bond_options.c 28.0 KB
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/*
 * drivers/net/bond/bond_options.c - bonding options
 * Copyright (c) 2013 Jiri Pirko <jiri@resnulli.us>
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 * Copyright (c) 2013 Scott Feldman <sfeldma@cumulusnetworks.com>
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 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/errno.h>
#include <linux/if.h>
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#include <linux/netdevice.h>
#include <linux/rwlock.h>
#include <linux/rcupdate.h>
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#include <linux/ctype.h>
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#include "bonding.h"

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static struct bond_opt_value bond_mode_tbl[] = {
	{ "balance-rr",    BOND_MODE_ROUNDROBIN,   BOND_VALFLAG_DEFAULT},
	{ "active-backup", BOND_MODE_ACTIVEBACKUP, 0},
	{ "balance-xor",   BOND_MODE_XOR,          0},
	{ "broadcast",     BOND_MODE_BROADCAST,    0},
	{ "802.3ad",       BOND_MODE_8023AD,       0},
	{ "balance-tlb",   BOND_MODE_TLB,          0},
	{ "balance-alb",   BOND_MODE_ALB,          0},
	{ NULL,            -1,                     0},
};

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static struct bond_opt_value bond_pps_tbl[] = {
	{ "default", 1,         BOND_VALFLAG_DEFAULT},
	{ "maxval",  USHRT_MAX, BOND_VALFLAG_MAX},
	{ NULL,      -1,        0},
};

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static struct bond_opt_value bond_xmit_hashtype_tbl[] = {
	{ "layer2",   BOND_XMIT_POLICY_LAYER2, BOND_VALFLAG_DEFAULT},
	{ "layer3+4", BOND_XMIT_POLICY_LAYER34, 0},
	{ "layer2+3", BOND_XMIT_POLICY_LAYER23, 0},
	{ "encap2+3", BOND_XMIT_POLICY_ENCAP23, 0},
	{ "encap3+4", BOND_XMIT_POLICY_ENCAP34, 0},
	{ NULL,       -1,                       0},
};

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static struct bond_opt_value bond_arp_validate_tbl[] = {
	{ "none",   BOND_ARP_VALIDATE_NONE,   BOND_VALFLAG_DEFAULT},
	{ "active", BOND_ARP_VALIDATE_ACTIVE, 0},
	{ "backup", BOND_ARP_VALIDATE_BACKUP, 0},
	{ "all",    BOND_ARP_VALIDATE_ALL,    0},
	{ NULL,     -1,                       0},
};

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static struct bond_opt_value bond_arp_all_targets_tbl[] = {
	{ "any", BOND_ARP_TARGETS_ANY, BOND_VALFLAG_DEFAULT},
	{ "all", BOND_ARP_TARGETS_ALL, 0},
	{ NULL,  -1,                   0},
};

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static struct bond_option bond_opts[] = {
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	[BOND_OPT_MODE] = {
		.id = BOND_OPT_MODE,
		.name = "mode",
		.desc = "bond device mode",
		.flags = BOND_OPTFLAG_NOSLAVES | BOND_OPTFLAG_IFDOWN,
		.values = bond_mode_tbl,
		.set = bond_option_mode_set
	},
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	[BOND_OPT_PACKETS_PER_SLAVE] = {
		.id = BOND_OPT_PACKETS_PER_SLAVE,
		.name = "packets_per_slave",
		.desc = "Packets to send per slave in RR mode",
		.unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_ROUNDROBIN)),
		.values = bond_pps_tbl,
		.set = bond_option_pps_set
	},
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	[BOND_OPT_XMIT_HASH] = {
		.id = BOND_OPT_XMIT_HASH,
		.name = "xmit_hash_policy",
		.desc = "balance-xor and 802.3ad hashing method",
		.values = bond_xmit_hashtype_tbl,
		.set = bond_option_xmit_hash_policy_set
	},
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	[BOND_OPT_ARP_VALIDATE] = {
		.id = BOND_OPT_ARP_VALIDATE,
		.name = "arp_validate",
		.desc = "validate src/dst of ARP probes",
		.unsuppmodes = BOND_MODE_ALL_EX(BIT(BOND_MODE_ACTIVEBACKUP)),
		.values = bond_arp_validate_tbl,
		.set = bond_option_arp_validate_set
	},
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	[BOND_OPT_ARP_ALL_TARGETS] = {
		.id = BOND_OPT_ARP_ALL_TARGETS,
		.name = "arp_all_targets",
		.desc = "fail on any/all arp targets timeout",
		.values = bond_arp_all_targets_tbl,
		.set = bond_option_arp_all_targets_set
	},
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	{ }
};

