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