1 // SPDX-License-Identifier: GPL-2.0-only 2 3 #include "netlink.h" 4 #include "common.h" 5 #include "bitset.h" 6 7 /* LINKMODES_GET */ 8 9 struct linkmodes_req_info { 10 struct ethnl_req_info base; 11 }; 12 13 struct linkmodes_reply_data { 14 struct ethnl_reply_data base; 15 struct ethtool_link_ksettings ksettings; 16 struct ethtool_link_settings *lsettings; 17 bool peer_empty; 18 }; 19 20 #define LINKMODES_REPDATA(__reply_base) \ 21 container_of(__reply_base, struct linkmodes_reply_data, base) 22 23 const struct nla_policy ethnl_linkmodes_get_policy[] = { 24 [ETHTOOL_A_LINKMODES_HEADER] = 25 NLA_POLICY_NESTED(ethnl_header_policy), 26 }; 27 28 static int linkmodes_prepare_data(const struct ethnl_req_info *req_base, 29 struct ethnl_reply_data *reply_base, 30 struct genl_info *info) 31 { 32 struct linkmodes_reply_data *data = LINKMODES_REPDATA(reply_base); 33 struct net_device *dev = reply_base->dev; 34 int ret; 35 36 data->lsettings = &data->ksettings.base; 37 38 ret = ethnl_ops_begin(dev); 39 if (ret < 0) 40 return ret; 41 42 ret = __ethtool_get_link_ksettings(dev, &data->ksettings); 43 if (ret < 0 && info) { 44 GENL_SET_ERR_MSG(info, "failed to retrieve link settings"); 45 goto out; 46 } 47 48 if (!dev->ethtool_ops->cap_link_lanes_supported) 49 data->ksettings.lanes = 0; 50 51 data->peer_empty = 52 bitmap_empty(data->ksettings.link_modes.lp_advertising, 53 __ETHTOOL_LINK_MODE_MASK_NBITS); 54 55 out: 56 ethnl_ops_complete(dev); 57 return ret; 58 } 59 60 static int linkmodes_reply_size(const struct ethnl_req_info *req_base, 61 const struct ethnl_reply_data *reply_base) 62 { 63 const struct linkmodes_reply_data *data = LINKMODES_REPDATA(reply_base); 64 const struct ethtool_link_ksettings *ksettings = &data->ksettings; 65 const struct ethtool_link_settings *lsettings = &ksettings->base; 66 bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS; 67 int len, ret; 68 69 len = nla_total_size(sizeof(u8)) /* LINKMODES_AUTONEG */ 70 + nla_total_size(sizeof(u32)) /* LINKMODES_SPEED */ 71 + nla_total_size(sizeof(u32)) /* LINKMODES_LANES */ 72 + nla_total_size(sizeof(u8)) /* LINKMODES_DUPLEX */ 73 + 0; 74 ret = ethnl_bitset_size(ksettings->link_modes.advertising, 75 ksettings->link_modes.supported, 76 __ETHTOOL_LINK_MODE_MASK_NBITS, 77 link_mode_names, compact); 78 if (ret < 0) 79 return ret; 80 len += ret; 81 if (!data->peer_empty) { 82 ret = ethnl_bitset_size(ksettings->link_modes.lp_advertising, 83 NULL, __ETHTOOL_LINK_MODE_MASK_NBITS, 84 link_mode_names, compact); 85 if (ret < 0) 86 return ret; 87 len += ret; 88 } 89 90 if (lsettings->master_slave_cfg != MASTER_SLAVE_CFG_UNSUPPORTED) 91 len += nla_total_size(sizeof(u8)); 92 93 if (lsettings->master_slave_state != MASTER_SLAVE_STATE_UNSUPPORTED) 94 len += nla_total_size(sizeof(u8)); 95 96 return len; 97 } 98 99 static int linkmodes_fill_reply(struct sk_buff *skb, 100 const struct ethnl_req_info *req_base, 101 