[linux-block.git] / net / ethtool / linkmodes.c

// SPDX-License-Identifier: GPL-2.0-only

#include "netlink.h"
#include "common.h"
#include "bitset.h"

/* LINKMODES_GET */

struct linkmodes_req_info {
	struct ethnl_req_info		base;
};

struct linkmodes_reply_data {
	struct ethnl_reply_data		base;
	struct ethtool_link_ksettings	ksettings;
	struct ethtool_link_settings	*lsettings;
	bool				peer_empty;
};

#define LINKMODES_REPDATA(__reply_base) \
	container_of(__reply_base, struct linkmodes_reply_data, base)

const struct nla_policy ethnl_linkmodes_get_policy[] = {
	[ETHTOOL_A_LINKMODES_HEADER]		=
		NLA_POLICY_NESTED(ethnl_header_policy),
};

static int linkmodes_prepare_data(const struct ethnl_req_info *req_base,
				  struct ethnl_reply_data *reply_base,
				  struct genl_info *info)
{
	struct linkmodes_reply_data *data = LINKMODES_REPDATA(reply_base);
	struct net_device *dev = reply_base->dev;
	int ret;

	data->lsettings = &data->ksettings.base;

	ret = ethnl_ops_begin(dev);
	if (ret < 0)
		return ret;

	ret = __ethtool_get_link_ksettings(dev, &data->ksettings);
	if (ret < 0 && info) {
		GENL_SET_ERR_MSG(info, "failed to retrieve link settings");
		goto out;
	}

	if (!dev->ethtool_ops->cap_link_lanes_supported)
		data->ksettings.lanes = 0;

	data->peer_empty =
		bitmap_empty(data->ksettings.link_modes.lp_advertising,
			     __ETHTOOL_LINK_MODE_MASK_NBITS);

out:
	ethnl_ops_complete(dev);
	return ret;
}

static int linkmodes_reply_size(const struct ethnl_req_info *req_base,
				const struct ethnl_reply_data *reply_base)
{
	const struct linkmodes_reply_data *data = LINKMODES_REPDATA(reply_base);
	const struct ethtool_link_ksettings *ksettings = &data->ksettings;
	const struct ethtool_link_settings *lsettings = &ksettings->base;
	bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
	int len, ret;

	len = nla_total_size(sizeof(u8)) /* LINKMODES_AUTONEG */
		+ nla_total_size(sizeof(u32)) /* LINKMODES_SPEED */
		+ nla_total_size(sizeof(u32)) /* LINKMODES_LANES */
		+ nla_total_size(sizeof(u8)) /* LINKMODES_DUPLEX */
		+ 0;
	ret = ethnl_bitset_size(ksettings->link_modes.advertising,
				ksettings->link_modes.supported,
				__ETHTOOL_LINK_MODE_MASK_NBITS,
				link_mode_names, compact);
	if (ret < 0)
		return ret;
	len += ret;
	if (!data->peer_empty) {
		ret = ethnl_bitset_size(ksettings->link_modes.lp_advertising,
					NULL, __ETHTOOL_LINK_MODE_MASK_NBITS,
					link_mode_names, compact);
		if (ret < 0)
			return ret;
		len += ret;
	}

	if (lsettings->master_slave_cfg != MASTER_SLAVE_CFG_UNSUPPORTED)
		len += nla_total_size(sizeof(u8));

	if (lsettings->master_slave_state != MASTER_SLAVE_STATE_UNSUPPORTED)
		len += nla_total_size(sizeof(u8));

	return len;
}

static int linkmodes_fill_reply(struct sk_buff *skb,
				const struct ethnl_req_info *req_base,
				const struct ethnl_reply_data *reply_base)
{
	const struct linkmodes_reply_data *data = LINKMODES_REPDATA(reply_base);
	const struct ethtool_link_ksettings *ksettings = &data->ksettings;
	const struct ethtool_link_settings *lsettings = &ksettings->base;
	bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
	int ret;

	if (nla_put_u8(skb, ETHTOOL_A_LINKMODES_AUTONEG, lsettings->autoneg))
		return -EMSGSIZE;

