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TOMOYO Linux Cross Reference
Linux/net/core/pktgen.c

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  1 /*
  2  * Authors:
  3  * Copyright 2001, 2002 by Robert Olsson <robert.olsson@its.uu.se>
  4  *                             Uppsala University and
  5  *                             Swedish University of Agricultural Sciences
  6  *
  7  * Alexey Kuznetsov  <kuznet@ms2.inr.ac.ru>
  8  * Ben Greear <greearb@candelatech.com>
  9  * Jens Låås <jens.laas@data.slu.se>
 10  *
 11  * This program is free software; you can redistribute it and/or
 12  * modify it under the terms of the GNU General Public License
 13  * as published by the Free Software Foundation; either version
 14  * 2 of the License, or (at your option) any later version.
 15  *
 16  *
 17  * A tool for loading the network with preconfigurated packets.
 18  * The tool is implemented as a linux module.  Parameters are output
 19  * device, delay (to hard_xmit), number of packets, and whether
 20  * to use multiple SKBs or just the same one.
 21  * pktgen uses the installed interface's output routine.
 22  *
 23  * Additional hacking by:
 24  *
 25  * Jens.Laas@data.slu.se
 26  * Improved by ANK. 010120.
 27  * Improved by ANK even more. 010212.
 28  * MAC address typo fixed. 010417 --ro
 29  * Integrated.  020301 --DaveM
 30  * Added multiskb option 020301 --DaveM
 31  * Scaling of results. 020417--sigurdur@linpro.no
 32  * Significant re-work of the module:
 33  *   *  Convert to threaded model to more efficiently be able to transmit
 34  *       and receive on multiple interfaces at once.
 35  *   *  Converted many counters to __u64 to allow longer runs.
 36  *   *  Allow configuration of ranges, like min/max IP address, MACs,
 37  *       and UDP-ports, for both source and destination, and can
 38  *       set to use a random distribution or sequentially walk the range.
 39  *   *  Can now change most values after starting.
 40  *   *  Place 12-byte packet in UDP payload with magic number,
 41  *       sequence number, and timestamp.
 42  *   *  Add receiver code that detects dropped pkts, re-ordered pkts, and
 43  *       latencies (with micro-second) precision.
 44  *   *  Add IOCTL interface to easily get counters & configuration.
 45  *   --Ben Greear <greearb@candelatech.com>
 46  *
 47  * Renamed multiskb to clone_skb and cleaned up sending core for two distinct
 48  * skb modes. A clone_skb=0 mode for Ben "ranges" work and a clone_skb != 0
 49  * as a "fastpath" with a configurable number of clones after alloc's.
 50  * clone_skb=0 means all packets are allocated this also means ranges time
 51  * stamps etc can be used. clone_skb=100 means 1 malloc is followed by 100
 52  * clones.
 53  *
 54  * Also moved to /proc/net/pktgen/
 55  * --ro
 56  *
 57  * Sept 10:  Fixed threading/locking.  Lots of bone-headed and more clever
 58  *    mistakes.  Also merged in DaveM's patch in the -pre6 patch.
 59  * --Ben Greear <greearb@candelatech.com>
 60  *
 61  * Integrated to 2.5.x 021029 --Lucio Maciel (luciomaciel@zipmail.com.br)
 62  *
 63  *
 64  * 021124 Finished major redesign and rewrite for new functionality.
 65  * See Documentation/networking/pktgen.txt for how to use this.
 66  *
 67  * The new operation:
 68  * For each CPU one thread/process is created at start. This process checks
 69  * for running devices in the if_list and sends packets until count is 0 it
 70  * also the thread checks the thread->control which is used for inter-process
 71  * communication. controlling process "posts" operations to the threads this
 72  * way. The if_lock should be possible to remove when add/rem_device is merged
 73  * into this too.
 74  *
 75  * By design there should only be *one* "controlling" process. In practice
 76  * multiple write accesses gives unpredictable result. Understood by "write"
 77  * to /proc gives result code thats should be read be the "writer".
 78  * For practical use this should be no problem.
 79  *
 80  * Note when adding devices to a specific CPU there good idea to also assign
 81  * /proc/irq/XX/smp_affinity so TX-interrupts gets bound to the same CPU.
 82  * --ro
 83  *
 84  * Fix refcount off by one if first packet fails, potential null deref,
 85  * memleak 030710- KJP
 86  *
 87  * First "ranges" functionality for ipv6 030726 --ro
 88  *
 89  * Included flow support. 030802 ANK.
 90  *
 91  * Fixed unaligned access on IA-64 Grant Grundler <grundler@parisc-linux.org>
 92  *
 93  * Remove if fix from added Harald Welte <laforge@netfilter.org> 040419
 94  * ia64 compilation fix from  Aron Griffis <aron@hp.com> 040604
 95  *
 96  * New xmit() return, do_div and misc clean up by Stephen Hemminger
 97  * <shemminger@osdl.org> 040923
 98  *
 99  * Randy Dunlap fixed u64 printk compiler waring
100  *
101  * Remove FCS from BW calculation.  Lennert Buytenhek <buytenh@wantstofly.org>
102  * New time handling. Lennert Buytenhek <buytenh@wantstofly.org> 041213
103  *
104  * Corrections from Nikolai Malykh (nmalykh@bilim.com)
105  * Removed unused flags F_SET_SRCMAC & F_SET_SRCIP 041230
106  *
107  * interruptible_sleep_on_timeout() replaced Nishanth Aravamudan <nacc@us.ibm.com>
108  * 050103
109  *
110  * MPLS support by Steven Whitehouse <steve@chygwyn.com>
111  *
112  * 802.1Q/Q-in-Q support by Francesco Fondelli (FF) <francesco.fondelli@gmail.com>
113  *
114  * Fixed src_mac command to set source mac of packet to value specified in
115  * command by Adit Ranadive <adit.262@gmail.com>
116  *
117  */
118 
119 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
120 
121 #include <linux/sys.h>
122 #include <linux/types.h>
123 #include <linux/module.h>
124 #include <linux/moduleparam.h>
125 #include <linux/kernel.h>
126 #include <linux/mutex.h>
127 #include <linux/sched.h>
128 #include <linux/slab.h>
129 #include <linux/vmalloc.h>
130 #include <linux/unistd.h>
131 #include <linux/string.h>
132 #include <linux/ptrace.h>
133 #include <linux/errno.h>
134 #include <linux/ioport.h>
135 #include <linux/interrupt.h>
136 #include <linux/capability.h>
137 #include <linux/hrtimer.h>
138 #include <linux/freezer.h>
139 #include <linux/delay.h>
140 #include <linux/timer.h>
141 #include <linux/list.h>
142 #include <linux/init.h>
143 #include <linux/skbuff.h>
144 #include <linux/netdevice.h>
145 #include <linux/inet.h>
146 #include <linux/inetdevice.h>
147 #include <linux/rtnetlink.h>
148 #include <linux/if_arp.h>
149 #include <linux/if_vlan.h>
150 #include <linux/in.h>
151 #include <linux/ip.h>
152 #include <linux/ipv6.h>
153 #include <linux/udp.h>
154 #include <linux/proc_fs.h>
155 #include <linux/seq_file.h>
156 #include <linux/wait.h>
157 #include <linux/etherdevice.h>
158 #include <linux/kthread.h>
159 #include <linux/prefetch.h>
160 #include <net/net_namespace.h>
161 #include <net/checksum.h>
162 #include <net/ipv6.h>
163 #include <net/udp.h>
164 #include <net/ip6_checksum.h>
165 #include <net/addrconf.h>
166 #ifdef CONFIG_XFRM
167 #include <net/xfrm.h>
168 #endif
169 #include <net/netns/generic.h>
170 #include <asm/byteorder.h>
171 #include <linux/rcupdate.h>
172 #include <linux/bitops.h>
173 #include <linux/io.h>
174 #include <linux/timex.h>
175 #include <linux/uaccess.h>
176 #include <asm/dma.h>
177 #include <asm/div64.h>          /* do_div */
178 
179 #define VERSION "2.74"
180 #define IP_NAME_SZ 32
181 #define MAX_MPLS_LABELS 16 /* This is the max label stack depth */
182 #define MPLS_STACK_BOTTOM htonl(0x00000100)
183 
184 #define func_enter() pr_debug("entering %s\n", __func__);
185 
186 /* Device flag bits */
187 #define F_IPSRC_RND   (1<<0)    /* IP-Src Random  */
188 #define F_IPDST_RND   (1<<1)    /* IP-Dst Random  */
189 #define F_UDPSRC_RND  (1<<2)    /* UDP-Src Random */
190 #define F_UDPDST_RND  (1<<3)    /* UDP-Dst Random */
191 #define F_MACSRC_RND  (1<<4)    /* MAC-Src Random */
192 #define F_MACDST_RND  (1<<5)    /* MAC-Dst Random */
193 #define F_TXSIZE_RND  (1<<6)    /* Transmit size is random */
194 #define F_IPV6        (1<<7)    /* Interface in IPV6 Mode */
195 #define F_MPLS_RND    (1<<8)    /* Random MPLS labels */
196 #define F_VID_RND     (1<<9)    /* Random VLAN ID */
197 #define F_SVID_RND    (1<<10)   /* Random SVLAN ID */
198 #define F_FLOW_SEQ    (1<<11)   /* Sequential flows */
199 #define F_IPSEC_ON    (1<<12)   /* ipsec on for flows */
200 #define F_QUEUE_MAP_RND (1<<13) /* queue map Random */
201 #define F_QUEUE_MAP_CPU (1<<14) /* queue map mirrors smp_processor_id() */
202 #define F_NODE          (1<<15) /* Node memory alloc*/
203 #define F_UDPCSUM       (1<<16) /* Include UDP checksum */
204 
205 /* Thread control flag bits */
206 #define T_STOP        (1<<0)    /* Stop run */
207 #define T_RUN         (1<<1)    /* Start run */
208 #define T_REMDEVALL   (1<<2)    /* Remove all devs */
209 #define T_REMDEV      (1<<3)    /* Remove one dev */
210 
211 /* If lock -- can be removed after some work */
212 #define   if_lock(t)           spin_lock(&(t->if_lock));
213 #define   if_unlock(t)           spin_unlock(&(t->if_lock));
214 
215 /* Used to help with determining the pkts on receive */
216 #define PKTGEN_MAGIC 0xbe9be955
217 #define PG_PROC_DIR "pktgen"
218 #define PGCTRL      "pgctrl"
219 
220 #define MAX_CFLOWS  65536
221 
222 #define VLAN_TAG_SIZE(x) ((x)->vlan_id == 0xffff ? 0 : 4)
223 #define SVLAN_TAG_SIZE(x) ((x)->svlan_id == 0xffff ? 0 : 4)
224 
225 struct flow_state {
226         __be32 cur_daddr;
227         int count;
228 #ifdef CONFIG_XFRM
229         struct xfrm_state *x;
230 #endif
231         __u32 flags;
232 };
233 
234 /* flow flag bits */
235 #define F_INIT   (1<<0)         /* flow has been initialized */
236 
237 struct pktgen_dev {
238         /*
239          * Try to keep frequent/infrequent used vars. separated.
240          */
241         struct proc_dir_entry *entry;   /* proc file */
242         struct pktgen_thread *pg_thread;/* the owner */
243         struct list_head list;          /* chaining in the thread's run-queue */
244 
245         int running;            /* if false, the test will stop */
246 
247         /* If min != max, then we will either do a linear iteration, or
248          * we will do a random selection from within the range.
249          */
250         __u32 flags;
251         int removal_mark;       /* non-zero => the device is marked for
252                                  * removal by worker thread */
253 
254         int min_pkt_size;
255         int max_pkt_size;
256         int pkt_overhead;       /* overhead for MPLS, VLANs, IPSEC etc */
257         int nfrags;
258         struct page *page;
259         u64 delay;              /* nano-seconds */
260 
261         __u64 count;            /* Default No packets to send */
262         __u64 sofar;            /* How many pkts we've sent so far */
263         __u64 tx_bytes;         /* How many bytes we've transmitted */
264         __u64 errors;           /* Errors when trying to transmit, */
265 
266         /* runtime counters relating to clone_skb */
267 
268         __u64 allocated_skbs;
269         __u32 clone_count;
270         int last_ok;            /* Was last skb sent?
271                                  * Or a failed transmit of some sort?
272                                  * This will keep sequence numbers in order
273                                  */
274         ktime_t next_tx;
275         ktime_t started_at;
276         ktime_t stopped_at;
277         u64     idle_acc;       /* nano-seconds */
278 
279         __u32 seq_num;
280 
281         int clone_skb;          /*
282                                  * Use multiple SKBs during packet gen.
283                                  * If this number is greater than 1, then
284                                  * that many copies of the same packet will be
285                                  * sent before a new packet is allocated.
286                                  * If you want to send 1024 identical packets
287                                  * before creating a new packet,
288                                  * set clone_skb to 1024.
289                                  */
290 
291         char dst_min[IP_NAME_SZ];       /* IP, ie 1.2.3.4 */
292         char dst_max[IP_NAME_SZ];       /* IP, ie 1.2.3.4 */
293         char src_min[IP_NAME_SZ];       /* IP, ie 1.2.3.4 */
294         char src_max[IP_NAME_SZ];       /* IP, ie 1.2.3.4 */
295 
296         struct in6_addr in6_saddr;
297         struct in6_addr in6_daddr;
298         struct in6_addr cur_in6_daddr;
299         struct in6_addr cur_in6_saddr;
300         /* For ranges */
301         struct in6_addr min_in6_daddr;
302         struct in6_addr max_in6_daddr;
303         struct in6_addr min_in6_saddr;
304         struct in6_addr max_in6_saddr;
305 
306         /* If we're doing ranges, random or incremental, then this
307          * defines the min/max for those ranges.
308          */
309         __be32 saddr_min;       /* inclusive, source IP address */
310         __be32 saddr_max;       /* exclusive, source IP address */
311         __be32 daddr_min;       /* inclusive, dest IP address */
312         __be32 daddr_max;       /* exclusive, dest IP address */
313 
314         __u16 udp_src_min;      /* inclusive, source UDP port */
315         __u16 udp_src_max;      /* exclusive, source UDP port */
316         __u16 udp_dst_min;      /* inclusive, dest UDP port */
317         __u16 udp_dst_max;      /* exclusive, dest UDP port */
318 
319         /* DSCP + ECN */
320         __u8 tos;            /* six MSB of (former) IPv4 TOS
321                                 are for dscp codepoint */
322         __u8 traffic_class;  /* ditto for the (former) Traffic Class in IPv6
323                                 (see RFC 3260, sec. 4) */
324 
325         /* MPLS */
326         unsigned int nr_labels; /* Depth of stack, 0 = no MPLS */
327         __be32 labels[MAX_MPLS_LABELS];
328 
329         /* VLAN/SVLAN (802.1Q/Q-in-Q) */
330         __u8  vlan_p;
331         __u8  vlan_cfi;
332         __u16 vlan_id;  /* 0xffff means no vlan tag */
333 
334         __u8  svlan_p;
335         __u8  svlan_cfi;
336         __u16 svlan_id; /* 0xffff means no svlan tag */
337 
338         __u32 src_mac_count;    /* How many MACs to iterate through */
339         __u32 dst_mac_count;    /* How many MACs to iterate through */
340 
341         unsigned char dst_mac[ETH_ALEN];
342         unsigned char src_mac[ETH_ALEN];
343 
344         __u32 cur_dst_mac_offset;
345         __u32 cur_src_mac_offset;
346         __be32 cur_saddr;
347         __be32 cur_daddr;
348         __u16 ip_id;
349         __u16 cur_udp_dst;
350         __u16 cur_udp_src;
351         __u16 cur_queue_map;
352         __u32 cur_pkt_size;
353         __u32 last_pkt_size;
354 
355         __u8 hh[14];
356         /* = {
357            0x00, 0x80, 0xC8, 0x79, 0xB3, 0xCB,
358 
359            We fill in SRC address later
360            0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
361            0x08, 0x00
362            };
363          */
364         __u16 pad;              /* pad out the hh struct to an even 16 bytes */
365 
366         struct sk_buff *skb;    /* skb we are to transmit next, used for when we
367                                  * are transmitting the same one multiple times
368                                  */
369         struct net_device *odev; /* The out-going device.
370                                   * Note that the device should have it's
371                                   * pg_info pointer pointing back to this
372                                   * device.
373                                   * Set when the user specifies the out-going
374                                   * device name (not when the inject is
375                                   * started as it used to do.)
