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66d4cb5a217d556aa7bd2471f02a39badb6d5cd2
vpp/src/vnet/session/session.c
Damjan Marion 66d4cb5a21 vppinfra: refactor *_will_expand() functions 
Type: refactor
Change-Id: I3625eacf9e04542ca8778df5d46075a8654642c7
Signed-off-by: Damjan Marion <damarion@cisco.com>
2022-03-18 13:16:36 +00:00

2173 lines
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/*
* Copyright (c) 2017-2019 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @file
* @brief Session and session manager
*/
#include <vnet/session/session.h>
#include <vnet/session/application.h>
#include <vnet/dpo/load_balance.h>
#include <vnet/fib/ip4_fib.h>
session_main_t session_main;
static inline int
session_send_evt_to_thread (void *data, void *args, u32 thread_index,
session_evt_type_t evt_type)
{
session_worker_t *wrk = session_main_get_worker (thread_index);
session_event_t *evt;
svm_msg_q_msg_t msg;
svm_msg_q_t *mq;
mq = wrk->vpp_event_queue;
if (PREDICT_FALSE (svm_msg_q_lock (mq)))
return -1;
if (PREDICT_FALSE (svm_msg_q_is_full (mq)
|| svm_msg_q_ring_is_full (mq, SESSION_MQ_IO_EVT_RING)))
{
svm_msg_q_unlock (mq);
return -2;
}
switch (evt_type)
{
case SESSION_CTRL_EVT_RPC:
msg = svm_msg_q_alloc_msg_w_ring (mq, SESSION_MQ_IO_EVT_RING);
evt = (session_event_t *) svm_msg_q_msg_data (mq, &msg);
evt->rpc_args.fp = data;
evt->rpc_args.arg = args;
break;
case SESSION_IO_EVT_RX:
case SESSION_IO_EVT_TX:
case SESSION_IO_EVT_TX_FLUSH:
case SESSION_IO_EVT_BUILTIN_RX:
msg = svm_msg_q_alloc_msg_w_ring (mq, SESSION_MQ_IO_EVT_RING);
evt = (session_event_t *) svm_msg_q_msg_data (mq, &msg);
evt->session_index = *(u32 *) data;
break;
case SESSION_IO_EVT_BUILTIN_TX:
case SESSION_CTRL_EVT_CLOSE:
case SESSION_CTRL_EVT_RESET:
msg = svm_msg_q_alloc_msg_w_ring (mq, SESSION_MQ_IO_EVT_RING);
evt = (session_event_t *) svm_msg_q_msg_data (mq, &msg);
evt->session_handle = session_handle ((session_t *) data);
break;
default:
clib_warning ("evt unhandled!");
svm_msg_q_unlock (mq);
return -1;
}
evt->event_type = evt_type;
svm_msg_q_add_and_unlock (mq, &msg);
if (PREDICT_FALSE (wrk->state == SESSION_WRK_INTERRUPT))
vlib_node_set_interrupt_pending (wrk->vm, session_queue_node.index);
return 0;
}
int
session_send_io_evt_to_thread (svm_fifo_t * f, session_evt_type_t evt_type)
{
return session_send_evt_to_thread (&f->shr->master_session_index, 0,
f->master_thread_index, evt_type);
}
int
session_send_io_evt_to_thread_custom (void *data, u32 thread_index,
session_evt_type_t evt_type)
{
return session_send_evt_to_thread (data, 0, thread_index, evt_type);
}
int
session_send_ctrl_evt_to_thread (session_t * s, session_evt_type_t evt_type)
{
/* only events supported are disconnect, shutdown and reset */
ASSERT (evt_type == SESSION_CTRL_EVT_CLOSE ||
evt_type == SESSION_CTRL_EVT_HALF_CLOSE ||
evt_type == SESSION_CTRL_EVT_RESET);
return session_send_evt_to_thread (s, 0, s->thread_index, evt_type);
}
void
session_send_rpc_evt_to_thread_force (u32 thread_index, void *fp,
void *rpc_args)
{
session_send_evt_to_thread (fp, rpc_args, thread_index,
SESSION_CTRL_EVT_RPC);
}
void
session_send_rpc_evt_to_thread (u32 thread_index, void *fp, void *rpc_args)
{
if (thread_index != vlib_get_thread_index ())
session_send_rpc_evt_to_thread_force (thread_index, fp, rpc_args);
else
{
void (*fnp) (void *) = fp;
fnp (rpc_args);
}
}
void
session_add_self_custom_tx_evt (transport_connection_t * tc, u8 has_prio)
{
session_t *s = session_get (tc->s_index, tc->thread_index);
ASSERT (s->thread_index == vlib_get_thread_index ());
ASSERT (s->session_state != SESSION_STATE_TRANSPORT_DELETED);
if (!(s->flags & SESSION_F_CUSTOM_TX))
{
s->flags |= SESSION_F_CUSTOM_TX;
if (svm_fifo_set_event (s->tx_fifo)
|| transport_connection_is_descheduled (tc))
{
session_evt_elt_t *elt;
session_worker_t *wrk;
wrk = session_main_get_worker (tc->thread_index);
if (has_prio)
elt = session_evt_alloc_new (wrk);
else
elt = session_evt_alloc_old (wrk);
elt->evt.session_index = tc->s_index;
elt->evt.event_type = SESSION_IO_EVT_TX;
tc->flags &= ~TRANSPORT_CONNECTION_F_DESCHED;
if (PREDICT_FALSE (wrk->state == SESSION_WRK_INTERRUPT))
vlib_node_set_interrupt_pending (wrk->vm,
session_queue_node.index);
}
}
}
void
sesssion_reschedule_tx (transport_connection_t * tc)
{
session_worker_t *wrk = session_main_get_worker (tc->thread_index);
session_evt_elt_t *elt;
ASSERT (tc->thread_index == vlib_get_thread_index ());
elt = session_evt_alloc_new (wrk);
elt->evt.session_index = tc->s_index;
elt->evt.event_type = SESSION_IO_EVT_TX;
if (PREDICT_FALSE (wrk->state == SESSION_WRK_INTERRUPT))
vlib_node_set_interrupt_pending (wrk->vm, session_queue_node.index);
}
static void
session_program_transport_ctrl_evt (session_t * s, session_evt_type_t evt)
{
u32 thread_index = vlib_get_thread_index ();
session_evt_elt_t *elt;
session_worker_t *wrk;
/* If we are in the handler thread, or being called with the worker barrier
* held, just append a new event to pending disconnects vector. */
if (vlib_thread_is_main_w_barrier () || thread_index == s->thread_index)
{
wrk = session_main_get_worker (s->thread_index);
elt = session_evt_alloc_ctrl (wrk);
clib_memset (&elt->evt, 0, sizeof (session_event_t));
elt->evt.session_handle = session_handle (s);
elt->evt.event_type = evt;
if (PREDICT_FALSE (wrk->state == SESSION_WRK_INTERRUPT))
vlib_node_set_interrupt_pending (wrk->vm, session_queue_node.index);
}
else
session_send_ctrl_evt_to_thread (s, evt);
}
session_t *
session_alloc (u32 thread_index)
{
session_worker_t *wrk = &session_main.wrk[thread_index];
session_t *s;
u8 will_expand = pool_get_will_expand (wrk->sessions);
/* If we have peekers, let them finish */
if (PREDICT_FALSE (will_expand && vlib_num_workers ()))
{
clib_rwlock_writer_lock (&wrk->peekers_rw_locks);
pool_get_aligned (wrk->sessions, s, CLIB_CACHE_LINE_BYTES);
clib_rwlock_writer_unlock (&wrk->peekers_rw_locks);
}
else
{
pool_get_aligned (wrk->sessions, s, CLIB_CACHE_LINE_BYTES);
}
clib_memset (s, 0, sizeof (*s));
s->session_index = s - wrk->sessions;
s->thread_index = thread_index;
s->app_index = APP_INVALID_INDEX;
return s;
}
void
session_free (session_t * s)
{
if (CLIB_DEBUG)
{
u8 thread_index = s->thread_index;
clib_memset (s, 0xFA, sizeof (*s));
pool_put (session_main.wrk[thread_index].sessions, s);
return;
}
SESSION_EVT (SESSION_EVT_FREE, s);
pool_put (session_main.wrk[s->thread_index].sessions, s);
}
u8
session_is_valid (u32 si, u8 thread_index)
{
session_t *s;
transport_connection_t *tc;
s = pool_elt_at_index (session_main.wrk[thread_index].sessions, si);
if (s->thread_index != thread_index || s->session_index != si)
return 0;
if (s->session_state == SESSION_STATE_TRANSPORT_DELETED
|| s->session_state <= SESSION_STATE_LISTENING)
return 1;
if (s->session_state == SESSION_STATE_CONNECTING &&
(s->flags & SESSION_F_HALF_OPEN))
return 1;
tc = session_get_transport (s);
if (s->connection_index != tc->c_index
|| s->thread_index != tc->thread_index || tc->s_index != si)
return 0;
return 1;
}
static void
session_cleanup_notify (session_t * s, session_cleanup_ntf_t ntf)
{
app_worker_t *app_wrk;
app_wrk = app_worker_get_if_valid (s->app_wrk_index);
if (!app_wrk)
return;
app_worker_cleanup_notify (app_wrk, s, ntf);
}
void
session_free_w_fifos (session_t * s)
{
session_cleanup_notify (s, SESSION_CLEANUP_SESSION);
segment_manager_dealloc_fifos (s->rx_fifo, s->tx_fifo);
session_free (s);
}
/**
* Cleans up session and lookup table.
