session.h File Reference

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Data Structures
struct	session_tx_context_
struct	session_worker_
struct	session_main_

Macros
#define	foreach_session_input_error
#define	SESSION_Q_PROCESS_FLUSH_FRAMES   1
#define	SESSION_Q_PROCESS_STOP   2
#define	session_cli_return_if_not_enabled()

Typedefs
typedef struct session_tx_context_	session_tx_context_t
typedef struct session_worker_	session_worker_t
typedef int()	session_fifo_rx_fn(vlib_main_t *vm, vlib_node_runtime_t *node, session_worker_t *wrk, session_event_t *e, int *n_tx_pkts)
typedef struct session_main_	session_main_t

Enumerations
enum	session_error_t { SESSION_N_ERROR }

Functions
u8	session_node_lookup_fifo_event (svm_fifo_t *f, session_event_t *e)
static u8	session_is_valid (u32 si, u8 thread_index)
session_t *	session_alloc (u32 thread_index)
void	session_free (session_t *s)
void	session_free_w_fifos (session_t *s)
static session_t *	session_get (u32 si, u32 thread_index)
static session_t *	session_get_if_valid (u64 si, u32 thread_index)
static session_t *	session_get_from_handle (session_handle_t handle)
static session_t *	session_get_from_handle_if_valid (session_handle_t handle)
u64	session_segment_handle (session_t *s)
static void	session_pool_add_peeker (u32 thread_index)
	Acquires a lock that blocks a session pool from expanding. More...
static void	session_pool_remove_peeker (u32 thread_index)
static session_t *	session_get_from_handle_safe (u64 handle)
	Get session from handle and 'lock' pool resize if not in same thread. More...
static u32	session_get_index (session_t *s)
static session_t *	session_clone_safe (u32 session_index, u32 thread_index)
int	session_open (u32 app_index, session_endpoint_t *tep, u32 opaque)
	Ask transport to open connection to remote transport endpoint. More...
int	session_listen (session_t *s, session_endpoint_cfg_t *sep)
	Ask transport to listen on session endpoint. More...
int	session_stop_listen (session_t *s)
	Ask transport to stop listening on local transport endpoint. More...
void	session_close (session_t *s)
	Initialize session closing procedure. More...
void	session_transport_close (session_t *s)
	Notify transport the session can be disconnected. More...
void	session_transport_cleanup (session_t *s)
	Cleanup transport and session state. More...
int	session_send_io_evt_to_thread (svm_fifo_t *f, session_evt_type_t evt_type)
int	session_enqueue_notify (session_t *s)
int	session_dequeue_notify (session_t *s)
int	session_send_io_evt_to_thread_custom (void *data, u32 thread_index, session_evt_type_t evt_type)
void	session_send_rpc_evt_to_thread (u32 thread_index, void *fp, void *rpc_args)
void	session_send_rpc_evt_to_thread_force (u32 thread_index, void *fp, void *rpc_args)
transport_connection_t *	session_get_transport (session_t *s)
u8 *	format_session (u8 *s, va_list *args)
	Format stream session as per the following format. More...
uword	unformat_session (unformat_input_t *input, va_list *args)
uword	unformat_transport_connection (unformat_input_t *input, va_list *args)
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 (session_t *s, session_dgram_hdr_t *hdr, vlib_buffer_t *b, u8 proto, u8 queue_event)
int	session_stream_connect_notify (transport_connection_t *tc, u8 is_fail)
int	session_dgram_connect_notify (transport_connection_t *tc, u32 old_thread_index, session_t **new_session)
	Move dgram session to the right thread. More...
int	session_stream_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	session_stream_accept (transport_connection_t *tc, u32 listener_index, u8 notify)
	Accept a stream session. More...
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...
int	session_tx_fifo_peek_bytes (transport_connection_t *tc, u8 *buffer, u32 offset, u32 max_bytes)
u32	session_tx_fifo_dequeue_drop (transport_connection_t *tc, u32 max_bytes)
static u32	transport_max_rx_enqueue (transport_connection_t *tc)
static u32	transport_max_tx_dequeue (transport_connection_t *tc)
static u32	transport_max_rx_dequeue (transport_connection_t *tc)
static u32	transport_rx_fifo_size (transport_connection_t *tc)
static u32	transport_tx_fifo_size (transport_connection_t *tc)
static u8	transport_rx_fifo_has_ooo_data (transport_connection_t *tc)
static f64	transport_dispatch_period (u32 thread_index)
static f64	transport_time_now (u32 thread_index)
static void	transport_add_tx_event (transport_connection_t *tc)
static u64	listen_session_get_handle (session_t *s)
static session_t *	listen_session_get_from_handle (session_handle_t handle)
static void	listen_session_parse_handle (session_handle_t handle, u32 *index, u32 *thread_index)
static session_t *	listen_session_alloc (u8 thread_index, session_type_t type)
static session_t *	listen_session_get (u32 ls_index)
static void	listen_session_free (session_t *s)
transport_connection_t *	listen_session_get_transport (session_t *s)
static session_main_t *	vnet_get_session_main ()
static session_worker_t *	session_main_get_worker (u32 thread_index)
static svm_msg_q_t *	session_main_get_vpp_event_queue (u32 thread_index)
static u8	session_main_is_enabled ()
int	session_main_flush_enqueue_events (u8 proto, u32 thread_index)
	Flushes queue of sessions that are to be notified of new data enqueued events. More...
int	session_main_flush_all_enqueue_events (u8 transport_proto)
void	session_flush_frames_main_thread (vlib_main_t *vm)
ssvm_private_t *	session_main_get_evt_q_segment (void)
void	session_node_enable_disable (u8 is_en)
clib_error_t *	vnet_session_enable_disable (vlib_main_t *vm, u8 is_en)

