drivers/net/phy/phylink.c

   1 /*
   2  * phylink models the MAC to optional PHY connection, supporting
   3  * technologies such as SFP cages where the PHY is hot-pluggable.
   4  *
   5  * Copyright (C) 2015 Russell King
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/ethtool.h>
  12 #include <linux/export.h>
  13 #include <linux/gpio/consumer.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/of.h>
  16 #include <linux/of_mdio.h>
  17 #include <linux/phy.h>
  18 #include <linux/phy_fixed.h>
  19 #include <linux/phylink.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/spinlock.h>
  22 #include <linux/workqueue.h>
  23
  24 #include "sfp.h"
  25 #include "swphy.h"
  26
  27 #define SUPPORTED_INTERFACES \
  28         (SUPPORTED_TP | SUPPORTED_MII | SUPPORTED_FIBRE | \
  29          SUPPORTED_BNC | SUPPORTED_AUI | SUPPORTED_Backplane)
  30 #define ADVERTISED_INTERFACES \
  31         (ADVERTISED_TP | ADVERTISED_MII | ADVERTISED_FIBRE | \
  32          ADVERTISED_BNC | ADVERTISED_AUI | ADVERTISED_Backplane)
  33
  34 enum {
  35         PHYLINK_DISABLE_STOPPED,
  36         PHYLINK_DISABLE_LINK,
  37 };
  38
  39 struct phylink {
  40         struct net_device *netdev;
  41         const struct phylink_mac_ops *ops;
  42
  43         unsigned long phylink_disable_state; /* bitmask of disables */
  44         struct phy_device *phydev;
  45         phy_interface_t link_interface; /* PHY_INTERFACE_xxx */
  46         u8 link_an_mode;                /* MLO_AN_xxx */
  47         u8 link_port;                   /* The current non-phy ethtool port */
  48         __ETHTOOL_DECLARE_LINK_MODE_MASK(supported);
  49
  50         /* The link configuration settings */
  51         struct phylink_link_state link_config;
  52         struct gpio_desc *link_gpio;
  53
  54         struct mutex state_mutex;
  55         struct phylink_link_state phy_state;
  56         struct work_struct resolve;
  57
  58         bool mac_link_dropped;
  59
  60         struct sfp_bus *sfp_bus;
  61 };
  62
  63 static inline void linkmode_zero(unsigned long *dst)
  64 {
  65         bitmap_zero(dst, __ETHTOOL_LINK_MODE_MASK_NBITS);
  66 }
  67
  68 static inline void linkmode_copy(unsigned long *dst, const unsigned long *src)
  69 {
  70         bitmap_copy(dst, src, __ETHTOOL_LINK_MODE_MASK_NBITS);
  71 }
  72
  73 static inline void linkmode_and(unsigned long *dst, const unsigned long *a,
  74                                 const unsigned long *b)
  75 {
  76         bitmap_and(dst, a, b, __ETHTOOL_LINK_MODE_MASK_NBITS);
  77 }
  78
  79 static inline void linkmode_or(unsigned long *dst, const unsigned long *a,
  80                                 const unsigned long *b)
  81 {
  82         bitmap_or(dst, a, b, __ETHTOOL_LINK_MODE_MASK_NBITS);
  83 }
  84
  85 static inline bool linkmode_empty(const unsigned long *src)
  86 {
  87         return bitmap_empty(src, __ETHTOOL_LINK_MODE_MASK_NBITS);
  88 }
  89
  90 void phylink_set_port_modes(unsigned long *mask)
  91 {
  92         phylink_set(mask, TP);
  93         phylink_set(mask, AUI);
  94         phylink_set(mask, MII);
  95         phylink_set(mask, FIBRE);
  96         phylink_set(mask, BNC);
  97         phylink_set(mask, Backplane);
  98 }
  99 EXPORT_SYMBOL_GPL(phylink_set_port_modes);
 100
 101 static int phylink_is_empty_linkmode(const unsigned long *linkmode)
 102 {
 103         __ETHTOOL_DECLARE_LINK_MODE_MASK(tmp) = { 0, };
 104
 105         phylink_set_port_modes(tmp);
 106         phylink_set(tmp, Autoneg);
 107         phylink_set(tmp, Pause);
 108         phylink_set(tmp, Asym_Pause);
 109
 110         bitmap_andnot(tmp, linkmode, tmp, __ETHTOOL_LINK_MODE_MASK_NBITS);
 111
 112         return linkmode_empty(tmp);
 113 }
 114
 115 static const char *phylink_an_mode_str(unsigned int mode)
 116 {
 117         static const char *modestr[] = {
 118                 [MLO_AN_PHY] = "phy",
 119                 [MLO_AN_FIXED] = "fixed",
 120                 [MLO_AN_SGMII] = "SGMII",
 121                 [MLO_AN_8023Z] = "802.3z",
 122         };
 123
 124         return mode < ARRAY_SIZE(modestr) ? modestr[mode] : "unknown";
 125 }
 126
 127 static int phylink_validate(struct phylink *pl, unsigned long *supported,
 128                             struct phylink_link_state *state)
 129 {
 130         pl->ops->validate(pl->netdev, supported, state);
 131
 132         return phylink_is_empty_linkmode(supported) ? -EINVAL : 0;
 133 }
 134
 135 static int phylink_parse_fixedlink(struct phylink *pl, struct device_node *np)
 136 {
 137         struct device_node *fixed_node;
 138         const struct phy_setting *s;
 139         struct gpio_desc *desc;
 140         const __be32 *fixed_prop;
 141         u32 speed;
 142         int ret, len;
 143
 144         fixed_node = of_get_child_by_name(np, "fixed-link");
 145         if (fixed_node) {
 146                 ret = of_property_read_u32(fixed_node, "speed", &speed);
 147
 148                 pl->link_config.speed = speed;
 149                 pl->link_config.duplex = DUPLEX_HALF;
 150
 151                 if (of_property_read_bool(fixed_node, "full-duplex"))
 152                         pl->link_config.duplex = DUPLEX_FULL;
 153
 154                 /* We treat the "pause" and "asym-pause" terminology as
 155                  * defining the link partner's ability. */
 156                 if (of_property_read_bool(fixed_node, "pause"))
 157                         pl->link_config.pause |= MLO_PAUSE_SYM;
 158                 if (of_property_read_bool(fixed_node, "asym-pause"))
 159                         pl->link_config.pause |= MLO_PAUSE_ASYM;
 160
 161                 if (ret == 0) {
 162                         desc = fwnode_get_named_gpiod(&fixed_node->fwnode,
 163                                                       "link-gpios", 0,
 164                                                       GPIOD_IN, "?");
 165
 166                         if (!IS_ERR(desc))
 167                                 pl->link_gpio = desc;
 168                         else if (desc == ERR_PTR(-EPROBE_DEFER))
 169                                 ret = -EPROBE_DEFER;
 170                 }
 171                 of_node_put(fixed_node);
 172
 173                 if (ret)
 174                         return ret;
 175         } else {
 176                 fixed_prop = of_get_property(np, "fixed-link", &len);
 177                 if (!fixed_prop) {
 178                         netdev_err(pl->netdev, "broken fixed-link?\n");
 179                         return -EINVAL;
 180                 }
 181                 if (len == 5 * sizeof(*fixed_prop)) {
 182                         pl->link_config.duplex = be32_to_cpu(fixed_prop[1]) ?
