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/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2010-2016 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 <sys/types.h>
#include <string.h>
#include <sys/queue.h>
#include <stdarg.h>
#include <errno.h>
#include <getopt.h>
#include <stdbool.h>

#include <rte_debug.h>
#include <rte_ether.h>
#include <rte_ethdev.h>
#include <rte_mempool.h>
#include <rte_cycles.h>
#include <rte_mbuf.h>
#include <rte_ip.h>
#include <rte_tcp.h>
#include <rte_udp.h>
#include <rte_lpm.h>
#include <rte_lpm6.h>

#include "l3fwd.h"

struct ipv4_l3fwd_lpm_route {
	uint32_t ip;
	uint8_t  depth;
	uint8_t  if_out;
};

struct ipv6_l3fwd_lpm_route {
	uint8_t ip[16];
	uint8_t  depth;
	uint8_t  if_out;
};

static struct ipv4_l3fwd_lpm_route ipv4_l3fwd_lpm_route_array[] = {
	{IPv4(1, 1, 1, 0), 24, 0},
	{IPv4(2, 1, 1, 0), 24, 1},
	{IPv4(3, 1, 1, 0), 24, 2},
	{IPv4(4, 1, 1, 0), 24, 3},
	{IPv4(5, 1, 1, 0), 24, 4},
	{IPv4(6, 1, 1, 0), 24, 5},
	{IPv4(7, 1, 1, 0), 24, 6},
	{IPv4(8, 1, 1, 0), 24, 7},
};

static struct ipv6_l3fwd_lpm_route ipv6_l3fwd_lpm_route_array[] = {
	{{1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, 48, 0},
	{{2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, 48, 1},
	{{3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, 48, 2},
	{{4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, 48, 3},
	{{5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, 48, 4},
	{{6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, 48, 5},
	{{7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, 48, 6},
	{{8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, 48, 7},
};

#define IPV4_L3FWD_LPM_NUM_ROUTES \
	(sizeof(ipv4_l3fwd_lpm_route_array) / sizeof(ipv4_l3fwd_lpm_route_array[0]))
#define IPV6_L3FWD_LPM_NUM_ROUTES \
	(sizeof(ipv6_l3fwd_lpm_route_array) / sizeof(ipv6_l3fwd_lpm_route_array[0]))

#define IPV4_L3FWD_LPM_MAX_RULES         1024
#define IPV4_L3FWD_LPM_NUMBER_TBL8S (1 << 8)
#define IPV6_L3FWD_LPM_MAX_RULES         1024
#define IPV6_L3FWD_LPM_NUMBER_TBL8S (1 << 16)

struct rte_lpm *ipv4_l3fwd_lpm_lookup_struct[NB_SOCKETS];
struct rte_lpm6 *ipv6_l3fwd_lpm_lookup_struct[NB_SOCKETS];

#if defined(__SSE4_1__)
#include "l3fwd_lpm_sse.h"
#else
#include "l3fwd_lpm.h"
#endif

/* main processing loop */
int
lpm_main_loop(__attribute__((unused)) void *dummy)
{
	struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
	unsigned lcore_id;
	uint64_t prev_tsc, diff_tsc, cur_tsc;
	int i, nb_rx;
	uint8_t portid, queueid;
	struct lcore_conf *qconf;
	const uint64_t drain_tsc = (rte_get_tsc_hz() + US_PER_S - 1) /
		US_PER_S * BURST_TX_DRAIN_US;

	prev_tsc = 0;

	lcore_id = rte_lcore_id();
	qconf = &lcore_conf[lcore_id];

	if (qconf->n_rx_queue == 0) {
		RTE_LOG(INFO, L3FWD, "lcore %u has nothing to do\n", lcore_id);
		return 0;
	}

	RTE_LOG(INFO, L3FWD, "entering main loop on lcore %u\n", lcore_id);

	for (i = 0; i < qconf->n_rx_queue; i++) {

		portid = qconf->rx_queue_list[i].port_id;
		queueid = qconf->rx_queue_list[i].queue_id;
		RTE_LOG(INFO, L3FWD,
			" -- lcoreid=%u portid=%hhu rxqueueid=%hhu\n",
			lcore_id, portid, queueid);
	}

	while (!force_quit) {

		cur_tsc = rte_rdtsc();

