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 <vnet/session/session_types.h>
19 #include <vnet/session/session_lookup.h>
20 #include <vnet/session/session_debug.h>
21 #include <svm/message_queue.h>
24 #define SESSION_PROXY_LISTENER_INDEX ((u8)~0 - 1)
26 #define foreach_session_input_error \
27 _(NO_SESSION, "No session drops") \
28 _(NO_LISTENER, "No listener for dst port drops") \
29 _(ENQUEUED, "Packets pushed into rx fifo") \
30 _(NOT_READY, "Session not ready packets") \
31 _(FIFO_FULL, "Packets dropped for lack of rx fifo space") \
32 _(EVENT_FIFO_FULL, "Events not sent for lack of event fifo space") \
33 _(API_QUEUE_FULL, "Sessions not created for lack of API queue space") \
34 _(NEW_SEG_NO_SPACE, "Created segment, couldn't allocate a fifo pair") \
35 _(NO_SPACE, "Couldn't allocate a fifo pair") \
36 _(SEG_CREATE, "Couldn't create a new segment")
40 #define _(sym,str) SESSION_ERROR_##sym,
41 foreach_session_input_error
46 typedef struct session_tx_context_
48 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
50 transport_proto_vft_t *transport_vft;
51 transport_connection_t *tc;
58 u16 deq_per_first_buf;
63 CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
64 session_dgram_hdr_t hdr;
65 } session_tx_context_t;
67 typedef struct session_worker_
69 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
71 /** Worker session pool */
74 /** vpp event message queue for worker */
75 svm_msg_q_t *vpp_event_queue;
77 /** Our approximation of a "complete" dispatch loop period */
80 /** vlib_time_now last time around the track */
83 /** Per-proto enqueue epoch counters */
84 u64 current_enqueue_epoch[TRANSPORT_N_PROTO];
86 /** Per-proto vector of sessions to enqueue */
87 u32 *session_to_enqueue[TRANSPORT_N_PROTO];
89 /** Context for session tx */
90 session_tx_context_t ctx;
92 /** Vector of tx buffer free lists */
95 /** Vector of partially read events */
96 session_event_t *free_event_vector;
98 /** Vector of active event vectors */
99 session_event_t *pending_event_vector;
101 /** Vector of postponed disconnects */
102 session_event_t *pending_disconnects;
104 /** Vector of postponed events */
105 session_event_t *postponed_event_vector;
107 /** Peekers rw lock */
108 clib_rwlock_t peekers_rw_locks;
114 typedef int (session_fifo_rx_fn) (vlib_main_t * vm,
115 vlib_node_runtime_t * node,
116 session_worker_t * wrk,
117 session_event_t * e, int *n_tx_pkts);
119 extern session_fifo_rx_fn session_tx_fifo_peek_and_snd;
120 extern session_fifo_rx_fn session_tx_fifo_dequeue_and_snd;
121 extern session_fifo_rx_fn session_tx_fifo_dequeue_internal;
123 u8 session_node_lookup_fifo_event (svm_fifo_t * f, session_event_t * e);
125 typedef struct session_main_
127 /** Worker contexts */
128 session_worker_t *wrk;
130 /** Event queues memfd segment initialized only if so configured */
131 ssvm_private_t evt_qs_segment;
133 /** Unique segment name counter */
134 u32 unique_segment_name_counter;
136 /** Per transport rx function that can either dequeue or peek */
137 session_fifo_rx_fn **session_tx_fns;
139 /** Per session type output nodes. Could optimize to group nodes by
140 * fib but lookup would then require session type parsing in session node.