 183                                                 DUPLEX_FULL : DUPLEX_HALF;
 184                         pl->link_config.speed = be32_to_cpu(fixed_prop[2]);
 185                         if (be32_to_cpu(fixed_prop[3]))
 186                                 pl->link_config.pause |= MLO_PAUSE_SYM;
 187                         if (be32_to_cpu(fixed_prop[4]))
 188                                 pl->link_config.pause |= MLO_PAUSE_ASYM;
 189                 }
 190         }
 191
 192         if (pl->link_config.speed > SPEED_1000 &&
 193             pl->link_config.duplex != DUPLEX_FULL)
 194                 netdev_warn(pl->netdev, "fixed link specifies half duplex for %dMbps link?\n",
 195                             pl->link_config.speed);
 196
 197         bitmap_fill(pl->supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
 198         linkmode_copy(pl->link_config.advertising, pl->supported);
 199         phylink_validate(pl, pl->supported, &pl->link_config);
 200
 201         s = phy_lookup_setting(pl->link_config.speed, pl->link_config.duplex,
 202                                pl->supported,
 203                                __ETHTOOL_LINK_MODE_MASK_NBITS, true);
 204         linkmode_zero(pl->supported);
 205         phylink_set(pl->supported, MII);
 206         if (s) {
 207                 __set_bit(s->bit, pl->supported);
 208         } else {
 209                 netdev_warn(pl->netdev, "fixed link %s duplex %dMbps not recognised\n",
 210                             pl->link_config.duplex == DUPLEX_FULL ? "full" : "half",
 211                             pl->link_config.speed);
 212         }
 213
 214         linkmode_and(pl->link_config.advertising, pl->link_config.advertising,
 215                      pl->supported);
 216
 217         pl->link_config.link = 1;
 218         pl->link_config.an_complete = 1;
 219
 220         return 0;
 221 }
 222
 223 static int phylink_parse_mode(struct phylink *pl, struct device_node *np)
 224 {
 225         struct device_node *dn;
 226         const char *managed;
 227
 228         dn = of_get_child_by_name(np, "fixed-link");
 229         if (dn || of_find_property(np, "fixed-link", NULL))
 230                 pl->link_an_mode = MLO_AN_FIXED;
 231         of_node_put(dn);
 232
 233         if (of_property_read_string(np, "managed", &managed) == 0 &&
 234             strcmp(managed, "in-band-status") == 0) {
 235                 if (pl->link_an_mode == MLO_AN_FIXED) {
 236                         netdev_err(pl->netdev,
 237                                    "can't use both fixed-link and in-band-status\n");
 238                         return -EINVAL;
 239                 }
 240
 241                 linkmode_zero(pl->supported);
 242                 phylink_set(pl->supported, MII);
 243                 phylink_set(pl->supported, Autoneg);
 244                 phylink_set(pl->supported, Asym_Pause);
 245                 phylink_set(pl->supported, Pause);
 246                 pl->link_config.an_enabled = true;
 247
 248                 switch (pl->link_config.interface) {
 249                 case PHY_INTERFACE_MODE_SGMII:
 250                         phylink_set(pl->supported, 10baseT_Half);
 251                         phylink_set(pl->supported, 10baseT_Full);
 252                         phylink_set(pl->supported, 100baseT_Half);
 253                         phylink_set(pl->supported, 100baseT_Full);
 254                         phylink_set(pl->supported, 1000baseT_Half);
 255                         phylink_set(pl->supported, 1000baseT_Full);
 256                         pl->link_an_mode = MLO_AN_SGMII;
 257                         break;
 258
 259                 case PHY_INTERFACE_MODE_1000BASEX:
 260                         phylink_set(pl->supported, 1000baseX_Full);
 261                         pl->link_an_mode = MLO_AN_8023Z;
 262                         break;
 263
 264                 case PHY_INTERFACE_MODE_2500BASEX:
 265                         phylink_set(pl->supported, 2500baseX_Full);
 266                         pl->link_an_mode = MLO_AN_8023Z;
 267                         break;
 268
 269                 case PHY_INTERFACE_MODE_10GKR:
 270                         phylink_set(pl->supported, 10baseT_Half);
 271                         phylink_set(pl->supported, 10baseT_Full);
 272                         phylink_set(pl->supported, 100baseT_Half);
 273                         phylink_set(pl->supported, 100baseT_Full);
 274                         phylink_set(pl->supported, 1000baseT_Half);
 275                         phylink_set(pl->supported, 1000baseT_Full);
 276                         phylink_set(pl->supported, 1000baseX_Full);
 277                         phylink_set(pl->supported, 10000baseKR_Full);
 278                         phylink_set(pl->supported, 10000baseCR_Full);
 279                         phylink_set(pl->supported, 10000baseSR_Full);
 280                         phylink_set(pl->supported, 10000baseLR_Full);
 281                         phylink_set(pl->supported, 10000baseLRM_Full);
 282                         phylink_set(pl->supported, 10000baseER_Full);
 283                         pl->link_an_mode = MLO_AN_SGMII;
 284                         break;
 285
 286                 default:
 287                         netdev_err(pl->netdev,
 288                                    "incorrect link mode %s for in-band status\n",
 289                                    phy_modes(pl->link_config.interface));
 290                         return -EINVAL;
 291                 }
 292
 293                 linkmode_copy(pl->link_config.advertising, pl->supported);
 294
 295                 if (phylink_validate(pl, pl->supported, &pl->link_config)) {
 296                         netdev_err(pl->netdev,
 297                                    "failed to validate link configuration for in-band status\n");
 298                         return -EINVAL;
 299                 }
 300         }
 301
 302         return 0;
 303 }
 304
 305 static void phylink_mac_config(struct phylink *pl,
 306                                const struct phylink_link_state *state)
 307 {
 308         netdev_dbg(pl->netdev,
 309                    "%s: mode=%s/%s/%s/%s adv=%*pb pause=%02x link=%u an=%u\n",
 310                    __func__, phylink_an_mode_str(pl->link_an_mode),
 311                    phy_modes(state->interface),
 312                    phy_speed_to_str(state->speed),
 313                    phy_duplex_to_str(state->duplex),
 314                    __ETHTOOL_LINK_MODE_MASK_NBITS, state->advertising,
 315                    state->pause, state->link, state->an_enabled);
 316
 317         pl->ops->mac_config(pl->netdev, pl->link_an_mode, state);
 318 }
 319
 320 static void phylink_mac_an_restart(struct phylink *pl)
 321 {
 322         if (pl->link_config.an_enabled &&
 323             (pl->link_config.interface == PHY_INTERFACE_MODE_1000BASEX ||
 324              pl->link_config.interface == PHY_INTERFACE_MODE_2500BASEX))
 325                 pl->ops->mac_an_restart(pl->netdev);
 326 }
 327
 328 static int phylink_get_mac_state(struct phylink *pl, struct phylink_link_state *state)
 329 {
 330         struct net_device *ndev = pl->netdev;
 331
 332         linkmode_copy(state->advertising, pl->link_config.advertising);
 333         linkmode_zero(state->lp_advertising);
 334         state->interface = pl->link_config.interface;
 335         state->an_enabled = pl->link_config.an_enabled;
 336         state->link = 1;
 337
 338         return pl->ops->mac_link_state(ndev, state);
 339 }
 340
 341 /* The fixed state is... fixed except for the link state,
 342  * which may be determined by a GPIO.
