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,
 510                                const struct phylink_mac_ops *ops)
 511 {
 512         struct phylink *pl;
 513         int ret;
 514
 515         pl = kzalloc(sizeof(*pl), GFP_KERNEL);
 516         if (!pl)
 517                 return ERR_PTR(-ENOMEM);
 518
 519         mutex_init(&pl->state_mutex);
 520         INIT_WORK(&pl->resolve, phylink_resolve);
 521         pl->netdev = ndev;
 522         pl->phy_state.interface = iface;
 523         pl->link_interface = iface;
 524         pl->link_port = PORT_MII;
 525         pl->link_config.interface = iface;
 526         pl->link_config.pause = MLO_PAUSE_AN;
 527         pl->link_config.speed = SPEED_UNKNOWN;
 528         pl->link_config.duplex = DUPLEX_UNKNOWN;
 529         pl->link_config.an_enabled = true;
 530         pl->ops = ops;
 531         __set_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
 532
 533         bitmap_fill(pl->supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
 534         linkmode_copy(pl->link_config.advertising, pl->supported);
 535         phylink_validate(pl, pl->supported, &pl->link_config);
 536
 537         ret = phylink_parse_mode(pl, np);
 538         if (ret < 0) {
 539                 kfree(pl);
 540                 return ERR_PTR(ret);
 541         }
 542
 543         if (pl->link_an_mode == MLO_AN_FIXED) {
 544                 ret = phylink_parse_fixedlink(pl, np);
 545                 if (ret < 0) {
 546                         kfree(pl);
 547                         return ERR_PTR(ret);
 548                 }
 549         }
 550
 551         ret = phylink_register_sfp(pl, np);
 552         if (ret < 0) {
 553                 kfree(pl);
 554                 return ERR_PTR(ret);
 555         }
 556
 557         return pl;
 558 }
 559 EXPORT_SYMBOL_GPL(phylink_create);
 560
 561 void phylink_destroy(struct phylink *pl)
 562 {
 563         if (pl->sfp_bus)
 564                 sfp_unregister_upstream(pl->sfp_bus);
 565
 566         cancel_work_sync(&pl->resolve);
 567         kfree(pl);
 568 }
 569 EXPORT_SYMBOL_GPL(phylink_destroy);
 570
 571 static void phylink_phy_change(struct phy_device *phydev, bool up,
 572                                bool do_carrier)
 573 {
 574         struct phylink *pl = phydev->phylink;
 575
 576         mutex_lock(&pl->state_mutex);
 577         pl->phy_state.speed = phydev->speed;
 578         pl->phy_state.duplex = phydev->duplex;
 579         pl->phy_state.pause = MLO_PAUSE_NONE;
 580         if (phydev->pause)
 581                 pl->phy_state.pause |= MLO_PAUSE_SYM;
 582         if (phydev->asym_pause)
 583                 pl->phy_state.pause |= MLO_PAUSE_ASYM;
 584         pl->phy_state.interface = phydev->interface;
 585         pl->phy_state.link = up;
 586         mutex_unlock(&pl->state_mutex);
 587
 588         phylink_run_resolve(pl);
 589
 590         netdev_dbg(pl->netdev, "phy link %s %s/%s/%s\n", up ? "up" : "down",
 591                    phy_modes(phydev->interface),
 592                    phy_speed_to_str(phydev->speed),
 593                    phy_duplex_to_str(phydev->duplex));
 594 }
 595
 596 static int phylink_bringup_phy(struct phylink *pl, struct phy_device *phy)
 597 {
 598         struct phylink_link_state config;
 599         __ETHTOOL_DECLARE_LINK_MODE_MASK(supported);
 600         u32 advertising;
 601         int ret;
 602
 603         memset(&config, 0, sizeof(config));
 604         ethtool_convert_legacy_u32_to_link_mode(supported, phy->supported);
 605         ethtool_convert_legacy_u32_to_link_mode(config.advertising,
 606                                                 phy->advertising);
 607         config.interface = pl->link_config.interface;
 608
 609         /*
 610          * This is the new way of dealing with flow control for PHYs,
 611          * as described by Timur Tabi in commit 529ed1275263 ("net: phy:
 612          * phy drivers should not set SUPPORTED_[Asym_]Pause") except
 613          * using our validate call to the MAC, we rely upon the MAC
 614          * clearing the bits from both supported and advertising fields.
