netdev - Re: [net-next 07/20] igb: add a character device to support AVB

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Message-ID: <CAJ3xEMiHz+5n1iHO9s2Vuz_ssgJWTNBU-1gCgf_Bf0Rrc-kA-A@mail.gmail.com>
Date:	Wed, 24 Feb 2016 22:06:25 +0200
From:	Or Gerlitz <gerlitz.or@...il.com>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	David Miller <davem@...emloft.net>
Cc:	Gangfeng Huang <gangfeng.huang@...com>,
	Linux Netdev List <netdev@...r.kernel.org>,
	"nhorman@...hat.com" <nhorman@...hat.com>,
	"sassmann@...hat.com" <sassmann@...hat.com>,
	"jogreene@...hat.com" <jogreene@...hat.com>
Subject: Re: [net-next 07/20] igb: add a character device to support AVB

On Wed, Feb 24, 2016 at 6:26 AM, Jeff Kirsher
<jeffrey.t.kirsher@...el.com> wrote:
> From: Gangfeng Huang <gangfeng.huang@...com>

> This patch create a character device for Intel I210 Ethernet controller,

wait, do we want L2 network driver to create char devices

> it can be used for developing Audio/Video Bridging applications,Industrial
> Ethernet applications which require precise timing control over frame
> transmission, or test harnesses for measuring system latencies and sampling
> events.

for various reasons such as the above?

> As the AVB queues (0,1) are mapped to a  user-space application, typical
> LAN traffic must be steered away from these queues. For transmit, this
> driver implements one method registering an ndo_select_queue handler to
> map traffic to queue[3] and set the register MRQC to receive all BE
> traffic to Rx queue[3].
>
> This patch is reference to the Intel Open-AVB project:
> http://github.com/AVnu/Open-AVB/tree/master/kmod/igb
>
> Signed-off-by: Gangfeng Huang <gangfeng.huang@...com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>