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 subsytem 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_bh(&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_bh(&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_bh(&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_bh(&bond->lock);
 293                                 goto out;
 294                         }
 295
 296                 read_unlock_bh(&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                 /* Kill MII timer, else it brings bond's link down */
 666                 if (bond->arp_timer.function) {
 667                         printk(KERN_INFO DRV_NAME
 668                         ": %s: Kill MII timer, else it brings bond's link down...\n",
 669                        bond->dev->name);
 670                         del_timer_sync(&bond->mii_timer);
 671                 }
 672         }
 673         if (!bond->params.arp_targets[0]) {
 674                 printk(KERN_INFO DRV_NAME
 675                        ": %s: ARP monitoring has been set up, "
 676                        "but no ARP targets have been specified.\n",
 677                        bond->dev->name);
 678         }
 679         if (bond->dev->flags & IFF_UP) {
 680                 /* If the interface is up, we may need to fire off
 681                  * the ARP timer.  If the interface is down, the
 682                  * timer will get fired off when the open function
 683                  * is called.
 684                  */
 685                 if (bond->arp_timer.function) {
 686                         /* The timer's already set up, so fire it off */
 687                         mod_timer(&bond->arp_timer, jiffies + 1);
 688                 } else {
 689                         /* Set up the timer. */
 690                         init_timer(&bond->arp_timer);
 691                         bond->arp_timer.expires = jiffies + 1;
 692                         bond->arp_timer.data =
 693                                 (unsigned long) bond->dev;
 694                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP) {
 695                                 bond->arp_timer.function =
 696                                         (void *)
 697                                         &bond_activebackup_arp_mon;
 698                         } else {
 699                                 bond->arp_timer.function =
 700                                         (void *)
 701                                         &bond_loadbalance_arp_mon;
 702                         }
 703                         add_timer(&bond->arp_timer);
 704                 }
 705         }
 706
 707 out:
 708         return ret;
 709 }
 710 static DEVICE_ATTR(arp_interval, S_IRUGO | S_IWUSR , bonding_show_arp_interval, bonding_store_arp_interval);
 711
 712 /*
 713  * Show and set the arp targets.
 714  */
 715 static ssize_t bonding_show_arp_targets(struct device *d,
 716                                         struct device_attribute *attr,
 717                                         char *buf)
 718 {
 719         int i, res = 0;
 720         struct bonding *bond = to_bond(d);
 721
 722         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) {
 723                 if (bond->params.arp_targets[i])
 724                         res += sprintf(buf + res, "%u.%u.%u.%u ",
 725                                NIPQUAD(bond->params.arp_targets[i]));
 726         }
 727         if (res)
 728                 res--;  /* eat the leftover space */
 729         res += sprintf(buf + res, "\n");
 730         res++;
 731         return res;
 732 }
 733
 734 static ssize_t bonding_store_arp_targets(struct device *d,
 735                                          struct device_attribute *attr,
 736                                          const char *buf, size_t count)
 737 {
 738         __be32 newtarget;
 739         int i = 0, done = 0, ret = count;
 740         struct bonding *bond = to_bond(d);
 741         __be32 *targets;
 742
 743         targets = bond->params.arp_targets;
 744         newtarget = in_aton(buf + 1);
 745         /* look for adds */
 746         if (buf[0] == '+') {
 747                 if ((newtarget == 0) || (newtarget == htonl(INADDR_BROADCAST))) {
 748                         printk(KERN_ERR DRV_NAME
 749                                ": %s: invalid ARP target %u.%u.%u.%u specified for addition\n",
 750                                bond->dev->name, NIPQUAD(newtarget));
 751                         ret = -EINVAL;
 752                         goto out;
 753                 }
 754                 /* look for an empty slot to put the target in, and check for dupes */
 755                 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
 756                         if (targets[i] == newtarget) { /* duplicate */
 757                                 printk(KERN_ERR DRV_NAME
 758                                        ": %s: ARP target %u.%u.%u.%u is already present\n",
 759                                        bond->dev->name, NIPQUAD(newtarget));
 760                                 if (done)
 761                                         targets[i] = 0;
 762                                 ret = -EINVAL;
 763                                 goto out;
