1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) 2 /* 3 * proc.c - procfs support for Protocol family CAN core module 4 * 5 * Copyright (c) 2002-2007 Volkswagen Group Electronic Research 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of Volkswagen nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * Alternatively, provided that this notice is retained in full, this 21 * software may be distributed under the terms of the GNU General 22 * Public License ("GPL") version 2, in which case the provisions of the 23 * GPL apply INSTEAD OF those given above. 24 * 25 * The provided data structures and external interfaces from this code 26 * are not restricted to be used by modules with a GPL compatible license. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH 39 * DAMAGE. 40 * 41 */ 42 43 #include <linux/module.h> 44 #include <linux/proc_fs.h> 45 #include <linux/list.h> 46 #include <linux/rcupdate.h> 47 #include <linux/if_arp.h> 48 #include <linux/can/can-ml.h> 49 #include <linux/can/core.h> 50 51 #include "af_can.h" 52 53 /* 54 * proc filenames for the PF_CAN core 55 */ 56 57 #define CAN_PROC_STATS "stats" 58 #define CAN_PROC_RESET_STATS "reset_stats" 59 #define CAN_PROC_RCVLIST_ALL "rcvlist_all" 60 #define CAN_PROC_RCVLIST_FIL "rcvlist_fil" 61 #define CAN_PROC_RCVLIST_INV "rcvlist_inv" 62 #define CAN_PROC_RCVLIST_SFF "rcvlist_sff" 63 #define CAN_PROC_RCVLIST_EFF "rcvlist_eff" 64 #define CAN_PROC_RCVLIST_ERR "rcvlist_err" 65 66 static int user_reset; 67 68 static const char rx_list_name[][8] = { 69 [RX_ERR] = "rx_err", 70 [RX_ALL] = "rx_all", 71 [RX_FIL] = "rx_fil", 72 [RX_INV] = "rx_inv", 73 }; 74 75 /* 76 * af_can statistics stuff 77 */ 78 can_init_stats(struct net * net)79 static void can_init_stats(struct net *net) 80 { 81 struct can_pkg_stats *pkg_stats = net->can.pkg_stats; 82 struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats; 83 /* 84 * This memset function is called from a timer context (when 85 * can_stattimer is active which is the default) OR in a process 86 * context (reading the proc_fs when can_stattimer is disabled). 87 */ 88 memset(pkg_stats, 0, sizeof(struct can_pkg_stats)); 89 pkg_stats->jiffies_init = jiffies; 90 91 rcv_lists_stats->stats_reset++; 92 93 if (user_reset) { 94 user_reset = 0; 95 rcv_lists_stats->user_reset++; 96 } 97 } 98 calc_rate(unsigned long oldjif,unsigned long newjif,unsigned long count)99 static unsigned long calc_rate(unsigned long oldjif, unsigned long newjif, 100 unsigned long count) 101 { 102 if (oldjif == newjif) 103 return 0; 104 105 /* see can_stat_update() - this should NEVER happen! */ 106 if (count > (ULONG_MAX / HZ)) { 107 printk(KERN_ERR "can: calc_rate: count exceeded! %ld\n", 108 count); 109 return 99999999; 110 } 111 112 return (count * HZ) / (newjif - oldjif); 113 } 114 can_stat_update(struct timer_list * t)115 void can_stat_update(struct timer_list *t) 116 { 117 struct net *net = from_timer(net, t, can.stattimer); 118 struct can_pkg_stats *pkg_stats = net->can.pkg_stats; 119 unsigned long j = jiffies; /* snapshot */ 120 121 /* restart counting in timer context on user