drivers/net/phy/phylink.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * phylink models the MAC to optional PHY connection, supporting
   4  * technologies such as SFP cages where the PHY is hot-pluggable.
   5  *
   6  * Copyright (C) 2015 Russell King
   7  */
   8 #include <linux/ethtool.h>
   9 #include <linux/export.h>
  10 #include <linux/gpio/consumer.h>
  11 #include <linux/netdevice.h>
  12 #include <linux/of.h>
  13 #include <linux/of_mdio.h>
  14 #include <linux/phy.h>
  15 #include <linux/phy_fixed.h>
  16 #include <linux/phylink.h>
  17 #include <linux/rtnetlink.h>
  18 #include <linux/spinlock.h>
  19 #include <linux/timer.h>
  20 #include <linux/workqueue.h>
  21
  22 #include "sfp.h"
  23 #include "swphy.h"
  24
  25 #define SUPPORTED_INTERFACES \
  26         (SUPPORTED_TP | SUPPORTED_MII | SUPPORTED_FIBRE | \
  27          SUPPORTED_BNC | SUPPORTED_AUI | SUPPORTED_Backplane)
  28 #define ADVERTISED_INTERFACES \
  29         (ADVERTISED_TP | ADVERTISED_MII | ADVERTISED_FIBRE | \
  30          ADVERTISED_BNC | ADVERTISED_AUI | ADVERTISED_Backplane)
  31
  32 enum {
  33         PHYLINK_DISABLE_STOPPED,
  34         PHYLINK_DISABLE_LINK,
  35 };
  36
  37 /**
  38  * struct phylink - internal data type for phylink
  39  */
  40 struct phylink {
  41         /* private: */
  42         struct net_device *netdev;
  43         const struct phylink_mac_ops *ops;
  44         struct phylink_config *config;
  45         struct device *dev;
  46         unsigned int old_link_state:1;
  47
  48         unsigned long phylink_disable_state; /* bitmask of disables */
  49         struct phy_device *phydev;
  50         phy_interface_t link_interface; /* PHY_INTERFACE_xxx */
  51         u8 cfg_link_an_mode;            /* MLO_AN_xxx */
  52         u8 cur_link_an_mode;
  53         u8 link_port;                   /* The current non-phy ethtool port */
  54         __ETHTOOL_DECLARE_LINK_MODE_MASK(supported);
  55
  56         /* The link configuration settings */
  57         struct phylink_link_state link_config;
  58
  59         /* The current settings */
  60         phy_interface_t cur_interface;
  61
  62         struct gpio_desc *link_gpio;
  63         unsigned int link_irq;
  64         struct timer_list link_poll;
  65         void (*get_fixed_state)(struct net_device *dev,
  66                                 struct phylink_link_state *s);
  67
  68         struct mutex state_mutex;
  69         struct phylink_link_state phy_state;
  70         struct work_struct resolve;
  71
  72         bool mac_link_dropped;
  73
  74         struct sfp_bus *sfp_bus;
  75         bool sfp_may_have_phy;
  76         __ETHTOOL_DECLARE_LINK_MODE_MASK(sfp_support);
  77         u8 sfp_port;
  78 };
  79
  80 #define phylink_printk(level, pl, fmt, ...) \
  81         do { \
  82                 if ((pl)->config->type == PHYLINK_NETDEV) \
  83                         netdev_printk(level, (pl)->netdev, fmt, ##__VA_ARGS__); \
  84                 else if ((pl)->config->type == PHYLINK_DEV) \
  85                         dev_printk(level, (pl)->dev, fmt, ##__VA_ARGS__); \
  86         } while (0)
  87
  88 #define phylink_err(pl, fmt, ...) \
  89         phylink_printk(KERN_ERR, pl, fmt, ##__VA_ARGS__)
  90 #define phylink_warn(pl, fmt, ...) \
  91         phylink_printk(KERN_WARNING, pl, fmt, ##__VA_ARGS__)
  92 #define phylink_info(pl, fmt, ...) \
  93         phylink_printk(KERN_INFO, pl, fmt, ##__VA_ARGS__)
  94 #if defined(CONFIG_DYNAMIC_DEBUG)
  95 #define phylink_dbg(pl, fmt, ...) \
  96 do {                                                                    \
  97         if ((pl)->config->type == PHYLINK_NETDEV)                       \
  98                 netdev_dbg((pl)->netdev, fmt, ##__VA_ARGS__);           \
  99         else if ((pl)->config->type == PHYLINK_DEV)                     \
 100                 dev_dbg((pl)->dev, fmt, ##__VA_ARGS__);                 \
 101 } while (0)
 102 #elif defined(DEBUG)
 103 #define phylink_dbg(pl, fmt, ...)                                       \
 104         phylink_printk(KERN_DEBUG, pl, fmt, ##__VA_ARGS__)
 105 #else
 106 #define phylink_dbg(pl, fmt, ...)                                       \
 107 ({                                                                      \
 108         if (0)                                                          \
 109                 phylink_printk(KERN_DEBUG, pl, fmt, ##__VA_ARGS__);     \
 110 })
 111 #endif
 112
 113 /**
 114  * phylink_set_port_modes() - set the port type modes in the ethtool mask
 115  * @mask: ethtool link mode mask
 116  *
 117  * Sets all the port type modes in the ethtool mask.  MAC drivers should
 118  * use this in their 'validate' callback.
 119  */
 120 void phylink_set_port_modes(unsigned long *mask)
 121 {
 122         phylink_set(mask, TP);
 123         phylink_set(mask, AUI);
 124         phylink_set(mask, MII);
 125         phylink_set(mask, FIBRE);
 126         phylink_set(mask, BNC);
 127         phylink_set(mask, Backplane);
 128 }
 129 EXPORT_SYMBOL_GPL(phylink_set_port_modes);
 130
 131 static int phylink_is_empty_linkmode(const unsigned long *linkmode)
 132 {
 133         __ETHTOOL_DECLARE_LINK_MODE_MASK(tmp) = { 0, };
 134
 135         phylink_set_port_modes(tmp);
 136         phylink_set(tmp, Autoneg);
 137         phylink_set(tmp, Pause);
 138         phylink_set(tmp, Asym_Pause);
 139
 140         return linkmode_subset(linkmode, tmp);
 141 }
 142
 143 static const char *phylink_an_mode_str(unsigned int mode)
 144 {
 145         static const char *modestr[] = {
 146                 [MLO_AN_PHY] = "phy",
 147                 [MLO_AN_FIXED] = "fixed",
 148                 [MLO_AN_INBAND] = "inband",
 149         };
 150
 151         return mode < ARRAY_SIZE(modestr) ? modestr[mode] : "unknown";
 152 }
 153
 154 static int phylink_validate(struct phylink *pl, unsigned long *supported,
 155                             struct phylink_link_state *state)
 156 {
 157         pl->ops->validate(pl->config, supported, state);
 158
 159         return phylink_is_empty_linkmode(supported) ? -EINVAL : 0;
 160 }
 161
 162 static int phylink_parse_fixedlink(struct phylink *pl,
 163                                    struct fwnode_handle *fwnode)
 164 {
 165         struct fwnode_handle *fixed_node;
 166         const struct phy_setting *s;
 167         struct gpio_desc *desc;
 168         u32 speed;
 169         int ret;
 170
 171         fixed_node = fwnode_get_named_child_node(fwnode, "fixed-link");
 172         if (fixed_node) {
 173                 ret = fwnode_property_read_u32(fixed_node, "speed", &speed);
 174
 175                 pl->link_config.speed = speed;
 176                 pl->link_config.duplex = DUPLEX_HALF;
 177
 178                 if (fwnode_property_read_bool(fixed_node, "full-duplex"))
 179                         pl->link_config.duplex = DUPLEX_FULL;
 180
 181                 /* We treat the "pause" and "asym-pause" terminology as
 182                  * defining the link partner's ability. */
 183                 if (fwnode_property_read_bool(fixed_node, "pause"))
 184                         pl->link_config.pause |= MLO_PAUSE_SYM;
 185                 if (fwnode_property_read_bool(fixed_node, "asym-pause"))
 186                         pl->link_config.pause |= MLO_PAUSE_ASYM;
 187
 188                 if (ret == 0) {
 189                         desc = fwnode_get_named_gpiod(fixed_node, "link-gpios",
 190                                                       0, GPIOD_IN, "?");
 191
 192                         if (!IS_ERR(desc))
 193                                 pl->link_gpio = desc;
 194                         else if (desc == ERR_PTR(-EPROBE_DEFER))
 195                                 ret = -EPROBE_DEFER;
 196                 }
 197                 fwnode_handle_put(fixed_node);
 198
 199                 if (ret)
 200                         return ret;
 201         } else {
 202                 u32 prop[5];
 203
 204                 ret = fwnode_property_read_u32_array(fwnode, "fixed-link",
 205                                                      NULL, 0);
 206                 if (ret != ARRAY_SIZE(prop)) {
 207                         phylink_err(pl, "broken fixed-link?\n");
 208                         return -EINVAL;
 209                 }
 210
 211                 ret = fwnode_property_read_u32_array(fwnode, "fixed-link",
 212                                                      prop, ARRAY_SIZE(prop));
 213                 if (!ret) {
 214                         pl->link_config.duplex = prop[1] ?
