netdev - Re: [PATCH 2/2] Add UDP fragmentation features to Geneve devices

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Date: Tue, 25 Jun 2024 04:58:40 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: echken <chengcheng.luo@...rtx.com>, 
 davem@...emloft.net, 
 edumazet@...gle.com, 
 kuba@...nel.org, 
 pabeni@...hat.com
Cc: netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 echken <chengcheng.luo@...rtx.com>
Subject: Re: [PATCH 2/2] Add UDP fragmentation features to Geneve devices

echken wrote:
> Since Geneve devices do not support any offloading features for UDP
> fragmentation, large UDP packets sent through Geneve devices to the
> kernel protocol stack are preemptively fragmented in the TX direction of
> the Geneve device. The more computationally intensive encapsulation and
> routing processes occur after fragmentation, which leads to a
> significant increase in performance overhead in this scenario. By adding
> GSO_UDP and GSO_UDP_L4 to Geneve devices, we can ensure a significant
> reduction in the number of packets that undergo the computationally
> expensive Geneve encapsulation and routing processes in this scenario,
> thereby improving throughput performance.
> 
> Signed-off-by: echken <chengcheng.luo@...rtx.com>
> ---
>  drivers/net/geneve.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
> index 838e85ddec67..dc0f5846b415 100644
> --- a/drivers/net/geneve.c
> +++ b/drivers/net/geneve.c
> @@ -1198,10 +1198,14 @@ static void geneve_setup(struct net_device *dev)
>  	dev->features    |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_FRAGLIST;
>  	dev->features    |= NETIF_F_RXCSUM;
>  	dev->features    |= NETIF_F_GSO_SOFTWARE;
> +	dev->features    |= NETIF_F_GSO_UDP;

UFO is long deprecated. Nothing new should advertise it.

> +	dev->features    |= NETIF_F_GSO_UDP_L4;

NETIF_F_GSO_UDP_L4 is included in NETIF_F_GSO_SOFTWARE.