X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=lib%2Fnetdev-provider.h;h=1442367db76f6ef6bd2cc8489b9c206766ebc362;hb=d1673b006d53fdea72c0744e835362ed1917f879;hp=3bc7fd4448be0e3f324b76f78c5efbdd004c913a;hpb=362424c31e44722e3816e646943e22991ff9a91c;p=sliver-openvswitch.git diff --git a/lib/netdev-provider.h b/lib/netdev-provider.h index 3bc7fd444..1442367db 100644 --- a/lib/netdev-provider.h +++ b/lib/netdev-provider.h @@ -1,5 +1,5 @@ /* - * Copyright (c) 2009 Nicira Networks. + * Copyright (c) 2009, 2010, 2011, 2012, 2013 Nicira, Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. @@ -19,65 +19,85 @@ /* Generic interface to network devices. */ -#include #include "netdev.h" #include "list.h" +#include "shash.h" +#include "smap.h" + +#ifdef __cplusplus +extern "C" { +#endif /* 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 *netdev_class; /* Functions to control + this device. */ + int ref_cnt; /* Times this devices was opened. */ + struct shash_node *node; /* Pointer to element in global map. */ +}; + +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 struct netdev_class *netdev_dev_get_class(const struct netdev_dev *); +const char *netdev_dev_get_name(const struct netdev_dev *); +struct netdev_dev *netdev_dev_from_name(const char *name); +void netdev_dev_get_devices(const struct netdev_class *, + struct shash *device_list); + +static inline void netdev_dev_assert_class(const struct netdev_dev *netdev_dev, + const struct netdev_class *class_) +{ + ovs_assert(netdev_dev->netdev_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) + const struct netdev_class *netdev_class) { - assert(netdev->class == class); + netdev_dev_assert_class(netdev_get_dev(netdev), netdev_class); } -/* A network device notifier. - * - * Network device implementations should use netdev_notifier_init() to - * initialize this structure, but they may freely read its members after - * initialization. */ -struct netdev_notifier { - struct netdev *netdev; - void (*cb)(struct netdev_notifier *); - void *aux; -}; -void netdev_notifier_init(struct netdev_notifier *, struct netdev *, - void (*cb)(struct netdev_notifier *), void *aux); - /* Network device class structure, to be defined by each implementation of a * network device. * * 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; - - /* Called only once, at program startup. Returning an error from this - * function will prevent any network device in this class from being - * opened. + * 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 when the netdev provider is registered, typically at program + * startup. Returning an error from this function will prevent any network + * device in this class from being opened. * * This function may be set to null if a network device class needs no - * initialization at program startup. */ + * initialization at registration time. */ int (*init)(void); /* Performs periodic work needed by netdevs of this class. May be null if @@ -85,50 +105,103 @@ struct netdev_class { void (*run)(void); /* Arranges for poll_block() to wake up if the "run" member function needs - * to be called. May be null if nothing is needed here. */ + * to be called. Implementations are additionally required to wake + * whenever something changes in any of its netdevs which would cause their + * ->change_seq() function to change its result. 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 named 'name' in 'netdev_class'. On + * success sets 'netdev_devp' to the newly created device. */ + int (*create)(const struct netdev_class *netdev_class, const char *name, + 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); + + /* Fetches the device 'netdev_dev''s configuration, storing it in 'args'. + * The caller owns 'args' and pre-initializes it to an empty smap. * - * '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, - struct netdev **netdevp); + * If this netdev class does not have any configuration options, this may + * be a null pointer. */ + int (*get_config)(struct netdev_dev *netdev_dev, struct smap *args); - /* Closes 'netdev'. */ - void (*close)(struct netdev *netdev); - - /* Enumerates the names of all network devices of this class. + /* Changes the device 'netdev_dev''s configuration to 'args'. * - * The caller has already initialized 'all_names' and might already have - * added some names to it. This function should not disturb any existing - * names in 'all_names'. - * - * If this netdev class does not support enumeration, this may be a null + * If this netdev class does not support configuration, this may be a null * pointer. */ - int (*enumerate)(struct svec *all_names); + int (*set_config)(struct netdev_dev *netdev_dev, const struct smap *args); + + /* Returns