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_gpiod_get_index(fixed_node, "link", 0,
 190                                                       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                 case PHY_INTERFACE_MODE_QSGMII:
 285                         phylink_set(pl->supported, 10baseT_Half);
 286                         phylink_set(pl->supported, 10baseT_Full);
 287                         phylink_set(pl->supported, 100baseT_Half);
 288                         phylink_set(pl->supported, 100baseT_Full);
 289                         phylink_set(pl->supported, 1000baseT_Half);
 290                         phylink_set(pl->supported, 1000baseT_Full);
 291                         break;
 292
 293                 case PHY_INTERFACE_MODE_1000BASEX:
 294                         phylink_set(pl->supported, 1000baseX_Full);
 295                         break;
 296
 297                 case PHY_INTERFACE_MODE_2500BASEX:
 298                         phylink_set(pl->supported, 2500baseX_Full);
 299                         break;
 300
 301                 case PHY_INTERFACE_MODE_USXGMII:
 302                 case PHY_INTERFACE_MODE_10GKR:
 303                 case PHY_INTERFACE_MODE_10GBASER:
 304                         phylink_set(pl->supported, 10baseT_Half);
 305                         phylink_set(pl->supported, 10baseT_Full);
 306                         phylink_set(pl->supported, 100baseT_Half);
 307                         phylink_set(pl->supported, 100baseT_Full);
 308                         phylink_set(pl->supported, 1000baseT_Half);
 309                         phylink_set(pl->supported, 1000baseT_Full);
 310                         phylink_set(pl->supported, 1000baseX_Full);
 311                         phylink_set(pl->supported, 2500baseT_Full);
 312                         phylink_set(pl->supported, 2500baseX_Full);
 313                         phylink_set(pl->supported, 5000baseT_Full);
 314                         phylink_set(pl->supported, 10000baseT_Full);
 315                         phylink_set(pl->supported, 10000baseKR_Full);
 316                         phylink_set(pl->supported, 10000baseCR_Full);
 317                         phylink_set(pl->supported, 10000baseSR_Full);
 318                         phylink_set(pl->supported, 10000baseLR_Full);
 319                         phylink_set(pl->supported, 10000baseLRM_Full);
 320                         phylink_set(pl->supported, 10000baseER_Full);
 321                         break;
 322
 323                 default:
 324                         phylink_err(pl,
 325                                     "incorrect link mode %s for in-band status\n",
 326                                     phy_modes(pl->link_config.interface));
 327                         return -EINVAL;
 328                 }
 329
 330                 linkmode_copy(pl->link_config.advertising, pl->supported);
 331
 332                 if (phylink_validate(pl, pl->supported, &pl->link_config)) {
 333                         phylink_err(pl,
 334                                     "failed to validate link configuration for in-band status\n");
 335                         return -EINVAL;
 336                 }
 337         }
 338
 339         return 0;
 340 }
 341
 342 static void phylink_mac_config(struct phylink *pl,
 343                                const struct phylink_link_state *state)
 344 {
 345         phylink_dbg(pl,
 346                     "%s: mode=%s/%s/%s/%s adv=%*pb pause=%02x link=%u an=%u\n",
 347                     __func__, phylink_an_mode_str(pl->cur_link_an_mode),
 348                     phy_modes(state->interface),
 349                     phy_speed_to_str(state->speed),
 350                     phy_duplex_to_str(state->duplex),
 351                     __ETHTOOL_LINK_MODE_MASK_NBITS, state->advertising,
 352                     state->pause, state->link, state->an_enabled);
 353
 354         pl->ops->mac_config(pl->config, pl->cur_link_an_mode, state);
 355 }
 356
 357 static void phylink_mac_config_up(struct phylink *pl,
 358                                   const struct phylink_link_state *state)
 359 {
 360         if (state->link)
 361                 phylink_mac_config(pl, state);
 362 }
 363
 364 static void phylink_mac_an_restart(struct phylink *pl)
 365 {
 366         if (pl->link_config.an_enabled &&
 367             phy_interface_mode_is_8023z(pl->link_config.interface))
 368                 pl->ops->mac_an_restart(pl->config);
 369 }
 370
 371 static void phylink_mac_pcs_get_state(struct phylink *pl,
 372                                       struct phylink_link_state *state)
 373 {
 374         linkmode_copy(state->advertising, pl->link_config.advertising);
 375         linkmode_zero(state->lp_advertising);
 376         state->interface = pl->link_config.interface;
 377         state->an_enabled = pl->link_config.an_enabled;
 378         state->speed = SPEED_UNKNOWN;
 379         state->duplex = DUPLEX_UNKNOWN;
 380         state->pause = MLO_PAUSE_NONE;
 381         state->an_complete = 0;
 382         state->link = 1;
 383
 384         pl->ops->mac_pcs_get_state(pl->config, state);
 385 }
 386
 387 /* The fixed state is... fixed except for the link state,
 388  * which may be determined by a GPIO or a callback.
 389  */
 390 static void phylink_get_fixed_state(struct phylink *pl, struct phylink_link_state *state)
 391 {
 392         *state = pl->link_config;
 393         if (pl->get_fixed_state)
 394                 pl->get_fixed_state(pl->netdev, state);
 395         else if (pl->link_gpio)
 396                 state->link = !!gpiod_get_value_cansleep(pl->link_gpio);
 397 }
 398
 399 /* Flow control is resolved according to our and the link partners
 400  * advertisements using the following drawn from the 802.3 specs:
 401  *  Local device  Link partner
 402  *  Pause AsymDir Pause AsymDir Result
 403  *    1     X       1     X     TX+RX
 404  *    0     1       1     1     TX
 405  *    1     1       0     1     RX
 406  */
 407 static void phylink_resolve_flow(struct phylink *pl,
 408                                  struct phylink_link_state *state)
 409 {
 410         int new_pause = 0;
 411
 412         if (pl->link_config.pause & MLO_PAUSE_AN) {
 413                 int pause = 0;
 414
 415                 if (phylink_test(pl->link_config.advertising, Pause))
 416                         pause |= MLO_PAUSE_SYM;
 417                 if (phylink_test(pl->link_config.advertising, Asym_Pause))
 418                         pause |= MLO_PAUSE_ASYM;
 419
 420                 pause &= state->pause;
 421
 422                 if (pause & MLO_PAUSE_SYM)
 423                         new_pause = MLO_PAUSE_TX | MLO_PAUSE_RX;
 424                 else if (pause & MLO_PAUSE_ASYM)
 425                         new_pause = state->pause & MLO_PAUSE_SYM ?
