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   session_event_t *evt;
  81   u32 n_evts = 128, i;
  82   u8 ring_index, mq_is_cong;
  83   session_t *s;
  84
  85   n_evts = clib_min (n_evts, clib_fifo_elts (app_wrk->wrk_evts[thread_index]));
  86
  87   if (!is_builtin)
  88     {
  89       mq_is_cong = app_worker_mq_is_congested (app_wrk);
  90       if (mq_try_lock (mq))
  91         {
  92           app_worker_set_mq_wrk_congested (app_wrk, thread_index);
  93           return 0;
  94         }
  95     }
  96
  97   for (i = 0; i < n_evts; i++)
  98     {
  99       evt = clib_fifo_head (app_wrk->wrk_evts[thread_index]);
 100       if (!is_builtin)
 101         {
 102           ring_index = mq_event_ring_index (evt->event_type);
 103           if (svm_msg_q_or_ring_is_full (mq, ring_index))
 104             {
 105               app_worker_set_mq_wrk_congested (app_wrk, thread_index);
 106               break;
 107             }
 108         }
 109
 110       switch (evt->event_type)
 111         {
 112         case SESSION_IO_EVT_RX:
 113           s = session_get (evt->session_index, thread_index);
 114           s->flags &= ~SESSION_F_RX_EVT;
 115           /* Application didn't confirm accept yet */
 116           if (PREDICT_FALSE (s->session_state == SESSION_STATE_ACCEPTING))
 117             break;
 118           app->cb_fns.builtin_app_rx_callback (s);
 119           break;
 120         /* Handle sessions that might not be on current thread */
 121         case SESSION_IO_EVT_BUILTIN_RX:
 122           s = session_get_from_handle_if_valid (evt->session_handle);
 123           if (!s || s->session_state == SESSION_STATE_ACCEPTING)
 124             break;
 125           app->cb_fns.builtin_app_rx_callback (s);
 126           break;
 127         case SESSION_IO_EVT_TX:
 128           s = session_get (evt->session_index, thread_index);
 129           app->cb_fns.builtin_app_tx_callback (s);
 130           break;
 131         case SESSION_IO_EVT_TX_MAIN:
 132           s = session_get_from_handle_if_valid (evt->session_handle);
 133           if (!s)
 134             break;
 135           app->cb_fns.builtin_app_tx_callback (s);
 136           break;
 137         case SESSION_CTRL_EVT_BOUND:
 138           /* No app cb function currently */
 139           if (is_builtin)
 140             break;
 141           mq_send_session_bound_cb (app_wrk->wrk_index, evt->as_u64[1] >> 32,
 142                                     evt->session_handle,
 143                                     evt->as_u64[1] & 0xffffffff);
 144           break;
 145         case SESSION_CTRL_EVT_ACCEPTED:
 146           s = session_get (evt->session_index, thread_index);
 147           app->cb_fns.session_accept_callback (s);
 148           break;
 149         case SESSION_CTRL_EVT_CONNECTED:
 150           if (!(evt->as_u64[1] & 0xffffffff))
 151             s = session_get (evt->session_index, thread_index);
 152           else
 153             s = 0;
 154           app->cb_fns.session_connected_callback (app_wrk->wrk_index,
 155                                                   evt->as_u64[1] >> 32, s,
 156                                                   evt->as_u64[1] & 0xffffffff);
 157           break;
 158         case SESSION_CTRL_EVT_DISCONNECTED:
 159           s = session_get (evt->session_index, thread_index);
 160           app->cb_fns.session_disconnect_callback (s);
 161           break;
 162         case SESSION_CTRL_EVT_RESET:
 163           s = session_get (evt->session_index, thread_index);
 164           app->cb_fns.session_reset_callback (s);
 165           break;
 166         case SESSION_CTRL_EVT_UNLISTEN_REPLY:
 167           if (is_builtin)
 168             break;
 169           mq_send_unlisten_reply (app_wrk, evt->session_handle,
 170                                   evt->as_u64[1] >> 32,
 171                                   evt->as_u64[1] & 0xffffffff);
 172           break;
 173         case SESSION_CTRL_EVT_MIGRATED:
 174           s = session_get (evt->session_index, thread_index);
 175           app->cb_fns.session_migrate_callback (s, evt->as_u64[1]);
 176           transport_cleanup (session_get_transport_proto (s),
 177                              s->connection_index, s->thread_index);
 178           session_free (s);
 179           /* Notify app that it has data on the new session */