 615          */
 616         if (phylink_test(supported, Pause))
 617                 phylink_set(config.advertising, Pause);
 618         if (phylink_test(supported, Asym_Pause))
 619                 phylink_set(config.advertising, Asym_Pause);
 620
 621         ret = phylink_validate(pl, supported, &config);
 622         if (ret)
 623                 return ret;
 624
 625         phy->phylink = pl;
 626         phy->phy_link_change = phylink_phy_change;
 627
 628         netdev_info(pl->netdev,
 629                     "PHY [%s] driver [%s]\n", dev_name(&phy->mdio.dev),
 630                     phy->drv->name);
 631
 632         mutex_lock(&phy->lock);
 633         mutex_lock(&pl->state_mutex);
 634         pl->netdev->phydev = phy;
 635         pl->phydev = phy;
 636         linkmode_copy(pl->supported, supported);
 637         linkmode_copy(pl->link_config.advertising, config.advertising);
 638
 639         /* Restrict the phy advertisment according to the MAC support. */
 640         ethtool_convert_link_mode_to_legacy_u32(&advertising, config.advertising);
 641         phy->advertising = advertising;
 642         mutex_unlock(&pl->state_mutex);
 643         mutex_unlock(&phy->lock);
 644
 645         netdev_dbg(pl->netdev,
 646                    "phy: setting supported %*pb advertising 0x%08x\n",
 647                    __ETHTOOL_LINK_MODE_MASK_NBITS, pl->supported,
 648                    phy->advertising);
 649
 650         phy_start_machine(phy);
 651         if (phy->irq > 0)
 652                 phy_start_interrupts(phy);
 653
 654         return 0;
 655 }
 656
 657 int phylink_connect_phy(struct phylink *pl, struct phy_device *phy)
 658 {
 659         int ret;
 660
 661         ret = phy_attach_direct(pl->netdev, phy, 0, pl->link_interface);
 662         if (ret)
 663                 return ret;
 664
 665         ret = phylink_bringup_phy(pl, phy);
 666         if (ret)
 667                 phy_detach(phy);
 668
 669         return ret;
 670 }
 671 EXPORT_SYMBOL_GPL(phylink_connect_phy);
 672
 673 int phylink_of_phy_connect(struct phylink *pl, struct device_node *dn)
 674 {
 675         struct device_node *phy_node;
 676         struct phy_device *phy_dev;
 677         int ret;
 678
 679         /* Fixed links are handled without needing a PHY */
 680         if (pl->link_an_mode == MLO_AN_FIXED)
 681                 return 0;
 682
 683         phy_node = of_parse_phandle(dn, "phy-handle", 0);
 684         if (!phy_node)
 685                 phy_node = of_parse_phandle(dn, "phy", 0);
 686         if (!phy_node)
 687                 phy_node = of_parse_phandle(dn, "phy-device", 0);
 688
 689         if (!phy_node) {
 690                 if (pl->link_an_mode == MLO_AN_PHY) {
 691                         netdev_err(pl->netdev, "unable to find PHY node\n");
 692                         return -ENODEV;
 693                 }
 694                 return 0;
 695         }
 696
 697         phy_dev = of_phy_attach(pl->netdev, phy_node, 0, pl->link_interface);
 698         /* We're done with the phy_node handle */
 699         of_node_put(phy_node);
 700
 701         if (!phy_dev)
 702                 return -ENODEV;
 703
 704         ret = phylink_bringup_phy(pl, phy_dev);
 705         if (ret)
 706                 phy_detach(phy_dev);
 707
 708         return ret;
 709 }
 710 EXPORT_SYMBOL_GPL(phylink_of_phy_connect);
 711
 712 void phylink_disconnect_phy(struct phylink *pl)
 713 {
 714         struct phy_device *phy;
 715
 716         WARN_ON(!lockdep_rtnl_is_held());
 717
 718         phy = pl->phydev;
 719         if (phy) {
 720                 mutex_lock(&phy->lock);
 721                 mutex_lock(&pl->state_mutex);
 722                 pl->netdev->phydev = NULL;
 723                 pl->phydev = NULL;
 724                 mutex_unlock(&pl->state_mutex);
 725                 mutex_unlock(&phy->lock);
 726                 flush_work(&pl->resolve);
 727
 728                 phy_disconnect(phy);
 729         }
 730 }
 731 EXPORT_SYMBOL_GPL(phylink_disconnect_phy);
 732
 733 void phylink_mac_change(struct phylink *pl, bool up)
 734 {
 735         if (!up)
 736                 pl->mac_link_dropped = true;
 737         phylink_run_resolve(pl);
 738         netdev_dbg(pl->netdev, "mac link %s\n", up ? "up" : "down");
 739 }
 740 EXPORT_SYMBOL_GPL(phylink_mac_change);
 741
 742 void phylink_start(struct phylink *pl)
 743 {
 744         WARN_ON(!lockdep_rtnl_is_held());
 745
 746         netdev_info(pl->netdev, "configuring for %s/%s link mode\n",
 747                     phylink_an_mode_str(pl->link_an_mode),
 748                     phy_modes(pl->link_config.interface));
 749
 750         /* Apply the link configuration to the MAC when starting. This allows
 751          * a fixed-link to start with the correct parameters, and also
 752          * ensures that we set the appropriate advertisment for Serdes links.
