Pileus Git - ~andy/linux/blob - drivers/net/bonding/bond_sysfs.c

   1
   2 /*
   3  * Copyright(c) 2004-2005 Intel Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  12  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18  *
  19  * The full GNU General Public License is included in this distribution in the
  20  * file called LICENSE.
  21  *
  22  */
  23 #include <linux/kernel.h>
  24 #include <linux/module.h>
  25 #include <linux/device.h>
  26 #include <linux/sysdev.h>
  27 #include <linux/fs.h>
  28 #include <linux/types.h>
  29 #include <linux/string.h>
  30 #include <linux/netdevice.h>
  31 #include <linux/inetdevice.h>
  32 #include <linux/in.h>
  33 #include <linux/sysfs.h>
  34 #include <linux/ctype.h>
  35 #include <linux/inet.h>
  36 #include <linux/rtnetlink.h>
  37 #include <net/net_namespace.h>
  38
  39 /* #define BONDING_DEBUG 1 */
  40 #include "bonding.h"
  41 #define to_dev(obj)     container_of(obj,struct device,kobj)
  42 #define to_bond(cd)     ((struct bonding *)(to_net_dev(cd)->priv))
  43
  44 /*---------------------------- Declarations -------------------------------*/
  45
  46
  47 extern struct list_head bond_dev_list;
  48 extern struct bond_params bonding_defaults;
  49 extern struct bond_parm_tbl bond_mode_tbl[];
  50 extern struct bond_parm_tbl bond_lacp_tbl[];
  51 extern struct bond_parm_tbl xmit_hashtype_tbl[];
  52 extern struct bond_parm_tbl arp_validate_tbl[];
  53
  54 static int expected_refcount = -1;
  55 static struct class *netdev_class;
  56 /*--------------------------- Data Structures -----------------------------*/
  57
  58 /* Bonding sysfs lock.  Why can't we just use the subsystem lock?
  59  * Because kobject_register tries to acquire the subsystem lock.  If
  60  * we already hold the lock (which we would if the user was creating
  61  * a new bond through the sysfs interface), we deadlock.
  62  * This lock is only needed when deleting a bond - we need to make sure
  63  * that we don't collide with an ongoing ioctl.
  64  */
  65
  66 struct rw_semaphore bonding_rwsem;
  67
  68
  69
  70
  71 /*------------------------------ Functions --------------------------------*/
  72
  73 /*
  74  * "show" function for the bond_masters attribute.
  75  * The class parameter is ignored.
  76  */
  77 static ssize_t bonding_show_bonds(struct class *cls, char *buffer)
  78 {
  79         int res = 0;
  80         struct bonding *bond;
  81
  82         down_read(&(bonding_rwsem));
  83
  84         list_for_each_entry(bond, &bond_dev_list, bond_list) {
  85                 if (res > (PAGE_SIZE - IFNAMSIZ)) {
  86                         /* not enough space for another interface name */
  87                         if ((PAGE_SIZE - res) > 10)
  88                                 res = PAGE_SIZE - 10;
  89                         res += sprintf(buffer + res, "++more++");
  90                         break;
  91                 }
  92                 res += sprintf(buffer + res, "%s ",
  93                                bond->dev->name);
  94         }
  95         res += sprintf(buffer + res, "\n");
  96         res++;
  97         up_read(&(bonding_rwsem));
  98         return res;
  99 }
 100
 101 /*
 102  * "store" function for the bond_masters attribute.  This is what
 103  * creates and deletes entire bonds.
 104  *
 105  * The class parameter is ignored.
 106  *
 107  */
 108
 109 static ssize_t bonding_store_bonds(struct class *cls, const char *buffer, size_t count)
 110 {
 111         char command[IFNAMSIZ + 1] = {0, };
 112         char *ifname;
 113         int res = count;
 114         struct bonding *bond;
 115         struct bonding *nxt;
 116
 117         down_write(&(bonding_rwsem));
 118         sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
 119         ifname = command + 1;
 120         if ((strlen(command) <= 1) ||
 121             !dev_valid_name(ifname))
 122                 goto err_no_cmd;
 123
 124         if (command[0] == '+') {
 125
 126                 /* Check to see if the bond already exists. */
 127                 list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list)
 128                         if (strnicmp(bond->dev->name, ifname, IFNAMSIZ) == 0) {
 129                                 printk(KERN_ERR DRV_NAME
 130                                         ": cannot add bond %s; it already exists\n",
 131                                         ifname);
 132                                 res = -EPERM;
 133                                 goto out;
 134                         }
 135
 136                 printk(KERN_INFO DRV_NAME
 137                         ": %s is being created...\n", ifname);
 138                 if (bond_create(ifname, &bonding_defaults, &bond)) {
 139                         printk(KERN_INFO DRV_NAME
 140                         ": %s interface already exists. Bond creation failed.\n",
 141                         ifname);
 142                         res = -EPERM;
 143                 }
 144                 goto out;
 145         }
 146
 147         if (command[0] == '-') {
 148                 list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list)
 149                         if (strnicmp(bond->dev->name, ifname, IFNAMSIZ) == 0) {
 150                                 rtnl_lock();
 151                                 /* check the ref count on the bond's kobject.
 152                                  * If it's > expected, then there's a file open,
 153                                  * and we have to fail.
 154                                  */
 155                                 if (atomic_read(&bond->dev->dev.kobj.kref.refcount)
 156                                                         > expected_refcount){
 157                                         rtnl_unlock();
 158                                         printk(KERN_INFO DRV_NAME
 159                                                 ": Unable remove bond %s due to open references.\n",
 160                                                 ifname);
 161                                         res = -EPERM;
 162                                         goto out;
 163                                 }
 164                                 printk(KERN_INFO DRV_NAME
 165                                         ": %s is being deleted...\n",
 166                                         bond->dev->name);
 167                                 bond_destroy(bond);
 168                                 rtnl_unlock();
 169                                 goto out;
 170                         }
 171
 172                 printk(KERN_ERR DRV_NAME
 173                         ": unable to delete non-existent bond %s\n", ifname);
 174                 res = -ENODEV;
 175                 goto out;
 176         }
 177
 178 err_no_cmd:
 179         printk(KERN_ERR DRV_NAME
 180                 ": no command found in bonding_masters. Use +ifname or -ifname.\n");
 181         res = -EPERM;
 182
 183         /* Always return either count or an error.  If you return 0, you'll
 184          * get called forever, which is bad.
 185          */
 186 out:
 187         up_write(&(bonding_rwsem));
 188         return res;
 189 }
 190 /* class attribute for bond_masters file.  This ends up in /sys/class/net */
 191 static CLASS_ATTR(bonding_masters,  S_IWUSR | S_IRUGO,
 192                   bonding_show_bonds, bonding_store_bonds);
 193
 194 int bond_create_slave_symlinks(struct net_device *master, struct net_device *slave)
 195 {
 196         char linkname[IFNAMSIZ+7];
 197         int ret = 0;
 198
 199         /* first, create a link from the slave back to the master */
 200         ret = sysfs_create_link(&(slave->dev.kobj), &(master->dev.kobj),
 201                                 "master");
 202         if (ret)
 203                 return ret;
 204         /* next, create a link from the master to the slave */
 205         sprintf(linkname,"slave_%s",slave->name);
 206         ret = sysfs_create_link(&(master->dev.kobj), &(slave->dev.kobj),
 207                                 linkname);
 208         return ret;
 209
 210 }
 211
 212 void bond_destroy_slave_symlinks(struct net_device *master, struct net_device *slave)
 213 {
 214         char linkname[IFNAMSIZ+7];
 215
 216         sysfs_remove_link(&(slave->dev.kobj), "master");
 217         sprintf(linkname,"slave_%s",slave->name);
 218         sysfs_remove_link(&(master->dev.kobj), linkname);
 219 }
 220
 221
 222 /*
 223  * Show the slaves in the current bond.
