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  */
14 static 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 
35 static int
36 sja1105_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 
55 static 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 
61 enum sja1105_region_id {
62 	SJA1105_REGION_STATIC_CONFIG = 0,
63 };
64 
65 struct sja1105_region {
66 	const struct devlink_region_ops *ops;
67 	size_t (*get_size)(struct sja1105_private *priv);
68 };
69 
70 static 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 
77 static 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 
109 static 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 
120 int 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 
131 int sja1105_devlink_setup(struct dsa_switch *ds)
132 {
133 	return sja1105_setup_devlink_regions(ds);
134 }
135 
136 void sja1105_devlink_teardown(struct dsa_switch *ds)
137 {
138 	sja1105_teardown_devlink_regions(ds);
139 }
140