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Linux/net/core/pktgen.c

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  1 /*
  2  * Authors:
  3  * Copyright 2001, 2002 by Robert Olsson <robert.olsson@its.uu.se>
  4  *                             Uppsala University and
  5  *                             Swedish University of Agricultural Sciences
  6  *
  7  * Alexey Kuznetsov  <kuznet@ms2.inr.ac.ru>
  8  * Ben Greear <greearb@candelatech.com>
  9  * Jens Låås <jens.laas@data.slu.se>
 10  *
 11  * This program is free software; you can redistribute it and/or
 12  * modify it under the terms of the GNU General Public License
 13  * as published by the Free Software Foundation; either version
 14  * 2 of the License, or (at your option) any later version.
 15  *
 16  *
 17  * A tool for loading the network with preconfigurated packets.
 18  * The tool is implemented as a linux module.  Parameters are output
 19  * device, delay (to hard_xmit), number of packets, and whether
 20  * to use multiple SKBs or just the same one.
 21  * pktgen uses the installed interface's output routine.
 22  *
 23  * Additional hacking by:
 24  *
 25  * Jens.Laas@data.slu.se
 26  * Improved by ANK. 010120.
 27  * Improved by ANK even more. 010212.
 28  * MAC address typo fixed. 010417 --ro
 29  * Integrated.  020301 --DaveM
 30  * Added multiskb option 020301 --DaveM
 31  * Scaling of results. 020417--sigurdur@linpro.no
 32  * Significant re-work of the module:
 33  *   *  Convert to threaded model to more efficiently be able to transmit
 34  *       and receive on multiple interfaces at once.
 35  *   *  Converted many counters to __u64 to allow longer runs.
 36  *   *  Allow configuration of ranges, like min/max IP address, MACs,
 37  *       and UDP-ports, for both source and destination, and can
 38  *       set to use a random distribution or sequentially walk the range.
 39  *   *  Can now change most values after starting.
 40  *   *  Place 12-byte packet in UDP payload with magic number,
 41  *       sequence number, and timestamp.
 42  *   *  Add receiver code that detects dropped pkts, re-ordered pkts, and
 43  *       latencies (with micro-second) precision.
 44  *   *  Add IOCTL interface to easily get counters & configuration.
 45  *   --Ben Greear <greearb@candelatech.com>
 46  *
 47  * Renamed multiskb to clone_skb and cleaned up sending core for two distinct
 48  * skb modes. A clone_skb=0 mode for Ben "ranges" work and a clone_skb != 0
 49  * as a "fastpath" with a configurable number of clones after alloc's.
 50  * clone_skb=0 means all packets are allocated this also means ranges time
 51  * stamps etc can be used. clone_skb=100 means 1 malloc is followed by 100
 52  * clones.
 53  *
 54  * Also moved to /proc/net/pktgen/
 55  * --ro
 56  *
 57  * Sept 10:  Fixed threading/locking.  Lots of bone-headed and more clever
 58  *    mistakes.  Also merged in DaveM's patch in the -pre6 patch.
 59  * --Ben Greear <greearb@candelatech.com>
 60  *
 61  * Integrated to 2.5.x 021029 --Lucio Maciel (luciomaciel@zipmail.com.br)
 62  *
 63  *
 64  * 021124 Finished major redesign and rewrite for new functionality.
 65  * See Documentation/networking/pktgen.txt for how to use this.
 66  *
 67  * The new operation:
 68  * For each CPU one thread/process is created at start. This process checks
 69  * for running devices in the if_list and sends packets until count is 0 it
 70  * also the thread checks the thread->control which is used for inter-process
 71  * communication. controlling process "posts" operations to the threads this
 72  * way.
 73  * The if_list is RCU protected, and the if_lock remains to protect updating
 74  * of if_list, from "add_device" as it invoked from userspace (via proc write).
 75  *
 76  * By design there should only be *one* "controlling" process. In practice
 77  * multiple write accesses gives unpredictable result. Understood by "write"
 78  * to /proc gives result code thats should be read be the "writer".
 79  * For practical use this should be no problem.
 80  *
 81  * Note when adding devices to a specific CPU there good idea to also assign
 82  * /proc/irq/XX/smp_affinity so TX-interrupts gets bound to the same CPU.
 83  * --ro
 84  *
 85  * Fix refcount off by one if first packet fails, potential null deref,
 86  * memleak 030710- KJP
 87  *
 88  * First "ranges" functionality for ipv6 030726 --ro
 89  *
 90  * Included flow support. 030802 ANK.
 91  *
 92  * Fixed unaligned access on IA-64 Grant Grundler <grundler@parisc-linux.org>
 93  *
 94  * Remove if fix from added Harald Welte <laforge@netfilter.org> 040419
 95  * ia64 compilation fix from  Aron Griffis <aron@hp.com> 040604
 96  *
 97  * New xmit() return, do_div and misc clean up by Stephen Hemminger
 98  * <shemminger@osdl.org> 040923
 99  *
100  * Randy Dunlap fixed u64 printk compiler warning
101  *
102  * Remove FCS from BW calculation.  Lennert Buytenhek <buytenh@wantstofly.org>
103  * New time handling. Lennert Buytenhek <buytenh@wantstofly.org> 041213
104  *
105  * Corrections from Nikolai Malykh (nmalykh@bilim.com)
106  * Removed unused flags F_SET_SRCMAC & F_SET_SRCIP 041230
107  *
108  * interruptible_sleep_on_timeout() replaced Nishanth Aravamudan <nacc@us.ibm.com>
109  * 050103
110  *
111  * MPLS support by Steven Whitehouse <steve@chygwyn.com>
112  *
113  * 802.1Q/Q-in-Q support by Francesco Fondelli (FF) <francesco.fondelli@gmail.com>
114  *
115  * Fixed src_mac command to set source mac of packet to value specified in
116  * command by Adit Ranadive <adit.262@gmail.com>
117  *
118  */
119 
120 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
121 
122 #include <linux/sys.h>
123 #include <linux/types.h>
124 #include <linux/module.h>
125 #include <linux/moduleparam.h>
126 #include <linux/kernel.h>
127 #include <linux/mutex.h>
128 #include <linux/sched.h>
129 #include <linux/slab.h>
130 #include <linux/vmalloc.h>
131 #include <linux/unistd.h>
132 #include <linux/string.h>
133 #include <linux/ptrace.h>
134 #include <linux/errno.h>
135 #include <linux/ioport.h>
136 #include <linux/interrupt.h>
137 #include <linux/capability.h>
138 #include <linux/hrtimer.h>
139 #include <linux/freezer.h>
140 #include <linux/delay.h>
141 #include <linux/timer.h>
142 #include <linux/list.h>
143 #include <linux/init.h>
144 #include <linux/skbuff.h>
145 #include <linux/netdevice.h>
146 #include <linux/inet.h>
147 #include <linux/inetdevice.h>
148 #include <linux/rtnetlink.h>
149 #include <linux/if_arp.h>
150 #include <linux/if_vlan.h>
151 #include <linux/in.h>
152 #include <linux/ip.h>
153 #include <linux/ipv6.h>
154 #include <linux/udp.h>
155 #include <linux/proc_fs.h>
156 #include <linux/seq_file.h>
157 #include <linux/wait.h>
158 #include <linux/etherdevice.h>
159 #include <linux/kthread.h>
160 #include <linux/prefetch.h>
161 #include <net/net_namespace.h>
162 #include <net/checksum.h>
163 #include <net/ipv6.h>
164 #include <net/udp.h>
165 #include <net/ip6_checksum.h>
166 #include <net/addrconf.h>
167 #ifdef CONFIG_XFRM
168 #include <net/xfrm.h>
169 #endif
170 #include <net/netns/generic.h>
171 #include <asm/byteorder.h>
172 #include <linux/rcupdate.h>
173 #include <linux/bitops.h>
174 #include <linux/io.h>
175 #include <linux/timex.h>
176 #include <linux/uaccess.h>
177 #include <asm/dma.h>
178 #include <asm/div64.h>          /* do_div */
179 
180 #define VERSION "2.75"
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 #define PKT_FLAGS                                                       \
188         pf(IPV6)                /* Interface in IPV6 Mode */            \
189         pf(IPSRC_RND)           /* IP-Src Random  */                    \
190         pf(IPDST_RND)           /* IP-Dst Random  */                    \
191         pf(TXSIZE_RND)          /* Transmit size is random */           \
192         pf(UDPSRC_RND)          /* UDP-Src Random */                    \
193         pf(UDPDST_RND)          /* UDP-Dst Random */                    \
194         pf(UDPCSUM)             /* Include UDP checksum */              \
195         pf(NO_TIMESTAMP)        /* Don't timestamp packets (default TS) */ \
196         pf(MPLS_RND)            /* Random MPLS labels */                \
197         pf(QUEUE_MAP_RND)       /* queue map Random */                  \
198         pf(QUEUE_MAP_CPU)       /* queue map mirrors smp_processor_id() */ \
199         pf(FLOW_SEQ)            /* Sequential flows */                  \
200         pf(IPSEC)               /* ipsec on for flows */                \
201         pf(MACSRC_RND)          /* MAC-Src Random */                    \
202         pf(MACDST_RND)          /* MAC-Dst Random */                    \
203         pf(VID_RND)             /* Random VLAN ID */                    \
204         pf(SVID_RND)            /* Random SVLAN ID */                   \
205         pf(NODE)                /* Node memory alloc*/                  \
206 
207 #define pf(flag)                flag##_SHIFT,
208 enum pkt_flags {
209         PKT_FLAGS
210 };
211 #undef pf
212 
213 /* Device flag bits */
214 #define pf(flag)                static const __u32 F_##flag = (1<<flag##_SHIFT);
215 PKT_FLAGS
216 #undef pf
217 
218 #define pf(flag)                __stringify(flag),
219 static char *pkt_flag_names[] = {
220         PKT_FLAGS
221 };
222 #undef pf
223 
224 #define NR_PKT_FLAGS            ARRAY_SIZE(pkt_flag_names)
225 
226 /* Thread control flag bits */
227 #define T_STOP        (1<<0)    /* Stop run */
228 #define T_RUN         (1<<1)    /* Start run */
229 #define T_REMDEVALL   (1<<2)    /* Remove all devs */
230 #define T_REMDEV      (1<<3)    /* Remove one dev */
231 
232 /* Xmit modes */
233 #define M_START_XMIT            0       /* Default normal TX */
234 #define M_NETIF_RECEIVE         1       /* Inject packets into stack */
235 #define M_QUEUE_XMIT            2       /* Inject packet into qdisc */
236 
237 /* If lock -- protects updating of if_list */
238 #define   if_lock(t)           mutex_lock(&(t->if_lock));
239 #define   if_unlock(t)           mutex_unlock(&(t->if_lock));
240 
241 /* Used to help with determining the pkts on receive */
242 #define PKTGEN_MAGIC 0xbe9be955
243 #define PG_PROC_DIR "pktgen"
244 #define PGCTRL      "pgctrl"
245 
246 #define MAX_CFLOWS  65536
247 
248 #define VLAN_TAG_SIZE(x) ((x)->vlan_id == 0xffff ? 0 : 4)
249 #define SVLAN_TAG_SIZE(x) ((x)->svlan_id == 0xffff ? 0 : 4)
250 
251 struct flow_state {
252         __be32 cur_daddr;
253         int count;
254 #ifdef CONFIG_XFRM
255         struct xfrm_state *x;
256 #endif
257         __u32 flags;
258 };
259 
260 /* flow flag bits */
261 #define F_INIT   (1<<0)         /* flow has been initialized */
262 
263 struct pktgen_dev {
264         /*
265          * Try to keep frequent/infrequent used vars. separated.
266          */
267         struct proc_dir_entry *entry;   /* proc file */
268         struct pktgen_thread *pg_thread;/* the owner */
269         struct list_head list;          /* chaining in the thread's run-queue */
270         struct rcu_head  rcu;           /* freed by RCU */
271 
272         int running;            /* if false, the test will stop */
273 
274         /* If min != max, then we will either do a linear iteration, or
275          * we will do a random selection from within the range.
276          */
277         __u32 flags;
278         int xmit_mode;
279         int min_pkt_size;
280         int max_pkt_size;
281         int pkt_overhead;       /* overhead for MPLS, VLANs, IPSEC etc */
282         int nfrags;
283         int removal_mark;       /* non-zero => the device is marked for
284                                  * removal by worker thread */
285 
286         struct page *page;
287         u64 delay;              /* nano-seconds */
288 
289         __u64 count;            /* Default No packets to send */
290         __u64 sofar;            /* How many pkts we've sent so far */
291         __u64 tx_bytes;         /* How many bytes we've transmitted */
292         __u64 errors;           /* Errors when trying to transmit, */
293 
294         /* runtime counters relating to clone_skb */
295 
296         __u32 clone_count;
297         int last_ok;            /* Was last skb sent?
298                                  * Or a failed transmit of some sort?
299                                  * This will keep sequence numbers in order
300                                  */
301         ktime_t next_tx;
302         ktime_t started_at;
303         ktime_t stopped_at;
304         u64     idle_acc;       /* nano-seconds */
305 
306         __u32 seq_num;
307 
308         int clone_skb;          /*
309                                  * Use multiple SKBs during packet gen.
310                                  * If this number is greater than 1, then
311                                  * that many copies of the same packet will be
312                                  * sent before a new packet is allocated.
313                                  * If you want to send 1024 identical packets
314                                  * before creating a new packet,
315                                  * set clone_skb to 1024.
316                                  */
317 
318         char dst_min[IP_NAME_SZ];       /* IP, ie 1.2.3.4 */
319         char dst_max[IP_NAME_SZ];       /* IP, ie 1.2.3.4 */
320         char src_min[IP_NAME_SZ];       /* IP, ie 1.2.3.4 */
321         char src_max[IP_NAME_SZ];       /* IP, ie 1.2.3.4 */
322 
323         struct in6_addr in6_saddr;
324         struct in6_addr in6_daddr;
325         struct in6_addr cur_in6_daddr;
326         struct in6_addr cur_in6_saddr;
327         /* For ranges */
328         struct in6_addr min_in6_daddr;
329         struct in6_addr max_in6_daddr;
330         struct in6_addr min_in6_saddr;
331         struct in6_addr max_in6_saddr;
332 
333         /* If we're doing ranges, random or incremental, then this
334          * defines the min/max for those ranges.
335          */
336         __be32 saddr_min;       /* inclusive, source IP address */
337         __be32 saddr_max;       /* exclusive, source IP address */
338         __be32 daddr_min;       /* inclusive, dest IP address */
339         __be32 daddr_max;       /* exclusive, dest IP address */
340 
341         __u16 udp_src_min;      /* inclusive, source UDP port */
342         __u16 udp_src_max;      /* exclusive, source UDP port */
343         __u16 udp_dst_min;      /* inclusive, dest UDP port */
344         __u16 udp_dst_max;      /* exclusive, dest UDP port */
345 
346         /* DSCP + ECN */
347         __u8 tos;            /* six MSB of (former) IPv4 TOS
348                                 are for dscp codepoint */
349         __u8 traffic_class;  /* ditto for the (former) Traffic Class in IPv6
350                                 (see RFC 3260, sec. 4) */
351 
352         /* MPLS */
353         unsigned int nr_labels; /* Depth of stack, 0 = no MPLS */
354         __be32 labels[MAX_MPLS_LABELS];
355 
356         /* VLAN/SVLAN (802.1Q/Q-in-Q) */
357         __u8  vlan_p;
358         __u8  vlan_cfi;
359         __u16 vlan_id;  /* 0xffff means no vlan tag */
360 
361         __u8  svlan_p;
362         __u8  svlan_cfi;
363         __u16 svlan_id; /* 0xffff means no svlan tag */
364 
365         __u32 src_mac_count;    /* How many MACs to iterate through */
366         __u32 dst_mac_count;    /* How many MACs to iterate through */
367 
368         unsigned char dst_mac[ETH_ALEN];
369         unsigned char src_mac[ETH_ALEN];
370 
371         __u32 cur_dst_mac_offset;
372         __u32 cur_src_mac_offset;
373         __be32 cur_saddr;
374         __be32 cur_daddr;
375         __u16 ip_id;
376         __u16 cur_udp_dst;
377         __u16 cur_udp_src;
378         __u16 cur_queue_map;
379         __u32 cur_pkt_size;
380         __u32 last_pkt_size;
381 
382         __u8 hh[14];
383         /* = {
384            0x00, 0x80, 0xC8, 0x79, 0xB3, 0xCB,
385 
386            We fill in SRC address later
387            0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
388            0x08, 0x00
389            };
390          */
391         __u16 pad;              /* pad out the hh struct to an even 16 bytes */
392 
393         struct sk_buff *skb;    /* skb we are to transmit next, used for when we
394                                  * are transmitting the same one multiple times
395                                  */
396         struct net_device *odev; /* The out-going device.
397                                   * Note that the device should have it's
398                                   * pg_info pointer pointing back to this
399                                   * device.
400                                   * Set when the user specifies the out-going
401                                   * device name (not when the inject is
402                                   * started as it used to do.)
