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 typedef struct session_dgram_pre_hdr_
110 } session_dgram_pre_hdr_t;
113 typedef CLIB_PACKED (struct session_dgram_header_
117 ip46_address_t rmt_ip;
118 ip46_address_t lcl_ip;
122 }) session_dgram_hdr_t;
125 #define SESSION_CONN_ID_LEN 37
126 #define SESSION_CONN_HDR_LEN 45
128 STATIC_ASSERT (sizeof (session_dgram_hdr_t) == (SESSION_CONN_ID_LEN + 8),
129 "session conn id wrong length");
131 typedef struct session_tx_context_
133 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
135 transport_proto_vft_t *transport_vft;
136 transport_connection_t *tc;
143 u16 deq_per_first_buf;
147 CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
148 session_dgram_hdr_t hdr;
149 } session_tx_context_t;
151 /* Forward definition */
152 typedef struct _session_manager_main session_manager_main_t;
155 (session_fifo_rx_fn) (vlib_main_t * vm, vlib_node_runtime_t * node,
156 session_fifo_event_t * e0, stream_session_t * s0,
159 extern session_fifo_rx_fn session_tx_fifo_peek_and_snd;
160 extern session_fifo_rx_fn session_tx_fifo_dequeue_and_snd;
161 extern session_fifo_rx_fn session_tx_fifo_dequeue_internal;
163 u8 session_node_lookup_fifo_event (svm_fifo_t * f, session_fifo_event_t * e);
165 struct _session_manager_main
167 /** Per worker thread session pools */
168 stream_session_t **sessions;
170 /** Per worker-thread session pool peekers rw locks */
171 clib_rwlock_t *peekers_rw_locks;
173 /** Per-proto, per-worker enqueue epoch counters */
174 u32 *current_enqueue_epoch[TRANSPORT_N_PROTO];
176 /** Per-proto, per-worker thread vector of sessions to enqueue */
177 u32 **session_to_enqueue[TRANSPORT_N_PROTO];
179 /** per-worker tx buffer free lists */
182 /** Per worker-thread vector of partially read events */
183 session_fifo_event_t **free_event_vector;
185 /** per-worker active event vectors */
186 session_fifo_event_t **pending_event_vector;
188 /** per-worker postponed disconnects */
189 session_fifo_event_t **pending_disconnects;
191 /** per-worker session context */
192 session_tx_context_t *ctx;
194 /** vpp fifo event queue */
195 svm_queue_t **vpp_event_queues;
197 /** Event queues memfd segment initialized only if so configured */
198 ssvm_private_t evt_qs_segment;
200 /** Unique segment name counter */
201 u32 unique_segment_name_counter;
203 /** Per transport rx function that can either dequeue or peek */
204 session_fifo_rx_fn **session_tx_fns;
206 /** Per session type output nodes. Could optimize to group nodes by
207 * fib but lookup would then require session type parsing in session node.
208 * Trade memory for speed, for now */
209 u32 *session_type_to_next;
211 /** Session manager is enabled */
214 /** vpp fifo event queue configured length */
215 u32 configured_event_queue_length;
221 /** Session ssvm segment configs*/
222 uword session_baseva;
223 uword session_va_space_size;
224 u32 evt_qs_segment_size;
225 u8 evt_qs_use_memfd_seg;
227 /** Session table size parameters */
228 u32 configured_v4_session_table_buckets;
229 u32 configured_v4_session_table_memory;
230 u32 configured_v4_halfopen_table_buckets;
231 u32 configured_v4_halfopen_table_memory;
232 u32 configured_v6_session_table_buckets;
233 u32 configured_v6_session_table_memory;
234 u32 configured_v6_halfopen_table_buckets;
235 u32 configured_v6_halfopen_table_memory;
237 /** Transport table (preallocation) size parameters */
238 u32 local_endpoints_table_memory;
239 u32 local_endpoints_table_buckets;
241 /** Preallocate session config parameter */
242 u32 preallocated_sessions;
246 * last event poll time by thread
247 * Debug only. Will cause false cache-line sharing as-is
249 f64 *last_event_poll_by_thread;
254 extern session_manager_main_t session_manager_main;
255 extern vlib_node_registration_t session_queue_node;
258 * Session manager function
260 always_inline session_manager_main_t *
261 vnet_get_session_manager_main ()
263 return &session_manager_main;
267 stream_session_is_valid (u32 si, u8 thread_index)
270 s = pool_elt_at_index (session_manager_main.sessions[thread_index], si);
271 if (s->thread_index != thread_index || s->session_index != si
272 /* || s->server_rx_fifo->master_session_index != si
273 || s->server_tx_fifo->master_session_index != si
274 || s->server_rx_fifo->master_thread_index != thread_index
275 || s->server_tx_fifo->master_thread_index != thread_index */ )
280 stream_session_t *session_alloc (u32 thread_index);
281 int session_alloc_fifos (segment_manager_t * sm, stream_session_t * s);
282 void session_free (stream_session_t * s);
284 always_inline stream_session_t *
285 session_get (u32 si, u32 thread_index)
287 ASSERT (stream_session_is_valid (si, thread_index));
288 return pool_elt_at_index (session_manager_main.sessions[thread_index], si);
291 always_inline stream_session_t *
