pktgen.c

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/*
 * Authors:
 * Copyright 2001, 2002 by Robert Olsson <[email protected]>
 *                             Uppsala University and
 *                             Swedish University of Agricultural Sciences
 *
 * Alexey Kuznetsov  <[email protected]>
 * Ben Greear <[email protected]>
 * Jens Låås <[email protected]>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 *
 *
 * A tool for loading the network with preconfigurated packets.
 * The tool is implemented as a linux module.  Parameters are output
 * device, delay (to hard_xmit), number of packets, and whether
 * to use multiple SKBs or just the same one.
 * pktgen uses the installed interface's output routine.
 *
 * Additional hacking by:
 *
 * [email protected]
 * Improved by ANK. 010120.
 * Improved by ANK even more. 010212.
 * MAC address typo fixed. 010417 --ro
 * Integrated.  020301 --DaveM
 * Added multiskb option 020301 --DaveM
 * Scaling of results. [email protected]
 * Significant re-work of the module:
 *   *  Convert to threaded model to more efficiently be able to transmit
 *       and receive on multiple interfaces at once.
 *   *  Converted many counters to __u64 to allow longer runs.
 *   *  Allow configuration of ranges, like min/max IP address, MACs,
 *       and UDP-ports, for both source and destination, and can
 *       set to use a random distribution or sequentially walk the range.
 *   *  Can now change most values after starting.
 *   *  Place 12-byte packet in UDP payload with magic number,
 *       sequence number, and timestamp.
 *   *  Add receiver code that detects dropped pkts, re-ordered pkts, and
 *       latencies (with micro-second) precision.
 *   *  Add IOCTL interface to easily get counters & configuration.
 *   --Ben Greear <[email protected]>
 *
 * Renamed multiskb to clone_skb and cleaned up sending core for two distinct
 * skb modes. A clone_skb=0 mode for Ben "ranges" work and a clone_skb != 0
 * as a "fastpath" with a configurable number of clones after alloc's.
 * clone_skb=0 means all packets are allocated this also means ranges time
 * stamps etc can be used. clone_skb=100 means 1 malloc is followed by 100
 * clones.
 *
 * Also moved to /proc/net/pktgen/
 * --ro
 *
 * Sept 10:  Fixed threading/locking.  Lots of bone-headed and more clever
 *    mistakes.  Also merged in DaveM's patch in the -pre6 patch.
 * --Ben Greear <[email protected]>
 *
 * Integrated to 2.5.x 021029 --Lucio Maciel ([email protected])
 *
 *
 * 021124 Finished major redesign and rewrite for new functionality.
 * See Documentation/networking/pktgen.txt for how to use this.
 *
 * The new operation:
 * For each CPU one thread/process is created at start. This process checks
 * for running devices in the if_list and sends packets until count is 0 it
 * also the thread checks the thread->control which is used for inter-process
 * communication. controlling process "posts" operations to the threads this
 * way. The if_lock should be possible to remove when add/rem_device is merged
 * into this too.
 *
 * By design there should only be *one* "controlling" process. In practice
 * multiple write accesses gives unpredictable result. Understood by "write"
 * to /proc gives result code thats should be read be the "writer".
 * For practical use this should be no problem.
 *
 * Note when adding devices to a specific CPU there good idea to also assign
 * /proc/irq/XX/smp_affinity so TX-interrupts gets bound to the same CPU.
 * --ro
 *
 * Fix refcount off by one if first packet fails, potential null deref,
 * memleak 030710- KJP
 *
 * First "ranges" functionality for ipv6 030726 --ro
 *
 * Included flow support. 030802 ANK.
 *
 * Fixed unaligned access on IA-64 Grant Grundler <[email protected]>
 *
 * Remove if fix from added Harald Welte <[email protected]> 040419
 * ia64 compilation fix from  Aron Griffis <[email protected]> 040604
 *
 * New xmit() return, do_div and misc clean up by Stephen Hemminger
 * <[email protected]> 040923
 *
 * Randy Dunlap fixed u64 printk compiler waring
 *
 * Remove FCS from BW calculation.  Lennert Buytenhek <[email protected]>
 * New time handling. Lennert Buytenhek <[email protected]> 041213
 *
 * Corrections from Nikolai Malykh ([email protected])
 * Removed unused flags F_SET_SRCMAC & F_SET_SRCIP 041230
 *
 * interruptible_sleep_on_timeout() replaced Nishanth Aravamudan <[email protected]>
 * 050103
 *
 * MPLS support by Steven Whitehouse <[email protected]>
 *
 * 802.1Q/Q-in-Q support by Francesco Fondelli (FF) <[email protected]>
 *
 * Fixed src_mac command to set source mac of packet to value specified in
 * command by Adit Ranadive <[email protected]>
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/sys.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/mutex.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/unistd.h>
#include <linux/string.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/capability.h>
#include <linux/hrtimer.h>
#include <linux/freezer.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/list.h>
#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/inet.h>
#include <linux/inetdevice.h>
#include <linux/rtnetlink.h>
#include <linux/if_arp.h>
#include <linux/if_vlan.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/udp.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/wait.h>
#include <linux/etherdevice.h>
#include <linux/kthread.h>
#include <linux/prefetch.h>
#include <net/net_namespace.h>
#include <net/checksum.h>
#include <net/ipv6.h>
#include <net/addrconf.h>
#ifdef CONFIG_XFRM
#include <net/xfrm.h>
#endif
#include <asm/byteorder.h>
#include <linux/rcupdate.h>
#include <linux/bitops.h>
#include <linux/io.h>
#include <linux/timex.h>
#include <linux/uaccess.h>
#include <asm/dma.h>
#include <asm/div64.h>      /* do_div */

#define VERSION "2.74"
#define IP_NAME_SZ 32
#define MAX_MPLS_LABELS 16 /* This is the max label stack depth */
#define MPLS_STACK_BOTTOM htonl(0x00000100)

#define func_enter() pr_debug("entering %s\n", __func__);

/* Device flag bits */
#define F_IPSRC_RND   (1<<0)    /* IP-Src Random  */
#define F_IPDST_RND   (1<<1)    /* IP-Dst Random  */
#define F_UDPSRC_RND  (1<<2)    /* UDP-Src Random */
#define F_UDPDST_RND  (1<<3)    /* UDP-Dst Random */
#define F_MACSRC_RND  (1<<4)    /* MAC-Src Random */
#define F_MACDST_RND  (1<<5)    /* MAC-Dst Random */
#define F_TXSIZE_RND  (1<<6)    /* Transmit size is random */
#define F_IPV6        (1<<7)    /* Interface in IPV6 Mode */
#define F_MPLS_RND    (1<<8)    /* Random MPLS labels */
#define F_VID_RND     (1<<9)    /* Random VLAN ID */
#define F_SVID_RND    (1<<10)   /* Random SVLAN ID */
#define F_FLOW_SEQ    (1<<11)   /* Sequential flows */
#define F_IPSEC_ON    (1<<12)   /* ipsec on for flows */
#define F_QUEUE_MAP_RND (1<<13) /* queue map Random */
#define F_QUEUE_MAP_CPU (1<<14) /* queue map mirrors smp_processor_id() */
#define F_NODE          (1<<15) /* Node memory alloc*/

/* Thread control flag bits */
#define T_STOP        (1<<0)    /* Stop run */
#define T_RUN         (1<<1)    /* Start run */
#define T_REMDEVALL   (1<<2)    /* Remove all devs */
#define T_REMDEV      (1<<3)    /* Remove one dev */

/* If lock -- can be removed after some work */
#define   if_lock(t)           spin_lock(&(t->if_lock));
#define   if_unlock(t)           spin_unlock(&(t->if_lock));

/* Used to help with determining the pkts on receive */
#define PKTGEN_MAGIC 0xbe9be955
#define PG_PROC_DIR "pktgen"
#define PGCTRL      "pgctrl"
static struct proc_dir_entry *pg_proc_dir;

#define MAX_CFLOWS  65536

#define VLAN_TAG_SIZE(x) ((x)->vlan_id == 0xffff ? 0 : 4)
#define SVLAN_TAG_SIZE(x) ((x)->svlan_id == 0xffff ? 0 : 4)

struct flow_state {
    __be32 cur_daddr;
    int count;
#ifdef CONFIG_XFRM
    struct xfrm_state *x;
#endif
    __u32 flags;
};

/* flow flag bits */
#define F_INIT   (1<<0)     /* flow has been initialized */

struct pktgen_dev {
    /*
     * Try to keep frequent/infrequent used vars. separated.
     */
    struct proc_dir_entry *entry;   /* proc file */
    struct pktgen_thread *pg_thread;/* the owner */
    struct list_head list;      /* chaining in the thread's run-queue */

    int running;        /* if false, the test will stop */

    /* If min != max, then we will either do a linear iteration, or
     * we will do a random selection from within the range.
     */
    __u32 flags;
    int removal_mark;   /* non-zero => the device is marked for
                 * removal by worker thread */

    int min_pkt_size;
    int max_pkt_size;
    int pkt_overhead;   /* overhead for MPLS, VLANs, IPSEC etc */
    int nfrags;
    struct page *page;
    u64 delay;      /* nano-seconds */

    __u64 count;        /* Default No packets to send */
    __u64 sofar;        /* How many pkts we've sent so far */
    __u64 tx_bytes;     /* How many bytes we've transmitted */
    __u64 errors;       /* Errors when trying to transmit, */

    /* runtime counters relating to clone_skb */

    __u64 allocated_skbs;
    __u32 clone_count;
    int last_ok;        /* Was last skb sent?
                 * Or a failed transmit of some sort?
                 * This will keep sequence numbers in order
                 */
    ktime_t next_tx;
    ktime_t started_at;
    ktime_t stopped_at;
    u64 idle_acc;   /* nano-seconds */

    __u32 seq_num;

    int clone_skb;      /*
                 * Use multiple SKBs during packet gen.
                 * If this number is greater than 1, then
                 * that many copies of the same packet will be
                 * sent before a new packet is allocated.
                 * If you want to send 1024 identical packets
                 * before creating a new packet,
                 * set clone_skb to 1024.
                 */

    char dst_min[IP_NAME_SZ];   /* IP, ie 1.2.3.4 */
    char dst_max[IP_NAME_SZ];   /* IP, ie 1.2.3.4 */
    char src_min[IP_NAME_SZ];   /* IP, ie 1.2.3.4 */
    char src_max[IP_NAME_SZ];   /* IP, ie 1.2.3.4 */

    struct in6_addr in6_saddr;
    struct in6_addr in6_daddr;
    struct in6_addr cur_in6_daddr;
    struct in6_addr cur_in6_saddr;
    /* For ranges */
    struct in6_addr min_in6_daddr;
    struct in6_addr max_in6_daddr;
    struct in6_addr min_in6_saddr;
    struct in6_addr max_in6_saddr;

    /* If we're doing ranges, random or incremental, then this
     * defines the min/max for those ranges.
     */
    __be32 saddr_min;   /* inclusive, source IP address */
    __be32 saddr_max;   /* exclusive, source IP address */
    __be32 daddr_min;   /* inclusive, dest IP address */
    __be32 daddr_max;   /* exclusive, dest IP address */

    __u16 udp_src_min;  /* inclusive, source UDP port */
    __u16 udp_src_max;  /* exclusive, source UDP port */
    __u16 udp_dst_min;  /* inclusive, dest UDP port */
    __u16 udp_dst_max;  /* exclusive, dest UDP port */

    /* DSCP + ECN */
    __u8 tos;            /* six MSB of (former) IPv4 TOS
                are for dscp codepoint */
    __u8 traffic_class;  /* ditto for the (former) Traffic Class in IPv6
                (see RFC 3260, sec. 4) */

    /* MPLS */
    unsigned int nr_labels; /* Depth of stack, 0 = no MPLS */
    __be32 labels[MAX_MPLS_LABELS];

    /* VLAN/SVLAN (802.1Q/Q-in-Q) */
    __u8  vlan_p;
    __u8  vlan_cfi;
    __u16 vlan_id;  /* 0xffff means no vlan tag */

    __u8  svlan_p;
    __u8  svlan_cfi;
    __u16 svlan_id; /* 0xffff means no svlan tag */

    __u32 src_mac_count;    /* How many MACs to iterate through */
    __u32 dst_mac_count;    /* How many MACs to iterate through */

    unsigned char dst_mac[ETH_ALEN];
    unsigned char src_mac[ETH_ALEN];

    __u32 cur_dst_mac_offset;
    __u32 cur_src_mac_offset;
    __be32 cur_saddr;
    __be32 cur_daddr;
    __u16 ip_id;
    __u16 cur_udp_dst;
    __u16 cur_udp_src;
    __u16 cur_queue_map;
    __u32 cur_pkt_size;
    __u32 last_pkt_size;

    __u8 hh[14];
    /* = {
       0x00, 0x80, 0xC8, 0x79, 0xB3, 0xCB,

       We fill in SRC address later
       0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
       0x08, 0x00
       };
     */
    __u16 pad;      /* pad out the hh struct to an even 16 bytes */

    struct sk_buff *skb;    /* skb we are to transmit next, used for when we
                 * are transmitting the same one multiple times
                 */
    struct net_device *odev; /* The out-going device.
                  * Note that the device should have it's
                  * pg_info pointer pointing back to this
                  * device.
                  * Set when the user specifies the out-going
                  * device name (not when the inject is
                  * started as it used to do.)
                  */
    char odevname[32];
    struct flow_state *flows;
    unsigned int cflows;    /* Concurrent flows (config) */
    unsigned int lflow;     /* Flow length  (config) */
    unsigned int nflows;    /* accumulated flows (stats) */
    unsigned int curfl;     /* current sequenced flow (state)*/

    u16 queue_map_min;
    u16 queue_map_max;
    __u32 skb_priority; /* skb priority field */
    int node;               /* Memory node */

#ifdef CONFIG_XFRM
    __u8    ipsmode;        /* IPSEC mode (config) */
    __u8    ipsproto;       /* IPSEC type (config) */
#endif
    char result[512];
};

struct pktgen_hdr {
    __be32 pgh_magic;
    __be32 seq_num;
    __be32 tv_sec;
    __be32 tv_usec;
};

static bool pktgen_exiting __read_mostly;

struct pktgen_thread {
    spinlock_t if_lock;     /* for list of devices */
    struct list_head if_list;   /* All device here */
    struct list_head th_list;
    struct task_struct *tsk;
    char result[512];

    /* Field for thread to receive "posted" events terminate,
       stop ifs etc. */

    u32 control;
    int cpu;

    wait_queue_head_t queue;
    struct completion start_done;
};

#define REMOVE 1
#define FIND   0

static inline ktime_t ktime_now(void)
{
    struct timespec ts;
    ktime_get_ts(&ts);

    return timespec_to_ktime(ts);
}

/* This works even if 32 bit because of careful byte order choice */
static inline int ktime_lt(const ktime_t cmp1, const ktime_t cmp2)
{
    return cmp1.tv64 < cmp2.tv64;
}

static const char version[] =
    "Packet Generator for packet performance testing. "
    "Version: " VERSION "\n";

static int pktgen_remove_device(struct pktgen_thread *t, struct pktgen_dev *i);
static int pktgen_add_device(struct pktgen_thread *t, const char *ifname);
static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t,
                      const char *ifname, bool exact);
static int pktgen_device_event(struct notifier_block *, unsigned long, void *);
static void pktgen_run_all_threads(void);
static void pktgen_reset_all_threads(void);
static void pktgen_stop_all_threads_ifs(void);

static void pktgen_stop(struct pktgen_thread *t);
static void pktgen_clear_counters(struct pktgen_dev *pkt_dev);

