summaryrefslogtreecommitdiffstats
path: root/drivers/net/ethernet/chelsio/cxgb4/cxgb4_dcb.c
blob: 4fe33606f372755efb2bcef46f28c68b7d763312 (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
/*
 *  Copyright (C) 2013-2014 Chelsio Communications.  All rights reserved.
 *
 *  Written by Anish Bhatt (anish@chelsio.com)
 *	       Casey Leedom (leedom@chelsio.com)
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms and conditions of the GNU General Public License,
 *  version 2, as published by the Free Software Foundation.
 *
 *  This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 *  more details.
 *
 *  The full GNU General Public License is included in this distribution in
 *  the file called "COPYING".
 *
 */

#include "cxgb4.h"

/* DCBx version control
 */
char *dcb_ver_array[] = {
	"Unknown",
	"DCBx-CIN",
	"DCBx-CEE 1.01",
	"DCBx-IEEE",
	"", "", "",
	"Auto Negotiated"
};

/* Initialize a port's Data Center Bridging state.  Typically used after a
 * Link Down event.
 */
void cxgb4_dcb_state_init(struct net_device *dev)
{
	struct port_info *pi = netdev2pinfo(dev);
	struct port_dcb_info *dcb = &pi->dcb;
	int version_temp = dcb->dcb_version;

	memset(dcb, 0, sizeof(struct port_dcb_info));
	dcb->state = CXGB4_DCB_STATE_START;
	if (version_temp)
		dcb->dcb_version = version_temp;

	netdev_dbg(dev, "%s: Initializing DCB state for port[%d]\n",
		    __func__, pi->port_id);
}

void cxgb4_dcb_version_init(struct net_device *dev)
{
	struct port_info *pi = netdev2pinfo(dev);
	struct port_dcb_info *dcb = &pi->dcb;

	/* Any writes here are only done on kernels that exlicitly need
	 * a specific version, say < 2.6.38 which only support CEE
	 */
	dcb->dcb_version = FW_PORT_DCB_VER_AUTO;
}

static void cxgb4_dcb_cleanup_apps(struct net_device *dev)
{
	struct port_info *pi = netdev2pinfo(dev);
	struct adapter *adap = pi->adapter;
	struct port_dcb_info *dcb = &pi->dcb;
	struct dcb_app app;
	int i, err;

	/* zero priority implies remove */
	app.priority = 0;

	for (i = 0; i < CXGB4_MAX_DCBX_APP_SUPPORTED; i++) {
		/* Check if app list is exhausted */
		if (!dcb->app_priority[i].protocolid)
			break;

		app.protocol = dcb->app_priority[i].protocolid;

		if (dcb->dcb_version == FW_PORT_DCB_VER_IEEE) {
			app.priority = dcb->app_priority[i].user_prio_map;
			app.selector = dcb->app_priority[i].sel_field + 1;
			err = dcb_ieee_delapp(dev, &app);
		} else {
			app.selector = !!(dcb->app_priority[i].sel_field);
			err = dcb_setapp(dev, &app);
		}

		if (err) {
			dev_err(adap->pdev_dev,
				"Failed DCB Clear %s Application Priority: sel=%d, prot=%d, , err=%d\n",
				dcb_ver_array[dcb->dcb_version], app.selector,
				app.protocol, -err);
			break;
		}
	}
}

/* Finite State machine for Data Center Bridging.
 */
void cxgb4_dcb_state_fsm(struct net_device *dev,
			 enum cxgb4_dcb_state_input transition_to)
{
	struct port_info *pi = netdev2pinfo(dev);
	struct port_dcb_info *dcb = &pi->dcb;
	struct adapter *adap = pi->adapter;
	enum cxgb4_dcb_state current_state = dcb->state;

	netdev_dbg(dev, "%s: State change from %d to %d for %s\n",
		    __func__, dcb->state, transition_to, dev->name);

	switch (current_state) {
	case CXGB4_DCB_STATE_START: {
		switch (transition_to) {
		case CXGB4_DCB_INPUT_FW_DISABLED: {
			/* we're going to use Host DCB */
			dcb->state = CXGB4_DCB_STATE_HOST;
			dcb->supported = CXGB4_DCBX_HOST_SUPPORT;
			break;
		}

		case CXGB4_DCB_INPUT_FW_ENABLED: {
			/* we're going to use Firmware DCB */
			dcb->state = CXGB4_DCB_STATE_FW_INCOMPLETE;
			dcb->supported = DCB_CAP_DCBX_LLD_MANAGED;
			if (dcb->dcb_version == FW_PORT_DCB_VER_IEEE)
				dcb->supported |= DCB_CAP_DCBX_VER_IEEE;
			else
				dcb->supported |= DCB_CAP_DCBX_VER_CEE;
			break;
		}

		case CXGB4_DCB_INPUT_FW_INCOMPLETE: {
			/* expected transition */
			break;
		}

		case CXGB4_DCB_INPUT_FW_ALLSYNCED: {
			dcb->state = CXGB4_DCB_STATE_FW_ALLSYNCED;
			break;
		}

		default:
			goto bad_state_input;
		}
		break;
	}

	case CXGB4_DCB_STATE_FW_INCOMPLETE: {
		switch (transition_to) {
		case CXGB4_DCB_INPUT_FW_ENABLED: {
			/* we're alreaady in firmware DCB mode */
			break;
		}

		case CXGB4_DCB_INPUT_FW_INCOMPLETE: {
			/* we're already incomplete */
			break;
		}

