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/*
// Copyright (c) 2010-2017 Intel Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
*/

#include <rte_lcore.h>
#include <rte_hash.h>
#include <rte_hash_crc.h>
#include "task_base.h"
#include "lconf.h"
#include "prefetch.h"
#include "log.h"
#include "handle_master.h"
#include "prox_port_cfg.h"

#define IP4(x) x & 0xff, (x >> 8) & 0xff, (x >> 16) & 0xff, x >> 24

static inline int find_ip(struct ether_hdr_arp *pkt, uint16_t len, uint32_t *ip_dst)
{
	struct vlan_hdr *vlan_hdr;
	struct ether_hdr *eth_hdr = (struct ether_hdr*)pkt;
	struct ipv4_hdr *ip;
	uint16_t ether_type = eth_hdr->ether_type;
	uint16_t l2_len = sizeof(struct ether_hdr);

	// Unstack VLAN tags
	while (((ether_type == ETYPE_8021ad) || (ether_type == ETYPE_VLAN)) && (l2_len + sizeof(struct vlan_hdr) < len)) {
		vlan_hdr = (struct vlan_hdr *)((uint8_t *)pkt + l2_len);
		l2_len +=4;
		ether_type = vlan_hdr->eth_proto;
	}

	switch (ether_type) {
	case ETYPE_MPLSU:
	case ETYPE_MPLSM:
		// In case of MPLS, next hop MAC is based on MPLS, not destination IP
		l2_len = 0;
		break;
	case ETYPE_IPv4:
		break;
	case ETYPE_EoGRE:
	case ETYPE_ARP:
	case ETYPE_IPv6:
		l2_len = 0;
		break;
	default:
		l2_len = 0;
		plog_warn("Unsupported packet type %x - CRC might be wrong\n", ether_type);
		break;
	}

	if (l2_len && (l2_len + sizeof(struct ipv4_hdr) <= len)) {
		struct ipv4_hdr *ip = (struct ipv4_hdr *)((uint8_t *)pkt + l2_len);
		// TODO: implement LPM => replace ip_dst by next hop IP DST
		*ip_dst = ip->dst_addr;
		return 0;
	}
	return -1;
}

int write_dst_mac(struct task_base *tbase, struct rte_mbuf *mbuf, uint32_t *ip_dst)
{
	const uint64_t hz = rte_get_tsc_hz();
	struct ether_hdr_arp *packet = rte_pktmbuf_mtod(mbuf, struct ether_hdr_arp *);
	struct ether_addr *mac = &packet->ether_hdr.d_addr;

	uint64_t tsc = rte_rdtsc();
	struct l3_base *l3 = &(tbase->l3);
	if (l3->gw.ip) {
		if (likely((l3->flags & FLAG_DST_MAC_KNOWN) && (tsc < l3->gw.arp_update_time) && (tsc < l3->gw.arp_timeout))) {
			memcpy(mac, &l3->gw.mac, sizeof(struct ether_addr));
			return 0;
		} else if (tsc > l3->gw.arp_update_time) {
			// long time since we have sent an arp, send arp
			l3->gw.arp_update_time = tsc + hz;
			*ip_dst = l3->gw.ip;
			return -1;
		}
		return -2;
	}

	uint16_t len = rte_pktmbuf_pkt_len(mbuf);
	if (find_ip(packet, len, ip_dst) != 0) {
		return 0;
	}
	if (likely(l3->n_pkts < 4)) {
		for (unsigned int idx = 0; idx < l3->n_pkts; idx++) {
			if (*ip_dst == l3->optimized_arp_table[idx].ip) {
				if ((tsc < l3->optimized_arp_table[idx].arp_update_time) && (tsc < l3->optimized_arp_table[idx].arp_timeout)) {
					memcpy(mac, &l3->optimized_arp_table[idx].mac, sizeof(struct ether_addr));
					return 0;
				} else if (tsc > l3->optimized_arp_table[idx].arp_update_time) {
					l3->optimized_arp_table[idx].arp_update_time = tsc + hz;
					return -1;
				} else {
					return -2;
				}
			}
		}
		l3->optimized_arp_table[l3->n_pkts].ip = *ip_dst;
		l3->optimized_arp_table[l3->n_pkts].arp_update_time = tsc + hz;
		l3->n_pkts++;

		if (l3->n_pkts < 4)
			return -1;

		// We have ** many ** IP addresses; lets use hash table instead
		for (uint32_t idx = 0; idx < l3->n_pkts; idx++) {
			uint32_t ip = l3->optimized_arp_table[idx].ip;
			int ret = rte_hash_add_key(l3->ip_hash, (const void *)&ip);
			if (ret < 0) {
				plogx_info("Unable add ip %d.%d.%d.%d in mac_hash\n", IP4(ip));
			} else {
				memcpy(&l3->arp_table[ret], &l3->optimized_arp_table[idx], sizeof(struct arp_table));
			}
		}
		return -1;
	} else {
		// Find mac in lookup table. Send ARP if not found
		int ret = rte_hash_lookup(l3->ip_hash, (const void *)ip_dst);
		if (unlikely(ret < 0)) {
			int ret = rte_hash_add_key(l3->ip_hash, (const void *)ip_dst);
			if (ret < 0) {
				plogx_info("Unable add ip %d.%d.%d.%d in mac_hash\n", IP4(*ip_dst));
				return -2;
			} else {
				l3->arp_table[ret].ip = *ip_dst;
				l3->arp_table[ret].arp_update_time = tsc + hz;
			}
			return -1;
		} else {
			if ((tsc < l3->arp_table[ret].arp_update_time) && (tsc < l3->arp_table[ret].arp_timeout)) {
				memcpy(mac, &l3->arp_table[ret].mac, sizeof(struct ether_addr));
				return 0;
			} else if (tsc > l3->arp_table[ret].arp_update_time) {
				l3->arp_table[ret].arp_update_time = tsc + hz;
				return -1;
			} else {
				return -2;
			}
		}
	}
	return 0;
}

