summaryrefslogtreecommitdiffstats
path: root/drivers/vdpa/ifcvf/ifcvf_main.c
blob: d5036f49f161ae1feaad2b7e9bf31fb28a0023b3 (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Intel IFC VF NIC driver for virtio dataplane offloading
 *
 * Copyright (C) 2020 Intel Corporation.
 *
 * Author: Zhu Lingshan <lingshan.zhu@intel.com>
 *
 */

#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/sysfs.h>
#include "ifcvf_base.h"

#define DRIVER_AUTHOR   "Intel Corporation"
#define IFCVF_DRIVER_NAME       "ifcvf"

static irqreturn_t ifcvf_config_changed(int irq, void *arg)
{
	struct ifcvf_hw *vf = arg;

	if (vf->config_cb.callback)
		return vf->config_cb.callback(vf->config_cb.private);

	return IRQ_HANDLED;
}

static irqreturn_t ifcvf_vq_intr_handler(int irq, void *arg)
{
	struct vring_info *vring = arg;

	if (vring->cb.callback)
		return vring->cb.callback(vring->cb.private);

	return IRQ_HANDLED;
}

static irqreturn_t ifcvf_vqs_reused_intr_handler(int irq, void *arg)
{
	struct ifcvf_hw *vf = arg;
	struct vring_info *vring;
	int i;

	for (i = 0; i < vf->nr_vring; i++) {
		vring = &vf->vring[i];
		if (vring->cb.callback)
			vring->cb.callback(vring->cb.private);
	}

	return IRQ_HANDLED;
}

static irqreturn_t ifcvf_dev_intr_handler(int irq, void *arg)
{
	struct ifcvf_hw *vf = arg;
	u8 isr;

	isr = vp_ioread8(vf->isr);
	if (isr & VIRTIO_PCI_ISR_CONFIG)
		ifcvf_config_changed(irq, arg);

	return ifcvf_vqs_reused_intr_handler(irq, arg);
}

static void ifcvf_free_irq_vectors(void *data)
{
	pci_free_irq_vectors(data);
}

static void ifcvf_free_per_vq_irq(struct ifcvf_hw *vf)
{
	struct pci_dev *pdev = vf->pdev;
	int i;

	for (i = 0; i < vf->nr_vring; i++) {
		if (vf->vring[i].irq != -EINVAL) {
			devm_free_irq(&pdev->dev, vf->vring[i].irq, &vf->vring[i]);
			vf->vring[i].irq = -EINVAL;
		}
	}
}

static void ifcvf_free_vqs_reused_irq(struct ifcvf_hw *vf)
{
	struct pci_dev *pdev = vf->pdev;

	if (vf->vqs_reused_irq != -EINVAL) {
		devm_free_irq(&pdev->dev, vf->vqs_reused_irq, vf);
		vf->vqs_reused_irq = -EINVAL;
	}

}

static void ifcvf_free_vq_irq(struct ifcvf_hw *vf)
{
	if (vf->msix_vector_status == MSIX_VECTOR_PER_VQ_AND_CONFIG)
		ifcvf_free_per_vq_irq(vf);
	else
		ifcvf_free_vqs_reused_irq(vf);
}

static void ifcvf_free_config_irq(struct ifcvf_hw *vf)
{
	struct pci_dev *pdev = vf->pdev;

	if (vf->config_irq == -EINVAL)
		return;

	/* If the irq is shared by all vqs and the config interrupt,
	 * it is already freed in ifcvf_free_vq_irq, so here only
	 * need to free config irq when msix_vector_status != MSIX_VECTOR_DEV_SHARED
	 */
	if (vf->msix_vector_status != MSIX_VECTOR_DEV_SHARED) {
		devm_free_irq(&pdev->dev, vf->config_irq, vf);
		vf->config_irq = -EINVAL;
	}
}

static void ifcvf_free_irq(struct ifcvf_hw *vf)
{
	struct pci_dev *pdev = vf->pdev;

	ifcvf_free_vq_irq(vf);
	ifcvf_free_config_irq(vf);
	ifcvf_free_irq_vectors(pdev);
}

/* ifcvf MSIX vectors allocator, this helper tries to allocate
 * vectors for all virtqueues and the config interrupt.
 * It returns the number of allocated vectors, negative
 * return value when fails.
 */
static int ifcvf_alloc_vectors(struct ifcvf_hw *vf)
{
	struct pci_dev *pdev = vf->pdev;
	int max_intr, ret;