 764                         }
 765                         if (targets[i] == 0 && !done) {
 766                                 printk(KERN_INFO DRV_NAME
 767                                        ": %s: adding ARP target %d.%d.%d.%d.\n",
 768                                        bond->dev->name, NIPQUAD(newtarget));
 769                                 done = 1;
 770                                 targets[i] = newtarget;
 771                         }
 772                 }
 773                 if (!done) {
 774                         printk(KERN_ERR DRV_NAME
 775                                ": %s: ARP target table is full!\n",
 776                                bond->dev->name);
 777                         ret = -EINVAL;
 778                         goto out;
 779                 }
 780
 781         }
 782         else if (buf[0] == '-') {
 783                 if ((newtarget == 0) || (newtarget == htonl(INADDR_BROADCAST))) {
 784                         printk(KERN_ERR DRV_NAME
 785                                ": %s: invalid ARP target %d.%d.%d.%d specified for removal\n",
 786                                bond->dev->name, NIPQUAD(newtarget));
 787                         ret = -EINVAL;
 788                         goto out;
 789                 }
 790
 791                 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
 792                         if (targets[i] == newtarget) {
 793                                 printk(KERN_INFO DRV_NAME
 794                                        ": %s: removing ARP target %d.%d.%d.%d.\n",
 795                                        bond->dev->name, NIPQUAD(newtarget));
 796                                 targets[i] = 0;
 797                                 done = 1;
 798                         }
 799                 }
 800                 if (!done) {
 801                         printk(KERN_INFO DRV_NAME
 802                                ": %s: unable to remove nonexistent ARP target %d.%d.%d.%d.\n",
 803                                bond->dev->name, NIPQUAD(newtarget));
 804                         ret = -EINVAL;
 805                         goto out;
 806                 }
 807         }
 808         else {
 809                 printk(KERN_ERR DRV_NAME ": no command found in arp_ip_targets file for bond %s. Use +<addr> or -<addr>.\n",
 810                         bond->dev->name);
 811                 ret = -EPERM;
 812                 goto out;
 813         }
 814
 815 out:
 816         return ret;
 817 }
 818 static DEVICE_ATTR(arp_ip_target, S_IRUGO | S_IWUSR , bonding_show_arp_targets, bonding_store_arp_targets);
 819
 820 /*
 821  * Show and set the up and down delays.  These must be multiples of the
 822  * MII monitoring value, and are stored internally as the multiplier.
 823  * Thus, we must translate to MS for the real world.
 824  */
 825 static ssize_t bonding_show_downdelay(struct device *d,
 826                                       struct device_attribute *attr,
 827                                       char *buf)
 828 {
 829         struct bonding *bond = to_bond(d);
 830
 831         return sprintf(buf, "%d\n", bond->params.downdelay * bond->params.miimon) + 1;
 832 }
 833
 834 static ssize_t bonding_store_downdelay(struct device *d,
 835                                        struct device_attribute *attr,
 836                                        const char *buf, size_t count)
 837 {
 838         int new_value, ret = count;
 839         struct bonding *bond = to_bond(d);
 840
 841         if (!(bond->params.miimon)) {
 842                 printk(KERN_ERR DRV_NAME
 843                        ": %s: Unable to set down delay as MII monitoring is disabled\n",
 844                        bond->dev->name);
 845                 ret = -EPERM;
 846                 goto out;
 847         }
 848
 849         if (sscanf(buf, "%d", &new_value) != 1) {
 850                 printk(KERN_ERR DRV_NAME
 851                        ": %s: no down delay value specified.\n",
 852                        bond->dev->name);
 853                 ret = -EINVAL;
 854                 goto out;
 855         }
 856         if (new_value < 0) {
 857                 printk(KERN_ERR DRV_NAME
 858                        ": %s: Invalid down delay value %d not in range %d-%d; rejected.\n",
 859                        bond->dev->name, new_value, 1, INT_MAX);
 860                 ret = -EINVAL;
 861                 goto out;
 862         } else {
 863                 if ((new_value % bond->params.miimon) != 0) {
 864                         printk(KERN_WARNING DRV_NAME
 865                                ": %s: Warning: down delay (%d) is not a multiple "
 866                                "of miimon (%d), delay rounded to %d ms\n",
 867                                bond->dev->name, new_value, bond->params.miimon,
 868                                (new_value / bond->params.miimon) *
 869                                bond->params.miimon);
 870                 }
 871                 bond->params.downdelay = new_value / bond->params.miimon;
 872                 printk(KERN_INFO DRV_NAME ": %s: Setting down delay to %d.\n",
 873                        bond->dev->name, bond->params.downdelay * bond->params.miimon);
