linux-kernel - Re: [PATCH net-next V2] tuntap: hardware vlan tx support

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Message-Id: <20130727.200940.1407377271115722165.davem@davemloft.net>
Date:	Sat, 27 Jul 2013 20:09:40 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jasowang@...hat.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	basil.gor@...il.com, mst@...hat.com
Subject: Re: [PATCH net-next V2] tuntap: hardware vlan tx support

From: Jason Wang <jasowang@...hat.com>
Date: Thu, 25 Jul 2013 13:00:33 +0800

> Inspired by commit f09e2249c4f5c7c13261ec73f5a7807076af0c8e (macvtap: restore
> vlan header on user read). This patch adds hardware vlan tx support for
> tuntap. This is done by copying vlan header directly into userspace in
> tun_put_user() instead of doing it through __vlan_put_tag() in
> dev_hard_start_xmit(). This eliminates one unnecessary memmove() in
> vlan_insert_tag() for 802.1ad and 802.1q traffic.
> 
> pktgen test shows about 20% improvement for 802.1q traffic:
> 
> Before:
>   662149pps 317Mb/sec (317831520bps) errors: 0
> After:
>   801033pps 384Mb/sec (384495840bps) errors: 0
> 
> Cc: Basil Gor <basil.gor@...il.com>
> Cc: Michael S. Tsirkin <mst@...hat.com>
> Signed-off-by: Jason Wang <jasowang@...hat.com>

Applied, thanks Jason.
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