2 * Copyright (c) 2017-2019 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 <vppinfra/llist.h>
19 #include <vnet/session/session_types.h>
20 #include <vnet/session/session_lookup.h>
21 #include <vnet/session/session_debug.h>
22 #include <svm/message_queue.h>
25 #define foreach_session_input_error \
26 _(NO_SESSION, "No session drops") \
27 _(NO_LISTENER, "No listener for dst port drops") \
28 _(ENQUEUED, "Packets pushed into rx fifo") \
29 _(NOT_READY, "Session not ready packets") \
30 _(FIFO_FULL, "Packets dropped for lack of rx fifo space") \
31 _(EVENT_FIFO_FULL, "Events not sent for lack of event fifo space") \
32 _(API_QUEUE_FULL, "Sessions not created for lack of API queue space") \
33 _(NEW_SEG_NO_SPACE, "Created segment, couldn't allocate a fifo pair") \
34 _(NO_SPACE, "Couldn't allocate a fifo pair") \
35 _(SEG_CREATE, "Couldn't create a new segment")
39 #define _(sym,str) SESSION_ERROR_##sym,
40 foreach_session_input_error
45 typedef struct session_tx_context_
47 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
49 transport_proto_vft_t *transport_vft;
50 transport_connection_t *tc;
56 u16 deq_per_first_buf;
61 CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
62 session_dgram_hdr_t hdr;
63 } session_tx_context_t;
65 typedef struct session_evt_elt
67 clib_llist_anchor_t evt_list;
71 typedef struct session_worker_
73 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
75 /** Worker session pool */
78 /** vpp event message queue for worker */
79 svm_msg_q_t *vpp_event_queue;
81 /** vlib_time_now last time around the track */
84 /** Convenience pointer to this worker's vlib_main */
87 /** Per-proto vector of sessions to enqueue */
88 u32 *session_to_enqueue[TRANSPORT_N_PROTO];
90 /** Context for session tx */
91 session_tx_context_t ctx;
93 /** Vector of tx buffer free lists */
96 /** Pool of session event list elements */
97 session_evt_elt_t *event_elts;
99 /** Head of list of elements */
100 clib_llist_index_t new_head;
102 /** Head of list of pending events */
103 clib_llist_index_t old_head;
105 /** Head of list of postponed events */
106 clib_llist_index_t postponed_head;
108 /** Head of list of disconnect events */
109 clib_llist_index_t disconnects_head;
111 /** Peekers rw lock */
112 clib_rwlock_t peekers_rw_locks;
115 /** last event poll time by thread */
120 typedef int (session_fifo_rx_fn) (session_worker_t * wrk,
121 vlib_node_runtime_t * node,
122 session_evt_elt_t * e, int *n_tx_packets);
124 extern session_fifo_rx_fn session_tx_fifo_peek_and_snd;
125 extern session_fifo_rx_fn session_tx_fifo_dequeue_and_snd;
126 extern session_fifo_rx_fn session_tx_fifo_dequeue_internal;
128 u8 session_node_lookup_fifo_event (svm_fifo_t * f, session_event_t * e);
130 typedef struct session_main_
132 /** Worker contexts */
133 session_worker_t *wrk;
135 /** Event queues memfd segment initialized only if so configured */
136 ssvm_private_t evt_qs_segment;
138 /** Unique segment name counter */
139 u32 unique_segment_name_counter;
141 /** Per transport rx function that can either dequeue or peek */
142 session_fifo_rx_fn **session_tx_fns;
144 /** Per session type output nodes. Could optimize to group nodes by
145 * fib but lookup would then require session type parsing in session node.
