include/linux/mii.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * linux/mii.h: definitions for MII-compatible transceivers
   4  * Originally drivers/net/sunhme.h.
   5  *
   6  * Copyright (C) 1996, 1999, 2001 David S. Miller (davem@redhat.com)
   7  */
   8 #ifndef __LINUX_MII_H__
   9 #define __LINUX_MII_H__
  10
  11
  12 #include <linux/if.h>
  13 #include <linux/linkmode.h>
  14 #include <uapi/linux/mii.h>
  15
  16 struct ethtool_cmd;
  17
  18 struct mii_if_info {
  19         int phy_id;
  20         int advertising;
  21         int phy_id_mask;
  22         int reg_num_mask;
  23
  24         unsigned int full_duplex : 1;   /* is full duplex? */
  25         unsigned int force_media : 1;   /* is autoneg. disabled? */
  26         unsigned int supports_gmii : 1; /* are GMII registers supported? */
  27
  28         struct net_device *dev;
  29         int (*mdio_read) (struct net_device *dev, int phy_id, int location);
  30         void (*mdio_write) (struct net_device *dev, int phy_id, int location, int val);
  31 };
  32
  33 extern int mii_link_ok (struct mii_if_info *mii);
  34 extern int mii_nway_restart (struct mii_if_info *mii);
  35 extern void mii_ethtool_gset(struct mii_if_info *mii, struct ethtool_cmd *ecmd);
  36 extern void mii_ethtool_get_link_ksettings(
  37         struct mii_if_info *mii, struct ethtool_link_ksettings *cmd);
  38 extern int mii_ethtool_sset(struct mii_if_info *mii, struct ethtool_cmd *ecmd);
  39 extern int mii_ethtool_set_link_ksettings(
  40         struct mii_if_info *mii, const struct ethtool_link_ksettings *cmd);
  41 extern int mii_check_gmii_support(struct mii_if_info *mii);
  42 extern void mii_check_link (struct mii_if_info *mii);
  43 extern unsigned int mii_check_media (struct mii_if_info *mii,
  44                                      unsigned int ok_to_print,
  45                                      unsigned int init_media);
  46 extern int generic_mii_ioctl(struct mii_if_info *mii_if,
  47                              struct mii_ioctl_data *mii_data, int cmd,
  48                              unsigned int *duplex_changed);
  49
  50
  51 static inline struct mii_ioctl_data *if_mii(struct ifreq *rq)
  52 {
  53         return (struct mii_ioctl_data *) &rq->ifr_ifru;
  54 }
  55
  56 /**
  57  * mii_nway_result
  58  * @negotiated: value of MII ANAR and'd with ANLPAR
  59  *
  60  * Given a set of MII abilities, check each bit and returns the
  61  * currently supported media, in the priority order defined by
  62  * IEEE 802.3u.  We use LPA_xxx constants but note this is not the
  63  * value of LPA solely, as described above.
  64  *
  65  * The one exception to IEEE 802.3u is that 100baseT4 is placed
  66  * between 100T-full and 100T-half.  If your phy does not support
  67  * 100T4 this is fine.  If your phy places 100T4 elsewhere in the
  68  * priority order, you will need to roll your own function.
  69  */
  70 static inline unsigned int mii_nway_result (unsigned int negotiated)
  71 {
  72         unsigned int ret;
  73
  74         if (negotiated & LPA_100FULL)
  75                 ret = LPA_100FULL;
  76         else if (negotiated & LPA_100BASE4)
  77                 ret = LPA_100BASE4;
  78         else if (negotiated & LPA_100HALF)
  79                 ret = LPA_100HALF;
  80         else if (negotiated & LPA_10FULL)
  81                 ret = LPA_10FULL;
  82         else
  83                 ret = LPA_10HALF;
  84
  85         return ret;
  86 }
  87
  88 /**
  89  * mii_duplex
  90  * @duplex_lock: Non-zero if duplex is locked at full
  91  * @negotiated: value of MII ANAR and'd with ANLPAR
  92  *
  93  * A small helper function for a common case.  Returns one
  94  * if the media is operating or locked at full duplex, and
  95  * returns zero otherwise.