 753          */
 754         phylink_resolve_flow(pl, &pl->link_config);
 755         phylink_mac_config(pl, &pl->link_config);
 756
 757         clear_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
 758         phylink_run_resolve(pl);
 759
 760         if (pl->sfp_bus)
 761                 sfp_upstream_start(pl->sfp_bus);
 762         if (pl->phydev)
 763                 phy_start(pl->phydev);
 764 }
 765 EXPORT_SYMBOL_GPL(phylink_start);
 766
 767 void phylink_stop(struct phylink *pl)
 768 {
 769         WARN_ON(!lockdep_rtnl_is_held());
 770
 771         if (pl->phydev)
 772                 phy_stop(pl->phydev);
 773         if (pl->sfp_bus)
 774                 sfp_upstream_stop(pl->sfp_bus);
 775
 776         set_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
 777         queue_work(system_power_efficient_wq, &pl->resolve);
 778         flush_work(&pl->resolve);
 779 }
 780 EXPORT_SYMBOL_GPL(phylink_stop);
 781
 782 void phylink_ethtool_get_wol(struct phylink *pl, struct ethtool_wolinfo *wol)
 783 {
 784         WARN_ON(!lockdep_rtnl_is_held());
 785
 786         wol->supported = 0;
 787         wol->wolopts = 0;
 788
 789         if (pl->phydev)
 790                 phy_ethtool_get_wol(pl->phydev, wol);
 791 }
 792 EXPORT_SYMBOL_GPL(phylink_ethtool_get_wol);
 793
 794 int phylink_ethtool_set_wol(struct phylink *pl, struct ethtool_wolinfo *wol)
 795 {
 796         int ret = -EOPNOTSUPP;
 797
 798         WARN_ON(!lockdep_rtnl_is_held());
 799
 800         if (pl->phydev)
 801                 ret = phy_ethtool_set_wol(pl->phydev, wol);
 802
 803         return ret;
 804 }
 805 EXPORT_SYMBOL_GPL(phylink_ethtool_set_wol);
 806
 807 static void phylink_merge_link_mode(unsigned long *dst, const unsigned long *b)
 808 {
 809         __ETHTOOL_DECLARE_LINK_MODE_MASK(mask);
 810
 811         linkmode_zero(mask);
 812         phylink_set_port_modes(mask);
 813
 814         linkmode_and(dst, dst, mask);
 815         linkmode_or(dst, dst, b);
 816 }
 817
 818 static void phylink_get_ksettings(const struct phylink_link_state *state,
 819                                   struct ethtool_link_ksettings *kset)
 820 {
 821         phylink_merge_link_mode(kset->link_modes.advertising, state->advertising);
 822         linkmode_copy(kset->link_modes.lp_advertising, state->lp_advertising);
 823         kset->base.speed = state->speed;
 824         kset->base.duplex = state->duplex;
 825         kset->base.autoneg = state->an_enabled ? AUTONEG_ENABLE :
 826                                 AUTONEG_DISABLE;
 827 }
 828
 829 int phylink_ethtool_ksettings_get(struct phylink *pl,
 830                                   struct ethtool_link_ksettings *kset)
 831 {
 832         struct phylink_link_state link_state;
 833
 834         WARN_ON(!lockdep_rtnl_is_held());
 835
 836         if (pl->phydev) {
 837                 phy_ethtool_ksettings_get(pl->phydev, kset);
 838         } else {
 839                 kset->base.port = pl->link_port;
 840         }
 841
 842         linkmode_copy(kset->link_modes.supported, pl->supported);
 843
 844         switch (pl->link_an_mode) {
 845         case MLO_AN_FIXED:
 846                 /* We are using fixed settings. Report these as the
 847                  * current link settings - and note that these also
 848                  * represent the supported speeds/duplex/pause modes.
 849                  */
 850                 phylink_get_fixed_state(pl, &link_state);
 851                 phylink_get_ksettings(&link_state, kset);
 852                 break;
 853
 854         case MLO_AN_SGMII:
 855                 /* If there is a phy attached, then use the reported
 856                  * settings from the phy with no modification.
 857                  */
 858                 if (pl->phydev)
 859                         break;
 860
 861         case MLO_AN_8023Z:
 862                 phylink_get_mac_state(pl, &link_state);
 863
 864                 /* The MAC is reporting the link results from its own PCS
 865                  * layer via in-band status. Report these as the current
 866                  * link settings.
