netdevice: safe convert to netdev_priv() #part-1
[linux-2.6.git] / 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 *)(netdev_priv(to_net_dev(cd))))
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 ad_select_tbl[];
52 extern struct bond_parm_tbl xmit_hashtype_tbl[];
53 extern struct bond_parm_tbl arp_validate_tbl[];
54 extern struct bond_parm_tbl fail_over_mac_tbl[];
55
56 static int expected_refcount = -1;
57 /*--------------------------- Data Structures -----------------------------*/
58
59 /* Bonding sysfs lock.  Why can't we just use the subsystem lock?
60  * Because kobject_register tries to acquire the subsystem lock.  If
61  * we already hold the lock (which we would if the user was creating
62  * a new bond through the sysfs interface), we deadlock.
63  * This lock is only needed when deleting a bond - we need to make sure
64  * that we don't collide with an ongoing ioctl.
65  */
66
67 struct rw_semaphore bonding_rwsem;
68
69
70
71
72 /*------------------------------ Functions --------------------------------*/
73
74 /*
75  * "show" function for the bond_masters attribute.
76  * The class parameter is ignored.
77  */
78 static ssize_t bonding_show_bonds(struct class *cls, char *buf)
79 {
80         int res = 0;
81         struct bonding *bond;
82
83         down_read(&(bonding_rwsem));
84
85         list_for_each_entry(bond, &bond_dev_list, bond_list) {
86                 if (res > (PAGE_SIZE - IFNAMSIZ)) {
87                         /* not enough space for another interface name */
88                         if ((PAGE_SIZE - res) > 10)
89                                 res = PAGE_SIZE - 10;
90                         res += sprintf(buf + res, "++more++ ");
91                         break;
92                 }
93                 res += sprintf(buf + res, "%s ", bond->dev->name);
94         }
95         if (res)
96                 buf[res-1] = '\n'; /* eat the leftover space */
97         up_read(&(bonding_rwsem));
98         return res;
99 }
100
101 /*
102  * "store" function for the bond_masters attribute.  This is what
103  * creates and deletes entire bonds.
104  *
105  * The class parameter is ignored.
106  *
107  */
108
109 static ssize_t bonding_store_bonds(struct class *cls, const char *buffer, size_t count)
110 {
111         char command[IFNAMSIZ + 1] = {0, };
112         char *ifname;
113         int rv, res = count;
114         struct bonding *bond;
115
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                 printk(KERN_INFO DRV_NAME
124                         ": %s is being created...\n", ifname);
125                 rv = bond_create(ifname, &bonding_defaults);
126                 if (rv) {
127                         printk(KERN_INFO DRV_NAME ": Bond creation failed.\n");
128                         res = rv;
129                 }
130                 goto out;
131         }
132
133         if (command[0] == '-') {
134                 rtnl_lock();
135                 down_write(&bonding_rwsem);
136
137                 list_for_each_entry(bond, &bond_dev_list, bond_list)
138                         if (strnicmp(bond->dev->name, ifname, IFNAMSIZ) == 0) {
139                                 /* check the ref count on the bond's kobject.
140                                  * If it's > expected, then there's a file open,
141                                  * and we have to fail.
142                                  */
143                                 if (atomic_read(&bond->dev->dev.kobj.kref.refcount)
144                                                         > expected_refcount){
145                                         printk(KERN_INFO DRV_NAME
146                                                 ": Unable remove bond %s due to open references.\n",
147                                                 ifname);
148                                         res = -EPERM;
149                                         goto out_unlock;
150                                 }
151                                 printk(KERN_INFO DRV_NAME
152                                         ": %s is being deleted...\n",
153                                         bond->dev->name);
154                                 bond_destroy(bond);
155                                 goto out_unlock;
156                         }
157
158                 printk(KERN_ERR DRV_NAME
159                         ": unable to delete non-existent bond %s\n", ifname);
160                 res = -ENODEV;
161                 goto out_unlock;
162         }
163
164 err_no_cmd:
165         printk(KERN_ERR DRV_NAME
166                 ": no command found in bonding_masters. Use +ifname or -ifname.\n");
167         return -EPERM;
168
169 out_unlock:
170         up_write(&bonding_rwsem);
171         rtnl_unlock();
172
173         /* Always return either count or an error.  If you return 0, you'll
174          * get called forever, which is bad.
175          */
176 out:
177         return res;
178 }
179 /* class attribute for bond_masters file.  This ends up in /sys/class/net */
180 static CLASS_ATTR(bonding_masters,  S_IWUSR | S_IRUGO,
181                   bonding_show_bonds, bonding_store_bonds);
182
183 int bond_create_slave_symlinks(struct net_device *master, struct net_device *slave)
184 {
185         char linkname[IFNAMSIZ+7];
186         int ret = 0;
187
188         /* first, create a link from the slave back to the master */
189         ret = sysfs_create_link(&(slave->dev.kobj), &(master->dev.kobj),
190                                 "master");
191         if (ret)
192                 return ret;
193         /* next, create a link from the master to the slave */
194         sprintf(linkname,"slave_%s",slave->name);
195         ret = sysfs_create_link(&(master->dev.kobj), &(slave->dev.kobj),
196                                 linkname);
197         return ret;
198
199 }
200
201 void bond_destroy_slave_symlinks(struct net_device *master, struct net_device *slave)
202 {
203         char linkname[IFNAMSIZ+7];
204
205         sysfs_remove_link(&(slave->dev.kobj), "master");
206         sprintf(linkname,"slave_%s",slave->name);
207         sysfs_remove_link(&(master->dev.kobj), linkname);
208 }
209
210
211 /*
212  * Show the slaves in the current bond.