Variables
session_fifo_rx_fn	session_tx_fifo_peek_and_snd
session_fifo_rx_fn	session_tx_fifo_dequeue_and_snd
session_fifo_rx_fn	session_tx_fifo_dequeue_internal
session_main_t	session_main
vlib_node_registration_t	session_queue_node
	(constructor) VLIB_REGISTER_NODE (session_queue_node) More...
vlib_node_registration_t	session_queue_process_node
	(constructor) VLIB_REGISTER_NODE (session_queue_process_node) More...
vlib_node_registration_t	session_queue_pre_input_node
	(constructor) VLIB_REGISTER_NODE (session_queue_pre_input_node) More...

Macro Definition Documentation

foreach_session_input_error

#define foreach_session_input_error

Value:

_(NO_SESSION, "No session drops")                                       \
_(NO_LISTENER, "No listener for dst port drops")                        \
_(ENQUEUED, "Packets pushed into rx fifo")                              \
_(NOT_READY, "Session not ready packets")                               \
_(FIFO_FULL, "Packets dropped for lack of rx fifo space")               \
_(EVENT_FIFO_FULL, "Events not sent for lack of event fifo space")      \
_(API_QUEUE_FULL, "Sessions not created for lack of API queue space")   \
_(NEW_SEG_NO_SPACE, "Created segment, couldn't allocate a fifo pair")   \
_(NO_SPACE, "Couldn't allocate a fifo pair")                            \
_(SEG_CREATE, "Couldn't create a new segment")

Definition at line 24 of file session.h.

session_cli_return_if_not_enabled

#define session_cli_return_if_not_enabled

(

)

Value:

do {                                                                    \
    if (!session_main.is_enabled)                               \
      return clib_error_return(0, "session layer is not enabled");      \
} while (0)

Definition at line 516 of file session.h.

SESSION_Q_PROCESS_FLUSH_FRAMES

#define SESSION_Q_PROCESS_FLUSH_FRAMES   1

Definition at line 186 of file session.h.

SESSION_Q_PROCESS_STOP

#define SESSION_Q_PROCESS_STOP   2

Definition at line 187 of file session.h.

