summaryrefslogtreecommitdiff
path: root/drivers/net/phy/phylink.c
blob: 42e5a681183f3ba3fcb5cb26ecf1ee7a1ac81989 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
// SPDX-License-Identifier: GPL-2.0
/*
 * phylink models the MAC to optional PHY connection, supporting
 * technologies such as SFP cages where the PHY is hot-pluggable.
 *
 * Copyright (C) 2015 Russell King
 */
#include <linux/acpi.h>
#include <linux/ethtool.h>
#include <linux/export.h>
#include <linux/gpio/consumer.h>
#include <linux/netdevice.h>
#include <linux/of.h>
#include <linux/of_mdio.h>
#include <linux/phy.h>
#include <linux/phy_fixed.h>
#include <linux/phylink.h>
#include <linux/rtnetlink.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <linux/workqueue.h>

#include "sfp.h"
#include "swphy.h"

#define SUPPORTED_INTERFACES \
	(SUPPORTED_TP | SUPPORTED_MII | SUPPORTED_FIBRE | \
	 SUPPORTED_BNC | SUPPORTED_AUI | SUPPORTED_Backplane)
#define ADVERTISED_INTERFACES \
	(ADVERTISED_TP | ADVERTISED_MII | ADVERTISED_FIBRE | \
	 ADVERTISED_BNC | ADVERTISED_AUI | ADVERTISED_Backplane)

enum {
	PHYLINK_DISABLE_STOPPED,
	PHYLINK_DISABLE_LINK,
	PHYLINK_DISABLE_MAC_WOL,
};

/**
 * struct phylink - internal data type for phylink
 */
struct phylink {
	/* private: */
	struct net_device *netdev;
	const struct phylink_mac_ops *mac_ops;
	const struct phylink_pcs_ops *pcs_ops;
	struct phylink_config *config;
	struct phylink_pcs *pcs;
	struct device *dev;
	unsigned int old_link_state:1;

	unsigned long phylink_disable_state; /* bitmask of disables */
	struct phy_device *phydev;
	phy_interface_t link_interface;	/* PHY_INTERFACE_xxx */
	u8 cfg_link_an_mode;		/* MLO_AN_xxx */
	u8 cur_link_an_mode;
	u8 link_port;			/* The current non-phy ethtool port */
	__ETHTOOL_DECLARE_LINK_MODE_MASK(supported);

	/* The link configuration settings */
	struct phylink_link_state link_config;

	/* The current settings */
	phy_interface_t cur_interface;

	struct gpio_desc *link_gpio;
	unsigned int link_irq;
	struct timer_list link_poll;
	void (*get_fixed_state)(struct net_device *dev,
				struct phylink_link_state *s);

	struct mutex state_mutex;
	struct phylink_link_state phy_state;
	struct work_struct resolve;

	bool mac_link_dropped;

	struct sfp_bus *sfp_bus;
	bool sfp_may_have_phy;
	__ETHTOOL_DECLARE_LINK_MODE_MASK(sfp_support);
	u8 sfp_port;
};

#define phylink_printk(level, pl, fmt, ...) \
	do { \
		if ((pl)->config->type == PHYLINK_NETDEV) \
			netdev_printk(level, (pl)->netdev, fmt, ##__VA_ARGS__); \
		else if ((pl)->config->type == PHYLINK_DEV) \
			dev_printk(level, (pl)->dev, fmt, ##__VA_ARGS__); \
	} while (0)

#define phylink_err(pl, fmt, ...) \
	phylink_printk(KERN_ERR, pl, fmt, ##__VA_ARGS__)
#define phylink_warn(pl, fmt, ...) \
	phylink_printk(KERN_WARNING, pl, fmt, ##__VA_ARGS__)
#define phylink_info(pl, fmt, ...) \
	phylink_printk(KERN_INFO, pl, fmt, ##__VA_ARGS__)
#if defined(CONFIG_DYNAMIC_DEBUG)
#define phylink_dbg(pl, fmt, ...) \
do {									\
	if ((pl)->config->type == PHYLINK_NETDEV)			\
		netdev_dbg((pl)->netdev, fmt, ##__VA_ARGS__);		\
	else if ((pl)->config->type == PHYLINK_DEV)			\
		dev_dbg((pl)->dev, fmt, ##__VA_ARGS__);			\
} while (0)
#elif defined(DEBUG)
#define phylink_dbg(pl, fmt, ...)					\
	phylink_printk(KERN_DEBUG, pl, fmt, ##__VA_ARGS__)
#else
#define phylink_dbg(pl, fmt, ...)					\
({									\
	if (0)								\
		phylink_printk(KERN_DEBUG, pl, fmt, ##__VA_ARGS__);	\
})
#endif

/**
 * phylink_set_port_modes() - set the port type modes in the ethtool mask
 * @mask: ethtool link mode mask
 *
 * Sets all the port type modes in the ethtool mask.  MAC drivers should
 * use this in their 'validate' callback.
 */
void phylink_set_port_modes(unsigned long *mask)
{
	phylink_set(mask, TP);
	phylink_set(mask, AUI);
	phylink_set(mask, MII);
	phylink_set(mask, FIBRE);
	phylink_set(mask, BNC);
	phylink_set(mask, Backplane);
}
EXPORT_SYMBOL_GPL(phylink_set_port_modes);

static int phylink_is_empty_linkmode(const unsigned long *linkmode)
{
	__ETHTOOL_DECLARE_LINK_MODE_MASK(tmp) = { 0, };

	phylink_set_port_modes(tmp);
	phylink_set(tmp, Autoneg);
	phylink_set(tmp, Pause);
	phylink_set(tmp, Asym_Pause);

	return linkmode_subset(linkmode, tmp);
}

static const char *phylink_an_mode_str(unsigned int mode)
{
	static const char *modestr[] = {
		[MLO_AN_PHY] = "phy",
		[MLO_AN_FIXED] = "fixed",
		[MLO_AN_INBAND] = "inband",
	};

	return mode < ARRAY_SIZE(modestr) ? modestr[mode] : "unknown";
}

static int phylink_validate(struct phylink *pl, unsigned long *supported,
			    struct phylink_link_state *state)
{
	pl->mac_ops->validate(pl->config, supported, state);

	return phylink_is_empty_linkmode(supported) ? -EINVAL : 0;
}

static int phylink_parse_fixedlink(struct phylink *pl,
				   struct fwnode_handle *fwnode)
{
	struct fwnode_handle *fixed_node;
	const struct phy_setting *s;
	struct gpio_desc *desc;
	u32 speed;
	int ret;

	fixed_node = fwnode_get_named_child_node(fwnode, "fixed-link");
	if (fixed_node) {
		ret = fwnode_property_read_u32(fixed_node, "speed", &speed);

		pl->link_config.speed = speed;
		pl->link_config.duplex = DUPLEX_HALF;

		if (fwnode_property_read_bool(fixed_node, "full-duplex"))
			pl->link_config.duplex = DUPLEX_FULL;

		/* We treat the "pause" and "asym-pause" terminology as
		 * defining the link partner's ability.
		 */
		if (fwnode_property_read_bool(fixed_node, "pause"))
			__set_bit(ETHTOOL_LINK_MODE_Pause_BIT,
				  pl->link_config.lp_advertising);
		if (fwnode_property_read_bool(fixed_node, "asym-pause"))
			__set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
				  pl->link_config.lp_advertising);

		if (ret == 0) {
			desc = fwnode_gpiod_get_index(fixed_node, "link", 0,
						      GPIOD_IN, "?");

			if (!IS_ERR(desc))
				pl->link_gpio = desc;
			else if (desc == ERR_PTR(-EPROBE_DEFER))
				ret = -EPROBE_DEFER;
		}
		fwnode_handle_put(fixed_node);

		if (ret)
			return ret;
	} else {
		u32 prop[5];

		ret = fwnode_property_read_u32_array(fwnode, "fixed-link",
						     NULL, 0);
		if (ret != ARRAY_SIZE(prop)) {
			phylink_err(pl, "broken fixed-link?\n");
			return -EINVAL;
		}

		ret = fwnode_property_read_u32_array(fwnode, "fixed-link",
						     prop, ARRAY_SIZE(prop));
		if (!ret) {
			pl->link_config.duplex = prop[1] ?
						DUPLEX_FULL : DUPLEX_HALF;
			pl->link_config.speed = prop[2];
			if (prop[3])
				__set_bit(ETHTOOL_LINK_MODE_Pause_BIT,
					  pl->link_config.lp_advertising);
			if (prop[4])
				__set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
					  pl->link_config.lp_advertising);
		}
	}

	if (pl->link_config.speed > SPEED_1000 &&
	    pl->link_config.duplex != DUPLEX_FULL)
		phylink_warn(pl, "fixed link specifies half duplex for %dMbps link?\n",
			     pl->link_config.speed);

	bitmap_fill(pl->supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
	linkmode_copy(pl->link_config.advertising, pl->supported);
	phylink_validate(pl, pl->supported, &pl->link_config);

	s = phy_lookup_setting(pl->link_config.speed, pl->link_config.duplex,
			       pl->supported, true);
	linkmode_zero(pl->supported);
	phylink_set(pl->supported, MII);
	phylink_set(pl->supported, Pause);
	phylink_set(pl->supported, Asym_Pause);
	phylink_set(pl->supported, Autoneg);
	if (s) {
		__set_bit(s->bit, pl->supported);
		__set_bit(s->bit, pl->link_config.lp_advertising);
	} else {
		phylink_warn(pl, "fixed link %s duplex %dMbps not recognised\n",
			     pl->link_config.duplex == DUPLEX_FULL ? "full" : "half",
			     pl->link_config.speed);
	}

	linkmode_and(pl->link_config.advertising, pl->link_config.advertising,
		     pl->supported);

	pl->link_config.link = 1;
	pl->link_config.an_complete = 1;

	return 0;
}

static int phylink_parse_mode(struct phylink *pl, struct fwnode_handle *fwnode)
{
	struct fwnode_handle *dn;
	const char *managed;

	dn = fwnode_get_named_child_node(fwnode, "fixed-link");
	if (dn || fwnode_property_present(fwnode, "fixed-link"))
		pl->cfg_link_an_mode = MLO_AN_FIXED;
	fwnode_handle_put(dn);

	if ((fwnode_property_read_string(fwnode, "managed", &managed) == 0 &&
	     strcmp(managed, "in-band-status") == 0) ||
	    pl->config->ovr_an_inband) {
		if (pl->cfg_link_an_mode == MLO_AN_FIXED) {
			phylink_err(pl,
				    "can't use both fixed-link and in-band-status\n");
			return -EINVAL;
		}

		linkmode_zero(pl->supported);
		phylink_set(pl->supported, MII);
		phylink_set(pl->supported, Autoneg);
		phylink_set(pl->supported, Asym_Pause);
		phylink_set(pl->supported, Pause);
		pl->link_config.an_enabled = true;
		pl->cfg_link_an_mode = MLO_AN_INBAND;

		switch (pl->link_config.interface) {
		case PHY_INTERFACE_MODE_SGMII:
		case PHY_INTERFACE_MODE_QSGMII:
			phylink_set(pl->supported, 10baseT_Half);
			phylink_set(pl->supported, 10baseT_Full);
			phylink_set(pl->supported, 100baseT_Half);
			phylink_set(pl->supported, 100baseT_Full);
			phylink_set(pl->supported, 1000baseT_Half);
			phylink_set(pl->supported, 1000baseT_Full);
			break;

