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

From: Jason Wang
Date: Fri Aug 11 2017 - 07:43:01 EST


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(-)

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2.7.4