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+/*
+ * swlib.h: Switch configuration API (user space part)
+ *
+ * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * version 2.1 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+
+Usage of the library functions:
+
+ The main datastructure for a switch is the struct switch_device
+ To get started, you first need to use switch_connect() to probe
+ for switches and allocate an instance of this struct.
+
+ There are two possible usage modes:
+ dev = switch_connect("eth0");
+ - this call will look for a switch registered for the linux device
+ "eth0" and only allocate a switch_device for this particular switch.
+
+ dev = switch_connect(NULL)
+ - this will return one switch_device struct for each available
+ switch. The switch_device structs are chained with by ->next pointer
+
+ Then to query a switch for all available attributes, use:
+ swlib_scan(dev);
+
+ All allocated datastructures for the switch_device struct can be freed with
+ swlib_free(dev);
+ or
+ swlib_free_all(dev);
+
+ The latter traverses a whole chain of switch_device structs and frees them all
+
+ Switch attributes (struct switch_attr) are divided into three groups:
+ dev->ops:
+ - global settings
+ dev->port_ops:
+ - per-port settings
+ dev->vlan_ops:
+ - per-vlan settings
+
+ switch_lookup_attr() is a small helper function to locate attributes
+ by name.
+
+ switch_set_attr() and switch_get_attr() can alter or request the values
+ of attributes.
+
+Usage of the switch_attr struct:
+
+ ->atype: attribute group, one of:
+ - SWLIB_ATTR_GROUP_GLOBAL
+ - SWLIB_ATTR_GROUP_VLAN
+ - SWLIB_ATTR_GROUP_PORT
+
+ ->id: identifier for the attribute
+
+ ->type: data type, one of:
+ - SWITCH_TYPE_INT
+ - SWITCH_TYPE_STRING
+ - SWITCH_TYPE_PORT
+
+ ->name: short name of the attribute
+ ->description: longer description
+ ->next: pointer to the next attribute of the current group
+
+
+Usage of the switch_val struct:
+
+ When setting attributes, following members of the struct switch_val need
+ to be set up:
+
+ ->len (for attr->type == SWITCH_TYPE_PORT)
+ ->port_vlan:
+ - port number (for attr->atype == SWLIB_ATTR_GROUP_PORT), or:
+ - vlan number (for attr->atype == SWLIB_ATTR_GROUP_VLAN)
+ ->value.i (for attr->type == SWITCH_TYPE_INT)
+ ->value.s (for attr->type == SWITCH_TYPE_STRING)
+ - owned by the caller, not stored in the library internally
+ ->value.ports (for attr->type == SWITCH_TYPE_PORT)
+ - must point to an array of at lest val->len * sizeof(struct switch_port)
+
+ When getting string attributes, val->value.s must be freed by the caller
+ When getting port list attributes, an internal static buffer is used,
+ which changes from call to call.
+
+ */
+
+#ifndef __SWLIB_H
+#define __SWLIB_H
+
+enum swlib_attr_group {
+ SWLIB_ATTR_GROUP_GLOBAL,
+ SWLIB_ATTR_GROUP_VLAN,
+ SWLIB_ATTR_GROUP_PORT,
+};
+
+enum swlib_port_flags {
+ SWLIB_PORT_FLAG_TAGGED = (1 << 0),
+};
+
+
+struct switch_dev;
+struct switch_attr;
+struct switch_port;
+struct switch_val;
+
+struct switch_dev {
+ int id;
+ const char *name;
+ const char *dev_name;
+ int ports;
+ int vlans;
+ struct switch_attr *ops;
+ struct switch_attr *port_ops;
+ struct switch_attr *vlan_ops;
+ struct switch_dev *next;
+ void *priv;
+};
+
+struct switch_val {
+ struct switch_attr *attr;
+ int len;
+ int err;
+ int port_vlan;
+ union {
+ const char *s;
+ int i;
+ struct switch_port *ports;
+ } value;
+};
+
+struct switch_attr {
+ struct switch_dev *dev;
+ int atype;
+ int id;
+ int type;
+ const char *name;
+ const char *description;
+ struct switch_attr *next;
+};
+
+struct switch_port {
+ unsigned int id;
+ unsigned int flags;
+};
+
+/**
+ * swlib_connect: connect to the switch through netlink
+ * @name: name of the ethernet interface,
+ *
+ * if name is NULL, it connect and builds a chain of all switches
+ */
+struct switch_dev *swlib_connect(const char *name);
+
+/**
+ * swlib_free: free all dynamically allocated data for the switch connection
+ * @dev: switch device struct
+ *
+ * all members of a switch device chain (generated by swlib_connect(NULL))
+ * must be freed individually
+ */
+void swlib_free(struct switch_dev *dev);
+
+/**
+ * swlib_free_all: run swlib_free on all devices in the chain
+ * @dev: switch device struct
+ */
+void swlib_free_all(struct switch_dev *dev);
+
+/**
+ * swlib_scan: probe the switch driver for available commands/attributes
+ * @dev: switch device struct
+ */
+int swlib_scan(struct switch_dev *dev);
+
+/**
+ * swlib_lookup_attr: look up a switch attribute
+ * @dev: switch device struct
+ * @type: global, port or vlan
+ * @name: name of the attribute
+ */
+struct switch_attr *swlib_lookup_attr(struct switch_dev *dev,
+ enum swlib_attr_group atype, const char *name);
+
+/**
+ * swlib_set_attr: set the value for an attribute
+ * @dev: switch device struct
+ * @attr: switch attribute struct
+ * @val: attribute value pointer
+ * returns 0 on success
+ */
+int swlib_set_attr(struct switch_dev *dev, struct switch_attr *attr,
+ struct switch_val *val);
+
+/**
+ * swlib_get_attr: get the value for an attribute
+ * @dev: switch device struct
+ * @attr: switch attribute struct
+ * @val: attribute value pointer
+ * returns 0 on success
+ * for string attributes, the result string must be freed by the caller
+ */
+int swlib_get_attr(struct switch_dev *dev, struct switch_attr *attr,
+ struct switch_val *val);
+
+#endif