mlxsw: spectrum: add "acl_region_rehash_interval" devlink param

Expose new driver-specific "acl_region_rehash_interval" devlink param
which would allow user to alter default ACL region rehash interval.
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/networking/devlink-params-mlxsw.txt

 fw_load_policy		[DEVICE, GENERIC]
 			Configuration mode: driverinit
+
+acl_region_rehash_interval	[DEVICE, DRIVER-SPECIFIC]
+			Sets an interval for periodic ACL region rehashes.
+			The value is in milliseconds, minimal value is "3000".
+			Value "0" disables the periodic work.
+			The first rehash will be run right after value is set.
+			Type: u32
+			Configuration mode: runtime

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

@@ -394,4 +394,9 @@ static inline void mlxsw_thermal_fini(struct mlxsw_thermal *thermal)
 
 #endif
 
+enum mlxsw_devlink_param_id {
+	MLXSW_DEVLINK_PARAM_ID_BASE = DEVLINK_PARAM_GENERIC_ID_MAX,
+	MLXSW_DEVLINK_PARAM_ID_ACL_REGION_REHASH_INTERVAL,
+};
+
 #endif

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

@@ -4413,6 +4413,71 @@ static void mlxsw_sp_params_unregister(struct mlxsw_core *mlxsw_core)
 				  ARRAY_SIZE(mlxsw_sp_devlink_params));
 }
 
+static int
+mlxsw_sp_params_acl_region_rehash_intrvl_get(struct devlink *devlink, u32 id,
+					     struct devlink_param_gset_ctx *ctx)
+{
+	struct mlxsw_core *mlxsw_core = devlink_priv(devlink);
+	struct mlxsw_sp *mlxsw_sp = mlxsw_core_driver_priv(mlxsw_core);
+
+	ctx->val.vu32 = mlxsw_sp_acl_region_rehash_intrvl_get(mlxsw_sp);
+	return 0;
+}
+
+static int
+mlxsw_sp_params_acl_region_rehash_intrvl_set(struct devlink *devlink, u32 id,
+					     struct devlink_param_gset_ctx *ctx)
+{
+	struct mlxsw_core *mlxsw_core = devlink_priv(devlink);
+	struct mlxsw_sp *mlxsw_sp = mlxsw_core_driver_priv(mlxsw_core);
+
+	return mlxsw_sp_acl_region_rehash_intrvl_set(mlxsw_sp, ctx->val.vu32);
+}
+
+static const struct devlink_param mlxsw_sp2_devlink_params[] = {
+	DEVLINK_PARAM_DRIVER(MLXSW_DEVLINK_PARAM_ID_ACL_REGION_REHASH_INTERVAL,
+			     "acl_region_rehash_interval",
+			     DEVLINK_PARAM_TYPE_U32,
+			     BIT(DEVLINK_PARAM_CMODE_RUNTIME),
+			     mlxsw_sp_params_acl_region_rehash_intrvl_get,
+			     mlxsw_sp_params_acl_region_rehash_intrvl_set,
+			     NULL),
+};
+
+static int mlxsw_sp2_params_register(struct mlxsw_core *mlxsw_core)
+{
+	struct devlink *devlink = priv_to_devlink(mlxsw_core);
+	union devlink_param_value value;
+	int err;
+
+	err = mlxsw_sp_params_register(mlxsw_core);
+	if (err)
+		return err;
+
+	err = devlink_params_register(devlink, mlxsw_sp2_devlink_params,
+				      ARRAY_SIZE(mlxsw_sp2_devlink_params));
+	if (err)
+		goto err_devlink_params_register;
+
+	value.vu32 = 0;
+	devlink_param_driverinit_value_set(devlink,
+					   MLXSW_DEVLINK_PARAM_ID_ACL_REGION_REHASH_INTERVAL,
+					   value);
+	return 0;
+
+err_devlink_params_register:
+	mlxsw_sp_params_unregister(mlxsw_core);
+	return err;
+}
+
+static void mlxsw_sp2_params_unregister(struct mlxsw_core *mlxsw_core)
+{
+	devlink_params_unregister(priv_to_devlink(mlxsw_core),
+				  mlxsw_sp2_devlink_params,
+				  ARRAY_SIZE(mlxsw_sp2_devlink_params));
+	mlxsw_sp_params_unregister(mlxsw_core);
+}
+
 static struct mlxsw_driver mlxsw_sp1_driver = {
 	.kind				= mlxsw_sp1_driver_name,
 	.priv_size			= sizeof(struct mlxsw_sp),
@@ -4461,8 +4526,8 @@ static struct mlxsw_driver mlxsw_sp2_driver = {
 	.sb_occ_tc_port_bind_get	= mlxsw_sp_sb_occ_tc_port_bind_get,
 	.txhdr_construct		= mlxsw_sp_txhdr_construct,
 	.resources_register		= mlxsw_sp2_resources_register,
-	.params_register		= mlxsw_sp_params_register,
-	.params_unregister		= mlxsw_sp_params_unregister,
+	.params_register		= mlxsw_sp2_params_register,
+	.params_unregister		= mlxsw_sp2_params_unregister,
 	.txhdr_len			= MLXSW_TXHDR_LEN,
 	.profile			= &mlxsw_sp2_config_profile,
 	.res_query_enabled		= true,