	ret = ethnl_put_bitset(skb, ETHTOOL_A_LINKMODES_OURS,
			       ksettings->link_modes.advertising,
			       ksettings->link_modes.supported,
			       __ETHTOOL_LINK_MODE_MASK_NBITS, link_mode_names,
			       compact);
	if (ret < 0)
		return -EMSGSIZE;
	if (!data->peer_empty) {
		ret = ethnl_put_bitset(skb, ETHTOOL_A_LINKMODES_PEER,
				       ksettings->link_modes.lp_advertising,
				       NULL, __ETHTOOL_LINK_MODE_MASK_NBITS,
				       link_mode_names, compact);
		if (ret < 0)
			return -EMSGSIZE;
	}

	if (nla_put_u32(skb, ETHTOOL_A_LINKMODES_SPEED, lsettings->speed) ||
	    nla_put_u8(skb, ETHTOOL_A_LINKMODES_DUPLEX, lsettings->duplex))
		return -EMSGSIZE;

	if (ksettings->lanes &&
	    nla_put_u32(skb, ETHTOOL_A_LINKMODES_LANES, ksettings->lanes))
		return -EMSGSIZE;

	if (lsettings->master_slave_cfg != MASTER_SLAVE_CFG_UNSUPPORTED &&
	    nla_put_u8(skb, ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG,
		       lsettings->master_slave_cfg))
		return -EMSGSIZE;

	if (lsettings->master_slave_state != MASTER_SLAVE_STATE_UNSUPPORTED &&
	    nla_put_u8(skb, ETHTOOL_A_LINKMODES_MASTER_SLAVE_STATE,
		       lsettings->master_slave_state))
		return -EMSGSIZE;

	return 0;
}

const struct ethnl_request_ops ethnl_linkmodes_request_ops = {
	.request_cmd		= ETHTOOL_MSG_LINKMODES_GET,
	.reply_cmd		= ETHTOOL_MSG_LINKMODES_GET_REPLY,
	.hdr_attr		= ETHTOOL_A_LINKMODES_HEADER,
	.req_info_size		= sizeof(struct linkmodes_req_info),
	.reply_data_size	= sizeof(struct linkmodes_reply_data),

	.prepare_data		= linkmodes_prepare_data,
	.reply_size		= linkmodes_reply_size,
	.fill_reply		= linkmodes_fill_reply,
};

/* LINKMODES_SET */

const struct nla_policy ethnl_linkmodes_set_policy[] = {
	[ETHTOOL_A_LINKMODES_HEADER]		=
		NLA_POLICY_NESTED(ethnl_header_policy),
	[ETHTOOL_A_LINKMODES_AUTONEG]		= { .type = NLA_U8 },
	[ETHTOOL_A_LINKMODES_OURS]		= { .type = NLA_NESTED },
	[ETHTOOL_A_LINKMODES_SPEED]		= { .type = NLA_U32 },
	[ETHTOOL_A_LINKMODES_DUPLEX]		= { .type = NLA_U8 },
	[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG]	= { .type = NLA_U8 },
	[ETHTOOL_A_LINKMODES_LANES]		= NLA_POLICY_RANGE(NLA_U32, 1, 8),
};

/* Set advertised link modes to all supported modes matching requested speed,
 * lanes and duplex values. Called when autonegotiation is on, speed, lanes or
 * duplex is requested but no link mode change. This is done in userspace with
 * ioctl() interface, move it into kernel for netlink.
 * Returns true if advertised modes bitmap was modified.
 */
static bool ethnl_auto_linkmodes(struct ethtool_link_ksettings *ksettings,
				 bool req_speed, bool req_lanes, bool req_duplex)
{
	unsigned long *advertising = ksettings->link_modes.advertising;
	unsigned long *supported = ksettings->link_modes.supported;
	DECLARE_BITMAP(old_adv, __ETHTOOL_LINK_MODE_MASK_NBITS);
	unsigned int i;

	bitmap_copy(old_adv, advertising, __ETHTOOL_LINK_MODE_MASK_NBITS);

	for (i = 0; i < __ETHTOOL_LINK_MODE_MASK_NBITS; i++) {
		const struct link_mode_info *info = &link_mode_params[i];

