kernel/net/bridge/br_mrp_switchdev.c

// SPDX-License-Identifier: GPL-2.0-or-later

#include <net/switchdev.h>

#include "br_private_mrp.h"

static enum br_mrp_hw_support
br_mrp_switchdev_port_obj(struct net_bridge *br,
			  const struct switchdev_obj *obj, bool add)
{
	int err;

	if (add)
		err = switchdev_port_obj_add(br->dev, obj, NULL);
	else
		err = switchdev_port_obj_del(br->dev, obj);

	/* In case of success just return and notify the SW that doesn't need
	 * to do anything
	 */
	if (!err)
		return BR_MRP_HW;

	if (err != -EOPNOTSUPP)
		return BR_MRP_NONE;

	/* Continue with SW backup */
	return BR_MRP_SW;
}

int br_mrp_switchdev_add(struct net_bridge *br, struct br_mrp *mrp)
{
	struct switchdev_obj_mrp mrp_obj = {
		.obj.orig_dev = br->dev,
		.obj.id = SWITCHDEV_OBJ_ID_MRP,
		.p_port = rtnl_dereference(mrp->p_port)->dev,
		.s_port = rtnl_dereference(mrp->s_port)->dev,
		.ring_id = mrp->ring_id,
		.prio = mrp->prio,
	};

	if (!IS_ENABLED(CONFIG_NET_SWITCHDEV))
		return 0;

	return switchdev_port_obj_add(br->dev, &mrp_obj.obj, NULL);
}

int br_mrp_switchdev_del(struct net_bridge *br, struct br_mrp *mrp)
{
	struct switchdev_obj_mrp mrp_obj = {
		.obj.orig_dev = br->dev,
		.obj.id = SWITCHDEV_OBJ_ID_MRP,
		.p_port = NULL,
		.s_port = NULL,
		.ring_id = mrp->ring_id,
	};

	if (!IS_ENABLED(CONFIG_NET_SWITCHDEV))
		return 0;

	return switchdev_port_obj_del(br->dev, &mrp_obj.obj);
}

enum br_mrp_hw_support
br_mrp_switchdev_set_ring_role(struct net_bridge *br, struct br_mrp *mrp,
			       enum br_mrp_ring_role_type role)
{
	struct switchdev_obj_ring_role_mrp mrp_role = {
		.obj.orig_dev = br->dev,
		.obj.id = SWITCHDEV_OBJ_ID_RING_ROLE_MRP,
		.ring_role = role,
		.ring_id = mrp->ring_id,
		.sw_backup = false,
	};
	enum br_mrp_hw_support support;
	int err;

	if (!IS_ENABLED(CONFIG_NET_SWITCHDEV))
		return BR_MRP_SW;

	support = br_mrp_switchdev_port_obj(br, &mrp_role.obj,
					    role != BR_MRP_RING_ROLE_DISABLED);
	if (support != BR_MRP_SW)
		return support;

	/* If the driver can't configure to run completely the protocol in HW,
	 * then try again to configure the HW so the SW can run the protocol.
	 */
	mrp_role.sw_backup = true;
	if (role != BR_MRP_RING_ROLE_DISABLED)
		err = switchdev_port_obj_add(br->dev, &mrp_role.obj, NULL);
	else
		err = switchdev_port_obj_del(br->dev, &mrp_role.obj);

	if (!err)
		return BR_MRP_SW;

	return BR_MRP_NONE;
}

enum br_mrp_hw_support
br_mrp_switchdev_send_ring_test(struct net_bridge *br, struct br_mrp *mrp,
				u32 interval, u8 max_miss, u32 period,
				bool monitor)
{
	struct switchdev_obj_ring_test_mrp test = {
		.obj.orig_dev = br->dev,
		.obj.id = SWITCHDEV_OBJ_ID_RING_TEST_MRP,
		.interval = interval,
		.max_miss = max_miss,
		.ring_id = mrp->ring_id,
		.period = period,
		.monitor = monitor,
	};

	if (!IS_ENABLED(CONFIG_NET_SWITCHDEV))
		return BR_MRP_SW;

