Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 3896 insertions, 0 deletions

diff --git a/net/core/pktgen.c b/net/core/pktgen.c
new file mode 100644
index 000000000..c1e3d3bea
--- /dev/null
+++ b/net/core/pktgen.c
@@ -0,0 +1,3896 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Authors:
+ * Copyright 2001, 2002 by Robert Olsson <robert.olsson@its.uu.se>
+ *                             Uppsala University and
+ *                             Swedish University of Agricultural Sciences
+ *
+ * Alexey Kuznetsov  <kuznet@ms2.inr.ac.ru>
+ * Ben Greear <greearb@candelatech.com>
+ * Jens Låås <jens.laas@data.slu.se>
+ *
+ * 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:
+ *
+ * Jens.Laas@data.slu.se
+ * 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. 020417--sigurdur@linpro.no
+ * 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 <greearb@candelatech.com>
+ *
+ * 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 <greearb@candelatech.com>
+ *
+ * Integrated to 2.5.x 021029 --Lucio Maciel (luciomaciel@zipmail.com.br)
+ *
+ * 021124 Finished major redesign and rewrite for new functionality.
+ * See Documentation/networking/pktgen.rst 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_list is RCU protected, and the if_lock remains to protect updating
+ * of if_list, from "add_device" as it invoked from userspace (via proc write).
+ *
+ * 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 <grundler@parisc-linux.org>
+ *
+ * Remove if fix from added Harald Welte <laforge@netfilter.org> 040419
+ * ia64 compilation fix from  Aron Griffis <aron@hp.com> 040604
+ *
+ * New xmit() return, do_div and misc clean up by Stephen Hemminger
+ * <shemminger@osdl.org> 040923
+ *
+ * Randy Dunlap fixed u64 printk compiler warning
+ *
+ * Remove FCS from BW calculation.  Lennert Buytenhek <buytenh@wantstofly.org>
+ * New time handling. Lennert Buytenhek <buytenh@wantstofly.org> 041213
+ *
+ * Corrections from Nikolai Malykh (nmalykh@bilim.com)
+ * Removed unused flags F_SET_SRCMAC & F_SET_SRCIP 041230
+ *
+ * interruptible_sleep_on_timeout() replaced Nishanth Aravamudan <nacc@us.ibm.com>
+ * 050103
+ *
+ * MPLS support by Steven Whitehouse <steve@chygwyn.com>
+ *
+ * 802.1Q/Q-in-Q support by Francesco Fondelli (FF) <francesco.fondelli@gmail.com>
+ *
+ * Fixed src_mac command to set source mac of packet to value specified in
+ * command by Adit Ranadive <adit.262@gmail.com>
+ */
+
+#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 <linux/mmzone.h>
+#include <net/net_namespace.h>
+#include <net/checksum.h>
+#include <net/ipv6.h>
+#include <net/udp.h>
+#include <net/ip6_checksum.h>
+#include <net/addrconf.h>
+#ifdef CONFIG_XFRM
+#include <net/xfrm.h>
+#endif
+#include <net/netns/generic.h>
+#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	"2.75"
+#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__);
+
+#define PKT_FLAGS							\
+	pf(IPV6)		/* Interface in IPV6 Mode */		\
+	pf(IPSRC_RND)		/* IP-Src Random  */			\
+	pf(IPDST_RND)		/* IP-Dst Random  */			\
+	pf(TXSIZE_RND)		/* Transmit size is random */		\
+	pf(UDPSRC_RND)		/* UDP-Src Random */			\
+	pf(UDPDST_RND)		/* UDP-Dst Random */			\
+	pf(UDPCSUM)		/* Include UDP checksum */		\
+	pf(NO_TIMESTAMP)	/* Don't timestamp packets (default TS) */ \
+	pf(MPLS_RND)		/* Random MPLS labels */		\
+	pf(QUEUE_MAP_RND)	/* queue map Random */			\
+	pf(QUEUE_MAP_CPU)	/* queue map mirrors smp_processor_id() */ \
+	pf(FLOW_SEQ)		/* Sequential flows */			\
+	pf(IPSEC)		/* ipsec on for flows */		\
+	pf(MACSRC_RND)		/* MAC-Src Random */			\
+	pf(MACDST_RND)		/* MAC-Dst Random */			\
+	pf(VID_RND)		/* Random VLAN ID */			\
+	pf(SVID_RND)		/* Random SVLAN ID */			\
+	pf(NODE)		/* Node memory alloc*/			\
+
+#define pf(flag)		flag##_SHIFT,
+enum pkt_flags {
+	PKT_FLAGS
+};
+#undef pf
+
+/* Device flag bits */
+#define pf(flag)		static const __u32 F_##flag = (1<<flag##_SHIFT);
+PKT_FLAGS
+#undef pf
+
+#define pf(flag)		__stringify(flag),
+static char *pkt_flag_names[] = {
+	PKT_FLAGS
+};
+#undef pf
+
+#define NR_PKT_FLAGS		ARRAY_SIZE(pkt_flag_names)
+
+/* 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 */
+
+/* Xmit modes */
+#define M_START_XMIT		0	/* Default normal TX */
+#define M_NETIF_RECEIVE 	1	/* Inject packets into stack */
+#define M_QUEUE_XMIT		2	/* Inject packet into qdisc */
+
+/* If lock -- protects updating of if_list */
+#define   if_lock(t)           mutex_lock(&(t->if_lock));
+#define   if_unlock(t)           mutex_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"
+
+#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 */
+	struct rcu_head	 rcu;		/* freed by RCU */
+
+	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 xmit_mode;
+	int min_pkt_size;
+	int max_pkt_size;
+	int pkt_overhead;	/* overhead for MPLS, VLANs, IPSEC etc */
+	int nfrags;
+	int removal_mark;	/* non-zero => the device is marked for
+				 * removal by worker thread */
+
+	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 */
+
+	__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 */
+	unsigned int burst;	/* number of duplicated packets to burst */
+	int node;               /* Memory node */
+
+#ifdef CONFIG_XFRM
+	__u8	ipsmode;		/* IPSEC mode (config) */
+	__u8	ipsproto;		/* IPSEC type (config) */
+	__u32	spi;
+	struct xfrm_dst xdst;
+	struct dst_ops dstops;
+#endif
+	char result[512];
+};
+
+struct pktgen_hdr {
+	__be32 pgh_magic;
+	__be32 seq_num;
+	__be32 tv_sec;
+	__be32 tv_usec;
