In the medium term, we plan to migrate the datapath to use Netlink as its
communication channel. In the short term, we need to be able to have
actions with 64-bit arguments but "struct odp_action" only has room for
48 bits. So this patch shifts to variable-length arguments using Netlink
attributes, which starts in on the Netlink transition and makes 64-bit
arguments possible at the same time.
Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Jesse Gross <jesse@nicira.com>
Our normal loop detection requires disabling preemption while
packet processing takes place. On RT kernels this isn't acceptable
and interacts badly with spinlocks, so we can't use it. This
takes advantage of some extra space that is added to struct
task_struct on RT kernels (and the knowledge that we will always
have a valid task_struct) to store the loop counter for a given
thread. Since we can't make these assumptions on non-RT kernels,
we continue to use the previous method of loop detection there.
Signed-off-by: Jesse Gross <jesse@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
