net/ethtool/features.c - linux - Git at Google

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

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

 struct features_req_info {
 	struct ethnl_req_info	base;
 };

 struct features_reply_data {
 	struct ethnl_reply_data	base;
 	u32			hw[ETHTOOL_DEV_FEATURE_WORDS];
 	u32			wanted[ETHTOOL_DEV_FEATURE_WORDS];
 	u32			active[ETHTOOL_DEV_FEATURE_WORDS];
 	u32			nochange[ETHTOOL_DEV_FEATURE_WORDS];
 	u32			all[ETHTOOL_DEV_FEATURE_WORDS];
 };

 #define FEATURES_REPDATA(__reply_base) \
 	container_of(__reply_base, struct features_reply_data, base)

 static const struct nla_policy
 features_get_policy[ETHTOOL_A_FEATURES_MAX + 1] = {
 	[ETHTOOL_A_FEATURES_UNSPEC]	= { .type = NLA_REJECT },
 	[ETHTOOL_A_FEATURES_HEADER]	= { .type = NLA_NESTED },
 	[ETHTOOL_A_FEATURES_HW]		= { .type = NLA_REJECT },
 	[ETHTOOL_A_FEATURES_WANTED]	= { .type = NLA_REJECT },
 	[ETHTOOL_A_FEATURES_ACTIVE]	= { .type = NLA_REJECT },
 	[ETHTOOL_A_FEATURES_NOCHANGE]	= { .type = NLA_REJECT },
 };

 static void ethnl_features_to_bitmap32(u32 *dest, netdev_features_t src)
 {
 	unsigned int i;

 	for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; i++)
 		dest[i] = src >> (32 * i);
 }

 static int features_prepare_data(const struct ethnl_req_info *req_base,
 				 struct ethnl_reply_data *reply_base,
 				 struct genl_info *info)
 {
 	struct features_reply_data *data = FEATURES_REPDATA(reply_base);
 	struct net_device *dev = reply_base->dev;
 	netdev_features_t all_features;

 	ethnl_features_to_bitmap32(data->hw, dev->hw_features);
 	ethnl_features_to_bitmap32(data->wanted, dev->wanted_features);
 	ethnl_features_to_bitmap32(data->active, dev->features);
 	ethnl_features_to_bitmap32(data->nochange, NETIF_F_NEVER_CHANGE);
 	all_features = GENMASK_ULL(NETDEV_FEATURE_COUNT - 1, 0);
 	ethnl_features_to_bitmap32(data->all, all_features);

 	return 0;
 }

 static int features_reply_size(const struct ethnl_req_info *req_base,
 			       const struct ethnl_reply_data *reply_base)
 {
 	const struct features_reply_data *data = FEATURES_REPDATA(reply_base);
 	bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
 	unsigned int len = 0;
 	int ret;

 	ret = ethnl_bitset32_size(data->hw, data->all, NETDEV_FEATURE_COUNT,
 				  netdev_features_strings, compact);
 	if (ret < 0)
 		return ret;
 	len += ret;
 	ret = ethnl_bitset32_size(data->wanted, NULL, NETDEV_FEATURE_COUNT,
 				  netdev_features_strings, compact);
 	if (ret < 0)
 		return ret;
 	len += ret;
 	ret = ethnl_bitset32_size(data->active, NULL, NETDEV_FEATURE_COUNT,
 				  netdev_features_strings, compact);
 	if (ret < 0)
 		return ret;
 	len += ret;
 	ret = ethnl_bitset32_size(data->nochange, NULL, NETDEV_FEATURE_COUNT,
 				  netdev_features_strings, compact);
 	if (ret < 0)
 		return ret;
 	len += ret;

 	return len;
 }

 static int features_fill_reply(struct sk_buff *skb,
 			       const struct ethnl_req_info *req_base,
 			       const struct ethnl_reply_data *reply_base)
 {
 	const struct features_reply_data *data = FEATURES_REPDATA(reply_base);
 	bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
 	int ret;