376                                   */
377         char odevname[32];
378         struct flow_state *flows;
379         unsigned int cflows;    /* Concurrent flows (config) */
380         unsigned int lflow;             /* Flow length  (config) */
381         unsigned int nflows;    /* accumulated flows (stats) */
382         unsigned int curfl;             /* current sequenced flow (state)*/
383 
384         u16 queue_map_min;
385         u16 queue_map_max;
386         __u32 skb_priority;     /* skb priority field */
387         int node;               /* Memory node */
388 
389 #ifdef CONFIG_XFRM
390         __u8    ipsmode;                /* IPSEC mode (config) */
391         __u8    ipsproto;               /* IPSEC type (config) */
392 #endif
393         char result[512];
394 };
395 
396 struct pktgen_hdr {
397         __be32 pgh_magic;
398         __be32 seq_num;
399         __be32 tv_sec;
400         __be32 tv_usec;
401 };
402 
403 
404 static int pg_net_id __read_mostly;
405 
406 struct pktgen_net {
407         struct net              *net;
408         struct proc_dir_entry   *proc_dir;
409         struct list_head        pktgen_threads;
410         bool                    pktgen_exiting;
411 };
412 
413 struct pktgen_thread {
414         spinlock_t if_lock;             /* for list of devices */
415         struct list_head if_list;       /* All device here */
416         struct list_head th_list;
417         struct task_struct *tsk;
418         char result[512];
419 
420         /* Field for thread to receive "posted" events terminate,
421            stop ifs etc. */
422 
423         u32 control;
424         int cpu;
425 
426         wait_queue_head_t queue;
427         struct completion start_done;
428         struct pktgen_net *net;
429 };
430 
431 #define REMOVE 1
432 #define FIND   0
433 
434 static const char version[] =
435         "Packet Generator for packet performance testing. "
436         "Version: " VERSION "\n";
437 
438 static int pktgen_remove_device(struct pktgen_thread *t, struct pktgen_dev *i);
439 static int pktgen_add_device(struct pktgen_thread *t, const char *ifname);
440 static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t,
441                                           const char *ifname, bool exact);
442 static int pktgen_device_event(struct notifier_block *, unsigned long, void *);
443 static void pktgen_run_all_threads(struct pktgen_net *pn);
444 static void pktgen_reset_all_threads(struct pktgen_net *pn);
445 static void pktgen_stop_all_threads_ifs(struct pktgen_net *pn);
446 
447 static void pktgen_stop(struct pktgen_thread *t);
448 static void pktgen_clear_counters(struct pktgen_dev *pkt_dev);
449 
450 /* Module parameters, defaults. */
451 static int pg_count_d __read_mostly = 1000;
452 static int pg_delay_d __read_mostly;
453 static int pg_clone_skb_d  __read_mostly;
454 static int debug  __read_mostly;
455 
456 static DEFINE_MUTEX(pktgen_thread_lock);
457 
458 static struct notifier_block pktgen_notifier_block = {
459         .notifier_call = pktgen_device_event,
460 };
461 
462 /*
463  * /proc handling functions
464  *
465  */
466 
467 static int pgctrl_show(struct seq_file *seq, void *v)
468 {
469         seq_puts(seq, version);
470         return 0;
471 }
472 
473 static ssize_t pgctrl_write(struct file *file, const char __user *buf,
474                             size_t count, loff_t *ppos)
475 {
476         int err = 0;
477         char data[128];
478         struct pktgen_net *pn = net_generic(current->nsproxy->net_ns, pg_net_id);
479 
480         if (!capable(CAP_NET_ADMIN)) {
481                 err = -EPERM;
482                 goto out;
483         }
484 
485         if (count > sizeof(data))
486                 count = sizeof(data);
487 
488         if (copy_from_user(data, buf, count)) {
489                 err = -EFAULT;
490                 goto out;
491         }
492         data[count - 1] = 0;    /* Make string */
493 
494         if (!strcmp(data, "stop"))
495                 pktgen_stop_all_threads_ifs(pn);
496 
497         else if (!strcmp(data, "start"))
498                 pktgen_run_all_threads(pn);
499 
500         else if (!strcmp(data, "reset"))
501                 pktgen_reset_all_threads(pn);
502 
503         else
504                 pr_warning("Unknown command: %s\n", data);
505 
506         err = count;
507 
508 out:
509         return err;
510 }
511 
512 static int pgctrl_open(struct inode *inode, struct file *file)
513 {
514         return single_open(file, pgctrl_show, PDE_DATA(inode));
515 }
516 
517 static const struct file_operations pktgen_fops = {
518         .owner   = THIS_MODULE,
519         .open    = pgctrl_open,
520         .read    = seq_read,
521         .llseek  = seq_lseek,
522         .write   = pgctrl_write,
523         .release = single_release,
524 };
525 
526 static int pktgen_if_show(struct seq_file *seq, void *v)
527 {
528         const struct pktgen_dev *pkt_dev = seq->private;
529         ktime_t stopped;
530         u64 idle;
531 
532         seq_printf(seq,
533                    "Params: count %llu  min_pkt_size: %u  max_pkt_size: %u\n",
534                    (unsigned long long)pkt_dev->count, pkt_dev->min_pkt_size,
535                    pkt_dev->max_pkt_size);
536 
537         seq_printf(seq,
538                    "     frags: %d  delay: %llu  clone_skb: %d  ifname: %s\n",
539                    pkt_dev->nfrags, (unsigned long long) pkt_dev->delay,
540                    pkt_dev->clone_skb, pkt_dev->odevname);
541 
542         seq_printf(seq, "     flows: %u flowlen: %u\n", pkt_dev->cflows,
543                    pkt_dev->lflow);
544 
545         seq_printf(seq,
546                    "     queue_map_min: %u  queue_map_max: %u\n",
547                    pkt_dev->queue_map_min,
548                    pkt_dev->queue_map_max);
549 
550         if (pkt_dev->skb_priority)
551                 seq_printf(seq, "     skb_priority: %u\n",
552                            pkt_dev->skb_priority);
553 
554         if (pkt_dev->flags & F_IPV6) {
555                 seq_printf(seq,
556                            "     saddr: %pI6c  min_saddr: %pI6c  max_saddr: %pI6c\n"
557                            "     daddr: %pI6c  min_daddr: %pI6c  max_daddr: %pI6c\n",
558                            &pkt_dev->in6_saddr,
559                            &pkt_dev->min_in6_saddr, &pkt_dev->max_in6_saddr,
560                            &pkt_dev->in6_daddr,
561                            &pkt_dev->min_in6_daddr, &pkt_dev->max_in6_daddr);
562         } else {
563                 seq_printf(seq,
564                            "     dst_min: %s  dst_max: %s\n",
565                            pkt_dev->dst_min, pkt_dev->dst_max);
566                 seq_printf(seq,
567                            "        src_min: %s  src_max: %s\n",
568                            pkt_dev->src_min, pkt_dev->src_max);
569         }
570 
571         seq_puts(seq, "     src_mac: ");
572 
573         seq_printf(seq, "%pM ",
574                    is_zero_ether_addr(pkt_dev->src_mac) ?
575                              pkt_dev->odev->dev_addr : pkt_dev->src_mac);
576 
577         seq_printf(seq, "dst_mac: ");
578         seq_printf(seq, "%pM\n", pkt_dev->dst_mac);
579 
580         seq_printf(seq,
581                    "     udp_src_min: %d  udp_src_max: %d"
582                    "  udp_dst_min: %d  udp_dst_max: %d\n",
583                    pkt_dev->udp_src_min, pkt_dev->udp_src_max,
584                    pkt_dev->udp_dst_min, pkt_dev->udp_dst_max);
585 
586         seq_printf(seq,
587                    "     src_mac_count: %d  dst_mac_count: %d\n",
588                    pkt_dev->src_mac_count, pkt_dev->dst_mac_count);
589 
590         if (pkt_dev->nr_labels) {
591                 unsigned int i;
592                 seq_printf(seq, "     mpls: ");
593                 for (i = 0; i < pkt_dev->nr_labels; i++)
594                         seq_printf(seq, "%08x%s", ntohl(pkt_dev->labels[i]),
595                                    i == pkt_dev->nr_labels-1 ? "\n" : ", ");
596         }
597 
598         if (pkt_dev->vlan_id != 0xffff)
599                 seq_printf(seq, "     vlan_id: %u  vlan_p: %u  vlan_cfi: %u\n",
600                            pkt_dev->vlan_id, pkt_dev->vlan_p,
601                            pkt_dev->vlan_cfi);
602 
603         if (pkt_dev->svlan_id != 0xffff)
604                 seq_printf(seq, "     svlan_id: %u  vlan_p: %u  vlan_cfi: %u\n",
605                            pkt_dev->svlan_id, pkt_dev->svlan_p,
606                            pkt_dev->svlan_cfi);
607 
608         if (pkt_dev->tos)
609                 seq_printf(seq, "     tos: 0x%02x\n", pkt_dev->tos);
610 
611         if (pkt_dev->traffic_class)
612                 seq_printf(seq, "     traffic_class: 0x%02x\n", pkt_dev->traffic_class);
613 
614         if (pkt_dev->node >= 0)
615                 seq_printf(seq, "     node: %d\n", pkt_dev->node);
616 
617         seq_printf(seq, "     Flags: ");
618 
619         if (pkt_dev->flags & F_IPV6)
620                 seq_printf(seq, "IPV6  ");
621 
622         if (pkt_dev->flags & F_IPSRC_RND)
623                 seq_printf(seq, "IPSRC_RND  ");
624 
625         if (pkt_dev->flags & F_IPDST_RND)
626                 seq_printf(seq, "IPDST_RND  ");
627 
628         if (pkt_dev->flags & F_TXSIZE_RND)
629                 seq_printf(seq, "TXSIZE_RND  ");
630 
631         if (pkt_dev->flags & F_UDPSRC_RND)
632                 seq_printf(seq, "UDPSRC_RND  ");
633 
634         if (pkt_dev->flags & F_UDPDST_RND)
635                 seq_printf(seq, "UDPDST_RND  ");
636 
637         if (pkt_dev->flags & F_UDPCSUM)
638                 seq_printf(seq, "UDPCSUM  ");
639 
640         if (pkt_dev->flags & F_MPLS_RND)
641                 seq_printf(seq,  "MPLS_RND  ");
642 
643         if (pkt_dev->flags & F_QUEUE_MAP_RND)
644                 seq_printf(seq,  "QUEUE_MAP_RND  ");
645 
646         if (pkt_dev->flags & F_QUEUE_MAP_CPU)
647                 seq_printf(seq,  "QUEUE_MAP_CPU  ");
648 
649         if (pkt_dev->cflows) {
650                 if (pkt_dev->flags & F_FLOW_SEQ)
651                         seq_printf(seq,  "FLOW_SEQ  "); /*in sequence flows*/
652                 else
653                         seq_printf(seq,  "FLOW_RND  ");
654         }
655 
656 #ifdef CONFIG_XFRM
657         if (pkt_dev->flags & F_IPSEC_ON)
658                 seq_printf(seq,  "IPSEC  ");
659 #endif
660 
661         if (pkt_dev->flags & F_MACSRC_RND)
662                 seq_printf(seq, "MACSRC_RND  ");
663 
664         if (pkt_dev->flags & F_MACDST_RND)
665                 seq_printf(seq, "MACDST_RND  ");
666 
667         if (pkt_dev->flags & F_VID_RND)
668                 seq_printf(seq, "VID_RND  ");
669 
670         if (pkt_dev->flags & F_SVID_RND)
671                 seq_printf(seq, "SVID_RND  ");
672 
673         if (pkt_dev->flags & F_NODE)
674                 seq_printf(seq, "NODE_ALLOC  ");
675 
676         seq_puts(seq, "\n");
677 
678         /* not really stopped, more like last-running-at */
679         stopped = pkt_dev->running ? ktime_get() : pkt_dev->stopped_at;
680         idle = pkt_dev->idle_acc;
681         do_div(idle, NSEC_PER_USEC);
682 
683         seq_printf(seq,
684                    "Current:\n     pkts-sofar: %llu  errors: %llu\n",
685                    (unsigned long long)pkt_dev->sofar,
686                    (unsigned long long)pkt_dev->errors);
687 
688         seq_printf(seq,
689                    "     started: %lluus  stopped: %lluus idle: %lluus\n",
690                    (unsigned long long) ktime_to_us(pkt_dev->started_at),
691                    (unsigned long long) ktime_to_us(stopped),
692                    (unsigned long long) idle);
693 
694         seq_printf(seq,
695                    "     seq_num: %d  cur_dst_mac_offset: %d  cur_src_mac_offset: %d\n",
696                    pkt_dev->seq_num, pkt_dev->cur_dst_mac_offset,
697                    pkt_dev->cur_src_mac_offset);
698 
699         if (pkt_dev->flags & F_IPV6) {
700                 seq_printf(seq, "     cur_saddr: %pI6c  cur_daddr: %pI6c\n",
701                                 &pkt_dev->cur_in6_saddr,
702                                 &pkt_dev->cur_in6_daddr);
703         } else
704                 seq_printf(seq, "     cur_saddr: %pI4  cur_daddr: %pI4\n",
705                            &pkt_dev->cur_saddr, &pkt_dev->cur_daddr);
706 
707         seq_printf(seq, "     cur_udp_dst: %d  cur_udp_src: %d\n",
708                    pkt_dev->cur_udp_dst, pkt_dev->cur_udp_src);
709 
710         seq_printf(seq, "     cur_queue_map: %u\n", pkt_dev->cur_queue_map);
711 
712         seq_printf(seq, "     flows: %u\n", pkt_dev->nflows);
713 
714         if (pkt_dev->result[0])
715                 seq_printf(seq, "Result: %s\n", pkt_dev->result);
716         else
717                 seq_printf(seq, "Result: Idle\n");
718 
719         return 0;
720 }
721 
722 
723 static int hex32_arg(const char __user *user_buffer, unsigned long maxlen,
724                      __u32 *num)
725 {
726         int i = 0;
727         *num = 0;
728 
729         for (; i < maxlen; i++) {
730                 int value;
731                 char c;
732                 *num <<= 4;
733                 if (get_user(c, &user_buffer[i]))
734                         return -EFAULT;
735                 value = hex_to_bin(c);
736                 if (value >= 0)
737                         *num |= value;
738                 else
739                         break;
740         }
741         return i;
742 }
743 
744 static int count_trail_chars(const char __user * user_buffer,
745                              unsigned int maxlen)
746 {
747         int i;
748 
749         for (i = 0; i < maxlen; i++) {
750                 char c;
751                 if (get_user(c, &user_buffer[i]))
752                         return -EFAULT;
753                 switch (c) {
754                 case '\"':
755                 case '\n':
756                 case '\r':
757                 case '\t':
758                 case ' ':
759                 case '=':
760                         break;
761                 default:
762                         goto done;
763                 }
764         }
765 done:
766         return i;
767 }
768 
769 static long num_arg(const char __user *user_buffer, unsigned long maxlen,
770                                 unsigned long *num)
771 {
772         int i;
773         *num = 0;
774 
775         for (i = 0; i < maxlen; i++) {
776                 char c;
777                 if (get_user(c, &user_buffer[i]))
778                         return -EFAULT;
779                 if ((c >= '') && (c <= '9')) {
780                         *num *= 10;
781                         *num += c - '';
782                 } else
783                         break;
784         }
785         return i;
786 }
787 
788 static int strn_len(const char __user * user_buffer, unsigned int maxlen)
789 {
790         int i;
791 
792         for (i = 0; i < maxlen; i++) {
793                 char c;
794                 if (get_user(c, &user_buffer[i]))
795                         return -EFAULT;
796                 switch (c) {
797                 case '\"':
798                 case '\n':
799                 case '\r':
800                 case '\t':
801                 case ' ':
802                         goto done_str;
803                         break;
804                 default:
805                         break;
806                 }
807         }
808 done_str:
809         return i;
810 }
811 
812 static ssize_t get_labels(const char __user *buffer, struct pktgen_dev *pkt_dev)
813 {
814         unsigned int n = 0;
815         char c;
816         ssize_t i = 0;
817         int len;
818 
819         pkt_dev->nr_labels = 0;
820         do {
821                 __u32 tmp;
822                 len = hex32_arg(&buffer[i], 8, &tmp);
823                 if (len <= 0)
824                         return len;
825                 pkt_dev->labels[n] = htonl(tmp);
826                 if (pkt_dev->labels[n] & MPLS_STACK_BOTTOM)
827                         pkt_dev->flags |= F_MPLS_RND;
828                 i += len;
829                 if (get_user(c, &buffer[i]))
830                         return -EFAULT;
831                 i++;
832                 n++;
833                 if (n >= MAX_MPLS_LABELS)
834                         return -E2BIG;
835         } while (c == ',');
836 
837         pkt_dev->nr_labels = n;
838         return i;
839 }
840 
841 static ssize_t pktgen_if_write(struct file *file,
842                                const char __user * user_buffer, size_t count,
843                                loff_t * offset)
844 {
845         struct seq_file *seq = file->private_data;
846         struct pktgen_dev *pkt_dev = seq->private;
847         int i, max, len;
848         char name[16], valstr[32];
849         unsigned long value = 0;
850         char *pg_result = NULL;
851         int tmp = 0;
852         char buf[128];
853 
854         pg_result = &(pkt_dev->result[0]);
855 
856         if (count < 1) {
857                 pr_warning("wrong command format\n");
858                 return -EINVAL;
859         }
860 
861         max = count;
862         tmp = count_trail_chars(user_buffer, max);
863         if (tmp < 0) {
864                 pr_warning("illegal format\n");
865                 return tmp;
866         }
867         i = tmp;
868 
869         /* Read variable name */
870 
871         len = strn_len(&user_buffer[i], sizeof(name) - 1);
872         if (len < 0)
873                 return len;
874 
875         memset(name, 0, sizeof(name));
876         if (copy_from_user(name, &user_buffer[i], len))
877                 return -EFAULT;
878         i += len;
879 
880         max = count - i;
881         len = count_trail_chars(&user_buffer[i], max);
882         if (len < 0)
883                 return len;
884 
885         i += len;
886 
887         if (debug) {
888                 size_t copy = min_t(size_t, count, 1023);
889                 char tb[copy + 1];
890                 if (copy_from_user(tb, user_buffer, copy))
891                         return -EFAULT;
892                 tb[copy] = 0;
893                 pr_debug("%s,%lu  buffer -:%s:-\n",
894                          name, (unsigned long)count, tb);
895         }
896 
897         if (!strcmp(name, "min_pkt_size")) {
898                 len = num_arg(&user_buffer[i], 10, &value);
899                 if (len < 0)
900                         return len;
901 
902                 i += len;
903                 if (value < 14 + 20 + 8)
904                         value = 14 + 20 + 8;
905                 if (value != pkt_dev->min_pkt_size) {
906                         pkt_dev->min_pkt_size = value;
907                         pkt_dev->cur_pkt_size = value;
908                 }
909                 sprintf(pg_result, "OK: min_pkt_size=%u",
910                         pkt_dev->min_pkt_size);
911                 return count;
912         }
913 
914         if (!strcmp(name, "max_pkt_size")) {
915                 len = num_arg(&user_buffer[i], 10, &value);
916                 if (len < 0)
917                         return len;
918 
919                 i += len;
920                 if (value < 14 + 20 + 8)
921                         value = 14 + 20 + 8;
922                 if (value != pkt_dev->max_pkt_size) {
923                         pkt_dev->max_pkt_size = value;
924                         pkt_dev->cur_pkt_size = value;
925                 }
926                 sprintf(pg_result, "OK: max_pkt_size=%u",
927                         pkt_dev->max_pkt_size);
928                 return count;
929         }
930 
931         /* Shortcut for min = max */
932 
933         if (!strcmp(name, "pkt_size")) {
934                 len = num_arg(&user_buffer[i], 10, &value);
935                 if (len < 0)
936                         return len;
937 
938                 i += len;
939                 if (value < 14 + 20 + 8)
940                         value = 14 + 20 + 8;
941                 if (value != pkt_dev->min_pkt_size) {
942                         pkt_dev->min_pkt_size = value;
943                         pkt_dev->max_pkt_size = value;
944                         pkt_dev->cur_pkt_size = value;
