summaryrefslogtreecommitdiff
path: root/drivers/net/r8169.c
blob: 07e2df09491f207d5b27da4895668b68dca3bd43 (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
/*
=========================================================================
 r8169.c: A RealTek RTL-8169 Gigabit Ethernet driver for Linux kernel 2.4.x.
 --------------------------------------------------------------------

 History:
 Feb  4 2002	- created initially by ShuChen <shuchen@realtek.com.tw>.
 May 20 2002	- Add link status force-mode and TBI mode support.
        2004	- Massive updates. See kernel SCM system for details.
=========================================================================
  1. [DEPRECATED: use ethtool instead] The media can be forced in 5 modes.
	 Command: 'insmod r8169 media = SET_MEDIA'
	 Ex:	  'insmod r8169 media = 0x04' will force PHY to operate in 100Mpbs Half-duplex.
	
	 SET_MEDIA can be:
 		_10_Half	= 0x01
 		_10_Full	= 0x02
 		_100_Half	= 0x04
 		_100_Full	= 0x08
 		_1000_Full	= 0x10
  
  2. Support TBI mode.
=========================================================================
VERSION 1.1	<2002/10/4>

	The bit4:0 of MII register 4 is called "selector field", and have to be
	00001b to indicate support of IEEE std 802.3 during NWay process of
	exchanging Link Code Word (FLP). 

VERSION 1.2	<2002/11/30>

	- Large style cleanup
	- Use ether_crc in stock kernel (linux/crc32.h)
	- Copy mc_filter setup code from 8139cp
	  (includes an optimization, and avoids set_bit use)

VERSION 1.6LK	<2004/04/14>

	- Merge of Realtek's version 1.6
	- Conversion to DMA API
	- Suspend/resume
	- Endianness
	- Misc Rx/Tx bugs

VERSION 2.2LK	<2005/01/25>

	- RX csum, TX csum/SG, TSO
	- VLAN
	- baby (< 7200) Jumbo frames support
	- Merge of Realtek's version 2.2 (new phy)
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/pci.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/delay.h>
#include <linux/ethtool.h>
#include <linux/mii.h>
#include <linux/if_vlan.h>
#include <linux/crc32.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>

#include <asm/io.h>
#include <asm/irq.h>

#define RTL8169_VERSION "2.2LK"
#define MODULENAME "r8169"
#define PFX MODULENAME ": "

#ifdef RTL8169_DEBUG
#define assert(expr) \
        if(!(expr)) {					\
	        printk( "Assertion failed! %s,%s,%s,line=%d\n",	\
        	#expr,__FILE__,__FUNCTION__,__LINE__);		\
        }
#define dprintk(fmt, args...)	do { printk(PFX fmt, ## args); } while (0)
#else
#define assert(expr) do {} while (0)
#define dprintk(fmt, args...)	do {} while (0)
#endif /* RTL8169_DEBUG */

#define TX_BUFFS_AVAIL(tp) \
	(tp->dirty_tx + NUM_TX_DESC - tp->cur_tx - 1)

#ifdef CONFIG_R8169_NAPI
#define rtl8169_rx_skb			netif_receive_skb
#define rtl8169_rx_hwaccel_skb		vlan_hwaccel_rx
#define rtl8169_rx_quota(count, quota)	min(count, quota)
#else
#define rtl8169_rx_skb			netif_rx
#define rtl8169_rx_hwaccel_skb		vlan_hwaccel_receive_skb
#define rtl8169_rx_quota(count, quota)	count
#endif

/* media options */
#define MAX_UNITS 8
static int media[MAX_UNITS] = { -1, -1, -1, -1, -1, -1, -1, -1 };
static int num_media = 0;

/* Maximum events (Rx packets, etc.) to handle at each interrupt. */
static int max_interrupt_work = 20;

/* Maximum number of multicast addresses to filter (vs. Rx-all-multicast).
   The RTL chips use a 64 element hash table based on the Ethernet CRC. */
static int multicast_filter_limit = 32;

/* MAC address length */
#define MAC_ADDR_LEN	6

#define RX_FIFO_THRESH	7	/* 7 means NO threshold, Rx buffer level before first PCI xfer. */
#define RX_DMA_BURST	6	/* Maximum PCI burst, '6' is 1024 */
#define TX_DMA_BURST	6	/* Maximum PCI burst, '6' is 1024 */
#define EarlyTxThld 	0x3F	/* 0x3F means NO early transmit */
#define RxPacketMaxSize	0x3FE8	/* 16K - 1 - ETH_HLEN - VLAN - CRC... */
#define SafeMtu		0x1c20	/* ... actually life sucks beyond ~7k */
#define InterFrameGap	0x03	/* 3 means InterFrameGap = the shortest one */

#define R8169_REGS_SIZE		256
#define R8169_NAPI_WEIGHT	64
#define NUM_TX_DESC	64	/* Number of Tx descriptor registers */
#define NUM_RX_DESC	256	/* Number of Rx descriptor registers */
#define RX_BUF_SIZE	1536	/* Rx Buffer size */
#define R8169_TX_RING_BYTES	(NUM_TX_DESC * sizeof(struct TxDesc))
#define R8169_RX_RING_BYTES	(NUM_RX_DESC * sizeof(struct RxDesc))

#define RTL8169_TX_TIMEOUT	(6*HZ)
#define RTL8169_PHY_TIMEOUT	(10*HZ)

/* write/read MMIO register */
#define RTL_W8(reg, val8)	writeb ((val8), ioaddr + (reg))
#define RTL_W16(reg, val16)	writew ((val16), ioaddr + (reg))
#define RTL_W32(reg, val32)	writel ((val32), ioaddr + (reg))
#define RTL_R8(reg)		readb (ioaddr + (reg))
#define RTL_R16(reg)		readw (ioaddr + (reg))
#define RTL_R32(reg)		((unsigned long) readl (ioaddr + (reg)))

enum mac_version {
	RTL_GIGA_MAC_VER_B = 0x00,
	/* RTL_GIGA_MAC_VER_C = 0x03, */
	RTL_GIGA_MAC_VER_D = 0x01,
	RTL_GIGA_MAC_VER_E = 0x02,
	RTL_GIGA_MAC_VER_X = 0x04	/* Greater than RTL_GIGA_MAC_VER_E */
};

enum phy_version {
	RTL_GIGA_PHY_VER_C = 0x03, /* PHY Reg 0x03 bit0-3 == 0x0000 */
	RTL_GIGA_PHY_VER_D = 0x04, /* PHY Reg 0x03 bit0-3 == 0x0000 */
	RTL_GIGA_PHY_VER_E = 0x05, /* PHY Reg 0x03 bit0-3 == 0x0000 */
	RTL_GIGA_PHY_VER_F = 0x06, /* PHY Reg 0x03 bit0-3 == 0x0001 */
	RTL_GIGA_PHY_VER_G = 0x07, /* PHY Reg 0x03 bit0-3 == 0x0002 */
	RTL_GIGA_PHY_VER_H = 0x08, /* PHY Reg 0x03 bit0-3 == 0x0003 */
};


#define _R(NAME,MAC,MASK) \
	{ .name = NAME, .mac_version = MAC, .RxConfigMask = MASK }

const static struct {
	const char *name;
	u8 mac_version;
	u32 RxConfigMask;	/* Clears the bits supported by this chip */
} rtl_chip_info[] = {
	_R("RTL8169",		RTL_GIGA_MAC_VER_B, 0xff7e1880),
	_R("RTL8169s/8110s",	RTL_GIGA_MAC_VER_D, 0xff7e1880),
	_R("RTL8169s/8110s",	RTL_GIGA_MAC_VER_E, 0xff7e1880),
	_R("RTL8169s/8110s",	RTL_GIGA_MAC_VER_X, 0xff7e1880),
};
#undef _R

static struct pci_device_id rtl8169_pci_tbl[] = {
	{0x10ec, 0x8169, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
	{0x1186, 0x4300, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
	{0,},
};

MODULE_DEVICE_TABLE(pci, rtl8169_pci_tbl);

static int rx_copybreak = 200;
static int use_dac;

enum RTL8169_registers {
	MAC0 = 0,		/* Ethernet hardware address. */
	MAR0 = 8,		/* Multicast filter. */
	TxDescStartAddrLow = 0x20,
	TxDescStartAddrHigh = 0x24,
	TxHDescStartAddrLow = 0x28,
	TxHDescStartAddrHigh = 0x2c,
	FLASH = 0x30,
	ERSR = 0x36,
	ChipCmd = 0x37,
	TxPoll = 0x38,
	IntrMask = 0x3C,
	IntrStatus = 0x3E,
	TxConfig = 0x40,
	RxConfig = 0x44,
	RxMissed = 0x4C,
	Cfg9346 = 0x50,
	Config0 = 0x51,
	Config1 = 0x52,
	Config2 = 0x53,
	Config3 = 0x54,
	Config4 = 0x55,
	Config5 = 0x56,
	MultiIntr = 0x5C,
	PHYAR = 0x60,
	TBICSR = 0x64,
	TBI_ANAR = 0x68,
	TBI_LPAR = 0x6A,
	PHYstatus = 0x6C,
	RxMaxSize = 0xDA,
	CPlusCmd = 0xE0,
	IntrMitigate = 0xE2,
	RxDescAddrLow = 0xE4,
	RxDescAddrHigh = 0xE8,
	EarlyTxThres = 0xEC,
	FuncEvent = 0xF0,
	FuncEventMask = 0xF4,
	FuncPresetState = 0xF8,
	FuncForceEvent = 0xFC,
};

enum RTL8169_register_content {
	/* InterruptStatusBits */
	SYSErr = 0x8000,
	PCSTimeout = 0x4000,
	SWInt = 0x0100,
	TxDescUnavail = 0x80,
	RxFIFOOver = 0x40,
	LinkChg = 0x20,
	RxOverflow = 0x10,
	TxErr = 0x08,
	TxOK = 0x04,
	RxErr = 0x02,
	RxOK = 0x01,

	/* RxStatusDesc */
	RxRES = 0x00200000,
	RxCRC = 0x00080000,
	RxRUNT = 0x00100000,
	RxRWT = 0x00400000,

	/* ChipCmdBits */
	CmdReset = 0x10,
	CmdRxEnb = 0x08,
	CmdTxEnb = 0x04,
	RxBufEmpty = 0x01,

	/* Cfg9346Bits */
	Cfg9346_Lock = 0x00,
	Cfg9346_Unlock = 0xC0,

	/* rx_mode_bits */
	AcceptErr = 0x20,
	AcceptRunt = 0x10,
	AcceptBroadcast = 0x08,
	AcceptMulticast = 0x04,
	AcceptMyPhys = 0x02,
	AcceptAllPhys = 0x01,

	/* RxConfigBits */
	RxCfgFIFOShift = 13,
	RxCfgDMAShift = 8,

	/* TxConfigBits */
	TxInterFrameGapShift = 24,
	TxDMAShift = 8,	/* DMA burst value (0-7) is shift this many bits */

	/* TBICSR p.28 */
	TBIReset	= 0x80000000,
	TBILoopback	= 0x40000000,
	TBINwEnable	= 0x20000000,
	TBINwRestart	= 0x10000000,
	TBILinkOk	= 0x02000000,
	TBINwComplete	= 0x01000000,

	/* CPlusCmd p.31 */
	RxVlan		= (1 << 6),
	RxChkSum	= (1 << 5),
	PCIDAC		= (1 << 4),
	PCIMulRW	= (1 << 3),

