mbuf: introduce a flag to indicate a control mbuf

Since the flags field is now 64-bits, we can allow one bit to be used to
indicate a control i.e. non-packet mbuf. Dedicate the high bit (bit 63)
for this purpose and add in a utility macro to test if a given mbuf has
the bit set or not.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Olivier Matz <olivier.matz@6wind.com>

diff --git a/lib/librte_mbuf/rte_mbuf.c b/lib/librte_mbuf/rte_mbuf.c
index 9dfcac3..52e7574 100644 (file)
--- a/lib/librte_mbuf/rte_mbuf.c
+++ b/lib/librte_mbuf/rte_mbuf.c
@@ -69,7 +69,9 @@ rte_ctrlmbuf_init(struct rte_mempool *mp,
                void *_m,
                __attribute__((unused)) unsigned i)
 {
+       struct rte_mbuf *m = _m;
        rte_pktmbuf_init(mp, opaque_arg, _m, i);
+       m->ol_flags |= CTRL_MBUF_FLAG;
 }
 
 /*

diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h
index 0e20e31..b9a1c66 100644 (file)
--- a/lib/librte_mbuf/rte_mbuf.h
+++ b/lib/librte_mbuf/rte_mbuf.h
@@ -91,6 +91,7 @@ extern "C" {
 #define PKT_TX_IPV4_CSUM     0x1000 /**< Alias of PKT_TX_IP_CKSUM. */
 #define PKT_TX_IPV4          PKT_RX_IPV4_HDR /**< IPv4 with no IP checksum offload. */
 #define PKT_TX_IPV6          PKT_RX_IPV6_HDR /**< IPv6 packet */
+
 /*
  * Bit 14~13 used for L4 packet type with checksum enabled.
  *     00: Reserved
@@ -106,6 +107,9 @@ extern "C" {
 /* Bit 15 */
 #define PKT_TX_IEEE1588_TMST 0x8000 /**< TX IEEE1588 packet to timestamp. */
 
+/* Use final bit of flags to indicate a control mbuf */
+#define CTRL_MBUF_FLAG       (1ULL << 63)
+
 /**
  * Bit Mask to indicate what bits required for building TX context
  */
@@ -471,6 +475,21 @@ void rte_ctrlmbuf_init(struct rte_mempool *mp, void *opaque_arg,
  */
 #define rte_ctrlmbuf_len(m) rte_pktmbuf_data_len(m)
 
+/**
+ * Tests if an mbuf is a control mbuf
+ *
+ * @param m
+ *   The mbuf to be tested
+ * @return
+ *   - True (1) if the mbuf is a control mbuf
+ *   - False(0) otherwise
+ */
+static inline int
+rte_is_ctrlmbuf(struct rte_mbuf *m)
+{
+       return (!!(m->ol_flags & CTRL_MBUF_FLAG));
+}
+
 /* Operations on pkt mbuf */
 
 /**