 867                  */
 868                 phylink_get_ksettings(&link_state, kset);
 869                 break;
 870         }
 871
 872         return 0;
 873 }
 874 EXPORT_SYMBOL_GPL(phylink_ethtool_ksettings_get);
 875
 876 int phylink_ethtool_ksettings_set(struct phylink *pl,
 877                                   const struct ethtool_link_ksettings *kset)
 878 {
 879         struct ethtool_link_ksettings our_kset;
 880         struct phylink_link_state config;
 881         int ret;
 882
 883         WARN_ON(!lockdep_rtnl_is_held());
 884
 885         if (kset->base.autoneg != AUTONEG_DISABLE &&
 886             kset->base.autoneg != AUTONEG_ENABLE)
 887                 return -EINVAL;
 888
 889         config = pl->link_config;
 890
 891         /* Mask out unsupported advertisments */
 892         linkmode_and(config.advertising, kset->link_modes.advertising,
 893                      pl->supported);
 894
 895         /* FIXME: should we reject autoneg if phy/mac does not support it? */
 896         if (kset->base.autoneg == AUTONEG_DISABLE) {
 897                 const struct phy_setting *s;
 898
 899                 /* Autonegotiation disabled, select a suitable speed and
 900                  * duplex.
 901                  */
 902                 s = phy_lookup_setting(kset->base.speed, kset->base.duplex,
 903                                        pl->supported,
 904                                        __ETHTOOL_LINK_MODE_MASK_NBITS, false);
 905                 if (!s)
 906                         return -EINVAL;
 907
 908                 /* If we have a fixed link (as specified by firmware), refuse
 909                  * to change link parameters.
 910                  */
 911                 if (pl->link_an_mode == MLO_AN_FIXED &&
 912                     (s->speed != pl->link_config.speed ||
 913                      s->duplex != pl->link_config.duplex))
 914                         return -EINVAL;
 915
 916                 config.speed = s->speed;
 917                 config.duplex = s->duplex;
 918                 config.an_enabled = false;
 919
 920                 __clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, config.advertising);
 921         } else {
 922                 /* If we have a fixed link, refuse to enable autonegotiation */
 923                 if (pl->link_an_mode == MLO_AN_FIXED)
 924                         return -EINVAL;
 925
 926                 config.speed = SPEED_UNKNOWN;
 927                 config.duplex = DUPLEX_UNKNOWN;
 928                 config.an_enabled = true;
 929
 930                 __set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, config.advertising);
 931         }
 932
 933         if (phylink_validate(pl, pl->supported, &config))
 934                 return -EINVAL;
 935
 936         /* If autonegotiation is enabled, we must have an advertisment */
 937         if (config.an_enabled && phylink_is_empty_linkmode(config.advertising))
 938                 return -EINVAL;
 939
 940         our_kset = *kset;
 941         linkmode_copy(our_kset.link_modes.advertising, config.advertising);
 942         our_kset.base.speed = config.speed;
 943         our_kset.base.duplex = config.duplex;
 944
 945         /* If we have a PHY, configure the phy */
 946         if (pl->phydev) {
 947                 ret = phy_ethtool_ksettings_set(pl->phydev, &our_kset);
 948                 if (ret)
 949                         return ret;
 950         }
 951
 952         mutex_lock(&pl->state_mutex);
 953         /* Configure the MAC to match the new settings */
 954         linkmode_copy(pl->link_config.advertising, our_kset.link_modes.advertising);
 955         pl->link_config.interface = config.interface;
 956         pl->link_config.speed = our_kset.base.speed;
 957         pl->link_config.duplex = our_kset.base.duplex;
 958         pl->link_config.an_enabled = our_kset.base.autoneg != AUTONEG_DISABLE;
 959
 960         if (!test_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state)) {
 961                 phylink_mac_config(pl, &pl->link_config);
 962                 phylink_mac_an_restart(pl);
 963         }
 964         mutex_unlock(&pl->state_mutex);
 965
 966         return 0;
 967 }
 968 EXPORT_SYMBOL_GPL(phylink_ethtool_ksettings_set);
 969
 970 int phylink_ethtool_nway_reset(struct phylink *pl)
 971 {
 972         int ret = 0;
 973
 974         WARN_ON(!lockdep_rtnl_is_held());
 975
 976         if (pl->phydev)
 977                 ret = phy_restart_aneg(pl->phydev);
 978         phylink_mac_an_restart(pl);
 979
 980         return ret;
 981 }
 982 EXPORT_SYMBOL_GPL(phylink_ethtool_nway_reset);
 983
 984 void phylink_ethtool_get_pauseparam(struct phylink *pl,
 985                                     struct ethtool_pauseparam *pause)
