summaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c
blob: baa3a30c039f49a1960d835ad356fdddac8cb1b6 (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
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
// SPDX-License-Identifier: GPL-2.0+

#include <net/switchdev.h>
#include "lan966x_main.h"

#define LAN966X_MAC_COLUMNS		4
#define MACACCESS_CMD_IDLE		0
#define MACACCESS_CMD_LEARN		1
#define MACACCESS_CMD_FORGET		2
#define MACACCESS_CMD_AGE		3
#define MACACCESS_CMD_GET_NEXT		4
#define MACACCESS_CMD_INIT		5
#define MACACCESS_CMD_READ		6
#define MACACCESS_CMD_WRITE		7
#define MACACCESS_CMD_SYNC_GET_NEXT	8

#define LAN966X_MAC_INVALID_ROW		-1

struct lan966x_mac_entry {
	struct list_head list;
	unsigned char mac[ETH_ALEN] __aligned(2);
	u16 vid;
	u16 port_index;
	int row;
	bool lag;
};

struct lan966x_mac_raw_entry {
	u32 mach;
	u32 macl;
	u32 maca;
	bool processed;
};

static int lan966x_mac_get_status(struct lan966x *lan966x)
{
	return lan_rd(lan966x, ANA_MACACCESS);
}

static int lan966x_mac_wait_for_completion(struct lan966x *lan966x)
{
	u32 val;

	return readx_poll_timeout_atomic(lan966x_mac_get_status,
					 lan966x, val,
					 (ANA_MACACCESS_MAC_TABLE_CMD_GET(val)) ==
					 MACACCESS_CMD_IDLE,
					 TABLE_UPDATE_SLEEP_US,
					 TABLE_UPDATE_TIMEOUT_US);
}

static void lan966x_mac_select(struct lan966x *lan966x,
			       const unsigned char mac[ETH_ALEN],
			       unsigned int vid)
{
	u32 macl = 0, mach = 0;

	/* Set the MAC address to handle and the vlan associated in a format
	 * understood by the hardware.
	 */
	mach |= vid    << 16;
	mach |= mac[0] << 8;
	mach |= mac[1] << 0;
	macl |= mac[2] << 24;
	macl |= mac[3] << 16;
	macl |= mac[4] << 8;
	macl |= mac[5] << 0;

	lan_wr(macl, lan966x, ANA_MACLDATA);
	lan_wr(mach, lan966x, ANA_MACHDATA);
}

static int __lan966x_mac_learn_locked(struct lan966x *lan966x, int pgid,
				      bool cpu_copy,
				      const unsigned char mac[ETH_ALEN],
				      unsigned int vid,
				      enum macaccess_entry_type type)
{
	lockdep_assert_held(&lan966x->mac_lock);

	lan966x_mac_select(lan966x, mac, vid);

	/* Issue a write command */
	lan_wr(ANA_MACACCESS_VALID_SET(1) |
	       ANA_MACACCESS_CHANGE2SW_SET(0) |
	       ANA_MACACCESS_MAC_CPU_COPY_SET(cpu_copy) |
	       ANA_MACACCESS_DEST_IDX_SET(pgid) |
	       ANA_MACACCESS_ENTRYTYPE_SET(type) |
	       ANA_MACACCESS_MAC_TABLE_CMD_SET(MACACCESS_CMD_LEARN),
	       lan966x, ANA_MACACCESS);

	return lan966x_mac_wait_for_completion(lan966x);
}

static int __lan966x_mac_learn(struct lan966x *lan966x, int pgid,
			       bool cpu_copy,
			       const unsigned char mac[ETH_ALEN],
			       unsigned int vid,
			       enum macaccess_entry_type type)
{
	int ret;

	spin_lock(&lan966x->mac_lock);
	ret = __lan966x_mac_learn_locked(lan966x, pgid, cpu_copy, mac, vid, type);
	spin_unlock(&lan966x->mac_lock);

	return ret;
}

/* The mask of the front ports is encoded inside the mac parameter via a call
 * to lan966x_mdb_encode_mac().
 */
int lan966x_mac_ip_learn(struct lan966x *lan966x,
			 bool cpu_copy,
			 const unsigned char mac[ETH_ALEN],
			 unsigned int vid,
			 enum macaccess_entry_type type)
{
	WARN_ON(type != ENTRYTYPE_MACV4 && type != ENTRYTYPE_MACV6);

