netdev - Re: [PATCH v4 net] bpf: add bpf_sk_netns

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Message-ID: <cc15d1fa-dd38-c01b-7a42-9eaf206d98a2@cumulusnetworks.com>
Date:   Wed, 15 Feb 2017 19:16:03 -0700
From:   David Ahern <dsa@...ulusnetworks.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        Alexei Starovoitov <ast@...com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Daniel Borkmann <daniel@...earbox.net>,
        Tejun Heo <tj@...nel.org>,
        Andy Lutomirski <luto@...capital.net>, netdev@...r.kernel.org
Subject: Re: [PATCH v4 net] bpf: add bpf_sk_netns_id() helper

On 2/14/17 12:21 AM, Eric W. Biederman wrote:
>> in cases where bpf programs are looking at sockets and packets
>> that belong to different netns, it could be useful to get an id
>> that uniquely identify a netns within the whole system.
> It could be useful but there is no unique namespace id.
> 

Have you given thought to a unique namespace id? Networking tracepoints
for example could really benefit from a unique id.