213  */
214 static ssize_t bonding_show_slaves(struct device *d,
215                                    struct device_attribute *attr, char *buf)
216 {
217         struct slave *slave;
218         int i, res = 0;
219         struct bonding *bond = to_bond(d);
220
221         read_lock(&bond->lock);
222         bond_for_each_slave(bond, slave, i) {
223                 if (res > (PAGE_SIZE - IFNAMSIZ)) {
224                         /* not enough space for another interface name */
225                         if ((PAGE_SIZE - res) > 10)
226                                 res = PAGE_SIZE - 10;
227                         res += sprintf(buf + res, "++more++ ");
228                         break;
229                 }
230                 res += sprintf(buf + res, "%s ", slave->dev->name);
231         }
232         read_unlock(&bond->lock);
233         if (res)
234                 buf[res-1] = '\n'; /* eat the leftover space */
235         return res;
236 }
237
238 /*
239  * Set the slaves in the current bond.  The bond interface must be
240  * up for this to succeed.
241  * This function is largely the same flow as bonding_update_bonds().
242  */
243 static ssize_t bonding_store_slaves(struct device *d,
244                                     struct device_attribute *attr,
245                                     const char *buffer, size_t count)
246 {
247         char command[IFNAMSIZ + 1] = { 0, };
248         char *ifname;
249         int i, res, found, ret = count;
250         u32 original_mtu;
251         struct slave *slave;
252         struct net_device *dev = NULL;
253         struct bonding *bond = to_bond(d);
254
255         /* Quick sanity check -- is the bond interface up? */
256         if (!(bond->dev->flags & IFF_UP)) {
257                 printk(KERN_WARNING DRV_NAME
258                        ": %s: doing slave updates when interface is down.\n",
259                        bond->dev->name);
260         }
261
262         /* Note:  We can't hold bond->lock here, as bond_create grabs it. */
263
264         rtnl_lock();
265         down_write(&(bonding_rwsem));
266
267         sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
268         ifname = command + 1;
269         if ((strlen(command) <= 1) ||
270             !dev_valid_name(ifname))
271                 goto err_no_cmd;
272
273         if (command[0] == '+') {
274
275                 /* Got a slave name in ifname.  Is it already in the list? */
276                 found = 0;
277                 read_lock(&bond->lock);
278                 bond_for_each_slave(bond, slave, i)
279                         if (strnicmp(slave->dev->name, ifname, IFNAMSIZ) == 0) {
280                                 printk(KERN_ERR DRV_NAME
281                                        ": %s: Interface %s is already enslaved!\n",
282                                        bond->dev->name, ifname);
283                                 ret = -EPERM;
284                                 read_unlock(&bond->lock);
285                                 goto out;
286                         }
287
288                 read_unlock(&bond->lock);
289                 printk(KERN_INFO DRV_NAME ": %s: Adding slave %s.\n",
290                        bond->dev->name, ifname);
291                 dev = dev_get_by_name(&init_net, ifname);
292                 if (!dev) {
293                         printk(KERN_INFO DRV_NAME
294                                ": %s: Interface %s does not exist!\n",
295                                bond->dev->name, ifname);
296                         ret = -EPERM;
297                         goto out;
298                 }
299                 else
300                         dev_put(dev);
301
302                 if (dev->flags & IFF_UP) {
303                         printk(KERN_ERR DRV_NAME
304                                ": %s: Error: Unable to enslave %s "
305                                "because it is already up.\n",
306                                bond->dev->name, dev->name);
307                         ret = -EPERM;
308                         goto out;
309                 }
310                 /* If this is the first slave, then we need to set
311                    the master's hardware address to be the same as the
312                    slave's. */
313                 if (!(*((u32 *) & (bond->dev->dev_addr[0])))) {
314                         memcpy(bond->dev->dev_addr, dev->dev_addr,
315                                dev->addr_len);
316                 }
317
318                 /* Set the slave's MTU to match the bond */
319                 original_mtu = dev->mtu;
320                 if (dev->mtu != bond->dev->mtu) {
321                         if (dev->change_mtu) {
322                                 res = dev->change_mtu(dev,
323                                                       bond->dev->mtu);
324                                 if (res) {
325                                         ret = res;
326                                         goto out;
327                                 }
328                         } else {
329                                 dev->mtu = bond->dev->mtu;
330                         }
331                 }
332                 res = bond_enslave(bond->dev, dev);
333                 bond_for_each_slave(bond, slave, i)
334                         if (strnicmp(slave->dev->name, ifname, IFNAMSIZ) == 0)
335                                 slave->original_mtu = original_mtu;
336                 if (res) {
337                         ret = res;
338                 }
339                 goto out;
340         }
341
342         if (command[0] == '-') {
343                 dev = NULL;
344                 original_mtu = 0;
345                 bond_for_each_slave(bond, slave, i)
346                         if (strnicmp(slave->dev->name, ifname, IFNAMSIZ) == 0) {
347                                 dev = slave->dev;
348                                 original_mtu = slave->original_mtu;
349                                 break;
350                         }
351                 if (dev) {
352                         printk(KERN_INFO DRV_NAME ": %s: Removing slave %s\n",
353                                 bond->dev->name, dev->name);
354                                 res = bond_release(bond->dev, dev);
355                         if (res) {
356                                 ret = res;
357                                 goto out;
358                         }
359                         /* set the slave MTU to the default */
360                         if (dev->change_mtu) {
361                                 dev->change_mtu(dev, original_mtu);
362                         } else {
363                                 dev->mtu = original_mtu;
364                         }
365                 }
366                 else {
367                         printk(KERN_ERR DRV_NAME ": unable to remove non-existent slave %s for bond %s.\n",
368                                 ifname, bond->dev->name);
369                         ret = -ENODEV;
370                 }
371                 goto out;
372         }
373
374 err_no_cmd:
375         printk(KERN_ERR DRV_NAME ": no command found in slaves file for bond %s. Use +ifname or -ifname.\n", bond->dev->name);
376         ret = -EPERM;
377
378 out:
379         up_write(&(bonding_rwsem));
380         rtnl_unlock();
381         return ret;
382 }
383
384 static DEVICE_ATTR(slaves, S_IRUGO | S_IWUSR, bonding_show_slaves, bonding_store_slaves);
385
386 /*
387  * Show and set the bonding mode.  The bond interface must be down to
388  * change the mode.
