linux-kernel - Re: [PATCH 08/11] selftests: net/fcnal: Replace sleep after server start with -k

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Date:   Wed, 6 Oct 2021 19:22:45 -0600
From:   David Ahern <dsahern@...il.com>
To:     Leonard Crestez <cdleonard@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Shuah Khan <shuah@...nel.org>, David Ahern <dsahern@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Ido Schimmel <idosch@...dia.com>,
        Seth David Schoen <schoen@...alty.org>,
        netdev@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/11] selftests: net/fcnal: Replace sleep after server
 start with -k

On 10/6/21 3:35 PM, Leonard Crestez wrote:
> 
> I counted the [FAIL] or [ OK ] markers but not the output of nettest
> itself. I don't know what to look for, I guess I could diff the outputs?
> 
> Shouldn't it be sufficient to compare the exit codes of the nettest client?

mistakes happen. The 700+ tests that exist were verified by me when I
submitted the script - that each test passes when it should and fails
when it should. "FAIL" has many reasons. I tried to have separate exit
codes for nettest.c to capture the timeouts vs ECONNREFUSED, etc., but I
could easily have made a mistake. scanning the output is the best way.
Most of the 'supposed to fail' tests have a HINT saying why it should fail.

> 
> The output is also modified by a previous change to not capture server
> output separately and instead let it be combined with that of the
> client. That change is required for this one, doing out=$(nettest -k)
> does not return on fork unless the pipe is also closed.
> 
> I did not look at your change, mine is relatively minimal because it
> only changes who decide when the server goes into the background: the
> shell script or the server itself. This makes it work very easily even
> for tests with multiple server instances.

The logging issue is why I went with 1 binary do both server and client
after nettest.c got support for changing namespaces.