 215                                                 DUPLEX_FULL : DUPLEX_HALF;
 216                         pl->link_config.speed = prop[2];
 217                         if (prop[3])
 218                                 pl->link_config.pause |= MLO_PAUSE_SYM;
 219                         if (prop[4])
 220                                 pl->link_config.pause |= MLO_PAUSE_ASYM;
 221                 }
 222         }
 223
 224         if (pl->link_config.speed > SPEED_1000 &&
 225             pl->link_config.duplex != DUPLEX_FULL)
 226                 phylink_warn(pl, "fixed link specifies half duplex for %dMbps link?\n",
 227                              pl->link_config.speed);
 228
 229         bitmap_fill(pl->supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
 230         linkmode_copy(pl->link_config.advertising, pl->supported);
 231         phylink_validate(pl, pl->supported, &pl->link_config);
 232
 233         s = phy_lookup_setting(pl->link_config.speed, pl->link_config.duplex,
 234                                pl->supported, true);
 235         linkmode_zero(pl->supported);
 236         phylink_set(pl->supported, MII);
 237         phylink_set(pl->supported, Pause);
 238         phylink_set(pl->supported, Asym_Pause);
 239         if (s) {
 240                 __set_bit(s->bit, pl->supported);
 241         } else {
 242                 phylink_warn(pl, "fixed link %s duplex %dMbps not recognised\n",
 243                              pl->link_config.duplex == DUPLEX_FULL ? "full" : "half",
 244                              pl->link_config.speed);
 245         }
 246
 247         linkmode_and(pl->link_config.advertising, pl->link_config.advertising,
 248                      pl->supported);
 249
 250         pl->link_config.link = 1;
 251         pl->link_config.an_complete = 1;
 252
 253         return 0;
 254 }
 255
 256 static int phylink_parse_mode(struct phylink *pl, struct fwnode_handle *fwnode)
 257 {
 258         struct fwnode_handle *dn;
 259         const char *managed;
 260
 261         dn = fwnode_get_named_child_node(fwnode, "fixed-link");
 262         if (dn || fwnode_property_present(fwnode, "fixed-link"))
 263                 pl->cfg_link_an_mode = MLO_AN_FIXED;
 264         fwnode_handle_put(dn);
 265
 266         if (fwnode_property_read_string(fwnode, "managed", &managed) == 0 &&
 267             strcmp(managed, "in-band-status") == 0) {
 268                 if (pl->cfg_link_an_mode == MLO_AN_FIXED) {
 269                         phylink_err(pl,
 270                                     "can't use both fixed-link and in-band-status\n");
 271                         return -EINVAL;
 272                 }
 273
 274                 linkmode_zero(pl->supported);
 275                 phylink_set(pl->supported, MII);
 276                 phylink_set(pl->supported, Autoneg);
 277                 phylink_set(pl->supported, Asym_Pause);
 278                 phylink_set(pl->supported, Pause);
 279                 pl->link_config.an_enabled = true;
 280                 pl->cfg_link_an_mode = MLO_AN_INBAND;
 281
 282                 switch (pl->link_config.interface) {
 283                 case PHY_INTERFACE_MODE_SGMII:
 284                         phylink_set(pl->supported, 10baseT_Half);
 285                         phylink_set(pl->supported, 10baseT_Full);
 286                         phylink_set(pl->supported, 100baseT_Half);
 287                         phylink_set(pl->supported, 100baseT_Full);
 288                         phylink_set(pl->supported, 1000baseT_Half);
 289                         phylink_set(pl->supported, 1000baseT_Full);
 290                         break;
 291
 292                 case PHY_INTERFACE_MODE_1000BASEX:
 293                         phylink_set(pl->supported, 1000baseX_Full);
 294                         break;
 295
 296                 case PHY_INTERFACE_MODE_2500BASEX:
 297                         phylink_set(pl->supported, 2500baseX_Full);
 298                         break;
 299
 300                 case PHY_INTERFACE_MODE_10GKR:
 301                         phylink_set(pl->supported, 10baseT_Half);
 302                         phylink_set(pl->supported, 10baseT_Full);
 303                         phylink_set(pl->supported, 100baseT_Half);
 304                         phylink_set(pl->supported, 100baseT_Full);
 305                         phylink_set(pl->supported, 1000baseT_Half);
 306                         phylink_set(pl->supported, 1000baseT_Full);
 307                         phylink_set(pl->supported, 1000baseX_Full);
 308                         phylink_set(pl->supported, 10000baseKR_Full);
 309                         phylink_set(pl->supported, 10000baseCR_Full);
 310                         phylink_set(pl->supported, 10000baseSR_Full);
 311                         phylink_set(pl->supported, 10000baseLR_Full);
 312                         phylink_set(pl->supported, 10000baseLRM_Full);
 313                         phylink_set(pl->supported, 10000baseER_Full);
 314                         break;
 315
 316                 default:
 317                         phylink_err(pl,
 318                                     "incorrect link mode %s for in-band status\n",
 319                                     phy_modes(pl->link_config.interface));
 320                         return -EINVAL;
 321                 }
 322
 323                 linkmode_copy(pl->link_config.advertising, pl->supported);
 324
 325                 if (phylink_validate(pl, pl->supported, &pl->link_config)) {
 326                         phylink_err(pl,
 327                                     "failed to validate link configuration for in-band status\n");
 328                         return -EINVAL;
 329                 }
 330         }
 331
 332         return 0;
 333 }
 334
 335 static void phylink_mac_config(struct phylink *pl,
 336                                const struct phylink_link_state *state)
 337 {
 338         phylink_dbg(pl,
 339                     "%s: mode=%s/%s/%s/%s adv=%*pb pause=%02x link=%u an=%u\n",
 340                     __func__, phylink_an_mode_str(pl->cur_link_an_mode),
 341                     phy_modes(state->interface),
 342                     phy_speed_to_str(state->speed),
 343                     phy_duplex_to_str(state->duplex),
 344                     __ETHTOOL_LINK_MODE_MASK_NBITS, state->advertising,
 345                     state->pause, state->link, state->an_enabled);
 346
 347         pl->ops->mac_config(pl->config, pl->cur_link_an_mode, state);
 348 }
 349
 350 static void phylink_mac_config_up(struct phylink *pl,
 351                                   const struct phylink_link_state *state)
 352 {
 353         if (state->link)
 354                 phylink_mac_config(pl, state);
 355 }
 356
 357 static void phylink_mac_an_restart(struct phylink *pl)
 358 {
 359         if (pl->link_config.an_enabled &&
 360             phy_interface_mode_is_8023z(pl->link_config.interface))
 361                 pl->ops->mac_an_restart(pl->config);
 362 }
 363
 364 static void phylink_mac_pcs_get_state(struct phylink *pl,
 365                                       struct phylink_link_state *state)
 366 {
 367         linkmode_copy(state->advertising, pl->link_config.advertising);
 368         linkmode_zero(state->lp_advertising);
 369         state->interface = pl->link_config.interface;
 370         state->an_enabled = pl->link_config.an_enabled;
 371         state->speed = SPEED_UNKNOWN;
 372         state->duplex = DUPLEX_UNKNOWN;
 373         state->pause = MLO_PAUSE_NONE;
 374         state->an_complete = 0;
 375         state->link = 1;
 376
 377         pl->ops->mac_pcs_get_state(pl->config, state);
 378 }
 379
 380 /* The fixed state is... fixed except for the link state,
 381  * which may be determined by a GPIO or a callback.
 382  */
 383 static void phylink_get_fixed_state(struct phylink *pl, struct phylink_link_state *state)
 384 {
 385         *state = pl->link_config;
 386         if (pl->get_fixed_state)
 387                 pl->get_fixed_state(pl->netdev, state);
 388         else if (pl->link_gpio)
 389                 state->link = !!gpiod_get_value_cansleep(pl->link_gpio);
 390 }
 391
 392 /* Flow control is resolved according to our and the link partners
 393  * advertisements using the following drawn from the 802.3 specs:
 394  *  Local device  Link partner
 395  *  Pause AsymDir Pause AsymDir Result
 396  *    1     X       1     X     TX+RX
 397  *    0     1       1     1     TX
 398  *    1     1       0     1     RX
 399  */
 400 static void phylink_resolve_flow(struct phylink *pl,
 401                                  struct phylink_link_state *state)
 402 {
 403         int new_pause = 0;
 404
 405         if (pl->link_config.pause & MLO_PAUSE_AN) {
 406                 int pause = 0;
 407
 408                 if (phylink_test(pl->link_config.advertising, Pause))
 409                         pause |= MLO_PAUSE_SYM;
 410                 if (phylink_test(pl->link_config.advertising, Asym_Pause))
 411                         pause |= MLO_PAUSE_ASYM;
 412
 413                 pause &= state->pause;
 414
 415                 if (pause & MLO_PAUSE_SYM)
 416                         new_pause = MLO_PAUSE_TX | MLO_PAUSE_RX;
 417                 else if (pause & MLO_PAUSE_ASYM)
 418                         new_pause = state->pause & MLO_PAUSE_SYM ?