 426                                  MLO_PAUSE_TX : MLO_PAUSE_RX;
 427         } else {
 428                 new_pause = pl->link_config.pause & MLO_PAUSE_TXRX_MASK;
 429         }
 430
 431         state->pause &= ~MLO_PAUSE_TXRX_MASK;
 432         state->pause |= new_pause;
 433 }
 434
 435 static const char *phylink_pause_to_str(int pause)
 436 {
 437         switch (pause & MLO_PAUSE_TXRX_MASK) {
 438         case MLO_PAUSE_TX | MLO_PAUSE_RX:
 439                 return "rx/tx";
 440         case MLO_PAUSE_TX:
 441                 return "tx";
 442         case MLO_PAUSE_RX:
 443                 return "rx";
 444         default:
 445                 return "off";
 446         }
 447 }
 448
 449 static void phylink_mac_link_up(struct phylink *pl,
 450                                 struct phylink_link_state link_state)
 451 {
 452         struct net_device *ndev = pl->netdev;
 453
 454         pl->cur_interface = link_state.interface;
 455         pl->ops->mac_link_up(pl->config, pl->cur_link_an_mode,
 456                              pl->cur_interface, pl->phydev);
 457
 458         if (ndev)
 459                 netif_carrier_on(ndev);
 460
 461         phylink_info(pl,
 462                      "Link is Up - %s/%s - flow control %s\n",
 463                      phy_speed_to_str(link_state.speed),
 464                      phy_duplex_to_str(link_state.duplex),
 465                      phylink_pause_to_str(link_state.pause));
 466 }
 467
 468 static void phylink_mac_link_down(struct phylink *pl)
 469 {
 470         struct net_device *ndev = pl->netdev;
 471
 472         if (ndev)
 473                 netif_carrier_off(ndev);
 474         pl->ops->mac_link_down(pl->config, pl->cur_link_an_mode,
 475                                pl->cur_interface);
 476         phylink_info(pl, "Link is Down\n");
 477 }
 478
 479 static void phylink_resolve(struct work_struct *w)
 480 {
 481         struct phylink *pl = container_of(w, struct phylink, resolve);
 482         struct phylink_link_state link_state;
 483         struct net_device *ndev = pl->netdev;
 484         int link_changed;
 485
 486         mutex_lock(&pl->state_mutex);
 487         if (pl->phylink_disable_state) {
 488                 pl->mac_link_dropped = false;
 489                 link_state.link = false;
 490         } else if (pl->mac_link_dropped) {
 491                 link_state.link = false;
 492         } else {
 493                 switch (pl->cur_link_an_mode) {
 494                 case MLO_AN_PHY:
 495                         link_state = pl->phy_state;
 496                         phylink_resolve_flow(pl, &link_state);
 497                         phylink_mac_config_up(pl, &link_state);
 498                         break;
 499
 500                 case MLO_AN_FIXED:
 501                         phylink_get_fixed_state(pl, &link_state);
 502                         phylink_mac_config_up(pl, &link_state);
 503                         break;
 504
 505                 case MLO_AN_INBAND:
 506                         phylink_mac_pcs_get_state(pl, &link_state);
 507
 508                         /* If we have a phy, the "up" state is the union of
 509                          * both the PHY and the MAC */
 510                         if (pl->phydev)
 511                                 link_state.link &= pl->phy_state.link;
 512
 513                         /* Only update if the PHY link is up */
 514                         if (pl->phydev && pl->phy_state.link) {
 515                                 link_state.interface = pl->phy_state.interface;
 516
 517                                 /* If we have a PHY, we need to update with
 518                                  * the pause mode bits. */
 519                                 link_state.pause |= pl->phy_state.pause;
 520                                 phylink_resolve_flow(pl, &link_state);
 521                                 phylink_mac_config(pl, &link_state);
 522                         }
 523                         break;
 524                 }
 525         }
 526
 527         if (pl->netdev)
 528                 link_changed = (link_state.link != netif_carrier_ok(ndev));
 529         else
 530                 link_changed = (link_state.link != pl->old_link_state);
 531
 532         if (link_changed) {
 533                 pl->old_link_state = link_state.link;
 534                 if (!link_state.link)
 535                         phylink_mac_link_down(pl);
 536                 else
 537                         phylink_mac_link_up(pl, link_state);
 538         }
 539         if (!link_state.link && pl->mac_link_dropped) {
 540                 pl->mac_link_dropped = false;
 541                 queue_work(system_power_efficient_wq, &pl->resolve);
 542         }
 543         mutex_unlock(&pl->state_mutex);
 544 }
 545
 546 static void phylink_run_resolve(struct phylink *pl)
 547 {
 548         if (!pl->phylink_disable_state)
 549                 queue_work(system_power_efficient_wq, &pl->resolve);
 550 }
 551
 552 static void phylink_run_resolve_and_disable(struct phylink *pl, int bit)
 553 {
 554         unsigned long state = pl->phylink_disable_state;
 555
 556         set_bit(bit, &pl->phylink_disable_state);
 557         if (state == 0) {
 558                 queue_work(system_power_efficient_wq, &pl->resolve);
 559                 flush_work(&pl->resolve);
 560         }
 561 }
 562
 563 static void phylink_fixed_poll(struct timer_list *t)
 564 {
 565         struct phylink *pl = container_of(t, struct phylink, link_poll);
 566
 567         mod_timer(t, jiffies + HZ);
 568
 569         phylink_run_resolve(pl);
 570 }
 571
 572 static const struct sfp_upstream_ops sfp_phylink_ops;
 573
 574 static int phylink_register_sfp(struct phylink *pl,
 575                                 struct fwnode_handle *fwnode)
 576 {
 577         struct sfp_bus *bus;
 578         int ret;
 579
 580         if (!fwnode)
 581                 return 0;
 582
 583         bus = sfp_bus_find_fwnode(fwnode);
 584         if (IS_ERR(bus)) {
 585                 ret = PTR_ERR(bus);
 586                 phylink_err(pl, "unable to attach SFP bus: %d\n", ret);
 587                 return ret;
 588         }
 589
 590         pl->sfp_bus = bus;
 591
 592         ret = sfp_bus_add_upstream(bus, pl, &sfp_phylink_ops);
 593         sfp_bus_put(bus);
 594
 595         return ret;
 596 }
 597
 598 /**
 599  * phylink_create() - create a phylink instance
 600  * @config: a pointer to the target &struct phylink_config
 601  * @fwnode: a pointer to a &struct fwnode_handle describing the network
 602  *      interface
 603  * @iface: the desired link mode defined by &typedef phy_interface_t
 604  * @ops: a pointer to a &struct phylink_mac_ops for the MAC.
 605  *
 606  * Create a new phylink instance, and parse the link parameters found in @np.
 607  * This will parse in-band modes, fixed-link or SFP configuration.
 608  *
 609  * Note: the rtnl lock must not be held when calling this function.
 610  *
 611  * Returns a pointer to a &struct phylink, or an error-pointer value. Users
 612  * must use IS_ERR() to check for errors from this function.
 613  */
 614 struct phylink *phylink_create(struct phylink_config *config,
 615                                struct fwnode_handle *fwnode,
 616                                phy_interface_t iface,
 617                                const struct phylink_mac_ops *ops)
 618 {
 619         struct phylink *pl;
 620         int ret;
 621
 622         pl = kzalloc(sizeof(*pl), GFP_KERNEL);
 623         if (!pl)
 624                 return ERR_PTR(-ENOMEM);
 625
 626         mutex_init(&pl->state_mutex);
 627         INIT_WORK(&pl->resolve, phylink_resolve);
 628
 629         pl->config = config;
 630         if (config->type == PHYLINK_NETDEV) {
 631                 pl->netdev = to_net_dev(config->dev);
 632         } else if (config->type == PHYLINK_DEV) {
 633                 pl->dev = config->dev;
 634         } else {
 635                 kfree(pl);
 636                 return ERR_PTR(-EINVAL);
 637         }
 638
 639         pl->phy_state.interface = iface;
 640         pl->link_interface = iface;
 641         if (iface == PHY_INTERFACE_MODE_MOCA)
 642                 pl->link_port = PORT_BNC;
 643         else
 644                 pl->link_port = PORT_MII;
 645         pl->link_config.interface = iface;
 646         pl->link_config.pause = MLO_PAUSE_AN;
 647         pl->link_config.speed = SPEED_UNKNOWN;
 648         pl->link_config.duplex = DUPLEX_UNKNOWN;
 649         pl->link_config.an_enabled = true;
 650         pl->ops = ops;
 651         __set_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
 652         timer_setup(&pl->link_poll, phylink_fixed_poll, 0);
 653
 654         bitmap_fill(pl->supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
 655         linkmode_copy(pl->link_config.advertising, pl->supported);
 656         phylink_validate(pl, pl->supported, &pl->link_config);
 657
 658         ret = phylink_parse_mode(pl, fwnode);
 659         if (ret < 0) {
 660                 kfree(pl);
 661                 return ERR_PTR(ret);
 662         }
 663
 664         if (pl->cfg_link_an_mode == MLO_AN_FIXED) {
 665                 ret = phylink_parse_fixedlink(pl, fwnode);
 666                 if (ret < 0) {
 667                         kfree(pl);
 668                         return ERR_PTR(ret);
 669                 }
 670         }
 671
 672         pl->cur_link_an_mode = pl->cfg_link_an_mode;
 673
 674         ret = phylink_register_sfp(pl, fwnode);
 675         if (ret < 0) {
 676                 kfree(pl);
 677                 return ERR_PTR(ret);
 678         }
 679
 680         return pl;
 681 }
 682 EXPORT_SYMBOL_GPL(phylink_create);
 683
 684 /**
 685  * phylink_destroy() - cleanup and destroy the phylink instance
 686  * @pl: a pointer to a &struct phylink returned from phylink_create()
 687  *
 688  * Destroy a phylink instance. Any PHY that has been attached must have been
 689  * cleaned up via phylink_disconnect_phy() prior to calling this function.
 690  *
 691  * Note: the rtnl lock must not be held when calling this function.
