netdev - Re: [PATCH v8 bpf-next 6/7] bpf: allow for tailcalls in BPF subprograms for x64 JIT

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Message-ID: <CAADnVQLaOqsWq8oX__Q2K7akTpQ8uTV+5ge9Fqx2bq5yupfS6A@mail.gmail.com>
Date:   Thu, 17 Sep 2020 15:52:58 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Cc:     Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        Björn Töpel <bjorn.topel@...el.com>,
        Magnus Karlsson <magnus.karlsson@...el.com>
Subject: Re: [PATCH v8 bpf-next 6/7] bpf: allow for tailcalls in BPF
 subprograms for x64 JIT

On Thu, Sep 17, 2020 at 3:51 PM Maciej Fijalkowski
<maciej.fijalkowski@...el.com> wrote:
>
> On Thu, Sep 17, 2020 at 02:03:32PM -0700, Andrii Nakryiko wrote:
> > On Wed, Sep 16, 2020 at 3:54 PM Maciej Fijalkowski
> > <maciej.fijalkowski@...el.com> wrote:
> > >
> > > Relax verifier's restriction that was meant to forbid tailcall usage
> > > when subprog count was higher than 1.
> > >
> > > Also, do not max out the stack depth of program that utilizes tailcalls.
> > >
> > > Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
> > > ---
> >
> > Maciej,
> >
> > Only patches 6 and 7 arrived (a while ago) and seems like the other
> > patches are lost and not going to come. Do you mind resending entire
> > patch set?
>
> Sure. Vger lately has been giving me a hard time, thought that maybe rest
> of set would eventually arrive, similarly to what Toke experienced I
> guess.

I've got the patches. No need to resend.