1// SPDX-License-Identifier: GPL-2.0-only
2
3#include <net/netdev_queues.h>
4
5#include "netlink.h"
6#include "common.h"
7
8struct rings_req_info {
9 struct ethnl_req_info base;
10};
11
12struct rings_reply_data {
13 struct ethnl_reply_data base;
14 struct ethtool_ringparam ringparam;
15 struct kernel_ethtool_ringparam kernel_ringparam;
16 u32 supported_ring_params;
17};
18
19#define RINGS_REPDATA(__reply_base) \
20 container_of(__reply_base, struct rings_reply_data, base)
21
22const struct nla_policy ethnl_rings_get_policy[] = {
23 [ETHTOOL_A_RINGS_HEADER] =
24 NLA_POLICY_NESTED(ethnl_header_policy),
25};
26
27static int rings_prepare_data(const struct ethnl_req_info *req_base,
28 struct ethnl_reply_data *reply_base,
29 const struct genl_info *info)
30{
31 struct rings_reply_data *data = RINGS_REPDATA(reply_base);
32 struct net_device *dev = reply_base->dev;
33 int ret;
34
35 if (!dev->ethtool_ops->get_ringparam)
36 return -EOPNOTSUPP;
37
38 data->supported_ring_params = dev->ethtool_ops->supported_ring_params;
39 ret = ethnl_ops_begin(dev);
40 if (ret < 0)
41 return ret;
42
43 data->kernel_ringparam.tcp_data_split = dev->cfg->hds_config;
44 data->kernel_ringparam.hds_thresh = dev->cfg->hds_thresh;
45
46 dev->ethtool_ops->get_ringparam(dev, &data->ringparam,
47 &data->kernel_ringparam, info->extack);
48 ethnl_ops_complete(dev);
49
50 return 0;
51}
52
53static int rings_reply_size(const struct ethnl_req_info *req_base,
54 const struct ethnl_reply_data *reply_base)
55{
56 return nla_total_size(payload: sizeof(u32)) + /* _RINGS_RX_MAX */
57 nla_total_size(payload: sizeof(u32)) + /* _RINGS_RX_MINI_MAX */
58 nla_total_size(payload: sizeof(u32)) + /* _RINGS_RX_JUMBO_MAX */
59 nla_total_size(payload: sizeof(u32)) + /* _RINGS_TX_MAX */
60 nla_total_size(payload: sizeof(u32)) + /* _RINGS_RX */
61 nla_total_size(payload: sizeof(u32)) + /* _RINGS_RX_MINI */
62 nla_total_size(payload: sizeof(u32)) + /* _RINGS_RX_JUMBO */
63 nla_total_size(payload: sizeof(u32)) + /* _RINGS_TX */
64 nla_total_size(payload: sizeof(u32)) + /* _RINGS_RX_BUF_LEN */
65 nla_total_size(payload: sizeof(u8)) + /* _RINGS_TCP_DATA_SPLIT */
66 nla_total_size(payload: sizeof(u32) + /* _RINGS_CQE_SIZE */
67 nla_total_size(payload: sizeof(u8)) + /* _RINGS_TX_PUSH */
68 nla_total_size(payload: sizeof(u8))) + /* _RINGS_RX_PUSH */
69 nla_total_size(payload: sizeof(u32)) + /* _RINGS_TX_PUSH_BUF_LEN */
70 nla_total_size(payload: sizeof(u32)) + /* _RINGS_TX_PUSH_BUF_LEN_MAX */
71 nla_total_size(payload: sizeof(u32)) + /* _RINGS_HDS_THRESH */
72 nla_total_size(payload: sizeof(u32)); /* _RINGS_HDS_THRESH_MAX*/
73}
74
75static int rings_fill_reply(struct sk_buff *skb,
76 const struct ethnl_req_info *req_base,
77 const struct ethnl_reply_data *reply_base)
78{
79 const struct rings_reply_data *data = RINGS_REPDATA(reply_base);
80 const struct kernel_ethtool_ringparam *kr = &data->kernel_ringparam;
81 const struct ethtool_ringparam *ringparam = &data->ringparam;
82 u32 supported_ring_params = data->supported_ring_params;
83
84 WARN_ON(kr->tcp_data_split > ETHTOOL_TCP_DATA_SPLIT_ENABLED);
85
