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) && !done; 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                                 ret = -EINVAL;
 693                                 goto out;
 694                         }
 695                         if (targets[i] == 0) {
 696                                 printk(KERN_INFO DRV_NAME
 697                                        ": %s: adding ARP target %pI4.\n",
 698                                        bond->dev->name, &newtarget);
 699                                 done = 1;
 700                                 targets[i] = newtarget;
 701                         }
 702                 }
 703                 if (!done) {
 704                         printk(KERN_ERR DRV_NAME
 705                                ": %s: ARP target table is full!\n",
 706                                bond->dev->name);
 707                         ret = -EINVAL;
 708                         goto out;
 709                 }
 710
 711         }
 712         else if (buf[0] == '-') {
 713                 if ((newtarget == 0) || (newtarget == htonl(INADDR_BROADCAST))) {
 714                         printk(KERN_ERR DRV_NAME
 715                                ": %s: invalid ARP target %pI4 specified for removal\n",
 716                                bond->dev->name, &newtarget);
 717                         ret = -EINVAL;
 718                         goto out;
 719                 }
 720
 721                 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && !done; i++) {
 722                         if (targets[i] == newtarget) {
 723                                 int j;
 724                                 printk(KERN_INFO DRV_NAME
 725                                        ": %s: removing ARP target %pI4.\n",
 726                                        bond->dev->name, &newtarget);
 727                                 for (j = i; (j < (BOND_MAX_ARP_TARGETS-1)) && targets[j+1]; j++)
 728                                         targets[j] = targets[j+1];
 729
 730                                 targets[j] = 0;
 731                                 done = 1;
 732                         }
 733                 }
 734                 if (!done) {
 735                         printk(KERN_INFO DRV_NAME
 736                                ": %s: unable to remove nonexistent ARP target %pI4.\n",
 737                                bond->dev->name, &newtarget);
 738                         ret = -EINVAL;
 739                         goto out;
 740                 }
 741         }
 742         else {
 743                 printk(KERN_ERR DRV_NAME ": no command found in arp_ip_targets file for bond %s. Use +<addr> or -<addr>.\n",
 744                         bond->dev->name);
 745                 ret = -EPERM;
 746                 goto out;
 747         }
 748
 749 out:
 750         return ret;
 751 }
 752 static DEVICE_ATTR(arp_ip_target, S_IRUGO | S_IWUSR , bonding_show_arp_targets, bonding_store_arp_targets);
 753
 754 /*
 755  * Show and set the up and down delays.  These must be multiples of the
 756  * MII monitoring value, and are stored internally as the multiplier.
 757  * Thus, we must translate to MS for the real world.
 758  */
 759 static ssize_t bonding_show_downdelay(struct device *d,
 760                                       struct device_attribute *attr,
 761                                       char *buf)
 762 {
 763         struct bonding *bond = to_bond(d);
 764
 765         return sprintf(buf, "%d\n", bond->params.downdelay * bond->params.miimon);
 766 }
 767
 768 static ssize_t bonding_store_downdelay(struct device *d,
 769                                        struct device_attribute *attr,
 770                                        const char *buf, size_t count)
 771 {
 772         int new_value, ret = count;
 773         struct bonding *bond = to_bond(d);
 774
 775         if (!(bond->params.miimon)) {
 776                 printk(KERN_ERR DRV_NAME
 777                        ": %s: Unable to set down delay as MII monitoring is disabled\n",
 778                        bond->dev->name);
 779                 ret = -EPERM;
 780                 goto out;
 781         }
 782
