bonding: documentation and code cleanup for resend_igmp
[linux-2.6.git] / drivers / net / bonding / bond_sysfs.c
1 /*
2  * Copyright(c) 2004-2005 Intel Corporation. All rights reserved.
3  *
4  * This program is free software; you can redistribute it and/or modify it
5  * under the terms of the GNU General Public License as published by the
6  * Free Software Foundation; either version 2 of the License, or
7  * (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful, but
10  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * for more details.
13  *
14  * You should have received a copy of the GNU General Public License along
15  * with this program; if not, write to the Free Software Foundation, Inc.,
16  * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
17  *
18  * The full GNU General Public License is included in this distribution in the
19  * file called LICENSE.
20  *
21  */
22
23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/device.h>
28 #include <linux/sched.h>
29 #include <linux/sysdev.h>
30 #include <linux/fs.h>
31 #include <linux/types.h>
32 #include <linux/string.h>
33 #include <linux/netdevice.h>
34 #include <linux/inetdevice.h>
35 #include <linux/in.h>
36 #include <linux/sysfs.h>
37 #include <linux/ctype.h>
38 #include <linux/inet.h>
39 #include <linux/rtnetlink.h>
40 #include <linux/etherdevice.h>
41 #include <net/net_namespace.h>
42 #include <net/netns/generic.h>
43 #include <linux/nsproxy.h>
44
45 #include "bonding.h"
46
47 #define to_dev(obj)     container_of(obj, struct device, kobj)
48 #define to_bond(cd)     ((struct bonding *)(netdev_priv(to_net_dev(cd))))
49
50 /*
51  * "show" function for the bond_masters attribute.
52  * The class parameter is ignored.
53  */
54 static ssize_t bonding_show_bonds(struct class *cls,
55                                   struct class_attribute *attr,
56                                   char *buf)
57 {
58         struct net *net = current->nsproxy->net_ns;
59         struct bond_net *bn = net_generic(net, bond_net_id);
60         int res = 0;
61         struct bonding *bond;
62
63         rtnl_lock();
64
65         list_for_each_entry(bond, &bn->dev_list, bond_list) {
66                 if (res > (PAGE_SIZE - IFNAMSIZ)) {
67                         /* not enough space for another interface name */
68                         if ((PAGE_SIZE - res) > 10)
69                                 res = PAGE_SIZE - 10;
70                         res += sprintf(buf + res, "++more++ ");
71                         break;
72                 }
73                 res += sprintf(buf + res, "%s ", bond->dev->name);
74         }
75         if (res)
76                 buf[res-1] = '\n'; /* eat the leftover space */
77
78         rtnl_unlock();
79         return res;
80 }
81
82 static struct net_device *bond_get_by_name(struct net *net, const char *ifname)
83 {
84         struct bond_net *bn = net_generic(net, bond_net_id);
85         struct bonding *bond;
86
87         list_for_each_entry(bond, &bn->dev_list, bond_list) {
88                 if (strncmp(bond->dev->name, ifname, IFNAMSIZ) == 0)
89                         return bond->dev;
90         }
91         return NULL;
92 }
93
94 /*
95  * "store" function for the bond_masters attribute.  This is what
96  * creates and deletes entire bonds.
97  *
98  * The class parameter is ignored.
99  *
100  */
101
102 static ssize_t bonding_store_bonds(struct class *cls,
103                                    struct class_attribute *attr,
104                                    const char *buffer, size_t count)
105 {
106         struct net *net = current->nsproxy->net_ns;
107         char command[IFNAMSIZ + 1] = {0, };
108         char *ifname;
109         int rv, res = count;
110
111         sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
112         ifname = command + 1;
113         if ((strlen(command) <= 1) ||
114             !dev_valid_name(ifname))
115                 goto err_no_cmd;
116
117         if (command[0] == '+') {
118                 pr_info("%s is being created...\n", ifname);
119                 rv = bond_create(net, ifname);
120                 if (rv) {
121                         if (rv == -EEXIST)
122                                 pr_info("%s already exists.\n", ifname);
123                         else
124                                 pr_info("%s creation failed.\n", ifname);
125                         res = rv;
126                 }
127         } else if (command[0] == '-') {
128                 struct net_device *bond_dev;
129
130                 rtnl_lock();
131                 bond_dev = bond_get_by_name(net, ifname);
132                 if (bond_dev) {
133                         pr_info("%s is being deleted...\n", ifname);
134                         unregister_netdevice(bond_dev);
135                 } else {
136                         pr_err("unable to delete non-existent %s\n", ifname);
137                         res = -ENODEV;
138                 }
139                 rtnl_unlock();
140         } else
141                 goto err_no_cmd;
142
143         /* Always return either count or an error.  If you return 0, you'll
144          * get called forever, which is bad.
145          */
146         return res;
147
148 err_no_cmd:
149         pr_err("no command found in bonding_masters. Use +ifname or -ifname.\n");
150         return -EPERM;
151 }
152
153 /* class attribute for bond_masters file.  This ends up in /sys/class/net */
154 static CLASS_ATTR(bonding_masters,  S_IWUSR | S_IRUGO,
155                   bonding_show_bonds, bonding_store_bonds);
156
157 int bond_create_slave_symlinks(struct net_device *master,
158                                struct net_device *slave)
159 {
160         char linkname[IFNAMSIZ+7];
161         int ret = 0;
162
163         /* first, create a link from the slave back to the master */
164         ret = sysfs_create_link(&(slave->dev.kobj), &(master->dev.kobj),
165                                 "master");
166         if (ret)
167                 return ret;
168         /* next, create a link from the master to the slave */
169         sprintf(linkname, "slave_%s", slave->name);
170         ret = sysfs_create_link(&(master->dev.kobj), &(slave->dev.kobj),
171                                 linkname);
172         return ret;
173
174 }
175
176 void bond_destroy_slave_symlinks(struct net_device *master,
177                                  struct net_device *slave)
178 {
179         char linkname[IFNAMSIZ+7];
180
181         sysfs_remove_link(&(slave->dev.kobj), "master");
182         sprintf(linkname, "slave_%s", slave->name);
183         sysfs_remove_link(&(master->dev.kobj), linkname);
184 }
185
186
187 /*
188  * Show the slaves in the current bond.
189  */
190 static ssize_t bonding_show_slaves(struct device *d,
191                                    struct device_attribute *attr, char *buf)
192 {
193         struct slave *slave;
194         int i, res = 0;
195         struct bonding *bond = to_bond(d);
196
197         read_lock(&bond->lock);
198         bond_for_each_slave(bond, slave, i) {
199                 if (res > (PAGE_SIZE - IFNAMSIZ)) {
200                         /* not enough space for another interface name */
201                         if ((PAGE_SIZE - res) > 10)
202                                 res = PAGE_SIZE - 10;
203                         res += sprintf(buf + res, "++more++ ");
204                         break;
205                 }
206                 res += sprintf(buf + res, "%s ", slave->dev->name);
207         }
208         read_unlock(&bond->lock);
209         if (res)
210                 buf[res-1] = '\n'; /* eat the leftover space */
211         return res;
212 }
213
214 /*
215  * Set the slaves in the current bond.  The bond interface must be
216  * up for this to succeed.
217  * This is supposed to be only thin wrapper for bond_enslave and bond_release.
218  * All hard work should be done there.
