/*
* 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
*
* If using an aux data vector - to hold bihash keys or some such:
*
* #define AUX_DATA_TYPE my_aux_data_t
*
* <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
/* Unless the user wants the aux data scheme, don't configure it */
#ifndef AUX_DATA_TYPE
#define AUX_DATA_ARG
#define AUX_DATA_DECL
#define AUX_DATA_PTR(pi)
#else
#define AUX_DATA_ARG ,##AUX_DATA_TYPE *ap
#define AUX_DATA_DECL AUX_DATA_TYPE aux_data[VLIB_FRAME_SIZE]
#define AUX_DATA_PTR(pi) ,aux_data +(pi)
#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
*
* This implementation won't use the aux data argument
*/
static STAGE_INLINE void
generic_stage0 (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_buffer_t * b AUX_DATA_ARG)
{
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;
u32 n_left_from;
int pi;
vlib_buffer_t *bufs[VLIB_FRAME_SIZE];
u16 nexts[VLIB_FRAME_SIZE];
AUX_DATA_DECL;
n_left_from = frame->n_vectors;
from = vlib_frame_vector_args (frame);
vlib_get_buffers (vm, from, bufs, n_left_from);
for (pi = 0; pi < NSTAGES - 1; pi++)
{
if (pi == n_left_from)
break;
stage0 (vm, node, bufs[pi] AUX_DATA_PTR (pi));
}
for (; pi < n_left_from; pi++)
{
stage0 (vm, node, bufs[pi]);
nexts[pi - 1] =
last_stage (vm, node, bufs[pi - 1] AUX_DATA_PTR (pi - 1));
}
for (; pi < (n_left_from + (NSTAGES - 1)); pi++)
{
if (((pi - 1) >= 0) && ((pi - 1) < n_left_from))
nexts[pi - 1] =
last_stage (vm, node, bufs[pi - 1] AUX_DATA_PTR (pi - 1));
}
vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
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;
u32 n_left_from;
int pi;
vlib_buffer_t *bufs[VLIB_FRAME_SIZE];
u16 nexts[VLIB_FRAME_SIZE];
AUX_DATA_DECL;
n_left_from = frame->n_vectors;
from = vlib_frame_vector_args (frame);
vlib_get_buffers (vm, from, bufs, n_left_from);
for (pi = 0; pi < NSTAGES - 1; pi++)
{
if (pi == n_left_from)
break;
stage0 (vm, node, bufs[pi] AUX_DATA_PTR (pi));
if (pi - 1 >= 0)
stage1 (vm, node, bufs[pi - 1]);
}
for (; pi < n_left_from; pi++)
{
stage0 (vm, node, bufs[pi] AUX_DATA_PTR (pi));
stage1 (vm, node, bufs[pi - 1] AUX_DATA_PTR (pi - 1));
nexts[pi - 2] =
last_stage (vm, node, bufs[pi - 2] AUX_DATA_PTR (pi - 2));
}
for (; pi < (n_left_from + (NSTAGES - 1)); pi++)
{
if (((pi - 1) >= 0) && ((pi - 1) < n_left_from))
stage1 (vm, node, bufs[pi - 1] AUX_DATA_PTR (pi - 1));
if (((pi - 2) >= 0) && ((pi - 2) < n_left_from))
nexts[pi - 2] =
last_stage (vm, node, bufs[pi - 2] AUX_DATA_PTR (pi - 2));
}
vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
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;
u32 n_left_from;
int pi;
vlib_buffer_t *bufs[VLIB_FRAME_SIZE];
u16 nexts[VLIB_FRAME_SIZE];
AUX_DATA_DECL;
n_left_from = frame->n_vectors;
from = vlib_frame_vector_args (frame);
vlib_get_buffers (vm, from, bufs, n_left_from);
for (pi = 0; pi < NSTAGES - 1; pi++)
{
if (pi == n_left_from)
break;
stage0 (vm, node, bufs[pi] AUX_DATA_PTR (pi));
if (pi - 1 >= 0)
stage1 (vm, node, bufs[pi - 1] AUX_DATA_PTR (pi - 1));
if (pi - 2 >= 0)
stage2 (vm, node, bufs[pi - 2] AUX_DATA_PTR (pi - 2));
}
for (; pi < n_left_from; pi++)
{
stage0 (vm, node, bufs[pi] AUX_DATA_PTR (pi));
stage1 (vm, node, bufs[pi - 1] AUX_DATA_PTR (pi - 1));
stage2 (vm, node, bufs[pi - 2] AUX_DATA_PTR (pi - 2));
nexts[pi - 3] =
last_stage (vm, node, bufs[pi - 3] AUX_DATA_PTR (pi - 3));
}
for (; pi < (n_left_from + (NSTAGES - 1)); pi++)
{
if (((pi - 1) >= 0) && ((pi - 1) < n_left_from))
stage1 (vm, node, bufs[pi - 1] AUX_DATA_PTR (pi - 1));
if (((pi - 2) >= 0) && ((pi - 2) < n_left_from))
