mlxsw: spectrum_port_range: Add devlink resource support

Expose via devlink-resource the maximum number of port range registers
and their current occupancy. Besides the observability benefits, this
resource will be used by subsequent patches for scale and occupancy
tests.
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Link: https://lore.kernel.org/r/7945e0c715dc5efb1617f45f7560c1f1bd0bcf8a.1689092769.git.petrm@nvidia.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mellanox/mlxsw/spectrum.c

@@ -3739,6 +3739,26 @@ static int mlxsw_sp_resources_rifs_register(struct mlxsw_core *mlxsw_core)
 				      &size_params);
 }
 
+static int
+mlxsw_sp_resources_port_range_register(struct mlxsw_core *mlxsw_core)
+{
+	struct devlink *devlink = priv_to_devlink(mlxsw_core);
+	struct devlink_resource_size_params size_params;
+	u64 max;
+
+	if (!MLXSW_CORE_RES_VALID(mlxsw_core, ACL_MAX_L4_PORT_RANGE))
+		return -EIO;
+
+	max = MLXSW_CORE_RES_GET(mlxsw_core, ACL_MAX_L4_PORT_RANGE);
+	devlink_resource_size_params_init(&size_params, max, max, 1,
+					  DEVLINK_RESOURCE_UNIT_ENTRY);
+
+	return devl_resource_register(devlink, "port_range_registers", max,
+				      MLXSW_SP_RESOURCE_PORT_RANGE_REGISTERS,
+				      DEVLINK_RESOURCE_ID_PARENT_TOP,
+				      &size_params);
+}
+
 static int mlxsw_sp1_resources_register(struct mlxsw_core *mlxsw_core)
 {
 	int err;
@@ -3767,8 +3787,13 @@ static int mlxsw_sp1_resources_register(struct mlxsw_core *mlxsw_core)
 	if (err)
 		goto err_resources_rifs_register;
 
+	err = mlxsw_sp_resources_port_range_register(mlxsw_core);
+	if (err)
+		goto err_resources_port_range_register;
+
 	return 0;
 
+err_resources_port_range_register:
 err_resources_rifs_register:
 err_resources_rif_mac_profile_register:
 err_policer_resources_register:
@@ -3806,8 +3831,13 @@ static int mlxsw_sp2_resources_register(struct mlxsw_core *mlxsw_core)
 	if (err)
 		goto err_resources_rifs_register;
 
+	err = mlxsw_sp_resources_port_range_register(mlxsw_core);
+	if (err)
+		goto err_resources_port_range_register;
+
 	return 0;
 
+err_resources_port_range_register:
 err_resources_rifs_register:
 err_resources_rif_mac_profile_register:
 err_policer_resources_register:

drivers/net/ethernet/mellanox/mlxsw/spectrum.h

@@ -69,6 +69,7 @@ enum mlxsw_sp_resource_id {
 	MLXSW_SP_RESOURCE_SINGLE_RATE_POLICERS,
 	MLXSW_SP_RESOURCE_RIF_MAC_PROFILES,
 	MLXSW_SP_RESOURCE_RIFS,
+	MLXSW_SP_RESOURCE_PORT_RANGE_REGISTERS,
 };
 
 struct mlxsw_sp_port;

drivers/net/ethernet/mellanox/mlxsw/spectrum_port_range.c

@@ -5,6 +5,7 @@
 #include <linux/netlink.h>
 #include <linux/refcount.h>
 #include <linux/xarray.h>
+#include <net/devlink.h>
 
 #include "spectrum.h"
 
@@ -17,6 +18,7 @@ struct mlxsw_sp_port_range_reg {
 struct mlxsw_sp_port_range_core {
 	struct xarray prr_xa;
 	struct xa_limit prr_ids;
+	atomic_t prr_count;
 };
 
 static int
@@ -71,6 +73,8 @@ mlxsw_sp_port_range_reg_create(struct mlxsw_sp *mlxsw_sp,
 		goto err_reg_configure;
 	}
 
+	atomic_inc(&pr_core->prr_count);
+
 	return prr;
 
 err_reg_configure:
@@ -85,6 +89,7 @@ static void mlxsw_sp_port_range_reg_destroy(struct mlxsw_sp *mlxsw_sp,
 {
 	struct mlxsw_sp_port_range_core *pr_core = mlxsw_sp->pr_core;
 
+	atomic_dec(&pr_core->prr_count);
 	xa_erase(&pr_core->prr_xa, prr->index);
 	kfree(prr);
 }
@@ -145,6 +150,13 @@ void mlxsw_sp_port_range_reg_put(struct mlxsw_sp *mlxsw_sp, u8 prr_index)
 	mlxsw_sp_port_range_reg_destroy(mlxsw_sp, prr);
 }
 
+static u64 mlxsw_sp_port_range_reg_occ_get(void *priv)
+{
+	struct mlxsw_sp_port_range_core *pr_core = priv;
+
+	return atomic_read(&pr_core->prr_count);
+}
+
 int mlxsw_sp_port_range_init(struct mlxsw_sp *mlxsw_sp)
 {
 	struct mlxsw_sp_port_range_core *pr_core;
@@ -168,6 +180,11 @@ int mlxsw_sp_port_range_init(struct mlxsw_sp *mlxsw_sp)
 	pr_core->prr_ids.max = max - 1;
 	xa_init_flags(&pr_core->prr_xa, XA_FLAGS_ALLOC);
 
+	devl_resource_occ_get_register(priv_to_devlink(core),
+				       MLXSW_SP_RESOURCE_PORT_RANGE_REGISTERS,
+				       mlxsw_sp_port_range_reg_occ_get,
+				       pr_core);
+
 	return 0;
 }
 
@@ -175,6 +192,8 @@ void mlxsw_sp_port_range_fini(struct mlxsw_sp *mlxsw_sp)
 {
 	struct mlxsw_sp_port_range_core *pr_core = mlxsw_sp->pr_core;
 
+	devl_resource_occ_get_unregister(priv_to_devlink(mlxsw_sp->core),
+					 MLXSW_SP_RESOURCE_PORT_RANGE_REGISTERS);
 	WARN_ON(!xa_empty(&pr_core->prr_xa));
 	xa_destroy(&pr_core->prr_xa);
 	kfree(pr_core);