src/vnet/session/session.h

   1 /*
   2  * Copyright (c) 2017 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:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   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.
  14  */
  15 #ifndef __included_session_h__
  16 #define __included_session_h__
  17
  18 #include <vnet/session/transport.h>
  19 #include <vlibmemory/unix_shared_memory_queue.h>
  20 #include <vnet/session/session_debug.h>
  21 #include <vnet/session/segment_manager.h>
  22
  23 #define HALF_OPEN_LOOKUP_INVALID_VALUE ((u64)~0)
  24 #define INVALID_INDEX ((u32)~0)
  25
  26 /* TODO decide how much since we have pre-data as well */
  27 #define MAX_HDRS_LEN    100     /* Max number of bytes for headers */
  28
  29 typedef enum
  30 {
  31   FIFO_EVENT_APP_RX,
  32   FIFO_EVENT_APP_TX,
  33   FIFO_EVENT_TIMEOUT,
  34   FIFO_EVENT_DISCONNECT,
  35   FIFO_EVENT_BUILTIN_RX,
  36   FIFO_EVENT_RPC,
  37 } fifo_event_type_t;
  38
  39 #define foreach_session_input_error                                     \
  40 _(NO_SESSION, "No session drops")                                       \
  41 _(NO_LISTENER, "No listener for dst port drops")                        \
  42 _(ENQUEUED, "Packets pushed into rx fifo")                              \
  43 _(NOT_READY, "Session not ready packets")                               \
  44 _(FIFO_FULL, "Packets dropped for lack of rx fifo space")               \
  45 _(EVENT_FIFO_FULL, "Events not sent for lack of event fifo space")      \
  46 _(API_QUEUE_FULL, "Sessions not created for lack of API queue space")   \
  47 _(NEW_SEG_NO_SPACE, "Created segment, couldn't allocate a fifo pair")   \
  48 _(NO_SPACE, "Couldn't allocate a fifo pair")
  49
  50 typedef enum
  51 {
  52 #define _(sym,str) SESSION_ERROR_##sym,
  53   foreach_session_input_error
  54 #undef _
  55     SESSION_N_ERROR,
  56 } session_error_t;
  57
  58 /* Event queue input node static next indices */
  59 typedef enum
  60 {
  61   SESSION_QUEUE_NEXT_DROP,
  62   SESSION_QUEUE_NEXT_TCP_IP4_OUTPUT,
  63   SESSION_QUEUE_NEXT_IP4_LOOKUP,
  64   SESSION_QUEUE_NEXT_TCP_IP6_OUTPUT,
  65   SESSION_QUEUE_NEXT_IP6_LOOKUP,
  66   SESSION_QUEUE_N_NEXT,
  67 } session_queue_next_t;
  68
  69 #define foreach_session_type                    \
  70   _(IP4_TCP, ip4_tcp)                           \
  71   _(IP4_UDP, ip4_udp)                           \
  72   _(IP6_TCP, ip6_tcp)                           \
  73   _(IP6_UDP, ip6_udp)
  74
  75 typedef enum
  76 {
  77 #define _(A, a) SESSION_TYPE_##A,
  78   foreach_session_type
  79 #undef _
  80     SESSION_N_TYPES,
  81 } session_type_t;
  82
  83
  84 session_type_t
  85 session_type_from_proto_and_ip (transport_proto_t proto, u8 is_ip4);
  86
  87 /*
  88  * Application session state
  89  */
  90 typedef enum
  91 {
  92   SESSION_STATE_LISTENING,
  93   SESSION_STATE_CONNECTING,
  94   SESSION_STATE_ACCEPTING,
  95   SESSION_STATE_READY,
  96   SESSION_STATE_CLOSED,
  97   SESSION_STATE_N_STATES,
  98 } stream_session_state_t;
  99
 100 typedef struct
 101 {
 102   void *fp;
 103   void *arg;
 104 } rpc_args_t;
 105
 106 /* *INDENT-OFF* */
 107 typedef CLIB_PACKED (struct {
 108   union
 109     {
 110       svm_fifo_t * fifo;
 111       u64 session_handle;
 112       rpc_args_t rpc_args;
 113     };
 114   u8 event_type;
 115   u16 event_id;
 116 }) session_fifo_event_t;
 117 /* *INDENT-ON* */
 118
 119 typedef struct _stream_session_t
 120 {
 121   /** fifo pointers. Once allocated, these do not move */
 122   svm_fifo_t *server_rx_fifo;
 123   svm_fifo_t *server_tx_fifo;
 124
 125   /** Type */
 126   u8 session_type;
 127
 128   /** State */
 129   u8 session_state;
 130
 131   u8 thread_index;
 132
 133   /** To avoid n**2 "one event per frame" check */
 134   u8 enqueue_epoch;
 135
 136   /** Pad to a multiple of 8 octets */
 137   u8 align_pad[4];
 138
 139   /** svm segment index where fifos were allocated */
 140   u32 svm_segment_index;
 141
 142   /** Session index in per_thread pool */
 143   u32 session_index;
 144
 145   /** Transport specific */
 146   u32 connection_index;
 147
 148   /** Application specific */
 149   u32 pid;
 150
 151   /** stream server pool index */
 152   u32 app_index;
 153
 154   /** Parent listener session if the result of an accept */