	return __lan966x_mac_learn(lan966x, 0, cpu_copy, mac, vid, type);
}

int lan966x_mac_learn(struct lan966x *lan966x, int port,
		      const unsigned char mac[ETH_ALEN],
		      unsigned int vid,
		      enum macaccess_entry_type type)
{
	WARN_ON(type != ENTRYTYPE_NORMAL && type != ENTRYTYPE_LOCKED);

	return __lan966x_mac_learn(lan966x, port, false, mac, vid, type);
}

static int lan966x_mac_learn_locked(struct lan966x *lan966x, int port,
				    const unsigned char mac[ETH_ALEN],
				    unsigned int vid,
				    enum macaccess_entry_type type)
{
	WARN_ON(type != ENTRYTYPE_NORMAL && type != ENTRYTYPE_LOCKED);

	return __lan966x_mac_learn_locked(lan966x, port, false, mac, vid, type);
}

static int lan966x_mac_forget_locked(struct lan966x *lan966x,
				     const unsigned char mac[ETH_ALEN],
				     unsigned int vid,
				     enum macaccess_entry_type type)
{
	lockdep_assert_held(&lan966x->mac_lock);

	lan966x_mac_select(lan966x, mac, vid);

	/* Issue a forget command */
	lan_wr(ANA_MACACCESS_ENTRYTYPE_SET(type) |
	       ANA_MACACCESS_MAC_TABLE_CMD_SET(MACACCESS_CMD_FORGET),
	       lan966x, ANA_MACACCESS);

	return lan966x_mac_wait_for_completion(lan966x);
}

int lan966x_mac_forget(struct lan966x *lan966x,
		       const unsigned char mac[ETH_ALEN],
		       unsigned int vid,
		       enum macaccess_entry_type type)
{
	int ret;

	spin_lock(&lan966x->mac_lock);
	ret = lan966x_mac_forget_locked(lan966x, mac, vid, type);
	spin_unlock(&lan966x->mac_lock);

	return ret;
}

int lan966x_mac_cpu_learn(struct lan966x *lan966x, const char *addr, u16 vid)
{
	return lan966x_mac_learn(lan966x, PGID_CPU, addr, vid, ENTRYTYPE_LOCKED);
}

int lan966x_mac_cpu_forget(struct lan966x *lan966x, const char *addr, u16 vid)
{
	return lan966x_mac_forget(lan966x, addr, vid, ENTRYTYPE_LOCKED);
}

void lan966x_mac_set_ageing(struct lan966x *lan966x,
			    u32 ageing)
{
	lan_rmw(ANA_AUTOAGE_AGE_PERIOD_SET(ageing / 2),
		ANA_AUTOAGE_AGE_PERIOD,
		lan966x, ANA_AUTOAGE);
}

void lan966x_mac_init(struct lan966x *lan966x)
{
	/* Clear the MAC table */
	lan_wr(MACACCESS_CMD_INIT, lan966x, ANA_MACACCESS);
	lan966x_mac_wait_for_completion(lan966x);

	spin_lock_init(&lan966x->mac_lock);
	INIT_LIST_HEAD(&lan966x->mac_entries);
}

static struct lan966x_mac_entry *lan966x_mac_alloc_entry(struct lan966x_port *port,
							 const unsigned char *mac,
							 u16 vid)
{
	struct lan966x_mac_entry *mac_entry;

	mac_entry = kzalloc(sizeof(*mac_entry), GFP_ATOMIC);
	if (!mac_entry)
		return NULL;

	memcpy(mac_entry->mac, mac, ETH_ALEN);
	mac_entry->vid = vid;
	mac_entry->port_index = port->chip_port;
	mac_entry->row = LAN966X_MAC_INVALID_ROW;
	mac_entry->lag = port->bond ? true : false;
	return mac_entry;
}

static struct lan966x_mac_entry *lan966x_mac_find_entry(struct lan966x *lan966x,
							const unsigned char *mac,
							u16 vid, u16 port_index)
{
	struct lan966x_mac_entry *res = NULL;
	struct lan966x_mac_entry *mac_entry;

	list_for_each_entry(mac_entry, &lan966x->mac_entries, list) {
		if (mac_entry->vid == vid &&
		    ether_addr_equal(mac, mac_entry->mac) &&
		    mac_entry->port_index == port_index) {
			res = mac_entry;
			break;
		}
	}

	return res;
}

static int lan966x_mac_lookup(struct lan966x *lan966x,
			      const unsigned char mac[ETH_ALEN],
			      unsigned int vid, enum macaccess_entry_type type)
{
	int ret;

	lan966x_mac_select(lan966x, mac, vid);