		/*
		 * TX burst queue drain
		 */
		diff_tsc = cur_tsc - prev_tsc;
		if (unlikely(diff_tsc > drain_tsc)) {

			for (i = 0; i < qconf->n_tx_port; ++i) {
				portid = qconf->tx_port_id[i];
				if (qconf->tx_mbufs[portid].len == 0)
					continue;
				send_burst(qconf,
					qconf->tx_mbufs[portid].len,
					portid);
				qconf->tx_mbufs[portid].len = 0;
			}

			prev_tsc = cur_tsc;
		}

		/*
		 * Read packet from RX queues
		 */
		for (i = 0; i < qconf->n_rx_queue; ++i) {
			portid = qconf->rx_queue_list[i].port_id;
			queueid = qconf->rx_queue_list[i].queue_id;
			nb_rx = rte_eth_rx_burst(portid, queueid, pkts_burst,
				MAX_PKT_BURST);
			if (nb_rx == 0)
				continue;

#if defined(__SSE4_1__)
			l3fwd_lpm_send_packets(nb_rx, pkts_burst,
						portid, qconf);
#else
			l3fwd_lpm_no_opt_send_packets(nb_rx, pkts_burst,
							portid, qconf);
#endif /* __SSE_4_1__ */
		}
	}

	return 0;
}

void
setup_lpm(const int socketid)
{
	struct rte_lpm6_config config;
	struct rte_lpm_config config_ipv4;
	unsigned i;
	int ret;
	char s[64];

	/* create the LPM table */
	config_ipv4.max_rules = IPV4_L3FWD_LPM_MAX_RULES;
	config_ipv4.number_tbl8s = IPV4_L3FWD_LPM_NUMBER_TBL8S;
	config_ipv4.flags = 0;
	snprintf(s, sizeof(s), "IPV4_L3FWD_LPM_%d", socketid);
	ipv4_l3fwd_lpm_lookup_struct[socketid] =
			rte_lpm_create(s, socketid, &config_ipv4);
	if (ipv4_l3fwd_lpm_lookup_struct[socketid] == NULL)
		rte_exit(EXIT_FAILURE,
			"Unable to create the l3fwd LPM table on socket %d\n",
			socketid);

	/* populate the LPM table */
	for (i = 0; i < IPV4_L3FWD_LPM_NUM_ROUTES; i++) {

		/* skip unused ports */
		if ((1 << ipv4_l3fwd_lpm_route_array[i].if_out &
				enabled_port_mask) == 0)
			continue;

		ret = rte_lpm_add(ipv4_l3fwd_lpm_lookup_struct[socketid],
			ipv4_l3fwd_lpm_route_array[i].ip,
			ipv4_l3fwd_lpm_route_array[i].depth,
			ipv4_l3fwd_lpm_route_array[i].if_out);

		if (ret < 0) {
			rte_exit(EXIT_FAILURE,
				"Unable to add entry %u to the l3fwd LPM table on socket %d\n",
				i, socketid);
		}

		printf("LPM: Adding route 0x%08x / %d (%d)\n",
			(unsigned)ipv4_l3fwd_lpm_route_array[i].ip,
			ipv4_l3fwd_lpm_route_array[i].depth,
			ipv4_l3fwd_lpm_route_array[i].if_out);
	}

	/* create the LPM6 table */
	snprintf(s, sizeof(s), "IPV6_L3FWD_LPM_%d", socketid);

	config.max_rules = IPV6_L3FWD_LPM_MAX_RULES;
	config.number_tbl8s = IPV6_L3FWD_LPM_NUMBER_TBL8S;
	config.flags = 0;
	ipv6_l3fwd_lpm_lookup_struct[socketid] = rte_lpm6_create(s, socketid,
				&config);
	if (ipv6_l3fwd_lpm_lookup_struct[socketid] == NULL)
		rte_exit(EXIT_FAILURE,
			"Unable to create the l3fwd LPM table on socket %d\n",
			socketid);

