[PATCH net-next 0/6] selftests: tc-testing: more updates to tdc

[PATCH net-next 0/6] selftests: tc-testing: more updates to tdc

[Pedro Tammela]

Address the issues making tdc timeout on downstream CIs like lkp and
tuxsuite.

Pedro Tammela (6):
  selftests: tc-testing: cap parallel tdc to 4 cores
  selftests: tc-testing: move back to per test ns setup
  selftests: tc-testing: use netns delete from pyroute2
  selftests: tc-testing: leverage -all in suite ns teardown
  selftests: tc-testing: timeout on unbounded loops
  selftests: tc-testing: report number of workers in use

 .../tc-testing/plugin-lib/nsPlugin.py         | 98 +++++++++----------
 tools/testing/selftests/tc-testing/tdc.py     |  3 +-
 2 files changed, 51 insertions(+), 50 deletions(-)

-- 
2.40.1

[PATCH net-next 1/6] selftests: tc-testing: cap parallel tdc to 4 cores

[Pedro Tammela]

We have observed a lot of lock contention and test instability when running with >8 cores.
Enough to actually make the tests run slower than with fewer cores.

Cap the maximum cores of parallel tdc to 4 which showed in testing to
be a reasonable number for efficiency and stability in different kernel
config scenarios.

Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>
---
 tools/testing/selftests/tc-testing/tdc.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/testing/selftests/tc-testing/tdc.py b/tools/testing/selftests/tc-testing/tdc.py
index a6718192aff3..f764b43f112b 100755
--- a/tools/testing/selftests/tc-testing/tdc.py
+++ b/tools/testing/selftests/tc-testing/tdc.py
@@ -1017,6 +1017,7 @@ def main():
     parser = pm.call_add_args(parser)
     (args, remaining) = parser.parse_known_args()
     args.NAMES = NAMES
+    args.mp = min(args.mp, 4)
     pm.set_args(args)
     check_default_settings(args, remaining, pm)
     if args.verbose > 2:
-- 
2.40.1

[PATCH net-next 2/6] selftests: tc-testing: move back to per test ns setup

[Pedro Tammela]

Surprisingly in kernel configs with most of the debug knobs turned on,
pre-allocating the test resources makes tdc run much slower overall than
when allocating resources on a per test basis.

As these knobs are used in kselftests in downstream CIs, let's go back
to the old way of doing things to avoid kselftests timeouts.

Reported-by: kernel test robot <oliver.sang@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202311161129.3b45ed53-oliver.sang@intel.com
Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>
---
 .../tc-testing/plugin-lib/nsPlugin.py         | 68 +++++++------------
 1 file changed, 25 insertions(+), 43 deletions(-)

diff --git a/tools/testing/selftests/tc-testing/plugin-lib/nsPlugin.py b/tools/testing/selftests/tc-testing/plugin-lib/nsPlugin.py
index 62974bd3a4a5..2b8cbfdf1083 100644
--- a/tools/testing/selftests/tc-testing/plugin-lib/nsPlugin.py
+++ b/tools/testing/selftests/tc-testing/plugin-lib/nsPlugin.py
@@ -17,44 +17,6 @@ except ImportError:
     netlink = False
     print("!!! Consider installing pyroute2 !!!")
 
-def prepare_suite(obj, test):
-    original = obj.args.NAMES
-
-    if 'skip' in test and test['skip'] == 'yes':
-        return
-
-    if 'nsPlugin' not in test['plugins']:
-        return
-
-    shadow = {}
-    shadow['IP'] = original['IP']
-    shadow['TC'] = original['TC']
-    shadow['NS'] = '{}-{}'.format(original['NS'], test['random'])
-    shadow['DEV0'] = '{}id{}'.format(original['DEV0'], test['id'])
-    shadow['DEV1'] = '{}id{}'.format(original['DEV1'], test['id'])
-    shadow['DUMMY'] = '{}id{}'.format(original['DUMMY'], test['id'])
-    shadow['DEV2'] = original['DEV2']
-    obj.args.NAMES = shadow
-
-    if netlink == True:
-        obj._nl_ns_create()
-    else:
-        obj._ns_create()
-
-    # Make sure the netns is visible in the fs
-    while True:
-        obj._proc_check()
-        try:
-            ns = obj.args.NAMES['NS']
-            f = open('/run/netns/{}'.format(ns))
-            f.close()
-            break
-        except:
-            time.sleep(0.1)
-            continue
-
-    obj.args.NAMES = original
-
 class SubPlugin(TdcPlugin):
     def __init__(self):
         self.sub_class = 'ns/SubPlugin'
@@ -65,19 +27,39 @@ class SubPlugin(TdcPlugin):
 
         super().pre_suite(testcount, testlist)
 
