X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=lib%2Fdpif-provider.h;h=703fd0d92fd068b8957af052131bc929690ff710;hb=HEAD;hp=5ef4c991e4dfc736e8fd101964157d8d867aef14;hpb=89625d1efb32461071837b5e81c1238b4ca63387;p=sliver-openvswitch.git diff --git a/lib/dpif-provider.h b/lib/dpif-provider.h index 5ef4c991e..703fd0d92 100644 --- a/lib/dpif-provider.h +++ b/lib/dpif-provider.h @@ -1,5 +1,5 @@ /* - * Copyright (c) 2009, 2010, 2011 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. @@ -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" @@ -49,7 +48,7 @@ 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); } /* Datapath interface class structure, to be defined by each implementation of @@ -80,6 +79,17 @@ struct dpif_class { * case this function may be a null pointer. */ int (*enumerate)(struct sset *all_dps); + /* 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. * @@ -110,31 +120,46 @@ struct dpif_class { /* Retrieves statistics for 'dpif' into 'stats'. */ int (*get_stats)(const struct dpif *dpif, struct dpif_dp_stats *stats); - /* Adds 'netdev' as a new port in 'dpif'. If successful, sets '*port_no' - * to the new port's port number. */ + /* 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, - uint16_t *port_no); + 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. + /* 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. * - * 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, uint16_t port_no, + * 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 dpif_port *port); - /* Returns one greater than the largest port number accepted in flow - * actions. */ - int (*get_max_ports)(const struct dpif *dpif); - /* 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'. + * 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 @@ -142,7 +167,8 @@ struct dpif_class { * * 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, uint16_t port_no); + 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 @@ -235,59 +261,95 @@ struct dpif_class { /* Deletes a flow from 'dpif' and returns 0, or returns ENOENT if 'dpif' * does not contain such a flow. The flow is specified by the Netlink - * attributes with types OVS_KEY_ATTR_* in the 'key_len' bytes starting at - * 'key'. + * attributes with types OVS_KEY_ATTR_* in the 'del->key_len' bytes + * starting at 'del->key'. * - * If the operation succeeds, then 'stats', if nonnull, must be set to the - * flow's statistics before its deletion. */ - int (*flow_del)(struct dpif *dpif, - const struct nlattr *key, size_t key_len, - struct dpif_flow_stats *stats); + * If the operation succeeds, then 'del->stats', if nonnull, must be set to + * the flow's statistics before its deletion. */ + int (*flow_del)(struct dpif *dpif, const struct dpif_flow_del *del); /* Deletes all flows from 'dpif' and clears all of its queues of received * packets. */ int (*flow_flush)(struct dpif *dpif); + /* Allocates thread-local state for use with the function 'flow_dump_next'. + * On return, initializes '*statep' with any private data needed for + * iteration. */ + void (*flow_dump_state_init)(void **statep); + /* Attempts to begin dumping the flows in a dpif. On success, returns 0 - * and initializes '*statep' with any data needed for iteration. On - * failure, returns a positive errno value. */ - int (*flow_dump_start)(const struct dpif *dpif, void **statep); - - /* Attempts to retrieve another flow from 'dpif' for 'state', which was - * initialized by a successful call to the 'flow_dump_start' function for - * 'dpif'. On success, updates the output parameters as described below - * and returns 0. Returns EOF if the end of the flow table has been - * reached, or a positive errno value on error. This function will not be - * called again once it returns nonzero within a given iteration (but the - * 'flow_dump_done' function will be called afterward). - * - * On success, if 'key' and 'key_len' are nonnull then '*key' and - * '*key_len' must be set to Netlink attributes with types OVS_KEY_ATTR_* - * representing the dumped flow's key. If 'actions' and 'actions_len' are - * nonnull then they should be set to Netlink attributes with types - * OVS_ACTION_ATTR_* representing the dumped flow's actions. If 'stats' - * is nonnull then it should be set to the dumped flow's statistics. + * and initializes '*iterp' with any shared data needed for iteration. + * On failure, returns a positive errno value. */ + int (*flow_dump_start)(const struct dpif *dpif, void **iterp); + + /* Attempts to retrieve another flow from 'dpif' for 'iter', using + * 'state' for storage. 'iter' must have been initialized by a successful + * call to the 'flow_dump_start' function for 'dpif'. 