/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2016 Intel Corporation.
 * Copyright(c) 2014 6WIND S.A.
 * All rights reserved.
 */

#include <time.h>

#include <pcap.h>

#include <rte_cycles.h>
#include <ethdev_driver.h>
#include <ethdev_vdev.h>
#include <rte_kvargs.h>
#include <rte_malloc.h>
#include <rte_mbuf.h>
#include <rte_mbuf_dyn.h>
#include <rte_bus_vdev.h>
#include <rte_os_shim.h>

#include "pcap_osdep.h"

#define RTE_ETH_PCAP_SNAPSHOT_LEN 65535
#define RTE_ETH_PCAP_SNAPLEN RTE_ETHER_MAX_JUMBO_FRAME_LEN
#define RTE_ETH_PCAP_PROMISC 1
#define RTE_ETH_PCAP_TIMEOUT -1

#define ETH_PCAP_RX_PCAP_ARG  "rx_pcap"
#define ETH_PCAP_TX_PCAP_ARG  "tx_pcap"
#define ETH_PCAP_RX_IFACE_ARG "rx_iface"
#define ETH_PCAP_RX_IFACE_IN_ARG "rx_iface_in"
#define ETH_PCAP_TX_IFACE_ARG "tx_iface"
#define ETH_PCAP_IFACE_ARG    "iface"
#define ETH_PCAP_PHY_MAC_ARG  "phy_mac"
#define ETH_PCAP_INFINITE_RX_ARG  "infinite_rx"

#define ETH_PCAP_ARG_MAXLEN     64

#define RTE_PMD_PCAP_MAX_QUEUES 16

static char errbuf[PCAP_ERRBUF_SIZE];
static struct timespec start_time;
static uint64_t start_cycles;
static uint64_t hz;
static uint8_t iface_idx;

static uint64_t timestamp_rx_dynflag;
static int timestamp_dynfield_offset = -1;

struct queue_stat {
        volatile unsigned long pkts;
        volatile unsigned long bytes;
        volatile unsigned long err_pkts;
        volatile unsigned long rx_nombuf;
};

struct queue_missed_stat {
        /* last value retrieved from pcap */
        unsigned int pcap;
        /* stores values lost by pcap stop or rollover */
        unsigned long mnemonic;
        /* value on last reset */
        unsigned long reset;
};

struct pcap_rx_queue {
        uint16_t port_id;
        uint16_t queue_id;
        struct rte_mempool *mb_pool;
        struct queue_stat rx_stat;
        struct queue_missed_stat missed_stat;
        char name[PATH_MAX];
        char type[ETH_PCAP_ARG_MAXLEN];

        /* Contains pre-generated packets to be looped through */
        struct rte_ring *pkts;
};

struct pcap_tx_queue {
        uint16_t port_id;
        uint16_t queue_id;
        struct queue_stat tx_stat;
        char name[PATH_MAX];
        char type[ETH_PCAP_ARG_MAXLEN];
};

struct pmd_internals {
        struct pcap_rx_queue rx_queue[RTE_PMD_PCAP_MAX_QUEUES];
        struct pcap_tx_queue tx_queue[RTE_PMD_PCAP_MAX_QUEUES];
        char devargs[ETH_PCAP_ARG_MAXLEN];
        struct rte_ether_addr eth_addr;
        int if_index;
        int single_iface;
        int phy_mac;
        unsigned int infinite_rx;
};

struct pmd_process_private {
        pcap_t *rx_pcap[RTE_PMD_PCAP_MAX_QUEUES];
        pcap_t *tx_pcap[RTE_PMD_PCAP_MAX_QUEUES];
        pcap_dumper_t *tx_dumper[RTE_PMD_PCAP_MAX_QUEUES];
};

struct pmd_devargs {
        unsigned int num_of_queue;
        struct devargs_queue {
                pcap_dumper_t *dumper;
                pcap_t *pcap;
                const char *name;
                const char *type;
        } queue[RTE_PMD_PCAP_MAX_QUEUES];
        int phy_mac;
};

struct pmd_devargs_all {
        struct pmd_devargs rx_queues;
        struct pmd_devargs tx_queues;
        int single_iface;
        unsigned int is_tx_pcap;
        unsigned int is_tx_iface;
        unsigned int is_rx_pcap;
        unsigned int is_rx_iface;
        unsigned int infinite_rx;
};

static const char *valid_arguments[] = {
        ETH_PCAP_RX_PCAP_ARG,
        ETH_PCAP_TX_PCAP_ARG,
        ETH_PCAP_RX_IFACE_ARG,
        ETH_PCAP_RX_IFACE_IN_ARG,
        ETH_PCAP_TX_IFACE_ARG,
        ETH_PCAP_IFACE_ARG,
        ETH_PCAP_PHY_MAC_ARG,
        ETH_PCAP_INFINITE_RX_ARG,
        NULL
};

static struct rte_eth_link pmd_link = {
                .link_speed = RTE_ETH_SPEED_NUM_10G,
                .link_duplex = RTE_ETH_LINK_FULL_DUPLEX,
                .link_status = RTE_ETH_LINK_DOWN,
                .link_autoneg = RTE_ETH_LINK_FIXED,
};

RTE_LOG_REGISTER_DEFAULT(eth_pcap_logtype, NOTICE);

static struct queue_missed_stat*
queue_missed_stat_update(struct rte_eth_dev *dev, unsigned int qid)
{
        struct pmd_internals *internals = dev->data->dev_private;
        struct queue_missed_stat *missed_stat =
                        &internals->rx_queue[qid].missed_stat;
        const struct pmd_process_private *pp = dev->process_private;
        pcap_t *pcap = pp->rx_pcap[qid];
        struct pcap_stat stat;

        if (!pcap || (pcap_stats(pcap, &stat) != 0))
                return missed_stat;

        /* rollover check - best effort fixup assuming single rollover */
        if (stat.ps_drop < missed_stat->pcap)
                missed_stat->mnemonic += UINT_MAX;
        missed_stat->pcap = stat.ps_drop;

        return missed_stat;
}

static void
queue_missed_stat_on_stop_update(struct rte_eth_dev *dev, unsigned int qid)
{
        struct queue_missed_stat *missed_stat =
                        queue_missed_stat_update(dev, qid);

        missed_stat->mnemonic += missed_stat->pcap;
        missed_stat->pcap = 0;
}

static void
queue_missed_stat_reset(struct rte_eth_dev *dev, unsigned int qid)
{
        struct queue_missed_stat *missed_stat =
                        queue_missed_stat_update(dev, qid);

        missed_stat->reset = missed_stat->pcap;
        missed_stat->mnemonic = 0;
}

static unsigned long
queue_missed_stat_get(struct rte_eth_dev *dev, unsigned int qid)
{
        const struct queue_missed_stat *missed_stat =
                        queue_missed_stat_update(dev, qid);

        return missed_stat->pcap + missed_stat->mnemonic - missed_stat->reset;
}

static int
eth_pcap_rx_jumbo(struct rte_mempool *mb_pool, struct rte_mbuf *mbuf,
                const u_char *data, uint16_t data_len)
{
        /* Copy the first segment. */
        uint16_t len = rte_pktmbuf_tailroom(mbuf);
        struct rte_mbuf *m = mbuf;

        rte_memcpy(rte_pktmbuf_append(mbuf, len), data, len);
        data_len -= len;
        data += len;

        while (data_len > 0) {
                /* Allocate next mbuf and point to that. */
                m->next = rte_pktmbuf_alloc(mb_pool);

                if (unlikely(!m->next))
                        return -1;

                m = m->next;

