On Thu, Dec 01, 2022 at 11:56:38PM +0200, Andrew Melnychenko 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. > > 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. > > New types for virtio-net already in virtio-net specification: > https://github.com/oasis-tcs/virtio-spec/issues/120 > > Test it WIP Qemu https://github.com/daynix/qemu/tree/USOv3 > > 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. > > Andrew Melnychenko (1): > udp: allow header check for dodgy GSO_UDP_L4 packets. I don't see patches except 0 on list. > drivers/net/tap.c | 10 ++++++++-- > drivers/net/tun.c | 8 +++++++- > drivers/net/virtio_net.c | 24 +++++++++++++++++++++--- > include/linux/virtio_net.h | 9 +++++++++ > include/uapi/linux/if_tun.h | 2 ++ > include/uapi/linux/virtio_net.h | 5 +++++ > net/ipv4/udp_offload.c | 3 ++- > net/ipv6/udp_offload.c | 3 ++- > 8 files changed, 56 insertions(+), 8 deletions(-) > > -- > 2.38.1 > > _______________________________________________ > Virtualization mailing list > Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx > https://lists.linuxfoundation.org/mailman/listinfo/virtualization > _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
