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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.
 73  * The if_list is RCU protected, and the if_lock remains to protect updating
 74  * of if_list, from "add_device" as it invoked from userspace (via proc write).
 75  *
 76  * By design there should only be *one* "controlling" process. In practice
 77  * multiple write accesses gives unpredictable result. Understood by "write"
 78  * to /proc gives result code thats should be read be the "writer".
 79  * For practical use this should be no problem.
 80  *
 81  * Note when adding devices to a specific CPU there good idea to also assign
 82  * /proc/irq/XX/smp_affinity so TX-interrupts gets bound to the same CPU.
 83  * --ro
 84  *
 85  * Fix refcount off by one if first packet fails, potential null deref,
 86  * memleak 030710- KJP
 87  *
 88  * First "ranges" functionality for ipv6 030726 --ro
 89  *
 90  * Included flow support. 030802 ANK.
 91  *
 92  * Fixed unaligned access on IA-64 Grant Grundler <grundler@parisc-linux.org>
 93  *
 94  * Remove if fix from added Harald Welte <laforge@netfilter.org> 040419
 95  * ia64 compilation fix from  Aron Griffis <aron@hp.com> 040604
 96  *
 97  * New xmit() return, do_div and misc clean up by Stephen Hemminger
 98  * <shemminger@osdl.org> 040923
 99  *
100  * Randy Dunlap fixed u64 printk compiler warning
101  *
102  * Remove FCS from BW calculation.  Lennert Buytenhek <buytenh@wantstofly.org>
103  * New time handling. Lennert Buytenhek <buytenh@wantstofly.org> 041213
104  *
105  * Corrections from Nikolai Malykh (nmalykh@bilim.com)
106  * Removed unused flags F_SET_SRCMAC & F_SET_SRCIP 041230
107  *
108  * interruptible_sleep_on_timeout() replaced Nishanth Aravamudan <nacc@us.ibm.com>
109  * 050103
110  *
111  * MPLS support by Steven Whitehouse <steve@chygwyn.com>
112  *
113  * 802.1Q/Q-in-Q support by Francesco Fondelli (FF) <francesco.fondelli@gmail.com>
114  *
115  * Fixed src_mac command to set source mac of packet to value specified in
116  * command by Adit Ranadive <adit.262@gmail.com>
117  *
118  */
119 
120 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
121 
122 #include <linux/sys.h>
123 #include <linux/types.h>
124 #include <linux/module.h>
125 #include <linux/moduleparam.h>
126 #include <linux/kernel.h>
127 #include <linux/mutex.h>
128 #include <linux/sched.h>
129 #include <linux/slab.h>
130 #include <linux/vmalloc.h>
131 #include <linux/unistd.h>
132 #include <linux/string.h>
133 #include <linux/ptrace.h>
134 #include <linux/errno.h>
135 #include <linux/ioport.h>
136 #include <linux/interrupt.h>
137 #include <linux/capability.h>
138 #include <linux/hrtimer.h>
139 #include <linux/freezer.h>
140 #include <linux/delay.h>
141 #include <linux/timer.h>
142 #include <linux/list.h>
143 #include <linux/init.h>
144 #include <linux/skbuff.h>
145 #include <linux/netdevice.h>
146 #include <linux/inet.h>
147 #include <linux/inetdevice.h>
148 #include <linux/rtnetlink.h>
149 #include <linux/if_arp.h>
150 #include <linux/if_vlan.h>
151 #include <linux/in.h>
152 #include <linux/ip.h>
153 #include <linux/ipv6.h>
154 #include <linux/udp.h>
155 #include <linux/proc_fs.h>
156 #include <linux/seq_file.h>
157 #include <linux/wait.h>
158 #include <linux/etherdevice.h>
159 #include <linux/kthread.h>
160 #include <linux/prefetch.h>
161 #include <net/net_namespace.h>
162 #include <net/checksum.h>
163 #include <net/ipv6.h>
164 #include <net/udp.h>
165 #include <net/ip6_checksum.h>
166 #include <net/addrconf.h>
167 #ifdef CONFIG_XFRM
168 #include <net/xfrm.h>
169 #endif
170 #include <net/netns/generic.h>
171 #include <asm/byteorder.h>
172 #include <linux/rcupdate.h>
173 #include <linux/bitops.h>
174 #include <linux/io.h>
175 #include <linux/timex.h>
176 #include <linux/uaccess.h>
177 #include <asm/dma.h>
178 #include <asm/div64.h>          /* do_div */
179 
180 #define VERSION "2.74"
181 #define IP_NAME_SZ 32
182 #define MAX_MPLS_LABELS 16 /* This is the max label stack depth */
183 #define MPLS_STACK_BOTTOM htonl(0x00000100)
184 
185 #define func_enter() pr_debug("entering %s\n", __func__);
186 
187 /* Device flag bits */
188 #define F_IPSRC_RND   (1<<0)    /* IP-Src Random  */
189 #define F_IPDST_RND   (1<<1)    /* IP-Dst Random  */
190 #define F_UDPSRC_RND  (1<<2)    /* UDP-Src Random */
191 #define F_UDPDST_RND  (1<<3)    /* UDP-Dst Random */
192 #define F_MACSRC_RND  (1<<4)    /* MAC-Src Random */
193 #define F_MACDST_RND  (1<<5)    /* MAC-Dst Random */
194 #define F_TXSIZE_RND  (1<<6)    /* Transmit size is random */
195 #define F_IPV6        (1<<7)    /* Interface in IPV6 Mode */
196 #define F_MPLS_RND    (1<<8)    /* Random MPLS labels */
197 #define F_VID_RND     (1<<9)    /* Random VLAN ID */
198 #define F_SVID_RND    (1<<10)   /* Random SVLAN ID */
199 #define F_FLOW_SEQ    (1<<11)   /* Sequential flows */
200 #define F_IPSEC_ON    (1<<12)   /* ipsec on for flows */
201 #define F_QUEUE_MAP_RND (1<<13) /* queue map Random */
202 #define F_QUEUE_MAP_CPU (1<<14) /* queue map mirrors smp_processor_id() */
203 #define F_NODE          (1<<15) /* Node memory alloc*/
204 #define F_UDPCSUM       (1<<16) /* Include UDP checksum */
205 #define F_NO_TIMESTAMP  (1<<17) /* Don't timestamp packets (default TS) */
206 
207 /* Thread control flag bits */
208 #define T_STOP        (1<<0)    /* Stop run */
209 #define T_RUN         (1<<1)    /* Start run */
210 #define T_REMDEVALL   (1<<2)    /* Remove all devs */
211 #define T_REMDEV      (1<<3)    /* Remove one dev */
212 
213 /* If lock -- protects updating of if_list */
214 #define   if_lock(t)           spin_lock(&(t->if_lock));
215 #define   if_unlock(t)           spin_unlock(&(t->if_lock));
216 
217 /* Used to help with determining the pkts on receive */
218 #define PKTGEN_MAGIC 0xbe9be955
219 #define PG_PROC_DIR "pktgen"
220 #define PGCTRL      "pgctrl"
221 
222 #define MAX_CFLOWS  65536
223 
224 #define VLAN_TAG_SIZE(x) ((x)->vlan_id == 0xffff ? 0 : 4)
225 #define SVLAN_TAG_SIZE(x) ((x)->svlan_id == 0xffff ? 0 : 4)
226 
227 struct flow_state {
228         __be32 cur_daddr;
229         int count;
230 #ifdef CONFIG_XFRM
231         struct xfrm_state *x;
232 #endif
233         __u32 flags;
234 };
235 
236 /* flow flag bits */
237 #define F_INIT   (1<<0)         /* flow has been initialized */
238 
239 struct pktgen_dev {
240         /*
241          * Try to keep frequent/infrequent used vars. separated.
242          */
243         struct proc_dir_entry *entry;   /* proc file */
244         struct pktgen_thread *pg_thread;/* the owner */
245         struct list_head list;          /* chaining in the thread's run-queue */
246         struct rcu_head  rcu;           /* freed by RCU */
247 
248         int running;            /* if false, the test will stop */
249 
250         /* If min != max, then we will either do a linear iteration, or
251          * we will do a random selection from within the range.
252          */
253         __u32 flags;
254         int removal_mark;       /* non-zero => the device is marked for
255                                  * removal by worker thread */
256 
257         int min_pkt_size;
258         int max_pkt_size;
259         int pkt_overhead;       /* overhead for MPLS, VLANs, IPSEC etc */
260         int nfrags;
261         struct page *page;
262         u64 delay;              /* nano-seconds */
263 
264         __u64 count;            /* Default No packets to send */
265         __u64 sofar;            /* How many pkts we've sent so far */
266         __u64 tx_bytes;         /* How many bytes we've transmitted */
267         __u64 errors;           /* Errors when trying to transmit, */
268 
269         /* runtime counters relating to clone_skb */
270 
271         __u64 allocated_skbs;
272         __u32 clone_count;
273         int last_ok;            /* Was last skb sent?
274                                  * Or a failed transmit of some sort?
275                                  * This will keep sequence numbers in order
276                                  */
277         ktime_t next_tx;
278         ktime_t started_at;
279         ktime_t stopped_at;
280         u64     idle_acc;       /* nano-seconds */
281 
282         __u32 seq_num;
283 
284         int clone_skb;          /*
285                                  * Use multiple SKBs during packet gen.
286                                  * If this number is greater than 1, then
287                                  * that many copies of the same packet will be
288                                  * sent before a new packet is allocated.
289                                  * If you want to send 1024 identical packets
290                                  * before creating a new packet,
291                                  * set clone_skb to 1024.
292                                  */
293 
294         char dst_min[IP_NAME_SZ];       /* IP, ie 1.2.3.4 */
295         char dst_max[IP_NAME_SZ];       /* IP, ie 1.2.3.4 */
296         char src_min[IP_NAME_SZ];       /* IP, ie 1.2.3.4 */
297         char src_max[IP_NAME_SZ];       /* IP, ie 1.2.3.4 */
298 
299         struct in6_addr in6_saddr;
300         struct in6_addr in6_daddr;
301         struct in6_addr cur_in6_daddr;
302         struct in6_addr cur_in6_saddr;
303         /* For ranges */
304         struct in6_addr min_in6_daddr;
305         struct in6_addr max_in6_daddr;
306         struct in6_addr min_in6_saddr;
307         struct in6_addr max_in6_saddr;
308 
309         /* If we're doing ranges, random or incremental, then this
310          * defines the min/max for those ranges.
311          */
312         __be32 saddr_min;       /* inclusive, source IP address */
313         __be32 saddr_max;       /* exclusive, source IP address */
314         __be32 daddr_min;       /* inclusive, dest IP address */
315         __be32 daddr_max;       /* exclusive, dest IP address */
316 
317         __u16 udp_src_min;      /* inclusive, source UDP port */
318         __u16 udp_src_max;      /* exclusive, source UDP port */
319         __u16 udp_dst_min;      /* inclusive, dest UDP port */
320         __u16 udp_dst_max;      /* exclusive, dest UDP port */
321 
322         /* DSCP + ECN */
323         __u8 tos;            /* six MSB of (former) IPv4 TOS
324                                 are for dscp codepoint */
325         __u8 traffic_class;  /* ditto for the (former) Traffic Class in IPv6
326                                 (see RFC 3260, sec. 4) */
327 
328         /* MPLS */
329         unsigned int nr_labels; /* Depth of stack, 0 = no MPLS */
330         __be32 labels[MAX_MPLS_LABELS];
331 
332         /* VLAN/SVLAN (802.1Q/Q-in-Q) */
333         __u8  vlan_p;
334         __u8  vlan_cfi;
335         __u16 vlan_id;  /* 0xffff means no vlan tag */
336 
337         __u8  svlan_p;
338         __u8  svlan_cfi;
339         __u16 svlan_id; /* 0xffff means no svlan tag */
340 
341         __u32 src_mac_count;    /* How many MACs to iterate through */
342         __u32 dst_mac_count;    /* How many MACs to iterate through */
343 
344         unsigned char dst_mac[ETH_ALEN];
345         unsigned char src_mac[ETH_ALEN];
346 
347         __u32 cur_dst_mac_offset;
348         __u32 cur_src_mac_offset;
349         __be32 cur_saddr;
350         __be32 cur_daddr;
351         __u16 ip_id;
352         __u16 cur_udp_dst;
353         __u16 cur_udp_src;
354         __u16 cur_queue_map;
355         __u32 cur_pkt_size;
356         __u32 last_pkt_size;
357 
358         __u8 hh[14];
359         /* = {
360            0x00, 0x80, 0xC8, 0x79, 0xB3, 0xCB,
361 
362            We fill in SRC address later
363            0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
364            0x08, 0x00
365            };
366          */
367         __u16 pad;              /* pad out the hh struct to an even 16 bytes */
368 
369         struct sk_buff *skb;    /* skb we are to transmit next, used for when we
370                                  * are transmitting the same one multiple times
371                                  */
372         struct net_device *odev; /* The out-going device.
373                                   * Note that the device should have it's
374                                   * pg_info pointer pointing back to this
375                                   * device.
376                                   * Set when the user specifies the out-going
377                                   * device name (not when the inject is
378                                   * started as it used to do.)
379                                   */
380         char odevname[32];
381         struct flow_state *flows;
382         unsigned int cflows;    /* Concurrent flows (config) */
383         unsigned int lflow;             /* Flow length  (config) */
384         unsigned int nflows;    /* accumulated flows (stats) */
385         unsigned int curfl;             /* current sequenced flow (state)*/
386 
387         u16 queue_map_min;
388         u16 queue_map_max;
389         __u32 skb_priority;     /* skb priority field */
390         unsigned int burst;     /* number of duplicated packets to burst */
391         int node;               /* Memory node */
392 
393 #ifdef CONFIG_XFRM
394         __u8    ipsmode;                /* IPSEC mode (config) */
395         __u8    ipsproto;               /* IPSEC type (config) */
396         __u32   spi;
397         struct dst_entry dst;
398         struct dst_ops dstops;
399 #endif
400         char result[512];
401 };
402 
403 struct pktgen_hdr {
404         __be32 pgh_magic;
405         __be32 seq_num;
406         __be32 tv_sec;
407         __be32 tv_usec;
408 };
409 
410 
411 static int pg_net_id __read_mostly;
412 
413 struct pktgen_net {
414         struct net              *net;
415         struct proc_dir_entry   *proc_dir;
416         struct list_head        pktgen_threads;
417         bool                    pktgen_exiting;
418 };
419 
420 struct pktgen_thread {
421         spinlock_t if_lock;             /* for list of devices */
422         struct list_head if_list;       /* All device here */
423         struct list_head th_list;
424         struct task_struct *tsk;
425         char result[512];
426 
427         /* Field for thread to receive "posted" events terminate,
428            stop ifs etc. */
429 
430         u32 control;
431         int cpu;
432 
433         wait_queue_head_t queue;
434         struct completion start_done;
435         struct pktgen_net *net;
436 };
437 
438 #define REMOVE 1
439 #define FIND   0
440 
441 static const char version[] =
442         "Packet Generator for packet performance testing. "
443         "Version: " VERSION "\n";
444 
445 static int pktgen_remove_device(struct pktgen_thread *t, struct pktgen_dev *i);
446 static int pktgen_add_device(struct pktgen_thread *t, const char *ifname);
447 static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t,
448                                           const char *ifname, bool exact);
449 static int pktgen_device_event(struct notifier_block *, unsigned long, void *);
450 static void pktgen_run_all_threads(struct pktgen_net *pn);
451 static void pktgen_reset_all_threads(struct pktgen_net *pn);
452 static void pktgen_stop_all_threads_ifs(struct pktgen_net *pn);
453 
454 static void pktgen_stop(struct pktgen_thread *t);
455 static void pktgen_clear_counters(struct pktgen_dev *pkt_dev);
456 
457 /* Module parameters, defaults. */
458 static int pg_count_d __read_mostly = 1000;
459 static int pg_delay_d __read_mostly;
460 static int pg_clone_skb_d  __read_mostly;
461 static int debug  __read_mostly;
462 
463 static DEFINE_MUTEX(pktgen_thread_lock);
464 
465 static struct notifier_block pktgen_notifier_block = {
466         .notifier_call = pktgen_device_event,
467 };
468 
469 /*
470  * /proc handling functions
471  *
472  */
473 
474 static int pgctrl_show(struct seq_file *seq, void *v)
475 {
476         seq_puts(seq, version);
477         return 0;
478 }
479 
480 static ssize_t pgctrl_write(struct file *file, const char __user *buf,
481                             size_t count, loff_t *ppos)
482 {
483         char data[128];
484         struct pktgen_net *pn = net_generic(current->nsproxy->net_ns, pg_net_id);
485 
486         if (!capable(CAP_NET_ADMIN))
487                 return -EPERM;
488 
489         if (count == 0)
490                 return -EINVAL;
491 
492         if (count > sizeof(data))
493                 count = sizeof(data);
494 
495         if (copy_from_user(data, buf, count))
496                 return -EFAULT;
497 
498         data[count - 1] = 0;    /* Strip trailing '\n' and terminate string */
499 
500         if (!strcmp(data, "stop"))
501                 pktgen_stop_all_threads_ifs(pn);
502 
503         else if (!strcmp(data, "start"))
504                 pktgen_run_all_threads(pn);
505 
506         else if (!strcmp(data, "reset"))
507                 pktgen_reset_all_threads(pn);
508 
509         else
510                 pr_warn("Unknown command: %s\n", data);
511 
512         return count;
513 }
514 
515 static int pgctrl_open(struct inode *inode, struct file *file)
516 {
517         return single_open(file, pgctrl_show, PDE_DATA(inode));
518 }
519 
520 static const struct file_operations pktgen_fops = {
521         .owner   = THIS_MODULE,
522         .open    = pgctrl_open,
523         .read    = seq_read,
524         .llseek  = seq_lseek,
525         .write   = pgctrl_write,
526         .release = single_release,
527 };
528 
529 static int pktgen_if_show(struct seq_file *seq, void *v)
530 {
531         const struct pktgen_dev *pkt_dev = seq->private;
532         ktime_t stopped;
533         u64 idle;
534 
535         seq_printf(seq,
536                    "Params: count %llu  min_pkt_size: %u  max_pkt_size: %u\n",
537                    (unsigned long long)pkt_dev->count, pkt_dev->min_pkt_size,
538                    pkt_dev->max_pkt_size);
539 
540         seq_printf(seq,
541                    "     frags: %d  delay: %llu  clone_skb: %d  ifname: %s\n",
542                    pkt_dev->nfrags, (unsigned long long) pkt_dev->delay,
543                    pkt_dev->clone_skb, pkt_dev->odevname);
544 
545         seq_printf(seq, "     flows: %u flowlen: %u\n", pkt_dev->cflows,
546                    pkt_dev->lflow);
547 
548         seq_printf(seq,
549                    "     queue_map_min: %u  queue_map_max: %u\n",
550                    pkt_dev->queue_map_min,
551                    pkt_dev->queue_map_max);
552 
553         if (pkt_dev->skb_priority)
554                 seq_printf(seq, "     skb_priority: %u\n",
555                            pkt_dev->skb_priority);
556 
557         if (pkt_dev->flags & F_IPV6) {
558                 seq_printf(seq,
559                            "     saddr: %pI6c  min_saddr: %pI6c  max_saddr: %pI6c\n"
560                            "     daddr: %pI6c  min_daddr: %pI6c  max_daddr: %pI6c\n",
561                            &pkt_dev->in6_saddr,
562                            &pkt_dev->min_in6_saddr, &pkt_dev->max_in6_saddr,
563                            &pkt_dev->in6_daddr,
564                            &pkt_dev->min_in6_daddr, &pkt_dev->max_in6_daddr);
565         } else {
566                 seq_printf(seq,
567                            "     dst_min: %s  dst_max: %s\n",
568                            pkt_dev->dst_min, pkt_dev->dst_max);
569                 seq_printf(seq,
570                            "        src_min: %s  src_max: %s\n",
571                            pkt_dev->src_min, pkt_dev->src_max);
572         }
573 
574         seq_puts(seq, "     src_mac: ");
575 
576         seq_printf(seq, "%pM ",
577                    is_zero_ether_addr(pkt_dev->src_mac) ?