Typedef Documentation

session_fifo_rx_fn

typedef int() session_fifo_rx_fn(vlib_main_t *vm, vlib_node_runtime_t *node, session_worker_t *wrk, session_event_t *e, int *n_tx_pkts)

Definition at line 108 of file session.h.

session_main_t

typedef struct session_main_ session_main_t

session_tx_context_t

typedef struct session_tx_context_ session_tx_context_t

session_worker_t

typedef struct session_worker_ session_worker_t

Enumeration Type Documentation

session_error_t

enum session_error_t

Enumerator
SESSION_N_ERROR

Definition at line 36 of file session.h.

Function Documentation

format_session()

u8* format_session	(	u8 *	s,
		va_list *	args
	)

Format stream session as per the following format.

verbose: "Connection", "Rx fifo", "Tx fifo", "Session Index" non-verbose: "Connection"

Definition at line 55 of file session_cli.c.

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listen_session_alloc()

static session_t* listen_session_alloc ( u8  thread_index, session_type_t  type  )

inlinestatic

Definition at line 465 of file session.h.

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listen_session_free()

static void listen_session_free ( session_t *  s )

inlinestatic

Definition at line 481 of file session.h.

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listen_session_get()

static session_t* listen_session_get ( u32  ls_index )

inlinestatic

Definition at line 475 of file session.h.

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listen_session_get_from_handle()

static session_t* listen_session_get_from_handle ( session_handle_t  handle )

inlinestatic

Definition at line 452 of file session.h.

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listen_session_get_handle()

static u64 listen_session_get_handle ( session_t *  s )

inlinestatic

Definition at line 445 of file session.h.

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listen_session_get_transport()

transport_connection_t* listen_session_get_transport

(

session_t *

s

)

Definition at line 1294 of file session.c.

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listen_session_parse_handle()

static void listen_session_parse_handle ( session_handle_t  handle, u32 *  index, u32 *  thread_index  )

inlinestatic

Definition at line 458 of file session.h.

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session_alloc()

session_t* session_alloc

(

u32

thread_index

)

Definition at line 150 of file session.c.

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session_clone_safe()

static session_t* session_clone_safe ( u32  session_index, u32  thread_index  )

inlinestatic

Definition at line 304 of file session.h.

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session_close()

void session_close

(

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 1069 of file session.c.

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session_dequeue_notify()

int session_dequeue_notify

(

session_t *

s

)

Definition at line 529 of file session.c.

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session_dgram_connect_notify()

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

Move dgram session to the right thread.

Definition at line 682 of file session.c.

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session_enqueue_dgram_connection()

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

Definition at line 408 of file session.c.

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session_enqueue_notify()

int session_enqueue_notify

(

session_t *

s

)

Definition at line 523 of file session.c.

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session_enqueue_stream_connection()

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 355 of file session.c.

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session_flush_frames_main_thread()

void session_flush_frames_main_thread

(

vlib_main_t *

vm

)

Definition at line 1301 of file session.c.

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session_free()

void session_free

(

session_t *

s

)

Definition at line 175 of file session.c.

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session_free_w_fifos()

void session_free_w_fifos

(

session_t *

s

)

Definition at line 189 of file session.c.

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session_get()

static session_t* session_get ( u32  si, u32  thread_index  )

inlinestatic

Definition at line 207 of file session.h.

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session_get_from_handle()

static session_t* session_get_from_handle ( session_handle_t  handle )

inlinestatic

Definition at line 227 of file session.h.

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session_get_from_handle_if_valid()

static session_t* session_get_from_handle_if_valid ( session_handle_t  handle )

inlinestatic

Definition at line 236 of file session.h.

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session_get_from_handle_safe()

static session_t* session_get_from_handle_safe ( u64  handle )

inlinestatic

Get session from handle and 'lock' pool resize if not in same thread.

Caller should drop the peek 'lock' as soon as possible.

Definition at line 279 of file session.h.

