drivers/net/bonding/bond_sysfs.c

   1 /*
   2  * Copyright(c) 2004-2005 Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the
   6  * Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, see <http://www.gnu.org/licenses/>.
  16  *
  17  * The full GNU General Public License is included in this distribution in the
  18  * file called LICENSE.
  19  *
  20  */
  21
  22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  23
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/device.h>
  27 #include <linux/sched.h>
  28 #include <linux/fs.h>
  29 #include <linux/types.h>
  30 #include <linux/string.h>
  31 #include <linux/netdevice.h>
  32 #include <linux/inetdevice.h>
  33 #include <linux/in.h>
  34 #include <linux/sysfs.h>
  35 #include <linux/ctype.h>
  36 #include <linux/inet.h>
  37 #include <linux/rtnetlink.h>
  38 #include <linux/etherdevice.h>
  39 #include <net/net_namespace.h>
  40 #include <net/netns/generic.h>
  41 #include <linux/nsproxy.h>
  42
  43 #include "bonding.h"
  44
  45 #define to_dev(obj)     container_of(obj, struct device, kobj)
  46 #define to_bond(cd)     ((struct bonding *)(netdev_priv(to_net_dev(cd))))
  47
  48 /*
  49  * "show" function for the bond_masters attribute.
  50  * The class parameter is ignored.
  51  */
  52 static ssize_t bonding_show_bonds(struct class *cls,
  53                                   struct class_attribute *attr,
  54                                   char *buf)
  55 {
  56         struct bond_net *bn =
  57                 container_of(attr, struct bond_net, class_attr_bonding_masters);
  58         int res = 0;
  59         struct bonding *bond;
  60
  61         rtnl_lock();
  62
  63         list_for_each_entry(bond, &bn->dev_list, bond_list) {
  64                 if (res > (PAGE_SIZE - IFNAMSIZ)) {
  65                         /* not enough space for another interface name */
  66                         if ((PAGE_SIZE - res) > 10)
  67                                 res = PAGE_SIZE - 10;
  68                         res += sprintf(buf + res, "++more++ ");
  69                         break;
  70                 }
  71                 res += sprintf(buf + res, "%s ", bond->dev->name);
  72         }
  73         if (res)
  74                 buf[res-1] = '\n'; /* eat the leftover space */
  75
  76         rtnl_unlock();
  77         return res;
  78 }
  79
  80 static struct net_device *bond_get_by_name(struct bond_net *bn, const char *ifname)
  81 {
  82         struct bonding *bond;
  83
  84         list_for_each_entry(bond, &bn->dev_list, bond_list) {
  85                 if (strncmp(bond->dev->name, ifname, IFNAMSIZ) == 0)
  86                         return bond->dev;
  87         }
  88         return NULL;
  89 }
  90
  91 /*
  92  * "store" function for the bond_masters attribute.  This is what
  93  * creates and deletes entire bonds.
  94  *
  95  * The class parameter is ignored.
  96  *
  97  */
  98
  99 static ssize_t bonding_store_bonds(struct class *cls,
 100                                    struct class_attribute *attr,
 101                                    const char *buffer, size_t count)
 102 {
 103         struct bond_net *bn =
 104                 container_of(attr, struct bond_net, class_attr_bonding_masters);
 105         char command[IFNAMSIZ + 1] = {0, };
 106         char *ifname;
 107         int rv, res = count;
 108
 109         sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
 110         ifname = command + 1;
 111         if ((strlen(command) <= 1) ||
 112             !dev_valid_name(ifname))
 113                 goto err_no_cmd;
 114
 115         if (command[0] == '+') {
 116                 pr_info("%s is being created...\n", ifname);
 117                 rv = bond_create(bn->net, ifname);
 118                 if (rv) {
 119                         if (rv == -EEXIST)
 120                                 pr_info("%s already exists.\n", ifname);
 121                         else
 122                                 pr_info("%s creation failed.\n", ifname);
 123                         res = rv;
 124                 }
 125         } else if (command[0] == '-') {
 126                 struct net_device *bond_dev;
 127
 128                 rtnl_lock();
 129                 bond_dev = bond_get_by_name(bn, ifname);
 130                 if (bond_dev) {
 131                         pr_info("%s is being deleted...\n", ifname);
 132                         unregister_netdevice(bond_dev);
 133                 } else {
 134                         pr_err("unable to delete non-existent %s\n", ifname);
 135                         res = -ENODEV;
 136                 }
 137                 rtnl_unlock();
 138         } else
 139                 goto err_no_cmd;
 140
 141         /* Always return either count or an error.  If you return 0, you'll
 142          * get called forever, which is bad.
 143          */
 144         return res;
 145
 146 err_no_cmd:
 147         pr_err("no command found in bonding_masters. Use +ifname or -ifname.\n");
 148         return -EPERM;
 149 }
 150
 151 /* class attribute for bond_masters file.  This ends up in /sys/class/net */
 152 static const struct class_attribute class_attr_bonding_masters = {
 153         .attr = {
 154                 .name = "bonding_masters",
 155                 .mode = S_IWUSR | S_IRUGO,
 156         },
 157         .show = bonding_show_bonds,
 158         .store = bonding_store_bonds,
 159 };
 160
 161 /*
 162  * Show the slaves in the current bond.
 163  */
 164 static ssize_t bonding_show_slaves(struct device *d,
 165                                    struct device_attribute *attr, char *buf)
 166 {
 167         struct bonding *bond = to_bond(d);
 168         struct list_head *iter;
 169         struct slave *slave;
 170         int res = 0;
 171
 172         if (!rtnl_trylock())
 173                 return restart_syscall();
 174
 175         bond_for_each_slave(bond, slave, iter) {
 176                 if (res > (PAGE_SIZE - IFNAMSIZ)) {
 177                         /* not enough space for another interface name */
 178                         if ((PAGE_SIZE - res) > 10)
 179                                 res = PAGE_SIZE - 10;
 180                         res += sprintf(buf + res, "++more++ ");
 181                         break;
 182                 }
 183                 res += sprintf(buf + res, "%s ", slave->dev->name);
 184         }
 185
 186         rtnl_unlock();
 187
 188         if (res)
 189                 buf[res-1] = '\n'; /* eat the leftover space */
 190
 191         return res;
 192 }
 193
 194 /*
 195  * Set the slaves in the current bond.
 196  * This is supposed to be only thin wrapper for bond_enslave and bond_release.