		if (info->speed == SPEED_UNKNOWN)
			continue;
		if (test_bit(i, supported) &&
		    (!req_speed || info->speed == ksettings->base.speed) &&
		    (!req_lanes || info->lanes == ksettings->lanes) &&
		    (!req_duplex || info->duplex == ksettings->base.duplex))
			set_bit(i, advertising);
		else
			clear_bit(i, advertising);
	}

	return !bitmap_equal(old_adv, advertising,
			     __ETHTOOL_LINK_MODE_MASK_NBITS);
}

static bool ethnl_validate_master_slave_cfg(u8 cfg)
{
	switch (cfg) {
	case MASTER_SLAVE_CFG_MASTER_PREFERRED:
	case MASTER_SLAVE_CFG_SLAVE_PREFERRED:
	case MASTER_SLAVE_CFG_MASTER_FORCE:
	case MASTER_SLAVE_CFG_SLAVE_FORCE:
		return true;
	}

	return false;
}

static int ethnl_check_linkmodes(struct genl_info *info, struct nlattr **tb)
{
	const struct nlattr *master_slave_cfg, *lanes_cfg;

	master_slave_cfg = tb[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG];
	if (master_slave_cfg &&
	    !ethnl_validate_master_slave_cfg(nla_get_u8(master_slave_cfg))) {
		NL_SET_ERR_MSG_ATTR(info->extack, master_slave_cfg,
				    "master/slave value is invalid");
		return -EOPNOTSUPP;
	}

	lanes_cfg = tb[ETHTOOL_A_LINKMODES_LANES];
	if (lanes_cfg && !is_power_of_2(nla_get_u32(lanes_cfg))) {
		NL_SET_ERR_MSG_ATTR(info->extack, lanes_cfg,
				    "lanes value is invalid");
		return -EINVAL;
	}

	return 0;
}

static int ethnl_update_linkmodes(struct genl_info *info, struct nlattr **tb,
				  struct ethtool_link_ksettings *ksettings,
				  bool *mod, const struct net_device *dev)
{
	struct ethtool_link_settings *lsettings = &ksettings->base;
	bool req_speed, req_lanes, req_duplex;
	const struct nlattr *master_slave_cfg, *lanes_cfg;
	int ret;

	master_slave_cfg = tb[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG];
	if (master_slave_cfg) {
		if (lsettings->master_slave_cfg == MASTER_SLAVE_CFG_UNSUPPORTED) {
			NL_SET_ERR_MSG_ATTR(info->extack, master_slave_cfg,
					    "master/slave configuration not supported by device");
			return -EOPNOTSUPP;
		}
	}

	*mod = false;
	req_speed = tb[ETHTOOL_A_LINKMODES_SPEED];
	req_lanes = tb[ETHTOOL_A_LINKMODES_LANES];
	req_duplex = tb[ETHTOOL_A_LINKMODES_DUPLEX];

	ethnl_update_u8(&lsettings->autoneg, tb[ETHTOOL_A_LINKMODES_AUTONEG],
			mod);

	lanes_cfg = tb[ETHTOOL_A_LINKMODES_LANES];
	if (lanes_cfg) {
		/* If autoneg is off and lanes parameter is not supported by the
		 * driver, return an error.
		 */
		if (!lsettings->autoneg &&
		    !dev->ethtool_ops->cap_link_lanes_supported) {
			NL_SET_ERR_MSG_ATTR(info->extack, lanes_cfg,
					    "lanes configuration not supported by device");
			return -EOPNOTSUPP;
		}
	} else if (!lsettings->autoneg) {
		/* If autoneg is off and lanes parameter is not passed from user,
		 * set the lanes parameter to 0.
		 */
		ksettings->lanes = 0;
	}

	ret = ethnl_update_bitset(ksettings->link_modes.advertising,
				  __ETHTOOL_LINK_MODE_MASK_NBITS,
				  tb[ETHTOOL_A_LINKMODES_OURS], link_mode_names,
				  info->extack, mod);
	if (ret < 0)
		return ret;
	ethnl_update_u32(&lsettings->speed, tb[ETHTOOL_A_LINKMODES_SPEED],
			 mod);
	ethnl_update_u32(&ksettings->lanes, lanes_cfg, mod);
	ethnl_update_u8(&lsettings->duplex, tb[ETHTOOL_A_LINKMODES_DUPLEX],
			mod);
	ethnl_update_u8(&lsettings->master_slave_cfg, master_slave_cfg, mod);

