[dpdk-dev] [PATCH 2/4] rte_ring: store memzone pointer inside ring

[Bruce Richardson <bruce.richardson@intel.com>]

Add a new field to the rte_ring structure to store the memzone pointer which
contains the ring. For rings created using rte_ring_create(), the field will
be set automatically.

This new field will allow users of the ring to query the numa node a ring is
allocated on, or to get the physical address of the ring, if so needed.

The rte_ring structure will also maintain ABI compatibility, as the
structure members, after the new one, are set to be cache line aligned,
so leaving a space.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 lib/librte_ring/rte_ring.c | 1 +
 lib/librte_ring/rte_ring.h | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/lib/librte_ring/rte_ring.c b/lib/librte_ring/rte_ring.c
index c9e59d4..4e78e14 100644
--- a/lib/librte_ring/rte_ring.c
+++ b/lib/librte_ring/rte_ring.c
@@ -196,6 +196,7 @@ rte_ring_create(const char *name, unsigned count, int socket_id,
 		rte_ring_init(r, name, count, flags);
 
 		te->data = (void *) r;
+		r->memzone = mz;
 
 		TAILQ_INSERT_TAIL(ring_list, te, next);
 	} else {
diff --git a/lib/librte_ring/rte_ring.h b/lib/librte_ring/rte_ring.h
index af68888..df45f3f 100644
--- a/lib/librte_ring/rte_ring.h
+++ b/lib/librte_ring/rte_ring.h
@@ -134,6 +134,8 @@ struct rte_ring_debug_stats {
                                     *   if RTE_RING_PAUSE_REP not defined. */
 #endif
 
+struct rte_memzone; /* forward declaration, so as not to require memzone.h */
+
 /**
  * An RTE ring structure.
  *
@@ -147,6 +149,8 @@ struct rte_ring_debug_stats {
 struct rte_ring {
 	char name[RTE_RING_NAMESIZE];    /**< Name of the ring. */
 	int flags;                       /**< Flags supplied at creation. */
+	const struct rte_memzone *memzone;
+			/**< Memzone, if any, containing the rte_ring */
 
 	/** Ring producer status. */
 	struct prod {
-- 
2.4.3