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/*
* replication.h : packet replication
*
* 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_replication_h
#define included_replication_h
#include <vlib/vlib.h>
#include <vnet/vnet.h>
#include <vnet/replication.h>
typedef struct
{
/* The entire vnet buffer header restored for each replica */
u8 vnet_buffer[40]; /* 16B aligned to allow vector unit copy */
u8 reserved[24]; /* space for future expansion of vnet buffer header */
/* feature state used during this replication */
u64 feature_replicas; /* feature's id for its set of replicas */
u32 feature_counter; /* feature's current index into set of replicas */
u32 recycle_node_index; /* feature's recycle node index */
/*
* data saved from the start of replication and restored
* at the end of replication
*/
vlib_buffer_free_list_index_t saved_free_list_index; /* from vlib buffer */
/* data saved from the original packet and restored for each replica */
u64 l2_header[3]; /* 24B (must be at least 22B for l2 packets) */
u32 flags; /* vnet buffer flags */
u16 ip_tos; /* v4 and v6 */
u16 ip4_checksum; /* needed for v4 only */
/* data saved from the vlib buffer header and restored for each replica */
i16 current_data; /* offset of first byte of packet in packet data */
u8 pad[2]; /* to 64B */
u8 l2_packet; /* flag for l2 vs l3 packet data */
} replication_context_t; /* 128B */
typedef struct
{
u32 recycle_list_index;
/* per-thread pools of replication contexts */
replication_context_t **contexts;
vlib_main_t *vlib_main;
vnet_main_t *vnet_main;
} replication_main_t;
extern replication_main_t replication_main;
/* Return 1 if this buffer just came from the replication recycle handler. */
always_inline u32
replication_is_recycled (vlib_buffer_t * b0)
{
return b0->flags & VLIB_BUFFER_IS_RECYCLED;
}
/*
* Clear the recycle flag. If buffer came from the replication recycle
* handler, this flag must be cleared before the packet is transmitted again.
*/
always_inline void
replication_clear_recycled (vlib_buffer_t * b0)
{
b0->flags &= ~VLIB_BUFFER_IS_RECYCLED;
}
/*
* Return the active replication context if this buffer has
* been recycled, otherwise return 0. (Note that this essentially
* restricts access to the replication context to the replication
* feature's prep and recycle nodes.)
*/
always_inline replication_context_t *
replication_get_ctx (vlib_buffer_t * b0)
{
replication_main_t *rm = &replication_main;
return replication_is_recycled (b0) ?
pool_elt_at_index (rm->contexts[vlib_get_thread_index ()],
b0->recycle_count) :
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