diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c
index baac7c3..1ed25b2 100644
--- a/lib/netdev-dpdk.c
+++ b/lib/netdev-dpdk.c
@@ -140,6 +140,8 @@ BUILD_ASSERT_DECL((MAX_NB_MBUF / ROUND_DOWN_POW2(MAX_NB_MBUF/MIN_NB_MBUF))
 #define OVS_VHOST_QUEUE_DISABLED    (-2) /* Queue was disabled by guest and not
                                           * yet mapped to another queue. */
 
+#define DPDK_ETH_PORT_ID_INVALID    RTE_MAX_ETHPORTS
+
 #define VHOST_ENQ_RETRY_NUM 8
 #define IF_NAME_SZ (PATH_MAX > IFNAMSIZ ? PATH_MAX : IFNAMSIZ)
 
@@ -309,7 +311,7 @@ struct dpdk_ring {
     struct rte_ring *cring_tx;
     struct rte_ring *cring_rx;
     unsigned int user_port_id; /* User given port no, parsed from port name */
-    int eth_port_id; /* ethernet device port id */
+    uint8_t eth_port_id; /* ethernet device port id */
     struct ovs_list list_node OVS_GUARDED_BY(dpdk_mutex);
 };
 
@@ -325,7 +327,7 @@ enum dpdk_hw_ol_features {
 
 struct netdev_dpdk {
     struct netdev up;
-    int port_id;
+    uint8_t port_id;
     int max_packet_len;
     enum dpdk_dev_type type;
 
@@ -402,7 +404,7 @@ struct netdev_dpdk {
 
 struct netdev_rxq_dpdk {
     struct netdev_rxq up;
-    int port_id;
+    uint8_t port_id;
 };
 
 static int netdev_dpdk_class_init(void);
@@ -603,12 +605,12 @@ check_link_status(struct netdev_dpdk *dev)
         dev->link_reset_cnt++;
         dev->link = link;
         if (dev->link.link_status) {
-            VLOG_DBG_RL(&rl, "Port %d Link Up - speed %u Mbps - %s",
+            VLOG_DBG_RL(&rl, "Port %"PRIu8" Link Up - speed %u Mbps - %s",
                         dev->port_id, (unsigned) dev->link.link_speed,
                         (dev->link.link_duplex == ETH_LINK_FULL_DUPLEX) ?
                          ("full-duplex") : ("half-duplex"));
         } else {
-            VLOG_DBG_RL(&rl, "Port %d Link Down", dev->port_id);
+            VLOG_DBG_RL(&rl, "Port %"PRIu8" Link Down", dev->port_id);
         }
     }
 }
@@ -726,8 +728,8 @@ dpdk_eth_checksum_offload_configure(struct netdev_dpdk *dev)
     if (rx_csum_ol_flag &&
         (info.rx_offload_capa & rx_chksm_offload_capa) !=
          rx_chksm_offload_capa) {
-        VLOG_WARN_ONCE("Rx checksum offload is not supported on device %d",
-                   dev->port_id);
+        VLOG_WARN_ONCE("Rx checksum offload is not supported on device %"PRIu8,
+                       dev->port_id);
         dev->hw_ol_features &= ~NETDEV_RX_CHECKSUM_OFFLOAD;
         return;
     }
@@ -738,7 +740,8 @@ static void
 dpdk_eth_flow_ctrl_setup(struct netdev_dpdk *dev) OVS_REQUIRES(dev->mutex)
 {
     if (rte_eth_dev_flow_ctrl_set(dev->port_id, &dev->fc_conf)) {
-        VLOG_WARN("Failed to enable flow control on device %d", dev->port_id);
+        VLOG_WARN("Failed to enable flow control on device %"PRIu8,
+                  dev->port_id);
     }
 }
 