 783         if (sscanf(buf, "%d", &new_value) != 1) {
 784                 printk(KERN_ERR DRV_NAME
 785                        ": %s: no down delay value specified.\n",
 786                        bond->dev->name);
 787                 ret = -EINVAL;
 788                 goto out;
 789         }
 790         if (new_value < 0) {
 791                 printk(KERN_ERR DRV_NAME
 792                        ": %s: Invalid down delay value %d not in range %d-%d; rejected.\n",
 793                        bond->dev->name, new_value, 1, INT_MAX);
 794                 ret = -EINVAL;
 795                 goto out;
 796         } else {
 797                 if ((new_value % bond->params.miimon) != 0) {
 798                         printk(KERN_WARNING DRV_NAME
 799                                ": %s: Warning: down delay (%d) is not a multiple "
 800                                "of miimon (%d), delay rounded to %d ms\n",
 801                                bond->dev->name, new_value, bond->params.miimon,
 802                                (new_value / bond->params.miimon) *
 803                                bond->params.miimon);
 804                 }
 805                 bond->params.downdelay = new_value / bond->params.miimon;
 806                 printk(KERN_INFO DRV_NAME ": %s: Setting down delay to %d.\n",
 807                        bond->dev->name, bond->params.downdelay * bond->params.miimon);
 808
 809         }
 810
 811 out:
 812         return ret;
 813 }
 814 static DEVICE_ATTR(downdelay, S_IRUGO | S_IWUSR , bonding_show_downdelay, bonding_store_downdelay);
 815
 816 static ssize_t bonding_show_updelay(struct device *d,
 817                                     struct device_attribute *attr,
 818                                     char *buf)
 819 {
 820         struct bonding *bond = to_bond(d);
 821
 822         return sprintf(buf, "%d\n", bond->params.updelay * bond->params.miimon);
 823
 824 }
 825
 826 static ssize_t bonding_store_updelay(struct device *d,
 827                                      struct device_attribute *attr,
 828                                      const char *buf, size_t count)
 829 {
 830         int new_value, ret = count;
 831         struct bonding *bond = to_bond(d);
 832
 833         if (!(bond->params.miimon)) {
 834                 printk(KERN_ERR DRV_NAME
 835                        ": %s: Unable to set up delay as MII monitoring is disabled\n",
 836                        bond->dev->name);
 837                 ret = -EPERM;
 838                 goto out;
 839         }
 840
 841         if (sscanf(buf, "%d", &new_value) != 1) {
 842                 printk(KERN_ERR DRV_NAME
 843                        ": %s: no up delay value specified.\n",
 844                        bond->dev->name);
 845                 ret = -EINVAL;
 846                 goto out;
 847         }
 848         if (new_value < 0) {
 849                 printk(KERN_ERR DRV_NAME
 850                        ": %s: Invalid down delay value %d not in range %d-%d; rejected.\n",
 851                        bond->dev->name, new_value, 1, INT_MAX);
 852                 ret = -EINVAL;
 853                 goto out;
 854         } else {
 855                 if ((new_value % bond->params.miimon) != 0) {
 856                         printk(KERN_WARNING DRV_NAME
 857                                ": %s: Warning: up delay (%d) is not a multiple "
 858                                "of miimon (%d), updelay rounded to %d ms\n",
 859                                bond->dev->name, new_value, bond->params.miimon,
 860                                (new_value / bond->params.miimon) *
 861                                bond->params.miimon);
 862                 }
 863                 bond->params.updelay = new_value / bond->params.miimon;
 864                 printk(KERN_INFO DRV_NAME ": %s: Setting up delay to %d.\n",
 865                        bond->dev->name, bond->params.updelay * bond->params.miimon);
 866
 867         }
 868
 869 out:
 870         return ret;
 871 }
 872 static DEVICE_ATTR(updelay, S_IRUGO | S_IWUSR , bonding_show_updelay, bonding_store_updelay);
 873
 874 /*
 875  * Show and set the LACP interval.  Interface must be down, and the mode
 876  * must be set to 802.3ad mode.
