[PATCH 4/4] ethdev: add Tx offload outer L4 checksum definitions

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

Introduced DEV_TX_OFFLOAD_OUTER_UDP_CKSUM, DEV_TX_OFFLOAD_OUTER_TCP_CKSUM
and DEV_TX_OFFLOAD_OUTER_SCTP_CKSUM offload flags and

PKT_TX_OUTER_L4_NO_CKSUM, PKT_TX_OUTER_TCP_CKSUM, PKT_TX_OUTER_SCTP_CKSUM
and PKT_TX_OUTER_UDP_CKSUM mbuf ol_flags to enable Tx outer L4 checksum
offload.

To use hardware Tx outer L4 checksum offload, the user needs to.
# enable following in mbuff:
- fill outer_l2_len and outer_l3_len in mbuf
- set the flags PKT_TX_OUTER_TCP_CKSUM, PKT_TX_OUTER_SCTP_CKSUM or
PKT_TX_OUTER_UDP_CKSUM
- set the flag PKT_TX_OUTER_IPV4 or PKT_TX_OUTER_IPV6

# configure DEV_TX_OFFLOAD_OUTER_* offload flags in slow path.

Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
---
 app/test-pmd/config.c          | 27 +++++++++++++++++++++++++++
 doc/guides/nics/features.rst   |  6 ++++++
 lib/librte_ethdev/rte_ethdev.c |  3 +++
 lib/librte_ethdev/rte_ethdev.h |  6 ++++++
 lib/librte_mbuf/rte_mbuf.c     |  5 +++++
 lib/librte_mbuf/rte_mbuf.h     | 23 ++++++++++++++++++++++-
 6 files changed, 69 insertions(+), 1 deletion(-)

diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
index 92a177e29..85f832bf0 100644
--- a/app/test-pmd/config.c
+++ b/app/test-pmd/config.c
@@ -773,6 +773,33 @@ 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");
+	}
+
+	if (dev_info.tx_offload_capa & DEV_TX_OFFLOAD_OUTER_TCP_CKSUM) {
+		printf("TX Outer TCP checksum:               ");
+		if (ports[port_id].dev_conf.txmode.offloads &
+		    DEV_TX_OFFLOAD_OUTER_TCP_CKSUM)
+			printf("on\n");
+		else
+			printf("off\n");
+	}
+
+	if (dev_info.tx_offload_capa & DEV_TX_OFFLOAD_OUTER_SCTP_CKSUM) {
+		printf("TX Outer SCTP checksum:               ");
+		if (ports[port_id].dev_conf.txmode.offloads &
+		    DEV_TX_OFFLOAD_OUTER_SCTP_CKSUM)
+			printf("on\n");
+		else
+			printf("off\n");
+	}
 }
 
 int
diff --git a/doc/guides/nics/features.rst b/doc/guides/nics/features.rst
index 68420d196..884dbd7a5 100644
--- a/doc/guides/nics/features.rst
+++ b/doc/guides/nics/features.rst
@@ -639,8 +639,14 @@ Inner L4 checksum
 Supports inner packet L4 checksum.
 
 * **[uses]     rte_eth_rxconf,rte_eth_rxmode**: ``offloads:DEV_RX_OFFLOAD_OUTER_UDP_CKSUM,DEV_RX_OFFLOAD_OUTER_TCP_CKSUM,DEV_RX_OFFLOAD_OUTER_SCTP_CKSUM``.
+* **[uses]     rte_eth_txconf,rte_eth_txmode**: ``offloads:DEV_TX_OFFLOAD_OUTER_UDP_CKSUM,DEV_TX_OFFLOAD_OUTER_TCP_CKSUM,DEV_TX_OFFLOAD_OUTER_SCTP_CKSUM``.
+* **[uses]     mbuf**: ``mbuf.ol_flags:PKT_TX_OUTER_IPV4`` | ``PKT_TX_OUTER_IPV6``.
+  ``mbuf.ol_flags:PKT_TX_OUTER_L4_NO_CKSUM`` | ``PKT_TX_OUTER_TCP_CKSUM`` |
+  ``PKT_TX_OUTER_SCTP_CKSUM`` | ``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,DEV_RX_OFFLOAD_OUTER_TCP_CKSUM,DEV_RX_OFFLOAD_OUTER_SCTP_CKSUM``,
+  ``tx_offload_capa,tx_queue_offload_capa:DEV_TX_OFFLOAD_OUTER_UDP_CKSUM,DEV_TX_OFFLOAD_OUTER_TCP_CKSUM,DEV_TX_OFFLOAD_OUTER_SCTP_CKSUM``.
 
