src/vnet/session/session_input.c

   1 /* SPDX-License-Identifier: Apache-2.0
   2  * Copyright(c) 2023 Cisco Systems, Inc.
   3  */
   4
   5 #include <vnet/session/session.h>
   6 #include <vnet/session/application.h>
   7
   8 static inline int
   9 mq_try_lock (svm_msg_q_t *mq)
  10 {
  11   int rv, n_try = 0;
  12
  13   while (n_try < 100)
  14     {
  15       rv = svm_msg_q_try_lock (mq);
  16       if (!rv)
  17         return 0;
  18       n_try += 1;
  19       usleep (1);
  20     }
  21
  22   return -1;
  23 }
  24
  25 always_inline u8
  26 mq_event_ring_index (session_evt_type_t et)
  27 {
  28   return (et >= SESSION_CTRL_EVT_RPC ? SESSION_MQ_CTRL_EVT_RING :
  29                                              SESSION_MQ_IO_EVT_RING);
  30 }
  31
  32 void
  33 app_worker_del_all_events (app_worker_t *app_wrk)
  34 {
  35   session_worker_t *wrk;
  36   session_event_t *evt;
  37   u32 thread_index;
  38   session_t *s;
  39
  40   for (thread_index = 0; thread_index < vec_len (app_wrk->wrk_evts);
  41        thread_index++)
  42     {
  43       while (clib_fifo_elts (app_wrk->wrk_evts[thread_index]))
  44         {
  45           clib_fifo_sub2 (app_wrk->wrk_evts[thread_index], evt);
  46           switch (evt->event_type)
  47             {
  48             case SESSION_CTRL_EVT_MIGRATED:
  49               s = session_get (evt->session_index, thread_index);
  50               transport_cleanup (session_get_transport_proto (s),
  51                                  s->connection_index, s->thread_index);
  52               session_free (s);
  53               break;
  54             case SESSION_CTRL_EVT_CLEANUP:
  55               s = session_get (evt->as_u64[0] & 0xffffffff, thread_index);
  56               if (evt->as_u64[0] >> 32 != SESSION_CLEANUP_SESSION)
  57                 break;
  58               uword_to_pointer (evt->as_u64[1], void (*) (session_t * s)) (s);
  59               break;
  60             case SESSION_CTRL_EVT_HALF_CLEANUP:
  61               s = ho_session_get (evt->session_index);
  62               pool_put_index (app_wrk->half_open_table, s->ho_index);
  63               session_free (s);
  64               break;
  65             default:
  66               break;
  67             }
  68         }
  69       wrk = session_main_get_worker (thread_index);
  70       clib_bitmap_set (wrk->app_wrks_pending_ntf, app_wrk->wrk_index, 0);
  71     }
  72 }
  73
  74 always_inline int
  75 app_worker_flush_events_inline (app_worker_t *app_wrk, u32 thread_index,
  76                                 u8 is_builtin)
  77 {
  78   application_t *app = application_get (app_wrk->app_index);
  79   svm_msg_q_t *mq = app_wrk->event_queue;
  80   u8 ring_index, mq_is_cong;
  81   session_state_t old_state;
  82   session_event_t *evt;
  83   u32 n_evts = 128, i;
  84   session_t *s;
  85   int rv;
  86
  87   n_evts = clib_min (n_evts, clib_fifo_elts (app_wrk->wrk_evts[thread_index]));
  88
  89   if (!is_builtin)
  90     {
  91       mq_is_cong = app_worker_mq_is_congested (app_wrk);
  92       if (mq_try_lock (mq))
  93         {
  94           app_worker_set_mq_wrk_congested (app_wrk, thread_index);
  95           return 0;
  96         }
  97     }
  98
  99   for (i = 0; i < n_evts; i++)
 100     {
 101       evt = clib_fifo_head (app_wrk->wrk_evts[thread_index]);
 102       if (!is_builtin)
 103         {
 104           ring_index = mq_event_ring_index (evt->event_type);
 105           if (svm_msg_q_or_ring_is_full (mq, ring_index))
 106             {
 107               app_worker_set_mq_wrk_congested (app_wrk, thread_index);
 108               break;
 109             }
 110         }
 111
 112       switch (evt->event_type)
 113         {
 114         case SESSION_IO_EVT_RX:
 115           s = session_get (evt->session_index, thread_index);
 116           /* Application didn't confirm accept yet */
 117           if (PREDICT_FALSE (s->session_state == SESSION_STATE_ACCEPTING ||
 118                              s->session_state == SESSION_STATE_CONNECTING))
 119             break;
 120           s->flags &= ~SESSION_F_RX_EVT;
 121           app->cb_fns.builtin_app_rx_callback (s);
 122           break;
 123         /* Handle sessions that might not be on current thread */
 124         case SESSION_IO_EVT_BUILTIN_RX:
 125           s = session_get_from_handle_if_valid (evt->session_handle);
 126           if (!s || s->session_state == SESSION_STATE_ACCEPTING ||
 127               s->session_state == SESSION_STATE_CONNECTING)
 128             break;
 129           s->flags &= ~SESSION_F_RX_EVT;
 130           app->cb_fns.builtin_app_rx_callback (s);
 131           break;
 132         case SESSION_IO_EVT_TX:
 133           s = session_get (evt->session_index, thread_index);
 134           app->cb_fns.builtin_app_tx_callback (s);
 135           break;
 136         case SESSION_IO_EVT_TX_MAIN:
 137           s = session_get_from_handle_if_valid (evt->session_handle);
 138           if (!s)
 139             break;
 140           app->cb_fns.builtin_app_tx_callback (s);
 141           break;
 142         case SESSION_CTRL_EVT_BOUND:
 143           /* No app cb function currently */
 144           if (is_builtin)
 145             break;
 146           mq_send_session_bound_cb (app_wrk->wrk_index, evt->as_u64[1] >> 32,
 147                                     evt->session_handle,
 148                                     evt->as_u64[1] & 0xffffffff);
 149           break;
 150         case SESSION_CTRL_EVT_ACCEPTED:
 151           s = session_get (evt->session_index, thread_index);
 152           old_state = s->session_state;
 153           if (app->cb_fns.session_accept_callback (s))
 154             {
 155               session_close (s);
 156               s->app_wrk_index = SESSION_INVALID_INDEX;
 157               break;
 158             }
 159           if (is_builtin)
 160             {
 161               if (s->flags & SESSION_F_RX_EVT)
 162                 {
 163                   s->flags &= ~SESSION_F_RX_EVT;
 164                   app->cb_fns.builtin_app_rx_callback (s);
 165                 }
 166               if (old_state >= SESSION_STATE_TRANSPORT_CLOSING)
 167                 {
 168                   session_set_state (s, old_state);
 169                   app_worker_close_notify (app_wrk, s);
 170                 }
 171             }
 172           break;
 173         case SESSION_CTRL_EVT_CONNECTED:
 174           if (!(evt->as_u64[1] & 0xffffffff))
 175             {
 176               s = session_get (evt->session_index, thread_index);
 177               old_state = s->session_state;
 178             }
 179           else
 180             s = 0;
 181           rv = app->cb_fns.session_connected_callback (
 182             app_wrk->wrk_index, evt->as_u64[1] >> 32, s,
 183             evt->as_u64[1] & 0xffffffff);
 184           if (!s)
 185             break;
 186           if (rv)
 187             {
 188               session_close (s);
 189               s->app_wrk_index = SESSION_INVALID_INDEX;
 190               break;
 191             }
 192           if (s->flags & SESSION_F_RX_EVT)
 193             {
 194               s->flags &= ~SESSION_F_RX_EVT;
 195               app->cb_fns.builtin_app_rx_callback (s);
 196             }
 197           if (old_state >= SESSION_STATE_TRANSPORT_CLOSING)
 198             {
 199               session_set_state (s, old_state);
 200               app_worker_close_notify (app_wrk, s);
 201             }
 202           break;
 203         case SESSION_CTRL_EVT_DISCONNECTED:
 204           s = session_get (evt->session_index, thread_index);
 205           app->cb_fns.session_disconnect_callback (s);
 206           break;
 207         case SESSION_CTRL_EVT_RESET:
 208           s = session_get (evt->session_index, thread_index);
 209           app->cb_fns.session_reset_callback (s);
 210           break;
 211         case SESSION_CTRL_EVT_UNLISTEN_REPLY:
 212           if (is_builtin)
 213             break;
 214           mq_send_unlisten_reply (app_wrk, evt->session_handle,
 215                                   evt->as_u64[1] >> 32,
 216                                   evt->as_u64[1] & 0xffffffff);
 217           break;
 218         case SESSION_CTRL_EVT_MIGRATED:
 219           s = session_get (evt->session_index, thread_index);
 220           app->cb_fns.session_migrate_callback (s, evt->as_u64[1]);
 221           transport_cleanup (session_get_transport_proto (s),
 222                              s->connection_index, s->thread_index);
 223           session_free (s);
 224           /* Notify app that it has data on the new session */