const struct ethnl_reply_data *reply_base) 102 { 103 const struct linkmodes_reply_data *data = LINKMODES_REPDATA(reply_base); 104 const struct ethtool_link_ksettings *ksettings = &data->ksettings; 105 const struct ethtool_link_settings *lsettings = &ksettings->base; 106 bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS; 107 int ret; 108 109 if (nla_put_u8(skb, ETHTOOL_A_LINKMODES_AUTONEG, lsettings->autoneg)) 110 return -EMSGSIZE; 111 112 ret = ethnl_put_bitset(skb, ETHTOOL_A_LINKMODES_OURS, 113 ksettings->link_modes.advertising, 114 ksettings->link_modes.supported, 115 __ETHTOOL_LINK_MODE_MASK_NBITS, link_mode_names, 116 compact); 117 if (ret < 0) 118 return -EMSGSIZE; 119 if (!data->peer_empty) { 120 ret = ethnl_put_bitset(skb, ETHTOOL_A_LINKMODES_PEER, 121 ksettings->link_modes.lp_advertising, 122 NULL, __ETHTOOL_LINK_MODE_MASK_NBITS, 123 link_mode_names, compact); 124 if (ret < 0) 125 return -EMSGSIZE; 126 } 127 128 if (nla_put_u32(skb, ETHTOOL_A_LINKMODES_SPEED, lsettings->speed) || 129 nla_put_u8(skb, ETHTOOL_A_LINKMODES_DUPLEX, lsettings->duplex)) 130 return -EMSGSIZE; 131 132 if (ksettings->lanes && 133 nla_put_u32(skb, ETHTOOL_A_LINKMODES_LANES, ksettings->lanes)) 134 return -EMSGSIZE; 135 136 if (lsettings->master_slave_cfg != MASTER_SLAVE_CFG_UNSUPPORTED && 137 nla_put_u8(skb, ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG, 138 lsettings->master_slave_cfg)) 139 return -EMSGSIZE; 140 141 if (lsettings->master_slave_state != MASTER_SLAVE_STATE_UNSUPPORTED && 142 nla_put_u8(skb, ETHTOOL_A_LINKMODES_MASTER_SLAVE_STATE, 143 lsettings->master_slave_state)) 144 return -EMSGSIZE; 145 146 return 0; 147 } 148 149 const struct ethnl_request_ops ethnl_linkmodes_request_ops = { 150 .request_cmd = ETHTOOL_MSG_LINKMODES_GET, 151 .reply_cmd = ETHTOOL_MSG_LINKMODES_GET_REPLY, 152 .hdr_attr = ETHTOOL_A_LINKMODES_HEADER, 153 .req_info_size = sizeof(struct linkmodes_req_info), 154 .reply_data_size = sizeof(struct linkmodes_reply_data), 155 156 .prepare_data = linkmodes_prepare_data, 157 .reply_size = linkmodes_reply_size, 158 .fill_reply = linkmodes_fill_reply, 159 }; 160 161 /* LINKMODES_SET */ 162 163 const struct nla_policy ethnl_linkmodes_set_policy[] = { 164 [ETHTOOL_A_LINKMODES_HEADER] = 165 NLA_POLICY_NESTED(ethnl_header_policy), 166 [ETHTOOL_A_LINKMODES_AUTONEG] = { .type = NLA_U8 }, 167 [ETHTOOL_A_LINKMODES_OURS] = { .type = NLA_NESTED }, 168 [ETHTOOL_A_LINKMODES_SPEED] = { .type = NLA_U32 }, 169 [ETHTOOL_A_LINKMODES_DUPLEX] = { .type = NLA_U8 }, 170 [ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG] = { .type = NLA_U8 }, 171 [ETHTOOL_A_LINKMODES_LANES] = NLA_POLICY_RANGE(NLA_U32, 1, 8), 172 }; 173 174 /* Set advertised link modes to all supported modes matching requested speed, 175 * lanes and duplex values. Called when autonegotiation is on, speed, lanes or 176 * duplex is requested but no link mode change. This is done in userspace with 177 * ioctl() interface, move it into kernel for netlink. 