Imported Upstream version 16.04

Change-Id: I77eadcd8538a9122e4773cbe55b24033dc451757
Signed-off-by: C.J. Collier <cjcollier@linuxfoundation.org>

1 files changed, 928 insertions, 0 deletions

diff --git a/examples/kni/main.c b/examples/kni/main.c
new file mode 100644
index 00000000..a5297f28
--- /dev/null
+++ b/examples/kni/main.c
@@ -0,0 +1,928 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in
+ *       the documentation and/or other materials provided with the
+ *       distribution.
+ *     * Neither the name of Intel Corporation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <string.h>
+#include <sys/queue.h>
+#include <stdarg.h>
+#include <errno.h>
+#include <getopt.h>
+
+#include <netinet/in.h>
+#include <linux/if.h>
+#include <linux/if_tun.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+#include <signal.h>
+
+#include <rte_common.h>
+#include <rte_log.h>
+#include <rte_memory.h>
+#include <rte_memcpy.h>
+#include <rte_memzone.h>
+#include <rte_eal.h>
+#include <rte_per_lcore.h>
+#include <rte_launch.h>
+#include <rte_atomic.h>
+#include <rte_lcore.h>
+#include <rte_branch_prediction.h>
+#include <rte_interrupts.h>
+#include <rte_pci.h>
+#include <rte_debug.h>
+#include <rte_ether.h>
+#include <rte_ethdev.h>
+#include <rte_ring.h>
+#include <rte_log.h>
+#include <rte_mempool.h>
+#include <rte_mbuf.h>
+#include <rte_string_fns.h>
+#include <rte_cycles.h>
+#include <rte_malloc.h>
+#include <rte_kni.h>
+
+/* Macros for printing using RTE_LOG */
+#define RTE_LOGTYPE_APP RTE_LOGTYPE_USER1
+
+/* Max size of a single packet */
+#define MAX_PACKET_SZ           2048
+
+/* Size of the data buffer in each mbuf */
+#define MBUF_DATA_SZ (MAX_PACKET_SZ + RTE_PKTMBUF_HEADROOM)
+
+/* Number of mbufs in mempool that is created */
+#define NB_MBUF                 (8192 * 16)
+
+/* How many packets to attempt to read from NIC in one go */
+#define PKT_BURST_SZ            32
+
+/* How many objects (mbufs) to keep in per-lcore mempool cache */
+#define MEMPOOL_CACHE_SZ        PKT_BURST_SZ
+
+/* Number of RX ring descriptors */
+#define NB_RXD                  128
+
+/* Number of TX ring descriptors */
+#define NB_TXD                  512
+
+/* Total octets in ethernet header */
+#define KNI_ENET_HEADER_SIZE    14
+
+/* Total octets in the FCS */
+#define KNI_ENET_FCS_SIZE       4
+
+#define KNI_US_PER_SECOND       1000000
+#define KNI_SECOND_PER_DAY      86400
+
+#define KNI_MAX_KTHREAD 32
+/*
+ * Structure of port parameters
+ */
+struct kni_port_params {
+	uint8_t port_id;/* Port ID */
+	unsigned lcore_rx; /* lcore ID for RX */
+	unsigned lcore_tx; /* lcore ID for TX */
+	uint32_t nb_lcore_k; /* Number of lcores for KNI multi kernel threads */
+	uint32_t nb_kni; /* Number of KNI devices to be created */
+	unsigned lcore_k[KNI_MAX_KTHREAD]; /* lcore ID list for kthreads */
+	struct rte_kni *kni[KNI_MAX_KTHREAD]; /* KNI context pointers */
+} __rte_cache_aligned;
+
+static struct kni_port_params *kni_port_params_array[RTE_MAX_ETHPORTS];
+
+
+/* Options for configuring ethernet port */
+static struct rte_eth_conf port_conf = {
+	.rxmode = {
+		.header_split = 0,      /* Header Split disabled */
+		.hw_ip_checksum = 0,    /* IP checksum offload disabled */