  96  */
  97 static inline unsigned int mii_duplex (unsigned int duplex_lock,
  98                                        unsigned int negotiated)
  99 {
 100         if (duplex_lock)
 101                 return 1;
 102         if (mii_nway_result(negotiated) & LPA_DUPLEX)
 103                 return 1;
 104         return 0;
 105 }
 106
 107 /**
 108  * ethtool_adv_to_mii_adv_t
 109  * @ethadv: the ethtool advertisement settings
 110  *
 111  * A small helper function that translates ethtool advertisement
 112  * settings to phy autonegotiation advertisements for the
 113  * MII_ADVERTISE register.
 114  */
 115 static inline u32 ethtool_adv_to_mii_adv_t(u32 ethadv)
 116 {
 117         u32 result = 0;
 118
 119         if (ethadv & ADVERTISED_10baseT_Half)
 120                 result |= ADVERTISE_10HALF;
 121         if (ethadv & ADVERTISED_10baseT_Full)
 122                 result |= ADVERTISE_10FULL;
 123         if (ethadv & ADVERTISED_100baseT_Half)
 124                 result |= ADVERTISE_100HALF;
 125         if (ethadv & ADVERTISED_100baseT_Full)
 126                 result |= ADVERTISE_100FULL;
 127         if (ethadv & ADVERTISED_Pause)
 128                 result |= ADVERTISE_PAUSE_CAP;
 129         if (ethadv & ADVERTISED_Asym_Pause)
 130                 result |= ADVERTISE_PAUSE_ASYM;
 131
 132         return result;
 133 }
 134
 135 /**
 136  * linkmode_adv_to_mii_adv_t
 137  * @advertising: the linkmode advertisement settings
 138  *
 139  * A small helper function that translates linkmode advertisement
 140  * settings to phy autonegotiation advertisements for the
 141  * MII_ADVERTISE register.
 142  */
 143 static inline u32 linkmode_adv_to_mii_adv_t(unsigned long *advertising)
 144 {
 145         u32 result = 0;
 146
 147         if (linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT, advertising))
 148                 result |= ADVERTISE_10HALF;
 149         if (linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT, advertising))
 150                 result |= ADVERTISE_10FULL;
 151         if (linkmode_test_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT, advertising))
 152                 result |= ADVERTISE_100HALF;
 153         if (linkmode_test_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, advertising))
 154                 result |= ADVERTISE_100FULL;
 155         if (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT, advertising))
 156                 result |= ADVERTISE_PAUSE_CAP;
 157         if (linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, advertising))
 158                 result |= ADVERTISE_PAUSE_ASYM;
 159
 160         return result;
 161 }
 162
 163 /**
 164  * mii_adv_to_ethtool_adv_t
 165  * @adv: value of the MII_ADVERTISE register
 166  *
 167  * A small helper function that translates MII_ADVERTISE bits
 168  * to ethtool advertisement settings.
 169  */
 170 static inline u32 mii_adv_to_ethtool_adv_t(u32 adv)
 171 {
 172         u32 result = 0;
 173
 174         if (adv & ADVERTISE_10HALF)
 175                 result |= ADVERTISED_10baseT_Half;
 176         if (adv & ADVERTISE_10FULL)
 177                 result |= ADVERTISED_10baseT_Full;
 178         if (adv & ADVERTISE_100HALF)
 179                 result |= ADVERTISED_100baseT_Half;
 180         if (adv & ADVERTISE_100FULL)
 181                 result |= ADVERTISED_100baseT_Full;
 182         if (adv & ADVERTISE_PAUSE_CAP)
 183                 result |= ADVERTISED_Pause;
 184         if (adv & ADVERTISE_PAUSE_ASYM)
 185                 result |= ADVERTISED_Asym_Pause;
 186
 187         return result;
 188 }
 189
 190 /**
 191  * ethtool_adv_to_mii_ctrl1000_t
 192  * @ethadv: the ethtool advertisement settings
 193  *
 194  * A small helper function that translates ethtool advertisement
 195  * settings to phy autonegotiation advertisements for the
 196  * MII_CTRL1000 register when in 1000T mode.
