cache_manager: Move documentation to doc/core.txt
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Thomas Graf
parent
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2 changed files with 77 additions and 65 deletions
76
doc/core.txt
76
doc/core.txt
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@ -2555,6 +2555,82 @@ to further specify what will be part of the cache.
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All such functions return a newly allocated cache or NULL
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in case of an error.
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=== Cache Manager
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The purpose of a cache manager is to keep track of caches and
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automatically receive event notifications to keep the caches
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up to date with the kernel state. Each manager has exactly one
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netlink socket assigned which limits the scope of each manager
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to exactly one netlink family. Therefore all caches committed
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to a manager must be part of the same netlink family. Due to the
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nature of a manager, it is not possible to have a cache maintain
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two instances of the same cache type. The socket is subscribed
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to the event notification group of each cache and also put into
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non-blocking mode. Functions exist to poll() on the socket to
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wait for new events to be received.
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----
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App libnl Kernel
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| |
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+-----------------+ [ notification, link change ]
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| | Cache Manager | | [ (IFF_UP | IFF_RUNNING) ]
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| | |
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| | +------------+| | | [ notification, new addr ]
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<-------|---| route/link |<-------(async)--+ [ 10.0.1.1/32 dev eth1 ]
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| | +------------+| | |
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| +------------+| |
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<---|---|---| route/addr |<------|-(async)--------------+
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| +------------+|
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| | +------------+| |
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<-------|---| ... ||
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+-----------------+
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----
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.Creating a new cache manager
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[source,c]
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----
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struct nl_cache_mngr *mngr;
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// Allocate a new cache manager for RTNETLINK and automatically
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// provide the caches added to the manager.
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mngr = nl_cache_mngr_alloc(NETLINK_ROUTE, NL_AUTO_PROVIDE);
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----
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.Keep track of a cache
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[source,c]
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----
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struct nl_cache *cache;
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// Create a new cache for links/interfaces and ask the manager to
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// keep it up to date for us. This will trigger a full dump request
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// to initially fill the cache.
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cache = nl_cache_mngr_add(mngr, "route/link");
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-----
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.Make the manager receive updates
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[source,c]
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----
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// Give the manager the ability to receive updates, will call poll()
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// with a timeout of 5 seconds.
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if (nl_cache_mngr_poll(mngr, 5000) > 0) {
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// Manager received at least one update, dump cache?
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nl_cache_dump(cache, ...);
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}
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----
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.Release cache manager
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[source,c]
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----
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nl_cache_mngr_free(mngr);
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----
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== Abstract Data Types
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A few high level abstract data types which are used by a majority netlink
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@ -12,72 +12,8 @@
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/**
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* @ingroup cache_mngt
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* @defgroup cache_mngr Manager
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* @brief Helps keeping caches up to date.
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* @brief Automatically keep caches up to date
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*
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* The purpose of a cache manager is to keep track of caches and
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* automatically receive event notifications to keep the caches
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* up to date with the kernel state. Each manager has exactly one
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* netlink socket assigned which limits the scope of each manager
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* to exactly one netlink family. Therefore all caches committed
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* to a manager must be part of the same netlink family. Due to the
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* nature of a manager, it is not possible to have a cache maintain
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* two instances of the same cache type. The socket is subscribed
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* to the event notification group of each cache and also put into
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* non-blocking mode. Functions exist to poll() on the socket to
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* wait for new events to be received.
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*
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* @code
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* App libnl Kernel
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* | |
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* +-----------------+ [ notification, link change ]
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* | | Cache Manager | | [ (IFF_UP | IFF_RUNNING) ]
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* | | |
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* | | +------------+| | | [ notification, new addr ]
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* <-------|---| route/link |<-------(async)--+ [ 10.0.1.1/32 dev eth1 ]
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* | | +------------+| | |
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* | +------------+| |
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* <---|---|---| route/addr |<------|-(async)--------------+
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* | +------------+|
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* | | +------------+| |
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* <-------|---| ... ||
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* | | +------------+| |
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* +-----------------+
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* | |
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* @endcode
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*
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* @par 1) Creating a new cache manager
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* @code
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* struct nl_cache_mngr *mngr;
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*
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* // Allocate a new cache manager for RTNETLINK and automatically
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* // provide the caches added to the manager.
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* mngr = nl_cache_mngr_alloc(NETLINK_ROUTE, NL_AUTO_PROVIDE);
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* @endcode
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*
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* @par 2) Keep track of a cache
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* @code
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* struct nl_cache *cache;
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*
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* // Create a new cache for links/interfaces and ask the manager to
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* // keep it up to date for us. This will trigger a full dump request
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* // to initially fill the cache.
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* cache = nl_cache_mngr_add(mngr, "route/link");
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* @endcode
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*
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* @par 3) Make the manager receive updates
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* @code
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* // Give the manager the ability to receive updates, will call poll()
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* // with a timeout of 5 seconds.
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* if (nl_cache_mngr_poll(mngr, 5000) > 0) {
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* // Manager received at least one update, dump cache?
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* nl_cache_dump(cache, ...);
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* }
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* @endcode
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*
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* @par 4) Release cache manager
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* @code
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* nl_cache_mngr_free(mngr);
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* @endcode
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* @{
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*/
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