summaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/mellanox/mlx5/core/lag.c
blob: 55957246c0e844826a5a7f18c42c4678fb6c5be5 (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
/*
 * Copyright (c) 2016, Mellanox Technologies. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/netdevice.h>
#include <linux/mlx5/driver.h>
#include <linux/mlx5/vport.h>
#include "mlx5_core.h"

enum {
	MLX5_LAG_FLAG_BONDED = 1 << 0,
};

struct lag_func {
	struct mlx5_core_dev *dev;
	struct net_device    *netdev;
};

/* Used for collection of netdev event info. */
struct lag_tracker {
	enum   netdev_lag_tx_type           tx_type;
	struct netdev_lag_lower_state_info  netdev_state[MLX5_MAX_PORTS];
	bool is_bonded;
};

/* LAG data of a ConnectX card.
 * It serves both its phys functions.
 */
struct mlx5_lag {
	u8                        flags;
	u8                        v2p_map[MLX5_MAX_PORTS];
	struct lag_func           pf[MLX5_MAX_PORTS];
	struct lag_tracker        tracker;
	struct delayed_work       bond_work;
	struct notifier_block     nb;
};

/* General purpose, use for short periods of time.
 * Beware of lock dependencies (preferably, no locks should be acquired
 * under it).
 */
static DEFINE_MUTEX(lag_mutex);

static int mlx5_cmd_create_lag(struct mlx5_core_dev *dev, u8 remap_port1,
			       u8 remap_port2)
{
	u32   in[MLX5_ST_SZ_DW(create_lag_in)]   = {0};
	u32   out[MLX5_ST_SZ_DW(create_lag_out)] = {0};
	void *lag_ctx = MLX5_ADDR_OF(create_lag_in, in, ctx);

	MLX5_SET(create_lag_in, in, opcode, MLX5_CMD_OP_CREATE_LAG);

	MLX5_SET(lagc, lag_ctx, tx_remap_affinity_1, remap_port1);
	MLX5_SET(lagc, lag_ctx, tx_remap_affinity_2, remap_port2);

	return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
}

static int mlx5_cmd_modify_lag(struct mlx5_core_dev *dev, u8 remap_port1,
			       u8 remap_port2)
{
	u32   in[MLX5_ST_SZ_DW(modify_lag_in)]   = {0};
	u32   out[MLX5_ST_SZ_DW(modify_lag_out)] = {0};
	void *lag_ctx = MLX5_ADDR_OF(modify_lag_in, in, ctx);

	MLX5_SET(modify_lag_in, in, opcode, MLX5_CMD_OP_MODIFY_LAG);
	MLX5_SET(modify_lag_in, in, field_select, 0x1);

	MLX5_SET(lagc, lag_ctx, tx_remap_affinity_1, remap_port1);
	MLX5_SET(lagc, lag_ctx, tx_remap_affinity_2, remap_port2);

	return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
}

static int mlx5_cmd_destroy_lag(struct mlx5_core_dev *dev)
{
	u32  in[MLX5_ST_SZ_DW(destroy_lag_in)]  = {0};
	u32 out[MLX5_ST_SZ_DW(destroy_lag_out)] = {0};

	MLX5_SET(destroy_lag_in, in, opcode, MLX5_CMD_OP_DESTROY_LAG);

	return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
}

int mlx5_cmd_create_vport_lag(struct mlx5_core_dev *dev)
{
	u32  in[MLX5_ST_SZ_DW(create_vport_lag_in)]  = {0};
	u32 out[MLX5_ST_SZ_DW(create_vport_lag_out)] = {0};

	MLX5_SET(create_vport_lag_in, in, opcode, MLX5_CMD_OP_CREATE_VPORT_LAG);

	return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
}
EXPORT_SYMBOL(mlx5_cmd_create_vport_lag);

int mlx5_cmd_destroy_vport_lag(struct mlx5_core_dev *dev)
{
	u32  in[MLX5_ST_SZ_DW(destroy_vport_lag_in)]  = {0};
	u32 out[MLX5_ST_SZ_DW(destroy_vport_lag_out)] = {0};

