[PATCH] bpf: don't verify classic bpfs

[Stephen Hemminger]

On Sun, 12 May 2024 08:55:45 +0300
Yoav Winstein <yoav.w at claroty.com> wrote:

> When classic BPFs with lots of branching instructions are compiled,
> __rte_bpf_bpf_validate runs way too slow. A simple bpf such as:
> 'ether host a0:38:6d:af:17:eb or b3:a3:ff:b6:c1:ef or ...' 12 times
> 
> results in ~1 minute of bpf validation.
> This patch makes __rte_bpf_bpf_validate be aware of bpf_prm originating
> from classic BPF, allowing to safely skip over the validation.
> 
> Signed-off-by: Yoav Winstein <yoav.w at claroty.com>
> ---

No.
Wallpapering over a performance bug in the BPF library is not
the best way to handle this. Please analyze the problem in the BPF
library; it should be fixed there.