Re: [PATCH net-next 2/4] selftests: tc-testing: check if 'jq' is available in taprio script

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On 24/01/2024 07:31, Davide Caratti wrote:
hello Pedro, thanks for your answer!

On Tue, Jan 23, 2024 at 5:47 PM Pedro Tammela <pctammela@xxxxxxxxxxxx> wrote:

On 23/01/2024 10:17, Davide Caratti wrote:
hi Pedro,

On Tue, Jan 23, 2024 at 1:28 PM Pedro Tammela <pctammela@xxxxxxxxxxxx> wrote:

If 'jq' is not available the taprio tests that use this script will
run forever. Check if it exists before entering the while loop.

[...]

nit: what about returning $KSFT_SKIP (that is 4) if jq is not there?
so the test does not fail.
thanks!

Since these scripts are run in the setup phase, it has a special treatment.

Take for example this run:
ok 1 ba39 - Add taprio Qdisc to multi-queue device (8 queues)
ok 2 9462 - Add taprio Qdisc with multiple sched-entry
ok 3 8d92 - Add taprio Qdisc with txtime-delay
ok 4 d092 - Delete taprio Qdisc with valid handle
ok 5 8471 - Show taprio class
ok 6 0a85 - Add taprio Qdisc to single-queue device
ok 7 3e1e - Add taprio Qdisc with an invalid cycle-time
ok 8 39b4 - Reject grafting taprio as child qdisc of software taprio #
skipped - "-----> prepare stage" did not complete successfully

ok 9 e8a1 - Reject grafting taprio as child qdisc of offloaded taprio #
skipped - skipped - previous setup failed 9 39b4

[...]

As of today it returns 0, success in ksft, even though it clearly
wasn't. Looking at the code any failures in the setup/teardown phase
will stop the run, skip all the remaining tests but still return success.

About returning skip from the script, aside from marking it as skip and
continuing the suite, we would need to run a silent teardown, one that
executes all commands in the specified teardown but
ignores errors. In this case we are assuming all setup steps follow KSFT
return codes. Not sure if it it's reasonable or not...

wouldn't this be fixed by adding this line:

"dependsOn" : "command -v jq >/dev/null"

to test scenarios 39b4 and e8a1 ? I'm asking this because jq is used
also in verifyCmd after the script, to parse results.
Background for this question: I see tdc skipping both setup and
teardown stages for each test case in taprio.json where this line:

      "dependsOn": "command -v ciao >/dev/null",

is present. Rather than doing a setup +  silent teardown, just do
nothing and go to the next test.

Oh indeed! Thanks for the suggestion this is much nicer.
I will send a v2!


As your suggestion is not a blocker, I would rather address the above
problems in a follow up series since they will require some refactoring.
WDYT?

no objections, but I'm curious to see if "dependsOn" would fix this case :)
thanks!





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