Paul Durrant 4e15ee2cb4
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 >
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4e15ee2cb4