945                 }
946                 sprintf(pg_result, "OK: pkt_size=%u", pkt_dev->min_pkt_size);
947                 return count;
948         }
949 
950         if (!strcmp(name, "debug")) {
951                 len = num_arg(&user_buffer[i], 10, &value);
952                 if (len < 0)
953                         return len;
954 
955                 i += len;
956                 debug = value;
957                 sprintf(pg_result, "OK: debug=%u", debug);
958                 return count;
959         }
960 
961         if (!strcmp(name, "frags")) {
962                 len = num_arg(&user_buffer[i], 10, &value);
963                 if (len < 0)
964                         return len;
965 
966                 i += len;
967                 pkt_dev->nfrags = value;
968                 sprintf(pg_result, "OK: frags=%u", pkt_dev->nfrags);
969                 return count;
970         }
971         if (!strcmp(name, "delay")) {
972                 len = num_arg(&user_buffer[i], 10, &value);
973                 if (len < 0)
974                         return len;
975 
976                 i += len;
977                 if (value == 0x7FFFFFFF)
978                         pkt_dev->delay = ULLONG_MAX;
979                 else
980                         pkt_dev->delay = (u64)value;
981 
982                 sprintf(pg_result, "OK: delay=%llu",
983                         (unsigned long long) pkt_dev->delay);
984                 return count;
985         }
986         if (!strcmp(name, "rate")) {
987                 len = num_arg(&user_buffer[i], 10, &value);
988                 if (len < 0)
989                         return len;
990 
991                 i += len;
992                 if (!value)
993                         return len;
994                 pkt_dev->delay = pkt_dev->min_pkt_size*8*NSEC_PER_USEC/value;
995                 if (debug)
996                         pr_info("Delay set at: %llu ns\n", pkt_dev->delay);
997 
998                 sprintf(pg_result, "OK: rate=%lu", value);
999                 return count;
1000         }
1001         if (!strcmp(name, "ratep")) {
1002                 len = num_arg(&user_buffer[i], 10, &value);
1003                 if (len < 0)
1004                         return len;
1005 
1006                 i += len;
1007                 if (!value)
1008                         return len;
1009                 pkt_dev->delay = NSEC_PER_SEC/value;
1010                 if (debug)
1011                         pr_info("Delay set at: %llu ns\n", pkt_dev->delay);
1012 
1013                 sprintf(pg_result, "OK: rate=%lu", value);
1014                 return count;
1015         }
1016         if (!strcmp(name, "udp_src_min")) {
1017                 len = num_arg(&user_buffer[i], 10, &value);
1018                 if (len < 0)
1019                         return len;
1020 
1021                 i += len;
1022                 if (value != pkt_dev->udp_src_min) {
1023                         pkt_dev->udp_src_min = value;
1024                         pkt_dev->cur_udp_src = value;
1025                 }
1026                 sprintf(pg_result, "OK: udp_src_min=%u", pkt_dev->udp_src_min);
1027                 return count;
1028         }
1029         if (!strcmp(name, "udp_dst_min")) {
1030                 len = num_arg(&user_buffer[i], 10, &value);
1031                 if (len < 0)
1032                         return len;
1033 
1034                 i += len;
1035                 if (value != pkt_dev->udp_dst_min) {
1036                         pkt_dev->udp_dst_min = value;
1037                         pkt_dev->cur_udp_dst = value;
1038                 }
1039                 sprintf(pg_result, "OK: udp_dst_min=%u", pkt_dev->udp_dst_min);
1040                 return count;
1041         }
1042         if (!strcmp(name, "udp_src_max")) {
1043                 len = num_arg(&user_buffer[i], 10, &value);
1044                 if (len < 0)
1045                         return len;
1046 
1047                 i += len;
1048                 if (value != pkt_dev->udp_src_max) {
1049                         pkt_dev->udp_src_max = value;
1050                         pkt_dev->cur_udp_src = value;
1051                 }
1052                 sprintf(pg_result, "OK: udp_src_max=%u", pkt_dev->udp_src_max);
1053                 return count;
1054         }
1055         if (!strcmp(name, "udp_dst_max")) {
1056                 len = num_arg(&user_buffer[i], 10, &value);
1057                 if (len < 0)
1058                         return len;
1059 
1060                 i += len;
1061                 if (value != pkt_dev->udp_dst_max) {
1062                         pkt_dev->udp_dst_max = value;
1063                         pkt_dev->cur_udp_dst = value;
1064                 }
1065                 sprintf(pg_result, "OK: udp_dst_max=%u", pkt_dev->udp_dst_max);
1066                 return count;
1067         }
1068         if (!strcmp(name, "clone_skb")) {
1069                 len = num_arg(&user_buffer[i], 10, &value);
1070                 if (len < 0)
1071                         return len;
1072                 if ((value > 0) &&
1073                     (!(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)))
1074                         return -ENOTSUPP;
1075                 i += len;
1076                 pkt_dev->clone_skb = value;
1077 
1078                 sprintf(pg_result, "OK: clone_skb=%d", pkt_dev->clone_skb);
1079                 return count;
1080         }
1081         if (!strcmp(name, "count")) {
1082                 len = num_arg(&user_buffer[i], 10, &value);
1083                 if (len < 0)
1084                         return len;
1085 
1086                 i += len;
1087                 pkt_dev->count = value;
1088                 sprintf(pg_result, "OK: count=%llu",
1089                         (unsigned long long)pkt_dev->count);
1090                 return count;
1091         }
1092         if (!strcmp(name, "src_mac_count")) {
1093                 len = num_arg(&user_buffer[i], 10, &value);
1094                 if (len < 0)
1095                         return len;
1096 
1097                 i += len;
1098                 if (pkt_dev->src_mac_count != value) {
1099                         pkt_dev->src_mac_count = value;
1100                         pkt_dev->cur_src_mac_offset = 0;
1101                 }
1102                 sprintf(pg_result, "OK: src_mac_count=%d",
1103                         pkt_dev->src_mac_count);
1104                 return count;
1105         }
1106         if (!strcmp(name, "dst_mac_count")) {
1107                 len = num_arg(&user_buffer[i], 10, &value);
1108                 if (len < 0)
1109                         return len;
1110 
1111                 i += len;
1112                 if (pkt_dev->dst_mac_count != value) {
1113                         pkt_dev->dst_mac_count = value;
1114                         pkt_dev->cur_dst_mac_offset = 0;
1115                 }
1116                 sprintf(pg_result, "OK: dst_mac_count=%d",
1117                         pkt_dev->dst_mac_count);
1118                 return count;
1119         }
1120         if (!strcmp(name, "node")) {
1121                 len = num_arg(&user_buffer[i], 10, &value);
1122                 if (len < 0)
1123                         return len;
1124 
1125                 i += len;
1126 
1127                 if (node_possible(value)) {
1128                         pkt_dev->node = value;
1129                         sprintf(pg_result, "OK: node=%d", pkt_dev->node);
1130                         if (pkt_dev->page) {
1131                                 put_page(pkt_dev->page);
1132                                 pkt_dev->page = NULL;
1133                         }
1134                 }
1135                 else
1136                         sprintf(pg_result, "ERROR: node not possible");
1137                 return count;
1138         }
1139         if (!strcmp(name, "flag")) {
1140                 char f[32];
1141                 memset(f, 0, 32);
1142                 len = strn_len(&user_buffer[i], sizeof(f) - 1);
1143                 if (len < 0)
1144                         return len;
1145 
1146                 if (copy_from_user(f, &user_buffer[i], len))
1147                         return -EFAULT;
1148                 i += len;
1149                 if (strcmp(f, "IPSRC_RND") == 0)
1150                         pkt_dev->flags |= F_IPSRC_RND;
1151 
1152                 else if (strcmp(f, "!IPSRC_RND") == 0)
1153                         pkt_dev->flags &= ~F_IPSRC_RND;
1154 
1155                 else if (strcmp(f, "TXSIZE_RND") == 0)
1156                         pkt_dev->flags |= F_TXSIZE_RND;
1157 
1158                 else if (strcmp(f, "!TXSIZE_RND") == 0)
1159                         pkt_dev->flags &= ~F_TXSIZE_RND;
1160 
1161                 else if (strcmp(f, "IPDST_RND") == 0)
1162                         pkt_dev->flags |= F_IPDST_RND;
1163 
1164                 else if (strcmp(f, "!IPDST_RND") == 0)
1165                         pkt_dev->flags &= ~F_IPDST_RND;
1166 
1167                 else if (strcmp(f, "UDPSRC_RND") == 0)
1168                         pkt_dev->flags |= F_UDPSRC_RND;
1169 
1170                 else if (strcmp(f, "!UDPSRC_RND") == 0)
1171                         pkt_dev->flags &= ~F_UDPSRC_RND;
1172 
1173                 else if (strcmp(f, "UDPDST_RND") == 0)
1174                         pkt_dev->flags |= F_UDPDST_RND;
1175 
1176                 else if (strcmp(f, "!UDPDST_RND") == 0)
1177                         pkt_dev->flags &= ~F_UDPDST_RND;
1178 
1179                 else if (strcmp(f, "MACSRC_RND") == 0)
1180                         pkt_dev->flags |= F_MACSRC_RND;
1181 
1182                 else if (strcmp(f, "!MACSRC_RND") == 0)
1183                         pkt_dev->flags &= ~F_MACSRC_RND;
1184 
1185                 else if (strcmp(f, "MACDST_RND") == 0)
1186                         pkt_dev->flags |= F_MACDST_RND;
1187 
1188                 else if (strcmp(f, "!MACDST_RND") == 0)
1189                         pkt_dev->flags &= ~F_MACDST_RND;
1190 
1191                 else if (strcmp(f, "MPLS_RND") == 0)
1192                         pkt_dev->flags |= F_MPLS_RND;
1193 
1194                 else if (strcmp(f, "!MPLS_RND") == 0)
1195                         pkt_dev->flags &= ~F_MPLS_RND;
1196 
1197                 else if (strcmp(f, "VID_RND") == 0)
1198                         pkt_dev->flags |= F_VID_RND;
1199 
1200                 else if (strcmp(f, "!VID_RND") == 0)
1201                         pkt_dev->flags &= ~F_VID_RND;
1202 
1203                 else if (strcmp(f, "SVID_RND") == 0)
1204                         pkt_dev->flags |= F_SVID_RND;
1205 
1206                 else if (strcmp(f, "!SVID_RND") == 0)
1207                         pkt_dev->flags &= ~F_SVID_RND;
1208 
1209                 else if (strcmp(f, "FLOW_SEQ") == 0)
1210                         pkt_dev->flags |= F_FLOW_SEQ;
1211 
1212                 else if (strcmp(f, "QUEUE_MAP_RND") == 0)
1213                         pkt_dev->flags |= F_QUEUE_MAP_RND;
1214 
1215                 else if (strcmp(f, "!QUEUE_MAP_RND") == 0)
1216                         pkt_dev->flags &= ~F_QUEUE_MAP_RND;
1217 
1218                 else if (strcmp(f, "QUEUE_MAP_CPU") == 0)
1219                         pkt_dev->flags |= F_QUEUE_MAP_CPU;
1220 
1221                 else if (strcmp(f, "!QUEUE_MAP_CPU") == 0)
1222                         pkt_dev->flags &= ~F_QUEUE_MAP_CPU;
1223 #ifdef CONFIG_XFRM
1224                 else if (strcmp(f, "IPSEC") == 0)
1225                         pkt_dev->flags |= F_IPSEC_ON;
1226 #endif
1227 
1228                 else if (strcmp(f, "!IPV6") == 0)
1229                         pkt_dev->flags &= ~F_IPV6;
1230 
1231                 else if (strcmp(f, "NODE_ALLOC") == 0)
1232                         pkt_dev->flags |= F_NODE;
1233 
1234                 else if (strcmp(f, "!NODE_ALLOC") == 0)
1235                         pkt_dev->flags &= ~F_NODE;
1236 
1237                 else if (strcmp(f, "UDPCSUM") == 0)
1238                         pkt_dev->flags |= F_UDPCSUM;
1239 
1240                 else if (strcmp(f, "!UDPCSUM") == 0)
1241                         pkt_dev->flags &= ~F_UDPCSUM;
1242 
1243                 else {
1244                         sprintf(pg_result,
1245                                 "Flag -:%s:- unknown\nAvailable flags, (prepend ! to un-set flag):\n%s",
1246                                 f,
1247                                 "IPSRC_RND, IPDST_RND, UDPSRC_RND, UDPDST_RND, "
1248                                 "MACSRC_RND, MACDST_RND, TXSIZE_RND, IPV6, MPLS_RND, VID_RND, SVID_RND, FLOW_SEQ, IPSEC, NODE_ALLOC\n");
1249                         return count;
1250                 }
1251                 sprintf(pg_result, "OK: flags=0x%x", pkt_dev->flags);
1252                 return count;
1253         }
1254         if (!strcmp(name, "dst_min") || !strcmp(name, "dst")) {
1255                 len = strn_len(&user_buffer[i], sizeof(pkt_dev->dst_min) - 1);
1256                 if (len < 0)
1257                         return len;
1258 
1259                 if (copy_from_user(buf, &user_buffer[i], len))
1260                         return -EFAULT;
1261                 buf[len] = 0;
1262                 if (strcmp(buf, pkt_dev->dst_min) != 0) {
1263                         memset(pkt_dev->dst_min, 0, sizeof(pkt_dev->dst_min));
1264                         strncpy(pkt_dev->dst_min, buf, len);
1265                         pkt_dev->daddr_min = in_aton(pkt_dev->dst_min);
1266                         pkt_dev->cur_daddr = pkt_dev->daddr_min;
1267                 }
1268                 if (debug)
1269                         pr_debug("dst_min set to: %s\n", pkt_dev->dst_min);
1270                 i += len;
1271                 sprintf(pg_result, "OK: dst_min=%s", pkt_dev->dst_min);
1272                 return count;
1273         }
1274         if (!strcmp(name, "dst_max")) {
1275                 len = strn_len(&user_buffer[i], sizeof(pkt_dev->dst_max) - 1);
1276                 if (len < 0)
1277                         return len;
1278 
1279 
1280                 if (copy_from_user(buf, &user_buffer[i], len))
1281                         return -EFAULT;
1282 
1283                 buf[len] = 0;
1284                 if (strcmp(buf, pkt_dev->dst_max) != 0) {
1285                         memset(pkt_dev->dst_max, 0, sizeof(pkt_dev->dst_max));
1286                         strncpy(pkt_dev->dst_max, buf, len);
1287                         pkt_dev->daddr_max = in_aton(pkt_dev->dst_max);
1288                         pkt_dev->cur_daddr = pkt_dev->daddr_max;
1289                 }
1290                 if (debug)
1291                         pr_debug("dst_max set to: %s\n", pkt_dev->dst_max);
1292                 i += len;
1293                 sprintf(pg_result, "OK: dst_max=%s", pkt_dev->dst_max);
1294                 return count;
1295         }
1296         if (!strcmp(name, "dst6")) {
1297                 len = strn_len(&user_buffer[i], sizeof(buf) - 1);
1298                 if (len < 0)
1299                         return len;
1300 
1301                 pkt_dev->flags |= F_IPV6;
1302 
1303                 if (copy_from_user(buf, &user_buffer[i], len))
1304                         return -EFAULT;
1305                 buf[len] = 0;
1306 
1307                 in6_pton(buf, -1, pkt_dev->in6_daddr.s6_addr, -1, NULL);
1308                 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->in6_daddr);
1309 
1310                 pkt_dev->cur_in6_daddr = pkt_dev->in6_daddr;
1311 
1312                 if (debug)
1313                         pr_debug("dst6 set to: %s\n", buf);
1314 
1315                 i += len;
1316                 sprintf(pg_result, "OK: dst6=%s", buf);
1317                 return count;
1318         }
1319         if (!strcmp(name, "dst6_min")) {
1320                 len = strn_len(&user_buffer[i], sizeof(buf) - 1);
1321                 if (len < 0)
1322                         return len;
1323 
1324                 pkt_dev->flags |= F_IPV6;
1325 
1326                 if (copy_from_user(buf, &user_buffer[i], len))
1327                         return -EFAULT;
1328                 buf[len] = 0;
1329 
1330                 in6_pton(buf, -1, pkt_dev->min_in6_daddr.s6_addr, -1, NULL);
1331                 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->min_in6_daddr);
1332 
1333                 pkt_dev->cur_in6_daddr = pkt_dev->min_in6_daddr;
1334                 if (debug)
1335                         pr_debug("dst6_min set to: %s\n", buf);
1336 
1337                 i += len;
1338                 sprintf(pg_result, "OK: dst6_min=%s", buf);
1339                 return count;
1340         }
1341         if (!strcmp(name, "dst6_max")) {
1342                 len = strn_len(&user_buffer[i], sizeof(buf) - 1);
1343                 if (len < 0)
1344                         return len;
1345 
1346                 pkt_dev->flags |= F_IPV6;
1347 
1348                 if (copy_from_user(buf, &user_buffer[i], len))
1349                         return -EFAULT;
1350                 buf[len] = 0;
1351 
1352                 in6_pton(buf, -1, pkt_dev->max_in6_daddr.s6_addr, -1, NULL);
1353                 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->max_in6_daddr);
1354 
1355                 if (debug)
1356                         pr_debug("dst6_max set to: %s\n", buf);
1357 
1358                 i += len;
1359                 sprintf(pg_result, "OK: dst6_max=%s", buf);
1360                 return count;
1361         }
1362         if (!strcmp(name, "src6")) {
1363                 len = strn_len(&user_buffer[i], sizeof(buf) - 1);
1364                 if (len < 0)
1365                         return len;
1366 
1367                 pkt_dev->flags |= F_IPV6;
1368 
1369                 if (copy_from_user(buf, &user_buffer[i], len))
1370                         return -EFAULT;
1371                 buf[len] = 0;
1372 
1373                 in6_pton(buf, -1, pkt_dev->in6_saddr.s6_addr, -1, NULL);
1374                 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->in6_saddr);
1375 
1376                 pkt_dev->cur_in6_saddr = pkt_dev->in6_saddr;
1377 
1378                 if (debug)
1379                         pr_debug("src6 set to: %s\n", buf);
1380 
1381                 i += len;
1382                 sprintf(pg_result, "OK: src6=%s", buf);
1383                 return count;
1384         }
1385         if (!strcmp(name, "src_min")) {
1386                 len = strn_len(&user_buffer[i], sizeof(pkt_dev->src_min) - 1);
1387                 if (len < 0)
1388                         return len;
1389 
1390                 if (copy_from_user(buf, &user_buffer[i], len))
1391                         return -EFAULT;
1392                 buf[len] = 0;
1393                 if (strcmp(buf, pkt_dev->src_min) != 0) {
1394                         memset(pkt_dev->src_min, 0, sizeof(pkt_dev->src_min));
1395                         strncpy(pkt_dev->src_min, buf, len);
1396                         pkt_dev->saddr_min = in_aton(pkt_dev->src_min);
1397                         pkt_dev->cur_saddr = pkt_dev->saddr_min;
1398                 }
1399                 if (debug)
1400                         pr_debug("src_min set to: %s\n", pkt_dev->src_min);
1401                 i += len;
1402                 sprintf(pg_result, "OK: src_min=%s", pkt_dev->src_min);
1403                 return count;
1404         }
1405         if (!strcmp(name, "src_max")) {
1406                 len = strn_len(&user_buffer[i], sizeof(pkt_dev->src_max) - 1);
1407                 if (len < 0)
1408                         return len;
1409 
1410                 if (copy_from_user(buf, &user_buffer[i], len))
1411                         return -EFAULT;
1412                 buf[len] = 0;
1413                 if (strcmp(buf, pkt_dev->src_max) != 0) {
1414                         memset(pkt_dev->src_max, 0, sizeof(pkt_dev->src_max));
1415                         strncpy(pkt_dev->src_max, buf, len);
1416                         pkt_dev->saddr_max = in_aton(pkt_dev->src_max);
1417                         pkt_dev->cur_saddr = pkt_dev->saddr_max;
1418                 }
1419                 if (debug)
1420                         pr_debug("src_max set to: %s\n", pkt_dev->src_max);
