1 /*
2  * drivers/net/bond/bond_options.c - bonding options
3  * Copyright (c) 2013 Jiri Pirko <jiri@resnulli.us>
4  * Copyright (c) 2013 Scott Feldman <sfeldma@cumulusnetworks.com>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  */
11 
12 #include <linux/errno.h>
13 #include <linux/if.h>
14 #include <linux/netdevice.h>
15 #include <linux/spinlock.h>
16 #include <linux/rcupdate.h>
17 #include <linux/ctype.h>
18 #include <linux/inet.h>
19 #include "bonding.h"
20 
21 static int bond_option_active_slave_set(struct bonding *bond,
22 					const struct bond_opt_value *newval);
23 static int bond_option_miimon_set(struct bonding *bond,
24 				  const struct bond_opt_value *newval);
25 static int bond_option_updelay_set(struct bonding *bond,
26 				   const struct bond_opt_value *newval);
27 static int bond_option_downdelay_set(struct bonding *bond,
28 				     const struct bond_opt_value *newval);
29 static int bond_option_use_carrier_set(struct bonding *bond,
30 				       const struct bond_opt_value *newval);
31 static int bond_option_arp_interval_set(struct bonding *bond,
32 					const struct bond_opt_value *newval);
33 static int bond_option_arp_ip_target_add(struct bonding *bond, __be32 target);
34 static int bond_option_arp_ip_target_rem(struct bonding *bond, __be32 target);
35 static int bond_option_arp_ip_targets_set(struct bonding *bond,
36 					  const struct bond_opt_value *newval);
37 static int bond_option_arp_validate_set(struct bonding *bond,
38 					const struct bond_opt_value *newval);
39 static int bond_option_arp_all_targets_set(struct bonding *bond,
40 					   const struct bond_opt_value *newval);
41 static int bond_option_primary_set(struct bonding *bond,
42 				   const struct bond_opt_value *newval);
43 static int bond_option_primary_reselect_set(struct bonding *bond,
44 					    const struct bond_opt_value *newval);
45 static int bond_option_fail_over_mac_set(struct bonding *bond,
46 					 const struct bond_opt_value *newval);
47 static int bond_option_xmit_hash_policy_set(struct bonding *bond,
48 					    const struct bond_opt_value *newval);
49 static int bond_option_resend_igmp_set(struct bonding *bond,
50 				       const struct bond_opt_value *newval);
51 static int bond_option_num_peer_notif_set(struct bonding *bond,
52 					  const struct bond_opt_value *newval);
53 static int bond_option_all_slaves_active_set(struct bonding *bond,
54 					     const struct bond_opt_value *newval);
55 static int bond_option_min_links_set(struct bonding *bond,
56 				     const struct bond_opt_value *newval);
57 static int bond_option_lp_interval_set(struct bonding *bond,
58 				       const struct bond_opt_value *newval);
59 static int bond_option_pps_set(struct bonding *bond,
60 			       const struct bond_opt_value *newval);
61 static int bond_option_lacp_rate_set(struct bonding *bond,
62 				     const struct bond_opt_value *newval);
63 static int bond_option_ad_select_set(struct bonding *bond,
64 				     const struct bond_opt_value *newval);
65 static int bond_option_queue_id_set(struct bonding *bond,
66 				    const struct bond_opt_value *newval);
67 static int bond_option_mode_set(struct bonding *bond,
68 				const struct bond_opt_value *newval);
69 static int bond_option_slaves_set(struct bonding *bond,
70 				  const struct bond_opt_value *newval);
71 static int bond_option_tlb_dynamic_lb_set(struct bonding *bond,
72 				  const struct bond_opt_value *newval);
73 
74 
75 static const struct bond_opt_value bond_mode_tbl[] = {
76 	{ "balance-rr",    BOND_MODE_ROUNDROBIN,   BOND_VALFLAG_DEFAULT},
77 	{ "active-backup", BOND_MODE_ACTIVEBACKUP, 0},
78 	{ "balance-xor",   BOND_MODE_XOR,          0},
79 	{ "broadcast",     BOND_MODE_BROADCAST,    0},
80 	{ "802.3ad",       BOND_MODE_8023AD,       0},
81 	{ "balance-tlb",   BOND_MODE_TLB,          0},
82 	{ "balance-alb",   BOND_MODE_ALB,          0},
83 	{ NULL,            -1,                     0},
84 };
85 
86 static const struct bond_opt_value bond_pps_tbl[] = {
87 	{ "default", 1,         BOND_VALFLAG_DEFAULT},
88 	{ "maxval",  USHRT_MAX, BOND_VALFLAG_MAX},
89 	{ NULL,      -1,        0},
90 };
91 
92 static const struct bond_opt_value bond_xmit_hashtype_tbl[] = {
93 	{ "layer2",   BOND_XMIT_POLICY_LAYER2, BOND_VALFLAG_DEFAULT},
94 	{ "layer3+4", BOND_XMIT_POLICY_LAYER34, 0},
95 	{ "layer2+3", BOND_XMIT_POLICY_LAYER23, 0},
96 	{ "encap2+3", BOND_XMIT_POLICY_ENCAP23, 0},
97 	{ "encap3+4", BOND_XMIT_POLICY_ENCAP34, 0},
98 	{ NULL,       -1,                       0},
99 };
100 
101 static const struct bond_opt_value bond_arp_validate_tbl[] = {
102 	{ "none",		BOND_ARP_VALIDATE_NONE,		BOND_VALFLAG_DEFAULT},
103 	{ "active",		BOND_ARP_VALIDATE_ACTIVE,	0},
104 	{ "backup",		BOND_ARP_VALIDATE_BACKUP,	0},
105 	{ "all",		BOND_ARP_VALIDATE_ALL,		0},
106 	{ "filter",		BOND_ARP_FILTER,		0},
107 	{ "filter_active",	BOND_ARP_FILTER_ACTIVE,		0},
108 	{ "filter_backup",	BOND_ARP_FILTER_BACKUP,		0},
109 	{ NULL,			-1,				0},
110 };
111 
112 static const struct bond_opt_value bond_arp_all_targets_tbl[] = {
113 	{ "any", BOND_ARP_TARGETS_ANY, BOND_VALFLAG_DEFAULT},
114 	{ "all", BOND_ARP_TARGETS_ALL, 0},
115 	{ NULL,  -1,                   0},
116 };
117 
118 static const struct bond_opt_value bond_fail_over_mac_tbl[] = {