		case PHY_INTERFACE_MODE_1000BASEX:
			phylink_set(pl->supported, 1000baseX_Full);
			break;

		case PHY_INTERFACE_MODE_2500BASEX:
			phylink_set(pl->supported, 2500baseX_Full);
			break;

		case PHY_INTERFACE_MODE_5GBASER:
			phylink_set(pl->supported, 5000baseT_Full);
			break;

		case PHY_INTERFACE_MODE_25GBASER:
			phylink_set(pl->supported, 25000baseCR_Full);
			phylink_set(pl->supported, 25000baseKR_Full);
			phylink_set(pl->supported, 25000baseSR_Full);
			fallthrough;
		case PHY_INTERFACE_MODE_USXGMII:
		case PHY_INTERFACE_MODE_10GKR:
		case PHY_INTERFACE_MODE_10GBASER:
			phylink_set(pl->supported, 10baseT_Half);
			phylink_set(pl->supported, 10baseT_Full);
			phylink_set(pl->supported, 100baseT_Half);
			phylink_set(pl->supported, 100baseT_Full);
			phylink_set(pl->supported, 1000baseT_Half);
			phylink_set(pl->supported, 1000baseT_Full);
			phylink_set(pl->supported, 1000baseX_Full);
			phylink_set(pl->supported, 1000baseKX_Full);
			phylink_set(pl->supported, 2500baseT_Full);
			phylink_set(pl->supported, 2500baseX_Full);
			phylink_set(pl->supported, 5000baseT_Full);
			phylink_set(pl->supported, 10000baseT_Full);
			phylink_set(pl->supported, 10000baseKR_Full);
			phylink_set(pl->supported, 10000baseKX4_Full);
			phylink_set(pl->supported, 10000baseCR_Full);
			phylink_set(pl->supported, 10000baseSR_Full);
			phylink_set(pl->supported, 10000baseLR_Full);
			phylink_set(pl->supported, 10000baseLRM_Full);
			phylink_set(pl->supported, 10000baseER_Full);
			break;

		case PHY_INTERFACE_MODE_XLGMII:
			phylink_set(pl->supported, 25000baseCR_Full);
			phylink_set(pl->supported, 25000baseKR_Full);
			phylink_set(pl->supported, 25000baseSR_Full);
			phylink_set(pl->supported, 40000baseKR4_Full);
			phylink_set(pl->supported, 40000baseCR4_Full);
			phylink_set(pl->supported, 40000baseSR4_Full);
			phylink_set(pl->supported, 40000baseLR4_Full);
			phylink_set(pl->supported, 50000baseCR2_Full);
			phylink_set(pl->supported, 50000baseKR2_Full);
			phylink_set(pl->supported, 50000baseSR2_Full);
			phylink_set(pl->supported, 50000baseKR_Full);
			phylink_set(pl->supported, 50000baseSR_Full);
			phylink_set(pl->supported, 50000baseCR_Full);
			phylink_set(pl->supported, 50000baseLR_ER_FR_Full);
			phylink_set(pl->supported, 50000baseDR_Full);
			phylink_set(pl->supported, 100000baseKR4_Full);
			phylink_set(pl->supported, 100000baseSR4_Full);
			phylink_set(pl->supported, 100000baseCR4_Full);
			phylink_set(pl->supported, 100000baseLR4_ER4_Full);
			phylink_set(pl->supported, 100000baseKR2_Full);
			phylink_set(pl->supported, 100000baseSR2_Full);
			phylink_set(pl->supported, 100000baseCR2_Full);
			phylink_set(pl->supported, 100000baseLR2_ER2_FR2_Full);
			phylink_set(pl->supported, 100000baseDR2_Full);
			break;

		default:
			phylink_err(pl,
				    "incorrect link mode %s for in-band status\n",
				    phy_modes(pl->link_config.interface));
			return -EINVAL;
		}

		linkmode_copy(pl->link_config.advertising, pl->supported);

		if (phylink_validate(pl, pl->supported, &pl->link_config)) {
			phylink_err(pl,
				    "failed to validate link configuration for in-band status\n");
			return -EINVAL;
		}

		/* Check if MAC/PCS also supports Autoneg. */
		pl->link_config.an_enabled = phylink_test(pl->supported, Autoneg);
	}

	return 0;
}

static void phylink_apply_manual_flow(struct phylink *pl,
				      struct phylink_link_state *state)
{
	/* If autoneg is disabled, pause AN is also disabled */
	if (!state->an_enabled)
		state->pause &= ~MLO_PAUSE_AN;

	/* Manual configuration of pause modes */
	if (!(pl->link_config.pause & MLO_PAUSE_AN))
		state->pause = pl->link_config.pause;
}

static void phylink_resolve_flow(struct phylink_link_state *state)
{
	bool tx_pause, rx_pause;

	state->pause = MLO_PAUSE_NONE;
	if (state->duplex == DUPLEX_FULL) {
		linkmode_resolve_pause(state->advertising,
				       state->lp_advertising,
				       &tx_pause, &rx_pause);
		if (tx_pause)
			state->pause |= MLO_PAUSE_TX;
		if (rx_pause)
			state->pause |= MLO_PAUSE_RX;
	}
}

static void phylink_mac_config(struct phylink *pl,
			       const struct phylink_link_state *state)
{
	phylink_dbg(pl,
		    "%s: mode=%s/%s/%s/%s adv=%*pb pause=%02x link=%u an=%u\n",
		    __func__, phylink_an_mode_str(pl->cur_link_an_mode),
		    phy_modes(state->interface),
		    phy_speed_to_str(state->speed),
		    phy_duplex_to_str(state->duplex),
		    __ETHTOOL_LINK_MODE_MASK_NBITS, state->advertising,
		    state->pause, state->link, state->an_enabled);

	pl->mac_ops->mac_config(pl->config, pl->cur_link_an_mode, state);
}

static void phylink_mac_pcs_an_restart(struct phylink *pl)
{
	if (pl->link_config.an_enabled &&
	    phy_interface_mode_is_8023z(pl->link_config.interface) &&
	    phylink_autoneg_inband(pl->cur_link_an_mode)) {
		if (pl->pcs_ops)
			pl->pcs_ops->pcs_an_restart(pl->pcs);
		else
			pl->mac_ops->mac_an_restart(pl->config);
	}
}

static void phylink_major_config(struct phylink *pl, bool restart,
				  const struct phylink_link_state *state)
{
	int err;

	phylink_dbg(pl, "major config %s\n", phy_modes(state->interface));

	if (pl->mac_ops->mac_prepare) {
		err = pl->mac_ops->mac_prepare(pl->config, pl->cur_link_an_mode,
					       state->interface);
		if (err < 0) {
			phylink_err(pl, "mac_prepare failed: %pe\n",
				    ERR_PTR(err));
			return;
		}
	}

	phylink_mac_config(pl, state);

	if (pl->pcs_ops) {
		err = pl->pcs_ops->pcs_config(pl->pcs, pl->cur_link_an_mode,
					      state->interface,
					      state->advertising,
					      !!(pl->link_config.pause &
						 MLO_PAUSE_AN));
		if (err < 0)
			phylink_err(pl, "pcs_config failed: %pe\n",
				    ERR_PTR(err));
		if (err > 0)
			restart = true;
	}
	if (restart)
		phylink_mac_pcs_an_restart(pl);

	if (pl->mac_ops->mac_finish) {
		err = pl->mac_ops->mac_finish(pl->config, pl->cur_link_an_mode,
					      state->interface);
		if (err < 0)
			phylink_err(pl, "mac_finish failed: %pe\n",
				    ERR_PTR(err));
	}
}

/*
 * Reconfigure for a change of inband advertisement.
 * If we have a separate PCS, we only need to call its pcs_config() method,
 * and then restart AN if it indicates something changed. Otherwise, we do
 * the full MAC reconfiguration.
 */
static int phylink_change_inband_advert(struct phylink *pl)
{
	int ret;

	if (test_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state))
		return 0;

	if (!pl->pcs_ops) {
		/* Legacy method */
		phylink_mac_config(pl, &pl->link_config);
		phylink_mac_pcs_an_restart(pl);
		return 0;
	}

	phylink_dbg(pl, "%s: mode=%s/%s adv=%*pb pause=%02x\n", __func__,
		    phylink_an_mode_str(pl->cur_link_an_mode),
		    phy_modes(pl->link_config.interface),
		    __ETHTOOL_LINK_MODE_MASK_NBITS, pl->link_config.advertising,
		    pl->link_config.pause);

	/* Modern PCS-based method; update the advert at the PCS, and
	 * restart negotiation if the pcs_config() helper indicates that
	 * the programmed advertisement has changed.
	 */
	ret = pl->pcs_ops->pcs_config(pl->pcs, pl->cur_link_an_mode,
				      pl->link_config.interface,
				      pl->link_config.advertising,
				      !!(pl->link_config.pause & MLO_PAUSE_AN));
	if (ret < 0)
		return ret;

	if (ret > 0)
		phylink_mac_pcs_an_restart(pl);

	return 0;
}

static void phylink_mac_pcs_get_state(struct phylink *pl,
				      struct phylink_link_state *state)
{
	linkmode_copy(state->advertising, pl->link_config.advertising);
	linkmode_zero(state->lp_advertising);
	state->interface = pl->link_config.interface;
	state->an_enabled = pl->link_config.an_enabled;
	state->speed = SPEED_UNKNOWN;
	state->duplex = DUPLEX_UNKNOWN;
	state->pause = MLO_PAUSE_NONE;
	state->an_complete = 0;
	state->link = 1;

	if (pl->pcs_ops)
		pl->pcs_ops->pcs_get_state(pl->pcs, state);
	else if (pl->mac_ops->mac_pcs_get_state)
		pl->mac_ops->mac_pcs_get_state(pl->config, state);
	else
		state->link = 0;
}