141 * Trade memory for speed, for now */
142 u32 *session_type_to_next;
148 /** Session manager is enabled */
151 /** vpp fifo event queue configured length */
152 u32 configured_event_queue_length;
154 /** Session ssvm segment configs*/
155 uword session_baseva;
156 uword session_va_space_size;
157 uword evt_qs_segment_size;
158 u8 evt_qs_use_memfd_seg;
160 /** Session table size parameters */
161 u32 configured_v4_session_table_buckets;
162 u32 configured_v4_session_table_memory;
163 u32 configured_v4_halfopen_table_buckets;
164 u32 configured_v4_halfopen_table_memory;
165 u32 configured_v6_session_table_buckets;
166 u32 configured_v6_session_table_memory;
167 u32 configured_v6_halfopen_table_buckets;
168 u32 configured_v6_halfopen_table_memory;
170 /** Transport table (preallocation) size parameters */
171 u32 local_endpoints_table_memory;
172 u32 local_endpoints_table_buckets;
174 /** Preallocate session config parameter */
175 u32 preallocated_sessions;
179 * last event poll time by thread
180 * Debug only. Will cause false cache-line sharing as-is
182 f64 *last_event_poll_by_thread;
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
196 session_is_valid (u32 si, u8 thread_index)
199 s = pool_elt_at_index (session_main.wrk[thread_index].sessions, si);
200 if (s->session_state == SESSION_STATE_CLOSED)
203 if (s->thread_index != thread_index || s->session_index != si)
208 session_t *session_alloc (u32 thread_index);
209 void session_free (session_t * s);
210 void session_free_w_fifos (session_t * s);
212 always_inline session_t *
213 session_get (u32 si, u32 thread_index)
215 ASSERT (session_is_valid (si, thread_index));
216 return pool_elt_at_index (session_main.wrk[thread_index].sessions, si);
219 always_inline session_t *
220 session_get_if_valid (u64 si, u32 thread_index)
222 if (thread_index >= vec_len (session_main.wrk))
225 if (pool_is_free_index (session_main.wrk[thread_index].sessions, si))
228 ASSERT (session_is_valid (si, thread_index));
229 return pool_elt_at_index (session_main.wrk[thread_index].sessions, si);
232 always_inline session_t *
233 session_get_from_handle (session_handle_t handle)
235 session_main_t *smm = &session_main;
236 u32 session_index, thread_index;
237 session_parse_handle (handle, &session_index, &thread_index);
238 return pool_elt_at_index (smm->wrk[thread_index].sessions, session_index);
241 always_inline session_t *
242 session_get_from_handle_if_valid (session_handle_t handle)
244 u32 session_index, thread_index;
245 session_parse_handle (handle, &session_index, &thread_index);
246 return session_get_if_valid (session_index, thread_index);
249 u64 session_segment_handle (session_t * s);
252 * Acquires a lock that blocks a session pool from expanding.
254 * This is typically used for safely peeking into other threads'
255 * pools in order to clone elements. Lock should be dropped as soon
256 * as possible by calling @ref session_pool_remove_peeker.
258 * NOTE: Avoid using pool_elt_at_index while the lock is held because
259 * it may lead to free elt bitmap expansion/contraction!
262 session_pool_add_peeker (u32 thread_index)
264 session_worker_t *wrk = &session_main.wrk[thread_index];
265 if (thread_index == vlib_get_thread_index ())
267 clib_rwlock_reader_lock (&wrk->peekers_rw_locks);
271 session_pool_remove_peeker (u32 thread_index)
273 session_worker_t *wrk = &session_main.wrk[thread_index];
274 if (thread_index == vlib_get_thread_index ())
276 clib_rwlock_reader_unlock (&wrk->peekers_rw_locks);
280 * Get session from handle and 'lock' pool resize if not in same thread
282 * Caller should drop the peek 'lock' as soon as possible.
284 always_inline session_t *
285 session_get_from_handle_safe (u64 handle)
287 u32 thread_index = session_thread_from_handle (handle);
288 session_worker_t *wrk = &session_main.wrk[thread_index];
290 if (thread_index == vlib_get_thread_index ())
292 return pool_elt_at_index (wrk->sessions,
293 session_index_from_handle (handle));
297 session_pool_add_peeker (thread_index);
298 /* Don't use pool_elt_at index. See @ref session_pool_add_peeker */
299 return wrk->sessions + session_index_from_handle (handle);
304 session_get_index (session_t * s)
306 return (s - session_main.wrk[s->thread_index].sessions);
309 always_inline session_t *
310 session_clone_safe (u32 session_index, u32 thread_index)
312 session_t *old_s, *new_s;
313 u32 current_thread_index = vlib_get_thread_index ();
315 /* If during the memcpy pool is reallocated AND the memory allocator
316 * decides to give the old chunk of memory to somebody in a hurry to
317 * scribble something on it, we have a problem. So add this thread as
318 * a session pool peeker.
