linux-kernel - Re: [PATCH 4/4] tun: indicate support for USO feature

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Date:   Tue, 11 May 2021 14:50:01 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Yuri Benditovich <yuri.benditovich@...nix.com>,
        davem@...emloft.net, kuba@...nel.org, mst@...hat.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Cc:     yan@...nix.com
Subject: Re: [PATCH 4/4] tun: indicate support for USO feature


在 2021/5/11 下午12:42, Yuri Benditovich 写道:
> Signed-off-by: Yuri Benditovich <yuri.benditovich@...nix.com>
> ---
>   drivers/net/tun.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/tun.c b/drivers/net/tun.c
> index 84f832806313..a35054f9d941 100644
> --- a/drivers/net/tun.c
> +++ b/drivers/net/tun.c
> @@ -2812,7 +2812,7 @@ static int set_offload(struct tun_struct *tun, unsigned long arg)
>   			arg &= ~(TUN_F_TSO4|TUN_F_TSO6);
>   		}
>   
> -		arg &= ~TUN_F_UFO;
> +		arg &= ~(TUN_F_UFO|TUN_F_USO);


It looks to me kernel doesn't use "USO", so TUN_F_UDP_GSO_L4 is a better 
name for this and I guess we should toggle NETIF_F_UDP_GSO_l4 here?

And how about macvtap?

Thanks


>   	}
>   
>   	/* This gives the user a way to test for new features in future by