 	ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_HW, data->hw,
 				 data->all, NETDEV_FEATURE_COUNT,
 				 netdev_features_strings, compact);
 	if (ret < 0)
 		return ret;
 	ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_WANTED, data->wanted,
 				 NULL, NETDEV_FEATURE_COUNT,
 				 netdev_features_strings, compact);
 	if (ret < 0)
 		return ret;
 	ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_ACTIVE, data->active,
 				 NULL, NETDEV_FEATURE_COUNT,
 				 netdev_features_strings, compact);
 	if (ret < 0)
 		return ret;
 	return ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_NOCHANGE,
 				  data->nochange, NULL, NETDEV_FEATURE_COUNT,
 				  netdev_features_strings, compact);
 }

 const struct ethnl_request_ops ethnl_features_request_ops = {
 	.request_cmd		= ETHTOOL_MSG_FEATURES_GET,
 	.reply_cmd		= ETHTOOL_MSG_FEATURES_GET_REPLY,
 	.hdr_attr		= ETHTOOL_A_FEATURES_HEADER,
 	.max_attr		= ETHTOOL_A_FEATURES_MAX,
 	.req_info_size		= sizeof(struct features_req_info),
 	.reply_data_size	= sizeof(struct features_reply_data),
 	.request_policy		= features_get_policy,

 	.prepare_data		= features_prepare_data,
 	.reply_size		= features_reply_size,
 	.fill_reply		= features_fill_reply,
 };

 /* FEATURES_SET */

 static const struct nla_policy
 features_set_policy[ETHTOOL_A_FEATURES_MAX + 1] = {
 	[ETHTOOL_A_FEATURES_UNSPEC]	= { .type = NLA_REJECT },
 	[ETHTOOL_A_FEATURES_HEADER]	= { .type = NLA_NESTED },
 	[ETHTOOL_A_FEATURES_HW]		= { .type = NLA_REJECT },
 	[ETHTOOL_A_FEATURES_WANTED]	= { .type = NLA_NESTED },
 	[ETHTOOL_A_FEATURES_ACTIVE]	= { .type = NLA_REJECT },
 	[ETHTOOL_A_FEATURES_NOCHANGE]	= { .type = NLA_REJECT },
 };

 static void ethnl_features_to_bitmap(unsigned long *dest, netdev_features_t val)
 {
 	const unsigned int words = BITS_TO_LONGS(NETDEV_FEATURE_COUNT);
 	unsigned int i;

 	bitmap_zero(dest, NETDEV_FEATURE_COUNT);
 	for (i = 0; i < words; i++)
 		dest[i] = (unsigned long)(val >> (i * BITS_PER_LONG));
 }

 static netdev_features_t ethnl_bitmap_to_features(unsigned long *src)
 {
 	const unsigned int nft_bits = sizeof(netdev_features_t) * BITS_PER_BYTE;
 	const unsigned int words = BITS_TO_LONGS(NETDEV_FEATURE_COUNT);
 	netdev_features_t ret = 0;
 	unsigned int i;

 	for (i = 0; i < words; i++)
 		ret |= (netdev_features_t)(src[i]) << (i * BITS_PER_LONG);
 	ret &= ~(netdev_features_t)0 >> (nft_bits - NETDEV_FEATURE_COUNT);
 	return ret;
 }

 static int features_send_reply(struct net_device *dev, struct genl_info *info,
 			       const unsigned long *wanted,
 			       const unsigned long *wanted_mask,
 			       const unsigned long *active,
 			       const unsigned long *active_mask, bool compact)
 {
 	struct sk_buff *rskb;
 	void *reply_payload;
 	int reply_len = 0;
 	int ret;

