From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <olivier.matz@6wind.com>
Received: from mail.droids-corp.org (zoll.droids-corp.org [94.23.50.67])
 by dpdk.org (Postfix) with ESMTP id AD1A02BA2
 for <dev@dpdk.org>; Fri, 11 Mar 2016 13:39:56 +0100 (CET)
Received: from was59-1-82-226-113-214.fbx.proxad.net ([82.226.113.214]
 helo=[192.168.0.10])
 by mail.droids-corp.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128)
 (Exim 4.84) (envelope-from <olivier.matz@6wind.com>)
 id 1aeMNa-0000iL-HC; Fri, 11 Mar 2016 13:41:28 +0100
To: Yuanhan Liu <yuanhan.liu@linux.intel.com>, dev@dpdk.org
References: <1450321921-27799-1-git-send-email-yuanhan.liu@linux.intel.com>
 <1454043483-24579-1-git-send-email-yuanhan.liu@linux.intel.com>
 <1454043483-24579-6-git-send-email-yuanhan.liu@linux.intel.com>
From: Olivier MATZ <olivier.matz@6wind.com>
X-Enigmail-Draft-Status: N1110
Message-ID: <56E2BC8A.8070801@6wind.com>
Date: Fri, 11 Mar 2016 13:39:38 +0100
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101
 Icedove/38.6.0
MIME-Version: 1.0
In-Reply-To: <1454043483-24579-6-git-send-email-yuanhan.liu@linux.intel.com>
Content-Type: text/plain; charset=windows-1252
Content-Transfer-Encoding: 7bit
Subject: Re: [dpdk-dev] [PATCH v3 5/8] vhost: claim that we support
 GUEST_ANNOUNCE feature
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: Fri, 11 Mar 2016 12:39:56 -0000

Hi Yuanhan,

On 01/29/2016 05:58 AM, Yuanhan Liu wrote:
> It's actually a feature already enabled in Linux kernel (since v3.5).
> What we need to do is simply to claim that we support such feature,
> and nothing else.
> 
> With that, the guest will send an ARP message after live migration
> to notify the switches about the new location of migrated VM.
> 
> Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
> Tested-by: Pavel Fedin <p.fedin@samsung.com>
> ---
>  lib/librte_vhost/virtio-net.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/lib/librte_vhost/virtio-net.c b/lib/librte_vhost/virtio-net.c
> index 03044f6..0ba5045 100644
> --- a/lib/librte_vhost/virtio-net.c
> +++ b/lib/librte_vhost/virtio-net.c
> @@ -74,6 +74,7 @@ static struct virtio_net_config_ll *ll_root;
>  #define VHOST_SUPPORTED_FEATURES ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | \
>  				(1ULL << VIRTIO_NET_F_CTRL_VQ) | \
>  				(1ULL << VIRTIO_NET_F_CTRL_RX) | \
> +				(1ULL << VIRTIO_NET_F_GUEST_ANNOUNCE) | \
>  				(VHOST_SUPPORTS_MQ)            | \
>  				(1ULL << VIRTIO_F_VERSION_1)   | \
>  				(1ULL << VHOST_F_LOG_ALL)      | \
> 

I'm trying to compile the dpdk on an debian-7, and it fails due
to this patch. Indeed, the define VIRTIO_NET_F_GUEST_ANNOUNCE is
not present in /usr/include/linux/virtio_net.h on this distribution.

I'm wondering if the librte_vhost shouldn't embed its own version
of virtio_net.h instead of relying on the one from the distribution.
It seems it has been done this way for the virtio guest PMD in
dpdk.org/drivers/net/virtio/virtio_pci.h.

What do you think?


Thanks,
Olivier