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Date: Mon, 2 Dec 2019 10:44:37 +0800 From: Jason Wang <jasowang@...hat.com> To: David Ahern <dsahern@...il.com>, Prashant Bhole <prashantbhole.linux@...il.com>, "David S . Miller" <davem@...emloft.net>, "Michael S . Tsirkin" <mst@...hat.com> Cc: 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 2019/12/2 上午12:35, David Ahern wrote: > 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. >> >> Signed-off-by: Jason Wang <jasowang@...hat.com> >> Signed-off-by: Prashant Bhole <prashantbhole.linux@...il.com> >> --- >> drivers/net/tun.c | 19 ++++++++++++++----- >> include/uapi/linux/if_tun.h | 1 + >> 2 files changed, 15 insertions(+), 5 deletions(-) >> >> diff --git a/drivers/net/tun.c b/drivers/net/tun.c >> index d078b4659897..ecb49101b0b5 100644 >> --- a/drivers/net/tun.c >> +++ b/drivers/net/tun.c >> @@ -241,6 +241,7 @@ struct tun_struct { >> struct bpf_prog __rcu *xdp_prog; >> struct tun_prog __rcu *steering_prog; >> struct tun_prog __rcu *filter_prog; >> + struct tun_prog __rcu *offloaded_xdp_prog; > I have been looking into running XDP pograms in the TX path of a tap > device [1] where the program is installed and managed by a process in > the host. The code paths are the same as what you are doing with XDP > offload, so how about calling this xdp_prog_tx? > > [1] > https://github.com/dsahern/linux/commit/f2303d05187c8a604cdb70b288338e9b1d1b0db6 > I think it's fine, btw, except for the netlink part there should be no much difference. Thanks
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