request */ 122 if (user_reset) 123 can_init_stats(net); 124 125 /* restart counting on jiffies overflow */ 126 if (j < pkg_stats->jiffies_init) 127 can_init_stats(net); 128 129 /* prevent overflow in calc_rate() */ 130 if (pkg_stats->rx_frames > (ULONG_MAX / HZ)) 131 can_init_stats(net); 132 133 /* prevent overflow in calc_rate() */ 134 if (pkg_stats->tx_frames > (ULONG_MAX / HZ)) 135 can_init_stats(net); 136 137 /* matches overflow - very improbable */ 138 if (pkg_stats->matches > (ULONG_MAX / 100)) 139 can_init_stats(net); 140 141 /* calc total values */ 142 if (pkg_stats->rx_frames) 143 pkg_stats->total_rx_match_ratio = (pkg_stats->matches * 100) / 144 pkg_stats->rx_frames; 145 146 pkg_stats->total_tx_rate = calc_rate(pkg_stats->jiffies_init, j, 147 pkg_stats->tx_frames); 148 pkg_stats->total_rx_rate = calc_rate(pkg_stats->jiffies_init, j, 149 pkg_stats->rx_frames); 150 151 /* calc current values */ 152 if (pkg_stats->rx_frames_delta) 153 pkg_stats->current_rx_match_ratio = 154 (pkg_stats->matches_delta * 100) / 155 pkg_stats->rx_frames_delta; 156 157 pkg_stats->current_tx_rate = calc_rate(0, HZ, pkg_stats->tx_frames_delta); 158 pkg_stats->current_rx_rate = calc_rate(0, HZ, pkg_stats->rx_frames_delta); 159 160 /* check / update maximum values */ 161 if (pkg_stats->max_tx_rate < pkg_stats->current_tx_rate) 162 pkg_stats->max_tx_rate = pkg_stats->current_tx_rate; 163 164 if (pkg_stats->max_rx_rate < pkg_stats->current_rx_rate) 165 pkg_stats->max_rx_rate = pkg_stats->current_rx_rate; 166 167 if (pkg_stats->max_rx_match_ratio < pkg_stats->current_rx_match_ratio) 168 pkg_stats->max_rx_match_ratio = pkg_stats->current_rx_match_ratio; 169 170 /* clear values for 'current rate' calculation */ 171 pkg_stats->tx_frames_delta = 0; 172 pkg_stats->rx_frames_delta = 0; 173 pkg_stats->matches_delta = 0; 174 175 /* restart timer (one second) */ 176 mod_timer(&net->can.stattimer, round_jiffies(jiffies + HZ)); 177 } 178 179 /* 180 * proc read functions 181 */ 182 can_print_rcvlist(struct seq_file * m,struct hlist_head * rx_list,struct net_device * dev)183 static void can_print_rcvlist(struct seq_file *m, struct hlist_head *rx_list, 184 struct net_device *dev) 185 { 186 struct receiver *r; 187 188 hlist_for_each_entry_rcu(r, rx_list, list) { 189 char *fmt = (r->can_id & CAN_EFF_FLAG)? 190 " %-5s %08x %08x %pK %pK %8ld %s\n" : 191 " %-5s %03x %08x %pK %pK %8ld %s\n"; 192 193 seq_printf(m, fmt, DNAME(dev), r->can_id, r->mask, 194 r->func, r->data, r->matches, r->ident); 195 } 196 } 197 can_print_recv_banner(struct seq_file * m)198 static void can_print_recv_banner(struct seq_file *m) 199 { 200 /* 201 * can1. 00000000 00000000 00000000 202 * ....... 