netdev - Re: [PATCH bpf-next v2 1/7] bpf: Add generic attach/detach/query API for multi-progs

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Date: Fri, 9 Jun 2023 13:08:01 -0700
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc: Toke Høiland-Jørgensen <toke@...nel.org>, 
	Timo Beckers <timo@...line.eu>, Daniel Borkmann <daniel@...earbox.net>, 
	Stanislav Fomichev <sdf@...gle.com>, Alexei Starovoitov <ast@...nel.org>, Andrii Nakryiko <andrii@...nel.org>, 
	Martin KaFai Lau <martin.lau@...ux.dev>, Nikolay Aleksandrov <razor@...ckwall.org>, 
	John Fastabend <john.fastabend@...il.com>, Jakub Kicinski <kuba@...nel.org>, Daniel Xu <dxu@...uu.xyz>, 
	Joe Stringer <joe@...ium.io>, "David S. Miller" <davem@...emloft.net>, bpf <bpf@...r.kernel.org>, 
	Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH bpf-next v2 1/7] bpf: Add generic attach/detach/query API
 for multi-progs

On Fri, Jun 9, 2023 at 11:56 AM Andrii Nakryiko
<andrii.nakryiko@...il.com> wrote:
>
> Me, Daniel, Timo are arguing that there are real situations where you
> have to be first or need to die.

afaik out of all xdp and tc progs there is not a single prog in the fb fleet
that has to be first.
fb's ddos and firewall don't have to be first.
cilium and datadog progs don't have to be first either.
The race between cilium and datadog was not the race to the first position,
but the conflict due to the same prio.
In all cases, I'm aware, prog owners care a lot about ordering,
but never about strict first.