 692  */
 693 void phylink_destroy(struct phylink *pl)
 694 {
 695         sfp_bus_del_upstream(pl->sfp_bus);
 696         if (pl->link_gpio)
 697                 gpiod_put(pl->link_gpio);
 698
 699         cancel_work_sync(&pl->resolve);
 700         kfree(pl);
 701 }
 702 EXPORT_SYMBOL_GPL(phylink_destroy);
 703
 704 static void phylink_phy_change(struct phy_device *phydev, bool up,
 705                                bool do_carrier)
 706 {
 707         struct phylink *pl = phydev->phylink;
 708
 709         mutex_lock(&pl->state_mutex);
 710         pl->phy_state.speed = phydev->speed;
 711         pl->phy_state.duplex = phydev->duplex;
 712         pl->phy_state.pause = MLO_PAUSE_NONE;
 713         if (phydev->pause)
 714                 pl->phy_state.pause |= MLO_PAUSE_SYM;
 715         if (phydev->asym_pause)
 716                 pl->phy_state.pause |= MLO_PAUSE_ASYM;
 717         pl->phy_state.interface = phydev->interface;
 718         pl->phy_state.link = up;
 719         mutex_unlock(&pl->state_mutex);
 720
 721         phylink_run_resolve(pl);
 722
 723         phylink_dbg(pl, "phy link %s %s/%s/%s\n", up ? "up" : "down",
 724                     phy_modes(phydev->interface),
 725                     phy_speed_to_str(phydev->speed),
 726                     phy_duplex_to_str(phydev->duplex));
 727 }
 728
 729 static int phylink_bringup_phy(struct phylink *pl, struct phy_device *phy,
 730                                phy_interface_t interface)
 731 {
 732         struct phylink_link_state config;
 733         __ETHTOOL_DECLARE_LINK_MODE_MASK(supported);
 734         char *irq_str;
 735         int ret;
 736
 737         /*
 738          * This is the new way of dealing with flow control for PHYs,
 739          * as described by Timur Tabi in commit 529ed1275263 ("net: phy:
 740          * phy drivers should not set SUPPORTED_[Asym_]Pause") except
 741          * using our validate call to the MAC, we rely upon the MAC
 742          * clearing the bits from both supported and advertising fields.
 743          */
 744         phy_support_asym_pause(phy);
 745
 746         memset(&config, 0, sizeof(config));
 747         linkmode_copy(supported, phy->supported);
 748         linkmode_copy(config.advertising, phy->advertising);
 749
 750         /* Clause 45 PHYs switch their Serdes lane between several different
 751          * modes, normally 10GBASE-R, SGMII. Some use 2500BASE-X for 2.5G
 752          * speeds. We really need to know which interface modes the PHY and
 753          * MAC supports to properly work out which linkmodes can be supported.
 754          */
 755         if (phy->is_c45 &&
 756             interface != PHY_INTERFACE_MODE_RXAUI &&
 757             interface != PHY_INTERFACE_MODE_XAUI &&
 758             interface != PHY_INTERFACE_MODE_USXGMII)
 759                 config.interface = PHY_INTERFACE_MODE_NA;
 760         else
 761                 config.interface = interface;
 762
 763         ret = phylink_validate(pl, supported, &config);
 764         if (ret)
 765                 return ret;
 766
 767         phy->phylink = pl;
 768         phy->phy_link_change = phylink_phy_change;
 769
 770         irq_str = phy_attached_info_irq(phy);
 771         phylink_info(pl,
 772                      "PHY [%s] driver [%s] (irq=%s)\n",
 773                      dev_name(&phy->mdio.dev), phy->drv->name, irq_str);
 774         kfree(irq_str);
 775
 776         mutex_lock(&phy->lock);
 777         mutex_lock(&pl->state_mutex);
 778         pl->phydev = phy;
 779         pl->phy_state.interface = interface;
 780         linkmode_copy(pl->supported, supported);
 781         linkmode_copy(pl->link_config.advertising, config.advertising);
 782
 783         /* Restrict the phy advertisement according to the MAC support. */
 784         linkmode_copy(phy->advertising, config.advertising);
 785         mutex_unlock(&pl->state_mutex);
 786         mutex_unlock(&phy->lock);
 787
 788         phylink_dbg(pl,
 789                     "phy: setting supported %*pb advertising %*pb\n",
 790                     __ETHTOOL_LINK_MODE_MASK_NBITS, pl->supported,
 791                     __ETHTOOL_LINK_MODE_MASK_NBITS, phy->advertising);
 792
 793         if (phy_interrupt_is_valid(phy))
 794                 phy_request_interrupt(phy);
 795
 796         return 0;
 797 }
 798
 799 static int phylink_attach_phy(struct phylink *pl, struct phy_device *phy,
 800                               phy_interface_t interface)
 801 {
 802         if (WARN_ON(pl->cfg_link_an_mode == MLO_AN_FIXED ||
 803                     (pl->cfg_link_an_mode == MLO_AN_INBAND &&
 804                      phy_interface_mode_is_8023z(interface))))
 805                 return -EINVAL;
 806
 807         if (pl->phydev)
 808                 return -EBUSY;
 809
 810         return phy_attach_direct(pl->netdev, phy, 0, interface);
 811 }
 812
 813 /**
 814  * phylink_connect_phy() - connect a PHY to the phylink instance
 815  * @pl: a pointer to a &struct phylink returned from phylink_create()
 816  * @phy: a pointer to a &struct phy_device.
 817  *
 818  * Connect @phy to the phylink instance specified by @pl by calling
 819  * phy_attach_direct(). Configure the @phy according to the MAC driver's
 820  * capabilities, start the PHYLIB state machine and enable any interrupts
 821  * that the PHY supports.
 822  *
 823  * This updates the phylink's ethtool supported and advertising link mode
 824  * masks.
 825  *
 826  * Returns 0 on success or a negative errno.
 827  */
 828 int phylink_connect_phy(struct phylink *pl, struct phy_device *phy)
 829 {
 830         int ret;
 831
 832         /* Use PHY device/driver interface */
 833         if (pl->link_interface == PHY_INTERFACE_MODE_NA) {
 834                 pl->link_interface = phy->interface;
 835                 pl->link_config.interface = pl->link_interface;
 836         }
 837
 838         ret = phylink_attach_phy(pl, phy, pl->link_interface);
 839         if (ret < 0)
 840                 return ret;
 841
 842         ret = phylink_bringup_phy(pl, phy, pl->link_config.interface);
 843         if (ret)
 844                 phy_detach(phy);
 845
 846         return ret;
 847 }
 848 EXPORT_SYMBOL_GPL(phylink_connect_phy);
 849
 850 /**
 851  * phylink_of_phy_connect() - connect the PHY specified in the DT mode.
 852  * @pl: a pointer to a &struct phylink returned from phylink_create()
 853  * @dn: a pointer to a &struct device_node.
 854  * @flags: PHY-specific flags to communicate to the PHY device driver
 855  *
 856  * Connect the phy specified in the device node @dn to the phylink instance
 857  * specified by @pl. Actions specified in phylink_connect_phy() will be
 858  * performed.
 859  *
 860  * Returns 0 on success or a negative errno.
 861  */
 862 int phylink_of_phy_connect(struct phylink *pl, struct device_node *dn,
 863                            u32 flags)
 864 {
 865         struct device_node *phy_node;
 866         struct phy_device *phy_dev;
 867         int ret;
 868
 869         /* Fixed links and 802.3z are handled without needing a PHY */
 870         if (pl->cfg_link_an_mode == MLO_AN_FIXED ||
 871             (pl->cfg_link_an_mode == MLO_AN_INBAND &&
 872              phy_interface_mode_is_8023z(pl->link_interface)))
 873                 return 0;
 874
 875         phy_node = of_parse_phandle(dn, "phy-handle", 0);
 876         if (!phy_node)
 877                 phy_node = of_parse_phandle(dn, "phy", 0);
 878         if (!phy_node)
 879                 phy_node = of_parse_phandle(dn, "phy-device", 0);
 880
 881         if (!phy_node) {
 882                 if (pl->cfg_link_an_mode == MLO_AN_PHY)
 883                         return -ENODEV;
 884                 return 0;
 885         }
 886
 887         phy_dev = of_phy_find_device(phy_node);
 888         /* We're done with the phy_node handle */
 889         of_node_put(phy_node);
 890         if (!phy_dev)
 891                 return -ENODEV;
 892
 893         ret = phy_attach_direct(pl->netdev, phy_dev, flags,
 894                                 pl->link_interface);
 895         if (ret)
 896                 return ret;
 897
 898         ret = phylink_bringup_phy(pl, phy_dev, pl->link_config.interface);
 899         if (ret)
 900                 phy_detach(phy_dev);
 901
 902         return ret;
 903 }
 904 EXPORT_SYMBOL_GPL(phylink_of_phy_connect);
 905
 906 /**
 907  * phylink_disconnect_phy() - disconnect any PHY attached to the phylink
 908  *   instance.