-        print("Setting up namespaces and devices...")
+    def prepare_test(self, test):
+        if 'skip' in test and test['skip'] == 'yes':
+            return
 
-        with Pool(self.args.mp) as p:
-            it = zip(cycle([self]), testlist)
-            p.starmap(prepare_suite, it)
+        if 'nsPlugin' not in test['plugins']:
+            return
 
-    def pre_case(self, caseinfo, test_skip):
+        if netlink == True:
+            self._nl_ns_create()
+        else:
+            self._ns_create()
+
+        # Make sure the netns is visible in the fs
+        while True:
+            self._proc_check()
+            try:
+                ns = self.args.NAMES['NS']
+                f = open('/run/netns/{}'.format(ns))
+                f.close()
+                break
+            except:
+                time.sleep(0.1)
+                continue
+
+    def pre_case(self, test, test_skip):
         if self.args.verbose:
             print('{}.pre_case'.format(self.sub_class))
 
         if test_skip:
             return
 
+        self.prepare_test(test)
+
     def post_case(self):
         if self.args.verbose:
             print('{}.post_case'.format(self.sub_class))
-- 
2.40.1

[PATCH net-next 3/6] selftests: tc-testing: use netns delete from pyroute2

[Pedro Tammela]

When pyroute2 is available, use the native netns delete routine instead
of calling iproute2 to do it. As forks are expensive with some kernel
configs, minimize its usage to avoid kselftests timeouts.

Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>
---
 .../testing/selftests/tc-testing/plugin-lib/nsPlugin.py  | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/tc-testing/plugin-lib/nsPlugin.py b/tools/testing/selftests/tc-testing/plugin-lib/nsPlugin.py
index 2b8cbfdf1083..920dcbedc395 100644
--- a/tools/testing/selftests/tc-testing/plugin-lib/nsPlugin.py
+++ b/tools/testing/selftests/tc-testing/plugin-lib/nsPlugin.py
@@ -64,7 +64,10 @@ class SubPlugin(TdcPlugin):
         if self.args.verbose:
             print('{}.post_case'.format(self.sub_class))
 
-        self._ns_destroy()
+        if netlink == True:
+            self._nl_ns_destroy()
+        else:
+            self._ns_destroy()
 
     def post_suite(self, index):
         if self.args.verbose:
@@ -174,6 +177,10 @@ class SubPlugin(TdcPlugin):
         '''
         self._exec_cmd_batched('pre', self._ns_create_cmds())
 
+    def _nl_ns_destroy(self):
+        ns = self.args.NAMES['NS']
+        netns.remove(ns)
+
     def _ns_destroy_cmd(self):
         return self._replace_keywords('netns delete {}'.format(self.args.NAMES['NS']))
 
-- 
2.40.1

[PATCH net-next 4/6] selftests: tc-testing: leverage -all in suite ns teardown

[Pedro Tammela]

Instead of listing lingering ns pinned files and delete them one by one, leverage '-all'
from iproute2 to do it in a single process fork.

Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>
---
 .../testing/selftests/tc-testing/plugin-lib/nsPlugin.py  | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/tc-testing/plugin-lib/nsPlugin.py b/tools/testing/selftests/tc-testing/plugin-lib/nsPlugin.py
index 920dcbedc395..7b674befceec 100644
--- a/tools/testing/selftests/tc-testing/plugin-lib/nsPlugin.py
+++ b/tools/testing/selftests/tc-testing/plugin-lib/nsPlugin.py
@@ -74,13 +74,12 @@ class SubPlugin(TdcPlugin):
             print('{}.post_suite'.format(self.sub_class))
 
