session.c File Reference

Session and session manager. More...

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Typedefs
typedef struct _session_switch_pool_args	session_switch_pool_args_t
typedef int(*	session_open_service_fn) (u32, session_endpoint_t *, u32)
typedef int(*	session_listen_service_fn) (stream_session_t *, session_endpoint_t *)

Functions
static void	session_send_evt_to_thread (u64 session_handle, fifo_event_type_t evt_type, u32 thread_index, void *fp, void *rpc_args)
void	session_send_session_evt_to_thread (u64 session_handle, fifo_event_type_t evt_type, u32 thread_index)
void	session_send_rpc_evt_to_thread (u32 thread_index, void *fp, void *rpc_args)
stream_session_t *	session_alloc (u32 thread_index)
void	session_free (stream_session_t *s)
int	session_alloc_fifos (segment_manager_t *sm, stream_session_t *s)
static stream_session_t *	session_alloc_for_connection (transport_connection_t *tc)
static int	session_alloc_and_init (segment_manager_t *sm, transport_connection_t *tc, u8 alloc_fifos, stream_session_t **ret_s)
static void	session_enqueue_discard_chain_bytes (vlib_main_t *vm, vlib_buffer_t *b, vlib_buffer_t **chain_b, u32 n_bytes_to_drop)
	Discards bytes from buffer chain. More...
static int	session_enqueue_chain_tail (stream_session_t *s, vlib_buffer_t *b, u32 offset, u8 is_in_order)
	Enqueue buffer chain tail. More...
int	session_enqueue_stream_connection (transport_connection_t *tc, vlib_buffer_t *b, u32 offset, u8 queue_event, u8 is_in_order)
int	session_enqueue_dgram_connection (stream_session_t *s, session_dgram_hdr_t *hdr, vlib_buffer_t *b, u8 proto, u8 queue_event)
u8	stream_session_no_space (transport_connection_t *tc, u32 thread_index, u16 data_len)
	Check if we have space in rx fifo to push more bytes. More...
u32	session_tx_fifo_max_dequeue (transport_connection_t *tc)
int	stream_session_peek_bytes (transport_connection_t *tc, u8 *buffer, u32 offset, u32 max_bytes)
u32	stream_session_dequeue_drop (transport_connection_t *tc, u32 max_bytes)
static int	session_enqueue_notify (stream_session_t *s, u8 block)
	Notify session peer that new data has been enqueued. More...
int	session_dequeue_notify (stream_session_t *s)
int	session_manager_flush_enqueue_events (u8 transport_proto, u32 thread_index)
	Flushes queue of sessions that are to be notified of new data enqueued events. More...
int	session_manager_flush_all_enqueue_events (u8 transport_proto)
void	stream_session_init_fifos_pointers (transport_connection_t *tc, u32 rx_pointer, u32 tx_pointer)
	Init fifo tail and head pointers. More...
int	session_stream_connect_notify (transport_connection_t *tc, u8 is_fail)
static void	session_switch_pool (void *cb_args)
int	session_dgram_connect_notify (transport_connection_t *tc, u32 old_thread_index, stream_session_t **new_session)
	Move dgram session to the right thread. More...
void	stream_session_accept_notify (transport_connection_t *tc)
void	stream_session_disconnect_notify (transport_connection_t *tc)
	Notification from transport that connection is being closed. More...
void	stream_session_delete (stream_session_t *s)
	Cleans up session and lookup table. More...
void	stream_session_delete_notify (transport_connection_t *tc)
	Notification from transport that connection is being deleted. More...
void	stream_session_reset_notify (transport_connection_t *tc)
	Notify application that connection has been reset. More...
int	stream_session_accept (transport_connection_t *tc, u32 listener_index, u8 notify)
	Accept a stream session. More...
int	session_open_cl (u32 app_index, session_endpoint_t *rmt, u32 opaque)
int	session_open_vc (u32 app_index, session_endpoint_t *rmt, u32 opaque)
int	session_open_app (u32 app_index, session_endpoint_t *rmt, u32 opaque)
int	session_open (u32 app_index, session_endpoint_t *rmt, u32 opaque)
	Ask transport to open connection to remote transport endpoint. More...
int	session_listen_vc (stream_session_t *s, session_endpoint_t *sep)
int	session_listen_cl (stream_session_t *s, session_endpoint_t *sep)
int	session_listen_app (stream_session_t *s, session_endpoint_t *sep)
int	stream_session_listen (stream_session_t *s, session_endpoint_t *sep)
	Ask transport to listen on local transport endpoint. More...
int	stream_session_stop_listen (stream_session_t *s)
	Ask transport to stop listening on local transport endpoint. More...
void	stream_session_disconnect (stream_session_t *s)
	Initialize session disconnect. More...
void	stream_session_disconnect_transport (stream_session_t *s)
	Notify transport the session can be disconnected. More...
void	stream_session_cleanup (stream_session_t *s)
	Cleanup transport and session state. More...
transport_service_type_t	session_transport_service_type (stream_session_t *s)
transport_tx_fn_type_t	session_transport_tx_fn_type (stream_session_t *s)
u8	session_tx_is_dgram (stream_session_t *s)
void	session_vpp_event_queues_allocate (session_manager_main_t *smm)
	Allocate event queues in the shared-memory segment. More...
ssvm_private_t *	session_manager_get_evt_q_segment (void)
void	session_register_transport (transport_proto_t transport_proto, const transport_proto_vft_t *vft, u8 is_ip4, u32 output_node)
	Initialize session layer for given transport proto and ip version. More...
transport_connection_t *	session_get_transport (stream_session_t *s)
transport_connection_t *	listen_session_get_transport (stream_session_t *s)
int	listen_session_get_local_session_endpoint (stream_session_t *listener, session_endpoint_t *sep)
void	session_flush_frames_main_thread (vlib_main_t *vm)
static clib_error_t *	session_manager_main_enable (vlib_main_t *vm)
void	session_node_enable_disable (u8 is_en)
clib_error_t *	vnet_session_enable_disable (vlib_main_t *vm, u8 is_en)
clib_error_t *	session_manager_main_init (vlib_main_t *vm)
static clib_error_t *	session_config_fn (vlib_main_t *vm, unformat_input_t *input)

