net: xdp: support xdp generic on virtual devices
authorJohn Fastabend <john.fastabend@gmail.com>
Mon, 17 Jul 2017 16:26:45 +0000 (09:26 -0700)
committerDavid S. Miller <davem@davemloft.net>
Mon, 17 Jul 2017 16:48:05 +0000 (09:48 -0700)
commitd445516966dcb2924741b13b27738b54df2af01a
treea93bc06b2cf7176add789cc2368a029d9bafcab6
parent90382dca61137444cb8f639db0a76c4d084763d7
net: xdp: support xdp generic on virtual devices

XDP generic allows users to test XDP programs and/or run them with
degraded performance on devices that do not yet support XDP. For
testing I typically test eBPF programs using a set of veth devices.
This allows testing topologies that would otherwise be difficult to
setup especially in the early stages of development.

This patch adds a xdp generic hook to the netif_rx_internal()
function which is called from dev_forward_skb(). With this addition
attaching XDP programs to veth devices works as expected! Also I
noticed multiple drivers using netif_rx(). These devices will also
benefit and generic XDP will work for them as well.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Tested-by: Andy Gospodarek <andy@greyhouse.net>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/core/dev.c