1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Authors: 4 * Copyright 2001, 2002 by Robert Olsson <robert.olsson@its.uu.se> 5 * Uppsala University and 6 * Swedish University of Agricultural Sciences 7 * 8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 9 * Ben Greear <greearb@candelatech.com> 10 * Jens Låås <jens.laas@data.slu.se> 11 * 12 * A tool for loading the network with preconfigurated packets. 13 * The tool is implemented as a linux module. Parameters are output 14 * device, delay (to hard_xmit), number of packets, and whether 15 * to use multiple SKBs or just the same one. 16 * pktgen uses the installed interface's output routine. 17 * 18 * Additional hacking by: 19 * 20 * Jens.Laas@data.slu.se 21 * Improved by ANK. 010120. 22 * Improved by ANK even more. 010212. 23 * MAC address typo fixed. 010417 --ro 24 * Integrated. 020301 --DaveM 25 * Added multiskb option 020301 --DaveM 26 * Scaling of results. 020417--sigurdur@linpro.no 27 * Significant re-work of the module: 28 * * Convert to threaded model to more efficiently be able to transmit 29 * and receive on multiple interfaces at once. 30 * * Converted many counters to __u64 to allow longer runs. 31 * * Allow configuration of ranges, like min/max IP address, MACs, 32 * and UDP-ports, for both source and destination, and can 33 * set to use a random distribution or sequentially walk the range. 34 * * Can now change most values after starting. 35 * * Place 12-byte packet in UDP payload with magic number, 36 * sequence number, and timestamp. 37 * * Add receiver code that detects dropped pkts, re-ordered pkts, and 38 * latencies (with micro-second) precision. 39 * * Add IOCTL interface to easily get counters & configuration. 40 * --Ben Greear <greearb@candelatech.com> 41 * 42 * Renamed multiskb to clone_skb and cleaned up sending core for two distinct 43 * skb modes. A clone_skb=0 mode for Ben "ranges" work and a clone_skb != 0 44 * as a "fastpath" with a configurable number of clones after alloc's. 45 * clone_skb=0 means all packets are allocated this also means ranges time 46 * stamps etc can be used. clone_skb=100 means 1 malloc is followed by 100 47 * clones. 48 * 49 * Also moved to /proc/net/pktgen/ 50 * --ro 51 * 52 * Sept 10: Fixed threading/locking. Lots of bone-headed and more clever 53 * mistakes. Also merged in DaveM's patch in the -pre6 patch. 54 * --Ben Greear <greearb@candelatech.com> 55 * 56 * Integrated to 2.5.x 021029 --Lucio Maciel (luciomaciel@zipmail.com.br) 57 * 58 * 021124 Finished major redesign and rewrite for new functionality. 59 * See Documentation/networking/pktgen.rst for how to use this. 60 * 61 * The new operation: 62 * For each CPU one thread/process is created at start. This process checks 63 * for running devices in the if_list and sends packets until count is 0 it 64 * also the thread checks the thread->control which is used for inter-process 65 * communication. controlling process "posts" operations to the threads this 66 * way. 67 * The if_list is RCU protected, and the if_lock remains to protect updating 68 * of if_list, from "add_device" as it invoked from userspace (via proc write). 69 * 70 * By design there should only be *one* "controlling" process. In practice 71 * multiple write accesses gives unpredictable result. Understood by "write" 72 * to /proc gives result code thats should be read be the "writer". 73 * For practical use this should be no problem. 74 * 75 * Note when adding devices to a specific CPU there good idea to also assign 76 * /proc/irq/XX/smp_affinity so TX-interrupts gets bound to the same CPU. 77 * --ro 78 * 79 * Fix refcount off by one if first packet fails, potential null deref, 80 * memleak 030710- KJP 81 * 82 * First "ranges" functionality for ipv6 030726 --ro 83 * 84 * Included flow support. 030802 ANK. 85 * 86 * Fixed unaligned access on IA-64 Grant Grundler <grundler@parisc-linux.org> 87 * 88 * Remove if fix from added Harald Welte <laforge@netfilter.org> 040419 89 * ia64 compilation fix from Aron Griffis <aron@hp.com> 040604 90 * 91 * New xmit() return, do_div and misc clean up by Stephen Hemminger 92 * <shemminger@osdl.org> 040923 93 * 94 * Randy Dunlap fixed u64 printk compiler warning 95 * 96 * Remove FCS from BW calculation. Lennert Buytenhek <buytenh@wantstofly.org> 97 * New time handling. Lennert Buytenhek <buytenh@wantstofly.org> 041213 98 * 99 * Corrections from Nikolai Malykh (nmalykh@bilim.com) 100 * Removed unused flags F_SET_SRCMAC & F_SET_SRCIP 041230 101 * 102 * interruptible_sleep_on_timeout() replaced Nishanth Aravamudan <nacc@us.ibm.com> 103 * 050103 104 * 105 * MPLS support by Steven Whitehouse <steve@chygwyn.com> 106 * 107 * 802.1Q/Q-in-Q support by Francesco Fondelli (FF) <francesco.fondelli@gmail.com> 108 * 109 * Fixed src_mac command to set source mac of packet to value specified in 110 * command by Adit Ranadive <adit.262@gmail.com> 111 */ 112 113 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 114 115 #include <linux/sys.h> 116 #include <linux/types.h> 117 #include <linux/module.h> 118 #include <linux/moduleparam.h> 119 #include <linux/kernel.h> 120 #include <linux/mutex.h> 121 #include <linux/sched.h> 122 #include <linux/slab.h> 123 #include <linux/vmalloc.h> 124 #include <linux/unistd.h> 125 #include <linux/string.h> 126 #include <linux/ptrace.h> 127 #include <linux/errno.h> 128 #include <linux/ioport.h> 129 #include <linux/interrupt.h> 130 #include <linux/capability.h> 131 #include <linux/hrtimer.h> 132 #include <linux/freezer.h> 133 #include <linux/delay.h> 134 #include <linux/timer.h> 135 #include <linux/list.h> 136 #include <linux/init.h> 137 #include <linux/skbuff.h> 138 #include <linux/netdevice.h> 139 #include <linux/inet.h> 140 #include <linux/inetdevice.h> 141 #include <linux/rtnetlink.h> 142 #include <linux/if_arp.h> 143 #include <linux/if_vlan.h> 144 #include <linux/in.h> 145 #include <linux/ip.h> 146 #include <linux/ipv6.h> 147 #include <linux/udp.h> 148 #include <linux/proc_fs.h> 149 #include <linux/seq_file.h> 150 #include <linux/wait.h> 151 #include <linux/etherdevice.h> 152 #include <linux/kthread.h> 153 #include <linux/prefetch.h> 154 #include <linux/mmzone.h> 155 #include <net/net_namespace.h> 156 #include <net/checksum.h> 157 #include <net/ipv6.h> 158 #include <net/udp.h> 159 #include <net/ip6_checksum.h> 160 #include <net/addrconf.h> 161 #ifdef CONFIG_XFRM 162 #include <net/xfrm.h> 163 #endif 164 #include <net/netns/generic.h> 165 #include <asm/byteorder.h> 166 #include <linux/rcupdate.h> 167 #include <linux/bitops.h> 168 #include <linux/io.h> 169 #include <linux/timex.h> 170 #include <linux/uaccess.h> 171 #include <asm/dma.h> 172 #include <asm/div64.h> /* do_div */ 173 174 #define VERSION "2.75" 175 #define IP_NAME_SZ 32 176 #define MAX_MPLS_LABELS 16 /* This is the max label stack depth */ 177 #define MPLS_STACK_BOTTOM htonl(0x00000100) 178 179 #define func_enter() pr_debug("entering %s\n", __func__); 180 181 #define PKT_FLAGS \ 182 pf(IPV6) /* Interface in IPV6 Mode */ \ 183 pf(IPSRC_RND) /* IP-Src Random */ \ 184 pf(IPDST_RND) /* IP-Dst Random */ \ 185 pf(TXSIZE_RND) /* Transmit size is random */ \ 186 pf(UDPSRC_RND) /* UDP-Src Random */ \ 187 pf(UDPDST_RND) /* UDP-Dst Random */ \ 188 pf(UDPCSUM) /* Include UDP checksum */ \ 189 pf(NO_TIMESTAMP) /* Don't timestamp packets (default TS) */ \ 190 pf(MPLS_RND) /* Random MPLS labels */ \ 191 pf(QUEUE_MAP_RND) /* queue map Random */ \ 192 pf(QUEUE_MAP_CPU) /* queue map mirrors smp_processor_id() */ \ 193 pf(FLOW_SEQ) /* Sequential flows */ \ 194 pf(IPSEC) /* ipsec on for flows */ \ 195 pf(MACSRC_RND) /* MAC-Src Random */ \ 196 pf(MACDST_RND) /* MAC-Dst Random */ \ 197 pf(VID_RND) /* Random VLAN ID */ \ 198 pf(SVID_RND) /* Random SVLAN ID */ \ 199 pf(NODE) /* Node memory alloc*/ \ 200 201 #define pf(flag) flag##_SHIFT, 202 enum pkt_flags { 203 PKT_FLAGS 204 }; 205 #undef pf 206 207 /* Device flag bits */ 208 #define pf(flag) static const __u32 F_##flag = (1<<flag##_SHIFT); 209 PKT_FLAGS 210 #undef pf 211 212 #define pf(flag) __stringify(flag), 213 static char *pkt_flag_names[] = { 214 PKT_FLAGS 215 }; 216 #undef pf 217 218 #define NR_PKT_FLAGS ARRAY_SIZE(pkt_flag_names) 219 220 /* Thread control flag bits */ 221 #define T_STOP (1<<0) /* Stop run */ 222 #define T_RUN (1<<1) /* Start run */ 223 #define T_REMDEVALL (1<<2) /* Remove all devs */ 224 #define T_REMDEV (1<<3) /* Remove one dev */ 225 226 /* Xmit modes */ 227 #define M_START_XMIT 0 /* Default normal TX */ 228 #define M_NETIF_RECEIVE 1 /* Inject packets into stack */ 229 #define M_QUEUE_XMIT 2 /* Inject packet into qdisc */ 230 231 /* If lock -- protects updating of if_list */ 232 #define if_lock(t) mutex_lock(&(t->if_lock)); 233 #define if_unlock(t) mutex_unlock(&(t->if_lock)); 234 235 /* Used to help with determining the pkts on receive */ 236 #define PKTGEN_MAGIC 0xbe9be955 237 #define PG_PROC_DIR "pktgen" 238 #define PGCTRL "pgctrl" 239 240 #define MAX_CFLOWS 65536 241 242 #define VLAN_TAG_SIZE(x) ((x)->vlan_id == 0xffff ? 0 : 4) 243 #define SVLAN_TAG_SIZE(x) ((x)->svlan_id == 0xffff ? 0 : 4) 244 245 struct flow_state { 246 __be32 cur_daddr; 247 int count; 248 #ifdef CONFIG_XFRM 249 struct xfrm_state *x; 250 #endif 251 __u32 flags; 252 }; 253 254 /* flow flag bits */ 255 #define F_INIT (1<<0) /* flow has been initialized */ 256 257 struct pktgen_dev { 258 /* 259 * Try to keep frequent/infrequent used vars. separated. 260 */ 261 struct proc_dir_entry *entry; /* proc file */ 262 struct pktgen_thread *pg_thread;/* the owner */ 263 struct list_head list; /* chaining in the thread's run-queue */ 264 struct rcu_head rcu; /* freed by RCU */ 265 266 int running; /* if false, the test will stop */ 267 268 /* If min != max, then we will either do a linear iteration, or 269 * we will do a random selection from within the range. 270 */ 271 __u32 flags; 272 int xmit_mode; 273 int min_pkt_size; 274 int max_pkt_size; 275 int pkt_overhead; /* overhead for MPLS, VLANs, IPSEC etc */ 276 int nfrags; 277 int removal_mark; /* non-zero => the device is marked for 278 * removal by worker thread */ 279 280 struct page *page; 281 u64 delay; /* nano-seconds */ 282 283 __u64 count; /* Default No packets to send */ 284 __u64 sofar; /* How many pkts we've sent so far */ 285 __u64 tx_bytes; /* How many bytes we've transmitted */ 286 __u64 errors; /* Errors when trying to transmit, */ 287 288 /* runtime counters relating to clone_skb */ 289 290 __u32 clone_count; 291 int last_ok; /* Was last skb sent? 292 * Or a failed transmit of some sort? 293 * This will keep sequence numbers in order 294 */ 295 ktime_t next_tx; 296 ktime_t started_at; 297 ktime_t stopped_at; 298 u64 idle_acc; /* nano-seconds */ 299 300 __u32 seq_num; 301 302 int clone_skb; /* 303 * Use multiple SKBs during packet gen. 304 * If this number is greater than 1, then 305 * that many copies of the same packet will be 306 * sent before a new packet is allocated. 307 * If you want to send 1024 identical packets 308 * before creating a new packet, 309 * set clone_skb to 1024. 310 */ 311 312 char dst_min[IP_NAME_SZ]; /* IP, ie 1.2.3.4 */ 313 char dst_max[IP_NAME_SZ]; /* IP, ie 1.2.3.4 */ 314 char src_min[IP_NAME_SZ]; /* IP, ie 1.2.3.4 */ 315 char src_max[IP_NAME_SZ]; /* IP, ie 1.2.3.4 */ 316 317 struct in6_addr in6_saddr; 318 struct in6_addr in6_daddr; 319 struct in6_addr cur_in6_daddr; 320 struct in6_addr cur_in6_saddr; 321 /* For ranges */ 322 struct in6_addr min_in6_daddr; 323 struct in6_addr max_in6_daddr; 324 struct in6_addr min_in6_saddr; 325 struct in6_addr max_in6_saddr; 326 327 /* If we're doing ranges, random or incremental, then this 328 * defines the min/max for those ranges. 329 */ 330 __be32 saddr_min; /* inclusive, source IP address */ 331 __be32 saddr_max; /* exclusive, source IP address */ 332 __be32 daddr_min; /* inclusive, dest IP address */ 333 __be32 daddr_max; /* exclusive, dest IP address */ 334 335 __u16 udp_src_min; /* inclusive, source UDP port */ 336 __u16 udp_src_max; /* exclusive, source UDP port */ 337 __u16 udp_dst_min; /* inclusive, dest UDP port */ 338 __u16 udp_dst_max; /* exclusive, dest UDP port */ 339 340 /* DSCP + ECN */ 341 __u8 tos; /* six MSB of (former) IPv4 TOS 342 are for dscp codepoint */ 343 __u8 traffic_class; /* ditto for the (former) Traffic Class in IPv6 344 (see RFC 3260, sec. 4) */ 345 346 /* MPLS */ 347 unsigned int nr_labels; /* Depth of stack, 0 = no MPLS */ 348 __be32 labels[MAX_MPLS_LABELS]; 349 350 /* VLAN/SVLAN (802.1Q/Q-in-Q) */ 351 __u8 vlan_p; 352 __u8 vlan_cfi; 353 __u16 vlan_id; /* 0xffff means no vlan tag */ 354 355 __u8 svlan_p; 356 __u8 svlan_cfi; 357 __u16 svlan_id; /* 0xffff means no svlan tag */ 358 359 __u32 src_mac_count; /* How many MACs to iterate through */ 360 __u32 dst_mac_count; /* How many MACs to iterate through */ 361 362 unsigned char dst_mac[ETH_ALEN]; 363 unsigned char src_mac[ETH_ALEN]; 364 365 __u32 cur_dst_mac_offset; 366 __u32 cur_src_mac_offset; 367 __be32 cur_saddr; 368 __be32 cur_daddr; 369 __u16 ip_id; 370 __u16 cur_udp_dst; 371 __u16 cur_udp_src; 372 __u16 cur_queue_map; 373 __u32 cur_pkt_size; 374 __u32 last_pkt_size; 375 376 __u8 hh[14]; 377 /* = { 378 0x00, 0x80, 0xC8, 0x79, 0xB3, 0xCB, 379 380 We fill in SRC address later 381 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 382 0x08, 0x00 383 }; 384 */ 385 __u16 pad; /* pad out the hh struct to an even 16 bytes */ 386 387 struct sk_buff *skb; /* skb we are to transmit next, used for when we 388 * are transmitting the same one multiple times 389 */ 390 struct net_device *odev; /* The out-going device. 