net: ocelot: Extend MRP

This patch extends MRP support for Ocelot. It allows to have multiple
rings and when the node has the MRC role it forwards MRP Test frames in
HW. For MRM there is no change.

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

2 files changed, 158 insertions, 81 deletions

diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
index f74d7cf002a5..9cc9378157e4 100644
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -772,12 +772,6 @@ int ocelot_xtr_poll_frame(struct ocelot *ocelot, int grp, struct sk_buff **nskb)
 
 	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
index 683da320bfd8..439129a65b71 100644
--- a/drivers/net/ethernet/mscc/ocelot_mrp.c
+++ b/drivers/net/ethernet/mscc/ocelot_mrp.c
@@ -1,9 +1,6 @@
 // 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
  */
@@ -15,13 +12,34 @@
 #include "ocelot.h"
 #include "ocelot_vcap.h"
 
-static int ocelot_mrp_del_vcap(struct ocelot *ocelot, int port)
+static const u8 mrp_test_dmac[] = { 0x01, 0x15, 0x4e, 0x00, 0x00, 0x01 };
+static const u8 mrp_control_dmac[] = { 0x01, 0x15, 0x4e, 0x00, 0x00, 0x02 };
+
+static int ocelot_mrp_find_partner_port(struct ocelot *ocelot,
+					struct ocelot_port *p)
+{
+	int i;
+
+	for (i = 0; i < ocelot->num_phys_ports; ++i) {
+		struct ocelot_port *ocelot_port = ocelot->ports[i];
+
+		if (!ocelot_port || p == ocelot_port)
+			continue;
+
+		if (ocelot_port->mrp_ring_id == p->mrp_ring_id)
+			return i;
+	}
+
+	return -1;
+}
+
+static int ocelot_mrp_del_vcap(struct ocelot *ocelot, int id)
 {
 	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,
+	filter = ocelot_vcap_block_find_filter_by_id(block_vcap_is2, id,
 						     false);
 	if (!filter)
 		return 0;
@@ -29,6 +47,87 @@ static int ocelot_mrp_del_vcap(struct ocelot *ocelot, int port)
 	return ocelot_vcap_filter_del(ocelot, filter);
 }
 
+static int ocelot_mrp_redirect_add_vcap(struct ocelot *ocelot, int src_port,
+					int dst_port)
+{
+	const u8 mrp_test_mask[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
+	struct ocelot_vcap_filter *filter;
+	int err;
+
+	filter = kzalloc(sizeof(*filter), GFP_KERNEL);
+	if (!filter)
+		return -ENOMEM;
+
+	filter->key_type = OCELOT_VCAP_KEY_ETYPE;
+	filter->prio = 1;
+	filter->id.cookie = src_port;
+	filter->id.tc_offload = false;
+	filter->block_id = VCAP_IS2;
+	filter->type = OCELOT_VCAP_FILTER_OFFLOAD;
+	filter->ingress_port_mask = BIT(src_port);
+	ether_addr_copy(filter->key.etype.dmac.value, mrp_test_dmac);
+	ether_addr_copy(filter->key.etype.dmac.mask, mrp_test_mask);
+	filter->action.mask_mode = OCELOT_MASK_MODE_REDIRECT;
+	filter->action.port_mask = BIT(dst_port);
+
+	err = ocelot_vcap_filter_add(ocelot, filter, NULL);
+	if (err)
+		kfree(filter);
+
+	return err;
+}
+
+static int ocelot_mrp_copy_add_vcap(struct ocelot *ocelot, int port,
+				    int prio, unsigned long cookie)
+{
+	const u8 mrp_mask[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 };
+	struct ocelot_vcap_filter *filter;
+	int err;
+
+	filter = kzalloc(sizeof(*filter), GFP_KERNEL);
+	if (!filter)
+		return -ENOMEM;
+
+	filter->key_type = OCELOT_VCAP_KEY_ETYPE;
+	filter->prio = prio;
+	filter->id.cookie = cookie;
+	filter->id.tc_offload = false;
+	filter->block_id = VCAP_IS2;
+	filter->type = OCELOT_VCAP_FILTER_OFFLOAD;
+	filter->ingress_port_mask = BIT(port);
+	/* Here is possible to use control or test dmac because the mask
+	 * doesn't cover the LSB
+	 */
+	ether_addr_copy(filter->key.etype.dmac.value, mrp_test_dmac);
+	ether_addr_copy(filter->key.etype.dmac.mask, mrp_mask);
+	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;
+}
+
+static void ocelot_mrp_save_mac(struct ocelot *ocelot,
+				struct ocelot_port *port)
+{
+	ocelot_mact_learn(ocelot, PGID_BLACKHOLE, mrp_test_dmac,
+			  port->pvid_vlan.vid, ENTRYTYPE_LOCKED);
+	ocelot_mact_learn(ocelot, PGID_BLACKHOLE, mrp_control_dmac,
+			  port->pvid_vlan.vid, ENTRYTYPE_LOCKED);
+}
+
+static void ocelot_mrp_del_mac(struct ocelot *ocelot,
+			       struct ocelot_port *port)
+{
+	ocelot_mact_forget(ocelot, mrp_test_dmac, port->pvid_vlan.vid);
+	ocelot_mact_forget(ocelot, mrp_control_dmac, port->pvid_vlan.vid);
+}
+
 int ocelot_mrp_add(struct ocelot *ocelot, int port,
 		   const struct switchdev_obj_mrp *mrp)
 {
@@ -45,18 +144,7 @@ int ocelot_mrp_add(struct ocelot *ocelot, int port,
 	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;
+	ocelot_port->mrp_ring_id = mrp->ring_id;
 
