xref: /linux/net/ethtool/pause.c (revision 05e352444b2430de4b183b4a988085381e5fd6ad)
1 // SPDX-License-Identifier: GPL-2.0-only
2 
3 #include "common.h"
4 #include "netlink.h"
5 
6 struct 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 
14 struct 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 
23 const 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 
30 static int pause_parse_request(struct ethnl_req_info *req_base,
31 			       const struct genl_info *info,
32 			       struct nlattr **tb,
33 			       struct netlink_ext_ack *extack)
34 {
35 	enum ethtool_mac_stats_src src = ETHTOOL_MAC_STATS_SRC_AGGREGATE;
36 	struct pause_req_info *req_info = PAUSE_REQINFO(req_base);
37 
38 	if (tb[ETHTOOL_A_PAUSE_STATS_SRC]) {
39 		if (!(req_base->flags & ETHTOOL_FLAG_STATS)) {
40 			NL_SET_ERR_MSG_MOD(extack,
41 					   "ETHTOOL_FLAG_STATS must be set when requesting a source of stats");
42 			return -EINVAL;
43 		}
44 
45 		src = nla_get_u32(tb[ETHTOOL_A_PAUSE_STATS_SRC]);
46 	}
47 
48 	req_info->src = src;
49 
50 	return 0;
51 }
52 
53 static int pause_prepare_data(const struct ethnl_req_info *req_base,
54 			      struct ethnl_reply_data *reply_base,
55 			      const struct genl_info *info)
56 {
57 	const struct pause_req_info *req_info = PAUSE_REQINFO(req_base);
58 	struct pause_reply_data *data = PAUSE_REPDATA(reply_base);
59 	enum ethtool_mac_stats_src src = req_info->src;
60 	struct net_device *dev = reply_base->dev;
61 	int ret;
62 
63 	if (!dev->ethtool_ops->get_pauseparam)
64 		return -EOPNOTSUPP;
65 
66 	ethtool_stats_init((u64 *)&data->pausestat,
67 			   sizeof(data->pausestat) / 8);
68 	data->pausestat.src = src;
69 
70 	ret = ethnl_ops_begin(dev);
71 	if (ret < 0)
72 		return ret;
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(info->extack,
78 				   "Device does not support MAC merge layer");
79 		ethnl_ops_complete(dev);
80 		return -EOPNOTSUPP;
81 	}
82 
83 	dev->ethtool_ops->get_pauseparam(dev, &data->pauseparam);
84 	if (req_base->flags & ETHTOOL_FLAG_STATS &&
85 	    dev->ethtool_ops->get_pause_stats)
86 		dev->ethtool_ops->get_pause_stats(dev, &data->pausestat);
87 
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 {
96 	int n = nla_total_size(sizeof(u8)) +	/* _PAUSE_AUTONEG */
97 		nla_total_size(sizeof(u8)) +	/* _PAUSE_RX */
98 		nla_total_size(sizeof(u8));	/* _PAUSE_TX */
99 
100 	if (req_base->flags & ETHTOOL_FLAG_STATS)
101 		n += nla_total_size(0) +	/* _PAUSE_STATS */
102 		     nla_total_size(sizeof(u32)) + /* _PAUSE_STATS_SRC */
103 		     nla_total_size_64bit(sizeof(u64)) * ETHTOOL_PAUSE_STAT_CNT;
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 
124 	if (nla_put_u32(skb, ETHTOOL_A_PAUSE_STATS_SRC, pause_stats->src))
125 		return -EMSGSIZE;
126 
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 	    ethtool_put_stat(skb, pause_stats->tx_pause_storm_events,