0 tp20 203 */ 204 if (IS_ENABLED(CONFIG_64BIT)) 205 seq_puts(m, " device can_id can_mask function userdata matches ident\n"); 206 else 207 seq_puts(m, " device can_id can_mask function userdata matches ident\n"); 208 } 209 can_stats_proc_show(struct seq_file * m,void * v)210 static int can_stats_proc_show(struct seq_file *m, void *v) 211 { 212 struct net *net = m->private; 213 struct can_pkg_stats *pkg_stats = net->can.pkg_stats; 214 struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats; 215 216 seq_putc(m, '\n'); 217 seq_printf(m, " %8ld transmitted frames (TXF)\n", pkg_stats->tx_frames); 218 seq_printf(m, " %8ld received frames (RXF)\n", pkg_stats->rx_frames); 219 seq_printf(m, " %8ld matched frames (RXMF)\n", pkg_stats->matches); 220 221 seq_putc(m, '\n'); 222 223 if (net->can.stattimer.function == can_stat_update) { 224 seq_printf(m, " %8ld %% total match ratio (RXMR)\n", 225 pkg_stats->total_rx_match_ratio); 226 227 seq_printf(m, " %8ld frames/s total tx rate (TXR)\n", 228 pkg_stats->total_tx_rate); 229 seq_printf(m, " %8ld frames/s total rx rate (RXR)\n", 230 pkg_stats->total_rx_rate); 231 232 seq_putc(m, '\n'); 233 234 seq_printf(m, " %8ld %% current match ratio (CRXMR)\n", 235 pkg_stats->current_rx_match_ratio); 236 237 seq_printf(m, " %8ld frames/s current tx rate (CTXR)\n", 238 pkg_stats->current_tx_rate); 239 seq_printf(m, " %8ld frames/s current rx rate (CRXR)\n", 240 pkg_stats->current_rx_rate); 241 242 seq_putc(m, '\n'); 243 244 seq_printf(m, " %8ld %% max match ratio (MRXMR)\n", 245 pkg_stats->max_rx_match_ratio); 246 247 seq_printf(m, " %8ld frames/s max tx rate (MTXR)\n", 248 pkg_stats->max_tx_rate); 249 seq_printf(m, " %8ld frames/s max rx rate (MRXR)\n", 250 pkg_stats->max_rx_rate); 251 252 seq_putc(m, '\n'); 253 } 254 255 seq_printf(m, " %8ld current receive list entries (CRCV)\n", 256 rcv_lists_stats->rcv_entries); 257 seq_printf(m, " %8ld maximum receive list entries (MRCV)\n", 258 rcv_lists_stats->rcv_entries_max); 259 260 if (rcv_lists_stats->stats_reset) 261 seq_printf(m, "\n %8ld statistic resets (STR)\n", 262 rcv_lists_stats->stats_reset); 263 264 if (rcv_lists_stats->user_reset) 265 seq_printf(m, " %8ld user statistic resets (USTR)\n", 266 rcv_lists_stats->user_reset); 267 268 seq_putc(m, '\n'); 269 return 0; 270 } 271 can_reset_stats_proc_show(struct seq_file * m,void * v)272 static int can_reset_stats_proc_show(struct seq_file *m, void *v) 273 { 274 struct net *net = m->private; 275 struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats; 276 struct can_pkg_stats *pkg_stats = net->can.pkg_stats; 277 278 user_reset = 1; 279 280 if (net->can.stattimer.function == can_stat_update) { 281 seq_printf(m, "Scheduled statistic reset #%ld.\n", 282 rcv_lists_stats->stats_reset + 1); 283 } else { 284 if (pkg_stats->jiffies_init != jiffies) 285 can_init_stats(net); 286 287 seq_printf(m, "Performed statistic reset #%ld.\n", 288 rcv_lists_stats->stats_reset); 289 } 290 return 0; 291 } 292 can_rcvlist_proc_show_one(struct seq_file * m,int idx,struct net_device * dev,struct can_dev_rcv_lists * dev_rcv_lists)293 static inline void can_rcvlist_proc_show_one(struct seq_file *m, int idx, 294 struct net_device *dev, 295 struct can_dev_rcv_lists *dev_rcv_lists) 296 { 297 if (!hlist_empty(&dev_rcv_lists->rx[idx])) { 298 can_print_recv_banner(m); 299 can_print_rcvlist(m, &dev_rcv_lists->rx[idx], dev); 300 } else 301 seq_printf(m, " (%s: no entry)\n", DNAME(dev)); 302 303 } 304 can_rcvlist_proc_show(struct seq_file * m,void * v)305 static int