netdev - Re: [RFC PATCH 00/12] Implement XDP bpf

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Date:   Thu, 13 Jul 2017 11:21:04 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     john.fastabend@...il.com
Cc:     brouer@...hat.com, netdev@...r.kernel.org, andy@...yhouse.net,
        daniel@...earbox.net, ast@...com, alexander.duyck@...il.com,
        bjorn.topel@...el.com, jakub.kicinski@...ronome.com,
        ecree@...arflare.com, sgoutham@...ium.com, Yuval.Mintz@...ium.com,
        saeedm@...lanox.com
Subject: Re: [RFC PATCH 00/12] Implement XDP bpf_redirect vairants

From: John Fastabend <john.fastabend@...il.com>
Date: Thu, 13 Jul 2017 10:00:15 -0700

> On 07/13/2017 09:16 AM, Jesper Dangaard Brouer wrote:
>> On Thu, 13 Jul 2017 13:14:30 +0200
>> Jesper Dangaard Brouer <brouer@...hat.com> wrote:
>> 
>>> I'm still getting crashes (but much harder to provoke), but I figured
>>> out why.  We sort of missed one case, where map_to_flush gets set, when
>>> the ndo_xdp_xmit() call starts to fail, and the ixgbe driver then
>>> forgets to call xdp_do_flush_map, if all packets in that NAPI cycle
>>> failed.  We could blame the driver, but yhe clean solution is making
>>> sure, that we don't set map_to_flush when the __bpf_tx_xdp() call
>>> fails. It should also handle the other case I fixed .... I'll cleanup
>>> my PoC-fix patch, test it and provide it here.
>> 
>> I changed flow in the function to be:
> 
> 
> Great, I'll merge this, the other couple fixes, and the bitops optimization and
> hopefully then we are set. I'll post a v2 and we can do some final checks.

I am so looking forward to merging this, great work everyone.