*
* Transport connection must still be valid.
*/
static void
session_delete (session_t * s)
{
int rv;
/* Delete from the main lookup table. */
if ((rv = session_lookup_del_session (s)))
clib_warning ("session %u hash delete rv %d", s->session_index, rv);
session_free_w_fifos (s);
}
void
session_cleanup_half_open (session_handle_t ho_handle)
{
session_t *ho = session_get_from_handle (ho_handle);
/* App transports can migrate their half-opens */
if (ho->flags & SESSION_F_IS_MIGRATING)
{
/* Session still migrating, move to closed state to signal that the
* session should be removed. */
if (ho->connection_index == ~0)
{
ho->session_state = SESSION_STATE_CLOSED;
return;
}
/* Migrated transports are no longer half-opens */
transport_cleanup (session_get_transport_proto (ho),
ho->connection_index, ho->app_index /* overloaded */);
}
else
transport_cleanup_half_open (session_get_transport_proto (ho),
ho->connection_index);
session_free (ho);
}
static void
session_half_open_free (session_t *ho)
{
app_worker_t *app_wrk;
ASSERT (vlib_get_thread_index () <= 1);
app_wrk = app_worker_get (ho->app_wrk_index);
app_worker_del_half_open (app_wrk, ho);
session_free (ho);
}
static void
session_half_open_free_rpc (void *args)
{
session_t *ho = ho_session_get (pointer_to_uword (args));
session_half_open_free (ho);
}
void
session_half_open_delete_notify (transport_connection_t *tc)
{
/* Notification from ctrl thread accepted without rpc */
if (!tc->thread_index)
{
session_half_open_free (ho_session_get (tc->s_index));
}
else
{
void *args = uword_to_pointer ((uword) tc->s_index, void *);
session_send_rpc_evt_to_thread_force (0, session_half_open_free_rpc,
args);
}
}
void
session_half_open_migrate_notify (transport_connection_t *tc)
{
session_t *ho;
ho = ho_session_get (tc->s_index);
ho->flags |= SESSION_F_IS_MIGRATING;
ho->connection_index = ~0;
}
int
session_half_open_migrated_notify (transport_connection_t *tc)
{
session_t *ho;
ho = ho_session_get (tc->s_index);
/* App probably detached so the half-open must be cleaned up */
if (ho->session_state == SESSION_STATE_CLOSED)
{
session_half_open_delete_notify (tc);
return -1;
}
ho->connection_index = tc->c_index;
/* Overload app index for half-open with new thread */
ho->app_index = tc->thread_index;
return 0;
}
session_t *
session_alloc_for_connection (transport_connection_t * tc)
{
session_t *s;
u32 thread_index = tc->thread_index;
ASSERT (thread_index == vlib_get_thread_index ()
|| transport_protocol_is_cl (tc->proto));
s = session_alloc (thread_index);
s->session_type = session_type_from_proto_and_ip (tc->proto, tc->is_ip4);
s->session_state = SESSION_STATE_CLOSED;
/* Attach transport to session and vice versa */
s->connection_index = tc->c_index;
tc->s_index = s->session_index;
return s;
}
session_t *
session_alloc_for_half_open (transport_connection_t *tc)
{
session_t *s;
s = ho_session_alloc ();
s->session_type = session_type_from_proto_and_ip (tc->proto, tc->is_ip4);
s->connection_index = tc->c_index;
tc->s_index = s->session_index;
return s;
}
/**
* Discards bytes from buffer chain
*
* It discards n_bytes_to_drop starting at first buffer after chain_b
*/
always_inline void
session_enqueue_discard_chain_bytes (vlib_main_t * vm, vlib_buffer_t * b,
vlib_buffer_t ** chain_b,
u32 n_bytes_to_drop)
{
vlib_buffer_t *next = *chain_b;
u32 to_drop = n_bytes_to_drop;
ASSERT (b->flags & VLIB_BUFFER_NEXT_PRESENT);
while (to_drop && (next->flags & VLIB_BUFFER_NEXT_PRESENT))
{
next = vlib_get_buffer (vm, next->next_buffer);
if (next->current_length > to_drop)
{
vlib_buffer_advance (next, to_drop);
to_drop = 0;
}
else
{
to_drop -= next->current_length;
next->current_length = 0;
}
}
*chain_b = next;
if (to_drop == 0)
b->total_length_not_including_first_buffer -= n_bytes_to_drop;
}
/**
* Enqueue buffer chain tail
*/
always_inline int
session_enqueue_chain_tail (session_t * s, vlib_buffer_t * b,
u32 offset, u8 is_in_order)
{
vlib_buffer_t *chain_b;
u32 chain_bi, len, diff;
vlib_main_t *vm = vlib_get_main ();
u8 *data;
u32 written = 0;
int rv = 0;
if (is_in_order && offset)
{
diff = offset - b->current_length;
if (diff > b->total_length_not_including_first_buffer)
return 0;
chain_b = b;
session_enqueue_discard_chain_bytes (vm, b, &chain_b, diff);
chain_bi = vlib_get_buffer_index (vm, chain_b);
}
else
chain_bi = b->next_buffer;
do
{
chain_b = vlib_get_buffer (vm, chain_bi);
data = vlib_buffer_get_current (chain_b);
len = chain_b->current_length;
if (!len)
continue;
if (is_in_order)
{
rv = svm_fifo_enqueue (s->rx_fifo, len, data);
if (rv == len)
{
written += rv;
}
else if (rv < len)
{
return (rv > 0) ? (written + rv) : written;
}
else if (rv > len)
{
written += rv;
/* written more than what was left in chain */
if (written > b->total_length_not_including_first_buffer)
return written;
/* drop the bytes that have already been delivered */
session_enqueue_discard_chain_bytes (vm, b, &chain_b, rv - len);
}
}
else
{
rv = svm_fifo_enqueue_with_offset (s->rx_fifo, offset, len, data);
if (rv)
{
clib_warning ("failed to enqueue multi-buffer seg");
return -1;
}
offset += len;
}
}
while ((chain_bi = (chain_b->flags & VLIB_BUFFER_NEXT_PRESENT)
? chain_b->next_buffer : 0));
if (is_in_order)
return written;
return 0;
}
void
session_fifo_tuning (session_t * s, svm_fifo_t * f,
session_ft_action_t act, u32 len)
{
if (s->flags & SESSION_F_CUSTOM_FIFO_TUNING)
{
app_worker_t *app_wrk = app_worker_get (s->app_wrk_index);
app_worker_session_fifo_tuning (app_wrk, s, f, act, len);
if (CLIB_ASSERT_ENABLE)
{
segment_manager_t *sm;
sm = segment_manager_get (f->segment_manager);
ASSERT (f->shr->size >= 4096);
ASSERT (f->shr->size <= sm->max_fifo_size);
}
}
}
/*
* Enqueue data for delivery to session peer. Does not notify peer of enqueue
* event but on request can queue notification events for later delivery by
* calling stream_server_flush_enqueue_events().