	/* Issue a read command */
	lan_wr(ANA_MACACCESS_ENTRYTYPE_SET(type) |
	       ANA_MACACCESS_VALID_SET(1) |
	       ANA_MACACCESS_MAC_TABLE_CMD_SET(MACACCESS_CMD_READ),
	       lan966x, ANA_MACACCESS);

	ret = lan966x_mac_wait_for_completion(lan966x);
	if (ret)
		return ret;

	return ANA_MACACCESS_VALID_GET(lan_rd(lan966x, ANA_MACACCESS));
}

static void lan966x_fdb_call_notifiers(enum switchdev_notifier_type type,
				       const char *mac, u16 vid,
				       struct net_device *dev)
{
	struct switchdev_notifier_fdb_info info = { 0 };

	info.addr = mac;
	info.vid = vid;
	info.offloaded = true;
	call_switchdev_notifiers(type, dev, &info.info, NULL);
}

int lan966x_mac_add_entry(struct lan966x *lan966x, struct lan966x_port *port,
			  const unsigned char *addr, u16 vid)
{
	struct lan966x_mac_entry *mac_entry;

	spin_lock(&lan966x->mac_lock);
	if (lan966x_mac_lookup(lan966x, addr, vid, ENTRYTYPE_NORMAL)) {
		spin_unlock(&lan966x->mac_lock);
		return 0;
	}

	/* In case the entry already exists, don't add it again to SW,
	 * just update HW, but we need to look in the actual HW because
	 * it is possible for an entry to be learn by HW and before we
	 * get the interrupt the frame will reach CPU and the CPU will
	 * add the entry but without the extern_learn flag.
	 */
	mac_entry = lan966x_mac_find_entry(lan966x, addr, vid, port->chip_port);
	if (mac_entry) {
		spin_unlock(&lan966x->mac_lock);
		goto mac_learn;
	}

	mac_entry = lan966x_mac_alloc_entry(port, addr, vid);
	if (!mac_entry) {
		spin_unlock(&lan966x->mac_lock);
		return -ENOMEM;
	}

	list_add_tail(&mac_entry->list, &lan966x->mac_entries);
	spin_unlock(&lan966x->mac_lock);

	lan966x_fdb_call_notifiers(SWITCHDEV_FDB_OFFLOADED, addr, vid,
				   port->bond ?: port->dev);

mac_learn:
	lan966x_mac_learn(lan966x, port->chip_port, addr, vid, ENTRYTYPE_LOCKED);

	return 0;
}

int lan966x_mac_del_entry(struct lan966x *lan966x, const unsigned char *addr,
			  u16 vid)
{
	struct lan966x_mac_entry *mac_entry, *tmp;

	spin_lock(&lan966x->mac_lock);
	list_for_each_entry_safe(mac_entry, tmp, &lan966x->mac_entries,
				 list) {
		if (mac_entry->vid == vid &&
		    ether_addr_equal(addr, mac_entry->mac)) {
			lan966x_mac_forget_locked(lan966x, mac_entry->mac,
						  mac_entry->vid,
						  ENTRYTYPE_LOCKED);

			list_del(&mac_entry->list);
			kfree(mac_entry);
		}
	}
	spin_unlock(&lan966x->mac_lock);

	return 0;
}

void lan966x_mac_lag_replace_port_entry(struct lan966x *lan966x,
					struct lan966x_port *src,
					struct lan966x_port *dst)
{
	struct lan966x_mac_entry *mac_entry;

	spin_lock(&lan966x->mac_lock);
	list_for_each_entry(mac_entry, &lan966x->mac_entries, list) {
		if (mac_entry->port_index == src->chip_port &&
		    mac_entry->lag) {
			lan966x_mac_forget_locked(lan966x, mac_entry->mac,
						  mac_entry->vid,
						  ENTRYTYPE_LOCKED);

			lan966x_mac_learn_locked(lan966x, dst->chip_port,
						 mac_entry->mac, mac_entry->vid,
						 ENTRYTYPE_LOCKED);
			mac_entry->port_index = dst->chip_port;
		}
	}
	spin_unlock(&lan966x->mac_lock);
}

