net/ethtool/linkmodes.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2
   3 #include "netlink.h"
   4 #include "common.h"
   5 #include "bitset.h"
   6
   7 struct linkmodes_req_info {
   8         struct ethnl_req_info           base;
   9 };
  10
  11 struct linkmodes_reply_data {
  12         struct ethnl_reply_data         base;
  13         struct ethtool_link_ksettings   ksettings;
  14         struct ethtool_link_settings    *lsettings;
  15         bool                            peer_empty;
  16 };
  17
  18 #define LINKMODES_REPDATA(__reply_base) \
  19         container_of(__reply_base, struct linkmodes_reply_data, base)
  20
  21 const struct nla_policy ethnl_linkmodes_get_policy[] = {
  22         [ETHTOOL_A_LINKMODES_HEADER]            =
  23                 NLA_POLICY_NESTED(ethnl_header_policy),
  24 };
  25
  26 static int linkmodes_prepare_data(const struct ethnl_req_info *req_base,
  27                                   struct ethnl_reply_data *reply_base,
  28                                   struct genl_info *info)
  29 {
  30         struct linkmodes_reply_data *data = LINKMODES_REPDATA(reply_base);
  31         struct net_device *dev = reply_base->dev;
  32         int ret;
  33
  34         data->lsettings = &data->ksettings.base;
  35
  36         ret = ethnl_ops_begin(dev);
  37         if (ret < 0)
  38                 return ret;
  39
  40         ret = __ethtool_get_link_ksettings(dev, &data->ksettings);
  41         if (ret < 0 && info) {
  42                 GENL_SET_ERR_MSG(info, "failed to retrieve link settings");
  43                 goto out;
  44         }
  45
  46         data->peer_empty =
  47                 bitmap_empty(data->ksettings.link_modes.lp_advertising,
  48                              __ETHTOOL_LINK_MODE_MASK_NBITS);
  49
  50 out:
  51         ethnl_ops_complete(dev);
  52         return ret;
  53 }
  54
  55 static int linkmodes_reply_size(const struct ethnl_req_info *req_base,
  56                                 const struct ethnl_reply_data *reply_base)
  57 {
  58         const struct linkmodes_reply_data *data = LINKMODES_REPDATA(reply_base);
  59         const struct ethtool_link_ksettings *ksettings = &data->ksettings;
  60         const struct ethtool_link_settings *lsettings = &ksettings->base;
  61         bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
  62         int len, ret;
  63
  64         len = nla_total_size(sizeof(u8)) /* LINKMODES_AUTONEG */
  65                 + nla_total_size(sizeof(u32)) /* LINKMODES_SPEED */
  66                 + nla_total_size(sizeof(u8)) /* LINKMODES_DUPLEX */
  67                 + 0;
  68         ret = ethnl_bitset_size(ksettings->link_modes.advertising,
  69                                 ksettings->link_modes.supported,
  70                                 __ETHTOOL_LINK_MODE_MASK_NBITS,
  71                                 link_mode_names, compact);
  72         if (ret < 0)
  73                 return ret;
  74         len += ret;
  75         if (!data->peer_empty) {
  76                 ret = ethnl_bitset_size(ksettings->link_modes.lp_advertising,
  77                                         NULL, __ETHTOOL_LINK_MODE_MASK_NBITS,
  78                                         link_mode_names, compact);
  79                 if (ret < 0)
  80                         return ret;
  81                 len += ret;
  82         }
  83