 419                                  MLO_PAUSE_TX : MLO_PAUSE_RX;
 420         } else {
 421                 new_pause = pl->link_config.pause & MLO_PAUSE_TXRX_MASK;
 422         }
 423
 424         state->pause &= ~MLO_PAUSE_TXRX_MASK;
 425         state->pause |= new_pause;
 426 }
 427
 428 static const char *phylink_pause_to_str(int pause)
 429 {
 430         switch (pause & MLO_PAUSE_TXRX_MASK) {
 431         case MLO_PAUSE_TX | MLO_PAUSE_RX:
 432                 return "rx/tx";
 433         case MLO_PAUSE_TX:
 434                 return "tx";
 435         case MLO_PAUSE_RX:
 436                 return "rx";
 437         default:
 438                 return "off";
 439         }
 440 }
 441
 442 static void phylink_mac_link_up(struct phylink *pl,
 443                                 struct phylink_link_state link_state)
 444 {
 445         struct net_device *ndev = pl->netdev;
 446
 447         pl->cur_interface = link_state.interface;
 448         pl->ops->mac_link_up(pl->config, pl->cur_link_an_mode,
 449                              pl->cur_interface, pl->phydev);
 450
 451         if (ndev)
 452                 netif_carrier_on(ndev);
 453
 454         phylink_info(pl,
 455                      "Link is Up - %s/%s - flow control %s\n",
 456                      phy_speed_to_str(link_state.speed),
 457                      phy_duplex_to_str(link_state.duplex),
 458                      phylink_pause_to_str(link_state.pause));
 459 }
 460
 461 static void phylink_mac_link_down(struct phylink *pl)
 462 {
 463         struct net_device *ndev = pl->netdev;
 464
 465         if (ndev)
 466                 netif_carrier_off(ndev);
 467         pl->ops->mac_link_down(pl->config, pl->cur_link_an_mode,
 468                                pl->cur_interface);
 469         phylink_info(pl, "Link is Down\n");
 470 }
 471
 472 static void phylink_resolve(struct work_struct *w)
 473 {
 474         struct phylink *pl = container_of(w, struct phylink, resolve);
 475         struct phylink_link_state link_state;
 476         struct net_device *ndev = pl->netdev;
 477         int link_changed;
 478
 479         mutex_lock(&pl->state_mutex);
 480         if (pl->phylink_disable_state) {
 481                 pl->mac_link_dropped = false;
 482                 link_state.link = false;
 483         } else if (pl->mac_link_dropped) {
 484                 link_state.link = false;
 485         } else {
 486                 switch (pl->cur_link_an_mode) {
 487                 case MLO_AN_PHY:
 488                         link_state = pl->phy_state;
 489                         phylink_resolve_flow(pl, &link_state);
 490                         phylink_mac_config_up(pl, &link_state);
 491                         break;
 492
 493                 case MLO_AN_FIXED:
 494                         phylink_get_fixed_state(pl, &link_state);
 495                         phylink_mac_config_up(pl, &link_state);
 496                         break;
 497
 498                 case MLO_AN_INBAND:
 499                         phylink_mac_pcs_get_state(pl, &link_state);
 500
 501                         /* If we have a phy, the "up" state is the union of
 502                          * both the PHY and the MAC */
 503                         if (pl->phydev)
 504                                 link_state.link &= pl->phy_state.link;
 505
 506                         /* Only update if the PHY link is up */
 507                         if (pl->phydev && pl->phy_state.link) {
 508                                 link_state.interface = pl->phy_state.interface;
 509
 510                                 /* If we have a PHY, we need to update with
 511                                  * the pause mode bits. */
 512                                 link_state.pause |= pl->phy_state.pause;
 513                                 phylink_resolve_flow(pl, &link_state);
 514                                 phylink_mac_config(pl, &link_state);
 515                         }
 516                         break;
 517                 }
 518         }
 519
 520         if (pl->netdev)
 521                 link_changed = (link_state.link != netif_carrier_ok(ndev));
 522         else
 523                 link_changed = (link_state.link != pl->old_link_state);
 524
 525         if (link_changed) {
 526                 pl->old_link_state = link_state.link;
 527                 if (!link_state.link)
 528                         phylink_mac_link_down(pl);
 529                 else
 530                         phylink_mac_link_up(pl, link_state);
 531         }
 532         if (!link_state.link && pl->mac_link_dropped) {
 533                 pl->mac_link_dropped = false;
 534                 queue_work(system_power_efficient_wq, &pl->resolve);
 535         }
 536         mutex_unlock(&pl->state_mutex);
 537 }
 538
 539 static void phylink_run_resolve(struct phylink *pl)
 540 {
 541         if (!pl->phylink_disable_state)
 542                 queue_work(system_power_efficient_wq, &pl->resolve);
 543 }
 544
 545 static void phylink_run_resolve_and_disable(struct phylink *pl, int bit)
 546 {
 547         unsigned long state = pl->phylink_disable_state;
 548
 549         set_bit(bit, &pl->phylink_disable_state);
 550         if (state == 0) {
 551                 queue_work(system_power_efficient_wq, &pl->resolve);
 552                 flush_work(&pl->resolve);
 553         }
 554 }
 555
 556 static void phylink_fixed_poll(struct timer_list *t)
 557 {
 558         struct phylink *pl = container_of(t, struct phylink, link_poll);
 559
 560         mod_timer(t, jiffies + HZ);
 561
 562         phylink_run_resolve(pl);
 563 }
 564
 565 static const struct sfp_upstream_ops sfp_phylink_ops;
 566
 567 static int phylink_register_sfp(struct phylink *pl,
 568                                 struct fwnode_handle *fwnode)
 569 {
 570         struct sfp_bus *bus;
 571         int ret;
 572
 573         bus = sfp_bus_find_fwnode(fwnode);
 574         if (IS_ERR(bus)) {
 575                 ret = PTR_ERR(bus);
 576                 phylink_err(pl, "unable to attach SFP bus: %d\n", ret);
 577                 return ret;
 578         }
 579
 580         pl->sfp_bus = bus;
 581
 582         ret = sfp_bus_add_upstream(bus, pl, &sfp_phylink_ops);
 583         sfp_bus_put(bus);
 584
 585         return ret;
 586 }
 587
 588 /**
 589  * phylink_create() - create a phylink instance
 590  * @config: a pointer to the target &struct phylink_config
 591  * @fwnode: a pointer to a &struct fwnode_handle describing the network
 592  *      interface
 593  * @iface: the desired link mode defined by &typedef phy_interface_t
 594  * @ops: a pointer to a &struct phylink_mac_ops for the MAC.
 595  *
 596  * Create a new phylink instance, and parse the link parameters found in @np.
 597  * This will parse in-band modes, fixed-link or SFP configuration.
 598  *
 599  * Note: the rtnl lock must not be held when calling this function.
 600  *
 601  * Returns a pointer to a &struct phylink, or an error-pointer value. Users
 602  * must use IS_ERR() to check for errors from this function.
 603  */
 604 struct phylink *phylink_create(struct phylink_config *config,
 605                                struct fwnode_handle *fwnode,
 606                                phy_interface_t iface,
 607                                const struct phylink_mac_ops *ops)
 608 {
 609         struct phylink *pl;
 610         int ret;
 611
 612         pl = kzalloc(sizeof(*pl), GFP_KERNEL);
 613         if (!pl)
 614                 return ERR_PTR(-ENOMEM);
 615
 616         mutex_init(&pl->state_mutex);
 617         INIT_WORK(&pl->resolve, phylink_resolve);
 618
 619         pl->config = config;
 620         if (config->type == PHYLINK_NETDEV) {
 621                 pl->netdev = to_net_dev(config->dev);
 622         } else if (config->type == PHYLINK_DEV) {
 623                 pl->dev = config->dev;
 624         } else {
 625                 kfree(pl);
 626                 return ERR_PTR(-EINVAL);
 627         }
 628
 629         pl->phy_state.interface = iface;
 630         pl->link_interface = iface;
 631         if (iface == PHY_INTERFACE_MODE_MOCA)
 632                 pl->link_port = PORT_BNC;
 633         else
 634                 pl->link_port = PORT_MII;
 635         pl->link_config.interface = iface;
 636         pl->link_config.pause = MLO_PAUSE_AN;
 637         pl->link_config.speed = SPEED_UNKNOWN;
 638         pl->link_config.duplex = DUPLEX_UNKNOWN;
 639         pl->link_config.an_enabled = true;
 640         pl->ops = ops;
 641         __set_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
 642         timer_setup(&pl->link_poll, phylink_fixed_poll, 0);
 643
 644         bitmap_fill(pl->supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
 645         linkmode_copy(pl->link_config.advertising, pl->supported);
 646         phylink_validate(pl, pl->supported, &pl->link_config);
 647
 648         ret = phylink_parse_mode(pl, fwnode);
 649         if (ret < 0) {
 650                 kfree(pl);
 651                 return ERR_PTR(ret);
 652         }
 653
 654         if (pl->cfg_link_an_mode == MLO_AN_FIXED) {
 655                 ret = phylink_parse_fixedlink(pl, fwnode);
 656                 if (ret < 0) {
 657                         kfree(pl);
 658                         return ERR_PTR(ret);
 659                 }
 660         }
 661
 662         pl->cur_link_an_mode = pl->cfg_link_an_mode;
 663
 664         ret = phylink_register_sfp(pl, fwnode);
 665         if (ret < 0) {
 666                 kfree(pl);
 667                 return ERR_PTR(ret);
 668         }
 669
 670         return pl;
 671 }
 672 EXPORT_SYMBOL_GPL(phylink_create);
 673
 674 /**
 675  * phylink_destroy() - cleanup and destroy the phylink instance
 676  * @pl: a pointer to a &struct phylink returned from phylink_create()
 677  *
 678  * Destroy a phylink instance. Any PHY that has been attached must have been
 679  * cleaned up via phylink_disconnect_phy() prior to calling this function.
 680  *
 681  * Note: the rtnl lock must not be held when calling this function.
 682  */
 683 void phylink_destroy(struct phylink *pl)
 684 {
 685         sfp_bus_del_upstream(pl->sfp_bus);
 686         if (pl->link_gpio)
 687                 gpiod_put(pl->link_gpio);
 688
 689         cancel_work_sync(&pl->resolve);
 690         kfree(pl);
 691 }
 692 EXPORT_SYMBOL_GPL(phylink_destroy);
 693
 694 static void phylink_phy_change(struct phy_device *phydev, bool up,
 695                                bool do_carrier)
 696 {
 697         struct phylink *pl = phydev->phylink;
 698
 699         mutex_lock(&pl->state_mutex);
 700         pl->phy_state.speed = phydev->speed;
 701         pl->phy_state.duplex = phydev->duplex;
 702         pl->phy_state.pause = MLO_PAUSE_NONE;
 703         if (phydev->pause)
 704                 pl->phy_state.pause |= MLO_PAUSE_SYM;
 705         if (phydev->asym_pause)
 706                 pl->phy_state.pause |= MLO_PAUSE_ASYM;
 707         pl->phy_state.interface = phydev->interface;
 708         pl->phy_state.link = up;
 709         mutex_unlock(&pl->state_mutex);
 710
 711         phylink_run_resolve(pl);
 712
 713         phylink_dbg(pl, "phy link %s %s/%s/%s\n", up ? "up" : "down",
 714                     phy_modes(phydev->interface),
 715                     phy_speed_to_str(phydev->speed),
 716                     phy_duplex_to_str(phydev->duplex));
 717 }
 718
 719 static int phylink_bringup_phy(struct phylink *pl, struct phy_device *phy,
 720                                phy_interface_t interface)
 721 {
 722         struct phylink_link_state config;
 723         __ETHTOOL_DECLARE_LINK_MODE_MASK(supported);
 724         int ret;
 725
 726         /*
 727          * This is the new way of dealing with flow control for PHYs,
 728          * as described by Timur Tabi in commit 529ed1275263 ("net: phy:
 729          * phy drivers should not set SUPPORTED_[Asym_]Pause") except
 730          * using our validate call to the MAC, we rely upon the MAC
 731          * clearing the bits from both supported and advertising fields.