+		.hw_vlan_filter = 0,    /* VLAN filtering disabled */
+		.jumbo_frame = 0,       /* Jumbo Frame Support disabled */
+		.hw_strip_crc = 0,      /* CRC stripped by hardware */
+	},
+	.txmode = {
+		.mq_mode = ETH_MQ_TX_NONE,
+	},
+};
+
+/* Mempool for mbufs */
+static struct rte_mempool * pktmbuf_pool = NULL;
+
+/* Mask of enabled ports */
+static uint32_t ports_mask = 0;
+/* Ports set in promiscuous mode off by default. */
+static int promiscuous_on = 0;
+
+/* Structure type for recording kni interface specific stats */
+struct kni_interface_stats {
+	/* number of pkts received from NIC, and sent to KNI */
+	uint64_t rx_packets;
+
+	/* number of pkts received from NIC, but failed to send to KNI */
+	uint64_t rx_dropped;
+
+	/* number of pkts received from KNI, and sent to NIC */
+	uint64_t tx_packets;
+
+	/* number of pkts received from KNI, but failed to send to NIC */
+	uint64_t tx_dropped;
+};
+
+/* kni device statistics array */
+static struct kni_interface_stats kni_stats[RTE_MAX_ETHPORTS];
+
+static int kni_change_mtu(uint8_t port_id, unsigned new_mtu);
+static int kni_config_network_interface(uint8_t port_id, uint8_t if_up);
+
+static rte_atomic32_t kni_stop = RTE_ATOMIC32_INIT(0);
+
+/* Print out statistics on packets handled */
+static void
+print_stats(void)
+{
+	uint8_t i;
+
+	printf("\n**KNI example application statistics**\n"
+	       "======  ==============  ============  ============  ============  ============\n"
+	       " Port    Lcore(RX/TX)    rx_packets    rx_dropped    tx_packets    tx_dropped\n"
+	       "------  --------------  ------------  ------------  ------------  ------------\n");
+	for (i = 0; i < RTE_MAX_ETHPORTS; i++) {
+		if (!kni_port_params_array[i])
+			continue;
+
+		printf("%7d %10u/%2u %13"PRIu64" %13"PRIu64" %13"PRIu64" "
+							"%13"PRIu64"\n", i,
+					kni_port_params_array[i]->lcore_rx,
+					kni_port_params_array[i]->lcore_tx,
+						kni_stats[i].rx_packets,
+						kni_stats[i].rx_dropped,
+						kni_stats[i].tx_packets,
+						kni_stats[i].tx_dropped);
+	}
+	printf("======  ==============  ============  ============  ============  ============\n");
+}
+
+/* Custom handling of signals to handle stats and kni processing */
+static void
+signal_handler(int signum)
+{
+	/* When we receive a USR1 signal, print stats */
+	if (signum == SIGUSR1) {
+		print_stats();
+	}
+
+	/* When we receive a USR2 signal, reset stats */
+	if (signum == SIGUSR2) {
+		memset(&kni_stats, 0, sizeof(kni_stats));
+		printf("\n**Statistics have been reset**\n");
+		return;
+	}
+
+	/* When we receive a RTMIN or SIGINT signal, stop kni processing */
+	if (signum == SIGRTMIN || signum == SIGINT){
+		printf("SIGRTMIN is received, and the KNI processing is "
+							"going to stop\n");
+		rte_atomic32_inc(&kni_stop);
+		return;
+        }
+}
+
+static void
+kni_burst_free_mbufs(struct rte_mbuf **pkts, unsigned num)
+{
+	unsigned i;
+
+	if (pkts == NULL)
+		return;
+
+	for (i = 0; i < num; i++) {
+		rte_pktmbuf_free(pkts[i]);
+		pkts[i] = NULL;
+	}
+}
+
+/**
+ * Interface to burst rx and enqueue mbufs into rx_q
+ */
+static void
+kni_ingress(struct kni_port_params *p)
+{
+	uint8_t i, port_id;
+	unsigned nb_rx, num;