 986 {
 987         WARN_ON(!lockdep_rtnl_is_held());
 988
 989         pause->autoneg = !!(pl->link_config.pause & MLO_PAUSE_AN);
 990         pause->rx_pause = !!(pl->link_config.pause & MLO_PAUSE_RX);
 991         pause->tx_pause = !!(pl->link_config.pause & MLO_PAUSE_TX);
 992 }
 993 EXPORT_SYMBOL_GPL(phylink_ethtool_get_pauseparam);
 994
 995 int phylink_ethtool_set_pauseparam(struct phylink *pl,
 996                                    struct ethtool_pauseparam *pause)
 997 {
 998         struct phylink_link_state *config = &pl->link_config;
 999
1000         WARN_ON(!lockdep_rtnl_is_held());
1001
1002         if (!phylink_test(pl->supported, Pause) &&
1003             !phylink_test(pl->supported, Asym_Pause))
1004                 return -EOPNOTSUPP;
1005
1006         if (!phylink_test(pl->supported, Asym_Pause) &&
1007             !pause->autoneg && pause->rx_pause != pause->tx_pause)
1008                 return -EINVAL;
1009
1010         config->pause &= ~(MLO_PAUSE_AN | MLO_PAUSE_TXRX_MASK);
1011
1012         if (pause->autoneg)
1013                 config->pause |= MLO_PAUSE_AN;
1014         if (pause->rx_pause)
1015                 config->pause |= MLO_PAUSE_RX;
1016         if (pause->tx_pause)
1017                 config->pause |= MLO_PAUSE_TX;
1018
1019         if (!test_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state)) {
1020                 switch (pl->link_an_mode) {
1021                 case MLO_AN_PHY:
1022                         /* Silently mark the carrier down, and then trigger a resolve */
1023                         netif_carrier_off(pl->netdev);
1024                         phylink_run_resolve(pl);
1025                         break;
1026
1027                 case MLO_AN_FIXED:
1028                         /* Should we allow fixed links to change against the config? */
1029                         phylink_resolve_flow(pl, config);
1030                         phylink_mac_config(pl, config);
1031                         break;
1032
1033                 case MLO_AN_SGMII:
1034                 case MLO_AN_8023Z:
1035                         phylink_mac_config(pl, config);
1036                         phylink_mac_an_restart(pl);
1037                         break;
1038                 }
1039         }
1040
1041         return 0;
1042 }
1043 EXPORT_SYMBOL_GPL(phylink_ethtool_set_pauseparam);
1044
1045 int phylink_ethtool_get_module_info(struct phylink *pl,
1046                                     struct ethtool_modinfo *modinfo)
1047 {
1048         int ret = -EOPNOTSUPP;
1049
1050         WARN_ON(!lockdep_rtnl_is_held());
1051
1052         if (pl->sfp_bus)
1053                 ret = sfp_get_module_info(pl->sfp_bus, modinfo);
1054
1055         return ret;
1056 }
1057 EXPORT_SYMBOL_GPL(phylink_ethtool_get_module_info);
1058
1059 int phylink_ethtool_get_module_eeprom(struct phylink *pl,
1060                                       struct ethtool_eeprom *ee, u8 *buf)
1061 {
1062         int ret = -EOPNOTSUPP;
1063
1064         WARN_ON(!lockdep_rtnl_is_held());
1065
1066         if (pl->sfp_bus)
1067                 ret = sfp_get_module_eeprom(pl->sfp_bus, ee, buf);
1068
1069         return ret;
1070 }
1071 EXPORT_SYMBOL_GPL(phylink_ethtool_get_module_eeprom);
1072
1073 int phylink_init_eee(struct phylink *pl, bool clk_stop_enable)
1074 {
1075         int ret = -EPROTONOSUPPORT;
1076
1077         WARN_ON(!lockdep_rtnl_is_held());
1078
1079         if (pl->phydev)
1080                 ret = phy_init_eee(pl->phydev, clk_stop_enable);
1081
1082         return ret;
1083 }
1084 EXPORT_SYMBOL_GPL(phylink_init_eee);
1085
1086 int phylink_get_eee_err(struct phylink *pl)
1087 {
1088         int ret = 0;
1089
1090         WARN_ON(!lockdep_rtnl_is_held());
1091
1092         if (pl->phydev)
1093                 ret = phy_get_eee_err(pl->phydev);
1094
1095         return ret;
1096 }
1097 EXPORT_SYMBOL_GPL(phylink_get_eee_err);
1098
1099 int phylink_ethtool_get_eee(struct phylink *pl, struct ethtool_eee *eee)
1100 {
1101         int ret = -EOPNOTSUPP;
1102
1103         WARN_ON(!lockdep_rtnl_is_held());
1104
1105         if (pl->phydev)
1106                 ret = phy_ethtool_get_eee(pl->phydev, eee);
1107
1108         return ret;
1109 }
1110 EXPORT_SYMBOL_GPL(phylink_ethtool_get_eee);
1111
1112 int phylink_ethtool_set_eee(struct phylink *pl, struct ethtool_eee *eee)
1113 {
1114         int ret = -EOPNOTSUPP;
1115
1116         WARN_ON(!lockdep_rtnl_is_held());
1117
1118         if (pl->phydev)
1119                 ret = phy_ethtool_set_eee(pl->phydev, eee);
1120
1121         return ret;
1122 }
1123 EXPORT_SYMBOL_GPL(phylink_ethtool_set_eee);
1124
1125 /* This emulates MII registers for a fixed-mode phy operating as per the
1126  * passed in state. "aneg" defines if we report negotiation is possible.
