/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright 2014-2020 Mellanox Technologies, Ltd
 */

#include <stdarg.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <stdint.h>
#include <unistd.h>
#include <inttypes.h>

#include <sys/queue.h>
#include <sys/stat.h>

#include <rte_common.h>
#include <rte_byteorder.h>
#include <rte_log.h>
#include <rte_debug.h>
#include <rte_cycles.h>
#include <rte_memory.h>
#include <rte_memcpy.h>
#include <rte_launch.h>
#include <rte_eal.h>
#include <rte_per_lcore.h>
#include <rte_lcore.h>
#include <rte_branch_prediction.h>
#include <rte_mempool.h>
#include <rte_mbuf.h>
#include <rte_interrupts.h>
#include <rte_ether.h>
#include <rte_ethdev.h>
#include <rte_ip.h>
#include <rte_tcp.h>
#include <rte_udp.h>
#include <rte_string_fns.h>
#include <rte_flow.h>

#include "testpmd.h"

static uint32_t cfg_ip_src	= RTE_IPV4(10, 254, 0, 0);
static uint32_t cfg_ip_dst	= RTE_IPV4(10, 253, 0, 0);
static uint16_t cfg_udp_src	= 1000;
static uint16_t cfg_udp_dst	= 1001;
static struct rte_ether_addr cfg_ether_src =
	{{ 0x00, 0x01, 0x02, 0x03, 0x04, 0x00 }};
static struct rte_ether_addr cfg_ether_dst =
	{{ 0x00, 0x01, 0x02, 0x03, 0x04, 0x01 }};

#define IP_DEFTTL  64   /* from RFC 1340. */

RTE_DEFINE_PER_LCORE(int, _next_flow);

/*
 * Multi-flow generation mode.
 *
 * We originate a bunch of flows (varying destination IP addresses), and
 * terminate receive traffic.  Received traffic is simply discarded, but we
 * still do so in order to maintain traffic statistics.
 */
static bool
pkt_burst_flow_gen(struct fwd_stream *fs)
{
	unsigned pkt_size = tx_pkt_length - 4;	/* Adjust FCS */
	struct rte_mbuf  *pkts_burst[MAX_PKT_BURST];
	struct rte_mempool *mbp;
	struct rte_mbuf  *pkt = NULL;
	struct rte_ether_hdr *eth_hdr;
	struct rte_ipv4_hdr *ip_hdr;
	struct rte_udp_hdr *udp_hdr;
	uint16_t vlan_tci, vlan_tci_outer;
	uint64_t ol_flags = 0;
	uint16_t nb_rx;
	uint16_t nb_tx;
	uint16_t nb_dropped;
	uint16_t nb_pkt;
	uint16_t nb_clones = nb_pkt_flowgen_clones;
	uint64_t tx_offloads;
	int next_flow = RTE_PER_LCORE(_next_flow);

	/* Receive a burst of packets and discard them. */
	nb_rx = common_fwd_stream_receive(fs, pkts_burst, nb_pkt_per_burst);

	rte_pktmbuf_free_bulk(pkts_burst, nb_rx);

	mbp = current_fwd_lcore()->mbp;
	vlan_tci = ports[fs->tx_port].tx_vlan_id;
	vlan_tci_outer = ports[fs->tx_port].tx_vlan_id_outer;

	tx_offloads = ports[fs->tx_port].dev_conf.txmode.offloads;
	if (tx_offloads	& RTE_ETH_TX_OFFLOAD_VLAN_INSERT)
		ol_flags |= RTE_MBUF_F_TX_VLAN;
	if (tx_offloads & RTE_ETH_TX_OFFLOAD_QINQ_INSERT)
		ol_flags |= RTE_MBUF_F_TX_QINQ;
	if (tx_offloads	& RTE_ETH_TX_OFFLOAD_MACSEC_INSERT)
		ol_flags |= RTE_MBUF_F_TX_MACSEC;

	for (nb_pkt = 0; nb_pkt < nb_pkt_per_burst; nb_pkt++) {
		if (!nb_pkt || !nb_clones) {
			nb_clones = nb_pkt_flowgen_clones;
			/* Logic limitation */
			if (nb_clones > nb_pkt_per_burst)
				nb_clones = nb_pkt_per_burst;

			pkt = rte_mbuf_raw_alloc(mbp);
			if (!pkt)
				break;

			pkt->data_len = pkt_size;
			pkt->next = NULL;