 	reply_len = ethnl_reply_header_size();
 	ret = ethnl_bitset_size(wanted, wanted_mask, NETDEV_FEATURE_COUNT,
 				netdev_features_strings, compact);
 	if (ret < 0)
 		goto err;
 	reply_len += ret;
 	ret = ethnl_bitset_size(active, active_mask, NETDEV_FEATURE_COUNT,
 				netdev_features_strings, compact);
 	if (ret < 0)
 		goto err;
 	reply_len += ret;

 	ret = -ENOMEM;
 	rskb = ethnl_reply_init(reply_len, dev, ETHTOOL_MSG_FEATURES_SET_REPLY,
 				ETHTOOL_A_FEATURES_HEADER, info,
 				&reply_payload);
 	if (!rskb)
 		goto err;

 	ret = ethnl_put_bitset(rskb, ETHTOOL_A_FEATURES_WANTED, wanted,
 			       wanted_mask, NETDEV_FEATURE_COUNT,
 			       netdev_features_strings, compact);
 	if (ret < 0)
 		goto nla_put_failure;
 	ret = ethnl_put_bitset(rskb, ETHTOOL_A_FEATURES_ACTIVE, active,
 			       active_mask, NETDEV_FEATURE_COUNT,
 			       netdev_features_strings, compact);
 	if (ret < 0)
 		goto nla_put_failure;

 	genlmsg_end(rskb, reply_payload);
 	ret = genlmsg_reply(rskb, info);
 	return ret;

 nla_put_failure:
 	nlmsg_free(rskb);
 	WARN_ONCE(1, "calculated message payload length (%d) not sufficient\n",
 		  reply_len);
 err:
 	GENL_SET_ERR_MSG(info, "failed to send reply message");
 	return ret;
 }

 int ethnl_set_features(struct sk_buff *skb, struct genl_info *info)
 {
 	DECLARE_BITMAP(wanted_diff_mask, NETDEV_FEATURE_COUNT);
 	DECLARE_BITMAP(active_diff_mask, NETDEV_FEATURE_COUNT);
 	DECLARE_BITMAP(old_active, NETDEV_FEATURE_COUNT);
 	DECLARE_BITMAP(old_wanted, NETDEV_FEATURE_COUNT);
 	DECLARE_BITMAP(new_active, NETDEV_FEATURE_COUNT);
 	DECLARE_BITMAP(new_wanted, NETDEV_FEATURE_COUNT);
 	DECLARE_BITMAP(req_wanted, NETDEV_FEATURE_COUNT);
 	DECLARE_BITMAP(req_mask, NETDEV_FEATURE_COUNT);
 	struct nlattr *tb[ETHTOOL_A_FEATURES_MAX + 1];
 	struct ethnl_req_info req_info = {};
 	struct net_device *dev;
 	bool mod;
 	int ret;

 	ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb,
 			  ETHTOOL_A_FEATURES_MAX, features_set_policy,
 			  info->extack);
 	if (ret < 0)
 		return ret;
 	if (!tb[ETHTOOL_A_FEATURES_WANTED])
 		return -EINVAL;
 	ret = ethnl_parse_header_dev_get(&req_info,
 					 tb[ETHTOOL_A_FEATURES_HEADER],
 					 genl_info_net(info), info->extack,
 					 true);
 	if (ret < 0)
 		return ret;
 	dev = req_info.dev;

 	rtnl_lock();
 	ethnl_features_to_bitmap(old_active, dev->features);
 	ethnl_features_to_bitmap(old_wanted, dev->wanted_features);
 	ret = ethnl_parse_bitset(req_wanted, req_mask, NETDEV_FEATURE_COUNT,
 				 tb[ETHTOOL_A_FEATURES_WANTED],
 				 netdev_features_strings, info->extack);
 	if (ret < 0)
 		goto out_rtnl;
 	if (ethnl_bitmap_to_features(req_mask) & ~NETIF_F_ETHTOOL_BITS) {
 		GENL_SET_ERR_MSG(info, "attempt to change non-ethtool features");
 		ret = -EINVAL;
 		goto out_rtnl;
 	}