/* Searches for a value in opt's values[] table */
struct bond_opt_value *bond_opt_get_val(unsigned int option, u64 val)
{
	struct bond_option *opt;
	int i;

	opt = bond_opt_get(option);
	if (WARN_ON(!opt))
		return NULL;
	for (i = 0; opt->values && opt->values[i].string; i++)
		if (opt->values[i].value == val)
			return &opt->values[i];

	return NULL;
}

/* Searches for a value in opt's values[] table which matches the flagmask */
static struct bond_opt_value *bond_opt_get_flags(const struct bond_option *opt,
						 u32 flagmask)
{
	int i;

	for (i = 0; opt->values && opt->values[i].string; i++)
		if (opt->values[i].flags & flagmask)
			return &opt->values[i];

	return NULL;
}

/* If maxval is missing then there's no range to check. In case minval is
 * missing then it's considered to be 0.
 */
static bool bond_opt_check_range(const struct bond_option *opt, u64 val)
{
	struct bond_opt_value *minval, *maxval;

	minval = bond_opt_get_flags(opt, BOND_VALFLAG_MIN);
	maxval = bond_opt_get_flags(opt, BOND_VALFLAG_MAX);
	if (!maxval || (minval && val < minval->value) || val > maxval->value)
		return false;

	return true;
}

/**
 * bond_opt_parse - parse option value
 * @opt: the option to parse against
 * @val: value to parse
 *
 * This function tries to extract the value from @val and check if it's
 * a possible match for the option and returns NULL if a match isn't found,
 * or the struct_opt_value that matched. It also strips the new line from
 * @val->string if it's present.
 */
struct bond_opt_value *bond_opt_parse(const struct bond_option *opt,
				      struct bond_opt_value *val)
{
	char *p, valstr[BOND_OPT_MAX_NAMELEN + 1] = { 0, };
	struct bond_opt_value *tbl, *ret = NULL;
	bool checkval;
	int i, rv;

	/* No parsing if the option wants a raw val */
	if (opt->flags & BOND_OPTFLAG_RAWVAL)
		return val;

	tbl = opt->values;
	if (!tbl)
		goto out;

	/* ULLONG_MAX is used to bypass string processing */
	checkval = val->value != ULLONG_MAX;
	if (!checkval) {
		if (!val->string)
			goto out;
		p = strchr(val->string, '\n');
		if (p)
			*p = '\0';
		for (p = val->string; *p; p++)
			if (!(isdigit(*p) || isspace(*p)))
				break;
		/* The following code extracts the string to match or the value
		 * and sets checkval appropriately
		 */
		if (*p) {
			rv = sscanf(val->string, "%32s", valstr);
		} else {
			rv = sscanf(val->string, "%llu", &val->value);
			checkval = true;
		}
		if (!rv)
			goto out;
	}

	for (i = 0; tbl[i].string; i++) {
		/* Check for exact match */
		if (checkval) {
			if (val->value == tbl[i].value)
				ret = &tbl[i];
		} else {
			if (!strcmp(valstr, "default") &&
			    (tbl[i].flags & BOND_VALFLAG_DEFAULT))
				ret = &tbl[i];

			if (!strcmp(valstr, tbl[i].string))
				ret = &tbl[i];
		}
		/* Found an exact match */
		if (ret)
			goto out;
	}
	/* Possible range match */
	if (checkval && bond_opt_check_range(opt, val->value))
		ret = val;
out:
	return ret;
}

/* Check opt's dependencies against bond mode and currently set options */
static int bond_opt_check_deps(struct bonding *bond,
			       const struct bond_option *opt)
{
	struct bond_params *params = &bond->params;

	if (test_bit(params->mode, &opt->unsuppmodes))
		return -EACCES;
	if ((opt->flags & BOND_OPTFLAG_NOSLAVES) && bond_has_slaves(bond))
		return -ENOTEMPTY;
	if ((opt->flags & BOND_OPTFLAG_IFDOWN) && (bond->dev->flags & IFF_UP))
		return -EBUSY;

	return 0;
}

static void bond_opt_dep_print(struct bonding *bond,
			       const struct bond_option *opt)
{
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	struct bond_opt_value *modeval;
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	struct bond_params *params;

	params = &bond->params;
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	modeval = bond_opt_get_val(BOND_OPT_MODE, params->mode);
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	if (test_bit(params->mode, &opt->unsuppmodes))
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		pr_err("%s: option %s: mode dependency failed, not supported in mode %s(%llu)\n",
		       bond->dev->name, opt->name,
		       modeval->string, modeval->value);
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}

