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* replication.c : 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.
*/
#include <vlib/vlib.h>
#include <vnet/vnet.h>
#include <vppinfra/error.h>
#include <vnet/ip/ip4_packet.h>
#include <vnet/replication.h>
replication_main_t replication_main;
replication_context_t *
replication_prep (vlib_main_t * vm,
vlib_buffer_t * b0, u32 recycle_node_index, u32 l2_packet)
{
replication_main_t *rm = &replication_main;
replication_context_t *ctx;
uword thread_index = vm->thread_index;
ip4_header_t *ip;
u32 ctx_id;
/* Allocate a context, reserve context 0 */
if (PREDICT_FALSE (rm->contexts[thread_index] == 0))
pool_get_aligned (rm->contexts[thread_index], ctx, CLIB_CACHE_LINE_BYTES);
pool_get_aligned (rm->contexts[thread_index], ctx, CLIB_CACHE_LINE_BYTES);
ctx_id = ctx - rm->contexts[thread_index];
/* Save state from vlib buffer */
ctx->saved_free_list_index = vlib_buffer_get_free_list_index (b0);
ctx->current_data = b0->current_data;
ctx->flags = b0->flags & VNET_BUFFER_FLAGS_VLAN_BITS;
/* Set up vlib buffer hooks */
b0->recycle_count = ctx_id;
vlib_buffer_set_free_list_index (b0, rm->recycle_list_index);
b0->flags |= VLIB_BUFFER_RECYCLE;
/* Save feature state */
ctx->recycle_node_index = recycle_node_index;
/* Save vnet state */
clib_memcpy (ctx->vnet_buffer, vnet_buffer (b0),
sizeof (vnet_buffer_opaque_t));
/* Save packet contents */
ctx->l2_packet = l2_packet;
ip = (ip4_header_t *) vlib_buffer_get_current (b0);
if (l2_packet)
{
/* Save ethernet header */
ctx->l2_header[0] = ((u64 *) ip)[0];
ctx->l2_header[1] = ((u64 *) ip)[1];
ctx->l2_header[2] = ((u64 *) ip)[2];
/* set ip to the true ip header */
ip = (ip4_header_t *) (((u8 *) ip) + vnet_buffer (b0)->l2.l2_len);
}
/*
* Copy L3 fields.
* We need to save TOS for ip4 and ip6 packets.
* Fortunately the TOS field is
* in the first two bytes of both the ip4 and ip6 headers.
*/
ctx->ip_tos = *((u16 *) (ip));
/*
* Save the ip4 checksum as well. We just blindly save the corresponding two
* bytes even for ip6 packets.
*/
ctx->ip4_checksum = ip->checksum;
return ctx;
}
replication_context_t *
replication_recycle (vlib_main_t * vm, vlib_buffer_t * b0, u32 is_last)
{
replication_main_t *rm = &replication_main;
replication_context_t *ctx;
uword thread_index = vm->thread_index;
ip4_header_t *ip;
/* Get access to the replication context */
ctx = pool_elt_at_index (rm->contexts[thread_index], b0->recycle_count);
/* Restore vnet buffer state */
clib_memcpy (vnet_buffer (b0), ctx->vnet_buffer,
sizeof (vnet_buffer_opaque_t));
/* Restore the vlan flags */
b0->flags &= ~VNET_BUFFER_FLAGS_VLAN_BITS;
b0->flags |= ctx->flags;
/* Restore the packet start (current_data) and length */
vlib_buffer_advance (b0, ctx->current_data - b0->current_data);
/* Restore packet contents */
ip = (ip4_header_t *) vlib_buffer_get_current (b0);
if (ctx->l2_packet)
{
/* Restore ethernet header */
((u64 *) ip)[0] = ctx->l2_header[0];
((u64 *) ip)[1] = ctx->l2_header[1];
((u64 *) ip)[2] = ctx->l2_header[2];
/* set ip to the true ip header */
ip = (ip4_header_t *) (((u8 *) ip) + vnet_buffer (b0)->l2.l2_len);
}
// Restore L3 fields
*((u16 *) (ip)) = ctx->ip_tos;
ip->checksum = ctx->ip4_checksum;
if (is_last)
{
/*
* This is the last replication in the list.
