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 ((u8)~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 */
39 FIFO_EVENT_DISCONNECT,
40 FIFO_EVENT_BUILTIN_RX,
41 FIFO_EVENT_BUILTIN_TX,
43 SESSION_CTRL_EVT_BOUND,
44 SESSION_CTRL_EVT_ACCEPTED,
45 SESSION_CTRL_EVT_ACCEPTED_REPLY,
46 SESSION_CTRL_EVT_CONNECTED,
47 SESSION_CTRL_EVT_CONNECTED_REPLY,
48 SESSION_CTRL_EVT_DISCONNECTED,
49 SESSION_CTRL_EVT_DISCONNECTED_REPLY,
50 SESSION_CTRL_EVT_RESET,
51 SESSION_CTRL_EVT_RESET_REPLY
54 static inline const char *
55 fifo_event_type_str (session_evt_type_t et)
59 case FIFO_EVENT_APP_RX:
60 return "FIFO_EVENT_APP_RX";
61 case FIFO_EVENT_APP_TX:
62 return "FIFO_EVENT_APP_TX";
63 case FIFO_EVENT_DISCONNECT:
64 return "FIFO_EVENT_DISCONNECT";
65 case FIFO_EVENT_BUILTIN_RX:
66 return "FIFO_EVENT_BUILTIN_RX";
68 return "FIFO_EVENT_RPC";
70 return "UNKNOWN FIFO EVENT";
76 SESSION_MQ_IO_EVT_RING,
77 SESSION_MQ_CTRL_EVT_RING,
81 #define foreach_session_input_error \
82 _(NO_SESSION, "No session drops") \
83 _(NO_LISTENER, "No listener for dst port drops") \
84 _(ENQUEUED, "Packets pushed into rx fifo") \
85 _(NOT_READY, "Session not ready packets") \
86 _(FIFO_FULL, "Packets dropped for lack of rx fifo space") \
87 _(EVENT_FIFO_FULL, "Events not sent for lack of event fifo space") \
88 _(API_QUEUE_FULL, "Sessions not created for lack of API queue space") \
89 _(NEW_SEG_NO_SPACE, "Created segment, couldn't allocate a fifo pair") \
90 _(NO_SPACE, "Couldn't allocate a fifo pair") \
91 _(SEG_CREATE, "Couldn't create a new segment")
95 #define _(sym,str) SESSION_ERROR_##sym,
96 foreach_session_input_error
105 } session_rpc_args_t;
107 typedef u64 session_handle_t;
117 session_handle_t session_handle;
118 session_rpc_args_t rpc_args;
124 } __clib_packed session_event_t;
127 #define SESSION_MSG_NULL { }
129 typedef struct session_dgram_pre_hdr_
133 } session_dgram_pre_hdr_t;
136 typedef CLIB_PACKED (struct session_dgram_header_
140 ip46_address_t rmt_ip;
141 ip46_address_t lcl_ip;
145 }) session_dgram_hdr_t;
148 #define SESSION_CONN_ID_LEN 37
149 #define SESSION_CONN_HDR_LEN 45
151 STATIC_ASSERT (sizeof (session_dgram_hdr_t) == (SESSION_CONN_ID_LEN + 8),
152 "session conn id wrong length");
154 typedef struct session_tx_context_
156 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
158 transport_proto_vft_t *transport_vft;
159 transport_connection_t *tc;
166 u16 deq_per_first_buf;
171 CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
172 session_dgram_hdr_t hdr;
173 } session_tx_context_t;
175 /* Forward definition */
176 typedef struct _session_manager_main session_manager_main_t;
179 (session_fifo_rx_fn) (vlib_main_t * vm, vlib_node_runtime_t * node,
180 session_event_t * e0, stream_session_t * s0,
183 extern session_fifo_rx_fn session_tx_fifo_peek_and_snd;
184 extern session_fifo_rx_fn session_tx_fifo_dequeue_and_snd;
185 extern session_fifo_rx_fn session_tx_fifo_dequeue_internal;
187 u8 session_node_lookup_fifo_event (svm_fifo_t * f, session_event_t * e);
189 struct _session_manager_main
191 /** Per worker thread session pools */
192 stream_session_t **sessions;
194 /** Per worker-thread session pool peekers rw locks */
195 clib_rwlock_t *peekers_rw_locks;
197 /** Per-proto, per-worker enqueue epoch counters */
198 u32 *current_enqueue_epoch[TRANSPORT_N_PROTO];
200 /** Per-proto, per-worker thread vector of sessions to enqueue */
201 u32 **session_to_enqueue[TRANSPORT_N_PROTO];
203 /** per-worker tx buffer free lists */
206 /** Per worker-thread vector of partially read events */
207 session_event_t **free_event_vector;
209 /** per-worker active event vectors */
210 session_event_t **pending_event_vector;
212 /** per-worker postponed disconnects */
213 session_event_t **pending_disconnects;
215 /** per-worker session context */
216 session_tx_context_t *ctx;
218 /** vpp fifo event queue */
219 svm_msg_q_t **vpp_event_queues;
221 /** Event queues memfd segment initialized only if so configured */
222 ssvm_private_t evt_qs_segment;
224 /** Unique segment name counter */
225 u32 unique_segment_name_counter;
227 /** Per transport rx function that can either dequeue or peek */
228 session_fifo_rx_fn **session_tx_fns;
230 /** Per session type output nodes. Could optimize to group nodes by
231 * fib but lookup would then require session type parsing in session node.
