netdev - [patch net-next v3 08/11] mlxsw: spectrum: Add support for getting kvdl occupancy

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Date:   Mon, 15 Jan 2018 08:59:09 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, arkadis@...lanox.com, mlxsw@...lanox.com,
        andrew@...n.ch, vivien.didelot@...oirfairelinux.com,
        f.fainelli@...il.com, michael.chan@...adcom.com,
        ganeshgr@...lsio.com, saeedm@...lanox.com, matanb@...lanox.com,
        leonro@...lanox.com, idosch@...lanox.com,
        jakub.kicinski@...ronome.com, ast@...nel.org, daniel@...earbox.net,
        simon.horman@...ronome.com, pieter.jansenvanvuuren@...ronome.com,
        john.hurley@...ronome.com, alexander.h.duyck@...el.com,
        linville@...driver.com, gospo@...adcom.com,
        steven.lin1@...adcom.com, yuvalm@...lanox.com,
        ogerlitz@...lanox.com, dsa@...ulusnetworks.com,
        roopa@...ulusnetworks.com
Subject: [patch net-next v3 08/11] mlxsw: spectrum: Add support for getting kvdl occupancy

From: Arkadi Sharshevsky <arkadis@...lanox.com>

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

Signed-off-by: Arkadi Sharshevsky <arkadis@...lanox.com>
Signed-off-by: Jiri Pirko <jiri@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum.c     |  9 ++++++++
 drivers/net/ethernet/mellanox/mlxsw/spectrum.h     |  1 +
 .../net/ethernet/mellanox/mlxsw/spectrum_kvdl.c    | 26 ++++++++++++++++++++++
 3 files changed, 36 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
index 53b16ddc6acc..87f8a74118d9 100644
--- 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_validate(struct devlink *devlink, u64 siz
 	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 = {
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
index 435e0f2225f6..237cad373dbe 100644
--- 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 *mlxsw_sp, int entry_index);
 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;
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_kvdl.c
index 310c38247b5c..cfacc176a1bd 100644
--- 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(struct mlxsw_sp *mlxsw_sp)
 		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;
-- 
2.14.3