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 <linux/mmzone.h> 162 #include <net/net_namespace.h> 163 #include <net/checksum.h> 164 #include <net/ipv6.h> 165 #include <net/udp.h> 166 #include <net/ip6_checksum.h> 167 #include <net/addrconf.h> 168 #ifdef CONFIG_XFRM 169 #include <net/xfrm.h> 170 #endif 171 #include <net/netns/generic.h> 172 #include <asm/byteorder.h> 173 #include <linux/rcupdate.h> 174 #include <linux/bitops.h> 175 #include <linux/io.h> 176 #include <linux/timex.h> 177 #include <linux/uaccess.h> 178 #include <asm/dma.h> 179 #include <asm/div64.h> /* do_div */ 180 181 #define VERSION "2.75" 182 #define IP_NAME_SZ 32 183 #define MAX_MPLS_LABELS 16 /* This is the max label stack depth */ 184 #define MPLS_STACK_BOTTOM htonl(0x00000100) 185 186 #define func_enter() pr_debug("entering %s\n", __func__); 187 188 #define PKT_FLAGS \ 189 pf(IPV6) /* Interface in IPV6 Mode */ \ 190 pf(IPSRC_RND) /* IP-Src Random */ \ 191 pf(IPDST_RND) /* IP-Dst Random */ \ 192 pf(TXSIZE_RND) /* Transmit size is random */ \ 193 pf(UDPSRC_RND) /* UDP-Src Random */ \ 194 pf(UDPDST_RND) /* UDP-Dst Random */ \ 195 pf(UDPCSUM) /* Include UDP checksum */ \ 196 pf(NO_TIMESTAMP) /* Don't timestamp packets (default TS) */ \ 197 pf(MPLS_RND) /* Random MPLS labels */ \ 198 pf(QUEUE_MAP_RND) /* queue map Random */ \ 199 pf(QUEUE_MAP_CPU) /* queue map mirrors smp_processor_id() */ \ 200 pf(FLOW_SEQ) /* Sequential flows */ \ 201 pf(IPSEC) /* ipsec on for flows */ \ 202 pf(MACSRC_RND) /* MAC-Src Random */ \ 203 pf(MACDST_RND) /* MAC-Dst Random */ \ 204 pf(VID_RND) /* Random VLAN ID */ \ 205 pf(SVID_RND) /* Random SVLAN ID */ \ 206 pf(NODE) /* Node memory alloc*/ \ 207 208 #define pf(flag) flag##_SHIFT, 209 enum pkt_flags { 210 PKT_FLAGS 211 }; 212 #undef pf 213 214 /* Device flag bits */ 215 #define pf(flag) static const __u32 F_##flag = (1<<flag##_SHIFT); 216 PKT_FLAGS 217 #undef pf 218 219 #define pf(flag) __stringify(flag), 220 static char *pkt_flag_names[] = { 221 PKT_FLAGS 222 }; 223 #undef pf 224 225 #define NR_PKT_FLAGS ARRAY_SIZE(pkt_flag_names) 226 227 /* Thread control flag bits */ 228 #define T_STOP (1<<0) /* Stop run */ 229 #define T_RUN (1<<1) /* Start run */ 230 #define T_REMDEVALL (1<<2) /* Remove all devs */ 231 #define T_REMDEV (1<<3) /* Remove one dev */ 232 233 /* Xmit modes */ 234 #define M_START_XMIT 0 /* Default normal TX */ 235 #define M_NETIF_RECEIVE 1 /* Inject packets into stack */ 236 #define M_QUEUE_XMIT 2 /* Inject packet into qdisc */ 237 238 /* If lock -- protects updating of if_list */ 239 #define if_lock(t) mutex_lock(&(t->if_lock)); 240 #define if_unlock(t) mutex_unlock(&(t->if_lock)); 241 242 /* Used to help with determining the pkts on receive */ 243 #define PKTGEN_MAGIC 0xbe9be955 244 #define PG_PROC_DIR "pktgen" 245 #define PGCTRL "pgctrl" 246 247 #define MAX_CFLOWS 65536 248 249 #define VLAN_TAG_SIZE(x) ((x)->vlan_id == 0xffff ? 0 : 4) 250 #define SVLAN_TAG_SIZE(x) ((x)->svlan_id == 0xffff ? 0 : 4) 251 252 struct flow_state { 253 __be32 cur_daddr; 254 int count; 255 #ifdef CONFIG_XFRM 256 struct xfrm_state *x; 257 #endif 258 __u32 flags; 259 }; 260 261 /* flow flag bits */ 262 #define F_INIT (1<<0) /* flow has been initialized */ 263 264 struct pktgen_dev { 265 /* 266 * Try to keep frequent/infrequent used vars. separated. 267 */ 268 struct proc_dir_entry *entry; /* proc file */ 269 struct pktgen_thread *pg_thread;/* the owner */ 270 struct list_head list; /* chaining in the thread's run-queue */ 271 struct rcu_head rcu; /* freed by RCU */ 272 273 int running; /* if false, the test will stop */ 274 275 /* If min != max, then we will either do a linear iteration, or 276 * we will do a random selection from within the range. 277 */ 278 __u32 flags; 279 int xmit_mode; 280 int min_pkt_size; 281 int max_pkt_size; 282 int pkt_overhead; /* overhead for MPLS, VLANs, IPSEC etc */ 283 int nfrags; 284 int removal_mark; /* non-zero => the device is marked for 285 * removal by worker thread */ 286 287 struct page *page; 288 u64 delay; /* nano-seconds */ 289 290 __u64 count; /* Default No packets to send */ 291 __u64 sofar; /* How many pkts we've sent so far */ 292 __u64 tx_bytes; /* How many bytes we've transmitted */ 293 __u64 errors; /* Errors when trying to transmit, */ 294 295 /* runtime counters relating to clone_skb */ 296 297 __u32 clone_count; 298 int last_ok; /* Was last skb sent? 299 * Or a failed transmit of some sort? 300 * This will keep sequence numbers in order 301 */ 302 ktime_t next_tx; 303 ktime_t started_at; 304 ktime_t stopped_at; 305 u64 idle_acc; /* nano-seconds */ 306 307 __u32 seq_num; 308 309 int clone_skb; /* 310 * Use multiple SKBs during packet gen. 311 * If this number is greater than 1, then 312 * that many copies of the same packet will be 313 * sent before a new packet is allocated. 314 * If you want to send 1024 identical packets 315 * before creating a new packet, 316 * set clone_skb to 1024. 317 */ 318 319 char dst_min[IP_NAME_SZ]; /* IP, ie 1.2.3.4 */ 320 char dst_max[IP_NAME_SZ]; /* IP, ie 1.2.3.4 */ 321 char src_min[IP_NAME_SZ]; /* IP, ie 1.2.3.4 */ 322 char src_max[IP_NAME_SZ]; /* IP, ie 1.2.3.4 */ 323 324 struct in6_addr in6_saddr; 325 struct in6_addr in6_daddr; 326 struct in6_addr cur_in6_daddr; 327 struct in6_addr cur_in6_saddr; 328 /* For ranges */ 329 struct in6_addr min_in6_daddr; 330 struct in6_addr max_in6_daddr; 331 struct in6_addr min_in6_saddr; 332 struct in6_addr max_in6_saddr; 333 334 /* If we're doing ranges, random or incremental, then this 335 * defines the min/max for those ranges. 336 */ 337 __be32 saddr_min; /* inclusive, source IP address */ 338 __be32 saddr_max; /* exclusive, source IP address */ 339 __be32 daddr_min; /* inclusive, dest IP address */ 340 __be32 daddr_max; /* exclusive, dest IP address */ 341 342 __u16 udp_src_min; /* inclusive, source UDP port */ 343 __u16 udp_src_max; /* exclusive, source UDP port */ 344 __u16 udp_dst_min; /* inclusive, dest UDP port */ 345 __u16 udp_dst_max; /* exclusive, dest UDP port */ 346 347 /* DSCP + ECN */ 348 __u8 tos; /* six MSB of (former) IPv4 TOS 349 are for dscp codepoint */ 350 __u8 traffic_class; /* ditto for the (former) Traffic Class in IPv6 351 (see RFC 3260, sec. 4) */ 352 353 /* MPLS */ 354 unsigned int nr_labels; /* Depth of stack, 0 = no MPLS */ 355 __be32 labels[MAX_MPLS_LABELS]; 356 357 /* VLAN/SVLAN (802.1Q/Q-in-Q) */ 358 __u8 vlan_p; 359 __u8 vlan_cfi; 360 __u16 vlan_id; /* 0xffff means no vlan tag */ 361 362 __u8 svlan_p; 363 __u8 svlan_cfi; 364 __u16 svlan_id; /* 0xffff means no svlan tag */ 365 366 __u32 src_mac_count; /* How many MACs to iterate through */ 367 __u32 dst_mac_count; /* How many MACs to iterate through */ 368 369 unsigned char dst_mac[ETH_ALEN]; 370 unsigned char src_mac[ETH_ALEN]; 371 372 __u32 cur_dst_mac_offset; 373 __u32 cur_src_mac_offset; 374 __be32 cur_saddr; 375 __be32 cur_daddr; 376 __u16 ip_id; 377 __u16 cur_udp_dst; 378 __u16 cur_udp_src; 379 __u16 cur_queue_map; 380 __u32 cur_pkt_size; 381 __u32 last_pkt_size; 382 383 __u8 hh[14]; 384 /* = { 385 0x00, 0x80, 0xC8, 0x79, 0xB3, 0xCB, 386 387 We fill in SRC address later 388 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 389 0x08, 0x00 390 }; 391 */ 392 __u16 pad; /* pad out the hh struct to an even 16 bytes */ 393 394 struct sk_buff *skb; /* skb we are to transmit next, used for when we 395 * are transmitting the same one multiple times 396 */ 397 struct net_device *odev; /* The out-going device. 398 * Note that the device should have it's 399 * pg_info pointer pointing back to this 400 * device. 401 * Set when the user specifies the out-going 402 * device name (not when the inject is 403 * started as it used to do.) 404 */ 405 char odevname[32]; 406 struct flow_state *flows; 407 unsigned int cflows; /* Concurrent flows (config) */ 408 unsigned int lflow; /* Flow length (config) */ 409 unsigned int nflows; /* accumulated flows (stats) */ 410 unsigned int curfl; /* current sequenced flow (state)*/ 411 412 u16 queue_map_min; 413 u16 queue_map_max; 414 __u32 skb_priority; /* skb priority field */ 415 unsigned int burst; /* number of duplicated packets to burst */ 416 int node; /* Memory node */ 417 418 #ifdef CONFIG_XFRM 419 __u8 ipsmode; /* IPSEC mode (config) */ 420 __u8 ipsproto; /* IPSEC type (config) */ 421 __u32 spi; 422 struct xfrm_dst xdst; 423 struct dst_ops dstops; 424 #endif 425 char result[512]; 426 }; 427 428 struct pktgen_hdr { 429 __be32 pgh_magic; 430 __be32 seq_num; 431 __be32 tv_sec; 432 __be32 tv_usec; 433 }; 434 435 436 static unsigned int pg_net_id __read_mostly; 437 438 struct pktgen_net { 439 struct net *net; 440 struct proc_dir_entry *proc_dir; 441 struct list_head pktgen_threads; 442 bool pktgen_exiting; 443 }; 444 445 struct pktgen_thread { 446 struct mutex if_lock; /* for list of devices */ 447 struct list_head if_list; /* All device here */ 448 struct list_head th_list; 449 struct task_struct *tsk; 450 char result[512]; 451 452 /* Field for thread to receive "posted" events terminate, 453 stop ifs etc. */ 454 455 u32 control; 456 int cpu; 457 458 wait_queue_head_t queue; 459 struct completion start_done; 460 struct pktgen_net *net; 461 }; 462 463 #define REMOVE 1 464 #define FIND 0 465 466 static const char version[] = 467 "Packet Generator for packet performance testing. " 468 "Version: " VERSION "\n"; 469 470 static int pktgen_remove_device(struct pktgen_thread *t, struct pktgen_dev *i); 471 static int pktgen_add_device(struct pktgen_thread *t, const char *ifname); 472 static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t, 473 const char *ifname, bool exact); 474 static int pktgen_device_event(struct notifier_block *, unsigned long, void *); 475 static void pktgen_run_all_threads(struct pktgen_net *pn); 476 static void pktgen_reset_all_threads(struct pktgen_net *pn); 477 static void pktgen_stop_all_threads_ifs(struct pktgen_net *pn); 478 479 static void pktgen_stop(struct pktgen_thread *t); 480 static void pktgen_clear_counters(struct pktgen_dev *pkt_dev); 481 482 /* Module parameters, defaults. */ 483 static int pg_count_d __read_mostly = 1000; 484 static int pg_delay_d __read_mostly; 485 static int pg_clone_skb_d __read_mostly; 486 static int debug __read_mostly; 487 488 static DEFINE_MUTEX(pktgen_thread_lock); 489 490 static struct notifier_block pktgen_notifier_block = { 491 .notifier_call = pktgen_device_event, 492 }; 493 494 /* 495 * /proc handling functions 496 * 497 */ 498 499 static int pgctrl_show(struct seq_file *seq, void *v) 500 { 501 seq_puts(seq, version); 502 return 0; 503 } 504 505 static ssize_t pgctrl_write(struct file *file, const char __user *buf, 506 size_t count, loff_t *ppos) 507 { 508 char data[128]; 509 struct pktgen_net *pn = net_generic(current->nsproxy->net_ns, pg_net_id); 510 511 if (!capable(CAP_NET_ADMIN)) 512 return -EPERM; 513 514 if (count == 0) 515 return -EINVAL; 516 517 if (count > sizeof(data)) 518 count = sizeof(data); 519 520 if (copy_from_user(data, buf, count)) 521 return -EFAULT; 522 523 data[count - 1] = 0; /* Strip trailing '\n' and terminate string */ 524 525 if (!strcmp(data, "stop")) 526 pktgen_stop_all_threads_ifs(pn); 527 528 else if (!strcmp(data, "start")) 529 pktgen_run_all_threads(pn); 530 531 else if (!strcmp(data, "reset")) 532 pktgen_reset_all_threads(pn); 533 534 else 535 return -EINVAL; 536 537 return count; 538 } 539 540 static int pgctrl_open(struct inode *inode, struct file *file) 541 { 542 return single_open(file, pgctrl_show, PDE_DATA(inode)); 543 } 544 545 static const struct file_operations pktgen_fops = { 546 .open = pgctrl_open, 547 .read = seq_read, 548 .llseek = seq_lseek, 549 .write = pgctrl_write, 550 .release = single_release, 551 }; 552 553 static int pktgen_if_show(struct seq_file *seq, void *v) 554 { 555 const struct pktgen_dev *pkt_dev = seq->private; 556 ktime_t stopped; 557 unsigned int i; 558 u64 idle; 559 560 seq_printf(seq, 561 "Params: count %llu min_pkt_size: %u max_pkt_size: %u\n", 562 (unsigned long long)pkt_dev->count, pkt_dev->min_pkt_size, 563 pkt_dev->max_pkt_size); 564 565 seq_printf(seq, 566 " frags: %d delay: %llu clone_skb: %d ifname: %s\n", 567 pkt_dev->nfrags, (unsigned long long) pkt_dev->delay, 568 pkt_dev->clone_skb, pkt_dev->odevname); 569 570 seq_printf(seq, " flows: %u flowlen: %u\n", pkt_dev->cflows, 571 pkt_dev->lflow); 572 573 seq_printf(seq, 574 " queue_map_min: %u queue_map_max: %u\n", 575 pkt_dev->queue_map_min, 576 pkt_dev->queue_map_max); 577 578 if (pkt_dev->skb_priority) 579 seq_printf(seq, " skb_priority: %u\n", 580 pkt_dev->skb_priority); 581 582 if (pkt_dev->flags & F_IPV6) { 583 seq_printf(seq, 584 " saddr: %pI6c min_saddr: %pI6c max_saddr: %pI6c\n" 585 " daddr: %pI6c min_daddr: %pI6c max_daddr: %pI6c\n", 586 &pkt_dev->in6_saddr, 587 &pkt_dev->min_in6_saddr, &pkt_dev->max_in6_saddr, 588 &pkt_dev->in6_daddr, 589 &pkt_dev->min_in6_daddr, &pkt_dev->max_in6_daddr); 590 } else { 591 seq_printf(seq, 592 " dst_min: %s dst_max: %s\n", 593 pkt_dev->dst_min, pkt_dev->dst_max); 594 seq_printf(seq, 595 " src_min: %s src_max: %s\n", 596 pkt_dev->src_min, pkt_dev->src_max); 597 } 598 599 seq_puts(seq, " src_mac: "); 600 601 seq_printf(seq, "%pM ", 602 is_zero_ether_addr(pkt_dev->src_mac) ? 