 343  */
 344 static void phylink_get_fixed_state(struct phylink *pl, struct phylink_link_state *state)
 345 {
 346         *state = pl->link_config;
 347         if (pl->link_gpio)
 348                 state->link = !!gpiod_get_value(pl->link_gpio);
 349 }
 350
 351 /* Flow control is resolved according to our and the link partners
 352  * advertisments using the following drawn from the 802.3 specs:
 353  *  Local device  Link partner
 354  *  Pause AsymDir Pause AsymDir Result
 355  *    1     X       1     X     TX+RX
 356  *    0     1       1     1     RX
 357  *    1     1       0     1     TX
 358  */
 359 static void phylink_resolve_flow(struct phylink *pl,
 360         struct phylink_link_state *state)
 361 {
 362         int new_pause = 0;
 363
 364         if (pl->link_config.pause & MLO_PAUSE_AN) {
 365                 int pause = 0;
 366
 367                 if (phylink_test(pl->link_config.advertising, Pause))
 368                         pause |= MLO_PAUSE_SYM;
 369                 if (phylink_test(pl->link_config.advertising, Asym_Pause))
 370                         pause |= MLO_PAUSE_ASYM;
 371
 372                 pause &= state->pause;
 373
 374                 if (pause & MLO_PAUSE_SYM)
 375                         new_pause = MLO_PAUSE_TX | MLO_PAUSE_RX;
 376                 else if (pause & MLO_PAUSE_ASYM)
 377                         new_pause = state->pause & MLO_PAUSE_SYM ?
 378                                  MLO_PAUSE_RX : MLO_PAUSE_TX;
 379         } else {
 380                 new_pause = pl->link_config.pause & MLO_PAUSE_TXRX_MASK;
 381         }
 382
 383         state->pause &= ~MLO_PAUSE_TXRX_MASK;
 384         state->pause |= new_pause;
 385 }
 386
 387 static const char *phylink_pause_to_str(int pause)
 388 {
 389         switch (pause & MLO_PAUSE_TXRX_MASK) {
 390         case MLO_PAUSE_TX | MLO_PAUSE_RX:
 391                 return "rx/tx";
 392         case MLO_PAUSE_TX:
 393                 return "tx";
 394         case MLO_PAUSE_RX:
 395                 return "rx";
 396         default:
 397                 return "off";
 398         }
 399 }
 400
 401 static void phylink_resolve(struct work_struct *w)
 402 {
 403         struct phylink *pl = container_of(w, struct phylink, resolve);
 404         struct phylink_link_state link_state;
 405         struct net_device *ndev = pl->netdev;
 406
 407         mutex_lock(&pl->state_mutex);
 408         if (pl->phylink_disable_state) {
 409                 pl->mac_link_dropped = false;
 410                 link_state.link = false;
 411         } else if (pl->mac_link_dropped) {
 412                 link_state.link = false;
 413         } else {
 414                 switch (pl->link_an_mode) {
 415                 case MLO_AN_PHY:
 416                         link_state = pl->phy_state;
 417                         phylink_resolve_flow(pl, &link_state);
 418                         phylink_mac_config(pl, &link_state);
 419                         break;
 420
 421                 case MLO_AN_FIXED:
 422                         phylink_get_fixed_state(pl, &link_state);
 423                         phylink_mac_config(pl, &link_state);
 424                         break;
 425
 426                 case MLO_AN_SGMII:
 427                         phylink_get_mac_state(pl, &link_state);
 428                         if (pl->phydev) {
 429                                 bool changed = false;
 430
 431                                 link_state.link = link_state.link &&
 432                                                   pl->phy_state.link;
 433
 434                                 if (pl->phy_state.interface !=
 435                                     link_state.interface) {
 436                                         link_state.interface = pl->phy_state.interface;
 437                                         changed = true;
 438                                 }
 439
 440                                 /* Propagate the flow control from the PHY
 441                                  * to the MAC. Also propagate the interface
 442                                  * if changed.
 443                                  */
 444                                 if (pl->phy_state.link || changed) {
 445                                         link_state.pause |= pl->phy_state.pause;
 446                                         phylink_resolve_flow(pl, &link_state);
 447
 448                                         phylink_mac_config(pl, &link_state);
 449                                 }
 450                         }
 451                         break;
 452
 453                 case MLO_AN_8023Z:
 454                         phylink_get_mac_state(pl, &link_state);
 455                         break;
 456                 }
 457         }
 458
 459         if (link_state.link != netif_carrier_ok(ndev)) {
 460                 if (!link_state.link) {
 461                         netif_carrier_off(ndev);
 462                         pl->ops->mac_link_down(ndev, pl->link_an_mode);
 463                         netdev_info(ndev, "Link is Down\n");
 464                 } else {
 465                         pl->ops->mac_link_up(ndev, pl->link_an_mode,
 466                                              pl->phydev);
 467
 468                         netif_carrier_on(ndev);
 469
 470                         netdev_info(ndev,
 471                                     "Link is Up - %s/%s - flow control %s\n",
 472                                     phy_speed_to_str(link_state.speed),
 473                                     phy_duplex_to_str(link_state.duplex),
 474                                     phylink_pause_to_str(link_state.pause));
 475                 }
 476         }
 477         if (!link_state.link && pl->mac_link_dropped) {
 478                 pl->mac_link_dropped = false;
 479                 queue_work(system_power_efficient_wq, &pl->resolve);
 480         }
 481         mutex_unlock(&pl->state_mutex);
 482 }
 483
 484 static void phylink_run_resolve(struct phylink *pl)
 485 {
 486         if (!pl->phylink_disable_state)
 487                 queue_work(system_power_efficient_wq, &pl->resolve);
 488 }
 489
 490 static const struct sfp_upstream_ops sfp_phylink_ops;
 491
 492 static int phylink_register_sfp(struct phylink *pl, struct device_node *np)
 493 {
 494         struct device_node *sfp_np;
 495
 496         sfp_np = of_parse_phandle(np, "sfp", 0);
 497         if (!sfp_np)
 498                 return 0;
 499
 500         pl->sfp_bus = sfp_register_upstream(sfp_np, pl->netdev, pl,
 501                                             &sfp_phylink_ops);
 502         if (!pl->sfp_bus)
 503                 return -ENOMEM;
 504
 505         return 0;
 506 }
 507
 508 struct phylink *phylink_create(struct net_device *ndev, struct device_node *np,
 509         phy_interface_t iface, const struct phylink_mac_ops *ops)
 510 {
 511         struct phylink *pl;
 512         int ret;
 513
 514         pl = kzalloc(sizeof(*pl), GFP_KERNEL);
 515         if (!pl)
 516                 return ERR_PTR(-ENOMEM);
 517
 518         mutex_init(&pl->state_mutex);
 519         INIT_WORK(&pl->resolve, phylink_resolve);
 520         pl->netdev = ndev;
 521         pl->phy_state.interface = iface;
 522         pl->link_interface = iface;
 523         pl->link_port = PORT_MII;
 524         pl->link_config.interface = iface;
 525         pl->link_config.pause = MLO_PAUSE_AN;
 526         pl->link_config.speed = SPEED_UNKNOWN;
 527         pl->link_config.duplex = DUPLEX_UNKNOWN;
 528         pl->ops = ops;
 529         __set_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
 530
 531         bitmap_fill(pl->supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
 532         linkmode_copy(pl->link_config.advertising, pl->supported);
 533         phylink_validate(pl, pl->supported, &pl->link_config);
