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/acpi.h>
   9 #include <linux/ethtool.h>
  10 #include <linux/export.h>
  11 #include <linux/gpio/consumer.h>
  12 #include <linux/netdevice.h>
  13 #include <linux/of.h>
  14 #include <linux/of_mdio.h>
  15 #include <linux/phy.h>
  16 #include <linux/phy_fixed.h>
  17 #include <linux/phylink.h>
  18 #include <linux/rtnetlink.h>
  19 #include <linux/spinlock.h>
  20 #include <linux/timer.h>
  21 #include <linux/workqueue.h>
  22
  23 #include "sfp.h"
  24 #include "swphy.h"
  25
  26 #define SUPPORTED_INTERFACES \
  27         (SUPPORTED_TP | SUPPORTED_MII | SUPPORTED_FIBRE | \
  28          SUPPORTED_BNC | SUPPORTED_AUI | SUPPORTED_Backplane)
  29 #define ADVERTISED_INTERFACES \
  30         (ADVERTISED_TP | ADVERTISED_MII | ADVERTISED_FIBRE | \
  31          ADVERTISED_BNC | ADVERTISED_AUI | ADVERTISED_Backplane)
  32
  33 enum {
  34         PHYLINK_DISABLE_STOPPED,
  35         PHYLINK_DISABLE_LINK,
  36         PHYLINK_DISABLE_MAC_WOL,
  37 };
  38
  39 /**
  40  * struct phylink - internal data type for phylink
  41  */
  42 struct phylink {
  43         /* private: */
  44         struct net_device *netdev;
  45         const struct phylink_mac_ops *mac_ops;
  46         const struct phylink_pcs_ops *pcs_ops;
  47         struct phylink_config *config;
  48         struct phylink_pcs *pcs;
  49         struct device *dev;
  50         unsigned int old_link_state:1;
  51
  52         unsigned long phylink_disable_state; /* bitmask of disables */
  53         struct phy_device *phydev;
  54         phy_interface_t link_interface; /* PHY_INTERFACE_xxx */
  55         u8 cfg_link_an_mode;            /* MLO_AN_xxx */
  56         u8 cur_link_an_mode;
  57         u8 link_port;                   /* The current non-phy ethtool port */
  58         __ETHTOOL_DECLARE_LINK_MODE_MASK(supported);
  59
  60         /* The link configuration settings */
  61         struct phylink_link_state link_config;
  62
  63         /* The current settings */
  64         phy_interface_t cur_interface;
  65
  66         struct gpio_desc *link_gpio;
  67         unsigned int link_irq;
  68         struct timer_list link_poll;
  69         void (*get_fixed_state)(struct net_device *dev,
  70                                 struct phylink_link_state *s);
  71
  72         struct mutex state_mutex;
  73         struct phylink_link_state phy_state;
  74         struct work_struct resolve;
  75
  76         bool mac_link_dropped;
  77         bool using_mac_select_pcs;
  78
  79         struct sfp_bus *sfp_bus;
  80         bool sfp_may_have_phy;
  81         __ETHTOOL_DECLARE_LINK_MODE_MASK(sfp_support);
  82         u8 sfp_port;
  83 };
  84
  85 #define phylink_printk(level, pl, fmt, ...) \
  86         do { \
  87                 if ((pl)->config->type == PHYLINK_NETDEV) \
  88                         netdev_printk(level, (pl)->netdev, fmt, ##__VA_ARGS__); \
  89                 else if ((pl)->config->type == PHYLINK_DEV) \
  90                         dev_printk(level, (pl)->dev, fmt, ##__VA_ARGS__); \
  91         } while (0)
  92
  93 #define phylink_err(pl, fmt, ...) \
  94         phylink_printk(KERN_ERR, pl, fmt, ##__VA_ARGS__)
  95 #define phylink_warn(pl, fmt, ...) \
  96         phylink_printk(KERN_WARNING, pl, fmt, ##__VA_ARGS__)
  97 #define phylink_info(pl, fmt, ...) \
  98         phylink_printk(KERN_INFO, pl, fmt, ##__VA_ARGS__)
  99 #if defined(CONFIG_DYNAMIC_DEBUG)
 100 #define phylink_dbg(pl, fmt, ...) \
 101 do {                                                                    \
 102         if ((pl)->config->type == PHYLINK_NETDEV)                       \
 103                 netdev_dbg((pl)->netdev, fmt, ##__VA_ARGS__);           \
 104         else if ((pl)->config->type == PHYLINK_DEV)                     \
 105                 dev_dbg((pl)->dev, fmt, ##__VA_ARGS__);                 \
 106 } while (0)
 107 #elif defined(DEBUG)
 108 #define phylink_dbg(pl, fmt, ...)                                       \
 109         phylink_printk(KERN_DEBUG, pl, fmt, ##__VA_ARGS__)
 110 #else
 111 #define phylink_dbg(pl, fmt, ...)                                       \
 112 ({                                                                      \
 113         if (0)                                                          \
 114                 phylink_printk(KERN_DEBUG, pl, fmt, ##__VA_ARGS__);     \
 115 })
 116 #endif
 117
 118 /**
 119  * phylink_set_port_modes() - set the port type modes in the ethtool mask
 120  * @mask: ethtool link mode mask
 121  *
 122  * Sets all the port type modes in the ethtool mask.  MAC drivers should
 123  * use this in their 'validate' callback.
 124  */
 125 void phylink_set_port_modes(unsigned long *mask)
 126 {
 127         phylink_set(mask, TP);
 128         phylink_set(mask, AUI);
 129         phylink_set(mask, MII);
 130         phylink_set(mask, FIBRE);
 131         phylink_set(mask, BNC);
 132         phylink_set(mask, Backplane);
 133 }
 134 EXPORT_SYMBOL_GPL(phylink_set_port_modes);
 135
 136 static int phylink_is_empty_linkmode(const unsigned long *linkmode)
 137 {
 138         __ETHTOOL_DECLARE_LINK_MODE_MASK(tmp) = { 0, };
 139
 140         phylink_set_port_modes(tmp);
 141         phylink_set(tmp, Autoneg);
 142         phylink_set(tmp, Pause);
 143         phylink_set(tmp, Asym_Pause);
 144
 145         return linkmode_subset(linkmode, tmp);
 146 }
 147
 148 static const char *phylink_an_mode_str(unsigned int mode)
 149 {
 150         static const char *modestr[] = {
 151                 [MLO_AN_PHY] = "phy",
 152                 [MLO_AN_FIXED] = "fixed",
 153                 [MLO_AN_INBAND] = "inband",
 154         };
 155
 156         return mode < ARRAY_SIZE(modestr) ? modestr[mode] : "unknown";
 157 }
 158
 159 static void phylink_caps_to_linkmodes(unsigned long *linkmodes,
 160                                       unsigned long caps)
 161 {
 162         if (caps & MAC_SYM_PAUSE)
 163                 __set_bit(ETHTOOL_LINK_MODE_Pause_BIT, linkmodes);
 164
 165         if (caps & MAC_ASYM_PAUSE)
 166                 __set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, linkmodes);
 167
 168         if (caps & MAC_10HD)
 169                 __set_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT, linkmodes);
 170
 171         if (caps & MAC_10FD) {
 172                 __set_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT, linkmodes);
 173                 __set_bit(ETHTOOL_LINK_MODE_10baseT1L_Full_BIT, linkmodes);
 174         }
 175
 176         if (caps & MAC_100HD) {
 177                 __set_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT, linkmodes);
 178                 __set_bit(ETHTOOL_LINK_MODE_100baseFX_Half_BIT, linkmodes);
 179         }
 180
 181         if (caps & MAC_100FD) {
 182                 __set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, linkmodes);
 183                 __set_bit(ETHTOOL_LINK_MODE_100baseT1_Full_BIT, linkmodes);
 184                 __set_bit(ETHTOOL_LINK_MODE_100baseFX_Full_BIT, linkmodes);
 185         }
 186
 187         if (caps & MAC_1000HD)
 188                 __set_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT, linkmodes);
 189
 190         if (caps & MAC_1000FD) {
 191                 __set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, linkmodes);
 192                 __set_bit(ETHTOOL_LINK_MODE_1000baseKX_Full_BIT, linkmodes);
 193                 __set_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT, linkmodes);
 194                 __set_bit(ETHTOOL_LINK_MODE_1000baseT1_Full_BIT, linkmodes);
 195         }
 196
 197         if (caps & MAC_2500FD) {
 198                 __set_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT, linkmodes);
 199                 __set_bit(ETHTOOL_LINK_MODE_2500baseX_Full_BIT, linkmodes);
 200         }
 201
 202         if (caps & MAC_5000FD)
 203                 __set_bit(ETHTOOL_LINK_MODE_5000baseT_Full_BIT, linkmodes);
 204
 205         if (caps & MAC_10000FD) {
 206                 __set_bit(ETHTOOL_LINK_MODE_10000baseT_Full_BIT, linkmodes);
 207                 __set_bit(ETHTOOL_LINK_MODE_10000baseKX4_Full_BIT, linkmodes);
 208                 __set_bit(ETHTOOL_LINK_MODE_10000baseKR_Full_BIT, linkmodes);
 209                 __set_bit(ETHTOOL_LINK_MODE_10000baseR_FEC_BIT, linkmodes);
 210                 __set_bit(ETHTOOL_LINK_MODE_10000baseCR_Full_BIT, linkmodes);
 211                 __set_bit(ETHTOOL_LINK_MODE_10000baseSR_Full_BIT, linkmodes);
 212                 __set_bit(ETHTOOL_LINK_MODE_10000baseLR_Full_BIT, linkmodes);
 213                 __set_bit(ETHTOOL_LINK_MODE_10000baseLRM_Full_BIT, linkmodes);
 214                 __set_bit(ETHTOOL_LINK_MODE_10000baseER_Full_BIT, linkmodes);
 215         }
 216
 217         if (caps & MAC_25000FD) {
 218                 __set_bit(ETHTOOL_LINK_MODE_25000baseCR_Full_BIT, linkmodes);
 219                 __set_bit(ETHTOOL_LINK_MODE_25000baseKR_Full_BIT, linkmodes);
 220                 __set_bit(ETHTOOL_LINK_MODE_25000baseSR_Full_BIT, linkmodes);
 221         }
 222
 223         if (caps & MAC_40000FD) {
 224                 __set_bit(ETHTOOL_LINK_MODE_40000baseKR4_Full_BIT, linkmodes);
 225                 __set_bit(ETHTOOL_LINK_MODE_40000baseCR4_Full_BIT, linkmodes);
 226                 __set_bit(ETHTOOL_LINK_MODE_40000baseSR4_Full_BIT, linkmodes);
 227                 __set_bit(ETHTOOL_LINK_MODE_40000baseLR4_Full_BIT, linkmodes);
 228         }
 229
 230         if (caps & MAC_50000FD) {
 231                 __set_bit(ETHTOOL_LINK_MODE_50000baseCR2_Full_BIT, linkmodes);
 232                 __set_bit(ETHTOOL_LINK_MODE_50000baseKR2_Full_BIT, linkmodes);
 233                 __set_bit(ETHTOOL_LINK_MODE_50000baseSR2_Full_BIT, linkmodes);
 234                 __set_bit(ETHTOOL_LINK_MODE_50000baseKR_Full_BIT, linkmodes);
 235                 __set_bit(ETHTOOL_LINK_MODE_50000baseSR_Full_BIT, linkmodes);
 236                 __set_bit(ETHTOOL_LINK_MODE_50000baseCR_Full_BIT, linkmodes);
 237                 __set_bit(ETHTOOL_LINK_MODE_50000baseLR_ER_FR_Full_BIT,
 238                           linkmodes);
 239                 __set_bit(ETHTOOL_LINK_MODE_50000baseDR_Full_BIT, linkmodes);
 240         }
 241
 242         if (caps & MAC_56000FD) {
 243                 __set_bit(ETHTOOL_LINK_MODE_56000baseKR4_Full_BIT, linkmodes);
 244                 __set_bit(ETHTOOL_LINK_MODE_56000baseCR4_Full_BIT, linkmodes);
 245                 __set_bit(ETHTOOL_LINK_MODE_56000baseSR4_Full_BIT, linkmodes);
 246                 __set_bit(ETHTOOL_LINK_MODE_56000baseLR4_Full_BIT, linkmodes);
 247         }
 248
 249         if (caps & MAC_100000FD) {
 250                 __set_bit(ETHTOOL_LINK_MODE_100000baseKR4_Full_BIT, linkmodes);
 251                 __set_bit(ETHTOOL_LINK_MODE_100000baseSR4_Full_BIT, linkmodes);
 252                 __set_bit(ETHTOOL_LINK_MODE_100000baseCR4_Full_BIT, linkmodes);
 253                 __set_bit(ETHTOOL_LINK_MODE_100000baseLR4_ER4_Full_BIT,
 254                           linkmodes);
 255                 __set_bit(ETHTOOL_LINK_MODE_100000baseKR2_Full_BIT, linkmodes);
 256                 __set_bit(ETHTOOL_LINK_MODE_100000baseSR2_Full_BIT, linkmodes);
 257                 __set_bit(ETHTOOL_LINK_MODE_100000baseCR2_Full_BIT, linkmodes);
 258                 __set_bit(ETHTOOL_LINK_MODE_100000baseLR2_ER2_FR2_Full_BIT,
 259                           linkmodes);
 260                 __set_bit(ETHTOOL_LINK_MODE_100000baseDR2_Full_BIT, linkmodes);
 261                 __set_bit(ETHTOOL_LINK_MODE_100000baseKR_Full_BIT, linkmodes);
 262                 __set_bit(ETHTOOL_LINK_MODE_100000baseSR_Full_BIT, linkmodes);
 263                 __set_bit(ETHTOOL_LINK_MODE_100000baseLR_ER_FR_Full_BIT,
 264                           linkmodes);
 265                 __set_bit(ETHTOOL_LINK_MODE_100000baseCR_Full_BIT, linkmodes);
 266                 __set_bit(ETHTOOL_LINK_MODE_100000baseDR_Full_BIT, linkmodes);
 267         }
 268
 269         if (caps & MAC_200000FD) {
 270                 __set_bit(ETHTOOL_LINK_MODE_200000baseKR4_Full_BIT, linkmodes);
 271                 __set_bit(ETHTOOL_LINK_MODE_200000baseSR4_Full_BIT, linkmodes);
 272                 __set_bit(ETHTOOL_LINK_MODE_200000baseLR4_ER4_FR4_Full_BIT,
 273                           linkmodes);
 274                 __set_bit(ETHTOOL_LINK_MODE_200000baseDR4_Full_BIT, linkmodes);
 275                 __set_bit(ETHTOOL_LINK_MODE_200000baseCR4_Full_BIT, linkmodes);
 276                 __set_bit(ETHTOOL_LINK_MODE_200000baseKR2_Full_BIT, linkmodes);
 277                 __set_bit(ETHTOOL_LINK_MODE_200000baseSR2_Full_BIT, linkmodes);
 278                 __set_bit(ETHTOOL_LINK_MODE_200000baseLR2_ER2_FR2_Full_BIT,
 279                           linkmodes);
 280                 __set_bit(ETHTOOL_LINK_MODE_200000baseDR2_Full_BIT, linkmodes);
 281                 __set_bit(ETHTOOL_LINK_MODE_200000baseCR2_Full_BIT, linkmodes);
 282         }
 283
 284         if (caps & MAC_400000FD) {
 285                 __set_bit(ETHTOOL_LINK_MODE_400000baseKR8_Full_BIT, linkmodes);
 286                 __set_bit(ETHTOOL_LINK_MODE_400000baseSR8_Full_BIT, linkmodes);
 287                 __set_bit(ETHTOOL_LINK_MODE_400000baseLR8_ER8_FR8_Full_BIT,
 288                           linkmodes);
 289                 __set_bit(ETHTOOL_LINK_MODE_400000baseDR8_Full_BIT, linkmodes);
 290                 __set_bit(ETHTOOL_LINK_MODE_400000baseCR8_Full_BIT, linkmodes);
 291                 __set_bit(ETHTOOL_LINK_MODE_400000baseKR4_Full_BIT, linkmodes);
 292                 __set_bit(ETHTOOL_LINK_MODE_400000baseSR4_Full_BIT, linkmodes);
 293                 __set_bit(ETHTOOL_LINK_MODE_400000baseLR4_ER4_FR4_Full_BIT,
 294                           linkmodes);
 295                 __set_bit(ETHTOOL_LINK_MODE_400000baseDR4_Full_BIT, linkmodes);
 296                 __set_bit(ETHTOOL_LINK_MODE_400000baseCR4_Full_BIT, linkmodes);
 297         }
 298 }
 299
 300 /**
 301  * phylink_get_linkmodes() - get acceptable link modes
 302  * @linkmodes: ethtool linkmode mask (must be already initialised)
 303  * @interface: phy interface mode defined by &typedef phy_interface_t
 304  * @mac_capabilities: bitmask of MAC capabilities
 305  *
 306  * Set all possible pause, speed and duplex linkmodes in @linkmodes that
 307  * are supported by the @interface mode and @mac_capabilities. @linkmodes
 308  * must have been initialised previously.