 	/* set req_wanted bits not in req_mask from old_wanted */
 	bitmap_and(req_wanted, req_wanted, req_mask, NETDEV_FEATURE_COUNT);
 	bitmap_andnot(new_wanted, old_wanted, req_mask, NETDEV_FEATURE_COUNT);
 	bitmap_or(req_wanted, new_wanted, req_wanted, NETDEV_FEATURE_COUNT);
 	if (!bitmap_equal(req_wanted, old_wanted, NETDEV_FEATURE_COUNT)) {
 		dev->wanted_features &= ~dev->hw_features;
 		dev->wanted_features |= ethnl_bitmap_to_features(req_wanted) & dev->hw_features;
 		__netdev_update_features(dev);
 	}
 	ethnl_features_to_bitmap(new_active, dev->features);
 	mod = !bitmap_equal(old_active, new_active, NETDEV_FEATURE_COUNT);

 	ret = 0;
 	if (!(req_info.flags & ETHTOOL_FLAG_OMIT_REPLY)) {
 		bool compact = req_info.flags & ETHTOOL_FLAG_COMPACT_BITSETS;

 		bitmap_xor(wanted_diff_mask, req_wanted, new_active,
 			   NETDEV_FEATURE_COUNT);
 		bitmap_xor(active_diff_mask, old_active, new_active,
 			   NETDEV_FEATURE_COUNT);
 		bitmap_and(wanted_diff_mask, wanted_diff_mask, req_mask,
 			   NETDEV_FEATURE_COUNT);
 		bitmap_and(req_wanted, req_wanted, wanted_diff_mask,
 			   NETDEV_FEATURE_COUNT);
 		bitmap_and(new_active, new_active, active_diff_mask,
 			   NETDEV_FEATURE_COUNT);

 		ret = features_send_reply(dev, info, req_wanted,
 					  wanted_diff_mask, new_active,
 					  active_diff_mask, compact);
 	}
 	if (mod)
 		ethtool_notify(dev, ETHTOOL_MSG_FEATURES_NTF, NULL);

 out_rtnl:
 	rtnl_unlock();
 	dev_put(dev);
 	return ret;
 }
	// SPDX-License-Identifier: GPL-2.0-only

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

	struct features_req_info {
	struct ethnl_req_info base;
	};

	struct features_reply_data {
	struct ethnl_reply_data base;
	u32 hw[ETHTOOL_DEV_FEATURE_WORDS];
	u32 wanted[ETHTOOL_DEV_FEATURE_WORDS];
	u32 active[ETHTOOL_DEV_FEATURE_WORDS];
	u32 nochange[ETHTOOL_DEV_FEATURE_WORDS];
	u32 all[ETHTOOL_DEV_FEATURE_WORDS];
	};

	#define FEATURES_REPDATA(__reply_base) \
	container_of(__reply_base, struct features_reply_data, base)

	static const struct nla_policy
	features_get_policy[ETHTOOL_A_FEATURES_MAX + 1] = {
	[ETHTOOL_A_FEATURES_UNSPEC] = { .type = NLA_REJECT },
	[ETHTOOL_A_FEATURES_HEADER] = { .type = NLA_NESTED },
	[ETHTOOL_A_FEATURES_HW] = { .type = NLA_REJECT },
	[ETHTOOL_A_FEATURES_WANTED] = { .type = NLA_REJECT },
	[ETHTOOL_A_FEATURES_ACTIVE] = { .type = NLA_REJECT },
	[ETHTOOL_A_FEATURES_NOCHANGE] = { .type = NLA_REJECT },
	};

	static void ethnl_features_to_bitmap32(u32 *dest, netdev_features_t src)
	{
	unsigned int i;