391 * Note that the device should have it's 392 * pg_info pointer pointing back to this 393 * device. 394 * Set when the user specifies the out-going 395 * device name (not when the inject is 396 * started as it used to do.) 397 */ 398 char odevname[32]; 399 struct flow_state *flows; 400 unsigned int cflows; /* Concurrent flows (config) */ 401 unsigned int lflow; /* Flow length (config) */ 402 unsigned int nflows; /* accumulated flows (stats) */ 403 unsigned int curfl; /* current sequenced flow (state)*/ 404 405 u16 queue_map_min; 406 u16 queue_map_max; 407 __u32 skb_priority; /* skb priority field */ 408 unsigned int burst; /* number of duplicated packets to burst */ 409 int node; /* Memory node */ 410 411 #ifdef CONFIG_XFRM 412 __u8 ipsmode; /* IPSEC mode (config) */ 413 __u8 ipsproto; /* IPSEC type (config) */ 414 __u32 spi; 415 struct xfrm_dst xdst; 416 struct dst_ops dstops; 417 #endif 418 char result[512]; 419 }; 420 421 struct pktgen_hdr { 422 __be32 pgh_magic; 423 __be32 seq_num; 424 __be32 tv_sec; 425 __be32 tv_usec; 426 }; 427 428 429 static unsigned int pg_net_id __read_mostly; 430 431 struct pktgen_net { 432 struct net *net; 433 struct proc_dir_entry *proc_dir; 434 struct list_head pktgen_threads; 435 bool pktgen_exiting; 436 }; 437 438 struct pktgen_thread { 439 struct mutex if_lock; /* for list of devices */ 440 struct list_head if_list; /* All device here */ 441 struct list_head th_list; 442 struct task_struct *tsk; 443 char result[512]; 444 445 /* Field for thread to receive "posted" events terminate, 446 stop ifs etc. */ 447 448 u32 control; 449 int cpu; 450 451 wait_queue_head_t queue; 452 struct completion start_done; 453 struct pktgen_net *net; 454 }; 455 456 #define REMOVE 1 457 #define FIND 0 458 459 static const char version[] = 460 "Packet Generator for packet performance testing. " 461 "Version: " VERSION "\n"; 462 463 static int pktgen_remove_device(struct pktgen_thread *t, struct pktgen_dev *i); 464 static int pktgen_add_device(struct pktgen_thread *t, const char *ifname); 465 static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t, 466 const char *ifname, bool exact); 467 static int pktgen_device_event(struct notifier_block *, unsigned long, void *); 468 static void pktgen_run_all_threads(struct pktgen_net *pn); 469 static void pktgen_reset_all_threads(struct pktgen_net *pn); 470 static void pktgen_stop_all_threads(struct pktgen_net *pn); 471 472 static void pktgen_stop(struct pktgen_thread *t); 473 static void pktgen_clear_counters(struct pktgen_dev *pkt_dev); 474 475 /* Module parameters, defaults. */ 476 static int pg_count_d __read_mostly = 1000; 477 static int pg_delay_d __read_mostly; 478 static int pg_clone_skb_d __read_mostly; 479 static int debug __read_mostly; 480 481 static DEFINE_MUTEX(pktgen_thread_lock); 482 483 static struct notifier_block pktgen_notifier_block = { 484 .notifier_call = pktgen_device_event, 485 }; 486 487 /* 488 * /proc handling functions 489 * 490 */ 491 492 static int pgctrl_show(struct seq_file *seq, void *v) 493 { 494 seq_puts(seq, version); 495 return 0; 496 } 497 498 static ssize_t pgctrl_write(struct file *file, const char __user *buf, 499 size_t count, loff_t *ppos) 500 { 501 char data[128]; 502 struct pktgen_net *pn = net_generic(current->nsproxy->net_ns, pg_net_id); 503 504 if (!capable(CAP_NET_ADMIN)) 505 return -EPERM; 506 507 if (count == 0) 508 return -EINVAL; 509 510 if (count > sizeof(data)) 511 count = sizeof(data); 512 513 if (copy_from_user(data, buf, count)) 514 return -EFAULT; 515 516 data[count - 1] = 0; /* Strip trailing '\n' and terminate string */ 517 518 if (!strcmp(data, "stop")) 519 pktgen_stop_all_threads(pn); 520 else if (!strcmp(data, "start")) 521 pktgen_run_all_threads(pn); 522 else if (!strcmp(data, "reset")) 523 pktgen_reset_all_threads(pn); 524 else 525 return -EINVAL; 526 527 return count; 528 } 529 530 static int pgctrl_open(struct inode *inode, struct file *file) 531 { 532 return single_open(file, pgctrl_show, PDE_DATA(inode)); 533 } 534 535 static const struct proc_ops pktgen_proc_ops = { 536 .proc_open = pgctrl_open, 537 .proc_read = seq_read, 538 .proc_lseek = seq_lseek, 539 .proc_write = pgctrl_write, 540 .proc_release = single_release, 541 }; 542 543 static int pktgen_if_show(struct seq_file *seq, void *v) 544 { 545 const struct pktgen_dev *pkt_dev = seq->private; 546 ktime_t stopped; 547 unsigned int i; 548 u64 idle; 549 550 seq_printf(seq, 551 "Params: count %llu min_pkt_size: %u max_pkt_size: %u\n", 552 (unsigned long long)pkt_dev->count, pkt_dev->min_pkt_size, 553 pkt_dev->max_pkt_size); 554 555 seq_printf(seq, 556 " frags: %d delay: %llu clone_skb: %d ifname: %s\n", 557 pkt_dev->nfrags, (unsigned long long) pkt_dev->delay, 558 pkt_dev->clone_skb, pkt_dev->odevname); 559 560 seq_printf(seq, " flows: %u flowlen: %u\n", pkt_dev->cflows, 561 pkt_dev->lflow); 562 563 seq_printf(seq, 564 " queue_map_min: %u queue_map_max: %u\n", 565 pkt_dev->queue_map_min, 566 pkt_dev->queue_map_max); 567 568 if (pkt_dev->skb_priority) 569 seq_printf(seq, " skb_priority: %u\n", 570 pkt_dev->skb_priority); 571 572 if (pkt_dev->flags & F_IPV6) { 573 seq_printf(seq, 574 " saddr: %pI6c min_saddr: %pI6c max_saddr: %pI6c\n" 575 " daddr: %pI6c min_daddr: %pI6c max_daddr: %pI6c\n", 576 &pkt_dev->in6_saddr, 577 &pkt_dev->min_in6_saddr, &pkt_dev->max_in6_saddr, 578 &pkt_dev->in6_daddr, 579 &pkt_dev->min_in6_daddr, &pkt_dev->max_in6_daddr); 580 } else { 581 seq_printf(seq, 582 " dst_min: %s dst_max: %s\n", 583 pkt_dev->dst_min, pkt_dev->dst_max); 584 seq_printf(seq, 585 " src_min: %s src_max: %s\n", 586 pkt_dev->src_min, pkt_dev->src_max); 587 } 588 589 seq_puts(seq, " src_mac: "); 590 591 seq_printf(seq, "%pM ", 592 is_zero_ether_addr(pkt_dev->src_mac) ? 593 pkt_dev->odev->dev_addr : pkt_dev->src_mac); 594 595 seq_puts(seq, "dst_mac: "); 596 seq_printf(seq, "%pM\n", pkt_dev->dst_mac); 597 598 seq_printf(seq, 599 " udp_src_min: %d udp_src_max: %d" 600 " udp_dst_min: %d udp_dst_max: %d\n", 601 pkt_dev->udp_src_min, pkt_dev->udp_src_max, 602 pkt_dev->udp_dst_min, pkt_dev->udp_dst_max); 603 604 seq_printf(seq, 605 " src_mac_count: %d dst_mac_count: %d\n", 606 pkt_dev->src_mac_count, pkt_dev->dst_mac_count); 607 608 if (pkt_dev->nr_labels) { 609 seq_puts(seq, " mpls: "); 610 for (i = 0; i < pkt_dev->nr_labels; i++) 611 seq_printf(seq, "%08x%s", ntohl(pkt_dev->labels[i]), 612 i == pkt_dev->nr_labels-1 ? "\n" : ", "); 613 } 614 615 if (pkt_dev->vlan_id != 0xffff) 616 seq_printf(seq, " vlan_id: %u vlan_p: %u vlan_cfi: %u\n", 617 pkt_dev->vlan_id, pkt_dev->vlan_p, 618 pkt_dev->vlan_cfi); 619 620 if (pkt_dev->svlan_id != 0xffff) 621 seq_printf(seq, " svlan_id: %u vlan_p: %u vlan_cfi: %u\n", 622 pkt_dev->svlan_id, pkt_dev->svlan_p, 623 pkt_dev->svlan_cfi); 624 625 if (pkt_dev->tos) 626 seq_printf(seq, " tos: 0x%02x\n", pkt_dev->tos); 627 628 if (pkt_dev->traffic_class) 629 seq_printf(seq, " traffic_class: 0x%02x\n", pkt_dev->traffic_class); 630 631 if (pkt_dev->burst > 1) 632 seq_printf(seq, " burst: %d\n", pkt_dev->burst); 633 634 if (pkt_dev->node >= 0) 635 seq_printf(seq, " node: %d\n", pkt_dev->node); 636 637 if (pkt_dev->xmit_mode == M_NETIF_RECEIVE) 638 seq_puts(seq, " xmit_mode: netif_receive\n"); 639 else if (pkt_dev->xmit_mode == M_QUEUE_XMIT) 640 seq_puts(seq, " xmit_mode: xmit_queue\n"); 641 642 seq_puts(seq, " Flags: "); 643 644 for (i = 0; i < NR_PKT_FLAGS; i++) { 645 if (i == F_FLOW_SEQ) 646 if (!pkt_dev->cflows) 647 continue; 648 649 if (pkt_dev->flags & (1 << i)) 650 seq_printf(seq, "%s ", pkt_flag_names[i]); 651 else if (i == F_FLOW_SEQ) 652 seq_puts(seq, "FLOW_RND "); 653 654 #ifdef CONFIG_XFRM 655 if (i == F_IPSEC && pkt_dev->spi) 656 seq_printf(seq, "spi:%u", pkt_dev->spi); 657 #endif 658 } 659 660 seq_puts(seq, "\n"); 661 662 /* not really stopped, more like last-running-at */ 663 stopped = pkt_dev->running ? ktime_get() : pkt_dev->stopped_at; 664 idle = pkt_dev->idle_acc; 665 do_div(idle, NSEC_PER_USEC); 666 667 seq_printf(seq, 668 "Current:\n pkts-sofar: %llu errors: %llu\n", 669 (unsigned long long)pkt_dev->sofar, 670 (unsigned long long)pkt_dev->errors); 671 672 seq_printf(seq, 673 " started: %lluus stopped: %lluus idle: %lluus\n", 674 (unsigned long long) ktime_to_us(pkt_dev->started_at), 675 (unsigned long long) ktime_to_us(stopped), 676 (unsigned long long) idle); 677 678 seq_printf(seq, 679 " seq_num: %d cur_dst_mac_offset: %d cur_src_mac_offset: %d\n", 680 pkt_dev->seq_num, pkt_dev->cur_dst_mac_offset, 681 pkt_dev->cur_src_mac_offset); 682 683 if (pkt_dev->flags & F_IPV6) { 684 seq_printf(seq, " cur_saddr: %pI6c cur_daddr: %pI6c\n", 685 &pkt_dev->cur_in6_saddr, 686 &pkt_dev->cur_in6_daddr); 687 } else 688 seq_printf(seq, " cur_saddr: %pI4 cur_daddr: %pI4\n", 689 &pkt_dev->cur_saddr, &pkt_dev->cur_daddr); 690 691 seq_printf(seq, " cur_udp_dst: %d cur_udp_src: %d\n", 692 pkt_dev->cur_udp_dst, pkt_dev->cur_udp_src); 693 694 seq_printf(seq, " cur_queue_map: %u\n", pkt_dev->cur_queue_map); 695 696 seq_printf(seq, " flows: %u\n", pkt_dev->nflows); 697 698 if (pkt_dev->result[0]) 699 seq_printf(seq, "Result: %s\n", pkt_dev->result); 700 else 701 seq_puts(seq, "Result: Idle\n"); 702 703 return 0; 704 } 705 706 707 static int hex32_arg(const char __user *user_buffer, unsigned long maxlen, 708 __u32 *num) 709 { 710 int i = 0; 711 *num = 0; 712 713 for (; i < maxlen; i++) { 714 int value; 715 char c; 716 *num <<= 4; 717 if (get_user(c, &user_buffer[i])) 718 return -EFAULT; 719 value = hex_to_bin(c); 720 if (value >= 0) 721 *num |= value; 722 else 723 break; 724 } 725 return i; 726 } 727 728 static int count_trail_chars(const char __user * user_buffer, 729 unsigned int maxlen) 730 { 731 int i; 732 733 for (i = 0; i < maxlen; i++) { 734 char c; 735 if (get_user(c, &user_buffer[i])) 736 return -EFAULT; 737 switch (c) { 738 case '\"': 739 case '\n': 740 case '\r': 741 case '\t': 742 case ' ': 743 case '=': 744 break; 745 default: 746 goto done; 747 } 748 } 749 done: 750 return i; 751 } 752 753 static long num_arg(const char __user *user_buffer, unsigned long maxlen, 754 unsigned long *num) 755 { 756 int i; 757 *num = 0; 758 759 for (i = 0; i < maxlen; i++) { 760 char c; 761 if (get_user(c, &user_buffer[i])) 762 return -EFAULT; 763 if ((c >= '0') && (c <= '9')) { 764 *num *= 10; 765 *num += c - '0'; 766 } else 767 break; 768 } 769 return i; 770 } 771 772 static int strn_len(const char __user * user_buffer, unsigned int maxlen) 773 { 774 int i; 775 776 for (i = 0; i < maxlen; i++) { 777 char c; 778 if (get_user(c, &user_buffer[i])) 779 return -EFAULT; 780 switch (c) { 781 case '\"': 782 case '\n': 783 case '\r': 784 case '\t': 785 case ' ': 786 goto done_str; 787 default: 788 break; 789 } 790 } 791 done_str: 792 return i; 793 } 794 795 static ssize_t get_labels(const char __user *buffer, struct pktgen_dev *pkt_dev) 796 { 797 unsigned int n = 0; 798 char c; 799 ssize_t i = 0; 800 int len; 801 802 pkt_dev->nr_labels = 0; 803 do { 804 __u32 tmp; 805 len = hex32_arg(&buffer[i], 8, &tmp); 806 if (len <= 0) 807 return len; 808 pkt_dev->labels[n] = htonl(tmp); 809 if (pkt_dev->labels[n] & MPLS_STACK_BOTTOM) 810 pkt_dev->flags |= F_MPLS_RND; 811 i += len; 812 if (get_user(c, &buffer[i])) 813 return -EFAULT; 814 i++; 815 n++; 816 if (n >= MAX_MPLS_LABELS) 817 return -E2BIG; 818 } while (c == ','); 819 820 pkt_dev->nr_labels = n; 821 return i; 822 } 823 824 static __u32 pktgen_read_flag(const char *f, bool *disable) 825 { 826 __u32 i; 827 828 if (f[0] == '!') { 829 *disable = true; 830 f++; 831 } 832 833 for (i = 0; i < NR_PKT_FLAGS; i++) { 834 if (!IS_ENABLED(CONFIG_XFRM) && i == IPSEC_SHIFT) 835 continue; 836 837 /* allow only disabling ipv6 flag */ 838 if (!*disable && i == IPV6_SHIFT) 839 continue; 840 841 if (strcmp(f, pkt_flag_names[i]) == 0) 842 return 1 << i; 843 } 844 845 if (strcmp(f, "FLOW_RND") == 0) { 846 *disable = !