403                                   */
404         char odevname[32];
405         struct flow_state *flows;
406         unsigned int cflows;    /* Concurrent flows (config) */
407         unsigned int lflow;             /* Flow length  (config) */
408         unsigned int nflows;    /* accumulated flows (stats) */
409         unsigned int curfl;             /* current sequenced flow (state)*/
410 
411         u16 queue_map_min;
412         u16 queue_map_max;
413         __u32 skb_priority;     /* skb priority field */
414         unsigned int burst;     /* number of duplicated packets to burst */
415         int node;               /* Memory node */
416 
417 #ifdef CONFIG_XFRM
418         __u8    ipsmode;                /* IPSEC mode (config) */
419         __u8    ipsproto;               /* IPSEC type (config) */
420         __u32   spi;
421         struct xfrm_dst xdst;
422         struct dst_ops dstops;
423 #endif
424         char result[512];
425 };
426 
427 struct pktgen_hdr {
428         __be32 pgh_magic;
429         __be32 seq_num;
430         __be32 tv_sec;
431         __be32 tv_usec;
432 };
433 
434 
435 static unsigned int pg_net_id __read_mostly;
436 
437 struct pktgen_net {
438         struct net              *net;
439         struct proc_dir_entry   *proc_dir;
440         struct list_head        pktgen_threads;
441         bool                    pktgen_exiting;
442 };
443 
444 struct pktgen_thread {
445         struct mutex if_lock;           /* for list of devices */
446         struct list_head if_list;       /* All device here */
447         struct list_head th_list;
448         struct task_struct *tsk;
449         char result[512];
450 
451         /* Field for thread to receive "posted" events terminate,
452            stop ifs etc. */
453 
454         u32 control;
455         int cpu;
456 
457         wait_queue_head_t queue;
458         struct completion start_done;
459         struct pktgen_net *net;
460 };
461 
462 #define REMOVE 1
463 #define FIND   0
464 
465 static const char version[] =
466         "Packet Generator for packet performance testing. "
467         "Version: " VERSION "\n";
468 
469 static int pktgen_remove_device(struct pktgen_thread *t, struct pktgen_dev *i);
470 static int pktgen_add_device(struct pktgen_thread *t, const char *ifname);
471 static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t,
472                                           const char *ifname, bool exact);
473 static int pktgen_device_event(struct notifier_block *, unsigned long, void *);
474 static void pktgen_run_all_threads(struct pktgen_net *pn);
475 static void pktgen_reset_all_threads(struct pktgen_net *pn);
476 static void pktgen_stop_all_threads_ifs(struct pktgen_net *pn);
477 
478 static void pktgen_stop(struct pktgen_thread *t);
479 static void pktgen_clear_counters(struct pktgen_dev *pkt_dev);
480 
481 /* Module parameters, defaults. */
482 static int pg_count_d __read_mostly = 1000;
483 static int pg_delay_d __read_mostly;
484 static int pg_clone_skb_d  __read_mostly;
485 static int debug  __read_mostly;
486 
487 static DEFINE_MUTEX(pktgen_thread_lock);
488 
489 static struct notifier_block pktgen_notifier_block = {
490         .notifier_call = pktgen_device_event,
491 };
492 
493 /*
494  * /proc handling functions
495  *
496  */
497 
498 static int pgctrl_show(struct seq_file *seq, void *v)
499 {
500         seq_puts(seq, version);
501         return 0;
502 }
503 
504 static ssize_t pgctrl_write(struct file *file, const char __user *buf,
505                             size_t count, loff_t *ppos)
506 {
507         char data[128];
508         struct pktgen_net *pn = net_generic(current->nsproxy->net_ns, pg_net_id);
509 
510         if (!capable(CAP_NET_ADMIN))
511                 return -EPERM;
512 
513         if (count == 0)
514                 return -EINVAL;
515 
516         if (count > sizeof(data))
517                 count = sizeof(data);
518 
519         if (copy_from_user(data, buf, count))
520                 return -EFAULT;
521 
522         data[count - 1] = 0;    /* Strip trailing '\n' and terminate string */
523 
524         if (!strcmp(data, "stop"))
525                 pktgen_stop_all_threads_ifs(pn);
526 
527         else if (!strcmp(data, "start"))
528                 pktgen_run_all_threads(pn);
529 
530         else if (!strcmp(data, "reset"))
531                 pktgen_reset_all_threads(pn);
532 
533         else
534                 return -EINVAL;
535 
536         return count;
537 }
538 
539 static int pgctrl_open(struct inode *inode, struct file *file)
540 {
541         return single_open(file, pgctrl_show, PDE_DATA(inode));
542 }
543 
544 static const struct file_operations pktgen_fops = {
545         .open    = pgctrl_open,
546         .read    = seq_read,
547         .llseek  = seq_lseek,
548         .write   = pgctrl_write,
549         .release = single_release,
550 };
551 
552 static int pktgen_if_show(struct seq_file *seq, void *v)
553 {
554         const struct pktgen_dev *pkt_dev = seq->private;
555         ktime_t stopped;
556         unsigned int i;
557         u64 idle;
558 
559         seq_printf(seq,
560                    "Params: count %llu  min_pkt_size: %u  max_pkt_size: %u\n",
561                    (unsigned long long)pkt_dev->count, pkt_dev->min_pkt_size,
562                    pkt_dev->max_pkt_size);
563 
564         seq_printf(seq,
565                    "     frags: %d  delay: %llu  clone_skb: %d  ifname: %s\n",
566                    pkt_dev->nfrags, (unsigned long long) pkt_dev->delay,
567                    pkt_dev->clone_skb, pkt_dev->odevname);
568 
569         seq_printf(seq, "     flows: %u flowlen: %u\n", pkt_dev->cflows,
570                    pkt_dev->lflow);
571 
572         seq_printf(seq,
573                    "     queue_map_min: %u  queue_map_max: %u\n",
574                    pkt_dev->queue_map_min,
575                    pkt_dev->queue_map_max);
576 
577         if (pkt_dev->skb_priority)
578                 seq_printf(seq, "     skb_priority: %u\n",
579                            pkt_dev->skb_priority);
580 
581         if (pkt_dev->flags & F_IPV6) {
582                 seq_printf(seq,
583                            "     saddr: %pI6c  min_saddr: %pI6c  max_saddr: %pI6c\n"
584                            "     daddr: %pI6c  min_daddr: %pI6c  max_daddr: %pI6c\n",
585                            &pkt_dev->in6_saddr,
586                            &pkt_dev->min_in6_saddr, &pkt_dev->max_in6_saddr,
587                            &pkt_dev->in6_daddr,
588                            &pkt_dev->min_in6_daddr, &pkt_dev->max_in6_daddr);
589         } else {
590                 seq_printf(seq,
591                            "     dst_min: %s  dst_max: %s\n",
592                            pkt_dev->dst_min, pkt_dev->dst_max);
593                 seq_printf(seq,
594                            "     src_min: %s  src_max: %s\n",
595                            pkt_dev->src_min, pkt_dev->src_max);
596         }
597 
598         seq_puts(seq, "     src_mac: ");
599 
600         seq_printf(seq, "%pM ",
601                    is_zero_ether_addr(pkt_dev->src_mac) ?
602                              pkt_dev->odev->dev_addr : pkt_dev->src_mac);
603 
604         seq_puts(seq, "dst_mac: ");
605         seq_printf(seq, "%pM\n", pkt_dev->dst_mac);
606 
607         seq_printf(seq,
608                    "     udp_src_min: %d  udp_src_max: %d"
609                    "  udp_dst_min: %d  udp_dst_max: %d\n",
610                    pkt_dev->udp_src_min, pkt_dev->udp_src_max,
611                    pkt_dev->udp_dst_min, pkt_dev->udp_dst_max);
612 
613         seq_printf(seq,
614                    "     src_mac_count: %d  dst_mac_count: %d\n",
615                    pkt_dev->src_mac_count, pkt_dev->dst_mac_count);
616 
617         if (pkt_dev->nr_labels) {
618                 seq_puts(seq, "     mpls: ");
619                 for (i = 0; i < pkt_dev->nr_labels; i++)
620                         seq_printf(seq, "%08x%s", ntohl(pkt_dev->labels[i]),
621                                    i == pkt_dev->nr_labels-1 ? "\n" : ", ");
622         }
623 
624         if (pkt_dev->vlan_id != 0xffff)
625                 seq_printf(seq, "     vlan_id: %u  vlan_p: %u  vlan_cfi: %u\n",
626                            pkt_dev->vlan_id, pkt_dev->vlan_p,
627                            pkt_dev->vlan_cfi);
628 
629         if (pkt_dev->svlan_id != 0xffff)
630                 seq_printf(seq, "     svlan_id: %u  vlan_p: %u  vlan_cfi: %u\n",
631                            pkt_dev->svlan_id, pkt_dev->svlan_p,
632                            pkt_dev->svlan_cfi);
633 
634         if (pkt_dev->tos)
635                 seq_printf(seq, "     tos: 0x%02x\n", pkt_dev->tos);
636 
637         if (pkt_dev->traffic_class)
638                 seq_printf(seq, "     traffic_class: 0x%02x\n", pkt_dev->traffic_class);
639 
640         if (pkt_dev->burst > 1)
641                 seq_printf(seq, "     burst: %d\n", pkt_dev->burst);
642 
643         if (pkt_dev->node >= 0)
644                 seq_printf(seq, "     node: %d\n", pkt_dev->node);
645 
646         if (pkt_dev->xmit_mode == M_NETIF_RECEIVE)
647                 seq_puts(seq, "     xmit_mode: netif_receive\n");
648         else if (pkt_dev->xmit_mode == M_QUEUE_XMIT)
649                 seq_puts(seq, "     xmit_mode: xmit_queue\n");
650 
651         seq_puts(seq, "     Flags: ");
652 
653         for (i = 0; i < NR_PKT_FLAGS; i++) {
654                 if (i == F_FLOW_SEQ)
655                         if (!pkt_dev->cflows)
656                                 continue;
657 
658                 if (pkt_dev->flags & (1 << i))
659                         seq_printf(seq, "%s  ", pkt_flag_names[i]);
660                 else if (i == F_FLOW_SEQ)
661                         seq_puts(seq, "FLOW_RND  ");
662 
663 #ifdef CONFIG_XFRM
664                 if (i == F_IPSEC && pkt_dev->spi)
665                         seq_printf(seq, "spi:%u", pkt_dev->spi);
666 #endif
667         }
668 
669         seq_puts(seq, "\n");
670 
671         /* not really stopped, more like last-running-at */
672         stopped = pkt_dev->running ? ktime_get() : pkt_dev->stopped_at;
673         idle = pkt_dev->idle_acc;
674         do_div(idle, NSEC_PER_USEC);
675 
676         seq_printf(seq,
677                    "Current:\n     pkts-sofar: %llu  errors: %llu\n",
678                    (unsigned long long)pkt_dev->sofar,
679                    (unsigned long long)pkt_dev->errors);
680 
681         seq_printf(seq,
682                    "     started: %lluus  stopped: %lluus idle: %lluus\n",
683                    (unsigned long long) ktime_to_us(pkt_dev->started_at),
684                    (unsigned long long) ktime_to_us(stopped),
685                    (unsigned long long) idle);
686 
687         seq_printf(seq,
688                    "     seq_num: %d  cur_dst_mac_offset: %d  cur_src_mac_offset: %d\n",
689                    pkt_dev->seq_num, pkt_dev->cur_dst_mac_offset,
690                    pkt_dev->cur_src_mac_offset);
691 
692         if (pkt_dev->flags & F_IPV6) {
693                 seq_printf(seq, "     cur_saddr: %pI6c  cur_daddr: %pI6c\n",
694                                 &pkt_dev->cur_in6_saddr,
695                                 &pkt_dev->cur_in6_daddr);
696         } else
697                 seq_printf(seq, "     cur_saddr: %pI4  cur_daddr: %pI4\n",
698                            &pkt_dev->cur_saddr, &pkt_dev->cur_daddr);
699 
700         seq_printf(seq, "     cur_udp_dst: %d  cur_udp_src: %d\n",
701                    pkt_dev->cur_udp_dst, pkt_dev->cur_udp_src);
702 
703         seq_printf(seq, "     cur_queue_map: %u\n", pkt_dev->cur_queue_map);
704 
705         seq_printf(seq, "     flows: %u\n", pkt_dev->nflows);
706 
707         if (pkt_dev->result[0])
708                 seq_printf(seq, "Result: %s\n", pkt_dev->result);
709         else
710                 seq_puts(seq, "Result: Idle\n");
711 
712         return 0;
713 }
714 
715 
716 static int hex32_arg(const char __user *user_buffer, unsigned long maxlen,
717                      __u32 *num)
718 {
719         int i = 0;
720         *num = 0;
721 
722         for (; i < maxlen; i++) {
723                 int value;
724                 char c;
725                 *num <<= 4;
726                 if (get_user(c, &user_buffer[i]))
727                         return -EFAULT;
728                 value = hex_to_bin(c);
729                 if (value >= 0)
730                         *num |= value;
731                 else
732                         break;
733         }
734         return i;
735 }
736 
737 static int count_trail_chars(const char __user * user_buffer,
738                              unsigned int maxlen)
739 {
740         int i;
741 
742         for (i = 0; i < maxlen; i++) {
743                 char c;
744                 if (get_user(c, &user_buffer[i]))
745                         return -EFAULT;
746                 switch (c) {
747                 case '\"':
748                 case '\n':
749                 case '\r':
750                 case '\t':
751                 case ' ':
752                 case '=':
753                         break;
754                 default:
755                         goto done;
756                 }
757         }
758 done:
759         return i;
760 }
761 
762 static long num_arg(const char __user *user_buffer, unsigned long maxlen,
763                                 unsigned long *num)
764 {
765         int i;
766         *num = 0;
767 
768         for (i = 0; i < maxlen; i++) {
769                 char c;
770                 if (get_user(c, &user_buffer[i]))
771                         return -EFAULT;
772                 if ((c >= '') && (c <= '9')) {
773                         *num *= 10;
774                         *num += c - '';
775                 } else
776                         break;
777         }
778         return i;
779 }
780 
781 static int strn_len(const char __user * user_buffer, unsigned int maxlen)
782 {
783         int i;
784 
785         for (i = 0; i < maxlen; i++) {
786                 char c;
787                 if (get_user(c, &user_buffer[i]))
788                         return -EFAULT;
789                 switch (c) {
790                 case '\"':
791                 case '\n':
792                 case '\r':
793                 case '\t':
794                 case ' ':
795                         goto done_str;
796                 default:
797                         break;
798                 }
799         }
800 done_str:
801         return i;
802 }
803 
804 static ssize_t get_labels(const char __user *buffer, struct pktgen_dev *pkt_dev)
805 {
806         unsigned int n = 0;
807         char c;
808         ssize_t i = 0;
809         int len;
810 
811         pkt_dev->nr_labels = 0;
812         do {
813                 __u32 tmp;
814                 len = hex32_arg(&buffer[i], 8, &tmp);
815                 if (len <= 0)
816                         return len;
817                 pkt_dev->labels[n] = htonl(tmp);
818                 if (pkt_dev->labels[n] & MPLS_STACK_BOTTOM)
819                         pkt_dev->flags |= F_MPLS_RND;
820                 i += len;
821                 if (get_user(c, &buffer[i]))
822                         return -EFAULT;
823                 i++;
824                 n++;
825                 if (n >= MAX_MPLS_LABELS)
826                         return -E2BIG;
827         } while (c == ',');
828 
829         pkt_dev->nr_labels = n;
830         return i;
831 }
832 
833 static __u32 pktgen_read_flag(const char *f, bool *disable)
834 {
835         __u32 i;
836 
837         if (f[0] == '!') {
838                 *disable = true;
839                 f++;
840         }
841 
842         for (i = 0; i < NR_PKT_FLAGS; i++) {
843                 if (!IS_ENABLED(CONFIG_XFRM) && i == IPSEC_SHIFT)
844                         continue;
845 
846                 /* allow only disabling ipv6 flag */
847                 if (!*disable && i == IPV6_SHIFT)
848                         continue;
849 
850                 if (strcmp(f, pkt_flag_names[i]) == 0)
851                         return 1 << i;
852         }
853 
854         if (strcmp(f, "FLOW_RND") == 0) {
855                 *disable = !*disable;
856                 return F_FLOW_SEQ;
857         }
858 
859         return 0;
860 }
861 
862 static ssize_t pktgen_if_write(struct file *file,
863                                const char __user * user_buffer, size_t count,
864                                loff_t * offset)
865 {
866         struct seq_file *seq = file->private_data;
867         struct pktgen_dev *pkt_dev = seq->private;
868         int i, max, len;
869         char name[16], valstr[32];
870         unsigned long value = 0;
871         char *pg_result = NULL;
872         int tmp = 0;
873         char buf[128];
874 
875         pg_result = &(pkt_dev->result[0]);
876 
877         if (count < 1) {
878                 pr_warn("wrong command format\n");
879                 return -EINVAL;
880         }
881 
882         max = count;
883         tmp = count_trail_chars(user_buffer, max);
884         if (tmp < 0) {
885                 pr_warn("illegal format\n");
886                 return tmp;
887         }
888         i = tmp;
889 
890         /* Read variable name */
891 
892         len = strn_len(&user_buffer[i], sizeof(name) - 1);
893         if (len < 0)
894                 return len;
895 
896         memset(name, 0, sizeof(name));
897         if (copy_from_user(name, &user_buffer[i], len))
898                 return -EFAULT;
899         i += len;
900 
901         max = count - i;
902         len = count_trail_chars(&user_buffer[i], max);
903         if (len < 0)
904                 return len;
905 
906         i += len;
907 
908         if (debug) {
909                 size_t copy = min_t(size_t, count + 1, 1024);
910                 char *tp = strndup_user(user_buffer, copy);
911 
912                 if (IS_ERR(tp))
913                         return PTR_ERR(tp);
914 
915                 pr_debug("%s,%zu  buffer -:%s:-\n", name, count, tp);
916                 kfree(tp);
917         }
918 
919         if (!strcmp(name, "min_pkt_size")) {
920                 len = num_arg(&user_buffer[i], 10, &value);
921                 if (len < 0)
922                         return len;
923 
924                 i += len;
925                 if (value < 14 + 20 + 8)
926                         value = 14 + 20 + 8;
927                 if (value != pkt_dev->min_pkt_size) {
928                         pkt_dev->min_pkt_size = value;
929                         pkt_dev->cur_pkt_size = value;
930                 }
931                 sprintf(pg_result, "OK: min_pkt_size=%u",
932                         pkt_dev->min_pkt_size);
933                 return count;
934         }
935 
936         if (!strcmp(name, "max_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->max_pkt_size) {
945                         pkt_dev->max_pkt_size = value;
946                         pkt_dev->cur_pkt_size = value;
947                 }
948                 sprintf(pg_result, "OK: max_pkt_size=%u",
949                         pkt_dev->max_pkt_size);
950                 return count;
951         }
952 
953         /* Shortcut for min = max */
954 
955         if (!strcmp(name, "pkt_size")) {
956                 len = num_arg(&user_buffer[i], 10, &value);
957                 if (len < 0)
958                         return len;
959 
960                 i += len;
961                 if (value < 14 + 20 + 8)
962                         value = 14 + 20 + 8;
963                 if (value != pkt_dev->min_pkt_size) {
964                         pkt_dev->min_pkt_size = value;
965                         pkt_dev->max_pkt_size = value;
966                         pkt_dev->cur_pkt_size = value;
967                 }
968                 sprintf(pg_result, "OK: pkt_size=%u", pkt_dev->min_pkt_size);
969                 return count;
970         }
971 
972         if (!strcmp(name, "debug")) {