	for (i = 0; i < ETHTOOL_DEV_FEATURE_WORDS; i++)
	dest[i] = src >> (32 * i);
	}

	static int features_prepare_data(const struct ethnl_req_info *req_base,
	struct ethnl_reply_data *reply_base,
	struct genl_info *info)
	{
	struct features_reply_data *data = FEATURES_REPDATA(reply_base);
	struct net_device *dev = reply_base->dev;
	netdev_features_t all_features;

	ethnl_features_to_bitmap32(data->hw, dev->hw_features);
	ethnl_features_to_bitmap32(data->wanted, dev->wanted_features);
	ethnl_features_to_bitmap32(data->active, dev->features);
	ethnl_features_to_bitmap32(data->nochange, NETIF_F_NEVER_CHANGE);
	all_features = GENMASK_ULL(NETDEV_FEATURE_COUNT - 1, 0);
	ethnl_features_to_bitmap32(data->all, all_features);

	return 0;
	}

	static int features_reply_size(const struct ethnl_req_info *req_base,
	const struct ethnl_reply_data *reply_base)
	{
	const struct features_reply_data *data = FEATURES_REPDATA(reply_base);
	bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
	unsigned int len = 0;
	int ret;

	ret = ethnl_bitset32_size(data->hw, data->all, NETDEV_FEATURE_COUNT,
	netdev_features_strings, compact);
	if (ret < 0)
	return ret;
	len += ret;
	ret = ethnl_bitset32_size(data->wanted, NULL, NETDEV_FEATURE_COUNT,
	netdev_features_strings, compact);
	if (ret < 0)
	return ret;
	len += ret;
	ret = ethnl_bitset32_size(data->active, NULL, NETDEV_FEATURE_COUNT,
	netdev_features_strings, compact);
	if (ret < 0)
	return ret;
	len += ret;
	ret = ethnl_bitset32_size(data->nochange, NULL, NETDEV_FEATURE_COUNT,
	netdev_features_strings, compact);
	if (ret < 0)
	return ret;
	len += ret;

	return len;
	}

	static int features_fill_reply(struct sk_buff *skb,
	const struct ethnl_req_info *req_base,
	const struct ethnl_reply_data *reply_base)
	{
	const struct features_reply_data *data = FEATURES_REPDATA(reply_base);
	bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
	int ret;

	ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_HW, data->hw,
	data->all, NETDEV_FEATURE_COUNT,
	netdev_features_strings, compact);
	if (ret < 0)
	return ret;
	ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_WANTED, data->wanted,
	NULL, NETDEV_FEATURE_COUNT,
	netdev_features_strings, compact);
	if (ret < 0)
	return ret;
	ret = ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_ACTIVE, data->active,
	NULL, NETDEV_FEATURE_COUNT,
	netdev_features_strings, compact);
	if (ret < 0)
	return ret;
	return ethnl_put_bitset32(skb, ETHTOOL_A_FEATURES_NOCHANGE,
	data->nochange, NULL, NETDEV_FEATURE_COUNT,
	netdev_features_strings, compact);
	}

	const struct ethnl_request_ops ethnl_features_request_ops = {
	.request_cmd = ETHTOOL_MSG_FEATURES_GET,
	.reply_cmd = ETHTOOL_MSG_FEATURES_GET_REPLY,
	.hdr_attr = ETHTOOL_A_FEATURES_HEADER,
	.max_attr = ETHTOOL_A_FEATURES_MAX,
	.req_info_size = sizeof(struct features_req_info),
	.reply_data_size = sizeof(struct features_reply_data),
	.request_policy = features_get_policy,

	.prepare_data = features_prepare_data,
	.reply_size = features_reply_size,
	.fill_reply = features_fill_reply,
	};