 	return 0;
 }
@@ -66,34 +154,31 @@ 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;
+	int i;
 
 	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)
+	if (ocelot_port->mrp_ring_id != mrp->ring_id)
 		return 0;
 
-	if (ocelot->mrp_ring_id == 0 &&
-	    !ocelot->mrp_s_port &&
-	    !ocelot->mrp_p_port)
-		return -EINVAL;
+	ocelot_mrp_del_vcap(ocelot, port);
+	ocelot_mrp_del_vcap(ocelot, port + ocelot->num_phys_ports);
 
-	if (ocelot_mrp_del_vcap(ocelot, priv->chip_port))
-		return -EINVAL;
+	ocelot_port->mrp_ring_id = 0;
 
-	if (ocelot->mrp_p_port == dev)
-		ocelot->mrp_p_port = NULL;
+	for (i = 0; i < ocelot->num_phys_ports; ++i) {
+		ocelot_port = ocelot->ports[i];
 
-	if (ocelot->mrp_s_port == dev)
-		ocelot->mrp_s_port = NULL;
+		if (!ocelot_port)
+			continue;
 
-	ocelot->mrp_ring_id = 0;
+		if (ocelot_port->mrp_ring_id != 0)
+			goto out;
+	}
 
+	ocelot_mrp_del_mac(ocelot, ocelot_port);
+out:
 	return 0;
 }
 EXPORT_SYMBOL(ocelot_mrp_del);
@@ -102,49 +187,39 @@ 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 dst_port;
 	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)
+	if (mrp->ring_role != BR_MRP_RING_ROLE_MRC && !mrp->sw_backup)
 		return -EOPNOTSUPP;
 
-	if (ocelot->mrp_p_port != dev && ocelot->mrp_s_port != dev)
+	if (ocelot_port->mrp_ring_id != mrp->ring_id)
 		return 0;
 
-	filter = kzalloc(sizeof(*filter), GFP_ATOMIC);
-	if (!filter)
-		return -ENOMEM;
+	ocelot_mrp_save_mac(ocelot, ocelot_port);
 
-	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;
+	if (mrp->ring_role != BR_MRP_RING_ROLE_MRC)
+		return ocelot_mrp_copy_add_vcap(ocelot, port, 1, port);
 
-	err = ocelot_vcap_filter_add(ocelot, filter, NULL);
+	dst_port = ocelot_mrp_find_partner_port(ocelot, ocelot_port);
+	if (dst_port == -1)
+		return -EINVAL;
+
+	err = ocelot_mrp_redirect_add_vcap(ocelot, port, dst_port);
 	if (err)
-		kfree(filter);
+		return err;
 
-	return err;
+	err = ocelot_mrp_copy_add_vcap(ocelot, port, 2,
+				       port + ocelot->num_phys_ports);
+	if (err) {
+		ocelot_mrp_del_vcap(ocelot, port);
+		return err;
+	}
+
+	return 0;
 }
 EXPORT_SYMBOL(ocelot_mrp_add_ring_role);
 
@@ -152,24 +227,32 @@ 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;
+	int i;
 
 	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)
+	if (mrp->ring_role != BR_MRP_RING_ROLE_MRC && !mrp->sw_backup)
 		return -EOPNOTSUPP;
 
-	if (ocelot->mrp_p_port != dev && ocelot->mrp_s_port != dev)
+	if (ocelot_port->mrp_ring_id != mrp->ring_id)
 		return 0;
 
-	return ocelot_mrp_del_vcap(ocelot, priv->chip_port);
+	ocelot_mrp_del_vcap(ocelot, port);
+	ocelot_mrp_del_vcap(ocelot, port + ocelot->num_phys_ports);
+
+	for (i = 0; i < ocelot->num_phys_ports; ++i) {
+		ocelot_port = ocelot->ports[i];
+
+		if (!ocelot_port)
+			continue;
+
+		if (ocelot_port->mrp_ring_id != 0)
+			goto out;
+	}
+
+	ocelot_mrp_del_mac(ocelot, ocelot_port);
+out:
+	return 0;
 }
 EXPORT_SYMBOL(ocelot_mrp_del_ring_role);