	MLX5_SET(destroy_vport_lag_in, in, opcode, MLX5_CMD_OP_DESTROY_VPORT_LAG);

	return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
}
EXPORT_SYMBOL(mlx5_cmd_destroy_vport_lag);

static struct mlx5_lag *mlx5_lag_dev_get(struct mlx5_core_dev *dev)
{
	return dev->priv.lag;
}

static int mlx5_lag_dev_get_netdev_idx(struct mlx5_lag *ldev,
				       struct net_device *ndev)
{
	int i;

	for (i = 0; i < MLX5_MAX_PORTS; i++)
		if (ldev->pf[i].netdev == ndev)
			return i;

	return -1;
}

static bool mlx5_lag_is_bonded(struct mlx5_lag *ldev)
{
	return !!(ldev->flags & MLX5_LAG_FLAG_BONDED);
}

static void mlx5_infer_tx_affinity_mapping(struct lag_tracker *tracker,
					   u8 *port1, u8 *port2)
{
	if (tracker->tx_type == NETDEV_LAG_TX_TYPE_ACTIVEBACKUP) {
		if (tracker->netdev_state[0].tx_enabled) {
			*port1 = 1;
			*port2 = 1;
		} else {
			*port1 = 2;
			*port2 = 2;
		}
	} else {
		*port1 = 1;
		*port2 = 2;
		if (!tracker->netdev_state[0].link_up)
			*port1 = 2;
		else if (!tracker->netdev_state[1].link_up)
			*port2 = 1;
	}
}

static void mlx5_activate_lag(struct mlx5_lag *ldev,
			      struct lag_tracker *tracker)
{
	struct mlx5_core_dev *dev0 = ldev->pf[0].dev;
	int err;

	ldev->flags |= MLX5_LAG_FLAG_BONDED;

	mlx5_infer_tx_affinity_mapping(tracker, &ldev->v2p_map[0],
				       &ldev->v2p_map[1]);

	err = mlx5_cmd_create_lag(dev0, ldev->v2p_map[0], ldev->v2p_map[1]);
	if (err)
		mlx5_core_err(dev0,
			      "Failed to create LAG (%d)\n",
			      err);
}

static void mlx5_deactivate_lag(struct mlx5_lag *ldev)
{
	struct mlx5_core_dev *dev0 = ldev->pf[0].dev;
	int err;

	ldev->flags &= ~MLX5_LAG_FLAG_BONDED;

	err = mlx5_cmd_destroy_lag(dev0);
	if (err)
		mlx5_core_err(dev0,
			      "Failed to destroy LAG (%d)\n",
			      err);
}

static void mlx5_do_bond(struct mlx5_lag *ldev)
{
	struct mlx5_core_dev *dev0 = ldev->pf[0].dev;
	struct mlx5_core_dev *dev1 = ldev->pf[1].dev;
	struct lag_tracker tracker;
	u8 v2p_port1, v2p_port2;
	int i, err;

	if (!dev0 || !dev1)
		return;

	mutex_lock(&lag_mutex);
	tracker = ldev->tracker;
	mutex_unlock(&lag_mutex);

	if (tracker.is_bonded && !mlx5_lag_is_bonded(ldev)) {
		if (mlx5_sriov_is_enabled(dev0) ||
		    mlx5_sriov_is_enabled(dev1)) {
			mlx5_core_warn(dev0, "LAG is not supported with SRIOV");
			return;
		}

		for (i = 0; i < MLX5_MAX_PORTS; i++)
			mlx5_remove_dev_by_protocol(ldev->pf[i].dev,
						    MLX5_INTERFACE_PROTOCOL_IB);

		mlx5_activate_lag(ldev, &tracker);

