From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by dpdk.org (Postfix) with ESMTP id DCEBDF04 for ; Tue, 21 Nov 2017 08:42:02 +0100 (CET) Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga101.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 20 Nov 2017 23:42:01 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.44,432,1505804400"; d="scan'208";a="4174875" Received: from fmsmsx106.amr.corp.intel.com ([10.18.124.204]) by FMSMGA003.fm.intel.com with ESMTP; 20 Nov 2017 23:42:01 -0800 Received: from shsmsx104.ccr.corp.intel.com (10.239.4.70) by FMSMSX106.amr.corp.intel.com (10.18.124.204) with Microsoft SMTP Server (TLS) id 14.3.319.2; Mon, 20 Nov 2017 23:42:00 -0800 Received: from shsmsx102.ccr.corp.intel.com ([169.254.2.175]) by SHSMSX104.ccr.corp.intel.com ([169.254.5.152]) with mapi id 14.03.0319.002; Tue, 21 Nov 2017 15:41:02 +0800 From: "Hu, Jiayu" To: Stephen Hemminger CC: "dev@dpdk.org" , "yliu@fridaylinux.org" , "Tan, Jianfeng" Thread-Topic: [dpdk-dev] [PATCH] vhost: support UDP Fragmentation Offload Thread-Index: AQHTYpWadNe6Ktel006poICAty1NgqMd5O8AgACMQhA= Date: Tue, 21 Nov 2017 07:41:00 +0000 Message-ID: References: <1511247412-130965-1-git-send-email-jiayu.hu@intel.com> <20171120231236.399555e6@xeon-e3> In-Reply-To: <20171120231236.399555e6@xeon-e3> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-product: dlpe-windows dlp-version: 11.0.0.116 dlp-reaction: no-action x-titus-metadata-40: eyJDYXRlZ29yeUxhYmVscyI6IiIsIk1ldGFkYXRhIjp7Im5zIjoiaHR0cDpcL1wvd3d3LnRpdHVzLmNvbVwvbnNcL0ludGVsMyIsImlkIjoiOGVkZDg0OTItMjJiZC00ZDVhLWI3YzItNmIyNDNiNzk3YzMwIiwicHJvcHMiOlt7Im4iOiJDVFBDbGFzc2lmaWNhdGlvbiIsInZhbHMiOlt7InZhbHVlIjoiQ1RQX0lDIn1dfV19LCJTdWJqZWN0TGFiZWxzIjpbXSwiVE1DVmVyc2lvbiI6IjE2LjUuOS4zIiwiVHJ1c3RlZExhYmVsSGFzaCI6IkpIbEdXd05QXC9hbEtONG9vRkxaY1VLTHJzOVl0T3ZrM2JWeXkydWMzSmZFPSJ9 x-ctpclassification: CTP_IC x-originating-ip: [10.239.127.40] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 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 07:42:03 -0000 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 >=20 > On Tue, 21 Nov 2017 14:56:52 +0800 > Jiayu Hu wrote: >=20 > > 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 patc= h > > supports host UFO and guest UFO for vhost-user. > > > > Signed-off-by: Jiayu Hu >=20 > 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 fro= m vhost-net to vhost-user possible. Host and guest UFO are default features f= or virtio-net, and vhost-net supports both. But vhosy-user doesn't support them. If we wan= t to migrate from vhost-net to vhost-user, this features gap would cause live mi= gration fail. Thanks, Jiayu