*disable; 847 return F_FLOW_SEQ; 848 } 849 850 return 0; 851 } 852 853 static ssize_t pktgen_if_write(struct file *file, 854 const char __user * user_buffer, size_t count, 855 loff_t * offset) 856 { 857 struct seq_file *seq = file->private_data; 858 struct pktgen_dev *pkt_dev = seq->private; 859 int i, max, len; 860 char name[16], valstr[32]; 861 unsigned long value = 0; 862 char *pg_result = NULL; 863 int tmp = 0; 864 char buf[128]; 865 866 pg_result = &(pkt_dev->result[0]); 867 868 if (count < 1) { 869 pr_warn("wrong command format\n"); 870 return -EINVAL; 871 } 872 873 max = count; 874 tmp = count_trail_chars(user_buffer, max); 875 if (tmp < 0) { 876 pr_warn("illegal format\n"); 877 return tmp; 878 } 879 i = tmp; 880 881 /* Read variable name */ 882 883 len = strn_len(&user_buffer[i], sizeof(name) - 1); 884 if (len < 0) 885 return len; 886 887 memset(name, 0, sizeof(name)); 888 if (copy_from_user(name, &user_buffer[i], len)) 889 return -EFAULT; 890 i += len; 891 892 max = count - i; 893 len = count_trail_chars(&user_buffer[i], max); 894 if (len < 0) 895 return len; 896 897 i += len; 898 899 if (debug) { 900 size_t copy = min_t(size_t, count + 1, 1024); 901 char *tp = strndup_user(user_buffer, copy); 902 903 if (IS_ERR(tp)) 904 return PTR_ERR(tp); 905 906 pr_debug("%s,%zu buffer -:%s:-\n", name, count, tp); 907 kfree(tp); 908 } 909 910 if (!strcmp(name, "min_pkt_size")) { 911 len = num_arg(&user_buffer[i], 10, &value); 912 if (len < 0) 913 return len; 914 915 i += len; 916 if (value < 14 + 20 + 8) 917 value = 14 + 20 + 8; 918 if (value != pkt_dev->min_pkt_size) { 919 pkt_dev->min_pkt_size = value; 920 pkt_dev->cur_pkt_size = value; 921 } 922 sprintf(pg_result, "OK: min_pkt_size=%d", 923 pkt_dev->min_pkt_size); 924 return count; 925 } 926 927 if (!strcmp(name, "max_pkt_size")) { 928 len = num_arg(&user_buffer[i], 10, &value); 929 if (len < 0) 930 return len; 931 932 i += len; 933 if (value < 14 + 20 + 8) 934 value = 14 + 20 + 8; 935 if (value != pkt_dev->max_pkt_size) { 936 pkt_dev->max_pkt_size = value; 937 pkt_dev->cur_pkt_size = value; 938 } 939 sprintf(pg_result, "OK: max_pkt_size=%d", 940 pkt_dev->max_pkt_size); 941 return count; 942 } 943 944 /* Shortcut for min = max */ 945 946 if (!strcmp(name, "pkt_size")) { 947 len = num_arg(&user_buffer[i], 10, &value); 948 if (len < 0) 949 return len; 950 951 i += len; 952 if (value < 14 + 20 + 8) 953 value = 14 + 20 + 8; 954 if (value != pkt_dev->min_pkt_size) { 955 pkt_dev->min_pkt_size = value; 956 pkt_dev->max_pkt_size = value; 957 pkt_dev->cur_pkt_size = value; 958 } 959 sprintf(pg_result, "OK: pkt_size=%d", pkt_dev->min_pkt_size); 960 return count; 961 } 962 963 if (!strcmp(name, "debug")) { 964 len = num_arg(&user_buffer[i], 10, &value); 965 if (len < 0) 966 return len; 967 968 i += len; 969 debug = value; 970 sprintf(pg_result, "OK: debug=%u", debug); 971 return count; 972 } 973 974 if (!strcmp(name, "frags")) { 975 len = num_arg(&user_buffer[i], 10, &value); 976 if (len < 0) 977 return len; 978 979 i += len; 980 pkt_dev->nfrags = value; 981 sprintf(pg_result, "OK: frags=%d", pkt_dev->nfrags); 982 return count; 983 } 984 if (!strcmp(name, "delay")) { 985 len = num_arg(&user_buffer[i], 10, &value); 986 if (len < 0) 987 return len; 988 989 i += len; 990 if (value == 0x7FFFFFFF) 991 pkt_dev->delay = ULLONG_MAX; 992 else 993 pkt_dev->delay = (u64)value; 994 995 sprintf(pg_result, "OK: delay=%llu", 996 (unsigned long long) pkt_dev->delay); 997 return count; 998 } 999 if (!strcmp(name, "rate")) { 1000 len = num_arg(&user_buffer[i], 10, &value); 1001 if (len < 0) 1002 return len; 1003 1004 i += len; 1005 if (!value) 1006 return len; 1007 pkt_dev->delay = pkt_dev->min_pkt_size*8*NSEC_PER_USEC/value; 1008 if (debug) 1009 pr_info("Delay set at: %llu ns\n", pkt_dev->delay); 1010 1011 sprintf(pg_result, "OK: rate=%lu", value); 1012 return count; 1013 } 1014 if (!strcmp(name, "ratep")) { 1015 len = num_arg(&user_buffer[i], 10, &value); 1016 if (len < 0) 1017 return len; 1018 1019 i += len; 1020 if (!value) 1021 return len; 1022 pkt_dev->delay = NSEC_PER_SEC/value; 1023 if (debug) 1024 pr_info("Delay set at: %llu ns\n", pkt_dev->delay); 1025 1026 sprintf(pg_result, "OK: rate=%lu", value); 1027 return count; 1028 } 1029 if (!strcmp(name, "udp_src_min")) { 1030 len = num_arg(&user_buffer[i], 10, &value); 1031 if (len < 0) 1032 return len; 1033 1034 i += len; 1035 if (value != pkt_dev->udp_src_min) { 1036 pkt_dev->udp_src_min = value; 1037 pkt_dev->cur_udp_src = value; 1038 } 1039 sprintf(pg_result, "OK: udp_src_min=%u", pkt_dev->udp_src_min); 1040 return count; 1041 } 1042 if (!strcmp(name, "udp_dst_min")) { 1043 len = num_arg(&user_buffer[i], 10, &value); 1044 if (len < 0) 1045 return len; 1046 1047 i += len; 1048 if (value != pkt_dev->udp_dst_min) { 1049 pkt_dev->udp_dst_min = value; 1050 pkt_dev->cur_udp_dst = value; 1051 } 1052 sprintf(pg_result, "OK: udp_dst_min=%u", pkt_dev->udp_dst_min); 1053 return count; 1054 } 1055 if (!strcmp(name, "udp_src_max")) { 1056 len = num_arg(&user_buffer[i], 10, &value); 1057 if (len < 0) 1058 return len; 1059 1060 i += len; 1061 if (value != pkt_dev->udp_src_max) { 1062 pkt_dev->udp_src_max = value; 1063 pkt_dev->cur_udp_src = value; 1064 } 1065 sprintf(pg_result, "OK: udp_src_max=%u", pkt_dev->udp_src_max); 1066 return count; 1067 } 1068 if (!strcmp(name, "udp_dst_max")) { 1069 len = num_arg(&user_buffer[i], 10, &value); 1070 if (len < 0) 1071 return len; 1072 1073 i += len; 1074 if (value != pkt_dev->udp_dst_max) { 1075 pkt_dev->udp_dst_max = value; 1076 pkt_dev->cur_udp_dst = value; 1077 } 1078 sprintf(pg_result, "OK: udp_dst_max=%u", pkt_dev->udp_dst_max); 1079 return count; 1080 } 1081 if (!strcmp(name, "clone_skb")) { 1082 len = num_arg(&user_buffer[i], 10, &value); 1083 if (len < 0) 1084 return len; 1085 if ((value > 0) && 1086 ((pkt_dev->xmit_mode == M_NETIF_RECEIVE) || 1087 !(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING))) 1088 return -ENOTSUPP; 1089 i += len; 1090 pkt_dev->clone_skb = value; 1091 1092 sprintf(pg_result, "OK: clone_skb=%d", pkt_dev->clone_skb); 1093 return count; 1094 } 1095 if (!strcmp(name, "count")) { 1096 len = num_arg(&user_buffer[i], 10, &value); 1097 if (len < 0) 1098 return len; 1099 1100 i += len; 1101 pkt_dev->count = value; 1102 sprintf(pg_result, "OK: count=%llu", 1103 (unsigned long long)pkt_dev->count); 1104 return count; 1105 } 1106 if (!strcmp(name, "src_mac_count")) { 1107 len = num_arg(&user_buffer[i], 10, &value); 1108 if (len < 0) 1109 return len; 1110 1111 i += len; 1112 if (pkt_dev->src_mac_count != value) { 1113 pkt_dev->src_mac_count = value; 1114 pkt_dev->cur_src_mac_offset = 0; 1115 } 1116 sprintf(pg_result, "OK: src_mac_count=%d", 1117 pkt_dev->src_mac_count); 1118 return count; 1119 } 1120 if (!strcmp(name, "dst_mac_count")) { 1121 len = num_arg(&user_buffer[i], 10, &value); 1122 if (len < 0) 1123 return len; 1124 1125 i += len; 1126 if (pkt_dev->dst_mac_count != value) { 1127 pkt_dev->dst_mac_count = value; 1128 pkt_dev->cur_dst_mac_offset = 0; 1129 } 1130 sprintf(pg_result, "OK: dst_mac_count=%d", 1131 pkt_dev->dst_mac_count); 1132 return count; 1133 } 1134 if (!strcmp(name, "burst")) { 1135 len = num_arg(&user_buffer[i], 10, &value); 1136 if (len < 0) 1137 return len; 1138 1139 i += len; 1140 if ((value > 1) && 1141 ((pkt_dev->xmit_mode == M_QUEUE_XMIT) || 1142 ((pkt_dev->xmit_mode == M_START_XMIT) && 1143 (!(pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING))))) 1144 return -ENOTSUPP; 1145 pkt_dev->burst = value < 1 ? 1 : value; 1146 sprintf(pg_result, "OK: burst=%u", pkt_dev->burst); 1147 return count; 1148 } 1149 if (!strcmp(name, "node")) { 1150 len = num_arg(&user_buffer[i], 10, &value); 1151 if (len < 0) 1152 return len; 1153 1154 i += len; 1155 1156 if (node_possible(value)) { 1157 pkt_dev->node = value; 1158 sprintf(pg_result, "OK: node=%d", pkt_dev->node); 1159 if (pkt_dev->page) { 1160 put_page(pkt_dev->page); 1161 pkt_dev->page = NULL; 1162 } 1163 } 1164 else 1165 sprintf(pg_result, "ERROR: node not possible"); 1166 return count; 1167 } 1168 if (!strcmp(name, "xmit_mode")) { 1169 char f[32]; 1170 1171 memset(f, 0, 32); 1172 len = strn_len(&user_buffer[i], sizeof(f) - 1); 1173 if (len < 0) 1174 return len; 1175 1176 if (copy_from_user(f, &user_buffer[i], len)) 1177 return -EFAULT; 1178 i += len; 1179 1180 if (strcmp(f, "start_xmit") == 0) { 1181 pkt_dev->xmit_mode = M_START_XMIT; 1182 } else if (strcmp(f, "netif_receive") == 0) { 1183 /* clone_skb set earlier, not supported in this mode */ 1184 if (pkt_dev->clone_skb > 0) 1185 return -ENOTSUPP; 1186 1187 pkt_dev->xmit_mode = M_NETIF_RECEIVE; 1188 1189 /* make sure new packet is allocated every time 1190 * pktgen_xmit() is called 1191 */ 1192 pkt_dev->last_ok = 1; 1193 1194 /* override clone_skb if user passed default value 1195 * at module loading time 1196 */ 1197 pkt_dev->clone_skb = 0; 1198 } else if (strcmp(f, "queue_xmit") == 0) { 1199 pkt_dev->xmit_mode = M_QUEUE_XMIT; 1200 pkt_dev->last_ok = 1; 1201 } else { 1202 sprintf(pg_result, 1203 "xmit_mode -:%s:- unknown\nAvailable modes: %s", 1204 f, "start_xmit, netif_receive\n"); 1205 return count; 1206 } 1207 sprintf(pg_result, "OK: xmit_mode=%s", f); 1208 return count; 1209 } 1210 if (!strcmp(name, "flag")) { 1211 __u32 flag; 1212 char f[32]; 1213 bool disable = false; 1214 1215 memset(f, 0, 32); 1216 len = strn_len(&user_buffer[i], sizeof(f) - 1); 1217 if (len < 0) 1218 return len; 1219 1220 if (copy_from_user(f, &user_buffer[i], len)) 1221 return -EFAULT; 1222 i += len; 1223 1224 flag = pktgen_read_flag(f, &disable); 1225 1226 if (flag) { 1227 if (disable) 1228 pkt_dev->flags &= ~flag; 1229 else 1230 pkt_dev->flags |= flag; 1231 } else { 1232 sprintf(pg_result, 1233 "Flag -:%s:- unknown\nAvailable flags, (prepend ! to un-set flag):\n%s", 1234 f, 1235 "IPSRC_RND, IPDST_RND, UDPSRC_RND, UDPDST_RND, " 1236 "MACSRC_RND, MACDST_RND, TXSIZE_RND, IPV6, " 1237 "MPLS_RND, VID_RND, SVID_RND, FLOW_SEQ, " 1238 "QUEUE_MAP_RND, QUEUE_MAP_CPU, UDPCSUM, " 1239 "NO_TIMESTAMP, " 1240 #ifdef CONFIG_XFRM 1241 "IPSEC, " 1242 #endif 1243 "NODE_ALLOC\n"); 1244 return count; 1245 } 1246 sprintf(pg_result, "OK: flags=0x%x", pkt_dev->flags); 1247 return count; 1248 } 1249 if (!strcmp(name, "dst_min") || !strcmp(name, "dst")) { 1250 len = strn_len(&user_buffer[i], sizeof(pkt_dev->dst_min) - 1); 1251 if (len < 0) 1252 return len; 1253 1254 if (copy_from_user(buf, &user_buffer[i], len)) 1255 return -EFAULT; 1256 buf[len] = 0; 1257 if (strcmp(buf, pkt_dev->dst_min) != 0) { 1258 memset(pkt_dev->dst_min, 0, sizeof(pkt_dev->dst_min)); 1259 strcpy(pkt_dev->dst_min, buf); 1260 pkt_dev->daddr_min = in_aton(pkt_dev->dst_min); 1261 pkt_dev->cur_daddr = pkt_dev->daddr_min; 1262 } 1263 if (debug) 1264 pr_debug("dst_min set to: %s\n", pkt_dev->dst_min); 1265 i += len; 1266 sprintf(pg_result, "OK: dst_min=%s", pkt_dev->dst_min); 1267 return count; 1268 } 1269 if (!strcmp(name, "dst_max")) { 1270 len = strn_len(&user_buffer[i], sizeof(pkt_dev->dst_max) - 1); 1271 if (len < 0) 1272 return len; 1273 1274 if (copy_from_user(buf, &user_buffer[i], len)) 1275 return -EFAULT; 1276 buf[len] = 0; 1277 if (strcmp(buf, pkt_dev->dst_max) != 0) { 1278 memset(pkt_dev->dst_max, 0, sizeof(pkt_dev->dst_max)); 1279 strcpy(pkt_dev->dst_max, buf); 1280 pkt_dev->daddr_max = in_aton(pkt_dev->dst_max); 1281 pkt_dev->cur_daddr = pkt_dev->daddr_max; 1282 } 1283 if (debug) 1284 pr_debug("dst_max set to: %s\n", pkt_dev->dst_max); 1285 i += len; 1286 sprintf(pg_result, "OK: dst_max=%s", pkt_dev->dst_max); 1287 return count; 1288 } 1289 if (!strcmp(name, "dst6")) { 1290 len = strn_len(&user_buffer[i], sizeof(buf) - 1); 1291 if (len < 0) 1292 return len; 1293 1294 pkt_dev->flags |= F_IPV6; 1295 1296 if (copy_from_user(buf, &user_buffer[i], len)) 1297 return -EFAULT; 1298 buf[len] = 0; 1299 1300 in6_pton(buf, -1, pkt_dev->in6_daddr.s6_addr, -1, NULL); 1301 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->in6_daddr); 1302 1303 pkt_dev->cur_in6_daddr = pkt_dev->in6_daddr; 1304 1305 if (debug) 1306 pr_debug("dst6 set to: %s\n", buf); 1307 1308 i += len; 1309 sprintf(pg_result, "OK: dst6=%s", buf); 1310 return count; 1311 } 1312 if (!strcmp(name, "dst6_min")) { 1313 len = strn_len(&user_buffer[i], sizeof(buf) - 1); 1314 if (len < 0) 1315 return len; 1316 1317 pkt_dev->flags |= F_IPV6; 1318 1319 if (copy_from_user(buf, &user_buffer[i], len)) 1320 return -EFAULT; 1321 buf[len] = 0; 1322 1323 in6_pton(buf, -1, pkt_dev->min_in6_daddr.s6_addr, -1, NULL); 1324 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->min_in6_daddr); 1325 1326 pkt_dev->cur_in6_daddr = pkt_dev->min_in6_daddr; 1327 if (debug) 1328 pr_debug("dst6_min set to: %s\n", buf); 1329 1330 i += len; 1331 sprintf(pg_result, "OK: dst6_min=%s", buf); 1332 return count; 1333 } 1334 if (!strcmp(name, "dst6_max")) { 1335 len = strn_len(&user_buffer[i], sizeof(buf) - 1); 1336 if (len < 0) 1337 return len; 1338 1339 pkt_dev->flags |= F_IPV6; 1340 1341 if (copy_from_user(buf, &user_buffer[i], len)) 1342 return -EFAULT; 1343 buf[len] = 0; 1344 1345 in6_pton(buf, -1, pkt_dev->max_in6_daddr.s6_addr, -1, NULL); 1346 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->max_in6_daddr); 1347 1348 if (debug) 1349 pr_debug("dst6_max set to: %s\n", buf); 1350 1351 i += len; 1352 sprintf(pg_result, "OK: dst6_max=%s", buf); 1353 return count; 1354 } 1355 if (!strcmp(name, "src6")) { 1356 len = strn_len(&user_buffer[i], sizeof(buf) - 1); 1357 if (len < 0) 1358 return len; 1359 1360 pkt_dev->flags |= F_IPV6; 1361 1362 if (copy_from_user(buf, &user_buffer[i], len)) 1363 return -EFAULT; 1364 buf[len] = 0; 1365 1366 in6_pton(buf, -1, pkt_dev->in6_saddr.s6_addr, -1, NULL); 1367 snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->in6_saddr); 1368 1369 pkt_dev->cur_in6_saddr = pkt_dev->in6_saddr; 1370 1371 if (debug) 1372 pr_debug("src6 set to: %s\n", buf); 1373 1374 i += len; 1375 sprintf(pg_result, "OK: src6=%s", buf); 1376 return count; 1377 } 1378 if (!strcmp(name, "src_min")) { 1379 len = strn_len(&user_buffer[i], sizeof(pkt_dev->src_min) - 1); 1380 if (len < 0) 1381 return len; 1382 1383 if (copy_from_user(buf, &user_buffer[i], len)) 1384 return -EFAULT; 1385 buf[len] = 0; 1386 if (strcmp(buf, pkt_dev->src_min) != 0) { 1387 memset(pkt_dev->src_min, 0, sizeof(pkt_dev->src_min)); 1388 strcpy(pkt_dev->src_min, buf); 1389 pkt_dev->saddr_min = in_aton(pkt_dev->src_min); 1390 pkt_dev->cur_saddr = pkt_dev->saddr_min; 1391 } 1392 if (debug) 1393 pr_debug("src_min set to: %s\n", pkt_dev->src_min); 1394 i += len; 1395 sprintf(pg_result, "OK: src_min=%s", pkt_dev->src_min); 1396 return count; 1397 } 1398 if (!strcmp(name, "src_max")) { 1399 len = strn_len(&user_buffer[i], sizeof(pkt_dev->src_max) - 1); 1400 if (len < 0) 1401 return len; 1402 1403 if (copy_from_user(buf, &user_buffer[i], len)) 1404 return -EFAULT; 1405 buf[len] = 0; 1406 if (strcmp(buf, pkt_dev->src_max) != 0) { 1407 memset(pkt_dev->src_max, 0, sizeof(pkt_dev->src_max)); 1408 strcpy(pkt_dev->src_max, buf); 1409 pkt_dev->saddr_max = in_aton(pkt_dev->src_max); 1410 pkt_dev->cur_saddr = pkt_dev->saddr_max; 1411 } 1412 if (debug) 1413 pr_debug("src_max set to: %s\n", pkt_dev->src_max); 1414 i += len; 1415 sprintf(pg_result, "OK: src_max=%s", pkt_dev->src_max); 1416 return count; 1417 } 1418 if (!strcmp(name, "dst_mac")) { 1419 len = strn_len(&user_buffer[i], sizeof(valstr) - 1); 1420 if (len < 0) 1421 return len; 1422 1423 memset(valstr, 0, sizeof(valstr)); 1424 if (copy_from_user(valstr, &user_buffer[i], len)) 1425 return -EFAULT; 1426 1427 if (!mac_pton(valstr, pkt_dev->dst_mac)) 1428 return -EINVAL; 1429 /* Set up Dest MAC */ 1430 ether_addr_copy(&pkt_dev->hh[0], pkt_dev->dst_mac); 1431 1432 sprintf(pg_result, "OK: dstmac %pM", pkt_dev->dst_mac); 1433 return count; 1434 } 1435 if (!strcmp(name, "src_mac")) { 1436 len = strn_len(&user_buffer[i], sizeof(valstr) - 1); 1437 if (len < 0) 1438 return len; 1439 1440 memset(valstr, 0, sizeof(valstr)); 1441 if (copy_from_user(valstr, &user_buffer[i], len)) 1442 return -EFAULT; 1443 1444 if (!mac_pton(valstr, pkt_dev->src_mac)) 1445 return -EINVAL; 1446 /* Set up Src MAC */ 1447 ether_addr_copy(&pkt_dev->hh[6], pkt_dev->src_mac); 1448 1449 sprintf(pg_result, "OK: srcmac %pM", pkt_dev->src_mac); 1450 return count; 1451 } 1452 1453 if (!strcmp(name, "clear_counters")) { 1454 pktgen_clear_counters(pkt_dev); 1455 sprintf(pg_result, "OK: Clearing counters.