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

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

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

struct pause_req_info {
	struct ethnl_req_info		base;
	enum ethtool_mac_stats_src	src;
};

#define PAUSE_REQINFO(__req_base) \
	container_of(__req_base, struct pause_req_info, base)

struct pause_reply_data {
	struct ethnl_reply_data		base;
	struct ethtool_pauseparam	pauseparam;
	struct ethtool_pause_stats	pausestat;
};

#define PAUSE_REPDATA(__reply_base) \
	container_of(__reply_base, struct pause_reply_data, base)

const struct nla_policy ethnl_pause_get_policy[] = {
	[ETHTOOL_A_PAUSE_HEADER]		=
		NLA_POLICY_NESTED(ethnl_header_policy_stats),
	[ETHTOOL_A_PAUSE_STATS_SRC]		=
		NLA_POLICY_MAX(NLA_U32, ETHTOOL_MAC_STATS_SRC_PMAC),
};

static int pause_parse_request(struct ethnl_req_info *req_base,
			       struct nlattr **tb,
			       struct netlink_ext_ack *extack)
{
	enum ethtool_mac_stats_src src = ETHTOOL_MAC_STATS_SRC_AGGREGATE;
	struct pause_req_info *req_info = PAUSE_REQINFO(req_base);

	if (tb[ETHTOOL_A_PAUSE_STATS_SRC]) {
		if (!(req_base->flags & ETHTOOL_FLAG_STATS)) {
			NL_SET_ERR_MSG_MOD(extack,
					   "ETHTOOL_FLAG_STATS must be set when requesting a source of stats");
			return -EINVAL;
		}

		src = nla_get_u32(tb[ETHTOOL_A_PAUSE_STATS_SRC]);
	}

	req_info->src = src;

	return 0;
}

static int pause_prepare_data(const struct ethnl_req_info *req_base,
			      struct ethnl_reply_data *reply_base,
			      struct genl_info *info)
{
	const struct pause_req_info *req_info = PAUSE_REQINFO(req_base);
	struct netlink_ext_ack *extack = info ? info->extack : NULL;
	struct pause_reply_data *data = PAUSE_REPDATA(reply_base);
	enum ethtool_mac_stats_src src = req_info->src;
	struct net_device *dev = reply_base->dev;
	int ret;

	if (!dev->ethtool_ops->get_pauseparam)
		return -EOPNOTSUPP;

	ethtool_stats_init((u64 *)&data->pausestat,
			   sizeof(data->pausestat) / 8);
	data->pausestat.src = src;

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

	if ((src == ETHTOOL_MAC_STATS_SRC_EMAC ||
	     src == ETHTOOL_MAC_STATS_SRC_PMAC) &&
	    !__ethtool_dev_mm_supported(dev)) {
		NL_SET_ERR_MSG_MOD(extack,
				   "Device does not support MAC merge layer");
		ethnl_ops_complete(dev);
		return -EOPNOTSUPP;
	}

	dev->ethtool_ops->get_pauseparam(dev, &data->pauseparam);
	if (req_base->flags & ETHTOOL_FLAG_STATS &&
	    dev->ethtool_ops->get_pause_stats)
		dev->ethtool_ops->get_pause_stats(dev, &data->pausestat);

	ethnl_ops_complete(dev);

	return 0;
}

static int pause_reply_size(const struct ethnl_req_info *req_base,
			    const struct ethnl_reply_data *reply_base)
{
	int n = nla_total_size(sizeof(u8)) +	/* _PAUSE_AUTONEG */
		nla_total_size(sizeof(u8)) +	/* _PAUSE_RX */
		nla_total_size(sizeof(u8));	/* _PAUSE_TX */

	if (req_base->flags & ETHTOOL_FLAG_STATS)
		n += nla_total_size(0) +	/* _PAUSE_STATS */
		     nla_total_size(sizeof(u32)) + /* _PAUSE_STATS_SRC */
		     nla_total_size_64bit(sizeof(u64)) * ETHTOOL_PAUSE_STAT_CNT;
	return n;
}

