netdev - Re: [PATCH net-next 00/10] bnxt

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Date:   Mon, 30 Jan 2017 23:38:33 -0800
From:   Michael Chan <michael.chan@...adcom.com>
To:     Jakub Kicinski <kubakici@...pl>
Cc:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        David Miller <davem@...emloft.net>,
        Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 00/10] bnxt_en: Add XDP support.

On Mon, Jan 30, 2017 at 9:13 PM, Jakub Kicinski <kubakici@...pl> wrote:
> On Mon, 30 Jan 2017 20:47:47 -0800, Alexei Starovoitov wrote:
>> On Mon, Jan 30, 2017 at 08:49:25PM -0500, Michael Chan wrote:
>> > The first 8 patches refactor the code (rx/tx code paths and ring logic)
>> > and add the basic infrastructure to support XDP.  The 9th patch adds
>> > basic ndo_xdp to support XDP_DROP and XDP_PASS only.  The 10th patch
>> > completes the series with XDP_TX.
>>
>> Looks great.
>> Could you please share performance numbers ?
>>
>> Also please add something like:
>>   if (prog && prog->xdp_adjust_head) {
>>           netdev_warn(dev, "Does not support bpf_xdp_adjust_head()\n");
>>           return -EOPNOTSUPP;
>>   }
>> unless you plan to add adjut_head support until net-next closes.
>> Note, it's must have for load balancer functionality.
>
> I was about to ask whether it's OK at this point to add XDP support
> without xdp_adjust_head()?  My understanding was that this is basic
> functionality and therefore required?

I need to first figure out what xdp_adjust_head means.  If it is ok,
I'd like to defer it.

>
> FWIW the check you requested is there in patch 9.

Yes, it is in there.  I just copied the same code from other drivers.