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           s->flags &= ~SESSION_F_RX_EVT;
 117           /* Application didn't confirm accept yet */
 118           if (PREDICT_FALSE (s->session_state == SESSION_STATE_ACCEPTING ||
 119                              s->session_state == SESSION_STATE_CONNECTING))
 120             break;
 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)
 127             break;
 128           s->flags &= ~SESSION_F_RX_EVT;
 129           if (PREDICT_FALSE (s->session_state == SESSION_STATE_ACCEPTING ||
 130                              s->session_state == SESSION_STATE_CONNECTING))
 131             break;
 132           app->cb_fns.builtin_app_rx_callback (s);
 133           break;
 134         case SESSION_IO_EVT_TX:
 135           s = session_get (evt->session_index, thread_index);
 136           app->cb_fns.builtin_app_tx_callback (s);
 137           break;
 138         case SESSION_IO_EVT_TX_MAIN:
 139           s = session_get_from_handle_if_valid (evt->session_handle);
 140           if (!s)
 141             break;
 142           app->cb_fns.builtin_app_tx_callback (s);
 143           break;
 144         case SESSION_CTRL_EVT_BOUND:
 145           /* No app cb function currently */
 146           if (is_builtin)
 147             break;
 148           app->cb_fns.session_listened_callback (
 149             app_wrk->wrk_index, evt->as_u64[1] >> 32, evt->session_handle,
 150             evt->as_u64[1] & 0xffffffff);
 151           break;
 152         case SESSION_CTRL_EVT_ACCEPTED:
 153           s = session_get (evt->session_index, thread_index);
 154           old_state = s->session_state;
 155           if (app->cb_fns.session_accept_callback (s))
 156             {
 157               session_close (s);
 158               s->app_wrk_index = SESSION_INVALID_INDEX;
 159               break;
 160             }
 161           if (is_builtin)
 162             {
 163               if (old_state >= SESSION_STATE_TRANSPORT_CLOSING)
 164                 {
 165                   session_set_state (s,
 166                                      clib_max (old_state, s->session_state));
 167                   if (!(s->flags & SESSION_F_APP_CLOSED))
 168                     app->cb_fns.session_disconnect_callback (s);
 169                 }
 170             }
 171           break;
 172         case SESSION_CTRL_EVT_CONNECTED:
 173           if (!(evt->as_u64[1] & 0xffffffff))
 174             {
 175               s = session_get (evt->session_index, thread_index);
 176               old_state = s->session_state;
 177             }
 178           else
 179             s = 0;
 180           rv = app->cb_fns.session_connected_callback (
 181             app_wrk->wrk_index, evt->as_u64[1] >> 32, s,
 182             evt->as_u64[1] & 0xffffffff);
 183           if (!s)
 184             break;
 185           if (rv)
 186             {
 187               session_close (s);
 188               s->app_wrk_index = SESSION_INVALID_INDEX;
 189               break;
 190             }
 191           if (old_state >= SESSION_STATE_TRANSPORT_CLOSING)
 192             {
 193               session_set_state (s, clib_max (old_state, s->session_state));
 194               if (!(s->flags & SESSION_F_APP_CLOSED))
 195                 app->cb_fns.session_disconnect_callback (s);
 196             }
 197           break;
 198         case SESSION_CTRL_EVT_DISCONNECTED:
 199           s = session_get (evt->session_index, thread_index);
 200           if (!(s->flags & SESSION_F_APP_CLOSED))
 201             app->cb_fns.session_disconnect_callback (s);
 202           break;
 203         case SESSION_CTRL_EVT_RESET:
 204           s = session_get (evt->session_index, thread_index);
 205           if (!(s->flags & SESSION_F_APP_CLOSED))
 206             app->cb_fns.session_reset_callback (s);
 207           break;
 208         case SESSION_CTRL_EVT_UNLISTEN_REPLY:
 209           if (is_builtin)
 210             break;
 211           app->cb_fns.session_unlistened_callback (
 212             app_wrk->wrk_index, evt->session_handle, evt->as_u64[1] >> 32,
 213             evt->as_u64[1] & 0xffffffff);
 214           break;
 215         case SESSION_CTRL_EVT_MIGRATED:
 216           s = session_get (evt->session_index, thread_index);
 217           app->cb_fns.session_migrate_callback (s, evt->as_u64[1]);
 218           transport_cleanup (session_get_transport_proto (s),
 219                              s->connection_index, s->thread_index);