219  */
220 static ssize_t bonding_store_slaves(struct device *d,
221                                     struct device_attribute *attr,
222                                     const char *buffer, size_t count)
223 {
224         char command[IFNAMSIZ + 1] = { 0, };
225         char *ifname;
226         int res, ret = count;
227         struct net_device *dev;
228         struct bonding *bond = to_bond(d);
229
230         if (!rtnl_trylock())
231                 return restart_syscall();
232
233         sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
234         ifname = command + 1;
235         if ((strlen(command) <= 1) ||
236             !dev_valid_name(ifname))
237                 goto err_no_cmd;
238
239         dev = __dev_get_by_name(dev_net(bond->dev), ifname);
240         if (!dev) {
241                 pr_info("%s: Interface %s does not exist!\n",
242                         bond->dev->name, ifname);
243                 ret = -ENODEV;
244                 goto out;
245         }
246
247         switch (command[0]) {
248         case '+':
249                 pr_info("%s: Adding slave %s.\n", bond->dev->name, dev->name);
250                 res = bond_enslave(bond->dev, dev);
251                 break;
252
253         case '-':
254                 pr_info("%s: Removing slave %s.\n", bond->dev->name, dev->name);
255                 res = bond_release(bond->dev, dev);
256                 break;
257
258         default:
259                 goto err_no_cmd;
260         }
261
262         if (res)
263                 ret = res;
264         goto out;
265
266 err_no_cmd:
267         pr_err("no command found in slaves file for bond %s. Use +ifname or -ifname.\n",
268                bond->dev->name);
269         ret = -EPERM;
270
271 out:
272         rtnl_unlock();
273         return ret;
274 }
275
276 static DEVICE_ATTR(slaves, S_IRUGO | S_IWUSR, bonding_show_slaves,
277                    bonding_store_slaves);
278
279 /*
280  * Show and set the bonding mode.  The bond interface must be down to
281  * change the mode.
282  */
283 static ssize_t bonding_show_mode(struct device *d,
284                                  struct device_attribute *attr, char *buf)
285 {
286         struct bonding *bond = to_bond(d);
287
288         return sprintf(buf, "%s %d\n",
289                         bond_mode_tbl[bond->params.mode].modename,
290                         bond->params.mode);
291 }
292
293 static ssize_t bonding_store_mode(struct device *d,
294                                   struct device_attribute *attr,
295                                   const char *buf, size_t count)
296 {
297         int new_value, ret = count;
298         struct bonding *bond = to_bond(d);
299
300         if (bond->dev->flags & IFF_UP) {
301                 pr_err("unable to update mode of %s because interface is up.\n",
302                        bond->dev->name);
303                 ret = -EPERM;
304                 goto out;
305         }
306
307         new_value = bond_parse_parm(buf, bond_mode_tbl);
308         if (new_value < 0)  {
309                 pr_err("%s: Ignoring invalid mode value %.*s.\n",
310                        bond->dev->name, (int)strlen(buf) - 1, buf);
311                 ret = -EINVAL;
312                 goto out;
313         }
314         if ((new_value == BOND_MODE_ALB ||
315              new_value == BOND_MODE_TLB) &&
316             bond->params.arp_interval) {
317                 pr_err("%s: %s mode is incompatible with arp monitoring.\n",
318                        bond->dev->name, bond_mode_tbl[new_value].modename);
319                 ret = -EINVAL;
320                 goto out;
321         }
322
323         bond->params.mode = new_value;
324         bond_set_mode_ops(bond, bond->params.mode);
325         pr_info("%s: setting mode to %s (%d).\n",
326                 bond->dev->name, bond_mode_tbl[new_value].modename,
327                 new_value);
328 out:
329         return ret;
330 }
331 static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
332                    bonding_show_mode, bonding_store_mode);
333
334 /*
335  * Show and set the bonding transmit hash method.
336  * The bond interface must be down to change the xmit hash policy.
337  */
338 static ssize_t bonding_show_xmit_hash(struct device *d,
339                                       struct device_attribute *attr,
340                                       char *buf)
341 {
342         struct bonding *bond = to_bond(d);
343
344         return sprintf(buf, "%s %d\n",
345                        xmit_hashtype_tbl[bond->params.xmit_policy].modename,
346                        bond->params.xmit_policy);
347 }
348
349 static ssize_t bonding_store_xmit_hash(struct device *d,
350                                        struct device_attribute *attr,
351                                        const char *buf, size_t count)
352 {
353         int new_value, ret = count;
354         struct bonding *bond = to_bond(d);
355
356         if (bond->dev->flags & IFF_UP) {
357                 pr_err("%s: Interface is up. Unable to update xmit policy.\n",
358                        bond->dev->name);
359                 ret = -EPERM;
360                 goto out;
361         }
362
363         new_value = bond_parse_parm(buf, xmit_hashtype_tbl);
364         if (new_value < 0)  {
365                 pr_err("%s: Ignoring invalid xmit hash policy value %.*s.\n",
366                        bond->dev->name,
367                        (int)strlen(buf) - 1, buf);
368                 ret = -EINVAL;
369                 goto out;
370         } else {
371                 bond->params.xmit_policy = new_value;
372                 bond_set_mode_ops(bond, bond->params.mode);
373                 pr_info("%s: setting xmit hash policy to %s (%d).\n",
374                         bond->dev->name,
375                         xmit_hashtype_tbl[new_value].modename, new_value);
376         }
377 out:
378         return ret;
379 }
380 static DEVICE_ATTR(xmit_hash_policy, S_IRUGO | S_IWUSR,
381                    bonding_show_xmit_hash, bonding_store_xmit_hash);
382
383 /*
384  * Show and set arp_validate.
385  */
386 static ssize_t bonding_show_arp_validate(struct device *d,
387                                          struct device_attribute *attr,
388                                          char *buf)
389 {
390         struct bonding *bond = to_bond(d);
391
392         return sprintf(buf, "%s %d\n",
393                        arp_validate_tbl[bond->params.arp_validate].modename,
394                        bond->params.arp_validate);
395 }
396
397 static ssize_t bonding_store_arp_validate(struct device *d,
398                                           struct device_attribute *attr,
399                                           const char *buf, size_t count)
400 {
401         int new_value;
402         struct bonding *bond = to_bond(d);
403
404         new_value = bond_parse_parm(buf, arp_validate_tbl);
405         if (new_value < 0) {
406                 pr_err("%s: Ignoring invalid arp_validate value %s\n",
407                        bond->dev->name, buf);
408                 return -EINVAL;
409         }
410         if (new_value && (bond->params.mode != BOND_MODE_ACTIVEBACKUP)) {
411                 pr_err("%s: arp_validate only supported in active-backup mode.\n",
412                        bond->dev->name);
413                 return -EINVAL;
414         }
415         pr_info("%s: setting arp_validate to %s (%d).\n",
416                 bond->dev->name, arp_validate_tbl[new_value].modename,
417                 new_value);
418
419         bond->params.arp_validate = new_value;
420
421         return count;
422 }
423
424 static DEVICE_ATTR(arp_validate, S_IRUGO | S_IWUSR, bonding_show_arp_validate,
425                    bonding_store_arp_validate);
426
427 /*
428  * Show and store fail_over_mac.  User only allowed to change the
429  * value when there are no slaves.
