mlxsw: spectrum_router: Implement fib4 add/del switchdev obj ops

Implement ipv4 FIB entries addition and removal. Initially, we support
local and broadcast routes using "ip2me" trap action.
Also, unicast routes without nexthop are supported using "local" action.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -476,5 +476,10 @@ static inline void mlxsw_sp_port_dcb_fini(struct mlxsw_sp_port *mlxsw_sp_port)
 
 int mlxsw_sp_router_init(struct mlxsw_sp *mlxsw_sp);
 void mlxsw_sp_router_fini(struct mlxsw_sp *mlxsw_sp);
+int mlxsw_sp_router_fib4_add(struct mlxsw_sp_port *mlxsw_sp_port,
+			     const struct switchdev_obj_ipv4_fib *fib4,
+			     struct switchdev_trans *trans);
+int mlxsw_sp_router_fib4_del(struct mlxsw_sp_port *mlxsw_sp_port,
+			     const struct switchdev_obj_ipv4_fib *fib4);
 
 #endif

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

@@ -106,9 +106,19 @@ struct mlxsw_sp_fib_key {
 	unsigned char prefix_len;
 };
 
+enum mlxsw_sp_fib_entry_type {
+	MLXSW_SP_FIB_ENTRY_TYPE_REMOTE,
+	MLXSW_SP_FIB_ENTRY_TYPE_LOCAL,
+	MLXSW_SP_FIB_ENTRY_TYPE_TRAP,
+};
+
 struct mlxsw_sp_fib_entry {
 	struct rhash_head ht_node;
 	struct mlxsw_sp_fib_key key;
+	enum mlxsw_sp_fib_entry_type type;
+	u8 added:1;
+	u16 rif; /* used for action local */
+	struct mlxsw_sp_vr *vr;
 };
 
