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 #include "bonding.h"
  40
  41 #define to_dev(obj)     container_of(obj,struct device,kobj)
  42 #define to_bond(cd)     ((struct bonding *)(netdev_priv(to_net_dev(cd))))
  43
  44 /*---------------------------- Declarations -------------------------------*/
  45
  46 static int expected_refcount = -1;
  47 /*--------------------------- Data Structures -----------------------------*/
  48
  49 /* Bonding sysfs lock.  Why can't we just use the subsystem lock?
  50  * Because kobject_register tries to acquire the subsystem lock.  If
  51  * we already hold the lock (which we would if the user was creating
  52  * a new bond through the sysfs interface), we deadlock.
  53  * This lock is only needed when deleting a bond - we need to make sure
  54  * that we don't collide with an ongoing ioctl.
  55  */
  56
  57 struct rw_semaphore bonding_rwsem;
  58
  59
  60
  61
  62 /*------------------------------ Functions --------------------------------*/
  63
  64 /*
  65  * "show" function for the bond_masters attribute.
  66  * The class parameter is ignored.
  67  */
  68 static ssize_t bonding_show_bonds(struct class *cls, char *buf)
  69 {
  70         int res = 0;
  71         struct bonding *bond;
  72
  73         down_read(&(bonding_rwsem));
  74
  75         list_for_each_entry(bond, &bond_dev_list, bond_list) {
  76                 if (res > (PAGE_SIZE - IFNAMSIZ)) {
  77                         /* not enough space for another interface name */
  78                         if ((PAGE_SIZE - res) > 10)
  79                                 res = PAGE_SIZE - 10;
  80                         res += sprintf(buf + res, "++more++ ");
  81                         break;
  82                 }
  83                 res += sprintf(buf + res, "%s ", bond->dev->name);
  84         }
  85         if (res)
  86                 buf[res-1] = '\n'; /* eat the leftover space */
  87         up_read(&(bonding_rwsem));
  88         return res;
  89 }
  90
  91 /*
  92  * "store" function for the bond_masters attribute.  This is what
  93  * creates and deletes entire bonds.
  94  *
  95  * The class parameter is ignored.
  96  *
  97  */
  98
  99 static ssize_t bonding_store_bonds(struct class *cls, const char *buffer, size_t count)
 100 {
 101         char command[IFNAMSIZ + 1] = {0, };
 102         char *ifname;
 103         int rv, res = count;
 104         struct bonding *bond;
 105
 106         sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
 107         ifname = command + 1;
 108         if ((strlen(command) <= 1) ||
 109             !dev_valid_name(ifname))
 110                 goto err_no_cmd;
 111
 112         if (command[0] == '+') {
 113                 printk(KERN_INFO DRV_NAME
 114                         ": %s is being created...\n", ifname);
 115                 rv = bond_create(ifname, &bonding_defaults);
 116                 if (rv) {
 117                         printk(KERN_INFO DRV_NAME ": Bond creation failed.\n");
 118                         res = rv;
 119                 }
 120                 goto out;
 121         }
 122
 123         if (command[0] == '-') {
 124                 rtnl_lock();
 125                 down_write(&bonding_rwsem);
 126
 127                 list_for_each_entry(bond, &bond_dev_list, bond_list)
 128                         if (strnicmp(bond->dev->name, ifname, IFNAMSIZ) == 0) {
 129                                 /* check the ref count on the bond's kobject.
 130                                  * If it's > expected, then there's a file open,
 131                                  * and we have to fail.
 132                                  */
 133                                 if (atomic_read(&bond->dev->dev.kobj.kref.refcount)
 134                                                         > expected_refcount){
 135                                         printk(KERN_INFO DRV_NAME
 136                                                 ": Unable remove bond %s due to open references.\n",
 137                                                 ifname);
 138                                         res = -EPERM;
 139                                         goto out_unlock;
 140                                 }
 141                                 printk(KERN_INFO DRV_NAME
 142                                         ": %s is being deleted...\n",
 143                                         bond->dev->name);
 144                                 bond_destroy(bond);
 145                                 goto out_unlock;
 146                         }
 147
 148                 printk(KERN_ERR DRV_NAME
 149                         ": unable to delete non-existent bond %s\n", ifname);
 150                 res = -ENODEV;
 151                 goto out_unlock;
 152         }
 153
 154 err_no_cmd:
 155         printk(KERN_ERR DRV_NAME
 156                 ": no command found in bonding_masters. Use +ifname or -ifname.\n");
 157         return -EPERM;
 158
 159 out_unlock:
 160         up_write(&bonding_rwsem);
 161         rtnl_unlock();
 162
 163         /* Always return either count or an error.  If you return 0, you'll
 164          * get called forever, which is bad.
 165          */
 166 out:
 167         return res;
 168 }
 169 /* class attribute for bond_masters file.  This ends up in /sys/class/net */
 170 static CLASS_ATTR(bonding_masters,  S_IWUSR | S_IRUGO,
 171                   bonding_show_bonds, bonding_store_bonds);
 172
 173 int bond_create_slave_symlinks(struct net_device *master, struct net_device *slave)
 174 {
 175         char linkname[IFNAMSIZ+7];
 176         int ret = 0;
 177
 178         /* first, create a link from the slave back to the master */
 179         ret = sysfs_create_link(&(slave->dev.kobj), &(master->dev.kobj),
 180                                 "master");
 181         if (ret)
 182                 return ret;
 183         /* next, create a link from the master to the slave */
 184         sprintf(linkname,"slave_%s",slave->name);
 185         ret = sysfs_create_link(&(master->dev.kobj), &(slave->dev.kobj),
 186                                 linkname);
 187         return ret;
 188
 189 }
 190
 191 void bond_destroy_slave_symlinks(struct net_device *master, struct net_device *slave)
 192 {
 193         char linkname[IFNAMSIZ+7];
 194
 195         sysfs_remove_link(&(slave->dev.kobj), "master");
 196         sprintf(linkname,"slave_%s",slave->name);
 197         sysfs_remove_link(&(master->dev.kobj), linkname);
 198 }
 199
 200
 201 /*
 202  * Show the slaves in the current bond.
 203  */
 204 static ssize_t bonding_show_slaves(struct device *d,
 205                                    struct device_attribute *attr, char *buf)
 206 {
 207         struct slave *slave;
 208         int i, res = 0;
 209         struct bonding *bond = to_bond(d);
 210
 211         read_lock(&bond->lock);
 212         bond_for_each_slave(bond, slave, i) {
 213                 if (res > (PAGE_SIZE - IFNAMSIZ)) {
 214                         /* not enough space for another interface name */
 215                         if ((PAGE_SIZE - res) > 10)
 216                                 res = PAGE_SIZE - 10;
 217                         res += sprintf(buf + res, "++more++ ");
 218                         break;
 219                 }
 220                 res += sprintf(buf + res, "%s ", slave->dev->name);
 221         }
 222         read_unlock(&bond->lock);
 223         if (res)
 224                 buf[res-1] = '\n'; /* eat the leftover space */
 225         return res;
 226 }
 227
 228 /*
 229  * Set the slaves in the current bond.  The bond interface must be
 230  * up for this to succeed.
 231  * This function is largely the same flow as bonding_update_bonds().