@@ -776,7 +779,7 @@ dpdk_eth_dev_init(struct netdev_dpdk *dev)
 
     memset(&eth_addr, 0x0, sizeof(eth_addr));
     rte_eth_macaddr_get(dev->port_id, &eth_addr);
-    VLOG_INFO_RL(&rl, "Port %d: "ETH_ADDR_FMT,
+    VLOG_INFO_RL(&rl, "Port %"PRIu8": "ETH_ADDR_FMT,
                     dev->port_id, ETH_ADDR_BYTES_ARGS(eth_addr.addr_bytes));
 
     memcpy(dev->hwaddr.ea, eth_addr.addr_bytes, ETH_ADDR_LEN);
@@ -788,7 +791,7 @@ dpdk_eth_dev_init(struct netdev_dpdk *dev)
     /* Get the Flow control configuration for DPDK-ETH */
     diag = rte_eth_dev_flow_ctrl_get(dev->port_id, &dev->fc_conf);
     if (diag) {
-        VLOG_DBG("cannot get flow control parameters on port=%d, err=%d",
+        VLOG_DBG("cannot get flow control parameters on port=%"PRIu8", err=%d",
                  dev->port_id, diag);
     }
 
@@ -833,7 +836,7 @@ netdev_dpdk_alloc_txq(unsigned int n_txqs)
 }
 
 static int
-common_construct(struct netdev *netdev, unsigned int port_no,
+common_construct(struct netdev *netdev, uint8_t port_no,
                  enum dpdk_dev_type type, int socket_id)
     OVS_REQUIRES(dpdk_mutex)
 {
@@ -918,7 +921,8 @@ vhost_common_construct(struct netdev *netdev)
         return ENOMEM;
     }
 
-    return common_construct(netdev, -1, DPDK_DEV_VHOST, socket_id);
+    return common_construct(netdev, DPDK_ETH_PORT_ID_INVALID,
+                            DPDK_DEV_VHOST, socket_id);
 }
 
 static int
@@ -978,7 +982,8 @@ netdev_dpdk_construct(struct netdev *netdev)
     int err;
 
     ovs_mutex_lock(&dpdk_mutex);
-    err = common_construct(netdev, -1, DPDK_DEV_ETH, SOCKET0);
+    err = common_construct(netdev, DPDK_ETH_PORT_ID_INVALID,
+                           DPDK_DEV_ETH, SOCKET0);
     ovs_mutex_unlock(&dpdk_mutex);
     return err;
 }
@@ -1112,7 +1117,7 @@ netdev_dpdk_get_config(const struct netdev *netdev, struct smap *args)
 }
 
 static struct netdev_dpdk *
-netdev_dpdk_lookup_by_port_id(int port_id)
+netdev_dpdk_lookup_by_port_id(uint8_t port_id)
     OVS_REQUIRES(dpdk_mutex)
 {
     struct netdev_dpdk *dev;
@@ -1126,13 +1131,13 @@ netdev_dpdk_lookup_by_port_id(int port_id)
     return NULL;
 }
 
-static int
+static uint8_t
 netdev_dpdk_process_devargs(struct netdev_dpdk *dev,
                             const char *devargs, char **errp)
 {
     /* Get the name up to the first comma. */
     char *name = xmemdup0(devargs, strcspn(devargs, ","));
-    uint8_t new_port_id = UINT8_MAX;
+    uint8_t new_port_id = DPDK_ETH_PORT_ID_INVALID;
 
     if (!rte_eth_dev_count()
             || rte_eth_dev_get_port_by_name(name, &new_port_id)
@@ -1145,7 +1150,7 @@ netdev_dpdk_process_devargs(struct netdev_dpdk *dev,
         } else {
             /* Attach unsuccessful */
             VLOG_WARN_BUF(errp, "Error attaching device '%s' to DPDK", devargs);
-            return -1;
+            new_port_id = DPDK_ETH_PORT_ID_INVALID;
         }
     }
 
