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, was_closed;
  81   session_event_t *evt;
  82   u32 n_evts = 128, i;
  83   session_t *s;
  84   int rv;
  85
  86   n_evts = clib_min (n_evts, clib_fifo_elts (app_wrk->wrk_evts[thread_index]));
  87
  88   if (!is_builtin)
  89     {
  90       mq_is_cong = app_worker_mq_is_congested (app_wrk);
  91       if (mq_try_lock (mq))
  92         {
  93           app_worker_set_mq_wrk_congested (app_wrk, thread_index);
  94           return 0;
  95         }
  96     }
  97
  98   for (i = 0; i < n_evts; i++)
  99     {
 100       evt = clib_fifo_head (app_wrk->wrk_evts[thread_index]);
 101       if (!is_builtin)
 102         {
 103           ring_index = mq_event_ring_index (evt->event_type);
 104           if (svm_msg_q_or_ring_is_full (mq, ring_index))
 105             {
 106               app_worker_set_mq_wrk_congested (app_wrk, thread_index);
 107               break;
 108             }
 109         }
 110
 111       switch (evt->event_type)
 112         {
 113         case SESSION_IO_EVT_RX:
 114           s = session_get (evt->session_index, thread_index);
 115           s->flags &= ~SESSION_F_RX_EVT;
 116           /* Application didn't confirm accept yet */
 117           if (PREDICT_FALSE (s->session_state == SESSION_STATE_ACCEPTING))
 118             break;
 119           app->cb_fns.builtin_app_rx_callback (s);
 120           break;
 121         /* Handle sessions that might not be on current thread */
 122         case SESSION_IO_EVT_BUILTIN_RX:
 123           s = session_get_from_handle_if_valid (evt->session_handle);
 124           if (!s || s->session_state == SESSION_STATE_ACCEPTING)
 125             break;
 126           s->flags &= ~SESSION_F_RX_EVT;
 127           app->cb_fns.builtin_app_rx_callback (s);
 128           break;
 129         case SESSION_IO_EVT_TX:
 130           s = session_get (evt->session_index, thread_index);
 131           app->cb_fns.builtin_app_tx_callback (s);
 132           break;
 133         case SESSION_IO_EVT_TX_MAIN:
 134           s = session_get_from_handle_if_valid (evt->session_handle);
 135           if (!s)
 136             break;
 137           app->cb_fns.builtin_app_tx_callback (s);
 138           break;
 139         case SESSION_CTRL_EVT_BOUND:
 140           /* No app cb function currently */
 141           if (is_builtin)
 142             break;
 143           mq_send_session_bound_cb (app_wrk->wrk_index, evt->as_u64[1] >> 32,
 144                                     evt->session_handle,
 145                                     evt->as_u64[1] & 0xffffffff);
 146           break;
 147         case SESSION_CTRL_EVT_ACCEPTED:
 148           s = session_get (evt->session_index, thread_index);
 149           was_closed = s->session_state >= SESSION_STATE_TRANSPORT_CLOSING;
 150           if (app->cb_fns.session_accept_callback (s))
 151             {
 152               session_close (s);
 153               s->app_wrk_index = SESSION_INVALID_INDEX;
 154               break;
 155             }
 156           if (is_builtin && was_closed)
 157             app_worker_close_notify (app_wrk, s);
 158           break;
 159         case SESSION_CTRL_EVT_CONNECTED:
 160           if (!(evt->as_u64[1] & 0xffffffff))
 161             {
 162               s = session_get (evt->session_index, thread_index);
 163               was_closed = s->session_state >= SESSION_STATE_TRANSPORT_CLOSING;
 164             }
 165           else
 166             s = 0;
 167           rv = app->cb_fns.session_connected_callback (
 168             app_wrk->wrk_index, evt->as_u64[1] >> 32, s,
 169             evt->as_u64[1] & 0xffffffff);
 170           if (!s)
 171             break;
 172           if (rv)
 173             {
 174               session_close (s);
 175               s->app_wrk_index = SESSION_INVALID_INDEX;
 176               break;
 177             }
 178           if (was_closed)
 179             app_worker_close_notify (app_wrk, s);
 180           break;
 181         case SESSION_CTRL_EVT_DISCONNECTED:
 182           s = session_get (evt->session_index, thread_index);
 183           app->cb_fns.session_disconnect_callback (s);
 184           break;
 185         case SESSION_CTRL_EVT_RESET:
 186           s = session_get (evt->session_index, thread_index);
 187           app->cb_fns.session_reset_callback (s);
 188           break;
 189         case SESSION_CTRL_EVT_UNLISTEN_REPLY:
 190           if (is_builtin)
 191             break;
 192           mq_send_unlisten_reply (app_wrk, evt->session_handle,
 193                                   evt->as_u64[1] >> 32,
 194                                   evt->as_u64[1] & 0xffffffff);
 195           break;
 196         case SESSION_CTRL_EVT_MIGRATED:
 197           s = session_get (evt->session_index, thread_index);
 198           app->cb_fns.session_migrate_callback (s, evt->as_u64[1]);
 199           transport_cleanup (session_get_transport_proto (s),
 200                              s->connection_index, s->thread_index);
 201           session_free (s);
 202           /* Notify app that it has data on the new session */
 203           s = session_get_from_handle (evt->as_u64[1]);
 204           session_send_io_evt_to_thread (s->rx_fifo,
 205                                          SESSION_IO_EVT_BUILTIN_RX);
 206           break;
 207         case SESSION_CTRL_EVT_TRANSPORT_CLOSED:
 208           s = session_get (evt->session_index, thread_index);
 209           if (app->cb_fns.session_transport_closed_callback)
 210             app->cb_fns.session_transport_closed_callback (s);
 211           break;
 212         case SESSION_CTRL_EVT_CLEANUP:
 213           s = session_get (evt->as_u64[0] & 0xffffffff, thread_index);
 214           if (app->cb_fns.session_cleanup_callback)
 215             app->cb_fns.session_cleanup_callback (s, evt->as_u64[0] >> 32);
 216           if (evt->as_u64[0] >> 32 != SESSION_CLEANUP_SESSION)
 217             break;
 218           uword_to_pointer (evt->as_u64[1], void (*) (session_t * s)) (s);
 219           break;
 220         case SESSION_CTRL_EVT_HALF_CLEANUP:
 221           s = ho_session_get (evt->session_index);
 222           ASSERT (session_vlib_thread_is_cl_thread ());
 223           if (app->cb_fns.half_open_cleanup_callback)
 224             app->cb_fns.half_open_cleanup_callback (s);
 225           pool_put_index (app_wrk->half_open_table, s->ho_index);
 226           session_free (s);
 227           break;
 228         case SESSION_CTRL_EVT_APP_ADD_SEGMENT:
 229           app->cb_fns.add_segment_callback (app_wrk->wrk_index,
 230                                             evt->as_u64[1]);
 231           break;
 232         case SESSION_CTRL_EVT_APP_DEL_SEGMENT:
 233           app->cb_fns.del_segment_callback (app_wrk->wrk_index,
 234                                             evt->as_u64[1]);
 235           break;
 236         default:
 237           clib_warning ("unexpected event: %u", evt->event_type);
 238           ASSERT (0);
 239           break;
 240         }
 241       clib_fifo_advance_head (app_wrk->wrk_evts[thread_index], 1);
 242     }
 243
 244   if (!is_builtin)
 245     {
 246       svm_msg_q_unlock (mq);
 247       if (mq_is_cong && i == n_evts)
 248         app_worker_unset_wrk_mq_congested (app_wrk, thread_index);
 249     }
 250
 251   return 0;
 252 }
 253
 254 int
 255 app_wrk_flush_wrk_events (app_worker_t *app_wrk, u32 thread_index)
 256 {
 257   if (app_worker_application_is_builtin (app_wrk))
 258     return app_worker_flush_events_inline (app_wrk, thread_index,
 259                                            1 /* is_builtin */);
 260   else
 261     return app_worker_flush_events_inline (app_wrk, thread_index,
 262                                            0 /* is_builtin */);
 263 }
 264
 265 static inline int
 266 session_wrk_flush_events (session_worker_t *wrk)
 267 {
 268   app_worker_t *app_wrk;
 269   uword app_wrk_index;
 270   u32 thread_index;
 271
 272   thread_index = wrk->vm->thread_index;
 273   app_wrk_index = clib_bitmap_first_set (wrk->app_wrks_pending_ntf);
 274
 275   while (app_wrk_index != ~0)
 276     {
 277       app_wrk = app_worker_get_if_valid (app_wrk_index);
 278       /* app_wrk events are flushed on free, so should be valid here */
 279       ASSERT (app_wrk != 0);
 280       app_wrk_flush_wrk_events (app_wrk, thread_index);
 281
 282       if (!clib_fifo_elts (app_wrk->wrk_evts[thread_index]))
 283         clib_bitmap_set (wrk->app_wrks_pending_ntf, app_wrk->wrk_index, 0);
 284
 285       app_wrk_index =
 286         clib_bitmap_next_set (wrk->app_wrks_pending_ntf, app_wrk_index + 1);
 287     }
 288
 289   if (!clib_bitmap_is_zero (wrk->app_wrks_pending_ntf))
 290     vlib_node_set_interrupt_pending (wrk->vm, session_input_node.index);
 291
 292   return 0;
 293 }
 294
 295 VLIB_NODE_FN (session_input_node)
 296 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
 297 {
 298   u32 thread_index = vm->thread_index;
 299   session_worker_t *wrk;
 300
 301   wrk = session_main_get_worker (thread_index);
 302   session_wrk_flush_events (wrk);
 303
 304   return 0;
 305 }
 306
 307 VLIB_REGISTER_NODE (session_input_node) = {
 308   .name = "session-input",
 309   .type = VLIB_NODE_TYPE_INPUT,
 310   .state = VLIB_NODE_STATE_DISABLED,
 311 };
 312
 313 /*
 314  * fd.io coding-style-patch-verification: ON
 315  *
 316  * Local Variables:
 317  * eval: (c-set-style "gnu")
 318  * End:
 319  */