[PATCH v3 2/5] mbuf: add second dynamic field member for VA only build

[Shijith Thotton <sthotton@marvell.com>]

mbuf physical address field is not used in builds which only uses VA. It
is used to expand the dynamic field area.

Signed-off-by: Shijith Thotton <sthotton@marvell.com>
---
 lib/mbuf/rte_mbuf_core.h | 26 +++++++++++++++++---------
 lib/mbuf/rte_mbuf_dyn.c  |  2 ++
 2 files changed, 19 insertions(+), 9 deletions(-)

diff --git a/lib/mbuf/rte_mbuf_core.h b/lib/mbuf/rte_mbuf_core.h
index c6292e7252..94907f301d 100644
--- a/lib/mbuf/rte_mbuf_core.h
+++ b/lib/mbuf/rte_mbuf_core.h
@@ -579,15 +579,23 @@ struct rte_mbuf {
 	RTE_MARKER cacheline0;
 
 	void *buf_addr;           /**< Virtual address of segment buffer. */
-	/**
-	 * Physical address of segment buffer.
-	 * This field is invalid if the build is configured to use only
-	 * virtual address as IOVA (i.e. RTE_IOVA_AS_VA is 1).
-	 * Force alignment to 8-bytes, so as to ensure we have the exact
-	 * same mbuf cacheline0 layout for 32-bit and 64-bit. This makes
-	 * working on vector drivers easier.
-	 */
-	rte_iova_t buf_iova __rte_aligned(sizeof(rte_iova_t));
+	RTE_STD_C11
+	union {
+		/**
+		 * Physical address of segment buffer.
+		 * This field is invalid if the build is configured to use only
+		 * virtual address as IOVA (i.e. RTE_IOVA_AS_VA is 1).
+		 * Force alignment to 8-bytes, so as to ensure we have the exact
+		 * same mbuf cacheline0 layout for 32-bit and 64-bit. This makes
+		 * working on vector drivers easier.
+		 */
+		rte_iova_t buf_iova __rte_aligned(sizeof(rte_iova_t));
+		/**
+		 * Reserved for dynamic field in builds where physical address
+		 * field is invalid.
+		 */
+		uint64_t dynfield2;
+	};
 
 	/* next 8 bytes are initialised on RX descriptor rearm */
 	RTE_MARKER64 rearm_data;
diff --git a/lib/mbuf/rte_mbuf_dyn.c b/lib/mbuf/rte_mbuf_dyn.c
index 4ae79383b5..6a4cf96897 100644
--- a/lib/mbuf/rte_mbuf_dyn.c
+++ b/lib/mbuf/rte_mbuf_dyn.c
@@ -128,6 +128,8 @@ init_shared_mem(void)
 		 */
 		memset(shm, 0, sizeof(*shm));
 		mark_free(dynfield1);
+		if (RTE_IOVA_AS_VA)
+			mark_free(dynfield2);
 
 		/* init free_flags */
 		for (mask = RTE_MBUF_F_FIRST_FREE; mask <= RTE_MBUF_F_LAST_FREE; mask <<= 1)
-- 
2.25.1