603 pkt_dev->odev->dev_addr : pkt_dev->src_mac); 604 605 seq_puts(seq, "dst_mac: "); 606 seq_printf(seq, "%pM\n", pkt_dev->dst_mac); 607 608 seq_printf(seq, 609 " udp_src_min: %d udp_src_max: %d" 610 " udp_dst_min: %d udp_dst_max: %d\n", 611 pkt_dev->udp_src_min, pkt_dev->udp_src_max, 612 pkt_dev->udp_dst_min, pkt_dev->udp_dst_max); 613 614 seq_printf(seq, 615 " src_mac_count: %d dst_mac_count: %d\n", 616 pkt_dev->src_mac_count, pkt_dev->dst_mac_count); 617 618 if (pkt_dev->nr_labels) { 619 seq_puts(seq, " mpls: "); 620 for (i = 0; i < pkt_dev->nr_labels; i++) 621 seq_printf(seq, "%08x%s", ntohl(pkt_dev->labels[i]), 622 i == pkt_dev->nr_labels-1 ? "\n" : ", "); 623 } 624 625 if (pkt_dev->vlan_id != 0xffff) 626 seq_printf(seq, " vlan_id: %u vlan_p: %u vlan_cfi: %u\n", 627 pkt_dev->vlan_id, pkt_dev->vlan_p, 628 pkt_dev->vlan_cfi); 629 630 if (pkt_dev->svlan_id != 0xffff) 631 seq_printf(seq, " svlan_id: %u vlan_p: %u vlan_cfi: %u\n", 632 pkt_dev->svlan_id, pkt_dev->svlan_p, 633 pkt_dev->svlan_cfi); 634 635 if (pkt_dev->tos) 636 seq_printf(seq, " tos: 0x%02x\n", pkt_dev->tos); 637 638 if (pkt_dev->traffic_class) 639 seq_printf(seq, " traffic_class: 0x%02x\n", pkt_dev->traffic_class); 640 641 if (pkt_dev->burst > 1) 642 seq_printf(seq, " burst: %d\n", pkt_dev->burst); 643 644 if (pkt_dev->node >= 0) 645 seq_printf(seq, " node: %d\n", pkt_dev->node); 646 647 if (pkt_dev->xmit_mode == M_NETIF_RECEIVE) 648 seq_puts(seq, " xmit_mode: netif_receive\n"); 649 else if (pkt_dev->xmit_mode == M_QUEUE_XMIT) 650 seq_puts(seq, " xmit_mode: xmit_queue\n"); 651 652 seq_puts(seq, " Flags: "); 653 654 for (i = 0; i < NR_PKT_FLAGS; i++) { 655 if (i == F_FLOW_SEQ) 656 if (!pkt_dev->cflows) 657 continue; 658 659 if (pkt_dev->flags & (1 << i)) 660 seq_printf(seq, "%s ", pkt_flag_names[i]); 661 else if (i == F_FLOW_SEQ) 662 seq_puts(seq, "FLOW_RND "); 663 664 #ifdef CONFIG_XFRM 665 if (i == F_IPSEC && pkt_dev->spi) 666 seq_printf(seq, "spi:%u", pkt_dev->spi); 667 #endif 668 } 669 670 seq_puts(seq, "\n"); 671 672 /* not really stopped, more like last-running-at */ 673 stopped = pkt_dev->running ? ktime_get() : pkt_dev->stopped_at; 674 idle = pkt_dev->idle_acc; 675 do_div(idle, NSEC_PER_USEC); 676 677 seq_printf(seq, 678 "Current:\n pkts-sofar: %llu errors: %llu\n", 679 (unsigned long long)pkt_dev->sofar, 680 (unsigned long long)pkt_dev->errors); 681 682 seq_printf(seq, 683 " started: %lluus stopped: %lluus idle: %lluus\n", 684 (unsigned long long) ktime_to_us(pkt_dev->started_at), 685 (unsigned long long) ktime_to_us(stopped), 686 (unsigned long long) idle); 687 688 seq_printf(seq, 689 " seq_num: %d cur_dst_mac_offset: %d cur_src_mac_offset: %d\n", 690 pkt_dev->seq_num, pkt_dev->cur_dst_mac_offset, 691 pkt_dev->cur_src_mac_offset); 692 693 if (pkt_dev->flags & F_IPV6) { 694 seq_printf(seq, " cur_saddr: %pI6c cur_daddr: %pI6c\n", 695 &pkt_dev->cur_in6_saddr, 696 &pkt_dev->cur_in6_daddr); 697 } else 698 seq_printf(seq, " cur_saddr: %pI4 cur_daddr: %pI4\n", 699 &pkt_dev->cur_saddr, &pkt_dev->cur_daddr); 700 701 seq_printf(seq, " cur_udp_dst: %d cur_udp_src: %d\n", 702 pkt_dev->cur_udp_dst, pkt_dev->cur_udp_src); 703 704 seq_printf(seq, " cur_queue_map: %u\n", pkt_dev->cur_queue_map); 705 706 seq_printf(seq, " flows: %u\n", pkt_dev->nflows); 707 708 if (pkt_dev->result[0]) 709 seq_printf(seq, "Result: %s\n", pkt_dev->result); 710 else 711 seq_puts(seq, "Result: Idle\n"); 712 713 return 0; 714 } 715 716 717 static int hex32_arg(const char __user *user_buffer, unsigned long maxlen, 718 __u32 *num) 719 { 720 int i = 0; 721 *num = 0; 722 723 for (; i < maxlen; i++) { 724 int value; 725 char c; 726 *num <<= 4; 727 if (get_user(c, &user_buffer[i])) 728 return -EFAULT; 729 value = hex_to_bin(c); 730 if (value >= 0) 731 *num |= value; 732 else 733 break; 734 } 735 return i; 736 } 737 738 static int count_trail_chars(const char __user * user_buffer, 739 unsigned int maxlen) 740 { 741 int i; 742 743 for (i = 0; i < maxlen; i++) { 744 char c; 745 if (get_user(c, &user_buffer[i])) 746 return -EFAULT; 747 switch (c) { 748 case '\"': 749 case '\n': 750 case '\r': 751 case '\t': 752 case ' ': 753 case '=': 754 break; 755 default: 756 goto done; 757 } 758 } 759 done: 760 return i; 761 } 762 763 static long num_arg(const char __user *user_buffer, unsigned long maxlen, 764 unsigned long *num) 765 { 766 int i; 767 *num = 0; 768 769 for (i = 0; i < maxlen; i++) { 770 char c; 771 if (get_user(c, &user_buffer[i])) 772 return -EFAULT; 773 if ((c >= '0') && (c <= '9')) { 774 *num *= 10; 775 *num += c - '0'; 776 } else 777 break; 778 } 779 return i; 780 } 781 782 static int strn_len(const char __user * user_buffer, unsigned int maxlen) 783 { 784 int i; 785 786 for (i = 0; i < maxlen; i++) { 787 char c; 788 if (get_user(c, &user_buffer[i])) 789 return -EFAULT; 790 switch (c) { 791 case '\"': 792 case '\n': 793 case '\r': 794 case '\t': 795 case ' ': 796 goto done_str; 797 default: 798 break; 799 } 800 } 801 done_str: 802 return i; 803 } 804 805 static ssize_t get_labels(const char __user *buffer, struct pktgen_dev *pkt_dev) 806 { 807 unsigned int n = 0; 808 char c; 809 ssize_t i = 0; 810 int len; 811 812 pkt_dev->nr_labels = 0; 813 do { 814 __u32 tmp; 815 len = hex32_arg(&buffer[i], 8, &tmp); 816 if (len <= 0) 817 return len; 818 pkt_dev->labels[n] = htonl(tmp); 819 if (pkt_dev->labels[n] & MPLS_STACK_BOTTOM) 820 pkt_dev->flags |= F_MPLS_RND; 821 i += len; 822 if (get_user(c, &buffer[i])) 823 return -EFAULT; 824 i++; 825 n++; 826 if (n >= MAX_MPLS_LABELS) 827 return -E2BIG; 828 } while (c == ','); 829 830 pkt_dev->nr_labels = n; 831 return i; 832 } 833 834 static __u32 pktgen_read_flag(const char *f, bool *disable) 835 { 836 __u32 i; 837 838 if (f[0] == '!') { 839 *disable = true; 840 f++; 841 } 842 843 for (i = 0; i < NR_PKT_FLAGS; i++) { 844 if (!IS_ENABLED(CONFIG_XFRM) && i == IPSEC_SHIFT) 845 continue; 846 847 /* allow only disabling ipv6 flag */ 848 if (!*disable && i == IPV6_SHIFT) 849 continue; 850 851 if (strcmp(f, pkt_flag_names[i]) == 0) 852 return 1 << i; 853 } 854 855 if (strcmp(f, "FLOW_RND") == 0) { 856 *disable = !*disable; 857 return F_FLOW_SEQ; 858 } 859 860 return 0; 861 } 862 863 static ssize_t pktgen_if_write(struct file *file, 864 const char __user * user_buffer, size_t count, 865 loff_t * offset) 866 { 867 struct seq_file *seq = file->private_data; 868 struct pktgen_dev *pkt_dev = seq->private; 869 int i, max, len; 870 char name[16], valstr[32]; 871 unsigned long value = 0; 872 char *pg_result = NULL; 873 int tmp = 0; 874 char buf[128]; 875 876 pg_result = &(pkt_dev->result[0]); 877 878 if (count < 1) { 879 pr_warn("wrong command format\n"); 880 return -EINVAL; 881 } 882 883 max = count; 884 tmp = count_trail_chars(user_buffer, max); 885 if (tmp < 0) { 886 pr_warn("illegal format\n"); 887 return tmp; 888 } 889 i = tmp; 890 891 /* Read variable name */ 892 893 len = strn_len(&user_buffer[i], sizeof(name) - 1); 894 if (len < 0) 895 return len; 896 897 memset(name, 0, sizeof(name)); 898 if (copy_from_user(name, &user_buffer[i], len)) 899 return -EFAULT; 900 i += len; 901 902 max = count - i; 903 len = count_trail_chars(&user_buffer[i], max); 904 if (len < 0) 905 return len; 906 907 i += len; 908 909 if (debug) { 910 size_t copy = min_t(size_t, count + 1, 1024); 911 char *tp = strndup_user(user_buffer, copy); 912 913 if (IS_ERR(tp)) 914 return PTR_ERR(tp); 915 916 pr_debug("%s,%zu buffer -:%s:-\n", name, count, tp); 917 kfree(tp); 918 } 919 920 if (!strcmp(name, "min_pkt_size")) { 921 len = num_arg(&user_buffer[i], 10, &value); 922 if (len < 0) 923 return len; 924 925 i += len; 926 if (value < 14 + 20 + 8) 927 value = 14 + 20 + 8; 928 if (value != pkt_dev->min_pkt_size) { 929 pkt_dev->min_pkt_size = value; 930 pkt_dev->cur_pkt_size = value; 931 } 932 sprintf(pg_result, "OK: min_pkt_size=%u", 933 pkt_dev->min_pkt_size); 934 return count; 935 } 936 937 if (!strcmp(name, "max_pkt_size")) { 938 len = num_arg(&user_buffer[i], 10, &value); 939 if (len < 0) 940 return len; 941 942 i += len; 943 if (value < 14 + 20 + 8) 944 value = 14 + 20 + 8; 945 if (value != pkt_dev->max_pkt_size) { 946 pkt_dev->max_pkt_size = value; 947 pkt_dev->cur_pkt_size = value; 948 } 949 sprintf(pg_result, "OK: max_pkt_size=%u", 950 pkt_dev->max_pkt_size); 951 return count; 952 } 953 954 /* Shortcut for min = max */ 955 956 if (!strcmp(name, "pkt_size")) { 957 len = num_arg(&user_buffer[i], 10, &value); 958 if (len < 0) 959 return len; 960 961 i += len; 962 if (value < 14 + 20 + 8) 963 value = 14 + 20 + 8; 964 if (value != pkt_dev->min_pkt_size) { 965 pkt_dev->min_pkt_size = value; 966 pkt_dev->max_pkt_size = value; 967 pkt_dev->cur_pkt_size = value; 968 } 969 sprintf(pg_result, "OK: pkt_size=%u", pkt_dev->min_pkt_size); 970 return count; 971 } 972 973 if (!strcmp(name, "debug")) { 974 len = num_arg(&user_buffer[i], 10, &value); 975 if (len < 0) 976 return len; 977 978 i += len; 979 debug = value; 980 sprintf(pg_result, "OK: debug=%u", debug); 981 return count; 982 } 983 984 if (!strcmp(name, "frags")) { 985 len = num_arg(&user_buffer[i], 10, &value); 986 if (len < 0) 987 return len; 988 989 i += len; 990 pkt_dev->nfrags = value; 991 sprintf(pg_result, "OK: frags=%u", pkt_dev->nfrags); 992 return count; 993 } 994 if (!strcmp(name, "delay")) { 995 len = num_arg(&user_buffer[i], 10, &value); 996 if (len < 0) 997 return len; 998 999 i += len; 1000 if (value == 0x7FFFFFFF) 1001 pkt_dev->delay = ULLONG_MAX; 1002 else 1003 pkt_dev->delay = (u64)value; 1004 1005 sprintf(pg_result, "OK: delay=%llu", 1006 (unsigned long long) pkt_dev->delay); 1007 return count; 1008 } 1009 if (!strcmp(name, "rate")) { 1010 len = num_arg(&user_buffer[i], 10, &value); 1011 if (len < 0) 1012 return len; 1013 1014 i += len; 1015 if (!value) 1016 return len; 1017 pkt_dev->delay = pkt_dev->min_pkt_size*8*NSEC_PER_USEC/value; 1018 if (debug) 1019 pr_info("Delay set at: %llu ns\n", pkt_dev->delay); 1020 1021 sprintf(pg_result, "OK: rate=%lu", value); 1022 return count; 1023 } 1024 if (!strcmp(name, "ratep")) { 1025 len = num_arg(&user_buffer[i], 10, &value); 1026 if (len < 0) 1027 return len; 1028 1029 i += len; 1030 if (!value) 1031 return len; 1032 pkt_dev->delay = NSEC_PER_SEC/value; 1033 if (debug) 1034 pr_info("Delay set at: %llu ns\n", pkt_dev->delay); 1035 1036 sprintf(pg_result, "OK: rate=%lu", value); 1037 return count; 1038 } 1039 if (!strcmp(name, "udp_src_min")) { 1040 len = num_arg(&user_buffer[i], 10, &value); 1041 if (len < 0) 1042 return len; 1043 1044 i += len; 1045 if (value != pkt_dev->udp_src_min) { 1046 pkt_dev->udp_src_min = value; 1047 pkt_dev->cur_udp_src = value; 1048 } 1049 sprintf(pg_result, "OK: udp_src_min=%u", pkt_dev->udp_src_min); 1050 return count; 1051 } 1052 if (!strcmp(name, "udp_dst_min")) { 1053 len = num_arg(&user_buffer[i], 10, &value); 1054 if (len < 0) 1055 return len; 1056 1057 i += len; 1058 if (value != pkt_dev->udp_dst_min) { 1059 pkt_dev->udp_dst_min = value; 1060 pkt_dev->cur_udp_dst = value; 1061 } 1062 sprintf(pg_result, "OK: udp_dst_min=%u", pkt_dev->udp_dst_min); 1063 return count; 1064 } 1065 if (!strcmp(name, "udp_src_max")) { 1066 len = num_arg(&user_buffer[i], 10, &value); 1067 if (len < 0) 1068 return len; 1069 1070 i += len; 1071 if (value != pkt_dev->udp_src_max) { 1072 pkt_dev->udp_src_max = value; 1073 pkt_dev->cur_udp_src = value; 1074 } 1075 sprintf(pg_result, "OK: udp_src_max=%u", pkt_dev->udp_src_max); 1076 return count; 1077 } 1078 if (!strcmp(name, "udp_dst_max")) { 1079 len = num_arg(&user_buffer[i], 10, &value); 1080 if (len < 0) 1081 return len; 1082 1083 i += len; 1084 if (value != pkt_dev->udp_dst_max) { 1085 pkt_dev->udp_dst_max = value; 1086 pkt_dev->cur_udp_dst = value; 1087 } 1088 sprintf(pg_result, "OK: udp_dst_max=%u", pkt_dev->udp_dst_max); 1089 return count; 1090 } 1091 if (!strcmp(name, "clone_skb")) { 1092 len = num_arg(&user_buffer[i], 10, &value); 1093 if (len < 0) 1094 return len; 1095 if ((value > 0) && 1096 ((pkt_dev->xmit_mode == M_NETIF_RECEIVE) || 1097 !