  84         if (lsettings->master_slave_cfg != MASTER_SLAVE_CFG_UNSUPPORTED)
  85                 len += nla_total_size(sizeof(u8));
  86
  87         if (lsettings->master_slave_state != MASTER_SLAVE_STATE_UNSUPPORTED)
  88                 len += nla_total_size(sizeof(u8));
  89
  90         return len;
  91 }
  92
  93 static int linkmodes_fill_reply(struct sk_buff *skb,
  94                                 const struct ethnl_req_info *req_base,
  95                                 const struct ethnl_reply_data *reply_base)
  96 {
  97         const struct linkmodes_reply_data *data = LINKMODES_REPDATA(reply_base);
  98         const struct ethtool_link_ksettings *ksettings = &data->ksettings;
  99         const struct ethtool_link_settings *lsettings = &ksettings->base;
 100         bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
 101         int ret;
 102
 103         if (nla_put_u8(skb, ETHTOOL_A_LINKMODES_AUTONEG, lsettings->autoneg))
 104                 return -EMSGSIZE;
 105
 106         ret = ethnl_put_bitset(skb, ETHTOOL_A_LINKMODES_OURS,
 107                                ksettings->link_modes.advertising,
 108                                ksettings->link_modes.supported,
 109                                __ETHTOOL_LINK_MODE_MASK_NBITS, link_mode_names,
 110                                compact);
 111         if (ret < 0)
 112                 return -EMSGSIZE;
 113         if (!data->peer_empty) {
 114                 ret = ethnl_put_bitset(skb, ETHTOOL_A_LINKMODES_PEER,
 115                                        ksettings->link_modes.lp_advertising,
 116                                        NULL, __ETHTOOL_LINK_MODE_MASK_NBITS,
 117                                        link_mode_names, compact);
 118                 if (ret < 0)
 119                         return -EMSGSIZE;
 120         }
 121
 122         if (nla_put_u32(skb, ETHTOOL_A_LINKMODES_SPEED, lsettings->speed) ||
 123             nla_put_u8(skb, ETHTOOL_A_LINKMODES_DUPLEX, lsettings->duplex))
 124                 return -EMSGSIZE;
 125
 126         if (lsettings->master_slave_cfg != MASTER_SLAVE_CFG_UNSUPPORTED &&
 127             nla_put_u8(skb, ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG,
 128                        lsettings->master_slave_cfg))
 129                 return -EMSGSIZE;
 130
 131         if (lsettings->master_slave_state != MASTER_SLAVE_STATE_UNSUPPORTED &&
 132             nla_put_u8(skb, ETHTOOL_A_LINKMODES_MASTER_SLAVE_STATE,
 133                        lsettings->master_slave_state))
 134                 return -EMSGSIZE;
 135
 136         return 0;
 137 }
 138
 139 const struct ethnl_request_ops ethnl_linkmodes_request_ops = {
 140         .request_cmd            = ETHTOOL_MSG_LINKMODES_GET,
 141         .reply_cmd              = ETHTOOL_MSG_LINKMODES_GET_REPLY,
 142         .hdr_attr               = ETHTOOL_A_LINKMODES_HEADER,
 143         .req_info_size          = sizeof(struct linkmodes_req_info),
 144         .reply_data_size        = sizeof(struct linkmodes_reply_data),
 145
 146         .prepare_data           = linkmodes_prepare_data,
 147         .reply_size             = linkmodes_reply_size,
 148         .fill_reply             = linkmodes_fill_reply,
 149 };
 150
 151 /* LINKMODES_SET */
 152
 153 struct link_mode_info {
 154         int                             speed;
 155         u8                              duplex;
 156 };
 157
