1 // SPDX-License-Identifier: GPL-2.0-or-later 2 3 #include <linux/ethtool.h> 4 #include <linux/linkmode.h> 5 #include <linux/phy.h> 6 7 #include "phy-caps.h" 8 9 static struct link_capabilities link_caps[__LINK_CAPA_MAX] __ro_after_init = { 10 { SPEED_10, DUPLEX_HALF, {0} }, /* LINK_CAPA_10HD */ 11 { SPEED_10, DUPLEX_FULL, {0} }, /* LINK_CAPA_10FD */ 12 { SPEED_100, DUPLEX_HALF, {0} }, /* LINK_CAPA_100HD */ 13 { SPEED_100, DUPLEX_FULL, {0} }, /* LINK_CAPA_100FD */ 14 { SPEED_1000, DUPLEX_HALF, {0} }, /* LINK_CAPA_1000HD */ 15 { SPEED_1000, DUPLEX_FULL, {0} }, /* LINK_CAPA_1000FD */ 16 { SPEED_2500, DUPLEX_FULL, {0} }, /* LINK_CAPA_2500FD */ 17 { SPEED_5000, DUPLEX_FULL, {0} }, /* LINK_CAPA_5000FD */ 18 { SPEED_10000, DUPLEX_FULL, {0} }, /* LINK_CAPA_10000FD */ 19 { SPEED_20000, DUPLEX_FULL, {0} }, /* LINK_CAPA_20000FD */ 20 { SPEED_25000, DUPLEX_FULL, {0} }, /* LINK_CAPA_25000FD */ 21 { SPEED_40000, DUPLEX_FULL, {0} }, /* LINK_CAPA_40000FD */ 22 { SPEED_50000, DUPLEX_FULL, {0} }, /* LINK_CAPA_50000FD */ 23 { SPEED_56000, DUPLEX_FULL, {0} }, /* LINK_CAPA_56000FD */ 24 { SPEED_100000, DUPLEX_FULL, {0} }, /* LINK_CAPA_100000FD */ 25 { SPEED_200000, DUPLEX_FULL, {0} }, /* LINK_CAPA_200000FD */ 26 { SPEED_400000, DUPLEX_FULL, {0} }, /* LINK_CAPA_400000FD */ 27 { SPEED_800000, DUPLEX_FULL, {0} }, /* LINK_CAPA_800000FD */ 28 }; 29 30 static int speed_duplex_to_capa(int speed, unsigned int duplex) 31 { 32 if (duplex == DUPLEX_UNKNOWN || 33 (speed > SPEED_1000 && duplex != DUPLEX_FULL)) 34 return -EINVAL; 35 36 switch (speed) { 37 case SPEED_10: return duplex == DUPLEX_FULL ? 38 LINK_CAPA_10FD : LINK_CAPA_10HD; 39 case SPEED_100: return duplex == DUPLEX_FULL ? 40 LINK_CAPA_100FD : LINK_CAPA_100HD; 41 case SPEED_1000: return duplex == DUPLEX_FULL ? 42 LINK_CAPA_1000FD : LINK_CAPA_1000HD; 43 case SPEED_2500: return LINK_CAPA_2500FD; 44 case SPEED_5000: return LINK_CAPA_5000FD; 45 case SPEED_10000: return LINK_CAPA_10000FD; 46 case SPEED_20000: return LINK_CAPA_20000FD; 47 case SPEED_25000: return LINK_CAPA_25000FD; 48 case SPEED_40000: return LINK_CAPA_40000FD; 49 case SPEED_50000: return LINK_CAPA_50000FD; 50 case SPEED_56000: return LINK_CAPA_56000FD; 51 case SPEED_100000: return LINK_CAPA_100000FD; 52 case SPEED_200000: return LINK_CAPA_200000FD; 53 case SPEED_400000: return LINK_CAPA_400000FD; 54 case SPEED_800000: return LINK_CAPA_800000FD; 55 } 56 57 return -EINVAL; 58 } 59 60 #define for_each_link_caps_asc_speed(cap) \ 61 for (cap = link_caps; cap < &link_caps[__LINK_CAPA_MAX]; cap++) 62 63 #define for_each_link_caps_desc_speed(cap) \ 64 for (cap = &link_caps[__LINK_CAPA_MAX - 1]; cap >= link_caps; cap--) 65 66 /** 67 * phy_caps_init() - Initializes the link_caps array from the link_mode_params. 68 * 69 * Returns: 0 if phy caps init was successful, -EINVAL if we found an 70 * unexpected linkmode setting that requires LINK_CAPS update. 