/* Module parameters, defaults. */
static int pg_count_d __read_mostly = 1000;
static int pg_delay_d __read_mostly;
static int pg_clone_skb_d  __read_mostly;
static int debug  __read_mostly;

static DEFINE_MUTEX(pktgen_thread_lock);
static LIST_HEAD(pktgen_threads);

static struct notifier_block pktgen_notifier_block = {
    .notifier_call = pktgen_device_event,
};

/*
 * /proc handling functions
 *
 */

static int pgctrl_show(struct seq_file *seq, void *v)
{
    seq_puts(seq, version);
    return 0;
}

static ssize_t pgctrl_write(struct file *file, const char __user *buf,
                size_t count, loff_t *ppos)
{
    int err = 0;
    char data[128];

    if (!capable(CAP_NET_ADMIN)) {
        err = -EPERM;
        goto out;
    }

    if (count > sizeof(data))
        count = sizeof(data);

    if (copy_from_user(data, buf, count)) {
        err = -EFAULT;
        goto out;
    }
    data[count - 1] = 0;    /* Make string */

    if (!strcmp(data, "stop"))
        pktgen_stop_all_threads_ifs();

    else if (!strcmp(data, "start"))
        pktgen_run_all_threads();

    else if (!strcmp(data, "reset"))
        pktgen_reset_all_threads();

    else
        pr_warning("Unknown command: %s\n", data);

    err = count;

out:
    return err;
}

static int pgctrl_open(struct inode *inode, struct file *file)
{
    return single_open(file, pgctrl_show, PDE(inode)->data);
}

static const struct file_operations pktgen_fops = {
    .owner   = THIS_MODULE,
    .open    = pgctrl_open,
    .read    = seq_read,
    .llseek  = seq_lseek,
    .write   = pgctrl_write,
    .release = single_release,
};

static int pktgen_if_show(struct seq_file *seq, void *v)
{
    const struct pktgen_dev *pkt_dev = seq->private;
    ktime_t stopped;
    u64 idle;

    seq_printf(seq,
           "Params: count %llu  min_pkt_size: %u  max_pkt_size: %u\n",
           (unsigned long long)pkt_dev->count, pkt_dev->min_pkt_size,
           pkt_dev->max_pkt_size);

    seq_printf(seq,
           "     frags: %d  delay: %llu  clone_skb: %d  ifname: %s\n",
           pkt_dev->nfrags, (unsigned long long) pkt_dev->delay,
           pkt_dev->clone_skb, pkt_dev->odevname);

    seq_printf(seq, "     flows: %u flowlen: %u\n", pkt_dev->cflows,
           pkt_dev->lflow);

    seq_printf(seq,
           "     queue_map_min: %u  queue_map_max: %u\n",
           pkt_dev->queue_map_min,
           pkt_dev->queue_map_max);

    if (pkt_dev->skb_priority)
        seq_printf(seq, "     skb_priority: %u\n",
               pkt_dev->skb_priority);

    if (pkt_dev->flags & F_IPV6) {
        seq_printf(seq,
               "     saddr: %pI6c  min_saddr: %pI6c  max_saddr: %pI6c\n"
               "     daddr: %pI6c  min_daddr: %pI6c  max_daddr: %pI6c\n",
               &pkt_dev->in6_saddr,
               &pkt_dev->min_in6_saddr, &pkt_dev->max_in6_saddr,
               &pkt_dev->in6_daddr,
               &pkt_dev->min_in6_daddr, &pkt_dev->max_in6_daddr);
    } else {
        seq_printf(seq,
               "     dst_min: %s  dst_max: %s\n",
               pkt_dev->dst_min, pkt_dev->dst_max);
        seq_printf(seq,
               "        src_min: %s  src_max: %s\n",
               pkt_dev->src_min, pkt_dev->src_max);
    }

    seq_puts(seq, "     src_mac: ");

    seq_printf(seq, "%pM ",
           is_zero_ether_addr(pkt_dev->src_mac) ?
                 pkt_dev->odev->dev_addr : pkt_dev->src_mac);

    seq_printf(seq, "dst_mac: ");
    seq_printf(seq, "%pM\n", pkt_dev->dst_mac);

    seq_printf(seq,
           "     udp_src_min: %d  udp_src_max: %d"
           "  udp_dst_min: %d  udp_dst_max: %d\n",
           pkt_dev->udp_src_min, pkt_dev->udp_src_max,
           pkt_dev->udp_dst_min, pkt_dev->udp_dst_max);

    seq_printf(seq,
           "     src_mac_count: %d  dst_mac_count: %d\n",
           pkt_dev->src_mac_count, pkt_dev->dst_mac_count);

    if (pkt_dev->nr_labels) {
        unsigned int i;
        seq_printf(seq, "     mpls: ");
        for (i = 0; i < pkt_dev->nr_labels; i++)
            seq_printf(seq, "%08x%s", ntohl(pkt_dev->labels[i]),
                   i == pkt_dev->nr_labels-1 ? "\n" : ", ");
    }

    if (pkt_dev->vlan_id != 0xffff)
        seq_printf(seq, "     vlan_id: %u  vlan_p: %u  vlan_cfi: %u\n",
               pkt_dev->vlan_id, pkt_dev->vlan_p,
               pkt_dev->vlan_cfi);

    if (pkt_dev->svlan_id != 0xffff)
        seq_printf(seq, "     svlan_id: %u  vlan_p: %u  vlan_cfi: %u\n",
               pkt_dev->svlan_id, pkt_dev->svlan_p,
               pkt_dev->svlan_cfi);

    if (pkt_dev->tos)
        seq_printf(seq, "     tos: 0x%02x\n", pkt_dev->tos);

    if (pkt_dev->traffic_class)
        seq_printf(seq, "     traffic_class: 0x%02x\n", pkt_dev->traffic_class);

    if (pkt_dev->node >= 0)
        seq_printf(seq, "     node: %d\n", pkt_dev->node);

    seq_printf(seq, "     Flags: ");

    if (pkt_dev->flags & F_IPV6)
        seq_printf(seq, "IPV6  ");

    if (pkt_dev->flags & F_IPSRC_RND)
        seq_printf(seq, "IPSRC_RND  ");

    if (pkt_dev->flags & F_IPDST_RND)
        seq_printf(seq, "IPDST_RND  ");

    if (pkt_dev->flags & F_TXSIZE_RND)
        seq_printf(seq, "TXSIZE_RND  ");

    if (pkt_dev->flags & F_UDPSRC_RND)
        seq_printf(seq, "UDPSRC_RND  ");

    if (pkt_dev->flags & F_UDPDST_RND)
        seq_printf(seq, "UDPDST_RND  ");

    if (pkt_dev->flags & F_MPLS_RND)
        seq_printf(seq,  "MPLS_RND  ");

    if (pkt_dev->flags & F_QUEUE_MAP_RND)
        seq_printf(seq,  "QUEUE_MAP_RND  ");

    if (pkt_dev->flags & F_QUEUE_MAP_CPU)
        seq_printf(seq,  "QUEUE_MAP_CPU  ");

    if (pkt_dev->cflows) {
        if (pkt_dev->flags & F_FLOW_SEQ)
            seq_printf(seq,  "FLOW_SEQ  "); /*in sequence flows*/
        else
            seq_printf(seq,  "FLOW_RND  ");
    }

#ifdef CONFIG_XFRM
    if (pkt_dev->flags & F_IPSEC_ON)
        seq_printf(seq,  "IPSEC  ");
#endif

    if (pkt_dev->flags & F_MACSRC_RND)
        seq_printf(seq, "MACSRC_RND  ");

    if (pkt_dev->flags & F_MACDST_RND)
        seq_printf(seq, "MACDST_RND  ");

    if (pkt_dev->flags & F_VID_RND)
        seq_printf(seq, "VID_RND  ");

    if (pkt_dev->flags & F_SVID_RND)
        seq_printf(seq, "SVID_RND  ");

    if (pkt_dev->flags & F_NODE)
        seq_printf(seq, "NODE_ALLOC  ");

    seq_puts(seq, "\n");

    /* not really stopped, more like last-running-at */
    stopped = pkt_dev->running ? ktime_now() : pkt_dev->stopped_at;
    idle = pkt_dev->idle_acc;
    do_div(idle, NSEC_PER_USEC);

    seq_printf(seq,
           "Current:\n     pkts-sofar: %llu  errors: %llu\n",
           (unsigned long long)pkt_dev->sofar,
           (unsigned long long)pkt_dev->errors);

    seq_printf(seq,
           "     started: %lluus  stopped: %lluus idle: %lluus\n",
           (unsigned long long) ktime_to_us(pkt_dev->started_at),
           (unsigned long long) ktime_to_us(stopped),
           (unsigned long long) idle);

    seq_printf(seq,
           "     seq_num: %d  cur_dst_mac_offset: %d  cur_src_mac_offset: %d\n",
           pkt_dev->seq_num, pkt_dev->cur_dst_mac_offset,
           pkt_dev->cur_src_mac_offset);

    if (pkt_dev->flags & F_IPV6) {
        seq_printf(seq, "     cur_saddr: %pI6c  cur_daddr: %pI6c\n",
                &pkt_dev->cur_in6_saddr,
                &pkt_dev->cur_in6_daddr);
    } else
        seq_printf(seq, "     cur_saddr: %pI4  cur_daddr: %pI4\n",
               &pkt_dev->cur_saddr, &pkt_dev->cur_daddr);

    seq_printf(seq, "     cur_udp_dst: %d  cur_udp_src: %d\n",
           pkt_dev->cur_udp_dst, pkt_dev->cur_udp_src);

    seq_printf(seq, "     cur_queue_map: %u\n", pkt_dev->cur_queue_map);

    seq_printf(seq, "     flows: %u\n", pkt_dev->nflows);

    if (pkt_dev->result[0])
        seq_printf(seq, "Result: %s\n", pkt_dev->result);
    else
        seq_printf(seq, "Result: Idle\n");

    return 0;
}


static int hex32_arg(const char __user *user_buffer, unsigned long maxlen,
             __u32 *num)
{
    int i = 0;
    *num = 0;

    for (; i < maxlen; i++) {
        int value;
        char c;
        *num <<= 4;
        if (get_user(c, &user_buffer[i]))
            return -EFAULT;
        value = hex_to_bin(c);
        if (value >= 0)
            *num |= value;
        else
            break;
    }
    return i;
}

static int count_trail_chars(const char __user * user_buffer,
                 unsigned int maxlen)
{
    int i;

    for (i = 0; i < maxlen; i++) {
        char c;
        if (get_user(c, &user_buffer[i]))
            return -EFAULT;
        switch (c) {
        case '\"':
        case '\n':
        case '\r':
        case '\t':
        case ' ':
        case '=':
            break;
        default:
            goto done;
        }
    }
done:
    return i;
}

static long num_arg(const char __user *user_buffer, unsigned long maxlen,
                unsigned long *num)
{
    int i;
    *num = 0;

    for (i = 0; i < maxlen; i++) {
        char c;
        if (get_user(c, &user_buffer[i]))
            return -EFAULT;
        if ((c >= '0') && (c <= '9')) {
            *num *= 10;
            *num += c - '0';
        } else
            break;
    }
    return i;
}

static int strn_len(const char __user * user_buffer, unsigned int maxlen)
{
    int i;

    for (i = 0; i < maxlen; i++) {
        char c;
        if (get_user(c, &user_buffer[i]))
            return -EFAULT;
        switch (c) {
        case '\"':
        case '\n':
        case '\r':
        case '\t':
        case ' ':
            goto done_str;
            break;
        default:
            break;
        }
    }
done_str:
    return i;
}

static ssize_t get_labels(const char __user *buffer, struct pktgen_dev *pkt_dev)
{
    unsigned int n = 0;
    char c;
    ssize_t i = 0;
    int len;

    pkt_dev->nr_labels = 0;
    do {
        __u32 tmp;
        len = hex32_arg(&buffer[i], 8, &tmp);
        if (len <= 0)
            return len;
        pkt_dev->labels[n] = htonl(tmp);
        if (pkt_dev->labels[n] & MPLS_STACK_BOTTOM)
            pkt_dev->flags |= F_MPLS_RND;
        i += len;
        if (get_user(c, &buffer[i]))
            return -EFAULT;
        i++;
        n++;
        if (n >= MAX_MPLS_LABELS)
            return -E2BIG;
    } while (c == ',');

    pkt_dev->nr_labels = n;
    return i;
}

static ssize_t pktgen_if_write(struct file *file,
                   const char __user * user_buffer, size_t count,
                   loff_t * offset)
{
    struct seq_file *seq = file->private_data;
    struct pktgen_dev *pkt_dev = seq->private;
    int i, max, len;
    char name[16], valstr[32];
    unsigned long value = 0;
    char *pg_result = NULL;
    int tmp = 0;
    char buf[128];

    pg_result = &(pkt_dev->result[0]);

    if (count < 1) {
        pr_warning("wrong command format\n");
        return -EINVAL;
    }

    max = count;
    tmp = count_trail_chars(user_buffer, max);
    if (tmp < 0) {
        pr_warning("illegal format\n");
        return tmp;
    }
    i = tmp;

    /* Read variable name */

    len = strn_len(&user_buffer[i], sizeof(name) - 1);
    if (len < 0)
        return len;

    memset(name, 0, sizeof(name));
    if (copy_from_user(name, &user_buffer[i], len))
        return -EFAULT;
    i += len;

    max = count - i;
    len = count_trail_chars(&user_buffer[i], max);
    if (len < 0)
        return len;

    i += len;

    if (debug) {
        size_t copy = min_t(size_t, count, 1023);
        char tb[copy + 1];
        if (copy_from_user(tb, user_buffer, copy))
            return -EFAULT;
        tb[copy] = 0;
        pr_debug("%s,%lu  buffer -:%s:-\n",
             name, (unsigned long)count, tb);
    }

    if (!strcmp(name, "min_pkt_size")) {
        len = num_arg(&user_buffer[i], 10, &value);
        if (len < 0)
            return len;

        i += len;
        if (value < 14 + 20 + 8)
            value = 14 + 20 + 8;
        if (value != pkt_dev->min_pkt_size) {
            pkt_dev->min_pkt_size = value;
            pkt_dev->cur_pkt_size = value;
        }
        sprintf(pg_result, "OK: min_pkt_size=%u",
            pkt_dev->min_pkt_size);
        return count;
    }

    if (!strcmp(name, "max_pkt_size")) {
        len = num_arg(&user_buffer[i], 10, &value);
        if (len < 0)
            return len;

        i += len;
        if (value < 14 + 20 + 8)
            value = 14 + 20 + 8;
        if (value != pkt_dev->max_pkt_size) {
            pkt_dev->max_pkt_size = value;
            pkt_dev->cur_pkt_size = value;
        }
        sprintf(pg_result, "OK: max_pkt_size=%u",
            pkt_dev->max_pkt_size);
        return count;
    }

