2 * Copyright (c) 2017 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
15 #ifndef __included_session_h__
16 #define __included_session_h__
18 #include <vnet/session/stream_session.h>
19 #include <vnet/session/session_lookup.h>
20 #include <vnet/session/transport_interface.h>
21 #include <vnet/session/session_debug.h>
22 #include <vnet/session/segment_manager.h>
23 #include <svm/queue.h>
25 #define HALF_OPEN_LOOKUP_INVALID_VALUE ((u64)~0)
26 #define INVALID_INDEX ((u32)~0)
27 #define SESSION_PROXY_LISTENER_INDEX ((u32)~0 - 1)
28 #define SESSION_LOCAL_HANDLE_PREFIX 0x7FFFFFFF
30 /* TODO decide how much since we have pre-data as well */
31 #define MAX_HDRS_LEN 100 /* Max number of bytes for headers */
38 FIFO_EVENT_DISCONNECT,
39 FIFO_EVENT_BUILTIN_RX,
43 static inline const char *
44 fifo_event_type_str (session_evt_type_t et)
48 case FIFO_EVENT_APP_RX:
49 return "FIFO_EVENT_APP_RX";
50 case FIFO_EVENT_APP_TX:
51 return "FIFO_EVENT_APP_TX";
52 case FIFO_EVENT_TIMEOUT:
53 return "FIFO_EVENT_TIMEOUT";
54 case FIFO_EVENT_DISCONNECT:
55 return "FIFO_EVENT_DISCONNECT";
56 case FIFO_EVENT_BUILTIN_RX:
57 return "FIFO_EVENT_BUILTIN_RX";
59 return "FIFO_EVENT_RPC";
61 return "UNKNOWN FIFO EVENT";
67 SESSION_MQ_IO_EVT_RING,
68 SESSION_MQ_CTRL_EVT_RING,
72 #define foreach_session_input_error \
73 _(NO_SESSION, "No session drops") \
74 _(NO_LISTENER, "No listener for dst port drops") \
75 _(ENQUEUED, "Packets pushed into rx fifo") \
76 _(NOT_READY, "Session not ready packets") \
77 _(FIFO_FULL, "Packets dropped for lack of rx fifo space") \
78 _(EVENT_FIFO_FULL, "Events not sent for lack of event fifo space") \
79 _(API_QUEUE_FULL, "Sessions not created for lack of API queue space") \
80 _(NEW_SEG_NO_SPACE, "Created segment, couldn't allocate a fifo pair") \
81 _(NO_SPACE, "Couldn't allocate a fifo pair") \
82 _(SEG_CREATE, "Couldn't create a new segment")
86 #define _(sym,str) SESSION_ERROR_##sym,
87 foreach_session_input_error
98 typedef u64 session_handle_t;
108 session_handle_t session_handle;
109 session_rpc_args_t rpc_args;
115 } __clib_packed session_fifo_event_t;
118 #define SESSION_MSG_NULL { }
120 typedef struct session_dgram_pre_hdr_
124 } session_dgram_pre_hdr_t;
127 typedef CLIB_PACKED (struct session_dgram_header_
131 ip46_address_t rmt_ip;
132 ip46_address_t lcl_ip;
136 }) session_dgram_hdr_t;
139 #define SESSION_CONN_ID_LEN 37
140 #define SESSION_CONN_HDR_LEN 45
142 STATIC_ASSERT (sizeof (session_dgram_hdr_t) == (SESSION_CONN_ID_LEN + 8),
143 "session conn id wrong length");
145 typedef struct session_tx_context_
147 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
149 transport_proto_vft_t *transport_vft;
150 transport_connection_t *tc;
157 u16 deq_per_first_buf;
162 CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
163 session_dgram_hdr_t hdr;
164 } session_tx_context_t;
166 /* Forward definition */
167 typedef struct _session_manager_main session_manager_main_t;
170 (session_fifo_rx_fn) (vlib_main_t * vm, vlib_node_runtime_t * node,
171 session_fifo_event_t * e0, stream_session_t * s0,
174 extern session_fifo_rx_fn session_tx_fifo_peek_and_snd;
175 extern session_fifo_rx_fn session_tx_fifo_dequeue_and_snd;
176 extern session_fifo_rx_fn session_tx_fifo_dequeue_internal;
178 u8 session_node_lookup_fifo_event (svm_fifo_t * f, session_fifo_event_t * e);
180 struct _session_manager_main
182 /** Per worker thread session pools */
183 stream_session_t **sessions;
185 /** Per worker-thread session pool peekers rw locks */
186 clib_rwlock_t *peekers_rw_locks;
188 /** Per-proto, per-worker enqueue epoch counters */
189 u32 *current_enqueue_epoch[TRANSPORT_N_PROTO];
191 /** Per-proto, per-worker thread vector of sessions to enqueue */
192 u32 **session_to_enqueue[TRANSPORT_N_PROTO];
194 /** per-worker tx buffer free lists */
197 /** Per worker-thread vector of partially read events */
198 session_fifo_event_t **free_event_vector;
200 /** per-worker active event vectors */
201 session_fifo_event_t **pending_event_vector;
203 /** per-worker postponed disconnects */
204 session_fifo_event_t **pending_disconnects;
206 /** per-worker session context */
207 session_tx_context_t *ctx;
209 /** vpp fifo event queue */
210 svm_msg_q_t **vpp_event_queues;
212 /** Event queues memfd segment initialized only if so configured */
213 ssvm_private_t evt_qs_segment;
215 /** Unique segment name counter */
216 u32 unique_segment_name_counter;
218 /** Per transport rx function that can either dequeue or peek */
219 session_fifo_rx_fn **session_tx_fns;
221 /** Per session type output nodes. Could optimize to group nodes by
222 * fib but lookup would then require session type parsing in session node.