 197  */
 198 static inline u32 ethtool_adv_to_mii_ctrl1000_t(u32 ethadv)
 199 {
 200         u32 result = 0;
 201
 202         if (ethadv & ADVERTISED_1000baseT_Half)
 203                 result |= ADVERTISE_1000HALF;
 204         if (ethadv & ADVERTISED_1000baseT_Full)
 205                 result |= ADVERTISE_1000FULL;
 206
 207         return result;
 208 }
 209
 210 /**
 211  * linkmode_adv_to_mii_ctrl1000_t
 212  * @advertising: the linkmode advertisement settings
 213  *
 214  * A small helper function that translates linkmode advertisement
 215  * settings to phy autonegotiation advertisements for the
 216  * MII_CTRL1000 register when in 1000T mode.
 217  */
 218 static inline u32 linkmode_adv_to_mii_ctrl1000_t(unsigned long *advertising)
 219 {
 220         u32 result = 0;
 221
 222         if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
 223                               advertising))
 224                 result |= ADVERTISE_1000HALF;
 225         if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
 226                               advertising))
 227                 result |= ADVERTISE_1000FULL;
 228
 229         return result;
 230 }
 231
 232 /**
 233  * mii_ctrl1000_to_ethtool_adv_t
 234  * @adv: value of the MII_CTRL1000 register
 235  *
 236  * A small helper function that translates MII_CTRL1000
 237  * bits, when in 1000Base-T mode, to ethtool
 238  * advertisement settings.
 239  */
 240 static inline u32 mii_ctrl1000_to_ethtool_adv_t(u32 adv)
 241 {
 242         u32 result = 0;
 243
 244         if (adv & ADVERTISE_1000HALF)
 245                 result |= ADVERTISED_1000baseT_Half;
 246         if (adv & ADVERTISE_1000FULL)
 247                 result |= ADVERTISED_1000baseT_Full;
 248
 249         return result;
 250 }
 251
 252 /**
 253  * mii_lpa_to_ethtool_lpa_t
 254  * @adv: value of the MII_LPA register
 255  *
 256  * A small helper function that translates MII_LPA
 257  * bits, when in 1000Base-T mode, to ethtool
 258  * LP advertisement settings.
 259  */
 260 static inline u32 mii_lpa_to_ethtool_lpa_t(u32 lpa)
 261 {
 262         u32 result = 0;
 263
 264         if (lpa & LPA_LPACK)
 265                 result |= ADVERTISED_Autoneg;
 266
 267         return result | mii_adv_to_ethtool_adv_t(lpa);
 268 }
 269
 270 /**
 271  * mii_stat1000_to_ethtool_lpa_t
 272  * @adv: value of the MII_STAT1000 register
 273  *
 274  * A small helper function that translates MII_STAT1000
 275  * bits, when in 1000Base-T mode, to ethtool
 276  * advertisement settings.
 277  */
 278 static inline u32 mii_stat1000_to_ethtool_lpa_t(u32 lpa)
 279 {
 280         u32 result = 0;
 281
 282         if (lpa & LPA_1000HALF)
 283                 result |= ADVERTISED_1000baseT_Half;
 284         if (lpa & LPA_1000FULL)
 285                 result |= ADVERTISED_1000baseT_Full;
 286
 287         return result;
 288 }
 289
 290 /**
 291  * mii_stat1000_mod_linkmode_lpa_t
 292  * @advertising: target the linkmode advertisement settings
 293  * @adv: value of the MII_STAT1000 register
 294  *
 295  * A small helper function that translates MII_STAT1000 bits, when in
 296  * 1000Base-T mode, to linkmode advertisement settings. Other bits in
 297  * advertising are not changes.