	if (!tb[ETHTOOL_A_LINKMODES_OURS] && lsettings->autoneg &&
	    (req_speed || req_lanes || req_duplex) &&
	    ethnl_auto_linkmodes(ksettings, req_speed, req_lanes, req_duplex))
		*mod = true;

	return 0;
}

int ethnl_set_linkmodes(struct sk_buff *skb, struct genl_info *info)
{
	struct ethtool_link_ksettings ksettings = {};
	struct ethnl_req_info req_info = {};
	struct nlattr **tb = info->attrs;
	struct net_device *dev;
	bool mod = false;
	int ret;

	ret = ethnl_check_linkmodes(info, tb);
	if (ret < 0)
		return ret;

	ret = ethnl_parse_header_dev_get(&req_info,
					 tb[ETHTOOL_A_LINKMODES_HEADER],
					 genl_info_net(info), info->extack,
					 true);
	if (ret < 0)
		return ret;
	dev = req_info.dev;
	ret = -EOPNOTSUPP;
	if (!dev->ethtool_ops->get_link_ksettings ||
	    !dev->ethtool_ops->set_link_ksettings)
		goto out_dev;

	rtnl_lock();
	ret = ethnl_ops_begin(dev);
	if (ret < 0)
		goto out_rtnl;

	ret = __ethtool_get_link_ksettings(dev, &ksettings);
	if (ret < 0) {
		GENL_SET_ERR_MSG(info, "failed to retrieve link settings");
		goto out_ops;
	}

	ret = ethnl_update_linkmodes(info, tb, &ksettings, &mod, dev);
	if (ret < 0)
		goto out_ops;

	if (mod) {
		ret = dev->ethtool_ops->set_link_ksettings(dev, &ksettings);
		if (ret < 0)
			GENL_SET_ERR_MSG(info, "link settings update failed");
		else
			ethtool_notify(dev, ETHTOOL_MSG_LINKMODES_NTF, NULL);
	}

