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;
118 typedef int (session_fifo_rx_fn) (vlib_main_t * vm,
119 vlib_node_runtime_t * node,
120 session_worker_t * wrk,
121 session_evt_elt_t * e, int *n_tx_pkts);
123 extern session_fifo_rx_fn session_tx_fifo_peek_and_snd;
124 extern session_fifo_rx_fn session_tx_fifo_dequeue_and_snd;
125 extern session_fifo_rx_fn session_tx_fifo_dequeue_internal;
127 u8 session_node_lookup_fifo_event (svm_fifo_t * f, session_event_t * e);
129 typedef struct session_main_
131 /** Worker contexts */
132 session_worker_t *wrk;
134 /** Event queues memfd segment initialized only if so configured */
135 ssvm_private_t evt_qs_segment;
137 /** Unique segment name counter */
138 u32 unique_segment_name_counter;
140 /** Per transport rx function that can either dequeue or peek */
141 session_fifo_rx_fn **session_tx_fns;
143 /** Per session type output nodes. Could optimize to group nodes by
144 * fib but lookup would then require session type parsing in session node.
145 * Trade memory for speed, for now */
146 u32 *session_type_to_next;
152 /** Session manager is enabled */
155 /** vpp fifo event queue configured length */
156 u32 configured_event_queue_length;
158 /** Session ssvm segment configs*/
159 uword session_baseva;
160 uword session_va_space_size;
161 uword evt_qs_segment_size;
162 u8 evt_qs_use_memfd_seg;
164 /** Session table size parameters */
165 u32 configured_v4_session_table_buckets;
166 u32 configured_v4_session_table_memory;
167 u32 configured_v4_halfopen_table_buckets;
168 u32 configured_v4_halfopen_table_memory;
169 u32 configured_v6_session_table_buckets;
170 u32 configured_v6_session_table_memory;
171 u32 configured_v6_halfopen_table_buckets;
172 u32 configured_v6_halfopen_table_memory;
174 /** Transport table (preallocation) size parameters */
175 u32 local_endpoints_table_memory;
176 u32 local_endpoints_table_buckets;
178 /** Preallocate session config parameter */
179 u32 preallocated_sessions;
183 * last event poll time by thread
184 * Debug only. Will cause false cache-line sharing as-is
186 f64 *last_event_poll_by_thread;
191 extern session_main_t session_main;
192 extern vlib_node_registration_t session_queue_node;
193 extern vlib_node_registration_t session_queue_process_node;
194 extern vlib_node_registration_t session_queue_pre_input_node;
196 #define SESSION_Q_PROCESS_FLUSH_FRAMES 1
197 #define SESSION_Q_PROCESS_STOP 2
199 static inline session_evt_elt_t *
200 session_evt_elt_alloc (session_worker_t * wrk)
202 session_evt_elt_t *elt;
203 pool_get (wrk->event_elts, elt);
208 session_evt_elt_free (session_worker_t * wrk, session_evt_elt_t * elt)
210 pool_put (wrk->event_elts, elt);
213 static inline session_evt_elt_t *
214 session_evt_pending_head (session_worker_t * wrk)
216 return pool_elt_at_index (wrk->event_elts, wrk->pending_head);
219 static inline session_evt_elt_t *
220 session_evt_postponed_head (session_worker_t * wrk)
222 return pool_elt_at_index (wrk->event_elts, wrk->postponed_head);
225 static inline session_evt_elt_t *
226 session_evt_pending_disconnects_head (session_worker_t * wrk)
228 return pool_elt_at_index (wrk->event_elts, wrk->disconnects_head);
232 session_evt_add_pending (session_worker_t * wrk, session_evt_elt_t * elt)
234 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
235 session_evt_pending_head (wrk));
239 session_evt_add_postponed (session_worker_t * wrk, session_evt_elt_t * elt)
241 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
242 session_evt_postponed_head (wrk));
246 session_evt_add_pending_disconnects (session_worker_t * wrk,
247 session_evt_elt_t * elt)
249 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
250 session_evt_pending_disconnects_head (wrk));
254 session_is_valid (u32 si, u8 thread_index)
257 s = pool_elt_at_index (session_main.wrk[thread_index].sessions, si);
258 if (s->session_state == SESSION_STATE_CLOSED)
261 if (s->thread_index != thread_index || s->session_index != si)
266 session_t *session_alloc (u32 thread_index);
267 void session_free (session_t * s);
268 void session_free_w_fifos (session_t * s);
270 always_inline session_t *
271 session_get (u32 si, u32 thread_index)
273 ASSERT (session_is_valid (si, thread_index));
274 return pool_elt_at_index (session_main.wrk[thread_index].sessions, si);
277 always_inline session_t *
278 session_get_if_valid (u64 si, u32 thread_index)
280 if (thread_index >= vec_len (session_main.wrk))
283 if (pool_is_free_index (session_main.wrk[thread_index].sessions, si))
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_from_handle (session_handle_t handle)
293 session_main_t *smm = &session_main;
294 u32 session_index, thread_index;
295 session_parse_handle (handle, &session_index, &thread_index);
296 return pool_elt_at_index (smm->wrk[thread_index].sessions, session_index);
299 always_inline session_t *
300 session_get_from_handle_if_valid (session_handle_t handle)
302 u32 session_index, thread_index;
303 session_parse_handle (handle, &session_index, &thread_index);
304 return session_get_if_valid (session_index, thread_index);
307 u64 session_segment_handle (session_t * s);
310 * Acquires a lock that blocks a session pool from expanding.
