pause.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2
  3#include "netlink.h"
  4#include "common.h"
  5
  6struct pause_req_info {
  7	struct ethnl_req_info		base;
  8	enum ethtool_mac_stats_src	src;
  9};
 10
 11#define PAUSE_REQINFO(__req_base) \
 12	container_of(__req_base, struct pause_req_info, base)
 13
 14struct pause_reply_data {
 15	struct ethnl_reply_data		base;
 16	struct ethtool_pauseparam	pauseparam;
 17	struct ethtool_pause_stats	pausestat;
 18};
 19
 20#define PAUSE_REPDATA(__reply_base) \
 21	container_of(__reply_base, struct pause_reply_data, base)
 22
 23const struct nla_policy ethnl_pause_get_policy[] = {
 24	[ETHTOOL_A_PAUSE_HEADER]		=
 25		NLA_POLICY_NESTED(ethnl_header_policy_stats),
 26	[ETHTOOL_A_PAUSE_STATS_SRC]		=
 27		NLA_POLICY_MAX(NLA_U32, ETHTOOL_MAC_STATS_SRC_PMAC),
 28};
 29
 30static 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
 52static int pause_prepare_data(const struct ethnl_req_info *req_base,
 53			      struct ethnl_reply_data *reply_base,
 54			      const struct genl_info *info)
 55{
 56	const struct pause_req_info *req_info = PAUSE_REQINFO(req_base);
 57	struct pause_reply_data *data = PAUSE_REPDATA(reply_base);
 58	enum ethtool_mac_stats_src src = req_info->src;
 59	struct net_device *dev = reply_base->dev;
 60	int ret;
 61
 62	if (!dev->ethtool_ops->get_pauseparam)
 63		return -EOPNOTSUPP;
 64
 65	ethtool_stats_init((u64 *)&data->pausestat,
 66			   sizeof(data->pausestat) / 8);
 67	data->pausestat.src = src;
 68
 69	ret = ethnl_ops_begin(dev);
 70	if (ret < 0)
 71		return ret;
 72
 73	if ((src == ETHTOOL_MAC_STATS_SRC_EMAC ||
 74	     src == ETHTOOL_MAC_STATS_SRC_PMAC) &&
 75	    !__ethtool_dev_mm_supported(dev)) {
 76		NL_SET_ERR_MSG_MOD(info->extack,
 77				   "Device does not support MAC merge layer");
 78		ethnl_ops_complete(dev);
 79		return -EOPNOTSUPP;
 80	}
 81
 82	dev->ethtool_ops->get_pauseparam(dev, &data->pauseparam);
 83	if (req_base->flags & ETHTOOL_FLAG_STATS &&
 84	    dev->ethtool_ops->get_pause_stats)
 85		dev->ethtool_ops->get_pause_stats(dev, &data->pausestat);
 86
 87	ethnl_ops_complete(dev);
 88
 89	return 0;
 90}
 91
 92static int pause_reply_size(const struct ethnl_req_info *req_base,
 93			    const struct ethnl_reply_data *reply_base)
 94{
 95	int n = nla_total_size(sizeof(u8)) +	/* _PAUSE_AUTONEG */
 96		nla_total_size(sizeof(u8)) +	/* _PAUSE_RX */
 97		nla_total_size(sizeof(u8));	/* _PAUSE_TX */
 98
 99	if (req_base->flags & ETHTOOL_FLAG_STATS)
100		n += nla_total_size(0) +	/* _PAUSE_STATS */
101		     nla_total_size(sizeof(u32)) + /* _PAUSE_STATS_SRC */
102		     nla_total_size_64bit(sizeof(u64)) * ETHTOOL_PAUSE_STAT_CNT;
103	return n;
104}
105
106static int ethtool_put_stat(struct sk_buff *skb, u64 val, u16 attrtype,
107			    u16 padtype)
108{
109	if (val == ETHTOOL_STAT_NOT_SET)
110		return 0;
111	if (nla_put_u64_64bit(skb, attrtype, val, padtype))
112		return -EMSGSIZE;
113
114	return 0;
115}
116
117static int pause_put_stats(struct sk_buff *skb,
118			   const struct ethtool_pause_stats *pause_stats)
119{
120	const u16 pad = ETHTOOL_A_PAUSE_STAT_PAD;
121	struct nlattr *nest;
122
123	if (nla_put_u32(skb, ETHTOOL_A_PAUSE_STATS_SRC, pause_stats->src))
124		return -EMSGSIZE;
125
126	nest = nla_nest_start(skb, ETHTOOL_A_PAUSE_STATS);
127	if (!nest)
128		return -EMSGSIZE;
129
130	if (ethtool_put_stat(skb, pause_stats->tx_pause_frames,
131			     ETHTOOL_A_PAUSE_STAT_TX_FRAMES, pad) ||
132	    ethtool_put_stat(skb, pause_stats->rx_pause_frames,
133			     ETHTOOL_A_PAUSE_STAT_RX_FRAMES, pad))
134		goto err_cancel;
135
136	nla_nest_end(skb, nest);
137	return 0;
138
139err_cancel:
140	nla_nest_cancel(skb, nest);
141	return -EMSGSIZE;
142}
143
144static int pause_fill_reply(struct sk_buff *skb,
145			    const struct ethnl_req_info *req_base,
146			    const struct ethnl_reply_data *reply_base)
147{
148	const struct pause_reply_data *data = PAUSE_REPDATA(reply_base);
149	const struct ethtool_pauseparam *pauseparam = &data->pauseparam;
150
151	if (nla_put_u8(skb, ETHTOOL_A_PAUSE_AUTONEG, !!pauseparam->autoneg) ||
152	    nla_put_u8(skb, ETHTOOL_A_PAUSE_RX, !!pauseparam->rx_pause) ||
153	    nla_put_u8(skb, ETHTOOL_A_PAUSE_TX, !!pauseparam->tx_pause))
154		return -EMSGSIZE;
155
156	if (req_base->flags & ETHTOOL_FLAG_STATS &&
157	    pause_put_stats(skb, &data->pausestat))
158		return -EMSGSIZE;
159
160	return 0;
161}
162
163/* PAUSE_SET */
164
165const struct nla_policy ethnl_pause_set_policy[] = {
166	[ETHTOOL_A_PAUSE_HEADER]		=
167		NLA_POLICY_NESTED(ethnl_header_policy),
168	[ETHTOOL_A_PAUSE_AUTONEG]		= { .type = NLA_U8 },
169	[ETHTOOL_A_PAUSE_RX]			= { .type = NLA_U8 },
170	[ETHTOOL_A_PAUSE_TX]			= { .type = NLA_U8 },
171	[ETHTOOL_A_PAUSE_STATS_SRC]		= { .type = NLA_REJECT },
172};
173
174static int
175ethnl_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
183static int
184ethnl_set_pause(struct ethnl_req_info *req_info, struct genl_info *info)
185{
186	struct net_device *dev = req_info->dev;
187	struct ethtool_pauseparam params = {};
188	struct nlattr **tb = info->attrs;
189	bool mod = false;
190	int ret;
191
192	dev->ethtool_ops->get_pauseparam(dev, &params);
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);
197	if (!mod)
198		return 0;
199
200	ret = dev->ethtool_ops->set_pauseparam(dev, &params);
201	return ret < 0 ? ret : 1;
202}
203
204const 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};