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Vector Packet Processing
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 (session_t *s, session_evt_type_t evt_type)
 
void session_send_rpc_evt_to_thread_force (u32 thread_index, void *fp, void *rpc_args)
 
void session_send_rpc_evt_to_thread (u32 thread_index, void *fp, void *rpc_args)
 
void session_add_self_custom_tx_evt (transport_connection_t *tc, u8 has_prio)
 
static void session_program_transport_ctrl_evt (session_t *s, session_evt_type_t evt)
 
session_tsession_alloc (u32 thread_index)
 
void session_free (session_t *s)
 
u8 session_is_valid (u32 si, u8 thread_index)
 
static void session_cleanup_notify (session_t *s, session_cleanup_ntf_t ntf)
 
void session_free_w_fifos (session_t *s)
 
static void session_delete (session_t *s)
 Cleans up session and lookup table. More...
 
static session_tsession_alloc_for_connection (transport_connection_t *tc)
 
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 (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 (session_t *s, session_dgram_hdr_t *hdr, vlib_buffer_t *b, u8 proto, u8 queue_event)
 
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 int session_notify_subscribers (u32 app_index, session_t *s, svm_fifo_t *f, session_evt_type_t evt_type)
 
static int session_enqueue_notify_inline (session_t *s)
 Notify session peer that new data has been enqueued. More...
 
int session_enqueue_notify (session_t *s)
 
static void session_enqueue_notify_rpc (void *arg)
 
void session_enqueue_notify_thread (session_handle_t sh)
 Like session_enqueue_notify, but can be called from a thread that does not own the session. More...
 
int session_dequeue_notify (session_t *s)
 
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. More...
 
int session_main_flush_all_enqueue_events (u8 transport_proto)
 
static int session_stream_connect_notify_inline (transport_connection_t *tc, u8 is_fail, session_state_t opened_state)
 
int session_stream_connect_notify (transport_connection_t *tc, u8 is_fail)
 
int session_ho_stream_connect_notify (transport_connection_t *tc, u8 is_fail)
 
static void session_switch_pool (void *cb_args)
 Notify old thread of the session pool switch. More...
 
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...
 
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 it is closed. More...
 
void session_transport_reset_notify (transport_connection_t *tc)
 Notify application that connection has been reset. More...
 
int session_stream_accept_notify (transport_connection_t *tc)
 
int session_stream_accept (transport_connection_t *tc, u32 listener_index, u32 thread_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 (session_t *ls, 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_reset (session_t *s)
 Force a close without waiting for data to be flushed. More...
 
void session_transport_close (session_t *s)
 Notify transport the session can be disconnected. More...
 
void session_transport_reset (session_t *s)
 Force transport close. More...
 
void session_transport_cleanup (session_t *s)
 Cleanup transport and session state. More...
 
void session_vpp_event_queues_allocate (session_main_t *smm)
 Allocate event queues in the shared-memory segment. More...
 
ssvm_private_tsession_main_get_evt_q_segment (void)
 
u64 session_segment_handle (session_t *s)
 
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_tsession_get_transport (session_t *s)
 
void session_get_endpoint (session_t *s, transport_endpoint_t *tep, u8 is_lcl)
 
transport_connection_tlisten_session_get_transport (session_t *s)
 
void session_flush_frames_main_thread (vlib_main_t *vm)
 
static clib_error_tsession_manager_main_enable (vlib_main_t *vm)
 
void session_node_enable_disable (u8 is_en)
 
clib_error_tvnet_session_enable_disable (vlib_main_t *vm, u8 is_en)
 
clib_error_tsession_manager_main_init (vlib_main_t *vm)
 
static clib_error_tsession_main_init (vlib_main_t *vm)
 
static clib_error_tsession_config_fn (vlib_main_t *vm, unformat_input_t *input)
 

Variables

session_main_t session_main
 
static session_open_service_fn session_open_srv_fns [TRANSPORT_N_SERVICES]
 
static session_fifo_rx_fnsession_tx_fns [TRANSPORT_TX_N_FNS]
 

Detailed Description

Session and session manager.

Definition in file session.c.

Typedef Documentation

◆ session_open_service_fn

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

Definition at line 1130 of file session.c.

◆ session_switch_pool_args_t

typedef struct _session_switch_pool_args session_switch_pool_args_t

Function Documentation

◆ listen_session_get_transport()

transport_connection_t* listen_session_get_transport ( session_t s)

Definition at line 1491 of file session.c.

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◆ session_add_self_custom_tx_evt()

void session_add_self_custom_tx_evt ( transport_connection_t tc,
u8  has_prio 
)

Definition at line 123 of file session.c.

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◆ session_alloc()

session_t* session_alloc ( u32  thread_index)

Definition at line 170 of file session.c.

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◆ session_alloc_for_connection()

static session_t* session_alloc_for_connection ( transport_connection_t tc)
static

Definition at line 272 of file session.c.

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◆ session_cleanup_notify()

static void session_cleanup_notify ( session_t s,
session_cleanup_ntf_t  ntf 
)
static

Definition at line 236 of file session.c.

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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 1223 of file session.c.

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◆ session_config_fn()

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

Definition at line 1667 of file session.c.

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◆ session_delete()

static void session_delete ( session_t s)
static

Cleans up session and lookup table.

Transport connection must still be valid.

Definition at line 260 of file session.c.

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◆ session_dequeue_notify()

int session_dequeue_notify ( session_t s)

Definition at line 634 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 823 of file session.c.

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◆ session_enqueue_chain_tail()

static int session_enqueue_chain_tail ( session_t s,
vlib_buffer_t b,
u32  offset,
u8  is_in_order 
)
inlinestatic

Enqueue buffer chain tail.

Definition at line 327 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 467 of file session.c.