1421                 i += len;
1422                 sprintf(pg_result, "OK: src_max=%s", pkt_dev->src_max);
1423                 return count;
1424         }
1425         if (!strcmp(name, "dst_mac")) {
1426                 len = strn_len(&user_buffer[i], sizeof(valstr) - 1);
1427                 if (len < 0)
1428                         return len;
1429 
1430                 memset(valstr, 0, sizeof(valstr));
1431                 if (copy_from_user(valstr, &user_buffer[i], len))
1432                         return -EFAULT;
1433 
1434                 if (!mac_pton(valstr, pkt_dev->dst_mac))
1435                         return -EINVAL;
1436                 /* Set up Dest MAC */
1437                 memcpy(&pkt_dev->hh[0], pkt_dev->dst_mac, ETH_ALEN);
1438 
1439                 sprintf(pg_result, "OK: dstmac %pM", pkt_dev->dst_mac);
1440                 return count;
1441         }
1442         if (!strcmp(name, "src_mac")) {
1443                 len = strn_len(&user_buffer[i], sizeof(valstr) - 1);
1444                 if (len < 0)
1445                         return len;
1446 
1447                 memset(valstr, 0, sizeof(valstr));
1448                 if (copy_from_user(valstr, &user_buffer[i], len))
1449                         return -EFAULT;
1450 
1451                 if (!mac_pton(valstr, pkt_dev->src_mac))
1452                         return -EINVAL;
1453                 /* Set up Src MAC */
1454                 memcpy(&pkt_dev->hh[6], pkt_dev->src_mac, ETH_ALEN);
1455 
1456                 sprintf(pg_result, "OK: srcmac %pM", pkt_dev->src_mac);
1457                 return count;
1458         }
1459 
1460         if (!strcmp(name, "clear_counters")) {
1461                 pktgen_clear_counters(pkt_dev);
1462                 sprintf(pg_result, "OK: Clearing counters.\n");
1463                 return count;
1464         }
1465 
1466         if (!strcmp(name, "flows")) {
1467                 len = num_arg(&user_buffer[i], 10, &value);
1468                 if (len < 0)
1469                         return len;
1470 
1471                 i += len;
1472                 if (value > MAX_CFLOWS)
1473                         value = MAX_CFLOWS;
1474 
1475                 pkt_dev->cflows = value;
1476                 sprintf(pg_result, "OK: flows=%u", pkt_dev->cflows);
1477                 return count;
1478         }
1479 
1480         if (!strcmp(name, "flowlen")) {
1481                 len = num_arg(&user_buffer[i], 10, &value);
1482                 if (len < 0)
1483                         return len;
1484 
1485                 i += len;
1486                 pkt_dev->lflow = value;
1487                 sprintf(pg_result, "OK: flowlen=%u", pkt_dev->lflow);
1488                 return count;
1489         }
1490 
1491         if (!strcmp(name, "queue_map_min")) {
1492                 len = num_arg(&user_buffer[i], 5, &value);
1493                 if (len < 0)
1494                         return len;
1495 
1496                 i += len;
1497                 pkt_dev->queue_map_min = value;
1498                 sprintf(pg_result, "OK: queue_map_min=%u", pkt_dev->queue_map_min);
1499                 return count;
1500         }
1501 
1502         if (!strcmp(name, "queue_map_max")) {
1503                 len = num_arg(&user_buffer[i], 5, &value);
1504                 if (len < 0)
1505                         return len;
1506 
1507                 i += len;
1508                 pkt_dev->queue_map_max = value;
1509                 sprintf(pg_result, "OK: queue_map_max=%u", pkt_dev->queue_map_max);
1510                 return count;
1511         }
1512 
1513         if (!strcmp(name, "mpls")) {
1514                 unsigned int n, cnt;
1515 
1516                 len = get_labels(&user_buffer[i], pkt_dev);
1517                 if (len < 0)
1518                         return len;
1519                 i += len;
1520                 cnt = sprintf(pg_result, "OK: mpls=");
1521                 for (n = 0; n < pkt_dev->nr_labels; n++)
1522                         cnt += sprintf(pg_result + cnt,
1523                                        "%08x%s", ntohl(pkt_dev->labels[n]),
1524                                        n == pkt_dev->nr_labels-1 ? "" : ",");
1525 
1526                 if (pkt_dev->nr_labels && pkt_dev->vlan_id != 0xffff) {
1527                         pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */
1528                         pkt_dev->svlan_id = 0xffff;
1529 
1530                         if (debug)
1531                                 pr_debug("VLAN/SVLAN auto turned off\n");
1532                 }
1533                 return count;
1534         }
1535 
1536         if (!strcmp(name, "vlan_id")) {
1537                 len = num_arg(&user_buffer[i], 4, &value);
1538                 if (len < 0)
1539                         return len;
1540 
1541                 i += len;
1542                 if (value <= 4095) {
1543                         pkt_dev->vlan_id = value;  /* turn on VLAN */
1544 
1545                         if (debug)
1546                                 pr_debug("VLAN turned on\n");
1547 
1548                         if (debug && pkt_dev->nr_labels)
1549                                 pr_debug("MPLS auto turned off\n");
1550 
1551                         pkt_dev->nr_labels = 0;    /* turn off MPLS */
1552                         sprintf(pg_result, "OK: vlan_id=%u", pkt_dev->vlan_id);
1553                 } else {
1554                         pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */
1555                         pkt_dev->svlan_id = 0xffff;
1556 
1557                         if (debug)
1558                                 pr_debug("VLAN/SVLAN turned off\n");
1559                 }
1560                 return count;
1561         }
1562 
1563         if (!strcmp(name, "vlan_p")) {
1564                 len = num_arg(&user_buffer[i], 1, &value);
1565                 if (len < 0)
1566                         return len;
1567 
1568                 i += len;
1569                 if ((value <= 7) && (pkt_dev->vlan_id != 0xffff)) {
1570                         pkt_dev->vlan_p = value;
1571                         sprintf(pg_result, "OK: vlan_p=%u", pkt_dev->vlan_p);
1572                 } else {
1573                         sprintf(pg_result, "ERROR: vlan_p must be 0-7");
1574                 }
1575                 return count;
1576         }
1577 
1578         if (!strcmp(name, "vlan_cfi")) {
1579                 len = num_arg(&user_buffer[i], 1, &value);
1580                 if (len < 0)
1581                         return len;
1582 
1583                 i += len;
1584                 if ((value <= 1) && (pkt_dev->vlan_id != 0xffff)) {
1585                         pkt_dev->vlan_cfi = value;
1586                         sprintf(pg_result, "OK: vlan_cfi=%u", pkt_dev->vlan_cfi);
1587                 } else {
1588                         sprintf(pg_result, "ERROR: vlan_cfi must be 0-1");
1589                 }
1590                 return count;
1591         }
1592 
1593         if (!strcmp(name, "svlan_id")) {
1594                 len = num_arg(&user_buffer[i], 4, &value);
1595                 if (len < 0)
1596                         return len;
1597 
1598                 i += len;
1599                 if ((value <= 4095) && ((pkt_dev->vlan_id != 0xffff))) {
1600                         pkt_dev->svlan_id = value;  /* turn on SVLAN */
1601 
1602                         if (debug)
1603                                 pr_debug("SVLAN turned on\n");
1604 
1605                         if (debug && pkt_dev->nr_labels)
1606                                 pr_debug("MPLS auto turned off\n");
1607 
1608                         pkt_dev->nr_labels = 0;    /* turn off MPLS */
1609                         sprintf(pg_result, "OK: svlan_id=%u", pkt_dev->svlan_id);
1610                 } else {
1611                         pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */
1612                         pkt_dev->svlan_id = 0xffff;
1613 
1614                         if (debug)
1615                                 pr_debug("VLAN/SVLAN turned off\n");
1616                 }
1617                 return count;
1618         }
1619 
1620         if (!strcmp(name, "svlan_p")) {
1621                 len = num_arg(&user_buffer[i], 1, &value);
1622                 if (len < 0)
1623                         return len;
1624 
1625                 i += len;
1626                 if ((value <= 7) && (pkt_dev->svlan_id != 0xffff)) {
1627                         pkt_dev->svlan_p = value;
1628                         sprintf(pg_result, "OK: svlan_p=%u", pkt_dev->svlan_p);
1629                 } else {
1630                         sprintf(pg_result, "ERROR: svlan_p must be 0-7");
1631                 }
1632                 return count;
1633         }
1634 
1635         if (!strcmp(name, "svlan_cfi")) {
1636                 len = num_arg(&user_buffer[i], 1, &value);
1637                 if (len < 0)
1638                         return len;
1639 
1640                 i += len;
1641                 if ((value <= 1) && (pkt_dev->svlan_id != 0xffff)) {
1642                         pkt_dev->svlan_cfi = value;
1643                         sprintf(pg_result, "OK: svlan_cfi=%u", pkt_dev->svlan_cfi);
1644                 } else {
1645                         sprintf(pg_result, "ERROR: svlan_cfi must be 0-1");
1646                 }
1647                 return count;
1648         }
1649 
1650         if (!strcmp(name, "tos")) {
1651                 __u32 tmp_value = 0;
1652                 len = hex32_arg(&user_buffer[i], 2, &tmp_value);
1653                 if (len < 0)
1654                         return len;
1655 
1656                 i += len;
1657                 if (len == 2) {
1658                         pkt_dev->tos = tmp_value;
1659                         sprintf(pg_result, "OK: tos=0x%02x", pkt_dev->tos);
1660                 } else {
1661                         sprintf(pg_result, "ERROR: tos must be 00-ff");
1662                 }
1663                 return count;
1664         }
1665 
1666         if (!strcmp(name, "traffic_class")) {
1667                 __u32 tmp_value = 0;
1668                 len = hex32_arg(&user_buffer[i], 2, &tmp_value);
1669                 if (len < 0)
1670                         return len;
1671 
1672                 i += len;
1673                 if (len == 2) {
1674                         pkt_dev->traffic_class = tmp_value;
1675                         sprintf(pg_result, "OK: traffic_class=0x%02x", pkt_dev->traffic_class);
1676                 } else {
1677                         sprintf(pg_result, "ERROR: traffic_class must be 00-ff");
1678                 }
1679                 return count;
1680         }
1681 
1682         if (!strcmp(name, "skb_priority")) {
1683                 len = num_arg(&user_buffer[i], 9, &value);
1684                 if (len < 0)
1685                         return len;
1686 
1687                 i += len;
1688                 pkt_dev->skb_priority = value;
1689                 sprintf(pg_result, "OK: skb_priority=%i",
1690                         pkt_dev->skb_priority);
1691                 return count;
1692         }
1693 
1694         sprintf(pkt_dev->result, "No such parameter \"%s\"", name);
1695         return -EINVAL;
1696 }
1697 
1698 static int pktgen_if_open(struct inode *inode, struct file *file)
1699 {
1700         return single_open(file, pktgen_if_show, PDE_DATA(inode));
1701 }
1702 
1703 static const struct file_operations pktgen_if_fops = {
1704         .owner   = THIS_MODULE,
1705         .open    = pktgen_if_open,
1706         .read    = seq_read,
1707         .llseek  = seq_lseek,
1708         .write   = pktgen_if_write,
1709         .release = single_release,
1710 };
1711 
1712 static int pktgen_thread_show(struct seq_file *seq, void *v)
1713 {
1714         struct pktgen_thread *t = seq->private;
1715         const struct pktgen_dev *pkt_dev;
1716 
1717         BUG_ON(!t);
1718 
1719         seq_printf(seq, "Running: ");
1720 
1721         if_lock(t);
1722         list_for_each_entry(pkt_dev, &t->if_list, list)
1723                 if (pkt_dev->running)
1724                         seq_printf(seq, "%s ", pkt_dev->odevname);
1725 
1726         seq_printf(seq, "\nStopped: ");
1727 
1728         list_for_each_entry(pkt_dev, &t->if_list, list)
1729                 if (!pkt_dev->running)
1730                         seq_printf(seq, "%s ", pkt_dev->odevname);
1731 
1732         if (t->result[0])
1733                 seq_printf(seq, "\nResult: %s\n", t->result);
1734         else
1735                 seq_printf(seq, "\nResult: NA\n");
1736 
1737         if_unlock(t);
1738 
1739         return 0;
1740 }
1741 
1742 static ssize_t pktgen_thread_write(struct file *file,
1743                                    const char __user * user_buffer,
1744                                    size_t count, loff_t * offset)
1745 {
1746         struct seq_file *seq = file->private_data;
1747         struct pktgen_thread *t = seq->private;
1748         int i, max, len, ret;
1749         char name[40];
1750         char *pg_result;
1751 
1752         if (count < 1) {
1753                 //      sprintf(pg_result, "Wrong command format");
1754                 return -EINVAL;
1755         }
1756 
1757         max = count;
1758         len = count_trail_chars(user_buffer, max);
1759         if (len < 0)
1760                 return len;
1761 
1762         i = len;
1763 
1764         /* Read variable name */
1765 
1766         len = strn_len(&user_buffer[i], sizeof(name) - 1);
1767         if (len < 0)
1768                 return len;
1769 
1770         memset(name, 0, sizeof(name));
1771         if (copy_from_user(name, &user_buffer[i], len))
1772                 return -EFAULT;
1773         i += len;
1774 
1775         max = count - i;
1776         len = count_trail_chars(&user_buffer[i], max);
1777         if (len < 0)
1778                 return len;
1779 
1780         i += len;
1781 
1782         if (debug)
1783                 pr_debug("t=%s, count=%lu\n", name, (unsigned long)count);
1784 
1785         if (!t) {
1786                 pr_err("ERROR: No thread\n");
1787                 ret = -EINVAL;
1788                 goto out;
1789         }
1790 
1791         pg_result = &(t->result[0]);
1792 
1793         if (!strcmp(name, "add_device")) {
1794                 char f[32];
1795                 memset(f, 0, 32);
1796                 len = strn_len(&user_buffer[i], sizeof(f) - 1);
1797                 if (len < 0) {
1798                         ret = len;
1799                         goto out;
1800                 }
1801                 if (copy_from_user(f, &user_buffer[i], len))
1802                         return -EFAULT;
1803                 i += len;
1804                 mutex_lock(&pktgen_thread_lock);
1805                 ret = pktgen_add_device(t, f);
1806                 mutex_unlock(&pktgen_thread_lock);
1807                 if (!ret) {
1808                         ret = count;
1809                         sprintf(pg_result, "OK: add_device=%s", f);
1810                 } else
1811                         sprintf(pg_result, "ERROR: can not add device %s", f);
1812                 goto out;
1813         }
1814 
1815         if (!strcmp(name, "rem_device_all")) {
1816                 mutex_lock(&pktgen_thread_lock);
1817                 t->control |= T_REMDEVALL;
1818                 mutex_unlock(&pktgen_thread_lock);
1819                 schedule_timeout_interruptible(msecs_to_jiffies(125));  /* Propagate thread->control  */
1820                 ret = count;
1821                 sprintf(pg_result, "OK: rem_device_all");
1822                 goto out;
1823         }
1824 
1825         if (!strcmp(name, "max_before_softirq")) {
1826                 sprintf(pg_result, "OK: Note! max_before_softirq is obsoleted -- Do not use");
1827                 ret = count;
1828                 goto out;
1829         }
1830 
1831         ret = -EINVAL;
1832 out:
1833         return ret;
1834 }
1835 
1836 static int pktgen_thread_open(struct inode *inode, struct file *file)
1837 {
1838         return single_open(file, pktgen_thread_show, PDE_DATA(inode));
1839 }
1840 
1841 static const struct file_operations pktgen_thread_fops = {
1842         .owner   = THIS_MODULE,
1843         .open    = pktgen_thread_open,
1844         .read    = seq_read,
1845         .llseek  = seq_lseek,
1846         .write   = pktgen_thread_write,
1847         .release = single_release,
1848 };
1849 
1850 /* Think find or remove for NN */
1851 static struct pktgen_dev *__pktgen_NN_threads(const struct pktgen_net *pn,
1852                                               const char *ifname, int remove)
1853 {
1854         struct pktgen_thread *t;
1855         struct pktgen_dev *pkt_dev = NULL;
1856         bool exact = (remove == FIND);
1857 
1858         list_for_each_entry(t, &pn->pktgen_threads, th_list) {
1859                 pkt_dev = pktgen_find_dev(t, ifname, exact);
1860                 if (pkt_dev) {
1861                         if (remove) {
1862                                 if_lock(t);
1863                                 pkt_dev->removal_mark = 1;
1864                                 t->control |= T_REMDEV;
1865                                 if_unlock(t);
1866                         }
1867                         break;
1868                 }
1869         }
1870         return pkt_dev;
1871 }
1872 
1873 /*
1874  * mark a device for removal
1875  */
1876 static void pktgen_mark_device(const struct pktgen_net *pn, const char *ifname)
1877 {
1878         struct pktgen_dev *pkt_dev = NULL;
1879         const int max_tries = 10, msec_per_try = 125;
1880         int i = 0;
1881 
1882         mutex_lock(&pktgen_thread_lock);
1883         pr_debug("%s: marking %s for removal\n", __func__, ifname);
1884 
1885         while (1) {
1886 
1887                 pkt_dev = __pktgen_NN_threads(pn, ifname, REMOVE);
1888                 if (pkt_dev == NULL)
1889                         break;  /* success */
1890 
1891                 mutex_unlock(&pktgen_thread_lock);
1892                 pr_debug("%s: waiting for %s to disappear....\n",
1893                          __func__, ifname);
1894                 schedule_timeout_interruptible(msecs_to_jiffies(msec_per_try));
1895                 mutex_lock(&pktgen_thread_lock);
1896 
1897                 if (++i >= max_tries) {
1898                         pr_err("%s: timed out after waiting %d msec for device %s to be removed\n",
1899                                __func__, msec_per_try * i, ifname);
1900                         break;
1901                 }
1902 
1903         }
1904 
1905         mutex_unlock(&pktgen_thread_lock);
1906 }
1907 
1908 static void pktgen_change_name(const struct pktgen_net *pn, struct net_device *dev)
1909 {
1910         struct pktgen_thread *t;
1911 
1912         list_for_each_entry(t, &pn->pktgen_threads, th_list) {
1913                 struct pktgen_dev *pkt_dev;
1914 
1915                 list_for_each_entry(pkt_dev, &t->if_list, list) {
1916                         if (pkt_dev->odev != dev)
1917                                 continue;
1918 
1919                         proc_remove(pkt_dev->entry);
1920 
1921                         pkt_dev->entry = proc_create_data(dev->name, 0600,
1922                                                           pn->proc_dir,
1923                                                           &pktgen_if_fops,
1924                                                           pkt_dev);
1925                         if (!pkt_dev->entry)
1926                                 pr_err("can't move proc entry for '%s'\n",
1927                                        dev->name);
1928                         break;
1929                 }
1930         }
1931 }
1932 
1933 static int pktgen_device_event(struct notifier_block *unused,
1934                                unsigned long event, void *ptr)
1935 {
1936         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1937         struct pktgen_net *pn = net_generic(dev_net(dev), pg_net_id);
1938 
1939         if (pn->pktgen_exiting)
1940                 return NOTIFY_DONE;
1941 
1942         /* It is OK that we do not hold the group lock right now,
1943          * as we run under the RTNL lock.
