X-Git-Url: http://git.cascardo.eti.br/?a=blobdiff_plain;f=lib%2Fdpif-provider.h;h=fbd370fcc05b67dca8388eb19a940d5eb8d11068;hb=HEAD;hp=b2f9d4bd1bfc7c856b799c6a29a3dade628ac821;hpb=aae51f53358dc7946f7f09a88b1e0dd40306a99a;p=cascardo%2Fovs.git diff --git a/lib/dpif-provider.h b/lib/dpif-provider.h index b2f9d4bd1..fbd370fcc 100644 --- a/lib/dpif-provider.h +++ b/lib/dpif-provider.h @@ -1,5 +1,5 @@ /* - * Copyright (c) 2009, 2010 Nicira Networks. + * Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014 Nicira, Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. @@ -22,7 +22,6 @@ * exposed over OpenFlow as a single switch. Datapaths and the collections of * ports that they contain may be fixed or dynamic. */ -#include #include "openflow/openflow.h" #include "dpif.h" #include "util.h" @@ -49,9 +48,34 @@ void dpif_uninit(struct dpif *dpif, bool close); static inline void dpif_assert_class(const struct dpif *dpif, const struct dpif_class *dpif_class) { - assert(dpif->dpif_class == dpif_class); + ovs_assert(dpif->dpif_class == dpif_class); } +struct dpif_flow_dump { + struct dpif *dpif; + bool terse; /* If true, key/mask/actions may be omitted. */ +}; + +static inline void +dpif_flow_dump_init(struct dpif_flow_dump *dump, const struct dpif *dpif) +{ + dump->dpif = CONST_CAST(struct dpif *, dpif); +} + +struct dpif_flow_dump_thread { + struct dpif *dpif; +}; + +static inline void +dpif_flow_dump_thread_init(struct dpif_flow_dump_thread *thread, + struct dpif_flow_dump *dump) +{ + thread->dpif = dump->dpif; +} + +struct ct_dpif_dump_state; +struct ct_dpif_entry; + /* Datapath interface class structure, to be defined by each implementation of * a datapath interface. * @@ -69,95 +93,140 @@ struct dpif_class { * the type assumed if no type is specified when opening a dpif. */ const char *type; - /* Performs periodic work needed by dpifs of this class, if any is - * necessary. */ - void (*run)(void); - - /* Arranges for poll_block() to wake up if the "run" member function needs - * to be called. */ - void (*wait)(void); - - /* Enumerates the names of all known created datapaths, if possible, into - * 'all_dps'. The caller has already initialized 'all_dps' and other dpif - * classes might already have added names to it. + /* Called when the dpif provider is registered, typically at program + * startup. Returning an error from this function will prevent any + * datapath with this class from being created. + * + * This function may be set to null if a datapath class needs no + * initialization at registration time. */ + int (*init)(void); + + /* Enumerates the names of all known created datapaths (of class + * 'dpif_class'), if possible, into 'all_dps'. The caller has already + * initialized 'all_dps' and other dpif classes might already have added + * names to it. * * This is used by the vswitch at startup, so that it can delete any * datapaths that are not configured. * * Some kinds of datapaths might not be practically enumerable, in which * case this function may be a null pointer. */ - int (*enumerate)(struct svec *all_dps); + int (*enumerate)(struct sset *all_dps, const struct dpif_class *dpif_class); + + /* Returns the type to pass to netdev_open() when a dpif of class + * 'dpif_class' has a port of type 'type', for a few special cases + * when a netdev type differs from a port type. For example, when + * using the userspace datapath, a port of type "internal" needs to + * be opened as "tap". + * + * Returns either 'type' itself or a string literal, which must not + * be freed. */ + const char *(*port_open_type)(const struct dpif_class *dpif_class, + const char *type); /* Attempts to open an existing dpif called 'name', if 'create' is false, * or to open an existing dpif or create a new one, if 'create' is true. - * 'type' corresponds to the 'type' field used in the dpif_class - * structure. * - * If successful, stores a pointer to the new dpif in '*dpifp'. On failure - * there are no requirements on what is stored in '*dpifp'. */ - int (*open)(const char *name, const char *type, bool create, - struct dpif **dpifp); + * 'dpif_class' is the class of dpif to open. + * + * If successful, stores a pointer to the new dpif in '*dpifp', which must + * have class 'dpif_class'. On failure there are no requirements on what + * is stored in '*dpifp'. */ + int (*open)(const