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Vector Packet Processing
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 MAX_HDRS_LEN   100 /* Max number of bytes for headers */
 
#define foreach_session_input_error
 
#define session_cli_return_if_not_enabled()
 

Typedefs

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;u64 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_tvnet_get_session_manager_main ()
 
static u8 stream_session_is_valid (u32 si, u8 thread_index)
 
stream_session_tsession_alloc (u32 thread_index)
 
static stream_session_tsession_get (u32 si, u32 thread_index)
 
static stream_session_tsession_get_if_valid (u64 si, u32 thread_index)
 
static u64 session_handle (stream_session_t *s)
 
static u32 session_index_from_handle (u64 handle)
 
static u32 session_thread_from_handle (u64 handle)
 
static void session_parse_handle (u64 handle, u32 *index, u32 *thread_index)
 
static stream_session_tsession_get_from_handle (u64 handle)
 
static transport_proto_t session_get_transport_proto (stream_session_t *s)
 
static session_type_t session_type_from_proto_and_ip (transport_proto_t proto, u8 is_ip4)
 
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_tsession_get_from_handle_safe (u64 handle)
 Get session from handle and 'lock' pool resize if not in same thread. More...
 
static stream_session_tstream_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_tsession_clone_safe (u32 session_index, u32 thread_index)
 
transport_connection_tsession_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)
 Ask transport to listen on local transport endpoint. More...
 
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)
 Disconnect session and propagate to transport. 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)
 
u8format_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_tvnet_session_enable_disable (vlib_main_t *vm, u8 is_en)
 
static unix_shared_memory_queue_tsession_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_tlisten_session_get_from_handle (u64 handle)
 
static stream_session_tlisten_session_new (session_type_t type)
 
static stream_session_tlisten_session_get (session_type_t type, u32 index)
 
static void listen_session_del (stream_session_t *s)
 
transport_connection_tlisten_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_tsession_manager_get_listener (u8 session_type, u32 index)
 
static void session_manager_set_transport_rx_fn (session_type_t type, u8 is_peek)
 Set peek or dequeue function for given session type. More...
 
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_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")

Definition at line 64 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 30 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)
#define clib_error_return(e, args...)
Definition: error.h:99
session_manager_main_t session_manager_main
Definition: session.c:27

Definition at line 550 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 106 of file session.h.

typedef struct _session_manager_main session_manager_main_t

Definition at line 103 of file session.h.

Enumeration Type Documentation

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 32 of file session.h.

Enumerator
SESSION_N_ERROR 

Definition at line 75 of file session.h.

Function Documentation

typedef CLIB_PACKED ( struct{union{svm_fifo_t *fifo;u64 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 43 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 513 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 506 of file session.h.

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static stream_session_t* listen_session_get_from_handle ( u64  handle)
inlinestatic

Definition at line 474 of file session.h.

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static u64 listen_session_get_handle ( stream_session_t s)
inlinestatic

Definition at line 467 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 1046 of file session.c.

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transport_connection_t* listen_session_get_transport ( stream_session_t s)

Definition at line 1039 of file session.c.

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static stream_session_t* listen_session_new ( session_type_t  type)
inlinestatic

Definition at line 491 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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static stream_session_t* session_clone_safe ( u32  session_index,
u32  thread_index 
)
inlinestatic

Definition at line 390 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 641 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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static stream_session_t* session_get ( u32  si,
u32  thread_index 
)
inlinestatic

Definition at line 229 of file session.h.

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static stream_session_t* session_get_from_handle ( u64  handle)
inlinestatic

Definition at line 274 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 337 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 236 of file session.h.

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static u32 session_get_index ( stream_session_t s)
inlinestatic

Definition at line 384 of file session.h.

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transport_connection_t* session_get_transport ( stream_session_t s)

Definition at line 1026 of file session.c.

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static transport_proto_t session_get_transport_proto ( stream_session_t s)
inlinestatic

Definition at line 283 of file session.h.

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static u64 session_handle ( stream_session_t s)
inlinestatic

Definition at line 249 of file session.h.

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static u32 session_index_from_handle ( u64  handle)
inlinestatic

Definition at line 255 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_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 510 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 525 of file session.h.

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static unix_shared_memory_queue_t* session_manager_get_vpp_event_queue ( u32  thread_index)
inlinestatic

Definition at line 459 of file session.h.

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static u8 session_manager_is_enabled ( )
inlinestatic

Definition at line 545 of file session.h.

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static void session_manager_set_transport_rx_fn ( session_type_t  type,
u8  is_peek 
)
inlinestatic

Set peek or dequeue function for given session type.

Reliable transport protocols will probably want to use a peek function

Definition at line 538 of file session.h.

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void session_node_enable_disable ( u8  is_en)

Definition at line 1159 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 486 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_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 807 of file session.c.

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static void session_parse_handle ( u64  handle,
u32 index,
u32 thread_index 
)
inlinestatic

Definition at line 267 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 305 of file session.h.

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static void session_pool_remove_peeker ( u32  thread_index)
inlinestatic

Definition at line 318 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 999 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 ( u64  handle)
inlinestatic

Definition at line 261 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 289 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 761 of file session.c.

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void stream_session_accept_notify ( transport_connection_t tc)

Definition at line 677 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 948 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 732 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)

Disconnect session and propagate to transport.

This should eventually result in a delete notification that allows us to cleanup session state. Called for both active/passive disconnects.

Should be called from the session's thread.

Definition at line 934 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 695 of file session.c.

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static u32 stream_session_get_index ( stream_session_t s)
inlinestatic

Definition at line 361 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 213 of file session.h.

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int stream_session_listen ( stream_session_t s,
session_endpoint_t sep 
)

Ask transport to listen on local transport endpoint.

Parameters
sSession for which listen will be called. Note that unlike established sessions, listen sessions are not associated to a thread.
tepLocal endpoint to be listened on.

Definition at line 872 of file session.c.

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static stream_session_t* stream_session_listener_get ( u8  sst,
u64  si 
)
inlinestatic

Definition at line 355 of file session.h.

static u32 stream_session_max_rx_enqueue ( transport_connection_t tc)
inlinestatic

Definition at line 370 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 747 of file session.c.

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static u32 stream_session_rx_fifo_size ( transport_connection_t tc)
inlinestatic

Definition at line 377 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
sSession to stop listening on. It must be in state LISTENING.

Definition at line 904 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 207 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 1171 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,
.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:529
static char * session_queue_error_strings[]
Definition: session_node.c:61
#define ARRAY_LEN(x)
Definition: clib.h:59
static u8 * format_session_queue_trace(u8 *s, va_list *args)
Definition: session_node.c:35

(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_peek_and_snd