973                 len = num_arg(&user_buffer[i], 10, &value);
974                 if (len < 0)
975                         return len;
976 
977                 i += len;
978                 debug = value;
979                 sprintf(pg_result, "OK: debug=%u", debug);
980                 return count;
981         }
982 
983         if (!strcmp(name, "frags")) {
984                 len = num_arg(&user_buffer[i], 10, &value);
985                 if (len < 0)
986                         return len;
987 
988                 i += len;
989                 pkt_dev->nfrags = value;
990                 sprintf(pg_result, "OK: frags=%u", pkt_dev->nfrags);
991                 return count;
992         }
993         if (!strcmp(name, "delay")) {
994                 len = num_arg(&user_buffer[i], 10, &value);
995                 if (len < 0)
996                         return len;
997 
998                 i += len;
999                 if (value == 0x7FFFFFFF)
1000                         pkt_dev->delay = ULLONG_MAX;
1001                 else
1002                         pkt_dev->delay = (u64)value;
1003 
1004                 sprintf(pg_result, "OK: delay=%llu",
1005                         (unsigned long long) pkt_dev->delay);
1006                 return count;
1007         }
1008         if (!strcmp(name, "rate")) {
1009                 len = num_arg(&user_buffer[i], 10, &value);
1010                 if (len < 0)
1011                         return len;
1012 
1013                 i += len;
1014                 if (!value)
1015                         return len;
1016                 pkt_dev->delay = pkt_dev->min_pkt_size*8*NSEC_PER_USEC/value;
1017                 if (debug)
1018                         pr_info("Delay set at: %llu ns\n", pkt_dev->delay);
1019 
1020                 sprintf(pg_result, "OK: rate=%lu", value);
1021                 return count;
1022         }
1023         if (!strcmp(name, "ratep")) {
1024                 len = num_arg(&user_buffer[i], 10, &value);
1025                 if (len < 0)
1026                         return len;
1027 
1028                 i += len;
1029                 if (!value)
1030                         return len;
1031                 pkt_dev->delay = NSEC_PER_SEC/value;
1032                 if (debug)
1033                         pr_info("Delay set at: %llu ns\n", pkt_dev->delay);
1034 
1035                 sprintf(pg_result, "OK: rate=%lu", value);
1036                 return count;
1037         }
1038         if (!strcmp(name, "udp_src_min")) {
1039                 len = num_arg(&user_buffer[i], 10, &value);
1040                 if (len < 0)
1041                         return len;
1042 
1043                 i += len;
1044                 if (value != pkt_dev->udp_src_min) {
1045                         pkt_dev->udp_src_min = value;
1046                         pkt_dev->cur_udp_src = value;
1047                 }
1048                 sprintf(pg_result, "OK: udp_src_min=%u", pkt_dev->udp_src_min);
1049                 return count;
1050         }
1051         if (!strcmp(name, "udp_dst_min")) {
1052                 len = num_arg(&user_buffer[i], 10, &value);
1053                 if (len < 0)
1054                         return len;
1055 
1056                 i += len;
1057                 if (value != pkt_dev->udp_dst_min) {
1058                         pkt_dev->udp_dst_min = value;
1059                         pkt_dev->cur_udp_dst = value;
1060                 }
1061                 sprintf(pg_result, "OK: udp_dst_min=%u", pkt_dev->udp_dst_min);
1062                 return count;
1063         }
1064         if (!strcmp(name, "udp_src_max")) {
1065                 len = num_arg(&user_buffer[i], 10, &value);
1066                 if (len < 0)
1067                         return len;
1068 
1069                 i += len;
1070                 if (value != pkt_dev->udp_src_max) {
1071                         pkt_dev->udp_src_max = value;
1072                         pkt_dev->cur_udp_src = value;
1073                 }
1074                 sprintf(pg_result, "OK: udp_src_max=%u", pkt_dev->udp_src_max);
1075                 return count;
1076         }
1077         if (!strcmp(name, "udp_dst_max")) {
1078                 len = num_arg(&user_buffer[i], 10, &value);
1079                 if (len < 0)
1080                         return len;
1081 
1082                 i += len;
1083                 if (value != pkt_dev->udp_dst_max) {
1084                         pkt_dev->udp_dst_max = value;
1085                         pkt_dev->cur_udp_dst = value;
1086                 }
1087                 sprintf(pg_result, "OK: udp_dst_max=%u", pkt_dev->udp_dst_max);
1088                 return count;
1089         }
1090         if (!strcmp(name, "clone_skb")) {
1091                 len = num_arg(&user_buffer[i], 10, &value);
1092                 if (len < 0)
1093                         return len;
1094                 if ((value > 0) &&
1095                     ((pkt_dev->xmit_mode == M_NETIF_RECEIVE) ||
1096                      !(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)))
1097                         return -ENOTSUPP;
1098                 i += len;
1099                 pkt_dev->clone_skb = value;
1100 
1101                 sprintf(pg_result, "OK: clone_skb=%d", pkt_dev->clone_skb);
1102                 return count;
1103         }
1104         if (!strcmp(name, "count")) {
1105                 len = num_arg(&user_buffer[i], 10, &value);
1106                 if (len < 0)
1107                         return len;
1108 
1109                 i += len;
1110                 pkt_dev->count = value;
1111                 sprintf(pg_result, "OK: count=%llu",
1112                         (unsigned long long)pkt_dev->count);
1113                 return count;
1114         }
1115         if (!strcmp(name, "src_mac_count")) {
1116                 len = num_arg(&user_buffer[i], 10, &value);
1117                 if (len < 0)
1118                         return len;
1119 
1120                 i += len;
1121                 if (pkt_dev->src_mac_count != value) {
1122                         pkt_dev->src_mac_count = value;
1123                         pkt_dev->cur_src_mac_offset = 0;
1124                 }
1125                 sprintf(pg_result, "OK: src_mac_count=%d",
1126                         pkt_dev->src_mac_count);
1127                 return count;
1128         }
1129         if (!strcmp(name, "dst_mac_count")) {
1130                 len = num_arg(&user_buffer[i], 10, &value);
1131                 if (len < 0)
1132                         return len;
1133 
1134                 i += len;
1135                 if (pkt_dev->dst_mac_count != value) {
1136                         pkt_dev->dst_mac_count = value;
1137                         pkt_dev->cur_dst_mac_offset = 0;
1138                 }
1139                 sprintf(pg_result, "OK: dst_mac_count=%d",
1140                         pkt_dev->dst_mac_count);
1141                 return count;
1142         }
1143         if (!strcmp(name, "burst")) {
1144                 len = num_arg(&user_buffer[i], 10, &value);
1145                 if (len < 0)
1146                         return len;
1147 
1148                 i += len;
1149                 if ((value > 1) &&
1150                     ((pkt_dev->xmit_mode == M_QUEUE_XMIT) ||
1151                      ((pkt_dev->xmit_mode == M_START_XMIT) &&
1152                      (!(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)))))
1153                         return -ENOTSUPP;
1154                 pkt_dev->burst = value < 1 ? 1 : value;
1155                 sprintf(pg_result, "OK: burst=%d", pkt_dev->burst);
1156                 return count;
1157         }
1158         if (!strcmp(name, "node")) {
1159                 len = num_arg(&user_buffer[i], 10, &value);
1160                 if (len < 0)
1161                         return len;
1162 
1163                 i += len;
1164 
1165                 if (node_possible(value)) {
1166                         pkt_dev->node = value;
1167                         sprintf(pg_result, "OK: node=%d", pkt_dev->node);
1168                         if (pkt_dev->page) {
1169                                 put_page(pkt_dev->page);
1170                                 pkt_dev->page = NULL;
1171                         }
1172                 }
1173                 else
1174                         sprintf(pg_result, "ERROR: node not possible");
1175                 return count;
1176         }
1177         if (!strcmp(name, "xmit_mode")) {
1178                 char f[32];
1179 
1180                 memset(f, 0, 32);
1181                 len = strn_len(&user_buffer[i], sizeof(f) - 1);
1182                 if (len < 0)
1183                         return len;
1184 
1185                 if (copy_from_user(f, &user_buffer[i], len))
1186                         return -EFAULT;
1187                 i += len;
1188 
1189                 if (strcmp(f, "start_xmit") == 0) {
1190                         pkt_dev->xmit_mode = M_START_XMIT;
1191                 } else if (strcmp(f, "netif_receive") == 0) {
1192                         /* clone_skb set earlier, not supported in this mode */
1193                         if (pkt_dev->clone_skb > 0)
1194                                 return -ENOTSUPP;
1195 
1196                         pkt_dev->xmit_mode = M_NETIF_RECEIVE;
1197 
1198                         /* make sure new packet is allocated every time
1199                          * pktgen_xmit() is called
1200                          */
1201                         pkt_dev->last_ok = 1;
1202 
1203                         /* override clone_skb if user passed default value
1204                          * at module loading time
1205                          */
1206                         pkt_dev->clone_skb = 0;
1207                 } else if (strcmp(f, "queue_xmit") == 0) {
1208                         pkt_dev->xmit_mode = M_QUEUE_XMIT;
1209                         pkt_dev->last_ok = 1;
1210                 } else {
1211                         sprintf(pg_result,
1212                                 "xmit_mode -:%s:- unknown\nAvailable modes: %s",
1213                                 f, "start_xmit, netif_receive\n");
1214                         return count;
1215                 }
1216                 sprintf(pg_result, "OK: xmit_mode=%s", f);
1217                 return count;
1218         }
1219         if (!strcmp(name, "flag")) {
1220                 __u32 flag;
1221                 char f[32];
1222                 bool disable = false;
1223 
1224                 memset(f, 0, 32);
1225                 len = strn_len(&user_buffer[i], sizeof(f) - 1);
1226                 if (len < 0)
1227                         return len;
1228 
1229                 if (copy_from_user(f, &user_buffer[i], len))
1230                         return -EFAULT;
1231                 i += len;
1232 
1233                 flag = pktgen_read_flag(f, &disable);
1234 
1235                 if (flag) {
1236                         if (disable)
1237                                 pkt_dev->flags &= ~flag;
1238                         else
1239                                 pkt_dev->flags |= flag;
1240                 } else {
1241                         sprintf(pg_result,
1242                                 "Flag -:%s:- unknown\nAvailable flags, (prepend ! to un-set flag):\n%s",
1243                                 f,
1244                                 "IPSRC_RND, IPDST_RND, UDPSRC_RND, UDPDST_RND, "
1245                                 "MACSRC_RND, MACDST_RND, TXSIZE_RND, IPV6, "
1246                                 "MPLS_RND, VID_RND, SVID_RND, FLOW_SEQ, "
1247                                 "QUEUE_MAP_RND, QUEUE_MAP_CPU, UDPCSUM, "
1248                                 "NO_TIMESTAMP, "
1249 #ifdef CONFIG_XFRM
1250                                 "IPSEC, "
1251 #endif
1252                                 "NODE_ALLOC\n");
1253                         return count;
1254                 }
1255                 sprintf(pg_result, "OK: flags=0x%x", pkt_dev->flags);
1256                 return count;
1257         }
1258         if (!strcmp(name, "dst_min") || !strcmp(name, "dst")) {
1259                 len = strn_len(&user_buffer[i], sizeof(pkt_dev->dst_min) - 1);
1260                 if (len < 0)
1261                         return len;
1262 
1263                 if (copy_from_user(buf, &user_buffer[i], len))
1264                         return -EFAULT;
1265                 buf[len] = 0;
1266                 if (strcmp(buf, pkt_dev->dst_min) != 0) {
1267                         memset(pkt_dev->dst_min, 0, sizeof(pkt_dev->dst_min));
1268                         strncpy(pkt_dev->dst_min, buf, len);
1269                         pkt_dev->daddr_min = in_aton(pkt_dev->dst_min);
1270                         pkt_dev->cur_daddr = pkt_dev->daddr_min;
1271                 }
1272                 if (debug)
1273                         pr_debug("dst_min set to: %s\n", pkt_dev->dst_min);
1274                 i += len;
1275                 sprintf(pg_result, "OK: dst_min=%s", pkt_dev->dst_min);
1276                 return count;
1277         }
1278         if (!strcmp(name, "dst_max")) {
1279                 len = strn_len(&user_buffer[i], sizeof(pkt_dev->dst_max) - 1);
1280                 if (len < 0)
1281                         return len;
1282 
1283 
1284                 if (copy_from_user(buf, &user_buffer[i], len))
1285                         return -EFAULT;
1286 
1287                 buf[len] = 0;
1288                 if (strcmp(buf, pkt_dev->dst_max) != 0) {
1289                         memset(pkt_dev->dst_max, 0, sizeof(pkt_dev->dst_max));
1290                         strncpy(pkt_dev->dst_max, buf, len);
1291                         pkt_dev->daddr_max = in_aton(pkt_dev->dst_max);
1292                         pkt_dev->cur_daddr = pkt_dev->daddr_max;
1293                 }
1294                 if (debug)
1295                         pr_debug("dst_max set to: %s\n", pkt_dev->dst_max);
1296                 i += len;
1297                 sprintf(pg_result, "OK: dst_max=%s", pkt_dev->dst_max);
1298                 return count;
1299         }
1300         if (!strcmp(name, "dst6")) {
1301                 len = strn_len(&user_buffer[i], sizeof(buf) - 1);
1302                 if (len < 0)
1303                         return len;
1304 
1305                 pkt_dev->flags |= F_IPV6;
1306 
1307                 if (copy_from_user(buf, &user_buffer[i], len))
1308                         return -EFAULT;
1309                 buf[len] = 0;
1310 
1311                 in6_pton(buf, -1, pkt_dev->in6_daddr.s6_addr, -1, NULL);
1312                 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->in6_daddr);
1313 
1314                 pkt_dev->cur_in6_daddr = pkt_dev->in6_daddr;
1315 
1316                 if (debug)
1317                         pr_debug("dst6 set to: %s\n", buf);
1318 
1319                 i += len;
1320                 sprintf(pg_result, "OK: dst6=%s", buf);
1321                 return count;
1322         }
1323         if (!strcmp(name, "dst6_min")) {
1324                 len = strn_len(&user_buffer[i], sizeof(buf) - 1);
1325                 if (len < 0)
1326                         return len;
1327 
1328                 pkt_dev->flags |= F_IPV6;
1329 
1330                 if (copy_from_user(buf, &user_buffer[i], len))
1331                         return -EFAULT;
1332                 buf[len] = 0;
1333 
1334                 in6_pton(buf, -1, pkt_dev->min_in6_daddr.s6_addr, -1, NULL);
1335                 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->min_in6_daddr);
1336 
1337                 pkt_dev->cur_in6_daddr = pkt_dev->min_in6_daddr;
1338                 if (debug)
1339                         pr_debug("dst6_min set to: %s\n", buf);
1340 
1341                 i += len;
1342                 sprintf(pg_result, "OK: dst6_min=%s", buf);
1343                 return count;
1344         }
1345         if (!strcmp(name, "dst6_max")) {
1346                 len = strn_len(&user_buffer[i], sizeof(buf) - 1);
1347                 if (len < 0)
1348                         return len;
1349 
1350                 pkt_dev->flags |= F_IPV6;
1351 
1352                 if (copy_from_user(buf, &user_buffer[i], len))
1353                         return -EFAULT;
1354                 buf[len] = 0;
1355 
1356                 in6_pton(buf, -1, pkt_dev->max_in6_daddr.s6_addr, -1, NULL);
1357                 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->max_in6_daddr);
1358 
1359                 if (debug)
1360                         pr_debug("dst6_max set to: %s\n", buf);
1361 
1362                 i += len;
1363                 sprintf(pg_result, "OK: dst6_max=%s", buf);
1364                 return count;
1365         }
1366         if (!strcmp(name, "src6")) {
1367                 len = strn_len(&user_buffer[i], sizeof(buf) - 1);
1368                 if (len < 0)
1369                         return len;
1370 
1371                 pkt_dev->flags |= F_IPV6;
1372 
1373                 if (copy_from_user(buf, &user_buffer[i], len))
1374                         return -EFAULT;
1375                 buf[len] = 0;
1376 
1377                 in6_pton(buf, -1, pkt_dev->in6_saddr.s6_addr, -1, NULL);
1378                 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->in6_saddr);
1379 
1380                 pkt_dev->cur_in6_saddr = pkt_dev->in6_saddr;
1381 
1382                 if (debug)
1383                         pr_debug("src6 set to: %s\n", buf);
1384 
1385                 i += len;
1386                 sprintf(pg_result, "OK: src6=%s", buf);
1387                 return count;
1388         }
1389         if (!strcmp(name, "src_min")) {
1390                 len = strn_len(&user_buffer[i], sizeof(pkt_dev->src_min) - 1);
1391                 if (len < 0)
1392                         return len;
1393 
1394                 if (copy_from_user(buf, &user_buffer[i], len))
1395                         return -EFAULT;
1396                 buf[len] = 0;
1397                 if (strcmp(buf, pkt_dev->src_min) != 0) {
1398                         memset(pkt_dev->src_min, 0, sizeof(pkt_dev->src_min));
1399                         strncpy(pkt_dev->src_min, buf, len);
1400                         pkt_dev->saddr_min = in_aton(pkt_dev->src_min);
1401                         pkt_dev->cur_saddr = pkt_dev->saddr_min;
1402                 }
1403                 if (debug)
1404                         pr_debug("src_min set to: %s\n", pkt_dev->src_min);
1405                 i += len;
1406                 sprintf(pg_result, "OK: src_min=%s", pkt_dev->src_min);
1407                 return count;
1408         }
1409         if (!strcmp(name, "src_max")) {
1410                 len = strn_len(&user_buffer[i], sizeof(pkt_dev->src_max) - 1);
1411                 if (len < 0)
1412                         return len;
1413 
1414                 if (copy_from_user(buf, &user_buffer[i], len))
1415                         return -EFAULT;
1416                 buf[len] = 0;
1417                 if (strcmp(buf, pkt_dev->src_max) != 0) {
1418                         memset(pkt_dev->src_max, 0, sizeof(pkt_dev->src_max));
1419                         strncpy(pkt_dev->src_max, buf, len);
1420                         pkt_dev->saddr_max = in_aton(pkt_dev->src_max);
1421                         pkt_dev->cur_saddr = pkt_dev->saddr_max;
1422                 }
1423                 if (debug)
1424                         pr_debug("src_max set to: %s\n", pkt_dev->src_max);
1425                 i += len;
1426                 sprintf(pg_result, "OK: src_max=%s", pkt_dev->src_max);
1427                 return count;
1428         }
1429         if (!strcmp(name, "dst_mac")) {
1430                 len = strn_len(&user_buffer[i], sizeof(valstr) - 1);
1431                 if (len < 0)
1432                         return len;
1433 
1434                 memset(valstr, 0, sizeof(valstr));
1435                 if (copy_from_user(valstr, &user_buffer[i], len))
1436                         return -EFAULT;