 874
 875         }
 876
 877 out:
 878         return ret;
 879 }
 880 static DEVICE_ATTR(downdelay, S_IRUGO | S_IWUSR , bonding_show_downdelay, bonding_store_downdelay);
 881
 882 static ssize_t bonding_show_updelay(struct device *d,
 883                                     struct device_attribute *attr,
 884                                     char *buf)
 885 {
 886         struct bonding *bond = to_bond(d);
 887
 888         return sprintf(buf, "%d\n", bond->params.updelay * bond->params.miimon) + 1;
 889
 890 }
 891
 892 static ssize_t bonding_store_updelay(struct device *d,
 893                                      struct device_attribute *attr,
 894                                      const char *buf, size_t count)
 895 {
 896         int new_value, ret = count;
 897         struct bonding *bond = to_bond(d);
 898
 899         if (!(bond->params.miimon)) {
 900                 printk(KERN_ERR DRV_NAME
 901                        ": %s: Unable to set up delay as MII monitoring is disabled\n",
 902                        bond->dev->name);
 903                 ret = -EPERM;
 904                 goto out;
 905         }
 906
 907         if (sscanf(buf, "%d", &new_value) != 1) {
 908                 printk(KERN_ERR DRV_NAME
 909                        ": %s: no up delay value specified.\n",
 910                        bond->dev->name);
 911                 ret = -EINVAL;
 912                 goto out;
 913         }
 914         if (new_value < 0) {
 915                 printk(KERN_ERR DRV_NAME
 916                        ": %s: Invalid down delay value %d not in range %d-%d; rejected.\n",
 917                        bond->dev->name, new_value, 1, INT_MAX);
 918                 ret = -EINVAL;
 919                 goto out;
 920         } else {
 921                 if ((new_value % bond->params.miimon) != 0) {
 922                         printk(KERN_WARNING DRV_NAME
 923                                ": %s: Warning: up delay (%d) is not a multiple "
 924                                "of miimon (%d), updelay rounded to %d ms\n",
 925                                bond->dev->name, new_value, bond->params.miimon,
 926                                (new_value / bond->params.miimon) *
 927                                bond->params.miimon);
 928                 }
 929                 bond->params.updelay = new_value / bond->params.miimon;
 930                 printk(KERN_INFO DRV_NAME ": %s: Setting up delay to %d.\n",
 931                        bond->dev->name, bond->params.updelay * bond->params.miimon);
 932
 933         }
 934
 935 out:
 936         return ret;
 937 }
 938 static DEVICE_ATTR(updelay, S_IRUGO | S_IWUSR , bonding_show_updelay, bonding_store_updelay);
 939
 940 /*
 941  * Show and set the LACP interval.  Interface must be down, and the mode
 942  * must be set to 802.3ad mode.
 943  */
 944 static ssize_t bonding_show_lacp(struct device *d,
 945                                  struct device_attribute *attr,
 946                                  char *buf)
 947 {
 948         struct bonding *bond = to_bond(d);
 949
 950         return sprintf(buf, "%s %d\n",
 951                 bond_lacp_tbl[bond->params.lacp_fast].modename,
 952                 bond->params.lacp_fast) + 1;
 953 }
 954
 955 static ssize_t bonding_store_lacp(struct device *d,
 956                                   struct device_attribute *attr,
 957                                   const char *buf, size_t count)
 958 {
 959         int new_value, ret = count;
 960         struct bonding *bond = to_bond(d);
 961
 962         if (bond->dev->flags & IFF_UP) {
 963                 printk(KERN_ERR DRV_NAME
 964                        ": %s: Unable to update LACP rate because interface is up.\n",
 965                        bond->dev->name);
 966                 ret = -EPERM;
 967                 goto out;
 968         }
 969
 970         if (bond->params.mode != BOND_MODE_8023AD) {
 971                 printk(KERN_ERR DRV_NAME
 972                        ": %s: Unable to update LACP rate because bond is not in 802.3ad mode.\n",
 973                        bond->dev->name);
 974                 ret = -EPERM;
 975                 goto out;
 976         }
 977
 978         new_value = bond_parse_parm((char *)buf, bond_lacp_tbl);
 979
 980         if ((new_value == 1) || (new_value == 0)) {
 981                 bond->params.lacp_fast = new_value;
 982                 printk(KERN_INFO DRV_NAME
 983                        ": %s: Setting LACP rate to %s (%d).\n",
 984                        bond->dev->name, bond_lacp_tbl[new_value].modename, new_value);
 985         } else {
 986                 printk(KERN_ERR DRV_NAME
 987                        ": %s: Ignoring invalid LACP rate value %.*s.\n",
 988                         bond->dev->name, (int)strlen(buf) - 1, buf);
 989                 ret = -EINVAL;
 990         }
 991 out:
 992         return ret;
 993 }
 994 static DEVICE_ATTR(lacp_rate, S_IRUGO | S_IWUSR, bonding_show_lacp, bonding_store_lacp);
 995
 996 /*
 997  * Show and set the MII monitor interval.  There are two tricky bits
 998  * here.  First, if MII monitoring is activated, then we must disable
 999  * ARP monitoring.  Second, if the timer isn't running, we must
1000  * start it.