 180           s = session_get_from_handle (evt->as_u64[1]);
 181           session_send_io_evt_to_thread (s->rx_fifo,
 182                                          SESSION_IO_EVT_BUILTIN_RX);
 183           break;
 184         case SESSION_CTRL_EVT_TRANSPORT_CLOSED:
 185           s = session_get (evt->session_index, thread_index);
 186           if (app->cb_fns.session_transport_closed_callback)
 187             app->cb_fns.session_transport_closed_callback (s);
 188           break;
 189         case SESSION_CTRL_EVT_CLEANUP:
 190           s = session_get (evt->as_u64[0] & 0xffffffff, thread_index);
 191           if (app->cb_fns.session_cleanup_callback)
 192             app->cb_fns.session_cleanup_callback (s, evt->as_u64[0] >> 32);
 193           if (evt->as_u64[0] >> 32 != SESSION_CLEANUP_SESSION)
 194             break;
 195           uword_to_pointer (evt->as_u64[1], void (*) (session_t * s)) (s);
 196           break;
 197         case SESSION_CTRL_EVT_HALF_CLEANUP:
 198           s = ho_session_get (evt->session_index);
 199           ASSERT (session_vlib_thread_is_cl_thread ());
 200           if (app->cb_fns.half_open_cleanup_callback)
 201             app->cb_fns.half_open_cleanup_callback (s);
 202           pool_put_index (app_wrk->half_open_table, s->ho_index);
 203           session_free (s);
 204           break;
 205         case SESSION_CTRL_EVT_APP_ADD_SEGMENT:
 206           app->cb_fns.add_segment_callback (app_wrk->wrk_index,
 207                                             evt->as_u64[1]);
 208           break;
 209         case SESSION_CTRL_EVT_APP_DEL_SEGMENT:
 210           app->cb_fns.del_segment_callback (app_wrk->wrk_index,
 211                                             evt->as_u64[1]);
 212           break;
 213         default:
 214           clib_warning ("unexpected event: %u", evt->event_type);
 215           ASSERT (0);
 216           break;
 217         }
 218       clib_fifo_advance_head (app_wrk->wrk_evts[thread_index], 1);
 219     }
 220
 221   if (!is_builtin)
 222     {
 223       svm_msg_q_unlock (mq);
 224       if (mq_is_cong && i == n_evts)
 225         app_worker_unset_wrk_mq_congested (app_wrk, thread_index);
 226     }
 227
 228   return 0;
 229 }
 230
 231 int
 232 app_wrk_flush_wrk_events (app_worker_t *app_wrk, u32 thread_index)
 233 {
 234   if (app_worker_application_is_builtin (app_wrk))
 235     return app_worker_flush_events_inline (app_wrk, thread_index,
 236                                            1 /* is_builtin */);
 237   else
 238     return app_worker_flush_events_inline (app_wrk, thread_index,
 239                                            0 /* is_builtin */);
 240 }
 241
 242 static inline int
 243 session_wrk_flush_events (session_worker_t *wrk)
 244 {
 245   app_worker_t *app_wrk;
 246   uword app_wrk_index;
 247   u32 thread_index;
 248
 249   thread_index = wrk->vm->thread_index;
 250   app_wrk_index = clib_bitmap_first_set (wrk->app_wrks_pending_ntf);
 251
 252   while (app_wrk_index != ~0)
 253     {
 254       app_wrk = app_worker_get_if_valid (app_wrk_index);
 255       /* app_wrk events are flushed on free, so should be valid here */
 256       ASSERT (app_wrk != 0);
 257       app_wrk_flush_wrk_events (app_wrk, thread_index);
 258
 259       if (!clib_fifo_elts (app_wrk->wrk_evts[thread_index]))
 260         clib_bitmap_set (wrk->app_wrks_pending_ntf, app_wrk->wrk_index, 0);
 261
 262       app_wrk_index =
 263         clib_bitmap_next_set (wrk->app_wrks_pending_ntf, app_wrk_index + 1);
 264     }
 265
 266   if (!clib_bitmap_is_zero (wrk->app_wrks_pending_ntf))
 267     vlib_node_set_interrupt_pending (wrk->vm, session_input_node.index);
 268
 269   return 0;
 270 }
 271
 272 VLIB_NODE_FN (session_input_node)
 273 (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
 274 {
 275   u32 thread_index = vm->thread_index;
 276   session_worker_t *wrk;
 277
 278   wrk = session_main_get_worker (thread_index);
 279   session_wrk_flush_events (wrk);
 280
 281   return 0;
 282 }
 283
 284 VLIB_REGISTER_NODE (session_input_node) = {
 285   .name = "session-input",
 286   .type = VLIB_NODE_TYPE_INPUT,
 287   .state = VLIB_NODE_STATE_DISABLED,
 288 };
 289
 290 /*
 291  * fd.io coding-style-patch-verification: ON
 292  *
 293  * Local Variables:
 294  * eval: (c-set-style "gnu")
 295  * End:
 296  */