                /* Headroom is not needed in chained mbufs. */
                rte_pktmbuf_prepend(m, rte_pktmbuf_headroom(m));
                m->pkt_len = 0;
                m->data_len = 0;

                /* Copy next segment. */
                len = RTE_MIN(rte_pktmbuf_tailroom(m), data_len);
                rte_memcpy(rte_pktmbuf_append(m, len), data, len);

                mbuf->nb_segs++;
                data_len -= len;
                data += len;
        }

        return mbuf->nb_segs;
}

static uint16_t
eth_pcap_rx_infinite(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
{
        int i;
        struct pcap_rx_queue *pcap_q = queue;
        uint32_t rx_bytes = 0;

        if (unlikely(nb_pkts == 0))
                return 0;

        if (rte_pktmbuf_alloc_bulk(pcap_q->mb_pool, bufs, nb_pkts) != 0)
                return 0;

        for (i = 0; i < nb_pkts; i++) {
                struct rte_mbuf *pcap_buf;
                int err = rte_ring_dequeue(pcap_q->pkts, (void **)&pcap_buf);
                if (err)
                        return i;

                rte_memcpy(rte_pktmbuf_mtod(bufs[i], void *),
                                rte_pktmbuf_mtod(pcap_buf, void *),
                                pcap_buf->data_len);
                bufs[i]->data_len = pcap_buf->data_len;
                bufs[i]->pkt_len = pcap_buf->pkt_len;
                bufs[i]->port = pcap_q->port_id;
                rx_bytes += pcap_buf->data_len;

                /* Enqueue packet back on ring to allow infinite rx. */
                rte_ring_enqueue(pcap_q->pkts, pcap_buf);
        }

        pcap_q->rx_stat.pkts += i;
        pcap_q->rx_stat.bytes += rx_bytes;

        return i;
}

static uint16_t
eth_pcap_rx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
{
        unsigned int i;
        struct pcap_pkthdr header;
        struct pmd_process_private *pp;
        const u_char *packet;
        struct rte_mbuf *mbuf;
        struct pcap_rx_queue *pcap_q = queue;
        uint16_t num_rx = 0;
        uint32_t rx_bytes = 0;
        pcap_t *pcap;

        pp = rte_eth_devices[pcap_q->port_id].process_private;
        pcap = pp->rx_pcap[pcap_q->queue_id];

        if (unlikely(pcap == NULL || nb_pkts == 0))
                return 0;

        /* Reads the given number of packets from the pcap file one by one
         * and copies the packet data into a newly allocated mbuf to return.
         */
        for (i = 0; i < nb_pkts; i++) {
                /* Get the next PCAP packet */
                packet = pcap_next(pcap, &header);
                if (unlikely(packet == NULL))
                        break;

                mbuf = rte_pktmbuf_alloc(pcap_q->mb_pool);
                if (unlikely(mbuf == NULL)) {
                        pcap_q->rx_stat.rx_nombuf++;
                        break;
                }

                if (header.caplen <= rte_pktmbuf_tailroom(mbuf)) {
                        /* pcap packet will fit in the mbuf, can copy it */
                        rte_memcpy(rte_pktmbuf_mtod(mbuf, void *), packet,
                                        header.caplen);
                        mbuf->data_len = (uint16_t)header.caplen;
                } else {
                        /* Try read jumbo frame into multi mbufs. */
                        if (unlikely(eth_pcap_rx_jumbo(pcap_q->mb_pool,
                                                       mbuf,
                                                       packet,
                                                       header.caplen) == -1)) {
                                pcap_q->rx_stat.err_pkts++;
                                rte_pktmbuf_free(mbuf);
                                break;
                        }
                }

                mbuf->pkt_len = (uint16_t)header.caplen;
                *RTE_MBUF_DYNFIELD(mbuf, timestamp_dynfield_offset,
                        rte_mbuf_timestamp_t *) =
                                (uint64_t)header.ts.tv_sec * 1000000 +
                                header.ts.tv_usec;
                mbuf->ol_flags |= timestamp_rx_dynflag;
                mbuf->port = pcap_q->port_id;
                bufs[num_rx] = mbuf;
                num_rx++;
                rx_bytes += header.caplen;
        }
        pcap_q->rx_stat.pkts += num_rx;
        pcap_q->rx_stat.bytes += rx_bytes;

        return num_rx;
}

static uint16_t
eth_null_rx(void *queue __rte_unused,
                struct rte_mbuf **bufs __rte_unused,
                uint16_t nb_pkts __rte_unused)
{
        return 0;
}

#define NSEC_PER_SEC    1000000000L

/*
 * This function stores nanoseconds in `tv_usec` field of `struct timeval`,
 * because `ts` goes directly to nanosecond-precision dump.
 */
static inline void
calculate_timestamp(struct timeval *ts) {
        uint64_t cycles;
        struct timespec cur_time;

        cycles = rte_get_timer_cycles() - start_cycles;
        cur_time.tv_sec = cycles / hz;
        cur_time.tv_nsec = (cycles % hz) * NSEC_PER_SEC / hz;

        ts->tv_sec = start_time.tv_sec + cur_time.tv_sec;
        ts->tv_usec = start_time.tv_nsec + cur_time.tv_nsec;
        if (ts->tv_usec >= NSEC_PER_SEC) {
                ts->tv_usec -= NSEC_PER_SEC;
                ts->tv_sec += 1;
        }
}

/*
 * Callback to handle writing packets to a pcap file.
 */
static uint16_t
eth_pcap_tx_dumper(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
{
        unsigned int i;
        struct rte_mbuf *mbuf;
        struct pmd_process_private *pp;
        struct pcap_tx_queue *dumper_q = queue;
        uint16_t num_tx = 0;
        uint32_t tx_bytes = 0;
        struct pcap_pkthdr header;
        pcap_dumper_t *dumper;
        unsigned char temp_data[RTE_ETH_PCAP_SNAPLEN];
        size_t len, caplen;

        pp = rte_eth_devices[dumper_q->port_id].process_private;
        dumper = pp->tx_dumper[dumper_q->queue_id];

        if (dumper == NULL || nb_pkts == 0)
                return 0;

        /* writes the nb_pkts packets to the previously opened pcap file
         * dumper */
        for (i = 0; i < nb_pkts; i++) {
                mbuf = bufs[i];
                len = caplen = rte_pktmbuf_pkt_len(mbuf);
                if (unlikely(!rte_pktmbuf_is_contiguous(mbuf) &&
                                len > sizeof(temp_data))) {
                        caplen = sizeof(temp_data);
                }

                calculate_timestamp(&header.ts);
                header.len = len;
                header.caplen = caplen;
                /* rte_pktmbuf_read() returns a pointer to the data directly
                 * in the mbuf (when the mbuf is contiguous) or, otherwise,
                 * a pointer to temp_data after copying into it.
                 */
                pcap_dump((u_char *)dumper, &header,
                        rte_pktmbuf_read(mbuf, 0, caplen, temp_data));

                num_tx++;
                tx_bytes += caplen;
                rte_pktmbuf_free(mbuf);
        }