struct dpif_class *dpif_class, + const char *name, bool create, struct dpif **dpifp); /* Closes 'dpif' and frees associated memory. */ void (*close)(struct dpif *dpif); - /* Enumerates all names that may be used to open 'dpif' into 'all_names'. - * The Linux datapath, for example, supports opening a datapath both by - * number, e.g. "dp0", and by the name of the datapath's local port. For - * some datapaths, this might be an infinite set (e.g. in a file name, - * slashes may be duplicated any number of times), in which case only the - * names most likely to be used should be enumerated. - * - * 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 a datapath class does not support multiple names for a datapath, this - * function may be a null pointer. - * - * This is used by the vswitch at startup, */ - int (*get_all_names)(const struct dpif *dpif, struct svec *all_names); - /* Attempts to destroy the dpif underlying 'dpif'. * * If successful, 'dpif' will not be used again except as an argument for * the 'close' member function. */ int (*destroy)(struct dpif *dpif); - /* Retrieves statistics for 'dpif' into 'stats'. */ - int (*get_stats)(const struct dpif *dpif, struct odp_stats *stats); + /* Performs periodic work needed by 'dpif', if any is necessary. + * Returns true if need to revalidate. */ + bool (*run)(struct dpif *dpif); - /* Retrieves 'dpif''s current treatment of IP fragments into '*drop_frags': - * true indicates that fragments are dropped, false indicates that - * fragments are treated in the same way as other IP packets (except that - * the L4 header cannot be read). */ - int (*get_drop_frags)(const struct dpif *dpif, bool *drop_frags); + /* Arranges for poll_block() to wake up if the "run" member function needs + * to be called for 'dpif'. */ + void (*wait)(struct dpif *dpif); - /* Changes 'dpif''s treatment of IP fragments to 'drop_frags', whose - * meaning is the same as for the get_drop_frags member function. */ - int (*set_drop_frags)(struct dpif *dpif, bool drop_frags); + /* Retrieves statistics for 'dpif' into 'stats'. */ + int (*get_stats)(const struct dpif *dpif, struct dpif_dp_stats *stats); - /* Creates a new port in 'dpif' connected to network device 'devname'. - * 'flags' is a set of ODP_PORT_* flags. If successful, sets '*port_no' - * to the new port's port number. */ - int (*port_add)(struct dpif *dpif, const char *devname, uint16_t flags, - uint16_t *port_no); + /* Adds 'netdev' as a new port in 'dpif'. If '*port_no' is not + * UINT32_MAX, attempts to use that as the port's port number. + * + * If port is successfully added, sets '*port_no' to the new port's + * port number. Returns EBUSY if caller attempted to choose a port + * number, and it was in use. */ + int (*port_add)(struct dpif *dpif, struct netdev *netdev, + odp_port_t *port_no); /* Removes port numbered 'port_no' from 'dpif'. */ - int (*port_del)(struct dpif *dpif, uint16_t port_no); + int (*port_del)(struct dpif *dpif, odp_port_t port_no); - /* Queries 'dpif' for a port with the given 'port_no' or 'devname'. Stores - * information about the port into '*port' if successful. */ - int (*port_query_by_number)(const struct dpif *dpif, uint16_t port_no, - struct odp_port *port); + /* Queries 'dpif' for a port with the given 'port_no' or 'devname'. + * If 'port' is not null, stores information about the port into + * '*port' if successful. + * + * If 'port' is not null, the caller takes ownership of data in + * 'port' and must free it with dpif_port_destroy() when it is no + * longer needed. */ + int (*port_query_by_number)(const struct dpif *dpif, odp_port_t port_no, + struct dpif_port *port); int (*port_query_by_name)(const struct dpif *dpif, const char *devname, - struct odp_port *port); + struct dpif_port *port); + + /* Returns the Netlink PID value to supply in OVS_ACTION_ATTR_USERSPACE + * actions as the OVS_USERSPACE_ATTR_PID attribute's value, for use in + * flows whose packets arrived on port 'port_no'. In the case where the + * provider allocates multiple Netlink PIDs to a single port, it may use + * 'hash' to spread load among them. The caller need not use a particular + * hash function; a 5-tuple hash is suitable. + * + * (The datapath implementation might use some different hash function for + * distributing packets received via flow misses among PIDs. This means + * that packets received via flow misses might be reordered relative to + * packets received via userspace actions. This is not ordinarily a + * problem.) + * + * A 'port_no' of UINT32_MAX should be treated as a special case. The + * implementation should return a reserved PID, not allocated to any port, + * that the client may use for special purposes. + * + * The return value only needs to be meaningful when DPIF_UC_ACTION has + * been enabled in the 'dpif''s listen mask, and it is allowed to change + * when DPIF_UC_ACTION is disabled and then re-enabled. + * + * A dpif provider that doesn't have meaningful Netlink PIDs can use NULL + * for this function. This is equivalent to always returning 0. */ + uint32_t (*port_get_pid)(const struct dpif *dpif, odp_port_t port_no, + uint32_t hash); + + /* Attempts to begin dumping the ports in a dpif. On success, returns 0 + * and initializes '*statep' with any data needed for iteration. On + * failure, returns a positive errno value. */ + int (*port_dump_start)(const struct dpif *dpif, void **statep); + + /* Attempts to retrieve another port from 'dpif' for 'state', which was + * initialized by a successful call to the 'port_dump_start' function for + * 'dpif'. On success, stores a new dpif_port into 'port' and returns 0. + * Returns EOF if the end of the port table has been reached, or a positive + * errno value on error. This function will not be called again once it + * returns nonzero once for a given iteration (but the 'port_dump_done' + * function will be called afterward). + * + * The dpif provider retains ownership of the data stored in 'port'. It + * must remain valid until at least the next call to 'port_dump_next' or + * 'port_dump_done' for 'state'. */ + int (*port_dump_next)(const struct dpif *dpif, void *state, + struct dpif_port *port); - /* Stores in 'ports' information about up to 'n' ports attached to 'dpif', - * in no particular order. Returns the number of ports attached to 'dpif' - * (not the number stored), if successful, otherwise a negative errno - * value. */ - int (*port_list)(const struct dpif *dpif, struct odp_port *ports, int n); + /* Releases resources from 'dpif' for 'state', which was initialized by a + * successful call to the 'port_dump_start' function for 'dpif'. */ + int (*port_dump_done)(const struct dpif *dpif, void *state); /* Polls for changes in the set of ports in 'dpif'. If the set of ports in * 'dpif' has changed, then this function should do one of the @@ -183,156 +252,174 @@ struct dpif_class { * value other than EAGAIN. */ void (*port_poll_wait)(const struct dpif *dpif); - /* Stores in 'ports' the port numbers of up to 'n' ports that belong to - * 'group' in 'dpif'. Returns the number of ports in 'group' (not the - * number stored), if successful, otherwise a negative errno value. */ - int (*port_group_get)(const struct dpif *dpif, int group, - uint16_t ports[], int n); - - /* Changes port group 'group' in 'dpif' to consist of the 'n' ports whose - * numbers are given in 'ports'. - * - * Use the get_stats member function to obtain the number of supported port - * groups. */ - int (*port_group_set)(struct dpif *dpif, int group, - const uint16_t ports[], int n); - - /* For each flow 'flow' in the 'n' flows in 'flows': - * - * - If a flow matching 'flow->key' exists in 'dpif': - * - * Stores 0 into 'flow->stats.error' and stores statistics for the flow - * into 'flow->stats'. - * - * If 'flow->n_actions' is zero, then 'flow->actions' is ignored. If - * 'flow->n_actions' is nonzero, then 'flow->actions' should point to - * an array of the specified number of actions. At most that many of - * the flow's actions will be copied into that array. - * 'flow->n_actions' will be updated to the number of actions actually - * present in the flow, which may be greater than the number stored if - * the flow has more actions than space available in the array. - * - * - Flow-specific errors are indicated by a positive errno value in - * 'flow->stats.error'. In particular, ENOENT indicates that no flow - * matching 'flow->key' exists in 'dpif'. When an error value is stored, - * the contents of 'flow->key' are preserved but other members of 'flow' - * should be treated as indeterminate. - * - * Returns 0 if all 'n' flows in 'flows' were updated (whether they were - * individually successful