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 /* 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         dev_put(dev);
 362         return ret;
 363 }