	/* rtl8169_PHYstatus */
	TBI_Enable = 0x80,
	TxFlowCtrl = 0x40,
	RxFlowCtrl = 0x20,
	_1000bpsF = 0x10,
	_100bps = 0x08,
	_10bps = 0x04,
	LinkStatus = 0x02,
	FullDup = 0x01,

	/* GIGABIT_PHY_registers */
	PHY_CTRL_REG = 0,
	PHY_STAT_REG = 1,
	PHY_AUTO_NEGO_REG = 4,
	PHY_1000_CTRL_REG = 9,

	/* GIGABIT_PHY_REG_BIT */
	PHY_Restart_Auto_Nego = 0x0200,
	PHY_Enable_Auto_Nego = 0x1000,

	/* PHY_STAT_REG = 1 */
	PHY_Auto_Neco_Comp = 0x0020,

	/* PHY_AUTO_NEGO_REG = 4 */
	PHY_Cap_10_Half = 0x0020,
	PHY_Cap_10_Full = 0x0040,
	PHY_Cap_100_Half = 0x0080,
	PHY_Cap_100_Full = 0x0100,

	/* PHY_1000_CTRL_REG = 9 */
	PHY_Cap_1000_Full = 0x0200,

	PHY_Cap_Null = 0x0,

	/* _MediaType */
	_10_Half = 0x01,
	_10_Full = 0x02,
	_100_Half = 0x04,
	_100_Full = 0x08,
	_1000_Full = 0x10,

	/* _TBICSRBit */
	TBILinkOK = 0x02000000,
};

enum _DescStatusBit {
	DescOwn		= (1 << 31), /* Descriptor is owned by NIC */
	RingEnd		= (1 << 30), /* End of descriptor ring */
	FirstFrag	= (1 << 29), /* First segment of a packet */
	LastFrag	= (1 << 28), /* Final segment of a packet */

	/* Tx private */
	LargeSend	= (1 << 27), /* TCP Large Send Offload (TSO) */
	MSSShift	= 16,        /* MSS value position */
	MSSMask		= 0xfff,     /* MSS value + LargeSend bit: 12 bits */
	IPCS		= (1 << 18), /* Calculate IP checksum */
	UDPCS		= (1 << 17), /* Calculate UDP/IP checksum */
	TCPCS		= (1 << 16), /* Calculate TCP/IP checksum */
	TxVlanTag	= (1 << 17), /* Add VLAN tag */

	/* Rx private */
	PID1		= (1 << 18), /* Protocol ID bit 1/2 */
	PID0		= (1 << 17), /* Protocol ID bit 2/2 */

#define RxProtoUDP	(PID1)
#define RxProtoTCP	(PID0)
#define RxProtoIP	(PID1 | PID0)
#define RxProtoMask	RxProtoIP

	IPFail		= (1 << 16), /* IP checksum failed */
	UDPFail		= (1 << 15), /* UDP/IP checksum failed */
	TCPFail		= (1 << 14), /* TCP/IP checksum failed */
	RxVlanTag	= (1 << 16), /* VLAN tag available */
};

#define RsvdMask	0x3fffc000

struct TxDesc {
	u32 opts1;
	u32 opts2;
	u64 addr;
};

struct RxDesc {
	u32 opts1;
	u32 opts2;
	u64 addr;
};

struct ring_info {
	struct sk_buff	*skb;
	u32		len;
	u8		__pad[sizeof(void *) - sizeof(u32)];
};

struct rtl8169_private {
	void __iomem *mmio_addr;	/* memory map physical address */
	struct pci_dev *pci_dev;	/* Index of PCI device */
	struct net_device_stats stats;	/* statistics of net device */
	spinlock_t lock;		/* spin lock flag */
	int chipset;
	int mac_version;
	int phy_version;
	u32 cur_rx; /* Index into the Rx descriptor buffer of next Rx pkt. */
	u32 cur_tx; /* Index into the Tx descriptor buffer of next Rx pkt. */
	u32 dirty_rx;
	u32 dirty_tx;
	struct TxDesc *TxDescArray;	/* 256-aligned Tx descriptor ring */
	struct RxDesc *RxDescArray;	/* 256-aligned Rx descriptor ring */
	dma_addr_t TxPhyAddr;
	dma_addr_t RxPhyAddr;
	struct sk_buff *Rx_skbuff[NUM_RX_DESC];	/* Rx data buffers */
	struct ring_info tx_skb[NUM_TX_DESC];	/* Tx data buffers */
	unsigned rx_buf_sz;
	struct timer_list timer;
	u16 cp_cmd;
	u16 intr_mask;
	int phy_auto_nego_reg;
	int phy_1000_ctrl_reg;
#ifdef CONFIG_R8169_VLAN
	struct vlan_group *vlgrp;
#endif
	int (*set_speed)(struct net_device *, u8 autoneg, u16 speed, u8 duplex);
	void (*get_settings)(struct net_device *, struct ethtool_cmd *);
	void (*phy_reset_enable)(void __iomem *);
	unsigned int (*phy_reset_pending)(void __iomem *);
	unsigned int (*link_ok)(void __iomem *);
	struct work_struct task;
};

MODULE_AUTHOR("Realtek and the Linux r8169 crew <netdev@oss.sgi.com>");
MODULE_DESCRIPTION("RealTek RTL-8169 Gigabit Ethernet driver");
module_param_array(media, int, &num_media, 0);
module_param(rx_copybreak, int, 0);
module_param(use_dac, int, 0);
MODULE_PARM_DESC(use_dac, "Enable PCI DAC. Unsafe on 32 bit PCI slot.");
MODULE_LICENSE("GPL");
MODULE_VERSION(RTL8169_VERSION);

static int rtl8169_open(struct net_device *dev);
static int rtl8169_start_xmit(struct sk_buff *skb, struct net_device *dev);
static irqreturn_t rtl8169_interrupt(int irq, void *dev_instance,
			      struct pt_regs *regs);
static int rtl8169_init_ring(struct net_device *dev);
static void rtl8169_hw_start(struct net_device *dev);
static int rtl8169_close(struct net_device *dev);
static void rtl8169_set_rx_mode(struct net_device *dev);
static void rtl8169_tx_timeout(struct net_device *dev);
static struct net_device_stats *rtl8169_get_stats(struct net_device *netdev);
static int rtl8169_rx_interrupt(struct net_device *, struct rtl8169_private *,
				void __iomem *);
static int rtl8169_change_mtu(struct net_device *netdev, int new_mtu);
static void rtl8169_down(struct net_device *dev);

#ifdef CONFIG_R8169_NAPI
static int rtl8169_poll(struct net_device *dev, int *budget);
#endif

static const u16 rtl8169_intr_mask =
	SYSErr | LinkChg | RxOverflow | RxFIFOOver | TxErr | TxOK | RxErr | RxOK;
static const u16 rtl8169_napi_event =
	RxOK | RxOverflow | RxFIFOOver | TxOK | TxErr;
static const unsigned int rtl8169_rx_config =
    (RX_FIFO_THRESH << RxCfgFIFOShift) | (RX_DMA_BURST << RxCfgDMAShift);

#define PHY_Cap_10_Half_Or_Less PHY_Cap_10_Half
#define PHY_Cap_10_Full_Or_Less PHY_Cap_10_Full | PHY_Cap_10_Half_Or_Less
#define PHY_Cap_100_Half_Or_Less PHY_Cap_100_Half | PHY_Cap_10_Full_Or_Less
#define PHY_Cap_100_Full_Or_Less PHY_Cap_100_Full | PHY_Cap_100_Half_Or_Less

static void mdio_write(void __iomem *ioaddr, int RegAddr, int value)
{
	int i;

	RTL_W32(PHYAR, 0x80000000 | (RegAddr & 0xFF) << 16 | value);
	udelay(1000);

	for (i = 2000; i > 0; i--) {
		/* Check if the RTL8169 has completed writing to the specified MII register */
		if (!(RTL_R32(PHYAR) & 0x80000000)) 
			break;
		udelay(100);
	}
}

static int mdio_read(void __iomem *ioaddr, int RegAddr)
{
	int i, value = -1;

	RTL_W32(PHYAR, 0x0 | (RegAddr & 0xFF) << 16);
	udelay(1000);

	for (i = 2000; i > 0; i--) {
		/* Check if the RTL8169 has completed retrieving data from the specified MII register */
		if (RTL_R32(PHYAR) & 0x80000000) {
			value = (int) (RTL_R32(PHYAR) & 0xFFFF);
			break;
		}
		udelay(100);
	}
	return value;
}

static void rtl8169_irq_mask_and_ack(void __iomem *ioaddr)
{
	RTL_W16(IntrMask, 0x0000);

	RTL_W16(IntrStatus, 0xffff);
}

static void rtl8169_asic_down(void __iomem *ioaddr)
{
	RTL_W8(ChipCmd, 0x00);
	rtl8169_irq_mask_and_ack(ioaddr);
	RTL_R16(CPlusCmd);
}

static unsigned int rtl8169_tbi_reset_pending(void __iomem *ioaddr)
{
	return RTL_R32(TBICSR) & TBIReset;
}

static unsigned int rtl8169_xmii_reset_pending(void __iomem *ioaddr)
{
	return mdio_read(ioaddr, 0) & 0x8000;
}

static unsigned int rtl8169_tbi_link_ok(void __iomem *ioaddr)
{
	return RTL_R32(TBICSR) & TBILinkOk;
}

static unsigned int rtl8169_xmii_link_ok(void __iomem *ioaddr)
{
	return RTL_R8(PHYstatus) & LinkStatus;
}

static void rtl8169_tbi_reset_enable(void __iomem *ioaddr)
{
	RTL_W32(TBICSR, RTL_R32(TBICSR) | TBIReset);
}

static void rtl8169_xmii_reset_enable(void __iomem *ioaddr)
{
	unsigned int val;

	val = (mdio_read(ioaddr, PHY_CTRL_REG) | 0x8000) & 0xffff;
	mdio_write(ioaddr, PHY_CTRL_REG, val);
}

static void rtl8169_check_link_status(struct net_device *dev,
				      struct rtl8169_private *tp, void __iomem *ioaddr)
{
	unsigned long flags;

	spin_lock_irqsave(&tp->lock, flags);
	if (tp->link_ok(ioaddr)) {
		netif_carrier_on(dev);
		printk(KERN_INFO PFX "%s: link up\n", dev->name);
	} else
		netif_carrier_off(dev);
	spin_unlock_irqrestore(&tp->lock, flags);
}

static void rtl8169_link_option(int idx, u8 *autoneg, u16 *speed, u8 *duplex)
{
	struct {
		u16 speed;
		u8 duplex;
		u8 autoneg;
		u8 media;
	} link_settings[] = {
		{ SPEED_10,	DUPLEX_HALF, AUTONEG_DISABLE,	_10_Half },
		{ SPEED_10,	DUPLEX_FULL, AUTONEG_DISABLE,	_10_Full },
		{ SPEED_100,	DUPLEX_HALF, AUTONEG_DISABLE,	_100_Half },
		{ SPEED_100,	DUPLEX_FULL, AUTONEG_DISABLE,	_100_Full },
		{ SPEED_1000,	DUPLEX_FULL, AUTONEG_DISABLE,	_1000_Full },
		/* Make TBI happy */
		{ SPEED_1000,	DUPLEX_FULL, AUTONEG_ENABLE,	0xff }
	}, *p;
	unsigned char option;
	