can_rcvlist_proc_show(struct seq_file *m, void *v) 306 { 307 /* double cast to prevent GCC warning */ 308 int idx = (int)(long)pde_data(m->file->f_inode); 309 struct net_device *dev; 310 struct can_dev_rcv_lists *dev_rcv_lists; 311 struct net *net = m->private; 312 313 seq_printf(m, "\nreceive list '%s':\n", rx_list_name[idx]); 314 315 rcu_read_lock(); 316 317 /* receive list for 'all' CAN devices (dev == NULL) */ 318 dev_rcv_lists = net->can.rx_alldev_list; 319 can_rcvlist_proc_show_one(m, idx, NULL, dev_rcv_lists); 320 321 /* receive list for registered CAN devices */ 322 for_each_netdev_rcu(net, dev) { 323 struct can_ml_priv *can_ml = can_get_ml_priv(dev); 324 325 if (can_ml) 326 can_rcvlist_proc_show_one(m, idx, dev, 327 &can_ml->dev_rcv_lists); 328 } 329 330 rcu_read_unlock(); 331 332 seq_putc(m, '\n'); 333 return 0; 334 } 335 can_rcvlist_proc_show_array(struct seq_file * m,struct net_device * dev,struct hlist_head * rcv_array,unsigned int rcv_array_sz)336 static inline void can_rcvlist_proc_show_array(struct seq_file *m, 337 struct net_device *dev, 338 struct hlist_head *rcv_array, 339 unsigned int rcv_array_sz) 340 { 341 unsigned int i; 342 int all_empty = 1; 343 344 /* check whether at least one list is non-empty */ 345 for (i = 0; i < rcv_array_sz; i++) 346 if (!hlist_empty(&rcv_array[i])) { 347 all_empty = 0; 348 break; 349 } 350 351 if (!all_empty) { 352 can_print_recv_banner(m); 353 for (i = 0; i < rcv_array_sz; i++) { 354 if (!hlist_empty(&rcv_array[i])) 355 can_print_rcvlist(m, &rcv_array[i], dev); 356 } 357 } else 358 seq_printf(m, " (%s: no entry)\n", DNAME(dev)); 359 } 360 can_rcvlist_sff_proc_show(struct seq_file * m,void * v)361 static int can_rcvlist_sff_proc_show(struct seq_file *m, void *v) 362 { 363 struct net_device *dev; 364 struct can_dev_rcv_lists *dev_rcv_lists; 365 struct net *net = m->private; 366 367 /* RX_SFF */ 368 seq_puts(m, "\nreceive list 'rx_sff':\n"); 369 370 rcu_read_lock(); 371 372 /* sff receive list for 'all' CAN devices (dev == NULL) */ 373 dev_rcv_lists = net->can.rx_alldev_list; 374 can_rcvlist_proc_show_array(m, NULL, dev_rcv_lists->rx_sff, 375 ARRAY_SIZE(dev_rcv_lists->rx_sff)); 376 377 /* sff receive list for registered CAN devices */ 378 for_each_netdev_rcu(net, dev) { 379 struct can_ml_priv *can_ml = can_get_ml_priv(dev); 380 381 if (can_ml) { 382 dev_rcv_lists = &can_ml->dev_rcv_lists; 383 can_rcvlist_proc_show_array(m, dev, dev_rcv_lists->rx_sff, 384 ARRAY_SIZE(dev_rcv_lists->rx_sff)); 385 } 386 } 387 388 rcu_read_unlock(); 389 390 seq_putc(m, '\n'); 391 return 0; 392 } 393 can_rcvlist_eff_proc_show(struct seq_file * m,void * v)394 static int can_rcvlist_eff_proc_show(struct seq_file *m, void *v) 395 { 396 struct net_device *dev; 397 struct can_dev_rcv_lists *dev_rcv_lists; 398 struct net *net = m->private; 399 400 /* RX_EFF */ 401 seq_puts(m, "\nreceive list 'rx_eff':\n"); 402 403 rcu_read_lock(); 404 405 /* eff receive list for 'all' CAN devices (dev == NULL) */ 406 dev_rcv_lists = net->can.rx_alldev_list; 407 can_rcvlist_proc_show_array(m, NULL, dev_rcv_lists->rx_eff, 408 ARRAY_SIZE(dev_rcv_lists->rx_eff)); 