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session_get_if_valid()

static session_t* session_get_if_valid ( u64  si, u32  thread_index  )

inlinestatic

Definition at line 214 of file session.h.

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session_get_index()

static u32 session_get_index ( session_t *  s )

inlinestatic

Definition at line 298 of file session.h.

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session_get_transport()

transport_connection_t* session_get_transport

(

session_t *

s

)

Definition at line 1283 of file session.c.

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session_is_valid()

static u8 session_is_valid ( u32  si, u8  thread_index  )

inlinestatic

Definition at line 190 of file session.h.

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session_listen()

int session_listen	(	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 1017 of file session.c.

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session_main_flush_all_enqueue_events()

int session_main_flush_all_enqueue_events

(

u8

transport_proto

)

Definition at line 588 of file session.c.

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session_main_flush_enqueue_events()

int session_main_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 559 of file session.c.

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session_main_get_evt_q_segment()

ssvm_private_t* session_main_get_evt_q_segment

(

void

)

Definition at line 1217 of file session.c.

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session_main_get_vpp_event_queue()

static svm_msg_q_t* session_main_get_vpp_event_queue ( u32  thread_index )

inlinestatic

Definition at line 505 of file session.h.

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session_main_get_worker()

static session_worker_t* session_main_get_worker ( u32  thread_index )

inlinestatic

Definition at line 499 of file session.h.

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session_main_is_enabled()

static u8 session_main_is_enabled ( )

inlinestatic

Definition at line 511 of file session.h.

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session_node_enable_disable()

void session_node_enable_disable

(

u8

is_en

)

Definition at line 1392 of file session.c.

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session_node_lookup_fifo_event()

u8 session_node_lookup_fifo_event	(	svm_fifo_t *	f,
		session_event_t *	e
	)

Definition at line 1124 of file session_node.c.

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session_open()

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 1001 of file session.c.

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session_pool_add_peeker()

static void session_pool_add_peeker ( u32  thread_index )

inlinestatic

Acquires a lock that blocks a session pool from expanding.

This is typically used for safely peeking into other threads' pools in order to clone elements. Lock should be dropped as soon as possible by calling session_pool_remove_peeker.

NOTE: Avoid using pool_elt_at_index while the lock is held because it may lead to free elt bitmap expansion/contraction!

Definition at line 256 of file session.h.

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session_pool_remove_peeker()

static void session_pool_remove_peeker ( u32  thread_index )

inlinestatic

Definition at line 265 of file session.h.

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session_register_transport()

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 1254 of file session.c.

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session_segment_handle()

u64 session_segment_handle

(

session_t *

s

)

Definition at line 1226 of file session.c.

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session_send_io_evt_to_thread()

int session_send_io_evt_to_thread	(	svm_fifo_t *	f,
		session_evt_type_t	evt_type
	)

Definition at line 86 of file session.c.

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session_send_io_evt_to_thread_custom()

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

Definition at line 93 of file session.c.

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session_send_rpc_evt_to_thread()

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

Definition at line 117 of file session.c.

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session_send_rpc_evt_to_thread_force()

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

Definition at line 109 of file session.c.

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session_stop_listen()

int session_stop_listen

(

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 1045 of file session.c.

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session_stream_accept()

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

Accept a stream session.

Optionally ping the server by callback.

Definition at line 868 of file session.c.

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session_stream_accept_notify()

int session_stream_accept_notify

(

transport_connection_t *

tc

)

Definition at line 851 of file session.c.

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session_stream_connect_notify()

int session_stream_connect_notify	(	transport_connection_t *	tc,
		u8	is_fail
	)

Definition at line 598 of file session.c.

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session_transport_cleanup()

void session_transport_cleanup

(

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 1131 of file session.c.

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session_transport_close()

void session_transport_close

(

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 1099 of file session.c.

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session_transport_closed_notify()

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 807 of file session.c.

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session_transport_closing_notify()

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 724 of file session.c.

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session_transport_delete_notify()

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 746 of file session.c.