578                              pkt_dev->odev->dev_addr : pkt_dev->src_mac);
579 
580         seq_puts(seq, "dst_mac: ");
581         seq_printf(seq, "%pM\n", pkt_dev->dst_mac);
582 
583         seq_printf(seq,
584                    "     udp_src_min: %d  udp_src_max: %d"
585                    "  udp_dst_min: %d  udp_dst_max: %d\n",
586                    pkt_dev->udp_src_min, pkt_dev->udp_src_max,
587                    pkt_dev->udp_dst_min, pkt_dev->udp_dst_max);
588 
589         seq_printf(seq,
590                    "     src_mac_count: %d  dst_mac_count: %d\n",
591                    pkt_dev->src_mac_count, pkt_dev->dst_mac_count);
592 
593         if (pkt_dev->nr_labels) {
594                 unsigned int i;
595                 seq_puts(seq, "     mpls: ");
596                 for (i = 0; i < pkt_dev->nr_labels; i++)
597                         seq_printf(seq, "%08x%s", ntohl(pkt_dev->labels[i]),
598                                    i == pkt_dev->nr_labels-1 ? "\n" : ", ");
599         }
600 
601         if (pkt_dev->vlan_id != 0xffff)
602                 seq_printf(seq, "     vlan_id: %u  vlan_p: %u  vlan_cfi: %u\n",
603                            pkt_dev->vlan_id, pkt_dev->vlan_p,
604                            pkt_dev->vlan_cfi);
605 
606         if (pkt_dev->svlan_id != 0xffff)
607                 seq_printf(seq, "     svlan_id: %u  vlan_p: %u  vlan_cfi: %u\n",
608                            pkt_dev->svlan_id, pkt_dev->svlan_p,
609                            pkt_dev->svlan_cfi);
610 
611         if (pkt_dev->tos)
612                 seq_printf(seq, "     tos: 0x%02x\n", pkt_dev->tos);
613 
614         if (pkt_dev->traffic_class)
615                 seq_printf(seq, "     traffic_class: 0x%02x\n", pkt_dev->traffic_class);
616 
617         if (pkt_dev->burst > 1)
618                 seq_printf(seq, "     burst: %d\n", pkt_dev->burst);
619 
620         if (pkt_dev->node >= 0)
621                 seq_printf(seq, "     node: %d\n", pkt_dev->node);
622 
623         seq_puts(seq, "     Flags: ");
624 
625         if (pkt_dev->flags & F_IPV6)
626                 seq_puts(seq, "IPV6  ");
627 
628         if (pkt_dev->flags & F_IPSRC_RND)
629                 seq_puts(seq, "IPSRC_RND  ");
630 
631         if (pkt_dev->flags & F_IPDST_RND)
632                 seq_puts(seq, "IPDST_RND  ");
633 
634         if (pkt_dev->flags & F_TXSIZE_RND)
635                 seq_puts(seq, "TXSIZE_RND  ");
636 
637         if (pkt_dev->flags & F_UDPSRC_RND)
638                 seq_puts(seq, "UDPSRC_RND  ");
639 
640         if (pkt_dev->flags & F_UDPDST_RND)
641                 seq_puts(seq, "UDPDST_RND  ");
642 
643         if (pkt_dev->flags & F_UDPCSUM)
644                 seq_puts(seq, "UDPCSUM  ");
645 
646         if (pkt_dev->flags & F_NO_TIMESTAMP)
647                 seq_puts(seq, "NO_TIMESTAMP  ");
648 
649         if (pkt_dev->flags & F_MPLS_RND)
650                 seq_puts(seq,  "MPLS_RND  ");
651 
652         if (pkt_dev->flags & F_QUEUE_MAP_RND)
653                 seq_puts(seq,  "QUEUE_MAP_RND  ");
654 
655         if (pkt_dev->flags & F_QUEUE_MAP_CPU)
656                 seq_puts(seq,  "QUEUE_MAP_CPU  ");
657 
658         if (pkt_dev->cflows) {
659                 if (pkt_dev->flags & F_FLOW_SEQ)
660                         seq_puts(seq,  "FLOW_SEQ  "); /*in sequence flows*/
661                 else
662                         seq_puts(seq,  "FLOW_RND  ");
663         }
664 
665 #ifdef CONFIG_XFRM
666         if (pkt_dev->flags & F_IPSEC_ON) {
667                 seq_puts(seq,  "IPSEC  ");
668                 if (pkt_dev->spi)
669                         seq_printf(seq, "spi:%u", pkt_dev->spi);
670         }
671 #endif
672 
673         if (pkt_dev->flags & F_MACSRC_RND)
674                 seq_puts(seq, "MACSRC_RND  ");
675 
676         if (pkt_dev->flags & F_MACDST_RND)
677                 seq_puts(seq, "MACDST_RND  ");
678 
679         if (pkt_dev->flags & F_VID_RND)
680                 seq_puts(seq, "VID_RND  ");
681 
682         if (pkt_dev->flags & F_SVID_RND)
683                 seq_puts(seq, "SVID_RND  ");
684 
685         if (pkt_dev->flags & F_NODE)
686                 seq_puts(seq, "NODE_ALLOC  ");
687 
688         seq_puts(seq, "\n");
689 
690         /* not really stopped, more like last-running-at */
691         stopped = pkt_dev->running ? ktime_get() : pkt_dev->stopped_at;
692         idle = pkt_dev->idle_acc;
693         do_div(idle, NSEC_PER_USEC);
694 
695         seq_printf(seq,
696                    "Current:\n     pkts-sofar: %llu  errors: %llu\n",
697                    (unsigned long long)pkt_dev->sofar,
698                    (unsigned long long)pkt_dev->errors);
699 
700         seq_printf(seq,
701                    "     started: %lluus  stopped: %lluus idle: %lluus\n",
702                    (unsigned long long) ktime_to_us(pkt_dev->started_at),
703                    (unsigned long long) ktime_to_us(stopped),
704                    (unsigned long long) idle);
705 
706         seq_printf(seq,
707                    "     seq_num: %d  cur_dst_mac_offset: %d  cur_src_mac_offset: %d\n",
708                    pkt_dev->seq_num, pkt_dev->cur_dst_mac_offset,
709                    pkt_dev->cur_src_mac_offset);
710 
711         if (pkt_dev->flags & F_IPV6) {
712                 seq_printf(seq, "     cur_saddr: %pI6c  cur_daddr: %pI6c\n",
713                                 &pkt_dev->cur_in6_saddr,
714                                 &pkt_dev->cur_in6_daddr);
715         } else
716                 seq_printf(seq, "     cur_saddr: %pI4  cur_daddr: %pI4\n",
717                            &pkt_dev->cur_saddr, &pkt_dev->cur_daddr);
718 
719         seq_printf(seq, "     cur_udp_dst: %d  cur_udp_src: %d\n",
720                    pkt_dev->cur_udp_dst, pkt_dev->cur_udp_src);
721 
722         seq_printf(seq, "     cur_queue_map: %u\n", pkt_dev->cur_queue_map);
723 
724         seq_printf(seq, "     flows: %u\n", pkt_dev->nflows);
725 
726         if (pkt_dev->result[0])
727                 seq_printf(seq, "Result: %s\n", pkt_dev->result);
728         else
729                 seq_puts(seq, "Result: Idle\n");
730 
731         return 0;
732 }
733 
734 
735 static int hex32_arg(const char __user *user_buffer, unsigned long maxlen,
736                      __u32 *num)
737 {
738         int i = 0;
739         *num = 0;
740 
741         for (; i < maxlen; i++) {
742                 int value;
743                 char c;
744                 *num <<= 4;
745                 if (get_user(c, &user_buffer[i]))
746                         return -EFAULT;
747                 value = hex_to_bin(c);
748                 if (value >= 0)
749                         *num |= value;
750                 else
751                         break;
752         }
753         return i;
754 }
755 
756 static int count_trail_chars(const char __user * user_buffer,
757                              unsigned int maxlen)
758 {
759         int i;
760 
761         for (i = 0; i < maxlen; i++) {
762                 char c;
763                 if (get_user(c, &user_buffer[i]))
764                         return -EFAULT;
765                 switch (c) {
766                 case '\"':
767                 case '\n':
768                 case '\r':
769                 case '\t':
770                 case ' ':
771                 case '=':
772                         break;
773                 default:
774                         goto done;
775                 }
776         }
777 done:
778         return i;
779 }
780 
781 static long num_arg(const char __user *user_buffer, unsigned long maxlen,
782                                 unsigned long *num)
783 {
784         int i;
785         *num = 0;
786 
787         for (i = 0; i < maxlen; i++) {
788                 char c;
789                 if (get_user(c, &user_buffer[i]))
790                         return -EFAULT;
791                 if ((c >= '') && (c <= '9')) {
792                         *num *= 10;
793                         *num += c - '';
794                 } else
795                         break;
796         }
797         return i;
798 }
799 
800 static int strn_len(const char __user * user_buffer, unsigned int maxlen)
801 {
802         int i;
803 
804         for (i = 0; i < maxlen; i++) {
805                 char c;
806                 if (get_user(c, &user_buffer[i]))
807                         return -EFAULT;
808                 switch (c) {
809                 case '\"':
810                 case '\n':
811                 case '\r':
812                 case '\t':
813                 case ' ':
814                         goto done_str;
815                 default:
816                         break;
817                 }
818         }
819 done_str:
820         return i;
821 }
822 
823 static ssize_t get_labels(const char __user *buffer, struct pktgen_dev *pkt_dev)
824 {
825         unsigned int n = 0;
826         char c;
827         ssize_t i = 0;
828         int len;
829 
830         pkt_dev->nr_labels = 0;
831         do {
832                 __u32 tmp;
833                 len = hex32_arg(&buffer[i], 8, &tmp);
834                 if (len <= 0)
835                         return len;
836                 pkt_dev->labels[n] = htonl(tmp);
837                 if (pkt_dev->labels[n] & MPLS_STACK_BOTTOM)
838                         pkt_dev->flags |= F_MPLS_RND;
839                 i += len;
840                 if (get_user(c, &buffer[i]))
841                         return -EFAULT;
842                 i++;
843                 n++;
844                 if (n >= MAX_MPLS_LABELS)
845                         return -E2BIG;
846         } while (c == ',');
847 
848         pkt_dev->nr_labels = n;
849         return i;
850 }
851 
852 static ssize_t pktgen_if_write(struct file *file,
853                                const char __user * user_buffer, size_t count,
854                                loff_t * offset)
855 {
856         struct seq_file *seq = file->private_data;
857         struct pktgen_dev *pkt_dev = seq->private;
858         int i, max, len;
859         char name[16], valstr[32];
860         unsigned long value = 0;
861         char *pg_result = NULL;
862         int tmp = 0;
863         char buf[128];
864 
865         pg_result = &(pkt_dev->result[0]);
866 
867         if (count < 1) {
868                 pr_warn("wrong command format\n");
869                 return -EINVAL;
870         }
871 
872         max = count;
873         tmp = count_trail_chars(user_buffer, max);
874         if (tmp < 0) {
875                 pr_warn("illegal format\n");
876                 return tmp;
877         }
878         i = tmp;
879 
880         /* Read variable name */
881 
882         len = strn_len(&user_buffer[i], sizeof(name) - 1);
883         if (len < 0)
884                 return len;
885 
886         memset(name, 0, sizeof(name));
887         if (copy_from_user(name, &user_buffer[i], len))
888                 return -EFAULT;
889         i += len;
890 
891         max = count - i;
892         len = count_trail_chars(&user_buffer[i], max);
893         if (len < 0)
894                 return len;
895 
896         i += len;
897 
898         if (debug) {
899                 size_t copy = min_t(size_t, count, 1023);
900                 char tb[copy + 1];
901                 if (copy_from_user(tb, user_buffer, copy))
902                         return -EFAULT;
903                 tb[copy] = 0;
904                 pr_debug("%s,%lu  buffer -:%s:-\n",
905                          name, (unsigned long)count, tb);
906         }
907 
908         if (!strcmp(name, "min_pkt_size")) {
909                 len = num_arg(&user_buffer[i], 10, &value);
910                 if (len < 0)
911                         return len;
912 
913                 i += len;
914                 if (value < 14 + 20 + 8)
915                         value = 14 + 20 + 8;
916                 if (value != pkt_dev->min_pkt_size) {
917                         pkt_dev->min_pkt_size = value;
918                         pkt_dev->cur_pkt_size = value;
919                 }
920                 sprintf(pg_result, "OK: min_pkt_size=%u",
921                         pkt_dev->min_pkt_size);
922                 return count;
923         }
924 
925         if (!strcmp(name, "max_pkt_size")) {
926                 len = num_arg(&user_buffer[i], 10, &value);
927                 if (len < 0)
928                         return len;
929 
930                 i += len;
931                 if (value < 14 + 20 + 8)
932                         value = 14 + 20 + 8;
933                 if (value != pkt_dev->max_pkt_size) {
934                         pkt_dev->max_pkt_size = value;
935                         pkt_dev->cur_pkt_size = value;
936                 }
937                 sprintf(pg_result, "OK: max_pkt_size=%u",
938                         pkt_dev->max_pkt_size);
939                 return count;
940         }
941 
942         /* Shortcut for min = max */
943 
944         if (!strcmp(name, "pkt_size")) {
945                 len = num_arg(&user_buffer[i], 10, &value);
946                 if (len < 0)
947                         return len;
948 
949                 i += len;
950                 if (value < 14 + 20 + 8)
951                         value = 14 + 20 + 8;
952                 if (value != pkt_dev->min_pkt_size) {
953                         pkt_dev->min_pkt_size = value;
954                         pkt_dev->max_pkt_size = value;
955                         pkt_dev->cur_pkt_size = value;
956                 }
957                 sprintf(pg_result, "OK: pkt_size=%u", pkt_dev->min_pkt_size);
958                 return count;
959         }
960 
961         if (!strcmp(name, "debug")) {
962                 len = num_arg(&user_buffer[i], 10, &value);
963                 if (len < 0)
964                         return len;
965 
966                 i += len;
967                 debug = value;
968                 sprintf(pg_result, "OK: debug=%u", debug);
969                 return count;
970         }
971 
972         if (!strcmp(name, "frags")) {
973                 len = num_arg(&user_buffer[i], 10, &value);
974                 if (len < 0)
975                         return len;
976 
977                 i += len;
978                 pkt_dev->nfrags = value;
979                 sprintf(pg_result, "OK: frags=%u", pkt_dev->nfrags);
980                 return count;
981         }
982         if (!strcmp(name, "delay")) {
983                 len = num_arg(&user_buffer[i], 10, &value);
984                 if (len < 0)
985                         return len;
986 
987                 i += len;
988                 if (value == 0x7FFFFFFF)
989                         pkt_dev->delay = ULLONG_MAX;
990                 else
991                         pkt_dev->delay = (u64)value;
992 
993                 sprintf(pg_result, "OK: delay=%llu",
994                         (unsigned long long) pkt_dev->delay);
995                 return count;
996         }
997         if (!strcmp(name, "rate")) {
998                 len = num_arg(&user_buffer[i], 10, &value);
999                 if (len < 0)
1000                         return len;
1001 
1002                 i += len;
1003                 if (!value)
1004                         return len;
1005                 pkt_dev->delay = pkt_dev->min_pkt_size*8*NSEC_PER_USEC/value;
1006                 if (debug)
1007                         pr_info("Delay set at: %llu ns\n", pkt_dev->delay);
1008 
1009                 sprintf(pg_result, "OK: rate=%lu", value);
1010                 return count;
1011         }
1012         if (!strcmp(name, "ratep")) {
1013                 len = num_arg(&user_buffer[i], 10, &value);
1014                 if (len < 0)
1015                         return len;
1016 
1017                 i += len;
1018                 if (!value)
1019                         return len;
1020                 pkt_dev->delay = NSEC_PER_SEC/value;
1021                 if (debug)
1022                         pr_info("Delay set at: %llu ns\n", pkt_dev->delay);
1023 
1024                 sprintf(pg_result, "OK: rate=%lu", value);
1025                 return count;
1026         }
1027         if (!strcmp(name, "udp_src_min")) {
1028                 len = num_arg(&user_buffer[i], 10, &value);
1029                 if (len < 0)
1030                         return len;
1031 
1032                 i += len;
1033                 if (value != pkt_dev->udp_src_min) {
1034                         pkt_dev->udp_src_min = value;
1035                         pkt_dev->cur_udp_src = value;
1036                 }
1037                 sprintf(pg_result, "OK: udp_src_min=%u", pkt_dev->udp_src_min);
1038                 return count;
1039         }
1040         if (!strcmp(name, "udp_dst_min")) {
1041                 len = num_arg(&user_buffer[i], 10, &value);
1042                 if (len < 0)
1043                         return len;
1044 
1045                 i += len;
1046                 if (value != pkt_dev->udp_dst_min) {
1047                         pkt_dev->udp_dst_min = value;
1048                         pkt_dev->cur_udp_dst = value;
1049                 }
1050                 sprintf(pg_result, "OK: udp_dst_min=%u", pkt_dev->udp_dst_min);
1051                 return count;
1052         }
1053         if (!strcmp(name, "udp_src_max")) {
1054                 len = num_arg(&user_buffer[i], 10, &value);
1055                 if (len < 0)
1056                         return len;
1057 
1058                 i += len;
1059                 if (value != pkt_dev->udp_src_max) {
1060                         pkt_dev->udp_src_max = value;
1061                         pkt_dev->cur_udp_src = value;
1062                 }
1063                 sprintf(pg_result, "OK: udp_src_max=%u", pkt_dev->udp_src_max);
1064                 return count;
1065         }
1066         if (!strcmp(name, "udp_dst_max")) {
1067                 len = num_arg(&user_buffer[i], 10, &value);
1068                 if (len < 0)
1069                         return len;
1070 
1071                 i += len;
1072                 if (value != pkt_dev->udp_dst_max) {
1073                         pkt_dev->udp_dst_max = value;
1074                         pkt_dev->cur_udp_dst = value;
1075                 }
1076                 sprintf(pg_result, "OK: udp_dst_max=%u", pkt_dev->udp_dst_max);
1077                 return count;
1078         }
1079         if (!strcmp(name, "clone_skb")) {
1080                 len = num_arg(&user_buffer[i], 10, &value);