+	uint32_t nb_kni;
+	struct rte_mbuf *pkts_burst[PKT_BURST_SZ];
+
+	if (p == NULL)
+		return;
+
+	nb_kni = p->nb_kni;
+	port_id = p->port_id;
+	for (i = 0; i < nb_kni; i++) {
+		/* Burst rx from eth */
+		nb_rx = rte_eth_rx_burst(port_id, 0, pkts_burst, PKT_BURST_SZ);
+		if (unlikely(nb_rx > PKT_BURST_SZ)) {
+			RTE_LOG(ERR, APP, "Error receiving from eth\n");
+			return;
+		}
+		/* Burst tx to kni */
+		num = rte_kni_tx_burst(p->kni[i], pkts_burst, nb_rx);
+		kni_stats[port_id].rx_packets += num;
+
+		rte_kni_handle_request(p->kni[i]);
+		if (unlikely(num < nb_rx)) {
+			/* Free mbufs not tx to kni interface */
+			kni_burst_free_mbufs(&pkts_burst[num], nb_rx - num);
+			kni_stats[port_id].rx_dropped += nb_rx - num;
+		}
+	}
+}
+
+/**
+ * Interface to dequeue mbufs from tx_q and burst tx
+ */
+static void
+kni_egress(struct kni_port_params *p)
+{
+	uint8_t i, port_id;
+	unsigned nb_tx, num;
+	uint32_t nb_kni;
+	struct rte_mbuf *pkts_burst[PKT_BURST_SZ];
+
+	if (p == NULL)
+		return;
+
+	nb_kni = p->nb_kni;
+	port_id = p->port_id;
+	for (i = 0; i < nb_kni; i++) {
+		/* Burst rx from kni */
+		num = rte_kni_rx_burst(p->kni[i], pkts_burst, PKT_BURST_SZ);
+		if (unlikely(num > PKT_BURST_SZ)) {
+			RTE_LOG(ERR, APP, "Error receiving from KNI\n");
+			return;
+		}
+		/* Burst tx to eth */
+		nb_tx = rte_eth_tx_burst(port_id, 0, pkts_burst, (uint16_t)num);
+		kni_stats[port_id].tx_packets += nb_tx;
+		if (unlikely(nb_tx < num)) {
+			/* Free mbufs not tx to NIC */
+			kni_burst_free_mbufs(&pkts_burst[nb_tx], num - nb_tx);
+			kni_stats[port_id].tx_dropped += num - nb_tx;
+		}
+	}
+}
+
+static int
+main_loop(__rte_unused void *arg)
+{
+	uint8_t i, nb_ports = rte_eth_dev_count();
+	int32_t f_stop;
+	const unsigned lcore_id = rte_lcore_id();
+	enum lcore_rxtx {
+		LCORE_NONE,
+		LCORE_RX,
+		LCORE_TX,
+		LCORE_MAX
+	};
+	enum lcore_rxtx flag = LCORE_NONE;
+
+	nb_ports = (uint8_t)(nb_ports < RTE_MAX_ETHPORTS ?
+				nb_ports : RTE_MAX_ETHPORTS);
+	for (i = 0; i < nb_ports; i++) {
+		if (!kni_port_params_array[i])
+			continue;
+		if (kni_port_params_array[i]->lcore_rx == (uint8_t)lcore_id) {
+			flag = LCORE_RX;
+			break;
+		} else if (kni_port_params_array[i]->lcore_tx ==
+						(uint8_t)lcore_id) {
+			flag = LCORE_TX;
+			break;
+		}
+	}
+
+	if (flag == LCORE_RX) {
+		RTE_LOG(INFO, APP, "Lcore %u is reading from port %d\n",
+					kni_port_params_array[i]->lcore_rx,
+					kni_port_params_array[i]->port_id);
+		while (1) {
+			f_stop = rte_atomic32_read(&kni_stop);
+			if (f_stop)
+				break;
+			kni_ingress(kni_port_params_array[i]);
+		}
+	} else if (flag == LCORE_TX) {
+		RTE_LOG(INFO, APP, "Lcore %u is writing to port %d\n",
+					kni_port_params_array[i]->lcore_tx,
+					kni_port_params_array[i]->port_id);
+		while (1) {
+			f_stop = rte_atomic32_read(&kni_stop);
+			if (f_stop)
+				break;
+			kni_egress(kni_port_params_array[i]);
+		}
+	} else
+		RTE_LOG(INFO, APP, "Lcore %u has nothing to do\n", lcore_id);
+
+	return 0;
+}
+
+/* Display usage instructions */
+static void
+print_usage(const char *prgname)
+{
+	RTE_LOG(INFO, APP, "\nUsage: %s [EAL options] -- -p PORTMASK -P "
+		   "[--config (port,lcore_rx,lcore_tx,lcore_kthread...)"
