summaryrefslogtreecommitdiff
path: root/include/net/dsa.h
blob: 6cb602dd970c458042da6bf0199f8beed0d5c6c9 (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
/*
 * include/net/dsa.h - Driver for Distributed Switch Architecture switch chips
 * Copyright (c) 2008-2009 Marvell Semiconductor
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#ifndef __LINUX_NET_DSA_H
#define __LINUX_NET_DSA_H

#include <linux/if.h>
#include <linux/if_ether.h>
#include <linux/list.h>
#include <linux/notifier.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
#include <linux/of.h>
#include <linux/ethtool.h>
#include <net/devlink.h>
#include <net/switchdev.h>

struct tc_action;
struct phy_device;
struct fixed_phy_status;

enum dsa_tag_protocol {
	DSA_TAG_PROTO_NONE = 0,
	DSA_TAG_PROTO_BRCM,
	DSA_TAG_PROTO_BRCM_PREPEND,
	DSA_TAG_PROTO_DSA,
	DSA_TAG_PROTO_EDSA,
	DSA_TAG_PROTO_KSZ,
	DSA_TAG_PROTO_LAN9303,
	DSA_TAG_PROTO_MTK,
	DSA_TAG_PROTO_QCA,
	DSA_TAG_PROTO_TRAILER,
	DSA_TAG_LAST,		/* MUST BE LAST */
};

#define DSA_MAX_SWITCHES	4
#define DSA_MAX_PORTS		12

#define DSA_RTABLE_NONE		-1

struct dsa_chip_data {
	/*
	 * How to access the switch configuration registers.
	 */
	struct device	*host_dev;
	int		sw_addr;

	/*
	 * Reference to network devices
	 */
	struct device	*netdev[DSA_MAX_PORTS];

	/* set to size of eeprom if supported by the switch */
	int		eeprom_len;

	/* Device tree node pointer for this specific switch chip
	 * used during switch setup in case additional properties
	 * and resources needs to be used
	 */
	struct device_node *of_node;

	/*
	 * The names of the switch's ports.  Use "cpu" to
	 * designate the switch port that the cpu is connected to,
	 * "dsa" to indicate that this port is a DSA link to
	 * another switch, NULL to indicate the port is unused,
	 * or any other string to indicate this is a physical port.
	 */
	char		*port_names[DSA_MAX_PORTS];
	struct device_node *port_dn[DSA_MAX_PORTS];

	/*
	 * An array of which element [a] indicates which port on this
	 * switch should be used to send packets to that are destined
	 * for switch a. Can be NULL if there is only one switch chip.
	 */
	s8		rtable[DSA_MAX_SWITCHES];
};

struct dsa_platform_data {
	/*
	 * Reference to a Linux network interface that connects
	 * to the root switch chip of the tree.
	 */
	struct device	*netdev;
	struct net_device *of_netdev;

	/*
	 * Info structs describing each of the switch chips
	 * connected via this network interface.
	 */
	int		nr_chips;
	struct dsa_chip_data	*chip;
};

struct packet_type;

struct dsa_device_ops {
	struct sk_buff *(*xmit)(struct sk_buff *skb, struct net_device *dev);
	struct sk_buff *(*rcv)(struct sk_buff *skb, struct net_device *dev,
			       struct packet_type *pt);
	int (*flow_dissect)(const struct sk_buff *skb, __be16 *proto,
			    int *offset);
};

struct dsa_switch_tree {
	struct list_head	list;

	/* Notifier chain for switch-wide events */
	struct raw_notifier_head	nh;

	/* Tree identifier */
	unsigned int index;

	/* Number of switches attached to this tree */
	struct kref refcount;

	/* Has this tree been applied to the hardware? */
	bool setup;

	/*
	 * Configuration data for the platform device that owns
	 * this dsa switch tree instance.
	 */
	struct dsa_platform_data	*pd;

	/*
	 * The switch port to which the CPU is attached.
	 */
	struct dsa_port		*cpu_dp;

	/*
	 * Data for the individual switch chips.
	 */
	struct dsa_switch	*ds[DSA_MAX_SWITCHES];
};

/* TC matchall action types, only mirroring for now */
enum dsa_port_mall_action_type {
	DSA_PORT_MALL_MIRROR,
};

/* TC mirroring entry */
struct dsa_mall_mirror_tc_entry {
	u8 to_local_port;
	bool ingress;
};