1127  *
1128  * FIXME: should deal with negotiation state too.
1129  */
1130 static int phylink_mii_emul_read(struct net_device *ndev, unsigned int reg,
1131                                  struct phylink_link_state *state, bool aneg)
1132 {
1133         struct fixed_phy_status fs;
1134         int val;
1135
1136         fs.link = state->link;
1137         fs.speed = state->speed;
1138         fs.duplex = state->duplex;
1139         fs.pause = state->pause & MLO_PAUSE_SYM;
1140         fs.asym_pause = state->pause & MLO_PAUSE_ASYM;
1141
1142         val = swphy_read_reg(reg, &fs);
1143         if (reg == MII_BMSR) {
1144                 if (!state->an_complete)
1145                         val &= ~BMSR_ANEGCOMPLETE;
1146                 if (!aneg)
1147                         val &= ~BMSR_ANEGCAPABLE;
1148         }
1149         return val;
1150 }
1151
1152 static int phylink_phy_read(struct phylink *pl, unsigned int phy_id,
1153                             unsigned int reg)
1154 {
1155         struct phy_device *phydev = pl->phydev;
1156         int prtad, devad;
1157
1158         if (mdio_phy_id_is_c45(phy_id)) {
1159                 prtad = mdio_phy_id_prtad(phy_id);
1160                 devad = mdio_phy_id_devad(phy_id);
1161                 devad = MII_ADDR_C45 | devad << 16 | reg;
1162         } else if (phydev->is_c45) {
1163                 switch (reg) {
1164                 case MII_BMCR:
1165                 case MII_BMSR:
1166                 case MII_PHYSID1:
1167                 case MII_PHYSID2:
1168                         devad = __ffs(phydev->c45_ids.devices_in_package);
1169                         break;
1170                 case MII_ADVERTISE:
1171                 case MII_LPA:
1172                         if (!(phydev->c45_ids.devices_in_package & MDIO_DEVS_AN))
1173                                 return -EINVAL;
1174                         devad = MDIO_MMD_AN;
1175                         if (reg == MII_ADVERTISE)
1176                                 reg = MDIO_AN_ADVERTISE;
1177                         else
1178                                 reg = MDIO_AN_LPA;
1179                         break;
1180                 default:
1181                         return -EINVAL;
1182                 }
1183                 prtad = phy_id;
1184                 devad = MII_ADDR_C45 | devad << 16 | reg;
1185         } else {
1186                 prtad = phy_id;
1187                 devad = reg;
1188         }
1189         return mdiobus_read(pl->phydev->mdio.bus, prtad, devad);
1190 }
1191
1192 static int phylink_phy_write(struct phylink *pl, unsigned int phy_id,
1193                              unsigned int reg, unsigned int val)
1194 {
1195         struct phy_device *phydev = pl->phydev;
1196         int prtad, devad;
1197
1198         if (mdio_phy_id_is_c45(phy_id)) {
1199                 prtad = mdio_phy_id_prtad(phy_id);
1200                 devad = mdio_phy_id_devad(phy_id);
1201                 devad = MII_ADDR_C45 | devad << 16 | reg;
1202         } else if (phydev->is_c45) {
1203                 switch (reg) {
1204                 case MII_BMCR:
1205                 case MII_BMSR:
1206                 case MII_PHYSID1:
1207                 case MII_PHYSID2:
1208                         devad = __ffs(phydev->c45_ids.devices_in_package);
1209                         break;
1210                 case MII_ADVERTISE:
1211                 case MII_LPA:
1212                         if (!(phydev->c45_ids.devices_in_package & MDIO_DEVS_AN))
1213                                 return -EINVAL;
1214                         devad = MDIO_MMD_AN;
1215                         if (reg == MII_ADVERTISE)
1216                                 reg = MDIO_AN_ADVERTISE;
1217                         else
1218                                 reg = MDIO_AN_LPA;
1219                         break;
1220                 default:
1221                         return -EINVAL;
1222                 }
1223                 prtad = phy_id;
1224                 devad = MII_ADDR_C45 | devad << 16 | reg;
1225         } else {
1226                 prtad = phy_id;
1227                 devad = reg;
1228         }
1229
1230         return mdiobus_write(phydev->mdio.bus, prtad, devad, val);
