[PATCH v3 23/45] event/opdl: use rte stdatomic API

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

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

Signed-off-by: Tyler Retzlaff <roretzla@linux.microsoft.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/event/opdl/opdl_ring.c | 80 +++++++++++++++++++++---------------------
 1 file changed, 40 insertions(+), 40 deletions(-)

diff --git a/drivers/event/opdl/opdl_ring.c b/drivers/event/opdl/opdl_ring.c
index da5ea02..a86bfb8 100644
--- a/drivers/event/opdl/opdl_ring.c
+++ b/drivers/event/opdl/opdl_ring.c
@@ -47,12 +47,12 @@ struct shared_state {
 	/* Last known minimum sequence number of dependencies, used for multi
 	 * thread operation
 	 */
-	uint32_t available_seq;
+	RTE_ATOMIC(uint32_t) available_seq;
 	char _pad1[RTE_CACHE_LINE_SIZE * 3];
-	uint32_t head;  /* Head sequence number (for multi thread operation) */
+	RTE_ATOMIC(uint32_t) head;  /* Head sequence number (for multi thread operation) */
 	char _pad2[RTE_CACHE_LINE_SIZE * 3];
 	struct opdl_stage *stage;  /* back pointer */
-	uint32_t tail;  /* Tail sequence number */
+	RTE_ATOMIC(uint32_t) tail;  /* Tail sequence number */
 	char _pad3[RTE_CACHE_LINE_SIZE * 2];
 } __rte_cache_aligned;
 
@@ -150,10 +150,10 @@ struct opdl_ring {
 available(const struct opdl_stage *s)
 {
 	if (s->threadsafe == true) {
-		uint32_t n = __atomic_load_n(&s->shared.available_seq,
-				__ATOMIC_ACQUIRE) -
-				__atomic_load_n(&s->shared.head,
-				__ATOMIC_ACQUIRE);
+		uint32_t n = rte_atomic_load_explicit(&s->shared.available_seq,
+				rte_memory_order_acquire) -
+				rte_atomic_load_explicit(&s->shared.head,
+				rte_memory_order_acquire);
 
 		/* Return 0 if available_seq needs to be updated */
 		return (n <= s->num_slots) ? n : 0;
@@ -169,7 +169,7 @@ struct opdl_ring {
 {
 	uint32_t i;
 	uint32_t this_tail = s->shared.tail;
-	uint32_t min_seq = __atomic_load_n(&s->deps[0]->tail, __ATOMIC_ACQUIRE);
+	uint32_t min_seq = rte_atomic_load_explicit(&s->deps[0]->tail, rte_memory_order_acquire);
 	/* Input stage sequence numbers are greater than the sequence numbers of
 	 * its dependencies so an offset of t->num_slots is needed when
 	 * calculating available slots and also the condition which is used to
@@ -180,16 +180,16 @@ struct opdl_ring {
 	if (is_input_stage(s)) {
 		wrap = s->num_slots;
 		for (i = 1; i < s->num_deps; i++) {
-			uint32_t seq = __atomic_load_n(&s->deps[i]->tail,
-					__ATOMIC_ACQUIRE);
+			uint32_t seq = rte_atomic_load_explicit(&s->deps[i]->tail,
+					rte_memory_order_acquire);
 			if ((this_tail - seq) > (this_tail - min_seq))
 				min_seq = seq;
 		}
 	} else {
 		wrap = 0;
 		for (i = 1; i < s->num_deps; i++) {
-			uint32_t seq = __atomic_load_n(&s->deps[i]->tail,
-					__ATOMIC_ACQUIRE);
+			uint32_t seq = rte_atomic_load_explicit(&s->deps[i]->tail,
+					rte_memory_order_acquire);
 			if ((seq - this_tail) < (min_seq - this_tail))
 				min_seq = seq;
 		}
@@ -198,8 +198,8 @@ struct opdl_ring {
 	if (s->threadsafe == false)
 		s->available_seq = min_seq + wrap;
 	else
-		__atomic_store_n(&s->shared.available_seq, min_seq + wrap,
-				__ATOMIC_RELEASE);
+		rte_atomic_store_explicit(&s->shared.available_seq, min_seq + wrap,
+				rte_memory_order_release);
 }
 
 /* Wait until the number of available slots reaches number requested */
@@ -299,7 +299,7 @@ struct opdl_ring {
 	copy_entries_in(t, head, entries, num_entries);
 
 	s->head += num_entries;
-	__atomic_store_n(&s->shared.tail, s->head, __ATOMIC_RELEASE);
+	rte_atomic_store_explicit(&s->shared.tail, s->head, rte_memory_order_release);
 
 	return num_entries;
 }
@@ -382,18 +382,18 @@ struct opdl_ring {
 		/* There should be no race condition here. If shared.tail
 		 * matches, no other core can update it until this one does.
 		 */
-		if (__atomic_load_n(&s->shared.tail, __ATOMIC_ACQUIRE) ==
+		if (rte_atomic_load_explicit(&s->shared.tail, rte_memory_order_acquire) ==
 				tail) {
 			if (num_entries >= (head - tail)) {
 				claim_mgr_remove(disclaims);
-				__atomic_store_n(&s->shared.tail, head,
-						__ATOMIC_RELEASE);
+				rte_atomic_store_explicit(&s->shared.tail, head,
+						rte_memory_order_release);
 				num_entries -= (head - tail);
 			} else {
 				claim_mgr_move_tail(disclaims, num_entries);
-				__atomic_store_n(&s->shared.tail,
+				rte_atomic_store_explicit(&s->shared.tail,
 						num_entries + tail,
-						__ATOMIC_RELEASE);
+						rte_memory_order_release);
 				num_entries = 0;
 			}
 		} else if (block == false)
@@ -421,7 +421,7 @@ struct opdl_ring {
 	opdl_stage_disclaim_multithread_n(s, disclaims->num_to_disclaim,
 			false);
 