or not is indicated by 'flow->stats.error', - * however). Returns a positive errno value if an error that prevented - * this update occurred, in which the caller must not depend on any - * elements in 'flows' being updated or not updated. - */ - int (*flow_get)(const struct dpif *dpif, struct odp_flow flows[], int n); - - /* Adds or modifies a flow in 'dpif' as specified in 'put': - * - * - If the flow specified in 'put->flow' does not exist in 'dpif', then - * behavior depends on whether ODPPF_CREATE is specified in 'put->flags': - * if it is, the flow will be added, otherwise the operation will fail - * with ENOENT. - * - * - Otherwise, the flow specified in 'put->flow' does exist in 'dpif'. - * Behavior in this case depends on whether ODPPF_MODIFY is specified in - * 'put->flags': if it is, the flow's actions will be updated, otherwise - * the operation will fail with EEXIST. If the flow's actions are - * updated, then its statistics will be zeroed if ODPPF_ZERO_STATS is set - * in 'put->flags', left as-is otherwise. - */ - int (*flow_put)(struct dpif *dpif, struct odp_flow_put *put); - - /* Deletes a flow matching 'flow->key' from 'dpif' or returns ENOENT if - * 'dpif' does not contain such a flow. - * - * If successful, updates 'flow->stats', 'flow->n_actions', and - * 'flow->actions' as described in more detail under the flow_get member - * function below. */ - int (*flow_del)(struct dpif *dpif, struct odp_flow *flow); - /* Deletes all flows from 'dpif' and clears all of its queues of received * packets. */ int (*flow_flush)(struct dpif *dpif); - /* Stores up to 'n' flows in 'dpif' into 'flows', updating their statistics - * and actions as described under the flow_get member function. If - * successful, returns the number of flows actually present in 'dpif', - * which might be greater than the number stored (if 'dpif' has more than - * 'n' flows). On failure, returns a negative errno value. */ - int (*flow_list)(const struct dpif *dpif, struct odp_flow flows[], int n); - - /* Performs the 'n_actions' actions in 'actions' on the Ethernet frame - * specified in 'packet'. - * - * Pretends that the frame was originally received on the port numbered - * 'in_port'. This affects only ODPAT_OUTPUT_GROUP actions, which will not - * send a packet out their input port. Specify the number of an unused - * port (e.g. UINT16_MAX is currently always unused) to avoid this - * behavior. */ - int (*execute)(struct dpif *dpif, uint16_t in_port, - const union odp_action actions[], int n_actions, - const struct ofpbuf *packet); - - /* Retrieves 'dpif''s "listen mask" into '*listen_mask'. Each ODPL_* bit - * set in '*listen_mask' indicates the 'dpif' will receive messages of the - * corresponding type when it calls the recv member function. */ - int (*recv_get_mask)(const struct dpif *dpif, int *listen_mask); - - /* Sets 'dpif''s "listen mask" to 'listen_mask'. Each ODPL_* bit set in - * 'listen_mask' indicates the 'dpif' will receive messages of the - * corresponding type when it calls the recv member function. */ - int (*recv_set_mask)(struct dpif *dpif, int listen_mask); - - /* Retrieves 'dpif''s sFlow sampling probability into '*probability'. - * Return value is 0 or a positive errno value. EOPNOTSUPP indicates that - * the datapath does not support sFlow, as does a null pointer. - * - * '*probability' is expressed as the number of packets out of UINT_MAX to - * sample, e.g. probability/UINT_MAX is the probability of sampling a given - * packet. */ - int (*get_sflow_probability)(const struct dpif *dpif, - uint32_t *probability); - - /* Sets 'dpif''s sFlow sampling probability to 'probability'. Return value - * is 0 or a positive errno value. EOPNOTSUPP indicates that the datapath - * does not support sFlow, as does a null pointer. - * - * 'probability' is expressed as the number of packets out of UINT_MAX to - * sample, e.g. probability/UINT_MAX is the probability of sampling a given - * packet. */ - int (*set_sflow_probability)(struct dpif *dpif, uint32_t probability); + /* Flow dumping interface. + * + * This is the back-end for the flow dumping interface described in + * dpif.h. Please read the comments there first, because this code + * closely follows it. + * + * 'flow_dump_create' and 'flow_dump_thread_create' must always return an + * initialized and usable