 732          */
 733         phy_support_asym_pause(phy);
 734
 735         memset(&config, 0, sizeof(config));
 736         linkmode_copy(supported, phy->supported);
 737         linkmode_copy(config.advertising, phy->advertising);
 738
 739         /* Clause 45 PHYs switch their Serdes lane between several different
 740          * modes, normally 10GBASE-R, SGMII. Some use 2500BASE-X for 2.5G
 741          * speeds. We really need to know which interface modes the PHY and
 742          * MAC supports to properly work out which linkmodes can be supported.
 743          */
 744         if (phy->is_c45 &&
 745             interface != PHY_INTERFACE_MODE_RXAUI &&
 746             interface != PHY_INTERFACE_MODE_XAUI &&
 747             interface != PHY_INTERFACE_MODE_USXGMII)
 748                 config.interface = PHY_INTERFACE_MODE_NA;
 749         else
 750                 config.interface = interface;
 751
 752         ret = phylink_validate(pl, supported, &config);
 753         if (ret)
 754                 return ret;
 755
 756         phy->phylink = pl;
 757         phy->phy_link_change = phylink_phy_change;
 758
 759         phylink_info(pl,
 760                      "PHY [%s] driver [%s]\n", dev_name(&phy->mdio.dev),
 761                      phy->drv->name);
 762
 763         mutex_lock(&phy->lock);
 764         mutex_lock(&pl->state_mutex);
 765         pl->phydev = phy;
 766         pl->phy_state.interface = interface;
 767         linkmode_copy(pl->supported, supported);
 768         linkmode_copy(pl->link_config.advertising, config.advertising);
 769
 770         /* Restrict the phy advertisement according to the MAC support. */
 771         linkmode_copy(phy->advertising, config.advertising);
 772         mutex_unlock(&pl->state_mutex);
 773         mutex_unlock(&phy->lock);
 774
 775         phylink_dbg(pl,
 776                     "phy: setting supported %*pb advertising %*pb\n",
 777                     __ETHTOOL_LINK_MODE_MASK_NBITS, pl->supported,
 778                     __ETHTOOL_LINK_MODE_MASK_NBITS, phy->advertising);
 779
 780         if (phy_interrupt_is_valid(phy))
 781                 phy_request_interrupt(phy);
 782
 783         return 0;
 784 }
 785
 786 static int phylink_attach_phy(struct phylink *pl, struct phy_device *phy,
 787                               phy_interface_t interface)
 788 {
 789         if (WARN_ON(pl->cfg_link_an_mode == MLO_AN_FIXED ||
 790                     (pl->cfg_link_an_mode == MLO_AN_INBAND &&
 791                      phy_interface_mode_is_8023z(interface))))
 792                 return -EINVAL;
 793
 794         if (pl->phydev)
 795                 return -EBUSY;
 796
 797         return phy_attach_direct(pl->netdev, phy, 0, interface);
 798 }
 799
 800 /**
 801  * phylink_connect_phy() - connect a PHY to the phylink instance
 802  * @pl: a pointer to a &struct phylink returned from phylink_create()
 803  * @phy: a pointer to a &struct phy_device.
 804  *
 805  * Connect @phy to the phylink instance specified by @pl by calling
 806  * phy_attach_direct(). Configure the @phy according to the MAC driver's
 807  * capabilities, start the PHYLIB state machine and enable any interrupts
 808  * that the PHY supports.
 809  *
 810  * This updates the phylink's ethtool supported and advertising link mode
 811  * masks.
 812  *
 813  * Returns 0 on success or a negative errno.
 814  */
 815 int phylink_connect_phy(struct phylink *pl, struct phy_device *phy)
 816 {
 817         int ret;
 818
 819         /* Use PHY device/driver interface */
 820         if (pl->link_interface == PHY_INTERFACE_MODE_NA) {
 821                 pl->link_interface = phy->interface;
 822                 pl->link_config.interface = pl->link_interface;
 823         }
 824
 825         ret = phylink_attach_phy(pl, phy, pl->link_interface);
 826         if (ret < 0)
 827                 return ret;
 828
 829         ret = phylink_bringup_phy(pl, phy, pl->link_config.interface);
 830         if (ret)
 831                 phy_detach(phy);
 832
 833         return ret;
 834 }
 835 EXPORT_SYMBOL_GPL(phylink_connect_phy);
 836
 837 /**
 838  * phylink_of_phy_connect() - connect the PHY specified in the DT mode.
 839  * @pl: a pointer to a &struct phylink returned from phylink_create()
 840  * @dn: a pointer to a &struct device_node.
 841  * @flags: PHY-specific flags to communicate to the PHY device driver
 842  *
 843  * Connect the phy specified in the device node @dn to the phylink instance
 844  * specified by @pl. Actions specified in phylink_connect_phy() will be
 845  * performed.
 846  *
 847  * Returns 0 on success or a negative errno.
 848  */
 849 int phylink_of_phy_connect(struct phylink *pl, struct device_node *dn,
 850                            u32 flags)
 851 {
 852         struct device_node *phy_node;
 853         struct phy_device *phy_dev;
 854         int ret;
 855
 856         /* Fixed links and 802.3z are handled without needing a PHY */
 857         if (pl->cfg_link_an_mode == MLO_AN_FIXED ||
 858             (pl->cfg_link_an_mode == MLO_AN_INBAND &&
 859              phy_interface_mode_is_8023z(pl->link_interface)))
 860                 return 0;
 861
 862         phy_node = of_parse_phandle(dn, "phy-handle", 0);
 863         if (!phy_node)
 864                 phy_node = of_parse_phandle(dn, "phy", 0);
 865         if (!phy_node)
 866                 phy_node = of_parse_phandle(dn, "phy-device", 0);
 867
 868         if (!phy_node) {
 869                 if (pl->cfg_link_an_mode == MLO_AN_PHY)
 870                         return -ENODEV;
 871                 return 0;
 872         }
 873
 874         phy_dev = of_phy_find_device(phy_node);
 875         /* We're done with the phy_node handle */
 876         of_node_put(phy_node);
 877         if (!phy_dev)
 878                 return -ENODEV;
 879
 880         ret = phy_attach_direct(pl->netdev, phy_dev, flags,
 881                                 pl->link_interface);
 882         if (ret)
 883                 return ret;
 884
 885         ret = phylink_bringup_phy(pl, phy_dev, pl->link_config.interface);
 886         if (ret)
 887                 phy_detach(phy_dev);
 888
 889         return ret;
 890 }
 891 EXPORT_SYMBOL_GPL(phylink_of_phy_connect);
 892
 893 /**
 894  * phylink_disconnect_phy() - disconnect any PHY attached to the phylink
 895  *   instance.
 896  * @pl: a pointer to a &struct phylink returned from phylink_create()
 897  *
 898  * Disconnect any current PHY from the phylink instance described by @pl.
 899  */
 900 void phylink_disconnect_phy(struct phylink *pl)
 901 {
 902         struct phy_device *phy;
 903
 904         ASSERT_RTNL();
 905
 906         phy = pl->phydev;
 907         if (phy) {
 908                 mutex_lock(&phy->lock);
 909                 mutex_lock(&pl->state_mutex);
 910                 pl->phydev = NULL;
 911                 mutex_unlock(&pl->state_mutex);
 912                 mutex_unlock(&phy->lock);
 913                 flush_work(&pl->resolve);
 914
 915                 phy_disconnect(phy);
 916         }
 917 }
 918 EXPORT_SYMBOL_GPL(phylink_disconnect_phy);
 919
 920 /**
 921  * phylink_fixed_state_cb() - allow setting a fixed link callback
 922  * @pl: a pointer to a &struct phylink returned from phylink_create()
 923  * @cb: callback to execute to determine the fixed link state.
 924  *
 925  * The MAC driver should call this driver when the state of its link
 926  * can be determined through e.g: an out of band MMIO register.
 927  */
 928 int phylink_fixed_state_cb(struct phylink *pl,
 929                            void (*cb)(struct net_device *dev,
 930                                       struct phylink_link_state *state))
 931 {
 932         /* It does not make sense to let the link be overriden unless we use
 933          * MLO_AN_FIXED
 934          */
 935         if (pl->cfg_link_an_mode != MLO_AN_FIXED)
 936                 return -EINVAL;
 937
 938         mutex_lock(&pl->state_mutex);
 939         pl->get_fixed_state = cb;
 940         mutex_unlock(&pl->state_mutex);
 941
 942         return 0;
 943 }
 944 EXPORT_SYMBOL_GPL(phylink_fixed_state_cb);
 945
 946 /**
 947  * phylink_mac_change() - notify phylink of a change in MAC state
 948  * @pl: a pointer to a &struct phylink returned from phylink_create()
 949  * @up: indicates whether the link is currently up.
 950  *
 951  * The MAC driver should call this driver when the state of its link
 952  * changes (eg, link failure, new negotiation results, etc.)
