X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=lib%2Fnetdev-provider.h;h=4148c6cfda96732465de3f921ab0a28581a2cf5d;hb=149f577a25508779b756515be1f1bdcefa3710fa;hp=3bc7fd4448be0e3f324b76f78c5efbdd004c913a;hpb=d17ee8689bff22541dccaa792b70a848641f3646;p=sliver-openvswitch.git diff --git a/lib/netdev-provider.h b/lib/netdev-provider.h index 3bc7fd444..4148c6cfd 100644 --- a/lib/netdev-provider.h +++ b/lib/netdev-provider.h @@ -1,5 +1,5 @@ /* - * Copyright (c) 2009 Nicira Networks. + * Copyright (c) 2009, 2010 Nicira Networks. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. @@ -20,27 +20,55 @@ /* Generic interface to network devices. */ #include + #include "netdev.h" #include "list.h" +#include "shash.h" /* A network device (e.g. an Ethernet device). * * This structure should be treated as opaque by network device * implementations. */ +struct netdev_dev { + char *name; /* Name of network device. */ + const struct netdev_class *class; /* Functions to control this device. */ + int ref_cnt; /* Times this devices was opened. */ + struct shash_node *node; /* Pointer to element in global map. */ + uint32_t args_hash; /* Hash of arguments for the device. */ +}; + +void netdev_dev_init(struct netdev_dev *, const char *name, + const struct netdev_class *); +void netdev_dev_uninit(struct netdev_dev *, bool destroy); +const char *netdev_dev_get_type(const struct netdev_dev *); +const char *netdev_dev_get_name(const struct netdev_dev *); + +static inline void netdev_dev_assert_class(const struct netdev_dev *netdev_dev, + const struct netdev_class *class) +{ + assert(netdev_dev->class == class); +} + +/* A instance of an open network device. + * + * This structure should be treated as opaque by network device + * implementations. */ struct netdev { - const struct netdev_class *class; - char *name; /* e.g. "eth0" */ + struct netdev_dev *netdev_dev; /* Parent netdev_dev. */ + struct list node; /* Element in global list. */ + enum netdev_flags save_flags; /* Initial device flags. */ enum netdev_flags changed_flags; /* Flags that we changed. */ - struct list node; /* Element in global list. */ }; -void netdev_init(struct netdev *, const char *name, - const struct netdev_class *); +void netdev_init(struct netdev *, struct netdev_dev *); +void netdev_uninit(struct netdev *, bool close); +struct netdev_dev *netdev_get_dev(const struct netdev *); + static inline void netdev_assert_class(const struct netdev *netdev, const struct netdev_class *class) { - assert(netdev->class == class); + netdev_dev_assert_class(netdev_get_dev(netdev), class); } /* A network device notifier. @@ -62,15 +90,13 @@ void netdev_notifier_init(struct netdev_notifier *, struct netdev *, * These functions return 0 if successful or a positive errno value on failure, * except where otherwise noted. */ struct netdev_class { - /* Prefix for names of netdevs in this class, e.g. "ndunix:". + /* Type of netdevs in this class, e.g. "system", "tap", "gre", etc. * - * One netdev class may have the empty string "" as its prefix, in which - * case that netdev class is associated with netdev names that do not - * contain a colon. */ - const char *prefix; - - /* Class name, for use in error messages. */ - const char *name; + * One of the providers should supply a "system" type, since this is + * the type assumed if no type is specified when opening a netdev. + * The "system" type corresponds to an existing network device on + * the system. */ + const char *type; /* Called only once, at program startup. Returning an error from this * function will prevent any network device in this class from being @@ -88,18 +114,35 @@ struct netdev_class { * to be called. May be null if nothing is needed here. */ void (*wait)(void); - /* Attempts to open a network device. On success, sets '*netdevp' to the - * new network device. 'name' is the full network device name provided by - * the user. This name is useful for error messages but must not be - * modified. + /* Attempts to create a network device of 'type' with 'name'. + * 'type' corresponds to the 'type' field used in the netdev_class + * structure. On success sets 'netdev_devp' to the newly created device. */ + int (*create)(const char *name, const char *type, const struct shash *args, + struct netdev_dev **netdev_devp); + + /* Destroys 'netdev_dev'. * - * 'suffix' is a copy of 'name' following the netdev's 'prefix'. + * Netdev devices maintain a reference count that is incremented on + * netdev_open() and decremented on netdev_close(). If 'netdev_dev' + * has a non-zero reference count, then this function will not be + * called. */ + void (*destroy)(struct netdev_dev *netdev_dev); + + /* Reconfigures the device 'netdev_dev' with 'args'. + * + * If this netdev class does not support reconfiguring