1081                 if (len < 0)
1082                         return len;
1083                 if ((value > 0) &&
1084                     (!(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)))
1085                         return -ENOTSUPP;
1086                 i += len;
1087                 pkt_dev->clone_skb = value;
1088 
1089                 sprintf(pg_result, "OK: clone_skb=%d", pkt_dev->clone_skb);
1090                 return count;
1091         }
1092         if (!strcmp(name, "count")) {
1093                 len = num_arg(&user_buffer[i], 10, &value);
1094                 if (len < 0)
1095                         return len;
1096 
1097                 i += len;
1098                 pkt_dev->count = value;
1099                 sprintf(pg_result, "OK: count=%llu",
1100                         (unsigned long long)pkt_dev->count);
1101                 return count;
1102         }
1103         if (!strcmp(name, "src_mac_count")) {
1104                 len = num_arg(&user_buffer[i], 10, &value);
1105                 if (len < 0)
1106                         return len;
1107 
1108                 i += len;
1109                 if (pkt_dev->src_mac_count != value) {
1110                         pkt_dev->src_mac_count = value;
1111                         pkt_dev->cur_src_mac_offset = 0;
1112                 }
1113                 sprintf(pg_result, "OK: src_mac_count=%d",
1114                         pkt_dev->src_mac_count);
1115                 return count;
1116         }
1117         if (!strcmp(name, "dst_mac_count")) {
1118                 len = num_arg(&user_buffer[i], 10, &value);
1119                 if (len < 0)
1120                         return len;
1121 
1122                 i += len;
1123                 if (pkt_dev->dst_mac_count != value) {
1124                         pkt_dev->dst_mac_count = value;
1125                         pkt_dev->cur_dst_mac_offset = 0;
1126                 }
1127                 sprintf(pg_result, "OK: dst_mac_count=%d",
1128                         pkt_dev->dst_mac_count);
1129                 return count;
1130         }
1131         if (!strcmp(name, "burst")) {
1132                 len = num_arg(&user_buffer[i], 10, &value);
1133                 if (len < 0)
1134                         return len;
1135 
1136                 i += len;
1137                 if ((value > 1) &&
1138                     (!(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)))
1139                         return -ENOTSUPP;
1140                 pkt_dev->burst = value < 1 ? 1 : value;
1141                 sprintf(pg_result, "OK: burst=%d", pkt_dev->burst);
1142                 return count;
1143         }
1144         if (!strcmp(name, "node")) {
1145                 len = num_arg(&user_buffer[i], 10, &value);
1146                 if (len < 0)
1147                         return len;
1148 
1149                 i += len;
1150 
1151                 if (node_possible(value)) {
1152                         pkt_dev->node = value;
1153                         sprintf(pg_result, "OK: node=%d", pkt_dev->node);
1154                         if (pkt_dev->page) {
1155                                 put_page(pkt_dev->page);
1156                                 pkt_dev->page = NULL;
1157                         }
1158                 }
1159                 else
1160                         sprintf(pg_result, "ERROR: node not possible");
1161                 return count;
1162         }
1163         if (!strcmp(name, "flag")) {
1164                 char f[32];
1165                 memset(f, 0, 32);
1166                 len = strn_len(&user_buffer[i], sizeof(f) - 1);
1167                 if (len < 0)
1168                         return len;
1169 
1170                 if (copy_from_user(f, &user_buffer[i], len))
1171                         return -EFAULT;
1172                 i += len;
1173                 if (strcmp(f, "IPSRC_RND") == 0)
1174                         pkt_dev->flags |= F_IPSRC_RND;
1175 
1176                 else if (strcmp(f, "!IPSRC_RND") == 0)
1177                         pkt_dev->flags &= ~F_IPSRC_RND;
1178 
1179                 else if (strcmp(f, "TXSIZE_RND") == 0)
1180                         pkt_dev->flags |= F_TXSIZE_RND;
1181 
1182                 else if (strcmp(f, "!TXSIZE_RND") == 0)
1183                         pkt_dev->flags &= ~F_TXSIZE_RND;
1184 
1185                 else if (strcmp(f, "IPDST_RND") == 0)
1186                         pkt_dev->flags |= F_IPDST_RND;
1187 
1188                 else if (strcmp(f, "!IPDST_RND") == 0)
1189                         pkt_dev->flags &= ~F_IPDST_RND;
1190 
1191                 else if (strcmp(f, "UDPSRC_RND") == 0)
1192                         pkt_dev->flags |= F_UDPSRC_RND;
1193 
1194                 else if (strcmp(f, "!UDPSRC_RND") == 0)
1195                         pkt_dev->flags &= ~F_UDPSRC_RND;
1196 
1197                 else if (strcmp(f, "UDPDST_RND") == 0)
1198                         pkt_dev->flags |= F_UDPDST_RND;
1199 
1200                 else if (strcmp(f, "!UDPDST_RND") == 0)
1201                         pkt_dev->flags &= ~F_UDPDST_RND;
1202 
1203                 else if (strcmp(f, "MACSRC_RND") == 0)
1204                         pkt_dev->flags |= F_MACSRC_RND;
1205 
1206                 else if (strcmp(f, "!MACSRC_RND") == 0)
1207                         pkt_dev->flags &= ~F_MACSRC_RND;
1208 
1209                 else if (strcmp(f, "MACDST_RND") == 0)
1210                         pkt_dev->flags |= F_MACDST_RND;
1211 
1212                 else if (strcmp(f, "!MACDST_RND") == 0)
1213                         pkt_dev->flags &= ~F_MACDST_RND;
1214 
1215                 else if (strcmp(f, "MPLS_RND") == 0)
1216                         pkt_dev->flags |= F_MPLS_RND;
1217 
1218                 else if (strcmp(f, "!MPLS_RND") == 0)
1219                         pkt_dev->flags &= ~F_MPLS_RND;
1220 
1221                 else if (strcmp(f, "VID_RND") == 0)
1222                         pkt_dev->flags |= F_VID_RND;
1223 
1224                 else if (strcmp(f, "!VID_RND") == 0)
1225                         pkt_dev->flags &= ~F_VID_RND;
1226 
1227                 else if (strcmp(f, "SVID_RND") == 0)
1228                         pkt_dev->flags |= F_SVID_RND;
1229 
1230                 else if (strcmp(f, "!SVID_RND") == 0)
1231                         pkt_dev->flags &= ~F_SVID_RND;
1232 
1233                 else if (strcmp(f, "FLOW_SEQ") == 0)
1234                         pkt_dev->flags |= F_FLOW_SEQ;
1235 
1236                 else if (strcmp(f, "QUEUE_MAP_RND") == 0)
1237                         pkt_dev->flags |= F_QUEUE_MAP_RND;
1238 
1239                 else if (strcmp(f, "!QUEUE_MAP_RND") == 0)
1240                         pkt_dev->flags &= ~F_QUEUE_MAP_RND;
1241 
1242                 else if (strcmp(f, "QUEUE_MAP_CPU") == 0)
1243                         pkt_dev->flags |= F_QUEUE_MAP_CPU;
1244 
1245                 else if (strcmp(f, "!QUEUE_MAP_CPU") == 0)
1246                         pkt_dev->flags &= ~F_QUEUE_MAP_CPU;
1247 #ifdef CONFIG_XFRM
1248                 else if (strcmp(f, "IPSEC") == 0)
1249                         pkt_dev->flags |= F_IPSEC_ON;
1250 #endif
1251 
1252                 else if (strcmp(f, "!IPV6") == 0)
1253                         pkt_dev->flags &= ~F_IPV6;
1254 
1255                 else if (strcmp(f, "NODE_ALLOC") == 0)
1256                         pkt_dev->flags |= F_NODE;
1257 
1258                 else if (strcmp(f, "!NODE_ALLOC") == 0)
1259                         pkt_dev->flags &= ~F_NODE;
1260 
1261                 else if (strcmp(f, "UDPCSUM") == 0)
1262                         pkt_dev->flags |= F_UDPCSUM;
1263 
1264                 else if (strcmp(f, "!UDPCSUM") == 0)
1265                         pkt_dev->flags &= ~F_UDPCSUM;
1266 
1267                 else if (strcmp(f, "NO_TIMESTAMP") == 0)
1268                         pkt_dev->flags |= F_NO_TIMESTAMP;
1269 
1270                 else {
1271                         sprintf(pg_result,
1272                                 "Flag -:%s:- unknown\nAvailable flags, (prepend ! to un-set flag):\n%s",
1273                                 f,
1274                                 "IPSRC_RND, IPDST_RND, UDPSRC_RND, UDPDST_RND, "
1275                                 "MACSRC_RND, MACDST_RND, TXSIZE_RND, IPV6, "
1276                                 "MPLS_RND, VID_RND, SVID_RND, FLOW_SEQ, "
1277                                 "QUEUE_MAP_RND, QUEUE_MAP_CPU, UDPCSUM, "
1278                                 "NO_TIMESTAMP, "
1279 #ifdef CONFIG_XFRM
1280                                 "IPSEC, "
1281 #endif
1282                                 "NODE_ALLOC\n");
1283                         return count;
1284                 }
1285                 sprintf(pg_result, "OK: flags=0x%x", pkt_dev->flags);
1286                 return count;
1287         }
1288         if (!strcmp(name, "dst_min") || !strcmp(name, "dst")) {
1289                 len = strn_len(&user_buffer[i], sizeof(pkt_dev->dst_min) - 1);
1290                 if (len < 0)
1291                         return len;
1292 
1293                 if (copy_from_user(buf, &user_buffer[i], len))
1294                         return -EFAULT;
1295                 buf[len] = 0;
1296                 if (strcmp(buf, pkt_dev->dst_min) != 0) {
1297                         memset(pkt_dev->dst_min, 0, sizeof(pkt_dev->dst_min));
1298                         strncpy(pkt_dev->dst_min, buf, len);
1299                         pkt_dev->daddr_min = in_aton(pkt_dev->dst_min);
1300                         pkt_dev->cur_daddr = pkt_dev->daddr_min;
1301                 }
1302                 if (debug)
1303                         pr_debug("dst_min set to: %s\n", pkt_dev->dst_min);
1304                 i += len;
1305                 sprintf(pg_result, "OK: dst_min=%s", pkt_dev->dst_min);
1306                 return count;
1307         }
1308         if (!strcmp(name, "dst_max")) {
1309                 len = strn_len(&user_buffer[i], sizeof(pkt_dev->dst_max) - 1);
1310                 if (len < 0)
1311                         return len;
1312 
1313 
1314                 if (copy_from_user(buf, &user_buffer[i], len))
1315                         return -EFAULT;
1316 
1317                 buf[len] = 0;
1318                 if (strcmp(buf, pkt_dev->dst_max) != 0) {
1319                         memset(pkt_dev->dst_max, 0, sizeof(pkt_dev->dst_max));
1320                         strncpy(pkt_dev->dst_max, buf, len);
1321                         pkt_dev->daddr_max = in_aton(pkt_dev->dst_max);
1322                         pkt_dev->cur_daddr = pkt_dev->daddr_max;
1323                 }
1324                 if (debug)
1325                         pr_debug("dst_max set to: %s\n", pkt_dev->dst_max);
1326                 i += len;
1327                 sprintf(pg_result, "OK: dst_max=%s", pkt_dev->dst_max);
1328                 return count;
1329         }
1330         if (!strcmp(name, "dst6")) {
1331                 len = strn_len(&user_buffer[i], sizeof(buf) - 1);
1332                 if (len < 0)
1333                         return len;
1334 
1335                 pkt_dev->flags |= F_IPV6;
1336 
1337                 if (copy_from_user(buf, &user_buffer[i], len))
1338                         return -EFAULT;
1339                 buf[len] = 0;
1340 
1341                 in6_pton(buf, -1, pkt_dev->in6_daddr.s6_addr, -1, NULL);
1342                 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->in6_daddr);
1343 
1344                 pkt_dev->cur_in6_daddr = pkt_dev->in6_daddr;
1345 
1346                 if (debug)
1347                         pr_debug("dst6 set to: %s\n", buf);
1348 
1349                 i += len;
1350                 sprintf(pg_result, "OK: dst6=%s", buf);
1351                 return count;
1352         }
1353         if (!strcmp(name, "dst6_min")) {
1354                 len = strn_len(&user_buffer[i], sizeof(buf) - 1);
1355                 if (len < 0)
1356                         return len;
1357 
1358                 pkt_dev->flags |= F_IPV6;
1359 
1360                 if (copy_from_user(buf, &user_buffer[i], len))
1361                         return -EFAULT;
1362                 buf[len] = 0;
1363 
1364                 in6_pton(buf, -1, pkt_dev->min_in6_daddr.s6_addr, -1, NULL);
1365                 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->min_in6_daddr);
1366 
1367                 pkt_dev->cur_in6_daddr = pkt_dev->min_in6_daddr;
1368                 if (debug)
1369                         pr_debug("dst6_min set to: %s\n", buf);
1370 
1371                 i += len;
1372                 sprintf(pg_result, "OK: dst6_min=%s", buf);
1373                 return count;
1374         }
1375         if (!strcmp(name, "dst6_max")) {
1376                 len = strn_len(&user_buffer[i], sizeof(buf) - 1);
1377                 if (len < 0)
1378                         return len;
1379 
1380                 pkt_dev->flags |= F_IPV6;
1381 
1382                 if (copy_from_user(buf, &user_buffer[i], len))
1383                         return -EFAULT;
1384                 buf[len] = 0;
1385 
1386                 in6_pton(buf, -1, pkt_dev->max_in6_daddr.s6_addr, -1, NULL);
1387                 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->max_in6_daddr);
1388 
1389                 if (debug)
1390                         pr_debug("dst6_max set to: %s\n", buf);
1391 
1392                 i += len;
1393                 sprintf(pg_result, "OK: dst6_max=%s", buf);
1394                 return count;
1395         }
1396         if (!strcmp(name, "src6")) {
1397                 len = strn_len(&user_buffer[i], sizeof(buf) - 1);
1398                 if (len < 0)
1399                         return len;
1400 
1401                 pkt_dev->flags |= F_IPV6;
1402 
1403                 if (copy_from_user(buf, &user_buffer[i], len))
1404                         return -EFAULT;
1405                 buf[len] = 0;
1406 
1407                 in6_pton(buf, -1, pkt_dev->in6_saddr.s6_addr, -1, NULL);
1408                 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->in6_saddr);
1409 
1410                 pkt_dev->cur_in6_saddr = pkt_dev->in6_saddr;
1411 
1412                 if (debug)
1413                         pr_debug("src6 set to: %s\n", buf);
1414 
1415                 i += len;
1416                 sprintf(pg_result, "OK: src6=%s", buf);
1417                 return count;
1418         }
1419         if (!strcmp(name, "src_min")) {
1420                 len = strn_len(&user_buffer[i], sizeof(pkt_dev->src_min) - 1);
1421                 if (len < 0)
1422                         return len;
1423 
1424                 if (copy_from_user(buf, &user_buffer[i], len))
1425                         return -EFAULT;
1426                 buf[len] = 0;
1427                 if (strcmp(buf, pkt_dev->src_min) != 0) {
1428                         memset(pkt_dev->src_min, 0, sizeof(pkt_dev->src_min));
1429                         strncpy(pkt_dev->src_min, buf, len);
1430                         pkt_dev->saddr_min = in_aton(pkt_dev->src_min);
1431                         pkt_dev->cur_saddr = pkt_dev->saddr_min;
1432                 }
1433                 if (debug)
1434                         pr_debug("src_min set to: %s\n", pkt_dev->src_min);
1435                 i += len;
1436                 sprintf(pg_result, "OK: src_min=%s", pkt_dev->src_min);
1437                 return count;
1438         }
1439         if (!strcmp(name, "src_max")) {
1440                 len = strn_len(&user_buffer[i], sizeof(pkt_dev->src_max) - 1);
1441                 if (len < 0)
1442                         return len;
1443 
1444                 if (copy_from_user(buf, &user_buffer[i], len))
1445                         return -EFAULT;
1446                 buf[len] = 0;
1447                 if (strcmp(buf, pkt_dev->src_max) != 0) {
1448                         memset(pkt_dev->src_max, 0, sizeof(pkt_dev->src_max));
1449                         strncpy(pkt_dev->src_max, buf, len);
1450                         pkt_dev->saddr_max = in_aton(pkt_dev->src_max);
1451                         pkt_dev->cur_saddr = pkt_dev->saddr_max;
1452                 }
1453                 if (debug)
1454                         pr_debug("src_max set to: %s\n", pkt_dev->src_max);
1455                 i += len;
1456                 sprintf(pg_result, "OK: src_max=%s", pkt_dev->src_max);
1457                 return count;
1458         }
1459         if (!strcmp(name, "dst_mac")) {
1460                 len = strn_len(&user_buffer[i], sizeof(valstr) - 1);
1461                 if (len < 0)
1462                         return len;
1463 
1464                 memset(valstr, 0, sizeof(valstr));
1465                 if (copy_from_user(valstr, &user_buffer[i], len))
1466                         return -EFAULT;
1467 
1468                 if (!mac_pton(valstr, pkt_dev->dst_mac))
1469                         return -EINVAL;
1470                 /* Set up Dest MAC */
1471                 ether_addr_copy(&pkt_dev->hh[0], pkt_dev->dst_mac);
1472 
1473                 sprintf(pg_result, "OK: dstmac %pM", pkt_dev->dst_mac);
1474                 return count;
1475         }
1476         if (!strcmp(name, "src_mac")) {
1477                 len = strn_len(&user_buffer[i], sizeof(valstr) - 1);
1478                 if (len < 0)
1479                         return len;
1480 
1481                 memset(valstr, 0, sizeof(valstr));
1482                 if (copy_from_user(valstr, &user_buffer[i], len))
1483                         return -EFAULT;
1484 
1485                 if (!mac_pton(valstr, pkt_dev->src_mac))
1486                         return -EINVAL;
1487                 /* Set up Src MAC */
1488                 ether_addr_copy(&pkt_dev->hh[6], pkt_dev->src_mac);
1489 
1490                 sprintf(pg_result, "OK: srcmac %pM", pkt_dev->src_mac);
1491                 return count;
1492         }
1493 
1494         if (!strcmp(name, "clear_counters")) {
1495                 pktgen_clear_counters(pkt_dev);
1496                 sprintf(pg_result, "OK: Clearing counters.\n");
1497                 return count;
1498         }
1499 
1500         if (!strcmp(name, "flows")) {
1501                 len = num_arg(&user_buffer[i], 10, &value);
1502                 if (len < 0)
1503                         return len;
1504 
1505                 i += len;
1506                 if (value > MAX_CFLOWS)
1507                         value = MAX_CFLOWS;
1508 
1509                 pkt_dev->cflows = value;
