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/*
*------------------------------------------------------------------
* vlib_api.c VLIB API implementation
*
* Copyright (c) 2009 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.
*------------------------------------------------------------------
*/
#include <fcntl.h>
#include <pthread.h>
#include <vppinfra/vec.h>
#include <vppinfra/hash.h>
#include <vppinfra/pool.h>
#include <vppinfra/format.h>
#include <vppinfra/byte_order.h>
#include <vppinfra/elog.h>
#include <vlib/vlib.h>
#include <vlib/unix/unix.h>
#include <vlibapi/api.h>
#include <vlibmemory/api.h>
/**
* @file
* @brief Binary API messaging via shared memory
* Low-level, primary provisioning interface
*/
/*? %%clicmd:group_label Binary API CLI %% ?*/
/*? %%syscfg:group_label Binary API configuration %% ?*/
#define TRACE_VLIB_MEMORY_QUEUE 0
#include <vlibmemory/vl_memory_msg_enum.h> /* enumerate all vlib messages */
#define vl_typedefs /* define message structures */
#include <vlibmemory/vl_memory_api_h.h>
#undef vl_typedefs
/* instantiate all the print functions we know about */
#define vl_print(handle, ...) vlib_cli_output (handle, __VA_ARGS__)
#define vl_printfun
#include <vlibmemory/vl_memory_api_h.h>
#undef vl_printfun
static inline void *
vl_api_trace_plugin_msg_ids_t_print (vl_api_trace_plugin_msg_ids_t * a,
void *handle)
{
vl_print (handle, "vl_api_trace_plugin_msg_ids: %s first %u last %u\n",
a->plugin_name,
clib_host_to_net_u16 (a->first_msg_id),
clib_host_to_net_u16 (a->last_msg_id));
return handle;
}
/* instantiate all the endian swap functions we know about */
#define vl_endianfun
#include <vlibmemory/vl_memory_api_h.h>
#undef vl_endianfun
u8 *
vl_api_serialize_message_table (api_main_t * am, u8 * vector)
{
serialize_main_t _sm, *sm = &_sm;
hash_pair_t *hp;
u32 nmsg = hash_elts (am->msg_index_by_name_and_crc);
serialize_open_vector (sm, vector);
/* serialize the count */
serialize_integer (sm, nmsg, sizeof (u32));
/* *INDENT-OFF* */
hash_foreach_pair (hp, am->msg_index_by_name_and_crc,
({
serialize_likely_small_unsigned_integer (sm, hp->value[0]);
serialize_cstring (sm, (char *) hp->key);
}));
/* *INDENT-ON* */
return serialize_close_vector (sm);
}
static void
vl_api_get_first_msg_id_t_handler (vl_api_get_first_msg_id_t * mp)
{
vl_api_get_first_msg_id_reply_t *rmp;
vl_api_registration_t *regp;
uword *p;
api_main_t *am = &api_main;
vl_api_msg_range_t *rp;
u8 name[64];
u16 first_msg_id = ~0;
int rv = -7; /* VNET_API_ERROR_INVALID_VALUE */
regp = vl_api_client_index_to_registration (mp->client_index);
if (!regp)
return;
if (am->msg_range_by_name == 0)
goto out;
strncpy ((char *) name, (char *) mp->name, ARRAY_LEN (name));
name[ARRAY_LEN (name) - 1] = '\0';
p = hash_get_mem (am->msg_range_by_name, name);
if (p == 0)
goto out;
rp = vec_elt_at_index (am->msg_ranges, p[0]);
first_msg_id = rp->first_msg_id;
rv = 0;
out:
rmp = vl_msg_api_alloc (sizeof (*rmp));
rmp->_vl_msg_id = ntohs (VL_API_GET_FIRST_MSG_ID_REPLY);
rmp->context = mp->context;
rmp->retval = ntohl (rv);
rmp->first_msg_id = ntohs (first_msg_id);
vl_api_send_msg (regp, (u8 *) rmp);
}
void
vl_api_api_versions_t_handler (vl_api_api_versions_t * mp)
{
api_main_t *am = &api_main;
vl_api_api_versions_reply_t *rmp;
vl_api_registration_t *reg;
u32 nmsg = vec_len (am->api_version_list);
int msg_size = sizeof (*rmp) + sizeof (rmp->api_versions[0]) * nmsg;
int i;
reg = vl_api_client_index_to_registration (mp->client_index);
if (!reg)
return;
rmp = vl_msg_api_alloc (msg_size);
clib_memset (rmp, 0, msg_size);
rmp->_vl_msg_id = ntohs (VL_API_API_VERSIONS_REPLY);
/* fill in the message */
rmp->context = mp->context;
rmp->count = htonl (nmsg);
for (i = 0; i < nmsg; ++i)
{
api_version_t *vl = &am->api_version_list[i];
rmp->api_versions[i].major = htonl (vl->major);
rmp->api_versions[i].minor = htonl (vl->minor);
rmp->api_versions[i].patch = htonl (vl->patch);
strncpy ((char *) rmp->api_versions[i].name, vl->name,
ARRAY_LEN (rmp->api_versions[i].name));
rmp->api_versions[i].name[ARRAY_LEN (rmp->api_versions[i].name) - 1] =
'\0';
}
vl_api_send_msg (reg, (u8 *) rmp);
}
#define foreach_vlib_api_msg \
_(GET_FIRST_MSG_ID, get_first_msg_id) \
_(API_VERSIONS, api_versions)
/*
* vl_api_init
*/
static int
vlib_api_init (void)
{
vl_msg_api_msg_config_t cfg;
vl_msg_api_msg_config_t *c = &cfg;
clib_memset (c, 0, sizeof (*c));
#define _(N,n) do { \
c->id = VL_API_##N; \
c->name = #n; \
c->handler = vl_api_##n##_t_handler; \
c->cleanup = vl_noop_handler; \
c->endian = vl_api_##n##_t_endian; \
c->print = vl_api_##n##_t_print; \
c->size = sizeof(vl_api_##n##_t); \
c->traced = 1; /* trace, so these msgs print */ \
c->replay = 0; /* don't replay client create/delete msgs */ \
c->message_bounce = 0; /* don't bounce this message */ \
vl_msg_api_config(c);} while (0);
foreach_vlib_api_msg;
#undef _
return 0;
}
u64 vector_rate_histogram[SLEEP_N_BUCKETS];
/*
* Callback to send ourselves a plugin numbering-space trace msg
*/
static void
send_one_plugin_msg_ids_msg (u8 * name, u16 first_msg_id, u16 last_msg_id)
{
vl_api_trace_plugin_msg_ids_t *mp;
api_main_t *am = &api_main;
vl_shmem_hdr_t *shmem_hdr = am->shmem_hdr;
svm_queue_t *q;
mp = vl_msg_api_alloc_as_if_client (sizeof (*mp));
clib_memset (mp, 0, sizeof (*mp));
mp->_vl_msg_id = clib_host_to_net_u16 (VL_API_TRACE_PLUGIN_MSG_IDS);
strncpy ((char *) mp->plugin_name, (char *) name,
sizeof (mp->plugin_name) - 1);
mp->first_msg_id = clib_host_to_net_u16 (first_msg_id);
mp->last_msg_id = clib_host_to_net_u16 (last_msg_id);
q = shmem_hdr->vl_input_queue;
vl_msg_api_send_shmem (q, (u8 *) & mp);
}
void
vl_api_save_msg_table (void)
{
u8 *serialized_message_table;
api_main_t *am = &api_main;
u8 *chroot_file;
int fd, rv;
/*
* Snapshoot the api message table.
*/
if (strstr ((char *) am->save_msg_table_filename, "..")
