summaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/mellanox/mlxsw/minimal.c
blob: 00c390024350d9b47570ec718e51c78faa4b6cb4 (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
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/* Copyright (c) 2016-2019 Mellanox Technologies. All rights reserved */

#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/types.h>

#include "core.h"
#include "core_env.h"
#include "i2c.h"

static const char mlxsw_m_driver_name[] = "mlxsw_minimal";

struct mlxsw_m_port;

struct mlxsw_m {
	struct mlxsw_m_port **ports;
	int *module_to_port;
	struct mlxsw_core *core;
	const struct mlxsw_bus_info *bus_info;
	u8 base_mac[ETH_ALEN];
	u8 max_ports;
};

struct mlxsw_m_port {
	struct net_device *dev;
	struct mlxsw_m *mlxsw_m;
	u8 local_port;
	u8 module;
};

static int mlxsw_m_base_mac_get(struct mlxsw_m *mlxsw_m)
{
	char spad_pl[MLXSW_REG_SPAD_LEN] = {0};
	int err;

	err = mlxsw_reg_query(mlxsw_m->core, MLXSW_REG(spad), spad_pl);
	if (err)
		return err;
	mlxsw_reg_spad_base_mac_memcpy_from(spad_pl, mlxsw_m->base_mac);
	return 0;
}

static int mlxsw_m_port_dummy_open_stop(struct net_device *dev)
{
	return 0;
}

static int
mlxsw_m_port_get_phys_port_name(struct net_device *dev, char *name, size_t len)
{
	struct mlxsw_m_port *mlxsw_m_port = netdev_priv(dev);
	struct mlxsw_core *core = mlxsw_m_port->mlxsw_m->core;
	u8 local_port = mlxsw_m_port->local_port;

	return mlxsw_core_port_get_phys_port_name(core, local_port, name, len);
}

static int mlxsw_m_port_get_port_parent_id(struct net_device *dev,
					   struct netdev_phys_item_id *ppid)
{
	struct mlxsw_m_port *mlxsw_m_port = netdev_priv(dev);
	struct mlxsw_m *mlxsw_m = mlxsw_m_port->mlxsw_m;

	ppid->id_len = sizeof(mlxsw_m->base_mac);
	memcpy(&ppid->id, &mlxsw_m->base_mac, ppid->id_len);

	return 0;
}

static const struct net_device_ops mlxsw_m_port_netdev_ops = {
	.ndo_open		= mlxsw_m_port_dummy_open_stop,
	.ndo_stop		= mlxsw_m_port_dummy_open_stop,
	.ndo_get_phys_port_name	= mlxsw_m_port_get_phys_port_name,
	.ndo_get_port_parent_id	= mlxsw_m_port_get_port_parent_id,
};

static int mlxsw_m_get_module_info(struct net_device *netdev,
				   struct ethtool_modinfo *modinfo)
{
	struct mlxsw_m_port *mlxsw_m_port = netdev_priv(netdev);
	struct mlxsw_core *core = mlxsw_m_port->mlxsw_m->core;

	return mlxsw_env_get_module_info(core, mlxsw_m_port->module, modinfo);
}

static int
mlxsw_m_get_module_eeprom(struct net_device *netdev, struct ethtool_eeprom *ee,
			  u8 *data)
{
	struct mlxsw_m_port *mlxsw_m_port = netdev_priv(netdev);
	struct mlxsw_core *core = mlxsw_m_port->mlxsw_m->core;

	return mlxsw_env_get_module_eeprom(netdev, core, mlxsw_m_port->module,
					   ee, data);
}

static const struct ethtool_ops mlxsw_m_port_ethtool_ops = {
	.get_module_info	= mlxsw_m_get_module_info,
	.get_module_eeprom	= mlxsw_m_get_module_eeprom,
};

static int
mlxsw_m_port_module_info_get(struct mlxsw_m *mlxsw_m, u8 local_port,
			     u8 *p_module, u8 *p_width)
{
	char pmlp_pl[MLXSW_REG_PMLP_LEN];
	int err;

	mlxsw_reg_pmlp_pack(pmlp_pl, local_port);
	err = mlxsw_reg_query(mlxsw_m->core, MLXSW_REG(pmlp), pmlp_pl);
	if (err)
		return err;
	*p_module = mlxsw_reg_pmlp_module_get(pmlp_pl, 0);
	*p_width = mlxsw_reg_pmlp_width_get(pmlp_pl);

	return 0;
}

static int
mlxsw_m_port_dev_addr_get(struct mlxsw_m_port *mlxsw_m_port)
{
	struct mlxsw_m *mlxsw_m = mlxsw_m_port->mlxsw_m;
	struct net_device *dev = mlxsw_m_port->dev;
	char ppad_pl[MLXSW_REG_PPAD_LEN];
	int err;