'state' must have + * been initialised with a call to the 'flow_dump_state_init' function for + * 'dpif. + * + * On success, updates the output parameters as described below and returns + * 0. Returns EOF if the end of the flow table has been reached, or a + * positive errno value on error. Multiple threads may use the same 'dpif' + * and 'iter' with this function, but all other parameters must be + * different for each thread. If this function returns non-zero, + * subsequent calls with the same arguments will also return non-zero. + * + * On success: + * + * - If 'key' and 'key_len' are nonnull, then '*key' and '*key_len' + * must be set to Netlink attributes with types OVS_KEY_ATTR_* + * representing the dumped flow's key. + * + * - If 'mask' and 'mask_len' are nonnull then '*mask' and '*mask_len' + * must be set to Netlink attributes with types of OVS_KEY_ATTR_* + * representing the dumped flow's mask. + * + * - If 'actions' and 'actions_len' are nonnull then they should be set + * to Netlink attributes with types OVS_ACTION_ATTR_* representing + * the dumped flow's actions. + * + * - If 'stats' is nonnull then it should be set to the dumped flow's + * statistics. * * All of the returned data is owned by 'dpif', not by the caller, and the * caller must not modify or free it. 'dpif' must guarantee that it * remains accessible and unchanging until at least the next call to - * 'flow_dump_next' or 'flow_dump_done' for 'state'. */ - int (*flow_dump_next)(const struct dpif *dpif, void *state, + * 'flow_dump_next' or 'flow_dump_done' for 'iter' and 'state'. */ + int (*flow_dump_next)(const struct dpif *dpif, void *iter, void *state, const struct nlattr **key, size_t *key_len, + const struct nlattr **mask, size_t *mask_len, const struct nlattr **actions, size_t *actions_len, const struct dpif_flow_stats **stats); - /* Releases resources from 'dpif' for 'state', which was initialized by a - * successful call to the 'flow_dump_start' function for 'dpif'. */ - int (*flow_dump_done)(const struct dpif *dpif, void *state); + /* Determines whether the next call to 'flow_dump_next' with 'state' will + * modify or free the keys that it previously returned. 'state' must have + * been initialized by a call to 'flow_dump_state_init' for 'dpif'. + * + * 'dpif' guarantees that data returned by flow_dump_next() will remain + * accessible and unchanging until the next call. This function provides a + * way for callers to determine whether that guarantee extends beyond the + * next call. + * + * Returns true if the next call to flow_dump_next() is expected to be + * destructive to previously returned keys for 'state', false otherwise. */ + bool (*flow_dump_next_may_destroy_keys)(void *state); + + /* Releases resources from 'dpif' for 'iter', which was initialized by a + * successful call to the 'flow_dump_start' function for 'dpif'. Callers + * must ensure that this function is called once within a given iteration, + * as the final flow dump operation. */ + int (*flow_dump_done)(const struct dpif *dpif, void *iter); + + /* Releases 'state' which was initialized by a call to the + * 'flow_dump_state_init' function for this 'dpif'. */ + void (*flow_dump_state_uninit)(void *statep); /* Performs the 'execute->actions_len' bytes of actions in - * 'execute->actions' on the Ethernet frame specified in 'execute->packet' - * taken from the flow specified in the 'execute->key_len' bytes of - * 'execute->key'. ('execute->key' is mostly redundant with - * 'execute->packet', but it contains some metadata that cannot be - * recovered from 'execute->packet', such as tun_id and in_port.) */ - int (*execute)(struct dpif *dpif, const struct dpif_execute *execute); + * 'execute->actions' on the Ethernet frame in 'execute->packet' + * and on the packet metadata in 'execute->md'. + * May modify both packet and metadata. */ + int (*execute)(struct dpif *dpif, struct dpif_execute *execute); /* 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 @@ -303,31 +365,62 @@ struct dpif_class { * 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); + /* Translates OpenFlow queue ID 'queue_id' (in host byte order) into a * priority value used for setting packet priority. */ int (*queue_to_priority)(const struct dpif *dpif, uint32_t queue_id, uint32_t *priority); - /* Polls for an upcall from 'dpif'. If successful, stores the upcall into - * '*upcall'. Should only be called if 'recv_set' has been used to enable + /* 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 caller takes ownership of the data that 'upcall' points to. - * 'upcall->key' and 'upcall->actions' (if nonnull) point into data owned - * by 'upcall->packet', so their memory cannot be freed separately. (This - * is hardly a great way to do things but it works out OK for the dpif - * providers that exist so far.) + * 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'. * - * For greatest efficiency, 'upcall->packet' should have at least - * offsetof(struct ofp_packet_in, data) bytes of headroom. + * 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, struct dpif_upcall *upcall); + int (*recv)(struct dpif *dpif, uint32_t handler_id, + struct dpif_upcall *upcall, struct ofpbuf *buf); - /* 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); + /* 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. */ @@ -336,6 +429,7 @@ struct dpif_class { extern const struct dpif_class dpif_linux_class; extern const struct dpif_class dpif_netdev_class; +extern const struct dpif_class dpif_planetlab_class; #ifdef __cplusplus }