/* TC matchall entry */
struct dsa_mall_tc_entry {
	struct list_head list;
	unsigned long cookie;
	enum dsa_port_mall_action_type type;
	union {
		struct dsa_mall_mirror_tc_entry mirror;
	};
};


struct dsa_port {
	/* A CPU port is physically connected to a master device.
	 * A user port exposed to userspace has a slave device.
	 */
	union {
		struct net_device *master;
		struct net_device *slave;
	};

	/* CPU port tagging operations used by master or slave devices */
	const struct dsa_device_ops *tag_ops;

	/* Copies for faster access in master receive hot path */
	struct dsa_switch_tree *dst;
	struct sk_buff *(*rcv)(struct sk_buff *skb, struct net_device *dev,
			       struct packet_type *pt);

	enum {
		DSA_PORT_TYPE_UNUSED = 0,
		DSA_PORT_TYPE_CPU,
		DSA_PORT_TYPE_DSA,
		DSA_PORT_TYPE_USER,
	} type;

	struct dsa_switch	*ds;
	unsigned int		index;
	const char		*name;
	const struct dsa_port	*cpu_dp;
	struct device_node	*dn;
	unsigned int		ageing_time;
	u8			stp_state;
	struct net_device	*bridge_dev;
	struct devlink_port	devlink_port;
	/*
	 * Original copy of the master netdev ethtool_ops
	 */
	const struct ethtool_ops *orig_ethtool_ops;
};

struct dsa_switch {
	struct device *dev;

	/*
	 * Parent switch tree, and switch index.
	 */
	struct dsa_switch_tree	*dst;
	unsigned int		index;

	/* Listener for switch fabric events */
	struct notifier_block	nb;

	/*
	 * Give the switch driver somewhere to hang its private data
	 * structure.
	 */
	void *priv;

	/*
	 * Configuration data for this switch.
	 */
	struct dsa_chip_data	*cd;

	/*
	 * The switch operations.
	 */
	const struct dsa_switch_ops	*ops;

	/*
	 * An array of which element [a] indicates which port on this
	 * switch should be used to send packets to that are destined
	 * for switch a. Can be NULL if there is only one switch chip.
	 */
	s8		rtable[DSA_MAX_SWITCHES];

	/*
	 * Slave mii_bus and devices for the individual ports.
	 */
	u32			phys_mii_mask;
	struct mii_bus		*slave_mii_bus;

	/* Ageing Time limits in msecs */
	unsigned int ageing_time_min;
	unsigned int ageing_time_max;

	/* devlink used to represent this switch device */
	struct devlink		*devlink;

	/* Number of switch port queues */
	unsigned int		num_tx_queues;

	/* Dynamically allocated ports, keep last */
	size_t num_ports;
	struct dsa_port ports[];
};

static inline const struct dsa_port *dsa_to_port(struct dsa_switch *ds, int p)
{
	return &ds->ports[p];
}

static inline bool dsa_is_unused_port(struct dsa_switch *ds, int p)
{
	return dsa_to_port(ds, p)->type == DSA_PORT_TYPE_UNUSED;
}

static inline bool dsa_is_cpu_port(struct dsa_switch *ds, int p)
{
	return dsa_to_port(ds, p)->type == DSA_PORT_TYPE_CPU;
}

static inline bool dsa_is_dsa_port(struct dsa_switch *ds, int p)
{
	return dsa_to_port(ds, p)->type == DSA_PORT_TYPE_DSA;
}

static inline bool dsa_is_user_port(struct dsa_switch *ds, int p)
{
	return dsa_to_port(ds, p)->type == DSA_PORT_TYPE_USER;
}

static inline u32 dsa_user_ports(struct dsa_switch *ds)
{
	u32 mask = 0;
	int p;

	for (p = 0; p < ds->num_ports; p++)
		if (dsa_is_user_port(ds, p))
			mask |= BIT(p);

	return mask;
}

/* Return the local port used to reach an arbitrary switch port */
static inline unsigned int dsa_towards_port(struct dsa_switch *ds, int device,
					    int port)
{
	if (device == ds->index)
		return port;
	else
		return ds->rtable[device];
}