static int ethtool_put_stat(struct sk_buff *skb, u64 val, u16 attrtype,
			    u16 padtype)
{
	if (val == ETHTOOL_STAT_NOT_SET)
		return 0;
	if (nla_put_u64_64bit(skb, attrtype, val, padtype))
		return -EMSGSIZE;

	return 0;
}

static int pause_put_stats(struct sk_buff *skb,
			   const struct ethtool_pause_stats *pause_stats)
{
	const u16 pad = ETHTOOL_A_PAUSE_STAT_PAD;
	struct nlattr *nest;

	if (nla_put_u32(skb, ETHTOOL_A_PAUSE_STATS_SRC, pause_stats->src))
		return -EMSGSIZE;

	nest = nla_nest_start(skb, ETHTOOL_A_PAUSE_STATS);
	if (!nest)
		return -EMSGSIZE;

	if (ethtool_put_stat(skb, pause_stats->tx_pause_frames,
			     ETHTOOL_A_PAUSE_STAT_TX_FRAMES, pad) ||
	    ethtool_put_stat(skb, pause_stats->rx_pause_frames,
			     ETHTOOL_A_PAUSE_STAT_RX_FRAMES, pad))
		goto err_cancel;

	nla_nest_end(skb, nest);
	return 0;

err_cancel:
	nla_nest_cancel(skb, nest);
	return -EMSGSIZE;
}

static int pause_fill_reply(struct sk_buff *skb,
			    const struct ethnl_req_info *req_base,
			    const struct ethnl_reply_data *reply_base)
{
	const struct pause_reply_data *data = PAUSE_REPDATA(reply_base);
	const struct ethtool_pauseparam *pauseparam = &data->pauseparam;

	if (nla_put_u8(skb, ETHTOOL_A_PAUSE_AUTONEG, !!pauseparam->autoneg) ||
	    nla_put_u8(skb, ETHTOOL_A_PAUSE_RX, !!pauseparam->rx_pause) ||
	    nla_put_u8(skb, ETHTOOL_A_PAUSE_TX, !!pauseparam->tx_pause))
		return -EMSGSIZE;

	if (req_base->flags & ETHTOOL_FLAG_STATS &&
	    pause_put_stats(skb, &data->pausestat))
		return -EMSGSIZE;

	return 0;
}

/* PAUSE_SET */

const struct nla_policy ethnl_pause_set_policy[] = {
	[ETHTOOL_A_PAUSE_HEADER]		=
		NLA_POLICY_NESTED(ethnl_header_policy),
	[ETHTOOL_A_PAUSE_AUTONEG]		= { .type = NLA_U8 },
	[ETHTOOL_A_PAUSE_RX]			= { .type = NLA_U8 },
	[ETHTOOL_A_PAUSE_TX]			= { .type = NLA_U8 },
};

static int
ethnl_set_pause_validate(struct ethnl_req_info *req_info,
			 struct genl_info *info)
{
	const struct ethtool_ops *ops = req_info->dev->ethtool_ops;

	return ops->get_pauseparam && ops->set_pauseparam ? 1 : -EOPNOTSUPP;
}

static int
ethnl_set_pause(struct ethnl_req_info *req_info, struct genl_info *info)
{
	struct net_device *dev = req_info->dev;
	struct ethtool_pauseparam params = {};
	struct nlattr **tb = info->attrs;
	bool mod = false;
	int ret;

	dev->ethtool_ops->get_pauseparam(dev, &params);

	ethnl_update_bool32(&params.autoneg, tb[ETHTOOL_A_PAUSE_AUTONEG], &mod);
	ethnl_update_bool32(&params.rx_pause, tb[ETHTOOL_A_PAUSE_RX], &mod);
	ethnl_update_bool32(&params.tx_pause, tb[ETHTOOL_A_PAUSE_TX], &mod);
	if (!mod)
		return 0;

	ret = dev->ethtool_ops->set_pauseparam(dev, &params);
	return ret < 0 ? ret : 1;
}

const struct ethnl_request_ops ethnl_pause_request_ops = {
	.request_cmd		= ETHTOOL_MSG_PAUSE_GET,
	.reply_cmd		= ETHTOOL_MSG_PAUSE_GET_REPLY,
	.hdr_attr		= ETHTOOL_A_PAUSE_HEADER,
	.req_info_size		= sizeof(struct pause_req_info),
	.reply_data_size	= sizeof(struct pause_reply_data),

