[PATCH v3 1/5] mbuf: clarify meta data needed for Outbound Inline

[Nithin Dabilpuram <ndabilpuram@marvell.com>]

Clarify mbuf meta data needed for Outbound Inline processing.
Application needs to provide mbuf.l3_len and L3 type in
mbuf.ol_flags so that like tunnel mode using mbuf.l2_len, transport mode
can make use of l3_len and l3_type to determine perform
proper transport mode IPsec processing.

Signed-off-by: Nithin Dabilpuram <ndabilpuram@marvell.com>
---
v3:
- Addressed comments on patch 4/5 and added acks.
v2:
- Modified ipsec-secgw to do ether type update for outbound path.

 doc/guides/nics/features.rst | 2 +-
 lib/mbuf/rte_mbuf_core.h     | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/doc/guides/nics/features.rst b/doc/guides/nics/features.rst
index 7f6cb91..b4a8e98 100644
--- a/doc/guides/nics/features.rst
+++ b/doc/guides/nics/features.rst
@@ -431,7 +431,7 @@ protocol operations. See security library and PMD documentation for more details
 
 * **[uses]       rte_eth_rxconf,rte_eth_rxmode**: ``offloads:RTE_ETH_RX_OFFLOAD_SECURITY``,
 * **[uses]       rte_eth_txconf,rte_eth_txmode**: ``offloads:RTE_ETH_TX_OFFLOAD_SECURITY``.
-* **[uses]       mbuf**: ``mbuf.l2_len``.
+* **[uses]       mbuf**: ``mbuf.l2_len``, ``mbuf.l3_len``, ``mbuf.ol_flags``.
 * **[implements] rte_security_ops**: ``session_create``, ``session_update``,
   ``session_stats_get``, ``session_destroy``, ``set_pkt_metadata``, ``get_userdata``,
   ``capabilities_get``.
diff --git a/lib/mbuf/rte_mbuf_core.h b/lib/mbuf/rte_mbuf_core.h
index 3d6ddd6..b62a7c6 100644
--- a/lib/mbuf/rte_mbuf_core.h
+++ b/lib/mbuf/rte_mbuf_core.h
@@ -267,7 +267,8 @@ extern "C" {
 /**
  * Request security offload processing on the TX packet.
  * To use Tx security offload, the user needs to fill l2_len in mbuf
- * indicating L2 header size and where L3 header starts.
+ * indicating L2 header size and where L3 header starts. Similarly,
+ * l3_len should also be filled along with ol_flags reflecting current L3 type.
  */
 #define RTE_MBUF_F_TX_SEC_OFFLOAD	(1ULL << 43)
 #define PKT_TX_SEC_OFFLOAD RTE_DEPRECATED(PKT_TX_SEC_OFFLOAD) \
-- 
2.8.4