summaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/hw/mthca/mthca_cmd.c
blob: 3082b3b3d620aec288d0f5245be798f09a6f65bf (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
/*
 * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
 * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/completion.h>
#include <linux/pci.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <asm/io.h>
#include <rdma/ib_mad.h>

#include "mthca_dev.h"
#include "mthca_config_reg.h"
#include "mthca_cmd.h"
#include "mthca_memfree.h"

#define CMD_POLL_TOKEN 0xffff

enum {
	HCR_IN_PARAM_OFFSET    = 0x00,
	HCR_IN_MODIFIER_OFFSET = 0x08,
	HCR_OUT_PARAM_OFFSET   = 0x0c,
	HCR_TOKEN_OFFSET       = 0x14,
	HCR_STATUS_OFFSET      = 0x18,

	HCR_OPMOD_SHIFT        = 12,
	HCA_E_BIT              = 22,
	HCR_GO_BIT             = 23
};

enum {
	/* initialization and general commands */
	CMD_SYS_EN          = 0x1,
	CMD_SYS_DIS         = 0x2,
	CMD_MAP_FA          = 0xfff,
	CMD_UNMAP_FA        = 0xffe,
	CMD_RUN_FW          = 0xff6,
	CMD_MOD_STAT_CFG    = 0x34,
	CMD_QUERY_DEV_LIM   = 0x3,
	CMD_QUERY_FW        = 0x4,
	CMD_ENABLE_LAM      = 0xff8,
	CMD_DISABLE_LAM     = 0xff7,
	CMD_QUERY_DDR       = 0x5,
	CMD_QUERY_ADAPTER   = 0x6,
	CMD_INIT_HCA        = 0x7,
	CMD_CLOSE_HCA       = 0x8,
	CMD_INIT_IB         = 0x9,
	CMD_CLOSE_IB        = 0xa,
	CMD_QUERY_HCA       = 0xb,
	CMD_SET_IB          = 0xc,
	CMD_ACCESS_DDR      = 0x2e,
	CMD_MAP_ICM         = 0xffa,
	CMD_UNMAP_ICM       = 0xff9,
	CMD_MAP_ICM_AUX     = 0xffc,
	CMD_UNMAP_ICM_AUX   = 0xffb,
	CMD_SET_ICM_SIZE    = 0xffd,

	/* TPT commands */
	CMD_SW2HW_MPT 	    = 0xd,
	CMD_QUERY_MPT 	    = 0xe,
	CMD_HW2SW_MPT 	    = 0xf,
	CMD_READ_MTT        = 0x10,
	CMD_WRITE_MTT       = 0x11,
	CMD_SYNC_TPT        = 0x2f,

	/* EQ commands */
	CMD_MAP_EQ          = 0x12,
	CMD_SW2HW_EQ 	    = 0x13,
	CMD_HW2SW_EQ 	    = 0x14,
	CMD_QUERY_EQ        = 0x15,

	/* CQ commands */
	CMD_SW2HW_CQ 	    = 0x16,
	CMD_HW2SW_CQ 	    = 0x17,
	CMD_QUERY_CQ 	    = 0x18,
	CMD_RESIZE_CQ       = 0x2c,

	/* SRQ commands */
	CMD_SW2HW_SRQ 	    = 0x35,
	CMD_HW2SW_SRQ 	    = 0x36,
	CMD_QUERY_SRQ       = 0x37,
	CMD_ARM_SRQ         = 0x40,

	/* QP/EE commands */
	CMD_RST2INIT_QPEE   = 0x19,
	CMD_INIT2RTR_QPEE   = 0x1a,
	CMD_RTR2RTS_QPEE    = 0x1b,
	CMD_RTS2RTS_QPEE    = 0x1c,
	CMD_SQERR2RTS_QPEE  = 0x1d,
	CMD_2ERR_QPEE       = 0x1e,
	CMD_RTS2SQD_QPEE    = 0x1f,
	CMD_SQD2SQD_QPEE    = 0x38,
	CMD_SQD2RTS_QPEE    = 0x20,
	CMD_ERR2RST_QPEE    = 0x21,
	CMD_QUERY_QPEE      = 0x22,
	CMD_INIT2INIT_QPEE  = 0x2d,
	CMD_SUSPEND_QPEE    = 0x32,
	CMD_UNSUSPEND_QPEE  = 0x33,
	/* special QPs and management commands */
	CMD_CONF_SPECIAL_QP = 0x23,
	CMD_MAD_IFC         = 0x24,

	/* multicast commands */
	CMD_READ_MGM        = 0x25,
	CMD_WRITE_MGM       = 0x26,
	CMD_MGID_HASH       = 0x27,

	/* miscellaneous commands */
	CMD_DIAG_RPRT       = 0x30,
	CMD_NOP             = 0x31,

	/* debug commands */
	CMD_QUERY_DEBUG_MSG = 0x2a,
	CMD_SET_DEBUG_MSG   = 0x2b,
};

/*
 * According to Mellanox code, FW may be starved and never complete
 * commands.  So we can't use strict timeouts described in PRM -- we
 * just arbitrarily select 60 seconds for now.
 */
#if 0
/*
 * Round up and add 1 to make sure we get the full wait time (since we
 * will be starting in the middle of a jiffy)
 */
enum {
	CMD_TIME_CLASS_A = (HZ + 999) / 1000 + 1,
	CMD_TIME_CLASS_B = (HZ +  99) /  100 + 1,
	CMD_TIME_CLASS_C = (HZ +   9) /   10 + 1,
	CMD_TIME_CLASS_D = 60 * HZ
};
#else
enum {
	CMD_TIME_CLASS_A = 60 * HZ,
	CMD_TIME_CLASS_B = 60 * HZ,
	CMD_TIME_CLASS_C = 60 * HZ,
	CMD_TIME_CLASS_D = 60 * HZ
};
#endif

enum {
	GO_BIT_TIMEOUT = HZ * 10
};

struct mthca_cmd_context {
	struct completion done;
	int               result;
	int               next;
	u64               out_param;
	u16               token;
	u8                status;
};

static int fw_cmd_doorbell = 0;
module_param(fw_cmd_doorbell, int, 0644);
MODULE_PARM_DESC(fw_cmd_doorbell, "post FW commands through doorbell page if nonzero "
		 "(and supported by FW)");

static inline int go_bit(struct mthca_dev *dev)
{
	return readl(dev->hcr + HCR_STATUS_OFFSET) &
		swab32(1 << HCR_GO_BIT);
}

static void mthca_cmd_post_dbell(struct mthca_dev *dev,
				 u64 in_param,
				 u64 out_param,
				 u32 in_modifier,
				 u8 op_modifier,
				 u16 op,
				 u16 token)
{
	void __iomem *ptr = dev->cmd.dbell_map;
	u16 *offs = dev->cmd.dbell_offsets;

	__raw_writel((__force u32) cpu_to_be32(in_param >> 32),           ptr + offs[0]);
	wmb();
	__raw_writel((__force u32) cpu_to_be32(in_param & 0xfffffffful),  ptr + offs[1]);
	wmb();
	__raw_writel((__force u32) cpu_to_be32(in_modifier),              ptr + offs[2]);
	wmb();
	__raw_writel((__force u32) cpu_to_be32(out_param >> 32),          ptr + offs[3]);
	wmb();
	__raw_writel((__force u32) cpu_to_be32(out_param & 0xfffffffful), ptr + offs[4]);
	wmb();
	__raw_writel((__force u32) cpu_to_be32(token << 16),              ptr + offs[5]);
	wmb();
	__raw_writel((__force u32) cpu_to_be32((1 << HCR_GO_BIT)                |
					       (1 << HCA_E_BIT)                 |
					       (op_modifier << HCR_OPMOD_SHIFT) |
						op),			  ptr + offs[6]);
	wmb();
	__raw_writel((__force u32) 0,                                     ptr + offs[7]);
	wmb();
}

static int mthca_cmd_post_hcr(struct mthca_dev *dev,
			      u64 in_param,
			      u64 out_param,
			      u32 in_modifier,
			      u8 op_modifier,
			      u16 op,
			      u16 token,
			      int event)
{
	if (event) {
		unsigned long end = jiffies + GO_BIT_TIMEOUT;

		while (go_bit(dev) && time_before(jiffies, end)) {
			set_current_state(TASK_RUNNING);
			schedule();
		}
	}

	if (go_bit(dev))
		return -EAGAIN;

	/*
	 * We use writel (instead of something like memcpy_toio)
	 * because writes of less than 32 bits to the HCR don't work
	 * (and some architectures such as ia64 implement memcpy_toio
	 * in terms of writeb).
	 */
	__raw_writel((__force u32) cpu_to_be32(in_param >> 32),           dev->hcr + 0 * 4);
	__raw_writel((__force u32) cpu_to_be32(in_param & 0xfffffffful),  dev->hcr + 1 * 4);
	__raw_writel((__force u32) cpu_to_be32(in_modifier),              dev->hcr + 2 * 4);
	__raw_writel((__force u32) cpu_to_be32(out_param >> 32),          dev->hcr + 3 * 4);
	__raw_writel((__force u32) cpu_to_be32(out_param & 0xfffffffful), dev->hcr + 4 * 4);
	__raw_writel((__force u32) cpu_to_be32(token << 16),              dev->hcr + 5 * 4);

	/* __raw_writel may not order writes. */
	wmb();

	__raw_writel((__force u32) cpu_to_be32((1 << HCR_GO_BIT)                |
					       (event ? (1 << HCA_E_BIT) : 0)   |
					       (op_modifier << HCR_OPMOD_SHIFT) |
					       op),                       dev->hcr + 6 * 4);

	return 0;
}

static int mthca_cmd_post(struct mthca_dev *dev,
			  u64 in_param,
			  u64 out_param,
			  u32 in_modifier,
			  u8 op_modifier,
			  u16 op,
			  u16 token,
			  int event)
{
	int err = 0;

	mutex_lock(&dev->cmd.hcr_mutex);

	if (event && dev->cmd.flags & MTHCA_CMD_POST_DOORBELLS && fw_cmd_doorbell)
		mthca_cmd_post_dbell(dev, in_param, out_param, in_modifier,
					   op_modifier, op, token);
	else
		err = mthca_cmd_post_hcr(dev, in_param, out_param, in_modifier,
					 op_modifier, op, token, event);