\n"); 1456 return count; 1457 } 1458 1459 if (!strcmp(name, "flows")) { 1460 len = num_arg(&user_buffer[i], 10, &value); 1461 if (len < 0) 1462 return len; 1463 1464 i += len; 1465 if (value > MAX_CFLOWS) 1466 value = MAX_CFLOWS; 1467 1468 pkt_dev->cflows = value; 1469 sprintf(pg_result, "OK: flows=%u", pkt_dev->cflows); 1470 return count; 1471 } 1472 #ifdef CONFIG_XFRM 1473 if (!strcmp(name, "spi")) { 1474 len = num_arg(&user_buffer[i], 10, &value); 1475 if (len < 0) 1476 return len; 1477 1478 i += len; 1479 pkt_dev->spi = value; 1480 sprintf(pg_result, "OK: spi=%u", pkt_dev->spi); 1481 return count; 1482 } 1483 #endif 1484 if (!strcmp(name, "flowlen")) { 1485 len = num_arg(&user_buffer[i], 10, &value); 1486 if (len < 0) 1487 return len; 1488 1489 i += len; 1490 pkt_dev->lflow = value; 1491 sprintf(pg_result, "OK: flowlen=%u", pkt_dev->lflow); 1492 return count; 1493 } 1494 1495 if (!strcmp(name, "queue_map_min")) { 1496 len = num_arg(&user_buffer[i], 5, &value); 1497 if (len < 0) 1498 return len; 1499 1500 i += len; 1501 pkt_dev->queue_map_min = value; 1502 sprintf(pg_result, "OK: queue_map_min=%u", pkt_dev->queue_map_min); 1503 return count; 1504 } 1505 1506 if (!strcmp(name, "queue_map_max")) { 1507 len = num_arg(&user_buffer[i], 5, &value); 1508 if (len < 0) 1509 return len; 1510 1511 i += len; 1512 pkt_dev->queue_map_max = value; 1513 sprintf(pg_result, "OK: queue_map_max=%u", pkt_dev->queue_map_max); 1514 return count; 1515 } 1516 1517 if (!strcmp(name, "mpls")) { 1518 unsigned int n, cnt; 1519 1520 len = get_labels(&user_buffer[i], pkt_dev); 1521 if (len < 0) 1522 return len; 1523 i += len; 1524 cnt = sprintf(pg_result, "OK: mpls="); 1525 for (n = 0; n < pkt_dev->nr_labels; n++) 1526 cnt += sprintf(pg_result + cnt, 1527 "%08x%s", ntohl(pkt_dev->labels[n]), 1528 n == pkt_dev->nr_labels-1 ? "" : ","); 1529 1530 if (pkt_dev->nr_labels && pkt_dev->vlan_id != 0xffff) { 1531 pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */ 1532 pkt_dev->svlan_id = 0xffff; 1533 1534 if (debug) 1535 pr_debug("VLAN/SVLAN auto turned off\n"); 1536 } 1537 return count; 1538 } 1539 1540 if (!strcmp(name, "vlan_id")) { 1541 len = num_arg(&user_buffer[i], 4, &value); 1542 if (len < 0) 1543 return len; 1544 1545 i += len; 1546 if (value <= 4095) { 1547 pkt_dev->vlan_id = value; /* turn on VLAN */ 1548 1549 if (debug) 1550 pr_debug("VLAN turned on\n"); 1551 1552 if (debug && pkt_dev->nr_labels) 1553 pr_debug("MPLS auto turned off\n"); 1554 1555 pkt_dev->nr_labels = 0; /* turn off MPLS */ 1556 sprintf(pg_result, "OK: vlan_id=%u", pkt_dev->vlan_id); 1557 } else { 1558 pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */ 1559 pkt_dev->svlan_id = 0xffff; 1560 1561 if (debug) 1562 pr_debug("VLAN/SVLAN turned off\n"); 1563 } 1564 return count; 1565 } 1566 1567 if (!strcmp(name, "vlan_p")) { 1568 len = num_arg(&user_buffer[i], 1, &value); 1569 if (len < 0) 1570 return len; 1571 1572 i += len; 1573 if ((value <= 7) && (pkt_dev->vlan_id != 0xffff)) { 1574 pkt_dev->vlan_p = value; 1575 sprintf(pg_result, "OK: vlan_p=%u", pkt_dev->vlan_p); 1576 } else { 1577 sprintf(pg_result, "ERROR: vlan_p must be 0-7"); 1578 } 1579 return count; 1580 } 1581 1582 if (!strcmp(name, "vlan_cfi")) { 1583 len = num_arg(&user_buffer[i], 1, &value); 1584 if (len < 0) 1585 return len; 1586 1587 i += len; 1588 if ((value <= 1) && (pkt_dev->vlan_id != 0xffff)) { 1589 pkt_dev->vlan_cfi = value; 1590 sprintf(pg_result, "OK: vlan_cfi=%u", pkt_dev->vlan_cfi); 1591 } else { 1592 sprintf(pg_result, "ERROR: vlan_cfi must be 0-1"); 1593 } 1594 return count; 1595 } 1596 1597 if (!strcmp(name, "svlan_id")) { 1598 len = num_arg(&user_buffer[i], 4, &value); 1599 if (len < 0) 1600 return len; 1601 1602 i += len; 1603 if ((value <= 4095) && ((pkt_dev->vlan_id != 0xffff))) { 1604 pkt_dev->svlan_id = value; /* turn on SVLAN */ 1605 1606 if (debug) 1607 pr_debug("SVLAN turned on\n"); 1608 1609 if (debug && pkt_dev->nr_labels) 1610 pr_debug("MPLS auto turned off\n"); 1611 1612 pkt_dev->nr_labels = 0; /* turn off MPLS */ 1613 sprintf(pg_result, "OK: svlan_id=%u", pkt_dev->svlan_id); 1614 } else { 1615 pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */ 1616 pkt_dev->svlan_id = 0xffff; 1617 1618 if (debug) 1619 pr_debug("VLAN/SVLAN turned off\n"); 1620 } 1621 return count; 1622 } 1623 1624 if (!strcmp(name, "svlan_p")) { 1625 len = num_arg(&user_buffer[i], 1, &value); 1626 if (len < 0) 1627 return len; 1628 1629 i += len; 1630 if ((value <= 7) && (pkt_dev->svlan_id != 0xffff)) { 1631 pkt_dev->svlan_p = value; 1632 sprintf(pg_result, "OK: svlan_p=%u", pkt_dev->svlan_p); 1633 } else { 1634 sprintf(pg_result, "ERROR: svlan_p must be 0-7"); 1635 } 1636 return count; 1637 } 1638 1639 if (!strcmp(name, "svlan_cfi")) { 1640 len = num_arg(&user_buffer[i], 1, &value); 1641 if (len < 0) 1642 return len; 1643 1644 i += len; 1645 if ((value <= 1) && (pkt_dev->svlan_id != 0xffff)) { 1646 pkt_dev->svlan_cfi = value; 1647 sprintf(pg_result, "OK: svlan_cfi=%u", pkt_dev->svlan_cfi); 1648 } else { 1649 sprintf(pg_result, "ERROR: svlan_cfi must be 0-1"); 1650 } 1651 return count; 1652 } 1653 1654 if (!strcmp(name, "tos")) { 1655 __u32 tmp_value = 0; 1656 len = hex32_arg(&user_buffer[i], 2, &tmp_value); 1657 if (len < 0) 1658 return len; 1659 1660 i += len; 1661 if (len == 2) { 1662 pkt_dev->tos = tmp_value; 1663 sprintf(pg_result, "OK: tos=0x%02x", pkt_dev->tos); 1664 } else { 1665 sprintf(pg_result, "ERROR: tos must be 00-ff"); 1666 } 1667 return count; 1668 } 1669 1670 if (!strcmp(name, "traffic_class")) { 1671 __u32 tmp_value = 0; 1672 len = hex32_arg(&user_buffer[i], 2, &tmp_value); 1673 if (len < 0) 1674 return len; 1675 1676 i += len; 1677 if (len == 2) { 1678 pkt_dev->traffic_class = tmp_value; 1679 sprintf(pg_result, "OK: traffic_class=0x%02x", pkt_dev->traffic_class); 1680 } else { 1681 sprintf(pg_result, "ERROR: traffic_class must be 00-ff"); 1682 } 1683 return count; 1684 } 1685 1686 if (!strcmp(name, "skb_priority")) { 1687 len = num_arg(&user_buffer[i], 9, &value); 1688 if (len < 0) 1689 return len; 1690 1691 i += len; 1692 pkt_dev->skb_priority = value; 1693 sprintf(pg_result, "OK: skb_priority=%i", 1694 pkt_dev->skb_priority); 1695 return count; 1696 } 1697 1698 sprintf(pkt_dev->result, "No such parameter \"%s\"", name); 1699 return -EINVAL; 1700 } 1701 1702 static int pktgen_if_open(struct inode *inode, struct file *file) 1703 { 1704 return single_open(file, pktgen_if_show, PDE_DATA(inode)); 1705 } 1706 1707 static const struct proc_ops pktgen_if_proc_ops = { 1708 .proc_open = pktgen_if_open, 1709 .proc_read = seq_read, 1710 .proc_lseek = seq_lseek, 1711 .proc_write = pktgen_if_write, 1712 .proc_release = single_release, 1713 }; 1714 1715 static int pktgen_thread_show(struct seq_file *seq, void *v) 1716 { 1717 struct pktgen_thread *t = seq->private; 1718 const struct pktgen_dev *pkt_dev; 1719 1720 BUG_ON(!t); 1721 1722 seq_puts(seq, "Running: "); 1723 1724 rcu_read_lock(); 1725 list_for_each_entry_rcu(pkt_dev, &t->if_list, list) 1726 if (pkt_dev->running) 1727 seq_printf(seq, "%s ", pkt_dev->odevname); 1728 1729 seq_puts(seq, "\nStopped: "); 1730 1731 list_for_each_entry_rcu(pkt_dev, &t->if_list, list) 1732 if (!pkt_dev->running) 1733 seq_printf(seq, "%s ", pkt_dev->odevname); 1734 1735 if (t->result[0]) 1736 seq_printf(seq, "\nResult: %s\n", t->result); 1737 else 1738 seq_puts(seq, "\nResult: NA\n"); 1739 1740 rcu_read_unlock(); 1741 1742 return 0; 1743 } 1744 1745 static ssize_t pktgen_thread_write(struct file *file, 1746 const char __user * user_buffer, 1747 size_t count, loff_t * offset) 1748 { 1749 struct seq_file *seq = file->private_data; 1750 struct pktgen_thread *t = seq->private; 1751 int i, max, len, ret; 1752 char name[40]; 1753 char *pg_result; 1754 1755 if (count < 1) { 1756 // sprintf(pg_result, "Wrong command format"); 1757 return -EINVAL; 1758 } 1759 1760 max = count; 1761 len = count_trail_chars(user_buffer, max); 1762 if (len < 0) 1763 return len; 1764 1765 i = len; 1766 1767 /* Read variable name */ 1768 1769 len = strn_len(&user_buffer[i], sizeof(name) - 1); 1770 if (len < 0) 1771 return len; 1772 1773 memset(name, 0, sizeof(name)); 1774 if (copy_from_user(name, &user_buffer[i], len)) 1775 return -EFAULT; 1776 i += len; 1777 1778 max = count - i; 1779 len = count_trail_chars(&user_buffer[i], max); 1780 if (len < 0) 1781 return len; 1782 1783 i += len; 1784 1785 if (debug) 1786 pr_debug("t=%s, count=%lu\n", name, (unsigned long)count); 1787 1788 if (!t) { 1789 pr_err("ERROR: No thread\n"); 1790 ret = -EINVAL; 1791 goto out; 1792 } 1793 1794 pg_result = &(t->result[0]); 1795 1796 if (!strcmp(name, "add_device")) { 1797 char f[32]; 1798 memset(f, 0, 32); 1799 len = strn_len(&user_buffer[i], sizeof(f) - 1); 1800 if (len < 0) { 1801 ret = len; 1802 goto out; 1803 } 1804 if (copy_from_user(f, &user_buffer[i], len)) 1805 return -EFAULT; 1806 i += len; 1807 mutex_lock(&pktgen_thread_lock); 1808 ret = pktgen_add_device(t, f); 1809 mutex_unlock(&pktgen_thread_lock); 1810 if (!ret) { 1811 ret = count; 1812 sprintf(pg_result, "OK: add_device=%s", f); 1813 } else 1814 sprintf(pg_result, "ERROR: can not add device %s", f); 1815 goto out; 1816 } 1817 1818 if (!strcmp(name, "rem_device_all")) { 1819 mutex_lock(&pktgen_thread_lock); 1820 t->control |= T_REMDEVALL; 1821 mutex_unlock(&pktgen_thread_lock); 1822 schedule_timeout_interruptible(msecs_to_jiffies(125)); /* Propagate thread->control */ 1823 ret = count; 1824 sprintf(pg_result, "OK: rem_device_all"); 1825 goto out; 1826 } 1827 1828 if (!strcmp(name, "max_before_softirq")) { 1829 sprintf(pg_result, "OK: Note! max_before_softirq is obsoleted -- Do not use"); 1830 ret = count; 1831 goto out; 1832 } 1833 1834 ret = -EINVAL; 1835 out: 1836 return ret; 1837 } 1838 1839 static int pktgen_thread_open(struct inode *inode, struct file *file) 1840 { 1841 return single_open(file, pktgen_thread_show, PDE_DATA(inode)); 1842 } 1843 1844 static const struct proc_ops pktgen_thread_proc_ops = { 1845 .proc_open = pktgen_thread_open, 1846 .proc_read = seq_read, 1847 .proc_lseek = seq_lseek, 1848 .proc_write = pktgen_thread_write, 1849 .proc_release = single_release, 1850 }; 1851 1852 /* Think find or remove for NN */ 1853 static struct pktgen_dev *__pktgen_NN_threads(const struct pktgen_net *pn, 1854 const char *ifname, int remove) 1855 { 1856 struct pktgen_thread *t; 1857 struct pktgen_dev *pkt_dev = NULL; 1858 bool exact = (remove == FIND); 1859 1860 list_for_each_entry(t, &pn->pktgen_threads, th_list) { 1861 pkt_dev = pktgen_find_dev(t, ifname, exact); 1862 if (pkt_dev) { 1863 if (remove) { 1864 pkt_dev->removal_mark = 1; 1865 t->control |= T_REMDEV; 1866 } 1867 break; 1868 } 1869 } 1870 return pkt_dev; 1871 } 1872 1873 /* 1874 * mark a device for removal 1875 */ 1876 static void pktgen_mark_device(const struct pktgen_net *pn, const char *ifname) 1877 { 1878 struct pktgen_dev *pkt_dev = NULL; 1879 const int max_tries = 10, msec_per_try = 125; 1880 int i = 0; 1881 1882 mutex_lock(&pktgen_thread_lock); 1883 pr_debug("%s: marking %s for removal\n", __func__, ifname); 1884 1885 while (1) { 1886 1887 pkt_dev = __pktgen_NN_threads(pn, ifname, REMOVE); 1888 if (pkt_dev == NULL) 1889 break; /* success */ 1890 1891 mutex_unlock(&pktgen_thread_lock); 1892 pr_debug("%s: waiting for %s to disappear....