 877  */
 878 static ssize_t bonding_show_lacp(struct device *d,
 879                                  struct device_attribute *attr,
 880                                  char *buf)
 881 {
 882         struct bonding *bond = to_bond(d);
 883
 884         return sprintf(buf, "%s %d\n",
 885                 bond_lacp_tbl[bond->params.lacp_fast].modename,
 886                 bond->params.lacp_fast);
 887 }
 888
 889 static ssize_t bonding_store_lacp(struct device *d,
 890                                   struct device_attribute *attr,
 891                                   const char *buf, size_t count)
 892 {
 893         int new_value, ret = count;
 894         struct bonding *bond = to_bond(d);
 895
 896         if (bond->dev->flags & IFF_UP) {
 897                 printk(KERN_ERR DRV_NAME
 898                        ": %s: Unable to update LACP rate because interface is up.\n",
 899                        bond->dev->name);
 900                 ret = -EPERM;
 901                 goto out;
 902         }
 903
 904         if (bond->params.mode != BOND_MODE_8023AD) {
 905                 printk(KERN_ERR DRV_NAME
 906                        ": %s: Unable to update LACP rate because bond is not in 802.3ad mode.\n",
 907                        bond->dev->name);
 908                 ret = -EPERM;
 909                 goto out;
 910         }
 911
 912         new_value = bond_parse_parm(buf, bond_lacp_tbl);
 913
 914         if ((new_value == 1) || (new_value == 0)) {
 915                 bond->params.lacp_fast = new_value;
 916                 printk(KERN_INFO DRV_NAME
 917                        ": %s: Setting LACP rate to %s (%d).\n",
 918                        bond->dev->name, bond_lacp_tbl[new_value].modename, new_value);
 919         } else {
 920                 printk(KERN_ERR DRV_NAME
 921                        ": %s: Ignoring invalid LACP rate value %.*s.\n",
 922                         bond->dev->name, (int)strlen(buf) - 1, buf);
 923                 ret = -EINVAL;
 924         }
 925 out:
 926         return ret;
 927 }
 928 static DEVICE_ATTR(lacp_rate, S_IRUGO | S_IWUSR, bonding_show_lacp, bonding_store_lacp);
 929
 930 static ssize_t bonding_show_ad_select(struct device *d,
 931                                       struct device_attribute *attr,
 932                                       char *buf)
 933 {
 934         struct bonding *bond = to_bond(d);
 935
 936         return sprintf(buf, "%s %d\n",
 937                 ad_select_tbl[bond->params.ad_select].modename,
 938                 bond->params.ad_select);
 939 }
 940
 941
 942 static ssize_t bonding_store_ad_select(struct device *d,
 943                                        struct device_attribute *attr,
 944                                        const char *buf, size_t count)
 945 {
 946         int new_value, ret = count;
 947         struct bonding *bond = to_bond(d);
 948
 949         if (bond->dev->flags & IFF_UP) {
 950                 printk(KERN_ERR DRV_NAME
 951                        ": %s: Unable to update ad_select because interface "
 952                        "is up.\n", bond->dev->name);
 953                 ret = -EPERM;
 954                 goto out;
 955         }
 956
 957         new_value = bond_parse_parm(buf, ad_select_tbl);
 958
 959         if (new_value != -1) {
 960                 bond->params.ad_select = new_value;
 961                 printk(KERN_INFO DRV_NAME
 962                        ": %s: Setting ad_select to %s (%d).\n",
 963                        bond->dev->name, ad_select_tbl[new_value].modename,
 964                        new_value);
 965         } else {
 966                 printk(KERN_ERR DRV_NAME
 967                        ": %s: Ignoring invalid ad_select value %.*s.\n",
 968                        bond->dev->name, (int)strlen(buf) - 1, buf);
 969                 ret = -EINVAL;
 970         }
 971 out:
 972         return ret;
 973 }
 974
 975 static DEVICE_ATTR(ad_select, S_IRUGO | S_IWUSR, bonding_show_ad_select, bonding_store_ad_select);
 976
 977 /*
 978  * Show and set the number of grat ARP to send after a failover event.
 979  */
 980 static ssize_t bonding_show_n_grat_arp(struct device *d,
 981                                    struct device_attribute *attr,
 982                                    char *buf)
 983 {
 984         struct bonding *bond = to_bond(d);
 985
 986         return sprintf(buf, "%d\n", bond->params.num_grat_arp);
 987 }
 988
 989 static ssize_t bonding_store_n_grat_arp(struct device *d,
 990                                     struct device_attribute *attr,
 991                                     const char *buf, size_t count)
 992 {
 993         int new_value, ret = count;
 994         struct bonding *bond = to_bond(d);
 995
 996         if (sscanf(buf, "%d", &new_value) != 1) {
 997                 printk(KERN_ERR DRV_NAME
 998                        ": %s: no num_grat_arp value specified.\n",
 999                        bond->dev->name);
1000                 ret = -EINVAL;
1001                 goto out;
1002         }
1003         if (new_value < 0 || new_value > 255) {
1004                 printk(KERN_ERR DRV_NAME
1005                        ": %s: Invalid num_grat_arp value %d not in range 0-255; rejected.\n",
1006                        bond->dev->name, new_value);
1007                 ret = -EINVAL;
1008                 goto out;
1009         } else {
1010                 bond->params.num_grat_arp = new_value;
1011         }
1012 out:
1013         return ret;
1014 }
1015 static DEVICE_ATTR(num_grat_arp, S_IRUGO | S_IWUSR, bonding_show_n_grat_arp, bonding_store_n_grat_arp);
1016
1017 /*
1018  * Show and set the number of unsolicted NA's to send after a failover event.