1510                 sprintf(pg_result, "OK: flows=%u", pkt_dev->cflows);
1511                 return count;
1512         }
1513 #ifdef CONFIG_XFRM
1514         if (!strcmp(name, "spi")) {
1515                 len = num_arg(&user_buffer[i], 10, &value);
1516                 if (len < 0)
1517                         return len;
1518 
1519                 i += len;
1520                 pkt_dev->spi = value;
1521                 sprintf(pg_result, "OK: spi=%u", pkt_dev->spi);
1522                 return count;
1523         }
1524 #endif
1525         if (!strcmp(name, "flowlen")) {
1526                 len = num_arg(&user_buffer[i], 10, &value);
1527                 if (len < 0)
1528                         return len;
1529 
1530                 i += len;
1531                 pkt_dev->lflow = value;
1532                 sprintf(pg_result, "OK: flowlen=%u", pkt_dev->lflow);
1533                 return count;
1534         }
1535 
1536         if (!strcmp(name, "queue_map_min")) {
1537                 len = num_arg(&user_buffer[i], 5, &value);
1538                 if (len < 0)
1539                         return len;
1540 
1541                 i += len;
1542                 pkt_dev->queue_map_min = value;
1543                 sprintf(pg_result, "OK: queue_map_min=%u", pkt_dev->queue_map_min);
1544                 return count;
1545         }
1546 
1547         if (!strcmp(name, "queue_map_max")) {
1548                 len = num_arg(&user_buffer[i], 5, &value);
1549                 if (len < 0)
1550                         return len;
1551 
1552                 i += len;
1553                 pkt_dev->queue_map_max = value;
1554                 sprintf(pg_result, "OK: queue_map_max=%u", pkt_dev->queue_map_max);
1555                 return count;
1556         }
1557 
1558         if (!strcmp(name, "mpls")) {
1559                 unsigned int n, cnt;
1560 
1561                 len = get_labels(&user_buffer[i], pkt_dev);
1562                 if (len < 0)
1563                         return len;
1564                 i += len;
1565                 cnt = sprintf(pg_result, "OK: mpls=");
1566                 for (n = 0; n < pkt_dev->nr_labels; n++)
1567                         cnt += sprintf(pg_result + cnt,
1568                                        "%08x%s", ntohl(pkt_dev->labels[n]),
1569                                        n == pkt_dev->nr_labels-1 ? "" : ",");
1570 
1571                 if (pkt_dev->nr_labels && pkt_dev->vlan_id != 0xffff) {
1572                         pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */
1573                         pkt_dev->svlan_id = 0xffff;
1574 
1575                         if (debug)
1576                                 pr_debug("VLAN/SVLAN auto turned off\n");
1577                 }
1578                 return count;
1579         }
1580 
1581         if (!strcmp(name, "vlan_id")) {
1582                 len = num_arg(&user_buffer[i], 4, &value);
1583                 if (len < 0)
1584                         return len;
1585 
1586                 i += len;
1587                 if (value <= 4095) {
1588                         pkt_dev->vlan_id = value;  /* turn on VLAN */
1589 
1590                         if (debug)
1591                                 pr_debug("VLAN turned on\n");
1592 
1593                         if (debug && pkt_dev->nr_labels)
1594                                 pr_debug("MPLS auto turned off\n");
1595 
1596                         pkt_dev->nr_labels = 0;    /* turn off MPLS */
1597                         sprintf(pg_result, "OK: vlan_id=%u", pkt_dev->vlan_id);
1598                 } else {
1599                         pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */
1600                         pkt_dev->svlan_id = 0xffff;
1601 
1602                         if (debug)
1603                                 pr_debug("VLAN/SVLAN turned off\n");
1604                 }
1605                 return count;
1606         }
1607 
1608         if (!strcmp(name, "vlan_p")) {
1609                 len = num_arg(&user_buffer[i], 1, &value);
1610                 if (len < 0)
1611                         return len;
1612 
1613                 i += len;
1614                 if ((value <= 7) && (pkt_dev->vlan_id != 0xffff)) {
1615                         pkt_dev->vlan_p = value;
1616                         sprintf(pg_result, "OK: vlan_p=%u", pkt_dev->vlan_p);
1617                 } else {
1618                         sprintf(pg_result, "ERROR: vlan_p must be 0-7");
1619                 }
1620                 return count;
1621         }
1622 
1623         if (!strcmp(name, "vlan_cfi")) {
1624                 len = num_arg(&user_buffer[i], 1, &value);
1625                 if (len < 0)
1626                         return len;
1627 
1628                 i += len;
1629                 if ((value <= 1) && (pkt_dev->vlan_id != 0xffff)) {
1630                         pkt_dev->vlan_cfi = value;
1631                         sprintf(pg_result, "OK: vlan_cfi=%u", pkt_dev->vlan_cfi);
1632                 } else {
1633                         sprintf(pg_result, "ERROR: vlan_cfi must be 0-1");
1634                 }
1635                 return count;
1636         }
1637 
1638         if (!strcmp(name, "svlan_id")) {
1639                 len = num_arg(&user_buffer[i], 4, &value);
1640                 if (len < 0)
1641                         return len;
1642 
1643                 i += len;
1644                 if ((value <= 4095) && ((pkt_dev->vlan_id != 0xffff))) {
1645                         pkt_dev->svlan_id = value;  /* turn on SVLAN */
1646 
1647                         if (debug)
1648                                 pr_debug("SVLAN turned on\n");
1649 
1650                         if (debug && pkt_dev->nr_labels)
1651                                 pr_debug("MPLS auto turned off\n");
1652 
1653                         pkt_dev->nr_labels = 0;    /* turn off MPLS */
1654                         sprintf(pg_result, "OK: svlan_id=%u", pkt_dev->svlan_id);
1655                 } else {
1656                         pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */
1657                         pkt_dev->svlan_id = 0xffff;
1658 
1659                         if (debug)
1660                                 pr_debug("VLAN/SVLAN turned off\n");
1661                 }
1662                 return count;
1663         }
1664 
1665         if (!strcmp(name, "svlan_p")) {
1666                 len = num_arg(&user_buffer[i], 1, &value);
1667                 if (len < 0)
1668                         return len;
1669 
1670                 i += len;
1671                 if ((value <= 7) && (pkt_dev->svlan_id != 0xffff)) {
1672                         pkt_dev->svlan_p = value;
1673                         sprintf(pg_result, "OK: svlan_p=%u", pkt_dev->svlan_p);
1674                 } else {
1675                         sprintf(pg_result, "ERROR: svlan_p must be 0-7");
1676                 }
1677                 return count;
1678         }
1679 
1680         if (!strcmp(name, "svlan_cfi")) {
1681                 len = num_arg(&user_buffer[i], 1, &value);
1682                 if (len < 0)
1683                         return len;
1684 
1685                 i += len;
1686                 if ((value <= 1) && (pkt_dev->svlan_id != 0xffff)) {
1687                         pkt_dev->svlan_cfi = value;
1688                         sprintf(pg_result, "OK: svlan_cfi=%u", pkt_dev->svlan_cfi);
1689                 } else {
1690                         sprintf(pg_result, "ERROR: svlan_cfi must be 0-1");
1691                 }
1692                 return count;
1693         }
1694 
1695         if (!strcmp(name, "tos")) {
1696                 __u32 tmp_value = 0;
1697                 len = hex32_arg(&user_buffer[i], 2, &tmp_value);
1698                 if (len < 0)
1699                         return len;
1700 
1701                 i += len;
1702                 if (len == 2) {
1703                         pkt_dev->tos = tmp_value;
1704                         sprintf(pg_result, "OK: tos=0x%02x", pkt_dev->tos);
1705                 } else {
1706                         sprintf(pg_result, "ERROR: tos must be 00-ff");
1707                 }
1708                 return count;
1709         }
1710 
1711         if (!strcmp(name, "traffic_class")) {
1712                 __u32 tmp_value = 0;
1713                 len = hex32_arg(&user_buffer[i], 2, &tmp_value);
1714                 if (len < 0)
1715                         return len;
1716 
1717                 i += len;
1718                 if (len == 2) {
1719                         pkt_dev->traffic_class = tmp_value;
1720                         sprintf(pg_result, "OK: traffic_class=0x%02x", pkt_dev->traffic_class);
1721                 } else {
1722                         sprintf(pg_result, "ERROR: traffic_class must be 00-ff");
1723                 }
1724                 return count;
1725         }
1726 
1727         if (!strcmp(name, "skb_priority")) {
1728                 len = num_arg(&user_buffer[i], 9, &value);
1729                 if (len < 0)
1730                         return len;
1731 
1732                 i += len;
1733                 pkt_dev->skb_priority = value;
1734                 sprintf(pg_result, "OK: skb_priority=%i",
1735                         pkt_dev->skb_priority);
1736                 return count;
1737         }
1738 
1739         sprintf(pkt_dev->result, "No such parameter \"%s\"", name);
1740         return -EINVAL;
1741 }
1742 
1743 static int pktgen_if_open(struct inode *inode, struct file *file)
1744 {
1745         return single_open(file, pktgen_if_show, PDE_DATA(inode));
1746 }
1747 
1748 static const struct file_operations pktgen_if_fops = {
1749         .owner   = THIS_MODULE,
1750         .open    = pktgen_if_open,
1751         .read    = seq_read,
1752         .llseek  = seq_lseek,
1753         .write   = pktgen_if_write,
1754         .release = single_release,
1755 };
1756 
1757 static int pktgen_thread_show(struct seq_file *seq, void *v)
1758 {
1759         struct pktgen_thread *t = seq->private;
1760         const struct pktgen_dev *pkt_dev;
1761 
1762         BUG_ON(!t);
1763 
1764         seq_puts(seq, "Running: ");
1765 
1766         rcu_read_lock();
1767         list_for_each_entry_rcu(pkt_dev, &t->if_list, list)
1768                 if (pkt_dev->running)
1769                         seq_printf(seq, "%s ", pkt_dev->odevname);
1770 
1771         seq_puts(seq, "\nStopped: ");
1772 
1773         list_for_each_entry_rcu(pkt_dev, &t->if_list, list)
1774                 if (!pkt_dev->running)
1775                         seq_printf(seq, "%s ", pkt_dev->odevname);
1776 
1777         if (t->result[0])
1778                 seq_printf(seq, "\nResult: %s\n", t->result);
1779         else
1780                 seq_puts(seq, "\nResult: NA\n");
1781 
1782         rcu_read_unlock();
1783 
1784         return 0;
1785 }
1786 
1787 static ssize_t pktgen_thread_write(struct file *file,
1788                                    const char __user * user_buffer,
1789                                    size_t count, loff_t * offset)
1790 {
1791         struct seq_file *seq = file->private_data;
1792         struct pktgen_thread *t = seq->private;
1793         int i, max, len, ret;
1794         char name[40];
1795         char *pg_result;
1796 
1797         if (count < 1) {
1798                 //      sprintf(pg_result, "Wrong command format");
1799                 return -EINVAL;
1800         }
1801 
1802         max = count;
1803         len = count_trail_chars(user_buffer, max);
1804         if (len < 0)
1805                 return len;
1806 
1807         i = len;
1808 
1809         /* Read variable name */
1810 
1811         len = strn_len(&user_buffer[i], sizeof(name) - 1);
1812         if (len < 0)
1813                 return len;
1814 
1815         memset(name, 0, sizeof(name));
1816         if (copy_from_user(name, &user_buffer[i], len))
1817                 return -EFAULT;
1818         i += len;
1819 
1820         max = count - i;
1821         len = count_trail_chars(&user_buffer[i], max);
1822         if (len < 0)
1823                 return len;
1824 
1825         i += len;
1826 
1827         if (debug)
1828                 pr_debug("t=%s, count=%lu\n", name, (unsigned long)count);
1829 
1830         if (!t) {
1831                 pr_err("ERROR: No thread\n");
1832                 ret = -EINVAL;
1833                 goto out;
1834         }
1835 
1836         pg_result = &(t->result[0]);
1837 
1838         if (!strcmp(name, "add_device")) {
1839                 char f[32];
1840                 memset(f, 0, 32);
1841                 len = strn_len(&user_buffer[i], sizeof(f) - 1);
1842                 if (len < 0) {
1843                         ret = len;
1844                         goto out;
1845                 }
1846                 if (copy_from_user(f, &user_buffer[i], len))
1847                         return -EFAULT;
1848                 i += len;
1849                 mutex_lock(&pktgen_thread_lock);
1850                 ret = pktgen_add_device(t, f);
1851                 mutex_unlock(&pktgen_thread_lock);
1852                 if (!ret) {
1853                         ret = count;
1854                         sprintf(pg_result, "OK: add_device=%s", f);
1855                 } else
1856                         sprintf(pg_result, "ERROR: can not add device %s", f);
1857                 goto out;
1858         }
1859 
1860         if (!strcmp(name, "rem_device_all")) {
1861                 mutex_lock(&pktgen_thread_lock);
1862                 t->control |= T_REMDEVALL;
1863                 mutex_unlock(&pktgen_thread_lock);
1864                 schedule_timeout_interruptible(msecs_to_jiffies(125));  /* Propagate thread->control  */
1865                 ret = count;
1866                 sprintf(pg_result, "OK: rem_device_all");
1867                 goto out;
1868         }
1869 
1870         if (!strcmp(name, "max_before_softirq")) {
1871                 sprintf(pg_result, "OK: Note! max_before_softirq is obsoleted -- Do not use");
1872                 ret = count;
1873                 goto out;
1874         }
1875 
1876         ret = -EINVAL;
1877 out:
1878         return ret;
1879 }
1880 
1881 static int pktgen_thread_open(struct inode *inode, struct file *file)
1882 {
1883         return single_open(file, pktgen_thread_show, PDE_DATA(inode));
1884 }
1885 
1886 static const struct file_operations pktgen_thread_fops = {
1887         .owner   = THIS_MODULE,
1888         .open    = pktgen_thread_open,
1889         .read    = seq_read,
1890         .llseek  = seq_lseek,
1891         .write   = pktgen_thread_write,
1892         .release = single_release,
1893 };
1894 
1895 /* Think find or remove for NN */
1896 static struct pktgen_dev *__pktgen_NN_threads(const struct pktgen_net *pn,
1897                                               const char *ifname, int remove)
1898 {
1899         struct pktgen_thread *t;
1900         struct pktgen_dev *pkt_dev = NULL;
1901         bool exact = (remove == FIND);
1902 
1903         list_for_each_entry(t, &pn->pktgen_threads, th_list) {
1904                 pkt_dev = pktgen_find_dev(t, ifname, exact);
1905                 if (pkt_dev) {
1906                         if (remove) {
1907                                 pkt_dev->removal_mark = 1;
1908                                 t->control |= T_REMDEV;
1909                         }
1910                         break;
1911                 }
1912         }
1913         return pkt_dev;
1914 }
1915 
1916 /*
1917  * mark a device for removal
1918  */
1919 static void pktgen_mark_device(const struct pktgen_net *pn, const char *ifname)
1920 {
1921         struct pktgen_dev *pkt_dev = NULL;
1922         const int max_tries = 10, msec_per_try = 125;
1923         int i = 0;
1924 
1925         mutex_lock(&pktgen_thread_lock);
1926         pr_debug("%s: marking %s for removal\n", __func__, ifname);
1927 
1928         while (1) {
1929 
1930                 pkt_dev = __pktgen_NN_threads(pn, ifname, REMOVE);
1931                 if (pkt_dev == NULL)
1932                         break;  /* success */
1933 
1934                 mutex_unlock(&pktgen_thread_lock);
1935                 pr_debug("%s: waiting for %s to disappear....\n",
1936                          __func__, ifname);
1937                 schedule_timeout_interruptible(msecs_to_jiffies(msec_per_try));
1938                 mutex_lock(&pktgen_thread_lock);
1939 
1940                 if (++i >= max_tries) {
1941                         pr_err("%s: timed out after waiting %d msec for device %s to be removed\n",
1942                                __func__, msec_per_try * i, ifname);
1943                         break;
1944                 }
1945 
1946         }
1947 
1948         mutex_unlock(&pktgen_thread_lock);
1949 }
1950 
1951 static void pktgen_change_name(const struct pktgen_net *pn, struct net_device *dev)
1952 {
1953         struct pktgen_thread *t;
1954 
1955         list_for_each_entry(t, &pn->pktgen_threads, th_list) {
1956                 struct pktgen_dev *pkt_dev;
1957 
1958                 rcu_read_lock();
1959                 list_for_each_entry_rcu(pkt_dev, &t->if_list, list) {
1960                         if (pkt_dev->odev != dev)
1961                                 continue;
1962 
1963                         proc_remove(pkt_dev->entry);
1964 
1965                         pkt_dev->entry = proc_create_data(dev->name, 0600,
1966                                                           pn->proc_dir,
1967                                                           &pktgen_if_fops,
1968                                                           pkt_dev);
1969                         if (!pkt_dev->entry)
1970                                 pr_err("can't move proc entry for '%s'\n",
1971                                        dev->name);
1972                         break;
1973                 }
1974                 rcu_read_unlock();
1975         }
1976 }
1977 
1978 static int pktgen_device_event(struct notifier_block *unused,
1979                                unsigned long event, void *ptr)
1980 {
1981         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1982         struct pktgen_net *pn = net_generic(dev_net(dev), pg_net_id);
1983 
1984         if (pn->pktgen_exiting)
1985                 return NOTIFY_DONE;
1986 
1987         /* It is OK that we do not hold the group lock right now,
1988          * as we run under the RTNL lock.