/* The fixed state is... fixed except for the link state,
 * which may be determined by a GPIO or a callback.
 */
static void phylink_get_fixed_state(struct phylink *pl,
				    struct phylink_link_state *state)
{
	*state = pl->link_config;
	if (pl->config->get_fixed_state)
		pl->config->get_fixed_state(pl->config, state);
	else if (pl->link_gpio)
		state->link = !!gpiod_get_value_cansleep(pl->link_gpio);

	phylink_resolve_flow(state);
}

static void phylink_mac_initial_config(struct phylink *pl, bool force_restart)
{
	struct phylink_link_state link_state;

	switch (pl->cur_link_an_mode) {
	case MLO_AN_PHY:
		link_state = pl->phy_state;
		break;

	case MLO_AN_FIXED:
		phylink_get_fixed_state(pl, &link_state);
		break;

	case MLO_AN_INBAND:
		link_state = pl->link_config;
		if (link_state.interface == PHY_INTERFACE_MODE_SGMII)
			link_state.pause = MLO_PAUSE_NONE;
		break;

	default: /* can't happen */
		return;
	}

	link_state.link = false;

	phylink_apply_manual_flow(pl, &link_state);
	phylink_major_config(pl, force_restart, &link_state);
}

static const char *phylink_pause_to_str(int pause)
{
	switch (pause & MLO_PAUSE_TXRX_MASK) {
	case MLO_PAUSE_TX | MLO_PAUSE_RX:
		return "rx/tx";
	case MLO_PAUSE_TX:
		return "tx";
	case MLO_PAUSE_RX:
		return "rx";
	default:
		return "off";
	}
}

static void phylink_link_up(struct phylink *pl,
			    struct phylink_link_state link_state)
{
	struct net_device *ndev = pl->netdev;

	pl->cur_interface = link_state.interface;

	if (pl->pcs_ops && pl->pcs_ops->pcs_link_up)
		pl->pcs_ops->pcs_link_up(pl->pcs, pl->cur_link_an_mode,
					 pl->cur_interface,
					 link_state.speed, link_state.duplex);

	pl->mac_ops->mac_link_up(pl->config, pl->phydev,
				 pl->cur_link_an_mode, pl->cur_interface,
				 link_state.speed, link_state.duplex,
				 !!(link_state.pause & MLO_PAUSE_TX),
				 !!(link_state.pause & MLO_PAUSE_RX));

	if (ndev)
		netif_carrier_on(ndev);

	phylink_info(pl,
		     "Link is Up - %s/%s - flow control %s\n",
		     phy_speed_to_str(link_state.speed),
		     phy_duplex_to_str(link_state.duplex),
		     phylink_pause_to_str(link_state.pause));
}

static void phylink_link_down(struct phylink *pl)
{
	struct net_device *ndev = pl->netdev;

	if (ndev)
		netif_carrier_off(ndev);
	pl->mac_ops->mac_link_down(pl->config, pl->cur_link_an_mode,
				   pl->cur_interface);
	phylink_info(pl, "Link is Down\n");
}

static void phylink_resolve(struct work_struct *w)
{
	struct phylink *pl = container_of(w, struct phylink, resolve);
	struct phylink_link_state link_state;
	struct net_device *ndev = pl->netdev;
	bool mac_config = false;
	bool cur_link_state;

	mutex_lock(&pl->state_mutex);
	if (pl->netdev)
		cur_link_state = netif_carrier_ok(ndev);
	else
		cur_link_state = pl->old_link_state;

	if (pl->phylink_disable_state) {
		pl->mac_link_dropped = false;
		link_state.link = false;
	} else if (pl->mac_link_dropped) {
		link_state.link = false;
	} else {
		switch (pl->cur_link_an_mode) {
		case MLO_AN_PHY:
			link_state = pl->phy_state;
			phylink_apply_manual_flow(pl, &link_state);
			mac_config = link_state.link;
			break;

		case MLO_AN_FIXED:
			phylink_get_fixed_state(pl, &link_state);
			mac_config = link_state.link;
			break;

		case MLO_AN_INBAND:
			phylink_mac_pcs_get_state(pl, &link_state);

			/* If we have a phy, the "up" state is the union of
			 * both the PHY and the MAC
			 */
			if (pl->phydev)
				link_state.link &= pl->phy_state.link;

			/* Only update if the PHY link is up */
			if (pl->phydev && pl->phy_state.link) {
				link_state.interface = pl->phy_state.interface;

				/* If we have a PHY, we need to update with
				 * the PHY flow control bits.
				 */
				link_state.pause = pl->phy_state.pause;
				mac_config = true;
			}
			phylink_apply_manual_flow(pl, &link_state);
			break;
		}
	}

	if (mac_config) {
		if (link_state.interface != pl->link_config.interface) {
			/* The interface has changed, force the link down and
			 * then reconfigure.
			 */
			if (cur_link_state) {
				phylink_link_down(pl);
				cur_link_state = false;
			}
			phylink_major_config(pl, false, &link_state);
			pl->link_config.interface = link_state.interface;
		} else if (!pl->pcs_ops) {
			/* The interface remains unchanged, only the speed,
			 * duplex or pause settings have changed. Call the
			 * old mac_config() method to configure the MAC/PCS
			 * only if we do not have a PCS installed (an
			 * unconverted user.)
			 */
			phylink_mac_config(pl, &link_state);
		}
	}

	if (link_state.link != cur_link_state) {
		pl->old_link_state = link_state.link;
		if (!link_state.link)
			phylink_link_down(pl);
		else
			phylink_link_up(pl, link_state);
	}
	if (!link_state.link && pl->mac_link_dropped) {
		pl->mac_link_dropped = false;
		queue_work(system_power_efficient_wq, &pl->resolve);
	}
	mutex_unlock(&pl->state_mutex);
}

static void phylink_run_resolve(struct phylink *pl)
{
	if (!pl->phylink_disable_state)
		queue_work(system_power_efficient_wq, &pl->resolve);
}

static void phylink_run_resolve_and_disable(struct phylink *pl, int bit)
{
	unsigned long state = pl->phylink_disable_state;

	set_bit(bit, &pl->phylink_disable_state);
	if (state == 0) {
		queue_work(system_power_efficient_wq, &pl->resolve);
		flush_work(&pl->resolve);
	}
}

static void phylink_fixed_poll(struct timer_list *t)
{
	struct phylink *pl = container_of(t, struct phylink, link_poll);

	mod_timer(t, jiffies + HZ);

	phylink_run_resolve(pl);
}

static const struct sfp_upstream_ops sfp_phylink_ops;

static int phylink_register_sfp(struct phylink *pl,
				struct fwnode_handle *fwnode)
{
	struct sfp_bus *bus;
	int ret;

	if (!fwnode)
		return 0;

	bus = sfp_bus_find_fwnode(fwnode);
	if (IS_ERR(bus)) {
		ret = PTR_ERR(bus);
		phylink_err(pl, "unable to attach SFP bus: %d\n", ret);
		return ret;
	}

	pl->sfp_bus = bus;

	ret = sfp_bus_add_upstream(bus, pl, &sfp_phylink_ops);
	sfp_bus_put(bus);

	return ret;
}

/**
 * phylink_create() - create a phylink instance
 * @config: a pointer to the target &struct phylink_config
 * @fwnode: a pointer to a &struct fwnode_handle describing the network
 *	interface
 * @iface: the desired link mode defined by &typedef phy_interface_t
 * @mac_ops: a pointer to a &struct phylink_mac_ops for the MAC.
 *
 * Create a new phylink instance, and parse the link parameters found in @np.
 * This will parse in-band modes, fixed-link or SFP configuration.
 *
 * Note: the rtnl lock must not be held when calling this function.
 *
 * Returns a pointer to a &struct phylink, or an error-pointer value. Users
 * must use IS_ERR() to check for errors from this function.
 */
struct phylink *phylink_create(struct phylink_config *config,
			       struct fwnode_handle *fwnode,
			       phy_interface_t iface,
			       const struct phylink_mac_ops *mac_ops)
{
	struct phylink *pl;
	int ret;

	pl = kzalloc(sizeof(*pl), GFP_KERNEL);
	if (!pl)
		return ERR_PTR(-ENOMEM);

	mutex_init(&pl->state_mutex);
	INIT_WORK(&pl->resolve, phylink_resolve);

	pl->config = config;
	if (config->type == PHYLINK_NETDEV) {
		pl->netdev = to_net_dev(config->dev);
	} else if (config->type == PHYLINK_DEV) {
		pl->dev = config->dev;
	} else {
		kfree(pl);
		return ERR_PTR(-EINVAL);
	}

	pl->phy_state.interface = iface;
	pl->link_interface = iface;
	if (iface == PHY_INTERFACE_MODE_MOCA)
		pl->link_port = PORT_BNC;
	else
		pl->link_port = PORT_MII;
	pl->link_config.interface = iface;
	pl->link_config.pause = MLO_PAUSE_AN;
	pl->link_config.speed = SPEED_UNKNOWN;
	pl->link_config.duplex = DUPLEX_UNKNOWN;
	pl->link_config.an_enabled = true;
	pl->mac_ops = mac_ops;
	__set_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
	timer_setup(&pl->link_poll, phylink_fixed_poll, 0);

	bitmap_fill(pl->supported, __ETHTOOL_LINK_MODE_MASK_NBITS);
	linkmode_copy(pl->link_config.advertising, pl->supported);
	phylink_validate(pl, pl->supported, &pl->link_config);

	ret = phylink_parse_mode(pl, fwnode);
	if (ret < 0) {
		kfree(pl);
		return ERR_PTR(ret);
	}

	if (pl->cfg_link_an_mode == MLO_AN_FIXED) {
		ret = phylink_parse_fixedlink(pl, fwnode);
		if (ret < 0) {
			kfree(pl);
			return ERR_PTR(ret);
		}
	}

	pl->cur_link_an_mode = pl->cfg_link_an_mode;

	ret = phylink_register_sfp(pl, fwnode);
	if (ret < 0) {
		kfree(pl);
		return ERR_PTR(ret);
	}

	return pl;
}
EXPORT_SYMBOL_GPL(phylink_create);

/**
 * phylink_set_pcs() - set the current PCS for phylink to use
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @pcs: a pointer to the &struct phylink_pcs
 *
 * Bind the MAC PCS to phylink.  This may be called after phylink_create(),
 * in mac_prepare() or mac_config() methods if it is desired to dynamically
 * change the PCS.
 *
 * Please note that there are behavioural changes with the mac_config()
 * callback if a PCS is present (denoting a newer setup) so removing a PCS
 * is not supported, and if a PCS is going to be used, it must be registered
 * by calling phylink_set_pcs() at the latest in the first mac_config() call.
 */
void phylink_set_pcs(struct phylink *pl, struct phylink_pcs *pcs)
{
	pl->pcs = pcs;
	pl->pcs_ops = pcs->ops;
}
EXPORT_SYMBOL_GPL(phylink_set_pcs);

/**
 * phylink_destroy() - cleanup and destroy the phylink instance
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 *
 * Destroy a phylink instance. Any PHY that has been attached must have been
 * cleaned up via phylink_disconnect_phy() prior to calling this function.
 *
 * Note: the rtnl lock must not be held when calling this function.
 */
void phylink_destroy(struct phylink *pl)
{
	sfp_bus_del_upstream(pl->sfp_bus);
	if (pl->link_gpio)
		gpiod_put(pl->link_gpio);

	cancel_work_sync(&pl->resolve);
	kfree(pl);
}
EXPORT_SYMBOL_GPL(phylink_destroy);

static void phylink_phy_change(struct phy_device *phydev, bool up)
{
	struct phylink *pl = phydev->phylink;
	bool tx_pause, rx_pause;

	phy_get_pause(phydev, &tx_pause, &rx_pause);

	mutex_lock(&pl->state_mutex);
	pl->phy_state.speed = phydev->speed;
	pl->phy_state.duplex = phydev->duplex;
	pl->phy_state.pause = MLO_PAUSE_NONE;
	if (tx_pause)
		pl->phy_state.pause |= MLO_PAUSE_TX;
	if (rx_pause)
		pl->phy_state.pause |= MLO_PAUSE_RX;
	pl->phy_state.interface = phydev->interface;
	pl->phy_state.link = up;
	mutex_unlock(&pl->state_mutex);

	phylink_run_resolve(pl);

	phylink_dbg(pl, "phy link %s %s/%s/%s\n", up ? "up" : "down",
		    phy_modes(phydev->interface),
		    phy_speed_to_str(phydev->speed),
		    phy_duplex_to_str(phydev->duplex));
}

static int phylink_bringup_phy(struct phylink *pl, struct phy_device *phy,
			       phy_interface_t interface)
{
	struct phylink_link_state config;
	__ETHTOOL_DECLARE_LINK_MODE_MASK(supported);
	char *irq_str;
	int ret;