*
* @param tc Transport connection which is to be enqueued data
* @param b Buffer to be enqueued
* @param offset Offset at which to start enqueueing if out-of-order
* @param queue_event Flag to indicate if peer is to be notified or if event
* is to be queued. The former is useful when more data is
* enqueued and only one event is to be generated.
* @param is_in_order Flag to indicate if data is in order
* @return Number of bytes enqueued or a negative value if enqueueing failed.
*/
int
session_enqueue_stream_connection (transport_connection_t * tc,
vlib_buffer_t * b, u32 offset,
u8 queue_event, u8 is_in_order)
{
session_t *s;
int enqueued = 0, rv, in_order_off;
s = session_get (tc->s_index, tc->thread_index);
if (is_in_order)
{
enqueued = svm_fifo_enqueue (s->rx_fifo,
b->current_length,
vlib_buffer_get_current (b));
if (PREDICT_FALSE ((b->flags & VLIB_BUFFER_NEXT_PRESENT)
&& enqueued >= 0))
{
in_order_off = enqueued > b->current_length ? enqueued : 0;
rv = session_enqueue_chain_tail (s, b, in_order_off, 1);
if (rv > 0)
enqueued += rv;
}
}
else
{
rv = svm_fifo_enqueue_with_offset (s->rx_fifo, offset,
b->current_length,
vlib_buffer_get_current (b));
if (PREDICT_FALSE ((b->flags & VLIB_BUFFER_NEXT_PRESENT) && !rv))
session_enqueue_chain_tail (s, b, offset + b->current_length, 0);
/* if something was enqueued, report even this as success for ooo
* segment handling */
return rv;
}
if (queue_event)
{
/* Queue RX event on this fifo. Eventually these will need to be flushed
* by calling stream_server_flush_enqueue_events () */
session_worker_t *wrk;
wrk = session_main_get_worker (s->thread_index);
if (!(s->flags & SESSION_F_RX_EVT))
{
s->flags |= SESSION_F_RX_EVT;
vec_add1 (wrk->session_to_enqueue[tc->proto], s->session_index);
}
session_fifo_tuning (s, s->rx_fifo, SESSION_FT_ACTION_ENQUEUED, 0);
}
return enqueued;
}
int
session_enqueue_dgram_connection (session_t * s,
session_dgram_hdr_t * hdr,
vlib_buffer_t * b, u8 proto, u8 queue_event)
{
int rv;
ASSERT (svm_fifo_max_enqueue_prod (s->rx_fifo)
>= b->current_length + sizeof (*hdr));
if (PREDICT_TRUE (!(b->flags & VLIB_BUFFER_NEXT_PRESENT)))
{
/* *INDENT-OFF* */
svm_fifo_seg_t segs[2] = {
{ (u8 *) hdr, sizeof (*hdr) },
{ vlib_buffer_get_current (b), b->current_length }
};
/* *INDENT-ON* */
rv = svm_fifo_enqueue_segments (s->rx_fifo, segs, 2,
0 /* allow_partial */ );
}
else
{
vlib_main_t *vm = vlib_get_main ();
svm_fifo_seg_t *segs = 0, *seg;
vlib_buffer_t *it = b;
u32 n_segs = 1;
vec_add2 (segs, seg, 1);
seg->data = (u8 *) hdr;
seg->len = sizeof (*hdr);
while (it)
{
vec_add2 (segs, seg, 1);
seg->data = vlib_buffer_get_current (it);
seg->len = it->current_length;
n_segs++;
if (!(it->flags & VLIB_BUFFER_NEXT_PRESENT))
break;
it = vlib_get_buffer (vm, it->next_buffer);
}
rv = svm_fifo_enqueue_segments (s->rx_fifo, segs, n_segs,
0 /* allow partial */ );
vec_free (segs);
}
if (queue_event && rv > 0)
{
/* Queue RX event on this fifo. Eventually these will need to be flushed
* by calling stream_server_flush_enqueue_events () */
session_worker_t *wrk;
wrk = session_main_get_worker (s->thread_index);
if (!(s->flags & SESSION_F_RX_EVT))
{
s->flags |= SESSION_F_RX_EVT;
vec_add1 (wrk->session_to_enqueue[proto], s->session_index);
}
session_fifo_tuning (s, s->rx_fifo, SESSION_FT_ACTION_ENQUEUED, 0);
}
return rv > 0 ? rv : 0;
}
int
session_tx_fifo_peek_bytes (transport_connection_t * tc, u8 * buffer,
u32 offset, u32 max_bytes)
{
session_t *s = session_get (tc->s_index, tc->thread_index);
return svm_fifo_peek (s->tx_fifo, offset, max_bytes, buffer);
}
u32
session_tx_fifo_dequeue_drop (transport_connection_t * tc, u32 max_bytes)
{
session_t *s = session_get (tc->s_index, tc->thread_index);
u32 rv;
rv = svm_fifo_dequeue_drop (s->tx_fifo, max_bytes);
session_fifo_tuning (s, s->tx_fifo, SESSION_FT_ACTION_DEQUEUED, rv);
if (svm_fifo_needs_deq_ntf (s->tx_fifo, max_bytes))
session_dequeue_notify (s);
return rv;
}
static inline int
session_notify_subscribers (u32 app_index, session_t * s,
svm_fifo_t * f, session_evt_type_t evt_type)
{
app_worker_t *app_wrk;
application_t *app;
int i;
app = application_get (app_index);
if (!app)
return -1;
for (i = 0; i < f->shr->n_subscribers; i++)
{
app_wrk = application_get_worker (app, f->shr->subscribers[i]);
if (!app_wrk)
continue;
if (app_worker_lock_and_send_event (app_wrk, s, evt_type))
return -1;
}
return 0;
}
/**
* Notify session peer that new data has been enqueued.
*
* @param s Stream session for which the event is to be generated.
* @param lock Flag to indicate if call should lock message queue.
*
* @return 0 on success or negative number if failed to send notification.
*/
static inline int
session_enqueue_notify_inline (session_t * s)
{
app_worker_t *app_wrk;
u32 session_index;
u8 n_subscribers;
session_index = s->session_index;
n_subscribers = svm_fifo_n_subscribers (s->rx_fifo);
app_wrk = app_worker_get_if_valid (s->app_wrk_index);
if (PREDICT_FALSE (!app_wrk))
{
SESSION_DBG ("invalid s->app_index = %d", s->app_wrk_index);
return 0;
}
SESSION_EVT (SESSION_EVT_ENQ, s, svm_fifo_max_dequeue_prod (s->rx_fifo));
s->flags &= ~SESSION_F_RX_EVT;
/* Application didn't confirm accept yet */
if (PREDICT_FALSE (s->session_state == SESSION_STATE_ACCEPTING))
return 0;
if (PREDICT_FALSE (app_worker_lock_and_send_event (app_wrk, s,
SESSION_IO_EVT_RX)))
return -1;
if (PREDICT_FALSE (n_subscribers))
{
s = session_get (session_index, vlib_get_thread_index ());
return session_notify_subscribers (app_wrk->app_index, s,
s->rx_fifo, SESSION_IO_EVT_RX);
}
return 0;
}
int
session_enqueue_notify (session_t * s)
{
return session_enqueue_notify_inline (s);
}
static void
session_enqueue_notify_rpc (void *arg)
{
u32 session_index = pointer_to_uword (arg);
session_t *s;
s = session_get_if_valid (session_index, vlib_get_thread_index ());
if (!s)
return;
session_enqueue_notify (s);
}
/**
* Like session_enqueue_notify, but can be called from a thread that does not
* own the session.
*/
void
session_enqueue_notify_thread (session_handle_t sh)
{
u32 thread_index = session_thread_from_handle (sh);
u32 session_index = session_index_from_handle (sh);
/*
* Pass session index (u32) as opposed to handle (u64) in case pointers
* are not 64-bit.
