common vpp api C declarations More...

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Typedefs
typedef struct vapi_ctx_s *	vapi_ctx_t

typedef vapi_error_e(*	vapi_event_cb) (vapi_ctx_t ctx, void callback_ctx, void payload)
	generic vapi event callback More...

typedef vapi_error_e(*	vapi_generic_event_cb) (vapi_ctx_t ctx, void callback_ctx, vapi_msg_id_t id, void msg)
	generic vapi event callback More...

Functions
void *	vapi_msg_alloc (vapi_ctx_t ctx, size_t size)
	allocate vapi message of given size More...

void	vapi_msg_free (vapi_ctx_t ctx, void *msg)
	free a vapi message More...

vapi_error_e	vapi_ctx_alloc (vapi_ctx_t *result)
	allocate vapi context More...

void	vapi_ctx_free (vapi_ctx_t ctx)
	free vapi context More...

bool	vapi_is_msg_available (vapi_ctx_t ctx, vapi_msg_id_t type)
	check if message identified by it's message id is known by the vpp to which the connection is open More...

vapi_error_e	vapi_connect (vapi_ctx_t ctx, const char name, const char chroot_prefix, int max_outstanding_requests, int response_queue_size, vapi_mode_e mode, bool handle_keepalives)
	connect to vpp More...

vapi_error_e	vapi_disconnect (vapi_ctx_t ctx)
	disconnect from vpp More...

vapi_error_e	vapi_get_fd (vapi_ctx_t ctx, int *fd)
	get event file descriptor More...

vapi_error_e	vapi_send (vapi_ctx_t ctx, void *msg)
	low-level api for sending messages to vpp More...

vapi_error_e	vapi_send2 (vapi_ctx_t ctx, void msg1, void msg2)
	low-level api for atomically sending two messages to vpp - either both messages are sent or neither one is More...

vapi_error_e	vapi_recv (vapi_ctx_t ctx, void *msg, size_t msg_size, svm_q_conditional_wait_t cond, u32 time)
	low-level api for reading messages from vpp More...

vapi_error_e	vapi_wait (vapi_ctx_t ctx, vapi_wait_mode_e mode)
	wait for connection to become readable or writable More...

vapi_error_e	vapi_dispatch_one (vapi_ctx_t ctx)
	pick next message sent by vpp and call the appropriate callback More...

vapi_error_e	vapi_dispatch (vapi_ctx_t ctx)
	loop vapi_dispatch_one until responses to all currently outstanding requests have been received and their callbacks called More...

void	vapi_set_event_cb (vapi_ctx_t ctx, vapi_msg_id_t id, vapi_event_cb callback, void *callback_ctx)
	set event callback to call when message with given id is dispatched More...

void	vapi_clear_event_cb (vapi_ctx_t ctx, vapi_msg_id_t id)
	clear event callback for given message id More...

void	vapi_set_generic_event_cb (vapi_ctx_t ctx, vapi_generic_event_cb callback, void *callback_ctx)
	set generic event callback More...

void	vapi_clear_generic_event_cb (vapi_ctx_t ctx)
	clear generic event callback More...

Detailed Description

common vpp api C declarations

This file declares the common C API functions. These include connect, disconnect and utility functions as well as the low-level vapi_send and vapi_recv API. This is only the transport layer.

Message formats and higher-level APIs are generated by running the vapi_c_gen.py script (which is run for in-tree APIs as part of the build process). It's not recommended to mix the higher and lower level APIs. Due to version issues, the higher-level APIs are not part of the shared library.

Definition in file vapi.h.

Typedef Documentation

◆ vapi_ctx_t

typedef struct vapi_ctx_s* vapi_ctx_t

Definition at line 47 of file vapi.h.

◆ vapi_event_cb

typedef vapi_error_e(* vapi_event_cb) (vapi_ctx_t ctx, void *callback_ctx, void *payload)

generic vapi event callback

Definition at line 211 of file vapi.h.

