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SubjectRe: [PATCH 00/14] Modify action API for implementing lockless actions

On Mon 14 May 2018 at 18:03, Jamal Hadi Salim <> wrote:
> On 14/05/18 10:27 AM, Vlad Buslov wrote:
>> Currently, all netlink protocol handlers for updating rules, actions and
>> qdiscs are protected with single global rtnl lock which removes any
>> possibility for parallelism. This patch set is a first step to remove
>> rtnl lock dependency from TC rules update path. It updates act API to
>> use atomic operations, rcu and spinlocks for fine-grained locking. It
>> also extend API with functions that are needed to update existing
>> actions for parallel execution.
>> Outline of changes:
>> - Change tc action to use atomic reference and bind counters, rcu
>> mechanism for cookie update.
>> - Extend action ops API with 'delete' function and 'unlocked' flag.
>> - Change action API to work with actions in lockless manner based on
>> primitives implemented in previous patches.
>> - Extend action API with new functions necessary to implement unlocked
>> actions.
> Please run all the tdc tests with these changes. This area has almost
> good test coverage at this point. If you need help just ping me.
> cheers,
> jamal

Hello Jamal,

I'm trying to run tdc, but keep getting following error even on clean
branch without my patches:

Test d190: Add police action with maximum index

-----> teardown stage *** Could not execute: "$TC actions flush action mirred"

-----> teardown stage *** Error message: "RTNETLINK answers: Invalid argument
We have an error flushing

-----> teardown stage *** Aborting test run.

<_io.BufferedReader name=3> *** stdout ***

<_io.BufferedReader name=5> *** stderr ***
"-----> teardown stage" did not complete successfully
Exception <class '__main__.PluginMgrTestFail'> ('teardown', 'RTNETLINK answers: Invalid argument\nWe have an error talking to the kernel\nCommand "action" is unknown, try "tc actions help".\n', '"-----> teardown stage" did not complete suc
cessfully') (caught in test_runner, running test 54 d190 Add police action with maximum index stage teardown)
File "./", line 293, in test_runner
tap += run_one_test(pm, args, index, tidx)
File "./", line 229, in run_one_test
prepare_env(args, pm, 'teardown', '-----> teardown stage', tidx['teardown'], procout)
File "./", line 177, in prepare_env
'"{}" did not complete successfully'.format(prefix))
accumulated output for this test:
RTNETLINK answers: Invalid argument
We have an error talking to the kernel
Command "action" is unknown, try "tc actions help".


I've updated both iproute2 and kernel to latest master and net-next
respectively, but error persists. Am I missing something? Maybe I should
you some specific "blessed" version of TC?


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