86 if ((ringparam->rx_max_pending &&
87 (nla_put_u32(skb, attrtype: ETHTOOL_A_RINGS_RX_MAX,
88 value: ringparam->rx_max_pending) ||
89 nla_put_u32(skb, attrtype: ETHTOOL_A_RINGS_RX,
90 value: ringparam->rx_pending))) ||
91 (ringparam->rx_mini_max_pending &&
92 (nla_put_u32(skb, attrtype: ETHTOOL_A_RINGS_RX_MINI_MAX,
93 value: ringparam->rx_mini_max_pending) ||
94 nla_put_u32(skb, attrtype: ETHTOOL_A_RINGS_RX_MINI,
95 value: ringparam->rx_mini_pending))) ||
96 (ringparam->rx_jumbo_max_pending &&
97 (nla_put_u32(skb, attrtype: ETHTOOL_A_RINGS_RX_JUMBO_MAX,
98 value: ringparam->rx_jumbo_max_pending) ||
99 nla_put_u32(skb, attrtype: ETHTOOL_A_RINGS_RX_JUMBO,
100 value: ringparam->rx_jumbo_pending))) ||
101 (ringparam->tx_max_pending &&
102 (nla_put_u32(skb, attrtype: ETHTOOL_A_RINGS_TX_MAX,
103 value: ringparam->tx_max_pending) ||
104 nla_put_u32(skb, attrtype: ETHTOOL_A_RINGS_TX,
105 value: ringparam->tx_pending))) ||
106 (kr->rx_buf_len &&
107 (nla_put_u32(skb, attrtype: ETHTOOL_A_RINGS_RX_BUF_LEN, value: kr->rx_buf_len))) ||
108 (kr->tcp_data_split &&
109 (nla_put_u8(skb, attrtype: ETHTOOL_A_RINGS_TCP_DATA_SPLIT,
110 value: kr->tcp_data_split))) ||
111 (kr->cqe_size &&
112 (nla_put_u32(skb, attrtype: ETHTOOL_A_RINGS_CQE_SIZE, value: kr->cqe_size))) ||
113 nla_put_u8(skb, attrtype: ETHTOOL_A_RINGS_TX_PUSH, value: !!kr->tx_push) ||
114 nla_put_u8(skb, attrtype: ETHTOOL_A_RINGS_RX_PUSH, value: !!kr->rx_push) ||
115 ((supported_ring_params & ETHTOOL_RING_USE_TX_PUSH_BUF_LEN) &&
116 (nla_put_u32(skb, attrtype: ETHTOOL_A_RINGS_TX_PUSH_BUF_LEN_MAX,
117 value: kr->tx_push_buf_max_len) ||
118 nla_put_u32(skb, attrtype: ETHTOOL_A_RINGS_TX_PUSH_BUF_LEN,
119 value: kr->tx_push_buf_len))) ||
120 ((supported_ring_params & ETHTOOL_RING_USE_HDS_THRS) &&
121 (nla_put_u32(skb, attrtype: ETHTOOL_A_RINGS_HDS_THRESH,
122 value: kr->hds_thresh) ||
123 nla_put_u32(skb, attrtype: ETHTOOL_A_RINGS_HDS_THRESH_MAX,
124 value: kr->hds_thresh_max))))
125 return -EMSGSIZE;
126
127 return 0;
128}
129
130/* RINGS_SET */
131
132const struct nla_policy ethnl_rings_set_policy[] = {
133 [ETHTOOL_A_RINGS_HEADER] =
134 NLA_POLICY_NESTED(ethnl_header_policy),
135 [ETHTOOL_A_RINGS_RX] = { .type = NLA_U32 },
136 [ETHTOOL_A_RINGS_RX_MINI] = { .type = NLA_U32 },
137 [ETHTOOL_A_RINGS_RX_JUMBO] = { .type = NLA_U32 },
138 [ETHTOOL_A_RINGS_TX] = { .type = NLA_U32 },
139 [ETHTOOL_A_RINGS_RX_BUF_LEN] = NLA_POLICY_MIN(NLA_U32, 1),
140 [ETHTOOL_A_RINGS_TCP_DATA_SPLIT] =
141 NLA_POLICY_MAX(NLA_U8, ETHTOOL_TCP_DATA_SPLIT_ENABLED),
142 [ETHTOOL_A_RINGS_CQE_SIZE] = NLA_POLICY_MIN(NLA_U32, 1),
143 [ETHTOOL_A_RINGS_TX_PUSH] = NLA_POLICY_MAX(NLA_U8, 1),
144 [ETHTOOL_A_RINGS_RX_PUSH] = NLA_POLICY_MAX(NLA_U8, 1),
145 [ETHTOOL_A_RINGS_TX_PUSH_BUF_LEN] = { .type = NLA_U32 },
146 [ETHTOOL_A_RINGS_HDS_THRESH] = { .type = NLA_U32 },
147};
148
149static int
150ethnl_set_rings_validate(struct ethnl_req_info *req_info,
151 struct genl_info *info)
152{
153 const struct ethtool_ops *ops = req_info->dev->ethtool_ops;
154 struct nlattr **tb = info->attrs;
155
156 if (tb[ETHTOOL_A_RINGS_RX_BUF_LEN] &&
