linux-kernel - Re: [PATCH net-next 3/4] bpf: add support for persistent maps/progs

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Date:	Fri, 23 Oct 2015 15:47:56 +0200
From:	Daniel Borkmann <daniel@...earbox.net>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Alexei Starovoitov <ast@...mgrid.com>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	davem@...emloft.net, viro@...IV.linux.org.uk, tgraf@...g.ch,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Alexei Starovoitov <ast@...nel.org>
Subject: Re: [PATCH net-next 3/4] bpf: add support for persistent maps/progs

On 10/22/2015 09:35 PM, Eric W. Biederman wrote:
> Daniel Borkmann <daniel@...earbox.net> writes:
>> On 10/20/2015 08:56 PM, Eric W. Biederman wrote:
>> ...
>>> Just FYI:  Using a device for this kind of interface is pretty
>>> much a non-starter as that quickly gets you into situations where
>>> things do not work in containers.  If someone gets a version of device
>>> namespaces past GregKH it might be up for discussion to use character
>>> devices.
>>
>> Okay, you are referring to this discussion here:
>>
>>    http://thread.gmane.org/gmane.linux.kernel.containers/26760
>
> That is a piece of it.  It is an old old discussion (which generally has
> been handled poorly).  For the forseeable future device namespaces have
> a firm NACK by GregKH.  Which means that dynamic character device based
> interfaces do not work in containers.  Which means if you are not
> talking about physical hardware, character devices are a poor fit.

Yes, it breaks down with real namespace support. Reworking the set with
an improved version of the fs code is already in progress.

Thanks,
Daniel
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