1437 
1438                 if (!mac_pton(valstr, pkt_dev->dst_mac))
1439                         return -EINVAL;
1440                 /* Set up Dest MAC */
1441                 ether_addr_copy(&pkt_dev->hh[0], pkt_dev->dst_mac);
1442 
1443                 sprintf(pg_result, "OK: dstmac %pM", pkt_dev->dst_mac);
1444                 return count;
1445         }
1446         if (!strcmp(name, "src_mac")) {
1447                 len = strn_len(&user_buffer[i], sizeof(valstr) - 1);
1448                 if (len < 0)
1449                         return len;
1450 
1451                 memset(valstr, 0, sizeof(valstr));
1452                 if (copy_from_user(valstr, &user_buffer[i], len))
1453                         return -EFAULT;
1454 
1455                 if (!mac_pton(valstr, pkt_dev->src_mac))
1456                         return -EINVAL;
1457                 /* Set up Src MAC */
1458                 ether_addr_copy(&pkt_dev->hh[6], pkt_dev->src_mac);
1459 
1460                 sprintf(pg_result, "OK: srcmac %pM", pkt_dev->src_mac);
1461                 return count;
1462         }
1463 
1464         if (!strcmp(name, "clear_counters")) {
1465                 pktgen_clear_counters(pkt_dev);
1466                 sprintf(pg_result, "OK: Clearing counters.\n");
1467                 return count;
1468         }
1469 
1470         if (!strcmp(name, "flows")) {
1471                 len = num_arg(&user_buffer[i], 10, &value);
1472                 if (len < 0)
1473                         return len;
1474 
1475                 i += len;
1476                 if (value > MAX_CFLOWS)
1477                         value = MAX_CFLOWS;
1478 
1479                 pkt_dev->cflows = value;
1480                 sprintf(pg_result, "OK: flows=%u", pkt_dev->cflows);
1481                 return count;
1482         }
1483 #ifdef CONFIG_XFRM
1484         if (!strcmp(name, "spi")) {
1485                 len = num_arg(&user_buffer[i], 10, &value);
1486                 if (len < 0)
1487                         return len;
1488 
1489                 i += len;
1490                 pkt_dev->spi = value;
1491                 sprintf(pg_result, "OK: spi=%u", pkt_dev->spi);
1492                 return count;
1493         }
1494 #endif
1495         if (!strcmp(name, "flowlen")) {
1496                 len = num_arg(&user_buffer[i], 10, &value);
1497                 if (len < 0)
1498                         return len;
1499 
1500                 i += len;
1501                 pkt_dev->lflow = value;
1502                 sprintf(pg_result, "OK: flowlen=%u", pkt_dev->lflow);
1503                 return count;
1504         }
1505 
1506         if (!strcmp(name, "queue_map_min")) {
1507                 len = num_arg(&user_buffer[i], 5, &value);
1508                 if (len < 0)
1509                         return len;
1510 
1511                 i += len;
1512                 pkt_dev->queue_map_min = value;
1513                 sprintf(pg_result, "OK: queue_map_min=%u", pkt_dev->queue_map_min);
1514                 return count;
1515         }
1516 
1517         if (!strcmp(name, "queue_map_max")) {
1518                 len = num_arg(&user_buffer[i], 5, &value);
1519                 if (len < 0)
1520                         return len;
1521 
1522                 i += len;
1523                 pkt_dev->queue_map_max = value;
1524                 sprintf(pg_result, "OK: queue_map_max=%u", pkt_dev->queue_map_max);
1525                 return count;
1526         }
1527 
1528         if (!strcmp(name, "mpls")) {
1529                 unsigned int n, cnt;
1530 
1531                 len = get_labels(&user_buffer[i], pkt_dev);
1532                 if (len < 0)
1533                         return len;
1534                 i += len;
1535                 cnt = sprintf(pg_result, "OK: mpls=");
1536                 for (n = 0; n < pkt_dev->nr_labels; n++)
1537                         cnt += sprintf(pg_result + cnt,
1538                                        "%08x%s", ntohl(pkt_dev->labels[n]),
1539                                        n == pkt_dev->nr_labels-1 ? "" : ",");
1540 
1541                 if (pkt_dev->nr_labels && pkt_dev->vlan_id != 0xffff) {
1542                         pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */
1543                         pkt_dev->svlan_id = 0xffff;
1544 
1545                         if (debug)
1546                                 pr_debug("VLAN/SVLAN auto turned off\n");
1547                 }
1548                 return count;
1549         }
1550 
1551         if (!strcmp(name, "vlan_id")) {
1552                 len = num_arg(&user_buffer[i], 4, &value);
1553                 if (len < 0)
1554                         return len;
1555 
1556                 i += len;
1557                 if (value <= 4095) {
1558                         pkt_dev->vlan_id = value;  /* turn on VLAN */
1559 
1560                         if (debug)
1561                                 pr_debug("VLAN turned on\n");
1562 
1563                         if (debug && pkt_dev->nr_labels)
1564                                 pr_debug("MPLS auto turned off\n");
1565 
1566                         pkt_dev->nr_labels = 0;    /* turn off MPLS */
1567                         sprintf(pg_result, "OK: vlan_id=%u", pkt_dev->vlan_id);
1568                 } else {
1569                         pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */
1570                         pkt_dev->svlan_id = 0xffff;
1571 
1572                         if (debug)
1573                                 pr_debug("VLAN/SVLAN turned off\n");
1574                 }
1575                 return count;
1576         }
1577 
1578         if (!strcmp(name, "vlan_p")) {
1579                 len = num_arg(&user_buffer[i], 1, &value);
1580                 if (len < 0)
1581                         return len;
1582 
1583                 i += len;
1584                 if ((value <= 7) && (pkt_dev->vlan_id != 0xffff)) {
1585                         pkt_dev->vlan_p = value;
1586                         sprintf(pg_result, "OK: vlan_p=%u", pkt_dev->vlan_p);
1587                 } else {
1588                         sprintf(pg_result, "ERROR: vlan_p must be 0-7");
1589                 }
1590                 return count;
1591         }
1592 
1593         if (!strcmp(name, "vlan_cfi")) {
1594                 len = num_arg(&user_buffer[i], 1, &value);
1595                 if (len < 0)
1596                         return len;
1597 
1598                 i += len;
1599                 if ((value <= 1) && (pkt_dev->vlan_id != 0xffff)) {
1600                         pkt_dev->vlan_cfi = value;
1601                         sprintf(pg_result, "OK: vlan_cfi=%u", pkt_dev->vlan_cfi);
1602                 } else {
1603                         sprintf(pg_result, "ERROR: vlan_cfi must be 0-1");
1604                 }
1605                 return count;
1606         }
1607 
1608         if (!strcmp(name, "svlan_id")) {
1609                 len = num_arg(&user_buffer[i], 4, &value);
1610                 if (len < 0)
1611                         return len;
1612 
1613                 i += len;
1614                 if ((value <= 4095) && ((pkt_dev->vlan_id != 0xffff))) {
1615                         pkt_dev->svlan_id = value;  /* turn on SVLAN */
1616 
1617                         if (debug)
1618                                 pr_debug("SVLAN turned on\n");
1619 
1620                         if (debug && pkt_dev->nr_labels)
1621                                 pr_debug("MPLS auto turned off\n");
1622 
1623                         pkt_dev->nr_labels = 0;    /* turn off MPLS */
1624                         sprintf(pg_result, "OK: svlan_id=%u", pkt_dev->svlan_id);
1625                 } else {
1626                         pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */
1627                         pkt_dev->svlan_id = 0xffff;
1628 
1629                         if (debug)
1630                                 pr_debug("VLAN/SVLAN turned off\n");
1631                 }
1632                 return count;
1633         }
1634 
1635         if (!strcmp(name, "svlan_p")) {
1636                 len = num_arg(&user_buffer[i], 1, &value);
1637                 if (len < 0)
1638                         return len;
1639 
1640                 i += len;
1641                 if ((value <= 7) && (pkt_dev->svlan_id != 0xffff)) {
1642                         pkt_dev->svlan_p = value;
1643                         sprintf(pg_result, "OK: svlan_p=%u", pkt_dev->svlan_p);
1644                 } else {
1645                         sprintf(pg_result, "ERROR: svlan_p must be 0-7");
1646                 }
1647                 return count;
1648         }
1649 
1650         if (!strcmp(name, "svlan_cfi")) {
1651                 len = num_arg(&user_buffer[i], 1, &value);
1652                 if (len < 0)
1653                         return len;
1654 
1655                 i += len;
1656                 if ((value <= 1) && (pkt_dev->svlan_id != 0xffff)) {
1657                         pkt_dev->svlan_cfi = value;
1658                         sprintf(pg_result, "OK: svlan_cfi=%u", pkt_dev->svlan_cfi);
1659                 } else {
1660                         sprintf(pg_result, "ERROR: svlan_cfi must be 0-1");
1661                 }
1662                 return count;
1663         }
1664 
1665         if (!strcmp(name, "tos")) {
1666                 __u32 tmp_value = 0;
1667                 len = hex32_arg(&user_buffer[i], 2, &tmp_value);
1668                 if (len < 0)
1669                         return len;
1670 
1671                 i += len;
1672                 if (len == 2) {
1673                         pkt_dev->tos = tmp_value;
1674                         sprintf(pg_result, "OK: tos=0x%02x", pkt_dev->tos);
1675                 } else {
1676                         sprintf(pg_result, "ERROR: tos must be 00-ff");
1677                 }
1678                 return count;
1679         }
1680 
1681         if (!strcmp(name, "traffic_class")) {
1682                 __u32 tmp_value = 0;
1683                 len = hex32_arg(&user_buffer[i], 2, &tmp_value);
1684                 if (len < 0)
1685                         return len;
1686 
1687                 i += len;
1688                 if (len == 2) {
1689                         pkt_dev->traffic_class = tmp_value;
1690                         sprintf(pg_result, "OK: traffic_class=0x%02x", pkt_dev->traffic_class);
1691                 } else {
1692                         sprintf(pg_result, "ERROR: traffic_class must be 00-ff");
1693                 }
1694                 return count;
1695         }
1696 
1697         if (!strcmp(name, "skb_priority")) {
1698                 len = num_arg(&user_buffer[i], 9, &value);
1699                 if (len < 0)
1700                         return len;
1701 
1702                 i += len;
1703                 pkt_dev->skb_priority = value;
1704                 sprintf(pg_result, "OK: skb_priority=%i",
1705                         pkt_dev->skb_priority);
1706                 return count;
1707         }
1708 
1709         sprintf(pkt_dev->result, "No such parameter \"%s\"", name);
1710         return -EINVAL;
1711 }
1712 
1713 static int pktgen_if_open(struct inode *inode, struct file *file)
1714 {
1715         return single_open(file, pktgen_if_show, PDE_DATA(inode));
1716 }
1717 
1718 static const struct file_operations pktgen_if_fops = {
1719         .open    = pktgen_if_open,
1720         .read    = seq_read,
1721         .llseek  = seq_lseek,
1722         .write   = pktgen_if_write,
1723         .release = single_release,
1724 };
1725 
1726 static int pktgen_thread_show(struct seq_file *seq, void *v)
1727 {
1728         struct pktgen_thread *t = seq->private;
1729         const struct pktgen_dev *pkt_dev;
1730 
1731         BUG_ON(!t);
1732 
1733         seq_puts(seq, "Running: ");
1734 
1735         rcu_read_lock();
1736         list_for_each_entry_rcu(pkt_dev, &t->if_list, list)
1737                 if (pkt_dev->running)
1738                         seq_printf(seq, "%s ", pkt_dev->odevname);
1739 
1740         seq_puts(seq, "\nStopped: ");
1741 
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         if (t->result[0])
1747                 seq_printf(seq, "\nResult: %s\n", t->result);
1748         else
1749                 seq_puts(seq, "\nResult: NA\n");
1750 
1751         rcu_read_unlock();
1752 
1753         return 0;
1754 }
1755 
1756 static ssize_t pktgen_thread_write(struct file *file,
1757                                    const char __user * user_buffer,
1758                                    size_t count, loff_t * offset)
1759 {
1760         struct seq_file *seq = file->private_data;
1761         struct pktgen_thread *t = seq->private;
1762         int i, max, len, ret;
1763         char name[40];
1764         char *pg_result;
1765 
1766         if (count < 1) {
1767                 //      sprintf(pg_result, "Wrong command format");
1768                 return -EINVAL;
1769         }
1770 
1771         max = count;
1772         len = count_trail_chars(user_buffer, max);
1773         if (len < 0)
1774                 return len;
1775 
1776         i = len;
1777 
1778         /* Read variable name */
1779 
1780         len = strn_len(&user_buffer[i], sizeof(name) - 1);
1781         if (len < 0)
1782                 return len;
1783 
1784         memset(name, 0, sizeof(name));
1785         if (copy_from_user(name, &user_buffer[i], len))
1786                 return -EFAULT;
1787         i += len;
1788 
1789         max = count - i;
1790         len = count_trail_chars(&user_buffer[i], max);
1791         if (len < 0)
1792                 return len;
1793 
1794         i += len;
1795 
1796         if (debug)
1797                 pr_debug("t=%s, count=%lu\n", name, (unsigned long)count);
1798 
1799         if (!t) {
1800                 pr_err("ERROR: No thread\n");
1801                 ret = -EINVAL;
1802                 goto out;
1803         }
1804 
1805         pg_result = &(t->result[0]);
1806 
1807         if (!strcmp(name, "add_device")) {
1808                 char f[32];
1809                 memset(f, 0, 32);
1810                 len = strn_len(&user_buffer[i], sizeof(f) - 1);
1811                 if (len < 0) {
1812                         ret = len;
1813                         goto out;
1814                 }
1815                 if (copy_from_user(f, &user_buffer[i], len))
1816                         return -EFAULT;
1817                 i += len;
1818                 mutex_lock(&pktgen_thread_lock);
1819                 ret = pktgen_add_device(t, f);
1820                 mutex_unlock(&pktgen_thread_lock);
1821                 if (!ret) {
1822                         ret = count;
1823                         sprintf(pg_result, "OK: add_device=%s", f);
1824                 } else
1825                         sprintf(pg_result, "ERROR: can not add device %s", f);
1826                 goto out;
1827         }
1828 
1829         if (!strcmp(name, "rem_device_all")) {
1830                 mutex_lock(&pktgen_thread_lock);
1831                 t->control |= T_REMDEVALL;
1832                 mutex_unlock(&pktgen_thread_lock);
1833                 schedule_timeout_interruptible(msecs_to_jiffies(125));  /* Propagate thread->control  */
1834                 ret = count;
1835                 sprintf(pg_result, "OK: rem_device_all");
1836                 goto out;
1837         }
1838 
1839         if (!strcmp(name, "max_before_softirq")) {
1840                 sprintf(pg_result, "OK: Note! max_before_softirq is obsoleted -- Do not use");
1841                 ret = count;
1842                 goto out;
1843         }
1844 
1845         ret = -EINVAL;
1846 out:
1847         return ret;
1848 }
1849 
1850 static int pktgen_thread_open(struct inode *inode, struct file *file)
1851 {
1852         return single_open(file, pktgen_thread_show, PDE_DATA(inode));
1853 }
1854 
1855 static const struct file_operations pktgen_thread_fops = {
1856         .open    = pktgen_thread_open,
1857         .read    = seq_read,
1858         .llseek  = seq_lseek,
1859         .write   = pktgen_thread_write,
1860         .release = single_release,
1861 };
1862 
1863 /* Think find or remove for NN */
1864 static struct pktgen_dev *__pktgen_NN_threads(const struct pktgen_net *pn,
1865                                               const char *ifname, int remove)
1866 {
1867         struct pktgen_thread *t;
1868         struct pktgen_dev *pkt_dev = NULL;
1869         bool exact = (remove == FIND);
1870 
1871         list_for_each_entry(t, &pn->pktgen_threads, th_list) {
1872                 pkt_dev = pktgen_find_dev(t, ifname, exact);
1873                 if (pkt_dev) {
1874                         if (remove) {
1875                                 pkt_dev->removal_mark = 1;
1876                                 t->control |= T_REMDEV;
1877                         }
1878                         break;
1879                 }
1880         }
1881         return pkt_dev;
1882 }
1883 
1884 /*
1885  * mark a device for removal
1886  */
1887 static void pktgen_mark_device(const struct pktgen_net *pn, const char *ifname)
1888 {
1889         struct pktgen_dev *pkt_dev = NULL;
1890         const int max_tries = 10, msec_per_try = 125;
1891         int i = 0;
1892 
1893         mutex_lock(&pktgen_thread_lock);
1894         pr_debug("%s: marking %s for removal\n", __func__, ifname);
1895 
1896         while (1) {
1897 
1898                 pkt_dev = __pktgen_NN_threads(pn, ifname, REMOVE);
1899                 if (pkt_dev == NULL)
1900                         break;  /* success */
1901 
1902                 mutex_unlock(&pktgen_thread_lock);
1903                 pr_debug("%s: waiting for %s to disappear....\n",
1904                          __func__, ifname);
1905                 schedule_timeout_interruptible(msecs_to_jiffies(msec_per_try));
1906                 mutex_lock(&pktgen_thread_lock);
1907 
1908                 if (++i >= max_tries) {
1909                         pr_err("%s: timed out after waiting %d msec for device %s to be removed\n",
1910                                __func__, msec_per_try * i, ifname);
1911                         break;
1912                 }
1913 
1914         }
1915 
1916         mutex_unlock(&pktgen_thread_lock);
1917 }
1918 
1919 static void pktgen_change_name(const struct pktgen_net *pn, struct net_device *dev)
1920 {
1921         struct pktgen_thread *t;
1922 
1923         mutex_lock(&pktgen_thread_lock);
1924 
1925         list_for_each_entry(t, &pn->pktgen_threads, th_list) {
1926                 struct pktgen_dev *pkt_dev;
1927 
1928                 if_lock(t);
1929                 list_for_each_entry(pkt_dev, &t->if_list, list) {
1930                         if (pkt_dev->odev != dev)
1931                                 continue;
1932 
1933                         proc_remove(pkt_dev->entry);
1934 
1935                         pkt_dev->entry = proc_create_data(dev->name, 0600,
1936                                                           pn->proc_dir,
1937                                                           &pktgen_if_fops,
1938                                                           pkt_dev);
1939                         if (!pkt_dev->entry)
1940                                 pr_err("can't move proc entry for '%s'\n",
1941                                        dev->name);
1942                         break;
1943                 }
1944                 if_unlock(t);
1945         }
1946         mutex_unlock(&pktgen_thread_lock);
1947 }
1948 
1949 static int pktgen_device_event(struct notifier_block *unused,
1950                                unsigned long event, void *ptr)
1951 {
1952         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1953         struct pktgen_net *pn = net_generic(dev_net(dev), pg_net_id);
1954 
1955         if (pn->pktgen_exiting)
1956                 return NOTIFY_DONE;
1957 
1958         /* It is OK that we do not hold the group lock right now,
1959          * as we run under the RTNL lock.
