linux-kernel - Re: [PATCH net-next] xfrm: Add support for network devices capable of removing the ESP trailer

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Date:   Thu, 31 Aug 2017 13:56:28 +0200
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     <yossiku@...lanox.com>
CC:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        "Hideaki YOSHIFUJI" <yoshfuji@...ux-ipv6.org>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <borisp@...lanox.com>, <kliteyn@...lanox.com>
Subject: Re: [PATCH net-next] xfrm: Add support for network devices capable
 of removing the ESP trailer

On Wed, Aug 30, 2017 at 11:30:39AM +0300, yossiku@...lanox.com wrote:
> From: Yossi Kuperman <yossiku@...lanox.com>
> 
> In conjunction with crypto offload [1], removing the ESP trailer by
> hardware can potentially improve the performance by avoiding (1) a
> cache miss incurred by reading the nexthdr field and (2) the necessity
> to calculate the csum value of the trailer in order to keep skb->csum
> valid.
> 
> This patch introduces the changes to the xfrm stack and merely serves
> as an infrastructure. Subsequent patch to mlx5 driver will put this to
> a good use.
> 
> [1] https://www.mail-archive.com/netdev@vger.kernel.org/msg175733.html
> 
> Signed-off-by: Yossi Kuperman <yossiku@...lanox.com>

Applied to ipsec-next, thanks Yossi!