1019  */
1020 static ssize_t bonding_show_n_unsol_na(struct device *d,
1021                                        struct device_attribute *attr,
1022                                        char *buf)
1023 {
1024         struct bonding *bond = to_bond(d);
1025
1026         return sprintf(buf, "%d\n", bond->params.num_unsol_na);
1027 }
1028
1029 static ssize_t bonding_store_n_unsol_na(struct device *d,
1030                                         struct device_attribute *attr,
1031                                         const char *buf, size_t count)
1032 {
1033         int new_value, ret = count;
1034         struct bonding *bond = to_bond(d);
1035
1036         if (sscanf(buf, "%d", &new_value) != 1) {
1037                 printk(KERN_ERR DRV_NAME
1038                        ": %s: no num_unsol_na value specified.\n",
1039                        bond->dev->name);
1040                 ret = -EINVAL;
1041                 goto out;
1042         }
1043         if (new_value < 0 || new_value > 255) {
1044                 printk(KERN_ERR DRV_NAME
1045                        ": %s: Invalid num_unsol_na value %d not in range 0-255; rejected.\n",
1046                        bond->dev->name, new_value);
1047                 ret = -EINVAL;
1048                 goto out;
1049         } else {
1050                 bond->params.num_unsol_na = new_value;
1051         }
1052 out:
1053         return ret;
1054 }
1055 static DEVICE_ATTR(num_unsol_na, S_IRUGO | S_IWUSR, bonding_show_n_unsol_na, bonding_store_n_unsol_na);
1056
1057 /*
1058  * Show and set the MII monitor interval.  There are two tricky bits
1059  * here.  First, if MII monitoring is activated, then we must disable
1060  * ARP monitoring.  Second, if the timer isn't running, we must
1061  * start it.
1062  */
1063 static ssize_t bonding_show_miimon(struct device *d,
1064                                    struct device_attribute *attr,
1065                                    char *buf)
1066 {
1067         struct bonding *bond = to_bond(d);
1068
1069         return sprintf(buf, "%d\n", bond->params.miimon);
1070 }
1071
1072 static ssize_t bonding_store_miimon(struct device *d,
1073                                     struct device_attribute *attr,
1074                                     const char *buf, size_t count)
1075 {
1076         int new_value, ret = count;
1077         struct bonding *bond = to_bond(d);
1078
1079         if (sscanf(buf, "%d", &new_value) != 1) {
1080                 printk(KERN_ERR DRV_NAME
1081                        ": %s: no miimon value specified.\n",
1082                        bond->dev->name);
1083                 ret = -EINVAL;
1084                 goto out;
1085         }
1086         if (new_value < 0) {
1087                 printk(KERN_ERR DRV_NAME
1088                        ": %s: Invalid miimon value %d not in range %d-%d; rejected.\n",
1089                        bond->dev->name, new_value, 1, INT_MAX);
1090                 ret = -EINVAL;
1091                 goto out;
1092         } else {
1093                 printk(KERN_INFO DRV_NAME
1094                        ": %s: Setting MII monitoring interval to %d.\n",
1095                        bond->dev->name, new_value);
1096                 bond->params.miimon = new_value;
1097                 if(bond->params.updelay)
1098                         printk(KERN_INFO DRV_NAME
1099                               ": %s: Note: Updating updelay (to %d) "
1100                               "since it is a multiple of the miimon value.\n",
1101                               bond->dev->name,
1102                               bond->params.updelay * bond->params.miimon);
1103                 if(bond->params.downdelay)
1104                         printk(KERN_INFO DRV_NAME
1105                               ": %s: Note: Updating downdelay (to %d) "
1106                               "since it is a multiple of the miimon value.\n",
1107                               bond->dev->name,
1108                               bond->params.downdelay * bond->params.miimon);
1109                 if (bond->params.arp_interval) {
1110                         printk(KERN_INFO DRV_NAME
1111                                ": %s: MII monitoring cannot be used with "
1112                                "ARP monitoring. Disabling ARP monitoring...\n",
1113                                bond->dev->name);
1114                         bond->params.arp_interval = 0;
1115                         bond->dev->priv_flags &= ~IFF_MASTER_ARPMON;
1116                         if (bond->params.arp_validate) {
1117                                 bond_unregister_arp(bond);
1118                                 bond->params.arp_validate =
1119                                         BOND_ARP_VALIDATE_NONE;
1120                         }
1121                         if (delayed_work_pending(&bond->arp_work)) {
1122                                 cancel_delayed_work(&bond->arp_work);
1123                                 flush_workqueue(bond->wq);
1124                         }
1125                 }
1126
1127                 if (bond->dev->flags & IFF_UP) {
1128                         /* If the interface is up, we may need to fire off
1129                          * the MII timer. If the interface is down, the
1130                          * timer will get fired off when the open function
1131                          * is called.