	return br_mrp_switchdev_port_obj(br, &test.obj, interval != 0);
}

int br_mrp_switchdev_set_ring_state(struct net_bridge *br,
				    struct br_mrp *mrp,
				    enum br_mrp_ring_state_type state)
{
	struct switchdev_obj_ring_state_mrp mrp_state = {
		.obj.orig_dev = br->dev,
		.obj.id = SWITCHDEV_OBJ_ID_RING_STATE_MRP,
		.ring_state = state,
		.ring_id = mrp->ring_id,
	};

	if (!IS_ENABLED(CONFIG_NET_SWITCHDEV))
		return 0;

	return switchdev_port_obj_add(br->dev, &mrp_state.obj, NULL);
}

enum br_mrp_hw_support
br_mrp_switchdev_set_in_role(struct net_bridge *br, struct br_mrp *mrp,
			     u16 in_id, u32 ring_id,
			     enum br_mrp_in_role_type role)
{
	struct switchdev_obj_in_role_mrp mrp_role = {
		.obj.orig_dev = br->dev,
		.obj.id = SWITCHDEV_OBJ_ID_IN_ROLE_MRP,
		.in_role = role,
		.in_id = mrp->in_id,
		.ring_id = mrp->ring_id,
		.i_port = rtnl_dereference(mrp->i_port)->dev,
		.sw_backup = false,
	};
	enum br_mrp_hw_support support;
	int err;

	if (!IS_ENABLED(CONFIG_NET_SWITCHDEV))
		return BR_MRP_SW;

	support = br_mrp_switchdev_port_obj(br, &mrp_role.obj,
					    role != BR_MRP_IN_ROLE_DISABLED);
	if (support != BR_MRP_NONE)
		return support;

	/* If the driver can't configure to run completely the protocol in HW,
	 * then try again to configure the HW so the SW can run the protocol.
	 */
	mrp_role.sw_backup = true;
	if (role != BR_MRP_IN_ROLE_DISABLED)
		err = switchdev_port_obj_add(br->dev, &mrp_role.obj, NULL);
	else
		err = switchdev_port_obj_del(br->dev, &mrp_role.obj);

	if (!err)
		return BR_MRP_SW;

	return BR_MRP_NONE;
}

int br_mrp_switchdev_set_in_state(struct net_bridge *br, struct br_mrp *mrp,
				  enum br_mrp_in_state_type state)
{
	struct switchdev_obj_in_state_mrp mrp_state = {
		.obj.orig_dev = br->dev,
		.obj.id = SWITCHDEV_OBJ_ID_IN_STATE_MRP,
		.in_state = state,
		.in_id = mrp->in_id,
	};

	if (!IS_ENABLED(CONFIG_NET_SWITCHDEV))
		return 0;

	return switchdev_port_obj_add(br->dev, &mrp_state.obj, NULL);
}

enum br_mrp_hw_support
br_mrp_switchdev_send_in_test(struct net_bridge *br, struct br_mrp *mrp,
			      u32 interval, u8 max_miss, u32 period)
{
	struct switchdev_obj_in_test_mrp test = {
		.obj.orig_dev = br->dev,
		.obj.id = SWITCHDEV_OBJ_ID_IN_TEST_MRP,
		.interval = interval,
		.max_miss = max_miss,
		.in_id = mrp->in_id,
		.period = period,
	};

	if (!IS_ENABLED(CONFIG_NET_SWITCHDEV))
		return BR_MRP_SW;

	return br_mrp_switchdev_port_obj(br, &test.obj, interval != 0);
}

int br_mrp_port_switchdev_set_state(struct net_bridge_port *p, u32 state)
{
	struct switchdev_attr attr = {
		.orig_dev = p->dev,
		.id = SWITCHDEV_ATTR_ID_PORT_STP_STATE,
		.u.stp_state = state,
	};

	if (!IS_ENABLED(CONFIG_NET_SWITCHDEV))
		return 0;

	return switchdev_port_attr_set(p->dev, &attr, NULL);
}

int br_mrp_port_switchdev_set_role(struct net_bridge_port *p,
				   enum br_mrp_port_role_type role)
{
	struct switchdev_attr attr = {
		.orig_dev = p->dev,
		.id = SWITCHDEV_ATTR_ID_MRP_PORT_ROLE,
		.u.mrp_port_role = role,
	};

	if (!IS_ENABLED(CONFIG_NET_SWITCHDEV))
		return 0;

	return switchdev_port_attr_set(p->dev, &attr, NULL);
}