	/*
	 * This is the new way of dealing with flow control for PHYs,
	 * as described by Timur Tabi in commit 529ed1275263 ("net: phy:
	 * phy drivers should not set SUPPORTED_[Asym_]Pause") except
	 * using our validate call to the MAC, we rely upon the MAC
	 * clearing the bits from both supported and advertising fields.
	 */
	phy_support_asym_pause(phy);

	memset(&config, 0, sizeof(config));
	linkmode_copy(supported, phy->supported);
	linkmode_copy(config.advertising, phy->advertising);

	/* Clause 45 PHYs switch their Serdes lane between several different
	 * modes, normally 10GBASE-R, SGMII. Some use 2500BASE-X for 2.5G
	 * speeds. We really need to know which interface modes the PHY and
	 * MAC supports to properly work out which linkmodes can be supported.
	 */
	if (phy->is_c45 &&
	    interface != PHY_INTERFACE_MODE_RXAUI &&
	    interface != PHY_INTERFACE_MODE_XAUI &&
	    interface != PHY_INTERFACE_MODE_USXGMII)
		config.interface = PHY_INTERFACE_MODE_NA;
	else
		config.interface = interface;

	ret = phylink_validate(pl, supported, &config);
	if (ret) {
		phylink_warn(pl, "validation of %s with support %*pb and advertisement %*pb failed: %d\n",
			     phy_modes(config.interface),
			     __ETHTOOL_LINK_MODE_MASK_NBITS, phy->supported,
			     __ETHTOOL_LINK_MODE_MASK_NBITS, config.advertising,
			     ret);
		return ret;
	}

	phy->phylink = pl;
	phy->phy_link_change = phylink_phy_change;

	irq_str = phy_attached_info_irq(phy);
	phylink_info(pl,
		     "PHY [%s] driver [%s] (irq=%s)\n",
		     dev_name(&phy->mdio.dev), phy->drv->name, irq_str);
	kfree(irq_str);

	mutex_lock(&phy->lock);
	mutex_lock(&pl->state_mutex);
	pl->phydev = phy;
	pl->phy_state.interface = interface;
	pl->phy_state.pause = MLO_PAUSE_NONE;
	pl->phy_state.speed = SPEED_UNKNOWN;
	pl->phy_state.duplex = DUPLEX_UNKNOWN;
	linkmode_copy(pl->supported, supported);
	linkmode_copy(pl->link_config.advertising, config.advertising);

	/* Restrict the phy advertisement according to the MAC support. */
	linkmode_copy(phy->advertising, config.advertising);
	mutex_unlock(&pl->state_mutex);
	mutex_unlock(&phy->lock);

	phylink_dbg(pl,
		    "phy: setting supported %*pb advertising %*pb\n",
		    __ETHTOOL_LINK_MODE_MASK_NBITS, pl->supported,
		    __ETHTOOL_LINK_MODE_MASK_NBITS, phy->advertising);

	if (phy_interrupt_is_valid(phy))
		phy_request_interrupt(phy);

	return 0;
}

static int phylink_attach_phy(struct phylink *pl, struct phy_device *phy,
			      phy_interface_t interface)
{
	if (WARN_ON(pl->cfg_link_an_mode == MLO_AN_FIXED ||
		    (pl->cfg_link_an_mode == MLO_AN_INBAND &&
		     phy_interface_mode_is_8023z(interface))))
		return -EINVAL;

	if (pl->phydev)
		return -EBUSY;

	return phy_attach_direct(pl->netdev, phy, 0, interface);
}

/**
 * phylink_connect_phy() - connect a PHY to the phylink instance
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @phy: a pointer to a &struct phy_device.
 *
 * Connect @phy to the phylink instance specified by @pl by calling
 * phy_attach_direct(). Configure the @phy according to the MAC driver's
 * capabilities, start the PHYLIB state machine and enable any interrupts
 * that the PHY supports.
 *
 * This updates the phylink's ethtool supported and advertising link mode
 * masks.
 *
 * Returns 0 on success or a negative errno.
 */
int phylink_connect_phy(struct phylink *pl, struct phy_device *phy)
{
	int ret;

	/* Use PHY device/driver interface */
	if (pl->link_interface == PHY_INTERFACE_MODE_NA) {
		pl->link_interface = phy->interface;
		pl->link_config.interface = pl->link_interface;
	}

	ret = phylink_attach_phy(pl, phy, pl->link_interface);
	if (ret < 0)
		return ret;

	ret = phylink_bringup_phy(pl, phy, pl->link_config.interface);
	if (ret)
		phy_detach(phy);

	return ret;
}
EXPORT_SYMBOL_GPL(phylink_connect_phy);

/**
 * phylink_of_phy_connect() - connect the PHY specified in the DT mode.
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @dn: a pointer to a &struct device_node.
 * @flags: PHY-specific flags to communicate to the PHY device driver
 *
 * Connect the phy specified in the device node @dn to the phylink instance
 * specified by @pl. Actions specified in phylink_connect_phy() will be
 * performed.
 *
 * Returns 0 on success or a negative errno.
 */
int phylink_of_phy_connect(struct phylink *pl, struct device_node *dn,
			   u32 flags)
{
	return phylink_fwnode_phy_connect(pl, of_fwnode_handle(dn), flags);
}
EXPORT_SYMBOL_GPL(phylink_of_phy_connect);

/**
 * phylink_fwnode_phy_connect() - connect the PHY specified in the fwnode.
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @fwnode: a pointer to a &struct fwnode_handle.
 * @flags: PHY-specific flags to communicate to the PHY device driver
 *
 * Connect the phy specified @fwnode to the phylink instance specified
 * by @pl.
 *
 * Returns 0 on success or a negative errno.
 */
int phylink_fwnode_phy_connect(struct phylink *pl,
			       struct fwnode_handle *fwnode,
			       u32 flags)
{
	struct fwnode_handle *phy_fwnode;
	struct phy_device *phy_dev;
	int ret;

	/* Fixed links and 802.3z are handled without needing a PHY */
	if (pl->cfg_link_an_mode == MLO_AN_FIXED ||
	    (pl->cfg_link_an_mode == MLO_AN_INBAND &&
	     phy_interface_mode_is_8023z(pl->link_interface)))
		return 0;

	phy_fwnode = fwnode_get_phy_node(fwnode);
	if (IS_ERR(phy_fwnode)) {
		if (pl->cfg_link_an_mode == MLO_AN_PHY)
			return -ENODEV;
		return 0;
	}

	phy_dev = fwnode_phy_find_device(phy_fwnode);
	/* We're done with the phy_node handle */
	fwnode_handle_put(phy_fwnode);
	if (!phy_dev)
		return -ENODEV;

	ret = phy_attach_direct(pl->netdev, phy_dev, flags,
				pl->link_interface);
	if (ret) {
		phy_device_free(phy_dev);
		return ret;
	}

	ret = phylink_bringup_phy(pl, phy_dev, pl->link_config.interface);
	if (ret)
		phy_detach(phy_dev);

	return ret;
}
EXPORT_SYMBOL_GPL(phylink_fwnode_phy_connect);

/**
 * phylink_disconnect_phy() - disconnect any PHY attached to the phylink
 *   instance.
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 *
 * Disconnect any current PHY from the phylink instance described by @pl.
 */
void phylink_disconnect_phy(struct phylink *pl)
{
	struct phy_device *phy;

	ASSERT_RTNL();

	phy = pl->phydev;
	if (phy) {
		mutex_lock(&phy->lock);
		mutex_lock(&pl->state_mutex);
		pl->phydev = NULL;
		mutex_unlock(&pl->state_mutex);
		mutex_unlock(&phy->lock);
		flush_work(&pl->resolve);

		phy_disconnect(phy);
	}
}
EXPORT_SYMBOL_GPL(phylink_disconnect_phy);

/**
 * phylink_mac_change() - notify phylink of a change in MAC state
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @up: indicates whether the link is currently up.
 *
 * The MAC driver should call this driver when the state of its link
 * changes (eg, link failure, new negotiation results, etc.)
 */
void phylink_mac_change(struct phylink *pl, bool up)
{
	if (!up)
		pl->mac_link_dropped = true;
	phylink_run_resolve(pl);
	phylink_dbg(pl, "mac link %s\n", up ? "up" : "down");
}
EXPORT_SYMBOL_GPL(phylink_mac_change);

static irqreturn_t phylink_link_handler(int irq, void *data)
{
	struct phylink *pl = data;

	phylink_run_resolve(pl);

	return IRQ_HANDLED;
}

/**
 * phylink_start() - start a phylink instance
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 *
 * Start the phylink instance specified by @pl, configuring the MAC for the
 * desired link mode(s) and negotiation style. This should be called from the
 * network device driver's &struct net_device_ops ndo_open() method.
 */
void phylink_start(struct phylink *pl)
{
	bool poll = false;

	ASSERT_RTNL();

	phylink_info(pl, "configuring for %s/%s link mode\n",
		     phylink_an_mode_str(pl->cur_link_an_mode),
		     phy_modes(pl->link_config.interface));

	/* Always set the carrier off */
	if (pl->netdev)
		netif_carrier_off(pl->netdev);

	/* Apply the link configuration to the MAC when starting. This allows
	 * a fixed-link to start with the correct parameters, and also
	 * ensures that we set the appropriate advertisement for Serdes links.
	 *
	 * Restart autonegotiation if using 802.3z to ensure that the link
	 * parameters are properly negotiated.  This is necessary for DSA
	 * switches using 802.3z negotiation to ensure they see our modes.
	 */
	phylink_mac_initial_config(pl, true);

	clear_bit(PHYLINK_DISABLE_STOPPED, &pl->phylink_disable_state);
	phylink_run_resolve(pl);

	if (pl->cfg_link_an_mode == MLO_AN_FIXED && pl->link_gpio) {
		int irq = gpiod_to_irq(pl->link_gpio);

		if (irq > 0) {
			if (!request_irq(irq, phylink_link_handler,
					 IRQF_TRIGGER_RISING |
					 IRQF_TRIGGER_FALLING,
					 "netdev link", pl))
				pl->link_irq = irq;
			else
				irq = 0;
		}
		if (irq <= 0)
			poll = true;
	}

	switch (pl->cfg_link_an_mode) {
	case MLO_AN_FIXED:
		poll |= pl->config->poll_fixed_state;
		break;
	case MLO_AN_INBAND:
		poll |= pl->config->pcs_poll;
		if (pl->pcs)
			poll |= pl->pcs->poll;
		break;
	}
	if (poll)
		mod_timer(&pl->link_poll, jiffies + HZ);
	if (pl->phydev)
		phy_start(pl->phydev);
	if (pl->sfp_bus)
		sfp_upstream_start(pl->sfp_bus);
}
EXPORT_SYMBOL_GPL(phylink_start);