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session_transport_reset_notify()

void session_transport_reset_notify

(

transport_connection_t *

tc

)

Notify application that connection has been reset.

Definition at line 836 of file session.c.

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session_tx_fifo_dequeue_drop()

u32 session_tx_fifo_dequeue_drop	(	transport_connection_t *	tc,
		u32	max_bytes
	)

Definition at line 453 of file session.c.

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session_tx_fifo_peek_bytes()

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

Definition at line 445 of file session.c.

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transport_add_tx_event()

static void transport_add_tx_event ( transport_connection_t *  tc )

inlinestatic

Definition at line 432 of file session.h.

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transport_dispatch_period()

static f64 transport_dispatch_period ( u32  thread_index )

inlinestatic

Definition at line 420 of file session.h.

transport_max_rx_dequeue()

static u32 transport_max_rx_dequeue ( transport_connection_t *  tc )

inlinestatic

Definition at line 392 of file session.h.

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transport_max_rx_enqueue()

static u32 transport_max_rx_enqueue ( transport_connection_t *  tc )

inlinestatic

Definition at line 378 of file session.h.

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transport_max_tx_dequeue()

static u32 transport_max_tx_dequeue ( transport_connection_t *  tc )

inlinestatic

Definition at line 385 of file session.h.

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transport_rx_fifo_has_ooo_data()

static u8 transport_rx_fifo_has_ooo_data ( transport_connection_t *  tc )

inlinestatic

Definition at line 413 of file session.h.

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transport_rx_fifo_size()

static u32 transport_rx_fifo_size ( transport_connection_t *  tc )

inlinestatic

Definition at line 399 of file session.h.

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transport_time_now()

static f64 transport_time_now ( u32  thread_index )

inlinestatic

Definition at line 426 of file session.h.

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transport_tx_fifo_size()

static u32 transport_tx_fifo_size ( transport_connection_t *  tc )

inlinestatic

Definition at line 406 of file session.h.

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unformat_session()

uword unformat_session	(	unformat_input_t *	input,
		va_list *	args
	)

Definition at line 164 of file session_cli.c.

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unformat_transport_connection()

uword unformat_transport_connection	(	unformat_input_t *	input,
		va_list *	args
	)

Definition at line 195 of file session_cli.c.

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vnet_get_session_main()

static session_main_t* vnet_get_session_main ( )

inlinestatic

Definition at line 493 of file session.h.

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vnet_session_enable_disable()

clib_error_t* vnet_session_enable_disable	(	vlib_main_t *	vm,
		u8	is_en
	)

Definition at line 1426 of file session.c.

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Variable Documentation

session_main

session_main_t session_main

Definition at line 26 of file session.c.

session_queue_node

vlib_node_registration_t session_queue_node

Initial value:

=
{
  .function = session_queue_node_fn,
  .name = "session-queue",
  .format_trace = format_session_queue_trace,
  .type = VLIB_NODE_TYPE_INPUT,
  .n_errors = ARRAY_LEN (session_queue_error_strings),
  .error_strings = session_queue_error_strings,
  .state = VLIB_NODE_STATE_DISABLED,
}

(constructor) VLIB_REGISTER_NODE (session_queue_node)

Definition at line 1022 of file session_node.c.

session_queue_pre_input_node

vlib_node_registration_t session_queue_pre_input_node

(constructor) VLIB_REGISTER_NODE (session_queue_pre_input_node)

Definition at line 1244 of file session_node.c.

session_queue_process_node

vlib_node_registration_t session_queue_process_node

(constructor) VLIB_REGISTER_NODE (session_queue_process_node)

Definition at line 1224 of file session_node.c.

session_tx_fifo_dequeue_and_snd

session_fifo_rx_fn session_tx_fifo_dequeue_and_snd

session_tx_fifo_dequeue_internal

session_fifo_rx_fn session_tx_fifo_dequeue_internal

session_tx_fifo_peek_and_snd

session_fifo_rx_fn session_tx_fifo_peek_and_snd