 224  */
 225 static ssize_t bonding_show_slaves(struct device *d,
 226                                    struct device_attribute *attr, char *buf)
 227 {
 228         struct slave *slave;
 229         int i, res = 0;
 230         struct bonding *bond = to_bond(d);
 231
 232         read_lock(&bond->lock);
 233         bond_for_each_slave(bond, slave, i) {
 234                 if (res > (PAGE_SIZE - IFNAMSIZ)) {
 235                         /* not enough space for another interface name */
 236                         if ((PAGE_SIZE - res) > 10)
 237                                 res = PAGE_SIZE - 10;
 238                         res += sprintf(buf + res, "++more++");
 239                         break;
 240                 }
 241                 res += sprintf(buf + res, "%s ", slave->dev->name);
 242         }
 243         read_unlock(&bond->lock);
 244         res += sprintf(buf + res, "\n");
 245         res++;
 246         return res;
 247 }
 248
 249 /*
 250  * Set the slaves in the current bond.  The bond interface must be
 251  * up for this to succeed.
 252  * This function is largely the same flow as bonding_update_bonds().
 253  */
 254 static ssize_t bonding_store_slaves(struct device *d,
 255                                     struct device_attribute *attr,
 256                                     const char *buffer, size_t count)
 257 {
 258         char command[IFNAMSIZ + 1] = { 0, };
 259         char *ifname;
 260         int i, res, found, ret = count;
 261         u32 original_mtu;
 262         struct slave *slave;
 263         struct net_device *dev = NULL;
 264         struct bonding *bond = to_bond(d);
 265
 266         /* Quick sanity check -- is the bond interface up? */
 267         if (!(bond->dev->flags & IFF_UP)) {
 268                 printk(KERN_WARNING DRV_NAME
 269                        ": %s: doing slave updates when interface is down.\n",
 270                        bond->dev->name);
 271         }
 272
 273         /* Note:  We can't hold bond->lock here, as bond_create grabs it. */
 274
 275         sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
 276         ifname = command + 1;
 277         if ((strlen(command) <= 1) ||
 278             !dev_valid_name(ifname))
 279                 goto err_no_cmd;
 280
 281         if (command[0] == '+') {
 282
 283                 /* Got a slave name in ifname.  Is it already in the list? */
 284                 found = 0;
 285                 read_lock(&bond->lock);
 286                 bond_for_each_slave(bond, slave, i)
 287                         if (strnicmp(slave->dev->name, ifname, IFNAMSIZ) == 0) {
 288                                 printk(KERN_ERR DRV_NAME
 289                                        ": %s: Interface %s is already enslaved!\n",
 290                                        bond->dev->name, ifname);
 291                                 ret = -EPERM;
 292                                 read_unlock(&bond->lock);
 293                                 goto out;
 294                         }
 295
 296                 read_unlock(&bond->lock);
 297                 printk(KERN_INFO DRV_NAME ": %s: Adding slave %s.\n",
 298                        bond->dev->name, ifname);
 299                 dev = dev_get_by_name(&init_net, ifname);
 300                 if (!dev) {
 301                         printk(KERN_INFO DRV_NAME
 302                                ": %s: Interface %s does not exist!\n",
 303                                bond->dev->name, ifname);
 304                         ret = -EPERM;
 305                         goto out;
 306                 }
 307                 else
 308                         dev_put(dev);
 309
 310                 if (dev->flags & IFF_UP) {
 311                         printk(KERN_ERR DRV_NAME
 312                                ": %s: Error: Unable to enslave %s "
 313                                "because it is already up.\n",
 314                                bond->dev->name, dev->name);
 315                         ret = -EPERM;
 316                         goto out;
 317                 }
 318                 /* If this is the first slave, then we need to set
 319                    the master's hardware address to be the same as the
 320                    slave's. */
 321                 if (!(*((u32 *) & (bond->dev->dev_addr[0])))) {
 322                         memcpy(bond->dev->dev_addr, dev->dev_addr,
 323                                dev->addr_len);
 324                 }
 325
 326                 /* Set the slave's MTU to match the bond */
 327                 original_mtu = dev->mtu;
 328                 if (dev->mtu != bond->dev->mtu) {
 329                         if (dev->change_mtu) {
 330                                 res = dev->change_mtu(dev,
 331                                                       bond->dev->mtu);
 332                                 if (res) {
 333                                         ret = res;
 334                                         goto out;
 335                                 }
 336                         } else {
 337                                 dev->mtu = bond->dev->mtu;
 338                         }
 339                 }
 340                 rtnl_lock();
 341                 res = bond_enslave(bond->dev, dev);
 342                 bond_for_each_slave(bond, slave, i)
 343                         if (strnicmp(slave->dev->name, ifname, IFNAMSIZ) == 0)
 344                                 slave->original_mtu = original_mtu;
 345                 rtnl_unlock();
 346                 if (res) {
 347                         ret = res;
 348                 }
 349                 goto out;
 350         }
 351
 352         if (command[0] == '-') {
 353                 dev = NULL;
 354                 bond_for_each_slave(bond, slave, i)
 355                         if (strnicmp(slave->dev->name, ifname, IFNAMSIZ) == 0) {
 356                                 dev = slave->dev;
 357                                 original_mtu = slave->original_mtu;
 358                                 break;
 359                         }
 360                 if (dev) {
 361                         printk(KERN_INFO DRV_NAME ": %s: Removing slave %s\n",
 362                                 bond->dev->name, dev->name);
 363                         rtnl_lock();
 364                         if (bond->setup_by_slave)
 365                                 res = bond_release_and_destroy(bond->dev, dev);
 366                         else
 367                                 res = bond_release(bond->dev, dev);
 368                         rtnl_unlock();
 369                         if (res) {
 370                                 ret = res;
 371                                 goto out;
 372                         }
 373                         /* set the slave MTU to the default */
 374                         if (dev->change_mtu) {
 375                                 dev->change_mtu(dev, original_mtu);
 376                         } else {
 377                                 dev->mtu = original_mtu;
 378                         }
 379                 }
 380                 else {
 381                         printk(KERN_ERR DRV_NAME ": unable to remove non-existent slave %s for bond %s.\n",
 382                                 ifname, bond->dev->name);
 383                         ret = -ENODEV;
 384                 }
 385                 goto out;
 386         }
 387
 388 err_no_cmd:
 389         printk(KERN_ERR DRV_NAME ": no command found in slaves file for bond %s. Use +ifname or -ifname.\n", bond->dev->name);
 390         ret = -EPERM;
 391
 392 out:
 393         return ret;
 394 }
 395
 396 static DEVICE_ATTR(slaves, S_IRUGO | S_IWUSR, bonding_show_slaves, bonding_store_slaves);
 397
 398 /*
 399  * Show and set the bonding mode.  The bond interface must be down to
 400  * change the mode.