	/*
	 * Make sure that our HCR writes don't get mixed in with
	 * writes from another CPU starting a FW command.
	 */
	mmiowb();

	mutex_unlock(&dev->cmd.hcr_mutex);
	return err;
}


static int mthca_status_to_errno(u8 status)
{
	static const int trans_table[] = {
		[MTHCA_CMD_STAT_INTERNAL_ERR]   = -EIO,
		[MTHCA_CMD_STAT_BAD_OP]         = -EPERM,
		[MTHCA_CMD_STAT_BAD_PARAM]      = -EINVAL,
		[MTHCA_CMD_STAT_BAD_SYS_STATE]  = -ENXIO,
		[MTHCA_CMD_STAT_BAD_RESOURCE]   = -EBADF,
		[MTHCA_CMD_STAT_RESOURCE_BUSY]  = -EBUSY,
		[MTHCA_CMD_STAT_DDR_MEM_ERR]    = -ENOMEM,
		[MTHCA_CMD_STAT_EXCEED_LIM]     = -ENOMEM,
		[MTHCA_CMD_STAT_BAD_RES_STATE]  = -EBADF,
		[MTHCA_CMD_STAT_BAD_INDEX]      = -EBADF,
		[MTHCA_CMD_STAT_BAD_NVMEM]      = -EFAULT,
		[MTHCA_CMD_STAT_BAD_QPEE_STATE] = -EINVAL,
		[MTHCA_CMD_STAT_BAD_SEG_PARAM]  = -EFAULT,
		[MTHCA_CMD_STAT_REG_BOUND]      = -EBUSY,
		[MTHCA_CMD_STAT_LAM_NOT_PRE]    = -EAGAIN,
		[MTHCA_CMD_STAT_BAD_PKT]        = -EBADMSG,
		[MTHCA_CMD_STAT_BAD_SIZE]       = -ENOMEM,
	};

	if (status >= ARRAY_SIZE(trans_table) ||
			(status != MTHCA_CMD_STAT_OK
			 && trans_table[status] == 0))
		return -EINVAL;

	return trans_table[status];
}


static int mthca_cmd_poll(struct mthca_dev *dev,
			  u64 in_param,
			  u64 *out_param,
			  int out_is_imm,
			  u32 in_modifier,
			  u8 op_modifier,
			  u16 op,
			  unsigned long timeout)
{
	int err = 0;
	unsigned long end;
	u8 status;

	down(&dev->cmd.poll_sem);

	err = mthca_cmd_post(dev, in_param,
			     out_param ? *out_param : 0,
			     in_modifier, op_modifier,
			     op, CMD_POLL_TOKEN, 0);
	if (err)
		goto out;

	end = timeout + jiffies;
	while (go_bit(dev) && time_before(jiffies, end)) {
		set_current_state(TASK_RUNNING);
		schedule();
	}

	if (go_bit(dev)) {
		err = -EBUSY;
		goto out;
	}

	if (out_is_imm)
		*out_param =
			(u64) be32_to_cpu((__force __be32)
					  __raw_readl(dev->hcr + HCR_OUT_PARAM_OFFSET)) << 32 |
			(u64) be32_to_cpu((__force __be32)
					  __raw_readl(dev->hcr + HCR_OUT_PARAM_OFFSET + 4));

	status = be32_to_cpu((__force __be32) __raw_readl(dev->hcr + HCR_STATUS_OFFSET)) >> 24;
	if (status) {
		mthca_dbg(dev, "Command %02x completed with status %02x\n",
			  op, status);
		err = mthca_status_to_errno(status);
	}

out:
	up(&dev->cmd.poll_sem);
	return err;
}

void mthca_cmd_event(struct mthca_dev *dev,
		     u16 token,
		     u8  status,
		     u64 out_param)
{
	struct mthca_cmd_context *context =
		&dev->cmd.context[token & dev->cmd.token_mask];

	/* previously timed out command completing at long last */
	if (token != context->token)
		return;

	context->result    = 0;
	context->status    = status;
	context->out_param = out_param;

	complete(&context->done);
}

static int mthca_cmd_wait(struct mthca_dev *dev,
			  u64 in_param,
			  u64 *out_param,
			  int out_is_imm,
			  u32 in_modifier,
			  u8 op_modifier,
			  u16 op,
			  unsigned long timeout)
{
	int err = 0;
	struct mthca_cmd_context *context;

	down(&dev->cmd.event_sem);

	spin_lock(&dev->cmd.context_lock);
	BUG_ON(dev->cmd.free_head < 0);
	context = &dev->cmd.context[dev->cmd.free_head];
	context->token += dev->cmd.token_mask + 1;
	dev->cmd.free_head = context->next;
	spin_unlock(&dev->cmd.context_lock);

	init_completion(&context->done);

	err = mthca_cmd_post(dev, in_param,
			     out_param ? *out_param : 0,
			     in_modifier, op_modifier,
			     op, context->token, 1);
	if (err)
		goto out;

	if (!wait_for_completion_timeout(&context->done, timeout)) {
		err = -EBUSY;
		goto out;
	}

	err = context->result;
	if (err)
		goto out;

	if (context->status) {
		mthca_dbg(dev, "Command %02x completed with status %02x\n",
			  op, context->status);
		err = mthca_status_to_errno(context->status);
	}

	if (out_is_imm)
		*out_param = context->out_param;

out:
	spin_lock(&dev->cmd.context_lock);
	context->next = dev->cmd.free_head;
	dev->cmd.free_head = context - dev->cmd.context;
	spin_unlock(&dev->cmd.context_lock);

	up(&dev->cmd.event_sem);
	return err;
}

/* Invoke a command with an output mailbox */
static int mthca_cmd_box(struct mthca_dev *dev,
			 u64 in_param,
			 u64 out_param,
			 u32 in_modifier,
			 u8 op_modifier,
			 u16 op,
			 unsigned long timeout)
{
	if (dev->cmd.flags & MTHCA_CMD_USE_EVENTS)
		return mthca_cmd_wait(dev, in_param, &out_param, 0,
				      in_modifier, op_modifier, op,
				      timeout);
	else
		return mthca_cmd_poll(dev, in_param, &out_param, 0,
				      in_modifier, op_modifier, op,
				      timeout);
}

/* Invoke a command with no output parameter */
static int mthca_cmd(struct mthca_dev *dev,
		     u64 in_param,
		     u32 in_modifier,
		     u8 op_modifier,
		     u16 op,
		     unsigned long timeout)
{
	return mthca_cmd_box(dev, in_param, 0, in_modifier,
			     op_modifier, op, timeout);
}

/*
 * Invoke a command with an immediate output parameter (and copy the
 * output into the caller's out_param pointer after the command
 * executes).
 */
static int mthca_cmd_imm(struct mthca_dev *dev,
			 u64 in_param,
			 u64 *out_param,
			 u32 in_modifier,
			 u8 op_modifier,
			 u16 op,
			 unsigned long timeout)
{
	if (dev->cmd.flags & MTHCA_CMD_USE_EVENTS)
		return mthca_cmd_wait(dev, in_param, out_param, 1,
				      in_modifier, op_modifier, op,
				      timeout);
	else
		return mthca_cmd_poll(dev, in_param, out_param, 1,
				      in_modifier, op_modifier, op,
				      timeout);
}

int mthca_cmd_init(struct mthca_dev *dev)
{
	mutex_init(&dev->cmd.hcr_mutex);
	sema_init(&dev->cmd.poll_sem, 1);
	dev->cmd.flags = 0;

	dev->hcr = ioremap(pci_resource_start(dev->pdev, 0) + MTHCA_HCR_BASE,
			   MTHCA_HCR_SIZE);
	if (!dev->hcr) {
		mthca_err(dev, "Couldn't map command register.");
		return -ENOMEM;
	}

	dev->cmd.pool = pci_pool_create("mthca_cmd", dev->pdev,
					MTHCA_MAILBOX_SIZE,
					MTHCA_MAILBOX_SIZE, 0);
	if (!dev->cmd.pool) {
		iounmap(dev->hcr);
		return -ENOMEM;
	}

	return 0;
}

void mthca_cmd_cleanup(struct mthca_dev *dev)
{
	pci_pool_destroy(dev->cmd.pool);
	iounmap(dev->hcr);
	if (dev->cmd.flags & MTHCA_CMD_POST_DOORBELLS)
		iounmap(dev->cmd.dbell_map);
}

/*
 * Switch to using events to issue FW commands (should be called after
 * event queue to command events has been initialized).
 */
int mthca_cmd_use_events(struct mthca_dev *dev)
{
	int i;

	dev->cmd.context = kmalloc(dev->cmd.max_cmds *
				   sizeof (struct mthca_cmd_context),
				   GFP_KERNEL);
	if (!dev->cmd.context)
		return -ENOMEM;

	for (i = 0; i < dev->cmd.max_cmds; ++i) {
		dev->cmd.context[i].token = i;
		dev->cmd.context[i].next = i + 1;
	}

	dev->cmd.context[dev->cmd.max_cmds - 1].next = -1;
	dev->cmd.free_head = 0;

	sema_init(&dev->cmd.event_sem, dev->cmd.max_cmds);
	spin_lock_init(&dev->cmd.context_lock);

	for (dev->cmd.token_mask = 1;
	     dev->cmd.token_mask < dev->cmd.max_cmds;
	     dev->cmd.token_mask <<= 1)
		; /* nothing */
	--dev->cmd.token_mask;

	dev->cmd.flags |= MTHCA_CMD_USE_EVENTS;

	down(&dev->cmd.poll_sem);

	return 0;
}

/*
 * Switch back to polling (used when shutting down the device)
 */
void mthca_cmd_use_polling(struct mthca_dev *dev)
{
	int i;

	dev->cmd.flags &= ~MTHCA_CMD_USE_EVENTS;

	for (i = 0; i < dev->cmd.max_cmds; ++i)
		down(&dev->cmd.event_sem);

	kfree(dev->cmd.context);

	up(&dev->cmd.poll_sem);
}

struct mthca_mailbox *mthca_alloc_mailbox(struct mthca_dev *dev,
					  gfp_t gfp_mask)
{
	struct mthca_mailbox *mailbox;

	mailbox = kmalloc(sizeof *mailbox, gfp_mask);
	if (!mailbox)
		return ERR_PTR(-ENOMEM);

	mailbox->buf = pci_pool_alloc(dev->cmd.pool, gfp_mask, &mailbox->dma);
	if (!mailbox->buf) {
		kfree(mailbox);
		return ERR_PTR(-ENOMEM);
	}

	return mailbox;
}

void mthca_free_mailbox(struct mthca_dev *dev, struct mthca_mailbox *mailbox)
{
	if (!mailbox)
		return;

	pci_pool_free(dev->cmd.pool, mailbox->buf, mailbox->dma);
	kfree(mailbox);
}

int mthca_SYS_EN(struct mthca_dev *dev)
{
	u64 out;
	int ret;

	ret = mthca_cmd_imm(dev, 0, &out, 0, 0, CMD_SYS_EN, CMD_TIME_CLASS_D);

	if (ret == -ENOMEM)
		mthca_warn(dev, "SYS_EN DDR error: syn=%x, sock=%d, "
			   "sladdr=%d, SPD source=%s\n",
			   (int) (out >> 6) & 0xf, (int) (out >> 4) & 3,
			   (int) (out >> 1) & 7, (int) out & 1 ? "NVMEM" : "DIMM");