@@ -1226,8 +1231,8 @@ netdev_dpdk_set_config(struct netdev *netdev, const struct smap *args,
          * is valid */
         if (!(dev->devargs && !strcmp(dev->devargs, new_devargs)
                && rte_eth_dev_is_valid_port(dev->port_id))) {
-            int new_port_id = netdev_dpdk_process_devargs(dev, new_devargs,
-                                                          errp);
+            uint8_t new_port_id = netdev_dpdk_process_devargs(dev, new_devargs,
+                                                              errp);
             if (!rte_eth_dev_is_valid_port(new_port_id)) {
                 err = EINVAL;
             } else if (new_port_id == dev->port_id) {
@@ -1235,6 +1240,7 @@ netdev_dpdk_set_config(struct netdev *netdev, const struct smap *args,
                 err = 0;
             } else {
                 struct netdev_dpdk *dup_dev;
+
                 dup_dev = netdev_dpdk_lookup_by_port_id(new_port_id);
                 if (dup_dev) {
                     VLOG_WARN_BUF(errp, "'%s' is trying to use device '%s' "
@@ -1244,6 +1250,7 @@ netdev_dpdk_set_config(struct netdev *netdev, const struct smap *args,
                     err = EADDRINUSE;
                 } else {
                     int sid = rte_eth_dev_socket_id(new_port_id);
+
                     dev->requested_socket_id = sid < 0 ? SOCKET0 : sid;
                     dev->devargs = xstrdup(new_devargs);
                     dev->port_id = new_port_id;
@@ -2049,7 +2056,7 @@ netdev_dpdk_get_stats(const struct netdev *netdev, struct netdev_stats *stats)
     int rte_xstats_len, rte_xstats_new_len, rte_xstats_ret;
 
     if (rte_eth_stats_get(dev->port_id, &rte_stats)) {
-        VLOG_ERR("Can't get ETH statistics for port: %i.", dev->port_id);
+        VLOG_ERR("Can't get ETH statistics for port: %"PRIu8, dev->port_id);
         ovs_mutex_unlock(&dev->mutex);
         return EPROTO;
     }
@@ -2057,7 +2064,7 @@ netdev_dpdk_get_stats(const struct netdev *netdev, struct netdev_stats *stats)
     /* Get length of statistics */
     rte_xstats_len = rte_eth_xstats_get_names(dev->port_id, NULL, 0);
     if (rte_xstats_len < 0) {
-        VLOG_WARN("Cannot get XSTATS values for port: %i", dev->port_id);
+        VLOG_WARN("Cannot get XSTATS values for port: %"PRIu8, dev->port_id);
         goto out;
     }
     /* Reserve memory for xstats names and values */
@@ -2069,7 +2076,7 @@ netdev_dpdk_get_stats(const struct netdev *netdev, struct netdev_stats *stats)
                                                   rte_xstats_names,
                                                   rte_xstats_len);
     if (rte_xstats_new_len != rte_xstats_len) {
-        VLOG_WARN("Cannot get XSTATS names for port: %i.", dev->port_id);
+        VLOG_WARN("Cannot get XSTATS names for port: %"PRIu8, dev->port_id);
         goto out;
     }
     /* Retreive xstats values */
@@ -2080,7 +2087,7 @@ netdev_dpdk_get_stats(const struct netdev *netdev, struct netdev_stats *stats)
         netdev_dpdk_convert_xstats(stats, rte_xstats, rte_xstats_names,
                                    rte_xstats_len);
     } else {
-        VLOG_WARN("Cannot get XSTATS values for port: %i.", dev->port_id);
+        VLOG_WARN("Cannot get XSTATS values for port: %"PRIu8, dev->port_id);
     }
 
 out:
@@ -2756,7 +2763,7 @@ netdev_dpdk_vhost_class_init(void)
 
 static int
 dpdk_ring_create(const char dev_name[], unsigned int port_no,
-                 unsigned int *eth_port_id)
+                 uint8_t *eth_port_id)
 {
     struct dpdk_ring *ring_pair;
     char *ring_name;
@@ -2808,7 +2815,7 @@ dpdk_ring_create(const char dev_name[], unsigned int port_no,
 }
 
 static int
-dpdk_ring_open(const char dev_name[], unsigned int *eth_port_id)
+dpdk_ring_open(const char dev_name[], uint8_t *eth_port_id)
     OVS_REQUIRES(dpdk_mutex)
 {
     struct dpdk_ring *ring_pair;
@@ -2857,7 +2864,7 @@ netdev_dpdk_ring_send(struct netdev *netdev, int qid,
 static int
 netdev_dpdk_ring_construct(struct netdev *netdev)
 {
-    unsigned int port_no = 0;
+    uint8_t port_no = 0;
     int err = 0;
 
     ovs_mutex_lock(&dpdk_mutex);