* Restore original buffer free functionality.
*/
vlib_buffer_set_free_list_index (b0, ctx->saved_free_list_index);
b0->flags &= ~VLIB_BUFFER_RECYCLE;
/* Free context back to its pool */
pool_put (rm->contexts[thread_index], ctx);
}
return ctx;
}
/*
* fish pkts back from the recycle queue/freelist
* un-flatten the context chains
*/
static void
replication_recycle_callback (vlib_main_t * vm, vlib_buffer_free_list_t * fl)
{
vlib_frame_t *f = 0;
u32 n_left_from;
u32 n_left_to_next = 0;
u32 n_this_frame = 0;
u32 *from;
u32 *to_next = 0;
u32 bi0, pi0;
vlib_buffer_t *b0;
int i;
replication_main_t *rm = &replication_main;
replication_context_t *ctx;
u32 feature_node_index = 0;
uword thread_index = vm->thread_index;
/*
* All buffers in the list are destined to the same recycle node.
* Pull the recycle node index from the first buffer.
* Note: this could be sped up if the node index were stuffed into
* the freelist itself.
*/
if (vec_len (fl->buffers) > 0)
{
bi0 = fl->buffers[0];
b0 = vlib_get_buffer (vm, bi0);
ctx = pool_elt_at_index (rm->contexts[thread_index], b0->recycle_count);
feature_node_index = ctx->recycle_node_index;
}
/* buffers */
for (i = 0; i < 2; i++)
{
if (i == 0)
{
from = fl->buffers;
n_left_from = vec_len (from);
}
while (n_left_from > 0)
{
if (PREDICT_FALSE (n_left_to_next == 0))
{
if (f)
{
f->n_vectors = n_this_frame;
vlib_put_frame_to_node (vm, feature_node_index, f);
}
f = vlib_get_frame_to_node (vm, feature_node_index);
to_next = vlib_frame_vector_args (f);
n_left_to_next = VLIB_FRAME_SIZE;
n_this_frame = 0;
}
bi0 = from[0];
if (PREDICT_TRUE (n_left_from > 1))
{
pi0 = from[1];
vlib_prefetch_buffer_with_index (vm, pi0, LOAD);
}
b0 = vlib_get_buffer (vm, bi0);
/* Mark that this buffer was just recycled */
b0->flags |= VLIB_BUFFER_IS_RECYCLED;
#if (CLIB_DEBUG > 0)
if (buffer_main.callbacks_registered == 0)
vlib_buffer_set_known_state (bi0, VLIB_BUFFER_KNOWN_ALLOCATED);
#endif
/* If buffer is traced, mark frame as traced */
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
f->flags |= VLIB_FRAME_TRACE;
to_next[0] = bi0;
from++;
to_next++;
n_this_frame++;
n_left_to_next--;
n_left_from--;
}
}
vec_reset_length (fl->buffers);
if (f)
{
ASSERT (n_this_frame);
f->n_vectors = n_this_frame;
vlib_put_frame_to_node (vm, feature_node_index, f);
}
}
clib_error_t *
replication_init (vlib_main_t * vm)
{
replication_main_t *rm = &replication_main;
vlib_buffer_free_list_t *fl;
__attribute__ ((unused)) replication_context_t *ctx;
vlib_thread_main_t *tm = vlib_get_thread_main ();
rm->vlib_main = vm;
rm->vnet_main = vnet_get_main ();
rm->recycle_list_index =
vlib_buffer_create_free_list (vm, 1024 /* fictional */ ,
"replication-recycle");
fl = pool_elt_at_index (vm->buffer_free_list_pool, rm->recycle_list_index);
fl->buffers_added_to_freelist_function = replication_recycle_callback;
/* Verify the replication context is the expected size */
ASSERT (sizeof (replication_context_t) == 128); /* 2 cache lines */
vec_validate (rm->contexts, tm->n_vlib_mains - 1);
return 0;
}
VLIB_INIT_FUNCTION (replication_init);
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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