223 * Trade memory for speed, for now */
224 u32 *session_type_to_next;
226 /** Session manager is enabled */
229 /** vpp fifo event queue configured length */
230 u32 configured_event_queue_length;
236 /** Session ssvm segment configs*/
237 uword session_baseva;
238 uword session_va_space_size;
239 u32 evt_qs_segment_size;
240 u8 evt_qs_use_memfd_seg;
242 /** Session table size parameters */
243 u32 configured_v4_session_table_buckets;
244 u32 configured_v4_session_table_memory;
245 u32 configured_v4_halfopen_table_buckets;
246 u32 configured_v4_halfopen_table_memory;
247 u32 configured_v6_session_table_buckets;
248 u32 configured_v6_session_table_memory;
249 u32 configured_v6_halfopen_table_buckets;
250 u32 configured_v6_halfopen_table_memory;
252 /** Transport table (preallocation) size parameters */
253 u32 local_endpoints_table_memory;
254 u32 local_endpoints_table_buckets;
256 /** Preallocate session config parameter */
257 u32 preallocated_sessions;
261 * last event poll time by thread
262 * Debug only. Will cause false cache-line sharing as-is
264 f64 *last_event_poll_by_thread;
269 extern session_manager_main_t session_manager_main;
270 extern vlib_node_registration_t session_queue_node;
271 extern vlib_node_registration_t session_queue_process_node;
273 #define SESSION_Q_PROCESS_FLUSH_FRAMES 1
274 #define SESSION_Q_PROCESS_STOP 2
277 * Session manager function
279 always_inline session_manager_main_t *
280 vnet_get_session_manager_main ()
282 return &session_manager_main;
286 stream_session_is_valid (u32 si, u8 thread_index)
289 s = pool_elt_at_index (session_manager_main.sessions[thread_index], si);
290 if (s->thread_index != thread_index || s->session_index != si
291 /* || s->server_rx_fifo->master_session_index != si
292 || s->server_tx_fifo->master_session_index != si
293 || s->server_rx_fifo->master_thread_index != thread_index
294 || s->server_tx_fifo->master_thread_index != thread_index */ )
299 stream_session_t *session_alloc (u32 thread_index);
300 int session_alloc_fifos (segment_manager_t * sm, stream_session_t * s);
301 void session_free (stream_session_t * s);
303 always_inline stream_session_t *
304 session_get (u32 si, u32 thread_index)
306 ASSERT (stream_session_is_valid (si, thread_index));
307 return pool_elt_at_index (session_manager_main.sessions[thread_index], si);
310 always_inline stream_session_t *
311 session_get_if_valid (u64 si, u32 thread_index)
313 if (thread_index >= vec_len (session_manager_main.sessions))
316 if (pool_is_free_index (session_manager_main.sessions[thread_index], si))
319 ASSERT (stream_session_is_valid (si, thread_index));
320 return pool_elt_at_index (session_manager_main.sessions[thread_index], si);
323 always_inline session_handle_t
324 session_handle (stream_session_t * s)
326 return ((u64) s->thread_index << 32) | (u64) s->session_index;
330 session_index_from_handle (session_handle_t handle)
332 return handle & 0xFFFFFFFF;
336 session_thread_from_handle (session_handle_t handle)
342 session_parse_handle (session_handle_t handle, u32 * index,
345 *index = session_index_from_handle (handle);
346 *thread_index = session_thread_from_handle (handle);
349 always_inline stream_session_t *
350 session_get_from_handle (session_handle_t handle)
352 session_manager_main_t *smm = &session_manager_main;
353 u32 session_index, thread_index;
354 session_parse_handle (handle, &session_index, &thread_index);
355 return pool_elt_at_index (smm->sessions[thread_index], session_index);
358 always_inline stream_session_t *
359 session_get_from_handle_if_valid (session_handle_t handle)
361 u32 session_index, thread_index;
362 session_parse_handle (handle, &session_index, &thread_index);