+		   "[,(port,lcore_rx,lcore_tx,lcore_kthread...)]]\n"
+		   "    -p PORTMASK: hex bitmask of ports to use\n"
+		   "    -P : enable promiscuous mode\n"
+		   "    --config (port,lcore_rx,lcore_tx,lcore_kthread...): "
+		   "port and lcore configurations\n",
+	           prgname);
+}
+
+/* Convert string to unsigned number. 0 is returned if error occurs */
+static uint32_t
+parse_unsigned(const char *portmask)
+{
+	char *end = NULL;
+	unsigned long num;
+
+	num = strtoul(portmask, &end, 16);
+	if ((portmask[0] == '\0') || (end == NULL) || (*end != '\0'))
+		return 0;
+
+	return (uint32_t)num;
+}
+
+static void
+print_config(void)
+{
+	uint32_t i, j;
+	struct kni_port_params **p = kni_port_params_array;
+
+	for (i = 0; i < RTE_MAX_ETHPORTS; i++) {
+		if (!p[i])
+			continue;
+		RTE_LOG(DEBUG, APP, "Port ID: %d\n", p[i]->port_id);
+		RTE_LOG(DEBUG, APP, "Rx lcore ID: %u, Tx lcore ID: %u\n",
+					p[i]->lcore_rx, p[i]->lcore_tx);
+		for (j = 0; j < p[i]->nb_lcore_k; j++)
+			RTE_LOG(DEBUG, APP, "Kernel thread lcore ID: %u\n",
+							p[i]->lcore_k[j]);
+	}
+}
+
+static int
+parse_config(const char *arg)
+{
+	const char *p, *p0 = arg;
+	char s[256], *end;
+	unsigned size;
+	enum fieldnames {
+		FLD_PORT = 0,
+		FLD_LCORE_RX,
+		FLD_LCORE_TX,
+		_NUM_FLD = KNI_MAX_KTHREAD + 3,
+	};
+	int i, j, nb_token;
+	char *str_fld[_NUM_FLD];
+	unsigned long int_fld[_NUM_FLD];
+	uint8_t port_id, nb_kni_port_params = 0;
+
+	memset(&kni_port_params_array, 0, sizeof(kni_port_params_array));
+	while (((p = strchr(p0, '(')) != NULL) &&
+		nb_kni_port_params < RTE_MAX_ETHPORTS) {
+		p++;
+		if ((p0 = strchr(p, ')')) == NULL)
+			goto fail;
+		size = p0 - p;
+		if (size >= sizeof(s)) {
+			printf("Invalid config parameters\n");
+			goto fail;
+		}
+		snprintf(s, sizeof(s), "%.*s", size, p);
+		nb_token = rte_strsplit(s, sizeof(s), str_fld, _NUM_FLD, ',');
+		if (nb_token <= FLD_LCORE_TX) {
+			printf("Invalid config parameters\n");
+			goto fail;
+		}
+		for (i = 0; i < nb_token; i++) {
+			errno = 0;
+			int_fld[i] = strtoul(str_fld[i], &end, 0);
+			if (errno != 0 || end == str_fld[i]) {
+				printf("Invalid config parameters\n");
+				goto fail;
+			}
+		}
+
+		i = 0;
+		port_id = (uint8_t)int_fld[i++];
+		if (port_id >= RTE_MAX_ETHPORTS) {
+			printf("Port ID %d could not exceed the maximum %d\n",
+						port_id, RTE_MAX_ETHPORTS);
+			goto fail;
+		}
+		if (kni_port_params_array[port_id]) {
+			printf("Port %d has been configured\n", port_id);
+			goto fail;
+		}
+		kni_port_params_array[port_id] =
+			rte_zmalloc("KNI_port_params",
+				    sizeof(struct kni_port_params), RTE_CACHE_LINE_SIZE);
+		kni_port_params_array[port_id]->port_id = port_id;
+		kni_port_params_array[port_id]->lcore_rx =
+					(uint8_t)int_fld[i++];
+		kni_port_params_array[port_id]->lcore_tx =
+					(uint8_t)int_fld[i++];
+		if (kni_port_params_array[port_id]->lcore_rx >= RTE_MAX_LCORE ||
+		kni_port_params_array[port_id]->lcore_tx >= RTE_MAX_LCORE) {
+			printf("lcore_rx %u or lcore_tx %u ID could not "
+						"exceed the maximum %u\n",
+				kni_port_params_array[port_id]->lcore_rx,