		case CXGB4_DCB_INPUT_FW_ALLSYNCED: {
			dcb->state = CXGB4_DCB_STATE_FW_ALLSYNCED;
			dcb->enabled = 1;
			linkwatch_fire_event(dev);
			break;
		}

		default:
			goto bad_state_input;
		}
		break;
	}

	case CXGB4_DCB_STATE_FW_ALLSYNCED: {
		switch (transition_to) {
		case CXGB4_DCB_INPUT_FW_ENABLED: {
			/* we're alreaady in firmware DCB mode */
			break;
		}

		case CXGB4_DCB_INPUT_FW_INCOMPLETE: {
			/* We were successfully running with firmware DCB but
			 * now it's telling us that it's in an "incomplete
			 * state.  We need to reset back to a ground state
			 * of incomplete.
			 */
			cxgb4_dcb_cleanup_apps(dev);
			cxgb4_dcb_state_init(dev);
			dcb->state = CXGB4_DCB_STATE_FW_INCOMPLETE;
			dcb->supported = CXGB4_DCBX_FW_SUPPORT;
			linkwatch_fire_event(dev);
			break;
		}

		case CXGB4_DCB_INPUT_FW_ALLSYNCED: {
			/* we're already all sync'ed
			 * this is only applicable for IEEE or
			 * when another VI already completed negotiaton
			 */
			dcb->enabled = 1;
			linkwatch_fire_event(dev);
			break;
		}

		default:
			goto bad_state_input;
		}
		break;
	}

	case CXGB4_DCB_STATE_HOST: {
		switch (transition_to) {
		case CXGB4_DCB_INPUT_FW_DISABLED: {
			/* we're alreaady in Host DCB mode */
			break;
		}

		default:
			goto bad_state_input;
		}
		break;
	}

	default:
		goto bad_state_transition;
	}
	return;

bad_state_input:
	dev_err(adap->pdev_dev, "cxgb4_dcb_state_fsm: illegal input symbol %d\n",
		transition_to);
	return;

bad_state_transition:
	dev_err(adap->pdev_dev, "cxgb4_dcb_state_fsm: bad state transition, state = %d, input = %d\n",
		current_state, transition_to);
}

/* Handle a DCB/DCBX update message from the firmware.
 */
void cxgb4_dcb_handle_fw_update(struct adapter *adap,
				const struct fw_port_cmd *pcmd)
{
	const union fw_port_dcb *fwdcb = &pcmd->u.dcb;
	int port = FW_PORT_CMD_PORTID_GET(be32_to_cpu(pcmd->op_to_portid));
	struct net_device *dev = adap->port[port];
	struct port_info *pi = netdev_priv(dev);
	struct port_dcb_info *dcb = &pi->dcb;
	int dcb_type = pcmd->u.dcb.pgid.type;
	int dcb_running_version;

	/* Handle Firmware DCB Control messages separately since they drive
	 * our state machine.
	 */
	if (dcb_type == FW_PORT_DCB_TYPE_CONTROL) {
		enum cxgb4_dcb_state_input input =
			((pcmd->u.dcb.control.all_syncd_pkd &
			  FW_PORT_CMD_ALL_SYNCD)
			 ? CXGB4_DCB_STATE_FW_ALLSYNCED
			 : CXGB4_DCB_STATE_FW_INCOMPLETE);

		if (dcb->dcb_version != FW_PORT_DCB_VER_UNKNOWN) {
			dcb_running_version = FW_PORT_CMD_DCB_VERSION_GET(
				be16_to_cpu(
				pcmd->u.dcb.control.dcb_version_to_app_state));
			if (dcb_running_version == FW_PORT_DCB_VER_CEE1D01 ||
			    dcb_running_version == FW_PORT_DCB_VER_IEEE) {
				dcb->dcb_version = dcb_running_version;
				dev_warn(adap->pdev_dev, "Interface %s is running %s\n",
					 dev->name,
					 dcb_ver_array[dcb->dcb_version]);
			} else {
				dev_warn(adap->pdev_dev,
					 "Something screwed up, requested firmware for %s, but firmware returned %s instead\n",
					 dcb_ver_array[dcb->dcb_version],
					 dcb_ver_array[dcb_running_version]);
				dcb->dcb_version = FW_PORT_DCB_VER_UNKNOWN;
			}
		}

		cxgb4_dcb_state_fsm(dev, input);
		return;
	}

	/* It's weird, and almost certainly an error, to get Firmware DCB
	 * messages when we either haven't been told whether we're going to be
	 * doing Host or Firmware DCB; and even worse when we've been told
	 * that we're doing Host DCB!
	 */
	if (dcb->state == CXGB4_DCB_STATE_START ||
	    dcb->state == CXGB4_DCB_STATE_HOST) {
		dev_err(adap->pdev_dev, "Receiving Firmware DCB messages in State %d\n",
			dcb->state);
		return;
	}