 298  */
 299 static inline void mii_stat1000_mod_linkmode_lpa_t(unsigned long *advertising,
 300                                                    u32 lpa)
 301 {
 302         linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
 303                          advertising, lpa & LPA_1000HALF);
 304
 305         linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
 306                          advertising, lpa & LPA_1000FULL);
 307 }
 308
 309 /**
 310  * ethtool_adv_to_mii_adv_x
 311  * @ethadv: the ethtool advertisement settings
 312  *
 313  * A small helper function that translates ethtool advertisement
 314  * settings to phy autonegotiation advertisements for the
 315  * MII_CTRL1000 register when in 1000Base-X mode.
 316  */
 317 static inline u32 ethtool_adv_to_mii_adv_x(u32 ethadv)
 318 {
 319         u32 result = 0;
 320
 321         if (ethadv & ADVERTISED_1000baseT_Half)
 322                 result |= ADVERTISE_1000XHALF;
 323         if (ethadv & ADVERTISED_1000baseT_Full)
 324                 result |= ADVERTISE_1000XFULL;
 325         if (ethadv & ADVERTISED_Pause)
 326                 result |= ADVERTISE_1000XPAUSE;
 327         if (ethadv & ADVERTISED_Asym_Pause)
 328                 result |= ADVERTISE_1000XPSE_ASYM;
 329
 330         return result;
 331 }
 332
 333 /**
 334  * mii_adv_to_ethtool_adv_x
 335  * @adv: value of the MII_CTRL1000 register
 336  *
 337  * A small helper function that translates MII_CTRL1000
 338  * bits, when in 1000Base-X mode, to ethtool
 339  * advertisement settings.
 340  */
 341 static inline u32 mii_adv_to_ethtool_adv_x(u32 adv)
 342 {
 343         u32 result = 0;
 344
 345         if (adv & ADVERTISE_1000XHALF)
 346                 result |= ADVERTISED_1000baseT_Half;
 347         if (adv & ADVERTISE_1000XFULL)
 348                 result |= ADVERTISED_1000baseT_Full;
 349         if (adv & ADVERTISE_1000XPAUSE)
 350                 result |= ADVERTISED_Pause;
 351         if (adv & ADVERTISE_1000XPSE_ASYM)
 352                 result |= ADVERTISED_Asym_Pause;
 353
 354         return result;
 355 }
 356
 357 /**
 358  * mii_lpa_mod_linkmode_adv_sgmii
 359  * @lp_advertising: pointer to destination link mode.
 360  * @lpa: value of the MII_LPA register
 361  *
 362  * A small helper function that translates MII_LPA bits to
 363  * linkmode advertisement settings for SGMII.
 364  * Leaves other bits unchanged.
 365  */
 366 static inline void
 367 mii_lpa_mod_linkmode_lpa_sgmii(unsigned long *lp_advertising, u32 lpa)
 368 {
 369         u32 speed_duplex = lpa & LPA_SGMII_DPX_SPD_MASK;
 370
 371         linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT, lp_advertising,
 372                          speed_duplex == LPA_SGMII_1000HALF);
 373
 374         linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, lp_advertising,
 375                          speed_duplex == LPA_SGMII_1000FULL);
 376
 377         linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT, lp_advertising,
 378                          speed_duplex == LPA_SGMII_100HALF);
 379
 380         linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, lp_advertising,
 381                          speed_duplex == LPA_SGMII_100FULL);
 382
 383         linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT, lp_advertising,
 384                          speed_duplex == LPA_SGMII_10HALF);
 385
 386         linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT, lp_advertising,
 387                          speed_duplex == LPA_SGMII_10FULL);
 388 }
 389
 390 /**
 391  * mii_lpa_to_linkmode_adv_sgmii
 392  * @advertising: pointer to destination link mode.
 393  * @lpa: value of the MII_LPA register
 394  *
 395  * A small helper function that translates MII_ADVERTISE bits
 396  * to linkmode advertisement settings when in SGMII mode.
 397  * Clears the old value of advertising.