	option = ((idx < MAX_UNITS) && (idx >= 0)) ? media[idx] : 0xff;

	if ((option != 0xff) && !idx)
		printk(KERN_WARNING PFX "media option is deprecated.\n");

	for (p = link_settings; p->media != 0xff; p++) {
		if (p->media == option)
			break;
	}
	*autoneg = p->autoneg;
	*speed = p->speed;
	*duplex = p->duplex;
}

static void rtl8169_get_drvinfo(struct net_device *dev,
				struct ethtool_drvinfo *info)
{
	struct rtl8169_private *tp = netdev_priv(dev);

	strcpy(info->driver, MODULENAME);
	strcpy(info->version, RTL8169_VERSION);
	strcpy(info->bus_info, pci_name(tp->pci_dev));
}

static int rtl8169_get_regs_len(struct net_device *dev)
{
	return R8169_REGS_SIZE;
}

static int rtl8169_set_speed_tbi(struct net_device *dev,
				 u8 autoneg, u16 speed, u8 duplex)
{
	struct rtl8169_private *tp = netdev_priv(dev);
	void __iomem *ioaddr = tp->mmio_addr;
	int ret = 0;
	u32 reg;

	reg = RTL_R32(TBICSR);
	if ((autoneg == AUTONEG_DISABLE) && (speed == SPEED_1000) &&
	    (duplex == DUPLEX_FULL)) {
		RTL_W32(TBICSR, reg & ~(TBINwEnable | TBINwRestart));
	} else if (autoneg == AUTONEG_ENABLE)
		RTL_W32(TBICSR, reg | TBINwEnable | TBINwRestart);
	else {
		printk(KERN_WARNING PFX
		       "%s: incorrect speed setting refused in TBI mode\n",
		       dev->name);
		ret = -EOPNOTSUPP;
	}

	return ret;
}

static int rtl8169_set_speed_xmii(struct net_device *dev,
				  u8 autoneg, u16 speed, u8 duplex)
{
	struct rtl8169_private *tp = netdev_priv(dev);
	void __iomem *ioaddr = tp->mmio_addr;
	int auto_nego, giga_ctrl;

	auto_nego = mdio_read(ioaddr, PHY_AUTO_NEGO_REG);
	auto_nego &= ~(PHY_Cap_10_Half | PHY_Cap_10_Full |
		       PHY_Cap_100_Half | PHY_Cap_100_Full);
	giga_ctrl = mdio_read(ioaddr, PHY_1000_CTRL_REG);
	giga_ctrl &= ~(PHY_Cap_1000_Full | PHY_Cap_Null);

	if (autoneg == AUTONEG_ENABLE) {
		auto_nego |= (PHY_Cap_10_Half | PHY_Cap_10_Full |
			      PHY_Cap_100_Half | PHY_Cap_100_Full);
		giga_ctrl |= PHY_Cap_1000_Full;
	} else {
		if (speed == SPEED_10)
			auto_nego |= PHY_Cap_10_Half | PHY_Cap_10_Full;
		else if (speed == SPEED_100)
			auto_nego |= PHY_Cap_100_Half | PHY_Cap_100_Full;
		else if (speed == SPEED_1000)
			giga_ctrl |= PHY_Cap_1000_Full;

		if (duplex == DUPLEX_HALF)
			auto_nego &= ~(PHY_Cap_10_Full | PHY_Cap_100_Full);
	}

	tp->phy_auto_nego_reg = auto_nego;
	tp->phy_1000_ctrl_reg = giga_ctrl;

	mdio_write(ioaddr, PHY_AUTO_NEGO_REG, auto_nego);
	mdio_write(ioaddr, PHY_1000_CTRL_REG, giga_ctrl);
	mdio_write(ioaddr, PHY_CTRL_REG, PHY_Enable_Auto_Nego |
					 PHY_Restart_Auto_Nego);
	return 0;
}

static int rtl8169_set_speed(struct net_device *dev,
			     u8 autoneg, u16 speed, u8 duplex)
{
	struct rtl8169_private *tp = netdev_priv(dev);
	int ret;

	ret = tp->set_speed(dev, autoneg, speed, duplex);

	if (netif_running(dev) && (tp->phy_1000_ctrl_reg & PHY_Cap_1000_Full))
		mod_timer(&tp->timer, jiffies + RTL8169_PHY_TIMEOUT);

	return ret;
}

static int rtl8169_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
	struct rtl8169_private *tp = netdev_priv(dev);
	unsigned long flags;
	int ret;

	spin_lock_irqsave(&tp->lock, flags);
	ret = rtl8169_set_speed(dev, cmd->autoneg, cmd->speed, cmd->duplex);
	spin_unlock_irqrestore(&tp->lock, flags);
	
	return ret;
}

static u32 rtl8169_get_rx_csum(struct net_device *dev)
{
	struct rtl8169_private *tp = netdev_priv(dev);

	return tp->cp_cmd & RxChkSum;
}

static int rtl8169_set_rx_csum(struct net_device *dev, u32 data)
{
	struct rtl8169_private *tp = netdev_priv(dev);
	void __iomem *ioaddr = tp->mmio_addr;
	unsigned long flags;

	spin_lock_irqsave(&tp->lock, flags);

	if (data)
		tp->cp_cmd |= RxChkSum;
	else
		tp->cp_cmd &= ~RxChkSum;

	RTL_W16(CPlusCmd, tp->cp_cmd);
	RTL_R16(CPlusCmd);

	spin_unlock_irqrestore(&tp->lock, flags);

	return 0;
}

#ifdef CONFIG_R8169_VLAN

static inline u32 rtl8169_tx_vlan_tag(struct rtl8169_private *tp,
				      struct sk_buff *skb)
{
	return (tp->vlgrp && vlan_tx_tag_present(skb)) ?
		TxVlanTag | swab16(vlan_tx_tag_get(skb)) : 0x00;
}

static void rtl8169_vlan_rx_register(struct net_device *dev,
				     struct vlan_group *grp)
{
	struct rtl8169_private *tp = netdev_priv(dev);
	void __iomem *ioaddr = tp->mmio_addr;
	unsigned long flags;

	spin_lock_irqsave(&tp->lock, flags);
	tp->vlgrp = grp;
	if (tp->vlgrp)
		tp->cp_cmd |= RxVlan;
	else
		tp->cp_cmd &= ~RxVlan;
	RTL_W16(CPlusCmd, tp->cp_cmd);
	RTL_R16(CPlusCmd);
	spin_unlock_irqrestore(&tp->lock, flags);
}

static void rtl8169_vlan_rx_kill_vid(struct net_device *dev, unsigned short vid)
{
	struct rtl8169_private *tp = netdev_priv(dev);
	unsigned long flags;

	spin_lock_irqsave(&tp->lock, flags);
	if (tp->vlgrp)
		tp->vlgrp->vlan_devices[vid] = NULL;
	spin_unlock_irqrestore(&tp->lock, flags);
}

static int rtl8169_rx_vlan_skb(struct rtl8169_private *tp, struct RxDesc *desc,
			       struct sk_buff *skb)
{
	u32 opts2 = le32_to_cpu(desc->opts2);
	int ret;

	if (tp->vlgrp && (opts2 & RxVlanTag)) {
		rtl8169_rx_hwaccel_skb(skb, tp->vlgrp,
				       swab16(opts2 & 0xffff));
		ret = 0;
	} else
		ret = -1;
	desc->opts2 = 0;
	return ret;
}

#else /* !CONFIG_R8169_VLAN */

static inline u32 rtl8169_tx_vlan_tag(struct rtl8169_private *tp,
				      struct sk_buff *skb)
{
	return 0;
}

static int rtl8169_rx_vlan_skb(struct rtl8169_private *tp, struct RxDesc *desc,
			       struct sk_buff *skb)
{
	return -1;
}

#endif

static void rtl8169_gset_tbi(struct net_device *dev, struct ethtool_cmd *cmd)
{
	struct rtl8169_private *tp = netdev_priv(dev);
	void __iomem *ioaddr = tp->mmio_addr;
	u32 status;

	cmd->supported =
		SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg | SUPPORTED_FIBRE;
	cmd->port = PORT_FIBRE;
	cmd->transceiver = XCVR_INTERNAL;

	status = RTL_R32(TBICSR);
	cmd->advertising = (status & TBINwEnable) ?  ADVERTISED_Autoneg : 0;
	cmd->autoneg = !!(status & TBINwEnable);

	cmd->speed = SPEED_1000;
	cmd->duplex = DUPLEX_FULL; /* Always set */
}

static void rtl8169_gset_xmii(struct net_device *dev, struct ethtool_cmd *cmd)
{
	struct rtl8169_private *tp = netdev_priv(dev);
	void __iomem *ioaddr = tp->mmio_addr;
	u8 status;

	cmd->supported = SUPPORTED_10baseT_Half |
			 SUPPORTED_10baseT_Full |
			 SUPPORTED_100baseT_Half |
			 SUPPORTED_100baseT_Full |
			 SUPPORTED_1000baseT_Full |
			 SUPPORTED_Autoneg |
		         SUPPORTED_TP;

	cmd->autoneg = 1;
	cmd->advertising = ADVERTISED_TP | ADVERTISED_Autoneg;

	if (tp->phy_auto_nego_reg & PHY_Cap_10_Half)
		cmd->advertising |= ADVERTISED_10baseT_Half;
	if (tp->phy_auto_nego_reg & PHY_Cap_10_Full)
		cmd->advertising |= ADVERTISED_10baseT_Full;
	if (tp->phy_auto_nego_reg & PHY_Cap_100_Half)
		cmd->advertising |= ADVERTISED_100baseT_Half;
	if (tp->phy_auto_nego_reg & PHY_Cap_100_Full)
		cmd->advertising |= ADVERTISED_100baseT_Full;
	if (tp->phy_1000_ctrl_reg & PHY_Cap_1000_Full)
		cmd->advertising |= ADVERTISED_1000baseT_Full;

	status = RTL_R8(PHYstatus);

	if (status & _1000bpsF)
		cmd->speed = SPEED_1000;
	else if (status & _100bps)
		cmd->speed = SPEED_100;
	else if (status & _10bps)
		cmd->speed = SPEED_10;

	cmd->duplex = ((status & _1000bpsF) || (status & FullDup)) ?
		      DUPLEX_FULL : DUPLEX_HALF;
}

static int rtl8169_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
	struct rtl8169_private *tp = netdev_priv(dev);
	unsigned long flags;

	spin_lock_irqsave(&tp->lock, flags);

	tp->get_settings(dev, cmd);

	spin_unlock_irqrestore(&tp->lock, flags);
	return 0;
}

static void rtl8169_get_regs(struct net_device *dev, struct ethtool_regs *regs,
			     void *p)
{
        struct rtl8169_private *tp = netdev_priv(dev);
        unsigned long flags;

        if (regs->len > R8169_REGS_SIZE)
        	regs->len = R8169_REGS_SIZE;

        spin_lock_irqsave(&tp->lock, flags);
        memcpy_fromio(p, tp->mmio_addr, regs->len);
        spin_unlock_irqrestore(&tp->lock, flags);
}

