summaryrefslogtreecommitdiffstats
path: root/drivers/net/netdevsim/devlink.c
blob: 5135fc371f01ba27365b85c278b3c20b90e65c58 (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
/*
 * Copyright (c) 2018 Cumulus Networks. All rights reserved.
 * Copyright (c) 2018 David Ahern <dsa@cumulusnetworks.com>
 *
 * This software is licensed under the GNU General License Version 2,
 * June 1991 as shown in the file COPYING in the top-level directory of this
 * source tree.
 *
 * THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS"
 * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE
 * OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME
 * THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
 */

#include <linux/device.h>
#include <net/devlink.h>
#include <net/netns/generic.h>

#include "netdevsim.h"

static unsigned int nsim_devlink_id;

/* place holder until devlink and namespaces is sorted out */
static struct net *nsim_devlink_net(struct devlink *devlink)
{
	return &init_net;
}

/* IPv4
 */
static u64 nsim_ipv4_fib_resource_occ_get(void *priv)
{
	struct net *net = priv;

	return nsim_fib_get_val(net, NSIM_RESOURCE_IPV4_FIB, false);
}

static u64 nsim_ipv4_fib_rules_res_occ_get(void *priv)
{
	struct net *net = priv;

	return nsim_fib_get_val(net, NSIM_RESOURCE_IPV4_FIB_RULES, false);
}

/* IPv6
 */
static u64 nsim_ipv6_fib_resource_occ_get(void *priv)
{
	struct net *net = priv;

	return nsim_fib_get_val(net, NSIM_RESOURCE_IPV6_FIB, false);
}

static u64 nsim_ipv6_fib_rules_res_occ_get(void *priv)
{
	struct net *net = priv;

	return nsim_fib_get_val(net, NSIM_RESOURCE_IPV6_FIB_RULES, false);
}

static int devlink_resources_register(struct devlink *devlink)
{
	struct devlink_resource_size_params params = {
		.size_max = (u64)-1,
		.size_granularity = 1,
		.unit = DEVLINK_RESOURCE_UNIT_ENTRY
	};
	struct net *net = nsim_devlink_net(devlink);
	int err;
	u64 n;

	/* Resources for IPv4 */
	err = devlink_resource_register(devlink, "IPv4", (u64)-1,
					NSIM_RESOURCE_IPV4,
					DEVLINK_RESOURCE_ID_PARENT_TOP,
					&params);
	if (err) {
		pr_err("Failed to register IPv4 top resource\n");
		goto out;
	}

	n = nsim_fib_get_val(net, NSIM_RESOURCE_IPV4_FIB, true);
	err = devlink_resource_register(devlink, "fib", n,
					NSIM_RESOURCE_IPV4_FIB,
					NSIM_RESOURCE_IPV4, &params);
	if (err) {
		pr_err("Failed to register IPv4 FIB resource\n");
		return err;
	}

	n = nsim_fib_get_val(net, NSIM_RESOURCE_IPV4_FIB_RULES, true);
	err = devlink_resource_register(devlink, "fib-rules", n,
					NSIM_RESOURCE_IPV4_FIB_RULES,
					NSIM_RESOURCE_IPV4, &params);
	if (err) {
		pr_err("Failed to register IPv4 FIB rules resource\n");
		return err;
	}

	/* Resources for IPv6 */
	err = devlink_resource_register(devlink, "IPv6", (u64)-1,
					NSIM_RESOURCE_IPV6,
					DEVLINK_RESOURCE_ID_PARENT_TOP,
					&params);
	if (err) {
		pr_err("Failed to register IPv6 top resource\n");
		goto out;
	}

	n = nsim_fib_get_val(net, NSIM_RESOURCE_IPV6_FIB, true);
	err = devlink_resource_register(devlink, "fib", n,
					NSIM_RESOURCE_IPV6_FIB,
					NSIM_RESOURCE_IPV6, &params);
	if (err) {
		pr_err("Failed to register IPv6 FIB resource\n");
		return err;
	}

	n = nsim_fib_get_val(net, NSIM_RESOURCE_IPV6_FIB_RULES, true);
	err = devlink_resource_register(devlink, "fib-rules", n,
					NSIM_RESOURCE_IPV6_FIB_RULES,
					NSIM_RESOURCE_IPV6, &params);
	if (err) {
		pr_err("Failed to register IPv6 FIB rules resource\n");
		return err;
	}