	/* Now handle the general Firmware DCB update messages ...
	 */
	switch (dcb_type) {
	case FW_PORT_DCB_TYPE_PGID:
		dcb->pgid = be32_to_cpu(fwdcb->pgid.pgid);
		dcb->msgs |= CXGB4_DCB_FW_PGID;
		break;

	case FW_PORT_DCB_TYPE_PGRATE:
		dcb->pg_num_tcs_supported = fwdcb->pgrate.num_tcs_supported;
		memcpy(dcb->pgrate, &fwdcb->pgrate.pgrate,
		       sizeof(dcb->pgrate));
		memcpy(dcb->tsa, &fwdcb->pgrate.tsa,
		       sizeof(dcb->tsa));
		dcb->msgs |= CXGB4_DCB_FW_PGRATE;
		if (dcb->msgs & CXGB4_DCB_FW_PGID)
			IEEE_FAUX_SYNC(dev, dcb);
		break;

	case FW_PORT_DCB_TYPE_PRIORATE:
		memcpy(dcb->priorate, &fwdcb->priorate.strict_priorate,
		       sizeof(dcb->priorate));
		dcb->msgs |= CXGB4_DCB_FW_PRIORATE;
		break;

	case FW_PORT_DCB_TYPE_PFC:
		dcb->pfcen = fwdcb->pfc.pfcen;
		dcb->pfc_num_tcs_supported = fwdcb->pfc.max_pfc_tcs;
		dcb->msgs |= CXGB4_DCB_FW_PFC;
		IEEE_FAUX_SYNC(dev, dcb);
		break;

	case FW_PORT_DCB_TYPE_APP_ID: {
		const struct fw_port_app_priority *fwap = &fwdcb->app_priority;
		int idx = fwap->idx;
		struct app_priority *ap = &dcb->app_priority[idx];

		struct dcb_app app = {
			.protocol = be16_to_cpu(fwap->protocolid),
		};
		int err;

		/* Convert from firmware format to relevant format
		 * when using app selector
		 */
		if (dcb->dcb_version == FW_PORT_DCB_VER_IEEE) {
			app.selector = (fwap->sel_field + 1);
			app.priority = ffs(fwap->user_prio_map) - 1;
			err = dcb_ieee_setapp(dev, &app);
			IEEE_FAUX_SYNC(dev, dcb);
		} else {
			/* Default is CEE */
			app.selector = !!(fwap->sel_field);
			app.priority = fwap->user_prio_map;
			err = dcb_setapp(dev, &app);
		}

		if (err)
			dev_err(adap->pdev_dev,
				"Failed DCB Set Application Priority: sel=%d, prot=%d, prio=%d, err=%d\n",
				app.selector, app.protocol, app.priority, -err);

		ap->user_prio_map = fwap->user_prio_map;
		ap->sel_field = fwap->sel_field;
		ap->protocolid = be16_to_cpu(fwap->protocolid);
		dcb->msgs |= CXGB4_DCB_FW_APP_ID;
		break;
	}

	default:
		dev_err(adap->pdev_dev, "Unknown DCB update type received %x\n",
			dcb_type);
		break;
	}
}

/* Data Center Bridging netlink operations.
 */


/* Get current DCB enabled/disabled state.
 */
static u8 cxgb4_getstate(struct net_device *dev)
{
	struct port_info *pi = netdev2pinfo(dev);

	return pi->dcb.enabled;
}

/* Set DCB enabled/disabled.
 */
static u8 cxgb4_setstate(struct net_device *dev, u8 enabled)
{
	struct port_info *pi = netdev2pinfo(dev);

	/* If DCBx is host-managed, dcb is enabled by outside lldp agents */
	if (pi->dcb.state == CXGB4_DCB_STATE_HOST) {
		pi->dcb.enabled = enabled;
		return 0;
	}

	/* Firmware doesn't provide any mechanism to control the DCB state.
	 */
	if (enabled != (pi->dcb.state == CXGB4_DCB_STATE_FW_ALLSYNCED))
		return 1;

	return 0;
}

static void cxgb4_getpgtccfg(struct net_device *dev, int tc,
			     u8 *prio_type, u8 *pgid, u8 *bw_per,
			     u8 *up_tc_map, int local)
{
	struct fw_port_cmd pcmd;
	struct port_info *pi = netdev2pinfo(dev);
	struct adapter *adap = pi->adapter;
	int err;

	*prio_type = *pgid = *bw_per = *up_tc_map = 0;

	if (local)
		INIT_PORT_DCB_READ_LOCAL_CMD(pcmd, pi->port_id);
	else
		INIT_PORT_DCB_READ_PEER_CMD(pcmd, pi->port_id);

	pcmd.u.dcb.pgid.type = FW_PORT_DCB_TYPE_PGID;
	err = t4_wr_mbox(adap, adap->mbox, &pcmd, sizeof(pcmd), &pcmd);
	if (err != FW_PORT_DCB_CFG_SUCCESS) {
		dev_err(adap->pdev_dev, "DCB read PGID failed with %d\n", -err);
		return;
	}
	*pgid = (be32_to_cpu(pcmd.u.dcb.pgid.pgid) >> (tc * 4)) & 0xf;

	INIT_PORT_DCB_READ_PEER_CMD(pcmd, pi->port_id);
	pcmd.u.dcb.pgrate.type = FW_PORT_DCB_TYPE_PGRATE;
	err = t4_wr_mbox(adap, adap->mbox, &pcmd, sizeof(pcmd), &pcmd);
	if (err != FW_PORT_DCB_CFG_SUCCESS) {
		dev_err(adap->pdev_dev, "DCB read PGRATE failed with %d\n",
			-err);
		return;
	}

	*bw_per = pcmd.u.dcb.pgrate.pgrate[*pgid];
	*up_tc_map = (1 << tc);

