On 16-12-23 10:43 AM, John Fastabend wrote:

Add support for XDP adjust head by allocating a 256B header region
that XDP programs can grow into. This is only enabled when a XDP
program is loaded.

In order to ensure that we do not have to unwind queue headroom push
queue setup below bpf_prog_add. It reads better to do a prog ref
unwind vs another queue setup call.

TBD merge with Jason Wang's fixes, do a bit more testing, note
    big_packet support is removed by Jason as well.

Signed-off-by: John Fastabend <redacted>
---
 drivers/net/virtio_net.c |   53 +++++++++++++++++++++++++++++++---------------
 1 file changed, 36 insertions(+), 17 deletions(-)

ah dang, I sent this from the wrong tree so it was missing a fix sorry
for the noise. I'll send an update on top of net shortly.

.John