1231 }
1232
1233 static int phylink_mii_read(struct phylink *pl, unsigned int phy_id,
1234                             unsigned int reg)
1235 {
1236         struct phylink_link_state state;
1237         int val = 0xffff;
1238
1239         switch (pl->link_an_mode) {
1240         case MLO_AN_FIXED:
1241                 if (phy_id == 0) {
1242                         phylink_get_fixed_state(pl, &state);
1243                         val = phylink_mii_emul_read(pl->netdev, reg, &state,
1244                                                     true);
1245                 }
1246                 break;
1247
1248         case MLO_AN_PHY:
1249                 return -EOPNOTSUPP;
1250
1251         case MLO_AN_SGMII:
1252                 /* No phy, fall through to 8023z method */
1253         case MLO_AN_8023Z:
1254                 if (phy_id == 0) {
1255                         val = phylink_get_mac_state(pl, &state);
1256                         if (val < 0)
1257                                 return val;
1258
1259                         val = phylink_mii_emul_read(pl->netdev, reg, &state,
1260                                                     true);
1261                 }
1262                 break;
1263         }
1264
1265         return val & 0xffff;
1266 }
1267
1268 static int phylink_mii_write(struct phylink *pl, unsigned int phy_id,
1269                              unsigned int reg, unsigned int val)
1270 {
1271         switch (pl->link_an_mode) {
1272         case MLO_AN_FIXED:
1273                 break;
1274
1275         case MLO_AN_PHY:
1276                 return -EOPNOTSUPP;
1277
1278         case MLO_AN_SGMII:
1279                 /* No phy, fall through to 8023z method */
1280         case MLO_AN_8023Z:
1281                 break;
1282         }
1283
1284         return 0;
1285 }
1286
1287 int phylink_mii_ioctl(struct phylink *pl, struct ifreq *ifr, int cmd)
1288 {
1289         struct mii_ioctl_data *mii = if_mii(ifr);
1290         int  ret;
1291
1292         WARN_ON(!lockdep_rtnl_is_held());
1293
1294         if (pl->phydev) {
1295                 /* PHYs only exist for MLO_AN_PHY and MLO_AN_SGMII */
1296                 switch (cmd) {
1297                 case SIOCGMIIPHY:
1298                         mii->phy_id = pl->phydev->mdio.addr;
1299
1300                 case SIOCGMIIREG:
1301                         ret = phylink_phy_read(pl, mii->phy_id, mii->reg_num);
1302                         if (ret >= 0) {
1303                                 mii->val_out = ret;
1304                                 ret = 0;
1305                         }
1306                         break;
1307
1308                 case SIOCSMIIREG:
1309                         ret = phylink_phy_write(pl, mii->phy_id, mii->reg_num,
1310                                                 mii->val_in);
1311                         break;
1312
1313                 default:
1314                         ret = phy_mii_ioctl(pl->phydev, ifr, cmd);
1315                         break;
1316                 }
1317         } else {
1318                 switch (cmd) {
1319                 case SIOCGMIIPHY:
1320                         mii->phy_id = 0;
1321
1322                 case SIOCGMIIREG:
1323                         ret = phylink_mii_read(pl, mii->phy_id, mii->reg_num);
1324                         if (ret >= 0) {
1325                                 mii->val_out = ret;
1326                                 ret = 0;
1327                         }
1328                         break;
1329
1330                 case SIOCSMIIREG:
1331                         ret = phylink_mii_write(pl, mii->phy_id, mii->reg_num,
1332                                                 mii->val_in);
1333                         break;
1334
1335                 default:
1336                         ret = -EOPNOTSUPP;
1337                         break;
1338                 }
1339         }
1340
1341         return ret;
1342 }
1343 EXPORT_SYMBOL_GPL(phylink_mii_ioctl);
1344
1345 static int phylink_sfp_module_insert(void *upstream,
1346                                      const struct sfp_eeprom_id *id)
1347 {
1348         struct phylink *pl = upstream;
1349         __ETHTOOL_DECLARE_LINK_MODE_MASK(support) = { 0, };
