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 /** Our approximation of a "complete" dispatch loop period */
84 /** vlib_time_now last time around the track */
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 pending_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;
117 /** last event poll time by thread */
122 typedef int (session_fifo_rx_fn) (vlib_main_t * vm,
123 vlib_node_runtime_t * node,
124 session_worker_t * wrk,
125 session_evt_elt_t * e, int *n_tx_pkts);
127 extern session_fifo_rx_fn session_tx_fifo_peek_and_snd;
128 extern session_fifo_rx_fn session_tx_fifo_dequeue_and_snd;
129 extern session_fifo_rx_fn session_tx_fifo_dequeue_internal;
131 u8 session_node_lookup_fifo_event (svm_fifo_t * f, session_event_t * e);
133 typedef struct session_main_
135 /** Worker contexts */
136 session_worker_t *wrk;
138 /** Event queues memfd segment initialized only if so configured */
139 ssvm_private_t evt_qs_segment;
141 /** Unique segment name counter */
142 u32 unique_segment_name_counter;
144 /** Per transport rx function that can either dequeue or peek */
145 session_fifo_rx_fn **session_tx_fns;
147 /** Per session type output nodes. Could optimize to group nodes by
148 * fib but lookup would then require session type parsing in session node.
149 * Trade memory for speed, for now */
150 u32 *session_type_to_next;
156 /** Session manager is enabled */
159 /** vpp fifo event queue configured length */
160 u32 configured_event_queue_length;
162 /** Session ssvm segment configs*/
163 uword session_baseva;
164 uword session_va_space_size;
165 uword evt_qs_segment_size;
166 u8 evt_qs_use_memfd_seg;
168 /** Session table size parameters */
169 u32 configured_v4_session_table_buckets;
170 u32 configured_v4_session_table_memory;
171 u32 configured_v4_halfopen_table_buckets;
172 u32 configured_v4_halfopen_table_memory;
173 u32 configured_v6_session_table_buckets;
174 u32 configured_v6_session_table_memory;
175 u32 configured_v6_halfopen_table_buckets;
176 u32 configured_v6_halfopen_table_memory;
178 /** Transport table (preallocation) size parameters */
179 u32 local_endpoints_table_memory;
180 u32 local_endpoints_table_buckets;
182 /** Preallocate session config parameter */
183 u32 preallocated_sessions;
187 extern session_main_t session_main;
188 extern vlib_node_registration_t session_queue_node;
189 extern vlib_node_registration_t session_queue_process_node;
190 extern vlib_node_registration_t session_queue_pre_input_node;
192 #define SESSION_Q_PROCESS_FLUSH_FRAMES 1
193 #define SESSION_Q_PROCESS_STOP 2
195 static inline session_evt_elt_t *
196 session_evt_elt_alloc (session_worker_t * wrk)
198 session_evt_elt_t *elt;
199 pool_get (wrk->event_elts, elt);
204 session_evt_elt_free (session_worker_t * wrk, session_evt_elt_t * elt)
206 pool_put (wrk->event_elts, elt);
209 static inline session_evt_elt_t *
210 session_evt_pending_head (session_worker_t * wrk)
212 return pool_elt_at_index (wrk->event_elts, wrk->pending_head);
215 static inline session_evt_elt_t *
216 session_evt_postponed_head (session_worker_t * wrk)
218 return pool_elt_at_index (wrk->event_elts, wrk->postponed_head);
221 static inline session_evt_elt_t *
222 session_evt_pending_disconnects_head (session_worker_t * wrk)
224 return pool_elt_at_index (wrk->event_elts, wrk->disconnects_head);
228 session_evt_add_pending (session_worker_t * wrk, session_evt_elt_t * elt)
230 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
231 session_evt_pending_head (wrk));
235 session_evt_add_postponed (session_worker_t * wrk, session_evt_elt_t * elt)
237 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
238 session_evt_postponed_head (wrk));
242 session_evt_add_pending_disconnects (session_worker_t * wrk,
243 session_evt_elt_t * elt)
245 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
246 session_evt_pending_disconnects_head (wrk));
250 session_is_valid (u32 si, u8 thread_index)
253 s = pool_elt_at_index (session_main.wrk[thread_index].sessions, si);
254 if (s->session_state == SESSION_STATE_CLOSED)
257 if (s->thread_index != thread_index || s->session_index != si)
262 session_t *session_alloc (u32 thread_index);
263 void session_free (session_t * s);
264 void session_free_w_fifos (session_t * s);
266 always_inline session_t *
267 session_get (u32 si, u32 thread_index)
269 ASSERT (session_is_valid (si, thread_index));
270 return pool_elt_at_index (session_main.wrk[thread_index].sessions, si);
273 always_inline session_t *
274 session_get_if_valid (u64 si, u32 thread_index)
276 if (thread_index >= vec_len (session_main.wrk))
279 if (pool_is_free_index (session_main.wrk[thread_index].sessions, si))
282 ASSERT (session_is_valid (si, thread_index));
283 return pool_elt_at_index (session_main.wrk[thread_index].sessions, si);
286 always_inline session_t *
287 session_get_from_handle (session_handle_t handle)
289 session_main_t *smm = &session_main;
290 u32 session_index, thread_index;
291 session_parse_handle (handle, &session_index, &thread_index);
292 return pool_elt_at_index (smm->wrk[thread_index].sessions, session_index);
295 always_inline session_t *
296 session_get_from_handle_if_valid (session_handle_t handle)
298 u32 session_index, thread_index;
299 session_parse_handle (handle, &session_index, &thread_index);
300 return session_get_if_valid (session_index, thread_index);
303 u64 session_segment_handle (session_t * s);
306 * Acquires a lock that blocks a session pool from expanding.
