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/*
* Copyright (c) 2017 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.
*/
#ifndef __included_session_h__
#define __included_session_h__
#include <vnet/session/stream_session.h>
#include <vnet/session/session_lookup.h>
#include <vnet/session/transport_interface.h>
#include <vnet/session/session_debug.h>
#include <vnet/session/segment_manager.h>
#include <svm/queue.h>
#define HALF_OPEN_LOOKUP_INVALID_VALUE ((u64)~0)
#define INVALID_INDEX ((u32)~0)
#define SESSION_PROXY_LISTENER_INDEX ((u32)~0 - 1)
/* TODO decide how much since we have pre-data as well */
#define MAX_HDRS_LEN 100 /* Max number of bytes for headers */
typedef enum
{
FIFO_EVENT_APP_RX,
FIFO_EVENT_APP_TX,
FIFO_EVENT_TIMEOUT,
FIFO_EVENT_DISCONNECT,
FIFO_EVENT_BUILTIN_RX,
FIFO_EVENT_RPC,
} fifo_event_type_t;
static inline const char *
fifo_event_type_str (fifo_event_type_t et)
{
switch (et)
{
case FIFO_EVENT_APP_RX:
return "FIFO_EVENT_APP_RX";
case FIFO_EVENT_APP_TX:
return "FIFO_EVENT_APP_TX";
case FIFO_EVENT_TIMEOUT:
return "FIFO_EVENT_TIMEOUT";
case FIFO_EVENT_DISCONNECT:
return "FIFO_EVENT_DISCONNECT";
case FIFO_EVENT_BUILTIN_RX:
return "FIFO_EVENT_BUILTIN_RX";
case FIFO_EVENT_RPC:
return "FIFO_EVENT_RPC";
default:
return "UNKNOWN FIFO EVENT";
}
}
#define foreach_session_input_error \
_(NO_SESSION, "No session drops") \
_(NO_LISTENER, "No listener for dst port drops") \
_(ENQUEUED, "Packets pushed into rx fifo") \
_(NOT_READY, "Session not ready packets") \
_(FIFO_FULL, "Packets dropped for lack of rx fifo space") \
_(EVENT_FIFO_FULL, "Events not sent for lack of event fifo space") \
_(API_QUEUE_FULL, "Sessions not created for lack of API queue space") \
_(NEW_SEG_NO_SPACE, "Created segment, couldn't allocate a fifo pair") \
_(NO_SPACE, "Couldn't allocate a fifo pair")
typedef enum
{
#define _(sym,str) SESSION_ERROR_##sym,
foreach_session_input_error
#undef _
SESSION_N_ERROR,
} session_error_t;
typedef struct
{
void *fp;
void *arg;
} rpc_args_t;
/* *INDENT-OFF* */
typedef CLIB_PACKED (struct {
union
{
svm_fifo_t * fifo;
u64 session_handle;
rpc_args_t rpc_args;
};
u8 event_type;
u8 postponed;
}) session_fifo_event_t;
/* *INDENT-ON* */
/* Forward definition */
typedef struct _session_manager_main session_manager_main_t;
typedef int
(session_fifo_rx_fn) (vlib_main_t * vm, vlib_node_runtime_t * node,
session_manager_main_t * smm,
session_fifo_event_t * e0, stream_session_t * s0,
u32 thread_index, int *n_tx_pkts);
extern session_fifo_rx_fn session_tx_fifo_peek_and_snd;
extern session_fifo_rx_fn session_tx_fifo_dequeue_and_snd;
u8 session_node_lookup_fifo_event (svm_fifo_t * f, session_fifo_event_t * e);
struct _session_manager_main
{
/** Per worker thread session pools */
stream_session_t **sessions;
/** Per worker-thread count of threads peeking into the session pool */
u32 *session_peekers;
/** Per worker-thread rw peekers locks */
clib_spinlock_t *peekers_readers_locks;
clib_spinlock_t *peekers_write_locks;
/** Pool of listen sessions. Same type as stream sessions to ease lookups */
stream_session_t **listen_sessions;
/** Per-proto, per-worker enqueue epoch counters */
u32 *current_enqueue_epoch[TRANSPORT_N_PROTO];
/** Per-proto, per-worker thread vector of sessions to enqueue */
u32 **session_to_enqueue[TRANSPORT_N_PROTO];
/** per-worker tx buffer free lists */
u32 **tx_buffers;
/** Per worker-thread vector of partially read events */
session_fifo_event_t **free_event_vector;
/** per-worker active event vectors */
session_fifo_event_t **pending_event_vector;
/** per-worker postponed disconnects */
session_fifo_event_t **pending_disconnects;
/** vpp fifo event queue */
svm_queue_t **vpp_event_queues;
/** Event queues memfd segment initialized only if so configured */
ssvm_private_t evt_qs_segment;
/** Unique segment name counter */
u32 unique_segment_name_counter;
/** Per transport rx function that can either dequeue or peek */
session_fifo_rx_fn **session_tx_fns;
/** Per session type output nodes. Could optimize to group nodes by
* fib but lookup would then require session type parsing in session node.