stage2 (vm, node, bufs[pi - 2] AUX_DATA_PTR (pi - 2));
if (((pi - 3) >= 0) && ((pi - 3) < n_left_from))
nexts[pi - 3] =
last_stage (vm, node, bufs[pi - 3] AUX_DATA_PTR (pi - 3));
}
vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
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;
u32 n_left_from;
int pi;
vlib_buffer_t *bufs[VLIB_FRAME_SIZE];
u16 nexts[VLIB_FRAME_SIZE];
AUX_DATA_DECL;
n_left_from = frame->n_vectors;
from = vlib_frame_vector_args (frame);
vlib_get_buffers (vm, from, bufs, n_left_from);
for (pi = 0; pi < NSTAGES - 1; pi++)
{
if (pi == n_left_from)
break;
stage0 (vm, node, bufs[pi] AUX_DATA_PTR (pi));
if (pi - 1 >= 0)
stage1 (vm, node, bufs[pi - 1] AUX_DATA_PTR (pi - 1));
if (pi - 2 >= 0)
stage2 (vm, node, bufs[pi - 2] AUX_DATA_PTR (pi - 2));
if (pi - 3 >= 0)
stage3 (vm, node, bufs[pi - 3] AUX_DATA_PTR (pi - 3));
}
for (; pi < n_left_from; pi++)
{
stage0 (vm, node, bufs[pi] AUX_DATA_PTR (pi));
stage1 (vm, node, bufs[pi - 1] AUX_DATA_PTR (pi - 1));
stage2 (vm, node, bufs[pi - 2] AUX_DATA_PTR (pi - 2));
stage3 (vm, node, bufs[pi - 3] AUX_DATA_PTR (pi - 3));
nexts[pi - 4] =
last_stage (vm, node, bufs[pi - 4] AUX_DATA_PTR (pi - 4));
}
for (; pi < (n_left_from + (NSTAGES - 1)); pi++)
{
if (((pi - 1) >= 0) && ((pi - 1) < n_left_from))
stage1 (vm, node, bufs[pi - 1] AUX_DATA_PTR (pi - 1));
if (((pi - 2) >= 0) && ((pi - 2) < n_left_from))
stage2 (vm, node, bufs[pi - 2] AUX_DATA_PTR (pi - 2));
if (((pi - 3) >= 0) && ((pi - 3) < n_left_from))
stage3 (vm, node, bufs[pi - 3] AUX_DATA_PTR (pi - 3));
if (((pi - 4) >= 0) && ((pi - 4) < n_left_from))
nexts[pi - 4] =
last_stage (vm, node, bufs[pi - 4] AUX_DATA_PTR (pi - 4));
}
vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
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;
u32 n_left_from;
int pi;
vlib_buffer_t *bufs[VLIB_FRAME_SIZE];
u16 nexts[VLIB_FRAME_SIZE];
AUX_DATA_DECL;
n_left_from = frame->n_vectors;
from = vlib_frame_vector_args (frame);
vlib_get_buffers (vm, from, bufs, n_left_from);
for (pi = 0; pi < NSTAGES - 1; pi++)
{
if (pi == n_left_from)
break;
stage0 (vm, node, bufs[pi] AUX_DATA_PTR (pi));
if (pi - 1 >= 0)
stage1 (vm, node, bufs[pi - 1] AUX_DATA_PTR (pi - 1));
if (pi - 2 >= 0)
stage2 (vm, node, bufs[pi - 2] AUX_DATA_PTR (pi - 2));
if (pi - 3 >= 0)
stage3 (vm, node, bufs[pi - 3] AUX_DATA_PTR (pi - 3));
if (pi - 4 >= 0)
stage4 (vm, node, bufs[pi - 4] AUX_DATA_PTR (pi - 4));
}
for (; pi < n_left_from; pi++)
{
stage0 (vm, node, bufs[pi] AUX_DATA_PTR (pi));
stage1 (vm, node, bufs[pi - 1] AUX_DATA_PTR (pi - 1));
stage2 (vm, node, bufs[pi - 2] AUX_DATA_PTR (pi - 2));
stage3 (vm, node, bufs[pi - 3] AUX_DATA_PTR (pi - 3));
stage4 (vm, node, bufs[pi - 4] AUX_DATA_PTR (pi - 4));
nexts[pi - 5] =
last_stage (vm, node, bufs[pi - 5] AUX_DATA_PTR (pi - 5));
}
for (; pi < (n_left_from + (NSTAGES - 1)); pi++)
{
if (((pi - 1) >= 0) && ((pi - 1) < n_left_from))
stage1 (vm, node, bufs[pi - 1] AUX_DATA_PTR (pi - 1));
if (((pi - 2) >= 0) && ((pi - 2) < n_left_from))
stage2 (vm, node, bufs[pi - 2] AUX_DATA_PTR (pi - 2));
if (((pi - 3) >= 0) && ((pi - 3) < n_left_from))
stage3 (vm, node, bufs[pi - 3] AUX_DATA_PTR (pi - 3));
if (((pi - 4) >= 0) && ((pi - 4) < n_left_from))
stage4 (vm, node, bufs[pi - 4] AUX_DATA_PTR (pi - 4));
if (((pi - 5) >= 0) && ((pi - 5) < n_left_from))
nexts[pi - 5] =
last_stage (vm, node, bufs[pi - 5] AUX_DATA_PTR (pi - 5));
}
vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
return frame->n_vectors;
}
#endif
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