	.parse_request		= pause_parse_request,
	.prepare_data		= pause_prepare_data,
	.reply_size		= pause_reply_size,
	.fill_reply		= pause_fill_reply,

	.set_validate		= ethnl_set_pause_validate,
	.set			= ethnl_set_pause,
	.set_ntf_cmd		= ETHTOOL_MSG_PAUSE_NTF,
};
Commit	Line	Data
7f59fb32 MK	1	// SPDX-License-Identifier: GPL-2.0-only
	2
	3	#include "netlink.h"
	4	#include "common.h"
	5
	6	struct pause_req_info {
	7	struct ethnl_req_info base;
04692c90	8	enum ethtool_mac_stats_src src;
7f59fb32 MK	9	};
7f59fb32 MK	10
04692c90 VO	11	#define PAUSE_REQINFO(__req_base) \
	12	container_of(__req_base, struct pause_req_info, base)
	13
7f59fb32 MK	14	struct pause_reply_data {
	15	struct ethnl_reply_data base;
	16	struct ethtool_pauseparam pauseparam;
9a27a330	17	struct ethtool_pause_stats pausestat;
7f59fb32 MK	18	};
	19
	20	#define PAUSE_REPDATA(__reply_base) \
	21	container_of(__reply_base, struct pause_reply_data, base)
	22
ff419afa	23	const struct nla_policy ethnl_pause_get_policy[] = {
329d9c33	24	[ETHTOOL_A_PAUSE_HEADER] =
a0de1cd3	25	NLA_POLICY_NESTED(ethnl_header_policy_stats),
04692c90 VO	26	[ETHTOOL_A_PAUSE_STATS_SRC] =
04692c90 VO	27	NLA_POLICY_MAX(NLA_U32, ETHTOOL_MAC_STATS_SRC_PMAC),
7f59fb32 MK	28	};
7f59fb32 MK	29
04692c90 VO	30	static int pause_parse_request(struct ethnl_req_info *req_base,
	31	struct nlattr **tb,
	32	struct netlink_ext_ack *extack)
	33	{
	34	enum ethtool_mac_stats_src src = ETHTOOL_MAC_STATS_SRC_AGGREGATE;
	35	struct pause_req_info *req_info = PAUSE_REQINFO(req_base);
	36
	37	if (tb[ETHTOOL_A_PAUSE_STATS_SRC]) {
	38	if (!(req_base->flags & ETHTOOL_FLAG_STATS)) {
	39	NL_SET_ERR_MSG_MOD(extack,
	40	"ETHTOOL_FLAG_STATS must be set when requesting a source of stats");
	41	return -EINVAL;
	42	}
	43
	44	src = nla_get_u32(tb[ETHTOOL_A_PAUSE_STATS_SRC]);
	45	}
	46
	47	req_info->src = src;
	48
	49	return 0;
	50	}
	51
7f59fb32 MK	52	static int pause_prepare_data(const struct ethnl_req_info *req_base,
	53	struct ethnl_reply_data *reply_base,
	54	struct genl_info *info)
	55	{
04692c90	56	const struct pause_req_info *req_info = PAUSE_REQINFO(req_base);
f5be9caf	57	struct netlink_ext_ack *extack = info ? info->extack : NULL;
7f59fb32	58	struct pause_reply_data *data = PAUSE_REPDATA(reply_base);
04692c90	59	enum ethtool_mac_stats_src src = req_info->src;
7f59fb32 MK	60	struct net_device *dev = reply_base->dev;
	61	int ret;
	62
	63	if (!dev->ethtool_ops->get_pauseparam)
	64	return -EOPNOTSUPP;
9a27a330	65
16756d3e JK	66	ethtool_stats_init((u64 *)&data->pausestat,
16756d3e JK	67	sizeof(data->pausestat) / 8);
04692c90	68	data->pausestat.src = src;