out_ops:
	ethnl_ops_complete(dev);
out_rtnl:
	rtnl_unlock();
out_dev:
	dev_put(dev);
	return ret;
}
Commit	Line	Data
f625aa9b MK	1	// SPDX-License-Identifier: GPL-2.0-only
	2
	3	#include "netlink.h"
	4	#include "common.h"
	5	#include "bitset.h"
	6
c8907043 DR	7	/* LINKMODES_GET */
c8907043 DR	8
f625aa9b MK	9	struct linkmodes_req_info {
	10	struct ethnl_req_info base;
	11	};
	12
	13	struct linkmodes_reply_data {
	14	struct ethnl_reply_data base;
	15	struct ethtool_link_ksettings ksettings;
	16	struct ethtool_link_settings *lsettings;
	17	bool peer_empty;
	18	};
	19
	20	#define LINKMODES_REPDATA(__reply_base) \
	21	container_of(__reply_base, struct linkmodes_reply_data, base)
	22
ff419afa	23	const struct nla_policy ethnl_linkmodes_get_policy[] = {
329d9c33 JK	24	[ETHTOOL_A_LINKMODES_HEADER] =
329d9c33 JK	25	NLA_POLICY_NESTED(ethnl_header_policy),
f625aa9b MK	26	};
	27
	28	static int linkmodes_prepare_data(const struct ethnl_req_info *req_base,
	29	struct ethnl_reply_data *reply_base,
	30	struct genl_info *info)
	31	{
	32	struct linkmodes_reply_data *data = LINKMODES_REPDATA(reply_base);
	33	struct net_device *dev = reply_base->dev;
	34	int ret;
	35
	36	data->lsettings = &data->ksettings.base;
	37
	38	ret = ethnl_ops_begin(dev);
	39	if (ret < 0)
	40	return ret;
	41
	42	ret = __ethtool_get_link_ksettings(dev, &data->ksettings);
	43	if (ret < 0 && info) {
	44	GENL_SET_ERR_MSG(info, "failed to retrieve link settings");
	45	goto out;
	46	}
	47
7dc33f09 DR	48	if (!dev->ethtool_ops->cap_link_lanes_supported)
	49	data->ksettings.lanes = 0;
	50
f625aa9b MK	51	data->peer_empty =
	52	bitmap_empty(data->ksettings.link_modes.lp_advertising,
	53	__ETHTOOL_LINK_MODE_MASK_NBITS);
	54
	55	out:
	56	ethnl_ops_complete(dev);
	57	return ret;
	58	}
	59
	60	static int linkmodes_reply_size(const struct ethnl_req_info *req_base,
	61	const struct ethnl_reply_data *reply_base)
	62	{
	63	const struct linkmodes_reply_data *data = LINKMODES_REPDATA(reply_base);
	64	const struct ethtool_link_ksettings *ksettings = &data->ksettings;
bdbdac76	65	const struct ethtool_link_settings *lsettings = &ksettings->base;
f625aa9b MK	66	bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
	67	int len, ret;
	68
	69	len = nla_total_size(sizeof(u8)) /* LINKMODES_AUTONEG */
	70	+ nla_total_size(sizeof(u32)) /* LINKMODES_SPEED */
7dc33f09	71	+ nla_total_size(sizeof(u32)) /* LINKMODES_LANES */
f625aa9b MK	72	+ nla_total_size(sizeof(u8)) /* LINKMODES_DUPLEX */
	73	+ 0;
	74	ret = ethnl_bitset_size(ksettings->link_modes.advertising,
	75	ksettings->link_modes.supported,
	76	__ETHTOOL_LINK_MODE_MASK_NBITS,
	77	link_mode_names, compact);
	78	if (ret < 0)
	79	return ret;
	80	len += ret;
	81	if (!data->peer_empty) {
	82	ret = ethnl_bitset_size(ksettings->link_modes.lp_advertising,
	83	NULL, __ETHTOOL_LINK_MODE_MASK_NBITS,
	84	link_mode_names, compact);
	85	if (ret < 0)
	86	return ret;
	87	len += ret;
	88	}
	89
bdbdac76 OR	90	if (lsettings->master_slave_cfg != MASTER_SLAVE_CFG_UNSUPPORTED)
	91	len += nla_total_size(sizeof(u8));
	92
	93	if (lsettings->master_slave_state != MASTER_SLAVE_STATE_UNSUPPORTED)
	94	len += nla_total_size(sizeof(u8));
	95
f625aa9b MK	96	return len;
	97	}
	98
	99	static int linkmodes_fill_reply(struct sk_buff *skb,
	100	const struct ethnl_req_info *req_base,