+};
+
+
+static unsigned int pg_net_id __read_mostly;
+
+struct pktgen_net {
+	struct net		*net;
+	struct proc_dir_entry	*proc_dir;
+	struct list_head	pktgen_threads;
+	bool			pktgen_exiting;
+};
+
+struct pktgen_thread {
+	struct mutex 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;
+	struct pktgen_net *net;
+};
+
+#define REMOVE 1
+#define FIND   0
+
+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(struct pktgen_net *pn);
+static void pktgen_reset_all_threads(struct pktgen_net *pn);
+static void pktgen_stop_all_threads_ifs(struct pktgen_net *pn);
+
+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 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)
+{
+	char data[128];
+	struct pktgen_net *pn = net_generic(current->nsproxy->net_ns, pg_net_id);
+
+	if (!capable(CAP_NET_ADMIN))
+		return -EPERM;
+
+	if (count == 0)
+		return -EINVAL;
+
+	if (count > sizeof(data))
+		count = sizeof(data);
+
+	if (copy_from_user(data, buf, count))
+		return -EFAULT;
+
+	data[count - 1] = 0;	/* Strip trailing '\n' and terminate string */
+
+	if (!strcmp(data, "stop"))
+		pktgen_stop_all_threads_ifs(pn);
+
+	else if (!strcmp(data, "start"))
+		pktgen_run_all_threads(pn);
+
+	else if (!strcmp(data, "reset"))
+		pktgen_reset_all_threads(pn);
+
+	else
+		return -EINVAL;
+
+	return count;
+}
+
+static int pgctrl_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, pgctrl_show, PDE_DATA(inode));
+}
+
+static const struct proc_ops pktgen_proc_ops = {
+	.proc_open	= pgctrl_open,
+	.proc_read	= seq_read,
+	.proc_lseek	= seq_lseek,
+	.proc_write	= pgctrl_write,
+	.proc_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;
+	unsigned int i;
+	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_puts(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) {
+		seq_puts(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->burst > 1)
+		seq_printf(seq, "     burst: %d\n", pkt_dev->burst);
+
+	if (pkt_dev->node >= 0)
+		seq_printf(seq, "     node: %d\n", pkt_dev->node);
+
+	if (pkt_dev->xmit_mode == M_NETIF_RECEIVE)
+		seq_puts(seq, "     xmit_mode: netif_receive\n");
+	else if (pkt_dev->xmit_mode == M_QUEUE_XMIT)
+		seq_puts(seq, "     xmit_mode: xmit_queue\n");
+
+	seq_puts(seq, "     Flags: ");
+
+	for (i = 0; i < NR_PKT_FLAGS; i++) {
+		if (i == FLOW_SEQ_SHIFT)
+			if (!pkt_dev->cflows)
+				continue;
+
+		if (pkt_dev->flags & (1 << i)) {
+			seq_printf(seq, "%s  ", pkt_flag_names[i]);
+#ifdef CONFIG_XFRM
+			if (i == IPSEC_SHIFT && pkt_dev->spi)
+				seq_printf(seq, "spi:%u  ", pkt_dev->spi);
+#endif
+		} else if (i == FLOW_SEQ_SHIFT) {
+			seq_puts(seq, "FLOW_RND  ");
+		}
+	}
+
+	seq_puts(seq, "\n");
+
+	/* not really stopped, more like last-running-at */
+	stopped = pkt_dev->running ? ktime_get() : 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_puts(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;
+		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 __u32 pktgen_read_flag(const char *f, bool *disable)
+{
+	__u32 i;
+
+	if (f[0] == '!') {
+		*disable = true;
+		f++;
+	}
+
+	for (i = 0; i < NR_PKT_FLAGS; i++) {
+		if (!IS_ENABLED(CONFIG_XFRM) && i == IPSEC_SHIFT)
+			continue;
+
+		/* allow only disabling ipv6 flag */
+		if (!*disable && i == IPV6_SHIFT)
+			continue;
+
+		if (strcmp(f, pkt_flag_names[i]) == 0)
+			return 1 << i;
+	}
+
+	if (strcmp(f, "FLOW_RND") == 0) {
+		*disable = !*disable;
+		return F_FLOW_SEQ;
+	}
+
+	return 0;
+}
+
+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_warn("wrong command format\n");
+		return -EINVAL;
+	}
+
+	max = count;
+	tmp = count_trail_chars(user_buffer, max);
+	if (tmp < 0) {
+		pr_warn("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 + 1, 1024);
+		char *tp = strndup_user(user_buffer, copy);
+
+		if (IS_ERR(tp))
+			return PTR_ERR(tp);
+
+		pr_debug("%s,%zu  buffer -:%s:-\n", name, count, tp);
+		kfree(tp);
+	}
+
+	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=%d",
+			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=%d",
+			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=%d", 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=%d", 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->xmit_mode == M_NETIF_RECEIVE) ||
+		     !(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, "burst")) {
+		len = num_arg(&user_buffer[i], 10, &value);
+		if (len < 0)
+			return len;
+
+		i += len;
+		if ((value > 1) &&
+		    ((pkt_dev->xmit_mode == M_QUEUE_XMIT) ||
+		     ((pkt_dev->xmit_mode == M_START_XMIT) &&
+		     (!(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)))))
+			return -ENOTSUPP;
+		pkt_dev->burst = value < 1 ? 1 : value;
+		sprintf(pg_result, "OK: burst=%u", pkt_dev->burst);
+		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, "xmit_mode")) {
+		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, "start_xmit") == 0) {
+			pkt_dev->xmit_mode = M_START_XMIT;
+		} else if (strcmp(f, "netif_receive") == 0) {
+			/* clone_skb set earlier, not supported in this mode */
+			if (pkt_dev->clone_skb > 0)
+				return -ENOTSUPP;
+
+			pkt_dev->xmit_mode = M_NETIF_RECEIVE;
+
+			/* make sure new packet is allocated every time
+			 * pktgen_xmit() is called
+			 */
+			pkt_dev->last_ok = 1;
+
+			/* override clone_skb if user passed default value
+			 * at module loading time
+			 */
+			pkt_dev->clone_skb = 0;
+		} else if (strcmp(f, "queue_xmit") == 0) {
+			pkt_dev->xmit_mode = M_QUEUE_XMIT;
+			pkt_dev->last_ok = 1;
+		} else {