the tunnel configuration of 'netdev_dev'. If 'netdev_dev' is + * not a tunnel, returns null. + * + * If this function would always return null, it may be null instead. */ + const struct netdev_tunnel_config * + (*get_tunnel_config)(const struct netdev_dev *netdev_dev); + + /* Attempts to open a network device. On success, sets 'netdevp' + * to the new network device. */ + int (*open)(struct netdev_dev *netdev_dev, struct netdev **netdevp); + + /* Closes 'netdev'. */ + void (*close)(struct netdev *netdev); + +/* ## ----------------- ## */ +/* ## Receiving Packets ## */ +/* ## ----------------- ## */ + +/* The network provider interface is mostly used for inspecting and configuring + * device "metadata", not for sending and receiving packets directly. It may + * be impractical to implement these functions on some operating systems and + * hardware. These functions may all be NULL in such cases. + * + * (However, the "dpif-netdev" implementation, which is the easiest way to + * integrate Open vSwitch with a new operating system or hardware, does require + * the ability to receive packets.) */ + + /* Attempts to set up 'netdev' for receiving packets with ->recv(). + * Returns 0 if successful, otherwise a positive errno value. Return + * EOPNOTSUPP to indicate that the network device does not implement packet + * reception through this interface. This function may be set to null if + * it would always return EOPNOTSUPP anyhow. (This will prevent the + * network device from being usefully used by the netdev-based "userspace + * datapath".)*/ + int (*listen)(struct netdev *netdev); /* Attempts to receive a packet from 'netdev' into the 'size' bytes in * 'buffer'. If successful, returns the number of bytes in the received * packet, otherwise a negative errno value. Returns -EAGAIN immediately - * if no packet is ready to be received. */ + * if no packet is ready to be received. + * + * Returns -EMSGSIZE, and discards the packet, if the received packet is + * longer than 'size' bytes. + * + * This function can only be expected to return a packet if ->listen() has + * been called successfully. + * + * May be null if not needed, such as for a network device that does not + * implement packet reception through the 'recv' member function. */ int (*recv)(struct netdev *netdev, void *buffer, size_t size); /* Registers with the poll loop to wake up from the next call to * poll_block() when a packet is ready to be received with netdev_recv() on - * 'netdev'. */ + * 'netdev'. + * + * May be null if not needed, such as for a network device that does not + * implement packet reception through the 'recv' member function. */ void (*recv_wait)(struct netdev *netdev); - /* Discards all packets waiting to be received from 'netdev'. */ + /* Discards all packets waiting to be received from 'netdev'. + * + * May be null if not needed, such as for a network device that does not + * implement packet reception through the 'recv' member function. */ int (*drain)(struct netdev *netdev); - + /* Sends the 'size'-byte packet in 'buffer' on 'netdev'. Returns 0 if * successful, otherwise a positive errno value. Returns EAGAIN without * blocking if the packet cannot be queued immediately. Returns EMSGSIZE @@ -139,7 +212,14 @@ struct netdev_class { * * The network device is expected to maintain a packet transmission queue, * so that the caller does not ordinarily have to do additional queuing of - * packets. */ + * packets. + * + * May return EOPNOTSUPP if a network device does not implement packet + * transmission through this interface. This function may be set to null + * if it would always return EOPNOTSUPP anyhow. (This will prevent the + * network device from being usefully used by the netdev-based "userspace + * datapath". It will also prevent the OVS implementation of bonding from + * working properly over 'netdev'.) */ int (*send)(struct netdev *netdev, const void *buffer, size_t size); /* Registers with the poll loop to wake up from the next call to @@ -148,57 +228,112 @@ struct netdev_class { * * The network device is expected to maintain a packet transmission queue, * so that the caller does not ordinarily have to do additional queuing of - * packets. Thus, this function is unlikely to ever be useful. */ + * packets. Thus, this function is unlikely to ever be useful. + * + * May be null if not needed, such as for a network device that does not + * implement packet transmission through the 'send' member function. */ void (*send_wait)(struct netdev *netdev); /* Sets 'netdev''s Ethernet address to 'mac' */ int (*set_etheraddr)(struct netdev *netdev, const uint8_t mac[6]); - /* Retrieves 'netdev''s Ethernet address into 'mac'. */ + /* Retrieves 'netdev''s