	101	const struct ethnl_reply_data *reply_base)
	102	{
	103	const struct linkmodes_reply_data *data = LINKMODES_REPDATA(reply_base);
	104	const struct ethtool_link_ksettings *ksettings = &data->ksettings;
	105	const struct ethtool_link_settings *lsettings = &ksettings->base;
	106	bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
	107	int ret;
	108
	109	if (nla_put_u8(skb, ETHTOOL_A_LINKMODES_AUTONEG, lsettings->autoneg))
	110	return -EMSGSIZE;
	111
	112	ret = ethnl_put_bitset(skb, ETHTOOL_A_LINKMODES_OURS,
	113	ksettings->link_modes.advertising,
	114	ksettings->link_modes.supported,
	115	__ETHTOOL_LINK_MODE_MASK_NBITS, link_mode_names,
	116	compact);
	117	if (ret < 0)
	118	return -EMSGSIZE;
	119	if (!data->peer_empty) {
	120	ret = ethnl_put_bitset(skb, ETHTOOL_A_LINKMODES_PEER,
	121	ksettings->link_modes.lp_advertising,
	122	NULL, __ETHTOOL_LINK_MODE_MASK_NBITS,
	123	link_mode_names, compact);
	124	if (ret < 0)
	125	return -EMSGSIZE;
	126	}
	127
	128	if (nla_put_u32(skb, ETHTOOL_A_LINKMODES_SPEED, lsettings->speed) \|\|
	129	nla_put_u8(skb, ETHTOOL_A_LINKMODES_DUPLEX, lsettings->duplex))
	130	return -EMSGSIZE;
	131
7dc33f09 DR	132	if (ksettings->lanes &&
	133	nla_put_u32(skb, ETHTOOL_A_LINKMODES_LANES, ksettings->lanes))
	134	return -EMSGSIZE;
	135
bdbdac76 OR	136	if (lsettings->master_slave_cfg != MASTER_SLAVE_CFG_UNSUPPORTED &&
	137	nla_put_u8(skb, ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG,
	138	lsettings->master_slave_cfg))
	139	return -EMSGSIZE;
	140
	141	if (lsettings->master_slave_state != MASTER_SLAVE_STATE_UNSUPPORTED &&
	142	nla_put_u8(skb, ETHTOOL_A_LINKMODES_MASTER_SLAVE_STATE,
	143	lsettings->master_slave_state))
	144	return -EMSGSIZE;
	145
f625aa9b MK	146	return 0;
	147	}
	148
	149	const struct ethnl_request_ops ethnl_linkmodes_request_ops = {
	150	.request_cmd = ETHTOOL_MSG_LINKMODES_GET,
	151	.reply_cmd = ETHTOOL_MSG_LINKMODES_GET_REPLY,
	152	.hdr_attr = ETHTOOL_A_LINKMODES_HEADER,
f625aa9b MK	153	.req_info_size = sizeof(struct linkmodes_req_info),
f625aa9b MK	154	.reply_data_size = sizeof(struct linkmodes_reply_data),
f625aa9b MK	155
	156	.prepare_data = linkmodes_prepare_data,
	157	.reply_size = linkmodes_reply_size,
	158	.fill_reply = linkmodes_fill_reply,
	159	};
bfbcfe20 MK	160
	161	/* LINKMODES_SET */
	162
ff419afa	163	const struct nla_policy ethnl_linkmodes_set_policy[] = {
329d9c33 JK	164	[ETHTOOL_A_LINKMODES_HEADER] =
329d9c33 JK	165	NLA_POLICY_NESTED(ethnl_header_policy),
bfbcfe20 MK	166	[ETHTOOL_A_LINKMODES_AUTONEG] = { .type = NLA_U8 },
bfbcfe20 MK	167	[ETHTOOL_A_LINKMODES_OURS] = { .type = NLA_NESTED },
bfbcfe20 MK	168	[ETHTOOL_A_LINKMODES_SPEED] = { .type = NLA_U32 },
bfbcfe20 MK	169	[ETHTOOL_A_LINKMODES_DUPLEX] = { .type = NLA_U8 },
bdbdac76	170	[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG] = { .type = NLA_U8 },
012ce4dd	171	[ETHTOOL_A_LINKMODES_LANES] = NLA_POLICY_RANGE(NLA_U32, 1, 8),
bfbcfe20 MK	172	};
bfbcfe20 MK	173
012ce4dd DR	174	/* Set advertised link modes to all supported modes matching requested speed,
	175	* lanes and duplex values. Called when autonegotiation is on, speed, lanes or
	176	* duplex is requested but no link mode change. This is done in userspace with
	177	* ioctl() interface, move it into kernel for netlink.
