mbuf: use 2 bytes for port and nb segments

[dpdk.git] / lib / librte_mbuf / rte_mbuf.h

diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h
index 4ef27f9..323a1ac 100644 (file)
--- a/lib/librte_mbuf/rte_mbuf.h
+++ b/lib/librte_mbuf/rte_mbuf.h
@@ -400,12 +400,13 @@ struct rte_mbuf {
        void *buf_addr;           /**< Virtual address of segment buffer. */
        phys_addr_t buf_physaddr; /**< Physical address of segment buffer. */
 
-       /* next 6 bytes are initialised on RX descriptor rearm */
+       /* next 8 bytes are initialised on RX descriptor rearm */
        MARKER64 rearm_data;
        uint16_t data_off;
 
        /**
-        * 16-bit Reference counter.
+        * Reference counter. Its size should at least equal to the size
+        * of port field (16 bits), to support zero-copy broadcast.
         * It should only be accessed using the following functions:
         * rte_mbuf_refcnt_update(), rte_mbuf_refcnt_read(), and
         * rte_mbuf_refcnt_set(). The functionality of these functions (atomic,
@@ -417,9 +418,10 @@ struct rte_mbuf {
                rte_atomic16_t refcnt_atomic; /**< Atomically accessed refcnt */
                uint16_t refcnt;              /**< Non-atomically accessed refcnt */
        };
-       uint8_t nb_segs;          /**< Number of segments. */
-       uint8_t port;             /**< Input port. */
-       uint16_t pad;             /**< 2B pad for naturally aligned ol_flags */
+       uint16_t nb_segs;         /**< Number of segments. */
+
+       /** Input port (16 bits to support more than 256 virtual ports). */
+       uint16_t port;
 
        uint64_t ol_flags;        /**< Offload features. */