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Date:   Mon, 12 Dec 2022 09:40:16 +0000
To:     Andrew Melnychenko <>
Subject: Re: [PATCH v5 0/6] TUN/VirtioNet USO features support.


This series was applied to netdev/net-next.git (master)
by David S. Miller <>:

On Wed,  7 Dec 2022 13:35:52 +0200 you wrote:
> Added new offloads for TUN devices TUN_F_USO4 and TUN_F_USO6.
> Technically they enable NETIF_F_GSO_UDP_L4
> (and only if USO4 & USO6 are set simultaneously).
> It allows the transmission of large UDP packets.
> UDP Segmentation Offload (USO/GSO_UDP_L4) - ability to split UDP packets
> into several segments. It's similar to UFO, except it doesn't use IP
> fragmentation. The drivers may push big packets and the NIC will split
> them(or assemble them in case of receive), but in the case of VirtioNet
> we just pass big UDP to the host. So we are freeing the driver from doing
> the unnecessary job of splitting. The same thing for several guests
> on one host, we can pass big packets between guests.
> [...]

Here is the summary with links:
  - [v5,1/6] udp: allow header check for dodgy GSO_UDP_L4 packets.
  - [v5,2/6] uapi/linux/if_tun.h: Added new offload types for USO4/6.
  - [v5,3/6] driver/net/tun: Added features for USO.
  - [v5,4/6] uapi/linux/virtio_net.h: Added USO types.
  - [v5,5/6] linux/virtio_net.h: Support USO offload in vnet header.
  - [v5,6/6] drivers/net/virtio_net.c: Added USO support.

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