 197  * All hard work should be done there.
 198  */
 199 static ssize_t bonding_store_slaves(struct device *d,
 200                                     struct device_attribute *attr,
 201                                     const char *buffer, size_t count)
 202 {
 203         char command[IFNAMSIZ + 1] = { 0, };
 204         char *ifname;
 205         int res, ret = count;
 206         struct net_device *dev;
 207         struct bonding *bond = to_bond(d);
 208
 209         if (!rtnl_trylock())
 210                 return restart_syscall();
 211
 212         sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
 213         ifname = command + 1;
 214         if ((strlen(command) <= 1) ||
 215             !dev_valid_name(ifname))
 216                 goto err_no_cmd;
 217
 218         dev = __dev_get_by_name(dev_net(bond->dev), ifname);
 219         if (!dev) {
 220                 pr_info("%s: Interface %s does not exist!\n",
 221                         bond->dev->name, ifname);
 222                 ret = -ENODEV;
 223                 goto out;
 224         }
 225
 226         switch (command[0]) {
 227         case '+':
 228                 pr_info("%s: Adding slave %s.\n", bond->dev->name, dev->name);
 229                 res = bond_enslave(bond->dev, dev);
 230                 break;
 231
 232         case '-':
 233                 pr_info("%s: Removing slave %s.\n", bond->dev->name, dev->name);
 234                 res = bond_release(bond->dev, dev);
 235                 break;
 236
 237         default:
 238                 goto err_no_cmd;
 239         }
 240
 241         if (res)
 242                 ret = res;
 243         goto out;
 244
 245 err_no_cmd:
 246         pr_err("no command found in slaves file for bond %s. Use +ifname or -ifname.\n",
 247                bond->dev->name);
 248         ret = -EPERM;
 249
 250 out:
 251         rtnl_unlock();
 252         return ret;
 253 }
 254
 255 static DEVICE_ATTR(slaves, S_IRUGO | S_IWUSR, bonding_show_slaves,
 256                    bonding_store_slaves);
 257
 258 /*
 259  * Show and set the bonding mode.  The bond interface must be down to
 260  * change the mode.
 261  */
 262 static ssize_t bonding_show_mode(struct device *d,
 263                                  struct device_attribute *attr, char *buf)
 264 {
 265         struct bonding *bond = to_bond(d);
 266         struct bond_opt_value *val;
 267
 268         val = bond_opt_get_val(BOND_OPT_MODE, bond->params.mode);
 269
 270         return sprintf(buf, "%s %d\n", val->string, bond->params.mode);
 271 }
 272
 273 static ssize_t bonding_store_mode(struct device *d,
 274                                   struct device_attribute *attr,
 275                                   const char *buf, size_t count)
 276 {
 277         struct bonding *bond = to_bond(d);
 278         int ret;
 279
 280         ret = bond_opt_tryset_rtnl(bond, BOND_OPT_MODE, (char *)buf);
 281         if (!ret)
 282                 ret = count;
 283
 284         return ret;
 285 }
 286 static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
 287                    bonding_show_mode, bonding_store_mode);
 288
 289 /*
 290  * Show and set the bonding transmit hash method.
 291  */
 292 static ssize_t bonding_show_xmit_hash(struct device *d,
 293                                       struct device_attribute *attr,
 294                                       char *buf)
 295 {
 296         struct bonding *bond = to_bond(d);
 297         struct bond_opt_value *val;
 298
 299         val = bond_opt_get_val(BOND_OPT_XMIT_HASH, bond->params.xmit_policy);
 300
 301         return sprintf(buf, "%s %d\n", val->string, bond->params.xmit_policy);
 302 }
 303
 304 static ssize_t bonding_store_xmit_hash(struct device *d,
 305                                        struct device_attribute *attr,
 306                                        const char *buf, size_t count)
 307 {
 308         struct bonding *bond = to_bond(d);
 309         int ret;
 310
 311         ret = bond_opt_tryset_rtnl(bond, BOND_OPT_XMIT_HASH, (char *)buf);
 312         if (!ret)
 313                 ret = count;
 314
 315         return ret;
 316 }
 317 static DEVICE_ATTR(xmit_hash_policy, S_IRUGO | S_IWUSR,
 318                    bonding_show_xmit_hash, bonding_store_xmit_hash);
 319
 320 /*
 321  * Show and set arp_validate.
 322  */
 323 static ssize_t bonding_show_arp_validate(struct device *d,
 324                                          struct device_attribute *attr,
 325                                          char *buf)
 326 {
 327         struct bonding *bond = to_bond(d);
 328         struct bond_opt_value *val;
 329
 330         val = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
 331                                bond->params.arp_validate);
 332
 333         return sprintf(buf, "%s %d\n", val->string, bond->params.arp_validate);
 334 }
 335
 336 static ssize_t bonding_store_arp_validate(struct device *d,
 337                                           struct device_attribute *attr,
 338                                           const char *buf, size_t count)
 339 {
 340         struct bonding *bond = to_bond(d);
 341         int ret;
 342
 343         ret = bond_opt_tryset_rtnl(bond, BOND_OPT_ARP_VALIDATE, (char *)buf);
 344         if (!ret)
 345                 ret = count;
 346
 347         return ret;
 348 }
 349
 350 static DEVICE_ATTR(arp_validate, S_IRUGO | S_IWUSR, bonding_show_arp_validate,
 351                    bonding_store_arp_validate);
 352 /*
 353  * Show and set arp_all_targets.
 354  */
 355 static ssize_t bonding_show_arp_all_targets(struct device *d,
 356                                          struct device_attribute *attr,
 357                                          char *buf)
 358 {
 359         struct bonding *bond = to_bond(d);
 360         int value = bond->params.arp_all_targets;
 361
 362         return sprintf(buf, "%s %d\n", arp_all_targets_tbl[value].modename,
 363                        value);
 364 }
 365
 366 static ssize_t bonding_store_arp_all_targets(struct device *d,
 367                                           struct device_attribute *attr,
 368                                           const char *buf, size_t count)
 369 {
 370         struct bonding *bond = to_bond(d);
 371         int new_value, ret;
 372
 373         new_value = bond_parse_parm(buf, arp_all_targets_tbl);
 374         if (new_value < 0) {
 375                 pr_err("%s: Ignoring invalid arp_all_targets value %s\n",
 376                        bond->dev->name, buf);
 377                 return -EINVAL;
 378         }
 379
 380         if (!rtnl_trylock())
 381                 return restart_syscall();
 382
 383         ret = bond_option_arp_all_targets_set(bond, new_value);
 384         if (!ret)
 385                 ret = count;
 386
 387         rtnl_unlock();
 388
 389         return ret;
 390 }
 391
 392 static DEVICE_ATTR(arp_all_targets, S_IRUGO | S_IWUSR,
 393                    bonding_show_arp_all_targets, bonding_store_arp_all_targets);
 394
 395 /*
 396  * Show and store fail_over_mac.  User only allowed to change the
 397  * value when there are no slaves.
