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_ctrl_evt_data_
73 u8 data[SESSION_CTRL_MSG_MAX_SIZE];
74 } session_evt_ctrl_data_t;
76 typedef struct session_worker_
78 CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
80 /** Worker session pool */
83 /** vpp event message queue for worker */
84 svm_msg_q_t *vpp_event_queue;
86 /** vlib_time_now last time around the track */
89 /** Convenience pointer to this worker's vlib_main */
92 /** Per-proto vector of sessions to enqueue */
93 u32 *session_to_enqueue[TRANSPORT_N_PROTO];
95 /** Context for session tx */
96 session_tx_context_t ctx;
98 /** Vector of tx buffer free lists */
101 /** Pool of session event list elements */
102 session_evt_elt_t *event_elts;
104 /** Pool of ctrl events data buffers */
105 session_evt_ctrl_data_t *ctrl_evts_data;
107 /** Head of control events list */
108 clib_llist_index_t ctrl_head;
110 /** Head of list of elements */
111 clib_llist_index_t new_head;
113 /** Head of list of pending events */
114 clib_llist_index_t old_head;
116 /** Peekers rw lock */
117 clib_rwlock_t peekers_rw_locks;
120 /** last event poll time by thread */
125 typedef int (session_fifo_rx_fn) (session_worker_t * wrk,
126 vlib_node_runtime_t * node,
127 session_evt_elt_t * e, int *n_tx_packets);
129 extern session_fifo_rx_fn session_tx_fifo_peek_and_snd;
130 extern session_fifo_rx_fn session_tx_fifo_dequeue_and_snd;
131 extern session_fifo_rx_fn session_tx_fifo_dequeue_internal;
133 u8 session_node_lookup_fifo_event (svm_fifo_t * f, session_event_t * e);
135 typedef struct session_main_
137 /** Worker contexts */
138 session_worker_t *wrk;
140 /** Event queues memfd segment initialized only if so configured */
141 ssvm_private_t evt_qs_segment;
143 /** Unique segment name counter */
144 u32 unique_segment_name_counter;
146 /** Per transport rx function that can either dequeue or peek */
147 session_fifo_rx_fn **session_tx_fns;
149 /** Per session type output nodes. Could optimize to group nodes by
150 * fib but lookup would then require session type parsing in session node.
151 * Trade memory for speed, for now */
152 u32 *session_type_to_next;
158 /** Session manager is enabled */
161 /** vpp fifo event queue configured length */
162 u32 configured_event_queue_length;
164 /** Session ssvm segment configs*/
165 uword session_baseva;
166 uword session_va_space_size;
167 uword evt_qs_segment_size;
168 u8 evt_qs_use_memfd_seg;
170 /** Session table size parameters */
171 u32 configured_v4_session_table_buckets;
172 u32 configured_v4_session_table_memory;
173 u32 configured_v4_halfopen_table_buckets;
174 u32 configured_v4_halfopen_table_memory;
175 u32 configured_v6_session_table_buckets;
176 u32 configured_v6_session_table_memory;
177 u32 configured_v6_halfopen_table_buckets;
178 u32 configured_v6_halfopen_table_memory;
180 /** Transport table (preallocation) size parameters */
181 u32 local_endpoints_table_memory;
182 u32 local_endpoints_table_buckets;
184 /** Preallocate session config parameter */
185 u32 preallocated_sessions;
189 extern session_main_t session_main;
190 extern vlib_node_registration_t session_queue_node;
191 extern vlib_node_registration_t session_queue_process_node;
192 extern vlib_node_registration_t session_queue_pre_input_node;
194 #define SESSION_Q_PROCESS_FLUSH_FRAMES 1
195 #define SESSION_Q_PROCESS_STOP 2
197 static inline session_evt_elt_t *
198 session_evt_elt_alloc (session_worker_t * wrk)
200 session_evt_elt_t *elt;
201 pool_get (wrk->event_elts, elt);
206 session_evt_elt_free (session_worker_t * wrk, session_evt_elt_t * elt)
208 pool_put (wrk->event_elts, elt);
212 session_evt_add_old (session_worker_t * wrk, session_evt_elt_t * elt)
214 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
215 pool_elt_at_index (wrk->event_elts, wrk->old_head));