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

@@ -690,6 +690,8 @@ struct mlxsw_sp_fid *mlxsw_sp_acl_dummy_fid(struct mlxsw_sp *mlxsw_sp);
 
 int mlxsw_sp_acl_init(struct mlxsw_sp *mlxsw_sp);
 void mlxsw_sp_acl_fini(struct mlxsw_sp *mlxsw_sp);
+u32 mlxsw_sp_acl_region_rehash_intrvl_get(struct mlxsw_sp *mlxsw_sp);
+int mlxsw_sp_acl_region_rehash_intrvl_set(struct mlxsw_sp *mlxsw_sp, u32 val);
 
 /* spectrum_acl_tcam.c */
 struct mlxsw_sp_acl_tcam;

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

@@ -912,3 +912,19 @@ void mlxsw_sp_acl_fini(struct mlxsw_sp *mlxsw_sp)
 	mlxsw_afk_destroy(acl->afk);
 	kfree(acl);
 }
+
+u32 mlxsw_sp_acl_region_rehash_intrvl_get(struct mlxsw_sp *mlxsw_sp)
+{
+	struct mlxsw_sp_acl *acl = mlxsw_sp->acl;
+
+	return mlxsw_sp_acl_tcam_vregion_rehash_intrvl_get(mlxsw_sp,
+							   &acl->tcam);
+}
+
+int mlxsw_sp_acl_region_rehash_intrvl_set(struct mlxsw_sp *mlxsw_sp, u32 val)
+{
+	struct mlxsw_sp_acl *acl = mlxsw_sp->acl;
+
+	return mlxsw_sp_acl_tcam_vregion_rehash_intrvl_set(mlxsw_sp,
+							   &acl->tcam, val);
+}

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

@@ -24,6 +24,7 @@ size_t mlxsw_sp_acl_tcam_priv_size(struct mlxsw_sp *mlxsw_sp)
 }
 
 #define MLXSW_SP_ACL_TCAM_VREGION_REHASH_INTRVL_DFLT 5000 /* ms */
+#define MLXSW_SP_ACL_TCAM_VREGION_REHASH_INTRVL_MIN 3000 /* ms */
 
 int mlxsw_sp_acl_tcam_init(struct mlxsw_sp *mlxsw_sp,
 			   struct mlxsw_sp_acl_tcam *tcam)
@@ -725,6 +726,41 @@ mlxsw_sp_acl_tcam_vregion_destroy(struct mlxsw_sp *mlxsw_sp,
 	kfree(vregion);
 }
 
+u32 mlxsw_sp_acl_tcam_vregion_rehash_intrvl_get(struct mlxsw_sp *mlxsw_sp,
+						struct mlxsw_sp_acl_tcam *tcam)
+{
+	const struct mlxsw_sp_acl_tcam_ops *ops = mlxsw_sp->acl_tcam_ops;
+	u32 vregion_rehash_intrvl;
+
+	if (WARN_ON(!ops->region_rehash_hints_get))
+		return 0;
+	vregion_rehash_intrvl = tcam->vregion_rehash_intrvl;
+	return vregion_rehash_intrvl;
+}
+
+int mlxsw_sp_acl_tcam_vregion_rehash_intrvl_set(struct mlxsw_sp *mlxsw_sp,
+						struct mlxsw_sp_acl_tcam *tcam,
+						u32 val)
+{
+	const struct mlxsw_sp_acl_tcam_ops *ops = mlxsw_sp->acl_tcam_ops;
+	struct mlxsw_sp_acl_tcam_vregion *vregion;
+
+	if (val < MLXSW_SP_ACL_TCAM_VREGION_REHASH_INTRVL_MIN && val)
+		return -EINVAL;
+	if (WARN_ON(!ops->region_rehash_hints_get))
+		return -EOPNOTSUPP;
+	tcam->vregion_rehash_intrvl = val;
+	rtnl_lock();
+	list_for_each_entry(vregion, &tcam->vregion_list, tlist) {
+		if (val)
+			mlxsw_core_schedule_dw(&vregion->rehash_dw, 0);
+		else
+			cancel_delayed_work_sync(&vregion->rehash_dw);
+	}
+	rtnl_unlock();
+	return 0;
+}
+
 static int
 mlxsw_sp_acl_tcam_vchunk_assoc(struct mlxsw_sp *mlxsw_sp,
 			       struct mlxsw_sp_acl_tcam_group *group,

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

@@ -28,6 +28,11 @@ int mlxsw_sp_acl_tcam_init(struct mlxsw_sp *mlxsw_sp,
 			   struct mlxsw_sp_acl_tcam *tcam);
 void mlxsw_sp_acl_tcam_fini(struct mlxsw_sp *mlxsw_sp,
 			    struct mlxsw_sp_acl_tcam *tcam);
+u32 mlxsw_sp_acl_tcam_vregion_rehash_intrvl_get(struct mlxsw_sp *mlxsw_sp,
+						struct mlxsw_sp_acl_tcam *tcam);
+int mlxsw_sp_acl_tcam_vregion_rehash_intrvl_set(struct mlxsw_sp *mlxsw_sp,
+						struct mlxsw_sp_acl_tcam *tcam,
+						u32 val);
 int mlxsw_sp_acl_tcam_priority_get(struct mlxsw_sp *mlxsw_sp,
 				   struct mlxsw_sp_acl_rule_info *rulei,
 				   u32 *priority, bool fillup_priority);