        /*
         * Since there's no place to hook a callback when the forwarding
         * process stops and to make sure the pcap file is actually written,
         * we flush the pcap dumper within each burst.
         */
        pcap_dump_flush(dumper);
        dumper_q->tx_stat.pkts += num_tx;
        dumper_q->tx_stat.bytes += tx_bytes;
        dumper_q->tx_stat.err_pkts += nb_pkts - num_tx;

        return nb_pkts;
}

/*
 * Callback to handle dropping packets in the infinite rx case.
 */
static uint16_t
eth_tx_drop(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
{
        unsigned int i;
        uint32_t tx_bytes = 0;
        struct pcap_tx_queue *tx_queue = queue;

        if (unlikely(nb_pkts == 0))
                return 0;

        for (i = 0; i < nb_pkts; i++) {
                tx_bytes += bufs[i]->pkt_len;
                rte_pktmbuf_free(bufs[i]);
        }

        tx_queue->tx_stat.pkts += nb_pkts;
        tx_queue->tx_stat.bytes += tx_bytes;

        return i;
}

/*
 * Callback to handle sending packets through a real NIC.
 */
static uint16_t
eth_pcap_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
{
        unsigned int i;
        int ret;
        struct rte_mbuf *mbuf;
        struct pmd_process_private *pp;
        struct pcap_tx_queue *tx_queue = queue;
        uint16_t num_tx = 0;
        uint32_t tx_bytes = 0;
        pcap_t *pcap;
        unsigned char temp_data[RTE_ETH_PCAP_SNAPLEN];
        size_t len;

        pp = rte_eth_devices[tx_queue->port_id].process_private;
        pcap = pp->tx_pcap[tx_queue->queue_id];

        if (unlikely(nb_pkts == 0 || pcap == NULL))
                return 0;

        for (i = 0; i < nb_pkts; i++) {
                mbuf = bufs[i];
                len = rte_pktmbuf_pkt_len(mbuf);
                if (unlikely(!rte_pktmbuf_is_contiguous(mbuf) &&
                                len > sizeof(temp_data))) {
                        PMD_LOG(ERR,
                                "Dropping multi segment PCAP packet. Size (%zd) > max size (%zd).",
                                len, sizeof(temp_data));
                        rte_pktmbuf_free(mbuf);
                        continue;
                }

                /* rte_pktmbuf_read() returns a pointer to the data directly
                 * in the mbuf (when the mbuf is contiguous) or, otherwise,
                 * a pointer to temp_data after copying into it.
                 */
                ret = pcap_sendpacket(pcap,
                        rte_pktmbuf_read(mbuf, 0, len, temp_data), len);
                if (unlikely(ret != 0))
                        break;
                num_tx++;
                tx_bytes += len;
                rte_pktmbuf_free(mbuf);
        }

        tx_queue->tx_stat.pkts += num_tx;
        tx_queue->tx_stat.bytes += tx_bytes;
        tx_queue->tx_stat.err_pkts += i - num_tx;

        return i;
}

/*
 * pcap_open_live wrapper function
 */
static inline int
open_iface_live(const char *iface, pcap_t **pcap) {
        *pcap = pcap_open_live(iface, RTE_ETH_PCAP_SNAPLEN,
                        RTE_ETH_PCAP_PROMISC, RTE_ETH_PCAP_TIMEOUT, errbuf);

        if (*pcap == NULL) {
                PMD_LOG(ERR, "Couldn't open %s: %s", iface, errbuf);
                return -1;
        }

        return 0;
}

static int
open_single_iface(const char *iface, pcap_t **pcap)
{
        if (open_iface_live(iface, pcap) < 0) {
                PMD_LOG(ERR, "Couldn't open interface %s", iface);
                return -1;
        }

        return 0;
}

static int
open_single_tx_pcap(const char *pcap_filename, pcap_dumper_t **dumper)
{
        pcap_t *tx_pcap;

        /*
         * We need to create a dummy empty pcap_t to use it
         * with pcap_dump_open(). We create big enough an Ethernet
         * pcap holder.
         */
        tx_pcap = pcap_open_dead_with_tstamp_precision(DLT_EN10MB,
                        RTE_ETH_PCAP_SNAPSHOT_LEN, PCAP_TSTAMP_PRECISION_NANO);
        if (tx_pcap == NULL) {
                PMD_LOG(ERR, "Couldn't create dead pcap");
                return -1;
        }

        /* The dumper is created using the previous pcap_t reference */
        *dumper = pcap_dump_open(tx_pcap, pcap_filename);
        if (*dumper == NULL) {
                pcap_close(tx_pcap);
                PMD_LOG(ERR, "Couldn't open %s for writing.",
                        pcap_filename);
                return -1;
        }

        pcap_close(tx_pcap);
        return 0;
}

static int
open_single_rx_pcap(const char *pcap_filename, pcap_t **pcap)
{
        *pcap = pcap_open_offline(pcap_filename, errbuf);
        if (*pcap == NULL) {
                PMD_LOG(ERR, "Couldn't open %s: %s", pcap_filename,
                        errbuf);
                return -1;
        }

        return 0;
}

static uint64_t
count_packets_in_pcap(pcap_t **pcap, struct pcap_rx_queue *pcap_q)
{
        const u_char *packet;
        struct pcap_pkthdr header;
        uint64_t pcap_pkt_count = 0;

        while ((packet = pcap_next(*pcap, &header)))
                pcap_pkt_count++;

        /* The pcap is reopened so it can be used as normal later. */
        pcap_close(*pcap);
        *pcap = NULL;
        open_single_rx_pcap(pcap_q->name, pcap);

        return pcap_pkt_count;
}

static int
eth_dev_start(struct rte_eth_dev *dev)
{
        unsigned int i;
        struct pmd_internals *internals = dev->data->dev_private;
        struct pmd_process_private *pp = dev->process_private;
        struct pcap_tx_queue *tx;
        struct pcap_rx_queue *rx;

        /* Special iface case. Single pcap is open and shared between tx/rx. */
        if (internals->single_iface) {
                tx = &internals->tx_queue[0];
                rx = &internals->rx_queue[0];

                if (!pp->tx_pcap[0] &&
                        strcmp(tx->type, ETH_PCAP_IFACE_ARG) == 0) {
                        if (open_single_iface(tx->name, &pp->tx_pcap[0]) < 0)
                                return -1;
                        pp->rx_pcap[0] = pp->tx_pcap[0];
                }

                goto status_up;
        }

        /* If not open already, open tx pcaps/dumpers */
        for (i = 0; i < dev->data->nb_tx_queues; i++) {
                tx = &internals->tx_queue[i];

                if (!pp->tx_dumper[i] &&
                                strcmp(tx->type, ETH_PCAP_TX_PCAP_ARG) == 0) {
                        if (open_single_tx_pcap(tx->name,
                                &pp->tx_dumper[i]) < 0)
                                return -1;
                } else if (!pp->tx_pcap[i] &&
                                strcmp(tx->type, ETH_PCAP_TX_IFACE_ARG) == 0) {
                        if (open_single_iface(tx->name, &pp->tx_pcap[i]) < 0)
                                return -1;
                }
        }