119 	{ "none",   BOND_FOM_NONE,   BOND_VALFLAG_DEFAULT},
120 	{ "active", BOND_FOM_ACTIVE, 0},
121 	{ "follow", BOND_FOM_FOLLOW, 0},
122 	{ NULL,     -1,              0},
123 };
124 
125 static const struct bond_opt_value bond_intmax_tbl[] = {
126 	{ "off",     0,       BOND_VALFLAG_DEFAULT},
127 	{ "maxval",  INT_MAX, BOND_VALFLAG_MAX},
128 	{ NULL,      -1,      0}
129 };
130 
131 static const struct bond_opt_value bond_lacp_rate_tbl[] = {
132 	{ "slow", AD_LACP_SLOW, 0},
133 	{ "fast", AD_LACP_FAST, 0},
134 	{ NULL,   -1,           0},
135 };
136 
137 static const struct bond_opt_value bond_ad_select_tbl[] = {
138 	{ "stable",    BOND_AD_STABLE,    BOND_VALFLAG_DEFAULT},
139 	{ "bandwidth", BOND_AD_BANDWIDTH, 0},
140 	{ "count",     BOND_AD_COUNT,     0},
141 	{ NULL,        -1,                0},
142 };
143 
144 static const struct bond_opt_value bond_num_peer_notif_tbl[] = {
145 	{ "off",     0,   0},
146 	{ "maxval",  255, BOND_VALFLAG_MAX},
147 	{ "default", 1,   BOND_VALFLAG_DEFAULT},
148 	{ NULL,      -1,  0}
149 };
150 
151 static const struct bond_opt_value bond_primary_reselect_tbl[] = {
152 	{ "always",  BOND_PRI_RESELECT_ALWAYS,  BOND_VALFLAG_DEFAULT},
153 	{ "better",  BOND_PRI_RESELECT_BETTER,  0},
154 	{ "failure", BOND_PRI_RESELECT_FAILURE, 0},
155 	{ NULL,      -1},
156 };
157 
158 static const struct bond_opt_value bond_use_carrier_tbl[] = {
159 	{ "off", 0,  0},
160 	{ "on",  1,  BOND_VALFLAG_DEFAULT},
161 	{ NULL,  -1, 0}
162 };
163 
164 static const struct bond_opt_value bond_all_slaves_active_tbl[] = {
165 	{ "off", 0,  BOND_VALFLAG_DEFAULT},
166 	{ "on",  1,  0},
167 	{ NULL,  -1, 0}
168 };
169 
170 static const struct bond_opt_value bond_resend_igmp_tbl[] = {
171 	{ "off",     0,   0},
172 	{ "maxval",  255, BOND_VALFLAG_MAX},
173 	{ "default", 1,   BOND_VALFLAG_DEFAULT},
174 	{ NULL,      -1,  0}
175 };
176 
177 static const struct bond_opt_value bond_lp_interval_tbl[] = {
178 	{ "minval",  1,       BOND_VALFLAG_MIN | BOND_VALFLAG_DEFAULT},
179 	{ "maxval",  INT_MAX, BOND_VALFLAG_MAX},
180 	{ NULL,      -1,      0},
181 };
182 
183 static const struct bond_opt_value bond_tlb_dynamic_lb_tbl[] = {
184 	{ "off", 0,  0},
185 	{ "on",  1,  BOND_VALFLAG_DEFAULT},
186 	{ NULL,  -1, 0}
187 };
188 
189 static const struct bond_option bond_opts[] = {
190 	[BOND_OPT_MODE] = {
191 		.id = BOND_OPT_MODE,
192 		.name = "mode",
193 		.desc = "bond device mode",
194 		.flags = BOND_OPTFLAG_NOSLAVES | BOND_OPTFLAG_IFDOWN,
195 		.values = bond_mode_tbl,
196 		.set = bond_option_mode_set
197 	},
198 	[BOND_OPT_PACKETS_PER_SLAVE] = {
199 		.id = BOND_OPT_PACKETS_PER_SLAVE,
200 		.name = "packets_per_slave",
201 		.desc = "Packets to send per slave in RR mode",
202 		.unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_ROUNDROBIN)),
203 		.values = bond_pps_tbl,
204 		.set = bond_option_pps_set
205 	},
206 	[BOND_OPT_XMIT_HASH] = {
207 		.id = BOND_OPT_XMIT_HASH,
208 		.name = "xmit_hash_policy",
209 		.desc = "balance-xor, 802.3ad, and tlb hashing method",
210 		.values = bond_xmit_hashtype_tbl,
211 		.set = bond_option_xmit_hash_policy_set
212 	},
213 	[BOND_OPT_ARP_VALIDATE] = {
214 		.id = BOND_OPT_ARP_VALIDATE,
215 		.name = "arp_validate",
216 		.desc = "validate src/dst of ARP probes",
217 		.unsuppmodes = BIT(BOND_MODE_8023AD) | BIT(BOND_MODE_TLB) |
218 			       BIT(BOND_MODE_ALB),
219 		.values = bond_arp_validate_tbl,
220 		.set = bond_option_arp_validate_set
221 	},
222 	[BOND_OPT_ARP_ALL_TARGETS] = {
223 		.id = BOND_OPT_ARP_ALL_TARGETS,
224 		.name = "arp_all_targets",
225 		.desc = "fail on any/all arp targets timeout",
226 		.values = bond_arp_all_targets_tbl,
227 		.set = bond_option_arp_all_targets_set
228 	},
229 	[BOND_OPT_FAIL_OVER_MAC] = {
230 		.id = BOND_OPT_FAIL_OVER_MAC,
231 		.name = "fail_over_mac",
232 		.desc = "For active-backup, do not set all slaves to the same MAC",
233 		.flags = BOND_OPTFLAG_NOSLAVES,
234 		.values = bond_fail_over_mac_tbl,
235 		.set = bond_option_fail_over_mac_set
236 	},
237 	[BOND_OPT_ARP_INTERVAL] = {
238 		.id = BOND_OPT_ARP_INTERVAL,
239 		.name = "arp_interval",
240 		.desc = "arp interval in milliseconds",
241 		.unsuppmodes = BIT(BOND_MODE_8023AD) | BIT(BOND_MODE_TLB) |
242 			       BIT(BOND_MODE_ALB),
243 		.values = bond_intmax_tbl,
244 		.set = bond_option_arp_interval_set
245 	},
246 	[BOND_OPT_ARP_TARGETS] = {
247 		.id = BOND_OPT_ARP_TARGETS,
248 		.name = "arp_ip_target",
249 		.desc = "arp targets in n.n.n.n form",
250 		.flags = BOND_OPTFLAG_RAWVAL,
251 		.set = bond_option_arp_ip_targets_set
252 	},
253 	[BOND_OPT_DOWNDELAY] = {
254 		.id = BOND_OPT_DOWNDELAY,
255 		.name = "downdelay",
256 		.desc = "Delay before considering link down, in milliseconds",
257 		.values = bond_intmax_tbl,
258 		.set = bond_option_downdelay_set
259 	},
260 	[BOND_OPT_UPDELAY] = {
261 		.id = BOND_OPT_UPDELAY,
262 		.name = "updelay",
263 		.desc = "Delay before considering link up, in milliseconds",
264 		.values = bond_intmax_tbl,
265 		.set = bond_option_updelay_set
266 	},
267 	[BOND_OPT_LACP_RATE] = {
268 		.id = BOND_OPT_LACP_RATE,
269 		.name = "lacp_rate",
270 		.desc = "LACPDU tx rate to request from 802.3ad partner",
271 		.flags = BOND_OPTFLAG_IFDOWN,
272 		.unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_8023AD)),