 401  */
 402 static ssize_t bonding_show_mode(struct device *d,
 403                                  struct device_attribute *attr, char *buf)
 404 {
 405         struct bonding *bond = to_bond(d);
 406
 407         return sprintf(buf, "%s %d\n",
 408                         bond_mode_tbl[bond->params.mode].modename,
 409                         bond->params.mode) + 1;
 410 }
 411
 412 static ssize_t bonding_store_mode(struct device *d,
 413                                   struct device_attribute *attr,
 414                                   const char *buf, size_t count)
 415 {
 416         int new_value, ret = count;
 417         struct bonding *bond = to_bond(d);
 418
 419         if (bond->dev->flags & IFF_UP) {
 420                 printk(KERN_ERR DRV_NAME
 421                        ": unable to update mode of %s because interface is up.\n",
 422                        bond->dev->name);
 423                 ret = -EPERM;
 424                 goto out;
 425         }
 426
 427         new_value = bond_parse_parm((char *)buf, bond_mode_tbl);
 428         if (new_value < 0)  {
 429                 printk(KERN_ERR DRV_NAME
 430                        ": %s: Ignoring invalid mode value %.*s.\n",
 431                        bond->dev->name,
 432                        (int)strlen(buf) - 1, buf);
 433                 ret = -EINVAL;
 434                 goto out;
 435         } else {
 436                 if (bond->params.mode == BOND_MODE_8023AD)
 437                         bond_unset_master_3ad_flags(bond);
 438
 439                 if (bond->params.mode == BOND_MODE_ALB)
 440                         bond_unset_master_alb_flags(bond);
 441
 442                 bond->params.mode = new_value;
 443                 bond_set_mode_ops(bond, bond->params.mode);
 444                 printk(KERN_INFO DRV_NAME ": %s: setting mode to %s (%d).\n",
 445                         bond->dev->name, bond_mode_tbl[new_value].modename, new_value);
 446         }
 447 out:
 448         return ret;
 449 }
 450 static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR, bonding_show_mode, bonding_store_mode);
 451
 452 /*
 453  * Show and set the bonding transmit hash method.  The bond interface must be down to
 454  * change the xmit hash policy.
 455  */
 456 static ssize_t bonding_show_xmit_hash(struct device *d,
 457                                       struct device_attribute *attr,
 458                                       char *buf)
 459 {
 460         int count;
 461         struct bonding *bond = to_bond(d);
 462
 463         if ((bond->params.mode != BOND_MODE_XOR) &&
 464             (bond->params.mode != BOND_MODE_8023AD)) {
 465                 // Not Applicable
 466                 count = sprintf(buf, "NA\n") + 1;
 467         } else {
 468                 count = sprintf(buf, "%s %d\n",
 469                         xmit_hashtype_tbl[bond->params.xmit_policy].modename,
 470                         bond->params.xmit_policy) + 1;
 471         }
 472
 473         return count;
 474 }
 475
 476 static ssize_t bonding_store_xmit_hash(struct device *d,
 477                                        struct device_attribute *attr,
 478                                        const char *buf, size_t count)
 479 {
 480         int new_value, ret = count;
 481         struct bonding *bond = to_bond(d);
 482
 483         if (bond->dev->flags & IFF_UP) {
 484                 printk(KERN_ERR DRV_NAME
 485                        "%s: Interface is up. Unable to update xmit policy.\n",
 486                        bond->dev->name);
 487                 ret = -EPERM;
 488                 goto out;
 489         }
 490
 491         if ((bond->params.mode != BOND_MODE_XOR) &&
 492             (bond->params.mode != BOND_MODE_8023AD)) {
 493                 printk(KERN_ERR DRV_NAME
 494                        "%s: Transmit hash policy is irrelevant in this mode.\n",
 495                        bond->dev->name);
 496                 ret = -EPERM;
 497                 goto out;
 498         }
 499
 500         new_value = bond_parse_parm((char *)buf, xmit_hashtype_tbl);
 501         if (new_value < 0)  {
 502                 printk(KERN_ERR DRV_NAME
 503                        ": %s: Ignoring invalid xmit hash policy value %.*s.\n",
 504                        bond->dev->name,
 505                        (int)strlen(buf) - 1, buf);
 506                 ret = -EINVAL;
 507                 goto out;
 508         } else {
 509                 bond->params.xmit_policy = new_value;
 510                 bond_set_mode_ops(bond, bond->params.mode);
 511                 printk(KERN_INFO DRV_NAME ": %s: setting xmit hash policy to %s (%d).\n",
 512                         bond->dev->name, xmit_hashtype_tbl[new_value].modename, new_value);
 513         }
 514 out:
 515         return ret;
 516 }
 517 static DEVICE_ATTR(xmit_hash_policy, S_IRUGO | S_IWUSR, bonding_show_xmit_hash, bonding_store_xmit_hash);
 518
 519 /*
 520  * Show and set arp_validate.
 521  */
 522 static ssize_t bonding_show_arp_validate(struct device *d,
 523                                          struct device_attribute *attr,
 524                                          char *buf)
 525 {
 526         struct bonding *bond = to_bond(d);
 527
 528         return sprintf(buf, "%s %d\n",
 529                        arp_validate_tbl[bond->params.arp_validate].modename,
 530                        bond->params.arp_validate) + 1;
 531 }
 532
 533 static ssize_t bonding_store_arp_validate(struct device *d,
 534                                           struct device_attribute *attr,
 535                                           const char *buf, size_t count)
 536 {
 537         int new_value;
 538         struct bonding *bond = to_bond(d);
 539
 540         new_value = bond_parse_parm((char *)buf, arp_validate_tbl);
 541         if (new_value < 0) {
 542                 printk(KERN_ERR DRV_NAME
 543                        ": %s: Ignoring invalid arp_validate value %s\n",
 544                        bond->dev->name, buf);
 545                 return -EINVAL;
 546         }
 547         if (new_value && (bond->params.mode != BOND_MODE_ACTIVEBACKUP)) {
 548                 printk(KERN_ERR DRV_NAME
 549                        ": %s: arp_validate only supported in active-backup mode.\n",
 550                        bond->dev->name);
 551                 return -EINVAL;
 552         }
 553         printk(KERN_INFO DRV_NAME ": %s: setting arp_validate to %s (%d).\n",
 554                bond->dev->name, arp_validate_tbl[new_value].modename,
 555                new_value);
 556
 557         if (!bond->params.arp_validate && new_value) {
 558                 bond_register_arp(bond);
 559         } else if (bond->params.arp_validate && !new_value) {
 560                 bond_unregister_arp(bond);
 561         }
 562
 563         bond->params.arp_validate = new_value;
 564
 565         return count;
 566 }
 567
 568 static DEVICE_ATTR(arp_validate, S_IRUGO | S_IWUSR, bonding_show_arp_validate, bonding_store_arp_validate);
 569
 570 /*
 571  * Show and store fail_over_mac.  User only allowed to change the
 572  * value when there are no slaves.