136 			     ETHTOOL_A_PAUSE_STAT_TX_PAUSE_STORM_EVENTS, pad))
137 		goto err_cancel;
138 
139 	nla_nest_end(skb, nest);
140 	return 0;
141 
142 err_cancel:
143 	nla_nest_cancel(skb, nest);
144 	return -EMSGSIZE;
145 }
146 
147 static int pause_fill_reply(struct sk_buff *skb,
148 			    const struct ethnl_req_info *req_base,
149 			    const struct ethnl_reply_data *reply_base)
150 {
151 	const struct pause_reply_data *data = PAUSE_REPDATA(reply_base);
152 	const struct ethtool_pauseparam *pauseparam = &data->pauseparam;
153 
154 	if (nla_put_u8(skb, ETHTOOL_A_PAUSE_AUTONEG, !!pauseparam->autoneg) ||
155 	    nla_put_u8(skb, ETHTOOL_A_PAUSE_RX, !!pauseparam->rx_pause) ||
156 	    nla_put_u8(skb, ETHTOOL_A_PAUSE_TX, !!pauseparam->tx_pause))
157 		return -EMSGSIZE;
158 
159 	if (req_base->flags & ETHTOOL_FLAG_STATS &&
160 	    pause_put_stats(skb, &data->pausestat))
161 		return -EMSGSIZE;
162 
163 	return 0;
164 }
165 
166 /* PAUSE_SET */
167 
168 const struct nla_policy ethnl_pause_set_policy[] = {
169 	[ETHTOOL_A_PAUSE_HEADER]		=
170 		NLA_POLICY_NESTED(ethnl_header_policy),
171 	[ETHTOOL_A_PAUSE_AUTONEG]		= { .type = NLA_U8 },
172 	[ETHTOOL_A_PAUSE_RX]			= { .type = NLA_U8 },
173 	[ETHTOOL_A_PAUSE_TX]			= { .type = NLA_U8 },
174 	[ETHTOOL_A_PAUSE_STATS_SRC]		= { .type = NLA_REJECT },
175 };
176 
177 static int
178 ethnl_set_pause_validate(struct ethnl_req_info *req_info,
179 			 struct genl_info *info)
180 {
181 	const struct ethtool_ops *ops = req_info->dev->ethtool_ops;
182 
183 	return ops->get_pauseparam && ops->set_pauseparam ? 1 : -EOPNOTSUPP;
184 }
185 
186 static int
187 ethnl_set_pause(struct ethnl_req_info *req_info, struct genl_info *info)
188 {
189 	struct net_device *dev = req_info->dev;
190 	struct ethtool_pauseparam params = {};
191 	struct nlattr **tb = info->attrs;
192 	bool mod = false;
193 	int ret;
194 
195 	dev->ethtool_ops->get_pauseparam(dev, &params);
196 
197 	ethnl_update_bool32(&params.autoneg, tb[ETHTOOL_A_PAUSE_AUTONEG], &mod);
198 	ethnl_update_bool32(&params.rx_pause, tb[ETHTOOL_A_PAUSE_RX], &mod);
199 	ethnl_update_bool32(&params.tx_pause, tb[ETHTOOL_A_PAUSE_TX], &mod);
200 	if (!mod)
201 		return 0;
202 
203 	ret = dev->ethtool_ops->set_pauseparam(dev, &params);
204 	return ret < 0 ? ret : 1;
205 }
206 
207 const struct ethnl_request_ops ethnl_pause_request_ops = {
208 	.request_cmd		= ETHTOOL_MSG_PAUSE_GET,
209 	.reply_cmd		= ETHTOOL_MSG_PAUSE_GET_REPLY,
210 	.hdr_attr		= ETHTOOL_A_PAUSE_HEADER,
211 	.req_info_size		= sizeof(struct pause_req_info),
212 	.reply_data_size	= sizeof(struct pause_reply_data),
213 
214 	.parse_request		= pause_parse_request,
215 	.prepare_data		= pause_prepare_data,
216 	.reply_size		= pause_reply_size,
217 	.fill_reply		= pause_fill_reply,
218 
219 	.set_validate		= ethnl_set_pause_validate,
220 	.set			= ethnl_set_pause,
221 	.set_ntf_cmd		= ETHTOOL_MSG_PAUSE_NTF,
222 };
223