363 return session_get_if_valid (session_index, thread_index);
367 session_handle_is_local (session_handle_t handle)
369 if ((handle >> 32) == SESSION_LOCAL_HANDLE_PREFIX)
374 always_inline transport_proto_t
375 session_type_transport_proto (session_type_t st)
381 session_type_is_ip4 (session_type_t st)
386 always_inline transport_proto_t
387 session_get_transport_proto (stream_session_t * s)
389 return (s->session_type >> 1);
392 always_inline fib_protocol_t
393 session_get_fib_proto (stream_session_t * s)
395 u8 is_ip4 = s->session_type & 1;
396 return (is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6);
399 always_inline session_type_t
400 session_type_from_proto_and_ip (transport_proto_t proto, u8 is_ip4)
402 return (proto << 1 | is_ip4);
406 session_has_transport (stream_session_t * s)
408 return (session_get_transport_proto (s) != TRANSPORT_PROTO_NONE);
411 transport_service_type_t session_transport_service_type (stream_session_t *);
412 transport_tx_fn_type_t session_transport_tx_fn_type (stream_session_t *);
413 u8 session_tx_is_dgram (stream_session_t * s);
416 * Acquires a lock that blocks a session pool from expanding.
418 * This is typically used for safely peeking into other threads'
419 * pools in order to clone elements. Lock should be dropped as soon
420 * as possible by calling @ref session_pool_remove_peeker.
422 * NOTE: Avoid using pool_elt_at_index while the lock is held because
423 * it may lead to free elt bitmap expansion/contraction!
426 session_pool_add_peeker (u32 thread_index)
428 session_manager_main_t *smm = &session_manager_main;
429 if (thread_index == vlib_get_thread_index ())
431 clib_rwlock_reader_lock (&smm->peekers_rw_locks[thread_index]);
435 session_pool_remove_peeker (u32 thread_index)
437 session_manager_main_t *smm = &session_manager_main;
438 if (thread_index == vlib_get_thread_index ())
440 clib_rwlock_reader_unlock (&smm->peekers_rw_locks[thread_index]);
444 * Get session from handle and 'lock' pool resize if not in same thread
446 * Caller should drop the peek 'lock' as soon as possible.
448 always_inline stream_session_t *
449 session_get_from_handle_safe (u64 handle)
451 session_manager_main_t *smm = &session_manager_main;
452 u32 thread_index = session_thread_from_handle (handle);
453 if (thread_index == vlib_get_thread_index ())
455 return pool_elt_at_index (smm->sessions[thread_index],
456 session_index_from_handle (handle));
460 session_pool_add_peeker (thread_index);
461 /* Don't use pool_elt_at index. See @ref session_pool_add_peeker */
462 return smm->sessions[thread_index] + session_index_from_handle (handle);
467 transport_max_rx_enqueue (transport_connection_t * tc)
469 stream_session_t *s = session_get (tc->s_index, tc->thread_index);
470 return svm_fifo_max_enqueue (s->server_rx_fifo);
474 transport_rx_fifo_size (transport_connection_t * tc)
476 stream_session_t *s = session_get (tc->s_index, tc->thread_index);
477 return s->server_rx_fifo->nitems;
481 transport_tx_fifo_size (transport_connection_t * tc)
483 stream_session_t *s = session_get (tc->s_index, tc->thread_index);
484 return s->server_tx_fifo->nitems;
488 session_get_index (stream_session_t * s)
490 return (s - session_manager_main.sessions[s->thread_index]);
493 always_inline stream_session_t *
494 session_clone_safe (u32 session_index, u32 thread_index)
496 stream_session_t *old_s, *new_s;
497 u32 current_thread_index = vlib_get_thread_index ();
499 /* If during the memcpy pool is reallocated AND the memory allocator
500 * decides to give the old chunk of memory to somebody in a hurry to
501 * scribble something on it, we have a problem. So add this thread as
502 * a session pool peeker.
