[PATCH v3 2/4] ethdev: add Tx offload outer UDP checksum definition

[Jerin Jacob <jerin.jacob@caviumnetworks.com>]

Introduced DEV_TX_OFFLOAD_OUTER_UDP_CKSUM offload flags and
PKT_TX_OUTER_UDP_CKSUM mbuf ol_flags to enable Tx outer UDP
checksum offload.

To use hardware Tx outer UDP checksum offload, the user needs to,

- enable following in mbuf:
a) fill outer_l2_len and outer_l3_len in mbuf
b) set the PKT_TX_OUTER_UDP_CKSUM flag
c) set the flag PKT_TX_OUTER_IPV4 or PKT_TX_OUTER_IPV6

- configure DEV_TX_OFFLOAD_OUTER_UDP_CKSUM offload flags in slow path

Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
---

v3:

- Git comment corrections (Andrew Rybchenko)
s/PKT_TX_OUTER_TCP_CKSUM/PKT_TX_OUTER_UDP_CKSUM/g
s/mbuff/mbuf/g

v2:
- Removed DEV_TX_OFFLOAD_OUTER_TCP_CKSUM and DEV_TX_OFFLOAD_OUTER_SCTP_CKSUM
as there is no realworld use case for it.
See: http://patches.dpdk.org/patch/44692/

This patch series is depended on http://patches.dpdk.org/patch/45840/

---
 app/test-pmd/config.c          | 10 ++++++++++
 doc/guides/nics/features.rst   |  5 +++++
 lib/librte_ethdev/rte_ethdev.c |  1 +
 lib/librte_ethdev/rte_ethdev.h |  2 ++
 lib/librte_mbuf/rte_mbuf.c     |  1 +
 lib/librte_mbuf/rte_mbuf.h     |  6 +++++-
 6 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
index d53c527e5..5d9745ae5 100644
--- a/app/test-pmd/config.c
+++ b/app/test-pmd/config.c
@@ -773,6 +773,16 @@ port_offload_cap_display(portid_t port_id)
 		else
 			printf("off\n");
 	}
+
+	if (dev_info.tx_offload_capa & DEV_TX_OFFLOAD_OUTER_UDP_CKSUM) {
+		printf("TX Outer UDP checksum:               ");
+		if (ports[port_id].dev_conf.txmode.offloads &
+		    DEV_TX_OFFLOAD_OUTER_UDP_CKSUM)
+			printf("on\n");
+		else
+			printf("off\n");
+	}
+
 }
 
 int
diff --git a/doc/guides/nics/features.rst b/doc/guides/nics/features.rst
index 266c9f14b..1390e9668 100644
--- a/doc/guides/nics/features.rst
+++ b/doc/guides/nics/features.rst
@@ -640,8 +640,13 @@ Inner L4 checksum
 Supports inner packet L4 checksum.
 
 * **[uses]     rte_eth_rxconf,rte_eth_rxmode**: ``offloads:DEV_RX_OFFLOAD_OUTER_UDP_CKSUM``.
+* **[uses]     rte_eth_txconf,rte_eth_txmode**: ``offloads:DEV_TX_OFFLOAD_OUTER_UDP_CKSUM``.
+* **[uses]     mbuf**: ``mbuf.ol_flags:PKT_TX_OUTER_IPV4`` | ``PKT_TX_OUTER_IPV6``.
+  ``mbuf.ol_flags:PKT_TX_OUTER_UDP_CKSUM``.
+* **[uses]     mbuf**: ``mbuf.outer_l2_len``, ``mbuf.outer_l3_len``.
 * **[provides] mbuf**: ``mbuf.ol_flags:PKT_RX_EL4_CKSUM_BAD``.
 * **[provides] rte_eth_dev_info**: ``rx_offload_capa,rx_queue_offload_capa:DEV_RX_OFFLOAD_OUTER_UDP_CKSUM``,
+  ``tx_offload_capa,tx_queue_offload_capa:DEV_TX_OFFLOAD_OUTER_UDP_CKSUM``.
 
 
 .. _nic_features_packet_type_parsing:
diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
index a630c4fda..bb48b5a0f 100644
--- a/lib/librte_ethdev/rte_ethdev.c
+++ b/lib/librte_ethdev/rte_ethdev.c
@@ -159,6 +159,7 @@ static const struct {
 	RTE_TX_OFFLOAD_BIT2STR(SECURITY),
 	RTE_TX_OFFLOAD_BIT2STR(UDP_TNL_TSO),
 	RTE_TX_OFFLOAD_BIT2STR(IP_TNL_TSO),
+	RTE_TX_OFFLOAD_BIT2STR(OUTER_UDP_CKSUM),
 };
 
 #undef RTE_TX_OFFLOAD_BIT2STR
diff --git a/lib/librte_ethdev/rte_ethdev.h b/lib/librte_ethdev/rte_ethdev.h
index 821d371c3..79d0bb1ed 100644
--- a/lib/librte_ethdev/rte_ethdev.h
+++ b/lib/librte_ethdev/rte_ethdev.h
@@ -944,6 +944,8 @@ struct rte_eth_conf {
  * for tunnel TSO.
  */
 #define DEV_TX_OFFLOAD_IP_TNL_TSO       0x00080000
+/** Device supports outer UDP checksum */
+#define DEV_TX_OFFLOAD_OUTER_UDP_CKSUM  0x00100000
 
 #define RTE_ETH_DEV_CAPA_RUNTIME_RX_QUEUE_SETUP 0x00000001
 /**< Device supports Rx queue setup after device started*/
diff --git a/lib/librte_mbuf/rte_mbuf.c b/lib/librte_mbuf/rte_mbuf.c
index 022e92b3c..9db4317ef 100644
--- a/lib/librte_mbuf/rte_mbuf.c
+++ b/lib/librte_mbuf/rte_mbuf.c
@@ -437,6 +437,7 @@ rte_get_tx_ol_flag_list(uint64_t mask, char *buf, size_t buflen)
 		  "PKT_TX_TUNNEL_NONE" },
 		{ PKT_TX_MACSEC, PKT_TX_MACSEC, NULL },
 		{ PKT_TX_SEC_OFFLOAD, PKT_TX_SEC_OFFLOAD, NULL },
+		{ PKT_TX_OUTER_UDP_CKSUM, PKT_TX_OUTER_UDP_CKSUM, NULL },
 	};
 	const char *name;
 	unsigned int i;
diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h
index 5c03e98b3..0a2de50ca 100644
--- a/lib/librte_mbuf/rte_mbuf.h
+++ b/lib/librte_mbuf/rte_mbuf.h
@@ -184,6 +184,9 @@ extern "C" {
 
 /* add new TX flags here */
 
+/**< Outer UDP cksum of TX pkt. computed by NIC. */
+#define PKT_TX_OUTER_UDP_CKSUM     (1ULL << 41)
+
 /**
  * UDP Fragmentation Offload flag. This flag is used for enabling UDP
  * fragmentation in SW or in HW. When use UFO, mbuf->tso_segsz is used
@@ -351,7 +354,8 @@ extern "C" {
 		PKT_TX_TUNNEL_MASK |	 \
 		PKT_TX_MACSEC |		 \
 		PKT_TX_SEC_OFFLOAD |	\
-		PKT_TX_UDP_SEG)
+		PKT_TX_UDP_SEG |	\
+		PKT_TX_OUTER_UDP_CKSUM)
 
 /**
  * Mbuf having an external buffer attached. shinfo in mbuf must be filled.
-- 
2.19.0