*/
session_send_rpc_evt_to_thread (thread_index,
session_enqueue_notify_rpc,
uword_to_pointer (session_index, void *));
}
int
session_dequeue_notify (session_t * s)
{
app_worker_t *app_wrk;
svm_fifo_clear_deq_ntf (s->tx_fifo);
app_wrk = app_worker_get_if_valid (s->app_wrk_index);
if (PREDICT_FALSE (!app_wrk))
return -1;
if (PREDICT_FALSE (app_worker_lock_and_send_event (app_wrk, s,
SESSION_IO_EVT_TX)))
return -1;
if (PREDICT_FALSE (s->tx_fifo->shr->n_subscribers))
return session_notify_subscribers (app_wrk->app_index, s,
s->tx_fifo, SESSION_IO_EVT_TX);
return 0;
}
/**
* Flushes queue of sessions that are to be notified of new data
* enqueued events.
*
* @param thread_index Thread index for which the flush is to be performed.
* @return 0 on success or a positive number indicating the number of
* failures due to API queue being full.
*/
int
session_main_flush_enqueue_events (u8 transport_proto, u32 thread_index)
{
session_worker_t *wrk = session_main_get_worker (thread_index);
session_t *s;
int i, errors = 0;
u32 *indices;
indices = wrk->session_to_enqueue[transport_proto];
for (i = 0; i < vec_len (indices); i++)
{
s = session_get_if_valid (indices[i], thread_index);
if (PREDICT_FALSE (!s))
{
errors++;
continue;
}
session_fifo_tuning (s, s->rx_fifo, SESSION_FT_ACTION_ENQUEUED,
0 /* TODO/not needed */ );
if (PREDICT_FALSE (session_enqueue_notify_inline (s)))
errors++;
}
vec_reset_length (indices);
wrk->session_to_enqueue[transport_proto] = indices;
return errors;
}
int
session_main_flush_all_enqueue_events (u8 transport_proto)
{
vlib_thread_main_t *vtm = vlib_get_thread_main ();
int i, errors = 0;
for (i = 0; i < 1 + vtm->n_threads; i++)
errors += session_main_flush_enqueue_events (transport_proto, i);
return errors;
}
int
session_stream_connect_notify (transport_connection_t * tc,
session_error_t err)
{
u32 opaque = 0, new_ti, new_si;
app_worker_t *app_wrk;
session_t *s = 0, *ho;
/*
* Cleanup half-open table
*/
session_lookup_del_half_open (tc);
ho = ho_session_get (tc->s_index);
opaque = ho->opaque;
app_wrk = app_worker_get_if_valid (ho->app_wrk_index);
if (!app_wrk)
return -1;
if (err)
return app_worker_connect_notify (app_wrk, s, err, opaque);
s = session_alloc_for_connection (tc);
s->session_state = SESSION_STATE_CONNECTING;
s->app_wrk_index = app_wrk->wrk_index;
new_si = s->session_index;
new_ti = s->thread_index;
if ((err = app_worker_init_connected (app_wrk, s)))
{
session_free (s);
app_worker_connect_notify (app_wrk, 0, err, opaque);
return -1;
}
s = session_get (new_si, new_ti);
s->session_state = SESSION_STATE_READY;
session_lookup_add_connection (tc, session_handle (s));
if (app_worker_connect_notify (app_wrk, s, SESSION_E_NONE, opaque))
{
session_lookup_del_connection (tc);
/* Avoid notifying app about rejected session cleanup */
s = session_get (new_si, new_ti);
segment_manager_dealloc_fifos (s->rx_fifo, s->tx_fifo);
session_free (s);
return -1;
}
return 0;
}
typedef union session_switch_pool_reply_args_
{
struct
{
u32 session_index;
u16 thread_index;
u8 is_closed;
};
u64 as_u64;
} session_switch_pool_reply_args_t;
STATIC_ASSERT (sizeof (session_switch_pool_reply_args_t) <= sizeof (uword),
"switch pool reply args size");
static void
session_switch_pool_reply (void *arg)
{
session_switch_pool_reply_args_t rargs;
session_t *s;
rargs.as_u64 = pointer_to_uword (arg);
s = session_get_if_valid (rargs.session_index, rargs.thread_index);
if (!s)
return;
/* Session closed during migration. Clean everything up */
if (rargs.is_closed)
{
transport_cleanup (session_get_transport_proto (s), s->connection_index,
s->thread_index);
segment_manager_dealloc_fifos (s->rx_fifo, s->tx_fifo);
session_free (s);
return;
}
/* Notify app that it has data on the new session */
session_enqueue_notify (s);
}
typedef struct _session_switch_pool_args
{
u32 session_index;
u32 thread_index;
u32 new_thread_index;
u32 new_session_index;
} session_switch_pool_args_t;
/**
* Notify old thread of the session pool switch
*/
static void
session_switch_pool (void *cb_args)
{
session_switch_pool_args_t *args = (session_switch_pool_args_t *) cb_args;
session_switch_pool_reply_args_t rargs;
session_handle_t new_sh;
segment_manager_t *sm;
app_worker_t *app_wrk;
session_t *s;
ASSERT (args->thread_index == vlib_get_thread_index ());
s = session_get (args->session_index, args->thread_index);
/* Check if session closed during migration */
rargs.is_closed = s->session_state >= SESSION_STATE_TRANSPORT_CLOSING;
transport_cleanup (session_get_transport_proto (s), s->connection_index,
s->thread_index);
app_wrk = app_worker_get_if_valid (s->app_wrk_index);
if (app_wrk)
{
/* Cleanup fifo segment slice state for fifos */
sm = app_worker_get_connect_segment_manager (app_wrk);
segment_manager_detach_fifo (sm, &s->rx_fifo);
segment_manager_detach_fifo (sm, &s->tx_fifo);
/* Notify app, using old session, about the migration event */
if (!rargs.is_closed)
{
new_sh = session_make_handle (args->new_session_index,
args->new_thread_index);
app_worker_migrate_notify (app_wrk, s, new_sh);
}
}
/* Trigger app read and fifo updates on the new thread */
rargs.session_index = args->new_session_index;
rargs.thread_index = args->new_thread_index;
session_send_rpc_evt_to_thread (args->new_thread_index,
session_switch_pool_reply,
uword_to_pointer (rargs.as_u64, void *));
session_free (s);
clib_mem_free (cb_args);
}
/**
* Move dgram session to the right thread
*/
int
session_dgram_connect_notify (transport_connection_t * tc,
u32 old_thread_index, session_t ** new_session)
{
session_t *new_s;
session_switch_pool_args_t *rpc_args;
segment_manager_t *sm;
app_worker_t *app_wrk;
/*
* Clone half-open session to the right thread.
*/
new_s = session_clone_safe (tc->s_index, old_thread_index);
new_s->connection_index = tc->c_index;
new_s->session_state = SESSION_STATE_READY;
new_s->flags |= SESSION_F_IS_MIGRATING;
if (!(tc->flags & TRANSPORT_CONNECTION_F_NO_LOOKUP))
session_lookup_add_connection (tc, session_handle (new_s));
app_wrk = app_worker_get_if_valid (new_s->app_wrk_index);
if (app_wrk)
{
/* New set of fifos attached to the same shared memory */
sm = app_worker_get_connect_segment_manager (app_wrk);
segment_manager_attach_fifo (sm, &new_s->rx_fifo, new_s);
segment_manager_attach_fifo (sm, &new_s->tx_fifo, new_s);
}
/*
* Ask thread owning the old session to clean it up and make us the tx
* fifo owner
*/
rpc_args = clib_mem_alloc (sizeof (*rpc_args));
rpc_args->new_session_index = new_s->session_index;
rpc_args->new_thread_index = new_s->thread_index;
rpc_args->session_index = tc->s_index;
rpc_args->thread_index = old_thread_index;
session_send_rpc_evt_to_thread (rpc_args->thread_index, session_switch_pool,
rpc_args);
tc->s_index = new_s->session_index;
new_s->connection_index = tc->c_index;
*new_session = new_s;
return 0;
}
/**
* Notification from transport that connection is being closed.