	return ret;
}

int mthca_SYS_DIS(struct mthca_dev *dev)
{
	return mthca_cmd(dev, 0, 0, 0, CMD_SYS_DIS, CMD_TIME_CLASS_C);
}

static int mthca_map_cmd(struct mthca_dev *dev, u16 op, struct mthca_icm *icm,
			 u64 virt)
{
	struct mthca_mailbox *mailbox;
	struct mthca_icm_iter iter;
	__be64 *pages;
	int lg;
	int nent = 0;
	int i;
	int err = 0;
	int ts = 0, tc = 0;

	mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);
	memset(mailbox->buf, 0, MTHCA_MAILBOX_SIZE);
	pages = mailbox->buf;

	for (mthca_icm_first(icm, &iter);
	     !mthca_icm_last(&iter);
	     mthca_icm_next(&iter)) {
		/*
		 * We have to pass pages that are aligned to their
		 * size, so find the least significant 1 in the
		 * address or size and use that as our log2 size.
		 */
		lg = ffs(mthca_icm_addr(&iter) | mthca_icm_size(&iter)) - 1;
		if (lg < MTHCA_ICM_PAGE_SHIFT) {
			mthca_warn(dev, "Got FW area not aligned to %d (%llx/%lx).\n",
				   MTHCA_ICM_PAGE_SIZE,
				   (unsigned long long) mthca_icm_addr(&iter),
				   mthca_icm_size(&iter));
			err = -EINVAL;
			goto out;
		}
		for (i = 0; i < mthca_icm_size(&iter) >> lg; ++i) {
			if (virt != -1) {
				pages[nent * 2] = cpu_to_be64(virt);
				virt += 1 << lg;
			}

			pages[nent * 2 + 1] =
				cpu_to_be64((mthca_icm_addr(&iter) + (i << lg)) |
					    (lg - MTHCA_ICM_PAGE_SHIFT));
			ts += 1 << (lg - 10);
			++tc;

			if (++nent == MTHCA_MAILBOX_SIZE / 16) {
				err = mthca_cmd(dev, mailbox->dma, nent, 0, op,
						CMD_TIME_CLASS_B);
				if (err)
					goto out;
				nent = 0;
			}
		}
	}

	if (nent)
		err = mthca_cmd(dev, mailbox->dma, nent, 0, op,
				CMD_TIME_CLASS_B);

	switch (op) {
	case CMD_MAP_FA:
		mthca_dbg(dev, "Mapped %d chunks/%d KB for FW.\n", tc, ts);
		break;
	case CMD_MAP_ICM_AUX:
		mthca_dbg(dev, "Mapped %d chunks/%d KB for ICM aux.\n", tc, ts);
		break;
	case CMD_MAP_ICM:
		mthca_dbg(dev, "Mapped %d chunks/%d KB at %llx for ICM.\n",
			  tc, ts, (unsigned long long) virt - (ts << 10));
		break;
	}

out:
	mthca_free_mailbox(dev, mailbox);
	return err;
}

int mthca_MAP_FA(struct mthca_dev *dev, struct mthca_icm *icm)
{
	return mthca_map_cmd(dev, CMD_MAP_FA, icm, -1);
}

int mthca_UNMAP_FA(struct mthca_dev *dev)
{
	return mthca_cmd(dev, 0, 0, 0, CMD_UNMAP_FA, CMD_TIME_CLASS_B);
}

int mthca_RUN_FW(struct mthca_dev *dev)
{
	return mthca_cmd(dev, 0, 0, 0, CMD_RUN_FW, CMD_TIME_CLASS_A);
}

static void mthca_setup_cmd_doorbells(struct mthca_dev *dev, u64 base)
{
	phys_addr_t addr;
	u16 max_off = 0;
	int i;

	for (i = 0; i < 8; ++i)
		max_off = max(max_off, dev->cmd.dbell_offsets[i]);

	if ((base & PAGE_MASK) != ((base + max_off) & PAGE_MASK)) {
		mthca_warn(dev, "Firmware doorbell region at 0x%016llx, "
			   "length 0x%x crosses a page boundary\n",
			   (unsigned long long) base, max_off);
		return;
	}

	addr = pci_resource_start(dev->pdev, 2) +
		((pci_resource_len(dev->pdev, 2) - 1) & base);
	dev->cmd.dbell_map = ioremap(addr, max_off + sizeof(u32));
	if (!dev->cmd.dbell_map)
		return;

	dev->cmd.flags |= MTHCA_CMD_POST_DOORBELLS;
	mthca_dbg(dev, "Mapped doorbell page for posting FW commands\n");
}

int mthca_QUERY_FW(struct mthca_dev *dev)
{
	struct mthca_mailbox *mailbox;
	u32 *outbox;
	u64 base;
	u32 tmp;
	int err = 0;
	u8 lg;
	int i;

#define QUERY_FW_OUT_SIZE             0x100
#define QUERY_FW_VER_OFFSET            0x00
#define QUERY_FW_MAX_CMD_OFFSET        0x0f
#define QUERY_FW_ERR_START_OFFSET      0x30
#define QUERY_FW_ERR_SIZE_OFFSET       0x38

#define QUERY_FW_CMD_DB_EN_OFFSET      0x10
#define QUERY_FW_CMD_DB_OFFSET         0x50
#define QUERY_FW_CMD_DB_BASE           0x60

#define QUERY_FW_START_OFFSET          0x20
#define QUERY_FW_END_OFFSET            0x28

#define QUERY_FW_SIZE_OFFSET           0x00
#define QUERY_FW_CLR_INT_BASE_OFFSET   0x20
#define QUERY_FW_EQ_ARM_BASE_OFFSET    0x40
#define QUERY_FW_EQ_SET_CI_BASE_OFFSET 0x48

	mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);
	outbox = mailbox->buf;

	err = mthca_cmd_box(dev, 0, mailbox->dma, 0, 0, CMD_QUERY_FW,
			    CMD_TIME_CLASS_A);

	if (err)
		goto out;

	MTHCA_GET(dev->fw_ver,   outbox, QUERY_FW_VER_OFFSET);
	/*
	 * FW subminor version is at more significant bits than minor
	 * version, so swap here.
	 */
	dev->fw_ver = (dev->fw_ver & 0xffff00000000ull) |
		((dev->fw_ver & 0xffff0000ull) >> 16) |
		((dev->fw_ver & 0x0000ffffull) << 16);

	MTHCA_GET(lg, outbox, QUERY_FW_MAX_CMD_OFFSET);
	dev->cmd.max_cmds = 1 << lg;

	mthca_dbg(dev, "FW version %012llx, max commands %d\n",
		  (unsigned long long) dev->fw_ver, dev->cmd.max_cmds);

	MTHCA_GET(dev->catas_err.addr, outbox, QUERY_FW_ERR_START_OFFSET);
	MTHCA_GET(dev->catas_err.size, outbox, QUERY_FW_ERR_SIZE_OFFSET);

	mthca_dbg(dev, "Catastrophic error buffer at 0x%llx, size 0x%x\n",
		  (unsigned long long) dev->catas_err.addr, dev->catas_err.size);

	MTHCA_GET(tmp, outbox, QUERY_FW_CMD_DB_EN_OFFSET);
	if (tmp & 0x1) {
		mthca_dbg(dev, "FW supports commands through doorbells\n");

		MTHCA_GET(base, outbox, QUERY_FW_CMD_DB_BASE);
		for (i = 0; i < MTHCA_CMD_NUM_DBELL_DWORDS; ++i)
			MTHCA_GET(dev->cmd.dbell_offsets[i], outbox,
				  QUERY_FW_CMD_DB_OFFSET + (i << 1));

		mthca_setup_cmd_doorbells(dev, base);
	}

	if (mthca_is_memfree(dev)) {
		MTHCA_GET(dev->fw.arbel.fw_pages,       outbox, QUERY_FW_SIZE_OFFSET);
		MTHCA_GET(dev->fw.arbel.clr_int_base,   outbox, QUERY_FW_CLR_INT_BASE_OFFSET);
		MTHCA_GET(dev->fw.arbel.eq_arm_base,    outbox, QUERY_FW_EQ_ARM_BASE_OFFSET);
		MTHCA_GET(dev->fw.arbel.eq_set_ci_base, outbox, QUERY_FW_EQ_SET_CI_BASE_OFFSET);
		mthca_dbg(dev, "FW size %d KB\n", dev->fw.arbel.fw_pages << 2);

		/*
		 * Round up number of system pages needed in case
		 * MTHCA_ICM_PAGE_SIZE < PAGE_SIZE.
		 */
		dev->fw.arbel.fw_pages =
			ALIGN(dev->fw.arbel.fw_pages, PAGE_SIZE / MTHCA_ICM_PAGE_SIZE) >>
				(PAGE_SHIFT - MTHCA_ICM_PAGE_SHIFT);

		mthca_dbg(dev, "Clear int @ %llx, EQ arm @ %llx, EQ set CI @ %llx\n",
			  (unsigned long long) dev->fw.arbel.clr_int_base,
			  (unsigned long long) dev->fw.arbel.eq_arm_base,
			  (unsigned long long) dev->fw.arbel.eq_set_ci_base);
	} else {
		MTHCA_GET(dev->fw.tavor.fw_start, outbox, QUERY_FW_START_OFFSET);
		MTHCA_GET(dev->fw.tavor.fw_end,   outbox, QUERY_FW_END_OFFSET);

		mthca_dbg(dev, "FW size %d KB (start %llx, end %llx)\n",
			  (int) ((dev->fw.tavor.fw_end - dev->fw.tavor.fw_start) >> 10),
			  (unsigned long long) dev->fw.tavor.fw_start,
			  (unsigned long long) dev->fw.tavor.fw_end);
	}

out:
	mthca_free_mailbox(dev, mailbox);
	return err;
}

int mthca_ENABLE_LAM(struct mthca_dev *dev)
{
	struct mthca_mailbox *mailbox;
	u8 info;
	u32 *outbox;
	int err = 0;

#define ENABLE_LAM_OUT_SIZE         0x100
#define ENABLE_LAM_START_OFFSET     0x00
#define ENABLE_LAM_END_OFFSET       0x08
#define ENABLE_LAM_INFO_OFFSET      0x13

#define ENABLE_LAM_INFO_HIDDEN_FLAG (1 << 4)
#define ENABLE_LAM_INFO_ECC_MASK    0x3

	mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);
	outbox = mailbox->buf;

	err = mthca_cmd_box(dev, 0, mailbox->dma, 0, 0, CMD_ENABLE_LAM,
			    CMD_TIME_CLASS_C);

	if (err)
		goto out;