273 		.values = bond_lacp_rate_tbl,
274 		.set = bond_option_lacp_rate_set
275 	},
276 	[BOND_OPT_MINLINKS] = {
277 		.id = BOND_OPT_MINLINKS,
278 		.name = "min_links",
279 		.desc = "Minimum number of available links before turning on carrier",
280 		.values = bond_intmax_tbl,
281 		.set = bond_option_min_links_set
282 	},
283 	[BOND_OPT_AD_SELECT] = {
284 		.id = BOND_OPT_AD_SELECT,
285 		.name = "ad_select",
286 		.desc = "803.ad aggregation selection logic",
287 		.flags = BOND_OPTFLAG_IFDOWN,
288 		.values = bond_ad_select_tbl,
289 		.set = bond_option_ad_select_set
290 	},
291 	[BOND_OPT_NUM_PEER_NOTIF] = {
292 		.id = BOND_OPT_NUM_PEER_NOTIF,
293 		.name = "num_unsol_na",
294 		.desc = "Number of peer notifications to send on failover event",
295 		.values = bond_num_peer_notif_tbl,
296 		.set = bond_option_num_peer_notif_set
297 	},
298 	[BOND_OPT_MIIMON] = {
299 		.id = BOND_OPT_MIIMON,
300 		.name = "miimon",
301 		.desc = "Link check interval in milliseconds",
302 		.values = bond_intmax_tbl,
303 		.set = bond_option_miimon_set
304 	},
305 	[BOND_OPT_PRIMARY] = {
306 		.id = BOND_OPT_PRIMARY,
307 		.name = "primary",
308 		.desc = "Primary network device to use",
309 		.flags = BOND_OPTFLAG_RAWVAL,
310 		.unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_ACTIVEBACKUP) |
311 						BIT(BOND_MODE_TLB) |
312 						BIT(BOND_MODE_ALB)),
313 		.set = bond_option_primary_set
314 	},
315 	[BOND_OPT_PRIMARY_RESELECT] = {
316 		.id = BOND_OPT_PRIMARY_RESELECT,
317 		.name = "primary_reselect",
318 		.desc = "Reselect primary slave once it comes up",
319 		.values = bond_primary_reselect_tbl,
320 		.set = bond_option_primary_reselect_set
321 	},
322 	[BOND_OPT_USE_CARRIER] = {
323 		.id = BOND_OPT_USE_CARRIER,
324 		.name = "use_carrier",
325 		.desc = "Use netif_carrier_ok (vs MII ioctls) in miimon",
326 		.values = bond_use_carrier_tbl,
327 		.set = bond_option_use_carrier_set
328 	},
329 	[BOND_OPT_ACTIVE_SLAVE] = {
330 		.id = BOND_OPT_ACTIVE_SLAVE,
331 		.name = "active_slave",
332 		.desc = "Currently active slave",
333 		.flags = BOND_OPTFLAG_RAWVAL,
334 		.unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_ACTIVEBACKUP) |
335 						BIT(BOND_MODE_TLB) |
336 						BIT(BOND_MODE_ALB)),
337 		.set = bond_option_active_slave_set
338 	},
339 	[BOND_OPT_QUEUE_ID] = {
340 		.id = BOND_OPT_QUEUE_ID,
341 		.name = "queue_id",
342 		.desc = "Set queue id of a slave",
343 		.flags = BOND_OPTFLAG_RAWVAL,
344 		.set = bond_option_queue_id_set
345 	},
346 	[BOND_OPT_ALL_SLAVES_ACTIVE] = {
347 		.id = BOND_OPT_ALL_SLAVES_ACTIVE,
348 		.name = "all_slaves_active",
349 		.desc = "Keep all frames received on an interface by setting active flag for all slaves",
350 		.values = bond_all_slaves_active_tbl,
351 		.set = bond_option_all_slaves_active_set
352 	},
353 	[BOND_OPT_RESEND_IGMP] = {
354 		.id = BOND_OPT_RESEND_IGMP,
355 		.name = "resend_igmp",
356 		.desc = "Number of IGMP membership reports to send on link failure",
357 		.values = bond_resend_igmp_tbl,
358 		.set = bond_option_resend_igmp_set
359 	},
360 	[BOND_OPT_LP_INTERVAL] = {
361 		.id = BOND_OPT_LP_INTERVAL,
362 		.name = "lp_interval",
363 		.desc = "The number of seconds between instances where the bonding driver sends learning packets to each slave's peer switch",
364 		.values = bond_lp_interval_tbl,
365 		.set = bond_option_lp_interval_set
366 	},
367 	[BOND_OPT_SLAVES] = {
368 		.id = BOND_OPT_SLAVES,
369 		.name = "slaves",
370 		.desc = "Slave membership management",
371 		.flags = BOND_OPTFLAG_RAWVAL,
372 		.set = bond_option_slaves_set
373 	},
374 	[BOND_OPT_TLB_DYNAMIC_LB] = {
375 		.id = BOND_OPT_TLB_DYNAMIC_LB,
376 		.name = "tlb_dynamic_lb",
377 		.desc = "Enable dynamic flow shuffling",
378 		.unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_TLB)),
379 		.values = bond_tlb_dynamic_lb_tbl,
380 		.flags = BOND_OPTFLAG_IFDOWN,
381 		.set = bond_option_tlb_dynamic_lb_set,
382 	},
383 	{ }
384 };
385 
386 /* Searches for an option by name */
387 const struct bond_option *bond_opt_get_by_name(const char *name)
388 {
389 	const struct bond_option *opt;
390 	int option;
391 
392 	for (option = 0; option < BOND_OPT_LAST; option++) {
393 		opt = bond_opt_get(option);
394 		if (opt && !strcmp(opt->name, name))
395 			return opt;
396 	}
397 
398 	return NULL;
399 }
400 
401 /* Searches for a value in opt's values[] table */
402 const struct bond_opt_value *bond_opt_get_val(unsigned int option, u64 val)
403 {
404 	const struct bond_option *opt;
405 	int i;
406 
407 	opt = bond_opt_get(option);
408 	if (WARN_ON(!opt))
409 		return NULL;
410 	for (i = 0; opt->values && opt->values[i].string; i++)
411 		if (opt->values[i].value == val)
412 			return &opt->values[i];
413 
414 	return NULL;
415 }
416 
417 /* Searches for a value in opt's values[] table which matches the flagmask */
418 static const struct bond_opt_value *bond_opt_get_flags(const struct bond_option *opt,
419 						 u32 flagmask)
420 {
421 	int i;
422 
423 	for (i = 0; opt->values && opt->values[i].string; i++)
424 		if (opt->values[i].flags & flagmask)
425 			return &opt->values[i];
426 
427 	return NULL;
428 }
429 
430 /* If maxval is missing then there's no range to check. In case minval is
431  * missing then it's considered to be 0.