1960          */
1961 
1962         switch (event) {
1963         case NETDEV_CHANGENAME:
1964                 pktgen_change_name(pn, dev);
1965                 break;
1966 
1967         case NETDEV_UNREGISTER:
1968                 pktgen_mark_device(pn, dev->name);
1969                 break;
1970         }
1971 
1972         return NOTIFY_DONE;
1973 }
1974 
1975 static struct net_device *pktgen_dev_get_by_name(const struct pktgen_net *pn,
1976                                                  struct pktgen_dev *pkt_dev,
1977                                                  const char *ifname)
1978 {
1979         char b[IFNAMSIZ+5];
1980         int i;
1981 
1982         for (i = 0; ifname[i] != '@'; i++) {
1983                 if (i == IFNAMSIZ)
1984                         break;
1985 
1986                 b[i] = ifname[i];
1987         }
1988         b[i] = 0;
1989 
1990         return dev_get_by_name(pn->net, b);
1991 }
1992 
1993 
1994 /* Associate pktgen_dev with a device. */
1995 
1996 static int pktgen_setup_dev(const struct pktgen_net *pn,
1997                             struct pktgen_dev *pkt_dev, const char *ifname)
1998 {
1999         struct net_device *odev;
2000         int err;
2001 
2002         /* Clean old setups */
2003         if (pkt_dev->odev) {
2004                 dev_put(pkt_dev->odev);
2005                 pkt_dev->odev = NULL;
2006         }
2007 
2008         odev = pktgen_dev_get_by_name(pn, pkt_dev, ifname);
2009         if (!odev) {
2010                 pr_err("no such netdevice: \"%s\"\n", ifname);
2011                 return -ENODEV;
2012         }
2013 
2014         if (odev->type != ARPHRD_ETHER) {
2015                 pr_err("not an ethernet device: \"%s\"\n", ifname);
2016                 err = -EINVAL;
2017         } else if (!netif_running(odev)) {
2018                 pr_err("device is down: \"%s\"\n", ifname);
2019                 err = -ENETDOWN;
2020         } else {
2021                 pkt_dev->odev = odev;
2022                 return 0;
2023         }
2024 
2025         dev_put(odev);
2026         return err;
2027 }
2028 
2029 /* Read pkt_dev from the interface and set up internal pktgen_dev
2030  * structure to have the right information to create/send packets
2031  */
2032 static void pktgen_setup_inject(struct pktgen_dev *pkt_dev)
2033 {
2034         int ntxq;
2035 
2036         if (!pkt_dev->odev) {
2037                 pr_err("ERROR: pkt_dev->odev == NULL in setup_inject\n");
2038                 sprintf(pkt_dev->result,
2039                         "ERROR: pkt_dev->odev == NULL in setup_inject.\n");
2040                 return;
2041         }
2042 
2043         /* make sure that we don't pick a non-existing transmit queue */
2044         ntxq = pkt_dev->odev->real_num_tx_queues;
2045 
2046         if (ntxq <= pkt_dev->queue_map_min) {
2047                 pr_warn("WARNING: Requested queue_map_min (zero-based) (%d) exceeds valid range [0 - %d] for (%d) queues on %s, resetting\n",
2048                         pkt_dev->queue_map_min, (ntxq ?: 1) - 1, ntxq,
2049                         pkt_dev->odevname);
2050                 pkt_dev->queue_map_min = (ntxq ?: 1) - 1;
2051         }
2052         if (pkt_dev->queue_map_max >= ntxq) {
2053                 pr_warn("WARNING: Requested queue_map_max (zero-based) (%d) exceeds valid range [0 - %d] for (%d) queues on %s, resetting\n",
2054                         pkt_dev->queue_map_max, (ntxq ?: 1) - 1, ntxq,
2055                         pkt_dev->odevname);
2056                 pkt_dev->queue_map_max = (ntxq ?: 1) - 1;
2057         }
2058 
2059         /* Default to the interface's mac if not explicitly set. */
2060 
2061         if (is_zero_ether_addr(pkt_dev->src_mac))
2062                 ether_addr_copy(&(pkt_dev->hh[6]), pkt_dev->odev->dev_addr);
2063 
2064         /* Set up Dest MAC */
2065         ether_addr_copy(&(pkt_dev->hh[0]), pkt_dev->dst_mac);
2066 
2067         if (pkt_dev->flags & F_IPV6) {
2068                 int i, set = 0, err = 1;
2069                 struct inet6_dev *idev;
2070 
2071                 if (pkt_dev->min_pkt_size == 0) {
2072                         pkt_dev->min_pkt_size = 14 + sizeof(struct ipv6hdr)
2073                                                 + sizeof(struct udphdr)
2074                                                 + sizeof(struct pktgen_hdr)
2075                                                 + pkt_dev->pkt_overhead;
2076                 }
2077 
2078                 for (i = 0; i < sizeof(struct in6_addr); i++)
2079                         if (pkt_dev->cur_in6_saddr.s6_addr[i]) {
2080                                 set = 1;
2081                                 break;
2082                         }
2083 
2084                 if (!set) {
2085 
2086                         /*
2087                          * Use linklevel address if unconfigured.
2088                          *
2089                          * use ipv6_get_lladdr if/when it's get exported
2090                          */
2091 
2092                         rcu_read_lock();
2093                         idev = __in6_dev_get(pkt_dev->odev);
2094                         if (idev) {
2095                                 struct inet6_ifaddr *ifp;
2096 
2097                                 read_lock_bh(&idev->lock);
2098                                 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2099                                         if ((ifp->scope & IFA_LINK) &&
2100                                             !(ifp->flags & IFA_F_TENTATIVE)) {
2101                                                 pkt_dev->cur_in6_saddr = ifp->addr;
2102                                                 err = 0;
2103                                                 break;
2104                                         }
2105                                 }
2106                                 read_unlock_bh(&idev->lock);
2107                         }
2108                         rcu_read_unlock();
2109                         if (err)
2110                                 pr_err("ERROR: IPv6 link address not available\n");
2111                 }
2112         } else {
2113                 if (pkt_dev->min_pkt_size == 0) {
2114                         pkt_dev->min_pkt_size = 14 + sizeof(struct iphdr)
2115                                                 + sizeof(struct udphdr)
2116                                                 + sizeof(struct pktgen_hdr)
2117                                                 + pkt_dev->pkt_overhead;
2118                 }
2119 
2120                 pkt_dev->saddr_min = 0;
2121                 pkt_dev->saddr_max = 0;
2122                 if (strlen(pkt_dev->src_min) == 0) {
2123 
2124                         struct in_device *in_dev;
2125 
2126                         rcu_read_lock();
2127                         in_dev = __in_dev_get_rcu(pkt_dev->odev);
2128                         if (in_dev) {
2129                                 if (in_dev->ifa_list) {
2130                                         pkt_dev->saddr_min =
2131                                             in_dev->ifa_list->ifa_address;
2132                                         pkt_dev->saddr_max = pkt_dev->saddr_min;
2133                                 }
2134                         }
2135                         rcu_read_unlock();
2136                 } else {
2137                         pkt_dev->saddr_min = in_aton(pkt_dev->src_min);
2138                         pkt_dev->saddr_max = in_aton(pkt_dev->src_max);
2139                 }
2140 
2141                 pkt_dev->daddr_min = in_aton(pkt_dev->dst_min);
2142                 pkt_dev->daddr_max = in_aton(pkt_dev->dst_max);
2143         }
2144         /* Initialize current values. */
2145         pkt_dev->cur_pkt_size = pkt_dev->min_pkt_size;
2146         if (pkt_dev->min_pkt_size > pkt_dev->max_pkt_size)
2147                 pkt_dev->max_pkt_size = pkt_dev->min_pkt_size;
2148 
2149         pkt_dev->cur_dst_mac_offset = 0;
2150         pkt_dev->cur_src_mac_offset = 0;
2151         pkt_dev->cur_saddr = pkt_dev->saddr_min;
2152         pkt_dev->cur_daddr = pkt_dev->daddr_min;
2153         pkt_dev->cur_udp_dst = pkt_dev->udp_dst_min;
2154         pkt_dev->cur_udp_src = pkt_dev->udp_src_min;
2155         pkt_dev->nflows = 0;
2156 }
2157 
2158 
2159 static void spin(struct pktgen_dev *pkt_dev, ktime_t spin_until)
2160 {
2161         ktime_t start_time, end_time;
2162         s64 remaining;
2163         struct hrtimer_sleeper t;
2164 
2165         hrtimer_init_on_stack(&t.timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
2166         hrtimer_set_expires(&t.timer, spin_until);
2167 
2168         remaining = ktime_to_ns(hrtimer_expires_remaining(&t.timer));
2169         if (remaining <= 0)
2170                 goto out;
2171 
2172         start_time = ktime_get();
2173         if (remaining < 100000) {
2174                 /* for small delays (<100us), just loop until limit is reached */
2175                 do {
2176                         end_time = ktime_get();
2177                 } while (ktime_compare(end_time, spin_until) < 0);
2178         } else {
2179                 /* see do_nanosleep */
2180                 hrtimer_init_sleeper(&t, current);
2181                 do {
2182                         set_current_state(TASK_INTERRUPTIBLE);
2183                         hrtimer_start_expires(&t.timer, HRTIMER_MODE_ABS);
2184 
2185                         if (likely(t.task))
2186                                 schedule();
2187 
2188                         hrtimer_cancel(&t.timer);
2189                 } while (t.task && pkt_dev->running && !signal_pending(current));
2190                 __set_current_state(TASK_RUNNING);
2191                 end_time = ktime_get();
2192         }
2193 
2194         pkt_dev->idle_acc += ktime_to_ns(ktime_sub(end_time, start_time));
2195 out:
2196         pkt_dev->next_tx = ktime_add_ns(spin_until, pkt_dev->delay);
2197         destroy_hrtimer_on_stack(&t.timer);
2198 }
2199 
2200 static inline void set_pkt_overhead(struct pktgen_dev *pkt_dev)
2201 {
2202         pkt_dev->pkt_overhead = 0;
2203         pkt_dev->pkt_overhead += pkt_dev->nr_labels*sizeof(u32);
2204         pkt_dev->pkt_overhead += VLAN_TAG_SIZE(pkt_dev);
2205         pkt_dev->pkt_overhead += SVLAN_TAG_SIZE(pkt_dev);
2206 }
2207 
2208 static inline int f_seen(const struct pktgen_dev *pkt_dev, int flow)
2209 {
2210         return !!(pkt_dev->flows[flow].flags & F_INIT);
2211 }
2212 
2213 static inline int f_pick(struct pktgen_dev *pkt_dev)
2214 {
2215         int flow = pkt_dev->curfl;
2216 
2217         if (pkt_dev->flags & F_FLOW_SEQ) {
2218                 if (pkt_dev->flows[flow].count >= pkt_dev->lflow) {
2219                         /* reset time */
2220                         pkt_dev->flows[flow].count = 0;
2221                         pkt_dev->flows[flow].flags = 0;
2222                         pkt_dev->curfl += 1;
2223                         if (pkt_dev->curfl >= pkt_dev->cflows)
2224                                 pkt_dev->curfl = 0; /*reset */
2225                 }
2226         } else {
2227                 flow = prandom_u32() % pkt_dev->cflows;
2228                 pkt_dev->curfl = flow;
2229 
2230                 if (pkt_dev->flows[flow].count > pkt_dev->lflow) {
2231                         pkt_dev->flows[flow].count = 0;
2232                         pkt_dev->flows[flow].flags = 0;
2233                 }
2234         }
2235 
2236         return pkt_dev->curfl;
2237 }
2238 
2239 
2240 #ifdef CONFIG_XFRM
2241 /* If there was already an IPSEC SA, we keep it as is, else
2242  * we go look for it ...
2243 */
2244 #define DUMMY_MARK 0
2245 static void get_ipsec_sa(struct pktgen_dev *pkt_dev, int flow)
2246 {
2247         struct xfrm_state *x = pkt_dev->flows[flow].x;
2248         struct pktgen_net *pn = net_generic(dev_net(pkt_dev->odev), pg_net_id);
2249         if (!x) {
2250 
2251                 if (pkt_dev->spi) {
2252                         /* We need as quick as possible to find the right SA
2253                          * Searching with minimum criteria to archieve this.
2254                          */
2255                         x = xfrm_state_lookup_byspi(pn->net, htonl(pkt_dev->spi), AF_INET);
2256                 } else {
2257                         /* slow path: we dont already have xfrm_state */
2258                         x = xfrm_stateonly_find(pn->net, DUMMY_MARK,
2259                                                 (xfrm_address_t *)&pkt_dev->cur_daddr,
2260                                                 (xfrm_address_t *)&pkt_dev->cur_saddr,
2261                                                 AF_INET,
2262                                                 pkt_dev->ipsmode,
2263                                                 pkt_dev->ipsproto, 0);
2264                 }
2265                 if (x) {
2266                         pkt_dev->flows[flow].x = x;
2267                         set_pkt_overhead(pkt_dev);
2268                         pkt_dev->pkt_overhead += x->props.header_len;
2269                 }
2270 
2271         }
2272 }
2273 #endif
2274 static void set_cur_queue_map(struct pktgen_dev *pkt_dev)
2275 {
2276 
2277         if (pkt_dev->flags & F_QUEUE_MAP_CPU)
2278                 pkt_dev->cur_queue_map = smp_processor_id();
2279 
2280         else if (pkt_dev->queue_map_min <= pkt_dev->queue_map_max) {
2281                 __u16 t;
2282                 if (pkt_dev->flags & F_QUEUE_MAP_RND) {
2283                         t = prandom_u32() %
2284                                 (pkt_dev->queue_map_max -
2285                                  pkt_dev->queue_map_min + 1)
2286                                 + pkt_dev->queue_map_min;
2287                 } else {
2288                         t = pkt_dev->cur_queue_map + 1;
2289                         if (t > pkt_dev->queue_map_max)
2290                                 t = pkt_dev->queue_map_min;
2291                 }
2292                 pkt_dev->cur_queue_map = t;
2293         }
2294         pkt_dev->cur_queue_map  = pkt_dev->cur_queue_map % pkt_dev->odev->real_num_tx_queues;
2295 }
2296 
2297 /* Increment/randomize headers according to flags and current values
2298  * for IP src/dest, UDP src/dst port, MAC-Addr src/dst
2299  */
2300 static void mod_cur_headers(struct pktgen_dev *pkt_dev)
2301 {
2302         __u32 imn;
2303         __u32 imx;
2304         int flow = 0;
2305 
2306         if (pkt_dev->cflows)
2307                 flow = f_pick(pkt_dev);
2308 
2309         /*  Deal with source MAC */
2310         if (pkt_dev->src_mac_count > 1) {
2311                 __u32 mc;
2312                 __u32 tmp;
2313 
2314                 if (pkt_dev->flags & F_MACSRC_RND)
2315                         mc = prandom_u32() % pkt_dev->src_mac_count;
2316                 else {
2317                         mc = pkt_dev->cur_src_mac_offset++;
2318                         if (pkt_dev->cur_src_mac_offset >=
2319                             pkt_dev->src_mac_count)
2320                                 pkt_dev->cur_src_mac_offset = 0;
2321                 }
2322 
2323                 tmp = pkt_dev->src_mac[5] + (mc & 0xFF);
2324                 pkt_dev->hh[11] = tmp;
2325                 tmp = (pkt_dev->src_mac[4] + ((mc >> 8) & 0xFF) + (tmp >> 8));
2326                 pkt_dev->hh[10] = tmp;
2327                 tmp = (pkt_dev->src_mac[3] + ((mc >> 16) & 0xFF) + (tmp >> 8));
2328                 pkt_dev->hh[9] = tmp;
2329                 tmp = (pkt_dev->src_mac[2] + ((mc >> 24) & 0xFF) + (tmp >> 8));
2330                 pkt_dev->hh[8] = tmp;
2331                 tmp = (pkt_dev->src_mac[1] + (tmp >> 8));
2332                 pkt_dev->hh[7] = tmp;
2333         }
2334 
2335         /*  Deal with Destination MAC */
2336         if (pkt_dev->dst_mac_count > 1) {
2337                 __u32 mc;
2338                 __u32 tmp;
2339 
2340                 if (pkt_dev->flags & F_MACDST_RND)
2341                         mc = prandom_u32() % pkt_dev->dst_mac_count;
2342 
2343                 else {
2344                         mc = pkt_dev->cur_dst_mac_offset++;
2345                         if (pkt_dev->cur_dst_mac_offset >=
2346                             pkt_dev->dst_mac_count) {
2347                                 pkt_dev->cur_dst_mac_offset = 0;
2348                         }
2349                 }
2350 
2351                 tmp = pkt_dev->dst_mac[5] + (mc & 0xFF);
2352                 pkt_dev->hh[5] = tmp;
2353                 tmp = (pkt_dev->dst_mac[4] + ((mc >> 8) & 0xFF) + (tmp >> 8));
2354                 pkt_dev->hh[4] = tmp;
2355                 tmp = (pkt_dev->dst_mac[3] + ((mc >> 16) & 0xFF) + (tmp >> 8));
2356                 pkt_dev->hh[3] = tmp;
2357                 tmp = (pkt_dev->dst_mac[2] + ((mc >> 24) & 0xFF) + (tmp >> 8));
2358                 pkt_dev->hh[2] = tmp;
2359                 tmp = (pkt_dev->dst_mac[1] + (tmp >> 8));
2360                 pkt_dev->hh[1] = tmp;
2361         }
2362 
2363         if (pkt_dev->flags & F_MPLS_RND) {
2364                 unsigned int i;
2365                 for (i = 0; i < pkt_dev->nr_labels; i++)
2366                         if (pkt_dev->labels[i] & MPLS_STACK_BOTTOM)
2367                                 pkt_dev->labels[i] = MPLS_STACK_BOTTOM |
2368                                              ((__force __be32)prandom_u32() &
2369                                                       htonl(0x000fffff));
2370         }
2371 
2372         if ((pkt_dev->flags & F_VID_RND) && (pkt_dev->vlan_id != 0xffff)) {
2373                 pkt_dev->vlan_id = prandom_u32() & (4096 - 1);
2374         }
2375 
2376         if ((pkt_dev->flags & F_SVID_RND) && (pkt_dev->svlan_id != 0xffff)) {
2377                 pkt_dev->svlan_id = prandom_u32() & (4096 - 1);
2378         }
2379 
2380         if (pkt_dev->udp_src_min < pkt_dev->udp_src_max) {
2381                 if (pkt_dev->flags & F_UDPSRC_RND)
2382                         pkt_dev->cur_udp_src = prandom_u32() %
2383                                 (pkt_dev->udp_src_max - pkt_dev->udp_src_min)
2384                                 + pkt_dev->udp_src_min;
2385 
2386                 else {
2387                         pkt_dev->cur_udp_src++;
2388                         if (pkt_dev->cur_udp_src >= pkt_dev->udp_src_max)
2389                                 pkt_dev->cur_udp_src = pkt_dev->udp_src_min;
2390                 }
2391         }
2392 
2393         if (pkt_dev->udp_dst_min < pkt_dev->udp_dst_max) {
2394                 if (pkt_dev->flags & F_UDPDST_RND) {
2395                         pkt_dev->cur_udp_dst = prandom_u32() %
2396                                 (pkt_dev->udp_dst_max - pkt_dev->udp_dst_min)
2397                                 + pkt_dev->udp_dst_min;
2398                 } else {
2399                         pkt_dev->cur_udp_dst++;
2400                         if (pkt_dev->cur_udp_dst >= pkt_dev->udp_dst_max)
2401                                 pkt_dev->cur_udp_dst = pkt_dev->udp_dst_min;
2402                 }
2403         }
2404 
2405         if (!(pkt_dev->flags & F_IPV6)) {
2406 
2407                 imn = ntohl(pkt_dev->saddr_min);
2408                 imx = ntohl(pkt_dev->saddr_max);
2409                 if (imn < imx) {
2410                         __u32 t;
2411                         if (pkt_dev->flags & F_IPSRC_RND)
2412                                 t = prandom_u32() % (imx - imn) + imn;
2413                         else {
2414                                 t = ntohl(pkt_dev->cur_saddr);
2415                                 t++;
2416                                 if (t > imx)
2417                                         t = imn;
2418 
2419                         }
2420                         pkt_dev->cur_saddr = htonl(t);
2421                 }
2422 
2423                 if (pkt_dev->cflows && f_seen(pkt_dev, flow)) {
2424                         pkt_dev->cur_daddr = pkt_dev->flows[flow].cur_daddr;
2425                 } else {
2426                         imn = ntohl(pkt_dev->daddr_min);
2427                         imx = ntohl(pkt_dev->daddr_max);
2428                         if (imn < imx) {
2429                                 __u32 t;
2430                                 __be32 s;
2431                                 if (pkt_dev->flags & F_IPDST_RND) {
2432 
2433                                         do {
2434                                                 t = prandom_u32() %
2435                                                         (imx - imn) + imn;
2436                                                 s = htonl(t);
2437                                         } while (ipv4_is_loopback(s) ||
2438                                                 ipv4_is_multicast(s) ||
2439                                                 ipv4_is_lbcast(s) ||
2440                                                 ipv4_is_zeronet(s) ||
2441                                                 ipv4_is_local_multicast(s));
2442                                         pkt_dev->cur_daddr = s;
2443                                 } else {
2444                                         t = ntohl(pkt_dev->cur_daddr);
2445                                         t++;
2446                                         if (t > imx) {
2447                                                 t = imn;
2448                                         }
2449                                         pkt_dev->cur_daddr = htonl(t);
2450                                 }
2451                         }
2452                         if (pkt_dev->cflows) {
2453                                 pkt_dev->flows[flow].flags |= F_INIT;
2454                                 pkt_dev->flows[flow].cur_daddr =
2455                                     pkt_dev->cur_daddr;
2456 #ifdef CONFIG_XFRM
2457                                 if (pkt_dev->flags & F_IPSEC)
2458                                         get_ipsec_sa(pkt_dev, flow);
2459 #endif
2460                                 pkt_dev->nflows++;
2461                         }
2462                 }
2463         } else {                /* IPV6 * */
2464 
2465                 if (!ipv6_addr_any(&pkt_dev->min_in6_daddr)) {
2466                         int i;
2467 
2468                         /* Only random destinations yet */
2469 
2470                         for (i = 0; i < 4; i++) {
2471                                 pkt_dev->cur_in6_daddr.s6_addr32[i] =
2472                                     (((__force __be32)prandom_u32() |
2473                                       pkt_dev->min_in6_daddr.s6_addr32[i]) &
2474                                      pkt_dev->max_in6_daddr.s6_addr32[i]);
2475                         }
2476                 }
2477         }
2478 
2479         if (pkt_dev->min_pkt_size < pkt_dev->max_pkt_size) {
2480                 __u32 t;
2481                 if (pkt_dev->flags & F_TXSIZE_RND) {
2482                         t = prandom_u32() %
2483                                 (pkt_dev->max_pkt_size - pkt_dev->min_pkt_size)
2484                                 + pkt_dev->min_pkt_size;
2485                 } else {
2486                         t = pkt_dev->cur_pkt_size + 1;
2487                         if (t > pkt_dev->max_pkt_size)
2488                                 t = pkt_dev->min_pkt_size;
2489                 }
2490                 pkt_dev->cur_pkt_size = t;
2491         }
2492 
2493         set_cur_queue_map(pkt_dev);
2494 
2495         pkt_dev->flows[flow].count++;
2496 }
2497 
2498 
2499 #ifdef CONFIG_XFRM
2500 static u32 pktgen_dst_metrics[RTAX_MAX + 1] = {
2501 
2502         [RTAX_HOPLIMIT] = 0x5, /* Set a static hoplimit */
2503 };
2504 
2505 static int pktgen_output_ipsec(struct sk_buff *skb, struct pktgen_dev *pkt_dev)
2506 {
2507         struct xfrm_state *x = pkt_dev->flows[pkt_dev->curfl].x;
2508         int err = 0;
2509         struct net *net = dev_net(pkt_dev->odev);
2510 
2511         if (!x)
2512                 return 0;
2513         /* XXX: we dont support tunnel mode for now until
2514          * we resolve the dst issue */
2515         if ((x->props.mode != XFRM_MODE_TRANSPORT) && (pkt_dev->spi == 0))
2516                 return 0;
2517 
2518         /* But when user specify an valid SPI, transformation
2519          * supports both transport/tunnel mode + ESP/AH type.