void task_init_l3(struct task_base *tbase, struct task_args *targ)
{
	static char hash_name[30];
	uint32_t n_entries = MAX_ARP_ENTRIES * 4;
	const int socket_id = rte_lcore_to_socket_id(targ->lconf->id);
	sprintf(hash_name, "A%03d_mac_table", targ->lconf->id);

	hash_name[0]++;

	struct rte_hash_parameters hash_params = {
		.name = hash_name,
		.entries = n_entries,
		.key_len = sizeof(uint32_t),
		.hash_func = rte_hash_crc,
		.hash_func_init_val = 0,
	};
	tbase->l3.ip_hash = rte_hash_create(&hash_params);
	PROX_PANIC(tbase->l3.ip_hash == NULL, "Failed to set up ip hash table\n");

	tbase->l3.arp_table = (struct arp_table *)prox_zmalloc(n_entries * sizeof(struct arp_table), socket_id);
	PROX_PANIC(tbase->l3.arp_table == NULL, "Failed to allocate memory for %u entries in arp table\n", n_entries);
	plog_info("\tarp table, with %d entries of size %ld\n", n_entries, sizeof(struct l3_base));

	targ->lconf->ctrl_func_p[targ->task] = handle_ctrl_plane_pkts;
	targ->lconf->ctrl_timeout = freq_to_tsc(targ->ctrl_freq);
	tbase->l3.gw.ip = rte_cpu_to_be_32(targ->gateway_ipv4);
	tbase->flags |= TASK_L3;
	tbase->l3.core_id = targ->lconf->id;
	tbase->l3.task_id = targ->id;
	tbase->l3.tmaster = targ->tmaster;
}

void task_start_l3(struct task_base *tbase, struct task_args *targ)
{
	struct prox_port_cfg *port = find_reachable_port(targ);
        if (port) {
                tbase->l3.reachable_port_id = port - prox_port_cfg;
		if (targ->local_ipv4) {
			tbase->local_ipv4 = rte_be_to_cpu_32(targ->local_ipv4);
			register_ip_to_ctrl_plane(tbase->l3.tmaster, tbase->local_ipv4, tbase->l3.reachable_port_id, targ->lconf->id, targ->id);
        	}
	}
}

void task_set_gateway_ip(struct task_base *tbase, uint32_t ip)
{
	tbase->l3.gw.ip = ip;
	tbase->flags &= ~FLAG_DST_MAC_KNOWN;
}

void task_set_local_ip(struct task_base *tbase, uint32_t ip)
{
	tbase->local_ipv4 = ip;
}

void handle_ctrl_plane_pkts(struct task_base *tbase, struct rte_mbuf **mbufs, uint16_t n_pkts)
{
	uint8_t out[1];
	const uint64_t hz = rte_get_tsc_hz();
	uint32_t ip, ip_dst, idx;
	int j;
	uint16_t command;
	struct ether_hdr_arp *hdr;
	struct l3_base *l3 = &tbase->l3;
	uint64_t tsc= rte_rdtsc();

	for (j = 0; j < n_pkts; ++j) {
		PREFETCH0(mbufs[j]);
	}
	for (j = 0; j < n_pkts; ++j) {
		PREFETCH0(rte_pktmbuf_mtod(mbufs[j], void *));
	}

	for (j = 0; j < n_pkts; ++j) {
		out[0] = OUT_HANDLED;
		command = mbufs[j]->udata64 & 0xFFFF;
		plogx_dbg("\tReceived %s mbuf %p\n", actions_string[command], mbufs[j]);
		switch(command) {
		case UPDATE_FROM_CTRL:
			hdr = rte_pktmbuf_mtod(mbufs[j], struct ether_hdr_arp *);
			ip = (mbufs[j]->udata64 >> 32) & 0xFFFFFFFF;

			if (ip == l3->gw.ip) {
				// MAC address of the gateway
				memcpy(&l3->gw.mac, &hdr->arp.data.sha, 6);
				l3->flags |= FLAG_DST_MAC_KNOWN;
				l3->gw.arp_timeout = tsc + 30 * hz;
			} else if (l3->n_pkts < 4) {
				// Few packets tracked - should be faster to loop through them thean using a hash table
				for (idx = 0; idx < l3->n_pkts; idx++) {
					ip_dst = l3->optimized_arp_table[idx].ip;
					if (ip_dst == ip)
						break;
				}
				if (idx < l3->n_pkts) {
					// IP not found; this is a reply while we never asked for the request!
					memcpy(&l3->optimized_arp_table[idx].mac, &(hdr->arp.data.sha), sizeof(struct ether_addr));
					l3->optimized_arp_table[idx].arp_timeout = tsc + 30 * hz;
				}
			} else {
				int ret = rte_hash_add_key(l3->ip_hash, (const void *)&ip);
				if (ret < 0) {
					plogx_info("Unable add ip %d.%d.%d.%d in mac_hash\n", IP4(ip));
				} else {
					memcpy(&l3->arp_table[ret].mac, &(hdr->arp.data.sha), sizeof(struct ether_addr));
					l3->arp_table[ret].arp_timeout = tsc + 30 * hz;
				}
			}
			tx_drop(mbufs[j]);
			break;
		case ARP_REPLY_FROM_CTRL:
		case ARP_REQ_FROM_CTRL:
			out[0] = 0;
			tbase->aux->tx_pkt_l2(tbase, &mbufs[j], 1, out);
			break;
		}
	}
}