linux-kernel - Re: [PATCH bpf-next 0/7] Support defragmenting IPv(4|6) packets in BPF

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Message-ID: <nk6jl4hqougwim4sfgnm6rleh64dqad6qbqghbmjcfi6o7qrae@q3jtw34azrml>
Date:   Thu, 29 Jun 2023 11:59:04 -0600
From:   Daniel Xu <dxu@...uu.xyz>
To:     Florian Westphal <fw@...len.de>
Cc:     Toke Høiland-Jørgensen <toke@...hat.com>,
        bpf@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        coreteam@...filter.org, netfilter-devel@...r.kernel.org,
        daniel@...earbox.net, dsahern@...nel.org
Subject: Re: [PATCH bpf-next 0/7] Support defragmenting IPv(4|6) packets in
 BPF

On Thu, Jun 29, 2023 at 04:53:15PM +0200, Florian Westphal wrote:
> Toke Høiland-Jørgensen <toke@...hat.com> wrote:
> > Florian Westphal <fw@...len.de> writes:
> > As for the original question, that's answered by your point above: If
> > those two modules are the only ones that are likely to need this, then a
> > flag for each is fine by me - that was the key piece I was missing (I'm
> > not a netfilter expert, as you well know).
> 
> No problem, I was worried I was missing an important piece of kfunc
> plumbing :-)
> 
> You do raise a good point though.  With kfuncs, module is pinned.
> So, should a "please turn on defrag for this bpf_link" pin
> the defrag modules too?
> 
> For plain netfilter we don't do that, i.e. you can just do
> "rmmod nf_defrag_ipv4".  But I suspect that for the new bpf-link
> defrag we probably should grab a reference to prevent unwanted
> functionality breakage of the bpf prog.

Ack. Will add to v3.

Thanks,
Daniel