1989          */
1990 
1991         switch (event) {
1992         case NETDEV_CHANGENAME:
1993                 pktgen_change_name(pn, dev);
1994                 break;
1995 
1996         case NETDEV_UNREGISTER:
1997                 pktgen_mark_device(pn, dev->name);
1998                 break;
1999         }
2000 
2001         return NOTIFY_DONE;
2002 }
2003 
2004 static struct net_device *pktgen_dev_get_by_name(const struct pktgen_net *pn,
2005                                                  struct pktgen_dev *pkt_dev,
2006                                                  const char *ifname)
2007 {
2008         char b[IFNAMSIZ+5];
2009         int i;
2010 
2011         for (i = 0; ifname[i] != '@'; i++) {
2012                 if (i == IFNAMSIZ)
2013                         break;
2014 
2015                 b[i] = ifname[i];
2016         }
2017         b[i] = 0;
2018 
2019         return dev_get_by_name(pn->net, b);
2020 }
2021 
2022 
2023 /* Associate pktgen_dev with a device. */
2024 
2025 static int pktgen_setup_dev(const struct pktgen_net *pn,
2026                             struct pktgen_dev *pkt_dev, const char *ifname)
2027 {
2028         struct net_device *odev;
2029         int err;
2030 
2031         /* Clean old setups */
2032         if (pkt_dev->odev) {
2033                 dev_put(pkt_dev->odev);
2034                 pkt_dev->odev = NULL;
2035         }
2036 
2037         odev = pktgen_dev_get_by_name(pn, pkt_dev, ifname);
2038         if (!odev) {
2039                 pr_err("no such netdevice: \"%s\"\n", ifname);
2040                 return -ENODEV;
2041         }
2042 
2043         if (odev->type != ARPHRD_ETHER) {
2044                 pr_err("not an ethernet device: \"%s\"\n", ifname);
2045                 err = -EINVAL;
2046         } else if (!netif_running(odev)) {
2047                 pr_err("device is down: \"%s\"\n", ifname);
2048                 err = -ENETDOWN;
2049         } else {
2050                 pkt_dev->odev = odev;
2051                 return 0;
2052         }
2053 
2054         dev_put(odev);
2055         return err;
2056 }
2057 
2058 /* Read pkt_dev from the interface and set up internal pktgen_dev
2059  * structure to have the right information to create/send packets
2060  */
2061 static void pktgen_setup_inject(struct pktgen_dev *pkt_dev)
2062 {
2063         int ntxq;
2064 
2065         if (!pkt_dev->odev) {
2066                 pr_err("ERROR: pkt_dev->odev == NULL in setup_inject\n");
2067                 sprintf(pkt_dev->result,
2068                         "ERROR: pkt_dev->odev == NULL in setup_inject.\n");
2069                 return;
2070         }
2071 
2072         /* make sure that we don't pick a non-existing transmit queue */
2073         ntxq = pkt_dev->odev->real_num_tx_queues;
2074 
2075         if (ntxq <= pkt_dev->queue_map_min) {
2076                 pr_warn("WARNING: Requested queue_map_min (zero-based) (%d) exceeds valid range [0 - %d] for (%d) queues on %s, resetting\n",
2077                         pkt_dev->queue_map_min, (ntxq ?: 1) - 1, ntxq,
2078                         pkt_dev->odevname);
2079                 pkt_dev->queue_map_min = (ntxq ?: 1) - 1;
2080         }
2081         if (pkt_dev->queue_map_max >= ntxq) {
2082                 pr_warn("WARNING: Requested queue_map_max (zero-based) (%d) exceeds valid range [0 - %d] for (%d) queues on %s, resetting\n",
2083                         pkt_dev->queue_map_max, (ntxq ?: 1) - 1, ntxq,
2084                         pkt_dev->odevname);
2085                 pkt_dev->queue_map_max = (ntxq ?: 1) - 1;
2086         }
2087 
2088         /* Default to the interface's mac if not explicitly set. */
2089 
2090         if (is_zero_ether_addr(pkt_dev->src_mac))
2091                 ether_addr_copy(&(pkt_dev->hh[6]), pkt_dev->odev->dev_addr);
2092 
2093         /* Set up Dest MAC */
2094         ether_addr_copy(&(pkt_dev->hh[0]), pkt_dev->dst_mac);
2095 
2096         if (pkt_dev->flags & F_IPV6) {
2097                 int i, set = 0, err = 1;
2098                 struct inet6_dev *idev;
2099 
2100                 if (pkt_dev->min_pkt_size == 0) {
2101                         pkt_dev->min_pkt_size = 14 + sizeof(struct ipv6hdr)
2102                                                 + sizeof(struct udphdr)
2103                                                 + sizeof(struct pktgen_hdr)
2104                                                 + pkt_dev->pkt_overhead;
2105                 }
2106 
2107                 for (i = 0; i < IN6_ADDR_HSIZE; i++)
2108                         if (pkt_dev->cur_in6_saddr.s6_addr[i]) {
2109                                 set = 1;
2110                                 break;
2111                         }
2112 
2113                 if (!set) {
2114 
2115                         /*
2116                          * Use linklevel address if unconfigured.
2117                          *
2118                          * use ipv6_get_lladdr if/when it's get exported
2119                          */
2120 
2121                         rcu_read_lock();
2122                         idev = __in6_dev_get(pkt_dev->odev);
2123                         if (idev) {
2124                                 struct inet6_ifaddr *ifp;
2125 
2126                                 read_lock_bh(&idev->lock);
2127                                 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2128                                         if ((ifp->scope & IFA_LINK) &&
2129                                             !(ifp->flags & IFA_F_TENTATIVE)) {
2130                                                 pkt_dev->cur_in6_saddr = ifp->addr;
2131                                                 err = 0;
2132                                                 break;
2133                                         }
2134                                 }
2135                                 read_unlock_bh(&idev->lock);
2136                         }
2137                         rcu_read_unlock();
2138                         if (err)
2139                                 pr_err("ERROR: IPv6 link address not available\n");
2140                 }
2141         } else {
2142                 if (pkt_dev->min_pkt_size == 0) {
2143                         pkt_dev->min_pkt_size = 14 + sizeof(struct iphdr)
2144                                                 + sizeof(struct udphdr)
2145                                                 + sizeof(struct pktgen_hdr)
2146                                                 + pkt_dev->pkt_overhead;
2147                 }
2148 
2149                 pkt_dev->saddr_min = 0;
2150                 pkt_dev->saddr_max = 0;
2151                 if (strlen(pkt_dev->src_min) == 0) {
2152 
2153                         struct in_device *in_dev;
2154 
2155                         rcu_read_lock();
2156                         in_dev = __in_dev_get_rcu(pkt_dev->odev);
2157                         if (in_dev) {
2158                                 if (in_dev->ifa_list) {
2159                                         pkt_dev->saddr_min =
2160                                             in_dev->ifa_list->ifa_address;
2161                                         pkt_dev->saddr_max = pkt_dev->saddr_min;
2162                                 }
2163                         }
2164                         rcu_read_unlock();
2165                 } else {
2166                         pkt_dev->saddr_min = in_aton(pkt_dev->src_min);
2167                         pkt_dev->saddr_max = in_aton(pkt_dev->src_max);
2168                 }
2169 
2170                 pkt_dev->daddr_min = in_aton(pkt_dev->dst_min);
2171                 pkt_dev->daddr_max = in_aton(pkt_dev->dst_max);
2172         }
2173         /* Initialize current values. */
2174         pkt_dev->cur_pkt_size = pkt_dev->min_pkt_size;
2175         if (pkt_dev->min_pkt_size > pkt_dev->max_pkt_size)
2176                 pkt_dev->max_pkt_size = pkt_dev->min_pkt_size;
2177 
2178         pkt_dev->cur_dst_mac_offset = 0;
2179         pkt_dev->cur_src_mac_offset = 0;
2180         pkt_dev->cur_saddr = pkt_dev->saddr_min;
2181         pkt_dev->cur_daddr = pkt_dev->daddr_min;
2182         pkt_dev->cur_udp_dst = pkt_dev->udp_dst_min;
2183         pkt_dev->cur_udp_src = pkt_dev->udp_src_min;
2184         pkt_dev->nflows = 0;
2185 }
2186 
2187 
2188 static void spin(struct pktgen_dev *pkt_dev, ktime_t spin_until)
2189 {
2190         ktime_t start_time, end_time;
2191         s64 remaining;
2192         struct hrtimer_sleeper t;
2193 
2194         hrtimer_init_on_stack(&t.timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
2195         hrtimer_set_expires(&t.timer, spin_until);
2196 
2197         remaining = ktime_to_ns(hrtimer_expires_remaining(&t.timer));
2198         if (remaining <= 0) {
2199                 pkt_dev->next_tx = ktime_add_ns(spin_until, pkt_dev->delay);
2200                 return;
2201         }
2202 
2203         start_time = ktime_get();
2204         if (remaining < 100000) {
2205                 /* for small delays (<100us), just loop until limit is reached */
2206                 do {
2207                         end_time = ktime_get();
2208                 } while (ktime_compare(end_time, spin_until) < 0);
2209         } else {
2210                 /* see do_nanosleep */
2211                 hrtimer_init_sleeper(&t, current);
2212                 do {
2213                         set_current_state(TASK_INTERRUPTIBLE);
2214                         hrtimer_start_expires(&t.timer, HRTIMER_MODE_ABS);
2215                         if (!hrtimer_active(&t.timer))
2216                                 t.task = NULL;
2217 
2218                         if (likely(t.task))
2219                                 schedule();
2220 
2221                         hrtimer_cancel(&t.timer);
2222                 } while (t.task && pkt_dev->running && !signal_pending(current));
2223                 __set_current_state(TASK_RUNNING);
2224                 end_time = ktime_get();
2225         }
2226 
2227         pkt_dev->idle_acc += ktime_to_ns(ktime_sub(end_time, start_time));
2228         pkt_dev->next_tx = ktime_add_ns(spin_until, pkt_dev->delay);
2229 }
2230 
2231 static inline void set_pkt_overhead(struct pktgen_dev *pkt_dev)
2232 {
2233         pkt_dev->pkt_overhead = 0;
2234         pkt_dev->pkt_overhead += pkt_dev->nr_labels*sizeof(u32);
2235         pkt_dev->pkt_overhead += VLAN_TAG_SIZE(pkt_dev);
2236         pkt_dev->pkt_overhead += SVLAN_TAG_SIZE(pkt_dev);
2237 }
2238 
2239 static inline int f_seen(const struct pktgen_dev *pkt_dev, int flow)
2240 {
2241         return !!(pkt_dev->flows[flow].flags & F_INIT);
2242 }
2243 
2244 static inline int f_pick(struct pktgen_dev *pkt_dev)
2245 {
2246         int flow = pkt_dev->curfl;
2247 
2248         if (pkt_dev->flags & F_FLOW_SEQ) {
2249                 if (pkt_dev->flows[flow].count >= pkt_dev->lflow) {
2250                         /* reset time */
2251                         pkt_dev->flows[flow].count = 0;
2252                         pkt_dev->flows[flow].flags = 0;
2253                         pkt_dev->curfl += 1;
2254                         if (pkt_dev->curfl >= pkt_dev->cflows)
2255                                 pkt_dev->curfl = 0; /*reset */
2256                 }
2257         } else {
2258                 flow = prandom_u32() % pkt_dev->cflows;
2259                 pkt_dev->curfl = flow;
2260 
2261                 if (pkt_dev->flows[flow].count > pkt_dev->lflow) {
2262                         pkt_dev->flows[flow].count = 0;
2263                         pkt_dev->flows[flow].flags = 0;
2264                 }
2265         }
2266 
2267         return pkt_dev->curfl;
2268 }
2269 
2270 
2271 #ifdef CONFIG_XFRM
2272 /* If there was already an IPSEC SA, we keep it as is, else
2273  * we go look for it ...
2274 */
2275 #define DUMMY_MARK 0
2276 static void get_ipsec_sa(struct pktgen_dev *pkt_dev, int flow)
2277 {
2278         struct xfrm_state *x = pkt_dev->flows[flow].x;
2279         struct pktgen_net *pn = net_generic(dev_net(pkt_dev->odev), pg_net_id);
2280         if (!x) {
2281 
2282                 if (pkt_dev->spi) {
2283                         /* We need as quick as possible to find the right SA
2284                          * Searching with minimum criteria to archieve this.
2285                          */
2286                         x = xfrm_state_lookup_byspi(pn->net, htonl(pkt_dev->spi), AF_INET);
2287                 } else {
2288                         /* slow path: we dont already have xfrm_state */
2289                         x = xfrm_stateonly_find(pn->net, DUMMY_MARK,
2290                                                 (xfrm_address_t *)&pkt_dev->cur_daddr,
2291                                                 (xfrm_address_t *)&pkt_dev->cur_saddr,
2292                                                 AF_INET,
2293                                                 pkt_dev->ipsmode,
2294                                                 pkt_dev->ipsproto, 0);
2295                 }
2296                 if (x) {
2297                         pkt_dev->flows[flow].x = x;
2298                         set_pkt_overhead(pkt_dev);
2299                         pkt_dev->pkt_overhead += x->props.header_len;
2300                 }
2301 
2302         }
2303 }
2304 #endif
2305 static void set_cur_queue_map(struct pktgen_dev *pkt_dev)
2306 {
2307 
2308         if (pkt_dev->flags & F_QUEUE_MAP_CPU)
2309                 pkt_dev->cur_queue_map = smp_processor_id();
2310 
2311         else if (pkt_dev->queue_map_min <= pkt_dev->queue_map_max) {
2312                 __u16 t;
2313                 if (pkt_dev->flags & F_QUEUE_MAP_RND) {
2314                         t = prandom_u32() %
2315                                 (pkt_dev->queue_map_max -
2316                                  pkt_dev->queue_map_min + 1)
2317                                 + pkt_dev->queue_map_min;
2318                 } else {
2319                         t = pkt_dev->cur_queue_map + 1;
2320                         if (t > pkt_dev->queue_map_max)
2321                                 t = pkt_dev->queue_map_min;
2322                 }
2323                 pkt_dev->cur_queue_map = t;
2324         }
2325         pkt_dev->cur_queue_map  = pkt_dev->cur_queue_map % pkt_dev->odev->real_num_tx_queues;
2326 }
2327 
2328 /* Increment/randomize headers according to flags and current values
2329  * for IP src/dest, UDP src/dst port, MAC-Addr src/dst
2330  */
2331 static void mod_cur_headers(struct pktgen_dev *pkt_dev)
2332 {
2333         __u32 imn;
2334         __u32 imx;
2335         int flow = 0;
2336 
2337         if (pkt_dev->cflows)
2338                 flow = f_pick(pkt_dev);
2339 
2340         /*  Deal with source MAC */
2341         if (pkt_dev->src_mac_count > 1) {
2342                 __u32 mc;
2343                 __u32 tmp;
2344 
2345                 if (pkt_dev->flags & F_MACSRC_RND)
2346                         mc = prandom_u32() % pkt_dev->src_mac_count;
2347                 else {
2348                         mc = pkt_dev->cur_src_mac_offset++;
2349                         if (pkt_dev->cur_src_mac_offset >=
2350                             pkt_dev->src_mac_count)
2351                                 pkt_dev->cur_src_mac_offset = 0;
2352                 }
2353 
2354                 tmp = pkt_dev->src_mac[5] + (mc & 0xFF);
2355                 pkt_dev->hh[11] = tmp;
2356                 tmp = (pkt_dev->src_mac[4] + ((mc >> 8) & 0xFF) + (tmp >> 8));
2357                 pkt_dev->hh[10] = tmp;
2358                 tmp = (pkt_dev->src_mac[3] + ((mc >> 16) & 0xFF) + (tmp >> 8));
2359                 pkt_dev->hh[9] = tmp;
2360                 tmp = (pkt_dev->src_mac[2] + ((mc >> 24) & 0xFF) + (tmp >> 8));
2361                 pkt_dev->hh[8] = tmp;
2362                 tmp = (pkt_dev->src_mac[1] + (tmp >> 8));
2363                 pkt_dev->hh[7] = tmp;
2364         }
2365 
2366         /*  Deal with Destination MAC */
2367         if (pkt_dev->dst_mac_count > 1) {
2368                 __u32 mc;
2369                 __u32 tmp;
2370 
2371                 if (pkt_dev->flags & F_MACDST_RND)
2372                         mc = prandom_u32() % pkt_dev->dst_mac_count;
2373 
2374                 else {
2375                         mc = pkt_dev->cur_dst_mac_offset++;
2376                         if (pkt_dev->cur_dst_mac_offset >=
2377                             pkt_dev->dst_mac_count) {
2378                                 pkt_dev->cur_dst_mac_offset = 0;
2379                         }
2380                 }
2381 
2382                 tmp = pkt_dev->dst_mac[5] + (mc & 0xFF);
2383                 pkt_dev->hh[5] = tmp;
2384                 tmp = (pkt_dev->dst_mac[4] + ((mc >> 8) & 0xFF) + (tmp >> 8));
2385                 pkt_dev->hh[4] = tmp;
2386                 tmp = (pkt_dev->dst_mac[3] + ((mc >> 16) & 0xFF) + (tmp >> 8));
2387                 pkt_dev->hh[3] = tmp;
2388                 tmp = (pkt_dev->dst_mac[2] + ((mc >> 24) & 0xFF) + (tmp >> 8));
2389                 pkt_dev->hh[2] = tmp;
2390                 tmp = (pkt_dev->dst_mac[1] + (tmp >> 8));
2391                 pkt_dev->hh[1] = tmp;
2392         }
2393 
2394         if (pkt_dev->flags & F_MPLS_RND) {
2395                 unsigned int i;
2396                 for (i = 0; i < pkt_dev->nr_labels; i++)
2397                         if (pkt_dev->labels[i] & MPLS_STACK_BOTTOM)
2398                                 pkt_dev->labels[i] = MPLS_STACK_BOTTOM |
2399                                              ((__force __be32)prandom_u32() &
2400                                                       htonl(0x000fffff));
2401         }
2402 
2403         if ((pkt_dev->flags & F_VID_RND) && (pkt_dev->vlan_id != 0xffff)) {
2404                 pkt_dev->vlan_id = prandom_u32() & (4096 - 1);
2405         }
2406 
2407         if ((pkt_dev->flags & F_SVID_RND) && (pkt_dev->svlan_id != 0xffff)) {
2408                 pkt_dev->svlan_id = prandom_u32() & (4096 - 1);
2409         }
2410 
2411         if (pkt_dev->udp_src_min < pkt_dev->udp_src_max) {
2412                 if (pkt_dev->flags & F_UDPSRC_RND)
2413                         pkt_dev->cur_udp_src = prandom_u32() %
2414                                 (pkt_dev->udp_src_max - pkt_dev->udp_src_min)
2415                                 + pkt_dev->udp_src_min;
2416 
2417                 else {
2418                         pkt_dev->cur_udp_src++;
2419                         if (pkt_dev->cur_udp_src >= pkt_dev->udp_src_max)
2420                                 pkt_dev->cur_udp_src = pkt_dev->udp_src_min;
2421                 }
2422         }
2423 
2424         if (pkt_dev->udp_dst_min < pkt_dev->udp_dst_max) {
2425                 if (pkt_dev->flags & F_UDPDST_RND) {
2426                         pkt_dev->cur_udp_dst = prandom_u32() %
2427                                 (pkt_dev->udp_dst_max - pkt_dev->udp_dst_min)
2428                                 + pkt_dev->udp_dst_min;
2429                 } else {
2430                         pkt_dev->cur_udp_dst++;
2431                         if (pkt_dev->cur_udp_dst >= pkt_dev->udp_dst_max)
2432                                 pkt_dev->cur_udp_dst = pkt_dev->udp_dst_min;
2433                 }
2434         }
2435 
2436         if (!(pkt_dev->flags & F_IPV6)) {
2437 
2438                 imn = ntohl(pkt_dev->saddr_min);
2439                 imx = ntohl(pkt_dev->saddr_max);
2440                 if (imn < imx) {
2441                         __u32 t;
2442                         if (pkt_dev->flags & F_IPSRC_RND)
2443                                 t = prandom_u32() % (imx - imn) + imn;
2444                         else {
2445                                 t = ntohl(pkt_dev->cur_saddr);
2446                                 t++;
2447                                 if (t > imx)
2448                                         t = imn;
2449 
2450                         }
2451                         pkt_dev->cur_saddr = htonl(t);
2452                 }
2453 
2454                 if (pkt_dev->cflows && f_seen(pkt_dev, flow)) {
2455                         pkt_dev->cur_daddr = pkt_dev->flows[flow].cur_daddr;
2456                 } else {
2457                         imn = ntohl(pkt_dev->daddr_min);
2458                         imx = ntohl(pkt_dev->daddr_max);
2459                         if (imn < imx) {
2460                                 __u32 t;
2461                                 __be32 s;
2462                                 if (pkt_dev->flags & F_IPDST_RND) {
2463 
2464                                         do {
2465                                                 t = prandom_u32() %
2466                                                         (imx - imn) + imn;
2467                                                 s = htonl(t);
2468                                         } while (ipv4_is_loopback(s) ||
2469                                                 ipv4_is_multicast(s) ||
2470                                                 ipv4_is_lbcast(s) ||
2471                                                 ipv4_is_zeronet(s) ||
2472                                                 ipv4_is_local_multicast(s));
2473                                         pkt_dev->cur_daddr = s;
2474                                 } else {
2475                                         t = ntohl(pkt_dev->cur_daddr);
2476                                         t++;
2477                                         if (t > imx) {
2478                                                 t = imn;
2479                                         }
2480                                         pkt_dev->cur_daddr = htonl(t);
2481                                 }
2482                         }
2483                         if (pkt_dev->cflows) {
2484                                 pkt_dev->flows[flow].flags |= F_INIT;
2485                                 pkt_dev->flows[flow].cur_daddr =
2486                                     pkt_dev->cur_daddr;
2487 #ifdef CONFIG_XFRM
2488                                 if (pkt_dev->flags & F_IPSEC_ON)
2489                                         get_ipsec_sa(pkt_dev, flow);
2490 #endif
2491                                 pkt_dev->nflows++;
2492                         }
2493                 }
2494         } else {                /* IPV6 * */
2495 
2496                 if (!ipv6_addr_any(&pkt_dev->min_in6_daddr)) {
2497                         int i;
2498 
2499                         /* Only random destinations yet */
2500 
2501                         for (i = 0; i < 4; i++) {
2502                                 pkt_dev->cur_in6_daddr.s6_addr32[i] =
2503                                     (((__force __be32)prandom_u32() |
2504                                       pkt_dev->min_in6_daddr.s6_addr32[i]) &
2505                                      pkt_dev->max_in6_daddr.s6_addr32[i]);
2506                         }
2507                 }
2508         }
2509 
2510         if (pkt_dev->min_pkt_size < pkt_dev->max_pkt_size) {
2511                 __u32 t;
2512                 if (pkt_dev->flags & F_TXSIZE_RND) {
2513                         t = prandom_u32() %
2514                                 (pkt_dev->max_pkt_size - pkt_dev->min_pkt_size)
2515                                 + pkt_dev->min_pkt_size;
2516                 } else {
2517                         t = pkt_dev->cur_pkt_size + 1;
2518                         if (t > pkt_dev->max_pkt_size)
2519                                 t = pkt_dev->min_pkt_size;
2520                 }
2521                 pkt_dev->cur_pkt_size = t;
2522         }
2523 
2524         set_cur_queue_map(pkt_dev);
2525 
2526         pkt_dev->flows[flow].count++;
2527 }
2528 
2529 
2530 #ifdef CONFIG_XFRM
2531 static u32 pktgen_dst_metrics[RTAX_MAX + 1] = {
2532 
2533         [RTAX_HOPLIMIT] = 0x5, /* Set a static hoplimit */
2534 };
2535 
2536 static int pktgen_output_ipsec(struct sk_buff *skb, struct pktgen_dev *pkt_dev)
2537 {
2538         struct xfrm_state *x = pkt_dev->flows[pkt_dev->curfl].x;
2539         int err = 0;
2540         struct net *net = dev_net(pkt_dev->odev);
2541 
2542         if (!x)
2543                 return 0;
2544         /* XXX: we dont support tunnel mode for now until
2545          * we resolve the dst issue */
2546         if ((x->props.mode != XFRM_MODE_TRANSPORT) && (pkt_dev->spi == 0))
2547                 return 0;
2548 
2549         /* But when user specify an valid SPI, transformation
2550          * supports both transport/tunnel mode + ESP/AH type.
