mbuf: add flag for LRO

When receiving coalesced packets in virtio, the original size of the
segments is provided. This is a useful information because it allows to
resegment with the same size.

Add a RX new flag in mbuf, that can be set when packets are coalesced by
a hardware or virtual driver when the m->tso_segsz field is valid and is
set to the segment size of original packets.

This flag is used in next commits in the virtio pmd.

Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Reviewed-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>

diff --git a/doc/guides/rel_notes/release_16_11.rst b/doc/guides/rel_notes/release_16_11.rst
index ada852c..660c3fc 100644 (file)
--- a/doc/guides/rel_notes/release_16_11.rst
+++ b/doc/guides/rel_notes/release_16_11.rst
@@ -52,6 +52,8 @@ New Features
   * Added new Rx checksum flags in mbufs to describe more states: unknown,
     good, bad, or not present (useful for virtual drivers). This modification
     was done for IP and L4.
+  * Added a new RX LRO mbuf flag, used when packets are coalesced. This
+    flag indicates that the segment size of original packets is known.
 
 * **Added vhost-user dequeue zero copy support**
 

diff --git a/lib/librte_mbuf/rte_mbuf.c b/lib/librte_mbuf/rte_mbuf.c
index 8d9b875..63f43c8 100644 (file)
--- a/lib/librte_mbuf/rte_mbuf.c
+++ b/lib/librte_mbuf/rte_mbuf.c
@@ -319,6 +319,7 @@ const char *rte_get_rx_ol_flag_name(uint64_t mask)
        case PKT_RX_IEEE1588_PTP: return "PKT_RX_IEEE1588_PTP";
        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";
        default: return NULL;
        }
 }
@@ -352,6 +353,7 @@ rte_get_rx_ol_flag_list(uint64_t mask, char *buf, size_t buflen)
                { PKT_RX_IEEE1588_PTP, PKT_RX_IEEE1588_PTP, NULL },
                { 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 },
        };
        const char *name;
        unsigned int i;

diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h
index 38022a3..f5eedda 100644 (file)
--- a/lib/librte_mbuf/rte_mbuf.h
+++ b/lib/librte_mbuf/rte_mbuf.h
@@ -170,6 +170,13 @@ extern "C" {
  */
 #define PKT_RX_QINQ_PKT      PKT_RX_QINQ_STRIPPED
 
+/**
+ * When packets are coalesced by a hardware or virtual driver, this flag
+ * can be set in the RX mbuf, meaning that the m->tso_segsz field is
+ * valid and is set to the segment size of original packets.
+ */
+#define PKT_RX_LRO           (1ULL << 16)
+
 /* add new RX flags here */
 
 /* add new TX flags here */