 909  * @pl: a pointer to a &struct phylink returned from phylink_create()
 910  *
 911  * Disconnect any current PHY from the phylink instance described by @pl.
 912  */
 913 void phylink_disconnect_phy(struct phylink *pl)
 914 {
 915         struct phy_device *phy;
 916
 917         ASSERT_RTNL();
 918
 919         phy = pl->phydev;
 920         if (phy) {
 921                 mutex_lock(&phy->lock);
 922                 mutex_lock(&pl->state_mutex);
 923                 pl->phydev = NULL;
 924                 mutex_unlock(&pl->state_mutex);
 925                 mutex_unlock(&phy->lock);
 926                 flush_work(&pl->resolve);
 927
 928                 phy_disconnect(phy);
 929         }
 930 }
 931 EXPORT_SYMBOL_GPL(phylink_disconnect_phy);
 932
 933 /**
 934  * phylink_fixed_state_cb() - allow setting a fixed link callback
 935  * @pl: a pointer to a &struct phylink returned from phylink_create()
 936  * @cb: callback to execute to determine the fixed link state.
 937  *
 938  * The MAC driver should call this driver when the state of its link
 939  * can be determined through e.g: an out of band MMIO register.
 940  */
 941 int phylink_fixed_state_cb(struct phylink *pl,
 942                            void (*cb)(struct net_device *dev,
 943                                       struct phylink_link_state *state))
 944 {
 945         /* It does not make sense to let the link be overriden unless we use
 946          * MLO_AN_FIXED
 947          */
 948         if (pl->cfg_link_an_mode != MLO_AN_FIXED)
 949                 return -EINVAL;
 950
 951         mutex_lock(&pl->state_mutex);
 952         pl->get_fixed_state = cb;
 953         mutex_unlock(&pl->state_mutex);
 954
 955         return 0;
 956 }
 957 EXPORT_SYMBOL_GPL(phylink_fixed_state_cb);
 958
 959 /**
 960  * phylink_mac_change() - notify phylink of a change in MAC state
 961  * @pl: a pointer to a &struct phylink returned from phylink_create()
 962  * @up: indicates whether the link is currently up.
 963  *
 964  * The MAC driver should call this driver when the state of its link
 965  * changes (eg, link failure, new negotiation results, etc.)
 966  */
 967 void phylink_mac_change(struct phylink *pl, bool up)
 968 {
 969         if (!up)
 970                 pl->mac_link_dropped = true;
 971         phylink_run_resolve(pl);
 972         phylink_dbg(pl, "mac link %s\n", up ? "up" : "down");
 973 }
 974 EXPORT_SYMBOL_GPL(phylink_mac_change);
 975
 976 static irqreturn_t phylink_link_handler(int irq, void *data)
 977 {
 978         struct phylink *pl = data;
 979
 980         phylink_run_resolve(pl);
 981
 982         return IRQ_HANDLED;
 983 }
 984
 985 /**
 986  * phylink_start() - start a phylink instance
 987  * @pl: a pointer to a &struct phylink returned from phylink_create()
 988  *
 989  * Start the phylink instance specified by @pl, configuring the MAC for the
 990  * desired link mode(s) and negotiation style. This should be called from the
 991  * network device driver's &struct net_device_ops ndo_open() method.
 992  */
 993 void phylink_start(struct phylink *pl)
 994 {
 995         ASSERT_RTNL();
 996
 997         phylink_info(pl, "configuring for %s/%s link mode\n",
 998                      phylink_an_mode_str(pl->cur_link_an_mode),
 999                      phy_modes(pl->link_config.interface));
1000
1001         /* Always set the carrier off */
1002         if (pl->netdev)
1003                 netif_carrier_off(pl->netdev);
1004
1005         /* Apply the link configuration to the MAC when starting. This allows
1006          * a fixed-link to start with the correct parameters, and also
1007          * ensures that we set the appropriate advertisement for Serdes links.
1008          */
1009         phylink_resolve_flow(pl, &pl->link_config);
1010         phylink_mac_config(pl, &pl->link_config);
1011
1012         /* Restart autonegotiation if using 802.3z to ensure that the link
1013          * parameters are properly negotiated.  This is necessary for DSA
1014          * switches using 802.3z negotiation to ensure they see our modes.
1015          */
1016         phylink_mac_an_restart(pl);
1017
1018         clear_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
1019         phylink_run_resolve(pl);
1020
1021         if (pl->cfg_link_an_mode == MLO_AN_FIXED && pl->link_gpio) {
1022                 int irq = gpiod_to_irq(pl->link_gpio);
1023
1024                 if (irq > 0) {
1025                         if (!request_irq(irq, phylink_link_handler,
1026                                          IRQF_TRIGGER_RISING |
1027                                          IRQF_TRIGGER_FALLING,
1028                                          "netdev link", pl))
1029                                 pl->link_irq = irq;
1030                         else
1031                                 irq = 0;
1032                 }
1033                 if (irq <= 0)
1034                         mod_timer(&pl->link_poll, jiffies + HZ);
1035         }
1036         if ((pl->cfg_link_an_mode == MLO_AN_FIXED && pl->get_fixed_state) ||
1037             pl->config->pcs_poll)
1038                 mod_timer(&pl->link_poll, jiffies + HZ);
1039         if (pl->phydev)
1040                 phy_start(pl->phydev);
1041         if (pl->sfp_bus)
1042                 sfp_upstream_start(pl->sfp_bus);
1043 }
1044 EXPORT_SYMBOL_GPL(phylink_start);
1045
1046 /**
1047  * phylink_stop() - stop a phylink instance
1048  * @pl: a pointer to a &struct phylink returned from phylink_create()
1049  *
1050  * Stop the phylink instance specified by @pl. This should be called from the
1051  * network device driver's &struct net_device_ops ndo_stop() method.  The
1052  * network device's carrier state should not be changed prior to calling this
1053  * function.
1054  */
1055 void phylink_stop(struct phylink *pl)
1056 {
1057         ASSERT_RTNL();
1058
1059         if (pl->sfp_bus)
1060                 sfp_upstream_stop(pl->sfp_bus);
1061         if (pl->phydev)
1062                 phy_stop(pl->phydev);
1063         del_timer_sync(&pl->link_poll);
1064         if (pl->link_irq) {
1065                 free_irq(pl->link_irq, pl);
1066                 pl->link_irq = 0;
1067         }
1068
1069         phylink_run_resolve_and_disable(pl, PHYLINK_DISABLE_STOPPED);
1070 }
1071 EXPORT_SYMBOL_GPL(phylink_stop);
1072
1073 /**
1074  * phylink_ethtool_get_wol() - get the wake on lan parameters for the PHY
1075  * @pl: a pointer to a &struct phylink returned from phylink_create()
1076  * @wol: a pointer to &struct ethtool_wolinfo to hold the read parameters
1077  *
1078  * Read the wake on lan parameters from the PHY attached to the phylink
1079  * instance specified by @pl. If no PHY is currently attached, report no
1080  * support for wake on lan.
1081  */
1082 void phylink_ethtool_get_wol(struct phylink *pl, struct ethtool_wolinfo *wol)
1083 {
1084         ASSERT_RTNL();
1085
1086         wol->supported = 0;
1087         wol->wolopts = 0;
1088
1089         if (pl->phydev)
1090                 phy_ethtool_get_wol(pl->phydev, wol);
1091 }
1092 EXPORT_SYMBOL_GPL(phylink_ethtool_get_wol);
1093
1094 /**
1095  * phylink_ethtool_set_wol() - set wake on lan parameters
1096  * @pl: a pointer to a &struct phylink returned from phylink_create()
1097  * @wol: a pointer to &struct ethtool_wolinfo for the desired parameters
1098  *
1099  * Set the wake on lan parameters for the PHY attached to the phylink
1100  * instance specified by @pl. If no PHY is attached, returns %EOPNOTSUPP
1101  * error.
1102  *
1103  * Returns zero on success or negative errno code.