	mlxsw_reg_ppad_pack(ppad_pl, false, 0);
	err = mlxsw_reg_query(mlxsw_m->core, MLXSW_REG(ppad), ppad_pl);
	if (err)
		return err;
	mlxsw_reg_ppad_mac_memcpy_from(ppad_pl, dev->dev_addr);
	/* The last byte value in base mac address is guaranteed
	 * to be such it does not overflow when adding local_port
	 * value.
	 */
	dev->dev_addr[ETH_ALEN - 1] += mlxsw_m_port->module + 1;
	return 0;
}

static int
mlxsw_m_port_create(struct mlxsw_m *mlxsw_m, u8 local_port, u8 module)
{
	struct mlxsw_m_port *mlxsw_m_port;
	struct net_device *dev;
	int err;

	err = mlxsw_core_port_init(mlxsw_m->core, local_port);
	if (err) {
		dev_err(mlxsw_m->bus_info->dev, "Port %d: Failed to init core port\n",
			local_port);
		return err;
	}

	dev = alloc_etherdev(sizeof(struct mlxsw_m_port));
	if (!dev) {
		err = -ENOMEM;
		goto err_alloc_etherdev;
	}

	SET_NETDEV_DEV(dev, mlxsw_m->bus_info->dev);
	mlxsw_m_port = netdev_priv(dev);
	mlxsw_m_port->dev = dev;
	mlxsw_m_port->mlxsw_m = mlxsw_m;
	mlxsw_m_port->local_port = local_port;
	mlxsw_m_port->module = module;

	dev->netdev_ops = &mlxsw_m_port_netdev_ops;
	dev->ethtool_ops = &mlxsw_m_port_ethtool_ops;

	err = mlxsw_m_port_dev_addr_get(mlxsw_m_port);
	if (err) {
		dev_err(mlxsw_m->bus_info->dev, "Port %d: Unable to get port mac address\n",
			mlxsw_m_port->local_port);
		goto err_dev_addr_get;
	}

	netif_carrier_off(dev);
	mlxsw_m->ports[local_port] = mlxsw_m_port;
	err = register_netdev(dev);
	if (err) {
		dev_err(mlxsw_m->bus_info->dev, "Port %d: Failed to register netdev\n",
			mlxsw_m_port->local_port);
		goto err_register_netdev;
	}

	mlxsw_core_port_eth_set(mlxsw_m->core, mlxsw_m_port->local_port,
				mlxsw_m_port, dev, module + 1, false, 0);

	return 0;

err_register_netdev:
	mlxsw_m->ports[local_port] = NULL;
	free_netdev(dev);
err_dev_addr_get:
err_alloc_etherdev:
	mlxsw_core_port_fini(mlxsw_m->core, local_port);
	return err;
}

static void mlxsw_m_port_remove(struct mlxsw_m *mlxsw_m, u8 local_port)
{
	struct mlxsw_m_port *mlxsw_m_port = mlxsw_m->ports[local_port];

	mlxsw_core_port_clear(mlxsw_m->core, local_port, mlxsw_m);
	unregister_netdev(mlxsw_m_port->dev); /* This calls ndo_stop */
	mlxsw_m->ports[local_port] = NULL;
	free_netdev(mlxsw_m_port->dev);
	mlxsw_core_port_fini(mlxsw_m->core, local_port);
}

static int mlxsw_m_port_module_map(struct mlxsw_m *mlxsw_m, u8 local_port,
				   u8 *last_module)
{
	u8 module, width;
	int err;

	/* Fill out to local port mapping array */
	err = mlxsw_m_port_module_info_get(mlxsw_m, local_port, &module,
					   &width);
	if (err)
		return err;

	if (!width)
		return 0;
	/* Skip, if port belongs to the cluster */
	if (module == *last_module)
		return 0;
	*last_module = module;
	mlxsw_m->module_to_port[module] = ++mlxsw_m->max_ports;

	return 0;
}

static void mlxsw_m_port_module_unmap(struct mlxsw_m *mlxsw_m, u8 module)
{
	mlxsw_m->module_to_port[module] = -1;
}

static int mlxsw_m_ports_create(struct mlxsw_m *mlxsw_m)
{
	unsigned int max_ports = mlxsw_core_max_ports(mlxsw_m->core);
	u8 last_module = max_ports;
	int i;
	int err;

	mlxsw_m->ports = kcalloc(max_ports, sizeof(*mlxsw_m->ports),
				 GFP_KERNEL);
	if (!mlxsw_m->ports)
		return -ENOMEM;

	mlxsw_m->module_to_port = kmalloc_array(max_ports, sizeof(int),
						GFP_KERNEL);
	if (!mlxsw_m->module_to_port) {
		err = -ENOMEM;
		goto err_module_to_port_alloc;
	}