 232  */
 233 static ssize_t bonding_store_slaves(struct device *d,
 234                                     struct device_attribute *attr,
 235                                     const char *buffer, size_t count)
 236 {
 237         char command[IFNAMSIZ + 1] = { 0, };
 238         char *ifname;
 239         int i, res, found, ret = count;
 240         u32 original_mtu;
 241         struct slave *slave;
 242         struct net_device *dev = NULL;
 243         struct bonding *bond = to_bond(d);
 244
 245         /* Quick sanity check -- is the bond interface up? */
 246         if (!(bond->dev->flags & IFF_UP)) {
 247                 printk(KERN_WARNING DRV_NAME
 248                        ": %s: doing slave updates when interface is down.\n",
 249                        bond->dev->name);
 250         }
 251
 252         /* Note:  We can't hold bond->lock here, as bond_create grabs it. */
 253
 254         rtnl_lock();
 255         down_write(&(bonding_rwsem));
 256
 257         sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
 258         ifname = command + 1;
 259         if ((strlen(command) <= 1) ||
 260             !dev_valid_name(ifname))
 261                 goto err_no_cmd;
 262
 263         if (command[0] == '+') {
 264
 265                 /* Got a slave name in ifname.  Is it already in the list? */
 266                 found = 0;
 267                 read_lock(&bond->lock);
 268                 bond_for_each_slave(bond, slave, i)
 269                         if (strnicmp(slave->dev->name, ifname, IFNAMSIZ) == 0) {
 270                                 printk(KERN_ERR DRV_NAME
 271                                        ": %s: Interface %s is already enslaved!\n",
 272                                        bond->dev->name, ifname);
 273                                 ret = -EPERM;
 274                                 read_unlock(&bond->lock);
 275                                 goto out;
 276                         }
 277
 278                 read_unlock(&bond->lock);
 279                 printk(KERN_INFO DRV_NAME ": %s: Adding slave %s.\n",
 280                        bond->dev->name, ifname);
 281                 dev = dev_get_by_name(&init_net, ifname);
 282                 if (!dev) {
 283                         printk(KERN_INFO DRV_NAME
 284                                ": %s: Interface %s does not exist!\n",
 285                                bond->dev->name, ifname);
 286                         ret = -EPERM;
 287                         goto out;
 288                 }
 289                 else
 290                         dev_put(dev);
 291
 292                 if (dev->flags & IFF_UP) {
 293                         printk(KERN_ERR DRV_NAME
 294                                ": %s: Error: Unable to enslave %s "
 295                                "because it is already up.\n",
 296                                bond->dev->name, dev->name);
 297                         ret = -EPERM;
 298                         goto out;
 299                 }
 300                 /* If this is the first slave, then we need to set
 301                    the master's hardware address to be the same as the
 302                    slave's. */
 303                 if (!(*((u32 *) & (bond->dev->dev_addr[0])))) {
 304                         memcpy(bond->dev->dev_addr, dev->dev_addr,
 305                                dev->addr_len);
 306                 }
 307
 308                 /* Set the slave's MTU to match the bond */
 309                 original_mtu = dev->mtu;
 310                 res = dev_set_mtu(dev, bond->dev->mtu);
 311                 if (res) {
 312                         ret = res;
 313                         goto out;
 314                 }
 315
 316                 res = bond_enslave(bond->dev, dev);
 317                 bond_for_each_slave(bond, slave, i)
 318                         if (strnicmp(slave->dev->name, ifname, IFNAMSIZ) == 0)
 319                                 slave->original_mtu = original_mtu;
 320                 if (res) {
 321                         ret = res;
 322                 }
 323                 goto out;
 324         }
 325
 326         if (command[0] == '-') {
 327                 dev = NULL;
 328                 original_mtu = 0;
 329                 bond_for_each_slave(bond, slave, i)
 330                         if (strnicmp(slave->dev->name, ifname, IFNAMSIZ) == 0) {
 331                                 dev = slave->dev;
 332                                 original_mtu = slave->original_mtu;
 333                                 break;
 334                         }
 335                 if (dev) {
 336                         printk(KERN_INFO DRV_NAME ": %s: Removing slave %s\n",
 337                                 bond->dev->name, dev->name);
 338                                 res = bond_release(bond->dev, dev);
 339                         if (res) {
 340                                 ret = res;
 341                                 goto out;
 342                         }
 343                         /* set the slave MTU to the default */
 344                         dev_set_mtu(dev, original_mtu);
 345                 }
 346                 else {
 347                         printk(KERN_ERR DRV_NAME ": unable to remove non-existent slave %s for bond %s.\n",
 348                                 ifname, bond->dev->name);
 349                         ret = -ENODEV;
 350                 }
 351                 goto out;
 352         }
 353
 354 err_no_cmd:
 355         printk(KERN_ERR DRV_NAME ": no command found in slaves file for bond %s. Use +ifname or -ifname.\n", bond->dev->name);
 356         ret = -EPERM;
 357
 358 out:
 359         up_write(&(bonding_rwsem));
 360         rtnl_unlock();
 361         return ret;
 362 }
 363
 364 static DEVICE_ATTR(slaves, S_IRUGO | S_IWUSR, bonding_show_slaves, bonding_store_slaves);
 365
 366 /*
 367  * Show and set the bonding mode.  The bond interface must be down to
 368  * change the mode.
 369  */
 370 static ssize_t bonding_show_mode(struct device *d,
 371                                  struct device_attribute *attr, char *buf)
 372 {
 373         struct bonding *bond = to_bond(d);
 374
 375         return sprintf(buf, "%s %d\n",
 376                         bond_mode_tbl[bond->params.mode].modename,
 377                         bond->params.mode);
 378 }
 379
 380 static ssize_t bonding_store_mode(struct device *d,
 381                                   struct device_attribute *attr,
 382                                   const char *buf, size_t count)
 383 {
 384         int new_value, ret = count;
 385         struct bonding *bond = to_bond(d);
 386
 387         if (bond->dev->flags & IFF_UP) {
 388                 printk(KERN_ERR DRV_NAME
 389                        ": unable to update mode of %s because interface is up.\n",
 390                        bond->dev->name);
 391                 ret = -EPERM;
 392                 goto out;
 393         }
 394
 395         new_value = bond_parse_parm(buf, bond_mode_tbl);
 396         if (new_value < 0)  {
 397                 printk(KERN_ERR DRV_NAME
 398                        ": %s: Ignoring invalid mode value %.*s.\n",
 399                        bond->dev->name,
 400                        (int)strlen(buf) - 1, buf);
 401                 ret = -EINVAL;
 402                 goto out;
 403         } else {
 404                 if (bond->params.mode == BOND_MODE_8023AD)
 405                         bond_unset_master_3ad_flags(bond);
 406
 407                 if (bond->params.mode == BOND_MODE_ALB)
 408                         bond_unset_master_alb_flags(bond);
 409
 410                 bond->params.mode = new_value;
 411                 bond_set_mode_ops(bond, bond->params.mode);
 412                 printk(KERN_INFO DRV_NAME ": %s: setting mode to %s (%d).\n",
 413                         bond->dev->name, bond_mode_tbl[new_value].modename, new_value);
 414         }
 415 out:
 416         return ret;
 417 }
 418 static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR, bonding_show_mode, bonding_store_mode);
 419
 420 /*
 421  * Show and set the bonding transmit hash method.  The bond interface must be down to
 422  * change the xmit hash policy.