1104  */
1105 int phylink_ethtool_set_wol(struct phylink *pl, struct ethtool_wolinfo *wol)
1106 {
1107         int ret = -EOPNOTSUPP;
1108
1109         ASSERT_RTNL();
1110
1111         if (pl->phydev)
1112                 ret = phy_ethtool_set_wol(pl->phydev, wol);
1113
1114         return ret;
1115 }
1116 EXPORT_SYMBOL_GPL(phylink_ethtool_set_wol);
1117
1118 static void phylink_merge_link_mode(unsigned long *dst, const unsigned long *b)
1119 {
1120         __ETHTOOL_DECLARE_LINK_MODE_MASK(mask);
1121
1122         linkmode_zero(mask);
1123         phylink_set_port_modes(mask);
1124
1125         linkmode_and(dst, dst, mask);
1126         linkmode_or(dst, dst, b);
1127 }
1128
1129 static void phylink_get_ksettings(const struct phylink_link_state *state,
1130                                   struct ethtool_link_ksettings *kset)
1131 {
1132         phylink_merge_link_mode(kset->link_modes.advertising, state->advertising);
1133         linkmode_copy(kset->link_modes.lp_advertising, state->lp_advertising);
1134         kset->base.speed = state->speed;
1135         kset->base.duplex = state->duplex;
1136         kset->base.autoneg = state->an_enabled ? AUTONEG_ENABLE :
1137                                 AUTONEG_DISABLE;
1138 }
1139
1140 /**
1141  * phylink_ethtool_ksettings_get() - get the current link settings
1142  * @pl: a pointer to a &struct phylink returned from phylink_create()
1143  * @kset: a pointer to a &struct ethtool_link_ksettings to hold link settings
1144  *
1145  * Read the current link settings for the phylink instance specified by @pl.
1146  * This will be the link settings read from the MAC, PHY or fixed link
1147  * settings depending on the current negotiation mode.
1148  */
1149 int phylink_ethtool_ksettings_get(struct phylink *pl,
1150                                   struct ethtool_link_ksettings *kset)
1151 {
1152         struct phylink_link_state link_state;
1153
1154         ASSERT_RTNL();
1155
1156         if (pl->phydev) {
1157                 phy_ethtool_ksettings_get(pl->phydev, kset);
1158         } else {
1159                 kset->base.port = pl->link_port;
1160         }
1161
1162         linkmode_copy(kset->link_modes.supported, pl->supported);
1163
1164         switch (pl->cur_link_an_mode) {
1165         case MLO_AN_FIXED:
1166                 /* We are using fixed settings. Report these as the
1167                  * current link settings - and note that these also
1168                  * represent the supported speeds/duplex/pause modes.
1169                  */
1170                 phylink_get_fixed_state(pl, &link_state);
1171                 phylink_get_ksettings(&link_state, kset);
1172                 break;
1173
1174         case MLO_AN_INBAND:
1175                 /* If there is a phy attached, then use the reported
1176                  * settings from the phy with no modification.
1177                  */
1178                 if (pl->phydev)
1179                         break;
1180
1181                 phylink_mac_pcs_get_state(pl, &link_state);
1182
1183                 /* The MAC is reporting the link results from its own PCS
1184                  * layer via in-band status. Report these as the current
1185                  * link settings.
1186                  */
1187                 phylink_get_ksettings(&link_state, kset);
1188                 break;
1189         }
1190
1191         return 0;
1192 }
1193 EXPORT_SYMBOL_GPL(phylink_ethtool_ksettings_get);
1194
1195 /**
1196  * phylink_ethtool_ksettings_set() - set the link settings
1197  * @pl: a pointer to a &struct phylink returned from phylink_create()
1198  * @kset: a pointer to a &struct ethtool_link_ksettings for the desired modes
1199  */
1200 int phylink_ethtool_ksettings_set(struct phylink *pl,
1201                                   const struct ethtool_link_ksettings *kset)
1202 {
1203         __ETHTOOL_DECLARE_LINK_MODE_MASK(support);
1204         struct ethtool_link_ksettings our_kset;
1205         struct phylink_link_state config;
1206         int ret;
1207
1208         ASSERT_RTNL();
1209
1210         if (kset->base.autoneg != AUTONEG_DISABLE &&
1211             kset->base.autoneg != AUTONEG_ENABLE)
1212                 return -EINVAL;
1213
1214         linkmode_copy(support, pl->supported);
1215         config = pl->link_config;
1216
1217         /* Mask out unsupported advertisements */
1218         linkmode_and(config.advertising, kset->link_modes.advertising,
1219                      support);
1220
1221         /* FIXME: should we reject autoneg if phy/mac does not support it? */
1222         if (kset->base.autoneg == AUTONEG_DISABLE) {
1223                 const struct phy_setting *s;
1224
1225                 /* Autonegotiation disabled, select a suitable speed and
1226                  * duplex.
1227                  */
1228                 s = phy_lookup_setting(kset->base.speed, kset->base.duplex,
1229                                        support, false);
1230                 if (!s)
1231                         return -EINVAL;
1232
1233                 /* If we have a fixed link (as specified by firmware), refuse
1234                  * to change link parameters.
1235                  */
1236                 if (pl->cur_link_an_mode == MLO_AN_FIXED &&
1237                     (s->speed != pl->link_config.speed ||
1238                      s->duplex != pl->link_config.duplex))
1239                         return -EINVAL;
1240
1241                 config.speed = s->speed;
1242                 config.duplex = s->duplex;
1243                 config.an_enabled = false;
1244
1245                 __clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, config.advertising);
1246         } else {
1247                 /* If we have a fixed link, refuse to enable autonegotiation */
1248                 if (pl->cur_link_an_mode == MLO_AN_FIXED)
1249                         return -EINVAL;
1250
1251                 config.speed = SPEED_UNKNOWN;
1252                 config.duplex = DUPLEX_UNKNOWN;
1253                 config.an_enabled = true;
1254
1255                 __set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, config.advertising);
1256         }
1257
1258         if (pl->phydev) {
1259                 /* If we have a PHY, we process the kset change via phylib.
1260                  * phylib will call our link state function if the PHY
1261                  * parameters have changed, which will trigger a resolve
1262                  * and update the MAC configuration.
1263                  */
1264                 our_kset = *kset;
1265                 linkmode_copy(our_kset.link_modes.advertising,
1266                               config.advertising);
1267                 our_kset.base.speed = config.speed;
1268                 our_kset.base.duplex = config.duplex;
1269
1270                 ret = phy_ethtool_ksettings_set(pl->phydev, &our_kset);
1271                 if (ret)
1272                         return ret;
1273
1274                 mutex_lock(&pl->state_mutex);
1275                 /* Save the new configuration */
1276                 linkmode_copy(pl->link_config.advertising,
1277                               our_kset.link_modes.advertising);
1278                 pl->link_config.interface = config.interface;
1279                 pl->link_config.speed = our_kset.base.speed;
1280                 pl->link_config.duplex = our_kset.base.duplex;
1281                 pl->link_config.an_enabled = our_kset.base.autoneg !=
1282                                              AUTONEG_DISABLE;
1283                 mutex_unlock(&pl->state_mutex);
1284         } else {
1285                 /* For a fixed link, this isn't able to change any parameters,
1286                  * which just leaves inband mode.
1287                  */
1288                 if (phylink_validate(pl, support, &config))
1289                         return -EINVAL;
1290
1291                 /* If autonegotiation is enabled, we must have an advertisement */
1292                 if (config.an_enabled &&
1293                     phylink_is_empty_linkmode(config.advertising))
1294                         return -EINVAL;
1295
1296                 mutex_lock(&pl->state_mutex);
1297                 linkmode_copy(pl->link_config.advertising, config.advertising);
1298                 pl->link_config.interface = config.interface;
1299                 pl->link_config.speed = config.speed;
1300                 pl->link_config.duplex = config.duplex;
1301                 pl->link_config.an_enabled = kset->base.autoneg !=
1302                                              AUTONEG_DISABLE;
1303
1304                 if (pl->cur_link_an_mode == MLO_AN_INBAND &&
1305                     !test_bit(PHYLINK_DISABLE_STOPPED,
1306                               &pl->phylink_disable_state)) {
1307                         /* If in 802.3z mode, this updates the advertisement.
1308                          *
1309                          * If we are in SGMII mode without a PHY, there is no
1310                          * advertisement; the only thing we have is the pause
1311                          * modes which can only come from a PHY.
1312                          */
1313                         phylink_mac_config(pl, &pl->link_config);
1314                         phylink_mac_an_restart(pl);
1315                 }
1316                 mutex_unlock(&pl->state_mutex);
1317         }
1318
1319         return 0;
1320 }
1321 EXPORT_SYMBOL_GPL(phylink_ethtool_ksettings_set);
1322
1323 /**
1324  * phylink_ethtool_nway_reset() - restart negotiation
1325  * @pl: a pointer to a &struct phylink returned from phylink_create()
1326  *
1327  * Restart negotiation for the phylink instance specified by @pl. This will
1328  * cause any attached phy to restart negotiation with the link partner, and
1329  * if the MAC is in a BaseX mode, the MAC will also be requested to restart
1330  * negotiation.