	/* Invalidate the entries of module to local port mapping array */
	for (i = 0; i < max_ports; i++)
		mlxsw_m->module_to_port[i] = -1;

	/* Fill out module to local port mapping array */
	for (i = 1; i < max_ports; i++) {
		err = mlxsw_m_port_module_map(mlxsw_m, i, &last_module);
		if (err)
			goto err_module_to_port_map;
	}

	/* Create port objects for each valid entry */
	for (i = 0; i < mlxsw_m->max_ports; i++) {
		if (mlxsw_m->module_to_port[i] > 0) {
			err = mlxsw_m_port_create(mlxsw_m,
						  mlxsw_m->module_to_port[i],
						  i);
			if (err)
				goto err_module_to_port_create;
		}
	}

	return 0;

err_module_to_port_create:
	for (i--; i >= 0; i--) {
		if (mlxsw_m->module_to_port[i] > 0)
			mlxsw_m_port_remove(mlxsw_m,
					    mlxsw_m->module_to_port[i]);
	}
	i = max_ports;
err_module_to_port_map:
	for (i--; i > 0; i--)
		mlxsw_m_port_module_unmap(mlxsw_m, i);
	kfree(mlxsw_m->module_to_port);
err_module_to_port_alloc:
	kfree(mlxsw_m->ports);
	return err;
}

static void mlxsw_m_ports_remove(struct mlxsw_m *mlxsw_m)
{
	int i;

	for (i = 0; i < mlxsw_m->max_ports; i++) {
		if (mlxsw_m->module_to_port[i] > 0) {
			mlxsw_m_port_remove(mlxsw_m,
					    mlxsw_m->module_to_port[i]);
			mlxsw_m_port_module_unmap(mlxsw_m, i);
		}
	}

	kfree(mlxsw_m->module_to_port);
	kfree(mlxsw_m->ports);
}

static int mlxsw_m_init(struct mlxsw_core *mlxsw_core,
			const struct mlxsw_bus_info *mlxsw_bus_info)
{
	struct mlxsw_m *mlxsw_m = mlxsw_core_driver_priv(mlxsw_core);
	int err;

	mlxsw_m->core = mlxsw_core;
	mlxsw_m->bus_info = mlxsw_bus_info;

	err = mlxsw_m_base_mac_get(mlxsw_m);
	if (err) {
		dev_err(mlxsw_m->bus_info->dev, "Failed to get base mac\n");
		return err;
	}

	err = mlxsw_m_ports_create(mlxsw_m);
	if (err) {
		dev_err(mlxsw_m->bus_info->dev, "Failed to create ports\n");
		return err;
	}

	return 0;
}

static void mlxsw_m_fini(struct mlxsw_core *mlxsw_core)
{
	struct mlxsw_m *mlxsw_m = mlxsw_core_driver_priv(mlxsw_core);

	mlxsw_m_ports_remove(mlxsw_m);
}

static const struct mlxsw_config_profile mlxsw_m_config_profile;

static struct mlxsw_driver mlxsw_m_driver = {
	.kind			= mlxsw_m_driver_name,
	.priv_size		= sizeof(struct mlxsw_m),
	.init			= mlxsw_m_init,
	.fini			= mlxsw_m_fini,
	.profile		= &mlxsw_m_config_profile,
	.res_query_enabled	= true,
};

static const struct i2c_device_id mlxsw_m_i2c_id[] = {
	{ "mlxsw_minimal", 0},
	{ },
};

static struct i2c_driver mlxsw_m_i2c_driver = {
	.driver.name = "mlxsw_minimal",
	.class = I2C_CLASS_HWMON,
	.id_table = mlxsw_m_i2c_id,
};

static int __init mlxsw_m_module_init(void)
{
	int err;

	err = mlxsw_core_driver_register(&mlxsw_m_driver);
	if (err)
		return err;

	err = mlxsw_i2c_driver_register(&mlxsw_m_i2c_driver);
	if (err)
		goto err_i2c_driver_register;

	return 0;

err_i2c_driver_register:
	mlxsw_core_driver_unregister(&mlxsw_m_driver);

	return err;
}

static void __exit mlxsw_m_module_exit(void)
{
	mlxsw_i2c_driver_unregister(&mlxsw_m_i2c_driver);
	mlxsw_core_driver_unregister(&mlxsw_m_driver);
}

module_init(mlxsw_m_module_init);
module_exit(mlxsw_m_module_exit);

MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
MODULE_DESCRIPTION("Mellanox minimal driver");
MODULE_DEVICE_TABLE(i2c, mlxsw_m_i2c_id);