 .. _nic_features_packet_type_parsing:
 
diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
index 547132a8c..6cc5ad055 100644
--- a/lib/librte_ethdev/rte_ethdev.c
+++ b/lib/librte_ethdev/rte_ethdev.c
@@ -160,6 +160,9 @@ static const struct {
 	RTE_TX_OFFLOAD_BIT2STR(MULTI_SEGS),
 	RTE_TX_OFFLOAD_BIT2STR(MBUF_FAST_FREE),
 	RTE_TX_OFFLOAD_BIT2STR(SECURITY),
+	RTE_TX_OFFLOAD_BIT2STR(OUTER_UDP_CKSUM),
+	RTE_TX_OFFLOAD_BIT2STR(OUTER_TCP_CKSUM),
+	RTE_TX_OFFLOAD_BIT2STR(OUTER_SCTP_CKSUM),
 };
 
 #undef RTE_TX_OFFLOAD_BIT2STR
diff --git a/lib/librte_ethdev/rte_ethdev.h b/lib/librte_ethdev/rte_ethdev.h
index 4665bd6f7..a5b33a27f 100644
--- a/lib/librte_ethdev/rte_ethdev.h
+++ b/lib/librte_ethdev/rte_ethdev.h
@@ -963,6 +963,12 @@ 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
+/** Device supports outer TCP checksum */
+#define DEV_TX_OFFLOAD_OUTER_TCP_CKSUM  0x00200000
+/** Device supports outer SCTP checksum */
+#define DEV_TX_OFFLOAD_OUTER_SCTP_CKSUM 0x00400000
 
 #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..af14d9273 100644
--- a/lib/librte_mbuf/rte_mbuf.c
+++ b/lib/librte_mbuf/rte_mbuf.c
@@ -437,6 +437,11 @@ 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_TCP_CKSUM, PKT_TX_OUTER_L4_MASK, NULL },
+		{ PKT_TX_OUTER_SCTP_CKSUM, PKT_TX_OUTER_L4_MASK, NULL },
+		{ PKT_TX_OUTER_UDP_CKSUM, PKT_TX_OUTER_L4_MASK, NULL },
+		{ PKT_TX_OUTER_L4_NO_CKSUM, PKT_TX_OUTER_L4_MASK,
+		"PKT_TX_OUTER_L4_NO_CKSUM" },
 	};
 	const char *name;
 	unsigned int i;
diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h
index 80989483b..541521d7d 100644
--- a/lib/librte_mbuf/rte_mbuf.h
+++ b/lib/librte_mbuf/rte_mbuf.h
@@ -184,6 +184,26 @@ extern "C" {
 
 /* add new TX flags here */
 
+/**
+ * Bits 40+41 used for outer L4 packet type with checksum enabled: 00: Reserved,
+ * 01: Outer TCP checksum, 10: Outer SCTP checksum, 11: Outer UDP checksum.
+ * To use hardware outer L4 checksum offload, the user needs to:
+ *  - fill outer_l2_len and outer_l3_len in mbuf
+ *  - set the flags PKT_TX_OUTER_TCP_CKSUM, PKT_TX_OUTER_SCTP_CKSUM or
+ *  PKT_TX_OUTER_UDP_CKSUM
+ *  - set the flag PKT_TX_OUTER_IPV4 or PKT_TX_OUTER_IPV6
+ */
+#define PKT_TX_OUTER_L4_NO_CKSUM   (0ULL << 40)
+/**< Disable Outer L4 cksum of TX pkt. */
+#define PKT_TX_OUTER_TCP_CKSUM     (1ULL << 40)
+/**< Outer TCP cksum of TX pkt. computed by NIC. */
+#define PKT_TX_OUTER_SCTP_CKSUM    (2ULL << 40)
+/**< Outer SCTP cksum of TX pkt. computed by NIC. */
+#define PKT_TX_OUTER_UDP_CKSUM     (3ULL << 40)
+/**< Outer UDP cksum of TX pkt. computed by NIC. */
+#define PKT_TX_OUTER_L4_MASK       (3ULL << 40)
+/**< Mask for Outer L4 cksum offload request. */
+
 /**
  * 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
@@ -347,7 +367,8 @@ extern "C" {
 		PKT_TX_TUNNEL_MASK |	 \
 		PKT_TX_MACSEC |		 \
 		PKT_TX_SEC_OFFLOAD |	\
-		PKT_TX_UDP_SEG)
+		PKT_TX_UDP_SEG |	\
+		PKT_TX_OUTER_L4_MASK)
 
 /**
  * Mbuf having an external buffer attached. shinfo in mbuf must be filled.
-- 
2.19.0