From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp.tuxdriver.com (charlotte.tuxdriver.com [70.61.120.58]) by dpdk.org (Postfix) with ESMTP id D8B04237 for ; Tue, 21 Nov 2017 15:34:13 +0100 (CET) Received: from cpe-2606-a000-111b-423c-e874-da8e-c543-d863.dyn6.twc.com ([2606:a000:111b:423c:e874:da8e:c543:d863] helo=localhost) by smtp.tuxdriver.com with esmtpsa (TLSv1:AES256-SHA:256) (Exim 4.63) (envelope-from ) id 1eH9cT-00068C-FZ; Tue, 21 Nov 2017 09:34:02 -0500 Date: Tue, 21 Nov 2017 09:33:16 -0500 From: Neil Horman To: "Hu, Jiayu" Cc: Stephen Hemminger , "dev@dpdk.org" , "yliu@fridaylinux.org" , "Tan, Jianfeng" Message-ID: <20171121143316.GA1753@hmswarspite.think-freely.org> References: <1511247412-130965-1-git-send-email-jiayu.hu@intel.com> <20171120231236.399555e6@xeon-e3> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.1 (2017-09-22) X-Spam-Score: -2.9 (--) X-Spam-Status: No Subject: Re: [dpdk-dev] [PATCH] vhost: support UDP Fragmentation Offload X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 21 Nov 2017 14:34:14 -0000 On Tue, Nov 21, 2017 at 07:41:00AM +0000, Hu, Jiayu wrote: > Hi Stephen, > > > -----Original Message----- > > From: Stephen Hemminger [mailto:stephen@networkplumber.org] > > Sent: Tuesday, November 21, 2017 3:13 PM > > To: Hu, Jiayu > > Cc: dev@dpdk.org; yliu@fridaylinux.org; Tan, Jianfeng > > > > Subject: Re: [dpdk-dev] [PATCH] vhost: support UDP Fragmentation Offload > > > > On Tue, 21 Nov 2017 14:56:52 +0800 > > Jiayu Hu wrote: > > > > > In virtio, UDP Fragmentation Offload (UFO) includes two parts: host UFO > > > and guest UFO. Guest UFO means the frontend can receive large UDP > > packets, > > > and host UFO means the backend can receive large UDP packets. This patch > > > supports host UFO and guest UFO for vhost-user. > > > > > > Signed-off-by: Jiayu Hu > > > > This may no longer be a desirable feature to implement. > > UFO was just deprecated and removed from Linux. > > It had no useful benefit. > > The main reason of supporting UFO is to make the backend live migration from > vhost-net to vhost-user possible. Host and guest UFO are default features for virtio-net, > and vhost-net supports both. But vhosy-user doesn't support them. If we want to > migrate from vhost-net to vhost-user, this features gap would cause live migration fail. > > Thanks, > Jiayu > Its not a widely used feature, but if it helps migrage people, its not a hard feature to support Acked-by: Neil Horman