static void bond_opt_error_interpret(struct bonding *bond,
				     const struct bond_option *opt,
				     int error, struct bond_opt_value *val)
{
	struct bond_opt_value *minval, *maxval;
	char *p;

	switch (error) {
	case -EINVAL:
		if (val) {
			if (val->string) {
				/* sometimes RAWVAL opts may have new lines */
				p = strchr(val->string, '\n');
				if (p)
					*p = '\0';
				pr_err("%s: option %s: invalid value (%s).\n",
				       bond->dev->name, opt->name, val->string);
			} else {
				pr_err("%s: option %s: invalid value (%llu).\n",
				       bond->dev->name, opt->name, val->value);
			}
		}
		minval = bond_opt_get_flags(opt, BOND_VALFLAG_MIN);
		maxval = bond_opt_get_flags(opt, BOND_VALFLAG_MAX);
		if (!maxval)
			break;
		pr_err("%s: option %s: allowed values %llu - %llu.\n",
		       bond->dev->name, opt->name, minval ? minval->value : 0,
		       maxval->value);
		break;
	case -EACCES:
		bond_opt_dep_print(bond, opt);
		break;
	case -ENOTEMPTY:
		pr_err("%s: option %s: unable to set because the bond device has slaves.\n",
		       bond->dev->name, opt->name);
		break;
	case -EBUSY:
		pr_err("%s: option %s: unable to set because the bond device is up.\n",
		       bond->dev->name, opt->name);
		break;
	default:
		break;
	}
}

/**
 * __bond_opt_set - set a bonding option
 * @bond: target bond device
 * @option: option to set
 * @val: value to set it to
 *
 * This function is used to change the bond's option value, it can be
 * used for both enabling/changing an option and for disabling it. RTNL lock
 * must be obtained before calling this function.
 */
int __bond_opt_set(struct bonding *bond,
		   unsigned int option, struct bond_opt_value *val)
{
	struct bond_opt_value *retval = NULL;
	const struct bond_option *opt;
	int ret = -ENOENT;

	ASSERT_RTNL();

	opt = bond_opt_get(option);
	if (WARN_ON(!val) || WARN_ON(!opt))
		goto out;
	ret = bond_opt_check_deps(bond, opt);
	if (ret)
		goto out;
	retval = bond_opt_parse(opt, val);
	if (!retval) {
		ret = -EINVAL;
		goto out;
	}
	ret = opt->set(bond, retval);
out:
	if (ret)
		bond_opt_error_interpret(bond, opt, ret, val);

	return ret;
}

/**
 * bond_opt_tryset_rtnl - try to acquire rtnl and call __bond_opt_set
 * @bond: target bond device
 * @option: option to set
 * @buf: value to set it to
 *
 * This function tries to acquire RTNL without blocking and if successful
 * calls __bond_opt_set. It is mainly used for sysfs option manipulation.
 */
int bond_opt_tryset_rtnl(struct bonding *bond, unsigned int option, char *buf)
{
	struct bond_opt_value optval;
	int ret;

	if (!rtnl_trylock())
		return restart_syscall();
	bond_opt_initstr(&optval, buf);
	ret = __bond_opt_set(bond, option, &optval);
	rtnl_unlock();

	return ret;
}

/**
 * bond_opt_get - get a pointer to an option
 * @option: option for which to return a pointer
 *
 * This function checks if option is valid and if so returns a pointer
 * to its entry in the bond_opts[] option array.
 */
struct bond_option *bond_opt_get(unsigned int option)
{
	if (!BOND_OPT_VALID(option))
		return NULL;

	return &bond_opts[option];
}

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int bond_option_mode_set(struct bonding *bond, struct bond_opt_value *newval)
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{
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	if (BOND_NO_USES_ARP(newval->value) && bond->params.arp_interval) {
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		pr_info("%s: %s mode is incompatible with arp monitoring, start mii monitoring\n",
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			bond->dev->name, newval->string);
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		/* disable arp monitoring */
		bond->params.arp_interval = 0;
		/* set miimon to default value */
		bond->params.miimon = BOND_DEFAULT_MIIMON;
		pr_info("%s: Setting MII monitoring interval to %d.\n",
			bond->dev->name, bond->params.miimon);
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	}

	/* don't cache arp_validate between modes */
	bond->params.arp_validate = BOND_ARP_VALIDATE_NONE;
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	bond->params.mode = newval->value;