 953  */
 954 void phylink_mac_change(struct phylink *pl, bool up)
 955 {
 956         if (!up)
 957                 pl->mac_link_dropped = true;
 958         phylink_run_resolve(pl);
 959         phylink_dbg(pl, "mac link %s\n", up ? "up" : "down");
 960 }
 961 EXPORT_SYMBOL_GPL(phylink_mac_change);
 962
 963 static irqreturn_t phylink_link_handler(int irq, void *data)
 964 {
 965         struct phylink *pl = data;
 966
 967         phylink_run_resolve(pl);
 968
 969         return IRQ_HANDLED;
 970 }
 971
 972 /**
 973  * phylink_start() - start a phylink instance
 974  * @pl: a pointer to a &struct phylink returned from phylink_create()
 975  *
 976  * Start the phylink instance specified by @pl, configuring the MAC for the
 977  * desired link mode(s) and negotiation style. This should be called from the
 978  * network device driver's &struct net_device_ops ndo_open() method.
 979  */
 980 void phylink_start(struct phylink *pl)
 981 {
 982         ASSERT_RTNL();
 983
 984         phylink_info(pl, "configuring for %s/%s link mode\n",
 985                      phylink_an_mode_str(pl->cur_link_an_mode),
 986                      phy_modes(pl->link_config.interface));
 987
 988         /* Always set the carrier off */
 989         if (pl->netdev)
 990                 netif_carrier_off(pl->netdev);
 991
 992         /* Apply the link configuration to the MAC when starting. This allows
 993          * a fixed-link to start with the correct parameters, and also
 994          * ensures that we set the appropriate advertisement for Serdes links.
 995          */
 996         phylink_resolve_flow(pl, &pl->link_config);
 997         phylink_mac_config(pl, &pl->link_config);
 998
 999         /* Restart autonegotiation if using 802.3z to ensure that the link
1000          * parameters are properly negotiated.  This is necessary for DSA
1001          * switches using 802.3z negotiation to ensure they see our modes.
1002          */
1003         phylink_mac_an_restart(pl);
1004
1005         clear_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
1006         phylink_run_resolve(pl);
1007
1008         if (pl->cfg_link_an_mode == MLO_AN_FIXED && pl->link_gpio) {
1009                 int irq = gpiod_to_irq(pl->link_gpio);
1010
1011                 if (irq > 0) {
1012                         if (!request_irq(irq, phylink_link_handler,
1013                                          IRQF_TRIGGER_RISING |
1014                                          IRQF_TRIGGER_FALLING,
1015                                          "netdev link", pl))
1016                                 pl->link_irq = irq;
1017                         else
1018                                 irq = 0;
1019                 }
1020                 if (irq <= 0)
1021                         mod_timer(&pl->link_poll, jiffies + HZ);
1022         }
1023         if (pl->cfg_link_an_mode == MLO_AN_FIXED && pl->get_fixed_state)
1024                 mod_timer(&pl->link_poll, jiffies + HZ);
1025         if (pl->phydev)
1026                 phy_start(pl->phydev);
1027         if (pl->sfp_bus)
1028                 sfp_upstream_start(pl->sfp_bus);
1029 }
1030 EXPORT_SYMBOL_GPL(phylink_start);
1031
1032 /**
1033  * phylink_stop() - stop a phylink instance
1034  * @pl: a pointer to a &struct phylink returned from phylink_create()
1035  *
1036  * Stop the phylink instance specified by @pl. This should be called from the
1037  * network device driver's &struct net_device_ops ndo_stop() method.  The
1038  * network device's carrier state should not be changed prior to calling this
1039  * function.
1040  */
1041 void phylink_stop(struct phylink *pl)
1042 {
1043         ASSERT_RTNL();
1044
1045         if (pl->sfp_bus)
1046                 sfp_upstream_stop(pl->sfp_bus);
1047         if (pl->phydev)
1048                 phy_stop(pl->phydev);
1049         del_timer_sync(&pl->link_poll);
1050         if (pl->link_irq) {
1051                 free_irq(pl->link_irq, pl);
1052                 pl->link_irq = 0;
1053         }
1054
1055         phylink_run_resolve_and_disable(pl, PHYLINK_DISABLE_STOPPED);
1056 }
1057 EXPORT_SYMBOL_GPL(phylink_stop);
1058
1059 /**
1060  * phylink_ethtool_get_wol() - get the wake on lan parameters for the PHY
1061  * @pl: a pointer to a &struct phylink returned from phylink_create()
1062  * @wol: a pointer to &struct ethtool_wolinfo to hold the read parameters
1063  *
1064  * Read the wake on lan parameters from the PHY attached to the phylink
1065  * instance specified by @pl. If no PHY is currently attached, report no
1066  * support for wake on lan.
1067  */
1068 void phylink_ethtool_get_wol(struct phylink *pl, struct ethtool_wolinfo *wol)
1069 {
1070         ASSERT_RTNL();
1071
1072         wol->supported = 0;
1073         wol->wolopts = 0;
1074
1075         if (pl->phydev)
1076                 phy_ethtool_get_wol(pl->phydev, wol);
1077 }
1078 EXPORT_SYMBOL_GPL(phylink_ethtool_get_wol);
1079
1080 /**
1081  * phylink_ethtool_set_wol() - set wake on lan parameters
1082  * @pl: a pointer to a &struct phylink returned from phylink_create()
1083  * @wol: a pointer to &struct ethtool_wolinfo for the desired parameters
1084  *
1085  * Set the wake on lan parameters for the PHY attached to the phylink
1086  * instance specified by @pl. If no PHY is attached, returns %EOPNOTSUPP
1087  * error.
1088  *
1089  * Returns zero on success or negative errno code.
1090  */
1091 int phylink_ethtool_set_wol(struct phylink *pl, struct ethtool_wolinfo *wol)
1092 {
1093         int ret = -EOPNOTSUPP;
1094
1095         ASSERT_RTNL();
1096
1097         if (pl->phydev)
1098                 ret = phy_ethtool_set_wol(pl->phydev, wol);
1099
1100         return ret;
1101 }
1102 EXPORT_SYMBOL_GPL(phylink_ethtool_set_wol);
1103
1104 static void phylink_merge_link_mode(unsigned long *dst, const unsigned long *b)
1105 {
1106         __ETHTOOL_DECLARE_LINK_MODE_MASK(mask);
1107
1108         linkmode_zero(mask);
1109         phylink_set_port_modes(mask);
1110
1111         linkmode_and(dst, dst, mask);
1112         linkmode_or(dst, dst, b);
1113 }
1114
1115 static void phylink_get_ksettings(const struct phylink_link_state *state,
1116                                   struct ethtool_link_ksettings *kset)
1117 {
1118         phylink_merge_link_mode(kset->link_modes.advertising, state->advertising);
1119         linkmode_copy(kset->link_modes.lp_advertising, state->lp_advertising);
1120         kset->base.speed = state->speed;
1121         kset->base.duplex = state->duplex;
1122         kset->base.autoneg = state->an_enabled ? AUTONEG_ENABLE :
1123                                 AUTONEG_DISABLE;
1124 }
1125
1126 /**
1127  * phylink_ethtool_ksettings_get() - get the current link settings
1128  * @pl: a pointer to a &struct phylink returned from phylink_create()
1129  * @kset: a pointer to a &struct ethtool_link_ksettings to hold link settings
1130  *
1131  * Read the current link settings for the phylink instance specified by @pl.
1132  * This will be the link settings read from the MAC, PHY or fixed link
1133  * settings depending on the current negotiation mode.
1134  */
1135 int phylink_ethtool_ksettings_get(struct phylink *pl,
1136                                   struct ethtool_link_ksettings *kset)
1137 {
1138         struct phylink_link_state link_state;
1139
1140         ASSERT_RTNL();
1141
1142         if (pl->phydev) {
1143                 phy_ethtool_ksettings_get(pl->phydev, kset);
1144         } else {
1145                 kset->base.port = pl->link_port;
1146         }
1147
1148         linkmode_copy(kset->link_modes.supported, pl->supported);
1149
1150         switch (pl->cur_link_an_mode) {
1151         case MLO_AN_FIXED:
1152                 /* We are using fixed settings. Report these as the
1153                  * current link settings - and note that these also
1154                  * represent the supported speeds/duplex/pause modes.
1155                  */
1156                 phylink_get_fixed_state(pl, &link_state);
1157                 phylink_get_ksettings(&link_state, kset);
1158                 break;
1159
1160         case MLO_AN_INBAND:
1161                 /* If there is a phy attached, then use the reported
1162                  * settings from the phy with no modification.
1163                  */
1164                 if (pl->phydev)
1165                         break;
1166
1167                 phylink_mac_pcs_get_state(pl, &link_state);
1168
1169                 /* The MAC is reporting the link results from its own PCS
1170                  * layer via in-band status. Report these as the current
1171                  * link settings.
1172                  */
1173                 phylink_get_ksettings(&link_state, kset);
1174                 break;
1175         }
1176
1177         return 0;
1178 }
1179 EXPORT_SYMBOL_GPL(phylink_ethtool_ksettings_get);
1180
1181 /**
1182  * phylink_ethtool_ksettings_set() - set the link settings
1183  * @pl: a pointer to a &struct phylink returned from phylink_create()
1184  * @kset: a pointer to a &struct ethtool_link_ksettings for the desired modes
1185  */
1186 int phylink_ethtool_ksettings_set(struct phylink *pl,
1187                                   const struct ethtool_link_ksettings *kset)
1188 {
1189         __ETHTOOL_DECLARE_LINK_MODE_MASK(support);
1190         struct ethtool_link_ksettings our_kset;
1191         struct phylink_link_state config;
1192         int ret;
1193
1194         ASSERT_RTNL();
1195
1196         if (kset->base.autoneg != AUTONEG_DISABLE &&
1197             kset->base.autoneg != AUTONEG_ENABLE)
1198                 return -EINVAL;
1199
1200         linkmode_copy(support, pl->supported);
1201         config = pl->link_config;
1202
1203         /* Mask out unsupported advertisements */
1204         linkmode_and(config.advertising, kset->link_modes.advertising,
1205                      support);
1206
1207         /* FIXME: should we reject autoneg if phy/mac does not support it? */
1208         if (kset->base.autoneg == AUTONEG_DISABLE) {
1209                 const struct phy_setting *s;
1210
1211                 /* Autonegotiation disabled, select a suitable speed and
1212                  * duplex.