 220           session_free (s);
 221           /* Notify app that it has data on the new session */
 222           s = session_get_from_handle (evt->as_u64[1]);
 223           session_send_io_evt_to_thread (s->rx_fifo,
 224                                          SESSION_IO_EVT_BUILTIN_RX);
 225           break;
 226         case SESSION_CTRL_EVT_TRANSPORT_CLOSED:
 227           s = session_get (evt->session_index, thread_index);
 228           if (app->cb_fns.session_transport_closed_callback)
 229             app->cb_fns.session_transport_closed_callback (s);
 230           break;
 231         case SESSION_CTRL_EVT_CLEANUP:
 232           s = session_get (evt->as_u64[0] & 0xffffffff, thread_index);
 233           if (app->cb_fns.session_cleanup_callback)
 234             app->cb_fns.session_cleanup_callback (s, evt->as_u64[0] >> 32);
 235           if (evt->as_u64[0] >> 32 != SESSION_CLEANUP_SESSION)
 236             break;
 237           uword_to_pointer (evt->as_u64[1], void (*) (session_t * s)) (s);
 238           break;
 239         case SESSION_CTRL_EVT_HALF_CLEANUP:
 240           s = ho_session_get (evt->session_index);
 241           ASSERT (session_vlib_thread_is_cl_thread ());
 242           if (app->cb_fns.half_open_cleanup_callback)
 243             app->cb_fns.half_open_cleanup_callback (s);
 244           pool_put_index (app_wrk->half_open_table, s->ho_index);
 245           session_free (s);
 246           break;
 247         case SESSION_CTRL_EVT_APP_ADD_SEGMENT:
 248           app->cb_fns.add_segment_callback (app_wrk->wrk_index,
 249                                             evt->as_u64[1]);
 250           break;
 251         case SESSION_CTRL_EVT_APP_DEL_SEGMENT:
 252           app->cb_fns.del_segment_callback (app_wrk->wrk_index,
 253                                             evt->as_u64[1]);
 254           break;
 255         default:
 256           clib_warning ("unexpected event: %u", evt->event_type);
 257           ASSERT (0);
 258           break;
 259         }
 260       clib_fifo_advance_head (app_wrk->wrk_evts[thread_index], 1);
 261     }
 262
 263   if (!is_builtin)
 264     {
 265       svm_msg_q_unlock (mq);
 266       if (mq_is_cong && i == n_evts)
 267         app_worker_unset_wrk_mq_congested (app_wrk, thread_index);
 268     }
 269
 270   return 0;
 271 }
 272
 273 int
 274 app_wrk_flush_wrk_events (app_worker_t *app_wrk, u32 thread_index)
 275 {
 276   if (app_worker_application_is_builtin (app_wrk))
 277     return app_worker_flush_events_inline (app_wrk, thread_index,
 278                                            1 /* is_builtin */);
 279   else
 280     return app_worker_flush_events_inline (app_wrk, thread_index,
 281                                            0 /* is_builtin */);
 282 }
 283
 284 static inline int
 285 session_wrk_flush_events (session_worker_t *wrk)
 286 {
 287   app_worker_t *app_wrk;
 288   uword app_wrk_index;
 289   u32 thread_index;
 290
 291   thread_index = wrk->vm->thread_index;
 292   app_wrk_index = clib_bitmap_first_set (wrk->app_wrks_pending_ntf);
 293
 294   while (app_wrk_index != ~0)
 295     {
 296       app_wrk = app_worker_get_if_valid (app_wrk_index);
 297       /* app_wrk events are flushed on free, so should be valid here */
 298       ASSERT (app_wrk != 0);
 299       app_wrk_flush_wrk_events (app_wrk, thread_index);
 300
 301       if (!clib_fifo_elts (app_wrk->wrk_evts[thread_index]))
 302         clib_bitmap_set (wrk->app_wrks_pending_ntf, app_wrk->wrk_index, 0);
 303
 304       app_wrk_index =
 305         clib_bitmap_next_set (wrk->app_wrks_pending_ntf, app_wrk_index + 1);
 306     }
 307
 308   if (!clib_bitmap_is_zero (wrk->app_wrks_pending_ntf))
 309     vlib_node_set_interrupt_pending (wrk->vm, session_input_node.index);
 310
 311   return 0;
 312 }
 313
 314 VLIB_NODE_FN (session_input_node)
 315 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
 316 {
 317   u32 thread_index = vm->thread_index;
 318   session_worker_t *wrk;
 319
 320   wrk = session_main_get_worker (thread_index);
 321   session_wrk_flush_events (wrk);
 322
 323   return 0;
 324 }
 325
 326 VLIB_REGISTER_NODE (session_input_node) = {
 327   .name = "session-input",
 328   .type = VLIB_NODE_TYPE_INPUT,
 329   .state = VLIB_NODE_STATE_DISABLED,
 330 };
 331
 332 /*
 333  * fd.io coding-style-patch-verification: ON
 334  *
 335  * Local Variables:
 336  * eval: (c-set-style "gnu")
 337  * End:
 338  */