diff --git a/drivers/net/ark/ark_ethdev.c b/drivers/net/ark/ark_ethdev.c
index c061f7b..55e6b24 100644
--- a/drivers/net/ark/ark_ethdev.c
+++ b/drivers/net/ark/ark_ethdev.c
@@ -77,6 +77,7 @@ static int eth_ark_macaddr_add(struct rte_eth_dev *dev,
 			       uint32_t pool);
 static void eth_ark_macaddr_remove(struct rte_eth_dev *dev,
 				   uint32_t index);
+static int  eth_ark_set_mtu(struct rte_eth_dev *dev, uint16_t size);
 
 /*
  * The packet generator is a functional block used to generate packet
@@ -179,6 +180,8 @@ static void eth_ark_macaddr_remove(struct rte_eth_dev *dev,
 	.mac_addr_add = eth_ark_macaddr_add,
 	.mac_addr_remove = eth_ark_macaddr_remove,
 	.mac_addr_set = eth_ark_set_default_mac_addr,
+
+	.mtu_set = eth_ark_set_mtu,
 };
 
 static int
@@ -256,6 +259,10 @@ static void eth_ark_macaddr_remove(struct rte_eth_dev *dev,
 		(void (*)(struct rte_eth_dev *, struct ether_addr *,
 			  void *))
 		dlsym(ark->d_handle, "mac_addr_set");
+	ark->user_ext.set_mtu =
+		(int (*)(struct rte_eth_dev *, uint16_t,
+			  void *))
+		dlsym(ark->d_handle, "set_mtu");
 
 	return found;
 }
@@ -346,8 +353,9 @@ static void eth_ark_macaddr_remove(struct rte_eth_dev *dev,
 	}
 
 	if (ark->user_ext.dev_init) {
-		ark->user_data = ark->user_ext.dev_init(dev, ark->a_bar, 0);
-		if (!ark->user_data) {
+		ark->user_data[dev->data->port_id] =
+			ark->user_ext.dev_init(dev, ark->a_bar, 0);
+		if (!ark->user_data[dev->data->port_id]) {
 			PMD_DRV_LOG(INFO,
 				    "Failed to initialize PMD extension!"
 				    " continuing without it\n");
@@ -369,7 +377,8 @@ static void eth_ark_macaddr_remove(struct rte_eth_dev *dev,
 	 */
 	if (ark->user_ext.dev_get_port_count)
 		port_count =
-			ark->user_ext.dev_get_port_count(dev, ark->user_data);
+			ark->user_ext.dev_get_port_count(dev,
+				 ark->user_data[dev->data->port_id]);
 	ark->num_ports = port_count;
 
 	for (p = 0; p < port_count; p++) {
@@ -410,9 +419,10 @@ static void eth_ark_macaddr_remove(struct rte_eth_dev *dev,
 			goto error;
 		}
 
-		if (ark->user_ext.dev_init)
-			ark->user_data =
+		if (ark->user_ext.dev_init) {
+			ark->user_data[eth_dev->data->port_id] =
 				ark->user_ext.dev_init(dev, ark->a_bar, p);
+		}
 	}
 
 	return ret;
@@ -508,7 +518,8 @@ static void eth_ark_macaddr_remove(struct rte_eth_dev *dev,
 		return 0;
 
 	if (ark->user_ext.dev_uninit)
-		ark->user_ext.dev_uninit(dev, ark->user_data);
+		ark->user_ext.dev_uninit(dev,
+			 ark->user_data[dev->data->port_id]);
 
 	ark_pktgen_uninit(ark->pg);
 	ark_pktchkr_uninit(ark->pc);
@@ -529,7 +540,8 @@ static void eth_ark_macaddr_remove(struct rte_eth_dev *dev,
 
 	eth_ark_dev_set_link_up(dev);
 	if (ark->user_ext.dev_configure)
-		return ark->user_ext.dev_configure(dev, ark->user_data);
+		return ark->user_ext.dev_configure(dev,
+			   ark->user_data[dev->data->port_id]);
 	return 0;
 }
 
@@ -592,7 +604,8 @@ static void eth_ark_macaddr_remove(struct rte_eth_dev *dev,
 	}
 
 	if (ark->user_ext.dev_start)
-		ark->user_ext.dev_start(dev, ark->user_data);
+		ark->user_ext.dev_start(dev,
+			ark->user_data[dev->data->port_id]);
 
 	return 0;
 }
@@ -614,7 +627,8 @@ static void eth_ark_macaddr_remove(struct rte_eth_dev *dev,
 
 	/* Stop the extension first */
 	if (ark->user_ext.dev_stop)
-		ark->user_ext.dev_stop(dev, ark->user_data);
+		ark->user_ext.dev_stop(dev,
+		       ark->user_data[dev->data->port_id]);
 
 	/* Stop the packet generator */
 	if (ark->start_pg)
@@ -697,7 +711,8 @@ static void eth_ark_macaddr_remove(struct rte_eth_dev *dev,
 	uint16_t i;
 
 	if (ark->user_ext.dev_close)
-		ark->user_ext.dev_close(dev, ark->user_data);
+		ark->user_ext.dev_close(dev,
+		 ark->user_data[dev->data->port_id]);
 
 	eth_ark_dev_stop(dev);
 	eth_ark_udm_force_close(dev);
@@ -765,7 +780,7 @@ static void eth_ark_macaddr_remove(struct rte_eth_dev *dev,
 	if (ark->user_ext.link_update) {
 		return ark->user_ext.link_update
 			(dev, wait_to_complete,
-			 ark->user_data);
+			 ark->user_data[dev->data->port_id]);
 	}
 	return 0;
 }
@@ -778,7 +793,8 @@ static void eth_ark_macaddr_remove(struct rte_eth_dev *dev,
 		(struct ark_adapter *)dev->data->dev_private;
 
 	if (ark->user_ext.dev_set_link_up)
-		return ark->user_ext.dev_set_link_up(dev, ark->user_data);
+		return ark->user_ext.dev_set_link_up(dev,
+			     ark->user_data[dev->data->port_id]);
 	return 0;
 }
 
