session.h File Reference

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Data Structures
struct	rpc_args_t

Macros
#define	HALF_OPEN_LOOKUP_INVALID_VALUE   ((u64)~0)
#define	INVALID_INDEX   ((u32)~0)
#define	SESSION_PROXY_LISTENER_INDEX   ((u32)~0 - 1)
#define	SESSION_LOCAL_HANDLE_PREFIX   0x7FFFFFFF
#define	MAX_HDRS_LEN   100 /* Max number of bytes for headers */
#define	foreach_session_input_error
#define	session_cli_return_if_not_enabled()

Typedefs
typedef u64	session_handle_t
typedef struct _session_manager_main	session_manager_main_t
typedef int(	session_fifo_rx_fn) (vlib_main_t *vm, vlib_node_runtime_t *node, session_manager_main_t *smm, session_fifo_event_t *e0, stream_session_t *s0, u32 thread_index, int *n_tx_pkts)

Enumerations
enum	fifo_event_type_t {   FIFO_EVENT_APP_RX, FIFO_EVENT_APP_TX, FIFO_EVENT_TIMEOUT, FIFO_EVENT_DISCONNECT,   FIFO_EVENT_BUILTIN_RX, FIFO_EVENT_RPC }
enum	session_error_t { SESSION_N_ERROR }

Functions
static const char *	fifo_event_type_str (fifo_event_type_t et)
typedef	CLIB_PACKED (struct{union{svm_fifo_t *fifo;session_handle_t session_handle;rpc_args_t rpc_args;};u8 event_type;u8 postponed;}) session_fifo_event_t
u8	session_node_lookup_fifo_event (svm_fifo_t *f, session_fifo_event_t *e)
static session_manager_main_t *	vnet_get_session_manager_main ()
static u8	stream_session_is_valid (u32 si, u8 thread_index)
stream_session_t *	session_alloc (u32 thread_index)
int	session_alloc_fifos (segment_manager_t *sm, stream_session_t *s)
void	session_free (stream_session_t *s)
static stream_session_t *	session_get (u32 si, u32 thread_index)
static stream_session_t *	session_get_if_valid (u64 si, u32 thread_index)
static session_handle_t	session_handle (stream_session_t *s)
static u32	session_index_from_handle (session_handle_t handle)
static u32	session_thread_from_handle (session_handle_t handle)
static void	session_parse_handle (session_handle_t handle, u32 *index, u32 *thread_index)
static stream_session_t *	session_get_from_handle (session_handle_t handle)
static stream_session_t *	session_get_from_handle_if_valid (session_handle_t handle)
static u8	session_handle_is_local (session_handle_t handle)
static transport_proto_t	session_type_transport_proto (session_type_t st)
static u8	session_type_is_ip4 (session_type_t st)
static transport_proto_t	session_get_transport_proto (stream_session_t *s)
static fib_protocol_t	session_get_fib_proto (stream_session_t *s)
static session_type_t	session_type_from_proto_and_ip (transport_proto_t proto, u8 is_ip4)
static u8	session_has_transport (stream_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 stream_session_t *	session_get_from_handle_safe (u64 handle)
	Get session from handle and 'lock' pool resize if not in same thread. More...
static stream_session_t *	stream_session_listener_get (u8 sst, u64 si)
static u32	stream_session_get_index (stream_session_t *s)
static u32	stream_session_max_rx_enqueue (transport_connection_t *tc)
static u32	stream_session_rx_fifo_size (transport_connection_t *tc)
static u32	session_get_index (stream_session_t *s)
static stream_session_t *	session_clone_safe (u32 session_index, u32 thread_index)
transport_connection_t *	session_get_transport (stream_session_t *s)
u32	stream_session_tx_fifo_max_dequeue (transport_connection_t *tc)
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, vlib_buffer_t *b, u8 proto, u8 queue_event)
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)
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, stream_session_t **new_session)
	Move dgram session to the right thread. More...
void	stream_session_init_fifos_pointers (transport_connection_t *tc, u32 rx_pointer, u32 tx_pointer)
	Init fifo tail and head pointers. 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_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 (u32 app_index, session_endpoint_t *tep, u32 opaque)
	Ask transport to open connection to remote transport endpoint. More...
int	stream_session_listen (stream_session_t *s, session_endpoint_t *tep)
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...
void	session_send_session_evt_to_thread (u64 session_handle, fifo_event_type_t evt_type, u32 thread_index)
ssvm_private_t *	session_manager_get_evt_q_segment (void)
u8 *	format_stream_session (u8 *s, va_list *args)
	Format stream session as per the following format. More...
uword	unformat_stream_session (unformat_input_t *input, va_list *args)
uword	unformat_transport_connection (unformat_input_t *input, va_list *args)
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...
clib_error_t *	vnet_session_enable_disable (vlib_main_t *vm, u8 is_en)
static svm_queue_t *	session_manager_get_vpp_event_queue (u32 thread_index)
int	session_manager_flush_enqueue_events (u8 proto, u32 thread_index)
	Flushes queue of sessions that are to be notified of new data enqueued events. More...
static u64	listen_session_get_handle (stream_session_t *s)
static stream_session_t *	listen_session_get_from_handle (session_handle_t handle)
static void	listen_session_parse_handle (session_handle_t handle, u32 *type, u32 *index)
static stream_session_t *	listen_session_new (session_type_t type)
static stream_session_t *	listen_session_get (session_type_t type, u32 index)
static void	listen_session_del (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)
static stream_session_t *	session_manager_get_listener (u8 session_type, u32 index)
static u8	session_manager_is_enabled ()
void	session_node_enable_disable (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_manager_main_t	session_manager_main
vlib_node_registration_t	session_queue_node
	(constructor) VLIB_REGISTER_NODE (session_queue_node) More...