+			sprintf(pg_result,
+				"xmit_mode -:%s:- unknown\nAvailable modes: %s",
+				f, "start_xmit, netif_receive\n");
+			return count;
+		}
+		sprintf(pg_result, "OK: xmit_mode=%s", f);
+		return count;
+	}
+	if (!strcmp(name, "flag")) {
+		__u32 flag;
+		char f[32];
+		bool disable = false;
+
+		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;
+
+		flag = pktgen_read_flag(f, &disable);
+
+		if (flag) {
+			if (disable)
+				pkt_dev->flags &= ~flag;
+			else
+				pkt_dev->flags |= flag;
+		} 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, "
+				"QUEUE_MAP_RND, QUEUE_MAP_CPU, UDPCSUM, "
+				"NO_TIMESTAMP, "
+#ifdef CONFIG_XFRM
+				"IPSEC, "
+#endif
+				"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));
+			strcpy(pkt_dev->dst_min, buf);
+			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));
+			strcpy(pkt_dev->dst_max, buf);
+			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));
+			strcpy(pkt_dev->src_min, buf);
+			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));
+			strcpy(pkt_dev->src_max, buf);
+			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 */
+		ether_addr_copy(&pkt_dev->hh[0], pkt_dev->dst_mac);
+
+		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 */
+		ether_addr_copy(&pkt_dev->hh[6], pkt_dev->src_mac);
+
+		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;
+	}
+#ifdef CONFIG_XFRM
+	if (!strcmp(name, "spi")) {
+		len = num_arg(&user_buffer[i], 10, &value);
+		if (len < 0)
+			return len;
+
+		i += len;
+		pkt_dev->spi = value;
+		sprintf(pg_result, "OK: spi=%u", pkt_dev->spi);
+		return count;
+	}
+#endif
+	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_DATA(inode));
+}
+
+static const struct proc_ops pktgen_if_proc_ops = {
+	.proc_open	= pktgen_if_open,
+	.proc_read	= seq_read,
+	.proc_lseek	= seq_lseek,
+	.proc_write	= pktgen_if_write,
+	.proc_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_puts(seq, "Running: ");
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(pkt_dev, &t->if_list, list)
+		if (pkt_dev->running)
+			seq_printf(seq, "%s ", pkt_dev->odevname);
+
+	seq_puts(seq, "\nStopped: ");
+
+	list_for_each_entry_rcu(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_puts(seq, "\nResult: NA\n");
+
+	rcu_read_unlock();
+
+	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);
+		ret = pktgen_add_device(t, f);
+		mutex_unlock(&pktgen_thread_lock);
+		if (!ret) {
+			ret = count;
+			sprintf(pg_result, "OK: add_device=%s", f);
+		} else
+			sprintf(pg_result, "ERROR: can not 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_DATA(inode));
+}
+
+static const struct proc_ops pktgen_thread_proc_ops = {
+	.proc_open	= pktgen_thread_open,
+	.proc_read	= seq_read,
+	.proc_lseek	= seq_lseek,
+	.proc_write	= pktgen_thread_write,
+	.proc_release	= single_release,
+};
+
+/* Think find or remove for NN */
+static struct pktgen_dev *__pktgen_NN_threads(const struct pktgen_net *pn,
+					      const char *ifname, int remove)
+{
+	struct pktgen_thread *t;
+	struct pktgen_dev *pkt_dev = NULL;
+	bool exact = (remove == FIND);
+
+	list_for_each_entry(t, &pn->pktgen_threads, th_list) {
+		pkt_dev = pktgen_find_dev(t, ifname, exact);
+		if (pkt_dev) {
+			if (remove) {
+				pkt_dev->removal_mark = 1;
+				t->control |= T_REMDEV;
+			}
+			break;
+		}
+	}
+	return pkt_dev;
+}
+
+/*
+ * mark a device for removal
+ */
+static void pktgen_mark_device(const struct pktgen_net *pn, 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(pn, 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(const struct pktgen_net *pn, struct net_device *dev)
+{
+	struct pktgen_thread *t;
+
+	mutex_lock(&pktgen_thread_lock);
+
+	list_for_each_entry(t, &pn->pktgen_threads, th_list) {
+		struct pktgen_dev *pkt_dev;
+
+		if_lock(t);
+		list_for_each_entry(pkt_dev, &t->if_list, list) {
+			if (pkt_dev->odev != dev)
+				continue;
+
+			proc_remove(pkt_dev->entry);
+
+			pkt_dev->entry = proc_create_data(dev->name, 0600,
+							  pn->proc_dir,
+							  &pktgen_if_proc_ops,
+							  pkt_dev);
+			if (!pkt_dev->entry)
+				pr_err("can't move proc entry for '%s'\n",
+				       dev->name);
+			break;
+		}
+		if_unlock(t);
+	}
+	mutex_unlock(&pktgen_thread_lock);
+}
+
+static int pktgen_device_event(struct notifier_block *unused,
+			       unsigned long event, void *ptr)
+{
+	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+	struct pktgen_net *pn = net_generic(dev_net(dev), pg_net_id);
+
+	if (pn->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(pn, dev);
+		break;
+
+	case NETDEV_UNREGISTER:
+		pktgen_mark_device(pn, dev->name);
+		break;
+	}
+
+	return NOTIFY_DONE;
+}
+
+static struct net_device *pktgen_dev_get_by_name(const struct pktgen_net *pn,
+						 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(pn->net, b);
+}
+
+
+/* Associate pktgen_dev with a device. */
+
+static int pktgen_setup_dev(const struct pktgen_net *pn,
+			    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(pn, pkt_dev, ifname);
+	if (!odev) {
+		pr_err("no such netdevice: \"%s\"\n", ifname);
+		return -ENODEV;
+	}
+
+	if (odev->type != ARPHRD_ETHER && odev->type != ARPHRD_LOOPBACK) {
+		pr_err("not an ethernet or loopback 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_warn("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_warn("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))
+		ether_addr_copy(&(pkt_dev->hh[6]), pkt_dev->odev->dev_addr);
+
+	/* Set up Dest MAC */