* Trade memory for speed, for now */
u32 *session_type_to_next;
/** Session manager is enabled */
u8 is_enabled;
/** vpp fifo event queue configured length */
u32 configured_event_queue_length;
/*
* Config parameters
*/
/** Session ssvm segment configs*/
uword session_baseva;
u32 segment_timeout;
u32 evt_qs_segment_size;
u8 evt_qs_use_memfd_seg;
/** Session table size parameters */
u32 configured_v4_session_table_buckets;
u32 configured_v4_session_table_memory;
u32 configured_v4_halfopen_table_buckets;
u32 configured_v4_halfopen_table_memory;
u32 configured_v6_session_table_buckets;
u32 configured_v6_session_table_memory;
u32 configured_v6_halfopen_table_buckets;
u32 configured_v6_halfopen_table_memory;
/** Transport table (preallocation) size parameters */
u32 local_endpoints_table_memory;
u32 local_endpoints_table_buckets;
/** Preallocate session config parameter */
u32 preallocated_sessions;
#if SESSION_DBG
/**
* last event poll time by thread
* Debug only. Will cause false cache-line sharing as-is
*/
f64 *last_event_poll_by_thread;
#endif
};
extern session_manager_main_t session_manager_main;
extern vlib_node_registration_t session_queue_node;
/*
* Session manager function
*/
always_inline session_manager_main_t *
vnet_get_session_manager_main ()
{
return &session_manager_main;
}
always_inline u8
stream_session_is_valid (u32 si, u8 thread_index)
{
stream_session_t *s;
s = pool_elt_at_index (session_manager_main.sessions[thread_index], si);
if (s->thread_index != thread_index || s->session_index != si
/* || s->server_rx_fifo->master_session_index != si
|| s->server_tx_fifo->master_session_index != si
|| s->server_rx_fifo->master_thread_index != thread_index
|| s->server_tx_fifo->master_thread_index != thread_index */ )
return 0;
return 1;
}
stream_session_t *session_alloc (u32 thread_index);
always_inline stream_session_t *
session_get (u32 si, u32 thread_index)
{
ASSERT (stream_session_is_valid (si, thread_index));
return pool_elt_at_index (session_manager_main.sessions[thread_index], si);
}
always_inline stream_session_t *
session_get_if_valid (u64 si, u32 thread_index)
{
if (thread_index >= vec_len (session_manager_main.sessions))
return 0;
if (pool_is_free_index (session_manager_main.sessions[thread_index], si))
return 0;
ASSERT (stream_session_is_valid (si, thread_index));
return pool_elt_at_index (session_manager_main.sessions[thread_index], si);
}
always_inline u64
session_handle (stream_session_t * s)
{
return ((u64) s->thread_index << 32) | (u64) s->session_index;
}
always_inline u32
session_index_from_handle (u64 handle)
{
return handle & 0xFFFFFFFF;
}
always_inline u32
session_thread_from_handle (u64 handle)
{
return handle >> 32;
}
always_inline void
session_parse_handle (u64 handle, u32 * index, u32 * thread_index)
{
*index = session_index_from_handle (handle);
*thread_index = session_thread_from_handle (handle);
}
always_inline stream_session_t *
session_get_from_handle (u64 handle)
{
session_manager_main_t *smm = &session_manager_main;
return
pool_elt_at_index (smm->sessions[session_thread_from_handle (handle)],
session_index_from_handle (handle));
}
always_inline transport_proto_t
session_get_transport_proto (stream_session_t * s)
{
return (s->session_type >> 1);
}
always_inline session_type_t
session_type_from_proto_and_ip (transport_proto_t proto, u8 is_ip4)
{
return (proto << 1 | is_ip4);
}
/**
* Acquires a lock that blocks a session pool from expanding.
*
* This is typically used for safely peeking into other threads'
* pools in order to clone elements. Lock should be dropped as soon
* as possible by calling @ref session_pool_remove_peeker.
