net: mscc: ocelot: Add support for MRP

Add basic support for MRP. The HW will just trap all MRP frames on the
ring ports to CPU and allow the SW to process them. In this way it is
possible to for this node to behave both as MRM and MRC.

Current limitations are:
- it doesn't support Interconnect roles.
- it supports only a single ring.
- the HW should be able to do forwarding of MRP Test frames so the SW
  will not need to do this. So it would be able to have the role MRC
  without SW support.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 245 insertions, 1 deletions

diff --git a/drivers/net/ethernet/mscc/Makefile b/drivers/net/ethernet/mscc/Makefile
index 346bba2730ad..722c27694b21 100644
--- a/drivers/net/ethernet/mscc/Makefile
+++ b/drivers/net/ethernet/mscc/Makefile
@@ -8,6 +8,7 @@ mscc_ocelot_switch_lib-y := \
 	ocelot_flower.o \
 	ocelot_ptp.o \
 	ocelot_devlink.o
+mscc_ocelot_switch_lib-$(CONFIG_BRIDGE_MRP) += ocelot_mrp.o
 obj-$(CONFIG_MSCC_OCELOT_SWITCH) += mscc_ocelot.o
 mscc_ocelot-y := \
 	ocelot_vsc7514.o \
diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
index 5d13087c85d6..46e5c9136bac 100644
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -687,7 +687,7 @@ static int ocelot_xtr_poll_xfh(struct ocelot *ocelot, int grp, u32 *xfh)
 int ocelot_xtr_poll_frame(struct ocelot *ocelot, int grp, struct sk_buff **nskb)
 {
 	struct skb_shared_hwtstamps *shhwtstamps;
-	u64 tod_in_ns, full_ts_in_ns;
+	u64 tod_in_ns, full_ts_in_ns, cpuq;
 	u64 timestamp, src_port, len;
 	u32 xfh[OCELOT_TAG_LEN / 4];
 	struct net_device *dev;
@@ -704,6 +704,7 @@ int ocelot_xtr_poll_frame(struct ocelot *ocelot, int grp, struct sk_buff **nskb)
 	ocelot_xfh_get_src_port(xfh, &src_port);
 	ocelot_xfh_get_len(xfh, &len);
 	ocelot_xfh_get_rew_val(xfh, &timestamp);
+	ocelot_xfh_get_cpuq(xfh, &cpuq);
 
 	if (WARN_ON(src_port >= ocelot->num_phys_ports))
 		return -EINVAL;
@@ -770,6 +771,13 @@ int ocelot_xtr_poll_frame(struct ocelot *ocelot, int grp, struct sk_buff **nskb)
 		skb->offload_fwd_mark = 1;
 
 	skb->protocol = eth_type_trans(skb, dev);
+
+#if IS_ENABLED(CONFIG_BRIDGE_MRP)
+	if (skb->protocol == cpu_to_be16(ETH_P_MRP) &&
+	    cpuq & BIT(OCELOT_MRP_CPUQ))
+		skb->offload_fwd_mark = 0;
+#endif
+
 	*nskb = skb;
 
