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/*
* l2_output.h : layer 2 output packet 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.
*/
#ifndef included_vnet_l2_output_h
#define included_vnet_l2_output_h
#include <vlib/vlib.h>
#include <vnet/vnet.h>
#include <vnet/l2/feat_bitmap.h>
#include <vnet/l2/l2_vtr.h>
// The L2 output feature configuration, a per-interface struct
typedef struct {
u32 feature_bitmap;
// vlan tag rewrite for ingress and egress
// ingress vtr is located here because the same config data is used for
// the egress EFP filter check
vtr_config_t input_vtr;
vtr_config_t output_vtr;
// some of these flags may get integrated into the feature bitmap
u8 fwd_enable;
u8 flood_enable;
// split horizon group
u8 shg;
} l2_output_config_t;
// The set of next nodes for features and interface output.
// Each output feature node should include this.
typedef struct {
// vector of output next node index, indexed by sw_if_index.
// used when all output features have been executed and the
// next nodes are the interface output nodes.
u32 * output_node_index_vec;
// array of next node index for each output feature, indexed
// by l2output_feat_t. Used to determine next feature node.
u32 feat_next_node_index[32];
} l2_output_next_nodes_st;
typedef struct {
// Next nodes for features and output interfaces
l2_output_next_nodes_st next_nodes;
/* config vector indexed by sw_if_index */
l2_output_config_t *configs;
/* Convenience variables */
vlib_main_t * vlib_main;
vnet_main_t * vnet_main;
} l2output_main_t;
l2output_main_t l2output_main;
vlib_node_registration_t l2output_node;
// L2 output features
// Mappings from feature ID to graph node name
#define foreach_l2output_feat \
_(SPAN, "feature-bitmap-drop") \
_(CFM, "feature-bitmap-drop") \
_(QOS, "feature-bitmap-drop") \
_(ACL, "l2-output-acl") \
_(L2PT, "feature-bitmap-drop") \
_(EFP_FILTER, "l2-efp-filter") \
_(IPIW, "feature-bitmap-drop") \
_(STP_BLOCKED, "feature-bitmap-drop") \
_(LINESTATUS_DOWN, "feature-bitmap-drop") \
_(XCRW, "l2-xcrw")
// Feature bitmap positions
typedef enum {
#define _(sym,str) L2OUTPUT_FEAT_##sym##_BIT,
foreach_l2output_feat
#undef _
L2OUTPUT_N_FEAT,
} l2output_feat_t;
// Feature bit masks
typedef enum {
#define _(sym,str) L2OUTPUT_FEAT_##sym = (1<<L2OUTPUT_FEAT_##sym##_BIT),
foreach_l2output_feat
#undef _
} l2output_feat_masks_t;
// Return an array of strings containing graph node names of each feature
char **l2output_get_feat_names(void);
// The next set of functions is for use by output feature graph nodes.
// When the last bit has been cleared from the output feature bitmap,
// the next node is the output graph node for the TX sw_if_index.
// These functions help the feature nodes get that node index.
// Create a mapping to the output graph node for the given sw_if_index
u32 l2output_create_output_node_mapping (
vlib_main_t * vlib_main,
vnet_main_t * vnet_main,
u32 node_index, // index of current node
u32 * output_node_index_vec,
u32 sw_if_index);
// Initialize the next node mapping table
always_inline
void l2output_init_output_node_vec (u32 **output_node_index_vec) {
// Size it at 100 sw_if_indexes initially
// Uninitialized mappings are set to ~0
vec_validate_init_empty(*output_node_index_vec, 100, ~0);
}
// Get a mapping from the output node mapping table,
// creating the entry if necessary.
always_inline
u32 l2output_get_output_node (vlib_main_t * vlib_main,
vnet_main_t * vnet_main,
u32 node_index, // index of current node
u32 sw_if_index,
u32 ** output_node_index_vec) // may be updated
{
u32 next; // index of next graph node
// Insure the vector is big enough
vec_validate_init_empty(*output_node_index_vec, sw_if_index, ~0);
// Get the mapping for the sw_if_index
next = vec_elt(*output_node_index_vec, sw_if_index);
if (next == ~0) {
// Mapping doesn't exist so create it
next = l2output_create_output_node_mapping (vlib_main,
vnet_main,
node_index,
*output_node_index_vec,
sw_if_index);
}
return next;
}
// Determine the next L2 node based on the output feature bitmap
always_inline void
l2_output_dispatch (vlib_main_t * vlib_main,
vnet_main_t * vnet_main,
vlib_node_runtime_t * node,
u32 node_index,
u32 * cached_sw_if_index,
u32 * cached_next_index,
l2_output_next_nodes_st *next_nodes,
vlib_buffer_t * b0,
u32 sw_if_index,
u32 feature_bitmap,
u32 *next0)
{
if (feature_bitmap) {
// There are some features to execute
// Save bitmap for the next feature graph nodes
vnet_buffer(b0)->l2.feature_bitmap = feature_bitmap;
// Determine the next node
*next0 = feat_bitmap_get_next_node_index(next_nodes->feat_next_node_index,
feature_bitmap);
} else {
// There are no features. Send packet to TX node for sw_if_index0
// This is a little tricky in that the output interface next node indexes
// are not precomputed at init time.
if (sw_if_index == *cached_sw_if_index) {
// We hit in the one-entry cache. Use it.
*next0 = *cached_next_index;
} else {
// Look up the output TX node
*next0 = l2output_get_output_node(vlib_main,
vnet_main,
node_index,
sw_if_index,
&next_nodes->output_node_index_vec);
// Update the one-entry cache
*cached_sw_if_index = sw_if_index;
*cached_next_index = *next0;
}
}
}
// Get a pointer to the config for the given interface
l2_output_config_t * l2output_intf_config (u32 sw_if_index);
// Enable (or disable) the feature in the bitmap for the given interface
void l2output_intf_bitmap_enable (u32 sw_if_index,
u32 feature_bitmap,
u32 enable);
#endif
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