219 session_evt_ctrl_data_alloc (session_worker_t * wrk)
221 session_evt_ctrl_data_t *data;
222 pool_get (wrk->ctrl_evts_data, data);
223 return (data - wrk->ctrl_evts_data);
226 static inline session_evt_elt_t *
227 session_evt_alloc_ctrl (session_worker_t * wrk)
229 session_evt_elt_t *elt;
230 elt = session_evt_elt_alloc (wrk);
231 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
232 pool_elt_at_index (wrk->event_elts, wrk->ctrl_head));
237 session_evt_ctrl_data (session_worker_t * wrk, session_evt_elt_t * elt)
239 return (void *) (pool_elt_at_index (wrk->ctrl_evts_data,
240 elt->evt.ctrl_data_index));
244 session_evt_ctrl_data_free (session_worker_t * wrk, session_evt_elt_t * elt)
246 ASSERT (elt->evt.event_type > SESSION_IO_EVT_BUILTIN_TX);
247 pool_put_index (wrk->ctrl_evts_data, elt->evt.ctrl_data_index);
250 static inline session_evt_elt_t *
251 session_evt_alloc_new (session_worker_t * wrk)
253 session_evt_elt_t *elt;
254 elt = session_evt_elt_alloc (wrk);
255 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
256 pool_elt_at_index (wrk->event_elts, wrk->new_head));
260 static inline session_evt_elt_t *
261 session_evt_alloc_old (session_worker_t * wrk)
263 session_evt_elt_t *elt;
264 elt = session_evt_elt_alloc (wrk);
265 clib_llist_add_tail (wrk->event_elts, evt_list, elt,
266 pool_elt_at_index (wrk->event_elts, wrk->old_head));
271 session_is_valid (u32 si, u8 thread_index)
274 s = pool_elt_at_index (session_main.wrk[thread_index].sessions, si);
275 if (s->session_state == SESSION_STATE_CLOSED)
278 if (s->thread_index != thread_index || s->session_index != si)
283 session_t *session_alloc (u32 thread_index);
284 void session_free (session_t * s);
285 void session_free_w_fifos (session_t * s);
287 always_inline session_t *
288 session_get (u32 si, u32 thread_index)
290 ASSERT (session_is_valid (si, thread_index));
291 return pool_elt_at_index (session_main.wrk[thread_index].sessions, si);
294 always_inline session_t *
295 session_get_if_valid (u64 si, u32 thread_index)
297 if (thread_index >= vec_len (session_main.wrk))
300 if (pool_is_free_index (session_main.wrk[thread_index].sessions, si))
303 ASSERT (session_is_valid (si, thread_index));
304 return pool_elt_at_index (session_main.wrk[thread_index].sessions, si);
307 always_inline session_t *
308 session_get_from_handle (session_handle_t handle)
310 session_main_t *smm = &session_main;
311 u32 session_index, thread_index;
312 session_parse_handle (handle, &session_index, &thread_index);
313 return pool_elt_at_index (smm->wrk[thread_index].sessions, session_index);
316 always_inline session_t *
317 session_get_from_handle_if_valid (session_handle_t handle)
319 u32 session_index, thread_index;
320 session_parse_handle (handle, &session_index, &thread_index);
321 return session_get_if_valid (session_index, thread_index);
324 u64 session_segment_handle (session_t * s);
327 * Acquires a lock that blocks a session pool from expanding.
329 * This is typically used for safely peeking into other threads'
330 * pools in order to clone elements. Lock should be dropped as soon
331 * as possible by calling @ref session_pool_remove_peeker.
333 * NOTE: Avoid using pool_elt_at_index while the lock is held because
334 * it may lead to free elt bitmap expansion/contraction!
337 session_pool_add_peeker (u32 thread_index)
339 session_worker_t *wrk = &session_main.wrk[thread_index];
340 if (thread_index == vlib_get_thread_index ())
342 clib_rwlock_reader_lock (&wrk->peekers_rw_locks);
346 session_pool_remove_peeker (u32 thread_index)
348 session_worker_t *wrk = &session_main.wrk[thread_index];
349 if (thread_index == vlib_get_thread_index ())
351 clib_rwlock_reader_unlock (&wrk->peekers_rw_locks);
355 * Get session from handle and 'lock' pool resize if not in same thread
357 * Caller should drop the peek 'lock' as soon as possible.