	/* all queues and config interrupt  */
	max_intr = vf->nr_vring + 1;
	ret = pci_alloc_irq_vectors(pdev, 1, max_intr, PCI_IRQ_MSIX | PCI_IRQ_AFFINITY);

	if (ret < 0) {
		IFCVF_ERR(pdev, "Failed to alloc IRQ vectors\n");
		return ret;
	}

	if (ret < max_intr)
		IFCVF_INFO(pdev,
			   "Requested %u vectors, however only %u allocated, lower performance\n",
			   max_intr, ret);

	return ret;
}

static int ifcvf_request_per_vq_irq(struct ifcvf_hw *vf)
{
	struct pci_dev *pdev = vf->pdev;
	int i, vector, ret, irq;

	vf->vqs_reused_irq = -EINVAL;
	for (i = 0; i < vf->nr_vring; i++) {
		snprintf(vf->vring[i].msix_name, 256, "ifcvf[%s]-%d\n", pci_name(pdev), i);
		vector = i;
		irq = pci_irq_vector(pdev, vector);
		ret = devm_request_irq(&pdev->dev, irq,
				       ifcvf_vq_intr_handler, 0,
				       vf->vring[i].msix_name,
				       &vf->vring[i]);
		if (ret) {
			IFCVF_ERR(pdev, "Failed to request irq for vq %d\n", i);
			goto err;
		}

		vf->vring[i].irq = irq;
		ret = ifcvf_set_vq_vector(vf, i, vector);
		if (ret == VIRTIO_MSI_NO_VECTOR) {
			IFCVF_ERR(pdev, "No msix vector for vq %u\n", i);
			goto err;
		}
	}

	return 0;
err:
	ifcvf_free_irq(vf);

	return -EFAULT;
}

static int ifcvf_request_vqs_reused_irq(struct ifcvf_hw *vf)
{
	struct pci_dev *pdev = vf->pdev;
	int i, vector, ret, irq;

	vector = 0;
	snprintf(vf->vring[0].msix_name, 256, "ifcvf[%s]-vqs-reused-irq\n", pci_name(pdev));
	irq = pci_irq_vector(pdev, vector);
	ret = devm_request_irq(&pdev->dev, irq,
			       ifcvf_vqs_reused_intr_handler, 0,
			       vf->vring[0].msix_name, vf);
	if (ret) {
		IFCVF_ERR(pdev, "Failed to request reused irq for the device\n");
		goto err;
	}

	vf->vqs_reused_irq = irq;
	for (i = 0; i < vf->nr_vring; i++) {
		vf->vring[i].irq = -EINVAL;
		ret = ifcvf_set_vq_vector(vf, i, vector);
		if (ret == VIRTIO_MSI_NO_VECTOR) {
			IFCVF_ERR(pdev, "No msix vector for vq %u\n", i);
			goto err;
		}
	}

	return 0;
err:
	ifcvf_free_irq(vf);

	return -EFAULT;
}

static int ifcvf_request_dev_irq(struct ifcvf_hw *vf)
{
	struct pci_dev *pdev = vf->pdev;
	int i, vector, ret, irq;

	vector = 0;
	snprintf(vf->vring[0].msix_name, 256, "ifcvf[%s]-dev-irq\n", pci_name(pdev));
	irq = pci_irq_vector(pdev, vector);
	ret = devm_request_irq(&pdev->dev, irq,
			       ifcvf_dev_intr_handler, 0,
			       vf->vring[0].msix_name, vf);
	if (ret) {
		IFCVF_ERR(pdev, "Failed to request irq for the device\n");
		goto err;
	}

	vf->vqs_reused_irq = irq;
	for (i = 0; i < vf->nr_vring; i++) {
		vf->vring[i].irq = -EINVAL;
		ret = ifcvf_set_vq_vector(vf, i, vector);
		if (ret == VIRTIO_MSI_NO_VECTOR) {
			IFCVF_ERR(pdev, "No msix vector for vq %u\n", i);
			goto err;
		}
	}

	vf->config_irq = irq;
	ret = ifcvf_set_config_vector(vf, vector);
	if (ret == VIRTIO_MSI_NO_VECTOR) {
		IFCVF_ERR(pdev, "No msix vector for device config\n");
		goto err;
	}

	return 0;
err:
	ifcvf_free_irq(vf);

	return -EFAULT;

