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 (fifo_event_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";
65 #define foreach_session_input_error \
66 _(NO_SESSION, "No session drops") \
67 _(NO_LISTENER, "No listener for dst port drops") \
68 _(ENQUEUED, "Packets pushed into rx fifo") \
69 _(NOT_READY, "Session not ready packets") \
70 _(FIFO_FULL, "Packets dropped for lack of rx fifo space") \
71 _(EVENT_FIFO_FULL, "Events not sent for lack of event fifo space") \
72 _(API_QUEUE_FULL, "Sessions not created for lack of API queue space") \
73 _(NEW_SEG_NO_SPACE, "Created segment, couldn't allocate a fifo pair") \
74 _(NO_SPACE, "Couldn't allocate a fifo pair") \
75 _(SEG_CREATE, "Couldn't create a new segment")
79 #define _(sym,str) SESSION_ERROR_##sym,
80 foreach_session_input_error
91 typedef u64 session_handle_t;
94 typedef CLIB_PACKED (struct {
98 session_handle_t session_handle;
103 }) session_fifo_event_t;
106 /* Forward definition */
107 typedef struct _session_manager_main session_manager_main_t;
110 (session_fifo_rx_fn) (vlib_main_t * vm, vlib_node_runtime_t * node,
111 session_manager_main_t * smm,
112 session_fifo_event_t * e0, stream_session_t * s0,
113 u32 thread_index, int *n_tx_pkts);
115 extern session_fifo_rx_fn session_tx_fifo_peek_and_snd;
116 extern session_fifo_rx_fn session_tx_fifo_dequeue_and_snd;
117 extern session_fifo_rx_fn session_tx_fifo_dequeue_internal;
119 u8 session_node_lookup_fifo_event (svm_fifo_t * f, session_fifo_event_t * e);
121 struct _session_manager_main
123 /** Per worker thread session pools */
124 stream_session_t **sessions;
126 /** Per worker-thread session pool peekers rw locks */
127 clib_rwlock_t *peekers_rw_locks;
129 /** Per-proto, per-worker enqueue epoch counters */
130 u32 *current_enqueue_epoch[TRANSPORT_N_PROTO];
132 /** Per-proto, per-worker thread vector of sessions to enqueue */
133 u32 **session_to_enqueue[TRANSPORT_N_PROTO];
135 /** per-worker tx buffer free lists */
138 /** Per worker-thread vector of partially read events */
139 session_fifo_event_t **free_event_vector;
141 /** per-worker active event vectors */
142 session_fifo_event_t **pending_event_vector;
144 /** per-worker postponed disconnects */
145 session_fifo_event_t **pending_disconnects;
147 /** vpp fifo event queue */
148 svm_queue_t **vpp_event_queues;
150 /** Event queues memfd segment initialized only if so configured */
151 ssvm_private_t evt_qs_segment;
153 /** Unique segment name counter */
154 u32 unique_segment_name_counter;
156 /** Per transport rx function that can either dequeue or peek */
157 session_fifo_rx_fn **session_tx_fns;
159 /** Per session type output nodes. Could optimize to group nodes by
160 * fib but lookup would then require session type parsing in session node.
