[PATCH v2 3/3] app/testpmd: fix unnecessary change when set tunnel TSO

[Huisong Li]

Currently, there are two conditions to set tunnel TSO, like "parse tunnel"
and "outer IP checksum". If these conditions are not satisfied, testpmd
should not change their configuration, like tx_offloads on port and per
queue, and no need to request "reconfig device".

Fixes: 597f9fafe13b ("app/testpmd: convert to new Tx offloads API")
Cc: stable at dpdk.org

Signed-off-by: Huisong Li <lihuisong at huawei.com>
---
 app/test-pmd/cmdline.c | 25 ++++++++++++++-----------
 1 file changed, 14 insertions(+), 11 deletions(-)

diff --git a/app/test-pmd/cmdline.c b/app/test-pmd/cmdline.c
index 7a85cb0024..a37fbe07c2 100644
--- a/app/test-pmd/cmdline.c
+++ b/app/test-pmd/cmdline.c
@@ -5096,12 +5096,6 @@ cmd_tunnel_tso_set_parsed(void *parsed_result,
 				res->port_id);
 			return;
 		}
-		check_tunnel_tso_nic_support(res->port_id, dev_info.tx_offload_capa);
-
-		ports[res->port_id].dev_conf.txmode.offloads |=
-			(all_tunnel_tso & dev_info.tx_offload_capa);
-		printf("TSO segment size for tunneled packets is %d\n",
-			ports[res->port_id].tunnel_tso_segsz);
 
 		/* Below conditions are needed to make it work:
 		 * (1) tunnel TSO is supported by the NIC;
@@ -5114,14 +5108,23 @@ cmd_tunnel_tso_set_parsed(void *parsed_result,
 		 * is not necessary for IPv6 tunneled pkts because there's no
 		 * checksum in IP header anymore.
 		 */
-
-		if (!ports[res->port_id].parse_tunnel)
+		if (!ports[res->port_id].parse_tunnel) {
 			fprintf(stderr,
-				"Warning: csum parse_tunnel must be set so that tunneled packets are recognized\n");
+				"Error: csum parse_tunnel must be set so that tunneled packets are recognized\n");
+			return;
+		}
 		if (!(ports[res->port_id].dev_conf.txmode.offloads &
-		      RTE_ETH_TX_OFFLOAD_OUTER_IPV4_CKSUM))
+		      RTE_ETH_TX_OFFLOAD_OUTER_IPV4_CKSUM)) {
 			fprintf(stderr,
-				"Warning: csum set outer-ip must be set to hw if outer L3 is IPv4; not necessary for IPv6\n");
+				"Error: csum set outer-ip must be set to hw if outer L3 is IPv4; not necessary for IPv6\n");
+			return;
+		}
+
+		check_tunnel_tso_nic_support(res->port_id, dev_info.tx_offload_capa);
+		ports[res->port_id].dev_conf.txmode.offloads |=
+				(all_tunnel_tso & dev_info.tx_offload_capa);
+		printf("TSO segment size for tunneled packets is %d\n",
+			ports[res->port_id].tunnel_tso_segsz);
 	}
 
 	cmd_config_queue_tx_offloads(&ports[res->port_id]);
-- 
2.33.0