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 const struct ethnl_request_ops ethnl_linkmodes_request_ops = { 155 .request_cmd = ETHTOOL_MSG_LINKMODES_GET, 156 .reply_cmd = ETHTOOL_MSG_LINKMODES_GET_REPLY, 157 .hdr_attr = ETHTOOL_A_LINKMODES_HEADER, 158 .req_info_size = sizeof(struct linkmodes_req_info), 159 .reply_data_size = sizeof(struct linkmodes_reply_data), 160 161 .prepare_data = linkmodes_prepare_data, 162 .reply_size = linkmodes_reply_size, 163 .fill_reply = linkmodes_fill_reply, 164 }; 165 166 /* LINKMODES_SET */ 167 168 const struct nla_policy ethnl_linkmodes_set_policy[] = { 169 [ETHTOOL_A_LINKMODES_HEADER] = 170 NLA_POLICY_NESTED(ethnl_header_policy), 171 [ETHTOOL_A_LINKMODES_AUTONEG] = { .type = NLA_U8 }, 172 [ETHTOOL_A_LINKMODES_OURS] = { .type = NLA_NESTED }, 173 [ETHTOOL_A_LINKMODES_SPEED] = { .type = NLA_U32 }, 174 [ETHTOOL_A_LINKMODES_DUPLEX] = { .type = NLA_U8 }, 175 [ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG] = { .type = NLA_U8 }, 176 [ETHTOOL_A_LINKMODES_LANES] = NLA_POLICY_RANGE(NLA_U32, 1, 8), 177 }; 178 179 /* Set advertised link modes to all supported modes matching requested speed, 180 * lanes and duplex values. Called when autonegotiation is on, speed, lanes or 181 * duplex is requested but no link mode change. This is done in userspace with 182 * ioctl() interface, move it into kernel for netlink. 183 * Returns true if advertised modes bitmap was modified. 184 */ 185 static bool ethnl_auto_linkmodes(struct ethtool_link_ksettings *ksettings, 186 bool req_speed, bool req_lanes, bool req_duplex) 187 { 188 unsigned long *advertising = ksettings->link_modes.advertising; 189 unsigned long *supported = ksettings->link_modes.supported; 190 DECLARE_BITMAP(old_adv, __ETHTOOL_LINK_MODE_MASK_NBITS); 191 unsigned int i; 192 193 bitmap_copy(old_adv, advertising, __ETHTOOL_LINK_MODE_MASK_NBITS); 194 195 for (i = 0; i < __ETHTOOL_LINK_MODE_MASK_NBITS; i++) { 196 const struct link_mode_info *info = &link_mode_params[i]; 197 198 if (info->speed == SPEED_UNKNOWN) 199 continue; 200 if (test_bit(i, supported) && 201 (!req_speed || info->speed == ksettings->base.speed) && 202 (!req_lanes || info->lanes == ksettings->lanes) && 203 (!req_duplex || info->duplex == ksettings->base.duplex)) 204 set_bit(i, advertising); 205 else 206 clear_bit(i, advertising); 207 } 208 209 return !bitmap_equal(old_adv, advertising, 210 __ETHTOOL_LINK_MODE_MASK_NBITS); 211 } 212 213 static bool ethnl_validate_master_slave_cfg(u8 cfg) 214 { 215 switch (cfg) { 216 case MASTER_SLAVE_CFG_MASTER_PREFERRED: 217 case MASTER_SLAVE_CFG_SLAVE_PREFERRED: 218 case MASTER_SLAVE_CFG_MASTER_FORCE: 219 case MASTER_SLAVE_CFG_SLAVE_FORCE: 220 return true; 221 } 222 223 return false; 224 } 225 226 static int ethnl_check_linkmodes(struct genl_info *info, struct nlattr **tb) 227 { 228 const struct nlattr *master_slave_cfg, *lanes_cfg; 229 230 master_slave_cfg = tb[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG]; 231 if (master_slave_cfg && 232 !ethnl_validate_master_slave_cfg(nla_get_u8(master_slave_cfg))) { 233 NL_SET_ERR_MSG_ATTR(info->extack, master_slave_cfg, 234 "master/slave value is invalid"); 235 return -EOPNOTSUPP; 236 } 237 238 lanes_cfg = tb[ETHTOOL_A_LINKMODES_LANES]; 239 if (lanes_cfg && !is_power_of_2(nla_get_u32(lanes_cfg))) { 240 NL_SET_ERR_MSG_ATTR(info->extack, lanes_cfg, 241 "lanes value is invalid"); 242 return -EINVAL; 243 } 244 245 return 0; 246 } 247 248 static int ethnl_update_linkmodes(struct genl_info *info, struct nlattr **tb, 249 struct ethtool_link_ksettings *ksettings, 250 