-	*old_head = __atomic_load_n(&s->shared.head, __ATOMIC_ACQUIRE);
+	*old_head = rte_atomic_load_explicit(&s->shared.head, rte_memory_order_acquire);
 	while (true) {
 		bool success;
 		/* If called by opdl_ring_input(), claim does not need to be
@@ -441,11 +441,10 @@ struct opdl_ring {
 		if (*num_entries == 0)
 			return;
 
-		success = __atomic_compare_exchange_n(&s->shared.head, old_head,
+		success = rte_atomic_compare_exchange_weak_explicit(&s->shared.head, old_head,
 				*old_head + *num_entries,
-				true,  /* may fail spuriously */
-				__ATOMIC_RELEASE,  /* memory order on success */
-				__ATOMIC_ACQUIRE);  /* memory order on fail */
+				rte_memory_order_release,  /* memory order on success */
+				rte_memory_order_acquire);  /* memory order on fail */
 		if (likely(success))
 			break;
 		rte_pause();
@@ -473,10 +472,11 @@ struct opdl_ring {
 	/* If another thread started inputting before this one, but hasn't
 	 * finished, we need to wait for it to complete to update the tail.
 	 */
-	rte_wait_until_equal_32(&s->shared.tail, old_head, __ATOMIC_ACQUIRE);
+	rte_wait_until_equal_32((uint32_t *)(uintptr_t)&s->shared.tail, old_head,
+	    rte_memory_order_acquire);
 
-	__atomic_store_n(&s->shared.tail, old_head + num_entries,
-			__ATOMIC_RELEASE);
+	rte_atomic_store_explicit(&s->shared.tail, old_head + num_entries,
+			rte_memory_order_release);
 
 	return num_entries;
 }
@@ -526,8 +526,8 @@ struct opdl_ring {
 		for (j = 0; j < num_entries; j++) {
 			ev = (struct rte_event *)get_slot(t, s->head+j);
 
-			event  = __atomic_load_n(&(ev->event),
-					__ATOMIC_ACQUIRE);
+			event  = rte_atomic_load_explicit((uint64_t __rte_atomic *)&ev->event,
+					rte_memory_order_acquire);
 
 			opa_id = OPDL_OPA_MASK & (event >> OPDL_OPA_OFFSET);
 			flow_id  = OPDL_FLOWID_MASK & event;
@@ -628,8 +628,8 @@ struct opdl_ring {
 				num_entries, s->head - old_tail);
 		num_entries = s->head - old_tail;
 	}
-	__atomic_store_n(&s->shared.tail, num_entries + old_tail,
-			__ATOMIC_RELEASE);
+	rte_atomic_store_explicit(&s->shared.tail, num_entries + old_tail,
+			rte_memory_order_release);
 }
 
 uint32_t
@@ -658,7 +658,7 @@ struct opdl_ring {
 	copy_entries_in(t, head, entries, num_entries);
 
 	s->head += num_entries;
-	__atomic_store_n(&s->shared.tail, s->head, __ATOMIC_RELEASE);
+	rte_atomic_store_explicit(&s->shared.tail, s->head, rte_memory_order_release);
 
 	return num_entries;
 
@@ -677,7 +677,7 @@ struct opdl_ring {
 	copy_entries_out(t, head, entries, num_entries);
 
 	s->head += num_entries;
-	__atomic_store_n(&s->shared.tail, s->head, __ATOMIC_RELEASE);
+	rte_atomic_store_explicit(&s->shared.tail, s->head, rte_memory_order_release);
 
 	return num_entries;
 }
@@ -756,7 +756,7 @@ struct opdl_ring {
 		return 0;
 	}
 	if (s->threadsafe == false) {
-		__atomic_store_n(&s->shared.tail, s->head, __ATOMIC_RELEASE);
+		rte_atomic_store_explicit(&s->shared.tail, s->head, rte_memory_order_release);
 		s->seq += s->num_claimed;
 		s->shadow_head = s->head;
 		s->num_claimed = 0;
@@ -1009,8 +1009,8 @@ struct opdl_ring *
 			ev_orig = (struct rte_event *)
 				get_slot(t, s->shadow_head+i);
 
-			event  = __atomic_load_n(&(ev_orig->event),
-					__ATOMIC_ACQUIRE);
+			event  = rte_atomic_load_explicit((uint64_t __rte_atomic *)&ev_orig->event,
+					rte_memory_order_acquire);
 
 			opa_id = OPDL_OPA_MASK & (event >> OPDL_OPA_OFFSET);
 			flow_id  = OPDL_FLOWID_MASK & event;
@@ -1027,9 +1027,9 @@ struct opdl_ring *
 
 				if ((event & OPDL_EVENT_MASK) !=
 						ev_temp) {
-					__atomic_store_n(&(ev_orig->event),
-							ev_update,
-							__ATOMIC_RELEASE);
+					rte_atomic_store_explicit(
+						(uint64_t __rte_atomic *)&ev_orig->event,
+						ev_update, rte_memory_order_release);
 					ev_updated = true;
 				}
 				if (ev_orig->u64 != ev->u64) {
-- 
1.8.3.1