2520          */
2521         if ((x->props.mode == XFRM_MODE_TUNNEL) && (pkt_dev->spi != 0))
2522                 skb->_skb_refdst = (unsigned long)&pkt_dev->xdst.u.dst | SKB_DST_NOREF;
2523 
2524         rcu_read_lock_bh();
2525         err = x->outer_mode->output(x, skb);
2526         rcu_read_unlock_bh();
2527         if (err) {
2528                 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEMODEERROR);
2529                 goto error;
2530         }
2531         err = x->type->output(x, skb);
2532         if (err) {
2533                 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEPROTOERROR);
2534                 goto error;
2535         }
2536         spin_lock_bh(&x->lock);
2537         x->curlft.bytes += skb->len;
2538         x->curlft.packets++;
2539         spin_unlock_bh(&x->lock);
2540 error:
2541         return err;
2542 }
2543 
2544 static void free_SAs(struct pktgen_dev *pkt_dev)
2545 {
2546         if (pkt_dev->cflows) {
2547                 /* let go of the SAs if we have them */
2548                 int i;
2549                 for (i = 0; i < pkt_dev->cflows; i++) {
2550                         struct xfrm_state *x = pkt_dev->flows[i].x;
2551                         if (x) {
2552                                 xfrm_state_put(x);
2553                                 pkt_dev->flows[i].x = NULL;
2554                         }
2555                 }
2556         }
2557 }
2558 
2559 static int process_ipsec(struct pktgen_dev *pkt_dev,
2560                               struct sk_buff *skb, __be16 protocol)
2561 {
2562         if (pkt_dev->flags & F_IPSEC) {
2563                 struct xfrm_state *x = pkt_dev->flows[pkt_dev->curfl].x;
2564                 int nhead = 0;
2565                 if (x) {
2566                         struct ethhdr *eth;
2567                         struct iphdr *iph;
2568                         int ret;
2569 
2570                         nhead = x->props.header_len - skb_headroom(skb);
2571                         if (nhead > 0) {
2572                                 ret = pskb_expand_head(skb, nhead, 0, GFP_ATOMIC);
2573                                 if (ret < 0) {
2574                                         pr_err("Error expanding ipsec packet %d\n",
2575                                                ret);
2576                                         goto err;
2577                                 }
2578                         }
2579 
2580                         /* ipsec is not expecting ll header */
2581                         skb_pull(skb, ETH_HLEN);
2582                         ret = pktgen_output_ipsec(skb, pkt_dev);
2583                         if (ret) {
2584                                 pr_err("Error creating ipsec packet %d\n", ret);
2585                                 goto err;
2586                         }
2587                         /* restore ll */
2588                         eth = skb_push(skb, ETH_HLEN);
2589                         memcpy(eth, pkt_dev->hh, 2 * ETH_ALEN);
2590                         eth->h_proto = protocol;
2591 
2592                         /* Update IPv4 header len as well as checksum value */
2593                         iph = ip_hdr(skb);
2594                         iph->tot_len = htons(skb->len - ETH_HLEN);
2595                         ip_send_check(iph);
2596                 }
2597         }
2598         return 1;
2599 err:
2600         kfree_skb(skb);
2601         return 0;
2602 }
2603 #endif
2604 
2605 static void mpls_push(__be32 *mpls, struct pktgen_dev *pkt_dev)
2606 {
2607         unsigned int i;
2608         for (i = 0; i < pkt_dev->nr_labels; i++)
2609                 *mpls++ = pkt_dev->labels[i] & ~MPLS_STACK_BOTTOM;
2610 
2611         mpls--;
2612         *mpls |= MPLS_STACK_BOTTOM;
2613 }
2614 
2615 static inline __be16 build_tci(unsigned int id, unsigned int cfi,
2616                                unsigned int prio)
2617 {
2618         return htons(id | (cfi << 12) | (prio << 13));
2619 }
2620 
2621 static void pktgen_finalize_skb(struct pktgen_dev *pkt_dev, struct sk_buff *skb,
2622                                 int datalen)
2623 {
2624         struct timespec64 timestamp;
2625         struct pktgen_hdr *pgh;
2626 
2627         pgh = skb_put(skb, sizeof(*pgh));
2628         datalen -= sizeof(*pgh);
2629 
2630         if (pkt_dev->nfrags <= 0) {
2631                 skb_put_zero(skb, datalen);
2632         } else {
2633                 int frags = pkt_dev->nfrags;
2634                 int i, len;
2635                 int frag_len;
2636 
2637 
2638                 if (frags > MAX_SKB_FRAGS)
2639                         frags = MAX_SKB_FRAGS;
2640                 len = datalen - frags * PAGE_SIZE;
2641                 if (len > 0) {
2642                         skb_put_zero(skb, len);
2643                         datalen = frags * PAGE_SIZE;
2644                 }
2645 
2646                 i = 0;
2647                 frag_len = (datalen/frags) < PAGE_SIZE ?
2648                            (datalen/frags) : PAGE_SIZE;
2649                 while (datalen > 0) {
2650                         if (unlikely(!pkt_dev->page)) {
2651                                 int node = numa_node_id();
2652 
2653                                 if (pkt_dev->node >= 0 && (pkt_dev->flags & F_NODE))
2654                                         node = pkt_dev->node;
2655                                 pkt_dev->page = alloc_pages_node(node, GFP_KERNEL | __GFP_ZERO, 0);
2656                                 if (!pkt_dev->page)
2657                                         break;
2658                         }
2659                         get_page(pkt_dev->page);
2660                         skb_frag_set_page(skb, i, pkt_dev->page);
2661                         skb_shinfo(skb)->frags[i].page_offset = 0;
2662                         /*last fragment, fill rest of data*/
2663                         if (i == (frags - 1))
2664                                 skb_frag_size_set(&skb_shinfo(skb)->frags[i],
2665                                     (datalen < PAGE_SIZE ? datalen : PAGE_SIZE));
2666                         else
2667                                 skb_frag_size_set(&skb_shinfo(skb)->frags[i], frag_len);
2668                         datalen -= skb_frag_size(&skb_shinfo(skb)->frags[i]);
2669                         skb->len += skb_frag_size(&skb_shinfo(skb)->frags[i]);
2670                         skb->data_len += skb_frag_size(&skb_shinfo(skb)->frags[i]);
2671                         i++;
2672                         skb_shinfo(skb)->nr_frags = i;
2673                 }
2674         }
2675 
2676         /* Stamp the time, and sequence number,
2677          * convert them to network byte order
2678          */
2679         pgh->pgh_magic = htonl(PKTGEN_MAGIC);
2680         pgh->seq_num = htonl(pkt_dev->seq_num);
2681 
2682         if (pkt_dev->flags & F_NO_TIMESTAMP) {
2683                 pgh->tv_sec = 0;
2684                 pgh->tv_usec = 0;
2685         } else {
2686                 /*
2687                  * pgh->tv_sec wraps in y2106 when interpreted as unsigned
2688                  * as done by wireshark, or y2038 when interpreted as signed.
2689                  * This is probably harmless, but if anyone wants to improve
2690                  * it, we could introduce a variant that puts 64-bit nanoseconds
2691                  * into the respective header bytes.
2692                  * This would also be slightly faster to read.
2693                  */
2694                 ktime_get_real_ts64(&timestamp);
2695                 pgh->tv_sec = htonl(timestamp.tv_sec);
2696                 pgh->tv_usec = htonl(timestamp.tv_nsec / NSEC_PER_USEC);
2697         }
2698 }
2699 
2700 static struct sk_buff *pktgen_alloc_skb(struct net_device *dev,
2701                                         struct pktgen_dev *pkt_dev)
2702 {
2703         unsigned int extralen = LL_RESERVED_SPACE(dev);
2704         struct sk_buff *skb = NULL;
2705         unsigned int size;
2706 
2707         size = pkt_dev->cur_pkt_size + 64 + extralen + pkt_dev->pkt_overhead;
2708         if (pkt_dev->flags & F_NODE) {
2709                 int node = pkt_dev->node >= 0 ? pkt_dev->node : numa_node_id();
2710 
2711                 skb = __alloc_skb(NET_SKB_PAD + size, GFP_NOWAIT, 0, node);
2712                 if (likely(skb)) {
2713                         skb_reserve(skb, NET_SKB_PAD);
2714                         skb->dev = dev;
2715                 }
2716         } else {
2717                  skb = __netdev_alloc_skb(dev, size, GFP_NOWAIT);
2718         }
2719 
2720         /* the caller pre-fetches from skb->data and reserves for the mac hdr */
2721         if (likely(skb))
2722                 skb_reserve(skb, extralen - 16);
2723 
2724         return skb;
2725 }
2726 
2727 static struct sk_buff *fill_packet_ipv4(struct net_device *odev,
2728                                         struct pktgen_dev *pkt_dev)
2729 {
2730         struct sk_buff *skb = NULL;
2731         __u8 *eth;
2732         struct udphdr *udph;
2733         int datalen, iplen;
2734         struct iphdr *iph;
2735         __be16 protocol = htons(ETH_P_IP);
2736         __be32 *mpls;
2737         __be16 *vlan_tci = NULL;                 /* Encapsulates priority and VLAN ID */
2738         __be16 *vlan_encapsulated_proto = NULL;  /* packet type ID field (or len) for VLAN tag */
2739         __be16 *svlan_tci = NULL;                /* Encapsulates priority and SVLAN ID */
2740         __be16 *svlan_encapsulated_proto = NULL; /* packet type ID field (or len) for SVLAN tag */
2741         u16 queue_map;
2742 
2743         if (pkt_dev->nr_labels)
2744                 protocol = htons(ETH_P_MPLS_UC);
2745 
2746         if (pkt_dev->vlan_id != 0xffff)
2747                 protocol = htons(ETH_P_8021Q);
2748 
2749         /* Update any of the values, used when we're incrementing various
2750          * fields.
2751          */
2752         mod_cur_headers(pkt_dev);
2753         queue_map = pkt_dev->cur_queue_map;
2754 
2755         skb = pktgen_alloc_skb(odev, pkt_dev);
2756         if (!skb) {
2757                 sprintf(pkt_dev->result, "No memory");
2758                 return NULL;
2759         }
2760 
2761         prefetchw(skb->data);
2762         skb_reserve(skb, 16);
2763 
2764         /*  Reserve for ethernet and IP header  */
2765         eth = skb_push(skb, 14);
2766         mpls = skb_put(skb, pkt_dev->nr_labels * sizeof(__u32));
2767         if (pkt_dev->nr_labels)
2768                 mpls_push(mpls, pkt_dev);
2769 
2770         if (pkt_dev->vlan_id != 0xffff) {
2771                 if (pkt_dev->svlan_id != 0xffff) {
2772                         svlan_tci = skb_put(skb, sizeof(__be16));
2773                         *svlan_tci = build_tci(pkt_dev->svlan_id,
2774                                                pkt_dev->svlan_cfi,
2775                                                pkt_dev->svlan_p);
2776                         svlan_encapsulated_proto = skb_put(skb,
2777                                                            sizeof(__be16));
2778                         *svlan_encapsulated_proto = htons(ETH_P_8021Q);
2779                 }
2780                 vlan_tci = skb_put(skb, sizeof(__be16));
2781                 *vlan_tci = build_tci(pkt_dev->vlan_id,
2782                                       pkt_dev->vlan_cfi,
2783                                       pkt_dev->vlan_p);
2784                 vlan_encapsulated_proto = skb_put(skb, sizeof(__be16));
2785                 *vlan_encapsulated_proto = htons(ETH_P_IP);
2786         }
2787 
2788         skb_reset_mac_header(skb);
2789         skb_set_network_header(skb, skb->len);
2790         iph = skb_put(skb, sizeof(struct iphdr));
2791 
2792         skb_set_transport_header(skb, skb->len);
2793         udph = skb_put(skb, sizeof(struct udphdr));
2794         skb_set_queue_mapping(skb, queue_map);
2795         skb->priority = pkt_dev->skb_priority;
2796 
2797         memcpy(eth, pkt_dev->hh, 12);
2798         *(__be16 *) & eth[12] = protocol;
2799 
2800         /* Eth + IPh + UDPh + mpls */
2801         datalen = pkt_dev->cur_pkt_size - 14 - 20 - 8 -
2802                   pkt_dev->pkt_overhead;
2803         if (datalen < 0 || datalen < sizeof(struct pktgen_hdr))
2804                 datalen = sizeof(struct pktgen_hdr);
2805 
2806         udph->source = htons(pkt_dev->cur_udp_src);
2807         udph->dest = htons(pkt_dev->cur_udp_dst);
2808         udph->len = htons(datalen + 8); /* DATA + udphdr */
2809         udph->check = 0;
2810 
2811         iph->ihl = 5;
2812         iph->version = 4;
2813         iph->ttl = 32;
2814         iph->tos = pkt_dev->tos;
2815         iph->protocol = IPPROTO_UDP;    /* UDP */
2816         iph->saddr = pkt_dev->cur_saddr;
2817         iph->daddr = pkt_dev->cur_daddr;
2818         iph->id = htons(pkt_dev->ip_id);
2819         pkt_dev->ip_id++;
2820         iph->frag_off = 0;
2821         iplen = 20 + 8 + datalen;
2822         iph->tot_len = htons(iplen);
2823         ip_send_check(iph);
2824         skb->protocol = protocol;
2825         skb->dev = odev;
2826         skb->pkt_type = PACKET_HOST;
2827 
2828         pktgen_finalize_skb(pkt_dev, skb, datalen);
2829 
2830         if (!(pkt_dev->flags & F_UDPCSUM)) {
2831                 skb->ip_summed = CHECKSUM_NONE;
2832         } else if (odev->features & (NETIF_F_HW_CSUM | NETIF_F_IP_CSUM)) {
2833                 skb->ip_summed = CHECKSUM_PARTIAL;
2834                 skb->csum = 0;
2835                 udp4_hwcsum(skb, iph->saddr, iph->daddr);
2836         } else {
2837                 __wsum csum = skb_checksum(skb, skb_transport_offset(skb), datalen + 8, 0);
2838 
2839                 /* add protocol-dependent pseudo-header */
2840                 udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
2841                                                 datalen + 8, IPPROTO_UDP, csum);
2842 
2843                 if (udph->check == 0)
2844                         udph->check = CSUM_MANGLED_0;
2845         }
2846 
2847 #ifdef CONFIG_XFRM
2848         if (!process_ipsec(pkt_dev, skb, protocol))
2849                 return NULL;
2850 #endif
2851 
2852         return skb;
2853 }
2854 
2855 static struct sk_buff *fill_packet_ipv6(struct net_device *odev,
2856                                         struct pktgen_dev *pkt_dev)
2857 {
2858         struct sk_buff *skb = NULL;
2859         __u8 *eth;
2860         struct udphdr *udph;
2861         int datalen, udplen;
2862         struct ipv6hdr *iph;
2863         __be16 protocol = htons(ETH_P_IPV6);
2864         __be32 *mpls;
2865         __be16 *vlan_tci = NULL;                 /* Encapsulates priority and VLAN ID */
2866         __be16 *vlan_encapsulated_proto = NULL;  /* packet type ID field (or len) for VLAN tag */
2867         __be16 *svlan_tci = NULL;                /* Encapsulates priority and SVLAN ID */
2868         __be16 *svlan_encapsulated_proto = NULL; /* packet type ID field (or len) for SVLAN tag */
2869         u16 queue_map;
2870 
2871         if (pkt_dev->nr_labels)
2872                 protocol = htons(ETH_P_MPLS_UC);
2873 
2874         if (pkt_dev->vlan_id != 0xffff)
2875                 protocol = htons(ETH_P_8021Q);
2876 
2877         /* Update any of the values, used when we're incrementing various
2878          * fields.