(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING))) 1098 return -ENOTSUPP; 1099 i += len; 1100 pkt_dev->clone_skb = value; 1101 1102 sprintf(pg_result, "OK: clone_skb=%d", pkt_dev->clone_skb); 1103 return count; 1104 } 1105 if (!strcmp(name, "count")) { 1106 len = num_arg(&user_buffer[i], 10, &value); 1107 if (len < 0) 1108 return len; 1109 1110 i += len; 1111 pkt_dev->count = value; 1112 sprintf(pg_result, "OK: count=%llu", 1113 (unsigned long long)pkt_dev->count); 1114 return count; 1115 } 1116 if (!strcmp(name, "src_mac_count")) { 1117 len = num_arg(&user_buffer[i], 10, &value); 1118 if (len < 0) 1119 return len; 1120 1121 i += len; 1122 if (pkt_dev->src_mac_count != value) { 1123 pkt_dev->src_mac_count = value; 1124 pkt_dev->cur_src_mac_offset = 0; 1125 } 1126 sprintf(pg_result, "OK: src_mac_count=%d", 1127 pkt_dev->src_mac_count); 1128 return count; 1129 } 1130 if (!strcmp(name, "dst_mac_count")) { 1131 len = num_arg(&user_buffer[i], 10, &value); 1132 if (len < 0) 1133 return len; 1134 1135 i += len; 1136 if (pkt_dev->dst_mac_count != value) { 1137 pkt_dev->dst_mac_count = value; 1138 pkt_dev->cur_dst_mac_offset = 0; 1139 } 1140 sprintf(pg_result, "OK: dst_mac_count=%d", 1141 pkt_dev->dst_mac_count); 1142 return count; 1143 } 1144 if (!strcmp(name, "burst")) { 1145 len = num_arg(&user_buffer[i], 10, &value); 1146 if (len < 0) 1147 return len; 1148 1149 i += len; 1150 if ((value > 1) && 1151 ((pkt_dev->xmit_mode == M_QUEUE_XMIT) || 1152 ((pkt_dev->xmit_mode == M_START_XMIT) && 1153 (!(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING))))) 1154 return -ENOTSUPP; 1155 pkt_dev->burst = value < 1 ? 1 : value; 1156 sprintf(pg_result, "OK: burst=%d", pkt_dev->burst); 1157 return count; 1158 } 1159 if (!strcmp(name, "node")) { 1160 len = num_arg(&user_buffer[i], 10, &value); 1161 if (len < 0) 1162 return len; 1163 1164 i += len; 1165 1166 if (node_possible(value)) { 1167 pkt_dev->node = value; 1168 sprintf(pg_result, "OK: node=%d", pkt_dev->node); 1169 if (pkt_dev->page) { 1170 put_page(pkt_dev->page); 1171 pkt_dev->page = NULL; 1172 } 1173 } 1174 else 1175 sprintf(pg_result, "ERROR: node not possible"); 1176 return count; 1177 } 1178 if (!strcmp(name, "xmit_mode")) { 1179 char f[32]; 1180 1181 memset(f, 0, 32); 1182 len = strn_len(&user_buffer[i], sizeof(f) - 1); 1183 if (len < 0) 1184 return len; 1185 1186 if (copy_from_user(f, &user_buffer[i], len)) 1187 return -EFAULT; 1188 i += len; 1189 1190 if (strcmp(f, "start_xmit") == 0) { 1191 pkt_dev->xmit_mode = M_START_XMIT; 1192 } else if (strcmp(f, "netif_receive") == 0) { 1193 /* clone_skb set earlier, not supported in this mode */ 1194 if (pkt_dev->clone_skb > 0) 1195 return -ENOTSUPP; 1196 1197 pkt_dev->xmit_mode = M_NETIF_RECEIVE; 1198 1199 /* make sure new packet is allocated every time 1200 * pktgen_xmit() is called 1201 */ 1202 pkt_dev->last_ok = 1; 1203 1204 /* override clone_skb if user passed default value 1205 * at module loading time 1206 */ 1207 pkt_dev->clone_skb = 0; 1208 } else if (strcmp(f, "queue_xmit") == 0) { 1209 pkt_dev->xmit_mode = M_QUEUE_XMIT; 1210 pkt_dev->last_ok = 1; 1211 } else { 1212 sprintf(pg_result, 1213 "xmit_mode -:%s:- unknown\nAvailable modes: %s", 1214 f, "start_xmit, netif_receive\n"); 1215 return count; 1216 } 1217 sprintf(pg_result, "OK: xmit_mode=%s", f); 1218 return count; 1219 } 1220 if (!strcmp(name, "flag")) { 1221 __u32 flag; 1222 char f[32]; 1223 bool disable = false; 1224 1225 memset(f, 0, 32); 1226 len = strn_len(&user_buffer[i], sizeof(f) - 1); 1227 if (len < 0) 1228 return len; 1229 1230 if (copy_from_user(f, &user_buffer[i], len)) 1231 return -EFAULT; 1232 i += len; 1233 1234 flag = pktgen_read_flag(f, &disable); 1235 1236 if (flag) { 1237 if (disable) 1238 pkt_dev->flags &= ~flag; 1239 else 1240 pkt_dev->flags |= flag; 1241 } else { 1242 sprintf(pg_result, 1243 "Flag -:%s:- unknown\nAvailable flags, (prepend ! to un-set flag):\n%s", 1244 f, 1245 "IPSRC_RND, IPDST_RND, UDPSRC_RND, UDPDST_RND, " 1246 "MACSRC_RND, MACDST_RND, TXSIZE_RND, IPV6, " 1247 "MPLS_RND, VID_RND, SVID_RND, FLOW_SEQ, " 1248 "QUEUE_MAP_RND, QUEUE_MAP_CPU, UDPCSUM, " 1249 "NO_TIMESTAMP, " 1250 #ifdef CONFIG_XFRM 1251 "IPSEC, " 1252 #endif 1253 "NODE_ALLOC\n"); 1254 return count; 1255 } 1256 sprintf(pg_result, "OK: flags=0x%x", pkt_dev->flags); 1257 return count; 1258 } 1259 if (!strcmp(name, "dst_min") || !strcmp(name, "dst")) { 1260 len = strn_len(&user_buffer[i], sizeof(pkt_dev->dst_min) - 1); 1261 if (len < 0) 1262 return len; 1263 1264 if (copy_from_user(buf, &user_buffer[i], len)) 1265 return -EFAULT; 1266 buf[len] = 0; 1267 if (strcmp(buf, pkt_dev->dst_min) != 0) { 1268 memset(pkt_dev->dst_min, 0, sizeof(pkt_dev->dst_min)); 1269 strcpy(pkt_dev->dst_min, buf); 1270 pkt_dev->daddr_min = in_aton(pkt_dev->dst_min); 1271 pkt_dev->cur_daddr = pkt_dev->daddr_min; 1272 } 1273 if (debug) 1274 pr_debug("dst_min set to: %s\n", pkt_dev->dst_min); 1275 i += len; 1276 sprintf(pg_result, "OK: dst_min=%s", pkt_dev->dst_min); 1277 return count; 1278 } 1279 if (!strcmp(name, "dst_max")) { 1280 len = strn_len(&user_buffer[i], sizeof(pkt_dev->dst_max) - 1); 1281 if (len < 0) 1282 return len; 1283 1284 if (copy_from_user(buf, &user_buffer[i], len)) 1285 return -EFAULT; 1286 buf[len] = 0; 1287 if (strcmp(buf, pkt_dev->dst_max) != 0) { 1288 memset(pkt_dev->dst_max, 0, sizeof(pkt_dev->dst_max)); 1289 strcpy(pkt_dev->dst_max, buf); 1290 pkt_dev->daddr_max = in_aton(pkt_dev->dst_max); 1291 pkt_dev->cur_daddr = pkt_dev->daddr_max; 1292 } 1293 if (debug) 1294 pr_debug("dst_max set to: %s\n", pkt_dev->dst_max); 1295 i += len; 1296 sprintf(pg_result, "OK: dst_max=%s", pkt_dev->dst_max); 1297 return count; 1298 } 1299 if (!strcmp(name, "dst6")) { 1300 len = strn_len(&user_buffer[i], sizeof(buf) - 1); 1301 if (len < 0) 1302 return len; 1303 1304 pkt_dev->flags |= F_IPV6; 1305 1306 if (copy_from_user(buf, &user_buffer[i], len)) 1307 return -EFAULT; 1308 buf[len] = 0; 1309 1310 in6_pton(buf, -1, pkt_dev->in6_daddr.s6_addr, -1, NULL); 1311 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->in6_daddr); 1312 1313 pkt_dev->cur_in6_daddr = pkt_dev->in6_daddr; 1314 1315 if (debug) 1316 pr_debug("dst6 set to: %s\n", buf); 1317 1318 i += len; 1319 sprintf(pg_result, "OK: dst6=%s", buf); 1320 return count; 1321 } 1322 if (!strcmp(name, "dst6_min")) { 1323 len = strn_len(&user_buffer[i], sizeof(buf) - 1); 1324 if (len < 0) 1325 return len; 1326 1327 pkt_dev->flags |= F_IPV6; 1328 1329 if (copy_from_user(buf, &user_buffer[i], len)) 1330 return -EFAULT; 1331 buf[len] = 0; 1332 1333 in6_pton(buf, -1, pkt_dev->min_in6_daddr.s6_addr, -1, NULL); 1334 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->min_in6_daddr); 1335 1336 pkt_dev->cur_in6_daddr = pkt_dev->min_in6_daddr; 1337 if (debug) 1338 pr_debug("dst6_min set to: %s\n", buf); 1339 1340 i += len; 1341 sprintf(pg_result, "OK: dst6_min=%s", buf); 1342 return count; 1343 } 1344 if (!strcmp(name, "dst6_max")) { 1345 len = strn_len(&user_buffer[i], sizeof(buf) - 1); 1346 if (len < 0) 1347 return len; 1348 1349 pkt_dev->flags |= F_IPV6; 1350 1351 if (copy_from_user(buf, &user_buffer[i], len)) 1352 return -EFAULT; 1353 buf[len] = 0; 1354 1355 in6_pton(buf, -1, pkt_dev->max_in6_daddr.s6_addr, -1, NULL); 1356 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->max_in6_daddr); 1357 1358 if (debug) 1359 pr_debug("dst6_max set to: %s\n", buf); 1360 1361 i += len; 1362 sprintf(pg_result, "OK: dst6_max=%s", buf); 1363 return count; 1364 } 1365 if (!strcmp(name, "src6")) { 1366 len = strn_len(&user_buffer[i], sizeof(buf) - 1); 1367 if (len < 0) 1368 return len; 1369 1370 pkt_dev->flags |= F_IPV6; 1371 1372 if (copy_from_user(buf, &user_buffer[i], len)) 1373 return -EFAULT; 1374 buf[len] = 0; 1375 1376 in6_pton(buf, -1, pkt_dev->in6_saddr.s6_addr, -1, NULL); 1377 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->in6_saddr); 1378 1379 pkt_dev->cur_in6_saddr = pkt_dev->in6_saddr; 1380 1381 if (debug) 1382 pr_debug("src6 set to: %s\n", buf); 1383 1384 i += len; 1385 sprintf(pg_result, "OK: src6=%s", buf); 1386 return count; 1387 } 1388 if (!strcmp(name, "src_min")) { 1389 len = strn_len(&user_buffer[i], sizeof(pkt_dev->src_min) - 1); 1390 if (len < 0) 1391 return len; 1392 1393 if (copy_from_user(buf, &user_buffer[i], len)) 1394 return -EFAULT; 1395 buf[len] = 0; 1396 if (strcmp(buf, pkt_dev->src_min) != 0) { 1397 memset(pkt_dev->src_min, 0, sizeof(pkt_dev->src_min)); 1398 strcpy(pkt_dev->src_min, buf); 1399 pkt_dev->saddr_min = in_aton(pkt_dev->src_min); 1400 pkt_dev->cur_saddr = pkt_dev->saddr_min; 1401 } 1402 if (debug) 1403 pr_debug("src_min set to: %s\n", pkt_dev->src_min); 1404 i += len; 1405 sprintf(pg_result, "OK: src_min=%s", pkt_dev->src_min); 1406 return count; 1407 } 1408 if (!strcmp(name, "src_max")) { 1409 len = strn_len(&user_buffer[i], sizeof(pkt_dev->src_max) - 1); 1410 if (len < 0) 1411 return len; 1412 1413 if (copy_from_user(buf, &user_buffer[i], len)) 1414 return -EFAULT; 1415 buf[len] = 0; 1416 if (strcmp(buf, pkt_dev->src_max) != 0) { 1417 memset(pkt_dev->src_max, 0, sizeof(pkt_dev->src_max)); 1418 strcpy(pkt_dev->src_max, buf); 1419 pkt_dev->saddr_max = in_aton(pkt_dev->src_max); 1420 pkt_dev->cur_saddr = pkt_dev->saddr_max; 1421 } 1422 if (debug) 1423 pr_debug("src_max set to: %s\n", pkt_dev->src_max); 1424 i += len; 1425 sprintf(pg_result, "OK: src_max=%s", pkt_dev->src_max); 1426 return count; 1427 } 1428 if (!strcmp(name, "dst_mac")) { 1429 len = strn_len(&user_buffer[i], sizeof(valstr) - 1); 1430 if (len < 0) 1431 return len; 1432 1433 memset(valstr, 0, sizeof(valstr)); 1434 if (copy_from_user(valstr, &user_buffer[i], len)) 1435 return -EFAULT; 1436 1437 if (!mac_pton(valstr, pkt_dev->dst_mac)) 1438 return -EINVAL; 1439 /* Set up Dest MAC */ 1440 ether_addr_copy(&pkt_dev->hh[0], pkt_dev->dst_mac); 1441 1442 sprintf(pg_result, "OK: dstmac %pM", pkt_dev->dst_mac); 1443 return count; 1444 } 1445 if (!strcmp(name, "src_mac")) { 1446 len = strn_len(&user_buffer[i], sizeof(valstr) - 1); 1447 if (len < 0) 1448 return len; 1449 1450 memset(valstr, 0, sizeof(valstr)); 1451 if (copy_from_user(valstr, &user_buffer[i], len)) 1452 return -EFAULT; 1453 1454 if (!mac_pton(valstr, pkt_dev->src_mac)) 1455 return -EINVAL; 1456 /* Set up Src MAC */ 1457 ether_addr_copy(&pkt_dev->hh[6], pkt_dev->src_mac); 1458 1459 sprintf(pg_result, "OK: srcmac %pM", pkt_dev->src_mac); 1460 return count; 1461 } 1462 1463 if (!strcmp(name, "clear_counters")) { 1464 pktgen_clear_counters(pkt_dev); 1465 sprintf(pg_result, "OK: Clearing counters.\n"); 1466 return count; 1467 } 1468 1469 if (!strcmp(name, "flows")) { 1470 len = num_arg(&user_buffer[i], 10, &value); 1471 if (len < 0) 1472 return len; 1473 1474 i += len; 1475 if (value > MAX_CFLOWS) 1476 value = MAX_CFLOWS; 1477 1478 pkt_dev->cflows = value; 1479 sprintf(pg_result, "OK: flows=%u", pkt_dev->cflows); 1480 return count; 1481 } 1482 #ifdef CONFIG_XFRM 1483 if (!strcmp(name, "spi")) { 1484 len = num_arg(&user_buffer[i], 10, &value); 1485 if (len < 0) 1486 return len; 1487 1488 i += len; 1489 pkt_dev->spi = value; 1490 sprintf(pg_result, "OK: spi=%u", pkt_dev->spi); 1491 return count; 1492 } 1493 #endif 1494 if (!strcmp(name, "flowlen")) { 1495 len = num_arg(&user_buffer[i], 10, &value); 1496 if (len < 0) 1497 return len; 1498 1499 i += len; 1500 pkt_dev->lflow = value; 1501 sprintf(pg_result, "OK: flowlen=%u", pkt_dev->lflow); 1502 return count; 1503 } 1504 1505 if (!strcmp(name, "queue_map_min")) { 1506 len = num_arg(&user_buffer[i], 5, &value); 1507 if (len < 0) 1508 return len; 1509 1510 i += len; 1511 pkt_dev->queue_map_min = value; 1512 sprintf(pg_result, "OK: queue_map_min=%u", pkt_dev->queue_map_min); 1513 return count; 1514 } 1515 1516 if (!strcmp(name, "queue_map_max")) { 1517 len = num_arg(&user_buffer[i], 5, &value); 1518 if (len < 0) 1519 return len; 1520 1521 i += len; 1522 pkt_dev->queue_map_max = value; 1523 sprintf(pg_result, "OK: queue_map_max=%u", pkt_dev->queue_map_max); 1524 return count; 1525 } 1526 1527 if (!strcmp(name, "mpls")) { 1528 unsigned int n, cnt; 1529 1530 len = get_labels(&user_buffer[i], pkt_dev); 1531 if (len < 0) 1532 return len; 1533 i += len; 1534 cnt = sprintf(pg_result, "OK: mpls="); 1535 for (n = 0; n < pkt_dev->nr_labels; n++) 1536 cnt += sprintf(pg_result + cnt, 1537 "%08x%s", ntohl(pkt_dev->labels[n]), 1538 n == pkt_dev->nr_labels-1 ? "" : ","); 1539 1540 if (pkt_dev->nr_labels && pkt_dev->vlan_id != 0xffff) { 1541 pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */ 1542 pkt_dev->svlan_id = 0xffff; 1543 1544 if (debug) 1545 pr_debug("VLAN/SVLAN auto turned off\n"); 1546 } 1547 return count; 1548 } 1549 1550 if (!strcmp(name, "vlan_id")) { 1551 len = num_arg(&user_buffer[i], 4, &value); 1552 if (len < 0) 1553 return len; 1554 1555 i += len; 1556 if (value <= 4095) { 1557 pkt_dev->vlan_id = value; /* turn on VLAN */ 1558 1559 if (debug) 1560 pr_debug("VLAN turned on\n"); 1561 1562 if (debug && pkt_dev->nr_labels) 1563 pr_debug("MPLS auto turned off\n"); 1564 1565 pkt_dev->nr_labels = 0; /* turn off MPLS */ 1566 sprintf(pg_result, "OK: vlan_id=%u", pkt_dev->vlan_id); 1567 } else { 1568 pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */ 1569 pkt_dev->svlan_id = 0xffff; 1570 1571 if (debug) 1572 