 423  */
 424 static ssize_t bonding_show_xmit_hash(struct device *d,
 425                                       struct device_attribute *attr,
 426                                       char *buf)
 427 {
 428         struct bonding *bond = to_bond(d);
 429
 430         return sprintf(buf, "%s %d\n",
 431                        xmit_hashtype_tbl[bond->params.xmit_policy].modename,
 432                        bond->params.xmit_policy);
 433 }
 434
 435 static ssize_t bonding_store_xmit_hash(struct device *d,
 436                                        struct device_attribute *attr,
 437                                        const char *buf, size_t count)
 438 {
 439         int new_value, ret = count;
 440         struct bonding *bond = to_bond(d);
 441
 442         if (bond->dev->flags & IFF_UP) {
 443                 printk(KERN_ERR DRV_NAME
 444                        "%s: Interface is up. Unable to update xmit policy.\n",
 445                        bond->dev->name);
 446                 ret = -EPERM;
 447                 goto out;
 448         }
 449
 450         new_value = bond_parse_parm(buf, xmit_hashtype_tbl);
 451         if (new_value < 0)  {
 452                 printk(KERN_ERR DRV_NAME
 453                        ": %s: Ignoring invalid xmit hash policy value %.*s.\n",
 454                        bond->dev->name,
 455                        (int)strlen(buf) - 1, buf);
 456                 ret = -EINVAL;
 457                 goto out;
 458         } else {
 459                 bond->params.xmit_policy = new_value;
 460                 bond_set_mode_ops(bond, bond->params.mode);
 461                 printk(KERN_INFO DRV_NAME ": %s: setting xmit hash policy to %s (%d).\n",
 462                         bond->dev->name, xmit_hashtype_tbl[new_value].modename, new_value);
 463         }
 464 out:
 465         return ret;
 466 }
 467 static DEVICE_ATTR(xmit_hash_policy, S_IRUGO | S_IWUSR, bonding_show_xmit_hash, bonding_store_xmit_hash);
 468
 469 /*
 470  * Show and set arp_validate.
 471  */
 472 static ssize_t bonding_show_arp_validate(struct device *d,
 473                                          struct device_attribute *attr,
 474                                          char *buf)
 475 {
 476         struct bonding *bond = to_bond(d);
 477
 478         return sprintf(buf, "%s %d\n",
 479                        arp_validate_tbl[bond->params.arp_validate].modename,
 480                        bond->params.arp_validate);
 481 }
 482
 483 static ssize_t bonding_store_arp_validate(struct device *d,
 484                                           struct device_attribute *attr,
 485                                           const char *buf, size_t count)
 486 {
 487         int new_value;
 488         struct bonding *bond = to_bond(d);
 489
 490         new_value = bond_parse_parm(buf, arp_validate_tbl);
 491         if (new_value < 0) {
 492                 printk(KERN_ERR DRV_NAME
 493                        ": %s: Ignoring invalid arp_validate value %s\n",
 494                        bond->dev->name, buf);
 495                 return -EINVAL;
 496         }
 497         if (new_value && (bond->params.mode != BOND_MODE_ACTIVEBACKUP)) {
 498                 printk(KERN_ERR DRV_NAME
 499                        ": %s: arp_validate only supported in active-backup mode.\n",
 500                        bond->dev->name);
 501                 return -EINVAL;
 502         }
 503         printk(KERN_INFO DRV_NAME ": %s: setting arp_validate to %s (%d).\n",
 504                bond->dev->name, arp_validate_tbl[new_value].modename,
 505                new_value);
 506
 507         if (!bond->params.arp_validate && new_value) {
 508                 bond_register_arp(bond);
 509         } else if (bond->params.arp_validate && !new_value) {
 510                 bond_unregister_arp(bond);
 511         }
 512
 513         bond->params.arp_validate = new_value;
 514
 515         return count;
 516 }
 517
 518 static DEVICE_ATTR(arp_validate, S_IRUGO | S_IWUSR, bonding_show_arp_validate, bonding_store_arp_validate);
 519
 520 /*
 521  * Show and store fail_over_mac.  User only allowed to change the
 522  * value when there are no slaves.
 523  */
 524 static ssize_t bonding_show_fail_over_mac(struct device *d, struct device_attribute *attr, char *buf)
 525 {
 526         struct bonding *bond = to_bond(d);
 527
 528         return sprintf(buf, "%s %d\n",
 529                        fail_over_mac_tbl[bond->params.fail_over_mac].modename,
 530                        bond->params.fail_over_mac);
 531 }
 532
 533 static ssize_t bonding_store_fail_over_mac(struct device *d, struct device_attribute *attr, const char *buf, size_t count)
 534 {
 535         int new_value;
 536         struct bonding *bond = to_bond(d);
 537
 538         if (bond->slave_cnt != 0) {
 539                 printk(KERN_ERR DRV_NAME
 540                        ": %s: Can't alter fail_over_mac with slaves in bond.\n",
 541                        bond->dev->name);
 542                 return -EPERM;
 543         }
 544
 545         new_value = bond_parse_parm(buf, fail_over_mac_tbl);
 546         if (new_value < 0) {
 547                 printk(KERN_ERR DRV_NAME
 548                        ": %s: Ignoring invalid fail_over_mac value %s.\n",
 549                        bond->dev->name, buf);
 550                 return -EINVAL;
 551         }
 552
 553         bond->params.fail_over_mac = new_value;
 554         printk(KERN_INFO DRV_NAME ": %s: Setting fail_over_mac to %s (%d).\n",
 555                bond->dev->name, fail_over_mac_tbl[new_value].modename,
 556                new_value);
 557
 558         return count;
 559 }
 560
 561 static DEVICE_ATTR(fail_over_mac, S_IRUGO | S_IWUSR, bonding_show_fail_over_mac, bonding_store_fail_over_mac);
 562
 563 /*
 564  * Show and set the arp timer interval.  There are two tricky bits
 565  * here.  First, if ARP monitoring is activated, then we must disable
 566  * MII monitoring.  Second, if the ARP timer isn't running, we must
 567  * start it.
 568  */
 569 static ssize_t bonding_show_arp_interval(struct device *d,
 570                                          struct device_attribute *attr,
 571                                          char *buf)
 572 {
 573         struct bonding *bond = to_bond(d);
 574
 575         return sprintf(buf, "%d\n", bond->params.arp_interval);
 576 }
 577
 578 static ssize_t bonding_store_arp_interval(struct device *d,
 579                                           struct device_attribute *attr,
 580                                           const char *buf, size_t count)
 581 {
 582         int new_value, ret = count;
 583         struct bonding *bond = to_bond(d);
 584
 585         if (sscanf(buf, "%d", &new_value) != 1) {
 586                 printk(KERN_ERR DRV_NAME
 587                        ": %s: no arp_interval value specified.\n",
 588                        bond->dev->name);
 589                 ret = -EINVAL;
 590                 goto out;
 591         }
 592         if (new_value < 0) {
 593                 printk(KERN_ERR DRV_NAME
 594                        ": %s: Invalid arp_interval value %d not in range 1-%d; rejected.\n",
 595                        bond->dev->name, new_value, INT_MAX);
 596                 ret = -EINVAL;
 597                 goto out;
 598         }
 599
 600         printk(KERN_INFO DRV_NAME
 601                ": %s: Setting ARP monitoring interval to %d.\n",
 602                bond->dev->name, new_value);
 603         bond->params.arp_interval = new_value;
 604         if (bond->params.arp_interval)
 605                 bond->dev->priv_flags |= IFF_MASTER_ARPMON;
 606         if (bond->params.miimon) {
 607                 printk(KERN_INFO DRV_NAME
 608                        ": %s: ARP monitoring cannot be used with MII monitoring. "
 609                        "%s Disabling MII monitoring.\n",
 610                        bond->dev->name, bond->dev->name);
 611                 bond->params.miimon = 0;
 612                 if (delayed_work_pending(&bond->mii_work)) {
 613                         cancel_delayed_work(&bond->mii_work);
 614                         flush_workqueue(bond->wq);
 615                 }
 616         }
 617         if (!bond->params.arp_targets[0]) {
 618                 printk(KERN_INFO DRV_NAME
 619                        ": %s: ARP monitoring has been set up, "
 620                        "but no ARP targets have been specified.\n",
 621                        bond->dev->name);
 622         }
 623         if (bond->dev->flags & IFF_UP) {
 624                 /* If the interface is up, we may need to fire off
 625                  * the ARP timer.  If the interface is down, the
 626                  * timer will get fired off when the open function
 627                  * is called.