 398  */
 399 static inline void mii_lpa_to_linkmode_lpa_sgmii(unsigned long *lp_advertising,
 400                                                  u32 lpa)
 401 {
 402         linkmode_zero(lp_advertising);
 403
 404         mii_lpa_mod_linkmode_lpa_sgmii(lp_advertising, lpa);
 405 }
 406
 407 /**
 408  * mii_adv_mod_linkmode_adv_t
 409  * @advertising:pointer to destination link mode.
 410  * @adv: value of the MII_ADVERTISE register
 411  *
 412  * A small helper function that translates MII_ADVERTISE bits to
 413  * linkmode advertisement settings. Leaves other bits unchanged.
 414  */
 415 static inline void mii_adv_mod_linkmode_adv_t(unsigned long *advertising,
 416                                               u32 adv)
 417 {
 418         linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT,
 419                          advertising, adv & ADVERTISE_10HALF);
 420
 421         linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT,
 422                          advertising, adv & ADVERTISE_10FULL);
 423
 424         linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT,
 425                          advertising, adv & ADVERTISE_100HALF);
 426
 427         linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
 428                          advertising, adv & ADVERTISE_100FULL);
 429
 430         linkmode_mod_bit(ETHTOOL_LINK_MODE_Pause_BIT, advertising,
 431                          adv & ADVERTISE_PAUSE_CAP);
 432
 433         linkmode_mod_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
 434                          advertising, adv & ADVERTISE_PAUSE_ASYM);
 435 }
 436
 437 /**
 438  * mii_adv_to_linkmode_adv_t
 439  * @advertising:pointer to destination link mode.
 440  * @adv: value of the MII_ADVERTISE register
 441  *
 442  * A small helper function that translates MII_ADVERTISE bits
 443  * to linkmode advertisement settings. Clears the old value
 444  * of advertising.
 445  */
 446 static inline void mii_adv_to_linkmode_adv_t(unsigned long *advertising,
 447                                              u32 adv)
 448 {
 449         linkmode_zero(advertising);
 450
 451         mii_adv_mod_linkmode_adv_t(advertising, adv);
 452 }
 453
 454 /**
 455  * mii_lpa_to_linkmode_lpa_t
 456  * @adv: value of the MII_LPA register
 457  *
 458  * A small helper function that translates MII_LPA bits, when in
 459  * 1000Base-T mode, to linkmode LP advertisement settings. Clears the
 460  * old value of advertising
 461  */
 462 static inline void mii_lpa_to_linkmode_lpa_t(unsigned long *lp_advertising,
 463                                              u32 lpa)
 464 {
 465         mii_adv_to_linkmode_adv_t(lp_advertising, lpa);
 466
 467         if (lpa & LPA_LPACK)
 468                 linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
 469                                  lp_advertising);
 470
 471 }
 472
 473 /**
 474  * mii_lpa_mod_linkmode_lpa_t
 475  * @adv: value of the MII_LPA register
 476  *
 477  * A small helper function that translates MII_LPA bits, when in
 478  * 1000Base-T mode, to linkmode LP advertisement settings. Leaves
 479  * other bits unchanged.
 480  */
 481 static inline void mii_lpa_mod_linkmode_lpa_t(unsigned long *lp_advertising,
 482                                               u32 lpa)
 483 {
 484         mii_adv_mod_linkmode_adv_t(lp_advertising, lpa);
 485
 486         linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
 487                          lp_advertising, lpa & LPA_LPACK);
 488 }
 489
 490 static inline void mii_ctrl1000_mod_linkmode_adv_t(unsigned long *advertising,
 491                                                    u32 ctrl1000)
 492 {
 493         linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT, advertising,
 494                          ctrl1000 & ADVERTISE_1000HALF);
 495         linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, advertising,
 496                          ctrl1000 & ADVERTISE_1000FULL);
 497 }
 498
 499 /**
 500  * linkmode_adv_to_lcl_adv_t
 501  * @advertising:pointer to linkmode advertising
 502  *
 503  * A small helper function that translates linkmode advertising to LVL
 504  * pause capabilities.