*
* NOTE: Avoid using pool_elt_at_index while the lock is held because
* it may lead to free elt bitmap expansion/contraction!
*/
always_inline void
session_pool_add_peeker (u32 thread_index)
{
session_manager_main_t *smm = &session_manager_main;
if (thread_index == vlib_get_thread_index ())
return;
clib_spinlock_lock_if_init (&smm->peekers_readers_locks[thread_index]);
smm->session_peekers[thread_index] += 1;
if (smm->session_peekers[thread_index] == 1)
clib_spinlock_lock_if_init (&smm->peekers_write_locks[thread_index]);
clib_spinlock_unlock_if_init (&smm->peekers_readers_locks[thread_index]);
}
always_inline void
session_pool_remove_peeker (u32 thread_index)
{
session_manager_main_t *smm = &session_manager_main;
if (thread_index == vlib_get_thread_index ())
return;
ASSERT (session_manager_main.session_peekers[thread_index] > 0);
clib_spinlock_lock_if_init (&smm->peekers_readers_locks[thread_index]);
smm->session_peekers[thread_index] -= 1;
if (smm->session_peekers[thread_index] == 0)
clib_spinlock_unlock_if_init (&smm->peekers_write_locks[thread_index]);
clib_spinlock_unlock_if_init (&smm->peekers_readers_locks[thread_index]);
}
/**
* Get session from handle and 'lock' pool resize if not in same thread
*
* Caller should drop the peek 'lock' as soon as possible.
*/
always_inline stream_session_t *
session_get_from_handle_safe (u64 handle)
{
session_manager_main_t *smm = &session_manager_main;
u32 thread_index = session_thread_from_handle (handle);
if (thread_index == vlib_get_thread_index ())
{
return pool_elt_at_index (smm->sessions[thread_index],
session_index_from_handle (handle));
}
else
{
session_pool_add_peeker (thread_index);
/* Don't use pool_elt_at index. See @ref session_pool_add_peeker */
return smm->sessions[thread_index] + session_index_from_handle (handle);
}
}
always_inline stream_session_t *
stream_session_listener_get (u8 sst, u64 si)
{
return pool_elt_at_index (session_manager_main.listen_sessions[sst], si);
}
always_inline u32
stream_session_get_index (stream_session_t * s)
{
if (s->session_state == SESSION_STATE_LISTENING)
return s - session_manager_main.listen_sessions[s->session_type];
return s - session_manager_main.sessions[s->thread_index];
}
always_inline u32
stream_session_max_rx_enqueue (transport_connection_t * tc)
{
stream_session_t *s = session_get (tc->s_index, tc->thread_index);
return svm_fifo_max_enqueue (s->server_rx_fifo);
}
always_inline u32
stream_session_rx_fifo_size (transport_connection_t * tc)
{
stream_session_t *s = session_get (tc->s_index, tc->thread_index);
return s->server_rx_fifo->nitems;
}
always_inline u32
session_get_index (stream_session_t * s)
{
return (s - session_manager_main.sessions[s->thread_index]);
}
always_inline stream_session_t *
session_clone_safe (u32 session_index, u32 thread_index)
{
stream_session_t *old_s, *new_s;
u32 current_thread_index = vlib_get_thread_index ();
/* If during the memcpy pool is reallocated AND the memory allocator
* decides to give the old chunk of memory to somebody in a hurry to
* scribble something on it, we have a problem. So add this thread as
* a session pool peeker.