430  */
431 static ssize_t bonding_show_fail_over_mac(struct device *d,
432                                           struct device_attribute *attr,
433                                           char *buf)
434 {
435         struct bonding *bond = to_bond(d);
436
437         return sprintf(buf, "%s %d\n",
438                        fail_over_mac_tbl[bond->params.fail_over_mac].modename,
439                        bond->params.fail_over_mac);
440 }
441
442 static ssize_t bonding_store_fail_over_mac(struct device *d,
443                                            struct device_attribute *attr,
444                                            const char *buf, size_t count)
445 {
446         int new_value;
447         struct bonding *bond = to_bond(d);
448
449         if (bond->slave_cnt != 0) {
450                 pr_err("%s: Can't alter fail_over_mac with slaves in bond.\n",
451                        bond->dev->name);
452                 return -EPERM;
453         }
454
455         new_value = bond_parse_parm(buf, fail_over_mac_tbl);
456         if (new_value < 0) {
457                 pr_err("%s: Ignoring invalid fail_over_mac value %s.\n",
458                        bond->dev->name, buf);
459                 return -EINVAL;
460         }
461
462         bond->params.fail_over_mac = new_value;
463         pr_info("%s: Setting fail_over_mac to %s (%d).\n",
464                 bond->dev->name, fail_over_mac_tbl[new_value].modename,
465                 new_value);
466
467         return count;
468 }
469
470 static DEVICE_ATTR(fail_over_mac, S_IRUGO | S_IWUSR,
471                    bonding_show_fail_over_mac, bonding_store_fail_over_mac);
472
473 /*
474  * Show and set the arp timer interval.  There are two tricky bits
475  * here.  First, if ARP monitoring is activated, then we must disable
476  * MII monitoring.  Second, if the ARP timer isn't running, we must
477  * start it.
478  */
479 static ssize_t bonding_show_arp_interval(struct device *d,
480                                          struct device_attribute *attr,
481                                          char *buf)
482 {
483         struct bonding *bond = to_bond(d);
484
485         return sprintf(buf, "%d\n", bond->params.arp_interval);
486 }
487
488 static ssize_t bonding_store_arp_interval(struct device *d,
489                                           struct device_attribute *attr,
490                                           const char *buf, size_t count)
491 {
492         int new_value, ret = count;
493         struct bonding *bond = to_bond(d);
494
495         if (sscanf(buf, "%d", &new_value) != 1) {
496                 pr_err("%s: no arp_interval value specified.\n",
497                        bond->dev->name);
498                 ret = -EINVAL;
499                 goto out;
500         }
501         if (new_value < 0) {
502                 pr_err("%s: Invalid arp_interval value %d not in range 1-%d; rejected.\n",
503                        bond->dev->name, new_value, INT_MAX);
504                 ret = -EINVAL;
505                 goto out;
506         }
507         if (bond->params.mode == BOND_MODE_ALB ||
508             bond->params.mode == BOND_MODE_TLB) {
509                 pr_info("%s: ARP monitoring cannot be used with ALB/TLB. Only MII monitoring is supported on %s.\n",
510                         bond->dev->name, bond->dev->name);
511                 ret = -EINVAL;
512                 goto out;
513         }
514         pr_info("%s: Setting ARP monitoring interval to %d.\n",
515                 bond->dev->name, new_value);
516         bond->params.arp_interval = new_value;
517         if (bond->params.miimon) {
518                 pr_info("%s: ARP monitoring cannot be used with MII monitoring. %s Disabling MII monitoring.\n",
519                         bond->dev->name, bond->dev->name);
520                 bond->params.miimon = 0;
521                 if (delayed_work_pending(&bond->mii_work)) {
522                         cancel_delayed_work(&bond->mii_work);
523                         flush_workqueue(bond->wq);
524                 }
525         }
526         if (!bond->params.arp_targets[0]) {
527                 pr_info("%s: ARP monitoring has been set up, but no ARP targets have been specified.\n",
528                         bond->dev->name);
529         }
530         if (bond->dev->flags & IFF_UP) {
531                 /* If the interface is up, we may need to fire off
532                  * the ARP timer.  If the interface is down, the
533                  * timer will get fired off when the open function
534                  * is called.
535                  */
536                 if (!delayed_work_pending(&bond->arp_work)) {
537                         if (bond->params.mode == BOND_MODE_ACTIVEBACKUP)
538                                 INIT_DELAYED_WORK(&bond->arp_work,
539                                                   bond_activebackup_arp_mon);
540                         else
541                                 INIT_DELAYED_WORK(&bond->arp_work,
542                                                   bond_loadbalance_arp_mon);
543
544                         queue_delayed_work(bond->wq, &bond->arp_work, 0);
545                 }
546         }
547
548 out:
549         return ret;
550 }
551 static DEVICE_ATTR(arp_interval, S_IRUGO | S_IWUSR,
552                    bonding_show_arp_interval, bonding_store_arp_interval);
553
554 /*
555  * Show and set the arp targets.
556  */
557 static ssize_t bonding_show_arp_targets(struct device *d,
558                                         struct device_attribute *attr,
559                                         char *buf)
560 {
561         int i, res = 0;
562         struct bonding *bond = to_bond(d);
563
564         for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) {
565                 if (bond->params.arp_targets[i])
566                         res += sprintf(buf + res, "%pI4 ",
567                                        &bond->params.arp_targets[i]);
568         }
569         if (res)
570                 buf[res-1] = '\n'; /* eat the leftover space */
571         return res;
572 }
573
574 static ssize_t bonding_store_arp_targets(struct device *d,
575                                          struct device_attribute *attr,
576                                          const char *buf, size_t count)
577 {
578         __be32 newtarget;
579         int i = 0, done = 0, ret = count;
580         struct bonding *bond = to_bond(d);
581         __be32 *targets;
582
583         targets = bond->params.arp_targets;
584         newtarget = in_aton(buf + 1);
585         /* look for adds */
586         if (buf[0] == '+') {
587                 if ((newtarget == 0) || (newtarget == htonl(INADDR_BROADCAST))) {
588                         pr_err("%s: invalid ARP target %pI4 specified for addition\n",
589                                bond->dev->name, &newtarget);
590                         ret = -EINVAL;
591                         goto out;
592                 }
593                 /* look for an empty slot to put the target in, and check for dupes */
594                 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && !done; i++) {
595                         if (targets[i] == newtarget) { /* duplicate */
596                                 pr_err("%s: ARP target %pI4 is already present\n",
597                                        bond->dev->name, &newtarget);
598                                 ret = -EINVAL;
599                                 goto out;
600                         }
601                         if (targets[i] == 0) {
602                                 pr_info("%s: adding ARP target %pI4.\n",
603                                         bond->dev->name, &newtarget);
604                                 done = 1;
605                                 targets[i] = newtarget;
606                         }
607                 }
608                 if (!done) {
609                         pr_err("%s: ARP target table is full!\n",
610                                bond->dev->name);
611                         ret = -EINVAL;
612                         goto out;
613                 }
614
615         } else if (buf[0] == '-')       {
616                 if ((newtarget == 0) || (newtarget == htonl(INADDR_BROADCAST))) {
617                         pr_err("%s: invalid ARP target %pI4 specified for removal\n",
618                                bond->dev->name, &newtarget);
619                         ret = -EINVAL;
620                         goto out;
621                 }
622
623                 for (i = 0; (i < BOND_MAX_ARP_TARGETS) && !done; i++) {
624                         if (targets[i] == newtarget) {
625                                 int j;
626                                 pr_info("%s: removing ARP target %pI4.\n",
627                                         bond->dev->name, &newtarget);
628                                 for (j = i; (j < (BOND_MAX_ARP_TARGETS-1)) && targets[j+1]; j++)
629                                         targets[j] = targets[j+1];
630
631                                 targets[j] = 0;
632                                 done = 1;
633                         }
634                 }
635                 if (!done) {
636                         pr_info("%s: unable to remove nonexistent ARP target %pI4.\n",
637                                 bond->dev->name, &newtarget);
638                         ret = -EINVAL;
639                         goto out;
640                 }
641         } else {
642                 pr_err("no command found in arp_ip_targets file for bond %s. Use +<addr> or -<addr>.\n",
643                        bond->dev->name);
644                 ret = -EPERM;
645                 goto out;
646         }
647
648 out:
649         return ret;
650 }
651 static DEVICE_ATTR(arp_ip_target, S_IRUGO | S_IWUSR , bonding_show_arp_targets, bonding_store_arp_targets);
652
653 /*
654  * Show and set the up and down delays.  These must be multiples of the
655  * MII monitoring value, and are stored internally as the multiplier.