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	return 0;
}
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static struct net_device *__bond_option_active_slave_get(struct bonding *bond,
							 struct slave *slave)
{
	return USES_PRIMARY(bond->params.mode) && slave ? slave->dev : NULL;
}

struct net_device *bond_option_active_slave_get_rcu(struct bonding *bond)
{
	struct slave *slave = rcu_dereference(bond->curr_active_slave);

	return __bond_option_active_slave_get(bond, slave);
}

struct net_device *bond_option_active_slave_get(struct bonding *bond)
{
	return __bond_option_active_slave_get(bond, bond->curr_active_slave);
}

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int bond_option_active_slave_set(struct bonding *bond,
				 struct net_device *slave_dev)
{
	int ret = 0;

	if (slave_dev) {
		if (!netif_is_bond_slave(slave_dev)) {
			pr_err("Device %s is not bonding slave.\n",
			       slave_dev->name);
			return -EINVAL;
		}

		if (bond->dev != netdev_master_upper_dev_get(slave_dev)) {
			pr_err("%s: Device %s is not our slave.\n",
			       bond->dev->name, slave_dev->name);
			return -EINVAL;
		}
	}

	if (!USES_PRIMARY(bond->params.mode)) {
		pr_err("%s: Unable to change active slave; %s is in mode %d\n",
		       bond->dev->name, bond->dev->name, bond->params.mode);
		return -EINVAL;
	}

	block_netpoll_tx();
	write_lock_bh(&bond->curr_slave_lock);

	/* check to see if we are clearing active */
	if (!slave_dev) {
		pr_info("%s: Clearing current active slave.\n",
		bond->dev->name);
		rcu_assign_pointer(bond->curr_active_slave, NULL);
		bond_select_active_slave(bond);
	} else {
		struct slave *old_active = bond->curr_active_slave;
		struct slave *new_active = bond_slave_get_rtnl(slave_dev);

		BUG_ON(!new_active);

		if (new_active == old_active) {
			/* do nothing */
			pr_info("%s: %s is already the current active slave.\n",
				bond->dev->name, new_active->dev->name);
		} else {
			if (old_active && (new_active->link == BOND_LINK_UP) &&
			    IS_UP(new_active->dev)) {
				pr_info("%s: Setting %s as active slave.\n",
					bond->dev->name, new_active->dev->name);
				bond_change_active_slave(bond, new_active);
			} else {
				pr_err("%s: Could not set %s as active slave; either %s is down or the link is down.\n",
				       bond->dev->name, new_active->dev->name,
				       new_active->dev->name);
				ret = -EINVAL;
			}
		}
	}

	write_unlock_bh(&bond->curr_slave_lock);
	unblock_netpoll_tx();
	return ret;
}
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int bond_option_miimon_set(struct bonding *bond, int miimon)
{
	if (miimon < 0) {
		pr_err("%s: Invalid miimon value %d not in range %d-%d; rejected.\n",
		       bond->dev->name, miimon, 0, INT_MAX);
		return -EINVAL;
	}
	pr_info("%s: Setting MII monitoring interval to %d.\n",
		bond->dev->name, miimon);
	bond->params.miimon = miimon;
	if (bond->params.updelay)
		pr_info("%s: Note: Updating updelay (to %d) since it is a multiple of the miimon value.\n",
			bond->dev->name,
			bond->params.updelay * bond->params.miimon);
	if (bond->params.downdelay)
		pr_info("%s: Note: Updating downdelay (to %d) since it is a multiple of the miimon value.\n",
			bond->dev->name,
			bond->params.downdelay * bond->params.miimon);
	if (miimon && bond->params.arp_interval) {
		pr_info("%s: MII monitoring cannot be used with ARP monitoring. Disabling ARP monitoring...\n",
			bond->dev->name);
		bond->params.arp_interval = 0;
		if (bond->params.arp_validate)
			bond->params.arp_validate = BOND_ARP_VALIDATE_NONE;
	}
	if (bond->dev->flags & IFF_UP) {
		/* If the interface is up, we may need to fire off
		 * the MII timer. If the interface is down, the
		 * timer will get fired off when the open function
		 * is called.
		 */
		if (!miimon) {
			cancel_delayed_work_sync(&bond->mii_work);
		} else {
			cancel_delayed_work_sync(&bond->arp_work);
			queue_delayed_work(bond->wq, &bond->mii_work, 0);
		}
	}
	return 0;
}
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int bond_option_updelay_set(struct bonding *bond, int updelay)
{
	if (!(bond->params.miimon)) {
		pr_err("%s: Unable to set up delay as MII monitoring is disabled\n",
		       bond->dev->name);
		return -EPERM;
	}