71 * 72 */ 73 int phy_caps_init(void) 74 { 75 const struct link_mode_info *linkmode; 76 int i, capa; 77 78 /* Fill the caps array from net/ethtool/common.c */ 79 for (i = 0; i < __ETHTOOL_LINK_MODE_MASK_NBITS; i++) { 80 linkmode = &link_mode_params[i]; 81 capa = speed_duplex_to_capa(linkmode->speed, linkmode->duplex); 82 83 if (capa < 0) { 84 if (linkmode->speed != SPEED_UNKNOWN) { 85 pr_err("Unknown speed %d, please update LINK_CAPS\n", 86 linkmode->speed); 87 return -EINVAL; 88 } 89 continue; 90 } 91 92 __set_bit(i, link_caps[capa].linkmodes); 93 } 94 95 return 0; 96 } 97 98 /** 99 * phy_caps_speeds() - Fill an array of supported SPEED_* values for given modes 100 * @speeds: Output array to store the speeds list into 101 * @size: Size of the output array 102 * @linkmodes: Linkmodes to get the speeds from 103 * 104 * Fills the speeds array with all possible speeds that can be achieved with 105 * the specified linkmodes. 106 * 107 * Returns: The number of speeds filled into the array. If the input array isn't 108 * big enough to store all speeds, fill it as much as possible. 109 */ 110 size_t phy_caps_speeds(unsigned int *speeds, size_t size, 111 unsigned long *linkmodes) 112 { 113 struct link_capabilities *lcap; 114 size_t count = 0; 115 116 for_each_link_caps_asc_speed(lcap) { 117 if (linkmode_intersects(lcap->linkmodes, linkmodes) && 118 (count == 0 || speeds[count - 1] != lcap->speed)) { 119 speeds[count++] = lcap->speed; 120 if (count >= size) 121 break; 122 } 123 } 124 125 return count; 126 } 127 128 /** 129 * phy_caps_lookup_by_linkmode() - Lookup the fastest matching link_capabilities 130 * @linkmodes: Linkmodes to match against 131 * 132 * Returns: The highest-speed link_capabilities that intersects the given 133 * linkmodes. In case several DUPLEX_ options exist at that speed, 134 * DUPLEX_FULL is matched first. NULL is returned if no match. 135 */ 136 const struct link_capabilities * 137 phy_caps_lookup_by_linkmode(const unsigned long *linkmodes) 138 { 139 struct link_capabilities *lcap; 140 141 for_each_link_caps_desc_speed(lcap) 142 if (linkmode_intersects(lcap->linkmodes, linkmodes)) 143 return lcap; 144 145 return NULL; 146 } 147 148 /** 149 * phy_caps_lookup_by_linkmode_rev() - Lookup the slowest matching link_capabilities 150 * @linkmodes: Linkmodes to match against 151 * @fdx_only: Full duplex match only when set 152 * 153 * Returns: The lowest-speed link_capabilities that intersects the given 154 * linkmodes. When set, fdx_only will ignore half-duplex matches. 155 * NULL is returned if no match. 