 225           s = session_get_from_handle (evt->as_u64[1]);
 226           session_send_io_evt_to_thread (s->rx_fifo,
 227                                          SESSION_IO_EVT_BUILTIN_RX);
 228           break;
 229         case SESSION_CTRL_EVT_TRANSPORT_CLOSED:
 230           s = session_get (evt->session_index, thread_index);
 231           if (app->cb_fns.session_transport_closed_callback)
 232             app->cb_fns.session_transport_closed_callback (s);
 233           break;
 234         case SESSION_CTRL_EVT_CLEANUP:
 235           s = session_get (evt->as_u64[0] & 0xffffffff, thread_index);
 236           if (app->cb_fns.session_cleanup_callback)
 237             app->cb_fns.session_cleanup_callback (s, evt->as_u64[0] >> 32);
 238           if (evt->as_u64[0] >> 32 != SESSION_CLEANUP_SESSION)
 239             break;
 240           uword_to_pointer (evt->as_u64[1], void (*) (session_t * s)) (s);
 241           break;
 242         case SESSION_CTRL_EVT_HALF_CLEANUP:
 243           s = ho_session_get (evt->session_index);
 244           ASSERT (session_vlib_thread_is_cl_thread ());
 245           if (app->cb_fns.half_open_cleanup_callback)
 246             app->cb_fns.half_open_cleanup_callback (s);
 247           pool_put_index (app_wrk->half_open_table, s->ho_index);
 248           session_free (s);
 249           break;
 250         case SESSION_CTRL_EVT_APP_ADD_SEGMENT:
 251           app->cb_fns.add_segment_callback (app_wrk->wrk_index,
 252                                             evt->as_u64[1]);
 253           break;
 254         case SESSION_CTRL_EVT_APP_DEL_SEGMENT:
 255           app->cb_fns.del_segment_callback (app_wrk->wrk_index,
 256                                             evt->as_u64[1]);
 257           break;
 258         default:
 259           clib_warning ("unexpected event: %u", evt->event_type);
 260           ASSERT (0);
 261           break;
 262         }
 263       clib_fifo_advance_head (app_wrk->wrk_evts[thread_index], 1);
 264     }
 265
 266   if (!is_builtin)
 267     {
 268       svm_msg_q_unlock (mq);
 269       if (mq_is_cong && i == n_evts)
 270         app_worker_unset_wrk_mq_congested (app_wrk, thread_index);
 271     }
 272
 273   return 0;
 274 }
 275
 276 int
 277 app_wrk_flush_wrk_events (app_worker_t *app_wrk, u32 thread_index)
 278 {
 279   if (app_worker_application_is_builtin (app_wrk))
 280     return app_worker_flush_events_inline (app_wrk, thread_index,
 281                                            1 /* is_builtin */);
 282   else
 283     return app_worker_flush_events_inline (app_wrk, thread_index,
 284                                            0 /* is_builtin */);
 285 }
 286
 287 static inline int
 288 session_wrk_flush_events (session_worker_t *wrk)
 289 {
 290   app_worker_t *app_wrk;
 291   uword app_wrk_index;
 292   u32 thread_index;
 293
 294   thread_index = wrk->vm->thread_index;
 295   app_wrk_index = clib_bitmap_first_set (wrk->app_wrks_pending_ntf);
 296
 297   while (app_wrk_index != ~0)
 298     {
 299       app_wrk = app_worker_get_if_valid (app_wrk_index);
 300       /* app_wrk events are flushed on free, so should be valid here */
 301       ASSERT (app_wrk != 0);
 302       app_wrk_flush_wrk_events (app_wrk, thread_index);
 303
 304       if (!clib_fifo_elts (app_wrk->wrk_evts[thread_index]))
 305         clib_bitmap_set (wrk->app_wrks_pending_ntf, app_wrk->wrk_index, 0);
 306
 307       app_wrk_index =
 308         clib_bitmap_next_set (wrk->app_wrks_pending_ntf, app_wrk_index + 1);
 309     }
 310
 311   if (!clib_bitmap_is_zero (wrk->app_wrks_pending_ntf))
 312     vlib_node_set_interrupt_pending (wrk->vm, session_input_node.index);
 313
 314   return 0;
 315 }
 316
 317 VLIB_NODE_FN (session_input_node)
 318 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
 319 {
 320   u32 thread_index = vm->thread_index;
 321   session_worker_t *wrk;
 322
 323   wrk = session_main_get_worker (thread_index);
 324   session_wrk_flush_events (wrk);
 325
 326   return 0;
 327 }
 328
 329 VLIB_REGISTER_NODE (session_input_node) = {
 330   .name = "session-input",
 331   .type = VLIB_NODE_TYPE_INPUT,
 332   .state = VLIB_NODE_STATE_DISABLED,
 333 };
 334
 335 /*
 336  * fd.io coding-style-patch-verification: ON
 337  *
 338  * Local Variables:
 339  * eval: (c-set-style "gnu")
 340  * End:
 341  */