504 session_pool_add_peeker (thread_index);
505 new_s = session_alloc (current_thread_index);
506 old_s = session_manager_main.sessions[thread_index] + session_index;
507 clib_memcpy (new_s, old_s, sizeof (*new_s));
508 session_pool_remove_peeker (thread_index);
509 new_s->thread_index = current_thread_index;
510 new_s->session_index = session_get_index (new_s);
514 transport_connection_t *session_get_transport (stream_session_t * s);
516 u32 session_tx_fifo_max_dequeue (transport_connection_t * tc);
519 session_enqueue_stream_connection (transport_connection_t * tc,
520 vlib_buffer_t * b, u32 offset,
521 u8 queue_event, u8 is_in_order);
522 int session_enqueue_dgram_connection (stream_session_t * s,
523 session_dgram_hdr_t * hdr,
524 vlib_buffer_t * b, u8 proto,
526 int stream_session_peek_bytes (transport_connection_t * tc, u8 * buffer,
527 u32 offset, u32 max_bytes);
528 u32 stream_session_dequeue_drop (transport_connection_t * tc, u32 max_bytes);
530 int session_stream_connect_notify (transport_connection_t * tc, u8 is_fail);
531 int session_dgram_connect_notify (transport_connection_t * tc,
532 u32 old_thread_index,
533 stream_session_t ** new_session);
534 int session_dequeue_notify (stream_session_t * s);
535 void stream_session_init_fifos_pointers (transport_connection_t * tc,
536 u32 rx_pointer, u32 tx_pointer);
538 void stream_session_accept_notify (transport_connection_t * tc);
539 void stream_session_disconnect_notify (transport_connection_t * tc);
540 void stream_session_delete_notify (transport_connection_t * tc);
541 void stream_session_reset_notify (transport_connection_t * tc);
542 int stream_session_accept (transport_connection_t * tc, u32 listener_index,
544 int session_open (u32 app_index, session_endpoint_t * tep, u32 opaque);
545 int stream_session_listen (stream_session_t * s, session_endpoint_t * tep);
546 int stream_session_stop_listen (stream_session_t * s);
547 void stream_session_disconnect (stream_session_t * s);
548 void stream_session_disconnect_transport (stream_session_t * s);
549 void stream_session_cleanup (stream_session_t * s);
550 int session_send_io_evt_to_thread (svm_fifo_t * f,
551 session_evt_type_t evt_type);
552 int session_send_io_evt_to_thread_custom (svm_fifo_t * f, u32 thread_index,
553 session_evt_type_t evt_type);
554 void session_send_rpc_evt_to_thread (u32 thread_index, void *fp,
556 ssvm_private_t *session_manager_get_evt_q_segment (void);
558 u8 *format_stream_session (u8 * s, va_list * args);
559 uword unformat_stream_session (unformat_input_t * input, va_list * args);
560 uword unformat_transport_connection (unformat_input_t * input,
563 void session_register_transport (transport_proto_t transport_proto,
564 const transport_proto_vft_t * vft, u8 is_ip4,
567 clib_error_t *vnet_session_enable_disable (vlib_main_t * vm, u8 is_en);
569 always_inline svm_msg_q_t *
570 session_manager_get_vpp_event_queue (u32 thread_index)
572 return session_manager_main.vpp_event_queues[thread_index];
575 int session_manager_flush_enqueue_events (u8 proto, u32 thread_index);
576 int session_manager_flush_all_enqueue_events (u8 transport_proto);
579 listen_session_get_handle (stream_session_t * s)
581 ASSERT (s->session_state == SESSION_STATE_LISTENING);
582 return session_handle (s);
585 always_inline stream_session_t *
586 listen_session_get_from_handle (session_handle_t handle)
588 return session_get_from_handle (handle);
592 listen_session_parse_handle (session_handle_t handle, u32 * index,
595 session_parse_handle (handle, index, thread_index);
598 always_inline stream_session_t *
599 listen_session_new (u8 thread_index, session_type_t type)
602 s = session_alloc (thread_index);
603 s->session_type = type;
604 s->session_state = SESSION_STATE_LISTENING;
608 always_inline stream_session_t *
609 listen_session_get (u32 index)
611 return session_get (index, 0);
615 listen_session_del (stream_session_t * s)
620 transport_connection_t *listen_session_get_transport (stream_session_t * s);
623 listen_session_get_local_session_endpoint (stream_session_t * listener,
624 session_endpoint_t * sep);
626 void session_flush_frames_main_thread (vlib_main_t * vm);
629 session_manager_is_enabled ()
631 return session_manager_main.is_enabled == 1;
634 #define session_cli_return_if_not_enabled() \
636 if (!session_manager_main.is_enabled) \
637 return clib_error_return(0, "session layer is not enabled"); \
640 void session_node_enable_disable (u8 is_en);
642 #endif /* __included_session_h__ */
645 * fd.io coding-style-patch-verification: ON
648 * eval: (c-set-style "gnu")