summaryrefslogtreecommitdiff
path: root/drivers/vdpa/ifcvf/ifcvf_main.c
blob: abf6a061cab6583db4e167235c9b4706add5dcfb (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
// 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 VERSION_STRING  "0.1"
#define DRIVER_AUTHOR   "Intel Corporation"
#define IFCVF_DRIVER_NAME       "ifcvf"

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

	vf->nr_vring = IFCVF_MAX_QUEUE_PAIRS * 2;
	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 < IFCVF_MAX_QUEUE_PAIRS * 2; 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 < IFCVF_MAX_QUEUE_PAIRS * 2; 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_features(struct vdpa_device *vdpa_dev)
{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
	u64 features;

	features = ifcvf_get_features(vf) & IFCVF_SUPPORTED_FEATURES;

	return features;
}

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

	vf->req_features = features;

	return 0;
}

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;

	vf  = vdpa_to_vf(vdpa_dev);
	adapter = dev_get_drvdata(vdpa_dev->dev.parent);

	if (status == 0) {
		ifcvf_stop_datapath(adapter);
		ifcvf_reset_vring(adapter);
		return;
	}

	if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
		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 u16 ifcvf_vdpa_get_vq_num_max(struct vdpa_device *vdpa_dev)
{
	return IFCVF_QUEUE_MAX;
}

static u64 ifcvf_vdpa_get_vq_state(struct vdpa_device *vdpa_dev, u16 qid)
{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	return ifcvf_get_vq_state(vf, qid);
}

static int ifcvf_vdpa_set_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
				   u64 num)
{
	struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);

	return ifcvf_set_vq_state(vf, qid, num);
}

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 ioread8(&vf->common_cfg->config_generation);
}

static u32 ifcvf_vdpa_get_device_id(struct vdpa_device *vdpa_dev)
{
	return VIRTIO_ID_NET;
}

static u32 ifcvf_vdpa_get_vendor_id(struct vdpa_device *vdpa_dev)
{
	return IFCVF_SUBSYS_VENDOR_ID;
}

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

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);

	WARN_ON(offset + len > sizeof(struct virtio_net_config));
	ifcvf_read_net_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);

	WARN_ON(offset + len > sizeof(struct virtio_net_config));
	ifcvf_write_net_config(vf, offset, buf, len);
}

static void ifcvf_vdpa_set_config_cb(struct vdpa_device *vdpa_dev,
				     struct vdpa_callback *cb)
{
	/* We don't support config interrupt */
}

/*
 * IFCVF currently does't have on-chip IOMMU, so not
 * implemented set_map()/dma_map()/dma_unmap()
 */
static const struct vdpa_config_ops ifc_vdpa_ops = {
	.get_features	= ifcvf_vdpa_get_features,
	.set_features	= ifcvf_vdpa_set_features,
	.get_status	= ifcvf_vdpa_get_status,
	.set_status	= ifcvf_vdpa_set_status,
	.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,
	.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_config	= ifcvf_vdpa_get_config,
	.set_config	= ifcvf_vdpa_set_config,
	.set_config_cb  = ifcvf_vdpa_set_config_cb,
};

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


	for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) {
		snprintf(vf->vring[i].msix_name, 256, "ifcvf[%s]-%d\n",
			 pci_name(pdev), i);
		vector = i + IFCVF_MSI_QUEUE_OFF;
		irq = pci_irq_vector(pdev, vector);
		ret = devm_request_irq(&pdev->dev, irq,
				       ifcvf_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);
			return ret;
		}
		vf->vring[i].irq = irq;
	}

	return 0;
}

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

static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
	struct device *dev = &pdev->dev;
	struct ifcvf_adapter *adapter;
	struct ifcvf_hw *vf;
	int ret;

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

	ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
	if (ret) {
		IFCVF_ERR(pdev,
			  "No usable coherent DMA confiugration\n");
		return ret;
	}

	ret = pci_alloc_irq_vectors(pdev, IFCVF_MAX_INTR,
				    IFCVF_MAX_INTR, PCI_IRQ_MSIX);
	if (ret < 0) {
		IFCVF_ERR(pdev, "Failed to alloc irq vectors\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;
	}

	adapter = vdpa_alloc_device(struct ifcvf_adapter, vdpa,
				    dev, &ifc_vdpa_ops);
	if (adapter == NULL) {
		IFCVF_ERR(pdev, "Failed to allocate vDPA structure");
		return -ENOMEM;
	}

	pci_set_master(pdev);
	pci_set_drvdata(pdev, adapter);

	vf = &adapter->vf;
	vf->base = pcim_iomap_table(pdev);

	adapter->pdev = pdev;
	adapter->vdpa.dma_dev = &pdev->dev;

	ret = ifcvf_request_irq(adapter);
	if (ret) {
		IFCVF_ERR(pdev, "Failed to request MSI-X irq\n");
		goto err;
	}

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

	ret = vdpa_register_device(&adapter->vdpa);
	if (ret) {
		IFCVF_ERR(pdev, "Failed to register ifcvf to vdpa bus");
		goto err;
	}

	return 0;

err:
	put_device(&adapter->vdpa.dev);
	return ret;
}

static void ifcvf_remove(struct pci_dev *pdev)
{
	struct ifcvf_adapter *adapter = pci_get_drvdata(pdev);

	vdpa_unregister_device(&adapter->vdpa);
}

static struct pci_device_id ifcvf_pci_ids[] = {
	{ PCI_DEVICE_SUB(IFCVF_VENDOR_ID,
		IFCVF_DEVICE_ID,
		IFCVF_SUBSYS_VENDOR_ID,
		IFCVF_SUBSYS_DEVICE_ID) },
	{ 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");
MODULE_VERSION(VERSION_STRING);