312 * This is typically used for safely peeking into other threads'
313 * pools in order to clone elements. Lock should be dropped as soon
314 * as possible by calling @ref session_pool_remove_peeker.
316 * NOTE: Avoid using pool_elt_at_index while the lock is held because
317 * it may lead to free elt bitmap expansion/contraction!
320 session_pool_add_peeker (u32 thread_index)
322 session_worker_t *wrk = &session_main.wrk[thread_index];
323 if (thread_index == vlib_get_thread_index ())
325 clib_rwlock_reader_lock (&wrk->peekers_rw_locks);
329 session_pool_remove_peeker (u32 thread_index)
331 session_worker_t *wrk = &session_main.wrk[thread_index];
332 if (thread_index == vlib_get_thread_index ())
334 clib_rwlock_reader_unlock (&wrk->peekers_rw_locks);
338 * Get session from handle and 'lock' pool resize if not in same thread
340 * Caller should drop the peek 'lock' as soon as possible.
342 always_inline session_t *
343 session_get_from_handle_safe (u64 handle)
345 u32 thread_index = session_thread_from_handle (handle);
346 session_worker_t *wrk = &session_main.wrk[thread_index];
348 if (thread_index == vlib_get_thread_index ())
350 return pool_elt_at_index (wrk->sessions,
351 session_index_from_handle (handle));
355 session_pool_add_peeker (thread_index);
356 /* Don't use pool_elt_at index. See @ref session_pool_add_peeker */
357 return wrk->sessions + session_index_from_handle (handle);
362 session_get_index (session_t * s)
364 return (s - session_main.wrk[s->thread_index].sessions);
367 always_inline session_t *
368 session_clone_safe (u32 session_index, u32 thread_index)
370 session_t *old_s, *new_s;
371 u32 current_thread_index = vlib_get_thread_index ();
373 /* If during the memcpy pool is reallocated AND the memory allocator
374 * decides to give the old chunk of memory to somebody in a hurry to
375 * scribble something on it, we have a problem. So add this thread as
376 * a session pool peeker.
378 session_pool_add_peeker (thread_index);
379 new_s = session_alloc (current_thread_index);
380 old_s = session_main.wrk[thread_index].sessions + session_index;
381 clib_memcpy_fast (new_s, old_s, sizeof (*new_s));
382 session_pool_remove_peeker (thread_index);
383 new_s->thread_index = current_thread_index;
384 new_s->session_index = session_get_index (new_s);
388 int session_open (u32 app_index, session_endpoint_t * tep, u32 opaque);
389 int session_listen (session_t * s, session_endpoint_cfg_t * sep);
390 int session_stop_listen (session_t * s);
391 void session_close (session_t * s);
392 void session_transport_close (session_t * s);
393 void session_transport_cleanup (session_t * s);
394 int session_send_io_evt_to_thread (svm_fifo_t * f,
395 session_evt_type_t evt_type);
396 int session_enqueue_notify (session_t * s);
397 int session_dequeue_notify (session_t * s);
398 int session_send_io_evt_to_thread_custom (void *data, u32 thread_index,
399 session_evt_type_t evt_type);
400 void session_send_rpc_evt_to_thread (u32 thread_index, void *fp,
402 void session_send_rpc_evt_to_thread_force (u32 thread_index, void *fp,
404 transport_connection_t *session_get_transport (session_t * s);
405 void session_get_endpoint (session_t * s, transport_endpoint_t * tep,
408 u8 *format_session (u8 * s, va_list * args);
409 uword unformat_session (unformat_input_t * input, va_list * args);
410 uword unformat_transport_connection (unformat_input_t * input,
414 * Interface to transport protos
417 int session_enqueue_stream_connection (transport_connection_t * tc,
418 vlib_buffer_t * b, u32 offset,
419 u8 queue_event, u8 is_in_order);
420 int session_enqueue_dgram_connection (session_t * s,
421 session_dgram_hdr_t * hdr,
422 vlib_buffer_t * b, u8 proto,
424 int session_stream_connect_notify (transport_connection_t * tc, u8 is_fail);
425 int session_dgram_connect_notify (transport_connection_t * tc,
426 u32 old_thread_index,
427 session_t ** new_session);
428 int session_stream_accept_notify (transport_connection_t * tc);
429 void session_transport_closing_notify (transport_connection_t * tc);
