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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
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