+				kni_port_params_array[port_id]->lcore_tx,
+						(unsigned)RTE_MAX_LCORE);
+			goto fail;
+		}
+		for (j = 0; i < nb_token && j < KNI_MAX_KTHREAD; i++, j++)
+			kni_port_params_array[port_id]->lcore_k[j] =
+						(uint8_t)int_fld[i];
+		kni_port_params_array[port_id]->nb_lcore_k = j;
+	}
+	print_config();
+
+	return 0;
+
+fail:
+	for (i = 0; i < RTE_MAX_ETHPORTS; i++) {
+		if (kni_port_params_array[i]) {
+			rte_free(kni_port_params_array[i]);
+			kni_port_params_array[i] = NULL;
+		}
+	}
+
+	return -1;
+}
+
+static int
+validate_parameters(uint32_t portmask)
+{
+	uint32_t i;
+
+	if (!portmask) {
+		printf("No port configured in port mask\n");
+		return -1;
+	}
+
+	for (i = 0; i < RTE_MAX_ETHPORTS; i++) {
+		if (((portmask & (1 << i)) && !kni_port_params_array[i]) ||
+			(!(portmask & (1 << i)) && kni_port_params_array[i]))
+			rte_exit(EXIT_FAILURE, "portmask is not consistent "
+				"to port ids specified in --config\n");
+
+		if (kni_port_params_array[i] && !rte_lcore_is_enabled(\
+			(unsigned)(kni_port_params_array[i]->lcore_rx)))
+			rte_exit(EXIT_FAILURE, "lcore id %u for "
+					"port %d receiving not enabled\n",
+					kni_port_params_array[i]->lcore_rx,
+					kni_port_params_array[i]->port_id);
+
+		if (kni_port_params_array[i] && !rte_lcore_is_enabled(\
+			(unsigned)(kni_port_params_array[i]->lcore_tx)))
+			rte_exit(EXIT_FAILURE, "lcore id %u for "
+					"port %d transmitting not enabled\n",
+					kni_port_params_array[i]->lcore_tx,
+					kni_port_params_array[i]->port_id);
+
+	}
+
+	return 0;
+}
+
+#define CMDLINE_OPT_CONFIG  "config"
+
+/* Parse the arguments given in the command line of the application */
+static int
+parse_args(int argc, char **argv)
+{
+	int opt, longindex, ret = 0;
+	const char *prgname = argv[0];
+	static struct option longopts[] = {
+		{CMDLINE_OPT_CONFIG, required_argument, NULL, 0},
+		{NULL, 0, NULL, 0}
+	};
+
+	/* Disable printing messages within getopt() */
+	opterr = 0;
+
+	/* Parse command line */
+	while ((opt = getopt_long(argc, argv, "p:P", longopts,
+						&longindex)) != EOF) {
+		switch (opt) {
+		case 'p':
+			ports_mask = parse_unsigned(optarg);
+			break;
+		case 'P':
+			promiscuous_on = 1;
+			break;
+		case 0:
+			if (!strncmp(longopts[longindex].name,
+				     CMDLINE_OPT_CONFIG,
+				     sizeof(CMDLINE_OPT_CONFIG))) {
+				ret = parse_config(optarg);
+				if (ret) {
+					printf("Invalid config\n");
+					print_usage(prgname);
+					return -1;
+				}
+			}
+			break;
+		default:
+			print_usage(prgname);
+			rte_exit(EXIT_FAILURE, "Invalid option specified\n");
+		}
+	}
+
+	/* Check that options were parsed ok */
+	if (validate_parameters(ports_mask) < 0) {
+		print_usage(prgname);
+		rte_exit(EXIT_FAILURE, "Invalid parameters\n");
+	}
+
+	return ret;
+}
+
+/* Initialize KNI subsystem */
+static void
+init_kni(void)
+{
+	unsigned int num_of_kni_ports = 0, i;
+	struct kni_port_params **params = kni_port_params_array;
+
+	/* Calculate the maximum number of KNI interfaces that will be used */
+	for (i = 0; i < RTE_MAX_ETHPORTS; i++) {
+		if (kni_port_params_array[i]) {
+			num_of_kni_ports += (params[i]->nb_lcore_k ?
