From: Arkadi Sharshevsky <arkadis@mellanox.com>
Date: Mon, 15 Jan 2018 08:59:09 +0100
Subject: mlxsw: spectrum: Add support for getting kvdl occupancy
Patch-mainline: v4.16-rc1
Git-commit: afadc26b3aa3e94d1cedf9472889b4c32aecc6ac
References: bsc#1112374

Add support for getting the kvdl occupancy through the resource interface.

Signed-off-by: Arkadi Sharshevsky <arkadis@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum.c      |    9 ++++++
 drivers/net/ethernet/mellanox/mlxsw/spectrum.h      |    1 
 drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c |   26 ++++++++++++++++++++
 3 files changed, 36 insertions(+)

--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
@@ -4055,12 +4055,21 @@ mlxsw_sp_resource_kvd_hash_double_size_v
 	return 0;
 }
 
+static u64 mlxsw_sp_resource_kvd_linear_occ_get(struct devlink *devlink)
+{
+	struct mlxsw_core *mlxsw_core = devlink_priv(devlink);
+	struct mlxsw_sp *mlxsw_sp = mlxsw_core_driver_priv(mlxsw_core);
+
+	return mlxsw_sp_kvdl_occ_get(mlxsw_sp);
+}
+
 static struct devlink_resource_ops mlxsw_sp_resource_kvd_ops = {
 	.size_validate = mlxsw_sp_resource_kvd_size_validate,
 };
 
 static struct devlink_resource_ops mlxsw_sp_resource_kvd_linear_ops = {
 	.size_validate = mlxsw_sp_resource_kvd_linear_size_validate,
+	.occ_get = mlxsw_sp_resource_kvd_linear_occ_get,
 };
 
 static struct devlink_resource_ops mlxsw_sp_resource_kvd_hash_single_ops = {
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
@@ -448,6 +448,7 @@ void mlxsw_sp_kvdl_free(struct mlxsw_sp
 int mlxsw_sp_kvdl_alloc_size_query(struct mlxsw_sp *mlxsw_sp,
 				   unsigned int entry_count,
 				   unsigned int *p_alloc_size);
+u64 mlxsw_sp_kvdl_occ_get(const struct mlxsw_sp *mlxsw_sp);
 
 struct mlxsw_sp_acl_rule_info {
 	unsigned int priority;
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c
@@ -286,6 +286,32 @@ static void mlxsw_sp_kvdl_parts_fini(str
 		mlxsw_sp_kvdl_part_fini(mlxsw_sp, i);
 }
 
+u64 mlxsw_sp_kvdl_part_occ(struct mlxsw_sp_kvdl_part *part)
+{
+	unsigned int nr_entries;
+	int bit = -1;
+	u64 occ = 0;
+
+	nr_entries = (part->info->end_index -
+		      part->info->start_index + 1) /
+		      part->info->alloc_size;
+	while ((bit = find_next_bit(part->usage, nr_entries, bit + 1))
+		< nr_entries)
+		occ += part->info->alloc_size;
+	return occ;
+}
+
+u64 mlxsw_sp_kvdl_occ_get(const struct mlxsw_sp *mlxsw_sp)
+{
+	struct mlxsw_sp_kvdl_part *part;
+	u64 occ = 0;
+
+	list_for_each_entry(part, &mlxsw_sp->kvdl->parts_list, list)
+		occ += mlxsw_sp_kvdl_part_occ(part);
+
+	return occ;
+}
+
 int mlxsw_sp_kvdl_init(struct mlxsw_sp *mlxsw_sp)
 {
 	struct mlxsw_sp_kvdl *kvdl;