    /* Shortcut for min = max */

    if (!strcmp(name, "pkt_size")) {
        len = num_arg(&user_buffer[i], 10, &value);
        if (len < 0)
            return len;

        i += len;
        if (value < 14 + 20 + 8)
            value = 14 + 20 + 8;
        if (value != pkt_dev->min_pkt_size) {
            pkt_dev->min_pkt_size = value;
            pkt_dev->max_pkt_size = value;
            pkt_dev->cur_pkt_size = value;
        }
        sprintf(pg_result, "OK: pkt_size=%u", pkt_dev->min_pkt_size);
        return count;
    }

    if (!strcmp(name, "debug")) {
        len = num_arg(&user_buffer[i], 10, &value);
        if (len < 0)
            return len;

        i += len;
        debug = value;
        sprintf(pg_result, "OK: debug=%u", debug);
        return count;
    }

    if (!strcmp(name, "frags")) {
        len = num_arg(&user_buffer[i], 10, &value);
        if (len < 0)
            return len;

        i += len;
        pkt_dev->nfrags = value;
        sprintf(pg_result, "OK: frags=%u", pkt_dev->nfrags);
        return count;
    }
    if (!strcmp(name, "delay")) {
        len = num_arg(&user_buffer[i], 10, &value);
        if (len < 0)
            return len;

        i += len;
        if (value == 0x7FFFFFFF)
            pkt_dev->delay = ULLONG_MAX;
        else
            pkt_dev->delay = (u64)value;

        sprintf(pg_result, "OK: delay=%llu",
            (unsigned long long) pkt_dev->delay);
        return count;
    }
    if (!strcmp(name, "rate")) {
        len = num_arg(&user_buffer[i], 10, &value);
        if (len < 0)
            return len;

        i += len;
        if (!value)
            return len;
        pkt_dev->delay = pkt_dev->min_pkt_size*8*NSEC_PER_USEC/value;
        if (debug)
            pr_info("Delay set at: %llu ns\n", pkt_dev->delay);

        sprintf(pg_result, "OK: rate=%lu", value);
        return count;
    }
    if (!strcmp(name, "ratep")) {
        len = num_arg(&user_buffer[i], 10, &value);
        if (len < 0)
            return len;

        i += len;
        if (!value)
            return len;
        pkt_dev->delay = NSEC_PER_SEC/value;
        if (debug)
            pr_info("Delay set at: %llu ns\n", pkt_dev->delay);

        sprintf(pg_result, "OK: rate=%lu", value);
        return count;
    }
    if (!strcmp(name, "udp_src_min")) {
        len = num_arg(&user_buffer[i], 10, &value);
        if (len < 0)
            return len;

        i += len;
        if (value != pkt_dev->udp_src_min) {
            pkt_dev->udp_src_min = value;
            pkt_dev->cur_udp_src = value;
        }
        sprintf(pg_result, "OK: udp_src_min=%u", pkt_dev->udp_src_min);
        return count;
    }
    if (!strcmp(name, "udp_dst_min")) {
        len = num_arg(&user_buffer[i], 10, &value);
        if (len < 0)
            return len;

        i += len;
        if (value != pkt_dev->udp_dst_min) {
            pkt_dev->udp_dst_min = value;
            pkt_dev->cur_udp_dst = value;
        }
        sprintf(pg_result, "OK: udp_dst_min=%u", pkt_dev->udp_dst_min);
        return count;
    }
    if (!strcmp(name, "udp_src_max")) {
        len = num_arg(&user_buffer[i], 10, &value);
        if (len < 0)
            return len;

        i += len;
        if (value != pkt_dev->udp_src_max) {
            pkt_dev->udp_src_max = value;
            pkt_dev->cur_udp_src = value;
        }
        sprintf(pg_result, "OK: udp_src_max=%u", pkt_dev->udp_src_max);
        return count;
    }
    if (!strcmp(name, "udp_dst_max")) {
        len = num_arg(&user_buffer[i], 10, &value);
        if (len < 0)
            return len;

        i += len;
        if (value != pkt_dev->udp_dst_max) {
            pkt_dev->udp_dst_max = value;
            pkt_dev->cur_udp_dst = value;
        }
        sprintf(pg_result, "OK: udp_dst_max=%u", pkt_dev->udp_dst_max);
        return count;
    }
    if (!strcmp(name, "clone_skb")) {
        len = num_arg(&user_buffer[i], 10, &value);
        if (len < 0)
            return len;
        if ((value > 0) &&
            (!(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)))
            return -ENOTSUPP;
        i += len;
        pkt_dev->clone_skb = value;

        sprintf(pg_result, "OK: clone_skb=%d", pkt_dev->clone_skb);
        return count;
    }
    if (!strcmp(name, "count")) {
        len = num_arg(&user_buffer[i], 10, &value);
        if (len < 0)
            return len;

        i += len;
        pkt_dev->count = value;
        sprintf(pg_result, "OK: count=%llu",
            (unsigned long long)pkt_dev->count);
        return count;
    }
    if (!strcmp(name, "src_mac_count")) {
        len = num_arg(&user_buffer[i], 10, &value);
        if (len < 0)
            return len;

        i += len;
        if (pkt_dev->src_mac_count != value) {
            pkt_dev->src_mac_count = value;
            pkt_dev->cur_src_mac_offset = 0;
        }
        sprintf(pg_result, "OK: src_mac_count=%d",
            pkt_dev->src_mac_count);
        return count;
    }
    if (!strcmp(name, "dst_mac_count")) {
        len = num_arg(&user_buffer[i], 10, &value);
        if (len < 0)
            return len;

        i += len;
        if (pkt_dev->dst_mac_count != value) {
            pkt_dev->dst_mac_count = value;
            pkt_dev->cur_dst_mac_offset = 0;
        }
        sprintf(pg_result, "OK: dst_mac_count=%d",
            pkt_dev->dst_mac_count);
        return count;
    }
    if (!strcmp(name, "node")) {
        len = num_arg(&user_buffer[i], 10, &value);
        if (len < 0)
            return len;

        i += len;

        if (node_possible(value)) {
            pkt_dev->node = value;
            sprintf(pg_result, "OK: node=%d", pkt_dev->node);
            if (pkt_dev->page) {
                put_page(pkt_dev->page);
                pkt_dev->page = NULL;
            }
        }
        else
            sprintf(pg_result, "ERROR: node not possible");
        return count;
    }
    if (!strcmp(name, "flag")) {
        char f[32];
        memset(f, 0, 32);
        len = strn_len(&user_buffer[i], sizeof(f) - 1);
        if (len < 0)
            return len;

        if (copy_from_user(f, &user_buffer[i], len))
            return -EFAULT;
        i += len;
        if (strcmp(f, "IPSRC_RND") == 0)
            pkt_dev->flags |= F_IPSRC_RND;

        else if (strcmp(f, "!IPSRC_RND") == 0)
            pkt_dev->flags &= ~F_IPSRC_RND;

        else if (strcmp(f, "TXSIZE_RND") == 0)
            pkt_dev->flags |= F_TXSIZE_RND;

        else if (strcmp(f, "!TXSIZE_RND") == 0)
            pkt_dev->flags &= ~F_TXSIZE_RND;

        else if (strcmp(f, "IPDST_RND") == 0)
            pkt_dev->flags |= F_IPDST_RND;

        else if (strcmp(f, "!IPDST_RND") == 0)
            pkt_dev->flags &= ~F_IPDST_RND;

        else if (strcmp(f, "UDPSRC_RND") == 0)
            pkt_dev->flags |= F_UDPSRC_RND;

        else if (strcmp(f, "!UDPSRC_RND") == 0)
            pkt_dev->flags &= ~F_UDPSRC_RND;

        else if (strcmp(f, "UDPDST_RND") == 0)
            pkt_dev->flags |= F_UDPDST_RND;

        else if (strcmp(f, "!UDPDST_RND") == 0)
            pkt_dev->flags &= ~F_UDPDST_RND;

        else if (strcmp(f, "MACSRC_RND") == 0)
            pkt_dev->flags |= F_MACSRC_RND;

        else if (strcmp(f, "!MACSRC_RND") == 0)
            pkt_dev->flags &= ~F_MACSRC_RND;

        else if (strcmp(f, "MACDST_RND") == 0)
            pkt_dev->flags |= F_MACDST_RND;

        else if (strcmp(f, "!MACDST_RND") == 0)
            pkt_dev->flags &= ~F_MACDST_RND;

        else if (strcmp(f, "MPLS_RND") == 0)
            pkt_dev->flags |= F_MPLS_RND;

        else if (strcmp(f, "!MPLS_RND") == 0)
            pkt_dev->flags &= ~F_MPLS_RND;

        else if (strcmp(f, "VID_RND") == 0)
            pkt_dev->flags |= F_VID_RND;

        else if (strcmp(f, "!VID_RND") == 0)
            pkt_dev->flags &= ~F_VID_RND;

        else if (strcmp(f, "SVID_RND") == 0)
            pkt_dev->flags |= F_SVID_RND;

        else if (strcmp(f, "!SVID_RND") == 0)
            pkt_dev->flags &= ~F_SVID_RND;

        else if (strcmp(f, "FLOW_SEQ") == 0)
            pkt_dev->flags |= F_FLOW_SEQ;

        else if (strcmp(f, "QUEUE_MAP_RND") == 0)
            pkt_dev->flags |= F_QUEUE_MAP_RND;

        else if (strcmp(f, "!QUEUE_MAP_RND") == 0)
            pkt_dev->flags &= ~F_QUEUE_MAP_RND;

        else if (strcmp(f, "QUEUE_MAP_CPU") == 0)
            pkt_dev->flags |= F_QUEUE_MAP_CPU;

        else if (strcmp(f, "!QUEUE_MAP_CPU") == 0)
            pkt_dev->flags &= ~F_QUEUE_MAP_CPU;
#ifdef CONFIG_XFRM
        else if (strcmp(f, "IPSEC") == 0)
            pkt_dev->flags |= F_IPSEC_ON;
#endif

        else if (strcmp(f, "!IPV6") == 0)
            pkt_dev->flags &= ~F_IPV6;

        else if (strcmp(f, "NODE_ALLOC") == 0)
            pkt_dev->flags |= F_NODE;

        else if (strcmp(f, "!NODE_ALLOC") == 0)
            pkt_dev->flags &= ~F_NODE;

        else {
            sprintf(pg_result,
                "Flag -:%s:- unknown\nAvailable flags, (prepend ! to un-set flag):\n%s",
                f,
                "IPSRC_RND, IPDST_RND, UDPSRC_RND, UDPDST_RND, "
                "MACSRC_RND, MACDST_RND, TXSIZE_RND, IPV6, MPLS_RND, VID_RND, SVID_RND, FLOW_SEQ, IPSEC, NODE_ALLOC\n");
            return count;
        }
        sprintf(pg_result, "OK: flags=0x%x", pkt_dev->flags);
        return count;
    }
    if (!strcmp(name, "dst_min") || !strcmp(name, "dst")) {
        len = strn_len(&user_buffer[i], sizeof(pkt_dev->dst_min) - 1);
        if (len < 0)
            return len;

        if (copy_from_user(buf, &user_buffer[i], len))
            return -EFAULT;
        buf[len] = 0;
        if (strcmp(buf, pkt_dev->dst_min) != 0) {
            memset(pkt_dev->dst_min, 0, sizeof(pkt_dev->dst_min));
            strncpy(pkt_dev->dst_min, buf, len);
            pkt_dev->daddr_min = in_aton(pkt_dev->dst_min);
            pkt_dev->cur_daddr = pkt_dev->daddr_min;
        }
        if (debug)
            pr_debug("dst_min set to: %s\n", pkt_dev->dst_min);
        i += len;
        sprintf(pg_result, "OK: dst_min=%s", pkt_dev->dst_min);
        return count;
    }
    if (!strcmp(name, "dst_max")) {
        len = strn_len(&user_buffer[i], sizeof(pkt_dev->dst_max) - 1);
        if (len < 0)
            return len;


        if (copy_from_user(buf, &user_buffer[i], len))
            return -EFAULT;

        buf[len] = 0;
        if (strcmp(buf, pkt_dev->dst_max) != 0) {
            memset(pkt_dev->dst_max, 0, sizeof(pkt_dev->dst_max));
            strncpy(pkt_dev->dst_max, buf, len);
            pkt_dev->daddr_max = in_aton(pkt_dev->dst_max);
            pkt_dev->cur_daddr = pkt_dev->daddr_max;
        }
        if (debug)
            pr_debug("dst_max set to: %s\n", pkt_dev->dst_max);
        i += len;
        sprintf(pg_result, "OK: dst_max=%s", pkt_dev->dst_max);
        return count;
    }
    if (!strcmp(name, "dst6")) {
        len = strn_len(&user_buffer[i], sizeof(buf) - 1);
        if (len < 0)
            return len;

        pkt_dev->flags |= F_IPV6;

        if (copy_from_user(buf, &user_buffer[i], len))
            return -EFAULT;
        buf[len] = 0;

        in6_pton(buf, -1, pkt_dev->in6_daddr.s6_addr, -1, NULL);
        snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->in6_daddr);

        pkt_dev->cur_in6_daddr = pkt_dev->in6_daddr;

        if (debug)
            pr_debug("dst6 set to: %s\n", buf);

        i += len;
        sprintf(pg_result, "OK: dst6=%s", buf);
        return count;
    }
    if (!strcmp(name, "dst6_min")) {
        len = strn_len(&user_buffer[i], sizeof(buf) - 1);
        if (len < 0)
            return len;

        pkt_dev->flags |= F_IPV6;

        if (copy_from_user(buf, &user_buffer[i], len))
            return -EFAULT;
        buf[len] = 0;

        in6_pton(buf, -1, pkt_dev->min_in6_daddr.s6_addr, -1, NULL);
        snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->min_in6_daddr);

        pkt_dev->cur_in6_daddr = pkt_dev->min_in6_daddr;
        if (debug)
            pr_debug("dst6_min set to: %s\n", buf);

        i += len;
        sprintf(pg_result, "OK: dst6_min=%s", buf);
        return count;
    }
    if (!strcmp(name, "dst6_max")) {
        len = strn_len(&user_buffer[i], sizeof(buf) - 1);
        if (len < 0)
            return len;

        pkt_dev->flags |= F_IPV6;

        if (copy_from_user(buf, &user_buffer[i], len))
            return -EFAULT;
        buf[len] = 0;

        in6_pton(buf, -1, pkt_dev->max_in6_daddr.s6_addr, -1, NULL);
        snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->max_in6_daddr);

        if (debug)
            pr_debug("dst6_max set to: %s\n", buf);

        i += len;
        sprintf(pg_result, "OK: dst6_max=%s", buf);
        return count;
    }
    if (!strcmp(name, "src6")) {
        len = strn_len(&user_buffer[i], sizeof(buf) - 1);
        if (len < 0)
            return len;

        pkt_dev->flags |= F_IPV6;

        if (copy_from_user(buf, &user_buffer[i], len))
            return -EFAULT;
        buf[len] = 0;

