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

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