X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=lib%2Flibrte_ring%2Frte_ring_generic.h;h=953cdbbd5eb15303b46aefc1493f31bd90aaf85e;hb=c94366cfc641c6ae43d01c2ac4c6b8993817b356;hp=5b110425f38beea4f6699fcf5edbc01e72744932;hpb=9ffdaaa12210570b7d8b75e723a538ca8c778439;p=dpdk.git

diff --git a/lib/librte_ring/rte_ring_generic.h b/lib/librte_ring/rte_ring_generic.h
index 5b110425f3..953cdbbd5e 100644
--- a/lib/librte_ring/rte_ring_generic.h
+++ b/lib/librte_ring/rte_ring_generic.h
@@ -53,7 +53,7 @@ update_tail(struct rte_ring_headtail *ht, uint32_t old_val, uint32_t new_val,
  *   If behavior == RTE_RING_QUEUE_FIXED, this will be 0 or n only.
  */
 static __rte_always_inline unsigned int
-__rte_ring_move_prod_head(struct rte_ring *r, int is_sp,
+__rte_ring_move_prod_head(struct rte_ring *r, unsigned int is_sp,
 		unsigned int n, enum rte_ring_queue_behavior behavior,
 		uint32_t *old_head, uint32_t *new_head,
 		uint32_t *free_entries)
@@ -73,14 +73,13 @@ __rte_ring_move_prod_head(struct rte_ring *r, int is_sp,
 		 */
 		rte_smp_rmb();
 
-		const uint32_t cons_tail = r->cons.tail;
 		/*
 		 *  The subtraction is done between two unsigned 32bits value
 		 * (the result is always modulo 32 bits even if we have
 		 * *old_head > cons_tail). So 'free_entries' is always between 0
 		 * and capacity (which is < size).
 		 */
-		*free_entries = (capacity + cons_tail - *old_head);
+		*free_entries = (capacity + r->cons.tail - *old_head);
 
 		/* check that we have enough room in ring */
 		if (unlikely(n > *free_entries))
@@ -124,7 +123,7 @@ __rte_ring_move_prod_head(struct rte_ring *r, int is_sp,
  *     If behavior == RTE_RING_QUEUE_FIXED, this will be 0 or n only.
  */
 static __rte_always_inline unsigned int
-__rte_ring_move_cons_head(struct rte_ring *r, int is_sc,
+__rte_ring_move_cons_head(struct rte_ring *r, unsigned int is_sc,
 		unsigned int n, enum rte_ring_queue_behavior behavior,
 		uint32_t *old_head, uint32_t *new_head,
 		uint32_t *entries)
@@ -144,13 +143,12 @@ __rte_ring_move_cons_head(struct rte_ring *r, int is_sc,
 		 */
 		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
 		 * cons_head > prod_tail). So 'entries' is always between 0
 		 * and size(ring)-1.
 		 */
-		*entries = (prod_tail - *old_head);
+		*entries = (r->prod.tail - *old_head);
 
 		/* Set the actual entries for dequeue */
 		if (n > *entries)
@@ -160,11 +158,14 @@ __rte_ring_move_cons_head(struct rte_ring *r, int is_sc,
 			return 0;
 
 		*new_head = *old_head + n;
-		if (is_sc)
-			r->cons.head = *new_head, success = 1;
-		else
+		if (is_sc) {
+			r->cons.head = *new_head;
+			rte_smp_rmb();
+			success = 1;
+		} else {
 			success = rte_atomic32_cmpset(&r->cons.head, *old_head,
 					*new_head);
+		}
 	} while (unlikely(success == 0));
 	return n;
 }