+	ether_addr_copy(&(pkt_dev->hh[0]), pkt_dev->dst_mac);
+
+	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 < sizeof(struct in6_addr); 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) {
+				const struct in_ifaddr *ifa;
+
+				ifa = rcu_dereference(in_dev->ifa_list);
+				if (ifa) {
+					pkt_dev->saddr_min = ifa->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_sleeper_on_stack(&t, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
+	hrtimer_set_expires(&t.timer, spin_until);
+
+	remaining = ktime_to_ns(hrtimer_expires_remaining(&t.timer));
+	if (remaining <= 0)
+		goto out;
+
+	start_time = ktime_get();
+	if (remaining < 100000) {
+		/* for small delays (<100us), just loop until limit is reached */
+		do {
+			end_time = ktime_get();
+		} while (ktime_compare(end_time, spin_until) < 0);
+	} else {
+		do {
+			set_current_state(TASK_INTERRUPTIBLE);
+			hrtimer_sleeper_start_expires(&t, HRTIMER_MODE_ABS);
+
+			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_get();
+	}
+
+	pkt_dev->idle_acc += ktime_to_ns(ktime_sub(end_time, start_time));
+out:
+	pkt_dev->next_tx = ktime_add_ns(spin_until, pkt_dev->delay);
+	destroy_hrtimer_on_stack(&t.timer);
+}
+
+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 = prandom_u32() % 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;
+	struct pktgen_net *pn = net_generic(dev_net(pkt_dev->odev), pg_net_id);
+	if (!x) {
+
+		if (pkt_dev->spi) {
+			/* We need as quick as possible to find the right SA
+			 * Searching with minimum criteria to archieve this.
+			 */
+			x = xfrm_state_lookup_byspi(pn->net, htonl(pkt_dev->spi), AF_INET);
+		} else {
+			/* slow path: we dont already have xfrm_state */
+			x = xfrm_stateonly_find(pn->net, DUMMY_MARK, 0,
+						(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 = prandom_u32() %
+				(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 = prandom_u32() % 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 = prandom_u32() % 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)prandom_u32() &
+						      htonl(0x000fffff));
+	}
+
+	if ((pkt_dev->flags & F_VID_RND) && (pkt_dev->vlan_id != 0xffff)) {
+		pkt_dev->vlan_id = prandom_u32() & (4096 - 1);
+	}
+
+	if ((pkt_dev->flags & F_SVID_RND) && (pkt_dev->svlan_id != 0xffff)) {
+		pkt_dev->svlan_id = prandom_u32() & (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 = prandom_u32() %
+				(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 = prandom_u32() %
+				(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 = prandom_u32() % (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) {
+
+					do {
+						t = prandom_u32() %
+							(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));
+					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)
+					get_ipsec_sa(pkt_dev, flow);
+#endif
+				pkt_dev->nflows++;
+			}
+		}
+	} else {		/* IPV6 * */
+
+		if (!ipv6_addr_any(&pkt_dev->min_in6_daddr)) {
+			int i;
+
+			/* Only random destinations yet */
+
+			for (i = 0; i < 4; i++) {
+				pkt_dev->cur_in6_daddr.s6_addr32[i] =
+				    (((__force __be32)prandom_u32() |
+				      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 = prandom_u32() %
+				(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 u32 pktgen_dst_metrics[RTAX_MAX + 1] = {
+
+	[RTAX_HOPLIMIT] = 0x5, /* Set a static hoplimit */
+};
+
+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;
+	struct net *net = dev_net(pkt_dev->odev);
+
+	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) && (pkt_dev->spi == 0))
+		return 0;
+
+	/* But when user specify an valid SPI, transformation
+	 * supports both transport/tunnel mode + ESP/AH type.
+	 */
+	if ((x->props.mode == XFRM_MODE_TUNNEL) && (pkt_dev->spi != 0))
+		skb->_skb_refdst = (unsigned long)&pkt_dev->xdst.u.dst | SKB_DST_NOREF;
+
+	rcu_read_lock_bh();
+	err = pktgen_xfrm_outer_mode_output(x, skb);
+	rcu_read_unlock_bh();
+	if (err) {
+		XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEMODEERROR);
+		goto error;
+	}
+	err = x->type->output(x, skb);
+	if (err) {
+		XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEPROTOERROR);
+		goto error;
+	}
+	spin_lock_bh(&x->lock);
+	x->curlft.bytes += skb->len;
+	x->curlft.packets++;
+	spin_unlock_bh(&x->lock);
+error:
+	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) {
+		struct xfrm_state *x = pkt_dev->flows[pkt_dev->curfl].x;
+		int nhead = 0;
+		if (x) {
+			struct ethhdr *eth;
+			struct iphdr *iph;
+			int ret;
+
+			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 = skb_push(skb, ETH_HLEN);
+			memcpy(eth, pkt_dev->hh, 2 * ETH_ALEN);
+			eth->h_proto = protocol;
+
+			/* Update IPv4 header len as well as checksum value */
+			iph = ip_hdr(skb);
+			iph->tot_len = htons(skb->len - ETH_HLEN);
+			ip_send_check(iph);
+		}
+	}
+	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 timespec64 timestamp;
+	struct pktgen_hdr *pgh;
+
+	pgh = skb_put(skb, sizeof(*pgh));
+	datalen -= sizeof(*pgh);
+
+	if (pkt_dev->nfrags <= 0) {
+		skb_put_zero(skb, 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) {
+			skb_put_zero(skb, 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_frag_off_set(&skb_shinfo(skb)->frags[i], 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);
+
+	if (pkt_dev->flags & F_NO_TIMESTAMP) {
+		pgh->tv_sec = 0;
+		pgh->tv_usec = 0;
+	} else {
+		/*
+		 * pgh->tv_sec wraps in y2106 when interpreted as unsigned
+		 * as done by wireshark, or y2038 when interpreted as signed.