 398  */
 399 static ssize_t bonding_show_fail_over_mac(struct device *d,
 400                                           struct device_attribute *attr,
 401                                           char *buf)
 402 {
 403         struct bonding *bond = to_bond(d);
 404
 405         return sprintf(buf, "%s %d\n",
 406                        fail_over_mac_tbl[bond->params.fail_over_mac].modename,
 407                        bond->params.fail_over_mac);
 408 }
 409
 410 static ssize_t bonding_store_fail_over_mac(struct device *d,
 411                                            struct device_attribute *attr,
 412                                            const char *buf, size_t count)
 413 {
 414         int new_value, ret;
 415         struct bonding *bond = to_bond(d);
 416
 417         new_value = bond_parse_parm(buf, fail_over_mac_tbl);
 418         if (new_value < 0) {
 419                 pr_err("%s: Ignoring invalid fail_over_mac value %s.\n",
 420                        bond->dev->name, buf);
 421                 return -EINVAL;
 422         }
 423
 424         if (!rtnl_trylock())
 425                 return restart_syscall();
 426
 427         ret = bond_option_fail_over_mac_set(bond, new_value);
 428         if (!ret)
 429                 ret = count;
 430
 431         rtnl_unlock();
 432         return ret;
 433 }
 434
 435 static DEVICE_ATTR(fail_over_mac, S_IRUGO | S_IWUSR,
 436                    bonding_show_fail_over_mac, bonding_store_fail_over_mac);
 437
 438 /*
 439  * Show and set the arp timer interval.  There are two tricky bits
 440  * here.  First, if ARP monitoring is activated, then we must disable
 441  * MII monitoring.  Second, if the ARP timer isn't running, we must
 442  * start it.
 443  */
 444 static ssize_t bonding_show_arp_interval(struct device *d,
 445                                          struct device_attribute *attr,
 446                                          char *buf)
 447 {
 448         struct bonding *bond = to_bond(d);
 449
 450         return sprintf(buf, "%d\n", bond->params.arp_interval);
 451 }
 452
 453 static ssize_t bonding_store_arp_interval(struct device *d,
 454                                           struct device_attribute *attr,
 455                                           const char *buf, size_t count)
 456 {
 457         struct bonding *bond = to_bond(d);
 458         int new_value, ret;
 459
 460         if (sscanf(buf, "%d", &new_value) != 1) {
 461                 pr_err("%s: no arp_interval value specified.\n",
 462                 bond->dev->name);
 463                 return -EINVAL;
 464         }
 465
 466         if (!rtnl_trylock())
 467                 return restart_syscall();
 468
 469         ret = bond_option_arp_interval_set(bond, new_value);
 470         if (!ret)
 471                 ret = count;
 472
 473         rtnl_unlock();
 474         return ret;
 475 }
 476 static DEVICE_ATTR(arp_interval, S_IRUGO | S_IWUSR,
 477                    bonding_show_arp_interval, bonding_store_arp_interval);
 478
 479 /*
 480  * Show and set the arp targets.
 481  */
 482 static ssize_t bonding_show_arp_targets(struct device *d,
 483                                         struct device_attribute *attr,
 484                                         char *buf)
 485 {
 486         int i, res = 0;
 487         struct bonding *bond = to_bond(d);
 488
 489         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) {
 490                 if (bond->params.arp_targets[i])
 491                         res += sprintf(buf + res, "%pI4 ",
 492                                        &bond->params.arp_targets[i]);
 493         }
 494         if (res)
 495                 buf[res-1] = '\n'; /* eat the leftover space */
 496         return res;
 497 }
 498
 499 static ssize_t bonding_store_arp_targets(struct device *d,
 500                                          struct device_attribute *attr,
 501                                          const char *buf, size_t count)
 502 {
 503         struct bonding *bond = to_bond(d);
 504         __be32 target;
 505         int ret = -EPERM;
 506
 507         if (!in4_pton(buf + 1, -1, (u8 *)&target, -1, NULL)) {
 508                 pr_err("%s: invalid ARP target %pI4 specified\n",
 509                        bond->dev->name, &target);
 510                 return -EPERM;
 511         }
 512
 513         if (!rtnl_trylock())
 514                 return restart_syscall();
 515
 516         if (buf[0] == '+')
 517                 ret = bond_option_arp_ip_target_add(bond, target);
 518         else if (buf[0] == '-')
 519                 ret = bond_option_arp_ip_target_rem(bond, target);
 520         else
 521                 pr_err("no command found in arp_ip_targets file for bond %s. Use +<addr> or -<addr>.\n",
 522                        bond->dev->name);
 523
 524         if (!ret)
 525                 ret = count;
 526
 527         rtnl_unlock();
 528         return ret;
 529 }
 530 static DEVICE_ATTR(arp_ip_target, S_IRUGO | S_IWUSR , bonding_show_arp_targets, bonding_store_arp_targets);
 531
 532 /*
 533  * Show and set the up and down delays.  These must be multiples of the
 534  * MII monitoring value, and are stored internally as the multiplier.
 535  * Thus, we must translate to MS for the real world.