430 void session_transport_delete_notify (transport_connection_t * tc);
431 void session_transport_closed_notify (transport_connection_t * tc);
432 void session_transport_reset_notify (transport_connection_t * tc);
433 int session_stream_accept (transport_connection_t * tc, u32 listener_index,
434 u32 thread_index, u8 notify);
435 void session_register_transport (transport_proto_t transport_proto,
436 const transport_proto_vft_t * vft, u8 is_ip4,
438 int session_tx_fifo_peek_bytes (transport_connection_t * tc, u8 * buffer,
439 u32 offset, u32 max_bytes);
440 u32 session_tx_fifo_dequeue_drop (transport_connection_t * tc, u32 max_bytes);
443 transport_max_rx_enqueue (transport_connection_t * tc)
445 session_t *s = session_get (tc->s_index, tc->thread_index);
446 return svm_fifo_max_enqueue_prod (s->rx_fifo);
450 transport_max_tx_dequeue (transport_connection_t * tc)
452 session_t *s = session_get (tc->s_index, tc->thread_index);
453 return svm_fifo_max_dequeue_cons (s->tx_fifo);
457 transport_max_rx_dequeue (transport_connection_t * tc)
459 session_t *s = session_get (tc->s_index, tc->thread_index);
460 return svm_fifo_max_dequeue (s->rx_fifo);
464 transport_rx_fifo_size (transport_connection_t * tc)
466 session_t *s = session_get (tc->s_index, tc->thread_index);
467 return s->rx_fifo->nitems;
471 transport_tx_fifo_size (transport_connection_t * tc)
473 session_t *s = session_get (tc->s_index, tc->thread_index);
474 return s->tx_fifo->nitems;
478 transport_rx_fifo_has_ooo_data (transport_connection_t * tc)
480 session_t *s = session_get (tc->c_index, tc->thread_index);
481 return svm_fifo_has_ooo_data (s->rx_fifo);
485 transport_dispatch_period (u32 thread_index)
487 return session_main.wrk[thread_index].dispatch_period;
491 transport_time_now (u32 thread_index)
493 return session_main.wrk[thread_index].last_vlib_time;
497 transport_add_tx_event (transport_connection_t * tc)
499 session_t *s = session_get (tc->s_index, tc->thread_index);
500 if (svm_fifo_has_event (s->tx_fifo))
502 session_send_io_evt_to_thread (s->tx_fifo, SESSION_IO_EVT_TX);
510 listen_session_get_handle (session_t * s)
512 ASSERT (s->session_state == SESSION_STATE_LISTENING ||
513 session_get_transport_proto (s) == TRANSPORT_PROTO_QUIC);
514 return session_handle (s);
517 always_inline session_t *
518 listen_session_get_from_handle (session_handle_t handle)
520 return session_get_from_handle (handle);
524 listen_session_parse_handle (session_handle_t handle, u32 * index,
527 session_parse_handle (handle, index, thread_index);
530 always_inline session_t *
531 listen_session_alloc (u8 thread_index, session_type_t type)
534 s = session_alloc (thread_index);
535 s->session_type = type;
536 s->session_state = SESSION_STATE_LISTENING;
540 always_inline session_t *
541 listen_session_get (u32 ls_index)
543 return session_get (ls_index, 0);
547 listen_session_free (session_t * s)
552 transport_connection_t *listen_session_get_transport (session_t * s);
555 * Session layer functions
558 always_inline session_main_t *
559 vnet_get_session_main ()
561 return &session_main;
564 always_inline session_worker_t *
565 session_main_get_worker (u32 thread_index)
567 return &session_main.wrk[thread_index];
570 always_inline svm_msg_q_t *
571 session_main_get_vpp_event_queue (u32 thread_index)
573 return session_main.wrk[thread_index].vpp_event_queue;
577 session_main_is_enabled ()
579 return session_main.is_enabled == 1;
582 #define session_cli_return_if_not_enabled() \
584 if (!session_main.is_enabled) \
585 return clib_error_return(0, "session layer is not enabled"); \
588 int session_main_flush_enqueue_events (u8 proto, u32 thread_index);
589 int session_main_flush_all_enqueue_events (u8 transport_proto);
590 void session_flush_frames_main_thread (vlib_main_t * vm);
591 ssvm_private_t *session_main_get_evt_q_segment (void);
592 void session_node_enable_disable (u8 is_en);
593 clib_error_t *vnet_session_enable_disable (vlib_main_t * vm, u8 is_en);
595 #endif /* __included_session_h__ */
598 * fd.io coding-style-patch-verification: ON
601 * eval: (c-set-style "gnu")