/**
 * phylink_stop() - stop a phylink instance
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 *
 * Stop the phylink instance specified by @pl. This should be called from the
 * network device driver's &struct net_device_ops ndo_stop() method.  The
 * network device's carrier state should not be changed prior to calling this
 * function.
 *
 * This will synchronously bring down the link if the link is not already
 * down (in other words, it will trigger a mac_link_down() method call.)
 */
void phylink_stop(struct phylink *pl)
{
	ASSERT_RTNL();

	if (pl->sfp_bus)
		sfp_upstream_stop(pl->sfp_bus);
	if (pl->phydev)
		phy_stop(pl->phydev);
	del_timer_sync(&pl->link_poll);
	if (pl->link_irq) {
		free_irq(pl->link_irq, pl);
		pl->link_irq = 0;
	}

	phylink_run_resolve_and_disable(pl, PHYLINK_DISABLE_STOPPED);
}
EXPORT_SYMBOL_GPL(phylink_stop);

/**
 * phylink_suspend() - handle a network device suspend event
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @mac_wol: true if the MAC needs to receive packets for Wake-on-Lan
 *
 * Handle a network device suspend event. There are several cases:
 * - If Wake-on-Lan is not active, we can bring down the link between
 *   the MAC and PHY by calling phylink_stop().
 * - If Wake-on-Lan is active, and being handled only by the PHY, we
 *   can also bring down the link between the MAC and PHY.
 * - If Wake-on-Lan is active, but being handled by the MAC, the MAC
 *   still needs to receive packets, so we can not bring the link down.
 */
void phylink_suspend(struct phylink *pl, bool mac_wol)
{
	ASSERT_RTNL();

	if (mac_wol && (!pl->netdev || pl->netdev->wol_enabled)) {
		/* Wake-on-Lan enabled, MAC handling */
		mutex_lock(&pl->state_mutex);

		/* Stop the resolver bringing the link up */
		__set_bit(PHYLINK_DISABLE_MAC_WOL, &pl->phylink_disable_state);

		/* Disable the carrier, to prevent transmit timeouts,
		 * but one would hope all packets have been sent. This
		 * also means phylink_resolve() will do nothing.
		 */
		netif_carrier_off(pl->netdev);

		/* We do not call mac_link_down() here as we want the
		 * link to remain up to receive the WoL packets.
		 */
		mutex_unlock(&pl->state_mutex);
	} else {
		phylink_stop(pl);
	}
}
EXPORT_SYMBOL_GPL(phylink_suspend);

/**
 * phylink_resume() - handle a network device resume event
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 *
 * Undo the effects of phylink_suspend(), returning the link to an
 * operational state.
 */
void phylink_resume(struct phylink *pl)
{
	ASSERT_RTNL();

	if (test_bit(PHYLINK_DISABLE_MAC_WOL, &pl->phylink_disable_state)) {
		/* Wake-on-Lan enabled, MAC handling */

		/* Call mac_link_down() so we keep the overall state balanced.
		 * Do this under the state_mutex lock for consistency. This
		 * will cause a "Link Down" message to be printed during
		 * resume, which is harmless - the true link state will be
		 * printed when we run a resolve.
		 */
		mutex_lock(&pl->state_mutex);
		phylink_link_down(pl);
		mutex_unlock(&pl->state_mutex);

		/* Re-apply the link parameters so that all the settings get
		 * restored to the MAC.
		 */
		phylink_mac_initial_config(pl, true);

		/* Re-enable and re-resolve the link parameters */
		clear_bit(PHYLINK_DISABLE_MAC_WOL, &pl->phylink_disable_state);
		phylink_run_resolve(pl);
	} else {
		phylink_start(pl);
	}
}
EXPORT_SYMBOL_GPL(phylink_resume);

/**
 * phylink_ethtool_get_wol() - get the wake on lan parameters for the PHY
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @wol: a pointer to &struct ethtool_wolinfo to hold the read parameters
 *
 * Read the wake on lan parameters from the PHY attached to the phylink
 * instance specified by @pl. If no PHY is currently attached, report no
 * support for wake on lan.
 */
void phylink_ethtool_get_wol(struct phylink *pl, struct ethtool_wolinfo *wol)
{
	ASSERT_RTNL();

	wol->supported = 0;
	wol->wolopts = 0;

	if (pl->phydev)
		phy_ethtool_get_wol(pl->phydev, wol);
}
EXPORT_SYMBOL_GPL(phylink_ethtool_get_wol);

/**
 * phylink_ethtool_set_wol() - set wake on lan parameters
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @wol: a pointer to &struct ethtool_wolinfo for the desired parameters
 *
 * Set the wake on lan parameters for the PHY attached to the phylink
 * instance specified by @pl. If no PHY is attached, returns %EOPNOTSUPP
 * error.
 *
 * Returns zero on success or negative errno code.
 */
int phylink_ethtool_set_wol(struct phylink *pl, struct ethtool_wolinfo *wol)
{
	int ret = -EOPNOTSUPP;

	ASSERT_RTNL();

	if (pl->phydev)
		ret = phy_ethtool_set_wol(pl->phydev, wol);

	return ret;
}
EXPORT_SYMBOL_GPL(phylink_ethtool_set_wol);

static void phylink_merge_link_mode(unsigned long *dst, const unsigned long *b)
{
	__ETHTOOL_DECLARE_LINK_MODE_MASK(mask);

	linkmode_zero(mask);
	phylink_set_port_modes(mask);

	linkmode_and(dst, dst, mask);
	linkmode_or(dst, dst, b);
}

static void phylink_get_ksettings(const struct phylink_link_state *state,
				  struct ethtool_link_ksettings *kset)
{
	phylink_merge_link_mode(kset->link_modes.advertising, state->advertising);
	linkmode_copy(kset->link_modes.lp_advertising, state->lp_advertising);
	kset->base.speed = state->speed;
	kset->base.duplex = state->duplex;
	kset->base.autoneg = state->an_enabled ? AUTONEG_ENABLE :
				AUTONEG_DISABLE;
}

/**
 * phylink_ethtool_ksettings_get() - get the current link settings
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @kset: a pointer to a &struct ethtool_link_ksettings to hold link settings
 *
 * Read the current link settings for the phylink instance specified by @pl.
 * This will be the link settings read from the MAC, PHY or fixed link
 * settings depending on the current negotiation mode.
 */
int phylink_ethtool_ksettings_get(struct phylink *pl,
				  struct ethtool_link_ksettings *kset)
{
	struct phylink_link_state link_state;

	ASSERT_RTNL();

	if (pl->phydev)
		phy_ethtool_ksettings_get(pl->phydev, kset);
	else
		kset->base.port = pl->link_port;

	linkmode_copy(kset->link_modes.supported, pl->supported);

	switch (pl->cur_link_an_mode) {
	case MLO_AN_FIXED:
		/* We are using fixed settings. Report these as the
		 * current link settings - and note that these also
		 * represent the supported speeds/duplex/pause modes.
		 */
		phylink_get_fixed_state(pl, &link_state);
		phylink_get_ksettings(&link_state, kset);
		break;

	case MLO_AN_INBAND:
		/* If there is a phy attached, then use the reported
		 * settings from the phy with no modification.
		 */
		if (pl->phydev)
			break;

		phylink_mac_pcs_get_state(pl, &link_state);

		/* The MAC is reporting the link results from its own PCS
		 * layer via in-band status. Report these as the current
		 * link settings.
		 */
		phylink_get_ksettings(&link_state, kset);
		break;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(phylink_ethtool_ksettings_get);

/**
 * phylink_ethtool_ksettings_set() - set the link settings
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @kset: a pointer to a &struct ethtool_link_ksettings for the desired modes
 */
int phylink_ethtool_ksettings_set(struct phylink *pl,
				  const struct ethtool_link_ksettings *kset)
{
	__ETHTOOL_DECLARE_LINK_MODE_MASK(support);
	struct phylink_link_state config;
	const struct phy_setting *s;

	ASSERT_RTNL();

	if (pl->phydev) {
		/* We can rely on phylib for this update; we also do not need
		 * to update the pl->link_config settings:
		 * - the configuration returned via ksettings_get() will come
		 *   from phylib whenever a PHY is present.
		 * - link_config.interface will be updated by the PHY calling
		 *   back via phylink_phy_change() and a subsequent resolve.
		 * - initial link configuration for PHY mode comes from the
		 *   last phy state updated via phylink_phy_change().
		 * - other configuration changes (e.g. pause modes) are
		 *   performed directly via phylib.
		 * - if in in-band mode with a PHY, the link configuration
		 *   is passed on the link from the PHY, and all of
		 *   link_config.{speed,duplex,an_enabled,pause} are not used.
		 * - the only possible use would be link_config.advertising
		 *   pause modes when in 1000base-X mode with a PHY, but in
		 *   the presence of a PHY, this should not be changed as that
		 *   should be determined from the media side advertisement.
		 */
		return phy_ethtool_ksettings_set(pl->phydev, kset);
	}

	linkmode_copy(support, pl->supported);
	config = pl->link_config;
	config.an_enabled = kset->base.autoneg == AUTONEG_ENABLE;

	/* Mask out unsupported advertisements, and force the autoneg bit */
	linkmode_and(config.advertising, kset->link_modes.advertising,
		     support);
	linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, config.advertising,
			 config.an_enabled);

	/* FIXME: should we reject autoneg if phy/mac does not support it? */
	switch (kset->base.autoneg) {
	case AUTONEG_DISABLE:
		/* Autonegotiation disabled, select a suitable speed and
		 * duplex.
		 */
		s = phy_lookup_setting(kset->base.speed, kset->base.duplex,
				       support, false);
		if (!s)
			return -EINVAL;

		/* If we have a fixed link, refuse to change link parameters.
		 * If the link parameters match, accept them but do nothing.
		 */
		if (pl->cur_link_an_mode == MLO_AN_FIXED) {
			if (s->speed != pl->link_config.speed ||
			    s->duplex != pl->link_config.duplex)
				return -EINVAL;
			return 0;
		}

		config.speed = s->speed;
		config.duplex = s->duplex;
		break;

	case AUTONEG_ENABLE:
		/* If we have a fixed link, allow autonegotiation (since that
		 * is our default case) but do not allow the advertisement to
		 * be changed. If the advertisement matches, simply return.
		 */
		if (pl->cur_link_an_mode == MLO_AN_FIXED) {
			if (!linkmode_equal(config.advertising,
					    pl->link_config.advertising))
				return -EINVAL;
			return 0;
		}

		config.speed = SPEED_UNKNOWN;
		config.duplex = DUPLEX_UNKNOWN;
		break;

	default:
		return -EINVAL;
	}

	/* We have ruled out the case with a PHY attached, and the
	 * fixed-link cases.  All that is left are in-band links.
	 */
	if (phylink_validate(pl, support, &config))
		return -EINVAL;

	/* If autonegotiation is enabled, we must have an advertisement */
	if (config.an_enabled && phylink_is_empty_linkmode(config.advertising))
		return -EINVAL;

	mutex_lock(&pl->state_mutex);
	pl->link_config.speed = config.speed;
	pl->link_config.duplex = config.duplex;
	pl->link_config.an_enabled = config.an_enabled;

	if (pl->link_config.interface != config.interface) {
		/* The interface changed, e.g. 1000base-X <-> 2500base-X */
		/* We need to force the link down, then change the interface */
		if (pl->old_link_state) {
			phylink_link_down(pl);
			pl->old_link_state = false;
		}
		if (!test_bit(PHYLINK_DISABLE_STOPPED,
			      &pl->phylink_disable_state))
			phylink_major_config(pl, false, &config);
		pl->link_config.interface = config.interface;
		linkmode_copy(pl->link_config.advertising, config.advertising);
	} else if (!linkmode_equal(pl->link_config.advertising,
				   config.advertising)) {
		linkmode_copy(pl->link_config.advertising, config.advertising);
		phylink_change_inband_advert(pl);
	}
	mutex_unlock(&pl->state_mutex);

	return 0;
}
EXPORT_SYMBOL_GPL(phylink_ethtool_ksettings_set);