+				params[i]->nb_lcore_k : 1);
+		}
+	}
+
+	/* Invoke rte KNI init to preallocate the ports */
+	rte_kni_init(num_of_kni_ports);
+}
+
+/* Initialise a single port on an Ethernet device */
+static void
+init_port(uint8_t port)
+{
+	int ret;
+
+	/* Initialise device and RX/TX queues */
+	RTE_LOG(INFO, APP, "Initialising port %u ...\n", (unsigned)port);
+	fflush(stdout);
+	ret = rte_eth_dev_configure(port, 1, 1, &port_conf);
+	if (ret < 0)
+		rte_exit(EXIT_FAILURE, "Could not configure port%u (%d)\n",
+		            (unsigned)port, ret);
+
+	ret = rte_eth_rx_queue_setup(port, 0, NB_RXD,
+		rte_eth_dev_socket_id(port), NULL, pktmbuf_pool);
+	if (ret < 0)
+		rte_exit(EXIT_FAILURE, "Could not setup up RX queue for "
+				"port%u (%d)\n", (unsigned)port, ret);
+
+	ret = rte_eth_tx_queue_setup(port, 0, NB_TXD,
+		rte_eth_dev_socket_id(port), NULL);
+	if (ret < 0)
+		rte_exit(EXIT_FAILURE, "Could not setup up TX queue for "
+				"port%u (%d)\n", (unsigned)port, ret);
+
+	ret = rte_eth_dev_start(port);
+	if (ret < 0)
+		rte_exit(EXIT_FAILURE, "Could not start port%u (%d)\n",
+						(unsigned)port, ret);
+
+	if (promiscuous_on)
+		rte_eth_promiscuous_enable(port);
+}
+
+/* Check the link status of all ports in up to 9s, and print them finally */
+static void
+check_all_ports_link_status(uint8_t port_num, uint32_t port_mask)
+{
+#define CHECK_INTERVAL 100 /* 100ms */
+#define MAX_CHECK_TIME 90 /* 9s (90 * 100ms) in total */
+	uint8_t portid, count, all_ports_up, print_flag = 0;
+	struct rte_eth_link link;
+
+	printf("\nChecking link status\n");
+	fflush(stdout);
+	for (count = 0; count <= MAX_CHECK_TIME; count++) {
+		all_ports_up = 1;
+		for (portid = 0; portid < port_num; portid++) {
+			if ((port_mask & (1 << portid)) == 0)
+				continue;
+			memset(&link, 0, sizeof(link));
+			rte_eth_link_get_nowait(portid, &link);
+			/* print link status if flag set */
+			if (print_flag == 1) {
+				if (link.link_status)
+					printf("Port %d Link Up - speed %u "
+						"Mbps - %s\n", (uint8_t)portid,
+						(unsigned)link.link_speed,
+				(link.link_duplex == ETH_LINK_FULL_DUPLEX) ?