pr_debug("VLAN/SVLAN turned off\n"); 1573 } 1574 return count; 1575 } 1576 1577 if (!strcmp(name, "vlan_p")) { 1578 len = num_arg(&user_buffer[i], 1, &value); 1579 if (len < 0) 1580 return len; 1581 1582 i += len; 1583 if ((value <= 7) && (pkt_dev->vlan_id != 0xffff)) { 1584 pkt_dev->vlan_p = value; 1585 sprintf(pg_result, "OK: vlan_p=%u", pkt_dev->vlan_p); 1586 } else { 1587 sprintf(pg_result, "ERROR: vlan_p must be 0-7"); 1588 } 1589 return count; 1590 } 1591 1592 if (!strcmp(name, "vlan_cfi")) { 1593 len = num_arg(&user_buffer[i], 1, &value); 1594 if (len < 0) 1595 return len; 1596 1597 i += len; 1598 if ((value <= 1) && (pkt_dev->vlan_id != 0xffff)) { 1599 pkt_dev->vlan_cfi = value; 1600 sprintf(pg_result, "OK: vlan_cfi=%u", pkt_dev->vlan_cfi); 1601 } else { 1602 sprintf(pg_result, "ERROR: vlan_cfi must be 0-1"); 1603 } 1604 return count; 1605 } 1606 1607 if (!strcmp(name, "svlan_id")) { 1608 len = num_arg(&user_buffer[i], 4, &value); 1609 if (len < 0) 1610 return len; 1611 1612 i += len; 1613 if ((value <= 4095) && ((pkt_dev->vlan_id != 0xffff))) { 1614 pkt_dev->svlan_id = value; /* turn on SVLAN */ 1615 1616 if (debug) 1617 pr_debug("SVLAN turned on\n"); 1618 1619 if (debug && pkt_dev->nr_labels) 1620 pr_debug("MPLS auto turned off\n"); 1621 1622 pkt_dev->nr_labels = 0; /* turn off MPLS */ 1623 sprintf(pg_result, "OK: svlan_id=%u", pkt_dev->svlan_id); 1624 } else { 1625 pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */ 1626 pkt_dev->svlan_id = 0xffff; 1627 1628 if (debug) 1629 pr_debug("VLAN/SVLAN turned off\n"); 1630 } 1631 return count; 1632 } 1633 1634 if (!strcmp(name, "svlan_p")) { 1635 len = num_arg(&user_buffer[i], 1, &value); 1636 if (len < 0) 1637 return len; 1638 1639 i += len; 1640 if ((value <= 7) && (pkt_dev->svlan_id != 0xffff)) { 1641 pkt_dev->svlan_p = value; 1642 sprintf(pg_result, "OK: svlan_p=%u", pkt_dev->svlan_p); 1643 } else { 1644 sprintf(pg_result, "ERROR: svlan_p must be 0-7"); 1645 } 1646 return count; 1647 } 1648 1649 if (!strcmp(name, "svlan_cfi")) { 1650 len = num_arg(&user_buffer[i], 1, &value); 1651 if (len < 0) 1652 return len; 1653 1654 i += len; 1655 if ((value <= 1) && (pkt_dev->svlan_id != 0xffff)) { 1656 pkt_dev->svlan_cfi = value; 1657 sprintf(pg_result, "OK: svlan_cfi=%u", pkt_dev->svlan_cfi); 1658 } else { 1659 sprintf(pg_result, "ERROR: svlan_cfi must be 0-1"); 1660 } 1661 return count; 1662 } 1663 1664 if (!strcmp(name, "tos")) { 1665 __u32 tmp_value = 0; 1666 len = hex32_arg(&user_buffer[i], 2, &tmp_value); 1667 if (len < 0) 1668 return len; 1669 1670 i += len; 1671 if (len == 2) { 1672 pkt_dev->tos = tmp_value; 1673 sprintf(pg_result, "OK: tos=0x%02x", pkt_dev->tos); 1674 } else { 1675 sprintf(pg_result, "ERROR: tos must be 00-ff"); 1676 } 1677 return count; 1678 } 1679 1680 if (!strcmp(name, "traffic_class")) { 1681 __u32 tmp_value = 0; 1682 len = hex32_arg(&user_buffer[i], 2, &tmp_value); 1683 if (len < 0) 1684 return len; 1685 1686 i += len; 1687 if (len == 2) { 1688 pkt_dev->traffic_class = tmp_value; 1689 sprintf(pg_result, "OK: traffic_class=0x%02x", pkt_dev->traffic_class); 1690 } else { 1691 sprintf(pg_result, "ERROR: traffic_class must be 00-ff"); 1692 } 1693 return count; 1694 } 1695 1696 if (!strcmp(name, "skb_priority")) { 1697 len = num_arg(&user_buffer[i], 9, &value); 1698 if (len < 0) 1699 return len; 1700 1701 i += len; 1702 pkt_dev->skb_priority = value; 1703 sprintf(pg_result, "OK: skb_priority=%i", 1704 pkt_dev->skb_priority); 1705 return count; 1706 } 1707 1708 sprintf(pkt_dev->result, "No such parameter \"%s\"", name); 1709 return -EINVAL; 1710 } 1711 1712 static int pktgen_if_open(struct inode *inode, struct file *file) 1713 { 1714 return single_open(file, pktgen_if_show, PDE_DATA(inode)); 1715 } 1716 1717 static const struct file_operations pktgen_if_fops = { 1718 .open = pktgen_if_open, 1719 .read = seq_read, 1720 .llseek = seq_lseek, 1721 .write = pktgen_if_write, 1722 .release = single_release, 1723 }; 1724 1725 static int pktgen_thread_show(struct seq_file *seq, void *v) 1726 { 1727 struct pktgen_thread *t = seq->private; 1728 const struct pktgen_dev *pkt_dev; 1729 1730 BUG_ON(!t); 1731 1732 seq_puts(seq, "Running: "); 1733 1734 rcu_read_lock(); 1735 list_for_each_entry_rcu(pkt_dev, &t->if_list, list) 1736 if (pkt_dev->running) 1737 seq_printf(seq, "%s ", pkt_dev->odevname); 1738 1739 seq_puts(seq, "\nStopped: "); 1740 1741 list_for_each_entry_rcu(pkt_dev, &t->if_list, list) 1742 if (!pkt_dev->running) 1743 seq_printf(seq, "%s ", pkt_dev->odevname); 1744 1745 if (t->result[0]) 1746 seq_printf(seq, "\nResult: %s\n", t->result); 1747 else 1748 seq_puts(seq, "\nResult: NA\n"); 1749 1750 rcu_read_unlock(); 1751 1752 return 0; 1753 } 1754 1755 static ssize_t pktgen_thread_write(struct file *file, 1756 const char __user * user_buffer, 1757 size_t count, loff_t * offset) 1758 { 1759 struct seq_file *seq = file->private_data; 1760 struct pktgen_thread *t = seq->private; 1761 int i, max, len, ret; 1762 char name[40]; 1763 char *pg_result; 1764 1765 if (count < 1) { 1766 // sprintf(pg_result, "Wrong command format"); 1767 return -EINVAL; 1768 } 1769 1770 max = count; 1771 len = count_trail_chars(user_buffer, max); 1772 if (len < 0) 1773 return len; 1774 1775 i = len; 1776 1777 /* Read variable name */ 1778 1779 len = strn_len(&user_buffer[i], sizeof(name) - 1); 1780 if (len < 0) 1781 return len; 1782 1783 memset(name, 0, sizeof(name)); 1784 if (copy_from_user(name, &user_buffer[i], len)) 1785 return -EFAULT; 1786 i += len; 1787 1788 max = count - i; 1789 len = count_trail_chars(&user_buffer[i], max); 1790 if (len < 0) 1791 return len; 1792 1793 i += len; 1794 1795 if (debug) 1796 pr_debug("t=%s, count=%lu\n", name, (unsigned long)count); 1797 1798 if (!t) { 1799 pr_err("ERROR: No thread\n"); 1800 ret = -EINVAL; 1801 goto out; 1802 } 1803 1804 pg_result = &(t->result[0]); 1805 1806 if (!strcmp(name, "add_device")) { 1807 char f[32]; 1808 memset(f, 0, 32); 1809 len = strn_len(&user_buffer[i], sizeof(f) - 1); 1810 if (len < 0) { 1811 ret = len; 1812 goto out; 1813 } 1814 if (copy_from_user(f, &user_buffer[i], len)) 1815 return -EFAULT; 1816 i += len; 1817 mutex_lock(&pktgen_thread_lock); 1818 ret = pktgen_add_device(t, f); 1819 mutex_unlock(&pktgen_thread_lock); 1820 if (!ret) { 1821 ret = count; 1822 sprintf(pg_result, "OK: add_device=%s", f); 1823 } else 1824 sprintf(pg_result, "ERROR: can not add device %s", f); 1825 goto out; 1826 } 1827 1828 if (!strcmp(name, "rem_device_all")) { 1829 mutex_lock(&pktgen_thread_lock); 1830 t->control |= T_REMDEVALL; 1831 mutex_unlock(&pktgen_thread_lock); 1832 schedule_timeout_interruptible(msecs_to_jiffies(125)); /* Propagate thread->control */ 1833 ret = count; 1834 sprintf(pg_result, "OK: rem_device_all"); 1835 goto out; 1836 } 1837 1838 if (!strcmp(name, "max_before_softirq")) { 1839 sprintf(pg_result, "OK: Note! max_before_softirq is obsoleted -- Do not use"); 1840 ret = count; 1841 goto out; 1842 } 1843 1844 ret = -EINVAL; 1845 out: 1846 return ret; 1847 } 1848 1849 static int pktgen_thread_open(struct inode *inode, struct file *file) 1850 { 1851 return single_open(file, pktgen_thread_show, PDE_DATA(inode)); 1852 } 1853 1854 static const struct file_operations pktgen_thread_fops = { 1855 .open = pktgen_thread_open, 1856 .read = seq_read, 1857 .llseek = seq_lseek, 1858 .write = pktgen_thread_write, 1859 .release = single_release, 1860 }; 1861 1862 /* Think find or remove for NN */ 1863 static struct pktgen_dev *__pktgen_NN_threads(const struct pktgen_net *pn, 1864 const char *ifname, int remove) 1865 { 1866 struct pktgen_thread *t; 1867 struct pktgen_dev *pkt_dev = NULL; 1868 bool exact = (remove == FIND); 1869 1870 list_for_each_entry(t, &pn->pktgen_threads, th_list) { 1871 pkt_dev = pktgen_find_dev(t, ifname, exact); 1872 if (pkt_dev) { 1873 if (remove) { 1874 pkt_dev->removal_mark = 1; 1875 t->control |= T_REMDEV; 1876 } 1877 break; 1878 } 1879 } 1880 return pkt_dev; 1881 } 1882 1883 /* 1884 * mark a device for removal 1885 */ 1886 static void pktgen_mark_device(const struct pktgen_net *pn, const char *ifname) 1887 { 1888 struct pktgen_dev *pkt_dev = NULL; 1889 const int max_tries = 10, msec_per_try = 125; 1890 int i = 0; 1891 1892 mutex_lock(&pktgen_thread_lock); 1893 pr_debug("%s: marking %s for removal\n", __func__, ifname); 1894 1895 while (1) { 1896 1897 pkt_dev = __pktgen_NN_threads(pn, ifname, REMOVE); 1898 if (pkt_dev == NULL) 1899 break; /* success */ 1900 1901 mutex_unlock(&pktgen_thread_lock); 1902 pr_debug("%s: waiting for %s to disappear....\n", 1903 __func__, ifname); 1904 schedule_timeout_interruptible(msecs_to_jiffies(msec_per_try)); 1905 mutex_lock(&pktgen_thread_lock); 1906 1907 if (++i >= max_tries) { 1908 pr_err("%s: timed out after waiting %d msec for device %s to be removed\n", 1909 __func__, msec_per_try * i, ifname); 1910 break; 1911 } 1912 1913 } 1914 1915 mutex_unlock(&pktgen_thread_lock); 1916 } 1917 1918 static void pktgen_change_name(const struct pktgen_net *pn, struct net_device *dev) 1919 { 1920 struct pktgen_thread *t; 1921 1922 mutex_lock(&pktgen_thread_lock); 1923 1924 list_for_each_entry(t, &pn->pktgen_threads, th_list) { 1925 struct pktgen_dev *pkt_dev; 1926 1927 if_lock(t); 1928 list_for_each_entry(pkt_dev, &t->if_list, list) { 1929 if (pkt_dev->odev != dev) 1930 continue; 1931 1932 proc_remove(pkt_dev->entry); 1933 1934 pkt_dev->entry = proc_create_data(dev->name, 0600, 1935 pn->proc_dir, 1936 &pktgen_if_fops, 1937 pkt_dev); 1938 if (!pkt_dev->entry) 1939 pr_err("can't move proc entry for '%s'\n", 1940 dev->name); 1941 break; 1942 } 1943 if_unlock(t); 1944 } 1945 mutex_unlock(&pktgen_thread_lock); 1946 } 1947 1948 static int pktgen_device_event(struct notifier_block *unused, 1949 unsigned long event, void *ptr) 1950 { 1951 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1952 struct pktgen_net *pn = net_generic(dev_net(dev), pg_net_id); 1953 1954 if (pn->pktgen_exiting) 1955 return NOTIFY_DONE; 1956 1957 /* It is OK that we do not hold the group lock right now, 1958 * as we run under the RTNL lock. 1959 */ 1960 1961 switch (event) { 1962 case NETDEV_CHANGENAME: 1963 pktgen_change_name(pn, dev); 1964 break; 1965 1966 case NETDEV_UNREGISTER: 1967 pktgen_mark_device(pn, dev->name); 1968 break; 1969 } 1970 1971 return NOTIFY_DONE; 1972 } 1973 1974 static struct net_device *pktgen_dev_get_by_name(const struct pktgen_net *pn, 1975 struct pktgen_dev *pkt_dev, 1976 const char *ifname) 1977 { 1978 char b[IFNAMSIZ+5]; 1979 int i; 1980 1981 for (i = 0; ifname[i] != '@'; i++) { 1982 if (i == IFNAMSIZ) 1983 break; 1984 1985 b[i] = ifname[i]; 1986 } 1987 b[i] = 0; 1988 1989 return dev_get_by_name(pn->net, b); 1990 } 1991 1992 1993 /* Associate pktgen_dev with a device. */ 1994 1995 static int pktgen_setup_dev(const struct pktgen_net *pn, 1996 struct pktgen_dev *pkt_dev, const char *ifname) 1997 { 1998 struct net_device *odev; 1999 int err; 2000 2001 /* Clean old setups */ 2002 if (pkt_dev->odev) { 2003 dev_put(pkt_dev->odev); 2004 pkt_dev->odev = NULL; 2005 } 2006 2007 odev = pktgen_dev_get_by_name(pn, pkt_dev, ifname); 2008 if (!odev) { 2009 pr_err("no such netdevice: \"%s\"\n", ifname); 2010 return -ENODEV; 2011 } 2012 2013 if (odev->type != ARPHRD_ETHER) { 2014 pr_err("not an ethernet device: \"%s\"\n", ifname); 2015 err = -EINVAL; 2016 } else if (!netif_running(odev)) { 2017 pr_err("device is down: \"%s\"\n", ifname); 2018 err = -ENETDOWN; 2019 } else { 2020 pkt_dev->odev = odev; 2021 return 0; 2022 } 2023 2024 dev_put(odev); 2025 return err; 2026 } 2027 2028 /* Read pkt_dev from the interface and set up internal pktgen_dev 2029 * structure to have the right information to create/send packets 2030 */ 2031 static void pktgen_setup_inject(struct pktgen_dev *pkt_dev) 2032 { 2033 int ntxq; 2034 2035 if (!pkt_dev->odev) { 2036 pr_err("ERROR: pkt_dev->odev == NULL in setup_inject\n"); 2037 sprintf(pkt_dev->result, 2038 "ERROR: pkt_dev->odev == NULL in setup_inject.\n"); 2039 return; 2040 } 2041 2042 /* make sure that we don't pick a non-existing transmit queue */ 2043 ntxq = pkt_dev->odev->real_num_tx_queues; 2044 2045 if (ntxq <= pkt_dev->queue_map_min) { 2046 pr_warn("WARNING: Requested queue_map_min (zero-based) (%d) exceeds valid range [0 - %d] for (%d) queues on %s, resetting\n", 2047 pkt_dev->queue_map_min, (ntxq ?: 1) - 1, ntxq, 2048 pkt_dev->odevname); 2049 pkt_dev->queue_map_min = (ntxq ?: 1) - 1; 2050 } 2051 if (pkt_dev->queue_map_max >= ntxq) { 2052 pr_warn("WARNING: Requested queue_map_max (zero-based) (%d) exceeds valid range [0 - %d] for (%d) queues on %s, resetting\n", 2053 pkt_dev->queue_map_max, (ntxq ?: 1) - 1, ntxq, 2054 pkt_dev->odevname); 2055 pkt_dev->queue_map_max = (ntxq ?: 1) - 1; 2056 } 2057 2058 /* Default to the interface's mac if not explicitly set. */ 2059 2060 if (is_zero_ether_addr(pkt_dev->src_mac)) 2061 ether_addr_copy(&(pkt_dev->hh[6]), pkt_dev->odev->dev_addr); 2062 2063 /* Set up Dest MAC */ 2064 ether_addr_copy(&(pkt_dev->hh[0]), pkt_dev->dst_mac); 2065 2066 if (pkt_dev->flags & F_IPV6) { 2067 int i, set = 0, err = 1; 2068 struct inet6_dev *idev; 2069 2070 if (pkt_dev->min_pkt_size == 0) { 2071 pkt_dev->min_pkt_size = 14 + sizeof(struct ipv6hdr) 2072 + sizeof(struct udphdr) 2073 + sizeof(struct pktgen_hdr) 2074 + pkt_dev->pkt_overhead; 2075 } 2076 2077 for (i = 0; i < sizeof(struct in6_addr); i++) 2078 if (pkt_dev->cur_in6_saddr.s6_addr[i]) { 2079 set = 1; 2080 break; 2081 } 2082 2083 if (!set) { 2084 2085 /* 2086 * Use linklevel address if unconfigured. 