netdev - Re: [PATCH net-next 12/18] IB/mlx5: Add kernel offload flow-tag

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Date:	Tue, 21 Jun 2016 08:18:49 -0700
From:	Eric Dumazet <edumazet@...gle.com>
To:	Saeed Mahameed <saeedm@....mellanox.co.il>
Cc:	Alexei Starovoitov <alexei.starovoitov@...il.com>,
	Saeed Mahameed <saeedm@...lanox.com>,
	"David S. Miller" <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Doug Ledford <dledford@...hat.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Maor Gottlieb <maorg@...lanox.com>,
	Huy Nguyen <huyn@...lanox.com>, Tal Alon <talal@...lanox.com>,
	Daniel Borkmann <daniel@...earbox.net>
Subject: Re: [PATCH net-next 12/18] IB/mlx5: Add kernel offload flow-tag

On Tue, Jun 21, 2016 at 6:04 AM, Saeed Mahameed
<saeedm@....mellanox.co.il> wrote:

>
> Alexei , I don't understand your concern.
> We already have a full/complete working dpdk bypass solution in
> userspace nothing extra is required from the kernel.
>
> We just want to see this traffic and any other rdma traffic in tcpdump
> or other standard sniffing tools.
>
> Anyway we brainstormed this internally today and we don't like the
> "skb->protocol = 0xffff" solution,

One solution would be to setup a special netdev used only for sniffers
(No IP address on it)

-> Only changes would happen in the driver, to set skb->dev to this
'debug' device.