	if (updelay < 0) {
		pr_err("%s: Invalid up delay value %d not in range %d-%d; rejected.\n",
		       bond->dev->name, updelay, 0, INT_MAX);
		return -EINVAL;
	} else {
		if ((updelay % bond->params.miimon) != 0) {
			pr_warn("%s: Warning: up delay (%d) is not a multiple of miimon (%d), updelay rounded to %d ms\n",
				bond->dev->name, updelay,
				bond->params.miimon,
				(updelay / bond->params.miimon) *
				bond->params.miimon);
		}
		bond->params.updelay = updelay / bond->params.miimon;
		pr_info("%s: Setting up delay to %d.\n",
			bond->dev->name,
			bond->params.updelay * bond->params.miimon);
	}

	return 0;
}
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int bond_option_downdelay_set(struct bonding *bond, int downdelay)
{
	if (!(bond->params.miimon)) {
		pr_err("%s: Unable to set down delay as MII monitoring is disabled\n",
		       bond->dev->name);
		return -EPERM;
	}

	if (downdelay < 0) {
		pr_err("%s: Invalid down delay value %d not in range %d-%d; rejected.\n",
		       bond->dev->name, downdelay, 0, INT_MAX);
		return -EINVAL;
	} else {
		if ((downdelay % bond->params.miimon) != 0) {
			pr_warn("%s: Warning: down delay (%d) is not a multiple of miimon (%d), delay rounded to %d ms\n",
				bond->dev->name, downdelay,
				bond->params.miimon,
				(downdelay / bond->params.miimon) *
				bond->params.miimon);
		}
		bond->params.downdelay = downdelay / bond->params.miimon;
		pr_info("%s: Setting down delay to %d.\n",
			bond->dev->name,
			bond->params.downdelay * bond->params.miimon);
	}

	return 0;
}
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int bond_option_use_carrier_set(struct bonding *bond, int use_carrier)
{
	if ((use_carrier == 0) || (use_carrier == 1)) {
		bond->params.use_carrier = use_carrier;
		pr_info("%s: Setting use_carrier to %d.\n",
			bond->dev->name, use_carrier);
	} else {
		pr_info("%s: Ignoring invalid use_carrier value %d.\n",
			bond->dev->name, use_carrier);
	}

	return 0;
}
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int bond_option_arp_interval_set(struct bonding *bond, int arp_interval)
{
	if (arp_interval < 0) {
		pr_err("%s: Invalid arp_interval value %d not in range 0-%d; rejected.\n",
		       bond->dev->name, arp_interval, INT_MAX);
		return -EINVAL;
	}
	if (BOND_NO_USES_ARP(bond->params.mode)) {
		pr_info("%s: ARP monitoring cannot be used with ALB/TLB/802.3ad. Only MII monitoring is supported on %s.\n",
			bond->dev->name, bond->dev->name);
		return -EINVAL;
	}
	pr_info("%s: Setting ARP monitoring interval to %d.\n",
		bond->dev->name, arp_interval);
	bond->params.arp_interval = arp_interval;
	if (arp_interval) {
		if (bond->params.miimon) {
			pr_info("%s: ARP monitoring cannot be used with MII monitoring. %s Disabling MII monitoring.\n",
				bond->dev->name, bond->dev->name);
			bond->params.miimon = 0;
		}
		if (!bond->params.arp_targets[0])
			pr_info("%s: ARP monitoring has been set up, but no ARP targets have been specified.\n",
				bond->dev->name);
	}
	if (bond->dev->flags & IFF_UP) {
		/* If the interface is up, we may need to fire off
		 * the ARP timer.  If the interface is down, the
		 * timer will get fired off when the open function
		 * is called.
		 */
		if (!arp_interval) {
			if (bond->params.arp_validate)
				bond->recv_probe = NULL;
			cancel_delayed_work_sync(&bond->arp_work);
		} else {
			/* arp_validate can be set only in active-backup mode */
			if (bond->params.arp_validate)
				bond->recv_probe = bond_arp_rcv;
			cancel_delayed_work_sync(&bond->mii_work);
			queue_delayed_work(bond->wq, &bond->arp_work, 0);
		}
	}

	return 0;
}
635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764

static void _bond_options_arp_ip_target_set(struct bonding *bond, int slot,
					    __be32 target,
					    unsigned long last_rx)
{
	__be32 *targets = bond->params.arp_targets;
	struct list_head *iter;
	struct slave *slave;

