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

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Message-Id: <20210511044253.469034-3-yuri.benditovich@daynix.com>
Date:   Tue, 11 May 2021 07:42:51 +0300
From:   Yuri Benditovich <yuri.benditovich@...nix.com>
To:     davem@...emloft.net, kuba@...nel.org, mst@...hat.com,
        jasowang@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Cc:     yan@...nix.com
Subject: [PATCH 2/4] virtio-net: add support of UDP segmentation (USO) on the host

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;
 		default:
 			return -EINVAL;
 		}
-- 
2.26.3