1001  */
1002 static ssize_t bonding_show_miimon(struct device *d,
1003                                    struct device_attribute *attr,
1004                                    char *buf)
1005 {
1006         struct bonding *bond = to_bond(d);
1007
1008         return sprintf(buf, "%d\n", bond->params.miimon) + 1;
1009 }
1010
1011 static ssize_t bonding_store_miimon(struct device *d,
1012                                     struct device_attribute *attr,
1013                                     const char *buf, size_t count)
1014 {
1015         int new_value, ret = count;
1016         struct bonding *bond = to_bond(d);
1017
1018         if (sscanf(buf, "%d", &new_value) != 1) {
1019                 printk(KERN_ERR DRV_NAME
1020                        ": %s: no miimon value specified.\n",
1021                        bond->dev->name);
1022                 ret = -EINVAL;
1023                 goto out;
1024         }
1025         if (new_value < 0) {
1026                 printk(KERN_ERR DRV_NAME
1027                        ": %s: Invalid miimon value %d not in range %d-%d; rejected.\n",
1028                        bond->dev->name, new_value, 1, INT_MAX);
1029                 ret = -EINVAL;
1030                 goto out;
1031         } else {
1032                 printk(KERN_INFO DRV_NAME
1033                        ": %s: Setting MII monitoring interval to %d.\n",
1034                        bond->dev->name, new_value);
1035                 bond->params.miimon = new_value;
1036                 if(bond->params.updelay)
1037                         printk(KERN_INFO DRV_NAME
1038                               ": %s: Note: Updating updelay (to %d) "
1039                               "since it is a multiple of the miimon value.\n",
1040                               bond->dev->name,
1041                               bond->params.updelay * bond->params.miimon);
1042                 if(bond->params.downdelay)
1043                         printk(KERN_INFO DRV_NAME
1044                               ": %s: Note: Updating downdelay (to %d) "
1045                               "since it is a multiple of the miimon value.\n",
1046                               bond->dev->name,
1047                               bond->params.downdelay * bond->params.miimon);
1048                 if (bond->params.arp_interval) {
1049                         printk(KERN_INFO DRV_NAME
1050                                ": %s: MII monitoring cannot be used with "
1051                                "ARP monitoring. Disabling ARP monitoring...\n",
1052                                bond->dev->name);
1053                         bond->params.arp_interval = 0;
1054                         if (bond->params.arp_validate) {
1055                                 bond_unregister_arp(bond);
1056                                 bond->params.arp_validate =
1057                                         BOND_ARP_VALIDATE_NONE;
1058                         }
1059                         /* Kill ARP timer, else it brings bond's link down */
1060                         if (bond->mii_timer.function) {
1061                                 printk(KERN_INFO DRV_NAME
1062                                 ": %s: Kill ARP timer, else it brings bond's link down...\n",
1063                                bond->dev->name);
1064                                 del_timer_sync(&bond->arp_timer);
1065                         }
1066                 }
1067
1068                 if (bond->dev->flags & IFF_UP) {
1069                         /* If the interface is up, we may need to fire off
1070                          * the MII timer. If the interface is down, the
1071                          * timer will get fired off when the open function
1072                          * is called.