 628                  */
 629                 if (!delayed_work_pending(&bond->arp_work)) {
 630                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
 631                                 INIT_DELAYED_WORK(&bond->arp_work,
 632                                                   bond_activebackup_arp_mon);
 633                         else
 634                                 INIT_DELAYED_WORK(&bond->arp_work,
 635                                                   bond_loadbalance_arp_mon);
 636
 637                         queue_delayed_work(bond->wq, &bond->arp_work, 0);
 638                 }
 639         }
 640
 641 out:
 642         return ret;
 643 }
 644 static DEVICE_ATTR(arp_interval, S_IRUGO | S_IWUSR , bonding_show_arp_interval, bonding_store_arp_interval);
 645
 646 /*
 647  * Show and set the arp targets.
 648  */
 649 static ssize_t bonding_show_arp_targets(struct device *d,
 650                                         struct device_attribute *attr,
 651                                         char *buf)
 652 {
 653         int i, res = 0;
 654         struct bonding *bond = to_bond(d);
 655
 656         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) {
 657                 if (bond->params.arp_targets[i])
 658                         res += sprintf(buf + res, "%pI4 ",
 659                                        &bond->params.arp_targets[i]);
 660         }
 661         if (res)
 662                 buf[res-1] = '\n'; /* eat the leftover space */
 663         return res;
 664 }
 665
 666 static ssize_t bonding_store_arp_targets(struct device *d,
 667                                          struct device_attribute *attr,
 668                                          const char *buf, size_t count)
 669 {
 670         __be32 newtarget;
 671         int i = 0, done = 0, ret = count;
 672         struct bonding *bond = to_bond(d);
 673         __be32 *targets;
 674
 675         targets = bond->params.arp_targets;
 676         newtarget = in_aton(buf + 1);
 677         /* look for adds */
 678         if (buf[0] == '+') {
 679                 if ((newtarget == 0) || (newtarget == htonl(INADDR_BROADCAST))) {
 680                         printk(KERN_ERR DRV_NAME
 681                                ": %s: invalid ARP target %pI4 specified for addition\n",
 682                                bond->dev->name, &newtarget);
 683                         ret = -EINVAL;
 684                         goto out;
 685                 }
 686                 /* look for an empty slot to put the target in, and check for dupes */
 687                 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
 688                         if (targets[i] == newtarget) { /* duplicate */
 689                                 printk(KERN_ERR DRV_NAME
 690                                        ": %s: ARP target %pI4 is already present\n",
 691                                        bond->dev->name, &newtarget);
 692                                 if (done)
 693                                         targets[i] = 0;
 694                                 ret = -EINVAL;
 695                                 goto out;
 696                         }
 697                         if (targets[i] == 0 && !done) {
 698                                 printk(KERN_INFO DRV_NAME
 699                                        ": %s: adding ARP target %pI4.\n",
 700                                        bond->dev->name, &newtarget);
 701                                 done = 1;
 702                                 targets[i] = newtarget;
 703                         }
 704                 }
 705                 if (!done) {
 706                         printk(KERN_ERR DRV_NAME
 707                                ": %s: ARP target table is full!\n",
 708                                bond->dev->name);
 709                         ret = -EINVAL;
 710                         goto out;
 711                 }
 712
 713         }
 714         else if (buf[0] == '-') {
 715                 if ((newtarget == 0) || (newtarget == htonl(INADDR_BROADCAST))) {
 716                         printk(KERN_ERR DRV_NAME
 717                                ": %s: invalid ARP target %pI4 specified for removal\n",
 718                                bond->dev->name, &newtarget);
 719                         ret = -EINVAL;
 720                         goto out;
 721                 }
 722
 723                 for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
 724                         if (targets[i] == newtarget) {
 725                                 printk(KERN_INFO DRV_NAME
 726                                        ": %s: removing ARP target %pI4.\n",
 727                                        bond->dev->name, &newtarget);
 728                                 targets[i] = 0;
 729                                 done = 1;
 730                         }
 731                 }
 732                 if (!done) {
 733                         printk(KERN_INFO DRV_NAME
 734                                ": %s: unable to remove nonexistent ARP target %pI4.\n",
 735                                bond->dev->name, &newtarget);
 736                         ret = -EINVAL;
 737                         goto out;
 738                 }
 739         }
 740         else {
 741                 printk(KERN_ERR DRV_NAME ": no command found in arp_ip_targets file for bond %s. Use +<addr> or -<addr>.\n",
 742                         bond->dev->name);
 743                 ret = -EPERM;
 744                 goto out;
 745         }
 746
 747 out:
 748         return ret;
 749 }
 750 static DEVICE_ATTR(arp_ip_target, S_IRUGO | S_IWUSR , bonding_show_arp_targets, bonding_store_arp_targets);
 751
 752 /*
 753  * Show and set the up and down delays.  These must be multiples of the
 754  * MII monitoring value, and are stored internally as the multiplier.
 755  * Thus, we must translate to MS for the real world.