Macro Definition Documentation

#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 65 of file session.h.

#define HALF_OPEN_LOOKUP_INVALID_VALUE   ((u64)~0)

Definition at line 25 of file session.h.

#define INVALID_INDEX   ((u32)~0)

Definition at line 26 of file session.h.

#define MAX_HDRS_LEN   100 /* Max number of bytes for headers */

Definition at line 31 of file session.h.

#define session_cli_return_if_not_enabled

(

)

Value:

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

Definition at line 591 of file session.h.

#define SESSION_LOCAL_HANDLE_PREFIX   0x7FFFFFFF

Definition at line 28 of file session.h.

#define SESSION_PROXY_LISTENER_INDEX   ((u32)~0 - 1)

Definition at line 27 of file session.h.

Typedef Documentation

typedef int( session_fifo_rx_fn) (vlib_main_t *vm, vlib_node_runtime_t *node, session_manager_main_t *smm, session_fifo_event_t *e0, stream_session_t *s0, u32 thread_index, int *n_tx_pkts)

Definition at line 110 of file session.h.

typedef u64 session_handle_t

Definition at line 91 of file session.h.

typedef struct _session_manager_main session_manager_main_t

Definition at line 107 of file session.h.

Enumeration Type Documentation

enum fifo_event_type_t

Enumerator
FIFO_EVENT_APP_RX
FIFO_EVENT_APP_TX
FIFO_EVENT_TIMEOUT
FIFO_EVENT_DISCONNECT
FIFO_EVENT_BUILTIN_RX
FIFO_EVENT_RPC

Definition at line 33 of file session.h.

enum session_error_t

Enumerator
SESSION_N_ERROR

Definition at line 77 of file session.h.

Function Documentation

typedef CLIB_PACKED

(

struct{union{svm_fifo_t *fifo;session_handle_t session_handle;rpc_args_t rpc_args;};u8 event_type;u8 postponed;}

)

static const char* fifo_event_type_str ( fifo_event_type_t  et )

inlinestatic

Definition at line 44 of file session.h.

u8* format_stream_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 52 of file session_cli.c.

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static void listen_session_del ( stream_session_t *  s )

inlinestatic

Definition at line 566 of file session.h.

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static stream_session_t* listen_session_get ( session_type_t  type, u32  index  )

inlinestatic

Definition at line 559 of file session.h.

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static stream_session_t* listen_session_get_from_handle ( session_handle_t  handle )

inlinestatic

Definition at line 520 of file session.h.

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static u64 listen_session_get_handle ( stream_session_t *  s )

inlinestatic

Definition at line 513 of file session.h.

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int listen_session_get_local_session_endpoint	(	stream_session_t *	listener,
		session_endpoint_t *	sep
	)

Definition at line 1192 of file session.c.

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transport_connection_t* listen_session_get_transport

(

stream_session_t *

s

)

Definition at line 1185 of file session.c.

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static stream_session_t* listen_session_new ( session_type_t  type )

inlinestatic

Definition at line 544 of file session.h.

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

inlinestatic

Definition at line 537 of file session.h.

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stream_session_t* session_alloc

(

u32

thread_index

)

Definition at line 80 of file session.c.

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int session_alloc_fifos	(	segment_manager_t *	sm,
		stream_session_t *	s
	)

Definition at line 115 of file session.c.

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static stream_session_t* session_clone_safe ( u32  session_index, u32  thread_index  )

inlinestatic

Definition at line 435 of file session.h.

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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 651 of file session.c.

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

Definition at line 359 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 304 of file session.c.

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void session_free

(

stream_session_t *

s

)

Definition at line 107 of file session.c.

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static stream_session_t* session_get ( u32  si, u32  thread_index  )

inlinestatic

Definition at line 241 of file session.h.

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static fib_protocol_t session_get_fib_proto ( stream_session_t *  s )

inlinestatic

Definition at line 330 of file session.h.

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static stream_session_t* session_get_from_handle ( session_handle_t  handle )

inlinestatic

Definition at line 287 of file session.h.

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static stream_session_t* session_get_from_handle_if_valid ( session_handle_t  handle )

inlinestatic

Definition at line 296 of file session.h.

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static stream_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 382 of file session.h.