 	return 0;
diff --git a/drivers/net/ethernet/mscc/ocelot_mrp.c b/drivers/net/ethernet/mscc/ocelot_mrp.c
new file mode 100644
index 000000000000..683da320bfd8
--- /dev/null
+++ b/drivers/net/ethernet/mscc/ocelot_mrp.c
@@ -0,0 +1,175 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+/* Microsemi Ocelot Switch driver
+ *
+ * This contains glue logic between the switchdev driver operations and the
+ * mscc_ocelot_switch_lib.
+ *
+ * Copyright (c) 2017, 2019 Microsemi Corporation
+ * Copyright 2020-2021 NXP Semiconductors
+ */
+
+#include <linux/if_bridge.h>
+#include <linux/mrp_bridge.h>
+#include <soc/mscc/ocelot_vcap.h>
+#include <uapi/linux/mrp_bridge.h>
+#include "ocelot.h"
+#include "ocelot_vcap.h"
+
+static int ocelot_mrp_del_vcap(struct ocelot *ocelot, int port)
+{
+	struct ocelot_vcap_block *block_vcap_is2;
+	struct ocelot_vcap_filter *filter;
+
+	block_vcap_is2 = &ocelot->block[VCAP_IS2];
+	filter = ocelot_vcap_block_find_filter_by_id(block_vcap_is2, port,
+						     false);
+	if (!filter)
+		return 0;
+
+	return ocelot_vcap_filter_del(ocelot, filter);
+}
+
+int ocelot_mrp_add(struct ocelot *ocelot, int port,
+		   const struct switchdev_obj_mrp *mrp)
+{
+	struct ocelot_port *ocelot_port = ocelot->ports[port];
+	struct ocelot_port_private *priv;
+	struct net_device *dev;
+
+	if (!ocelot_port)
+		return -EOPNOTSUPP;
+
+	priv = container_of(ocelot_port, struct ocelot_port_private, port);
+	dev = priv->dev;
+
+	if (mrp->p_port != dev && mrp->s_port != dev)
+		return 0;
+
+	if (ocelot->mrp_ring_id != 0 &&
+	    ocelot->mrp_s_port &&
+	    ocelot->mrp_p_port)
+		return -EINVAL;
+
+	if (mrp->p_port == dev)
+		ocelot->mrp_p_port = dev;
+
+	if (mrp->s_port == dev)
+		ocelot->mrp_s_port = dev;
+
+	ocelot->mrp_ring_id = mrp->ring_id;
+
+	return 0;
+}
+EXPORT_SYMBOL(ocelot_mrp_add);
+
+int ocelot_mrp_del(struct ocelot *ocelot, int port,
+		   const struct switchdev_obj_mrp *mrp)
+{
+	struct ocelot_port *ocelot_port = ocelot->ports[port];
+	struct ocelot_port_private *priv;
+	struct net_device *dev;
+
+	if (!ocelot_port)
+		return -EOPNOTSUPP;
+
+	priv = container_of(ocelot_port, struct ocelot_port_private, port);
+	dev = priv->dev;
+
+	if (ocelot->mrp_p_port != dev && ocelot->mrp_s_port != dev)
+		return 0;
+
+	if (ocelot->mrp_ring_id == 0 &&
+	    !ocelot->mrp_s_port &&
+	    !ocelot->mrp_p_port)
+		return -EINVAL;
+
+	if (ocelot_mrp_del_vcap(ocelot, priv->chip_port))
+		return -EINVAL;
+
+	if (ocelot->mrp_p_port == dev)
+		ocelot->mrp_p_port = NULL;
+
+	if (ocelot->mrp_s_port == dev)
+		ocelot->mrp_s_port = NULL;
+
+	ocelot->mrp_ring_id = 0;
+
+	return 0;
+}
+EXPORT_SYMBOL(ocelot_mrp_del);
+
+int ocelot_mrp_add_ring_role(struct ocelot *ocelot, int port,
+			     const struct switchdev_obj_ring_role_mrp *mrp)
+{
+	struct ocelot_port *ocelot_port = ocelot->ports[port];
+	struct ocelot_vcap_filter *filter;
+	struct ocelot_port_private *priv;
+	struct net_device *dev;
+	int err;
+
+	if (!ocelot_port)
+		return -EOPNOTSUPP;
+
+	priv = container_of(ocelot_port, struct ocelot_port_private, port);
+	dev = priv->dev;
+
+	if (ocelot->mrp_ring_id != mrp->ring_id)
+		return -EINVAL;
+
+	if (!mrp->sw_backup)
+		return -EOPNOTSUPP;
+
+	if (ocelot->mrp_p_port != dev && ocelot->mrp_s_port != dev)
+		return 0;
+
+	filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
+	if (!filter)
+		return -ENOMEM;
+
+	filter->key_type = OCELOT_VCAP_KEY_ETYPE;
+	filter->prio = 1;
+	filter->id.cookie = priv->chip_port;
+	filter->id.tc_offload = false;
+	filter->block_id = VCAP_IS2;
+	filter->type = OCELOT_VCAP_FILTER_OFFLOAD;
+	filter->ingress_port_mask = BIT(priv->chip_port);
+	*(__be16 *)filter->key.etype.etype.value = htons(ETH_P_MRP);
+	*(__be16 *)filter->key.etype.etype.mask = htons(0xffff);
+	filter->action.mask_mode = OCELOT_MASK_MODE_PERMIT_DENY;
+	filter->action.port_mask = 0x0;
+	filter->action.cpu_copy_ena = true;
+	filter->action.cpu_qu_num = OCELOT_MRP_CPUQ;
+
+	err = ocelot_vcap_filter_add(ocelot, filter, NULL);
+	if (err)
+		kfree(filter);
+
+	return err;
+}
+EXPORT_SYMBOL(ocelot_mrp_add_ring_role);
+
+int ocelot_mrp_del_ring_role(struct ocelot *ocelot, int port,
+			     const struct switchdev_obj_ring_role_mrp *mrp)
+{
+	struct ocelot_port *ocelot_port = ocelot->ports[port];
+	struct ocelot_port_private *priv;
+	struct net_device *dev;
+
+	if (!ocelot_port)
+		return -EOPNOTSUPP;
+
+	priv = container_of(ocelot_port, struct ocelot_port_private, port);
+	dev = priv->dev;
+
+	if (ocelot->mrp_ring_id != mrp->ring_id)
+		return -EINVAL;
+
+	if (!mrp->sw_backup)
+		return -EOPNOTSUPP;
+
+	if (ocelot->mrp_p_port != dev && ocelot->mrp_s_port != dev)
+		return 0;
+
+	return ocelot_mrp_del_vcap(ocelot, priv->chip_port);
+}
+EXPORT_SYMBOL(ocelot_mrp_del_ring_role);
diff --git a/drivers/net/ethernet/mscc/ocelot_net.c b/drivers/net/ethernet/mscc/ocelot_net.c
index 6518262532f0..12cb6867a2d0 100644
--- a/drivers/net/ethernet/mscc/ocelot_net.c
+++ b/drivers/net/ethernet/mscc/ocelot_net.c
@@ -1010,6 +1010,52 @@ static int ocelot_port_obj_del_mdb(struct net_device *dev,
 	return ocelot_port_mdb_del(ocelot, port, mdb);
 }
 