	/* prio_type is link strict */
	if (*pgid != 0xF)
		*prio_type = 0x2;
}

static void cxgb4_getpgtccfg_tx(struct net_device *dev, int tc,
				u8 *prio_type, u8 *pgid, u8 *bw_per,
				u8 *up_tc_map)
{
	/* tc 0 is written at MSB position */
	return cxgb4_getpgtccfg(dev, (7 - tc), prio_type, pgid, bw_per,
				up_tc_map, 1);
}


static void cxgb4_getpgtccfg_rx(struct net_device *dev, int tc,
				u8 *prio_type, u8 *pgid, u8 *bw_per,
				u8 *up_tc_map)
{
	/* tc 0 is written at MSB position */
	return cxgb4_getpgtccfg(dev, (7 - tc), prio_type, pgid, bw_per,
				up_tc_map, 0);
}

static void cxgb4_setpgtccfg_tx(struct net_device *dev, int tc,
				u8 prio_type, u8 pgid, u8 bw_per,
				u8 up_tc_map)
{
	struct fw_port_cmd pcmd;
	struct port_info *pi = netdev2pinfo(dev);
	struct adapter *adap = pi->adapter;
	int fw_tc = 7 - tc;
	u32 _pgid;
	int err;

	if (pgid == DCB_ATTR_VALUE_UNDEFINED)
		return;
	if (bw_per == DCB_ATTR_VALUE_UNDEFINED)
		return;

	INIT_PORT_DCB_READ_LOCAL_CMD(pcmd, pi->port_id);
	pcmd.u.dcb.pgid.type = FW_PORT_DCB_TYPE_PGID;

	err = t4_wr_mbox(adap, adap->mbox, &pcmd, sizeof(pcmd), &pcmd);
	if (err != FW_PORT_DCB_CFG_SUCCESS) {
		dev_err(adap->pdev_dev, "DCB read PGID failed with %d\n", -err);
		return;
	}

	_pgid = be32_to_cpu(pcmd.u.dcb.pgid.pgid);
	_pgid &= ~(0xF << (fw_tc * 4));
	_pgid |= pgid << (fw_tc * 4);
	pcmd.u.dcb.pgid.pgid = cpu_to_be32(_pgid);

	INIT_PORT_DCB_WRITE_CMD(pcmd, pi->port_id);

	err = t4_wr_mbox(adap, adap->mbox, &pcmd, sizeof(pcmd), &pcmd);
	if (err != FW_PORT_DCB_CFG_SUCCESS) {
		dev_err(adap->pdev_dev, "DCB write PGID failed with %d\n",
			-err);
		return;
	}

	memset(&pcmd, 0, sizeof(struct fw_port_cmd));

	INIT_PORT_DCB_READ_LOCAL_CMD(pcmd, pi->port_id);
	pcmd.u.dcb.pgrate.type = FW_PORT_DCB_TYPE_PGRATE;

	err = t4_wr_mbox(adap, adap->mbox, &pcmd, sizeof(pcmd), &pcmd);
	if (err != FW_PORT_DCB_CFG_SUCCESS) {
		dev_err(adap->pdev_dev, "DCB read PGRATE failed with %d\n",
			-err);
		return;
	}

	pcmd.u.dcb.pgrate.pgrate[pgid] = bw_per;

	INIT_PORT_DCB_WRITE_CMD(pcmd, pi->port_id);
	if (pi->dcb.state == CXGB4_DCB_STATE_HOST)
		pcmd.op_to_portid |= cpu_to_be32(FW_PORT_CMD_APPLY);

	err = t4_wr_mbox(adap, adap->mbox, &pcmd, sizeof(pcmd), &pcmd);
	if (err != FW_PORT_DCB_CFG_SUCCESS)
		dev_err(adap->pdev_dev, "DCB write PGRATE failed with %d\n",
			-err);
}

static void cxgb4_getpgbwgcfg(struct net_device *dev, int pgid, u8 *bw_per,
			      int local)
{
	struct fw_port_cmd pcmd;
	struct port_info *pi = netdev2pinfo(dev);
	struct adapter *adap = pi->adapter;
	int err;

	if (local)
		INIT_PORT_DCB_READ_LOCAL_CMD(pcmd, pi->port_id);
	else
		INIT_PORT_DCB_READ_PEER_CMD(pcmd, pi->port_id);

	pcmd.u.dcb.pgrate.type = FW_PORT_DCB_TYPE_PGRATE;
	err = t4_wr_mbox(adap, adap->mbox, &pcmd, sizeof(pcmd), &pcmd);
	if (err != FW_PORT_DCB_CFG_SUCCESS) {
		dev_err(adap->pdev_dev, "DCB read PGRATE failed with %d\n",
			-err);
		return;
	}

	*bw_per = pcmd.u.dcb.pgrate.pgrate[pgid];
}

static void cxgb4_getpgbwgcfg_tx(struct net_device *dev, int pgid, u8 *bw_per)
{
	return cxgb4_getpgbwgcfg(dev, pgid, bw_per, 1);
}

static void cxgb4_getpgbwgcfg_rx(struct net_device *dev, int pgid, u8 *bw_per)
{
	return cxgb4_getpgbwgcfg(dev, pgid, bw_per, 0);
}

static void cxgb4_setpgbwgcfg_tx(struct net_device *dev, int pgid,
				 u8 bw_per)
{
	struct fw_port_cmd pcmd;
	struct port_info *pi = netdev2pinfo(dev);
	struct adapter *adap = pi->adapter;
	int err;