◆ vapi_generic_event_cb

typedef vapi_error_e(* vapi_generic_event_cb) (vapi_ctx_t ctx, void *callback_ctx, vapi_msg_id_t id, void *msg)

generic vapi event callback

Definition at line 234 of file vapi.h.

Function Documentation

◆ vapi_clear_event_cb()

void vapi_clear_event_cb	(	vapi_ctx_t	ctx,
		vapi_msg_id_t	id
	)

clear event callback for given message id

Parameters

ctx	opaque vapi context
id	message id

Definition at line 828 of file vapi.c.

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◆ vapi_clear_generic_event_cb()

void vapi_clear_generic_event_cb ( vapi_ctx_t ctx )

clear generic event callback

Parameters

ctx	opaque vapi context

Definition at line 842 of file vapi.c.

◆ vapi_connect()

vapi_error_e vapi_connect	(	vapi_ctx_t	ctx,
		const char *	name,
		const char *	chroot_prefix,
		int	max_outstanding_requests,
		int	response_queue_size,
		vapi_mode_e	mode,
		bool	handle_keepalives
	)

connect to vpp

Parameters

ctx	opaque vapi context, must be allocated using vapi_ctx_alloc first
name	application name
chroot_prefix	shared memory prefix
max_outstanding_requests	max number of outstanding requests queued
response_queue_size	size of the response queue
mode	mode of operation - blocking or nonblocking
handle_keepalives	- if true, automatically handle memclnt_keepalive

Returns: VAPI_OK on success, other error code on error

Definition at line 301 of file vapi.c.

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◆ vapi_ctx_alloc()

vapi_error_e vapi_ctx_alloc ( vapi_ctx_t * result )

allocate vapi context

Parameters

[out] pointer to result variable

Returns: VAPI_OK on success, other error code on error

Definition at line 251 of file vapi.c.

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◆ vapi_ctx_free()

void vapi_ctx_free ( vapi_ctx_t ctx )

free vapi context

Definition at line 283 of file vapi.c.

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◆ vapi_disconnect()

vapi_error_e vapi_disconnect ( vapi_ctx_t ctx )

disconnect from vpp

Parameters

ctx	opaque vapi context

Returns: VAPI_OK on success, other error code on error

Definition at line 419 of file vapi.c.

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◆ vapi_dispatch()

vapi_error_e vapi_dispatch ( vapi_ctx_t ctx )

loop vapi_dispatch_one until responses to all currently outstanding requests have been received and their callbacks called

Note: the dispatch loop is interrupted if any error is encountered or returned from the callback, in which case this error is returned as the result of vapi_dispatch. In this case it might be necessary to call dispatch again to process the remaining messages. Returning VAPI_EUSER from a callback allows the user to break the dispatch loop (and distinguish this case in the calling code from other failures). VAPI never returns VAPI_EUSER on its own.

Returns: VAPI_OK on success, other error code on error

Definition at line 804 of file vapi.c.

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◆ vapi_dispatch_one()

vapi_error_e vapi_dispatch_one ( vapi_ctx_t ctx )

pick next message sent by vpp and call the appropriate callback

Returns: VAPI_OK on success, other error code on error

Definition at line 747 of file vapi.c.

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◆ vapi_get_fd()

vapi_error_e vapi_get_fd	(	vapi_ctx_t	ctx,
		int *	fd
	)

get event file descriptor

Note: this file descriptor becomes readable when messages (from vpp) are waiting in queue

Parameters

	ctx	opaque vapi context
[out]	fd	pointer to result variable

Returns: VAPI_OK on success, other error code on error

Definition at line 435 of file vapi.c.

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◆ vapi_is_msg_available()

bool vapi_is_msg_available	(	vapi_ctx_t	ctx,
		vapi_msg_id_t	type
	)

check if message identified by it's message id is known by the vpp to which the connection is open

Definition at line 295 of file vapi.c.

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◆ vapi_msg_alloc()

void* vapi_msg_alloc	(	vapi_ctx_t	ctx,
		size_t	size
	)

allocate vapi message of given size

Note: message must be freed by vapi_msg_free if not consumed by vapi_send call

Parameters

ctx	opaque vapi context

Returns: pointer to message or NULL if out of memory

Definition at line 217 of file vapi.c.