        /* If not open already, open rx pcaps */
        for (i = 0; i < dev->data->nb_rx_queues; i++) {
                rx = &internals->rx_queue[i];

                if (pp->rx_pcap[i] != NULL)
                        continue;

                if (strcmp(rx->type, ETH_PCAP_RX_PCAP_ARG) == 0) {
                        if (open_single_rx_pcap(rx->name, &pp->rx_pcap[i]) < 0)
                                return -1;
                } else if (strcmp(rx->type, ETH_PCAP_RX_IFACE_ARG) == 0) {
                        if (open_single_iface(rx->name, &pp->rx_pcap[i]) < 0)
                                return -1;
                }
        }

status_up:
        for (i = 0; i < dev->data->nb_rx_queues; i++)
                dev->data->rx_queue_state[i] = RTE_ETH_QUEUE_STATE_STARTED;

        for (i = 0; i < dev->data->nb_tx_queues; i++)
                dev->data->tx_queue_state[i] = RTE_ETH_QUEUE_STATE_STARTED;

        dev->data->dev_link.link_status = RTE_ETH_LINK_UP;

        return 0;
}

/*
 * This function gets called when the current port gets stopped.
 * Is the only place for us to close all the tx streams dumpers.
 * If not called the dumpers will be flushed within each tx burst.
 */
static int
eth_dev_stop(struct rte_eth_dev *dev)
{
        unsigned int i;
        struct pmd_internals *internals = dev->data->dev_private;
        struct pmd_process_private *pp = dev->process_private;

        /* Special iface case. Single pcap is open and shared between tx/rx. */
        if (internals->single_iface) {
                queue_missed_stat_on_stop_update(dev, 0);
                if (pp->tx_pcap[0] != NULL) {
                        pcap_close(pp->tx_pcap[0]);
                        pp->tx_pcap[0] = NULL;
                        pp->rx_pcap[0] = NULL;
                }
                goto status_down;
        }

        for (i = 0; i < dev->data->nb_tx_queues; i++) {
                if (pp->tx_dumper[i] != NULL) {
                        pcap_dump_close(pp->tx_dumper[i]);
                        pp->tx_dumper[i] = NULL;
                }

                if (pp->tx_pcap[i] != NULL) {
                        pcap_close(pp->tx_pcap[i]);
                        pp->tx_pcap[i] = NULL;
                }
        }

        for (i = 0; i < dev->data->nb_rx_queues; i++) {
                if (pp->rx_pcap[i] != NULL) {
                        queue_missed_stat_on_stop_update(dev, i);
                        pcap_close(pp->rx_pcap[i]);
                        pp->rx_pcap[i] = NULL;
                }
        }

status_down:
        for (i = 0; i < dev->data->nb_rx_queues; i++)
                dev->data->rx_queue_state[i] = RTE_ETH_QUEUE_STATE_STOPPED;

        for (i = 0; i < dev->data->nb_tx_queues; i++)
                dev->data->tx_queue_state[i] = RTE_ETH_QUEUE_STATE_STOPPED;

        dev->data->dev_link.link_status = RTE_ETH_LINK_DOWN;

        return 0;
}

static int
eth_dev_configure(struct rte_eth_dev *dev __rte_unused)
{
        return 0;
}

static int
eth_dev_info(struct rte_eth_dev *dev,
                struct rte_eth_dev_info *dev_info)
{
        struct pmd_internals *internals = dev->data->dev_private;

        dev_info->if_index = internals->if_index;
        dev_info->max_mac_addrs = 1;
        dev_info->max_rx_pktlen = (uint32_t) -1;
        dev_info->max_rx_queues = dev->data->nb_rx_queues;
        dev_info->max_tx_queues = dev->data->nb_tx_queues;
        dev_info->min_rx_bufsize = 0;

        return 0;
}

static int
eth_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
{
        unsigned int i;
        unsigned long rx_packets_total = 0, rx_bytes_total = 0;
        unsigned long rx_missed_total = 0;
        unsigned long rx_nombuf_total = 0, rx_err_total = 0;
        unsigned long tx_packets_total = 0, tx_bytes_total = 0;
        unsigned long tx_packets_err_total = 0;
        const struct pmd_internals *internal = dev->data->dev_private;

        for (i = 0; i < RTE_ETHDEV_QUEUE_STAT_CNTRS &&
                        i < dev->data->nb_rx_queues; i++) {
                stats->q_ipackets[i] = internal->rx_queue[i].rx_stat.pkts;
                stats->q_ibytes[i] = internal->rx_queue[i].rx_stat.bytes;
                rx_nombuf_total += internal->rx_queue[i].rx_stat.rx_nombuf;
                rx_err_total += internal->rx_queue[i].rx_stat.err_pkts;
                rx_packets_total += stats->q_ipackets[i];
                rx_bytes_total += stats->q_ibytes[i];
                rx_missed_total += queue_missed_stat_get(dev, i);
        }

        for (i = 0; i < RTE_ETHDEV_QUEUE_STAT_CNTRS &&
                        i < dev->data->nb_tx_queues; i++) {
                stats->q_opackets[i] = internal->tx_queue[i].tx_stat.pkts;
                stats->q_obytes[i] = internal->tx_queue[i].tx_stat.bytes;
                tx_packets_total += stats->q_opackets[i];
                tx_bytes_total += stats->q_obytes[i];
                tx_packets_err_total += internal->tx_queue[i].tx_stat.err_pkts;
        }

        stats->ipackets = rx_packets_total;
        stats->ibytes = rx_bytes_total;
        stats->imissed = rx_missed_total;
        stats->ierrors = rx_err_total;
        stats->rx_nombuf = rx_nombuf_total;
        stats->opackets = tx_packets_total;
        stats->obytes = tx_bytes_total;
        stats->oerrors = tx_packets_err_total;

        return 0;
}

static int
eth_stats_reset(struct rte_eth_dev *dev)
{
        unsigned int i;
        struct pmd_internals *internal = dev->data->dev_private;

        for (i = 0; i < dev->data->nb_rx_queues; i++) {
                internal->rx_queue[i].rx_stat.pkts = 0;
                internal->rx_queue[i].rx_stat.bytes = 0;
                internal->rx_queue[i].rx_stat.err_pkts = 0;
                internal->rx_queue[i].rx_stat.rx_nombuf = 0;
                queue_missed_stat_reset(dev, i);
        }

        for (i = 0; i < dev->data->nb_tx_queues; i++) {
                internal->tx_queue[i].tx_stat.pkts = 0;
                internal->tx_queue[i].tx_stat.bytes = 0;
                internal->tx_queue[i].tx_stat.err_pkts = 0;
        }

        return 0;
}

static inline void
infinite_rx_ring_free(struct rte_ring *pkts)
{
        struct rte_mbuf *bufs;

        while (!rte_ring_dequeue(pkts, (void **)&bufs))
                rte_pktmbuf_free(bufs);

        rte_ring_free(pkts);
}

static int
eth_dev_close(struct rte_eth_dev *dev)
{
        unsigned int i;
        struct pmd_internals *internals = dev->data->dev_private;

