From mboxrd@z Thu Jan  1 00:00:00 1970
From: Olivier MATZ <olivier.matz@6wind.com>
Subject: Re: [PATCH v3 5/8] vhost: claim that we support
 GUEST_ANNOUNCE feature
Date: Fri, 11 Mar 2016 13:39:38 +0100
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To: Yuanhan Liu <yuanhan.liu@linux.intel.com>, dev@dpdk.org
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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