	/* populate the LPM table */
	for (i = 0; i < IPV6_L3FWD_LPM_NUM_ROUTES; i++) {

		/* skip unused ports */
		if ((1 << ipv6_l3fwd_lpm_route_array[i].if_out &
				enabled_port_mask) == 0)
			continue;

		ret = rte_lpm6_add(ipv6_l3fwd_lpm_lookup_struct[socketid],
			ipv6_l3fwd_lpm_route_array[i].ip,
			ipv6_l3fwd_lpm_route_array[i].depth,
			ipv6_l3fwd_lpm_route_array[i].if_out);

		if (ret < 0) {
			rte_exit(EXIT_FAILURE,
				"Unable to add entry %u to the l3fwd LPM table on socket %d\n",
				i, socketid);
		}

		printf("LPM: Adding route %s / %d (%d)\n",
			"IPV6",
			ipv6_l3fwd_lpm_route_array[i].depth,
			ipv6_l3fwd_lpm_route_array[i].if_out);
	}
}

int
lpm_check_ptype(int portid)
{
	int i, ret;
	int ptype_l3_ipv4 = 0, ptype_l3_ipv6 = 0;
	uint32_t ptype_mask = RTE_PTYPE_L3_MASK;

	ret = rte_eth_dev_get_supported_ptypes(portid, ptype_mask, NULL, 0);
	if (ret <= 0)
		return 0;

	uint32_t ptypes[ret];

	ret = rte_eth_dev_get_supported_ptypes(portid, ptype_mask, ptypes, ret);
	for (i = 0; i < ret; ++i) {
		if (ptypes[i] & RTE_PTYPE_L3_IPV4)
			ptype_l3_ipv4 = 1;
		if (ptypes[i] & RTE_PTYPE_L3_IPV6)
			ptype_l3_ipv6 = 1;
	}

	if (ptype_l3_ipv4 == 0)
		printf("port %d cannot parse RTE_PTYPE_L3_IPV4\n", portid);

	if (ptype_l3_ipv6 == 0)
		printf("port %d cannot parse RTE_PTYPE_L3_IPV6\n", portid);

	if (ptype_l3_ipv4 && ptype_l3_ipv6)
		return 1;

	return 0;

}

static inline void
lpm_parse_ptype(struct rte_mbuf *m)
{
	struct ether_hdr *eth_hdr;
	uint32_t packet_type = RTE_PTYPE_UNKNOWN;
	uint16_t ether_type;

	eth_hdr = rte_pktmbuf_mtod(m, struct ether_hdr *);
	ether_type = eth_hdr->ether_type;
	if (ether_type == rte_cpu_to_be_16(ETHER_TYPE_IPv4))
		packet_type |= RTE_PTYPE_L3_IPV4_EXT_UNKNOWN;
	else if (ether_type == rte_cpu_to_be_16(ETHER_TYPE_IPv6))
		packet_type |= RTE_PTYPE_L3_IPV6_EXT_UNKNOWN;

	m->packet_type = packet_type;
}

uint16_t
lpm_cb_parse_ptype(uint8_t port __rte_unused, uint16_t queue __rte_unused,
		   struct rte_mbuf *pkts[], uint16_t nb_pkts,
		   uint16_t max_pkts __rte_unused,
		   void *user_param __rte_unused)
{
	unsigned i;

	for (i = 0; i < nb_pkts; ++i)
		lpm_parse_ptype(pkts[i]);

	return nb_pkts;
}

/* Return ipv4/ipv6 lpm fwd lookup struct. */
void *
lpm_get_ipv4_l3fwd_lookup_struct(const int socketid)
{
	return ipv4_l3fwd_lpm_lookup_struct[socketid];
}

void *
lpm_get_ipv6_l3fwd_lookup_struct(const int socketid)
{
	return ipv6_l3fwd_lpm_lookup_struct[socketid];
}