2551          */
2552         if ((x->props.mode == XFRM_MODE_TUNNEL) && (pkt_dev->spi != 0))
2553                 skb->_skb_refdst = (unsigned long)&pkt_dev->dst | SKB_DST_NOREF;
2554 
2555         rcu_read_lock_bh();
2556         err = x->outer_mode->output(x, skb);
2557         rcu_read_unlock_bh();
2558         if (err) {
2559                 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEMODEERROR);
2560                 goto error;
2561         }
2562         err = x->type->output(x, skb);
2563         if (err) {
2564                 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEPROTOERROR);
2565                 goto error;
2566         }
2567         spin_lock_bh(&x->lock);
2568         x->curlft.bytes += skb->len;
2569         x->curlft.packets++;
2570         spin_unlock_bh(&x->lock);
2571 error:
2572         return err;
2573 }
2574 
2575 static void free_SAs(struct pktgen_dev *pkt_dev)
2576 {
2577         if (pkt_dev->cflows) {
2578                 /* let go of the SAs if we have them */
2579                 int i;
2580                 for (i = 0; i < pkt_dev->cflows; i++) {
2581                         struct xfrm_state *x = pkt_dev->flows[i].x;
2582                         if (x) {
2583                                 xfrm_state_put(x);
2584                                 pkt_dev->flows[i].x = NULL;
2585                         }
2586                 }
2587         }
2588 }
2589 
2590 static int process_ipsec(struct pktgen_dev *pkt_dev,
2591                               struct sk_buff *skb, __be16 protocol)
2592 {
2593         if (pkt_dev->flags & F_IPSEC_ON) {
2594                 struct xfrm_state *x = pkt_dev->flows[pkt_dev->curfl].x;
2595                 int nhead = 0;
2596                 if (x) {
2597                         int ret;
2598                         __u8 *eth;
2599                         struct iphdr *iph;
2600 
2601                         nhead = x->props.header_len - skb_headroom(skb);
2602                         if (nhead > 0) {
2603                                 ret = pskb_expand_head(skb, nhead, 0, GFP_ATOMIC);
2604                                 if (ret < 0) {
2605                                         pr_err("Error expanding ipsec packet %d\n",
2606                                                ret);
2607                                         goto err;
2608                                 }
2609                         }
2610 
2611                         /* ipsec is not expecting ll header */
2612                         skb_pull(skb, ETH_HLEN);
2613                         ret = pktgen_output_ipsec(skb, pkt_dev);
2614                         if (ret) {
2615                                 pr_err("Error creating ipsec packet %d\n", ret);
2616                                 goto err;
2617                         }
2618                         /* restore ll */
2619                         eth = (__u8 *) skb_push(skb, ETH_HLEN);
2620                         memcpy(eth, pkt_dev->hh, 12);
2621                         *(u16 *) &eth[12] = protocol;
2622 
2623                         /* Update IPv4 header len as well as checksum value */
2624                         iph = ip_hdr(skb);
2625                         iph->tot_len = htons(skb->len - ETH_HLEN);
2626                         ip_send_check(iph);
2627                 }
2628         }
2629         return 1;
2630 err:
2631         kfree_skb(skb);
2632         return 0;
2633 }
2634 #endif
2635 
2636 static void mpls_push(__be32 *mpls, struct pktgen_dev *pkt_dev)
2637 {
2638         unsigned int i;
2639         for (i = 0; i < pkt_dev->nr_labels; i++)
2640                 *mpls++ = pkt_dev->labels[i] & ~MPLS_STACK_BOTTOM;
2641 
2642         mpls--;
2643         *mpls |= MPLS_STACK_BOTTOM;
2644 }
2645 
2646 static inline __be16 build_tci(unsigned int id, unsigned int cfi,
2647                                unsigned int prio)
2648 {
2649         return htons(id | (cfi << 12) | (prio << 13));
2650 }
2651 
2652 static void pktgen_finalize_skb(struct pktgen_dev *pkt_dev, struct sk_buff *skb,
2653                                 int datalen)
2654 {
2655         struct timeval timestamp;
2656         struct pktgen_hdr *pgh;
2657 
2658         pgh = (struct pktgen_hdr *)skb_put(skb, sizeof(*pgh));
2659         datalen -= sizeof(*pgh);
2660 
2661         if (pkt_dev->nfrags <= 0) {
2662                 memset(skb_put(skb, datalen), 0, datalen);
2663         } else {
2664                 int frags = pkt_dev->nfrags;
2665                 int i, len;
2666                 int frag_len;
2667 
2668 
2669                 if (frags > MAX_SKB_FRAGS)
2670                         frags = MAX_SKB_FRAGS;
2671                 len = datalen - frags * PAGE_SIZE;
2672                 if (len > 0) {
2673                         memset(skb_put(skb, len), 0, len);
2674                         datalen = frags * PAGE_SIZE;
2675                 }
2676 
2677                 i = 0;
2678                 frag_len = (datalen/frags) < PAGE_SIZE ?
2679                            (datalen/frags) : PAGE_SIZE;
2680                 while (datalen > 0) {
2681                         if (unlikely(!pkt_dev->page)) {
2682                                 int node = numa_node_id();
2683 
2684                                 if (pkt_dev->node >= 0 && (pkt_dev->flags & F_NODE))
2685                                         node = pkt_dev->node;
2686                                 pkt_dev->page = alloc_pages_node(node, GFP_KERNEL | __GFP_ZERO, 0);
2687                                 if (!pkt_dev->page)
2688                                         break;
2689                         }
2690                         get_page(pkt_dev->page);
2691                         skb_frag_set_page(skb, i, pkt_dev->page);
2692                         skb_shinfo(skb)->frags[i].page_offset = 0;
2693                         /*last fragment, fill rest of data*/
2694                         if (i == (frags - 1))
2695                                 skb_frag_size_set(&skb_shinfo(skb)->frags[i],
2696                                     (datalen < PAGE_SIZE ? datalen : PAGE_SIZE));
2697                         else
2698                                 skb_frag_size_set(&skb_shinfo(skb)->frags[i], frag_len);
2699                         datalen -= skb_frag_size(&skb_shinfo(skb)->frags[i]);
2700                         skb->len += skb_frag_size(&skb_shinfo(skb)->frags[i]);
2701                         skb->data_len += skb_frag_size(&skb_shinfo(skb)->frags[i]);
2702                         i++;
2703                         skb_shinfo(skb)->nr_frags = i;
2704                 }
2705         }
2706 
2707         /* Stamp the time, and sequence number,
2708          * convert them to network byte order
2709          */
2710         pgh->pgh_magic = htonl(PKTGEN_MAGIC);
2711         pgh->seq_num = htonl(pkt_dev->seq_num);
2712 
2713         if (pkt_dev->flags & F_NO_TIMESTAMP) {
2714                 pgh->tv_sec = 0;
2715                 pgh->tv_usec = 0;
2716         } else {
2717                 do_gettimeofday(&timestamp);
2718                 pgh->tv_sec = htonl(timestamp.tv_sec);
2719                 pgh->tv_usec = htonl(timestamp.tv_usec);
2720         }
2721 }
2722 
2723 static struct sk_buff *pktgen_alloc_skb(struct net_device *dev,
2724                                         struct pktgen_dev *pkt_dev,
2725                                         unsigned int extralen)
2726 {
2727         struct sk_buff *skb = NULL;
2728         unsigned int size = pkt_dev->cur_pkt_size + 64 + extralen +
2729                             pkt_dev->pkt_overhead;
2730 
2731         if (pkt_dev->flags & F_NODE) {
2732                 int node = pkt_dev->node >= 0 ? pkt_dev->node : numa_node_id();
2733 
2734                 skb = __alloc_skb(NET_SKB_PAD + size, GFP_NOWAIT, 0, node);
2735                 if (likely(skb)) {
2736                         skb_reserve(skb, NET_SKB_PAD);
2737                         skb->dev = dev;
2738                 }
2739         } else {
2740                  skb = __netdev_alloc_skb(dev, size, GFP_NOWAIT);
2741         }
2742 
2743         return skb;
2744 }
2745 
2746 static struct sk_buff *fill_packet_ipv4(struct net_device *odev,
2747                                         struct pktgen_dev *pkt_dev)
2748 {
2749         struct sk_buff *skb = NULL;
2750         __u8 *eth;
2751         struct udphdr *udph;
2752         int datalen, iplen;
2753         struct iphdr *iph;
2754         __be16 protocol = htons(ETH_P_IP);
2755         __be32 *mpls;
2756         __be16 *vlan_tci = NULL;                 /* Encapsulates priority and VLAN ID */
2757         __be16 *vlan_encapsulated_proto = NULL;  /* packet type ID field (or len) for VLAN tag */
2758         __be16 *svlan_tci = NULL;                /* Encapsulates priority and SVLAN ID */
2759         __be16 *svlan_encapsulated_proto = NULL; /* packet type ID field (or len) for SVLAN tag */
2760         u16 queue_map;
2761 
2762         if (pkt_dev->nr_labels)
2763                 protocol = htons(ETH_P_MPLS_UC);
2764 
2765         if (pkt_dev->vlan_id != 0xffff)
2766                 protocol = htons(ETH_P_8021Q);
2767 
2768         /* Update any of the values, used when we're incrementing various
2769          * fields.
2770          */
2771         mod_cur_headers(pkt_dev);
2772         queue_map = pkt_dev->cur_queue_map;
2773 
2774         datalen = (odev->hard_header_len + 16) & ~0xf;
2775 
2776         skb = pktgen_alloc_skb(odev, pkt_dev, datalen);
2777         if (!skb) {
2778                 sprintf(pkt_dev->result, "No memory");
2779                 return NULL;
2780         }
2781 
2782         prefetchw(skb->data);
2783         skb_reserve(skb, datalen);
2784 
2785         /*  Reserve for ethernet and IP header  */
2786         eth = (__u8 *) skb_push(skb, 14);
2787         mpls = (__be32 *)skb_put(skb, pkt_dev->nr_labels*sizeof(__u32));
2788         if (pkt_dev->nr_labels)
2789                 mpls_push(mpls, pkt_dev);
2790 
2791         if (pkt_dev->vlan_id != 0xffff) {
2792                 if (pkt_dev->svlan_id != 0xffff) {
2793                         svlan_tci = (__be16 *)skb_put(skb, sizeof(__be16));
2794                         *svlan_tci = build_tci(pkt_dev->svlan_id,
2795                                                pkt_dev->svlan_cfi,
2796                                                pkt_dev->svlan_p);
2797                         svlan_encapsulated_proto = (__be16 *)skb_put(skb, sizeof(__be16));
2798                         *svlan_encapsulated_proto = htons(ETH_P_8021Q);
2799                 }
2800                 vlan_tci = (__be16 *)skb_put(skb, sizeof(__be16));
2801                 *vlan_tci = build_tci(pkt_dev->vlan_id,
2802                                       pkt_dev->vlan_cfi,
2803                                       pkt_dev->vlan_p);
2804                 vlan_encapsulated_proto = (__be16 *)skb_put(skb, sizeof(__be16));
2805                 *vlan_encapsulated_proto = htons(ETH_P_IP);
2806         }
2807 
2808         skb_set_mac_header(skb, 0);
2809         skb_set_network_header(skb, skb->len);
2810         iph = (struct iphdr *) skb_put(skb, sizeof(struct iphdr));
2811 
2812         skb_set_transport_header(skb, skb->len);
2813         udph = (struct udphdr *) skb_put(skb, sizeof(struct udphdr));
2814         skb_set_queue_mapping(skb, queue_map);
2815         skb->priority = pkt_dev->skb_priority;
2816 
2817         memcpy(eth, pkt_dev->hh, 12);
2818         *(__be16 *) & eth[12] = protocol;
2819 
2820         /* Eth + IPh + UDPh + mpls */
2821         datalen = pkt_dev->cur_pkt_size - 14 - 20 - 8 -
2822                   pkt_dev->pkt_overhead;
2823         if (datalen < 0 || datalen < sizeof(struct pktgen_hdr))
2824                 datalen = sizeof(struct pktgen_hdr);
2825 
2826         udph->source = htons(pkt_dev->cur_udp_src);
2827         udph->dest = htons(pkt_dev->cur_udp_dst);
2828         udph->len = htons(datalen + 8); /* DATA + udphdr */
2829         udph->check = 0;
2830 
2831         iph->ihl = 5;
2832         iph->version = 4;
2833         iph->ttl = 32;
2834         iph->tos = pkt_dev->tos;
2835         iph->protocol = IPPROTO_UDP;    /* UDP */
2836         iph->saddr = pkt_dev->cur_saddr;
2837         iph->daddr = pkt_dev->cur_daddr;
2838         iph->id = htons(pkt_dev->ip_id);
2839         pkt_dev->ip_id++;
2840         iph->frag_off = 0;
2841         iplen = 20 + 8 + datalen;
2842         iph->tot_len = htons(iplen);
2843         ip_send_check(iph);
2844         skb->protocol = protocol;
2845         skb->dev = odev;
2846         skb->pkt_type = PACKET_HOST;
2847 
2848         pktgen_finalize_skb(pkt_dev, skb, datalen);
2849 
2850         if (!(pkt_dev->flags & F_UDPCSUM)) {
2851                 skb->ip_summed = CHECKSUM_NONE;
2852         } else if (odev->features & NETIF_F_V4_CSUM) {
2853                 skb->ip_summed = CHECKSUM_PARTIAL;
2854                 skb->csum = 0;
2855                 udp4_hwcsum(skb, iph->saddr, iph->daddr);
2856         } else {
2857                 __wsum csum = skb_checksum(skb, skb_transport_offset(skb), datalen + 8, 0);
2858 
2859                 /* add protocol-dependent pseudo-header */
2860                 udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
2861                                                 datalen + 8, IPPROTO_UDP, csum);
2862 
2863                 if (udph->check == 0)
2864                         udph->check = CSUM_MANGLED_0;
2865         }
2866 
2867 #ifdef CONFIG_XFRM
2868         if (!process_ipsec(pkt_dev, skb, protocol))
2869                 return NULL;
2870 #endif
2871 
2872         return skb;
2873 }
2874 
2875 static struct sk_buff *fill_packet_ipv6(struct net_device *odev,
2876                                         struct pktgen_dev *pkt_dev)
2877 {
2878         struct sk_buff *skb = NULL;
2879         __u8 *eth;
2880         struct udphdr *udph;
2881         int datalen, udplen;
2882         struct ipv6hdr *iph;
2883         __be16 protocol = htons(ETH_P_IPV6);
2884         __be32 *mpls;
2885         __be16 *vlan_tci = NULL;                 /* Encapsulates priority and VLAN ID */
2886         __be16 *vlan_encapsulated_proto = NULL;  /* packet type ID field (or len) for VLAN tag */
2887         __be16 *svlan_tci = NULL;                /* Encapsulates priority and SVLAN ID */
2888         __be16 *svlan_encapsulated_proto = NULL; /* packet type ID field (or len) for SVLAN tag */
2889         u16 queue_map;
2890 
2891         if (pkt_dev->nr_labels)
2892                 protocol = htons(ETH_P_MPLS_UC);
2893 
2894         if (pkt_dev->vlan_id != 0xffff)
2895                 protocol = htons(ETH_P_8021Q);
2896 
2897         /* Update any of the values, used when we're incrementing various
2898          * fields.
