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Date:   Mon, 10 Aug 2020 11:43:10 -0700
From:   Andrii Nakryiko <>
To:     Toke Høiland-Jørgensen <>
Cc:     Andrii Nakryiko <>, bpf <>,
        Networking <>,
        Alexei Starovoitov <>,
        Daniel Borkmann <>,
        Kernel Team <>
Subject: Re: [PATCH bpf-next 0/5] BPF link force-detach support

On Mon, Aug 10, 2020 at 8:01 AM Toke Høiland-Jørgensen <> wrote:
> Andrii Nakryiko <> writes:
> > This patch set adds new BPF link operation, LINK_DETACH, allowing processes
> > with BPF link FD to force-detach it from respective BPF hook, similarly how
> > BPF link is auto-detached when such BPF hook (e.g., cgroup, net_device, netns,
> > etc) is removed. This facility allows admin to forcefully undo BPF link
> > attachment, while process that created BPF link in the first place is left
> > intact.
> >
> > Once force-detached, BPF link stays valid in the kernel as long as there is at
> > least one FD open against it. It goes into defunct state, just like
> > auto-detached BPF link.
> >
> > bpftool also got `link detach` command to allow triggering this in
> > non-programmatic fashion.
> I know this was already merged, but just wanted to add a belated 'thanks
> for adding this'!

You are welcome!

> > Cc: Toke Høiland-Jørgensen <>
> BTW, I've noticed that you tend to drop Ccs on later versions of your
> patch series (had to go and lookup v2 of this to check that it was in
> fact merged). Is that intentional? :)

Hm.. not sure about whether I tend to do that. But in this it was
intentional and I dropped you from CC because I've seen enough
reminders about your vacation, didn't need more ;)

In general, though, I try to keep CC list short, otherwise vger blocks
my patches. People directly CC'd get them, but they never appear on
bpf@...r mailing list. So it probably happened a few times where I
started off with longer CC and had to drop people from it just to get
my patches into patchworks.

> -Toke

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