netdev - Re: [PATCH 2/4] virtio-net: add support of UDP segmentation (USO) on the host

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Date:   Tue, 11 May 2021 14:47:39 +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 2/4] virtio-net: add support of UDP segmentation (USO) on
 the host


在 2021/5/11 下午12:42, Yuri Benditovich 写道:
> Large UDP packet provided by the guest with GSO type set to
> VIRTIO_NET_HDR_GSO_UDP_L4 will be divided to several UDP
> packets according to the gso_size field.
>
> Signed-off-by: Yuri Benditovich <yuri.benditovich@...nix.com>
> ---
>   include/linux/virtio_net.h | 5 +++++
>   1 file changed, 5 insertions(+)
>
> diff --git a/include/linux/virtio_net.h b/include/linux/virtio_net.h
> index b465f8f3e554..4ecf9a1ca912 100644
> --- a/include/linux/virtio_net.h
> +++ b/include/linux/virtio_net.h
> @@ -51,6 +51,11 @@ static inline int virtio_net_hdr_to_skb(struct sk_buff *skb,
>   			ip_proto = IPPROTO_UDP;
>   			thlen = sizeof(struct udphdr);
>   			break;
> +		case VIRTIO_NET_HDR_GSO_UDP_L4:
> +			gso_type = SKB_GSO_UDP_L4;
> +			ip_proto = IPPROTO_UDP;
> +			thlen = sizeof(struct udphdr);
> +			break;


This is only for rx, how about tx?

Thanks



>   		default:
>   			return -EINVAL;
>   		}