/**
 * phylink_ethtool_nway_reset() - restart negotiation
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 *
 * Restart negotiation for the phylink instance specified by @pl. This will
 * cause any attached phy to restart negotiation with the link partner, and
 * if the MAC is in a BaseX mode, the MAC will also be requested to restart
 * negotiation.
 *
 * Returns zero on success, or negative error code.
 */
int phylink_ethtool_nway_reset(struct phylink *pl)
{
	int ret = 0;

	ASSERT_RTNL();

	if (pl->phydev)
		ret = phy_restart_aneg(pl->phydev);
	phylink_mac_pcs_an_restart(pl);

	return ret;
}
EXPORT_SYMBOL_GPL(phylink_ethtool_nway_reset);

/**
 * phylink_ethtool_get_pauseparam() - get the current pause parameters
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @pause: a pointer to a &struct ethtool_pauseparam
 */
void phylink_ethtool_get_pauseparam(struct phylink *pl,
				    struct ethtool_pauseparam *pause)
{
	ASSERT_RTNL();

	pause->autoneg = !!(pl->link_config.pause & MLO_PAUSE_AN);
	pause->rx_pause = !!(pl->link_config.pause & MLO_PAUSE_RX);
	pause->tx_pause = !!(pl->link_config.pause & MLO_PAUSE_TX);
}
EXPORT_SYMBOL_GPL(phylink_ethtool_get_pauseparam);

/**
 * phylink_ethtool_set_pauseparam() - set the current pause parameters
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @pause: a pointer to a &struct ethtool_pauseparam
 */
int phylink_ethtool_set_pauseparam(struct phylink *pl,
				   struct ethtool_pauseparam *pause)
{
	struct phylink_link_state *config = &pl->link_config;
	bool manual_changed;
	int pause_state;

	ASSERT_RTNL();

	if (pl->cur_link_an_mode == MLO_AN_FIXED)
		return -EOPNOTSUPP;

	if (!phylink_test(pl->supported, Pause) &&
	    !phylink_test(pl->supported, Asym_Pause))
		return -EOPNOTSUPP;

	if (!phylink_test(pl->supported, Asym_Pause) &&
	    !pause->autoneg && pause->rx_pause != pause->tx_pause)
		return -EINVAL;

	pause_state = 0;
	if (pause->autoneg)
		pause_state |= MLO_PAUSE_AN;
	if (pause->rx_pause)
		pause_state |= MLO_PAUSE_RX;
	if (pause->tx_pause)
		pause_state |= MLO_PAUSE_TX;

	mutex_lock(&pl->state_mutex);
	/*
	 * See the comments for linkmode_set_pause(), wrt the deficiencies
	 * with the current implementation.  A solution to this issue would
	 * be:
	 * ethtool  Local device
	 *  rx  tx  Pause AsymDir
	 *  0   0   0     0
	 *  1   0   1     1
	 *  0   1   0     1
	 *  1   1   1     1
	 * and then use the ethtool rx/tx enablement status to mask the
	 * rx/tx pause resolution.
	 */
	linkmode_set_pause(config->advertising, pause->tx_pause,
			   pause->rx_pause);

	manual_changed = (config->pause ^ pause_state) & MLO_PAUSE_AN ||
			 (!(pause_state & MLO_PAUSE_AN) &&
			   (config->pause ^ pause_state) & MLO_PAUSE_TXRX_MASK);

	config->pause = pause_state;

	/* Update our in-band advertisement, triggering a renegotiation if
	 * the advertisement changed.
	 */
	if (!pl->phydev)
		phylink_change_inband_advert(pl);

	mutex_unlock(&pl->state_mutex);

	/* If we have a PHY, a change of the pause frame advertisement will
	 * cause phylib to renegotiate (if AN is enabled) which will in turn
	 * call our phylink_phy_change() and trigger a resolve.  Note that
	 * we can't hold our state mutex while calling phy_set_asym_pause().
	 */
	if (pl->phydev)
		phy_set_asym_pause(pl->phydev, pause->rx_pause,
				   pause->tx_pause);

	/* If the manual pause settings changed, make sure we trigger a
	 * resolve to update their state; we can not guarantee that the
	 * link will cycle.
	 */
	if (manual_changed) {
		pl->mac_link_dropped = true;
		phylink_run_resolve(pl);
	}

	return 0;
}
EXPORT_SYMBOL_GPL(phylink_ethtool_set_pauseparam);

/**
 * phylink_get_eee_err() - read the energy efficient ethernet error
 *   counter
 * @pl: a pointer to a &struct phylink returned from phylink_create().
 *
 * Read the Energy Efficient Ethernet error counter from the PHY associated
 * with the phylink instance specified by @pl.
 *
 * Returns positive error counter value, or negative error code.
 */
int phylink_get_eee_err(struct phylink *pl)
{
	int ret = 0;

	ASSERT_RTNL();

	if (pl->phydev)
		ret = phy_get_eee_err(pl->phydev);

	return ret;
}
EXPORT_SYMBOL_GPL(phylink_get_eee_err);

/**
 * phylink_init_eee() - init and check the EEE features
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @clk_stop_enable: allow PHY to stop receive clock
 *
 * Must be called either with RTNL held or within mac_link_up()
 */
int phylink_init_eee(struct phylink *pl, bool clk_stop_enable)
{
	int ret = -EOPNOTSUPP;

	if (pl->phydev)
		ret = phy_init_eee(pl->phydev, clk_stop_enable);

	return ret;
}
EXPORT_SYMBOL_GPL(phylink_init_eee);

/**
 * phylink_ethtool_get_eee() - read the energy efficient ethernet parameters
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @eee: a pointer to a &struct ethtool_eee for the read parameters
 */
int phylink_ethtool_get_eee(struct phylink *pl, struct ethtool_eee *eee)
{
	int ret = -EOPNOTSUPP;

	ASSERT_RTNL();

	if (pl->phydev)
		ret = phy_ethtool_get_eee(pl->phydev, eee);

	return ret;
}
EXPORT_SYMBOL_GPL(phylink_ethtool_get_eee);

/**
 * phylink_ethtool_set_eee() - set the energy efficient ethernet parameters
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @eee: a pointer to a &struct ethtool_eee for the desired parameters
 */
int phylink_ethtool_set_eee(struct phylink *pl, struct ethtool_eee *eee)
{
	int ret = -EOPNOTSUPP;

	ASSERT_RTNL();

	if (pl->phydev)
		ret = phy_ethtool_set_eee(pl->phydev, eee);

	return ret;
}
EXPORT_SYMBOL_GPL(phylink_ethtool_set_eee);

/* This emulates MII registers for a fixed-mode phy operating as per the
 * passed in state. "aneg" defines if we report negotiation is possible.
 *
 * FIXME: should deal with negotiation state too.
 */
static int phylink_mii_emul_read(unsigned int reg,
				 struct phylink_link_state *state)
{
	struct fixed_phy_status fs;
	unsigned long *lpa = state->lp_advertising;
	int val;

	fs.link = state->link;
	fs.speed = state->speed;
	fs.duplex = state->duplex;
	fs.pause = test_bit(ETHTOOL_LINK_MODE_Pause_BIT, lpa);
	fs.asym_pause = test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, lpa);

	val = swphy_read_reg(reg, &fs);
	if (reg == MII_BMSR) {
		if (!state->an_complete)
			val &= ~BMSR_ANEGCOMPLETE;
	}
	return val;
}

static int phylink_phy_read(struct phylink *pl, unsigned int phy_id,
			    unsigned int reg)
{
	struct phy_device *phydev = pl->phydev;
	int prtad, devad;

	if (mdio_phy_id_is_c45(phy_id)) {
		prtad = mdio_phy_id_prtad(phy_id);
		devad = mdio_phy_id_devad(phy_id);
		devad = mdiobus_c45_addr(devad, reg);
	} else if (phydev->is_c45) {
		switch (reg) {
		case MII_BMCR:
		case MII_BMSR:
		case MII_PHYSID1:
		case MII_PHYSID2:
			devad = __ffs(phydev->c45_ids.mmds_present);
			break;
		case MII_ADVERTISE:
		case MII_LPA:
			if (!(phydev->c45_ids.mmds_present & MDIO_DEVS_AN))
				return -EINVAL;
			devad = MDIO_MMD_AN;
			if (reg == MII_ADVERTISE)
				reg = MDIO_AN_ADVERTISE;
			else
				reg = MDIO_AN_LPA;
			break;
		default:
			return -EINVAL;
		}
		prtad = phy_id;
		devad = mdiobus_c45_addr(devad, reg);
	} else {
		prtad = phy_id;
		devad = reg;
	}
	return mdiobus_read(pl->phydev->mdio.bus, prtad, devad);
}

static int phylink_phy_write(struct phylink *pl, unsigned int phy_id,
			     unsigned int reg, unsigned int val)
{
	struct phy_device *phydev = pl->phydev;
	int prtad, devad;

	if (mdio_phy_id_is_c45(phy_id)) {
		prtad = mdio_phy_id_prtad(phy_id);
		devad = mdio_phy_id_devad(phy_id);
		devad = mdiobus_c45_addr(devad, reg);
	} else if (phydev->is_c45) {
		switch (reg) {
		case MII_BMCR:
		case MII_BMSR:
		case MII_PHYSID1:
		case MII_PHYSID2:
			devad = __ffs(phydev->c45_ids.mmds_present);
			break;
		case MII_ADVERTISE:
		case MII_LPA:
			if (!(phydev->c45_ids.mmds_present & MDIO_DEVS_AN))
				return -EINVAL;
			devad = MDIO_MMD_AN;
			if (reg == MII_ADVERTISE)
				reg = MDIO_AN_ADVERTISE;
			else
				reg = MDIO_AN_LPA;
			break;
		default:
			return -EINVAL;
		}
		prtad = phy_id;
		devad = mdiobus_c45_addr(devad, reg);
	} else {
		prtad = phy_id;
		devad = reg;
	}

	return mdiobus_write(phydev->mdio.bus, prtad, devad, val);
}

static int phylink_mii_read(struct phylink *pl, unsigned int phy_id,
			    unsigned int reg)
{
	struct phylink_link_state state;
	int val = 0xffff;

	switch (pl->cur_link_an_mode) {
	case MLO_AN_FIXED:
		if (phy_id == 0) {
			phylink_get_fixed_state(pl, &state);
			val = phylink_mii_emul_read(reg, &state);
		}
		break;

	case MLO_AN_PHY:
		return -EOPNOTSUPP;

	case MLO_AN_INBAND:
		if (phy_id == 0) {
			phylink_mac_pcs_get_state(pl, &state);
			val = phylink_mii_emul_read(reg, &state);
		}
		break;
	}

	return val & 0xffff;
}

static int phylink_mii_write(struct phylink *pl, unsigned int phy_id,
			     unsigned int reg, unsigned int val)
{
	switch (pl->cur_link_an_mode) {
	case MLO_AN_FIXED:
		break;

	case MLO_AN_PHY:
		return -EOPNOTSUPP;

	case MLO_AN_INBAND:
		break;
	}

	return 0;
}

/**
 * phylink_mii_ioctl() - generic mii ioctl interface
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @ifr: a pointer to a &struct ifreq for socket ioctls
 * @cmd: ioctl cmd to execute
 *
 * Perform the specified MII ioctl on the PHY attached to the phylink instance
 * specified by @pl. If no PHY is attached, emulate the presence of the PHY.
 *
 * Returns: zero on success or negative error code.
 *
 * %SIOCGMIIPHY:
 *  read register from the current PHY.
 * %SIOCGMIIREG:
 *  read register from the specified PHY.
 * %SIOCSMIIREG:
 *  set a register on the specified PHY.
 */
int phylink_mii_ioctl(struct phylink *pl, struct ifreq *ifr, int cmd)
{
	struct mii_ioctl_data *mii = if_mii(ifr);
	int  ret;