	MTHCA_GET(dev->ddr_start, outbox, ENABLE_LAM_START_OFFSET);
	MTHCA_GET(dev->ddr_end,   outbox, ENABLE_LAM_END_OFFSET);
	MTHCA_GET(info,           outbox, ENABLE_LAM_INFO_OFFSET);

	if (!!(info & ENABLE_LAM_INFO_HIDDEN_FLAG) !=
	    !!(dev->mthca_flags & MTHCA_FLAG_DDR_HIDDEN)) {
		mthca_info(dev, "FW reports that HCA-attached memory "
			   "is %s hidden; does not match PCI config\n",
			   (info & ENABLE_LAM_INFO_HIDDEN_FLAG) ?
			   "" : "not");
	}
	if (info & ENABLE_LAM_INFO_HIDDEN_FLAG)
		mthca_dbg(dev, "HCA-attached memory is hidden.\n");

	mthca_dbg(dev, "HCA memory size %d KB (start %llx, end %llx)\n",
		  (int) ((dev->ddr_end - dev->ddr_start) >> 10),
		  (unsigned long long) dev->ddr_start,
		  (unsigned long long) dev->ddr_end);

out:
	mthca_free_mailbox(dev, mailbox);
	return err;
}

int mthca_DISABLE_LAM(struct mthca_dev *dev)
{
	return mthca_cmd(dev, 0, 0, 0, CMD_SYS_DIS, CMD_TIME_CLASS_C);
}

int mthca_QUERY_DDR(struct mthca_dev *dev)
{
	struct mthca_mailbox *mailbox;
	u8 info;
	u32 *outbox;
	int err = 0;

#define QUERY_DDR_OUT_SIZE         0x100
#define QUERY_DDR_START_OFFSET     0x00
#define QUERY_DDR_END_OFFSET       0x08
#define QUERY_DDR_INFO_OFFSET      0x13

#define QUERY_DDR_INFO_HIDDEN_FLAG (1 << 4)
#define QUERY_DDR_INFO_ECC_MASK    0x3

	mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);
	outbox = mailbox->buf;

	err = mthca_cmd_box(dev, 0, mailbox->dma, 0, 0, CMD_QUERY_DDR,
			    CMD_TIME_CLASS_A);

	if (err)
		goto out;

	MTHCA_GET(dev->ddr_start, outbox, QUERY_DDR_START_OFFSET);
	MTHCA_GET(dev->ddr_end,   outbox, QUERY_DDR_END_OFFSET);
	MTHCA_GET(info,           outbox, QUERY_DDR_INFO_OFFSET);

	if (!!(info & QUERY_DDR_INFO_HIDDEN_FLAG) !=
	    !!(dev->mthca_flags & MTHCA_FLAG_DDR_HIDDEN)) {
		mthca_info(dev, "FW reports that HCA-attached memory "
			   "is %s hidden; does not match PCI config\n",
			   (info & QUERY_DDR_INFO_HIDDEN_FLAG) ?
			   "" : "not");
	}
	if (info & QUERY_DDR_INFO_HIDDEN_FLAG)
		mthca_dbg(dev, "HCA-attached memory is hidden.\n");

	mthca_dbg(dev, "HCA memory size %d KB (start %llx, end %llx)\n",
		  (int) ((dev->ddr_end - dev->ddr_start) >> 10),
		  (unsigned long long) dev->ddr_start,
		  (unsigned long long) dev->ddr_end);

out:
	mthca_free_mailbox(dev, mailbox);
	return err;
}

int mthca_QUERY_DEV_LIM(struct mthca_dev *dev,
			struct mthca_dev_lim *dev_lim)
{
	struct mthca_mailbox *mailbox;
	u32 *outbox;
	u8 field;
	u16 size;
	u16 stat_rate;
	int err;

#define QUERY_DEV_LIM_OUT_SIZE             0x100
#define QUERY_DEV_LIM_MAX_SRQ_SZ_OFFSET     0x10
#define QUERY_DEV_LIM_MAX_QP_SZ_OFFSET      0x11
#define QUERY_DEV_LIM_RSVD_QP_OFFSET        0x12
#define QUERY_DEV_LIM_MAX_QP_OFFSET         0x13
#define QUERY_DEV_LIM_RSVD_SRQ_OFFSET       0x14
#define QUERY_DEV_LIM_MAX_SRQ_OFFSET        0x15
#define QUERY_DEV_LIM_RSVD_EEC_OFFSET       0x16
#define QUERY_DEV_LIM_MAX_EEC_OFFSET        0x17
#define QUERY_DEV_LIM_MAX_CQ_SZ_OFFSET      0x19
#define QUERY_DEV_LIM_RSVD_CQ_OFFSET        0x1a
#define QUERY_DEV_LIM_MAX_CQ_OFFSET         0x1b
#define QUERY_DEV_LIM_MAX_MPT_OFFSET        0x1d
#define QUERY_DEV_LIM_RSVD_EQ_OFFSET        0x1e
#define QUERY_DEV_LIM_MAX_EQ_OFFSET         0x1f
#define QUERY_DEV_LIM_RSVD_MTT_OFFSET       0x20
#define QUERY_DEV_LIM_MAX_MRW_SZ_OFFSET     0x21
#define QUERY_DEV_LIM_RSVD_MRW_OFFSET       0x22
#define QUERY_DEV_LIM_MAX_MTT_SEG_OFFSET    0x23
#define QUERY_DEV_LIM_MAX_AV_OFFSET         0x27
#define QUERY_DEV_LIM_MAX_REQ_QP_OFFSET     0x29
#define QUERY_DEV_LIM_MAX_RES_QP_OFFSET     0x2b
#define QUERY_DEV_LIM_MAX_RDMA_OFFSET       0x2f
#define QUERY_DEV_LIM_RSZ_SRQ_OFFSET        0x33
#define QUERY_DEV_LIM_ACK_DELAY_OFFSET      0x35
#define QUERY_DEV_LIM_MTU_WIDTH_OFFSET      0x36
#define QUERY_DEV_LIM_VL_PORT_OFFSET        0x37
#define QUERY_DEV_LIM_MAX_GID_OFFSET        0x3b
#define QUERY_DEV_LIM_RATE_SUPPORT_OFFSET   0x3c
#define QUERY_DEV_LIM_MAX_PKEY_OFFSET       0x3f
#define QUERY_DEV_LIM_FLAGS_OFFSET          0x44
#define QUERY_DEV_LIM_RSVD_UAR_OFFSET       0x48
#define QUERY_DEV_LIM_UAR_SZ_OFFSET         0x49
#define QUERY_DEV_LIM_PAGE_SZ_OFFSET        0x4b
#define QUERY_DEV_LIM_MAX_SG_OFFSET         0x51
#define QUERY_DEV_LIM_MAX_DESC_SZ_OFFSET    0x52
#define QUERY_DEV_LIM_MAX_SG_RQ_OFFSET      0x55
#define QUERY_DEV_LIM_MAX_DESC_SZ_RQ_OFFSET 0x56
#define QUERY_DEV_LIM_MAX_QP_MCG_OFFSET     0x61
#define QUERY_DEV_LIM_RSVD_MCG_OFFSET       0x62
#define QUERY_DEV_LIM_MAX_MCG_OFFSET        0x63
#define QUERY_DEV_LIM_RSVD_PD_OFFSET        0x64
#define QUERY_DEV_LIM_MAX_PD_OFFSET         0x65
#define QUERY_DEV_LIM_RSVD_RDD_OFFSET       0x66
#define QUERY_DEV_LIM_MAX_RDD_OFFSET        0x67
#define QUERY_DEV_LIM_EEC_ENTRY_SZ_OFFSET   0x80
#define QUERY_DEV_LIM_QPC_ENTRY_SZ_OFFSET   0x82
#define QUERY_DEV_LIM_EEEC_ENTRY_SZ_OFFSET  0x84
#define QUERY_DEV_LIM_EQPC_ENTRY_SZ_OFFSET  0x86
#define QUERY_DEV_LIM_EQC_ENTRY_SZ_OFFSET   0x88
#define QUERY_DEV_LIM_CQC_ENTRY_SZ_OFFSET   0x8a
#define QUERY_DEV_LIM_SRQ_ENTRY_SZ_OFFSET   0x8c
#define QUERY_DEV_LIM_UAR_ENTRY_SZ_OFFSET   0x8e
#define QUERY_DEV_LIM_MTT_ENTRY_SZ_OFFSET   0x90
#define QUERY_DEV_LIM_MPT_ENTRY_SZ_OFFSET   0x92
#define QUERY_DEV_LIM_PBL_SZ_OFFSET         0x96
#define QUERY_DEV_LIM_BMME_FLAGS_OFFSET     0x97
#define QUERY_DEV_LIM_RSVD_LKEY_OFFSET      0x98
#define QUERY_DEV_LIM_LAMR_OFFSET           0x9f
#define QUERY_DEV_LIM_MAX_ICM_SZ_OFFSET     0xa0

	mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);
	outbox = mailbox->buf;

	err = mthca_cmd_box(dev, 0, mailbox->dma, 0, 0, CMD_QUERY_DEV_LIM,
			    CMD_TIME_CLASS_A);

	if (err)
		goto out;