		mlx5_add_dev_by_protocol(dev0, MLX5_INTERFACE_PROTOCOL_IB);
		mlx5_nic_vport_enable_roce(dev1);
	} else if (tracker.is_bonded && mlx5_lag_is_bonded(ldev)) {
		mlx5_infer_tx_affinity_mapping(&tracker, &v2p_port1,
					       &v2p_port2);

		if ((v2p_port1 != ldev->v2p_map[0]) ||
		    (v2p_port2 != ldev->v2p_map[1])) {
			ldev->v2p_map[0] = v2p_port1;
			ldev->v2p_map[1] = v2p_port2;

			err = mlx5_cmd_modify_lag(dev0, v2p_port1, v2p_port2);
			if (err)
				mlx5_core_err(dev0,
					      "Failed to modify LAG (%d)\n",
					      err);
		}
	} else if (!tracker.is_bonded && mlx5_lag_is_bonded(ldev)) {
		mlx5_remove_dev_by_protocol(dev0, MLX5_INTERFACE_PROTOCOL_IB);
		mlx5_nic_vport_disable_roce(dev1);

		mlx5_deactivate_lag(ldev);

		for (i = 0; i < MLX5_MAX_PORTS; i++)
			if (ldev->pf[i].dev)
				mlx5_add_dev_by_protocol(ldev->pf[i].dev,
							 MLX5_INTERFACE_PROTOCOL_IB);
	}
}

static void mlx5_queue_bond_work(struct mlx5_lag *ldev, unsigned long delay)
{
	schedule_delayed_work(&ldev->bond_work, delay);
}

static void mlx5_do_bond_work(struct work_struct *work)
{
	struct delayed_work *delayed_work = to_delayed_work(work);
	struct mlx5_lag *ldev = container_of(delayed_work, struct mlx5_lag,
					     bond_work);
	int status;

	status = mlx5_dev_list_trylock();
	if (!status) {
		/* 1 sec delay. */
		mlx5_queue_bond_work(ldev, HZ);
		return;
	}

	mlx5_do_bond(ldev);
	mlx5_dev_list_unlock();
}

static int mlx5_handle_changeupper_event(struct mlx5_lag *ldev,
					 struct lag_tracker *tracker,
					 struct net_device *ndev,
					 struct netdev_notifier_changeupper_info *info)
{
	struct net_device *upper = info->upper_dev, *ndev_tmp;
	struct netdev_lag_upper_info *lag_upper_info;
	bool is_bonded;
	int bond_status = 0;
	int num_slaves = 0;
	int idx;

	if (!netif_is_lag_master(upper))
		return 0;

	lag_upper_info = info->upper_info;

	/* The event may still be of interest if the slave does not belong to
	 * us, but is enslaved to a master which has one or more of our netdevs
	 * as slaves (e.g., if a new slave is added to a master that bonds two
	 * of our netdevs, we should unbond).
	 */
	rcu_read_lock();
	for_each_netdev_in_bond_rcu(upper, ndev_tmp) {
		idx = mlx5_lag_dev_get_netdev_idx(ldev, ndev_tmp);
		if (idx > -1)
			bond_status |= (1 << idx);

		num_slaves++;
	}
	rcu_read_unlock();

	/* None of this lagdev's netdevs are slaves of this master. */
	if (!(bond_status & 0x3))
		return 0;

	if (lag_upper_info)
		tracker->tx_type = lag_upper_info->tx_type;

