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  */
phylink_set_port_modes(unsigned long * mask)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 
phylink_is_empty_linkmode(const unsigned long * linkmode)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 
phylink_an_mode_str(unsigned int mode)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 
phylink_caps_to_linkmodes(unsigned long * linkmodes,unsigned long caps)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  */
phylink_get_linkmodes(unsigned long * linkmodes,phy_interface_t interface,unsigned long mac_capabilities)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  */
phylink_generic_validate(struct phylink_config * config,unsigned long * supported,struct phylink_link_state * state)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 
phylink_validate_mac_and_pcs(struct phylink * pl,unsigned long * supported,struct phylink_link_state * state)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 
phylink_validate_any(struct phylink * pl,unsigned long * supported,struct phylink_link_state * state)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 
phylink_validate(struct phylink * pl,unsigned long * supported,struct phylink_link_state * state)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 
phylink_parse_fixedlink(struct phylink * pl,struct fwnode_handle * fwnode)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 
phylink_parse_mode(struct phylink * pl,struct fwnode_handle * fwnode)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 
phylink_apply_manual_flow(struct phylink * pl,struct phylink_link_state * state)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 
phylink_resolve_flow(struct phylink_link_state * state)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 
phylink_mac_config(struct phylink * pl,const struct phylink_link_state * state)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 
phylink_mac_pcs_an_restart(struct phylink * pl)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 
phylink_major_config(struct phylink * pl,bool restart,const struct phylink_link_state * state)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  */
phylink_change_inband_advert(struct phylink * pl)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 
phylink_mac_pcs_get_state(struct phylink * pl,struct phylink_link_state * state)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  */
phylink_get_fixed_state(struct phylink * pl,struct phylink_link_state * state)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 
phylink_mac_initial_config(struct phylink * pl,bool force_restart)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 
phylink_pause_to_str(int pause)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 
phylink_link_up(struct phylink * pl,struct phylink_link_state link_state)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 
phylink_link_down(struct phylink * pl)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 
phylink_resolve(struct work_struct * w)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 
phylink_run_resolve(struct phylink * pl)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 
phylink_run_resolve_and_disable(struct phylink * pl,int bit)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 
phylink_enable_and_run_resolve(struct phylink * pl,int bit)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 
phylink_fixed_poll(struct timer_list * t)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 
phylink_register_sfp(struct phylink * pl,struct fwnode_handle * fwnode)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  */
phylink_create(struct phylink_config * config,struct fwnode_handle * fwnode,phy_interface_t iface,const struct phylink_mac_ops * mac_ops)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  */
phylink_destroy(struct phylink * pl)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 
phylink_phy_change(struct phy_device * phydev,bool up)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 
phylink_bringup_phy(struct phylink * pl,struct phy_device * phy,phy_interface_t interface)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 
phylink_attach_phy(struct phylink * pl,struct phy_device * phy,phy_interface_t interface)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  */
phylink_connect_phy(struct phylink * pl,struct phy_device * phy)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  */
phylink_of_phy_connect(struct phylink * pl,struct device_node * dn,u32 flags)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  */
phylink_fwnode_phy_connect(struct phylink * pl,struct fwnode_handle * fwnode,u32 flags)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  */
phylink_disconnect_phy(struct phylink * pl)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  */
phylink_mac_change(struct phylink * pl,bool up)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 
phylink_link_handler(int irq,void * data)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  */
phylink_start(struct phylink * pl)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  */
phylink_stop(struct phylink * pl)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  */
phylink_suspend(struct phylink * pl,bool mac_wol)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  */
phylink_resume(struct phylink * pl)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  */
phylink_ethtool_get_wol(struct phylink * pl,struct ethtool_wolinfo * wol)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  */
phylink_ethtool_set_wol(struct phylink * pl,struct ethtool_wolinfo * wol)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 
phylink_merge_link_mode(unsigned long * dst,const unsigned long * b)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 
phylink_get_ksettings(const struct phylink_link_state * state,struct ethtool_link_ksettings * kset)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  */
phylink_ethtool_ksettings_get(struct phylink * pl,struct ethtool_link_ksettings * kset)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  */
phylink_ethtool_ksettings_set(struct phylink * pl,const struct ethtool_link_ksettings * kset)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  */
phylink_ethtool_nway_reset(struct phylink * pl)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  */
phylink_ethtool_get_pauseparam(struct phylink * pl,struct ethtool_pauseparam * pause)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  */
phylink_ethtool_set_pauseparam(struct phylink * pl,struct ethtool_pauseparam * pause)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  */
phylink_get_eee_err(struct phylink * pl)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  */
phylink_init_eee(struct phylink * pl,bool clk_stop_enable)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  */
phylink_ethtool_get_eee(struct phylink * pl,struct ethtool_eee * eee)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  */
phylink_ethtool_set_eee(struct phylink * pl,struct ethtool_eee * eee)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  */
phylink_mii_emul_read(unsigned int reg,struct phylink_link_state * state)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 
phylink_phy_read(struct phylink * pl,unsigned int phy_id,unsigned int reg)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 
phylink_phy_write(struct phylink * pl,unsigned int phy_id,unsigned int reg,unsigned int val)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 
phylink_mii_read(struct phylink * pl,unsigned int phy_id,unsigned int reg)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 
phylink_mii_write(struct phylink * pl,unsigned int phy_id,unsigned int reg,unsigned int val)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  */
phylink_mii_ioctl(struct phylink * pl,struct ifreq * ifr,int cmd)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  */
phylink_speed_down(struct phylink * pl,bool sync)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  */
phylink_speed_up(struct phylink * pl)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 
phylink_sfp_attach(void * upstream,struct sfp_bus * bus)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 
phylink_sfp_detach(void * upstream,struct sfp_bus * bus)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 
phylink_sfp_config(struct phylink * pl,u8 mode,const unsigned long * supported,const unsigned long * advertising)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 
phylink_sfp_module_insert(void * upstream,const struct sfp_eeprom_id * id)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 
phylink_sfp_module_start(void * upstream)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 
phylink_sfp_module_stop(void * upstream)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 
phylink_sfp_link_down(void * upstream)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 
phylink_sfp_link_up(void * upstream)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  */
phylink_phy_no_inband(struct phy_device * phy)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 
phylink_sfp_connect_phy(void * upstream,struct phy_device * phy)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 
phylink_sfp_disconnect_phy(void * upstream)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 
phylink_decode_c37_word(struct phylink_link_state * state,uint16_t config_reg,int speed)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 
phylink_decode_sgmii_word(struct phylink_link_state * state,uint16_t config_reg)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  */
phylink_decode_usxgmii_word(struct phylink_link_state * state,uint16_t lpa)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  */
phylink_mii_c22_pcs_decode_state(struct phylink_link_state * state,u16 bmsr,u16 lpa)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  */
phylink_mii_c22_pcs_get_state(struct mdio_device * pcs,struct phylink_link_state * state)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  */
phylink_mii_c22_pcs_encode_advertisement(phy_interface_t interface,const unsigned long * advertising)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  */
phylink_mii_c22_pcs_config(struct mdio_device * pcs,unsigned int mode,phy_interface_t interface,const unsigned long * advertising)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  */
phylink_mii_c22_pcs_an_restart(struct mdio_device * pcs)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 
phylink_mii_c45_pcs_get_state(struct mdio_device * pcs,struct phylink_link_state * state)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");
3099