable" % port.name):
120 print("split an unsplittable port %s" % port.name)
121 return create_split_group(port, k)
122 else:
123 if stderr == "":
124 return create_split_group(port, k)
125 print("didn't split a splittable port %s" % port.name)
126
127 return []
128
129
130def unsplit(port):
131 """
132 Unsplit $port.
133 """
134
135 cmd = "devlink port unsplit %s" % port
136 stdout, stderr = run_command(cmd)
137 test(stderr == "", "Unsplit port %s" % port)
138
139
140def exists(port, dev):
141 """
142 Check if $port exists in the devlink ports.
143 Return: True is so, False otherwise.
144 """
145
146 return any(dev_port.name == port
147 for dev_port in devlink_ports.get_if_names(dev))
148
149
150def exists_and_lanes(ports, lanes, dev):
151 """
152 Check if every port in the list $ports exists in the devlink ports and has
153 $lanes number of lanes after splitting.
154 Return: True if both are True, False otherwise.
155 """
156
157 for port in ports:
158 max_lanes = get_max_lanes(port)
159 if not exists(port, dev):
160 print("port %s doesn't exist in devlink ports" % port)
161 return False
162 if max_lanes != lanes:
163 print("port %s has %d lanes, but %s were expected"
164 % (port, lanes, max_lanes))
165 return False
166 return True
167
168
169def test(cond, msg):
170 """
171 Check $cond and print a message accordingly.
172 Return: True is pass, False otherwise.
173 """
174
175 if cond:
176 print("TEST: %-60s [ OK ]" % msg)
177 else:
178 print("TEST: %-60s [FAIL]" % msg)
179
180 return cond
181
182
183def create_split_group(port, k):
184 """
185 Create the split group for $port.
186 Return: Array with $k elements, which are the split port group.
187 """
188
189 return list(port.name + "s" + str(i) for i in range(k))
190
191
192def split_unsplittable_port(port, k):
193 """
194 Test that splitting of unsplittable port fails.
195 """
196
197 # split to max
198 new_split_group = split(k, port, should_fail=True)
199
200 if new_split_group != []:
201 unsplit(port.bus_info)
202
203
204def split_splittable_port(port, k, lanes, dev):
205 """
206 Test that splitting of splittable port passes correctly.
207 """
208
209 new_split_group = split(k, port)
210
211 # Once the split command ends, it takes some time to the sub ifaces'
212 # to get their names. Use udevadm to continue only when all current udev
213 # events are handled.
214 cmd = "udevadm settle"
215 stdout, stderr = run_command(cmd)
216 assert stderr == ""
217
218 if new_split_group != []:
219 test(exists_and_lanes(new_split_group, lanes/k, dev),
220 "split port %s into %s" % (port.name, k))
221
222 unsplit(port.bus_info)
223
224
225def validate_devlink_output(devlink_data, target_property=None):
226 """
227 Determine if test should be skipped by checking:
228 1. devlink_data contains values
229 2. The target_property exist in devlink_data
230 """
231 skip_reason = None
232 if any(devlink_data.values()):
233 if target_property:
234 skip_reason = "{} not found in devlink output, test skipped".format(target_property)
235 for key in devlink_data:
236 if target_property in devlink_data[key]:
237 skip_reason = None
238 else:
239 skip_reason = 'devlink output is empty, test skipped'
240
241 if skip_reason:
242 print(skip_reason)
243 sys.exit(KSFT_SKIP)
244
245
246def make_parser():
247 parser = argparse.ArgumentParser(description='A test for port splitting.')
248 parser.add_argument('--dev',
249 help='The devlink handle of the device under test. ' +
250 'The default is the first registered devlink ' +
251 'handle.')
252
253 return parser
254
255
256def main(cmdline=None):
257 parser = make_parser()
258 args = parser.parse_args(cmdline)
259
260 dev = args.dev
261 if not dev:
262 cmd = "devlink -j dev show"
263 stdout, stderr = run_command(cmd)
264 assert stderr == ""
265
266 validate_devlink_output(json.loads(stdout))
267 devs = json.loads(stdout)['dev']
268 dev = list(devs.keys())[0]
269
270 cmd = "devlink dev show %s" % dev
271 stdout, stderr = run_command(cmd)
272 if stderr != "":
273 print("devlink device %s can not be found" % dev)
274 sys.exit(1)
275
276 ports = devlink_ports(dev)
277
278 found_max_lanes = False
279 for port in ports.if_names:
280 max_lanes = get_max_lanes(port.name)
281
282 # If max lanes is 0, do not test port splitting at all
283 if max_lanes == 0:
284 continue
285
286 # If 1 lane, shouldn't be able to split
287 elif max_lanes == 1:
288 test(not get_split_ability(port),
289 "%s should not be able to split" % port.name)
290 split_unsplittable_port(port, max_lanes)
291
292 # Else, splitting should pass and all the split ports should exist.
293 else:
294 lane = max_lanes
295 test(get_split_ability(port),
296 "%s should be able to split" % port.name)
297 while lane > 1:
298 split_splittable_port(port, lane, max_lanes, dev)
299
300 lane //= 2
301 found_max_lanes = True
302
303 if not found_max_lanes:
304 print(f"Test not started, no port of device {dev} reports max_lanes")
305 sys.exit(KSFT_SKIP)
306
307
308if __name__ == "__main__":
309 main()