1073                          */
1074                         if (bond->mii_timer.function) {
1075                                 /* The timer's already set up, so fire it off */
1076                                 mod_timer(&bond->mii_timer, jiffies + 1);
1077                         } else {
1078                                 /* Set up the timer. */
1079                                 init_timer(&bond->mii_timer);
1080                                 bond->mii_timer.expires = jiffies + 1;
1081                                 bond->mii_timer.data =
1082                                         (unsigned long) bond->dev;
1083                                 bond->mii_timer.function =
1084                                         (void *) &bond_mii_monitor;
1085                                 add_timer(&bond->mii_timer);
1086                         }
1087                 }
1088         }
1089 out:
1090         return ret;
1091 }
1092 static DEVICE_ATTR(miimon, S_IRUGO | S_IWUSR, bonding_show_miimon, bonding_store_miimon);
1093
1094 /*
1095  * Show and set the primary slave.  The store function is much
1096  * simpler than bonding_store_slaves function because it only needs to
1097  * handle one interface name.
1098  * The bond must be a mode that supports a primary for this be
1099  * set.
1100  */
1101 static ssize_t bonding_show_primary(struct device *d,
1102                                     struct device_attribute *attr,
1103                                     char *buf)
1104 {
1105         int count = 0;
1106         struct bonding *bond = to_bond(d);
1107
1108         if (bond->primary_slave)
1109                 count = sprintf(buf, "%s\n", bond->primary_slave->dev->name) + 1;
1110         else
1111                 count = sprintf(buf, "\n") + 1;
1112
1113         return count;
1114 }
1115
1116 static ssize_t bonding_store_primary(struct device *d,
1117                                      struct device_attribute *attr,
1118                                      const char *buf, size_t count)
1119 {
1120         int i;
1121         struct slave *slave;
1122         struct bonding *bond = to_bond(d);
1123
1124         write_lock_bh(&bond->lock);
1125         if (!USES_PRIMARY(bond->params.mode)) {
1126                 printk(KERN_INFO DRV_NAME
1127                        ": %s: Unable to set primary slave; %s is in mode %d\n",
1128                        bond->dev->name, bond->dev->name, bond->params.mode);
1129         } else {
1130                 bond_for_each_slave(bond, slave, i) {
1131                         if (strnicmp
1132                             (slave->dev->name, buf,
1133                              strlen(slave->dev->name)) == 0) {
1134                                 printk(KERN_INFO DRV_NAME
1135                                        ": %s: Setting %s as primary slave.\n",
1136                                        bond->dev->name, slave->dev->name);
1137                                 bond->primary_slave = slave;
1138                                 bond_select_active_slave(bond);
1139                                 goto out;
1140                         }
1141                 }
1142
1143                 /* if we got here, then we didn't match the name of any slave */
1144
1145                 if (strlen(buf) == 0 || buf[0] == '\n') {
1146                         printk(KERN_INFO DRV_NAME
1147                                ": %s: Setting primary slave to None.\n",
1148                                bond->dev->name);
1149                         bond->primary_slave = NULL;
1150                                 bond_select_active_slave(bond);
1151                 } else {
1152                         printk(KERN_INFO DRV_NAME
1153                                ": %s: Unable to set %.*s as primary slave as it is not a slave.\n",
1154                                bond->dev->name, (int)strlen(buf) - 1, buf);
1155                 }
1156         }
1157 out:
1158         write_unlock_bh(&bond->lock);
1159         return count;
1160 }
1161 static DEVICE_ATTR(primary, S_IRUGO | S_IWUSR, bonding_show_primary, bonding_store_primary);
1162
1163 /*
1164  * Show and set the use_carrier flag.
1165  */
1166 static ssize_t bonding_show_carrier(struct device *d,
1167                                     struct device_attribute *attr,
1168                                     char *buf)
1169 {
1170         struct bonding *bond = to_bond(d);
1171
1172         return sprintf(buf, "%d\n", bond->params.use_carrier) + 1;
1173 }
1174
1175 static ssize_t bonding_store_carrier(struct device *d,
1176                                      struct device_attribute *attr,
1177                                      const char *buf, size_t count)
1178 {
1179         int new_value, ret = count;
1180         struct bonding *bond = to_bond(d);
1181
1182
1183         if (sscanf(buf, "%d", &new_value) != 1) {
1184                 printk(KERN_ERR DRV_NAME
1185                        ": %s: no use_carrier value specified.\n",
1186                        bond->dev->name);
1187                 ret = -EINVAL;
1188                 goto out;
1189         }
1190         if ((new_value == 0) || (new_value == 1)) {
1191                 bond->params.use_carrier = new_value;
1192                 printk(KERN_INFO DRV_NAME ": %s: Setting use_carrier to %d.\n",
1193                        bond->dev->name, new_value);
1194         } else {
1195                 printk(KERN_INFO DRV_NAME
1196                        ": %s: Ignoring invalid use_carrier value %d.\n",
1197                        bond->dev->name, new_value);
1198         }
1199 out:
1200         return count;
1201 }
1202 static DEVICE_ATTR(use_carrier, S_IRUGO | S_IWUSR, bonding_show_carrier, bonding_store_carrier);
1203
1204
1205 /*
1206  * Show and set currently active_slave.