1213                  */
1214                 s = phy_lookup_setting(kset->base.speed, kset->base.duplex,
1215                                        support, false);
1216                 if (!s)
1217                         return -EINVAL;
1218
1219                 /* If we have a fixed link (as specified by firmware), refuse
1220                  * to change link parameters.
1221                  */
1222                 if (pl->cur_link_an_mode == MLO_AN_FIXED &&
1223                     (s->speed != pl->link_config.speed ||
1224                      s->duplex != pl->link_config.duplex))
1225                         return -EINVAL;
1226
1227                 config.speed = s->speed;
1228                 config.duplex = s->duplex;
1229                 config.an_enabled = false;
1230
1231                 __clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, config.advertising);
1232         } else {
1233                 /* If we have a fixed link, refuse to enable autonegotiation */
1234                 if (pl->cur_link_an_mode == MLO_AN_FIXED)
1235                         return -EINVAL;
1236
1237                 config.speed = SPEED_UNKNOWN;
1238                 config.duplex = DUPLEX_UNKNOWN;
1239                 config.an_enabled = true;
1240
1241                 __set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, config.advertising);
1242         }
1243
1244         if (pl->phydev) {
1245                 /* If we have a PHY, we process the kset change via phylib.
1246                  * phylib will call our link state function if the PHY
1247                  * parameters have changed, which will trigger a resolve
1248                  * and update the MAC configuration.
1249                  */
1250                 our_kset = *kset;
1251                 linkmode_copy(our_kset.link_modes.advertising,
1252                               config.advertising);
1253                 our_kset.base.speed = config.speed;
1254                 our_kset.base.duplex = config.duplex;
1255
1256                 ret = phy_ethtool_ksettings_set(pl->phydev, &our_kset);
1257                 if (ret)
1258                         return ret;
1259
1260                 mutex_lock(&pl->state_mutex);
1261                 /* Save the new configuration */
1262                 linkmode_copy(pl->link_config.advertising,
1263                               our_kset.link_modes.advertising);
1264                 pl->link_config.interface = config.interface;
1265                 pl->link_config.speed = our_kset.base.speed;
1266                 pl->link_config.duplex = our_kset.base.duplex;
1267                 pl->link_config.an_enabled = our_kset.base.autoneg !=
1268                                              AUTONEG_DISABLE;
1269                 mutex_unlock(&pl->state_mutex);
1270         } else {
1271                 /* For a fixed link, this isn't able to change any parameters,
1272                  * which just leaves inband mode.
1273                  */
1274                 if (phylink_validate(pl, support, &config))
1275                         return -EINVAL;
1276
1277                 /* If autonegotiation is enabled, we must have an advertisement */
1278                 if (config.an_enabled &&
1279                     phylink_is_empty_linkmode(config.advertising))
1280                         return -EINVAL;
1281
1282                 mutex_lock(&pl->state_mutex);
1283                 linkmode_copy(pl->link_config.advertising, config.advertising);
1284                 pl->link_config.interface = config.interface;
1285                 pl->link_config.speed = config.speed;
1286                 pl->link_config.duplex = config.duplex;
1287                 pl->link_config.an_enabled = kset->base.autoneg !=
1288                                              AUTONEG_DISABLE;
1289
1290                 if (pl->cur_link_an_mode == MLO_AN_INBAND &&
1291                     !test_bit(PHYLINK_DISABLE_STOPPED,
1292                               &pl->phylink_disable_state)) {
1293                         /* If in 802.3z mode, this updates the advertisement.
1294                          *
1295                          * If we are in SGMII mode without a PHY, there is no
1296                          * advertisement; the only thing we have is the pause
1297                          * modes which can only come from a PHY.
1298                          */
1299                         phylink_mac_config(pl, &pl->link_config);
1300                         phylink_mac_an_restart(pl);
1301                 }
1302                 mutex_unlock(&pl->state_mutex);
1303         }
1304
1305         return 0;
1306 }
1307 EXPORT_SYMBOL_GPL(phylink_ethtool_ksettings_set);
1308
1309 /**
1310  * phylink_ethtool_nway_reset() - restart negotiation
1311  * @pl: a pointer to a &struct phylink returned from phylink_create()
1312  *
1313  * Restart negotiation for the phylink instance specified by @pl. This will
1314  * cause any attached phy to restart negotiation with the link partner, and
1315  * if the MAC is in a BaseX mode, the MAC will also be requested to restart
1316  * negotiation.
1317  *
1318  * Returns zero on success, or negative error code.
1319  */
1320 int phylink_ethtool_nway_reset(struct phylink *pl)
1321 {
1322         int ret = 0;
1323
1324         ASSERT_RTNL();
1325
1326         if (pl->phydev)
1327                 ret = phy_restart_aneg(pl->phydev);
1328         phylink_mac_an_restart(pl);
1329
1330         return ret;
1331 }
1332 EXPORT_SYMBOL_GPL(phylink_ethtool_nway_reset);
1333
1334 /**
1335  * phylink_ethtool_get_pauseparam() - get the current pause parameters
1336  * @pl: a pointer to a &struct phylink returned from phylink_create()
1337  * @pause: a pointer to a &struct ethtool_pauseparam
1338  */
1339 void phylink_ethtool_get_pauseparam(struct phylink *pl,
1340                                     struct ethtool_pauseparam *pause)
1341 {
1342         ASSERT_RTNL();
1343
1344         pause->autoneg = !!(pl->link_config.pause & MLO_PAUSE_AN);
1345         pause->rx_pause = !!(pl->link_config.pause & MLO_PAUSE_RX);
1346         pause->tx_pause = !!(pl->link_config.pause & MLO_PAUSE_TX);
1347 }
1348 EXPORT_SYMBOL_GPL(phylink_ethtool_get_pauseparam);
1349
1350 /**
1351  * phylink_ethtool_set_pauseparam() - set the current pause parameters
1352  * @pl: a pointer to a &struct phylink returned from phylink_create()
1353  * @pause: a pointer to a &struct ethtool_pauseparam
1354  */
1355 int phylink_ethtool_set_pauseparam(struct phylink *pl,
1356                                    struct ethtool_pauseparam *pause)
1357 {
1358         struct phylink_link_state *config = &pl->link_config;
1359
1360         ASSERT_RTNL();
1361
1362         if (!phylink_test(pl->supported, Pause) &&
1363             !phylink_test(pl->supported, Asym_Pause))
1364                 return -EOPNOTSUPP;
1365
1366         if (!phylink_test(pl->supported, Asym_Pause) &&
1367             !pause->autoneg && pause->rx_pause != pause->tx_pause)
1368                 return -EINVAL;
1369
1370         config->pause &= ~(MLO_PAUSE_AN | MLO_PAUSE_TXRX_MASK);
1371
1372         if (pause->autoneg)
1373                 config->pause |= MLO_PAUSE_AN;
1374         if (pause->rx_pause)
1375                 config->pause |= MLO_PAUSE_RX;
1376         if (pause->tx_pause)
1377                 config->pause |= MLO_PAUSE_TX;
1378
1379         /* If we have a PHY, phylib will call our link state function if the
1380          * mode has changed, which will trigger a resolve and update the MAC
1381          * configuration.
1382          */
1383         if (pl->phydev) {
1384                 phy_set_asym_pause(pl->phydev, pause->rx_pause,
1385                                    pause->tx_pause);
1386         } else if (!test_bit(PHYLINK_DISABLE_STOPPED,
1387                              &pl->phylink_disable_state)) {
1388                 switch (pl->cur_link_an_mode) {
1389                 case MLO_AN_FIXED:
1390                         /* Should we allow fixed links to change against the config? */
1391                         phylink_resolve_flow(pl, config);
1392                         phylink_mac_config(pl, config);
1393                         break;
1394
1395                 case MLO_AN_INBAND:
1396                         phylink_mac_config(pl, config);
1397                         phylink_mac_an_restart(pl);
1398                         break;
1399                 }
1400         }
1401
1402         return 0;
1403 }
1404 EXPORT_SYMBOL_GPL(phylink_ethtool_set_pauseparam);
1405
1406 /**
1407  * phylink_ethtool_get_eee_err() - read the energy efficient ethernet error
1408  *   counter
1409  * @pl: a pointer to a &struct phylink returned from phylink_create().
1410  *
1411  * Read the Energy Efficient Ethernet error counter from the PHY associated
1412  * with the phylink instance specified by @pl.
1413  *
1414  * Returns positive error counter value, or negative error code.