 309  */
 310 void phylink_get_linkmodes(unsigned long *linkmodes, phy_interface_t interface,
 311                            unsigned long mac_capabilities)
 312 {
 313         unsigned long caps = MAC_SYM_PAUSE | MAC_ASYM_PAUSE;
 314
 315         switch (interface) {
 316         case PHY_INTERFACE_MODE_USXGMII:
 317                 caps |= MAC_10000FD | MAC_5000FD | MAC_2500FD;
 318                 fallthrough;
 319
 320         case PHY_INTERFACE_MODE_RGMII_TXID:
 321         case PHY_INTERFACE_MODE_RGMII_RXID:
 322         case PHY_INTERFACE_MODE_RGMII_ID:
 323         case PHY_INTERFACE_MODE_RGMII:
 324         case PHY_INTERFACE_MODE_QSGMII:
 325         case PHY_INTERFACE_MODE_SGMII:
 326         case PHY_INTERFACE_MODE_GMII:
 327                 caps |= MAC_1000HD | MAC_1000FD;
 328                 fallthrough;
 329
 330         case PHY_INTERFACE_MODE_REVRMII:
 331         case PHY_INTERFACE_MODE_RMII:
 332         case PHY_INTERFACE_MODE_SMII:
 333         case PHY_INTERFACE_MODE_REVMII:
 334         case PHY_INTERFACE_MODE_MII:
 335                 caps |= MAC_10HD | MAC_10FD;
 336                 fallthrough;
 337
 338         case PHY_INTERFACE_MODE_100BASEX:
 339                 caps |= MAC_100HD | MAC_100FD;
 340                 break;
 341
 342         case PHY_INTERFACE_MODE_TBI:
 343         case PHY_INTERFACE_MODE_MOCA:
 344         case PHY_INTERFACE_MODE_RTBI:
 345         case PHY_INTERFACE_MODE_1000BASEX:
 346                 caps |= MAC_1000HD;
 347                 fallthrough;
 348         case PHY_INTERFACE_MODE_TRGMII:
 349                 caps |= MAC_1000FD;
 350                 break;
 351
 352         case PHY_INTERFACE_MODE_2500BASEX:
 353                 caps |= MAC_2500FD;
 354                 break;
 355
 356         case PHY_INTERFACE_MODE_5GBASER:
 357                 caps |= MAC_5000FD;
 358                 break;
 359
 360         case PHY_INTERFACE_MODE_XGMII:
 361         case PHY_INTERFACE_MODE_RXAUI:
 362         case PHY_INTERFACE_MODE_XAUI:
 363         case PHY_INTERFACE_MODE_10GBASER:
 364         case PHY_INTERFACE_MODE_10GKR:
 365                 caps |= MAC_10000FD;
 366                 break;
 367
 368         case PHY_INTERFACE_MODE_25GBASER:
 369                 caps |= MAC_25000FD;
 370                 break;
 371
 372         case PHY_INTERFACE_MODE_XLGMII:
 373                 caps |= MAC_40000FD;
 374                 break;
 375
 376         case PHY_INTERFACE_MODE_INTERNAL:
 377                 caps |= ~0;
 378                 break;
 379
 380         case PHY_INTERFACE_MODE_NA:
 381         case PHY_INTERFACE_MODE_MAX:
 382                 break;
 383         }
 384
 385         phylink_caps_to_linkmodes(linkmodes, caps & mac_capabilities);
 386 }
 387 EXPORT_SYMBOL_GPL(phylink_get_linkmodes);
 388
 389 /**
 390  * phylink_generic_validate() - generic validate() callback implementation
 391  * @config: a pointer to a &struct phylink_config.
 392  * @supported: ethtool bitmask for supported link modes.
 393  * @state: a pointer to a &struct phylink_link_state.
 394  *
 395  * Generic implementation of the validate() callback that MAC drivers can
 396  * use when they pass the range of supported interfaces and MAC capabilities.
 397  * This makes use of phylink_get_linkmodes().
 398  */
 399 void phylink_generic_validate(struct phylink_config *config,
 400                               unsigned long *supported,
 401                               struct phylink_link_state *state)
 402 {
 403         __ETHTOOL_DECLARE_LINK_MODE_MASK(mask) = { 0, };
 404
 405         phylink_set_port_modes(mask);
 406         phylink_set(mask, Autoneg);
 407         phylink_get_linkmodes(mask, state->interface, config->mac_capabilities);
 408
 409         linkmode_and(supported, supported, mask);
 410         linkmode_and(state->advertising, state->advertising, mask);
 411 }
 412 EXPORT_SYMBOL_GPL(phylink_generic_validate);
 413
 414 static int phylink_validate_mac_and_pcs(struct phylink *pl,
 415                                         unsigned long *supported,
 416                                         struct phylink_link_state *state)
 417 {
 418         struct phylink_pcs *pcs;
 419         int ret;
 420
 421         /* Get the PCS for this interface mode */
 422         if (pl->using_mac_select_pcs) {
 423                 pcs = pl->mac_ops->mac_select_pcs(pl->config, state->interface);
 424                 if (IS_ERR(pcs))
 425                         return PTR_ERR(pcs);
 426         } else {
 427                 pcs = pl->pcs;
 428         }
 429
 430         if (pcs) {
 431                 /* The PCS, if present, must be setup before phylink_create()
 432                  * has been called. If the ops is not initialised, print an
 433                  * error and backtrace rather than oopsing the kernel.
 434                  */
 435                 if (!pcs->ops) {
 436                         phylink_err(pl, "interface %s: uninitialised PCS\n",
 437                                     phy_modes(state->interface));
 438                         dump_stack();
 439                         return -EINVAL;
 440                 }
 441
 442                 /* Validate the link parameters with the PCS */
 443                 if (pcs->ops->pcs_validate) {
 444                         ret = pcs->ops->pcs_validate(pcs, supported, state);
 445                         if (ret < 0 || phylink_is_empty_linkmode(supported))
 446                                 return -EINVAL;
 447
 448                         /* Ensure the advertising mask is a subset of the
 449                          * supported mask.
 450                          */
 451                         linkmode_and(state->advertising, state->advertising,
 452                                      supported);
 453                 }
 454         }
 455
 456         /* Then validate the link parameters with the MAC */
 457         pl->mac_ops->validate(pl->config, supported, state);
 458
 459         return phylink_is_empty_linkmode(supported) ? -EINVAL : 0;
 460 }
 461
 462 static int phylink_validate_any(struct phylink *pl, unsigned long *supported,
 463                                 struct phylink_link_state *state)
 464 {
 465         __ETHTOOL_DECLARE_LINK_MODE_MASK(all_adv) = { 0, };
 466         __ETHTOOL_DECLARE_LINK_MODE_MASK(all_s) = { 0, };
 467         __ETHTOOL_DECLARE_LINK_MODE_MASK(s);
 468         struct phylink_link_state t;
 469         int intf;
 470
 471         for (intf = 0; intf < PHY_INTERFACE_MODE_MAX; intf++) {
 472                 if (test_bit(intf, pl->config->supported_interfaces)) {
 473                         linkmode_copy(s, supported);
 474
 475                         t = *state;
 476                         t.interface = intf;
 477                         if (!phylink_validate_mac_and_pcs(pl, s, &t)) {
 478                                 linkmode_or(all_s, all_s, s);
 479                                 linkmode_or(all_adv, all_adv, t.advertising);
 480                         }
 481                 }
 482         }
 483
 484         linkmode_copy(supported, all_s);
 485         linkmode_copy(state->advertising, all_adv);
 486
 487         return phylink_is_empty_linkmode(supported) ? -EINVAL : 0;
 488 }
 489
 490 static int phylink_validate(struct phylink *pl, unsigned long *supported,
 491                             struct phylink_link_state *state)
 492 {
 493         if (!phy_interface_empty(pl->config->supported_interfaces)) {
 494                 if (state->interface == PHY_INTERFACE_MODE_NA)
 495                         return phylink_validate_any(pl, supported, state);
 496
 497                 if (!test_bit(state->interface,
 498                               pl->config->supported_interfaces))
 499                         return -EINVAL;
 500         }
 501
 502         return phylink_validate_mac_and_pcs(pl, supported, state);
 503 }
 504
 505 static int phylink_parse_fixedlink(struct phylink *pl,
 506                                    struct fwnode_handle *fwnode)
 507 {
 508         struct fwnode_handle *fixed_node;
 509         const struct phy_setting *s;
 510         struct gpio_desc *desc;
 511         u32 speed;
 512         int ret;
 513
 514         fixed_node = fwnode_get_named_child_node(fwnode, "fixed-link");
 515         if (fixed_node) {
 516                 ret = fwnode_property_read_u32(fixed_node, "speed", &speed);
 517
 518                 pl->link_config.speed = speed;
 519                 pl->link_config.duplex = DUPLEX_HALF;
 520
 521                 if (fwnode_property_read_bool(fixed_node, "full-duplex"))
 522                         pl->link_config.duplex = DUPLEX_FULL;
 523
 524                 /* We treat the "pause" and "asym-pause" terminology as
 525                  * defining the link partner's ability.
 526                  */
 527                 if (fwnode_property_read_bool(fixed_node, "pause"))
 528                         __set_bit(ETHTOOL_LINK_MODE_Pause_BIT,
 529                                   pl->link_config.lp_advertising);
 530                 if (fwnode_property_read_bool(fixed_node, "asym-pause"))
 531                         __set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
 532                                   pl->link_config.lp_advertising);
 533
 534                 if (ret == 0) {
 535                         desc = fwnode_gpiod_get_index(fixed_node, "link", 0,
 536                                                       GPIOD_IN, "?");
 537
 538                         if (!IS_ERR(desc))
 539                                 pl->link_gpio = desc;
 540                         else if (desc == ERR_PTR(-EPROBE_DEFER))
 541                                 ret = -EPROBE_DEFER;
 542                 }
 543                 fwnode_handle_put(fixed_node);
 544
 545                 if (ret)
 546                         return ret;
 547         } else {
 548                 u32 prop[5];
 549
 550                 ret = fwnode_property_read_u32_array(fwnode, "fixed-link",
 551                                                      NULL, 0);
 552                 if (ret != ARRAY_SIZE(prop)) {
 553                         phylink_err(pl, "broken fixed-link?\n");
 554                         return -EINVAL;
 555                 }
 556
 557                 ret = fwnode_property_read_u32_array(fwnode, "fixed-link",
 558                                                      prop, ARRAY_SIZE(prop));
 559                 if (!ret) {
 560                         pl->link_config.duplex = prop[1] ?