\n", 1893 __func__, ifname); 1894 schedule_timeout_interruptible(msecs_to_jiffies(msec_per_try)); 1895 mutex_lock(&pktgen_thread_lock); 1896 1897 if (++i >= max_tries) { 1898 pr_err("%s: timed out after waiting %d msec for device %s to be removed\n", 1899 __func__, msec_per_try * i, ifname); 1900 break; 1901 } 1902 1903 } 1904 1905 mutex_unlock(&pktgen_thread_lock); 1906 } 1907 1908 static void pktgen_change_name(const struct pktgen_net *pn, struct net_device *dev) 1909 { 1910 struct pktgen_thread *t; 1911 1912 mutex_lock(&pktgen_thread_lock); 1913 1914 list_for_each_entry(t, &pn->pktgen_threads, th_list) { 1915 struct pktgen_dev *pkt_dev; 1916 1917 if_lock(t); 1918 list_for_each_entry(pkt_dev, &t->if_list, list) { 1919 if (pkt_dev->odev != dev) 1920 continue; 1921 1922 proc_remove(pkt_dev->entry); 1923 1924 pkt_dev->entry = proc_create_data(dev->name, 0600, 1925 pn->proc_dir, 1926 &pktgen_if_proc_ops, 1927 pkt_dev); 1928 if (!pkt_dev->entry) 1929 pr_err("can't move proc entry for '%s'\n", 1930 dev->name); 1931 break; 1932 } 1933 if_unlock(t); 1934 } 1935 mutex_unlock(&pktgen_thread_lock); 1936 } 1937 1938 static int pktgen_device_event(struct notifier_block *unused, 1939 unsigned long event, void *ptr) 1940 { 1941 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 1942 struct pktgen_net *pn = net_generic(dev_net(dev), pg_net_id); 1943 1944 if (pn->pktgen_exiting) 1945 return NOTIFY_DONE; 1946 1947 /* It is OK that we do not hold the group lock right now, 1948 * as we run under the RTNL lock. 1949 */ 1950 1951 switch (event) { 1952 case NETDEV_CHANGENAME: 1953 pktgen_change_name(pn, dev); 1954 break; 1955 1956 case NETDEV_UNREGISTER: 1957 pktgen_mark_device(pn, dev->name); 1958 break; 1959 } 1960 1961 return NOTIFY_DONE; 1962 } 1963 1964 static struct net_device *pktgen_dev_get_by_name(const struct pktgen_net *pn, 1965 struct pktgen_dev *pkt_dev, 1966 const char *ifname) 1967 { 1968 char b[IFNAMSIZ+5]; 1969 int i; 1970 1971 for (i = 0; ifname[i] != '@'; i++) { 1972 if (i == IFNAMSIZ) 1973 break; 1974 1975 b[i] = ifname[i]; 1976 } 1977 b[i] = 0; 1978 1979 return dev_get_by_name(pn->net, b); 1980 } 1981 1982 1983 /* Associate pktgen_dev with a device. */ 1984 1985 static int pktgen_setup_dev(const struct pktgen_net *pn, 1986 struct pktgen_dev *pkt_dev, const char *ifname) 1987 { 1988 struct net_device *odev; 1989 int err; 1990 1991 /* Clean old setups */ 1992 if (pkt_dev->odev) { 1993 dev_put(pkt_dev->odev); 1994 pkt_dev->odev = NULL; 1995 } 1996 1997 odev = pktgen_dev_get_by_name(pn, pkt_dev, ifname); 1998 if (!odev) { 1999 pr_err("no such netdevice: \"%s\"\n", ifname); 2000 return -ENODEV; 2001 } 2002 2003 if (odev->type != ARPHRD_ETHER && odev->type != ARPHRD_LOOPBACK) { 2004 pr_err("not an ethernet or loopback device: \"%s\"\n", ifname); 2005 err = -EINVAL; 2006 } else if (!netif_running(odev)) { 2007 pr_err("device is down: \"%s\"\n", ifname); 2008 err = -ENETDOWN; 2009 } else { 2010 pkt_dev->odev = odev; 2011 return 0; 2012 } 2013 2014 dev_put(odev); 2015 return err; 2016 } 2017 2018 /* Read pkt_dev from the interface and set up internal pktgen_dev 2019 * structure to have the right information to create/send packets 2020 */ 2021 static void pktgen_setup_inject(struct pktgen_dev *pkt_dev) 2022 { 2023 int ntxq; 2024 2025 if (!pkt_dev->odev) { 2026 pr_err("ERROR: pkt_dev->odev == NULL in setup_inject\n"); 2027 sprintf(pkt_dev->result, 2028 "ERROR: pkt_dev->odev == NULL in setup_inject.\n"); 2029 return; 2030 } 2031 2032 /* make sure that we don't pick a non-existing transmit queue */ 2033 ntxq = pkt_dev->odev->real_num_tx_queues; 2034 2035 if (ntxq <= pkt_dev->queue_map_min) { 2036 pr_warn("WARNING: Requested queue_map_min (zero-based) (%d) exceeds valid range [0 - %d] for (%d) queues on %s, resetting\n", 2037 pkt_dev->queue_map_min, (ntxq ?: 1) - 1, ntxq, 2038 pkt_dev->odevname); 2039 pkt_dev->queue_map_min = (ntxq ?: 1) - 1; 2040 } 2041 if (pkt_dev->queue_map_max >= ntxq) { 2042 pr_warn("WARNING: Requested queue_map_max (zero-based) (%d) exceeds valid range [0 - %d] for (%d) queues on %s, resetting\n", 2043 pkt_dev->queue_map_max, (ntxq ?: 1) - 1, ntxq, 2044 pkt_dev->odevname); 2045 pkt_dev->queue_map_max = (ntxq ?: 1) - 1; 2046 } 2047 2048 /* Default to the interface's mac if not explicitly set. */ 2049 2050 if (is_zero_ether_addr(pkt_dev->src_mac)) 2051 ether_addr_copy(&(pkt_dev->hh[6]), pkt_dev->odev->dev_addr); 2052 2053 /* Set up Dest MAC */ 2054 ether_addr_copy(&(pkt_dev->hh[0]), pkt_dev->dst_mac); 2055 2056 if (pkt_dev->flags & F_IPV6) { 2057 int i, set = 0, err = 1; 2058 struct inet6_dev *idev; 2059 2060 if (pkt_dev->min_pkt_size == 0) { 2061 pkt_dev->min_pkt_size = 14 + sizeof(struct ipv6hdr) 2062 + sizeof(struct udphdr) 2063 + sizeof(struct pktgen_hdr) 2064 + pkt_dev->pkt_overhead; 2065 } 2066 2067 for (i = 0; i < sizeof(struct in6_addr); i++) 2068 if (pkt_dev->cur_in6_saddr.s6_addr[i]) { 2069 set = 1; 2070 break; 2071 } 2072 2073 if (!set) { 2074 2075 /* 2076 * Use linklevel address if unconfigured. 2077 * 2078 * use ipv6_get_lladdr if/when it's get exported 2079 */ 2080 2081 rcu_read_lock(); 2082 idev = __in6_dev_get(pkt_dev->odev); 2083 if (idev) { 2084 struct inet6_ifaddr *ifp; 2085 2086 read_lock_bh(&idev->lock); 2087 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2088 if ((ifp->scope & IFA_LINK) && 2089 !(ifp->flags & IFA_F_TENTATIVE)) { 2090 pkt_dev->cur_in6_saddr = ifp->addr; 2091 err = 0; 2092 break; 2093 } 2094 } 2095 read_unlock_bh(&idev->lock); 2096 } 2097 rcu_read_unlock(); 2098 if (err) 2099 pr_err("ERROR: IPv6 link address not available\n"); 2100 } 2101 } else { 2102 if (pkt_dev->min_pkt_size == 0) { 2103 pkt_dev->min_pkt_size = 14 + sizeof(struct iphdr) 2104 + sizeof(struct udphdr) 2105 + sizeof(struct pktgen_hdr) 2106 + pkt_dev->pkt_overhead; 2107 } 2108 2109 pkt_dev->saddr_min = 0; 2110 pkt_dev->saddr_max = 0; 2111 if (strlen(pkt_dev->src_min) == 0) { 2112 2113 struct in_device *in_dev; 2114 2115 rcu_read_lock(); 2116 in_dev = __in_dev_get_rcu(pkt_dev->odev); 2117 if (in_dev) { 2118 const struct in_ifaddr *ifa; 2119 2120 ifa = rcu_dereference(in_dev->ifa_list); 2121 if (ifa) { 2122 pkt_dev->saddr_min = ifa->ifa_address; 2123 pkt_dev->saddr_max = pkt_dev->saddr_min; 2124 } 2125 } 2126 rcu_read_unlock(); 2127 } else { 2128 pkt_dev->saddr_min = in_aton(pkt_dev->src_min); 2129 pkt_dev->saddr_max = in_aton(pkt_dev->src_max); 2130 } 2131 2132 pkt_dev->daddr_min = in_aton(pkt_dev->dst_min); 2133 pkt_dev->daddr_max = in_aton(pkt_dev->dst_max); 2134 } 2135 /* Initialize current values. */ 2136 pkt_dev->cur_pkt_size = pkt_dev->min_pkt_size; 2137 if (pkt_dev->min_pkt_size > pkt_dev->max_pkt_size) 2138 pkt_dev->max_pkt_size = pkt_dev->min_pkt_size; 2139 2140 pkt_dev->cur_dst_mac_offset = 0; 2141 pkt_dev->cur_src_mac_offset = 0; 2142 pkt_dev->cur_saddr = pkt_dev->saddr_min; 2143 pkt_dev->cur_daddr = pkt_dev->daddr_min; 2144 pkt_dev->cur_udp_dst = pkt_dev->udp_dst_min; 2145 pkt_dev->cur_udp_src = pkt_dev->udp_src_min; 2146 pkt_dev->nflows = 0; 2147 } 2148 2149 2150 static void spin(struct pktgen_dev *pkt_dev, ktime_t spin_until) 2151 { 2152 ktime_t start_time, end_time; 2153 s64 remaining; 2154 struct hrtimer_sleeper t; 2155 2156 hrtimer_init_sleeper_on_stack(&t, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); 2157 hrtimer_set_expires(&t.timer, spin_until); 2158 2159 remaining = ktime_to_ns(hrtimer_expires_remaining(&t.timer)); 2160 if (remaining <= 0) 2161 goto out; 2162 2163 start_time = ktime_get(); 2164 if (remaining < 100000) { 2165 /* for small delays (<100us), just loop until limit is reached */ 2166 do { 2167 end_time = ktime_get(); 2168 } while (ktime_compare(end_time, spin_until) < 0); 2169 } else { 2170 do { 2171 set_current_state(TASK_INTERRUPTIBLE); 2172 hrtimer_sleeper_start_expires(&t, HRTIMER_MODE_ABS); 2173 2174 if (likely(t.task)) 2175 schedule(); 2176 2177 hrtimer_cancel(&t.timer); 2178 } while (t.task && pkt_dev->running && !signal_pending(current)); 2179 __set_current_state(TASK_RUNNING); 2180 end_time = ktime_get(); 2181 } 2182 2183 pkt_dev->idle_acc += ktime_to_ns(ktime_sub(end_time, start_time)); 2184 out: 2185 pkt_dev->next_tx = ktime_add_ns(spin_until, pkt_dev->delay); 2186 destroy_hrtimer_on_stack(&t.timer); 2187 } 2188 2189 static inline void set_pkt_overhead(struct pktgen_dev *pkt_dev) 2190 { 2191 pkt_dev->pkt_overhead = 0; 2192 pkt_dev->pkt_overhead += pkt_dev->nr_labels*sizeof(u32); 2193 pkt_dev->pkt_overhead += VLAN_TAG_SIZE(pkt_dev); 2194 pkt_dev->pkt_overhead += SVLAN_TAG_SIZE(pkt_dev); 2195 } 2196 2197 static inline int f_seen(const struct pktgen_dev *pkt_dev, int flow) 2198 { 2199 return !!(pkt_dev->flows[flow].flags & F_INIT); 2200 } 2201 2202 static inline int f_pick(struct pktgen_dev *pkt_dev) 2203 { 2204 int flow = pkt_dev->curfl; 2205 2206 if (pkt_dev->flags & F_FLOW_SEQ) { 2207 if (pkt_dev->flows[flow].count >= pkt_dev->lflow) { 2208 /* reset time */ 2209 pkt_dev->flows[flow].count = 0; 2210 pkt_dev->flows[flow].flags = 0; 2211 pkt_dev->curfl += 1; 2212 if (pkt_dev->curfl >= pkt_dev->cflows) 2213 pkt_dev->curfl = 0; /*reset */ 2214 } 2215 } else { 2216 flow = prandom_u32() % pkt_dev->cflows; 2217 pkt_dev->curfl = flow; 2218 2219 if (pkt_dev->flows[flow].count > pkt_dev->lflow) { 2220 pkt_dev->flows[flow].count = 0; 2221 pkt_dev->flows[flow].flags = 0; 2222 } 2223 } 2224 2225 return pkt_dev->curfl; 2226 } 2227 2228 2229 #ifdef CONFIG_XFRM 2230 /* If there was already an IPSEC SA, we keep it as is, else 2231 * we go look for it ... 2232 */ 2233 #define DUMMY_MARK 0 2234 static void get_ipsec_sa(struct pktgen_dev *pkt_dev, int flow) 2235 { 2236 struct xfrm_state *x = pkt_dev->flows[flow].x; 2237 struct pktgen_net *pn = net_generic(dev_net(pkt_dev->odev), pg_net_id); 2238 if (!x) { 2239 2240 if (pkt_dev->spi) { 2241 /* We need as quick as possible to find the right SA 2242 * Searching with minimum criteria to archieve this. 2243 */ 2244 x = xfrm_state_lookup_byspi(pn->net, htonl(pkt_dev->spi), AF_INET); 2245 } else { 2246 /* slow path: we dont already have xfrm_state */ 2247 x = xfrm_stateonly_find(pn->net, DUMMY_MARK, 0, 2248 (xfrm_address_t *)&pkt_dev->cur_daddr, 2249 (xfrm_address_t *)&pkt_dev->cur_saddr, 2250 AF_INET, 2251 pkt_dev->ipsmode, 2252 pkt_dev->ipsproto, 0); 2253 } 2254 if (x) { 2255 pkt_dev->flows[flow].x = x; 2256 set_pkt_overhead(pkt_dev); 2257 pkt_dev->pkt_overhead += x->props.header_len; 2258 } 2259 2260 } 2261 } 2262 #endif 2263 static void set_cur_queue_map(struct pktgen_dev *pkt_dev) 2264 { 2265 2266 if (pkt_dev->flags & F_QUEUE_MAP_CPU) 2267 pkt_dev->cur_queue_map = smp_processor_id(); 2268 2269 else if (pkt_dev->queue_map_min <= pkt_dev->queue_map_max) { 2270 __u16 t; 2271 if (pkt_dev->flags & F_QUEUE_MAP_RND) { 2272 t = prandom_u32() % 2273 (pkt_dev->queue_map_max - 2274 pkt_dev->queue_map_min + 1) 2275 + pkt_dev->queue_map_min; 2276 } else { 2277 t = pkt_dev->cur_queue_map + 1; 2278 if (t > pkt_dev->queue_map_max) 2279 t = pkt_dev->queue_map_min; 2280 } 2281 pkt_dev->cur_queue_map = t; 2282 } 2283 pkt_dev->cur_queue_map = pkt_dev->cur_queue_map % pkt_dev->odev->real_num_tx_queues; 2284 } 2285 2286 /* Increment/randomize headers according to flags and current values 2287 * for IP src/dest, UDP src/dst port, MAC-Addr src/dst 2288 */ 2289 static void mod_cur_headers(struct pktgen_dev *pkt_dev) 2290 { 2291 __u32 imn; 2292 __u32 imx; 2293 int flow = 0; 2294 2295 if (pkt_dev->cflows) 2296 flow = f_pick(pkt_dev); 2297 2298 /* Deal with source MAC */ 2299 if (pkt_dev->src_mac_count > 1) { 2300 __u32 mc; 2301 __u32 tmp; 2302 2303 if (pkt_dev->flags & F_MACSRC_RND) 2304 mc = prandom_u32() % pkt_dev->src_mac_count; 2305 else { 2306 mc = pkt_dev->cur_src_mac_offset++; 2307 if (pkt_dev->cur_src_mac_offset >= 2308 pkt_dev->src_mac_count) 2309 pkt_dev->cur_src_mac_offset = 0; 2310 } 2311 2312 tmp = pkt_dev->src_mac[5] + (mc & 0xFF); 2313 pkt_dev->hh[11] = tmp; 2314 tmp = (pkt_dev->src_mac[4] + ((mc >> 8) & 0xFF) + (tmp >> 8)); 2315 pkt_dev->hh[10] = tmp; 2316 tmp = (pkt_dev->src_mac[3] + ((mc >> 16) & 0xFF) + (tmp >> 8)); 2317 pkt_dev->hh[9] = tmp; 2318 tmp = (pkt_dev->src_mac[2] + ((mc >> 24) & 0xFF) + (tmp >> 8)); 2319 pkt_dev->hh[8] = tmp; 2320 tmp = (pkt_dev->src_mac[1] + (tmp >> 8)); 2321 pkt_dev->hh[7] = tmp; 2322 } 2323 2324 /* Deal with Destination MAC */ 2325 if (pkt_dev->dst_mac_count > 1) { 2326 __u32 mc; 2327 __u32 tmp; 2328 2329 if (pkt_dev->flags & F_MACDST_RND) 2330 mc = prandom_u32() % pkt_dev->dst_mac_count; 2331 2332 else { 2333 mc = pkt_dev->cur_dst_mac_offset++; 2334 if (pkt_dev->cur_dst_mac_offset >= 2335 pkt_dev->dst_mac_count) { 2336 pkt_dev->cur_dst_mac_offset = 0; 2337 } 2338 } 2339 2340 tmp = pkt_dev->dst_mac[5] + (mc & 0xFF); 2341 pkt_dev->hh[5] = tmp; 2342 tmp = (pkt_dev->dst_mac[4] + ((mc >> 8) & 0xFF) + (tmp >> 8)); 2343 pkt_dev->hh[4] = tmp; 2344 tmp = (pkt_dev->dst_mac[3] + ((mc >> 16) & 0xFF) + (tmp >> 8)); 2345 pkt_dev->hh[3] = tmp; 2346 tmp = (pkt_dev->dst_mac[2] + ((mc >> 24) & 0xFF) + (tmp >> 8)); 2347 pkt_dev->hh[2] = tmp; 2348 tmp = (pkt_dev->dst_mac[1] + (tmp >> 8)); 2349 pkt_dev->hh[1] = tmp; 2350 } 2351 2352 if (pkt_dev->flags & F_MPLS_RND) { 2353 unsigned int i; 2354 for (i = 0; i < pkt_dev->nr_labels; i++) 2355 if (pkt_dev->labels[i] & MPLS_STACK_BOTTOM) 2356 pkt_dev->labels[i] = MPLS_STACK_BOTTOM | 2357 ((__force __be32)prandom_u32() & 2358 htonl(0x000fffff)); 2359 } 2360 2361 if ((pkt_dev->flags & F_VID_RND) && (pkt_dev->vlan_id != 0xffff)) { 2362 pkt_dev->vlan_id = prandom_u32() & (4096 - 1); 2363 } 2364 2365 if ((pkt_dev->flags & F_SVID_RND) && (pkt_dev->svlan_id != 0xffff)) { 2366 pkt_dev->svlan_id = prandom_u32() & (4096 - 1); 2367 } 2368 2369 if (pkt_dev->udp_src_min < pkt_dev->udp_src_max) { 2370 if (pkt_dev->flags & F_UDPSRC_RND) 2371 pkt_dev->cur_udp_src = prandom_u32() % 2372 (pkt_dev->udp_src_max - pkt_dev->udp_src_min) 2373 + pkt_dev->udp_src_min; 2374 2375 else { 2376 pkt_dev->cur_udp_src++; 2377 if (pkt_dev->cur_udp_src >= pkt_dev->udp_src_max) 2378 pkt_dev->cur_udp_src = pkt_dev->udp_src_min; 2379 } 2380 } 2381 2382 if (pkt_dev->udp_dst_min < pkt_dev->udp_dst_max) { 2383 if (pkt_dev->flags & F_UDPDST_RND) { 2384 pkt_dev->cur_udp_dst = prandom_u32() % 2385 (pkt_dev->udp_dst_max - pkt_dev->udp_dst_min) 2386 + pkt_dev->udp_dst_min; 2387 } else { 2388 pkt_dev->cur_udp_dst++; 2389 if (pkt_dev->cur_udp_dst >= pkt_dev->udp_dst_max) 2390 pkt_dev->cur_udp_dst = pkt_dev->udp_dst_min; 2391 } 2392 } 2393 2394 if (!