netdev - Re: [PATCH v4 0/6] TUN/VirtioNet USO features support.

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Date:   Fri, 2 Dec 2022 00:35:03 +0200
From:   Andrew Melnichenko <andrew@...nix.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, jasowang@...hat.com, yoshfuji@...ux-ipv6.org,
        dsahern@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, devel@...nix.com
Subject: Re: [PATCH v4 0/6] TUN/VirtioNet USO features support.

Sorry, got issues with the internet during sending it. Now, all should be done.

On Fri, Dec 2, 2022 at 12:33 AM Michael S. Tsirkin <mst@...hat.com> wrote:
>
> 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@...ts.linux-foundation.org
> > https://lists.linuxfoundation.org/mailman/listinfo/virtualization
> >
>

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