1207  */
1208 static ssize_t bonding_show_active_slave(struct device *d,
1209                                          struct device_attribute *attr,
1210                                          char *buf)
1211 {
1212         struct slave *curr;
1213         struct bonding *bond = to_bond(d);
1214         int count;
1215
1216
1217         read_lock(&bond->curr_slave_lock);
1218         curr = bond->curr_active_slave;
1219         read_unlock(&bond->curr_slave_lock);
1220
1221         if (USES_PRIMARY(bond->params.mode) && curr)
1222                 count = sprintf(buf, "%s\n", curr->dev->name) + 1;
1223         else
1224                 count = sprintf(buf, "\n") + 1;
1225         return count;
1226 }
1227
1228 static ssize_t bonding_store_active_slave(struct device *d,
1229                                           struct device_attribute *attr,
1230                                           const char *buf, size_t count)
1231 {
1232         int i;
1233         struct slave *slave;
1234         struct slave *old_active = NULL;
1235         struct slave *new_active = NULL;
1236         struct bonding *bond = to_bond(d);
1237
1238         write_lock_bh(&bond->lock);
1239         if (!USES_PRIMARY(bond->params.mode)) {
1240                 printk(KERN_INFO DRV_NAME
1241                        ": %s: Unable to change active slave; %s is in mode %d\n",
1242                        bond->dev->name, bond->dev->name, bond->params.mode);
1243         } else {
1244                 bond_for_each_slave(bond, slave, i) {
1245                         if (strnicmp
1246                             (slave->dev->name, buf,
1247                              strlen(slave->dev->name)) == 0) {
1248                                 old_active = bond->curr_active_slave;
1249                                 new_active = slave;
1250                                 if (new_active == old_active) {
1251                                         /* do nothing */
1252                                         printk(KERN_INFO DRV_NAME
1253                                                ": %s: %s is already the current active slave.\n",
1254                                                bond->dev->name, slave->dev->name);
1255                                         goto out;
1256                                 }
1257                                 else {
1258                                         if ((new_active) &&
1259                                             (old_active) &&
1260                                             (new_active->link == BOND_LINK_UP) &&
1261                                             IS_UP(new_active->dev)) {
1262                                                 printk(KERN_INFO DRV_NAME
1263                                                       ": %s: Setting %s as active slave.\n",
1264                                                       bond->dev->name, slave->dev->name);
1265                                                 bond_change_active_slave(bond, new_active);
1266                                         }
1267                                         else {
1268                                                 printk(KERN_INFO DRV_NAME
1269                                                       ": %s: Could not set %s as active slave; "
1270                                                       "either %s is down or the link is down.\n",
1271                                                       bond->dev->name, slave->dev->name,
1272                                                       slave->dev->name);
1273                                         }
1274                                         goto out;
1275                                 }
1276                         }
1277                 }
1278
1279                 /* if we got here, then we didn't match the name of any slave */
1280
1281                 if (strlen(buf) == 0 || buf[0] == '\n') {
1282                         printk(KERN_INFO DRV_NAME
1283                                ": %s: Setting active slave to None.\n",
1284                                bond->dev->name);
1285                         bond->primary_slave = NULL;
1286                                 bond_select_active_slave(bond);
1287                 } else {
1288                         printk(KERN_INFO DRV_NAME
1289                                ": %s: Unable to set %.*s as active slave as it is not a slave.\n",
1290                                bond->dev->name, (int)strlen(buf) - 1, buf);
1291                 }
1292         }
1293 out:
1294         write_unlock_bh(&bond->lock);
1295         return count;
1296
1297 }
1298 static DEVICE_ATTR(active_slave, S_IRUGO | S_IWUSR, bonding_show_active_slave, bonding_store_active_slave);
1299
1300
1301 /*
1302  * Show link status of the bond interface.
