linux-kernel - Re: [RFC PATCH 4/5] linux/virtio_net.h: Added Support for GSO_UDP

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Date:   Wed, 9 Feb 2022 12:42:26 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Andrew Melnychenko <andrew@...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:     yuri.benditovich@...nix.com, yan@...nix.com
Subject: Re: [RFC PATCH 4/5] linux/virtio_net.h: Added Support for GSO_UDP_L4
 offload.


在 2022/1/25 下午4:47, Andrew Melnychenko 写道:
> Now, it's possible to convert vnet packets from/to skb.


I suggest to change the title to "net: support XXX offload in vnet header"

Thanks


>
> Signed-off-by: Andrew Melnychenko <andrew@...nix.com>
> ---
>   include/linux/virtio_net.h | 11 +++++++++++
>   1 file changed, 11 insertions(+)
>
> diff --git a/include/linux/virtio_net.h b/include/linux/virtio_net.h
> index a960de68ac69..9311d41d0a81 100644
> --- a/include/linux/virtio_net.h
> +++ b/include/linux/virtio_net.h
> @@ -17,6 +17,9 @@ static inline bool virtio_net_hdr_match_proto(__be16 protocol, __u8 gso_type)
>   	case VIRTIO_NET_HDR_GSO_UDP:
>   		return protocol == cpu_to_be16(ETH_P_IP) ||
>   		       protocol == cpu_to_be16(ETH_P_IPV6);
> +	case VIRTIO_NET_HDR_GSO_UDP_L4:
> +		return protocol == cpu_to_be16(ETH_P_IP) ||
> +		       protocol == cpu_to_be16(ETH_P_IPV6);
>   	default:
>   		return false;
>   	}
> @@ -31,6 +34,7 @@ static inline int virtio_net_hdr_set_proto(struct sk_buff *skb,
>   	switch (hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
>   	case VIRTIO_NET_HDR_GSO_TCPV4:
>   	case VIRTIO_NET_HDR_GSO_UDP:
> +	case VIRTIO_NET_HDR_GSO_UDP_L4:
>   		skb->protocol = cpu_to_be16(ETH_P_IP);
>   		break;
>   	case VIRTIO_NET_HDR_GSO_TCPV6:
> @@ -69,6 +73,11 @@ 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;
>   		default:
>   			return -EINVAL;
>   		}
> @@ -182,6 +191,8 @@ static inline int virtio_net_hdr_from_skb(const struct sk_buff *skb,
>   			hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
>   		else if (sinfo->gso_type & SKB_GSO_TCPV6)
>   			hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
> +		else if (sinfo->gso_type & SKB_GSO_UDP_L4)
> +			hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP_L4;
>   		else
>   			return -EINVAL;
>   		if (sinfo->gso_type & SKB_GSO_TCP_ECN)