        in6_pton(buf, -1, pkt_dev->in6_saddr.s6_addr, -1, NULL);
        snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->in6_saddr);

        pkt_dev->cur_in6_saddr = pkt_dev->in6_saddr;

        if (debug)
            pr_debug("src6 set to: %s\n", buf);

        i += len;
        sprintf(pg_result, "OK: src6=%s", buf);
        return count;
    }
    if (!strcmp(name, "src_min")) {
        len = strn_len(&user_buffer[i], sizeof(pkt_dev->src_min) - 1);
        if (len < 0)
            return len;

        if (copy_from_user(buf, &user_buffer[i], len))
            return -EFAULT;
        buf[len] = 0;
        if (strcmp(buf, pkt_dev->src_min) != 0) {
            memset(pkt_dev->src_min, 0, sizeof(pkt_dev->src_min));
            strncpy(pkt_dev->src_min, buf, len);
            pkt_dev->saddr_min = in_aton(pkt_dev->src_min);
            pkt_dev->cur_saddr = pkt_dev->saddr_min;
        }
        if (debug)
            pr_debug("src_min set to: %s\n", pkt_dev->src_min);
        i += len;
        sprintf(pg_result, "OK: src_min=%s", pkt_dev->src_min);
        return count;
    }
    if (!strcmp(name, "src_max")) {
        len = strn_len(&user_buffer[i], sizeof(pkt_dev->src_max) - 1);
        if (len < 0)
            return len;

        if (copy_from_user(buf, &user_buffer[i], len))
            return -EFAULT;
        buf[len] = 0;
        if (strcmp(buf, pkt_dev->src_max) != 0) {
            memset(pkt_dev->src_max, 0, sizeof(pkt_dev->src_max));
            strncpy(pkt_dev->src_max, buf, len);
            pkt_dev->saddr_max = in_aton(pkt_dev->src_max);
            pkt_dev->cur_saddr = pkt_dev->saddr_max;
        }
        if (debug)
            pr_debug("src_max set to: %s\n", pkt_dev->src_max);
        i += len;
        sprintf(pg_result, "OK: src_max=%s", pkt_dev->src_max);
        return count;
    }
    if (!strcmp(name, "dst_mac")) {
        len = strn_len(&user_buffer[i], sizeof(valstr) - 1);
        if (len < 0)
            return len;

        memset(valstr, 0, sizeof(valstr));
        if (copy_from_user(valstr, &user_buffer[i], len))
            return -EFAULT;

        if (!mac_pton(valstr, pkt_dev->dst_mac))
            return -EINVAL;
        /* Set up Dest MAC */
        memcpy(&pkt_dev->hh[0], pkt_dev->dst_mac, ETH_ALEN);

        sprintf(pg_result, "OK: dstmac %pM", pkt_dev->dst_mac);
        return count;
    }
    if (!strcmp(name, "src_mac")) {
        len = strn_len(&user_buffer[i], sizeof(valstr) - 1);
        if (len < 0)
            return len;

        memset(valstr, 0, sizeof(valstr));
        if (copy_from_user(valstr, &user_buffer[i], len))
            return -EFAULT;

        if (!mac_pton(valstr, pkt_dev->src_mac))
            return -EINVAL;
        /* Set up Src MAC */
        memcpy(&pkt_dev->hh[6], pkt_dev->src_mac, ETH_ALEN);

        sprintf(pg_result, "OK: srcmac %pM", pkt_dev->src_mac);
        return count;
    }

    if (!strcmp(name, "clear_counters")) {
        pktgen_clear_counters(pkt_dev);
        sprintf(pg_result, "OK: Clearing counters.\n");
        return count;
    }

    if (!strcmp(name, "flows")) {
        len = num_arg(&user_buffer[i], 10, &value);
        if (len < 0)
            return len;

        i += len;
        if (value > MAX_CFLOWS)
            value = MAX_CFLOWS;

        pkt_dev->cflows = value;
        sprintf(pg_result, "OK: flows=%u", pkt_dev->cflows);
        return count;
    }

    if (!strcmp(name, "flowlen")) {
        len = num_arg(&user_buffer[i], 10, &value);
        if (len < 0)
            return len;

        i += len;
        pkt_dev->lflow = value;
        sprintf(pg_result, "OK: flowlen=%u", pkt_dev->lflow);
        return count;
    }

    if (!strcmp(name, "queue_map_min")) {
        len = num_arg(&user_buffer[i], 5, &value);
        if (len < 0)
            return len;

        i += len;
        pkt_dev->queue_map_min = value;
        sprintf(pg_result, "OK: queue_map_min=%u", pkt_dev->queue_map_min);
        return count;
    }

    if (!strcmp(name, "queue_map_max")) {
        len = num_arg(&user_buffer[i], 5, &value);
        if (len < 0)
            return len;

        i += len;
        pkt_dev->queue_map_max = value;
        sprintf(pg_result, "OK: queue_map_max=%u", pkt_dev->queue_map_max);
        return count;
    }

    if (!strcmp(name, "mpls")) {
        unsigned int n, cnt;

        len = get_labels(&user_buffer[i], pkt_dev);
        if (len < 0)
            return len;
        i += len;
        cnt = sprintf(pg_result, "OK: mpls=");
        for (n = 0; n < pkt_dev->nr_labels; n++)
            cnt += sprintf(pg_result + cnt,
                       "%08x%s", ntohl(pkt_dev->labels[n]),
                       n == pkt_dev->nr_labels-1 ? "" : ",");

        if (pkt_dev->nr_labels && pkt_dev->vlan_id != 0xffff) {
            pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */
            pkt_dev->svlan_id = 0xffff;

            if (debug)
                pr_debug("VLAN/SVLAN auto turned off\n");
        }
        return count;
    }

    if (!strcmp(name, "vlan_id")) {
        len = num_arg(&user_buffer[i], 4, &value);
        if (len < 0)
            return len;

        i += len;
        if (value <= 4095) {
            pkt_dev->vlan_id = value;  /* turn on VLAN */

            if (debug)
                pr_debug("VLAN turned on\n");

            if (debug && pkt_dev->nr_labels)
                pr_debug("MPLS auto turned off\n");

            pkt_dev->nr_labels = 0;    /* turn off MPLS */
            sprintf(pg_result, "OK: vlan_id=%u", pkt_dev->vlan_id);
        } else {
            pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */
            pkt_dev->svlan_id = 0xffff;

            if (debug)
                pr_debug("VLAN/SVLAN turned off\n");
        }
        return count;
    }

    if (!strcmp(name, "vlan_p")) {
        len = num_arg(&user_buffer[i], 1, &value);
        if (len < 0)
            return len;

        i += len;
        if ((value <= 7) && (pkt_dev->vlan_id != 0xffff)) {
            pkt_dev->vlan_p = value;
            sprintf(pg_result, "OK: vlan_p=%u", pkt_dev->vlan_p);
        } else {
            sprintf(pg_result, "ERROR: vlan_p must be 0-7");
        }
        return count;
    }

    if (!strcmp(name, "vlan_cfi")) {
        len = num_arg(&user_buffer[i], 1, &value);
        if (len < 0)
            return len;

        i += len;
        if ((value <= 1) && (pkt_dev->vlan_id != 0xffff)) {
            pkt_dev->vlan_cfi = value;
            sprintf(pg_result, "OK: vlan_cfi=%u", pkt_dev->vlan_cfi);
        } else {
            sprintf(pg_result, "ERROR: vlan_cfi must be 0-1");
        }
        return count;
    }

    if (!strcmp(name, "svlan_id")) {
        len = num_arg(&user_buffer[i], 4, &value);
        if (len < 0)
            return len;

        i += len;
        if ((value <= 4095) && ((pkt_dev->vlan_id != 0xffff))) {
            pkt_dev->svlan_id = value;  /* turn on SVLAN */

            if (debug)
                pr_debug("SVLAN turned on\n");

            if (debug && pkt_dev->nr_labels)
                pr_debug("MPLS auto turned off\n");

            pkt_dev->nr_labels = 0;    /* turn off MPLS */
            sprintf(pg_result, "OK: svlan_id=%u", pkt_dev->svlan_id);
        } else {
            pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */
            pkt_dev->svlan_id = 0xffff;

            if (debug)
                pr_debug("VLAN/SVLAN turned off\n");
        }
        return count;
    }

    if (!strcmp(name, "svlan_p")) {
        len = num_arg(&user_buffer[i], 1, &value);
        if (len < 0)
            return len;

        i += len;
        if ((value <= 7) && (pkt_dev->svlan_id != 0xffff)) {
            pkt_dev->svlan_p = value;
            sprintf(pg_result, "OK: svlan_p=%u", pkt_dev->svlan_p);
        } else {
            sprintf(pg_result, "ERROR: svlan_p must be 0-7");
        }
        return count;
    }

    if (!strcmp(name, "svlan_cfi")) {
        len = num_arg(&user_buffer[i], 1, &value);
        if (len < 0)
            return len;

        i += len;
        if ((value <= 1) && (pkt_dev->svlan_id != 0xffff)) {
            pkt_dev->svlan_cfi = value;
            sprintf(pg_result, "OK: svlan_cfi=%u", pkt_dev->svlan_cfi);
        } else {
            sprintf(pg_result, "ERROR: svlan_cfi must be 0-1");
        }
        return count;
    }

    if (!strcmp(name, "tos")) {
        __u32 tmp_value = 0;
        len = hex32_arg(&user_buffer[i], 2, &tmp_value);
        if (len < 0)
            return len;

        i += len;
        if (len == 2) {
            pkt_dev->tos = tmp_value;
            sprintf(pg_result, "OK: tos=0x%02x", pkt_dev->tos);
        } else {
            sprintf(pg_result, "ERROR: tos must be 00-ff");
        }
        return count;
    }

    if (!strcmp(name, "traffic_class")) {
        __u32 tmp_value = 0;
        len = hex32_arg(&user_buffer[i], 2, &tmp_value);
        if (len < 0)
            return len;

        i += len;
        if (len == 2) {
            pkt_dev->traffic_class = tmp_value;
            sprintf(pg_result, "OK: traffic_class=0x%02x", pkt_dev->traffic_class);
        } else {
            sprintf(pg_result, "ERROR: traffic_class must be 00-ff");
        }
        return count;
    }

    if (!strcmp(name, "skb_priority")) {
        len = num_arg(&user_buffer[i], 9, &value);
        if (len < 0)
            return len;

        i += len;
        pkt_dev->skb_priority = value;
        sprintf(pg_result, "OK: skb_priority=%i",
            pkt_dev->skb_priority);
        return count;
    }

    sprintf(pkt_dev->result, "No such parameter \"%s\"", name);
    return -EINVAL;
}

static int pktgen_if_open(struct inode *inode, struct file *file)
{
    return single_open(file, pktgen_if_show, PDE(inode)->data);
}

static const struct file_operations pktgen_if_fops = {
    .owner   = THIS_MODULE,
    .open    = pktgen_if_open,
    .read    = seq_read,
    .llseek  = seq_lseek,
    .write   = pktgen_if_write,
    .release = single_release,
};

static int pktgen_thread_show(struct seq_file *seq, void *v)
{
    struct pktgen_thread *t = seq->private;
    const struct pktgen_dev *pkt_dev;

    BUG_ON(!t);

    seq_printf(seq, "Running: ");

    if_lock(t);
    list_for_each_entry(pkt_dev, &t->if_list, list)
        if (pkt_dev->running)
            seq_printf(seq, "%s ", pkt_dev->odevname);

    seq_printf(seq, "\nStopped: ");

    list_for_each_entry(pkt_dev, &t->if_list, list)
        if (!pkt_dev->running)
            seq_printf(seq, "%s ", pkt_dev->odevname);

    if (t->result[0])
        seq_printf(seq, "\nResult: %s\n", t->result);
    else
        seq_printf(seq, "\nResult: NA\n");

    if_unlock(t);

    return 0;
}

static ssize_t pktgen_thread_write(struct file *file,
                   const char __user * user_buffer,
                   size_t count, loff_t * offset)
{
    struct seq_file *seq = file->private_data;
    struct pktgen_thread *t = seq->private;
    int i, max, len, ret;
    char name[40];
    char *pg_result;

    if (count < 1) {
        //      sprintf(pg_result, "Wrong command format");
        return -EINVAL;
    }

    max = count;
    len = count_trail_chars(user_buffer, max);
    if (len < 0)
        return len;

    i = len;

    /* Read variable name */

    len = strn_len(&user_buffer[i], sizeof(name) - 1);
    if (len < 0)
        return len;

    memset(name, 0, sizeof(name));
    if (copy_from_user(name, &user_buffer[i], len))
        return -EFAULT;
    i += len;

    max = count - i;
    len = count_trail_chars(&user_buffer[i], max);
    if (len < 0)
        return len;

    i += len;

    if (debug)
        pr_debug("t=%s, count=%lu\n", name, (unsigned long)count);

    if (!t) {
        pr_err("ERROR: No thread\n");
        ret = -EINVAL;
        goto out;
    }

    pg_result = &(t->result[0]);

    if (!strcmp(name, "add_device")) {
        char f[32];
        memset(f, 0, 32);
        len = strn_len(&user_buffer[i], sizeof(f) - 1);
        if (len < 0) {
            ret = len;
            goto out;
        }
        if (copy_from_user(f, &user_buffer[i], len))
            return -EFAULT;
        i += len;
        mutex_lock(&pktgen_thread_lock);
        pktgen_add_device(t, f);
        mutex_unlock(&pktgen_thread_lock);
        ret = count;
        sprintf(pg_result, "OK: add_device=%s", f);
        goto out;
    }

    if (!strcmp(name, "rem_device_all")) {
        mutex_lock(&pktgen_thread_lock);
        t->control |= T_REMDEVALL;
        mutex_unlock(&pktgen_thread_lock);
        schedule_timeout_interruptible(msecs_to_jiffies(125));  /* Propagate thread->control  */
        ret = count;
        sprintf(pg_result, "OK: rem_device_all");
        goto out;
    }

    if (!strcmp(name, "max_before_softirq")) {
        sprintf(pg_result, "OK: Note! max_before_softirq is obsoleted -- Do not use");
        ret = count;
        goto out;
    }

    ret = -EINVAL;
out:
    return ret;
}

static int pktgen_thread_open(struct inode *inode, struct file *file)
{
    return single_open(file, pktgen_thread_show, PDE(inode)->data);
}

static const struct file_operations pktgen_thread_fops = {
    .owner   = THIS_MODULE,
    .open    = pktgen_thread_open,
    .read    = seq_read,
    .llseek  = seq_lseek,
    .write   = pktgen_thread_write,
    .release = single_release,
};

/* Think find or remove for NN */
static struct pktgen_dev *__pktgen_NN_threads(const char *ifname, int remove)
{
    struct pktgen_thread *t;
    struct pktgen_dev *pkt_dev = NULL;
    bool exact = (remove == FIND);

    list_for_each_entry(t, &pktgen_threads, th_list) {
        pkt_dev = pktgen_find_dev(t, ifname, exact);
        if (pkt_dev) {
            if (remove) {
                if_lock(t);
                pkt_dev->removal_mark = 1;
                t->control |= T_REMDEV;
                if_unlock(t);
            }
            break;
        }
    }
    return pkt_dev;
}