2087 * 2088 * use ipv6_get_lladdr if/when it's get exported 2089 */ 2090 2091 rcu_read_lock(); 2092 idev = __in6_dev_get(pkt_dev->odev); 2093 if (idev) { 2094 struct inet6_ifaddr *ifp; 2095 2096 read_lock_bh(&idev->lock); 2097 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2098 if ((ifp->scope & IFA_LINK) && 2099 !(ifp->flags & IFA_F_TENTATIVE)) { 2100 pkt_dev->cur_in6_saddr = ifp->addr; 2101 err = 0; 2102 break; 2103 } 2104 } 2105 read_unlock_bh(&idev->lock); 2106 } 2107 rcu_read_unlock(); 2108 if (err) 2109 pr_err("ERROR: IPv6 link address not available\n"); 2110 } 2111 } else { 2112 if (pkt_dev->min_pkt_size == 0) { 2113 pkt_dev->min_pkt_size = 14 + sizeof(struct iphdr) 2114 + sizeof(struct udphdr) 2115 + sizeof(struct pktgen_hdr) 2116 + pkt_dev->pkt_overhead; 2117 } 2118 2119 pkt_dev->saddr_min = 0; 2120 pkt_dev->saddr_max = 0; 2121 if (strlen(pkt_dev->src_min) == 0) { 2122 2123 struct in_device *in_dev; 2124 2125 rcu_read_lock(); 2126 in_dev = __in_dev_get_rcu(pkt_dev->odev); 2127 if (in_dev) { 2128 const struct in_ifaddr *ifa; 2129 2130 ifa = rcu_dereference(in_dev->ifa_list); 2131 if (ifa) { 2132 pkt_dev->saddr_min = ifa->ifa_address; 2133 pkt_dev->saddr_max = pkt_dev->saddr_min; 2134 } 2135 } 2136 rcu_read_unlock(); 2137 } else { 2138 pkt_dev->saddr_min = in_aton(pkt_dev->src_min); 2139 pkt_dev->saddr_max = in_aton(pkt_dev->src_max); 2140 } 2141 2142 pkt_dev->daddr_min = in_aton(pkt_dev->dst_min); 2143 pkt_dev->daddr_max = in_aton(pkt_dev->dst_max); 2144 } 2145 /* Initialize current values. */ 2146 pkt_dev->cur_pkt_size = pkt_dev->min_pkt_size; 2147 if (pkt_dev->min_pkt_size > pkt_dev->max_pkt_size) 2148 pkt_dev->max_pkt_size = pkt_dev->min_pkt_size; 2149 2150 pkt_dev->cur_dst_mac_offset = 0; 2151 pkt_dev->cur_src_mac_offset = 0; 2152 pkt_dev->cur_saddr = pkt_dev->saddr_min; 2153 pkt_dev->cur_daddr = pkt_dev->daddr_min; 2154 pkt_dev->cur_udp_dst = pkt_dev->udp_dst_min; 2155 pkt_dev->cur_udp_src = pkt_dev->udp_src_min; 2156 pkt_dev->nflows = 0; 2157 } 2158 2159 2160 static void spin(struct pktgen_dev *pkt_dev, ktime_t spin_until) 2161 { 2162 ktime_t start_time, end_time; 2163 s64 remaining; 2164 struct hrtimer_sleeper t; 2165 2166 hrtimer_init_on_stack(&t.timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); 2167 hrtimer_set_expires(&t.timer, spin_until); 2168 2169 remaining = ktime_to_ns(hrtimer_expires_remaining(&t.timer)); 2170 if (remaining <= 0) 2171 goto out; 2172 2173 start_time = ktime_get(); 2174 if (remaining < 100000) { 2175 /* for small delays (<100us), just loop until limit is reached */ 2176 do { 2177 end_time = ktime_get(); 2178 } while (ktime_compare(end_time, spin_until) < 0); 2179 } else { 2180 /* see do_nanosleep */ 2181 hrtimer_init_sleeper(&t, current); 2182 do { 2183 set_current_state(TASK_INTERRUPTIBLE); 2184 hrtimer_start_expires(&t.timer, HRTIMER_MODE_ABS); 2185 2186 if (likely(t.task)) 2187 schedule(); 2188 2189 hrtimer_cancel(&t.timer); 2190 } while (t.task && pkt_dev->running && !signal_pending(current)); 2191 __set_current_state(TASK_RUNNING); 2192 end_time = ktime_get(); 2193 } 2194 2195 pkt_dev->idle_acc += ktime_to_ns(ktime_sub(end_time, start_time)); 2196 out: 2197 pkt_dev->next_tx = ktime_add_ns(spin_until, pkt_dev->delay); 2198 destroy_hrtimer_on_stack(&t.timer); 2199 } 2200 2201 static inline void set_pkt_overhead(struct pktgen_dev *pkt_dev) 2202 { 2203 pkt_dev->pkt_overhead = 0; 2204 pkt_dev->pkt_overhead += pkt_dev->nr_labels*sizeof(u32); 2205 pkt_dev->pkt_overhead += VLAN_TAG_SIZE(pkt_dev); 2206 pkt_dev->pkt_overhead += SVLAN_TAG_SIZE(pkt_dev); 2207 } 2208 2209 static inline int f_seen(const struct pktgen_dev *pkt_dev, int flow) 2210 { 2211 return !!(pkt_dev->flows[flow].flags & F_INIT); 2212 } 2213 2214 static inline int f_pick(struct pktgen_dev *pkt_dev) 2215 { 2216 int flow = pkt_dev->curfl; 2217 2218 if (pkt_dev->flags & F_FLOW_SEQ) { 2219 if (pkt_dev->flows[flow].count >= pkt_dev->lflow) { 2220 /* reset time */ 2221 pkt_dev->flows[flow].count = 0; 2222 pkt_dev->flows[flow].flags = 0; 2223 pkt_dev->curfl += 1; 2224 if (pkt_dev->curfl >= pkt_dev->cflows) 2225 pkt_dev->curfl = 0; /*reset */ 2226 } 2227 } else { 2228 flow = prandom_u32() % pkt_dev->cflows; 2229 pkt_dev->curfl = flow; 2230 2231 if (pkt_dev->flows[flow].count > pkt_dev->lflow) { 2232 pkt_dev->flows[flow].count = 0; 2233 pkt_dev->flows[flow].flags = 0; 2234 } 2235 } 2236 2237 return pkt_dev->curfl; 2238 } 2239 2240 2241 #ifdef CONFIG_XFRM 2242 /* If there was already an IPSEC SA, we keep it as is, else 2243 * we go look for it ... 2244 */ 2245 #define DUMMY_MARK 0 2246 static void get_ipsec_sa(struct pktgen_dev *pkt_dev, int flow) 2247 { 2248 struct xfrm_state *x = pkt_dev->flows[flow].x; 2249 struct pktgen_net *pn = net_generic(dev_net(pkt_dev->odev), pg_net_id); 2250 if (!x) { 2251 2252 if (pkt_dev->spi) { 2253 /* We need as quick as possible to find the right SA 2254 * Searching with minimum criteria to archieve this. 2255 */ 2256 x = xfrm_state_lookup_byspi(pn->net, htonl(pkt_dev->spi), AF_INET); 2257 } else { 2258 /* slow path: we dont already have xfrm_state */ 2259 x = xfrm_stateonly_find(pn->net, DUMMY_MARK, 0, 2260 (xfrm_address_t *)&pkt_dev->cur_daddr, 2261 (xfrm_address_t *)&pkt_dev->cur_saddr, 2262 AF_INET, 2263 pkt_dev->ipsmode, 2264 pkt_dev->ipsproto, 0); 2265 } 2266 if (x) { 2267 pkt_dev->flows[flow].x = x; 2268 set_pkt_overhead(pkt_dev); 2269 pkt_dev->pkt_overhead += x->props.header_len; 2270 } 2271 2272 } 2273 } 2274 #endif 2275 static void set_cur_queue_map(struct pktgen_dev *pkt_dev) 2276 { 2277 2278 if (pkt_dev->flags & F_QUEUE_MAP_CPU) 2279 pkt_dev->cur_queue_map = smp_processor_id(); 2280 2281 else if (pkt_dev->queue_map_min <= pkt_dev->queue_map_max) { 2282 __u16 t; 2283 if (pkt_dev->flags & F_QUEUE_MAP_RND) { 2284 t = prandom_u32() % 2285 (pkt_dev->queue_map_max - 2286 pkt_dev->queue_map_min + 1) 2287 + pkt_dev->queue_map_min; 2288 } else { 2289 t = pkt_dev->cur_queue_map + 1; 2290 if (t > pkt_dev->queue_map_max) 2291 t = pkt_dev->queue_map_min; 2292 } 2293 pkt_dev->cur_queue_map = t; 2294 } 2295 pkt_dev->cur_queue_map = pkt_dev->cur_queue_map % pkt_dev->odev->real_num_tx_queues; 2296 } 2297 2298 /* Increment/randomize headers according to flags and current values 2299 * for IP src/dest, UDP src/dst port, MAC-Addr src/dst 2300 */ 2301 static void mod_cur_headers(struct pktgen_dev *pkt_dev) 2302 { 2303 __u32 imn; 2304 __u32 imx; 2305 int flow = 0; 2306 2307 if (pkt_dev->cflows) 2308 flow = f_pick(pkt_dev); 2309 2310 /* Deal with source MAC */ 2311 if (pkt_dev->src_mac_count > 1) { 2312 __u32 mc; 2313 __u32 tmp; 2314 2315 if (pkt_dev->flags & F_MACSRC_RND) 2316 mc = prandom_u32() % pkt_dev->src_mac_count; 2317 else { 2318 mc = pkt_dev->cur_src_mac_offset++; 2319 if (pkt_dev->cur_src_mac_offset >= 2320 pkt_dev->src_mac_count) 2321 pkt_dev->cur_src_mac_offset = 0; 2322 } 2323 2324 tmp = pkt_dev->src_mac[5] + (mc & 0xFF); 2325 pkt_dev->hh[11] = tmp; 2326 tmp = (pkt_dev->src_mac[4] + ((mc >> 8) & 0xFF) + (tmp >> 8)); 2327 pkt_dev->hh[10] = tmp; 2328 tmp = (pkt_dev->src_mac[3] + ((mc >> 16) & 0xFF) + (tmp >> 8)); 2329 pkt_dev->hh[9] = tmp; 2330 tmp = (pkt_dev->src_mac[2] + ((mc >> 24) & 0xFF) + (tmp >> 8)); 2331 pkt_dev->hh[8] = tmp; 2332 tmp = (pkt_dev->src_mac[1] + (tmp >> 8)); 2333 pkt_dev->hh[7] = tmp; 2334 } 2335 2336 /* Deal with Destination MAC */ 2337 if (pkt_dev->dst_mac_count > 1) { 2338 __u32 mc; 2339 __u32 tmp; 2340 2341 if (pkt_dev->flags & F_MACDST_RND) 2342 mc = prandom_u32() % pkt_dev->dst_mac_count; 2343 2344 else { 2345 mc = pkt_dev->cur_dst_mac_offset++; 2346 if (pkt_dev->cur_dst_mac_offset >= 2347 pkt_dev->dst_mac_count) { 2348 pkt_dev->cur_dst_mac_offset = 0; 2349 } 2350 } 2351 2352 tmp = pkt_dev->dst_mac[5] + (mc & 0xFF); 2353 pkt_dev->hh[5] = tmp; 2354 tmp = (pkt_dev->dst_mac[4] + ((mc >> 8) & 0xFF) + (tmp >> 8)); 2355 pkt_dev->hh[4] = tmp; 2356 tmp = (pkt_dev->dst_mac[3] + ((mc >> 16) & 0xFF) + (tmp >> 8)); 2357 pkt_dev->hh[3] = tmp; 2358 tmp = (pkt_dev->dst_mac[2] + ((mc >> 24) & 0xFF) + (tmp >> 8)); 2359 pkt_dev->hh[2] = tmp; 2360 tmp = (pkt_dev->dst_mac[1] + (tmp >> 8)); 2361 pkt_dev->hh[1] = tmp; 2362 } 2363 2364 if (pkt_dev->flags & F_MPLS_RND) { 2365 unsigned int i; 2366 for (i = 0; i < pkt_dev->nr_labels; i++) 2367 if (pkt_dev->labels[i] & MPLS_STACK_BOTTOM) 2368 pkt_dev->labels[i] = MPLS_STACK_BOTTOM | 2369 ((__force __be32)prandom_u32() & 2370 htonl(0x000fffff)); 2371 } 2372 2373 if ((pkt_dev->flags & F_VID_RND) && (pkt_dev->vlan_id != 0xffff)) { 2374 pkt_dev->vlan_id = prandom_u32() & (4096 - 1); 2375 } 2376 2377 if ((pkt_dev->flags & F_SVID_RND) && (pkt_dev->svlan_id != 0xffff)) { 2378 pkt_dev->svlan_id = prandom_u32() & (4096 - 1); 2379 } 2380 2381 if (pkt_dev->udp_src_min < pkt_dev->udp_src_max) { 2382 if (pkt_dev->flags & F_UDPSRC_RND) 2383 pkt_dev->cur_udp_src = prandom_u32() % 2384 (pkt_dev->udp_src_max - pkt_dev->udp_src_min) 2385 + pkt_dev->udp_src_min; 2386 2387 else { 2388 pkt_dev->cur_udp_src++; 2389 if (pkt_dev->cur_udp_src >= pkt_dev->udp_src_max) 2390 pkt_dev->cur_udp_src = pkt_dev->udp_src_min; 2391 } 2392 } 2393 2394 if (pkt_dev->udp_dst_min < pkt_dev->udp_dst_max) { 2395 if (pkt_dev->flags & F_UDPDST_RND) { 2396 pkt_dev->cur_udp_dst = prandom_u32() % 2397 (pkt_dev->udp_dst_max - pkt_dev->udp_dst_min) 2398 + pkt_dev->udp_dst_min; 2399 } else { 2400 pkt_dev->cur_udp_dst++; 2401 if (pkt_dev->cur_udp_dst >= pkt_dev->udp_dst_max) 2402 pkt_dev->cur_udp_dst = pkt_dev->udp_dst_min; 2403 } 2404 } 2405 2406 if (!(pkt_dev->flags & F_IPV6)) { 2407 2408 imn = ntohl(pkt_dev->saddr_min); 2409 imx = ntohl(pkt_dev->saddr_max); 2410 if (imn < imx) { 2411 __u32 t; 2412 if (pkt_dev->flags & F_IPSRC_RND) 2413 t = prandom_u32() % (imx - imn) + imn; 2414 else { 2415 t = ntohl(pkt_dev->cur_saddr); 2416 t++; 2417 if (t > imx) 2418 t = imn; 2419 2420 } 2421 pkt_dev->cur_saddr = htonl(t); 2422 } 2423 2424 if (pkt_dev->cflows && f_seen(pkt_dev, flow)) { 2425 pkt_dev->cur_daddr = pkt_dev->flows[flow].cur_daddr; 2426 } else { 2427 imn = ntohl(pkt_dev->daddr_min); 2428 imx = ntohl(pkt_dev->daddr_max); 2429 if (imn < imx) { 2430 __u32 t; 2431 __be32 s; 2432 if (pkt_dev->flags & F_IPDST_RND) { 2433 2434 do { 2435 t = prandom_u32() % 2436 (imx - imn) + imn; 2437 s = htonl(t); 2438 } while (ipv4_is_loopback(s) || 2439 ipv4_is_multicast(s) || 2440 ipv4_is_lbcast(s) || 2441 ipv4_is_zeronet(s) || 2442 ipv4_is_local_multicast(s)); 2443 pkt_dev->cur_daddr = s; 2444 } else { 2445 t = ntohl(pkt_dev->cur_daddr); 2446 t++; 2447 if (t > imx) { 2448 t = imn; 2449 } 2450 pkt_dev->cur_daddr = htonl(t); 2451 } 2452 } 2453 if (pkt_dev->cflows) { 2454 pkt_dev->flows[flow].flags |= F_INIT; 2455 pkt_dev->flows[flow].cur_daddr = 2456 pkt_dev->cur_daddr; 2457 #ifdef CONFIG_XFRM 2458 if (pkt_dev->flags & F_IPSEC) 2459 get_ipsec_sa(pkt_dev, flow); 2460 #endif 2461 pkt_dev->nflows++; 2462 } 2463 } 2464 } else { /* IPV6 * */ 2465 2466 if (!ipv6_addr_any(&pkt_dev->min_in6_daddr)) { 2467 int i; 2468 2469 /* Only random destinations yet */ 2470 2471 for (i = 0; i < 4; i++) { 2472 pkt_dev->cur_in6_daddr.s6_addr32[i] = 2473 (((__force __be32)prandom_u32() | 2474 pkt_dev->min_in6_daddr.s6_addr32[i]) & 2475 pkt_dev->max_in6_daddr.s6_addr32[i]); 2476 } 2477 } 2478 } 2479 2480 if (pkt_dev->min_pkt_size < pkt_dev->max_pkt_size) { 2481 __u32 t; 2482 if (pkt_dev->flags & F_TXSIZE_RND) { 2483 t = prandom_u32() % 2484 (pkt_dev->max_pkt_size - pkt_dev->min_pkt_size) 2485 + pkt_dev->min_pkt_size; 2486 } else { 2487 t = pkt_dev->cur_pkt_size + 1; 2488 if (t > pkt_dev->max_pkt_size) 2489 t = pkt_dev->min_pkt_size; 2490 } 2491 pkt_dev->cur_pkt_size = t; 2492 } 2493 2494 set_cur_queue_map(pkt_dev); 2495 2496 pkt_dev->flows[flow].count++; 2497 } 2498 2499 2500 #ifdef CONFIG_XFRM 2501 static u32 pktgen_dst_metrics[RTAX_MAX + 1] = { 2502 2503 [RTAX_HOPLIMIT] = 0x5, /* Set a static hoplimit */ 2504 }; 2505 2506 static int pktgen_output_ipsec(struct sk_buff *skb, struct pktgen_dev *pkt_dev) 2507 { 2508 struct xfrm_state *x = pkt_dev->flows[pkt_dev->curfl].x; 2509 int err = 0; 2510 struct net *net = dev_net(pkt_dev->odev); 2511 2512 if (!x) 2513 return 0; 2514 /* XXX: we dont