1331  *
1332  * Returns zero on success, or negative error code.
1333  */
1334 int phylink_ethtool_nway_reset(struct phylink *pl)
1335 {
1336         int ret = 0;
1337
1338         ASSERT_RTNL();
1339
1340         if (pl->phydev)
1341                 ret = phy_restart_aneg(pl->phydev);
1342         phylink_mac_an_restart(pl);
1343
1344         return ret;
1345 }
1346 EXPORT_SYMBOL_GPL(phylink_ethtool_nway_reset);
1347
1348 /**
1349  * phylink_ethtool_get_pauseparam() - get the current pause parameters
1350  * @pl: a pointer to a &struct phylink returned from phylink_create()
1351  * @pause: a pointer to a &struct ethtool_pauseparam
1352  */
1353 void phylink_ethtool_get_pauseparam(struct phylink *pl,
1354                                     struct ethtool_pauseparam *pause)
1355 {
1356         ASSERT_RTNL();
1357
1358         pause->autoneg = !!(pl->link_config.pause & MLO_PAUSE_AN);
1359         pause->rx_pause = !!(pl->link_config.pause & MLO_PAUSE_RX);
1360         pause->tx_pause = !!(pl->link_config.pause & MLO_PAUSE_TX);
1361 }
1362 EXPORT_SYMBOL_GPL(phylink_ethtool_get_pauseparam);
1363
1364 /**
1365  * phylink_ethtool_set_pauseparam() - set the current pause parameters
1366  * @pl: a pointer to a &struct phylink returned from phylink_create()
1367  * @pause: a pointer to a &struct ethtool_pauseparam
1368  */
1369 int phylink_ethtool_set_pauseparam(struct phylink *pl,
1370                                    struct ethtool_pauseparam *pause)
1371 {
1372         struct phylink_link_state *config = &pl->link_config;
1373
1374         ASSERT_RTNL();
1375
1376         if (!phylink_test(pl->supported, Pause) &&
1377             !phylink_test(pl->supported, Asym_Pause))
1378                 return -EOPNOTSUPP;
1379
1380         if (!phylink_test(pl->supported, Asym_Pause) &&
1381             !pause->autoneg && pause->rx_pause != pause->tx_pause)
1382                 return -EINVAL;
1383
1384         config->pause &= ~(MLO_PAUSE_AN | MLO_PAUSE_TXRX_MASK);
1385
1386         if (pause->autoneg)
1387                 config->pause |= MLO_PAUSE_AN;
1388         if (pause->rx_pause)
1389                 config->pause |= MLO_PAUSE_RX;
1390         if (pause->tx_pause)
1391                 config->pause |= MLO_PAUSE_TX;
1392
1393         /* If we have a PHY, phylib will call our link state function if the
1394          * mode has changed, which will trigger a resolve and update the MAC
1395          * configuration.
1396          */
1397         if (pl->phydev) {
1398                 phy_set_asym_pause(pl->phydev, pause->rx_pause,
1399                                    pause->tx_pause);
1400         } else if (!test_bit(PHYLINK_DISABLE_STOPPED,
1401                              &pl->phylink_disable_state)) {
1402                 switch (pl->cur_link_an_mode) {
1403                 case MLO_AN_FIXED:
1404                         /* Should we allow fixed links to change against the config? */
1405                         phylink_resolve_flow(pl, config);
1406                         phylink_mac_config(pl, config);
1407                         break;
1408
1409                 case MLO_AN_INBAND:
1410                         phylink_mac_config(pl, config);
1411                         phylink_mac_an_restart(pl);
1412                         break;
1413                 }
1414         }
1415
1416         return 0;
1417 }
1418 EXPORT_SYMBOL_GPL(phylink_ethtool_set_pauseparam);
1419
1420 /**
1421  * phylink_ethtool_get_eee_err() - read the energy efficient ethernet error
1422  *   counter
1423  * @pl: a pointer to a &struct phylink returned from phylink_create().
1424  *
1425  * Read the Energy Efficient Ethernet error counter from the PHY associated
1426  * with the phylink instance specified by @pl.
1427  *
1428  * Returns positive error counter value, or negative error code.
1429  */
1430 int phylink_get_eee_err(struct phylink *pl)
1431 {
1432         int ret = 0;
1433
1434         ASSERT_RTNL();
1435
1436         if (pl->phydev)
1437                 ret = phy_get_eee_err(pl->phydev);
1438
1439         return ret;
1440 }
1441 EXPORT_SYMBOL_GPL(phylink_get_eee_err);
1442
1443 /**
1444  * phylink_init_eee() - init and check the EEE features
1445  * @pl: a pointer to a &struct phylink returned from phylink_create()
1446  * @clk_stop_enable: allow PHY to stop receive clock
1447  *
1448  * Must be called either with RTNL held or within mac_link_up()
1449  */
1450 int phylink_init_eee(struct phylink *pl, bool clk_stop_enable)
1451 {
1452         int ret = -EOPNOTSUPP;
1453
1454         if (pl->phydev)
1455                 ret = phy_init_eee(pl->phydev, clk_stop_enable);
1456
1457         return ret;
1458 }
1459 EXPORT_SYMBOL_GPL(phylink_init_eee);
1460
1461 /**
1462  * phylink_ethtool_get_eee() - read the energy efficient ethernet parameters
1463  * @pl: a pointer to a &struct phylink returned from phylink_create()
1464  * @eee: a pointer to a &struct ethtool_eee for the read parameters
1465  */
1466 int phylink_ethtool_get_eee(struct phylink *pl, struct ethtool_eee *eee)
1467 {
1468         int ret = -EOPNOTSUPP;
1469
1470         ASSERT_RTNL();
1471
1472         if (pl->phydev)
1473                 ret = phy_ethtool_get_eee(pl->phydev, eee);
1474
1475         return ret;
1476 }
1477 EXPORT_SYMBOL_GPL(phylink_ethtool_get_eee);
1478
1479 /**
1480  * phylink_ethtool_set_eee() - set the energy efficient ethernet parameters
1481  * @pl: a pointer to a &struct phylink returned from phylink_create()
1482  * @eee: a pointer to a &struct ethtool_eee for the desired parameters
1483  */
1484 int phylink_ethtool_set_eee(struct phylink *pl, struct ethtool_eee *eee)
1485 {
1486         int ret = -EOPNOTSUPP;
1487
1488         ASSERT_RTNL();
1489
1490         if (pl->phydev)
1491                 ret = phy_ethtool_set_eee(pl->phydev, eee);
1492
1493         return ret;
1494 }
1495 EXPORT_SYMBOL_GPL(phylink_ethtool_set_eee);
1496
1497 /* This emulates MII registers for a fixed-mode phy operating as per the
1498  * passed in state. "aneg" defines if we report negotiation is possible.
1499  *
1500  * FIXME: should deal with negotiation state too.