 155   u32 listener_index;
 156
 157   /** Opaque, pad to a 64-octet boundary */
 158   u64 opaque[2];
 159 } stream_session_t;
 160
 161 /* Forward definition */
 162 typedef struct _session_manager_main session_manager_main_t;
 163
 164 typedef int
 165   (session_fifo_rx_fn) (vlib_main_t * vm, vlib_node_runtime_t * node,
 166                         session_manager_main_t * smm,
 167                         session_fifo_event_t * e0, stream_session_t * s0,
 168                         u32 thread_index, int *n_tx_pkts);
 169
 170 extern session_fifo_rx_fn session_tx_fifo_peek_and_snd;
 171 extern session_fifo_rx_fn session_tx_fifo_dequeue_and_snd;
 172
 173 struct _session_manager_main
 174 {
 175   /** Lookup tables for established sessions and listeners */
 176   clib_bihash_16_8_t v4_session_hash;
 177   clib_bihash_48_8_t v6_session_hash;
 178
 179   /** Lookup tables for half-open sessions */
 180   clib_bihash_16_8_t v4_half_open_hash;
 181   clib_bihash_48_8_t v6_half_open_hash;
 182
 183   /** Per worker thread session pools */
 184   stream_session_t **sessions;
 185
 186   /** Pool of listen sessions. Same type as stream sessions to ease lookups */
 187   stream_session_t *listen_sessions[SESSION_N_TYPES];
 188
 189   /** Sparse vector to map dst port to stream server  */
 190   u16 *stream_server_by_dst_port[SESSION_N_TYPES];
 191
 192   /** per-worker enqueue epoch counters */
 193   u8 *current_enqueue_epoch;
 194
 195   /** Per-worker thread vector of sessions to enqueue */
 196   u32 **session_indices_to_enqueue_by_thread;
 197
 198   /** per-worker tx buffer free lists */
 199   u32 **tx_buffers;
 200
 201   /** Per worker-thread vector of partially read events */
 202   session_fifo_event_t **free_event_vector;
 203
 204   /** per-worker active event vectors */
 205   session_fifo_event_t **pending_event_vector;
 206
 207   /** vpp fifo event queue */
 208   unix_shared_memory_queue_t **vpp_event_queues;
 209
 210   /** vpp fifo event queue configured length */
 211   u32 configured_event_queue_length;
 212
 213   /** Unique segment name counter */
 214   u32 unique_segment_name_counter;
 215
 216   /** Per transport rx function that can either dequeue or peek */
 217   session_fifo_rx_fn *session_tx_fns[SESSION_N_TYPES];
 218
 219   /** Session manager is enabled */
 220   u8 is_enabled;
 221
 222   /** Preallocate session config parameter */
 223   u32 preallocated_sessions;
 224
 225   /* Convenience */
 226   vlib_main_t *vlib_main;
 227   vnet_main_t *vnet_main;
 228
 229 #if SESSION_DBG
 230   /**
 231    * last event poll time by thread
 232    * Debug only. Will cause false cache-line sharing as-is
 233    */
 234   f64 *last_event_poll_by_thread;
 235 #endif
 236
 237 };
 238
 239 extern session_manager_main_t session_manager_main;
 240 extern vlib_node_registration_t session_queue_node;
 241
 242 /*
 243  * Session manager function
 244  */
 245 always_inline session_manager_main_t *
 246 vnet_get_session_manager_main ()
 247 {
 248   return &session_manager_main;
 249 }
 250
 251 /*
 252  * Stream session functions
 253  */
 254
 255 stream_session_t *stream_session_lookup_listener4 (ip4_address_t * lcl,
 256                                                    u16 lcl_port, u8 proto);
 257 stream_session_t *stream_session_lookup4 (ip4_address_t * lcl,
 258                                           ip4_address_t * rmt, u16 lcl_port,
 259                                           u16 rmt_port, u8 proto);
 260 stream_session_t *stream_session_lookup_listener6 (ip6_address_t * lcl,
 261                                                    u16 lcl_port, u8 proto);
 262 stream_session_t *stream_session_lookup6 (ip6_address_t * lcl,
 263                                           ip6_address_t * rmt, u16 lcl_port,
 264                                           u16 rmt_port, u8 proto);
 265 transport_connection_t
 266   * stream_session_lookup_transport4 (ip4_address_t * lcl,
 267                                       ip4_address_t * rmt, u16 lcl_port,
 268                                       u16 rmt_port, u8 proto,
 269                                       u32 thread_index);
 270 transport_connection_t
 271   * stream_session_lookup_transport6 (ip6_address_t * lcl,