656  * Thus, we must translate to MS for the real world.
657  */
658 static ssize_t bonding_show_downdelay(struct device *d,
659                                       struct device_attribute *attr,
660                                       char *buf)
661 {
662         struct bonding *bond = to_bond(d);
663
664         return sprintf(buf, "%d\n", bond->params.downdelay * bond->params.miimon);
665 }
666
667 static ssize_t bonding_store_downdelay(struct device *d,
668                                        struct device_attribute *attr,
669                                        const char *buf, size_t count)
670 {
671         int new_value, ret = count;
672         struct bonding *bond = to_bond(d);
673
674         if (!(bond->params.miimon)) {
675                 pr_err("%s: Unable to set down delay as MII monitoring is disabled\n",
676                        bond->dev->name);
677                 ret = -EPERM;
678                 goto out;
679         }
680
681         if (sscanf(buf, "%d", &new_value) != 1) {
682                 pr_err("%s: no down delay value specified.\n", bond->dev->name);
683                 ret = -EINVAL;
684                 goto out;
685         }
686         if (new_value < 0) {
687                 pr_err("%s: Invalid down delay value %d not in range %d-%d; rejected.\n",
688                        bond->dev->name, new_value, 1, INT_MAX);
689                 ret = -EINVAL;
690                 goto out;
691         } else {
692                 if ((new_value % bond->params.miimon) != 0) {
693                         pr_warning("%s: Warning: down delay (%d) is not a multiple of miimon (%d), delay rounded to %d ms\n",
694                                    bond->dev->name, new_value,
695                                    bond->params.miimon,
696                                    (new_value / bond->params.miimon) *
697                                    bond->params.miimon);
698                 }
699                 bond->params.downdelay = new_value / bond->params.miimon;
700                 pr_info("%s: Setting down delay to %d.\n",
701                         bond->dev->name,
702                         bond->params.downdelay * bond->params.miimon);
703
704         }
705
706 out:
707         return ret;
708 }
709 static DEVICE_ATTR(downdelay, S_IRUGO | S_IWUSR,
710                    bonding_show_downdelay, bonding_store_downdelay);
711
712 static ssize_t bonding_show_updelay(struct device *d,
713                                     struct device_attribute *attr,
714                                     char *buf)
715 {
716         struct bonding *bond = to_bond(d);
717
718         return sprintf(buf, "%d\n", bond->params.updelay * bond->params.miimon);
719
720 }
721
722 static ssize_t bonding_store_updelay(struct device *d,
723                                      struct device_attribute *attr,
724                                      const char *buf, size_t count)
725 {
726         int new_value, ret = count;
727         struct bonding *bond = to_bond(d);
728
729         if (!(bond->params.miimon)) {
730                 pr_err("%s: Unable to set up delay as MII monitoring is disabled\n",
731                        bond->dev->name);
732                 ret = -EPERM;
733                 goto out;
734         }
735
736         if (sscanf(buf, "%d", &new_value) != 1) {
737                 pr_err("%s: no up delay value specified.\n",
738                        bond->dev->name);
739                 ret = -EINVAL;
740                 goto out;
741         }
742         if (new_value < 0) {
743                 pr_err("%s: Invalid down delay value %d not in range %d-%d; rejected.\n",
744                        bond->dev->name, new_value, 1, INT_MAX);
745                 ret = -EINVAL;
746                 goto out;
747         } else {
748                 if ((new_value % bond->params.miimon) != 0) {
749                         pr_warning("%s: Warning: up delay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
750                                    bond->dev->name, new_value,
751                                    bond->params.miimon,
752                                    (new_value / bond->params.miimon) *
753                                    bond->params.miimon);
754                 }
755                 bond->params.updelay = new_value / bond->params.miimon;
756                 pr_info("%s: Setting up delay to %d.\n",
757                         bond->dev->name,
758                         bond->params.updelay * bond->params.miimon);
759         }
760
761 out:
762         return ret;
763 }
764 static DEVICE_ATTR(updelay, S_IRUGO | S_IWUSR,
765                    bonding_show_updelay, bonding_store_updelay);
766
767 /*
768  * Show and set the LACP interval.  Interface must be down, and the mode
769  * must be set to 802.3ad mode.
770  */
771 static ssize_t bonding_show_lacp(struct device *d,
772                                  struct device_attribute *attr,
773                                  char *buf)
774 {
775         struct bonding *bond = to_bond(d);
776
777         return sprintf(buf, "%s %d\n",
778                 bond_lacp_tbl[bond->params.lacp_fast].modename,
779                 bond->params.lacp_fast);
780 }
781
782 static ssize_t bonding_store_lacp(struct device *d,
783                                   struct device_attribute *attr,
784                                   const char *buf, size_t count)
785 {
786         int new_value, ret = count;
787         struct bonding *bond = to_bond(d);
788
789         if (bond->dev->flags & IFF_UP) {
790                 pr_err("%s: Unable to update LACP rate because interface is up.\n",
791                        bond->dev->name);
792                 ret = -EPERM;
793                 goto out;
794         }
795
796         if (bond->params.mode != BOND_MODE_8023AD) {
797                 pr_err("%s: Unable to update LACP rate because bond is not in 802.3ad mode.\n",
798                        bond->dev->name);
799                 ret = -EPERM;
800                 goto out;
801         }
802
803         new_value = bond_parse_parm(buf, bond_lacp_tbl);
804
805         if ((new_value == 1) || (new_value == 0)) {
806                 bond->params.lacp_fast = new_value;
807                 pr_info("%s: Setting LACP rate to %s (%d).\n",
808                         bond->dev->name, bond_lacp_tbl[new_value].modename,
809                         new_value);
810         } else {
811                 pr_err("%s: Ignoring invalid LACP rate value %.*s.\n",
812                        bond->dev->name, (int)strlen(buf) - 1, buf);
813                 ret = -EINVAL;
814         }
815 out:
816         return ret;
817 }
818 static DEVICE_ATTR(lacp_rate, S_IRUGO | S_IWUSR,
819                    bonding_show_lacp, bonding_store_lacp);
820
821 static ssize_t bonding_show_ad_select(struct device *d,
822                                       struct device_attribute *attr,
823                                       char *buf)
824 {
825         struct bonding *bond = to_bond(d);
826
827         return sprintf(buf, "%s %d\n",
828                 ad_select_tbl[bond->params.ad_select].modename,
829                 bond->params.ad_select);
830 }
831
832
833 static ssize_t bonding_store_ad_select(struct device *d,
834                                        struct device_attribute *attr,
835                                        const char *buf, size_t count)
836 {
837         int new_value, ret = count;
838         struct bonding *bond = to_bond(d);
839
840         if (bond->dev->flags & IFF_UP) {
841                 pr_err("%s: Unable to update ad_select because interface is up.\n",
842                        bond->dev->name);
843                 ret = -EPERM;
844                 goto out;
845         }
846
847         new_value = bond_parse_parm(buf, ad_select_tbl);
848
849         if (new_value != -1) {
850                 bond->params.ad_select = new_value;
851                 pr_info("%s: Setting ad_select to %s (%d).\n",
852                         bond->dev->name, ad_select_tbl[new_value].modename,
853                         new_value);
854         } else {
855                 pr_err("%s: Ignoring invalid ad_select value %.*s.\n",
856                        bond->dev->name, (int)strlen(buf) - 1, buf);
857                 ret = -EINVAL;
858         }
859 out:
860         return ret;
861 }
862 static DEVICE_ATTR(ad_select, S_IRUGO | S_IWUSR,
863                    bonding_show_ad_select, bonding_store_ad_select);
864
865 /*
866  * Show and set the number of peer notifications to send after a failover event.