/*
 * mark a device for removal
 */
static void pktgen_mark_device(const char *ifname)
{
    struct pktgen_dev *pkt_dev = NULL;
    const int max_tries = 10, msec_per_try = 125;
    int i = 0;

    mutex_lock(&pktgen_thread_lock);
    pr_debug("%s: marking %s for removal\n", __func__, ifname);

    while (1) {

        pkt_dev = __pktgen_NN_threads(ifname, REMOVE);
        if (pkt_dev == NULL)
            break;  /* success */

        mutex_unlock(&pktgen_thread_lock);
        pr_debug("%s: waiting for %s to disappear....\n",
             __func__, ifname);
        schedule_timeout_interruptible(msecs_to_jiffies(msec_per_try));
        mutex_lock(&pktgen_thread_lock);

        if (++i >= max_tries) {
            pr_err("%s: timed out after waiting %d msec for device %s to be removed\n",
                   __func__, msec_per_try * i, ifname);
            break;
        }

    }

    mutex_unlock(&pktgen_thread_lock);
}

static void pktgen_change_name(struct net_device *dev)
{
    struct pktgen_thread *t;

    list_for_each_entry(t, &pktgen_threads, th_list) {
        struct pktgen_dev *pkt_dev;

        list_for_each_entry(pkt_dev, &t->if_list, list) {
            if (pkt_dev->odev != dev)
                continue;

            remove_proc_entry(pkt_dev->entry->name, pg_proc_dir);

            pkt_dev->entry = proc_create_data(dev->name, 0600,
                              pg_proc_dir,
                              &pktgen_if_fops,
                              pkt_dev);
            if (!pkt_dev->entry)
                pr_err("can't move proc entry for '%s'\n",
                       dev->name);
            break;
        }
    }
}

static int pktgen_device_event(struct notifier_block *unused,
                   unsigned long event, void *ptr)
{
    struct net_device *dev = ptr;

    if (!net_eq(dev_net(dev), &init_net) || pktgen_exiting)
        return NOTIFY_DONE;

    /* It is OK that we do not hold the group lock right now,
     * as we run under the RTNL lock.
     */

    switch (event) {
    case NETDEV_CHANGENAME:
        pktgen_change_name(dev);
        break;

    case NETDEV_UNREGISTER:
        pktgen_mark_device(dev->name);
        break;
    }

    return NOTIFY_DONE;
}

static struct net_device *pktgen_dev_get_by_name(struct pktgen_dev *pkt_dev,
                         const char *ifname)
{
    char b[IFNAMSIZ+5];
    int i;

    for (i = 0; ifname[i] != '@'; i++) {
        if (i == IFNAMSIZ)
            break;

        b[i] = ifname[i];
    }
    b[i] = 0;

    return dev_get_by_name(&init_net, b);
}


/* Associate pktgen_dev with a device. */

static int pktgen_setup_dev(struct pktgen_dev *pkt_dev, const char *ifname)
{
    struct net_device *odev;
    int err;

    /* Clean old setups */
    if (pkt_dev->odev) {
        dev_put(pkt_dev->odev);
        pkt_dev->odev = NULL;
    }

    odev = pktgen_dev_get_by_name(pkt_dev, ifname);
    if (!odev) {
        pr_err("no such netdevice: \"%s\"\n", ifname);
        return -ENODEV;
    }

    if (odev->type != ARPHRD_ETHER) {
        pr_err("not an ethernet device: \"%s\"\n", ifname);
        err = -EINVAL;
    } else if (!netif_running(odev)) {
        pr_err("device is down: \"%s\"\n", ifname);
        err = -ENETDOWN;
    } else {
        pkt_dev->odev = odev;
        return 0;
    }

    dev_put(odev);
    return err;
}

/* Read pkt_dev from the interface and set up internal pktgen_dev
 * structure to have the right information to create/send packets
 */
static void pktgen_setup_inject(struct pktgen_dev *pkt_dev)
{
    int ntxq;

    if (!pkt_dev->odev) {
        pr_err("ERROR: pkt_dev->odev == NULL in setup_inject\n");
        sprintf(pkt_dev->result,
            "ERROR: pkt_dev->odev == NULL in setup_inject.\n");
        return;
    }

    /* make sure that we don't pick a non-existing transmit queue */
    ntxq = pkt_dev->odev->real_num_tx_queues;

    if (ntxq <= pkt_dev->queue_map_min) {
        pr_warning("WARNING: Requested queue_map_min (zero-based) (%d) exceeds valid range [0 - %d] for (%d) queues on %s, resetting\n",
               pkt_dev->queue_map_min, (ntxq ?: 1) - 1, ntxq,
               pkt_dev->odevname);
        pkt_dev->queue_map_min = (ntxq ?: 1) - 1;
    }
    if (pkt_dev->queue_map_max >= ntxq) {
        pr_warning("WARNING: Requested queue_map_max (zero-based) (%d) exceeds valid range [0 - %d] for (%d) queues on %s, resetting\n",
               pkt_dev->queue_map_max, (ntxq ?: 1) - 1, ntxq,
               pkt_dev->odevname);
        pkt_dev->queue_map_max = (ntxq ?: 1) - 1;
    }

    /* Default to the interface's mac if not explicitly set. */

    if (is_zero_ether_addr(pkt_dev->src_mac))
        memcpy(&(pkt_dev->hh[6]), pkt_dev->odev->dev_addr, ETH_ALEN);

    /* Set up Dest MAC */
    memcpy(&(pkt_dev->hh[0]), pkt_dev->dst_mac, ETH_ALEN);

    if (pkt_dev->flags & F_IPV6) {
        int i, set = 0, err = 1;
        struct inet6_dev *idev;

        if (pkt_dev->min_pkt_size == 0) {
            pkt_dev->min_pkt_size = 14 + sizeof(struct ipv6hdr)
                        + sizeof(struct udphdr)
                        + sizeof(struct pktgen_hdr)
                        + pkt_dev->pkt_overhead;
        }

        for (i = 0; i < IN6_ADDR_HSIZE; i++)
            if (pkt_dev->cur_in6_saddr.s6_addr[i]) {
                set = 1;
                break;
            }

        if (!set) {

            /*
             * Use linklevel address if unconfigured.
             *
             * use ipv6_get_lladdr if/when it's get exported
             */

            rcu_read_lock();
            idev = __in6_dev_get(pkt_dev->odev);
            if (idev) {
                struct inet6_ifaddr *ifp;

                read_lock_bh(&idev->lock);
                list_for_each_entry(ifp, &idev->addr_list, if_list) {
                    if ((ifp->scope & IFA_LINK) &&
                        !(ifp->flags & IFA_F_TENTATIVE)) {
                        pkt_dev->cur_in6_saddr = ifp->addr;
                        err = 0;
                        break;
                    }
                }
                read_unlock_bh(&idev->lock);
            }
            rcu_read_unlock();
            if (err)
                pr_err("ERROR: IPv6 link address not available\n");
        }
    } else {
        if (pkt_dev->min_pkt_size == 0) {
            pkt_dev->min_pkt_size = 14 + sizeof(struct iphdr)
                        + sizeof(struct udphdr)
                        + sizeof(struct pktgen_hdr)
                        + pkt_dev->pkt_overhead;
        }

        pkt_dev->saddr_min = 0;
        pkt_dev->saddr_max = 0;
        if (strlen(pkt_dev->src_min) == 0) {

            struct in_device *in_dev;

            rcu_read_lock();
            in_dev = __in_dev_get_rcu(pkt_dev->odev);
            if (in_dev) {
                if (in_dev->ifa_list) {
                    pkt_dev->saddr_min =
                        in_dev->ifa_list->ifa_address;
                    pkt_dev->saddr_max = pkt_dev->saddr_min;
                }
            }
            rcu_read_unlock();
        } else {
            pkt_dev->saddr_min = in_aton(pkt_dev->src_min);
            pkt_dev->saddr_max = in_aton(pkt_dev->src_max);
        }

        pkt_dev->daddr_min = in_aton(pkt_dev->dst_min);
        pkt_dev->daddr_max = in_aton(pkt_dev->dst_max);
    }
    /* Initialize current values. */
    pkt_dev->cur_pkt_size = pkt_dev->min_pkt_size;
    if (pkt_dev->min_pkt_size > pkt_dev->max_pkt_size)
        pkt_dev->max_pkt_size = pkt_dev->min_pkt_size;

    pkt_dev->cur_dst_mac_offset = 0;
    pkt_dev->cur_src_mac_offset = 0;
    pkt_dev->cur_saddr = pkt_dev->saddr_min;
    pkt_dev->cur_daddr = pkt_dev->daddr_min;
    pkt_dev->cur_udp_dst = pkt_dev->udp_dst_min;
    pkt_dev->cur_udp_src = pkt_dev->udp_src_min;
    pkt_dev->nflows = 0;
}


static void spin(struct pktgen_dev *pkt_dev, ktime_t spin_until)
{
    ktime_t start_time, end_time;
    s64 remaining;
    struct hrtimer_sleeper t;

    hrtimer_init_on_stack(&t.timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
    hrtimer_set_expires(&t.timer, spin_until);

    remaining = ktime_to_ns(hrtimer_expires_remaining(&t.timer));
    if (remaining <= 0) {
        pkt_dev->next_tx = ktime_add_ns(spin_until, pkt_dev->delay);
        return;
    }

    start_time = ktime_now();
    if (remaining < 100000) {
        /* for small delays (<100us), just loop until limit is reached */
        do {
            end_time = ktime_now();
        } while (ktime_lt(end_time, spin_until));
    } else {
        /* see do_nanosleep */
        hrtimer_init_sleeper(&t, current);
        do {
            set_current_state(TASK_INTERRUPTIBLE);
            hrtimer_start_expires(&t.timer, HRTIMER_MODE_ABS);
            if (!hrtimer_active(&t.timer))
                t.task = NULL;

            if (likely(t.task))
                schedule();

            hrtimer_cancel(&t.timer);
        } while (t.task && pkt_dev->running && !signal_pending(current));
        __set_current_state(TASK_RUNNING);
        end_time = ktime_now();
    }

    pkt_dev->idle_acc += ktime_to_ns(ktime_sub(end_time, start_time));
    pkt_dev->next_tx = ktime_add_ns(spin_until, pkt_dev->delay);
}

static inline void set_pkt_overhead(struct pktgen_dev *pkt_dev)
{
    pkt_dev->pkt_overhead = 0;
    pkt_dev->pkt_overhead += pkt_dev->nr_labels*sizeof(u32);
    pkt_dev->pkt_overhead += VLAN_TAG_SIZE(pkt_dev);
    pkt_dev->pkt_overhead += SVLAN_TAG_SIZE(pkt_dev);
}

static inline int f_seen(const struct pktgen_dev *pkt_dev, int flow)
{
    return !!(pkt_dev->flows[flow].flags & F_INIT);
}

static inline int f_pick(struct pktgen_dev *pkt_dev)
{
    int flow = pkt_dev->curfl;

    if (pkt_dev->flags & F_FLOW_SEQ) {
        if (pkt_dev->flows[flow].count >= pkt_dev->lflow) {
            /* reset time */
            pkt_dev->flows[flow].count = 0;
            pkt_dev->flows[flow].flags = 0;
            pkt_dev->curfl += 1;
            if (pkt_dev->curfl >= pkt_dev->cflows)
                pkt_dev->curfl = 0; /*reset */
        }
    } else {
        flow = random32() % pkt_dev->cflows;
        pkt_dev->curfl = flow;

        if (pkt_dev->flows[flow].count > pkt_dev->lflow) {
            pkt_dev->flows[flow].count = 0;
            pkt_dev->flows[flow].flags = 0;
        }
    }

    return pkt_dev->curfl;
}


#ifdef CONFIG_XFRM
/* If there was already an IPSEC SA, we keep it as is, else
 * we go look for it ...
*/
#define DUMMY_MARK 0
static void get_ipsec_sa(struct pktgen_dev *pkt_dev, int flow)
{
    struct xfrm_state *x = pkt_dev->flows[flow].x;
    if (!x) {
        /*slow path: we dont already have xfrm_state*/
        x = xfrm_stateonly_find(&init_net, DUMMY_MARK,
                    (xfrm_address_t *)&pkt_dev->cur_daddr,
                    (xfrm_address_t *)&pkt_dev->cur_saddr,
                    AF_INET,
                    pkt_dev->ipsmode,
                    pkt_dev->ipsproto, 0);
        if (x) {
            pkt_dev->flows[flow].x = x;
            set_pkt_overhead(pkt_dev);
            pkt_dev->pkt_overhead += x->props.header_len;
        }

    }
}
#endif
static void set_cur_queue_map(struct pktgen_dev *pkt_dev)
{

    if (pkt_dev->flags & F_QUEUE_MAP_CPU)
        pkt_dev->cur_queue_map = smp_processor_id();

    else if (pkt_dev->queue_map_min <= pkt_dev->queue_map_max) {
        __u16 t;
        if (pkt_dev->flags & F_QUEUE_MAP_RND) {
            t = random32() %
                (pkt_dev->queue_map_max -
                 pkt_dev->queue_map_min + 1)
                + pkt_dev->queue_map_min;
        } else {
            t = pkt_dev->cur_queue_map + 1;
            if (t > pkt_dev->queue_map_max)
                t = pkt_dev->queue_map_min;
        }
        pkt_dev->cur_queue_map = t;
    }
    pkt_dev->cur_queue_map  = pkt_dev->cur_queue_map % pkt_dev->odev->real_num_tx_queues;
}

/* Increment/randomize headers according to flags and current values
 * for IP src/dest, UDP src/dst port, MAC-Addr src/dst
 */
static void mod_cur_headers(struct pktgen_dev *pkt_dev)
{
    __u32 imn;
    __u32 imx;
    int flow = 0;

    if (pkt_dev->cflows)
        flow = f_pick(pkt_dev);

    /*  Deal with source MAC */
    if (pkt_dev->src_mac_count > 1) {
        __u32 mc;
        __u32 tmp;

        if (pkt_dev->flags & F_MACSRC_RND)
            mc = random32() % pkt_dev->src_mac_count;
        else {
            mc = pkt_dev->cur_src_mac_offset++;
            if (pkt_dev->cur_src_mac_offset >=
                pkt_dev->src_mac_count)
                pkt_dev->cur_src_mac_offset = 0;
        }

        tmp = pkt_dev->src_mac[5] + (mc & 0xFF);
        pkt_dev->hh[11] = tmp;
        tmp = (pkt_dev->src_mac[4] + ((mc >> 8) & 0xFF) + (tmp >> 8));
        pkt_dev->hh[10] = tmp;
        tmp = (pkt_dev->src_mac[3] + ((mc >> 16) & 0xFF) + (tmp >> 8));
        pkt_dev->hh[9] = tmp;
        tmp = (pkt_dev->src_mac[2] + ((mc >> 24) & 0xFF) + (tmp >> 8));
        pkt_dev->hh[8] = tmp;
        tmp = (pkt_dev->src_mac[1] + (tmp >> 8));
        pkt_dev->hh[7] = tmp;
    }

