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)
29 /* TODO decide how much since we have pre-data as well */
30 #define MAX_HDRS_LEN 100 /* Max number of bytes for headers */
37 FIFO_EVENT_DISCONNECT,
38 FIFO_EVENT_BUILTIN_RX,
42 static inline const char *
43 fifo_event_type_str (fifo_event_type_t et)
47 case FIFO_EVENT_APP_RX:
48 return "FIFO_EVENT_APP_RX";
49 case FIFO_EVENT_APP_TX:
50 return "FIFO_EVENT_APP_TX";
51 case FIFO_EVENT_TIMEOUT:
52 return "FIFO_EVENT_TIMEOUT";
53 case FIFO_EVENT_DISCONNECT:
54 return "FIFO_EVENT_DISCONNECT";
55 case FIFO_EVENT_BUILTIN_RX:
56 return "FIFO_EVENT_BUILTIN_RX";
58 return "FIFO_EVENT_RPC";
60 return "UNKNOWN FIFO EVENT";
64 #define foreach_session_input_error \
65 _(NO_SESSION, "No session drops") \
66 _(NO_LISTENER, "No listener for dst port drops") \
67 _(ENQUEUED, "Packets pushed into rx fifo") \
68 _(NOT_READY, "Session not ready packets") \
69 _(FIFO_FULL, "Packets dropped for lack of rx fifo space") \
70 _(EVENT_FIFO_FULL, "Events not sent for lack of event fifo space") \
71 _(API_QUEUE_FULL, "Sessions not created for lack of API queue space") \
72 _(NEW_SEG_NO_SPACE, "Created segment, couldn't allocate a fifo pair") \
73 _(NO_SPACE, "Couldn't allocate a fifo pair") \
74 _(SEG_CREATE, "Couldn't create a new segment")
78 #define _(sym,str) SESSION_ERROR_##sym,
79 foreach_session_input_error
91 typedef CLIB_PACKED (struct {
100 }) session_fifo_event_t;
103 /* Forward definition */
104 typedef struct _session_manager_main session_manager_main_t;
107 (session_fifo_rx_fn) (vlib_main_t * vm, vlib_node_runtime_t * node,
108 session_manager_main_t * smm,
109 session_fifo_event_t * e0, stream_session_t * s0,
110 u32 thread_index, int *n_tx_pkts);
112 extern session_fifo_rx_fn session_tx_fifo_peek_and_snd;
113 extern session_fifo_rx_fn session_tx_fifo_dequeue_and_snd;
115 u8 session_node_lookup_fifo_event (svm_fifo_t * f, session_fifo_event_t * e);
117 struct _session_manager_main
119 /** Per worker thread session pools */
120 stream_session_t **sessions;
122 /** Per worker-thread session pool peekers rw locks */
123 clib_rwlock_t *peekers_rw_locks;
125 /** Pool of listen sessions. Same type as stream sessions to ease lookups */
126 stream_session_t **listen_sessions;
128 /** Per-proto, per-worker enqueue epoch counters */
129 u32 *current_enqueue_epoch[TRANSPORT_N_PROTO];
131 /** Per-proto, per-worker thread vector of sessions to enqueue */
132 u32 **session_to_enqueue[TRANSPORT_N_PROTO];
134 /** per-worker tx buffer free lists */
137 /** Per worker-thread vector of partially read events */
138 session_fifo_event_t **free_event_vector;
140 /** per-worker active event vectors */
141 session_fifo_event_t **pending_event_vector;
143 /** per-worker postponed disconnects */
144 session_fifo_event_t **pending_disconnects;
146 /** vpp fifo event queue */
147 svm_queue_t **vpp_event_queues;
149 /** Event queues memfd segment initialized only if so configured */
150 ssvm_private_t evt_qs_segment;
152 /** Unique segment name counter */
153 u32 unique_segment_name_counter;
155 /** Per transport rx function that can either dequeue or peek */
156 session_fifo_rx_fn **session_tx_fns;
158 /** Per session type output nodes. Could optimize to group nodes by
159 * fib but lookup would then require session type parsing in session node.