 561                                                 DUPLEX_FULL : DUPLEX_HALF;
 562                         pl->link_config.speed = prop[2];
 563                         if (prop[3])
 564                                 __set_bit(ETHTOOL_LINK_MODE_Pause_BIT,
 565                                           pl->link_config.lp_advertising);
 566                         if (prop[4])
 567                                 __set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
 568                                           pl->link_config.lp_advertising);
 569                 }
 570         }
 571
 572         if (pl->link_config.speed > SPEED_1000 &&
 573             pl->link_config.duplex != DUPLEX_FULL)
 574                 phylink_warn(pl, "fixed link specifies half duplex for %dMbps link?\n",
 575                              pl->link_config.speed);
 576
 577         bitmap_fill(pl->supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
 578         linkmode_copy(pl->link_config.advertising, pl->supported);
 579         phylink_validate(pl, pl->supported, &pl->link_config);
 580
 581         s = phy_lookup_setting(pl->link_config.speed, pl->link_config.duplex,
 582                                pl->supported, true);
 583         linkmode_zero(pl->supported);
 584         phylink_set(pl->supported, MII);
 585         phylink_set(pl->supported, Pause);
 586         phylink_set(pl->supported, Asym_Pause);
 587         phylink_set(pl->supported, Autoneg);
 588         if (s) {
 589                 __set_bit(s->bit, pl->supported);
 590                 __set_bit(s->bit, pl->link_config.lp_advertising);
 591         } else {
 592                 phylink_warn(pl, "fixed link %s duplex %dMbps not recognised\n",
 593                              pl->link_config.duplex == DUPLEX_FULL ? "full" : "half",
 594                              pl->link_config.speed);
 595         }
 596
 597         linkmode_and(pl->link_config.advertising, pl->link_config.advertising,
 598                      pl->supported);
 599
 600         pl->link_config.link = 1;
 601         pl->link_config.an_complete = 1;
 602
 603         return 0;
 604 }
 605
 606 static int phylink_parse_mode(struct phylink *pl, struct fwnode_handle *fwnode)
 607 {
 608         struct fwnode_handle *dn;
 609         const char *managed;
 610
 611         dn = fwnode_get_named_child_node(fwnode, "fixed-link");
 612         if (dn || fwnode_property_present(fwnode, "fixed-link"))
 613                 pl->cfg_link_an_mode = MLO_AN_FIXED;
 614         fwnode_handle_put(dn);
 615
 616         if ((fwnode_property_read_string(fwnode, "managed", &managed) == 0 &&
 617              strcmp(managed, "in-band-status") == 0) ||
 618             pl->config->ovr_an_inband) {
 619                 if (pl->cfg_link_an_mode == MLO_AN_FIXED) {
 620                         phylink_err(pl,
 621                                     "can't use both fixed-link and in-band-status\n");
 622                         return -EINVAL;
 623                 }
 624
 625                 linkmode_zero(pl->supported);
 626                 phylink_set(pl->supported, MII);
 627                 phylink_set(pl->supported, Autoneg);
 628                 phylink_set(pl->supported, Asym_Pause);
 629                 phylink_set(pl->supported, Pause);
 630                 pl->link_config.an_enabled = true;
 631                 pl->cfg_link_an_mode = MLO_AN_INBAND;
 632
 633                 switch (pl->link_config.interface) {
 634                 case PHY_INTERFACE_MODE_SGMII:
 635                 case PHY_INTERFACE_MODE_QSGMII:
 636                         phylink_set(pl->supported, 10baseT_Half);
 637                         phylink_set(pl->supported, 10baseT_Full);
 638                         phylink_set(pl->supported, 100baseT_Half);
 639                         phylink_set(pl->supported, 100baseT_Full);
 640                         phylink_set(pl->supported, 1000baseT_Half);
 641                         phylink_set(pl->supported, 1000baseT_Full);
 642                         break;
 643
 644                 case PHY_INTERFACE_MODE_1000BASEX:
 645                         phylink_set(pl->supported, 1000baseX_Full);
 646                         break;
 647
 648                 case PHY_INTERFACE_MODE_2500BASEX:
 649                         phylink_set(pl->supported, 2500baseX_Full);
 650                         break;
 651
 652                 case PHY_INTERFACE_MODE_5GBASER:
 653                         phylink_set(pl->supported, 5000baseT_Full);
 654                         break;
 655
 656                 case PHY_INTERFACE_MODE_25GBASER:
 657                         phylink_set(pl->supported, 25000baseCR_Full);
 658                         phylink_set(pl->supported, 25000baseKR_Full);
 659                         phylink_set(pl->supported, 25000baseSR_Full);
 660                         fallthrough;
 661                 case PHY_INTERFACE_MODE_USXGMII:
 662                 case PHY_INTERFACE_MODE_10GKR:
 663                 case PHY_INTERFACE_MODE_10GBASER:
 664                         phylink_set(pl->supported, 10baseT_Half);
 665                         phylink_set(pl->supported, 10baseT_Full);
 666                         phylink_set(pl->supported, 100baseT_Half);
 667                         phylink_set(pl->supported, 100baseT_Full);
 668                         phylink_set(pl->supported, 1000baseT_Half);
 669                         phylink_set(pl->supported, 1000baseT_Full);
 670                         phylink_set(pl->supported, 1000baseX_Full);
 671                         phylink_set(pl->supported, 1000baseKX_Full);
 672                         phylink_set(pl->supported, 2500baseT_Full);
 673                         phylink_set(pl->supported, 2500baseX_Full);
 674                         phylink_set(pl->supported, 5000baseT_Full);
 675                         phylink_set(pl->supported, 10000baseT_Full);
 676                         phylink_set(pl->supported, 10000baseKR_Full);
 677                         phylink_set(pl->supported, 10000baseKX4_Full);
 678                         phylink_set(pl->supported, 10000baseCR_Full);
 679                         phylink_set(pl->supported, 10000baseSR_Full);
 680                         phylink_set(pl->supported, 10000baseLR_Full);
 681                         phylink_set(pl->supported, 10000baseLRM_Full);
 682                         phylink_set(pl->supported, 10000baseER_Full);
 683                         break;
 684
 685                 case PHY_INTERFACE_MODE_XLGMII:
 686                         phylink_set(pl->supported, 25000baseCR_Full);
 687                         phylink_set(pl->supported, 25000baseKR_Full);
 688                         phylink_set(pl->supported, 25000baseSR_Full);
 689                         phylink_set(pl->supported, 40000baseKR4_Full);
 690                         phylink_set(pl->supported, 40000baseCR4_Full);
 691                         phylink_set(pl->supported, 40000baseSR4_Full);
 692                         phylink_set(pl->supported, 40000baseLR4_Full);
 693                         phylink_set(pl->supported, 50000baseCR2_Full);
 694                         phylink_set(pl->supported, 50000baseKR2_Full);
 695                         phylink_set(pl->supported, 50000baseSR2_Full);
 696                         phylink_set(pl->supported, 50000baseKR_Full);
 697                         phylink_set(pl->supported, 50000baseSR_Full);
 698                         phylink_set(pl->supported, 50000baseCR_Full);
 699                         phylink_set(pl->supported, 50000baseLR_ER_FR_Full);
 700                         phylink_set(pl->supported, 50000baseDR_Full);
 701                         phylink_set(pl->supported, 100000baseKR4_Full);
 702                         phylink_set(pl->supported, 100000baseSR4_Full);
 703                         phylink_set(pl->supported, 100000baseCR4_Full);
 704                         phylink_set(pl->supported, 100000baseLR4_ER4_Full);
 705                         phylink_set(pl->supported, 100000baseKR2_Full);
 706                         phylink_set(pl->supported, 100000baseSR2_Full);
 707                         phylink_set(pl->supported, 100000baseCR2_Full);
 708                         phylink_set(pl->supported, 100000baseLR2_ER2_FR2_Full);
 709                         phylink_set(pl->supported, 100000baseDR2_Full);
 710                         break;
 711
 712                 default:
 713                         phylink_err(pl,
 714                                     "incorrect link mode %s for in-band status\n",
 715                                     phy_modes(pl->link_config.interface));
 716                         return -EINVAL;
 717                 }
 718
 719                 linkmode_copy(pl->link_config.advertising, pl->supported);
 720
 721                 if (phylink_validate(pl, pl->supported, &pl->link_config)) {
 722                         phylink_err(pl,
 723                                     "failed to validate link configuration for in-band status\n");
 724                         return -EINVAL;
 725                 }
 726
 727                 /* Check if MAC/PCS also supports Autoneg. */
 728                 pl->link_config.an_enabled = phylink_test(pl->supported, Autoneg);
 729         }
 730
 731         return 0;
 732 }
 733
 734 static void phylink_apply_manual_flow(struct phylink *pl,
 735                                       struct phylink_link_state *state)
 736 {
 737         /* If autoneg is disabled, pause AN is also disabled */
 738         if (!state->an_enabled)
 739                 state->pause &= ~MLO_PAUSE_AN;
 740
 741         /* Manual configuration of pause modes */
 742         if (!(pl->link_config.pause & MLO_PAUSE_AN))
 743                 state->pause = pl->link_config.pause;
 744 }
 745
 746 static void phylink_resolve_flow(struct phylink_link_state *state)
 747 {
 748         bool tx_pause, rx_pause;
 749
 750         state->pause = MLO_PAUSE_NONE;
 751         if (state->duplex == DUPLEX_FULL) {
 752                 linkmode_resolve_pause(state->advertising,
 753                                        state->lp_advertising,
 754                                        &tx_pause, &rx_pause);
 755                 if (tx_pause)
 756                         state->pause |= MLO_PAUSE_TX;
 757                 if (rx_pause)
 758                         state->pause |= MLO_PAUSE_RX;
 759         }
 760 }
 761
 762 static void phylink_mac_config(struct phylink *pl,
 763                                const struct phylink_link_state *state)
 764 {
 765         phylink_dbg(pl,
 766                     "%s: mode=%s/%s/%s/%s adv=%*pb pause=%02x link=%u an=%u\n",
 767                     __func__, phylink_an_mode_str(pl->cur_link_an_mode),
 768                     phy_modes(state->interface),
 769                     phy_speed_to_str(state->speed),
 770                     phy_duplex_to_str(state->duplex),
 771                     __ETHTOOL_LINK_MODE_MASK_NBITS, state->advertising,
 772                     state->pause, state->link, state->an_enabled);
 773
 774         pl->mac_ops->mac_config(pl->config, pl->cur_link_an_mode, state);
 775 }
 776
 777 static void phylink_mac_pcs_an_restart(struct phylink *pl)
 778 {
 779         if (pl->link_config.an_enabled &&
 780             phy_interface_mode_is_8023z(pl->link_config.interface) &&
 781             phylink_autoneg_inband(pl->cur_link_an_mode)) {
 782                 if (pl->pcs_ops)
 783                         pl->pcs_ops->pcs_an_restart(pl->pcs);
 784                 else if (pl->config->legacy_pre_march2020)
 785                         pl->mac_ops->mac_an_restart(pl->config);
 786         }
 787 }
 788
 789 static void phylink_major_config(struct phylink *pl, bool restart,
 790                                   const struct phylink_link_state *state)
 791 {
 792         struct phylink_pcs *pcs = NULL;
 793         int err;
 794
 795         phylink_dbg(pl, "major config %s\n", phy_modes(state->interface));
 796
 797         if (pl->using_mac_select_pcs) {
 798                 pcs = pl->mac_ops->mac_select_pcs(pl->config, state->interface);
 799                 if (IS_ERR(pcs)) {
 800                         phylink_err(pl,
 801                                     "mac_select_pcs unexpectedly failed: %pe\n",
 802                                     pcs);
 803                         return;
 804                 }
 805         }
 806
 807         if (pl->mac_ops->mac_prepare) {
 808                 err = pl->mac_ops->mac_prepare(pl->config, pl->cur_link_an_mode,
 809                                                state->interface);
 810                 if (err < 0) {
 811                         phylink_err(pl, "mac_prepare failed: %pe\n",
 812                                     ERR_PTR(err));
 813                         return;
 814                 }
 815         }
 816
 817         /* If we have a new PCS, switch to the new PCS after preparing the MAC
 818          * for the change.
 819          */
 820         if (pcs) {
 821                 pl->pcs = pcs;
 822                 pl->pcs_ops = pcs->ops;
 823
 824                 if (!pl->phylink_disable_state &&
 825                     pl->cfg_link_an_mode == MLO_AN_INBAND) {
 826                         if (pcs->poll)
 827                                 mod_timer(&pl->link_poll, jiffies + HZ);
 828                         else
 829                                 del_timer(&pl->link_poll);
 830                 }
 831         }
 832
 833         phylink_mac_config(pl, state);
 834
 835         if (pl->pcs_ops) {
 836                 err = pl->pcs_ops->pcs_config(pl->pcs, pl->cur_link_an_mode,
 837                                               state->interface,
 838                                               state->advertising,
 839                                               !!(pl->link_config.pause &
 840                                                  MLO_PAUSE_AN));
 841                 if (err < 0)
 842                         phylink_err(pl, "pcs_config failed: %pe\n",
 843                                     ERR_PTR(err));
 844                 if (err > 0)
 845                         restart = true;
 846         }
 847         if (restart)
 848                 phylink_mac_pcs_an_restart(pl);
 849
 850         if (pl->mac_ops->mac_finish) {
 851                 err = pl->mac_ops->mac_finish(pl->config, pl->cur_link_an_mode,
 852                                               state->interface);
 853                 if (err < 0)
 854                         phylink_err(pl, "mac_finish failed: %pe\n",
 855                                     ERR_PTR(err));
 856         }
 857 }
 858
 859 /*
 860  * Reconfigure for a change of inband advertisement.
 861  * If we have a separate PCS, we only need to call its pcs_config() method,
 862  * and then restart AN if it indicates something changed. Otherwise, we do
 863  * the full MAC reconfiguration.
 864  */
 865 static int phylink_change_inband_advert(struct phylink *pl)
 866 {
 867         int ret;
 868
 869         if (test_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state))
 870                 return 0;
 871
 872         if (!pl->pcs_ops && pl->config->legacy_pre_march2020) {
 873                 /* Legacy method */
 874                 phylink_mac_config(pl, &pl->link_config);
 875                 phylink_mac_pcs_an_restart(pl);
 876                 return 0;
 877         }
 878
 879         phylink_dbg(pl, "%s: mode=%s/%s adv=%*pb pause=%02x\n", __func__,
 880                     phylink_an_mode_str(pl->cur_link_an_mode),
 881                     phy_modes(pl->link_config.interface),
 882                     __ETHTOOL_LINK_MODE_MASK_NBITS, pl->link_config.advertising,
 883                     pl->link_config.pause);
 884
 885         /* Modern PCS-based method; update the advert at the PCS, and
 886          * restart negotiation if the pcs_config() helper indicates that
 887          * the programmed advertisement has changed.
 888          */
 889         ret = pl->pcs_ops->pcs_config(pl->pcs, pl->cur_link_an_mode,
 890                                       pl->link_config.interface,
 891                                       pl->link_config.advertising,
 892                                       !!(pl->link_config.pause & MLO_PAUSE_AN));
 893         if (ret < 0)
 894                 return ret;
 895
 896         if (ret > 0)
 897                 phylink_mac_pcs_an_restart(pl);
 898
 899         return 0;
 900 }
 901
 902 static void phylink_mac_pcs_get_state(struct phylink *pl,
 903                                       struct phylink_link_state *state)
 904 {
 905         linkmode_copy(state->advertising, pl->link_config.advertising);
 906         linkmode_zero(state->lp_advertising);
 907         state->interface = pl->link_config.interface;
 908         state->an_enabled = pl->link_config.an_enabled;
 909         if  (state->an_enabled) {
 910                 state->speed = SPEED_UNKNOWN;
 911                 state->duplex = DUPLEX_UNKNOWN;
 912                 state->pause = MLO_PAUSE_NONE;
 913         } else {
 914                 state->speed =  pl->link_config.speed;
 915                 state->duplex = pl->link_config.duplex;
 916                 state->pause = pl->link_config.pause;
 917         }
 918         state->an_complete = 0;
 919         state->link = 1;
 920
 921         if (pl->pcs_ops)
 922                 pl->pcs_ops->pcs_get_state(pl->pcs, state);
 923         else if (pl->mac_ops->mac_pcs_get_state &&
 924                  pl->config->legacy_pre_march2020)
 925                 pl->mac_ops->mac_pcs_get_state(pl->config, state);
 926         else
 927                 state->link = 0;
 928 }
 929
 930 /* The fixed state is... fixed except for the link state,
 931  * which may be determined by a GPIO or a callback.
 932  */
 933 static void phylink_get_fixed_state(struct phylink *pl,
 934                                     struct phylink_link_state *state)
 935 {
 936         *state = pl->link_config;
 937         if (pl->config->get_fixed_state)
 938                 pl->config->get_fixed_state(pl->config, state);
 939         else if (pl->link_gpio)
 940                 state->link = !!gpiod_get_value_cansleep(pl->link_gpio);
 941
 942         phylink_resolve_flow(state);
 943 }
 944
 945 static void phylink_mac_initial_config(struct phylink *pl, bool force_restart)
 946 {
 947         struct phylink_link_state link_state;
 948
 949         switch (pl->cur_link_an_mode) {
 950         case MLO_AN_PHY:
 951                 link_state = pl->phy_state;
 952                 break;
 953
 954         case MLO_AN_FIXED:
 955                 phylink_get_fixed_state(pl, &link_state);
 956                 break;
 957
 958         case MLO_AN_INBAND:
 959                 link_state = pl->link_config;
 960                 if (link_state.interface == PHY_INTERFACE_MODE_SGMII)
 961                         link_state.pause = MLO_PAUSE_NONE;
 962                 break;
 963
 964         default: /* can't happen */
 965                 return;
 966         }
 967
 968         link_state.link = false;
 969
 970         phylink_apply_manual_flow(pl, &link_state);
 971         phylink_major_config(pl, force_restart, &link_state);
 972 }
 973
 974 static const char *phylink_pause_to_str(int pause)
 975 {
 976         switch (pause & MLO_PAUSE_TXRX_MASK) {
 977         case MLO_PAUSE_TX | MLO_PAUSE_RX:
 978                 return "rx/tx";
 979         case MLO_PAUSE_TX:
 980                 return "tx";
 981         case MLO_PAUSE_RX:
 982                 return "rx";
 983         default:
 984                 return "off";
 985         }
 986 }
 987
 988 static void phylink_link_up(struct phylink *pl,
 989                             struct phylink_link_state link_state)
 990 {
 991         struct net_device *ndev = pl->netdev;
 992
 993         pl->cur_interface = link_state.interface;
 994
 995         if (pl->pcs_ops && pl->pcs_ops->pcs_link_up)
 996                 pl->pcs_ops->pcs_link_up(pl->pcs, pl->cur_link_an_mode,
 997                                          pl->cur_interface,
 998                                          link_state.speed, link_state.duplex);
 999
1000         pl->mac_ops->mac_link_up(pl->config, pl->phydev,
1001                                  pl->cur_link_an_mode, pl->cur_interface,
1002                                  link_state.speed, link_state.duplex,
1003                                  !!(link_state.pause & MLO_PAUSE_TX),
1004                                  !!(link_state.pause & MLO_PAUSE_RX));
1005
1006         if (ndev)
1007                 netif_carrier_on(ndev);
1008
1009         phylink_info(pl,
1010                      "Link is Up - %s/%s - flow control %s\n",
1011                      phy_speed_to_str(link_state.speed),
1012                      phy_duplex_to_str(link_state.duplex),
1013                      phylink_pause_to_str(link_state.pause));
1014 }
1015
1016 static void phylink_link_down(struct phylink *pl)
1017 {
1018         struct net_device *ndev = pl->netdev;
1019
1020         if (ndev)
1021                 netif_carrier_off(ndev);
1022         pl->mac_ops->mac_link_down(pl->config, pl->cur_link_an_mode,
1023                                    pl->cur_interface);
1024         phylink_info(pl, "Link is Down\n");
1025 }
1026
1027 static void phylink_resolve(struct work_struct *w)
1028 {
1029         struct phylink *pl = container_of(w, struct phylink, resolve);
1030         struct phylink_link_state link_state;
1031         struct net_device *ndev = pl->netdev;
1032         bool mac_config = false;
1033         bool retrigger = false;
1034         bool cur_link_state;
1035
1036         mutex_lock(&pl->state_mutex);
1037         if (pl->netdev)
1038                 cur_link_state = netif_carrier_ok(ndev);
1039         else
1040                 cur_link_state = pl->old_link_state;
1041
1042         if (pl->phylink_disable_state) {
1043                 pl->mac_link_dropped = false;
1044                 link_state.link = false;
1045         } else if (pl->mac_link_dropped) {
1046                 link_state.link = false;
1047                 retrigger = true;
1048         } else {
1049                 switch (pl->cur_link_an_mode) {
1050                 case MLO_AN_PHY:
1051                         link_state = pl->phy_state;
1052                         phylink_apply_manual_flow(pl, &link_state);
1053                         mac_config = link_state.link;
1054                         break;
1055
1056                 case MLO_AN_FIXED:
1057                         phylink_get_fixed_state(pl, &link_state);
1058                         mac_config = link_state.link;
1059                         break;
1060
1061                 case MLO_AN_INBAND:
1062                         phylink_mac_pcs_get_state(pl, &link_state);
1063
1064                         /* The PCS may have a latching link-fail indicator.