 756  */
 757 static ssize_t bonding_show_downdelay(struct device *d,
 758                                       struct device_attribute *attr,
 759                                       char *buf)
 760 {
 761         struct bonding *bond = to_bond(d);
 762
 763         return sprintf(buf, "%d\n", bond->params.downdelay * bond->params.miimon);
 764 }
 765
 766 static ssize_t bonding_store_downdelay(struct device *d,
 767                                        struct device_attribute *attr,
 768                                        const char *buf, size_t count)
 769 {
 770         int new_value, ret = count;
 771         struct bonding *bond = to_bond(d);
 772
 773         if (!(bond->params.miimon)) {
 774                 printk(KERN_ERR DRV_NAME
 775                        ": %s: Unable to set down delay as MII monitoring is disabled\n",
 776                        bond->dev->name);
 777                 ret = -EPERM;
 778                 goto out;
 779         }
 780
 781         if (sscanf(buf, "%d", &new_value) != 1) {
 782                 printk(KERN_ERR DRV_NAME
 783                        ": %s: no down delay value specified.\n",
 784                        bond->dev->name);
 785                 ret = -EINVAL;
 786                 goto out;
 787         }
 788         if (new_value < 0) {
 789                 printk(KERN_ERR DRV_NAME
 790                        ": %s: Invalid down delay value %d not in range %d-%d; rejected.\n",
 791                        bond->dev->name, new_value, 1, INT_MAX);
 792                 ret = -EINVAL;
 793                 goto out;
 794         } else {
 795                 if ((new_value % bond->params.miimon) != 0) {
 796                         printk(KERN_WARNING DRV_NAME
 797                                ": %s: Warning: down delay (%d) is not a multiple "
 798                                "of miimon (%d), delay rounded to %d ms\n",
 799                                bond->dev->name, new_value, bond->params.miimon,
 800                                (new_value / bond->params.miimon) *
 801                                bond->params.miimon);
 802                 }
 803                 bond->params.downdelay = new_value / bond->params.miimon;
 804                 printk(KERN_INFO DRV_NAME ": %s: Setting down delay to %d.\n",
 805                        bond->dev->name, bond->params.downdelay * bond->params.miimon);
 806
 807         }
 808
 809 out:
 810         return ret;
 811 }
 812 static DEVICE_ATTR(downdelay, S_IRUGO | S_IWUSR , bonding_show_downdelay, bonding_store_downdelay);
 813
 814 static ssize_t bonding_show_updelay(struct device *d,
 815                                     struct device_attribute *attr,
 816                                     char *buf)
 817 {
 818         struct bonding *bond = to_bond(d);
 819
 820         return sprintf(buf, "%d\n", bond->params.updelay * bond->params.miimon);
 821
 822 }
 823
 824 static ssize_t bonding_store_updelay(struct device *d,
 825                                      struct device_attribute *attr,
 826                                      const char *buf, size_t count)
 827 {
 828         int new_value, ret = count;
 829         struct bonding *bond = to_bond(d);
 830
 831         if (!(bond->params.miimon)) {
 832                 printk(KERN_ERR DRV_NAME
 833                        ": %s: Unable to set up delay as MII monitoring is disabled\n",
 834                        bond->dev->name);
 835                 ret = -EPERM;
 836                 goto out;
 837         }
 838
 839         if (sscanf(buf, "%d", &new_value) != 1) {
 840                 printk(KERN_ERR DRV_NAME
 841                        ": %s: no up delay value specified.\n",
 842                        bond->dev->name);
 843                 ret = -EINVAL;
 844                 goto out;
 845         }
 846         if (new_value < 0) {
 847                 printk(KERN_ERR DRV_NAME
 848                        ": %s: Invalid down delay value %d not in range %d-%d; rejected.\n",
 849                        bond->dev->name, new_value, 1, INT_MAX);
 850                 ret = -EINVAL;
 851                 goto out;
 852         } else {
 853                 if ((new_value % bond->params.miimon) != 0) {
 854                         printk(KERN_WARNING DRV_NAME
 855                                ": %s: Warning: up delay (%d) is not a multiple "
 856                                "of miimon (%d), updelay rounded to %d ms\n",
 857                                bond->dev->name, new_value, bond->params.miimon,
 858                                (new_value / bond->params.miimon) *
 859                                bond->params.miimon);
 860                 }
 861                 bond->params.updelay = new_value / bond->params.miimon;
 862                 printk(KERN_INFO DRV_NAME ": %s: Setting up delay to %d.\n",
 863                        bond->dev->name, bond->params.updelay * bond->params.miimon);
 864
 865         }
 866
 867 out:
 868         return ret;
 869 }
 870 static DEVICE_ATTR(updelay, S_IRUGO | S_IWUSR , bonding_show_updelay, bonding_store_updelay);
 871
 872 /*
 873  * Show and set the LACP interval.  Interface must be down, and the mode
 874  * must be set to 802.3ad mode.
 875  */
 876 static ssize_t bonding_show_lacp(struct device *d,
 877                                  struct device_attribute *attr,
 878                                  char *buf)
 879 {
 880         struct bonding *bond = to_bond(d);
 881
 882         return sprintf(buf, "%s %d\n",
 883                 bond_lacp_tbl[bond->params.lacp_fast].modename,
 884                 bond->params.lacp_fast);
 885 }
 886
 887 static ssize_t bonding_store_lacp(struct device *d,
 888                                   struct device_attribute *attr,
 889                                   const char *buf, size_t count)
 890 {
 891         int new_value, ret = count;
 892         struct bonding *bond = to_bond(d);
 893
 894         if (bond->dev->flags & IFF_UP) {
 895                 printk(KERN_ERR DRV_NAME
 896                        ": %s: Unable to update LACP rate because interface is up.\n",
 897                        bond->dev->name);
 898                 ret = -EPERM;
 899                 goto out;
 900         }
 901
 902         if (bond->params.mode != BOND_MODE_8023AD) {
 903                 printk(KERN_ERR DRV_NAME
 904                        ": %s: Unable to update LACP rate because bond is not in 802.3ad mode.\n",
 905                        bond->dev->name);
 906                 ret = -EPERM;
 907                 goto out;
 908         }
 909
 910         new_value = bond_parse_parm(buf, bond_lacp_tbl);
 911
 912         if ((new_value == 1) || (new_value == 0)) {
 913                 bond->params.lacp_fast = new_value;
 914                 printk(KERN_INFO DRV_NAME
 915                        ": %s: Setting LACP rate to %s (%d).\n",
 916                        bond->dev->name, bond_lacp_tbl[new_value].modename, new_value);
 917         } else {
 918                 printk(KERN_ERR DRV_NAME
 919                        ": %s: Ignoring invalid LACP rate value %.*s.\n",
 920                         bond->dev->name, (int)strlen(buf) - 1, buf);
 921                 ret = -EINVAL;
 922         }
 923 out:
 924         return ret;
 925 }
 926 static DEVICE_ATTR(lacp_rate, S_IRUGO | S_IWUSR, bonding_show_lacp, bonding_store_lacp);
 927
 928 static ssize_t bonding_show_ad_select(struct device *d,
 929                                       struct device_attribute *attr,
 930                                       char *buf)
 931 {
 932         struct bonding *bond = to_bond(d);
 933
 934         return sprintf(buf, "%s %d\n",
 935                 ad_select_tbl[bond->params.ad_select].modename,
 936                 bond->params.ad_select);
 937 }
 938
 939
 940 static ssize_t bonding_store_ad_select(struct device *d,
 941                                        struct device_attribute *attr,
 942                                        const char *buf, size_t count)
 943 {
 944         int new_value, ret = count;
 945         struct bonding *bond = to_bond(d);
 946
 947         if (bond->dev->flags & IFF_UP) {
 948                 printk(KERN_ERR DRV_NAME
 949                        ": %s: Unable to update ad_select because interface "
 950                        "is up.\n", bond->dev->name);
 951                 ret = -EPERM;
 952                 goto out;
 953         }
 954
 955         new_value = bond_parse_parm(buf, ad_select_tbl);
 956
 957         if (new_value != -1) {
 958                 bond->params.ad_select = new_value;
 959                 printk(KERN_INFO DRV_NAME
 960                        ": %s: Setting ad_select to %s (%d).\n",
 961                        bond->dev->name, ad_select_tbl[new_value].modename,
 962                        new_value);
 963         } else {
 964                 printk(KERN_ERR DRV_NAME
 965                        ": %s: Ignoring invalid ad_select value %.*s.\n",
 966                        bond->dev->name, (int)strlen(buf) - 1, buf);
 967                 ret = -EINVAL;
 968         }
 969 out:
 970         return ret;
 971 }
 972
 973 static DEVICE_ATTR(ad_select, S_IRUGO | S_IWUSR, bonding_show_ad_select, bonding_store_ad_select);
 974
 975 /*
 976  * Show and set the number of grat ARP to send after a failover event.