1132                          */
1133                         if (!delayed_work_pending(&bond->mii_work)) {
1134                                 INIT_DELAYED_WORK(&bond->mii_work,
1135                                                   bond_mii_monitor);
1136                                 queue_delayed_work(bond->wq,
1137                                                    &bond->mii_work, 0);
1138                         }
1139                 }
1140         }
1141 out:
1142         return ret;
1143 }
1144 static DEVICE_ATTR(miimon, S_IRUGO | S_IWUSR, bonding_show_miimon, bonding_store_miimon);
1145
1146 /*
1147  * Show and set the primary slave.  The store function is much
1148  * simpler than bonding_store_slaves function because it only needs to
1149  * handle one interface name.
1150  * The bond must be a mode that supports a primary for this be
1151  * set.
1152  */
1153 static ssize_t bonding_show_primary(struct device *d,
1154                                     struct device_attribute *attr,
1155                                     char *buf)
1156 {
1157         int count = 0;
1158         struct bonding *bond = to_bond(d);
1159
1160         if (bond->primary_slave)
1161                 count = sprintf(buf, "%s\n", bond->primary_slave->dev->name);
1162
1163         return count;
1164 }
1165
1166 static ssize_t bonding_store_primary(struct device *d,
1167                                      struct device_attribute *attr,
1168                                      const char *buf, size_t count)
1169 {
1170         int i;
1171         struct slave *slave;
1172         struct bonding *bond = to_bond(d);
1173
1174         rtnl_lock();
1175         read_lock(&bond->lock);
1176         write_lock_bh(&bond->curr_slave_lock);
1177
1178         if (!USES_PRIMARY(bond->params.mode)) {
1179                 printk(KERN_INFO DRV_NAME
1180                        ": %s: Unable to set primary slave; %s is in mode %d\n",
1181                        bond->dev->name, bond->dev->name, bond->params.mode);
1182         } else {
1183                 bond_for_each_slave(bond, slave, i) {
1184                         if (strnicmp
1185                             (slave->dev->name, buf,
1186                              strlen(slave->dev->name)) == 0) {
1187                                 printk(KERN_INFO DRV_NAME
1188                                        ": %s: Setting %s as primary slave.\n",
1189                                        bond->dev->name, slave->dev->name);
1190                                 bond->primary_slave = slave;
1191                                 bond_select_active_slave(bond);
1192                                 goto out;
1193                         }
1194                 }
1195
1196                 /* if we got here, then we didn't match the name of any slave */
1197
1198                 if (strlen(buf) == 0 || buf[0] == '\n') {
1199                         printk(KERN_INFO DRV_NAME
1200                                ": %s: Setting primary slave to None.\n",
1201                                bond->dev->name);
1202                         bond->primary_slave = NULL;
1203                                 bond_select_active_slave(bond);
1204                 } else {
1205                         printk(KERN_INFO DRV_NAME
1206                                ": %s: Unable to set %.*s as primary slave as it is not a slave.\n",
1207                                bond->dev->name, (int)strlen(buf) - 1, buf);
1208                 }
1209         }
1210 out:
1211         write_unlock_bh(&bond->curr_slave_lock);
1212         read_unlock(&bond->lock);
1213         rtnl_unlock();
1214
1215         return count;
1216 }
1217 static DEVICE_ATTR(primary, S_IRUGO | S_IWUSR, bonding_show_primary, bonding_store_primary);
1218
1219 /*
1220  * Show and set the use_carrier flag.