146 * Trade memory for speed, for now */
147 u32 *session_type_to_next;
153 /** Session manager is enabled */
156 /** vpp fifo event queue configured length */
157 u32 configured_event_queue_length;
159 /** Session ssvm segment configs*/
160 uword session_baseva;
161 uword session_va_space_size;
162 uword evt_qs_segment_size;
163 u8 evt_qs_use_memfd_seg;
165 /** Session table size parameters */
166 u32 configured_v4_session_table_buckets;
167 u32 configured_v4_session_table_memory;
168 u32 configured_v4_halfopen_table_buckets;
169 u32 configured_v4_halfopen_table_memory;
170 u32 configured_v6_session_table_buckets;
171 u32 configured_v6_session_table_memory;
172 u32 configured_v6_halfopen_table_buckets;
173 u32 configured_v6_halfopen_table_memory;
175 /** Transport table (preallocation) size parameters */
176 u32 local_endpoints_table_memory;
177 u32 local_endpoints_table_buckets;
179 /** Preallocate session config parameter */
180 u32 preallocated_sessions;
184 extern session_main_t session_main;
185 extern vlib_node_registration_t session_queue_node;
186 extern vlib_node_registration_t session_queue_process_node;
187 extern vlib_node_registration_t session_queue_pre_input_node;
189 #define SESSION_Q_PROCESS_FLUSH_FRAMES 1
190 #define SESSION_Q_PROCESS_STOP 2
192 static inline session_evt_elt_t *
193 session_evt_elt_alloc (session_worker_t * wrk)
195 session_evt_elt_t *elt;
196 pool_get (wrk->event_elts, elt);
201 session_evt_elt_free (session_worker_t * wrk, session_evt_elt_t * elt)
203 pool_put (wrk->event_elts, elt);
206 static inline session_evt_elt_t *
207 session_evt_old_head (session_worker_t * wrk)
209 return pool_elt_at_index (wrk->event_elts, wrk->old_head);
212 static inline session_evt_elt_t *
213 session_evt_postponed_head (session_worker_t * wrk)
215 return pool_elt_at_index (wrk->event_elts, wrk->postponed_head);
218 static inline session_evt_elt_t *
219 session_evt_pending_disconnects_head (session_worker_t * wrk)
221 return pool_elt_at_index (wrk->event_elts, wrk->disconnects_head);
225 session_evt_add_old (session_worker_t * wrk, session_evt_elt_t * elt)
227 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
228 session_evt_old_head (wrk));
232 session_evt_add_postponed (session_worker_t * wrk, session_evt_elt_t * elt)
234 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
235 session_evt_postponed_head (wrk));
239 session_evt_add_pending_disconnects (session_worker_t * wrk,
240 session_evt_elt_t * elt)
242 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
243 session_evt_pending_disconnects_head (wrk));
246 static inline session_evt_elt_t *
247 session_evt_alloc_new (session_worker_t * wrk)
249 session_evt_elt_t *elt;
250 elt = session_evt_elt_alloc (wrk);
251 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
252 pool_elt_at_index (wrk->event_elts, wrk->new_head));
256 static inline session_evt_elt_t *
257 session_evt_alloc_old (session_worker_t * wrk)
259 session_evt_elt_t *elt;
260 elt = session_evt_elt_alloc (wrk);
261 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
262 pool_elt_at_index (wrk->event_elts, wrk->old_head));
267 session_is_valid (u32 si, u8 thread_index)
270 s = pool_elt_at_index (session_main.wrk[thread_index].sessions, si);
271 if (s->session_state == SESSION_STATE_CLOSED)
274 if (s->thread_index != thread_index || s->session_index != si)
279 session_t *session_alloc (u32 thread_index);
280 void session_free (session_t * s);
281 void session_free_w_fifos (session_t * s);
283 always_inline session_t *
284 session_get (u32 si, u32 thread_index)
286 ASSERT (session_is_valid (si, thread_index));
287 return pool_elt_at_index (session_main.wrk[thread_index].sessions, si);
290 always_inline session_t *
291 session_get_if_valid (u64 si, u32 thread_index)
293 if (thread_index >= vec_len (session_main.wrk))
296 if (pool_is_free_index (session_main.wrk[thread_index].sessions, si))
299 ASSERT (session_is_valid (si, thread_index));
300 return pool_elt_at_index (session_main.wrk[thread_index].sessions, si);
303 always_inline session_t *
304 session_get_from_handle (session_handle_t handle)
306 session_main_t *smm = &session_main;
307 u32 session_index, thread_index;
308 session_parse_handle (handle, &session_index, &thread_index);
309 return pool_elt_at_index (smm->wrk[thread_index].sessions, session_index);
312 always_inline session_t *
313 session_get_from_handle_if_valid (session_handle_t handle)
315 u32 session_index, thread_index;
316 session_parse_handle (handle, &session_index, &thread_index);
317 return session_get_if_valid (session_index, thread_index);
320 u64 session_segment_handle (session_t * s);
323 * Acquires a lock that blocks a session pool from expanding.
325 * This is typically used for safely peeking into other threads'
326 * pools in order to clone elements. Lock should be dropped as soon
327 * as possible by calling @ref session_pool_remove_peeker.