389  */
390 static ssize_t bonding_show_mode(struct device *d,
391                                  struct device_attribute *attr, char *buf)
392 {
393         struct bonding *bond = to_bond(d);
394
395         return sprintf(buf, "%s %d\n",
396                         bond_mode_tbl[bond->params.mode].modename,
397                         bond->params.mode);
398 }
399
400 static ssize_t bonding_store_mode(struct device *d,
401                                   struct device_attribute *attr,
402                                   const char *buf, size_t count)
403 {
404         int new_value, ret = count;
405         struct bonding *bond = to_bond(d);
406
407         if (bond->dev->flags & IFF_UP) {
408                 printk(KERN_ERR DRV_NAME
409                        ": unable to update mode of %s because interface is up.\n",
410                        bond->dev->name);
411                 ret = -EPERM;
412                 goto out;
413         }
414
415         new_value = bond_parse_parm(buf, bond_mode_tbl);
416         if (new_value < 0)  {
417                 printk(KERN_ERR DRV_NAME
418                        ": %s: Ignoring invalid mode value %.*s.\n",
419                        bond->dev->name,
420                        (int)strlen(buf) - 1, buf);
421                 ret = -EINVAL;
422                 goto out;
423         } else {
424                 if (bond->params.mode == BOND_MODE_8023AD)
425                         bond_unset_master_3ad_flags(bond);
426
427                 if (bond->params.mode == BOND_MODE_ALB)
428                         bond_unset_master_alb_flags(bond);
429
430                 bond->params.mode = new_value;
431                 bond_set_mode_ops(bond, bond->params.mode);
432                 printk(KERN_INFO DRV_NAME ": %s: setting mode to %s (%d).\n",
433                         bond->dev->name, bond_mode_tbl[new_value].modename, new_value);
434         }
435 out:
436         return ret;
437 }
438 static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR, bonding_show_mode, bonding_store_mode);
439
440 /*
441  * Show and set the bonding transmit hash method.  The bond interface must be down to
442  * change the xmit hash policy.
443  */
444 static ssize_t bonding_show_xmit_hash(struct device *d,
445                                       struct device_attribute *attr,
446                                       char *buf)
447 {
448         struct bonding *bond = to_bond(d);
449
450         return sprintf(buf, "%s %d\n",
451                        xmit_hashtype_tbl[bond->params.xmit_policy].modename,
452                        bond->params.xmit_policy);
453 }
454
455 static ssize_t bonding_store_xmit_hash(struct device *d,
456                                        struct device_attribute *attr,
457                                        const char *buf, size_t count)
458 {
459         int new_value, ret = count;
460         struct bonding *bond = to_bond(d);
461
462         if (bond->dev->flags & IFF_UP) {
463                 printk(KERN_ERR DRV_NAME
464                        "%s: Interface is up. Unable to update xmit policy.\n",
465                        bond->dev->name);
466                 ret = -EPERM;
467                 goto out;
468         }
469
470         new_value = bond_parse_parm(buf, xmit_hashtype_tbl);
471         if (new_value < 0)  {
472                 printk(KERN_ERR DRV_NAME
473                        ": %s: Ignoring invalid xmit hash policy value %.*s.\n",
474                        bond->dev->name,
475                        (int)strlen(buf) - 1, buf);
476                 ret = -EINVAL;
477                 goto out;
478         } else {
479                 bond->params.xmit_policy = new_value;
480                 bond_set_mode_ops(bond, bond->params.mode);
481                 printk(KERN_INFO DRV_NAME ": %s: setting xmit hash policy to %s (%d).\n",
482                         bond->dev->name, xmit_hashtype_tbl[new_value].modename, new_value);
483         }
484 out:
485         return ret;
486 }
487 static DEVICE_ATTR(xmit_hash_policy, S_IRUGO | S_IWUSR, bonding_show_xmit_hash, bonding_store_xmit_hash);
488
489 /*
490  * Show and set arp_validate.
491  */
492 static ssize_t bonding_show_arp_validate(struct device *d,
493                                          struct device_attribute *attr,
494                                          char *buf)
495 {
496         struct bonding *bond = to_bond(d);
497
498         return sprintf(buf, "%s %d\n",
499                        arp_validate_tbl[bond->params.arp_validate].modename,
500                        bond->params.arp_validate);
501 }
502
503 static ssize_t bonding_store_arp_validate(struct device *d,
504                                           struct device_attribute *attr,
505                                           const char *buf, size_t count)
506 {
507         int new_value;
508         struct bonding *bond = to_bond(d);
509
510         new_value = bond_parse_parm(buf, arp_validate_tbl);
511         if (new_value < 0) {
512                 printk(KERN_ERR DRV_NAME
513                        ": %s: Ignoring invalid arp_validate value %s\n",
514                        bond->dev->name, buf);
515                 return -EINVAL;
516         }
517         if (new_value && (bond->params.mode != BOND_MODE_ACTIVEBACKUP)) {
518                 printk(KERN_ERR DRV_NAME
519                        ": %s: arp_validate only supported in active-backup mode.\n",
520                        bond->dev->name);
521                 return -EINVAL;
522         }
523         printk(KERN_INFO DRV_NAME ": %s: setting arp_validate to %s (%d).\n",
524                bond->dev->name, arp_validate_tbl[new_value].modename,
525                new_value);
526
527         if (!bond->params.arp_validate && new_value) {
528                 bond_register_arp(bond);
529         } else if (bond->params.arp_validate && !new_value) {
530                 bond_unregister_arp(bond);
531         }
532
533         bond->params.arp_validate = new_value;
534
535         return count;
536 }
537
538 static DEVICE_ATTR(arp_validate, S_IRUGO | S_IWUSR, bonding_show_arp_validate, bonding_store_arp_validate);
539
540 /*
541  * Show and store fail_over_mac.  User only allowed to change the
542  * value when there are no slaves.