1221  */
1222 static ssize_t bonding_show_carrier(struct device *d,
1223                                     struct device_attribute *attr,
1224                                     char *buf)
1225 {
1226         struct bonding *bond = to_bond(d);
1227
1228         return sprintf(buf, "%d\n", bond->params.use_carrier);
1229 }
1230
1231 static ssize_t bonding_store_carrier(struct device *d,
1232                                      struct device_attribute *attr,
1233                                      const char *buf, size_t count)
1234 {
1235         int new_value, ret = count;
1236         struct bonding *bond = to_bond(d);
1237
1238
1239         if (sscanf(buf, "%d", &new_value) != 1) {
1240                 printk(KERN_ERR DRV_NAME
1241                        ": %s: no use_carrier value specified.\n",
1242                        bond->dev->name);
1243                 ret = -EINVAL;
1244                 goto out;
1245         }
1246         if ((new_value == 0) || (new_value == 1)) {
1247                 bond->params.use_carrier = new_value;
1248                 printk(KERN_INFO DRV_NAME ": %s: Setting use_carrier to %d.\n",
1249                        bond->dev->name, new_value);
1250         } else {
1251                 printk(KERN_INFO DRV_NAME
1252                        ": %s: Ignoring invalid use_carrier value %d.\n",
1253                        bond->dev->name, new_value);
1254         }
1255 out:
1256         return count;
1257 }
1258 static DEVICE_ATTR(use_carrier, S_IRUGO | S_IWUSR, bonding_show_carrier, bonding_store_carrier);
1259
1260
1261 /*
1262  * Show and set currently active_slave.
1263  */
1264 static ssize_t bonding_show_active_slave(struct device *d,
1265                                          struct device_attribute *attr,
1266                                          char *buf)
1267 {
1268         struct slave *curr;
1269         struct bonding *bond = to_bond(d);
1270         int count = 0;
1271
1272         read_lock(&bond->curr_slave_lock);
1273         curr = bond->curr_active_slave;
1274         read_unlock(&bond->curr_slave_lock);
1275
1276         if (USES_PRIMARY(bond->params.mode) && curr)
1277                 count = sprintf(buf, "%s\n", curr->dev->name);
1278         return count;
1279 }
1280
1281 static ssize_t bonding_store_active_slave(struct device *d,
1282                                           struct device_attribute *attr,
1283                                           const char *buf, size_t count)
1284 {
1285         int i;
1286         struct slave *slave;
1287         struct slave *old_active = NULL;
1288         struct slave *new_active = NULL;
1289         struct bonding *bond = to_bond(d);
1290
1291         rtnl_lock();
1292         read_lock(&bond->lock);
1293         write_lock_bh(&bond->curr_slave_lock);
1294
1295         if (!USES_PRIMARY(bond->params.mode)) {
1296                 printk(KERN_INFO DRV_NAME
1297                        ": %s: Unable to change active slave; %s is in mode %d\n",
1298                        bond->dev->name, bond->dev->name, bond->params.mode);
1299         } else {
1300                 bond_for_each_slave(bond, slave, i) {
1301                         if (strnicmp
1302                             (slave->dev->name, buf,
1303                              strlen(slave->dev->name)) == 0) {
1304                                 old_active = bond->curr_active_slave;
1305                                 new_active = slave;
1306                                 if (new_active == old_active) {
1307                                         /* do nothing */
1308                                         printk(KERN_INFO DRV_NAME
1309                                                ": %s: %s is already the current active slave.\n",
1310                                                bond->dev->name, slave->dev->name);
1311                                         goto out;
1312                                 }
1313                                 else {
1314                                         if ((new_active) &&
1315                                             (old_active) &&
1316                                             (new_active->link == BOND_LINK_UP) &&
1317                                             IS_UP(new_active->dev)) {
1318                                                 printk(KERN_INFO DRV_NAME
1319                                                       ": %s: Setting %s as active slave.\n",
1320                                                       bond->dev->name, slave->dev->name);
1321                                                 bond_change_active_slave(bond, new_active);
1322                                         }
1323                                         else {
1324                                                 printk(KERN_INFO DRV_NAME
1325                                                       ": %s: Could not set %s as active slave; "
1326                                                       "either %s is down or the link is down.\n",
1327                                                       bond->dev->name, slave->dev->name,
1328                                                       slave->dev->name);
1329                                         }
1330                                         goto out;
1331                                 }
1332                         }
1333                 }
1334
1335                 /* if we got here, then we didn't match the name of any slave */
1336
1337                 if (strlen(buf) == 0 || buf[0] == '\n') {
1338                         printk(KERN_INFO DRV_NAME
1339                                ": %s: Setting active slave to None.\n",
1340                                bond->dev->name);
1341                         bond->primary_slave = NULL;
1342                                 bond_select_active_slave(bond);
1343                 } else {
1344                         printk(KERN_INFO DRV_NAME
1345                                ": %s: Unable to set %.*s as active slave as it is not a slave.\n",
1346                                bond->dev->name, (int)strlen(buf) - 1, buf);
1347                 }
1348         }
1349 out:
1350         write_unlock_bh(&bond->curr_slave_lock);
1351         read_unlock(&bond->lock);
1352         rtnl_unlock();
1353
1354         return count;
1355
1356 }
1357 static DEVICE_ATTR(active_slave, S_IRUGO | S_IWUSR, bonding_show_active_slave, bonding_store_active_slave);
1358
1359
1360 /*
1361  * Show link status of the bond interface.