 534
 535         ret = phylink_parse_mode(pl, np);
 536         if (ret < 0) {
 537                 kfree(pl);
 538                 return ERR_PTR(ret);
 539         }
 540
 541         if (pl->link_an_mode == MLO_AN_FIXED) {
 542                 ret = phylink_parse_fixedlink(pl, np);
 543                 if (ret < 0) {
 544                         kfree(pl);
 545                         return ERR_PTR(ret);
 546                 }
 547         }
 548
 549         ret = phylink_register_sfp(pl, np);
 550         if (ret < 0) {
 551                 kfree(pl);
 552                 return ERR_PTR(ret);
 553         }
 554
 555         return pl;
 556 }
 557 EXPORT_SYMBOL_GPL(phylink_create);
 558
 559 void phylink_destroy(struct phylink *pl)
 560 {
 561         if (pl->sfp_bus)
 562                 sfp_unregister_upstream(pl->sfp_bus);
 563
 564         cancel_work_sync(&pl->resolve);
 565         kfree(pl);
 566 }
 567 EXPORT_SYMBOL_GPL(phylink_destroy);
 568
 569 void phylink_phy_change(struct phy_device *phydev, bool up, bool do_carrier)
 570 {
 571         struct phylink *pl = phydev->phylink;
 572
 573         mutex_lock(&pl->state_mutex);
 574         pl->phy_state.speed = phydev->speed;
 575         pl->phy_state.duplex = phydev->duplex;
 576         pl->phy_state.pause = MLO_PAUSE_NONE;
 577         if (phydev->pause)
 578                 pl->phy_state.pause |= MLO_PAUSE_SYM;
 579         if (phydev->asym_pause)
 580                 pl->phy_state.pause |= MLO_PAUSE_ASYM;
 581         pl->phy_state.interface = phydev->interface;
 582         pl->phy_state.link = up;
 583         mutex_unlock(&pl->state_mutex);
 584
 585         phylink_run_resolve(pl);
 586
 587         netdev_dbg(pl->netdev, "phy link %s %s/%s/%s\n", up ? "up" : "down",
 588                    phy_modes(phydev->interface),
 589                    phy_speed_to_str(phydev->speed),
 590                    phy_duplex_to_str(phydev->duplex));
 591 }
 592
 593 static int phylink_bringup_phy(struct phylink *pl, struct phy_device *phy)
 594 {
 595         struct phylink_link_state config;
 596         __ETHTOOL_DECLARE_LINK_MODE_MASK(supported);
 597         u32 advertising;
 598         int ret;
 599
 600         memset(&config, 0, sizeof(config));
 601         ethtool_convert_legacy_u32_to_link_mode(supported, phy->supported);
 602         ethtool_convert_legacy_u32_to_link_mode(config.advertising,
 603                                                 phy->advertising);
 604         config.interface = pl->link_config.interface;
 605
 606         /*
 607          * This is the new way of dealing with flow control for PHYs,
 608          * as described by Timur Tabi in commit 529ed1275263 ("net: phy:
 609          * phy drivers should not set SUPPORTED_[Asym_]Pause") except
 610          * using our validate call to the MAC, we rely upon the MAC
 611          * clearing the bits from both supported and advertising fields.
 612          */
 613         if (phylink_test(supported, Pause))
 614                 phylink_set(config.advertising, Pause);
 615         if (phylink_test(supported, Asym_Pause))
 616                 phylink_set(config.advertising, Asym_Pause);
 617
 618         ret = phylink_validate(pl, supported, &config);
 619         if (ret)
 620                 return ret;
 621
 622         phy->phylink = pl;
 623         phy->phy_link_change = phylink_phy_change;
 624
 625         netdev_info(pl->netdev,
 626                     "PHY [%s] driver [%s]\n", dev_name(&phy->mdio.dev),
 627                     phy->drv->name);
 628
 629         mutex_lock(&phy->lock);
 630         mutex_lock(&pl->state_mutex);
 631         pl->netdev->phydev = phy;
 632         pl->phydev = phy;
 633         linkmode_copy(pl->supported, supported);
 634         linkmode_copy(pl->link_config.advertising, config.advertising);
 635
 636         /* Restrict the phy advertisment according to the MAC support. */
 637         ethtool_convert_link_mode_to_legacy_u32(&advertising, config.advertising);
 638         phy->advertising = advertising;
 639         mutex_unlock(&pl->state_mutex);
 640         mutex_unlock(&phy->lock);
 641
 642         netdev_dbg(pl->netdev,
 643                    "phy: setting supported %*pb advertising 0x%08x\n",
 644                    __ETHTOOL_LINK_MODE_MASK_NBITS, pl->supported,
 645                    phy->advertising);
 646
 647         phy_start_machine(phy);
 648         if (phy->irq > 0)
 649                 phy_start_interrupts(phy);
 650
 651         return 0;
 652 }
 653
 654 int phylink_connect_phy(struct phylink *pl, struct phy_device *phy)
 655 {
 656         int ret;
 657
 658         ret = phy_attach_direct(pl->netdev, phy, 0, pl->link_interface);
 659         if (ret)
 660                 return ret;
 661
 662         ret = phylink_bringup_phy(pl, phy);
 663         if (ret)
 664                 phy_detach(phy);
 665
 666         return ret;
 667 }
 668 EXPORT_SYMBOL_GPL(phylink_connect_phy);
 669
 670 int phylink_of_phy_connect(struct phylink *pl, struct device_node *dn)
 671 {
 672         struct device_node *phy_node;
 673         struct phy_device *phy_dev;
 674         int ret;
 675
 676         /* Fixed links are handled without needing a PHY */
 677         if (pl->link_an_mode == MLO_AN_FIXED)
 678                 return 0;
 679
 680         phy_node = of_parse_phandle(dn, "phy-handle", 0);
 681         if (!phy_node)
 682                 phy_node = of_parse_phandle(dn, "phy", 0);
 683         if (!phy_node)
 684                 phy_node = of_parse_phandle(dn, "phy-device", 0);
 685
 686         if (!phy_node) {
 687                 if (pl->link_an_mode == MLO_AN_PHY) {
 688                         netdev_err(pl->netdev, "unable to find PHY node\n");
 689                         return -ENODEV;
 690                 }
 691                 return 0;
 692         }
 693
 694         phy_dev = of_phy_attach(pl->netdev, phy_node, 0, pl->link_interface);
 695         /* We're done with the phy_node handle */
 696         of_node_put(phy_node);
 697
 698         if (!phy_dev)
 699                 return -ENODEV;
 700
 701         ret = phylink_bringup_phy(pl, phy_dev);
 702         if (ret)
 703                 phy_detach(phy_dev);
 704
 705         return ret;
 706 }
 707 EXPORT_SYMBOL_GPL(phylink_of_phy_connect);
 708
 709 void phylink_disconnect_phy(struct phylink *pl)
 710 {
 711         struct phy_device *phy;
 712
 713         WARN_ON(!lockdep_rtnl_is_held());
 714
 715         phy = pl->phydev;
 716         if (phy) {
 717                 mutex_lock(&phy->lock);
 718                 mutex_lock(&pl->state_mutex);
 719                 pl->netdev->phydev = NULL;
 720                 pl->phydev = NULL;
 721                 mutex_unlock(&pl->state_mutex);
 722                 mutex_unlock(&phy->lock);
 723                 flush_work(&pl->resolve);
 724
 725                 phy_disconnect(phy);
 726         }
 727 }
 728 EXPORT_SYMBOL_GPL(phylink_disconnect_phy);
 729
 730 void phylink_mac_change(struct phylink *pl, bool up)
 731 {
 732         if (!up)
 733                 pl->mac_link_dropped = true;
 734         phylink_run_resolve(pl);
 735         netdev_dbg(pl->netdev, "mac link %s\n", up ? "up" : "down");
 736 }
 737 EXPORT_SYMBOL_GPL(phylink_mac_change);
 738
 739 void phylink_start(struct phylink *pl)
 740 {
 741         WARN_ON(!lockdep_rtnl_is_held());
 742
 743         netdev_info(pl->netdev, "configuring for %s/%s link mode\n",
 744                     phylink_an_mode_str(pl->link_an_mode),
 745                     phy_modes(pl->link_config.interface));
 746
 747         /* Apply the link configuration to the MAC when starting. This allows
 748          * a fixed-link to start with the correct parameters, and also
 749          * ensures that we set the appropriate advertisment for Serdes links.