a netdev + * device, this may be a null pointer. + */ + int (*reconfigure)(struct netdev_dev *netdev_dev, const struct shash *args); + + /* Attempts to open a network device. On success, sets 'netdevp' + * to the new network device. * * 'ethertype' may be a 16-bit Ethernet protocol value in host byte order * to capture frames of that type received on the device. It may also be * one of the 'enum netdev_pseudo_ethertype' values to receive frames in * one of those categories. */ - int (*open)(const char *name, char *suffix, int ethertype, + int (*open)(struct netdev_dev *netdev_dev, int ethertype, struct netdev **netdevp); /* Closes 'netdev'. */ @@ -162,7 +205,17 @@ struct netdev_class { * The MTU is the maximum size of transmitted (and received) packets, in * bytes, not including the hardware header; thus, this is typically 1500 * bytes for Ethernet devices.*/ - int (*get_mtu)(const struct netdev *, int *mtup); + int (*get_mtu)(const struct netdev *netdev, int *mtup); + + /* Returns the ifindex of 'netdev', if successful, as a positive number. + * On failure, returns a negative errno value. + * + * The desired semantics of the ifindex value are a combination of those + * specified by POSIX for if_nametoindex() and by SNMP for ifIndex. An + * ifindex value should be unique within a host and remain stable at least + * until reboot. SNMP says an ifindex "ranges between 1 and the value of + * ifNumber" but many systems do not follow this rule anyhow. */ + int (*get_ifindex)(const struct netdev *netdev); /* Sets 'carrier' to true if carrier is active (link light is on) on * 'netdev'. */ @@ -173,7 +226,7 @@ struct netdev_class { * A network device that supports some statistics but not others, it should * set the values of the unsupported statistics to all-1-bits * (UINT64_MAX). */ - int (*get_stats)(const struct netdev *netdev, struct netdev_stats *stats); + int (*get_stats)(const struct netdev *netdev, struct netdev_stats *); /* Stores the features supported by 'netdev' into each of '*current', * '*advertised', '*supported', and '*peer'. Each value is a bitmap of @@ -187,14 +240,14 @@ struct netdev_class { * * This function may be set to null for a network device that does not * support configuring advertisements. */ - int (*set_advertisements)(struct netdev *, uint32_t advertise); + int (*set_advertisements)(struct netdev *netdev, uint32_t advertise); /* If 'netdev' is a VLAN network device (e.g. one created with vconfig(8)), * sets '*vlan_vid' to the VLAN VID associated with that device and returns * 0. * - * Returns ENOENT if 'netdev_name' is the name of a network device that is - * not a VLAN device. + * Returns ENOENT if 'netdev' is a network device that is not a + * VLAN device. * * This function should be set to null if it doesn't make any sense for * your network device (it probably doesn't). */ @@ -227,7 +280,8 @@ struct netdev_class { * * This function may be set to null if it would always return EOPNOTSUPP * anyhow. */ - int (*set_in4)(struct netdev *, struct in_addr addr, struct in_addr mask); + int (*set_in4)(struct netdev *netdev, struct in_addr addr, + struct in_addr mask); /* If 'netdev' has an assigned IPv6 address, sets '*in6' to that address. * @@ -266,12 +320,12 @@ struct netdev_class { * * This function may be set to null if it would always return EOPNOTSUPP * anyhow. */ - int (*arp_lookup)(const struct netdev *, uint32_t ip, uint8_t mac[6]); + int (*arp_lookup)(const struct netdev *netdev, uint32_t ip, uint8_t mac[6]); - /* Retrieves the current set of flags on 'netdev' into '*old_flags'. Then, - * turns off the flags that are set to 1 in 'off' and turns on the flags - * that are set to 1 in 'on'. (No bit will be set to 1 in both 'off' and - * 'on'; that is, off & on == 0.) + /* Retrieves the current set of flags on 'netdev' into '*old_flags'. + * Then, turns off the flags that are set to 1 in 'off' and turns on the + * flags that are set to 1 in 'on'. (No bit will be set to 1 in both 'off' + * and 'on'; that is, off & on == 0.) * * This function may be invoked from a signal handler. Therefore, it * should not do anything that is not signal-safe (such as logging). */ @@ -284,7 +338,7 @@ struct netdev_class { * will have its 'netdev', 'cb', and 'aux' members set to the values of the * corresponding parameters. */ int (*poll_add)(struct netdev *netdev, - void (*cb)(struct netdev_notifier *), void *aux, + void (*cb)(struct netdev_notifier *notifier), void *aux, struct netdev_notifier **notifierp); /* Cancels poll notification for 'notifier'. */ @@ -293,5 +347,6 @@ struct netdev_class { extern const struct netdev_class netdev_linux_class; extern const struct netdev_class netdev_tap_class; +extern const struct netdev_class netdev_gre_class; #endif /* netdev.h */