 573  */
 574 static ssize_t bonding_show_fail_over_mac(struct device *d, struct device_attribute *attr, char *buf)
 575 {
 576         struct bonding *bond = to_bond(d);
 577
 578         return sprintf(buf, "%d\n", bond->params.fail_over_mac) + 1;
 579 }
 580
 581 static ssize_t bonding_store_fail_over_mac(struct device *d, struct device_attribute *attr, const char *buf, size_t count)
 582 {
 583         int new_value;
 584         int ret = count;
 585         struct bonding *bond = to_bond(d);
 586
 587         if (bond->slave_cnt != 0) {
 588                 printk(KERN_ERR DRV_NAME
 589                        ": %s: Can't alter fail_over_mac with slaves in bond.\n",
 590                        bond->dev->name);
 591                 ret = -EPERM;
 592                 goto out;
 593         }
 594
 595         if (sscanf(buf, "%d", &new_value) != 1) {
 596                 printk(KERN_ERR DRV_NAME
 597                        ": %s: no fail_over_mac value specified.\n",
 598                        bond->dev->name);
 599                 ret = -EINVAL;
 600                 goto out;
 601         }
 602
 603         if ((new_value == 0) || (new_value == 1)) {
 604                 bond->params.fail_over_mac = new_value;
 605                 printk(KERN_INFO DRV_NAME ": %s: Setting fail_over_mac to %d.\n",
 606                        bond->dev->name, new_value);
 607         } else {
 608                 printk(KERN_INFO DRV_NAME
 609                        ": %s: Ignoring invalid fail_over_mac value %d.\n",
 610                        bond->dev->name, new_value);
 611         }
 612 out:
 613         return ret;
 614 }
 615
 616 static DEVICE_ATTR(fail_over_mac, S_IRUGO | S_IWUSR, bonding_show_fail_over_mac, bonding_store_fail_over_mac);
 617
 618 /*
 619  * Show and set the arp timer interval.  There are two tricky bits
 620  * here.  First, if ARP monitoring is activated, then we must disable
 621  * MII monitoring.  Second, if the ARP timer isn't running, we must
 622  * start it.
 623  */
 624 static ssize_t bonding_show_arp_interval(struct device *d,
 625                                          struct device_attribute *attr,
 626                                          char *buf)
 627 {
 628         struct bonding *bond = to_bond(d);
 629
 630         return sprintf(buf, "%d\n", bond->params.arp_interval) + 1;
 631 }
 632
 633 static ssize_t bonding_store_arp_interval(struct device *d,
 634                                           struct device_attribute *attr,
 635                                           const char *buf, size_t count)
 636 {
 637         int new_value, ret = count;
 638         struct bonding *bond = to_bond(d);
 639
 640         if (sscanf(buf, "%d", &new_value) != 1) {
 641                 printk(KERN_ERR DRV_NAME
 642                        ": %s: no arp_interval value specified.\n",
 643                        bond->dev->name);
 644                 ret = -EINVAL;
 645                 goto out;
 646         }
 647         if (new_value < 0) {
 648                 printk(KERN_ERR DRV_NAME
 649                        ": %s: Invalid arp_interval value %d not in range 1-%d; rejected.\n",
 650                        bond->dev->name, new_value, INT_MAX);
 651                 ret = -EINVAL;
 652                 goto out;
 653         }
 654
 655         printk(KERN_INFO DRV_NAME
 656                ": %s: Setting ARP monitoring interval to %d.\n",
 657                bond->dev->name, new_value);
 658         bond->params.arp_interval = new_value;
 659         if (bond->params.miimon) {
 660                 printk(KERN_INFO DRV_NAME
 661                        ": %s: ARP monitoring cannot be used with MII monitoring. "
 662                        "%s Disabling MII monitoring.\n",
 663                        bond->dev->name, bond->dev->name);
 664                 bond->params.miimon = 0;
 665                 if (delayed_work_pending(&bond->mii_work)) {
 666                         cancel_delayed_work(&bond->mii_work);
 667                         flush_workqueue(bond->wq);
 668                 }
 669         }
 670         if (!bond->params.arp_targets[0]) {
 671                 printk(KERN_INFO DRV_NAME
 672                        ": %s: ARP monitoring has been set up, "
 673                        "but no ARP targets have been specified.\n",
 674                        bond->dev->name);
 675         }
 676         if (bond->dev->flags & IFF_UP) {
 677                 /* If the interface is up, we may need to fire off
 678                  * the ARP timer.  If the interface is down, the
 679                  * timer will get fired off when the open function
 680                  * is called.
 681                  */
 682                 if (!delayed_work_pending(&bond->arp_work)) {
 683                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
 684                                 INIT_DELAYED_WORK(&bond->arp_work,
 685                                                   bond_activebackup_arp_mon);
 686                         else
 687                                 INIT_DELAYED_WORK(&bond->arp_work,
 688                                                   bond_loadbalance_arp_mon);
 689
 690                         queue_delayed_work(bond->wq, &bond->arp_work, 0);
 691                 }
 692         }
 693
 694 out:
 695         return ret;
 696 }
 697 static DEVICE_ATTR(arp_interval, S_IRUGO | S_IWUSR , bonding_show_arp_interval, bonding_store_arp_interval);
 698
 699 /*
 700  * Show and set the arp targets.
 701  */
 702 static ssize_t bonding_show_arp_targets(struct device *d,
 703                                         struct device_attribute *attr,
 704                                         char *buf)
 705 {
 706         int i, res = 0;
 707         struct bonding *bond = to_bond(d);
 708
 709         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) {
 710                 if (bond->params.arp_targets[i])
 711                         res += sprintf(buf + res, "%u.%u.%u.%u ",
 712                                NIPQUAD(bond->params.arp_targets[i]));
 713         }
 714         if (res)
 715                 res--;  /* eat the leftover space */
 716         res += sprintf(buf + res, "\n");
 717         res++;
 718         return res;
 719 }
 720
 721 static ssize_t bonding_store_arp_targets(struct device *d,
 722                                          struct device_attribute *attr,
 723                                          const char *buf, size_t count)
 724 {
 725         __be32 newtarget;
 726         int i = 0, done = 0, ret = count;
 727         struct bonding *bond = to_bond(d);
 728         __be32 *targets;
 729
 730         targets = bond->params.arp_targets;
 731         newtarget = in_aton(buf + 1);
 732         /* look for adds */
 733         if (buf[0] == '+') {
 734                 if ((newtarget == 0) || (newtarget == htonl(INADDR_BROADCAST))) {
 735                         printk(KERN_ERR DRV_NAME
 736                                ": %s: invalid ARP target %u.%u.%u.%u specified for addition\n",
 737                                bond->dev->name, NIPQUAD(newtarget));
 738                         ret = -EINVAL;
 739                         goto out;
 740                 }
 741                 /* look for an empty slot to put the target in, and check for dupes */
 742                 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
 743                         if (targets[i] == newtarget) { /* duplicate */
 744                                 printk(KERN_ERR DRV_NAME
 745                                        ": %s: ARP target %u.%u.%u.%u is already present\n",
 746                                        bond->dev->name, NIPQUAD(newtarget));
 747                                 if (done)
 748                                         targets[i] = 0;
 749                                 ret = -EINVAL;
 750                                 goto out;
 751                         }
 752                         if (targets[i] == 0 && !done) {
 753                                 printk(KERN_INFO DRV_NAME
 754                                        ": %s: adding ARP target %d.%d.%d.%d.\n",
 755                                        bond->dev->name, NIPQUAD(newtarget));
 756                                 done = 1;
 757                                 targets[i] = newtarget;
 758                         }
 759                 }
 760                 if (!done) {
 761                         printk(KERN_ERR DRV_NAME
 762                                ": %s: ARP target table is full!\n",
 763                                bond->dev->name);
 764                         ret = -EINVAL;
 765                         goto out;
 766                 }
 767
 768         }
 769         else if (buf[0] == '-') {
 770                 if ((newtarget == 0) || (newtarget == htonl(INADDR_BROADCAST))) {
 771                         printk(KERN_ERR DRV_NAME
 772                                ": %s: invalid ARP target %d.%d.%d.%d specified for removal\n",
 773                                bond->dev->name, NIPQUAD(newtarget));
 774                         ret = -EINVAL;
 775                         goto out;
 776                 }
 777
 778                 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
 779                         if (targets[i] == newtarget) {
 780                                 printk(KERN_INFO DRV_NAME
 781                                        ": %s: removing ARP target %d.%d.%d.%d.\n",
 782                                        bond->dev->name, NIPQUAD(newtarget));
 783                                 targets[i] = 0;
 784                                 done = 1;
 785                         }
 786                 }
 787                 if (!done) {
 788                         printk(KERN_INFO DRV_NAME
 789                                ": %s: unable to remove nonexistent ARP target %d.%d.%d.%d.\n",
 790                                bond->dev->name, NIPQUAD(newtarget));
 791                         ret = -EINVAL;
 792                         goto out;
 793                 }
 794         }
 795         else {
 796                 printk(KERN_ERR DRV_NAME ": no command found in arp_ip_targets file for bond %s. Use +<addr> or -<addr>.\n",
 797                         bond->dev->name);
 798                 ret = -EPERM;
 799                 goto out;
 800         }
 801
 802 out:
 803         return ret;
 804 }
 805 static DEVICE_ATTR(arp_ip_target, S_IRUGO | S_IWUSR , bonding_show_arp_targets, bonding_store_arp_targets);
 806
 807 /*
 808  * Show and set the up and down delays.  These must be multiples of the
 809  * MII monitoring value, and are stored internally as the multiplier.