1362  */
1363 static ssize_t bonding_show_mii_status(struct device *d,
1364                                        struct device_attribute *attr,
1365                                        char *buf)
1366 {
1367         struct slave *curr;
1368         struct bonding *bond = to_bond(d);
1369
1370         read_lock(&bond->curr_slave_lock);
1371         curr = bond->curr_active_slave;
1372         read_unlock(&bond->curr_slave_lock);
1373
1374         return sprintf(buf, "%s\n", (curr) ? "up" : "down");
1375 }
1376 static DEVICE_ATTR(mii_status, S_IRUGO, bonding_show_mii_status, NULL);
1377
1378
1379 /*
1380  * Show current 802.3ad aggregator ID.
1381  */
1382 static ssize_t bonding_show_ad_aggregator(struct device *d,
1383                                           struct device_attribute *attr,
1384                                           char *buf)
1385 {
1386         int count = 0;
1387         struct bonding *bond = to_bond(d);
1388
1389         if (bond->params.mode == BOND_MODE_8023AD) {
1390                 struct ad_info ad_info;
1391                 count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.aggregator_id);
1392         }
1393
1394         return count;
1395 }
1396 static DEVICE_ATTR(ad_aggregator, S_IRUGO, bonding_show_ad_aggregator, NULL);
1397
1398
1399 /*
1400  * Show number of active 802.3ad ports.
1401  */
1402 static ssize_t bonding_show_ad_num_ports(struct device *d,
1403                                          struct device_attribute *attr,
1404                                          char *buf)
1405 {
1406         int count = 0;
1407         struct bonding *bond = to_bond(d);
1408
1409         if (bond->params.mode == BOND_MODE_8023AD) {
1410                 struct ad_info ad_info;
1411                 count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0: ad_info.ports);
1412         }
1413
1414         return count;
1415 }
1416 static DEVICE_ATTR(ad_num_ports, S_IRUGO, bonding_show_ad_num_ports, NULL);
1417
1418
1419 /*
1420  * Show current 802.3ad actor key.
1421  */
1422 static ssize_t bonding_show_ad_actor_key(struct device *d,
1423                                          struct device_attribute *attr,
1424                                          char *buf)
1425 {
1426         int count = 0;
1427         struct bonding *bond = to_bond(d);
1428
1429         if (bond->params.mode == BOND_MODE_8023AD) {
1430                 struct ad_info ad_info;
1431                 count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.actor_key);
1432         }
1433
1434         return count;
1435 }
1436 static DEVICE_ATTR(ad_actor_key, S_IRUGO, bonding_show_ad_actor_key, NULL);
1437
1438
1439 /*
1440  * Show current 802.3ad partner key.
1441  */
1442 static ssize_t bonding_show_ad_partner_key(struct device *d,
1443                                            struct device_attribute *attr,
1444                                            char *buf)
1445 {
1446         int count = 0;
1447         struct bonding *bond = to_bond(d);
1448
1449         if (bond->params.mode == BOND_MODE_8023AD) {
1450                 struct ad_info ad_info;
1451                 count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.partner_key);
1452         }
1453
1454         return count;
1455 }
1456 static DEVICE_ATTR(ad_partner_key, S_IRUGO, bonding_show_ad_partner_key, NULL);
1457
1458
1459 /*
1460  * Show current 802.3ad partner mac.