1501  */
1502 static int phylink_mii_emul_read(unsigned int reg,
1503                                  struct phylink_link_state *state)
1504 {
1505         struct fixed_phy_status fs;
1506         int val;
1507
1508         fs.link = state->link;
1509         fs.speed = state->speed;
1510         fs.duplex = state->duplex;
1511         fs.pause = state->pause & MLO_PAUSE_SYM;
1512         fs.asym_pause = state->pause & MLO_PAUSE_ASYM;
1513
1514         val = swphy_read_reg(reg, &fs);
1515         if (reg == MII_BMSR) {
1516                 if (!state->an_complete)
1517                         val &= ~BMSR_ANEGCOMPLETE;
1518         }
1519         return val;
1520 }
1521
1522 static int phylink_phy_read(struct phylink *pl, unsigned int phy_id,
1523                             unsigned int reg)
1524 {
1525         struct phy_device *phydev = pl->phydev;
1526         int prtad, devad;
1527
1528         if (mdio_phy_id_is_c45(phy_id)) {
1529                 prtad = mdio_phy_id_prtad(phy_id);
1530                 devad = mdio_phy_id_devad(phy_id);
1531                 devad = MII_ADDR_C45 | devad << 16 | reg;
1532         } else if (phydev->is_c45) {
1533                 switch (reg) {
1534                 case MII_BMCR:
1535                 case MII_BMSR:
1536                 case MII_PHYSID1:
1537                 case MII_PHYSID2:
1538                         devad = __ffs(phydev->c45_ids.devices_in_package);
1539                         break;
1540                 case MII_ADVERTISE:
1541                 case MII_LPA:
1542                         if (!(phydev->c45_ids.devices_in_package & MDIO_DEVS_AN))
1543                                 return -EINVAL;
1544                         devad = MDIO_MMD_AN;
1545                         if (reg == MII_ADVERTISE)
1546                                 reg = MDIO_AN_ADVERTISE;
1547                         else
1548                                 reg = MDIO_AN_LPA;
1549                         break;
1550                 default:
1551                         return -EINVAL;
1552                 }
1553                 prtad = phy_id;
1554                 devad = MII_ADDR_C45 | devad << 16 | reg;
1555         } else {
1556                 prtad = phy_id;
1557                 devad = reg;
1558         }
1559         return mdiobus_read(pl->phydev->mdio.bus, prtad, devad);
1560 }
1561
1562 static int phylink_phy_write(struct phylink *pl, unsigned int phy_id,
1563                              unsigned int reg, unsigned int val)
1564 {
1565         struct phy_device *phydev = pl->phydev;
1566         int prtad, devad;
1567
1568         if (mdio_phy_id_is_c45(phy_id)) {
1569                 prtad = mdio_phy_id_prtad(phy_id);
1570                 devad = mdio_phy_id_devad(phy_id);
1571                 devad = MII_ADDR_C45 | devad << 16 | reg;
1572         } else if (phydev->is_c45) {
1573                 switch (reg) {
1574                 case MII_BMCR:
1575                 case MII_BMSR:
1576                 case MII_PHYSID1:
1577                 case MII_PHYSID2:
1578                         devad = __ffs(phydev->c45_ids.devices_in_package);
1579                         break;
1580                 case MII_ADVERTISE:
1581                 case MII_LPA:
1582                         if (!(phydev->c45_ids.devices_in_package & MDIO_DEVS_AN))
1583                                 return -EINVAL;
1584                         devad = MDIO_MMD_AN;
1585                         if (reg == MII_ADVERTISE)
1586                                 reg = MDIO_AN_ADVERTISE;
1587                         else
1588                                 reg = MDIO_AN_LPA;
1589                         break;
1590                 default:
1591                         return -EINVAL;
1592                 }
1593                 prtad = phy_id;
1594                 devad = MII_ADDR_C45 | devad << 16 | reg;
1595         } else {
1596                 prtad = phy_id;
1597                 devad = reg;
1598         }
1599
1600         return mdiobus_write(phydev->mdio.bus, prtad, devad, val);
1601 }
1602
1603 static int phylink_mii_read(struct phylink *pl, unsigned int phy_id,
1604                             unsigned int reg)
1605 {
1606         struct phylink_link_state state;
1607         int val = 0xffff;
1608
1609         switch (pl->cur_link_an_mode) {
1610         case MLO_AN_FIXED:
1611                 if (phy_id == 0) {
1612                         phylink_get_fixed_state(pl, &state);
1613                         val = phylink_mii_emul_read(reg, &state);
1614                 }
1615                 break;
1616
1617         case MLO_AN_PHY:
1618                 return -EOPNOTSUPP;
1619
1620         case MLO_AN_INBAND:
1621                 if (phy_id == 0) {
1622                         phylink_mac_pcs_get_state(pl, &state);
1623                         val = phylink_mii_emul_read(reg, &state);
1624                 }
1625                 break;
1626         }
1627
1628         return val & 0xffff;
1629 }
1630
1631 static int phylink_mii_write(struct phylink *pl, unsigned int phy_id,
1632                              unsigned int reg, unsigned int val)
1633 {
1634         switch (pl->cur_link_an_mode) {
1635         case MLO_AN_FIXED:
1636                 break;
1637
1638         case MLO_AN_PHY:
1639                 return -EOPNOTSUPP;
1640
1641         case MLO_AN_INBAND:
1642                 break;
1643         }
1644
1645         return 0;
1646 }
1647
1648 /**
1649  * phylink_mii_ioctl() - generic mii ioctl interface
1650  * @pl: a pointer to a &struct phylink returned from phylink_create()
1651  * @ifr: a pointer to a &struct ifreq for socket ioctls
1652  * @cmd: ioctl cmd to execute
1653  *
1654  * Perform the specified MII ioctl on the PHY attached to the phylink instance
1655  * specified by @pl. If no PHY is attached, emulate the presence of the PHY.
1656  *
1657  * Returns: zero on success or negative error code.
1658  *
1659  * %SIOCGMIIPHY:
1660  *  read register from the current PHY.
1661  * %SIOCGMIIREG:
1662  *  read register from the specified PHY.
1663  * %SIOCSMIIREG:
1664  *  set a register on the specified PHY.
1665  */
1666 int phylink_mii_ioctl(struct phylink *pl, struct ifreq *ifr, int cmd)
1667 {
1668         struct mii_ioctl_data *mii = if_mii(ifr);
1669         int  ret;
1670
1671         ASSERT_RTNL();
1672
1673         if (pl->phydev) {
1674                 /* PHYs only exist for MLO_AN_PHY and SGMII */
1675                 switch (cmd) {
1676                 case SIOCGMIIPHY:
1677                         mii->phy_id = pl->phydev->mdio.addr;
1678                         /* fall through */
1679
1680                 case SIOCGMIIREG:
1681                         ret = phylink_phy_read(pl, mii->phy_id, mii->reg_num);
1682                         if (ret >= 0) {
1683                                 mii->val_out = ret;
1684                                 ret = 0;
1685                         }
1686                         break;
1687
1688                 case SIOCSMIIREG:
1689                         ret = phylink_phy_write(pl, mii->phy_id, mii->reg_num,
1690                                                 mii->val_in);
1691                         break;
1692
1693                 default:
1694                         ret = phy_mii_ioctl(pl->phydev, ifr, cmd);
1695                         break;
1696                 }
1697         } else {
1698                 switch (cmd) {
1699                 case SIOCGMIIPHY:
1700                         mii->phy_id = 0;
1701                         /* fall through */
1702
1703                 case SIOCGMIIREG:
1704                         ret = phylink_mii_read(pl, mii->phy_id, mii->reg_num);
1705                         if (ret >= 0) {
1706                                 mii->val_out = ret;
1707                                 ret = 0;
1708                         }
1709                         break;
1710
1711                 case SIOCSMIIREG:
1712                         ret = phylink_mii_write(pl, mii->phy_id, mii->reg_num,
1713                                                 mii->val_in);
1714                         break;
1715
1716                 default:
1717                         ret = -EOPNOTSUPP;
1718                         break;
1719                 }
1720         }
1721
1722         return ret;
1723 }
1724 EXPORT_SYMBOL_GPL(phylink_mii_ioctl);
1725
1726 static void phylink_sfp_attach(void *upstream, struct sfp_bus *bus)
1727 {
1728         struct phylink *pl = upstream;
1729
1730         pl->netdev->sfp_bus = bus;
1731 }
1732
1733 static void phylink_sfp_detach(void *upstream, struct sfp_bus *bus)
1734 {
1735         struct phylink *pl = upstream;
1736
1737         pl->netdev->sfp_bus = NULL;
1738 }
1739
1740 static int phylink_sfp_config(struct phylink *pl, u8 mode,
1741                               const unsigned long *supported,
1742                               const unsigned long *advertising)
1743 {
1744         __ETHTOOL_DECLARE_LINK_MODE_MASK(support1);
1745         __ETHTOOL_DECLARE_LINK_MODE_MASK(support);