*
* A disconnect is sent to application but state is not removed. Once
* disconnect is acknowledged by application, session disconnect is called.
* Ultimately this leads to close being called on transport (passive close).
*/
void
session_transport_closing_notify (transport_connection_t * tc)
{
app_worker_t *app_wrk;
session_t *s;
s = session_get (tc->s_index, tc->thread_index);
if (s->session_state >= SESSION_STATE_TRANSPORT_CLOSING)
return;
/* Wait for reply from app before sending notification as the
* accept might be rejected */
if (s->session_state == SESSION_STATE_ACCEPTING)
{
s->session_state = SESSION_STATE_TRANSPORT_CLOSING;
return;
}
s->session_state = SESSION_STATE_TRANSPORT_CLOSING;
app_wrk = app_worker_get (s->app_wrk_index);
app_worker_close_notify (app_wrk, s);
}
/**
* Notification from transport that connection is being deleted
*
* This removes the session if it is still valid. It should be called only on
* previously fully established sessions. For instance failed connects should
* call stream_session_connect_notify and indicate that the connect has
* failed.
*/
void
session_transport_delete_notify (transport_connection_t * tc)
{
session_t *s;
/* App might've been removed already */
if (!(s = session_get_if_valid (tc->s_index, tc->thread_index)))
return;
switch (s->session_state)
{
case SESSION_STATE_CREATED:
/* Session was created but accept notification was not yet sent to the
* app. Cleanup everything. */
session_lookup_del_session (s);
segment_manager_dealloc_fifos (s->rx_fifo, s->tx_fifo);
session_free (s);
break;
case SESSION_STATE_ACCEPTING:
case SESSION_STATE_TRANSPORT_CLOSING:
case SESSION_STATE_CLOSING:
case SESSION_STATE_TRANSPORT_CLOSED:
/* If transport finishes or times out before we get a reply
* from the app, mark transport as closed and wait for reply
* before removing the session. Cleanup session table in advance
* because transport will soon be closed and closed sessions
* are assumed to have been removed from the lookup table */
session_lookup_del_session (s);
s->session_state = SESSION_STATE_TRANSPORT_DELETED;
session_cleanup_notify (s, SESSION_CLEANUP_TRANSPORT);
svm_fifo_dequeue_drop_all (s->tx_fifo);
break;
case SESSION_STATE_APP_CLOSED:
/* Cleanup lookup table as transport needs to still be valid.
* Program transport close to ensure that all session events
* have been cleaned up. Once transport close is called, the
* session is just removed because both transport and app have
* confirmed the close*/
session_lookup_del_session (s);
s->session_state = SESSION_STATE_TRANSPORT_DELETED;
session_cleanup_notify (s, SESSION_CLEANUP_TRANSPORT);
svm_fifo_dequeue_drop_all (s->tx_fifo);
session_program_transport_ctrl_evt (s, SESSION_CTRL_EVT_CLOSE);
break;
case SESSION_STATE_TRANSPORT_DELETED:
break;
case SESSION_STATE_CLOSED:
session_cleanup_notify (s, SESSION_CLEANUP_TRANSPORT);
session_delete (s);
break;
default:
clib_warning ("session state %u", s->session_state);
session_cleanup_notify (s, SESSION_CLEANUP_TRANSPORT);
session_delete (s);
break;
}
}
/**
* Notification from transport that it is closed
*
* Should be called by transport, prior to calling delete notify, once it
* knows that no more data will be exchanged. This could serve as an
* early acknowledgment of an active close especially if transport delete
* can be delayed a long time, e.g., tcp time-wait.
*/
void
session_transport_closed_notify (transport_connection_t * tc)
{
app_worker_t *app_wrk;
session_t *s;
if (!(s = session_get_if_valid (tc->s_index, tc->thread_index)))
return;
/* Transport thinks that app requested close but it actually didn't.
* Can happen for tcp:
* 1)if fin and rst are received in close succession.
* 2)if app shutdown the connection. */
if (s->session_state == SESSION_STATE_READY)
{
session_transport_closing_notify (tc);
svm_fifo_dequeue_drop_all (s->tx_fifo);
s->session_state = SESSION_STATE_TRANSPORT_CLOSED;
}
/* If app close has not been received or has not yet resulted in
* a transport close, only mark the session transport as closed */
else if (s->session_state <= SESSION_STATE_CLOSING)
{
s->session_state = SESSION_STATE_TRANSPORT_CLOSED;
}
/* If app also closed, switch to closed */
else if (s->session_state == SESSION_STATE_APP_CLOSED)
s->session_state = SESSION_STATE_CLOSED;
app_wrk = app_worker_get_if_valid (s->app_wrk_index);
if (app_wrk)
app_worker_transport_closed_notify (app_wrk, s);
}
/**
* Notify application that connection has been reset.
*/
void
session_transport_reset_notify (transport_connection_t * tc)
{
app_worker_t *app_wrk;
session_t *s;
s = session_get (tc->s_index, tc->thread_index);
svm_fifo_dequeue_drop_all (s->tx_fifo);
if (s->session_state >= SESSION_STATE_TRANSPORT_CLOSING)
return;
if (s->session_state == SESSION_STATE_ACCEPTING)
{
s->session_state = SESSION_STATE_TRANSPORT_CLOSING;
return;
}
s->session_state = SESSION_STATE_TRANSPORT_CLOSING;
app_wrk = app_worker_get (s->app_wrk_index);
app_worker_reset_notify (app_wrk, s);
}
int
session_stream_accept_notify (transport_connection_t * tc)
{
app_worker_t *app_wrk;
session_t *s;
s = session_get (tc->s_index, tc->thread_index);
app_wrk = app_worker_get_if_valid (s->app_wrk_index);
if (!app_wrk)
return -1;
if (s->session_state != SESSION_STATE_CREATED)
return 0;
s->session_state = SESSION_STATE_ACCEPTING;
if (app_worker_accept_notify (app_wrk, s))
{
/* On transport delete, no notifications should be sent. Unless, the
* accept is retried and successful. */
s->session_state = SESSION_STATE_CREATED;
return -1;
}
return 0;
}
/**
* Accept a stream session. Optionally ping the server by callback.
*/
int
session_stream_accept (transport_connection_t * tc, u32 listener_index,
u32 thread_index, u8 notify)
{
session_t *s;
int rv;
s = session_alloc_for_connection (tc);
s->listener_handle = ((u64) thread_index << 32) | (u64) listener_index;
s->session_state = SESSION_STATE_CREATED;
if ((rv = app_worker_init_accepted (s)))
{
session_free (s);
return rv;
}
session_lookup_add_connection (tc, session_handle (s));
/* Shoulder-tap the server */
if (notify)
{
app_worker_t *app_wrk = app_worker_get (s->app_wrk_index);
if ((rv = app_worker_accept_notify (app_wrk, s)))
{
session_lookup_del_session (s);
segment_manager_dealloc_fifos (s->rx_fifo, s->tx_fifo);
session_free (s);
return rv;
}
}
return 0;
}
int
session_dgram_accept (transport_connection_t * tc, u32 listener_index,
u32 thread_index)
{
app_worker_t *app_wrk;
session_t *s;
int rv;
s = session_alloc_for_connection (tc);
s->listener_handle = ((u64) thread_index << 32) | (u64) listener_index;
if ((rv = app_worker_init_accepted (s)))
{
session_free (s);
return rv;
}
session_lookup_add_connection (tc, session_handle (s));
app_wrk = app_worker_get (s->app_wrk_index);
if ((rv = app_worker_accept_notify (app_wrk, s)))
{
session_lookup_del_session (s);
segment_manager_dealloc_fifos (s->rx_fifo, s->tx_fifo);
session_free (s);
return rv;
}
return 0;
}
int
session_open_cl (session_endpoint_cfg_t *rmt, session_handle_t *rsh)
{
transport_connection_t *tc;
transport_endpoint_cfg_t *tep;
app_worker_t *app_wrk;
session_handle_t sh;
session_t *s;
int rv;
tep = session_endpoint_to_transport_cfg (rmt);
rv = transport_connect (rmt->transport_proto, tep);
if (rv < 0)
{
SESSION_DBG ("Transport failed to open connection.");
return rv;
}
tc = transport_get_half_open (rmt->transport_proto, (u32) rv);
/* For dgram type of service, allocate session and fifos now */
app_wrk = app_worker_get (rmt->app_wrk_index);
s = session_alloc_for_connection (tc);
s->app_wrk_index = app_wrk->wrk_index;
s->session_state = SESSION_STATE_OPENED;
if (app_worker_init_connected (app_wrk, s))
{
session_free (s);
return -1;
}
sh = session_handle (s);
*rsh = sh;
session_lookup_add_connection (tc, sh);
return app_worker_connect_notify (app_wrk, s, SESSION_E_NONE, rmt->opaque);
}
int
session_open_vc (session_endpoint_cfg_t *rmt, session_handle_t *rsh)
{
transport_connection_t *tc;
transport_endpoint_cfg_t *tep;
app_worker_t *app_wrk;
session_t *ho;
int rv;
tep = session_endpoint_to_transport_cfg (rmt);
rv = transport_connect (rmt->transport_proto, tep);
if (rv < 0)
{
SESSION_DBG ("Transport failed to open connection.");
return rv;
}
tc = transport_get_half_open (rmt->transport_proto, (u32) rv);
app_wrk = app_worker_get (rmt->app_wrk_index);
/* If transport offers a vc service, only allocate established
* session once the connection has been established.