static struct ethtool_ops rtl8169_ethtool_ops = {
	.get_drvinfo		= rtl8169_get_drvinfo,
	.get_regs_len		= rtl8169_get_regs_len,
	.get_link		= ethtool_op_get_link,
	.get_settings		= rtl8169_get_settings,
	.set_settings		= rtl8169_set_settings,
	.get_rx_csum		= rtl8169_get_rx_csum,
	.set_rx_csum		= rtl8169_set_rx_csum,
	.get_tx_csum		= ethtool_op_get_tx_csum,
	.set_tx_csum		= ethtool_op_set_tx_csum,
	.get_sg			= ethtool_op_get_sg,
	.set_sg			= ethtool_op_set_sg,
	.get_tso		= ethtool_op_get_tso,
	.set_tso		= ethtool_op_set_tso,
	.get_regs		= rtl8169_get_regs,
};

static void rtl8169_write_gmii_reg_bit(void __iomem *ioaddr, int reg, int bitnum,
				       int bitval)
{
	int val;

	val = mdio_read(ioaddr, reg);
	val = (bitval == 1) ?
		val | (bitval << bitnum) :  val & ~(0x0001 << bitnum);
	mdio_write(ioaddr, reg, val & 0xffff); 
}

static void rtl8169_get_mac_version(struct rtl8169_private *tp, void __iomem *ioaddr)
{
	const struct {
		u32 mask;
		int mac_version;
	} mac_info[] = {
		{ 0x1 << 28,	RTL_GIGA_MAC_VER_X },
		{ 0x1 << 26,	RTL_GIGA_MAC_VER_E },
		{ 0x1 << 23,	RTL_GIGA_MAC_VER_D }, 
		{ 0x00000000,	RTL_GIGA_MAC_VER_B } /* Catch-all */
	}, *p = mac_info;
	u32 reg;

	reg = RTL_R32(TxConfig) & 0x7c800000;
	while ((reg & p->mask) != p->mask)
		p++;
	tp->mac_version = p->mac_version;
}

static void rtl8169_print_mac_version(struct rtl8169_private *tp)
{
	struct {
		int version;
		char *msg;
	} mac_print[] = {
		{ RTL_GIGA_MAC_VER_E, "RTL_GIGA_MAC_VER_E" },
		{ RTL_GIGA_MAC_VER_D, "RTL_GIGA_MAC_VER_D" },
		{ RTL_GIGA_MAC_VER_B, "RTL_GIGA_MAC_VER_B" },
		{ 0, NULL }
	}, *p;

	for (p = mac_print; p->msg; p++) {
		if (tp->mac_version == p->version) {
			dprintk("mac_version == %s (%04d)\n", p->msg,
				  p->version);
			return;
		}
	}
	dprintk("mac_version == Unknown\n");
}

static void rtl8169_get_phy_version(struct rtl8169_private *tp, void __iomem *ioaddr)
{
	const struct {
		u16 mask;
		u16 set;
		int phy_version;
	} phy_info[] = {
		{ 0x000f, 0x0002, RTL_GIGA_PHY_VER_G },
		{ 0x000f, 0x0001, RTL_GIGA_PHY_VER_F },
		{ 0x000f, 0x0000, RTL_GIGA_PHY_VER_E },
		{ 0x0000, 0x0000, RTL_GIGA_PHY_VER_D } /* Catch-all */
	}, *p = phy_info;
	u16 reg;

	reg = mdio_read(ioaddr, 3) & 0xffff;
	while ((reg & p->mask) != p->set)
		p++;
	tp->phy_version = p->phy_version;
}

static void rtl8169_print_phy_version(struct rtl8169_private *tp)
{
	struct {
		int version;
		char *msg;
		u32 reg;
	} phy_print[] = {
		{ RTL_GIGA_PHY_VER_G, "RTL_GIGA_PHY_VER_G", 0x0002 },
		{ RTL_GIGA_PHY_VER_F, "RTL_GIGA_PHY_VER_F", 0x0001 },
		{ RTL_GIGA_PHY_VER_E, "RTL_GIGA_PHY_VER_E", 0x0000 },
		{ RTL_GIGA_PHY_VER_D, "RTL_GIGA_PHY_VER_D", 0x0000 },
		{ 0, NULL, 0x0000 }
	}, *p;

	for (p = phy_print; p->msg; p++) {
		if (tp->phy_version == p->version) {
			dprintk("phy_version == %s (%04x)\n", p->msg, p->reg);
			return;
		}
	}
	dprintk("phy_version == Unknown\n");
}

static void rtl8169_hw_phy_config(struct net_device *dev)
{
	struct rtl8169_private *tp = netdev_priv(dev);
	void __iomem *ioaddr = tp->mmio_addr;
	struct {
		u16 regs[5]; /* Beware of bit-sign propagation */
	} phy_magic[5] = { {
		{ 0x0000,	//w 4 15 12 0
		  0x00a1,	//w 3 15 0 00a1
		  0x0008,	//w 2 15 0 0008
		  0x1020,	//w 1 15 0 1020
		  0x1000 } },{	//w 0 15 0 1000
		{ 0x7000,	//w 4 15 12 7
		  0xff41,	//w 3 15 0 ff41
		  0xde60,	//w 2 15 0 de60
		  0x0140,	//w 1 15 0 0140
		  0x0077 } },{	//w 0 15 0 0077
		{ 0xa000,	//w 4 15 12 a
		  0xdf01,	//w 3 15 0 df01
		  0xdf20,	//w 2 15 0 df20
		  0xff95,	//w 1 15 0 ff95
		  0xfa00 } },{	//w 0 15 0 fa00
		{ 0xb000,	//w 4 15 12 b
		  0xff41,	//w 3 15 0 ff41
		  0xde20,	//w 2 15 0 de20
		  0x0140,	//w 1 15 0 0140
		  0x00bb } },{	//w 0 15 0 00bb
		{ 0xf000,	//w 4 15 12 f
		  0xdf01,	//w 3 15 0 df01
		  0xdf20,	//w 2 15 0 df20
		  0xff95,	//w 1 15 0 ff95
		  0xbf00 }	//w 0 15 0 bf00
		}
	}, *p = phy_magic;
	int i;

	rtl8169_print_mac_version(tp);
	rtl8169_print_phy_version(tp);

	if (tp->mac_version <= RTL_GIGA_MAC_VER_B)
		return;
	if (tp->phy_version >= RTL_GIGA_PHY_VER_H)
		return;

	dprintk("MAC version != 0 && PHY version == 0 or 1\n");
	dprintk("Do final_reg2.cfg\n");

	/* Shazam ! */

	if (tp->mac_version == RTL_GIGA_MAC_VER_X) {
		mdio_write(ioaddr, 31, 0x0001);
		mdio_write(ioaddr,  9, 0x273a);
		mdio_write(ioaddr, 14, 0x7bfb);
		mdio_write(ioaddr, 27, 0x841e);

		mdio_write(ioaddr, 31, 0x0002);
		mdio_write(ioaddr,  1, 0x90d0);
		mdio_write(ioaddr, 31, 0x0000);
		return;
	}

	/* phy config for RTL8169s mac_version C chip */
	mdio_write(ioaddr, 31, 0x0001);			//w 31 2 0 1
	mdio_write(ioaddr, 21, 0x1000);			//w 21 15 0 1000
	mdio_write(ioaddr, 24, 0x65c7);			//w 24 15 0 65c7
	rtl8169_write_gmii_reg_bit(ioaddr, 4, 11, 0);	//w 4 11 11 0

	for (i = 0; i < ARRAY_SIZE(phy_magic); i++, p++) {
		int val, pos = 4;

		val = (mdio_read(ioaddr, pos) & 0x0fff) | (p->regs[0] & 0xffff);
		mdio_write(ioaddr, pos, val);
		while (--pos >= 0)
			mdio_write(ioaddr, pos, p->regs[4 - pos] & 0xffff);
		rtl8169_write_gmii_reg_bit(ioaddr, 4, 11, 1); //w 4 11 11 1
		rtl8169_write_gmii_reg_bit(ioaddr, 4, 11, 0); //w 4 11 11 0
	}
	mdio_write(ioaddr, 31, 0x0000); //w 31 2 0 0
}

static void rtl8169_phy_timer(unsigned long __opaque)
{
	struct net_device *dev = (struct net_device *)__opaque;
	struct rtl8169_private *tp = netdev_priv(dev);
	struct timer_list *timer = &tp->timer;
	void __iomem *ioaddr = tp->mmio_addr;
	unsigned long timeout = RTL8169_PHY_TIMEOUT;

	assert(tp->mac_version > RTL_GIGA_MAC_VER_B);
	assert(tp->phy_version < RTL_GIGA_PHY_VER_H);

	if (!(tp->phy_1000_ctrl_reg & PHY_Cap_1000_Full))
		return;

	spin_lock_irq(&tp->lock);

	if (tp->phy_reset_pending(ioaddr)) {
		/* 
		 * A busy loop could burn quite a few cycles on nowadays CPU.
		 * Let's delay the execution of the timer for a few ticks.
		 */
		timeout = HZ/10;
		goto out_mod_timer;
	}

	if (tp->link_ok(ioaddr))
		goto out_unlock;

	printk(KERN_WARNING PFX "%s: PHY reset until link up\n", dev->name);

	tp->phy_reset_enable(ioaddr);

out_mod_timer:
	mod_timer(timer, jiffies + timeout);
out_unlock:
	spin_unlock_irq(&tp->lock);
}

static inline void rtl8169_delete_timer(struct net_device *dev)
{
	struct rtl8169_private *tp = netdev_priv(dev);
	struct timer_list *timer = &tp->timer;

	if ((tp->mac_version <= RTL_GIGA_MAC_VER_B) ||
	    (tp->phy_version >= RTL_GIGA_PHY_VER_H))
		return;

	del_timer_sync(timer);
}

static inline void rtl8169_request_timer(struct net_device *dev)
{
	struct rtl8169_private *tp = netdev_priv(dev);
	struct timer_list *timer = &tp->timer;

	if ((tp->mac_version <= RTL_GIGA_MAC_VER_B) ||
	    (tp->phy_version >= RTL_GIGA_PHY_VER_H))
		return;

	init_timer(timer);
	timer->expires = jiffies + RTL8169_PHY_TIMEOUT;
	timer->data = (unsigned long)(dev);
	timer->function = rtl8169_phy_timer;
	add_timer(timer);
}

#ifdef CONFIG_NET_POLL_CONTROLLER
/*
 * Polling 'interrupt' - used by things like netconsole to send skbs
 * without having to re-enable interrupts. It's not called while
 * the interrupt routine is executing.
 */
static void rtl8169_netpoll(struct net_device *dev)
{
	struct rtl8169_private *tp = netdev_priv(dev);
	struct pci_dev *pdev = tp->pci_dev;

	disable_irq(pdev->irq);
	rtl8169_interrupt(pdev->irq, dev, NULL);
	enable_irq(pdev->irq);
}
#endif

static void rtl8169_release_board(struct pci_dev *pdev, struct net_device *dev,
				  void __iomem *ioaddr)
{
	iounmap(ioaddr);
	pci_release_regions(pdev);
	pci_disable_device(pdev);
	free_netdev(dev);
}

static int __devinit
rtl8169_init_board(struct pci_dev *pdev, struct net_device **dev_out,
		   void __iomem **ioaddr_out)
{
	void __iomem *ioaddr;
	struct net_device *dev;
	struct rtl8169_private *tp;
	int rc = -ENOMEM, i, acpi_idle_state = 0, pm_cap;

	assert(ioaddr_out != NULL);

	/* dev zeroed in alloc_etherdev */
	dev = alloc_etherdev(sizeof (*tp));
	if (dev == NULL) {
		printk(KERN_ERR PFX "unable to alloc new ethernet\n");
		goto err_out;
	}

