netdev - Re: [PATCH bpf-next 1/6] bpf: add classid helper only based on skb->sk

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Date:   Fri, 25 Sep 2020 17:35:55 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     ast@...nel.org, john.fastabend@...il.com, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH bpf-next 1/6] bpf: add classid helper only based on
 skb->sk

On 9/25/20 4:46 PM, Jakub Kicinski wrote:
> On Thu, 24 Sep 2020 20:21:22 +0200 Daniel Borkmann wrote:
>> Similarly to 5a52ae4e32a6 ("bpf: Allow to retrieve cgroup v1 classid
>> from v2 hooks"), add a helper to retrieve cgroup v1 classid solely
>> based on the skb->sk, so it can be used as key as part of BPF map
>> lookups out of tc from host ns, in particular given the skb->sk is
>> retained these days when crossing net ns thanks to 9c4c325252c5
>> ("skbuff: preserve sock reference when scrubbing the skb."). This
>> is similar to bpf_skb_cgroup_id() which implements the same for v2.
>> Kubernetes ecosystem is still operating on v1 however, hence net_cls
>> needs to be used there until this can be dropped in with the v2
>> helper of bpf_skb_cgroup_id().
>>
>> Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
> 
> FWIW lot's of whitespace warnings from checkpatch --strict about
> comments having spaces before tabs here.

Expected given the way the UAPI helper comment is formatted / done in
order to then render the man page. So it's formatted the same way as
the other helper descriptions.

Thanks,
Daniel