292 session_get_if_valid (u64 si, u32 thread_index)
294 if (thread_index >= vec_len (session_manager_main.sessions))
297 if (pool_is_free_index (session_manager_main.sessions[thread_index], si))
300 ASSERT (stream_session_is_valid (si, thread_index));
301 return pool_elt_at_index (session_manager_main.sessions[thread_index], si);
304 always_inline session_handle_t
305 session_handle (stream_session_t * s)
307 return ((u64) s->thread_index << 32) | (u64) s->session_index;
311 session_index_from_handle (session_handle_t handle)
313 return handle & 0xFFFFFFFF;
317 session_thread_from_handle (session_handle_t handle)
323 session_parse_handle (session_handle_t handle, u32 * index,
326 *index = session_index_from_handle (handle);
327 *thread_index = session_thread_from_handle (handle);
330 always_inline stream_session_t *
331 session_get_from_handle (session_handle_t handle)
333 session_manager_main_t *smm = &session_manager_main;
334 u32 session_index, thread_index;
335 session_parse_handle (handle, &session_index, &thread_index);
336 return pool_elt_at_index (smm->sessions[thread_index], session_index);
339 always_inline stream_session_t *
340 session_get_from_handle_if_valid (session_handle_t handle)
342 u32 session_index, thread_index;
343 session_parse_handle (handle, &session_index, &thread_index);
344 return session_get_if_valid (session_index, thread_index);
348 session_handle_is_local (session_handle_t handle)
350 if ((handle >> 32) == SESSION_LOCAL_HANDLE_PREFIX)
355 always_inline transport_proto_t
356 session_type_transport_proto (session_type_t st)
362 session_type_is_ip4 (session_type_t st)
367 always_inline transport_proto_t
368 session_get_transport_proto (stream_session_t * s)
370 return (s->session_type >> 1);
373 always_inline fib_protocol_t
374 session_get_fib_proto (stream_session_t * s)
376 u8 is_ip4 = s->session_type & 1;
377 return (is_ip4 ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6);
380 always_inline session_type_t
381 session_type_from_proto_and_ip (transport_proto_t proto, u8 is_ip4)
383 return (proto << 1 | is_ip4);
387 session_has_transport (stream_session_t * s)
389 return (session_get_transport_proto (s) != TRANSPORT_PROTO_NONE);
392 always_inline transport_service_type_t
393 session_transport_service_type (stream_session_t * s)
395 transport_proto_t tp;
396 tp = session_get_transport_proto (s);
397 return transport_protocol_service_type (tp);
401 * Acquires a lock that blocks a session pool from expanding.
403 * This is typically used for safely peeking into other threads'
404 * pools in order to clone elements. Lock should be dropped as soon
405 * as possible by calling @ref session_pool_remove_peeker.
407 * NOTE: Avoid using pool_elt_at_index while the lock is held because
408 * it may lead to free elt bitmap expansion/contraction!
411 session_pool_add_peeker (u32 thread_index)
413 session_manager_main_t *smm = &session_manager_main;
414 if (thread_index == vlib_get_thread_index ())
416 clib_rwlock_reader_lock (&smm->peekers_rw_locks[thread_index]);
420 session_pool_remove_peeker (u32 thread_index)
422 session_manager_main_t *smm = &session_manager_main;
423 if (thread_index == vlib_get_thread_index ())
425 clib_rwlock_reader_unlock (&smm->peekers_rw_locks[thread_index]);
429 * Get session from handle and 'lock' pool resize if not in same thread
431 * Caller should drop the peek 'lock' as soon as possible.
433 always_inline stream_session_t *
434 session_get_from_handle_safe (u64 handle)
436 session_manager_main_t *smm = &session_manager_main;
437 u32 thread_index = session_thread_from_handle (handle);
438 if (thread_index == vlib_get_thread_index ())
440 return pool_elt_at_index (smm->sessions[thread_index],
441 session_index_from_handle (handle));
445 session_pool_add_peeker (thread_index);
446 /* Don't use pool_elt_at index. See @ref session_pool_add_peeker */
447 return smm->sessions[thread_index] + session_index_from_handle (handle);
452 stream_session_max_rx_enqueue (transport_connection_t * tc)
454 stream_session_t *s = session_get (tc->s_index, tc->thread_index);
455 return svm_fifo_max_enqueue (s->server_rx_fifo);
459 stream_session_rx_fifo_size (transport_connection_t * tc)
461 stream_session_t *s = session_get (tc->s_index, tc->thread_index);
462 return s->server_rx_fifo->nitems;
466 session_get_index (stream_session_t * s)
468 return (s - session_manager_main.sessions[s->thread_index]);
471 always_inline stream_session_t *
472 session_clone_safe (u32 session_index, u32 thread_index)
474 stream_session_t *old_s, *new_s;
475 u32 current_thread_index = vlib_get_thread_index ();
477 /* If during the memcpy pool is reallocated AND the memory allocator
478 * decides to give the old chunk of memory to somebody in a hurry to
479 * scribble something on it, we have a problem. So add this thread as
480 * a session pool peeker.
