netdev - Re: [PATCH v8 bpf-next 0/7] bpf: tailcalls in BPF subprograms

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Date:   Wed, 23 Sep 2020 17:11:46 +0100
From:   Lorenz Bauer <lmb@...udflare.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        John Fastabend <john.fastabend@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        bpf <bpf@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Björn Töpel <bjorn.topel@...el.com>,
        "Karlsson, Magnus" <magnus.karlsson@...el.com>,
        Andrii Nakryiko <andriin@...com>,
        Martin KaFai Lau <kafai@...com>
Subject: Re: [PATCH v8 bpf-next 0/7] bpf: tailcalls in BPF subprograms

On Fri, 18 Sep 2020 at 04:26, Alexei Starovoitov
<alexei.starovoitov@...il.com> wrote:
[...]
>
> Lorenz,
> if you can test it on cloudflare progs would be awesome.

Our programs all bpf_tail_call from the topmost function, so no calls
from subprogs. I stripped out our FORCE_INLINE flag, recompiled and
ran our testsuite. cls_redirect.c (also in the kernel selftests) has a
test failure that I currently can't explain, but I don't have the time
to look at it in detail right now.

Hopefully I can get back to this next week.

Best
Lorenz

--
Lorenz Bauer  |  Systems Engineer
6th Floor, County Hall/The Riverside Building, SE1 7PB, UK

www.cloudflare.com