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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;
ptr_config_t input_pbb_vtr;
ptr_config_t output_pbb_vtr;
/* some of these flags may get integrated into the feature bitmap */
u8 fwd_enable;
u8 flood_enable;
/* split horizon group */
u8 shg;
/* flag for output vtr operation */
u8 out_vtr_flag;
} 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;
/* L2 output features */
/* Mappings from feature ID to graph node name */
#define foreach_l2output_feat \
_(OUTPUT, "interface-output") \
_(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") \
_(OUTPUT_CLASSIFY, "l2-output-classify") \
_(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;
#define foreach_l2output_error \
_(L2OUTPUT, "L2 output packets") \
_(EFP_DROP, "L2 EFP filter pre-rewrite drops") \
_(VTR_DROP, "L2 output tag rewrite drops") \
_(SHG_DROP, "L2 split horizon drops") \
_(DROP, "L2 output drops") \
_(MAPPING_DROP, "L2 Output interface not valid")
typedef enum
{
L2OUTPUT_NEXT_DROP,
L2OUTPUT_NEXT_BAD_INTF,
L2OUTPUT_N_NEXT,
} l2output_next_t;
typedef enum
{
#define _(sym,str) L2OUTPUT_ERROR_##sym,
foreach_l2output_error
#undef _
L2OUTPUT_N_ERROR,
} l2output_error_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 */
void l2output_create_output_node_mapping (vlib_main_t * vlib_main,
vnet_main_t * vnet_main,
u32 sw_if_index);
/** 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)
{
/*
* The output feature bitmap always have at least the output feature bit set
* for a normal L2 interface (or all 0's if the interface is changed from L2
* to L3 mode). So if next_nodes specified is that from the l2-output node and
* the bitmap is all clear except output feature bit, we know there is no more
* feature and will fall through to output packet. If next_nodes is from a L2
* output feature node (and not l2-output), we always want to get the node for
* the next L2 output feature, including the last feature being interface-
* output node to output packet.
*/
if ((next_nodes != &l2output_main.next_nodes)
|| ((feature_bitmap & ~L2OUTPUT_FEAT_OUTPUT) != 0))
{
/* There are some features to execute */
ASSERT (feature_bitmap != 0);
/* 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 for the sw_if_index */
*next0 = vec_elt (l2output_main.next_nodes.output_node_index_vec,
sw_if_index);
if (*next0 == L2OUTPUT_NEXT_DROP)
b0->error = node->errors[L2OUTPUT_ERROR_MAPPING_DROP];
/* 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
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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