	if (slot >= 0 && slot < BOND_MAX_ARP_TARGETS) {
		bond_for_each_slave(bond, slave, iter)
			slave->target_last_arp_rx[slot] = last_rx;
		targets[slot] = target;
	}
}

static int _bond_option_arp_ip_target_add(struct bonding *bond, __be32 target)
{
	__be32 *targets = bond->params.arp_targets;
	int ind;

	if (IS_IP_TARGET_UNUSABLE_ADDRESS(target)) {
		pr_err("%s: invalid ARP target %pI4 specified for addition\n",
		       bond->dev->name, &target);
		return -EINVAL;
	}

	if (bond_get_targets_ip(targets, target) != -1) { /* dup */
		pr_err("%s: ARP target %pI4 is already present\n",
		       bond->dev->name, &target);
		return -EINVAL;
	}

	ind = bond_get_targets_ip(targets, 0); /* first free slot */
	if (ind == -1) {
		pr_err("%s: ARP target table is full!\n",
		       bond->dev->name);
		return -EINVAL;
	}

	pr_info("%s: adding ARP target %pI4.\n", bond->dev->name, &target);

	_bond_options_arp_ip_target_set(bond, ind, target, jiffies);

	return 0;
}

int bond_option_arp_ip_target_add(struct bonding *bond, __be32 target)
{
	int ret;

	/* not to race with bond_arp_rcv */
	write_lock_bh(&bond->lock);
	ret = _bond_option_arp_ip_target_add(bond, target);
	write_unlock_bh(&bond->lock);

	return ret;
}

int bond_option_arp_ip_target_rem(struct bonding *bond, __be32 target)
{
	__be32 *targets = bond->params.arp_targets;
	struct list_head *iter;
	struct slave *slave;
	unsigned long *targets_rx;
	int ind, i;

	if (IS_IP_TARGET_UNUSABLE_ADDRESS(target)) {
		pr_err("%s: invalid ARP target %pI4 specified for removal\n",
		       bond->dev->name, &target);
		return -EINVAL;
	}

	ind = bond_get_targets_ip(targets, target);
	if (ind == -1) {
		pr_err("%s: unable to remove nonexistent ARP target %pI4.\n",
		       bond->dev->name, &target);
		return -EINVAL;
	}

	if (ind == 0 && !targets[1] && bond->params.arp_interval)
		pr_warn("%s: removing last arp target with arp_interval on\n",
			bond->dev->name);

	pr_info("%s: removing ARP target %pI4.\n", bond->dev->name,
		&target);

	/* not to race with bond_arp_rcv */
	write_lock_bh(&bond->lock);

	bond_for_each_slave(bond, slave, iter) {
		targets_rx = slave->target_last_arp_rx;
		for (i = ind; (i < BOND_MAX_ARP_TARGETS-1) && targets[i+1]; i++)
			targets_rx[i] = targets_rx[i+1];
		targets_rx[i] = 0;
	}
	for (i = ind; (i < BOND_MAX_ARP_TARGETS-1) && targets[i+1]; i++)
		targets[i] = targets[i+1];
	targets[i] = 0;

	write_unlock_bh(&bond->lock);

	return 0;
}

int bond_option_arp_ip_targets_set(struct bonding *bond, __be32 *targets,
				   int count)
{
	int i, ret = 0;

	/* not to race with bond_arp_rcv */
	write_lock_bh(&bond->lock);

	/* clear table */
	for (i = 0; i < BOND_MAX_ARP_TARGETS; i++)
		_bond_options_arp_ip_target_set(bond, i, 0, 0);

	if (count == 0 && bond->params.arp_interval)
		pr_warn("%s: removing last arp target with arp_interval on\n",
			bond->dev->name);

	for (i = 0; i < count; i++) {
		ret = _bond_option_arp_ip_target_add(bond, targets[i]);
		if (ret)
			break;
	}

	write_unlock_bh(&bond->lock);
	return ret;
}
765

766 767
int bond_option_arp_validate_set(struct bonding *bond,
				 struct bond_opt_value *newval)
768
{
769 770
	pr_info("%s: setting arp_validate to %s (%llu).\n",
		bond->dev->name, newval->string, newval->value);
771 772

	if (bond->dev->flags & IFF_UP) {
773
		if (!newval->value)
774 775 776 777
			bond->recv_probe = NULL;
		else if (bond->params.arp_interval)
			bond->recv_probe = bond_arp_rcv;
	}
778
	bond->params.arp_validate = newval->value;
779 780 781