}

static int ifcvf_request_vq_irq(struct ifcvf_hw *vf)
{
	int ret;

	if (vf->msix_vector_status == MSIX_VECTOR_PER_VQ_AND_CONFIG)
		ret = ifcvf_request_per_vq_irq(vf);
	else
		ret = ifcvf_request_vqs_reused_irq(vf);

	return ret;
}

static int ifcvf_request_config_irq(struct ifcvf_hw *vf)
{
	struct pci_dev *pdev = vf->pdev;
	int config_vector, ret;

	if (vf->msix_vector_status == MSIX_VECTOR_PER_VQ_AND_CONFIG)
		config_vector = vf->nr_vring;
	else if (vf->msix_vector_status ==  MSIX_VECTOR_SHARED_VQ_AND_CONFIG)
		/* vector 0 for vqs and 1 for config interrupt */
		config_vector = 1;
	else if (vf->msix_vector_status == MSIX_VECTOR_DEV_SHARED)
		/* re-use the vqs vector */
		return 0;
	else
		return -EINVAL;

	snprintf(vf->config_msix_name, 256, "ifcvf[%s]-config\n",
		 pci_name(pdev));
	vf->config_irq = pci_irq_vector(pdev, config_vector);
	ret = devm_request_irq(&pdev->dev, vf->config_irq,
			       ifcvf_config_changed, 0,
			       vf->config_msix_name, vf);
	if (ret) {
		IFCVF_ERR(pdev, "Failed to request config irq\n");
		goto err;
	}

	ret = ifcvf_set_config_vector(vf, config_vector);
	if (ret == VIRTIO_MSI_NO_VECTOR) {
		IFCVF_ERR(pdev, "No msix vector for device config\n");
		goto err;
	}

	return 0;
err:
	ifcvf_free_irq(vf);

	return -EFAULT;
}

static int ifcvf_request_irq(struct ifcvf_hw *vf)
{
	int nvectors, ret, max_intr;

	nvectors = ifcvf_alloc_vectors(vf);
	if (nvectors <= 0)
		return -EFAULT;

	vf->msix_vector_status = MSIX_VECTOR_PER_VQ_AND_CONFIG;
	max_intr = vf->nr_vring + 1;
	if (nvectors < max_intr)
		vf->msix_vector_status = MSIX_VECTOR_SHARED_VQ_AND_CONFIG;

	if (nvectors == 1) {
		vf->msix_vector_status = MSIX_VECTOR_DEV_SHARED;
		ret = ifcvf_request_dev_irq(vf);

		return ret;
	}

	ret = ifcvf_request_vq_irq(vf);
	if (ret)
		return ret;

	ret = ifcvf_request_config_irq(vf);

	if (ret)
		return ret;

	return 0;
}

static int ifcvf_start_datapath(void *private)
{
	struct ifcvf_hw *vf = ifcvf_private_to_vf(private);
	u8 status;
	int ret;

	ret = ifcvf_start_hw(vf);
	if (ret < 0) {
		status = ifcvf_get_status(vf);
		status |= VIRTIO_CONFIG_S_FAILED;
		ifcvf_set_status(vf, status);
	}

	return ret;
}

static int ifcvf_stop_datapath(void *private)
{
	struct ifcvf_hw *vf = ifcvf_private_to_vf(private);
	int i;

	for (i = 0; i < vf->nr_vring; i++)
		vf->vring[i].cb.callback = NULL;

	ifcvf_stop_hw(vf);

	return 0;
}

static void ifcvf_reset_vring(struct ifcvf_adapter *adapter)
{
	struct ifcvf_hw *vf = ifcvf_private_to_vf(adapter);
	int i;

	for (i = 0; i < vf->nr_vring; i++) {
		vf->vring[i].last_avail_idx = 0;
		vf->vring[i].desc = 0;
		vf->vring[i].avail = 0;
		vf->vring[i].used = 0;
		vf->vring[i].ready = 0;
		vf->vring[i].cb.callback = NULL;
		vf->vring[i].cb.private = NULL;
	}

	ifcvf_reset(vf);
}

static struct ifcvf_adapter *vdpa_to_adapter(struct vdpa_device *vdpa_dev)
{
	return container_of(vdpa_dev, struct ifcvf_adapter, vdpa);
}