320 session_pool_add_peeker (thread_index);
321 new_s = session_alloc (current_thread_index);
322 old_s = session_main.wrk[thread_index].sessions + session_index;
323 clib_memcpy_fast (new_s, old_s, sizeof (*new_s));
324 session_pool_remove_peeker (thread_index);
325 new_s->thread_index = current_thread_index;
326 new_s->session_index = session_get_index (new_s);
330 int session_open (u32 app_index, session_endpoint_t * tep, u32 opaque);
331 int session_listen (session_t * s, session_endpoint_cfg_t * sep);
332 int session_stop_listen (session_t * s);
333 void session_close (session_t * s);
334 void session_transport_close (session_t * s);
335 void session_transport_cleanup (session_t * s);
336 int session_send_io_evt_to_thread (svm_fifo_t * f,
337 session_evt_type_t evt_type);
338 int session_enqueue_notify (session_t * s);
339 int session_dequeue_notify (session_t * s);
340 int session_send_io_evt_to_thread_custom (void *data, u32 thread_index,
341 session_evt_type_t evt_type);
342 void session_send_rpc_evt_to_thread (u32 thread_index, void *fp,
344 transport_connection_t *session_get_transport (session_t * s);
347 u8 *format_session (u8 * s, va_list * args);
348 uword unformat_session (unformat_input_t * input, va_list * args);
349 uword unformat_transport_connection (unformat_input_t * input,
353 * Interface to transport protos
356 int session_enqueue_stream_connection (transport_connection_t * tc,
357 vlib_buffer_t * b, u32 offset,
358 u8 queue_event, u8 is_in_order);
359 int session_enqueue_dgram_connection (session_t * s,
360 session_dgram_hdr_t * hdr,
361 vlib_buffer_t * b, u8 proto,
363 int session_stream_connect_notify (transport_connection_t * tc, u8 is_fail);
364 int session_dgram_connect_notify (transport_connection_t * tc,
365 u32 old_thread_index,
366 session_t ** new_session);
367 int session_stream_accept_notify (transport_connection_t * tc);
368 void session_transport_closing_notify (transport_connection_t * tc);
369 void session_transport_delete_notify (transport_connection_t * tc);
370 void session_transport_closed_notify (transport_connection_t * tc);
371 void session_transport_reset_notify (transport_connection_t * tc);
372 int session_stream_accept (transport_connection_t * tc, u32 listener_index,
374 void session_register_transport (transport_proto_t transport_proto,
375 const transport_proto_vft_t * vft, u8 is_ip4,
377 int session_tx_fifo_peek_bytes (transport_connection_t * tc, u8 * buffer,
378 u32 offset, u32 max_bytes);
379 u32 session_tx_fifo_dequeue_drop (transport_connection_t * tc, u32 max_bytes);
382 transport_max_rx_enqueue (transport_connection_t * tc)
384 session_t *s = session_get (tc->s_index, tc->thread_index);
385 return svm_fifo_max_enqueue (s->rx_fifo);
389 transport_max_tx_dequeue (transport_connection_t * tc)
391 session_t *s = session_get (tc->s_index, tc->thread_index);
392 return svm_fifo_max_dequeue (s->tx_fifo);
396 transport_rx_fifo_size (transport_connection_t * tc)
398 session_t *s = session_get (tc->s_index, tc->thread_index);
399 return s->rx_fifo->nitems;
403 transport_tx_fifo_size (transport_connection_t * tc)
405 session_t *s = session_get (tc->s_index, tc->thread_index);
406 return s->tx_fifo->nitems;
410 transport_rx_fifo_has_ooo_data (transport_connection_t * tc)
412 session_t *s = session_get (tc->c_index, tc->thread_index);
413 return svm_fifo_has_ooo_data (s->rx_fifo);
417 transport_dispatch_period (u32 thread_index)
419 return session_main.wrk[thread_index].dispatch_period;
423 transport_time_now (u32 thread_index)
425 return session_main.wrk[thread_index].last_vlib_time;
429 transport_add_tx_event (transport_connection_t * tc)
431 session_t *s = session_get (tc->s_index, tc->thread_index);
432 if (svm_fifo_has_event (s->tx_fifo))
434 session_send_io_evt_to_thread (s->tx_fifo, SESSION_IO_EVT_TX);
442 listen_session_get_handle (session_t * s)
444 ASSERT (s->session_state == SESSION_STATE_LISTENING);
445 return session_handle (s);
448 always_inline session_t *
449 listen_session_get_from_handle (session_handle_t handle)
451 return session_get_from_handle (handle);
455 listen_session_parse_handle (session_handle_t handle, u32 * index,
458 session_parse_handle (handle, index, thread_index);
461 always_inline session_t *
462 listen_session_alloc (u8 thread_index, session_type_t type)
465 s = session_alloc (thread_index);
466 s->session_type = type;
467 s->session_state = SESSION_STATE_LISTENING;
471 always_inline session_t *
472 listen_session_get (u32 ls_index)
474 return session_get (ls_index, 0);
478 listen_session_free (session_t * s)
483 transport_connection_t *listen_session_get_transport (session_t * s);
486 * Session layer functions
489 always_inline session_main_t *
490 vnet_get_session_main ()
492 return &session_main;
495 always_inline session_worker_t *
496 session_main_get_worker (u32 thread_index)
498 return &session_main.wrk[thread_index];
501 always_inline svm_msg_q_t *
502 session_main_get_vpp_event_queue (u32 thread_index)
504 return session_main.wrk[thread_index].vpp_event_queue;
508 session_main_is_enabled ()
510 return session_main.is_enabled == 1;
513 #define session_cli_return_if_not_enabled() \
515 if (!session_main.is_enabled) \
516 return clib_error_return(0, "session layer is not enabled"); \
519 int session_main_flush_enqueue_events (u8 proto, u32 thread_index);
520 int session_main_flush_all_enqueue_events (u8 transport_proto);
521 void session_flush_frames_main_thread (vlib_main_t * vm);
522 ssvm_private_t *session_main_get_evt_q_segment (void);
523 void session_node_enable_disable (u8 is_en);
524 clib_error_t *vnet_session_enable_disable (vlib_main_t * vm, u8 is_en);
526 #endif /* __included_session_h__ */
529 * fd.io coding-style-patch-verification: ON
532 * eval: (c-set-style "gnu")