 810  * Thus, we must translate to MS for the real world.
 811  */
 812 static ssize_t bonding_show_downdelay(struct device *d,
 813                                       struct device_attribute *attr,
 814                                       char *buf)
 815 {
 816         struct bonding *bond = to_bond(d);
 817
 818         return sprintf(buf, "%d\n", bond->params.downdelay * bond->params.miimon) + 1;
 819 }
 820
 821 static ssize_t bonding_store_downdelay(struct device *d,
 822                                        struct device_attribute *attr,
 823                                        const char *buf, size_t count)
 824 {
 825         int new_value, ret = count;
 826         struct bonding *bond = to_bond(d);
 827
 828         if (!(bond->params.miimon)) {
 829                 printk(KERN_ERR DRV_NAME
 830                        ": %s: Unable to set down delay as MII monitoring is disabled\n",
 831                        bond->dev->name);
 832                 ret = -EPERM;
 833                 goto out;
 834         }
 835
 836         if (sscanf(buf, "%d", &new_value) != 1) {
 837                 printk(KERN_ERR DRV_NAME
 838                        ": %s: no down delay value specified.\n",
 839                        bond->dev->name);
 840                 ret = -EINVAL;
 841                 goto out;
 842         }
 843         if (new_value < 0) {
 844                 printk(KERN_ERR DRV_NAME
 845                        ": %s: Invalid down delay value %d not in range %d-%d; rejected.\n",
 846                        bond->dev->name, new_value, 1, INT_MAX);
 847                 ret = -EINVAL;
 848                 goto out;
 849         } else {
 850                 if ((new_value % bond->params.miimon) != 0) {
 851                         printk(KERN_WARNING DRV_NAME
 852                                ": %s: Warning: down delay (%d) is not a multiple "
 853                                "of miimon (%d), delay rounded to %d ms\n",
 854                                bond->dev->name, new_value, bond->params.miimon,
 855                                (new_value / bond->params.miimon) *
 856                                bond->params.miimon);
 857                 }
 858                 bond->params.downdelay = new_value / bond->params.miimon;
 859                 printk(KERN_INFO DRV_NAME ": %s: Setting down delay to %d.\n",
 860                        bond->dev->name, bond->params.downdelay * bond->params.miimon);
 861
 862         }
 863
 864 out:
 865         return ret;
 866 }
 867 static DEVICE_ATTR(downdelay, S_IRUGO | S_IWUSR , bonding_show_downdelay, bonding_store_downdelay);
 868
 869 static ssize_t bonding_show_updelay(struct device *d,
 870                                     struct device_attribute *attr,
 871                                     char *buf)
 872 {
 873         struct bonding *bond = to_bond(d);
 874
 875         return sprintf(buf, "%d\n", bond->params.updelay * bond->params.miimon) + 1;
 876
 877 }
 878
 879 static ssize_t bonding_store_updelay(struct device *d,
 880                                      struct device_attribute *attr,
 881                                      const char *buf, size_t count)
 882 {
 883         int new_value, ret = count;
 884         struct bonding *bond = to_bond(d);
 885
 886         if (!(bond->params.miimon)) {
 887                 printk(KERN_ERR DRV_NAME
 888                        ": %s: Unable to set up delay as MII monitoring is disabled\n",
 889                        bond->dev->name);
 890                 ret = -EPERM;
 891                 goto out;
 892         }
 893
 894         if (sscanf(buf, "%d", &new_value) != 1) {
 895                 printk(KERN_ERR DRV_NAME
 896                        ": %s: no up delay value specified.\n",
 897                        bond->dev->name);
 898                 ret = -EINVAL;
 899                 goto out;
 900         }
 901         if (new_value < 0) {
 902                 printk(KERN_ERR DRV_NAME
 903                        ": %s: Invalid down delay value %d not in range %d-%d; rejected.\n",
 904                        bond->dev->name, new_value, 1, INT_MAX);
 905                 ret = -EINVAL;
 906                 goto out;
 907         } else {
 908                 if ((new_value % bond->params.miimon) != 0) {
 909                         printk(KERN_WARNING DRV_NAME
 910                                ": %s: Warning: up delay (%d) is not a multiple "
 911                                "of miimon (%d), updelay rounded to %d ms\n",
 912                                bond->dev->name, new_value, bond->params.miimon,
 913                                (new_value / bond->params.miimon) *
 914                                bond->params.miimon);
 915                 }
 916                 bond->params.updelay = new_value / bond->params.miimon;
 917                 printk(KERN_INFO DRV_NAME ": %s: Setting up delay to %d.\n",
 918                        bond->dev->name, bond->params.updelay * bond->params.miimon);
 919
 920         }
 921
 922 out:
 923         return ret;
 924 }
 925 static DEVICE_ATTR(updelay, S_IRUGO | S_IWUSR , bonding_show_updelay, bonding_store_updelay);
 926
 927 /*
 928  * Show and set the LACP interval.  Interface must be down, and the mode
 929  * must be set to 802.3ad mode.