1944          */
1945 
1946         switch (event) {
1947         case NETDEV_CHANGENAME:
1948                 pktgen_change_name(pn, dev);
1949                 break;
1950 
1951         case NETDEV_UNREGISTER:
1952                 pktgen_mark_device(pn, dev->name);
1953                 break;
1954         }
1955 
1956         return NOTIFY_DONE;
1957 }
1958 
1959 static struct net_device *pktgen_dev_get_by_name(const struct pktgen_net *pn,
1960                                                  struct pktgen_dev *pkt_dev,
1961                                                  const char *ifname)
1962 {
1963         char b[IFNAMSIZ+5];
1964         int i;
1965 
1966         for (i = 0; ifname[i] != '@'; i++) {
1967                 if (i == IFNAMSIZ)
1968                         break;
1969 
1970                 b[i] = ifname[i];
1971         }
1972         b[i] = 0;
1973 
1974         return dev_get_by_name(pn->net, b);
1975 }
1976 
1977 
1978 /* Associate pktgen_dev with a device. */
1979 
1980 static int pktgen_setup_dev(const struct pktgen_net *pn,
1981                             struct pktgen_dev *pkt_dev, const char *ifname)
1982 {
1983         struct net_device *odev;
1984         int err;
1985 
1986         /* Clean old setups */
1987         if (pkt_dev->odev) {
1988                 dev_put(pkt_dev->odev);
1989                 pkt_dev->odev = NULL;
1990         }
1991 
1992         odev = pktgen_dev_get_by_name(pn, pkt_dev, ifname);
1993         if (!odev) {
1994                 pr_err("no such netdevice: \"%s\"\n", ifname);
1995                 return -ENODEV;
1996         }
1997 
1998         if (odev->type != ARPHRD_ETHER) {
1999                 pr_err("not an ethernet device: \"%s\"\n", ifname);
2000                 err = -EINVAL;
2001         } else if (!netif_running(odev)) {
2002                 pr_err("device is down: \"%s\"\n", ifname);
2003                 err = -ENETDOWN;
2004         } else {
2005                 pkt_dev->odev = odev;
2006                 return 0;
2007         }
2008 
2009         dev_put(odev);
2010         return err;
2011 }
2012 
2013 /* Read pkt_dev from the interface and set up internal pktgen_dev
2014  * structure to have the right information to create/send packets
2015  */
2016 static void pktgen_setup_inject(struct pktgen_dev *pkt_dev)
2017 {
2018         int ntxq;
2019 
2020         if (!pkt_dev->odev) {
2021                 pr_err("ERROR: pkt_dev->odev == NULL in setup_inject\n");
2022                 sprintf(pkt_dev->result,
2023                         "ERROR: pkt_dev->odev == NULL in setup_inject.\n");
2024                 return;
2025         }
2026 
2027         /* make sure that we don't pick a non-existing transmit queue */
2028         ntxq = pkt_dev->odev->real_num_tx_queues;
2029 
2030         if (ntxq <= pkt_dev->queue_map_min) {
2031                 pr_warning("WARNING: Requested queue_map_min (zero-based) (%d) exceeds valid range [0 - %d] for (%d) queues on %s, resetting\n",
2032                            pkt_dev->queue_map_min, (ntxq ?: 1) - 1, ntxq,
2033                            pkt_dev->odevname);
2034                 pkt_dev->queue_map_min = (ntxq ?: 1) - 1;
2035         }
2036         if (pkt_dev->queue_map_max >= ntxq) {
2037                 pr_warning("WARNING: Requested queue_map_max (zero-based) (%d) exceeds valid range [0 - %d] for (%d) queues on %s, resetting\n",
2038                            pkt_dev->queue_map_max, (ntxq ?: 1) - 1, ntxq,
2039                            pkt_dev->odevname);
2040                 pkt_dev->queue_map_max = (ntxq ?: 1) - 1;
2041         }
2042 
2043         /* Default to the interface's mac if not explicitly set. */
2044 
2045         if (is_zero_ether_addr(pkt_dev->src_mac))
2046                 memcpy(&(pkt_dev->hh[6]), pkt_dev->odev->dev_addr, ETH_ALEN);
2047 
2048         /* Set up Dest MAC */
2049         memcpy(&(pkt_dev->hh[0]), pkt_dev->dst_mac, ETH_ALEN);
2050 
2051         if (pkt_dev->flags & F_IPV6) {
2052                 int i, set = 0, err = 1;
2053                 struct inet6_dev *idev;
2054 
2055                 if (pkt_dev->min_pkt_size == 0) {
2056                         pkt_dev->min_pkt_size = 14 + sizeof(struct ipv6hdr)
2057                                                 + sizeof(struct udphdr)
2058                                                 + sizeof(struct pktgen_hdr)
2059                                                 + pkt_dev->pkt_overhead;
2060                 }
2061 
2062                 for (i = 0; i < IN6_ADDR_HSIZE; i++)
2063                         if (pkt_dev->cur_in6_saddr.s6_addr[i]) {
2064                                 set = 1;
2065                                 break;
2066                         }
2067 
2068                 if (!set) {
2069 
2070                         /*
2071                          * Use linklevel address if unconfigured.
2072                          *
2073                          * use ipv6_get_lladdr if/when it's get exported
2074                          */
2075 
2076                         rcu_read_lock();
2077                         idev = __in6_dev_get(pkt_dev->odev);
2078                         if (idev) {
2079                                 struct inet6_ifaddr *ifp;
2080 
2081                                 read_lock_bh(&idev->lock);
2082                                 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2083                                         if ((ifp->scope & IFA_LINK) &&
2084                                             !(ifp->flags & IFA_F_TENTATIVE)) {
2085                                                 pkt_dev->cur_in6_saddr = ifp->addr;
2086                                                 err = 0;
2087                                                 break;
2088                                         }
2089                                 }
2090                                 read_unlock_bh(&idev->lock);
2091                         }
2092                         rcu_read_unlock();
2093                         if (err)
2094                                 pr_err("ERROR: IPv6 link address not available\n");
2095                 }
2096         } else {
2097                 if (pkt_dev->min_pkt_size == 0) {
2098                         pkt_dev->min_pkt_size = 14 + sizeof(struct iphdr)
2099                                                 + sizeof(struct udphdr)
2100                                                 + sizeof(struct pktgen_hdr)
2101                                                 + pkt_dev->pkt_overhead;
2102                 }
2103 
2104                 pkt_dev->saddr_min = 0;
2105                 pkt_dev->saddr_max = 0;
2106                 if (strlen(pkt_dev->src_min) == 0) {
2107 
2108                         struct in_device *in_dev;
2109 
2110                         rcu_read_lock();
2111                         in_dev = __in_dev_get_rcu(pkt_dev->odev);
2112                         if (in_dev) {
2113                                 if (in_dev->ifa_list) {
2114                                         pkt_dev->saddr_min =
2115                                             in_dev->ifa_list->ifa_address;
2116                                         pkt_dev->saddr_max = pkt_dev->saddr_min;
2117                                 }
2118                         }
2119                         rcu_read_unlock();
2120                 } else {
2121                         pkt_dev->saddr_min = in_aton(pkt_dev->src_min);
2122                         pkt_dev->saddr_max = in_aton(pkt_dev->src_max);
2123                 }
2124 
2125                 pkt_dev->daddr_min = in_aton(pkt_dev->dst_min);
2126                 pkt_dev->daddr_max = in_aton(pkt_dev->dst_max);
2127         }
2128         /* Initialize current values. */
2129         pkt_dev->cur_pkt_size = pkt_dev->min_pkt_size;
2130         if (pkt_dev->min_pkt_size > pkt_dev->max_pkt_size)
2131                 pkt_dev->max_pkt_size = pkt_dev->min_pkt_size;
2132 
2133         pkt_dev->cur_dst_mac_offset = 0;
2134         pkt_dev->cur_src_mac_offset = 0;
2135         pkt_dev->cur_saddr = pkt_dev->saddr_min;
2136         pkt_dev->cur_daddr = pkt_dev->daddr_min;
2137         pkt_dev->cur_udp_dst = pkt_dev->udp_dst_min;
2138         pkt_dev->cur_udp_src = pkt_dev->udp_src_min;
2139         pkt_dev->nflows = 0;
2140 }
2141 
2142 
2143 static void spin(struct pktgen_dev *pkt_dev, ktime_t spin_until)
2144 {
2145         ktime_t start_time, end_time;
2146         s64 remaining;
2147         struct hrtimer_sleeper t;
2148 
2149         hrtimer_init_on_stack(&t.timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
2150         hrtimer_set_expires(&t.timer, spin_until);
2151 
2152         remaining = ktime_to_ns(hrtimer_expires_remaining(&t.timer));
2153         if (remaining <= 0) {
2154                 pkt_dev->next_tx = ktime_add_ns(spin_until, pkt_dev->delay);
2155                 return;
2156         }
2157 
2158         start_time = ktime_get();
2159         if (remaining < 100000) {
2160                 /* for small delays (<100us), just loop until limit is reached */
2161                 do {
2162                         end_time = ktime_get();
2163                 } while (ktime_compare(end_time, spin_until) < 0);
2164         } else {
2165                 /* see do_nanosleep */
2166                 hrtimer_init_sleeper(&t, current);
2167                 do {
2168                         set_current_state(TASK_INTERRUPTIBLE);
2169                         hrtimer_start_expires(&t.timer, HRTIMER_MODE_ABS);
2170                         if (!hrtimer_active(&t.timer))
2171                                 t.task = NULL;
2172 
2173                         if (likely(t.task))
2174                                 schedule();
2175 
2176                         hrtimer_cancel(&t.timer);
2177                 } while (t.task && pkt_dev->running && !signal_pending(current));
2178                 __set_current_state(TASK_RUNNING);
2179                 end_time = ktime_get();
2180         }
2181 
2182         pkt_dev->idle_acc += ktime_to_ns(ktime_sub(end_time, start_time));
2183         pkt_dev->next_tx = ktime_add_ns(spin_until, pkt_dev->delay);
2184 }
2185 
2186 static inline void set_pkt_overhead(struct pktgen_dev *pkt_dev)
2187 {
2188         pkt_dev->pkt_overhead = 0;
2189         pkt_dev->pkt_overhead += pkt_dev->nr_labels*sizeof(u32);
2190         pkt_dev->pkt_overhead += VLAN_TAG_SIZE(pkt_dev);
2191         pkt_dev->pkt_overhead += SVLAN_TAG_SIZE(pkt_dev);
2192 }
2193 
2194 static inline int f_seen(const struct pktgen_dev *pkt_dev, int flow)
2195 {
2196         return !!(pkt_dev->flows[flow].flags & F_INIT);
2197 }
2198 
2199 static inline int f_pick(struct pktgen_dev *pkt_dev)
2200 {
2201         int flow = pkt_dev->curfl;
2202 
2203         if (pkt_dev->flags & F_FLOW_SEQ) {
2204                 if (pkt_dev->flows[flow].count >= pkt_dev->lflow) {
2205                         /* reset time */
2206                         pkt_dev->flows[flow].count = 0;
2207                         pkt_dev->flows[flow].flags = 0;
2208                         pkt_dev->curfl += 1;
2209                         if (pkt_dev->curfl >= pkt_dev->cflows)
2210                                 pkt_dev->curfl = 0; /*reset */
2211                 }
2212         } else {
2213                 flow = prandom_u32() % pkt_dev->cflows;
2214                 pkt_dev->curfl = flow;
2215 
2216                 if (pkt_dev->flows[flow].count > pkt_dev->lflow) {
2217                         pkt_dev->flows[flow].count = 0;
2218                         pkt_dev->flows[flow].flags = 0;
2219                 }
2220         }
2221 
2222         return pkt_dev->curfl;
2223 }
2224 
2225 
2226 #ifdef CONFIG_XFRM
2227 /* If there was already an IPSEC SA, we keep it as is, else
2228  * we go look for it ...
2229 */
2230 #define DUMMY_MARK 0
2231 static void get_ipsec_sa(struct pktgen_dev *pkt_dev, int flow)
2232 {
2233         struct xfrm_state *x = pkt_dev->flows[flow].x;
2234         struct pktgen_net *pn = net_generic(dev_net(pkt_dev->odev), pg_net_id);
2235         if (!x) {
2236                 /*slow path: we dont already have xfrm_state*/
2237                 x = xfrm_stateonly_find(pn->net, DUMMY_MARK,
2238                                         (xfrm_address_t *)&pkt_dev->cur_daddr,
2239                                         (xfrm_address_t *)&pkt_dev->cur_saddr,
2240                                         AF_INET,
2241                                         pkt_dev->ipsmode,
2242                                         pkt_dev->ipsproto, 0);
2243                 if (x) {
2244                         pkt_dev->flows[flow].x = x;
2245                         set_pkt_overhead(pkt_dev);
2246                         pkt_dev->pkt_overhead += x->props.header_len;
2247                 }
2248 
2249         }
2250 }
2251 #endif
2252 static void set_cur_queue_map(struct pktgen_dev *pkt_dev)
2253 {
2254 
2255         if (pkt_dev->flags & F_QUEUE_MAP_CPU)
2256                 pkt_dev->cur_queue_map = smp_processor_id();
2257 
2258         else if (pkt_dev->queue_map_min <= pkt_dev->queue_map_max) {
2259                 __u16 t;
2260                 if (pkt_dev->flags & F_QUEUE_MAP_RND) {
2261                         t = prandom_u32() %
2262                                 (pkt_dev->queue_map_max -
2263                                  pkt_dev->queue_map_min + 1)
2264                                 + pkt_dev->queue_map_min;
2265                 } else {
2266                         t = pkt_dev->cur_queue_map + 1;
2267                         if (t > pkt_dev->queue_map_max)
2268                                 t = pkt_dev->queue_map_min;
2269                 }
2270                 pkt_dev->cur_queue_map = t;
2271         }
2272         pkt_dev->cur_queue_map  = pkt_dev->cur_queue_map % pkt_dev->odev->real_num_tx_queues;
2273 }
2274 
2275 /* Increment/randomize headers according to flags and current values
2276  * for IP src/dest, UDP src/dst port, MAC-Addr src/dst
2277  */
2278 static void mod_cur_headers(struct pktgen_dev *pkt_dev)
2279 {
2280         __u32 imn;
2281         __u32 imx;
2282         int flow = 0;
2283 
2284         if (pkt_dev->cflows)
2285                 flow = f_pick(pkt_dev);
2286 
2287         /*  Deal with source MAC */
2288         if (pkt_dev->src_mac_count > 1) {
2289                 __u32 mc;
2290                 __u32 tmp;
2291 
2292                 if (pkt_dev->flags & F_MACSRC_RND)
2293                         mc = prandom_u32() % pkt_dev->src_mac_count;
2294                 else {
2295                         mc = pkt_dev->cur_src_mac_offset++;
2296                         if (pkt_dev->cur_src_mac_offset >=
2297                             pkt_dev->src_mac_count)
2298                                 pkt_dev->cur_src_mac_offset = 0;
2299                 }
2300 
2301                 tmp = pkt_dev->src_mac[5] + (mc & 0xFF);
2302                 pkt_dev->hh[11] = tmp;
2303                 tmp = (pkt_dev->src_mac[4] + ((mc >> 8) & 0xFF) + (tmp >> 8));
2304                 pkt_dev->hh[10] = tmp;
2305                 tmp = (pkt_dev->src_mac[3] + ((mc >> 16) & 0xFF) + (tmp >> 8));
2306                 pkt_dev->hh[9] = tmp;
2307                 tmp = (pkt_dev->src_mac[2] + ((mc >> 24) & 0xFF) + (tmp >> 8));
2308                 pkt_dev->hh[8] = tmp;
2309                 tmp = (pkt_dev->src_mac[1] + (tmp >> 8));
2310                 pkt_dev->hh[7] = tmp;
2311         }
2312 
2313         /*  Deal with Destination MAC */
2314         if (pkt_dev->dst_mac_count > 1) {
2315                 __u32 mc;
2316                 __u32 tmp;
2317 
2318                 if (pkt_dev->flags & F_MACDST_RND)
2319                         mc = prandom_u32() % pkt_dev->dst_mac_count;
2320 
2321                 else {
2322                         mc = pkt_dev->cur_dst_mac_offset++;
2323                         if (pkt_dev->cur_dst_mac_offset >=
2324                             pkt_dev->dst_mac_count) {
2325                                 pkt_dev->cur_dst_mac_offset = 0;
2326                         }
2327                 }
2328 
2329                 tmp = pkt_dev->dst_mac[5] + (mc & 0xFF);
2330                 pkt_dev->hh[5] = tmp;
2331                 tmp = (pkt_dev->dst_mac[4] + ((mc >> 8) & 0xFF) + (tmp >> 8));
2332                 pkt_dev->hh[4] = tmp;
2333                 tmp = (pkt_dev->dst_mac[3] + ((mc >> 16) & 0xFF) + (tmp >> 8));
2334                 pkt_dev->hh[3] = tmp;
2335                 tmp = (pkt_dev->dst_mac[2] + ((mc >> 24) & 0xFF) + (tmp >> 8));
2336                 pkt_dev->hh[2] = tmp;
2337                 tmp = (pkt_dev->dst_mac[1] + (tmp >> 8));
2338                 pkt_dev->hh[1] = tmp;
2339         }
2340 
2341         if (pkt_dev->flags & F_MPLS_RND) {
2342                 unsigned int i;
2343                 for (i = 0; i < pkt_dev->nr_labels; i++)
2344                         if (pkt_dev->labels[i] & MPLS_STACK_BOTTOM)
2345                                 pkt_dev->labels[i] = MPLS_STACK_BOTTOM |
2346                                              ((__force __be32)prandom_u32() &
2347                                                       htonl(0x000fffff));
2348         }
2349 
2350         if ((pkt_dev->flags & F_VID_RND) && (pkt_dev->vlan_id != 0xffff)) {
2351                 pkt_dev->vlan_id = prandom_u32() & (4096 - 1);
2352         }
2353 
2354         if ((pkt_dev->flags & F_SVID_RND) && (pkt_dev->svlan_id != 0xffff)) {
2355                 pkt_dev->svlan_id = prandom_u32() & (4096 - 1);
2356         }
2357 
2358         if (pkt_dev->udp_src_min < pkt_dev->udp_src_max) {
2359                 if (pkt_dev->flags & F_UDPSRC_RND)
2360                         pkt_dev->cur_udp_src = prandom_u32() %
2361                                 (pkt_dev->udp_src_max - pkt_dev->udp_src_min)
2362                                 + pkt_dev->udp_src_min;
2363 
2364                 else {
2365                         pkt_dev->cur_udp_src++;
2366                         if (pkt_dev->cur_udp_src >= pkt_dev->udp_src_max)
2367                                 pkt_dev->cur_udp_src = pkt_dev->udp_src_min;
2368                 }
2369         }
2370 
2371         if (pkt_dev->udp_dst_min < pkt_dev->udp_dst_max) {
2372                 if (pkt_dev->flags & F_UDPDST_RND) {
2373                         pkt_dev->cur_udp_dst = prandom_u32() %
2374                                 (pkt_dev->udp_dst_max - pkt_dev->udp_dst_min)
2375                                 + pkt_dev->udp_dst_min;
2376                 } else {
2377                         pkt_dev->cur_udp_dst++;
2378                         if (pkt_dev->cur_udp_dst >= pkt_dev->udp_dst_max)
2379                                 pkt_dev->cur_udp_dst = pkt_dev->udp_dst_min;
2380                 }
2381         }
2382 
2383         if (!(pkt_dev->flags & F_IPV6)) {
2384 
2385                 imn = ntohl(pkt_dev->saddr_min);