232 * Trade memory for speed, for now */
233 u32 *session_type_to_next;
235 /** Session manager is enabled */
238 /** vpp fifo event queue configured length */
239 u32 configured_event_queue_length;
245 /** Session ssvm segment configs*/
246 uword session_baseva;
247 uword session_va_space_size;
248 u32 evt_qs_segment_size;
249 u8 evt_qs_use_memfd_seg;
251 /** Session table size parameters */
252 u32 configured_v4_session_table_buckets;
253 u32 configured_v4_session_table_memory;
254 u32 configured_v4_halfopen_table_buckets;
255 u32 configured_v4_halfopen_table_memory;
256 u32 configured_v6_session_table_buckets;
257 u32 configured_v6_session_table_memory;
258 u32 configured_v6_halfopen_table_buckets;
259 u32 configured_v6_halfopen_table_memory;
261 /** Transport table (preallocation) size parameters */
262 u32 local_endpoints_table_memory;
263 u32 local_endpoints_table_buckets;
265 /** Preallocate session config parameter */
266 u32 preallocated_sessions;
270 * last event poll time by thread
271 * Debug only. Will cause false cache-line sharing as-is
273 f64 *last_event_poll_by_thread;
278 extern session_manager_main_t session_manager_main;
279 extern vlib_node_registration_t session_queue_node;
280 extern vlib_node_registration_t session_queue_process_node;
282 #define SESSION_Q_PROCESS_FLUSH_FRAMES 1
283 #define SESSION_Q_PROCESS_STOP 2
286 * Session manager function
288 always_inline session_manager_main_t *
289 vnet_get_session_manager_main ()
291 return &session_manager_main;
295 stream_session_is_valid (u32 si, u8 thread_index)
298 s = pool_elt_at_index (session_manager_main.sessions[thread_index], si);
299 if (s->thread_index != thread_index || s->session_index != si
300 /* || s->server_rx_fifo->master_session_index != si
301 || s->server_tx_fifo->master_session_index != si
302 || s->server_rx_fifo->master_thread_index != thread_index
303 || s->server_tx_fifo->master_thread_index != thread_index */ )
308 stream_session_t *session_alloc (u32 thread_index);
309 int session_alloc_fifos (segment_manager_t * sm, stream_session_t * s);
310 void session_free (stream_session_t * s);
312 always_inline stream_session_t *
313 session_get (u32 si, u32 thread_index)
315 ASSERT (stream_session_is_valid (si, thread_index));
316 return pool_elt_at_index (session_manager_main.sessions[thread_index], si);
319 always_inline stream_session_t *
320 session_get_if_valid (u64 si, u32 thread_index)
322 if (thread_index >= vec_len (session_manager_main.sessions))
325 if (pool_is_free_index (session_manager_main.sessions[thread_index], si))
328 ASSERT (stream_session_is_valid (si, thread_index));
329 return pool_elt_at_index (session_manager_main.sessions[thread_index], si);
332 always_inline session_handle_t
333 session_handle (stream_session_t * s)
335 return ((u64) s->thread_index << 32) | (u64) s->session_index;
339 session_index_from_handle (session_handle_t handle)
341 return handle & 0xFFFFFFFF;
345 session_thread_from_handle (session_handle_t handle)
351 session_parse_handle (session_handle_t handle, u32 * index,
354 *index = session_index_from_handle (handle);
355 *thread_index = session_thread_from_handle (handle);
358 always_inline stream_session_t *
359 session_get_from_handle (session_handle_t handle)
361 session_manager_main_t *smm = &session_manager_main;
362 u32 session_index, thread_index;
363 session_parse_handle (handle, &session_index, &thread_index);
364 return pool_elt_at_index (smm->sessions[thread_index], session_index);
367 always_inline stream_session_t *
368 session_get_from_handle_if_valid (session_handle_t handle)
370 u32 session_index, thread_index;
