Re: [PATCH] vhost: support UDP Fragmentation Offload

[Yuanhan Liu <yliu@fridaylinux.org>]

On Tue, Nov 21, 2017 at 02:56:52PM +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 <jiayu.hu@intel.com>
> ---
>  lib/librte_mbuf/rte_mbuf.h    |  7 +++++++
>  lib/librte_vhost/vhost.h      |  2 ++
>  lib/librte_vhost/virtio_net.c | 10 ++++++++++
>  3 files changed, 19 insertions(+)
> 
> diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h
> index ce8a05d..3d8cfc9 100644
> --- a/lib/librte_mbuf/rte_mbuf.h
> +++ b/lib/librte_mbuf/rte_mbuf.h
> @@ -209,6 +209,13 @@ extern "C" {
>  /* add new TX flags here */
>  
>  /**
> + * UDP Fragmentation Offload flag. This flag is used for enabling UDP
> + * fragmentation in SW or in HW. When use UFO, mbuf->tso_segsz is used
> + * to store the MSS of UDP fragments.
> + */
> +#define PKT_TX_UDP_SEG	(1ULL << 42)

This patch added a new mbuf flag, Olivier, do you have objections?

	--yliu