329 * NOTE: Avoid using pool_elt_at_index while the lock is held because
330 * it may lead to free elt bitmap expansion/contraction!
333 session_pool_add_peeker (u32 thread_index)
335 session_worker_t *wrk = &session_main.wrk[thread_index];
336 if (thread_index == vlib_get_thread_index ())
338 clib_rwlock_reader_lock (&wrk->peekers_rw_locks);
342 session_pool_remove_peeker (u32 thread_index)
344 session_worker_t *wrk = &session_main.wrk[thread_index];
345 if (thread_index == vlib_get_thread_index ())
347 clib_rwlock_reader_unlock (&wrk->peekers_rw_locks);
351 * Get session from handle and 'lock' pool resize if not in same thread
353 * Caller should drop the peek 'lock' as soon as possible.
355 always_inline session_t *
356 session_get_from_handle_safe (u64 handle)
358 u32 thread_index = session_thread_from_handle (handle);
359 session_worker_t *wrk = &session_main.wrk[thread_index];
361 if (thread_index == vlib_get_thread_index ())
363 return pool_elt_at_index (wrk->sessions,
364 session_index_from_handle (handle));
368 session_pool_add_peeker (thread_index);
369 /* Don't use pool_elt_at index. See @ref session_pool_add_peeker */
370 return wrk->sessions + session_index_from_handle (handle);
375 session_get_index (session_t * s)
377 return (s - session_main.wrk[s->thread_index].sessions);
380 always_inline session_t *
381 session_clone_safe (u32 session_index, u32 thread_index)
383 session_t *old_s, *new_s;
384 u32 current_thread_index = vlib_get_thread_index ();
386 /* If during the memcpy pool is reallocated AND the memory allocator
387 * decides to give the old chunk of memory to somebody in a hurry to
388 * scribble something on it, we have a problem. So add this thread as
389 * a session pool peeker.
391 session_pool_add_peeker (thread_index);
392 new_s = session_alloc (current_thread_index);
393 old_s = session_main.wrk[thread_index].sessions + session_index;
394 clib_memcpy_fast (new_s, old_s, sizeof (*new_s));
395 session_pool_remove_peeker (thread_index);
396 new_s->thread_index = current_thread_index;
397 new_s->session_index = session_get_index (new_s);
401 int session_open (u32 app_index, session_endpoint_t * tep, u32 opaque);
402 int session_listen (session_t * s, session_endpoint_cfg_t * sep);
403 int session_stop_listen (session_t * s);
404 void session_close (session_t * s);
405 void session_transport_close (session_t * s);
406 void session_transport_cleanup (session_t * s);
407 int session_send_io_evt_to_thread (svm_fifo_t * f,
408 session_evt_type_t evt_type);
409 int session_enqueue_notify (session_t * s);
410 int session_dequeue_notify (session_t * s);
411 int session_send_io_evt_to_thread_custom (void *data, u32 thread_index,
412 session_evt_type_t evt_type);
413 void session_send_rpc_evt_to_thread (u32 thread_index, void *fp,
415 void session_send_rpc_evt_to_thread_force (u32 thread_index, void *fp,
417 void session_add_self_custom_tx_evt (transport_connection_t * tc,
419 transport_connection_t *session_get_transport (session_t * s);
420 void session_get_endpoint (session_t * s, transport_endpoint_t * tep,
423 u8 *format_session (u8 * s, va_list * args);
424 uword unformat_session (unformat_input_t * input, va_list * args);
425 uword unformat_transport_connection (unformat_input_t * input,
429 * Interface to transport protos
432 int session_enqueue_stream_connection (transport_connection_t * tc,
433 vlib_buffer_t * b, u32 offset,
434 u8 queue_event, u8 is_in_order);
435 int session_enqueue_dgram_connection (session_t * s,
436 session_dgram_hdr_t * hdr,
437 vlib_buffer_t * b, u8 proto,
439 int session_stream_connect_notify (transport_connection_t * tc, u8 is_fail);
440 int session_dgram_connect_notify (transport_connection_t * tc,
441 u32 old_thread_index,
442 session_t ** new_session);
443 int session_stream_accept_notify (transport_connection_t * tc);
444 void session_transport_closing_notify (transport_connection_t * tc);