432  */
433 static bool bond_opt_check_range(const struct bond_option *opt, u64 val)
434 {
435 	const struct bond_opt_value *minval, *maxval;
436 
437 	minval = bond_opt_get_flags(opt, BOND_VALFLAG_MIN);
438 	maxval = bond_opt_get_flags(opt, BOND_VALFLAG_MAX);
439 	if (!maxval || (minval && val < minval->value) || val > maxval->value)
440 		return false;
441 
442 	return true;
443 }
444 
445 /**
446  * bond_opt_parse - parse option value
447  * @opt: the option to parse against
448  * @val: value to parse
449  *
450  * This function tries to extract the value from @val and check if it's
451  * a possible match for the option and returns NULL if a match isn't found,
452  * or the struct_opt_value that matched. It also strips the new line from
453  * @val->string if it's present.
454  */
455 const struct bond_opt_value *bond_opt_parse(const struct bond_option *opt,
456 					    struct bond_opt_value *val)
457 {
458 	char *p, valstr[BOND_OPT_MAX_NAMELEN + 1] = { 0, };
459 	const struct bond_opt_value *tbl;
460 	const struct bond_opt_value *ret = NULL;
461 	bool checkval;
462 	int i, rv;
463 
464 	/* No parsing if the option wants a raw val */
465 	if (opt->flags & BOND_OPTFLAG_RAWVAL)
466 		return val;
467 
468 	tbl = opt->values;
469 	if (!tbl)
470 		goto out;
471 
472 	/* ULLONG_MAX is used to bypass string processing */
473 	checkval = val->value != ULLONG_MAX;
474 	if (!checkval) {
475 		if (!val->string)
476 			goto out;
477 		p = strchr(val->string, '\n');
478 		if (p)
479 			*p = '\0';
480 		for (p = val->string; *p; p++)
481 			if (!(isdigit(*p) || isspace(*p)))
482 				break;
483 		/* The following code extracts the string to match or the value
484 		 * and sets checkval appropriately
485 		 */
486 		if (*p) {
487 			rv = sscanf(val->string, "%32s", valstr);
488 		} else {
489 			rv = sscanf(val->string, "%llu", &val->value);
490 			checkval = true;
491 		}
492 		if (!rv)
493 			goto out;
494 	}
495 
496 	for (i = 0; tbl[i].string; i++) {
497 		/* Check for exact match */
498 		if (checkval) {
499 			if (val->value == tbl[i].value)
500 				ret = &tbl[i];
501 		} else {
502 			if (!strcmp(valstr, "default") &&
503 			    (tbl[i].flags & BOND_VALFLAG_DEFAULT))
504 				ret = &tbl[i];
505 
506 			if (!strcmp(valstr, tbl[i].string))
507 				ret = &tbl[i];
508 		}
509 		/* Found an exact match */
510 		if (ret)
511 			goto out;
512 	}
513 	/* Possible range match */
514 	if (checkval && bond_opt_check_range(opt, val->value))
515 		ret = val;
516 out:
517 	return ret;
518 }
519 
520 /* Check opt's dependencies against bond mode and currently set options */
521 static int bond_opt_check_deps(struct bonding *bond,
522 			       const struct bond_option *opt)
523 {
524 	struct bond_params *params = &bond->params;
525 
526 	if (test_bit(params->mode, &opt->unsuppmodes))
527 		return -EACCES;
528 	if ((opt->flags & BOND_OPTFLAG_NOSLAVES) && bond_has_slaves(bond))
529 		return -ENOTEMPTY;
530 	if ((opt->flags & BOND_OPTFLAG_IFDOWN) && (bond->dev->flags & IFF_UP))
531 		return -EBUSY;
532 
533 	return 0;
534 }
535 
536 static void bond_opt_dep_print(struct bonding *bond,
537 			       const struct bond_option *opt)
538 {
539 	const struct bond_opt_value *modeval;
540 	struct bond_params *params;
541 
542 	params = &bond->params;
543 	modeval = bond_opt_get_val(BOND_OPT_MODE, params->mode);
544 	if (test_bit(params->mode, &opt->unsuppmodes))
545 		netdev_err(bond->dev, "option %s: mode dependency failed, not supported in mode %s(%llu)\n",
546 			   opt->name, modeval->string, modeval->value);
547 }
548 
549 static void bond_opt_error_interpret(struct bonding *bond,
550 				     const struct bond_option *opt,
551 				     int error, const struct bond_opt_value *val)
552 {
553 	const struct bond_opt_value *minval, *maxval;
554 	char *p;
555 
556 	switch (error) {
557 	case -EINVAL:
558 		if (val) {
559 			if (val->string) {
560 				/* sometimes RAWVAL opts may have new lines */
561 				p = strchr(val->string, '\n');
562 				if (p)
563 					*p = '\0';
564 				netdev_err(bond->dev, "option %s: invalid value (%s)\n",
565 					   opt->name, val->string);
566 			} else {
567 				netdev_err(bond->dev, "option %s: invalid value (%llu)\n",
568 					   opt->name, val->value);
569 			}
570 		}
571 		minval = bond_opt_get_flags(opt, BOND_VALFLAG_MIN);
572 		maxval = bond_opt_get_flags(opt, BOND_VALFLAG_MAX);
573 		if (!maxval)
574 			break;
575 		netdev_err(bond->dev, "option %s: allowed values %llu - %llu\n",
576 			   opt->name, minval ? minval->value : 0, maxval->value);
577 		break;
578 	case -EACCES:
579 		bond_opt_dep_print(bond, opt);
580 		break;
581 	case -ENOTEMPTY:
582 		netdev_err(bond->dev, "option %s: unable to set because the bond device has slaves\n",
583 			   opt->name);
584 		break;
585 	case -EBUSY:
586 		netdev_err(bond->dev, "option %s: unable to set because the bond device is up\n",
587 			   opt->name);
588 		break;
589 	default:
590 		break;
591 	}
592 }
593 
594 /**
595  * __bond_opt_set - set a bonding option
596  * @bond: target bond device
597  * @option: option to set
598  * @val: value to set it to
599  *
600  * This function is used to change the bond's option value, it can be
601  * used for both enabling/changing an option and for disabling it. RTNL lock
602  * must be obtained before calling this function.