+		 * This is probably harmless, but if anyone wants to improve
+		 * it, we could introduce a variant that puts 64-bit nanoseconds
+		 * into the respective header bytes.
+		 * This would also be slightly faster to read.
+		 */
+		ktime_get_real_ts64(&timestamp);
+		pgh->tv_sec = htonl(timestamp.tv_sec);
+		pgh->tv_usec = htonl(timestamp.tv_nsec / NSEC_PER_USEC);
+	}
+}
+
+static struct sk_buff *pktgen_alloc_skb(struct net_device *dev,
+					struct pktgen_dev *pkt_dev)
+{
+	unsigned int extralen = LL_RESERVED_SPACE(dev);
+	struct sk_buff *skb = NULL;
+	unsigned int size;
+
+	size = pkt_dev->cur_pkt_size + 64 + extralen + pkt_dev->pkt_overhead;
+	if (pkt_dev->flags & F_NODE) {
+		int node = pkt_dev->node >= 0 ? pkt_dev->node : numa_node_id();
+
+		skb = __alloc_skb(NET_SKB_PAD + size, GFP_NOWAIT, 0, node);
+		if (likely(skb)) {
+			skb_reserve(skb, NET_SKB_PAD);
+			skb->dev = dev;
+		}
+	} else {
+		 skb = __netdev_alloc_skb(dev, size, GFP_NOWAIT);
+	}
+
+	/* the caller pre-fetches from skb->data and reserves for the mac hdr */
+	if (likely(skb))
+		skb_reserve(skb, extralen - 16);
+
+	return skb;
+}
+
+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;
+
+	skb = pktgen_alloc_skb(odev, pkt_dev);
+	if (!skb) {
+		sprintf(pkt_dev->result, "No memory");
+		return NULL;
+	}
+
+	prefetchw(skb->data);
+	skb_reserve(skb, 16);
+
+	/*  Reserve for ethernet and IP header  */
+	eth = skb_push(skb, 14);
+	mpls = 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 = skb_put(skb, sizeof(__be16));
+			*svlan_tci = build_tci(pkt_dev->svlan_id,
+					       pkt_dev->svlan_cfi,
+					       pkt_dev->svlan_p);
+			svlan_encapsulated_proto = skb_put(skb,
+							   sizeof(__be16));
+			*svlan_encapsulated_proto = htons(ETH_P_8021Q);
+		}
+		vlan_tci = skb_put(skb, sizeof(__be16));
+		*vlan_tci = build_tci(pkt_dev->vlan_id,
+				      pkt_dev->vlan_cfi,
+				      pkt_dev->vlan_p);
+		vlan_encapsulated_proto = skb_put(skb, sizeof(__be16));
+		*vlan_encapsulated_proto = htons(ETH_P_IP);
+	}
+
+	skb_reset_mac_header(skb);
+	skb_set_network_header(skb, skb->len);
+	iph = skb_put(skb, sizeof(struct iphdr));
+
+	skb_set_transport_header(skb, skb->len);
+	udph = skb_put(skb, sizeof(struct udphdr));
+	skb_set_queue_mapping(skb, queue_map);
+	skb->priority = pkt_dev->skb_priority;
+
+	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;
+
+	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);
+	ip_send_check(iph);
+	skb->protocol = protocol;
+	skb->dev = odev;
+	skb->pkt_type = PACKET_HOST;
+
+	pktgen_finalize_skb(pkt_dev, skb, datalen);
+
+	if (!(pkt_dev->flags & F_UDPCSUM)) {
+		skb->ip_summed = CHECKSUM_NONE;
+	} else if (odev->features & (NETIF_F_HW_CSUM | NETIF_F_IP_CSUM)) {
+		skb->ip_summed = CHECKSUM_PARTIAL;
+		skb->csum = 0;
+		udp4_hwcsum(skb, iph->saddr, iph->daddr);
+	} else {
+		__wsum csum = skb_checksum(skb, skb_transport_offset(skb), datalen + 8, 0);
+
+		/* add protocol-dependent pseudo-header */
+		udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
+						datalen + 8, IPPROTO_UDP, csum);
+
+		if (udph->check == 0)
+			udph->check = CSUM_MANGLED_0;
+	}
+
+#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, udplen;
+	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 = pktgen_alloc_skb(odev, pkt_dev);
+	if (!skb) {
+		sprintf(pkt_dev->result, "No memory");
+		return NULL;
+	}
+
+	prefetchw(skb->data);
+	skb_reserve(skb, 16);
+
+	/*  Reserve for ethernet and IP header  */
+	eth = skb_push(skb, 14);
+	mpls = 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 = skb_put(skb, sizeof(__be16));
+			*svlan_tci = build_tci(pkt_dev->svlan_id,
+					       pkt_dev->svlan_cfi,
+					       pkt_dev->svlan_p);
+			svlan_encapsulated_proto = skb_put(skb,
+							   sizeof(__be16));
+			*svlan_encapsulated_proto = htons(ETH_P_8021Q);
+		}
+		vlan_tci = skb_put(skb, sizeof(__be16));
+		*vlan_tci = build_tci(pkt_dev->vlan_id,
+				      pkt_dev->vlan_cfi,
+				      pkt_dev->vlan_p);
+		vlan_encapsulated_proto = skb_put(skb, sizeof(__be16));
+		*vlan_encapsulated_proto = htons(ETH_P_IPV6);
+	}
+
+	skb_reset_mac_header(skb);
+	skb_set_network_header(skb, skb->len);
+	iph = skb_put(skb, sizeof(struct ipv6hdr));
+
+	skb_set_transport_header(skb, skb->len);
+	udph = skb_put(skb, sizeof(struct udphdr));
+	skb_set_queue_mapping(skb, queue_map);
+	skb->priority = pkt_dev->skb_priority;
+
+	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);
+	}
+
+	udplen = datalen + sizeof(struct udphdr);
+	udph->source = htons(pkt_dev->cur_udp_src);
+	udph->dest = htons(pkt_dev->cur_udp_dst);
+	udph->len = htons(udplen);
+	udph->check = 0;
+
+	*(__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(udplen);
+	iph->nexthdr = IPPROTO_UDP;
+
+	iph->daddr = pkt_dev->cur_in6_daddr;
+	iph->saddr = pkt_dev->cur_in6_saddr;
+
+	skb->protocol = protocol;
+	skb->dev = odev;
+	skb->pkt_type = PACKET_HOST;