445 void session_transport_delete_notify (transport_connection_t * tc);
446 void session_transport_closed_notify (transport_connection_t * tc);
447 void session_transport_reset_notify (transport_connection_t * tc);
448 int session_stream_accept (transport_connection_t * tc, u32 listener_index,
449 u32 thread_index, u8 notify);
450 void session_register_transport (transport_proto_t transport_proto,
451 const transport_proto_vft_t * vft, u8 is_ip4,
453 int session_tx_fifo_peek_bytes (transport_connection_t * tc, u8 * buffer,
454 u32 offset, u32 max_bytes);
455 u32 session_tx_fifo_dequeue_drop (transport_connection_t * tc, u32 max_bytes);
458 transport_max_rx_enqueue (transport_connection_t * tc)
460 session_t *s = session_get (tc->s_index, tc->thread_index);
461 return svm_fifo_max_enqueue_prod (s->rx_fifo);
465 transport_max_tx_dequeue (transport_connection_t * tc)
467 session_t *s = session_get (tc->s_index, tc->thread_index);
468 return svm_fifo_max_dequeue_cons (s->tx_fifo);
472 transport_max_rx_dequeue (transport_connection_t * tc)
474 session_t *s = session_get (tc->s_index, tc->thread_index);
475 return svm_fifo_max_dequeue (s->rx_fifo);
479 transport_rx_fifo_size (transport_connection_t * tc)
481 session_t *s = session_get (tc->s_index, tc->thread_index);
482 return s->rx_fifo->nitems;
486 transport_tx_fifo_size (transport_connection_t * tc)
488 session_t *s = session_get (tc->s_index, tc->thread_index);
489 return s->tx_fifo->nitems;
493 transport_rx_fifo_has_ooo_data (transport_connection_t * tc)
495 session_t *s = session_get (tc->c_index, tc->thread_index);
496 return svm_fifo_has_ooo_data (s->rx_fifo);
500 transport_time_now (u32 thread_index)
502 return session_main.wrk[thread_index].last_vlib_time;
506 transport_add_tx_event (transport_connection_t * tc)
508 session_t *s = session_get (tc->s_index, tc->thread_index);
509 if (svm_fifo_has_event (s->tx_fifo))
511 session_send_io_evt_to_thread (s->tx_fifo, SESSION_IO_EVT_TX);
519 listen_session_get_handle (session_t * s)
521 ASSERT (s->session_state == SESSION_STATE_LISTENING ||
522 session_get_transport_proto (s) == TRANSPORT_PROTO_QUIC);
523 return session_handle (s);
526 always_inline session_t *
527 listen_session_get_from_handle (session_handle_t handle)
529 return session_get_from_handle (handle);
533 listen_session_parse_handle (session_handle_t handle, u32 * index,
536 session_parse_handle (handle, index, thread_index);
539 always_inline session_t *
540 listen_session_alloc (u8 thread_index, session_type_t type)
543 s = session_alloc (thread_index);
544 s->session_type = type;
545 s->session_state = SESSION_STATE_LISTENING;
549 always_inline session_t *
550 listen_session_get (u32 ls_index)
552 return session_get (ls_index, 0);
556 listen_session_free (session_t * s)
561 transport_connection_t *listen_session_get_transport (session_t * s);
564 * Session layer functions
567 always_inline session_main_t *
568 vnet_get_session_main ()
570 return &session_main;
573 always_inline session_worker_t *
574 session_main_get_worker (u32 thread_index)
576 return &session_main.wrk[thread_index];
579 always_inline svm_msg_q_t *
580 session_main_get_vpp_event_queue (u32 thread_index)
582 return session_main.wrk[thread_index].vpp_event_queue;
586 session_main_is_enabled ()
588 return session_main.is_enabled == 1;
591 #define session_cli_return_if_not_enabled() \
593 if (!session_main.is_enabled) \
594 return clib_error_return(0, "session layer is not enabled"); \
597 int session_main_flush_enqueue_events (u8 proto, u32 thread_index);
598 int session_main_flush_all_enqueue_events (u8 transport_proto);
599 void session_flush_frames_main_thread (vlib_main_t * vm);
600 ssvm_private_t *session_main_get_evt_q_segment (void);
601 void session_node_enable_disable (u8 is_en);
602 clib_error_t *vnet_session_enable_disable (vlib_main_t * vm, u8 is_en);
604 #endif /* __included_session_h__ */
607 * fd.io coding-style-patch-verification: ON
610 * eval: (c-set-style "gnu")