867  */
868 static ssize_t bonding_show_num_peer_notif(struct device *d,
869                                            struct device_attribute *attr,
870                                            char *buf)
871 {
872         struct bonding *bond = to_bond(d);
873         return sprintf(buf, "%d\n", bond->params.num_peer_notif);
874 }
875
876 static ssize_t bonding_store_num_peer_notif(struct device *d,
877                                             struct device_attribute *attr,
878                                             const char *buf, size_t count)
879 {
880         struct bonding *bond = to_bond(d);
881         int err = kstrtou8(buf, 10, &bond->params.num_peer_notif);
882         return err ? err : count;
883 }
884 static DEVICE_ATTR(num_grat_arp, S_IRUGO | S_IWUSR,
885                    bonding_show_num_peer_notif, bonding_store_num_peer_notif);
886 static DEVICE_ATTR(num_unsol_na, S_IRUGO | S_IWUSR,
887                    bonding_show_num_peer_notif, bonding_store_num_peer_notif);
888
889 /*
890  * Show and set the MII monitor interval.  There are two tricky bits
891  * here.  First, if MII monitoring is activated, then we must disable
892  * ARP monitoring.  Second, if the timer isn't running, we must
893  * start it.
894  */
895 static ssize_t bonding_show_miimon(struct device *d,
896                                    struct device_attribute *attr,
897                                    char *buf)
898 {
899         struct bonding *bond = to_bond(d);
900
901         return sprintf(buf, "%d\n", bond->params.miimon);
902 }
903
904 static ssize_t bonding_store_miimon(struct device *d,
905                                     struct device_attribute *attr,
906                                     const char *buf, size_t count)
907 {
908         int new_value, ret = count;
909         struct bonding *bond = to_bond(d);
910
911         if (sscanf(buf, "%d", &new_value) != 1) {
912                 pr_err("%s: no miimon value specified.\n",
913                        bond->dev->name);
914                 ret = -EINVAL;
915                 goto out;
916         }
917         if (new_value < 0) {
918                 pr_err("%s: Invalid miimon value %d not in range %d-%d; rejected.\n",
919                        bond->dev->name, new_value, 1, INT_MAX);
920                 ret = -EINVAL;
921                 goto out;
922         } else {
923                 pr_info("%s: Setting MII monitoring interval to %d.\n",
924                         bond->dev->name, new_value);
925                 bond->params.miimon = new_value;
926                 if (bond->params.updelay)
927                         pr_info("%s: Note: Updating updelay (to %d) since it is a multiple of the miimon value.\n",
928                                 bond->dev->name,
929                                 bond->params.updelay * bond->params.miimon);
930                 if (bond->params.downdelay)
931                         pr_info("%s: Note: Updating downdelay (to %d) since it is a multiple of the miimon value.\n",
932                                 bond->dev->name,
933                                 bond->params.downdelay * bond->params.miimon);
934                 if (bond->params.arp_interval) {
935                         pr_info("%s: MII monitoring cannot be used with ARP monitoring. Disabling ARP monitoring...\n",
936                                 bond->dev->name);
937                         bond->params.arp_interval = 0;
938                         if (bond->params.arp_validate) {
939                                 bond->params.arp_validate =
940                                         BOND_ARP_VALIDATE_NONE;
941                         }
942                         if (delayed_work_pending(&bond->arp_work)) {
943                                 cancel_delayed_work(&bond->arp_work);
944                                 flush_workqueue(bond->wq);
945                         }
946                 }
947
948                 if (bond->dev->flags & IFF_UP) {
949                         /* If the interface is up, we may need to fire off
950                          * the MII timer. If the interface is down, the
951                          * timer will get fired off when the open function
952                          * is called.
953                          */
954                         if (!delayed_work_pending(&bond->mii_work)) {
955                                 INIT_DELAYED_WORK(&bond->mii_work,
956                                                   bond_mii_monitor);
957                                 queue_delayed_work(bond->wq,
958                                                    &bond->mii_work, 0);
959                         }
960                 }
961         }
962 out:
963         return ret;
964 }
965 static DEVICE_ATTR(miimon, S_IRUGO | S_IWUSR,
966                    bonding_show_miimon, bonding_store_miimon);
967
968 /*
969  * Show and set the primary slave.  The store function is much
970  * simpler than bonding_store_slaves function because it only needs to
971  * handle one interface name.
972  * The bond must be a mode that supports a primary for this be
973  * set.
974  */
975 static ssize_t bonding_show_primary(struct device *d,
976                                     struct device_attribute *attr,
977                                     char *buf)
978 {
979         int count = 0;
980         struct bonding *bond = to_bond(d);
981
982         if (bond->primary_slave)
983                 count = sprintf(buf, "%s\n", bond->primary_slave->dev->name);
984
985         return count;
986 }
987
988 static ssize_t bonding_store_primary(struct device *d,
989                                      struct device_attribute *attr,
990                                      const char *buf, size_t count)
991 {
992         int i;
993         struct slave *slave;
994         struct bonding *bond = to_bond(d);
995
996         if (!rtnl_trylock())
997                 return restart_syscall();
998         block_netpoll_tx();
999         read_lock(&bond->lock);
1000         write_lock_bh(&bond->curr_slave_lock);
1001
1002         if (!USES_PRIMARY(bond->params.mode)) {
1003                 pr_info("%s: Unable to set primary slave; %s is in mode %d\n",
1004                         bond->dev->name, bond->dev->name, bond->params.mode);
1005         } else {
1006                 bond_for_each_slave(bond, slave, i) {
1007                         if (strnicmp
1008                             (slave->dev->name, buf,
1009                              strlen(slave->dev->name)) == 0) {
1010                                 pr_info("%s: Setting %s as primary slave.\n",
1011                                         bond->dev->name, slave->dev->name);
1012                                 bond->primary_slave = slave;
1013                                 strcpy(bond->params.primary, slave->dev->name);
1014                                 bond_select_active_slave(bond);
1015                                 goto out;
1016                         }
1017                 }
1018
1019                 /* if we got here, then we didn't match the name of any slave */
1020
1021                 if (strlen(buf) == 0 || buf[0] == '\n') {
1022                         pr_info("%s: Setting primary slave to None.\n",
1023                                 bond->dev->name);
1024                         bond->primary_slave = NULL;
1025                                 bond_select_active_slave(bond);
1026                 } else {
1027                         pr_info("%s: Unable to set %.*s as primary slave as it is not a slave.\n",
1028                                 bond->dev->name, (int)strlen(buf) - 1, buf);
1029                 }
1030         }
1031 out:
1032         write_unlock_bh(&bond->curr_slave_lock);
1033         read_unlock(&bond->lock);
1034         unblock_netpoll_tx();
1035         rtnl_unlock();
1036
1037         return count;
1038 }
1039 static DEVICE_ATTR(primary, S_IRUGO | S_IWUSR,
1040                    bonding_show_primary, bonding_store_primary);
1041
1042 /*
1043  * Show and set the primary_reselect flag.
