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/*
* nsim.c - skeleton vpp engine plug-in
*
* 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 expired;
u32 next_index;
} nsim_tx_trace_t;
#ifndef CLIB_MARCH_VARIANT
/* packet trace format function */
static u8 *
format_nsim_tx_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_tx_trace_t *t = va_arg (*args, nsim_tx_trace_t *);
s = format (s, "NSIM: tx at %.6f next_index %d", t->expired, t->next_index);
return s;
}
#endif /* CLIB_MARCH_VARIANT */
#define foreach_nsim_tx_error \
_(TRANSMITTED, "Packets transmitted")
typedef enum
{
#define _(sym,str) NSIM_TX_ERROR_##sym,
foreach_nsim_tx_error
#undef _
NSIM_TX_N_ERROR,
} nsim_tx_error_t;
#ifndef CLIB_MARCH_VARIANT
static char *nsim_tx_error_strings[] = {
#define _(sym,string) string,
foreach_nsim_tx_error
#undef _
};
#endif /* CLIB_MARCH_VARIANT */
typedef enum
{
NSIM_NEXT_DROP,
NSIM_N_NEXT,
} nsim_next_t;
always_inline uword
nsim_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
vlib_frame_t * f, int is_trace)
{
nsim_main_t *nsm = &nsim_main;
u32 my_thread_index = vm->thread_index;
nsim_wheel_t *wp = nsm->wheel_by_thread[my_thread_index];
f64 now = vlib_time_now (vm);
uword n_tx_packets = 0;
u32 bi0, next0;
u32 *to_next;
u32 next_index;
u32 n_left_to_next;
nsim_wheel_entry_t *ep;
/* Nothing on the scheduler wheel? */
if (wp->cursize == 0)
return 0;
/* First entry on the wheel isn't expired? */
ep = wp->entries + wp->head;
if (ep->tx_time > now)
return n_tx_packets;
next_index = node->cached_next_index;
/* Be aware: this is not the usual coding pattern */
while (wp->cursize && ep->tx_time <= now)
{
vlib_buffer_t *b0;
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (n_left_to_next > 0)
{
/* prefetch one line / 2 entries ahead */
if ((((uword) ep) & (CLIB_CACHE_LINE_BYTES - 1)) == 0)
CLIB_PREFETCH ((ep + 2), CLIB_CACHE_LINE_BYTES, LOAD);
/* Pick up buffer from the wheel */
bi0 = ep->buffer_index;
to_next[0] = bi0;
to_next += 1;
n_left_to_next -= 1;
next0 = ep->output_next_index;
/* verify speculative enqueue, maybe switch current next frame */
vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
to_next, n_left_to_next,
bi0, next0);
/* Advance to the next ring entry */
wp->head++;
if (wp->head == wp->wheel_size)
wp->head = 0;
wp->cursize--;
ep = wp->entries + wp->head;
n_tx_packets++;
if (is_trace)
{
b0 = vlib_get_buffer (vm, bi0);
if (b0->flags & VLIB_BUFFER_IS_TRACED)
{
nsim_tx_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
t->expired = now;
t->next_index = next0;
}
}
/* Out of ring entries? */
if (PREDICT_FALSE (wp->cursize == 0))
break;
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
/* If the current entry hasn't expired, we're done */
if (ep->tx_time > now)
break;
}
vlib_node_increment_counter (vm, node->node_index,
NSIM_TX_ERROR_TRANSMITTED, n_tx_packets);
return n_tx_packets;
}
VLIB_NODE_FN (nsim_input_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_input_inline (vm, node, frame, 1 /* is_trace */ );
else
return nsim_input_inline (vm, node, frame, 0 /* is_trace */ );
}
/* *INDENT-OFF* */
#ifndef CLIB_MARCH_VARIANT
VLIB_REGISTER_NODE (nsim_input_node) =
{
.type = VLIB_NODE_TYPE_INPUT,
.name = "nsim-wheel",
/* Will be enabled if/when the feature is configured */
.state = VLIB_NODE_STATE_DISABLED,
.format_trace = format_nsim_tx_trace,
.n_errors = NSIM_TX_N_ERROR,
.error_strings = nsim_tx_error_strings,
};
#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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