1350         struct phylink_link_state config;
1351         phy_interface_t iface;
1352         int mode, ret = 0;
1353         bool changed;
1354         u8 port;
1355
1356         sfp_parse_support(pl->sfp_bus, id, support);
1357         port = sfp_parse_port(pl->sfp_bus, id, support);
1358         iface = sfp_parse_interface(pl->sfp_bus, id);
1359
1360         WARN_ON(!lockdep_rtnl_is_held());
1361
1362         switch (iface) {
1363         case PHY_INTERFACE_MODE_SGMII:
1364                 mode = MLO_AN_SGMII;
1365                 break;
1366         case PHY_INTERFACE_MODE_1000BASEX:
1367                 mode = MLO_AN_8023Z;
1368                 break;
1369         default:
1370                 return -EINVAL;
1371         }
1372
1373         memset(&config, 0, sizeof(config));
1374         linkmode_copy(config.advertising, support);
1375         config.interface = iface;
1376         config.speed = SPEED_UNKNOWN;
1377         config.duplex = DUPLEX_UNKNOWN;
1378         config.pause = MLO_PAUSE_AN;
1379         config.an_enabled = pl->link_config.an_enabled;
1380
1381         /* Ignore errors if we're expecting a PHY to attach later */
1382         ret = phylink_validate(pl, support, &config);
1383         if (ret) {
1384                 netdev_err(pl->netdev, "validation of %s/%s with support %*pb failed: %d\n",
1385                            phylink_an_mode_str(mode), phy_modes(config.interface),
1386                            __ETHTOOL_LINK_MODE_MASK_NBITS, support, ret);
1387                 return ret;
1388         }
1389
1390         netdev_dbg(pl->netdev, "requesting link mode %s/%s with support %*pb\n",
1391                    phylink_an_mode_str(mode), phy_modes(config.interface),
1392                    __ETHTOOL_LINK_MODE_MASK_NBITS, support);
1393
1394         if (mode == MLO_AN_8023Z && pl->phydev)
1395                 return -EINVAL;
1396
1397         changed = !bitmap_equal(pl->supported, support,
1398                                 __ETHTOOL_LINK_MODE_MASK_NBITS);
1399         if (changed) {
1400                 linkmode_copy(pl->supported, support);
1401                 linkmode_copy(pl->link_config.advertising, config.advertising);
1402         }
1403
1404         if (pl->link_an_mode != mode ||
1405             pl->link_config.interface != config.interface) {
1406                 pl->link_config.interface = config.interface;
1407                 pl->link_an_mode = mode;
1408
1409                 changed = true;
1410
1411                 netdev_info(pl->netdev, "switched to %s/%s link mode\n",
1412                             phylink_an_mode_str(mode),
1413                             phy_modes(config.interface));
1414         }
1415
1416         pl->link_port = port;
1417
1418         if (changed && !test_bit(PHYLINK_DISABLE_STOPPED,
1419                                  &pl->phylink_disable_state))
1420                 phylink_mac_config(pl, &pl->link_config);
1421
1422         return ret;
1423 }
1424
1425 static void phylink_sfp_link_down(void *upstream)
1426 {
1427         struct phylink *pl = upstream;
1428
1429         WARN_ON(!lockdep_rtnl_is_held());
1430
1431         set_bit(PHYLINK_DISABLE_LINK, &pl->phylink_disable_state);
1432         flush_work(&pl->resolve);
1433
1434         netif_carrier_off(pl->netdev);
1435 }
1436
1437 static void phylink_sfp_link_up(void *upstream)
1438 {
1439         struct phylink *pl = upstream;
1440
1441         WARN_ON(!lockdep_rtnl_is_held());
1442
1443         clear_bit(PHYLINK_DISABLE_LINK, &pl->phylink_disable_state);
1444         phylink_run_resolve(pl);
1445 }
1446
1447 static int phylink_sfp_connect_phy(void *upstream, struct phy_device *phy)
1448 {
1449         return phylink_connect_phy(upstream, phy);
1450 }
1451
1452 static void phylink_sfp_disconnect_phy(void *upstream)
1453 {
1454         phylink_disconnect_phy(upstream);
1455 }
1456
1457 static const struct sfp_upstream_ops sfp_phylink_ops = {
1458         .module_insert = phylink_sfp_module_insert,
1459         .link_up = phylink_sfp_link_up,
1460         .link_down = phylink_sfp_link_down,
1461         .connect_phy = phylink_sfp_connect_phy,
1462         .disconnect_phy = phylink_sfp_disconnect_phy,
1463 };
1464
1465 MODULE_LICENSE("GPL");