	MTHCA_GET(field, outbox, QUERY_DEV_LIM_RSVD_QP_OFFSET);
	dev_lim->reserved_qps = 1 << (field & 0xf);
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_MAX_QP_OFFSET);
	dev_lim->max_qps = 1 << (field & 0x1f);
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_RSVD_SRQ_OFFSET);
	dev_lim->reserved_srqs = 1 << (field >> 4);
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_MAX_SRQ_OFFSET);
	dev_lim->max_srqs = 1 << (field & 0x1f);
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_RSVD_EEC_OFFSET);
	dev_lim->reserved_eecs = 1 << (field & 0xf);
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_MAX_EEC_OFFSET);
	dev_lim->max_eecs = 1 << (field & 0x1f);
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_MAX_CQ_SZ_OFFSET);
	dev_lim->max_cq_sz = 1 << field;
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_RSVD_CQ_OFFSET);
	dev_lim->reserved_cqs = 1 << (field & 0xf);
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_MAX_CQ_OFFSET);
	dev_lim->max_cqs = 1 << (field & 0x1f);
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_MAX_MPT_OFFSET);
	dev_lim->max_mpts = 1 << (field & 0x3f);
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_RSVD_EQ_OFFSET);
	dev_lim->reserved_eqs = 1 << (field & 0xf);
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_MAX_EQ_OFFSET);
	dev_lim->max_eqs = 1 << (field & 0x7);
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_RSVD_MTT_OFFSET);
	if (mthca_is_memfree(dev))
		dev_lim->reserved_mtts = ALIGN((1 << (field >> 4)) * sizeof(u64),
					       dev->limits.mtt_seg_size) / dev->limits.mtt_seg_size;
	else
		dev_lim->reserved_mtts = 1 << (field >> 4);
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_MAX_MRW_SZ_OFFSET);
	dev_lim->max_mrw_sz = 1 << field;
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_RSVD_MRW_OFFSET);
	dev_lim->reserved_mrws = 1 << (field & 0xf);
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_MAX_MTT_SEG_OFFSET);
	dev_lim->max_mtt_seg = 1 << (field & 0x3f);
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_MAX_REQ_QP_OFFSET);
	dev_lim->max_requester_per_qp = 1 << (field & 0x3f);
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_MAX_RES_QP_OFFSET);
	dev_lim->max_responder_per_qp = 1 << (field & 0x3f);
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_MAX_RDMA_OFFSET);
	dev_lim->max_rdma_global = 1 << (field & 0x3f);
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_ACK_DELAY_OFFSET);
	dev_lim->local_ca_ack_delay = field & 0x1f;
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_MTU_WIDTH_OFFSET);
	dev_lim->max_mtu        = field >> 4;
	dev_lim->max_port_width = field & 0xf;
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_VL_PORT_OFFSET);
	dev_lim->max_vl    = field >> 4;
	dev_lim->num_ports = field & 0xf;
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_MAX_GID_OFFSET);
	dev_lim->max_gids = 1 << (field & 0xf);
	MTHCA_GET(stat_rate, outbox, QUERY_DEV_LIM_RATE_SUPPORT_OFFSET);
	dev_lim->stat_rate_support = stat_rate;
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_MAX_PKEY_OFFSET);
	dev_lim->max_pkeys = 1 << (field & 0xf);
	MTHCA_GET(dev_lim->flags, outbox, QUERY_DEV_LIM_FLAGS_OFFSET);
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_RSVD_UAR_OFFSET);
	dev_lim->reserved_uars = field >> 4;
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_UAR_SZ_OFFSET);
	dev_lim->uar_size = 1 << ((field & 0x3f) + 20);
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_PAGE_SZ_OFFSET);
	dev_lim->min_page_sz = 1 << field;
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_MAX_SG_OFFSET);
	dev_lim->max_sg = field;

	MTHCA_GET(size, outbox, QUERY_DEV_LIM_MAX_DESC_SZ_OFFSET);
	dev_lim->max_desc_sz = size;

	MTHCA_GET(field, outbox, QUERY_DEV_LIM_MAX_QP_MCG_OFFSET);
	dev_lim->max_qp_per_mcg = 1 << field;
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_RSVD_MCG_OFFSET);
	dev_lim->reserved_mgms = field & 0xf;
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_MAX_MCG_OFFSET);
	dev_lim->max_mcgs = 1 << field;
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_RSVD_PD_OFFSET);
	dev_lim->reserved_pds = field >> 4;
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_MAX_PD_OFFSET);
	dev_lim->max_pds = 1 << (field & 0x3f);
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_RSVD_RDD_OFFSET);
	dev_lim->reserved_rdds = field >> 4;
	MTHCA_GET(field, outbox, QUERY_DEV_LIM_MAX_RDD_OFFSET);
	dev_lim->max_rdds = 1 << (field & 0x3f);

	MTHCA_GET(size, outbox, QUERY_DEV_LIM_EEC_ENTRY_SZ_OFFSET);
	dev_lim->eec_entry_sz = size;
	MTHCA_GET(size, outbox, QUERY_DEV_LIM_QPC_ENTRY_SZ_OFFSET);
	dev_lim->qpc_entry_sz = size;
	MTHCA_GET(size, outbox, QUERY_DEV_LIM_EEEC_ENTRY_SZ_OFFSET);
	dev_lim->eeec_entry_sz = size;
	MTHCA_GET(size, outbox, QUERY_DEV_LIM_EQPC_ENTRY_SZ_OFFSET);
	dev_lim->eqpc_entry_sz = size;
	MTHCA_GET(size, outbox, QUERY_DEV_LIM_EQC_ENTRY_SZ_OFFSET);
	dev_lim->eqc_entry_sz = size;
	MTHCA_GET(size, outbox, QUERY_DEV_LIM_CQC_ENTRY_SZ_OFFSET);
	dev_lim->cqc_entry_sz = size;
	MTHCA_GET(size, outbox, QUERY_DEV_LIM_SRQ_ENTRY_SZ_OFFSET);
	dev_lim->srq_entry_sz = size;
	MTHCA_GET(size, outbox, QUERY_DEV_LIM_UAR_ENTRY_SZ_OFFSET);
	dev_lim->uar_scratch_entry_sz = size;

	if (mthca_is_memfree(dev)) {
		MTHCA_GET(field, outbox, QUERY_DEV_LIM_MAX_SRQ_SZ_OFFSET);
		dev_lim->max_srq_sz = 1 << field;
		MTHCA_GET(field, outbox, QUERY_DEV_LIM_MAX_QP_SZ_OFFSET);
		dev_lim->max_qp_sz = 1 << field;
		MTHCA_GET(field, outbox, QUERY_DEV_LIM_RSZ_SRQ_OFFSET);
		dev_lim->hca.arbel.resize_srq = field & 1;
		MTHCA_GET(field, outbox, QUERY_DEV_LIM_MAX_SG_RQ_OFFSET);
		dev_lim->max_sg = min_t(int, field, dev_lim->max_sg);
		MTHCA_GET(size, outbox, QUERY_DEV_LIM_MAX_DESC_SZ_RQ_OFFSET);
		dev_lim->max_desc_sz = min_t(int, size, dev_lim->max_desc_sz);
		MTHCA_GET(size, outbox, QUERY_DEV_LIM_MPT_ENTRY_SZ_OFFSET);
		dev_lim->mpt_entry_sz = size;
		MTHCA_GET(field, outbox, QUERY_DEV_LIM_PBL_SZ_OFFSET);
		dev_lim->hca.arbel.max_pbl_sz = 1 << (field & 0x3f);
		MTHCA_GET(dev_lim->hca.arbel.bmme_flags, outbox,
			  QUERY_DEV_LIM_BMME_FLAGS_OFFSET);
		MTHCA_GET(dev_lim->hca.arbel.reserved_lkey, outbox,
			  QUERY_DEV_LIM_RSVD_LKEY_OFFSET);
		MTHCA_GET(field, outbox, QUERY_DEV_LIM_LAMR_OFFSET);
		dev_lim->hca.arbel.lam_required = field & 1;
		MTHCA_GET(dev_lim->hca.arbel.max_icm_sz, outbox,
			  QUERY_DEV_LIM_MAX_ICM_SZ_OFFSET);

		if (dev_lim->hca.arbel.bmme_flags & 1)
			mthca_dbg(dev, "Base MM extensions: yes "
				  "(flags %d, max PBL %d, rsvd L_Key %08x)\n",
				  dev_lim->hca.arbel.bmme_flags,
				  dev_lim->hca.arbel.max_pbl_sz,
				  dev_lim->hca.arbel.reserved_lkey);
		else
			mthca_dbg(dev, "Base MM extensions: no\n");

		mthca_dbg(dev, "Max ICM size %lld MB\n",
			  (unsigned long long) dev_lim->hca.arbel.max_icm_sz >> 20);
	} else {
		MTHCA_GET(field, outbox, QUERY_DEV_LIM_MAX_SRQ_SZ_OFFSET);
		dev_lim->max_srq_sz = (1 << field) - 1;
		MTHCA_GET(field, outbox, QUERY_DEV_LIM_MAX_QP_SZ_OFFSET);
		dev_lim->max_qp_sz = (1 << field) - 1;
		MTHCA_GET(field, outbox, QUERY_DEV_LIM_MAX_AV_OFFSET);
		dev_lim->hca.tavor.max_avs = 1 << (field & 0x3f);
		dev_lim->mpt_entry_sz = MTHCA_MPT_ENTRY_SIZE;
	}

	mthca_dbg(dev, "Max QPs: %d, reserved QPs: %d, entry size: %d\n",
		  dev_lim->max_qps, dev_lim->reserved_qps, dev_lim->qpc_entry_sz);
	mthca_dbg(dev, "Max SRQs: %d, reserved SRQs: %d, entry size: %d\n",
		  dev_lim->max_srqs, dev_lim->reserved_srqs, dev_lim->srq_entry_sz);
	mthca_dbg(dev, "Max CQs: %d, reserved CQs: %d, entry size: %d\n",
		  dev_lim->max_cqs, dev_lim->reserved_cqs, dev_lim->cqc_entry_sz);
	mthca_dbg(dev, "Max EQs: %d, reserved EQs: %d, entry size: %d\n",
		  dev_lim->max_eqs, dev_lim->reserved_eqs, dev_lim->eqc_entry_sz);
	mthca_dbg(dev, "reserved MPTs: %d, reserved MTTs: %d\n",
		  dev_lim->reserved_mrws, dev_lim->reserved_mtts);
	mthca_dbg(dev, "Max PDs: %d, reserved PDs: %d, reserved UARs: %d\n",
		  dev_lim->max_pds, dev_lim->reserved_pds, dev_lim->reserved_uars);
	mthca_dbg(dev, "Max QP/MCG: %d, reserved MGMs: %d\n",
		  dev_lim->max_pds, dev_lim->reserved_mgms);
	mthca_dbg(dev, "Max CQEs: %d, max WQEs: %d, max SRQ WQEs: %d\n",
		  dev_lim->max_cq_sz, dev_lim->max_qp_sz, dev_lim->max_srq_sz);

	mthca_dbg(dev, "Flags: %08x\n", dev_lim->flags);

out:
	mthca_free_mailbox(dev, mailbox);
	return err;
}

static void get_board_id(void *vsd, char *board_id)
{
	int i;

#define VSD_OFFSET_SIG1		0x00
#define VSD_OFFSET_SIG2		0xde
#define VSD_OFFSET_MLX_BOARD_ID	0xd0
#define VSD_OFFSET_TS_BOARD_ID	0x20

#define VSD_SIGNATURE_TOPSPIN	0x5ad

	memset(board_id, 0, MTHCA_BOARD_ID_LEN);

	if (be16_to_cpup(vsd + VSD_OFFSET_SIG1) == VSD_SIGNATURE_TOPSPIN &&
	    be16_to_cpup(vsd + VSD_OFFSET_SIG2) == VSD_SIGNATURE_TOPSPIN) {
		strlcpy(board_id, vsd + VSD_OFFSET_TS_BOARD_ID, MTHCA_BOARD_ID_LEN);
	} else {
		/*
		 * The board ID is a string but the firmware byte
		 * swaps each 4-byte word before passing it back to
		 * us.  Therefore we need to swab it before printing.
		 */
		for (i = 0; i < 4; ++i)
			((u32 *) board_id)[i] =
				swab32(*(u32 *) (vsd + VSD_OFFSET_MLX_BOARD_ID + i * 4));
	}
}

int mthca_QUERY_ADAPTER(struct mthca_dev *dev,
			struct mthca_adapter *adapter)
{
	struct mthca_mailbox *mailbox;
	u32 *outbox;
	int err;