 536  */
 537 static ssize_t bonding_show_downdelay(struct device *d,
 538                                       struct device_attribute *attr,
 539                                       char *buf)
 540 {
 541         struct bonding *bond = to_bond(d);
 542
 543         return sprintf(buf, "%d\n", bond->params.downdelay * bond->params.miimon);
 544 }
 545
 546 static ssize_t bonding_store_downdelay(struct device *d,
 547                                        struct device_attribute *attr,
 548                                        const char *buf, size_t count)
 549 {
 550         int new_value, ret;
 551         struct bonding *bond = to_bond(d);
 552
 553         if (sscanf(buf, "%d", &new_value) != 1) {
 554                 pr_err("%s: no down delay value specified.\n", bond->dev->name);
 555                 return -EINVAL;
 556         }
 557
 558         if (!rtnl_trylock())
 559                 return restart_syscall();
 560
 561         ret = bond_option_downdelay_set(bond, new_value);
 562         if (!ret)
 563                 ret = count;
 564
 565         rtnl_unlock();
 566         return ret;
 567 }
 568 static DEVICE_ATTR(downdelay, S_IRUGO | S_IWUSR,
 569                    bonding_show_downdelay, bonding_store_downdelay);
 570
 571 static ssize_t bonding_show_updelay(struct device *d,
 572                                     struct device_attribute *attr,
 573                                     char *buf)
 574 {
 575         struct bonding *bond = to_bond(d);
 576
 577         return sprintf(buf, "%d\n", bond->params.updelay * bond->params.miimon);
 578
 579 }
 580
 581 static ssize_t bonding_store_updelay(struct device *d,
 582                                      struct device_attribute *attr,
 583                                      const char *buf, size_t count)
 584 {
 585         int new_value, ret;
 586         struct bonding *bond = to_bond(d);
 587
 588         if (sscanf(buf, "%d", &new_value) != 1) {
 589                 pr_err("%s: no up delay value specified.\n",
 590                 bond->dev->name);
 591                 return -EINVAL;
 592         }
 593
 594         if (!rtnl_trylock())
 595                 return restart_syscall();
 596
 597         ret = bond_option_updelay_set(bond, new_value);
 598         if (!ret)
 599                 ret = count;
 600
 601         rtnl_unlock();
 602         return ret;
 603 }
 604 static DEVICE_ATTR(updelay, S_IRUGO | S_IWUSR,
 605                    bonding_show_updelay, bonding_store_updelay);
 606
 607 /*
 608  * Show and set the LACP interval.  Interface must be down, and the mode
 609  * must be set to 802.3ad mode.
 610  */
 611 static ssize_t bonding_show_lacp(struct device *d,
 612                                  struct device_attribute *attr,
 613                                  char *buf)
 614 {
 615         struct bonding *bond = to_bond(d);
 616
 617         return sprintf(buf, "%s %d\n",
 618                 bond_lacp_tbl[bond->params.lacp_fast].modename,
 619                 bond->params.lacp_fast);
 620 }
 621
 622 static ssize_t bonding_store_lacp(struct device *d,
 623                                   struct device_attribute *attr,
 624                                   const char *buf, size_t count)
 625 {
 626         struct bonding *bond = to_bond(d);
 627         int new_value, ret;
 628
 629         new_value = bond_parse_parm(buf, bond_lacp_tbl);
 630         if (new_value < 0) {
 631                 pr_err("%s: Ignoring invalid LACP rate value %.*s.\n",
 632                        bond->dev->name, (int)strlen(buf) - 1, buf);
 633                 return -EINVAL;
 634         }
 635
 636         if (!rtnl_trylock())
 637                 return restart_syscall();
 638
 639         ret = bond_option_lacp_rate_set(bond, new_value);
 640         if (!ret)
 641                 ret = count;
 642
 643         rtnl_unlock();
 644         return ret;
 645 }
 646 static DEVICE_ATTR(lacp_rate, S_IRUGO | S_IWUSR,
 647                    bonding_show_lacp, bonding_store_lacp);
 648
 649 static ssize_t bonding_show_min_links(struct device *d,
 650                                       struct device_attribute *attr,
 651                                       char *buf)
 652 {
 653         struct bonding *bond = to_bond(d);
 654
 655         return sprintf(buf, "%d\n", bond->params.min_links);
 656 }
 657
 658 static ssize_t bonding_store_min_links(struct device *d,
 659                                        struct device_attribute *attr,
 660                                        const char *buf, size_t count)
 661 {
 662         struct bonding *bond = to_bond(d);
 663         int ret;
 664         unsigned int new_value;
 665
 666         ret = kstrtouint(buf, 0, &new_value);
 667         if (ret < 0) {
 668                 pr_err("%s: Ignoring invalid min links value %s.\n",
 669                        bond->dev->name, buf);
 670                 return ret;
 671         }
 672
 673         if (!rtnl_trylock())
 674                 return restart_syscall();
 675
 676         ret = bond_option_min_links_set(bond, new_value);
 677         if (!ret)
 678                 ret = count;
 679
 680         rtnl_unlock();
 681         return ret;
 682 }
 683 static DEVICE_ATTR(min_links, S_IRUGO | S_IWUSR,
 684                    bonding_show_min_links, bonding_store_min_links);
 685
 686 static ssize_t bonding_show_ad_select(struct device *d,
 687                                       struct device_attribute *attr,
 688                                       char *buf)
 689 {
 690         struct bonding *bond = to_bond(d);
 691
 692         return sprintf(buf, "%s %d\n",
 693                 ad_select_tbl[bond->params.ad_select].modename,
 694                 bond->params.ad_select);
 695 }
 696
 697
 698 static ssize_t bonding_store_ad_select(struct device *d,
 699                                        struct device_attribute *attr,
 700                                        const char *buf, size_t count)
 701 {
 702         int new_value, ret;
 703         struct bonding *bond = to_bond(d);
 704
 705         new_value = bond_parse_parm(buf, ad_select_tbl);
 706         if (new_value < 0) {
 707                 pr_err("%s: Ignoring invalid ad_select value %.*s.\n",
 708                        bond->dev->name, (int)strlen(buf) - 1, buf);
 709                 return -EINVAL;
 710         }
 711
 712         if (!rtnl_trylock())
 713                 return restart_syscall();
 714
 715         ret = bond_option_ad_select_set(bond, new_value);
 716         if (!ret)
 717                 ret = count;
 718
 719         rtnl_unlock();
 720         return ret;
 721 }
 722 static DEVICE_ATTR(ad_select, S_IRUGO | S_IWUSR,
 723                    bonding_show_ad_select, bonding_store_ad_select);
 724
 725 /*
 726  * Show and set the number of peer notifications to send after a failover event.