+					("full-duplex") : ("half-duplex\n"));
+				else
+					printf("Port %d Link Down\n",
+						(uint8_t)portid);
+				continue;
+			}
+			/* clear all_ports_up flag if any link down */
+			if (link.link_status == ETH_LINK_DOWN) {
+				all_ports_up = 0;
+				break;
+			}
+		}
+		/* after finally printing all link status, get out */
+		if (print_flag == 1)
+			break;
+
+		if (all_ports_up == 0) {
+			printf(".");
+			fflush(stdout);
+			rte_delay_ms(CHECK_INTERVAL);
+		}
+
+		/* set the print_flag if all ports up or timeout */
+		if (all_ports_up == 1 || count == (MAX_CHECK_TIME - 1)) {
+			print_flag = 1;
+			printf("done\n");
+		}
+	}
+}
+
+/* Callback for request of changing MTU */
+static int
+kni_change_mtu(uint8_t port_id, unsigned new_mtu)
+{
+	int ret;
+	struct rte_eth_conf conf;
+
+	if (port_id >= rte_eth_dev_count()) {
+		RTE_LOG(ERR, APP, "Invalid port id %d\n", port_id);
+		return -EINVAL;
+	}
+
+	RTE_LOG(INFO, APP, "Change MTU of port %d to %u\n", port_id, new_mtu);
+
+	/* Stop specific port */
+	rte_eth_dev_stop(port_id);
+
+	memcpy(&conf, &port_conf, sizeof(conf));
+	/* Set new MTU */
+	if (new_mtu > ETHER_MAX_LEN)
+		conf.rxmode.jumbo_frame = 1;
+	else
+		conf.rxmode.jumbo_frame = 0;
+
+	/* mtu + length of header + length of FCS = max pkt length */
+	conf.rxmode.max_rx_pkt_len = new_mtu + KNI_ENET_HEADER_SIZE +
+							KNI_ENET_FCS_SIZE;
+	ret = rte_eth_dev_configure(port_id, 1, 1, &conf);
+	if (ret < 0) {
+		RTE_LOG(ERR, APP, "Fail to reconfigure port %d\n", port_id);
+		return ret;
+	}
+
+	/* Restart specific port */
+	ret = rte_eth_dev_start(port_id);
+	if (ret < 0) {
+		RTE_LOG(ERR, APP, "Fail to restart port %d\n", port_id);
+		return ret;
+	}
+
+	return 0;
+}
+
+/* Callback for request of configuring network interface up/down */
+static int
+kni_config_network_interface(uint8_t port_id, uint8_t if_up)
+{
+	int ret = 0;
+
+	if (port_id >= rte_eth_dev_count() || port_id >= RTE_MAX_ETHPORTS) {
+		RTE_LOG(ERR, APP, "Invalid port id %d\n", port_id);
+		return -EINVAL;
+	}
+
+	RTE_LOG(INFO, APP, "Configure network interface of %d %s\n",
+					port_id, if_up ? "up" : "down");
+
+	if (if_up != 0) { /* Configure network interface up */
+		rte_eth_dev_stop(port_id);
+		ret = rte_eth_dev_start(port_id);
+	} else /* Configure network interface down */
+		rte_eth_dev_stop(port_id);
+
+	if (ret < 0)
+		RTE_LOG(ERR, APP, "Failed to start port %d\n", port_id);
+
+	return ret;
+}
+
+static int
+kni_alloc(uint8_t port_id)
+{
+	uint8_t i;
+	struct rte_kni *kni;
+	struct rte_kni_conf conf;
+	struct kni_port_params **params = kni_port_params_array;
+
+	if (port_id >= RTE_MAX_ETHPORTS || !params[port_id])
+		return -1;
+
+	params[port_id]->nb_kni = params[port_id]->nb_lcore_k ?
+				params[port_id]->nb_lcore_k : 1;
+
+	for (i = 0; i < params[port_id]->nb_kni; i++) {
+		/* Clear conf at first */
+		memset(&conf, 0, sizeof(conf));
+		if (params[port_id]->nb_lcore_k) {
+			snprintf(conf.name, RTE_KNI_NAMESIZE,
+					"vEth%u_%u", port_id, i);
+			conf.core_id = params[port_id]->lcore_k[i];
+			conf.force_bind = 1;
+		} else
+			snprintf(conf.name, RTE_KNI_NAMESIZE,
+						"vEth%u", port_id);
+		conf.group_id = (uint16_t)port_id;
+		conf.mbuf_size = MAX_PACKET_SZ;
+		/*
+		 * The first KNI device associated to a port
+		 * is the master, for multiple kernel thread
+		 * environment.
