netdev - Re: [RFC net-next 07/18] tun: set offloaded xdp program

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Date:   Sun, 1 Dec 2019 09:45:46 -0700
From:   David Ahern <dsahern@...il.com>
To:     Prashant Bhole <prashantbhole.linux@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        "Michael S . Tsirkin" <mst@...hat.com>
Cc:     Jason Wang <jasowang@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>, netdev@...r.kernel.org,
        qemu-devel@...gnu.org, kvm@...r.kernel.org
Subject: Re: [RFC net-next 07/18] tun: set offloaded xdp program

On 11/26/19 4:07 AM, Prashant Bhole wrote:
> From: Jason Wang <jasowang@...hat.com>
> 
> This patch introduces an ioctl way to set an offloaded XDP program
> to tun driver. This ioctl will be used by qemu to offload XDP program
> from virtio_net in the guest.
> 

Seems like you need to set / reset the SOCK_XDP flag on tfile->sk since
this is an XDP program.

Also, why not add this program using netlink instead of ioctl? e.g., as
part of a generic XDP in the egress path like I am looking into for the
host side.