         # Make sure we don't leak resources
-        for f in os.listdir('/run/netns/'):
-            cmd = self._replace_keywords("$IP netns del {}".format(f))
+        cmd = "$IP -a netns del"
 
-            if self.args.verbose > 3:
-                print('_exec_cmd:  command "{}"'.format(cmd))
+        if self.args.verbose > 3:
+            print('_exec_cmd:  command "{}"'.format(cmd))
 
-            subprocess.run(cmd, shell=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+        subprocess.run(cmd, shell=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
 
     def adjust_command(self, stage, command):
         super().adjust_command(stage, command)
-- 
2.40.1

[PATCH net-next 5/6] selftests: tc-testing: timeout on unbounded loops

[Pedro Tammela]

In the spirit of failing early, timeout on unbounded loops that take
longer than 20 ticks to complete. Such loops are to ensure that objects
created are already visible so tests can proceed without any issues.

If a test setup takes more than 20 ticks to see an object, there's
definetely something wrong.

Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>
---
 .../selftests/tc-testing/plugin-lib/nsPlugin.py      | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/tools/testing/selftests/tc-testing/plugin-lib/nsPlugin.py b/tools/testing/selftests/tc-testing/plugin-lib/nsPlugin.py
index 7b674befceec..65c8f3f983b9 100644
--- a/tools/testing/selftests/tc-testing/plugin-lib/nsPlugin.py
+++ b/tools/testing/selftests/tc-testing/plugin-lib/nsPlugin.py
@@ -40,7 +40,10 @@ class SubPlugin(TdcPlugin):
             self._ns_create()
 
         # Make sure the netns is visible in the fs
+        ticks = 20
         while True:
+            if ticks == 0:
+                raise TimeoutError
             self._proc_check()
             try:
                 ns = self.args.NAMES['NS']
@@ -49,6 +52,7 @@ class SubPlugin(TdcPlugin):
                 break
             except:
                 time.sleep(0.1)
+                ticks -= 1
                 continue
 
     def pre_case(self, test, test_skip):
@@ -127,7 +131,10 @@ class SubPlugin(TdcPlugin):
         with IPRoute() as ip:
             ip.link('add', ifname=dev1, kind='veth', peer={'ifname': dev0, 'net_ns_fd':'/proc/1/ns/net'})
             ip.link('add', ifname=dummy, kind='dummy')
+            ticks = 20
             while True:
+                if ticks == 0:
+                    raise TimeoutError
                 try:
                     dev1_idx = ip.link_lookup(ifname=dev1)[0]
                     dummy_idx = ip.link_lookup(ifname=dummy)[0]
@@ -136,17 +143,22 @@ class SubPlugin(TdcPlugin):
                     break
                 except:
                     time.sleep(0.1)
+                    ticks -= 1
                     continue
         netns.popns()
 
         with IPRoute() as ip:
+            ticks = 20
             while True:
+                if ticks == 0:
+                    raise TimeoutError
                 try:
                     dev0_idx = ip.link_lookup(ifname=dev0)[0]
                     ip.link('set', index=dev0_idx, state='up')
                     break
                 except:
                     time.sleep(0.1)
+                    ticks -= 1
                     continue
 
     def _ns_create_cmds(self):
-- 
2.40.1

[PATCH net-next 6/6] selftests: tc-testing: report number of workers in use

[Pedro Tammela]

Report the number of workers in use to process the test batches.
Since the number is now subject to a limit, avoid users getting
confused.

Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>
---
 tools/testing/selftests/tc-testing/tdc.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/tc-testing/tdc.py b/tools/testing/selftests/tc-testing/tdc.py
index f764b43f112b..669ec89ebfe1 100755
--- a/tools/testing/selftests/tc-testing/tdc.py
+++ b/tools/testing/selftests/tc-testing/tdc.py
@@ -616,7 +616,7 @@ def test_runner_mp(pm, args, alltests):
     batches.insert(0, serial)
 
     print("Executing {} tests in parallel and {} in serial".format(len(parallel), len(serial)))
-    print("Using {} batches".format(len(batches)))
+    print("Using {} batches and {} workers".format(len(batches), args.mp))
 
     # We can't pickle these objects so workaround them
     global mp_pm
-- 
2.40.1

Re: [PATCH net-next 0/6] selftests: tc-testing: more updates to tdc

[Jamal Hadi Salim]