543  */
544 static ssize_t bonding_show_fail_over_mac(struct device *d, struct device_attribute *attr, char *buf)
545 {
546         struct bonding *bond = to_bond(d);
547
548         return sprintf(buf, "%s %d\n",
549                        fail_over_mac_tbl[bond->params.fail_over_mac].modename,
550                        bond->params.fail_over_mac);
551 }
552
553 static ssize_t bonding_store_fail_over_mac(struct device *d, struct device_attribute *attr, const char *buf, size_t count)
554 {
555         int new_value;
556         struct bonding *bond = to_bond(d);
557
558         if (bond->slave_cnt != 0) {
559                 printk(KERN_ERR DRV_NAME
560                        ": %s: Can't alter fail_over_mac with slaves in bond.\n",
561                        bond->dev->name);
562                 return -EPERM;
563         }
564
565         new_value = bond_parse_parm(buf, fail_over_mac_tbl);
566         if (new_value < 0) {
567                 printk(KERN_ERR DRV_NAME
568                        ": %s: Ignoring invalid fail_over_mac value %s.\n",
569                        bond->dev->name, buf);
570                 return -EINVAL;
571         }
572
573         bond->params.fail_over_mac = new_value;
574         printk(KERN_INFO DRV_NAME ": %s: Setting fail_over_mac to %s (%d).\n",
575                bond->dev->name, fail_over_mac_tbl[new_value].modename,
576                new_value);
577
578         return count;
579 }
580
581 static DEVICE_ATTR(fail_over_mac, S_IRUGO | S_IWUSR, bonding_show_fail_over_mac, bonding_store_fail_over_mac);
582
583 /*
584  * Show and set the arp timer interval.  There are two tricky bits
585  * here.  First, if ARP monitoring is activated, then we must disable
586  * MII monitoring.  Second, if the ARP timer isn't running, we must
587  * start it.
588  */
589 static ssize_t bonding_show_arp_interval(struct device *d,
590                                          struct device_attribute *attr,
591                                          char *buf)
592 {
593         struct bonding *bond = to_bond(d);
594
595         return sprintf(buf, "%d\n", bond->params.arp_interval);
596 }
597
598 static ssize_t bonding_store_arp_interval(struct device *d,
599                                           struct device_attribute *attr,
600                                           const char *buf, size_t count)
601 {
602         int new_value, ret = count;
603         struct bonding *bond = to_bond(d);
604
605         if (sscanf(buf, "%d", &new_value) != 1) {
606                 printk(KERN_ERR DRV_NAME
607                        ": %s: no arp_interval value specified.\n",
608                        bond->dev->name);
609                 ret = -EINVAL;
610                 goto out;
611         }
612         if (new_value < 0) {
613                 printk(KERN_ERR DRV_NAME
614                        ": %s: Invalid arp_interval value %d not in range 1-%d; rejected.\n",
615                        bond->dev->name, new_value, INT_MAX);
616                 ret = -EINVAL;
617                 goto out;
618         }
619
620         printk(KERN_INFO DRV_NAME
621                ": %s: Setting ARP monitoring interval to %d.\n",
622                bond->dev->name, new_value);
623         bond->params.arp_interval = new_value;
624         if (bond->params.arp_interval)
625                 bond->dev->priv_flags |= IFF_MASTER_ARPMON;
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, "%pI4 ",
679                                        &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 %pI4 specified for addition\n",
702                                bond->dev->name, &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 %pI4 is already present\n",
711                                        bond->dev->name, &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 %pI4.\n",
720                                        bond->dev->name, &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 %pI4 specified for removal\n",
738                                bond->dev->name, &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 %pI4.\n",
747                                        bond->dev->name, &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 %pI4.\n",
755                                bond->dev->name, &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 static ssize_t bonding_show_ad_select(struct device *d,
949                                       struct device_attribute *attr,
950                                       char *buf)
951 {
952         struct bonding *bond = to_bond(d);
953
954         return sprintf(buf, "%s %d\n",
955                 ad_select_tbl[bond->params.ad_select].modename,
956                 bond->params.ad_select);
957 }
958
959
960 static ssize_t bonding_store_ad_select(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 (bond->dev->flags & IFF_UP) {
968                 printk(KERN_ERR DRV_NAME
969                        ": %s: Unable to update ad_select because interface "
970                        "is up.\n", bond->dev->name);
971                 ret = -EPERM;
972                 goto out;
973         }
974
975         new_value = bond_parse_parm(buf, ad_select_tbl);
976
977         if (new_value != -1) {
978                 bond->params.ad_select = new_value;
979                 printk(KERN_INFO DRV_NAME
980                        ": %s: Setting ad_select to %s (%d).\n",
981                        bond->dev->name, ad_select_tbl[new_value].modename,
982                        new_value);
983         } else {
984                 printk(KERN_ERR DRV_NAME
985                        ": %s: Ignoring invalid ad_select value %.*s.\n",
986                        bond->dev->name, (int)strlen(buf) - 1, buf);
987                 ret = -EINVAL;
988         }
989 out:
990         return ret;
991 }
992
993 static DEVICE_ATTR(ad_select, S_IRUGO | S_IWUSR, bonding_show_ad_select, bonding_store_ad_select);
994
995 /*
996  * Show and set the number of grat ARP to send after a failover event.