161 * Trade memory for speed, for now */
162 u32 *session_type_to_next;
164 /** Session manager is enabled */
167 /** vpp fifo event queue configured length */
168 u32 configured_event_queue_length;
174 /** Session ssvm segment configs*/
175 uword session_baseva;
176 uword session_va_space_size;
177 u32 evt_qs_segment_size;
178 u8 evt_qs_use_memfd_seg;
180 /** Session table size parameters */
181 u32 configured_v4_session_table_buckets;
182 u32 configured_v4_session_table_memory;
183 u32 configured_v4_halfopen_table_buckets;
184 u32 configured_v4_halfopen_table_memory;
185 u32 configured_v6_session_table_buckets;
186 u32 configured_v6_session_table_memory;
187 u32 configured_v6_halfopen_table_buckets;
188 u32 configured_v6_halfopen_table_memory;
190 /** Transport table (preallocation) size parameters */
191 u32 local_endpoints_table_memory;
192 u32 local_endpoints_table_buckets;
194 /** Preallocate session config parameter */
195 u32 preallocated_sessions;
199 * last event poll time by thread
200 * Debug only. Will cause false cache-line sharing as-is
202 f64 *last_event_poll_by_thread;
207 typedef struct session_dgram_pre_hdr_
211 } session_dgram_pre_hdr_t;
214 typedef CLIB_PACKED (struct session_dgram_header_
218 ip46_address_t rmt_ip;
219 ip46_address_t lcl_ip;
223 }) session_dgram_hdr_t;
226 #define SESSION_CONN_ID_LEN 37
227 #define SESSION_CONN_HDR_LEN 45
229 STATIC_ASSERT (sizeof (session_dgram_hdr_t) == (SESSION_CONN_ID_LEN + 8),
230 "session conn id wrong length");
232 extern session_manager_main_t session_manager_main;
233 extern vlib_node_registration_t session_queue_node;
236 * Session manager function
238 always_inline session_manager_main_t *
239 vnet_get_session_manager_main ()
241 return &session_manager_main;
245 stream_session_is_valid (u32 si, u8 thread_index)
248 s = pool_elt_at_index (session_manager_main.sessions[thread_index], si);
249 if (s->thread_index != thread_index || s->session_index != si
250 /* || s->server_rx_fifo->master_session_index != si
251 || s->server_tx_fifo->master_session_index != si
252 || s->server_rx_fifo->master_thread_index != thread_index
253 || s->server_tx_fifo->master_thread_index != thread_index */ )
258 stream_session_t *session_alloc (u32 thread_index);
259 int session_alloc_fifos (segment_manager_t * sm, stream_session_t * s);
260 void session_free (stream_session_t * s);
262 always_inline stream_session_t *
263 session_get (u32 si, u32 thread_index)
265 ASSERT (stream_session_is_valid (si, thread_index));
266 return pool_elt_at_index (session_manager_main.sessions[thread_index], si);
269 always_inline stream_session_t *
270 session_get_if_valid (u64 si, u32 thread_index)
272 if (thread_index >= vec_len (session_manager_main.sessions))
275 if (pool_is_free_index (session_manager_main.sessions[thread_index], si))
278 ASSERT (stream_session_is_valid (si, thread_index));
279 return pool_elt_at_index (session_manager_main.sessions[thread_index], si);
282 always_inline session_handle_t
283 session_handle (stream_session_t * s)
285 return ((u64) s->thread_index << 32) | (u64) s->session_index;
289 session_index_from_handle (session_handle_t handle)
291 return handle & 0xFFFFFFFF;
295 session_thread_from_handle (session_handle_t handle)
301 session_parse_handle (session_handle_t handle, u32 * index,
304 *index = session_index_from_handle (handle);
305 *thread_index = session_thread_from_handle (handle);
308 always_inline stream_session_t *
309 session_get_from_handle (session_handle_t handle)
311 session_manager_main_t *smm = &session_manager_main;
312 u32 session_index, thread_index;
313 session_parse_handle (handle, &session_index, &thread_index);
314 return pool_elt_at_index (smm->sessions[thread_index], session_index);
317 always_inline stream_session_t *
318 session_get_from_handle_if_valid (session_handle_t handle)
320 u32 session_index, thread_index;
321 session_parse_handle (handle, &session_index, &thread_index);
322 return session_get_if_valid (session_index, thread_index);
326 session_handle_is_local (session_handle_t handle)
328 if ((handle >> 32) == SESSION_LOCAL_HANDLE_PREFIX)
333 always_inline transport_proto_t
334 session_type_transport_proto (session_type_t st)
340 session_type_is_ip4 (session_type_t st)
345 always_inline transport_proto_t
346 session_get_transport_proto (stream_session_t * s)
348 return (s->session_type >> 1);
351 always_inline fib_protocol_t
352 session_get_fib_proto (stream_session_t * s)
354 u8 is_ip4 = s->session_type & 1;
355 return (is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6);
358 always_inline session_type_t
359 session_type_from_proto_and_ip (transport_proto_t proto, u8 is_ip4)
361 return (proto << 1 | is_ip4);
365 session_has_transport (stream_session_t * s)
367 return (session_get_transport_proto (s) != TRANSPORT_PROTO_NONE);
370 always_inline transport_service_type_t
371 session_transport_service_type (stream_session_t * s)
373 transport_proto_t tp;
374 tp = session_get_transport_proto (s);
375 return transport_protocol_service_type (tp);
379 * Acquires a lock that blocks a session pool from expanding.