 930  */
 931 static ssize_t bonding_show_lacp(struct device *d,
 932                                  struct device_attribute *attr,
 933                                  char *buf)
 934 {
 935         struct bonding *bond = to_bond(d);
 936
 937         return sprintf(buf, "%s %d\n",
 938                 bond_lacp_tbl[bond->params.lacp_fast].modename,
 939                 bond->params.lacp_fast) + 1;
 940 }
 941
 942 static ssize_t bonding_store_lacp(struct device *d,
 943                                   struct device_attribute *attr,
 944                                   const char *buf, size_t count)
 945 {
 946         int new_value, ret = count;
 947         struct bonding *bond = to_bond(d);
 948
 949         if (bond->dev->flags & IFF_UP) {
 950                 printk(KERN_ERR DRV_NAME
 951                        ": %s: Unable to update LACP rate because interface is up.\n",
 952                        bond->dev->name);
 953                 ret = -EPERM;
 954                 goto out;
 955         }
 956
 957         if (bond->params.mode != BOND_MODE_8023AD) {
 958                 printk(KERN_ERR DRV_NAME
 959                        ": %s: Unable to update LACP rate because bond is not in 802.3ad mode.\n",
 960                        bond->dev->name);
 961                 ret = -EPERM;
 962                 goto out;
 963         }
 964
 965         new_value = bond_parse_parm((char *)buf, bond_lacp_tbl);
 966
 967         if ((new_value == 1) || (new_value == 0)) {
 968                 bond->params.lacp_fast = new_value;
 969                 printk(KERN_INFO DRV_NAME
 970                        ": %s: Setting LACP rate to %s (%d).\n",
 971                        bond->dev->name, bond_lacp_tbl[new_value].modename, new_value);
 972         } else {
 973                 printk(KERN_ERR DRV_NAME
 974                        ": %s: Ignoring invalid LACP rate value %.*s.\n",
 975                         bond->dev->name, (int)strlen(buf) - 1, buf);
 976                 ret = -EINVAL;
 977         }
 978 out:
 979         return ret;
 980 }
 981 static DEVICE_ATTR(lacp_rate, S_IRUGO | S_IWUSR, bonding_show_lacp, bonding_store_lacp);
 982
 983 /*
 984  * Show and set the MII monitor interval.  There are two tricky bits
 985  * here.  First, if MII monitoring is activated, then we must disable
 986  * ARP monitoring.  Second, if the timer isn't running, we must
 987  * start it.
 988  */
 989 static ssize_t bonding_show_miimon(struct device *d,
 990                                    struct device_attribute *attr,
 991                                    char *buf)
 992 {
 993         struct bonding *bond = to_bond(d);
 994
 995         return sprintf(buf, "%d\n", bond->params.miimon) + 1;
 996 }
 997
 998 static ssize_t bonding_store_miimon(struct device *d,
 999                                     struct device_attribute *attr,
1000                                     const char *buf, size_t count)
1001 {
1002         int new_value, ret = count;
1003         struct bonding *bond = to_bond(d);
1004
1005         if (sscanf(buf, "%d", &new_value) != 1) {
1006                 printk(KERN_ERR DRV_NAME
1007                        ": %s: no miimon value specified.\n",
1008                        bond->dev->name);
1009                 ret = -EINVAL;
1010                 goto out;
1011         }
1012         if (new_value < 0) {
1013                 printk(KERN_ERR DRV_NAME
1014                        ": %s: Invalid miimon value %d not in range %d-%d; rejected.\n",
1015                        bond->dev->name, new_value, 1, INT_MAX);
1016                 ret = -EINVAL;
1017                 goto out;
1018         } else {
1019                 printk(KERN_INFO DRV_NAME
1020                        ": %s: Setting MII monitoring interval to %d.\n",
1021                        bond->dev->name, new_value);
1022                 bond->params.miimon = new_value;
1023                 if(bond->params.updelay)
1024                         printk(KERN_INFO DRV_NAME
1025                               ": %s: Note: Updating updelay (to %d) "
1026                               "since it is a multiple of the miimon value.\n",
1027                               bond->dev->name,
1028                               bond->params.updelay * bond->params.miimon);
1029                 if(bond->params.downdelay)
1030                         printk(KERN_INFO DRV_NAME
1031                               ": %s: Note: Updating downdelay (to %d) "
1032                               "since it is a multiple of the miimon value.\n",
1033                               bond->dev->name,
1034                               bond->params.downdelay * bond->params.miimon);
1035                 if (bond->params.arp_interval) {
1036                         printk(KERN_INFO DRV_NAME
1037                                ": %s: MII monitoring cannot be used with "
1038                                "ARP monitoring. Disabling ARP monitoring...\n",
1039                                bond->dev->name);
1040                         bond->params.arp_interval = 0;
1041                         if (bond->params.arp_validate) {
1042                                 bond_unregister_arp(bond);
1043                                 bond->params.arp_validate =
1044                                         BOND_ARP_VALIDATE_NONE;
1045                         }
1046                         if (delayed_work_pending(&bond->arp_work)) {
1047                                 cancel_delayed_work(&bond->arp_work);
1048                                 flush_workqueue(bond->wq);
1049                         }
1050                 }
1051
1052                 if (bond->dev->flags & IFF_UP) {
1053                         /* If the interface is up, we may need to fire off
1054                          * the MII timer. If the interface is down, the
1055                          * timer will get fired off when the open function
1056                          * is called.
1057                          */
1058                         if (!delayed_work_pending(&bond->mii_work)) {
1059                                 INIT_DELAYED_WORK(&bond->mii_work,
1060                                                   bond_mii_monitor);
1061                                 queue_delayed_work(bond->wq,
1062                                                    &bond->mii_work, 0);
1063                         }
1064                 }
1065         }
1066 out:
1067         return ret;
1068 }
1069 static DEVICE_ATTR(miimon, S_IRUGO | S_IWUSR, bonding_show_miimon, bonding_store_miimon);
1070
1071 /*
1072  * Show and set the primary slave.  The store function is much
1073  * simpler than bonding_store_slaves function because it only needs to
1074  * handle one interface name.
1075  * The bond must be a mode that supports a primary for this be
1076  * set.
1077  */
1078 static ssize_t bonding_show_primary(struct device *d,
1079                                     struct device_attribute *attr,
1080                                     char *buf)
1081 {
1082         int count = 0;
1083         struct bonding *bond = to_bond(d);
1084
1085         if (bond->primary_slave)
1086                 count = sprintf(buf, "%s\n", bond->primary_slave->dev->name) + 1;
1087         else
1088                 count = sprintf(buf, "\n") + 1;
1089
1090         return count;
1091 }
1092
1093 static ssize_t bonding_store_primary(struct device *d,
1094                                      struct device_attribute *attr,
1095                                      const char *buf, size_t count)
1096 {
1097         int i;
1098         struct slave *slave;
1099         struct bonding *bond = to_bond(d);
1100
1101         write_lock_bh(&bond->lock);
1102         if (!USES_PRIMARY(bond->params.mode)) {
1103                 printk(KERN_INFO DRV_NAME
1104                        ": %s: Unable to set primary slave; %s is in mode %d\n",
1105                        bond->dev->name, bond->dev->name, bond->params.mode);
1106         } else {
1107                 bond_for_each_slave(bond, slave, i) {
1108                         if (strnicmp
1109                             (slave->dev->name, buf,
1110                              strlen(slave->dev->name)) == 0) {
1111                                 printk(KERN_INFO DRV_NAME
1112                                        ": %s: Setting %s as primary slave.\n",
1113                                        bond->dev->name, slave->dev->name);
1114                                 bond->primary_slave = slave;
1115                                 bond_select_active_slave(bond);
1116                                 goto out;
1117                         }
1118                 }
1119
1120                 /* if we got here, then we didn't match the name of any slave */
1121
1122                 if (strlen(buf) == 0 || buf[0] == '\n') {
1123                         printk(KERN_INFO DRV_NAME
1124                                ": %s: Setting primary slave to None.\n",
1125                                bond->dev->name);
1126                         bond->primary_slave = NULL;
1127                                 bond_select_active_slave(bond);
1128                 } else {
1129                         printk(KERN_INFO DRV_NAME
1130                                ": %s: Unable to set %.*s as primary slave as it is not a slave.\n",
1131                                bond->dev->name, (int)strlen(buf) - 1, buf);
1132                 }
1133         }
1134 out:
1135         write_unlock_bh(&bond->lock);
1136
1137         rtnl_unlock();
1138
1139         return count;
1140 }
1141 static DEVICE_ATTR(primary, S_IRUGO | S_IWUSR, bonding_show_primary, bonding_store_primary);
1142
1143 /*
1144  * Show and set the use_carrier flag.