1746         struct phylink_link_state config;
1747         phy_interface_t iface;
1748         bool changed;
1749         int ret;
1750
1751         linkmode_copy(support, supported);
1752
1753         memset(&config, 0, sizeof(config));
1754         linkmode_copy(config.advertising, advertising);
1755         config.interface = PHY_INTERFACE_MODE_NA;
1756         config.speed = SPEED_UNKNOWN;
1757         config.duplex = DUPLEX_UNKNOWN;
1758         config.pause = MLO_PAUSE_AN;
1759         config.an_enabled = pl->link_config.an_enabled;
1760
1761         /* Ignore errors if we're expecting a PHY to attach later */
1762         ret = phylink_validate(pl, support, &config);
1763         if (ret) {
1764                 phylink_err(pl, "validation with support %*pb failed: %d\n",
1765                             __ETHTOOL_LINK_MODE_MASK_NBITS, support, ret);
1766                 return ret;
1767         }
1768
1769         iface = sfp_select_interface(pl->sfp_bus, config.advertising);
1770         if (iface == PHY_INTERFACE_MODE_NA) {
1771                 phylink_err(pl,
1772                             "selection of interface failed, advertisement %*pb\n",
1773                             __ETHTOOL_LINK_MODE_MASK_NBITS, config.advertising);
1774                 return -EINVAL;
1775         }
1776
1777         config.interface = iface;
1778         linkmode_copy(support1, support);
1779         ret = phylink_validate(pl, support1, &config);
1780         if (ret) {
1781                 phylink_err(pl, "validation of %s/%s with support %*pb failed: %d\n",
1782                             phylink_an_mode_str(mode),
1783                             phy_modes(config.interface),
1784                             __ETHTOOL_LINK_MODE_MASK_NBITS, support, ret);
1785                 return ret;
1786         }
1787
1788         phylink_dbg(pl, "requesting link mode %s/%s with support %*pb\n",
1789                     phylink_an_mode_str(mode), phy_modes(config.interface),
1790                     __ETHTOOL_LINK_MODE_MASK_NBITS, support);
1791
1792         if (phy_interface_mode_is_8023z(iface) && pl->phydev)
1793                 return -EINVAL;
1794
1795         changed = !linkmode_equal(pl->supported, support);
1796         if (changed) {
1797                 linkmode_copy(pl->supported, support);
1798                 linkmode_copy(pl->link_config.advertising, config.advertising);
1799         }
1800
1801         if (pl->cur_link_an_mode != mode ||
1802             pl->link_config.interface != config.interface) {
1803                 pl->link_config.interface = config.interface;
1804                 pl->cur_link_an_mode = mode;
1805
1806                 changed = true;
1807
1808                 phylink_info(pl, "switched to %s/%s link mode\n",
1809                              phylink_an_mode_str(mode),
1810                              phy_modes(config.interface));
1811         }
1812
1813         pl->link_port = pl->sfp_port;
1814
1815         if (changed && !test_bit(PHYLINK_DISABLE_STOPPED,
1816                                  &pl->phylink_disable_state))
1817                 phylink_mac_config(pl, &pl->link_config);
1818
1819         return ret;
1820 }
1821
1822 static int phylink_sfp_module_insert(void *upstream,
1823                                      const struct sfp_eeprom_id *id)
1824 {
1825         struct phylink *pl = upstream;
1826         unsigned long *support = pl->sfp_support;
1827
1828         ASSERT_RTNL();
1829
1830         linkmode_zero(support);
1831         sfp_parse_support(pl->sfp_bus, id, support);
1832         pl->sfp_port = sfp_parse_port(pl->sfp_bus, id, support);
1833
1834         /* If this module may have a PHY connecting later, defer until later */
1835         pl->sfp_may_have_phy = sfp_may_have_phy(pl->sfp_bus, id);
1836         if (pl->sfp_may_have_phy)
1837                 return 0;
1838
1839         return phylink_sfp_config(pl, MLO_AN_INBAND, support, support);
1840 }
1841
1842 static int phylink_sfp_module_start(void *upstream)
1843 {
1844         struct phylink *pl = upstream;
1845
1846         /* If this SFP module has a PHY, start the PHY now. */
1847         if (pl->phydev) {
1848                 phy_start(pl->phydev);
1849                 return 0;
1850         }
1851
1852         /* If the module may have a PHY but we didn't detect one we
1853          * need to configure the MAC here.
1854          */
1855         if (!pl->sfp_may_have_phy)
1856                 return 0;
1857
1858         return phylink_sfp_config(pl, MLO_AN_INBAND,
1859                                   pl->sfp_support, pl->sfp_support);
1860 }
1861
1862 static void phylink_sfp_module_stop(void *upstream)
1863 {
1864         struct phylink *pl = upstream;
1865
1866         /* If this SFP module has a PHY, stop it. */
1867         if (pl->phydev)
1868                 phy_stop(pl->phydev);
1869 }
1870
1871 static void phylink_sfp_link_down(void *upstream)
1872 {
1873         struct phylink *pl = upstream;
1874
1875         ASSERT_RTNL();
1876
1877         phylink_run_resolve_and_disable(pl, PHYLINK_DISABLE_LINK);
1878 }
1879
1880 static void phylink_sfp_link_up(void *upstream)
1881 {
1882         struct phylink *pl = upstream;
1883
1884         ASSERT_RTNL();
1885
1886         clear_bit(PHYLINK_DISABLE_LINK, &pl->phylink_disable_state);
1887         phylink_run_resolve(pl);
1888 }
1889
1890 /* The Broadcom BCM84881 in the Methode DM7052 is unable to provide a SGMII
1891  * or 802.3z control word, so inband will not work.
1892  */
1893 static bool phylink_phy_no_inband(struct phy_device *phy)
1894 {
1895         return phy->is_c45 &&
1896                 (phy->c45_ids.device_ids[1] & 0xfffffff0) == 0xae025150;
1897 }
1898
1899 static int phylink_sfp_connect_phy(void *upstream, struct phy_device *phy)
1900 {
1901         struct phylink *pl = upstream;
1902         phy_interface_t interface;
1903         u8 mode;
1904         int ret;
1905
1906         /*
1907          * This is the new way of dealing with flow control for PHYs,
1908          * as described by Timur Tabi in commit 529ed1275263 ("net: phy:
1909          * phy drivers should not set SUPPORTED_[Asym_]Pause") except
1910          * using our validate call to the MAC, we rely upon the MAC
1911          * clearing the bits from both supported and advertising fields.
1912          */
1913         phy_support_asym_pause(phy);
1914
1915         if (phylink_phy_no_inband(phy))
1916                 mode = MLO_AN_PHY;
1917         else
1918                 mode = MLO_AN_INBAND;
1919
1920         /* Do the initial configuration */
1921         ret = phylink_sfp_config(pl, mode, phy->supported, phy->advertising);
1922         if (ret < 0)
1923                 return ret;
1924
1925         interface = pl->link_config.interface;
1926         ret = phylink_attach_phy(pl, phy, interface);
1927         if (ret < 0)
1928                 return ret;
1929
1930         ret = phylink_bringup_phy(pl, phy, interface);
1931         if (ret)
1932                 phy_detach(phy);
1933
1934         return ret;
1935 }
1936
1937 static void phylink_sfp_disconnect_phy(void *upstream)
1938 {
1939         phylink_disconnect_phy(upstream);
1940 }
1941
1942 static const struct sfp_upstream_ops sfp_phylink_ops = {
1943         .attach = phylink_sfp_attach,
1944         .detach = phylink_sfp_detach,
1945         .module_insert = phylink_sfp_module_insert,
1946         .module_start = phylink_sfp_module_start,
1947         .module_stop = phylink_sfp_module_stop,
1948         .link_up = phylink_sfp_link_up,
1949         .link_down = phylink_sfp_link_down,
1950         .connect_phy = phylink_sfp_connect_phy,
1951         .disconnect_phy = phylink_sfp_disconnect_phy,
1952 };
1953
1954 /* Helpers for MAC drivers */
1955
1956 /**
1957  * phylink_helper_basex_speed() - 1000BaseX/2500BaseX helper
1958  * @state: a pointer to a &struct phylink_link_state
1959  *
1960  * Inspect the interface mode, advertising mask or forced speed and
1961  * decide whether to run at 2.5Gbit or 1Gbit appropriately, switching
1962  * the interface mode to suit.  @state->interface is appropriately
1963  * updated, and the advertising mask has the "other" baseX_Full flag
1964  * cleared.
1965  */
1966 void phylink_helper_basex_speed(struct phylink_link_state *state)
1967 {
1968         if (phy_interface_mode_is_8023z(state->interface)) {
1969                 bool want_2500 = state->an_enabled ?
1970                         phylink_test(state->advertising, 2500baseX_Full) :
1971                         state->speed == SPEED_2500;
1972
1973                 if (want_2500) {
1974                         phylink_clear(state->advertising, 1000baseX_Full);
1975                         state->interface = PHY_INTERFACE_MODE_2500BASEX;
1976                 } else {
1977                         phylink_clear(state->advertising, 2500baseX_Full);
1978                         state->interface = PHY_INTERFACE_MODE_1000BASEX;
1979                 }
1980         }
1981 }
1982 EXPORT_SYMBOL_GPL(phylink_helper_basex_speed);
1983
1984 MODULE_LICENSE("GPL v2");