[dpdk-dev] [RFC 8/8] mbuf: add a timestamp field

[Olivier Matz]

The field itself is not fully described yet, but this commit reserves
the room in the mbuf.

Signed-off-by: Olivier Matz <olivier.m...@6wind.com>
---
 lib/librte_mbuf/rte_mbuf.c |  2 ++
 lib/librte_mbuf/rte_mbuf.h | 10 ++++++++++
 2 files changed, 12 insertions(+)

diff --git a/lib/librte_mbuf/rte_mbuf.c b/lib/librte_mbuf/rte_mbuf.c
index 0acc810..f679bce 100644
--- a/lib/librte_mbuf/rte_mbuf.c
+++ b/lib/librte_mbuf/rte_mbuf.c
@@ -322,6 +322,7 @@ const char *rte_get_rx_ol_flag_name(uint64_t mask)
        case PKT_RX_IEEE1588_TMST: return "PKT_RX_IEEE1588_TMST";
        case PKT_RX_QINQ_STRIPPED: return "PKT_RX_QINQ_STRIPPED";
        case PKT_RX_LRO: return "PKT_RX_LRO";
+       case PKT_RX_TIMESTAMP: return "PKT_RX_TIMESTAMP";
        default: return NULL;
        }
 }
@@ -356,6 +357,7 @@ rte_get_rx_ol_flag_list(uint64_t mask, char *buf, size_t 
buflen)
                { PKT_RX_IEEE1588_TMST, PKT_RX_IEEE1588_TMST, NULL },
                { PKT_RX_QINQ_STRIPPED, PKT_RX_QINQ_STRIPPED, NULL },
                { PKT_RX_LRO, PKT_RX_LRO, NULL },
+               { PKT_RX_TIMESTAMP, PKT_RX_TIMESTAMP, NULL },
        };
        const char *name;
        unsigned int i;
diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h
index 39df3e1..4818e2f 100644
--- a/lib/librte_mbuf/rte_mbuf.h
+++ b/lib/librte_mbuf/rte_mbuf.h
@@ -177,6 +177,11 @@ extern "C" {
  */
 #define PKT_RX_LRO           (1ULL << 16)
 
+/**
+ * Indicate that the timestamp field in the mbuf is valid.
+ */
+#define PKT_RX_TIMESTAMP     (1ULL << 17)
+
 /* add new RX flags here */
 
 /* add new TX flags here */
@@ -469,6 +474,10 @@ struct rte_mbuf {
        uint16_t vlan_tci_outer;
 
        uint16_t buf_len;         /**< Length of segment buffer. */
+
+       /** Valid if PKT_RX_TIMESTAMP is set. The unit is nanoseconds */
+       uint64_t timestamp;
+
        /* second cache line - fields only used in slow path or on TX */
        MARKER cacheline1 __rte_cache_min_aligned;
 
@@ -1197,6 +1206,7 @@ static inline void rte_pktmbuf_attach(struct rte_mbuf 
*mi, struct rte_mbuf *m)
        mi->nb_segs = 1;
        mi->ol_flags = m->ol_flags | IND_ATTACHED_MBUF;
        mi->packet_type = m->packet_type;
+       mi->timestamp = m->timestamp;
 
        __rte_mbuf_sanity_check(mi, 1);
        __rte_mbuf_sanity_check(m, 0);
-- 
2.8.1