static struct ifcvf_hw *vdpa_to_vf(struct vdpa_device *vdpa_dev)
{
	struct ifcvf_adapter *adapter = vdpa_to_adapter(vdpa_dev);

	return adapter->vf;
}

static u64 ifcvf_vdpa_get_device_features(struct vdpa_device *vdpa_dev)
{
	struct ifcvf_adapter *adapter = vdpa_to_adapter(vdpa_dev);
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
	struct pci_dev *pdev = adapter->pdev;
	u32 type = vf->dev_type;
	u64 features;

	if (type == VIRTIO_ID_NET || type == VIRTIO_ID_BLOCK)
		features = ifcvf_get_features(vf);
	else {
		features = 0;
		IFCVF_ERR(pdev, "VIRTIO ID %u not supported\n", vf->dev_type);
	}

	return features;
}

static int ifcvf_vdpa_set_driver_features(struct vdpa_device *vdpa_dev, u64 features)
{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
	int ret;

	ret = ifcvf_verify_min_features(vf, features);
	if (ret)
		return ret;

	vf->req_features = features;

	return 0;
}

static u64 ifcvf_vdpa_get_driver_features(struct vdpa_device *vdpa_dev)
{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	return vf->req_features;
}

static u8 ifcvf_vdpa_get_status(struct vdpa_device *vdpa_dev)
{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	return ifcvf_get_status(vf);
}

static void ifcvf_vdpa_set_status(struct vdpa_device *vdpa_dev, u8 status)
{
	struct ifcvf_adapter *adapter;
	struct ifcvf_hw *vf;
	u8 status_old;
	int ret;

	vf  = vdpa_to_vf(vdpa_dev);
	adapter = vdpa_to_adapter(vdpa_dev);
	status_old = ifcvf_get_status(vf);

	if (status_old == status)
		return;

	if ((status & VIRTIO_CONFIG_S_DRIVER_OK) &&
	    !(status_old & VIRTIO_CONFIG_S_DRIVER_OK)) {
		ret = ifcvf_request_irq(vf);
		if (ret) {
			status = ifcvf_get_status(vf);
			status |= VIRTIO_CONFIG_S_FAILED;
			ifcvf_set_status(vf, status);
			return;
		}

		if (ifcvf_start_datapath(adapter) < 0)
			IFCVF_ERR(adapter->pdev,
				  "Failed to set ifcvf vdpa  status %u\n",
				  status);
	}

	ifcvf_set_status(vf, status);
}

static int ifcvf_vdpa_reset(struct vdpa_device *vdpa_dev)
{
	struct ifcvf_adapter *adapter;
	struct ifcvf_hw *vf;
	u8 status_old;

	vf  = vdpa_to_vf(vdpa_dev);
	adapter = vdpa_to_adapter(vdpa_dev);
	status_old = ifcvf_get_status(vf);

	if (status_old == 0)
		return 0;

	if (status_old & VIRTIO_CONFIG_S_DRIVER_OK) {
		ifcvf_stop_datapath(adapter);
		ifcvf_free_irq(vf);
	}

	ifcvf_reset_vring(adapter);

	return 0;
}

static u16 ifcvf_vdpa_get_vq_num_max(struct vdpa_device *vdpa_dev)
{
	return IFCVF_QUEUE_MAX;
}

static int ifcvf_vdpa_get_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
				   struct vdpa_vq_state *state)
{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	state->split.avail_index = ifcvf_get_vq_state(vf, qid);
	return 0;
}

static int ifcvf_vdpa_set_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
				   const struct vdpa_vq_state *state)
{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	return ifcvf_set_vq_state(vf, qid, state->split.avail_index);
}

static void ifcvf_vdpa_set_vq_cb(struct vdpa_device *vdpa_dev, u16 qid,
				 struct vdpa_callback *cb)
{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	vf->vring[qid].cb = *cb;
}

static void ifcvf_vdpa_set_vq_ready(struct vdpa_device *vdpa_dev,
				    u16 qid, bool ready)
{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	vf->vring[qid].ready = ready;
}

static bool ifcvf_vdpa_get_vq_ready(struct vdpa_device *vdpa_dev, u16 qid)
{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	return vf->vring[qid].ready;
}