 727  */
 728 static ssize_t bonding_show_num_peer_notif(struct device *d,
 729                                            struct device_attribute *attr,
 730                                            char *buf)
 731 {
 732         struct bonding *bond = to_bond(d);
 733         return sprintf(buf, "%d\n", bond->params.num_peer_notif);
 734 }
 735
 736 static ssize_t bonding_store_num_peer_notif(struct device *d,
 737                                             struct device_attribute *attr,
 738                                             const char *buf, size_t count)
 739 {
 740         struct bonding *bond = to_bond(d);
 741         u8 new_value;
 742         int ret;
 743
 744         ret = kstrtou8(buf, 10, &new_value);
 745         if (ret) {
 746                 pr_err("%s: invalid value %s specified.\n",
 747                        bond->dev->name, buf);
 748                 return ret;
 749         }
 750
 751         if (!rtnl_trylock())
 752                 return restart_syscall();
 753
 754         ret = bond_option_num_peer_notif_set(bond, new_value);
 755         if (!ret)
 756                 ret = count;
 757
 758         rtnl_unlock();
 759         return ret;
 760 }
 761 static DEVICE_ATTR(num_grat_arp, S_IRUGO | S_IWUSR,
 762                    bonding_show_num_peer_notif, bonding_store_num_peer_notif);
 763 static DEVICE_ATTR(num_unsol_na, S_IRUGO | S_IWUSR,
 764                    bonding_show_num_peer_notif, bonding_store_num_peer_notif);
 765
 766 /*
 767  * Show and set the MII monitor interval.  There are two tricky bits
 768  * here.  First, if MII monitoring is activated, then we must disable
 769  * ARP monitoring.  Second, if the timer isn't running, we must
 770  * start it.
 771  */
 772 static ssize_t bonding_show_miimon(struct device *d,
 773                                    struct device_attribute *attr,
 774                                    char *buf)
 775 {
 776         struct bonding *bond = to_bond(d);
 777
 778         return sprintf(buf, "%d\n", bond->params.miimon);
 779 }
 780
 781 static ssize_t bonding_store_miimon(struct device *d,
 782                                     struct device_attribute *attr,
 783                                     const char *buf, size_t count)
 784 {
 785         int new_value, ret;
 786         struct bonding *bond = to_bond(d);
 787
 788         if (sscanf(buf, "%d", &new_value) != 1) {
 789                 pr_err("%s: no miimon value specified.\n",
 790                        bond->dev->name);
 791                 return -EINVAL;
 792         }
 793
 794         if (!rtnl_trylock())
 795                 return restart_syscall();
 796
 797         ret = bond_option_miimon_set(bond, new_value);
 798         if (!ret)
 799                 ret = count;
 800
 801         rtnl_unlock();
 802         return ret;
 803 }
 804 static DEVICE_ATTR(miimon, S_IRUGO | S_IWUSR,
 805                    bonding_show_miimon, bonding_store_miimon);
 806
 807 /*
 808  * Show and set the primary slave.  The store function is much
 809  * simpler than bonding_store_slaves function because it only needs to
 810  * handle one interface name.
 811  * The bond must be a mode that supports a primary for this be
 812  * set.
 813  */
 814 static ssize_t bonding_show_primary(struct device *d,
 815                                     struct device_attribute *attr,
 816                                     char *buf)
 817 {
 818         int count = 0;
 819         struct bonding *bond = to_bond(d);
 820
 821         if (bond->primary_slave)
 822                 count = sprintf(buf, "%s\n", bond->primary_slave->dev->name);
 823
 824         return count;
 825 }
 826
 827 static ssize_t bonding_store_primary(struct device *d,
 828                                      struct device_attribute *attr,
 829                                      const char *buf, size_t count)
 830 {
 831         struct bonding *bond = to_bond(d);
 832         char ifname[IFNAMSIZ];
 833         int ret;
 834
 835         sscanf(buf, "%15s", ifname); /* IFNAMSIZ */
 836         if (ifname[0] == '\n')
 837                 ifname[0] = '\0';
 838
 839         if (!rtnl_trylock())
 840                 return restart_syscall();
 841
 842         ret = bond_option_primary_set(bond, ifname);
 843         if (!ret)
 844                 ret = count;
 845
 846         rtnl_unlock();
 847         return ret;
 848 }
 849 static DEVICE_ATTR(primary, S_IRUGO | S_IWUSR,
 850                    bonding_show_primary, bonding_store_primary);
 851
 852 /*
 853  * Show and set the primary_reselect flag.
 854  */
 855 static ssize_t bonding_show_primary_reselect(struct device *d,
 856                                              struct device_attribute *attr,
 857                                              char *buf)
 858 {
 859         struct bonding *bond = to_bond(d);
 860
 861         return sprintf(buf, "%s %d\n",
 862                        pri_reselect_tbl[bond->params.primary_reselect].modename,
 863                        bond->params.primary_reselect);
 864 }
 865
 866 static ssize_t bonding_store_primary_reselect(struct device *d,
 867                                               struct device_attribute *attr,
 868                                               const char *buf, size_t count)
 869 {
 870         int new_value, ret;
 871         struct bonding *bond = to_bond(d);
 872
 873         new_value = bond_parse_parm(buf, pri_reselect_tbl);
 874         if (new_value < 0)  {
 875                 pr_err("%s: Ignoring invalid primary_reselect value %.*s.\n",
 876                        bond->dev->name,
 877                        (int) strlen(buf) - 1, buf);
 878                 return -EINVAL;
 879         }
 880
 881         if (!rtnl_trylock())
 882                 return restart_syscall();
 883
 884         ret = bond_option_primary_reselect_set(bond, new_value);
 885         if (!ret)
 886                 ret = count;
 887
 888         rtnl_unlock();
 889         return ret;
 890 }
 891 static DEVICE_ATTR(primary_reselect, S_IRUGO | S_IWUSR,
 892                    bonding_show_primary_reselect,
 893                    bonding_store_primary_reselect);
 894
 895 /*
 896  * Show and set the use_carrier flag.
 897  */
 898 static ssize_t bonding_show_carrier(struct device *d,
 899                                     struct device_attribute *attr,
 900                                     char *buf)
 901 {
 902         struct bonding *bond = to_bond(d);
 903
 904         return sprintf(buf, "%d\n", bond->params.use_carrier);
 905 }
 906
 907 static ssize_t bonding_store_carrier(struct device *d,
 908                                      struct device_attribute *attr,
 909                                      const char *buf, size_t count)
 910 {
 911         int new_value, ret;
 912         struct bonding *bond = to_bond(d);
 913
 914         if (sscanf(buf, "%d", &new_value) != 1) {
 915                 pr_err("%s: no use_carrier value specified.\n",
 916                        bond->dev->name);
 917                 return -EINVAL;
 918         }
 919
 920         if (!rtnl_trylock())
 921                 return restart_syscall();
 922
 923         ret = bond_option_use_carrier_set(bond, new_value);
 924         if (!ret)
 925                 ret = count;
 926
 927         rtnl_unlock();
 928         return ret;
 929 }
 930 static DEVICE_ATTR(use_carrier, S_IRUGO | S_IWUSR,
 931                    bonding_show_carrier, bonding_store_carrier);
 932
 933
 934 /*
 935  * Show and set currently active_slave.