1415  */
1416 int phylink_get_eee_err(struct phylink *pl)
1417 {
1418         int ret = 0;
1419
1420         ASSERT_RTNL();
1421
1422         if (pl->phydev)
1423                 ret = phy_get_eee_err(pl->phydev);
1424
1425         return ret;
1426 }
1427 EXPORT_SYMBOL_GPL(phylink_get_eee_err);
1428
1429 /**
1430  * phylink_init_eee() - init and check the EEE features
1431  * @pl: a pointer to a &struct phylink returned from phylink_create()
1432  * @clk_stop_enable: allow PHY to stop receive clock
1433  *
1434  * Must be called either with RTNL held or within mac_link_up()
1435  */
1436 int phylink_init_eee(struct phylink *pl, bool clk_stop_enable)
1437 {
1438         int ret = -EOPNOTSUPP;
1439
1440         if (pl->phydev)
1441                 ret = phy_init_eee(pl->phydev, clk_stop_enable);
1442
1443         return ret;
1444 }
1445 EXPORT_SYMBOL_GPL(phylink_init_eee);
1446
1447 /**
1448  * phylink_ethtool_get_eee() - read the energy efficient ethernet parameters
1449  * @pl: a pointer to a &struct phylink returned from phylink_create()
1450  * @eee: a pointer to a &struct ethtool_eee for the read parameters
1451  */
1452 int phylink_ethtool_get_eee(struct phylink *pl, struct ethtool_eee *eee)
1453 {
1454         int ret = -EOPNOTSUPP;
1455
1456         ASSERT_RTNL();
1457
1458         if (pl->phydev)
1459                 ret = phy_ethtool_get_eee(pl->phydev, eee);
1460
1461         return ret;
1462 }
1463 EXPORT_SYMBOL_GPL(phylink_ethtool_get_eee);
1464
1465 /**
1466  * phylink_ethtool_set_eee() - set the energy efficient ethernet parameters
1467  * @pl: a pointer to a &struct phylink returned from phylink_create()
1468  * @eee: a pointer to a &struct ethtool_eee for the desired parameters
1469  */
1470 int phylink_ethtool_set_eee(struct phylink *pl, struct ethtool_eee *eee)
1471 {
1472         int ret = -EOPNOTSUPP;
1473
1474         ASSERT_RTNL();
1475
1476         if (pl->phydev)
1477                 ret = phy_ethtool_set_eee(pl->phydev, eee);
1478
1479         return ret;
1480 }
1481 EXPORT_SYMBOL_GPL(phylink_ethtool_set_eee);
1482
1483 /* This emulates MII registers for a fixed-mode phy operating as per the
1484  * passed in state. "aneg" defines if we report negotiation is possible.
1485  *
1486  * FIXME: should deal with negotiation state too.
1487  */
1488 static int phylink_mii_emul_read(unsigned int reg,
1489                                  struct phylink_link_state *state)
1490 {
1491         struct fixed_phy_status fs;
1492         int val;
1493
1494         fs.link = state->link;
1495         fs.speed = state->speed;
1496         fs.duplex = state->duplex;
1497         fs.pause = state->pause & MLO_PAUSE_SYM;
1498         fs.asym_pause = state->pause & MLO_PAUSE_ASYM;
1499
1500         val = swphy_read_reg(reg, &fs);
1501         if (reg == MII_BMSR) {
1502                 if (!state->an_complete)
1503                         val &= ~BMSR_ANEGCOMPLETE;
1504         }
1505         return val;
1506 }
1507
1508 static int phylink_phy_read(struct phylink *pl, unsigned int phy_id,
1509                             unsigned int reg)
1510 {
1511         struct phy_device *phydev = pl->phydev;
1512         int prtad, devad;
1513
1514         if (mdio_phy_id_is_c45(phy_id)) {
1515                 prtad = mdio_phy_id_prtad(phy_id);
1516                 devad = mdio_phy_id_devad(phy_id);
1517                 devad = MII_ADDR_C45 | devad << 16 | reg;
1518         } else if (phydev->is_c45) {
1519                 switch (reg) {
1520                 case MII_BMCR:
1521                 case MII_BMSR:
1522                 case MII_PHYSID1:
1523                 case MII_PHYSID2:
1524                         devad = __ffs(phydev->c45_ids.devices_in_package);
1525                         break;
1526                 case MII_ADVERTISE:
1527                 case MII_LPA:
1528                         if (!(phydev->c45_ids.devices_in_package & MDIO_DEVS_AN))
1529                                 return -EINVAL;
1530                         devad = MDIO_MMD_AN;
1531                         if (reg == MII_ADVERTISE)
1532                                 reg = MDIO_AN_ADVERTISE;
1533                         else
1534                                 reg = MDIO_AN_LPA;
1535                         break;
1536                 default:
1537                         return -EINVAL;
1538                 }
1539                 prtad = phy_id;
1540                 devad = MII_ADDR_C45 | devad << 16 | reg;
1541         } else {
1542                 prtad = phy_id;
1543                 devad = reg;
1544         }
1545         return mdiobus_read(pl->phydev->mdio.bus, prtad, devad);
1546 }
1547
1548 static int phylink_phy_write(struct phylink *pl, unsigned int phy_id,
1549                              unsigned int reg, unsigned int val)
1550 {
1551         struct phy_device *phydev = pl->phydev;
1552         int prtad, devad;
1553
1554         if (mdio_phy_id_is_c45(phy_id)) {
1555                 prtad = mdio_phy_id_prtad(phy_id);
1556                 devad = mdio_phy_id_devad(phy_id);
1557                 devad = MII_ADDR_C45 | devad << 16 | reg;
1558         } else if (phydev->is_c45) {
1559                 switch (reg) {
1560                 case MII_BMCR:
1561                 case MII_BMSR:
1562                 case MII_PHYSID1:
1563                 case MII_PHYSID2:
1564                         devad = __ffs(phydev->c45_ids.devices_in_package);
1565                         break;
1566                 case MII_ADVERTISE:
1567                 case MII_LPA:
1568                         if (!(phydev->c45_ids.devices_in_package & MDIO_DEVS_AN))
1569                                 return -EINVAL;
1570                         devad = MDIO_MMD_AN;
1571                         if (reg == MII_ADVERTISE)
1572                                 reg = MDIO_AN_ADVERTISE;
1573                         else
1574                                 reg = MDIO_AN_LPA;
1575                         break;
1576                 default:
1577                         return -EINVAL;
1578                 }
1579                 prtad = phy_id;
1580                 devad = MII_ADDR_C45 | devad << 16 | reg;
1581         } else {
1582                 prtad = phy_id;
1583                 devad = reg;
1584         }
1585
1586         return mdiobus_write(phydev->mdio.bus, prtad, devad, val);
1587 }
1588
1589 static int phylink_mii_read(struct phylink *pl, unsigned int phy_id,
1590                             unsigned int reg)
1591 {
1592         struct phylink_link_state state;
1593         int val = 0xffff;
1594
1595         switch (pl->cur_link_an_mode) {
1596         case MLO_AN_FIXED:
1597                 if (phy_id == 0) {
1598                         phylink_get_fixed_state(pl, &state);
1599                         val = phylink_mii_emul_read(reg, &state);
1600                 }
1601                 break;
1602
1603         case MLO_AN_PHY:
1604                 return -EOPNOTSUPP;
1605
1606         case MLO_AN_INBAND:
1607                 if (phy_id == 0) {
1608                         phylink_mac_pcs_get_state(pl, &state);
1609                         val = phylink_mii_emul_read(reg, &state);
1610                 }
1611                 break;
1612         }
1613
1614         return val & 0xffff;
1615 }
1616
1617 static int phylink_mii_write(struct phylink *pl, unsigned int phy_id,
1618                              unsigned int reg, unsigned int val)
1619 {
1620         switch (pl->cur_link_an_mode) {
1621         case MLO_AN_FIXED:
1622                 break;
1623
1624         case MLO_AN_PHY:
1625                 return -EOPNOTSUPP;
1626
1627         case MLO_AN_INBAND:
1628                 break;
1629         }
1630
1631         return 0;
1632 }
1633
1634 /**
1635  * phylink_mii_ioctl() - generic mii ioctl interface
1636  * @pl: a pointer to a &struct phylink returned from phylink_create()
1637  * @ifr: a pointer to a &struct ifreq for socket ioctls
1638  * @cmd: ioctl cmd to execute
1639  *
1640  * Perform the specified MII ioctl on the PHY attached to the phylink instance
1641  * specified by @pl. If no PHY is attached, emulate the presence of the PHY.
1642  *
1643  * Returns: zero on success or negative error code.
1644  *
1645  * %SIOCGMIIPHY:
1646  *  read register from the current PHY.
1647  * %SIOCGMIIREG:
1648  *  read register from the specified PHY.
1649  * %SIOCSMIIREG:
1650  *  set a register on the specified PHY.