support tunnel mode for now until 2515 * we resolve the dst issue */ 2516 if ((x->props.mode != XFRM_MODE_TRANSPORT) && (pkt_dev->spi == 0)) 2517 return 0; 2518 2519 /* But when user specify an valid SPI, transformation 2520 * supports both transport/tunnel mode + ESP/AH type. 2521 */ 2522 if ((x->props.mode == XFRM_MODE_TUNNEL) && (pkt_dev->spi != 0)) 2523 skb->_skb_refdst = (unsigned long)&pkt_dev->xdst.u.dst | SKB_DST_NOREF; 2524 2525 rcu_read_lock_bh(); 2526 err = pktgen_xfrm_outer_mode_output(x, skb); 2527 rcu_read_unlock_bh(); 2528 if (err) { 2529 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEMODEERROR); 2530 goto error; 2531 } 2532 err = x->type->output(x, skb); 2533 if (err) { 2534 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEPROTOERROR); 2535 goto error; 2536 } 2537 spin_lock_bh(&x->lock); 2538 x->curlft.bytes += skb->len; 2539 x->curlft.packets++; 2540 spin_unlock_bh(&x->lock); 2541 error: 2542 return err; 2543 } 2544 2545 static void free_SAs(struct pktgen_dev *pkt_dev) 2546 { 2547 if (pkt_dev->cflows) { 2548 /* let go of the SAs if we have them */ 2549 int i; 2550 for (i = 0; i < pkt_dev->cflows; i++) { 2551 struct xfrm_state *x = pkt_dev->flows[i].x; 2552 if (x) { 2553 xfrm_state_put(x); 2554 pkt_dev->flows[i].x = NULL; 2555 } 2556 } 2557 } 2558 } 2559 2560 static int process_ipsec(struct pktgen_dev *pkt_dev, 2561 struct sk_buff *skb, __be16 protocol) 2562 { 2563 if (pkt_dev->flags & F_IPSEC) { 2564 struct xfrm_state *x = pkt_dev->flows[pkt_dev->curfl].x; 2565 int nhead = 0; 2566 if (x) { 2567 struct ethhdr *eth; 2568 struct iphdr *iph; 2569 int ret; 2570 2571 nhead = x->props.header_len - skb_headroom(skb); 2572 if (nhead > 0) { 2573 ret = pskb_expand_head(skb, nhead, 0, GFP_ATOMIC); 2574 if (ret < 0) { 2575 pr_err("Error expanding ipsec packet %d\n", 2576 ret); 2577 goto err; 2578 } 2579 } 2580 2581 /* ipsec is not expecting ll header */ 2582 skb_pull(skb, ETH_HLEN); 2583 ret = pktgen_output_ipsec(skb, pkt_dev); 2584 if (ret) { 2585 pr_err("Error creating ipsec packet %d\n", ret); 2586 goto err; 2587 } 2588 /* restore ll */ 2589 eth = skb_push(skb, ETH_HLEN); 2590 memcpy(eth, pkt_dev->hh, 2 * ETH_ALEN); 2591 eth->h_proto = protocol; 2592 2593 /* Update IPv4 header len as well as checksum value */ 2594 iph = ip_hdr(skb); 2595 iph->tot_len = htons(skb->len - ETH_HLEN); 2596 ip_send_check(iph); 2597 } 2598 } 2599 return 1; 2600 err: 2601 kfree_skb(skb); 2602 return 0; 2603 } 2604 #endif 2605 2606 static void mpls_push(__be32 *mpls, struct pktgen_dev *pkt_dev) 2607 { 2608 unsigned int i; 2609 for (i = 0; i < pkt_dev->nr_labels; i++) 2610 *mpls++ = pkt_dev->labels[i] & ~MPLS_STACK_BOTTOM; 2611 2612 mpls--; 2613 *mpls |= MPLS_STACK_BOTTOM; 2614 } 2615 2616 static inline __be16 build_tci(unsigned int id, unsigned int cfi, 2617 unsigned int prio) 2618 { 2619 return htons(id | (cfi << 12) | (prio << 13)); 2620 } 2621 2622 static void pktgen_finalize_skb(struct pktgen_dev *pkt_dev, struct sk_buff *skb, 2623 int datalen) 2624 { 2625 struct timespec64 timestamp; 2626 struct pktgen_hdr *pgh; 2627 2628 pgh = skb_put(skb, sizeof(*pgh)); 2629 datalen -= sizeof(*pgh); 2630 2631 if (pkt_dev->nfrags <= 0) { 2632 skb_put_zero(skb, datalen); 2633 } else { 2634 int frags = pkt_dev->nfrags; 2635 int i, len; 2636 int frag_len; 2637 2638 2639 if (frags > MAX_SKB_FRAGS) 2640 frags = MAX_SKB_FRAGS; 2641 len = datalen - frags * PAGE_SIZE; 2642 if (len > 0) { 2643 skb_put_zero(skb, len); 2644 datalen = frags * PAGE_SIZE; 2645 } 2646 2647 i = 0; 2648 frag_len = (datalen/frags) < PAGE_SIZE ? 2649 (datalen/frags) : PAGE_SIZE; 2650 while (datalen > 0) { 2651 if (unlikely(!pkt_dev->page)) { 2652 int node = numa_node_id(); 2653 2654 if (pkt_dev->node >= 0 && (pkt_dev->flags & F_NODE)) 2655 node = pkt_dev->node; 2656 pkt_dev->page = alloc_pages_node(node, GFP_KERNEL | __GFP_ZERO, 0); 2657 if (!pkt_dev->page) 2658 break; 2659 } 2660 get_page(pkt_dev->page); 2661 skb_frag_set_page(skb, i, pkt_dev->page); 2662 skb_shinfo(skb)->frags[i].page_offset = 0; 2663 /*last fragment, fill rest of data*/ 2664 if (i == (frags - 1)) 2665 skb_frag_size_set(&skb_shinfo(skb)->frags[i], 2666 (datalen < PAGE_SIZE ? datalen : PAGE_SIZE)); 2667 else 2668 skb_frag_size_set(&skb_shinfo(skb)->frags[i], frag_len); 2669 datalen -= skb_frag_size(&skb_shinfo(skb)->frags[i]); 2670 skb->len += skb_frag_size(&skb_shinfo(skb)->frags[i]); 2671 skb->data_len += skb_frag_size(&skb_shinfo(skb)->frags[i]); 2672 i++; 2673 skb_shinfo(skb)->nr_frags = i; 2674 } 2675 } 2676 2677 /* Stamp the time, and sequence number, 2678 * convert them to network byte order 2679 */ 2680 pgh->pgh_magic = htonl(PKTGEN_MAGIC); 2681 pgh->seq_num = htonl(pkt_dev->seq_num); 2682 2683 if (pkt_dev->flags & F_NO_TIMESTAMP) { 2684 pgh->tv_sec = 0; 2685 pgh->tv_usec = 0; 2686 } else { 2687 /* 2688 * pgh->tv_sec wraps in y2106 when interpreted as unsigned 2689 * as done by wireshark, or y2038 when interpreted as signed. 2690 * This is probably harmless, but if anyone wants to improve 2691 * it, we could introduce a variant that puts 64-bit nanoseconds 2692 * into the respective header bytes. 2693 * This would also be slightly faster to read. 2694 */ 2695 ktime_get_real_ts64(×tamp); 2696 pgh->tv_sec = htonl(timestamp.tv_sec); 2697 pgh->tv_usec = htonl(timestamp.tv_nsec / NSEC_PER_USEC); 2698 } 2699 } 2700 2701 static struct sk_buff *pktgen_alloc_skb(struct net_device *dev, 2702 struct pktgen_dev *pkt_dev) 2703 { 2704 unsigned int extralen = LL_RESERVED_SPACE(dev); 2705 struct sk_buff *skb = NULL; 2706 unsigned int size; 2707 2708 size = pkt_dev->cur_pkt_size + 64 + extralen + pkt_dev->pkt_overhead; 2709 if (pkt_dev->flags & F_NODE) { 2710 int node = pkt_dev->node >= 0 ? pkt_dev->node : numa_node_id(); 2711 2712 skb = __alloc_skb(NET_SKB_PAD + size, GFP_NOWAIT, 0, node); 2713 if (likely(skb)) { 2714 skb_reserve(skb, NET_SKB_PAD); 2715 skb->dev = dev; 2716 } 2717 } else { 2718 skb = __netdev_alloc_skb(dev, size, GFP_NOWAIT); 2719 } 2720 2721 /* the caller pre-fetches from skb->data and reserves for the mac hdr */ 2722 if (likely(skb)) 2723 skb_reserve(skb, extralen - 16); 2724 2725 return skb; 2726 } 2727 2728 static struct sk_buff *fill_packet_ipv4(struct net_device *odev, 2729 struct pktgen_dev *pkt_dev) 2730 { 2731 struct sk_buff *skb = NULL; 2732 __u8 *eth; 2733 struct udphdr *udph; 2734 int datalen, iplen; 2735 struct iphdr *iph; 2736 __be16 protocol = htons(ETH_P_IP); 2737 __be32 *mpls; 2738 __be16 *vlan_tci = NULL; /* Encapsulates priority and VLAN ID */ 2739 __be16 *vlan_encapsulated_proto = NULL; /* packet type ID field (or len) for VLAN tag */ 2740 __be16 *svlan_tci = NULL; /* Encapsulates priority and SVLAN ID */ 2741 __be16 *svlan_encapsulated_proto = NULL; /* packet type ID field (or len) for SVLAN tag */ 2742 u16 queue_map; 2743 2744 if (pkt_dev->nr_labels) 2745 protocol = htons(ETH_P_MPLS_UC); 2746 2747 if (pkt_dev->vlan_id != 0xffff) 2748 protocol = htons(ETH_P_8021Q); 2749 2750 /* Update any of the values, used when we're incrementing various 2751 * fields. 2752 */ 2753 mod_cur_headers(pkt_dev); 2754 queue_map = pkt_dev->cur_queue_map; 2755 2756 skb = pktgen_alloc_skb(odev, pkt_dev); 2757 if (!skb) { 2758 sprintf(pkt_dev->result, "No memory"); 2759 return NULL; 2760 } 2761 2762 prefetchw(skb->data); 2763 skb_reserve(skb, 16); 2764 2765 /* Reserve for ethernet and IP header */ 2766 eth = skb_push(skb, 14); 2767 mpls = skb_put(skb, pkt_dev->nr_labels * sizeof(__u32)); 2768 if (pkt_dev->nr_labels) 2769 mpls_push(mpls, pkt_dev); 2770 2771 if (pkt_dev->vlan_id != 0xffff) { 2772 if (pkt_dev->svlan_id != 0xffff) { 2773 svlan_tci = skb_put(skb, sizeof(__be16)); 2774 *svlan_tci = build_tci(pkt_dev->svlan_id, 2775 pkt_dev->svlan_cfi, 2776 pkt_dev->svlan_p); 2777 svlan_encapsulated_proto = skb_put(skb, 2778 sizeof(__be16)); 2779 *svlan_encapsulated_proto = htons(ETH_P_8021Q); 2780 } 2781 vlan_tci = skb_put(skb, sizeof(__be16)); 2782 *vlan_tci = build_tci(pkt_dev->vlan_id, 2783 pkt_dev->vlan_cfi, 2784 pkt_dev->vlan_p); 2785 vlan_encapsulated_proto = skb_put(skb, sizeof(__be16)); 2786 *vlan_encapsulated_proto = htons(ETH_P_IP); 2787 } 2788 2789 skb_reset_mac_header(skb); 2790 skb_set_network_header(skb, skb->len); 2791 iph = skb_put(skb, sizeof(struct iphdr)); 2792 2793 skb_set_transport_header(skb, skb->len); 2794 udph = skb_put(skb, sizeof(struct udphdr)); 2795 skb_set_queue_mapping(skb, queue_map); 2796 skb->priority = pkt_dev->skb_priority; 2797 2798 memcpy(eth, pkt_dev->hh, 12); 2799 *(__be16 *) & eth[12] = protocol; 2800 2801 /* Eth + IPh + UDPh + mpls */ 2802 datalen = pkt_dev->cur_pkt_size - 14 - 20 - 8 - 2803 pkt_dev->pkt_overhead; 2804 if (datalen < 0 || datalen < sizeof(struct pktgen_hdr)) 2805 datalen = sizeof(struct pktgen_hdr); 2806 2807 udph->source = htons(pkt_dev->cur_udp_src); 2808 udph->dest = htons(pkt_dev->cur_udp_dst); 2809 udph->len = htons(datalen + 8); /* DATA + udphdr */ 2810 udph->check = 0; 2811 2812 iph->ihl = 5; 2813 iph->version = 4; 2814 iph->ttl = 32; 2815 iph->tos = pkt_dev->tos; 2816 iph->protocol = IPPROTO_UDP; /* UDP */ 2817 iph->saddr = pkt_dev->cur_saddr; 2818 iph->daddr = pkt_dev->cur_daddr; 2819 iph->id = htons(pkt_dev->ip_id); 2820 pkt_dev->ip_id++; 2821 iph->frag_off = 0; 2822 iplen = 20 + 8 + datalen; 2823 iph->tot_len = htons(iplen); 2824 ip_send_check(iph); 2825 skb->protocol = protocol; 2826 skb->dev = odev; 2827 skb->pkt_type = PACKET_HOST; 2828 2829 pktgen_finalize_skb(pkt_dev, skb, datalen); 2830 2831 if (!(pkt_dev->flags & F_UDPCSUM)) { 2832 skb->ip_summed = CHECKSUM_NONE; 2833 } else if (odev->features & (NETIF_F_HW_CSUM | NETIF_F_IP_CSUM)) { 2834 skb->ip_summed = CHECKSUM_PARTIAL; 2835 skb->csum = 0; 2836 udp4_hwcsum(skb, iph->saddr, iph->daddr); 2837 } else { 2838 __wsum csum = skb_checksum(skb, skb_transport_offset(skb), datalen + 8, 0); 2839 2840 /* add protocol-dependent pseudo-header */ 2841 udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr, 2842 datalen + 8, IPPROTO_UDP, csum); 2843 2844 if (udph->check == 0) 2845 udph->check = CSUM_MANGLED_0; 2846 } 2847 2848 #ifdef CONFIG_XFRM 2849 if (!process_ipsec(pkt_dev, skb, protocol)) 2850 return NULL; 2851 #endif 2852 2853 return skb; 2854 } 2855 2856 static struct sk_buff *fill_packet_ipv6(struct net_device *odev, 2857 struct pktgen_dev *pkt_dev) 2858 { 2859 struct sk_buff *skb = NULL; 2860 __u8 *eth; 2861 struct udphdr *udph; 2862 int datalen, udplen; 2863 struct ipv6hdr *iph; 2864 __be16 protocol = htons(ETH_P_IPV6); 2865 __be32 *mpls; 2866 __be16 *vlan_tci = NULL; /* Encapsulates priority and VLAN ID */ 2867 __be16 *vlan_encapsulated_proto = NULL; /* packet type ID field (or len) for VLAN tag */ 2868 __be16 *svlan_tci = NULL; /* Encapsulates priority and SVLAN ID */ 2869 __be16 *svlan_encapsulated_proto = NULL; /* packet type ID field (or len) for SVLAN tag */ 2870 u16 queue_map; 2871 2872 if (pkt_dev->nr_labels) 2873 protocol = htons(ETH_P_MPLS_UC); 2874 2875 if (pkt_dev->vlan_id != 0xffff) 2876 protocol = htons(ETH_P_8021Q); 2877 2878 /* Update any of the values, used when we're incrementing various 2879 * fields. 2880 */ 2881 mod_cur_headers(pkt_dev); 2882 queue_map = pkt_dev->cur_queue_map; 2883 2884 skb = pktgen_alloc_skb(odev, pkt_dev); 2885 if (!skb) { 2886 sprintf(pkt_dev->result, "No memory"); 2887 return NULL; 2888 } 2889 2890 prefetchw(skb->data); 2891 skb_reserve(skb, 16); 2892 2893 /* Reserve for ethernet and IP header */ 2894 eth = skb_push(skb, 14); 2895 mpls = skb_put(skb, pkt_dev->nr_labels * sizeof(__u32)); 2896 if (pkt_dev->nr_labels) 2897 mpls_push(mpls, pkt_dev); 2898 2899 if (pkt_dev->vlan_id != 0xffff) { 2900 if (pkt_dev->svlan_id != 0xffff) { 2901 svlan_tci = skb_put(skb, sizeof(__be16)); 2902 *svlan_tci = build_tci(pkt_dev->svlan_id, 2903 pkt_dev->svlan_cfi, 2904 pkt_dev->svlan_p); 2905 svlan_encapsulated_proto = skb_put(skb, 2906 sizeof(__be16)); 2907 *svlan_encapsulated_proto = htons(ETH_P_8021Q); 2908 } 2909 vlan_tci = skb_put(skb, sizeof(__be16)); 2910 *vlan_tci = build_tci(pkt_dev->vlan_id, 2911 pkt_dev->vlan_cfi, 2912 pkt_dev->vlan_p); 2913 vlan_encapsulated_proto = skb_put(skb, sizeof(__be16)); 2914 *vlan_encapsulated_proto = htons(ETH_P_IPV6); 2915 } 2916 2917 skb_reset_mac_header(skb); 2918 skb_set_network_header(skb, skb->len); 2919 iph = skb_put(skb, sizeof(struct ipv6hdr)); 2920 2921 skb_set_transport_header(skb, skb->len); 2922 udph = skb_put(skb, sizeof(struct udphdr)); 2923 skb_set_queue_mapping(skb, queue_map); 2924 skb->priority = pkt_dev->skb_priority; 2925 2926 memcpy(eth, pkt_dev->hh, 12); 2927 *(__be16 *) ð[12] = protocol; 2928 2929 /* Eth + IPh + UDPh + mpls */ 2930 datalen = pkt_dev->cur_pkt_size - 14 - 2931 sizeof(struct ipv6hdr) - sizeof(struct udphdr) - 2932 pkt_dev->pkt_overhead; 2933 2934 if (datalen < 0 || datalen < sizeof(struct pktgen_hdr)) { 2935 datalen = sizeof(struct pktgen_hdr); 2936 net_info_ratelimited("increased datalen to %d\n", datalen); 2937 } 2938 2939 udplen = datalen + sizeof(struct udphdr); 2940 udph->source = htons(pkt_dev->cur_udp_src); 2941 udph->dest = htons(pkt_dev->cur_udp_dst); 2942 udph->len = htons(udplen); 2943 udph->check = 0; 2944 2945 *(__be32 *) iph = htonl(0x60000000); /* Version + flow */ 2946 2947 if (pkt_dev->traffic_class) { 2948 /* Version + traffic class + flow (0) */ 2949 *(__be32 *)iph |= htonl(0x60000000 | (pkt_dev->traffic_class << 20)); 2950 } 2951 2952 iph->hop_limit = 32; 2953 2954 iph->payload_len = htons(udplen); 2955 iph->nexthdr = IPPROTO_UDP; 2956 2957 iph->daddr = pkt_dev->cur_in6_daddr; 2958 iph->saddr = pkt_dev->cur_in6_saddr; 2959 2960 skb->protocol = protocol; 2961 skb->dev = odev; 2962 skb->pkt_type = PACKET_HOST; 2963 2964 pktgen_finalize_skb(pkt_dev, skb, datalen); 2965 2966 if (!