    /*  Deal with Destination MAC */
    if (pkt_dev->dst_mac_count > 1) {
        __u32 mc;
        __u32 tmp;

        if (pkt_dev->flags & F_MACDST_RND)
            mc = random32() % pkt_dev->dst_mac_count;

        else {
            mc = pkt_dev->cur_dst_mac_offset++;
            if (pkt_dev->cur_dst_mac_offset >=
                pkt_dev->dst_mac_count) {
                pkt_dev->cur_dst_mac_offset = 0;
            }
        }

        tmp = pkt_dev->dst_mac[5] + (mc & 0xFF);
        pkt_dev->hh[5] = tmp;
        tmp = (pkt_dev->dst_mac[4] + ((mc >> 8) & 0xFF) + (tmp >> 8));
        pkt_dev->hh[4] = tmp;
        tmp = (pkt_dev->dst_mac[3] + ((mc >> 16) & 0xFF) + (tmp >> 8));
        pkt_dev->hh[3] = tmp;
        tmp = (pkt_dev->dst_mac[2] + ((mc >> 24) & 0xFF) + (tmp >> 8));
        pkt_dev->hh[2] = tmp;
        tmp = (pkt_dev->dst_mac[1] + (tmp >> 8));
        pkt_dev->hh[1] = tmp;
    }

    if (pkt_dev->flags & F_MPLS_RND) {
        unsigned int i;
        for (i = 0; i < pkt_dev->nr_labels; i++)
            if (pkt_dev->labels[i] & MPLS_STACK_BOTTOM)
                pkt_dev->labels[i] = MPLS_STACK_BOTTOM |
                         ((__force __be32)random32() &
                              htonl(0x000fffff));
    }

    if ((pkt_dev->flags & F_VID_RND) && (pkt_dev->vlan_id != 0xffff)) {
        pkt_dev->vlan_id = random32() & (4096-1);
    }

    if ((pkt_dev->flags & F_SVID_RND) && (pkt_dev->svlan_id != 0xffff)) {
        pkt_dev->svlan_id = random32() & (4096 - 1);
    }

    if (pkt_dev->udp_src_min < pkt_dev->udp_src_max) {
        if (pkt_dev->flags & F_UDPSRC_RND)
            pkt_dev->cur_udp_src = random32() %
                (pkt_dev->udp_src_max - pkt_dev->udp_src_min)
                + pkt_dev->udp_src_min;

        else {
            pkt_dev->cur_udp_src++;
            if (pkt_dev->cur_udp_src >= pkt_dev->udp_src_max)
                pkt_dev->cur_udp_src = pkt_dev->udp_src_min;
        }
    }

    if (pkt_dev->udp_dst_min < pkt_dev->udp_dst_max) {
        if (pkt_dev->flags & F_UDPDST_RND) {
            pkt_dev->cur_udp_dst = random32() %
                (pkt_dev->udp_dst_max - pkt_dev->udp_dst_min)
                + pkt_dev->udp_dst_min;
        } else {
            pkt_dev->cur_udp_dst++;
            if (pkt_dev->cur_udp_dst >= pkt_dev->udp_dst_max)
                pkt_dev->cur_udp_dst = pkt_dev->udp_dst_min;
        }
    }

    if (!(pkt_dev->flags & F_IPV6)) {

        imn = ntohl(pkt_dev->saddr_min);
        imx = ntohl(pkt_dev->saddr_max);
        if (imn < imx) {
            __u32 t;
            if (pkt_dev->flags & F_IPSRC_RND)
                t = random32() % (imx - imn) + imn;
            else {
                t = ntohl(pkt_dev->cur_saddr);
                t++;
                if (t > imx)
                    t = imn;

            }
            pkt_dev->cur_saddr = htonl(t);
        }

        if (pkt_dev->cflows && f_seen(pkt_dev, flow)) {
            pkt_dev->cur_daddr = pkt_dev->flows[flow].cur_daddr;
        } else {
            imn = ntohl(pkt_dev->daddr_min);
            imx = ntohl(pkt_dev->daddr_max);
            if (imn < imx) {
                __u32 t;
                __be32 s;
                if (pkt_dev->flags & F_IPDST_RND) {

                    t = random32() % (imx - imn) + imn;
                    s = htonl(t);

                    while (ipv4_is_loopback(s) ||
                           ipv4_is_multicast(s) ||
                           ipv4_is_lbcast(s) ||
                           ipv4_is_zeronet(s) ||
                           ipv4_is_local_multicast(s)) {
                        t = random32() % (imx - imn) + imn;
                        s = htonl(t);
                    }
                    pkt_dev->cur_daddr = s;
                } else {
                    t = ntohl(pkt_dev->cur_daddr);
                    t++;
                    if (t > imx) {
                        t = imn;
                    }
                    pkt_dev->cur_daddr = htonl(t);
                }
            }
            if (pkt_dev->cflows) {
                pkt_dev->flows[flow].flags |= F_INIT;
                pkt_dev->flows[flow].cur_daddr =
                    pkt_dev->cur_daddr;
#ifdef CONFIG_XFRM
                if (pkt_dev->flags & F_IPSEC_ON)
                    get_ipsec_sa(pkt_dev, flow);
#endif
                pkt_dev->nflows++;
            }
        }
    } else {        /* IPV6 * */

        if (pkt_dev->min_in6_daddr.s6_addr32[0] == 0 &&
            pkt_dev->min_in6_daddr.s6_addr32[1] == 0 &&
            pkt_dev->min_in6_daddr.s6_addr32[2] == 0 &&
            pkt_dev->min_in6_daddr.s6_addr32[3] == 0) ;
        else {
            int i;

            /* Only random destinations yet */

            for (i = 0; i < 4; i++) {
                pkt_dev->cur_in6_daddr.s6_addr32[i] =
                    (((__force __be32)random32() |
                      pkt_dev->min_in6_daddr.s6_addr32[i]) &
                     pkt_dev->max_in6_daddr.s6_addr32[i]);
            }
        }
    }

    if (pkt_dev->min_pkt_size < pkt_dev->max_pkt_size) {
        __u32 t;
        if (pkt_dev->flags & F_TXSIZE_RND) {
            t = random32() %
                (pkt_dev->max_pkt_size - pkt_dev->min_pkt_size)
                + pkt_dev->min_pkt_size;
        } else {
            t = pkt_dev->cur_pkt_size + 1;
            if (t > pkt_dev->max_pkt_size)
                t = pkt_dev->min_pkt_size;
        }
        pkt_dev->cur_pkt_size = t;
    }

    set_cur_queue_map(pkt_dev);

    pkt_dev->flows[flow].count++;
}


#ifdef CONFIG_XFRM
static int pktgen_output_ipsec(struct sk_buff *skb, struct pktgen_dev *pkt_dev)
{
    struct xfrm_state *x = pkt_dev->flows[pkt_dev->curfl].x;
    int err = 0;

    if (!x)
        return 0;
    /* XXX: we dont support tunnel mode for now until
     * we resolve the dst issue */
    if (x->props.mode != XFRM_MODE_TRANSPORT)
        return 0;

    spin_lock(&x->lock);

    err = x->outer_mode->output(x, skb);
    if (err)
        goto error;
    err = x->type->output(x, skb);
    if (err)
        goto error;

    x->curlft.bytes += skb->len;
    x->curlft.packets++;
error:
    spin_unlock(&x->lock);
    return err;
}

static void free_SAs(struct pktgen_dev *pkt_dev)
{
    if (pkt_dev->cflows) {
        /* let go of the SAs if we have them */
        int i;
        for (i = 0; i < pkt_dev->cflows; i++) {
            struct xfrm_state *x = pkt_dev->flows[i].x;
            if (x) {
                xfrm_state_put(x);
                pkt_dev->flows[i].x = NULL;
            }
        }
    }
}

static int process_ipsec(struct pktgen_dev *pkt_dev,
                  struct sk_buff *skb, __be16 protocol)
{
    if (pkt_dev->flags & F_IPSEC_ON) {
        struct xfrm_state *x = pkt_dev->flows[pkt_dev->curfl].x;
        int nhead = 0;
        if (x) {
            int ret;
            __u8 *eth;
            nhead = x->props.header_len - skb_headroom(skb);
            if (nhead > 0) {
                ret = pskb_expand_head(skb, nhead, 0, GFP_ATOMIC);
                if (ret < 0) {
                    pr_err("Error expanding ipsec packet %d\n",
                           ret);
                    goto err;
                }
            }

            /* ipsec is not expecting ll header */
            skb_pull(skb, ETH_HLEN);
            ret = pktgen_output_ipsec(skb, pkt_dev);
            if (ret) {
                pr_err("Error creating ipsec packet %d\n", ret);
                goto err;
            }
            /* restore ll */
            eth = (__u8 *) skb_push(skb, ETH_HLEN);
            memcpy(eth, pkt_dev->hh, 12);
            *(u16 *) &eth[12] = protocol;
        }
    }
    return 1;
err:
    kfree_skb(skb);
    return 0;
}
#endif

static void mpls_push(__be32 *mpls, struct pktgen_dev *pkt_dev)
{
    unsigned int i;
    for (i = 0; i < pkt_dev->nr_labels; i++)
        *mpls++ = pkt_dev->labels[i] & ~MPLS_STACK_BOTTOM;

    mpls--;
    *mpls |= MPLS_STACK_BOTTOM;
}

static inline __be16 build_tci(unsigned int id, unsigned int cfi,
                   unsigned int prio)
{
    return htons(id | (cfi << 12) | (prio << 13));
}

static void pktgen_finalize_skb(struct pktgen_dev *pkt_dev, struct sk_buff *skb,
                int datalen)
{
    struct timeval timestamp;
    struct pktgen_hdr *pgh;

    pgh = (struct pktgen_hdr *)skb_put(skb, sizeof(*pgh));
    datalen -= sizeof(*pgh);

    if (pkt_dev->nfrags <= 0) {
        memset(skb_put(skb, datalen), 0, datalen);
    } else {
        int frags = pkt_dev->nfrags;
        int i, len;
        int frag_len;


        if (frags > MAX_SKB_FRAGS)
            frags = MAX_SKB_FRAGS;
        len = datalen - frags * PAGE_SIZE;
        if (len > 0) {
            memset(skb_put(skb, len), 0, len);
            datalen = frags * PAGE_SIZE;
        }

        i = 0;
        frag_len = (datalen/frags) < PAGE_SIZE ?
               (datalen/frags) : PAGE_SIZE;
        while (datalen > 0) {
            if (unlikely(!pkt_dev->page)) {
                int node = numa_node_id();

                if (pkt_dev->node >= 0 && (pkt_dev->flags & F_NODE))
                    node = pkt_dev->node;
                pkt_dev->page = alloc_pages_node(node, GFP_KERNEL | __GFP_ZERO, 0);
                if (!pkt_dev->page)
                    break;
            }
            get_page(pkt_dev->page);
            skb_frag_set_page(skb, i, pkt_dev->page);
            skb_shinfo(skb)->frags[i].page_offset = 0;
            /*last fragment, fill rest of data*/
            if (i == (frags - 1))
                skb_frag_size_set(&skb_shinfo(skb)->frags[i],
                    (datalen < PAGE_SIZE ? datalen : PAGE_SIZE));
            else
                skb_frag_size_set(&skb_shinfo(skb)->frags[i], frag_len);
            datalen -= skb_frag_size(&skb_shinfo(skb)->frags[i]);
            skb->len += skb_frag_size(&skb_shinfo(skb)->frags[i]);
            skb->data_len += skb_frag_size(&skb_shinfo(skb)->frags[i]);
            i++;
            skb_shinfo(skb)->nr_frags = i;
        }
    }

    /* Stamp the time, and sequence number,
     * convert them to network byte order
     */
    pgh->pgh_magic = htonl(PKTGEN_MAGIC);
    pgh->seq_num = htonl(pkt_dev->seq_num);

    do_gettimeofday(&timestamp);
    pgh->tv_sec = htonl(timestamp.tv_sec);
    pgh->tv_usec = htonl(timestamp.tv_usec);
}

static struct sk_buff *fill_packet_ipv4(struct net_device *odev,
                    struct pktgen_dev *pkt_dev)
{
    struct sk_buff *skb = NULL;
    __u8 *eth;
    struct udphdr *udph;
    int datalen, iplen;
    struct iphdr *iph;
    __be16 protocol = htons(ETH_P_IP);
    __be32 *mpls;
    __be16 *vlan_tci = NULL;                 /* Encapsulates priority and VLAN ID */
    __be16 *vlan_encapsulated_proto = NULL;  /* packet type ID field (or len) for VLAN tag */
    __be16 *svlan_tci = NULL;                /* Encapsulates priority and SVLAN ID */
    __be16 *svlan_encapsulated_proto = NULL; /* packet type ID field (or len) for SVLAN tag */
    u16 queue_map;

    if (pkt_dev->nr_labels)
        protocol = htons(ETH_P_MPLS_UC);

    if (pkt_dev->vlan_id != 0xffff)
        protocol = htons(ETH_P_8021Q);

    /* Update any of the values, used when we're incrementing various
     * fields.
     */
    mod_cur_headers(pkt_dev);
    queue_map = pkt_dev->cur_queue_map;

    datalen = (odev->hard_header_len + 16) & ~0xf;

    if (pkt_dev->flags & F_NODE) {
        int node;

        if (pkt_dev->node >= 0)
            node = pkt_dev->node;
        else
            node =  numa_node_id();

        skb = __alloc_skb(NET_SKB_PAD + pkt_dev->cur_pkt_size + 64
                  + datalen + pkt_dev->pkt_overhead, GFP_NOWAIT, 0, node);
        if (likely(skb)) {
            skb_reserve(skb, NET_SKB_PAD);
            skb->dev = odev;
        }
    }
    else
      skb = __netdev_alloc_skb(odev,
                   pkt_dev->cur_pkt_size + 64
                   + datalen + pkt_dev->pkt_overhead, GFP_NOWAIT);

    if (!skb) {
        sprintf(pkt_dev->result, "No memory");
        return NULL;
    }
    prefetchw(skb->data);

    skb_reserve(skb, datalen);

    /*  Reserve for ethernet and IP header  */
    eth = (__u8 *) skb_push(skb, 14);
    mpls = (__be32 *)skb_put(skb, pkt_dev->nr_labels*sizeof(__u32));
    if (pkt_dev->nr_labels)
        mpls_push(mpls, pkt_dev);

    if (pkt_dev->vlan_id != 0xffff) {
        if (pkt_dev->svlan_id != 0xffff) {
            svlan_tci = (__be16 *)skb_put(skb, sizeof(__be16));
            *svlan_tci = build_tci(pkt_dev->svlan_id,
                           pkt_dev->svlan_cfi,
                           pkt_dev->svlan_p);
            svlan_encapsulated_proto = (__be16 *)skb_put(skb, sizeof(__be16));
            *svlan_encapsulated_proto = htons(ETH_P_8021Q);
        }
        vlan_tci = (__be16 *)skb_put(skb, sizeof(__be16));
        *vlan_tci = build_tci(pkt_dev->vlan_id,
                      pkt_dev->vlan_cfi,
                      pkt_dev->vlan_p);
        vlan_encapsulated_proto = (__be16 *)skb_put(skb, sizeof(__be16));
        *vlan_encapsulated_proto = htons(ETH_P_IP);
    }

    skb->network_header = skb->tail;
    skb->transport_header = skb->network_header + sizeof(struct iphdr);
    skb_put(skb, sizeof(struct iphdr) + sizeof(struct udphdr));
    skb_set_queue_mapping(skb, queue_map);
    skb->priority = pkt_dev->skb_priority;

    iph = ip_hdr(skb);
    udph = udp_hdr(skb);

    memcpy(eth, pkt_dev->hh, 12);
    *(__be16 *) & eth[12] = protocol;

