From: Petr Machata <petrm@mellanox.com>
To: Jakub Kicinski <kuba@kernel.org>
Cc: Ido Schimmel <idosch@idosch.org>,
netdev@vger.kernel.org, davem@davemloft.net, jiri@mellanox.com,
jhs@mojatatu.com, xiyou.wangcong@gmail.com, mlxsw@mellanox.com,
Ido Schimmel <idosch@mellanox.com>
Subject: Re: [PATCH net-next 2/6] net: sched: Add centralized RED flag checking
Date: Tue, 10 Mar 2020 23:23:23 +0100 [thread overview]
Message-ID: <87mu8nyhlw.fsf@mellanox.com> (raw)
In-Reply-To: <20200310125321.699b36bc@kicinski-fedora-PC1C0HJN>
Jakub Kicinski <kuba@kernel.org> writes:
> On Tue, 10 Mar 2020 10:48:24 +0100 Petr Machata wrote:
>> > The only flags which are validated today are the gRED per-vq ones, which
>> > are a recent addition and were validated from day one.
>>
>> Do you consider the validation as such to be a problem? Because that
>> would mean that the qdiscs that have not validated flags this way
>> basically cannot be extended ever ("a buggy userspace used to get a
>> quiet slicing of flags, and now they mean something").
>
> I just remember leaving it as is when I was working on GRED, because
> of the potential breakage. The uAPI policy is what it is, then again
> we probably lose more by making the code of these ancient Qdiscs ugly
> than we win :(
>
> I don't feel like I can ack it with clear conscience tho.
Just to make sure -- are you opposed to adding a new flag, or to
validation? At least the adaptative flag was added years after the
others in 2011. I wasn't paying much attention to kernel back then, but
I think the ABI rules are older than that.
next prev parent reply other threads:[~2020-03-10 22:23 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-09 18:34 [PATCH net-next 0/6] RED: Introduce an ECN tail-dropping mode Ido Schimmel
2020-03-09 18:34 ` [PATCH net-next 1/6] selftests: qdiscs: Add TDC test for RED Ido Schimmel
2020-03-10 15:40 ` Roman Mashak
2020-03-10 16:56 ` Petr Machata
2020-03-10 17:28 ` Roman Mashak
2020-03-09 18:34 ` [PATCH net-next 2/6] net: sched: Add centralized RED flag checking Ido Schimmel
2020-03-09 22:18 ` Jakub Kicinski
2020-03-10 9:48 ` Petr Machata
2020-03-10 19:53 ` Jakub Kicinski
2020-03-10 22:23 ` Petr Machata [this message]
2020-03-10 23:00 ` Jakub Kicinski
2020-03-10 23:53 ` Petr Machata
2020-03-09 18:35 ` [PATCH net-next 3/6] net: sched: RED: Introduce an ECN tail-dropping mode Ido Schimmel
2020-03-09 22:12 ` Jakub Kicinski
2020-03-10 9:48 ` Petr Machata
2020-03-09 18:35 ` [PATCH net-next 4/6] mlxsw: spectrum_qdisc: Offload RED " Ido Schimmel
2020-03-09 18:35 ` [PATCH net-next 5/6] selftests: qdiscs: RED: Add taildrop tests Ido Schimmel
2020-03-09 18:35 ` [PATCH net-next 6/6] selftests: mlxsw: RED: Test RED ECN taildrop offload Ido Schimmel
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