drivers/net/dsa/sja1105/sja1105_devlink.c

   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 }