1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2018-2019, Vladimir Oltean <olteanv@gmail.com>
3 * Copyright 2020 NXP
4 */
5#include "sja1105.h"
6
7/* Since devlink regions have a fixed size and the static config has a variable
8 * size, we need to calculate the maximum possible static config size by
9 * creating a dummy config with all table entries populated to the max, and get
10 * its packed length. This is done dynamically as opposed to simply hardcoding
11 * a number, since currently not all static config tables are implemented, so
12 * we are avoiding a possible code desynchronization.
13 */
14static size_t sja1105_static_config_get_max_size(struct sja1105_private *priv)
15{
16	struct sja1105_static_config config;
17	enum sja1105_blk_idx blk_idx;
18	int rc;
19
20	rc = sja1105_static_config_init(&config,
21					priv->info->static_ops,
22					priv->info->device_id);
23	if (rc)
24		return 0;
25
26	for (blk_idx = 0; blk_idx < BLK_IDX_MAX; blk_idx++) {
27		struct sja1105_table *table = &config.tables[blk_idx];
28
29		table->entry_count = table->ops->max_entry_count;
30	}
31
32	return sja1105_static_config_get_length(&config);
33}
34
35static int
36sja1105_region_static_config_snapshot(struct devlink *dl,
37				      const struct devlink_region_ops *ops,
38				      struct netlink_ext_ack *extack,
39				      u8 **data)
40{
41	struct dsa_switch *ds = dsa_devlink_to_ds(dl);
42	struct sja1105_private *priv = ds->priv;
43	size_t max_len, len;
44
45	len = sja1105_static_config_get_length(&priv->static_config);
46	max_len = sja1105_static_config_get_max_size(priv);
47
48	*data = kcalloc(max_len, sizeof(u8), GFP_KERNEL);
49	if (!*data)
50		return -ENOMEM;
51
52	return static_config_buf_prepare_for_upload(priv, *data, len);
53}
54
55static struct devlink_region_ops sja1105_region_static_config_ops = {
56	.name = "static-config",
57	.snapshot = sja1105_region_static_config_snapshot,
58	.destructor = kfree,
59};
60
61enum sja1105_region_id {
62	SJA1105_REGION_STATIC_CONFIG = 0,
63};
64
65struct sja1105_region {
66	const struct devlink_region_ops *ops;
67	size_t (*get_size)(struct sja1105_private *priv);
68};
69
70static struct sja1105_region sja1105_regions[] = {
71	[SJA1105_REGION_STATIC_CONFIG] = {
72		.ops = &sja1105_region_static_config_ops,
73		.get_size = sja1105_static_config_get_max_size,
74	},
75};
76
77static int sja1105_setup_devlink_regions(struct dsa_switch *ds)
78{
79	int i, num_regions = ARRAY_SIZE(sja1105_regions);
80	struct sja1105_private *priv = ds->priv;
81	const struct devlink_region_ops *ops;
82	struct devlink_region *region;
83	u64 size;
84
85	priv->regions = kcalloc(num_regions, sizeof(struct devlink_region *),
86				GFP_KERNEL);
87	if (!priv->regions)
88		return -ENOMEM;
89
90	for (i = 0; i < num_regions; i++) {
91		size = sja1105_regions[i].get_size(priv);
92		ops = sja1105_regions[i].ops;
93
94		region = dsa_devlink_region_create(ds, ops, 1, size);
95		if (IS_ERR(region)) {
96			while (--i >= 0)
97				dsa_devlink_region_destroy(priv->regions[i]);
98
99			kfree(priv->regions);
100			return PTR_ERR(region);
101		}
102
103		priv->regions[i] = region;
104	}
105
106	return 0;
107}
108
109static void sja1105_teardown_devlink_regions(struct dsa_switch *ds)
110{
111	int i, num_regions = ARRAY_SIZE(sja1105_regions);
112	struct sja1105_private *priv = ds->priv;
113
114	for (i = 0; i < num_regions; i++)
115		dsa_devlink_region_destroy(priv->regions[i]);
116
117	kfree(priv->regions);
118}
119
120int sja1105_devlink_info_get(struct dsa_switch *ds,
121			     struct devlink_info_req *req,
122			     struct netlink_ext_ack *extack)
123{
124	struct sja1105_private *priv = ds->priv;
125
126	return devlink_info_version_fixed_put(req,
127					      DEVLINK_INFO_VERSION_GENERIC_ASIC_ID,
128					      priv->info->name);
129}
130
131int sja1105_devlink_setup(struct dsa_switch *ds)
132{
133	return sja1105_setup_devlink_regions(ds);
134}
135
136void sja1105_devlink_teardown(struct dsa_switch *ds)
137{
138	sja1105_teardown_devlink_regions(ds);
139}
140