void lan966x_mac_lag_remove_port_entry(struct lan966x *lan966x,
				       struct lan966x_port *src)
{
	struct lan966x_mac_entry *mac_entry, *tmp;

	spin_lock(&lan966x->mac_lock);
	list_for_each_entry_safe(mac_entry, tmp, &lan966x->mac_entries,
				 list) {
		if (mac_entry->port_index == src->chip_port &&
		    mac_entry->lag) {
			lan966x_mac_forget_locked(lan966x, mac_entry->mac,
						  mac_entry->vid,
						  ENTRYTYPE_LOCKED);

			list_del(&mac_entry->list);
			kfree(mac_entry);
		}
	}
	spin_unlock(&lan966x->mac_lock);
}

void lan966x_mac_purge_entries(struct lan966x *lan966x)
{
	struct lan966x_mac_entry *mac_entry, *tmp;

	spin_lock(&lan966x->mac_lock);
	list_for_each_entry_safe(mac_entry, tmp, &lan966x->mac_entries,
				 list) {
		lan966x_mac_forget_locked(lan966x, mac_entry->mac,
					  mac_entry->vid, ENTRYTYPE_LOCKED);

		list_del(&mac_entry->list);
		kfree(mac_entry);
	}
	spin_unlock(&lan966x->mac_lock);
}

static void lan966x_mac_notifiers(enum switchdev_notifier_type type,
				  unsigned char *mac, u32 vid,
				  struct net_device *dev)
{
	rtnl_lock();
	lan966x_fdb_call_notifiers(type, mac, vid, dev);
	rtnl_unlock();
}

static void lan966x_mac_process_raw_entry(struct lan966x_mac_raw_entry *raw_entry,
					  u8 *mac, u16 *vid, u32 *dest_idx)
{
	mac[0] = (raw_entry->mach >> 8)  & 0xff;
	mac[1] = (raw_entry->mach >> 0)  & 0xff;
	mac[2] = (raw_entry->macl >> 24) & 0xff;
	mac[3] = (raw_entry->macl >> 16) & 0xff;
	mac[4] = (raw_entry->macl >> 8)  & 0xff;
	mac[5] = (raw_entry->macl >> 0)  & 0xff;

	*vid = (raw_entry->mach >> 16) & 0xfff;
	*dest_idx = ANA_MACACCESS_DEST_IDX_GET(raw_entry->maca);
}

static void lan966x_mac_irq_process(struct lan966x *lan966x, u32 row,
				    struct lan966x_mac_raw_entry *raw_entries)
{
	struct lan966x_mac_entry *mac_entry, *tmp;
	unsigned char mac[ETH_ALEN] __aligned(2);
	struct list_head mac_deleted_entries;
	struct lan966x_port *port;
	u32 dest_idx;
	u32 column;
	u16 vid;

	INIT_LIST_HEAD(&mac_deleted_entries);

	spin_lock(&lan966x->mac_lock);
	list_for_each_entry_safe(mac_entry, tmp, &lan966x->mac_entries, list) {
		bool found = false;

		if (mac_entry->row != row)
			continue;

		for (column = 0; column < LAN966X_MAC_COLUMNS; ++column) {
			/* All the valid entries are at the start of the row,
			 * so when get one invalid entry it can just skip the
			 * rest of the columns
			 */
			if (!ANA_MACACCESS_VALID_GET(raw_entries[column].maca))
				break;

			lan966x_mac_process_raw_entry(&raw_entries[column],
						      mac, &vid, &dest_idx);
			if (WARN_ON(dest_idx >= lan966x->num_phys_ports))
				continue;

			/* If the entry in SW is found, then there is nothing
			 * to do
			 */
			if (mac_entry->vid == vid &&
			    ether_addr_equal(mac_entry->mac, mac) &&
			    mac_entry->port_index == dest_idx) {
				raw_entries[column].processed = true;
				found = true;
				break;
			}
		}

		if (!found) {
			list_del(&mac_entry->list);
			/* Move the entry from SW list to a tmp list such that
			 * it would be deleted later
			 */
			list_add_tail(&mac_entry->list, &mac_deleted_entries);
		}
	}
	spin_unlock(&lan966x->mac_lock);

	list_for_each_entry_safe(mac_entry, tmp, &mac_deleted_entries, list) {
		/* Notify the bridge that the entry doesn't exist
		 * anymore in the HW
		 */
		port = lan966x->ports[mac_entry->port_index];
		lan966x_mac_notifiers(SWITCHDEV_FDB_DEL_TO_BRIDGE,
				      mac_entry->mac, mac_entry->vid,
				      port->bond ?: port->dev);
		list_del(&mac_entry->list);
		kfree(mac_entry);
	}

