/*
* l2_input_vtr.c : layer 2 input vlan tag rewrite processing
*
* Copyright (c) 2013 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.
*/
#include <vlib/vlib.h>
#include <vnet/vnet.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/ethernet/packet.h>
#include <vnet/l2/l2_input.h>
#include <vnet/l2/feat_bitmap.h>
#include <vnet/l2/l2_vtr.h>
#include <vnet/l2/l2_input_vtr.h>
#include <vnet/l2/l2_output.h>
#include <vppinfra/error.h>
#include <vppinfra/cache.h>
typedef struct
{
/* per-pkt trace data */
u8 src[6];
u8 dst[6];
u8 raw[12]; /* raw data (vlans) */
u32 sw_if_index;
} l2_invtr_trace_t;
/* packet trace format function */
static u8 *
format_l2_invtr_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 *);
l2_invtr_trace_t *t = va_arg (*args, l2_invtr_trace_t *);
s = format (s, "l2-input-vtr: sw_if_index %d dst %U src %U data "
"%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
t->sw_if_index,
format_ethernet_address, t->dst,
format_ethernet_address, t->src,
t->raw[0], t->raw[1], t->raw[2], t->raw[3], t->raw[4],
t->raw[5], t->raw[6], t->raw[7], t->raw[8], t->raw[9],
t->raw[10], t->raw[11]);
return s;
}
l2_invtr_main_t l2_invtr_main;
static vlib_node_registration_t l2_invtr_node;
#define foreach_l2_invtr_error \
_(L2_INVTR, "L2 inverter packets") \
_(DROP, "L2 input tag rewrite drops")
typedef enum
{
#define _(sym,str) L2_INVTR_ERROR_##sym,
foreach_l2_invtr_error
#undef _
L2_INVTR_N_ERROR,
} l2_invtr_error_t;
static char *l2_invtr_error_strings[] = {
#define _(sym,string) string,
foreach_l2_invtr_error
#undef _
};
typedef enum
{
L2_INVTR_NEXT_DROP,
L2_INVTR_N_NEXT,
} l2_invtr_next_t;
static uword
l2_invtr_node_fn (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
u32 n_left_from, *from, *to_next;
l2_invtr_next_t next_index;
l2_invtr_main_t *msm = &l2_invtr_main;
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors; /* number of packets to process */
next_index = node->cached_next_index;
while (n_left_from > 0)
{
u32 n_left_to_next;
/* get space to enqueue frame to graph node "next_index" */
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (n_left_from >= 6 && n_left_to_next >= 2)
{
u32 bi0, bi1;
vlib_buffer_t *b0, *b1;
u32 next0, next1;
u32 sw_if_index0, sw_if_index1;
/* Prefetch next iteration. */
{
vlib_buffer_t *p2, *p3, *p4, *p5;
u32 sw_if_index2, sw_if_index3;
p2 = vlib_get_buffer (vm, from[2]);
p3 = vlib_get_buffer (vm, from[3]);
p4 = vlib_get_buffer (vm, from[4]);
p5 = vlib_get_buffer (vm, from[5]);
/* Prefetch the buffer header and packet for the N+2 loop iteration */
vlib_prefetch_buffer_header (p4, LOAD);
vlib_prefetch_buffer_header (p5, LOAD);
CLIB_PREFETCH (p4->data, CLIB_CACHE_LINE_BYTES, STORE);
CLIB_PREFETCH (p5->data, CLIB_CACHE_LINE_BYTES, STORE);
/*
* Prefetch the input config for the N+1 loop iteration
* This depends on the buffer header above
*/
sw_if_index2 = vnet_buffer (p2)->sw_if_index[VLIB_RX];
sw_if_index3 = vnet_buffer (p3)->sw_if_index[VLIB_RX];
CLIB_PREFETCH (vec_elt_at_index
(l2output_main.configs, sw_if_index2),
CLIB_CACHE_LINE_BYTES, LOAD);
CLIB_PREFETCH (vec_elt_at_index
(l2output_main.configs, sw_if_index3),
CLIB_CACHE_LINE_BYTES, LOAD);
}
/* speculatively enqueue b0 and b1 to the current next frame */
/* bi is "buffer index", b is pointer to the buffer */
to_next[0] = bi0 = from[0];
to_next[1] = bi1 = from[1];
from += 2;
to_next += 2;
n_left_from -= 2;
n_left_to_next -= 2;
b0 = vlib_get_buffer (vm, bi0);
b1 = vlib_get_buffer (vm, bi1);
/* RX interface handles */
sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
/* Determine the next node */
next0 = vnet_l2_feature_next (b0, msm->feat_next_node_index,
L2INPUT_FEAT_VTR);
next1 = vnet_l2_feature_next (b1, msm->feat_next_node_index,
L2INPUT_FEAT_VTR);
l2_output_config_t *config0;
l2_output_config_t *config1;
config0 = vec_elt_at_index (l2output_main.configs, sw_if_index0);
config1 = vec_elt_at_index (l2output_main.configs, sw_if_index1);
if (PREDICT_FALSE (config0->out_vtr_flag))
{
if (config0->output_vtr.push_and_pop_bytes)
{
/* perform the tag rewrite on two packets */
if (l2_vtr_process (b0, &config0->input_vtr))
{
/* Drop packet */
next0 = L2_INVTR_NEXT_DROP;