1065                          * If the link was up, bring the link down and
1066                          * re-trigger the resolve. Otherwise, re-read the
1067                          * PCS state to get the current status of the link.
1068                          */
1069                         if (!link_state.link) {
1070                                 if (cur_link_state)
1071                                         retrigger = true;
1072                                 else
1073                                         phylink_mac_pcs_get_state(pl,
1074                                                                   &link_state);
1075                         }
1076
1077                         /* If we have a phy, the "up" state is the union of
1078                          * both the PHY and the MAC
1079                          */
1080                         if (pl->phydev)
1081                                 link_state.link &= pl->phy_state.link;
1082
1083                         /* Only update if the PHY link is up */
1084                         if (pl->phydev && pl->phy_state.link) {
1085                                 /* If the interface has changed, force a
1086                                  * link down event if the link isn't already
1087                                  * down, and re-resolve.
1088                                  */
1089                                 if (link_state.interface !=
1090                                     pl->phy_state.interface) {
1091                                         retrigger = true;
1092                                         link_state.link = false;
1093                                 }
1094                                 link_state.interface = pl->phy_state.interface;
1095
1096                                 /* If we have a PHY, we need to update with
1097                                  * the PHY flow control bits.
1098                                  */
1099                                 link_state.pause = pl->phy_state.pause;
1100                                 mac_config = true;
1101                         }
1102                         phylink_apply_manual_flow(pl, &link_state);
1103                         break;
1104                 }
1105         }
1106
1107         if (mac_config) {
1108                 if (link_state.interface != pl->link_config.interface) {
1109                         /* The interface has changed, force the link down and
1110                          * then reconfigure.
1111                          */
1112                         if (cur_link_state) {
1113                                 phylink_link_down(pl);
1114                                 cur_link_state = false;
1115                         }
1116                         phylink_major_config(pl, false, &link_state);
1117                         pl->link_config.interface = link_state.interface;
1118                 } else if (!pl->pcs_ops && pl->config->legacy_pre_march2020) {
1119                         /* The interface remains unchanged, only the speed,
1120                          * duplex or pause settings have changed. Call the
1121                          * old mac_config() method to configure the MAC/PCS
1122                          * only if we do not have a legacy MAC driver.
1123                          */
1124                         phylink_mac_config(pl, &link_state);
1125                 }
1126         }
1127
1128         if (link_state.link != cur_link_state) {
1129                 pl->old_link_state = link_state.link;
1130                 if (!link_state.link)
1131                         phylink_link_down(pl);
1132                 else
1133                         phylink_link_up(pl, link_state);
1134         }
1135         if (!link_state.link && retrigger) {
1136                 pl->mac_link_dropped = false;
1137                 queue_work(system_power_efficient_wq, &pl->resolve);
1138         }
1139         mutex_unlock(&pl->state_mutex);
1140 }
1141
1142 static void phylink_run_resolve(struct phylink *pl)
1143 {
1144         if (!pl->phylink_disable_state)
1145                 queue_work(system_power_efficient_wq, &pl->resolve);
1146 }
1147
1148 static void phylink_run_resolve_and_disable(struct phylink *pl, int bit)
1149 {
1150         unsigned long state = pl->phylink_disable_state;
1151
1152         set_bit(bit, &pl->phylink_disable_state);
1153         if (state == 0) {
1154                 queue_work(system_power_efficient_wq, &pl->resolve);
1155                 flush_work(&pl->resolve);
1156         }
1157 }
1158
1159 static void phylink_enable_and_run_resolve(struct phylink *pl, int bit)
1160 {
1161         clear_bit(bit, &pl->phylink_disable_state);
1162         phylink_run_resolve(pl);
1163 }
1164
1165 static void phylink_fixed_poll(struct timer_list *t)
1166 {
1167         struct phylink *pl = container_of(t, struct phylink, link_poll);
1168
1169         mod_timer(t, jiffies + HZ);
1170
1171         phylink_run_resolve(pl);
1172 }
1173
1174 static const struct sfp_upstream_ops sfp_phylink_ops;
1175
1176 static int phylink_register_sfp(struct phylink *pl,
1177                                 struct fwnode_handle *fwnode)
1178 {
1179         struct sfp_bus *bus;
1180         int ret;
1181
1182         if (!fwnode)
1183                 return 0;
1184
1185         bus = sfp_bus_find_fwnode(fwnode);
1186         if (IS_ERR(bus)) {
1187                 phylink_err(pl, "unable to attach SFP bus: %pe\n", bus);
1188                 return PTR_ERR(bus);
1189         }
1190
1191         pl->sfp_bus = bus;
1192
1193         ret = sfp_bus_add_upstream(bus, pl, &sfp_phylink_ops);
1194         sfp_bus_put(bus);
1195
1196         return ret;
1197 }
1198
1199 /**
1200  * phylink_create() - create a phylink instance
1201  * @config: a pointer to the target &struct phylink_config
1202  * @fwnode: a pointer to a &struct fwnode_handle describing the network
1203  *      interface
1204  * @iface: the desired link mode defined by &typedef phy_interface_t
1205  * @mac_ops: a pointer to a &struct phylink_mac_ops for the MAC.
1206  *
1207  * Create a new phylink instance, and parse the link parameters found in @np.
1208  * This will parse in-band modes, fixed-link or SFP configuration.
1209  *
1210  * Note: the rtnl lock must not be held when calling this function.
1211  *
1212  * Returns a pointer to a &struct phylink, or an error-pointer value. Users
1213  * must use IS_ERR() to check for errors from this function.
1214  */
1215 struct phylink *phylink_create(struct phylink_config *config,
1216                                struct fwnode_handle *fwnode,
1217                                phy_interface_t iface,
1218                                const struct phylink_mac_ops *mac_ops)
1219 {
1220         bool using_mac_select_pcs = false;
1221         struct phylink *pl;
1222         int ret;
1223
1224         if (mac_ops->mac_select_pcs &&
1225             mac_ops->mac_select_pcs(config, PHY_INTERFACE_MODE_NA) !=
1226               ERR_PTR(-EOPNOTSUPP))
1227                 using_mac_select_pcs = true;
1228
1229         /* Validate the supplied configuration */
1230         if (using_mac_select_pcs &&
1231             phy_interface_empty(config->supported_interfaces)) {
1232                 dev_err(config->dev,
1233                         "phylink: error: empty supported_interfaces but mac_select_pcs() method present\n");
1234                 return ERR_PTR(-EINVAL);
1235         }
1236
1237         pl = kzalloc(sizeof(*pl), GFP_KERNEL);
1238         if (!pl)
1239                 return ERR_PTR(-ENOMEM);
1240
1241         mutex_init(&pl->state_mutex);
1242         INIT_WORK(&pl->resolve, phylink_resolve);
1243
1244         pl->config = config;
1245         if (config->type == PHYLINK_NETDEV) {
1246                 pl->netdev = to_net_dev(config->dev);
1247         } else if (config->type == PHYLINK_DEV) {
1248                 pl->dev = config->dev;
1249         } else {
1250                 kfree(pl);
1251                 return ERR_PTR(-EINVAL);
1252         }
1253
1254         pl->using_mac_select_pcs = using_mac_select_pcs;
1255         pl->phy_state.interface = iface;
1256         pl->link_interface = iface;
1257         if (iface == PHY_INTERFACE_MODE_MOCA)
1258                 pl->link_port = PORT_BNC;
1259         else
1260                 pl->link_port = PORT_MII;
1261         pl->link_config.interface = iface;
1262         pl->link_config.pause = MLO_PAUSE_AN;
1263         pl->link_config.speed = SPEED_UNKNOWN;
1264         pl->link_config.duplex = DUPLEX_UNKNOWN;
1265         pl->link_config.an_enabled = true;
1266         pl->mac_ops = mac_ops;
1267         __set_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
1268         timer_setup(&pl->link_poll, phylink_fixed_poll, 0);
1269
1270         bitmap_fill(pl->supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
1271         linkmode_copy(pl->link_config.advertising, pl->supported);
1272         phylink_validate(pl, pl->supported, &pl->link_config);
1273
1274         ret = phylink_parse_mode(pl, fwnode);
1275         if (ret < 0) {
1276                 kfree(pl);
1277                 return ERR_PTR(ret);
1278         }
1279
1280         if (pl->cfg_link_an_mode == MLO_AN_FIXED) {
1281                 ret = phylink_parse_fixedlink(pl, fwnode);
1282                 if (ret < 0) {
1283                         kfree(pl);
1284                         return ERR_PTR(ret);
1285                 }
1286         }
1287
1288         pl->cur_link_an_mode = pl->cfg_link_an_mode;
1289
1290         ret = phylink_register_sfp(pl, fwnode);
1291         if (ret < 0) {
1292                 kfree(pl);
1293                 return ERR_PTR(ret);
1294         }
1295
1296         return pl;
1297 }
1298 EXPORT_SYMBOL_GPL(phylink_create);
1299
1300 /**
1301  * phylink_destroy() - cleanup and destroy the phylink instance
1302  * @pl: a pointer to a &struct phylink returned from phylink_create()
1303  *
1304  * Destroy a phylink instance. Any PHY that has been attached must have been
1305  * cleaned up via phylink_disconnect_phy() prior to calling this function.
1306  *
1307  * Note: the rtnl lock must not be held when calling this function.
1308  */
1309 void phylink_destroy(struct phylink *pl)
1310 {
1311         sfp_bus_del_upstream(pl->sfp_bus);
1312         if (pl->link_gpio)
1313                 gpiod_put(pl->link_gpio);
1314
1315         cancel_work_sync(&pl->resolve);
1316         kfree(pl);
1317 }
1318 EXPORT_SYMBOL_GPL(phylink_destroy);
1319
1320 static void phylink_phy_change(struct phy_device *phydev, bool up)
1321 {
1322         struct phylink *pl = phydev->phylink;
1323         bool tx_pause, rx_pause;
1324
1325         phy_get_pause(phydev, &tx_pause, &rx_pause);
1326
1327         mutex_lock(&pl->state_mutex);
1328         pl->phy_state.speed = phydev->speed;
1329         pl->phy_state.duplex = phydev->duplex;
1330         pl->phy_state.pause = MLO_PAUSE_NONE;
1331         if (tx_pause)
1332                 pl->phy_state.pause |= MLO_PAUSE_TX;
1333         if (rx_pause)
1334                 pl->phy_state.pause |= MLO_PAUSE_RX;
1335         pl->phy_state.interface = phydev->interface;
1336         pl->phy_state.link = up;
1337         mutex_unlock(&pl->state_mutex);
1338
1339         phylink_run_resolve(pl);
1340
1341         phylink_dbg(pl, "phy link %s %s/%s/%s/%s\n", up ? "up" : "down",
1342                     phy_modes(phydev->interface),
1343                     phy_speed_to_str(phydev->speed),
1344                     phy_duplex_to_str(phydev->duplex),
1345                     phylink_pause_to_str(pl->phy_state.pause));
1346 }
1347
1348 static int phylink_bringup_phy(struct phylink *pl, struct phy_device *phy,
1349                                phy_interface_t interface)
1350 {
1351         struct phylink_link_state config;
1352         __ETHTOOL_DECLARE_LINK_MODE_MASK(supported);
1353         char *irq_str;
1354         int ret;
1355
1356         /*
1357          * This is the new way of dealing with flow control for PHYs,
1358          * as described by Timur Tabi in commit 529ed1275263 ("net: phy:
1359          * phy drivers should not set SUPPORTED_[Asym_]Pause") except
1360          * using our validate call to the MAC, we rely upon the MAC
1361          * clearing the bits from both supported and advertising fields.
1362          */
1363         phy_support_asym_pause(phy);
1364
1365         memset(&config, 0, sizeof(config));
1366         linkmode_copy(supported, phy->supported);
1367         linkmode_copy(config.advertising, phy->advertising);
1368
1369         /* Clause 45 PHYs switch their Serdes lane between several different
1370          * modes, normally 10GBASE-R, SGMII. Some use 2500BASE-X for 2.5G
1371          * speeds. We really need to know which interface modes the PHY and
1372          * MAC supports to properly work out which linkmodes can be supported.
1373          */
1374         if (phy->is_c45 &&
1375             interface != PHY_INTERFACE_MODE_RXAUI &&
1376             interface != PHY_INTERFACE_MODE_XAUI &&
1377             interface != PHY_INTERFACE_MODE_USXGMII)
1378                 config.interface = PHY_INTERFACE_MODE_NA;
1379         else
1380                 config.interface = interface;
1381
1382         ret = phylink_validate(pl, supported, &config);
1383         if (ret) {
1384                 phylink_warn(pl, "validation of %s with support %*pb and advertisement %*pb failed: %pe\n",
1385                              phy_modes(config.interface),
1386                              __ETHTOOL_LINK_MODE_MASK_NBITS, phy->supported,
1387                              __ETHTOOL_LINK_MODE_MASK_NBITS, config.advertising,
1388                              ERR_PTR(ret));
1389                 return ret;
1390         }
1391
1392         phy->phylink = pl;
1393         phy->phy_link_change = phylink_phy_change;
1394
1395         irq_str = phy_attached_info_irq(phy);
1396         phylink_info(pl,
1397                      "PHY [%s] driver [%s] (irq=%s)\n",
1398                      dev_name(&phy->mdio.dev), phy->drv->name, irq_str);
1399         kfree(irq_str);
1400
1401         mutex_lock(&phy->lock);
1402         mutex_lock(&pl->state_mutex);
1403         pl->phydev = phy;
1404         pl->phy_state.interface = interface;
1405         pl->phy_state.pause = MLO_PAUSE_NONE;
1406         pl->phy_state.speed = SPEED_UNKNOWN;
1407         pl->phy_state.duplex = DUPLEX_UNKNOWN;
1408         linkmode_copy(pl->supported, supported);
1409         linkmode_copy(pl->link_config.advertising, config.advertising);
1410
1411         /* Restrict the phy advertisement according to the MAC support. */
1412         linkmode_copy(phy->advertising, config.advertising);
1413         mutex_unlock(&pl->state_mutex);
1414         mutex_unlock(&phy->lock);
1415
1416         phylink_dbg(pl,
1417                     "phy: %s setting supported %*pb advertising %*pb\n",
1418                     phy_modes(interface),
1419                     __ETHTOOL_LINK_MODE_MASK_NBITS, pl->supported,
1420                     __ETHTOOL_LINK_MODE_MASK_NBITS, phy->advertising);
1421
1422         if (phy_interrupt_is_valid(phy))
1423                 phy_request_interrupt(phy);
1424
1425         return 0;
1426 }
1427
1428 static int phylink_attach_phy(struct phylink *pl, struct phy_device *phy,
1429                               phy_interface_t interface)
1430 {
1431         if (WARN_ON(pl->cfg_link_an_mode == MLO_AN_FIXED ||
1432                     (pl->cfg_link_an_mode == MLO_AN_INBAND &&
1433                      phy_interface_mode_is_8023z(interface))))
1434                 return -EINVAL;
1435
1436         if (pl->phydev)
1437                 return -EBUSY;
1438
1439         return phy_attach_direct(pl->netdev, phy, 0, interface);
1440 }
1441
1442 /**
1443  * phylink_connect_phy() - connect a PHY to the phylink instance
1444  * @pl: a pointer to a &struct phylink returned from phylink_create()
1445  * @phy: a pointer to a &struct phy_device.
