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https://github.com/zephyrproject-rtos/zephyr
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d6d1b3a748
In case of callback based event listener, it is easy for the callback to filter on the given interface. But in case of the synchronous call it's not: it would need, after a failed comparison on the interface pointer to loop by itself on the net_mgmt_event_wait() which is a little bit heavy (reinstalling the event listener, with the semaphore and all) and a bit of a burden for the caller itself. Instead, net_mgmt provides a dedicated call net_mgmt_event_wait_on_iface() which does it the right way, so the callback and the related semaphore are destroyed if only the iface matches the one given as parameter (besides the timeout obviously). Change-Id: Iab05c3249586f4f4d0447eea42fdac72b8428f2e Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
268 lines
8.2 KiB
C
268 lines
8.2 KiB
C
/*
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* Copyright (c) 2016 Intel Corporation.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @brief Network Management API public header
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*/
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#ifndef __NET_MGMT_H__
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#define __NET_MGMT_H__
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/**
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* @brief Network Management
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* @defgroup net_mgmt Network Management
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* @{
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*/
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#include <misc/__assert.h>
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#include <net/net_core.h>
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struct net_if;
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/**
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* @brief NET MGMT event mask basics, normalizing parts of bit fields
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*/
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#define NET_MGMT_EVENT_MASK 0x80000000
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#define NET_MGMT_ON_IFACE_MASK 0x40000000
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#define NET_MGMT_LAYER_MASK 0x30000000
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#define NET_MGMT_SYNC_EVENT_MASK 0x08000000
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#define NET_MGMT_LAYER_CODE_MASK 0x07FF0000
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#define NET_MGMT_COMMAND_MASK 0x0000FFFF
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#define NET_MGMT_EVENT_BIT BIT(31)
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#define NET_MGMT_IFACE_BIT BIT(30)
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#define NET_MGMT_SYNC_EVENT_BIT BIT(27)
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#define NET_MGMT_LAYER(_layer) (_layer << 28)
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#define NET_MGMT_LAYER_CODE(_code) (_code << 16)
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#define NET_MGMT_EVENT(mgmt_request) \
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(mgmt_request & NET_MGMT_EVENT_MASK)
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#define NET_MGMT_ON_IFACE(mgmt_request) \
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(mgmt_request & NET_MGMT_ON_IFACE_MASK)
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#define NET_MGMT_EVENT_SYNCHRONOUS(mgmt_request) \
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(mgmt_request & NET_MGMT_SYNC_EVENT_MASK)
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#define NET_MGMT_GET_LAYER(mgmt_request) \
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((mgmt_request & NET_MGMT_LAYER_MASK) >> 28)
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#define NET_MGMT_GET_LAYER_CODE(mgmt_request) \
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((mgmt_request & NET_MGMT_LAYER_CODE_MASK) >> 16)
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#define NET_MGMT_GET_COMMAND(mgmt_request) \
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(mgmt_request & NET_MGMT_COMMAND_MASK)
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/* Useful generic definitions */
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#define NET_MGMT_LAYER_L1 1
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#define NET_MGMT_LAYER_L2 2
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#define NET_MGMT_LAYER_L3 3
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#include <net/net_event.h>
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/**
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* @typedef net_mgmt_request_handler_t
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* @brief Signature which all Net MGMT request handler need to follow
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* @param mgmt_request The exact request value the handler is being called
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* through
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* @param iface A valid pointer on struct net_if if the request is meant
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* to be tight to a network interface. NULL otherwise.
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* @param data A valid pointer on a data understood by the handler.
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* NULL otherwise.
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* @param len Length in byte of the memory pointed by data.
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*/
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typedef int (*net_mgmt_request_handler_t)(uint32_t mgmt_request,
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struct net_if *iface,
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void *data, size_t len);
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#define net_mgmt(_mgmt_request, _iface, _data, _len) \
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net_mgmt_##_mgmt_request(_mgmt_request, _iface, _data, _len)
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#define NET_MGMT_DEFINE_REQUEST_HANDLER(_mgmt_request) \
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extern int net_mgmt_##_mgmt_request(uint32_t mgmt_request, \
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struct net_if *iface, \
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void *data, size_t len)
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#define NET_MGMT_REGISTER_REQUEST_HANDLER(_mgmt_request, _func) \
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FUNC_ALIAS(_func, net_mgmt_##_mgmt_request, int)
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struct net_mgmt_event_callback;
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/**
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* @typedef net_mgmt_event_handler_t
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* @brief Define the user's callback handler function signature
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* @param "struct net_mgmt_event_callback *cb"
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* Original struct net_mgmt_event_callback owning this handler.
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* @param "uint32_t mgmt_event" The network event being notified.
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* @param "struct net_if *iface" A pointer on a struct net_if to which the
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* the event belongs to, if it's an event on an iface. NULL otherwise.
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*/
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typedef void (*net_mgmt_event_handler_t)(struct net_mgmt_event_callback *cb,
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uint32_t mgmt_event,
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struct net_if *iface);
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/**
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* @brief Network Management event callback structure
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* Used to register a callback into the network management event part, in order
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* to let the owner of this struct to get network event notification based on
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* given event mask.