603  */
604 int __bond_opt_set(struct bonding *bond,
605 		   unsigned int option, struct bond_opt_value *val)
606 {
607 	const struct bond_opt_value *retval = NULL;
608 	const struct bond_option *opt;
609 	int ret = -ENOENT;
610 
611 	ASSERT_RTNL();
612 
613 	opt = bond_opt_get(option);
614 	if (WARN_ON(!val) || WARN_ON(!opt))
615 		goto out;
616 	ret = bond_opt_check_deps(bond, opt);
617 	if (ret)
618 		goto out;
619 	retval = bond_opt_parse(opt, val);
620 	if (!retval) {
621 		ret = -EINVAL;
622 		goto out;
623 	}
624 	ret = opt->set(bond, retval);
625 out:
626 	if (ret)
627 		bond_opt_error_interpret(bond, opt, ret, val);
628 	else
629 		call_netdevice_notifiers(NETDEV_CHANGEINFODATA, bond->dev);
630 
631 	return ret;
632 }
633 
634 /**
635  * bond_opt_tryset_rtnl - try to acquire rtnl and call __bond_opt_set
636  * @bond: target bond device
637  * @option: option to set
638  * @buf: value to set it to
639  *
640  * This function tries to acquire RTNL without blocking and if successful
641  * calls __bond_opt_set. It is mainly used for sysfs option manipulation.
642  */
643 int bond_opt_tryset_rtnl(struct bonding *bond, unsigned int option, char *buf)
644 {
645 	struct bond_opt_value optval;
646 	int ret;
647 
648 	if (!rtnl_trylock())
649 		return restart_syscall();
650 	bond_opt_initstr(&optval, buf);
651 	ret = __bond_opt_set(bond, option, &optval);
652 	rtnl_unlock();
653 
654 	return ret;
655 }
656 
657 /**
658  * bond_opt_get - get a pointer to an option
659  * @option: option for which to return a pointer
660  *
661  * This function checks if option is valid and if so returns a pointer
662  * to its entry in the bond_opts[] option array.
663  */
664 const struct bond_option *bond_opt_get(unsigned int option)
665 {
666 	if (!BOND_OPT_VALID(option))
667 		return NULL;
668 
669 	return &bond_opts[option];
670 }
671 
672 static int bond_option_mode_set(struct bonding *bond,
673 				const struct bond_opt_value *newval)
674 {
675 	if (!bond_mode_uses_arp(newval->value) && bond->params.arp_interval) {
676 		netdev_info(bond->dev, "%s mode is incompatible with arp monitoring, start mii monitoring\n",
677 			    newval->string);
678 		/* disable arp monitoring */
679 		bond->params.arp_interval = 0;
680 		/* set miimon to default value */
681 		bond->params.miimon = BOND_DEFAULT_MIIMON;
682 		netdev_info(bond->dev, "Setting MII monitoring interval to %d\n",
683 			    bond->params.miimon);
684 	}
685 
686 	/* don't cache arp_validate between modes */
687 	bond->params.arp_validate = BOND_ARP_VALIDATE_NONE;
688 	bond->params.mode = newval->value;
689 
690 	return 0;
691 }
692 
693 static struct net_device *__bond_option_active_slave_get(struct bonding *bond,
694 							 struct slave *slave)
695 {
696 	return bond_uses_primary(bond) && slave ? slave->dev : NULL;
697 }
698 
699 struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond)
700 {
701 	struct slave *slave = rcu_dereference(bond->curr_active_slave);
702 
703 	return __bond_option_active_slave_get(bond, slave);
704 }
705 
706 static int bond_option_active_slave_set(struct bonding *bond,
707 					const struct bond_opt_value *newval)
708 {
709 	char ifname[IFNAMSIZ] = { 0, };
710 	struct net_device *slave_dev;
711 	int ret = 0;
712 
713 	sscanf(newval->string, "%15s", ifname); /* IFNAMSIZ */
714 	if (!strlen(ifname) || newval->string[0] == '\n') {
715 		slave_dev = NULL;
716 	} else {
717 		slave_dev = __dev_get_by_name(dev_net(bond->dev), ifname);
718 		if (!slave_dev)
719 			return -ENODEV;
720 	}
721 
722 	if (slave_dev) {
723 		if (!netif_is_bond_slave(slave_dev)) {
724 			netdev_err(bond->dev, "Device %s is not bonding slave\n",
725 				   slave_dev->name);
726 			return -EINVAL;
727 		}
728 
729 		if (bond->dev != netdev_master_upper_dev_get(slave_dev)) {
730 			netdev_err(bond->dev, "Device %s is not our slave\n",
731 				   slave_dev->name);
732 			return -EINVAL;
733 		}
734 	}
735 
736 	block_netpoll_tx();
737 	/* check to see if we are clearing active */
738 	if (!slave_dev) {
739 		netdev_info(bond->dev, "Clearing current active slave\n");
740 		RCU_INIT_POINTER(bond->curr_active_slave, NULL);
741 		bond_select_active_slave(bond);
742 	} else {
743 		struct slave *old_active = rtnl_dereference(bond->curr_active_slave);
744 		struct slave *new_active = bond_slave_get_rtnl(slave_dev);
745 
746 		BUG_ON(!new_active);
747 
748 		if (new_active == old_active) {
749 			/* do nothing */
750 			netdev_info(bond->dev, "%s is already the current active slave\n",
751 				    new_active->dev->name);
752 		} else {
753 			if (old_active && (new_active->link == BOND_LINK_UP) &&
754 			    bond_slave_is_up(new_active)) {
755 				netdev_info(bond->dev, "Setting %s as active slave\n",
756 					    new_active->dev->name);
757 				bond_change_active_slave(bond, new_active);
758 			} else {
759 				netdev_err(bond->dev, "Could not set %s as active slave; either %s is down or the link is down\n",
760 					   new_active->dev->name,
761 					   new_active->dev->name);
762 				ret = -EINVAL;
763 			}
764 		}
765 	}
766 	unblock_netpoll_tx();
767 
768 	return ret;
769 }
770 
771 /* There are two tricky bits here.  First, if MII monitoring is activated, then
772  * we must disable ARP monitoring.  Second, if the timer isn't running, we must
773  * start it.
774  */
775 static int bond_option_miimon_set(struct bonding *bond,
776 				  const struct bond_opt_value *newval)
777 {
778 	netdev_info(bond->dev, "Setting MII monitoring interval to %llu\n",
779 		    newval->value);
780 	bond->params.miimon = newval->value;
781 	if (bond->params.updelay)
782 		netdev_info(bond->dev, "Note: Updating updelay (to %d) since it is a multiple of the miimon value\n",
783 			bond->params.updelay * bond->params.miimon);
784 	if (bond->params.downdelay)
785 		netdev_info(bond->dev, "Note: Updating downdelay (to %d) since it is a multiple of the miimon value\n",
786 			    bond->params.downdelay * bond->params.miimon);
787 	if (newval->value && bond->params.arp_interval) {
788 		netdev_info(bond->dev, "MII monitoring cannot be used with ARP monitoring - disabling ARP monitoring...\n");
789 		bond->params.arp_interval = 0;
790 		if (bond->params.arp_validate)
791 			bond->params.arp_validate = BOND_ARP_VALIDATE_NONE;
792 	}
793 	if (bond->dev->flags & IFF_UP) {
794 		/* If the interface is up, we may need to fire off
795 		 * the MII timer. If the interface is down, the
796 		 * timer will get fired off when the open function
797 		 * is called.