1446  *
1447  * Connect @phy to the phylink instance specified by @pl by calling
1448  * phy_attach_direct(). Configure the @phy according to the MAC driver's
1449  * capabilities, start the PHYLIB state machine and enable any interrupts
1450  * that the PHY supports.
1451  *
1452  * This updates the phylink's ethtool supported and advertising link mode
1453  * masks.
1454  *
1455  * Returns 0 on success or a negative errno.
1456  */
1457 int phylink_connect_phy(struct phylink *pl, struct phy_device *phy)
1458 {
1459         int ret;
1460
1461         /* Use PHY device/driver interface */
1462         if (pl->link_interface == PHY_INTERFACE_MODE_NA) {
1463                 pl->link_interface = phy->interface;
1464                 pl->link_config.interface = pl->link_interface;
1465         }
1466
1467         ret = phylink_attach_phy(pl, phy, pl->link_interface);
1468         if (ret < 0)
1469                 return ret;
1470
1471         ret = phylink_bringup_phy(pl, phy, pl->link_config.interface);
1472         if (ret)
1473                 phy_detach(phy);
1474
1475         return ret;
1476 }
1477 EXPORT_SYMBOL_GPL(phylink_connect_phy);
1478
1479 /**
1480  * phylink_of_phy_connect() - connect the PHY specified in the DT mode.
1481  * @pl: a pointer to a &struct phylink returned from phylink_create()
1482  * @dn: a pointer to a &struct device_node.
1483  * @flags: PHY-specific flags to communicate to the PHY device driver
1484  *
1485  * Connect the phy specified in the device node @dn to the phylink instance
1486  * specified by @pl. Actions specified in phylink_connect_phy() will be
1487  * performed.
1488  *
1489  * Returns 0 on success or a negative errno.
1490  */
1491 int phylink_of_phy_connect(struct phylink *pl, struct device_node *dn,
1492                            u32 flags)
1493 {
1494         return phylink_fwnode_phy_connect(pl, of_fwnode_handle(dn), flags);
1495 }
1496 EXPORT_SYMBOL_GPL(phylink_of_phy_connect);
1497
1498 /**
1499  * phylink_fwnode_phy_connect() - connect the PHY specified in the fwnode.
1500  * @pl: a pointer to a &struct phylink returned from phylink_create()
1501  * @fwnode: a pointer to a &struct fwnode_handle.
1502  * @flags: PHY-specific flags to communicate to the PHY device driver
1503  *
1504  * Connect the phy specified @fwnode to the phylink instance specified
1505  * by @pl.
1506  *
1507  * Returns 0 on success or a negative errno.
1508  */
1509 int phylink_fwnode_phy_connect(struct phylink *pl,
1510                                struct fwnode_handle *fwnode,
1511                                u32 flags)
1512 {
1513         struct fwnode_handle *phy_fwnode;
1514         struct phy_device *phy_dev;
1515         int ret;
1516
1517         /* Fixed links and 802.3z are handled without needing a PHY */
1518         if (pl->cfg_link_an_mode == MLO_AN_FIXED ||
1519             (pl->cfg_link_an_mode == MLO_AN_INBAND &&
1520              phy_interface_mode_is_8023z(pl->link_interface)))
1521                 return 0;
1522
1523         phy_fwnode = fwnode_get_phy_node(fwnode);
1524         if (IS_ERR(phy_fwnode)) {
1525                 if (pl->cfg_link_an_mode == MLO_AN_PHY)
1526                         return -ENODEV;
1527                 return 0;
1528         }
1529
1530         phy_dev = fwnode_phy_find_device(phy_fwnode);
1531         /* We're done with the phy_node handle */
1532         fwnode_handle_put(phy_fwnode);
1533         if (!phy_dev)
1534                 return -ENODEV;
1535
1536         /* Use PHY device/driver interface */
1537         if (pl->link_interface == PHY_INTERFACE_MODE_NA) {
1538                 pl->link_interface = phy_dev->interface;
1539                 pl->link_config.interface = pl->link_interface;
1540         }
1541
1542         ret = phy_attach_direct(pl->netdev, phy_dev, flags,
1543                                 pl->link_interface);
1544         if (ret) {
1545                 phy_device_free(phy_dev);
1546                 return ret;
1547         }
1548
1549         ret = phylink_bringup_phy(pl, phy_dev, pl->link_config.interface);
1550         if (ret)
1551                 phy_detach(phy_dev);
1552
1553         return ret;
1554 }
1555 EXPORT_SYMBOL_GPL(phylink_fwnode_phy_connect);
1556
1557 /**
1558  * phylink_disconnect_phy() - disconnect any PHY attached to the phylink
1559  *   instance.
1560  * @pl: a pointer to a &struct phylink returned from phylink_create()
1561  *
1562  * Disconnect any current PHY from the phylink instance described by @pl.
1563  */
1564 void phylink_disconnect_phy(struct phylink *pl)
1565 {
1566         struct phy_device *phy;
1567
1568         ASSERT_RTNL();
1569
1570         phy = pl->phydev;
1571         if (phy) {
1572                 mutex_lock(&phy->lock);
1573                 mutex_lock(&pl->state_mutex);
1574                 pl->phydev = NULL;
1575                 mutex_unlock(&pl->state_mutex);
1576                 mutex_unlock(&phy->lock);
1577                 flush_work(&pl->resolve);
1578
1579                 phy_disconnect(phy);
1580         }
1581 }
1582 EXPORT_SYMBOL_GPL(phylink_disconnect_phy);
1583
1584 /**
1585  * phylink_mac_change() - notify phylink of a change in MAC state
1586  * @pl: a pointer to a &struct phylink returned from phylink_create()
1587  * @up: indicates whether the link is currently up.
1588  *
1589  * The MAC driver should call this driver when the state of its link
1590  * changes (eg, link failure, new negotiation results, etc.)
1591  */
1592 void phylink_mac_change(struct phylink *pl, bool up)
1593 {
1594         if (!up)
1595                 pl->mac_link_dropped = true;
1596         phylink_run_resolve(pl);
1597         phylink_dbg(pl, "mac link %s\n", up ? "up" : "down");
1598 }
1599 EXPORT_SYMBOL_GPL(phylink_mac_change);
1600
1601 static irqreturn_t phylink_link_handler(int irq, void *data)
1602 {
1603         struct phylink *pl = data;
1604
1605         phylink_run_resolve(pl);
1606
1607         return IRQ_HANDLED;
1608 }
1609
1610 /**
1611  * phylink_start() - start a phylink instance
1612  * @pl: a pointer to a &struct phylink returned from phylink_create()
1613  *
1614  * Start the phylink instance specified by @pl, configuring the MAC for the
1615  * desired link mode(s) and negotiation style. This should be called from the
1616  * network device driver's &struct net_device_ops ndo_open() method.
1617  */
1618 void phylink_start(struct phylink *pl)
1619 {
1620         bool poll = false;
1621
1622         ASSERT_RTNL();
1623
1624         phylink_info(pl, "configuring for %s/%s link mode\n",
1625                      phylink_an_mode_str(pl->cur_link_an_mode),
1626                      phy_modes(pl->link_config.interface));
1627
1628         /* Always set the carrier off */
1629         if (pl->netdev)
1630                 netif_carrier_off(pl->netdev);
1631
1632         /* Apply the link configuration to the MAC when starting. This allows
1633          * a fixed-link to start with the correct parameters, and also
1634          * ensures that we set the appropriate advertisement for Serdes links.
1635          *
1636          * Restart autonegotiation if using 802.3z to ensure that the link
1637          * parameters are properly negotiated.  This is necessary for DSA
1638          * switches using 802.3z negotiation to ensure they see our modes.
1639          */
1640         phylink_mac_initial_config(pl, true);
1641
1642         phylink_enable_and_run_resolve(pl, PHYLINK_DISABLE_STOPPED);
1643
1644         if (pl->cfg_link_an_mode == MLO_AN_FIXED && pl->link_gpio) {
1645                 int irq = gpiod_to_irq(pl->link_gpio);
1646
1647                 if (irq > 0) {
1648                         if (!request_irq(irq, phylink_link_handler,
1649                                          IRQF_TRIGGER_RISING |
1650                                          IRQF_TRIGGER_FALLING,
1651                                          "netdev link", pl))
1652                                 pl->link_irq = irq;
1653                         else
1654                                 irq = 0;
1655                 }
1656                 if (irq <= 0)
1657                         poll = true;
1658         }
1659
1660         switch (pl->cfg_link_an_mode) {
1661         case MLO_AN_FIXED:
1662                 poll |= pl->config->poll_fixed_state;
1663                 break;
1664         case MLO_AN_INBAND:
1665                 if (pl->pcs)
1666                         poll |= pl->pcs->poll;
1667                 break;
1668         }
1669         if (poll)
1670                 mod_timer(&pl->link_poll, jiffies + HZ);
1671         if (pl->phydev)
1672                 phy_start(pl->phydev);
1673         if (pl->sfp_bus)
1674                 sfp_upstream_start(pl->sfp_bus);
1675 }
1676 EXPORT_SYMBOL_GPL(phylink_start);
1677
1678 /**
1679  * phylink_stop() - stop a phylink instance
1680  * @pl: a pointer to a &struct phylink returned from phylink_create()
1681  *
1682  * Stop the phylink instance specified by @pl. This should be called from the
1683  * network device driver's &struct net_device_ops ndo_stop() method.  The
1684  * network device's carrier state should not be changed prior to calling this
1685  * function.
1686  *
1687  * This will synchronously bring down the link if the link is not already
1688  * down (in other words, it will trigger a mac_link_down() method call.)
1689  */
1690 void phylink_stop(struct phylink *pl)
1691 {
1692         ASSERT_RTNL();
1693
1694         if (pl->sfp_bus)
1695                 sfp_upstream_stop(pl->sfp_bus);
1696         if (pl->phydev)
1697                 phy_stop(pl->phydev);
1698         del_timer_sync(&pl->link_poll);
1699         if (pl->link_irq) {
1700                 free_irq(pl->link_irq, pl);
1701                 pl->link_irq = 0;
1702         }
1703
1704         phylink_run_resolve_and_disable(pl, PHYLINK_DISABLE_STOPPED);
1705 }
1706 EXPORT_SYMBOL_GPL(phylink_stop);
1707
1708 /**
1709  * phylink_suspend() - handle a network device suspend event
1710  * @pl: a pointer to a &struct phylink returned from phylink_create()
1711  * @mac_wol: true if the MAC needs to receive packets for Wake-on-Lan
1712  *
1713  * Handle a network device suspend event. There are several cases:
1714  *
1715  * - If Wake-on-Lan is not active, we can bring down the link between
1716  *   the MAC and PHY by calling phylink_stop().
1717  * - If Wake-on-Lan is active, and being handled only by the PHY, we
1718  *   can also bring down the link between the MAC and PHY.
1719  * - If Wake-on-Lan is active, but being handled by the MAC, the MAC
1720  *   still needs to receive packets, so we can not bring the link down.
1721  */
1722 void phylink_suspend(struct phylink *pl, bool mac_wol)
1723 {
1724         ASSERT_RTNL();
1725
1726         if (mac_wol && (!pl->netdev || pl->netdev->wol_enabled)) {
1727                 /* Wake-on-Lan enabled, MAC handling */
1728                 mutex_lock(&pl->state_mutex);
1729
1730                 /* Stop the resolver bringing the link up */
1731                 __set_bit(PHYLINK_DISABLE_MAC_WOL, &pl->phylink_disable_state);
1732
1733                 /* Disable the carrier, to prevent transmit timeouts,
1734                  * but one would hope all packets have been sent. This
1735                  * also means phylink_resolve() will do nothing.
1736                  */
1737                 if (pl->netdev)
1738                         netif_carrier_off(pl->netdev);
1739                 else
1740                         pl->old_link_state = false;
1741
1742                 /* We do not call mac_link_down() here as we want the
1743                  * link to remain up to receive the WoL packets.
1744                  */
1745                 mutex_unlock(&pl->state_mutex);
1746         } else {
1747                 phylink_stop(pl);
1748         }
1749 }
1750 EXPORT_SYMBOL_GPL(phylink_suspend);
1751
1752 /**
1753  * phylink_resume() - handle a network device resume event
1754  * @pl: a pointer to a &struct phylink returned from phylink_create()
1755  *
1756  * Undo the effects of phylink_suspend(), returning the link to an
1757  * operational state.
1758  */
1759 void phylink_resume(struct phylink *pl)
1760 {
1761         ASSERT_RTNL();
1762
1763         if (test_bit(PHYLINK_DISABLE_MAC_WOL, &pl->phylink_disable_state)) {
1764                 /* Wake-on-Lan enabled, MAC handling */
1765
1766                 /* Call mac_link_down() so we keep the overall state balanced.
1767                  * Do this under the state_mutex lock for consistency. This
1768                  * will cause a "Link Down" message to be printed during
1769                  * resume, which is harmless - the true link state will be
1770                  * printed when we run a resolve.
1771                  */
1772                 mutex_lock(&pl->state_mutex);
1773                 phylink_link_down(pl);
1774                 mutex_unlock(&pl->state_mutex);
1775
1776                 /* Re-apply the link parameters so that all the settings get
1777                  * restored to the MAC.
1778                  */
1779                 phylink_mac_initial_config(pl, true);
1780
1781                 /* Re-enable and re-resolve the link parameters */
1782                 phylink_enable_and_run_resolve(pl, PHYLINK_DISABLE_MAC_WOL);
1783         } else {
1784                 phylink_start(pl);
1785         }
1786 }
1787 EXPORT_SYMBOL_GPL(phylink_resume);
1788
1789 /**
1790  * phylink_ethtool_get_wol() - get the wake on lan parameters for the PHY
1791  * @pl: a pointer to a &struct phylink returned from phylink_create()
1792  * @wol: a pointer to &struct ethtool_wolinfo to hold the read parameters
1793  *
1794  * Read the wake on lan parameters from the PHY attached to the phylink
1795  * instance specified by @pl. If no PHY is currently attached, report no
1796  * support for wake on lan.
1797  */
1798 void phylink_ethtool_get_wol(struct phylink *pl, struct ethtool_wolinfo *wol)
1799 {
1800         ASSERT_RTNL();
1801
1802         wol->supported = 0;
1803         wol->wolopts = 0;
1804
1805         if (pl->phydev)
1806                 phy_ethtool_get_wol(pl->phydev, wol);
1807 }
1808 EXPORT_SYMBOL_GPL(phylink_ethtool_get_wol);
1809
1810 /**
1811  * phylink_ethtool_set_wol() - set wake on lan parameters
1812  * @pl: a pointer to a &struct phylink returned from phylink_create()
1813  * @wol: a pointer to &struct ethtool_wolinfo for the desired parameters
1814  *
1815  * Set the wake on lan parameters for the PHY attached to the phylink
1816  * instance specified by @pl. If no PHY is attached, returns %EOPNOTSUPP
1817  * error.
1818  *
1819  * Returns zero on success or negative errno code.
1820  */
1821 int phylink_ethtool_set_wol(struct phylink *pl, struct ethtool_wolinfo *wol)
1822 {
1823         int ret = -EOPNOTSUPP;
1824
1825         ASSERT_RTNL();
1826
1827         if (pl->phydev)
1828                 ret = phy_ethtool_set_wol(pl->phydev, wol);
1829
1830         return ret;
1831 }
1832 EXPORT_SYMBOL_GPL(phylink_ethtool_set_wol);
1833
1834 static void phylink_merge_link_mode(unsigned long *dst, const unsigned long *b)
1835 {
1836         __ETHTOOL_DECLARE_LINK_MODE_MASK(mask);
1837
1838         linkmode_zero(mask);
1839         phylink_set_port_modes(mask);
1840
1841         linkmode_and(dst, dst, mask);
1842         linkmode_or(dst, dst, b);
1843 }
1844
1845 static void phylink_get_ksettings(const struct phylink_link_state *state,
1846                                   struct ethtool_link_ksettings *kset)
1847 {
1848         phylink_merge_link_mode(kset->link_modes.advertising, state->advertising);
1849         linkmode_copy(kset->link_modes.lp_advertising, state->lp_advertising);
1850         kset->base.speed = state->speed;
1851         kset->base.duplex = state->duplex;
1852         kset->base.autoneg = state->an_enabled ? AUTONEG_ENABLE :
1853                                 AUTONEG_DISABLE;
1854 }
1855
1856 /**
1857  * phylink_ethtool_ksettings_get() - get the current link settings
1858  * @pl: a pointer to a &struct phylink returned from phylink_create()
1859  * @kset: a pointer to a &struct ethtool_link_ksettings to hold link settings
1860  *
1861  * Read the current link settings for the phylink instance specified by @pl.