 977  */
 978 static ssize_t bonding_show_n_grat_arp(struct device *d,
 979                                    struct device_attribute *attr,
 980                                    char *buf)
 981 {
 982         struct bonding *bond = to_bond(d);
 983
 984         return sprintf(buf, "%d\n", bond->params.num_grat_arp);
 985 }
 986
 987 static ssize_t bonding_store_n_grat_arp(struct device *d,
 988                                     struct device_attribute *attr,
 989                                     const char *buf, size_t count)
 990 {
 991         int new_value, ret = count;
 992         struct bonding *bond = to_bond(d);
 993
 994         if (sscanf(buf, "%d", &new_value) != 1) {
 995                 printk(KERN_ERR DRV_NAME
 996                        ": %s: no num_grat_arp value specified.\n",
 997                        bond->dev->name);
 998                 ret = -EINVAL;
 999                 goto out;
1000         }
1001         if (new_value < 0 || new_value > 255) {
1002                 printk(KERN_ERR DRV_NAME
1003                        ": %s: Invalid num_grat_arp value %d not in range 0-255; rejected.\n",
1004                        bond->dev->name, new_value);
1005                 ret = -EINVAL;
1006                 goto out;
1007         } else {
1008                 bond->params.num_grat_arp = new_value;
1009         }
1010 out:
1011         return ret;
1012 }
1013 static DEVICE_ATTR(num_grat_arp, S_IRUGO | S_IWUSR, bonding_show_n_grat_arp, bonding_store_n_grat_arp);
1014
1015 /*
1016  * Show and set the number of unsolicted NA's to send after a failover event.
1017  */
1018 static ssize_t bonding_show_n_unsol_na(struct device *d,
1019                                        struct device_attribute *attr,
1020                                        char *buf)
1021 {
1022         struct bonding *bond = to_bond(d);
1023
1024         return sprintf(buf, "%d\n", bond->params.num_unsol_na);
1025 }
1026
1027 static ssize_t bonding_store_n_unsol_na(struct device *d,
1028                                         struct device_attribute *attr,
1029                                         const char *buf, size_t count)
1030 {
1031         int new_value, ret = count;
1032         struct bonding *bond = to_bond(d);
1033
1034         if (sscanf(buf, "%d", &new_value) != 1) {
1035                 printk(KERN_ERR DRV_NAME
1036                        ": %s: no num_unsol_na value specified.\n",
1037                        bond->dev->name);
1038                 ret = -EINVAL;
1039                 goto out;
1040         }
1041         if (new_value < 0 || new_value > 255) {
1042                 printk(KERN_ERR DRV_NAME
1043                        ": %s: Invalid num_unsol_na value %d not in range 0-255; rejected.\n",
1044                        bond->dev->name, new_value);
1045                 ret = -EINVAL;
1046                 goto out;
1047         } else {
1048                 bond->params.num_unsol_na = new_value;
1049         }
1050 out:
1051         return ret;
1052 }
1053 static DEVICE_ATTR(num_unsol_na, S_IRUGO | S_IWUSR, bonding_show_n_unsol_na, bonding_store_n_unsol_na);
1054
1055 /*
1056  * Show and set the MII monitor interval.  There are two tricky bits
1057  * here.  First, if MII monitoring is activated, then we must disable
1058  * ARP monitoring.  Second, if the timer isn't running, we must
1059  * start it.
1060  */
1061 static ssize_t bonding_show_miimon(struct device *d,
1062                                    struct device_attribute *attr,
1063                                    char *buf)
1064 {
1065         struct bonding *bond = to_bond(d);
1066
1067         return sprintf(buf, "%d\n", bond->params.miimon);
1068 }
1069
1070 static ssize_t bonding_store_miimon(struct device *d,
1071                                     struct device_attribute *attr,
1072                                     const char *buf, size_t count)
1073 {
1074         int new_value, ret = count;
1075         struct bonding *bond = to_bond(d);
1076
1077         if (sscanf(buf, "%d", &new_value) != 1) {
1078                 printk(KERN_ERR DRV_NAME
1079                        ": %s: no miimon value specified.\n",
1080                        bond->dev->name);
1081                 ret = -EINVAL;
1082                 goto out;
1083         }
1084         if (new_value < 0) {
1085                 printk(KERN_ERR DRV_NAME
1086                        ": %s: Invalid miimon value %d not in range %d-%d; rejected.\n",
1087                        bond->dev->name, new_value, 1, INT_MAX);
1088                 ret = -EINVAL;
1089                 goto out;
1090         } else {
1091                 printk(KERN_INFO DRV_NAME
1092                        ": %s: Setting MII monitoring interval to %d.\n",
1093                        bond->dev->name, new_value);
1094                 bond->params.miimon = new_value;
1095                 if(bond->params.updelay)
1096                         printk(KERN_INFO DRV_NAME
1097                               ": %s: Note: Updating updelay (to %d) "
1098                               "since it is a multiple of the miimon value.\n",
1099                               bond->dev->name,
1100                               bond->params.updelay * bond->params.miimon);
1101                 if(bond->params.downdelay)
1102                         printk(KERN_INFO DRV_NAME
1103                               ": %s: Note: Updating downdelay (to %d) "
1104                               "since it is a multiple of the miimon value.\n",
1105                               bond->dev->name,
1106                               bond->params.downdelay * bond->params.miimon);
1107                 if (bond->params.arp_interval) {
1108                         printk(KERN_INFO DRV_NAME
1109                                ": %s: MII monitoring cannot be used with "
1110                                "ARP monitoring. Disabling ARP monitoring...\n",
1111                                bond->dev->name);
1112                         bond->params.arp_interval = 0;
1113                         bond->dev->priv_flags &= ~IFF_MASTER_ARPMON;
1114                         if (bond->params.arp_validate) {
1115                                 bond_unregister_arp(bond);
1116                                 bond->params.arp_validate =
1117                                         BOND_ARP_VALIDATE_NONE;
1118                         }
1119                         if (delayed_work_pending(&bond->arp_work)) {
1120                                 cancel_delayed_work(&bond->arp_work);
1121                                 flush_workqueue(bond->wq);
1122                         }
1123                 }
1124
1125                 if (bond->dev->flags & IFF_UP) {
1126                         /* If the interface is up, we may need to fire off
1127                          * the MII timer. If the interface is down, the
1128                          * timer will get fired off when the open function
1129                          * is called.
1130                          */
1131                         if (!delayed_work_pending(&bond->mii_work)) {
1132                                 INIT_DELAYED_WORK(&bond->mii_work,
1133                                                   bond_mii_monitor);
1134                                 queue_delayed_work(bond->wq,
1135                                                    &bond->mii_work, 0);
1136                         }
1137                 }
1138         }
1139 out:
1140         return ret;
1141 }
1142 static DEVICE_ATTR(miimon, S_IRUGO | S_IWUSR, bonding_show_miimon, bonding_store_miimon);
1143
1144 /*
1145  * Show and set the primary slave.  The store function is much
1146  * simpler than bonding_store_slaves function because it only needs to
1147  * handle one interface name.
1148  * The bond must be a mode that supports a primary for this be
1149  * set.