	SET_MODULE_OWNER(dev);
	SET_NETDEV_DEV(dev, &pdev->dev);
	tp = netdev_priv(dev);

	/* enable device (incl. PCI PM wakeup and hotplug setup) */
	rc = pci_enable_device(pdev);
	if (rc) {
		printk(KERN_ERR PFX "%s: enable failure\n", pci_name(pdev));
		goto err_out_free_dev;
	}

	rc = pci_set_mwi(pdev);
	if (rc < 0)
		goto err_out_disable;

	/* save power state before pci_enable_device overwrites it */
	pm_cap = pci_find_capability(pdev, PCI_CAP_ID_PM);
	if (pm_cap) {
		u16 pwr_command;

		pci_read_config_word(pdev, pm_cap + PCI_PM_CTRL, &pwr_command);
		acpi_idle_state = pwr_command & PCI_PM_CTRL_STATE_MASK;
	} else {
		printk(KERN_ERR PFX
		       "Cannot find PowerManagement capability, aborting.\n");
		goto err_out_mwi;
	}

	/* make sure PCI base addr 1 is MMIO */
	if (!(pci_resource_flags(pdev, 1) & IORESOURCE_MEM)) {
		printk(KERN_ERR PFX
		       "region #1 not an MMIO resource, aborting\n");
		rc = -ENODEV;
		goto err_out_mwi;
	}
	/* check for weird/broken PCI region reporting */
	if (pci_resource_len(pdev, 1) < R8169_REGS_SIZE) {
		printk(KERN_ERR PFX "Invalid PCI region size(s), aborting\n");
		rc = -ENODEV;
		goto err_out_mwi;
	}

	rc = pci_request_regions(pdev, MODULENAME);
	if (rc) {
		printk(KERN_ERR PFX "%s: could not request regions.\n",
		       pci_name(pdev));
		goto err_out_mwi;
	}

	tp->cp_cmd = PCIMulRW | RxChkSum;

	if ((sizeof(dma_addr_t) > 4) &&
	    !pci_set_dma_mask(pdev, DMA_64BIT_MASK) && use_dac) {
		tp->cp_cmd |= PCIDAC;
		dev->features |= NETIF_F_HIGHDMA;
	} else {
		rc = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
		if (rc < 0) {
			printk(KERN_ERR PFX "DMA configuration failed.\n");
			goto err_out_free_res;
		}
	}

	pci_set_master(pdev);

	/* ioremap MMIO region */
	ioaddr = ioremap(pci_resource_start(pdev, 1), R8169_REGS_SIZE);
	if (ioaddr == NULL) {
		printk(KERN_ERR PFX "cannot remap MMIO, aborting\n");
		rc = -EIO;
		goto err_out_free_res;
	}

	/* Unneeded ? Don't mess with Mrs. Murphy. */
	rtl8169_irq_mask_and_ack(ioaddr);

	/* Soft reset the chip. */
	RTL_W8(ChipCmd, CmdReset);

	/* Check that the chip has finished the reset. */
	for (i = 1000; i > 0; i--) {
		if ((RTL_R8(ChipCmd) & CmdReset) == 0)
			break;
		udelay(10);
	}

	/* Identify chip attached to board */
	rtl8169_get_mac_version(tp, ioaddr);
	rtl8169_get_phy_version(tp, ioaddr);

	rtl8169_print_mac_version(tp);
	rtl8169_print_phy_version(tp);

	for (i = ARRAY_SIZE(rtl_chip_info) - 1; i >= 0; i--) {
		if (tp->mac_version == rtl_chip_info[i].mac_version)
			break;
	}
	if (i < 0) {
		/* Unknown chip: assume array element #0, original RTL-8169 */
		printk(KERN_DEBUG PFX
		       "PCI device %s: unknown chip version, assuming %s\n",
		       pci_name(pdev), rtl_chip_info[0].name);
		i++;
	}
	tp->chipset = i;

	*ioaddr_out = ioaddr;
	*dev_out = dev;
out:
	return rc;

err_out_free_res:
	pci_release_regions(pdev);

err_out_mwi:
	pci_clear_mwi(pdev);

err_out_disable:
	pci_disable_device(pdev);

err_out_free_dev:
	free_netdev(dev);
err_out:
	*ioaddr_out = NULL;
	*dev_out = NULL;
	goto out;
}

static int __devinit
rtl8169_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	struct net_device *dev = NULL;
	struct rtl8169_private *tp;
	void __iomem *ioaddr = NULL;
	static int board_idx = -1;
	static int printed_version = 0;
	u8 autoneg, duplex;
	u16 speed;
	int i, rc;

	assert(pdev != NULL);
	assert(ent != NULL);

	board_idx++;

	if (!printed_version) {
		printk(KERN_INFO "%s Gigabit Ethernet driver %s loaded\n",
		       MODULENAME, RTL8169_VERSION);
		printed_version = 1;
	}

	rc = rtl8169_init_board(pdev, &dev, &ioaddr);
	if (rc)
		return rc;

	tp = netdev_priv(dev);
	assert(ioaddr != NULL);

	if (RTL_R8(PHYstatus) & TBI_Enable) {
		tp->set_speed = rtl8169_set_speed_tbi;
		tp->get_settings = rtl8169_gset_tbi;
		tp->phy_reset_enable = rtl8169_tbi_reset_enable;
		tp->phy_reset_pending = rtl8169_tbi_reset_pending;
		tp->link_ok = rtl8169_tbi_link_ok;

		tp->phy_1000_ctrl_reg = PHY_Cap_1000_Full; /* Implied by TBI */
	} else {
		tp->set_speed = rtl8169_set_speed_xmii;
		tp->get_settings = rtl8169_gset_xmii;
		tp->phy_reset_enable = rtl8169_xmii_reset_enable;
		tp->phy_reset_pending = rtl8169_xmii_reset_pending;
		tp->link_ok = rtl8169_xmii_link_ok;
	}

	/* Get MAC address.  FIXME: read EEPROM */
	for (i = 0; i < MAC_ADDR_LEN; i++)
		dev->dev_addr[i] = RTL_R8(MAC0 + i);

	dev->open = rtl8169_open;
	dev->hard_start_xmit = rtl8169_start_xmit;
	dev->get_stats = rtl8169_get_stats;
	SET_ETHTOOL_OPS(dev, &rtl8169_ethtool_ops);
	dev->stop = rtl8169_close;
	dev->tx_timeout = rtl8169_tx_timeout;
	dev->set_multicast_list = rtl8169_set_rx_mode;
	dev->watchdog_timeo = RTL8169_TX_TIMEOUT;
	dev->irq = pdev->irq;
	dev->base_addr = (unsigned long) ioaddr;
	dev->change_mtu = rtl8169_change_mtu;

#ifdef CONFIG_R8169_NAPI
	dev->poll = rtl8169_poll;
	dev->weight = R8169_NAPI_WEIGHT;
	printk(KERN_INFO PFX "NAPI enabled\n");
#endif

#ifdef CONFIG_R8169_VLAN
	dev->features |= NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX;
	dev->vlan_rx_register = rtl8169_vlan_rx_register;
	dev->vlan_rx_kill_vid = rtl8169_vlan_rx_kill_vid;
#endif

#ifdef CONFIG_NET_POLL_CONTROLLER
	dev->poll_controller = rtl8169_netpoll;
#endif

	tp->intr_mask = 0xffff;
	tp->pci_dev = pdev;
	tp->mmio_addr = ioaddr;

	spin_lock_init(&tp->lock);

	rc = register_netdev(dev);
	if (rc) {
		rtl8169_release_board(pdev, dev, ioaddr);
		return rc;
	}

	printk(KERN_DEBUG "%s: Identified chip type is '%s'.\n", dev->name,
	       rtl_chip_info[tp->chipset].name);

	pci_set_drvdata(pdev, dev);

	printk(KERN_INFO "%s: %s at 0x%lx, "
	       "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x, "
	       "IRQ %d\n",
	       dev->name,
	       rtl_chip_info[ent->driver_data].name,
	       dev->base_addr,
	       dev->dev_addr[0], dev->dev_addr[1],
	       dev->dev_addr[2], dev->dev_addr[3],
	       dev->dev_addr[4], dev->dev_addr[5], dev->irq);

	rtl8169_hw_phy_config(dev);

	dprintk("Set MAC Reg C+CR Offset 0x82h = 0x01h\n");
	RTL_W8(0x82, 0x01);

	if (tp->mac_version < RTL_GIGA_MAC_VER_E) {
		dprintk("Set PCI Latency=0x40\n");
		pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 0x40);
	}

	if (tp->mac_version == RTL_GIGA_MAC_VER_D) {
		dprintk("Set MAC Reg C+CR Offset 0x82h = 0x01h\n");
		RTL_W8(0x82, 0x01);
		dprintk("Set PHY Reg 0x0bh = 0x00h\n");
		mdio_write(ioaddr, 0x0b, 0x0000); //w 0x0b 15 0 0
	}

	rtl8169_link_option(board_idx, &autoneg, &speed, &duplex);

	rtl8169_set_speed(dev, autoneg, speed, duplex);
	
	if (RTL_R8(PHYstatus) & TBI_Enable)
		printk(KERN_INFO PFX "%s: TBI auto-negotiating\n", dev->name);

	return 0;
}

static void __devexit
rtl8169_remove_one(struct pci_dev *pdev)
{
	struct net_device *dev = pci_get_drvdata(pdev);
	struct rtl8169_private *tp = netdev_priv(dev);

	assert(dev != NULL);
	assert(tp != NULL);

	unregister_netdev(dev);
	rtl8169_release_board(pdev, dev, tp->mmio_addr);
	pci_set_drvdata(pdev, NULL);
}

#ifdef CONFIG_PM

static int rtl8169_suspend(struct pci_dev *pdev, pm_message_t state)
{
	struct net_device *dev = pci_get_drvdata(pdev);
	struct rtl8169_private *tp = netdev_priv(dev);
	void __iomem *ioaddr = tp->mmio_addr;
	unsigned long flags;

	if (!netif_running(dev))
		return 0;
	
	netif_device_detach(dev);
	netif_stop_queue(dev);
	spin_lock_irqsave(&tp->lock, flags);

	/* Disable interrupts, stop Rx and Tx */
	RTL_W16(IntrMask, 0);
	RTL_W8(ChipCmd, 0);
		
	/* Update the error counts. */
	tp->stats.rx_missed_errors += RTL_R32(RxMissed);
	RTL_W32(RxMissed, 0);
	spin_unlock_irqrestore(&tp->lock, flags);
	
	return 0;
}

static int rtl8169_resume(struct pci_dev *pdev)
{
	struct net_device *dev = pci_get_drvdata(pdev);

	if (!netif_running(dev))
	    return 0;

	netif_device_attach(dev);
	rtl8169_hw_start(dev);

	return 0;
}
                                                                                
#endif /* CONFIG_PM */

static void rtl8169_set_rxbufsize(struct rtl8169_private *tp,
				  struct net_device *dev)
{
	unsigned int mtu = dev->mtu;

	tp->rx_buf_sz = (mtu > RX_BUF_SIZE) ? mtu + ETH_HLEN + 8 : RX_BUF_SIZE;
}

static int rtl8169_open(struct net_device *dev)
{
	struct rtl8169_private *tp = netdev_priv(dev);
	struct pci_dev *pdev = tp->pci_dev;
	int retval;

	rtl8169_set_rxbufsize(tp, dev);

	retval =
	    request_irq(dev->irq, rtl8169_interrupt, SA_SHIRQ, dev->name, dev);
	if (retval < 0)
		goto out;

	retval = -ENOMEM;

