[PATCH 09/21] mbuf: use rte optional stdatomic API

[Tyler Retzlaff <roretzla@linux.microsoft.com>]

Replace the use of gcc builtin __atomic_xxx intrinsics with
corresponding rte_atomic_xxx optional stdatomic API

Signed-off-by: Tyler Retzlaff <roretzla@linux.microsoft.com>
---
 lib/mbuf/rte_mbuf.h      | 20 ++++++++++----------
 lib/mbuf/rte_mbuf_core.h |  4 ++--
 2 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/lib/mbuf/rte_mbuf.h b/lib/mbuf/rte_mbuf.h
index 913c459..b8ab477 100644
--- a/lib/mbuf/rte_mbuf.h
+++ b/lib/mbuf/rte_mbuf.h
@@ -361,7 +361,7 @@ struct rte_pktmbuf_pool_private {
 static inline uint16_t
 rte_mbuf_refcnt_read(const struct rte_mbuf *m)
 {
-	return __atomic_load_n(&m->refcnt, __ATOMIC_RELAXED);
+	return rte_atomic_load_explicit(&m->refcnt, rte_memory_order_relaxed);
 }
 
 /**
@@ -374,15 +374,15 @@ struct rte_pktmbuf_pool_private {
 static inline void
 rte_mbuf_refcnt_set(struct rte_mbuf *m, uint16_t new_value)
 {
-	__atomic_store_n(&m->refcnt, new_value, __ATOMIC_RELAXED);
+	rte_atomic_store_explicit(&m->refcnt, new_value, rte_memory_order_relaxed);
 }
 
 /* internal */
 static inline uint16_t
 __rte_mbuf_refcnt_update(struct rte_mbuf *m, int16_t value)
 {
-	return __atomic_fetch_add(&m->refcnt, value,
-				 __ATOMIC_ACQ_REL) + value;
+	return rte_atomic_fetch_add_explicit(&m->refcnt, value,
+				 rte_memory_order_acq_rel) + value;
 }
 
 /**
@@ -463,7 +463,7 @@ struct rte_pktmbuf_pool_private {
 static inline uint16_t
 rte_mbuf_ext_refcnt_read(const struct rte_mbuf_ext_shared_info *shinfo)
 {
-	return __atomic_load_n(&shinfo->refcnt, __ATOMIC_RELAXED);
+	return rte_atomic_load_explicit(&shinfo->refcnt, rte_memory_order_relaxed);
 }
 
 /**
@@ -478,7 +478,7 @@ struct rte_pktmbuf_pool_private {
 rte_mbuf_ext_refcnt_set(struct rte_mbuf_ext_shared_info *shinfo,
 	uint16_t new_value)
 {
-	__atomic_store_n(&shinfo->refcnt, new_value, __ATOMIC_RELAXED);
+	rte_atomic_store_explicit(&shinfo->refcnt, new_value, rte_memory_order_relaxed);
 }
 
 /**
@@ -502,8 +502,8 @@ struct rte_pktmbuf_pool_private {
 		return (uint16_t)value;
 	}
 
-	return __atomic_fetch_add(&shinfo->refcnt, value,
-				 __ATOMIC_ACQ_REL) + value;
+	return rte_atomic_fetch_add_explicit(&shinfo->refcnt, value,
+				 rte_memory_order_acq_rel) + value;
 }
 
 /** Mbuf prefetch */
@@ -1315,8 +1315,8 @@ static inline int __rte_pktmbuf_pinned_extbuf_decref(struct rte_mbuf *m)
 	 * Direct usage of add primitive to avoid
 	 * duplication of comparing with one.
 	 */
-	if (likely(__atomic_fetch_add(&shinfo->refcnt, -1,
-				     __ATOMIC_ACQ_REL) - 1))
+	if (likely(rte_atomic_fetch_add_explicit(&shinfo->refcnt, -1,
+				     rte_memory_order_acq_rel) - 1))
 		return 1;
 
 	/* Reinitialize counter before mbuf freeing. */
diff --git a/lib/mbuf/rte_mbuf_core.h b/lib/mbuf/rte_mbuf_core.h
index e9bc0d1..bf761f8 100644
--- a/lib/mbuf/rte_mbuf_core.h
+++ b/lib/mbuf/rte_mbuf_core.h
@@ -497,7 +497,7 @@ struct rte_mbuf {
 	 * rte_mbuf_refcnt_set(). The functionality of these functions (atomic,
 	 * or non-atomic) is controlled by the RTE_MBUF_REFCNT_ATOMIC flag.
 	 */
-	uint16_t refcnt;
+	RTE_ATOMIC(uint16_t) refcnt;
 
 	/**
 	 * Number of segments. Only valid for the first segment of an mbuf
@@ -674,7 +674,7 @@ struct rte_mbuf {
 struct rte_mbuf_ext_shared_info {
 	rte_mbuf_extbuf_free_callback_t free_cb; /**< Free callback function */
 	void *fcb_opaque;                        /**< Free callback argument */
-	uint16_t refcnt;
+	RTE_ATOMIC(uint16_t) refcnt;
 };
 
 /** Maximum number of nb_segs allowed. */
-- 
1.8.3.1