data structure and defer error return until + * flow_dump_destroy(). This hasn't been a problem for the dpifs that + * exist so far. + * + * 'flow_dump_create' and 'flow_dump_thread_create' must initialize the + * structures that they return with dpif_flow_dump_init() and + * dpif_flow_dump_thread_init(), respectively. + * + * If 'terse' is true, then only UID and statistics will + * be returned in the dump. Otherwise, all fields will be returned. */ + struct dpif_flow_dump *(*flow_dump_create)(const struct dpif *dpif, + bool terse); + int (*flow_dump_destroy)(struct dpif_flow_dump *dump); + + struct dpif_flow_dump_thread *(*flow_dump_thread_create)( + struct dpif_flow_dump *dump); + void (*flow_dump_thread_destroy)(struct dpif_flow_dump_thread *thread); + + int (*flow_dump_next)(struct dpif_flow_dump_thread *thread, + struct dpif_flow *flows, int max_flows); + + /* Executes each of the 'n_ops' operations in 'ops' on 'dpif', in the order + * in which they are specified, placing each operation's results in the + * "output" members documented in comments and the 'error' member of each + * dpif_op. */ + void (*operate)(struct dpif *dpif, struct dpif_op **ops, size_t n_ops); + + /* Enables or disables receiving packets with dpif_recv() for 'dpif'. + * Turning packet receive off and then back on is allowed to change Netlink + * PID assignments (see ->port_get_pid()). The client is responsible for + * updating flows as necessary if it does this. */ + int (*recv_set)(struct dpif *dpif, bool enable); + + /* Refreshes the poll loops and Netlink sockets associated to each port, + * when the number of upcall handlers (upcall receiving thread) is changed + * to 'n_handlers' and receiving packets for 'dpif' is enabled by + * recv_set(). + * + * Since multiple upcall handlers can read upcalls simultaneously from + * 'dpif', each port can have multiple Netlink sockets, one per upcall + * handler. So, handlers_set() is responsible for the following tasks: + * + * When receiving upcall is enabled, extends or creates the + * configuration to support: + * + * - 'n_handlers' Netlink sockets for each port. + * + * - 'n_handlers' poll loops, one for each upcall handler. + * + * - registering the Netlink sockets for the same upcall handler to + * the corresponding poll loop. + * */ + int (*handlers_set)(struct dpif *dpif, uint32_t n_handlers); + + /* If 'dpif' creates its own I/O polling threads, refreshes poll threads + * configuration. 'cmask' configures the cpu mask for setting the polling + * threads' cpu affinity. */ + int (*poll_threads_set)(struct dpif *dpif, const char *cmask); /* Translates OpenFlow queue ID 'queue_id' (in host byte order) into a - * priority value for use in the ODPAT_SET_PRIORITY action in - * '*priority'. */ + * priority value used for setting packet priority. */ int (*queue_to_priority)(const struct dpif *dpif, uint32_t queue_id, uint32_t *priority); - /* Attempts to receive a message from 'dpif'. If successful, stores the - * message into '*packetp'. The message, if one is received, must begin - * with 'struct odp_msg' as a header, and must have at least - * DPIF_RECV_MSG_PADDING bytes of headroom (allocated using - * e.g. ofpbuf_reserve()). Only messages of the types selected with the - * set_listen_mask member function should be received. + /* Polls for an upcall from 'dpif' for an upcall handler. Since there + * can be multiple poll loops (see ->handlers_set()), 'handler_id' is + * needed as index to identify the corresponding poll loop. If + * successful, stores the upcall into '*upcall', using 'buf' for + * storage. Should only be called if 'recv_set' has been used to enable + * receiving packets from 'dpif'. + * + * The implementation should point 'upcall->key' and 'upcall->userdata' + * (if any) into data in the caller-provided 'buf'. The implementation may + * also use 'buf' for storing the data of 'upcall->packet'. If necessary + * to make room, the implementation may reallocate the data in 'buf'. + * + * The caller owns the data of 'upcall->packet' and may modify it. If + * packet's headroom is exhausted as it is manipulated, 'upcall->packet' + * will be reallocated. This requires the data of 'upcall->packet' to be + * released with ofpbuf_uninit() before 'upcall' is destroyed. However, + * when an error is returned, the 'upcall->packet' may