	/*
	 * Rx and Tx desscriptors needs 256 bytes alignment.
	 * pci_alloc_consistent provides more.
	 */
	tp->TxDescArray = pci_alloc_consistent(pdev, R8169_TX_RING_BYTES,
					       &tp->TxPhyAddr);
	if (!tp->TxDescArray)
		goto err_free_irq;

	tp->RxDescArray = pci_alloc_consistent(pdev, R8169_RX_RING_BYTES,
					       &tp->RxPhyAddr);
	if (!tp->RxDescArray)
		goto err_free_tx;

	retval = rtl8169_init_ring(dev);
	if (retval < 0)
		goto err_free_rx;

	INIT_WORK(&tp->task, NULL, dev);

	rtl8169_hw_start(dev);

	rtl8169_request_timer(dev);

	rtl8169_check_link_status(dev, tp, tp->mmio_addr);
out:
	return retval;

err_free_rx:
	pci_free_consistent(pdev, R8169_RX_RING_BYTES, tp->RxDescArray,
			    tp->RxPhyAddr);
err_free_tx:
	pci_free_consistent(pdev, R8169_TX_RING_BYTES, tp->TxDescArray,
			    tp->TxPhyAddr);
err_free_irq:
	free_irq(dev->irq, dev);
	goto out;
}

static void rtl8169_hw_reset(void __iomem *ioaddr)
{
	/* Disable interrupts */
	rtl8169_irq_mask_and_ack(ioaddr);

	/* Reset the chipset */
	RTL_W8(ChipCmd, CmdReset);

	/* PCI commit */
	RTL_R8(ChipCmd);
}

static void
rtl8169_hw_start(struct net_device *dev)
{
	struct rtl8169_private *tp = netdev_priv(dev);
	void __iomem *ioaddr = tp->mmio_addr;
	u32 i;

	/* Soft reset the chip. */
	RTL_W8(ChipCmd, CmdReset);

	/* Check that the chip has finished the reset. */
	for (i = 1000; i > 0; i--) {
		if ((RTL_R8(ChipCmd) & CmdReset) == 0)
			break;
		udelay(10);
	}

	RTL_W8(Cfg9346, Cfg9346_Unlock);
	RTL_W8(ChipCmd, CmdTxEnb | CmdRxEnb);
	RTL_W8(EarlyTxThres, EarlyTxThld);

	/* For gigabit rtl8169, MTU + header + CRC + VLAN */
	RTL_W16(RxMaxSize, tp->rx_buf_sz);

	/* Set Rx Config register */
	i = rtl8169_rx_config |
		(RTL_R32(RxConfig) & rtl_chip_info[tp->chipset].RxConfigMask);
	RTL_W32(RxConfig, i);

	/* Set DMA burst size and Interframe Gap Time */
	RTL_W32(TxConfig,
		(TX_DMA_BURST << TxDMAShift) | (InterFrameGap <<
						TxInterFrameGapShift));
	tp->cp_cmd |= RTL_R16(CPlusCmd);
	RTL_W16(CPlusCmd, tp->cp_cmd);

	if ((tp->mac_version == RTL_GIGA_MAC_VER_D) ||
	    (tp->mac_version == RTL_GIGA_MAC_VER_E)) {
		dprintk(KERN_INFO PFX "Set MAC Reg C+CR Offset 0xE0. "
			"Bit-3 and bit-14 MUST be 1\n");
		tp->cp_cmd |= (1 << 14) | PCIMulRW;
		RTL_W16(CPlusCmd, tp->cp_cmd);
	}

	/*
	 * Undocumented corner. Supposedly:
	 * (TxTimer << 12) | (TxPackets << 8) | (RxTimer << 4) | RxPackets
	 */
	RTL_W16(IntrMitigate, 0x0000);

	RTL_W32(TxDescStartAddrLow, ((u64) tp->TxPhyAddr & DMA_32BIT_MASK));
	RTL_W32(TxDescStartAddrHigh, ((u64) tp->TxPhyAddr >> 32));
	RTL_W32(RxDescAddrLow, ((u64) tp->RxPhyAddr & DMA_32BIT_MASK));
	RTL_W32(RxDescAddrHigh, ((u64) tp->RxPhyAddr >> 32));
	RTL_W8(Cfg9346, Cfg9346_Lock);
	udelay(10);

	RTL_W32(RxMissed, 0);

	rtl8169_set_rx_mode(dev);

	/* no early-rx interrupts */
	RTL_W16(MultiIntr, RTL_R16(MultiIntr) & 0xF000);

	/* Enable all known interrupts by setting the interrupt mask. */
	RTL_W16(IntrMask, rtl8169_intr_mask);

	netif_start_queue(dev);
}

static int rtl8169_change_mtu(struct net_device *dev, int new_mtu)
{
	struct rtl8169_private *tp = netdev_priv(dev);
	int ret = 0;

	if (new_mtu < ETH_ZLEN || new_mtu > SafeMtu)
		return -EINVAL;

	dev->mtu = new_mtu;

	if (!netif_running(dev))
		goto out;

	rtl8169_down(dev);

	rtl8169_set_rxbufsize(tp, dev);

	ret = rtl8169_init_ring(dev);
	if (ret < 0)
		goto out;

	netif_poll_enable(dev);

	rtl8169_hw_start(dev);

	rtl8169_request_timer(dev);

out:
	return ret;
}

static inline void rtl8169_make_unusable_by_asic(struct RxDesc *desc)
{
	desc->addr = 0x0badbadbadbadbadull;
	desc->opts1 &= ~cpu_to_le32(DescOwn | RsvdMask);
}

static void rtl8169_free_rx_skb(struct rtl8169_private *tp,
				struct sk_buff **sk_buff, struct RxDesc *desc)
{
	struct pci_dev *pdev = tp->pci_dev;

	pci_unmap_single(pdev, le64_to_cpu(desc->addr), tp->rx_buf_sz,
			 PCI_DMA_FROMDEVICE);
	dev_kfree_skb(*sk_buff);
	*sk_buff = NULL;
	rtl8169_make_unusable_by_asic(desc);
}

static inline void rtl8169_mark_to_asic(struct RxDesc *desc, u32 rx_buf_sz)
{
	u32 eor = le32_to_cpu(desc->opts1) & RingEnd;

	desc->opts1 = cpu_to_le32(DescOwn | eor | rx_buf_sz);
}

static inline void rtl8169_map_to_asic(struct RxDesc *desc, dma_addr_t mapping,
				       u32 rx_buf_sz)
{
	desc->addr = cpu_to_le64(mapping);
	wmb();
	rtl8169_mark_to_asic(desc, rx_buf_sz);
}

static int rtl8169_alloc_rx_skb(struct pci_dev *pdev, struct sk_buff **sk_buff,
				struct RxDesc *desc, int rx_buf_sz)
{
	struct sk_buff *skb;
	dma_addr_t mapping;
	int ret = 0;

	skb = dev_alloc_skb(rx_buf_sz + NET_IP_ALIGN);
	if (!skb)
		goto err_out;

	skb_reserve(skb, NET_IP_ALIGN);
	*sk_buff = skb;

	mapping = pci_map_single(pdev, skb->tail, rx_buf_sz,
				 PCI_DMA_FROMDEVICE);

	rtl8169_map_to_asic(desc, mapping, rx_buf_sz);

out:
	return ret;

err_out:
	ret = -ENOMEM;
	rtl8169_make_unusable_by_asic(desc);
	goto out;
}

static void rtl8169_rx_clear(struct rtl8169_private *tp)
{
	int i;

	for (i = 0; i < NUM_RX_DESC; i++) {
		if (tp->Rx_skbuff[i]) {
			rtl8169_free_rx_skb(tp, tp->Rx_skbuff + i,
					    tp->RxDescArray + i);
		}
	}
}

static u32 rtl8169_rx_fill(struct rtl8169_private *tp, struct net_device *dev,
			   u32 start, u32 end)
{
	u32 cur;
	
	for (cur = start; end - cur > 0; cur++) {
		int ret, i = cur % NUM_RX_DESC;

		if (tp->Rx_skbuff[i])
			continue;
			
		ret = rtl8169_alloc_rx_skb(tp->pci_dev, tp->Rx_skbuff + i,
					   tp->RxDescArray + i, tp->rx_buf_sz);
		if (ret < 0)
			break;
	}
	return cur - start;
}

static inline void rtl8169_mark_as_last_descriptor(struct RxDesc *desc)
{
	desc->opts1 |= cpu_to_le32(RingEnd);
}

static void rtl8169_init_ring_indexes(struct rtl8169_private *tp)
{
	tp->dirty_tx = tp->dirty_rx = tp->cur_tx = tp->cur_rx = 0;
}

static int rtl8169_init_ring(struct net_device *dev)
{
	struct rtl8169_private *tp = netdev_priv(dev);

	rtl8169_init_ring_indexes(tp);

	memset(tp->tx_skb, 0x0, NUM_TX_DESC * sizeof(struct ring_info));
	memset(tp->Rx_skbuff, 0x0, NUM_RX_DESC * sizeof(struct sk_buff *));

	if (rtl8169_rx_fill(tp, dev, 0, NUM_RX_DESC) != NUM_RX_DESC)
		goto err_out;

	rtl8169_mark_as_last_descriptor(tp->RxDescArray + NUM_RX_DESC - 1);

	return 0;

err_out:
	rtl8169_rx_clear(tp);
	return -ENOMEM;
}

static void rtl8169_unmap_tx_skb(struct pci_dev *pdev, struct ring_info *tx_skb,
				 struct TxDesc *desc)
{
	unsigned int len = tx_skb->len;

	pci_unmap_single(pdev, le64_to_cpu(desc->addr), len, PCI_DMA_TODEVICE);
	desc->opts1 = 0x00;
	desc->opts2 = 0x00;
	desc->addr = 0x00;
	tx_skb->len = 0;
}

static void rtl8169_tx_clear(struct rtl8169_private *tp)
{
	unsigned int i;

	for (i = tp->dirty_tx; i < tp->dirty_tx + NUM_TX_DESC; i++) {
		unsigned int entry = i % NUM_TX_DESC;
		struct ring_info *tx_skb = tp->tx_skb + entry;
		unsigned int len = tx_skb->len;

		if (len) {
			struct sk_buff *skb = tx_skb->skb;

			rtl8169_unmap_tx_skb(tp->pci_dev, tx_skb,
					     tp->TxDescArray + entry);
			if (skb) {
				dev_kfree_skb(skb);
				tx_skb->skb = NULL;
			}
			tp->stats.tx_dropped++;
		}
	}
	tp->cur_tx = tp->dirty_tx = 0;
}

static void rtl8169_schedule_work(struct net_device *dev, void (*task)(void *))
{
	struct rtl8169_private *tp = netdev_priv(dev);

	PREPARE_WORK(&tp->task, task, dev);
	schedule_delayed_work(&tp->task, 4);
}

static void rtl8169_wait_for_quiescence(struct net_device *dev)
{
	struct rtl8169_private *tp = netdev_priv(dev);
	void __iomem *ioaddr = tp->mmio_addr;

	synchronize_irq(dev->irq);

