From: Toshiaki Makita <makita.toshi...@lab.ntt.co.jp> This patch set introduces driver XDP for veth. Basically this is used in conjunction with redirect action of another XDP program.
NIC -----------> veth===veth (XDP) (redirect) (XDP) In this case xdp_frame can be forwarded to the peer veth without modification, so we can expect far better performance than generic XDP. The envisioned use cases are: * Container managed XDP program Container host redirects frames to containers by XDP redirect action, and privileged containers can deploy their own XDP programs. * XDP program cascading Two or more XDP programs can be called for each packet by redirecting xdp frames to veth. * Internal interface for an XDP bridge When using XDP redirection to create a virtual bridge, veth can be used to create an internal interface for the bridge. With single core and simple XDP programs which only redirect and drop packets, I got 10.5 Mpps redirect/drop rate with i40e 25G NIC + veth. XXV710 (i40e) --- (XDP redirect) --> veth===veth (XDP drop) This changeset is making use of NAPI to implement ndo_xdp_xmit and XDP_TX/REDIRECT. This is mainly because I wanted to avoid stack inflation by recursive calling of XDP programs. As an RFC this has not implemented recently introduced xdp_adjust_tail and based on top of Jesper's redirect memory return API patch set (684009d4fdaf). Any feedback is welcome. Thanks! Toshiaki Makita (9): net: Export skb_headers_offset_update and skb_copy_header veth: Add driver XDP veth: Avoid drops by oversized packets when XDP is enabled veth: Use NAPI for XDP veth: Handle xdp_frame in xdp napi ring veth: Add ndo_xdp_xmit veth: Add XDP TX and REDIRECT veth: Avoid per-packet spinlock of XDP napi ring on dequeueing veth: Avoid per-packet spinlock of XDP napi ring on enqueueing drivers/net/veth.c | 688 +++++++++++++++++++++++++++++++++++++++++++++++-- include/linux/filter.h | 16 ++ include/linux/skbuff.h | 2 + net/core/filter.c | 11 +- net/core/skbuff.c | 12 +- 5 files changed, 699 insertions(+), 30 deletions(-) -- 2.14.3
