Re: [PATCH bpf-next 2/5] bpf: allow for tailcalls in BPF subprograms

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Subject: Re: [PATCH bpf-next 2/5] bpf: allow for tailcalls in BPF subprograms
From: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Date: Thu, 16 Jul 2020 23:10:09 +0200
Cc: bpf@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, bjorn.topel@xxxxxxxxx, magnus.karlsson@xxxxxxxxx
In-reply-to: <20200715233634.3868-3-maciej.fijalkowski@intel.com>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2

On 7/16/20 1:36 AM, Maciej Fijalkowski 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@xxxxxxxxx>


[nit: this patch also needs reordering]

References:
- [PATCH bpf-next 0/5] bpf: tailcalls in BPF subprograms
  - From: Maciej Fijalkowski
- [PATCH bpf-next 2/5] bpf: allow for tailcalls in BPF subprograms
  - From: Maciej Fijalkowski

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