[PATCH v3 2/7] examples/ipsec-secgw: disable Tx chksum offload for inline

[Nithin Dabilpuram <ndabilpuram@marvell.com>]

Enable Tx IPv4 checksum offload only when Tx inline crypto, lookaside
crypto/protocol or cpu crypto is needed.
For Tx Inline protocol offload, checksum computation
is implicitly taken care by HW.

Signed-off-by: Nithin Dabilpuram <ndabilpuram@marvell.com>
---
 examples/ipsec-secgw/ipsec-secgw.c |  3 ---
 examples/ipsec-secgw/sa.c          | 46 ++++++++++++++++++++++++++++++++------
 2 files changed, 39 insertions(+), 10 deletions(-)

diff --git a/examples/ipsec-secgw/ipsec-secgw.c b/examples/ipsec-secgw/ipsec-secgw.c
index 959a20b..5fe5eee 100644
--- a/examples/ipsec-secgw/ipsec-secgw.c
+++ b/examples/ipsec-secgw/ipsec-secgw.c
@@ -1761,9 +1761,6 @@ port_init(uint16_t portid, uint64_t req_rx_offloads, uint64_t req_tx_offloads)
 		local_port_conf.txmode.offloads |=
 			RTE_ETH_TX_OFFLOAD_MBUF_FAST_FREE;
 
-	if (dev_info.tx_offload_capa & RTE_ETH_TX_OFFLOAD_IPV4_CKSUM)
-		local_port_conf.txmode.offloads |= RTE_ETH_TX_OFFLOAD_IPV4_CKSUM;
-
 	printf("port %u configuring rx_offloads=0x%" PRIx64
 		", tx_offloads=0x%" PRIx64 "\n",
 		portid, local_port_conf.rxmode.offloads,
diff --git a/examples/ipsec-secgw/sa.c b/examples/ipsec-secgw/sa.c
index 1839ac7..e8f2598 100644
--- a/examples/ipsec-secgw/sa.c
+++ b/examples/ipsec-secgw/sa.c
@@ -1766,10 +1766,18 @@ sa_check_offloads(uint16_t port_id, uint64_t *rx_offloads,
 	struct ipsec_sa *rule;
 	uint32_t idx_sa;
 	enum rte_security_session_action_type rule_type;
+	struct rte_eth_dev_info dev_info;
+	int ret;
 
 	*rx_offloads = 0;
 	*tx_offloads = 0;
 
+	ret = rte_eth_dev_info_get(port_id, &dev_info);
+	if (ret != 0)
+		rte_exit(EXIT_FAILURE,
+			"Error during getting device (port %u) info: %s\n",
+			port_id, strerror(-ret));
+
 	/* Check for inbound rules that use offloads and use this port */
 	for (idx_sa = 0; idx_sa < nb_sa_in; idx_sa++) {
 		rule = &sa_in[idx_sa];
@@ -1785,13 +1793,37 @@ sa_check_offloads(uint16_t port_id, uint64_t *rx_offloads,
 	for (idx_sa = 0; idx_sa < nb_sa_out; idx_sa++) {
 		rule = &sa_out[idx_sa];
 		rule_type = ipsec_get_action_type(rule);
-		if ((rule_type == RTE_SECURITY_ACTION_TYPE_INLINE_CRYPTO ||
-				rule_type ==
-				RTE_SECURITY_ACTION_TYPE_INLINE_PROTOCOL)
-				&& rule->portid == port_id) {
-			*tx_offloads |= RTE_ETH_TX_OFFLOAD_SECURITY;
-			if (rule->mss)
-				*tx_offloads |= RTE_ETH_TX_OFFLOAD_TCP_TSO;
+		switch (rule_type) {
+		case RTE_SECURITY_ACTION_TYPE_INLINE_PROTOCOL:
+			/* Checksum offload is not needed for inline protocol as
+			 * all processing for Outbound IPSec packets will be
+			 * implicitly taken care and for non-IPSec packets,
+			 * there is no need of IPv4 Checksum offload.
+			 */
+			if (rule->portid == port_id) {
+				*tx_offloads |= RTE_ETH_TX_OFFLOAD_SECURITY;
+				if (rule->mss)
+					*tx_offloads |= (RTE_ETH_TX_OFFLOAD_TCP_TSO |
+							 RTE_ETH_TX_OFFLOAD_IPV4_CKSUM);
+			}
+			break;
+		case RTE_SECURITY_ACTION_TYPE_INLINE_CRYPTO:
+			if (rule->portid == port_id) {
+				*tx_offloads |= RTE_ETH_TX_OFFLOAD_SECURITY;
+				if (rule->mss)
+					*tx_offloads |=
+						RTE_ETH_TX_OFFLOAD_TCP_TSO;
+				*tx_offloads |= RTE_ETH_TX_OFFLOAD_IPV4_CKSUM;
+			}
+			break;
+		default:
+			/* Enable IPv4 checksum offload even if one of lookaside
+			 * SA's are present.
+			 */
+			if (dev_info.tx_offload_capa &
+			    RTE_ETH_TX_OFFLOAD_IPV4_CKSUM)
+				*tx_offloads |= RTE_ETH_TX_OFFLOAD_IPV4_CKSUM;
+			break;
 		}
 	}
 	return 0;
-- 
2.8.4