On Fri, Nov 17, 2023 at 12:12 PM Pedro Tammela <pctammela@mojatatu.com> wrote:
>
> Address the issues making tdc timeout on downstream CIs like lkp and
> tuxsuite.
>
> Pedro Tammela (6):
>   selftests: tc-testing: cap parallel tdc to 4 cores
>   selftests: tc-testing: move back to per test ns setup
>   selftests: tc-testing: use netns delete from pyroute2
>   selftests: tc-testing: leverage -all in suite ns teardown
>   selftests: tc-testing: timeout on unbounded loops
>   selftests: tc-testing: report number of workers in use
>
>  .../tc-testing/plugin-lib/nsPlugin.py         | 98 +++++++++----------
>  tools/testing/selftests/tc-testing/tdc.py     |  3 +-
>  2 files changed, 51 insertions(+), 50 deletions(-)

For the series:
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>

cheers,
jamal
> --
> 2.40.1
>

Re: [PATCH net-next 3/6] selftests: tc-testing: use netns delete from pyroute2

[Simon Horman]

On Fri, Nov 17, 2023 at 02:12:05PM -0300, Pedro Tammela wrote:
> When pyroute2 is available, use the native netns delete routine instead
> of calling iproute2 to do it. As forks are expensive with some kernel
> configs, minimize its usage to avoid kselftests timeouts.
> 
> Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>

I have a suggestion for a follow up below, but this change looks good to me.

Reviewed-by: Simon Horman <horms@kernel.org>

> ---
>  .../testing/selftests/tc-testing/plugin-lib/nsPlugin.py  | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/tc-testing/plugin-lib/nsPlugin.py b/tools/testing/selftests/tc-testing/plugin-lib/nsPlugin.py
> index 2b8cbfdf1083..920dcbedc395 100644
> --- a/tools/testing/selftests/tc-testing/plugin-lib/nsPlugin.py
> +++ b/tools/testing/selftests/tc-testing/plugin-lib/nsPlugin.py
> @@ -64,7 +64,10 @@ class SubPlugin(TdcPlugin):
>          if self.args.verbose:
>              print('{}.post_case'.format(self.sub_class))
>  
> -        self._ns_destroy()
> +        if netlink == True:
> +            self._nl_ns_destroy()
> +        else:
> +            self._ns_destroy()

As an aside, I think it would to rename _ns_* to
_iproute2_ns_* or similar, to make the distinction with _nl_ns_* clearer.

>  
>      def post_suite(self, index):
>          if self.args.verbose:
> @@ -174,6 +177,10 @@ class SubPlugin(TdcPlugin):
>          '''
>          self._exec_cmd_batched('pre', self._ns_create_cmds())
>  
> +    def _nl_ns_destroy(self):
> +        ns = self.args.NAMES['NS']
> +        netns.remove(ns)
> +
>      def _ns_destroy_cmd(self):
>          return self._replace_keywords('netns delete {}'.format(self.args.NAMES['NS']))
>  
> -- 
> 2.40.1
> 

Re: [PATCH net-next 5/6] selftests: tc-testing: timeout on unbounded loops

[Simon Horman]

On Fri, Nov 17, 2023 at 02:12:07PM -0300, Pedro Tammela wrote:
> In the spirit of failing early, timeout on unbounded loops that take
> longer than 20 ticks to complete. Such loops are to ensure that objects
> created are already visible so tests can proceed without any issues.
> 
> If a test setup takes more than 20 ticks to see an object, there's
> definetely something wrong.
> 
> Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>

Hi Pedro,

no need to respin because of this, but 'definitely' is misspelt above.

Moving on, I am very pleased to see these loops become bounded in time.
So the above nit notwithstanding,

Reviewed-by: Simon Horman <horms@kernel.org>

...