1044  */
1045 static ssize_t bonding_show_primary_reselect(struct device *d,
1046                                              struct device_attribute *attr,
1047                                              char *buf)
1048 {
1049         struct bonding *bond = to_bond(d);
1050
1051         return sprintf(buf, "%s %d\n",
1052                        pri_reselect_tbl[bond->params.primary_reselect].modename,
1053                        bond->params.primary_reselect);
1054 }
1055
1056 static ssize_t bonding_store_primary_reselect(struct device *d,
1057                                               struct device_attribute *attr,
1058                                               const char *buf, size_t count)
1059 {
1060         int new_value, ret = count;
1061         struct bonding *bond = to_bond(d);
1062
1063         if (!rtnl_trylock())
1064                 return restart_syscall();
1065
1066         new_value = bond_parse_parm(buf, pri_reselect_tbl);
1067         if (new_value < 0)  {
1068                 pr_err("%s: Ignoring invalid primary_reselect value %.*s.\n",
1069                        bond->dev->name,
1070                        (int) strlen(buf) - 1, buf);
1071                 ret = -EINVAL;
1072                 goto out;
1073         }
1074
1075         bond->params.primary_reselect = new_value;
1076         pr_info("%s: setting primary_reselect to %s (%d).\n",
1077                 bond->dev->name, pri_reselect_tbl[new_value].modename,
1078                 new_value);
1079
1080         block_netpoll_tx();
1081         read_lock(&bond->lock);
1082         write_lock_bh(&bond->curr_slave_lock);
1083         bond_select_active_slave(bond);
1084         write_unlock_bh(&bond->curr_slave_lock);
1085         read_unlock(&bond->lock);
1086         unblock_netpoll_tx();
1087 out:
1088         rtnl_unlock();
1089         return ret;
1090 }
1091 static DEVICE_ATTR(primary_reselect, S_IRUGO | S_IWUSR,
1092                    bonding_show_primary_reselect,
1093                    bonding_store_primary_reselect);
1094
1095 /*
1096  * Show and set the use_carrier flag.
1097  */
1098 static ssize_t bonding_show_carrier(struct device *d,
1099                                     struct device_attribute *attr,
1100                                     char *buf)
1101 {
1102         struct bonding *bond = to_bond(d);
1103
1104         return sprintf(buf, "%d\n", bond->params.use_carrier);
1105 }
1106
1107 static ssize_t bonding_store_carrier(struct device *d,
1108                                      struct device_attribute *attr,
1109                                      const char *buf, size_t count)
1110 {
1111         int new_value, ret = count;
1112         struct bonding *bond = to_bond(d);
1113
1114
1115         if (sscanf(buf, "%d", &new_value) != 1) {
1116                 pr_err("%s: no use_carrier value specified.\n",
1117                        bond->dev->name);
1118                 ret = -EINVAL;
1119                 goto out;
1120         }
1121         if ((new_value == 0) || (new_value == 1)) {
1122                 bond->params.use_carrier = new_value;
1123                 pr_info("%s: Setting use_carrier to %d.\n",
1124                         bond->dev->name, new_value);
1125         } else {
1126                 pr_info("%s: Ignoring invalid use_carrier value %d.\n",
1127                         bond->dev->name, new_value);
1128         }
1129 out:
1130         return ret;
1131 }
1132 static DEVICE_ATTR(use_carrier, S_IRUGO | S_IWUSR,
1133                    bonding_show_carrier, bonding_store_carrier);
1134
1135
1136 /*
1137  * Show and set currently active_slave.
1138  */
1139 static ssize_t bonding_show_active_slave(struct device *d,
1140                                          struct device_attribute *attr,
1141                                          char *buf)
1142 {
1143         struct slave *curr;
1144         struct bonding *bond = to_bond(d);
1145         int count = 0;
1146
1147         read_lock(&bond->curr_slave_lock);
1148         curr = bond->curr_active_slave;
1149         read_unlock(&bond->curr_slave_lock);
1150
1151         if (USES_PRIMARY(bond->params.mode) && curr)
1152                 count = sprintf(buf, "%s\n", curr->dev->name);
1153         return count;
1154 }
1155
1156 static ssize_t bonding_store_active_slave(struct device *d,
1157                                           struct device_attribute *attr,
1158                                           const char *buf, size_t count)
1159 {
1160         int i;
1161         struct slave *slave;
1162         struct slave *old_active = NULL;
1163         struct slave *new_active = NULL;
1164         struct bonding *bond = to_bond(d);
1165
1166         if (!rtnl_trylock())
1167                 return restart_syscall();
1168
1169         block_netpoll_tx();
1170         read_lock(&bond->lock);
1171         write_lock_bh(&bond->curr_slave_lock);
1172
1173         if (!USES_PRIMARY(bond->params.mode))
1174                 pr_info("%s: Unable to change active slave; %s is in mode %d\n",
1175                         bond->dev->name, bond->dev->name, bond->params.mode);
1176         else {
1177                 bond_for_each_slave(bond, slave, i) {
1178                         if (strnicmp
1179                             (slave->dev->name, buf,
1180                              strlen(slave->dev->name)) == 0) {
1181                                 old_active = bond->curr_active_slave;
1182                                 new_active = slave;
1183                                 if (new_active == old_active) {
1184                                         /* do nothing */
1185                                         pr_info("%s: %s is already the current active slave.\n",
1186                                                 bond->dev->name,
1187                                                 slave->dev->name);
1188                                         goto out;
1189                                 }
1190                                 else {
1191                                         if ((new_active) &&
1192                                             (old_active) &&
1193                                             (new_active->link == BOND_LINK_UP) &&
1194                                             IS_UP(new_active->dev)) {
1195                                                 pr_info("%s: Setting %s as active slave.\n",
1196                                                         bond->dev->name,
1197                                                         slave->dev->name);
1198                                                         bond_change_active_slave(bond, new_active);
1199                                         }
1200                                         else {
1201                                                 pr_info("%s: Could not set %s as active slave; either %s is down or the link is down.\n",
1202                                                         bond->dev->name,
1203                                                         slave->dev->name,
1204                                                         slave->dev->name);
1205                                         }
1206                                         goto out;
1207                                 }
1208                         }
1209                 }
1210
1211                 /* if we got here, then we didn't match the name of any slave */
1212
1213                 if (strlen(buf) == 0 || buf[0] == '\n') {
1214                         pr_info("%s: Setting active slave to None.\n",
1215                                 bond->dev->name);
1216                         bond->primary_slave = NULL;
1217                         bond_select_active_slave(bond);
1218                 } else {
1219                         pr_info("%s: Unable to set %.*s as active slave as it is not a slave.\n",
1220                                 bond->dev->name, (int)strlen(buf) - 1, buf);
1221                 }
1222         }
1223  out:
1224         write_unlock_bh(&bond->curr_slave_lock);
1225         read_unlock(&bond->lock);
1226         unblock_netpoll_tx();
1227
1228         rtnl_unlock();
1229
1230         return count;
1231
1232 }
1233 static DEVICE_ATTR(active_slave, S_IRUGO | S_IWUSR,
1234                    bonding_show_active_slave, bonding_store_active_slave);
1235
1236
1237 /*
1238  * Show link status of the bond interface.