+		 */
+		if (i == 0) {
+			struct rte_kni_ops ops;
+			struct rte_eth_dev_info dev_info;
+
+			memset(&dev_info, 0, sizeof(dev_info));
+			rte_eth_dev_info_get(port_id, &dev_info);
+			conf.addr = dev_info.pci_dev->addr;
+			conf.id = dev_info.pci_dev->id;
+
+			memset(&ops, 0, sizeof(ops));
+			ops.port_id = port_id;
+			ops.change_mtu = kni_change_mtu;
+			ops.config_network_if = kni_config_network_interface;
+
+			kni = rte_kni_alloc(pktmbuf_pool, &conf, &ops);
+		} else
+			kni = rte_kni_alloc(pktmbuf_pool, &conf, NULL);
+
+		if (!kni)
+			rte_exit(EXIT_FAILURE, "Fail to create kni for "
+						"port: %d\n", port_id);
+		params[port_id]->kni[i] = kni;
+	}
+
+	return 0;
+}
+
+static int
+kni_free_kni(uint8_t port_id)
+{
+	uint8_t i;
+	struct kni_port_params **p = kni_port_params_array;
+
+	if (port_id >= RTE_MAX_ETHPORTS || !p[port_id])
+		return -1;
+
+	for (i = 0; i < p[port_id]->nb_kni; i++) {
+		rte_kni_release(p[port_id]->kni[i]);
+		p[port_id]->kni[i] = NULL;
+	}
+	rte_eth_dev_stop(port_id);
+
+	return 0;
+}
+
+/* Initialise ports/queues etc. and start main loop on each core */
+int
+main(int argc, char** argv)
+{
+	int ret;
+	uint8_t nb_sys_ports, port;
+	unsigned i;
+
+	/* Associate signal_hanlder function with USR signals */
+	signal(SIGUSR1, signal_handler);
+	signal(SIGUSR2, signal_handler);
+	signal(SIGRTMIN, signal_handler);
+	signal(SIGINT, signal_handler);
+
+	/* Initialise EAL */
+	ret = rte_eal_init(argc, argv);
+	if (ret < 0)
+		rte_exit(EXIT_FAILURE, "Could not initialise EAL (%d)\n", ret);
+	argc -= ret;
+	argv += ret;
+
+	/* Parse application arguments (after the EAL ones) */
+	ret = parse_args(argc, argv);
+	if (ret < 0)
+		rte_exit(EXIT_FAILURE, "Could not parse input parameters\n");
+
+	/* Create the mbuf pool */
+	pktmbuf_pool = rte_pktmbuf_pool_create("mbuf_pool", NB_MBUF,
+		MEMPOOL_CACHE_SZ, 0, MBUF_DATA_SZ, rte_socket_id());
+	if (pktmbuf_pool == NULL) {
+		rte_exit(EXIT_FAILURE, "Could not initialise mbuf pool\n");
+		return -1;
+	}
+
+	/* Get number of ports found in scan */
+	nb_sys_ports = rte_eth_dev_count();
+	if (nb_sys_ports == 0)
+		rte_exit(EXIT_FAILURE, "No supported Ethernet device found\n");
+
+	/* Check if the configured port ID is valid */
+	for (i = 0; i < RTE_MAX_ETHPORTS; i++)
+		if (kni_port_params_array[i] && i >= nb_sys_ports)
+			rte_exit(EXIT_FAILURE, "Configured invalid "
+						"port ID %u\n", i);
+
+	/* Initialize KNI subsystem */
+	init_kni();
+
+	/* Initialise each port */
+	for (port = 0; port < nb_sys_ports; port++) {
+		/* Skip ports that are not enabled */
+		if (!(ports_mask & (1 << port)))
+			continue;
+		init_port(port);
+
+		if (port >= RTE_MAX_ETHPORTS)
+			rte_exit(EXIT_FAILURE, "Can not use more than "
+				"%d ports for kni\n", RTE_MAX_ETHPORTS);
+
+		kni_alloc(port);
+	}
+	check_all_ports_link_status(nb_sys_ports, ports_mask);
+
+	/* Launch per-lcore function on every lcore */
+	rte_eal_mp_remote_launch(main_loop, NULL, CALL_MASTER);
+	RTE_LCORE_FOREACH_SLAVE(i) {
+		if (rte_eal_wait_lcore(i) < 0)
+			return -1;
+	}
+
+	/* Release resources */
+	for (port = 0; port < nb_sys_ports; port++) {
+		if (!(ports_mask & (1 << port)))
+			continue;
+		kni_free_kni(port);
+	}
+#ifdef RTE_LIBRTE_XEN_DOM0
+	rte_kni_close();
+#endif
+	for (i = 0; i < RTE_MAX_ETHPORTS; i++)
+		if (kni_port_params_array[i]) {
+			rte_free(kni_port_params_array[i]);
+			kni_port_params_array[i] = NULL;
+		}
+
+	return 0;
+}