2899          */
2900         mod_cur_headers(pkt_dev);
2901         queue_map = pkt_dev->cur_queue_map;
2902 
2903         skb = pktgen_alloc_skb(odev, pkt_dev, 16);
2904         if (!skb) {
2905                 sprintf(pkt_dev->result, "No memory");
2906                 return NULL;
2907         }
2908 
2909         prefetchw(skb->data);
2910         skb_reserve(skb, 16);
2911 
2912         /*  Reserve for ethernet and IP header  */
2913         eth = (__u8 *) skb_push(skb, 14);
2914         mpls = (__be32 *)skb_put(skb, pkt_dev->nr_labels*sizeof(__u32));
2915         if (pkt_dev->nr_labels)
2916                 mpls_push(mpls, pkt_dev);
2917 
2918         if (pkt_dev->vlan_id != 0xffff) {
2919                 if (pkt_dev->svlan_id != 0xffff) {
2920                         svlan_tci = (__be16 *)skb_put(skb, sizeof(__be16));
2921                         *svlan_tci = build_tci(pkt_dev->svlan_id,
2922                                                pkt_dev->svlan_cfi,
2923                                                pkt_dev->svlan_p);
2924                         svlan_encapsulated_proto = (__be16 *)skb_put(skb, sizeof(__be16));
2925                         *svlan_encapsulated_proto = htons(ETH_P_8021Q);
2926                 }
2927                 vlan_tci = (__be16 *)skb_put(skb, sizeof(__be16));
2928                 *vlan_tci = build_tci(pkt_dev->vlan_id,
2929                                       pkt_dev->vlan_cfi,
2930                                       pkt_dev->vlan_p);
2931                 vlan_encapsulated_proto = (__be16 *)skb_put(skb, sizeof(__be16));
2932                 *vlan_encapsulated_proto = htons(ETH_P_IPV6);
2933         }
2934 
2935         skb_set_mac_header(skb, 0);
2936         skb_set_network_header(skb, skb->len);
2937         iph = (struct ipv6hdr *) skb_put(skb, sizeof(struct ipv6hdr));
2938 
2939         skb_set_transport_header(skb, skb->len);
2940         udph = (struct udphdr *) skb_put(skb, sizeof(struct udphdr));
2941         skb_set_queue_mapping(skb, queue_map);
2942         skb->priority = pkt_dev->skb_priority;
2943 
2944         memcpy(eth, pkt_dev->hh, 12);
2945         *(__be16 *) &eth[12] = protocol;
2946 
2947         /* Eth + IPh + UDPh + mpls */
2948         datalen = pkt_dev->cur_pkt_size - 14 -
2949                   sizeof(struct ipv6hdr) - sizeof(struct udphdr) -
2950                   pkt_dev->pkt_overhead;
2951 
2952         if (datalen < 0 || datalen < sizeof(struct pktgen_hdr)) {
2953                 datalen = sizeof(struct pktgen_hdr);
2954                 net_info_ratelimited("increased datalen to %d\n", datalen);
2955         }
2956 
2957         udplen = datalen + sizeof(struct udphdr);
2958         udph->source = htons(pkt_dev->cur_udp_src);
2959         udph->dest = htons(pkt_dev->cur_udp_dst);
2960         udph->len = htons(udplen);
2961         udph->check = 0;
2962 
2963         *(__be32 *) iph = htonl(0x60000000);    /* Version + flow */
2964 
2965         if (pkt_dev->traffic_class) {
2966                 /* Version + traffic class + flow (0) */
2967                 *(__be32 *)iph |= htonl(0x60000000 | (pkt_dev->traffic_class << 20));
2968         }
2969 
2970         iph->hop_limit = 32;
2971 
2972         iph->payload_len = htons(udplen);
2973         iph->nexthdr = IPPROTO_UDP;
2974 
2975         iph->daddr = pkt_dev->cur_in6_daddr;
2976         iph->saddr = pkt_dev->cur_in6_saddr;
2977 
2978         skb->protocol = protocol;
2979         skb->dev = odev;
2980         skb->pkt_type = PACKET_HOST;
2981 
2982         pktgen_finalize_skb(pkt_dev, skb, datalen);
2983 
2984         if (!(pkt_dev->flags & F_UDPCSUM)) {
2985                 skb->ip_summed = CHECKSUM_NONE;
2986         } else if (odev->features & NETIF_F_V6_CSUM) {
2987                 skb->ip_summed = CHECKSUM_PARTIAL;
2988                 skb->csum_start = skb_transport_header(skb) - skb->head;
2989                 skb->csum_offset = offsetof(struct udphdr, check);
2990                 udph->check = ~csum_ipv6_magic(&iph->saddr, &iph->daddr, udplen, IPPROTO_UDP, 0);
2991         } else {
2992                 __wsum csum = skb_checksum(skb, skb_transport_offset(skb), udplen, 0);
2993 
2994                 /* add protocol-dependent pseudo-header */
2995                 udph->check = csum_ipv6_magic(&iph->saddr, &iph->daddr, udplen, IPPROTO_UDP, csum);
2996 
2997                 if (udph->check == 0)
2998                         udph->check = CSUM_MANGLED_0;
2999         }
3000 
3001         return skb;
3002 }
3003 
3004 static struct sk_buff *fill_packet(struct net_device *odev,
3005                                    struct pktgen_dev *pkt_dev)
3006 {
3007         if (pkt_dev->flags & F_IPV6)
3008                 return fill_packet_ipv6(odev, pkt_dev);
3009         else
3010                 return fill_packet_ipv4(odev, pkt_dev);
3011 }
3012 
3013 static void pktgen_clear_counters(struct pktgen_dev *pkt_dev)
3014 {
3015         pkt_dev->seq_num = 1;
3016         pkt_dev->idle_acc = 0;
3017         pkt_dev->sofar = 0;
3018         pkt_dev->tx_bytes = 0;
3019         pkt_dev->errors = 0;
3020 }
3021 
3022 /* Set up structure for sending pkts, clear counters */
3023 
3024 static void pktgen_run(struct pktgen_thread *t)
3025 {
3026         struct pktgen_dev *pkt_dev;
3027         int started = 0;
3028 
3029         func_enter();
3030 
3031         rcu_read_lock();
3032         list_for_each_entry_rcu(pkt_dev, &t->if_list, list) {
3033 
3034                 /*
3035                  * setup odev and create initial packet.
3036                  */
3037                 pktgen_setup_inject(pkt_dev);
3038 
3039                 if (pkt_dev->odev) {
3040                         pktgen_clear_counters(pkt_dev);
3041                         pkt_dev->skb = NULL;
3042                         pkt_dev->started_at = pkt_dev->next_tx = ktime_get();
3043 
3044                         set_pkt_overhead(pkt_dev);
3045 
3046                         strcpy(pkt_dev->result, "Starting");
3047                         pkt_dev->running = 1;   /* Cranke yeself! */
3048                         started++;
3049                 } else
3050                         strcpy(pkt_dev->result, "Error starting");
3051         }
3052         rcu_read_unlock();
3053         if (started)
3054                 t->control &= ~(T_STOP);
3055 }
3056 
3057 static void pktgen_stop_all_threads_ifs(struct pktgen_net *pn)
3058 {
3059         struct pktgen_thread *t;
3060 
3061         func_enter();
3062 
3063         mutex_lock(&pktgen_thread_lock);
3064 
3065         list_for_each_entry(t, &pn->pktgen_threads, th_list)
3066                 t->control |= T_STOP;
3067 
3068         mutex_unlock(&pktgen_thread_lock);
3069 }
3070 
3071 static int thread_is_running(const struct pktgen_thread *t)
3072 {
3073         const struct pktgen_dev *pkt_dev;
3074 
3075         rcu_read_lock();
3076         list_for_each_entry_rcu(pkt_dev, &t->if_list, list)
3077                 if (pkt_dev->running) {
3078                         rcu_read_unlock();
3079                         return 1;
3080                 }
3081         rcu_read_unlock();
3082         return 0;
3083 }
3084 
3085 static int pktgen_wait_thread_run(struct pktgen_thread *t)
3086 {
3087         while (thread_is_running(t)) {
3088 
3089                 msleep_interruptible(100);
3090 
3091                 if (signal_pending(current))
3092                         goto signal;
3093         }
3094         return 1;
3095 signal:
3096         return 0;
3097 }
3098 
3099 static int pktgen_wait_all_threads_run(struct pktgen_net *pn)
3100 {
3101         struct pktgen_thread *t;
3102         int sig = 1;
3103 
3104         mutex_lock(&pktgen_thread_lock);
3105 
3106         list_for_each_entry(t, &pn->pktgen_threads, th_list) {
3107                 sig = pktgen_wait_thread_run(t);
3108                 if (sig == 0)
3109                         break;
3110         }
3111 
3112         if (sig == 0)
3113                 list_for_each_entry(t, &pn->pktgen_threads, th_list)
3114                         t->control |= (T_STOP);
3115 
3116         mutex_unlock(&pktgen_thread_lock);
3117         return sig;
3118 }
3119 
3120 static void pktgen_run_all_threads(struct pktgen_net *pn)
3121 {
3122         struct pktgen_thread *t;
3123 
3124         func_enter();
3125 
3126         mutex_lock(&pktgen_thread_lock);
3127 
3128         list_for_each_entry(t, &pn->pktgen_threads, th_list)
3129                 t->control |= (T_RUN);
3130 
3131         mutex_unlock(&pktgen_thread_lock);
3132 
3133         /* Propagate thread->control  */
3134         schedule_timeout_interruptible(msecs_to_jiffies(125));
3135 
3136         pktgen_wait_all_threads_run(pn);
3137 }
3138 
3139 static void pktgen_reset_all_threads(struct pktgen_net *pn)
3140 {
3141         struct pktgen_thread *t;
3142 
3143         func_enter();
3144 
3145         mutex_lock(&pktgen_thread_lock);
3146 
3147         list_for_each_entry(t, &pn->pktgen_threads, th_list)
3148                 t->control |= (T_REMDEVALL);
3149 
3150         mutex_unlock(&pktgen_thread_lock);
3151 
3152         /* Propagate thread->control  */
3153         schedule_timeout_interruptible(msecs_to_jiffies(125));
3154 
3155         pktgen_wait_all_threads_run(pn);
3156 }
3157 
3158 static void show_results(struct pktgen_dev *pkt_dev, int nr_frags)
3159 {
3160         __u64 bps, mbps, pps;
3161         char *p = pkt_dev->result;
3162         ktime_t elapsed = ktime_sub(pkt_dev->stopped_at,
3163                                     pkt_dev->started_at);
3164         ktime_t idle = ns_to_ktime(pkt_dev->idle_acc);
3165 
3166         p += sprintf(p, "OK: %llu(c%llu+d%llu) usec, %llu (%dbyte,%dfrags)\n",
3167                      (unsigned long long)ktime_to_us(elapsed),
3168                      (unsigned long long)ktime_to_us(ktime_sub(elapsed, idle)),
3169                      (unsigned long long)ktime_to_us(idle),
3170                      (unsigned long long)pkt_dev->sofar,
3171                      pkt_dev->cur_pkt_size, nr_frags);
3172 
3173         pps = div64_u64(pkt_dev->sofar * NSEC_PER_SEC,
3174                         ktime_to_ns(elapsed));
3175 
3176         bps = pps * 8 * pkt_dev->cur_pkt_size;
3177 
3178         mbps = bps;
3179         do_div(mbps, 1000000);
3180         p += sprintf(p, "  %llupps %lluMb/sec (%llubps) errors: %llu",
3181                      (unsigned long long)pps,
3182                      (unsigned long long)mbps,
3183                      (unsigned long long)bps,
3184                      (unsigned long long)pkt_dev->errors);
3185 }
3186 
3187 /* Set stopped-at timer, remove from running list, do counters & statistics */
3188 static int pktgen_stop_device(struct pktgen_dev *pkt_dev)
3189 {
3190         int nr_frags = pkt_dev->skb ? skb_shinfo(pkt_dev->skb)->nr_frags : -1;
3191 
3192         if (!pkt_dev->running) {
3193                 pr_warn("interface: %s is already stopped\n",
3194                         pkt_dev->odevname);
3195                 return -EINVAL;
3196         }
3197 
3198         pkt_dev->running = 0;
3199         kfree_skb(pkt_dev->skb);
3200         pkt_dev->skb = NULL;
3201         pkt_dev->stopped_at = ktime_get();
3202 
3203         show_results(pkt_dev, nr_frags);
3204 
3205         return 0;
3206 }
3207 
3208 static struct pktgen_dev *next_to_run(struct pktgen_thread *t)
3209 {
3210         struct pktgen_dev *pkt_dev, *best = NULL;
3211 
3212         rcu_read_lock();
3213         list_for_each_entry_rcu(pkt_dev, &t->if_list, list) {
3214                 if (!pkt_dev->running)
3215                         continue;
3216                 if (best == NULL)
3217                         best = pkt_dev;
3218                 else if (ktime_compare(pkt_dev->next_tx, best->next_tx) < 0)
3219                         best = pkt_dev;
3220         }
3221         rcu_read_unlock();
3222 
3223         return best;
3224 }
3225 
3226 static void pktgen_stop(struct pktgen_thread *t)
3227 {
3228         struct pktgen_dev *pkt_dev;
3229 
3230         func_enter();
3231 
3232         rcu_read_lock();
3233 
3234         list_for_each_entry_rcu(pkt_dev, &t->if_list, list) {
3235                 pktgen_stop_device(pkt_dev);
3236         }
3237 
3238         rcu_read_unlock();
3239 }
3240 
3241 /*
3242  * one of our devices needs to be removed - find it
3243  * and remove it
3244  */
3245 static void pktgen_rem_one_if(struct pktgen_thread *t)
3246 {
3247         struct list_head *q, *n;
3248         struct pktgen_dev *cur;
3249 
3250         func_enter();
3251 
3252         list_for_each_safe(q, n, &t->if_list) {
3253                 cur = list_entry(q, struct pktgen_dev, list);
3254 
3255                 if (!cur->removal_mark)
3256                         continue;
3257 
3258                 kfree_skb(cur->skb);
3259                 cur->skb = NULL;
3260 
3261                 pktgen_remove_device(t, cur);
3262 
3263                 break;
3264         }
3265 }
3266 
3267 static void pktgen_rem_all_ifs(struct pktgen_thread *t)
3268 {
3269         struct list_head *q, *n;
3270         struct pktgen_dev *cur;
3271 
3272         func_enter();
3273 
3274         /* Remove all devices, free mem */
3275 
3276         list_for_each_safe(q, n, &t->if_list) {
3277                 cur = list_entry(q, struct pktgen_dev, list);
3278 
3279                 kfree_skb(cur->skb);
3280                 cur->skb = NULL;
3281 
3282                 pktgen_remove_device(t, cur);
3283         }
3284 }
3285 
3286 static void pktgen_rem_thread(struct pktgen_thread *t)
3287 {
3288         /* Remove from the thread list */
3289         remove_proc_entry(t->tsk->comm, t->net->proc_dir);
3290 }
3291 
3292 static void pktgen_resched(struct pktgen_dev *pkt_dev)
3293 {
3294         ktime_t idle_start = ktime_get();
3295         schedule();
3296         pkt_dev->idle_acc += ktime_to_ns(ktime_sub(ktime_get(), idle_start));
3297 }
3298 
3299 static void pktgen_wait_for_skb(struct pktgen_dev *pkt_dev)
3300 {
3301         ktime_t idle_start = ktime_get();
3302 
3303         while (atomic_read(&(pkt_dev->skb->users)) != 1) {
3304                 if (signal_pending(current))
3305                         break;
3306 
3307                 if (need_resched())
3308                         pktgen_resched(pkt_dev);
3309                 else
3310                         cpu_relax();
3311         }
3312         pkt_dev->idle_acc += ktime_to_ns(ktime_sub(ktime_get(), idle_start));
3313 }
3314 
3315 static void pktgen_xmit(struct pktgen_dev *pkt_dev)
3316 {
3317         unsigned int burst = ACCESS_ONCE(pkt_dev->burst);
3318         struct net_device *odev = pkt_dev->odev;
3319         struct netdev_queue *txq;
3320         int ret;
3321 
3322         /* If device is offline, then don't send */
3323         if (unlikely(!netif_running(odev) || !netif_carrier_ok(odev))) {
3324                 pktgen_stop_device(pkt_dev);
3325                 return;
3326         }
3327 
3328         /* This is max DELAY, this has special meaning of
3329          * "never transmit"
3330          */
3331         if (unlikely(pkt_dev->delay == ULLONG_MAX)) {
3332                 pkt_dev->next_tx = ktime_add_ns(ktime_get(), ULONG_MAX);
3333                 return;
3334         }
3335 
3336         /* If no skb or clone count exhausted then get new one */
3337         if (!pkt_dev->skb || (pkt_dev->last_ok &&
3338                               ++pkt_dev->clone_count >= pkt_dev->clone_skb)) {
3339                 /* build a new pkt */
3340                 kfree_skb(pkt_dev->skb);
3341 
3342                 pkt_dev->skb = fill_packet(odev, pkt_dev);
3343                 if (pkt_dev->skb == NULL) {
3344                         pr_err("ERROR: couldn't allocate skb in fill_packet\n");
3345                         schedule();
3346                         pkt_dev->clone_count--; /* back out increment, OOM */
3347                         return;
3348                 }
3349                 pkt_dev->last_pkt_size = pkt_dev->skb->len;
3350                 pkt_dev->allocated_skbs++;
3351                 pkt_dev->clone_count = 0;       /* reset counter */
3352         }
3353 
3354         if (pkt_dev->delay && pkt_dev->last_ok)
3355                 spin(pkt_dev, pkt_dev->next_tx);
3356 
3357         txq = skb_get_tx_queue(odev, pkt_dev->skb);
3358 
3359         local_bh_disable();
3360 
3361         HARD_TX_LOCK(odev, txq, smp_processor_id());
3362 
3363         if (unlikely(netif_xmit_frozen_or_drv_stopped(txq))) {
3364                 ret = NETDEV_TX_BUSY;
3365                 pkt_dev->last_ok = 0;
3366                 goto unlock;
3367         }
3368         atomic_add(burst, &pkt_dev->skb->users);
3369 
3370 xmit_more:
3371         ret = netdev_start_xmit(pkt_dev->skb, odev, txq, --burst > 0);
3372 
3373         switch (ret) {
3374         case NETDEV_TX_OK:
3375                 pkt_dev->last_ok = 1;
3376                 pkt_dev->sofar++;
3377                 pkt_dev->seq_num++;
3378                 pkt_dev->tx_bytes += pkt_dev->last_pkt_size;
3379                 if (burst > 0 && !netif_xmit_frozen_or_drv_stopped(txq))
3380                         goto xmit_more;
