linux-kernel - Re: [PATCH bpf-next v6] bpf: Change value of MAX_TAIL_CALL

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Date:   Tue, 16 Nov 2021 13:40:09 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Tiezhu Yang <yangtiezhu@...ngson.cn>
Cc:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org, lixuefeng@...ngson.cn,
        johan.almbladh@...finetworks.com, kafai@...com,
        songliubraving@...com, yhs@...com, john.fastabend@...il.com,
        kpsingh@...nel.org, illusionist.neo@...il.com, zlim.lnx@...il.com,
        naveen.n.rao@...ux.ibm.com, luke.r.nels@...il.com,
        xi.wang@...il.com, bjorn@...nel.org, iii@...ux.ibm.com,
        hca@...ux.ibm.com, gor@...ux.ibm.com, udknight@...il.com,
        davem@...emloft.net
Subject: Re: [PATCH bpf-next v6] bpf: Change value of MAX_TAIL_CALL_CNT from 32 to
 33

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Daniel Borkmann <daniel@...earbox.net>:

On Fri,  5 Nov 2021 09:30:00 +0800 you wrote:
> In the current code, the actual max tail call count is 33 which is greater
> than MAX_TAIL_CALL_CNT (defined as 32), the actual limit is not consistent
> with the meaning of MAX_TAIL_CALL_CNT, there is some confusion and need to
> spend some time to think about the reason at the first glance.
> 
> We can see the historical evolution from commit 04fd61ab36ec ("bpf: allow
> bpf programs to tail-call other bpf programs") and commit f9dabe016b63
> ("bpf: Undo off-by-one in interpreter tail call count limit").
> 
> [...]

Here is the summary with links:
  - [bpf-next,v6] bpf: Change value of MAX_TAIL_CALL_CNT from 32 to 33
    https://git.kernel.org/bpf/bpf-next/c/ebf7f6f0a6cd

You are awesome, thank you!
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