308 * This is typically used for safely peeking into other threads'
309 * pools in order to clone elements. Lock should be dropped as soon
310 * as possible by calling @ref session_pool_remove_peeker.
312 * NOTE: Avoid using pool_elt_at_index while the lock is held because
313 * it may lead to free elt bitmap expansion/contraction!
316 session_pool_add_peeker (u32 thread_index)
318 session_worker_t *wrk = &session_main.wrk[thread_index];
319 if (thread_index == vlib_get_thread_index ())
321 clib_rwlock_reader_lock (&wrk->peekers_rw_locks);
325 session_pool_remove_peeker (u32 thread_index)
327 session_worker_t *wrk = &session_main.wrk[thread_index];
328 if (thread_index == vlib_get_thread_index ())
330 clib_rwlock_reader_unlock (&wrk->peekers_rw_locks);
334 * Get session from handle and 'lock' pool resize if not in same thread
336 * Caller should drop the peek 'lock' as soon as possible.
338 always_inline session_t *
339 session_get_from_handle_safe (u64 handle)
341 u32 thread_index = session_thread_from_handle (handle);
342 session_worker_t *wrk = &session_main.wrk[thread_index];
344 if (thread_index == vlib_get_thread_index ())
346 return pool_elt_at_index (wrk->sessions,
347 session_index_from_handle (handle));
351 session_pool_add_peeker (thread_index);
352 /* Don't use pool_elt_at index. See @ref session_pool_add_peeker */
353 return wrk->sessions + session_index_from_handle (handle);
358 session_get_index (session_t * s)
360 return (s - session_main.wrk[s->thread_index].sessions);
363 always_inline session_t *
364 session_clone_safe (u32 session_index, u32 thread_index)
366 session_t *old_s, *new_s;
367 u32 current_thread_index = vlib_get_thread_index ();
369 /* If during the memcpy pool is reallocated AND the memory allocator
370 * decides to give the old chunk of memory to somebody in a hurry to
371 * scribble something on it, we have a problem. So add this thread as
372 * a session pool peeker.
374 session_pool_add_peeker (thread_index);
375 new_s = session_alloc (current_thread_index);
376 old_s = session_main.wrk[thread_index].sessions + session_index;
377 clib_memcpy_fast (new_s, old_s, sizeof (*new_s));
378 session_pool_remove_peeker (thread_index);
379 new_s->thread_index = current_thread_index;
380 new_s->session_index = session_get_index (new_s);
384 int session_open (u32 app_index, session_endpoint_t * tep, u32 opaque);
385 int session_listen (session_t * s, session_endpoint_cfg_t * sep);
386 int session_stop_listen (session_t * s);
387 void session_close (session_t * s);
388 void session_transport_close (session_t * s);
389 void session_transport_cleanup (session_t * s);
390 int session_send_io_evt_to_thread (svm_fifo_t * f,
391 session_evt_type_t evt_type);
392 int session_enqueue_notify (session_t * s);
393 int session_dequeue_notify (session_t * s);
394 int session_send_io_evt_to_thread_custom (void *data, u32 thread_index,
395 session_evt_type_t evt_type);
396 void session_send_rpc_evt_to_thread (u32 thread_index, void *fp,
398 void session_send_rpc_evt_to_thread_force (u32 thread_index, void *fp,
400 transport_connection_t *session_get_transport (session_t * s);
401 void session_get_endpoint (session_t * s, transport_endpoint_t * tep,
404 u8 *format_session (u8 * s, va_list * args);
405 uword unformat_session (unformat_input_t * input, va_list * args);
406 uword unformat_transport_connection (unformat_input_t * input,
410 * Interface to transport protos
413 int 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 (session_t * s,
417 session_dgram_hdr_t * hdr,
418 vlib_buffer_t * b, u8 proto,
420 int session_stream_connect_notify (transport_connection_t * tc, u8 is_fail);
421 int session_dgram_connect_notify (transport_connection_t * tc,
422 u32 old_thread_index,
423 session_t ** new_session);
424 int session_stream_accept_notify (transport_connection_t * tc);
425 void session_transport_closing_notify (transport_connection_t * tc);
426 void session_transport_delete_notify (transport_connection_t * tc);
