1// SPDX-License-Identifier: GPL-2.0-only
2
3#include <net/xdp_sock_drv.h>
4
5#include "netlink.h"
6#include "common.h"
7
8struct channels_req_info {
9 struct ethnl_req_info base;
10};
11
12struct channels_reply_data {
13 struct ethnl_reply_data base;
14 struct ethtool_channels channels;
15};
16
17#define CHANNELS_REPDATA(__reply_base) \
18 container_of(__reply_base, struct channels_reply_data, base)
19
20const struct nla_policy ethnl_channels_get_policy[] = {
21 [ETHTOOL_A_CHANNELS_HEADER] =
22 NLA_POLICY_NESTED(ethnl_header_policy),
23};
24
25static int channels_prepare_data(const struct ethnl_req_info *req_base,
26 struct ethnl_reply_data *reply_base,
27 const struct genl_info *info)
28{
29 struct channels_reply_data *data = CHANNELS_REPDATA(reply_base);
30 struct net_device *dev = reply_base->dev;
31 int ret;
32
33 if (!dev->ethtool_ops->get_channels)
34 return -EOPNOTSUPP;
35 ret = ethnl_ops_begin(dev);
36 if (ret < 0)
37 return ret;
38 dev->ethtool_ops->get_channels(dev, &data->channels);
39 ethnl_ops_complete(dev);
40
41 return 0;
42}
43
44static int channels_reply_size(const struct ethnl_req_info *req_base,
45 const struct ethnl_reply_data *reply_base)
46{
47 return nla_total_size(payload: sizeof(u32)) + /* _CHANNELS_RX_MAX */
48 nla_total_size(payload: sizeof(u32)) + /* _CHANNELS_TX_MAX */
49 nla_total_size(payload: sizeof(u32)) + /* _CHANNELS_OTHER_MAX */
50 nla_total_size(payload: sizeof(u32)) + /* _CHANNELS_COMBINED_MAX */
51 nla_total_size(payload: sizeof(u32)) + /* _CHANNELS_RX_COUNT */
52 nla_total_size(payload: sizeof(u32)) + /* _CHANNELS_TX_COUNT */
53 nla_total_size(payload: sizeof(u32)) + /* _CHANNELS_OTHER_COUNT */
54 nla_total_size(payload: sizeof(u32)); /* _CHANNELS_COMBINED_COUNT */
55}
56
57static int channels_fill_reply(struct sk_buff *skb,
58 const struct ethnl_req_info *req_base,
59 const struct ethnl_reply_data *reply_base)
60{
61 const struct channels_reply_data *data = CHANNELS_REPDATA(reply_base);
62 const struct ethtool_channels *channels = &data->channels;
63
64 if ((channels->max_rx &&
65 (nla_put_u32(skb, attrtype: ETHTOOL_A_CHANNELS_RX_MAX,
66 value: channels->max_rx) ||
67 nla_put_u32(skb, attrtype: ETHTOOL_A_CHANNELS_RX_COUNT,
68 value: channels->rx_count))) ||
69 (channels->max_tx &&
70 (nla_put_u32(skb, attrtype: ETHTOOL_A_CHANNELS_TX_MAX,
71 value: channels->max_tx) ||
72 nla_put_u32(skb, attrtype: ETHTOOL_A_CHANNELS_TX_COUNT,
73 value: channels->tx_count))) ||
74 (channels->max_other &&
75 (nla_put_u32(skb, attrtype: ETHTOOL_A_CHANNELS_OTHER_MAX,
76 value: channels->max_other) ||
77 nla_put_u32(skb, attrtype: ETHTOOL_A_CHANNELS_OTHER_COUNT,
78 value: channels->other_count))) ||
79 (channels->max_combined &&
80 (nla_put_u32(skb, attrtype: ETHTOOL_A_CHANNELS_COMBINED_MAX,
81 value: channels->max_combined) ||
82 nla_put_u32(skb, attrtype: ETHTOOL_A_CHANNELS_COMBINED_COUNT,
83 value: channels->combined_count))))
84 return -EMSGSIZE;
85
86 return 0;
87}
88
89/* CHANNELS_SET */
90
91const struct nla_policy ethnl_channels_set_policy[] = {
92 [ETHTOOL_A_CHANNELS_HEADER] =
93 NLA_POLICY_NESTED(ethnl_header_policy),
94 [ETHTOOL_A_CHANNELS_RX_COUNT] = { .type = NLA_U32 },
95 [ETHTOOL_A_CHANNELS_TX_COUNT] = { .type = NLA_U32 },
96 [ETHTOOL_A_CHANNELS_OTHER_COUNT] = { .type = NLA_U32 },
97 [ETHTOOL_A_CHANNELS_COMBINED_COUNT] = { .type = NLA_U32 },
98};
99
100static int
101ethnl_set_channels_validate(struct ethnl_req_info *req_info,
102 struct genl_info *info)
103{