	/* Determine bonding status:
	 * A device is considered bonded if both its physical ports are slaves
	 * of the same lag master, and only them.
	 * Lag mode must be activebackup or hash.
	 */
	is_bonded = (num_slaves == MLX5_MAX_PORTS) &&
		    (bond_status == 0x3) &&
		    ((tracker->tx_type == NETDEV_LAG_TX_TYPE_ACTIVEBACKUP) ||
		     (tracker->tx_type == NETDEV_LAG_TX_TYPE_HASH));

	if (tracker->is_bonded != is_bonded) {
		tracker->is_bonded = is_bonded;
		return 1;
	}

	return 0;
}

static int mlx5_handle_changelowerstate_event(struct mlx5_lag *ldev,
					      struct lag_tracker *tracker,
					      struct net_device *ndev,
					      struct netdev_notifier_changelowerstate_info *info)
{
	struct netdev_lag_lower_state_info *lag_lower_info;
	int idx;

	if (!netif_is_lag_port(ndev))
		return 0;

	idx = mlx5_lag_dev_get_netdev_idx(ldev, ndev);
	if (idx == -1)
		return 0;

	/* This information is used to determine virtual to physical
	 * port mapping.
	 */
	lag_lower_info = info->lower_state_info;
	if (!lag_lower_info)
		return 0;

	tracker->netdev_state[idx] = *lag_lower_info;

	return 1;
}

static int mlx5_lag_netdev_event(struct notifier_block *this,
				 unsigned long event, void *ptr)
{
	struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
	struct lag_tracker tracker;
	struct mlx5_lag *ldev;
	int changed = 0;

	if (!net_eq(dev_net(ndev), &init_net))
		return NOTIFY_DONE;

	if ((event != NETDEV_CHANGEUPPER) && (event != NETDEV_CHANGELOWERSTATE))
		return NOTIFY_DONE;

	ldev    = container_of(this, struct mlx5_lag, nb);
	tracker = ldev->tracker;

	switch (event) {
	case NETDEV_CHANGEUPPER:
		changed = mlx5_handle_changeupper_event(ldev, &tracker, ndev,
							ptr);
		break;
	case NETDEV_CHANGELOWERSTATE:
		changed = mlx5_handle_changelowerstate_event(ldev, &tracker,
							     ndev, ptr);
		break;
	}

	mutex_lock(&lag_mutex);
	ldev->tracker = tracker;
	mutex_unlock(&lag_mutex);

	if (changed)
		mlx5_queue_bond_work(ldev, 0);

	return NOTIFY_DONE;
}

static struct mlx5_lag *mlx5_lag_dev_alloc(void)
{
	struct mlx5_lag *ldev;

	ldev = kzalloc(sizeof(*ldev), GFP_KERNEL);
	if (!ldev)
		return NULL;

	INIT_DELAYED_WORK(&ldev->bond_work, mlx5_do_bond_work);

	return ldev;
}

static void mlx5_lag_dev_free(struct mlx5_lag *ldev)
{
	kfree(ldev);
}

static void mlx5_lag_dev_add_pf(struct mlx5_lag *ldev,
				struct mlx5_core_dev *dev,
				struct net_device *netdev)
{
	unsigned int fn = PCI_FUNC(dev->pdev->devfn);

	if (fn >= MLX5_MAX_PORTS)
		return;

	mutex_lock(&lag_mutex);
	ldev->pf[fn].dev    = dev;
	ldev->pf[fn].netdev = netdev;
	ldev->tracker.netdev_state[fn].link_up = 0;
	ldev->tracker.netdev_state[fn].tx_enabled = 0;

	dev->priv.lag = ldev;
	mutex_unlock(&lag_mutex);
}

static void mlx5_lag_dev_remove_pf(struct mlx5_lag *ldev,
				   struct mlx5_core_dev *dev)
{
	int i;

	for (i = 0; i < MLX5_MAX_PORTS; i++)
		if (ldev->pf[i].dev == dev)
			break;

	if (i == MLX5_MAX_PORTS)
		return;

	mutex_lock(&lag_mutex);
	memset(&ldev->pf[i], 0, sizeof(*ldev->pf));

	dev->priv.lag = NULL;
	mutex_unlock(&lag_mutex);
}


/* Must be called with intf_mutex held */
void mlx5_lag_add(struct mlx5_core_dev *dev, struct net_device *netdev)
{
	struct mlx5_lag *ldev = NULL;
	struct mlx5_core_dev *tmp_dev;