 158 #define __DEFINE_LINK_MODE_PARAMS(_speed, _type, _duplex) \
 159         [ETHTOOL_LINK_MODE(_speed, _type, _duplex)] = { \
 160                 .speed  = SPEED_ ## _speed, \
 161                 .duplex = __DUPLEX_ ## _duplex \
 162         }
 163 #define __DUPLEX_Half DUPLEX_HALF
 164 #define __DUPLEX_Full DUPLEX_FULL
 165 #define __DEFINE_SPECIAL_MODE_PARAMS(_mode) \
 166         [ETHTOOL_LINK_MODE_ ## _mode ## _BIT] = { \
 167                 .speed  = SPEED_UNKNOWN, \
 168                 .duplex = DUPLEX_UNKNOWN, \
 169         }
 170
 171 static const struct link_mode_info link_mode_params[] = {
 172         __DEFINE_LINK_MODE_PARAMS(10, T, Half),
 173         __DEFINE_LINK_MODE_PARAMS(10, T, Full),
 174         __DEFINE_LINK_MODE_PARAMS(100, T, Half),
 175         __DEFINE_LINK_MODE_PARAMS(100, T, Full),
 176         __DEFINE_LINK_MODE_PARAMS(1000, T, Half),
 177         __DEFINE_LINK_MODE_PARAMS(1000, T, Full),
 178         __DEFINE_SPECIAL_MODE_PARAMS(Autoneg),
 179         __DEFINE_SPECIAL_MODE_PARAMS(TP),
 180         __DEFINE_SPECIAL_MODE_PARAMS(AUI),
 181         __DEFINE_SPECIAL_MODE_PARAMS(MII),
 182         __DEFINE_SPECIAL_MODE_PARAMS(FIBRE),
 183         __DEFINE_SPECIAL_MODE_PARAMS(BNC),
 184         __DEFINE_LINK_MODE_PARAMS(10000, T, Full),
 185         __DEFINE_SPECIAL_MODE_PARAMS(Pause),
 186         __DEFINE_SPECIAL_MODE_PARAMS(Asym_Pause),
 187         __DEFINE_LINK_MODE_PARAMS(2500, X, Full),
 188         __DEFINE_SPECIAL_MODE_PARAMS(Backplane),
 189         __DEFINE_LINK_MODE_PARAMS(1000, KX, Full),
 190         __DEFINE_LINK_MODE_PARAMS(10000, KX4, Full),
 191         __DEFINE_LINK_MODE_PARAMS(10000, KR, Full),
 192         [ETHTOOL_LINK_MODE_10000baseR_FEC_BIT] = {
 193                 .speed  = SPEED_10000,
 194                 .duplex = DUPLEX_FULL,
 195         },
 196         __DEFINE_LINK_MODE_PARAMS(20000, MLD2, Full),
 197         __DEFINE_LINK_MODE_PARAMS(20000, KR2, Full),
 198         __DEFINE_LINK_MODE_PARAMS(40000, KR4, Full),
 199         __DEFINE_LINK_MODE_PARAMS(40000, CR4, Full),
 200         __DEFINE_LINK_MODE_PARAMS(40000, SR4, Full),
 201         __DEFINE_LINK_MODE_PARAMS(40000, LR4, Full),
 202         __DEFINE_LINK_MODE_PARAMS(56000, KR4, Full),
 203         __DEFINE_LINK_MODE_PARAMS(56000, CR4, Full),
 204         __DEFINE_LINK_MODE_PARAMS(56000, SR4, Full),
 205         __DEFINE_LINK_MODE_PARAMS(56000, LR4, Full),
 206         __DEFINE_LINK_MODE_PARAMS(25000, CR, Full),
 207         __DEFINE_LINK_MODE_PARAMS(25000, KR, Full),
 208         __DEFINE_LINK_MODE_PARAMS(25000, SR, Full),
 209         __DEFINE_LINK_MODE_PARAMS(50000, CR2, Full),
 210         __DEFINE_LINK_MODE_PARAMS(50000, KR2, Full),
 211         __DEFINE_LINK_MODE_PARAMS(100000, KR4, Full),
 212         __DEFINE_LINK_MODE_PARAMS(100000, SR4, Full),
 213         __DEFINE_LINK_MODE_PARAMS(100000, CR4, Full),
 214         __DEFINE_LINK_MODE_PARAMS(100000, LR4_ER4, Full),
 215         __DEFINE_LINK_MODE_PARAMS(50000, SR2, Full),
 216         __DEFINE_LINK_MODE_PARAMS(1000, X, Full),
 217         __DEFINE_LINK_MODE_PARAMS(10000, CR, Full),
 218         __DEFINE_LINK_MODE_PARAMS(10000, SR, Full),
 219         __DEFINE_LINK_MODE_PARAMS(10000, LR, Full),
 220         __DEFINE_LINK_MODE_PARAMS(10000, LRM, Full),
 221         __DEFINE_LINK_MODE_PARAMS(10000, ER, Full),
 222         __DEFINE_LINK_MODE_PARAMS(2500, T, Full),
 223         __DEFINE_LINK_MODE_PARAMS(5000, T, Full),