Ethernet address into 'mac'. + * + * This address will be advertised as 'netdev''s MAC address through the + * OpenFlow protocol, among other uses. */ int (*get_etheraddr)(const struct netdev *netdev, uint8_t mac[6]); /* Retrieves 'netdev''s MTU into '*mtup'. * * 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); + * bytes for Ethernet devices. + * + * If 'netdev' does not have an MTU (e.g. as some tunnels do not), then + * this function should return EOPNOTSUPP. This function may be set to + * null if it would always return EOPNOTSUPP. */ + int (*get_mtu)(const struct netdev *netdev, int *mtup); + + /* Sets 'netdev''s MTU to 'mtu'. + * + * If 'netdev' does not have an MTU (e.g. as some tunnels do not), then + * this function should return EOPNOTSUPP. This function may be set to + * null if it would always return EOPNOTSUPP. */ + int (*set_mtu)(const struct netdev *netdev, int mtu); + + /* 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. + * + * This function may be set to null if it would always return -EOPNOTSUPP. + */ + int (*get_ifindex)(const struct netdev *netdev); /* Sets 'carrier' to true if carrier is active (link light is on) on - * 'netdev'. */ + * 'netdev'. + * + * May be null if device does not provide carrier status (will be always + * up as long as device is up). + */ int (*get_carrier)(const struct netdev *netdev, bool *carrier); + /* Returns the number of times 'netdev''s carrier has changed since being + * initialized. + * + * If null, callers will assume the number of carrier resets is zero. */ + long long int (*get_carrier_resets)(const struct netdev *netdev); + + /* Forces ->get_carrier() to poll 'netdev''s MII registers for link status + * instead of checking 'netdev''s carrier. 'netdev''s MII registers will + * be polled once ever 'interval' milliseconds. If 'netdev' does not + * support MII, another method may be used as a fallback. If 'interval' is + * less than or equal to zero, reverts ->get_carrier() to its normal + * behavior. + * + * Most network devices won't support this feature and will set this + * function pointer to NULL, which is equivalent to returning EOPNOTSUPP. + */ + int (*set_miimon_interval)(struct netdev *netdev, long long int interval); + /* Retrieves current device stats for 'netdev' into 'stats'. * * 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 *); + + /* Sets the device stats for 'netdev' to 'stats'. + * + * Most network devices won't support this feature and will set this + * function pointer to NULL, which is equivalent to returning EOPNOTSUPP. + * + * Some network devices might only allow setting their stats to 0. */ + int (*set_stats)(struct netdev *netdev, const struct netdev_stats *); /* Stores the features supported by 'netdev' into each of '*current', * '*advertised', '*supported', and '*peer'. Each value is a bitmap of - * "enum ofp_port_features" bits, in host byte order. */ - int (*get_features)(struct netdev *netdev, - uint32_t *current, uint32_t *advertised, - uint32_t *supported, uint32_t *peer); + * NETDEV_F_* bits. + * + * This function may be set to null if it would always return EOPNOTSUPP. + */ + int (*get_features)(const struct netdev *netdev, + enum netdev_features *current, + enum netdev_features *advertised, + enum netdev_features *supported, + enum netdev_features *peer); /* Set the features advertised by 'netdev' to 'advertise', which is a - * bitmap of "enum ofp_port_features" bits, in host byte order. + * set of NETDEV_F_* bits. * * 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); - - /* 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. - * - * This function should be set to null if it doesn't make any sense for - * your network device (it probably doesn't). */ - int (*get_vlan_vid)(const struct netdev *netdev, int *vlan_vid); + int (*set_advertisements)(struct netdev *netdev, + enum netdev_features advertise); /* Attempts to set input rate limiting (policing) policy, such that up to * 'kbits_rate' kbps of traffic is accepted, with a maximum accumulative @@ -208,6 +343,160 @@ struct netdev_class { int (*set_policing)(struct netdev *netdev, unsigned int kbits_rate, unsigned int kbits_burst); + /* Adds to 'types' all of the forms of QoS supported by 'netdev', or leaves + * it empty if 'netdev' does not support QoS. Any names added to 'types' + * should be documented as valid for the "type" column in the "QoS" table + * in vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)). + * + * Every network device must support disabling QoS with a type of "", but + * this function must not add "" to 'types'. + * + * The caller is responsible for initializing 'types' (e.g. with + * sset_init()) before calling this function. The