997  */
998 static ssize_t bonding_show_n_grat_arp(struct device *d,
999                                    struct device_attribute *attr,
1000                                    char *buf)
1001 {
1002         struct bonding *bond = to_bond(d);
1003
1004         return sprintf(buf, "%d\n", bond->params.num_grat_arp);
1005 }
1006
1007 static ssize_t bonding_store_n_grat_arp(struct device *d,
1008                                     struct device_attribute *attr,
1009                                     const char *buf, size_t count)
1010 {
1011         int new_value, ret = count;
1012         struct bonding *bond = to_bond(d);
1013
1014         if (sscanf(buf, "%d", &new_value) != 1) {
1015                 printk(KERN_ERR DRV_NAME
1016                        ": %s: no num_grat_arp value specified.\n",
1017                        bond->dev->name);
1018                 ret = -EINVAL;
1019                 goto out;
1020         }
1021         if (new_value < 0 || new_value > 255) {
1022                 printk(KERN_ERR DRV_NAME
1023                        ": %s: Invalid num_grat_arp value %d not in range 0-255; rejected.\n",
1024                        bond->dev->name, new_value);
1025                 ret = -EINVAL;
1026                 goto out;
1027         } else {
1028                 bond->params.num_grat_arp = new_value;
1029         }
1030 out:
1031         return ret;
1032 }
1033 static DEVICE_ATTR(num_grat_arp, S_IRUGO | S_IWUSR, bonding_show_n_grat_arp, bonding_store_n_grat_arp);
1034
1035 /*
1036  * Show and set the number of unsolicted NA's to send after a failover event.
1037  */
1038 static ssize_t bonding_show_n_unsol_na(struct device *d,
1039                                        struct device_attribute *attr,
1040                                        char *buf)
1041 {
1042         struct bonding *bond = to_bond(d);
1043
1044         return sprintf(buf, "%d\n", bond->params.num_unsol_na);
1045 }
1046
1047 static ssize_t bonding_store_n_unsol_na(struct device *d,
1048                                         struct device_attribute *attr,
1049                                         const char *buf, size_t count)
1050 {
1051         int new_value, ret = count;
1052         struct bonding *bond = to_bond(d);
1053
1054         if (sscanf(buf, "%d", &new_value) != 1) {
1055                 printk(KERN_ERR DRV_NAME
1056                        ": %s: no num_unsol_na value specified.\n",
1057                        bond->dev->name);
1058                 ret = -EINVAL;
1059                 goto out;
1060         }
1061         if (new_value < 0 || new_value > 255) {
1062                 printk(KERN_ERR DRV_NAME
1063                        ": %s: Invalid num_unsol_na value %d not in range 0-255; rejected.\n",
1064                        bond->dev->name, new_value);
1065                 ret = -EINVAL;
1066                 goto out;
1067         } else {
1068                 bond->params.num_unsol_na = new_value;
1069         }
1070 out:
1071         return ret;
1072 }
1073 static DEVICE_ATTR(num_unsol_na, S_IRUGO | S_IWUSR, bonding_show_n_unsol_na, bonding_store_n_unsol_na);
1074
1075 /*
1076  * Show and set the MII monitor interval.  There are two tricky bits
1077  * here.  First, if MII monitoring is activated, then we must disable
1078  * ARP monitoring.  Second, if the timer isn't running, we must
1079  * start it.
1080  */
1081 static ssize_t bonding_show_miimon(struct device *d,
1082                                    struct device_attribute *attr,
1083                                    char *buf)
1084 {
1085         struct bonding *bond = to_bond(d);
1086
1087         return sprintf(buf, "%d\n", bond->params.miimon);
1088 }
1089
1090 static ssize_t bonding_store_miimon(struct device *d,
1091                                     struct device_attribute *attr,
1092                                     const char *buf, size_t count)
1093 {
1094         int new_value, ret = count;
1095         struct bonding *bond = to_bond(d);
1096
1097         if (sscanf(buf, "%d", &new_value) != 1) {
1098                 printk(KERN_ERR DRV_NAME
1099                        ": %s: no miimon value specified.\n",
1100                        bond->dev->name);
1101                 ret = -EINVAL;
1102                 goto out;
1103         }
1104         if (new_value < 0) {
1105                 printk(KERN_ERR DRV_NAME
1106                        ": %s: Invalid miimon value %d not in range %d-%d; rejected.\n",
1107                        bond->dev->name, new_value, 1, INT_MAX);
1108                 ret = -EINVAL;
1109                 goto out;
1110         } else {
1111                 printk(KERN_INFO DRV_NAME
1112                        ": %s: Setting MII monitoring interval to %d.\n",
1113                        bond->dev->name, new_value);
1114                 bond->params.miimon = new_value;
1115                 if(bond->params.updelay)
1116                         printk(KERN_INFO DRV_NAME
1117                               ": %s: Note: Updating updelay (to %d) "
1118                               "since it is a multiple of the miimon value.\n",
1119                               bond->dev->name,
1120                               bond->params.updelay * bond->params.miimon);
1121                 if(bond->params.downdelay)
1122                         printk(KERN_INFO DRV_NAME
1123                               ": %s: Note: Updating downdelay (to %d) "
1124                               "since it is a multiple of the miimon value.\n",
1125                               bond->dev->name,
1126                               bond->params.downdelay * bond->params.miimon);
1127                 if (bond->params.arp_interval) {
1128                         printk(KERN_INFO DRV_NAME
1129                                ": %s: MII monitoring cannot be used with "
1130                                "ARP monitoring. Disabling ARP monitoring...\n",
1131                                bond->dev->name);
1132                         bond->params.arp_interval = 0;
1133                         bond->dev->priv_flags &= ~IFF_MASTER_ARPMON;
1134                         if (bond->params.arp_validate) {
1135                                 bond_unregister_arp(bond);
1136                                 bond->params.arp_validate =
1137                                         BOND_ARP_VALIDATE_NONE;
1138                         }
1139                         if (delayed_work_pending(&bond->arp_work)) {
1140                                 cancel_delayed_work(&bond->arp_work);
1141                                 flush_workqueue(bond->wq);
1142                         }
1143                 }
1144
1145                 if (bond->dev->flags & IFF_UP) {
1146                         /* If the interface is up, we may need to fire off
1147                          * the MII timer. If the interface is down, the
1148                          * timer will get fired off when the open function
1149                          * is called.
