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