[v2] app/testpmd: support the query of link flow ctrl info

diff --git a/app/test-pmd/cmdline.c b/app/test-pmd/cmdline.c
index 31884c5..06a6503 100644
--- a/app/test-pmd/cmdline.c
+++ b/app/test-pmd/cmdline.c
@@ -258,6 +258,9 @@  static void cmd_help_long_parsed(void *parsed_result,
 
 			"show port (port_id) fec_mode"
 			"	Show fec mode of a port.\n\n"
+
+			"show port <port_id> flow_ctrl"
+			"	Show flow control info of a port.\n\n"
 		);
 	}
 
@@ -6899,6 +6902,85 @@  cmdline_parse_inst_t cmd_set_allmulti_mode_one = {
 	},
 };
 
+/* *** GET CURRENT ETHERNET LINK FLOW CONTROL *** */
+struct cmd_link_flow_ctrl_show {
+	cmdline_fixed_string_t show;
+	cmdline_fixed_string_t port;
+	portid_t port_id;
+	cmdline_fixed_string_t flow_ctrl;
+};
+
+cmdline_parse_token_string_t cmd_lfc_show_show =
+	TOKEN_STRING_INITIALIZER(struct cmd_link_flow_ctrl_show,
+				show, "show");
+cmdline_parse_token_string_t cmd_lfc_show_port =
+	TOKEN_STRING_INITIALIZER(struct cmd_link_flow_ctrl_show,
+				port, "port");
+cmdline_parse_token_num_t cmd_lfc_show_portid =
+	TOKEN_NUM_INITIALIZER(struct cmd_link_flow_ctrl_show,
+				port_id, RTE_UINT16);
+cmdline_parse_token_string_t cmd_lfc_show_flow_ctrl =
+	TOKEN_STRING_INITIALIZER(struct cmd_link_flow_ctrl_show,
+				flow_ctrl, "flow_ctrl");
+
+static void
+cmd_link_flow_ctrl_show_parsed(void *parsed_result,
+			      __rte_unused struct cmdline *cl,
+			      __rte_unused void *data)
+{
+	struct cmd_link_flow_ctrl_show *res = parsed_result;
+	static const char *info_border = "*********************";
+	struct rte_eth_fc_conf fc_conf;
+	bool rx_fc_en = false;
+	bool tx_fc_en = false;
+	int ret;
+
+	if (!rte_eth_dev_is_valid_port(res->port_id)) {
+		printf("Invalid port id %u\n", res->port_id);
+		return;
+	}
+
+	ret = rte_eth_dev_flow_ctrl_get(res->port_id, &fc_conf);
+	if (ret != 0) {
+		printf("Failed to get current flow ctrl information: err = %d\n",
+		       ret);
+		return;
+	}
+
+	if ((fc_conf.mode == RTE_FC_RX_PAUSE) || (fc_conf.mode == RTE_FC_FULL))
+		rx_fc_en = true;
+	if ((fc_conf.mode == RTE_FC_TX_PAUSE) || (fc_conf.mode == RTE_FC_FULL))
+		tx_fc_en = true;
+
+	printf("\n%s Flow control infos for port %-2d %s\n",
+		info_border, res->port_id, info_border);
+	printf("FC mode:\n");
+	printf("   Rx: %s\n", rx_fc_en ? "On" : "Off");
+	printf("   Tx: %s\n", tx_fc_en ? "On" : "Off");
+	printf("FC autoneg status: %s\n", fc_conf.autoneg ? "On" : "Off");
+	printf("pause_time: 0x%x\n", fc_conf.pause_time);
+	printf("high_water: 0x%x\n", fc_conf.high_water);
+	printf("low_water: 0x%x\n", fc_conf.low_water);
+	printf("Send Xon: %s\n", fc_conf.send_xon ? "On" : "Off");
+	printf("Forward MAC control frames: %s\n",
+		fc_conf.mac_ctrl_frame_fwd ? "On" : "Off");
+	printf("\n%s**************   End  ***********%s\n",
+		info_border, info_border);
+}
+
+cmdline_parse_inst_t cmd_link_flow_control_show = {
+	.f = cmd_link_flow_ctrl_show_parsed,
+	.data = NULL,
+	.help_str = "show port <port_id> flow_ctrl",
+	.tokens = {
+		(void *)&cmd_lfc_show_show,
+		(void *)&cmd_lfc_show_port,
+		(void *)&cmd_lfc_show_portid,
+		(void *)&cmd_lfc_show_flow_ctrl,
+		NULL,
+	},
+};
+
 /* *** SETUP ETHERNET LINK FLOW CONTROL *** */
 struct cmd_link_flow_ctrl_set_result {
 	cmdline_fixed_string_t set;
@@ -17037,6 +17119,7 @@  cmdline_parse_ctx_t main_ctx[] = {
 	(cmdline_parse_inst_t *)&cmd_link_flow_control_set_xon,
 	(cmdline_parse_inst_t *)&cmd_link_flow_control_set_macfwd,
 	(cmdline_parse_inst_t *)&cmd_link_flow_control_set_autoneg,
+	(cmdline_parse_inst_t *)&cmd_link_flow_control_show,
 	(cmdline_parse_inst_t *)&cmd_priority_flow_control_set,
 	(cmdline_parse_inst_t *)&cmd_config_dcb,
 	(cmdline_parse_inst_t *)&cmd_read_reg,
diff --git a/doc/guides/testpmd_app_ug/testpmd_funcs.rst b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
index 9854b70..a7dbaf2 100644
--- a/doc/guides/testpmd_app_ug/testpmd_funcs.rst
+++ b/doc/guides/testpmd_app_ug/testpmd_funcs.rst
@@ -1524,6 +1524,13 @@  Where:
 
 * ``autoneg``: Change the auto-negotiation parameter.
 
+show flow ctrl
+~~~~~~~~~~~~~~
+
+show the link flow control parameter on a port::
+
+   testpmd> show port <port_id> flow_ctrl
+
 set pfc_ctrl rx
 ~~~~~~~~~~~~~~~