 224         __DEFINE_SPECIAL_MODE_PARAMS(FEC_NONE),
 225         __DEFINE_SPECIAL_MODE_PARAMS(FEC_RS),
 226         __DEFINE_SPECIAL_MODE_PARAMS(FEC_BASER),
 227         __DEFINE_LINK_MODE_PARAMS(50000, KR, Full),
 228         __DEFINE_LINK_MODE_PARAMS(50000, SR, Full),
 229         __DEFINE_LINK_MODE_PARAMS(50000, CR, Full),
 230         __DEFINE_LINK_MODE_PARAMS(50000, LR_ER_FR, Full),
 231         __DEFINE_LINK_MODE_PARAMS(50000, DR, Full),
 232         __DEFINE_LINK_MODE_PARAMS(100000, KR2, Full),
 233         __DEFINE_LINK_MODE_PARAMS(100000, SR2, Full),
 234         __DEFINE_LINK_MODE_PARAMS(100000, CR2, Full),
 235         __DEFINE_LINK_MODE_PARAMS(100000, LR2_ER2_FR2, Full),
 236         __DEFINE_LINK_MODE_PARAMS(100000, DR2, Full),
 237         __DEFINE_LINK_MODE_PARAMS(200000, KR4, Full),
 238         __DEFINE_LINK_MODE_PARAMS(200000, SR4, Full),
 239         __DEFINE_LINK_MODE_PARAMS(200000, LR4_ER4_FR4, Full),
 240         __DEFINE_LINK_MODE_PARAMS(200000, DR4, Full),
 241         __DEFINE_LINK_MODE_PARAMS(200000, CR4, Full),
 242         __DEFINE_LINK_MODE_PARAMS(100, T1, Full),
 243         __DEFINE_LINK_MODE_PARAMS(1000, T1, Full),
 244         __DEFINE_LINK_MODE_PARAMS(400000, KR8, Full),
 245         __DEFINE_LINK_MODE_PARAMS(400000, SR8, Full),
 246         __DEFINE_LINK_MODE_PARAMS(400000, LR8_ER8_FR8, Full),
 247         __DEFINE_LINK_MODE_PARAMS(400000, DR8, Full),
 248         __DEFINE_LINK_MODE_PARAMS(400000, CR8, Full),
 249         __DEFINE_SPECIAL_MODE_PARAMS(FEC_LLRS),
 250         __DEFINE_LINK_MODE_PARAMS(100000, KR, Full),
 251         __DEFINE_LINK_MODE_PARAMS(100000, SR, Full),
 252         __DEFINE_LINK_MODE_PARAMS(100000, LR_ER_FR, Full),
 253         __DEFINE_LINK_MODE_PARAMS(100000, DR, Full),
 254         __DEFINE_LINK_MODE_PARAMS(100000, CR, Full),
 255         __DEFINE_LINK_MODE_PARAMS(200000, KR2, Full),
 256         __DEFINE_LINK_MODE_PARAMS(200000, SR2, Full),
 257         __DEFINE_LINK_MODE_PARAMS(200000, LR2_ER2_FR2, Full),
 258         __DEFINE_LINK_MODE_PARAMS(200000, DR2, Full),
 259         __DEFINE_LINK_MODE_PARAMS(200000, CR2, Full),
 260         __DEFINE_LINK_MODE_PARAMS(400000, KR4, Full),
 261         __DEFINE_LINK_MODE_PARAMS(400000, SR4, Full),
 262         __DEFINE_LINK_MODE_PARAMS(400000, LR4_ER4_FR4, Full),
 263         __DEFINE_LINK_MODE_PARAMS(400000, DR4, Full),
 264         __DEFINE_LINK_MODE_PARAMS(400000, CR4, Full),
 265         __DEFINE_LINK_MODE_PARAMS(100, FX, Half),
 266         __DEFINE_LINK_MODE_PARAMS(100, FX, Full),
 267 };
 268
 269 const struct nla_policy ethnl_linkmodes_set_policy[] = {
 270         [ETHTOOL_A_LINKMODES_HEADER]            =
 271                 NLA_POLICY_NESTED(ethnl_header_policy),
 272         [ETHTOOL_A_LINKMODES_AUTONEG]           = { .type = NLA_U8 },
 273         [ETHTOOL_A_LINKMODES_OURS]              = { .type = NLA_NESTED },
 274         [ETHTOOL_A_LINKMODES_SPEED]             = { .type = NLA_U32 },
 275         [ETHTOOL_A_LINKMODES_DUPLEX]            = { .type = NLA_U8 },
 276         [ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG]  = { .type = NLA_U8 },
 277 };
 278
 279 /* Set advertised link modes to all supported modes matching requested speed
 280  * and duplex values. Called when autonegotiation is on, speed or duplex is
 281  * requested but no link mode change. This is done in userspace with ioctl()
 282  * interface, move it into kernel for netlink.