16756d3e	69
7f59fb32 MK	70	ret = ethnl_ops_begin(dev);
	71	if (ret < 0)
	72	return ret;
04692c90 VO	73
	74	if ((src == ETHTOOL_MAC_STATS_SRC_EMAC \|\|
	75	src == ETHTOOL_MAC_STATS_SRC_PMAC) &&
	76	!__ethtool_dev_mm_supported(dev)) {
	77	NL_SET_ERR_MSG_MOD(extack,
	78	"Device does not support MAC merge layer");
	79	ethnl_ops_complete(dev);
	80	return -EOPNOTSUPP;
	81	}
	82
7f59fb32	83	dev->ethtool_ops->get_pauseparam(dev, &data->pauseparam);
9a27a330	84	if (req_base->flags & ETHTOOL_FLAG_STATS &&
16756d3e	85	dev->ethtool_ops->get_pause_stats)
9a27a330	86	dev->ethtool_ops->get_pause_stats(dev, &data->pausestat);
04692c90	87
7f59fb32 MK	88	ethnl_ops_complete(dev);
	89
	90	return 0;
	91	}
	92
	93	static int pause_reply_size(const struct ethnl_req_info *req_base,
	94	const struct ethnl_reply_data *reply_base)
	95	{
9a27a330	96	int n = nla_total_size(sizeof(u8)) + /* _PAUSE_AUTONEG */
7f59fb32 MK	97	nla_total_size(sizeof(u8)) + /* _PAUSE_RX */
7f59fb32 MK	98	nla_total_size(sizeof(u8)); /* _PAUSE_TX */
9a27a330 JK	99
	100	if (req_base->flags & ETHTOOL_FLAG_STATS)
	101	n += nla_total_size(0) + /* _PAUSE_STATS */
04692c90	102	nla_total_size(sizeof(u32)) + /* _PAUSE_STATS_SRC */
1aabe578	103	nla_total_size_64bit(sizeof(u64)) * ETHTOOL_PAUSE_STAT_CNT;
9a27a330 JK	104	return n;
	105	}
	106
	107	static int ethtool_put_stat(struct sk_buff *skb, u64 val, u16 attrtype,
	108	u16 padtype)
	109	{
	110	if (val == ETHTOOL_STAT_NOT_SET)
	111	return 0;
	112	if (nla_put_u64_64bit(skb, attrtype, val, padtype))
	113	return -EMSGSIZE;
	114
	115	return 0;
	116	}
	117
	118	static int pause_put_stats(struct sk_buff *skb,
	119	const struct ethtool_pause_stats *pause_stats)
	120	{
	121	const u16 pad = ETHTOOL_A_PAUSE_STAT_PAD;
	122	struct nlattr *nest;
	123
04692c90 VO	124	if (nla_put_u32(skb, ETHTOOL_A_PAUSE_STATS_SRC, pause_stats->src))
	125	return -EMSGSIZE;
	126
9a27a330 JK	127	nest = nla_nest_start(skb, ETHTOOL_A_PAUSE_STATS);
	128	if (!nest)
	129	return -EMSGSIZE;
	130
	131	if (ethtool_put_stat(skb, pause_stats->tx_pause_frames,
	132	ETHTOOL_A_PAUSE_STAT_TX_FRAMES, pad) \|\|
	133	ethtool_put_stat(skb, pause_stats->rx_pause_frames,
	134	ETHTOOL_A_PAUSE_STAT_RX_FRAMES, pad))
	135	goto err_cancel;
	136
	137	nla_nest_end(skb, nest);
	138	return 0;
	139
	140	err_cancel:
	141	nla_nest_cancel(skb, nest);
	142	return -EMSGSIZE;
7f59fb32 MK	143	}
	144
	145	static int pause_fill_reply(struct sk_buff *skb,
	146	const struct ethnl_req_info *req_base,
	147	const struct ethnl_reply_data *reply_base)
	148	{
	149	const struct pause_reply_data *data = PAUSE_REPDATA(reply_base);