381 * This is typically used for safely peeking into other threads'
382 * pools in order to clone elements. Lock should be dropped as soon
383 * as possible by calling @ref session_pool_remove_peeker.
385 * NOTE: Avoid using pool_elt_at_index while the lock is held because
386 * it may lead to free elt bitmap expansion/contraction!
389 session_pool_add_peeker (u32 thread_index)
391 session_manager_main_t *smm = &session_manager_main;
392 if (thread_index == vlib_get_thread_index ())
394 clib_rwlock_reader_lock (&smm->peekers_rw_locks[thread_index]);
398 session_pool_remove_peeker (u32 thread_index)
400 session_manager_main_t *smm = &session_manager_main;
401 if (thread_index == vlib_get_thread_index ())
403 clib_rwlock_reader_unlock (&smm->peekers_rw_locks[thread_index]);
407 * Get session from handle and 'lock' pool resize if not in same thread
409 * Caller should drop the peek 'lock' as soon as possible.
411 always_inline stream_session_t *
412 session_get_from_handle_safe (u64 handle)
414 session_manager_main_t *smm = &session_manager_main;
415 u32 thread_index = session_thread_from_handle (handle);
416 if (thread_index == vlib_get_thread_index ())
418 return pool_elt_at_index (smm->sessions[thread_index],
419 session_index_from_handle (handle));
423 session_pool_add_peeker (thread_index);
424 /* Don't use pool_elt_at index. See @ref session_pool_add_peeker */
425 return smm->sessions[thread_index] + session_index_from_handle (handle);
430 stream_session_max_rx_enqueue (transport_connection_t * tc)
432 stream_session_t *s = session_get (tc->s_index, tc->thread_index);
433 return svm_fifo_max_enqueue (s->server_rx_fifo);
437 stream_session_rx_fifo_size (transport_connection_t * tc)
439 stream_session_t *s = session_get (tc->s_index, tc->thread_index);
440 return s->server_rx_fifo->nitems;
444 session_get_index (stream_session_t * s)
446 return (s - session_manager_main.sessions[s->thread_index]);
449 always_inline stream_session_t *
450 session_clone_safe (u32 session_index, u32 thread_index)
452 stream_session_t *old_s, *new_s;
453 u32 current_thread_index = vlib_get_thread_index ();
455 /* If during the memcpy pool is reallocated AND the memory allocator
456 * decides to give the old chunk of memory to somebody in a hurry to
457 * scribble something on it, we have a problem. So add this thread as
458 * a session pool peeker.
