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/*
* Copyright (c) 2024 InMon Corp.
* 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 <sflow/sflow_vapi.h>
#ifdef SFLOW_USE_VAPI
#include <vlibapi/api.h>
#include <vlibmemory/api.h>
#include <vpp/app/version.h>
#include <stdbool.h>
#include <vapi/vapi.h>
#include <vapi/memclnt.api.vapi.h>
#include <vapi/vlib.api.vapi.h>
#ifdef included_interface_types_api_types_h
#define defined_vapi_enum_if_status_flags
#define defined_vapi_enum_mtu_proto
#define defined_vapi_enum_link_duplex
#define defined_vapi_enum_sub_if_flags
#define defined_vapi_enum_rx_mode
#define defined_vapi_enum_if_type
#define defined_vapi_enum_direction
#endif
#include <vapi/lcp.api.vapi.h>
DEFINE_VAPI_MSG_IDS_LCP_API_JSON;
static vapi_error_e
my_pair_get_cb (struct vapi_ctx_s *ctx, void *callback_ctx, vapi_error_e rv,
bool is_last, vapi_payload_lcp_itf_pair_get_v2_reply *reply)
{
// this is a no-op, but it seems like it's presence is still required. For
// example, it is called if the pair lookup does not find anything.
return VAPI_OK;
}
static vapi_error_e
my_pair_details_cb (struct vapi_ctx_s *ctx, void *callback_ctx,
vapi_error_e rv, bool is_last,
vapi_payload_lcp_itf_pair_details *details)
{
sflow_per_interface_data_t *sfif =
(sflow_per_interface_data_t *) callback_ctx;
// Setting this here will mean it is sent to hsflowd with the interface
// counters.
sfif->linux_if_index = details->vif_index;
return VAPI_OK;
}
static vapi_error_e
sflow_vapi_connect (sflow_vapi_client_t *vac)
{
vapi_error_e rv = VAPI_OK;
vapi_ctx_t ctx = vac->vapi_ctx;
if (ctx == NULL)
{
// first time - open and connect.
if ((rv = vapi_ctx_alloc (&ctx)) != VAPI_OK)
{
SFLOW_ERR ("vap_ctx_alloc() returned %d", rv);
}
else
{
vac->vapi_ctx = ctx;
if ((rv = vapi_connect_from_vpp (
ctx, "api_from_sflow_plugin", SFLOW_VAPI_MAX_REQUEST_Q,
SFLOW_VAPI_MAX_RESPONSE_Q, VAPI_MODE_BLOCKING, true)) !=
VAPI_OK)
{
SFLOW_ERR ("vapi_connect_from_vpp() returned %d", rv);
}
else
{
// Connected - but is there a handler for the request we want to
// send?
if (!vapi_is_msg_available (ctx,
vapi_msg_id_lcp_itf_pair_add_del_v2))
{
SFLOW_WARN ("vapi_is_msg_available() returned false => "
"linux-cp plugin not loaded");
rv = VAPI_EUSER;
}
}
}
}
return rv;
}
// in forked thread
static void *
get_lcp_itf_pairs (void *magic)
{
sflow_vapi_client_t *vac = magic;
vapi_error_e rv = VAPI_OK;
sflow_per_interface_data_t *intfs = vac->vapi_itfs;
vlib_set_thread_name (SFLOW_VAPI_THREAD_NAME);
if ((rv = sflow_vapi_connect (vac)) != VAPI_OK)
{
vac->vapi_unavailable = true;
}
else
{
vapi_ctx_t ctx = vac->vapi_ctx;
for (int ii = 1; ii < vec_len (intfs); ii++)
{
sflow_per_interface_data_t *sfif = vec_elt_at_index (intfs, ii);
if (sfif && sfif->sflow_enabled)
{
// TODO: if we try non-blocking we might not be able to just pour
// all the requests in here. Might be better to do them one at a
// time - e.g. when we poll for counters.
vapi_msg_lcp_itf_pair_get_v2 *msg =
vapi_alloc_lcp_itf_pair_get_v2 (ctx);
if (msg)
{
msg->payload.sw_if_index = sfif->sw_if_index;
if ((rv = vapi_lcp_itf_pair_get_v2 (ctx, msg, my_pair_get_cb,
sfif, my_pair_details_cb,
sfif)) != VAPI_OK)
{
SFLOW_ERR ("vapi_lcp_itf_pair_get_v2 returned %d", rv);
// vapi.h: "message must be freed by vapi_msg_free if not
// consumed by vapi_send"
vapi_msg_free (ctx, msg);
}
}
}
}
// We no longer disconnect or free the client structures
// vapi_disconnect_from_vpp (ctx);
// vapi_ctx_free (ctx);
}
// indicate that we are done - more portable that using pthread_tryjoin_np()
vac->vapi_request_status = (int) rv;
clib_atomic_store_rel_n (&vac->vapi_request_active, false);
// TODO: how to tell if heap-allocated data is stored separately per thread?
// And if so, how to tell the allocator to GC all data for the thread when it
// exits?
return (void *) rv;
}
int
sflow_vapi_read_linux_if_index_numbers (sflow_vapi_client_t *vac,
sflow_per_interface_data_t *itfs)
{
#ifdef SFLOW_VAPI_TEST_PLUGIN_SYMBOL
// don't even fork the query thread if the symbol is not there
if (!vlib_get_plugin_symbol ("linux_cp_plugin.so", "lcp_itf_pair_get"))
{
return false;
}
#endif
// previous query is done and results extracted?
int req_active = clib_atomic_load_acq_n (&vac->vapi_request_active);
if (req_active == false && vac->vapi_itfs == NULL)
{
// make a copy of the current interfaces vector for the lookup thread to
// write into
vac->vapi_itfs = vec_dup (itfs);
pthread_attr_t attr;
pthread_attr_init (&attr);
pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
pthread_attr_setstacksize (&attr, VLIB_THREAD_STACK_SIZE);
vac->vapi_request_active = true;
pthread_create (&vac->vapi_thread, &attr, get_lcp_itf_pairs, vac);
pthread_attr_destroy (&attr);
return true;
}
return false;
}
int
sflow_vapi_check_for_linux_if_index_results (sflow_vapi_client_t *vac,
sflow_per_interface_data_t *itfs)
{
// request completed?
// TODO: if we use non-blocking mode do we have to call something here to
// receive results?
int req_active = clib_atomic_load_acq_n (&vac->vapi_request_active);
if (req_active == false && vac->vapi_itfs != NULL)
{
// yes, extract what we learned
// TODO: would not have to do this if vector were array of pointers
// to sflow_per_interface_data_t rather than an actual array, but
// it does mean we have very clear separation between the threads.
for (int ii = 1; ii < vec_len (vac->vapi_itfs); ii++)
{
sflow_per_interface_data_t *sfif1 =
vec_elt_at_index (vac->vapi_itfs, ii);
sflow_per_interface_data_t *sfif2 = vec_elt_at_index (itfs, ii);
if (sfif1 && sfif2 && sfif1->sflow_enabled && sfif2->sflow_enabled)
sfif2->linux_if_index = sfif1->linux_if_index;
}
vec_free (vac->vapi_itfs);
vac->vapi_itfs = NULL;
return true;
}
return false;
}
#endif /* SFLOW_USE_VAPI */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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