Variables
session_manager_main_t	session_manager_main
transport_proto_vft_t *	tp_vfts
	Per-type vector of transport protocol virtual function tables. More...
static session_open_service_fn	session_open_srv_fns [TRANSPORT_N_SERVICES]
static session_listen_service_fn	session_listen_srv_fns [TRANSPORT_N_SERVICES]
static session_fifo_rx_fn *	session_tx_fns [TRANSPORT_TX_N_FNS]

Detailed Description

Session and session manager.

Definition in file session.c.

Typedef Documentation

typedef int(* session_listen_service_fn) (stream_session_t *, session_endpoint_t *)

Definition at line 1028 of file session.c.

typedef int(* session_open_service_fn) (u32, session_endpoint_t *, u32)

Definition at line 926 of file session.c.

typedef struct _session_switch_pool_args session_switch_pool_args_t

Function Documentation

int listen_session_get_local_session_endpoint	(	stream_session_t *	listener,
		session_endpoint_t *	sep
	)

Definition at line 1318 of file session.c.

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transport_connection_t* listen_session_get_transport

(

stream_session_t *

s

)

Definition at line 1311 of file session.c.

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stream_session_t* session_alloc

(

u32

thread_index

)

Definition at line 81 of file session.c.

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static int session_alloc_and_init ( segment_manager_t *  sm, transport_connection_t *  tc, u8  alloc_fifos, stream_session_t **  ret_s  )

static

Definition at line 160 of file session.c.

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int session_alloc_fifos	(	segment_manager_t *	sm,
		stream_session_t *	s
	)

Definition at line 116 of file session.c.

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static stream_session_t* session_alloc_for_connection ( transport_connection_t *  tc )

static

Definition at line 140 of file session.c.

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static clib_error_t* session_config_fn ( vlib_main_t *  vm, unformat_input_t *  input  )

static

Definition at line 1504 of file session.c.

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int session_dequeue_notify

(

stream_session_t *

s

)

Definition at line 505 of file session.c.

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int session_dgram_connect_notify	(	transport_connection_t *	tc,
		u32	old_thread_index,
		stream_session_t **	new_session
	)

Move dgram session to the right thread.

Definition at line 693 of file session.c.

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static int session_enqueue_chain_tail ( stream_session_t *  s, vlib_buffer_t *  b, u32  offset, u8  is_in_order  )

inlinestatic

Enqueue buffer chain tail.

Definition at line 218 of file session.c.

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int session_enqueue_dgram_connection	(	stream_session_t *	s,
		session_dgram_hdr_t *	hdr,
		vlib_buffer_t *	b,
		u8	proto,
		u8	queue_event
	)

Definition at line 362 of file session.c.

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static void session_enqueue_discard_chain_bytes ( vlib_main_t *  vm, vlib_buffer_t *  b, vlib_buffer_t **  chain_b, u32  n_bytes_to_drop  )

inlinestatic

Discards bytes from buffer chain.

It discards n_bytes_to_drop starting at first buffer after chain_b

Definition at line 187 of file session.c.

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static int session_enqueue_notify ( stream_session_t *  s, u8  block  )

static

Notify session peer that new data has been enqueued.

Parameters

s	Stream session for which the event is to be generated.
block	Flag to indicate if call should block if event queue is full.

Returns

0 on succes or negative number if failed to send notification.

