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}