netdev - Re: [net-next 1/1] samples: bpf: Refactor test_cgrp2

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Date:   Mon, 28 Nov 2016 21:42:25 -0800
From:   Sargun Dhillon <sargun@...gun.me>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     netdev <netdev@...r.kernel.org>, Daniel Mack <daniel@...que.org>,
        Alexei Starovoitov <ast@...com>
Subject: Re: [net-next 1/1] samples: bpf: Refactor test_cgrp2_attach -- use
 getopt, and add mode

On Mon, Nov 28, 2016 at 7:50 PM, Alexei Starovoitov
<alexei.starovoitov@...il.com> wrote:
> On Mon, Nov 28, 2016 at 02:52:42PM -0800, Sargun Dhillon wrote:
>> This patch modifies test_cgrp2_attach to use getopt so we can use standard
>> command line parsing.
>>
>> It also adds an option to run the program in detach only mode. This does
>> not attach a new filter at the cgroup, but only runs the detach command.
>>
>> Lastly, it changes the attach code to not detach and then attach. It relies
>> on the 'hotswap' behaviour of CGroup BPF programs to be able to change
>> in-place. If detach-then-attach behaviour needs to be tested, the example
>> can be run in detach only mode prior to attachment.
>>
>> Signed-off-by: Sargun Dhillon <sargun@...gun.me>
>
> looks fine to me.
> I'd really prefer this example to become an automated test eventually.
I can do that. As far as test cases:

1. create /foo
2. enter foo
3. attach drop filter to foo
4. try to ping 127.0.0.1 (make sure it returns 0 replies)
5. create /foo/bar
6. enter /foo/bar
7. try to ping 127.0.0.1 (make sure it returns 0 replies)
8. attach passthrough filter to foo/bar
9. try to ping 127.0.0.1 (make sure it returns 1 replies)
10. Detach filter from foo/bar
11. try to ping 127.0.0.1 (make sure it returns 0 replies)
Reasonable?


>
> Acked-by: Alexei Starovoitov <ast@...nel.org>
>