2386                 imx = ntohl(pkt_dev->saddr_max);
2387                 if (imn < imx) {
2388                         __u32 t;
2389                         if (pkt_dev->flags & F_IPSRC_RND)
2390                                 t = prandom_u32() % (imx - imn) + imn;
2391                         else {
2392                                 t = ntohl(pkt_dev->cur_saddr);
2393                                 t++;
2394                                 if (t > imx)
2395                                         t = imn;
2396 
2397                         }
2398                         pkt_dev->cur_saddr = htonl(t);
2399                 }
2400 
2401                 if (pkt_dev->cflows && f_seen(pkt_dev, flow)) {
2402                         pkt_dev->cur_daddr = pkt_dev->flows[flow].cur_daddr;
2403                 } else {
2404                         imn = ntohl(pkt_dev->daddr_min);
2405                         imx = ntohl(pkt_dev->daddr_max);
2406                         if (imn < imx) {
2407                                 __u32 t;
2408                                 __be32 s;
2409                                 if (pkt_dev->flags & F_IPDST_RND) {
2410 
2411                                         do {
2412                                                 t = prandom_u32() %
2413                                                         (imx - imn) + imn;
2414                                                 s = htonl(t);
2415                                         } while (ipv4_is_loopback(s) ||
2416                                                 ipv4_is_multicast(s) ||
2417                                                 ipv4_is_lbcast(s) ||
2418                                                 ipv4_is_zeronet(s) ||
2419                                                 ipv4_is_local_multicast(s));
2420                                         pkt_dev->cur_daddr = s;
2421                                 } else {
2422                                         t = ntohl(pkt_dev->cur_daddr);
2423                                         t++;
2424                                         if (t > imx) {
2425                                                 t = imn;
2426                                         }
2427                                         pkt_dev->cur_daddr = htonl(t);
2428                                 }
2429                         }
2430                         if (pkt_dev->cflows) {
2431                                 pkt_dev->flows[flow].flags |= F_INIT;
2432                                 pkt_dev->flows[flow].cur_daddr =
2433                                     pkt_dev->cur_daddr;
2434 #ifdef CONFIG_XFRM
2435                                 if (pkt_dev->flags & F_IPSEC_ON)
2436                                         get_ipsec_sa(pkt_dev, flow);
2437 #endif
2438                                 pkt_dev->nflows++;
2439                         }
2440                 }
2441         } else {                /* IPV6 * */
2442 
2443                 if (!ipv6_addr_any(&pkt_dev->min_in6_daddr)) {
2444                         int i;
2445 
2446                         /* Only random destinations yet */
2447 
2448                         for (i = 0; i < 4; i++) {
2449                                 pkt_dev->cur_in6_daddr.s6_addr32[i] =
2450                                     (((__force __be32)prandom_u32() |
2451                                       pkt_dev->min_in6_daddr.s6_addr32[i]) &
2452                                      pkt_dev->max_in6_daddr.s6_addr32[i]);
2453                         }
2454                 }
2455         }
2456 
2457         if (pkt_dev->min_pkt_size < pkt_dev->max_pkt_size) {
2458                 __u32 t;
2459                 if (pkt_dev->flags & F_TXSIZE_RND) {
2460                         t = prandom_u32() %
2461                                 (pkt_dev->max_pkt_size - pkt_dev->min_pkt_size)
2462                                 + pkt_dev->min_pkt_size;
2463                 } else {
2464                         t = pkt_dev->cur_pkt_size + 1;
2465                         if (t > pkt_dev->max_pkt_size)
2466                                 t = pkt_dev->min_pkt_size;
2467                 }
2468                 pkt_dev->cur_pkt_size = t;
2469         }
2470 
2471         set_cur_queue_map(pkt_dev);
2472 
2473         pkt_dev->flows[flow].count++;
2474 }
2475 
2476 
2477 #ifdef CONFIG_XFRM
2478 static int pktgen_output_ipsec(struct sk_buff *skb, struct pktgen_dev *pkt_dev)
2479 {
2480         struct xfrm_state *x = pkt_dev->flows[pkt_dev->curfl].x;
2481         int err = 0;
2482 
2483         if (!x)
2484                 return 0;
2485         /* XXX: we dont support tunnel mode for now until
2486          * we resolve the dst issue */
2487         if (x->props.mode != XFRM_MODE_TRANSPORT)
2488                 return 0;
2489 
2490         spin_lock(&x->lock);
2491 
2492         err = x->outer_mode->output(x, skb);
2493         if (err)
2494                 goto error;
2495         err = x->type->output(x, skb);
2496         if (err)
2497                 goto error;
2498 
2499         x->curlft.bytes += skb->len;
2500         x->curlft.packets++;
2501 error:
2502         spin_unlock(&x->lock);
2503         return err;
2504 }
2505 
2506 static void free_SAs(struct pktgen_dev *pkt_dev)
2507 {
2508         if (pkt_dev->cflows) {
2509                 /* let go of the SAs if we have them */
2510                 int i;
2511                 for (i = 0; i < pkt_dev->cflows; i++) {
2512                         struct xfrm_state *x = pkt_dev->flows[i].x;
2513                         if (x) {
2514                                 xfrm_state_put(x);
2515                                 pkt_dev->flows[i].x = NULL;
2516                         }
2517                 }
2518         }
2519 }
2520 
2521 static int process_ipsec(struct pktgen_dev *pkt_dev,
2522                               struct sk_buff *skb, __be16 protocol)
2523 {
2524         if (pkt_dev->flags & F_IPSEC_ON) {
2525                 struct xfrm_state *x = pkt_dev->flows[pkt_dev->curfl].x;
2526                 int nhead = 0;
2527                 if (x) {
2528                         int ret;
2529                         __u8 *eth;
2530                         struct iphdr *iph;
2531 
2532                         nhead = x->props.header_len - skb_headroom(skb);
2533                         if (nhead > 0) {
2534                                 ret = pskb_expand_head(skb, nhead, 0, GFP_ATOMIC);
2535                                 if (ret < 0) {
2536                                         pr_err("Error expanding ipsec packet %d\n",
2537                                                ret);
2538                                         goto err;
2539                                 }
2540                         }
2541 
2542                         /* ipsec is not expecting ll header */
2543                         skb_pull(skb, ETH_HLEN);
2544                         ret = pktgen_output_ipsec(skb, pkt_dev);
2545                         if (ret) {
2546                                 pr_err("Error creating ipsec packet %d\n", ret);
2547                                 goto err;
2548                         }
2549                         /* restore ll */
2550                         eth = (__u8 *) skb_push(skb, ETH_HLEN);
2551                         memcpy(eth, pkt_dev->hh, 12);
2552                         *(u16 *) &eth[12] = protocol;
2553 
2554                         /* Update IPv4 header len as well as checksum value */
2555                         iph = ip_hdr(skb);
2556                         iph->tot_len = htons(skb->len - ETH_HLEN);
2557                         ip_send_check(iph);
2558                 }
2559         }
2560         return 1;
2561 err:
2562         kfree_skb(skb);
2563         return 0;
2564 }
2565 #endif
2566 
2567 static void mpls_push(__be32 *mpls, struct pktgen_dev *pkt_dev)
2568 {
2569         unsigned int i;
2570         for (i = 0; i < pkt_dev->nr_labels; i++)
2571                 *mpls++ = pkt_dev->labels[i] & ~MPLS_STACK_BOTTOM;
2572 
2573         mpls--;
2574         *mpls |= MPLS_STACK_BOTTOM;
2575 }
2576 
2577 static inline __be16 build_tci(unsigned int id, unsigned int cfi,
2578                                unsigned int prio)
2579 {
2580         return htons(id | (cfi << 12) | (prio << 13));
2581 }
2582 
2583 static void pktgen_finalize_skb(struct pktgen_dev *pkt_dev, struct sk_buff *skb,
2584                                 int datalen)
2585 {
2586         struct timeval timestamp;
2587         struct pktgen_hdr *pgh;
2588 
2589         pgh = (struct pktgen_hdr *)skb_put(skb, sizeof(*pgh));
2590         datalen -= sizeof(*pgh);
2591 
2592         if (pkt_dev->nfrags <= 0) {
2593                 memset(skb_put(skb, datalen), 0, datalen);
2594         } else {
2595                 int frags = pkt_dev->nfrags;
2596                 int i, len;
2597                 int frag_len;
2598 
2599 
2600                 if (frags > MAX_SKB_FRAGS)
2601                         frags = MAX_SKB_FRAGS;
2602                 len = datalen - frags * PAGE_SIZE;
2603                 if (len > 0) {
2604                         memset(skb_put(skb, len), 0, len);
2605                         datalen = frags * PAGE_SIZE;
2606                 }
2607 
2608                 i = 0;
2609                 frag_len = (datalen/frags) < PAGE_SIZE ?
2610                            (datalen/frags) : PAGE_SIZE;
2611                 while (datalen > 0) {
2612                         if (unlikely(!pkt_dev->page)) {
2613                                 int node = numa_node_id();
2614 
2615                                 if (pkt_dev->node >= 0 && (pkt_dev->flags & F_NODE))
2616                                         node = pkt_dev->node;
2617                                 pkt_dev->page = alloc_pages_node(node, GFP_KERNEL | __GFP_ZERO, 0);
2618                                 if (!pkt_dev->page)
2619                                         break;
2620                         }
2621                         get_page(pkt_dev->page);
2622                         skb_frag_set_page(skb, i, pkt_dev->page);
2623                         skb_shinfo(skb)->frags[i].page_offset = 0;
2624                         /*last fragment, fill rest of data*/
2625                         if (i == (frags - 1))
2626                                 skb_frag_size_set(&skb_shinfo(skb)->frags[i],
2627                                     (datalen < PAGE_SIZE ? datalen : PAGE_SIZE));
2628                         else
2629                                 skb_frag_size_set(&skb_shinfo(skb)->frags[i], frag_len);
2630                         datalen -= skb_frag_size(&skb_shinfo(skb)->frags[i]);
2631                         skb->len += skb_frag_size(&skb_shinfo(skb)->frags[i]);
2632                         skb->data_len += skb_frag_size(&skb_shinfo(skb)->frags[i]);
2633                         i++;
2634                         skb_shinfo(skb)->nr_frags = i;
2635                 }
2636         }
2637 
2638         /* Stamp the time, and sequence number,
2639          * convert them to network byte order
2640          */
2641         pgh->pgh_magic = htonl(PKTGEN_MAGIC);
2642         pgh->seq_num = htonl(pkt_dev->seq_num);
2643 
2644         do_gettimeofday(&timestamp);
2645         pgh->tv_sec = htonl(timestamp.tv_sec);
2646         pgh->tv_usec = htonl(timestamp.tv_usec);
2647 }
2648 
2649 static struct sk_buff *pktgen_alloc_skb(struct net_device *dev,
2650                                         struct pktgen_dev *pkt_dev,
2651                                         unsigned int extralen)
2652 {
2653         struct sk_buff *skb = NULL;
2654         unsigned int size = pkt_dev->cur_pkt_size + 64 + extralen +
2655                             pkt_dev->pkt_overhead;
2656 
2657         if (pkt_dev->flags & F_NODE) {
2658                 int node = pkt_dev->node >= 0 ? pkt_dev->node : numa_node_id();
2659 
2660                 skb = __alloc_skb(NET_SKB_PAD + size, GFP_NOWAIT, 0, node);
2661                 if (likely(skb)) {
2662                         skb_reserve(skb, NET_SKB_PAD);
2663                         skb->dev = dev;
2664                 }
2665         } else {
2666                  skb = __netdev_alloc_skb(dev, size, GFP_NOWAIT);
2667         }
2668 
2669         return skb;
2670 }
2671 
2672 static struct sk_buff *fill_packet_ipv4(struct net_device *odev,
2673                                         struct pktgen_dev *pkt_dev)
2674 {
2675         struct sk_buff *skb = NULL;
2676         __u8 *eth;
2677         struct udphdr *udph;
2678         int datalen, iplen;
2679         struct iphdr *iph;
2680         __be16 protocol = htons(ETH_P_IP);
2681         __be32 *mpls;
2682         __be16 *vlan_tci = NULL;                 /* Encapsulates priority and VLAN ID */
2683         __be16 *vlan_encapsulated_proto = NULL;  /* packet type ID field (or len) for VLAN tag */
2684         __be16 *svlan_tci = NULL;                /* Encapsulates priority and SVLAN ID */
2685         __be16 *svlan_encapsulated_proto = NULL; /* packet type ID field (or len) for SVLAN tag */
2686         u16 queue_map;
2687 
2688         if (pkt_dev->nr_labels)
2689                 protocol = htons(ETH_P_MPLS_UC);
2690 
2691         if (pkt_dev->vlan_id != 0xffff)
2692                 protocol = htons(ETH_P_8021Q);
2693 
2694         /* Update any of the values, used when we're incrementing various
2695          * fields.
2696          */
2697         mod_cur_headers(pkt_dev);
2698         queue_map = pkt_dev->cur_queue_map;
2699 
2700         datalen = (odev->hard_header_len + 16) & ~0xf;
2701 
2702         skb = pktgen_alloc_skb(odev, pkt_dev, datalen);
2703         if (!skb) {
2704                 sprintf(pkt_dev->result, "No memory");
2705                 return NULL;
2706         }
2707 
2708         prefetchw(skb->data);
2709         skb_reserve(skb, datalen);
2710 
2711         /*  Reserve for ethernet and IP header  */
2712         eth = (__u8 *) skb_push(skb, 14);
2713         mpls = (__be32 *)skb_put(skb, pkt_dev->nr_labels*sizeof(__u32));
2714         if (pkt_dev->nr_labels)
2715                 mpls_push(mpls, pkt_dev);
2716 
2717         if (pkt_dev->vlan_id != 0xffff) {
2718                 if (pkt_dev->svlan_id != 0xffff) {
2719                         svlan_tci = (__be16 *)skb_put(skb, sizeof(__be16));
2720                         *svlan_tci = build_tci(pkt_dev->svlan_id,
2721                                                pkt_dev->svlan_cfi,
2722                                                pkt_dev->svlan_p);
2723                         svlan_encapsulated_proto = (__be16 *)skb_put(skb, sizeof(__be16));
2724                         *svlan_encapsulated_proto = htons(ETH_P_8021Q);
2725                 }
2726                 vlan_tci = (__be16 *)skb_put(skb, sizeof(__be16));
2727                 *vlan_tci = build_tci(pkt_dev->vlan_id,
2728                                       pkt_dev->vlan_cfi,
2729                                       pkt_dev->vlan_p);
2730                 vlan_encapsulated_proto = (__be16 *)skb_put(skb, sizeof(__be16));
2731                 *vlan_encapsulated_proto = htons(ETH_P_IP);
2732         }
2733 
2734         skb_set_mac_header(skb, 0);
2735         skb_set_network_header(skb, skb->len);
2736         iph = (struct iphdr *) skb_put(skb, sizeof(struct iphdr));
2737 
2738         skb_set_transport_header(skb, skb->len);
2739         udph = (struct udphdr *) skb_put(skb, sizeof(struct udphdr));
2740         skb_set_queue_mapping(skb, queue_map);
2741         skb->priority = pkt_dev->skb_priority;
2742 
2743         memcpy(eth, pkt_dev->hh, 12);
2744         *(__be16 *) & eth[12] = protocol;
2745 
2746         /* Eth + IPh + UDPh + mpls */
2747         datalen = pkt_dev->cur_pkt_size - 14 - 20 - 8 -
2748                   pkt_dev->pkt_overhead;
2749         if (datalen < 0 || datalen < sizeof(struct pktgen_hdr))
2750                 datalen = sizeof(struct pktgen_hdr);
2751 
2752         udph->source = htons(pkt_dev->cur_udp_src);
2753         udph->dest = htons(pkt_dev->cur_udp_dst);
2754         udph->len = htons(datalen + 8); /* DATA + udphdr */
2755         udph->check = 0;
2756 
2757         iph->ihl = 5;
2758         iph->version = 4;
2759         iph->ttl = 32;
2760         iph->tos = pkt_dev->tos;
2761         iph->protocol = IPPROTO_UDP;    /* UDP */
2762         iph->saddr = pkt_dev->cur_saddr;
2763         iph->daddr = pkt_dev->cur_daddr;
2764         iph->id = htons(pkt_dev->ip_id);
2765         pkt_dev->ip_id++;
2766         iph->frag_off = 0;
2767         iplen = 20 + 8 + datalen;
2768         iph->tot_len = htons(iplen);
2769         ip_send_check(iph);
2770         skb->protocol = protocol;
2771         skb->dev = odev;
2772         skb->pkt_type = PACKET_HOST;
2773 
2774         if (!(pkt_dev->flags & F_UDPCSUM)) {
2775                 skb->ip_summed = CHECKSUM_NONE;
2776         } else if (odev->features & NETIF_F_V4_CSUM) {
2777                 skb->ip_summed = CHECKSUM_PARTIAL;
2778                 skb->csum = 0;
2779                 udp4_hwcsum(skb, udph->source, udph->dest);
2780         } else {
2781                 __wsum csum = udp_csum(skb);
2782 
2783                 /* add protocol-dependent pseudo-header */
2784                 udph->check = csum_tcpudp_magic(udph->source, udph->dest,
2785                                                 datalen + 8, IPPROTO_UDP, csum);
2786 
2787                 if (udph->check == 0)
2788                         udph->check = CSUM_MANGLED_0;
2789         }
2790 
2791         pktgen_finalize_skb(pkt_dev, skb, datalen);
2792 
2793 #ifdef CONFIG_XFRM
2794         if (!process_ipsec(pkt_dev, skb, protocol))
2795                 return NULL;
2796 #endif
2797 
2798         return skb;
2799 }
2800 
2801 static struct sk_buff *fill_packet_ipv6(struct net_device *odev,
2802                                         struct pktgen_dev *pkt_dev)
2803 {
2804         struct sk_buff *skb = NULL;
2805         __u8 *eth;
2806         struct udphdr *udph;
2807         int datalen, udplen;
2808         struct ipv6hdr *iph;
2809         __be16 protocol = htons(ETH_P_IPV6);
2810         __be32 *mpls;
2811         __be16 *vlan_tci = NULL;                 /* Encapsulates priority and VLAN ID */
2812         __be16 *vlan_encapsulated_proto = NULL;  /* packet type ID field (or len) for VLAN tag */
2813         __be16 *svlan_tci = NULL;                /* Encapsulates priority and SVLAN ID */
2814         __be16 *svlan_encapsulated_proto = NULL; /* packet type ID field (or len) for SVLAN tag */
2815         u16 queue_map;
2816 
2817         if (pkt_dev->nr_labels)
2818                 protocol = htons(ETH_P_MPLS_UC);
2819 
2820         if (pkt_dev->vlan_id != 0xffff)
2821                 protocol = htons(ETH_P_8021Q);
2822 
2823         /* Update any of the values, used when we're incrementing various
2824          * fields.