(pkt_dev->flags & F_UDPCSUM)) { 2967 skb->ip_summed = CHECKSUM_NONE; 2968 } else if (odev->features & (NETIF_F_HW_CSUM | NETIF_F_IPV6_CSUM)) { 2969 skb->ip_summed = CHECKSUM_PARTIAL; 2970 skb->csum_start = skb_transport_header(skb) - skb->head; 2971 skb->csum_offset = offsetof(struct udphdr, check); 2972 udph->check = ~csum_ipv6_magic(&iph->saddr, &iph->daddr, udplen, IPPROTO_UDP, 0); 2973 } else { 2974 __wsum csum = skb_checksum(skb, skb_transport_offset(skb), udplen, 0); 2975 2976 /* add protocol-dependent pseudo-header */ 2977 udph->check = csum_ipv6_magic(&iph->saddr, &iph->daddr, udplen, IPPROTO_UDP, csum); 2978 2979 if (udph->check == 0) 2980 udph->check = CSUM_MANGLED_0; 2981 } 2982 2983 return skb; 2984 } 2985 2986 static struct sk_buff *fill_packet(struct net_device *odev, 2987 struct pktgen_dev *pkt_dev) 2988 { 2989 if (pkt_dev->flags & F_IPV6) 2990 return fill_packet_ipv6(odev, pkt_dev); 2991 else 2992 return fill_packet_ipv4(odev, pkt_dev); 2993 } 2994 2995 static void pktgen_clear_counters(struct pktgen_dev *pkt_dev) 2996 { 2997 pkt_dev->seq_num = 1; 2998 pkt_dev->idle_acc = 0; 2999 pkt_dev->sofar = 0; 3000 pkt_dev->tx_bytes = 0; 3001 pkt_dev->errors = 0; 3002 } 3003 3004 /* Set up structure for sending pkts, clear counters */ 3005 3006 static void pktgen_run(struct pktgen_thread *t) 3007 { 3008 struct pktgen_dev *pkt_dev; 3009 int started = 0; 3010 3011 func_enter(); 3012 3013 rcu_read_lock(); 3014 list_for_each_entry_rcu(pkt_dev, &t->if_list, list) { 3015 3016 /* 3017 * setup odev and create initial packet. 3018 */ 3019 pktgen_setup_inject(pkt_dev); 3020 3021 if (pkt_dev->odev) { 3022 pktgen_clear_counters(pkt_dev); 3023 pkt_dev->skb = NULL; 3024 pkt_dev->started_at = pkt_dev->next_tx = ktime_get(); 3025 3026 set_pkt_overhead(pkt_dev); 3027 3028 strcpy(pkt_dev->result, "Starting"); 3029 pkt_dev->running = 1; /* Cranke yeself! */ 3030 started++; 3031 } else 3032 strcpy(pkt_dev->result, "Error starting"); 3033 } 3034 rcu_read_unlock(); 3035 if (started) 3036 t->control &= ~(T_STOP); 3037 } 3038 3039 static void pktgen_stop_all_threads_ifs(struct pktgen_net *pn) 3040 { 3041 struct pktgen_thread *t; 3042 3043 func_enter(); 3044 3045 mutex_lock(&pktgen_thread_lock); 3046 3047 list_for_each_entry(t, &pn->pktgen_threads, th_list) 3048 t->control |= T_STOP; 3049 3050 mutex_unlock(&pktgen_thread_lock); 3051 } 3052 3053 static int thread_is_running(const struct pktgen_thread *t) 3054 { 3055 const struct pktgen_dev *pkt_dev; 3056 3057 rcu_read_lock(); 3058 list_for_each_entry_rcu(pkt_dev, &t->if_list, list) 3059 if (pkt_dev->running) { 3060 rcu_read_unlock(); 3061 return 1; 3062 } 3063 rcu_read_unlock(); 3064 return 0; 3065 } 3066 3067 static int pktgen_wait_thread_run(struct pktgen_thread *t) 3068 { 3069 while (thread_is_running(t)) { 3070 3071 msleep_interruptible(100); 3072 3073 if (signal_pending(current)) 3074 goto signal; 3075 } 3076 return 1; 3077 signal: 3078 return 0; 3079 } 3080 3081 static int pktgen_wait_all_threads_run(struct pktgen_net *pn) 3082 { 3083 struct pktgen_thread *t; 3084 int sig = 1; 3085 3086 mutex_lock(&pktgen_thread_lock); 3087 3088 list_for_each_entry(t, &pn->pktgen_threads, th_list) { 3089 sig = pktgen_wait_thread_run(t); 3090 if (sig == 0) 3091 break; 3092 } 3093 3094 if (sig == 0) 3095 list_for_each_entry(t, &pn->pktgen_threads, th_list) 3096 t->control |= (T_STOP); 3097 3098 mutex_unlock(&pktgen_thread_lock); 3099 return sig; 3100 } 3101 3102 static void pktgen_run_all_threads(struct pktgen_net *pn) 3103 { 3104 struct pktgen_thread *t; 3105 3106 func_enter(); 3107 3108 mutex_lock(&pktgen_thread_lock); 3109 3110 list_for_each_entry(t, &pn->pktgen_threads, th_list) 3111 t->control |= (T_RUN); 3112 3113 mutex_unlock(&pktgen_thread_lock); 3114 3115 /* Propagate thread->control */ 3116 schedule_timeout_interruptible(msecs_to_jiffies(125)); 3117 3118 pktgen_wait_all_threads_run(pn); 3119 } 3120 3121 static void pktgen_reset_all_threads(struct pktgen_net *pn) 3122 { 3123 struct pktgen_thread *t; 3124 3125 func_enter(); 3126 3127 mutex_lock(&pktgen_thread_lock); 3128 3129 list_for_each_entry(t, &pn->pktgen_threads, th_list) 3130 t->control |= (T_REMDEVALL); 3131 3132 mutex_unlock(&pktgen_thread_lock); 3133 3134 /* Propagate thread->control */ 3135 schedule_timeout_interruptible(msecs_to_jiffies(125)); 3136 3137 pktgen_wait_all_threads_run(pn); 3138 } 3139 3140 static void show_results(struct pktgen_dev *pkt_dev, int nr_frags) 3141 { 3142 __u64 bps, mbps, pps; 3143 char *p = pkt_dev->result; 3144 ktime_t elapsed = ktime_sub(pkt_dev->stopped_at, 3145 pkt_dev->started_at); 3146 ktime_t idle = ns_to_ktime(pkt_dev->idle_acc); 3147 3148 p += sprintf(p, "OK: %llu(c%llu+d%llu) usec, %llu (%dbyte,%dfrags)\n", 3149 (unsigned long long)ktime_to_us(elapsed), 3150 (unsigned long long)ktime_to_us(ktime_sub(elapsed, idle)), 3151 (unsigned long long)ktime_to_us(idle), 3152 (unsigned long long)pkt_dev->sofar, 3153 pkt_dev->cur_pkt_size, nr_frags); 3154 3155 pps = div64_u64(pkt_dev->sofar * NSEC_PER_SEC, 3156 ktime_to_ns(elapsed)); 3157 3158 bps = pps * 8 * pkt_dev->cur_pkt_size; 3159 3160 mbps = bps; 3161 do_div(mbps, 1000000); 3162 p += sprintf(p, " %llupps %lluMb/sec (%llubps) errors: %llu", 3163 (unsigned long long)pps, 3164 (unsigned long long)mbps, 3165 (unsigned long long)bps, 3166 (unsigned long long)pkt_dev->errors); 3167 } 3168 3169 /* Set stopped-at timer, remove from running list, do counters & statistics */ 3170 static int pktgen_stop_device(struct pktgen_dev *pkt_dev) 3171 { 3172 int nr_frags = pkt_dev->skb ? skb_shinfo(pkt_dev->skb)->nr_frags : -1; 3173 3174 if (!pkt_dev->running) { 3175 pr_warn("interface: %s is already stopped\n", 3176 pkt_dev->odevname); 3177 return -EINVAL; 3178 } 3179 3180 pkt_dev->running = 0; 3181 kfree_skb(pkt_dev->skb); 3182 pkt_dev->skb = NULL; 3183 pkt_dev->stopped_at = ktime_get(); 3184 3185 show_results(pkt_dev, nr_frags); 3186 3187 return 0; 3188 } 3189 3190 static struct pktgen_dev *next_to_run(struct pktgen_thread *t) 3191 { 3192 struct pktgen_dev *pkt_dev, *best = NULL; 3193 3194 rcu_read_lock(); 3195 list_for_each_entry_rcu(pkt_dev, &t->if_list, list) { 3196 if (!pkt_dev->running) 3197 continue; 3198 if (best == NULL) 3199 best = pkt_dev; 3200 else if (ktime_compare(pkt_dev->next_tx, best->next_tx) < 0) 3201 best = pkt_dev; 3202 } 3203 rcu_read_unlock(); 3204 3205 return best; 3206 } 3207 3208 static void pktgen_stop(struct pktgen_thread *t) 3209 { 3210 struct pktgen_dev *pkt_dev; 3211 3212 func_enter(); 3213 3214 rcu_read_lock(); 3215 3216 list_for_each_entry_rcu(pkt_dev, &t->if_list, list) { 3217 pktgen_stop_device(pkt_dev); 3218 } 3219 3220 rcu_read_unlock(); 3221 } 3222 3223 /* 3224 * one of our devices needs to be removed - find it 3225 * and remove it 3226 */ 3227 static void pktgen_rem_one_if(struct pktgen_thread *t) 3228 { 3229 struct list_head *q, *n; 3230 struct pktgen_dev *cur; 3231 3232 func_enter(); 3233 3234 list_for_each_safe(q, n, &t->if_list) { 3235 cur = list_entry(q, struct pktgen_dev, list); 3236 3237 if (!cur->removal_mark) 3238 continue; 3239 3240 kfree_skb(cur->skb); 3241 cur->skb = NULL; 3242 3243 pktgen_remove_device(t, cur); 3244 3245 break; 3246 } 3247 } 3248 3249 static void pktgen_rem_all_ifs(struct pktgen_thread *t) 3250 { 3251 struct list_head *q, *n; 3252 struct pktgen_dev *cur; 3253 3254 func_enter(); 3255 3256 /* Remove all devices, free mem */ 3257 3258 list_for_each_safe(q, n, &t->if_list) { 3259 cur = list_entry(q, struct pktgen_dev, list); 3260 3261 kfree_skb(cur->skb); 3262 cur->skb = NULL; 3263 3264 pktgen_remove_device(t, cur); 3265 } 3266 } 3267 3268 static void pktgen_rem_thread(struct pktgen_thread *t) 3269 { 3270 /* Remove from the thread list */ 3271 remove_proc_entry(t->tsk->comm, t->net->proc_dir); 3272 } 3273 3274 static void pktgen_resched(struct pktgen_dev *pkt_dev) 3275 { 3276 ktime_t idle_start = ktime_get(); 3277 schedule(); 3278 pkt_dev->idle_acc += ktime_to_ns(ktime_sub(ktime_get(), idle_start)); 3279 } 3280 3281 static void pktgen_wait_for_skb(struct pktgen_dev *pkt_dev) 3282 { 3283 ktime_t idle_start = ktime_get(); 3284 3285 while (refcount_read(&(pkt_dev->skb->users)) != 1) { 3286 if (signal_pending(current)) 3287 break; 3288 3289 if (need_resched()) 3290 pktgen_resched(pkt_dev); 3291 else 3292 cpu_relax(); 3293 } 3294 pkt_dev->idle_acc += ktime_to_ns(ktime_sub(ktime_get(), idle_start)); 3295 } 3296 3297 static void pktgen_xmit(struct pktgen_dev *pkt_dev) 3298 { 3299 unsigned int burst = READ_ONCE(pkt_dev->burst); 3300 struct net_device *odev = pkt_dev->odev; 3301 struct netdev_queue *txq; 3302 struct sk_buff *skb; 3303 int ret; 3304 3305 /* If device is offline, then don't send */ 3306 if (unlikely(!netif_running(odev) || !netif_carrier_ok(odev))) { 3307 pktgen_stop_device(pkt_dev); 3308 return; 3309 } 3310 3311 /* This is max DELAY, this has special meaning of 3312 * "never transmit" 3313 */ 3314 if (unlikely(pkt_dev->delay == ULLONG_MAX)) { 3315 pkt_dev->next_tx = ktime_add_ns(ktime_get(), ULONG_MAX); 3316 return; 3317 } 3318 3319 /* If no skb or clone count exhausted then get new one */ 3320 if (!pkt_dev->skb || (pkt_dev->last_ok && 3321 ++pkt_dev->clone_count >= pkt_dev->clone_skb)) { 3322 /* build a new pkt */ 3323 kfree_skb(pkt_dev->skb); 3324 3325 pkt_dev->skb = fill_packet(odev, pkt_dev); 3326 if (pkt_dev->skb == NULL) { 3327 pr_err("ERROR: couldn't allocate skb in fill_packet\n"); 3328 schedule(); 3329 pkt_dev->clone_count--; /* back out increment, OOM */ 3330 return; 3331 } 3332 pkt_dev->last_pkt_size = pkt_dev->skb->len; 3333 pkt_dev->clone_count = 0; /* reset counter */ 3334 } 3335 3336 if (pkt_dev->delay && pkt_dev->last_ok) 3337 spin(pkt_dev, pkt_dev->next_tx); 3338 3339 if (pkt_dev->xmit_mode == M_NETIF_RECEIVE) { 3340 skb = pkt_dev->skb; 3341 skb->protocol = eth_type_trans(skb, skb->dev); 3342 refcount_add(burst, &skb->users); 3343 local_bh_disable(); 3344 do { 3345 ret = netif_receive_skb(skb); 3346 if (ret == NET_RX_DROP) 3347 pkt_dev->errors++; 3348 pkt_dev->sofar++; 3349 pkt_dev->seq_num++; 3350 if (refcount_read(&skb->users) != burst) { 3351 /* skb was queued by rps/rfs or taps, 3352 * so cannot reuse this skb 3353 */ 3354 WARN_ON(refcount_sub_and_test(burst - 1, &skb->users)); 3355 /* get out of the loop and wait 3356 * until skb is consumed 3357 */ 3358 break; 3359 } 3360 /* skb was 'freed' by stack, so clean few 3361 * bits and reuse it 3362 */ 3363 skb_reset_tc(skb); 3364 } while (--burst > 0); 3365 goto out; /* Skips xmit_mode M_START_XMIT */ 3366 } else if (pkt_dev->xmit_mode == M_QUEUE_XMIT) { 3367 local_bh_disable(); 3368 refcount_inc(&pkt_dev->skb->users); 3369 3370 ret = dev_queue_xmit(pkt_dev->skb); 3371 switch (ret) { 3372 case NET_XMIT_SUCCESS: 3373 pkt_dev->sofar++; 3374 pkt_dev->seq_num++; 3375 pkt_dev->tx_bytes += pkt_dev->last_pkt_size; 3376 break; 3377 case NET_XMIT_DROP: 3378 case NET_XMIT_CN: 3379 /* These are all valid return codes for a qdisc but 3380 * indicate packets are being dropped or will likely 3381 * be dropped soon. 3382 */ 3383 case NETDEV_TX_BUSY: 3384 /* qdisc may call dev_hard_start_xmit directly in cases 3385 * where no queues exist e.g. loopback device, virtual 3386 * devices, etc. In this case we need to handle 3387 * NETDEV_TX_ codes. 