	return 0;
}
782

783 784
int bond_option_arp_all_targets_set(struct bonding *bond,
				    struct bond_opt_value *newval)
785
{
786 787 788
	pr_info("%s: setting arp_all_targets to %s (%llu).\n",
		bond->dev->name, newval->string, newval->value);
	bond->params.arp_all_targets = newval->value;
789 790 791

	return 0;
}
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int bond_option_primary_set(struct bonding *bond, const char *primary)
{
	struct list_head *iter;
	struct slave *slave;
	int err = 0;

	block_netpoll_tx();
	read_lock(&bond->lock);
	write_lock_bh(&bond->curr_slave_lock);

	if (!USES_PRIMARY(bond->params.mode)) {
		pr_err("%s: Unable to set primary slave; %s is in mode %d\n",
		       bond->dev->name, bond->dev->name, bond->params.mode);
		err = -EINVAL;
		goto out;
	}

	/* check to see if we are clearing primary */
	if (!strlen(primary)) {
		pr_info("%s: Setting primary slave to None.\n",
			bond->dev->name);
		bond->primary_slave = NULL;
		memset(bond->params.primary, 0, sizeof(bond->params.primary));
		bond_select_active_slave(bond);
		goto out;
	}

	bond_for_each_slave(bond, slave, iter) {
		if (strncmp(slave->dev->name, primary, IFNAMSIZ) == 0) {
			pr_info("%s: Setting %s as primary slave.\n",
				bond->dev->name, slave->dev->name);
			bond->primary_slave = slave;
			strcpy(bond->params.primary, slave->dev->name);
			bond_select_active_slave(bond);
			goto out;
		}
	}

	strncpy(bond->params.primary, primary, IFNAMSIZ);
	bond->params.primary[IFNAMSIZ - 1] = 0;

	pr_info("%s: Recording %s as primary, but it has not been enslaved to %s yet.\n",
		bond->dev->name, primary, bond->dev->name);

out:
	write_unlock_bh(&bond->curr_slave_lock);
	read_unlock(&bond->lock);
	unblock_netpoll_tx();

	return err;
}
844 845 846

int bond_option_primary_reselect_set(struct bonding *bond, int primary_reselect)
{
847 848 849 850 851 852
	if (bond_parm_tbl_lookup(primary_reselect, pri_reselect_tbl) < 0) {
		pr_err("%s: Ignoring invalid primary_reselect value %d.\n",
		       bond->dev->name, primary_reselect);
		return -EINVAL;
	}

853 854 855 856 857 858 859 860 861 862 863 864 865
	bond->params.primary_reselect = primary_reselect;
	pr_info("%s: setting primary_reselect to %s (%d).\n",
		bond->dev->name, pri_reselect_tbl[primary_reselect].modename,
		primary_reselect);

	block_netpoll_tx();
	write_lock_bh(&bond->curr_slave_lock);
	bond_select_active_slave(bond);
	write_unlock_bh(&bond->curr_slave_lock);
	unblock_netpoll_tx();

	return 0;
}
866 867 868

int bond_option_fail_over_mac_set(struct bonding *bond, int fail_over_mac)
{
869 870 871 872 873 874
	if (bond_parm_tbl_lookup(fail_over_mac, fail_over_mac_tbl) < 0) {
		pr_err("%s: Ignoring invalid fail_over_mac value %d.\n",
		       bond->dev->name, fail_over_mac);
		return -EINVAL;
	}

875 876 877 878 879 880 881 882 883 884 885 886 887
	if (bond_has_slaves(bond)) {
		pr_err("%s: Can't alter fail_over_mac with slaves in bond.\n",
		       bond->dev->name);
		return -EPERM;
	}

	bond->params.fail_over_mac = fail_over_mac;
	pr_info("%s: Setting fail_over_mac to %s (%d).\n",
		bond->dev->name, fail_over_mac_tbl[fail_over_mac].modename,
		fail_over_mac);

	return 0;
}
888

889 890
int bond_option_xmit_hash_policy_set(struct bonding *bond,
				     struct bond_opt_value *newval)
891
{
892 893 894
	pr_info("%s: setting xmit hash policy to %s (%llu).\n",
		bond->dev->name, newval->string, newval->value);
	bond->params.xmit_policy = newval->value;
895 896 897

	return 0;
}
898 899 900 901 902 903 904 905 906 907 908 909 910 911 912

int bond_option_resend_igmp_set(struct bonding *bond, int resend_igmp)
{
	if (resend_igmp < 0 || resend_igmp > 255) {
		pr_err("%s: Invalid resend_igmp value %d not in range 0-255; rejected.\n",
		       bond->dev->name, resend_igmp);
		return -EINVAL;
	}