	ASSERT_RTNL();

	if (pl->phydev) {
		/* PHYs only exist for MLO_AN_PHY and SGMII */
		switch (cmd) {
		case SIOCGMIIPHY:
			mii->phy_id = pl->phydev->mdio.addr;
			fallthrough;

		case SIOCGMIIREG:
			ret = phylink_phy_read(pl, mii->phy_id, mii->reg_num);
			if (ret >= 0) {
				mii->val_out = ret;
				ret = 0;
			}
			break;

		case SIOCSMIIREG:
			ret = phylink_phy_write(pl, mii->phy_id, mii->reg_num,
						mii->val_in);
			break;

		default:
			ret = phy_mii_ioctl(pl->phydev, ifr, cmd);
			break;
		}
	} else {
		switch (cmd) {
		case SIOCGMIIPHY:
			mii->phy_id = 0;
			fallthrough;

		case SIOCGMIIREG:
			ret = phylink_mii_read(pl, mii->phy_id, mii->reg_num);
			if (ret >= 0) {
				mii->val_out = ret;
				ret = 0;
			}
			break;

		case SIOCSMIIREG:
			ret = phylink_mii_write(pl, mii->phy_id, mii->reg_num,
						mii->val_in);
			break;

		default:
			ret = -EOPNOTSUPP;
			break;
		}
	}

	return ret;
}
EXPORT_SYMBOL_GPL(phylink_mii_ioctl);

/**
 * phylink_speed_down() - set the non-SFP PHY to lowest speed supported by both
 *   link partners
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 * @sync: perform action synchronously
 *
 * If we have a PHY that is not part of a SFP module, then set the speed
 * as described in the phy_speed_down() function. Please see this function
 * for a description of the @sync parameter.
 *
 * Returns zero if there is no PHY, otherwise as per phy_speed_down().
 */
int phylink_speed_down(struct phylink *pl, bool sync)
{
	int ret = 0;

	ASSERT_RTNL();

	if (!pl->sfp_bus && pl->phydev)
		ret = phy_speed_down(pl->phydev, sync);

	return ret;
}
EXPORT_SYMBOL_GPL(phylink_speed_down);

/**
 * phylink_speed_up() - restore the advertised speeds prior to the call to
 *   phylink_speed_down()
 * @pl: a pointer to a &struct phylink returned from phylink_create()
 *
 * If we have a PHY that is not part of a SFP module, then restore the
 * PHY speeds as per phy_speed_up().
 *
 * Returns zero if there is no PHY, otherwise as per phy_speed_up().
 */
int phylink_speed_up(struct phylink *pl)
{
	int ret = 0;

	ASSERT_RTNL();

	if (!pl->sfp_bus && pl->phydev)
		ret = phy_speed_up(pl->phydev);

	return ret;
}
EXPORT_SYMBOL_GPL(phylink_speed_up);

static void phylink_sfp_attach(void *upstream, struct sfp_bus *bus)
{
	struct phylink *pl = upstream;

	pl->netdev->sfp_bus = bus;
}

static void phylink_sfp_detach(void *upstream, struct sfp_bus *bus)
{
	struct phylink *pl = upstream;

	pl->netdev->sfp_bus = NULL;
}

static int phylink_sfp_config(struct phylink *pl, u8 mode,
			      const unsigned long *supported,
			      const unsigned long *advertising)
{
	__ETHTOOL_DECLARE_LINK_MODE_MASK(support1);
	__ETHTOOL_DECLARE_LINK_MODE_MASK(support);
	struct phylink_link_state config;
	phy_interface_t iface;
	bool changed;
	int ret;

	linkmode_copy(support, supported);

	memset(&config, 0, sizeof(config));
	linkmode_copy(config.advertising, advertising);
	config.interface = PHY_INTERFACE_MODE_NA;
	config.speed = SPEED_UNKNOWN;
	config.duplex = DUPLEX_UNKNOWN;
	config.pause = MLO_PAUSE_AN;
	config.an_enabled = pl->link_config.an_enabled;

	/* Ignore errors if we're expecting a PHY to attach later */
	ret = phylink_validate(pl, support, &config);
	if (ret) {
		phylink_err(pl, "validation with support %*pb failed: %d\n",
			    __ETHTOOL_LINK_MODE_MASK_NBITS, support, ret);
		return ret;
	}

	iface = sfp_select_interface(pl->sfp_bus, config.advertising);
	if (iface == PHY_INTERFACE_MODE_NA) {
		phylink_err(pl,
			    "selection of interface failed, advertisement %*pb\n",
			    __ETHTOOL_LINK_MODE_MASK_NBITS, config.advertising);
		return -EINVAL;
	}

	config.interface = iface;
	linkmode_copy(support1, support);
	ret = phylink_validate(pl, support1, &config);
	if (ret) {
		phylink_err(pl, "validation of %s/%s with support %*pb failed: %d\n",
			    phylink_an_mode_str(mode),
			    phy_modes(config.interface),
			    __ETHTOOL_LINK_MODE_MASK_NBITS, support, ret);
		return ret;
	}

	phylink_dbg(pl, "requesting link mode %s/%s with support %*pb\n",
		    phylink_an_mode_str(mode), phy_modes(config.interface),
		    __ETHTOOL_LINK_MODE_MASK_NBITS, support);

	if (phy_interface_mode_is_8023z(iface) && pl->phydev)
		return -EINVAL;

	changed = !linkmode_equal(pl->supported, support);
	if (changed) {
		linkmode_copy(pl->supported, support);
		linkmode_copy(pl->link_config.advertising, config.advertising);
	}

	if (pl->cur_link_an_mode != mode ||
	    pl->link_config.interface != config.interface) {
		pl->link_config.interface = config.interface;
		pl->cur_link_an_mode = mode;

		changed = true;

		phylink_info(pl, "switched to %s/%s link mode\n",
			     phylink_an_mode_str(mode),
			     phy_modes(config.interface));
	}

	pl->link_port = pl->sfp_port;

	if (changed && !test_bit(PHYLINK_DISABLE_STOPPED,
				 &pl->phylink_disable_state))
		phylink_mac_initial_config(pl, false);

	return ret;
}

static int phylink_sfp_module_insert(void *upstream,
				     const struct sfp_eeprom_id *id)
{
	struct phylink *pl = upstream;
	unsigned long *support = pl->sfp_support;

	ASSERT_RTNL();

	linkmode_zero(support);
	sfp_parse_support(pl->sfp_bus, id, support);
	pl->sfp_port = sfp_parse_port(pl->sfp_bus, id, support);

	/* If this module may have a PHY connecting later, defer until later */
	pl->sfp_may_have_phy = sfp_may_have_phy(pl->sfp_bus, id);
	if (pl->sfp_may_have_phy)
		return 0;

	return phylink_sfp_config(pl, MLO_AN_INBAND, support, support);
}

static int phylink_sfp_module_start(void *upstream)
{
	struct phylink *pl = upstream;

	/* If this SFP module has a PHY, start the PHY now. */
	if (pl->phydev) {
		phy_start(pl->phydev);
		return 0;
	}

	/* If the module may have a PHY but we didn't detect one we
	 * need to configure the MAC here.
	 */
	if (!pl->sfp_may_have_phy)
		return 0;

	return phylink_sfp_config(pl, MLO_AN_INBAND,
				  pl->sfp_support, pl->sfp_support);
}

static void phylink_sfp_module_stop(void *upstream)
{
	struct phylink *pl = upstream;

	/* If this SFP module has a PHY, stop it. */
	if (pl->phydev)
		phy_stop(pl->phydev);
}

static void phylink_sfp_link_down(void *upstream)
{
	struct phylink *pl = upstream;

	ASSERT_RTNL();

	phylink_run_resolve_and_disable(pl, PHYLINK_DISABLE_LINK);
}

static void phylink_sfp_link_up(void *upstream)
{
	struct phylink *pl = upstream;

	ASSERT_RTNL();

	clear_bit(PHYLINK_DISABLE_LINK, &pl->phylink_disable_state);
	phylink_run_resolve(pl);
}

/* The Broadcom BCM84881 in the Methode DM7052 is unable to provide a SGMII
 * or 802.3z control word, so inband will not work.
 */
static bool phylink_phy_no_inband(struct phy_device *phy)
{
	return phy->is_c45 &&
		(phy->c45_ids.device_ids[1] & 0xfffffff0) == 0xae025150;
}

static int phylink_sfp_connect_phy(void *upstream, struct phy_device *phy)
{
	struct phylink *pl = upstream;
	phy_interface_t interface;
	u8 mode;
	int ret;

	/*
	 * This is the new way of dealing with flow control for PHYs,
	 * as described by Timur Tabi in commit 529ed1275263 ("net: phy:
	 * phy drivers should not set SUPPORTED_[Asym_]Pause") except
	 * using our validate call to the MAC, we rely upon the MAC
	 * clearing the bits from both supported and advertising fields.
	 */
	phy_support_asym_pause(phy);

	if (phylink_phy_no_inband(phy))
		mode = MLO_AN_PHY;
	else
		mode = MLO_AN_INBAND;

	/* Do the initial configuration */
	ret = phylink_sfp_config(pl, mode, phy->supported, phy->advertising);
	if (ret < 0)
		return ret;

	interface = pl->link_config.interface;
	ret = phylink_attach_phy(pl, phy, interface);
	if (ret < 0)
		return ret;

	ret = phylink_bringup_phy(pl, phy, interface);
	if (ret)
		phy_detach(phy);

	return ret;
}

static void phylink_sfp_disconnect_phy(void *upstream)
{
	phylink_disconnect_phy(upstream);
}

static const struct sfp_upstream_ops sfp_phylink_ops = {
	.attach = phylink_sfp_attach,
	.detach = phylink_sfp_detach,
	.module_insert = phylink_sfp_module_insert,
	.module_start = phylink_sfp_module_start,
	.module_stop = phylink_sfp_module_stop,
	.link_up = phylink_sfp_link_up,
	.link_down = phylink_sfp_link_down,
	.connect_phy = phylink_sfp_connect_phy,
	.disconnect_phy = phylink_sfp_disconnect_phy,
};