#define QUERY_ADAPTER_OUT_SIZE             0x100
#define QUERY_ADAPTER_VENDOR_ID_OFFSET     0x00
#define QUERY_ADAPTER_DEVICE_ID_OFFSET     0x04
#define QUERY_ADAPTER_REVISION_ID_OFFSET   0x08
#define QUERY_ADAPTER_INTA_PIN_OFFSET      0x10
#define QUERY_ADAPTER_VSD_OFFSET           0x20

	mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);
	outbox = mailbox->buf;

	err = mthca_cmd_box(dev, 0, mailbox->dma, 0, 0, CMD_QUERY_ADAPTER,
			    CMD_TIME_CLASS_A);

	if (err)
		goto out;

	if (!mthca_is_memfree(dev)) {
		MTHCA_GET(adapter->vendor_id, outbox,
			  QUERY_ADAPTER_VENDOR_ID_OFFSET);
		MTHCA_GET(adapter->device_id, outbox,
			  QUERY_ADAPTER_DEVICE_ID_OFFSET);
		MTHCA_GET(adapter->revision_id, outbox,
			  QUERY_ADAPTER_REVISION_ID_OFFSET);
	}
	MTHCA_GET(adapter->inta_pin, outbox,    QUERY_ADAPTER_INTA_PIN_OFFSET);

	get_board_id(outbox + QUERY_ADAPTER_VSD_OFFSET / 4,
		     adapter->board_id);

out:
	mthca_free_mailbox(dev, mailbox);
	return err;
}

int mthca_INIT_HCA(struct mthca_dev *dev,
		   struct mthca_init_hca_param *param)
{
	struct mthca_mailbox *mailbox;
	__be32 *inbox;
	int err;

#define INIT_HCA_IN_SIZE             	 0x200
#define INIT_HCA_FLAGS1_OFFSET           0x00c
#define INIT_HCA_FLAGS2_OFFSET           0x014
#define INIT_HCA_QPC_OFFSET          	 0x020
#define  INIT_HCA_QPC_BASE_OFFSET    	 (INIT_HCA_QPC_OFFSET + 0x10)
#define  INIT_HCA_LOG_QP_OFFSET      	 (INIT_HCA_QPC_OFFSET + 0x17)
#define  INIT_HCA_EEC_BASE_OFFSET    	 (INIT_HCA_QPC_OFFSET + 0x20)
#define  INIT_HCA_LOG_EEC_OFFSET     	 (INIT_HCA_QPC_OFFSET + 0x27)
#define  INIT_HCA_SRQC_BASE_OFFSET   	 (INIT_HCA_QPC_OFFSET + 0x28)
#define  INIT_HCA_LOG_SRQ_OFFSET     	 (INIT_HCA_QPC_OFFSET + 0x2f)
#define  INIT_HCA_CQC_BASE_OFFSET    	 (INIT_HCA_QPC_OFFSET + 0x30)
#define  INIT_HCA_LOG_CQ_OFFSET      	 (INIT_HCA_QPC_OFFSET + 0x37)
#define  INIT_HCA_EQPC_BASE_OFFSET   	 (INIT_HCA_QPC_OFFSET + 0x40)
#define  INIT_HCA_EEEC_BASE_OFFSET   	 (INIT_HCA_QPC_OFFSET + 0x50)
#define  INIT_HCA_EQC_BASE_OFFSET    	 (INIT_HCA_QPC_OFFSET + 0x60)
#define  INIT_HCA_LOG_EQ_OFFSET      	 (INIT_HCA_QPC_OFFSET + 0x67)
#define  INIT_HCA_RDB_BASE_OFFSET    	 (INIT_HCA_QPC_OFFSET + 0x70)
#define INIT_HCA_UDAV_OFFSET         	 0x0b0
#define  INIT_HCA_UDAV_LKEY_OFFSET   	 (INIT_HCA_UDAV_OFFSET + 0x0)
#define  INIT_HCA_UDAV_PD_OFFSET     	 (INIT_HCA_UDAV_OFFSET + 0x4)
#define INIT_HCA_MCAST_OFFSET        	 0x0c0
#define  INIT_HCA_MC_BASE_OFFSET         (INIT_HCA_MCAST_OFFSET + 0x00)
#define  INIT_HCA_LOG_MC_ENTRY_SZ_OFFSET (INIT_HCA_MCAST_OFFSET + 0x12)
#define  INIT_HCA_MC_HASH_SZ_OFFSET      (INIT_HCA_MCAST_OFFSET + 0x16)
#define  INIT_HCA_LOG_MC_TABLE_SZ_OFFSET (INIT_HCA_MCAST_OFFSET + 0x1b)
#define INIT_HCA_TPT_OFFSET              0x0f0
#define  INIT_HCA_MPT_BASE_OFFSET        (INIT_HCA_TPT_OFFSET + 0x00)
#define  INIT_HCA_MTT_SEG_SZ_OFFSET      (INIT_HCA_TPT_OFFSET + 0x09)
#define  INIT_HCA_LOG_MPT_SZ_OFFSET      (INIT_HCA_TPT_OFFSET + 0x0b)
#define  INIT_HCA_MTT_BASE_OFFSET        (INIT_HCA_TPT_OFFSET + 0x10)
#define INIT_HCA_UAR_OFFSET              0x120
#define  INIT_HCA_UAR_BASE_OFFSET        (INIT_HCA_UAR_OFFSET + 0x00)
#define  INIT_HCA_UARC_SZ_OFFSET         (INIT_HCA_UAR_OFFSET + 0x09)
#define  INIT_HCA_LOG_UAR_SZ_OFFSET      (INIT_HCA_UAR_OFFSET + 0x0a)
#define  INIT_HCA_UAR_PAGE_SZ_OFFSET     (INIT_HCA_UAR_OFFSET + 0x0b)
#define  INIT_HCA_UAR_SCATCH_BASE_OFFSET (INIT_HCA_UAR_OFFSET + 0x10)
#define  INIT_HCA_UAR_CTX_BASE_OFFSET    (INIT_HCA_UAR_OFFSET + 0x18)

	mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);
	inbox = mailbox->buf;

	memset(inbox, 0, INIT_HCA_IN_SIZE);

	if (dev->mthca_flags & MTHCA_FLAG_SINAI_OPT)
		MTHCA_PUT(inbox, 0x1, INIT_HCA_FLAGS1_OFFSET);

#if defined(__LITTLE_ENDIAN)
	*(inbox + INIT_HCA_FLAGS2_OFFSET / 4) &= ~cpu_to_be32(1 << 1);
#elif defined(__BIG_ENDIAN)
	*(inbox + INIT_HCA_FLAGS2_OFFSET / 4) |= cpu_to_be32(1 << 1);
#else
#error Host endianness not defined
#endif
	/* Check port for UD address vector: */
	*(inbox + INIT_HCA_FLAGS2_OFFSET / 4) |= cpu_to_be32(1);

	/* Enable IPoIB checksumming if we can: */
	if (dev->device_cap_flags & IB_DEVICE_UD_IP_CSUM)
		*(inbox + INIT_HCA_FLAGS2_OFFSET / 4) |= cpu_to_be32(7 << 3);

	/* We leave wqe_quota, responder_exu, etc as 0 (default) */

	/* QPC/EEC/CQC/EQC/RDB attributes */

	MTHCA_PUT(inbox, param->qpc_base,     INIT_HCA_QPC_BASE_OFFSET);
	MTHCA_PUT(inbox, param->log_num_qps,  INIT_HCA_LOG_QP_OFFSET);
	MTHCA_PUT(inbox, param->eec_base,     INIT_HCA_EEC_BASE_OFFSET);
	MTHCA_PUT(inbox, param->log_num_eecs, INIT_HCA_LOG_EEC_OFFSET);
	MTHCA_PUT(inbox, param->srqc_base,    INIT_HCA_SRQC_BASE_OFFSET);
	MTHCA_PUT(inbox, param->log_num_srqs, INIT_HCA_LOG_SRQ_OFFSET);
	MTHCA_PUT(inbox, param->cqc_base,     INIT_HCA_CQC_BASE_OFFSET);
	MTHCA_PUT(inbox, param->log_num_cqs,  INIT_HCA_LOG_CQ_OFFSET);
	MTHCA_PUT(inbox, param->eqpc_base,    INIT_HCA_EQPC_BASE_OFFSET);
	MTHCA_PUT(inbox, param->eeec_base,    INIT_HCA_EEEC_BASE_OFFSET);
	MTHCA_PUT(inbox, param->eqc_base,     INIT_HCA_EQC_BASE_OFFSET);
	MTHCA_PUT(inbox, param->log_num_eqs,  INIT_HCA_LOG_EQ_OFFSET);
	MTHCA_PUT(inbox, param->rdb_base,     INIT_HCA_RDB_BASE_OFFSET);

	/* UD AV attributes */

	/* multicast attributes */

	MTHCA_PUT(inbox, param->mc_base,         INIT_HCA_MC_BASE_OFFSET);
	MTHCA_PUT(inbox, param->log_mc_entry_sz, INIT_HCA_LOG_MC_ENTRY_SZ_OFFSET);
	MTHCA_PUT(inbox, param->mc_hash_sz,      INIT_HCA_MC_HASH_SZ_OFFSET);
	MTHCA_PUT(inbox, param->log_mc_table_sz, INIT_HCA_LOG_MC_TABLE_SZ_OFFSET);

	/* TPT attributes */

	MTHCA_PUT(inbox, param->mpt_base,   INIT_HCA_MPT_BASE_OFFSET);
	if (!mthca_is_memfree(dev))
		MTHCA_PUT(inbox, param->mtt_seg_sz, INIT_HCA_MTT_SEG_SZ_OFFSET);
	MTHCA_PUT(inbox, param->log_mpt_sz, INIT_HCA_LOG_MPT_SZ_OFFSET);
	MTHCA_PUT(inbox, param->mtt_base,   INIT_HCA_MTT_BASE_OFFSET);

	/* UAR attributes */
	{
		u8 uar_page_sz = PAGE_SHIFT - 12;
		MTHCA_PUT(inbox, uar_page_sz, INIT_HCA_UAR_PAGE_SZ_OFFSET);
	}

	MTHCA_PUT(inbox, param->uar_scratch_base, INIT_HCA_UAR_SCATCH_BASE_OFFSET);

	if (mthca_is_memfree(dev)) {
		MTHCA_PUT(inbox, param->log_uarc_sz, INIT_HCA_UARC_SZ_OFFSET);
		MTHCA_PUT(inbox, param->log_uar_sz,  INIT_HCA_LOG_UAR_SZ_OFFSET);
		MTHCA_PUT(inbox, param->uarc_base,   INIT_HCA_UAR_CTX_BASE_OFFSET);
	}

	err = mthca_cmd(dev, mailbox->dma, 0, 0,
			CMD_INIT_HCA, CMD_TIME_CLASS_D);

	mthca_free_mailbox(dev, mailbox);
	return err;
}

int mthca_INIT_IB(struct mthca_dev *dev,
		  struct mthca_init_ib_param *param,
		  int port)
{
	struct mthca_mailbox *mailbox;
	u32 *inbox;
	int err;
	u32 flags;