160 * Trade memory for speed, for now */
161 u32 *session_type_to_next;
163 /** Session manager is enabled */
166 /** vpp fifo event queue configured length */
167 u32 configured_event_queue_length;
173 /** Session ssvm segment configs*/
174 uword session_baseva;
175 uword session_va_space_size;
176 u32 evt_qs_segment_size;
177 u8 evt_qs_use_memfd_seg;
179 /** Session table size parameters */
180 u32 configured_v4_session_table_buckets;
181 u32 configured_v4_session_table_memory;
182 u32 configured_v4_halfopen_table_buckets;
183 u32 configured_v4_halfopen_table_memory;
184 u32 configured_v6_session_table_buckets;
185 u32 configured_v6_session_table_memory;
186 u32 configured_v6_halfopen_table_buckets;
187 u32 configured_v6_halfopen_table_memory;
189 /** Transport table (preallocation) size parameters */
190 u32 local_endpoints_table_memory;
191 u32 local_endpoints_table_buckets;
193 /** Preallocate session config parameter */
194 u32 preallocated_sessions;
198 * last event poll time by thread
199 * Debug only. Will cause false cache-line sharing as-is
201 f64 *last_event_poll_by_thread;
206 extern session_manager_main_t session_manager_main;
207 extern vlib_node_registration_t session_queue_node;
210 * Session manager function
212 always_inline session_manager_main_t *
213 vnet_get_session_manager_main ()
215 return &session_manager_main;
219 stream_session_is_valid (u32 si, u8 thread_index)
222 s = pool_elt_at_index (session_manager_main.sessions[thread_index], si);
223 if (s->thread_index != thread_index || s->session_index != si
224 /* || s->server_rx_fifo->master_session_index != si
225 || s->server_tx_fifo->master_session_index != si
226 || s->server_rx_fifo->master_thread_index != thread_index
227 || s->server_tx_fifo->master_thread_index != thread_index */ )
232 stream_session_t *session_alloc (u32 thread_index);
234 always_inline stream_session_t *
235 session_get (u32 si, u32 thread_index)
237 ASSERT (stream_session_is_valid (si, thread_index));
238 return pool_elt_at_index (session_manager_main.sessions[thread_index], si);
241 always_inline stream_session_t *
242 session_get_if_valid (u64 si, u32 thread_index)
244 if (thread_index >= vec_len (session_manager_main.sessions))
247 if (pool_is_free_index (session_manager_main.sessions[thread_index], si))
250 ASSERT (stream_session_is_valid (si, thread_index));
251 return pool_elt_at_index (session_manager_main.sessions[thread_index], si);
255 session_handle (stream_session_t * s)
257 return ((u64) s->thread_index << 32) | (u64) s->session_index;
261 session_index_from_handle (u64 handle)
263 return handle & 0xFFFFFFFF;
267 session_thread_from_handle (u64 handle)
273 session_parse_handle (u64 handle, u32 * index, u32 * thread_index)
275 *index = session_index_from_handle (handle);
276 *thread_index = session_thread_from_handle (handle);
279 always_inline stream_session_t *
280 session_get_from_handle (u64 handle)
282 session_manager_main_t *smm = &session_manager_main;
284 pool_elt_at_index (smm->sessions[session_thread_from_handle (handle)],
285 session_index_from_handle (handle));
288 always_inline transport_proto_t
289 session_get_transport_proto (stream_session_t * s)
291 return (s->session_type >> 1);
294 always_inline session_type_t
295 session_type_from_proto_and_ip (transport_proto_t proto, u8 is_ip4)
297 return (proto << 1 | is_ip4);
301 * Acquires a lock that blocks a session pool from expanding.
303 * This is typically used for safely peeking into other threads'
304 * pools in order to clone elements. Lock should be dropped as soon
305 * as possible by calling @ref session_pool_remove_peeker.
307 * NOTE: Avoid using pool_elt_at_index while the lock is held because
308 * it may lead to free elt bitmap expansion/contraction!