	INIT_PORT_DCB_READ_LOCAL_CMD(pcmd, pi->port_id);
	pcmd.u.dcb.pgrate.type = FW_PORT_DCB_TYPE_PGRATE;

	err = t4_wr_mbox(adap, adap->mbox, &pcmd, sizeof(pcmd), &pcmd);
	if (err != FW_PORT_DCB_CFG_SUCCESS) {
		dev_err(adap->pdev_dev, "DCB read PGRATE failed with %d\n",
			-err);
		return;
	}

	pcmd.u.dcb.pgrate.pgrate[pgid] = bw_per;

	INIT_PORT_DCB_WRITE_CMD(pcmd, pi->port_id);
	if (pi->dcb.state == CXGB4_DCB_STATE_HOST)
		pcmd.op_to_portid |= cpu_to_be32(FW_PORT_CMD_APPLY);

	err = t4_wr_mbox(adap, adap->mbox, &pcmd, sizeof(pcmd), &pcmd);

	if (err != FW_PORT_DCB_CFG_SUCCESS)
		dev_err(adap->pdev_dev, "DCB write PGRATE failed with %d\n",
			-err);
}

/* Return whether the specified Traffic Class Priority has Priority Pause
 * Frames enabled.
 */
static void cxgb4_getpfccfg(struct net_device *dev, int priority, u8 *pfccfg)
{
	struct port_info *pi = netdev2pinfo(dev);
	struct port_dcb_info *dcb = &pi->dcb;

	if (dcb->state != CXGB4_DCB_STATE_FW_ALLSYNCED ||
	    priority >= CXGB4_MAX_PRIORITY)
		*pfccfg = 0;
	else
		*pfccfg = (pi->dcb.pfcen >> (7 - priority)) & 1;
}

/* Enable/disable Priority Pause Frames for the specified Traffic Class
 * Priority.
 */
static void cxgb4_setpfccfg(struct net_device *dev, int priority, u8 pfccfg)
{
	struct fw_port_cmd pcmd;
	struct port_info *pi = netdev2pinfo(dev);
	struct adapter *adap = pi->adapter;
	int err;

	if (pi->dcb.state != CXGB4_DCB_STATE_FW_ALLSYNCED ||
	    priority >= CXGB4_MAX_PRIORITY)
		return;

	INIT_PORT_DCB_WRITE_CMD(pcmd, pi->port_id);
	if (pi->dcb.state == CXGB4_DCB_STATE_HOST)
		pcmd.op_to_portid |= cpu_to_be32(FW_PORT_CMD_APPLY);

	pcmd.u.dcb.pfc.type = FW_PORT_DCB_TYPE_PFC;
	pcmd.u.dcb.pfc.pfcen = pi->dcb.pfcen;

	if (pfccfg)
		pcmd.u.dcb.pfc.pfcen |= (1 << (7 - priority));
	else
		pcmd.u.dcb.pfc.pfcen &= (~(1 << (7 - priority)));

	err = t4_wr_mbox(adap, adap->mbox, &pcmd, sizeof(pcmd), &pcmd);
	if (err != FW_PORT_DCB_CFG_SUCCESS) {
		dev_err(adap->pdev_dev, "DCB PFC write failed with %d\n", -err);
		return;
	}

	pi->dcb.pfcen = pcmd.u.dcb.pfc.pfcen;
}

static u8 cxgb4_setall(struct net_device *dev)
{
	return 0;
}

/* Return DCB capabilities.
 */
static u8 cxgb4_getcap(struct net_device *dev, int cap_id, u8 *caps)
{
	struct port_info *pi = netdev2pinfo(dev);

	switch (cap_id) {
	case DCB_CAP_ATTR_PG:
	case DCB_CAP_ATTR_PFC:
		*caps = true;
		break;

	case DCB_CAP_ATTR_PG_TCS:
		/* 8 priorities for PG represented by bitmap */
		*caps = 0x80;
		break;

	case DCB_CAP_ATTR_PFC_TCS:
		/* 8 priorities for PFC represented by bitmap */
		*caps = 0x80;
		break;

	case DCB_CAP_ATTR_GSP:
		*caps = true;
		break;

	case DCB_CAP_ATTR_UP2TC:
	case DCB_CAP_ATTR_BCN:
		*caps = false;
		break;

	case DCB_CAP_ATTR_DCBX:
		*caps = pi->dcb.supported;
		break;

	default:
		*caps = false;
	}

	return 0;
}

/* Return the number of Traffic Classes for the indicated Traffic Class ID.
 */
static int cxgb4_getnumtcs(struct net_device *dev, int tcs_id, u8 *num)
{
	struct port_info *pi = netdev2pinfo(dev);

	switch (tcs_id) {
	case DCB_NUMTCS_ATTR_PG:
		if (pi->dcb.msgs & CXGB4_DCB_FW_PGRATE)
			*num = pi->dcb.pg_num_tcs_supported;
		else
			*num = 0x8;
		break;

	case DCB_NUMTCS_ATTR_PFC:
		*num = 0x8;
		break;

	default:
		return -EINVAL;
	}

	return 0;
}

/* Set the number of Traffic Classes supported for the indicated Traffic Class
 * ID.
 */
static int cxgb4_setnumtcs(struct net_device *dev, int tcs_id, u8 num)
{
	/* Setting the number of Traffic Classes isn't supported.
	 */
	return -ENOSYS;
}