be uninitialized + * and should not be released. + * + * This function must not block. If no upcall is pending when it is + * called, it should return EAGAIN without blocking. */ + int (*recv)(struct dpif *dpif, uint32_t handler_id, + struct dpif_upcall *upcall, struct ofpbuf *buf); + + /* Arranges for the poll loop for an upcall handler to wake up when 'dpif' + * has a message queued to be received with the recv member functions. + * Since there can be multiple poll loops (see ->handlers_set()), + * 'handler_id' is needed as index to identify the corresponding poll loop. + * */ + void (*recv_wait)(struct dpif *dpif, uint32_t handler_id); + + /* Throws away any queued upcalls that 'dpif' currently has ready to + * return. */ + void (*recv_purge)(struct dpif *dpif); + + /* When 'dpif' is about to purge the datapath, the higher layer may want + * to be notified so that it could try reacting accordingly (e.g. grabbing + * all flow stats before they are gone). * - * This function must not block. If no message is ready to be received - * when it is called, it should return EAGAIN without blocking. */ - int (*recv)(struct dpif *dpif, struct ofpbuf **packetp); + * Registers an upcall callback function with 'dpif'. This is only used + * if 'dpif' needs to notify the purging of datapath. 'aux' is passed to + * the callback on invocation. */ + void (*register_dp_purge_cb)(struct dpif *, dp_purge_callback *, void *aux); + + /* For datapaths that run in userspace (i.e. dpif-netdev), threads polling + * for incoming packets can directly call upcall functions instead of + * offloading packet processing to separate handler threads. Datapaths + * that directly call upcall functions should use the functions below to + * to register an upcall function and enable / disable upcalls. + * + * Registers an upcall callback function with 'dpif'. This is only used + * if 'dpif' directly executes upcall functions. 'aux' is passed to the + * callback on invocation. */ + void (*register_upcall_cb)(struct dpif *, upcall_callback *, void *aux); - /* Arranges for the poll loop to wake up when 'dpif' has a message queued - * to be received with the recv member function. */ - void (*recv_wait)(struct dpif *dpif); -}; + /* Enables upcalls if 'dpif' directly executes upcall functions. */ + void (*enable_upcall)(struct dpif *); + + /* Disables upcalls if 'dpif' directly executes upcall functions. */ + void (*disable_upcall)(struct dpif *); -/* Minimum number of bytes of headroom for a packet returned by the 'recv' - * member function (see above). This headroom allows "struct odp_msg" to be - * replaced by "struct ofp_packet_in" without copying the buffer. */ -#define DPIF_RECV_MSG_PADDING (sizeof(struct ofp_packet_in) \ - - sizeof(struct odp_msg)) -BUILD_ASSERT_DECL(sizeof(struct ofp_packet_in) > sizeof(struct odp_msg)); -BUILD_ASSERT_DECL(DPIF_RECV_MSG_PADDING % 4 == 0); + /* Get datapath version. Caller is responsible for freeing the string + * returned. */ + char *(*get_datapath_version)(void); + + /* Conntrack entry dumping interface. + * + * These functions are used by ct-dpif.c to provide a datapath-agnostic + * dumping interface to the connection trackes provided by the + * datapaths. + * + * ct_dump_start() should put in '*state' a pointer to a newly allocated + * stucture that will be passed by the caller to ct_dump_next() and + * ct_dump_done(). If 'zone' is not NULL, only the entries in '*zone' + * should be dumped. + * + * ct_dump_next() should fill 'entry' with information from a connection + * and prepare to dump the next one on a subsequest invocation. + * + * ct_dump_done should perform any cleanup necessary (including + * deallocating the 'state' structure, if applicable). */ + int (*ct_dump_start)(struct dpif *, struct ct_dpif_dump_state **state, + const uint16_t *zone); + int (*ct_dump_next)(struct dpif *, struct ct_dpif_dump_state *, + struct ct_dpif_entry *entry); + int (*ct_dump_done)(struct dpif *, struct ct_dpif_dump_state *state); + + /* Flushes the connection tracking tables. If 'zone' is not NULL, + * only deletes connections in '*zone'. */ + int (*ct_flush)(struct dpif *, const uint16_t *zone); +}; -extern const struct dpif_class dpif_linux_class; +extern const struct dpif_class dpif_netlink_class; extern const struct dpif_class dpif_netdev_class; #ifdef __cplusplus