        PMD_LOG(INFO, "Closing pcap ethdev on NUMA socket %d",
                        rte_socket_id());

        eth_dev_stop(dev);

        rte_free(dev->process_private);

        if (rte_eal_process_type() != RTE_PROC_PRIMARY)
                return 0;

        /* Device wide flag, but cleanup must be performed per queue. */
        if (internals->infinite_rx) {
                for (i = 0; i < dev->data->nb_rx_queues; i++) {
                        struct pcap_rx_queue *pcap_q = &internals->rx_queue[i];

                        /*
                         * 'pcap_q->pkts' can be NULL if 'eth_dev_close()'
                         * called before 'eth_rx_queue_setup()' has been called
                         */
                        if (pcap_q->pkts == NULL)
                                continue;

                        infinite_rx_ring_free(pcap_q->pkts);
                }
        }

        if (internals->phy_mac == 0)
                /* not dynamically allocated, must not be freed */
                dev->data->mac_addrs = NULL;

        return 0;
}

static int
eth_link_update(struct rte_eth_dev *dev __rte_unused,
                int wait_to_complete __rte_unused)
{
        return 0;
}

static int
eth_rx_queue_setup(struct rte_eth_dev *dev,
                uint16_t rx_queue_id,
                uint16_t nb_rx_desc __rte_unused,
                unsigned int socket_id __rte_unused,
                const struct rte_eth_rxconf *rx_conf __rte_unused,
                struct rte_mempool *mb_pool)
{
        struct pmd_internals *internals = dev->data->dev_private;
        struct pcap_rx_queue *pcap_q = &internals->rx_queue[rx_queue_id];

        pcap_q->mb_pool = mb_pool;
        pcap_q->port_id = dev->data->port_id;
        pcap_q->queue_id = rx_queue_id;
        dev->data->rx_queues[rx_queue_id] = pcap_q;

        if (internals->infinite_rx) {
                struct pmd_process_private *pp;
                char ring_name[RTE_RING_NAMESIZE];
                static uint32_t ring_number;
                uint64_t pcap_pkt_count = 0;
                struct rte_mbuf *bufs[1];
                pcap_t **pcap;

                pp = rte_eth_devices[pcap_q->port_id].process_private;
                pcap = &pp->rx_pcap[pcap_q->queue_id];

                if (unlikely(*pcap == NULL))
                        return -ENOENT;

                pcap_pkt_count = count_packets_in_pcap(pcap, pcap_q);

                snprintf(ring_name, sizeof(ring_name), "PCAP_RING%" PRIu32,
                                ring_number);

                pcap_q->pkts = rte_ring_create(ring_name,
                                rte_align64pow2(pcap_pkt_count + 1), 0,
                                RING_F_SP_ENQ | RING_F_SC_DEQ);
                ring_number++;
                if (!pcap_q->pkts)
                        return -ENOENT;

                /* Fill ring with packets from PCAP file one by one. */
                while (eth_pcap_rx(pcap_q, bufs, 1)) {
                        /* Check for multiseg mbufs. */
                        if (bufs[0]->nb_segs != 1) {
                                infinite_rx_ring_free(pcap_q->pkts);
                                PMD_LOG(ERR,
                                        "Multiseg mbufs are not supported in infinite_rx mode.");
                                return -EINVAL;
                        }

                        rte_ring_enqueue_bulk(pcap_q->pkts,
                                        (void * const *)bufs, 1, NULL);
                }

                if (rte_ring_count(pcap_q->pkts) < pcap_pkt_count) {
                        infinite_rx_ring_free(pcap_q->pkts);
                        PMD_LOG(ERR,
                                "Not enough mbufs to accommodate packets in pcap file. "
                                "At least %" PRIu64 " mbufs per queue is required.",
                                pcap_pkt_count);
                        return -EINVAL;
                }

                /*
                 * Reset the stats for this queue since eth_pcap_rx calls above
                 * didn't result in the application receiving packets.
                 */
                pcap_q->rx_stat.pkts = 0;
                pcap_q->rx_stat.bytes = 0;
        }

        return 0;
}

static int
eth_tx_queue_setup(struct rte_eth_dev *dev,
                uint16_t tx_queue_id,
                uint16_t nb_tx_desc __rte_unused,
                unsigned int socket_id __rte_unused,
                const struct rte_eth_txconf *tx_conf __rte_unused)
{
        struct pmd_internals *internals = dev->data->dev_private;
        struct pcap_tx_queue *pcap_q = &internals->tx_queue[tx_queue_id];

        pcap_q->port_id = dev->data->port_id;
        pcap_q->queue_id = tx_queue_id;
        dev->data->tx_queues[tx_queue_id] = pcap_q;

        return 0;
}

static int
eth_rx_queue_start(struct rte_eth_dev *dev, uint16_t rx_queue_id)
{
        dev->data->rx_queue_state[rx_queue_id] = RTE_ETH_QUEUE_STATE_STARTED;

        return 0;
}

static int
eth_tx_queue_start(struct rte_eth_dev *dev, uint16_t tx_queue_id)
{
        dev->data->tx_queue_state[tx_queue_id] = RTE_ETH_QUEUE_STATE_STARTED;

        return 0;
}

static int
eth_rx_queue_stop(struct rte_eth_dev *dev, uint16_t rx_queue_id)
{
        dev->data->rx_queue_state[rx_queue_id] = RTE_ETH_QUEUE_STATE_STOPPED;

        return 0;
}

static int
eth_tx_queue_stop(struct rte_eth_dev *dev, uint16_t tx_queue_id)
{
        dev->data->tx_queue_state[tx_queue_id] = RTE_ETH_QUEUE_STATE_STOPPED;

        return 0;
}

static const struct eth_dev_ops ops = {
        .dev_start = eth_dev_start,
        .dev_stop = eth_dev_stop,
        .dev_close = eth_dev_close,
        .dev_configure = eth_dev_configure,
        .dev_infos_get = eth_dev_info,
        .rx_queue_setup = eth_rx_queue_setup,
        .tx_queue_setup = eth_tx_queue_setup,
        .rx_queue_start = eth_rx_queue_start,

        .tx_queue_start = eth_tx_queue_start,
        .rx_queue_stop = eth_rx_queue_stop,
        .tx_queue_stop = eth_tx_queue_stop,
        .link_update = eth_link_update,
        .stats_get = eth_stats_get,
        .stats_reset = eth_stats_reset,
};

static int
add_queue(struct pmd_devargs *pmd, const char *name, const char *type,
                pcap_t *pcap, pcap_dumper_t *dumper)
{
        if (pmd->num_of_queue >= RTE_PMD_PCAP_MAX_QUEUES)
                return -1;
        if (pcap)
                pmd->queue[pmd->num_of_queue].pcap = pcap;
        if (dumper)
                pmd->queue[pmd->num_of_queue].dumper = dumper;
        pmd->queue[pmd->num_of_queue].name = name;
        pmd->queue[pmd->num_of_queue].type = type;
        pmd->num_of_queue++;
        return 0;
}

