netdev - Re: [net-next,v4] openvswitch: Add packet len info to upcall.

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Date:	Mon, 20 Jun 2016 12:44:54 -0700
From:	pravin shelar <pshelar@....org>
To:	William Tu <u9012063@...il.com>
Cc:	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	Pravin Shelar <pshelar@...ira.com>
Subject: Re: [net-next,v4] openvswitch: Add packet len info to upcall.

On Mon, Jun 20, 2016 at 7:26 AM, William Tu <u9012063@...il.com> wrote:
> The commit f2a4d086ed4c ("openvswitch: Add packet truncation support.")
> introduces packet truncation before sending to userspace upcall receiver.
> This patch passes up the skb->len before truncation so that the upcall
> receiver knows the original packet size. Potentially this will be used
> by sFlow, where OVS translates sFlow config header=N to a sample action,
> truncating packet to N byte in kernel datapath. Thus, only N bytes instead
> of full-packet size is copied from kernel to userspace, saving the
> kernel-to-userspace bandwidth.
>
> Signed-off-by: William Tu <u9012063@...il.com>
> Cc: Pravin Shelar <pshelar@...ira.com>
> ---
> v3->v4:
> - Add OVS_PACKET_ATTR_LEN only when packet is truncated,
>   This avoid sending extra attribute in the case of miss flow.
> v2->v3:
> - Remove platform specific name.
> - Fix issue when receiving GSO packet
> - Remove skblen in struct dp_upcall_info
> v1->v2:
> - Pass skb->len to userspace instead of cutlen
> ---
Acked-by: Pravin B Shelar <pshelar@....org>

Thanks.