/* Return whether Priority Flow Control is enabled.  */
static u8 cxgb4_getpfcstate(struct net_device *dev)
{
	struct port_info *pi = netdev2pinfo(dev);

	if (pi->dcb.state != CXGB4_DCB_STATE_FW_ALLSYNCED)
		return false;

	return pi->dcb.pfcen != 0;
}

/* Enable/disable Priority Flow Control. */
static void cxgb4_setpfcstate(struct net_device *dev, u8 state)
{
	/* We can't enable/disable Priority Flow Control but we also can't
	 * return an error ...
	 */
}

/* Return the Application User Priority Map associated with the specified
 * Application ID.
 */
static int __cxgb4_getapp(struct net_device *dev, u8 app_idtype, u16 app_id,
			  int peer)
{
	struct port_info *pi = netdev2pinfo(dev);
	struct adapter *adap = pi->adapter;
	int i;

	if (pi->dcb.state != CXGB4_DCB_STATE_FW_ALLSYNCED)
		return 0;

	for (i = 0; i < CXGB4_MAX_DCBX_APP_SUPPORTED; i++) {
		struct fw_port_cmd pcmd;
		int err;

		if (peer)
			INIT_PORT_DCB_READ_PEER_CMD(pcmd, pi->port_id);
		else
			INIT_PORT_DCB_READ_LOCAL_CMD(pcmd, pi->port_id);

		pcmd.u.dcb.app_priority.type = FW_PORT_DCB_TYPE_APP_ID;
		pcmd.u.dcb.app_priority.idx = i;

		err = t4_wr_mbox(adap, adap->mbox, &pcmd, sizeof(pcmd), &pcmd);
		if (err != FW_PORT_DCB_CFG_SUCCESS) {
			dev_err(adap->pdev_dev, "DCB APP read failed with %d\n",
				-err);
			return err;
		}
		if (be16_to_cpu(pcmd.u.dcb.app_priority.protocolid) == app_id)
			if (pcmd.u.dcb.app_priority.sel_field == app_idtype)
				return pcmd.u.dcb.app_priority.user_prio_map;

		/* exhausted app list */
		if (!pcmd.u.dcb.app_priority.protocolid)
			break;
	}

	return -EEXIST;
}

/* Return the Application User Priority Map associated with the specified
 * Application ID.
 */
static int cxgb4_getapp(struct net_device *dev, u8 app_idtype, u16 app_id)
{
	return __cxgb4_getapp(dev, app_idtype, app_id, 0);
}

/* Write a new Application User Priority Map for the specified Application ID
 */
static int __cxgb4_setapp(struct net_device *dev, u8 app_idtype, u16 app_id,
			  u8 app_prio)
{
	struct fw_port_cmd pcmd;
	struct port_info *pi = netdev2pinfo(dev);
	struct adapter *adap = pi->adapter;
	int i, err;


	if (pi->dcb.state != CXGB4_DCB_STATE_FW_ALLSYNCED)
		return -EINVAL;

	/* DCB info gets thrown away on link up */
	if (!netif_carrier_ok(dev))
		return -ENOLINK;

	for (i = 0; i < CXGB4_MAX_DCBX_APP_SUPPORTED; i++) {
		INIT_PORT_DCB_READ_LOCAL_CMD(pcmd, pi->port_id);
		pcmd.u.dcb.app_priority.type = FW_PORT_DCB_TYPE_APP_ID;
		pcmd.u.dcb.app_priority.idx = i;
		err = t4_wr_mbox(adap, adap->mbox, &pcmd, sizeof(pcmd), &pcmd);

		if (err != FW_PORT_DCB_CFG_SUCCESS) {
			dev_err(adap->pdev_dev, "DCB app table read failed with %d\n",
				-err);
			return err;
		}
		if (be16_to_cpu(pcmd.u.dcb.app_priority.protocolid) == app_id) {
			/* overwrite existing app table */
			pcmd.u.dcb.app_priority.protocolid = 0;
			break;
		}
		/* find first empty slot */
		if (!pcmd.u.dcb.app_priority.protocolid)
			break;
	}

	if (i == CXGB4_MAX_DCBX_APP_SUPPORTED) {
		/* no empty slots available */
		dev_err(adap->pdev_dev, "DCB app table full\n");
		return -EBUSY;
	}

	/* write out new app table entry */
	INIT_PORT_DCB_WRITE_CMD(pcmd, pi->port_id);
	if (pi->dcb.state == CXGB4_DCB_STATE_HOST)
		pcmd.op_to_portid |= cpu_to_be32(FW_PORT_CMD_APPLY);

	pcmd.u.dcb.app_priority.type = FW_PORT_DCB_TYPE_APP_ID;
	pcmd.u.dcb.app_priority.protocolid = cpu_to_be16(app_id);
	pcmd.u.dcb.app_priority.sel_field = app_idtype;
	pcmd.u.dcb.app_priority.user_prio_map = app_prio;
	pcmd.u.dcb.app_priority.idx = i;

	err = t4_wr_mbox(adap, adap->mbox, &pcmd, sizeof(pcmd), &pcmd);
	if (err != FW_PORT_DCB_CFG_SUCCESS) {
		dev_err(adap->pdev_dev, "DCB app table write failed with %d\n",
			-err);
		return err;
	}

	return 0;
}

/* Priority for CEE inside dcb_app is bitmask, with 0 being an invalid value */
static int cxgb4_setapp(struct net_device *dev, u8 app_idtype, u16 app_id,
			u8 app_prio)
{
	int ret;
	struct dcb_app app = {
		.selector = app_idtype,
		.protocol = app_id,
		.priority = app_prio,
	};

	if (app_idtype != DCB_APP_IDTYPE_ETHTYPE &&
	    app_idtype != DCB_APP_IDTYPE_PORTNUM)
		return -EINVAL;