Re: [PATCH net-next 1/6] selftests: tc-testing: cap parallel tdc to 4 cores

[Simon Horman]

On Fri, Nov 17, 2023 at 02:12:03PM -0300, Pedro Tammela wrote:
> We have observed a lot of lock contention and test instability when running with >8 cores.
> Enough to actually make the tests run slower than with fewer cores.
> 
> Cap the maximum cores of parallel tdc to 4 which showed in testing to
> be a reasonable number for efficiency and stability in different kernel
> config scenarios.
> 
> Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>

Hi Pedro,

This limit seems a bit unfortunate, because it seems dependent on
hardware and software details that are subject to change. Meanwhile
this patch will be long since forgotten. But, OTOH, I can't think of
a better idea at this time, so:

Reviewed-by: Simon Horman <horms@kernel.org>

...

Re: [PATCH net-next 2/6] selftests: tc-testing: move back to per test ns setup

[Simon Horman]

On Fri, Nov 17, 2023 at 02:12:04PM -0300, Pedro Tammela wrote:
> Surprisingly in kernel configs with most of the debug knobs turned on,
> pre-allocating the test resources makes tdc run much slower overall than
> when allocating resources on a per test basis.
> 
> As these knobs are used in kselftests in downstream CIs, let's go back
> to the old way of doing things to avoid kselftests timeouts.
> 
> Reported-by: kernel test robot <oliver.sang@intel.com>
> Closes: https://lore.kernel.org/oe-lkp/202311161129.3b45ed53-oliver.sang@intel.com
> Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>

Reviewed-by: Simon Horman <horms@kernel.org>

Re: [PATCH net-next 4/6] selftests: tc-testing: leverage -all in suite ns teardown

[Simon Horman]

On Fri, Nov 17, 2023 at 02:12:06PM -0300, Pedro Tammela wrote:
> Instead of listing lingering ns pinned files and delete them one by one, leverage '-all'
> from iproute2 to do it in a single process fork.
> 
> Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>

Reviewed-by: Simon Horman <horms@kernel.org>

Re: [PATCH net-next 6/6] selftests: tc-testing: report number of workers in use

[Simon Horman]

On Fri, Nov 17, 2023 at 02:12:08PM -0300, Pedro Tammela wrote:
> Report the number of workers in use to process the test batches.
> Since the number is now subject to a limit, avoid users getting
> confused.
> 
> Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>

Reviewed-by: Simon Horman <horms@kernel.org>

Re: [PATCH net-next 0/6] selftests: tc-testing: more updates to tdc

[Jakub Kicinski]

On Fri, 17 Nov 2023 14:12:02 -0300 Pedro Tammela wrote:
> Address the issues making tdc timeout on downstream CIs like lkp and
> tuxsuite.

Please do CC linux-kselftest@vger.kernel.org in the future.
Perhaps someone wants to read all selftests coming into the kernel.

Re: [PATCH net-next 0/6] selftests: tc-testing: more updates to tdc

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Fri, 17 Nov 2023 14:12:02 -0300 you wrote:
> Address the issues making tdc timeout on downstream CIs like lkp and
> tuxsuite.
> 
> Pedro Tammela (6):
>   selftests: tc-testing: cap parallel tdc to 4 cores
>   selftests: tc-testing: move back to per test ns setup
>   selftests: tc-testing: use netns delete from pyroute2
>   selftests: tc-testing: leverage -all in suite ns teardown
>   selftests: tc-testing: timeout on unbounded loops
>   selftests: tc-testing: report number of workers in use
> 
> [...]

Here is the summary with links:
  - [net-next,1/6] selftests: tc-testing: cap parallel tdc to 4 cores
    https://git.kernel.org/netdev/net-next/c/025de7b6a6dd
  - [net-next,2/6] selftests: tc-testing: move back to per test ns setup
    https://git.kernel.org/netdev/net-next/c/50a5988a7a54
  - [net-next,3/6] selftests: tc-testing: use netns delete from pyroute2
    https://git.kernel.org/netdev/net-next/c/3d5026fc5adb
  - [net-next,4/6] selftests: tc-testing: leverage -all in suite ns teardown
    https://git.kernel.org/netdev/net-next/c/3f2d94a4ff48
  - [net-next,5/6] selftests: tc-testing: timeout on unbounded loops
    https://git.kernel.org/netdev/net-next/c/4b480cfb1066
  - [net-next,6/6] selftests: tc-testing: report number of workers in use
    https://git.kernel.org/netdev/net-next/c/4968afa0143d

You are awesome, thank you!
-- 
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