*/
session_pool_add_peeker (thread_index);
new_s = session_alloc (current_thread_index);
old_s = session_manager_main.sessions[thread_index] + session_index;
clib_memcpy (new_s, old_s, sizeof (*new_s));
session_pool_remove_peeker (thread_index);
new_s->thread_index = current_thread_index;
new_s->session_index = session_get_index (new_s);
return new_s;
}
transport_connection_t *session_get_transport (stream_session_t * s);
u32 stream_session_tx_fifo_max_dequeue (transport_connection_t * tc);
stream_session_t *session_alloc (u32 thread_index);
int
session_enqueue_stream_connection (transport_connection_t * tc,
vlib_buffer_t * b, u32 offset,
u8 queue_event, u8 is_in_order);
int session_enqueue_dgram_connection (stream_session_t * s, vlib_buffer_t * b,
u8 proto, u8 queue_event);
int stream_session_peek_bytes (transport_connection_t * tc, u8 * buffer,
u32 offset, u32 max_bytes);
u32 stream_session_dequeue_drop (transport_connection_t * tc, u32 max_bytes);
int session_stream_connect_notify (transport_connection_t * tc, u8 is_fail);
int session_dgram_connect_notify (transport_connection_t * tc,
u32 old_thread_index,
stream_session_t ** new_session);
void stream_session_init_fifos_pointers (transport_connection_t * tc,
u32 rx_pointer, u32 tx_pointer);
void stream_session_accept_notify (transport_connection_t * tc);
void stream_session_disconnect_notify (transport_connection_t * tc);
void stream_session_delete_notify (transport_connection_t * tc);
void stream_session_reset_notify (transport_connection_t * tc);
int stream_session_accept (transport_connection_t * tc, u32 listener_index,
u8 notify);
int session_open (u32 app_index, session_endpoint_t * tep, u32 opaque);
int stream_session_listen (stream_session_t * s, session_endpoint_t * tep);
int stream_session_stop_listen (stream_session_t * s);
void stream_session_disconnect (stream_session_t * s);
void stream_session_cleanup (stream_session_t * s);
void session_send_session_evt_to_thread (u64 session_handle,
fifo_event_type_t evt_type,
u32 thread_index);
ssvm_private_t *session_manager_get_evt_q_segment (void);
u8 *format_stream_session (u8 * s, va_list * args);
uword unformat_stream_session (unformat_input_t * input, va_list * args);
uword unformat_transport_connection (unformat_input_t * input,
va_list * args);
void session_register_transport (transport_proto_t transport_proto,
const transport_proto_vft_t * vft, u8 is_ip4,
u32 output_node);
clib_error_t *vnet_session_enable_disable (vlib_main_t * vm, u8 is_en);
always_inline svm_queue_t *
session_manager_get_vpp_event_queue (u32 thread_index)
{
return session_manager_main.vpp_event_queues[thread_index];
}
int session_manager_flush_enqueue_events (u8 proto, u32 thread_index);
always_inline u64
listen_session_get_handle (stream_session_t * s)
{
ASSERT (s->session_state == SESSION_STATE_LISTENING);
return ((u64) s->session_type << 32) | s->session_index;
}
always_inline stream_session_t *
listen_session_get_from_handle (u64 handle)
{
session_manager_main_t *smm = &session_manager_main;
stream_session_t *s;
u32 type, index;
type = handle >> 32;
index = handle & 0xFFFFFFFF;
if (pool_is_free_index (smm->listen_sessions[type], index))
return 0;
s = pool_elt_at_index (smm->listen_sessions[type], index);
ASSERT (s->session_state == SESSION_STATE_LISTENING);
return s;
}
always_inline stream_session_t *
listen_session_new (session_type_t type)
{
stream_session_t *s;
pool_get_aligned (session_manager_main.listen_sessions[type], s,
CLIB_CACHE_LINE_BYTES);
memset (s, 0, sizeof (*s));
s->session_type = type;
s->session_state = SESSION_STATE_LISTENING;
s->session_index = s - session_manager_main.listen_sessions[type];
return s;
}
always_inline stream_session_t *
listen_session_get (session_type_t type, u32 index)
{
return pool_elt_at_index (session_manager_main.listen_sessions[type],
index);
}
always_inline void
listen_session_del (stream_session_t * s)
{
pool_put (session_manager_main.listen_sessions[s->session_type], s);
}
transport_connection_t *listen_session_get_transport (stream_session_t * s);
int
listen_session_get_local_session_endpoint (stream_session_t * listener,
session_endpoint_t * sep);
always_inline stream_session_t *
session_manager_get_listener (u8 session_type, u32 index)
{
return
pool_elt_at_index (session_manager_main.listen_sessions[session_type],
index);
}
/**
* Set peek or dequeue function for given session type
*
* Reliable transport protocols will probably want to use a peek function
*/
always_inline void
session_manager_set_transport_rx_fn (session_type_t type, u8 is_peek)
{
session_manager_main.session_tx_fns[type] = (is_peek) ?
session_tx_fifo_peek_and_snd : session_tx_fifo_dequeue_and_snd;
}
always_inline u8
session_manager_is_enabled ()
{
return session_manager_main.is_enabled == 1;
}
#define session_cli_return_if_not_enabled() \
do { \
if (!session_manager_main.is_enabled) \
return clib_error_return(0, "session layer is not enabled"); \
} while (0)
void session_node_enable_disable (u8 is_en);
#endif /* __included_session_h__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/