bool *mod, const struct net_device *dev) 251 { 252 struct ethtool_link_settings *lsettings = &ksettings->base; 253 bool req_speed, req_lanes, req_duplex; 254 const struct nlattr *master_slave_cfg, *lanes_cfg; 255 int ret; 256 257 master_slave_cfg = tb[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG]; 258 if (master_slave_cfg) { 259 if (lsettings->master_slave_cfg == MASTER_SLAVE_CFG_UNSUPPORTED) { 260 NL_SET_ERR_MSG_ATTR(info->extack, master_slave_cfg, 261 "master/slave configuration not supported by device"); 262 return -EOPNOTSUPP; 263 } 264 } 265 266 *mod = false; 267 req_speed = tb[ETHTOOL_A_LINKMODES_SPEED]; 268 req_lanes = tb[ETHTOOL_A_LINKMODES_LANES]; 269 req_duplex = tb[ETHTOOL_A_LINKMODES_DUPLEX]; 270 271 ethnl_update_u8(&lsettings->autoneg, tb[ETHTOOL_A_LINKMODES_AUTONEG], 272 mod); 273 274 lanes_cfg = tb[ETHTOOL_A_LINKMODES_LANES]; 275 if (lanes_cfg) { 276 /* If autoneg is off and lanes parameter is not supported by the 277 * driver, return an error. 278 */ 279 if (!lsettings->autoneg && 280 !dev->ethtool_ops->cap_link_lanes_supported) { 281 NL_SET_ERR_MSG_ATTR(info->extack, lanes_cfg, 282 "lanes configuration not supported by device"); 283 return -EOPNOTSUPP; 284 } 285 } else if (!lsettings->autoneg) { 286 /* If autoneg is off and lanes parameter is not passed from user, 287 * set the lanes parameter to 0. 288 */ 289 ksettings->lanes = 0; 290 } 291 292 ret = ethnl_update_bitset(ksettings->link_modes.advertising, 293 __ETHTOOL_LINK_MODE_MASK_NBITS, 294 tb[ETHTOOL_A_LINKMODES_OURS], link_mode_names, 295 info->extack, mod); 296 if (ret < 0) 297 return ret; 298 ethnl_update_u32(&lsettings->speed, tb[ETHTOOL_A_LINKMODES_SPEED], 299 mod); 300 ethnl_update_u32(&ksettings->lanes, lanes_cfg, mod); 301 ethnl_update_u8(&lsettings->duplex, tb[ETHTOOL_A_LINKMODES_DUPLEX], 302 mod); 303 ethnl_update_u8(&lsettings->master_slave_cfg, master_slave_cfg, mod); 304 305 if (!tb[ETHTOOL_A_LINKMODES_OURS] && lsettings->autoneg && 306 (req_speed || req_lanes || req_duplex) && 307 ethnl_auto_linkmodes(ksettings, req_speed, req_lanes, req_duplex)) 308 *mod = true; 309 310 return 0; 311 } 312 313 int ethnl_set_linkmodes(struct sk_buff *skb, struct genl_info *info) 314 { 315 struct ethtool_link_ksettings ksettings = {}; 316 struct ethnl_req_info req_info = {}; 317 struct nlattr **tb = info->attrs; 318 struct net_device *dev; 319 bool mod = false; 320 int ret; 321 322 ret = ethnl_check_linkmodes(info, tb); 323 if (ret < 0) 324 return ret; 325 326 ret = ethnl_parse_header_dev_get(&req_info, 327 tb[ETHTOOL_A_LINKMODES_HEADER], 328 genl_info_net(info), info->extack, 329 true); 330 if (ret < 0) 331 return ret; 332 dev = req_info.dev; 333 ret = -EOPNOTSUPP; 334 if (!dev->ethtool_ops->get_link_ksettings || 335 !dev->ethtool_ops->set_link_ksettings) 336 goto out_dev; 337 338 rtnl_lock(); 339 ret = ethnl_ops_begin(dev); 340 if (ret < 0) 341 goto out_rtnl; 342 343 ret = __ethtool_get_link_ksettings(dev, &ksettings); 344 if (ret < 0) { 345 GENL_SET_ERR_MSG(info, "failed to retrieve link settings"); 346 goto out_ops; 347 } 348 349 ret = ethnl_update_linkmodes(info, tb, &ksettings, &mod, dev); 350 if (ret < 0) 351 goto out_ops; 352 353 if (mod) { 354 ret = dev->ethtool_ops->set_link_ksettings(dev, &ksettings); 355 if (ret < 0) 356 GENL_SET_ERR_MSG(info, "link settings update failed"); 357 else 358 ethtool_notify(dev, ETHTOOL_MSG_LINKMODES_NTF, NULL); 359 } 360 361 out_ops: 362 ethnl_ops_complete(dev); 363 out_rtnl: 364 rtnl_unlock(); 365 out_dev: 366 ethnl_parse_header_dev_put(&req_info); 367 return ret; 368 } 369