460 session_pool_add_peeker (thread_index);
461 new_s = session_alloc (current_thread_index);
462 old_s = session_manager_main.sessions[thread_index] + session_index;
463 clib_memcpy (new_s, old_s, sizeof (*new_s));
464 session_pool_remove_peeker (thread_index);
465 new_s->thread_index = current_thread_index;
466 new_s->session_index = session_get_index (new_s);
470 transport_connection_t *session_get_transport (stream_session_t * s);
472 u32 stream_session_tx_fifo_max_dequeue (transport_connection_t * tc);
475 session_enqueue_stream_connection (transport_connection_t * tc,
476 vlib_buffer_t * b, u32 offset,
477 u8 queue_event, u8 is_in_order);
478 int session_enqueue_dgram_connection (stream_session_t * s,
479 session_dgram_hdr_t * hdr,
480 vlib_buffer_t * b, u8 proto,
482 int stream_session_peek_bytes (transport_connection_t * tc, u8 * buffer,
483 u32 offset, u32 max_bytes);
484 u32 stream_session_dequeue_drop (transport_connection_t * tc, u32 max_bytes);
486 int session_stream_connect_notify (transport_connection_t * tc, u8 is_fail);
487 int session_dgram_connect_notify (transport_connection_t * tc,
488 u32 old_thread_index,
489 stream_session_t ** new_session);
490 void stream_session_init_fifos_pointers (transport_connection_t * tc,
491 u32 rx_pointer, u32 tx_pointer);
493 void stream_session_accept_notify (transport_connection_t * tc);
494 void stream_session_disconnect_notify (transport_connection_t * tc);
495 void stream_session_delete_notify (transport_connection_t * tc);
496 void stream_session_reset_notify (transport_connection_t * tc);
497 int stream_session_accept (transport_connection_t * tc, u32 listener_index,
499 int session_open (u32 app_index, session_endpoint_t * tep, u32 opaque);
500 int stream_session_listen (stream_session_t * s, session_endpoint_t * tep);
501 int stream_session_stop_listen (stream_session_t * s);
502 void stream_session_disconnect (stream_session_t * s);
503 void stream_session_disconnect_transport (stream_session_t * s);
504 void stream_session_cleanup (stream_session_t * s);
505 void session_send_session_evt_to_thread (u64 session_handle,
506 fifo_event_type_t evt_type,
508 ssvm_private_t *session_manager_get_evt_q_segment (void);
510 u8 *format_stream_session (u8 * s, va_list * args);
511 uword unformat_stream_session (unformat_input_t * input, va_list * args);
512 uword unformat_transport_connection (unformat_input_t * input,
515 void session_register_transport (transport_proto_t transport_proto,
516 const transport_proto_vft_t * vft, u8 is_ip4,
519 clib_error_t *vnet_session_enable_disable (vlib_main_t * vm, u8 is_en);
521 always_inline svm_queue_t *
522 session_manager_get_vpp_event_queue (u32 thread_index)
524 return session_manager_main.vpp_event_queues[thread_index];
527 int session_manager_flush_enqueue_events (u8 proto, u32 thread_index);
528 int session_manager_flush_all_enqueue_events (u8 transport_proto);
531 listen_session_get_handle (stream_session_t * s)
533 ASSERT (s->session_state == SESSION_STATE_LISTENING);
534 return session_handle (s);
537 always_inline stream_session_t *
538 listen_session_get_from_handle (session_handle_t handle)
540 return session_get_from_handle (handle);
544 listen_session_parse_handle (session_handle_t handle, u32 * index,
547 session_parse_handle (handle, index, thread_index);
550 always_inline stream_session_t *
551 listen_session_new (u8 thread_index, session_type_t type)
554 s = session_alloc (thread_index);
555 s->session_type = type;
556 s->session_state = SESSION_STATE_LISTENING;
560 always_inline stream_session_t *
561 listen_session_get (u32 index)
563 return session_get (index, 0);
567 listen_session_del (stream_session_t * s)
572 transport_connection_t *listen_session_get_transport (stream_session_t * s);
575 listen_session_get_local_session_endpoint (stream_session_t * listener,
576 session_endpoint_t * sep);
579 session_manager_is_enabled ()
581 return session_manager_main.is_enabled == 1;
584 #define session_cli_return_if_not_enabled() \
586 if (!session_manager_main.is_enabled) \
587 return clib_error_return(0, "session layer is not enabled"); \
590 void session_node_enable_disable (u8 is_en);
592 #endif /* __included_session_h__ */
595 * fd.io coding-style-patch-verification: ON
598 * eval: (c-set-style "gnu")