1150                          */
1151                         if (!delayed_work_pending(&bond->mii_work)) {
1152                                 INIT_DELAYED_WORK(&bond->mii_work,
1153                                                   bond_mii_monitor);
1154                                 queue_delayed_work(bond->wq,
1155                                                    &bond->mii_work, 0);
1156                         }
1157                 }
1158         }
1159 out:
1160         return ret;
1161 }
1162 static DEVICE_ATTR(miimon, S_IRUGO | S_IWUSR, bonding_show_miimon, bonding_store_miimon);
1163
1164 /*
1165  * Show and set the primary slave.  The store function is much
1166  * simpler than bonding_store_slaves function because it only needs to
1167  * handle one interface name.
1168  * The bond must be a mode that supports a primary for this be
1169  * set.
1170  */
1171 static ssize_t bonding_show_primary(struct device *d,
1172                                     struct device_attribute *attr,
1173                                     char *buf)
1174 {
1175         int count = 0;
1176         struct bonding *bond = to_bond(d);
1177
1178         if (bond->primary_slave)
1179                 count = sprintf(buf, "%s\n", bond->primary_slave->dev->name);
1180
1181         return count;
1182 }
1183
1184 static ssize_t bonding_store_primary(struct device *d,
1185                                      struct device_attribute *attr,
1186                                      const char *buf, size_t count)
1187 {
1188         int i;
1189         struct slave *slave;
1190         struct bonding *bond = to_bond(d);
1191
1192         rtnl_lock();
1193         read_lock(&bond->lock);
1194         write_lock_bh(&bond->curr_slave_lock);
1195
1196         if (!USES_PRIMARY(bond->params.mode)) {
1197                 printk(KERN_INFO DRV_NAME
1198                        ": %s: Unable to set primary slave; %s is in mode %d\n",
1199                        bond->dev->name, bond->dev->name, bond->params.mode);
1200         } else {
1201                 bond_for_each_slave(bond, slave, i) {
1202                         if (strnicmp
1203                             (slave->dev->name, buf,
1204                              strlen(slave->dev->name)) == 0) {
1205                                 printk(KERN_INFO DRV_NAME
1206                                        ": %s: Setting %s as primary slave.\n",
1207                                        bond->dev->name, slave->dev->name);
1208                                 bond->primary_slave = slave;
1209                                 bond_select_active_slave(bond);
1210                                 goto out;
1211                         }
1212                 }
1213
1214                 /* if we got here, then we didn't match the name of any slave */
1215
1216                 if (strlen(buf) == 0 || buf[0] == '\n') {
1217                         printk(KERN_INFO DRV_NAME
1218                                ": %s: Setting primary slave to None.\n",
1219                                bond->dev->name);
1220                         bond->primary_slave = NULL;
1221                                 bond_select_active_slave(bond);
1222                 } else {
1223                         printk(KERN_INFO DRV_NAME
1224                                ": %s: Unable to set %.*s as primary slave as it is not a slave.\n",
1225                                bond->dev->name, (int)strlen(buf) - 1, buf);
1226                 }
1227         }
1228 out:
1229         write_unlock_bh(&bond->curr_slave_lock);
1230         read_unlock(&bond->lock);
1231         rtnl_unlock();
1232
1233         return count;
1234 }
1235 static DEVICE_ATTR(primary, S_IRUGO | S_IWUSR, bonding_show_primary, bonding_store_primary);
1236
1237 /*
1238  * Show and set the use_carrier flag.
1239  */
1240 static ssize_t bonding_show_carrier(struct device *d,
1241                                     struct device_attribute *attr,
1242                                     char *buf)
1243 {
1244         struct bonding *bond = to_bond(d);
1245
1246         return sprintf(buf, "%d\n", bond->params.use_carrier);
1247 }
1248
1249 static ssize_t bonding_store_carrier(struct device *d,
1250                                      struct device_attribute *attr,
1251                                      const char *buf, size_t count)
1252 {
1253         int new_value, ret = count;
1254         struct bonding *bond = to_bond(d);
1255
1256
1257         if (sscanf(buf, "%d", &new_value) != 1) {
1258                 printk(KERN_ERR DRV_NAME
1259                        ": %s: no use_carrier value specified.\n",
1260                        bond->dev->name);
1261                 ret = -EINVAL;
1262                 goto out;
1263         }
1264         if ((new_value == 0) || (new_value == 1)) {
1265                 bond->params.use_carrier = new_value;
1266                 printk(KERN_INFO DRV_NAME ": %s: Setting use_carrier to %d.\n",
1267                        bond->dev->name, new_value);
1268         } else {
1269                 printk(KERN_INFO DRV_NAME
1270                        ": %s: Ignoring invalid use_carrier value %d.\n",
1271                        bond->dev->name, new_value);
1272         }
1273 out:
1274         return count;
1275 }
1276 static DEVICE_ATTR(use_carrier, S_IRUGO | S_IWUSR, bonding_show_carrier, bonding_store_carrier);
1277
1278
1279 /*
1280  * Show and set currently active_slave.