caller retains ownership + * of 'types'. + * + * May be NULL if 'netdev' does not support QoS at all. */ + int (*get_qos_types)(const struct netdev *netdev, struct sset *types); + + /* Queries 'netdev' for its capabilities regarding the specified 'type' of + * QoS. On success, initializes 'caps' with the QoS capabilities. + * + * Should return EOPNOTSUPP if 'netdev' does not support 'type'. May be + * NULL if 'netdev' does not support QoS at all. */ + int (*get_qos_capabilities)(const struct netdev *netdev, + const char *type, + struct netdev_qos_capabilities *caps); + + /* Queries 'netdev' about its currently configured form of QoS. If + * successful, stores the name of the current form of QoS into '*typep' + * and any details of configuration as string key-value pairs in + * 'details'. + * + * A '*typep' of "" indicates that QoS is currently disabled on 'netdev'. + * + * The caller initializes 'details' before calling this function. The + * caller takes ownership of the string key-values pairs added to + * 'details'. + * + * The netdev retains ownership of '*typep'. + * + * '*typep' will be one of the types returned by netdev_get_qos_types() for + * 'netdev'. The contents of 'details' should be documented as valid for + * '*typep' in the "other_config" column in the "QoS" table in + * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)). + * + * May be NULL if 'netdev' does not support QoS at all. */ + int (*get_qos)(const struct netdev *netdev, + const char **typep, struct smap *details); + + /* Attempts to reconfigure QoS on 'netdev', changing the form of QoS to + * 'type' with details of configuration from 'details'. + * + * On error, the previous QoS configuration is retained. + * + * When this function changes the type of QoS (not just 'details'), this + * also resets all queue configuration for 'netdev' to their defaults + * (which depend on the specific type of QoS). Otherwise, the queue + * configuration for 'netdev' is unchanged. + * + * 'type' should be "" (to disable QoS) or one of the types returned by + * netdev_get_qos_types() for 'netdev'. The contents of 'details' should + * be documented as valid for the given 'type' in the "other_config" column + * in the "QoS" table in vswitchd/vswitch.xml (which is built as + * ovs-vswitchd.conf.db(8)). + * + * May be NULL if 'netdev' does not support QoS at all. */ + int (*set_qos)(struct netdev *netdev, + const char *type, const struct smap *details); + + /* Queries 'netdev' for information about the queue numbered 'queue_id'. + * If successful, adds that information as string key-value pairs to + * 'details'. Returns 0 if successful, otherwise a positive errno value. + * + * Should return EINVAL if 'queue_id' is greater than or equal to the + * number of supported queues (as reported in the 'n_queues' member of + * struct netdev_qos_capabilities by 'get_qos_capabilities'). + * + * The caller initializes 'details' before calling this function. The + * caller takes ownership of the string key-values pairs added to + * 'details'. + * + * The returned contents of 'details' should be documented as valid for the + * given 'type' in the "other_config" column in the "Queue" table in + * vswitchd/vswitch.xml (which is built as ovs-vswitchd.conf.db(8)). + */ + int (*get_queue)(const struct netdev *netdev, + unsigned int queue_id, struct smap *details); + + /* Configures the queue numbered 'queue_id' on 'netdev' with the key-value + * string pairs in 'details'. The contents of 'details' should be + * documented as valid for the given 'type' in the "other_config" column in + * the "Queue" table in vswitchd/vswitch.xml (which is built as + * ovs-vswitchd.conf.db(8)). Returns 0 if successful, otherwise a positive + * errno value. On failure, the given queue's configuration should be + * unmodified. + * + * Should return EINVAL if 'queue_id' is greater than or equal to the + * number of supported queues (as reported in the 'n_queues' member of + * struct netdev_qos_capabilities by 'get_qos_capabilities'), or if + * 'details' is invalid for the type of queue. + * + * This function does not modify 'details', and the caller retains + * ownership of it. + * + * May be NULL if 'netdev' does not support QoS at all. */ + int (*set_queue)(struct netdev *netdev, + unsigned int queue_id, const struct smap *details); + + /* Attempts to delete the queue numbered 'queue_id' from 'netdev'. + * + * Should return EINVAL if 'queue_id' is greater than or equal to the + * number of supported queues (as reported in the 'n_queues' member of + * struct netdev_qos_capabilities by 'get_qos_capabilities'). Should + * return EOPNOTSUPP if 'queue_id' is valid but may not be deleted (e.g. if + * 'netdev' has