3381                 break;
3382         case NET_XMIT_DROP:
3383         case NET_XMIT_CN:
3384         case NET_XMIT_POLICED:
3385                 /* skb has been consumed */
3386                 pkt_dev->errors++;
3387                 break;
3388         default: /* Drivers are not supposed to return other values! */
3389                 net_info_ratelimited("%s xmit error: %d\n",
3390                                      pkt_dev->odevname, ret);
3391                 pkt_dev->errors++;
3392                 /* fallthru */
3393         case NETDEV_TX_LOCKED:
3394         case NETDEV_TX_BUSY:
3395                 /* Retry it next time */
3396                 atomic_dec(&(pkt_dev->skb->users));
3397                 pkt_dev->last_ok = 0;
3398         }
3399         if (unlikely(burst))
3400                 atomic_sub(burst, &pkt_dev->skb->users);
3401 unlock:
3402         HARD_TX_UNLOCK(odev, txq);
3403 
3404         local_bh_enable();
3405 
3406         /* If pkt_dev->count is zero, then run forever */
3407         if ((pkt_dev->count != 0) && (pkt_dev->sofar >= pkt_dev->count)) {
3408                 pktgen_wait_for_skb(pkt_dev);
3409 
3410                 /* Done with this */
3411                 pktgen_stop_device(pkt_dev);
3412         }
3413 }
3414 
3415 /*
3416  * Main loop of the thread goes here
3417  */
3418 
3419 static int pktgen_thread_worker(void *arg)
3420 {
3421         DEFINE_WAIT(wait);
3422         struct pktgen_thread *t = arg;
3423         struct pktgen_dev *pkt_dev = NULL;
3424         int cpu = t->cpu;
3425 
3426         BUG_ON(smp_processor_id() != cpu);
3427 
3428         init_waitqueue_head(&t->queue);
3429         complete(&t->start_done);
3430 
3431         pr_debug("starting pktgen/%d:  pid=%d\n", cpu, task_pid_nr(current));
3432 
3433         set_freezable();
3434 
3435         __set_current_state(TASK_RUNNING);
3436 
3437         while (!kthread_should_stop()) {
3438                 pkt_dev = next_to_run(t);
3439 
3440                 if (unlikely(!pkt_dev && t->control == 0)) {
3441                         if (t->net->pktgen_exiting)
3442                                 break;
3443                         wait_event_interruptible_timeout(t->queue,
3444                                                          t->control != 0,
3445                                                          HZ/10);
3446                         try_to_freeze();
3447                         continue;
3448                 }
3449 
3450                 if (likely(pkt_dev)) {
3451                         pktgen_xmit(pkt_dev);
3452 
3453                         if (need_resched())
3454                                 pktgen_resched(pkt_dev);
3455                         else
3456                                 cpu_relax();
3457                 }
3458 
3459                 if (t->control & T_STOP) {
3460                         pktgen_stop(t);
3461                         t->control &= ~(T_STOP);
3462                 }
3463 
3464                 if (t->control & T_RUN) {
3465                         pktgen_run(t);
3466                         t->control &= ~(T_RUN);
3467                 }
3468 
3469                 if (t->control & T_REMDEVALL) {
3470                         pktgen_rem_all_ifs(t);
3471                         t->control &= ~(T_REMDEVALL);
3472                 }
3473 
3474                 if (t->control & T_REMDEV) {
3475                         pktgen_rem_one_if(t);
3476                         t->control &= ~(T_REMDEV);
3477                 }
3478 
3479                 try_to_freeze();
3480         }
3481         set_current_state(TASK_INTERRUPTIBLE);
3482 
3483         pr_debug("%s stopping all device\n", t->tsk->comm);
3484         pktgen_stop(t);
3485 
3486         pr_debug("%s removing all device\n", t->tsk->comm);
3487         pktgen_rem_all_ifs(t);
3488 
3489         pr_debug("%s removing thread\n", t->tsk->comm);
3490         pktgen_rem_thread(t);
3491 
3492         /* Wait for kthread_stop */
3493         while (!kthread_should_stop()) {
3494                 set_current_state(TASK_INTERRUPTIBLE);
3495                 schedule();
3496         }
3497         __set_current_state(TASK_RUNNING);
3498 
3499         return 0;
3500 }
3501 
3502 static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t,
3503                                           const char *ifname, bool exact)
3504 {
3505         struct pktgen_dev *p, *pkt_dev = NULL;
3506         size_t len = strlen(ifname);
3507 
3508         rcu_read_lock();
3509         list_for_each_entry_rcu(p, &t->if_list, list)
3510                 if (strncmp(p->odevname, ifname, len) == 0) {
3511                         if (p->odevname[len]) {
3512                                 if (exact || p->odevname[len] != '@')
3513                                         continue;
3514                         }
3515                         pkt_dev = p;
3516                         break;
3517                 }
3518 
3519         rcu_read_unlock();
3520         pr_debug("find_dev(%s) returning %p\n", ifname, pkt_dev);
3521         return pkt_dev;
3522 }
3523 
3524 /*
3525  * Adds a dev at front of if_list.
3526  */
3527 
3528 static int add_dev_to_thread(struct pktgen_thread *t,
3529                              struct pktgen_dev *pkt_dev)
3530 {
3531         int rv = 0;
3532 
3533         /* This function cannot be called concurrently, as its called
3534          * under pktgen_thread_lock mutex, but it can run from
3535          * userspace on another CPU than the kthread.  The if_lock()
3536          * is used here to sync with concurrent instances of
3537          * _rem_dev_from_if_list() invoked via kthread, which is also
3538          * updating the if_list */
3539         if_lock(t);
3540 
3541         if (pkt_dev->pg_thread) {
3542                 pr_err("ERROR: already assigned to a thread\n");
3543                 rv = -EBUSY;
3544                 goto out;
3545         }
3546 
3547         pkt_dev->running = 0;
3548         pkt_dev->pg_thread = t;
3549         list_add_rcu(&pkt_dev->list, &t->if_list);
3550 
3551 out:
3552         if_unlock(t);
3553         return rv;
3554 }
3555 
3556 /* Called under thread lock */
3557 
3558 static int pktgen_add_device(struct pktgen_thread *t, const char *ifname)
3559 {
3560         struct pktgen_dev *pkt_dev;
3561         int err;
3562         int node = cpu_to_node(t->cpu);
3563 
3564         /* We don't allow a device to be on several threads */
3565 
3566         pkt_dev = __pktgen_NN_threads(t->net, ifname, FIND);
3567         if (pkt_dev) {
3568                 pr_err("ERROR: interface already used\n");
3569                 return -EBUSY;
3570         }
3571 
3572         pkt_dev = kzalloc_node(sizeof(struct pktgen_dev), GFP_KERNEL, node);
3573         if (!pkt_dev)
3574                 return -ENOMEM;
3575 
3576         strcpy(pkt_dev->odevname, ifname);
3577         pkt_dev->flows = vzalloc_node(MAX_CFLOWS * sizeof(struct flow_state),
3578                                       node);
3579         if (pkt_dev->flows == NULL) {
3580                 kfree(pkt_dev);
3581                 return -ENOMEM;
3582         }
3583 
3584         pkt_dev->removal_mark = 0;
3585         pkt_dev->nfrags = 0;
3586         pkt_dev->delay = pg_delay_d;
3587         pkt_dev->count = pg_count_d;
3588         pkt_dev->sofar = 0;
3589         pkt_dev->udp_src_min = 9;       /* sink port */
3590         pkt_dev->udp_src_max = 9;
3591         pkt_dev->udp_dst_min = 9;
3592         pkt_dev->udp_dst_max = 9;
3593         pkt_dev->vlan_p = 0;
3594         pkt_dev->vlan_cfi = 0;
3595         pkt_dev->vlan_id = 0xffff;
3596         pkt_dev->svlan_p = 0;
3597         pkt_dev->svlan_cfi = 0;
3598         pkt_dev->svlan_id = 0xffff;
3599         pkt_dev->burst = 1;
3600         pkt_dev->node = -1;
3601 
3602         err = pktgen_setup_dev(t->net, pkt_dev, ifname);
3603         if (err)
3604                 goto out1;
3605         if (pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)
3606                 pkt_dev->clone_skb = pg_clone_skb_d;
3607 
3608         pkt_dev->entry = proc_create_data(ifname, 0600, t->net->proc_dir,
3609                                           &pktgen_if_fops, pkt_dev);
3610         if (!pkt_dev->entry) {
3611                 pr_err("cannot create %s/%s procfs entry\n",
3612                        PG_PROC_DIR, ifname);
3613                 err = -EINVAL;
3614                 goto out2;
3615         }
3616 #ifdef CONFIG_XFRM
3617         pkt_dev->ipsmode = XFRM_MODE_TRANSPORT;
3618         pkt_dev->ipsproto = IPPROTO_ESP;
3619 
3620         /* xfrm tunnel mode needs additional dst to extract outter
3621          * ip header protocol/ttl/id field, here creat a phony one.
3622          * instead of looking for a valid rt, which definitely hurting
3623          * performance under such circumstance.
3624          */
3625         pkt_dev->dstops.family = AF_INET;
3626         pkt_dev->dst.dev = pkt_dev->odev;
3627         dst_init_metrics(&pkt_dev->dst, pktgen_dst_metrics, false);
3628         pkt_dev->dst.child = &pkt_dev->dst;
3629         pkt_dev->dst.ops = &pkt_dev->dstops;
3630 #endif
3631 
3632         return add_dev_to_thread(t, pkt_dev);
3633 out2:
3634         dev_put(pkt_dev->odev);
3635 out1:
3636 #ifdef CONFIG_XFRM
3637         free_SAs(pkt_dev);
3638 #endif
3639         vfree(pkt_dev->flows);
3640         kfree(pkt_dev);
3641         return err;
3642 }
3643 
3644 static int __net_init pktgen_create_thread(int cpu, struct pktgen_net *pn)
3645 {
3646         struct pktgen_thread *t;
3647         struct proc_dir_entry *pe;
3648         struct task_struct *p;
3649 
3650         t = kzalloc_node(sizeof(struct pktgen_thread), GFP_KERNEL,
3651                          cpu_to_node(cpu));
3652         if (!t) {
3653                 pr_err("ERROR: out of memory, can't create new thread\n");
3654                 return -ENOMEM;
3655         }
3656 
3657         spin_lock_init(&t->if_lock);
3658         t->cpu = cpu;
3659 
3660         INIT_LIST_HEAD(&t->if_list);
3661 
3662         list_add_tail(&t->th_list, &pn->pktgen_threads);
3663         init_completion(&t->start_done);
3664 
3665         p = kthread_create_on_node(pktgen_thread_worker,
3666                                    t,
3667                                    cpu_to_node(cpu),
3668                                    "kpktgend_%d", cpu);
3669         if (IS_ERR(p)) {
3670                 pr_err("kernel_thread() failed for cpu %d\n", t->cpu);
3671                 list_del(&t->th_list);
3672                 kfree(t);
3673                 return PTR_ERR(p);
3674         }
3675         kthread_bind(p, cpu);
3676         t->tsk = p;
3677 
3678         pe = proc_create_data(t->tsk->comm, 0600, pn->proc_dir,
3679                               &pktgen_thread_fops, t);
3680         if (!pe) {
3681                 pr_err("cannot create %s/%s procfs entry\n",
3682                        PG_PROC_DIR, t->tsk->comm);
3683                 kthread_stop(p);
3684                 list_del(&t->th_list);
3685                 kfree(t);
3686                 return -EINVAL;
3687         }
3688 
3689         t->net = pn;
3690         wake_up_process(p);
3691         wait_for_completion(&t->start_done);
3692 
3693         return 0;
3694 }
3695 
3696 /*
3697  * Removes a device from the thread if_list.
3698  */
3699 static void _rem_dev_from_if_list(struct pktgen_thread *t,
3700                                   struct pktgen_dev *pkt_dev)
3701 {
3702         struct list_head *q, *n;
3703         struct pktgen_dev *p;
3704 
3705         if_lock(t);
3706         list_for_each_safe(q, n, &t->if_list) {
3707                 p = list_entry(q, struct pktgen_dev, list);
3708                 if (p == pkt_dev)
3709                         list_del_rcu(&p->list);
3710         }
3711         if_unlock(t);
3712 }
3713 
3714 static int pktgen_remove_device(struct pktgen_thread *t,
3715                                 struct pktgen_dev *pkt_dev)
3716 {
3717         pr_debug("remove_device pkt_dev=%p\n", pkt_dev);
3718 
3719         if (pkt_dev->running) {
3720                 pr_warn("WARNING: trying to remove a running interface, stopping it now\n");
3721                 pktgen_stop_device(pkt_dev);
3722         }
3723 
3724         /* Dis-associate from the interface */
3725 
3726         if (pkt_dev->odev) {
3727                 dev_put(pkt_dev->odev);
3728                 pkt_dev->odev = NULL;
3729         }
3730 
3731         /* Remove proc before if_list entry, because add_device uses
3732          * list to determine if interface already exist, avoid race
3733          * with proc_create_data() */
3734         proc_remove(pkt_dev->entry);
3735 
3736         /* And update the thread if_list */
3737         _rem_dev_from_if_list(t, pkt_dev);
3738 
3739 #ifdef CONFIG_XFRM
3740         free_SAs(pkt_dev);
3741 #endif
3742         vfree(pkt_dev->flows);
3743         if (pkt_dev->page)
3744                 put_page(pkt_dev->page);
3745         kfree_rcu(pkt_dev, rcu);
3746         return 0;
3747 }
3748 
3749 static int __net_init pg_net_init(struct net *net)
3750 {
3751         struct pktgen_net *pn = net_generic(net, pg_net_id);
3752         struct proc_dir_entry *pe;
3753         int cpu, ret = 0;
3754 
3755         pn->net = net;
3756         INIT_LIST_HEAD(&pn->pktgen_threads);
3757         pn->pktgen_exiting = false;
3758         pn->proc_dir = proc_mkdir(PG_PROC_DIR, pn->net->proc_net);
3759         if (!pn->proc_dir) {
3760                 pr_warn("cannot create /proc/net/%s\n", PG_PROC_DIR);
3761                 return -ENODEV;
3762         }
3763         pe = proc_create(PGCTRL, 0600, pn->proc_dir, &pktgen_fops);
3764         if (pe == NULL) {
3765                 pr_err("cannot create %s procfs entry\n", PGCTRL);
3766                 ret = -EINVAL;
3767                 goto remove;
3768         }
3769 
3770         for_each_online_cpu(cpu) {
3771                 int err;
3772 
3773                 err = pktgen_create_thread(cpu, pn);
3774                 if (err)
3775                         pr_warn("Cannot create thread for cpu %d (%d)\n",
3776                                    cpu, err);
3777         }
3778 
3779         if (list_empty(&pn->pktgen_threads)) {
3780                 pr_err("Initialization failed for all threads\n");
3781                 ret = -ENODEV;
3782                 goto remove_entry;
3783         }
3784 
3785         return 0;
3786 
3787 remove_entry:
3788         remove_proc_entry(PGCTRL, pn->proc_dir);
3789 remove:
3790         remove_proc_entry(PG_PROC_DIR, pn->net->proc_net);
3791         return ret;
3792 }
3793 
3794 static void __net_exit pg_net_exit(struct net *net)
3795 {
3796         struct pktgen_net *pn = net_generic(net, pg_net_id);
3797         struct pktgen_thread *t;
3798         struct list_head *q, *n;
3799         LIST_HEAD(list);
3800 
3801         /* Stop all interfaces & threads */
3802         pn->pktgen_exiting = true;
3803 
3804         mutex_lock(&pktgen_thread_lock);
3805         list_splice_init(&pn->pktgen_threads, &list);
3806         mutex_unlock(&pktgen_thread_lock);
3807 
3808         list_for_each_safe(q, n, &list) {
3809                 t = list_entry(q, struct pktgen_thread, th_list);
3810                 list_del(&t->th_list);
3811                 kthread_stop(t->tsk);
3812                 kfree(t);
3813         }
3814 
3815         remove_proc_entry(PGCTRL, pn->proc_dir);
3816         remove_proc_entry(PG_PROC_DIR, pn->net->proc_net);
3817 }
3818 
3819 static struct pernet_operations pg_net_ops = {
3820         .init = pg_net_init,
3821         .exit = pg_net_exit,
3822         .id   = &pg_net_id,
3823         .size = sizeof(struct pktgen_net),
3824 };
3825 
3826 static int __init pg_init(void)
3827 {
3828         int ret = 0;
3829 
3830         pr_info("%s", version);
3831         ret = register_pernet_subsys(&pg_net_ops);
3832         if (ret)
3833                 return ret;
3834         ret = register_netdevice_notifier(&pktgen_notifier_block);
3835         if (ret)
3836                 unregister_pernet_subsys(&pg_net_ops);
3837 
3838         return ret;
3839 }
3840 
3841 static void __exit pg_cleanup(void)
3842 {
3843         unregister_netdevice_notifier(&pktgen_notifier_block);
3844         unregister_pernet_subsys(&pg_net_ops);
3845         /* Don't need rcu_barrier() due to use of kfree_rcu() */
3846 }
3847 
3848 module_init(pg_init);
3849 module_exit(pg_cleanup);
3850 
3851 MODULE_AUTHOR("Robert Olsson <robert.olsson@its.uu.se>");
3852 MODULE_DESCRIPTION("Packet Generator tool");
3853 MODULE_LICENSE("GPL");
3854 MODULE_VERSION(VERSION);
3855 module_param(pg_count_d, int, 0);
3856 MODULE_PARM_DESC(pg_count_d, "Default number of packets to inject");
3857 module_param(pg_delay_d, int, 0);
3858 MODULE_PARM_DESC(pg_delay_d, "Default delay between packets (nanoseconds)");
3859 module_param(pg_clone_skb_d, int, 0);
3860 MODULE_PARM_DESC(pg_clone_skb_d, "Default number of copies of the same packet");
3861 module_param(debug, int, 0);
3862 MODULE_PARM_DESC(debug, "Enable debugging of pktgen module");
3863 

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