 750          */
 751         phylink_resolve_flow(pl, &pl->link_config);
 752         phylink_mac_config(pl, &pl->link_config);
 753
 754         clear_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
 755         phylink_run_resolve(pl);
 756
 757         if (pl->sfp_bus)
 758                 sfp_upstream_start(pl->sfp_bus);
 759         if (pl->phydev)
 760                 phy_start(pl->phydev);
 761 }
 762 EXPORT_SYMBOL_GPL(phylink_start);
 763
 764 void phylink_stop(struct phylink *pl)
 765 {
 766         WARN_ON(!lockdep_rtnl_is_held());
 767
 768         if (pl->phydev)
 769                 phy_stop(pl->phydev);
 770         if (pl->sfp_bus)
 771                 sfp_upstream_stop(pl->sfp_bus);
 772
 773         set_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
 774         flush_work(&pl->resolve);
 775 }
 776 EXPORT_SYMBOL_GPL(phylink_stop);
 777
 778 void phylink_ethtool_get_wol(struct phylink *pl, struct ethtool_wolinfo *wol)
 779 {
 780         WARN_ON(!lockdep_rtnl_is_held());
 781
 782         wol->supported = 0;
 783         wol->wolopts = 0;
 784
 785         if (pl->phydev)
 786                 phy_ethtool_get_wol(pl->phydev, wol);
 787 }
 788 EXPORT_SYMBOL_GPL(phylink_ethtool_get_wol);
 789
 790 int phylink_ethtool_set_wol(struct phylink *pl, struct ethtool_wolinfo *wol)
 791 {
 792         int ret = -EOPNOTSUPP;
 793
 794         WARN_ON(!lockdep_rtnl_is_held());
 795
 796         if (pl->phydev)
 797                 ret = phy_ethtool_set_wol(pl->phydev, wol);
 798
 799         return ret;
 800 }
 801 EXPORT_SYMBOL_GPL(phylink_ethtool_set_wol);
 802
 803 static void phylink_merge_link_mode(unsigned long *dst, const unsigned long *b)
 804 {
 805         __ETHTOOL_DECLARE_LINK_MODE_MASK(mask);
 806
 807         linkmode_zero(mask);
 808         phylink_set_port_modes(mask);
 809
 810         linkmode_and(dst, dst, mask);
 811         linkmode_or(dst, dst, b);
 812 }
 813
 814 static void phylink_get_ksettings(const struct phylink_link_state *state,
 815                                   struct ethtool_link_ksettings *kset)
 816 {
 817         phylink_merge_link_mode(kset->link_modes.advertising, state->advertising);
 818         linkmode_copy(kset->link_modes.lp_advertising, state->lp_advertising);
 819         kset->base.speed = state->speed;
 820         kset->base.duplex = state->duplex;
 821         kset->base.autoneg = state->an_enabled ? AUTONEG_ENABLE :
 822                                 AUTONEG_DISABLE;
 823 }
 824
 825 int phylink_ethtool_ksettings_get(struct phylink *pl,
 826         struct ethtool_link_ksettings *kset)
 827 {
 828         struct phylink_link_state link_state;
 829
 830         WARN_ON(!lockdep_rtnl_is_held());
 831
 832         if (pl->phydev) {
 833                 phy_ethtool_ksettings_get(pl->phydev, kset);
 834         } else {
 835                 kset->base.port = pl->link_port;
 836         }
 837
 838         linkmode_copy(kset->link_modes.supported, pl->supported);
 839
 840         switch (pl->link_an_mode) {
 841         case MLO_AN_FIXED:
 842                 /* We are using fixed settings. Report these as the
 843                  * current link settings - and note that these also
 844                  * represent the supported speeds/duplex/pause modes.
 845                  */
 846                 phylink_get_fixed_state(pl, &link_state);
 847                 phylink_get_ksettings(&link_state, kset);
 848                 break;
 849
 850         case MLO_AN_SGMII:
 851                 /* If there is a phy attached, then use the reported
 852                  * settings from the phy with no modification.
 853                  */
 854                 if (pl->phydev)
 855                         break;
 856
 857         case MLO_AN_8023Z:
 858                 phylink_get_mac_state(pl, &link_state);
 859
 860                 /* The MAC is reporting the link results from its own PCS
 861                  * layer via in-band status. Report these as the current
 862                  * link settings.
 863                  */
 864                 phylink_get_ksettings(&link_state, kset);
 865                 break;
 866         }
 867
 868         return 0;
 869 }
 870 EXPORT_SYMBOL_GPL(phylink_ethtool_ksettings_get);
 871
 872 int phylink_ethtool_ksettings_set(struct phylink *pl,
 873         const struct ethtool_link_ksettings *kset)
 874 {
 875         struct ethtool_link_ksettings our_kset;
 876         struct phylink_link_state config;
 877         int ret;
 878
 879         WARN_ON(!lockdep_rtnl_is_held());
 880
 881         if (kset->base.autoneg != AUTONEG_DISABLE &&
 882             kset->base.autoneg != AUTONEG_ENABLE)
 883                 return -EINVAL;
 884
 885         config = pl->link_config;
 886
 887         /* Mask out unsupported advertisments */
 888         linkmode_and(config.advertising, kset->link_modes.advertising,
 889                      pl->supported);
 890
 891         /* FIXME: should we reject autoneg if phy/mac does not support it? */
 892         if (kset->base.autoneg == AUTONEG_DISABLE) {
 893                 const struct phy_setting *s;
 894
 895                 /* Autonegotiation disabled, select a suitable speed and
 896                  * duplex.