	/* FEATURES_SET */

	static const struct nla_policy
	features_set_policy[ETHTOOL_A_FEATURES_MAX + 1] = {
	[ETHTOOL_A_FEATURES_UNSPEC] = { .type = NLA_REJECT },
	[ETHTOOL_A_FEATURES_HEADER] = { .type = NLA_NESTED },
	[ETHTOOL_A_FEATURES_HW] = { .type = NLA_REJECT },
	[ETHTOOL_A_FEATURES_WANTED] = { .type = NLA_NESTED },
	[ETHTOOL_A_FEATURES_ACTIVE] = { .type = NLA_REJECT },
	[ETHTOOL_A_FEATURES_NOCHANGE] = { .type = NLA_REJECT },
	};

	static void ethnl_features_to_bitmap(unsigned long *dest, netdev_features_t val)
	{
	const unsigned int words = BITS_TO_LONGS(NETDEV_FEATURE_COUNT);
	unsigned int i;

	bitmap_zero(dest, NETDEV_FEATURE_COUNT);
	for (i = 0; i < words; i++)
	dest[i] = (unsigned long)(val >> (i * BITS_PER_LONG));
	}

	static netdev_features_t ethnl_bitmap_to_features(unsigned long *src)
	{
	const unsigned int nft_bits = sizeof(netdev_features_t) * BITS_PER_BYTE;
	const unsigned int words = BITS_TO_LONGS(NETDEV_FEATURE_COUNT);
	netdev_features_t ret = 0;
	unsigned int i;

	for (i = 0; i < words; i++)
	ret \|= (netdev_features_t)(src[i]) << (i * BITS_PER_LONG);
	ret &= ~(netdev_features_t)0 >> (nft_bits - NETDEV_FEATURE_COUNT);
	return ret;
	}

	static int features_send_reply(struct net_device dev, struct genl_info info,
	const unsigned long *wanted,
	const unsigned long *wanted_mask,
	const unsigned long *active,
	const unsigned long *active_mask, bool compact)
	{
	struct sk_buff *rskb;
	void *reply_payload;
	int reply_len = 0;
	int ret;

	reply_len = ethnl_reply_header_size();
	ret = ethnl_bitset_size(wanted, wanted_mask, NETDEV_FEATURE_COUNT,
	netdev_features_strings, compact);
	if (ret < 0)
	goto err;
	reply_len += ret;
	ret = ethnl_bitset_size(active, active_mask, NETDEV_FEATURE_COUNT,
	netdev_features_strings, compact);
	if (ret < 0)
	goto err;
	reply_len += ret;

	ret = -ENOMEM;
	rskb = ethnl_reply_init(reply_len, dev, ETHTOOL_MSG_FEATURES_SET_REPLY,
	ETHTOOL_A_FEATURES_HEADER, info,
	&reply_payload);
	if (!rskb)
	goto err;

	ret = ethnl_put_bitset(rskb, ETHTOOL_A_FEATURES_WANTED, wanted,
	wanted_mask, NETDEV_FEATURE_COUNT,
	netdev_features_strings, compact);
	if (ret < 0)
	goto nla_put_failure;
	ret = ethnl_put_bitset(rskb, ETHTOOL_A_FEATURES_ACTIVE, active,
	active_mask, NETDEV_FEATURE_COUNT,
	netdev_features_strings, compact);
	if (ret < 0)
	goto nla_put_failure;

	genlmsg_end(rskb, reply_payload);
	ret = genlmsg_reply(rskb, info);
	return ret;

	nla_put_failure:
	nlmsg_free(rskb);
	WARN_ONCE(1, "calculated message payload length (%d) not sufficient\n",
	reply_len);
	err:
	GENL_SET_ERR_MSG(info, "failed to send reply message");
	return ret;
	}

