drivers/net/bonding/bond_sysfs.c

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