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)

Functions
static int	session_send_evt_to_thread (void *data, void *args, u32 thread_index, session_evt_type_t evt_type)
int	session_send_io_evt_to_thread (svm_fifo_t *f, session_evt_type_t evt_type)
int	session_send_io_evt_to_thread_custom (void *data, u32 thread_index, session_evt_type_t evt_type)
int	session_send_ctrl_evt_to_thread (stream_session_t *s, session_evt_type_t evt_type)
void	session_send_rpc_evt_to_thread (u32 thread_index, void *fp, void *rpc_args)
static void	session_program_transport_close (stream_session_t *s)
stream_session_t *	session_alloc (u32 thread_index)
void	session_free (stream_session_t *s)
void	session_free_w_fifos (stream_session_t *s)
static void	session_delete (stream_session_t *s)
	Cleans up session and lookup table. More...
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)
	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...
int	stream_session_accept_notify (transport_connection_t *tc)
void	session_transport_closing_notify (transport_connection_t *tc)
	Notification from transport that connection is being closed. More...
void	session_transport_delete_notify (transport_connection_t *tc)
	Notification from transport that connection is being deleted. More...
void	session_transport_closed_notify (transport_connection_t *tc)
	Notification from transport that session can be closed. More...
void	session_transport_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_wrk_index, session_endpoint_t *rmt, u32 opaque)
int	session_open_vc (u32 app_wrk_index, session_endpoint_t *rmt, u32 opaque)
int	session_open_app (u32 app_wrk_index, session_endpoint_t *rmt, u32 opaque)
int	session_open (u32 app_wrk_index, session_endpoint_t *rmt, u32 opaque)
	Ask transport to open connection to remote transport endpoint. More...
int	session_listen (stream_session_t *ls, session_endpoint_cfg_t *sep)
	Ask transport to listen on session endpoint. More...
int	session_stop_listen (stream_session_t *s)
	Ask transport to stop listening on local transport endpoint. More...
void	session_close (stream_session_t *s)
	Initialize session closing procedure. More...
void	session_transport_close (stream_session_t *s)
	Notify transport the session can be disconnected. More...
void	session_transport_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_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_open_service_fn) (u32, session_endpoint_t *, u32)

Definition at line 1037 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 1378 of file session.c.

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transport_connection_t* listen_session_get_transport

(

stream_session_t *

s

)

Definition at line 1371 of file session.c.

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stream_session_t* session_alloc

(

u32

thread_index

)

Definition at line 144 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 246 of file session.c.

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int session_alloc_fifos	(	segment_manager_t *	sm,
		stream_session_t *	s
	)

Definition at line 202 of file session.c.

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static stream_session_t* session_alloc_for_connection ( transport_connection_t *  tc )

static

Definition at line 226 of file session.c.

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void session_close

(

stream_session_t *

s

)

Initialize session closing procedure.

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

Definition at line 1135 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 1568 of file session.c.

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static void session_delete ( stream_session_t *  s )

static

Cleans up session and lookup table.

Transport connection must still be valid.

Definition at line 190 of file session.c.

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int session_dequeue_notify

(

stream_session_t *

s

)

Definition at line 552 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 735 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 304 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 445 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 273 of file session.c.

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static int session_enqueue_notify ( stream_session_t *  s )

inlinestatic

Notify session peer that new data has been enqueued.

Parameters

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

Returns

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

Definition at line 530 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 392 of file session.c.

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void session_flush_frames_main_thread

(

vlib_main_t *

vm

)

Definition at line 1398 of file session.c.

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void session_free

(

stream_session_t *

s

)

Definition at line 169 of file session.c.

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void session_free_w_fifos

(

stream_session_t *

s

)

Definition at line 177 of file session.c.

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transport_connection_t* session_get_transport

(

stream_session_t *

s

)

Definition at line 1358 of file session.c.

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int session_listen	(	stream_session_t *	ls,
		session_endpoint_cfg_t *	sep
	)

Ask transport to listen on session endpoint.

Parameters

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

Definition at line 1076 of file session.c.

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int session_manager_flush_all_enqueue_events

(

u8

transport_proto

)

Definition at line 605 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 576 of file session.c.

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ssvm_private_t* session_manager_get_evt_q_segment

(

void

)

Definition at line 1305 of file session.c.

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static clib_error_t* session_manager_main_enable ( vlib_main_t *  vm )

static

Definition at line 1406 of file session.c.

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clib_error_t* session_manager_main_init

(

vlib_main_t *

vm

)

Definition at line 1550 of file session.c.

void session_node_enable_disable

(

u8

is_en

)

Definition at line 1495 of file session.c.

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int session_open	(	u32	app_wrk_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 1061 of file session.c.

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

Definition at line 1026 of file session.c.

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

Definition at line 953 of file session.c.

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

Definition at line 991 of file session.c.

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static void session_program_transport_close ( stream_session_t *  s )

static

Definition at line 123 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 1329 of file session.c.

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int session_send_ctrl_evt_to_thread	(	stream_session_t *	s,
		session_evt_type_t	evt_type
	)

Definition at line 101 of file session.c.

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static int session_send_evt_to_thread ( void *  data, void *  args, u32  thread_index, session_evt_type_t  evt_type  )

inlinestatic

Definition at line 31 of file session.c.

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int session_send_io_evt_to_thread	(	svm_fifo_t *	f,
		session_evt_type_t	evt_type
	)

Definition at line 88 of file session.c.

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int session_send_io_evt_to_thread_custom	(	void *	data,
		u32	thread_index,
		session_evt_type_t	evt_type
	)

Definition at line 94 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 111 of file session.c.

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int 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 1106 of file session.c.

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int session_stream_connect_notify	(	transport_connection_t *	tc,
		u8	is_fail
	)

Definition at line 630 of file session.c.

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static void session_switch_pool ( void *  cb_args )

static

Definition at line 716 of file session.c.

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void session_transport_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 1197 of file session.c.

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void session_transport_close

(

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 1165 of file session.c.

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void session_transport_closed_notify

(

transport_connection_t *

tc

)

Notification from transport that session can be closed.

Should be called by transport only if it was closed with non-empty tx fifo and once it decides to begin the closing procedure prior to issuing a delete notify. This gives the chance to the session layer to cleanup any outstanding events.

Definition at line 875 of file session.c.

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void session_transport_closing_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 794 of file session.c.

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void session_transport_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 820 of file session.c.

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void session_transport_reset_notify

(

transport_connection_t *

tc

)

Notify application that connection has been reset.

Definition at line 904 of file session.c.

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transport_service_type_t session_transport_service_type

(

stream_session_t *

s

)

Definition at line 1211 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 1219 of file session.c.

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u32 session_tx_fifo_max_dequeue

(

transport_connection_t *

tc

)

Definition at line 498 of file session.c.

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u8 session_tx_is_dgram

(

stream_session_t *

s

)

Definition at line 1227 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 1242 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 923 of file session.c.

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int stream_session_accept_notify

(

transport_connection_t *

tc

)

Definition at line 771 of file session.c.

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u32 stream_session_dequeue_drop	(	transport_connection_t *	tc,
		u32	max_bytes
	)

Definition at line 515 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 620 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 483 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 507 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 1529 of file session.c.

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Variable Documentation

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 1040 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 1314 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.