mbuf: enforce semantics for Tx inline IPsec processing

Not all net PMD's/HW can parse packet and identify L2 header and
L3 header locations on Tx. This is inline with other Tx offloads
requirements such as L3 checksum, L4 checksum offload, etc,
where mbuf.l2_len, mbuf.l3_len etc, needs to be set for HW to be
able to generate checksum. Since Inline IPsec is also such a Tx
offload, some PMD's at least need mbuf.l2_len to be valid to
find L3 header and perform Outbound IPSec processing.

Hence, this patch updates documentation to enforce setting
mbuf.l2_len while setting PKT_TX_SEC_OFFLOAD in mbuf.ol_flags
for Inline IPsec Crypto / Protocol offload processing to
work on Tx.

Signed-off-by: Nithin Dabilpuram <ndabilpuram@marvell.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
Acked-by: Akhil Goyal <gakhil@marvell.com>

diff --git a/doc/guides/nics/features.rst b/doc/guides/nics/features.rst
index a96e12d15515732d2829e8670375023f75f67848..4fce8cd1c976eb171c0e777758f9c2261ffc29f2 100644 (file)
--- a/doc/guides/nics/features.rst
+++ b/doc/guides/nics/features.rst
@@ -430,6 +430,7 @@ of protocol operations. See Security library and PMD documentation for more deta
 
 * **[uses]       rte_eth_rxconf,rte_eth_rxmode**: ``offloads:DEV_RX_OFFLOAD_SECURITY``,
 * **[uses]       rte_eth_txconf,rte_eth_txmode**: ``offloads:DEV_TX_OFFLOAD_SECURITY``.
+* **[uses]       mbuf**: ``mbuf.l2_len``.
 * **[implements] rte_security_ops**: ``session_create``, ``session_update``,
   ``session_stats_get``, ``session_destroy``, ``set_pkt_metadata``, ``capabilities_get``.
 * **[provides] rte_eth_dev_info**: ``rx_offload_capa,rx_queue_offload_capa:DEV_RX_OFFLOAD_SECURITY``,
@@ -451,6 +452,7 @@ protocol operations. See security library and PMD documentation for more details
 
 * **[uses]       rte_eth_rxconf,rte_eth_rxmode**: ``offloads:DEV_RX_OFFLOAD_SECURITY``,
 * **[uses]       rte_eth_txconf,rte_eth_txmode**: ``offloads:DEV_TX_OFFLOAD_SECURITY``.
+* **[uses]       mbuf**: ``mbuf.l2_len``.
 * **[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 bb38d7f581021861a5b976782d47d24b3d491383..9d8e3ddc860d4513ee9b6b055df299ab7fe6c977 100644 (file)
--- a/lib/mbuf/rte_mbuf_core.h
+++ b/lib/mbuf/rte_mbuf_core.h
@@ -228,6 +228,8 @@ 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.
  */
 #define PKT_TX_SEC_OFFLOAD     (1ULL << 43)