 505  */
 506 static inline u32 linkmode_adv_to_lcl_adv_t(unsigned long *advertising)
 507 {
 508         u32 lcl_adv = 0;
 509
 510         if (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
 511                               advertising))
 512                 lcl_adv |= ADVERTISE_PAUSE_CAP;
 513         if (linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
 514                               advertising))
 515                 lcl_adv |= ADVERTISE_PAUSE_ASYM;
 516
 517         return lcl_adv;
 518 }
 519
 520 /**
 521  * mii_lpa_mod_linkmode_x - decode the link partner's config_reg to linkmodes
 522  * @linkmodes: link modes array
 523  * @lpa: config_reg word from link partner
 524  * @fd_bit: link mode for 1000XFULL bit
 525  */
 526 static inline void mii_lpa_mod_linkmode_x(unsigned long *linkmodes, u16 lpa,
 527                                          int fd_bit)
 528 {
 529         linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, linkmodes,
 530                          lpa & LPA_LPACK);
 531         linkmode_mod_bit(ETHTOOL_LINK_MODE_Pause_BIT, linkmodes,
 532                          lpa & LPA_1000XPAUSE);
 533         linkmode_mod_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, linkmodes,
 534                          lpa & LPA_1000XPAUSE_ASYM);
 535         linkmode_mod_bit(fd_bit, linkmodes,
 536                          lpa & LPA_1000XFULL);
 537 }
 538
 539 /**
 540  * linkmode_adv_to_mii_adv_x - encode a linkmode to config_reg
 541  * @linkmodes: linkmodes
 542  * @fd_bit: full duplex bit
 543  */
 544 static inline u16 linkmode_adv_to_mii_adv_x(const unsigned long *linkmodes,
 545                                             int fd_bit)
 546 {
 547         u16 adv = 0;
 548
 549         if (linkmode_test_bit(fd_bit, linkmodes))
 550                 adv |= ADVERTISE_1000XFULL;
 551         if (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT, linkmodes))
 552                 adv |= ADVERTISE_1000XPAUSE;
 553         if (linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, linkmodes))
 554                 adv |= ADVERTISE_1000XPSE_ASYM;
 555
 556         return adv;
 557 }
 558
 559 /**
 560  * mii_advertise_flowctrl - get flow control advertisement flags
 561  * @cap: Flow control capabilities (FLOW_CTRL_RX, FLOW_CTRL_TX or both)
 562  */
 563 static inline u16 mii_advertise_flowctrl(int cap)
 564 {
 565         u16 adv = 0;
 566
 567         if (cap & FLOW_CTRL_RX)
 568                 adv = ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM;
 569         if (cap & FLOW_CTRL_TX)
 570                 adv ^= ADVERTISE_PAUSE_ASYM;
 571
 572         return adv;
 573 }
 574
 575 /**
 576  * mii_resolve_flowctrl_fdx
 577  * @lcladv: value of MII ADVERTISE register
 578  * @rmtadv: value of MII LPA register
 579  *
 580  * Resolve full duplex flow control as per IEEE 802.3-2005 table 28B-3
 581  */
 582 static inline u8 mii_resolve_flowctrl_fdx(u16 lcladv, u16 rmtadv)
 583 {
 584         u8 cap = 0;
 585
 586         if (lcladv & rmtadv & ADVERTISE_PAUSE_CAP) {
 587                 cap = FLOW_CTRL_TX | FLOW_CTRL_RX;
 588         } else if (lcladv & rmtadv & ADVERTISE_PAUSE_ASYM) {
 589                 if (lcladv & ADVERTISE_PAUSE_CAP)
 590                         cap = FLOW_CTRL_RX;
 591                 else if (rmtadv & ADVERTISE_PAUSE_CAP)
 592                         cap = FLOW_CTRL_TX;
 593         }
 594
 595         return cap;
 596 }
 597
 598 #endif /* __LINUX_MII_H__ */