static void ifcvf_vdpa_set_vq_num(struct vdpa_device *vdpa_dev, u16 qid,
				  u32 num)
{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	vf->vring[qid].size = num;
}

static int ifcvf_vdpa_set_vq_address(struct vdpa_device *vdpa_dev, u16 qid,
				     u64 desc_area, u64 driver_area,
				     u64 device_area)
{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	vf->vring[qid].desc = desc_area;
	vf->vring[qid].avail = driver_area;
	vf->vring[qid].used = device_area;

	return 0;
}

static void ifcvf_vdpa_kick_vq(struct vdpa_device *vdpa_dev, u16 qid)
{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	ifcvf_notify_queue(vf, qid);
}

static u32 ifcvf_vdpa_get_generation(struct vdpa_device *vdpa_dev)
{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	return vp_ioread8(&vf->common_cfg->config_generation);
}

static u32 ifcvf_vdpa_get_device_id(struct vdpa_device *vdpa_dev)
{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	return vf->dev_type;
}

static u32 ifcvf_vdpa_get_vendor_id(struct vdpa_device *vdpa_dev)
{
	struct ifcvf_adapter *adapter = vdpa_to_adapter(vdpa_dev);
	struct pci_dev *pdev = adapter->pdev;

	return pdev->subsystem_vendor;
}

static u32 ifcvf_vdpa_get_vq_align(struct vdpa_device *vdpa_dev)
{
	return IFCVF_QUEUE_ALIGNMENT;
}

static size_t ifcvf_vdpa_get_config_size(struct vdpa_device *vdpa_dev)
{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	return  vf->config_size;
}

static u32 ifcvf_vdpa_get_vq_group(struct vdpa_device *vdpa, u16 idx)
{
	return 0;
}

static void ifcvf_vdpa_get_config(struct vdpa_device *vdpa_dev,
				  unsigned int offset,
				  void *buf, unsigned int len)
{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	ifcvf_read_dev_config(vf, offset, buf, len);
}

static void ifcvf_vdpa_set_config(struct vdpa_device *vdpa_dev,
				  unsigned int offset, const void *buf,
				  unsigned int len)
{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	ifcvf_write_dev_config(vf, offset, buf, len);
}

static void ifcvf_vdpa_set_config_cb(struct vdpa_device *vdpa_dev,
				     struct vdpa_callback *cb)
{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	vf->config_cb.callback = cb->callback;
	vf->config_cb.private = cb->private;
}

static int ifcvf_vdpa_get_vq_irq(struct vdpa_device *vdpa_dev,
				 u16 qid)
{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	if (vf->vqs_reused_irq < 0)
		return vf->vring[qid].irq;
	else
		return -EINVAL;
}

static struct vdpa_notification_area ifcvf_get_vq_notification(struct vdpa_device *vdpa_dev,
							       u16 idx)
{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
	struct vdpa_notification_area area;

	area.addr = vf->vring[idx].notify_pa;
	if (!vf->notify_off_multiplier)
		area.size = PAGE_SIZE;
	else
		area.size = vf->notify_off_multiplier;

	return area;
}

/*
 * IFCVF currently doesn't have on-chip IOMMU, so not
 * implemented set_map()/dma_map()/dma_unmap()
 */
static const struct vdpa_config_ops ifc_vdpa_ops = {
	.get_device_features = ifcvf_vdpa_get_device_features,
	.set_driver_features = ifcvf_vdpa_set_driver_features,
	.get_driver_features = ifcvf_vdpa_get_driver_features,
	.get_status	= ifcvf_vdpa_get_status,
	.set_status	= ifcvf_vdpa_set_status,
	.reset		= ifcvf_vdpa_reset,
	.get_vq_num_max	= ifcvf_vdpa_get_vq_num_max,
	.get_vq_state	= ifcvf_vdpa_get_vq_state,
	.set_vq_state	= ifcvf_vdpa_set_vq_state,
	.set_vq_cb	= ifcvf_vdpa_set_vq_cb,
	.set_vq_ready	= ifcvf_vdpa_set_vq_ready,
	.get_vq_ready	= ifcvf_vdpa_get_vq_ready,
	.set_vq_num	= ifcvf_vdpa_set_vq_num,
	.set_vq_address	= ifcvf_vdpa_set_vq_address,
	.get_vq_irq	= ifcvf_vdpa_get_vq_irq,
	.kick_vq	= ifcvf_vdpa_kick_vq,
	.get_generation	= ifcvf_vdpa_get_generation,
	.get_device_id	= ifcvf_vdpa_get_device_id,
	.get_vendor_id	= ifcvf_vdpa_get_vendor_id,
	.get_vq_align	= ifcvf_vdpa_get_vq_align,
	.get_vq_group	= ifcvf_vdpa_get_vq_group,
	.get_config_size	= ifcvf_vdpa_get_config_size,
	.get_config	= ifcvf_vdpa_get_config,
	.set_config	= ifcvf_vdpa_set_config,
	.set_config_cb  = ifcvf_vdpa_set_config_cb,
	.get_vq_notification = ifcvf_get_vq_notification,
};

