vppinfra: add atomic macros for __sync builtins

This is first part of addition of atomic macros with only macros for
__sync builtins.

- Based on earlier patch by Damjan (https://gerrit.fd.io/r/#/c/10729/)
Additionally
- clib_atomic_release macro added and used in the absence
of any memory barrier.
- clib_atomic_bool_cmp_and_swap added

Change-Id: Ie4e48c1e184a652018d1d0d87c4be80ddd180a3b
Original-patch-by: Damjan Marion <damarion@cisco.com>
Signed-off-by: Sirshak Das <sirshak.das@arm.com>
Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Reviewed-by: Ola Liljedahl <ola.liljedahl@arm.com>
Reviewed-by: Steve Capper <steve.capper@arm.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/src/plugins/nat/nat_det.h b/src/plugins/nat/nat_det.h
index ce876bca9fb..7878a4c4ed6 100644
--- a/src/plugins/nat/nat_det.h
+++ b/src/plugins/nat/nat_det.h
@@ -159,13 +159,13 @@ snat_det_ses_create (snat_det_map_t * dm, ip4_address_t * in_addr,
     {
       if (!dm->sessions[i + user_offset].in_port)
 	{
-	  if (__sync_bool_compare_and_swap
+	  if (clib_atomic_bool_cmp_and_swap
 	      (&dm->sessions[i + user_offset].in_port, 0, in_port))
 	    {
 	      dm->sessions[i + user_offset].out.as_u64 = out->as_u64;
 	      dm->sessions[i + user_offset].state = SNAT_SESSION_UNKNOWN;
 	      dm->sessions[i + user_offset].expire = 0;
-	      __sync_add_and_fetch (&dm->ses_num, 1);
+	      clib_atomic_add_fetch (&dm->ses_num, 1);
 	      return &dm->sessions[i + user_offset];
 	    }
 	}
@@ -179,10 +179,10 @@ snat_det_ses_create (snat_det_map_t * dm, ip4_address_t * in_addr,
 always_inline void
 snat_det_ses_close (snat_det_map_t * dm, snat_det_session_t * ses)
 {
-  if (__sync_bool_compare_and_swap (&ses->in_port, ses->in_port, 0))
+  if (clib_atomic_bool_cmp_and_swap (&ses->in_port, ses->in_port, 0))
     {
       ses->out.as_u64 = 0;
-      __sync_add_and_fetch (&dm->ses_num, -1);
+      clib_atomic_add_fetch (&dm->ses_num, -1);
     }
 }