@@ -790,7 +806,8 @@ static void eth_ark_macaddr_remove(struct rte_eth_dev *dev,
 		(struct ark_adapter *)dev->data->dev_private;
 
 	if (ark->user_ext.dev_set_link_down)
-		return ark->user_ext.dev_set_link_down(dev, ark->user_data);
+		return ark->user_ext.dev_set_link_down(dev,
+		       ark->user_data[dev->data->port_id]);
 	return 0;
 }
 
@@ -813,7 +830,8 @@ static void eth_ark_macaddr_remove(struct rte_eth_dev *dev,
 	for (i = 0; i < dev->data->nb_rx_queues; i++)
 		eth_rx_queue_stats_get(dev->data->rx_queues[i], stats);
 	if (ark->user_ext.stats_get)
-		ark->user_ext.stats_get(dev, stats, ark->user_data);
+		ark->user_ext.stats_get(dev, stats,
+			ark->user_data[dev->data->port_id]);
 }
 
 static void
@@ -828,7 +846,8 @@ static void eth_ark_macaddr_remove(struct rte_eth_dev *dev,
 	for (i = 0; i < dev->data->nb_rx_queues; i++)
 		eth_rx_queue_stats_reset(dev->data->rx_queues[i]);
 	if (ark->user_ext.stats_reset)
-		ark->user_ext.stats_reset(dev, ark->user_data);
+		ark->user_ext.stats_reset(dev,
+			  ark->user_data[dev->data->port_id]);
 }
 
 static int
@@ -845,7 +864,7 @@ static void eth_ark_macaddr_remove(struct rte_eth_dev *dev,
 					   mac_addr,
 					   index,
 					   pool,
-					   ark->user_data);
+			   ark->user_data[dev->data->port_id]);
 		return 0;
 	}
 	return -ENOTSUP;
@@ -858,7 +877,8 @@ static void eth_ark_macaddr_remove(struct rte_eth_dev *dev,
 		(struct ark_adapter *)dev->data->dev_private;
 
 	if (ark->user_ext.mac_addr_remove)
-		ark->user_ext.mac_addr_remove(dev, index, ark->user_data);
+		ark->user_ext.mac_addr_remove(dev, index,
+			      ark->user_data[dev->data->port_id]);
 }
 
 static void
@@ -869,7 +889,22 @@ static void eth_ark_macaddr_remove(struct rte_eth_dev *dev,
 		(struct ark_adapter *)dev->data->dev_private;
 
 	if (ark->user_ext.mac_addr_set)
-		ark->user_ext.mac_addr_set(dev, mac_addr, ark->user_data);
+		ark->user_ext.mac_addr_set(dev, mac_addr,
+			   ark->user_data[dev->data->port_id]);
+}
+
+static int
+eth_ark_set_mtu(struct rte_eth_dev *dev, uint16_t  size)
+{
+	struct ark_adapter *ark =
+		(struct ark_adapter *)dev->data->dev_private;
+
+	if (ark->user_ext.set_mtu)
+		return ark->user_ext.set_mtu(dev, size,
+			     ark->user_data[dev->data->port_id]);
+
+	return -ENOTSUP;
+
 }
 
 static inline int
diff --git a/drivers/net/ark/ark_ext.h b/drivers/net/ark/ark_ext.h
index f805f64..63b7a26 100644
--- a/drivers/net/ark/ark_ext.h
+++ b/drivers/net/ark/ark_ext.h
@@ -112,4 +112,8 @@ void mac_addr_set(struct rte_eth_dev *dev,
 		  struct ether_addr *mac_addr,
 		  void *user_data);
 
+int set_mtu(struct rte_eth_dev *dev,
+	    uint16_t size,
+	    void *user_data);
+
 #endif
diff --git a/drivers/net/ark/ark_global.h b/drivers/net/ark/ark_global.h
index a2e9e8f..2a6375f 100644
--- a/drivers/net/ark/ark_global.h
+++ b/drivers/net/ark/ark_global.h
@@ -64,7 +64,7 @@
 #define ARK_RCPACING_BASE 0xb0000
 #define ARK_EXTERNAL_BASE 0x100000
 #define ARK_MPU_QOFFSET   0x00100
-#define ARK_MAX_PORTS     8
+#define ARK_MAX_PORTS     RTE_MAX_ETHPORTS
 
 #define offset8(n)     n
 #define offset16(n)   ((n) / 2)
@@ -106,11 +106,12 @@ struct ark_user_ext {
 						 void *);
 	void (*mac_addr_remove)(struct rte_eth_dev *, uint32_t, void *);
 	void (*mac_addr_set)(struct rte_eth_dev *, struct ether_addr *, void *);
+	int (*set_mtu)(struct rte_eth_dev *, uint16_t, void *);
 };
 
 struct ark_adapter {
 	/* User extension private data */
-	void *user_data;
+	void *user_data[ARK_MAX_PORTS];
 
 	/* Pointers to packet generator and checker */
 	int start_pg;
