[dpdk-dev] [PATCH v4] testpmd: fix wrong prompt in tx_vlan set command handler

[Wang Xiao W <xiao.w.wang@intel.com>]

When using testpmd, sometimes we forget the right order of port_id and
vid in "tx_vlan set (port_id) vlan_id[, vlan_id_outer]\n" command, and
input "tx_vlan set 51 0", we'll get a strange prompt saying "Error, as
QinQ has been enabled.".

In cmd_tx_vlan_set_parsed function, the first thing we do is checking
the port's vlan_offload capability, rather than checking validity of the
port_id, therefore if it's an invalid port_id we'll get the above wrong
message. We should always make sure that we get a valid port_id before
we do other things.

It's the similar issue for cmd_tx_vlan_set_qinq_parsed function.

Fixes: 92ebda07ee58 ("app/testpmd: add qinq stripping and insertion")

Signed-off-by: Wang Xiao W <xiao.w.wang@intel.com>
---
v4:
* Added fixes line.

v3:
* Reworded the patch subject and commit message, added detail for reproducing
  the bug.

* Reordered the definitions of cmd_tx_vlan_set_portid and cmd_tx_vlan_set_vlanid
  to keep in consistency with cmd_tx_vlan_set.tokens.

v2:
* Removed the bug fix unrelated code change to make this patch a pure bug fix
  patch.

* Fixed the "PATCH 1/2" mistake in the patch title, rewrote the subject.
---
 app/test-pmd/cmdline.c | 18 +++---------------
 app/test-pmd/config.c  | 16 ++++++++++++++++
 2 files changed, 19 insertions(+), 15 deletions(-)

diff --git a/app/test-pmd/cmdline.c b/app/test-pmd/cmdline.c
index 6d28c1b..52179e6 100644
--- a/app/test-pmd/cmdline.c
+++ b/app/test-pmd/cmdline.c
@@ -2954,12 +2954,6 @@ cmd_tx_vlan_set_parsed(void *parsed_result,
 		       __attribute__((unused)) void *data)
 {
 	struct cmd_tx_vlan_set_result *res = parsed_result;
-	int vlan_offload = rte_eth_dev_get_vlan_offload(res->port_id);
-
-	if (vlan_offload & ETH_VLAN_EXTEND_OFFLOAD) {
-		printf("Error, as QinQ has been enabled.\n");
-		return;
-	}
 
 	tx_vlan_set(res->port_id, res->vlan_id);
 }
@@ -2970,12 +2964,12 @@ cmdline_parse_token_string_t cmd_tx_vlan_set_tx_vlan =
 cmdline_parse_token_string_t cmd_tx_vlan_set_set =
 	TOKEN_STRING_INITIALIZER(struct cmd_tx_vlan_set_result,
 				 set, "set");
-cmdline_parse_token_num_t cmd_tx_vlan_set_vlanid =
-	TOKEN_NUM_INITIALIZER(struct cmd_tx_vlan_set_result,
-			      vlan_id, UINT16);
 cmdline_parse_token_num_t cmd_tx_vlan_set_portid =
 	TOKEN_NUM_INITIALIZER(struct cmd_tx_vlan_set_result,
 			      port_id, UINT8);
+cmdline_parse_token_num_t cmd_tx_vlan_set_vlanid =
+	TOKEN_NUM_INITIALIZER(struct cmd_tx_vlan_set_result,
+			      vlan_id, UINT16);
 
 cmdline_parse_inst_t cmd_tx_vlan_set = {
 	.f = cmd_tx_vlan_set_parsed,
@@ -3006,12 +3000,6 @@ cmd_tx_vlan_set_qinq_parsed(void *parsed_result,
 			    __attribute__((unused)) void *data)
 {
 	struct cmd_tx_vlan_set_qinq_result *res = parsed_result;
-	int vlan_offload = rte_eth_dev_get_vlan_offload(res->port_id);
-
-	if (!(vlan_offload & ETH_VLAN_EXTEND_OFFLOAD)) {
-		printf("Error, as QinQ hasn't been enabled.\n");
-		return;
-	}
 
 	tx_qinq_set(res->port_id, res->vlan_id, res->vlan_id_outer);
 }
diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
index 7088f6f..956d29c 100644
--- a/app/test-pmd/config.c
+++ b/app/test-pmd/config.c
@@ -1839,10 +1839,18 @@ vlan_tpid_set(portid_t port_id, uint16_t tp_id)
 void
 tx_vlan_set(portid_t port_id, uint16_t vlan_id)
 {
+	int vlan_offload;
 	if (port_id_is_invalid(port_id, ENABLED_WARN))
 		return;
 	if (vlan_id_is_invalid(vlan_id))
 		return;
+
+	vlan_offload = rte_eth_dev_get_vlan_offload(port_id);
+	if (vlan_offload & ETH_VLAN_EXTEND_OFFLOAD) {
+		printf("Error, as QinQ has been enabled.\n");
+		return;
+	}
+
 	tx_vlan_reset(port_id);
 	ports[port_id].tx_ol_flags |= TESTPMD_TX_OFFLOAD_INSERT_VLAN;
 	ports[port_id].tx_vlan_id = vlan_id;
@@ -1851,12 +1859,20 @@ tx_vlan_set(portid_t port_id, uint16_t vlan_id)
 void
 tx_qinq_set(portid_t port_id, uint16_t vlan_id, uint16_t vlan_id_outer)
 {
+	int vlan_offload;
 	if (port_id_is_invalid(port_id, ENABLED_WARN))
 		return;
 	if (vlan_id_is_invalid(vlan_id))
 		return;
 	if (vlan_id_is_invalid(vlan_id_outer))
 		return;
+
+	vlan_offload = rte_eth_dev_get_vlan_offload(port_id);
+	if (!(vlan_offload & ETH_VLAN_EXTEND_OFFLOAD)) {
+		printf("Error, as QinQ hasn't been enabled.\n");
+		return;
+	}
+
 	tx_vlan_reset(port_id);
 	ports[port_id].tx_ol_flags |= TESTPMD_TX_OFFLOAD_INSERT_QINQ;
 	ports[port_id].tx_vlan_id = vlan_id;
-- 
1.9.3