178 * Returns true if advertised modes bitmap was modified. 179 */ 180 static bool ethnl_auto_linkmodes(struct ethtool_link_ksettings *ksettings, 181 bool req_speed, bool req_lanes, bool req_duplex) 182 { 183 unsigned long *advertising = ksettings->link_modes.advertising; 184 unsigned long *supported = ksettings->link_modes.supported; 185 DECLARE_BITMAP(old_adv, __ETHTOOL_LINK_MODE_MASK_NBITS); 186 unsigned int i; 187 188 bitmap_copy(old_adv, advertising, __ETHTOOL_LINK_MODE_MASK_NBITS); 189 190 for (i = 0; i < __ETHTOOL_LINK_MODE_MASK_NBITS; i++) { 191 const struct link_mode_info *info = &link_mode_params[i]; 192 193 if (info->speed == SPEED_UNKNOWN) 194 continue; 195 if (test_bit(i, supported) && 196 (!req_speed || info->speed == ksettings->base.speed) && 197 (!req_lanes || info->lanes == ksettings->lanes) && 198 (!req_duplex || info->duplex == ksettings->base.duplex)) 199 set_bit(i, advertising); 200 else 201 clear_bit(i, advertising); 202 } 203 204 return !bitmap_equal(old_adv, advertising, 205 __ETHTOOL_LINK_MODE_MASK_NBITS); 206 } 207 208 static bool ethnl_validate_master_slave_cfg(u8 cfg) 209 { 210 switch (cfg) { 211 case MASTER_SLAVE_CFG_MASTER_PREFERRED: 212 case MASTER_SLAVE_CFG_SLAVE_PREFERRED: 213 case MASTER_SLAVE_CFG_MASTER_FORCE: 214 case MASTER_SLAVE_CFG_SLAVE_FORCE: 215 return true; 216 } 217 218 return false; 219 } 220 221 static int ethnl_check_linkmodes(struct genl_info *info, struct nlattr **tb) 222 { 223 const struct nlattr *master_slave_cfg, *lanes_cfg; 224 225 master_slave_cfg = tb[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG]; 226 if (master_slave_cfg && 227 !ethnl_validate_master_slave_cfg(nla_get_u8(master_slave_cfg))) { 228 NL_SET_ERR_MSG_ATTR(info->extack, master_slave_cfg, 229 "master/slave value is invalid"); 230 return -EOPNOTSUPP; 231 } 232 233 lanes_cfg = tb[ETHTOOL_A_LINKMODES_LANES]; 234 if (lanes_cfg && !is_power_of_2(nla_get_u32(lanes_cfg))) { 235 NL_SET_ERR_MSG_ATTR(info->extack, lanes_cfg, 236 "lanes value is invalid"); 237 return -EINVAL; 238 } 239 240 return 0; 241 } 242 243 static int ethnl_update_linkmodes(struct genl_info *info, struct nlattr **tb, 244 struct ethtool_link_ksettings *ksettings, 245 bool *mod, const struct net_device *dev) 246 { 247 struct ethtool_link_settings *lsettings = &ksettings->base; 248 bool req_speed, req_lanes, req_duplex; 249 const struct nlattr *master_slave_cfg, *lanes_cfg; 250 int ret; 251 252 master_slave_cfg = tb[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG]; 253 if (master_slave_cfg) { 254 if (lsettings->master_slave_cfg == MASTER_SLAVE_CFG_UNSUPPORTED) { 255 NL_SET_ERR_MSG_ATTR(info->extack, master_slave_cfg, 256 "master/slave configuration not supported by device"); 257 return -EOPNOTSUPP; 258 } 259 } 260 261 *mod = false; 262 req_speed = tb[ETHTOOL_A_LINKMODES_SPEED]; 263 req_lanes = tb[ETHTOOL_A_LINKMODES_LANES]; 264 req_duplex = tb[ETHTOOL_A_LINKMODES_DUPLEX]; 265 266 ethnl_update_u8(&lsettings->autoneg, tb[ETHTOOL_A_LINKMODES_AUTONEG], 267 mod); 268 269 lanes_cfg = tb[ETHTOOL_A_LINKMODES_LANES]; 270 if (lanes_cfg) { 271 /* If autoneg is off and lanes parameter is not supported by the 272 * driver, return an error. 