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/*
* vnet/pipeline.h: software pipeline
*
* Copyright (c) 2012 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.
*/
/*
* Usage example.
*
* #define NSTAGES 3 or whatever
*
* <Define pipeline stages>
*
* #include <vnet/pipeline.h>
*
* static uword my_node_fn (vlib_main_t * vm,
* vlib_node_runtime_t * node,
* vlib_frame_t * frame)
* {
* return dispatch_pipeline (vm, node, frame);
* }
*
*/
#ifndef NSTAGES
#error files which #include <vnet/pipeline.h> must define NSTAGES
#endif
#ifndef STAGE_INLINE
#define STAGE_INLINE inline
#endif
/*
* A prefetch stride of 2 is quasi-equivalent to doubling the number
* of stages with every other pipeline stage empty.
*/
/*
* This is a typical first pipeline stage, which prefetches
* buffer metadata and the first line of pkt data.
* To use it:
* #define stage0 generic_stage0
*/
static STAGE_INLINE void
generic_stage0 (vlib_main_t * vm,
vlib_node_runtime_t * node, u32 buffer_index)
{
/* generic default stage 0 here */
vlib_buffer_t *b = vlib_get_buffer (vm, buffer_index);
vlib_prefetch_buffer_header (b, STORE);
CLIB_PREFETCH (b->data, CLIB_CACHE_LINE_BYTES, STORE);
}
#if NSTAGES == 2
static STAGE_INLINE uword
dispatch_pipeline (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
u32 *from = vlib_frame_vector_args (frame);
u32 n_left_from, n_left_to_next, *to_next, next_index, next0;
int pi, pi_limit;
n_left_from = frame->n_vectors;
next_index = node->cached_next_index;
while (n_left_from > 0)
{
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
pi_limit = clib_min (n_left_from, n_left_to_next);
for (pi = 0; pi < NSTAGES - 1; pi++)
{
if (pi == pi_limit)
break;
stage0 (vm, node, from[pi]);
}
for (; pi < pi_limit; pi++)
{
stage0 (vm, node, from[pi]);
to_next[0] = from[pi - 1];
to_next++;
n_left_to_next--;
next0 = last_stage (vm, node, from[pi - 1]);
vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
to_next, n_left_to_next,
from[pi - 1], next0);
n_left_from--;
if ((int) n_left_to_next < 0 && n_left_from > 0)
vlib_get_next_frame (vm, node, next_index, to_next,
n_left_to_next);
}
for (; pi < (pi_limit + (NSTAGES - 1)); pi++)
{
if (((pi - 1) >= 0) && ((pi - 1) < pi_limit))
{
to_next[0] = from[pi - 1];
to_next++;
n_left_to_next--;
next0 = last_stage (vm, node, from[pi - 1]);
vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
to_next, n_left_to_next,
from[pi - 1], next0);
n_left_from--;
if ((int) n_left_to_next < 0 && n_left_from > 0)
vlib_get_next_frame (vm, node, next_index, to_next,
n_left_to_next);
}
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
from += pi_limit;
}
return frame->n_vectors;
}
#endif
#if NSTAGES == 3
static STAGE_INLINE uword
dispatch_pipeline (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
u32 *from = vlib_frame_vector_args (frame);
u32 n_left_from, n_left_to_next, *to_next, next_index, next0;
int pi, pi_limit;
n_left_from = frame->n_vectors;
next_index = node->cached_next_index;
while (n_left_from > 0)
{
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
pi_limit = clib_min (n_left_from, n_left_to_next);
for (pi = 0; pi < NSTAGES - 1; pi++)
{
if (pi == pi_limit)
break;
stage0 (vm, node, from[pi]);
if (pi - 1 >= 0)
stage1 (vm, node, from[pi - 1]);
}
for (; pi < pi_limit; pi++)
{
stage0 (vm, node, from[pi]);
stage1 (vm, node, from[pi - 1]);
to_next[0] = from[pi - 2];
to_next++;
n_left_to_next--;
next0 = last_stage (vm, node, from[pi - 2]);
vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
to_next, n_left_to_next,
from[pi - 2], next0);
n_left_from--;
if ((int) n_left_to_next < 0 && n_left_from > 0)
vlib_get_next_frame (vm, node, next_index, to_next,
n_left_to_next);
}
for (; pi < (pi_limit + (NSTAGES - 1)); pi++)
{
if (((pi - 1) >= 0) && ((pi - 1) < pi_limit))
stage1 (vm, node, from[pi - 1]);
if (((pi - 2) >= 0) && ((pi - 2) < pi_limit))
{
to_next[0] = from[pi - 2];
to_next++;
n_left_to_next--;
next0 = last_stage (vm, node, from[pi - 2]);
vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
to_next, n_left_to_next,
from[pi - 2], next0);
n_left_from--;
if ((int) n_left_to_next < 0 && n_left_from > 0)
vlib_get_next_frame (vm, node, next_index, to_next,
n_left_to_next);
}
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
from += pi_limit;
}
return frame->n_vectors;
}
#endif
#if NSTAGES == 4
static STAGE_INLINE uword
dispatch_pipeline (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
u32 *from = vlib_frame_vector_args (frame);
u32 n_left_from, n_left_to_next, *to_next, next_index, next0;
int pi, pi_limit;
n_left_from = frame->n_vectors;
next_index = node->cached_next_index;
while (n_left_from > 0)
{
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
pi_limit = clib_min (n_left_from, n_left_to_next);
for (pi = 0; pi < NSTAGES - 1; pi++)
{
if (pi == pi_limit)
break;
stage0 (vm, node, from[pi]);
if (pi - 1 >= 0)
stage1 (vm, node, from[pi - 1]);
if (pi - 2 >= 0)
stage2 (vm, node, from[pi - 2]);
}
for (; pi < pi_limit; pi++)
{
stage0 (vm, node, from[pi]);
stage1 (vm, node, from[pi - 1]);
stage2 (vm, node, from[pi - 2]);
to_next[0] = from[pi - 3];
to_next++;
n_left_to_next--;
next0 = last_stage (vm, node, from[pi - 3]);
vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
to_next, n_left_to_next,
from[pi - 3], next0);
n_left_from--;
if ((int) n_left_to_next < 0 && n_left_from > 0)
vlib_get_next_frame (vm, node, next_index, to_next,
n_left_to_next);
}
for (; pi < (pi_limit + (NSTAGES - 1)); pi++)
{
if (((pi - 1) >= 0) && ((pi - 1) < pi_limit))
stage1 (vm, node, from[pi - 1]);
if (((pi - 2) >= 0) && ((pi - 2) < pi_limit))
stage2 (vm, node, from[pi - 2]);
if (((pi - 3) >= 0) && ((pi - 3) < pi_limit))
{
to_next[0] = from[pi - 3];
to_next++;
n_left_to_next--;
next0 = last_stage (vm, node, from[pi - 3]);
vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
to_next, n_left_to_next,
from[pi - 3], next0);
n_left_from--;
if ((int) n_left_to_next < 0 && n_left_from > 0)
vlib_get_next_frame (vm, node, next_index, to_next,
n_left_to_next);
}
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
from += pi_limit;
}
return frame->n_vectors;
}
#endif
#if NSTAGES == 5
static STAGE_INLINE uword
dispatch_pipeline (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
u32 *from = vlib_frame_vector_args (frame);
u32 n_left_from, n_left_to_next, *to_next, next_index, next0;
int pi, pi_limit;
n_left_from = frame->n_vectors;
next_index = node->cached_next_index;
while (n_left_from > 0)
{
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
pi_limit = clib_min (n_left_from, n_left_to_next);
for (pi = 0; pi < NSTAGES - 1; pi++)
{
if (pi == pi_limit)
break;
stage0 (vm, node, from[pi]);
if (pi - 1 >= 0)
stage1 (vm, node, from[pi - 1]);
if (pi - 2 >= 0)
stage2 (vm, node, from[pi - 2]);
if (pi - 3 >= 0)
stage3 (vm, node, from[pi - 3]);
}
for (; pi < pi_limit; pi++)
{
stage0 (vm, node, from[pi]);