bfbcfe20 MK	178	* Returns true if advertised modes bitmap was modified.
	179	*/
	180	static bool ethnl_auto_linkmodes(struct ethtool_link_ksettings *ksettings,
012ce4dd	181	bool req_speed, bool req_lanes, bool req_duplex)
bfbcfe20 MK	182	{
	183	unsigned long *advertising = ksettings->link_modes.advertising;
	184	unsigned long *supported = ksettings->link_modes.supported;
	185	DECLARE_BITMAP(old_adv, __ETHTOOL_LINK_MODE_MASK_NBITS);
	186	unsigned int i;
	187
bfbcfe20 MK	188	bitmap_copy(old_adv, advertising, __ETHTOOL_LINK_MODE_MASK_NBITS);
	189
	190	for (i = 0; i < __ETHTOOL_LINK_MODE_MASK_NBITS; i++) {
	191	const struct link_mode_info *info = &link_mode_params[i];
	192
	193	if (info->speed == SPEED_UNKNOWN)
	194	continue;
	195	if (test_bit(i, supported) &&
	196	(!req_speed \|\| info->speed == ksettings->base.speed) &&
012ce4dd	197	(!req_lanes \|\| info->lanes == ksettings->lanes) &&
bfbcfe20 MK	198	(!req_duplex \|\| info->duplex == ksettings->base.duplex))
	199	set_bit(i, advertising);
	200	else
	201	clear_bit(i, advertising);
	202	}
	203
	204	return !bitmap_equal(old_adv, advertising,
	205	__ETHTOOL_LINK_MODE_MASK_NBITS);
	206	}
	207
bdbdac76 OR	208	static bool ethnl_validate_master_slave_cfg(u8 cfg)
	209	{
	210	switch (cfg) {
	211	case MASTER_SLAVE_CFG_MASTER_PREFERRED:
	212	case MASTER_SLAVE_CFG_SLAVE_PREFERRED:
	213	case MASTER_SLAVE_CFG_MASTER_FORCE:
	214	case MASTER_SLAVE_CFG_SLAVE_FORCE:
	215	return true;
	216	}
	217
	218	return false;
	219	}
	220
189e7a8d DR	221	static int ethnl_check_linkmodes(struct genl_info info, struct nlattr *tb)
189e7a8d DR	222	{
012ce4dd	223	const struct nlattr master_slave_cfg, lanes_cfg;
189e7a8d DR	224
	225	master_slave_cfg = tb[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG];
	226	if (master_slave_cfg &&
	227	!ethnl_validate_master_slave_cfg(nla_get_u8(master_slave_cfg))) {
	228	NL_SET_ERR_MSG_ATTR(info->extack, master_slave_cfg,
	229	"master/slave value is invalid");
	230	return -EOPNOTSUPP;
	231	}
	232
012ce4dd DR	233	lanes_cfg = tb[ETHTOOL_A_LINKMODES_LANES];
	234	if (lanes_cfg && !is_power_of_2(nla_get_u32(lanes_cfg))) {
	235	NL_SET_ERR_MSG_ATTR(info->extack, lanes_cfg,
	236	"lanes value is invalid");
	237	return -EINVAL;
	238	}
	239
189e7a8d DR	240	return 0;
	241	}
	242
bfbcfe20 MK	243	static int ethnl_update_linkmodes(struct genl_info info, struct nlattr *tb,
bfbcfe20 MK	244	struct ethtool_link_ksettings *ksettings,
012ce4dd	245	bool mod, const struct net_device dev)
bfbcfe20 MK	246	{
bfbcfe20 MK	247	struct ethtool_link_settings *lsettings = &ksettings->base;
012ce4dd DR	248	bool req_speed, req_lanes, req_duplex;
012ce4dd DR	249	const struct nlattr master_slave_cfg, lanes_cfg;
bfbcfe20 MK	250	int ret;
bfbcfe20 MK	251
bdbdac76 OR	252	master_slave_cfg = tb[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG];
bdbdac76 OR	253	if (master_slave_cfg) {
bdbdac76 OR	254	if (lsettings->master_slave_cfg == MASTER_SLAVE_CFG_UNSUPPORTED) {
	255	NL_SET_ERR_MSG_ATTR(info->extack, master_slave_cfg,
	256	"master/slave configuration not supported by device");
	257	return -EOPNOTSUPP;
	258	}
bdbdac76 OR	259	}
bdbdac76 OR	260
bfbcfe20 MK	261	*mod = false;
bfbcfe20 MK	262	req_speed = tb[ETHTOOL_A_LINKMODES_SPEED];
012ce4dd	263	req_lanes = tb[ETHTOOL_A_LINKMODES_LANES];
bfbcfe20 MK	264	req_duplex = tb[ETHTOOL_A_LINKMODES_DUPLEX];