 283  * Returns true if advertised modes bitmap was modified.
 284  */
 285 static bool ethnl_auto_linkmodes(struct ethtool_link_ksettings *ksettings,
 286                                  bool req_speed, bool req_duplex)
 287 {
 288         unsigned long *advertising = ksettings->link_modes.advertising;
 289         unsigned long *supported = ksettings->link_modes.supported;
 290         DECLARE_BITMAP(old_adv, __ETHTOOL_LINK_MODE_MASK_NBITS);
 291         unsigned int i;
 292
 293         BUILD_BUG_ON(ARRAY_SIZE(link_mode_params) !=
 294                      __ETHTOOL_LINK_MODE_MASK_NBITS);
 295
 296         bitmap_copy(old_adv, advertising, __ETHTOOL_LINK_MODE_MASK_NBITS);
 297
 298         for (i = 0; i < __ETHTOOL_LINK_MODE_MASK_NBITS; i++) {
 299                 const struct link_mode_info *info = &link_mode_params[i];
 300
 301                 if (info->speed == SPEED_UNKNOWN)
 302                         continue;
 303                 if (test_bit(i, supported) &&
 304                     (!req_speed || info->speed == ksettings->base.speed) &&
 305                     (!req_duplex || info->duplex == ksettings->base.duplex))
 306                         set_bit(i, advertising);
 307                 else
 308                         clear_bit(i, advertising);
 309         }
 310
 311         return !bitmap_equal(old_adv, advertising,
 312                              __ETHTOOL_LINK_MODE_MASK_NBITS);
 313 }
 314
 315 static bool ethnl_validate_master_slave_cfg(u8 cfg)
 316 {
 317         switch (cfg) {
 318         case MASTER_SLAVE_CFG_MASTER_PREFERRED:
 319         case MASTER_SLAVE_CFG_SLAVE_PREFERRED:
 320         case MASTER_SLAVE_CFG_MASTER_FORCE:
 321         case MASTER_SLAVE_CFG_SLAVE_FORCE:
 322                 return true;
 323         }
 324
 325         return false;
 326 }
 327
 328 static int ethnl_update_linkmodes(struct genl_info *info, struct nlattr **tb,
 329                                   struct ethtool_link_ksettings *ksettings,
 330                                   bool *mod)
 331 {
 332         struct ethtool_link_settings *lsettings = &ksettings->base;
 333         bool req_speed, req_duplex;
 334         const struct nlattr *master_slave_cfg;
 335         int ret;
 336
 337         master_slave_cfg = tb[ETHTOOL_A_LINKMODES_MASTER_SLAVE_CFG];
 338         if (master_slave_cfg) {
 339                 u8 cfg = nla_get_u8(master_slave_cfg);
 340
 341                 if (lsettings->master_slave_cfg == MASTER_SLAVE_CFG_UNSUPPORTED) {
 342                         NL_SET_ERR_MSG_ATTR(info->extack, master_slave_cfg,
 343                                             "master/slave configuration not supported by device");
 344                         return -EOPNOTSUPP;
 345                 }
 346
 347                 if (!ethnl_validate_master_slave_cfg(cfg)) {
 348                         NL_SET_ERR_MSG_ATTR(info->extack, master_slave_cfg,
 349                                             "master/slave value is invalid");
 350                         return -EOPNOTSUPP;
 351                 }
 352         }
 353