	/* Wait for any pending NAPI task to complete */
	netif_poll_disable(dev);

	rtl8169_irq_mask_and_ack(ioaddr);

	netif_poll_enable(dev);
}

static void rtl8169_reinit_task(void *_data)
{
	struct net_device *dev = _data;
	int ret;

	if (netif_running(dev)) {
		rtl8169_wait_for_quiescence(dev);
		rtl8169_close(dev);
	}

	ret = rtl8169_open(dev);
	if (unlikely(ret < 0)) {
		if (net_ratelimit()) {
			printk(PFX KERN_ERR "%s: reinit failure (status = %d)."
			       " Rescheduling.\n", dev->name, ret);
		}
		rtl8169_schedule_work(dev, rtl8169_reinit_task);
	}
}

static void rtl8169_reset_task(void *_data)
{
	struct net_device *dev = _data;
	struct rtl8169_private *tp = netdev_priv(dev);

	if (!netif_running(dev))
		return;

	rtl8169_wait_for_quiescence(dev);

	rtl8169_rx_interrupt(dev, tp, tp->mmio_addr);
	rtl8169_tx_clear(tp);

	if (tp->dirty_rx == tp->cur_rx) {
		rtl8169_init_ring_indexes(tp);
		rtl8169_hw_start(dev);
		netif_wake_queue(dev);
	} else {
		if (net_ratelimit()) {
			printk(PFX KERN_EMERG "%s: Rx buffers shortage\n",
			       dev->name);
		}
		rtl8169_schedule_work(dev, rtl8169_reset_task);
	}
}

static void rtl8169_tx_timeout(struct net_device *dev)
{
	struct rtl8169_private *tp = netdev_priv(dev);

	rtl8169_hw_reset(tp->mmio_addr);

	/* Let's wait a bit while any (async) irq lands on */
	rtl8169_schedule_work(dev, rtl8169_reset_task);
}

static int rtl8169_xmit_frags(struct rtl8169_private *tp, struct sk_buff *skb,
			      u32 opts1)
{
	struct skb_shared_info *info = skb_shinfo(skb);
	unsigned int cur_frag, entry;
	struct TxDesc *txd;

	entry = tp->cur_tx;
	for (cur_frag = 0; cur_frag < info->nr_frags; cur_frag++) {
		skb_frag_t *frag = info->frags + cur_frag;
		dma_addr_t mapping;
		u32 status, len;
		void *addr;

		entry = (entry + 1) % NUM_TX_DESC;

		txd = tp->TxDescArray + entry;
		len = frag->size;
		addr = ((void *) page_address(frag->page)) + frag->page_offset;
		mapping = pci_map_single(tp->pci_dev, addr, len, PCI_DMA_TODEVICE);

		/* anti gcc 2.95.3 bugware (sic) */
		status = opts1 | len | (RingEnd * !((entry + 1) % NUM_TX_DESC));

		txd->opts1 = cpu_to_le32(status);
		txd->addr = cpu_to_le64(mapping);

		tp->tx_skb[entry].len = len;
	}

	if (cur_frag) {
		tp->tx_skb[entry].skb = skb;
		txd->opts1 |= cpu_to_le32(LastFrag);
	}

	return cur_frag;
}

static inline u32 rtl8169_tso_csum(struct sk_buff *skb, struct net_device *dev)
{
	if (dev->features & NETIF_F_TSO) {
		u32 mss = skb_shinfo(skb)->tso_size;

		if (mss)
			return LargeSend | ((mss & MSSMask) << MSSShift);
	}
	if (skb->ip_summed == CHECKSUM_HW) {
		const struct iphdr *ip = skb->nh.iph;

		if (ip->protocol == IPPROTO_TCP)
			return IPCS | TCPCS;
		else if (ip->protocol == IPPROTO_UDP)
			return IPCS | UDPCS;
		WARN_ON(1);	/* we need a WARN() */
	}
	return 0;
}

static int rtl8169_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct rtl8169_private *tp = netdev_priv(dev);
	unsigned int frags, entry = tp->cur_tx % NUM_TX_DESC;
	struct TxDesc *txd = tp->TxDescArray + entry;
	void __iomem *ioaddr = tp->mmio_addr;
	dma_addr_t mapping;
	u32 status, len;
	u32 opts1;
	int ret = 0;
	
	if (unlikely(TX_BUFFS_AVAIL(tp) < skb_shinfo(skb)->nr_frags)) {
		printk(KERN_ERR PFX "%s: BUG! Tx Ring full when queue awake!\n",
		       dev->name);
		goto err_stop;
	}

	if (unlikely(le32_to_cpu(txd->opts1) & DescOwn))
		goto err_stop;

	opts1 = DescOwn | rtl8169_tso_csum(skb, dev);

	frags = rtl8169_xmit_frags(tp, skb, opts1);
	if (frags) {
		len = skb_headlen(skb);
		opts1 |= FirstFrag;
	} else {
		len = skb->len;

		if (unlikely(len < ETH_ZLEN)) {
			skb = skb_padto(skb, ETH_ZLEN);
			if (!skb)
				goto err_update_stats;
			len = ETH_ZLEN;
		}

		opts1 |= FirstFrag | LastFrag;
		tp->tx_skb[entry].skb = skb;
	}

	mapping = pci_map_single(tp->pci_dev, skb->data, len, PCI_DMA_TODEVICE);

	tp->tx_skb[entry].len = len;
	txd->addr = cpu_to_le64(mapping);
	txd->opts2 = cpu_to_le32(rtl8169_tx_vlan_tag(tp, skb));

	wmb();

	/* anti gcc 2.95.3 bugware (sic) */
	status = opts1 | len | (RingEnd * !((entry + 1) % NUM_TX_DESC));
	txd->opts1 = cpu_to_le32(status);

	dev->trans_start = jiffies;

	tp->cur_tx += frags + 1;

	smp_wmb();

	RTL_W8(TxPoll, 0x40);	/* set polling bit */

	if (TX_BUFFS_AVAIL(tp) < MAX_SKB_FRAGS) {
		netif_stop_queue(dev);
		smp_rmb();
		if (TX_BUFFS_AVAIL(tp) >= MAX_SKB_FRAGS)
			netif_wake_queue(dev);
	}

out:
	return ret;

err_stop:
	netif_stop_queue(dev);
	ret = 1;
err_update_stats:
	tp->stats.tx_dropped++;
	goto out;
}

static void rtl8169_pcierr_interrupt(struct net_device *dev)
{
	struct rtl8169_private *tp = netdev_priv(dev);
	struct pci_dev *pdev = tp->pci_dev;
	void __iomem *ioaddr = tp->mmio_addr;
	u16 pci_status, pci_cmd;

	pci_read_config_word(pdev, PCI_COMMAND, &pci_cmd);
	pci_read_config_word(pdev, PCI_STATUS, &pci_status);

	printk(KERN_ERR PFX "%s: PCI error (cmd = 0x%04x, status = 0x%04x).\n",
	       dev->name, pci_cmd, pci_status);

	/*
	 * The recovery sequence below admits a very elaborated explanation:
	 * - it seems to work;
	 * - I did not see what else could be done.
	 *
	 * Feel free to adjust to your needs.
	 */
	pci_write_config_word(pdev, PCI_COMMAND,
			      pci_cmd | PCI_COMMAND_SERR | PCI_COMMAND_PARITY);

	pci_write_config_word(pdev, PCI_STATUS,
		pci_status & (PCI_STATUS_DETECTED_PARITY |
		PCI_STATUS_SIG_SYSTEM_ERROR | PCI_STATUS_REC_MASTER_ABORT |
		PCI_STATUS_REC_TARGET_ABORT | PCI_STATUS_SIG_TARGET_ABORT));

	/* The infamous DAC f*ckup only happens at boot time */
	if ((tp->cp_cmd & PCIDAC) && !tp->dirty_rx && !tp->cur_rx) {
		printk(KERN_INFO PFX "%s: disabling PCI DAC.\n", dev->name);
		tp->cp_cmd &= ~PCIDAC;
		RTL_W16(CPlusCmd, tp->cp_cmd);
		dev->features &= ~NETIF_F_HIGHDMA;
		rtl8169_schedule_work(dev, rtl8169_reinit_task);
	}

	rtl8169_hw_reset(ioaddr);
}

static void
rtl8169_tx_interrupt(struct net_device *dev, struct rtl8169_private *tp,
		     void __iomem *ioaddr)
{
	unsigned int dirty_tx, tx_left;

	assert(dev != NULL);
	assert(tp != NULL);
	assert(ioaddr != NULL);

	dirty_tx = tp->dirty_tx;
	smp_rmb();
	tx_left = tp->cur_tx - dirty_tx;

	while (tx_left > 0) {
		unsigned int entry = dirty_tx % NUM_TX_DESC;
		struct ring_info *tx_skb = tp->tx_skb + entry;
		u32 len = tx_skb->len;
		u32 status;

		rmb();
		status = le32_to_cpu(tp->TxDescArray[entry].opts1);
		if (status & DescOwn)
			break;

		tp->stats.tx_bytes += len;
		tp->stats.tx_packets++;

		rtl8169_unmap_tx_skb(tp->pci_dev, tx_skb, tp->TxDescArray + entry);

		if (status & LastFrag) {
			dev_kfree_skb_irq(tx_skb->skb);
			tx_skb->skb = NULL;
		}
		dirty_tx++;
		tx_left--;
	}

	if (tp->dirty_tx != dirty_tx) {
		tp->dirty_tx = dirty_tx;
		smp_wmb();
		if (netif_queue_stopped(dev) &&
		    (TX_BUFFS_AVAIL(tp) >= MAX_SKB_FRAGS)) {
			netif_wake_queue(dev);
		}
	}
}

static inline void rtl8169_rx_csum(struct sk_buff *skb, struct RxDesc *desc)
{
	u32 opts1 = le32_to_cpu(desc->opts1);
	u32 status = opts1 & RxProtoMask;

	if (((status == RxProtoTCP) && !(opts1 & TCPFail)) ||
	    ((status == RxProtoUDP) && !(opts1 & UDPFail)) ||
	    ((status == RxProtoIP) && !(opts1 & IPFail)))
		skb->ip_summed = CHECKSUM_UNNECESSARY;
	else
		skb->ip_summed = CHECKSUM_NONE;
}

static inline int rtl8169_try_rx_copy(struct sk_buff **sk_buff, int pkt_size,
				      struct RxDesc *desc, int rx_buf_sz)
{
	int ret = -1;

	if (pkt_size < rx_copybreak) {
		struct sk_buff *skb;

		skb = dev_alloc_skb(pkt_size + NET_IP_ALIGN);
		if (skb) {
			skb_reserve(skb, NET_IP_ALIGN);
			eth_copy_and_sum(skb, sk_buff[0]->tail, pkt_size, 0);
			*sk_buff = skb;
			rtl8169_mark_to_asic(desc, rx_buf_sz);
			ret = 0;
		}
	}
	return ret;
}

static int
rtl8169_rx_interrupt(struct net_device *dev, struct rtl8169_private *tp,
		     void __iomem *ioaddr)
{
	unsigned int cur_rx, rx_left;
	unsigned int delta, count;

	assert(dev != NULL);
	assert(tp != NULL);
	assert(ioaddr != NULL);

	cur_rx = tp->cur_rx;
	rx_left = NUM_RX_DESC + tp->dirty_rx - cur_rx;
	rx_left = rtl8169_rx_quota(rx_left, (u32) dev->quota);

	while (rx_left > 0) {
		unsigned int entry = cur_rx % NUM_RX_DESC;
		u32 status;