156 */ 157 const struct link_capabilities * 158 phy_caps_lookup_by_linkmode_rev(const unsigned long *linkmodes, bool fdx_only) 159 { 160 struct link_capabilities *lcap; 161 162 for_each_link_caps_asc_speed(lcap) { 163 if (fdx_only && lcap->duplex != DUPLEX_FULL) 164 continue; 165 166 if (linkmode_intersects(lcap->linkmodes, linkmodes)) 167 return lcap; 168 } 169 170 return NULL; 171 } 172 173 /** 174 * phy_caps_lookup() - Lookup capabilities by speed/duplex that matches a mask 175 * @speed: Speed to match 176 * @duplex: Duplex to match 177 * @supported: Mask of linkmodes to match 178 * @exact: Perform an exact match or not. 179 * 180 * Lookup a link_capabilities entry that intersect the supported linkmodes mask, 181 * and that matches the passed speed and duplex. 182 * 183 * When @exact is set, an exact match is performed on speed and duplex, meaning 184 * that if the linkmodes for the given speed and duplex intersect the supported 185 * mask, this capability is returned, otherwise we don't have a match and return 186 * NULL. 187 * 188 * When @exact is not set, we return either an exact match, or matching capabilities 189 * at lower speed, or the lowest matching speed, or NULL. 190 * 191 * Returns: a matched link_capabilities according to the above process, NULL 192 * otherwise. 193 */ 194 const struct link_capabilities * 195 phy_caps_lookup(int speed, unsigned int duplex, const unsigned long *supported, 196 bool exact) 197 { 198 const struct link_capabilities *lcap, *last = NULL; 199 200 for_each_link_caps_desc_speed(lcap) { 201 if (linkmode_intersects(lcap->linkmodes, supported)) { 202 last = lcap; 203 /* exact match on speed and duplex*/ 204 if (lcap->speed == speed && lcap->duplex == duplex) { 205 return lcap; 206 } else if (!exact) { 207 if (lcap->speed <= speed) 208 return lcap; 209 } 210 } 211 } 212 213 if (!exact) 214 return last; 215 216 return NULL; 217 } 218 EXPORT_SYMBOL_GPL(phy_caps_lookup); 219 220 /** 221 * phy_caps_linkmode_max_speed() - Clamp a linkmodes set to a max speed 222 * @max_speed: Speed limit for the linkmode set 223 * @linkmodes: Linkmodes to limit 224 */ 225 void phy_caps_linkmode_max_speed(u32 max_speed, unsigned long *linkmodes) 226 { 227 struct link_capabilities *lcap; 228 229 for_each_link_caps_desc_speed(lcap) 230 if (lcap->speed > max_speed) 231 linkmode_andnot(linkmodes, linkmodes, lcap->linkmodes); 232 else 233 break; 234 } 235 236 /** 237 * phy_caps_valid() - Validate a linkmodes set agains given speed and duplex 238 * @speed: input speed to validate 239 * @duplex: input duplex to validate. Passing DUPLEX_UNKNOWN is always not valid 240 * @linkmodes: The linkmodes to validate 241 * 242 * Returns: True if at least one of the linkmodes in @linkmodes can function at 243 * the given speed and duplex, false otherwise. 244 */ 245 bool phy_caps_valid(int speed, int duplex, const unsigned long *linkmodes) 246 { 247 int capa = speed_duplex_to_capa(speed, duplex); 248 249 if (capa < 0) 250 return false; 251 252 return linkmode_intersects(link_caps[capa].linkmodes, linkmodes); 253 } 254 255 /** 256 * phy_caps_linkmodes() - Convert a bitfield of capabilities into linkmodes 257 * @caps: The list of caps, each bit corresponding to a LINK_CAPA value 258 * @linkmodes: The set of linkmodes to fill. Must be previously initialized. 