/*
 * Function handler that opens the pcap file for reading a stores a
 * reference of it for use it later on.
 */
static int
open_rx_pcap(const char *key, const char *value, void *extra_args)
{
        const char *pcap_filename = value;
        struct pmd_devargs *rx = extra_args;
        pcap_t *pcap = NULL;

        if (open_single_rx_pcap(pcap_filename, &pcap) < 0)
                return -1;

        if (add_queue(rx, pcap_filename, key, pcap, NULL) < 0) {
                pcap_close(pcap);
                return -1;
        }

        return 0;
}

/*
 * Opens a pcap file for writing and stores a reference to it
 * for use it later on.
 */
static int
open_tx_pcap(const char *key, const char *value, void *extra_args)
{
        const char *pcap_filename = value;
        struct pmd_devargs *dumpers = extra_args;
        pcap_dumper_t *dumper;

        if (open_single_tx_pcap(pcap_filename, &dumper) < 0)
                return -1;

        if (add_queue(dumpers, pcap_filename, key, NULL, dumper) < 0) {
                pcap_dump_close(dumper);
                return -1;
        }

        return 0;
}

/*
 * Opens an interface for reading and writing
 */
static inline int
open_rx_tx_iface(const char *key, const char *value, void *extra_args)
{
        const char *iface = value;
        struct pmd_devargs *tx = extra_args;
        pcap_t *pcap = NULL;

        if (open_single_iface(iface, &pcap) < 0)
                return -1;

        tx->queue[0].pcap = pcap;
        tx->queue[0].name = iface;
        tx->queue[0].type = key;

        return 0;
}

static inline int
set_iface_direction(const char *iface, pcap_t *pcap,
                pcap_direction_t direction)
{
        const char *direction_str = (direction == PCAP_D_IN) ? "IN" : "OUT";
        if (pcap_setdirection(pcap, direction) < 0) {
                PMD_LOG(ERR, "Setting %s pcap direction %s failed - %s\n",
                                iface, direction_str, pcap_geterr(pcap));
                return -1;
        }
        PMD_LOG(INFO, "Setting %s pcap direction %s\n",
                        iface, direction_str);
        return 0;
}

static inline int
open_iface(const char *key, const char *value, void *extra_args)
{
        const char *iface = value;
        struct pmd_devargs *pmd = extra_args;
        pcap_t *pcap = NULL;

        if (open_single_iface(iface, &pcap) < 0)
                return -1;
        if (add_queue(pmd, iface, key, pcap, NULL) < 0) {
                pcap_close(pcap);
                return -1;
        }

        return 0;
}

/*
 * Opens a NIC for reading packets from it
 */
static inline int
open_rx_iface(const char *key, const char *value, void *extra_args)
{
        int ret = open_iface(key, value, extra_args);
        if (ret < 0)
                return ret;
        if (strcmp(key, ETH_PCAP_RX_IFACE_IN_ARG) == 0) {
                struct pmd_devargs *pmd = extra_args;
                unsigned int qid = pmd->num_of_queue - 1;

                set_iface_direction(pmd->queue[qid].name,
                                pmd->queue[qid].pcap,
                                PCAP_D_IN);
        }

        return 0;
}

static inline int
rx_iface_args_process(const char *key, const char *value, void *extra_args)
{
        if (strcmp(key, ETH_PCAP_RX_IFACE_ARG) == 0 ||
                        strcmp(key, ETH_PCAP_RX_IFACE_IN_ARG) == 0)
                return open_rx_iface(key, value, extra_args);

        return 0;
}

/*
 * Opens a NIC for writing packets to it
 */
static int
open_tx_iface(const char *key, const char *value, void *extra_args)
{
        return open_iface(key, value, extra_args);
}

static int
select_phy_mac(const char *key __rte_unused, const char *value,
                void *extra_args)
{
        if (extra_args) {
                const int phy_mac = atoi(value);
                int *enable_phy_mac = extra_args;

                if (phy_mac)
                        *enable_phy_mac = 1;
        }
        return 0;
}

static int
get_infinite_rx_arg(const char *key __rte_unused,
                const char *value, void *extra_args)
{
        if (extra_args) {
                const int infinite_rx = atoi(value);
                int *enable_infinite_rx = extra_args;

                if (infinite_rx > 0)
                        *enable_infinite_rx = 1;
        }
        return 0;
}

static int
pmd_init_internals(struct rte_vdev_device *vdev,
                const unsigned int nb_rx_queues,
                const unsigned int nb_tx_queues,
                struct pmd_internals **internals,
                struct rte_eth_dev **eth_dev)
{
        struct rte_eth_dev_data *data;
        struct pmd_process_private *pp;
        unsigned int numa_node = vdev->device.numa_node;

        PMD_LOG(INFO, "Creating pcap-backed ethdev on numa socket %d",
                numa_node);

        pp = (struct pmd_process_private *)
                rte_zmalloc(NULL, sizeof(struct pmd_process_private),
                                RTE_CACHE_LINE_SIZE);

        if (pp == NULL) {
                PMD_LOG(ERR,
                        "Failed to allocate memory for process private");
                return -1;
        }

        /* reserve an ethdev entry */
        *eth_dev = rte_eth_vdev_allocate(vdev, sizeof(**internals));
        if (!(*eth_dev)) {
                rte_free(pp);
                return -1;
        }
        (*eth_dev)->process_private = pp;
        /* now put it all together
         * - store queue data in internals,
         * - store numa_node info in eth_dev
         * - point eth_dev_data to internals
         * - and point eth_dev structure to new eth_dev_data structure
         */
        *internals = (*eth_dev)->data->dev_private;
        /*
         * Interface MAC = 02:70:63:61:70:<iface_idx>
         * derived from: 'locally administered':'p':'c':'a':'p':'iface_idx'
         * where the middle 4 characters are converted to hex.
         */
        (*internals)->eth_addr = (struct rte_ether_addr) {
                .addr_bytes = { 0x02, 0x70, 0x63, 0x61, 0x70, iface_idx++ }
        };
        (*internals)->phy_mac = 0;
        data = (*eth_dev)->data;
        data->nb_rx_queues = (uint16_t)nb_rx_queues;
        data->nb_tx_queues = (uint16_t)nb_tx_queues;
        data->dev_link = pmd_link;
        data->mac_addrs = &(*internals)->eth_addr;
        data->promiscuous = 1;
        data->all_multicast = 1;
        data->dev_flags |= RTE_ETH_DEV_AUTOFILL_QUEUE_XSTATS;

        /*
         * NOTE: we'll replace the data element, of originally allocated
         * eth_dev so the rings are local per-process
         */
        (*eth_dev)->dev_ops = &ops;

        strlcpy((*internals)->devargs, rte_vdev_device_args(vdev),
                        ETH_PCAP_ARG_MAXLEN);

        return 0;
}

static int
eth_pcap_update_mac(const char *if_name, struct rte_eth_dev *eth_dev,
                const unsigned int numa_node)
{
        void *mac_addrs;
        struct rte_ether_addr mac;

        if (osdep_iface_mac_get(if_name, &mac) < 0)
                return -1;

        mac_addrs = rte_zmalloc_socket(NULL, RTE_ETHER_ADDR_LEN, 0, numa_node);
        if (mac_addrs == NULL)
                return -1;