#define INIT_IB_IN_SIZE          56
#define INIT_IB_FLAGS_OFFSET     0x00
#define INIT_IB_FLAG_SIG         (1 << 18)
#define INIT_IB_FLAG_NG          (1 << 17)
#define INIT_IB_FLAG_G0          (1 << 16)
#define INIT_IB_VL_SHIFT         4
#define INIT_IB_PORT_WIDTH_SHIFT 8
#define INIT_IB_MTU_SHIFT        12
#define INIT_IB_MAX_GID_OFFSET   0x06
#define INIT_IB_MAX_PKEY_OFFSET  0x0a
#define INIT_IB_GUID0_OFFSET     0x10
#define INIT_IB_NODE_GUID_OFFSET 0x18
#define INIT_IB_SI_GUID_OFFSET   0x20

	mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);
	inbox = mailbox->buf;

	memset(inbox, 0, INIT_IB_IN_SIZE);

	flags = 0;
	flags |= param->set_guid0     ? INIT_IB_FLAG_G0  : 0;
	flags |= param->set_node_guid ? INIT_IB_FLAG_NG  : 0;
	flags |= param->set_si_guid   ? INIT_IB_FLAG_SIG : 0;
	flags |= param->vl_cap << INIT_IB_VL_SHIFT;
	flags |= param->port_width << INIT_IB_PORT_WIDTH_SHIFT;
	flags |= param->mtu_cap << INIT_IB_MTU_SHIFT;
	MTHCA_PUT(inbox, flags, INIT_IB_FLAGS_OFFSET);

	MTHCA_PUT(inbox, param->gid_cap,   INIT_IB_MAX_GID_OFFSET);
	MTHCA_PUT(inbox, param->pkey_cap,  INIT_IB_MAX_PKEY_OFFSET);
	MTHCA_PUT(inbox, param->guid0,     INIT_IB_GUID0_OFFSET);
	MTHCA_PUT(inbox, param->node_guid, INIT_IB_NODE_GUID_OFFSET);
	MTHCA_PUT(inbox, param->si_guid,   INIT_IB_SI_GUID_OFFSET);

	err = mthca_cmd(dev, mailbox->dma, port, 0, CMD_INIT_IB,
			CMD_TIME_CLASS_A);

	mthca_free_mailbox(dev, mailbox);
	return err;
}

int mthca_CLOSE_IB(struct mthca_dev *dev, int port)
{
	return mthca_cmd(dev, 0, port, 0, CMD_CLOSE_IB, CMD_TIME_CLASS_A);
}

int mthca_CLOSE_HCA(struct mthca_dev *dev, int panic)
{
	return mthca_cmd(dev, 0, 0, panic, CMD_CLOSE_HCA, CMD_TIME_CLASS_C);
}

int mthca_SET_IB(struct mthca_dev *dev, struct mthca_set_ib_param *param,
		 int port)
{
	struct mthca_mailbox *mailbox;
	u32 *inbox;
	int err;
	u32 flags = 0;

#define SET_IB_IN_SIZE         0x40
#define SET_IB_FLAGS_OFFSET    0x00
#define SET_IB_FLAG_SIG        (1 << 18)
#define SET_IB_FLAG_RQK        (1 <<  0)
#define SET_IB_CAP_MASK_OFFSET 0x04
#define SET_IB_SI_GUID_OFFSET  0x08

	mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);
	inbox = mailbox->buf;

	memset(inbox, 0, SET_IB_IN_SIZE);

	flags |= param->set_si_guid     ? SET_IB_FLAG_SIG : 0;
	flags |= param->reset_qkey_viol ? SET_IB_FLAG_RQK : 0;
	MTHCA_PUT(inbox, flags, SET_IB_FLAGS_OFFSET);

	MTHCA_PUT(inbox, param->cap_mask, SET_IB_CAP_MASK_OFFSET);
	MTHCA_PUT(inbox, param->si_guid,  SET_IB_SI_GUID_OFFSET);

	err = mthca_cmd(dev, mailbox->dma, port, 0, CMD_SET_IB,
			CMD_TIME_CLASS_B);

	mthca_free_mailbox(dev, mailbox);
	return err;
}

int mthca_MAP_ICM(struct mthca_dev *dev, struct mthca_icm *icm, u64 virt)
{
	return mthca_map_cmd(dev, CMD_MAP_ICM, icm, virt);
}

int mthca_MAP_ICM_page(struct mthca_dev *dev, u64 dma_addr, u64 virt)
{
	struct mthca_mailbox *mailbox;
	__be64 *inbox;
	int err;

	mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);
	inbox = mailbox->buf;

	inbox[0] = cpu_to_be64(virt);
	inbox[1] = cpu_to_be64(dma_addr);

	err = mthca_cmd(dev, mailbox->dma, 1, 0, CMD_MAP_ICM,
			CMD_TIME_CLASS_B);

	mthca_free_mailbox(dev, mailbox);

	if (!err)
		mthca_dbg(dev, "Mapped page at %llx to %llx for ICM.\n",
			  (unsigned long long) dma_addr, (unsigned long long) virt);

	return err;
}

int mthca_UNMAP_ICM(struct mthca_dev *dev, u64 virt, u32 page_count)
{
	mthca_dbg(dev, "Unmapping %d pages at %llx from ICM.\n",
		  page_count, (unsigned long long) virt);

	return mthca_cmd(dev, virt, page_count, 0,
			CMD_UNMAP_ICM, CMD_TIME_CLASS_B);
}

int mthca_MAP_ICM_AUX(struct mthca_dev *dev, struct mthca_icm *icm)
{
	return mthca_map_cmd(dev, CMD_MAP_ICM_AUX, icm, -1);
}

int mthca_UNMAP_ICM_AUX(struct mthca_dev *dev)
{
	return mthca_cmd(dev, 0, 0, 0, CMD_UNMAP_ICM_AUX, CMD_TIME_CLASS_B);
}

int mthca_SET_ICM_SIZE(struct mthca_dev *dev, u64 icm_size, u64 *aux_pages)
{
	int ret = mthca_cmd_imm(dev, icm_size, aux_pages, 0,
			0, CMD_SET_ICM_SIZE, CMD_TIME_CLASS_A);

	if (ret)
		return ret;

	/*
	 * Round up number of system pages needed in case
	 * MTHCA_ICM_PAGE_SIZE < PAGE_SIZE.
	 */
	*aux_pages = ALIGN(*aux_pages, PAGE_SIZE / MTHCA_ICM_PAGE_SIZE) >>
		(PAGE_SHIFT - MTHCA_ICM_PAGE_SHIFT);

	return 0;
}

int mthca_SW2HW_MPT(struct mthca_dev *dev, struct mthca_mailbox *mailbox,
		    int mpt_index)
{
	return mthca_cmd(dev, mailbox->dma, mpt_index, 0, CMD_SW2HW_MPT,
			 CMD_TIME_CLASS_B);
}

int mthca_HW2SW_MPT(struct mthca_dev *dev, struct mthca_mailbox *mailbox,
		    int mpt_index)
{
	return mthca_cmd_box(dev, 0, mailbox ? mailbox->dma : 0, mpt_index,
			     !mailbox, CMD_HW2SW_MPT,
			     CMD_TIME_CLASS_B);
}

int mthca_WRITE_MTT(struct mthca_dev *dev, struct mthca_mailbox *mailbox,
		    int num_mtt)
{
	return mthca_cmd(dev, mailbox->dma, num_mtt, 0, CMD_WRITE_MTT,
			 CMD_TIME_CLASS_B);
}

int mthca_SYNC_TPT(struct mthca_dev *dev)
{
	return mthca_cmd(dev, 0, 0, 0, CMD_SYNC_TPT, CMD_TIME_CLASS_B);
}

int mthca_MAP_EQ(struct mthca_dev *dev, u64 event_mask, int unmap,
		 int eq_num)
{
	mthca_dbg(dev, "%s mask %016llx for eqn %d\n",
		  unmap ? "Clearing" : "Setting",
		  (unsigned long long) event_mask, eq_num);
	return mthca_cmd(dev, event_mask, (unmap << 31) | eq_num,
			 0, CMD_MAP_EQ, CMD_TIME_CLASS_B);
}

int mthca_SW2HW_EQ(struct mthca_dev *dev, struct mthca_mailbox *mailbox,
		   int eq_num)
{
	return mthca_cmd(dev, mailbox->dma, eq_num, 0, CMD_SW2HW_EQ,
			 CMD_TIME_CLASS_A);
}

int mthca_HW2SW_EQ(struct mthca_dev *dev, struct mthca_mailbox *mailbox,
		   int eq_num)
{
	return mthca_cmd_box(dev, 0, mailbox->dma, eq_num, 0,
			     CMD_HW2SW_EQ,
			     CMD_TIME_CLASS_A);
}

int mthca_SW2HW_CQ(struct mthca_dev *dev, struct mthca_mailbox *mailbox,
		   int cq_num)
{
	return mthca_cmd(dev, mailbox->dma, cq_num, 0, CMD_SW2HW_CQ,
			CMD_TIME_CLASS_A);
}

int mthca_HW2SW_CQ(struct mthca_dev *dev, struct mthca_mailbox *mailbox,
		   int cq_num)
{
	return mthca_cmd_box(dev, 0, mailbox->dma, cq_num, 0,
			     CMD_HW2SW_CQ,
			     CMD_TIME_CLASS_A);
}

int mthca_RESIZE_CQ(struct mthca_dev *dev, int cq_num, u32 lkey, u8 log_size)
{
	struct mthca_mailbox *mailbox;
	__be32 *inbox;
	int err;