1862  * This will be the link settings read from the MAC, PHY or fixed link
1863  * settings depending on the current negotiation mode.
1864  */
1865 int phylink_ethtool_ksettings_get(struct phylink *pl,
1866                                   struct ethtool_link_ksettings *kset)
1867 {
1868         struct phylink_link_state link_state;
1869
1870         ASSERT_RTNL();
1871
1872         if (pl->phydev)
1873                 phy_ethtool_ksettings_get(pl->phydev, kset);
1874         else
1875                 kset->base.port = pl->link_port;
1876
1877         linkmode_copy(kset->link_modes.supported, pl->supported);
1878
1879         switch (pl->cur_link_an_mode) {
1880         case MLO_AN_FIXED:
1881                 /* We are using fixed settings. Report these as the
1882                  * current link settings - and note that these also
1883                  * represent the supported speeds/duplex/pause modes.
1884                  */
1885                 phylink_get_fixed_state(pl, &link_state);
1886                 phylink_get_ksettings(&link_state, kset);
1887                 break;
1888
1889         case MLO_AN_INBAND:
1890                 /* If there is a phy attached, then use the reported
1891                  * settings from the phy with no modification.
1892                  */
1893                 if (pl->phydev)
1894                         break;
1895
1896                 phylink_mac_pcs_get_state(pl, &link_state);
1897
1898                 /* The MAC is reporting the link results from its own PCS
1899                  * layer via in-band status. Report these as the current
1900                  * link settings.
1901                  */
1902                 phylink_get_ksettings(&link_state, kset);
1903                 break;
1904         }
1905
1906         return 0;
1907 }
1908 EXPORT_SYMBOL_GPL(phylink_ethtool_ksettings_get);
1909
1910 /**
1911  * phylink_ethtool_ksettings_set() - set the link settings
1912  * @pl: a pointer to a &struct phylink returned from phylink_create()
1913  * @kset: a pointer to a &struct ethtool_link_ksettings for the desired modes
1914  */
1915 int phylink_ethtool_ksettings_set(struct phylink *pl,
1916                                   const struct ethtool_link_ksettings *kset)
1917 {
1918         __ETHTOOL_DECLARE_LINK_MODE_MASK(support);
1919         struct phylink_link_state config;
1920         const struct phy_setting *s;
1921
1922         ASSERT_RTNL();
1923
1924         if (pl->phydev) {
1925                 /* We can rely on phylib for this update; we also do not need
1926                  * to update the pl->link_config settings:
1927                  * - the configuration returned via ksettings_get() will come
1928                  *   from phylib whenever a PHY is present.
1929                  * - link_config.interface will be updated by the PHY calling
1930                  *   back via phylink_phy_change() and a subsequent resolve.
1931                  * - initial link configuration for PHY mode comes from the
1932                  *   last phy state updated via phylink_phy_change().
1933                  * - other configuration changes (e.g. pause modes) are
1934                  *   performed directly via phylib.
1935                  * - if in in-band mode with a PHY, the link configuration
1936                  *   is passed on the link from the PHY, and all of
1937                  *   link_config.{speed,duplex,an_enabled,pause} are not used.
1938                  * - the only possible use would be link_config.advertising
1939                  *   pause modes when in 1000base-X mode with a PHY, but in
1940                  *   the presence of a PHY, this should not be changed as that
1941                  *   should be determined from the media side advertisement.
1942                  */
1943                 return phy_ethtool_ksettings_set(pl->phydev, kset);
1944         }
1945
1946         config = pl->link_config;
1947
1948         /* Mask out unsupported advertisements */
1949         linkmode_and(config.advertising, kset->link_modes.advertising,
1950                      pl->supported);
1951
1952         /* FIXME: should we reject autoneg if phy/mac does not support it? */
1953         switch (kset->base.autoneg) {
1954         case AUTONEG_DISABLE:
1955                 /* Autonegotiation disabled, select a suitable speed and
1956                  * duplex.
1957                  */
1958                 s = phy_lookup_setting(kset->base.speed, kset->base.duplex,
1959                                        pl->supported, false);
1960                 if (!s)
1961                         return -EINVAL;
1962
1963                 /* If we have a fixed link, refuse to change link parameters.
1964                  * If the link parameters match, accept them but do nothing.
1965                  */
1966                 if (pl->cur_link_an_mode == MLO_AN_FIXED) {
1967                         if (s->speed != pl->link_config.speed ||
1968                             s->duplex != pl->link_config.duplex)
1969                                 return -EINVAL;
1970                         return 0;
1971                 }
1972
1973                 config.speed = s->speed;
1974                 config.duplex = s->duplex;
1975                 break;
1976
1977         case AUTONEG_ENABLE:
1978                 /* If we have a fixed link, allow autonegotiation (since that
1979                  * is our default case) but do not allow the advertisement to
1980                  * be changed. If the advertisement matches, simply return.
1981                  */
1982                 if (pl->cur_link_an_mode == MLO_AN_FIXED) {
1983                         if (!linkmode_equal(config.advertising,
1984                                             pl->link_config.advertising))
1985                                 return -EINVAL;
1986                         return 0;
1987                 }
1988
1989                 config.speed = SPEED_UNKNOWN;
1990                 config.duplex = DUPLEX_UNKNOWN;
1991                 break;
1992
1993         default:
1994                 return -EINVAL;
1995         }
1996
1997         /* We have ruled out the case with a PHY attached, and the
1998          * fixed-link cases.  All that is left are in-band links.
1999          */
2000         config.an_enabled = kset->base.autoneg == AUTONEG_ENABLE;
2001         linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, config.advertising,
2002                          config.an_enabled);
2003
2004         /* If this link is with an SFP, ensure that changes to advertised modes
2005          * also cause the associated interface to be selected such that the
2006          * link can be configured correctly.
2007          */
2008         if (pl->sfp_bus) {
2009                 config.interface = sfp_select_interface(pl->sfp_bus,
2010                                                         config.advertising);
2011                 if (config.interface == PHY_INTERFACE_MODE_NA) {
2012                         phylink_err(pl,
2013                                     "selection of interface failed, advertisement %*pb\n",
2014                                     __ETHTOOL_LINK_MODE_MASK_NBITS,
2015                                     config.advertising);
2016                         return -EINVAL;
2017                 }
2018
2019                 /* Revalidate with the selected interface */
2020                 linkmode_copy(support, pl->supported);
2021                 if (phylink_validate(pl, support, &config)) {
2022                         phylink_err(pl, "validation of %s/%s with support %*pb failed\n",
2023                                     phylink_an_mode_str(pl->cur_link_an_mode),
2024                                     phy_modes(config.interface),
2025                                     __ETHTOOL_LINK_MODE_MASK_NBITS, support);
2026                         return -EINVAL;
2027                 }
2028         } else {
2029                 /* Validate without changing the current supported mask. */
2030                 linkmode_copy(support, pl->supported);
2031                 if (phylink_validate(pl, support, &config))
2032                         return -EINVAL;
2033         }
2034
2035         /* If autonegotiation is enabled, we must have an advertisement */
2036         if (config.an_enabled && phylink_is_empty_linkmode(config.advertising))
2037                 return -EINVAL;
2038
2039         mutex_lock(&pl->state_mutex);
2040         pl->link_config.speed = config.speed;
2041         pl->link_config.duplex = config.duplex;
2042         pl->link_config.an_enabled = config.an_enabled;
2043
2044         if (pl->link_config.interface != config.interface) {
2045                 /* The interface changed, e.g. 1000base-X <-> 2500base-X */
2046                 /* We need to force the link down, then change the interface */
2047                 if (pl->old_link_state) {
2048                         phylink_link_down(pl);
2049                         pl->old_link_state = false;
2050                 }
2051                 if (!test_bit(PHYLINK_DISABLE_STOPPED,
2052                               &pl->phylink_disable_state))
2053                         phylink_major_config(pl, false, &config);
2054                 pl->link_config.interface = config.interface;
2055                 linkmode_copy(pl->link_config.advertising, config.advertising);
2056         } else if (!linkmode_equal(pl->link_config.advertising,
2057                                    config.advertising)) {
2058                 linkmode_copy(pl->link_config.advertising, config.advertising);
2059                 phylink_change_inband_advert(pl);
2060         }
2061         mutex_unlock(&pl->state_mutex);
2062
2063         return 0;
2064 }
2065 EXPORT_SYMBOL_GPL(phylink_ethtool_ksettings_set);
2066
2067 /**
2068  * phylink_ethtool_nway_reset() - restart negotiation
2069  * @pl: a pointer to a &struct phylink returned from phylink_create()
2070  *
2071  * Restart negotiation for the phylink instance specified by @pl. This will
2072  * cause any attached phy to restart negotiation with the link partner, and
2073  * if the MAC is in a BaseX mode, the MAC will also be requested to restart
2074  * negotiation.
2075  *
2076  * Returns zero on success, or negative error code.
2077  */
2078 int phylink_ethtool_nway_reset(struct phylink *pl)
2079 {
2080         int ret = 0;
2081
2082         ASSERT_RTNL();
2083
2084         if (pl->phydev)
2085                 ret = phy_restart_aneg(pl->phydev);
2086         phylink_mac_pcs_an_restart(pl);
2087
2088         return ret;
2089 }
2090 EXPORT_SYMBOL_GPL(phylink_ethtool_nway_reset);
2091
2092 /**
2093  * phylink_ethtool_get_pauseparam() - get the current pause parameters
2094  * @pl: a pointer to a &struct phylink returned from phylink_create()
2095  * @pause: a pointer to a &struct ethtool_pauseparam
2096  */
2097 void phylink_ethtool_get_pauseparam(struct phylink *pl,
2098                                     struct ethtool_pauseparam *pause)
2099 {
2100         ASSERT_RTNL();
2101
2102         pause->autoneg = !!(pl->link_config.pause & MLO_PAUSE_AN);
2103         pause->rx_pause = !!(pl->link_config.pause & MLO_PAUSE_RX);
2104         pause->tx_pause = !!(pl->link_config.pause & MLO_PAUSE_TX);
2105 }
2106 EXPORT_SYMBOL_GPL(phylink_ethtool_get_pauseparam);
2107
2108 /**
2109  * phylink_ethtool_set_pauseparam() - set the current pause parameters
2110  * @pl: a pointer to a &struct phylink returned from phylink_create()
2111  * @pause: a pointer to a &struct ethtool_pauseparam
2112  */
2113 int phylink_ethtool_set_pauseparam(struct phylink *pl,
2114                                    struct ethtool_pauseparam *pause)
2115 {
2116         struct phylink_link_state *config = &pl->link_config;
2117         bool manual_changed;
2118         int pause_state;
2119
2120         ASSERT_RTNL();
2121
2122         if (pl->cur_link_an_mode == MLO_AN_FIXED)
2123                 return -EOPNOTSUPP;
2124
2125         if (!phylink_test(pl->supported, Pause) &&
2126             !phylink_test(pl->supported, Asym_Pause))
2127                 return -EOPNOTSUPP;
2128
2129         if (!phylink_test(pl->supported, Asym_Pause) &&
2130             pause->rx_pause != pause->tx_pause)
2131                 return -EINVAL;
2132
2133         pause_state = 0;
2134         if (pause->autoneg)
2135                 pause_state |= MLO_PAUSE_AN;
2136         if (pause->rx_pause)
2137                 pause_state |= MLO_PAUSE_RX;
2138         if (pause->tx_pause)
2139                 pause_state |= MLO_PAUSE_TX;
2140
2141         mutex_lock(&pl->state_mutex);
2142         /*
2143          * See the comments for linkmode_set_pause(), wrt the deficiencies
2144          * with the current implementation.  A solution to this issue would
2145          * be:
2146          * ethtool  Local device
2147          *  rx  tx  Pause AsymDir
2148          *  0   0   0     0
2149          *  1   0   1     1
2150          *  0   1   0     1
2151          *  1   1   1     1
2152          * and then use the ethtool rx/tx enablement status to mask the
2153          * rx/tx pause resolution.
2154          */
2155         linkmode_set_pause(config->advertising, pause->tx_pause,
2156                            pause->rx_pause);
2157
2158         manual_changed = (config->pause ^ pause_state) & MLO_PAUSE_AN ||
2159                          (!(pause_state & MLO_PAUSE_AN) &&
2160                            (config->pause ^ pause_state) & MLO_PAUSE_TXRX_MASK);
2161
2162         config->pause = pause_state;
2163
2164         /* Update our in-band advertisement, triggering a renegotiation if
2165          * the advertisement changed.
2166          */
2167         if (!pl->phydev)
2168                 phylink_change_inband_advert(pl);
2169
2170         mutex_unlock(&pl->state_mutex);
2171
2172         /* If we have a PHY, a change of the pause frame advertisement will
2173          * cause phylib to renegotiate (if AN is enabled) which will in turn
2174          * call our phylink_phy_change() and trigger a resolve.  Note that
2175          * we can't hold our state mutex while calling phy_set_asym_pause().
2176          */
2177         if (pl->phydev)
2178                 phy_set_asym_pause(pl->phydev, pause->rx_pause,
2179                                    pause->tx_pause);
2180
2181         /* If the manual pause settings changed, make sure we trigger a
2182          * resolve to update their state; we can not guarantee that the
2183          * link will cycle.
2184          */
2185         if (manual_changed) {
2186                 pl->mac_link_dropped = true;
2187                 phylink_run_resolve(pl);
2188         }
2189
2190         return 0;
2191 }
2192 EXPORT_SYMBOL_GPL(phylink_ethtool_set_pauseparam);
2193
2194 /**
2195  * phylink_get_eee_err() - read the energy efficient ethernet error
2196  *   counter
2197  * @pl: a pointer to a &struct phylink returned from phylink_create().
2198  *
2199  * Read the Energy Efficient Ethernet error counter from the PHY associated
2200  * with the phylink instance specified by @pl.
2201  *
2202  * Returns positive error counter value, or negative error code.
2203  */
2204 int phylink_get_eee_err(struct phylink *pl)
2205 {
2206         int ret = 0;
2207
2208         ASSERT_RTNL();
2209
2210         if (pl->phydev)
2211                 ret = phy_get_eee_err(pl->phydev);
2212
2213         return ret;
2214 }
2215 EXPORT_SYMBOL_GPL(phylink_get_eee_err);
2216
2217 /**
2218  * phylink_init_eee() - init and check the EEE features
2219  * @pl: a pointer to a &struct phylink returned from phylink_create()
2220  * @clk_stop_enable: allow PHY to stop receive clock
2221  *
2222  * Must be called either with RTNL held or within mac_link_up()
2223  */
2224 int phylink_init_eee(struct phylink *pl, bool clk_stop_enable)
2225 {
2226         int ret = -EOPNOTSUPP;
2227
2228         if (pl->phydev)
2229                 ret = phy_init_eee(pl->phydev, clk_stop_enable);
2230
2231         return ret;
2232 }
2233 EXPORT_SYMBOL_GPL(phylink_init_eee);
2234
2235 /**
2236  * phylink_ethtool_get_eee() - read the energy efficient ethernet parameters
2237  * @pl: a pointer to a &struct phylink returned from phylink_create()
2238  * @eee: a pointer to a &struct ethtool_eee for the read parameters
2239  */
2240 int phylink_ethtool_get_eee(struct phylink *pl, struct ethtool_eee *eee)
2241 {
2242         int ret = -EOPNOTSUPP;
2243
2244         ASSERT_RTNL();
2245
2246         if (pl->phydev)
2247                 ret = phy_ethtool_get_eee(pl->phydev, eee);
2248
2249         return ret;
2250 }
2251 EXPORT_SYMBOL_GPL(phylink_ethtool_get_eee);
2252
2253 /**
2254  * phylink_ethtool_set_eee() - set the energy efficient ethernet parameters
2255  * @pl: a pointer to a &struct phylink returned from phylink_create()
2256  * @eee: a pointer to a &struct ethtool_eee for the desired parameters
2257  */
2258 int phylink_ethtool_set_eee(struct phylink *pl, struct ethtool_eee *eee)
2259 {
2260         int ret = -EOPNOTSUPP;
2261
2262         ASSERT_RTNL();
2263
2264         if (pl->phydev)
2265                 ret = phy_ethtool_set_eee(pl->phydev, eee);
2266
2267         return ret;
2268 }
2269 EXPORT_SYMBOL_GPL(phylink_ethtool_set_eee);
2270
2271 /* This emulates MII registers for a fixed-mode phy operating as per the
2272  * passed in state. "aneg" defines if we report negotiation is possible.