1145  */
1146 static ssize_t bonding_show_carrier(struct device *d,
1147                                     struct device_attribute *attr,
1148                                     char *buf)
1149 {
1150         struct bonding *bond = to_bond(d);
1151
1152         return sprintf(buf, "%d\n", bond->params.use_carrier) + 1;
1153 }
1154
1155 static ssize_t bonding_store_carrier(struct device *d,
1156                                      struct device_attribute *attr,
1157                                      const char *buf, size_t count)
1158 {
1159         int new_value, ret = count;
1160         struct bonding *bond = to_bond(d);
1161
1162
1163         if (sscanf(buf, "%d", &new_value) != 1) {
1164                 printk(KERN_ERR DRV_NAME
1165                        ": %s: no use_carrier value specified.\n",
1166                        bond->dev->name);
1167                 ret = -EINVAL;
1168                 goto out;
1169         }
1170         if ((new_value == 0) || (new_value == 1)) {
1171                 bond->params.use_carrier = new_value;
1172                 printk(KERN_INFO DRV_NAME ": %s: Setting use_carrier to %d.\n",
1173                        bond->dev->name, new_value);
1174         } else {
1175                 printk(KERN_INFO DRV_NAME
1176                        ": %s: Ignoring invalid use_carrier value %d.\n",
1177                        bond->dev->name, new_value);
1178         }
1179 out:
1180         return count;
1181 }
1182 static DEVICE_ATTR(use_carrier, S_IRUGO | S_IWUSR, bonding_show_carrier, bonding_store_carrier);
1183
1184
1185 /*
1186  * Show and set currently active_slave.
1187  */
1188 static ssize_t bonding_show_active_slave(struct device *d,
1189                                          struct device_attribute *attr,
1190                                          char *buf)
1191 {
1192         struct slave *curr;
1193         struct bonding *bond = to_bond(d);
1194         int count;
1195
1196         rtnl_lock();
1197
1198         read_lock(&bond->curr_slave_lock);
1199         curr = bond->curr_active_slave;
1200         read_unlock(&bond->curr_slave_lock);
1201
1202         if (USES_PRIMARY(bond->params.mode) && curr)
1203                 count = sprintf(buf, "%s\n", curr->dev->name) + 1;
1204         else
1205                 count = sprintf(buf, "\n") + 1;
1206         return count;
1207 }
1208
1209 static ssize_t bonding_store_active_slave(struct device *d,
1210                                           struct device_attribute *attr,
1211                                           const char *buf, size_t count)
1212 {
1213         int i;
1214         struct slave *slave;
1215         struct slave *old_active = NULL;
1216         struct slave *new_active = NULL;
1217         struct bonding *bond = to_bond(d);
1218
1219         write_lock_bh(&bond->lock);
1220         if (!USES_PRIMARY(bond->params.mode)) {
1221                 printk(KERN_INFO DRV_NAME
1222                        ": %s: Unable to change active slave; %s is in mode %d\n",
1223                        bond->dev->name, bond->dev->name, bond->params.mode);
1224         } else {
1225                 bond_for_each_slave(bond, slave, i) {
1226                         if (strnicmp
1227                             (slave->dev->name, buf,
1228                              strlen(slave->dev->name)) == 0) {
1229                                 old_active = bond->curr_active_slave;
1230                                 new_active = slave;
1231                                 if (new_active == old_active) {
1232                                         /* do nothing */
1233                                         printk(KERN_INFO DRV_NAME
1234                                                ": %s: %s is already the current active slave.\n",
1235                                                bond->dev->name, slave->dev->name);
1236                                         goto out;
1237                                 }
1238                                 else {
1239                                         if ((new_active) &&
1240                                             (old_active) &&
1241                                             (new_active->link == BOND_LINK_UP) &&
1242                                             IS_UP(new_active->dev)) {
1243                                                 printk(KERN_INFO DRV_NAME
1244                                                       ": %s: Setting %s as active slave.\n",
1245                                                       bond->dev->name, slave->dev->name);
1246                                                 bond_change_active_slave(bond, new_active);
1247                                         }
1248                                         else {
1249                                                 printk(KERN_INFO DRV_NAME
1250                                                       ": %s: Could not set %s as active slave; "
1251                                                       "either %s is down or the link is down.\n",
1252                                                       bond->dev->name, slave->dev->name,
1253                                                       slave->dev->name);
1254                                         }
1255                                         goto out;
1256                                 }
1257                         }
1258                 }
1259
1260                 /* if we got here, then we didn't match the name of any slave */
1261
1262                 if (strlen(buf) == 0 || buf[0] == '\n') {
1263                         printk(KERN_INFO DRV_NAME
1264                                ": %s: Setting active slave to None.\n",
1265                                bond->dev->name);
1266                         bond->primary_slave = NULL;
1267                                 bond_select_active_slave(bond);
1268                 } else {
1269                         printk(KERN_INFO DRV_NAME
1270                                ": %s: Unable to set %.*s as active slave as it is not a slave.\n",
1271                                bond->dev->name, (int)strlen(buf) - 1, buf);
1272                 }
1273         }
1274 out:
1275         write_unlock_bh(&bond->lock);
1276         rtnl_unlock();
1277
1278         return count;
1279
1280 }
1281 static DEVICE_ATTR(active_slave, S_IRUGO | S_IWUSR, bonding_show_active_slave, bonding_store_active_slave);
1282
1283
1284 /*
1285  * Show link status of the bond interface.
1286  */
1287 static ssize_t bonding_show_mii_status(struct device *d,
1288                                        struct device_attribute *attr,
1289                                        char *buf)
1290 {
1291         struct slave *curr;
1292         struct bonding *bond = to_bond(d);
1293
1294         read_lock(&bond->curr_slave_lock);
1295         curr = bond->curr_active_slave;
1296         read_unlock(&bond->curr_slave_lock);
1297
1298         return sprintf(buf, "%s\n", (curr) ? "up" : "down") + 1;
1299 }
1300 static DEVICE_ATTR(mii_status, S_IRUGO, bonding_show_mii_status, NULL);
1301
1302
1303 /*
1304  * Show current 802.3ad aggregator ID.
1305  */
1306 static ssize_t bonding_show_ad_aggregator(struct device *d,
1307                                           struct device_attribute *attr,
1308                                           char *buf)
1309 {
1310         int count = 0;
1311         struct bonding *bond = to_bond(d);
1312
1313         if (bond->params.mode == BOND_MODE_8023AD) {
1314                 struct ad_info ad_info;
1315                 count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.aggregator_id) + 1;
1316         }
1317         else
1318                 count = sprintf(buf, "\n") + 1;
1319
1320         return count;
1321 }
1322 static DEVICE_ATTR(ad_aggregator, S_IRUGO, bonding_show_ad_aggregator, NULL);
1323
1324
1325 /*
1326  * Show number of active 802.3ad ports.
