On Wed, Jan 26, 2022 at 9:54 AM Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx> wrote: > > On Tue, 25 Jan 2022 10:46:57 +0200, Andrew Melnychenko <andrew@xxxxxxxxxx> 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@xxxxxxxxxxxxxxxxxxxxxxxxxx > > https://lists.linuxfoundation.org/mailman/listinfo/virtualization _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