 struct mlxsw_sp_fib {
@@ -567,3 +577,238 @@ void mlxsw_sp_router_fini(struct mlxsw_sp *mlxsw_sp)
 {
 	__mlxsw_sp_router_fini(mlxsw_sp);
 }
+
+static int mlxsw_sp_fib_entry_op4_local(struct mlxsw_sp *mlxsw_sp,
+					struct mlxsw_sp_fib_entry *fib_entry,
+					enum mlxsw_reg_ralue_op op)
+{
+	char ralue_pl[MLXSW_REG_RALUE_LEN];
+	u32 *p_dip = (u32 *) fib_entry->key.addr;
+	struct mlxsw_sp_vr *vr = fib_entry->vr;
+
+	mlxsw_reg_ralue_pack4(ralue_pl, vr->proto, op, vr->id,
+			      fib_entry->key.prefix_len, *p_dip);
+	mlxsw_reg_ralue_act_local_pack(ralue_pl,
+				       MLXSW_REG_RALUE_TRAP_ACTION_NOP, 0,
+				       fib_entry->rif);
+	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ralue), ralue_pl);
+}
+
+static int mlxsw_sp_fib_entry_op4_trap(struct mlxsw_sp *mlxsw_sp,
+				       struct mlxsw_sp_fib_entry *fib_entry,
+				       enum mlxsw_reg_ralue_op op)
+{
+	char ralue_pl[MLXSW_REG_RALUE_LEN];
+	u32 *p_dip = (u32 *) fib_entry->key.addr;
+	struct mlxsw_sp_vr *vr = fib_entry->vr;
+
+	mlxsw_reg_ralue_pack4(ralue_pl, vr->proto, op, vr->id,
+			      fib_entry->key.prefix_len, *p_dip);
+	mlxsw_reg_ralue_act_ip2me_pack(ralue_pl);
+	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ralue), ralue_pl);
+}
+
+static int mlxsw_sp_fib_entry_op4(struct mlxsw_sp *mlxsw_sp,
+				  struct mlxsw_sp_fib_entry *fib_entry,
+				  enum mlxsw_reg_ralue_op op)
+{
+	switch (fib_entry->type) {
+	case MLXSW_SP_FIB_ENTRY_TYPE_REMOTE:
+		return -EINVAL;
+	case MLXSW_SP_FIB_ENTRY_TYPE_LOCAL:
+		return mlxsw_sp_fib_entry_op4_local(mlxsw_sp, fib_entry, op);
+	case MLXSW_SP_FIB_ENTRY_TYPE_TRAP:
+		return mlxsw_sp_fib_entry_op4_trap(mlxsw_sp, fib_entry, op);
+	}
+	return -EINVAL;
+}
+
+static int mlxsw_sp_fib_entry_op(struct mlxsw_sp *mlxsw_sp,
+				 struct mlxsw_sp_fib_entry *fib_entry,
+				 enum mlxsw_reg_ralue_op op)
+{
+	switch (fib_entry->vr->proto) {
+	case MLXSW_SP_L3_PROTO_IPV4:
+		return mlxsw_sp_fib_entry_op4(mlxsw_sp, fib_entry, op);
+	case MLXSW_SP_L3_PROTO_IPV6:
+		return -EINVAL;
+	}
+	return -EINVAL;
+}
+
+static int mlxsw_sp_fib_entry_update(struct mlxsw_sp *mlxsw_sp,
+				     struct mlxsw_sp_fib_entry *fib_entry)
+{
+	enum mlxsw_reg_ralue_op op;
+
+	op = !fib_entry->added ? MLXSW_REG_RALUE_OP_WRITE_WRITE :
+				 MLXSW_REG_RALUE_OP_WRITE_UPDATE;
+	return mlxsw_sp_fib_entry_op(mlxsw_sp, fib_entry, op);
+}
+
+static int mlxsw_sp_fib_entry_del(struct mlxsw_sp *mlxsw_sp,
+				  struct mlxsw_sp_fib_entry *fib_entry)
+{
+	return mlxsw_sp_fib_entry_op(mlxsw_sp, fib_entry,
+				     MLXSW_REG_RALUE_OP_WRITE_DELETE);
+}
+
+struct mlxsw_sp_router_fib4_add_info {
+	struct switchdev_trans_item tritem;
+	struct mlxsw_sp *mlxsw_sp;
+	struct mlxsw_sp_fib_entry *fib_entry;
+};
+
+static void mlxsw_sp_router_fib4_add_info_destroy(void const *data)
+{
+	const struct mlxsw_sp_router_fib4_add_info *info = data;
+	struct mlxsw_sp_fib_entry *fib_entry = info->fib_entry;
+	struct mlxsw_sp *mlxsw_sp = info->mlxsw_sp;
+
+	mlxsw_sp_fib_entry_destroy(fib_entry);
+	mlxsw_sp_vr_put(mlxsw_sp, fib_entry->vr);
+	kfree(info);
+}
+
+static int
+mlxsw_sp_router_fib4_entry_init(struct mlxsw_sp *mlxsw_sp,
+				const struct switchdev_obj_ipv4_fib *fib4,
+				struct mlxsw_sp_fib_entry *fib_entry)
+{
+	struct fib_info *fi = fib4->fi;
+
+	if (fib4->type == RTN_LOCAL || fib4->type == RTN_BROADCAST) {
+		fib_entry->type = MLXSW_SP_FIB_ENTRY_TYPE_TRAP;
+		return 0;
+	}
+	if (fib4->type != RTN_UNICAST)
+		return -EINVAL;
+
+	if (fi->fib_scope != RT_SCOPE_UNIVERSE) {
+		struct mlxsw_sp_rif *r;
+
+		fib_entry->type = MLXSW_SP_FIB_ENTRY_TYPE_LOCAL;
+		r = mlxsw_sp_rif_find_by_dev(mlxsw_sp, fi->fib_dev);
+		if (!r)
+			return -EINVAL;
+		fib_entry->rif = r->rif;
+		return 0;
+	}
+	return -EINVAL;
+}
+
+static int
+mlxsw_sp_router_fib4_add_prepare(struct mlxsw_sp_port *mlxsw_sp_port,
+				 const struct switchdev_obj_ipv4_fib *fib4,
+				 struct switchdev_trans *trans)
+{
+	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
+	struct mlxsw_sp_router_fib4_add_info *info;
+	struct mlxsw_sp_fib_entry *fib_entry;
+	struct mlxsw_sp_vr *vr;
+	int err;
+
+	vr = mlxsw_sp_vr_get(mlxsw_sp, fib4->dst_len, fib4->tb_id,
+			     MLXSW_SP_L3_PROTO_IPV4);
+	if (IS_ERR(vr))
+		return PTR_ERR(vr);
+
+	fib_entry = mlxsw_sp_fib_entry_create(vr->fib, &fib4->dst,
+					      sizeof(fib4->dst), fib4->dst_len);
+	if (!fib_entry) {
+		err = -ENOMEM;
+		goto err_fib_entry_create;
+	}
+	fib_entry->vr = vr;
+
+	err = mlxsw_sp_router_fib4_entry_init(mlxsw_sp, fib4, fib_entry);
+	if (err)
+		goto err_fib4_entry_init;
+
+	info = kmalloc(sizeof(*info), GFP_KERNEL);
+	if (!info) {
+		err = -ENOMEM;
+		goto err_alloc_info;
+	}
+	info->mlxsw_sp = mlxsw_sp;
+	info->fib_entry = fib_entry;
+	switchdev_trans_item_enqueue(trans, info,
+				     mlxsw_sp_router_fib4_add_info_destroy,
+				     &info->tritem);
+	return 0;
+
+err_alloc_info:
+err_fib4_entry_init:
+	mlxsw_sp_fib_entry_destroy(fib_entry);
+err_fib_entry_create:
+	mlxsw_sp_vr_put(mlxsw_sp, vr);
+	return err;
+}
+
+static int
+mlxsw_sp_router_fib4_add_commit(struct mlxsw_sp_port *mlxsw_sp_port,
+				const struct switchdev_obj_ipv4_fib *fib4,
+				struct switchdev_trans *trans)
+{
+	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
+	struct mlxsw_sp_router_fib4_add_info *info;
+	struct mlxsw_sp_fib_entry *fib_entry;
+	struct mlxsw_sp_vr *vr;
+	int err;
+
+	info = switchdev_trans_item_dequeue(trans);
+	fib_entry = info->fib_entry;
+	kfree(info);
+
+	vr = fib_entry->vr;
+	err = mlxsw_sp_fib_entry_insert(fib_entry->vr->fib, fib_entry);
+	if (err)
+		goto err_fib_entry_insert;
+	err = mlxsw_sp_fib_entry_update(mlxsw_sp, fib_entry);
+	if (err)
+		goto err_fib_entry_add;
+	return 0;
+
+err_fib_entry_add:
+	mlxsw_sp_fib_entry_remove(vr->fib, fib_entry);
+err_fib_entry_insert:
+	mlxsw_sp_fib_entry_destroy(fib_entry);
+	mlxsw_sp_vr_put(mlxsw_sp, vr);
+	return err;
+}
+
+int mlxsw_sp_router_fib4_add(struct mlxsw_sp_port *mlxsw_sp_port,
+			     const struct switchdev_obj_ipv4_fib *fib4,
+			     struct switchdev_trans *trans)
+{
+	if (switchdev_trans_ph_prepare(trans))
+		return mlxsw_sp_router_fib4_add_prepare(mlxsw_sp_port,
+							fib4, trans);
+	return mlxsw_sp_router_fib4_add_commit(mlxsw_sp_port,
+					       fib4, trans);
+}
+
+int mlxsw_sp_router_fib4_del(struct mlxsw_sp_port *mlxsw_sp_port,
+			     const struct switchdev_obj_ipv4_fib *fib4)
+{
+	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
+	struct mlxsw_sp_fib_entry *fib_entry;
+	struct mlxsw_sp_vr *vr;
+
+	vr = mlxsw_sp_vr_find(mlxsw_sp, fib4->tb_id, MLXSW_SP_L3_PROTO_IPV4);
+	if (!vr) {
+		dev_warn(mlxsw_sp->bus_info->dev, "Failed to find virtual router for FIB4 entry being removed.\n");
+		return -ENOENT;
+	}
+	fib_entry = mlxsw_sp_fib_entry_lookup(vr->fib, &fib4->dst,
+					      sizeof(fib4->dst), fib4->dst_len);
+	if (!fib_entry) {
+		dev_warn(mlxsw_sp->bus_info->dev, "Failed to find FIB4 entry being removed.\n");
+		return PTR_ERR(vr);
+	}
+	mlxsw_sp_fib_entry_del(mlxsw_sp_port->mlxsw_sp, fib_entry);
+	mlxsw_sp_fib_entry_remove(vr->fib, fib_entry);
+	mlxsw_sp_fib_entry_destroy(fib_entry);
+	mlxsw_sp_vr_put(mlxsw_sp, vr);
+	return 0;
+}