stage1 (vm, node, from[pi - 1]);
stage2 (vm, node, from[pi - 2]);
stage3 (vm, node, from[pi - 3]);
to_next[0] = from[pi - 4];
to_next++;
n_left_to_next--;
next0 = last_stage (vm, node, from[pi - 4]);
vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
to_next, n_left_to_next,
from[pi - 4], next0);
n_left_from--;
if ((int) n_left_to_next < 0 && n_left_from > 0)
vlib_get_next_frame (vm, node, next_index, to_next,
n_left_to_next);
}
for (; pi < (pi_limit + (NSTAGES - 1)); pi++)
{
if (((pi - 1) >= 0) && ((pi - 1) < pi_limit))
stage1 (vm, node, from[pi - 1]);
if (((pi - 2) >= 0) && ((pi - 2) < pi_limit))
stage2 (vm, node, from[pi - 2]);
if (((pi - 3) >= 0) && ((pi - 3) < pi_limit))
stage3 (vm, node, from[pi - 3]);
if (((pi - 4) >= 0) && ((pi - 4) < pi_limit))
{
to_next[0] = from[pi - 4];
to_next++;
n_left_to_next--;
next0 = last_stage (vm, node, from[pi - 4]);
vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
to_next, n_left_to_next,
from[pi - 4], next0);
n_left_from--;
if ((int) n_left_to_next < 0 && n_left_from > 0)
vlib_get_next_frame (vm, node, next_index, to_next,
n_left_to_next);
}
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
from += pi_limit;
}
return frame->n_vectors;
}
#endif
#if NSTAGES == 6
static STAGE_INLINE uword
dispatch_pipeline (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
u32 *from = vlib_frame_vector_args (frame);
u32 n_left_from, n_left_to_next, *to_next, next_index, next0;
int pi, pi_limit;
n_left_from = frame->n_vectors;
next_index = node->cached_next_index;
while (n_left_from > 0)
{
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
pi_limit = clib_min (n_left_from, n_left_to_next);
for (pi = 0; pi < NSTAGES - 1; pi++)
{
if (pi == pi_limit)
break;
stage0 (vm, node, from[pi]);
if (pi - 1 >= 0)
stage1 (vm, node, from[pi - 1]);
if (pi - 2 >= 0)
stage2 (vm, node, from[pi - 2]);
if (pi - 3 >= 0)
stage3 (vm, node, from[pi - 3]);
if (pi - 4 >= 0)
stage4 (vm, node, from[pi - 4]);
}
for (; pi < pi_limit; pi++)
{
stage0 (vm, node, from[pi]);
stage1 (vm, node, from[pi - 1]);
stage2 (vm, node, from[pi - 2]);
stage3 (vm, node, from[pi - 3]);
stage4 (vm, node, from[pi - 4]);
to_next[0] = from[pi - 5];
to_next++;
n_left_to_next--;
next0 = last_stage (vm, node, from[pi - 5]);
vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
to_next, n_left_to_next,
from[pi - 5], next0);
n_left_from--;
if ((int) n_left_to_next < 0 && n_left_from > 0)
vlib_get_next_frame (vm, node, next_index, to_next,
n_left_to_next);
}
for (; pi < (pi_limit + (NSTAGES - 1)); pi++)
{
if (((pi - 1) >= 0) && ((pi - 1) < pi_limit))
stage1 (vm, node, from[pi - 1]);
if (((pi - 2) >= 0) && ((pi - 2) < pi_limit))
stage2 (vm, node, from[pi - 2]);
if (((pi - 3) >= 0) && ((pi - 3) < pi_limit))
stage3 (vm, node, from[pi - 3]);
if (((pi - 4) >= 0) && ((pi - 4) < pi_limit))
stage4 (vm, node, from[pi - 4]);
if (((pi - 5) >= 0) && ((pi - 5) < pi_limit))
{
to_next[0] = from[pi - 5];
to_next++;
n_left_to_next--;
next0 = last_stage (vm, node, from[pi - 5]);
vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
to_next, n_left_to_next,
from[pi - 5], next0);
n_left_from--;
if ((int) n_left_to_next < 0 && n_left_from > 0)
vlib_get_next_frame (vm, node, next_index, to_next,
n_left_to_next);
}
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
from += pi_limit;
}
return frame->n_vectors;
}
#endif
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
|
