netdev - Re: [PATCH v2 2/2] i40e: add support for XDP

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Message-ID: <CAKgT0UcoMxQSCWzi1GKorRXNADX0yjrQBpv04cKvR5=g3+BjsQ@mail.gmail.com>
Date:   Thu, 22 Mar 2018 07:52:31 -0700
From:   Alexander Duyck <alexander.duyck@...il.com>
To:     Björn Töpel <bjorn.topel@...il.com>
Cc:     Jesper Dangaard Brouer <brouer@...hat.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        intel-wired-lan <intel-wired-lan@...ts.osuosl.org>,
        Björn Töpel <bjorn.topel@...el.com>,
        "Karlsson, Magnus" <magnus.karlsson@...el.com>,
        Netdev <netdev@...r.kernel.org>,
        "Duyck, Alexander H" <alexander.h.duyck@...el.com>
Subject: Re: [PATCH v2 2/2] i40e: add support for XDP_REDIRECT

On Thu, Mar 22, 2018 at 5:20 AM, Björn Töpel <bjorn.topel@...il.com> wrote:
> 2018-03-22 12:58 GMT+01:00 Jesper Dangaard Brouer <brouer@...hat.com>:
>>
>> On Thu, 22 Mar 2018 10:03:07 +0100 Björn Töpel <bjorn.topel@...il.com> wrote:
>>
>>> +/**
>>> + * i40e_xdp_xmit - Implements ndo_xdp_xmit
>>> + * @dev: netdev
>>> + * @xdp: XDP buffer
>>> + *
>>> + * Returns Zero if sent, else an error code
>>> + **/
>>> +int i40e_xdp_xmit(struct net_device *dev, struct xdp_buff *xdp)
>>> +{
>>
>> The return code is used by the XDP redirect tracepoint... this is the
>> only way we have to debug/troubleshoot runtime issues with XDP. Thus,
>> these need to be consistent across drives and distinguishable.
>>
>
> Thanks for pointing this out! I'll address all your comments and do a
> respin (but I'll wait for Alex' comments, if any).
>
>
> Björn
>

The patch mostly looks okay to me. Maybe a bit of reverse xmas tree
formatting needs to be addressed for the variable declarations in your
two new functions but that is about it in terms of what I see.

- Alex