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 */
sja1105_static_config_get_max_size(struct sja1105_private * priv)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
sja1105_region_static_config_snapshot(struct devlink * dl,const struct devlink_region_ops * ops,struct netlink_ext_ack * extack,u8 ** data)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
sja1105_setup_devlink_regions(struct dsa_switch * ds)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
sja1105_teardown_devlink_regions(struct dsa_switch * ds)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
sja1105_devlink_info_get(struct dsa_switch * ds,struct devlink_info_req * req,struct netlink_ext_ack * extack)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
sja1105_devlink_setup(struct dsa_switch * ds)131 int sja1105_devlink_setup(struct dsa_switch *ds)
132 {
133 return sja1105_setup_devlink_regions(ds);
134 }
135
sja1105_devlink_teardown(struct dsa_switch * ds)136 void sja1105_devlink_teardown(struct dsa_switch *ds)
137 {
138 sja1105_teardown_devlink_regions(ds);
139 }
140