 897                  */
 898                 s = phy_lookup_setting(kset->base.speed, kset->base.duplex,
 899                                        pl->supported,
 900                                        __ETHTOOL_LINK_MODE_MASK_NBITS, false);
 901                 if (!s)
 902                         return -EINVAL;
 903
 904                 /* If we have a fixed link (as specified by firmware), refuse
 905                  * to change link parameters.
 906                  */
 907                 if (pl->link_an_mode == MLO_AN_FIXED &&
 908                     (s->speed != pl->link_config.speed ||
 909                      s->duplex != pl->link_config.duplex))
 910                         return -EINVAL;
 911
 912                 config.speed = s->speed;
 913                 config.duplex = s->duplex;
 914                 config.an_enabled = false;
 915
 916                 __clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, config.advertising);
 917         } else {
 918                 /* If we have a fixed link, refuse to enable autonegotiation */
 919                 if (pl->link_an_mode == MLO_AN_FIXED)
 920                         return -EINVAL;
 921
 922                 config.speed = SPEED_UNKNOWN;
 923                 config.duplex = DUPLEX_UNKNOWN;
 924                 config.an_enabled = true;
 925
 926                 __set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, config.advertising);
 927         }
 928
 929         if (phylink_validate(pl, pl->supported, &config))
 930                 return -EINVAL;
 931
 932         /* If autonegotiation is enabled, we must have an advertisment */
 933         if (config.an_enabled && phylink_is_empty_linkmode(config.advertising))
 934                 return -EINVAL;
 935
 936         our_kset = *kset;
 937         linkmode_copy(our_kset.link_modes.advertising, config.advertising);
 938         our_kset.base.speed = config.speed;
 939         our_kset.base.duplex = config.duplex;
 940
 941         /* If we have a PHY, configure the phy */
 942         if (pl->phydev) {
 943                 ret = phy_ethtool_ksettings_set(pl->phydev, &our_kset);
 944                 if (ret)
 945                         return ret;
 946         }
 947
 948         mutex_lock(&pl->state_mutex);
 949         /* Configure the MAC to match the new settings */
 950         linkmode_copy(pl->link_config.advertising, our_kset.link_modes.advertising);
 951         pl->link_config.speed = our_kset.base.speed;
 952         pl->link_config.duplex = our_kset.base.duplex;
 953         pl->link_config.an_enabled = our_kset.base.autoneg != AUTONEG_DISABLE;
 954
 955         if (!test_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state)) {
 956                 phylink_mac_config(pl, &pl->link_config);
 957                 phylink_mac_an_restart(pl);
 958         }
 959         mutex_unlock(&pl->state_mutex);
 960
 961         return 0;
 962 }
 963 EXPORT_SYMBOL_GPL(phylink_ethtool_ksettings_set);
 964
 965 int phylink_ethtool_nway_reset(struct phylink *pl)
 966 {
 967         int ret = 0;
 968
 969         WARN_ON(!lockdep_rtnl_is_held());
 970
 971         if (pl->phydev)
 972                 ret = phy_restart_aneg(pl->phydev);
 973         phylink_mac_an_restart(pl);
 974
 975         return ret;
 976 }
 977 EXPORT_SYMBOL_GPL(phylink_ethtool_nway_reset);
 978
 979 void phylink_ethtool_get_pauseparam(struct phylink *pl,
 980                                     struct ethtool_pauseparam *pause)
 981 {
 982         WARN_ON(!lockdep_rtnl_is_held());
 983
 984         pause->autoneg = !!(pl->link_config.pause & MLO_PAUSE_AN);
 985         pause->rx_pause = !!(pl->link_config.pause & MLO_PAUSE_RX);
 986         pause->tx_pause = !!(pl->link_config.pause & MLO_PAUSE_TX);
 987 }
 988 EXPORT_SYMBOL_GPL(phylink_ethtool_get_pauseparam);
 989
 990 int phylink_ethtool_set_pauseparam(struct phylink *pl,
 991                                    struct ethtool_pauseparam *pause)
 992 {
 993         struct phylink_link_state *config = &pl->link_config;
 994
 995         WARN_ON(!lockdep_rtnl_is_held());
 996
 997         if (!phylink_test(pl->supported, Pause) &&
 998             !phylink_test(pl->supported, Asym_Pause))
 999                 return -EOPNOTSUPP;
1000
1001         if (!phylink_test(pl->supported, Asym_Pause) &&
1002             !pause->autoneg && pause->rx_pause != pause->tx_pause)
1003                 return -EINVAL;
1004
1005         config->pause &= ~(MLO_PAUSE_AN | MLO_PAUSE_TXRX_MASK);
1006
1007         if (pause->autoneg)
1008                 config->pause |= MLO_PAUSE_AN;
1009         if (pause->rx_pause)
1010                 config->pause |= MLO_PAUSE_RX;
1011         if (pause->tx_pause)
1012                 config->pause |= MLO_PAUSE_TX;
1013
1014         if (!test_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state)) {
1015                 switch (pl->link_an_mode) {
1016                 case MLO_AN_PHY:
1017                         /* Silently mark the carrier down, and then trigger a resolve */
1018                         netif_carrier_off(pl->netdev);
1019                         phylink_run_resolve(pl);
1020                         break;
1021
1022                 case MLO_AN_FIXED:
1023                         /* Should we allow fixed links to change against the config? */
1024                         phylink_resolve_flow(pl, config);
1025                         phylink_mac_config(pl, config);
1026                         break;
1027
1028                 case MLO_AN_SGMII:
1029                 case MLO_AN_8023Z:
1030                         phylink_mac_config(pl, config);
1031                         phylink_mac_an_restart(pl);
1032                         break;
1033                 }
1034         }
1035
1036         return 0;
1037 }
1038 EXPORT_SYMBOL_GPL(phylink_ethtool_set_pauseparam);
1039
1040 int phylink_ethtool_get_module_info(struct phylink *pl,
1041                                     struct ethtool_modinfo *modinfo)
1042 {
1043         int ret = -EOPNOTSUPP;
1044
1045         WARN_ON(!lockdep_rtnl_is_held());
1046
1047         if (pl->sfp_bus)
1048                 ret = sfp_get_module_info(pl->sfp_bus, modinfo);
1049
1050         return ret;
1051 }
1052 EXPORT_SYMBOL_GPL(phylink_ethtool_get_module_info);
1053
1054 int phylink_ethtool_get_module_eeprom(struct phylink *pl,
1055                                       struct ethtool_eeprom *ee, u8 *buf)
1056 {
1057         int ret = -EOPNOTSUPP;
1058
1059         WARN_ON(!lockdep_rtnl_is_held());
1060
1061         if (pl->sfp_bus)
1062                 ret = sfp_get_module_eeprom(pl->sfp_bus, ee, buf);
1063
1064         return ret;
1065 }
1066 EXPORT_SYMBOL_GPL(phylink_ethtool_get_module_eeprom);
1067
1068 int phylink_init_eee(struct phylink *pl, bool clk_stop_enable)
1069 {
1070         int ret = -EPROTONOSUPPORT;
1071
1072         WARN_ON(!lockdep_rtnl_is_held());
1073
1074         if (pl->phydev)
1075                 ret = phy_init_eee(pl->phydev, clk_stop_enable);
1076
1077         return ret;
1078 }
1079 EXPORT_SYMBOL_GPL(phylink_init_eee);
1080
1081 int phylink_get_eee_err(struct phylink *pl)
1082 {
1083         int ret = 0;
1084
1085         WARN_ON(!lockdep_rtnl_is_held());
1086
1087         if (pl->phydev)
1088                 ret = phy_get_eee_err(pl->phydev);
1089
1090         return ret;
1091 }
1092 EXPORT_SYMBOL_GPL(phylink_get_eee_err);
1093
1094 int phylink_ethtool_get_eee(struct phylink *pl, struct ethtool_eee *eee)
1095 {
1096         int ret = -EOPNOTSUPP;
1097
1098         WARN_ON(!lockdep_rtnl_is_held());
1099
1100         if (pl->phydev)
1101                 ret = phy_ethtool_get_eee(pl->phydev, eee);
1102
1103         return ret;
1104 }
1105 EXPORT_SYMBOL_GPL(phylink_ethtool_get_eee);
1106
1107 int phylink_ethtool_set_eee(struct phylink *pl, struct ethtool_eee *eee)
1108 {
1109         int ret = -EOPNOTSUPP;
1110
1111         WARN_ON(!lockdep_rtnl_is_held());
1112
1113         if (pl->phydev)
1114                 ret = phy_ethtool_set_eee(pl->phydev, eee);
1115
1116         return ret;
1117 }
1118 EXPORT_SYMBOL_GPL(phylink_ethtool_set_eee);
1119
1120 /* This emulates MII registers for a fixed-mode phy operating as per the
1121  * passed in state. "aneg" defines if we report negotiation is possible.