	bond->params.resend_igmp = resend_igmp;
	pr_info("%s: Setting resend_igmp to %d.\n",
		bond->dev->name, resend_igmp);

	return 0;
}
913 914 915 916 917 918

int bond_option_num_peer_notif_set(struct bonding *bond, int num_peer_notif)
{
	bond->params.num_peer_notif = num_peer_notif;
	return 0;
}
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int bond_option_all_slaves_active_set(struct bonding *bond,
				      int all_slaves_active)
{
	struct list_head *iter;
	struct slave *slave;

	if (all_slaves_active == bond->params.all_slaves_active)
		return 0;

	if ((all_slaves_active == 0) || (all_slaves_active == 1)) {
		bond->params.all_slaves_active = all_slaves_active;
	} else {
		pr_info("%s: Ignoring invalid all_slaves_active value %d.\n",
			bond->dev->name, all_slaves_active);
		return -EINVAL;
	}

	bond_for_each_slave(bond, slave, iter) {
		if (!bond_is_active_slave(slave)) {
			if (all_slaves_active)
				slave->inactive = 0;
			else
				slave->inactive = 1;
		}
	}

	return 0;
}
948 949 950 951 952 953 954 955 956

int bond_option_min_links_set(struct bonding *bond, int min_links)
{
	pr_info("%s: Setting min links value to %u\n",
		bond->dev->name, min_links);
	bond->params.min_links = min_links;

	return 0;
}
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int bond_option_lp_interval_set(struct bonding *bond, int lp_interval)
{
	if (lp_interval <= 0) {
		pr_err("%s: lp_interval must be between 1 and %d\n",
		       bond->dev->name, INT_MAX);
		return -EINVAL;
	}

	bond->params.lp_interval = lp_interval;

	return 0;
}
970

971
int bond_option_pps_set(struct bonding *bond, struct bond_opt_value *newval)
972
{
973 974
	bond->params.packets_per_slave = newval->value;
	if (newval->value > 0) {
975
		bond->params.reciprocal_packets_per_slave =
976
			reciprocal_value(newval->value);
977 978 979 980 981 982 983
	} else {
		/* reciprocal_packets_per_slave is unused if
		 * packets_per_slave is 0 or 1, just initialize it
		 */
		bond->params.reciprocal_packets_per_slave =
			(struct reciprocal_value) { 0 };
	}
984 985 986

	return 0;
}
987 988 989

int bond_option_lacp_rate_set(struct bonding *bond, int lacp_rate)
{
990 991 992 993 994 995
	if (bond_parm_tbl_lookup(lacp_rate, bond_lacp_tbl) < 0) {
		pr_err("%s: Ignoring invalid LACP rate value %d.\n",
		       bond->dev->name, lacp_rate);
		return -EINVAL;
	}

996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007
	if (bond->dev->flags & IFF_UP) {
		pr_err("%s: Unable to update LACP rate because interface is up.\n",
		       bond->dev->name);
		return -EPERM;
	}

	if (bond->params.mode != BOND_MODE_8023AD) {
		pr_err("%s: Unable to update LACP rate because bond is not in 802.3ad mode.\n",
		       bond->dev->name);
		return -EPERM;
	}

1008 1009 1010 1011 1012
	bond->params.lacp_fast = lacp_rate;
	bond_3ad_update_lacp_rate(bond);
	pr_info("%s: Setting LACP rate to %s (%d).\n",
		bond->dev->name, bond_lacp_tbl[lacp_rate].modename,
		lacp_rate);
1013 1014 1015

	return 0;
}
1016 1017 1018 1019 1020 1021 1022 1023 1024

int bond_option_ad_select_set(struct bonding *bond, int ad_select)
{
	if (bond_parm_tbl_lookup(ad_select, ad_select_tbl) < 0) {
		pr_err("%s: Ignoring invalid ad_select value %d.\n",
		       bond->dev->name, ad_select);
		return -EINVAL;
	}

1025 1026 1027 1028 1029 1030
	if (bond->dev->flags & IFF_UP) {
		pr_err("%s: Unable to update ad_select because interface is up.\n",
		       bond->dev->name);
		return -EPERM;
	}

1031 1032 1033 1034 1035 1036 1037
	bond->params.ad_select = ad_select;
	pr_info("%s: Setting ad_select to %s (%d).\n",
		bond->dev->name, ad_select_tbl[ad_select].modename,
		ad_select);

	return 0;
}