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 at 6wind.com>
---
doc/guides/rel_notes/release_16_11.rst | 5 +++++
lib/librte_mbuf/rte_mbuf.c | 2 ++
lib/librte_mbuf/rte_mbuf.h | 7 +++++++
3 files changed, 14 insertions(+)
diff --git a/doc/guides/rel_notes/release_16_11.rst
b/doc/guides/rel_notes/release_16_11.rst
index 2aff84c..a8ad9ab 100644
--- a/doc/guides/rel_notes/release_16_11.rst
+++ b/doc/guides/rel_notes/release_16_11.rst
@@ -66,6 +66,11 @@ New Features
good, bad, or not present (useful for virtual drivers). This modification
was done for IP and L4.
+* **Added a LRO mbuf flag.**
+
+ Added a new RX LRO mbuf flag, used when packets are coalesced. This
+ flag indicates that the segment size of original packets is known.
+
Resolved Issues
---------------
diff --git a/lib/librte_mbuf/rte_mbuf.c b/lib/librte_mbuf/rte_mbuf.c
index c55cb57..61bcd7e 100644
--- a/lib/librte_mbuf/rte_mbuf.c
+++ b/lib/librte_mbuf/rte_mbuf.c
@@ -317,6 +317,7 @@ 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;
}
}
@@ -349,6 +350,7 @@ int 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 7061cfc..f9d7bfa 100644
--- 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 */
--
2.8.1