1122  *
1123  * FIXME: should deal with negotiation state too.
1124  */
1125 static int phylink_mii_emul_read(struct net_device *ndev, unsigned int reg,
1126                                  struct phylink_link_state *state, bool aneg)
1127 {
1128         struct fixed_phy_status fs;
1129         int val;
1130
1131         fs.link = state->link;
1132         fs.speed = state->speed;
1133         fs.duplex = state->duplex;
1134         fs.pause = state->pause & MLO_PAUSE_SYM;
1135         fs.asym_pause = state->pause & MLO_PAUSE_ASYM;
1136
1137         val = swphy_read_reg(reg, &fs);
1138         if (reg == MII_BMSR) {
1139                 if (!state->an_complete)
1140                         val &= ~BMSR_ANEGCOMPLETE;
1141                 if (!aneg)
1142                         val &= ~BMSR_ANEGCAPABLE;
1143         }
1144         return val;
1145 }
1146
1147 static int phylink_phy_read(struct phylink *pl, unsigned int phy_id,
1148                             unsigned int reg)
1149 {
1150         struct phy_device *phydev = pl->phydev;
1151         int prtad, devad;
1152
1153         if (mdio_phy_id_is_c45(phy_id)) {
1154                 prtad = mdio_phy_id_prtad(phy_id);
1155                 devad = mdio_phy_id_devad(phy_id);
1156                 devad = MII_ADDR_C45 | devad << 16 | reg;
1157         } else if (phydev->is_c45) {
1158                 switch (reg) {
1159                 case MII_BMCR:
1160                 case MII_BMSR:
1161                 case MII_PHYSID1:
1162                 case MII_PHYSID2:
1163                         devad = __ffs(phydev->c45_ids.devices_in_package);
1164                         break;
1165                 case MII_ADVERTISE:
1166                 case MII_LPA:
1167                         if (!(phydev->c45_ids.devices_in_package & MDIO_DEVS_AN))
1168                                 return -EINVAL;
1169                         devad = MDIO_MMD_AN;
1170                         if (reg == MII_ADVERTISE)
1171                                 reg = MDIO_AN_ADVERTISE;
1172                         else
1173                                 reg = MDIO_AN_LPA;
1174                         break;
1175                 default:
1176                         return -EINVAL;
1177                 }
1178                 prtad = phy_id;
1179                 devad = MII_ADDR_C45 | devad << 16 | reg;
1180         } else {
1181                 prtad = phy_id;
1182                 devad = reg;
1183         }
1184         return mdiobus_read(pl->phydev->mdio.bus, prtad, devad);
1185 }
1186
1187 static int phylink_phy_write(struct phylink *pl, unsigned int phy_id,
1188                              unsigned int reg, unsigned int val)
1189 {
1190         struct phy_device *phydev = pl->phydev;
1191         int prtad, devad;
1192
1193         if (mdio_phy_id_is_c45(phy_id)) {
1194                 prtad = mdio_phy_id_prtad(phy_id);
1195                 devad = mdio_phy_id_devad(phy_id);
1196                 devad = MII_ADDR_C45 | devad << 16 | reg;
1197         } else if (phydev->is_c45) {
1198                 switch (reg) {
1199                 case MII_BMCR:
1200                 case MII_BMSR:
1201                 case MII_PHYSID1:
1202                 case MII_PHYSID2:
1203                         devad = __ffs(phydev->c45_ids.devices_in_package);
1204                         break;
1205                 case MII_ADVERTISE:
1206                 case MII_LPA:
1207                         if (!(phydev->c45_ids.devices_in_package & MDIO_DEVS_AN))
1208                                 return -EINVAL;
1209                         devad = MDIO_MMD_AN;
1210                         if (reg == MII_ADVERTISE)
1211                                 reg = MDIO_AN_ADVERTISE;
1212                         else
1213                                 reg = MDIO_AN_LPA;
1214                         break;
1215                 default:
1216                         return -EINVAL;
1217                 }
1218                 prtad = phy_id;
1219                 devad = MII_ADDR_C45 | devad << 16 | reg;
1220         } else {
1221                 prtad = phy_id;
1222                 devad = reg;
1223         }
1224
1225         return mdiobus_write(phydev->mdio.bus, prtad, devad, val);
1226 }
1227
1228 static int phylink_mii_read(struct phylink *pl, unsigned int phy_id,
1229                             unsigned int reg)
1230 {
1231         struct phylink_link_state state;
1232         int val = 0xffff;
1233
1234         switch (pl->link_an_mode) {
1235         case MLO_AN_FIXED:
1236                 if (phy_id == 0) {
1237                         phylink_get_fixed_state(pl, &state);
1238                         val = phylink_mii_emul_read(pl->netdev, reg, &state,
1239                                                     true);
1240                 }
1241                 break;
1242
1243         case MLO_AN_PHY:
1244                 return -EOPNOTSUPP;
1245
1246         case MLO_AN_SGMII:
1247                 /* No phy, fall through to 8023z method */
1248         case MLO_AN_8023Z:
1249                 if (phy_id == 0) {
1250                         val = phylink_get_mac_state(pl, &state);
1251                         if (val < 0)
1252                                 return val;
1253
1254                         val = phylink_mii_emul_read(pl->netdev, reg, &state,
1255                                                     true);
1256                 }
1257                 break;
1258         }
1259
1260         return val & 0xffff;
1261 }
1262
1263 static int phylink_mii_write(struct phylink *pl, unsigned int phy_id,
1264                              unsigned int reg, unsigned int val)
1265 {
1266         switch (pl->link_an_mode) {
1267         case MLO_AN_FIXED:
1268                 break;
1269
1270         case MLO_AN_PHY:
1271                 return -EOPNOTSUPP;
1272
1273         case MLO_AN_SGMII:
1274                 /* No phy, fall through to 8023z method */
1275         case MLO_AN_8023Z:
1276                 break;
1277         }
1278
1279         return 0;
1280 }
1281
1282 int phylink_mii_ioctl(struct phylink *pl, struct ifreq *ifr, int cmd)
1283 {
1284         struct mii_ioctl_data *mii = if_mii(ifr);
1285         int  ret;
1286
1287         WARN_ON(!lockdep_rtnl_is_held());
1288
1289         if (pl->phydev) {
1290                 /* PHYs only exist for MLO_AN_PHY and MLO_AN_SGMII */
