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/*
* Copyright (c) 2021-2022 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 "data_pcslookup.h"
#include "infra.h"
#include "mgmt.h"
#include "parser.h"
#include "state.h"
#include "strategy.h"
#include "strategy_dpo_manager.h"
/* Stats string values */
static char *hicn_data_pcslookup_error_strings[] = {
#define _(sym, string) string,
foreach_hicnfwd_error
#undef _
};
/* packet trace format function */
always_inline u8 *hicn_data_pcslookup_format_trace (u8 *s, va_list *args);
vlib_node_registration_t hicn_data_pcslookup_node;
/*
* hICN node for handling data. It performs a lookup in the PIT.
*/
static uword
hicn_data_pcslookup_node_fn (vlib_main_t *vm, vlib_node_runtime_t *node,
vlib_frame_t *frame)
{
u32 n_left_from, *from, *to_next;
hicn_data_pcslookup_next_t next_index;
hicn_data_pcslookup_runtime_t *rt;
vl_api_hicn_api_node_stats_get_reply_t stats = { 0 };
vlib_buffer_t *b0;
u32 bi0;
u32 next0 = HICN_DATA_PCSLOOKUP_NEXT_ERROR_DROP;
hicn_pcs_entry_t *pcs_entry = NULL;
hicn_buffer_t *hicnb0;
int ret;
rt = vlib_node_get_runtime_data (vm, node->node_index);
if (PREDICT_FALSE (rt->pitcs == NULL))
{
rt->pitcs = &hicn_main.pitcs;
}
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
next_index = node->cached_next_index;
while (n_left_from > 0)
{
u32 n_left_to_next;
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (n_left_from > 0 && n_left_to_next > 0)
{
// Prefetch for next iteration.
if (n_left_from > 1)
{
vlib_buffer_t *b1;
b1 = vlib_get_buffer (vm, from[1]);
// Prefetch two cache lines-- 128 byte-- so that we load the
// hicn_buffer_t as well
CLIB_PREFETCH (b1, 2 * CLIB_CACHE_LINE_BYTES, STORE);
}
// Dequeue a packet buffer
bi0 = from[0];
from += 1;
n_left_from -= 1;
to_next[0] = bi0;
to_next += 1;
n_left_to_next -= 1;
b0 = vlib_get_buffer (vm, bi0);
hicnb0 = hicn_get_buffer (b0);
// By default go to drop
next0 = HICN_DATA_PCSLOOKUP_NEXT_ERROR_DROP;
// Increase packet counters
stats.pkts_processed += 1;
stats.pkts_data_count += 1;
// Lookup the name in the PIT
hicn_name_t name;
hicn_packet_get_name (&hicn_get_buffer (b0)->pkbuf, &name);
ret = hicn_pcs_lookup_one (rt->pitcs, &name, &pcs_entry);
if (ret == HICN_ERROR_NONE)
{
ret = hicn_store_internal_state (
b0, hicn_pcs_entry_get_index (rt->pitcs, pcs_entry),
hicnb0->dpo_ctx_id);
/*
* In case the result of the lookup
* is a CS entry, the packet is
* dropped
*/
next0 = HICN_DATA_PCSLOOKUP_NEXT_DATA_FWD +
(hicn_pcs_entry_is_cs (pcs_entry) && !ret);
}
/*
* Verify speculative enqueue, maybe switch current
* next frame
*/
/*
* Fix in case of a wrong speculation. Needed to
* clone the data in the right frame
*/
vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
n_left_to_next, bi0, next0);
/* Maybe trace */
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
(b0->flags & VLIB_BUFFER_IS_TRACED)))
{
hicn_data_pcslookup_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
t->pkt_type = HICN_PACKET_TYPE_DATA;
t->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
t->next_index = next0;
}
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
/* Check the CS LRU, and trim if necessary. */
u32 pit_int_count = hicn_pcs_get_pit_count (rt->pitcs);
u32 pit_cs_count = hicn_pcs_get_cs_count (rt->pitcs);
vlib_node_increment_counter (vm, hicn_data_pcslookup_node.index,
HICNFWD_ERROR_PROCESSED, stats.pkts_processed);
vlib_node_increment_counter (vm, hicn_data_pcslookup_node.index,
HICNFWD_ERROR_DATAS, stats.pkts_data_count);
update_node_counter (vm, hicn_data_pcslookup_node.index,
HICNFWD_ERROR_INT_COUNT, pit_int_count);
update_node_counter (vm, hicn_data_pcslookup_node.index,
HICNFWD_ERROR_CS_COUNT, pit_cs_count);
return (frame->n_vectors);
}
/* packet trace format function */
static u8 *
hicn_data_pcslookup_format_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 *);
hicn_data_pcslookup_trace_t *t =
va_arg (*args, hicn_data_pcslookup_trace_t *);
s = format (s, "DATA-PCSLOOKUP: pkt: %d, sw_if_index %d, next index %d",
(int) t->pkt_type, t->sw_if_index, t->next_index);
return (s);
}
/*
* Node registration for the data forwarder node
*/
VLIB_REGISTER_NODE(hicn_data_pcslookup_node) =
{
.function = hicn_data_pcslookup_node_fn,
.name = "hicn-data-pcslookup",
.vector_size = sizeof(u32),
.runtime_data_bytes = sizeof(hicn_data_pcslookup_runtime_t),
.format_trace = hicn_data_pcslookup_format_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(hicn_data_pcslookup_error_strings),
.error_strings = hicn_data_pcslookup_error_strings,
.n_next_nodes = HICN_DATA_PCSLOOKUP_N_NEXT,
.next_nodes = {
[HICN_DATA_PCSLOOKUP_NEXT_DATA_FWD] = "hicn-data-fwd",
[HICN_DATA_PCSLOOKUP_NEXT_ERROR_DROP] = "error-drop",
},
};
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables: eval: (c-set-style "gnu") End:
*/
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