	150	const struct ethtool_pauseparam *pauseparam = &data->pauseparam;
	151
	152	if (nla_put_u8(skb, ETHTOOL_A_PAUSE_AUTONEG, !!pauseparam->autoneg) \|\|
	153	nla_put_u8(skb, ETHTOOL_A_PAUSE_RX, !!pauseparam->rx_pause) \|\|
	154	nla_put_u8(skb, ETHTOOL_A_PAUSE_TX, !!pauseparam->tx_pause))
	155	return -EMSGSIZE;
	156
9a27a330 JK	157	if (req_base->flags & ETHTOOL_FLAG_STATS &&
	158	pause_put_stats(skb, &data->pausestat))
	159	return -EMSGSIZE;
	160
7f59fb32 MK	161	return 0;
	162	}
	163
3ab87993 MK	164	/* PAUSE_SET */
3ab87993 MK	165
ff419afa	166	const struct nla_policy ethnl_pause_set_policy[] = {
329d9c33 JK	167	[ETHTOOL_A_PAUSE_HEADER] =
329d9c33 JK	168	NLA_POLICY_NESTED(ethnl_header_policy),
3ab87993 MK	169	[ETHTOOL_A_PAUSE_AUTONEG] = { .type = NLA_U8 },
	170	[ETHTOOL_A_PAUSE_RX] = { .type = NLA_U8 },
	171	[ETHTOOL_A_PAUSE_TX] = { .type = NLA_U8 },
	172	};
	173
99132b6e JK	174	static int
	175	ethnl_set_pause_validate(struct ethnl_req_info *req_info,
	176	struct genl_info *info)
	177	{
	178	const struct ethtool_ops *ops = req_info->dev->ethtool_ops;
	179
	180	return ops->get_pauseparam && ops->set_pauseparam ? 1 : -EOPNOTSUPP;
	181	}
	182
	183	static int
	184	ethnl_set_pause(struct ethnl_req_info req_info, struct genl_info info)
3ab87993	185	{
99132b6e	186	struct net_device *dev = req_info->dev;
3ab87993	187	struct ethtool_pauseparam params = {};
5028588b	188	struct nlattr **tb = info->attrs;
3ab87993 MK	189	bool mod = false;
	190	int ret;
	191
99132b6e	192	dev->ethtool_ops->get_pauseparam(dev, &params);
3ab87993 MK	193
	194	ethnl_update_bool32(&params.autoneg, tb[ETHTOOL_A_PAUSE_AUTONEG], &mod);
	195	ethnl_update_bool32(&params.rx_pause, tb[ETHTOOL_A_PAUSE_RX], &mod);
	196	ethnl_update_bool32(&params.tx_pause, tb[ETHTOOL_A_PAUSE_TX], &mod);
3ab87993	197	if (!mod)
99132b6e	198	return 0;
3ab87993 MK	199
3ab87993 MK	200	ret = dev->ethtool_ops->set_pauseparam(dev, &params);
99132b6e	201	return ret < 0 ? ret : 1;
3ab87993	202	}
99132b6e JK	203
	204	const struct ethnl_request_ops ethnl_pause_request_ops = {
	205	.request_cmd = ETHTOOL_MSG_PAUSE_GET,
	206	.reply_cmd = ETHTOOL_MSG_PAUSE_GET_REPLY,
	207	.hdr_attr = ETHTOOL_A_PAUSE_HEADER,
	208	.req_info_size = sizeof(struct pause_req_info),
	209	.reply_data_size = sizeof(struct pause_reply_data),
	210
	211	.parse_request = pause_parse_request,
	212	.prepare_data = pause_prepare_data,
	213	.reply_size = pause_reply_size,
	214	.fill_reply = pause_fill_reply,
	215
	216	.set_validate = ethnl_set_pause_validate,
	217	.set = ethnl_set_pause,
	218	.set_ntf_cmd = ETHTOOL_MSG_PAUSE_NTF,
	219	};