1281  */
1282 static ssize_t bonding_show_active_slave(struct device *d,
1283                                          struct device_attribute *attr,
1284                                          char *buf)
1285 {
1286         struct slave *curr;
1287         struct bonding *bond = to_bond(d);
1288         int count = 0;
1289
1290         read_lock(&bond->curr_slave_lock);
1291         curr = bond->curr_active_slave;
1292         read_unlock(&bond->curr_slave_lock);
1293
1294         if (USES_PRIMARY(bond->params.mode) && curr)
1295                 count = sprintf(buf, "%s\n", curr->dev->name);
1296         return count;
1297 }
1298
1299 static ssize_t bonding_store_active_slave(struct device *d,
1300                                           struct device_attribute *attr,
1301                                           const char *buf, size_t count)
1302 {
1303         int i;
1304         struct slave *slave;
1305         struct slave *old_active = NULL;
1306         struct slave *new_active = NULL;
1307         struct bonding *bond = to_bond(d);
1308
1309         rtnl_lock();
1310         read_lock(&bond->lock);
1311         write_lock_bh(&bond->curr_slave_lock);
1312
1313         if (!USES_PRIMARY(bond->params.mode)) {
1314                 printk(KERN_INFO DRV_NAME
1315                        ": %s: Unable to change active slave; %s is in mode %d\n",
1316                        bond->dev->name, bond->dev->name, bond->params.mode);
1317         } else {
1318                 bond_for_each_slave(bond, slave, i) {
1319                         if (strnicmp
1320                             (slave->dev->name, buf,
1321                              strlen(slave->dev->name)) == 0) {
1322                                 old_active = bond->curr_active_slave;
1323                                 new_active = slave;
1324                                 if (new_active == old_active) {
1325                                         /* do nothing */
1326                                         printk(KERN_INFO DRV_NAME
1327                                                ": %s: %s is already the current active slave.\n",
1328                                                bond->dev->name, slave->dev->name);
1329                                         goto out;
1330                                 }
1331                                 else {
1332                                         if ((new_active) &&
1333                                             (old_active) &&
1334                                             (new_active->link == BOND_LINK_UP) &&
1335                                             IS_UP(new_active->dev)) {
1336                                                 printk(KERN_INFO DRV_NAME
1337                                                       ": %s: Setting %s as active slave.\n",
1338                                                       bond->dev->name, slave->dev->name);
1339                                                 bond_change_active_slave(bond, new_active);
1340                                         }
1341                                         else {
1342                                                 printk(KERN_INFO DRV_NAME
1343                                                       ": %s: Could not set %s as active slave; "
1344                                                       "either %s is down or the link is down.\n",
1345                                                       bond->dev->name, slave->dev->name,
1346                                                       slave->dev->name);
1347                                         }
1348                                         goto out;
1349                                 }
1350                         }
1351                 }
1352
1353                 /* if we got here, then we didn't match the name of any slave */
1354
1355                 if (strlen(buf) == 0 || buf[0] == '\n') {
1356                         printk(KERN_INFO DRV_NAME
1357                                ": %s: Setting active slave to None.\n",
1358                                bond->dev->name);
1359                         bond->primary_slave = NULL;
1360                                 bond_select_active_slave(bond);
1361                 } else {
1362                         printk(KERN_INFO DRV_NAME
1363                                ": %s: Unable to set %.*s as active slave as it is not a slave.\n",
1364                                bond->dev->name, (int)strlen(buf) - 1, buf);
1365                 }
1366         }
1367 out:
1368         write_unlock_bh(&bond->curr_slave_lock);
1369         read_unlock(&bond->lock);
1370         rtnl_unlock();
1371
1372         return count;
1373
1374 }
1375 static DEVICE_ATTR(active_slave, S_IRUGO | S_IWUSR, bonding_show_active_slave, bonding_store_active_slave);
1376
1377
1378 /*
1379  * Show link status of the bond interface.
1380  */
1381 static ssize_t bonding_show_mii_status(struct device *d,
1382                                        struct device_attribute *attr,
1383                                        char *buf)
1384 {
1385         struct slave *curr;
1386         struct bonding *bond = to_bond(d);
1387
1388         read_lock(&bond->curr_slave_lock);
1389         curr = bond->curr_active_slave;
1390         read_unlock(&bond->curr_slave_lock);
1391
1392         return sprintf(buf, "%s\n", (curr) ? "up" : "down");
1393 }
1394 static DEVICE_ATTR(mii_status, S_IRUGO, bonding_show_mii_status, NULL);
1395
1396
1397 /*
1398  * Show current 802.3ad aggregator ID.
1399  */
1400 static ssize_t bonding_show_ad_aggregator(struct device *d,
1401                                           struct device_attribute *attr,
1402                                           char *buf)
1403 {
1404         int count = 0;
1405         struct bonding *bond = to_bond(d);
1406
1407         if (bond->params.mode == BOND_MODE_8023AD) {
1408                 struct ad_info ad_info;
1409                 count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.aggregator_id);
1410         }
1411
1412         return count;
1413 }
1414 static DEVICE_ATTR(ad_aggregator, S_IRUGO, bonding_show_ad_aggregator, NULL);
1415
1416
1417 /*
1418  * Show number of active 802.3ad ports.
1419  */
1420 static ssize_t bonding_show_ad_num_ports(struct device *d,
1421                                          struct device_attribute *attr,
1422                                          char *buf)
1423 {
1424         int count = 0;
1425         struct bonding *bond = to_bond(d);
1426
1427         if (bond->params.mode == BOND_MODE_8023AD) {
1428                 struct ad_info ad_info;
1429                 count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0: ad_info.ports);
1430         }
1431
1432         return count;
1433 }
1434 static DEVICE_ATTR(ad_num_ports, S_IRUGO, bonding_show_ad_num_ports, NULL);
1435
1436
1437 /*
1438  * Show current 802.3ad actor key.