1150  */
1151 static ssize_t bonding_show_primary(struct device *d,
1152                                     struct device_attribute *attr,
1153                                     char *buf)
1154 {
1155         int count = 0;
1156         struct bonding *bond = to_bond(d);
1157
1158         if (bond->primary_slave)
1159                 count = sprintf(buf, "%s\n", bond->primary_slave->dev->name);
1160
1161         return count;
1162 }
1163
1164 static ssize_t bonding_store_primary(struct device *d,
1165                                      struct device_attribute *attr,
1166                                      const char *buf, size_t count)
1167 {
1168         int i;
1169         struct slave *slave;
1170         struct bonding *bond = to_bond(d);
1171
1172         rtnl_lock();
1173         read_lock(&bond->lock);
1174         write_lock_bh(&bond->curr_slave_lock);
1175
1176         if (!USES_PRIMARY(bond->params.mode)) {
1177                 printk(KERN_INFO DRV_NAME
1178                        ": %s: Unable to set primary slave; %s is in mode %d\n",
1179                        bond->dev->name, bond->dev->name, bond->params.mode);
1180         } else {
1181                 bond_for_each_slave(bond, slave, i) {
1182                         if (strnicmp
1183                             (slave->dev->name, buf,
1184                              strlen(slave->dev->name)) == 0) {
1185                                 printk(KERN_INFO DRV_NAME
1186                                        ": %s: Setting %s as primary slave.\n",
1187                                        bond->dev->name, slave->dev->name);
1188                                 bond->primary_slave = slave;
1189                                 bond_select_active_slave(bond);
1190                                 goto out;
1191                         }
1192                 }
1193
1194                 /* if we got here, then we didn't match the name of any slave */
1195
1196                 if (strlen(buf) == 0 || buf[0] == '\n') {
1197                         printk(KERN_INFO DRV_NAME
1198                                ": %s: Setting primary slave to None.\n",
1199                                bond->dev->name);
1200                         bond->primary_slave = NULL;
1201                                 bond_select_active_slave(bond);
1202                 } else {
1203                         printk(KERN_INFO DRV_NAME
1204                                ": %s: Unable to set %.*s as primary slave as it is not a slave.\n",
1205                                bond->dev->name, (int)strlen(buf) - 1, buf);
1206                 }
1207         }
1208 out:
1209         write_unlock_bh(&bond->curr_slave_lock);
1210         read_unlock(&bond->lock);
1211         rtnl_unlock();
1212
1213         return count;
1214 }
1215 static DEVICE_ATTR(primary, S_IRUGO | S_IWUSR, bonding_show_primary, bonding_store_primary);
1216
1217 /*
1218  * Show and set the use_carrier flag.
1219  */
1220 static ssize_t bonding_show_carrier(struct device *d,
1221                                     struct device_attribute *attr,
1222                                     char *buf)
1223 {
1224         struct bonding *bond = to_bond(d);
1225
1226         return sprintf(buf, "%d\n", bond->params.use_carrier);
1227 }
1228
1229 static ssize_t bonding_store_carrier(struct device *d,
1230                                      struct device_attribute *attr,
1231                                      const char *buf, size_t count)
1232 {
1233         int new_value, ret = count;
1234         struct bonding *bond = to_bond(d);
1235
1236
1237         if (sscanf(buf, "%d", &new_value) != 1) {
1238                 printk(KERN_ERR DRV_NAME
1239                        ": %s: no use_carrier value specified.\n",
1240                        bond->dev->name);
1241                 ret = -EINVAL;
1242                 goto out;
1243         }
1244         if ((new_value == 0) || (new_value == 1)) {
1245                 bond->params.use_carrier = new_value;
1246                 printk(KERN_INFO DRV_NAME ": %s: Setting use_carrier to %d.\n",
1247                        bond->dev->name, new_value);
1248         } else {
1249                 printk(KERN_INFO DRV_NAME
1250                        ": %s: Ignoring invalid use_carrier value %d.\n",
1251                        bond->dev->name, new_value);
1252         }
1253 out:
1254         return count;
1255 }
1256 static DEVICE_ATTR(use_carrier, S_IRUGO | S_IWUSR, bonding_show_carrier, bonding_store_carrier);
1257
1258
1259 /*
1260  * Show and set currently active_slave.
1261  */
1262 static ssize_t bonding_show_active_slave(struct device *d,
1263                                          struct device_attribute *attr,
1264                                          char *buf)
1265 {
1266         struct slave *curr;
1267         struct bonding *bond = to_bond(d);
1268         int count = 0;
1269
1270         read_lock(&bond->curr_slave_lock);
1271         curr = bond->curr_active_slave;
1272         read_unlock(&bond->curr_slave_lock);
1273
1274         if (USES_PRIMARY(bond->params.mode) && curr)
1275                 count = sprintf(buf, "%s\n", curr->dev->name);
1276         return count;
1277 }
1278
1279 static ssize_t bonding_store_active_slave(struct device *d,
1280                                           struct device_attribute *attr,
1281                                           const char *buf, size_t count)
1282 {
1283         int i;
1284         struct slave *slave;
1285         struct slave *old_active = NULL;
1286         struct slave *new_active = NULL;
1287         struct bonding *bond = to_bond(d);
1288
1289         rtnl_lock();
1290         read_lock(&bond->lock);
1291         write_lock_bh(&bond->curr_slave_lock);
1292
1293         if (!USES_PRIMARY(bond->params.mode)) {
1294                 printk(KERN_INFO DRV_NAME
1295                        ": %s: Unable to change active slave; %s is in mode %d\n",
1296                        bond->dev->name, bond->dev->name, bond->params.mode);
1297         } else {
1298                 bond_for_each_slave(bond, slave, i) {
1299                         if (strnicmp
1300                             (slave->dev->name, buf,
1301                              strlen(slave->dev->name)) == 0) {
1302                                 old_active = bond->curr_active_slave;
1303                                 new_active = slave;
1304                                 if (new_active == old_active) {
1305                                         /* do nothing */
1306                                         printk(KERN_INFO DRV_NAME
1307                                                ": %s: %s is already the current active slave.\n",
1308                                                bond->dev->name, slave->dev->name);
1309                                         goto out;
1310                                 }
1311                                 else {
1312                                         if ((new_active) &&
1313                                             (old_active) &&
1314                                             (new_active->link == BOND_LINK_UP) &&
1315                                             IS_UP(new_active->dev)) {
1316                                                 printk(KERN_INFO DRV_NAME
1317                                                       ": %s: Setting %s as active slave.\n",
1318                                                       bond->dev->name, slave->dev->name);
1319                                                 bond_change_active_slave(bond, new_active);
1320                                         }
1321                                         else {
1322                                                 printk(KERN_INFO DRV_NAME
1323                                                       ": %s: Could not set %s as active slave; "
1324                                                       "either %s is down or the link is down.\n",
1325                                                       bond->dev->name, slave->dev->name,
1326                                                       slave->dev->name);
1327                                         }
1328                                         goto out;
1329                                 }
1330                         }
1331                 }
1332
1333                 /* if we got here, then we didn't match the name of any slave */
1334
1335                 if (strlen(buf) == 0 || buf[0] == '\n') {
1336                         printk(KERN_INFO DRV_NAME
1337                                ": %s: Setting active slave to None.\n",
1338                                bond->dev->name);
1339                         bond->primary_slave = NULL;
1340                                 bond_select_active_slave(bond);
1341                 } else {
1342                         printk(KERN_INFO DRV_NAME
1343                                ": %s: Unable to set %.*s as active slave as it is not a slave.\n",
1344                                bond->dev->name, (int)strlen(buf) - 1, buf);
1345                 }
1346         }
1347 out:
1348         write_unlock_bh(&bond->curr_slave_lock);
1349         read_unlock(&bond->lock);
1350         rtnl_unlock();
1351
1352         return count;
1353
1354 }
1355 static DEVICE_ATTR(active_slave, S_IRUGO | S_IWUSR, bonding_show_active_slave, bonding_store_active_slave);
1356
1357
1358 /*
1359  * Show link status of the bond interface.
1360  */
1361 static ssize_t bonding_show_mii_status(struct device *d,
1362                                        struct device_attribute *attr,
1363                                        char *buf)
1364 {
1365         struct slave *curr;
1366         struct bonding *bond = to_bond(d);
1367
1368         read_lock(&bond->curr_slave_lock);
1369         curr = bond->curr_active_slave;
1370         read_unlock(&bond->curr_slave_lock);
1371
1372         return sprintf(buf, "%s\n", (curr) ? "up" : "down");
1373 }
1374 static DEVICE_ATTR(mii_status, S_IRUGO, bonding_show_mii_status, NULL);
1375
1376
1377 /*
1378  * Show current 802.3ad aggregator ID.
