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/*-
 *   BSD LICENSE
 *
 *   Copyright 2017 Mellanox.
 *
 *   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 Mellanox. 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 <string.h>
#include <stdint.h>
#include <inttypes.h>
#include <sys/types.h>
#include <sys/queue.h>
#include <netinet/in.h>
#include <setjmp.h>
#include <stdarg.h>
#include <ctype.h>
#include <errno.h>
#include <getopt.h>
#include <signal.h>
#include <stdbool.h>

#include <rte_eal.h>
#include <rte_common.h>
#include <rte_malloc.h>
#include <rte_ether.h>
#include <rte_ethdev.h>
#include <rte_mempool.h>
#include <rte_mbuf.h>
#include <rte_net.h>
#include <rte_flow.h>

static volatile bool force_quit;

static uint8_t port_id;
static uint16_t nr_queues = 5;
static uint8_t selected_queue = 1;
struct rte_mempool *mbuf_pool;
struct rte_flow *flow;

#define SRC_IP ((0<<24) + (0<<16) + (0<<8) + 0) /* src ip = 0.0.0.0 */
#define DEST_IP ((192<<24) + (168<<16) + (1<<8) + 1) /* dest ip = 192.168.1.1 */
#define FULL_MASK 0xffffffff /* full mask */
#define EMPTY_MASK 0x0 /* empty mask */

#include "flow_blocks.c"

static inline void
print_ether_addr(const char *what, struct ether_addr *eth_addr)
{
	char buf[ETHER_ADDR_FMT_SIZE];
	ether_format_addr(buf, ETHER_ADDR_FMT_SIZE, eth_addr);
	printf("%s%s", what, buf);
}

static void
main_loop(void)
{
	struct rte_mbuf *mbufs[32];
	struct ether_hdr *eth_hdr;
	struct rte_flow_error error;
	uint16_t nb_rx;
	uint16_t i;
	uint16_t j;

	while (!force_quit) {
		for (i = 0; i < nr_queues; i++) {
			nb_rx = rte_eth_rx_burst(port_id,
						i, mbufs, 32);
			if (nb_rx) {
				for (j = 0; j < nb_rx; j++) {
					struct rte_mbuf *m = mbufs[j];

					eth_hdr = rte_pktmbuf_mtod(m,
							struct ether_hdr *);
					print_ether_addr("src=",
							&eth_hdr->s_addr);
					print_ether_addr(" - dst=",
							&eth_hdr->d_addr);
					printf(" - queue=0x%x",
							(unsigned int)i);
					printf("\n");

					rte_pktmbuf_free(m);
				}
			}
		}
	}

	/* closing and releasing resources */
	rte_flow_flush(port_id, &error);
	rte_eth_dev_stop(port_id);
	rte_eth_dev_close(port_id);
}

static void
assert_link_status(void)
{
	struct rte_eth_link link;

	memset(&link, 0, sizeof(link));
	rte_eth_link_get(port_id, &link);
	if (link.link_status == ETH_LINK_DOWN)
		rte_exit(EXIT_FAILURE, ":: error: link is still down\n");
}

static void
init_port(void)
{
	int ret;
	uint16_t i;
	struct rte_eth_conf port_conf = {
		.rxmode = {
			.split_hdr_size = 0,
			/**< Header Split disabled */
			.header_split   = 0,
			/**< IP checksum offload disabled */
			.hw_ip_checksum = 0,
			/**< VLAN filtering disabled */
			.hw_vlan_filter = 0,
			/**< Jumbo Frame Support disabled */
			.jumbo_frame    = 0,
			/**< CRC stripped by hardware */
			.hw_strip_crc   = 1,
		},
	};

	printf(":: initializing port: %d\n", port_id);
	ret = rte_eth_dev_configure(port_id,
				nr_queues, nr_queues, &port_conf);
	if (ret < 0) {
		rte_exit(EXIT_FAILURE,
			":: cannot configure device: err=%d, port=%u\n",
			ret, port_id);
	}

	/* only set Rx queues: something we care only so far */
	for (i = 0; i < nr_queues; i++) {
		ret = rte_eth_rx_queue_setup(port_id, i, 512,
				     rte_eth_dev_socket_id(port_id),
				     NULL,
				     mbuf_pool);
		if (ret < 0) {
			rte_exit(EXIT_FAILURE,
				":: Rx queue setup failed: err=%d, port=%u\n",
				ret, port_id);
		}
	}

	rte_eth_promiscuous_enable(port_id);
	ret = rte_eth_dev_start(port_id);
	if (ret < 0) {
		rte_exit(EXIT_FAILURE,
			"rte_eth_dev_start:err=%d, port=%u\n",
			ret, port_id);
	}

	assert_link_status();

	printf(":: initializing port: %d done\n", port_id);
}

static void
signal_handler(int signum)
{
	if (signum == SIGINT || signum == SIGTERM) {
		printf("\n\nSignal %d received, preparing to exit...\n",
				signum);
		force_quit = true;
	}
}

int
main(int argc, char **argv)
{
	int ret;
	uint8_t nr_ports;
	struct rte_flow_error error;

	ret = rte_eal_init(argc, argv);
	if (ret < 0)
		rte_exit(EXIT_FAILURE, ":: invalid EAL arguments\n");

	force_quit = false;
	signal(SIGINT, signal_handler);
	signal(SIGTERM, signal_handler);

	nr_ports = rte_eth_dev_count();
	if (nr_ports == 0)
		rte_exit(EXIT_FAILURE, ":: no Ethernet ports found\n");
	port_id = 0;
	if (nr_ports != 1) {
		printf(":: warn: %d ports detected, but we use only one: port %u\n",
			nr_ports, port_id);
	}
	mbuf_pool = rte_pktmbuf_pool_create("mbuf_pool", 4096, 128, 0,
					    RTE_MBUF_DEFAULT_BUF_SIZE,
					    rte_socket_id());
	if (mbuf_pool == NULL)
		rte_exit(EXIT_FAILURE, "Cannot init mbuf pool\n");

	init_port();

	/* create flow for send packet with */
	flow = generate_ipv4_flow(port_id, selected_queue,
				SRC_IP, EMPTY_MASK,
				DEST_IP, FULL_MASK, &error);
	if (!flow) {
		printf("Flow can't be created %d message: %s\n",
			error.type,
			error.message ? error.message : "(no stated reason)");
		rte_exit(EXIT_FAILURE, "error in creating flow");
	}

	main_loop();

	return 0;
}