+static int ocelot_port_obj_mrp_add(struct net_device *dev,
+				   const struct switchdev_obj_mrp *mrp)
+{
+	struct ocelot_port_private *priv = netdev_priv(dev);
+	struct ocelot_port *ocelot_port = &priv->port;
+	struct ocelot *ocelot = ocelot_port->ocelot;
+	int port = priv->chip_port;
+
+	return ocelot_mrp_add(ocelot, port, mrp);
+}
+
+static int ocelot_port_obj_mrp_del(struct net_device *dev,
+				   const struct switchdev_obj_mrp *mrp)
+{
+	struct ocelot_port_private *priv = netdev_priv(dev);
+	struct ocelot_port *ocelot_port = &priv->port;
+	struct ocelot *ocelot = ocelot_port->ocelot;
+	int port = priv->chip_port;
+
+	return ocelot_mrp_del(ocelot, port, mrp);
+}
+
+static int
+ocelot_port_obj_mrp_add_ring_role(struct net_device *dev,
+				  const struct switchdev_obj_ring_role_mrp *mrp)
+{
+	struct ocelot_port_private *priv = netdev_priv(dev);
+	struct ocelot_port *ocelot_port = &priv->port;
+	struct ocelot *ocelot = ocelot_port->ocelot;
+	int port = priv->chip_port;
+
+	return ocelot_mrp_add_ring_role(ocelot, port, mrp);
+}
+
+static int
+ocelot_port_obj_mrp_del_ring_role(struct net_device *dev,
+				  const struct switchdev_obj_ring_role_mrp *mrp)
+{
+	struct ocelot_port_private *priv = netdev_priv(dev);
+	struct ocelot_port *ocelot_port = &priv->port;
+	struct ocelot *ocelot = ocelot_port->ocelot;
+	int port = priv->chip_port;
+
+	return ocelot_mrp_del_ring_role(ocelot, port, mrp);
+}
+
 static int ocelot_port_obj_add(struct net_device *dev,
 			       const struct switchdev_obj *obj,
 			       struct netlink_ext_ack *extack)
@@ -1024,6 +1070,13 @@ static int ocelot_port_obj_add(struct net_device *dev,
 	case SWITCHDEV_OBJ_ID_PORT_MDB:
 		ret = ocelot_port_obj_add_mdb(dev, SWITCHDEV_OBJ_PORT_MDB(obj));
 		break;
+	case SWITCHDEV_OBJ_ID_MRP:
+		ret = ocelot_port_obj_mrp_add(dev, SWITCHDEV_OBJ_MRP(obj));
+		break;
+	case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
+		ret = ocelot_port_obj_mrp_add_ring_role(dev,
+							SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
+		break;
 	default:
 		return -EOPNOTSUPP;
 	}
@@ -1044,6 +1097,13 @@ static int ocelot_port_obj_del(struct net_device *dev,
 	case SWITCHDEV_OBJ_ID_PORT_MDB:
 		ret = ocelot_port_obj_del_mdb(dev, SWITCHDEV_OBJ_PORT_MDB(obj));
 		break;
+	case SWITCHDEV_OBJ_ID_MRP:
+		ret = ocelot_port_obj_mrp_del(dev, SWITCHDEV_OBJ_MRP(obj));
+		break;
+	case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
+		ret = ocelot_port_obj_mrp_del_ring_role(dev,
+							SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
+		break;
 	default:
 		return -EOPNOTSUPP;
 	}