	/* Convert app_idtype to a format that firmware understands */
	ret = __cxgb4_setapp(dev, app_idtype == DCB_APP_IDTYPE_ETHTYPE ?
			      app_idtype : 3, app_id, app_prio);
	if (ret)
		return ret;

	return dcb_setapp(dev, &app);
}

/* Return whether IEEE Data Center Bridging has been negotiated.
 */
static inline int
cxgb4_ieee_negotiation_complete(struct net_device *dev,
				enum cxgb4_dcb_fw_msgs dcb_subtype)
{
	struct port_info *pi = netdev2pinfo(dev);
	struct port_dcb_info *dcb = &pi->dcb;

	if (dcb_subtype && !(dcb->msgs & dcb_subtype))
		return 0;

	return (dcb->state == CXGB4_DCB_STATE_FW_ALLSYNCED &&
		(dcb->supported & DCB_CAP_DCBX_VER_IEEE));
}

/* Fill in the Application User Priority Map associated with the
 * specified Application.
 * Priority for IEEE dcb_app is an integer, with 0 being a valid value
 */
static int cxgb4_ieee_getapp(struct net_device *dev, struct dcb_app *app)
{
	int prio;

	if (!cxgb4_ieee_negotiation_complete(dev, CXGB4_DCB_FW_APP_ID))
		return -EINVAL;
	if (!(app->selector && app->protocol))
		return -EINVAL;

	/* Try querying firmware first, use firmware format */
	prio = __cxgb4_getapp(dev, app->selector - 1, app->protocol, 0);

	if (prio < 0)
		prio = dcb_ieee_getapp_mask(dev, app);

	app->priority = ffs(prio) - 1;
	return 0;
}

/* Write a new Application User Priority Map for the specified Application ID.
 * Priority for IEEE dcb_app is an integer, with 0 being a valid value
 */
static int cxgb4_ieee_setapp(struct net_device *dev, struct dcb_app *app)
{
	int ret;

	if (!cxgb4_ieee_negotiation_complete(dev, CXGB4_DCB_FW_APP_ID))
		return -EINVAL;
	if (!(app->selector && app->protocol))
		return -EINVAL;

	if (!(app->selector > IEEE_8021QAZ_APP_SEL_ETHERTYPE  &&
	      app->selector < IEEE_8021QAZ_APP_SEL_ANY))
		return -EINVAL;

	/* change selector to a format that firmware understands */
	ret = __cxgb4_setapp(dev, app->selector - 1, app->protocol,
			     (1 << app->priority));
	if (ret)
		return ret;

	return dcb_ieee_setapp(dev, app);
}

/* Return our DCBX parameters.
 */
static u8 cxgb4_getdcbx(struct net_device *dev)
{
	struct port_info *pi = netdev2pinfo(dev);

	/* This is already set by cxgb4_set_dcb_caps, so just return it */
	return pi->dcb.supported;
}

/* Set our DCBX parameters.
 */
static u8 cxgb4_setdcbx(struct net_device *dev, u8 dcb_request)
{
	struct port_info *pi = netdev2pinfo(dev);

	/* Filter out requests which exceed our capabilities.
	 */
	if ((dcb_request & (CXGB4_DCBX_FW_SUPPORT | CXGB4_DCBX_HOST_SUPPORT))
	    != dcb_request)
		return 1;

	/* Can't enable DCB if we haven't successfully negotiated it.
	 */
	if (pi->dcb.state != CXGB4_DCB_STATE_FW_ALLSYNCED)
		return 1;

	/* There's currently no mechanism to allow for the firmware DCBX
	 * negotiation to be changed from the Host Driver.  If the caller
	 * requests exactly the same parameters that we already have then
	 * we'll allow them to be successfully "set" ...
	 */
	if (dcb_request != pi->dcb.supported)
		return 1;

	pi->dcb.supported = dcb_request;
	return 0;
}

static int cxgb4_getpeer_app(struct net_device *dev,
			     struct dcb_peer_app_info *info, u16 *app_count)
{
	struct fw_port_cmd pcmd;
	struct port_info *pi = netdev2pinfo(dev);
	struct adapter *adap = pi->adapter;
	int i, err = 0;

	if (pi->dcb.state != CXGB4_DCB_STATE_FW_ALLSYNCED)
		return 1;

	info->willing = 0;
	info->error = 0;

	*app_count = 0;
	for (i = 0; i < CXGB4_MAX_DCBX_APP_SUPPORTED; i++) {
		INIT_PORT_DCB_READ_PEER_CMD(pcmd, pi->port_id);
		pcmd.u.dcb.app_priority.type = FW_PORT_DCB_TYPE_APP_ID;
		pcmd.u.dcb.app_priority.idx = *app_count;
		err = t4_wr_mbox(adap, adap->mbox, &pcmd, sizeof(pcmd), &pcmd);

		if (err != FW_PORT_DCB_CFG_SUCCESS) {
			dev_err(adap->pdev_dev, "DCB app table read failed with %d\n",
				-err);
			return err;
		}