1291                 switch (cmd) {
1292                 case SIOCGMIIPHY:
1293                         mii->phy_id = pl->phydev->mdio.addr;
1294
1295                 case SIOCGMIIREG:
1296                         ret = phylink_phy_read(pl, mii->phy_id, mii->reg_num);
1297                         if (ret >= 0) {
1298                                 mii->val_out = ret;
1299                                 ret = 0;
1300                         }
1301                         break;
1302
1303                 case SIOCSMIIREG:
1304                         ret = phylink_phy_write(pl, mii->phy_id, mii->reg_num,
1305                                                 mii->val_in);
1306                         break;
1307
1308                 default:
1309                         ret = phy_mii_ioctl(pl->phydev, ifr, cmd);
1310                         break;
1311                 }
1312         } else {
1313                 switch (cmd) {
1314                 case SIOCGMIIPHY:
1315                         mii->phy_id = 0;
1316
1317                 case SIOCGMIIREG:
1318                         ret = phylink_mii_read(pl, mii->phy_id, mii->reg_num);
1319                         if (ret >= 0) {
1320                                 mii->val_out = ret;
1321                                 ret = 0;
1322                         }
1323                         break;
1324
1325                 case SIOCSMIIREG:
1326                         ret = phylink_mii_write(pl, mii->phy_id, mii->reg_num,
1327                                                 mii->val_in);
1328                         break;
1329
1330                 default:
1331                         ret = -EOPNOTSUPP;
1332                         break;
1333                 }
1334         }
1335
1336         return ret;
1337 }
1338 EXPORT_SYMBOL_GPL(phylink_mii_ioctl);
1339
1340
1341
1342 static int phylink_sfp_module_insert(void *upstream,
1343                                      const struct sfp_eeprom_id *id)
1344 {
1345         struct phylink *pl = upstream;
1346         __ETHTOOL_DECLARE_LINK_MODE_MASK(support) = { 0, };
1347         struct phylink_link_state config;
1348         phy_interface_t iface;
1349         int mode, ret = 0;
1350         bool changed;
1351         u8 port;
1352
1353         sfp_parse_support(pl->sfp_bus, id, support);
1354         port = sfp_parse_port(pl->sfp_bus, id, support);
1355         iface = sfp_parse_interface(pl->sfp_bus, id);
1356
1357         WARN_ON(!lockdep_rtnl_is_held());
1358
1359         switch (iface) {
1360         case PHY_INTERFACE_MODE_SGMII:
1361                 mode = MLO_AN_SGMII;
1362                 break;
1363         case PHY_INTERFACE_MODE_1000BASEX:
1364                 mode = MLO_AN_8023Z;
1365                 break;
1366         default:
1367                 return -EINVAL;
1368         }
1369
1370         memset(&config, 0, sizeof(config));
1371         linkmode_copy(config.advertising, support);
1372         config.interface = iface;
1373         config.speed = SPEED_UNKNOWN;
1374         config.duplex = DUPLEX_UNKNOWN;
1375         config.pause = MLO_PAUSE_AN;
1376         config.an_enabled = pl->link_config.an_enabled;
1377
1378         /* Ignore errors if we're expecting a PHY to attach later */
1379         ret = phylink_validate(pl, support, &config);
1380         if (ret) {
1381                 netdev_err(pl->netdev, "validation of %s/%s with support %*pb failed: %d\n",
1382                            phylink_an_mode_str(mode), phy_modes(config.interface),
1383                            __ETHTOOL_LINK_MODE_MASK_NBITS, support, ret);
1384                 return ret;
1385         }
1386
1387         netdev_dbg(pl->netdev, "requesting link mode %s/%s with support %*pb\n",
1388                    phylink_an_mode_str(mode), phy_modes(config.interface),
1389                    __ETHTOOL_LINK_MODE_MASK_NBITS, support);
1390
1391         if (mode == MLO_AN_8023Z && pl->phydev)
1392                 return -EINVAL;
1393
1394         changed = !bitmap_equal(pl->supported, support,
1395                                 __ETHTOOL_LINK_MODE_MASK_NBITS);
1396         if (changed) {
1397                 linkmode_copy(pl->supported, support);
1398                 linkmode_copy(pl->link_config.advertising, config.advertising);
1399         }
1400
1401         if (pl->link_an_mode != mode ||
1402             pl->link_config.interface != config.interface) {
1403                 pl->link_config.interface = config.interface;
1404                 pl->link_an_mode = mode;
1405
1406                 changed = true;
1407
1408                 netdev_info(pl->netdev, "switched to %s/%s link mode\n",
1409                             phylink_an_mode_str(mode),
1410                             phy_modes(config.interface));
1411         }
1412
1413         pl->link_port = port;
1414
1415         if (changed && !test_bit(PHYLINK_DISABLE_STOPPED,
1416                                  &pl->phylink_disable_state))
1417                 phylink_mac_config(pl, &pl->link_config);
1418
1419         return ret;
1420 }
1421
1422 static void phylink_sfp_link_down(void *upstream)
1423 {
1424         struct phylink *pl = upstream;
1425
1426         WARN_ON(!lockdep_rtnl_is_held());
1427
1428         set_bit(PHYLINK_DISABLE_LINK, &pl->phylink_disable_state);
1429         flush_work(&pl->resolve);
1430
1431         netif_carrier_off(pl->netdev);
1432 }
1433
1434 static void phylink_sfp_link_up(void *upstream)
1435 {
1436         struct phylink *pl = upstream;
1437
1438         WARN_ON(!lockdep_rtnl_is_held());
1439
1440         clear_bit(PHYLINK_DISABLE_LINK, &pl->phylink_disable_state);
1441         phylink_run_resolve(pl);
1442 }
1443
1444 static int phylink_sfp_connect_phy(void *upstream, struct phy_device *phy)
1445 {
1446         return phylink_connect_phy(upstream, phy);
1447 }
1448
1449 static void phylink_sfp_disconnect_phy(void *upstream)
1450 {
1451         phylink_disconnect_phy(upstream);
1452 }
1453
1454 static const struct sfp_upstream_ops sfp_phylink_ops = {
1455         .module_insert = phylink_sfp_module_insert,
1456         .link_up = phylink_sfp_link_up,
1457         .link_down = phylink_sfp_link_down,
1458         .connect_phy = phylink_sfp_connect_phy,
1459         .disconnect_phy = phylink_sfp_disconnect_phy,
1460 };
1461
1462 MODULE_LICENSE("GPL");