1439  */
1440 static ssize_t bonding_show_ad_actor_key(struct device *d,
1441                                          struct device_attribute *attr,
1442                                          char *buf)
1443 {
1444         int count = 0;
1445         struct bonding *bond = to_bond(d);
1446
1447         if (bond->params.mode == BOND_MODE_8023AD) {
1448                 struct ad_info ad_info;
1449                 count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.actor_key);
1450         }
1451
1452         return count;
1453 }
1454 static DEVICE_ATTR(ad_actor_key, S_IRUGO, bonding_show_ad_actor_key, NULL);
1455
1456
1457 /*
1458  * Show current 802.3ad partner key.
1459  */
1460 static ssize_t bonding_show_ad_partner_key(struct device *d,
1461                                            struct device_attribute *attr,
1462                                            char *buf)
1463 {
1464         int count = 0;
1465         struct bonding *bond = to_bond(d);
1466
1467         if (bond->params.mode == BOND_MODE_8023AD) {
1468                 struct ad_info ad_info;
1469                 count = sprintf(buf, "%d\n", (bond_3ad_get_active_agg_info(bond, &ad_info)) ?  0 : ad_info.partner_key);
1470         }
1471
1472         return count;
1473 }
1474 static DEVICE_ATTR(ad_partner_key, S_IRUGO, bonding_show_ad_partner_key, NULL);
1475
1476
1477 /*
1478  * Show current 802.3ad partner mac.
1479  */
1480 static ssize_t bonding_show_ad_partner_mac(struct device *d,
1481                                            struct device_attribute *attr,
1482                                            char *buf)
1483 {
1484         int count = 0;
1485         struct bonding *bond = to_bond(d);
1486
1487         if (bond->params.mode == BOND_MODE_8023AD) {
1488                 struct ad_info ad_info;
1489                 if (!bond_3ad_get_active_agg_info(bond, &ad_info)) {
1490                         count = sprintf(buf, "%pM\n", ad_info.partner_system);
1491                 }
1492         }
1493
1494         return count;
1495 }
1496 static DEVICE_ATTR(ad_partner_mac, S_IRUGO, bonding_show_ad_partner_mac, NULL);
1497
1498
1499
1500 static struct attribute *per_bond_attrs[] = {
1501         &dev_attr_slaves.attr,
1502         &dev_attr_mode.attr,
1503         &dev_attr_fail_over_mac.attr,
1504         &dev_attr_arp_validate.attr,
1505         &dev_attr_arp_interval.attr,
1506         &dev_attr_arp_ip_target.attr,
1507         &dev_attr_downdelay.attr,
1508         &dev_attr_updelay.attr,
1509         &dev_attr_lacp_rate.attr,
1510         &dev_attr_ad_select.attr,
1511         &dev_attr_xmit_hash_policy.attr,
1512         &dev_attr_num_grat_arp.attr,
1513         &dev_attr_num_unsol_na.attr,
1514         &dev_attr_miimon.attr,
1515         &dev_attr_primary.attr,
1516         &dev_attr_use_carrier.attr,
1517         &dev_attr_active_slave.attr,
1518         &dev_attr_mii_status.attr,
1519         &dev_attr_ad_aggregator.attr,
1520         &dev_attr_ad_num_ports.attr,
1521         &dev_attr_ad_actor_key.attr,
1522         &dev_attr_ad_partner_key.attr,
1523         &dev_attr_ad_partner_mac.attr,
1524         NULL,
1525 };
1526
1527 static struct attribute_group bonding_group = {
1528         .name = "bonding",
1529         .attrs = per_bond_attrs,
1530 };
1531
1532 /*
1533  * Initialize sysfs.  This sets up the bonding_masters file in
1534  * /sys/class/net.
1535  */
1536 int bond_create_sysfs(void)
1537 {
1538         int ret;
1539
1540         ret = netdev_class_create_file(&class_attr_bonding_masters);
1541         /*
1542          * Permit multiple loads of the module by ignoring failures to
1543          * create the bonding_masters sysfs file.  Bonding devices
1544          * created by second or subsequent loads of the module will
1545          * not be listed in, or controllable by, bonding_masters, but
1546          * will have the usual "bonding" sysfs directory.
1547          *
1548          * This is done to preserve backwards compatibility for
1549          * initscripts/sysconfig, which load bonding multiple times to
1550          * configure multiple bonding devices.
1551          */
1552         if (ret == -EEXIST) {
1553                 /* Is someone being kinky and naming a device bonding_master? */
1554                 if (__dev_get_by_name(&init_net,
1555                                       class_attr_bonding_masters.attr.name))
1556                         printk(KERN_ERR
1557                                "network device named %s already exists in sysfs",
1558                                class_attr_bonding_masters.attr.name);
1559         }
1560
1561         return ret;
1562
1563 }
1564
1565 /*
1566  * Remove /sys/class/net/bonding_masters.
1567  */
1568 void bond_destroy_sysfs(void)
1569 {
1570         netdev_class_remove_file(&class_attr_bonding_masters);
1571 }
1572
1573 /*
1574  * Initialize sysfs for each bond.  This sets up and registers
1575  * the 'bondctl' directory for each individual bond under /sys/class/net.
1576  */
1577 int bond_create_sysfs_entry(struct bonding *bond)
1578 {
1579         struct net_device *dev = bond->dev;
1580         int err;
1581
1582         err = sysfs_create_group(&(dev->dev.kobj), &bonding_group);
1583         if (err) {
1584                 printk(KERN_EMERG "eek! didn't create group!\n");
1585         }
1586
1587         if (expected_refcount < 1)
1588                 expected_refcount = atomic_read(&bond->dev->dev.kobj.kref.refcount);
1589
1590         return err;
1591 }
1592 /*
1593  * Remove sysfs entries for each bond.
1594  */
1595 void bond_destroy_sysfs_entry(struct bonding *bond)
1596 {
1597         struct net_device *dev = bond->dev;
1598
1599         sysfs_remove_group(&(dev->dev.kobj), &bonding_group);
1600 }
1601