[PATCH v2 18/28] net/cnxk: support decrement TTL for inline IPsec

[Nithin Dabilpuram <ndabilpuram@marvell.com>]

From: Akhil Goyal <gakhil@marvell.com>

Added support for decrementing TTL(IPv4)/hoplimit(IPv6)
while doing inline IPsec processing if the security session
sa options is enabled with dec_ttl.

Signed-off-by: Akhil Goyal <gakhil@marvell.com>
---
 drivers/net/cnxk/cn10k_ethdev.h     | 3 ++-
 drivers/net/cnxk/cn10k_ethdev_sec.c | 1 +
 drivers/net/cnxk/cn10k_tx.h         | 6 ++++--
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/net/cnxk/cn10k_ethdev.h b/drivers/net/cnxk/cn10k_ethdev.h
index 9642d6a..c8666ce 100644
--- a/drivers/net/cnxk/cn10k_ethdev.h
+++ b/drivers/net/cnxk/cn10k_ethdev.h
@@ -73,7 +73,8 @@ struct cn10k_sec_sess_priv {
 			uint8_t roundup_len;
 			uint16_t partial_len : 10;
 			uint16_t chksum : 2;
-			uint16_t rsvd : 4;
+			uint16_t dec_ttl : 1;
+			uint16_t rsvd : 3;
 		};
 
 		uint64_t u64;
diff --git a/drivers/net/cnxk/cn10k_ethdev_sec.c b/drivers/net/cnxk/cn10k_ethdev_sec.c
index 60b7093..f32e169 100644
--- a/drivers/net/cnxk/cn10k_ethdev_sec.c
+++ b/drivers/net/cnxk/cn10k_ethdev_sec.c
@@ -556,6 +556,7 @@ cn10k_eth_sec_session_create(void *device,
 		/* Propagate inner checksum enable from SA to fast path */
 		sess_priv.chksum = (!ipsec->options.ip_csum_enable << 1 |
 				    !ipsec->options.l4_csum_enable);
+		sess_priv.dec_ttl = ipsec->options.dec_ttl;
 
 		/* Pointer from eth_sec -> outb_sa */
 		eth_sec->sa = outb_sa;
diff --git a/drivers/net/cnxk/cn10k_tx.h b/drivers/net/cnxk/cn10k_tx.h
index c25825c..c482352 100644
--- a/drivers/net/cnxk/cn10k_tx.h
+++ b/drivers/net/cnxk/cn10k_tx.h
@@ -315,7 +315,8 @@ cn10k_nix_prep_sec_vec(struct rte_mbuf *m, uint64x2_t *cmd0, uint64x2_t *cmd1,
 	sa = (uintptr_t)roc_nix_inl_ot_ipsec_outb_sa(sa_base, sess_priv.sa_idx);
 	ucode_cmd[3] = (ROC_CPT_DFLT_ENG_GRP_SE_IE << 61 | 1UL << 60 | sa);
 	ucode_cmd[0] = (ROC_IE_OT_MAJOR_OP_PROCESS_OUTBOUND_IPSEC << 48 |
-			((uint64_t)sess_priv.chksum) << 32 | pkt_len);
+			((uint64_t)sess_priv.chksum) << 32 |
+			((uint64_t)sess_priv.dec_ttl) << 34 | pkt_len);
 
 	/* CPT Word 0 and Word 1 */
 	cmd01 = vdupq_n_u64((nixtx + 16) | (cn10k_nix_tx_ext_subs(flags) + 1));
@@ -442,7 +443,8 @@ cn10k_nix_prep_sec(struct rte_mbuf *m, uint64_t *cmd, uintptr_t *nixtx_addr,
 	sa = (uintptr_t)roc_nix_inl_ot_ipsec_outb_sa(sa_base, sess_priv.sa_idx);
 	ucode_cmd[3] = (ROC_CPT_DFLT_ENG_GRP_SE_IE << 61 | 1UL << 60 | sa);
 	ucode_cmd[0] = (ROC_IE_OT_MAJOR_OP_PROCESS_OUTBOUND_IPSEC << 48 |
-			((uint64_t)sess_priv.chksum) << 32 | pkt_len);
+			((uint64_t)sess_priv.chksum) << 32 |
+			((uint64_t)sess_priv.dec_ttl) << 34 | pkt_len);
 
 	/* CPT Word 0 and Word 1. Assume no multi-seg support */
 	cmd01 = vdupq_n_u64((nixtx + 16) | (cn10k_nix_tx_ext_subs(flags) + 1));
-- 
2.8.4