104 const struct ethtool_ops *ops = req_info->dev->ethtool_ops;
105
106 return ops->get_channels && ops->set_channels ? 1 : -EOPNOTSUPP;
107}
108
109static int
110ethnl_set_channels(struct ethnl_req_info *req_info, struct genl_info *info)
111{
112 unsigned int from_channel, old_total, i;
113 bool mod = false, mod_combined = false;
114 struct net_device *dev = req_info->dev;
115 struct ethtool_channels channels = {};
116 struct nlattr **tb = info->attrs;
117 u32 err_attr;
118 int ret;
119
120 dev->ethtool_ops->get_channels(dev, &channels);
121 old_total = channels.combined_count +
122 max(channels.rx_count, channels.tx_count);
123
124 ethnl_update_u32(dst: &channels.rx_count, attr: tb[ETHTOOL_A_CHANNELS_RX_COUNT],
125 mod: &mod);
126 ethnl_update_u32(dst: &channels.tx_count, attr: tb[ETHTOOL_A_CHANNELS_TX_COUNT],
127 mod: &mod);
128 ethnl_update_u32(dst: &channels.other_count,
129 attr: tb[ETHTOOL_A_CHANNELS_OTHER_COUNT], mod: &mod);
130 ethnl_update_u32(dst: &channels.combined_count,
131 attr: tb[ETHTOOL_A_CHANNELS_COMBINED_COUNT], mod: &mod_combined);
132 mod |= mod_combined;
133 if (!mod)
134 return 0;
135
136 /* ensure new channel counts are within limits */
137 if (channels.rx_count > channels.max_rx)
138 err_attr = ETHTOOL_A_CHANNELS_RX_COUNT;
139 else if (channels.tx_count > channels.max_tx)
140 err_attr = ETHTOOL_A_CHANNELS_TX_COUNT;
141 else if (channels.other_count > channels.max_other)
142 err_attr = ETHTOOL_A_CHANNELS_OTHER_COUNT;
143 else if (channels.combined_count > channels.max_combined)
144 err_attr = ETHTOOL_A_CHANNELS_COMBINED_COUNT;
145 else
146 err_attr = 0;
147 if (err_attr) {
148 NL_SET_ERR_MSG_ATTR(info->extack, tb[err_attr],
149 "requested channel count exceeds maximum");
150 return -EINVAL;
151 }
152
153 /* ensure there is at least one RX and one TX channel */
154 if (!channels.combined_count && !channels.rx_count)
155 err_attr = ETHTOOL_A_CHANNELS_RX_COUNT;
156 else if (!channels.combined_count && !channels.tx_count)
157 err_attr = ETHTOOL_A_CHANNELS_TX_COUNT;
158 else
159 err_attr = 0;
160 if (err_attr) {
161 if (mod_combined)
162 err_attr = ETHTOOL_A_CHANNELS_COMBINED_COUNT;
163 NL_SET_ERR_MSG_ATTR(info->extack, tb[err_attr],
164 "requested channel counts would result in no RX or TX channel being configured");
165 return -EINVAL;
166 }
167
168 ret = ethtool_check_max_channel(dev, channels, info);
169 if (ret)
170 return ret;
171
172 /* Disabling channels, query zero-copy AF_XDP sockets */
173 from_channel = channels.combined_count +
174 min(channels.rx_count, channels.tx_count);
175 for (i = from_channel; i < old_total; i++)
176 if (xsk_get_pool_from_qid(dev, queue_id: i)) {
177 GENL_SET_ERR_MSG(info, "requested channel counts are too low for existing zerocopy AF_XDP sockets");
178 return -EINVAL;
179 }
180
181 ret = dev->ethtool_ops->set_channels(dev, &channels);
182 return ret < 0 ? ret : 1;
183}
184
185const struct ethnl_request_ops ethnl_channels_request_ops = {
186 .request_cmd = ETHTOOL_MSG_CHANNELS_GET,
187 .reply_cmd = ETHTOOL_MSG_CHANNELS_GET_REPLY,
188 .hdr_attr = ETHTOOL_A_CHANNELS_HEADER,
189 .req_info_size = sizeof(struct channels_req_info),
190 .reply_data_size = sizeof(struct channels_reply_data),
191
192 .prepare_data = channels_prepare_data,
193 .reply_size = channels_reply_size,
194 .fill_reply = channels_fill_reply,
195
196 .set_validate = ethnl_set_channels_validate,
197 .set = ethnl_set_channels,
198 .set_ntf_cmd = ETHTOOL_MSG_CHANNELS_NTF,
199};
200

source code of linux/net/ethtool/channels.c