3388 */ 3389 default: 3390 pkt_dev->errors++; 3391 net_info_ratelimited("%s xmit error: %d\n", 3392 pkt_dev->odevname, ret); 3393 break; 3394 } 3395 goto out; 3396 } 3397 3398 txq = skb_get_tx_queue(odev, pkt_dev->skb); 3399 3400 local_bh_disable(); 3401 3402 HARD_TX_LOCK(odev, txq, smp_processor_id()); 3403 3404 if (unlikely(netif_xmit_frozen_or_drv_stopped(txq))) { 3405 ret = NETDEV_TX_BUSY; 3406 pkt_dev->last_ok = 0; 3407 goto unlock; 3408 } 3409 refcount_add(burst, &pkt_dev->skb->users); 3410 3411 xmit_more: 3412 ret = netdev_start_xmit(pkt_dev->skb, odev, txq, --burst > 0); 3413 3414 switch (ret) { 3415 case NETDEV_TX_OK: 3416 pkt_dev->last_ok = 1; 3417 pkt_dev->sofar++; 3418 pkt_dev->seq_num++; 3419 pkt_dev->tx_bytes += pkt_dev->last_pkt_size; 3420 if (burst > 0 && !netif_xmit_frozen_or_drv_stopped(txq)) 3421 goto xmit_more; 3422 break; 3423 case NET_XMIT_DROP: 3424 case NET_XMIT_CN: 3425 /* skb has been consumed */ 3426 pkt_dev->errors++; 3427 break; 3428 default: /* Drivers are not supposed to return other values! */ 3429 net_info_ratelimited("%s xmit error: %d\n", 3430 pkt_dev->odevname, ret); 3431 pkt_dev->errors++; 3432 /* fall through */ 3433 case NETDEV_TX_BUSY: 3434 /* Retry it next time */ 3435 refcount_dec(&(pkt_dev->skb->users)); 3436 pkt_dev->last_ok = 0; 3437 } 3438 if (unlikely(burst)) 3439 WARN_ON(refcount_sub_and_test(burst, &pkt_dev->skb->users)); 3440 unlock: 3441 HARD_TX_UNLOCK(odev, txq); 3442 3443 out: 3444 local_bh_enable(); 3445 3446 /* If pkt_dev->count is zero, then run forever */ 3447 if ((pkt_dev->count != 0) && (pkt_dev->sofar >= pkt_dev->count)) { 3448 pktgen_wait_for_skb(pkt_dev); 3449 3450 /* Done with this */ 3451 pktgen_stop_device(pkt_dev); 3452 } 3453 } 3454 3455 /* 3456 * Main loop of the thread goes here 3457 */ 3458 3459 static int pktgen_thread_worker(void *arg) 3460 { 3461 DEFINE_WAIT(wait); 3462 struct pktgen_thread *t = arg; 3463 struct pktgen_dev *pkt_dev = NULL; 3464 int cpu = t->cpu; 3465 3466 BUG_ON(smp_processor_id() != cpu); 3467 3468 init_waitqueue_head(&t->queue); 3469 complete(&t->start_done); 3470 3471 pr_debug("starting pktgen/%d: pid=%d\n", cpu, task_pid_nr(current)); 3472 3473 set_freezable(); 3474 3475 while (!kthread_should_stop()) { 3476 pkt_dev = next_to_run(t); 3477 3478 if (unlikely(!pkt_dev && t->control == 0)) { 3479 if (t->net->pktgen_exiting) 3480 break; 3481 wait_event_interruptible_timeout(t->queue, 3482 t->control != 0, 3483 HZ/10); 3484 try_to_freeze(); 3485 continue; 3486 } 3487 3488 if (likely(pkt_dev)) { 3489 pktgen_xmit(pkt_dev); 3490 3491 if (need_resched()) 3492 pktgen_resched(pkt_dev); 3493 else 3494 cpu_relax(); 3495 } 3496 3497 if (t->control & T_STOP) { 3498 pktgen_stop(t); 3499 t->control &= ~(T_STOP); 3500 } 3501 3502 if (t->control & T_RUN) { 3503 pktgen_run(t); 3504 t->control &= ~(T_RUN); 3505 } 3506 3507 if (t->control & T_REMDEVALL) { 3508 pktgen_rem_all_ifs(t); 3509 t->control &= ~(T_REMDEVALL); 3510 } 3511 3512 if (t->control & T_REMDEV) { 3513 pktgen_rem_one_if(t); 3514 t->control &= ~(T_REMDEV); 3515 } 3516 3517 try_to_freeze(); 3518 } 3519 3520 pr_debug("%s stopping all device\n", t->tsk->comm); 3521 pktgen_stop(t); 3522 3523 pr_debug("%s removing all device\n", t->tsk->comm); 3524 pktgen_rem_all_ifs(t); 3525 3526 pr_debug("%s removing thread\n", t->tsk->comm); 3527 pktgen_rem_thread(t); 3528 3529 return 0; 3530 } 3531 3532 static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t, 3533 const char *ifname, bool exact) 3534 { 3535 struct pktgen_dev *p, *pkt_dev = NULL; 3536 size_t len = strlen(ifname); 3537 3538 rcu_read_lock(); 3539 list_for_each_entry_rcu(p, &t->if_list, list) 3540 if (strncmp(p->odevname, ifname, len) == 0) { 3541 if (p->odevname[len]) { 3542 if (exact || p->odevname[len] != '@') 3543 continue; 3544 } 3545 pkt_dev = p; 3546 break; 3547 } 3548 3549 rcu_read_unlock(); 3550 pr_debug("find_dev(%s) returning %p\n", ifname, pkt_dev); 3551 return pkt_dev; 3552 } 3553 3554 /* 3555 * Adds a dev at front of if_list. 3556 */ 3557 3558 static int add_dev_to_thread(struct pktgen_thread *t, 3559 struct pktgen_dev *pkt_dev) 3560 { 3561 int rv = 0; 3562 3563 /* This function cannot be called concurrently, as its called 3564 * under pktgen_thread_lock mutex, but it can run from 3565 * userspace on another CPU than the kthread. The if_lock() 3566 * is used here to sync with concurrent instances of 3567 * _rem_dev_from_if_list() invoked via kthread, which is also 3568 * updating the if_list */ 3569 if_lock(t); 3570 3571 if (pkt_dev->pg_thread) { 3572 pr_err("ERROR: already assigned to a thread\n"); 3573 rv = -EBUSY; 3574 goto out; 3575 } 3576 3577 pkt_dev->running = 0; 3578 pkt_dev->pg_thread = t; 3579 list_add_rcu(&pkt_dev->list, &t->if_list); 3580 3581 out: 3582 if_unlock(t); 3583 return rv; 3584 } 3585 3586 /* Called under thread lock */ 3587 3588 static int pktgen_add_device(struct pktgen_thread *t, const char *ifname) 3589 { 3590 struct pktgen_dev *pkt_dev; 3591 int err; 3592 int node = cpu_to_node(t->cpu); 3593 3594 /* We don't allow a device to be on several threads */ 3595 3596 pkt_dev = __pktgen_NN_threads(t->net, ifname, FIND); 3597 if (pkt_dev) { 3598 pr_err("ERROR: interface already used\n"); 3599 return -EBUSY; 3600 } 3601 3602 pkt_dev = kzalloc_node(sizeof(struct pktgen_dev), GFP_KERNEL, node); 3603 if (!pkt_dev) 3604 return -ENOMEM; 3605 3606 strcpy(pkt_dev->odevname, ifname); 3607 pkt_dev->flows = vzalloc_node(array_size(MAX_CFLOWS, 3608 sizeof(struct flow_state)), 3609 node); 3610 if (pkt_dev->flows == NULL) { 3611 kfree(pkt_dev); 3612 return -ENOMEM; 3613 } 3614 3615 pkt_dev->removal_mark = 0; 3616 pkt_dev->nfrags = 0; 3617 pkt_dev->delay = pg_delay_d; 3618 pkt_dev->count = pg_count_d; 3619 pkt_dev->sofar = 0; 3620 pkt_dev->udp_src_min = 9; /* sink port */ 3621 pkt_dev->udp_src_max = 9; 3622 pkt_dev->udp_dst_min = 9; 3623 pkt_dev->udp_dst_max = 9; 3624 pkt_dev->vlan_p = 0; 3625 pkt_dev->vlan_cfi = 0; 3626 pkt_dev->vlan_id = 0xffff; 3627 pkt_dev->svlan_p = 0; 3628 pkt_dev->svlan_cfi = 0; 3629 pkt_dev->svlan_id = 0xffff; 3630 pkt_dev->burst = 1; 3631 pkt_dev->node = NUMA_NO_NODE; 3632 3633 err = pktgen_setup_dev(t->net, pkt_dev, ifname); 3634 if (err) 3635 goto out1; 3636 if (pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING) 3637 pkt_dev->clone_skb = pg_clone_skb_d; 3638 3639 pkt_dev->entry = proc_create_data(ifname, 0600, t->net->proc_dir, 3640 &pktgen_if_fops, pkt_dev); 3641 if (!pkt_dev->entry) { 3642 pr_err("cannot create %s/%s procfs entry\n", 3643 PG_PROC_DIR, ifname); 3644 err = -EINVAL; 3645 goto out2; 3646 } 3647 #ifdef CONFIG_XFRM 3648 pkt_dev->ipsmode = XFRM_MODE_TRANSPORT; 3649 pkt_dev->ipsproto = IPPROTO_ESP; 3650 3651 /* xfrm tunnel mode needs additional dst to extract outter 3652 * ip header protocol/ttl/id field, here creat a phony one. 3653 * instead of looking for a valid rt, which definitely hurting 3654 * performance under such circumstance. 3655 */ 3656 pkt_dev->dstops.family = AF_INET; 3657 pkt_dev->xdst.u.dst.dev = pkt_dev->odev; 3658 dst_init_metrics(&pkt_dev->xdst.u.dst, pktgen_dst_metrics, false); 3659 pkt_dev->xdst.child = &pkt_dev->xdst.u.dst; 3660 pkt_dev->xdst.u.dst.ops = &pkt_dev->dstops; 3661 #endif 3662 3663 return add_dev_to_thread(t, pkt_dev); 3664 out2: 3665 dev_put(pkt_dev->odev); 3666 out1: 3667 #ifdef CONFIG_XFRM 3668 free_SAs(pkt_dev); 3669 #endif 3670 vfree(pkt_dev->flows); 3671 kfree(pkt_dev); 3672 return err; 3673 } 3674 3675 static int __net_init pktgen_create_thread(int cpu, struct pktgen_net *pn) 3676 { 3677 struct pktgen_thread *t; 3678 struct proc_dir_entry *pe; 3679 struct task_struct *p; 3680 3681 t = kzalloc_node(sizeof(struct pktgen_thread), GFP_KERNEL, 3682 cpu_to_node(cpu)); 3683 if (!t) { 3684 pr_err("ERROR: out of memory, can't create new thread\n"); 3685 return -ENOMEM; 3686 } 3687 3688 mutex_init(&t->if_lock); 3689 t->cpu = cpu; 3690 3691 INIT_LIST_HEAD(&t->if_list); 3692 3693 list_add_tail(&t->th_list, &pn->pktgen_threads); 3694 init_completion(&t->start_done); 3695 3696 p = kthread_create_on_node(pktgen_thread_worker, 3697 t, 3698 cpu_to_node(cpu), 3699 "kpktgend_%d", cpu); 3700 if (IS_ERR(p)) { 3701 pr_err("kernel_thread() failed for cpu %d\n", t->cpu); 3702 list_del(&t->th_list); 3703 kfree(t); 3704 return PTR_ERR(p); 3705 } 3706 kthread_bind(p, cpu); 3707 t->tsk = p; 3708 3709 pe = proc_create_data(t->tsk->comm, 0600, pn->proc_dir, 3710 &pktgen_thread_fops, t); 3711 if (!pe) { 3712 pr_err("cannot create %s/%s procfs entry\n", 3713 PG_PROC_DIR, t->tsk->comm); 3714 kthread_stop(p); 3715 list_del(&t->th_list); 3716 kfree(t); 3717 return -EINVAL; 3718 } 3719 3720 t->net = pn; 3721 get_task_struct(p); 3722 wake_up_process(p); 3723 wait_for_completion(&t->start_done); 3724 3725 return 0; 3726 } 3727 3728 /* 3729 * Removes a device from the thread if_list. 3730 */ 3731 static void _rem_dev_from_if_list(struct pktgen_thread *t, 3732 struct pktgen_dev *pkt_dev) 3733 { 3734 struct list_head *q, *n; 3735 struct pktgen_dev *p; 3736 3737 if_lock(t); 3738 list_for_each_safe(q, n, &t->if_list) { 3739 p = list_entry(q, struct pktgen_dev, list); 3740 if (p == pkt_dev) 3741 list_del_rcu(&p->list); 3742 } 3743 if_unlock(t); 3744 } 3745 3746 static int pktgen_remove_device(struct pktgen_thread *t, 3747 struct pktgen_dev *pkt_dev) 3748 { 3749 pr_debug("remove_device pkt_dev=%p\n", pkt_dev); 3750 3751 if (pkt_dev->running) { 3752 pr_warn("WARNING: trying to remove a running interface, stopping it now\n"); 3753 pktgen_stop_device(pkt_dev); 3754 } 3755 3756 /* Dis-associate from the interface */ 3757 3758 if (pkt_dev->odev) { 3759 dev_put(pkt_dev->odev); 3760 pkt_dev->odev = NULL; 3761 } 3762 3763 /* Remove proc before if_list entry, because add_device uses 3764 * list to determine if interface already exist, avoid race 3765 * with proc_create_data() */ 3766 proc_remove(pkt_dev->entry); 3767 3768 /* And update the thread if_list */ 3769 _rem_dev_from_if_list(t, pkt_dev); 3770 3771 #ifdef CONFIG_XFRM 3772 free_SAs(pkt_dev); 3773 #endif 3774 vfree(pkt_dev->flows); 3775 if (pkt_dev->page) 3776 put_page(pkt_dev->page); 3777 kfree_rcu(pkt_dev, rcu); 3778 return 0; 3779 } 3780 3781 static int __net_init pg_net_init(struct net *net) 3782 { 3783 struct pktgen_net *pn = net_generic(net, pg_net_id); 3784 struct proc_dir_entry *pe; 3785 int cpu, ret = 0; 3786 3787 pn->net = net; 3788 INIT_LIST_HEAD(&pn->pktgen_threads); 3789 pn->pktgen_exiting = false; 3790 pn->proc_dir = proc_mkdir(PG_PROC_DIR, pn->net->proc_net); 3791 if (!pn->proc_dir) { 3792 pr_warn("cannot create /proc/net/%s\n", PG_PROC_DIR); 3793 return -ENODEV; 3794 } 3795 pe = proc_create(PGCTRL, 0600, pn->proc_dir, &pktgen_fops); 3796 if (pe == NULL) { 3797 pr_err("cannot create %s procfs entry\n", PGCTRL); 3798 ret = -EINVAL; 3799 goto remove; 3800 } 3801 3802 for_each_online_cpu(cpu) { 3803 int err; 3804 3805 err = pktgen_create_thread(cpu, pn); 3806 if (err) 3807 pr_warn("Cannot create thread for cpu %d (%d)\n", 3808 cpu, err); 3809 } 3810 3811 if (list_empty(&pn->pktgen_threads)) { 3812 pr_err("Initialization failed for all threads\n"); 3813 ret = -ENODEV; 3814 goto remove_entry; 3815 } 3816 3817 return 0; 3818 3819 remove_entry: 3820 remove_proc_entry(PGCTRL, pn->proc_dir); 3821 remove: 3822 remove_proc_entry(PG_PROC_DIR, pn->net->proc_net); 3823 return ret; 3824 } 3825 3826 static void __net_exit pg_net_exit(struct net *net) 3827 { 3828 struct pktgen_net *pn = net_generic(net, pg_net_id); 3829 struct pktgen_thread *t; 3830 struct list_head *q, *n; 3831 LIST_HEAD(list); 3832 3833 /* Stop all interfaces & threads */ 3834 pn->pktgen_exiting = true; 3835 3836 mutex_lock(&pktgen_thread_lock); 3837 list_splice_init(&pn->pktgen_threads, &list); 3838 mutex_unlock(&pktgen_thread_lock); 3839 3840 list_for_each_safe(q, n, &list) { 3841 t = list_entry(q, struct pktgen_thread, th_list); 3842 list_del(&t->th_list); 3843 kthread_stop(t->tsk); 3844 put_task_struct(t->tsk); 3845 kfree(t); 3846 } 3847 3848 remove_proc_entry(PGCTRL, pn->proc_dir); 3849 remove_proc_entry(PG_PROC_DIR, pn->net->proc_net); 3850 } 3851 3852 static struct pernet_operations pg_net_ops = { 3853 .init = pg_net_init, 3854 .exit = pg_net_exit, 3855 .id = &pg_net_id, 3856 .size = sizeof(struct pktgen_net), 3857 }; 3858 3859 static int __init pg_init(void) 3860 { 3861 int ret = 0; 3862 3863 pr_info("%s", version); 3864 ret = register_pernet_subsys(&pg_net_ops); 3865 if (ret) 3866 return ret; 3867 ret = register_netdevice_notifier(&pktgen_notifier_block); 3868 if (ret) 3869 unregister_pernet_subsys(&pg_net_ops); 3870 3871 return ret; 3872 } 3873 3874 static void __exit pg_cleanup(void) 3875 { 3876 unregister_netdevice_notifier(&pktgen_notifier_block); 3877 unregister_pernet_subsys(&pg_net_ops); 3878 /* Don't need rcu_barrier() due to use of kfree_rcu() */ 3879 } 3880 3881 module_init(pg_init); 3882 module_exit(pg_cleanup); 3883 3884 MODULE_AUTHOR("Robert Olsson <robert.olsson@its.uu.se>"); 3885 MODULE_DESCRIPTION("Packet Generator tool"); 3886 MODULE_LICENSE("GPL"); 3887 MODULE_VERSION(VERSION); 3888 module_param(pg_count_d, int, 0); 3889 MODULE_PARM_DESC(pg_count_d, "Default number of packets to inject"); 3890 module_param(pg_delay_d, int, 0); 3891 MODULE_PARM_DESC(pg_delay_d, "Default delay between packets (nanoseconds)"); 3892 module_param(pg_clone_skb_d, int, 0); 3893 MODULE_PARM_DESC(pg_clone_skb_d, "Default number of copies of the same packet"); 3894 module_param(debug, int, 0); 3895 MODULE_PARM_DESC(debug, "Enable debugging of pktgen module"); 3896