		/* find first empty slot */
		if (!pcmd.u.dcb.app_priority.protocolid)
			break;
	}
	*app_count = i;
	return err;
}

static int cxgb4_getpeerapp_tbl(struct net_device *dev, struct dcb_app *table)
{
	struct fw_port_cmd pcmd;
	struct port_info *pi = netdev2pinfo(dev);
	struct adapter *adap = pi->adapter;
	int i, err = 0;

	if (pi->dcb.state != CXGB4_DCB_STATE_FW_ALLSYNCED)
		return 1;

	for (i = 0; i < CXGB4_MAX_DCBX_APP_SUPPORTED; i++) {
		INIT_PORT_DCB_READ_PEER_CMD(pcmd, pi->port_id);
		pcmd.u.dcb.app_priority.type = FW_PORT_DCB_TYPE_APP_ID;
		pcmd.u.dcb.app_priority.idx = i;
		err = t4_wr_mbox(adap, adap->mbox, &pcmd, sizeof(pcmd), &pcmd);

		if (err != FW_PORT_DCB_CFG_SUCCESS) {
			dev_err(adap->pdev_dev, "DCB app table read failed with %d\n",
				-err);
			return err;
		}

		/* find first empty slot */
		if (!pcmd.u.dcb.app_priority.protocolid)
			break;

		table[i].selector = pcmd.u.dcb.app_priority.sel_field;
		table[i].protocol =
			be16_to_cpu(pcmd.u.dcb.app_priority.protocolid);
		table[i].priority =
			ffs(pcmd.u.dcb.app_priority.user_prio_map) - 1;
	}
	return err;
}

/* Return Priority Group information.
 */
static int cxgb4_cee_peer_getpg(struct net_device *dev, struct cee_pg *pg)
{
	struct fw_port_cmd pcmd;
	struct port_info *pi = netdev2pinfo(dev);
	struct adapter *adap = pi->adapter;
	u32 pgid;
	int i, err;

	/* We're always "willing" -- the Switch Fabric always dictates the
	 * DCBX parameters to us.
	 */
	pg->willing = true;

	INIT_PORT_DCB_READ_PEER_CMD(pcmd, pi->port_id);
	pcmd.u.dcb.pgid.type = FW_PORT_DCB_TYPE_PGID;
	err = t4_wr_mbox(adap, adap->mbox, &pcmd, sizeof(pcmd), &pcmd);
	if (err != FW_PORT_DCB_CFG_SUCCESS) {
		dev_err(adap->pdev_dev, "DCB read PGID failed with %d\n", -err);
		return err;
	}
	pgid = be32_to_cpu(pcmd.u.dcb.pgid.pgid);

	for (i = 0; i < CXGB4_MAX_PRIORITY; i++)
		pg->prio_pg[7 - i] = (pgid >> (i * 4)) & 0xF;

	INIT_PORT_DCB_READ_PEER_CMD(pcmd, pi->port_id);
	pcmd.u.dcb.pgrate.type = FW_PORT_DCB_TYPE_PGRATE;
	err = t4_wr_mbox(adap, adap->mbox, &pcmd, sizeof(pcmd), &pcmd);
	if (err != FW_PORT_DCB_CFG_SUCCESS) {
		dev_err(adap->pdev_dev, "DCB read PGRATE failed with %d\n",
			-err);
		return err;
	}

	for (i = 0; i < CXGB4_MAX_PRIORITY; i++)
		pg->pg_bw[i] = pcmd.u.dcb.pgrate.pgrate[i];

	return 0;
}

/* Return Priority Flow Control information.
 */
static int cxgb4_cee_peer_getpfc(struct net_device *dev, struct cee_pfc *pfc)
{
	struct port_info *pi = netdev2pinfo(dev);

	cxgb4_getnumtcs(dev, DCB_NUMTCS_ATTR_PFC, &(pfc->tcs_supported));
	pfc->pfc_en = pi->dcb.pfcen;

	return 0;
}

const struct dcbnl_rtnl_ops cxgb4_dcb_ops = {
	.ieee_getapp		= cxgb4_ieee_getapp,
	.ieee_setapp		= cxgb4_ieee_setapp,

	/* CEE std */
	.getstate		= cxgb4_getstate,
	.setstate		= cxgb4_setstate,
	.getpgtccfgtx		= cxgb4_getpgtccfg_tx,
	.getpgbwgcfgtx		= cxgb4_getpgbwgcfg_tx,
	.getpgtccfgrx		= cxgb4_getpgtccfg_rx,
	.getpgbwgcfgrx		= cxgb4_getpgbwgcfg_rx,
	.setpgtccfgtx		= cxgb4_setpgtccfg_tx,
	.setpgbwgcfgtx		= cxgb4_setpgbwgcfg_tx,
	.setpfccfg		= cxgb4_setpfccfg,
	.getpfccfg		= cxgb4_getpfccfg,
	.setall			= cxgb4_setall,
	.getcap			= cxgb4_getcap,
	.getnumtcs		= cxgb4_getnumtcs,
	.setnumtcs		= cxgb4_setnumtcs,
	.getpfcstate		= cxgb4_getpfcstate,
	.setpfcstate		= cxgb4_setpfcstate,
	.getapp			= cxgb4_getapp,
	.setapp			= cxgb4_setapp,

	/* DCBX configuration */
	.getdcbx		= cxgb4_getdcbx,
	.setdcbx		= cxgb4_setdcbx,

	/* peer apps */
	.peer_getappinfo	= cxgb4_getpeer_app,
	.peer_getapptable	= cxgb4_getpeerapp_tbl,

	/* CEE peer */
	.cee_peer_getpg		= cxgb4_cee_peer_getpg,
	.cee_peer_getpfc	= cxgb4_cee_peer_getpfc,
};
OpenPOWER on IntegriCloud