aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/netdevsim/bus.c
blob: 7971dc4f54f15fa20ad0ed579590872062f7dce6 (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
// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2017 Netronome Systems, Inc.
 * Copyright (C) 2019 Mellanox Technologies. All rights reserved
 */

#include <linux/device.h>
#include <linux/idr.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
#include <linux/sysfs.h>

#include "netdevsim.h"

static DEFINE_IDA(nsim_bus_dev_ids);
static LIST_HEAD(nsim_bus_dev_list);
static DEFINE_MUTEX(nsim_bus_dev_list_lock);
static bool nsim_bus_enable;

static struct nsim_bus_dev *to_nsim_bus_dev(struct device *dev)
{
	return container_of(dev, struct nsim_bus_dev, dev);
}

static int nsim_bus_dev_vfs_enable(struct nsim_bus_dev *nsim_bus_dev,
				   unsigned int num_vfs)
{
	nsim_bus_dev->vfconfigs = kcalloc(num_vfs,
					  sizeof(struct nsim_vf_config),
					  GFP_KERNEL | __GFP_NOWARN);
	if (!nsim_bus_dev->vfconfigs)
		return -ENOMEM;
	nsim_bus_dev->num_vfs = num_vfs;

	return 0;
}

static void nsim_bus_dev_vfs_disable(struct nsim_bus_dev *nsim_bus_dev)
{
	kfree(nsim_bus_dev->vfconfigs);
	nsim_bus_dev->vfconfigs = NULL;
	nsim_bus_dev->num_vfs = 0;
}

static ssize_t
nsim_bus_dev_numvfs_store(struct device *dev, struct device_attribute *attr,
			  const char *buf, size_t count)
{
	struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
	unsigned int num_vfs;
	int ret;

	ret = kstrtouint(buf, 0, &num_vfs);
	if (ret)
		return ret;

	rtnl_lock();
	if (nsim_bus_dev->num_vfs == num_vfs)
		goto exit_good;
	if (nsim_bus_dev->num_vfs && num_vfs) {
		ret = -EBUSY;
		goto exit_unlock;
	}

	if (num_vfs) {
		ret = nsim_bus_dev_vfs_enable(nsim_bus_dev, num_vfs);
		if (ret)
			goto exit_unlock;
	} else {
		nsim_bus_dev_vfs_disable(nsim_bus_dev);
	}
exit_good:
	ret = count;
exit_unlock:
	rtnl_unlock();

	return ret;
}

static ssize_t
nsim_bus_dev_numvfs_show(struct device *dev,
			 struct device_attribute *attr, char *buf)
{
	struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);

	return sprintf(buf, "%u\n", nsim_bus_dev->num_vfs);
}

static struct device_attribute nsim_bus_dev_numvfs_attr =
	__ATTR(sriov_numvfs, 0664, nsim_bus_dev_numvfs_show,
	       nsim_bus_dev_numvfs_store);

static ssize_t
new_port_store(struct device *dev, struct device_attribute *attr,
	       const char *buf, size_t count)
{
	struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
	struct nsim_dev *nsim_dev = dev_get_drvdata(dev);
	struct devlink *devlink;
	unsigned int port_index;
	int ret;

	/* Prevent to use nsim_bus_dev before initialization. */
	if (!smp_load_acquire(&nsim_bus_dev->init))
		return -EBUSY;
	ret = kstrtouint(buf, 0, &port_index);
	if (ret)
		return ret;

	devlink = priv_to_devlink(nsim_dev);

	mutex_lock(&nsim_bus_dev->nsim_bus_reload_lock);
	devlink_reload_disable(devlink);
	ret = nsim_dev_port_add(nsim_bus_dev, port_index);
	devlink_reload_enable(devlink);
	mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock);
	return ret ? ret : count;
}

static struct device_attribute nsim_bus_dev_new_port_attr = __ATTR_WO(new_port);

static ssize_t
del_port_store(struct device *dev, struct device_attribute *attr,
	       const char *buf, size_t count)
{
	struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
	struct nsim_dev *nsim_dev = dev_get_drvdata(dev);
	struct devlink *devlink;
	unsigned int port_index;
	int ret;