371 session_parse_handle (handle, &session_index, &thread_index);
372 return session_get_if_valid (session_index, thread_index);
376 session_handle_is_local (session_handle_t handle)
378 if ((handle >> 32) == SESSION_LOCAL_HANDLE_PREFIX)
383 always_inline transport_proto_t
384 session_type_transport_proto (session_type_t st)
390 session_type_is_ip4 (session_type_t st)
395 always_inline transport_proto_t
396 session_get_transport_proto (stream_session_t * s)
398 return (s->session_type >> 1);
401 always_inline fib_protocol_t
402 session_get_fib_proto (stream_session_t * s)
404 u8 is_ip4 = s->session_type & 1;
405 return (is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6);
408 always_inline session_type_t
409 session_type_from_proto_and_ip (transport_proto_t proto, u8 is_ip4)
411 return (proto << 1 | is_ip4);
415 session_has_transport (stream_session_t * s)
417 return (session_get_transport_proto (s) != TRANSPORT_PROTO_NONE);
420 transport_service_type_t session_transport_service_type (stream_session_t *);
421 transport_tx_fn_type_t session_transport_tx_fn_type (stream_session_t *);
422 u8 session_tx_is_dgram (stream_session_t * s);
425 * Acquires a lock that blocks a session pool from expanding.
427 * This is typically used for safely peeking into other threads'
428 * pools in order to clone elements. Lock should be dropped as soon
429 * as possible by calling @ref session_pool_remove_peeker.
431 * NOTE: Avoid using pool_elt_at_index while the lock is held because
432 * it may lead to free elt bitmap expansion/contraction!
435 session_pool_add_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_lock (&smm->peekers_rw_locks[thread_index]);
444 session_pool_remove_peeker (u32 thread_index)
446 session_manager_main_t *smm = &session_manager_main;
447 if (thread_index == vlib_get_thread_index ())
449 clib_rwlock_reader_unlock (&smm->peekers_rw_locks[thread_index]);
453 * Get session from handle and 'lock' pool resize if not in same thread
455 * Caller should drop the peek 'lock' as soon as possible.
457 always_inline stream_session_t *
458 session_get_from_handle_safe (u64 handle)
460 session_manager_main_t *smm = &session_manager_main;
461 u32 thread_index = session_thread_from_handle (handle);
462 if (thread_index == vlib_get_thread_index ())
464 return pool_elt_at_index (smm->sessions[thread_index],
465 session_index_from_handle (handle));
469 session_pool_add_peeker (thread_index);
470 /* Don't use pool_elt_at index. See @ref session_pool_add_peeker */
471 return smm->sessions[thread_index] + session_index_from_handle (handle);
476 transport_max_rx_enqueue (transport_connection_t * tc)
478 stream_session_t *s = session_get (tc->s_index, tc->thread_index);
479 return svm_fifo_max_enqueue (s->server_rx_fifo);
483 transport_rx_fifo_size (transport_connection_t * tc)
485 stream_session_t *s = session_get (tc->s_index, tc->thread_index);
486 return s->server_rx_fifo->nitems;
490 transport_tx_fifo_size (transport_connection_t * tc)
492 stream_session_t *s = session_get (tc->s_index, tc->thread_index);
493 return s->server_tx_fifo->nitems;
497 session_get_index (stream_session_t * s)
499 return (s - session_manager_main.sessions[s->thread_index]);
502 always_inline stream_session_t *
503 session_clone_safe (u32 session_index, u32 thread_index)
505 stream_session_t *old_s, *new_s;
506 u32 current_thread_index = vlib_get_thread_index ();
508 /* If during the memcpy pool is reallocated AND the memory allocator
509 * decides to give the old chunk of memory to somebody in a hurry to
510 * scribble something on it, we have a problem. So add this thread as
511 * a session pool peeker.