        PMD_LOG(INFO, "Setting phy MAC for %s", if_name);
        rte_memcpy(mac_addrs, mac.addr_bytes, RTE_ETHER_ADDR_LEN);
        eth_dev->data->mac_addrs = mac_addrs;
        return 0;
}

static int
eth_from_pcaps_common(struct rte_vdev_device *vdev,
                struct pmd_devargs_all *devargs_all,
                struct pmd_internals **internals, struct rte_eth_dev **eth_dev)
{
        struct pmd_process_private *pp;
        struct pmd_devargs *rx_queues = &devargs_all->rx_queues;
        struct pmd_devargs *tx_queues = &devargs_all->tx_queues;
        const unsigned int nb_rx_queues = rx_queues->num_of_queue;
        const unsigned int nb_tx_queues = tx_queues->num_of_queue;
        unsigned int i;

        if (pmd_init_internals(vdev, nb_rx_queues, nb_tx_queues, internals,
                        eth_dev) < 0)
                return -1;

        pp = (*eth_dev)->process_private;
        for (i = 0; i < nb_rx_queues; i++) {
                struct pcap_rx_queue *rx = &(*internals)->rx_queue[i];
                struct devargs_queue *queue = &rx_queues->queue[i];

                pp->rx_pcap[i] = queue->pcap;
                strlcpy(rx->name, queue->name, sizeof(rx->name));
                strlcpy(rx->type, queue->type, sizeof(rx->type));
        }

        for (i = 0; i < nb_tx_queues; i++) {
                struct pcap_tx_queue *tx = &(*internals)->tx_queue[i];
                struct devargs_queue *queue = &tx_queues->queue[i];

                pp->tx_dumper[i] = queue->dumper;
                pp->tx_pcap[i] = queue->pcap;
                strlcpy(tx->name, queue->name, sizeof(tx->name));
                strlcpy(tx->type, queue->type, sizeof(tx->type));
        }

        return 0;
}

static int
eth_from_pcaps(struct rte_vdev_device *vdev,
                struct pmd_devargs_all *devargs_all)
{
        struct pmd_internals *internals = NULL;
        struct rte_eth_dev *eth_dev = NULL;
        struct pmd_devargs *rx_queues = &devargs_all->rx_queues;
        int single_iface = devargs_all->single_iface;
        unsigned int infinite_rx = devargs_all->infinite_rx;
        int ret;

        ret = eth_from_pcaps_common(vdev, devargs_all, &internals, &eth_dev);

        if (ret < 0)
                return ret;

        /* store weather we are using a single interface for rx/tx or not */
        internals->single_iface = single_iface;

        if (single_iface) {
                internals->if_index =
                        osdep_iface_index_get(rx_queues->queue[0].name);

                /* phy_mac arg is applied only only if "iface" devarg is provided */
                if (rx_queues->phy_mac) {
                        if (eth_pcap_update_mac(rx_queues->queue[0].name,
                                        eth_dev, vdev->device.numa_node) == 0)
                                internals->phy_mac = 1;
                }
        }

        internals->infinite_rx = infinite_rx;
        /* Assign rx ops. */
        if (infinite_rx)
                eth_dev->rx_pkt_burst = eth_pcap_rx_infinite;
        else if (devargs_all->is_rx_pcap || devargs_all->is_rx_iface ||
                        single_iface)
                eth_dev->rx_pkt_burst = eth_pcap_rx;
        else
                eth_dev->rx_pkt_burst = eth_null_rx;

        /* Assign tx ops. */
        if (devargs_all->is_tx_pcap)
                eth_dev->tx_pkt_burst = eth_pcap_tx_dumper;
        else if (devargs_all->is_tx_iface || single_iface)
                eth_dev->tx_pkt_burst = eth_pcap_tx;
        else
                eth_dev->tx_pkt_burst = eth_tx_drop;

        rte_eth_dev_probing_finish(eth_dev);
        return 0;
}

static void
eth_release_pcaps(struct pmd_devargs *pcaps,
                struct pmd_devargs *dumpers,
                int single_iface)
{
        unsigned int i;

        if (single_iface) {
                if (pcaps->queue[0].pcap)
                        pcap_close(pcaps->queue[0].pcap);
                return;
        }

        for (i = 0; i < dumpers->num_of_queue; i++) {
                if (dumpers->queue[i].dumper)
                        pcap_dump_close(dumpers->queue[i].dumper);

                if (dumpers->queue[i].pcap)
                        pcap_close(dumpers->queue[i].pcap);
        }

        for (i = 0; i < pcaps->num_of_queue; i++) {
                if (pcaps->queue[i].pcap)
                        pcap_close(pcaps->queue[i].pcap);
        }
}

static int
pmd_pcap_probe(struct rte_vdev_device *dev)
{
        const char *name;
        struct rte_kvargs *kvlist;
        struct pmd_devargs pcaps = {0};
        struct pmd_devargs dumpers = {0};
        struct rte_eth_dev *eth_dev =  NULL;
        struct pmd_internals *internal;
        int ret = 0;

        struct pmd_devargs_all devargs_all = {
                .single_iface = 0,
                .is_tx_pcap = 0,
                .is_tx_iface = 0,
                .infinite_rx = 0,
        };

        name = rte_vdev_device_name(dev);
        PMD_LOG(INFO, "Initializing pmd_pcap for %s", name);

        timespec_get(&start_time, TIME_UTC);
        start_cycles = rte_get_timer_cycles();
        hz = rte_get_timer_hz();

        ret = rte_mbuf_dyn_rx_timestamp_register(&timestamp_dynfield_offset,
                        &timestamp_rx_dynflag);
        if (ret != 0) {
                PMD_LOG(ERR, "Failed to register Rx timestamp field/flag");
                return -1;
        }

        if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
                eth_dev = rte_eth_dev_attach_secondary(name);
                if (!eth_dev) {
                        PMD_LOG(ERR, "Failed to probe %s", name);
                        return -1;
                }

                internal = eth_dev->data->dev_private;

                kvlist = rte_kvargs_parse(internal->devargs, valid_arguments);
                if (kvlist == NULL)
                        return -1;
        } else {
                kvlist = rte_kvargs_parse(rte_vdev_device_args(dev),
                                valid_arguments);
                if (kvlist == NULL)
                        return -1;
        }