	/* Prevent to use nsim_bus_dev before initialization. */
	if (!smp_load_acquire(&nsim_bus_dev->init))
		return -EBUSY;
	ret = kstrtouint(buf, 0, &port_index);
	if (ret)
		return ret;

	devlink = priv_to_devlink(nsim_dev);

	mutex_lock(&nsim_bus_dev->nsim_bus_reload_lock);
	devlink_reload_disable(devlink);
	ret = nsim_dev_port_del(nsim_bus_dev, port_index);
	devlink_reload_enable(devlink);
	mutex_unlock(&nsim_bus_dev->nsim_bus_reload_lock);
	return ret ? ret : count;
}

static struct device_attribute nsim_bus_dev_del_port_attr = __ATTR_WO(del_port);

static struct attribute *nsim_bus_dev_attrs[] = {
	&nsim_bus_dev_numvfs_attr.attr,
	&nsim_bus_dev_new_port_attr.attr,
	&nsim_bus_dev_del_port_attr.attr,
	NULL,
};

static const struct attribute_group nsim_bus_dev_attr_group = {
	.attrs = nsim_bus_dev_attrs,
};

static const struct attribute_group *nsim_bus_dev_attr_groups[] = {
	&nsim_bus_dev_attr_group,
	NULL,
};

static void nsim_bus_dev_release(struct device *dev)
{
	struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);

	nsim_bus_dev_vfs_disable(nsim_bus_dev);
}

static struct device_type nsim_bus_dev_type = {
	.groups = nsim_bus_dev_attr_groups,
	.release = nsim_bus_dev_release,
};

static struct nsim_bus_dev *
nsim_bus_dev_new(unsigned int id, unsigned int port_count);

static ssize_t
new_device_store(struct bus_type *bus, const char *buf, size_t count)
{
	struct nsim_bus_dev *nsim_bus_dev;
	unsigned int port_count;
	unsigned int id;
	int err;

	err = sscanf(buf, "%u %u", &id, &port_count);
	switch (err) {
	case 1:
		port_count = 1;
		/* fall through */
	case 2:
		if (id > INT_MAX) {
			pr_err("Value of \"id\" is too big.\n");
			return -EINVAL;
		}
		break;
	default:
		pr_err("Format for adding new device is \"id port_count\" (uint uint).\n");
		return -EINVAL;
	}

	mutex_lock(&nsim_bus_dev_list_lock);
	/* Prevent to use resource before initialization. */
	if (!smp_load_acquire(&nsim_bus_enable)) {
		err = -EBUSY;
		goto err;
	}

	nsim_bus_dev = nsim_bus_dev_new(id, port_count);
	if (IS_ERR(nsim_bus_dev)) {
		err = PTR_ERR(nsim_bus_dev);
		goto err;
	}

	/* Allow using nsim_bus_dev */
	smp_store_release(&nsim_bus_dev->init, true);

	list_add_tail(&nsim_bus_dev->list, &nsim_bus_dev_list);
	mutex_unlock(&nsim_bus_dev_list_lock);

	return count;
err:
	mutex_unlock(&nsim_bus_dev_list_lock);
	return err;
}
static BUS_ATTR_WO(new_device);

static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev);

static ssize_t
del_device_store(struct bus_type *bus, const char *buf, size_t count)
{
	struct nsim_bus_dev *nsim_bus_dev, *tmp;
	unsigned int id;
	int err;

	err = sscanf(buf, "%u", &id);
	switch (err) {
	case 1:
		if (id > INT_MAX) {
			pr_err("Value of \"id\" is too big.\n");
			return -EINVAL;
		}
		break;
	default:
		pr_err("Format for deleting device is \"id\" (uint).\n");
		return -EINVAL;
	}

	err = -ENOENT;
	mutex_lock(&nsim_bus_dev_list_lock);
	/* Prevent to use resource before initialization. */
	if (!smp_load_acquire(&nsim_bus_enable)) {
		mutex_unlock(&nsim_bus_dev_list_lock);
		return -EBUSY;
	}
	list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
		if (nsim_bus_dev->dev.id != id)
			continue;
		list_del(&nsim_bus_dev->list);
		nsim_bus_dev_del(nsim_bus_dev);
		err = 0;
		break;
	}
	mutex_unlock(&nsim_bus_dev_list_lock);
	return !err ? count : err;
}
static BUS_ATTR_WO(del_device);