1303  */
1304 static ssize_t bonding_show_mii_status(struct device *d,
1305                                        struct device_attribute *attr,
1306                                        char *buf)
1307 {
1308         struct slave *curr;
1309         struct bonding *bond = to_bond(d);
1310
1311         read_lock(&bond->curr_slave_lock);
1312         curr = bond->curr_active_slave;
1313         read_unlock(&bond->curr_slave_lock);
1314
1315         return sprintf(buf, "%s\n", (curr) ? "up" : "down") + 1;
1316 }
1317 static DEVICE_ATTR(mii_status, S_IRUGO, bonding_show_mii_status, NULL);
1318
1319
1320 /*
1321  * Show current 802.3ad aggregator ID.
1322  */
1323 static ssize_t bonding_show_ad_aggregator(struct device *d,
1324                                           struct device_attribute *attr,
1325                                           char *buf)
1326 {
1327         int count = 0;
1328         struct bonding *bond = to_bond(d);
1329
1330         if (bond->params.mode == BOND_MODE_8023AD) {
1331                 struct ad_info ad_info;
1332                 count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.aggregator_id) + 1;
1333         }
1334         else
1335                 count = sprintf(buf, "\n") + 1;
1336
1337         return count;
1338 }
1339 static DEVICE_ATTR(ad_aggregator, S_IRUGO, bonding_show_ad_aggregator, NULL);
1340
1341
1342 /*
1343  * Show number of active 802.3ad ports.
1344  */
1345 static ssize_t bonding_show_ad_num_ports(struct device *d,
1346                                          struct device_attribute *attr,
1347                                          char *buf)
1348 {
1349         int count = 0;
1350         struct bonding *bond = to_bond(d);
1351
1352         if (bond->params.mode == BOND_MODE_8023AD) {
1353                 struct ad_info ad_info;
1354                 count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0: ad_info.ports) + 1;
1355         }
1356         else
1357                 count = sprintf(buf, "\n") + 1;
1358
1359         return count;
1360 }
1361 static DEVICE_ATTR(ad_num_ports, S_IRUGO, bonding_show_ad_num_ports, NULL);
1362
1363
1364 /*
1365  * Show current 802.3ad actor key.
1366  */
1367 static ssize_t bonding_show_ad_actor_key(struct device *d,
1368                                          struct device_attribute *attr,
1369                                          char *buf)
1370 {
1371         int count = 0;
1372         struct bonding *bond = to_bond(d);
1373
1374         if (bond->params.mode == BOND_MODE_8023AD) {
1375                 struct ad_info ad_info;
1376                 count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.actor_key) + 1;
1377         }
1378         else
1379                 count = sprintf(buf, "\n") + 1;
1380
1381         return count;
1382 }
1383 static DEVICE_ATTR(ad_actor_key, S_IRUGO, bonding_show_ad_actor_key, NULL);
1384
1385
1386 /*
1387  * Show current 802.3ad partner key.
1388  */
1389 static ssize_t bonding_show_ad_partner_key(struct device *d,
1390                                            struct device_attribute *attr,
1391                                            char *buf)
1392 {
1393         int count = 0;
1394         struct bonding *bond = to_bond(d);
1395
1396         if (bond->params.mode == BOND_MODE_8023AD) {
1397                 struct ad_info ad_info;
1398                 count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.partner_key) + 1;
1399         }
1400         else
1401                 count = sprintf(buf, "\n") + 1;
1402
1403         return count;
1404 }
1405 static DEVICE_ATTR(ad_partner_key, S_IRUGO, bonding_show_ad_partner_key, NULL);
1406
1407
1408 /*
1409  * Show current 802.3ad partner mac.