/* Return the local port used to reach the dedicated CPU port */
static inline unsigned int dsa_upstream_port(struct dsa_switch *ds, int port)
{
	const struct dsa_port *dp = dsa_to_port(ds, port);
	const struct dsa_port *cpu_dp = dp->cpu_dp;

	if (!cpu_dp)
		return port;

	return dsa_towards_port(ds, cpu_dp->ds->index, cpu_dp->index);
}

typedef int dsa_fdb_dump_cb_t(const unsigned char *addr, u16 vid,
			      bool is_static, void *data);
struct dsa_switch_ops {
#if IS_ENABLED(CONFIG_NET_DSA_LEGACY)
	/*
	 * Legacy probing.
	 */
	const char	*(*probe)(struct device *dsa_dev,
				  struct device *host_dev, int sw_addr,
				  void **priv);
#endif

	enum dsa_tag_protocol (*get_tag_protocol)(struct dsa_switch *ds,
						  int port);

	int	(*setup)(struct dsa_switch *ds);
	u32	(*get_phy_flags)(struct dsa_switch *ds, int port);

	/*
	 * Access to the switch's PHY registers.
	 */
	int	(*phy_read)(struct dsa_switch *ds, int port, int regnum);
	int	(*phy_write)(struct dsa_switch *ds, int port,
			     int regnum, u16 val);

	/*
	 * Link state adjustment (called from libphy)
	 */
	void	(*adjust_link)(struct dsa_switch *ds, int port,
				struct phy_device *phydev);
	void	(*fixed_link_update)(struct dsa_switch *ds, int port,
				struct fixed_phy_status *st);

	/*
	 * ethtool hardware statistics.
	 */
	void	(*get_strings)(struct dsa_switch *ds, int port, uint8_t *data);
	void	(*get_ethtool_stats)(struct dsa_switch *ds,
				     int port, uint64_t *data);
	int	(*get_sset_count)(struct dsa_switch *ds);

	/*
	 * ethtool Wake-on-LAN
	 */
	void	(*get_wol)(struct dsa_switch *ds, int port,
			   struct ethtool_wolinfo *w);
	int	(*set_wol)(struct dsa_switch *ds, int port,
			   struct ethtool_wolinfo *w);

	/*
	 * Suspend and resume
	 */
	int	(*suspend)(struct dsa_switch *ds);
	int	(*resume)(struct dsa_switch *ds);

	/*
	 * Port enable/disable
	 */
	int	(*port_enable)(struct dsa_switch *ds, int port,
			       struct phy_device *phy);
	void	(*port_disable)(struct dsa_switch *ds, int port,
				struct phy_device *phy);

	/*
	 * Port's MAC EEE settings
	 */
	int	(*set_mac_eee)(struct dsa_switch *ds, int port,
			       struct ethtool_eee *e);
	int	(*get_mac_eee)(struct dsa_switch *ds, int port,
			       struct ethtool_eee *e);

	/* EEPROM access */
	int	(*get_eeprom_len)(struct dsa_switch *ds);
	int	(*get_eeprom)(struct dsa_switch *ds,
			      struct ethtool_eeprom *eeprom, u8 *data);
	int	(*set_eeprom)(struct dsa_switch *ds,
			      struct ethtool_eeprom *eeprom, u8 *data);

	/*
	 * Register access.
	 */
	int	(*get_regs_len)(struct dsa_switch *ds, int port);
	void	(*get_regs)(struct dsa_switch *ds, int port,
			    struct ethtool_regs *regs, void *p);

	/*
	 * Bridge integration
	 */
	int	(*set_ageing_time)(struct dsa_switch *ds, unsigned int msecs);
	int	(*port_bridge_join)(struct dsa_switch *ds, int port,
				    struct net_device *bridge);
	void	(*port_bridge_leave)(struct dsa_switch *ds, int port,
				     struct net_device *bridge);
	void	(*port_stp_state_set)(struct dsa_switch *ds, int port,
				      u8 state);
	void	(*port_fast_age)(struct dsa_switch *ds, int port);

	/*
	 * VLAN support
	 */
	int	(*port_vlan_filtering)(struct dsa_switch *ds, int port,
				       bool vlan_filtering);
	int (*port_vlan_prepare)(struct dsa_switch *ds, int port,
				 const struct switchdev_obj_port_vlan *vlan);
	void (*port_vlan_add)(struct dsa_switch *ds, int port,
			      const struct switchdev_obj_port_vlan *vlan);
	int	(*port_vlan_del)(struct dsa_switch *ds, int port,
				 const struct switchdev_obj_port_vlan *vlan);
	/*
	 * Forwarding database
	 */
	int	(*port_fdb_add)(struct dsa_switch *ds, int port,
				const unsigned char *addr, u16 vid);
	int	(*port_fdb_del)(struct dsa_switch *ds, int port,
				const unsigned char *addr, u16 vid);
	int	(*port_fdb_dump)(struct dsa_switch *ds, int port,
				 dsa_fdb_dump_cb_t *cb, void *data);