	int ethnl_set_features(struct sk_buff skb, struct genl_info info)
	{
	DECLARE_BITMAP(wanted_diff_mask, NETDEV_FEATURE_COUNT);
	DECLARE_BITMAP(active_diff_mask, NETDEV_FEATURE_COUNT);
	DECLARE_BITMAP(old_active, NETDEV_FEATURE_COUNT);
	DECLARE_BITMAP(old_wanted, NETDEV_FEATURE_COUNT);
	DECLARE_BITMAP(new_active, NETDEV_FEATURE_COUNT);
	DECLARE_BITMAP(new_wanted, NETDEV_FEATURE_COUNT);
	DECLARE_BITMAP(req_wanted, NETDEV_FEATURE_COUNT);
	DECLARE_BITMAP(req_mask, NETDEV_FEATURE_COUNT);
	struct nlattr *tb[ETHTOOL_A_FEATURES_MAX + 1];
	struct ethnl_req_info req_info = {};
	struct net_device *dev;
	bool mod;
	int ret;

	ret = nlmsg_parse(info->nlhdr, GENL_HDRLEN, tb,
	ETHTOOL_A_FEATURES_MAX, features_set_policy,
	info->extack);
	if (ret < 0)
	return ret;
	if (!tb[ETHTOOL_A_FEATURES_WANTED])
	return -EINVAL;
	ret = ethnl_parse_header_dev_get(&req_info,
	tb[ETHTOOL_A_FEATURES_HEADER],
	genl_info_net(info), info->extack,
	true);
	if (ret < 0)
	return ret;
	dev = req_info.dev;

	rtnl_lock();
	ethnl_features_to_bitmap(old_active, dev->features);
	ethnl_features_to_bitmap(old_wanted, dev->wanted_features);
	ret = ethnl_parse_bitset(req_wanted, req_mask, NETDEV_FEATURE_COUNT,
	tb[ETHTOOL_A_FEATURES_WANTED],
	netdev_features_strings, info->extack);
	if (ret < 0)
	goto out_rtnl;
	if (ethnl_bitmap_to_features(req_mask) & ~NETIF_F_ETHTOOL_BITS) {
	GENL_SET_ERR_MSG(info, "attempt to change non-ethtool features");
	ret = -EINVAL;
	goto out_rtnl;
	}

	/* set req_wanted bits not in req_mask from old_wanted */
	bitmap_and(req_wanted, req_wanted, req_mask, NETDEV_FEATURE_COUNT);
	bitmap_andnot(new_wanted, old_wanted, req_mask, NETDEV_FEATURE_COUNT);
	bitmap_or(req_wanted, new_wanted, req_wanted, NETDEV_FEATURE_COUNT);
	if (!bitmap_equal(req_wanted, old_wanted, NETDEV_FEATURE_COUNT)) {
	dev->wanted_features &= ~dev->hw_features;
	dev->wanted_features \|= ethnl_bitmap_to_features(req_wanted) & dev->hw_features;
	__netdev_update_features(dev);
	}
	ethnl_features_to_bitmap(new_active, dev->features);
	mod = !bitmap_equal(old_active, new_active, NETDEV_FEATURE_COUNT);

	ret = 0;
	if (!(req_info.flags & ETHTOOL_FLAG_OMIT_REPLY)) {
	bool compact = req_info.flags & ETHTOOL_FLAG_COMPACT_BITSETS;

	bitmap_xor(wanted_diff_mask, req_wanted, new_active,
	NETDEV_FEATURE_COUNT);
	bitmap_xor(active_diff_mask, old_active, new_active,
	NETDEV_FEATURE_COUNT);
	bitmap_and(wanted_diff_mask, wanted_diff_mask, req_mask,
	NETDEV_FEATURE_COUNT);
	bitmap_and(req_wanted, req_wanted, wanted_diff_mask,
	NETDEV_FEATURE_COUNT);
	bitmap_and(new_active, new_active, active_diff_mask,
	NETDEV_FEATURE_COUNT);

	ret = features_send_reply(dev, info, req_wanted,
	wanted_diff_mask, new_active,
	active_diff_mask, compact);
	}
	if (mod)
	ethtool_notify(dev, ETHTOOL_MSG_FEATURES_NTF, NULL);

	out_rtnl:
	rtnl_unlock();
	dev_put(dev);
	return ret;
	}