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           mq_send_session_bound_cb (app_wrk->wrk_index, evt->as_u64[1] >> 32,
 149                                     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, old_state);
 166                   app_worker_close_notify (app_wrk, s);
 167                 }
 168             }
 169           break;
 170         case SESSION_CTRL_EVT_CONNECTED:
 171           if (!(evt->as_u64[1] & 0xffffffff))
 172             {
 173               s = session_get (evt->session_index, thread_index);
 174               old_state = s->session_state;
 175             }
 176           else
 177             s = 0;
 178           rv = app->cb_fns.session_connected_callback (
 179             app_wrk->wrk_index, evt->as_u64[1] >> 32, s,
 180             evt->as_u64[1] & 0xffffffff);
 181           if (!s)
 182             break;
 183           if (rv)
 184             {
 185               session_close (s);
 186               s->app_wrk_index = SESSION_INVALID_INDEX;
 187               break;
 188             }
 189           if (old_state >= SESSION_STATE_TRANSPORT_CLOSING)
 190             {
 191               session_set_state (s, old_state);
 192               app_worker_close_notify (app_wrk, s);
 193             }
 194           break;
 195         case SESSION_CTRL_EVT_DISCONNECTED:
 196           s = session_get (evt->session_index, thread_index);
 197           app->cb_fns.session_disconnect_callback (s);
 198           break;
 199         case SESSION_CTRL_EVT_RESET:
 200           s = session_get (evt->session_index, thread_index);
 201           app->cb_fns.session_reset_callback (s);
 202           break;
 203         case SESSION_CTRL_EVT_UNLISTEN_REPLY:
 204           if (is_builtin)
 205             break;
 206           mq_send_unlisten_reply (app_wrk, evt->session_handle,
 207                                   evt->as_u64[1] >> 32,
 208                                   evt->as_u64[1] & 0xffffffff);
 209           break;
 210         case SESSION_CTRL_EVT_MIGRATED:
 211           s = session_get (evt->session_index, thread_index);
 212           app->cb_fns.session_migrate_callback (s, evt->as_u64[1]);
 213           transport_cleanup (session_get_transport_proto (s),
 214                              s->connection_index, s->thread_index);
 215           session_free (s);
 216           /* Notify app that it has data on the new session */
 217           s = session_get_from_handle (evt->as_u64[1]);
 218           session_send_io_evt_to_thread (s->rx_fifo,
 219                                          SESSION_IO_EVT_BUILTIN_RX);
 220           break;
 221         case SESSION_CTRL_EVT_TRANSPORT_CLOSED:
 222           s = session_get (evt->session_index, thread_index);
 223           if (app->cb_fns.session_transport_closed_callback)
 224             app->cb_fns.session_transport_closed_callback (s);
 225           break;
 226         case SESSION_CTRL_EVT_CLEANUP:
 227           s = session_get (evt->as_u64[0] & 0xffffffff, thread_index);
 228           if (app->cb_fns.session_cleanup_callback)
 229             app->cb_fns.session_cleanup_callback (s, evt->as_u64[0] >> 32);
 230           if (evt->as_u64[0] >> 32 != SESSION_CLEANUP_SESSION)
 231             break;
 232           uword_to_pointer (evt->as_u64[1], void (*) (session_t * s)) (s);
 233           break;
 234         case SESSION_CTRL_EVT_HALF_CLEANUP:
 235           s = ho_session_get (evt->session_index);
 236           ASSERT (session_vlib_thread_is_cl_thread ());
 237           if (app->cb_fns.half_open_cleanup_callback)
 238             app->cb_fns.half_open_cleanup_callback (s);
 239           pool_put_index (app_wrk->half_open_table, s->ho_index);
 240           session_free (s);
 241           break;
 242         case SESSION_CTRL_EVT_APP_ADD_SEGMENT:
 243           app->cb_fns.add_segment_callback (app_wrk->wrk_index,
 244                                             evt->as_u64[1]);
 245           break;
 246         case SESSION_CTRL_EVT_APP_DEL_SEGMENT:
 247           app->cb_fns.del_segment_callback (app_wrk->wrk_index,
 248                                             evt->as_u64[1]);
 249           break;
 250         default:
 251           clib_warning ("unexpected event: %u", evt->event_type);
 252           ASSERT (0);
 253           break;
 254         }
 255       clib_fifo_advance_head (app_wrk->wrk_evts[thread_index], 1);
 256     }
 257
 258   if (!is_builtin)
 259     {
 260       svm_msg_q_unlock (mq);
 261       if (mq_is_cong && i == n_evts)
 262         app_worker_unset_wrk_mq_congested (app_wrk, thread_index);
 263     }
 264
 265   return 0;
 266 }
 267
 268 int
 269 app_wrk_flush_wrk_events (app_worker_t *app_wrk, u32 thread_index)
 270 {
 271   if (app_worker_application_is_builtin (app_wrk))
 272     return app_worker_flush_events_inline (app_wrk, thread_index,
 273                                            1 /* is_builtin */);
 274   else
 275     return app_worker_flush_events_inline (app_wrk, thread_index,
 276                                            0 /* is_builtin */);
 277 }
 278
 279 static inline int
 280 session_wrk_flush_events (session_worker_t *wrk)
 281 {
 282   app_worker_t *app_wrk;
 283   uword app_wrk_index;
 284   u32 thread_index;
 285
 286   thread_index = wrk->vm->thread_index;
 287   app_wrk_index = clib_bitmap_first_set (wrk->app_wrks_pending_ntf);
 288
 289   while (app_wrk_index != ~0)
 290     {
 291       app_wrk = app_worker_get_if_valid (app_wrk_index);
 292       /* app_wrk events are flushed on free, so should be valid here */
 293       ASSERT (app_wrk != 0);
 294       app_wrk_flush_wrk_events (app_wrk, thread_index);
 295
 296       if (!clib_fifo_elts (app_wrk->wrk_evts[thread_index]))
 297         clib_bitmap_set (wrk->app_wrks_pending_ntf, app_wrk->wrk_index, 0);
 298
 299       app_wrk_index =
 300         clib_bitmap_next_set (wrk->app_wrks_pending_ntf, app_wrk_index + 1);
 301     }
 302
 303   if (!clib_bitmap_is_zero (wrk->app_wrks_pending_ntf))
 304     vlib_node_set_interrupt_pending (wrk->vm, session_input_node.index);
 305
 306   return 0;
 307 }
 308
 309 VLIB_NODE_FN (session_input_node)
 310 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
 311 {
 312   u32 thread_index = vm->thread_index;
 313   session_worker_t *wrk;
 314
 315   wrk = session_main_get_worker (thread_index);
 316   session_wrk_flush_events (wrk);
 317
 318   return 0;
 319 }
 320
 321 VLIB_REGISTER_NODE (session_input_node) = {
 322   .name = "session-input",
 323   .type = VLIB_NODE_TYPE_INPUT,
 324   .state = VLIB_NODE_STATE_DISABLED,
 325 };
 326
 327 /*
 328  * fd.io coding-style-patch-verification: ON
 329  *
 330  * Local Variables:
 331  * eval: (c-set-style "gnu")
 332  * End:
 333  */