	if (!MLX5_CAP_GEN(dev, vport_group_manager) ||
	    !MLX5_CAP_GEN(dev, lag_master) ||
	    (MLX5_CAP_GEN(dev, num_lag_ports) != MLX5_MAX_PORTS))
		return;

	tmp_dev = mlx5_get_next_phys_dev(dev);
	if (tmp_dev)
		ldev = tmp_dev->priv.lag;

	if (!ldev) {
		ldev = mlx5_lag_dev_alloc();
		if (!ldev) {
			mlx5_core_err(dev, "Failed to alloc lag dev\n");
			return;
		}
	}

	mlx5_lag_dev_add_pf(ldev, dev, netdev);

	if (!ldev->nb.notifier_call) {
		ldev->nb.notifier_call = mlx5_lag_netdev_event;
		if (register_netdevice_notifier(&ldev->nb)) {
			ldev->nb.notifier_call = NULL;
			mlx5_core_err(dev, "Failed to register LAG netdev notifier\n");
		}
	}
}

/* Must be called with intf_mutex held */
void mlx5_lag_remove(struct mlx5_core_dev *dev)
{
	struct mlx5_lag *ldev;
	int i;

	ldev = mlx5_lag_dev_get(dev);
	if (!ldev)
		return;

	if (mlx5_lag_is_bonded(ldev))
		mlx5_deactivate_lag(ldev);

	mlx5_lag_dev_remove_pf(ldev, dev);

	for (i = 0; i < MLX5_MAX_PORTS; i++)
		if (ldev->pf[i].dev)
			break;

	if (i == MLX5_MAX_PORTS) {
		if (ldev->nb.notifier_call)
			unregister_netdevice_notifier(&ldev->nb);
		cancel_delayed_work_sync(&ldev->bond_work);
		mlx5_lag_dev_free(ldev);
	}
}

bool mlx5_lag_is_active(struct mlx5_core_dev *dev)
{
	struct mlx5_lag *ldev;
	bool res;

	mutex_lock(&lag_mutex);
	ldev = mlx5_lag_dev_get(dev);
	res  = ldev && mlx5_lag_is_bonded(ldev);
	mutex_unlock(&lag_mutex);

	return res;
}
EXPORT_SYMBOL(mlx5_lag_is_active);

struct net_device *mlx5_lag_get_roce_netdev(struct mlx5_core_dev *dev)
{
	struct net_device *ndev = NULL;
	struct mlx5_lag *ldev;

	mutex_lock(&lag_mutex);
	ldev = mlx5_lag_dev_get(dev);

	if (!(ldev && mlx5_lag_is_bonded(ldev)))
		goto unlock;

	if (ldev->tracker.tx_type == NETDEV_LAG_TX_TYPE_ACTIVEBACKUP) {
		ndev = ldev->tracker.netdev_state[0].tx_enabled ?
		       ldev->pf[0].netdev : ldev->pf[1].netdev;
	} else {
		ndev = ldev->pf[0].netdev;
	}
	if (ndev)
		dev_hold(ndev);

unlock:
	mutex_unlock(&lag_mutex);

	return ndev;
}
EXPORT_SYMBOL(mlx5_lag_get_roce_netdev);

bool mlx5_lag_intf_add(struct mlx5_interface *intf, struct mlx5_priv *priv)
{
	struct mlx5_core_dev *dev = container_of(priv, struct mlx5_core_dev,
						 priv);
	struct mlx5_lag *ldev;

	if (intf->protocol != MLX5_INTERFACE_PROTOCOL_IB)
		return true;

	ldev = mlx5_lag_dev_get(dev);
	if (!ldev || !mlx5_lag_is_bonded(ldev) || ldev->pf[0].dev == dev)
		return true;

	/* If bonded, we do not add an IB device for PF1. */
	return false;
}