static struct virtio_device_id id_table_net[] = {
	{VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID},
	{0},
};

static struct virtio_device_id id_table_blk[] = {
	{VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID},
	{0},
};

static u32 get_dev_type(struct pci_dev *pdev)
{
	u32 dev_type;

	/* This drirver drives both modern virtio devices and transitional
	 * devices in modern mode.
	 * vDPA requires feature bit VIRTIO_F_ACCESS_PLATFORM,
	 * so legacy devices and transitional devices in legacy
	 * mode will not work for vDPA, this driver will not
	 * drive devices with legacy interface.
	 */

	if (pdev->device < 0x1040)
		dev_type =  pdev->subsystem_device;
	else
		dev_type =  pdev->device - 0x1040;

	return dev_type;
}

static int ifcvf_vdpa_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
			      const struct vdpa_dev_set_config *config)
{
	struct ifcvf_vdpa_mgmt_dev *ifcvf_mgmt_dev;
	struct ifcvf_adapter *adapter;
	struct vdpa_device *vdpa_dev;
	struct pci_dev *pdev;
	struct ifcvf_hw *vf;
	int ret;

	ifcvf_mgmt_dev = container_of(mdev, struct ifcvf_vdpa_mgmt_dev, mdev);
	vf = &ifcvf_mgmt_dev->vf;
	pdev = vf->pdev;
	adapter = vdpa_alloc_device(struct ifcvf_adapter, vdpa,
				    &pdev->dev, &ifc_vdpa_ops, 1, 1, NULL, false);
	if (IS_ERR(adapter)) {
		IFCVF_ERR(pdev, "Failed to allocate vDPA structure");
		return PTR_ERR(adapter);
	}

	ifcvf_mgmt_dev->adapter = adapter;
	adapter->pdev = pdev;
	adapter->vdpa.dma_dev = &pdev->dev;
	adapter->vdpa.mdev = mdev;
	adapter->vf = vf;
	vdpa_dev = &adapter->vdpa;

	if (name)
		ret = dev_set_name(&vdpa_dev->dev, "%s", name);
	else
		ret = dev_set_name(&vdpa_dev->dev, "vdpa%u", vdpa_dev->index);

	ret = _vdpa_register_device(&adapter->vdpa, vf->nr_vring);
	if (ret) {
		put_device(&adapter->vdpa.dev);
		IFCVF_ERR(pdev, "Failed to register to vDPA bus");
		return ret;
	}

	return 0;
}

static void ifcvf_vdpa_dev_del(struct vdpa_mgmt_dev *mdev, struct vdpa_device *dev)
{
	struct ifcvf_vdpa_mgmt_dev *ifcvf_mgmt_dev;

	ifcvf_mgmt_dev = container_of(mdev, struct ifcvf_vdpa_mgmt_dev, mdev);
	_vdpa_unregister_device(dev);
	ifcvf_mgmt_dev->adapter = NULL;
}

static const struct vdpa_mgmtdev_ops ifcvf_vdpa_mgmt_dev_ops = {
	.dev_add = ifcvf_vdpa_dev_add,
	.dev_del = ifcvf_vdpa_dev_del
};

static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
	struct ifcvf_vdpa_mgmt_dev *ifcvf_mgmt_dev;
	struct device *dev = &pdev->dev;
	struct ifcvf_hw *vf;
	u32 dev_type;
	int ret, i;

	ret = pcim_enable_device(pdev);
	if (ret) {
		IFCVF_ERR(pdev, "Failed to enable device\n");
		return ret;
	}
	ret = pcim_iomap_regions(pdev, BIT(0) | BIT(2) | BIT(4),
				 IFCVF_DRIVER_NAME);
	if (ret) {
		IFCVF_ERR(pdev, "Failed to request MMIO region\n");
		return ret;
	}