/* Helpers for MAC drivers */

/**
 * phylink_helper_basex_speed() - 1000BaseX/2500BaseX helper
 * @state: a pointer to a &struct phylink_link_state
 *
 * Inspect the interface mode, advertising mask or forced speed and
 * decide whether to run at 2.5Gbit or 1Gbit appropriately, switching
 * the interface mode to suit.  @state->interface is appropriately
 * updated, and the advertising mask has the "other" baseX_Full flag
 * cleared.
 */
void phylink_helper_basex_speed(struct phylink_link_state *state)
{
	if (phy_interface_mode_is_8023z(state->interface)) {
		bool want_2500 = state->an_enabled ?
			phylink_test(state->advertising, 2500baseX_Full) :
			state->speed == SPEED_2500;

		if (want_2500) {
			phylink_clear(state->advertising, 1000baseX_Full);
			state->interface = PHY_INTERFACE_MODE_2500BASEX;
		} else {
			phylink_clear(state->advertising, 2500baseX_Full);
			state->interface = PHY_INTERFACE_MODE_1000BASEX;
		}
	}
}
EXPORT_SYMBOL_GPL(phylink_helper_basex_speed);

static void phylink_decode_c37_word(struct phylink_link_state *state,
				    uint16_t config_reg, int speed)
{
	bool tx_pause, rx_pause;
	int fd_bit;

	if (speed == SPEED_2500)
		fd_bit = ETHTOOL_LINK_MODE_2500baseX_Full_BIT;
	else
		fd_bit = ETHTOOL_LINK_MODE_1000baseX_Full_BIT;

	mii_lpa_mod_linkmode_x(state->lp_advertising, config_reg, fd_bit);

	if (linkmode_test_bit(fd_bit, state->advertising) &&
	    linkmode_test_bit(fd_bit, state->lp_advertising)) {
		state->speed = speed;
		state->duplex = DUPLEX_FULL;
	} else {
		/* negotiation failure */
		state->link = false;
	}

	linkmode_resolve_pause(state->advertising, state->lp_advertising,
			       &tx_pause, &rx_pause);

	if (tx_pause)
		state->pause |= MLO_PAUSE_TX;
	if (rx_pause)
		state->pause |= MLO_PAUSE_RX;
}

static void phylink_decode_sgmii_word(struct phylink_link_state *state,
				      uint16_t config_reg)
{
	if (!(config_reg & LPA_SGMII_LINK)) {
		state->link = false;
		return;
	}

	switch (config_reg & LPA_SGMII_SPD_MASK) {
	case LPA_SGMII_10:
		state->speed = SPEED_10;
		break;
	case LPA_SGMII_100:
		state->speed = SPEED_100;
		break;
	case LPA_SGMII_1000:
		state->speed = SPEED_1000;
		break;
	default:
		state->link = false;
		return;
	}
	if (config_reg & LPA_SGMII_FULL_DUPLEX)
		state->duplex = DUPLEX_FULL;
	else
		state->duplex = DUPLEX_HALF;
}

/**
 * phylink_decode_usxgmii_word() - decode the USXGMII word from a MAC PCS
 * @state: a pointer to a struct phylink_link_state.
 * @lpa: a 16 bit value which stores the USXGMII auto-negotiation word
 *
 * Helper for MAC PCS supporting the USXGMII protocol and the auto-negotiation
 * code word.  Decode the USXGMII code word and populate the corresponding fields
 * (speed, duplex) into the phylink_link_state structure.
 */
void phylink_decode_usxgmii_word(struct phylink_link_state *state,
				 uint16_t lpa)
{
	switch (lpa & MDIO_USXGMII_SPD_MASK) {
	case MDIO_USXGMII_10:
		state->speed = SPEED_10;
		break;
	case MDIO_USXGMII_100:
		state->speed = SPEED_100;
		break;
	case MDIO_USXGMII_1000:
		state->speed = SPEED_1000;
		break;
	case MDIO_USXGMII_2500:
		state->speed = SPEED_2500;
		break;
	case MDIO_USXGMII_5000:
		state->speed = SPEED_5000;
		break;
	case MDIO_USXGMII_10G:
		state->speed = SPEED_10000;
		break;
	default:
		state->link = false;
		return;
	}

	if (lpa & MDIO_USXGMII_FULL_DUPLEX)
		state->duplex = DUPLEX_FULL;
	else
		state->duplex = DUPLEX_HALF;
}
EXPORT_SYMBOL_GPL(phylink_decode_usxgmii_word);

/**
 * phylink_mii_c22_pcs_get_state() - read the MAC PCS state
 * @pcs: a pointer to a &struct mdio_device.
 * @state: a pointer to a &struct phylink_link_state.
 *
 * Helper for MAC PCS supporting the 802.3 clause 22 register set for
 * clause 37 negotiation and/or SGMII control.
 *
 * Read the MAC PCS state from the MII device configured in @config and
 * parse the Clause 37 or Cisco SGMII link partner negotiation word into
 * the phylink @state structure. This is suitable to be directly plugged
 * into the mac_pcs_get_state() member of the struct phylink_mac_ops
 * structure.
 */
void phylink_mii_c22_pcs_get_state(struct mdio_device *pcs,
				   struct phylink_link_state *state)
{
	struct mii_bus *bus = pcs->bus;
	int addr = pcs->addr;
	int bmsr, lpa;

	bmsr = mdiobus_read(bus, addr, MII_BMSR);
	lpa = mdiobus_read(bus, addr, MII_LPA);
	if (bmsr < 0 || lpa < 0) {
		state->link = false;
		return;
	}

	state->link = !!(bmsr & BMSR_LSTATUS);
	state->an_complete = !!(bmsr & BMSR_ANEGCOMPLETE);
	if (!state->link)
		return;

	switch (state->interface) {
	case PHY_INTERFACE_MODE_1000BASEX:
		phylink_decode_c37_word(state, lpa, SPEED_1000);
		break;

	case PHY_INTERFACE_MODE_2500BASEX:
		phylink_decode_c37_word(state, lpa, SPEED_2500);
		break;

	case PHY_INTERFACE_MODE_SGMII:
	case PHY_INTERFACE_MODE_QSGMII:
		phylink_decode_sgmii_word(state, lpa);
		break;

	default:
		state->link = false;
		break;
	}
}
EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_get_state);

/**
 * phylink_mii_c22_pcs_set_advertisement() - configure the clause 37 PCS
 *	advertisement
 * @pcs: a pointer to a &struct mdio_device.
 * @interface: the PHY interface mode being configured
 * @advertising: the ethtool advertisement mask
 *
 * Helper for MAC PCS supporting the 802.3 clause 22 register set for
 * clause 37 negotiation and/or SGMII control.
 *
 * Configure the clause 37 PCS advertisement as specified by @state. This
 * does not trigger a renegotiation; phylink will do that via the
 * mac_an_restart() method of the struct phylink_mac_ops structure.
 *
 * Returns negative error code on failure to configure the advertisement,
 * zero if no change has been made, or one if the advertisement has changed.
 */
int phylink_mii_c22_pcs_set_advertisement(struct mdio_device *pcs,
					  phy_interface_t interface,
					  const unsigned long *advertising)
{
	struct mii_bus *bus = pcs->bus;
	int addr = pcs->addr;
	int val, ret;
	u16 adv;

	switch (interface) {
	case PHY_INTERFACE_MODE_1000BASEX:
	case PHY_INTERFACE_MODE_2500BASEX:
		adv = ADVERTISE_1000XFULL;
		if (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
				      advertising))
			adv |= ADVERTISE_1000XPAUSE;
		if (linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
				      advertising))
			adv |= ADVERTISE_1000XPSE_ASYM;

		val = mdiobus_read(bus, addr, MII_ADVERTISE);
		if (val < 0)
			return val;

		if (val == adv)
			return 0;

		ret = mdiobus_write(bus, addr, MII_ADVERTISE, adv);
		if (ret < 0)
			return ret;

		return 1;

	case PHY_INTERFACE_MODE_SGMII:
		val = mdiobus_read(bus, addr, MII_ADVERTISE);
		if (val < 0)
			return val;

		if (val == 0x0001)
			return 0;

		ret = mdiobus_write(bus, addr, MII_ADVERTISE, 0x0001);
		if (ret < 0)
			return ret;

		return 1;

	default:
		/* Nothing to do for other modes */
		return 0;
	}
}
EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_set_advertisement);

/**
 * phylink_mii_c22_pcs_config() - configure clause 22 PCS
 * @pcs: a pointer to a &struct mdio_device.
 * @mode: link autonegotiation mode
 * @interface: the PHY interface mode being configured
 * @advertising: the ethtool advertisement mask
 *
 * Configure a Clause 22 PCS PHY with the appropriate negotiation
 * parameters for the @mode, @interface and @advertising parameters.
 * Returns negative error number on failure, zero if the advertisement
 * has not changed, or positive if there is a change.
 */
int phylink_mii_c22_pcs_config(struct mdio_device *pcs, unsigned int mode,
			       phy_interface_t interface,
			       const unsigned long *advertising)
{
	bool changed;
	u16 bmcr;
	int ret;

	ret = phylink_mii_c22_pcs_set_advertisement(pcs, interface,
						    advertising);
	if (ret < 0)
		return ret;

	changed = ret > 0;

	/* Ensure ISOLATE bit is disabled */
	bmcr = mode == MLO_AN_INBAND ? BMCR_ANENABLE : 0;
	ret = mdiobus_modify(pcs->bus, pcs->addr, MII_BMCR,
			     BMCR_ANENABLE | BMCR_ISOLATE, bmcr);
	if (ret < 0)
		return ret;

	return changed ? 1 : 0;
}
EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_config);

/**
 * phylink_mii_c22_pcs_an_restart() - restart 802.3z autonegotiation
 * @pcs: a pointer to a &struct mdio_device.
 *
 * Helper for MAC PCS supporting the 802.3 clause 22 register set for
 * clause 37 negotiation.
 *
 * Restart the clause 37 negotiation with the link partner. This is
 * suitable to be directly plugged into the mac_pcs_get_state() member
 * of the struct phylink_mac_ops structure.
 */
void phylink_mii_c22_pcs_an_restart(struct mdio_device *pcs)
{
	struct mii_bus *bus = pcs->bus;
	int val, addr = pcs->addr;

	val = mdiobus_read(bus, addr, MII_BMCR);
	if (val >= 0) {
		val |= BMCR_ANRESTART;

		mdiobus_write(bus, addr, MII_BMCR, val);
	}
}
EXPORT_SYMBOL_GPL(phylink_mii_c22_pcs_an_restart);

void phylink_mii_c45_pcs_get_state(struct mdio_device *pcs,
				   struct phylink_link_state *state)
{
	struct mii_bus *bus = pcs->bus;
	int addr = pcs->addr;
	int stat;

	stat = mdiobus_c45_read(bus, addr, MDIO_MMD_PCS, MDIO_STAT1);
	if (stat < 0) {
		state->link = false;
		return;
	}

	state->link = !!(stat & MDIO_STAT1_LSTATUS);
	if (!state->link)
		return;

	switch (state->interface) {
	case PHY_INTERFACE_MODE_10GBASER:
		state->speed = SPEED_10000;
		state->duplex = DUPLEX_FULL;
		break;

	default:
		break;
	}
}
EXPORT_SYMBOL_GPL(phylink_mii_c45_pcs_get_state);

MODULE_LICENSE("GPL v2");