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/*
* handoff_trace.c - used to generate handoff trace records
*
* Copyright (c) 2019 Cisco Systems 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 <vlib/vlib.h>
#include <vnet/vnet.h>
#include <vnet/pg/pg.h>
#include <vppinfra/error.h>
typedef struct
{
u32 prev_thread;
u32 prev_trace_index;
} handoff_trace_t;
/* packet trace format function */
static u8 *
format_handoff_trace (u8 * s, va_list * args)
{
CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
handoff_trace_t *t = va_arg (*args, handoff_trace_t *);
s = format (s, "HANDED-OFF: from thread %d trace index %d",
t->prev_thread, t->prev_trace_index);
return s;
}
static vlib_node_registration_t handoff_trace_node;
#define foreach_handoff_trace_error \
_(BUGS, "Warning: packets sent to the handoff trace node!")
typedef enum
{
#define _(sym,str) HANDOFF_TRACE_ERROR_##sym,
foreach_handoff_trace_error
#undef _
HANDOFF_TRACE_N_ERROR,
} handoff_trace_error_t;
static char *handoff_trace_error_strings[] = {
#define _(sym,string) string,
foreach_handoff_trace_error
#undef _
};
static uword
handoff_trace_node_fn (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
vlib_buffer_free (vm, vlib_frame_vector_args (frame), frame->n_vectors);
vlib_node_increment_counter (vm, node->node_index,
HANDOFF_TRACE_ERROR_BUGS, frame->n_vectors);
return frame->n_vectors;
}
typedef enum
{
HANDOFF_TRACE_NEXT_DROP,
HANDOFF_TRACE_N_NEXT,
} tplaceholder_next_t;
VLIB_REGISTER_NODE (handoff_trace_node, static) =
{
.name = "handoff_trace",
.flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
.function = handoff_trace_node_fn,
.vector_size = sizeof (u32),
.format_trace = format_handoff_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_next_nodes = HANDOFF_TRACE_N_NEXT,
/* edit / add dispositions here */
.next_nodes = {
[HANDOFF_TRACE_NEXT_DROP] = "error-drop",
},
.n_errors = ARRAY_LEN(handoff_trace_error_strings),
.error_strings = handoff_trace_error_strings,
};
int
vlib_add_handoff_trace (vlib_main_t * vm, vlib_buffer_t * b)
{
u32 prev_thread = vlib_buffer_get_trace_thread (b);
u32 prev_trace_index = vlib_buffer_get_trace_index (b);
handoff_trace_t *t;
vlib_node_runtime_t *node
= vlib_node_get_runtime (vm, handoff_trace_node.index);
if (PREDICT_FALSE
(!vlib_trace_buffer
(vm, node, 0 /* fake next frame index */ , b, 1 /* follow chain */ )))
return 0;
t = vlib_add_trace (vm, node, b, sizeof (*t));
t->prev_thread = prev_thread;
t->prev_trace_index = prev_trace_index;
return 1;
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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