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SubjectRe: [RFC PATCH 0/5] TUN/VirtioNet USO features support.
On Wed, Jan 26, 2022 at 9:54 AM Xuan Zhuo <xuanzhuo@linux.alibaba.com> wrote:
>
> On Tue, 25 Jan 2022 10:46:57 +0200, 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
>
> Seems like this hasn't been upvoted yet.
>
> https://github.com/oasis-tcs/virtio-spec#use-of-github-issues

Yes, correct. This is a reason why this series of patches is RFC.

>
> Thanks.
>
> >
> > Also, there is a known issue with transmitting packages between two guests.
> > Without hacks with skb's GSO - packages are still segmented on the host's postrouting.
> >
> > Andrew Melnychenko (5):
> > uapi/linux/if_tun.h: Added new ioctl for tun/tap.
> > driver/net/tun: Added features for USO.
> > uapi/linux/virtio_net.h: Added USO types.
> > linux/virtio_net.h: Added Support for GSO_UDP_L4 offload.
> > drivers/net/virtio_net.c: Added USO support.
> >
> > drivers/net/tap.c | 18 ++++++++++++++++--
> > drivers/net/tun.c | 15 ++++++++++++++-
> > drivers/net/virtio_net.c | 22 ++++++++++++++++++----
> > include/linux/virtio_net.h | 11 +++++++++++
> > include/uapi/linux/if_tun.h | 3 +++
> > include/uapi/linux/virtio_net.h | 4 ++++
> > 6 files changed, 66 insertions(+), 7 deletions(-)
> >
> > --
> > 2.34.1
> >
> > _______________________________________________
> > Virtualization mailing list
> > Virtualization@lists.linux-foundation.org
> > https://lists.linuxfoundation.org/mailman/listinfo/virtualization

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