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/* SPDX-License-Identifier: Apache-2.0
* Copyright(c) 2023 Cisco Systems, Inc.
*/
#include <vnet/session/session.h>
#include <vnet/session/application.h>
static inline int
mq_try_lock (svm_msg_q_t *mq)
{
int rv, n_try = 0;
while (n_try < 100)
{
rv = svm_msg_q_try_lock (mq);
if (!rv)
return 0;
n_try += 1;
usleep (1);
}
return -1;
}
always_inline u8
mq_event_ring_index (session_evt_type_t et)
{
return (et >= SESSION_CTRL_EVT_RPC ? SESSION_MQ_CTRL_EVT_RING :
SESSION_MQ_IO_EVT_RING);
}
void
app_worker_del_all_events (app_worker_t *app_wrk)
{
session_worker_t *wrk;
session_event_t *evt;
u32 thread_index;
session_t *s;
for (thread_index = 0; thread_index < vec_len (app_wrk->wrk_evts);
thread_index++)
{
while (clib_fifo_elts (app_wrk->wrk_evts[thread_index]))
{
clib_fifo_sub2 (app_wrk->wrk_evts[thread_index], evt);
switch (evt->event_type)
{
case SESSION_CTRL_EVT_MIGRATED:
s = session_get (evt->session_index, thread_index);
transport_cleanup (session_get_transport_proto (s),
s->connection_index, s->thread_index);
session_free (s);
break;
case SESSION_CTRL_EVT_CLEANUP:
s = session_get (evt->as_u64[0] & 0xffffffff, thread_index);
if (evt->as_u64[0] >> 32 != SESSION_CLEANUP_SESSION)
break;
uword_to_pointer (evt->as_u64[1], void (*) (session_t * s)) (s);
break;
case SESSION_CTRL_EVT_HALF_CLEANUP:
s = ho_session_get (evt->session_index);
pool_put_index (app_wrk->half_open_table, s->ho_index);
session_free (s);
break;
default:
break;
}
}
wrk = session_main_get_worker (thread_index);
clib_bitmap_set (wrk->app_wrks_pending_ntf, app_wrk->wrk_index, 0);
}
}
always_inline int
app_worker_flush_events_inline (app_worker_t *app_wrk, u32 thread_index,
u8 is_builtin)
{
application_t *app = application_get (app_wrk->app_index);
svm_msg_q_t *mq = app_wrk->event_queue;
u8 ring_index, mq_is_cong;
session_state_t old_state;
session_event_t *evt;
u32 n_evts = 128, i;
session_t *s;
int rv;
n_evts = clib_min (n_evts, clib_fifo_elts (app_wrk->wrk_evts[thread_index]));
if (!is_builtin)
{
mq_is_cong = app_worker_mq_is_congested (app_wrk);
if (mq_try_lock (mq))
{
app_worker_set_mq_wrk_congested (app_wrk, thread_index);
return 0;
}
}
for (i = 0; i < n_evts; i++)
{
evt = clib_fifo_head (app_wrk->wrk_evts[thread_index]);
if (!is_builtin)
{
ring_index = mq_event_ring_index (evt->event_type);
if (svm_msg_q_or_ring_is_full (mq, ring_index))
{
app_worker_set_mq_wrk_congested (app_wrk, thread_index);
break;
}
}
switch (evt->event_type)
{
case SESSION_IO_EVT_RX:
s = session_get (evt->session_index, thread_index);
s->flags &= ~SESSION_F_RX_EVT;
/* Application didn't confirm accept yet */
if (PREDICT_FALSE (s->session_state == SESSION_STATE_ACCEPTING ||
s->session_state == SESSION_STATE_CONNECTING))
break;
app->cb_fns.builtin_app_rx_callback (s);
break;
/* Handle sessions that might not be on current thread */
case SESSION_IO_EVT_BUILTIN_RX:
s = session_get_from_handle_if_valid (evt->session_handle);
if (!s)
break;
s->flags &= ~SESSION_F_RX_EVT;
if (PREDICT_FALSE (s->session_state == SESSION_STATE_ACCEPTING ||
s->session_state == SESSION_STATE_CONNECTING))
break;
app->cb_fns.builtin_app_rx_callback (s);
break;
case SESSION_IO_EVT_TX:
s = session_get (evt->session_index, thread_index);
app->cb_fns.builtin_app_tx_callback (s);
break;
case SESSION_IO_EVT_TX_MAIN:
s = session_get_from_handle_if_valid (evt->session_handle);
if (!s)
break;
app->cb_fns.builtin_app_tx_callback (s);
break;
case SESSION_CTRL_EVT_BOUND:
/* No app cb function currently */
if (is_builtin)
break;
mq_send_session_bound_cb (app_wrk->wrk_index, evt->as_u64[1] >> 32,
evt->session_handle,
evt->as_u64[1] & 0xffffffff);
break;
case SESSION_CTRL_EVT_ACCEPTED:
s = session_get (evt->session_index, thread_index);
old_state = s->session_state;
if (app->cb_fns.session_accept_callback (s))
{
session_close (s);
s->app_wrk_index = SESSION_INVALID_INDEX;
break;
}
if (is_builtin)
{
if (old_state >= SESSION_STATE_TRANSPORT_CLOSING)
{
session_set_state (s, old_state);
app_worker_close_notify (app_wrk, s);
}
}
break;
case SESSION_CTRL_EVT_CONNECTED:
if (!(evt->as_u64[1] & 0xffffffff))
{
s = session_get (evt->session_index, thread_index);
