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/*
* node.c - skeleton vpp engine plug-in dual-loop node skeleton
*
* Copyright (c) <current-year> <your-organization>
* 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>
#include <nsim/nsim.h>
typedef struct
{
f64 expires;
u32 tx_sw_if_index;
int is_drop;
} nsim_trace_t;
#ifndef CLIB_MARCH_VARIANT
/* packet trace format function */
static u8 *
format_nsim_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 *);
nsim_trace_t *t = va_arg (*args, nsim_trace_t *);
if (t->is_drop)
s = format (s, "NSIM: ring drop");
else
s = format (s, "NSIM: tx time %.6f sw_if_index %d",
t->expires, t->tx_sw_if_index);
return s;
}
vlib_node_registration_t nsim_node;
#endif /* CLIB_MARCH_VARIANT */
#define foreach_nsim_error \
_(BUFFERED, "Packets buffered") \
_(DROPPED, "Packets dropped due to lack of space")
typedef enum
{
#define _(sym,str) NSIM_ERROR_##sym,
foreach_nsim_error
#undef _
NSIM_N_ERROR,
} nsim_error_t;
#ifndef CLIB_MARCH_VARIANT
static char *nsim_error_strings[] = {
#define _(sym,string) string,
foreach_nsim_error
#undef _
};
#endif /* CLIB_MARCH_VARIANT */
typedef enum
{
NSIM_NEXT_DROP,
NSIM_N_NEXT,
} nsim_next_t;
always_inline uword
nsim_inline (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame, int is_trace)
{
nsim_main_t *nsm = &nsim_main;
u32 n_left_from, *from;
vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
u16 nexts[VLIB_FRAME_SIZE], *next;
u32 my_thread_index = vm->thread_index;
nsim_wheel_t *wp = nsm->wheel_by_thread[my_thread_index];
f64 now = vlib_time_now (vm);
f64 expires = now + nsm->delay;
int is_drop0;
u32 no_error = node->errors[NSIM_ERROR_BUFFERED];
u32 no_buffer_error = node->errors[NSIM_ERROR_DROPPED];
nsim_wheel_entry_t *ep = 0;
ASSERT (wp);
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
vlib_get_buffers (vm, from, bufs, n_left_from);
b = bufs;
next = nexts;
/* There is no point in trying to do more than 1 pkt here */
while (n_left_from > 0)
{
b[0]->error = no_error;
next[0] = NSIM_NEXT_DROP;
is_drop0 = 0;
if (PREDICT_TRUE (wp->cursize < wp->wheel_size))
{
ep = wp->entries + wp->tail;
wp->tail++;
if (wp->tail == wp->wheel_size)
wp->tail = 0;
wp->cursize++;
ep->tx_time = expires;
ep->tx_sw_if_index =
(vnet_buffer (b[0])->sw_if_index[VLIB_RX] == nsm->sw_if_index0)
? nsm->sw_if_index1 : nsm->sw_if_index0;
ep->current_length = vlib_buffer_length_in_chain (vm, b[0]);
ASSERT (ep->current_length <= WHEEL_ENTRY_DATA_SIZE);
clib_memcpy (ep->data, vlib_buffer_get_current (b[0]),
ep->current_length);
}
else /* out of wheel space, drop pkt */
{
b[0]->error = no_buffer_error;
is_drop0 = 1;
}
if (is_trace)
{
if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
{
nsim_trace_t *t = vlib_add_trace (vm, node, b[0], sizeof (*t));
t->expires = expires;
t->is_drop = is_drop0;
t->tx_sw_if_index = (is_drop0 == 0) ? ep->tx_sw_if_index : 0;
}
}
b += 1;
next += 1;
n_left_from -= 1;
}
vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
return frame->n_vectors;
}
VLIB_NODE_FN (nsim_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
return nsim_inline (vm, node, frame, 1 /* is_trace */ );
else
return nsim_inline (vm, node, frame, 0 /* is_trace */ );
}
/* *INDENT-OFF* */
#ifndef CLIB_MARCH_VARIANT
VLIB_REGISTER_NODE (nsim_node) =
{
.name = "nsim",
.vector_size = sizeof (u32),
.format_trace = format_nsim_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(nsim_error_strings),
.error_strings = nsim_error_strings,
.n_next_nodes = NSIM_N_NEXT,
/* edit / add dispositions here */
.next_nodes = {
[NSIM_NEXT_DROP] = "error-drop",
},
};
#endif /* CLIB_MARCH_VARIANT */
/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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