798 		 */
799 		if (!newval->value) {
800 			cancel_delayed_work_sync(&bond->mii_work);
801 		} else {
802 			cancel_delayed_work_sync(&bond->arp_work);
803 			queue_delayed_work(bond->wq, &bond->mii_work, 0);
804 		}
805 	}
806 
807 	return 0;
808 }
809 
810 /* Set up and down delays. These must be multiples of the
811  * MII monitoring value, and are stored internally as the multiplier.
812  * Thus, we must translate to MS for the real world.
813  */
814 static int bond_option_updelay_set(struct bonding *bond,
815 				   const struct bond_opt_value *newval)
816 {
817 	int value = newval->value;
818 
819 	if (!bond->params.miimon) {
820 		netdev_err(bond->dev, "Unable to set up delay as MII monitoring is disabled\n");
821 		return -EPERM;
822 	}
823 	if ((value % bond->params.miimon) != 0) {
824 		netdev_warn(bond->dev, "up delay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
825 			    value, bond->params.miimon,
826 			    (value / bond->params.miimon) *
827 			    bond->params.miimon);
828 	}
829 	bond->params.updelay = value / bond->params.miimon;
830 	netdev_info(bond->dev, "Setting up delay to %d\n",
831 		    bond->params.updelay * bond->params.miimon);
832 
833 	return 0;
834 }
835 
836 static int bond_option_downdelay_set(struct bonding *bond,
837 				     const struct bond_opt_value *newval)
838 {
839 	int value = newval->value;
840 
841 	if (!bond->params.miimon) {
842 		netdev_err(bond->dev, "Unable to set down delay as MII monitoring is disabled\n");
843 		return -EPERM;
844 	}
845 	if ((value % bond->params.miimon) != 0) {
846 		netdev_warn(bond->dev, "down delay (%d) is not a multiple of miimon (%d), delay rounded to %d ms\n",
847 			    value, bond->params.miimon,
848 			    (value / bond->params.miimon) *
849 			    bond->params.miimon);
850 	}
851 	bond->params.downdelay = value / bond->params.miimon;
852 	netdev_info(bond->dev, "Setting down delay to %d\n",
853 		    bond->params.downdelay * bond->params.miimon);
854 
855 	return 0;
856 }
857 
858 static int bond_option_use_carrier_set(struct bonding *bond,
859 				       const struct bond_opt_value *newval)
860 {
861 	netdev_info(bond->dev, "Setting use_carrier to %llu\n",
862 		    newval->value);
863 	bond->params.use_carrier = newval->value;
864 
865 	return 0;
866 }
867 
868 /* There are two tricky bits here.  First, if ARP monitoring is activated, then
869  * we must disable MII monitoring.  Second, if the ARP timer isn't running,
870  * we must start it.
871  */
872 static int bond_option_arp_interval_set(struct bonding *bond,
873 					const struct bond_opt_value *newval)
874 {
875 	netdev_info(bond->dev, "Setting ARP monitoring interval to %llu\n",
876 		    newval->value);
877 	bond->params.arp_interval = newval->value;
878 	if (newval->value) {
879 		if (bond->params.miimon) {
880 			netdev_info(bond->dev, "ARP monitoring cannot be used with MII monitoring. Disabling MII monitoring\n");
881 			bond->params.miimon = 0;
882 		}
883 		if (!bond->params.arp_targets[0])
884 			netdev_info(bond->dev, "ARP monitoring has been set up, but no ARP targets have been specified\n");
885 	}
886 	if (bond->dev->flags & IFF_UP) {
887 		/* If the interface is up, we may need to fire off
888 		 * the ARP timer.  If the interface is down, the
889 		 * timer will get fired off when the open function
890 		 * is called.
891 		 */
892 		if (!newval->value) {
893 			if (bond->params.arp_validate)
894 				bond->recv_probe = NULL;
895 			cancel_delayed_work_sync(&bond->arp_work);
896 		} else {
897 			/* arp_validate can be set only in active-backup mode */
898 			bond->recv_probe = bond_arp_rcv;
899 			cancel_delayed_work_sync(&bond->mii_work);
900 			queue_delayed_work(bond->wq, &bond->arp_work, 0);
901 		}
902 	}
903 
904 	return 0;
905 }
906 
907 static void _bond_options_arp_ip_target_set(struct bonding *bond, int slot,
908 					    __be32 target,
909 					    unsigned long last_rx)
910 {
911 	__be32 *targets = bond->params.arp_targets;
912 	struct list_head *iter;
913 	struct slave *slave;
914 
915 	if (slot >= 0 && slot < BOND_MAX_ARP_TARGETS) {
916 		bond_for_each_slave(bond, slave, iter)
917 			slave->target_last_arp_rx[slot] = last_rx;
918 		targets[slot] = target;
919 	}
920 }
921 
922 static int _bond_option_arp_ip_target_add(struct bonding *bond, __be32 target)
923 {
924 	__be32 *targets = bond->params.arp_targets;
925 	int ind;
926 
927 	if (!bond_is_ip_target_ok(target)) {
928 		netdev_err(bond->dev, "invalid ARP target %pI4 specified for addition\n",
929 			   &target);
930 		return -EINVAL;
931 	}
932 
933 	if (bond_get_targets_ip(targets, target) != -1) { /* dup */
934 		netdev_err(bond->dev, "ARP target %pI4 is already present\n",
935 			   &target);
936 		return -EINVAL;
937 	}
938 
939 	ind = bond_get_targets_ip(targets, 0); /* first free slot */
940 	if (ind == -1) {
941 		netdev_err(bond->dev, "ARP target table is full!\n");
942 		return -EINVAL;
943 	}
944 
945 	netdev_info(bond->dev, "Adding ARP target %pI4\n", &target);
946 
947 	_bond_options_arp_ip_target_set(bond, ind, target, jiffies);
948 
949 	return 0;
950 }
951 
952 static int bond_option_arp_ip_target_add(struct bonding *bond, __be32 target)
953 {
954 	return _bond_option_arp_ip_target_add(bond, target);
955 }
956 
957 static int bond_option_arp_ip_target_rem(struct bonding *bond, __be32 target)
958 {
959 	__be32 *targets = bond->params.arp_targets;
960 	struct list_head *iter;
961 	struct slave *slave;
962 	unsigned long *targets_rx;
963 	int ind, i;
964 
965 	if (!bond_is_ip_target_ok(target)) {
966 		netdev_err(bond->dev, "invalid ARP target %pI4 specified for removal\n",
967 			   &target);
968 		return -EINVAL;
969 	}
970 
971 	ind = bond_get_targets_ip(targets, target);