2273  *
2274  * FIXME: should deal with negotiation state too.
2275  */
2276 static int phylink_mii_emul_read(unsigned int reg,
2277                                  struct phylink_link_state *state)
2278 {
2279         struct fixed_phy_status fs;
2280         unsigned long *lpa = state->lp_advertising;
2281         int val;
2282
2283         fs.link = state->link;
2284         fs.speed = state->speed;
2285         fs.duplex = state->duplex;
2286         fs.pause = test_bit(ETHTOOL_LINK_MODE_Pause_BIT, lpa);
2287         fs.asym_pause = test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, lpa);
2288
2289         val = swphy_read_reg(reg, &fs);
2290         if (reg == MII_BMSR) {
2291                 if (!state->an_complete)
2292                         val &= ~BMSR_ANEGCOMPLETE;
2293         }
2294         return val;
2295 }
2296
2297 static int phylink_phy_read(struct phylink *pl, unsigned int phy_id,
2298                             unsigned int reg)
2299 {
2300         struct phy_device *phydev = pl->phydev;
2301         int prtad, devad;
2302
2303         if (mdio_phy_id_is_c45(phy_id)) {
2304                 prtad = mdio_phy_id_prtad(phy_id);
2305                 devad = mdio_phy_id_devad(phy_id);
2306                 return mdiobus_c45_read(pl->phydev->mdio.bus, prtad, devad,
2307                                         reg);
2308         }
2309
2310         if (phydev->is_c45) {
2311                 switch (reg) {
2312                 case MII_BMCR:
2313                 case MII_BMSR:
2314                 case MII_PHYSID1:
2315                 case MII_PHYSID2:
2316                         devad = __ffs(phydev->c45_ids.mmds_present);
2317                         break;
2318                 case MII_ADVERTISE:
2319                 case MII_LPA:
2320                         if (!(phydev->c45_ids.mmds_present & MDIO_DEVS_AN))
2321                                 return -EINVAL;
2322                         devad = MDIO_MMD_AN;
2323                         if (reg == MII_ADVERTISE)
2324                                 reg = MDIO_AN_ADVERTISE;
2325                         else
2326                                 reg = MDIO_AN_LPA;
2327                         break;
2328                 default:
2329                         return -EINVAL;
2330                 }
2331                 prtad = phy_id;
2332                 return mdiobus_c45_read(pl->phydev->mdio.bus, prtad, devad,
2333                                         reg);
2334         }
2335
2336         return mdiobus_read(pl->phydev->mdio.bus, phy_id, reg);
2337 }
2338
2339 static int phylink_phy_write(struct phylink *pl, unsigned int phy_id,
2340                              unsigned int reg, unsigned int val)
2341 {
2342         struct phy_device *phydev = pl->phydev;
2343         int prtad, devad;
2344
2345         if (mdio_phy_id_is_c45(phy_id)) {
2346                 prtad = mdio_phy_id_prtad(phy_id);
2347                 devad = mdio_phy_id_devad(phy_id);
2348                 return mdiobus_c45_write(pl->phydev->mdio.bus, prtad, devad,
2349                                          reg, val);
2350         }
2351
2352         if (phydev->is_c45) {
2353                 switch (reg) {
2354                 case MII_BMCR:
2355                 case MII_BMSR:
2356                 case MII_PHYSID1:
2357                 case MII_PHYSID2:
2358                         devad = __ffs(phydev->c45_ids.mmds_present);
2359                         break;
2360                 case MII_ADVERTISE:
2361                 case MII_LPA:
2362                         if (!(phydev->c45_ids.mmds_present & MDIO_DEVS_AN))
2363                                 return -EINVAL;
2364                         devad = MDIO_MMD_AN;
2365                         if (reg == MII_ADVERTISE)
2366                                 reg = MDIO_AN_ADVERTISE;
2367                         else
2368                                 reg = MDIO_AN_LPA;
2369                         break;
2370                 default:
2371                         return -EINVAL;
2372                 }
2373                 return mdiobus_c45_write(pl->phydev->mdio.bus, phy_id, devad,
2374                                          reg, val);
2375         }
2376
2377         return mdiobus_write(phydev->mdio.bus, phy_id, reg, val);
2378 }
2379
2380 static int phylink_mii_read(struct phylink *pl, unsigned int phy_id,
2381                             unsigned int reg)
2382 {
2383         struct phylink_link_state state;
2384         int val = 0xffff;
2385
2386         switch (pl->cur_link_an_mode) {
2387         case MLO_AN_FIXED:
2388                 if (phy_id == 0) {
2389                         phylink_get_fixed_state(pl, &state);
2390                         val = phylink_mii_emul_read(reg, &state);
2391                 }
2392                 break;
2393
2394         case MLO_AN_PHY:
2395                 return -EOPNOTSUPP;
2396
2397         case MLO_AN_INBAND:
2398                 if (phy_id == 0) {
2399                         phylink_mac_pcs_get_state(pl, &state);
2400                         val = phylink_mii_emul_read(reg, &state);
2401                 }
2402                 break;
2403         }
2404
2405         return val & 0xffff;
2406 }
2407
2408 static int phylink_mii_write(struct phylink *pl, unsigned int phy_id,
2409                              unsigned int reg, unsigned int val)
2410 {
2411         switch (pl->cur_link_an_mode) {
2412         case MLO_AN_FIXED:
2413                 break;
2414
2415         case MLO_AN_PHY:
2416                 return -EOPNOTSUPP;
2417
2418         case MLO_AN_INBAND:
2419                 break;
2420         }
2421
2422         return 0;
2423 }
2424
2425 /**
2426  * phylink_mii_ioctl() - generic mii ioctl interface
2427  * @pl: a pointer to a &struct phylink returned from phylink_create()
2428  * @ifr: a pointer to a &struct ifreq for socket ioctls
2429  * @cmd: ioctl cmd to execute
2430  *
2431  * Perform the specified MII ioctl on the PHY attached to the phylink instance
2432  * specified by @pl. If no PHY is attached, emulate the presence of the PHY.
2433  *
2434  * Returns: zero on success or negative error code.
2435  *
2436  * %SIOCGMIIPHY:
2437  *  read register from the current PHY.
2438  * %SIOCGMIIREG:
2439  *  read register from the specified PHY.
2440  * %SIOCSMIIREG:
2441  *  set a register on the specified PHY.
2442  */
2443 int phylink_mii_ioctl(struct phylink *pl, struct ifreq *ifr, int cmd)
2444 {
2445         struct mii_ioctl_data *mii = if_mii(ifr);
2446         int  ret;
2447
2448         ASSERT_RTNL();
2449
2450         if (pl->phydev) {
2451                 /* PHYs only exist for MLO_AN_PHY and SGMII */
2452                 switch (cmd) {
2453                 case SIOCGMIIPHY:
2454                         mii->phy_id = pl->phydev->mdio.addr;
2455                         fallthrough;
2456
2457                 case SIOCGMIIREG:
2458                         ret = phylink_phy_read(pl, mii->phy_id, mii->reg_num);
2459                         if (ret >= 0) {
2460                                 mii->val_out = ret;
2461                                 ret = 0;
2462                         }
2463                         break;
2464
2465                 case SIOCSMIIREG:
2466                         ret = phylink_phy_write(pl, mii->phy_id, mii->reg_num,
2467                                                 mii->val_in);
2468                         break;
2469
2470                 default:
2471                         ret = phy_mii_ioctl(pl->phydev, ifr, cmd);
2472                         break;
2473                 }
2474         } else {
2475                 switch (cmd) {
2476                 case SIOCGMIIPHY:
2477                         mii->phy_id = 0;
2478                         fallthrough;
2479
2480                 case SIOCGMIIREG:
2481                         ret = phylink_mii_read(pl, mii->phy_id, mii->reg_num);
2482                         if (ret >= 0) {
2483                                 mii->val_out = ret;
2484                                 ret = 0;
2485                         }
2486                         break;
2487
2488                 case SIOCSMIIREG:
2489                         ret = phylink_mii_write(pl, mii->phy_id, mii->reg_num,
2490                                                 mii->val_in);
2491                         break;
2492
2493                 default:
2494                         ret = -EOPNOTSUPP;
2495                         break;
2496                 }
2497         }
2498
2499         return ret;
2500 }
2501 EXPORT_SYMBOL_GPL(phylink_mii_ioctl);
2502
2503 /**
2504  * phylink_speed_down() - set the non-SFP PHY to lowest speed supported by both
2505  *   link partners
2506  * @pl: a pointer to a &struct phylink returned from phylink_create()
2507  * @sync: perform action synchronously
2508  *
2509  * If we have a PHY that is not part of a SFP module, then set the speed
2510  * as described in the phy_speed_down() function. Please see this function
2511  * for a description of the @sync parameter.
2512  *
2513  * Returns zero if there is no PHY, otherwise as per phy_speed_down().
2514  */
2515 int phylink_speed_down(struct phylink *pl, bool sync)
2516 {
2517         int ret = 0;
2518
2519         ASSERT_RTNL();
2520
2521         if (!pl->sfp_bus && pl->phydev)
2522                 ret = phy_speed_down(pl->phydev, sync);
2523
2524         return ret;
2525 }
2526 EXPORT_SYMBOL_GPL(phylink_speed_down);
2527
2528 /**
2529  * phylink_speed_up() - restore the advertised speeds prior to the call to
2530  *   phylink_speed_down()
2531  * @pl: a pointer to a &struct phylink returned from phylink_create()
2532  *
2533  * If we have a PHY that is not part of a SFP module, then restore the
2534  * PHY speeds as per phy_speed_up().
2535  *
2536  * Returns zero if there is no PHY, otherwise as per phy_speed_up().
2537  */
2538 int phylink_speed_up(struct phylink *pl)
2539 {
2540         int ret = 0;
2541
2542         ASSERT_RTNL();
2543
2544         if (!pl->sfp_bus && pl->phydev)
2545                 ret = phy_speed_up(pl->phydev);
2546
2547         return ret;
2548 }
2549 EXPORT_SYMBOL_GPL(phylink_speed_up);
2550
2551 static void phylink_sfp_attach(void *upstream, struct sfp_bus *bus)
2552 {
2553         struct phylink *pl = upstream;
2554
2555         pl->netdev->sfp_bus = bus;
2556 }
2557
2558 static void phylink_sfp_detach(void *upstream, struct sfp_bus *bus)
2559 {
2560         struct phylink *pl = upstream;
2561
2562         pl->netdev->sfp_bus = NULL;
2563 }
2564
2565 static int phylink_sfp_config(struct phylink *pl, u8 mode,
2566                               const unsigned long *supported,
2567                               const unsigned long *advertising)
2568 {
2569         __ETHTOOL_DECLARE_LINK_MODE_MASK(support1);
2570         __ETHTOOL_DECLARE_LINK_MODE_MASK(support);
2571         struct phylink_link_state config;
2572         phy_interface_t iface;
2573         bool changed;
2574         int ret;
2575
2576         linkmode_copy(support, supported);
2577
2578         memset(&config, 0, sizeof(config));
2579         linkmode_copy(config.advertising, advertising);
2580         config.interface = PHY_INTERFACE_MODE_NA;
2581         config.speed = SPEED_UNKNOWN;
2582         config.duplex = DUPLEX_UNKNOWN;
2583         config.pause = MLO_PAUSE_AN;
2584         config.an_enabled = pl->link_config.an_enabled;
2585
2586         /* Ignore errors if we're expecting a PHY to attach later */
2587         ret = phylink_validate(pl, support, &config);
2588         if (ret) {
2589                 phylink_err(pl, "validation with support %*pb failed: %pe\n",
2590                             __ETHTOOL_LINK_MODE_MASK_NBITS, support,
2591                             ERR_PTR(ret));
2592                 return ret;
2593         }
2594
2595         iface = sfp_select_interface(pl->sfp_bus, config.advertising);
2596         if (iface == PHY_INTERFACE_MODE_NA) {
2597                 phylink_err(pl,
2598                             "selection of interface failed, advertisement %*pb\n",
2599                             __ETHTOOL_LINK_MODE_MASK_NBITS, config.advertising);
2600                 return -EINVAL;
2601         }
2602
2603         config.interface = iface;
2604         linkmode_copy(support1, support);
2605         ret = phylink_validate(pl, support1, &config);
2606         if (ret) {
2607                 phylink_err(pl,
2608                             "validation of %s/%s with support %*pb failed: %pe\n",
2609                             phylink_an_mode_str(mode),
2610                             phy_modes(config.interface),
2611                             __ETHTOOL_LINK_MODE_MASK_NBITS, support,
2612                             ERR_PTR(ret));
2613                 return ret;
2614         }
2615
2616         phylink_dbg(pl, "requesting link mode %s/%s with support %*pb\n",
2617                     phylink_an_mode_str(mode), phy_modes(config.interface),
2618                     __ETHTOOL_LINK_MODE_MASK_NBITS, support);
2619
2620         if (phy_interface_mode_is_8023z(iface) && pl->phydev)
2621                 return -EINVAL;
2622
2623         changed = !linkmode_equal(pl->supported, support) ||
2624                   !linkmode_equal(pl->link_config.advertising,
2625                                   config.advertising);
2626         if (changed) {
2627                 linkmode_copy(pl->supported, support);
2628                 linkmode_copy(pl->link_config.advertising, config.advertising);
2629         }
2630
2631         if (pl->cur_link_an_mode != mode ||
2632             pl->link_config.interface != config.interface) {
2633                 pl->link_config.interface = config.interface;
2634                 pl->cur_link_an_mode = mode;
2635
2636                 changed = true;
2637
2638                 phylink_info(pl, "switched to %s/%s link mode\n",
2639                              phylink_an_mode_str(mode),
2640                              phy_modes(config.interface));
2641         }
2642
2643         pl->link_port = pl->sfp_port;
2644
2645         if (changed && !test_bit(PHYLINK_DISABLE_STOPPED,
2646                                  &pl->phylink_disable_state))
2647                 phylink_mac_initial_config(pl, false);
2648
2649         return ret;
2650 }
2651
2652 static int phylink_sfp_module_insert(void *upstream,
2653                                      const struct sfp_eeprom_id *id)
2654 {
2655         struct phylink *pl = upstream;
2656         unsigned long *support = pl->sfp_support;
2657
2658         ASSERT_RTNL();
2659
2660         linkmode_zero(support);
2661         sfp_parse_support(pl->sfp_bus, id, support);
2662         pl->sfp_port = sfp_parse_port(pl->sfp_bus, id, support);
2663
2664         /* If this module may have a PHY connecting later, defer until later */
2665         pl->sfp_may_have_phy = sfp_may_have_phy(pl->sfp_bus, id);
2666         if (pl->sfp_may_have_phy)
2667                 return 0;
2668
2669         return phylink_sfp_config(pl, MLO_AN_INBAND, support, support);
2670 }
2671
2672 static int phylink_sfp_module_start(void *upstream)
2673 {
2674         struct phylink *pl = upstream;
2675
2676         /* If this SFP module has a PHY, start the PHY now. */
2677         if (pl->phydev) {
2678                 phy_start(pl->phydev);
2679                 return 0;
2680         }
2681
2682         /* If the module may have a PHY but we didn't detect one we
2683          * need to configure the MAC here.