(pkt_dev->flags & F_IPV6)) { 2395 2396 imn = ntohl(pkt_dev->saddr_min); 2397 imx = ntohl(pkt_dev->saddr_max); 2398 if (imn < imx) { 2399 __u32 t; 2400 if (pkt_dev->flags & F_IPSRC_RND) 2401 t = prandom_u32() % (imx - imn) + imn; 2402 else { 2403 t = ntohl(pkt_dev->cur_saddr); 2404 t++; 2405 if (t > imx) 2406 t = imn; 2407 2408 } 2409 pkt_dev->cur_saddr = htonl(t); 2410 } 2411 2412 if (pkt_dev->cflows && f_seen(pkt_dev, flow)) { 2413 pkt_dev->cur_daddr = pkt_dev->flows[flow].cur_daddr; 2414 } else { 2415 imn = ntohl(pkt_dev->daddr_min); 2416 imx = ntohl(pkt_dev->daddr_max); 2417 if (imn < imx) { 2418 __u32 t; 2419 __be32 s; 2420 if (pkt_dev->flags & F_IPDST_RND) { 2421 2422 do { 2423 t = prandom_u32() % 2424 (imx - imn) + imn; 2425 s = htonl(t); 2426 } while (ipv4_is_loopback(s) || 2427 ipv4_is_multicast(s) || 2428 ipv4_is_lbcast(s) || 2429 ipv4_is_zeronet(s) || 2430 ipv4_is_local_multicast(s)); 2431 pkt_dev->cur_daddr = s; 2432 } else { 2433 t = ntohl(pkt_dev->cur_daddr); 2434 t++; 2435 if (t > imx) { 2436 t = imn; 2437 } 2438 pkt_dev->cur_daddr = htonl(t); 2439 } 2440 } 2441 if (pkt_dev->cflows) { 2442 pkt_dev->flows[flow].flags |= F_INIT; 2443 pkt_dev->flows[flow].cur_daddr = 2444 pkt_dev->cur_daddr; 2445 #ifdef CONFIG_XFRM 2446 if (pkt_dev->flags & F_IPSEC) 2447 get_ipsec_sa(pkt_dev, flow); 2448 #endif 2449 pkt_dev->nflows++; 2450 } 2451 } 2452 } else { /* IPV6 * */ 2453 2454 if (!ipv6_addr_any(&pkt_dev->min_in6_daddr)) { 2455 int i; 2456 2457 /* Only random destinations yet */ 2458 2459 for (i = 0; i < 4; i++) { 2460 pkt_dev->cur_in6_daddr.s6_addr32[i] = 2461 (((__force __be32)prandom_u32() | 2462 pkt_dev->min_in6_daddr.s6_addr32[i]) & 2463 pkt_dev->max_in6_daddr.s6_addr32[i]); 2464 } 2465 } 2466 } 2467 2468 if (pkt_dev->min_pkt_size < pkt_dev->max_pkt_size) { 2469 __u32 t; 2470 if (pkt_dev->flags & F_TXSIZE_RND) { 2471 t = prandom_u32() % 2472 (pkt_dev->max_pkt_size - pkt_dev->min_pkt_size) 2473 + pkt_dev->min_pkt_size; 2474 } else { 2475 t = pkt_dev->cur_pkt_size + 1; 2476 if (t > pkt_dev->max_pkt_size) 2477 t = pkt_dev->min_pkt_size; 2478 } 2479 pkt_dev->cur_pkt_size = t; 2480 } 2481 2482 set_cur_queue_map(pkt_dev); 2483 2484 pkt_dev->flows[flow].count++; 2485 } 2486 2487 2488 #ifdef CONFIG_XFRM 2489 static u32 pktgen_dst_metrics[RTAX_MAX + 1] = { 2490 2491 [RTAX_HOPLIMIT] = 0x5, /* Set a static hoplimit */ 2492 }; 2493 2494 static int pktgen_output_ipsec(struct sk_buff *skb, struct pktgen_dev *pkt_dev) 2495 { 2496 struct xfrm_state *x = pkt_dev->flows[pkt_dev->curfl].x; 2497 int err = 0; 2498 struct net *net = dev_net(pkt_dev->odev); 2499 2500 if (!x) 2501 return 0; 2502 /* XXX: we dont support tunnel mode for now until 2503 * we resolve the dst issue */ 2504 if ((x->props.mode != XFRM_MODE_TRANSPORT) && (pkt_dev->spi == 0)) 2505 return 0; 2506 2507 /* But when user specify an valid SPI, transformation 2508 * supports both transport/tunnel mode + ESP/AH type. 2509 */ 2510 if ((x->props.mode == XFRM_MODE_TUNNEL) && (pkt_dev->spi != 0)) 2511 skb->_skb_refdst = (unsigned long)&pkt_dev->xdst.u.dst | SKB_DST_NOREF; 2512 2513 rcu_read_lock_bh(); 2514 err = pktgen_xfrm_outer_mode_output(x, skb); 2515 rcu_read_unlock_bh(); 2516 if (err) { 2517 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEMODEERROR); 2518 goto error; 2519 } 2520 err = x->type->output(x, skb); 2521 if (err) { 2522 XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEPROTOERROR); 2523 goto error; 2524 } 2525 spin_lock_bh(&x->lock); 2526 x->curlft.bytes += skb->len; 2527 x->curlft.packets++; 2528 spin_unlock_bh(&x->lock); 2529 error: 2530 return err; 2531 } 2532 2533 static void free_SAs(struct pktgen_dev *pkt_dev) 2534 { 2535 if (pkt_dev->cflows) { 2536 /* let go of the SAs if we have them */ 2537 int i; 2538 for (i = 0; i < pkt_dev->cflows; i++) { 2539 struct xfrm_state *x = pkt_dev->flows[i].x; 2540 if (x) { 2541 xfrm_state_put(x); 2542 pkt_dev->flows[i].x = NULL; 2543 } 2544 } 2545 } 2546 } 2547 2548 static int process_ipsec(struct pktgen_dev *pkt_dev, 2549 struct sk_buff *skb, __be16 protocol) 2550 { 2551 if (pkt_dev->flags & F_IPSEC) { 2552 struct xfrm_state *x = pkt_dev->flows[pkt_dev->curfl].x; 2553 int nhead = 0; 2554 if (x) { 2555 struct ethhdr *eth; 2556 struct iphdr *iph; 2557 int ret; 2558 2559 nhead = x->props.header_len - skb_headroom(skb); 2560 if (nhead > 0) { 2561 ret = pskb_expand_head(skb, nhead, 0, GFP_ATOMIC); 2562 if (ret < 0) { 2563 pr_err("Error expanding ipsec packet %d\n", 2564 ret); 2565 goto err; 2566 } 2567 } 2568 2569 /* ipsec is not expecting ll header */ 2570 skb_pull(skb, ETH_HLEN); 2571 ret = pktgen_output_ipsec(skb, pkt_dev); 2572 if (ret) { 2573 pr_err("Error creating ipsec packet %d\n", ret); 2574 goto err; 2575 } 2576 /* restore ll */ 2577 eth = skb_push(skb, ETH_HLEN); 2578 memcpy(eth, pkt_dev->hh, 2 * ETH_ALEN); 2579 eth->h_proto = protocol; 2580 2581 /* Update IPv4 header len as well as checksum value */ 2582 iph = ip_hdr(skb); 2583 iph->tot_len = htons(skb->len - ETH_HLEN); 2584 ip_send_check(iph); 2585 } 2586 } 2587 return 1; 2588 err: 2589 kfree_skb(skb); 2590 return 0; 2591 } 2592 #endif 2593 2594 static void mpls_push(__be32 *mpls, struct pktgen_dev *pkt_dev) 2595 { 2596 unsigned int i; 2597 for (i = 0; i < pkt_dev->nr_labels; i++) 2598 *mpls++ = pkt_dev->labels[i] & ~MPLS_STACK_BOTTOM; 2599 2600 mpls--; 2601 *mpls |= MPLS_STACK_BOTTOM; 2602 } 2603 2604 static inline __be16 build_tci(unsigned int id, unsigned int cfi, 2605 unsigned int prio) 2606 { 2607 return htons(id | (cfi << 12) | (prio << 13)); 2608 } 2609 2610 static void pktgen_finalize_skb(struct pktgen_dev *pkt_dev, struct sk_buff *skb, 2611 int datalen) 2612 { 2613 struct timespec64 timestamp; 2614 struct pktgen_hdr *pgh; 2615 2616 pgh = skb_put(skb, sizeof(*pgh)); 2617 datalen -= sizeof(*pgh); 2618 2619 if (pkt_dev->nfrags <= 0) { 2620 skb_put_zero(skb, datalen); 2621 } else { 2622 int frags = pkt_dev->nfrags; 2623 int i, len; 2624 int frag_len; 2625 2626 2627 if (frags > MAX_SKB_FRAGS) 2628 frags = MAX_SKB_FRAGS; 2629 len = datalen - frags * PAGE_SIZE; 2630 if (len > 0) { 2631 skb_put_zero(skb, len); 2632 datalen = frags * PAGE_SIZE; 2633 } 2634 2635 i = 0; 2636 frag_len = (datalen/frags) < PAGE_SIZE ? 2637 (datalen/frags) : PAGE_SIZE; 2638 while (datalen > 0) { 2639 if (unlikely(!pkt_dev->page)) { 2640 int node = numa_node_id(); 2641 2642 if (pkt_dev->node >= 0 && (pkt_dev->flags & F_NODE)) 2643 node = pkt_dev->node; 2644 pkt_dev->page = alloc_pages_node(node, GFP_KERNEL | __GFP_ZERO, 0); 2645 if (!pkt_dev->page) 2646 break; 2647 } 2648 get_page(pkt_dev->page); 2649 skb_frag_set_page(skb, i, pkt_dev->page); 2650 skb_frag_off_set(&skb_shinfo(skb)->frags[i], 0); 2651 /*last fragment, fill rest of data*/ 2652 if (i == (frags - 1)) 2653 skb_frag_size_set(&skb_shinfo(skb)->frags[i], 2654 (datalen < PAGE_SIZE ? datalen : PAGE_SIZE)); 2655 else 2656 skb_frag_size_set(&skb_shinfo(skb)->frags[i], frag_len); 2657 datalen -= skb_frag_size(&skb_shinfo(skb)->frags[i]); 2658 skb->len += skb_frag_size(&skb_shinfo(skb)->frags[i]); 2659 skb->data_len += skb_frag_size(&skb_shinfo(skb)->frags[i]); 2660 i++; 2661 skb_shinfo(skb)->nr_frags = i; 2662 } 2663 } 2664 2665 /* Stamp the time, and sequence number, 2666 * convert them to network byte order 2667 */ 2668 pgh->pgh_magic = htonl(PKTGEN_MAGIC); 2669 pgh->seq_num = htonl(pkt_dev->seq_num); 2670 2671 if (pkt_dev->flags & F_NO_TIMESTAMP) { 2672 pgh->tv_sec = 0; 2673 pgh->tv_usec = 0; 2674 } else { 2675 /* 2676 * pgh->tv_sec wraps in y2106 when interpreted as unsigned 2677 * as done by wireshark, or y2038 when interpreted as signed. 2678 * This is probably harmless, but if anyone wants to improve 2679 * it, we could introduce a variant that puts 64-bit nanoseconds 2680 * into the respective header bytes. 2681 * This would also be slightly faster to read. 2682 */ 2683 ktime_get_real_ts64(×tamp); 2684 pgh->tv_sec = htonl(timestamp.tv_sec); 2685 pgh->tv_usec = htonl(timestamp.tv_nsec / NSEC_PER_USEC); 2686 } 2687 } 2688 2689 static struct sk_buff *pktgen_alloc_skb(struct net_device *dev, 2690 struct pktgen_dev *pkt_dev) 2691 { 2692 unsigned int extralen = LL_RESERVED_SPACE(dev); 2693 struct sk_buff *skb = NULL; 2694 unsigned int size; 2695 2696 size = pkt_dev->cur_pkt_size + 64 + extralen + pkt_dev->pkt_overhead; 2697 if (pkt_dev->flags & F_NODE) { 2698 int node = pkt_dev->node >= 0 ? pkt_dev->node : numa_node_id(); 2699 2700 skb = __alloc_skb(NET_SKB_PAD + size, GFP_NOWAIT, 0, node); 2701 if (likely(skb)) { 2702 skb_reserve(skb, NET_SKB_PAD); 2703 skb->dev = dev; 2704 } 2705 } else { 2706 skb = __netdev_alloc_skb(dev, size, GFP_NOWAIT); 2707 } 2708 2709 /* the caller pre-fetches from skb->data and reserves for the mac hdr */ 2710 if (likely(skb)) 2711 skb_reserve(skb, extralen - 16); 2712 2713 return skb; 2714 } 2715 2716 static struct sk_buff *fill_packet_ipv4(struct net_device *odev, 2717 struct pktgen_dev *pkt_dev) 2718 { 2719 struct sk_buff *skb = NULL; 2720 __u8 *eth; 2721 struct udphdr *udph; 2722 int datalen, iplen; 2723 struct iphdr *iph; 2724 __be16 protocol = htons(ETH_P_IP); 2725 __be32 *mpls; 2726 __be16 *vlan_tci = NULL; /* Encapsulates priority and VLAN ID */ 2727 __be16 *vlan_encapsulated_proto = NULL; /* packet type ID field (or len) for VLAN tag */ 2728 __be16 *svlan_tci = NULL; /* Encapsulates priority and SVLAN ID */ 2729 __be16 *svlan_encapsulated_proto = NULL; /* packet type ID field (or len) for SVLAN tag */ 2730 u16 queue_map; 2731 2732 if (pkt_dev->nr_labels) 2733 protocol = htons(ETH_P_MPLS_UC); 2734 2735 if (pkt_dev->vlan_id != 0xffff) 2736 protocol = htons(ETH_P_8021Q); 2737 2738 /* Update any of the values, used when we're incrementing various 2739 * fields. 2740 */ 2741 mod_cur_headers(pkt_dev); 2742 queue_map = pkt_dev->cur_queue_map; 2743 2744 skb = pktgen_alloc_skb(odev, pkt_dev); 2745 if (!skb) { 2746 sprintf(pkt_dev->result, "No memory"); 2747 return NULL; 2748 } 2749 2750 prefetchw(skb->data); 2751 skb_reserve(skb, 16); 2752 2753 /* Reserve for ethernet and IP header */ 2754 eth = skb_push(skb, 14); 2755 mpls = skb_put(skb, pkt_dev->nr_labels * sizeof(__u32)); 2756 if (pkt_dev->nr_labels) 2757 mpls_push(mpls, pkt_dev); 2758 2759 if (pkt_dev->vlan_id != 0xffff) { 2760 if (pkt_dev->svlan_id != 0xffff) { 2761 svlan_tci = skb_put(skb, sizeof(__be16)); 2762 *svlan_tci = build_tci(pkt_dev->svlan_id, 2763 pkt_dev->svlan_cfi, 2764 pkt_dev->svlan_p); 2765 svlan_encapsulated_proto = skb_put(skb, 2766 sizeof(__be16)); 2767 *svlan_encapsulated_proto = htons(ETH_P_8021Q); 2768 } 2769 vlan_tci = skb_put(skb, sizeof(__be16)); 2770 *vlan_tci = build_tci(pkt_dev->vlan_id, 2771 pkt_dev->vlan_cfi, 2772 pkt_dev->vlan_p); 2773 vlan_encapsulated_proto = skb_put(skb, sizeof(__be16)); 2774 *vlan_encapsulated_proto = htons(ETH_P_IP); 2775 } 2776 2777 skb_reset_mac_header(skb); 2778 skb_set_network_header(skb, skb->len); 2779 iph = skb_put(skb, sizeof(struct iphdr)); 2780 2781 skb_set_transport_header(skb, skb->len); 2782 udph = skb_put(skb, sizeof(struct udphdr)); 2783 skb_set_queue_mapping(skb, queue_map); 2784 skb->priority = pkt_dev->skb_priority; 2785 2786 memcpy(eth, pkt_dev->hh, 12); 2787 *(__be16 *) & eth[12] = protocol; 2788 2789 /* Eth + IPh + UDPh + mpls */ 2790 datalen = pkt_dev->cur_pkt_size - 14 - 20 - 8 - 2791 pkt_dev->pkt_overhead; 2792 if (datalen < 0 || datalen < sizeof(struct pktgen_hdr)) 2793 datalen = sizeof(struct pktgen_hdr); 2794 2795 udph->source = htons(pkt_dev->cur_udp_src); 2796 udph->dest = htons(pkt_dev->cur_udp_dst); 2797 udph->len = htons(datalen + 8); /* DATA + udphdr */ 2798 udph->check = 0; 2799 2800 iph->ihl = 5; 2801 iph->version = 4; 2802 iph->ttl = 32; 2803 iph->tos = pkt_dev->tos; 2804 iph->protocol = IPPROTO_UDP; /* UDP */ 2805 iph->saddr = pkt_dev->cur_saddr; 2806 iph->daddr = pkt_dev->cur_daddr; 2807 iph->id = htons(pkt_dev->ip_id); 2808 pkt_dev->ip_id++; 2809 iph->frag_off = 0; 2810 iplen = 20 + 8 + datalen; 2811 iph->tot_len = htons(iplen); 2812 ip_send_check(iph); 2813 skb->protocol = protocol; 2814 skb->dev = odev; 2815 skb->pkt_type = PACKET_HOST; 2816 2817 pktgen_finalize_skb(pkt_dev, skb, datalen); 2818 2819 if (!(pkt_dev->flags & F_UDPCSUM)) { 2820 skb->ip_summed = CHECKSUM_NONE; 2821 } else if (odev->features & (NETIF_F_HW_CSUM | NETIF_F_IP_CSUM)) { 2822 skb->ip_summed = CHECKSUM_PARTIAL; 2823 skb->csum = 0; 2824 udp4_hwcsum(skb, iph->saddr, iph->daddr); 2825 } else { 2826 __wsum csum = skb_checksum(skb, skb_transport_offset(skb), datalen + 8, 0); 2827 2828 /* add protocol-dependent pseudo-header */ 2829 udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr, 2830 datalen + 8, IPPROTO_UDP, csum); 2831 2832 if (udph->check == 0) 2833 udph->check = CSUM_MANGLED_0; 2834 } 2835 2836 #ifdef CONFIG_XFRM 2837 if (!process_ipsec(pkt_dev, skb, protocol)) 2838 return NULL; 2839 #endif 2840 2841 return skb; 2842 } 2843 2844 static struct sk_buff *fill_packet_ipv6(struct net_device *odev, 2845 struct pktgen_dev *pkt_dev) 2846 { 2847 struct sk_buff *skb = NULL; 2848 __u8 *eth; 2849 struct udphdr *udph; 2850 int datalen, udplen; 2851 struct ipv6hdr *iph; 2852 __be16 protocol = htons(ETH_P_IPV6); 2853 __be32 *mpls; 2854 __be16 *vlan_tci = NULL; /* Encapsulates priority and VLAN ID */ 2855 __be16 *vlan_encapsulated_proto = NULL; /* packet type ID field (or len) for VLAN tag */ 2856 __be16 *svlan_tci = NULL; /* Encapsulates priority and SVLAN ID */ 2857 __be16 *svlan_encapsulated_proto = NULL; /* packet type ID field (or len) for SVLAN tag */ 2858 u16 queue_map; 2859 2860 if (pkt_dev->nr_labels) 2861 protocol = htons(ETH_P_MPLS_UC); 2862 2863 if (pkt_dev->vlan_id != 0xffff) 2864 protocol = htons(ETH_P_8021Q); 2865 2866 /* Update any of the values, used when we're incrementing various 2867 * fields. 