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, 12 insertions, 12 deletions

diff --git a/src/plugins/ioam/analyse/ip6/node.c b/src/plugins/ioam/analyse/ip6/node.c
index 902fb9b09ce..7a8d71de93b 100644
--- a/src/plugins/ioam/analyse/ip6/node.c
+++ b/src/plugins/ioam/analyse/ip6/node.c
@@ -256,17 +256,17 @@ ip6_ioam_analyse_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
 		  data0 = ioam_analyse_get_data_from_flow_id (flow_id0);
 		  data1 = ioam_analyse_get_data_from_flow_id (flow_id1);
 
-		  while (__sync_lock_test_and_set (data0->writer_lock, 1))
+		  while (clib_atomic_test_and_set (data0->writer_lock))
 		    ;
 		  data0->pkt_counter++;
 		  data0->bytes_counter += p_len0;
-		  *(data0->writer_lock) = 0;
+		  clib_atomic_release (data0->writer_lock);
 
-		  while (__sync_lock_test_and_set (data1->writer_lock, 1))
+		  while (clib_atomic_test_and_set (data1->writer_lock))
 		    ;
 		  data1->pkt_counter++;
 		  data1->bytes_counter += p_len1;
-		  *(data1->writer_lock) = 0;
+		  clib_atomic_release (data1->writer_lock);
 		}
 	      else if (error0 == 0)
 		{
@@ -274,11 +274,11 @@ ip6_ioam_analyse_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
 		  pkts_failed++;
 
 		  data0 = ioam_analyse_get_data_from_flow_id (flow_id0);
-		  while (__sync_lock_test_and_set (data0->writer_lock, 1))
+		  while (clib_atomic_test_and_set (data0->writer_lock))
 		    ;
 		  data0->pkt_counter++;
 		  data0->bytes_counter += p_len0;
-		  *(data0->writer_lock) = 0;
+		  clib_atomic_release (data0->writer_lock);
 		}
 	      else if (error1 == 0)
 		{
@@ -286,11 +286,11 @@ ip6_ioam_analyse_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
 		  pkts_failed++;
 
 		  data1 = ioam_analyse_get_data_from_flow_id (flow_id1);
-		  while (__sync_lock_test_and_set (data1->writer_lock, 1))
+		  while (clib_atomic_test_and_set (data1->writer_lock))
 		    ;
 		  data1->pkt_counter++;
 		  data1->bytes_counter += p_len1;
-		  *(data1->writer_lock) = 0;
+		  clib_atomic_release (data1->writer_lock);
 		}
 	      else
 		pkts_failed += 2;
@@ -327,12 +327,12 @@ ip6_ioam_analyse_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
 		{
 		  pkts_analysed++;
 		  data0 = ioam_analyse_get_data_from_flow_id (flow_id0);
-		  while (__sync_lock_test_and_set (data0->writer_lock, 1))
+		  while (clib_atomic_test_and_set (data0->writer_lock))
 		    ;
 		  data0->pkt_counter++;
 		  data0->bytes_counter +=
 		    clib_net_to_host_u16 (ip60->payload_length);
-		  *(data0->writer_lock) = 0;
+		  clib_atomic_release (data0->writer_lock);
 		}
 	      else
 		pkts_failed++;
@@ -393,13 +393,13 @@ ip6_ioam_analyse_hbh_pot (u32 flow_id, ip6_hop_by_hop_option_t * opt0,
   pot_profile = pot_profile_get_active ();
   ret = pot_validate (pot_profile, cumulative, random);
 
-  while (__sync_lock_test_and_set (data->writer_lock, 1))
+  while (clib_atomic_test_and_set (data->writer_lock))
     ;
 
   (0 == ret) ? (data->pot_data.sfc_validated_count++) :
     (data->pot_data.sfc_invalidated_count++);
 
-  *(data->writer_lock) = 0;
+  clib_atomic_release (data->writer_lock);
   return 0;
 }