b0->error = node->errors[L2_INVTR_ERROR_DROP];
}
}
else if (config0->output_pbb_vtr.push_and_pop_bytes)
{
if (l2_pbb_process (b0, &(config0->input_pbb_vtr)))
{
/* Drop packet */
next0 = L2_INVTR_NEXT_DROP;
b0->error = node->errors[L2_INVTR_ERROR_DROP];
}
}
}
if (PREDICT_FALSE (config1->out_vtr_flag))
{
if (config1->output_vtr.push_and_pop_bytes)
{
if (l2_vtr_process (b1, &config1->input_vtr))
{
/* Drop packet */
next1 = L2_INVTR_NEXT_DROP;
b1->error = node->errors[L2_INVTR_ERROR_DROP];
}
}
else if (config1->output_pbb_vtr.push_and_pop_bytes)
{
if (l2_pbb_process (b1, &(config1->input_pbb_vtr)))
{
/* Drop packet */
next1 = L2_INVTR_NEXT_DROP;
b1->error = node->errors[L2_INVTR_ERROR_DROP];
}
}
}
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
{
if (b0->flags & VLIB_BUFFER_IS_TRACED)
{
l2_invtr_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
ethernet_header_t *h0 = vlib_buffer_get_current (b0);
t->sw_if_index = sw_if_index0;
clib_memcpy (t->src, h0->src_address, 6);
clib_memcpy (t->dst, h0->dst_address, 6);
clib_memcpy (t->raw, &h0->type, sizeof (t->raw));
}
if (b1->flags & VLIB_BUFFER_IS_TRACED)
{
l2_invtr_trace_t *t =
vlib_add_trace (vm, node, b1, sizeof (*t));
ethernet_header_t *h1 = vlib_buffer_get_current (b1);
t->sw_if_index = sw_if_index0;
clib_memcpy (t->src, h1->src_address, 6);
clib_memcpy (t->dst, h1->dst_address, 6);
clib_memcpy (t->raw, &h1->type, sizeof (t->raw));
}
}
/* verify speculative enqueues, maybe switch current next frame */
/* if next0==next1==next_index then nothing special needs to be done */
vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
to_next, n_left_to_next,
bi0, bi1, next0, next1);
}
while (n_left_from > 0 && n_left_to_next > 0)
{
u32 bi0;
vlib_buffer_t *b0;
u32 next0;
u32 sw_if_index0;
/* speculatively enqueue b0 to the current next frame */
bi0 = from[0];
to_next[0] = bi0;
from += 1;
to_next += 1;
n_left_from -= 1;
n_left_to_next -= 1;
b0 = vlib_get_buffer (vm, bi0);
sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
/* Determine the next node */
next0 = vnet_l2_feature_next (b0, msm->feat_next_node_index,
L2INPUT_FEAT_VTR);
l2_output_config_t *config0;
config0 = vec_elt_at_index (l2output_main.configs, sw_if_index0);
if (PREDICT_FALSE (config0->out_vtr_flag))
{
if (config0->output_vtr.push_and_pop_bytes)
{
/* perform the tag rewrite on one packet */
if (l2_vtr_process (b0, &config0->input_vtr))
{
/* Drop packet */
next0 = L2_INVTR_NEXT_DROP;
b0->error = node->errors[L2_INVTR_ERROR_DROP];
}
}
else if (config0->output_pbb_vtr.push_and_pop_bytes)
{
if (l2_pbb_process (b0, &(config0->input_pbb_vtr)))
{
/* Drop packet */
next0 = L2_INVTR_NEXT_DROP;
b0->error = node->errors[L2_INVTR_ERROR_DROP];
}
}
}
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
&& (b0->flags & VLIB_BUFFER_IS_TRACED)))
{
l2_invtr_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
ethernet_header_t *h0 = vlib_buffer_get_current (b0);
t->sw_if_index = sw_if_index0;
clib_memcpy (t->src, h0->src_address, 6);
clib_memcpy (t->dst, h0->dst_address, 6);
clib_memcpy (t->raw, &h0->type, sizeof (t->raw));
}
/* 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);
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
return frame->n_vectors;
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (l2_invtr_node,static) = {
.function = l2_invtr_node_fn,
.name = "l2-input-vtr",
.vector_size = sizeof (u32),
.format_trace = format_l2_invtr_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(l2_invtr_error_strings),
.error_strings = l2_invtr_error_strings,
.n_next_nodes = L2_INVTR_N_NEXT,
/* edit / add dispositions here */
.next_nodes = {
[L2_INVTR_NEXT_DROP] = "error-drop",
},
};
/* *INDENT-ON* */
VLIB_NODE_FUNCTION_MULTIARCH (l2_invtr_node, l2_invtr_node_fn)
clib_error_t *l2_invtr_init (vlib_main_t * vm)
{
l2_invtr_main_t *mp = &l2_invtr_main;
mp->vlib_main = vm;
mp->vnet_main = vnet_get_main ();
/* Initialize the feature next-node indexes */
feat_bitmap_init_next_nodes (vm,
l2_invtr_node.index,
L2INPUT_N_FEAT,
l2input_get_feat_names (),
mp->feat_next_node_index);
return 0;
}
VLIB_INIT_FUNCTION (l2_invtr_init);
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