			/* Initialize Ethernet header. */
			eth_hdr = rte_pktmbuf_mtod(pkt, struct rte_ether_hdr *);
			rte_ether_addr_copy(&cfg_ether_dst, &eth_hdr->dst_addr);
			rte_ether_addr_copy(&cfg_ether_src, &eth_hdr->src_addr);
			eth_hdr->ether_type = rte_cpu_to_be_16(RTE_ETHER_TYPE_IPV4);

			/* Initialize IP header. */
			ip_hdr = (struct rte_ipv4_hdr *)(eth_hdr + 1);
			memset(ip_hdr, 0, sizeof(*ip_hdr));
			ip_hdr->version_ihl	= RTE_IPV4_VHL_DEF;
			ip_hdr->type_of_service	= 0;
			ip_hdr->fragment_offset	= 0;
			ip_hdr->time_to_live	= IP_DEFTTL;
			ip_hdr->next_proto_id	= IPPROTO_UDP;
			ip_hdr->packet_id	= 0;
			ip_hdr->src_addr	= rte_cpu_to_be_32(cfg_ip_src);
			ip_hdr->dst_addr	= rte_cpu_to_be_32(cfg_ip_dst +
								   next_flow);
			ip_hdr->total_length	= RTE_CPU_TO_BE_16(pkt_size -
								   sizeof(*eth_hdr));
			ip_hdr->hdr_checksum	= rte_ipv4_cksum(ip_hdr);

			/* Initialize UDP header. */
			udp_hdr = (struct rte_udp_hdr *)(ip_hdr + 1);
			udp_hdr->src_port	= rte_cpu_to_be_16(cfg_udp_src);
			udp_hdr->dst_port	= rte_cpu_to_be_16(cfg_udp_dst);
			udp_hdr->dgram_cksum	= 0; /* No UDP checksum. */
			udp_hdr->dgram_len	= RTE_CPU_TO_BE_16(pkt_size -
								   sizeof(*eth_hdr) -
								   sizeof(*ip_hdr));
			pkt->nb_segs		= 1;
			pkt->pkt_len		= pkt_size;
			pkt->ol_flags		&= RTE_MBUF_F_EXTERNAL;
			pkt->ol_flags		|= ol_flags;
			pkt->vlan_tci		= vlan_tci;
			pkt->vlan_tci_outer	= vlan_tci_outer;
			pkt->l2_len		= sizeof(struct rte_ether_hdr);
			pkt->l3_len		= sizeof(struct rte_ipv4_hdr);
		} else {
			nb_clones--;
			rte_mbuf_refcnt_update(pkt, 1);
		}
		pkts_burst[nb_pkt] = pkt;

		if (++next_flow >= nb_flows_flowgen)
			next_flow = 0;
	}

	nb_tx = common_fwd_stream_transmit(fs, pkts_burst, nb_pkt);
	nb_dropped = nb_pkt - nb_tx;
	if (unlikely(nb_dropped > 0)) {
		/* Back out the flow counter. */
		next_flow -= nb_dropped;
		while (next_flow < 0)
			next_flow += nb_flows_flowgen;
	}

	RTE_PER_LCORE(_next_flow) = next_flow;

	return true;
}

static int
flowgen_begin(portid_t pi)
{
	printf("  number of flows for port %u: %d\n", pi, nb_flows_flowgen);
	return 0;
}

struct fwd_engine flow_gen_engine = {
	.fwd_mode_name  = "flowgen",
	.port_fwd_begin = flowgen_begin,
	.stream_init    = common_fwd_stream_init,
	.packet_fwd     = pkt_burst_flow_gen,
};