#define RESIZE_CQ_IN_SIZE		0x40
#define RESIZE_CQ_LOG_SIZE_OFFSET	0x0c
#define RESIZE_CQ_LKEY_OFFSET		0x1c

	mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);
	inbox = mailbox->buf;

	memset(inbox, 0, RESIZE_CQ_IN_SIZE);
	/*
	 * Leave start address fields zeroed out -- mthca assumes that
	 * MRs for CQs always start at virtual address 0.
	 */
	MTHCA_PUT(inbox, log_size, RESIZE_CQ_LOG_SIZE_OFFSET);
	MTHCA_PUT(inbox, lkey,     RESIZE_CQ_LKEY_OFFSET);

	err = mthca_cmd(dev, mailbox->dma, cq_num, 1, CMD_RESIZE_CQ,
			CMD_TIME_CLASS_B);

	mthca_free_mailbox(dev, mailbox);
	return err;
}

int mthca_SW2HW_SRQ(struct mthca_dev *dev, struct mthca_mailbox *mailbox,
		    int srq_num)
{
	return mthca_cmd(dev, mailbox->dma, srq_num, 0, CMD_SW2HW_SRQ,
			CMD_TIME_CLASS_A);
}

int mthca_HW2SW_SRQ(struct mthca_dev *dev, struct mthca_mailbox *mailbox,
		    int srq_num)
{
	return mthca_cmd_box(dev, 0, mailbox->dma, srq_num, 0,
			     CMD_HW2SW_SRQ,
			     CMD_TIME_CLASS_A);
}

int mthca_QUERY_SRQ(struct mthca_dev *dev, u32 num,
		    struct mthca_mailbox *mailbox)
{
	return mthca_cmd_box(dev, 0, mailbox->dma, num, 0,
			     CMD_QUERY_SRQ, CMD_TIME_CLASS_A);
}

int mthca_ARM_SRQ(struct mthca_dev *dev, int srq_num, int limit)
{
	return mthca_cmd(dev, limit, srq_num, 0, CMD_ARM_SRQ,
			 CMD_TIME_CLASS_B);
}

int mthca_MODIFY_QP(struct mthca_dev *dev, enum ib_qp_state cur,
		    enum ib_qp_state next, u32 num, int is_ee,
		    struct mthca_mailbox *mailbox, u32 optmask)
{
	static const u16 op[IB_QPS_ERR + 1][IB_QPS_ERR + 1] = {
		[IB_QPS_RESET] = {
			[IB_QPS_RESET]	= CMD_ERR2RST_QPEE,
			[IB_QPS_ERR]	= CMD_2ERR_QPEE,
			[IB_QPS_INIT]	= CMD_RST2INIT_QPEE,
		},
		[IB_QPS_INIT]  = {
			[IB_QPS_RESET]	= CMD_ERR2RST_QPEE,
			[IB_QPS_ERR]	= CMD_2ERR_QPEE,
			[IB_QPS_INIT]	= CMD_INIT2INIT_QPEE,
			[IB_QPS_RTR]	= CMD_INIT2RTR_QPEE,
		},
		[IB_QPS_RTR]   = {
			[IB_QPS_RESET]	= CMD_ERR2RST_QPEE,
			[IB_QPS_ERR]	= CMD_2ERR_QPEE,
			[IB_QPS_RTS]	= CMD_RTR2RTS_QPEE,
		},
		[IB_QPS_RTS]   = {
			[IB_QPS_RESET]	= CMD_ERR2RST_QPEE,
			[IB_QPS_ERR]	= CMD_2ERR_QPEE,
			[IB_QPS_RTS]	= CMD_RTS2RTS_QPEE,
			[IB_QPS_SQD]	= CMD_RTS2SQD_QPEE,
		},
		[IB_QPS_SQD] = {
			[IB_QPS_RESET]	= CMD_ERR2RST_QPEE,
			[IB_QPS_ERR]	= CMD_2ERR_QPEE,
			[IB_QPS_RTS]	= CMD_SQD2RTS_QPEE,
			[IB_QPS_SQD]	= CMD_SQD2SQD_QPEE,
		},
		[IB_QPS_SQE] = {
			[IB_QPS_RESET]	= CMD_ERR2RST_QPEE,
			[IB_QPS_ERR]	= CMD_2ERR_QPEE,
			[IB_QPS_RTS]	= CMD_SQERR2RTS_QPEE,
		},
		[IB_QPS_ERR] = {
			[IB_QPS_RESET]	= CMD_ERR2RST_QPEE,
			[IB_QPS_ERR]	= CMD_2ERR_QPEE,
		}
	};

	u8 op_mod = 0;
	int my_mailbox = 0;
	int err;

	if (op[cur][next] == CMD_ERR2RST_QPEE) {
		op_mod = 3;	/* don't write outbox, any->reset */

		/* For debugging */
		if (!mailbox) {
			mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
			if (!IS_ERR(mailbox)) {
				my_mailbox = 1;
				op_mod     = 2;	/* write outbox, any->reset */
			} else
				mailbox = NULL;
		}

		err = mthca_cmd_box(dev, 0, mailbox ? mailbox->dma : 0,
				    (!!is_ee << 24) | num, op_mod,
				    op[cur][next], CMD_TIME_CLASS_C);

		if (0 && mailbox) {
			int i;
			mthca_dbg(dev, "Dumping QP context:\n");
			printk(" %08x\n", be32_to_cpup(mailbox->buf));
			for (i = 0; i < 0x100 / 4; ++i) {
				if (i % 8 == 0)
					printk("[%02x] ", i * 4);
				printk(" %08x",
				       be32_to_cpu(((__be32 *) mailbox->buf)[i + 2]));
				if ((i + 1) % 8 == 0)
					printk("\n");
			}
		}

		if (my_mailbox)
			mthca_free_mailbox(dev, mailbox);
	} else {
		if (0) {
			int i;
			mthca_dbg(dev, "Dumping QP context:\n");
			printk("  opt param mask: %08x\n", be32_to_cpup(mailbox->buf));
			for (i = 0; i < 0x100 / 4; ++i) {
				if (i % 8 == 0)
					printk("  [%02x] ", i * 4);
				printk(" %08x",
				       be32_to_cpu(((__be32 *) mailbox->buf)[i + 2]));
				if ((i + 1) % 8 == 0)
					printk("\n");
			}
		}

		err = mthca_cmd(dev, mailbox->dma, optmask | (!!is_ee << 24) | num,
				op_mod, op[cur][next], CMD_TIME_CLASS_C);
	}

	return err;
}

int mthca_QUERY_QP(struct mthca_dev *dev, u32 num, int is_ee,
		   struct mthca_mailbox *mailbox)
{
	return mthca_cmd_box(dev, 0, mailbox->dma, (!!is_ee << 24) | num, 0,
			     CMD_QUERY_QPEE, CMD_TIME_CLASS_A);
}

int mthca_CONF_SPECIAL_QP(struct mthca_dev *dev, int type, u32 qpn)
{
	u8 op_mod;

	switch (type) {
	case IB_QPT_SMI:
		op_mod = 0;
		break;
	case IB_QPT_GSI:
		op_mod = 1;
		break;
	case IB_QPT_RAW_IPV6:
		op_mod = 2;
		break;
	case IB_QPT_RAW_ETHERTYPE:
		op_mod = 3;
		break;
	default:
		return -EINVAL;
	}

	return mthca_cmd(dev, 0, qpn, op_mod, CMD_CONF_SPECIAL_QP,
			 CMD_TIME_CLASS_B);
}

int mthca_MAD_IFC(struct mthca_dev *dev, int ignore_mkey, int ignore_bkey,
		  int port, struct ib_wc *in_wc, struct ib_grh *in_grh,
		  void *in_mad, void *response_mad)
{
	struct mthca_mailbox *inmailbox, *outmailbox;
	void *inbox;
	int err;
	u32 in_modifier = port;
	u8 op_modifier = 0;

#define MAD_IFC_BOX_SIZE      0x400
#define MAD_IFC_MY_QPN_OFFSET 0x100
#define MAD_IFC_RQPN_OFFSET   0x108
#define MAD_IFC_SL_OFFSET     0x10c
#define MAD_IFC_G_PATH_OFFSET 0x10d
#define MAD_IFC_RLID_OFFSET   0x10e
#define MAD_IFC_PKEY_OFFSET   0x112
#define MAD_IFC_GRH_OFFSET    0x140

	inmailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
	if (IS_ERR(inmailbox))
		return PTR_ERR(inmailbox);
	inbox = inmailbox->buf;

	outmailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
	if (IS_ERR(outmailbox)) {
		mthca_free_mailbox(dev, inmailbox);
		return PTR_ERR(outmailbox);
	}

	memcpy(inbox, in_mad, 256);

	/*
	 * Key check traps can't be generated unless we have in_wc to
	 * tell us where to send the trap.
	 */
	if (ignore_mkey || !in_wc)
		op_modifier |= 0x1;
	if (ignore_bkey || !in_wc)
		op_modifier |= 0x2;

	if (in_wc) {
		u8 val;

		memset(inbox + 256, 0, 256);

		MTHCA_PUT(inbox, in_wc->qp->qp_num, MAD_IFC_MY_QPN_OFFSET);
		MTHCA_PUT(inbox, in_wc->src_qp,     MAD_IFC_RQPN_OFFSET);

		val = in_wc->sl << 4;
		MTHCA_PUT(inbox, val,               MAD_IFC_SL_OFFSET);

		val = in_wc->dlid_path_bits |
			(in_wc->wc_flags & IB_WC_GRH ? 0x80 : 0);
		MTHCA_PUT(inbox, val,               MAD_IFC_G_PATH_OFFSET);

		MTHCA_PUT(inbox, in_wc->slid,       MAD_IFC_RLID_OFFSET);
		MTHCA_PUT(inbox, in_wc->pkey_index, MAD_IFC_PKEY_OFFSET);

		if (in_grh)
			memcpy(inbox + MAD_IFC_GRH_OFFSET, in_grh, 40);

		op_modifier |= 0x4;

		in_modifier |= in_wc->slid << 16;
	}

	err = mthca_cmd_box(dev, inmailbox->dma, outmailbox->dma,
			    in_modifier, op_modifier,
			    CMD_MAD_IFC, CMD_TIME_CLASS_C);

	if (!err)
		memcpy(response_mad, outmailbox->buf, 256);

	mthca_free_mailbox(dev, inmailbox);
	mthca_free_mailbox(dev, outmailbox);
	return err;
}

int mthca_READ_MGM(struct mthca_dev *dev, int index,
		   struct mthca_mailbox *mailbox)
{
	return mthca_cmd_box(dev, 0, mailbox->dma, index, 0,
			     CMD_READ_MGM, CMD_TIME_CLASS_A);
}

int mthca_WRITE_MGM(struct mthca_dev *dev, int index,
		    struct mthca_mailbox *mailbox)
{
	return mthca_cmd(dev, mailbox->dma, index, 0, CMD_WRITE_MGM,
			 CMD_TIME_CLASS_A);
}

int mthca_MGID_HASH(struct mthca_dev *dev, struct mthca_mailbox *mailbox,
		    u16 *hash)
{
	u64 imm;
	int err;

	err = mthca_cmd_imm(dev, mailbox->dma, &imm, 0, 0, CMD_MGID_HASH,
			    CMD_TIME_CLASS_A);

	*hash = imm;
	return err;
}

int mthca_NOP(struct mthca_dev *dev)
{
	return mthca_cmd(dev, 0, 0x1f, 0, CMD_NOP, msecs_to_jiffies(100));
}