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