1410  */
1411 static ssize_t bonding_show_ad_partner_mac(struct device *d,
1412                                            struct device_attribute *attr,
1413                                            char *buf)
1414 {
1415         int count = 0;
1416         struct bonding *bond = to_bond(d);
1417         DECLARE_MAC_BUF(mac);
1418
1419         if (bond->params.mode == BOND_MODE_8023AD) {
1420                 struct ad_info ad_info;
1421                 if (!bond_3ad_get_active_agg_info(bond, &ad_info)) {
1422                         count = sprintf(buf,"%s\n",
1423                                         print_mac(mac, ad_info.partner_system))
1424                                 + 1;
1425                 }
1426         }
1427         else
1428                 count = sprintf(buf, "\n") + 1;
1429
1430         return count;
1431 }
1432 static DEVICE_ATTR(ad_partner_mac, S_IRUGO, bonding_show_ad_partner_mac, NULL);
1433
1434
1435
1436 static struct attribute *per_bond_attrs[] = {
1437         &dev_attr_slaves.attr,
1438         &dev_attr_mode.attr,
1439         &dev_attr_fail_over_mac.attr,
1440         &dev_attr_arp_validate.attr,
1441         &dev_attr_arp_interval.attr,
1442         &dev_attr_arp_ip_target.attr,
1443         &dev_attr_downdelay.attr,
1444         &dev_attr_updelay.attr,
1445         &dev_attr_lacp_rate.attr,
1446         &dev_attr_xmit_hash_policy.attr,
1447         &dev_attr_miimon.attr,
1448         &dev_attr_primary.attr,
1449         &dev_attr_use_carrier.attr,
1450         &dev_attr_active_slave.attr,
1451         &dev_attr_mii_status.attr,
1452         &dev_attr_ad_aggregator.attr,
1453         &dev_attr_ad_num_ports.attr,
1454         &dev_attr_ad_actor_key.attr,
1455         &dev_attr_ad_partner_key.attr,
1456         &dev_attr_ad_partner_mac.attr,
1457         NULL,
1458 };
1459
1460 static struct attribute_group bonding_group = {
1461         .name = "bonding",
1462         .attrs = per_bond_attrs,
1463 };
1464
1465 /*
1466  * Initialize sysfs.  This sets up the bonding_masters file in
1467  * /sys/class/net.
1468  */
1469 int bond_create_sysfs(void)
1470 {
1471         int ret = 0;
1472         struct bonding *firstbond;
1473
1474         init_rwsem(&bonding_rwsem);
1475
1476         /* get the netdev class pointer */
1477         firstbond = container_of(bond_dev_list.next, struct bonding, bond_list);
1478         if (!firstbond)
1479                 return -ENODEV;
1480
1481         netdev_class = firstbond->dev->dev.class;
1482         if (!netdev_class)
1483                 return -ENODEV;
1484
1485         ret = class_create_file(netdev_class, &class_attr_bonding_masters);
1486         /*
1487          * Permit multiple loads of the module by ignoring failures to
1488          * create the bonding_masters sysfs file.  Bonding devices
1489          * created by second or subsequent loads of the module will
1490          * not be listed in, or controllable by, bonding_masters, but
1491          * will have the usual "bonding" sysfs directory.
1492          *
1493          * This is done to preserve backwards compatibility for
1494          * initscripts/sysconfig, which load bonding multiple times to
1495          * configure multiple bonding devices.
1496          */
1497         if (ret == -EEXIST) {
1498                 netdev_class = NULL;
1499                 return 0;
1500         }
1501
1502         return ret;
1503
1504 }
1505
1506 /*
1507  * Remove /sys/class/net/bonding_masters.
1508  */
1509 void bond_destroy_sysfs(void)
1510 {
1511         if (netdev_class)
1512                 class_remove_file(netdev_class, &class_attr_bonding_masters);
1513 }
1514
1515 /*
1516  * Initialize sysfs for each bond.  This sets up and registers
1517  * the 'bondctl' directory for each individual bond under /sys/class/net.
1518  */
1519 int bond_create_sysfs_entry(struct bonding *bond)
1520 {
1521         struct net_device *dev = bond->dev;
1522         int err;
1523
1524         err = sysfs_create_group(&(dev->dev.kobj), &bonding_group);
1525         if (err) {
1526                 printk(KERN_EMERG "eek! didn't create group!\n");
1527         }
1528
1529         if (expected_refcount < 1)
1530                 expected_refcount = atomic_read(&bond->dev->dev.kobj.kref.refcount);
1531
1532         return err;
1533 }
1534 /*
1535  * Remove sysfs entries for each bond.
1536  */
1537 void bond_destroy_sysfs_entry(struct bonding *bond)
1538 {
1539         struct net_device *dev = bond->dev;
1540
1541         sysfs_remove_group(&(dev->dev.kobj), &bonding_group);
1542 }
1543