311 session_pool_add_peeker (u32 thread_index)
313 session_manager_main_t *smm = &session_manager_main;
314 if (thread_index == vlib_get_thread_index ())
316 clib_rwlock_reader_lock (&smm->peekers_rw_locks[thread_index]);
320 session_pool_remove_peeker (u32 thread_index)
322 session_manager_main_t *smm = &session_manager_main;
323 if (thread_index == vlib_get_thread_index ())
325 clib_rwlock_reader_unlock (&smm->peekers_rw_locks[thread_index]);
329 * Get session from handle and 'lock' pool resize if not in same thread
331 * Caller should drop the peek 'lock' as soon as possible.
333 always_inline stream_session_t *
334 session_get_from_handle_safe (u64 handle)
336 session_manager_main_t *smm = &session_manager_main;
337 u32 thread_index = session_thread_from_handle (handle);
338 if (thread_index == vlib_get_thread_index ())
340 return pool_elt_at_index (smm->sessions[thread_index],
341 session_index_from_handle (handle));
345 session_pool_add_peeker (thread_index);
346 /* Don't use pool_elt_at index. See @ref session_pool_add_peeker */
347 return smm->sessions[thread_index] + session_index_from_handle (handle);
351 always_inline stream_session_t *
352 stream_session_listener_get (u8 sst, u64 si)
354 return pool_elt_at_index (session_manager_main.listen_sessions[sst], si);
358 stream_session_get_index (stream_session_t * s)
360 if (s->session_state == SESSION_STATE_LISTENING)
361 return s - session_manager_main.listen_sessions[s->session_type];
363 return s - session_manager_main.sessions[s->thread_index];
367 stream_session_max_rx_enqueue (transport_connection_t * tc)
369 stream_session_t *s = session_get (tc->s_index, tc->thread_index);
370 return svm_fifo_max_enqueue (s->server_rx_fifo);
374 stream_session_rx_fifo_size (transport_connection_t * tc)
376 stream_session_t *s = session_get (tc->s_index, tc->thread_index);
377 return s->server_rx_fifo->nitems;
381 session_get_index (stream_session_t * s)
383 return (s - session_manager_main.sessions[s->thread_index]);
386 always_inline stream_session_t *
387 session_clone_safe (u32 session_index, u32 thread_index)
389 stream_session_t *old_s, *new_s;
390 u32 current_thread_index = vlib_get_thread_index ();
392 /* If during the memcpy pool is reallocated AND the memory allocator
393 * decides to give the old chunk of memory to somebody in a hurry to
394 * scribble something on it, we have a problem. So add this thread as
395 * a session pool peeker.
397 session_pool_add_peeker (thread_index);
398 new_s = session_alloc (current_thread_index);
399 old_s = session_manager_main.sessions[thread_index] + session_index;
400 clib_memcpy (new_s, old_s, sizeof (*new_s));
401 session_pool_remove_peeker (thread_index);
402 new_s->thread_index = current_thread_index;
403 new_s->session_index = session_get_index (new_s);
407 transport_connection_t *session_get_transport (stream_session_t * s);
409 u32 stream_session_tx_fifo_max_dequeue (transport_connection_t * tc);
411 stream_session_t *session_alloc (u32 thread_index);
413 session_enqueue_stream_connection (transport_connection_t * tc,
414 vlib_buffer_t * b, u32 offset,
415 u8 queue_event, u8 is_in_order);
416 int session_enqueue_dgram_connection (stream_session_t * s, vlib_buffer_t * b,
417 u8 proto, u8 queue_event);
418 int stream_session_peek_bytes (transport_connection_t * tc, u8 * buffer,
419 u32 offset, u32 max_bytes);
420 u32 stream_session_dequeue_drop (transport_connection_t * tc, u32 max_bytes);
422 int session_stream_connect_notify (transport_connection_t * tc, u8 is_fail);
423 int session_dgram_connect_notify (transport_connection_t * tc,
424 u32 old_thread_index,
425 stream_session_t ** new_session);
426 void stream_session_init_fifos_pointers (transport_connection_t * tc,
427 u32 rx_pointer, u32 tx_pointer);