Definition at line 449 of file session.c.

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int session_enqueue_stream_connection	(	transport_connection_t *	tc,
		vlib_buffer_t *	b,
		u32	offset,
		u8	queue_event,
		u8	is_in_order
	)

Definition at line 306 of file session.c.

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void session_flush_frames_main_thread

(

vlib_main_t *

vm

)

Definition at line 1338 of file session.c.

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void session_free

(

stream_session_t *

s

)

Definition at line 108 of file session.c.

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transport_connection_t* session_get_transport

(

stream_session_t *

s

)

Definition at line 1298 of file session.c.

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int session_listen_app	(	stream_session_t *	s,
		session_endpoint_t *	sep
	)

Definition at line 1018 of file session.c.

int session_listen_cl	(	stream_session_t *	s,
		session_endpoint_t *	sep
	)

Definition at line 984 of file session.c.

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int session_listen_vc	(	stream_session_t *	s,
		session_endpoint_t *	sep
	)

Definition at line 957 of file session.c.

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int session_manager_flush_all_enqueue_events

(

u8

transport_proto

)

Definition at line 566 of file session.c.

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int session_manager_flush_enqueue_events	(	u8	transport_proto,
		u32	thread_index
	)

Flushes queue of sessions that are to be notified of new data enqueued events.

Parameters

thread_index

Thread index for which the flush is to be performed.

Returns

0 on success or a positive number indicating the number of failures due to API queue being full.

Definition at line 542 of file session.c.

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ssvm_private_t* session_manager_get_evt_q_segment

(

void

)

Definition at line 1245 of file session.c.

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static clib_error_t* session_manager_main_enable ( vlib_main_t *  vm )

static

Definition at line 1346 of file session.c.

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clib_error_t* session_manager_main_init

(

vlib_main_t *

vm

)

Definition at line 1491 of file session.c.

void session_node_enable_disable

(

u8

is_en

)

Definition at line 1436 of file session.c.

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int session_open	(	u32	app_index,
		session_endpoint_t *	rmt,
		u32	opaque
	)

Ask transport to open connection to remote transport endpoint.

Stores handle for matching request with reply since the call can be asynchronous. For instance, for TCP the 3-way handshake must complete before reply comes. Session is only created once connection is established.

Parameters

app_index	Index of the application requesting the connect
st	Session type requested.
tep	Remote transport endpoint
opaque	Opaque data (typically, api_context) the application expects on open completion.

Definition at line 950 of file session.c.

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int session_open_app	(	u32	app_index,
		session_endpoint_t *	rmt,
		u32	opaque
	)

Definition at line 917 of file session.c.

int session_open_cl	(	u32	app_index,
		session_endpoint_t *	rmt,
		u32	opaque
	)

Definition at line 846 of file session.c.

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int session_open_vc	(	u32	app_index,
		session_endpoint_t *	rmt,
		u32	opaque
	)

Definition at line 882 of file session.c.

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void session_register_transport	(	transport_proto_t	transport_proto,
		const transport_proto_vft_t *	vft,
		u8	is_ip4,
		u32	output_node
	)

Initialize session layer for given transport proto and ip version.

Allocates per session type (transport proto + ip version) data structures and adds arc from session queue node to session type output node.

Definition at line 1269 of file session.c.

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static void session_send_evt_to_thread ( u64  session_handle, fifo_event_type_t  evt_type, u32  thread_index, void *  fp, void *  rpc_args  )

static

Definition at line 31 of file session.c.

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void session_send_rpc_evt_to_thread	(	u32	thread_index,
		void *	fp,
		void *	rpc_args
	)

Definition at line 68 of file session.c.

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void session_send_session_evt_to_thread	(	u64	session_handle,
		fifo_event_type_t	evt_type,
		u32	thread_index
	)

Definition at line 60 of file session.c.

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int session_stream_connect_notify	(	transport_connection_t *	tc,
		u8	is_fail
	)

Definition at line 591 of file session.c.

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static void session_switch_pool ( void *  cb_args )

static

Definition at line 674 of file session.c.

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transport_service_type_t session_transport_service_type

(

stream_session_t *

s

)

Definition at line 1165 of file session.c.

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transport_tx_fn_type_t session_transport_tx_fn_type

(

stream_session_t *

s

)

Definition at line 1173 of file session.c.

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u32 session_tx_fifo_max_dequeue

(

transport_connection_t *

tc

)

Definition at line 417 of file session.c.

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u8 session_tx_is_dgram

(

stream_session_t *

s

)

Definition at line 1181 of file session.c.

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void session_vpp_event_queues_allocate

(

session_manager_main_t *

smm

)

Allocate event queues in the shared-memory segment.