2879          */
2880         mod_cur_headers(pkt_dev);
2881         queue_map = pkt_dev->cur_queue_map;
2882 
2883         skb = pktgen_alloc_skb(odev, pkt_dev);
2884         if (!skb) {
2885                 sprintf(pkt_dev->result, "No memory");
2886                 return NULL;
2887         }
2888 
2889         prefetchw(skb->data);
2890         skb_reserve(skb, 16);
2891 
2892         /*  Reserve for ethernet and IP header  */
2893         eth = skb_push(skb, 14);
2894         mpls = skb_put(skb, pkt_dev->nr_labels * sizeof(__u32));
2895         if (pkt_dev->nr_labels)
2896                 mpls_push(mpls, pkt_dev);
2897 
2898         if (pkt_dev->vlan_id != 0xffff) {
2899                 if (pkt_dev->svlan_id != 0xffff) {
2900                         svlan_tci = skb_put(skb, sizeof(__be16));
2901                         *svlan_tci = build_tci(pkt_dev->svlan_id,
2902                                                pkt_dev->svlan_cfi,
2903                                                pkt_dev->svlan_p);
2904                         svlan_encapsulated_proto = skb_put(skb,
2905                                                            sizeof(__be16));
2906                         *svlan_encapsulated_proto = htons(ETH_P_8021Q);
2907                 }
2908                 vlan_tci = skb_put(skb, sizeof(__be16));
2909                 *vlan_tci = build_tci(pkt_dev->vlan_id,
2910                                       pkt_dev->vlan_cfi,
2911                                       pkt_dev->vlan_p);
2912                 vlan_encapsulated_proto = skb_put(skb, sizeof(__be16));
2913                 *vlan_encapsulated_proto = htons(ETH_P_IPV6);
2914         }
2915 
2916         skb_reset_mac_header(skb);
2917         skb_set_network_header(skb, skb->len);
2918         iph = skb_put(skb, sizeof(struct ipv6hdr));
2919 
2920         skb_set_transport_header(skb, skb->len);
2921         udph = skb_put(skb, sizeof(struct udphdr));
2922         skb_set_queue_mapping(skb, queue_map);
2923         skb->priority = pkt_dev->skb_priority;
2924 
2925         memcpy(eth, pkt_dev->hh, 12);
2926         *(__be16 *) &eth[12] = protocol;
2927 
2928         /* Eth + IPh + UDPh + mpls */
2929         datalen = pkt_dev->cur_pkt_size - 14 -
2930                   sizeof(struct ipv6hdr) - sizeof(struct udphdr) -
2931                   pkt_dev->pkt_overhead;
2932 
2933         if (datalen < 0 || datalen < sizeof(struct pktgen_hdr)) {
2934                 datalen = sizeof(struct pktgen_hdr);
2935                 net_info_ratelimited("increased datalen to %d\n", datalen);
2936         }
2937 
2938         udplen = datalen + sizeof(struct udphdr);
2939         udph->source = htons(pkt_dev->cur_udp_src);
2940         udph->dest = htons(pkt_dev->cur_udp_dst);
2941         udph->len = htons(udplen);
2942         udph->check = 0;
2943 
2944         *(__be32 *) iph = htonl(0x60000000);    /* Version + flow */
2945 
2946         if (pkt_dev->traffic_class) {
2947                 /* Version + traffic class + flow (0) */
2948                 *(__be32 *)iph |= htonl(0x60000000 | (pkt_dev->traffic_class << 20));
2949         }
2950 
2951         iph->hop_limit = 32;
2952 
2953         iph->payload_len = htons(udplen);
2954         iph->nexthdr = IPPROTO_UDP;
2955 
2956         iph->daddr = pkt_dev->cur_in6_daddr;
2957         iph->saddr = pkt_dev->cur_in6_saddr;
2958 
2959         skb->protocol = protocol;
2960         skb->dev = odev;
2961         skb->pkt_type = PACKET_HOST;
2962 
2963         pktgen_finalize_skb(pkt_dev, skb, datalen);
2964 
2965         if (!(pkt_dev->flags & F_UDPCSUM)) {
2966                 skb->ip_summed = CHECKSUM_NONE;
2967         } else if (odev->features & (NETIF_F_HW_CSUM | NETIF_F_IPV6_CSUM)) {
2968                 skb->ip_summed = CHECKSUM_PARTIAL;
2969                 skb->csum_start = skb_transport_header(skb) - skb->head;
2970                 skb->csum_offset = offsetof(struct udphdr, check);
2971                 udph->check = ~csum_ipv6_magic(&iph->saddr, &iph->daddr, udplen, IPPROTO_UDP, 0);
2972         } else {
2973                 __wsum csum = skb_checksum(skb, skb_transport_offset(skb), udplen, 0);
2974 
2975                 /* add protocol-dependent pseudo-header */
2976                 udph->check = csum_ipv6_magic(&iph->saddr, &iph->daddr, udplen, IPPROTO_UDP, csum);
2977 
2978                 if (udph->check == 0)
2979                         udph->check = CSUM_MANGLED_0;
2980         }
2981 
2982         return skb;
2983 }
2984 
2985 static struct sk_buff *fill_packet(struct net_device *odev,
2986                                    struct pktgen_dev *pkt_dev)
2987 {
2988         if (pkt_dev->flags & F_IPV6)
2989                 return fill_packet_ipv6(odev, pkt_dev);
2990         else
2991                 return fill_packet_ipv4(odev, pkt_dev);
2992 }
2993 
2994 static void pktgen_clear_counters(struct pktgen_dev *pkt_dev)
2995 {
2996         pkt_dev->seq_num = 1;
2997         pkt_dev->idle_acc = 0;
2998         pkt_dev->sofar = 0;
2999         pkt_dev->tx_bytes = 0;
3000         pkt_dev->errors = 0;
3001 }
3002 
3003 /* Set up structure for sending pkts, clear counters */
3004 
3005 static void pktgen_run(struct pktgen_thread *t)
3006 {
3007         struct pktgen_dev *pkt_dev;
3008         int started = 0;
3009 
3010         func_enter();
3011 
3012         rcu_read_lock();
3013         list_for_each_entry_rcu(pkt_dev, &t->if_list, list) {
3014 
3015                 /*
3016                  * setup odev and create initial packet.
3017                  */
3018                 pktgen_setup_inject(pkt_dev);
3019 
3020                 if (pkt_dev->odev) {
3021                         pktgen_clear_counters(pkt_dev);
3022                         pkt_dev->skb = NULL;
3023                         pkt_dev->started_at = pkt_dev->next_tx = ktime_get();
3024 
3025                         set_pkt_overhead(pkt_dev);
3026 
3027                         strcpy(pkt_dev->result, "Starting");
3028                         pkt_dev->running = 1;   /* Cranke yeself! */
3029                         started++;
3030                 } else
3031                         strcpy(pkt_dev->result, "Error starting");
3032         }
3033         rcu_read_unlock();
3034         if (started)
3035                 t->control &= ~(T_STOP);
3036 }
3037 
3038 static void pktgen_stop_all_threads_ifs(struct pktgen_net *pn)
3039 {
3040         struct pktgen_thread *t;
3041 
3042         func_enter();
3043 
3044         mutex_lock(&pktgen_thread_lock);
3045 
3046         list_for_each_entry(t, &pn->pktgen_threads, th_list)
3047                 t->control |= T_STOP;
3048 
3049         mutex_unlock(&pktgen_thread_lock);
3050 }
3051 
3052 static int thread_is_running(const struct pktgen_thread *t)
3053 {
3054         const struct pktgen_dev *pkt_dev;
3055 
3056         rcu_read_lock();
3057         list_for_each_entry_rcu(pkt_dev, &t->if_list, list)
3058                 if (pkt_dev->running) {
3059                         rcu_read_unlock();
3060                         return 1;
3061                 }
3062         rcu_read_unlock();
3063         return 0;
3064 }
3065 
3066 static int pktgen_wait_thread_run(struct pktgen_thread *t)
3067 {
3068         while (thread_is_running(t)) {
3069 
3070                 msleep_interruptible(100);
3071 
3072                 if (signal_pending(current))
3073                         goto signal;
3074         }
3075         return 1;
3076 signal:
3077         return 0;
3078 }
3079 
3080 static int pktgen_wait_all_threads_run(struct pktgen_net *pn)
3081 {
3082         struct pktgen_thread *t;
3083         int sig = 1;
3084 
3085         mutex_lock(&pktgen_thread_lock);
3086 
3087         list_for_each_entry(t, &pn->pktgen_threads, th_list) {
3088                 sig = pktgen_wait_thread_run(t);
3089                 if (sig == 0)
3090                         break;
3091         }
3092 
3093         if (sig == 0)
3094                 list_for_each_entry(t, &pn->pktgen_threads, th_list)
3095                         t->control |= (T_STOP);
3096 
3097         mutex_unlock(&pktgen_thread_lock);
3098         return sig;
3099 }
3100 
3101 static void pktgen_run_all_threads(struct pktgen_net *pn)
3102 {
3103         struct pktgen_thread *t;
3104 
3105         func_enter();
3106 
3107         mutex_lock(&pktgen_thread_lock);
3108 
3109         list_for_each_entry(t, &pn->pktgen_threads, th_list)
3110                 t->control |= (T_RUN);
3111 
3112         mutex_unlock(&pktgen_thread_lock);
3113 
3114         /* Propagate thread->control  */
3115         schedule_timeout_interruptible(msecs_to_jiffies(125));
3116 
3117         pktgen_wait_all_threads_run(pn);
3118 }
3119 
3120 static void pktgen_reset_all_threads(struct pktgen_net *pn)
3121 {
3122         struct pktgen_thread *t;
3123 
3124         func_enter();
3125 
3126         mutex_lock(&pktgen_thread_lock);
3127 
3128         list_for_each_entry(t, &pn->pktgen_threads, th_list)
3129                 t->control |= (T_REMDEVALL);
3130 
3131         mutex_unlock(&pktgen_thread_lock);
3132 
3133         /* Propagate thread->control  */
3134         schedule_timeout_interruptible(msecs_to_jiffies(125));
3135 
3136         pktgen_wait_all_threads_run(pn);
3137 }
3138 
3139 static void show_results(struct pktgen_dev *pkt_dev, int nr_frags)
3140 {
3141         __u64 bps, mbps, pps;
3142         char *p = pkt_dev->result;
3143         ktime_t elapsed = ktime_sub(pkt_dev->stopped_at,
3144                                     pkt_dev->started_at);
3145         ktime_t idle = ns_to_ktime(pkt_dev->idle_acc);
3146 
3147         p += sprintf(p, "OK: %llu(c%llu+d%llu) usec, %llu (%dbyte,%dfrags)\n",
3148                      (unsigned long long)ktime_to_us(elapsed),
3149                      (unsigned long long)ktime_to_us(ktime_sub(elapsed, idle)),
3150                      (unsigned long long)ktime_to_us(idle),
3151                      (unsigned long long)pkt_dev->sofar,
3152                      pkt_dev->cur_pkt_size, nr_frags);
3153 
3154         pps = div64_u64(pkt_dev->sofar * NSEC_PER_SEC,
3155                         ktime_to_ns(elapsed));
3156 
3157         bps = pps * 8 * pkt_dev->cur_pkt_size;
3158 
3159         mbps = bps;
3160         do_div(mbps, 1000000);
3161         p += sprintf(p, "  %llupps %lluMb/sec (%llubps) errors: %llu",
3162                      (unsigned long long)pps,
3163                      (unsigned long long)mbps,
3164                      (unsigned long long)bps,
3165                      (unsigned long long)pkt_dev->errors);
3166 }
3167 
3168 /* Set stopped-at timer, remove from running list, do counters & statistics */
3169 static int pktgen_stop_device(struct pktgen_dev *pkt_dev)
3170 {
3171         int nr_frags = pkt_dev->skb ? skb_shinfo(pkt_dev->skb)->nr_frags : -1;
3172 
3173         if (!pkt_dev->running) {
3174                 pr_warn("interface: %s is already stopped\n",
3175                         pkt_dev->odevname);
3176                 return -EINVAL;
3177         }
3178 
3179         pkt_dev->running = 0;
3180         kfree_skb(pkt_dev->skb);
3181         pkt_dev->skb = NULL;
3182         pkt_dev->stopped_at = ktime_get();
3183 
3184         show_results(pkt_dev, nr_frags);
3185 
3186         return 0;
3187 }
3188 
3189 static struct pktgen_dev *next_to_run(struct pktgen_thread *t)
3190 {
3191         struct pktgen_dev *pkt_dev, *best = NULL;
3192 
3193         rcu_read_lock();
3194         list_for_each_entry_rcu(pkt_dev, &t->if_list, list) {
3195                 if (!pkt_dev->running)
3196                         continue;
3197                 if (best == NULL)
3198                         best = pkt_dev;
3199                 else if (ktime_compare(pkt_dev->next_tx, best->next_tx) < 0)
3200                         best = pkt_dev;
3201         }
3202         rcu_read_unlock();
3203 
3204         return best;
3205 }
3206 
3207 static void pktgen_stop(struct pktgen_thread *t)
3208 {
3209         struct pktgen_dev *pkt_dev;
3210 
3211         func_enter();
3212 
3213         rcu_read_lock();
3214 
3215         list_for_each_entry_rcu(pkt_dev, &t->if_list, list) {
3216                 pktgen_stop_device(pkt_dev);
3217         }
3218 
3219         rcu_read_unlock();
3220 }
3221 
3222 /*
3223  * one of our devices needs to be removed - find it
3224  * and remove it
3225  */
3226 static void pktgen_rem_one_if(struct pktgen_thread *t)
3227 {
3228         struct list_head *q, *n;
3229         struct pktgen_dev *cur;
3230 
3231         func_enter();
3232 
3233         list_for_each_safe(q, n, &t->if_list) {
3234                 cur = list_entry(q, struct pktgen_dev, list);
3235 
3236                 if (!cur->removal_mark)
3237                         continue;
3238 
3239                 kfree_skb(cur->skb);
3240                 cur->skb = NULL;
3241 
3242                 pktgen_remove_device(t, cur);
3243 
3244                 break;
3245         }
3246 }
3247 
3248 static void pktgen_rem_all_ifs(struct pktgen_thread *t)
3249 {
3250         struct list_head *q, *n;
3251         struct pktgen_dev *cur;
3252 
3253         func_enter();
3254 
3255         /* Remove all devices, free mem */
3256 
3257         list_for_each_safe(q, n, &t->if_list) {
3258                 cur = list_entry(q, struct pktgen_dev, list);
3259 
3260                 kfree_skb(cur->skb);
3261                 cur->skb = NULL;
3262 
3263                 pktgen_remove_device(t, cur);
3264         }
3265 }
3266 
3267 static void pktgen_rem_thread(struct pktgen_thread *t)
3268 {
3269         /* Remove from the thread list */
3270         remove_proc_entry(t->tsk->comm, t->net->proc_dir);
3271 }
3272 
3273 static void pktgen_resched(struct pktgen_dev *pkt_dev)
3274 {
3275         ktime_t idle_start = ktime_get();
3276         schedule();
3277         pkt_dev->idle_acc += ktime_to_ns(ktime_sub(ktime_get(), idle_start));
3278 }
3279 
3280 static void pktgen_wait_for_skb(struct pktgen_dev *pkt_dev)
3281 {
3282         ktime_t idle_start = ktime_get();
3283 
3284         while (refcount_read(&(pkt_dev->skb->users)) != 1) {
3285                 if (signal_pending(current))
3286                         break;
3287 
3288                 if (need_resched())
3289                         pktgen_resched(pkt_dev);
3290                 else
3291                         cpu_relax();
3292         }
3293         pkt_dev->idle_acc += ktime_to_ns(ktime_sub(ktime_get(), idle_start));
3294 }
3295 
3296 static void pktgen_xmit(struct pktgen_dev *pkt_dev)
3297 {
3298         unsigned int burst = READ_ONCE(pkt_dev->burst);
3299         struct net_device *odev = pkt_dev->odev;
3300         struct netdev_queue *txq;
3301         struct sk_buff *skb;
3302         int ret;
3303 
3304         /* If device is offline, then don't send */
3305         if (unlikely(!netif_running(odev) || !netif_carrier_ok(odev))) {
3306                 pktgen_stop_device(pkt_dev);
3307                 return;
3308         }
3309 
3310         /* This is max DELAY, this has special meaning of
3311          * "never transmit"
3312          */
3313         if (unlikely(pkt_dev->delay == ULLONG_MAX)) {
3314                 pkt_dev->next_tx = ktime_add_ns(ktime_get(), ULONG_MAX);
3315                 return;
3316         }
3317 
3318         /* If no skb or clone count exhausted then get new one */
3319         if (!pkt_dev->skb || (pkt_dev->last_ok &&
3320                               ++pkt_dev->clone_count >= pkt_dev->clone_skb)) {
3321                 /* build a new pkt */
3322                 kfree_skb(pkt_dev->skb);
3323 
3324                 pkt_dev->skb = fill_packet(odev, pkt_dev);
3325                 if (pkt_dev->skb == NULL) {
3326                         pr_err("ERROR: couldn't allocate skb in fill_packet\n");
3327                         schedule();
3328                         pkt_dev->clone_count--; /* back out increment, OOM */
3329                         return;
3330                 }
3331                 pkt_dev->last_pkt_size = pkt_dev->skb->len;
3332                 pkt_dev->clone_count = 0;       /* reset counter */
3333         }
3334 
3335         if (pkt_dev->delay && pkt_dev->last_ok)
3336                 spin(pkt_dev, pkt_dev->next_tx);
3337 
3338         if (pkt_dev->xmit_mode == M_NETIF_RECEIVE) {
3339                 skb = pkt_dev->skb;
3340                 skb->protocol = eth_type_trans(skb, skb->dev);
3341                 refcount_add(burst, &skb->users);
3342                 local_bh_disable();
3343                 do {
3344                         ret = netif_receive_skb(skb);
3345                         if (ret == NET_RX_DROP)
3346                                 pkt_dev->errors++;
3347                         pkt_dev->sofar++;
3348                         pkt_dev->seq_num++;
3349                         if (refcount_read(&skb->users) != burst) {
3350                                 /* skb was queued by rps/rfs or taps,
3351                                  * so cannot reuse this skb
3352                                  */
3353                                 WARN_ON(refcount_sub_and_test(burst - 1, &skb->users));
3354                                 /* get out of the loop and wait
3355                                  * until skb is consumed
3356                                  */
3357                                 break;
3358                         }
3359                         /* skb was 'freed' by stack, so clean few
3360                          * bits and reuse it
3361                          */
3362                         skb_reset_tc(skb);
3363                 } while (--burst > 0);
3364                 goto out; /* Skips xmit_mode M_START_XMIT */
3365         } else if (pkt_dev->xmit_mode == M_QUEUE_XMIT) {
3366                 local_bh_disable();
3367                 refcount_inc(&pkt_dev->skb->users);
3368 
3369                 ret = dev_queue_xmit(pkt_dev->skb);
3370                 switch (ret) {
3371                 case NET_XMIT_SUCCESS:
3372                         pkt_dev->sofar++;
3373                         pkt_dev->seq_num++;
3374                         pkt_dev->tx_bytes += pkt_dev->last_pkt_size;
3375                         break;
3376                 case NET_XMIT_DROP:
3377                 case NET_XMIT_CN:
3378                 /* These are all valid return codes for a qdisc but
3379                  * indicate packets are being dropped or will likely
3380                  * be dropped soon.