	/* Now go to the list of columns and see if any entry was not in the SW
	 * list, then that means that the entry is new so it needs to notify the
	 * bridge.
	 */
	for (column = 0; column < LAN966X_MAC_COLUMNS; ++column) {
		/* All the valid entries are at the start of the row, so when
		 * get one invalid entry it can just skip the rest of the columns
		 */
		if (!ANA_MACACCESS_VALID_GET(raw_entries[column].maca))
			break;

		/* If the entry already exists then don't do anything */
		if (raw_entries[column].processed)
			continue;

		lan966x_mac_process_raw_entry(&raw_entries[column],
					      mac, &vid, &dest_idx);
		if (WARN_ON(dest_idx >= lan966x->num_phys_ports))
			continue;

		spin_lock(&lan966x->mac_lock);
		mac_entry = lan966x_mac_find_entry(lan966x, mac, vid, dest_idx);
		if (mac_entry) {
			spin_unlock(&lan966x->mac_lock);
			continue;
		}

		port = lan966x->ports[dest_idx];
		mac_entry = lan966x_mac_alloc_entry(port, mac, vid);
		if (!mac_entry) {
			spin_unlock(&lan966x->mac_lock);
			return;
		}

		mac_entry->row = row;
		list_add_tail(&mac_entry->list, &lan966x->mac_entries);
		spin_unlock(&lan966x->mac_lock);

		lan966x_mac_notifiers(SWITCHDEV_FDB_ADD_TO_BRIDGE,
				      mac, vid, port->bond ?: port->dev);
	}
}

irqreturn_t lan966x_mac_irq_handler(struct lan966x *lan966x)
{
	struct lan966x_mac_raw_entry entry[LAN966X_MAC_COLUMNS] = { 0 };
	u32 index, column;
	bool stop = true;
	u32 val;

	/* Start the scan from 0, 0 */
	lan_wr(ANA_MACTINDX_M_INDEX_SET(0) |
	       ANA_MACTINDX_BUCKET_SET(0),
	       lan966x, ANA_MACTINDX);

	while (1) {
		spin_lock(&lan966x->mac_lock);
		lan_rmw(ANA_MACACCESS_MAC_TABLE_CMD_SET(MACACCESS_CMD_SYNC_GET_NEXT),
			ANA_MACACCESS_MAC_TABLE_CMD,
			lan966x, ANA_MACACCESS);
		lan966x_mac_wait_for_completion(lan966x);

		val = lan_rd(lan966x, ANA_MACTINDX);
		index = ANA_MACTINDX_M_INDEX_GET(val);
		column = ANA_MACTINDX_BUCKET_GET(val);

		/* The SYNC-GET-NEXT returns all the entries(4) in a row in
		 * which is suffered a change. By change it means that new entry
		 * was added or an entry was removed because of ageing.
		 * It would return all the columns for that row. And after that
		 * it would return the next row The stop conditions of the
		 * SYNC-GET-NEXT is when it reaches 'directly' to row 0
		 * column 3. So if SYNC-GET-NEXT returns row 0 and column 0
		 * then it is required to continue to read more even if it
		 * reaches row 0 and column 3.
		 */
		if (index == 0 && column == 0)
			stop = false;

		if (column == LAN966X_MAC_COLUMNS - 1 &&
		    index == 0 && stop) {
			spin_unlock(&lan966x->mac_lock);
			break;
		}

		entry[column].mach = lan_rd(lan966x, ANA_MACHDATA);
		entry[column].macl = lan_rd(lan966x, ANA_MACLDATA);
		entry[column].maca = lan_rd(lan966x, ANA_MACACCESS);
		spin_unlock(&lan966x->mac_lock);

		/* Once all the columns are read process them */
		if (column == LAN966X_MAC_COLUMNS - 1) {
			lan966x_mac_irq_process(lan966x, index, entry);
			/* A row was processed so it is safe to assume that the
			 * next row/column can be the stop condition
			 */
			stop = true;
		}
	}

	lan_rmw(ANA_ANAINTR_INTR_SET(0),
		ANA_ANAINTR_INTR,
		lan966x, ANA_ANAINTR);

	return IRQ_HANDLED;
}