netdev - Re: [PATCH net] cxgb4/cxgb4vf: Fixes regression in perf when tx vlan offload is disabled

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Date:	Sat, 30 Jul 2016 20:40:11 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	hariprasad@...lsio.com
Cc:	netdev@...r.kernel.org, leedom@...lsio.com, nirranjan@...lsio.com
Subject: Re: [PATCH net] cxgb4/cxgb4vf: Fixes regression in perf when tx
 vlan offload is disabled

From: Hariprasad Shenai <hariprasad@...lsio.com>
Date: Thu, 28 Jul 2016 13:28:57 +0530

> The commit 637d3e997351 ("cxgb4: Discard the packet if the length is
> greater than mtu") introduced a regression in the VLAN interface
> performance when Tx VLAN offload is disabled.
> 
> Check if skb is tagged, regardless of whether it is hardware accelerated
> or not. Presently we were checking only for hardware acclereated one,
> which caused performance to drop to ~0.17Mbps on a 10GbE adapter for
> VLAN interface, when tx vlan offload is turned off using ethtool.
> The ethernet head length calculation was going wrong in this case, and
> driver ended up dropping packets.
> 
> Fixes: 637d3e997351 ("cxgb4: Discard the packet if the length is greater than mtu")
> 
> Signed-off-by: Hariprasad Shenai <hariprasad@...lsio.com>

Applied.