[patch net-next 4/5] mlxsw: spectrum_kvdl: Add support for dynamic partition set

[Jiri Pirko]

From: Arkadi Sharshevsky <arka...@mellanox.com>

Add support for dynamic partition set via the resource interface.

Signed-off-by: Arkadi Sharshevsky <arka...@mellanox.com>
Signed-off-by: Jiri Pirko <j...@mellanox.com>
---
 .../net/ethernet/mellanox/mlxsw/spectrum_kvdl.c    | 58 ++++++++++++++++++++--
 1 file changed, 53 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c 
b/drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c
index d4335055ff85..859966e5087b 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c
@@ -67,7 +67,7 @@ struct mlxsw_sp_kvdl_part_info {
 
 struct mlxsw_sp_kvdl_part {
        struct list_head list;
-       const struct mlxsw_sp_kvdl_part_info *info;
+       struct mlxsw_sp_kvdl_part_info *info;
        unsigned long usage[0]; /* Entries */
 };
 
@@ -228,27 +228,74 @@ mlxsw_sp_kvdl_part_find(struct mlxsw_sp *mlxsw_sp, 
unsigned int part_index)
        return NULL;
 }
 
+static void
+mlxsw_sp_kvdl_part_update(struct mlxsw_sp *mlxsw_sp,
+                         struct mlxsw_sp_kvdl_part *part, unsigned int size)
+{
+       struct mlxsw_sp_kvdl_part_info *info = part->info;
+
+       if (list_is_last(&part->list, &mlxsw_sp->kvdl->parts_list)) {
+               info->end_index = size - 1;
+       } else  {
+               struct mlxsw_sp_kvdl_part *last_part;
+
+               last_part = list_next_entry(part, list);
+               info->start_index = last_part->info->end_index + 1;
+               info->end_index = info->start_index + size - 1;
+       }
+}
+
 static int mlxsw_sp_kvdl_part_init(struct mlxsw_sp *mlxsw_sp,
                                   unsigned int part_index)
 {
+       struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
        const struct mlxsw_sp_kvdl_part_info *info;
+       enum mlxsw_sp_resource_id resource_id;
        struct mlxsw_sp_kvdl_part *part;
+       bool need_update = true;
        unsigned int nr_entries;
        size_t usage_size;
+       u64 resource_size;
+       int err;
 
        info = &kvdl_parts_info[part_index];
 
-       nr_entries = (info->end_index - info->start_index + 1) /
-                    info->alloc_size;
+       switch (part_index) {
+       case MLXSW_SP_KVDL_PART_SINGLE:
+               resource_id = MLXSW_SP_RESOURCE_KVD_LINEAR_SINGLE;
+               break;
+       case MLXSW_SP_KVDL_PART_CHUNKS:
+               resource_id = MLXSW_SP_RESOURCE_KVD_LINEAR_CHUNKS;
+               break;
+       case MLXSW_SP_KVDL_PART_LARGE_CHUNKS:
+               resource_id = MLXSW_SP_RESOURCE_KVD_LINEAR_LARGE_CHUNKS;
+               break;
+       }
+
+       err = devlink_resource_size_get(devlink, resource_id, &resource_size);
+       if (err) {
+               need_update = false;
+               resource_size = info->end_index - info->start_index + 1;
+       }
+
+       nr_entries = resource_size / info->alloc_size;
        usage_size = BITS_TO_LONGS(nr_entries) * sizeof(unsigned long);
        part = kzalloc(sizeof(*part) + usage_size, GFP_KERNEL);
        if (!part)
                return -ENOMEM;
 
-       part->info = info;
-       list_add(&part->list, &mlxsw_sp->kvdl->parts_list);
+       part->info = kmemdup(info, sizeof(*part->info), GFP_KERNEL);
+       if (!part->info)
+               goto err_part_info_alloc;
 
+       list_add(&part->list, &mlxsw_sp->kvdl->parts_list);
+       if (need_update)
+               mlxsw_sp_kvdl_part_update(mlxsw_sp, part, resource_size);
        return 0;
+
+err_part_info_alloc:
+       kfree(part);
+       return -ENOMEM;
 }
 
 static void mlxsw_sp_kvdl_part_fini(struct mlxsw_sp *mlxsw_sp,
@@ -261,6 +308,7 @@ static void mlxsw_sp_kvdl_part_fini(struct mlxsw_sp 
*mlxsw_sp,
                return;
 
        list_del(&part->list);
+       kfree(part->info);
        kfree(part);
 }
 
-- 
2.14.3