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◆ session_enqueue_discard_chain_bytes()

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 296 of file session.c.

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◆ session_enqueue_notify()

int session_enqueue_notify ( session_t s)

Definition at line 596 of file session.c.

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◆ session_enqueue_notify_inline()

static int session_enqueue_notify_inline ( session_t s)
inlinestatic

Notify session peer that new data has been enqueued.

Parameters
sStream session for which the event is to be generated.
lockFlag to indicate if call should lock message queue.
Returns
0 on success or negative number if failed to send notification.

Definition at line 557 of file session.c.

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◆ session_enqueue_notify_rpc()

static void session_enqueue_notify_rpc ( void *  arg)
static

Definition at line 602 of file session.c.

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◆ session_enqueue_notify_thread()

void session_enqueue_notify_thread ( session_handle_t  sh)

Like session_enqueue_notify, but can be called from a thread that does not own the session.

Definition at line 619 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 414 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 1498 of file session.c.

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◆ session_free()

void session_free ( session_t s)

Definition at line 196 of file session.c.

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◆ session_free_w_fifos()

void session_free_w_fifos ( session_t s)

Definition at line 247 of file session.c.

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◆ session_get_endpoint()

void session_get_endpoint ( session_t s,
transport_endpoint_t tep,
u8  is_lcl 
)

Definition at line 1479 of file session.c.

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◆ session_get_transport()

transport_connection_t* session_get_transport ( session_t s)

Definition at line 1468 of file session.c.

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◆ session_ho_stream_connect_notify()

int session_ho_stream_connect_notify ( transport_connection_t tc,
u8  is_fail 
)

Definition at line 772 of file session.c.

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◆ session_is_valid()

u8 session_is_valid ( u32  si,
u8  thread_index 
)

Definition at line 210 of file session.c.

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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 1170 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 693 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 664 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 1401 of file session.c.

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◆ session_main_init()

static clib_error_t* session_main_init ( vlib_main_t vm)
static

Definition at line 1651 of file session.c.

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◆ session_manager_main_enable()

static clib_error_t* session_manager_main_enable ( vlib_main_t vm)
static

Definition at line 1506 of file session.c.

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◆ session_manager_main_init()

clib_error_t* session_manager_main_init ( vlib_main_t vm)

Definition at line 1634 of file session.c.

◆ session_node_enable_disable()

void session_node_enable_disable ( u8  is_en)

Definition at line 1579 of file session.c.

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◆ session_notify_subscribers()

static int session_notify_subscribers ( u32  app_index,
session_t s,
svm_fifo_t f,
session_evt_type_t  evt_type 
)
inlinestatic

Definition at line 525 of file session.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 1154 of file session.c.

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◆ session_open_app()

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

Definition at line 1119 of file session.c.

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◆ session_open_cl()

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

Definition at line 1046 of file session.c.

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◆ session_open_vc()

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

Definition at line 1082 of file session.c.

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◆ session_program_transport_ctrl_evt()

static void session_program_transport_ctrl_evt ( session_t s,
session_evt_type_t  evt 
)
static

Definition at line 149 of file session.c.

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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 1438 of file session.c.

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◆ session_reset()

void session_reset ( session_t s)

Force a close without waiting for data to be flushed.

Definition at line 1246 of file session.c.

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◆ session_segment_handle()

u64 session_segment_handle ( session_t s)

Definition at line 1410 of file session.c.

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◆ session_send_ctrl_evt_to_thread()

int session_send_ctrl_evt_to_thread ( session_t s,
session_evt_type_t  evt_type 
)

Definition at line 94 of file session.c.

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◆ session_send_evt_to_thread()

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

Definition at line 29 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 80 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 87 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 111 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 103 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 1198 of file session.c.

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◆ session_stream_accept()

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

Accept a stream session.

Optionally ping the server by callback.

Definition at line 1020 of file session.c.

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◆ session_stream_accept_notify()

int session_stream_accept_notify ( transport_connection_t tc)

Definition at line 1003 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 765 of file session.c.

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◆ session_stream_connect_notify_inline()

static int session_stream_connect_notify_inline ( transport_connection_t tc,
u8  is_fail,
session_state_t  opened_state 
)
inlinestatic

Definition at line 703 of file session.c.

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◆ session_switch_pool()

static void session_switch_pool ( void *  cb_args)
static

Notify old thread of the session pool switch.

Definition at line 790 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 1316 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 1264 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 it is closed.

Should be called by transport, prior to calling delete notify, once it knows that no more data will be exchanged. This could serve as an early acknowledgment of an active close especially if transport delete can be delayed a long time, e.g., tcp time-wait.

Definition at line 953 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 865 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 887 of file session.c.

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◆ session_transport_reset()

void session_transport_reset ( session_t s)

Force transport close.

Definition at line 1292 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 988 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 511 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 503 of file session.c.

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◆ session_vpp_event_queues_allocate()

void session_vpp_event_queues_allocate ( session_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 1338 of file session.c.

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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 1613 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_open_srv_fns

session_open_service_fn session_open_srv_fns[TRANSPORT_N_SERVICES]
static
Initial value:
= {
}
int session_open_vc(u32 app_wrk_index, session_endpoint_t *rmt, u32 opaque)
Definition: session.c:1082
int session_open_cl(u32 app_wrk_index, session_endpoint_t *rmt, u32 opaque)
Definition: session.c:1046
int session_open_app(u32 app_wrk_index, session_endpoint_t *rmt, u32 opaque)
Definition: session.c:1119

Definition at line 1133 of file session.c.

◆ session_tx_fns

session_fifo_rx_fn* session_tx_fns[TRANSPORT_TX_N_FNS]
static
Initial value:
= {
session_tx_fifo_dequeue_and_snd
}
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

Definition at line 1423 of file session.c.