netdev - Re: [PATCH net] macvtap: unbreak receiving of gro skb with frag list

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Date:	Fri, 23 Oct 2015 16:37:38 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Jason Wang <jasowang@...hat.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Vlad Yasevich <vyasevic@...hat.com>
Subject: Re: [PATCH net] macvtap: unbreak receiving of gro skb with frag list

On Fri, Oct 23, 2015 at 12:57:05AM -0400, Jason Wang wrote:
> We don't have fraglist support in TAP_FEATURES. This will lead
> software segmentation of gro skb with frag list. Fixes by having
> frag list support in TAP_FEATURES.
> 
> With this patch single session of netperf receiving were restored from
> about 5Gb/s to about 12Gb/s on mlx4.
> 
> Fixes a567dd6252 ("macvtap: simplify usage of tap_features")
> Cc: Vlad Yasevich <vyasevic@...hat.com>
> Cc: Michael S. Tsirkin <mst@...hat.com>
> Signed-off-by: Jason Wang <jasowang@...hat.com>

Thanks!
Does this mean we should look at re-adding NETIF_F_FRAGLIST
to virtio-net as well?

> ---
>  drivers/net/macvtap.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
> index 248478c..197c939 100644
> --- a/drivers/net/macvtap.c
> +++ b/drivers/net/macvtap.c
> @@ -137,7 +137,7 @@ static const struct proto_ops macvtap_socket_ops;
>  #define TUN_OFFLOADS (NETIF_F_HW_CSUM | NETIF_F_TSO_ECN | NETIF_F_TSO | \
>  		      NETIF_F_TSO6 | NETIF_F_UFO)
>  #define RX_OFFLOADS (NETIF_F_GRO | NETIF_F_LRO)
> -#define TAP_FEATURES (NETIF_F_GSO | NETIF_F_SG)
> +#define TAP_FEATURES (NETIF_F_GSO | NETIF_F_SG | NETIF_F_FRAGLIST)
>  
>  static struct macvlan_dev *macvtap_get_vlan_rcu(const struct net_device *dev)
>  {
> -- 
> 1.8.3.1
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