|| index ((char *) am->save_msg_table_filename, '/'))
{
clib_warning ("illegal save-message-table filename '%s'",
am->save_msg_table_filename);
return;
}
chroot_file = format (0, "/tmp/%s%c", am->save_msg_table_filename, 0);
fd = creat ((char *) chroot_file, 0644);
if (fd < 0)
{
clib_unix_warning ("creat");
return;
}
serialized_message_table = vl_api_serialize_message_table (am, 0);
rv = write (fd, serialized_message_table,
vec_len (serialized_message_table));
if (rv != vec_len (serialized_message_table))
clib_unix_warning ("write");
rv = close (fd);
if (rv < 0)
clib_unix_warning ("close");
vec_free (chroot_file);
vec_free (serialized_message_table);
}
static uword
vl_api_clnt_process (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * f)
{
int private_segment_rotor = 0, i, rv;
vl_socket_args_for_process_t *a;
vl_shmem_hdr_t *shm;
svm_queue_t *q;
clib_error_t *e;
api_main_t *am = &api_main;
f64 dead_client_scan_time;
f64 sleep_time, start_time;
f64 vector_rate;
clib_error_t *error;
uword event_type;
uword *event_data = 0;
f64 now;
if ((error = vl_sock_api_init (vm)))
{
clib_error_report (error);
clib_warning ("socksvr_api_init failed, quitting...");
return 0;
}
if ((rv = vlib_api_init ()) < 0)
{
clib_warning ("vlib_api_init returned %d, quitting...", rv);
return 0;
}
shm = am->shmem_hdr;
q = shm->vl_input_queue;
e = vlib_call_init_exit_functions
(vm, vm->api_init_function_registrations, 1 /* call_once */ );
if (e)
clib_error_report (e);
sleep_time = 10.0;
dead_client_scan_time = vlib_time_now (vm) + 10.0;
/*
* Send plugin message range messages for each plugin we loaded
*/
for (i = 0; i < vec_len (am->msg_ranges); i++)
{
vl_api_msg_range_t *rp = am->msg_ranges + i;
send_one_plugin_msg_ids_msg (rp->name, rp->first_msg_id,
rp->last_msg_id);
}
/*
* Save the api message table snapshot, if configured
*/
if (am->save_msg_table_filename)
vl_api_save_msg_table ();
/* $$$ pay attention to frame size, control CPU usage */
while (1)
{
/*
* There's a reason for checking the queue before
* sleeping. If the vlib application crashes, it's entirely
* possible for a client to enqueue a connect request
* during the process restart interval.
*
* Unless some force of physics causes the new incarnation
* of the application to process the request, the client will
* sit and wait for Godot...
*/
vector_rate = vlib_last_vector_length_per_node (vm);
start_time = vlib_time_now (vm);
while (1)
{
if (vl_mem_api_handle_rpc (vm, node)
|| vl_mem_api_handle_msg_main (vm, node))
{
vm->api_queue_nonempty = 0;
VL_MEM_API_LOG_Q_LEN ("q-underflow: len %d", 0);
sleep_time = 20.0;
break;
}
/* Allow no more than 10us without a pause */
if (vlib_time_now (vm) > start_time + 10e-6)
{
int index = SLEEP_400_US;
if (vector_rate > 40.0)
sleep_time = 400e-6;
else if (vector_rate > 20.0)
{
index = SLEEP_200_US;
sleep_time = 200e-6;
}
else if (vector_rate >= 1.0)
{
index = SLEEP_100_US;
sleep_time = 100e-6;
}
else
{
index = SLEEP_10_US;
sleep_time = 10e-6;
}
vector_rate_histogram[index] += 1;
break;
}
}
/*
* see if we have any private api shared-memory segments
* If so, push required context variables, and process
* a message.
*/
if (PREDICT_FALSE (vec_len (am->vlib_private_rps)))
{
if (private_segment_rotor >= vec_len (am->vlib_private_rps))
private_segment_rotor = 0;
vl_mem_api_handle_msg_private (vm, node, private_segment_rotor++);
}
vlib_process_wait_for_event_or_clock (vm, sleep_time);
vec_reset_length (event_data);
event_type = vlib_process_get_events (vm, &event_data);
now = vlib_time_now (vm);
switch (event_type)
{
case QUEUE_SIGNAL_EVENT:
vm->queue_signal_pending = 0;
VL_MEM_API_LOG_Q_LEN ("q-awake: len %d", q->cursize);
break;
case SOCKET_READ_EVENT:
for (i = 0; i < vec_len (event_data); i++)
{
a = pool_elt_at_index (socket_main.process_args, event_data[i]);
vl_socket_process_api_msg (a->clib_file, a->regp,
(i8 *) a->data);
vec_free (a->data);
pool_put (socket_main.process_args, a);
}
break;
/* Timeout... */
case -1:
break;
default:
clib_warning ("unknown event type %d", event_type);
break;
}
if (now > dead_client_scan_time)
{
vl_mem_api_dead_client_scan (am, shm, now);