 354         *mod = false;
 355         req_speed = tb[ETHTOOL_A_LINKMODES_SPEED];
 356         req_duplex = tb[ETHTOOL_A_LINKMODES_DUPLEX];
 357
 358         ethnl_update_u8(&lsettings->autoneg, tb[ETHTOOL_A_LINKMODES_AUTONEG],
 359                         mod);
 360         ret = ethnl_update_bitset(ksettings->link_modes.advertising,
 361                                   __ETHTOOL_LINK_MODE_MASK_NBITS,
 362                                   tb[ETHTOOL_A_LINKMODES_OURS], link_mode_names,
 363                                   info->extack, mod);
 364         if (ret < 0)
 365                 return ret;
 366         ethnl_update_u32(&lsettings->speed, tb[ETHTOOL_A_LINKMODES_SPEED],
 367                          mod);
 368         ethnl_update_u8(&lsettings->duplex, tb[ETHTOOL_A_LINKMODES_DUPLEX],
 369                         mod);
 370         ethnl_update_u8(&lsettings->master_slave_cfg, master_slave_cfg, mod);
 371
 372         if (!tb[ETHTOOL_A_LINKMODES_OURS] && lsettings->autoneg &&
 373             (req_speed || req_duplex) &&
 374             ethnl_auto_linkmodes(ksettings, req_speed, req_duplex))
 375                 *mod = true;
 376
 377         return 0;
 378 }
 379
 380 int ethnl_set_linkmodes(struct sk_buff *skb, struct genl_info *info)
 381 {
 382         struct ethtool_link_ksettings ksettings = {};
 383         struct ethnl_req_info req_info = {};
 384         struct nlattr **tb = info->attrs;
 385         struct net_device *dev;
 386         bool mod = false;
 387         int ret;
 388
 389         ret = ethnl_parse_header_dev_get(&req_info,
 390                                          tb[ETHTOOL_A_LINKMODES_HEADER],
 391                                          genl_info_net(info), info->extack,
 392                                          true);
 393         if (ret < 0)
 394                 return ret;
 395         dev = req_info.dev;
 396         ret = -EOPNOTSUPP;
 397         if (!dev->ethtool_ops->get_link_ksettings ||
 398             !dev->ethtool_ops->set_link_ksettings)
 399                 goto out_dev;
 400
 401         rtnl_lock();
 402         ret = ethnl_ops_begin(dev);
 403         if (ret < 0)
 404                 goto out_rtnl;
 405
 406         ret = __ethtool_get_link_ksettings(dev, &ksettings);
 407         if (ret < 0) {
 408                 GENL_SET_ERR_MSG(info, "failed to retrieve link settings");
 409                 goto out_ops;
 410         }
 411
 412         ret = ethnl_update_linkmodes(info, tb, &ksettings, &mod);
 413         if (ret < 0)
 414                 goto out_ops;
 415
 416         if (mod) {
 417                 ret = dev->ethtool_ops->set_link_ksettings(dev, &ksettings);
 418                 if (ret < 0)
 419                         GENL_SET_ERR_MSG(info, "link settings update failed");
 420                 else
 421                         ethtool_notify(dev, ETHTOOL_MSG_LINKMODES_NTF, NULL);
 422         }
 423
 424 out_ops:
 425         ethnl_ops_complete(dev);
 426 out_rtnl:
 427         rtnl_unlock();
 428 out_dev:
 429         dev_put(dev);
 430         return ret;
 431 }