2825          */
2826         mod_cur_headers(pkt_dev);
2827         queue_map = pkt_dev->cur_queue_map;
2828 
2829         skb = pktgen_alloc_skb(odev, pkt_dev, 16);
2830         if (!skb) {
2831                 sprintf(pkt_dev->result, "No memory");
2832                 return NULL;
2833         }
2834 
2835         prefetchw(skb->data);
2836         skb_reserve(skb, 16);
2837 
2838         /*  Reserve for ethernet and IP header  */
2839         eth = (__u8 *) skb_push(skb, 14);
2840         mpls = (__be32 *)skb_put(skb, pkt_dev->nr_labels*sizeof(__u32));
2841         if (pkt_dev->nr_labels)
2842                 mpls_push(mpls, pkt_dev);
2843 
2844         if (pkt_dev->vlan_id != 0xffff) {
2845                 if (pkt_dev->svlan_id != 0xffff) {
2846                         svlan_tci = (__be16 *)skb_put(skb, sizeof(__be16));
2847                         *svlan_tci = build_tci(pkt_dev->svlan_id,
2848                                                pkt_dev->svlan_cfi,
2849                                                pkt_dev->svlan_p);
2850                         svlan_encapsulated_proto = (__be16 *)skb_put(skb, sizeof(__be16));
2851                         *svlan_encapsulated_proto = htons(ETH_P_8021Q);
2852                 }
2853                 vlan_tci = (__be16 *)skb_put(skb, sizeof(__be16));
2854                 *vlan_tci = build_tci(pkt_dev->vlan_id,
2855                                       pkt_dev->vlan_cfi,
2856                                       pkt_dev->vlan_p);
2857                 vlan_encapsulated_proto = (__be16 *)skb_put(skb, sizeof(__be16));
2858                 *vlan_encapsulated_proto = htons(ETH_P_IPV6);
2859         }
2860 
2861         skb_set_mac_header(skb, 0);
2862         skb_set_network_header(skb, skb->len);
2863         iph = (struct ipv6hdr *) skb_put(skb, sizeof(struct ipv6hdr));
2864 
2865         skb_set_transport_header(skb, skb->len);
2866         udph = (struct udphdr *) skb_put(skb, sizeof(struct udphdr));
2867         skb_set_queue_mapping(skb, queue_map);
2868         skb->priority = pkt_dev->skb_priority;
2869 
2870         memcpy(eth, pkt_dev->hh, 12);
2871         *(__be16 *) &eth[12] = protocol;
2872 
2873         /* Eth + IPh + UDPh + mpls */
2874         datalen = pkt_dev->cur_pkt_size - 14 -
2875                   sizeof(struct ipv6hdr) - sizeof(struct udphdr) -
2876                   pkt_dev->pkt_overhead;
2877 
2878         if (datalen < 0 || datalen < sizeof(struct pktgen_hdr)) {
2879                 datalen = sizeof(struct pktgen_hdr);
2880                 net_info_ratelimited("increased datalen to %d\n", datalen);
2881         }
2882 
2883         udplen = datalen + sizeof(struct udphdr);
2884         udph->source = htons(pkt_dev->cur_udp_src);
2885         udph->dest = htons(pkt_dev->cur_udp_dst);
2886         udph->len = htons(udplen);
2887         udph->check = 0;
2888 
2889         *(__be32 *) iph = htonl(0x60000000);    /* Version + flow */
2890 
2891         if (pkt_dev->traffic_class) {
2892                 /* Version + traffic class + flow (0) */
2893                 *(__be32 *)iph |= htonl(0x60000000 | (pkt_dev->traffic_class << 20));
2894         }
2895 
2896         iph->hop_limit = 32;
2897 
2898         iph->payload_len = htons(udplen);
2899         iph->nexthdr = IPPROTO_UDP;
2900 
2901         iph->daddr = pkt_dev->cur_in6_daddr;
2902         iph->saddr = pkt_dev->cur_in6_saddr;
2903 
2904         skb->protocol = protocol;
2905         skb->dev = odev;
2906         skb->pkt_type = PACKET_HOST;
2907 
2908         if (!(pkt_dev->flags & F_UDPCSUM)) {
2909                 skb->ip_summed = CHECKSUM_NONE;
2910         } else if (odev->features & NETIF_F_V6_CSUM) {
2911                 skb->ip_summed = CHECKSUM_PARTIAL;
2912                 skb->csum_start = skb_transport_header(skb) - skb->head;
2913                 skb->csum_offset = offsetof(struct udphdr, check);
2914                 udph->check = ~csum_ipv6_magic(&iph->saddr, &iph->daddr, udplen, IPPROTO_UDP, 0);
2915         } else {
2916                 __wsum csum = udp_csum(skb);
2917 
2918                 /* add protocol-dependent pseudo-header */
2919                 udph->check = csum_ipv6_magic(&iph->saddr, &iph->daddr, udplen, IPPROTO_UDP, csum);
2920 
2921                 if (udph->check == 0)
2922                         udph->check = CSUM_MANGLED_0;
2923         }
2924 
2925         pktgen_finalize_skb(pkt_dev, skb, datalen);
2926 
2927         return skb;
2928 }
2929 
2930 static struct sk_buff *fill_packet(struct net_device *odev,
2931                                    struct pktgen_dev *pkt_dev)
2932 {
2933         if (pkt_dev->flags & F_IPV6)
2934                 return fill_packet_ipv6(odev, pkt_dev);
2935         else
2936                 return fill_packet_ipv4(odev, pkt_dev);
2937 }
2938 
2939 static void pktgen_clear_counters(struct pktgen_dev *pkt_dev)
2940 {
2941         pkt_dev->seq_num = 1;
2942         pkt_dev->idle_acc = 0;
2943         pkt_dev->sofar = 0;
2944         pkt_dev->tx_bytes = 0;
2945         pkt_dev->errors = 0;
2946 }
2947 
2948 /* Set up structure for sending pkts, clear counters */
2949 
2950 static void pktgen_run(struct pktgen_thread *t)
2951 {
2952         struct pktgen_dev *pkt_dev;
2953         int started = 0;
2954 
2955         func_enter();
2956 
2957         if_lock(t);
2958         list_for_each_entry(pkt_dev, &t->if_list, list) {
2959 
2960                 /*
2961                  * setup odev and create initial packet.
2962                  */
2963                 pktgen_setup_inject(pkt_dev);
2964 
2965                 if (pkt_dev->odev) {
2966                         pktgen_clear_counters(pkt_dev);
2967                         pkt_dev->running = 1;   /* Cranke yeself! */
2968                         pkt_dev->skb = NULL;
2969                         pkt_dev->started_at = pkt_dev->next_tx = ktime_get();
2970 
2971                         set_pkt_overhead(pkt_dev);
2972 
2973                         strcpy(pkt_dev->result, "Starting");
2974                         started++;
2975                 } else
2976                         strcpy(pkt_dev->result, "Error starting");
2977         }
2978         if_unlock(t);
2979         if (started)
2980                 t->control &= ~(T_STOP);
2981 }
2982 
2983 static void pktgen_stop_all_threads_ifs(struct pktgen_net *pn)
2984 {
2985         struct pktgen_thread *t;
2986 
2987         func_enter();
2988 
2989         mutex_lock(&pktgen_thread_lock);
2990 
2991         list_for_each_entry(t, &pn->pktgen_threads, th_list)
2992                 t->control |= T_STOP;
2993 
2994         mutex_unlock(&pktgen_thread_lock);
2995 }
2996 
2997 static int thread_is_running(const struct pktgen_thread *t)
2998 {
2999         const struct pktgen_dev *pkt_dev;
3000 
3001         list_for_each_entry(pkt_dev, &t->if_list, list)
3002                 if (pkt_dev->running)
3003                         return 1;
3004         return 0;
3005 }
3006 
3007 static int pktgen_wait_thread_run(struct pktgen_thread *t)
3008 {
3009         if_lock(t);
3010 
3011         while (thread_is_running(t)) {
3012 
3013                 if_unlock(t);
3014 
3015                 msleep_interruptible(100);
3016 
3017                 if (signal_pending(current))
3018                         goto signal;
3019                 if_lock(t);
3020         }
3021         if_unlock(t);
3022         return 1;
3023 signal:
3024         return 0;
3025 }
3026 
3027 static int pktgen_wait_all_threads_run(struct pktgen_net *pn)
3028 {
3029         struct pktgen_thread *t;
3030         int sig = 1;
3031 
3032         mutex_lock(&pktgen_thread_lock);
3033 
3034         list_for_each_entry(t, &pn->pktgen_threads, th_list) {
3035                 sig = pktgen_wait_thread_run(t);
3036                 if (sig == 0)
3037                         break;
3038         }
3039 
3040         if (sig == 0)
3041                 list_for_each_entry(t, &pn->pktgen_threads, th_list)
3042                         t->control |= (T_STOP);
3043 
3044         mutex_unlock(&pktgen_thread_lock);
3045         return sig;
3046 }
3047 
3048 static void pktgen_run_all_threads(struct pktgen_net *pn)
3049 {
3050         struct pktgen_thread *t;
3051 
3052         func_enter();
3053 
3054         mutex_lock(&pktgen_thread_lock);
3055 
3056         list_for_each_entry(t, &pn->pktgen_threads, th_list)
3057                 t->control |= (T_RUN);
3058 
3059         mutex_unlock(&pktgen_thread_lock);
3060 
3061         /* Propagate thread->control  */
3062         schedule_timeout_interruptible(msecs_to_jiffies(125));
3063 
3064         pktgen_wait_all_threads_run(pn);
3065 }
3066 
3067 static void pktgen_reset_all_threads(struct pktgen_net *pn)
3068 {
3069         struct pktgen_thread *t;
3070 
3071         func_enter();
3072 
3073         mutex_lock(&pktgen_thread_lock);
3074 
3075         list_for_each_entry(t, &pn->pktgen_threads, th_list)
3076                 t->control |= (T_REMDEVALL);
3077 
3078         mutex_unlock(&pktgen_thread_lock);
3079 
3080         /* Propagate thread->control  */
3081         schedule_timeout_interruptible(msecs_to_jiffies(125));
3082 
3083         pktgen_wait_all_threads_run(pn);
3084 }
3085 
3086 static void show_results(struct pktgen_dev *pkt_dev, int nr_frags)
3087 {
3088         __u64 bps, mbps, pps;
3089         char *p = pkt_dev->result;
3090         ktime_t elapsed = ktime_sub(pkt_dev->stopped_at,
3091                                     pkt_dev->started_at);
3092         ktime_t idle = ns_to_ktime(pkt_dev->idle_acc);
3093 
3094         p += sprintf(p, "OK: %llu(c%llu+d%llu) usec, %llu (%dbyte,%dfrags)\n",
3095                      (unsigned long long)ktime_to_us(elapsed),
3096                      (unsigned long long)ktime_to_us(ktime_sub(elapsed, idle)),
3097                      (unsigned long long)ktime_to_us(idle),
3098                      (unsigned long long)pkt_dev->sofar,
3099                      pkt_dev->cur_pkt_size, nr_frags);
3100 
3101         pps = div64_u64(pkt_dev->sofar * NSEC_PER_SEC,
3102                         ktime_to_ns(elapsed));
3103 
3104         bps = pps * 8 * pkt_dev->cur_pkt_size;
3105 
3106         mbps = bps;
3107         do_div(mbps, 1000000);
3108         p += sprintf(p, "  %llupps %lluMb/sec (%llubps) errors: %llu",
3109                      (unsigned long long)pps,
3110                      (unsigned long long)mbps,
3111                      (unsigned long long)bps,
3112                      (unsigned long long)pkt_dev->errors);
3113 }
3114 
3115 /* Set stopped-at timer, remove from running list, do counters & statistics */
3116 static int pktgen_stop_device(struct pktgen_dev *pkt_dev)
3117 {
3118         int nr_frags = pkt_dev->skb ? skb_shinfo(pkt_dev->skb)->nr_frags : -1;
3119 
3120         if (!pkt_dev->running) {
3121                 pr_warning("interface: %s is already stopped\n",
3122                            pkt_dev->odevname);
3123                 return -EINVAL;
3124         }
3125 
3126         kfree_skb(pkt_dev->skb);
3127         pkt_dev->skb = NULL;
3128         pkt_dev->stopped_at = ktime_get();
3129         pkt_dev->running = 0;
3130 
3131         show_results(pkt_dev, nr_frags);
3132 
3133         return 0;
3134 }
3135 
3136 static struct pktgen_dev *next_to_run(struct pktgen_thread *t)
3137 {
3138         struct pktgen_dev *pkt_dev, *best = NULL;
3139 
3140         if_lock(t);
3141 
3142         list_for_each_entry(pkt_dev, &t->if_list, list) {
3143                 if (!pkt_dev->running)
3144                         continue;
3145                 if (best == NULL)
3146                         best = pkt_dev;
3147                 else if (ktime_compare(pkt_dev->next_tx, best->next_tx) < 0)
3148                         best = pkt_dev;
3149         }
3150         if_unlock(t);
3151         return best;
3152 }
3153 
3154 static void pktgen_stop(struct pktgen_thread *t)
3155 {
3156         struct pktgen_dev *pkt_dev;
3157 
3158         func_enter();
3159 
3160         if_lock(t);
3161 
3162         list_for_each_entry(pkt_dev, &t->if_list, list) {
3163                 pktgen_stop_device(pkt_dev);
3164         }
3165 
3166         if_unlock(t);
3167 }
3168 
3169 /*
3170  * one of our devices needs to be removed - find it
3171  * and remove it
3172  */
3173 static void pktgen_rem_one_if(struct pktgen_thread *t)
3174 {
3175         struct list_head *q, *n;
3176         struct pktgen_dev *cur;
3177 
3178         func_enter();
3179 
3180         if_lock(t);
3181 
3182         list_for_each_safe(q, n, &t->if_list) {
3183                 cur = list_entry(q, struct pktgen_dev, list);
3184 
3185                 if (!cur->removal_mark)
3186                         continue;
3187 
3188                 kfree_skb(cur->skb);
3189                 cur->skb = NULL;
3190 
3191                 pktgen_remove_device(t, cur);
3192 
3193                 break;
3194         }
3195 
3196         if_unlock(t);
3197 }
3198 
3199 static void pktgen_rem_all_ifs(struct pktgen_thread *t)
3200 {
3201         struct list_head *q, *n;
3202         struct pktgen_dev *cur;
3203 
3204         func_enter();
3205 
3206         /* Remove all devices, free mem */
3207 
3208         if_lock(t);
3209 
3210         list_for_each_safe(q, n, &t->if_list) {
3211                 cur = list_entry(q, struct pktgen_dev, list);
3212 
3213                 kfree_skb(cur->skb);
3214                 cur->skb = NULL;
3215 
3216                 pktgen_remove_device(t, cur);
3217         }
3218 
3219         if_unlock(t);
3220 }
3221 
3222 static void pktgen_rem_thread(struct pktgen_thread *t)
3223 {
3224         /* Remove from the thread list */
3225         remove_proc_entry(t->tsk->comm, t->net->proc_dir);
3226 }
3227 
3228 static void pktgen_resched(struct pktgen_dev *pkt_dev)
3229 {
3230         ktime_t idle_start = ktime_get();
3231         schedule();
3232         pkt_dev->idle_acc += ktime_to_ns(ktime_sub(ktime_get(), idle_start));
3233 }
3234 
3235 static void pktgen_wait_for_skb(struct pktgen_dev *pkt_dev)
3236 {
3237         ktime_t idle_start = ktime_get();
3238 
3239         while (atomic_read(&(pkt_dev->skb->users)) != 1) {
3240                 if (signal_pending(current))
3241                         break;
3242 
3243                 if (need_resched())
3244                         pktgen_resched(pkt_dev);
3245                 else
3246                         cpu_relax();
3247         }
3248         pkt_dev->idle_acc += ktime_to_ns(ktime_sub(ktime_get(), idle_start));
3249 }
3250 
3251 static void pktgen_xmit(struct pktgen_dev *pkt_dev)
3252 {
3253         struct net_device *odev = pkt_dev->odev;
3254         netdev_tx_t (*xmit)(struct sk_buff *, struct net_device *)
3255                 = odev->netdev_ops->ndo_start_xmit;
3256         struct netdev_queue *txq;
3257         u16 queue_map;
3258         int ret;
3259 
3260         /* If device is offline, then don't send */
3261         if (unlikely(!netif_running(odev) || !netif_carrier_ok(odev))) {
3262                 pktgen_stop_device(pkt_dev);
3263                 return;
3264         }
3265 
3266         /* This is max DELAY, this has special meaning of
3267          * "never transmit"
3268          */
3269         if (unlikely(pkt_dev->delay == ULLONG_MAX)) {
3270                 pkt_dev->next_tx = ktime_add_ns(ktime_get(), ULONG_MAX);
3271                 return;
3272         }
3273 
3274         /* If no skb or clone count exhausted then get new one */
3275         if (!pkt_dev->skb || (pkt_dev->last_ok &&
3276                               ++pkt_dev->clone_count >= pkt_dev->clone_skb)) {
3277                 /* build a new pkt */
3278                 kfree_skb(pkt_dev->skb);
3279 
3280                 pkt_dev->skb = fill_packet(odev, pkt_dev);
3281                 if (pkt_dev->skb == NULL) {
3282                         pr_err("ERROR: couldn't allocate skb in fill_packet\n");
3283                         schedule();
3284                         pkt_dev->clone_count--; /* back out increment, OOM */
3285                         return;
3286                 }
3287                 pkt_dev->last_pkt_size = pkt_dev->skb->len;
3288                 pkt_dev->allocated_skbs++;
3289                 pkt_dev->clone_count = 0;       /* reset counter */
3290         }
3291 
3292         if (pkt_dev->delay && pkt_dev->last_ok)
3293                 spin(pkt_dev, pkt_dev->next_tx);
3294 
3295         queue_map = skb_get_queue_mapping(pkt_dev->skb);
3296         txq = netdev_get_tx_queue(odev, queue_map);