* In the meantime allocate half-open session for tracking purposes
* associate half-open connection to it and add session to app-worker
* half-open table. These are needed to allocate the established
* session on transport notification, and to cleanup the half-open
* session if the app detaches before connection establishment.
*/
ho = session_alloc_for_half_open (tc);
ho->app_wrk_index = app_wrk->wrk_index;
ho->ho_index = app_worker_add_half_open (app_wrk, session_handle (ho));
ho->opaque = rmt->opaque;
*rsh = session_handle (ho);
if (!(tc->flags & TRANSPORT_CONNECTION_F_NO_LOOKUP))
session_lookup_add_half_open (tc, tc->c_index);
return 0;
}
int
session_open_app (session_endpoint_cfg_t *rmt, session_handle_t *rsh)
{
transport_endpoint_cfg_t *tep_cfg = session_endpoint_to_transport_cfg (rmt);
/* Not supported for now */
*rsh = SESSION_INVALID_HANDLE;
return transport_connect (rmt->transport_proto, tep_cfg);
}
typedef int (*session_open_service_fn) (session_endpoint_cfg_t *,
session_handle_t *);
/* *INDENT-OFF* */
static session_open_service_fn session_open_srv_fns[TRANSPORT_N_SERVICES] = {
session_open_vc,
session_open_cl,
session_open_app,
};
/* *INDENT-ON* */
/**
* Ask transport to open connection to remote transport endpoint.
*
* Stores handle for matching request with reply since the call can be
* asynchronous. For instance, for TCP the 3-way handshake must complete
* before reply comes. Session is only created once connection is established.
*
* @param app_index Index of the application requesting the connect
* @param st Session type requested.
* @param tep Remote transport endpoint
* @param opaque Opaque data (typically, api_context) the application expects
* on open completion.
*/
int
session_open (session_endpoint_cfg_t *rmt, session_handle_t *rsh)
{
transport_service_type_t tst;
tst = transport_protocol_service_type (rmt->transport_proto);
return session_open_srv_fns[tst](rmt, rsh);
}
/**
* Ask transport to listen on session endpoint.
*
* @param s Session for which listen will be called. Note that unlike
* established sessions, listen sessions are not associated to a
* thread.
* @param sep Local endpoint to be listened on.
*/
int
session_listen (session_t * ls, session_endpoint_cfg_t * sep)
{
transport_endpoint_cfg_t *tep;
int tc_index;
u32 s_index;
/* Transport bind/listen */
tep = session_endpoint_to_transport_cfg (sep);
s_index = ls->session_index;
tc_index = transport_start_listen (session_get_transport_proto (ls),
s_index, tep);
if (tc_index < 0)
return tc_index;
/* Attach transport to session. Lookup tables are populated by the app
* worker because local tables (for ct sessions) are not backed by a fib */
ls = listen_session_get (s_index);
ls->connection_index = tc_index;
return 0;
}
/**
* Ask transport to stop listening on local transport endpoint.
*
* @param s Session to stop listening on. It must be in state LISTENING.
*/
int
session_stop_listen (session_t * s)
{
transport_proto_t tp = session_get_transport_proto (s);
transport_connection_t *tc;
if (s->session_state != SESSION_STATE_LISTENING)
return SESSION_E_NOLISTEN;
tc = transport_get_listener (tp, s->connection_index);
/* If no transport, assume everything was cleaned up already */
if (!tc)
return SESSION_E_NONE;
if (!(tc->flags & TRANSPORT_CONNECTION_F_NO_LOOKUP))
session_lookup_del_connection (tc);
transport_stop_listen (tp, s->connection_index);
return 0;
}
/**
* Initialize session half-closing procedure.
*
* Note that half-closing will not change the state of the session.
*/
void
session_half_close (session_t *s)
{
if (!s)
return;
session_program_transport_ctrl_evt (s, SESSION_CTRL_EVT_HALF_CLOSE);
}
/**
* Initialize session closing procedure.
*
* Request is always sent to session node to ensure that all outstanding
* requests are served before transport is notified.
*/
void
session_close (session_t * s)
{
if (!s)
return;
if (s->session_state >= SESSION_STATE_CLOSING)
{
/* Session will only be removed once both app and transport
* acknowledge the close */
if (s->session_state == SESSION_STATE_TRANSPORT_CLOSED
|| s->session_state == SESSION_STATE_TRANSPORT_DELETED)
session_program_transport_ctrl_evt (s, SESSION_CTRL_EVT_CLOSE);
return;
}
/* App closed so stop propagating dequeue notifications */
svm_fifo_clear_deq_ntf (s->tx_fifo);
s->session_state = SESSION_STATE_CLOSING;
session_program_transport_ctrl_evt (s, SESSION_CTRL_EVT_CLOSE);
}
/**
* Force a close without waiting for data to be flushed
*/
void
session_reset (session_t * s)
{
if (s->session_state >= SESSION_STATE_CLOSING)
return;
/* Drop all outstanding tx data */
svm_fifo_dequeue_drop_all (s->tx_fifo);
s->session_state = SESSION_STATE_CLOSING;
session_program_transport_ctrl_evt (s, SESSION_CTRL_EVT_RESET);
}
/**
* Notify transport the session can be half-disconnected.
*
* Must be called from the session's thread.
*/
void
session_transport_half_close (session_t *s)
{
/* Only READY session can be half-closed */
if (s->session_state != SESSION_STATE_READY)
{
return;
}
transport_half_close (session_get_transport_proto (s), s->connection_index,
s->thread_index);
}
/**
* Notify transport the session can be disconnected. This should eventually
* result in a delete notification that allows us to cleanup session state.
* Called for both active/passive disconnects.
*
* Must be called from the session's thread.
*/
void
session_transport_close (session_t * s)
{
if (s->session_state >= SESSION_STATE_APP_CLOSED)
{
if (s->session_state == SESSION_STATE_TRANSPORT_CLOSED)
s->session_state = SESSION_STATE_CLOSED;
/* If transport is already deleted, just free the session */
else if (s->session_state >= SESSION_STATE_TRANSPORT_DELETED)
session_free_w_fifos (s);
return;
}
/* If the tx queue wasn't drained, the transport can continue to try
* sending the outstanding data (in closed state it cannot). It MUST however
* at one point, either after sending everything or after a timeout, call
* delete notify. This will finally lead to the complete cleanup of the
* session.