 936  */
 937 static ssize_t bonding_show_active_slave(struct device *d,
 938                                          struct device_attribute *attr,
 939                                          char *buf)
 940 {
 941         struct bonding *bond = to_bond(d);
 942         struct net_device *slave_dev;
 943         int count = 0;
 944
 945         rcu_read_lock();
 946         slave_dev = bond_option_active_slave_get_rcu(bond);
 947         if (slave_dev)
 948                 count = sprintf(buf, "%s\n", slave_dev->name);
 949         rcu_read_unlock();
 950
 951         return count;
 952 }
 953
 954 static ssize_t bonding_store_active_slave(struct device *d,
 955                                           struct device_attribute *attr,
 956                                           const char *buf, size_t count)
 957 {
 958         int ret;
 959         struct bonding *bond = to_bond(d);
 960         char ifname[IFNAMSIZ];
 961         struct net_device *dev;
 962
 963         if (!rtnl_trylock())
 964                 return restart_syscall();
 965
 966         sscanf(buf, "%15s", ifname); /* IFNAMSIZ */
 967         if (!strlen(ifname) || buf[0] == '\n') {
 968                 dev = NULL;
 969         } else {
 970                 dev = __dev_get_by_name(dev_net(bond->dev), ifname);
 971                 if (!dev) {
 972                         ret = -ENODEV;
 973                         goto out;
 974                 }
 975         }
 976
 977         ret = bond_option_active_slave_set(bond, dev);
 978         if (!ret)
 979                 ret = count;
 980
 981  out:
 982         rtnl_unlock();
 983
 984         return ret;
 985
 986 }
 987 static DEVICE_ATTR(active_slave, S_IRUGO | S_IWUSR,
 988                    bonding_show_active_slave, bonding_store_active_slave);
 989
 990
 991 /*
 992  * Show link status of the bond interface.
 993  */
 994 static ssize_t bonding_show_mii_status(struct device *d,
 995                                        struct device_attribute *attr,
 996                                        char *buf)
 997 {
 998         struct bonding *bond = to_bond(d);
 999
1000         return sprintf(buf, "%s\n", bond->curr_active_slave ? "up" : "down");
1001 }
1002 static DEVICE_ATTR(mii_status, S_IRUGO, bonding_show_mii_status, NULL);
1003
1004 /*
1005  * Show current 802.3ad aggregator ID.
1006  */
1007 static ssize_t bonding_show_ad_aggregator(struct device *d,
1008                                           struct device_attribute *attr,
1009                                           char *buf)
1010 {
1011         int count = 0;
1012         struct bonding *bond = to_bond(d);
1013
1014         if (bond->params.mode == BOND_MODE_8023AD) {
1015                 struct ad_info ad_info;
1016                 count = sprintf(buf, "%d\n",
1017                                 bond_3ad_get_active_agg_info(bond, &ad_info)
1018                                 ?  0 : ad_info.aggregator_id);
1019         }
1020
1021         return count;
1022 }
1023 static DEVICE_ATTR(ad_aggregator, S_IRUGO, bonding_show_ad_aggregator, NULL);
1024
1025
1026 /*
1027  * Show number of active 802.3ad ports.
1028  */
1029 static ssize_t bonding_show_ad_num_ports(struct device *d,
1030                                          struct device_attribute *attr,
1031                                          char *buf)
1032 {
1033         int count = 0;
1034         struct bonding *bond = to_bond(d);
1035
1036         if (bond->params.mode == BOND_MODE_8023AD) {
1037                 struct ad_info ad_info;
1038                 count = sprintf(buf, "%d\n",
1039                                 bond_3ad_get_active_agg_info(bond, &ad_info)
1040                                 ?  0 : ad_info.ports);
1041         }
1042
1043         return count;
1044 }
1045 static DEVICE_ATTR(ad_num_ports, S_IRUGO, bonding_show_ad_num_ports, NULL);
1046
1047
1048 /*
1049  * Show current 802.3ad actor key.
1050  */
1051 static ssize_t bonding_show_ad_actor_key(struct device *d,
1052                                          struct device_attribute *attr,
1053                                          char *buf)
1054 {
1055         int count = 0;
1056         struct bonding *bond = to_bond(d);
1057
1058         if (bond->params.mode == BOND_MODE_8023AD) {
1059                 struct ad_info ad_info;
1060                 count = sprintf(buf, "%d\n",
1061                                 bond_3ad_get_active_agg_info(bond, &ad_info)
1062                                 ?  0 : ad_info.actor_key);
1063         }
1064
1065         return count;
1066 }
1067 static DEVICE_ATTR(ad_actor_key, S_IRUGO, bonding_show_ad_actor_key, NULL);
1068
1069
1070 /*
1071  * Show current 802.3ad partner key.
1072  */
1073 static ssize_t bonding_show_ad_partner_key(struct device *d,
1074                                            struct device_attribute *attr,
1075                                            char *buf)
1076 {
1077         int count = 0;
1078         struct bonding *bond = to_bond(d);
1079
1080         if (bond->params.mode == BOND_MODE_8023AD) {
1081                 struct ad_info ad_info;
1082                 count = sprintf(buf, "%d\n",
1083                                 bond_3ad_get_active_agg_info(bond, &ad_info)
1084                                 ?  0 : ad_info.partner_key);
1085         }
1086
1087         return count;
1088 }
1089 static DEVICE_ATTR(ad_partner_key, S_IRUGO, bonding_show_ad_partner_key, NULL);
1090
1091
1092 /*
1093  * Show current 802.3ad partner mac.
1094  */
1095 static ssize_t bonding_show_ad_partner_mac(struct device *d,
1096                                            struct device_attribute *attr,
1097                                            char *buf)
1098 {
1099         int count = 0;
1100         struct bonding *bond = to_bond(d);
1101
1102         if (bond->params.mode == BOND_MODE_8023AD) {
1103                 struct ad_info ad_info;
1104                 if (!bond_3ad_get_active_agg_info(bond, &ad_info))
1105                         count = sprintf(buf, "%pM\n", ad_info.partner_system);
1106         }
1107
1108         return count;
1109 }
1110 static DEVICE_ATTR(ad_partner_mac, S_IRUGO, bonding_show_ad_partner_mac, NULL);
1111
1112 /*
1113  * Show the queue_ids of the slaves in the current bond.