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

@@ -978,6 +978,11 @@ static int mlxsw_sp_port_obj_add(struct net_device *dev,
 					      SWITCHDEV_OBJ_PORT_VLAN(obj),
 					      trans);
 		break;
+	case SWITCHDEV_OBJ_ID_IPV4_FIB:
+		err = mlxsw_sp_router_fib4_add(mlxsw_sp_port,
+					       SWITCHDEV_OBJ_IPV4_FIB(obj),
+					       trans);
+		break;
 	case SWITCHDEV_OBJ_ID_PORT_FDB:
 		err = mlxsw_sp_port_fdb_static_add(mlxsw_sp_port,
 						   SWITCHDEV_OBJ_PORT_FDB(obj),
@@ -1123,6 +1128,10 @@ static int mlxsw_sp_port_obj_del(struct net_device *dev,
 		err = mlxsw_sp_port_vlans_del(mlxsw_sp_port,
 					      SWITCHDEV_OBJ_PORT_VLAN(obj));
 		break;
+	case SWITCHDEV_OBJ_ID_IPV4_FIB:
+		err = mlxsw_sp_router_fib4_del(mlxsw_sp_port,
+					       SWITCHDEV_OBJ_IPV4_FIB(obj));
+		break;
 	case SWITCHDEV_OBJ_ID_PORT_FDB:
 		err = mlxsw_sp_port_fdb_static_del(mlxsw_sp_port,
 						   SWITCHDEV_OBJ_PORT_FDB(obj));