a fixed set of queues with the current QoS mode). + * + * May be NULL if 'netdev' does not support QoS at all, or if all of its + * QoS modes have fixed sets of queues. */ + int (*delete_queue)(struct netdev *netdev, unsigned int queue_id); + + /* Obtains statistics about 'queue_id' on 'netdev'. Fills 'stats' with the + * queue's statistics. May set individual members of 'stats' to all-1-bits + * if the statistic is unavailable. + * + * May be NULL if 'netdev' does not support QoS at all. */ + int (*get_queue_stats)(const struct netdev *netdev, unsigned int queue_id, + struct netdev_queue_stats *stats); + + /* Iterates over all of 'netdev''s queues, calling 'cb' with the queue's + * ID, its configuration, and the 'aux' specified by the caller. The order + * of iteration is unspecified, but (when successful) each queue is visited + * exactly once. + * + * 'cb' will not modify or free the 'details' argument passed in. It may + * delete or modify the queue passed in as its 'queue_id' argument. It may + * modify but will not delete any other queue within 'netdev'. If 'cb' + * adds new queues, then ->dump_queues is allowed to visit some queues + * twice or not at all. + */ + int (*dump_queues)(const struct netdev *netdev, + void (*cb)(unsigned int queue_id, + const struct smap *details, + void *aux), + void *aux); + + /* Iterates over all of 'netdev''s queues, calling 'cb' with the queue's + * ID, its statistics, and the 'aux' specified by the caller. The order of + * iteration is unspecified, but (when successful) each queue must be + * visited exactly once. + * + * 'cb' will not modify or free the statistics passed in. */ + int (*dump_queue_stats)(const struct netdev *netdev, + void (*cb)(unsigned int queue_id, + struct netdev_queue_stats *, + void *aux), + void *aux); + /* If 'netdev' has an assigned IPv4 address, sets '*address' to that * address and '*netmask' to the associated netmask. * @@ -227,7 +516,8 @@ 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. * @@ -259,6 +549,19 @@ struct netdev_class { int (*get_next_hop)(const struct in_addr *host, struct in_addr *next_hop, char **netdev_name); + /* Retrieves driver information of the device. + * + * Populates 'smap' with key-value pairs representing the status of the + * device. 'smap' is a set of key-value string pairs representing netdev + * type specific information. For more information see + * ovs-vswitchd.conf.db(5). + * + * The caller is responsible for destroying 'smap' and its data. + * + * This function may be set to null if it would always return EOPNOTSUPP + * anyhow. */ + int (*get_status)(const struct netdev *netdev, struct smap *smap); + /* Looks up the ARP table entry for 'ip' on 'netdev' and stores the * corresponding MAC address in 'mac'. A return value of ENXIO, in * particular, indicates that there is no ARP table entry for 'ip' on @@ -266,32 +569,47 @@ 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, ovs_be32 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). */ int (*update_flags)(struct netdev *netdev, enum netdev_flags off, enum netdev_flags on, enum netdev_flags *old_flags); - /* Arranges for 'cb' to be called whenever one of the attributes of - * 'netdev' changes and sets '*notifierp' to a newly created - * netdev_notifier that represents this arrangement. The created notifier - * 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, - struct netdev_notifier **notifierp); - - /* Cancels poll notification for 'notifier'. */ - void (*poll_remove)(struct netdev_notifier *notifier); + /* Returns a sequence number which indicates changes in one of 'netdev''s + * properties. The returned sequence number must be nonzero so that + * callers have a value which they may use as a reset when tracking + * 'netdev'. + * + * Minimally, the returned sequence number is required to change whenever + * 'netdev''s flags, features, ethernet address, or carrier changes. The + * returned sequence number is allowed to change even when 'netdev' doesn't + * change, although implementations should try to avoid this. */ + unsigned int (*change_seq)(const struct netdev *netdev); }; +int netdev_register_provider(const struct netdev_class *); +int netdev_unregister_provider(const char *type); +const struct netdev_class *netdev_lookup_provider(const char *type); + extern const struct netdev_class netdev_linux_class; +extern const struct netdev_class netdev_internal_class; extern const struct netdev_class netdev_tap_class; +#ifdef __FreeBSD__ +extern const struct netdev_class netdev_bsd_class; +#endif + +extern const struct netdev_class netdev_tunnel_class; +extern const struct netdev_class netdev_pltap_class; + +#ifdef __cplusplus +} +#endif #endif /* netdev.h */