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