1651  */
1652 int phylink_mii_ioctl(struct phylink *pl, struct ifreq *ifr, int cmd)
1653 {
1654         struct mii_ioctl_data *mii = if_mii(ifr);
1655         int  ret;
1656
1657         ASSERT_RTNL();
1658
1659         if (pl->phydev) {
1660                 /* PHYs only exist for MLO_AN_PHY and SGMII */
1661                 switch (cmd) {
1662                 case SIOCGMIIPHY:
1663                         mii->phy_id = pl->phydev->mdio.addr;
1664                         /* fall through */
1665
1666                 case SIOCGMIIREG:
1667                         ret = phylink_phy_read(pl, mii->phy_id, mii->reg_num);
1668                         if (ret >= 0) {
1669                                 mii->val_out = ret;
1670                                 ret = 0;
1671                         }
1672                         break;
1673
1674                 case SIOCSMIIREG:
1675                         ret = phylink_phy_write(pl, mii->phy_id, mii->reg_num,
1676                                                 mii->val_in);
1677                         break;
1678
1679                 default:
1680                         ret = phy_mii_ioctl(pl->phydev, ifr, cmd);
1681                         break;
1682                 }
1683         } else {
1684                 switch (cmd) {
1685                 case SIOCGMIIPHY:
1686                         mii->phy_id = 0;
1687                         /* fall through */
1688
1689                 case SIOCGMIIREG:
1690                         ret = phylink_mii_read(pl, mii->phy_id, mii->reg_num);
1691                         if (ret >= 0) {
1692                                 mii->val_out = ret;
1693                                 ret = 0;
1694                         }
1695                         break;
1696
1697                 case SIOCSMIIREG:
1698                         ret = phylink_mii_write(pl, mii->phy_id, mii->reg_num,
1699                                                 mii->val_in);
1700                         break;
1701
1702                 default:
1703                         ret = -EOPNOTSUPP;
1704                         break;
1705                 }
1706         }
1707
1708         return ret;
1709 }
1710 EXPORT_SYMBOL_GPL(phylink_mii_ioctl);
1711
1712 static void phylink_sfp_attach(void *upstream, struct sfp_bus *bus)
1713 {
1714         struct phylink *pl = upstream;
1715
1716         pl->netdev->sfp_bus = bus;
1717 }
1718
1719 static void phylink_sfp_detach(void *upstream, struct sfp_bus *bus)
1720 {
1721         struct phylink *pl = upstream;
1722
1723         pl->netdev->sfp_bus = NULL;
1724 }
1725
1726 static int phylink_sfp_config(struct phylink *pl, u8 mode,
1727                               const unsigned long *supported,
1728                               const unsigned long *advertising)
1729 {
1730         __ETHTOOL_DECLARE_LINK_MODE_MASK(support1);
1731         __ETHTOOL_DECLARE_LINK_MODE_MASK(support);
1732         struct phylink_link_state config;
1733         phy_interface_t iface;
1734         bool changed;
1735         int ret;
1736
1737         linkmode_copy(support, supported);
1738
1739         memset(&config, 0, sizeof(config));
1740         linkmode_copy(config.advertising, advertising);
1741         config.interface = PHY_INTERFACE_MODE_NA;
1742         config.speed = SPEED_UNKNOWN;
1743         config.duplex = DUPLEX_UNKNOWN;
1744         config.pause = MLO_PAUSE_AN;
1745         config.an_enabled = pl->link_config.an_enabled;
1746
1747         /* Ignore errors if we're expecting a PHY to attach later */
1748         ret = phylink_validate(pl, support, &config);
1749         if (ret) {
1750                 phylink_err(pl, "validation with support %*pb failed: %d\n",
1751                             __ETHTOOL_LINK_MODE_MASK_NBITS, support, ret);
1752                 return ret;
1753         }
1754
1755         iface = sfp_select_interface(pl->sfp_bus, config.advertising);
1756         if (iface == PHY_INTERFACE_MODE_NA) {
1757                 phylink_err(pl,
1758                             "selection of interface failed, advertisement %*pb\n",
1759                             __ETHTOOL_LINK_MODE_MASK_NBITS, config.advertising);
1760                 return -EINVAL;
1761         }
1762
1763         config.interface = iface;
1764         linkmode_copy(support1, support);
1765         ret = phylink_validate(pl, support1, &config);
1766         if (ret) {
1767                 phylink_err(pl, "validation of %s/%s with support %*pb failed: %d\n",
1768                             phylink_an_mode_str(mode),
1769                             phy_modes(config.interface),
1770                             __ETHTOOL_LINK_MODE_MASK_NBITS, support, ret);
1771                 return ret;
1772         }
1773
1774         phylink_dbg(pl, "requesting link mode %s/%s with support %*pb\n",
1775                     phylink_an_mode_str(mode), phy_modes(config.interface),
1776                     __ETHTOOL_LINK_MODE_MASK_NBITS, support);
1777
1778         if (phy_interface_mode_is_8023z(iface) && pl->phydev)
1779                 return -EINVAL;
1780
1781         changed = !linkmode_equal(pl->supported, support);
1782         if (changed) {
1783                 linkmode_copy(pl->supported, support);
1784                 linkmode_copy(pl->link_config.advertising, config.advertising);
1785         }
1786
1787         if (pl->cur_link_an_mode != mode ||
1788             pl->link_config.interface != config.interface) {
1789                 pl->link_config.interface = config.interface;
1790                 pl->cur_link_an_mode = mode;
1791
1792                 changed = true;
1793
1794                 phylink_info(pl, "switched to %s/%s link mode\n",
1795                              phylink_an_mode_str(mode),
1796                              phy_modes(config.interface));
1797         }
1798
1799         pl->link_port = pl->sfp_port;
1800
1801         if (changed && !test_bit(PHYLINK_DISABLE_STOPPED,
1802                                  &pl->phylink_disable_state))
1803                 phylink_mac_config(pl, &pl->link_config);
1804
1805         return ret;
1806 }
1807
1808 static int phylink_sfp_module_insert(void *upstream,
1809                                      const struct sfp_eeprom_id *id)
1810 {
1811         struct phylink *pl = upstream;
1812         unsigned long *support = pl->sfp_support;
1813
1814         ASSERT_RTNL();
1815
1816         linkmode_zero(support);
1817         sfp_parse_support(pl->sfp_bus, id, support);
1818         pl->sfp_port = sfp_parse_port(pl->sfp_bus, id, support);
1819
1820         /* If this module may have a PHY connecting later, defer until later */
1821         pl->sfp_may_have_phy = sfp_may_have_phy(pl->sfp_bus, id);
1822         if (pl->sfp_may_have_phy)
1823                 return 0;
1824
1825         return phylink_sfp_config(pl, MLO_AN_INBAND, support, support);
1826 }
1827
1828 static int phylink_sfp_module_start(void *upstream)
1829 {
1830         struct phylink *pl = upstream;
1831
1832         /* If this SFP module has a PHY, start the PHY now. */
1833         if (pl->phydev) {
1834                 phy_start(pl->phydev);
1835                 return 0;
1836         }
1837
1838         /* If the module may have a PHY but we didn't detect one we
1839          * need to configure the MAC here.
1840          */
1841         if (!pl->sfp_may_have_phy)
1842                 return 0;
1843
1844         return phylink_sfp_config(pl, MLO_AN_INBAND,
1845                                   pl->sfp_support, pl->sfp_support);
1846 }
1847
1848 static void phylink_sfp_module_stop(void *upstream)
1849 {
1850         struct phylink *pl = upstream;
1851
1852         /* If this SFP module has a PHY, stop it. */
1853         if (pl->phydev)
1854                 phy_stop(pl->phydev);
1855 }
1856
1857 static void phylink_sfp_link_down(void *upstream)
1858 {
1859         struct phylink *pl = upstream;
1860
1861         ASSERT_RTNL();
1862
1863         phylink_run_resolve_and_disable(pl, PHYLINK_DISABLE_LINK);
1864 }
1865
1866 static void phylink_sfp_link_up(void *upstream)
1867 {
1868         struct phylink *pl = upstream;
1869
1870         ASSERT_RTNL();
1871
1872         clear_bit(PHYLINK_DISABLE_LINK, &pl->phylink_disable_state);
1873         phylink_run_resolve(pl);
1874 }
1875
1876 /* The Broadcom BCM84881 in the Methode DM7052 is unable to provide a SGMII
1877  * or 802.3z control word, so inband will not work.
1878  */
1879 static bool phylink_phy_no_inband(struct phy_device *phy)
1880 {
1881         return phy->is_c45 &&
1882                 (phy->c45_ids.device_ids[1] & 0xfffffff0) == 0xae025150;
1883 }
1884
1885 static int phylink_sfp_connect_phy(void *upstream, struct phy_device *phy)
1886 {
1887         struct phylink *pl = upstream;
1888         phy_interface_t interface;
1889         u8 mode;
1890         int ret;
1891
1892         /*
1893          * This is the new way of dealing with flow control for PHYs,
1894          * as described by Timur Tabi in commit 529ed1275263 ("net: phy:
1895          * phy drivers should not set SUPPORTED_[Asym_]Pause") except
1896          * using our validate call to the MAC, we rely upon the MAC
1897          * clearing the bits from both supported and advertising fields.
1898          */
1899         phy_support_asym_pause(phy);
1900
1901         if (phylink_phy_no_inband(phy))
1902                 mode = MLO_AN_PHY;
1903         else
1904                 mode = MLO_AN_INBAND;
1905
1906         /* Do the initial configuration */
1907         ret = phylink_sfp_config(pl, mode, phy->supported, phy->advertising);
1908         if (ret < 0)
1909                 return ret;
1910
1911         interface = pl->link_config.interface;
1912         ret = phylink_attach_phy(pl, phy, interface);
1913         if (ret < 0)
1914                 return ret;
1915
1916         ret = phylink_bringup_phy(pl, phy, interface);
1917         if (ret)
1918                 phy_detach(phy);
1919
1920         return ret;
1921 }
1922
1923 static void phylink_sfp_disconnect_phy(void *upstream)
1924 {
1925         phylink_disconnect_phy(upstream);
1926 }
1927
1928 static const struct sfp_upstream_ops sfp_phylink_ops = {
1929         .attach = phylink_sfp_attach,
1930         .detach = phylink_sfp_detach,
1931         .module_insert = phylink_sfp_module_insert,
1932         .module_start = phylink_sfp_module_start,
1933         .module_stop = phylink_sfp_module_stop,
1934         .link_up = phylink_sfp_link_up,
1935         .link_down = phylink_sfp_link_down,
1936         .connect_phy = phylink_sfp_connect_phy,
1937         .disconnect_phy = phylink_sfp_disconnect_phy,
1938 };
1939
1940 /* Helpers for MAC drivers */
1941
1942 /**
1943  * phylink_helper_basex_speed() - 1000BaseX/2500BaseX helper
1944  * @state: a pointer to a &struct phylink_link_state
1945  *
1946  * Inspect the interface mode, advertising mask or forced speed and
1947  * decide whether to run at 2.5Gbit or 1Gbit appropriately, switching
1948  * the interface mode to suit.  @state->interface is appropriately
1949  * updated, and the advertising mask has the "other" baseX_Full flag
1950  * cleared.
1951  */
1952 void phylink_helper_basex_speed(struct phylink_link_state *state)
1953 {
1954         if (phy_interface_mode_is_8023z(state->interface)) {
1955                 bool want_2500 = state->an_enabled ?
1956                         phylink_test(state->advertising, 2500baseX_Full) :
1957                         state->speed == SPEED_2500;
1958
1959                 if (want_2500) {
1960                         phylink_clear(state->advertising, 1000baseX_Full);
1961                         state->interface = PHY_INTERFACE_MODE_2500BASEX;
1962                 } else {
1963                         phylink_clear(state->advertising, 2500baseX_Full);
1964                         state->interface = PHY_INTERFACE_MODE_1000BASEX;
1965                 }
1966         }
1967 }
1968 EXPORT_SYMBOL_GPL(phylink_helper_basex_speed);
1969
1970 MODULE_LICENSE("GPL v2");