summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--lib/librte_ring/rte_ring.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/lib/librte_ring/rte_ring.h b/lib/librte_ring/rte_ring.h
index 5e9b3b7..e924438 100644
--- a/lib/librte_ring/rte_ring.h
+++ b/lib/librte_ring/rte_ring.h
@@ -409,6 +409,12 @@ __rte_ring_move_prod_head(struct rte_ring *r, int is_sp,
n = max;
*old_head = r->prod.head;
+
+ /* add rmb barrier to avoid load/load reorder in weak
+ * memory model. It is noop on x86
+ */
+ rte_smp_rmb();
+
const uint32_t cons_tail = r->cons.tail;
/*
* The subtraction is done between two unsigned 32bits value
@@ -517,6 +523,12 @@ __rte_ring_move_cons_head(struct rte_ring *r, int is_sc,
n = max;
*old_head = r->cons.head;
+
+ /* add rmb barrier to avoid load/load reorder in weak
+ * memory model. It is noop on x86
+ */
+ rte_smp_rmb();
+
const uint32_t prod_tail = r->prod.tail;
/* The subtraction is done between two unsigned 32bits value
* (the result is always modulo 32 bits even if we have