3381                  */
3382                 case NETDEV_TX_BUSY:
3383                 /* qdisc may call dev_hard_start_xmit directly in cases
3384                  * where no queues exist e.g. loopback device, virtual
3385                  * devices, etc. In this case we need to handle
3386                  * NETDEV_TX_ codes.
3387                  */
3388                 default:
3389                         pkt_dev->errors++;
3390                         net_info_ratelimited("%s xmit error: %d\n",
3391                                              pkt_dev->odevname, ret);
3392                         break;
3393                 }
3394                 goto out;
3395         }
3396 
3397         txq = skb_get_tx_queue(odev, pkt_dev->skb);
3398 
3399         local_bh_disable();
3400 
3401         HARD_TX_LOCK(odev, txq, smp_processor_id());
3402 
3403         if (unlikely(netif_xmit_frozen_or_drv_stopped(txq))) {
3404                 ret = NETDEV_TX_BUSY;
3405                 pkt_dev->last_ok = 0;
3406                 goto unlock;
3407         }
3408         refcount_add(burst, &pkt_dev->skb->users);
3409 
3410 xmit_more:
3411         ret = netdev_start_xmit(pkt_dev->skb, odev, txq, --burst > 0);
3412 
3413         switch (ret) {
3414         case NETDEV_TX_OK:
3415                 pkt_dev->last_ok = 1;
3416                 pkt_dev->sofar++;
3417                 pkt_dev->seq_num++;
3418                 pkt_dev->tx_bytes += pkt_dev->last_pkt_size;
3419                 if (burst > 0 && !netif_xmit_frozen_or_drv_stopped(txq))
3420                         goto xmit_more;
3421                 break;
3422         case NET_XMIT_DROP:
3423         case NET_XMIT_CN:
3424                 /* skb has been consumed */
3425                 pkt_dev->errors++;
3426                 break;
3427         default: /* Drivers are not supposed to return other values! */
3428                 net_info_ratelimited("%s xmit error: %d\n",
3429                                      pkt_dev->odevname, ret);
3430                 pkt_dev->errors++;
3431                 /* fallthru */
3432         case NETDEV_TX_BUSY:
3433                 /* Retry it next time */
3434                 refcount_dec(&(pkt_dev->skb->users));
3435                 pkt_dev->last_ok = 0;
3436         }
3437         if (unlikely(burst))
3438                 WARN_ON(refcount_sub_and_test(burst, &pkt_dev->skb->users));
3439 unlock:
3440         HARD_TX_UNLOCK(odev, txq);
3441 
3442 out:
3443         local_bh_enable();
3444 
3445         /* If pkt_dev->count is zero, then run forever */
3446         if ((pkt_dev->count != 0) && (pkt_dev->sofar >= pkt_dev->count)) {
3447                 pktgen_wait_for_skb(pkt_dev);
3448 
3449                 /* Done with this */
3450                 pktgen_stop_device(pkt_dev);
3451         }
3452 }
3453 
3454 /*
3455  * Main loop of the thread goes here
3456  */
3457 
3458 static int pktgen_thread_worker(void *arg)
3459 {
3460         DEFINE_WAIT(wait);
3461         struct pktgen_thread *t = arg;
3462         struct pktgen_dev *pkt_dev = NULL;
3463         int cpu = t->cpu;
3464 
3465         BUG_ON(smp_processor_id() != cpu);
3466 
3467         init_waitqueue_head(&t->queue);
3468         complete(&t->start_done);
3469 
3470         pr_debug("starting pktgen/%d:  pid=%d\n", cpu, task_pid_nr(current));
3471 
3472         set_freezable();
3473 
3474         while (!kthread_should_stop()) {
3475                 pkt_dev = next_to_run(t);
3476 
3477                 if (unlikely(!pkt_dev && t->control == 0)) {
3478                         if (t->net->pktgen_exiting)
3479                                 break;
3480                         wait_event_interruptible_timeout(t->queue,
3481                                                          t->control != 0,
3482                                                          HZ/10);
3483                         try_to_freeze();
3484                         continue;
3485                 }
3486 
3487                 if (likely(pkt_dev)) {
3488                         pktgen_xmit(pkt_dev);
3489 
3490                         if (need_resched())
3491                                 pktgen_resched(pkt_dev);
3492                         else
3493                                 cpu_relax();
3494                 }
3495 
3496                 if (t->control & T_STOP) {
3497                         pktgen_stop(t);
3498                         t->control &= ~(T_STOP);
3499                 }
3500 
3501                 if (t->control & T_RUN) {
3502                         pktgen_run(t);
3503                         t->control &= ~(T_RUN);
3504                 }
3505 
3506                 if (t->control & T_REMDEVALL) {
3507                         pktgen_rem_all_ifs(t);
3508                         t->control &= ~(T_REMDEVALL);
3509                 }
3510 
3511                 if (t->control & T_REMDEV) {
3512                         pktgen_rem_one_if(t);
3513                         t->control &= ~(T_REMDEV);
3514                 }
3515 
3516                 try_to_freeze();
3517         }
3518 
3519         pr_debug("%s stopping all device\n", t->tsk->comm);
3520         pktgen_stop(t);
3521 
3522         pr_debug("%s removing all device\n", t->tsk->comm);
3523         pktgen_rem_all_ifs(t);
3524 
3525         pr_debug("%s removing thread\n", t->tsk->comm);
3526         pktgen_rem_thread(t);
3527 
3528         return 0;
3529 }
3530 
3531 static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t,
3532                                           const char *ifname, bool exact)
3533 {
3534         struct pktgen_dev *p, *pkt_dev = NULL;
3535         size_t len = strlen(ifname);
3536 
3537         rcu_read_lock();
3538         list_for_each_entry_rcu(p, &t->if_list, list)
3539                 if (strncmp(p->odevname, ifname, len) == 0) {
3540                         if (p->odevname[len]) {
3541                                 if (exact || p->odevname[len] != '@')
3542                                         continue;
3543                         }
3544                         pkt_dev = p;
3545                         break;
3546                 }
3547 
3548         rcu_read_unlock();
3549         pr_debug("find_dev(%s) returning %p\n", ifname, pkt_dev);
3550         return pkt_dev;
3551 }
3552 
3553 /*
3554  * Adds a dev at front of if_list.
3555  */
3556 
3557 static int add_dev_to_thread(struct pktgen_thread *t,
3558                              struct pktgen_dev *pkt_dev)
3559 {
3560         int rv = 0;
3561 
3562         /* This function cannot be called concurrently, as its called
3563          * under pktgen_thread_lock mutex, but it can run from
3564          * userspace on another CPU than the kthread.  The if_lock()
3565          * is used here to sync with concurrent instances of
3566          * _rem_dev_from_if_list() invoked via kthread, which is also
3567          * updating the if_list */
3568         if_lock(t);
3569 
3570         if (pkt_dev->pg_thread) {
3571                 pr_err("ERROR: already assigned to a thread\n");
3572                 rv = -EBUSY;
3573                 goto out;
3574         }
3575 
3576         pkt_dev->running = 0;
3577         pkt_dev->pg_thread = t;
3578         list_add_rcu(&pkt_dev->list, &t->if_list);
3579 
3580 out:
3581         if_unlock(t);
3582         return rv;
3583 }
3584 
3585 /* Called under thread lock */
3586 
3587 static int pktgen_add_device(struct pktgen_thread *t, const char *ifname)
3588 {
3589         struct pktgen_dev *pkt_dev;
3590         int err;
3591         int node = cpu_to_node(t->cpu);
3592 
3593         /* We don't allow a device to be on several threads */
3594 
3595         pkt_dev = __pktgen_NN_threads(t->net, ifname, FIND);
3596         if (pkt_dev) {
3597                 pr_err("ERROR: interface already used\n");
3598                 return -EBUSY;
3599         }
3600 
3601         pkt_dev = kzalloc_node(sizeof(struct pktgen_dev), GFP_KERNEL, node);
3602         if (!pkt_dev)
3603                 return -ENOMEM;
3604 
3605         strcpy(pkt_dev->odevname, ifname);
3606         pkt_dev->flows = vzalloc_node(MAX_CFLOWS * sizeof(struct flow_state),
3607                                       node);
3608         if (pkt_dev->flows == NULL) {
3609                 kfree(pkt_dev);
3610                 return -ENOMEM;
3611         }
3612 
3613         pkt_dev->removal_mark = 0;
3614         pkt_dev->nfrags = 0;
3615         pkt_dev->delay = pg_delay_d;
3616         pkt_dev->count = pg_count_d;
3617         pkt_dev->sofar = 0;
3618         pkt_dev->udp_src_min = 9;       /* sink port */
3619         pkt_dev->udp_src_max = 9;
3620         pkt_dev->udp_dst_min = 9;
3621         pkt_dev->udp_dst_max = 9;
3622         pkt_dev->vlan_p = 0;
3623         pkt_dev->vlan_cfi = 0;
3624         pkt_dev->vlan_id = 0xffff;
3625         pkt_dev->svlan_p = 0;
3626         pkt_dev->svlan_cfi = 0;
3627         pkt_dev->svlan_id = 0xffff;
3628         pkt_dev->burst = 1;
3629         pkt_dev->node = -1;
3630 
3631         err = pktgen_setup_dev(t->net, pkt_dev, ifname);
3632         if (err)
3633                 goto out1;
3634         if (pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING)
3635                 pkt_dev->clone_skb = pg_clone_skb_d;
3636 
3637         pkt_dev->entry = proc_create_data(ifname, 0600, t->net->proc_dir,
3638                                           &pktgen_if_fops, pkt_dev);
3639         if (!pkt_dev->entry) {
3640                 pr_err("cannot create %s/%s procfs entry\n",
3641                        PG_PROC_DIR, ifname);
3642                 err = -EINVAL;
3643                 goto out2;
3644         }
3645 #ifdef CONFIG_XFRM
3646         pkt_dev->ipsmode = XFRM_MODE_TRANSPORT;
3647         pkt_dev->ipsproto = IPPROTO_ESP;
3648 
3649         /* xfrm tunnel mode needs additional dst to extract outter
3650          * ip header protocol/ttl/id field, here creat a phony one.
3651          * instead of looking for a valid rt, which definitely hurting
3652          * performance under such circumstance.
3653          */
3654         pkt_dev->dstops.family = AF_INET;
3655         pkt_dev->xdst.u.dst.dev = pkt_dev->odev;
3656         dst_init_metrics(&pkt_dev->xdst.u.dst, pktgen_dst_metrics, false);
3657         pkt_dev->xdst.child = &pkt_dev->xdst.u.dst;
3658         pkt_dev->xdst.u.dst.ops = &pkt_dev->dstops;
3659 #endif
3660 
3661         return add_dev_to_thread(t, pkt_dev);
3662 out2:
3663         dev_put(pkt_dev->odev);
3664 out1:
3665 #ifdef CONFIG_XFRM
3666         free_SAs(pkt_dev);
3667 #endif
3668         vfree(pkt_dev->flows);
3669         kfree(pkt_dev);
3670         return err;
3671 }
3672 
3673 static int __net_init pktgen_create_thread(int cpu, struct pktgen_net *pn)
3674 {
3675         struct pktgen_thread *t;
3676         struct proc_dir_entry *pe;
3677         struct task_struct *p;
3678 
3679         t = kzalloc_node(sizeof(struct pktgen_thread), GFP_KERNEL,
3680                          cpu_to_node(cpu));
3681         if (!t) {
3682                 pr_err("ERROR: out of memory, can't create new thread\n");
3683                 return -ENOMEM;
3684         }
3685 
3686         mutex_init(&t->if_lock);
3687         t->cpu = cpu;
3688 
3689         INIT_LIST_HEAD(&t->if_list);
3690 
3691         list_add_tail(&t->th_list, &pn->pktgen_threads);
3692         init_completion(&t->start_done);
3693 
3694         p = kthread_create_on_node(pktgen_thread_worker,
3695                                    t,
3696                                    cpu_to_node(cpu),
3697                                    "kpktgend_%d", cpu);
3698         if (IS_ERR(p)) {
3699                 pr_err("kernel_thread() failed for cpu %d\n", t->cpu);
3700                 list_del(&t->th_list);
3701                 kfree(t);
3702                 return PTR_ERR(p);
3703         }
3704         kthread_bind(p, cpu);
3705         t->tsk = p;
3706 
3707         pe = proc_create_data(t->tsk->comm, 0600, pn->proc_dir,
3708                               &pktgen_thread_fops, t);
3709         if (!pe) {
3710                 pr_err("cannot create %s/%s procfs entry\n",
3711                        PG_PROC_DIR, t->tsk->comm);
3712                 kthread_stop(p);
3713                 list_del(&t->th_list);
3714                 kfree(t);
3715                 return -EINVAL;
3716         }
3717 
3718         t->net = pn;
3719         get_task_struct(p);
3720         wake_up_process(p);
3721         wait_for_completion(&t->start_done);
3722 
3723         return 0;
3724 }
3725 
3726 /*
3727  * Removes a device from the thread if_list.
3728  */
3729 static void _rem_dev_from_if_list(struct pktgen_thread *t,
3730                                   struct pktgen_dev *pkt_dev)
3731 {
3732         struct list_head *q, *n;
3733         struct pktgen_dev *p;
3734 
3735         if_lock(t);
3736         list_for_each_safe(q, n, &t->if_list) {
3737                 p = list_entry(q, struct pktgen_dev, list);
3738                 if (p == pkt_dev)
3739                         list_del_rcu(&p->list);
3740         }
3741         if_unlock(t);
3742 }
3743 
3744 static int pktgen_remove_device(struct pktgen_thread *t,
3745                                 struct pktgen_dev *pkt_dev)
3746 {
3747         pr_debug("remove_device pkt_dev=%p\n", pkt_dev);
3748 
3749         if (pkt_dev->running) {
3750                 pr_warn("WARNING: trying to remove a running interface, stopping it now\n");
3751                 pktgen_stop_device(pkt_dev);
3752         }
3753 
3754         /* Dis-associate from the interface */
3755 
3756         if (pkt_dev->odev) {
3757                 dev_put(pkt_dev->odev);
3758                 pkt_dev->odev = NULL;
3759         }
3760 
3761         /* Remove proc before if_list entry, because add_device uses
3762          * list to determine if interface already exist, avoid race
3763          * with proc_create_data() */
3764         proc_remove(pkt_dev->entry);
3765 
3766         /* And update the thread if_list */
3767         _rem_dev_from_if_list(t, pkt_dev);
3768 
3769 #ifdef CONFIG_XFRM
3770         free_SAs(pkt_dev);
3771 #endif
3772         vfree(pkt_dev->flows);
3773         if (pkt_dev->page)
3774                 put_page(pkt_dev->page);
3775         kfree_rcu(pkt_dev, rcu);
3776         return 0;
3777 }
3778 
3779 static int __net_init pg_net_init(struct net *net)
3780 {
3781         struct pktgen_net *pn = net_generic(net, pg_net_id);
3782         struct proc_dir_entry *pe;
3783         int cpu, ret = 0;
3784 
3785         pn->net = net;
3786         INIT_LIST_HEAD(&pn->pktgen_threads);
3787         pn->pktgen_exiting = false;
3788         pn->proc_dir = proc_mkdir(PG_PROC_DIR, pn->net->proc_net);
3789         if (!pn->proc_dir) {
3790                 pr_warn("cannot create /proc/net/%s\n", PG_PROC_DIR);
3791                 return -ENODEV;
3792         }
3793         pe = proc_create(PGCTRL, 0600, pn->proc_dir, &pktgen_fops);
3794         if (pe == NULL) {
3795                 pr_err("cannot create %s procfs entry\n", PGCTRL);
3796                 ret = -EINVAL;
3797                 goto remove;
3798         }
3799 
3800         for_each_online_cpu(cpu) {
3801                 int err;
3802 
3803                 err = pktgen_create_thread(cpu, pn);
3804                 if (err)
3805                         pr_warn("Cannot create thread for cpu %d (%d)\n",
3806                                    cpu, err);
3807         }
3808 
3809         if (list_empty(&pn->pktgen_threads)) {
3810                 pr_err("Initialization failed for all threads\n");
3811                 ret = -ENODEV;
3812                 goto remove_entry;
3813         }
3814 
3815         return 0;
3816 
3817 remove_entry:
3818         remove_proc_entry(PGCTRL, pn->proc_dir);
3819 remove:
3820         remove_proc_entry(PG_PROC_DIR, pn->net->proc_net);
3821         return ret;
3822 }
3823 
3824 static void __net_exit pg_net_exit(struct net *net)
3825 {
3826         struct pktgen_net *pn = net_generic(net, pg_net_id);
3827         struct pktgen_thread *t;
3828         struct list_head *q, *n;
3829         LIST_HEAD(list);
3830 
3831         /* Stop all interfaces & threads */
3832         pn->pktgen_exiting = true;
3833 
3834         mutex_lock(&pktgen_thread_lock);
3835         list_splice_init(&pn->pktgen_threads, &list);
3836         mutex_unlock(&pktgen_thread_lock);
3837 
3838         list_for_each_safe(q, n, &list) {
3839                 t = list_entry(q, struct pktgen_thread, th_list);
3840                 list_del(&t->th_list);
3841                 kthread_stop(t->tsk);
3842                 put_task_struct(t->tsk);
3843                 kfree(t);
3844         }
3845 
3846         remove_proc_entry(PGCTRL, pn->proc_dir);
3847         remove_proc_entry(PG_PROC_DIR, pn->net->proc_net);
3848 }
3849 
3850 static struct pernet_operations pg_net_ops = {
3851         .init = pg_net_init,
3852         .exit = pg_net_exit,
3853         .id   = &pg_net_id,
3854         .size = sizeof(struct pktgen_net),
3855 };
3856 
3857 static int __init pg_init(void)
3858 {
3859         int ret = 0;
3860 
3861         pr_info("%s", version);
3862         ret = register_pernet_subsys(&pg_net_ops);
3863         if (ret)
3864                 return ret;
3865         ret = register_netdevice_notifier(&pktgen_notifier_block);
3866         if (ret)
3867                 unregister_pernet_subsys(&pg_net_ops);
3868 
3869         return ret;
3870 }
3871 
3872 static void __exit pg_cleanup(void)
3873 {
3874         unregister_netdevice_notifier(&pktgen_notifier_block);
3875         unregister_pernet_subsys(&pg_net_ops);
3876         /* Don't need rcu_barrier() due to use of kfree_rcu() */
3877 }
3878 
3879 module_init(pg_init);
3880 module_exit(pg_cleanup);
3881 
3882 MODULE_AUTHOR("Robert Olsson <robert.olsson@its.uu.se>");
3883 MODULE_DESCRIPTION("Packet Generator tool");
3884 MODULE_LICENSE("GPL");
3885 MODULE_VERSION(VERSION);
3886 module_param(pg_count_d, int, 0);
3887 MODULE_PARM_DESC(pg_count_d, "Default number of packets to inject");
3888 module_param(pg_delay_d, int, 0);
3889 MODULE_PARM_DESC(pg_delay_d, "Default delay between packets (nanoseconds)");
3890 module_param(pg_clone_skb_d, int, 0);
3891 MODULE_PARM_DESC(pg_clone_skb_d, "Default number of copies of the same packet");
3892 module_param(debug, int, 0);
3893 MODULE_PARM_DESC(debug, "Enable debugging of pktgen module");
3894 

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