1379  */
1380 static ssize_t bonding_show_ad_aggregator(struct device *d,
1381                                           struct device_attribute *attr,
1382                                           char *buf)
1383 {
1384         int count = 0;
1385         struct bonding *bond = to_bond(d);
1386
1387         if (bond->params.mode == BOND_MODE_8023AD) {
1388                 struct ad_info ad_info;
1389                 count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.aggregator_id);
1390         }
1391
1392         return count;
1393 }
1394 static DEVICE_ATTR(ad_aggregator, S_IRUGO, bonding_show_ad_aggregator, NULL);
1395
1396
1397 /*
1398  * Show number of active 802.3ad ports.
1399  */
1400 static ssize_t bonding_show_ad_num_ports(struct device *d,
1401                                          struct device_attribute *attr,
1402                                          char *buf)
1403 {
1404         int count = 0;
1405         struct bonding *bond = to_bond(d);
1406
1407         if (bond->params.mode == BOND_MODE_8023AD) {
1408                 struct ad_info ad_info;
1409                 count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0: ad_info.ports);
1410         }
1411
1412         return count;
1413 }
1414 static DEVICE_ATTR(ad_num_ports, S_IRUGO, bonding_show_ad_num_ports, NULL);
1415
1416
1417 /*
1418  * Show current 802.3ad actor key.
1419  */
1420 static ssize_t bonding_show_ad_actor_key(struct device *d,
1421                                          struct device_attribute *attr,
1422                                          char *buf)
1423 {
1424         int count = 0;
1425         struct bonding *bond = to_bond(d);
1426
1427         if (bond->params.mode == BOND_MODE_8023AD) {
1428                 struct ad_info ad_info;
1429                 count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.actor_key);
1430         }
1431
1432         return count;
1433 }
1434 static DEVICE_ATTR(ad_actor_key, S_IRUGO, bonding_show_ad_actor_key, NULL);
1435
1436
1437 /*
1438  * Show current 802.3ad partner key.
1439  */
1440 static ssize_t bonding_show_ad_partner_key(struct device *d,
1441                                            struct device_attribute *attr,
1442                                            char *buf)
1443 {
1444         int count = 0;
1445         struct bonding *bond = to_bond(d);
1446
1447         if (bond->params.mode == BOND_MODE_8023AD) {
1448                 struct ad_info ad_info;
1449                 count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.partner_key);
1450         }
1451
1452         return count;
1453 }
1454 static DEVICE_ATTR(ad_partner_key, S_IRUGO, bonding_show_ad_partner_key, NULL);
1455
1456
1457 /*
1458  * Show current 802.3ad partner mac.
1459  */
1460 static ssize_t bonding_show_ad_partner_mac(struct device *d,
1461                                            struct device_attribute *attr,
1462                                            char *buf)
1463 {
1464         int count = 0;
1465         struct bonding *bond = to_bond(d);
1466
1467         if (bond->params.mode == BOND_MODE_8023AD) {
1468                 struct ad_info ad_info;
1469                 if (!bond_3ad_get_active_agg_info(bond, &ad_info)) {
1470                         count = sprintf(buf, "%pM\n", ad_info.partner_system);
1471                 }
1472         }
1473
1474         return count;
1475 }
1476 static DEVICE_ATTR(ad_partner_mac, S_IRUGO, bonding_show_ad_partner_mac, NULL);
1477
1478
1479
1480 static struct attribute *per_bond_attrs[] = {
1481         &dev_attr_slaves.attr,
1482         &dev_attr_mode.attr,
1483         &dev_attr_fail_over_mac.attr,
1484         &dev_attr_arp_validate.attr,
1485         &dev_attr_arp_interval.attr,
1486         &dev_attr_arp_ip_target.attr,
1487         &dev_attr_downdelay.attr,
1488         &dev_attr_updelay.attr,
1489         &dev_attr_lacp_rate.attr,
1490         &dev_attr_ad_select.attr,
1491         &dev_attr_xmit_hash_policy.attr,
1492         &dev_attr_num_grat_arp.attr,
1493         &dev_attr_num_unsol_na.attr,
1494         &dev_attr_miimon.attr,
1495         &dev_attr_primary.attr,
1496         &dev_attr_use_carrier.attr,
1497         &dev_attr_active_slave.attr,
1498         &dev_attr_mii_status.attr,
1499         &dev_attr_ad_aggregator.attr,
1500         &dev_attr_ad_num_ports.attr,
1501         &dev_attr_ad_actor_key.attr,
1502         &dev_attr_ad_partner_key.attr,
1503         &dev_attr_ad_partner_mac.attr,
1504         NULL,
1505 };
1506
1507 static struct attribute_group bonding_group = {
1508         .name = "bonding",
1509         .attrs = per_bond_attrs,
1510 };
1511
1512 /*
1513  * Initialize sysfs.  This sets up the bonding_masters file in
1514  * /sys/class/net.
1515  */
1516 int bond_create_sysfs(void)
1517 {
1518         int ret;
1519
1520         ret = netdev_class_create_file(&class_attr_bonding_masters);
1521         /*
1522          * Permit multiple loads of the module by ignoring failures to
1523          * create the bonding_masters sysfs file.  Bonding devices
1524          * created by second or subsequent loads of the module will
1525          * not be listed in, or controllable by, bonding_masters, but
1526          * will have the usual "bonding" sysfs directory.
1527          *
1528          * This is done to preserve backwards compatibility for
1529          * initscripts/sysconfig, which load bonding multiple times to
1530          * configure multiple bonding devices.
1531          */
1532         if (ret == -EEXIST) {
1533                 /* Is someone being kinky and naming a device bonding_master? */
1534                 if (__dev_get_by_name(&init_net,
1535                                       class_attr_bonding_masters.attr.name))
1536                         printk(KERN_ERR
1537                                "network device named %s already exists in sysfs",
1538                                class_attr_bonding_masters.attr.name);
1539         }
1540
1541         return ret;
1542
1543 }
1544
1545 /*
1546  * Remove /sys/class/net/bonding_masters.
1547  */
1548 void bond_destroy_sysfs(void)
1549 {
1550         netdev_class_remove_file(&class_attr_bonding_masters);
1551 }
1552
1553 /*
1554  * Initialize sysfs for each bond.  This sets up and registers
1555  * the 'bondctl' directory for each individual bond under /sys/class/net.
1556  */
1557 int bond_create_sysfs_entry(struct bonding *bond)
1558 {
1559         struct net_device *dev = bond->dev;
1560         int err;
1561
1562         err = sysfs_create_group(&(dev->dev.kobj), &bonding_group);
1563         if (err) {
1564                 printk(KERN_EMERG "eek! didn't create group!\n");
1565         }
1566
1567         if (expected_refcount < 1)
1568                 expected_refcount = atomic_read(&bond->dev->dev.kobj.kref.refcount);
1569
1570         return err;
1571 }
1572 /*
1573  * Remove sysfs entries for each bond.
1574  */
1575 void bond_destroy_sysfs_entry(struct bonding *bond)
1576 {
1577         struct net_device *dev = bond->dev;
1578
1579         sysfs_remove_group(&(dev->dev.kobj), &bonding_group);
1580 }
1581