From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <yuanhan.liu@linux.intel.com>
Received: from mga09.intel.com (mga09.intel.com [134.134.136.24])
 by dpdk.org (Postfix) with ESMTP id D5D52A2F;
 Thu, 13 Oct 2016 08:18:00 +0200 (CEST)
Received: from orsmga001.jf.intel.com ([10.7.209.18])
 by orsmga102.jf.intel.com with ESMTP; 12 Oct 2016 23:18:01 -0700
X-ExtLoop1: 1
X-IronPort-AV: E=Sophos;i="5.31,338,1473145200"; d="scan'208";a="1044037914"
Received: from yliu-dev.sh.intel.com (HELO yliu-dev) ([10.239.67.162])
 by orsmga001.jf.intel.com with ESMTP; 12 Oct 2016 23:17:58 -0700
Date: Thu, 13 Oct 2016 14:18:51 +0800
From: Yuanhan Liu <yuanhan.liu@linux.intel.com>
To: Zhihong Wang <zhihong.wang@intel.com>
Cc: dev@dpdk.org, maxime.coquelin@redhat.com, thomas.monjalon@6wind.com,
 stable@dpdk.org
Message-ID: <20161013061851.GZ10323@yliu-dev.sh.intel.com>
References: <1471319402-112998-1-git-send-email-zhihong.wang@intel.com>
 <1474336817-22683-1-git-send-email-zhihong.wang@intel.com>
 <1474336817-22683-2-git-send-email-zhihong.wang@intel.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <1474336817-22683-2-git-send-email-zhihong.wang@intel.com>
User-Agent: Mutt/1.5.23 (2014-03-12)
Subject: Re: [dpdk-dev] [dpdk-stable] [PATCH v6 1/6] vhost: fix windows vm
	hang
X-BeenThere: dev@dpdk.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: patches and discussions about DPDK <dev.dpdk.org>
List-Unsubscribe: <http://dpdk.org/ml/options/dev>,
 <mailto:dev-request@dpdk.org?subject=unsubscribe>
List-Archive: <http://dpdk.org/ml/archives/dev/>
List-Post: <mailto:dev@dpdk.org>
List-Help: <mailto:dev-request@dpdk.org?subject=help>
List-Subscribe: <http://dpdk.org/ml/listinfo/dev>,
 <mailto:dev-request@dpdk.org?subject=subscribe>
X-List-Received-Date: Thu, 13 Oct 2016 06:18:01 -0000

On Mon, Sep 19, 2016 at 10:00:12PM -0400, Zhihong Wang wrote:
> This patch fixes a Windows VM compatibility issue in DPDK 16.07 vhost code
> which causes the guest to hang once any packets are enqueued when mrg_rxbuf
> is turned on by setting the right id and len in the used ring.
> 
> As defined in virtio spec 0.95 and 1.0, in each used ring element, id means
> index of start of used descriptor chain, and len means total length of the
> descriptor chain which was written to. While in 16.07 code, index of the
> last descriptor is assigned to id, and the length of the last descriptor is
> assigned to len.
> 
> How to test?
> 
>  1. Start testpmd in the host with a vhost port.
> 
>  2. Start a Windows VM image with qemu and connect to the vhost port.
> 
>  3. Start io forwarding with tx_first in host testpmd.
> 
> For 16.07 code, the Windows VM will hang once any packets are enqueued.
> 
> Cc: <stable@dpdk.org>
> Signed-off-by: Zhihong Wang <zhihong.wang@intel.com>

Applied to dpdk-next-virtio (this patch only).

Thanks.

	--yliu