drivers/net/bonding/bond_sysfs.c

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