+
+	pktgen_finalize_skb(pkt_dev, skb, datalen);
+
+	if (!(pkt_dev->flags & F_UDPCSUM)) {
+		skb->ip_summed = CHECKSUM_NONE;
+	} else if (odev->features & (NETIF_F_HW_CSUM | NETIF_F_IPV6_CSUM)) {
+		skb->ip_summed = CHECKSUM_PARTIAL;
+		skb->csum_start = skb_transport_header(skb) - skb->head;
+		skb->csum_offset = offsetof(struct udphdr, check);
+		udph->check = ~csum_ipv6_magic(&iph->saddr, &iph->daddr, udplen, IPPROTO_UDP, 0);
+	} else {
+		__wsum csum = skb_checksum(skb, skb_transport_offset(skb), udplen, 0);
+
+		/* add protocol-dependent pseudo-header */
+		udph->check = csum_ipv6_magic(&iph->saddr, &iph->daddr, udplen, IPPROTO_UDP, csum);
+
+		if (udph->check == 0)
+			udph->check = CSUM_MANGLED_0;
+	}
+
+	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();
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(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->skb = NULL;
+			pkt_dev->started_at = pkt_dev->next_tx = ktime_get();
+
+			set_pkt_overhead(pkt_dev);
+
+			strcpy(pkt_dev->result, "Starting");
+			pkt_dev->running = 1;	/* Cranke yeself! */
+			started++;
+		} else
+			strcpy(pkt_dev->result, "Error starting");
+	}
+	rcu_read_unlock();
+	if (started)
+		t->control &= ~(T_STOP);
+}
+
+static void pktgen_stop_all_threads_ifs(struct pktgen_net *pn)
+{
+	struct pktgen_thread *t;
+
+	func_enter();
+
+	mutex_lock(&pktgen_thread_lock);
+
+	list_for_each_entry(t, &pn->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;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(pkt_dev, &t->if_list, list)
+		if (pkt_dev->running) {
+			rcu_read_unlock();
+			return 1;
+		}
+	rcu_read_unlock();
+	return 0;
+}
+
+static int pktgen_wait_thread_run(struct pktgen_thread *t)
+{
+	while (thread_is_running(t)) {
+
+		/* note: 't' will still be around even after the unlock/lock
+		 * cycle because pktgen_thread threads are only cleared at
+		 * net exit
+		 */
+		mutex_unlock(&pktgen_thread_lock);
+		msleep_interruptible(100);
+		mutex_lock(&pktgen_thread_lock);
+
+		if (signal_pending(current))
+			goto signal;
+	}
+	return 1;
+signal:
+	return 0;
+}
+
+static int pktgen_wait_all_threads_run(struct pktgen_net *pn)
+{
+	struct pktgen_thread *t;
+	int sig = 1;
+
+	/* prevent from racing with rmmod */
+	if (!try_module_get(THIS_MODULE))
+		return sig;
+
+	mutex_lock(&pktgen_thread_lock);
+
+	list_for_each_entry(t, &pn->pktgen_threads, th_list) {
+		sig = pktgen_wait_thread_run(t);
+		if (sig == 0)
+			break;
+	}
+
+	if (sig == 0)
+		list_for_each_entry(t, &pn->pktgen_threads, th_list)
+			t->control |= (T_STOP);
+
+	mutex_unlock(&pktgen_thread_lock);
+	module_put(THIS_MODULE);
+	return sig;
+}
+
+static void pktgen_run_all_threads(struct pktgen_net *pn)
+{
+	struct pktgen_thread *t;
+
+	func_enter();
+
+	mutex_lock(&pktgen_thread_lock);
+
+	list_for_each_entry(t, &pn->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(pn);
+}
+
+static void pktgen_reset_all_threads(struct pktgen_net *pn)
+{
+	struct pktgen_thread *t;
+
+	func_enter();
+
+	mutex_lock(&pktgen_thread_lock);
+
+	list_for_each_entry(t, &pn->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(pn);
+}
+
+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_warn("interface: %s is already stopped\n",
+			pkt_dev->odevname);
+		return -EINVAL;
+	}
+
+	pkt_dev->running = 0;
+	kfree_skb(pkt_dev->skb);
+	pkt_dev->skb = NULL;
+	pkt_dev->stopped_at = ktime_get();
+
+	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;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(pkt_dev, &t->if_list, list) {
+		if (!pkt_dev->running)
+			continue;
+		if (best == NULL)
+			best = pkt_dev;
+		else if (ktime_compare(pkt_dev->next_tx, best->next_tx) < 0)
+			best = pkt_dev;
+	}
+	rcu_read_unlock();
+
+	return best;
+}
+
+static void pktgen_stop(struct pktgen_thread *t)
+{
+	struct pktgen_dev *pkt_dev;
+
+	func_enter();
+
+	rcu_read_lock();
+
+	list_for_each_entry_rcu(pkt_dev, &t->if_list, list) {
+		pktgen_stop_device(pkt_dev);
+	}
+
+	rcu_read_unlock();
+}
+
+/*
+ * 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();
+
+	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;
+	}
+}
+
+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 */
+
+	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);
+	}
+}
+
+static void pktgen_rem_thread(struct pktgen_thread *t)
+{
+	/* Remove from the thread list */
+	remove_proc_entry(t->tsk->comm, t->net->proc_dir);
+}
+
+static void pktgen_resched(struct pktgen_dev *pkt_dev)
+{
+	ktime_t idle_start = ktime_get();
+	schedule();
+	pkt_dev->idle_acc += ktime_to_ns(ktime_sub(ktime_get(), idle_start));
+}
+
+static void pktgen_wait_for_skb(struct pktgen_dev *pkt_dev)
+{
+	ktime_t idle_start = ktime_get();
+
+	while (refcount_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_get(), idle_start));
+}
+
+static void pktgen_xmit(struct pktgen_dev *pkt_dev)
+{