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◆ vapi_msg_free()

void vapi_msg_free	(	vapi_ctx_t	ctx,
		void *	msg
	)

free a vapi message

Note: messages received by vapi_recv must be freed when no longer needed

Parameters

ctx	opaque vapi context
msg	message to be freed

Definition at line 228 of file vapi.c.

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◆ vapi_recv()

vapi_error_e vapi_recv	(	vapi_ctx_t	ctx,
		void **	msg,
		size_t *	msg_size,
		svm_q_conditional_wait_t	cond,
		u32	time
	)

low-level api for reading messages from vpp

Note: it is not recommended to use this api directly, use generated api instead

Parameters

	ctx	opaque vapi context
[out]	msg	pointer to result variable containing message
[out]	msg_size	pointer to result variable containing message size
	cond	enum type for blocking, non-blocking or timed wait call
	time	in sec for timed wait

Returns: VAPI_OK on success, other error code on error

Definition at line 527 of file vapi.c.

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◆ vapi_send()

vapi_error_e vapi_send	(	vapi_ctx_t	ctx,
		void *	msg
	)

low-level api for sending messages to vpp

Note: it is not recommended to use this api directly, use generated api instead

Parameters

ctx	opaque vapi context
msg	message to send

Returns: VAPI_OK on success, other error code on error

Definition at line 441 of file vapi.c.

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◆ vapi_send2()

vapi_error_e vapi_send2	(	vapi_ctx_t	ctx,
		void *	msg1,
		void *	msg2
	)

low-level api for atomically sending two messages to vpp - either both messages are sent or neither one is

Note: it is not recommended to use this api directly, use generated api instead

Parameters

ctx	opaque vapi context
msg1	first message to send
msg2	second message to send

Returns: VAPI_OK on success, other error code on error

Definition at line 483 of file vapi.c.

◆ vapi_set_event_cb()

void vapi_set_event_cb	(	vapi_ctx_t	ctx,
		vapi_msg_id_t	id,
		vapi_event_cb	callback,
		void *	callback_ctx
	)

set event callback to call when message with given id is dispatched

Parameters

ctx	opaque vapi context
id	message id
callback	callback
callback_ctx	context pointer stored and passed to callback

Definition at line 819 of file vapi.c.

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◆ vapi_set_generic_event_cb()

void vapi_set_generic_event_cb	(	vapi_ctx_t	ctx,
		vapi_generic_event_cb	callback,
		void *	callback_ctx
	)

set generic event callback

Note: this callback is called by dispatch if no message-type specific callback is set (so it's a fallback callback)

Parameters

ctx	opaque vapi context
callback	callback
callback_ctx	context pointer stored and passed to callback

Definition at line 834 of file vapi.c.

◆ vapi_wait()

vapi_error_e vapi_wait	(	vapi_ctx_t	ctx,
		vapi_wait_mode_e	mode
	)

wait for connection to become readable or writable

Parameters

ctx	opaque vapi context
mode	type of property to wait for - readability, writability or both

Returns: VAPI_OK on success, other error code on error

Definition at line 616 of file vapi.c.

Typedefs

Functions

Detailed Description

Typedef Documentation

◆ vapi_ctx_t

◆ vapi_event_cb

◆ vapi_generic_event_cb

Function Documentation

◆ vapi_clear_event_cb()

◆ vapi_clear_generic_event_cb()

◆ vapi_connect()

◆ vapi_ctx_alloc()

◆ vapi_ctx_free()

◆ vapi_disconnect()

◆ vapi_dispatch()

◆ vapi_dispatch_one()

◆ vapi_get_fd()

◆ vapi_is_msg_available()

◆ vapi_msg_alloc()

◆ vapi_msg_free()

◆ vapi_recv()

◆ vapi_send()

◆ vapi_send2()

◆ vapi_set_event_cb()

◆ vapi_set_generic_event_cb()

◆ vapi_wait()