linux-kernel - Re: [PATCH] MIPS: Add missing file for eBPF JIT.

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Date:   Fri, 04 Aug 2017 11:24:15 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     daniel@...earbox.net
Cc:     david.daney@...ium.com, ast@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
        ralf@...ux-mips.org, James.Cowgill@...tec.com,
        markos.chandras@...tec.com
Subject: Re: [PATCH] MIPS: Add missing file for eBPF JIT.

From: Daniel Borkmann <daniel@...earbox.net>
Date: Fri, 04 Aug 2017 15:05:19 +0200

> On 08/04/2017 02:10 AM, David Daney wrote:
>> Inexplicably, commit f381bf6d82f0 ("MIPS: Add support for eBPF JIT.")
>> lost a file somewhere on its path to Linus' tree.  Add back the
>> missing ebpf_jit.c so that we can build with CONFIG_BPF_JIT selected.
>>
>> This version of ebpf_jit.c is identical to the original except for two
>> minor change need to resolve conflicts with changes merged from the
>> BPF branch:
>>
>> A) Set prog->jited_len = image_size;
>> B) Use BPF_TAIL_CALL instead of BPF_CALL | BPF_X
>>
>> Fixes: f381bf6d82f0 ("MIPS: Add support for eBPF JIT.")
>> Signed-off-by: David Daney <david.daney@...ium.com>
>> ---
>>
>> It might be best to merge this along the path of BPF fixes rather than
>> MIPS, as the MIPS maintainer (Ralf) seems to be inactive recently.
> 
> Looks like situation is that multiple people including myself tried
> to contact Ralf due to 'half/mis-applied' MIPS BPF JIT in [1,2] that
> sits currently in Linus tree, but never got a reply back since mid
> June.
> 
> Given the work was accepted long ago but incorrectly merged, would be
> great if this could still be fixed up with this patch. Given Ralf
> seems
> unfortunately unresponsive, is there a chance, if people are fine with
> it, that we could try route this fix e.g. via -net instead before a
> final v4.13?
> 
> Anyway, the generic pieces interacting with core BPF look good to me:
> 
> Acked-by: Daniel Borkmann <daniel@...earbox.net>

Ok, I've applied this to the net GIT tree.

Thanks.