That can either be a newly created memfd segment, that will need to be mapped by all stack users, or the binary api's svm region. The latter is assumed to be already mapped. NOTE that this assumption DOES NOT hold if api clients bootstrap shm api over sockets (i.e. use memfd segments) and vpp uses api svm region for event queues.

Definition at line 1196 of file session.c.

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int stream_session_accept	(	transport_connection_t *	tc,
		u32	listener_index,
		u8	notify
	)

Accept a stream session.

Optionally ping the server by callback.

Definition at line 816 of file session.c.

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void stream_session_accept_notify

(

transport_connection_t *

tc

)

Definition at line 729 of file session.c.

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void stream_session_cleanup

(

stream_session_t *

s

)

Cleanup transport and session state.

Notify transport of the cleanup and free the session. This should be called only if transport reported some error and is already closed.

Definition at line 1149 of file session.c.

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void stream_session_delete

(

stream_session_t *

s

)

Cleans up session and lookup table.

Transport connection must still be valid.

Definition at line 764 of file session.c.

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void stream_session_delete_notify

(

transport_connection_t *

tc

)

Notification from transport that connection is being deleted.

This removes the session if it is still valid. It should be called only on previously fully established sessions. For instance failed connects should call stream_session_connect_notify and indicate that the connect has failed.

Definition at line 787 of file session.c.

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u32 stream_session_dequeue_drop	(	transport_connection_t *	tc,
		u32	max_bytes
	)

Definition at line 434 of file session.c.

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void stream_session_disconnect

(

stream_session_t *

s

)

Initialize session disconnect.

Request is always sent to session node to ensure that all outstanding requests are served before transport is notified.

Definition at line 1090 of file session.c.

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void stream_session_disconnect_notify

(

transport_connection_t *

tc

)

Notification from transport that connection is being closed.

A disconnect is sent to application but state is not removed. Once disconnect is acknowledged by application, session disconnect is called. Ultimately this leads to close being called on transport (passive close).

Definition at line 747 of file session.c.

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void stream_session_disconnect_transport

(

stream_session_t *

s

)

Notify transport the session can be disconnected.

This should eventually result in a delete notification that allows us to cleanup session state. Called for both active/passive disconnects.

Must be called from the session's thread.

Definition at line 1134 of file session.c.

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void stream_session_init_fifos_pointers	(	transport_connection_t *	tc,
		u32	rx_pointer,
		u32	tx_pointer
	)

Init fifo tail and head pointers.

Useful if transport uses absolute offsets for tracking ooo segments.

Definition at line 581 of file session.c.

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int stream_session_listen	(	stream_session_t *	s,
		session_endpoint_t *	sep
	)

Ask transport to listen on local transport endpoint.

Parameters

s	Session for which listen will be called. Note that unlike established sessions, listen sessions are not associated to a thread.
tep	Local endpoint to be listened on.

Definition at line 1049 of file session.c.

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u8 stream_session_no_space	(	transport_connection_t *	tc,
		u32	thread_index,
		u16	data_len
	)

Check if we have space in rx fifo to push more bytes.

Definition at line 402 of file session.c.

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int stream_session_peek_bytes	(	transport_connection_t *	tc,
		u8 *	buffer,
		u32	offset,
		u32	max_bytes
	)

Definition at line 426 of file session.c.

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void stream_session_reset_notify

(

transport_connection_t *

tc

)

Notify application that connection has been reset.

Definition at line 802 of file session.c.

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int stream_session_stop_listen

(

stream_session_t *

s

)

Ask transport to stop listening on local transport endpoint.

Parameters

s	Session to stop listening on. It must be in state LISTENING.

Definition at line 1061 of file session.c.

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clib_error_t* vnet_session_enable_disable	(	vlib_main_t *	vm,
		u8	is_en
	)

Definition at line 1470 of file session.c.

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Variable Documentation

session_listen_service_fn session_listen_srv_fns[TRANSPORT_N_SERVICES]

static

Initial value:

= {
  session_listen_vc,
  session_listen_cl,
  session_listen_app,
}

Definition at line 1033 of file session.c.

session_manager_main_t session_manager_main

Definition at line 27 of file session.c.

session_open_service_fn session_open_srv_fns[TRANSPORT_N_SERVICES]

static

Initial value:

= {
  session_open_vc,
  session_open_cl,
  session_open_app,
}

Definition at line 929 of file session.c.

session_fifo_rx_fn* session_tx_fns[TRANSPORT_TX_N_FNS]

static

Initial value:

= {
    session_tx_fifo_peek_and_snd,
    session_tx_fifo_dequeue_and_snd,
    session_tx_fifo_dequeue_internal,
    session_tx_fifo_dequeue_and_snd
}

Definition at line 1254 of file session.c.

transport_proto_vft_t* tp_vfts

Per-type vector of transport protocol virtual function tables.

Definition at line 23 of file transport.c.