    /* Eth + IPh + UDPh + mpls */
    datalen = pkt_dev->cur_pkt_size - 14 - 20 - 8 -
          pkt_dev->pkt_overhead;
    if (datalen < 0 || datalen < sizeof(struct pktgen_hdr))
        datalen = sizeof(struct pktgen_hdr);

    udph->source = htons(pkt_dev->cur_udp_src);
    udph->dest = htons(pkt_dev->cur_udp_dst);
    udph->len = htons(datalen + 8); /* DATA + udphdr */
    udph->check = 0;    /* No checksum */

    iph->ihl = 5;
    iph->version = 4;
    iph->ttl = 32;
    iph->tos = pkt_dev->tos;
    iph->protocol = IPPROTO_UDP;    /* UDP */
    iph->saddr = pkt_dev->cur_saddr;
    iph->daddr = pkt_dev->cur_daddr;
    iph->id = htons(pkt_dev->ip_id);
    pkt_dev->ip_id++;
    iph->frag_off = 0;
    iplen = 20 + 8 + datalen;
    iph->tot_len = htons(iplen);
    iph->check = 0;
    iph->check = ip_fast_csum((void *)iph, iph->ihl);
    skb->protocol = protocol;
    skb->mac_header = (skb->network_header - ETH_HLEN -
               pkt_dev->pkt_overhead);
    skb->dev = odev;
    skb->pkt_type = PACKET_HOST;
    pktgen_finalize_skb(pkt_dev, skb, datalen);

#ifdef CONFIG_XFRM
    if (!process_ipsec(pkt_dev, skb, protocol))
        return NULL;
#endif

    return skb;
}

static struct sk_buff *fill_packet_ipv6(struct net_device *odev,
                    struct pktgen_dev *pkt_dev)
{
    struct sk_buff *skb = NULL;
    __u8 *eth;
    struct udphdr *udph;
    int datalen;
    struct ipv6hdr *iph;
    __be16 protocol = htons(ETH_P_IPV6);
    __be32 *mpls;
    __be16 *vlan_tci = NULL;                 /* Encapsulates priority and VLAN ID */
    __be16 *vlan_encapsulated_proto = NULL;  /* packet type ID field (or len) for VLAN tag */
    __be16 *svlan_tci = NULL;                /* Encapsulates priority and SVLAN ID */
    __be16 *svlan_encapsulated_proto = NULL; /* packet type ID field (or len) for SVLAN tag */
    u16 queue_map;

    if (pkt_dev->nr_labels)
        protocol = htons(ETH_P_MPLS_UC);

    if (pkt_dev->vlan_id != 0xffff)
        protocol = htons(ETH_P_8021Q);

    /* Update any of the values, used when we're incrementing various
     * fields.
     */
    mod_cur_headers(pkt_dev);
    queue_map = pkt_dev->cur_queue_map;

    skb = __netdev_alloc_skb(odev,
                 pkt_dev->cur_pkt_size + 64
                 + 16 + pkt_dev->pkt_overhead, GFP_NOWAIT);
    if (!skb) {
        sprintf(pkt_dev->result, "No memory");
        return NULL;
    }
    prefetchw(skb->data);

    skb_reserve(skb, 16);

    /*  Reserve for ethernet and IP header  */
    eth = (__u8 *) skb_push(skb, 14);
    mpls = (__be32 *)skb_put(skb, pkt_dev->nr_labels*sizeof(__u32));
    if (pkt_dev->nr_labels)
        mpls_push(mpls, pkt_dev);

    if (pkt_dev->vlan_id != 0xffff) {
        if (pkt_dev->svlan_id != 0xffff) {
            svlan_tci = (__be16 *)skb_put(skb, sizeof(__be16));
            *svlan_tci = build_tci(pkt_dev->svlan_id,
                           pkt_dev->svlan_cfi,
                           pkt_dev->svlan_p);
            svlan_encapsulated_proto = (__be16 *)skb_put(skb, sizeof(__be16));
            *svlan_encapsulated_proto = htons(ETH_P_8021Q);
        }
        vlan_tci = (__be16 *)skb_put(skb, sizeof(__be16));
        *vlan_tci = build_tci(pkt_dev->vlan_id,
                      pkt_dev->vlan_cfi,
                      pkt_dev->vlan_p);
        vlan_encapsulated_proto = (__be16 *)skb_put(skb, sizeof(__be16));
        *vlan_encapsulated_proto = htons(ETH_P_IPV6);
    }

    skb->network_header = skb->tail;
    skb->transport_header = skb->network_header + sizeof(struct ipv6hdr);
    skb_put(skb, sizeof(struct ipv6hdr) + sizeof(struct udphdr));
    skb_set_queue_mapping(skb, queue_map);
    skb->priority = pkt_dev->skb_priority;
    iph = ipv6_hdr(skb);
    udph = udp_hdr(skb);

    memcpy(eth, pkt_dev->hh, 12);
    *(__be16 *) &eth[12] = protocol;

    /* Eth + IPh + UDPh + mpls */
    datalen = pkt_dev->cur_pkt_size - 14 -
          sizeof(struct ipv6hdr) - sizeof(struct udphdr) -
          pkt_dev->pkt_overhead;

    if (datalen < 0 || datalen < sizeof(struct pktgen_hdr)) {
        datalen = sizeof(struct pktgen_hdr);
        net_info_ratelimited("increased datalen to %d\n", datalen);
    }

    udph->source = htons(pkt_dev->cur_udp_src);
    udph->dest = htons(pkt_dev->cur_udp_dst);
    udph->len = htons(datalen + sizeof(struct udphdr));
    udph->check = 0;    /* No checksum */

    *(__be32 *) iph = htonl(0x60000000);    /* Version + flow */

    if (pkt_dev->traffic_class) {
        /* Version + traffic class + flow (0) */
        *(__be32 *)iph |= htonl(0x60000000 | (pkt_dev->traffic_class << 20));
    }

    iph->hop_limit = 32;

    iph->payload_len = htons(sizeof(struct udphdr) + datalen);
    iph->nexthdr = IPPROTO_UDP;

    iph->daddr = pkt_dev->cur_in6_daddr;
    iph->saddr = pkt_dev->cur_in6_saddr;

    skb->mac_header = (skb->network_header - ETH_HLEN -
               pkt_dev->pkt_overhead);
    skb->protocol = protocol;
    skb->dev = odev;
    skb->pkt_type = PACKET_HOST;

    pktgen_finalize_skb(pkt_dev, skb, datalen);

    return skb;
}

static struct sk_buff *fill_packet(struct net_device *odev,
                   struct pktgen_dev *pkt_dev)
{
    if (pkt_dev->flags & F_IPV6)
        return fill_packet_ipv6(odev, pkt_dev);
    else
        return fill_packet_ipv4(odev, pkt_dev);
}

static void pktgen_clear_counters(struct pktgen_dev *pkt_dev)
{
    pkt_dev->seq_num = 1;
    pkt_dev->idle_acc = 0;
    pkt_dev->sofar = 0;
    pkt_dev->tx_bytes = 0;
    pkt_dev->errors = 0;
}

/* Set up structure for sending pkts, clear counters */

static void pktgen_run(struct pktgen_thread *t)
{
    struct pktgen_dev *pkt_dev;
    int started = 0;

    func_enter();

    if_lock(t);
    list_for_each_entry(pkt_dev, &t->if_list, list) {

        /*
         * setup odev and create initial packet.
         */
        pktgen_setup_inject(pkt_dev);

        if (pkt_dev->odev) {
            pktgen_clear_counters(pkt_dev);
            pkt_dev->running = 1;   /* Cranke yeself! */
            pkt_dev->skb = NULL;
            pkt_dev->started_at =
                pkt_dev->next_tx = ktime_now();

            set_pkt_overhead(pkt_dev);

            strcpy(pkt_dev->result, "Starting");
            started++;
        } else
            strcpy(pkt_dev->result, "Error starting");
    }
    if_unlock(t);
    if (started)
        t->control &= ~(T_STOP);
}

static void pktgen_stop_all_threads_ifs(void)
{
    struct pktgen_thread *t;

    func_enter();

    mutex_lock(&pktgen_thread_lock);

    list_for_each_entry(t, &pktgen_threads, th_list)
        t->control |= T_STOP;

    mutex_unlock(&pktgen_thread_lock);
}

static int thread_is_running(const struct pktgen_thread *t)
{
    const struct pktgen_dev *pkt_dev;

    list_for_each_entry(pkt_dev, &t->if_list, list)
        if (pkt_dev->running)
            return 1;
    return 0;
}

static int pktgen_wait_thread_run(struct pktgen_thread *t)
{
    if_lock(t);

    while (thread_is_running(t)) {

        if_unlock(t);

        msleep_interruptible(100);

        if (signal_pending(current))
            goto signal;
        if_lock(t);
    }
    if_unlock(t);
    return 1;
signal:
    return 0;
}

static int pktgen_wait_all_threads_run(void)
{
    struct pktgen_thread *t;
    int sig = 1;

    mutex_lock(&pktgen_thread_lock);

    list_for_each_entry(t, &pktgen_threads, th_list) {
        sig = pktgen_wait_thread_run(t);
        if (sig == 0)
            break;
    }

    if (sig == 0)
        list_for_each_entry(t, &pktgen_threads, th_list)
            t->control |= (T_STOP);

    mutex_unlock(&pktgen_thread_lock);
    return sig;
}

static void pktgen_run_all_threads(void)
{
    struct pktgen_thread *t;

    func_enter();

    mutex_lock(&pktgen_thread_lock);

    list_for_each_entry(t, &pktgen_threads, th_list)
        t->control |= (T_RUN);

    mutex_unlock(&pktgen_thread_lock);

    /* Propagate thread->control  */
    schedule_timeout_interruptible(msecs_to_jiffies(125));

    pktgen_wait_all_threads_run();
}

static void pktgen_reset_all_threads(void)
{
    struct pktgen_thread *t;

    func_enter();

    mutex_lock(&pktgen_thread_lock);

    list_for_each_entry(t, &pktgen_threads, th_list)
        t->control |= (T_REMDEVALL);

    mutex_unlock(&pktgen_thread_lock);

    /* Propagate thread->control  */
    schedule_timeout_interruptible(msecs_to_jiffies(125));

    pktgen_wait_all_threads_run();
}

static void show_results(struct pktgen_dev *pkt_dev, int nr_frags)
{
    __u64 bps, mbps, pps;
    char *p = pkt_dev->result;
    ktime_t elapsed = ktime_sub(pkt_dev->stopped_at,
                    pkt_dev->started_at);
    ktime_t idle = ns_to_ktime(pkt_dev->idle_acc);

    p += sprintf(p, "OK: %llu(c%llu+d%llu) usec, %llu (%dbyte,%dfrags)\n",
             (unsigned long long)ktime_to_us(elapsed),
             (unsigned long long)ktime_to_us(ktime_sub(elapsed, idle)),
             (unsigned long long)ktime_to_us(idle),
             (unsigned long long)pkt_dev->sofar,
             pkt_dev->cur_pkt_size, nr_frags);

    pps = div64_u64(pkt_dev->sofar * NSEC_PER_SEC,
            ktime_to_ns(elapsed));

    bps = pps * 8 * pkt_dev->cur_pkt_size;

    mbps = bps;
    do_div(mbps, 1000000);
    p += sprintf(p, "  %llupps %lluMb/sec (%llubps) errors: %llu",
             (unsigned long long)pps,
             (unsigned long long)mbps,
             (unsigned long long)bps,
             (unsigned long long)pkt_dev->errors);
}

/* Set stopped-at timer, remove from running list, do counters & statistics */
static int pktgen_stop_device(struct pktgen_dev *pkt_dev)
{
    int nr_frags = pkt_dev->skb ? skb_shinfo(pkt_dev->skb)->nr_frags : -1;

    if (!pkt_dev->running) {
        pr_warning("interface: %s is already stopped\n",
               pkt_dev->odevname);
        return -EINVAL;
    }

    kfree_skb(pkt_dev->skb);
    pkt_dev->skb = NULL;
    pkt_dev->stopped_at = ktime_now();
    pkt_dev->running = 0;

    show_results(pkt_dev, nr_frags);

    return 0;
}

static struct pktgen_dev *next_to_run(struct pktgen_thread *t)
{
    struct pktgen_dev *pkt_dev, *best = NULL;

    if_lock(t);

    list_for_each_entry(pkt_dev, &t->if_list, list) {
        if (!pkt_dev->running)
            continue;
        if (best == NULL)
            best = pkt_dev;
        else if (ktime_lt(pkt_dev->next_tx, best->next_tx))
            best = pkt_dev;
    }
    if_unlock(t);
    return best;
}

static void pktgen_stop(struct pktgen_thread *t)
{
    struct pktgen_dev *pkt_dev;

    func_enter();

    if_lock(t);

    list_for_each_entry(pkt_dev, &t->if_list, list) {
        pktgen_stop_device(pkt_dev);
    }

    if_unlock(t);
}

/*
 * one of our devices needs to be removed - find it
 * and remove it
 */
static void pktgen_rem_one_if(struct pktgen_thread *t)
{
    struct list_head *q, *n;
    struct pktgen_dev *cur;

    func_enter();

    if_lock(t);

    list_for_each_safe(q, n, &t->if_list) {
        cur = list_entry(q, struct pktgen_dev, list);

        if (!cur->removal_mark)
            continue;

        kfree_skb(cur->skb);
        cur->skb = NULL;

        pktgen_remove_device(t, cur);

        break;
    }

    if_unlock(t);
}

static void pktgen_rem_all_ifs(struct pktgen_thread *t)
{
    struct list_head *q, *n;
    struct pktgen_dev *cur;

    func_enter();

    /* Remove all devices, free mem */

    if_lock(t);

    list_for_each_safe(q, n, &t->if_list) {
        cur = list_entry(q, struct pktgen_dev, list);

        kfree_skb(cur->skb);
        cur->skb = NULL;

        pktgen_remove_device(t, cur);
    }

    if_unlock(t);
}

static void pktgen_rem_thread(struct pktgen_thread *t)
{
    /* Remove from the thread list */

    remove_proc_entry(t->tsk->comm, pg_proc_dir);

}

static void pktgen_resched(struct pktgen_dev *pkt_dev)
{
    ktime_t idle_start = ktime_now();
    schedule();
    pkt_dev->idle_acc += ktime_to_ns(ktime_sub(ktime_now(), idle_start));
}

static void pktgen_wait_for_skb(struct pktgen_dev *pkt_dev)
{
    ktime_t idle_start = ktime_now();

    while (atomic_read(&(pkt_dev->skb->users)) != 1) {
        if (signal_pending(current))
            break;

        if (need_resched())
            pktgen_resched(pkt_dev);
        else
            cpu_relax();
    }
    pkt_dev->idle_acc += ktime_to_ns(ktime_sub(ktime_now(), idle_start));
}

static void pktgen_xmit(struct pktgen_dev *pkt_dev)
{
    struct net_device *odev = pkt_dev->odev;
    netdev_tx_t (*xmit)(struct sk_buff *, struct net_device *)
        = odev->netdev_ops->ndo_start_xmit;
    struct netdev_queue *txq;
    u16 queue_map;
    int ret;