        /*
         * If iface argument is passed we open the NICs and use them for
         * reading / writing
         */
        if (rte_kvargs_count(kvlist, ETH_PCAP_IFACE_ARG) == 1) {

                ret = rte_kvargs_process(kvlist, ETH_PCAP_IFACE_ARG,
                                &open_rx_tx_iface, &pcaps);
                if (ret < 0)
                        goto free_kvlist;

                dumpers.queue[0] = pcaps.queue[0];

                ret = rte_kvargs_process(kvlist, ETH_PCAP_PHY_MAC_ARG,
                                &select_phy_mac, &pcaps.phy_mac);
                if (ret < 0)
                        goto free_kvlist;

                dumpers.phy_mac = pcaps.phy_mac;

                devargs_all.single_iface = 1;
                pcaps.num_of_queue = 1;
                dumpers.num_of_queue = 1;

                goto create_eth;
        }

        /*
         * We check whether we want to open a RX stream from a real NIC, a
         * pcap file or open a dummy RX stream
         */
        devargs_all.is_rx_pcap =
                rte_kvargs_count(kvlist, ETH_PCAP_RX_PCAP_ARG) ? 1 : 0;
        devargs_all.is_rx_iface =
                (rte_kvargs_count(kvlist, ETH_PCAP_RX_IFACE_ARG) +
                 rte_kvargs_count(kvlist, ETH_PCAP_RX_IFACE_IN_ARG)) ? 1 : 0;
        pcaps.num_of_queue = 0;

        devargs_all.is_tx_pcap =
                rte_kvargs_count(kvlist, ETH_PCAP_TX_PCAP_ARG) ? 1 : 0;
        devargs_all.is_tx_iface =
                rte_kvargs_count(kvlist, ETH_PCAP_TX_IFACE_ARG) ? 1 : 0;
        dumpers.num_of_queue = 0;

        if (devargs_all.is_rx_pcap) {
                /*
                 * We check whether we want to infinitely rx the pcap file.
                 */
                unsigned int infinite_rx_arg_cnt = rte_kvargs_count(kvlist,
                                ETH_PCAP_INFINITE_RX_ARG);

                if (infinite_rx_arg_cnt == 1) {
                        ret = rte_kvargs_process(kvlist,
                                        ETH_PCAP_INFINITE_RX_ARG,
                                        &get_infinite_rx_arg,
                                        &devargs_all.infinite_rx);
                        if (ret < 0)
                                goto free_kvlist;
                        PMD_LOG(INFO, "infinite_rx has been %s for %s",
                                        devargs_all.infinite_rx ? "enabled" : "disabled",
                                        name);

                } else if (infinite_rx_arg_cnt > 1) {
                        PMD_LOG(WARNING, "infinite_rx has not been enabled since the "
                                        "argument has been provided more than once "
                                        "for %s", name);
                }

                ret = rte_kvargs_process(kvlist, ETH_PCAP_RX_PCAP_ARG,
                                &open_rx_pcap, &pcaps);
        } else if (devargs_all.is_rx_iface) {
                ret = rte_kvargs_process(kvlist, NULL,
                                &rx_iface_args_process, &pcaps);
        } else if (devargs_all.is_tx_iface || devargs_all.is_tx_pcap) {
                unsigned int i;

                /* Count number of tx queue args passed before dummy rx queue
                 * creation so a dummy rx queue can be created for each tx queue
                 */
                unsigned int num_tx_queues =
                        (rte_kvargs_count(kvlist, ETH_PCAP_TX_PCAP_ARG) +
                        rte_kvargs_count(kvlist, ETH_PCAP_TX_IFACE_ARG));

                PMD_LOG(INFO, "Creating null rx queue since no rx queues were provided.");

                /* Creating a dummy rx queue for each tx queue passed */
                for (i = 0; i < num_tx_queues; i++)
                        ret = add_queue(&pcaps, "dummy_rx", "rx_null", NULL,
                                        NULL);
        } else {
                PMD_LOG(ERR, "Error - No rx or tx queues provided");
                ret = -ENOENT;
        }
        if (ret < 0)
                goto free_kvlist;

        /*
         * We check whether we want to open a TX stream to a real NIC,
         * a pcap file, or drop packets on tx
         */
        if (devargs_all.is_tx_pcap) {
                ret = rte_kvargs_process(kvlist, ETH_PCAP_TX_PCAP_ARG,
                                &open_tx_pcap, &dumpers);
        } else if (devargs_all.is_tx_iface) {
                ret = rte_kvargs_process(kvlist, ETH_PCAP_TX_IFACE_ARG,
                                &open_tx_iface, &dumpers);
        } else {
                unsigned int i;

                PMD_LOG(INFO, "Dropping packets on tx since no tx queues were provided.");

                /* Add 1 dummy queue per rxq which counts and drops packets. */
                for (i = 0; i < pcaps.num_of_queue; i++)
                        ret = add_queue(&dumpers, "dummy_tx", "tx_drop", NULL,
                                        NULL);
        }

        if (ret < 0)
                goto free_kvlist;

create_eth:
        if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
                struct pmd_process_private *pp;
                unsigned int i;

                internal = eth_dev->data->dev_private;
                        pp = (struct pmd_process_private *)
                                rte_zmalloc(NULL,
                                        sizeof(struct pmd_process_private),
                                        RTE_CACHE_LINE_SIZE);

                if (pp == NULL) {
                        PMD_LOG(ERR,
                                "Failed to allocate memory for process private");
                        ret = -1;
                        goto free_kvlist;
                }

                eth_dev->dev_ops = &ops;
                eth_dev->device = &dev->device;

                /* setup process private */
                for (i = 0; i < pcaps.num_of_queue; i++)
                        pp->rx_pcap[i] = pcaps.queue[i].pcap;

                for (i = 0; i < dumpers.num_of_queue; i++) {
                        pp->tx_dumper[i] = dumpers.queue[i].dumper;
                        pp->tx_pcap[i] = dumpers.queue[i].pcap;
                }

                eth_dev->process_private = pp;
                eth_dev->rx_pkt_burst = eth_pcap_rx;
                if (devargs_all.is_tx_pcap)
                        eth_dev->tx_pkt_burst = eth_pcap_tx_dumper;
                else
                        eth_dev->tx_pkt_burst = eth_pcap_tx;

                rte_eth_dev_probing_finish(eth_dev);
                goto free_kvlist;
        }

        devargs_all.rx_queues = pcaps;
        devargs_all.tx_queues = dumpers;

        ret = eth_from_pcaps(dev, &devargs_all);

free_kvlist:
        rte_kvargs_free(kvlist);

        if (ret < 0)
                eth_release_pcaps(&pcaps, &dumpers, devargs_all.single_iface);

        return ret;
}

static int
pmd_pcap_remove(struct rte_vdev_device *dev)
{
        struct rte_eth_dev *eth_dev = NULL;

        if (!dev)
                return -1;

        eth_dev = rte_eth_dev_allocated(rte_vdev_device_name(dev));
        if (eth_dev == NULL)
                return 0; /* port already released */

        eth_dev_close(eth_dev);
        rte_eth_dev_release_port(eth_dev);

        return 0;
}

static struct rte_vdev_driver pmd_pcap_drv = {
        .probe = pmd_pcap_probe,
        .remove = pmd_pcap_remove,
};

RTE_PMD_REGISTER_VDEV(net_pcap, pmd_pcap_drv);
RTE_PMD_REGISTER_ALIAS(net_pcap, eth_pcap);
RTE_PMD_REGISTER_PARAM_STRING(net_pcap,
        ETH_PCAP_RX_PCAP_ARG "=<string> "
        ETH_PCAP_TX_PCAP_ARG "=<string> "
        ETH_PCAP_RX_IFACE_ARG "=<ifc> "
        ETH_PCAP_RX_IFACE_IN_ARG "=<ifc> "
        ETH_PCAP_TX_IFACE_ARG "=<ifc> "
        ETH_PCAP_IFACE_ARG "=<ifc> "
        ETH_PCAP_PHY_MAC_ARG "=<int>"
        ETH_PCAP_INFINITE_RX_ARG "=<0|1>");