2684          */
2685         if (!pl->sfp_may_have_phy)
2686                 return 0;
2687
2688         return phylink_sfp_config(pl, MLO_AN_INBAND,
2689                                   pl->sfp_support, pl->sfp_support);
2690 }
2691
2692 static void phylink_sfp_module_stop(void *upstream)
2693 {
2694         struct phylink *pl = upstream;
2695
2696         /* If this SFP module has a PHY, stop it. */
2697         if (pl->phydev)
2698                 phy_stop(pl->phydev);
2699 }
2700
2701 static void phylink_sfp_link_down(void *upstream)
2702 {
2703         struct phylink *pl = upstream;
2704
2705         ASSERT_RTNL();
2706
2707         phylink_run_resolve_and_disable(pl, PHYLINK_DISABLE_LINK);
2708 }
2709
2710 static void phylink_sfp_link_up(void *upstream)
2711 {
2712         struct phylink *pl = upstream;
2713
2714         ASSERT_RTNL();
2715
2716         phylink_enable_and_run_resolve(pl, PHYLINK_DISABLE_LINK);
2717 }
2718
2719 /* The Broadcom BCM84881 in the Methode DM7052 is unable to provide a SGMII
2720  * or 802.3z control word, so inband will not work.
2721  */
2722 static bool phylink_phy_no_inband(struct phy_device *phy)
2723 {
2724         return phy->is_c45 &&
2725                 (phy->c45_ids.device_ids[1] & 0xfffffff0) == 0xae025150;
2726 }
2727
2728 static int phylink_sfp_connect_phy(void *upstream, struct phy_device *phy)
2729 {
2730         struct phylink *pl = upstream;
2731         phy_interface_t interface;
2732         u8 mode;
2733         int ret;
2734
2735         /*
2736          * This is the new way of dealing with flow control for PHYs,
2737          * as described by Timur Tabi in commit 529ed1275263 ("net: phy:
2738          * phy drivers should not set SUPPORTED_[Asym_]Pause") except
2739          * using our validate call to the MAC, we rely upon the MAC
2740          * clearing the bits from both supported and advertising fields.
2741          */
2742         phy_support_asym_pause(phy);
2743
2744         if (phylink_phy_no_inband(phy))
2745                 mode = MLO_AN_PHY;
2746         else
2747                 mode = MLO_AN_INBAND;
2748
2749         /* Do the initial configuration */
2750         ret = phylink_sfp_config(pl, mode, phy->supported, phy->advertising);
2751         if (ret < 0)
2752                 return ret;
2753
2754         interface = pl->link_config.interface;
2755         ret = phylink_attach_phy(pl, phy, interface);
2756         if (ret < 0)
2757                 return ret;
2758
2759         ret = phylink_bringup_phy(pl, phy, interface);
2760         if (ret)
2761                 phy_detach(phy);
2762
2763         return ret;
2764 }
2765
2766 static void phylink_sfp_disconnect_phy(void *upstream)
2767 {
2768         phylink_disconnect_phy(upstream);
2769 }
2770
2771 static const struct sfp_upstream_ops sfp_phylink_ops = {
2772         .attach = phylink_sfp_attach,
2773         .detach = phylink_sfp_detach,
2774         .module_insert = phylink_sfp_module_insert,
2775         .module_start = phylink_sfp_module_start,
2776         .module_stop = phylink_sfp_module_stop,
2777         .link_up = phylink_sfp_link_up,
2778         .link_down = phylink_sfp_link_down,
2779         .connect_phy = phylink_sfp_connect_phy,
2780         .disconnect_phy = phylink_sfp_disconnect_phy,
2781 };
2782
2783 /* Helpers for MAC drivers */
2784
2785 static void phylink_decode_c37_word(struct phylink_link_state *state,
2786                                     uint16_t config_reg, int speed)
2787 {
2788         bool tx_pause, rx_pause;
2789         int fd_bit;
2790
2791         if (speed == SPEED_2500)
2792                 fd_bit = ETHTOOL_LINK_MODE_2500baseX_Full_BIT;
2793         else
2794                 fd_bit = ETHTOOL_LINK_MODE_1000baseX_Full_BIT;
2795
2796         mii_lpa_mod_linkmode_x(state->lp_advertising, config_reg, fd_bit);
2797
2798         if (linkmode_test_bit(fd_bit, state->advertising) &&
2799             linkmode_test_bit(fd_bit, state->lp_advertising)) {
2800                 state->speed = speed;
2801                 state->duplex = DUPLEX_FULL;
2802         } else {
2803                 /* negotiation failure */
2804                 state->link = false;
2805         }
2806
2807         linkmode_resolve_pause(state->advertising, state->lp_advertising,
2808                                &tx_pause, &rx_pause);
2809
2810         if (tx_pause)
2811                 state->pause |= MLO_PAUSE_TX;
2812         if (rx_pause)
2813                 state->pause |= MLO_PAUSE_RX;
2814 }
2815
2816 static void phylink_decode_sgmii_word(struct phylink_link_state *state,
2817                                       uint16_t config_reg)
2818 {
2819         if (!(config_reg & LPA_SGMII_LINK)) {
2820                 state->link = false;
2821                 return;
2822         }
2823
2824         switch (config_reg & LPA_SGMII_SPD_MASK) {
2825         case LPA_SGMII_10:
2826                 state->speed = SPEED_10;
2827                 break;
2828         case LPA_SGMII_100:
2829                 state->speed = SPEED_100;
2830                 break;
2831         case LPA_SGMII_1000:
2832                 state->speed = SPEED_1000;
2833                 break;
2834         default:
2835                 state->link = false;
2836                 return;
2837         }
2838         if (config_reg & LPA_SGMII_FULL_DUPLEX)
2839                 state->duplex = DUPLEX_FULL;
2840         else
2841                 state->duplex = DUPLEX_HALF;
2842 }
2843
2844 /**
2845  * phylink_decode_usxgmii_word() - decode the USXGMII word from a MAC PCS
2846  * @state: a pointer to a struct phylink_link_state.
2847  * @lpa: a 16 bit value which stores the USXGMII auto-negotiation word
2848  *
2849  * Helper for MAC PCS supporting the USXGMII protocol and the auto-negotiation
2850  * code word.  Decode the USXGMII code word and populate the corresponding fields
2851  * (speed, duplex) into the phylink_link_state structure.
2852  */
2853 void phylink_decode_usxgmii_word(struct phylink_link_state *state,
2854                                  uint16_t lpa)
2855 {
2856         switch (lpa & MDIO_USXGMII_SPD_MASK) {
2857         case MDIO_USXGMII_10:
2858                 state->speed = SPEED_10;
2859                 break;
2860         case MDIO_USXGMII_100:
2861                 state->speed = SPEED_100;
2862                 break;
2863         case MDIO_USXGMII_1000:
2864                 state->speed = SPEED_1000;
2865                 break;
2866         case MDIO_USXGMII_2500:
2867                 state->speed = SPEED_2500;
2868                 break;
2869         case MDIO_USXGMII_5000:
2870                 state->speed = SPEED_5000;
2871                 break;
2872         case MDIO_USXGMII_10G:
2873                 state->speed = SPEED_10000;
2874                 break;
2875         default:
2876                 state->link = false;
2877                 return;
2878         }
2879
2880         if (lpa & MDIO_USXGMII_FULL_DUPLEX)
2881                 state->duplex = DUPLEX_FULL;
2882         else
2883                 state->duplex = DUPLEX_HALF;
2884 }
2885 EXPORT_SYMBOL_GPL(phylink_decode_usxgmii_word);
2886
2887 /**
2888  * phylink_mii_c22_pcs_decode_state() - Decode MAC PCS state from MII registers
2889  * @state: a pointer to a &struct phylink_link_state.
2890  * @bmsr: The value of the %MII_BMSR register
2891  * @lpa: The value of the %MII_LPA register
2892  *
2893  * Helper for MAC PCS supporting the 802.3 clause 22 register set for
2894  * clause 37 negotiation and/or SGMII control.
2895  *
2896  * Parse the Clause 37 or Cisco SGMII link partner negotiation word into
2897  * the phylink @state structure. This is suitable to be used for implementing
2898  * the mac_pcs_get_state() member of the struct phylink_mac_ops structure if
2899  * accessing @bmsr and @lpa cannot be done with MDIO directly.
2900  */
2901 void phylink_mii_c22_pcs_decode_state(struct phylink_link_state *state,
2902                                       u16 bmsr, u16 lpa)
2903 {
2904         state->link = !!(bmsr & BMSR_LSTATUS);
2905         state->an_complete = !!(bmsr & BMSR_ANEGCOMPLETE);
2906         /* If there is no link or autonegotiation is disabled, the LP advertisement
2907          * data is not meaningful, so don't go any further.
2908          */
2909         if (!state->link || !state->an_enabled)
2910                 return;
2911
2912         switch (state->interface) {
2913         case PHY_INTERFACE_MODE_1000BASEX:
2914                 phylink_decode_c37_word(state, lpa, SPEED_1000);
2915                 break;
2916
2917         case PHY_INTERFACE_MODE_2500BASEX:
2918                 phylink_decode_c37_word(state, lpa, SPEED_2500);
2919                 break;
2920
2921         case PHY_INTERFACE_MODE_SGMII:
2922         case PHY_INTERFACE_MODE_QSGMII:
2923                 phylink_decode_sgmii_word(state, lpa);
2924                 break;
2925
2926         default:
2927                 state->link = false;
2928                 break;
2929         }
2930 }
2931 EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_decode_state);
2932
2933 /**
2934  * phylink_mii_c22_pcs_get_state() - read the MAC PCS state
2935  * @pcs: a pointer to a &struct mdio_device.
2936  * @state: a pointer to a &struct phylink_link_state.
2937  *
2938  * Helper for MAC PCS supporting the 802.3 clause 22 register set for
2939  * clause 37 negotiation and/or SGMII control.
2940  *
2941  * Read the MAC PCS state from the MII device configured in @config and
2942  * parse the Clause 37 or Cisco SGMII link partner negotiation word into
2943  * the phylink @state structure. This is suitable to be directly plugged
2944  * into the mac_pcs_get_state() member of the struct phylink_mac_ops
2945  * structure.
2946  */
2947 void phylink_mii_c22_pcs_get_state(struct mdio_device *pcs,
2948                                    struct phylink_link_state *state)
2949 {
2950         int bmsr, lpa;
2951
2952         bmsr = mdiodev_read(pcs, MII_BMSR);
2953         lpa = mdiodev_read(pcs, MII_LPA);
2954         if (bmsr < 0 || lpa < 0) {
2955                 state->link = false;
2956                 return;
2957         }
2958
2959         phylink_mii_c22_pcs_decode_state(state, bmsr, lpa);
2960 }
2961 EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_get_state);
2962
2963 /**
2964  * phylink_mii_c22_pcs_encode_advertisement() - configure the clause 37 PCS
2965  *      advertisement
2966  * @interface: the PHY interface mode being configured
2967  * @advertising: the ethtool advertisement mask
2968  *
2969  * Helper for MAC PCS supporting the 802.3 clause 22 register set for
2970  * clause 37 negotiation and/or SGMII control.
2971  *
2972  * Encode the clause 37 PCS advertisement as specified by @interface and
2973  * @advertising.
2974  *
2975  * Return: The new value for @adv, or ``-EINVAL`` if it should not be changed.
2976  */
2977 int phylink_mii_c22_pcs_encode_advertisement(phy_interface_t interface,
2978                                              const unsigned long *advertising)
2979 {
2980         u16 adv;
2981
2982         switch (interface) {
2983         case PHY_INTERFACE_MODE_1000BASEX:
2984         case PHY_INTERFACE_MODE_2500BASEX:
2985                 adv = ADVERTISE_1000XFULL;
2986                 if (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
2987                                       advertising))
2988                         adv |= ADVERTISE_1000XPAUSE;
2989                 if (linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
2990                                       advertising))
2991                         adv |= ADVERTISE_1000XPSE_ASYM;
2992                 return adv;
2993         case PHY_INTERFACE_MODE_SGMII:
2994                 return 0x0001;
2995         default:
2996                 /* Nothing to do for other modes */
2997                 return -EINVAL;
2998         }
2999 }
3000 EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_encode_advertisement);
3001
3002 /**
3003  * phylink_mii_c22_pcs_config() - configure clause 22 PCS
3004  * @pcs: a pointer to a &struct mdio_device.
3005  * @mode: link autonegotiation mode
3006  * @interface: the PHY interface mode being configured
3007  * @advertising: the ethtool advertisement mask
3008  *
3009  * Configure a Clause 22 PCS PHY with the appropriate negotiation
3010  * parameters for the @mode, @interface and @advertising parameters.
3011  * Returns negative error number on failure, zero if the advertisement
3012  * has not changed, or positive if there is a change.
3013  */
3014 int phylink_mii_c22_pcs_config(struct mdio_device *pcs, unsigned int mode,
3015                                phy_interface_t interface,
3016                                const unsigned long *advertising)
3017 {
3018         bool changed = 0;
3019         u16 bmcr;
3020         int ret, adv;
3021
3022         adv = phylink_mii_c22_pcs_encode_advertisement(interface, advertising);
3023         if (adv >= 0) {
3024                 ret = mdiobus_modify_changed(pcs->bus, pcs->addr,
3025                                              MII_ADVERTISE, 0xffff, adv);
3026                 if (ret < 0)
3027                         return ret;
3028                 changed = ret;
3029         }
3030
3031         /* Ensure ISOLATE bit is disabled */
3032         if (mode == MLO_AN_INBAND &&
3033             linkmode_test_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, advertising))
3034                 bmcr = BMCR_ANENABLE;
3035         else
3036                 bmcr = 0;
3037
3038         ret = mdiodev_modify(pcs, MII_BMCR, BMCR_ANENABLE | BMCR_ISOLATE, bmcr);
3039         if (ret < 0)
3040                 return ret;
3041
3042         return changed;
3043 }
3044 EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_config);
3045
3046 /**
3047  * phylink_mii_c22_pcs_an_restart() - restart 802.3z autonegotiation
3048  * @pcs: a pointer to a &struct mdio_device.
3049  *
3050  * Helper for MAC PCS supporting the 802.3 clause 22 register set for
3051  * clause 37 negotiation.
3052  *
3053  * Restart the clause 37 negotiation with the link partner. This is
3054  * suitable to be directly plugged into the mac_pcs_get_state() member
3055  * of the struct phylink_mac_ops structure.
3056  */
3057 void phylink_mii_c22_pcs_an_restart(struct mdio_device *pcs)
3058 {
3059         int val = mdiodev_read(pcs, MII_BMCR);
3060
3061         if (val >= 0) {
3062                 val |= BMCR_ANRESTART;
3063
3064                 mdiodev_write(pcs, MII_BMCR, val);
3065         }
3066 }
3067 EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_an_restart);
3068
3069 void phylink_mii_c45_pcs_get_state(struct mdio_device *pcs,
3070                                    struct phylink_link_state *state)
3071 {
3072         struct mii_bus *bus = pcs->bus;
3073         int addr = pcs->addr;
3074         int stat;
3075
3076         stat = mdiobus_c45_read(bus, addr, MDIO_MMD_PCS, MDIO_STAT1);
3077         if (stat < 0) {
3078                 state->link = false;
3079                 return;
3080         }
3081
3082         state->link = !!(stat & MDIO_STAT1_LSTATUS);
3083         if (!state->link)
3084                 return;
3085
3086         switch (state->interface) {
3087         case PHY_INTERFACE_MODE_10GBASER:
3088                 state->speed = SPEED_10000;
3089                 state->duplex = DUPLEX_FULL;
3090                 break;
3091
3092         default:
3093                 break;
3094         }
3095 }
3096 EXPORT_SYMBOL_GPL(phylink_mii_c45_pcs_get_state);
3097
3098 MODULE_LICENSE("GPL v2");