	/*
	 * Multicast database
	 */
	int (*port_mdb_prepare)(struct dsa_switch *ds, int port,
				const struct switchdev_obj_port_mdb *mdb);
	void (*port_mdb_add)(struct dsa_switch *ds, int port,
			     const struct switchdev_obj_port_mdb *mdb);
	int	(*port_mdb_del)(struct dsa_switch *ds, int port,
				const struct switchdev_obj_port_mdb *mdb);
	/*
	 * RXNFC
	 */
	int	(*get_rxnfc)(struct dsa_switch *ds, int port,
			     struct ethtool_rxnfc *nfc, u32 *rule_locs);
	int	(*set_rxnfc)(struct dsa_switch *ds, int port,
			     struct ethtool_rxnfc *nfc);

	/*
	 * TC integration
	 */
	int	(*port_mirror_add)(struct dsa_switch *ds, int port,
				   struct dsa_mall_mirror_tc_entry *mirror,
				   bool ingress);
	void	(*port_mirror_del)(struct dsa_switch *ds, int port,
				   struct dsa_mall_mirror_tc_entry *mirror);

	/*
	 * Cross-chip operations
	 */
	int	(*crosschip_bridge_join)(struct dsa_switch *ds, int sw_index,
					 int port, struct net_device *br);
	void	(*crosschip_bridge_leave)(struct dsa_switch *ds, int sw_index,
					  int port, struct net_device *br);
};

struct dsa_switch_driver {
	struct list_head	list;
	const struct dsa_switch_ops *ops;
};

#if IS_ENABLED(CONFIG_NET_DSA_LEGACY)
/* Legacy driver registration */
void register_switch_driver(struct dsa_switch_driver *type);
void unregister_switch_driver(struct dsa_switch_driver *type);
struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev);

#else
static inline void register_switch_driver(struct dsa_switch_driver *type) { }
static inline void unregister_switch_driver(struct dsa_switch_driver *type) { }
static inline struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
{
	return NULL;
}
#endif
struct net_device *dsa_dev_to_net_device(struct device *dev);

/* Keep inline for faster access in hot path */
static inline bool netdev_uses_dsa(struct net_device *dev)
{
#if IS_ENABLED(CONFIG_NET_DSA)
	return dev->dsa_ptr && dev->dsa_ptr->rcv;
#endif
	return false;
}

struct dsa_switch *dsa_switch_alloc(struct device *dev, size_t n);
void dsa_unregister_switch(struct dsa_switch *ds);
int dsa_register_switch(struct dsa_switch *ds);
#ifdef CONFIG_PM_SLEEP
int dsa_switch_suspend(struct dsa_switch *ds);
int dsa_switch_resume(struct dsa_switch *ds);
#else
static inline int dsa_switch_suspend(struct dsa_switch *ds)
{
	return 0;
}
static inline int dsa_switch_resume(struct dsa_switch *ds)
{
	return 0;
}
#endif /* CONFIG_PM_SLEEP */

enum dsa_notifier_type {
	DSA_PORT_REGISTER,
	DSA_PORT_UNREGISTER,
};

struct dsa_notifier_info {
	struct net_device *dev;
};

struct dsa_notifier_register_info {
	struct dsa_notifier_info info;	/* must be first */
	struct net_device *master;
	unsigned int port_number;
	unsigned int switch_number;
};

static inline struct net_device *
dsa_notifier_info_to_dev(const struct dsa_notifier_info *info)
{
	return info->dev;
}

#if IS_ENABLED(CONFIG_NET_DSA)
int register_dsa_notifier(struct notifier_block *nb);
int unregister_dsa_notifier(struct notifier_block *nb);
int call_dsa_notifiers(unsigned long val, struct net_device *dev,
		       struct dsa_notifier_info *info);
#else
static inline int register_dsa_notifier(struct notifier_block *nb)
{
	return 0;
}

static inline int unregister_dsa_notifier(struct notifier_block *nb)
{
	return 0;
}

static inline int call_dsa_notifiers(unsigned long val, struct net_device *dev,
				     struct dsa_notifier_info *info)
{
	return NOTIFY_DONE;
}
#endif

/* Broadcom tag specific helpers to insert and extract queue/port number */
#define BRCM_TAG_SET_PORT_QUEUE(p, q)	((p) << 8 | q)
#define BRCM_TAG_GET_PORT(v)		((v) >> 8)
#define BRCM_TAG_GET_QUEUE(v)		((v) & 0xff)

#endif