[PATCH net-next V2 0/3] XDP support for tap

Path	csiph.com!news.mixmin.net!aioe.org!bofh.it!news.nic.it!robomod
From	Jason Wang <jasowang@redhat.com>
Newsgroups	linux.kernel
Subject	[PATCH net-next V2 0/3] XDP support for tap
Date	Fri, 11 Aug 2017 13:50:03 +0200
Message-ID	<udgBY-315-9@gated-at.bofh.it> (permalink)
X-Original-To	davem@davemloft.net, mst@redhat.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Dmarc-Filter	OpenDMARC Filter v1.3.2 mx1.redhat.com CEB89C04DBCF
Authentication-Results	ext-mx08.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com
Authentication-Results	ext-mx08.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=jasowang@redhat.com
X-Scanned-By	MIMEDefang 2.79 on 10.5.11.11
X-Greylist	Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.32]); Fri, 11 Aug 2017 11:41:28 +0000 (UTC)
Sender	robomod@news.nic.it
List-ID	<linux-kernel.vger.kernel.org>
X-Mailing-List	linux-kernel@vger.kernel.org
Approved	robomod@news.nic.it
Lines	33
Organization	linux.* mail to news gateway
X-Original-Cc	kubakici@wp.pl, Jason Wang <jasowang@redhat.com>
X-Original-Date	Fri, 11 Aug 2017 19:41:15 +0800
X-Original-Message-ID	<1502451678-17358-1-git-send-email-jasowang@redhat.com>
X-Original-Sender	linux-kernel-owner@vger.kernel.org
Xref	csiph.com linux.kernel:1709500

Show key headers only | View raw

Hi all:

This series tries to implement XDP support for tap. Two path were
implemented:

- fast path: small & non-gso packet, For performance reason we do it
  at page level and use build_skb() to create skb if necessary.
- slow path: big or gso packet, we don't want to lose the capability
  compared to generic XDP, so we export some generic xdp helpers and
  do it after skb was created.

xdp1 shows about 41% improvement, xdp_redirect shows about 60%
improvement.

Changes from V1:
- fix the race between xdp set and free
- don't hold extra refcount
- add XDP_REDIRECT support

Please review.

Jason Wang (3):
  tap: use build_skb() for small packet
  net: export some generic xdp helpers
  tap: XDP support

 drivers/net/tun.c         | 247 ++++++++++++++++++++++++++++++++++++++++++----
 include/linux/netdevice.h |   2 +
 net/core/dev.c            |  14 +--
 3 files changed, 236 insertions(+), 27 deletions(-)

-- 
2.7.4

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

[PATCH net-next V2 0/3] XDP support for tap Jason Wang <jasowang@redhat.com> - 2017-08-11 13:50 +0200
  [PATCH net-next V2 1/3] tap: use build_skb() for small packet Jason Wang <jasowang@redhat.com> - 2017-08-11 13:50 +0200

csiph-web