*/
s->session_state = SESSION_STATE_APP_CLOSED;
transport_close (session_get_transport_proto (s), s->connection_index,
s->thread_index);
}
/**
* Force transport close
*/
void
session_transport_reset (session_t * s)
{
if (s->session_state >= SESSION_STATE_APP_CLOSED)
{
if (s->session_state == SESSION_STATE_TRANSPORT_CLOSED)
s->session_state = SESSION_STATE_CLOSED;
else if (s->session_state >= SESSION_STATE_TRANSPORT_DELETED)
session_free_w_fifos (s);
return;
}
s->session_state = SESSION_STATE_APP_CLOSED;
transport_reset (session_get_transport_proto (s), s->connection_index,
s->thread_index);
}
/**
* Cleanup transport and session state.
*
* Notify transport of the cleanup and free the session. This should
* be called only if transport reported some error and is already
* closed.
*/
void
session_transport_cleanup (session_t * s)
{
/* Delete from main lookup table before we axe the the transport */
session_lookup_del_session (s);
if (s->session_state != SESSION_STATE_TRANSPORT_DELETED)
transport_cleanup (session_get_transport_proto (s), s->connection_index,
s->thread_index);
/* Since we called cleanup, no delete notification will come. So, make
* sure the session is properly freed. */
segment_manager_dealloc_fifos (s->rx_fifo, s->tx_fifo);
session_free (s);
}
/**
* Allocate worker mqs in share-able segment
*
* That can only be a newly created memfd segment, that must be mapped
* by all apps/stack users unless private rx mqs are enabled.
*/
void
session_vpp_wrk_mqs_alloc (session_main_t *smm)
{
u32 mq_q_length = 2048, evt_size = sizeof (session_event_t);
fifo_segment_t *mqs_seg = &smm->wrk_mqs_segment;
svm_msg_q_cfg_t _cfg, *cfg = &_cfg;
uword mqs_seg_size;
int i;
mq_q_length = clib_max (mq_q_length, smm->configured_wrk_mq_length);
svm_msg_q_ring_cfg_t rc[SESSION_MQ_N_RINGS] = {
{ mq_q_length, evt_size, 0 }, { mq_q_length >> 1, 256, 0 }
};
cfg->consumer_pid = 0;
cfg->n_rings = 2;
cfg->q_nitems = mq_q_length;
cfg->ring_cfgs = rc;
/*
* Compute mqs segment size based on rings config and leave space
* for passing extended configuration messages, i.e., data allocated
* outside of the rings. If provided with a config value, accept it
* if larger than minimum size.
*/
mqs_seg_size = svm_msg_q_size_to_alloc (cfg) * vec_len (smm->wrk);
mqs_seg_size = mqs_seg_size + (32 << 10);
mqs_seg_size = clib_max (mqs_seg_size, smm->wrk_mqs_segment_size);
mqs_seg->ssvm.ssvm_size = mqs_seg_size;
mqs_seg->ssvm.my_pid = getpid ();
mqs_seg->ssvm.name = format (0, "%s%c", "session: wrk-mqs-segment", 0);
if (ssvm_server_init (&mqs_seg->ssvm, SSVM_SEGMENT_MEMFD))
{
clib_warning ("failed to initialize queue segment");
return;
}
fifo_segment_init (mqs_seg);
/* Special fifo segment that's filled only with mqs */
mqs_seg->h->n_mqs = vec_len (smm->wrk);
for (i = 0; i < vec_len (smm->wrk); i++)
smm->wrk[i].vpp_event_queue = fifo_segment_msg_q_alloc (mqs_seg, i, cfg);
}
fifo_segment_t *
session_main_get_wrk_mqs_segment (void)
{
return &session_main.wrk_mqs_segment;
}
u64
session_segment_handle (session_t * s)
{
svm_fifo_t *f;
if (!s->rx_fifo)
return SESSION_INVALID_HANDLE;
f = s->rx_fifo;
return segment_manager_make_segment_handle (f->segment_manager,
f->segment_index);
}
/* *INDENT-OFF* */
static session_fifo_rx_fn *session_tx_fns[TRANSPORT_TX_N_FNS] = {
session_tx_fifo_peek_and_snd,
session_tx_fifo_dequeue_and_snd,
session_tx_fifo_dequeue_internal,
session_tx_fifo_dequeue_and_snd
};
/* *INDENT-ON* */
void
session_register_transport (transport_proto_t transport_proto,
const transport_proto_vft_t * vft, u8 is_ip4,
u32 output_node)
{
session_main_t *smm = &session_main;
session_type_t session_type;
u32 next_index = ~0;
session_type = session_type_from_proto_and_ip (transport_proto, is_ip4);
vec_validate (smm->session_type_to_next, session_type);
vec_validate (smm->session_tx_fns, session_type);
if (output_node != ~0)
next_index = vlib_node_add_next (vlib_get_main (),
session_queue_node.index, output_node);
smm->session_type_to_next[session_type] = next_index;
smm->session_tx_fns[session_type] =
session_tx_fns[vft->transport_options.tx_type];
}
void
session_register_update_time_fn (session_update_time_fn fn, u8 is_add)
{
session_main_t *smm = &session_main;
session_update_time_fn *fi;
u32 fi_pos = ~0;
u8 found = 0;
vec_foreach (fi, smm->update_time_fns)
{
if (*fi == fn)
{
fi_pos = fi - smm->update_time_fns;
found = 1;
break;
}
}
if (is_add)
{
if (found)
{
clib_warning ("update time fn %p already registered", fn);
return;
}
vec_add1 (smm->update_time_fns, fn);
}
else
{
vec_del1 (smm->update_time_fns, fi_pos);
}
}
transport_proto_t
session_add_transport_proto (void)
{
session_main_t *smm = &session_main;
session_worker_t *wrk;
u32 thread;
smm->last_transport_proto_type += 1;
for (thread = 0; thread < vec_len (smm->wrk); thread++)
{
wrk = session_main_get_worker (thread);
vec_validate (wrk->session_to_enqueue, smm->last_transport_proto_type);
}
return smm->last_transport_proto_type;
}
transport_connection_t *
session_get_transport (session_t * s)
{
if (s->session_state != SESSION_STATE_LISTENING)
return transport_get_connection (session_get_transport_proto (s),
s->connection_index, s->thread_index);
else
return transport_get_listener (session_get_transport_proto (s),
s->connection_index);
}
void
session_get_endpoint (session_t * s, transport_endpoint_t * tep, u8 is_lcl)
{
if (s->session_state != SESSION_STATE_LISTENING)
return transport_get_endpoint (session_get_transport_proto (s),
s->connection_index, s->thread_index, tep,
is_lcl);
else
return transport_get_listener_endpoint (session_get_transport_proto (s),
s->connection_index, tep, is_lcl);
}
int
session_transport_attribute (session_t *s, u8 is_get,
transport_endpt_attr_t *attr)
{
if (s->session_state < SESSION_STATE_READY)
return -1;
return transport_connection_attribute (session_get_transport_proto (s),
s->connection_index, s->thread_index,
is_get, attr);
}
transport_connection_t *
listen_session_get_transport (session_t * s)
{
return transport_get_listener (session_get_transport_proto (s),
s->connection_index);
}
void
session_queue_run_on_main_thread (vlib_main_t * vm)
{
ASSERT (vlib_get_thread_index () == 0);
vlib_node_set_interrupt_pending (vm, session_queue_node.index);
}
static clib_error_t *
session_manager_main_enable (vlib_main_t * vm)
{
session_main_t *smm = &session_main;
vlib_thread_main_t *vtm = vlib_get_thread_main ();
u32 num_threads, preallocated_sessions_per_worker;
session_worker_t *wrk;
int i;
/* We only initialize once and do not de-initialized on disable */
if (smm->is_initialized)
goto done;
num_threads = 1 /* main thread */ + vtm->n_threads;
if (num_threads < 1)
return clib_error_return (0, "n_thread_stacks not set");
/* Allocate cache line aligned worker contexts */
vec_validate_aligned (smm->wrk, num_threads - 1, CLIB_CACHE_LINE_BYTES);
for (i = 0; i < num_threads; i++)