972 	if (ind == -1) {
973 		netdev_err(bond->dev, "unable to remove nonexistent ARP target %pI4\n",
974 			   &target);
975 		return -EINVAL;
976 	}
977 
978 	if (ind == 0 && !targets[1] && bond->params.arp_interval)
979 		netdev_warn(bond->dev, "Removing last arp target with arp_interval on\n");
980 
981 	netdev_info(bond->dev, "Removing ARP target %pI4\n", &target);
982 
983 	bond_for_each_slave(bond, slave, iter) {
984 		targets_rx = slave->target_last_arp_rx;
985 		for (i = ind; (i < BOND_MAX_ARP_TARGETS-1) && targets[i+1]; i++)
986 			targets_rx[i] = targets_rx[i+1];
987 		targets_rx[i] = 0;
988 	}
989 	for (i = ind; (i < BOND_MAX_ARP_TARGETS-1) && targets[i+1]; i++)
990 		targets[i] = targets[i+1];
991 	targets[i] = 0;
992 
993 	return 0;
994 }
995 
996 void bond_option_arp_ip_targets_clear(struct bonding *bond)
997 {
998 	int i;
999 
1000 	for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
1001 		_bond_options_arp_ip_target_set(bond, i, 0, 0);
1002 }
1003 
1004 static int bond_option_arp_ip_targets_set(struct bonding *bond,
1005 					  const struct bond_opt_value *newval)
1006 {
1007 	int ret = -EPERM;
1008 	__be32 target;
1009 
1010 	if (newval->string) {
1011 		if (!in4_pton(newval->string+1, -1, (u8 *)&target, -1, NULL)) {
1012 			netdev_err(bond->dev, "invalid ARP target %pI4 specified\n",
1013 				   &target);
1014 			return ret;
1015 		}
1016 		if (newval->string[0] == '+')
1017 			ret = bond_option_arp_ip_target_add(bond, target);
1018 		else if (newval->string[0] == '-')
1019 			ret = bond_option_arp_ip_target_rem(bond, target);
1020 		else
1021 			netdev_err(bond->dev, "no command found in arp_ip_targets file - use +<addr> or -<addr>\n");
1022 	} else {
1023 		target = newval->value;
1024 		ret = bond_option_arp_ip_target_add(bond, target);
1025 	}
1026 
1027 	return ret;
1028 }
1029 
1030 static int bond_option_arp_validate_set(struct bonding *bond,
1031 					const struct bond_opt_value *newval)
1032 {
1033 	netdev_info(bond->dev, "Setting arp_validate to %s (%llu)\n",
1034 		    newval->string, newval->value);
1035 
1036 	if (bond->dev->flags & IFF_UP) {
1037 		if (!newval->value)
1038 			bond->recv_probe = NULL;
1039 		else if (bond->params.arp_interval)
1040 			bond->recv_probe = bond_arp_rcv;
1041 	}
1042 	bond->params.arp_validate = newval->value;
1043 
1044 	return 0;
1045 }
1046 
1047 static int bond_option_arp_all_targets_set(struct bonding *bond,
1048 					   const struct bond_opt_value *newval)
1049 {
1050 	netdev_info(bond->dev, "Setting arp_all_targets to %s (%llu)\n",
1051 		    newval->string, newval->value);
1052 	bond->params.arp_all_targets = newval->value;
1053 
1054 	return 0;
1055 }
1056 
1057 static int bond_option_primary_set(struct bonding *bond,
1058 				   const struct bond_opt_value *newval)
1059 {
1060 	char *p, *primary = newval->string;
1061 	struct list_head *iter;
1062 	struct slave *slave;
1063 
1064 	block_netpoll_tx();
1065 
1066 	p = strchr(primary, '\n');
1067 	if (p)
1068 		*p = '\0';
1069 	/* check to see if we are clearing primary */
1070 	if (!strlen(primary)) {
1071 		netdev_info(bond->dev, "Setting primary slave to None\n");
1072 		RCU_INIT_POINTER(bond->primary_slave, NULL);
1073 		memset(bond->params.primary, 0, sizeof(bond->params.primary));
1074 		bond_select_active_slave(bond);
1075 		goto out;
1076 	}
1077 
1078 	bond_for_each_slave(bond, slave, iter) {
1079 		if (strncmp(slave->dev->name, primary, IFNAMSIZ) == 0) {
1080 			netdev_info(bond->dev, "Setting %s as primary slave\n",
1081 				    slave->dev->name);
1082 			rcu_assign_pointer(bond->primary_slave, slave);
1083 			strcpy(bond->params.primary, slave->dev->name);
1084 			bond_select_active_slave(bond);
1085 			goto out;
1086 		}
1087 	}
1088 
1089 	if (rtnl_dereference(bond->primary_slave)) {
1090 		netdev_info(bond->dev, "Setting primary slave to None\n");
1091 		RCU_INIT_POINTER(bond->primary_slave, NULL);
1092 		bond_select_active_slave(bond);
1093 	}
1094 	strncpy(bond->params.primary, primary, IFNAMSIZ);
1095 	bond->params.primary[IFNAMSIZ - 1] = 0;
1096 
1097 	netdev_info(bond->dev, "Recording %s as primary, but it has not been enslaved to %s yet\n",
1098 		    primary, bond->dev->name);
1099 
1100 out:
1101 	unblock_netpoll_tx();
1102 
1103 	return 0;
1104 }
1105 
1106 static int bond_option_primary_reselect_set(struct bonding *bond,
1107 					    const struct bond_opt_value *newval)
1108 {
1109 	netdev_info(bond->dev, "Setting primary_reselect to %s (%llu)\n",
1110 		    newval->string, newval->value);
1111 	bond->params.primary_reselect = newval->value;
1112 
1113 	block_netpoll_tx();
1114 	bond_select_active_slave(bond);
1115 	unblock_netpoll_tx();
1116 
1117 	return 0;
1118 }
1119 
1120 static int bond_option_fail_over_mac_set(struct bonding *bond,
1121 					 const struct bond_opt_value *newval)
1122 {
1123 	netdev_info(bond->dev, "Setting fail_over_mac to %s (%llu)\n",
1124 		    newval->string, newval->value);
1125 	bond->params.fail_over_mac = newval->value;
1126 
1127 	return 0;
1128 }
1129 
1130 static int bond_option_xmit_hash_policy_set(struct bonding *bond,
1131 					    const struct bond_opt_value *newval)
1132 {
1133 	netdev_info(bond->dev, "Setting xmit hash policy to %s (%llu)\n",
1134 		    newval->string, newval->value);
1135 	bond->params.xmit_policy = newval->value;
1136 
1137 	return 0;
1138 }
1139 
1140 static int bond_option_resend_igmp_set(struct bonding *bond,
1141 				       const struct bond_opt_value *newval)
1142 {
1143 	netdev_info(bond->dev, "Setting resend_igmp to %llu\n",
1144 		    newval->value);
1145 	bond->params.resend_igmp = newval->value;
1146 
1147 	return 0;
1148 }
1149 
1150 static int bond_option_num_peer_notif_set(struct bonding *bond,