359 always_inline session_t *
360 session_get_from_handle_safe (u64 handle)
362 u32 thread_index = session_thread_from_handle (handle);
363 session_worker_t *wrk = &session_main.wrk[thread_index];
365 if (thread_index == vlib_get_thread_index ())
367 return pool_elt_at_index (wrk->sessions,
368 session_index_from_handle (handle));
372 session_pool_add_peeker (thread_index);
373 /* Don't use pool_elt_at index. See @ref session_pool_add_peeker */
374 return wrk->sessions + session_index_from_handle (handle);
379 session_get_index (session_t * s)
381 return (s - session_main.wrk[s->thread_index].sessions);
384 always_inline session_t *
385 session_clone_safe (u32 session_index, u32 thread_index)
387 session_t *old_s, *new_s;
388 u32 current_thread_index = vlib_get_thread_index ();
390 /* If during the memcpy pool is reallocated AND the memory allocator
391 * decides to give the old chunk of memory to somebody in a hurry to
392 * scribble something on it, we have a problem. So add this thread as
393 * a session pool peeker.
395 session_pool_add_peeker (thread_index);
396 new_s = session_alloc (current_thread_index);
397 old_s = session_main.wrk[thread_index].sessions + session_index;
398 clib_memcpy_fast (new_s, old_s, sizeof (*new_s));
399 session_pool_remove_peeker (thread_index);
400 new_s->thread_index = current_thread_index;
401 new_s->session_index = session_get_index (new_s);
405 int session_open (u32 app_index, session_endpoint_t * tep, u32 opaque);
406 int session_listen (session_t * s, session_endpoint_cfg_t * sep);
407 int session_stop_listen (session_t * s);
408 void session_close (session_t * s);
409 void session_reset (session_t * s);
410 void session_transport_close (session_t * s);
411 void session_transport_reset (session_t * s);
412 void session_transport_cleanup (session_t * s);
413 int session_send_io_evt_to_thread (svm_fifo_t * f,
414 session_evt_type_t evt_type);
415 int session_enqueue_notify (session_t * s);
416 int session_dequeue_notify (session_t * s);
417 int session_send_io_evt_to_thread_custom (void *data, u32 thread_index,
418 session_evt_type_t evt_type);
419 void session_send_rpc_evt_to_thread (u32 thread_index, void *fp,
421 void session_send_rpc_evt_to_thread_force (u32 thread_index, void *fp,
423 void session_add_self_custom_tx_evt (transport_connection_t * tc,
425 transport_connection_t *session_get_transport (session_t * s);
426 void session_get_endpoint (session_t * s, transport_endpoint_t * tep,
429 u8 *format_session (u8 * s, va_list * args);
430 uword unformat_session (unformat_input_t * input, va_list * args);
431 uword unformat_transport_connection (unformat_input_t * input,
435 * Interface to transport protos
438 int session_enqueue_stream_connection (transport_connection_t * tc,
439 vlib_buffer_t * b, u32 offset,
440 u8 queue_event, u8 is_in_order);
441 int session_enqueue_dgram_connection (session_t * s,
442 session_dgram_hdr_t * hdr,
443 vlib_buffer_t * b, u8 proto,
445 int session_stream_connect_notify (transport_connection_t * tc, u8 is_fail);
446 int session_dgram_connect_notify (transport_connection_t * tc,
447 u32 old_thread_index,
448 session_t ** new_session);
449 int session_stream_accept_notify (transport_connection_t * tc);
450 void session_transport_closing_notify (transport_connection_t * tc);
451 void session_transport_delete_notify (transport_connection_t * tc);
452 void session_transport_closed_notify (transport_connection_t * tc);
453 void session_transport_reset_notify (transport_connection_t * tc);
454 int session_stream_accept (transport_connection_t * tc, u32 listener_index,
455 u32 thread_index, u8 notify);
456 void session_register_transport (transport_proto_t transport_proto,
457 const transport_proto_vft_t * vft, u8 is_ip4,