427 void session_transport_closed_notify (transport_connection_t * tc);
428 void session_transport_reset_notify (transport_connection_t * tc);
429 int session_stream_accept (transport_connection_t * tc, u32 listener_index,
430 u32 thread_index, u8 notify);
431 void session_register_transport (transport_proto_t transport_proto,
432 const transport_proto_vft_t * vft, u8 is_ip4,
434 int session_tx_fifo_peek_bytes (transport_connection_t * tc, u8 * buffer,
435 u32 offset, u32 max_bytes);
436 u32 session_tx_fifo_dequeue_drop (transport_connection_t * tc, u32 max_bytes);
439 transport_max_rx_enqueue (transport_connection_t * tc)
441 session_t *s = session_get (tc->s_index, tc->thread_index);
442 return svm_fifo_max_enqueue_prod (s->rx_fifo);
446 transport_max_tx_dequeue (transport_connection_t * tc)
448 session_t *s = session_get (tc->s_index, tc->thread_index);
449 return svm_fifo_max_dequeue_cons (s->tx_fifo);
453 transport_max_rx_dequeue (transport_connection_t * tc)
455 session_t *s = session_get (tc->s_index, tc->thread_index);
456 return svm_fifo_max_dequeue (s->rx_fifo);
460 transport_rx_fifo_size (transport_connection_t * tc)
462 session_t *s = session_get (tc->s_index, tc->thread_index);
463 return s->rx_fifo->nitems;
467 transport_tx_fifo_size (transport_connection_t * tc)
469 session_t *s = session_get (tc->s_index, tc->thread_index);
470 return s->tx_fifo->nitems;
474 transport_rx_fifo_has_ooo_data (transport_connection_t * tc)
476 session_t *s = session_get (tc->c_index, tc->thread_index);
477 return svm_fifo_has_ooo_data (s->rx_fifo);
481 transport_dispatch_period (u32 thread_index)
483 return session_main.wrk[thread_index].dispatch_period;
487 transport_time_now (u32 thread_index)
489 return session_main.wrk[thread_index].last_vlib_time;
493 transport_add_tx_event (transport_connection_t * tc)
495 session_t *s = session_get (tc->s_index, tc->thread_index);
496 if (svm_fifo_has_event (s->tx_fifo))
498 session_send_io_evt_to_thread (s->tx_fifo, SESSION_IO_EVT_TX);
506 listen_session_get_handle (session_t * s)
508 ASSERT (s->session_state == SESSION_STATE_LISTENING ||
509 session_get_transport_proto (s) == TRANSPORT_PROTO_QUIC);
510 return session_handle (s);
513 always_inline session_t *
514 listen_session_get_from_handle (session_handle_t handle)
516 return session_get_from_handle (handle);
520 listen_session_parse_handle (session_handle_t handle, u32 * index,
523 session_parse_handle (handle, index, thread_index);
526 always_inline session_t *
527 listen_session_alloc (u8 thread_index, session_type_t type)
530 s = session_alloc (thread_index);
531 s->session_type = type;
532 s->session_state = SESSION_STATE_LISTENING;
536 always_inline session_t *
537 listen_session_get (u32 ls_index)
539 return session_get (ls_index, 0);
543 listen_session_free (session_t * s)
548 transport_connection_t *listen_session_get_transport (session_t * s);
551 * Session layer functions
554 always_inline session_main_t *
555 vnet_get_session_main ()
557 return &session_main;
560 always_inline session_worker_t *
561 session_main_get_worker (u32 thread_index)
563 return &session_main.wrk[thread_index];
566 always_inline svm_msg_q_t *
567 session_main_get_vpp_event_queue (u32 thread_index)
569 return session_main.wrk[thread_index].vpp_event_queue;
573 session_main_is_enabled ()
575 return session_main.is_enabled == 1;
578 #define session_cli_return_if_not_enabled() \
580 if (!session_main.is_enabled) \
581 return clib_error_return(0, "session layer is not enabled"); \
584 int session_main_flush_enqueue_events (u8 proto, u32 thread_index);
585 int session_main_flush_all_enqueue_events (u8 transport_proto);
586 void session_flush_frames_main_thread (vlib_main_t * vm);
587 ssvm_private_t *session_main_get_evt_q_segment (void);
588 void session_node_enable_disable (u8 is_en);
589 clib_error_t *vnet_session_enable_disable (vlib_main_t * vm, u8 is_en);
591 #endif /* __included_session_h__ */
594 * fd.io coding-style-patch-verification: ON
597 * eval: (c-set-style "gnu")