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static stream_session_t* session_get_if_valid ( u64  si, u32  thread_index  )

inlinestatic

Definition at line 248 of file session.h.

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static u32 session_get_index ( stream_session_t *  s )

inlinestatic

Definition at line 429 of file session.h.

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transport_connection_t* session_get_transport

(

stream_session_t *

s

)

Definition at line 1172 of file session.c.

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static transport_proto_t session_get_transport_proto ( stream_session_t *  s )

inlinestatic

Definition at line 324 of file session.h.

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static session_handle_t session_handle ( stream_session_t *  s )

inlinestatic

Definition at line 261 of file session.h.

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static u8 session_handle_is_local ( session_handle_t  handle )

inlinestatic

Definition at line 304 of file session.h.

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static u8 session_has_transport ( stream_session_t *  s )

inlinestatic

Definition at line 343 of file session.h.

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static u32 session_index_from_handle ( session_handle_t  handle )

inlinestatic

Definition at line 267 of file session.h.

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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 510 of file session.c.

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ssvm_private_t* session_manager_get_evt_q_segment

(

void

)

Definition at line 1119 of file session.c.

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static stream_session_t* session_manager_get_listener ( u8  session_type, u32  index  )

inlinestatic

Definition at line 578 of file session.h.

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static svm_queue_t* session_manager_get_vpp_event_queue ( u32  thread_index )

inlinestatic

Definition at line 505 of file session.h.

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static u8 session_manager_is_enabled ( )

inlinestatic

Definition at line 586 of file session.h.

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void session_node_enable_disable

(

u8

is_en

)

Definition at line 1300 of file session.c.

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u8 session_node_lookup_fifo_event	(	svm_fifo_t *	f,
		session_fifo_event_t *	e
	)

Definition at line 504 of file session_node.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 912 of file session.c.

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

inlinestatic

Definition at line 279 of file session.h.

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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 359 of file session.h.

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static void session_pool_remove_peeker ( u32  thread_index )

inlinestatic

Definition at line 368 of file session.h.

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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 1142 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 59 of file session.c.

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int session_stream_connect_notify	(	transport_connection_t *	tc,
		u8	is_fail
	)

Definition at line 549 of file session.c.

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static u32 session_thread_from_handle ( session_handle_t  handle )

inlinestatic

Definition at line 273 of file session.h.

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static session_type_t session_type_from_proto_and_ip ( transport_proto_t  proto, u8  is_ip4  )

inlinestatic

Definition at line 337 of file session.h.

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static u8 session_type_is_ip4 ( session_type_t  st )

inlinestatic

Definition at line 318 of file session.h.

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static transport_proto_t session_type_transport_proto ( session_type_t  st )

inlinestatic

Definition at line 312 of file session.h.

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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 771 of file session.c.

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void stream_session_accept_notify

(

transport_connection_t *

tc

)

Definition at line 687 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, wait for a delete notify to actually remove the session state.

Definition at line 1049 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 742 of file session.c.

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u32 stream_session_dequeue_drop	(	transport_connection_t *	tc,
		u32	max_bytes
	)

Definition at line 427 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 1018 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 705 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 1035 of file session.c.

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static u32 stream_session_get_index ( stream_session_t *  s )

inlinestatic

Definition at line 406 of file session.h.

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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 539 of file session.c.

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static u8 stream_session_is_valid ( u32  si, u8  thread_index  )

inlinestatic

Definition at line 223 of file session.h.

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int stream_session_listen	(	stream_session_t *	s,
		session_endpoint_t *	tep
	)

Definition at line 977 of file session.c.

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static stream_session_t* stream_session_listener_get ( u8  sst, u64  si  )

inlinestatic

Definition at line 400 of file session.h.

static u32 stream_session_max_rx_enqueue ( transport_connection_t *  tc )

inlinestatic

Definition at line 415 of file session.h.

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

Definition at line 419 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 757 of file session.c.

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static u32 stream_session_rx_fifo_size ( transport_connection_t *  tc )

inlinestatic

Definition at line 422 of file session.h.

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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 989 of file session.c.

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u32 stream_session_tx_fifo_max_dequeue

(

transport_connection_t *

tc

)

Definition at line 410 of file session.c.

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uword unformat_stream_session	(	unformat_input_t *	input,
		va_list *	args
	)

Definition at line 133 of file session_cli.c.

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uword unformat_transport_connection	(	unformat_input_t *	input,
		va_list *	args
	)

Definition at line 164 of file session_cli.c.

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static session_manager_main_t* vnet_get_session_manager_main ( )

inlinestatic

Definition at line 217 of file session.h.

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clib_error_t* vnet_session_enable_disable	(	vlib_main_t *	vm,
		u8	is_en
	)

Definition at line 1312 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.

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 46 of file session_node.c.

session_fifo_rx_fn session_tx_fifo_dequeue_and_snd

session_fifo_rx_fn session_tx_fifo_dequeue_internal

session_fifo_rx_fn session_tx_fifo_peek_and_snd