    /* If device is offline, then don't send */
    if (unlikely(!netif_running(odev) || !netif_carrier_ok(odev))) {
        pktgen_stop_device(pkt_dev);
        return;
    }

    /* This is max DELAY, this has special meaning of
     * "never transmit"
     */
    if (unlikely(pkt_dev->delay == ULLONG_MAX)) {
        pkt_dev->next_tx = ktime_add_ns(ktime_now(), ULONG_MAX);
        return;
    }

    /* If no skb or clone count exhausted then get new one */
    if (!pkt_dev->skb || (pkt_dev->last_ok &&
                  ++pkt_dev->clone_count >= pkt_dev->clone_skb)) {
        /* build a new pkt */
        kfree_skb(pkt_dev->skb);

        pkt_dev->skb = fill_packet(odev, pkt_dev);
        if (pkt_dev->skb == NULL) {
            pr_err("ERROR: couldn't allocate skb in fill_packet\n");
            schedule();
            pkt_dev->clone_count--; /* back out increment, OOM */
            return;
        }
        pkt_dev->last_pkt_size = pkt_dev->skb->len;
        pkt_dev->allocated_skbs++;
        pkt_dev->clone_count = 0;   /* reset counter */
    }

    if (pkt_dev->delay && pkt_dev->last_ok)
        spin(pkt_dev, pkt_dev->next_tx);

    queue_map = skb_get_queue_mapping(pkt_dev->skb);
    txq = netdev_get_tx_queue(odev, queue_map);

    __netif_tx_lock_bh(txq);

    if (unlikely(netif_xmit_frozen_or_stopped(txq))) {
        ret = NETDEV_TX_BUSY;
        pkt_dev->last_ok = 0;
        goto unlock;
    }
    atomic_inc(&(pkt_dev->skb->users));
    ret = (*xmit)(pkt_dev->skb, odev);

    switch (ret) {
    case NETDEV_TX_OK:
        txq_trans_update(txq);
        pkt_dev->last_ok = 1;
        pkt_dev->sofar++;
        pkt_dev->seq_num++;
        pkt_dev->tx_bytes += pkt_dev->last_pkt_size;
        break;
    case NET_XMIT_DROP:
    case NET_XMIT_CN:
    case NET_XMIT_POLICED:
        /* skb has been consumed */
        pkt_dev->errors++;
        break;
    default: /* Drivers are not supposed to return other values! */
        net_info_ratelimited("%s xmit error: %d\n",
                     pkt_dev->odevname, ret);
        pkt_dev->errors++;
        /* fallthru */
    case NETDEV_TX_LOCKED:
    case NETDEV_TX_BUSY:
        /* Retry it next time */
        atomic_dec(&(pkt_dev->skb->users));
        pkt_dev->last_ok = 0;
    }
unlock:
    __netif_tx_unlock_bh(txq);

    /* If pkt_dev->count is zero, then run forever */
    if ((pkt_dev->count != 0) && (pkt_dev->sofar >= pkt_dev->count)) {
        pktgen_wait_for_skb(pkt_dev);

        /* Done with this */
        pktgen_stop_device(pkt_dev);
    }
}

/*
 * Main loop of the thread goes here
 */

static int pktgen_thread_worker(void *arg)
{
    DEFINE_WAIT(wait);
    struct pktgen_thread *t = arg;
    struct pktgen_dev *pkt_dev = NULL;
    int cpu = t->cpu;

    BUG_ON(smp_processor_id() != cpu);

    init_waitqueue_head(&t->queue);
    complete(&t->start_done);

    pr_debug("starting pktgen/%d:  pid=%d\n", cpu, task_pid_nr(current));

    set_current_state(TASK_INTERRUPTIBLE);

    set_freezable();

    while (!kthread_should_stop()) {
        pkt_dev = next_to_run(t);

        if (unlikely(!pkt_dev && t->control == 0)) {
            if (pktgen_exiting)
                break;
            wait_event_interruptible_timeout(t->queue,
                             t->control != 0,
                             HZ/10);
            try_to_freeze();
            continue;
        }

        __set_current_state(TASK_RUNNING);

        if (likely(pkt_dev)) {
            pktgen_xmit(pkt_dev);

            if (need_resched())
                pktgen_resched(pkt_dev);
            else
                cpu_relax();
        }

        if (t->control & T_STOP) {
            pktgen_stop(t);
            t->control &= ~(T_STOP);
        }

        if (t->control & T_RUN) {
            pktgen_run(t);
            t->control &= ~(T_RUN);
        }

        if (t->control & T_REMDEVALL) {
            pktgen_rem_all_ifs(t);
            t->control &= ~(T_REMDEVALL);
        }

        if (t->control & T_REMDEV) {
            pktgen_rem_one_if(t);
            t->control &= ~(T_REMDEV);
        }

        try_to_freeze();

        set_current_state(TASK_INTERRUPTIBLE);
    }

    pr_debug("%s stopping all device\n", t->tsk->comm);
    pktgen_stop(t);

    pr_debug("%s removing all device\n", t->tsk->comm);
    pktgen_rem_all_ifs(t);

    pr_debug("%s removing thread\n", t->tsk->comm);
    pktgen_rem_thread(t);

    /* Wait for kthread_stop */
    while (!kthread_should_stop()) {
        set_current_state(TASK_INTERRUPTIBLE);
        schedule();
    }
    __set_current_state(TASK_RUNNING);

    return 0;
}

static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t,
                      const char *ifname, bool exact)
{
    struct pktgen_dev *p, *pkt_dev = NULL;
    size_t len = strlen(ifname);

    if_lock(t);
    list_for_each_entry(p, &t->if_list, list)
        if (strncmp(p->odevname, ifname, len) == 0) {
            if (p->odevname[len]) {
                if (exact || p->odevname[len] != '@')
                    continue;
            }
            pkt_dev = p;
            break;
        }

    if_unlock(t);
    pr_debug("find_dev(%s) returning %p\n", ifname, pkt_dev);
    return pkt_dev;
}

/*
 * Adds a dev at front of if_list.
 */

static int add_dev_to_thread(struct pktgen_thread *t,
                 struct pktgen_dev *pkt_dev)
{
    int rv = 0;

    if_lock(t);

    if (pkt_dev->pg_thread) {
        pr_err("ERROR: already assigned to a thread\n");
        rv = -EBUSY;
        goto out;
    }

    list_add(&pkt_dev->list, &t->if_list);
    pkt_dev->pg_thread = t;
    pkt_dev->running = 0;

out:
    if_unlock(t);
    return rv;
}

/* Called under thread lock */

static int pktgen_add_device(struct pktgen_thread *t, const char *ifname)
{
    struct pktgen_dev *pkt_dev;
    int err;
    int node = cpu_to_node(t->cpu);

    /* We don't allow a device to be on several threads */

    pkt_dev = __pktgen_NN_threads(ifname, FIND);
    if (pkt_dev) {
        pr_err("ERROR: interface already used\n");
        return -EBUSY;
    }

    pkt_dev = kzalloc_node(sizeof(struct pktgen_dev), GFP_KERNEL, node);
    if (!pkt_dev)
        return -ENOMEM;

    strcpy(pkt_dev->odevname, ifname);
    pkt_dev->flows = vzalloc_node(MAX_CFLOWS * sizeof(struct flow_state),
                      node);
    if (pkt_dev->flows == NULL) {
        kfree(pkt_dev);
        return -ENOMEM;
    }

    pkt_dev->removal_mark = 0;
    pkt_dev->nfrags = 0;
    pkt_dev->delay = pg_delay_d;
    pkt_dev->count = pg_count_d;
    pkt_dev->sofar = 0;
    pkt_dev->udp_src_min = 9;   /* sink port */
    pkt_dev->udp_src_max = 9;
    pkt_dev->udp_dst_min = 9;
    pkt_dev->udp_dst_max = 9;
    pkt_dev->vlan_p = 0;
    pkt_dev->vlan_cfi = 0;
    pkt_dev->vlan_id = 0xffff;
    pkt_dev->svlan_p = 0;
    pkt_dev->svlan_cfi = 0;
    pkt_dev->svlan_id = 0xffff;
    pkt_dev->node = -1;

    err = pktgen_setup_dev(pkt_dev, ifname);
    if (err)
        goto out1;
    if (pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)
        pkt_dev->clone_skb = pg_clone_skb_d;

    pkt_dev->entry = proc_create_data(ifname, 0600, pg_proc_dir,
                      &pktgen_if_fops, pkt_dev);
    if (!pkt_dev->entry) {
        pr_err("cannot create %s/%s procfs entry\n",
               PG_PROC_DIR, ifname);
        err = -EINVAL;
        goto out2;
    }
#ifdef CONFIG_XFRM
    pkt_dev->ipsmode = XFRM_MODE_TRANSPORT;
    pkt_dev->ipsproto = IPPROTO_ESP;
#endif

    return add_dev_to_thread(t, pkt_dev);
out2:
    dev_put(pkt_dev->odev);
out1:
#ifdef CONFIG_XFRM
    free_SAs(pkt_dev);
#endif
    vfree(pkt_dev->flows);
    kfree(pkt_dev);
    return err;
}

static int __init pktgen_create_thread(int cpu)
{
    struct pktgen_thread *t;
    struct proc_dir_entry *pe;
    struct task_struct *p;

    t = kzalloc_node(sizeof(struct pktgen_thread), GFP_KERNEL,
             cpu_to_node(cpu));
    if (!t) {
        pr_err("ERROR: out of memory, can't create new thread\n");
        return -ENOMEM;
    }

    spin_lock_init(&t->if_lock);
    t->cpu = cpu;

    INIT_LIST_HEAD(&t->if_list);

    list_add_tail(&t->th_list, &pktgen_threads);
    init_completion(&t->start_done);

    p = kthread_create_on_node(pktgen_thread_worker,
                   t,
                   cpu_to_node(cpu),
                   "kpktgend_%d", cpu);
    if (IS_ERR(p)) {
        pr_err("kernel_thread() failed for cpu %d\n", t->cpu);
        list_del(&t->th_list);
        kfree(t);
        return PTR_ERR(p);
    }
    kthread_bind(p, cpu);
    t->tsk = p;

    pe = proc_create_data(t->tsk->comm, 0600, pg_proc_dir,
                  &pktgen_thread_fops, t);
    if (!pe) {
        pr_err("cannot create %s/%s procfs entry\n",
               PG_PROC_DIR, t->tsk->comm);
        kthread_stop(p);
        list_del(&t->th_list);
        kfree(t);
        return -EINVAL;
    }

    wake_up_process(p);
    wait_for_completion(&t->start_done);

    return 0;
}

/*
 * Removes a device from the thread if_list.
 */
static void _rem_dev_from_if_list(struct pktgen_thread *t,
                  struct pktgen_dev *pkt_dev)
{
    struct list_head *q, *n;
    struct pktgen_dev *p;

    list_for_each_safe(q, n, &t->if_list) {
        p = list_entry(q, struct pktgen_dev, list);
        if (p == pkt_dev)
            list_del(&p->list);
    }
}

static int pktgen_remove_device(struct pktgen_thread *t,
                struct pktgen_dev *pkt_dev)
{

    pr_debug("remove_device pkt_dev=%p\n", pkt_dev);

    if (pkt_dev->running) {
        pr_warning("WARNING: trying to remove a running interface, stopping it now\n");
        pktgen_stop_device(pkt_dev);
    }

    /* Dis-associate from the interface */

    if (pkt_dev->odev) {
        dev_put(pkt_dev->odev);
        pkt_dev->odev = NULL;
    }

    /* And update the thread if_list */

    _rem_dev_from_if_list(t, pkt_dev);

    if (pkt_dev->entry)
        remove_proc_entry(pkt_dev->entry->name, pg_proc_dir);

#ifdef CONFIG_XFRM
    free_SAs(pkt_dev);
#endif
    vfree(pkt_dev->flows);
    if (pkt_dev->page)
        put_page(pkt_dev->page);
    kfree(pkt_dev);
    return 0;
}

static int __init pg_init(void)
{
    int cpu;
    struct proc_dir_entry *pe;
    int ret = 0;

    pr_info("%s", version);

    pg_proc_dir = proc_mkdir(PG_PROC_DIR, init_net.proc_net);
    if (!pg_proc_dir)
        return -ENODEV;

    pe = proc_create(PGCTRL, 0600, pg_proc_dir, &pktgen_fops);
    if (pe == NULL) {
        pr_err("ERROR: cannot create %s procfs entry\n", PGCTRL);
        ret = -EINVAL;
        goto remove_dir;
    }

    register_netdevice_notifier(&pktgen_notifier_block);

    for_each_online_cpu(cpu) {
        int err;

        err = pktgen_create_thread(cpu);
        if (err)
            pr_warning("WARNING: Cannot create thread for cpu %d (%d)\n",
                   cpu, err);
    }

    if (list_empty(&pktgen_threads)) {
        pr_err("ERROR: Initialization failed for all threads\n");
        ret = -ENODEV;
        goto unregister;
    }

    return 0;

 unregister:
    unregister_netdevice_notifier(&pktgen_notifier_block);
    remove_proc_entry(PGCTRL, pg_proc_dir);
 remove_dir:
    proc_net_remove(&init_net, PG_PROC_DIR);
    return ret;
}

static void __exit pg_cleanup(void)
{
    struct pktgen_thread *t;
    struct list_head *q, *n;
    LIST_HEAD(list);

    /* Stop all interfaces & threads */
    pktgen_exiting = true;

    mutex_lock(&pktgen_thread_lock);
    list_splice_init(&pktgen_threads, &list);
    mutex_unlock(&pktgen_thread_lock);

    list_for_each_safe(q, n, &list) {
        t = list_entry(q, struct pktgen_thread, th_list);
        list_del(&t->th_list);
        kthread_stop(t->tsk);
        kfree(t);
    }

    /* Un-register us from receiving netdevice events */
    unregister_netdevice_notifier(&pktgen_notifier_block);

    /* Clean up proc file system */
    remove_proc_entry(PGCTRL, pg_proc_dir);
    proc_net_remove(&init_net, PG_PROC_DIR);
}

module_init(pg_init);
module_exit(pg_cleanup);

MODULE_AUTHOR("Robert Olsson <[email protected]>");
MODULE_DESCRIPTION("Packet Generator tool");
MODULE_LICENSE("GPL");
MODULE_VERSION(VERSION);
module_param(pg_count_d, int, 0);
MODULE_PARM_DESC(pg_count_d, "Default number of packets to inject");
module_param(pg_delay_d, int, 0);
MODULE_PARM_DESC(pg_delay_d, "Default delay between packets (nanoseconds)");
module_param(pg_clone_skb_d, int, 0);
MODULE_PARM_DESC(pg_clone_skb_d, "Default number of copies of the same packet");
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "Enable debugging of pktgen module");