409 410 /* eff receive list for registered CAN devices */ 411 for_each_netdev_rcu(net, dev) { 412 struct can_ml_priv *can_ml = can_get_ml_priv(dev); 413 414 if (can_ml) { 415 dev_rcv_lists = &can_ml->dev_rcv_lists; 416 can_rcvlist_proc_show_array(m, dev, dev_rcv_lists->rx_eff, 417 ARRAY_SIZE(dev_rcv_lists->rx_eff)); 418 } 419 } 420 421 rcu_read_unlock(); 422 423 seq_putc(m, '\n'); 424 return 0; 425 } 426 427 /* 428 * can_init_proc - create main CAN proc directory and procfs entries 429 */ can_init_proc(struct net * net)430 void can_init_proc(struct net *net) 431 { 432 /* create /proc/net/can directory */ 433 net->can.proc_dir = proc_net_mkdir(net, "can", net->proc_net); 434 435 if (!net->can.proc_dir) { 436 printk(KERN_INFO "can: failed to create /proc/net/can . " 437 "CONFIG_PROC_FS missing?\n"); 438 return; 439 } 440 441 /* own procfs entries from the AF_CAN core */ 442 net->can.pde_stats = proc_create_net_single(CAN_PROC_STATS, 0644, 443 net->can.proc_dir, can_stats_proc_show, NULL); 444 net->can.pde_reset_stats = proc_create_net_single(CAN_PROC_RESET_STATS, 445 0644, net->can.proc_dir, can_reset_stats_proc_show, 446 NULL); 447 net->can.pde_rcvlist_err = proc_create_net_single(CAN_PROC_RCVLIST_ERR, 448 0644, net->can.proc_dir, can_rcvlist_proc_show, 449 (void *)RX_ERR); 450 net->can.pde_rcvlist_all = proc_create_net_single(CAN_PROC_RCVLIST_ALL, 451 0644, net->can.proc_dir, can_rcvlist_proc_show, 452 (void *)RX_ALL); 453 net->can.pde_rcvlist_fil = proc_create_net_single(CAN_PROC_RCVLIST_FIL, 454 0644, net->can.proc_dir, can_rcvlist_proc_show, 455 (void *)RX_FIL); 456 net->can.pde_rcvlist_inv = proc_create_net_single(CAN_PROC_RCVLIST_INV, 457 0644, net->can.proc_dir, can_rcvlist_proc_show, 458 (void *)RX_INV); 459 net->can.pde_rcvlist_eff = proc_create_net_single(CAN_PROC_RCVLIST_EFF, 460 0644, net->can.proc_dir, can_rcvlist_eff_proc_show, NULL); 461 net->can.pde_rcvlist_sff = proc_create_net_single(CAN_PROC_RCVLIST_SFF, 462 0644, net->can.proc_dir, can_rcvlist_sff_proc_show, NULL); 463 } 464 465 /* 466 * can_remove_proc - remove procfs entries and main CAN proc directory 467 */ can_remove_proc(struct net * net)468 void can_remove_proc(struct net *net) 469 { 470 if (!net->can.proc_dir) 471 return; 472 473 if (net->can.pde_stats) 474 remove_proc_entry(CAN_PROC_STATS, net->can.proc_dir); 475 476 if (net->can.pde_reset_stats) 477 remove_proc_entry(CAN_PROC_RESET_STATS, net->can.proc_dir); 478 479 if (net->can.pde_rcvlist_err) 480 remove_proc_entry(CAN_PROC_RCVLIST_ERR, net->can.proc_dir); 481 482 if (net->can.pde_rcvlist_all) 483 remove_proc_entry(CAN_PROC_RCVLIST_ALL, net->can.proc_dir); 484 485 if (net->can.pde_rcvlist_fil) 486 remove_proc_entry(CAN_PROC_RCVLIST_FIL, net->can.proc_dir); 487 488 if (net->can.pde_rcvlist_inv) 489 remove_proc_entry(CAN_PROC_RCVLIST_INV, net->can.proc_dir); 490 491 if (net->can.pde_rcvlist_eff) 492 remove_proc_entry(CAN_PROC_RCVLIST_EFF, net->can.proc_dir); 493 494 if (net->can.pde_rcvlist_sff) 495 remove_proc_entry(CAN_PROC_RCVLIST_SFF, net->can.proc_dir); 496 497 remove_proc_entry("can", net->proc_net); 498 } 499