273 */ 274 if (!lsettings->autoneg && 275 !dev->ethtool_ops->cap_link_lanes_supported) { 276 NL_SET_ERR_MSG_ATTR(info->extack, lanes_cfg, 277 "lanes configuration not supported by device"); 278 return -EOPNOTSUPP; 279 } 280 } else if (!lsettings->autoneg) { 281 /* If autoneg is off and lanes parameter is not passed from user, 282 * set the lanes parameter to 0. 283 */ 284 ksettings->lanes = 0; 285 } 286 287 ret = ethnl_update_bitset(ksettings->link_modes.advertising, 288 __ETHTOOL_LINK_MODE_MASK_NBITS, 289 tb[ETHTOOL_A_LINKMODES_OURS], link_mode_names, 290 info->extack, mod); 291 if (ret < 0) 292 return ret; 293 ethnl_update_u32(&lsettings->speed, tb[ETHTOOL_A_LINKMODES_SPEED], 294 mod); 295 ethnl_update_u32(&ksettings->lanes, lanes_cfg, mod); 296 ethnl_update_u8(&lsettings->duplex, tb[ETHTOOL_A_LINKMODES_DUPLEX], 297 mod); 298 ethnl_update_u8(&lsettings->master_slave_cfg, master_slave_cfg, mod); 299 300 if (!tb[ETHTOOL_A_LINKMODES_OURS] && lsettings->autoneg && 301 (req_speed || req_lanes || req_duplex) && 302 ethnl_auto_linkmodes(ksettings, req_speed, req_lanes, req_duplex)) 303 *mod = true; 304 305 return 0; 306 } 307 308 int ethnl_set_linkmodes(struct sk_buff *skb, struct genl_info *info) 309 { 310 struct ethtool_link_ksettings ksettings = {}; 311 struct ethnl_req_info req_info = {}; 312 struct nlattr **tb = info->attrs; 313 struct net_device *dev; 314 bool mod = false; 315 int ret; 316 317 ret = ethnl_check_linkmodes(info, tb); 318 if (ret < 0) 319 return ret; 320 321 ret = ethnl_parse_header_dev_get(&req_info, 322 tb[ETHTOOL_A_LINKMODES_HEADER], 323 genl_info_net(info), info->extack, 324 true); 325 if (ret < 0) 326 return ret; 327 dev = req_info.dev; 328 ret = -EOPNOTSUPP; 329 if (!dev->ethtool_ops->get_link_ksettings || 330 !dev->ethtool_ops->set_link_ksettings) 331 goto out_dev; 332 333 rtnl_lock(); 334 ret = ethnl_ops_begin(dev); 335 if (ret < 0) 336 goto out_rtnl; 337 338 ret = __ethtool_get_link_ksettings(dev, &ksettings); 339 if (ret < 0) { 340 GENL_SET_ERR_MSG(info, "failed to retrieve link settings"); 341 goto out_ops; 342 } 343 344 ret = ethnl_update_linkmodes(info, tb, &ksettings, &mod, dev); 345 if (ret < 0) 346 goto out_ops; 347 348 if (mod) { 349 ret = dev->ethtool_ops->set_link_ksettings(dev, &ksettings); 350 if (ret < 0) 351 GENL_SET_ERR_MSG(info, "link settings update failed"); 352 else 353 ethtool_notify(dev, ETHTOOL_MSG_LINKMODES_NTF, NULL); 354 } 355 356 out_ops: 357 ethnl_ops_complete(dev); 358 out_rtnl: 359 rtnl_unlock(); 360 out_dev: 361 ethnl_parse_header_dev_put(&req_info); 362 return ret; 363 } 364