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*/
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struct net_mgmt_event_callback {
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/** Meant to be used internally, to insert the callback into a list.
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* So nobody should mess with it.
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*/
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sys_snode_t node;
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union {
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/** Actual callback function being used to notify the owner
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*/
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net_mgmt_event_handler_t handler;
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/** Semaphore meant to be used internaly for the synchronous
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* net_mgmt_event_wait() function.
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*/
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struct k_sem *sync_call;
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};
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/** A mask of network events on which the above handler should be
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* called in case those events come. Such mask can be modified
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* whenever necessary by the owner, and thus will affect the handler
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* being called or not.
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*/
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union {
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/** A mask of network events on which the above handler should
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* be called in case those events come. Such mask can be
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* modified whenever necessary by the owner, and thus will
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* affect the handler being called or not.
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*/
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uint32_t event_mask;
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/** Internal place holder when a synchronous event wait is
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* successfully unlocked on a event.
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*/
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uint32_t raised_event;
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};
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};
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#ifdef CONFIG_NET_MGMT_EVENT
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/**
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* @brief Helper to initialize a struct net_mgmt_event_callback properly
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* @param cb A valid application's callback structure pointer.
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* @param handler A valid handler function pointer.
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* @param mgmt_event_mask A mask of relevant events for the handler
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*/
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static inline
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void net_mgmt_init_event_callback(struct net_mgmt_event_callback *cb,
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net_mgmt_event_handler_t handler,
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uint32_t mgmt_event_mask)
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{
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__ASSERT(cb, "Callback pointer should not be NULL");
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__ASSERT(handler, "Handler pointer should not be NULL");
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cb->handler = handler;
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cb->event_mask = mgmt_event_mask;
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};
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/**
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* @brief Add a user callback
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* @param cb A valid pointer on user's callback to add.
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*/
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void net_mgmt_add_event_callback(struct net_mgmt_event_callback *cb);
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/**
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* @brief Delete a user callback
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* @param cb A valid pointer on user's callback to delete.
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*/
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void net_mgmt_del_event_callback(struct net_mgmt_event_callback *cb);
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/**
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* @brief Used by the system to notify an event.
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* @param mgmt_event The actual network event code to notify
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* @param iface a valid pointer on a struct net_if if only the event is
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* based on an iface. NULL otherwise.
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*/
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void net_mgmt_event_notify(uint32_t mgmt_event, struct net_if *iface);
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/**
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* @brief Used to wait synchronously on an event mask
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* @param mgmt_event_mask A mask of relevant events to wait on.
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* @param raised_event a pointer on a uint32_t to get which event from
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* the mask generated the event. Can be NULL if the caller is not
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* interested in that information.
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* @param iface a pointer on a place holder for the iface on which the
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* event has originated from. This is valid if only the event mask
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* has bit NET_MGMT_IFACE_BIT set relevantly, depending on events
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* the caller wants to listen to.
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* @param timeout a delay in milliseconds. K_FOREVER can be used to wait
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* undefinitely.
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*
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* @return 0 on success, a negative error code otherwise. -ETIMEDOUT will
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* be specifically returned if the timeout kick-in instead of an
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* actual event.
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*/
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int net_mgmt_event_wait(uint32_t mgmt_event_mask,
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uint32_t *raised_event,
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struct net_if **iface,
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int timeout);
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/**
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* @brief Used to wait synchronously on an event mask for a specific iface
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* @param iface a pointer on a valid network interface to listen event to
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* @param mgmt_event_mask A mask of relevant events to wait on. Listened
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* to events should be relevant to iface events and thus have the bit
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* NET_MGMT_IFACE_BIT set.
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* @param raised_event a pointer on a uint32_t to get which event from
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* the mask generated the event. Can be NULL if the caller is not
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* interested in that information.
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* @param timeout a delay in milliseconds. K_FOREVER can be used to wait
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* undefinitely.
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*
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* @return 0 on success, a negative error code otherwise. -ETIMEDOUT will
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* be specifically returned if the timeout kick-in instead of an
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* actual event.
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*/
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int net_mgmt_event_wait_on_iface(struct net_if *iface,
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uint32_t mgmt_event_mask,
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uint32_t *raised_event,
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int timeout);
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/**
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* @brief Used by the core of the network stack to initialize the network
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* event processing.
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*/
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void net_mgmt_event_init(void);
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#else
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#define net_mgmt_init_event_callback(...)
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#define net_mgmt_add_event_callback(...)
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#define net_mgmt_event_notify(...)
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#define net_mgmt_event_init(...)
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static inline int net_mgmt_event_wait(uint32_t mgmt_event_mask,
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uint32_t *raised_event,
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struct net_if **iface,
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int timeout)
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{
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return 0;
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}
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static inline int net_mgmt_event_wait_on_iface(struct net_if *iface,
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uint32_t mgmt_event_mask,
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uint32_t *raised_event,
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int timeout)
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{
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return 0;
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}
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#endif /* CONFIG_NET_MGMT_EVENT */
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/**
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* @}
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*/
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#endif /* __NET_MGMT_H__ */
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