{
wrk = &smm->wrk[i];
wrk->ctrl_head = clib_llist_make_head (wrk->event_elts, evt_list);
wrk->new_head = clib_llist_make_head (wrk->event_elts, evt_list);
wrk->old_head = clib_llist_make_head (wrk->event_elts, evt_list);
wrk->pending_connects = clib_llist_make_head (wrk->event_elts, evt_list);
wrk->vm = vlib_get_main_by_index (i);
wrk->last_vlib_time = vlib_time_now (vm);
wrk->last_vlib_us_time = wrk->last_vlib_time * CLIB_US_TIME_FREQ;
wrk->timerfd = -1;
vec_validate (wrk->session_to_enqueue, smm->last_transport_proto_type);
if (num_threads > 1)
clib_rwlock_init (&smm->wrk[i].peekers_rw_locks);
if (!smm->no_adaptive && smm->use_private_rx_mqs)
session_wrk_enable_adaptive_mode (wrk);
}
/* Allocate vpp event queues segment and queue */
session_vpp_wrk_mqs_alloc (smm);
/* Initialize segment manager properties */
segment_manager_main_init ();
/* Preallocate sessions */
if (smm->preallocated_sessions)
{
if (num_threads == 1)
{
pool_init_fixed (smm->wrk[0].sessions, smm->preallocated_sessions);
}
else
{
int j;
preallocated_sessions_per_worker =
(1.1 * (f64) smm->preallocated_sessions /
(f64) (num_threads - 1));
for (j = 1; j < num_threads; j++)
{
pool_init_fixed (smm->wrk[j].sessions,
preallocated_sessions_per_worker);
}
}
}
session_lookup_init ();
app_namespaces_init ();
transport_init ();
smm->is_initialized = 1;
done:
smm->is_enabled = 1;
/* Enable transports */
transport_enable_disable (vm, 1);
session_debug_init ();
return 0;
}
static void
session_manager_main_disable (vlib_main_t * vm)
{
transport_enable_disable (vm, 0 /* is_en */ );
}
void
session_node_enable_disable (u8 is_en)
{
u8 mstate = is_en ? VLIB_NODE_STATE_INTERRUPT : VLIB_NODE_STATE_DISABLED;
u8 state = is_en ? VLIB_NODE_STATE_POLLING : VLIB_NODE_STATE_DISABLED;
session_main_t *sm = &session_main;
vlib_main_t *vm;
vlib_node_t *n;
int n_vlibs, i;
n_vlibs = vlib_get_n_threads ();
for (i = 0; i < n_vlibs; i++)
{
vm = vlib_get_main_by_index (i);
/* main thread with workers and not polling */
if (i == 0 && n_vlibs > 1)
{
vlib_node_set_state (vm, session_queue_node.index, mstate);
if (is_en)
{
session_main_get_worker (0)->state = SESSION_WRK_INTERRUPT;
vlib_node_set_state (vm, session_queue_process_node.index,
state);
n = vlib_get_node (vm, session_queue_process_node.index);
vlib_start_process (vm, n->runtime_index);
}
else
{
vlib_process_signal_event_mt (vm,
session_queue_process_node.index,
SESSION_Q_PROCESS_STOP, 0);
}
if (!sm->poll_main)
continue;
}
vlib_node_set_state (vm, session_queue_node.index, state);
}
if (sm->use_private_rx_mqs)
application_enable_rx_mqs_nodes (is_en);
}
clib_error_t *
vnet_session_enable_disable (vlib_main_t * vm, u8 is_en)
{
clib_error_t *error = 0;
if (is_en)
{
if (session_main.is_enabled)
return 0;
error = session_manager_main_enable (vm);
session_node_enable_disable (is_en);
}
else
{
session_main.is_enabled = 0;
session_manager_main_disable (vm);
session_node_enable_disable (is_en);
}
return error;
}
clib_error_t *
session_main_init (vlib_main_t * vm)
{
session_main_t *smm = &session_main;
smm->is_enabled = 0;
smm->session_enable_asap = 0;
smm->poll_main = 0;
smm->use_private_rx_mqs = 0;
smm->no_adaptive = 0;
smm->last_transport_proto_type = TRANSPORT_PROTO_HTTP;
return 0;
}
static clib_error_t *
session_main_loop_init (vlib_main_t * vm)
{
session_main_t *smm = &session_main;
if (smm->session_enable_asap)
{
vlib_worker_thread_barrier_sync (vm);
vnet_session_enable_disable (vm, 1 /* is_en */ );
vlib_worker_thread_barrier_release (vm);
}
return 0;
}
VLIB_INIT_FUNCTION (session_main_init);
VLIB_MAIN_LOOP_ENTER_FUNCTION (session_main_loop_init);
static clib_error_t *
session_config_fn (vlib_main_t * vm, unformat_input_t * input)
{
session_main_t *smm = &session_main;
u32 nitems;
uword tmp;
while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (input, "wrk-mq-length %d", &nitems))
{
if (nitems >= 2048)
smm->configured_wrk_mq_length = nitems;
else
clib_warning ("event queue length %d too small, ignored", nitems);
}
else if (unformat (input, "preallocated-sessions %d",
&smm->preallocated_sessions))
;
else if (unformat (input, "v4-session-table-buckets %d",
&smm->configured_v4_session_table_buckets))
;
else if (unformat (input, "v4-halfopen-table-buckets %d",
&smm->configured_v4_halfopen_table_buckets))
;
else if (unformat (input, "v6-session-table-buckets %d",
&smm->configured_v6_session_table_buckets))
;
else if (unformat (input, "v6-halfopen-table-buckets %d",
&smm->configured_v6_halfopen_table_buckets))
;
else if (unformat (input, "v4-session-table-memory %U",
unformat_memory_size, &tmp))
{
if (tmp >= 0x100000000)
return clib_error_return (0, "memory size %llx (%lld) too large",
tmp, tmp);
smm->configured_v4_session_table_memory = tmp;
}
else if (unformat (input, "v4-halfopen-table-memory %U",
unformat_memory_size, &tmp))
{
if (tmp >= 0x100000000)
return clib_error_return (0, "memory size %llx (%lld) too large",
tmp, tmp);
smm->configured_v4_halfopen_table_memory = tmp;
}
else if (unformat (input, "v6-session-table-memory %U",
unformat_memory_size, &tmp))
{
if (tmp >= 0x100000000)
return clib_error_return (0, "memory size %llx (%lld) too large",
tmp, tmp);
smm->configured_v6_session_table_memory = tmp;
}
else if (unformat (input, "v6-halfopen-table-memory %U",
unformat_memory_size, &tmp))
{
if (tmp >= 0x100000000)
return clib_error_return (0, "memory size %llx (%lld) too large",
tmp, tmp);
smm->configured_v6_halfopen_table_memory = tmp;
}
else if (unformat (input, "local-endpoints-table-memory %U",
unformat_memory_size, &tmp))
{
if (tmp >= 0x100000000)
return clib_error_return (0, "memory size %llx (%lld) too large",
tmp, tmp);
smm->local_endpoints_table_memory = tmp;
}
else if (unformat (input, "local-endpoints-table-buckets %d",
&smm->local_endpoints_table_buckets))
;
else if (unformat (input, "enable"))
smm->session_enable_asap = 1;
else if (unformat (input, "use-app-socket-api"))
(void) appns_sapi_enable_disable (1 /* is_enable */);
else if (unformat (input, "poll-main"))
smm->poll_main = 1;
else if (unformat (input, "use-private-rx-mqs"))
smm->use_private_rx_mqs = 1;
else if (unformat (input, "no-adaptive"))
smm->no_adaptive = 1;
/*
* Deprecated but maintained for compatibility
*/
else if (unformat (input, "evt_qs_memfd_seg"))
;
else if (unformat (input, "segment-baseva 0x%lx", &tmp))
;
else if (unformat (input, "evt_qs_seg_size %U", unformat_memory_size,
&tmp))
;
else if (unformat (input, "event-queue-length %d", &nitems))
{
if (nitems >= 2048)
smm->configured_wrk_mq_length = nitems;
else
clib_warning ("event queue length %d too small, ignored", nitems);
}
else
return clib_error_return (0, "unknown input `%U'",
format_unformat_error, input);
}
return 0;
}
VLIB_CONFIG_FUNCTION (session_config_fn, "session");
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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