 272                                       ip6_address_t * rmt, u16 lcl_port,
 273                                       u16 rmt_port, u8 proto,
 274                                       u32 thread_index);
 275 stream_session_t *stream_session_lookup_listener (ip46_address_t * lcl,
 276                                                   u16 lcl_port, u8 proto);
 277 void stream_session_table_add_for_tc (transport_connection_t * tc, u64 value);
 278 int stream_session_table_del_for_tc (transport_connection_t * tc);
 279
 280 always_inline stream_session_t *
 281 stream_session_get_tsi (u64 ti_and_si, u32 thread_index)
 282 {
 283   ASSERT ((u32) (ti_and_si >> 32) == thread_index);
 284   return pool_elt_at_index (session_manager_main.sessions[thread_index],
 285                             ti_and_si & 0xFFFFFFFFULL);
 286 }
 287
 288 always_inline u8
 289 stream_session_is_valid (u32 si, u8 thread_index)
 290 {
 291   stream_session_t *s;
 292   s = pool_elt_at_index (session_manager_main.sessions[thread_index], si);
 293   if (s->thread_index != thread_index || s->session_index != si
 294       || s->server_rx_fifo->master_session_index != si
 295       || s->server_tx_fifo->master_session_index != si
 296       || s->server_rx_fifo->master_thread_index != thread_index
 297       || s->server_tx_fifo->master_thread_index != thread_index)
 298     return 0;
 299   return 1;
 300 }
 301
 302 always_inline stream_session_t *
 303 stream_session_get (u32 si, u32 thread_index)
 304 {
 305   ASSERT (stream_session_is_valid (si, thread_index));
 306   return pool_elt_at_index (session_manager_main.sessions[thread_index], si);
 307 }
 308
 309 always_inline stream_session_t *
 310 stream_session_get_if_valid (u64 si, u32 thread_index)
 311 {
 312   if (thread_index >= vec_len (session_manager_main.sessions))
 313     return 0;
 314
 315   if (pool_is_free_index (session_manager_main.sessions[thread_index], si))
 316     return 0;
 317
 318   ASSERT (stream_session_is_valid (si, thread_index));
 319   return pool_elt_at_index (session_manager_main.sessions[thread_index], si);
 320 }
 321
 322 always_inline u64
 323 stream_session_handle (stream_session_t * s)
 324 {
 325   return ((u64) s->thread_index << 32) | (u64) s->session_index;
 326 }
 327
 328 always_inline u32
 329 stream_session_index_from_handle (u64 handle)
 330 {
 331   return handle & 0xFFFFFFFF;
 332 }
 333
 334 always_inline u32
 335 stream_session_thread_from_handle (u64 handle)
 336 {
 337   return handle >> 32;
 338 }
 339
 340 always_inline void
 341 stream_session_parse_handle (u64 handle, u32 * index, u32 * thread_index)
 342 {
 343   *index = stream_session_index_from_handle (handle);
 344   *thread_index = stream_session_thread_from_handle (handle);
 345 }
 346
 347 always_inline stream_session_t *
 348 stream_session_get_from_handle (u64 handle)
 349 {
 350   session_manager_main_t *smm = &session_manager_main;
 351   return pool_elt_at_index (smm->sessions[stream_session_thread_from_handle
 352                                           (handle)],
 353                             stream_session_index_from_handle (handle));
 354 }
 355
 356 always_inline stream_session_t *
 357 stream_session_listener_get (u8 sst, u64 si)
 358 {
 359   return pool_elt_at_index (session_manager_main.listen_sessions[sst], si);
 360 }
 361
 362 always_inline u32
 363 stream_session_get_index (stream_session_t * s)
 364 {
 365   if (s->session_state == SESSION_STATE_LISTENING)
 366     return s - session_manager_main.listen_sessions[s->session_type];
 367
 368   return s - session_manager_main.sessions[s->thread_index];
 369 }
 370
 371 always_inline u32
 372 stream_session_max_rx_enqueue (transport_connection_t * tc)
 373 {
 374   stream_session_t *s = stream_session_get (tc->s_index, tc->thread_index);
 375   return svm_fifo_max_enqueue (s->server_rx_fifo);
 376 }
 377
 378 always_inline u32
 379 stream_session_rx_fifo_size (transport_connection_t * tc)
 380 {
 381   stream_session_t *s = stream_session_get (tc->s_index, tc->thread_index);
 382   return s->server_rx_fifo->nitems;
 383 }
 384
 385 u32 stream_session_tx_fifo_max_dequeue (transport_connection_t * tc);
 386
 387 int
 388 stream_session_enqueue_data (transport_connection_t * tc, vlib_buffer_t * b,
