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Date: Wed, 18 Dec 2019 17:10:36 +0900
From: Prashant Bhole <prashantbhole.linux@...il.com>
To: "David S . Miller" <davem@...emloft.net>,
"Michael S . Tsirkin" <mst@...hat.com>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Jesper Dangaard Brouer <hawk@...nel.org>
Cc: Prashant Bhole <prashantbhole.linux@...il.com>,
Jason Wang <jasowang@...hat.com>,
David Ahern <dsahern@...il.com>,
Jakub Kicinski <jakub.kicinski@...ronome.com>,
John Fastabend <john.fastabend@...il.com>,
Toshiaki Makita <toshiaki.makita1@...il.com>,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
Andrii Nakryiko <andriin@...com>, netdev@...r.kernel.org
Subject: [RFC net-next 00/14] XDP in tx path
This series introduces tx path XDP. RFC also includes usage of the
feature in tun driver. Later both can be posted separately. Another
possible use of this feature can be in veth driver. It can improve
container networking where veth pair links the host and the container.
Host can set ACL by setting tx path XDP to the veth iface.
It was originally a part of Jason Wang's work "XDP offload with
virtio-net" [1]. In order to simplify this work we decided to split
it and introduce tx path XDP separately in this set.
The performance improvment can be seen when an XDP program is attached
to tun tx path opposed to rx path in the guest.
* Case 1: When packets are XDP_REDIRECT'ed towards tun.
virtio-net rx XDP tun tx XDP
xdp1(XDP_DROP) 2.57 Mpps 12.90 Mpps
xdp2(XDP_TX) 1.53 Mpps 7.15 Mpps
* Case 2: When packets are pass through bridge towards tun
virtio-net rx XDP tun tx XDP
xdp1(XDP_DROP) 0.99 Mpps 1.00 Mpps
xdp2(XDP_TX) 1.19 Mpps 0.97 Mpps
Since this set modifies tun and vhost_net, below are the netperf
performance numbers.
Netperf_test Before After Difference
UDP_STREAM 18byte 90.14 88.77 -1.51%
UDP_STREAM 1472byte 6955 6658 -4.27%
TCP STREAM 9409 9402 -0.07%
UDP_RR 12658 13030 +2.93%
TCP_RR 12711 12831 +0.94%
XDP_REDIRECT will be handled later because we need to come up with
proper way to handle it in tx path.
Patches 1-4 are related to adding tx path XDP support.
Patches 5-14 implement tx path XDP in tun driver.
[1]: https://netdevconf.info/0x13/session.html?xdp-offload-with-virtio-net
David Ahern (2):
net: add tx path XDP support
tun: set tx path XDP program
Jason Wang (2):
net: core: rename netif_receive_generic_xdp() to do_generic_xdp_core()
net: core: export do_xdp_generic_core()
Prashant Bhole (10):
tools: sync kernel uapi/linux/if_link.h header
libbpf: API for tx path XDP support
samples/bpf: xdp1, add XDP tx support
tuntap: check tun_msg_ctl type at necessary places
vhost_net: user tap recvmsg api to access ptr ring
tuntap: remove usage of ptr ring in vhost_net
tun: run XDP program in tx path
tun: add a way to inject tx path packet into Rx path
tun: handle XDP_TX action of tx path XDP program
tun: run xdp prog when tun is read from file interface
drivers/net/tap.c | 42 +++--
drivers/net/tun.c | 278 +++++++++++++++++++++++++----
drivers/vhost/net.c | 77 ++++----
include/linux/if_tap.h | 5 -
include/linux/if_tun.h | 23 ++-
include/linux/netdevice.h | 6 +-
include/uapi/linux/if_link.h | 1 +
net/core/dev.c | 39 ++--
net/core/rtnetlink.c | 112 +++++++++++-
samples/bpf/xdp1_user.c | 28 ++-
tools/include/uapi/linux/if_link.h | 2 +
tools/lib/bpf/libbpf.h | 4 +
tools/lib/bpf/libbpf.map | 3 +
tools/lib/bpf/netlink.c | 77 +++++++-
14 files changed, 571 insertions(+), 126 deletions(-)
--
2.21.0
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