1327  */
1328 static ssize_t bonding_show_ad_num_ports(struct device *d,
1329                                          struct device_attribute *attr,
1330                                          char *buf)
1331 {
1332         int count = 0;
1333         struct bonding *bond = to_bond(d);
1334
1335         if (bond->params.mode == BOND_MODE_8023AD) {
1336                 struct ad_info ad_info;
1337                 count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0: ad_info.ports) + 1;
1338         }
1339         else
1340                 count = sprintf(buf, "\n") + 1;
1341
1342         return count;
1343 }
1344 static DEVICE_ATTR(ad_num_ports, S_IRUGO, bonding_show_ad_num_ports, NULL);
1345
1346
1347 /*
1348  * Show current 802.3ad actor key.
1349  */
1350 static ssize_t bonding_show_ad_actor_key(struct device *d,
1351                                          struct device_attribute *attr,
1352                                          char *buf)
1353 {
1354         int count = 0;
1355         struct bonding *bond = to_bond(d);
1356
1357         if (bond->params.mode == BOND_MODE_8023AD) {
1358                 struct ad_info ad_info;
1359                 count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.actor_key) + 1;
1360         }
1361         else
1362                 count = sprintf(buf, "\n") + 1;
1363
1364         return count;
1365 }
1366 static DEVICE_ATTR(ad_actor_key, S_IRUGO, bonding_show_ad_actor_key, NULL);
1367
1368
1369 /*
1370  * Show current 802.3ad partner key.
1371  */
1372 static ssize_t bonding_show_ad_partner_key(struct device *d,
1373                                            struct device_attribute *attr,
1374                                            char *buf)
1375 {
1376         int count = 0;
1377         struct bonding *bond = to_bond(d);
1378
1379         if (bond->params.mode == BOND_MODE_8023AD) {
1380                 struct ad_info ad_info;
1381                 count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.partner_key) + 1;
1382         }
1383         else
1384                 count = sprintf(buf, "\n") + 1;
1385
1386         return count;
1387 }
1388 static DEVICE_ATTR(ad_partner_key, S_IRUGO, bonding_show_ad_partner_key, NULL);
1389
1390
1391 /*
1392  * Show current 802.3ad partner mac.
1393  */
1394 static ssize_t bonding_show_ad_partner_mac(struct device *d,
1395                                            struct device_attribute *attr,
1396                                            char *buf)
1397 {
1398         int count = 0;
1399         struct bonding *bond = to_bond(d);
1400         DECLARE_MAC_BUF(mac);
1401
1402         if (bond->params.mode == BOND_MODE_8023AD) {
1403                 struct ad_info ad_info;
1404                 if (!bond_3ad_get_active_agg_info(bond, &ad_info)) {
1405                         count = sprintf(buf,"%s\n",
1406                                         print_mac(mac, ad_info.partner_system))
1407                                 + 1;
1408                 }
1409         }
1410         else
1411                 count = sprintf(buf, "\n") + 1;
1412
1413         return count;
1414 }
1415 static DEVICE_ATTR(ad_partner_mac, S_IRUGO, bonding_show_ad_partner_mac, NULL);
1416
1417
1418
1419 static struct attribute *per_bond_attrs[] = {
1420         &dev_attr_slaves.attr,
1421         &dev_attr_mode.attr,
1422         &dev_attr_fail_over_mac.attr,
1423         &dev_attr_arp_validate.attr,
1424         &dev_attr_arp_interval.attr,
1425         &dev_attr_arp_ip_target.attr,
1426         &dev_attr_downdelay.attr,
1427         &dev_attr_updelay.attr,
1428         &dev_attr_lacp_rate.attr,
1429         &dev_attr_xmit_hash_policy.attr,
1430         &dev_attr_miimon.attr,
1431         &dev_attr_primary.attr,
1432         &dev_attr_use_carrier.attr,
1433         &dev_attr_active_slave.attr,
1434         &dev_attr_mii_status.attr,
1435         &dev_attr_ad_aggregator.attr,
1436         &dev_attr_ad_num_ports.attr,
1437         &dev_attr_ad_actor_key.attr,
1438         &dev_attr_ad_partner_key.attr,
1439         &dev_attr_ad_partner_mac.attr,
1440         NULL,
1441 };
1442
1443 static struct attribute_group bonding_group = {
1444         .name = "bonding",
1445         .attrs = per_bond_attrs,
1446 };
1447
1448 /*
1449  * Initialize sysfs.  This sets up the bonding_masters file in
1450  * /sys/class/net.
1451  */
1452 int bond_create_sysfs(void)
1453 {
1454         int ret = 0;
1455         struct bonding *firstbond;
1456
1457         init_rwsem(&bonding_rwsem);
1458
1459         /* get the netdev class pointer */
1460         firstbond = container_of(bond_dev_list.next, struct bonding, bond_list);
1461         if (!firstbond)
1462                 return -ENODEV;
1463
1464         netdev_class = firstbond->dev->dev.class;
1465         if (!netdev_class)
1466                 return -ENODEV;
1467
1468         ret = class_create_file(netdev_class, &class_attr_bonding_masters);
1469         /*
1470          * Permit multiple loads of the module by ignoring failures to
1471          * create the bonding_masters sysfs file.  Bonding devices
1472          * created by second or subsequent loads of the module will
1473          * not be listed in, or controllable by, bonding_masters, but
1474          * will have the usual "bonding" sysfs directory.
1475          *
1476          * This is done to preserve backwards compatibility for
1477          * initscripts/sysconfig, which load bonding multiple times to
1478          * configure multiple bonding devices.
1479          */
1480         if (ret == -EEXIST) {
1481                 netdev_class = NULL;
1482                 return 0;
1483         }
1484
1485         return ret;
1486
1487 }
1488
1489 /*
1490  * Remove /sys/class/net/bonding_masters.
1491  */
1492 void bond_destroy_sysfs(void)
1493 {
1494         if (netdev_class)
1495                 class_remove_file(netdev_class, &class_attr_bonding_masters);
1496 }
1497
1498 /*
1499  * Initialize sysfs for each bond.  This sets up and registers
1500  * the 'bondctl' directory for each individual bond under /sys/class/net.
1501  */
1502 int bond_create_sysfs_entry(struct bonding *bond)
1503 {
1504         struct net_device *dev = bond->dev;
1505         int err;
1506
1507         err = sysfs_create_group(&(dev->dev.kobj), &bonding_group);
1508         if (err) {
1509                 printk(KERN_EMERG "eek! didn't create group!\n");
1510         }
1511
1512         if (expected_refcount < 1)
1513                 expected_refcount = atomic_read(&bond->dev->dev.kobj.kref.refcount);
1514
1515         return err;
1516 }
1517 /*
1518  * Remove sysfs entries for each bond.
1519  */
1520 void bond_destroy_sysfs_entry(struct bonding *bond)
1521 {
1522         struct net_device *dev = bond->dev;
1523
1524         sysfs_remove_group(&(dev->dev.kobj), &bonding_group);
1525 }
1526