+	unsigned int burst = READ_ONCE(pkt_dev->burst);
+	struct net_device *odev = pkt_dev->odev;
+	struct netdev_queue *txq;
+	struct sk_buff *skb;
+	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_get(), 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->clone_count = 0;	/* reset counter */
+	}
+
+	if (pkt_dev->delay && pkt_dev->last_ok)
+		spin(pkt_dev, pkt_dev->next_tx);
+
+	if (pkt_dev->xmit_mode == M_NETIF_RECEIVE) {
+		skb = pkt_dev->skb;
+		skb->protocol = eth_type_trans(skb, skb->dev);
+		refcount_add(burst, &skb->users);
+		local_bh_disable();
+		do {
+			ret = netif_receive_skb(skb);
+			if (ret == NET_RX_DROP)
+				pkt_dev->errors++;
+			pkt_dev->sofar++;
+			pkt_dev->seq_num++;
+			if (refcount_read(&skb->users) != burst) {
+				/* skb was queued by rps/rfs or taps,
+				 * so cannot reuse this skb
+				 */
+				WARN_ON(refcount_sub_and_test(burst - 1, &skb->users));
+				/* get out of the loop and wait
+				 * until skb is consumed
+				 */
+				break;
+			}
+			/* skb was 'freed' by stack, so clean few
+			 * bits and reuse it
+			 */
+			skb_reset_redirect(skb);
+		} while (--burst > 0);
+		goto out; /* Skips xmit_mode M_START_XMIT */
+	} else if (pkt_dev->xmit_mode == M_QUEUE_XMIT) {
+		local_bh_disable();
+		refcount_inc(&pkt_dev->skb->users);
+
+		ret = dev_queue_xmit(pkt_dev->skb);
+		switch (ret) {
+		case NET_XMIT_SUCCESS:
+			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:
+		/* These are all valid return codes for a qdisc but
+		 * indicate packets are being dropped or will likely
+		 * be dropped soon.
+		 */
+		case NETDEV_TX_BUSY:
+		/* qdisc may call dev_hard_start_xmit directly in cases
+		 * where no queues exist e.g. loopback device, virtual
+		 * devices, etc. In this case we need to handle
+		 * NETDEV_TX_ codes.
+		 */
+		default:
+			pkt_dev->errors++;
+			net_info_ratelimited("%s xmit error: %d\n",
+					     pkt_dev->odevname, ret);
+			break;
+		}
+		goto out;
+	}
+
+	txq = skb_get_tx_queue(odev, pkt_dev->skb);
+
+	local_bh_disable();
+
+	HARD_TX_LOCK(odev, txq, smp_processor_id());
+
+	if (unlikely(netif_xmit_frozen_or_drv_stopped(txq))) {
+		pkt_dev->last_ok = 0;
+		goto unlock;
+	}
+	refcount_add(burst, &pkt_dev->skb->users);
+
+xmit_more:
+	ret = netdev_start_xmit(pkt_dev->skb, odev, txq, --burst > 0);
+
+	switch (ret) {
+	case NETDEV_TX_OK:
+		pkt_dev->last_ok = 1;
+		pkt_dev->sofar++;
+		pkt_dev->seq_num++;
+		pkt_dev->tx_bytes += pkt_dev->last_pkt_size;
+		if (burst > 0 && !netif_xmit_frozen_or_drv_stopped(txq))
+			goto xmit_more;
+		break;
+	case NET_XMIT_DROP:
+	case NET_XMIT_CN:
+		/* 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++;
+		fallthrough;
+	case NETDEV_TX_BUSY:
+		/* Retry it next time */
+		refcount_dec(&(pkt_dev->skb->users));
+		pkt_dev->last_ok = 0;
+	}
+	if (unlikely(burst))
+		WARN_ON(refcount_sub_and_test(burst, &pkt_dev->skb->users));
+unlock:
+	HARD_TX_UNLOCK(odev, txq);
+
+out:
+	local_bh_enable();
+
+	/* 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;
+
+	WARN_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_freezable();
+
+	while (!kthread_should_stop()) {
+		pkt_dev = next_to_run(t);
+
+		if (unlikely(!pkt_dev && t->control == 0)) {
+			if (t->net->pktgen_exiting)
+				break;
+			wait_event_interruptible_timeout(t->queue,
+							 t->control != 0,
+							 HZ/10);
+			try_to_freeze();
+			continue;
+		}
+
+		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();
+	}
+
+	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);
+
+	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);
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(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;
+		}
+
+	rcu_read_unlock();
+	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;
+
+	/* This function cannot be called concurrently, as its called
+	 * under pktgen_thread_lock mutex, but it can run from
+	 * userspace on another CPU than the kthread.  The if_lock()
+	 * is used here to sync with concurrent instances of
+	 * _rem_dev_from_if_list() invoked via kthread, which is also
+	 * updating the if_list */
+	if_lock(t);
+
+	if (pkt_dev->pg_thread) {
+		pr_err("ERROR: already assigned to a thread\n");
+		rv = -EBUSY;
+		goto out;
+	}
+
+	pkt_dev->running = 0;
+	pkt_dev->pg_thread = t;
+	list_add_rcu(&pkt_dev->list, &t->if_list);
+
+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(t->net, 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(array_size(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->burst = 1;
+	pkt_dev->node = NUMA_NO_NODE;
+
+	err = pktgen_setup_dev(t->net, 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, t->net->proc_dir,
+					  &pktgen_if_proc_ops, 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;
+
+	/* xfrm tunnel mode needs additional dst to extract outter
+	 * ip header protocol/ttl/id field, here creat a phony one.