459 int session_tx_fifo_peek_bytes (transport_connection_t * tc, u8 * buffer,
460 u32 offset, u32 max_bytes);
461 u32 session_tx_fifo_dequeue_drop (transport_connection_t * tc, u32 max_bytes);
464 transport_max_rx_enqueue (transport_connection_t * tc)
466 session_t *s = session_get (tc->s_index, tc->thread_index);
467 return svm_fifo_max_enqueue_prod (s->rx_fifo);
471 transport_max_tx_dequeue (transport_connection_t * tc)
473 session_t *s = session_get (tc->s_index, tc->thread_index);
474 return svm_fifo_max_dequeue_cons (s->tx_fifo);
478 transport_max_rx_dequeue (transport_connection_t * tc)
480 session_t *s = session_get (tc->s_index, tc->thread_index);
481 return svm_fifo_max_dequeue (s->rx_fifo);
485 transport_rx_fifo_size (transport_connection_t * tc)
487 session_t *s = session_get (tc->s_index, tc->thread_index);
488 return s->rx_fifo->nitems;
492 transport_tx_fifo_size (transport_connection_t * tc)
494 session_t *s = session_get (tc->s_index, tc->thread_index);
495 return s->tx_fifo->nitems;
499 transport_rx_fifo_has_ooo_data (transport_connection_t * tc)
501 session_t *s = session_get (tc->c_index, tc->thread_index);
502 return svm_fifo_has_ooo_data (s->rx_fifo);
506 transport_time_now (u32 thread_index)
508 return session_main.wrk[thread_index].last_vlib_time;
512 transport_add_tx_event (transport_connection_t * tc)
514 session_t *s = session_get (tc->s_index, tc->thread_index);
515 if (svm_fifo_has_event (s->tx_fifo))
517 session_send_io_evt_to_thread (s->tx_fifo, SESSION_IO_EVT_TX);
525 listen_session_get_handle (session_t * s)
527 ASSERT (s->session_state == SESSION_STATE_LISTENING ||
528 session_get_transport_proto (s) == TRANSPORT_PROTO_QUIC);
529 return session_handle (s);
532 always_inline session_t *
533 listen_session_get_from_handle (session_handle_t handle)
535 return session_get_from_handle (handle);
539 listen_session_parse_handle (session_handle_t handle, u32 * index,
542 session_parse_handle (handle, index, thread_index);
545 always_inline session_t *
546 listen_session_alloc (u8 thread_index, session_type_t type)
549 s = session_alloc (thread_index);
550 s->session_type = type;
551 s->session_state = SESSION_STATE_LISTENING;
555 always_inline session_t *
556 listen_session_get (u32 ls_index)
558 return session_get (ls_index, 0);
562 listen_session_free (session_t * s)
567 transport_connection_t *listen_session_get_transport (session_t * s);
570 * Session layer functions
573 always_inline session_main_t *
574 vnet_get_session_main ()
576 return &session_main;
579 always_inline session_worker_t *
580 session_main_get_worker (u32 thread_index)
582 return &session_main.wrk[thread_index];
585 static inline session_worker_t *
586 session_main_get_worker_if_valid (u32 thread_index)
588 if (pool_is_free_index (session_main.wrk, thread_index))
590 return &session_main.wrk[thread_index];
593 always_inline svm_msg_q_t *
594 session_main_get_vpp_event_queue (u32 thread_index)
596 return session_main.wrk[thread_index].vpp_event_queue;
600 session_main_is_enabled ()
602 return session_main.is_enabled == 1;
605 #define session_cli_return_if_not_enabled() \
607 if (!session_main.is_enabled) \
608 return clib_error_return (0, "session layer is not enabled"); \
611 int session_main_flush_enqueue_events (u8 proto, u32 thread_index);
612 int session_main_flush_all_enqueue_events (u8 transport_proto);
613 void session_flush_frames_main_thread (vlib_main_t * vm);
614 ssvm_private_t *session_main_get_evt_q_segment (void);
615 void session_node_enable_disable (u8 is_en);
616 clib_error_t *vnet_session_enable_disable (vlib_main_t * vm, u8 is_en);
618 #endif /* __included_session_h__ */
621 * fd.io coding-style-patch-verification: ON
624 * eval: (c-set-style "gnu")