[dpdk-dev] [PATCH V1 2/2] examples/ethtool: support the query of MTU

["Min Hu (Connor)" <humin29@huawei.com>]

From: Huisong Li <lihuisong@huawei.com>

This patch supports the query of MTU.

Signed-off-by: Huisong Li <lihuisong@huawei.com>
---
 examples/ethtool/ethtool-app/ethapp.c | 48 +++++++++++++++++++++++++----------
 examples/ethtool/lib/rte_ethtool.c    |  7 +++++
 examples/ethtool/lib/rte_ethtool.h    | 14 ++++++++++
 3 files changed, 56 insertions(+), 13 deletions(-)

diff --git a/examples/ethtool/ethtool-app/ethapp.c b/examples/ethtool/ethtool-app/ethapp.c
index fc743ce..aed4bc5 100644
--- a/examples/ethtool/ethtool-app/ethapp.c
+++ b/examples/ethtool/ethtool-app/ethapp.c
@@ -517,31 +517,41 @@ pcmd_macaddr_callback(void *ptr_params,
 static void
 pcmd_mtu_callback(void *ptr_params,
 	__rte_unused struct cmdline *ctx,
-	__rte_unused void *ptr_data)
+	void *ptr_data)
 {
 	struct pcmd_intstr_params *params = ptr_params;
 	int stat;
 	uint16_t new_mtu;
 	char *ptr_parse_end;
 
-	new_mtu = strtoul(params->opt, &ptr_parse_end, 10);
-	if (*ptr_parse_end != '\0' ||
-			new_mtu < RTE_ETHER_MIN_MTU ||
-			new_mtu > RTE_ETHER_MAX_JUMBO_FRAME_LEN) {
-		printf("Port %i: Invalid MTU value\n", params->port);
+	if (ptr_data == NULL) {
+		new_mtu = strtoul(params->opt, &ptr_parse_end, 10);
+		if (*ptr_parse_end != '\0' ||
+				new_mtu < RTE_ETHER_MIN_MTU ||
+				new_mtu > RTE_ETHER_MAX_JUMBO_FRAME_LEN) {
+			printf("Port %i: Invalid MTU value\n", params->port);
+			return;
+		}
+		stat = rte_ethtool_net_change_mtu(params->port, new_mtu);
+		if (stat == 0)
+			printf("Port %i: MTU set to %i\n", params->port,
+				new_mtu);
+		else if (stat == -ENOTSUP)
+			printf("Port %i: Operation not supported\n",
+				params->port);
+		else
+			printf("Port %i: Error setting MTU\n", params->port);
+
 		return;
 	}
-	stat = rte_ethtool_net_change_mtu(params->port, new_mtu);
-	if (stat == 0)
-		printf("Port %i: MTU set to %i\n", params->port, new_mtu);
-	else if (stat == -ENOTSUP)
+
+	stat = rte_ethtool_net_get_mtu(params->port, &new_mtu);
+	if (stat)
 		printf("Port %i: Operation not supported\n", params->port);
 	else
-		printf("Port %i: Error setting MTU\n", params->port);
+		printf("Port %i: Current MTU: %i\n", params->port, new_mtu);
 }
 
-
-
 static void pcmd_portstats_callback(__rte_unused void *ptr_params,
 	__rte_unused struct cmdline *ctx,
 	__rte_unused void *ptr_data)
@@ -799,6 +809,17 @@ cmdline_parse_inst_t pcmd_macaddr = {
 		NULL
 	},
 };
+cmdline_parse_inst_t pcmd_mtu_get = {
+	.f = pcmd_mtu_callback,
+	.data = (void *)0x01,
+	.help_str = "mtu <port_id>\n"
+		"     Get MTU",
+	.tokens = {
+		(void *)&pcmd_mtu_token_cmd,
+		(void *)&pcmd_intstr_token_port,
+		NULL
+	},
+};
 cmdline_parse_inst_t pcmd_mtu = {
 	.f = pcmd_mtu_callback,
 	.data = NULL,
@@ -879,6 +900,7 @@ cmdline_parse_ctx_t list_prompt_commands[] = {
 	(cmdline_parse_inst_t *)&pcmd_link,
 	(cmdline_parse_inst_t *)&pcmd_macaddr_get,
 	(cmdline_parse_inst_t *)&pcmd_macaddr,
+	(cmdline_parse_inst_t *)&pcmd_mtu_get,
 	(cmdline_parse_inst_t *)&pcmd_mtu,
 	(cmdline_parse_inst_t *)&pcmd_open,
 	(cmdline_parse_inst_t *)&pcmd_pause_noopt,
diff --git a/examples/ethtool/lib/rte_ethtool.c b/examples/ethtool/lib/rte_ethtool.c
index 73193ed..e69b2c1 100644
--- a/examples/ethtool/lib/rte_ethtool.c
+++ b/examples/ethtool/lib/rte_ethtool.c
@@ -345,6 +345,13 @@ rte_ethtool_net_validate_addr(uint16_t port_id __rte_unused,
 	return rte_is_valid_assigned_ether_addr(addr);
 }
 
+int
+rte_ethtool_net_get_mtu(uint16_t port_id, uint16_t *mtu)
+{
+	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
+
+	return rte_eth_dev_get_mtu(port_id, mtu);
+}
 
 int
 rte_ethtool_net_change_mtu(uint16_t port_id, uint16_t mtu)
diff --git a/examples/ethtool/lib/rte_ethtool.h b/examples/ethtool/lib/rte_ethtool.h
index fe3250e..434ad1d 100644
--- a/examples/ethtool/lib/rte_ethtool.h
+++ b/examples/ethtool/lib/rte_ethtool.h
@@ -23,6 +23,7 @@
  * rte_ethtool_net_stop:            net_device_ops::ndo_stop
  * rte_ethtool_net_set_mac_addr:    net_device_ops::ndo_set_mac_address
  * rte_ethtool_net_validate_addr:   net_device_ops::ndo_validate_addr
+ * rte_ethtool_net_get_mtu:         net_device_ops::ndo_get_mtu
  * rte_ethtool_net_change_mtu:      net_device_ops::ndo_change_mtu
  * rte_ethtool_net_get_stats64:     net_device_ops::ndo_get_stats64
  * rte_ethtool_net_vlan_rx_add_vid  net_device_ops::ndo_vlan_rx_add_vid
@@ -296,6 +297,19 @@ int rte_ethtool_net_validate_addr(uint16_t port_id,
 				struct rte_ether_addr *addr);
 
 /**
+ * Retrieve the MTU of an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ * @param mtu
+ *   A pointer to a uint16_t where the retrieved MTU is to be stored.
+ * @return
+ *   - (0) if successful.
+ *   - (-ENODEV) if *port_id* invalid.
+ */
+int rte_ethtool_net_get_mtu(uint16_t port_id, uint16_t *mtu);
+
+/**
  * Setting the Ethernet device maximum Tx unit.
  *
  * @param port_id
-- 
2.8.1