dead_client_scan_time = vlib_time_now (vm) + 10.0;
}
}
return 0;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (vl_api_clnt_node) =
{
.function = vl_api_clnt_process,
.type = VLIB_NODE_TYPE_PROCESS,
.name = "api-rx-from-ring",
.state = VLIB_NODE_STATE_DISABLED,
};
/* *INDENT-ON* */
void
vl_mem_api_enable_disable (vlib_main_t * vm, int enable)
{
vlib_node_set_state (vm, vl_api_clnt_node.index,
(enable
? VLIB_NODE_STATE_POLLING
: VLIB_NODE_STATE_DISABLED));
}
static uword
api_rx_from_node (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
uword n_packets = frame->n_vectors;
uword n_left_from;
u32 *from;
static u8 *long_msg;
vec_validate (long_msg, 4095);
n_left_from = frame->n_vectors;
from = vlib_frame_vector_args (frame);
while (n_left_from > 0)
{
u32 bi0;
vlib_buffer_t *b0;
void *msg;
uword msg_len;
bi0 = from[0];
b0 = vlib_get_buffer (vm, bi0);
from += 1;
n_left_from -= 1;
msg = b0->data + b0->current_data;
msg_len = b0->current_length;
if (b0->flags & VLIB_BUFFER_NEXT_PRESENT)
{
ASSERT (long_msg != 0);
_vec_len (long_msg) = 0;
vec_add (long_msg, msg, msg_len);
while (b0->flags & VLIB_BUFFER_NEXT_PRESENT)
{
b0 = vlib_get_buffer (vm, b0->next_buffer);
msg = b0->data + b0->current_data;
msg_len = b0->current_length;
vec_add (long_msg, msg, msg_len);
}
msg = long_msg;
}
vl_msg_api_handler_no_trace_no_free (msg);
}
/* Free what we've been given. */
vlib_buffer_free (vm, vlib_frame_vector_args (frame), n_packets);
return n_packets;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (api_rx_from_node_node,static) = {
.function = api_rx_from_node,
.type = VLIB_NODE_TYPE_INTERNAL,
.vector_size = 4,
.name = "api-rx-from-node",
};
/* *INDENT-ON* */
static void
vl_api_rpc_call_t_handler (vl_api_rpc_call_t * mp)
{
vl_api_rpc_call_reply_t *rmp;
int (*fp) (void *);
i32 rv = 0;
vlib_main_t *vm = vlib_get_main ();
if (mp->function == 0)
{
rv = -1;
clib_warning ("rpc NULL function pointer");
}
else
{
if (mp->need_barrier_sync)
vlib_worker_thread_barrier_sync (vm);
fp = uword_to_pointer (mp->function, int (*)(void *));
rv = fp (mp->data);
if (mp->need_barrier_sync)
vlib_worker_thread_barrier_release (vm);
}
if (mp->send_reply)
{
svm_queue_t *q = vl_api_client_index_to_input_queue (mp->client_index);
if (q)
{
rmp = vl_msg_api_alloc_as_if_client (sizeof (*rmp));
rmp->_vl_msg_id = ntohs (VL_API_RPC_CALL_REPLY);
rmp->context = mp->context;
rmp->retval = rv;
vl_msg_api_send_shmem (q, (u8 *) & rmp);
}
}
if (mp->multicast)
{
clib_warning ("multicast not yet implemented...");
}
}
static void
vl_api_rpc_call_reply_t_handler (vl_api_rpc_call_reply_t * mp)
{
clib_warning ("unimplemented");
}
void
vl_api_send_pending_rpc_requests (vlib_main_t * vm)
{
vlib_main_t *vm_global = &vlib_global_main;
ASSERT (vm != vm_global);
clib_spinlock_lock_if_init (&vm_global->pending_rpc_lock);
vec_append (vm_global->pending_rpc_requests, vm->pending_rpc_requests);
vec_reset_length (vm->pending_rpc_requests);
clib_spinlock_unlock_if_init (&vm_global->pending_rpc_lock);
}
always_inline void
vl_api_rpc_call_main_thread_inline (void *fp, u8 * data, u32 data_length,
u8 force_rpc)
{
vl_api_rpc_call_t *mp;
vlib_main_t *vm_global = &vlib_global_main;
vlib_main_t *vm = vlib_get_main ();
/* Main thread and not a forced RPC: call the function directly */
if ((force_rpc == 0) && (vlib_get_thread_index () == 0))
{
void (*call_fp) (void *);
vlib_worker_thread_barrier_sync (vm);
call_fp = fp;
call_fp (data);
vlib_worker_thread_barrier_release (vm);
return;
}
/* Otherwise, actually do an RPC */
mp = vl_msg_api_alloc_as_if_client (sizeof (*mp) + data_length);
clib_memset (mp, 0, sizeof (*mp));
clib_memcpy_fast (mp->data, data, data_length);
mp->_vl_msg_id = ntohs (VL_API_RPC_CALL);
mp->function = pointer_to_uword (fp);
mp->need_barrier_sync = 1;
/* Add to the pending vector. Thread 0 requires locking. */
if (vm == vm_global)
clib_spinlock_lock_if_init (&vm_global->pending_rpc_lock);
vec_add1 (vm->pending_rpc_requests, (uword) mp);
if (vm == vm_global)
clib_spinlock_unlock_if_init (&vm_global->pending_rpc_lock);
}
/*
* Check if called from worker threads.