1114  */
1115 static ssize_t bonding_show_queue_id(struct device *d,
1116                                      struct device_attribute *attr,
1117                                      char *buf)
1118 {
1119         struct bonding *bond = to_bond(d);
1120         struct list_head *iter;
1121         struct slave *slave;
1122         int res = 0;
1123
1124         if (!rtnl_trylock())
1125                 return restart_syscall();
1126
1127         bond_for_each_slave(bond, slave, iter) {
1128                 if (res > (PAGE_SIZE - IFNAMSIZ - 6)) {
1129                         /* not enough space for another interface_name:queue_id pair */
1130                         if ((PAGE_SIZE - res) > 10)
1131                                 res = PAGE_SIZE - 10;
1132                         res += sprintf(buf + res, "++more++ ");
1133                         break;
1134                 }
1135                 res += sprintf(buf + res, "%s:%d ",
1136                                slave->dev->name, slave->queue_id);
1137         }
1138         if (res)
1139                 buf[res-1] = '\n'; /* eat the leftover space */
1140
1141         rtnl_unlock();
1142
1143         return res;
1144 }
1145
1146 /*
1147  * Set the queue_ids of the  slaves in the current bond.  The bond
1148  * interface must be enslaved for this to work.
1149  */
1150 static ssize_t bonding_store_queue_id(struct device *d,
1151                                       struct device_attribute *attr,
1152                                       const char *buffer, size_t count)
1153 {
1154         struct slave *slave, *update_slave;
1155         struct bonding *bond = to_bond(d);
1156         struct list_head *iter;
1157         u16 qid;
1158         int ret = count;
1159         char *delim;
1160         struct net_device *sdev = NULL;
1161
1162         if (!rtnl_trylock())
1163                 return restart_syscall();
1164
1165         /* delim will point to queue id if successful */
1166         delim = strchr(buffer, ':');
1167         if (!delim)
1168                 goto err_no_cmd;
1169
1170         /*
1171          * Terminate string that points to device name and bump it
1172          * up one, so we can read the queue id there.
1173          */
1174         *delim = '\0';
1175         if (sscanf(++delim, "%hd\n", &qid) != 1)
1176                 goto err_no_cmd;
1177
1178         /* Check buffer length, valid ifname and queue id */
1179         if (strlen(buffer) > IFNAMSIZ ||
1180             !dev_valid_name(buffer) ||
1181             qid > bond->dev->real_num_tx_queues)
1182                 goto err_no_cmd;
1183
1184         /* Get the pointer to that interface if it exists */
1185         sdev = __dev_get_by_name(dev_net(bond->dev), buffer);
1186         if (!sdev)
1187                 goto err_no_cmd;
1188
1189         /* Search for thes slave and check for duplicate qids */
1190         update_slave = NULL;
1191         bond_for_each_slave(bond, slave, iter) {
1192                 if (sdev == slave->dev)
1193                         /*
1194                          * We don't need to check the matching
1195                          * slave for dups, since we're overwriting it
1196                          */
1197                         update_slave = slave;
1198                 else if (qid && qid == slave->queue_id) {
1199                         goto err_no_cmd;
1200                 }
1201         }
1202
1203         if (!update_slave)
1204                 goto err_no_cmd;
1205
1206         /* Actually set the qids for the slave */
1207         update_slave->queue_id = qid;
1208
1209 out:
1210         rtnl_unlock();
1211         return ret;
1212
1213 err_no_cmd:
1214         pr_info("invalid input for queue_id set for %s.\n",
1215                 bond->dev->name);
1216         ret = -EPERM;
1217         goto out;
1218 }
1219
1220 static DEVICE_ATTR(queue_id, S_IRUGO | S_IWUSR, bonding_show_queue_id,
1221                    bonding_store_queue_id);
1222
1223
1224 /*
1225  * Show and set the all_slaves_active flag.
1226  */
1227 static ssize_t bonding_show_slaves_active(struct device *d,
1228                                           struct device_attribute *attr,
1229                                           char *buf)
1230 {
1231         struct bonding *bond = to_bond(d);
1232
1233         return sprintf(buf, "%d\n", bond->params.all_slaves_active);
1234 }
1235
1236 static ssize_t bonding_store_slaves_active(struct device *d,
1237                                            struct device_attribute *attr,
1238                                            const char *buf, size_t count)
1239 {
1240         struct bonding *bond = to_bond(d);
1241         int new_value, ret;
1242
1243         if (sscanf(buf, "%d", &new_value) != 1) {
1244                 pr_err("%s: no all_slaves_active value specified.\n",
1245                        bond->dev->name);
1246                 return -EINVAL;
1247         }
1248
1249         if (!rtnl_trylock())
1250                 return restart_syscall();
1251
1252         ret = bond_option_all_slaves_active_set(bond, new_value);
1253         if (!ret)
1254                 ret = count;
1255
1256         rtnl_unlock();
1257         return ret;
1258 }
1259 static DEVICE_ATTR(all_slaves_active, S_IRUGO | S_IWUSR,
1260                    bonding_show_slaves_active, bonding_store_slaves_active);
1261
1262 /*
1263  * Show and set the number of IGMP membership reports to send on link failure
1264  */
1265 static ssize_t bonding_show_resend_igmp(struct device *d,
1266                                         struct device_attribute *attr,
1267                                         char *buf)
1268 {
1269         struct bonding *bond = to_bond(d);
1270
1271         return sprintf(buf, "%d\n", bond->params.resend_igmp);
1272 }
1273
1274 static ssize_t bonding_store_resend_igmp(struct device *d,
1275                                          struct device_attribute *attr,
1276                                          const char *buf, size_t count)
1277 {
1278         int new_value, ret = count;
1279         struct bonding *bond = to_bond(d);
1280
1281         if (sscanf(buf, "%d", &new_value) != 1) {
1282                 pr_err("%s: no resend_igmp value specified.\n",
1283                        bond->dev->name);
1284                 return -EINVAL;
1285         }
1286
1287         if (!rtnl_trylock())
