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Vector Packet Processing
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_tsession_alloc (u32 thread_index)
 
void session_free (session_t *s)
 
void session_free_w_fifos (session_t *s)
 
static session_tsession_get (u32 si, u32 thread_index)
 
static session_tsession_get_if_valid (u64 si, u32 thread_index)
 
static session_tsession_get_from_handle (session_handle_t handle)
 
static session_tsession_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_tsession_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_tsession_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_tsession_get_transport (session_t *s)
 
u8format_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_tlisten_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_tlisten_session_alloc (u8 thread_index, session_type_t type)
 
static session_tlisten_session_get (u32 ls_index)
 
static void listen_session_free (session_t *s)
 
transport_connection_tlisten_session_get_transport (session_t *s)
 
static session_main_tvnet_get_session_main ()
 
static session_worker_tsession_main_get_worker (u32 thread_index)
 
static svm_msg_q_tsession_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_tsession_main_get_evt_q_segment (void)
 
void session_node_enable_disable (u8 is_en)
 
clib_error_tvnet_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 { \
return clib_error_return(0, "session layer is not enabled"); \
} while (0)
#define clib_error_return(e, args...)
Definition: error.h:99
u8 is_enabled
Session manager is enabled.
Definition: session.h:143
session_main_t session_main
Definition: session.c:26

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

◆ session_worker_t

Enumeration Type Documentation

◆ 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
sSession for which listen will be called. Note that unlike established sessions, listen sessions are not associated to a thread.
sepLocal 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_indexThread 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_indexIndex of the application requesting the connect
stSession type requested.
tepRemote transport endpoint
opaqueOpaque 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
sSession 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,
.error_strings = session_queue_error_strings,
.state = VLIB_NODE_STATE_DISABLED,
}
static uword session_queue_node_fn(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Definition: session_node.c:847
static char * session_queue_error_strings[]
Definition: session_node.c:328
#define ARRAY_LEN(x)
Definition: clib.h:62
static u8 * format_session_queue_trace(u8 *s, va_list *args)
Definition: session_node.c:304

(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