157 !(ops->supported_ring_params & ETHTOOL_RING_USE_RX_BUF_LEN)) {
158 NL_SET_ERR_MSG_ATTR(info->extack,
159 tb[ETHTOOL_A_RINGS_RX_BUF_LEN],
160 "setting rx buf len not supported");
161 return -EOPNOTSUPP;
162 }
163
164 if (tb[ETHTOOL_A_RINGS_TCP_DATA_SPLIT] &&
165 !(ops->supported_ring_params & ETHTOOL_RING_USE_TCP_DATA_SPLIT)) {
166 NL_SET_ERR_MSG_ATTR(info->extack,
167 tb[ETHTOOL_A_RINGS_TCP_DATA_SPLIT],
168 "setting TCP data split is not supported");
169 return -EOPNOTSUPP;
170 }
171
172 if (tb[ETHTOOL_A_RINGS_HDS_THRESH] &&
173 !(ops->supported_ring_params & ETHTOOL_RING_USE_HDS_THRS)) {
174 NL_SET_ERR_MSG_ATTR(info->extack,
175 tb[ETHTOOL_A_RINGS_HDS_THRESH],
176 "setting hds-thresh is not supported");
177 return -EOPNOTSUPP;
178 }
179
180 if (tb[ETHTOOL_A_RINGS_CQE_SIZE] &&
181 !(ops->supported_ring_params & ETHTOOL_RING_USE_CQE_SIZE)) {
182 NL_SET_ERR_MSG_ATTR(info->extack,
183 tb[ETHTOOL_A_RINGS_CQE_SIZE],
184 "setting cqe size not supported");
185 return -EOPNOTSUPP;
186 }
187
188 if (tb[ETHTOOL_A_RINGS_TX_PUSH] &&
189 !(ops->supported_ring_params & ETHTOOL_RING_USE_TX_PUSH)) {
190 NL_SET_ERR_MSG_ATTR(info->extack,
191 tb[ETHTOOL_A_RINGS_TX_PUSH],
192 "setting tx push not supported");
193 return -EOPNOTSUPP;
194 }
195
196 if (tb[ETHTOOL_A_RINGS_RX_PUSH] &&
197 !(ops->supported_ring_params & ETHTOOL_RING_USE_RX_PUSH)) {
198 NL_SET_ERR_MSG_ATTR(info->extack,
199 tb[ETHTOOL_A_RINGS_RX_PUSH],
200 "setting rx push not supported");
201 return -EOPNOTSUPP;
202 }
203
204 if (tb[ETHTOOL_A_RINGS_TX_PUSH_BUF_LEN] &&
205 !(ops->supported_ring_params & ETHTOOL_RING_USE_TX_PUSH_BUF_LEN)) {
206 NL_SET_ERR_MSG_ATTR(info->extack,
207 tb[ETHTOOL_A_RINGS_TX_PUSH_BUF_LEN],
208 "setting tx push buf len is not supported");
209 return -EOPNOTSUPP;
210 }
211
212 return ops->get_ringparam && ops->set_ringparam ? 1 : -EOPNOTSUPP;
213}
214
215static int
216ethnl_set_rings(struct ethnl_req_info *req_info, struct genl_info *info)
217{
218 struct kernel_ethtool_ringparam kernel_ringparam;
219 struct net_device *dev = req_info->dev;
220 struct ethtool_ringparam ringparam;
221 struct nlattr **tb = info->attrs;
222 const struct nlattr *err_attr;
223 bool mod = false;
224 int ret;
225
226 ethtool_ringparam_get_cfg(dev, param: &ringparam, kparam: &kernel_ringparam,
227 extack: info->extack);
228
229 ethnl_update_u32(dst: &ringparam.rx_pending, attr: tb[ETHTOOL_A_RINGS_RX], mod: &mod);
230 ethnl_update_u32(dst: &ringparam.rx_mini_pending,
231 attr: tb[ETHTOOL_A_RINGS_RX_MINI], mod: &mod);
232 ethnl_update_u32(dst: &ringparam.rx_jumbo_pending,
233 attr: tb[ETHTOOL_A_RINGS_RX_JUMBO], mod: &mod);
234 ethnl_update_u32(dst: &ringparam.tx_pending, attr: tb[ETHTOOL_A_RINGS_TX], mod: &mod);
235 ethnl_update_u32(dst: &kernel_ringparam.rx_buf_len,
236 attr: tb[ETHTOOL_A_RINGS_RX_BUF_LEN], mod: &mod);
237 ethnl_update_u8(dst: &kernel_ringparam.tcp_data_split,
238 attr: tb[ETHTOOL_A_RINGS_TCP_DATA_SPLIT], mod: &mod);
239 ethnl_update_u32(dst: &kernel_ringparam.cqe_size,
240 attr: tb[ETHTOOL_A_RINGS_CQE_SIZE], mod: &mod);
241 ethnl_update_u8(dst: &kernel_ringparam.tx_push,