513 session_pool_add_peeker (thread_index);
514 new_s = session_alloc (current_thread_index);
515 old_s = session_manager_main.sessions[thread_index] + session_index;
516 clib_memcpy (new_s, old_s, sizeof (*new_s));
517 session_pool_remove_peeker (thread_index);
518 new_s->thread_index = current_thread_index;
519 new_s->session_index = session_get_index (new_s);
523 transport_connection_t *session_get_transport (stream_session_t * s);
525 u32 session_tx_fifo_max_dequeue (transport_connection_t * tc);
528 session_enqueue_stream_connection (transport_connection_t * tc,
529 vlib_buffer_t * b, u32 offset,
530 u8 queue_event, u8 is_in_order);
531 int session_enqueue_dgram_connection (stream_session_t * s,
532 session_dgram_hdr_t * hdr,
533 vlib_buffer_t * b, u8 proto,
535 int stream_session_peek_bytes (transport_connection_t * tc, u8 * buffer,
536 u32 offset, u32 max_bytes);
537 u32 stream_session_dequeue_drop (transport_connection_t * tc, u32 max_bytes);
539 int session_stream_connect_notify (transport_connection_t * tc, u8 is_fail);
540 int session_dgram_connect_notify (transport_connection_t * tc,
541 u32 old_thread_index,
542 stream_session_t ** new_session);
543 int session_dequeue_notify (stream_session_t * s);
544 void stream_session_init_fifos_pointers (transport_connection_t * tc,
545 u32 rx_pointer, u32 tx_pointer);
547 void stream_session_accept_notify (transport_connection_t * tc);
548 void stream_session_disconnect_notify (transport_connection_t * tc);
549 void stream_session_delete_notify (transport_connection_t * tc);
550 void stream_session_reset_notify (transport_connection_t * tc);
551 int stream_session_accept (transport_connection_t * tc, u32 listener_index,
553 int session_open (u32 app_index, session_endpoint_t * tep, u32 opaque);
554 int session_listen (stream_session_t * s, session_endpoint_extended_t * sep);
555 int session_stop_listen (stream_session_t * s);
556 void stream_session_disconnect (stream_session_t * s);
557 void stream_session_disconnect_transport (stream_session_t * s);
558 void stream_session_cleanup (stream_session_t * s);
559 int session_send_io_evt_to_thread (svm_fifo_t * f,
560 session_evt_type_t evt_type);
561 int session_send_io_evt_to_thread_custom (void *data, u32 thread_index,
562 session_evt_type_t evt_type);
563 void session_send_rpc_evt_to_thread (u32 thread_index, void *fp,
566 ssvm_private_t *session_manager_get_evt_q_segment (void);
568 u8 *format_stream_session (u8 * s, va_list * args);
569 uword unformat_stream_session (unformat_input_t * input, va_list * args);
570 uword unformat_transport_connection (unformat_input_t * input,
573 void session_register_transport (transport_proto_t transport_proto,
574 const transport_proto_vft_t * vft, u8 is_ip4,
578 transport_add_tx_event (transport_connection_t * tc)
580 stream_session_t *s = session_get (tc->s_index, tc->thread_index);
581 if (svm_fifo_has_event (s->server_tx_fifo))
583 session_send_io_evt_to_thread (s->server_tx_fifo, FIFO_EVENT_APP_TX);
586 clib_error_t *vnet_session_enable_disable (vlib_main_t * vm, u8 is_en);
588 always_inline svm_msg_q_t *
589 session_manager_get_vpp_event_queue (u32 thread_index)
591 return session_manager_main.vpp_event_queues[thread_index];
594 int session_manager_flush_enqueue_events (u8 proto, u32 thread_index);
595 int session_manager_flush_all_enqueue_events (u8 transport_proto);
598 listen_session_get_handle (stream_session_t * s)
600 ASSERT (s->session_state == SESSION_STATE_LISTENING);
601 return session_handle (s);
604 always_inline stream_session_t *
605 listen_session_get_from_handle (session_handle_t handle)
607 return session_get_from_handle (handle);
611 listen_session_parse_handle (session_handle_t handle, u32 * index,
614 session_parse_handle (handle, index, thread_index);
617 always_inline stream_session_t *
618 listen_session_new (u8 thread_index, session_type_t type)
621 s = session_alloc (thread_index);
622 s->session_type = type;
623 s->session_state = SESSION_STATE_LISTENING;
627 always_inline stream_session_t *
628 listen_session_get (u32 index)
630 return session_get (index, 0);
634 listen_session_del (stream_session_t * s)
639 transport_connection_t *listen_session_get_transport (stream_session_t * s);
642 listen_session_get_local_session_endpoint (stream_session_t * listener,
643 session_endpoint_t * sep);
645 void session_flush_frames_main_thread (vlib_main_t * vm);
648 session_manager_is_enabled ()
650 return session_manager_main.is_enabled == 1;
653 #define session_cli_return_if_not_enabled() \
655 if (!session_manager_main.is_enabled) \
656 return clib_error_return(0, "session layer is not enabled"); \
659 void session_node_enable_disable (u8 is_en);
661 #endif /* __included_session_h__ */
664 * fd.io coding-style-patch-verification: ON
667 * eval: (c-set-style "gnu")