		rmb();
		status = le32_to_cpu(tp->RxDescArray[entry].opts1);

		if (status & DescOwn)
			break;
		if (status & RxRES) {
			printk(KERN_INFO "%s: Rx ERROR!!!\n", dev->name);
			tp->stats.rx_errors++;
			if (status & (RxRWT | RxRUNT))
				tp->stats.rx_length_errors++;
			if (status & RxCRC)
				tp->stats.rx_crc_errors++;
		} else {
			struct RxDesc *desc = tp->RxDescArray + entry;
			struct sk_buff *skb = tp->Rx_skbuff[entry];
			int pkt_size = (status & 0x00001FFF) - 4;
			void (*pci_action)(struct pci_dev *, dma_addr_t,
				size_t, int) = pci_dma_sync_single_for_device;

			rtl8169_rx_csum(skb, desc);
			
			pci_dma_sync_single_for_cpu(tp->pci_dev,
				le64_to_cpu(desc->addr), tp->rx_buf_sz,
				PCI_DMA_FROMDEVICE);

			if (rtl8169_try_rx_copy(&skb, pkt_size, desc,
						tp->rx_buf_sz)) {
				pci_action = pci_unmap_single;
				tp->Rx_skbuff[entry] = NULL;
			}

			pci_action(tp->pci_dev, le64_to_cpu(desc->addr),
				   tp->rx_buf_sz, PCI_DMA_FROMDEVICE);

			skb->dev = dev;
			skb_put(skb, pkt_size);
			skb->protocol = eth_type_trans(skb, dev);

			if (rtl8169_rx_vlan_skb(tp, desc, skb) < 0)
				rtl8169_rx_skb(skb);

			dev->last_rx = jiffies;
			tp->stats.rx_bytes += pkt_size;
			tp->stats.rx_packets++;
		}
		
		cur_rx++; 
		rx_left--;
	}

	count = cur_rx - tp->cur_rx;
	tp->cur_rx = cur_rx;

	delta = rtl8169_rx_fill(tp, dev, tp->dirty_rx, tp->cur_rx);
	if (!delta && count)
		printk(KERN_INFO "%s: no Rx buffer allocated\n", dev->name);
	tp->dirty_rx += delta;

	/*
	 * FIXME: until there is periodic timer to try and refill the ring,
	 * a temporary shortage may definitely kill the Rx process.
	 * - disable the asic to try and avoid an overflow and kick it again
	 *   after refill ?
	 * - how do others driver handle this condition (Uh oh...).
	 */
	if (tp->dirty_rx + NUM_RX_DESC == tp->cur_rx)
		printk(KERN_EMERG "%s: Rx buffers exhausted\n", dev->name);

	return count;
}

/* The interrupt handler does all of the Rx thread work and cleans up after the Tx thread. */
static irqreturn_t
rtl8169_interrupt(int irq, void *dev_instance, struct pt_regs *regs)
{
	struct net_device *dev = (struct net_device *) dev_instance;
	struct rtl8169_private *tp = netdev_priv(dev);
	int boguscnt = max_interrupt_work;
	void __iomem *ioaddr = tp->mmio_addr;
	int status;
	int handled = 0;

	do {
		status = RTL_R16(IntrStatus);

		/* hotplug/major error/no more work/shared irq */
		if ((status == 0xFFFF) || !status)
			break;

		handled = 1;

		if (unlikely(!netif_running(dev))) {
			rtl8169_asic_down(ioaddr);
			goto out;
		}

		status &= tp->intr_mask;
		RTL_W16(IntrStatus,
			(status & RxFIFOOver) ? (status | RxOverflow) : status);

		if (!(status & rtl8169_intr_mask))
			break;

		if (unlikely(status & SYSErr)) {
			rtl8169_pcierr_interrupt(dev);
			break;
		}

		if (status & LinkChg)
			rtl8169_check_link_status(dev, tp, ioaddr);

#ifdef CONFIG_R8169_NAPI
		RTL_W16(IntrMask, rtl8169_intr_mask & ~rtl8169_napi_event);
		tp->intr_mask = ~rtl8169_napi_event;

		if (likely(netif_rx_schedule_prep(dev)))
			__netif_rx_schedule(dev);
		else {
			printk(KERN_INFO "%s: interrupt %04x taken in poll\n",
			       dev->name, status);	
		}
		break;
#else
		/* Rx interrupt */
		if (status & (RxOK | RxOverflow | RxFIFOOver)) {
			rtl8169_rx_interrupt(dev, tp, ioaddr);
		}
		/* Tx interrupt */
		if (status & (TxOK | TxErr))
			rtl8169_tx_interrupt(dev, tp, ioaddr);
#endif

		boguscnt--;
	} while (boguscnt > 0);

	if (boguscnt <= 0) {
		printk(KERN_WARNING "%s: Too much work at interrupt!\n",
		       dev->name);
		/* Clear all interrupt sources. */
		RTL_W16(IntrStatus, 0xffff);
	}
out:
	return IRQ_RETVAL(handled);
}

#ifdef CONFIG_R8169_NAPI
static int rtl8169_poll(struct net_device *dev, int *budget)
{
	unsigned int work_done, work_to_do = min(*budget, dev->quota);
	struct rtl8169_private *tp = netdev_priv(dev);
	void __iomem *ioaddr = tp->mmio_addr;

	work_done = rtl8169_rx_interrupt(dev, tp, ioaddr);
	rtl8169_tx_interrupt(dev, tp, ioaddr);

	*budget -= work_done;
	dev->quota -= work_done;

	if (work_done < work_to_do) {
		netif_rx_complete(dev);
		tp->intr_mask = 0xffff;
		/*
		 * 20040426: the barrier is not strictly required but the
		 * behavior of the irq handler could be less predictable
		 * without it. Btw, the lack of flush for the posted pci
		 * write is safe - FR
		 */
		smp_wmb();
		RTL_W16(IntrMask, rtl8169_intr_mask);
	}

	return (work_done >= work_to_do);
}
#endif

static void rtl8169_down(struct net_device *dev)
{
	struct rtl8169_private *tp = netdev_priv(dev);
	void __iomem *ioaddr = tp->mmio_addr;
	unsigned int poll_locked = 0;

	rtl8169_delete_timer(dev);

	netif_stop_queue(dev);

	flush_scheduled_work();

core_down:
	spin_lock_irq(&tp->lock);

	rtl8169_asic_down(ioaddr);

	/* Update the error counts. */
	tp->stats.rx_missed_errors += RTL_R32(RxMissed);
	RTL_W32(RxMissed, 0);

	spin_unlock_irq(&tp->lock);

	synchronize_irq(dev->irq);

	if (!poll_locked) {
		netif_poll_disable(dev);
		poll_locked++;
	}

	/* Give a racing hard_start_xmit a few cycles to complete. */
	synchronize_kernel();

	/*
	 * And now for the 50k$ question: are IRQ disabled or not ?
	 *
	 * Two paths lead here:
	 * 1) dev->close
	 *    -> netif_running() is available to sync the current code and the
	 *       IRQ handler. See rtl8169_interrupt for details.
	 * 2) dev->change_mtu
	 *    -> rtl8169_poll can not be issued again and re-enable the
	 *       interruptions. Let's simply issue the IRQ down sequence again.
	 */
	if (RTL_R16(IntrMask))
		goto core_down;

	rtl8169_tx_clear(tp);

	rtl8169_rx_clear(tp);
}

static int rtl8169_close(struct net_device *dev)
{
	struct rtl8169_private *tp = netdev_priv(dev);
	struct pci_dev *pdev = tp->pci_dev;

	rtl8169_down(dev);

	free_irq(dev->irq, dev);

	netif_poll_enable(dev);

	pci_free_consistent(pdev, R8169_RX_RING_BYTES, tp->RxDescArray,
			    tp->RxPhyAddr);
	pci_free_consistent(pdev, R8169_TX_RING_BYTES, tp->TxDescArray,
			    tp->TxPhyAddr);
	tp->TxDescArray = NULL;
	tp->RxDescArray = NULL;

	return 0;
}

static void
rtl8169_set_rx_mode(struct net_device *dev)
{
	struct rtl8169_private *tp = netdev_priv(dev);
	void __iomem *ioaddr = tp->mmio_addr;
	unsigned long flags;
	u32 mc_filter[2];	/* Multicast hash filter */
	int i, rx_mode;
	u32 tmp = 0;

	if (dev->flags & IFF_PROMISC) {
		/* Unconditionally log net taps. */
		printk(KERN_NOTICE "%s: Promiscuous mode enabled.\n",
		       dev->name);
		rx_mode =
		    AcceptBroadcast | AcceptMulticast | AcceptMyPhys |
		    AcceptAllPhys;
		mc_filter[1] = mc_filter[0] = 0xffffffff;
	} else if ((dev->mc_count > multicast_filter_limit)
		   || (dev->flags & IFF_ALLMULTI)) {
		/* Too many to filter perfectly -- accept all multicasts. */
		rx_mode = AcceptBroadcast | AcceptMulticast | AcceptMyPhys;
		mc_filter[1] = mc_filter[0] = 0xffffffff;
	} else {
		struct dev_mc_list *mclist;
		rx_mode = AcceptBroadcast | AcceptMyPhys;
		mc_filter[1] = mc_filter[0] = 0;
		for (i = 0, mclist = dev->mc_list; mclist && i < dev->mc_count;
		     i++, mclist = mclist->next) {
			int bit_nr = ether_crc(ETH_ALEN, mclist->dmi_addr) >> 26;
			mc_filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
			rx_mode |= AcceptMulticast;
		}
	}

	spin_lock_irqsave(&tp->lock, flags);

	tmp = rtl8169_rx_config | rx_mode |
	      (RTL_R32(RxConfig) & rtl_chip_info[tp->chipset].RxConfigMask);

	RTL_W32(RxConfig, tmp);
	RTL_W32(MAR0 + 0, mc_filter[0]);
	RTL_W32(MAR0 + 4, mc_filter[1]);

	spin_unlock_irqrestore(&tp->lock, flags);
}

/**
 *  rtl8169_get_stats - Get rtl8169 read/write statistics
 *  @dev: The Ethernet Device to get statistics for
 *
 *  Get TX/RX statistics for rtl8169
 */
static struct net_device_stats *rtl8169_get_stats(struct net_device *dev)
{
	struct rtl8169_private *tp = netdev_priv(dev);
	void __iomem *ioaddr = tp->mmio_addr;
	unsigned long flags;

	if (netif_running(dev)) {
		spin_lock_irqsave(&tp->lock, flags);
		tp->stats.rx_missed_errors += RTL_R32(RxMissed);
		RTL_W32(RxMissed, 0);
		spin_unlock_irqrestore(&tp->lock, flags);
	}
		
	return &tp->stats;
}

static struct pci_driver rtl8169_pci_driver = {
	.name		= MODULENAME,
	.id_table	= rtl8169_pci_tbl,
	.probe		= rtl8169_init_one,
	.remove		= __devexit_p(rtl8169_remove_one),
#ifdef CONFIG_PM
	.suspend	= rtl8169_suspend,
	.resume		= rtl8169_resume,
#endif
};

static int __init
rtl8169_init_module(void)
{
	return pci_module_init(&rtl8169_pci_driver);
}

static void __exit
rtl8169_cleanup_module(void)
{
	pci_unregister_driver(&rtl8169_pci_driver);
}

module_init(rtl8169_init_module);
module_exit(rtl8169_cleanup_module);