static struct attribute *nsim_bus_attrs[] = {
	&bus_attr_new_device.attr,
	&bus_attr_del_device.attr,
	NULL
};
ATTRIBUTE_GROUPS(nsim_bus);

static int nsim_bus_probe(struct device *dev)
{
	struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);

	return nsim_dev_probe(nsim_bus_dev);
}

static int nsim_bus_remove(struct device *dev)
{
	struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);

	nsim_dev_remove(nsim_bus_dev);
	return 0;
}

static int nsim_num_vf(struct device *dev)
{
	struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);

	return nsim_bus_dev->num_vfs;
}

static struct bus_type nsim_bus = {
	.name		= DRV_NAME,
	.dev_name	= DRV_NAME,
	.bus_groups	= nsim_bus_groups,
	.probe		= nsim_bus_probe,
	.remove		= nsim_bus_remove,
	.num_vf		= nsim_num_vf,
};

static struct nsim_bus_dev *
nsim_bus_dev_new(unsigned int id, unsigned int port_count)
{
	struct nsim_bus_dev *nsim_bus_dev;
	int err;

	nsim_bus_dev = kzalloc(sizeof(*nsim_bus_dev), GFP_KERNEL);
	if (!nsim_bus_dev)
		return ERR_PTR(-ENOMEM);

	err = ida_alloc_range(&nsim_bus_dev_ids, id, id, GFP_KERNEL);
	if (err < 0)
		goto err_nsim_bus_dev_free;
	nsim_bus_dev->dev.id = err;
	nsim_bus_dev->dev.bus = &nsim_bus;
	nsim_bus_dev->dev.type = &nsim_bus_dev_type;
	nsim_bus_dev->port_count = port_count;
	nsim_bus_dev->initial_net = current->nsproxy->net_ns;
	mutex_init(&nsim_bus_dev->nsim_bus_reload_lock);
	/* Disallow using nsim_bus_dev */
	smp_store_release(&nsim_bus_dev->init, false);

	err = device_register(&nsim_bus_dev->dev);
	if (err)
		goto err_nsim_bus_dev_id_free;
	return nsim_bus_dev;

err_nsim_bus_dev_id_free:
	ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
err_nsim_bus_dev_free:
	kfree(nsim_bus_dev);
	return ERR_PTR(err);
}

static void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev)
{
	/* Disallow using nsim_bus_dev */
	smp_store_release(&nsim_bus_dev->init, false);
	device_unregister(&nsim_bus_dev->dev);
	ida_free(&nsim_bus_dev_ids, nsim_bus_dev->dev.id);
	kfree(nsim_bus_dev);
}

static struct device_driver nsim_driver = {
	.name		= DRV_NAME,
	.bus		= &nsim_bus,
	.owner		= THIS_MODULE,
};

int nsim_bus_init(void)
{
	int err;

	err = bus_register(&nsim_bus);
	if (err)
		return err;
	err = driver_register(&nsim_driver);
	if (err)
		goto err_bus_unregister;
	/* Allow using resources */
	smp_store_release(&nsim_bus_enable, true);
	return 0;

err_bus_unregister:
	bus_unregister(&nsim_bus);
	return err;
}

void nsim_bus_exit(void)
{
	struct nsim_bus_dev *nsim_bus_dev, *tmp;

	/* Disallow using resources */
	smp_store_release(&nsim_bus_enable, false);

	mutex_lock(&nsim_bus_dev_list_lock);
	list_for_each_entry_safe(nsim_bus_dev, tmp, &nsim_bus_dev_list, list) {
		list_del(&nsim_bus_dev->list);
		nsim_bus_dev_del(nsim_bus_dev);
	}
	mutex_unlock(&nsim_bus_dev_list_lock);

	driver_unregister(&nsim_driver);
	bus_unregister(&nsim_bus);
}