* If so, make rpc call of fp through shmem.
* Otherwise, call fp directly
*/
void
vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length)
{
vl_api_rpc_call_main_thread_inline (fp, data, data_length, /*force_rpc */
0);
}
/*
* Always make rpc call of fp through shmem, useful for calling from threads
* not setup as worker threads, such as DPDK callback thread
*/
void
vl_api_force_rpc_call_main_thread (void *fp, u8 * data, u32 data_length)
{
vl_api_rpc_call_main_thread_inline (fp, data, data_length, /*force_rpc */
1);
}
static void
vl_api_trace_plugin_msg_ids_t_handler (vl_api_trace_plugin_msg_ids_t * mp)
{
api_main_t *am = &api_main;
vl_api_msg_range_t *rp;
uword *p;
/* Noop (except for tracing) during normal operation */
if (am->replay_in_progress == 0)
return;
p = hash_get_mem (am->msg_range_by_name, mp->plugin_name);
if (p == 0)
{
clib_warning ("WARNING: traced plugin '%s' not in current image",
mp->plugin_name);
return;
}
rp = vec_elt_at_index (am->msg_ranges, p[0]);
if (rp->first_msg_id != clib_net_to_host_u16 (mp->first_msg_id))
{
clib_warning ("WARNING: traced plugin '%s' first message id %d not %d",
mp->plugin_name, clib_net_to_host_u16 (mp->first_msg_id),
rp->first_msg_id);
}
if (rp->last_msg_id != clib_net_to_host_u16 (mp->last_msg_id))
{
clib_warning ("WARNING: traced plugin '%s' last message id %d not %d",
mp->plugin_name, clib_net_to_host_u16 (mp->last_msg_id),
rp->last_msg_id);
}
}
#define foreach_rpc_api_msg \
_(RPC_CALL,rpc_call) \
_(RPC_CALL_REPLY,rpc_call_reply)
#define foreach_plugin_trace_msg \
_(TRACE_PLUGIN_MSG_IDS,trace_plugin_msg_ids)
/*
* Set the rpc callback at our earliest possible convenience.
* This avoids ordering issues between thread_init() -> start_workers and
* an init function which we could define here. If we ever intend to use
* vlib all by itself, we can't create a link-time dependency on
* an init function here and a typical "call foo_init first"
* guitar lick.
*/
extern void *rpc_call_main_thread_cb_fn;
static clib_error_t *
rpc_api_hookup (vlib_main_t * vm)
{
api_main_t *am = &api_main;
#define _(N,n) \
vl_msg_api_set_handlers(VL_API_##N, #n, \
vl_api_##n##_t_handler, \
vl_noop_handler, \
vl_noop_handler, \
vl_api_##n##_t_print, \
sizeof(vl_api_##n##_t), 0 /* do not trace */);
foreach_rpc_api_msg;
#undef _
#define _(N,n) \
vl_msg_api_set_handlers(VL_API_##N, #n, \
vl_api_##n##_t_handler, \
vl_noop_handler, \
vl_noop_handler, \
vl_api_##n##_t_print, \
sizeof(vl_api_##n##_t), 1 /* do trace */);
foreach_plugin_trace_msg;
#undef _
/* No reason to halt the parade to create a trace record... */
am->is_mp_safe[VL_API_TRACE_PLUGIN_MSG_IDS] = 1;
rpc_call_main_thread_cb_fn = vl_api_rpc_call_main_thread;
return 0;
}
VLIB_API_INIT_FUNCTION (rpc_api_hookup);
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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