tree 852b76177b94ed322cc38f54bcce7cc052abea65
parent 1ca467343240be738c8e61edd4b421ca9ebe2d77
author Paul Durrant <Paul.Durrant@citrix.com> 1463128646 +0100
committer David S. Miller <davem@davemloft.net> 1463420156 -0400

xen-netback: add control ring boilerplate

My recent patch to include/xen/interface/io/netif.h defines a new shared
ring (in addition to the rx and tx rings) for passing control messages
from a VM frontend driver to a backend driver.

This patch adds the necessary code to xen-netback to map this new shared
ring, should it be created by a frontend, but does not add implementations
for any of the defined protocol messages. These are added in a subsequent
patch for clarity.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>