3297 
3298         __netif_tx_lock_bh(txq);
3299 
3300         if (unlikely(netif_xmit_frozen_or_stopped(txq))) {
3301                 ret = NETDEV_TX_BUSY;
3302                 pkt_dev->last_ok = 0;
3303                 goto unlock;
3304         }
3305         atomic_inc(&(pkt_dev->skb->users));
3306         ret = (*xmit)(pkt_dev->skb, odev);
3307 
3308         switch (ret) {
3309         case NETDEV_TX_OK:
3310                 txq_trans_update(txq);
3311                 pkt_dev->last_ok = 1;
3312                 pkt_dev->sofar++;
3313                 pkt_dev->seq_num++;
3314                 pkt_dev->tx_bytes += pkt_dev->last_pkt_size;
3315                 break;
3316         case NET_XMIT_DROP:
3317         case NET_XMIT_CN:
3318         case NET_XMIT_POLICED:
3319                 /* skb has been consumed */
3320                 pkt_dev->errors++;
3321                 break;
3322         default: /* Drivers are not supposed to return other values! */
3323                 net_info_ratelimited("%s xmit error: %d\n",
3324                                      pkt_dev->odevname, ret);
3325                 pkt_dev->errors++;
3326                 /* fallthru */
3327         case NETDEV_TX_LOCKED:
3328         case NETDEV_TX_BUSY:
3329                 /* Retry it next time */
3330                 atomic_dec(&(pkt_dev->skb->users));
3331                 pkt_dev->last_ok = 0;
3332         }
3333 unlock:
3334         __netif_tx_unlock_bh(txq);
3335 
3336         /* If pkt_dev->count is zero, then run forever */
3337         if ((pkt_dev->count != 0) && (pkt_dev->sofar >= pkt_dev->count)) {
3338                 pktgen_wait_for_skb(pkt_dev);
3339 
3340                 /* Done with this */
3341                 pktgen_stop_device(pkt_dev);
3342         }
3343 }
3344 
3345 /*
3346  * Main loop of the thread goes here
3347  */
3348 
3349 static int pktgen_thread_worker(void *arg)
3350 {
3351         DEFINE_WAIT(wait);
3352         struct pktgen_thread *t = arg;
3353         struct pktgen_dev *pkt_dev = NULL;
3354         int cpu = t->cpu;
3355 
3356         BUG_ON(smp_processor_id() != cpu);
3357 
3358         init_waitqueue_head(&t->queue);
3359         complete(&t->start_done);
3360 
3361         pr_debug("starting pktgen/%d:  pid=%d\n", cpu, task_pid_nr(current));
3362 
3363         set_current_state(TASK_INTERRUPTIBLE);
3364 
3365         set_freezable();
3366 
3367         while (!kthread_should_stop()) {
3368                 pkt_dev = next_to_run(t);
3369 
3370                 if (unlikely(!pkt_dev && t->control == 0)) {
3371                         if (t->net->pktgen_exiting)
3372                                 break;
3373                         wait_event_interruptible_timeout(t->queue,
3374                                                          t->control != 0,
3375                                                          HZ/10);
3376                         try_to_freeze();
3377                         continue;
3378                 }
3379 
3380                 __set_current_state(TASK_RUNNING);
3381 
3382                 if (likely(pkt_dev)) {
3383                         pktgen_xmit(pkt_dev);
3384 
3385                         if (need_resched())
3386                                 pktgen_resched(pkt_dev);
3387                         else
3388                                 cpu_relax();
3389                 }
3390 
3391                 if (t->control & T_STOP) {
3392                         pktgen_stop(t);
3393                         t->control &= ~(T_STOP);
3394                 }
3395 
3396                 if (t->control & T_RUN) {
3397                         pktgen_run(t);
3398                         t->control &= ~(T_RUN);
3399                 }
3400 
3401                 if (t->control & T_REMDEVALL) {
3402                         pktgen_rem_all_ifs(t);
3403                         t->control &= ~(T_REMDEVALL);
3404                 }
3405 
3406                 if (t->control & T_REMDEV) {
3407                         pktgen_rem_one_if(t);
3408                         t->control &= ~(T_REMDEV);
3409                 }
3410 
3411                 try_to_freeze();
3412 
3413                 set_current_state(TASK_INTERRUPTIBLE);
3414         }
3415 
3416         pr_debug("%s stopping all device\n", t->tsk->comm);
3417         pktgen_stop(t);
3418 
3419         pr_debug("%s removing all device\n", t->tsk->comm);
3420         pktgen_rem_all_ifs(t);
3421 
3422         pr_debug("%s removing thread\n", t->tsk->comm);
3423         pktgen_rem_thread(t);
3424 
3425         /* Wait for kthread_stop */
3426         while (!kthread_should_stop()) {
3427                 set_current_state(TASK_INTERRUPTIBLE);
3428                 schedule();
3429         }
3430         __set_current_state(TASK_RUNNING);
3431 
3432         return 0;
3433 }
3434 
3435 static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t,
3436                                           const char *ifname, bool exact)
3437 {
3438         struct pktgen_dev *p, *pkt_dev = NULL;
3439         size_t len = strlen(ifname);
3440 
3441         if_lock(t);
3442         list_for_each_entry(p, &t->if_list, list)
3443                 if (strncmp(p->odevname, ifname, len) == 0) {
3444                         if (p->odevname[len]) {
3445                                 if (exact || p->odevname[len] != '@')
3446                                         continue;
3447                         }
3448                         pkt_dev = p;
3449                         break;
3450                 }
3451 
3452         if_unlock(t);
3453         pr_debug("find_dev(%s) returning %p\n", ifname, pkt_dev);
3454         return pkt_dev;
3455 }
3456 
3457 /*
3458  * Adds a dev at front of if_list.
3459  */
3460 
3461 static int add_dev_to_thread(struct pktgen_thread *t,
3462                              struct pktgen_dev *pkt_dev)
3463 {
3464         int rv = 0;
3465 
3466         if_lock(t);
3467 
3468         if (pkt_dev->pg_thread) {
3469                 pr_err("ERROR: already assigned to a thread\n");
3470                 rv = -EBUSY;
3471                 goto out;
3472         }
3473 
3474         list_add(&pkt_dev->list, &t->if_list);
3475         pkt_dev->pg_thread = t;
3476         pkt_dev->running = 0;
3477 
3478 out:
3479         if_unlock(t);
3480         return rv;
3481 }
3482 
3483 /* Called under thread lock */
3484 
3485 static int pktgen_add_device(struct pktgen_thread *t, const char *ifname)
3486 {
3487         struct pktgen_dev *pkt_dev;
3488         int err;
3489         int node = cpu_to_node(t->cpu);
3490 
3491         /* We don't allow a device to be on several threads */
3492 
3493         pkt_dev = __pktgen_NN_threads(t->net, ifname, FIND);
3494         if (pkt_dev) {
3495                 pr_err("ERROR: interface already used\n");
3496                 return -EBUSY;
3497         }
3498 
3499         pkt_dev = kzalloc_node(sizeof(struct pktgen_dev), GFP_KERNEL, node);
3500         if (!pkt_dev)
3501                 return -ENOMEM;
3502 
3503         strcpy(pkt_dev->odevname, ifname);
3504         pkt_dev->flows = vzalloc_node(MAX_CFLOWS * sizeof(struct flow_state),
3505                                       node);
3506         if (pkt_dev->flows == NULL) {
3507                 kfree(pkt_dev);
3508                 return -ENOMEM;
3509         }
3510 
3511         pkt_dev->removal_mark = 0;
3512         pkt_dev->nfrags = 0;
3513         pkt_dev->delay = pg_delay_d;
3514         pkt_dev->count = pg_count_d;
3515         pkt_dev->sofar = 0;
3516         pkt_dev->udp_src_min = 9;       /* sink port */
3517         pkt_dev->udp_src_max = 9;
3518         pkt_dev->udp_dst_min = 9;
3519         pkt_dev->udp_dst_max = 9;
3520         pkt_dev->vlan_p = 0;
3521         pkt_dev->vlan_cfi = 0;
3522         pkt_dev->vlan_id = 0xffff;
3523         pkt_dev->svlan_p = 0;
3524         pkt_dev->svlan_cfi = 0;
3525         pkt_dev->svlan_id = 0xffff;
3526         pkt_dev->node = -1;
3527 
3528         err = pktgen_setup_dev(t->net, pkt_dev, ifname);
3529         if (err)
3530                 goto out1;
3531         if (pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)
3532                 pkt_dev->clone_skb = pg_clone_skb_d;
3533 
3534         pkt_dev->entry = proc_create_data(ifname, 0600, t->net->proc_dir,
3535                                           &pktgen_if_fops, pkt_dev);
3536         if (!pkt_dev->entry) {
3537                 pr_err("cannot create %s/%s procfs entry\n",
3538                        PG_PROC_DIR, ifname);
3539                 err = -EINVAL;
3540                 goto out2;
3541         }
3542 #ifdef CONFIG_XFRM
3543         pkt_dev->ipsmode = XFRM_MODE_TRANSPORT;
3544         pkt_dev->ipsproto = IPPROTO_ESP;
3545 #endif
3546 
3547         return add_dev_to_thread(t, pkt_dev);
3548 out2:
3549         dev_put(pkt_dev->odev);
3550 out1:
3551 #ifdef CONFIG_XFRM
3552         free_SAs(pkt_dev);
3553 #endif
3554         vfree(pkt_dev->flows);
3555         kfree(pkt_dev);
3556         return err;
3557 }
3558 
3559 static int __net_init pktgen_create_thread(int cpu, struct pktgen_net *pn)
3560 {
3561         struct pktgen_thread *t;
3562         struct proc_dir_entry *pe;
3563         struct task_struct *p;
3564 
3565         t = kzalloc_node(sizeof(struct pktgen_thread), GFP_KERNEL,
3566                          cpu_to_node(cpu));
3567         if (!t) {
3568                 pr_err("ERROR: out of memory, can't create new thread\n");
3569                 return -ENOMEM;
3570         }
3571 
3572         spin_lock_init(&t->if_lock);
3573         t->cpu = cpu;
3574 
3575         INIT_LIST_HEAD(&t->if_list);
3576 
3577         list_add_tail(&t->th_list, &pn->pktgen_threads);
3578         init_completion(&t->start_done);
3579 
3580         p = kthread_create_on_node(pktgen_thread_worker,
3581                                    t,
3582                                    cpu_to_node(cpu),
3583                                    "kpktgend_%d", cpu);
3584         if (IS_ERR(p)) {
3585                 pr_err("kernel_thread() failed for cpu %d\n", t->cpu);
3586                 list_del(&t->th_list);
3587                 kfree(t);
3588                 return PTR_ERR(p);
3589         }
3590         kthread_bind(p, cpu);
3591         t->tsk = p;
3592 
3593         pe = proc_create_data(t->tsk->comm, 0600, pn->proc_dir,
3594                               &pktgen_thread_fops, t);
3595         if (!pe) {
3596                 pr_err("cannot create %s/%s procfs entry\n",
3597                        PG_PROC_DIR, t->tsk->comm);
3598                 kthread_stop(p);
3599                 list_del(&t->th_list);
3600                 kfree(t);
3601                 return -EINVAL;
3602         }
3603 
3604         t->net = pn;
3605         wake_up_process(p);
3606         wait_for_completion(&t->start_done);
3607 
3608         return 0;
3609 }
3610 
3611 /*
3612  * Removes a device from the thread if_list.
3613  */
3614 static void _rem_dev_from_if_list(struct pktgen_thread *t,
3615                                   struct pktgen_dev *pkt_dev)
3616 {
3617         struct list_head *q, *n;
3618         struct pktgen_dev *p;
3619 
3620         list_for_each_safe(q, n, &t->if_list) {
3621                 p = list_entry(q, struct pktgen_dev, list);
3622                 if (p == pkt_dev)
3623                         list_del(&p->list);
3624         }
3625 }
3626 
3627 static int pktgen_remove_device(struct pktgen_thread *t,
3628                                 struct pktgen_dev *pkt_dev)
3629 {
3630         pr_debug("remove_device pkt_dev=%p\n", pkt_dev);
3631 
3632         if (pkt_dev->running) {
3633                 pr_warning("WARNING: trying to remove a running interface, stopping it now\n");
3634                 pktgen_stop_device(pkt_dev);
3635         }
3636 
3637         /* Dis-associate from the interface */
3638 
3639         if (pkt_dev->odev) {
3640                 dev_put(pkt_dev->odev);
3641                 pkt_dev->odev = NULL;
3642         }
3643 
3644         /* And update the thread if_list */
3645 
3646         _rem_dev_from_if_list(t, pkt_dev);
3647 
3648         if (pkt_dev->entry)
3649                 proc_remove(pkt_dev->entry);
3650 
3651 #ifdef CONFIG_XFRM
3652         free_SAs(pkt_dev);
3653 #endif
3654         vfree(pkt_dev->flows);
3655         if (pkt_dev->page)
3656                 put_page(pkt_dev->page);
3657         kfree(pkt_dev);
3658         return 0;
3659 }
3660 
3661 static int __net_init pg_net_init(struct net *net)
3662 {
3663         struct pktgen_net *pn = net_generic(net, pg_net_id);
3664         struct proc_dir_entry *pe;
3665         int cpu, ret = 0;
3666 
3667         pn->net = net;
3668         INIT_LIST_HEAD(&pn->pktgen_threads);
3669         pn->pktgen_exiting = false;
3670         pn->proc_dir = proc_mkdir(PG_PROC_DIR, pn->net->proc_net);
3671         if (!pn->proc_dir) {
3672                 pr_warn("cannot create /proc/net/%s\n", PG_PROC_DIR);
3673                 return -ENODEV;
3674         }
3675         pe = proc_create(PGCTRL, 0600, pn->proc_dir, &pktgen_fops);
3676         if (pe == NULL) {
3677                 pr_err("cannot create %s procfs entry\n", PGCTRL);
3678                 ret = -EINVAL;
3679                 goto remove;
3680         }
3681 
3682         for_each_online_cpu(cpu) {
3683                 int err;
3684 
3685                 err = pktgen_create_thread(cpu, pn);
3686                 if (err)
3687                         pr_warn("Cannot create thread for cpu %d (%d)\n",
3688                                    cpu, err);
3689         }
3690 
3691         if (list_empty(&pn->pktgen_threads)) {
3692                 pr_err("Initialization failed for all threads\n");
3693                 ret = -ENODEV;
3694                 goto remove_entry;
3695         }
3696 
3697         return 0;
3698 
3699 remove_entry:
3700         remove_proc_entry(PGCTRL, pn->proc_dir);
3701 remove:
3702         remove_proc_entry(PG_PROC_DIR, pn->net->proc_net);
3703         return ret;
3704 }
3705 
3706 static void __net_exit pg_net_exit(struct net *net)
3707 {
3708         struct pktgen_net *pn = net_generic(net, pg_net_id);
3709         struct pktgen_thread *t;
3710         struct list_head *q, *n;
3711         LIST_HEAD(list);
3712 
3713         /* Stop all interfaces & threads */
3714         pn->pktgen_exiting = true;
3715 
3716         mutex_lock(&pktgen_thread_lock);
3717         list_splice_init(&pn->pktgen_threads, &list);
3718         mutex_unlock(&pktgen_thread_lock);
3719 
3720         list_for_each_safe(q, n, &list) {
3721                 t = list_entry(q, struct pktgen_thread, th_list);
3722                 list_del(&t->th_list);
3723                 kthread_stop(t->tsk);
3724                 kfree(t);
3725         }
3726 
3727         remove_proc_entry(PGCTRL, pn->proc_dir);
3728         remove_proc_entry(PG_PROC_DIR, pn->net->proc_net);
3729 }
3730 
3731 static struct pernet_operations pg_net_ops = {
3732         .init = pg_net_init,
3733         .exit = pg_net_exit,
3734         .id   = &pg_net_id,
3735         .size = sizeof(struct pktgen_net),
3736 };
3737 
3738 static int __init pg_init(void)
3739 {
3740         int ret = 0;
3741 
3742         pr_info("%s", version);
3743         ret = register_pernet_subsys(&pg_net_ops);
3744         if (ret)
3745                 return ret;
3746         ret = register_netdevice_notifier(&pktgen_notifier_block);
3747         if (ret)
3748                 unregister_pernet_subsys(&pg_net_ops);
3749 
3750         return ret;
3751 }
3752 
3753 static void __exit pg_cleanup(void)
3754 {
3755         unregister_netdevice_notifier(&pktgen_notifier_block);
3756         unregister_pernet_subsys(&pg_net_ops);
3757 }
3758 
3759 module_init(pg_init);
3760 module_exit(pg_cleanup);
3761 
3762 MODULE_AUTHOR("Robert Olsson <robert.olsson@its.uu.se>");
3763 MODULE_DESCRIPTION("Packet Generator tool");
3764 MODULE_LICENSE("GPL");
3765 MODULE_VERSION(VERSION);
3766 module_param(pg_count_d, int, 0);
3767 MODULE_PARM_DESC(pg_count_d, "Default number of packets to inject");
3768 module_param(pg_delay_d, int, 0);
3769 MODULE_PARM_DESC(pg_delay_d, "Default delay between packets (nanoseconds)");
3770 module_param(pg_clone_skb_d, int, 0);
3771 MODULE_PARM_DESC(pg_clone_skb_d, "Default number of copies of the same packet");
3772 module_param(debug, int, 0);
3773 MODULE_PARM_DESC(debug, "Enable debugging of pktgen module");
3774 

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