	265
	266	ethnl_update_u8(&lsettings->autoneg, tb[ETHTOOL_A_LINKMODES_AUTONEG],
	267	mod);
012ce4dd DR	268
	269	lanes_cfg = tb[ETHTOOL_A_LINKMODES_LANES];
	270	if (lanes_cfg) {
	271	/* If autoneg is off and lanes parameter is not supported by the
	272	* driver, return an error.
	273	*/
	274	if (!lsettings->autoneg &&
	275	!dev->ethtool_ops->cap_link_lanes_supported) {
	276	NL_SET_ERR_MSG_ATTR(info->extack, lanes_cfg,
	277	"lanes configuration not supported by device");
	278	return -EOPNOTSUPP;
	279	}
	280	} else if (!lsettings->autoneg) {
	281	/* If autoneg is off and lanes parameter is not passed from user,
	282	* set the lanes parameter to 0.
	283	*/
	284	ksettings->lanes = 0;
	285	}
	286
bfbcfe20 MK	287	ret = ethnl_update_bitset(ksettings->link_modes.advertising,
	288	__ETHTOOL_LINK_MODE_MASK_NBITS,
	289	tb[ETHTOOL_A_LINKMODES_OURS], link_mode_names,
	290	info->extack, mod);
	291	if (ret < 0)
	292	return ret;
	293	ethnl_update_u32(&lsettings->speed, tb[ETHTOOL_A_LINKMODES_SPEED],
	294	mod);
012ce4dd	295	ethnl_update_u32(&ksettings->lanes, lanes_cfg, mod);
bfbcfe20 MK	296	ethnl_update_u8(&lsettings->duplex, tb[ETHTOOL_A_LINKMODES_DUPLEX],
bfbcfe20 MK	297	mod);
bdbdac76	298	ethnl_update_u8(&lsettings->master_slave_cfg, master_slave_cfg, mod);
bfbcfe20 MK	299
bfbcfe20 MK	300	if (!tb[ETHTOOL_A_LINKMODES_OURS] && lsettings->autoneg &&
012ce4dd DR	301	(req_speed \|\| req_lanes \|\| req_duplex) &&
012ce4dd DR	302	ethnl_auto_linkmodes(ksettings, req_speed, req_lanes, req_duplex))
bfbcfe20 MK	303	*mod = true;
	304
	305	return 0;
	306	}
	307
	308	int ethnl_set_linkmodes(struct sk_buff skb, struct genl_info info)
	309	{
bfbcfe20	310	struct ethtool_link_ksettings ksettings = {};
bfbcfe20	311	struct ethnl_req_info req_info = {};
5028588b	312	struct nlattr **tb = info->attrs;
bfbcfe20 MK	313	struct net_device *dev;
	314	bool mod = false;
	315	int ret;
	316
189e7a8d DR	317	ret = ethnl_check_linkmodes(info, tb);
	318	if (ret < 0)
	319	return ret;
	320
98130546 MK	321	ret = ethnl_parse_header_dev_get(&req_info,
	322	tb[ETHTOOL_A_LINKMODES_HEADER],
	323	genl_info_net(info), info->extack,
	324	true);
bfbcfe20 MK	325	if (ret < 0)
	326	return ret;
	327	dev = req_info.dev;
2f599ec4	328	ret = -EOPNOTSUPP;
bfbcfe20 MK	329	if (!dev->ethtool_ops->get_link_ksettings \|\|
bfbcfe20 MK	330	!dev->ethtool_ops->set_link_ksettings)
2f599ec4	331	goto out_dev;
bfbcfe20 MK	332
	333	rtnl_lock();
	334	ret = ethnl_ops_begin(dev);
	335	if (ret < 0)
	336	goto out_rtnl;
	337
	338	ret = __ethtool_get_link_ksettings(dev, &ksettings);
	339	if (ret < 0) {
71fed0bc	340	GENL_SET_ERR_MSG(info, "failed to retrieve link settings");
bfbcfe20 MK	341	goto out_ops;
bfbcfe20 MK	342	}
bfbcfe20	343
012ce4dd	344	ret = ethnl_update_linkmodes(info, tb, &ksettings, &mod, dev);
bfbcfe20 MK	345	if (ret < 0)
	346	goto out_ops;
	347
	348	if (mod) {
	349	ret = dev->ethtool_ops->set_link_ksettings(dev, &ksettings);
	350	if (ret < 0)
	351	GENL_SET_ERR_MSG(info, "link settings update failed");
1b1b1847 MK	352	else
1b1b1847 MK	353	ethtool_notify(dev, ETHTOOL_MSG_LINKMODES_NTF, NULL);
bfbcfe20 MK	354	}
	355
	356	out_ops:
	357	ethnl_ops_complete(dev);
	358	out_rtnl:
	359	rtnl_unlock();
2f599ec4	360	out_dev:
bfbcfe20 MK	361	dev_put(dev);
	362	return ret;
	363	}