1151 				   const struct bond_opt_value *newval)
1152 {
1153 	bond->params.num_peer_notif = newval->value;
1154 
1155 	return 0;
1156 }
1157 
1158 static int bond_option_all_slaves_active_set(struct bonding *bond,
1159 					     const struct bond_opt_value *newval)
1160 {
1161 	struct list_head *iter;
1162 	struct slave *slave;
1163 
1164 	if (newval->value == bond->params.all_slaves_active)
1165 		return 0;
1166 	bond->params.all_slaves_active = newval->value;
1167 	bond_for_each_slave(bond, slave, iter) {
1168 		if (!bond_is_active_slave(slave)) {
1169 			if (newval->value)
1170 				slave->inactive = 0;
1171 			else
1172 				slave->inactive = 1;
1173 		}
1174 	}
1175 
1176 	return 0;
1177 }
1178 
1179 static int bond_option_min_links_set(struct bonding *bond,
1180 				     const struct bond_opt_value *newval)
1181 {
1182 	netdev_info(bond->dev, "Setting min links value to %llu\n",
1183 		    newval->value);
1184 	bond->params.min_links = newval->value;
1185 
1186 	return 0;
1187 }
1188 
1189 static int bond_option_lp_interval_set(struct bonding *bond,
1190 				       const struct bond_opt_value *newval)
1191 {
1192 	bond->params.lp_interval = newval->value;
1193 
1194 	return 0;
1195 }
1196 
1197 static int bond_option_pps_set(struct bonding *bond,
1198 			       const struct bond_opt_value *newval)
1199 {
1200 	bond->params.packets_per_slave = newval->value;
1201 	if (newval->value > 0) {
1202 		bond->params.reciprocal_packets_per_slave =
1203 			reciprocal_value(newval->value);
1204 	} else {
1205 		/* reciprocal_packets_per_slave is unused if
1206 		 * packets_per_slave is 0 or 1, just initialize it
1207 		 */
1208 		bond->params.reciprocal_packets_per_slave =
1209 			(struct reciprocal_value) { 0 };
1210 	}
1211 
1212 	return 0;
1213 }
1214 
1215 static int bond_option_lacp_rate_set(struct bonding *bond,
1216 				     const struct bond_opt_value *newval)
1217 {
1218 	netdev_info(bond->dev, "Setting LACP rate to %s (%llu)\n",
1219 		    newval->string, newval->value);
1220 	bond->params.lacp_fast = newval->value;
1221 	bond_3ad_update_lacp_rate(bond);
1222 
1223 	return 0;
1224 }
1225 
1226 static int bond_option_ad_select_set(struct bonding *bond,
1227 				     const struct bond_opt_value *newval)
1228 {
1229 	netdev_info(bond->dev, "Setting ad_select to %s (%llu)\n",
1230 		    newval->string, newval->value);
1231 	bond->params.ad_select = newval->value;
1232 
1233 	return 0;
1234 }
1235 
1236 static int bond_option_queue_id_set(struct bonding *bond,
1237 				    const struct bond_opt_value *newval)
1238 {
1239 	struct slave *slave, *update_slave;
1240 	struct net_device *sdev;
1241 	struct list_head *iter;
1242 	char *delim;
1243 	int ret = 0;
1244 	u16 qid;
1245 
1246 	/* delim will point to queue id if successful */
1247 	delim = strchr(newval->string, ':');
1248 	if (!delim)
1249 		goto err_no_cmd;
1250 
1251 	/* Terminate string that points to device name and bump it
1252 	 * up one, so we can read the queue id there.
1253 	 */
1254 	*delim = '\0';
1255 	if (sscanf(++delim, "%hd\n", &qid) != 1)
1256 		goto err_no_cmd;
1257 
1258 	/* Check buffer length, valid ifname and queue id */
1259 	if (!dev_valid_name(newval->string) ||
1260 	    qid > bond->dev->real_num_tx_queues)
1261 		goto err_no_cmd;
1262 
1263 	/* Get the pointer to that interface if it exists */
1264 	sdev = __dev_get_by_name(dev_net(bond->dev), newval->string);
1265 	if (!sdev)
1266 		goto err_no_cmd;
1267 
1268 	/* Search for thes slave and check for duplicate qids */
1269 	update_slave = NULL;
1270 	bond_for_each_slave(bond, slave, iter) {
1271 		if (sdev == slave->dev)
1272 			/* We don't need to check the matching
1273 			 * slave for dups, since we're overwriting it
1274 			 */
1275 			update_slave = slave;
1276 		else if (qid && qid == slave->queue_id) {
1277 			goto err_no_cmd;
1278 		}
1279 	}
1280 
1281 	if (!update_slave)
1282 		goto err_no_cmd;
1283 
1284 	/* Actually set the qids for the slave */
1285 	update_slave->queue_id = qid;
1286 
1287 out:
1288 	return ret;
1289 
1290 err_no_cmd:
1291 	netdev_info(bond->dev, "invalid input for queue_id set\n");
1292 	ret = -EPERM;
1293 	goto out;
1294 
1295 }
1296 
1297 static int bond_option_slaves_set(struct bonding *bond,
1298 				  const struct bond_opt_value *newval)
1299 {
1300 	char command[IFNAMSIZ + 1] = { 0, };
1301 	struct net_device *dev;
1302 	char *ifname;
1303 	int ret;
1304 
1305 	sscanf(newval->string, "%16s", command); /* IFNAMSIZ*/
1306 	ifname = command + 1;
1307 	if ((strlen(command) <= 1) ||
1308 	    !dev_valid_name(ifname))
1309 		goto err_no_cmd;
1310 
1311 	dev = __dev_get_by_name(dev_net(bond->dev), ifname);
1312 	if (!dev) {
1313 		netdev_info(bond->dev, "interface %s does not exist!\n",
1314 			    ifname);
1315 		ret = -ENODEV;
1316 		goto out;
1317 	}
1318 
1319 	switch (command[0]) {
1320 	case '+':
1321 		netdev_info(bond->dev, "Adding slave %s\n", dev->name);
1322 		ret = bond_enslave(bond->dev, dev);
1323 		break;
1324 
1325 	case '-':
1326 		netdev_info(bond->dev, "Removing slave %s\n", dev->name);
1327 		ret = bond_release(bond->dev, dev);
1328 		break;
1329 
1330 	default:
1331 		goto err_no_cmd;
1332 	}
1333 
1334 out:
1335 	return ret;
1336 
1337 err_no_cmd:
1338 	netdev_err(bond->dev, "no command found in slaves file - use +ifname or -ifname\n");
1339 	ret = -EPERM;
1340 	goto out;
1341 }
1342 
1343 static int bond_option_tlb_dynamic_lb_set(struct bonding *bond,
1344 					  const struct bond_opt_value *newval)
1345 {
1346 	netdev_info(bond->dev, "Setting dynamic-lb to %s (%llu)\n",
1347 		    newval->string, newval->value);
1348 	bond->params.tlb_dynamic_lb = newval->value;
1349 
1350 	return 0;
1351 }
1352