[dpdk-dev] [RFC 1/4] ring: future proof flag settings

[Stephen Hemminger <stephen@networkplumber.org>]

All API's should check that they support the flag values
passed. If an application passes an invalid flag it could
cause problems in later ABI.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 lib/librte_ring/rte_ring.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/librte_ring/rte_ring.c b/lib/librte_ring/rte_ring.c
index 77e5de099b81..6cd8831649ea 100644
--- a/lib/librte_ring/rte_ring.c
+++ b/lib/librte_ring/rte_ring.c
@@ -100,6 +100,13 @@ rte_ring_init(struct rte_ring *r, const char *name, unsigned count,
 	RTE_BUILD_BUG_ON((offsetof(struct rte_ring, prod) &
 			  RTE_CACHE_LINE_MASK) != 0);
 
+	/* future proof flags, only allow supported values */
+	if (flags & ~(RING_F_SP_ENQ | RING_F_SC_DEQ)) {
+		RTE_LOG(ERR, RING,
+			"Unsupported flags requested %d\n", flags);
+		return -EINVAL;
+	}
+		
 	/* init the ring structure */
 	memset(r, 0, sizeof(*r));
 	ret = strlcpy(r->name, name, sizeof(r->name));
-- 
2.20.1