1288                 return restart_syscall();
1289
1290         ret = bond_option_resend_igmp_set(bond, new_value);
1291         if (!ret)
1292                 ret = count;
1293
1294         rtnl_unlock();
1295         return ret;
1296 }
1297
1298 static DEVICE_ATTR(resend_igmp, S_IRUGO | S_IWUSR,
1299                    bonding_show_resend_igmp, bonding_store_resend_igmp);
1300
1301
1302 static ssize_t bonding_show_lp_interval(struct device *d,
1303                                         struct device_attribute *attr,
1304                                         char *buf)
1305 {
1306         struct bonding *bond = to_bond(d);
1307         return sprintf(buf, "%d\n", bond->params.lp_interval);
1308 }
1309
1310 static ssize_t bonding_store_lp_interval(struct device *d,
1311                                          struct device_attribute *attr,
1312                                          const char *buf, size_t count)
1313 {
1314         struct bonding *bond = to_bond(d);
1315         int new_value, ret;
1316
1317         if (sscanf(buf, "%d", &new_value) != 1) {
1318                 pr_err("%s: no lp interval value specified.\n",
1319                         bond->dev->name);
1320                 return -EINVAL;
1321         }
1322
1323         if (!rtnl_trylock())
1324                 return restart_syscall();
1325
1326         ret = bond_option_lp_interval_set(bond, new_value);
1327         if (!ret)
1328                 ret = count;
1329
1330         rtnl_unlock();
1331         return ret;
1332 }
1333
1334 static DEVICE_ATTR(lp_interval, S_IRUGO | S_IWUSR,
1335                    bonding_show_lp_interval, bonding_store_lp_interval);
1336
1337 static ssize_t bonding_show_packets_per_slave(struct device *d,
1338                                               struct device_attribute *attr,
1339                                               char *buf)
1340 {
1341         struct bonding *bond = to_bond(d);
1342         unsigned int packets_per_slave = bond->params.packets_per_slave;
1343         return sprintf(buf, "%u\n", packets_per_slave);
1344 }
1345
1346 static ssize_t bonding_store_packets_per_slave(struct device *d,
1347                                                struct device_attribute *attr,
1348                                                const char *buf, size_t count)
1349 {
1350         struct bonding *bond = to_bond(d);
1351         int ret;
1352
1353         ret = bond_opt_tryset_rtnl(bond, BOND_OPT_PACKETS_PER_SLAVE,
1354                                    (char *)buf);
1355         if (!ret)
1356                 ret = count;
1357
1358         return ret;
1359 }
1360
1361 static DEVICE_ATTR(packets_per_slave, S_IRUGO | S_IWUSR,
1362                    bonding_show_packets_per_slave,
1363                    bonding_store_packets_per_slave);
1364
1365 static struct attribute *per_bond_attrs[] = {
1366         &dev_attr_slaves.attr,
1367         &dev_attr_mode.attr,
1368         &dev_attr_fail_over_mac.attr,
1369         &dev_attr_arp_validate.attr,
1370         &dev_attr_arp_all_targets.attr,
1371         &dev_attr_arp_interval.attr,
1372         &dev_attr_arp_ip_target.attr,
1373         &dev_attr_downdelay.attr,
1374         &dev_attr_updelay.attr,
1375         &dev_attr_lacp_rate.attr,
1376         &dev_attr_ad_select.attr,
1377         &dev_attr_xmit_hash_policy.attr,
1378         &dev_attr_num_grat_arp.attr,
1379         &dev_attr_num_unsol_na.attr,
1380         &dev_attr_miimon.attr,
1381         &dev_attr_primary.attr,
1382         &dev_attr_primary_reselect.attr,
1383         &dev_attr_use_carrier.attr,
1384         &dev_attr_active_slave.attr,
1385         &dev_attr_mii_status.attr,
1386         &dev_attr_ad_aggregator.attr,
1387         &dev_attr_ad_num_ports.attr,
1388         &dev_attr_ad_actor_key.attr,
1389         &dev_attr_ad_partner_key.attr,
1390         &dev_attr_ad_partner_mac.attr,
1391         &dev_attr_queue_id.attr,
1392         &dev_attr_all_slaves_active.attr,
1393         &dev_attr_resend_igmp.attr,
1394         &dev_attr_min_links.attr,
1395         &dev_attr_lp_interval.attr,
1396         &dev_attr_packets_per_slave.attr,
1397         NULL,
1398 };
1399
1400 static struct attribute_group bonding_group = {
1401         .name = "bonding",
1402         .attrs = per_bond_attrs,
1403 };
1404
1405 /*
1406  * Initialize sysfs.  This sets up the bonding_masters file in
1407  * /sys/class/net.
1408  */
1409 int bond_create_sysfs(struct bond_net *bn)
1410 {
1411         int ret;
1412
1413         bn->class_attr_bonding_masters = class_attr_bonding_masters;
1414         sysfs_attr_init(&bn->class_attr_bonding_masters.attr);
1415
1416         ret = netdev_class_create_file_ns(&bn->class_attr_bonding_masters,
1417                                           bn->net);
1418         /*
1419          * Permit multiple loads of the module by ignoring failures to
1420          * create the bonding_masters sysfs file.  Bonding devices
1421          * created by second or subsequent loads of the module will
1422          * not be listed in, or controllable by, bonding_masters, but
1423          * will have the usual "bonding" sysfs directory.
1424          *
1425          * This is done to preserve backwards compatibility for
1426          * initscripts/sysconfig, which load bonding multiple times to
1427          * configure multiple bonding devices.
1428          */
1429         if (ret == -EEXIST) {
1430                 /* Is someone being kinky and naming a device bonding_master? */
1431                 if (__dev_get_by_name(bn->net,
1432                                       class_attr_bonding_masters.attr.name))
1433                         pr_err("network device named %s already exists in sysfs",
1434                                class_attr_bonding_masters.attr.name);
1435                 ret = 0;
1436         }
1437
1438         return ret;
1439
1440 }
1441
1442 /*
1443  * Remove /sys/class/net/bonding_masters.
1444  */
1445 void bond_destroy_sysfs(struct bond_net *bn)
1446 {
1447         netdev_class_remove_file_ns(&bn->class_attr_bonding_masters, bn->net);
1448 }
1449
1450 /*
1451  * Initialize sysfs for each bond.  This sets up and registers
1452  * the 'bondctl' directory for each individual bond under /sys/class/net.
1453  */
1454 void bond_prepare_sysfs_group(struct bonding *bond)
1455 {
1456         bond->dev->sysfs_groups[0] = &bonding_group;
1457 }
1458