242 attr: tb[ETHTOOL_A_RINGS_TX_PUSH], mod: &mod);
243 ethnl_update_u8(dst: &kernel_ringparam.rx_push,
244 attr: tb[ETHTOOL_A_RINGS_RX_PUSH], mod: &mod);
245 ethnl_update_u32(dst: &kernel_ringparam.tx_push_buf_len,
246 attr: tb[ETHTOOL_A_RINGS_TX_PUSH_BUF_LEN], mod: &mod);
247 ethnl_update_u32(dst: &kernel_ringparam.hds_thresh,
248 attr: tb[ETHTOOL_A_RINGS_HDS_THRESH], mod: &mod);
249 if (!mod)
250 return 0;
251
252 if (kernel_ringparam.tcp_data_split == ETHTOOL_TCP_DATA_SPLIT_ENABLED &&
253 dev_xdp_sb_prog_count(dev)) {
254 NL_SET_ERR_MSG_ATTR(info->extack,
255 tb[ETHTOOL_A_RINGS_TCP_DATA_SPLIT],
256 "tcp-data-split can not be enabled with single buffer XDP");
257 return -EINVAL;
258 }
259
260 if (dev_get_min_mp_channel_count(dev)) {
261 if (kernel_ringparam.tcp_data_split !=
262 ETHTOOL_TCP_DATA_SPLIT_ENABLED) {
263 NL_SET_ERR_MSG(info->extack,
264 "can't disable tcp-data-split while device has memory provider enabled");
265 return -EINVAL;
266 } else if (kernel_ringparam.hds_thresh) {
267 NL_SET_ERR_MSG(info->extack,
268 "can't set non-zero hds_thresh while device is memory provider enabled");
269 return -EINVAL;
270 }
271 }
272
273 /* ensure new ring parameters are within limits */
274 if (ringparam.rx_pending > ringparam.rx_max_pending)
275 err_attr = tb[ETHTOOL_A_RINGS_RX];
276 else if (ringparam.rx_mini_pending > ringparam.rx_mini_max_pending)
277 err_attr = tb[ETHTOOL_A_RINGS_RX_MINI];
278 else if (ringparam.rx_jumbo_pending > ringparam.rx_jumbo_max_pending)
279 err_attr = tb[ETHTOOL_A_RINGS_RX_JUMBO];
280 else if (ringparam.tx_pending > ringparam.tx_max_pending)
281 err_attr = tb[ETHTOOL_A_RINGS_TX];
282 else if (kernel_ringparam.hds_thresh > kernel_ringparam.hds_thresh_max)
283 err_attr = tb[ETHTOOL_A_RINGS_HDS_THRESH];
284 else
285 err_attr = NULL;
286 if (err_attr) {
287 NL_SET_ERR_MSG_ATTR(info->extack, err_attr,
288 "requested ring size exceeds maximum");
289 return -EINVAL;
290 }
291
292 if (kernel_ringparam.tx_push_buf_len > kernel_ringparam.tx_push_buf_max_len) {
293 NL_SET_ERR_MSG_ATTR_FMT(info->extack, tb[ETHTOOL_A_RINGS_TX_PUSH_BUF_LEN],
294 "Requested TX push buffer exceeds the maximum of %u",
295 kernel_ringparam.tx_push_buf_max_len);
296
297 return -EINVAL;
298 }
299
300 dev->cfg_pending->hds_config = kernel_ringparam.tcp_data_split;
301 dev->cfg_pending->hds_thresh = kernel_ringparam.hds_thresh;
302
303 ret = dev->ethtool_ops->set_ringparam(dev, &ringparam,
304 &kernel_ringparam, info->extack);
305 return ret < 0 ? ret : 1;
306}
307
308const struct ethnl_request_ops ethnl_rings_request_ops = {
309 .request_cmd = ETHTOOL_MSG_RINGS_GET,
310 .reply_cmd = ETHTOOL_MSG_RINGS_GET_REPLY,
311 .hdr_attr = ETHTOOL_A_RINGS_HEADER,
312 .req_info_size = sizeof(struct rings_req_info),
313 .reply_data_size = sizeof(struct rings_reply_data),
314
315 .prepare_data = rings_prepare_data,
316 .reply_size = rings_reply_size,
317 .fill_reply = rings_fill_reply,
318
319 .set_validate = ethnl_set_rings_validate,
320 .set = ethnl_set_rings,
321 .set_ntf_cmd = ETHTOOL_MSG_RINGS_NTF,
322};
323

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