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SubjectRe: [RFC PATCH v2 0/5] TUN/VirtioNet USO features support.
On Thu, May 12, 2022 at 7:33 PM Andrew Melnychenko <andrew@daynix.com> 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 to transmission of large UDP packets.
>
> Different features USO4 and USO6 are required for qemu where Windows guests can
> enable disable USO receives for IPv4 and IPv6 separately.
> On the other side, Linux can't really differentiate USO4 and USO6, for now.
> For now, to enable USO for TUN it requires enabling USO4 and USO6 together.
> In the future, there would be a mechanism to control UDP_L4 GSO separately.
>
> Test it WIP Qemu https://github.com/daynix/qemu/tree/Dev_USOv2
>
> New types for VirtioNet already on mailing:
> https://lists.oasis-open.org/archives/virtio-comment/202110/msg00010.html
>
> Also, there is a known issue with transmitting packages between two guests.

Could you explain this more? It looks like a bug. (Or any pointer to
the discussion)

Thanks

> Without hacks with skb's GSO - packages are still segmented on the host's postrouting.
>
> Andrew (5):
> uapi/linux/if_tun.h: Added new offload types for USO4/6.
> driver/net/tun: Added features for USO.
> uapi/linux/virtio_net.h: Added USO types.
> linux/virtio_net.h: Support USO offload in vnet header.
> drivers/net/virtio_net.c: Added USO support.
>
> drivers/net/tap.c | 10 ++++++++--
> drivers/net/tun.c | 8 +++++++-
> drivers/net/virtio_net.c | 19 +++++++++++++++----
> include/linux/virtio_net.h | 9 +++++++++
> include/uapi/linux/if_tun.h | 2 ++
> include/uapi/linux/virtio_net.h | 4 ++++
> 6 files changed, 45 insertions(+), 7 deletions(-)
>
> --
> 2.35.1
>

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