 389                              u32 offset, u8 queue_event, u8 is_in_order);
 390 int
 391 stream_session_peek_bytes (transport_connection_t * tc, u8 * buffer,
 392                            u32 offset, u32 max_bytes);
 393 u32 stream_session_dequeue_drop (transport_connection_t * tc, u32 max_bytes);
 394
 395 int stream_session_connect_notify (transport_connection_t * tc, u8 sst,
 396                                    u8 is_fail);
 397 void stream_session_init_fifos_pointers (transport_connection_t * tc,
 398                                          u32 rx_pointer, u32 tx_pointer);
 399
 400 void stream_session_accept_notify (transport_connection_t * tc);
 401 void stream_session_disconnect_notify (transport_connection_t * tc);
 402 void stream_session_delete_notify (transport_connection_t * tc);
 403 void stream_session_reset_notify (transport_connection_t * tc);
 404 int
 405 stream_session_accept (transport_connection_t * tc, u32 listener_index,
 406                        u8 sst, u8 notify);
 407 int
 408 stream_session_open (u32 app_index, session_type_t st,
 409                      transport_endpoint_t * tep,
 410                      transport_connection_t ** tc);
 411 int stream_session_listen (stream_session_t * s, transport_endpoint_t * tep);
 412 int stream_session_stop_listen (stream_session_t * s);
 413 void stream_session_disconnect (stream_session_t * s);
 414 void stream_session_cleanup (stream_session_t * s);
 415 void session_send_session_evt_to_thread (u64 session_handle,
 416                                          fifo_event_type_t evt_type,
 417                                          u32 thread_index);
 418 u8 *format_stream_session (u8 * s, va_list * args);
 419 int
 420 send_session_connected_callback (u32 app_index, u32 api_context,
 421                                  stream_session_t * s, u8 is_fail);
 422
 423
 424 void session_register_transport (u8 type, const transport_proto_vft_t * vft);
 425 transport_proto_vft_t *session_get_transport_vft (u8 type);
 426
 427 clib_error_t *vnet_session_enable_disable (vlib_main_t * vm, u8 is_en);
 428
 429 always_inline unix_shared_memory_queue_t *
 430 session_manager_get_vpp_event_queue (u32 thread_index)
 431 {
 432   return session_manager_main.vpp_event_queues[thread_index];
 433 }
 434
 435 int session_manager_flush_enqueue_events (u32 thread_index);
 436
 437 always_inline u64
 438 listen_session_get_handle (stream_session_t * s)
 439 {
 440   ASSERT (s->session_state == SESSION_STATE_LISTENING);
 441   return ((u64) s->session_type << 32) | s->session_index;
 442 }
 443
 444 always_inline stream_session_t *
 445 listen_session_get_from_handle (u64 handle)
 446 {
 447   session_manager_main_t *smm = &session_manager_main;
 448   stream_session_t *s;
 449   u32 type, index;
 450   type = handle >> 32;
 451   index = handle & 0xFFFFFFFF;
 452
 453   if (pool_is_free_index (smm->listen_sessions[type], index))
 454     return 0;
 455
 456   s = pool_elt_at_index (smm->listen_sessions[type], index);
 457   ASSERT (s->session_state == SESSION_STATE_LISTENING);
 458   return s;
 459 }
 460
 461 always_inline stream_session_t *
 462 listen_session_new (session_type_t type)
 463 {
 464   stream_session_t *s;
 465   pool_get_aligned (session_manager_main.listen_sessions[type], s,
 466                     CLIB_CACHE_LINE_BYTES);
 467   memset (s, 0, sizeof (*s));
 468
 469   s->session_type = type;
 470   s->session_state = SESSION_STATE_LISTENING;
 471   s->session_index = s - session_manager_main.listen_sessions[type];
 472
 473   return s;
 474 }
 475
 476 always_inline stream_session_t *
 477 listen_session_get (session_type_t type, u32 index)
 478 {
 479   return pool_elt_at_index (session_manager_main.listen_sessions[type],
 480                             index);
 481 }
 482
 483 always_inline void
 484 listen_session_del (stream_session_t * s)
 485 {
 486   pool_put (session_manager_main.listen_sessions[s->session_type], s);
 487 }
 488
 489 always_inline u8
 490 session_manager_is_enabled ()
 491 {
 492   return session_manager_main.is_enabled == 1;
 493 }
 494
 495 #endif /* __included_session_h__ */
 496
 497 /*
 498  * fd.io coding-style-patch-verification: ON
 499  *
 500  * Local Variables:
 501  * eval: (c-set-style "gnu")
 502  * End:
 503  */