	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
	if (ret) {
		IFCVF_ERR(pdev, "No usable DMA configuration\n");
		return ret;
	}

	ret = devm_add_action_or_reset(dev, ifcvf_free_irq_vectors, pdev);
	if (ret) {
		IFCVF_ERR(pdev,
			  "Failed for adding devres for freeing irq vectors\n");
		return ret;
	}

	pci_set_master(pdev);
	ifcvf_mgmt_dev = kzalloc(sizeof(struct ifcvf_vdpa_mgmt_dev), GFP_KERNEL);
	if (!ifcvf_mgmt_dev) {
		IFCVF_ERR(pdev, "Failed to alloc memory for the vDPA management device\n");
		return -ENOMEM;
	}

	vf = &ifcvf_mgmt_dev->vf;
	vf->dev_type = get_dev_type(pdev);
	vf->base = pcim_iomap_table(pdev);
	vf->pdev = pdev;

	ret = ifcvf_init_hw(vf, pdev);
	if (ret) {
		IFCVF_ERR(pdev, "Failed to init IFCVF hw\n");
		goto err;
	}

	for (i = 0; i < vf->nr_vring; i++)
		vf->vring[i].irq = -EINVAL;

	vf->hw_features = ifcvf_get_hw_features(vf);
	vf->config_size = ifcvf_get_config_size(vf);

	dev_type = get_dev_type(pdev);
	switch (dev_type) {
	case VIRTIO_ID_NET:
		ifcvf_mgmt_dev->mdev.id_table = id_table_net;
		break;
	case VIRTIO_ID_BLOCK:
		ifcvf_mgmt_dev->mdev.id_table = id_table_blk;
		break;
	default:
		IFCVF_ERR(pdev, "VIRTIO ID %u not supported\n", dev_type);
		ret = -EOPNOTSUPP;
		goto err;
	}

	ifcvf_mgmt_dev->mdev.ops = &ifcvf_vdpa_mgmt_dev_ops;
	ifcvf_mgmt_dev->mdev.device = dev;
	ifcvf_mgmt_dev->mdev.max_supported_vqs = vf->nr_vring;
	ifcvf_mgmt_dev->mdev.supported_features = vf->hw_features;

	ret = vdpa_mgmtdev_register(&ifcvf_mgmt_dev->mdev);
	if (ret) {
		IFCVF_ERR(pdev,
			  "Failed to initialize the management interfaces\n");
		goto err;
	}

	pci_set_drvdata(pdev, ifcvf_mgmt_dev);

	return 0;

err:
	kfree(ifcvf_mgmt_dev);
	return ret;
}

static void ifcvf_remove(struct pci_dev *pdev)
{
	struct ifcvf_vdpa_mgmt_dev *ifcvf_mgmt_dev;

	ifcvf_mgmt_dev = pci_get_drvdata(pdev);
	vdpa_mgmtdev_unregister(&ifcvf_mgmt_dev->mdev);
	kfree(ifcvf_mgmt_dev);
}

static struct pci_device_id ifcvf_pci_ids[] = {
	/* N3000 network device */
	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_REDHAT_QUMRANET,
			 N3000_DEVICE_ID,
			 PCI_VENDOR_ID_INTEL,
			 N3000_SUBSYS_DEVICE_ID) },
	/* C5000X-PL network device */
	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_REDHAT_QUMRANET,
			 VIRTIO_TRANS_ID_NET,
			 PCI_VENDOR_ID_INTEL,
			 VIRTIO_ID_NET) },
	/* C5000X-PL block device */
	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_REDHAT_QUMRANET,
			 VIRTIO_TRANS_ID_BLOCK,
			 PCI_VENDOR_ID_INTEL,
			 VIRTIO_ID_BLOCK) },

	{ 0 },
};
MODULE_DEVICE_TABLE(pci, ifcvf_pci_ids);

static struct pci_driver ifcvf_driver = {
	.name     = IFCVF_DRIVER_NAME,
	.id_table = ifcvf_pci_ids,
	.probe    = ifcvf_probe,
	.remove   = ifcvf_remove,
};

module_pci_driver(ifcvf_driver);

MODULE_LICENSE("GPL v2");