	devlink_resource_occ_get_register(devlink,
					  NSIM_RESOURCE_IPV4_FIB,
					  nsim_ipv4_fib_resource_occ_get,
					  net);
	devlink_resource_occ_get_register(devlink,
					  NSIM_RESOURCE_IPV4_FIB_RULES,
					  nsim_ipv4_fib_rules_res_occ_get,
					  net);
	devlink_resource_occ_get_register(devlink,
					  NSIM_RESOURCE_IPV6_FIB,
					  nsim_ipv6_fib_resource_occ_get,
					  net);
	devlink_resource_occ_get_register(devlink,
					  NSIM_RESOURCE_IPV6_FIB_RULES,
					  nsim_ipv6_fib_rules_res_occ_get,
					  net);
out:
	return err;
}

static int nsim_devlink_reload(struct devlink *devlink,
			       struct netlink_ext_ack *extack)
{
	enum nsim_resource_id res_ids[] = {
		NSIM_RESOURCE_IPV4_FIB, NSIM_RESOURCE_IPV4_FIB_RULES,
		NSIM_RESOURCE_IPV6_FIB, NSIM_RESOURCE_IPV6_FIB_RULES
	};
	struct net *net = nsim_devlink_net(devlink);
	int i;

	for (i = 0; i < ARRAY_SIZE(res_ids); ++i) {
		int err;
		u64 val;

		err = devlink_resource_size_get(devlink, res_ids[i], &val);
		if (!err) {
			err = nsim_fib_set_max(net, res_ids[i], val, extack);
			if (err)
				return err;
		}
	}

	return 0;
}

static void nsim_devlink_net_reset(struct net *net)
{
	enum nsim_resource_id res_ids[] = {
		NSIM_RESOURCE_IPV4_FIB, NSIM_RESOURCE_IPV4_FIB_RULES,
		NSIM_RESOURCE_IPV6_FIB, NSIM_RESOURCE_IPV6_FIB_RULES
	};
	int i;

	for (i = 0; i < ARRAY_SIZE(res_ids); ++i) {
		if (nsim_fib_set_max(net, res_ids[i], (u64)-1, NULL)) {
			pr_err("Failed to reset limit for resource %u\n",
			       res_ids[i]);
		}
	}
}

static const struct devlink_ops nsim_devlink_ops = {
	.reload = nsim_devlink_reload,
};

/* once devlink / namespace issues are sorted out
 * this needs to be net in which a devlink instance
 * is to be created. e.g., dev_net(ns->netdev)
 */
static struct net *nsim_to_net(struct netdevsim *ns)
{
	return &init_net;
}

void nsim_devlink_teardown(struct netdevsim *ns)
{
	if (ns->devlink) {
		struct net *net = nsim_to_net(ns);
		bool *reg_devlink = net_generic(net, nsim_devlink_id);

		devlink_resources_unregister(ns->devlink, NULL);
		devlink_unregister(ns->devlink);
		devlink_free(ns->devlink);
		ns->devlink = NULL;

		nsim_devlink_net_reset(net);
		*reg_devlink = true;
	}
}

int nsim_devlink_setup(struct netdevsim *ns)
{
	struct net *net = nsim_to_net(ns);
	bool *reg_devlink = net_generic(net, nsim_devlink_id);
	struct devlink *devlink;
	int err;

	/* only one device per namespace controls devlink */
	if (!*reg_devlink) {
		ns->devlink = NULL;
		return 0;
	}

	devlink = devlink_alloc(&nsim_devlink_ops, 0);
	if (!devlink)
		return -ENOMEM;

	err = devlink_register(devlink, &ns->dev);
	if (err)
		goto err_devlink_free;

	err = devlink_resources_register(devlink);
	if (err)
		goto err_dl_unregister;

	ns->devlink = devlink;

	*reg_devlink = false;

	return 0;

err_dl_unregister:
	devlink_unregister(devlink);
err_devlink_free:
	devlink_free(devlink);

	return err;
}

/* Initialize per network namespace state */
static int __net_init nsim_devlink_netns_init(struct net *net)
{
	bool *reg_devlink = net_generic(net, nsim_devlink_id);

	*reg_devlink = true;

	return 0;
}

static struct pernet_operations nsim_devlink_net_ops = {
	.init = nsim_devlink_netns_init,
	.id   = &nsim_devlink_id,
	.size = sizeof(bool),
};

void nsim_devlink_exit(void)
{
	unregister_pernet_subsys(&nsim_devlink_net_ops);
	nsim_fib_exit();
}

int nsim_devlink_init(void)
{
	int err;

	err = nsim_fib_init();
	if (err)
		goto err_out;

	err = register_pernet_subsys(&nsim_devlink_net_ops);
	if (err)
		nsim_fib_exit();

err_out:
	return err;
}