+	 * instead of looking for a valid rt, which definitely hurting
+	 * performance under such circumstance.
+	 */
+	pkt_dev->dstops.family = AF_INET;
+	pkt_dev->xdst.u.dst.dev = pkt_dev->odev;
+	dst_init_metrics(&pkt_dev->xdst.u.dst, pktgen_dst_metrics, false);
+	pkt_dev->xdst.child = &pkt_dev->xdst.u.dst;
+	pkt_dev->xdst.u.dst.ops = &pkt_dev->dstops;
+#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 __net_init pktgen_create_thread(int cpu, struct pktgen_net *pn)
+{
+	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;
+	}
+
+	mutex_init(&t->if_lock);
+	t->cpu = cpu;
+
+	INIT_LIST_HEAD(&t->if_list);
+
+	list_add_tail(&t->th_list, &pn->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("kthread_create_on_node() 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, pn->proc_dir,
+			      &pktgen_thread_proc_ops, 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;
+	}
+
+	t->net = pn;
+	get_task_struct(p);
+	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;
+
+	if_lock(t);
+	list_for_each_safe(q, n, &t->if_list) {
+		p = list_entry(q, struct pktgen_dev, list);
+		if (p == pkt_dev)
+			list_del_rcu(&p->list);
+	}
+	if_unlock(t);
+}
+
+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_warn("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;
+	}
+
+	/* Remove proc before if_list entry, because add_device uses
+	 * list to determine if interface already exist, avoid race
+	 * with proc_create_data() */
+	proc_remove(pkt_dev->entry);
+
+	/* And update the thread if_list */
+	_rem_dev_from_if_list(t, pkt_dev);
+
+#ifdef CONFIG_XFRM
+	free_SAs(pkt_dev);
+#endif
+	vfree(pkt_dev->flows);
+	if (pkt_dev->page)
+		put_page(pkt_dev->page);
+	kfree_rcu(pkt_dev, rcu);
+	return 0;
+}
+
+static int __net_init pg_net_init(struct net *net)
+{
+	struct pktgen_net *pn = net_generic(net, pg_net_id);
+	struct proc_dir_entry *pe;
+	int cpu, ret = 0;
+
+	pn->net = net;
+	INIT_LIST_HEAD(&pn->pktgen_threads);
+	pn->pktgen_exiting = false;
+	pn->proc_dir = proc_mkdir(PG_PROC_DIR, pn->net->proc_net);
+	if (!pn->proc_dir) {
+		pr_warn("cannot create /proc/net/%s\n", PG_PROC_DIR);
+		return -ENODEV;
+	}
+	pe = proc_create(PGCTRL, 0600, pn->proc_dir, &pktgen_proc_ops);
+	if (pe == NULL) {
+		pr_err("cannot create %s procfs entry\n", PGCTRL);
+		ret = -EINVAL;
+		goto remove;
+	}
+
+	for_each_online_cpu(cpu) {
+		int err;
+
+		err = pktgen_create_thread(cpu, pn);
+		if (err)
+			pr_warn("Cannot create thread for cpu %d (%d)\n",
+				   cpu, err);
+	}
+
+	if (list_empty(&pn->pktgen_threads)) {
+		pr_err("Initialization failed for all threads\n");
+		ret = -ENODEV;
+		goto remove_entry;
+	}
+
+	return 0;
+
+remove_entry:
+	remove_proc_entry(PGCTRL, pn->proc_dir);
+remove:
+	remove_proc_entry(PG_PROC_DIR, pn->net->proc_net);
+	return ret;
+}
+
+static void __net_exit pg_net_exit(struct net *net)
+{
+	struct pktgen_net *pn = net_generic(net, pg_net_id);
+	struct pktgen_thread *t;
+	struct list_head *q, *n;
+	LIST_HEAD(list);
+
+	/* Stop all interfaces & threads */
+	pn->pktgen_exiting = true;
+
+	mutex_lock(&pktgen_thread_lock);
+	list_splice_init(&pn->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);
+		put_task_struct(t->tsk);
+		kfree(t);
+	}
+
+	remove_proc_entry(PGCTRL, pn->proc_dir);
+	remove_proc_entry(PG_PROC_DIR, pn->net->proc_net);
+}
+
+static struct pernet_operations pg_net_ops = {
+	.init = pg_net_init,
+	.exit = pg_net_exit,
+	.id   = &pg_net_id,
+	.size = sizeof(struct pktgen_net),
+};
+
+static int __init pg_init(void)
+{
+	int ret = 0;
+
+	pr_info("%s", version);
+	ret = register_pernet_subsys(&pg_net_ops);
+	if (ret)
+		return ret;
+	ret = register_netdevice_notifier(&pktgen_notifier_block);
+	if (ret)
+		unregister_pernet_subsys(&pg_net_ops);
+
+	return ret;
+}
+
+static void __exit pg_cleanup(void)
+{
+	unregister_netdevice_notifier(&pktgen_notifier_block);
+	unregister_pernet_subsys(&pg_net_ops);
+	/* Don't need rcu_barrier() due to use of kfree_rcu() */
+}
+
+module_init(pg_init);
+module_exit(pg_cleanup);
+
+MODULE_AUTHOR("Robert Olsson <robert.olsson@its.uu.se>");
+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");