1461  */
1462 static ssize_t bonding_show_ad_partner_mac(struct device *d,
1463                                            struct device_attribute *attr,
1464                                            char *buf)
1465 {
1466         int count = 0;
1467         struct bonding *bond = to_bond(d);
1468
1469         if (bond->params.mode == BOND_MODE_8023AD) {
1470                 struct ad_info ad_info;
1471                 if (!bond_3ad_get_active_agg_info(bond, &ad_info)) {
1472                         count = sprintf(buf, "%pM\n", ad_info.partner_system);
1473                 }
1474         }
1475
1476         return count;
1477 }
1478 static DEVICE_ATTR(ad_partner_mac, S_IRUGO, bonding_show_ad_partner_mac, NULL);
1479
1480
1481
1482 static struct attribute *per_bond_attrs[] = {
1483         &dev_attr_slaves.attr,
1484         &dev_attr_mode.attr,
1485         &dev_attr_fail_over_mac.attr,
1486         &dev_attr_arp_validate.attr,
1487         &dev_attr_arp_interval.attr,
1488         &dev_attr_arp_ip_target.attr,
1489         &dev_attr_downdelay.attr,
1490         &dev_attr_updelay.attr,
1491         &dev_attr_lacp_rate.attr,
1492         &dev_attr_ad_select.attr,
1493         &dev_attr_xmit_hash_policy.attr,
1494         &dev_attr_num_grat_arp.attr,
1495         &dev_attr_num_unsol_na.attr,
1496         &dev_attr_miimon.attr,
1497         &dev_attr_primary.attr,
1498         &dev_attr_use_carrier.attr,
1499         &dev_attr_active_slave.attr,
1500         &dev_attr_mii_status.attr,
1501         &dev_attr_ad_aggregator.attr,
1502         &dev_attr_ad_num_ports.attr,
1503         &dev_attr_ad_actor_key.attr,
1504         &dev_attr_ad_partner_key.attr,
1505         &dev_attr_ad_partner_mac.attr,
1506         NULL,
1507 };
1508
1509 static struct attribute_group bonding_group = {
1510         .name = "bonding",
1511         .attrs = per_bond_attrs,
1512 };
1513
1514 /*
1515  * Initialize sysfs.  This sets up the bonding_masters file in
1516  * /sys/class/net.
1517  */
1518 int bond_create_sysfs(void)
1519 {
1520         int ret;
1521
1522         ret = netdev_class_create_file(&class_attr_bonding_masters);
1523         /*
1524          * Permit multiple loads of the module by ignoring failures to
1525          * create the bonding_masters sysfs file.  Bonding devices
1526          * created by second or subsequent loads of the module will
1527          * not be listed in, or controllable by, bonding_masters, but
1528          * will have the usual "bonding" sysfs directory.
1529          *
1530          * This is done to preserve backwards compatibility for
1531          * initscripts/sysconfig, which load bonding multiple times to
1532          * configure multiple bonding devices.
1533          */
1534         if (ret == -EEXIST) {
1535                 /* Is someone being kinky and naming a device bonding_master? */
1536                 if (__dev_get_by_name(&init_net,
1537                                       class_attr_bonding_masters.attr.name))
1538                         printk(KERN_ERR
1539                                "network device named %s already exists in sysfs",
1540                                class_attr_bonding_masters.attr.name);
1541         }
1542
1543         return ret;
1544
1545 }
1546
1547 /*
1548  * Remove /sys/class/net/bonding_masters.
1549  */
1550 void bond_destroy_sysfs(void)
1551 {
1552         netdev_class_remove_file(&class_attr_bonding_masters);
1553 }
1554
1555 /*
1556  * Initialize sysfs for each bond.  This sets up and registers
1557  * the 'bondctl' directory for each individual bond under /sys/class/net.
1558  */
1559 int bond_create_sysfs_entry(struct bonding *bond)
1560 {
1561         struct net_device *dev = bond->dev;
1562         int err;
1563
1564         err = sysfs_create_group(&(dev->dev.kobj), &bonding_group);
1565         if (err) {
1566                 printk(KERN_EMERG "eek! didn't create group!\n");
1567         }
1568
1569         if (expected_refcount < 1)
1570                 expected_refcount = atomic_read(&bond->dev->dev.kobj.kref.refcount);
1571
1572         return err;
1573 }
1574 /*
1575  * Remove sysfs entries for each bond.
1576  */
1577 void bond_destroy_sysfs_entry(struct bonding *bond)
1578 {
1579         struct net_device *dev = bond->dev;
1580
1581         sysfs_remove_group(&(dev->dev.kobj), &bonding_group);
1582 }
1583