2868 */ 2869 mod_cur_headers(pkt_dev); 2870 queue_map = pkt_dev->cur_queue_map; 2871 2872 skb = pktgen_alloc_skb(odev, pkt_dev); 2873 if (!skb) { 2874 sprintf(pkt_dev->result, "No memory"); 2875 return NULL; 2876 } 2877 2878 prefetchw(skb->data); 2879 skb_reserve(skb, 16); 2880 2881 /* Reserve for ethernet and IP header */ 2882 eth = skb_push(skb, 14); 2883 mpls = skb_put(skb, pkt_dev->nr_labels * sizeof(__u32)); 2884 if (pkt_dev->nr_labels) 2885 mpls_push(mpls, pkt_dev); 2886 2887 if (pkt_dev->vlan_id != 0xffff) { 2888 if (pkt_dev->svlan_id != 0xffff) { 2889 svlan_tci = skb_put(skb, sizeof(__be16)); 2890 *svlan_tci = build_tci(pkt_dev->svlan_id, 2891 pkt_dev->svlan_cfi, 2892 pkt_dev->svlan_p); 2893 svlan_encapsulated_proto = skb_put(skb, 2894 sizeof(__be16)); 2895 *svlan_encapsulated_proto = htons(ETH_P_8021Q); 2896 } 2897 vlan_tci = skb_put(skb, sizeof(__be16)); 2898 *vlan_tci = build_tci(pkt_dev->vlan_id, 2899 pkt_dev->vlan_cfi, 2900 pkt_dev->vlan_p); 2901 vlan_encapsulated_proto = skb_put(skb, sizeof(__be16)); 2902 *vlan_encapsulated_proto = htons(ETH_P_IPV6); 2903 } 2904 2905 skb_reset_mac_header(skb); 2906 skb_set_network_header(skb, skb->len); 2907 iph = skb_put(skb, sizeof(struct ipv6hdr)); 2908 2909 skb_set_transport_header(skb, skb->len); 2910 udph = skb_put(skb, sizeof(struct udphdr)); 2911 skb_set_queue_mapping(skb, queue_map); 2912 skb->priority = pkt_dev->skb_priority; 2913 2914 memcpy(eth, pkt_dev->hh, 12); 2915 *(__be16 *) ð[12] = protocol; 2916 2917 /* Eth + IPh + UDPh + mpls */ 2918 datalen = pkt_dev->cur_pkt_size - 14 - 2919 sizeof(struct ipv6hdr) - sizeof(struct udphdr) - 2920 pkt_dev->pkt_overhead; 2921 2922 if (datalen < 0 || datalen < sizeof(struct pktgen_hdr)) { 2923 datalen = sizeof(struct pktgen_hdr); 2924 net_info_ratelimited("increased datalen to %d\n", datalen); 2925 } 2926 2927 udplen = datalen + sizeof(struct udphdr); 2928 udph->source = htons(pkt_dev->cur_udp_src); 2929 udph->dest = htons(pkt_dev->cur_udp_dst); 2930 udph->len = htons(udplen); 2931 udph->check = 0; 2932 2933 *(__be32 *) iph = htonl(0x60000000); /* Version + flow */ 2934 2935 if (pkt_dev->traffic_class) { 2936 /* Version + traffic class + flow (0) */ 2937 *(__be32 *)iph |= htonl(0x60000000 | (pkt_dev->traffic_class << 20)); 2938 } 2939 2940 iph->hop_limit = 32; 2941 2942 iph->payload_len = htons(udplen); 2943 iph->nexthdr = IPPROTO_UDP; 2944 2945 iph->daddr = pkt_dev->cur_in6_daddr; 2946 iph->saddr = pkt_dev->cur_in6_saddr; 2947 2948 skb->protocol = protocol; 2949 skb->dev = odev; 2950 skb->pkt_type = PACKET_HOST; 2951 2952 pktgen_finalize_skb(pkt_dev, skb, datalen); 2953 2954 if (!(pkt_dev->flags & F_UDPCSUM)) { 2955 skb->ip_summed = CHECKSUM_NONE; 2956 } else if (odev->features & (NETIF_F_HW_CSUM | NETIF_F_IPV6_CSUM)) { 2957 skb->ip_summed = CHECKSUM_PARTIAL; 2958 skb->csum_start = skb_transport_header(skb) - skb->head; 2959 skb->csum_offset = offsetof(struct udphdr, check); 2960 udph->check = ~csum_ipv6_magic(&iph->saddr, &iph->daddr, udplen, IPPROTO_UDP, 0); 2961 } else { 2962 __wsum csum = skb_checksum(skb, skb_transport_offset(skb), udplen, 0); 2963 2964 /* add protocol-dependent pseudo-header */ 2965 udph->check = csum_ipv6_magic(&iph->saddr, &iph->daddr, udplen, IPPROTO_UDP, csum); 2966 2967 if (udph->check == 0) 2968 udph->check = CSUM_MANGLED_0; 2969 } 2970 2971 return skb; 2972 } 2973 2974 static struct sk_buff *fill_packet(struct net_device *odev, 2975 struct pktgen_dev *pkt_dev) 2976 { 2977 if (pkt_dev->flags & F_IPV6) 2978 return fill_packet_ipv6(odev, pkt_dev); 2979 else 2980 return fill_packet_ipv4(odev, pkt_dev); 2981 } 2982 2983 static void pktgen_clear_counters(struct pktgen_dev *pkt_dev) 2984 { 2985 pkt_dev->seq_num = 1; 2986 pkt_dev->idle_acc = 0; 2987 pkt_dev->sofar = 0; 2988 pkt_dev->tx_bytes = 0; 2989 pkt_dev->errors = 0; 2990 } 2991 2992 /* Set up structure for sending pkts, clear counters */ 2993 2994 static void pktgen_run(struct pktgen_thread *t) 2995 { 2996 struct pktgen_dev *pkt_dev; 2997 int started = 0; 2998 2999 func_enter(); 3000 3001 rcu_read_lock(); 3002 list_for_each_entry_rcu(pkt_dev, &t->if_list, list) { 3003 3004 /* 3005 * setup odev and create initial packet. 3006 */ 3007 pktgen_setup_inject(pkt_dev); 3008 3009 if (pkt_dev->odev) { 3010 pktgen_clear_counters(pkt_dev); 3011 pkt_dev->skb = NULL; 3012 pkt_dev->started_at = pkt_dev->next_tx = ktime_get(); 3013 3014 set_pkt_overhead(pkt_dev); 3015 3016 strcpy(pkt_dev->result, "Starting"); 3017 pkt_dev->running = 1; /* Cranke yeself! */ 3018 started++; 3019 } else 3020 strcpy(pkt_dev->result, "Error starting"); 3021 } 3022 rcu_read_unlock(); 3023 if (started) 3024 t->control &= ~(T_STOP); 3025 } 3026 3027 static void pktgen_handle_all_threads(struct pktgen_net *pn, u32 flags) 3028 { 3029 struct pktgen_thread *t; 3030 3031 mutex_lock(&pktgen_thread_lock); 3032 3033 list_for_each_entry(t, &pn->pktgen_threads, th_list) 3034 t->control |= (flags); 3035 3036 mutex_unlock(&pktgen_thread_lock); 3037 } 3038 3039 static void pktgen_stop_all_threads(struct pktgen_net *pn) 3040 { 3041 func_enter(); 3042 3043 pktgen_handle_all_threads(pn, T_STOP); 3044 } 3045 3046 static int thread_is_running(const struct pktgen_thread *t) 3047 { 3048 const struct pktgen_dev *pkt_dev; 3049 3050 rcu_read_lock(); 3051 list_for_each_entry_rcu(pkt_dev, &t->if_list, list) 3052 if (pkt_dev->running) { 3053 rcu_read_unlock(); 3054 return 1; 3055 } 3056 rcu_read_unlock(); 3057 return 0; 3058 } 3059 3060 static int pktgen_wait_thread_run(struct pktgen_thread *t) 3061 { 3062 while (thread_is_running(t)) { 3063 3064 /* note: 't' will still be around even after the unlock/lock 3065 * cycle because pktgen_thread threads are only cleared at 3066 * net exit 3067 */ 3068 mutex_unlock(&pktgen_thread_lock); 3069 msleep_interruptible(100); 3070 mutex_lock(&pktgen_thread_lock); 3071 3072 if (signal_pending(current)) 3073 goto signal; 3074 } 3075 return 1; 3076 signal: 3077 return 0; 3078 } 3079 3080 static int pktgen_wait_all_threads_run(struct pktgen_net *pn) 3081 { 3082 struct pktgen_thread *t; 3083 int sig = 1; 3084 3085 /* prevent from racing with rmmod */ 3086 if (!try_module_get(THIS_MODULE)) 3087 return sig; 3088 3089 mutex_lock(&pktgen_thread_lock); 3090 3091 list_for_each_entry(t, &pn->pktgen_threads, th_list) { 3092 sig = pktgen_wait_thread_run(t); 3093 if (sig == 0) 3094 break; 3095 } 3096 3097 if (sig == 0) 3098 list_for_each_entry(t, &pn->pktgen_threads, th_list) 3099 t->control |= (T_STOP); 3100 3101 mutex_unlock(&pktgen_thread_lock); 3102 module_put(THIS_MODULE); 3103 return sig; 3104 } 3105 3106 static void pktgen_run_all_threads(struct pktgen_net *pn) 3107 { 3108 func_enter(); 3109 3110 pktgen_handle_all_threads(pn, T_RUN); 3111 3112 /* Propagate thread->control */ 3113 schedule_timeout_interruptible(msecs_to_jiffies(125)); 3114 3115 pktgen_wait_all_threads_run(pn); 3116 } 3117 3118 static void pktgen_reset_all_threads(struct pktgen_net *pn) 3119 { 3120 func_enter(); 3121 3122 pktgen_handle_all_threads(pn, T_REMDEVALL); 3123 3124 /* Propagate thread->control */ 3125 schedule_timeout_interruptible(msecs_to_jiffies(125)); 3126 3127 pktgen_wait_all_threads_run(pn); 3128 } 3129 3130 static void show_results(struct pktgen_dev *pkt_dev, int nr_frags) 3131 { 3132 __u64 bps, mbps, pps; 3133 char *p = pkt_dev->result; 3134 ktime_t elapsed = ktime_sub(pkt_dev->stopped_at, 3135 pkt_dev->started_at); 3136 ktime_t idle = ns_to_ktime(pkt_dev->idle_acc); 3137 3138 p += sprintf(p, "OK: %llu(c%llu+d%llu) usec, %llu (%dbyte,%dfrags)\n", 3139 (unsigned long long)ktime_to_us(elapsed), 3140 (unsigned long long)ktime_to_us(ktime_sub(elapsed, idle)), 3141 (unsigned long long)ktime_to_us(idle), 3142 (unsigned long long)pkt_dev->sofar, 3143 pkt_dev->cur_pkt_size, nr_frags); 3144 3145 pps = div64_u64(pkt_dev->sofar * NSEC_PER_SEC, 3146 ktime_to_ns(elapsed)); 3147 3148 bps = pps * 8 * pkt_dev->cur_pkt_size; 3149 3150 mbps = bps; 3151 do_div(mbps, 1000000); 3152 p += sprintf(p, " %llupps %lluMb/sec (%llubps) errors: %llu", 3153 (unsigned long long)pps, 3154 (unsigned long long)mbps, 3155 (unsigned long long)bps, 3156 (unsigned long long)pkt_dev->errors); 3157 } 3158 3159 /* Set stopped-at timer, remove from running list, do counters & statistics */ 3160 static int pktgen_stop_device(struct pktgen_dev *pkt_dev) 3161 { 3162 int nr_frags = pkt_dev->skb ? skb_shinfo(pkt_dev->skb)->nr_frags : -1; 3163 3164 if (!pkt_dev->running) { 3165 pr_warn("interface: %s is already stopped\n", 3166 pkt_dev->odevname); 3167 return -EINVAL; 3168 } 3169 3170 pkt_dev->running = 0; 3171 kfree_skb(pkt_dev->skb); 3172 pkt_dev->skb = NULL; 3173 pkt_dev->stopped_at = ktime_get(); 3174 3175 show_results(pkt_dev, nr_frags); 3176 3177 return 0; 3178 } 3179 3180 static struct pktgen_dev *next_to_run(struct pktgen_thread *t) 3181 { 3182 struct pktgen_dev *pkt_dev, *best = NULL; 3183 3184 rcu_read_lock(); 3185 list_for_each_entry_rcu(pkt_dev, &t->if_list, list) { 3186 if (!pkt_dev->running) 3187 continue; 3188 if (best == NULL) 3189 best = pkt_dev; 3190 else if (ktime_compare(pkt_dev->next_tx, best->next_tx) < 0) 3191 best = pkt_dev; 3192 } 3193 rcu_read_unlock(); 3194 3195 return best; 3196 } 3197 3198 static void pktgen_stop(struct pktgen_thread *t) 3199 { 3200 struct pktgen_dev *pkt_dev; 3201 3202 func_enter(); 3203 3204 rcu_read_lock(); 3205 3206 list_for_each_entry_rcu(pkt_dev, &t->if_list, list) { 3207 pktgen_stop_device(pkt_dev); 3208 } 3209 3210 rcu_read_unlock(); 3211 } 3212 3213 /* 3214 * one of our devices needs to be removed - find it 3215 * and remove it 3216 */ 3217 static void pktgen_rem_one_if(struct pktgen_thread *t) 3218 { 3219 struct list_head *q, *n; 3220 struct pktgen_dev *cur; 3221 3222 func_enter(); 3223 3224 list_for_each_safe(q, n, &t->if_list) { 3225 cur = list_entry(q, struct pktgen_dev, list); 3226 3227 if (!cur->removal_mark) 3228 continue; 3229 3230 kfree_skb(cur->skb); 3231 cur->skb = NULL; 3232 3233 pktgen_remove_device(t, cur); 3234 3235 break; 3236 } 3237 } 3238 3239 static void pktgen_rem_all_ifs(struct pktgen_thread *t) 3240 { 3241 struct list_head *q, *n; 3242 struct pktgen_dev *cur; 3243 3244 func_enter(); 3245 3246 /* Remove all devices, free mem */ 3247 3248 list_for_each_safe(q, n, &t->if_list) { 3249 cur = list_entry(q, struct pktgen_dev, list); 3250 3251 kfree_skb(cur->skb); 3252 cur->skb = NULL; 3253 3254 pktgen_remove_device(t, cur); 3255 } 3256 } 3257 3258 static void pktgen_rem_thread(struct pktgen_thread *t) 3259 { 3260 /* Remove from the thread list */ 3261 remove_proc_entry(t->tsk->comm, t->net->proc_dir); 3262 } 3263 3264 static void pktgen_resched(struct pktgen_dev *pkt_dev) 3265 { 3266 ktime_t idle_start = ktime_get(); 3267 schedule(); 3268 pkt_dev->idle_acc += ktime_to_ns(ktime_sub(ktime_get(), idle_start)); 3269 } 3270 3271 static void pktgen_wait_for_skb(struct pktgen_dev *pkt_dev) 3272 { 3273 ktime_t idle_start = ktime_get(); 3274 3275 while (refcount_read(&(pkt_dev->skb->users)) != 1) { 3276 if (signal_pending(current)) 3277 break; 3278 3279 if (need_resched()) 3280 pktgen_resched(pkt_dev); 3281 else 3282 cpu_relax(); 3283 } 3284 pkt_dev->idle_acc += ktime_to_ns(ktime_sub(ktime_get(), idle_start)); 3285 } 3286 3287 static void pktgen_xmit(struct pktgen_dev *pkt_dev) 3288 { 3289 unsigned int burst = READ_ONCE(pkt_dev->burst); 3290 struct net_device *odev = pkt_dev->odev; 3291 struct netdev_queue *txq; 3292 struct sk_buff *skb; 3293 int ret; 3294 3295 /* If device is offline, then don't send */ 3296 if (unlikely(!netif_running(odev) || !netif_carrier_ok(odev))) { 3297 pktgen_stop_device(pkt_dev); 3298 return; 3299 } 3300 3301 /* This is max DELAY, this has special meaning of 3302 * "never transmit" 3303 */ 3304 if (unlikely(pkt_dev->delay == ULLONG_MAX)) { 3305 pkt_dev->next_tx = ktime_add_ns(ktime_get(), ULONG_MAX); 3306 return; 3307 } 3308 3309 /* If no skb or clone count exhausted then get new one */ 3310 if (!pkt_dev->skb || (pkt_dev->last_ok && 3311 ++pkt_dev->clone_count >= pkt_dev->clone_skb)) { 3312 /* build a new pkt */ 3313 kfree_skb(pkt_dev->skb); 3314 3315 pkt_dev->skb = fill_packet(odev, pkt_dev); 3316 if (pkt_dev->skb == NULL) { 3317 pr_err("ERROR: couldn't allocate skb in fill_packet\n"); 3318 schedule(); 3319 pkt_dev->clone_count--; /* back out increment, OOM */ 3320 return; 3321 } 3322 pkt_dev->last_pkt_size = pkt_dev->skb->len; 3323 pkt_dev->clone_count = 0; /* reset counter */ 3324 } 3325 3326 if (pkt_dev->delay && pkt_dev->last_ok) 3327 spin(pkt_dev, pkt_dev->next_tx); 3328 3329 if (pkt_dev->xmit_mode == M_NETIF_RECEIVE) { 3330 skb = pkt_dev->skb; 3331 skb->protocol = eth_type_trans(skb, skb->dev); 3332 refcount_add(burst, &skb->users); 3333 local_bh_disable(); 3334 do { 3335 ret = netif_receive_skb(skb); 3336 if (ret == NET_RX_DROP) 3337 pkt_dev->errors++; 3338 pkt_dev->sofar++; 3339 pkt_dev->seq_num++; 3340 if (refcount_read(&skb->users) != burst) { 3341 /* skb was queued by rps/rfs or taps, 3342 * so cannot reuse this skb 3343 */ 3344 WARN_ON(refcount_sub_and_test(burst - 1, &skb->users)); 3345 /* get out of the loop and wait 3346 * until skb is consumed 3347 */ 3348 break; 3349 } 3350 /* skb was 'freed' by stack, so clean few 3351 * bits and reuse it 3352 */ 3353 skb_reset_redirect(skb); 3354 } while (--burst > 0); 3355 goto out; /* Skips xmit_mode M_START_XMIT */ 3356 } else if (pkt_dev->xmit_mode == M_QUEUE_XMIT) { 3357 local_bh_disable(); 3358 refcount_inc(&pkt_dev->skb->users); 3359 3360 ret = dev_queue_xmit(pkt_dev->skb); 3361 switch (ret) { 3362 case NET_XMIT_SUCCESS: 3363 pkt_dev->sofar++; 3364 pkt_dev->seq_num++; 3365 pkt_dev->tx_bytes += pkt_dev->last_pkt_size; 3366 break; 3367 case NET_XMIT_DROP: 3368 case NET_XMIT_CN: 3369 /* These are all valid return codes for a qdisc but 3370 * indicate packets are being dropped or will likely 3371 * be dropped soon. 3372 */ 3373 case NETDEV_TX_BUSY: 3374 /* qdisc may call dev_hard_start_xmit directly in cases 3375 * where no queues exist e.g. loopback device, virtual 3376 * devices, etc. In this case we need to handle 3377 * NETDEV_TX_ codes. 