1239  */
1240 static ssize_t bonding_show_mii_status(struct device *d,
1241                                        struct device_attribute *attr,
1242                                        char *buf)
1243 {
1244         struct slave *curr;
1245         struct bonding *bond = to_bond(d);
1246
1247         read_lock(&bond->curr_slave_lock);
1248         curr = bond->curr_active_slave;
1249         read_unlock(&bond->curr_slave_lock);
1250
1251         return sprintf(buf, "%s\n", curr ? "up" : "down");
1252 }
1253 static DEVICE_ATTR(mii_status, S_IRUGO, bonding_show_mii_status, NULL);
1254
1255
1256 /*
1257  * Show current 802.3ad aggregator ID.
1258  */
1259 static ssize_t bonding_show_ad_aggregator(struct device *d,
1260                                           struct device_attribute *attr,
1261                                           char *buf)
1262 {
1263         int count = 0;
1264         struct bonding *bond = to_bond(d);
1265
1266         if (bond->params.mode == BOND_MODE_8023AD) {
1267                 struct ad_info ad_info;
1268                 count = sprintf(buf, "%d\n",
1269                                 (bond_3ad_get_active_agg_info(bond, &ad_info))
1270                                 ?  0 : ad_info.aggregator_id);
1271         }
1272
1273         return count;
1274 }
1275 static DEVICE_ATTR(ad_aggregator, S_IRUGO, bonding_show_ad_aggregator, NULL);
1276
1277
1278 /*
1279  * Show number of active 802.3ad ports.
1280  */
1281 static ssize_t bonding_show_ad_num_ports(struct device *d,
1282                                          struct device_attribute *attr,
1283                                          char *buf)
1284 {
1285         int count = 0;
1286         struct bonding *bond = to_bond(d);
1287
1288         if (bond->params.mode == BOND_MODE_8023AD) {
1289                 struct ad_info ad_info;
1290                 count = sprintf(buf, "%d\n",
1291                                 (bond_3ad_get_active_agg_info(bond, &ad_info))
1292                                 ?  0 : ad_info.ports);
1293         }
1294
1295         return count;
1296 }
1297 static DEVICE_ATTR(ad_num_ports, S_IRUGO, bonding_show_ad_num_ports, NULL);
1298
1299
1300 /*
1301  * Show current 802.3ad actor key.
1302  */
1303 static ssize_t bonding_show_ad_actor_key(struct device *d,
1304                                          struct device_attribute *attr,
1305                                          char *buf)
1306 {
1307         int count = 0;
1308         struct bonding *bond = to_bond(d);
1309
1310         if (bond->params.mode == BOND_MODE_8023AD) {
1311                 struct ad_info ad_info;
1312                 count = sprintf(buf, "%d\n",
1313                                 (bond_3ad_get_active_agg_info(bond, &ad_info))
1314                                 ?  0 : ad_info.actor_key);
1315         }
1316
1317         return count;
1318 }
1319 static DEVICE_ATTR(ad_actor_key, S_IRUGO, bonding_show_ad_actor_key, NULL);
1320
1321
1322 /*
1323  * Show current 802.3ad partner key.
1324  */
1325 static ssize_t bonding_show_ad_partner_key(struct device *d,
1326                                            struct device_attribute *attr,
1327                                            char *buf)
1328 {
1329         int count = 0;
1330         struct bonding *bond = to_bond(d);
1331
1332         if (bond->params.mode == BOND_MODE_8023AD) {
1333                 struct ad_info ad_info;
1334                 count = sprintf(buf, "%d\n",
1335                                 (bond_3ad_get_active_agg_info(bond, &ad_info))
1336                                 ?  0 : ad_info.partner_key);
1337         }
1338
1339         return count;
1340 }
1341 static DEVICE_ATTR(ad_partner_key, S_IRUGO, bonding_show_ad_partner_key, NULL);
1342
1343
1344 /*
1345  * Show current 802.3ad partner mac.
1346  */
1347 static ssize_t bonding_show_ad_partner_mac(struct device *d,
1348                                            struct device_attribute *attr,
1349                                            char *buf)
1350 {
1351         int count = 0;
1352         struct bonding *bond = to_bond(d);
1353
1354         if (bond->params.mode == BOND_MODE_8023AD) {
1355                 struct ad_info ad_info;
1356                 if (!bond_3ad_get_active_agg_info(bond, &ad_info))
1357                         count = sprintf(buf, "%pM\n", ad_info.partner_system);
1358         }
1359
1360         return count;
1361 }
1362 static DEVICE_ATTR(ad_partner_mac, S_IRUGO, bonding_show_ad_partner_mac, NULL);
1363
1364 /*
1365  * Show the queue_ids of the slaves in the current bond.
1366  */
1367 static ssize_t bonding_show_queue_id(struct device *d,
1368                                      struct device_attribute *attr,
1369                                      char *buf)
1370 {
1371         struct slave *slave;
1372         int i, res = 0;
1373         struct bonding *bond = to_bond(d);
1374
1375         if (!rtnl_trylock())
1376                 return restart_syscall();
1377
1378         read_lock(&bond->lock);
1379         bond_for_each_slave(bond, slave, i) {
1380                 if (res > (PAGE_SIZE - IFNAMSIZ - 6)) {
1381                         /* not enough space for another interface_name:queue_id pair */
1382                         if ((PAGE_SIZE - res) > 10)
1383                                 res = PAGE_SIZE - 10;
1384                         res += sprintf(buf + res, "++more++ ");
1385                         break;
1386                 }
1387                 res += sprintf(buf + res, "%s:%d ",
1388                                slave->dev->name, slave->queue_id);
1389         }
1390         read_unlock(&bond->lock);
1391         if (res)
1392                 buf[res-1] = '\n'; /* eat the leftover space */
1393         rtnl_unlock();
1394         return res;
1395 }
1396
1397 /*
1398  * Set the queue_ids of the  slaves in the current bond.  The bond
1399  * interface must be enslaved for this to work.
1400  */
1401 static ssize_t bonding_store_queue_id(struct device *d,
1402                                       struct device_attribute *attr,
1403                                       const char *buffer, size_t count)
1404 {
1405         struct slave *slave, *update_slave;
1406         struct bonding *bond = to_bond(d);
1407         u16 qid;
1408         int i, ret = count;
1409         char *delim;
1410         struct net_device *sdev = NULL;
1411
1412         if (!rtnl_trylock())
1413                 return restart_syscall();
1414
1415         /* delim will point to queue id if successful */
1416         delim = strchr(buffer, ':');
1417         if (!delim)
1418                 goto err_no_cmd;
1419
1420         /*
1421          * Terminate string that points to device name and bump it
1422          * up one, so we can read the queue id there.
1423          */
1424         *delim = '\0';
1425         if (sscanf(++delim, "%hd\n", &qid) != 1)
1426                 goto err_no_cmd;
1427
1428         /* Check buffer length, valid ifname and queue id */
1429         if (strlen(buffer) > IFNAMSIZ ||
1430             !dev_valid_name(buffer) ||
1431             qid > bond->params.tx_queues)
1432                 goto err_no_cmd;
1433
1434         /* Get the pointer to that interface if it exists */
1435         sdev = __dev_get_by_name(dev_net(bond->dev), buffer);
1436         if (!sdev)
1437                 goto err_no_cmd;
1438
1439         read_lock(&bond->lock);
1440
1441         /* Search for thes slave and check for duplicate qids */
1442         update_slave = NULL;
1443         bond_for_each_slave(bond, slave, i) {
1444                 if (sdev == slave->dev)
1445                         /*
1446                          * We don't need to check the matching
1447                          * slave for dups, since we're overwriting it
1448                          */
1449                         update_slave = slave;
1450                 else if (qid && qid == slave->queue_id) {
1451                         goto err_no_cmd_unlock;
1452                 }
1453         }
1454
1455         if (!update_slave)
1456                 goto err_no_cmd_unlock;
1457
1458         /* Actually set the qids for the slave */
1459         update_slave->queue_id = qid;
1460
1461         read_unlock(&bond->lock);
1462 out:
1463         rtnl_unlock();
1464         return ret;
1465
1466 err_no_cmd_unlock:
1467         read_unlock(&bond->lock);
1468 err_no_cmd:
1469         pr_info("invalid input for queue_id set for %s.\n",
1470                 bond->dev->name);
1471         ret = -EPERM;
1472         goto out;
1473 }
1474
1475 static DEVICE_ATTR(queue_id, S_IRUGO | S_IWUSR, bonding_show_queue_id,
1476                    bonding_store_queue_id);
1477
1478
1479 /*
1480  * Show and set the all_slaves_active flag.