482 session_pool_add_peeker (thread_index);
483 new_s = session_alloc (current_thread_index);
484 old_s = session_manager_main.sessions[thread_index] + session_index;
485 clib_memcpy (new_s, old_s, sizeof (*new_s));
486 session_pool_remove_peeker (thread_index);
487 new_s->thread_index = current_thread_index;
488 new_s->session_index = session_get_index (new_s);
492 transport_connection_t *session_get_transport (stream_session_t * s);
494 u32 stream_session_tx_fifo_max_dequeue (transport_connection_t * tc);
497 session_enqueue_stream_connection (transport_connection_t * tc,
498 vlib_buffer_t * b, u32 offset,
499 u8 queue_event, u8 is_in_order);
500 int session_enqueue_dgram_connection (stream_session_t * s,
501 session_dgram_hdr_t * hdr,
502 vlib_buffer_t * b, u8 proto,
504 int stream_session_peek_bytes (transport_connection_t * tc, u8 * buffer,
505 u32 offset, u32 max_bytes);
506 u32 stream_session_dequeue_drop (transport_connection_t * tc, u32 max_bytes);
508 int session_stream_connect_notify (transport_connection_t * tc, u8 is_fail);
509 int session_dgram_connect_notify (transport_connection_t * tc,
510 u32 old_thread_index,
511 stream_session_t ** new_session);
512 void stream_session_init_fifos_pointers (transport_connection_t * tc,
513 u32 rx_pointer, u32 tx_pointer);
515 void stream_session_accept_notify (transport_connection_t * tc);
516 void stream_session_disconnect_notify (transport_connection_t * tc);
517 void stream_session_delete_notify (transport_connection_t * tc);
518 void stream_session_reset_notify (transport_connection_t * tc);
519 int stream_session_accept (transport_connection_t * tc, u32 listener_index,
521 int session_open (u32 app_index, session_endpoint_t * tep, u32 opaque);
522 int stream_session_listen (stream_session_t * s, session_endpoint_t * tep);
523 int stream_session_stop_listen (stream_session_t * s);
524 void stream_session_disconnect (stream_session_t * s);
525 void stream_session_disconnect_transport (stream_session_t * s);
526 void stream_session_cleanup (stream_session_t * s);
527 void session_send_session_evt_to_thread (u64 session_handle,
528 fifo_event_type_t evt_type,
530 ssvm_private_t *session_manager_get_evt_q_segment (void);
532 u8 *format_stream_session (u8 * s, va_list * args);
533 uword unformat_stream_session (unformat_input_t * input, va_list * args);
534 uword unformat_transport_connection (unformat_input_t * input,
537 void session_register_transport (transport_proto_t transport_proto,
538 const transport_proto_vft_t * vft, u8 is_ip4,
541 clib_error_t *vnet_session_enable_disable (vlib_main_t * vm, u8 is_en);
543 always_inline svm_queue_t *
544 session_manager_get_vpp_event_queue (u32 thread_index)
546 return session_manager_main.vpp_event_queues[thread_index];
549 int session_manager_flush_enqueue_events (u8 proto, u32 thread_index);
550 int session_manager_flush_all_enqueue_events (u8 transport_proto);
553 listen_session_get_handle (stream_session_t * s)
555 ASSERT (s->session_state == SESSION_STATE_LISTENING);
556 return session_handle (s);
559 always_inline stream_session_t *
560 listen_session_get_from_handle (session_handle_t handle)
562 return session_get_from_handle (handle);
566 listen_session_parse_handle (session_handle_t handle, u32 * index,
569 session_parse_handle (handle, index, thread_index);
572 always_inline stream_session_t *
573 listen_session_new (u8 thread_index, session_type_t type)
576 s = session_alloc (thread_index);
577 s->session_type = type;
578 s->session_state = SESSION_STATE_LISTENING;
582 always_inline stream_session_t *
583 listen_session_get (u32 index)
585 return session_get (index, 0);
589 listen_session_del (stream_session_t * s)
594 transport_connection_t *listen_session_get_transport (stream_session_t * s);
597 listen_session_get_local_session_endpoint (stream_session_t * listener,
598 session_endpoint_t * sep);
601 session_manager_is_enabled ()
603 return session_manager_main.is_enabled == 1;
606 #define session_cli_return_if_not_enabled() \
608 if (!session_manager_main.is_enabled) \
609 return clib_error_return(0, "session layer is not enabled"); \
612 void session_node_enable_disable (u8 is_en);
614 #endif /* __included_session_h__ */
617 * fd.io coding-style-patch-verification: ON
620 * eval: (c-set-style "gnu")