3378 */ 3379 default: 3380 pkt_dev->errors++; 3381 net_info_ratelimited("%s xmit error: %d\n", 3382 pkt_dev->odevname, ret); 3383 break; 3384 } 3385 goto out; 3386 } 3387 3388 txq = skb_get_tx_queue(odev, pkt_dev->skb); 3389 3390 local_bh_disable(); 3391 3392 HARD_TX_LOCK(odev, txq, smp_processor_id()); 3393 3394 if (unlikely(netif_xmit_frozen_or_drv_stopped(txq))) { 3395 pkt_dev->last_ok = 0; 3396 goto unlock; 3397 } 3398 refcount_add(burst, &pkt_dev->skb->users); 3399 3400 xmit_more: 3401 ret = netdev_start_xmit(pkt_dev->skb, odev, txq, --burst > 0); 3402 3403 switch (ret) { 3404 case NETDEV_TX_OK: 3405 pkt_dev->last_ok = 1; 3406 pkt_dev->sofar++; 3407 pkt_dev->seq_num++; 3408 pkt_dev->tx_bytes += pkt_dev->last_pkt_size; 3409 if (burst > 0 && !netif_xmit_frozen_or_drv_stopped(txq)) 3410 goto xmit_more; 3411 break; 3412 case NET_XMIT_DROP: 3413 case NET_XMIT_CN: 3414 /* skb has been consumed */ 3415 pkt_dev->errors++; 3416 break; 3417 default: /* Drivers are not supposed to return other values! */ 3418 net_info_ratelimited("%s xmit error: %d\n", 3419 pkt_dev->odevname, ret); 3420 pkt_dev->errors++; 3421 fallthrough; 3422 case NETDEV_TX_BUSY: 3423 /* Retry it next time */ 3424 refcount_dec(&(pkt_dev->skb->users)); 3425 pkt_dev->last_ok = 0; 3426 } 3427 if (unlikely(burst)) 3428 WARN_ON(refcount_sub_and_test(burst, &pkt_dev->skb->users)); 3429 unlock: 3430 HARD_TX_UNLOCK(odev, txq); 3431 3432 out: 3433 local_bh_enable(); 3434 3435 /* If pkt_dev->count is zero, then run forever */ 3436 if ((pkt_dev->count != 0) && (pkt_dev->sofar >= pkt_dev->count)) { 3437 pktgen_wait_for_skb(pkt_dev); 3438 3439 /* Done with this */ 3440 pktgen_stop_device(pkt_dev); 3441 } 3442 } 3443 3444 /* 3445 * Main loop of the thread goes here 3446 */ 3447 3448 static int pktgen_thread_worker(void *arg) 3449 { 3450 DEFINE_WAIT(wait); 3451 struct pktgen_thread *t = arg; 3452 struct pktgen_dev *pkt_dev = NULL; 3453 int cpu = t->cpu; 3454 3455 WARN_ON(smp_processor_id() != cpu); 3456 3457 init_waitqueue_head(&t->queue); 3458 complete(&t->start_done); 3459 3460 pr_debug("starting pktgen/%d: pid=%d\n", cpu, task_pid_nr(current)); 3461 3462 set_freezable(); 3463 3464 while (!kthread_should_stop()) { 3465 pkt_dev = next_to_run(t); 3466 3467 if (unlikely(!pkt_dev && t->control == 0)) { 3468 if (t->net->pktgen_exiting) 3469 break; 3470 wait_event_interruptible_timeout(t->queue, 3471 t->control != 0, 3472 HZ/10); 3473 try_to_freeze(); 3474 continue; 3475 } 3476 3477 if (likely(pkt_dev)) { 3478 pktgen_xmit(pkt_dev); 3479 3480 if (need_resched()) 3481 pktgen_resched(pkt_dev); 3482 else 3483 cpu_relax(); 3484 } 3485 3486 if (t->control & T_STOP) { 3487 pktgen_stop(t); 3488 t->control &= ~(T_STOP); 3489 } 3490 3491 if (t->control & T_RUN) { 3492 pktgen_run(t); 3493 t->control &= ~(T_RUN); 3494 } 3495 3496 if (t->control & T_REMDEVALL) { 3497 pktgen_rem_all_ifs(t); 3498 t->control &= ~(T_REMDEVALL); 3499 } 3500 3501 if (t->control & T_REMDEV) { 3502 pktgen_rem_one_if(t); 3503 t->control &= ~(T_REMDEV); 3504 } 3505 3506 try_to_freeze(); 3507 } 3508 3509 pr_debug("%s stopping all device\n", t->tsk->comm); 3510 pktgen_stop(t); 3511 3512 pr_debug("%s removing all device\n", t->tsk->comm); 3513 pktgen_rem_all_ifs(t); 3514 3515 pr_debug("%s removing thread\n", t->tsk->comm); 3516 pktgen_rem_thread(t); 3517 3518 return 0; 3519 } 3520 3521 static struct pktgen_dev *pktgen_find_dev(struct pktgen_thread *t, 3522 const char *ifname, bool exact) 3523 { 3524 struct pktgen_dev *p, *pkt_dev = NULL; 3525 size_t len = strlen(ifname); 3526 3527 rcu_read_lock(); 3528 list_for_each_entry_rcu(p, &t->if_list, list) 3529 if (strncmp(p->odevname, ifname, len) == 0) { 3530 if (p->odevname[len]) { 3531 if (exact || p->odevname[len] != '@') 3532 continue; 3533 } 3534 pkt_dev = p; 3535 break; 3536 } 3537 3538 rcu_read_unlock(); 3539 pr_debug("find_dev(%s) returning %p\n", ifname, pkt_dev); 3540 return pkt_dev; 3541 } 3542 3543 /* 3544 * Adds a dev at front of if_list. 3545 */ 3546 3547 static int add_dev_to_thread(struct pktgen_thread *t, 3548 struct pktgen_dev *pkt_dev) 3549 { 3550 int rv = 0; 3551 3552 /* This function cannot be called concurrently, as its called 3553 * under pktgen_thread_lock mutex, but it can run from 3554 * userspace on another CPU than the kthread. The if_lock() 3555 * is used here to sync with concurrent instances of 3556 * _rem_dev_from_if_list() invoked via kthread, which is also 3557 * updating the if_list */ 3558 if_lock(t); 3559 3560 if (pkt_dev->pg_thread) { 3561 pr_err("ERROR: already assigned to a thread\n"); 3562 rv = -EBUSY; 3563 goto out; 3564 } 3565 3566 pkt_dev->running = 0; 3567 pkt_dev->pg_thread = t; 3568 list_add_rcu(&pkt_dev->list, &t->if_list); 3569 3570 out: 3571 if_unlock(t); 3572 return rv; 3573 } 3574 3575 /* Called under thread lock */ 3576 3577 static int pktgen_add_device(struct pktgen_thread *t, const char *ifname) 3578 { 3579 struct pktgen_dev *pkt_dev; 3580 int err; 3581 int node = cpu_to_node(t->cpu); 3582 3583 /* We don't allow a device to be on several threads */ 3584 3585 pkt_dev = __pktgen_NN_threads(t->net, ifname, FIND); 3586 if (pkt_dev) { 3587 pr_err("ERROR: interface already used\n"); 3588 return -EBUSY; 3589 } 3590 3591 pkt_dev = kzalloc_node(sizeof(struct pktgen_dev), GFP_KERNEL, node); 3592 if (!pkt_dev) 3593 return -ENOMEM; 3594 3595 strcpy(pkt_dev->odevname, ifname); 3596 pkt_dev->flows = vzalloc_node(array_size(MAX_CFLOWS, 3597 sizeof(struct flow_state)), 3598 node); 3599 if (pkt_dev->flows == NULL) { 3600 kfree(pkt_dev); 3601 return -ENOMEM; 3602 } 3603 3604 pkt_dev->removal_mark = 0; 3605 pkt_dev->nfrags = 0; 3606 pkt_dev->delay = pg_delay_d; 3607 pkt_dev->count = pg_count_d; 3608 pkt_dev->sofar = 0; 3609 pkt_dev->udp_src_min = 9; /* sink port */ 3610 pkt_dev->udp_src_max = 9; 3611 pkt_dev->udp_dst_min = 9; 3612 pkt_dev->udp_dst_max = 9; 3613 pkt_dev->vlan_p = 0; 3614 pkt_dev->vlan_cfi = 0; 3615 pkt_dev->vlan_id = 0xffff; 3616 pkt_dev->svlan_p = 0; 3617 pkt_dev->svlan_cfi = 0; 3618 pkt_dev->svlan_id = 0xffff; 3619 pkt_dev->burst = 1; 3620 pkt_dev->node = NUMA_NO_NODE; 3621 3622 err = pktgen_setup_dev(t->net, pkt_dev, ifname); 3623 if (err) 3624 goto out1; 3625 if (pkt_dev->odev->priv_flags & IFF_TX_SKB_SHARING) 3626 pkt_dev->clone_skb = pg_clone_skb_d; 3627 3628 pkt_dev->entry = proc_create_data(ifname, 0600, t->net->proc_dir, 3629 &pktgen_if_proc_ops, pkt_dev); 3630 if (!pkt_dev->entry) { 3631 pr_err("cannot create %s/%s procfs entry\n", 3632 PG_PROC_DIR, ifname); 3633 err = -EINVAL; 3634 goto out2; 3635 } 3636 #ifdef CONFIG_XFRM 3637 pkt_dev->ipsmode = XFRM_MODE_TRANSPORT; 3638 pkt_dev->ipsproto = IPPROTO_ESP; 3639 3640 /* xfrm tunnel mode needs additional dst to extract outter 3641 * ip header protocol/ttl/id field, here creat a phony one. 3642 * instead of looking for a valid rt, which definitely hurting 3643 * performance under such circumstance. 3644 */ 3645 pkt_dev->dstops.family = AF_INET; 3646 pkt_dev->xdst.u.dst.dev = pkt_dev->odev; 3647 dst_init_metrics(&pkt_dev->xdst.u.dst, pktgen_dst_metrics, false); 3648 pkt_dev->xdst.child = &pkt_dev->xdst.u.dst; 3649 pkt_dev->xdst.u.dst.ops = &pkt_dev->dstops; 3650 #endif 3651 3652 return add_dev_to_thread(t, pkt_dev); 3653 out2: 3654 dev_put(pkt_dev->odev); 3655 out1: 3656 #ifdef CONFIG_XFRM 3657 free_SAs(pkt_dev); 3658 #endif 3659 vfree(pkt_dev->flows); 3660 kfree(pkt_dev); 3661 return err; 3662 } 3663 3664 static int __net_init pktgen_create_thread(int cpu, struct pktgen_net *pn) 3665 { 3666 struct pktgen_thread *t; 3667 struct proc_dir_entry *pe; 3668 struct task_struct *p; 3669 3670 t = kzalloc_node(sizeof(struct pktgen_thread), GFP_KERNEL, 3671 cpu_to_node(cpu)); 3672 if (!t) { 3673 pr_err("ERROR: out of memory, can't create new thread\n"); 3674 return -ENOMEM; 3675 } 3676 3677 mutex_init(&t->if_lock); 3678 t->cpu = cpu; 3679 3680 INIT_LIST_HEAD(&t->if_list); 3681 3682 list_add_tail(&t->th_list, &pn->pktgen_threads); 3683 init_completion(&t->start_done); 3684 3685 p = kthread_create_on_node(pktgen_thread_worker, 3686 t, 3687 cpu_to_node(cpu), 3688 "kpktgend_%d", cpu); 3689 if (IS_ERR(p)) { 3690 pr_err("kthread_create_on_node() failed for cpu %d\n", t->cpu); 3691 list_del(&t->th_list); 3692 kfree(t); 3693 return PTR_ERR(p); 3694 } 3695 kthread_bind(p, cpu); 3696 t->tsk = p; 3697 3698 pe = proc_create_data(t->tsk->comm, 0600, pn->proc_dir, 3699 &pktgen_thread_proc_ops, t); 3700 if (!pe) { 3701 pr_err("cannot create %s/%s procfs entry\n", 3702 PG_PROC_DIR, t->tsk->comm); 3703 kthread_stop(p); 3704 list_del(&t->th_list); 3705 kfree(t); 3706 return -EINVAL; 3707 } 3708 3709 t->net = pn; 3710 get_task_struct(p); 3711 wake_up_process(p); 3712 wait_for_completion(&t->start_done); 3713 3714 return 0; 3715 } 3716 3717 /* 3718 * Removes a device from the thread if_list. 3719 */ 3720 static void _rem_dev_from_if_list(struct pktgen_thread *t, 3721 struct pktgen_dev *pkt_dev) 3722 { 3723 struct list_head *q, *n; 3724 struct pktgen_dev *p; 3725 3726 if_lock(t); 3727 list_for_each_safe(q, n, &t->if_list) { 3728 p = list_entry(q, struct pktgen_dev, list); 3729 if (p == pkt_dev) 3730 list_del_rcu(&p->list); 3731 } 3732 if_unlock(t); 3733 } 3734 3735 static int pktgen_remove_device(struct pktgen_thread *t, 3736 struct pktgen_dev *pkt_dev) 3737 { 3738 pr_debug("remove_device pkt_dev=%p\n", pkt_dev); 3739 3740 if (pkt_dev->running) { 3741 pr_warn("WARNING: trying to remove a running interface, stopping it now\n"); 3742 pktgen_stop_device(pkt_dev); 3743 } 3744 3745 /* Dis-associate from the interface */ 3746 3747 if (pkt_dev->odev) { 3748 dev_put(pkt_dev->odev); 3749 pkt_dev->odev = NULL; 3750 } 3751 3752 /* Remove proc before if_list entry, because add_device uses 3753 * list to determine if interface already exist, avoid race 3754 * with proc_create_data() */ 3755 proc_remove(pkt_dev->entry); 3756 3757 /* And update the thread if_list */ 3758 _rem_dev_from_if_list(t, pkt_dev); 3759 3760 #ifdef CONFIG_XFRM 3761 free_SAs(pkt_dev); 3762 #endif 3763 vfree(pkt_dev->flows); 3764 if (pkt_dev->page) 3765 put_page(pkt_dev->page); 3766 kfree_rcu(pkt_dev, rcu); 3767 return 0; 3768 } 3769 3770 static int __net_init pg_net_init(struct net *net) 3771 { 3772 struct pktgen_net *pn = net_generic(net, pg_net_id); 3773 struct proc_dir_entry *pe; 3774 int cpu, ret = 0; 3775 3776 pn->net = net; 3777 INIT_LIST_HEAD(&pn->pktgen_threads); 3778 pn->pktgen_exiting = false; 3779 pn->proc_dir = proc_mkdir(PG_PROC_DIR, pn->net->proc_net); 3780 if (!pn->proc_dir) { 3781 pr_warn("cannot create /proc/net/%s\n", PG_PROC_DIR); 3782 return -ENODEV; 3783 } 3784 pe = proc_create(PGCTRL, 0600, pn->proc_dir, &pktgen_proc_ops); 3785 if (pe == NULL) { 3786 pr_err("cannot create %s procfs entry\n", PGCTRL); 3787 ret = -EINVAL; 3788 goto remove; 3789 } 3790 3791 for_each_online_cpu(cpu) { 3792 int err; 3793 3794 err = pktgen_create_thread(cpu, pn); 3795 if (err) 3796 pr_warn("Cannot create thread for cpu %d (%d)\n", 3797 cpu, err); 3798 } 3799 3800 if (list_empty(&pn->pktgen_threads)) { 3801 pr_err("Initialization failed for all threads\n"); 3802 ret = -ENODEV; 3803 goto remove_entry; 3804 } 3805 3806 return 0; 3807 3808 remove_entry: 3809 remove_proc_entry(PGCTRL, pn->proc_dir); 3810 remove: 3811 remove_proc_entry(PG_PROC_DIR, pn->net->proc_net); 3812 return ret; 3813 } 3814 3815 static void __net_exit pg_net_exit(struct net *net) 3816 { 3817 struct pktgen_net *pn = net_generic(net, pg_net_id); 3818 struct pktgen_thread *t; 3819 struct list_head *q, *n; 3820 LIST_HEAD(list); 3821 3822 /* Stop all interfaces & threads */ 3823 pn->pktgen_exiting = true; 3824 3825 mutex_lock(&pktgen_thread_lock); 3826 list_splice_init(&pn->pktgen_threads, &list); 3827 mutex_unlock(&pktgen_thread_lock); 3828 3829 list_for_each_safe(q, n, &list) { 3830 t = list_entry(q, struct pktgen_thread, th_list); 3831 list_del(&t->th_list); 3832 kthread_stop(t->tsk); 3833 put_task_struct(t->tsk); 3834 kfree(t); 3835 } 3836 3837 remove_proc_entry(PGCTRL, pn->proc_dir); 3838 remove_proc_entry(PG_PROC_DIR, pn->net->proc_net); 3839 } 3840 3841 static struct pernet_operations pg_net_ops = { 3842 .init = pg_net_init, 3843 .exit = pg_net_exit, 3844 .id = &pg_net_id, 3845 .size = sizeof(struct pktgen_net), 3846 }; 3847 3848 static int __init pg_init(void) 3849 { 3850 int ret = 0; 3851 3852 pr_info("%s", version); 3853 ret = register_pernet_subsys(&pg_net_ops); 3854 if (ret) 3855 return ret; 3856 ret = register_netdevice_notifier(&pktgen_notifier_block); 3857 if (ret) 3858 unregister_pernet_subsys(&pg_net_ops); 3859 3860 return ret; 3861 } 3862 3863 static void __exit pg_cleanup(void) 3864 { 3865 unregister_netdevice_notifier(&pktgen_notifier_block); 3866 unregister_pernet_subsys(&pg_net_ops); 3867 /* Don't need rcu_barrier() due to use of kfree_rcu() */ 3868 } 3869 3870 module_init(pg_init); 3871 module_exit(pg_cleanup); 3872 3873 MODULE_AUTHOR("Robert Olsson <robert.olsson@its.uu.se>"); 3874 MODULE_DESCRIPTION("Packet Generator tool"); 3875 MODULE_LICENSE("GPL"); 3876 MODULE_VERSION(VERSION); 3877 module_param(pg_count_d, int, 0); 3878 MODULE_PARM_DESC(pg_count_d, "Default number of packets to inject"); 3879 module_param(pg_delay_d, int, 0); 3880 MODULE_PARM_DESC(pg_delay_d, "Default delay between packets (nanoseconds)"); 3881 module_param(pg_clone_skb_d, int, 0); 3882 MODULE_PARM_DESC(pg_clone_skb_d, "Default number of copies of the same packet"); 3883 module_param(debug, int, 0); 3884 MODULE_PARM_DESC(debug, "Enable debugging of pktgen module"); 3885