old_state = s->session_state;
}
else
s = 0;
rv = app->cb_fns.session_connected_callback (
app_wrk->wrk_index, evt->as_u64[1] >> 32, s,
evt->as_u64[1] & 0xffffffff);
if (!s)
break;
if (rv)
{
session_close (s);
s->app_wrk_index = SESSION_INVALID_INDEX;
break;
}
if (old_state >= SESSION_STATE_TRANSPORT_CLOSING)
{
session_set_state (s, old_state);
app_worker_close_notify (app_wrk, s);
}
break;
case SESSION_CTRL_EVT_DISCONNECTED:
s = session_get (evt->session_index, thread_index);
app->cb_fns.session_disconnect_callback (s);
break;
case SESSION_CTRL_EVT_RESET:
s = session_get (evt->session_index, thread_index);
app->cb_fns.session_reset_callback (s);
break;
case SESSION_CTRL_EVT_UNLISTEN_REPLY:
if (is_builtin)
break;
mq_send_unlisten_reply (app_wrk, evt->session_handle,
evt->as_u64[1] >> 32,
evt->as_u64[1] & 0xffffffff);
break;
case SESSION_CTRL_EVT_MIGRATED:
s = session_get (evt->session_index, thread_index);
app->cb_fns.session_migrate_callback (s, evt->as_u64[1]);
transport_cleanup (session_get_transport_proto (s),
s->connection_index, s->thread_index);
session_free (s);
/* Notify app that it has data on the new session */
s = session_get_from_handle (evt->as_u64[1]);
session_send_io_evt_to_thread (s->rx_fifo,
SESSION_IO_EVT_BUILTIN_RX);
break;
case SESSION_CTRL_EVT_TRANSPORT_CLOSED:
s = session_get (evt->session_index, thread_index);
if (app->cb_fns.session_transport_closed_callback)
app->cb_fns.session_transport_closed_callback (s);
break;
case SESSION_CTRL_EVT_CLEANUP:
s = session_get (evt->as_u64[0] & 0xffffffff, thread_index);
if (app->cb_fns.session_cleanup_callback)
app->cb_fns.session_cleanup_callback (s, evt->as_u64[0] >> 32);
if (evt->as_u64[0] >> 32 != SESSION_CLEANUP_SESSION)
break;
uword_to_pointer (evt->as_u64[1], void (*) (session_t * s)) (s);
break;
case SESSION_CTRL_EVT_HALF_CLEANUP:
s = ho_session_get (evt->session_index);
ASSERT (session_vlib_thread_is_cl_thread ());
if (app->cb_fns.half_open_cleanup_callback)
app->cb_fns.half_open_cleanup_callback (s);
pool_put_index (app_wrk->half_open_table, s->ho_index);
session_free (s);
break;
case SESSION_CTRL_EVT_APP_ADD_SEGMENT:
app->cb_fns.add_segment_callback (app_wrk->wrk_index,
evt->as_u64[1]);
break;
case SESSION_CTRL_EVT_APP_DEL_SEGMENT:
app->cb_fns.del_segment_callback (app_wrk->wrk_index,
evt->as_u64[1]);
break;
default:
clib_warning ("unexpected event: %u", evt->event_type);
ASSERT (0);
break;
}
clib_fifo_advance_head (app_wrk->wrk_evts[thread_index], 1);
}
if (!is_builtin)
{
svm_msg_q_unlock (mq);
if (mq_is_cong && i == n_evts)
app_worker_unset_wrk_mq_congested (app_wrk, thread_index);
}
return 0;
}
int
app_wrk_flush_wrk_events (app_worker_t *app_wrk, u32 thread_index)
{
if (app_worker_application_is_builtin (app_wrk))
return app_worker_flush_events_inline (app_wrk, thread_index,
1 /* is_builtin */);
else
return app_worker_flush_events_inline (app_wrk, thread_index,
0 /* is_builtin */);
}
static inline int
session_wrk_flush_events (session_worker_t *wrk)
{
app_worker_t *app_wrk;
uword app_wrk_index;
u32 thread_index;
thread_index = wrk->vm->thread_index;
app_wrk_index = clib_bitmap_first_set (wrk->app_wrks_pending_ntf);
while (app_wrk_index != ~0)
{
app_wrk = app_worker_get_if_valid (app_wrk_index);
/* app_wrk events are flushed on free, so should be valid here */
ASSERT (app_wrk != 0);
app_wrk_flush_wrk_events (app_wrk, thread_index);
if (!clib_fifo_elts (app_wrk->wrk_evts[thread_index]))
clib_bitmap_set (wrk->app_wrks_pending_ntf, app_wrk->wrk_index, 0);
app_wrk_index =
clib_bitmap_next_set (wrk->app_wrks_pending_ntf, app_wrk_index + 1);
}
if (!clib_bitmap_is_zero (wrk->app_wrks_pending_ntf))
vlib_node_set_interrupt_pending (wrk->vm, session_input_node.index);
return 0;
}
VLIB_NODE_FN (session_input_node)
(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
{
u32 thread_index = vm->thread_index;
session_worker_t *wrk;
wrk = session_main_get_worker (thread_index);
session_wrk_flush_events (wrk);
return 0;
}
VLIB_REGISTER_NODE (session_input_node) = {
.name = "session-input",
.type = VLIB_NODE_TYPE_INPUT,
.state = VLIB_NODE_STATE_DISABLED,
};
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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