429 void stream_session_accept_notify (transport_connection_t * tc);
430 void stream_session_disconnect_notify (transport_connection_t * tc);
431 void stream_session_delete_notify (transport_connection_t * tc);
432 void stream_session_reset_notify (transport_connection_t * tc);
433 int stream_session_accept (transport_connection_t * tc, u32 listener_index,
435 int session_open (u32 app_index, session_endpoint_t * tep, u32 opaque);
436 int stream_session_listen (stream_session_t * s, session_endpoint_t * tep);
437 int stream_session_stop_listen (stream_session_t * s);
438 void stream_session_disconnect (stream_session_t * s);
439 void stream_session_disconnect_transport (stream_session_t * s);
440 void stream_session_cleanup (stream_session_t * s);
441 void session_send_session_evt_to_thread (u64 session_handle,
442 fifo_event_type_t evt_type,
444 ssvm_private_t *session_manager_get_evt_q_segment (void);
446 u8 *format_stream_session (u8 * s, va_list * args);
447 uword unformat_stream_session (unformat_input_t * input, va_list * args);
448 uword unformat_transport_connection (unformat_input_t * input,
451 void session_register_transport (transport_proto_t transport_proto,
452 const transport_proto_vft_t * vft, u8 is_ip4,
455 clib_error_t *vnet_session_enable_disable (vlib_main_t * vm, u8 is_en);
457 always_inline svm_queue_t *
458 session_manager_get_vpp_event_queue (u32 thread_index)
460 return session_manager_main.vpp_event_queues[thread_index];
463 int session_manager_flush_enqueue_events (u8 proto, u32 thread_index);
466 listen_session_get_handle (stream_session_t * s)
468 ASSERT (s->session_state == SESSION_STATE_LISTENING);
469 return ((u64) s->session_type << 32) | s->session_index;
472 always_inline stream_session_t *
473 listen_session_get_from_handle (u64 handle)
475 session_manager_main_t *smm = &session_manager_main;
479 index = handle & 0xFFFFFFFF;
481 if (pool_is_free_index (smm->listen_sessions[type], index))
484 s = pool_elt_at_index (smm->listen_sessions[type], index);
485 ASSERT (s->session_state == SESSION_STATE_LISTENING);
489 always_inline stream_session_t *
490 listen_session_new (session_type_t type)
493 pool_get_aligned (session_manager_main.listen_sessions[type], s,
494 CLIB_CACHE_LINE_BYTES);
495 memset (s, 0, sizeof (*s));
497 s->session_type = type;
498 s->session_state = SESSION_STATE_LISTENING;
499 s->session_index = s - session_manager_main.listen_sessions[type];
504 always_inline stream_session_t *
505 listen_session_get (session_type_t type, u32 index)
507 return pool_elt_at_index (session_manager_main.listen_sessions[type],
512 listen_session_del (stream_session_t * s)
514 pool_put (session_manager_main.listen_sessions[s->session_type], s);
517 transport_connection_t *listen_session_get_transport (stream_session_t * s);
520 listen_session_get_local_session_endpoint (stream_session_t * listener,
521 session_endpoint_t * sep);
523 always_inline stream_session_t *
524 session_manager_get_listener (u8 session_type, u32 index)
527 pool_elt_at_index (session_manager_main.listen_sessions[session_type],
532 * Set peek or dequeue function for given session type
534 * Reliable transport protocols will probably want to use a peek function
537 session_manager_set_transport_rx_fn (session_type_t type, u8 is_peek)
539 session_manager_main.session_tx_fns[type] = (is_peek) ?
540 session_tx_fifo_peek_and_snd : session_tx_fifo_dequeue_and_snd;
544 session_manager_is_enabled ()
546 return session_manager_main.is_enabled == 1;
549 #define session_cli_return_if_not_enabled() \
551 if (!session_manager_main.is_enabled) \
552 return clib_error_return(0, "session layer is not enabled"); \
555 void session_node_enable_disable (u8 is_en);
557 #endif /* __included_session_h__ */
560 * fd.io coding-style-patch-verification: ON
563 * eval: (c-set-style "gnu")