259 */ 260 void phy_caps_linkmodes(unsigned long caps, unsigned long *linkmodes) 261 { 262 unsigned long capa; 263 264 for_each_set_bit(capa, &caps, __LINK_CAPA_MAX) 265 linkmode_or(linkmodes, linkmodes, link_caps[capa].linkmodes); 266 } 267 EXPORT_SYMBOL_GPL(phy_caps_linkmodes); 268 269 /** 270 * phy_caps_from_interface() - Get the link capa from a given PHY interface 271 * @interface: The PHY interface we want to get the possible Speed/Duplex from 272 * 273 * Returns: A bitmask of LINK_CAPA_xxx values that can be achieved with the 274 * provided interface. 275 */ 276 unsigned long phy_caps_from_interface(phy_interface_t interface) 277 { 278 unsigned long link_caps = 0; 279 280 switch (interface) { 281 case PHY_INTERFACE_MODE_USXGMII: 282 link_caps |= BIT(LINK_CAPA_10000FD) | BIT(LINK_CAPA_5000FD); 283 fallthrough; 284 285 case PHY_INTERFACE_MODE_10G_QXGMII: 286 link_caps |= BIT(LINK_CAPA_2500FD); 287 fallthrough; 288 289 case PHY_INTERFACE_MODE_RGMII_TXID: 290 case PHY_INTERFACE_MODE_RGMII_RXID: 291 case PHY_INTERFACE_MODE_RGMII_ID: 292 case PHY_INTERFACE_MODE_RGMII: 293 case PHY_INTERFACE_MODE_PSGMII: 294 case PHY_INTERFACE_MODE_QSGMII: 295 case PHY_INTERFACE_MODE_QUSGMII: 296 case PHY_INTERFACE_MODE_SGMII: 297 case PHY_INTERFACE_MODE_GMII: 298 link_caps |= BIT(LINK_CAPA_1000HD) | BIT(LINK_CAPA_1000FD); 299 fallthrough; 300 301 case PHY_INTERFACE_MODE_REVRMII: 302 case PHY_INTERFACE_MODE_RMII: 303 case PHY_INTERFACE_MODE_SMII: 304 case PHY_INTERFACE_MODE_REVMII: 305 case PHY_INTERFACE_MODE_MII: 306 link_caps |= BIT(LINK_CAPA_10HD) | BIT(LINK_CAPA_10FD); 307 fallthrough; 308 309 case PHY_INTERFACE_MODE_100BASEX: 310 link_caps |= BIT(LINK_CAPA_100HD) | BIT(LINK_CAPA_100FD); 311 break; 312 313 case PHY_INTERFACE_MODE_TBI: 314 case PHY_INTERFACE_MODE_MOCA: 315 case PHY_INTERFACE_MODE_RTBI: 316 case PHY_INTERFACE_MODE_1000BASEX: 317 link_caps |= BIT(LINK_CAPA_1000HD); 318 fallthrough; 319 case PHY_INTERFACE_MODE_1000BASEKX: 320 case PHY_INTERFACE_MODE_TRGMII: 321 link_caps |= BIT(LINK_CAPA_1000FD); 322 break; 323 324 case PHY_INTERFACE_MODE_2500BASEX: 325 link_caps |= BIT(LINK_CAPA_2500FD); 326 break; 327 328 case PHY_INTERFACE_MODE_5GBASER: 329 link_caps |= BIT(LINK_CAPA_5000FD); 330 break; 331 332 case PHY_INTERFACE_MODE_XGMII: 333 case PHY_INTERFACE_MODE_RXAUI: 334 case PHY_INTERFACE_MODE_XAUI: 335 case PHY_INTERFACE_MODE_10GBASER: 336 case PHY_INTERFACE_MODE_10GKR: 337 link_caps |= BIT(LINK_CAPA_10000FD); 338 break; 339 340 case PHY_INTERFACE_MODE_25GBASER: 341 link_caps |= BIT(LINK_CAPA_25000FD); 342 break; 343 344 case PHY_INTERFACE_MODE_XLGMII: 345 link_caps |= BIT(LINK_CAPA_40000FD); 346 break; 347 348 case PHY_INTERFACE_MODE_INTERNAL: 349 link_caps |= LINK_CAPA_ALL; 350 break; 351 352 case PHY_INTERFACE_MODE_NA: 353 case PHY_INTERFACE_MODE_MAX: 354 break; 355 } 356 357 return link_caps; 358 } 359 EXPORT_SYMBOL_GPL(phy_caps_from_interface); 360