1481  */
1482 static ssize_t bonding_show_slaves_active(struct device *d,
1483                                           struct device_attribute *attr,
1484                                           char *buf)
1485 {
1486         struct bonding *bond = to_bond(d);
1487
1488         return sprintf(buf, "%d\n", bond->params.all_slaves_active);
1489 }
1490
1491 static ssize_t bonding_store_slaves_active(struct device *d,
1492                                            struct device_attribute *attr,
1493                                            const char *buf, size_t count)
1494 {
1495         int i, new_value, ret = count;
1496         struct bonding *bond = to_bond(d);
1497         struct slave *slave;
1498
1499         if (sscanf(buf, "%d", &new_value) != 1) {
1500                 pr_err("%s: no all_slaves_active value specified.\n",
1501                        bond->dev->name);
1502                 ret = -EINVAL;
1503                 goto out;
1504         }
1505
1506         if (new_value == bond->params.all_slaves_active)
1507                 goto out;
1508
1509         if ((new_value == 0) || (new_value == 1)) {
1510                 bond->params.all_slaves_active = new_value;
1511         } else {
1512                 pr_info("%s: Ignoring invalid all_slaves_active value %d.\n",
1513                         bond->dev->name, new_value);
1514                 ret = -EINVAL;
1515                 goto out;
1516         }
1517
1518         bond_for_each_slave(bond, slave, i) {
1519                 if (!bond_is_active_slave(slave)) {
1520                         if (new_value)
1521                                 slave->inactive = 0;
1522                         else
1523                                 slave->inactive = 1;
1524                 }
1525         }
1526 out:
1527         return ret;
1528 }
1529 static DEVICE_ATTR(all_slaves_active, S_IRUGO | S_IWUSR,
1530                    bonding_show_slaves_active, bonding_store_slaves_active);
1531
1532 /*
1533  * Show and set the number of IGMP membership reports to send on link failure
1534  */
1535 static ssize_t bonding_show_resend_igmp(struct device *d,
1536                                         struct device_attribute *attr,
1537                                         char *buf)
1538 {
1539         struct bonding *bond = to_bond(d);
1540
1541         return sprintf(buf, "%d\n", bond->params.resend_igmp);
1542 }
1543
1544 static ssize_t bonding_store_resend_igmp(struct device *d,
1545                                          struct device_attribute *attr,
1546                                          const char *buf, size_t count)
1547 {
1548         int new_value, ret = count;
1549         struct bonding *bond = to_bond(d);
1550
1551         if (sscanf(buf, "%d", &new_value) != 1) {
1552                 pr_err("%s: no resend_igmp value specified.\n",
1553                        bond->dev->name);
1554                 ret = -EINVAL;
1555                 goto out;
1556         }
1557
1558         if (new_value < 0 || new_value > 255) {
1559                 pr_err("%s: Invalid resend_igmp value %d not in range 0-255; rejected.\n",
1560                        bond->dev->name, new_value);
1561                 ret = -EINVAL;
1562                 goto out;
1563         }
1564
1565         pr_info("%s: Setting resend_igmp to %d.\n",
1566                 bond->dev->name, new_value);
1567         bond->params.resend_igmp = new_value;
1568 out:
1569         return ret;
1570 }
1571
1572 static DEVICE_ATTR(resend_igmp, S_IRUGO | S_IWUSR,
1573                    bonding_show_resend_igmp, bonding_store_resend_igmp);
1574
1575 static struct attribute *per_bond_attrs[] = {
1576         &dev_attr_slaves.attr,
1577         &dev_attr_mode.attr,
1578         &dev_attr_fail_over_mac.attr,
1579         &dev_attr_arp_validate.attr,
1580         &dev_attr_arp_interval.attr,
1581         &dev_attr_arp_ip_target.attr,
1582         &dev_attr_downdelay.attr,
1583         &dev_attr_updelay.attr,
1584         &dev_attr_lacp_rate.attr,
1585         &dev_attr_ad_select.attr,
1586         &dev_attr_xmit_hash_policy.attr,
1587         &dev_attr_num_grat_arp.attr,
1588         &dev_attr_num_unsol_na.attr,
1589         &dev_attr_miimon.attr,
1590         &dev_attr_primary.attr,
1591         &dev_attr_primary_reselect.attr,
1592         &dev_attr_use_carrier.attr,
1593         &dev_attr_active_slave.attr,
1594         &dev_attr_mii_status.attr,
1595         &dev_attr_ad_aggregator.attr,
1596         &dev_attr_ad_num_ports.attr,
1597         &dev_attr_ad_actor_key.attr,
1598         &dev_attr_ad_partner_key.attr,
1599         &dev_attr_ad_partner_mac.attr,
1600         &dev_attr_queue_id.attr,
1601         &dev_attr_all_slaves_active.attr,
1602         &dev_attr_resend_igmp.attr,
1603         NULL,
1604 };
1605
1606 static struct attribute_group bonding_group = {
1607         .name = "bonding",
1608         .attrs = per_bond_attrs,
1609 };
1610
1611 /*
1612  * Initialize sysfs.  This sets up the bonding_masters file in
1613  * /sys/class/net.
1614  */
1615 int bond_create_sysfs(void)
1616 {
1617         int ret;
1618
1619         ret = netdev_class_create_file(&class_attr_bonding_masters);
1620         /*
1621          * Permit multiple loads of the module by ignoring failures to
1622          * create the bonding_masters sysfs file.  Bonding devices
1623          * created by second or subsequent loads of the module will
1624          * not be listed in, or controllable by, bonding_masters, but
1625          * will have the usual "bonding" sysfs directory.
1626          *
1627          * This is done to preserve backwards compatibility for
1628          * initscripts/sysconfig, which load bonding multiple times to
1629          * configure multiple bonding devices.
1630          */
1631         if (ret == -EEXIST) {
1632                 /* Is someone being kinky and naming a device bonding_master? */
1633                 if (__dev_get_by_name(&init_net,
1634                                       class_attr_bonding_masters.attr.name))
1635                         pr_err("network device named %s already exists in sysfs",
1636                                class_attr_bonding_masters.attr.name);
1637                 ret = 0;
1638         }
1639
1640         return ret;
1641
1642 }
1643
1644 /*
1645  * Remove /sys/class/net/bonding_masters.
1646  */
1647 void bond_destroy_sysfs(void)
1648 {
1649         netdev_class_remove_file(&class_attr_bonding_masters);
1650 }
1651
1652 /*
1653  * Initialize sysfs for each bond.  This sets up and registers
1654  * the 'bondctl' directory for each individual bond under /sys/class/net.
1655  */
1656 void bond_prepare_sysfs_group(struct bonding *bond)
1657 {
1658         bond->dev->sysfs_groups[0] = &bonding_group;
1659 }
1660