/*
* Copyright (c) 2016 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 <stdint.h>
#include <vlib/vlib.h>
#include <vnet/vnet.h>
#include <vnet/ip/ip.h>
#include <vnet/classify/flow_classify.h>
#include <vnet/classify/vnet_classify.h>
typedef struct {
u32 sw_if_index;
u32 next_index;
u32 table_index;
u32 offset;
} flow_classify_trace_t;
static u8 *
format_flow_classify_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 *);
flow_classify_trace_t * t = va_arg (*args, flow_classify_trace_t *);
s = format (s, "FLOW_CLASSIFY: sw_if_index %d next %d table %d offset %d",
t->sw_if_index, t->next_index, t->table_index, t->offset);
return s;
}
#define foreach_flow_classify_error \
_(MISS, "Flow classify misses") \
_(HIT, "Flow classify hits") \
_(CHAIN_HIT, "Flow classify hits after chain walk") \
_(DROP, "Flow classify action drop")
typedef enum {
#define _(sym,str) FLOW_CLASSIFY_ERROR_##sym,
foreach_flow_classify_error
#undef _
FLOW_CLASSIFY_N_ERROR,
} flow_classify_error_t;
static char * flow_classify_error_strings[] = {
#define _(sym,string) string,
foreach_flow_classify_error
#undef _
};
static inline uword
flow_classify_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame,
flow_classify_table_id_t tid)
{
u32 n_left_from, * from, * to_next;
flow_classify_next_index_t next_index;
flow_classify_main_t * fcm = &flow_classify_main;
vnet_classify_main_t * vcm = fcm->vnet_classify_main;
f64 now = vlib_time_now (vm);
u32 hits = 0;
u32 misses = 0;
u32 chain_hits = 0;
u32 drop = 0;
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
/* First pass: compute hashes */
while (n_left_from > 2)
{
vlib_buffer_t * b0, * b1;
u32 bi0, bi1;
u8 * h0, * h1;
u32 sw_if_index0, sw_if_index1;
u32 table_index0, table_index1;
vnet_classify_table_t * t0, * t1;
/* Prefetch next iteration */
{
vlib_buffer_t * p1, * p2;
p1 = vlib_get_buffer (vm, from[1]);
p2 = vlib_get_buffer (vm, from[2]);
vlib_prefetch_buffer_header (p1, STORE);
CLIB_PREFETCH (p1->data, CLIB_CACHE_LINE_BYTES, STORE);
vlib_prefetch_buffer_header (p2, STORE);
CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
}
bi0 = from[0];
b0 = vlib_get_buffer (vm, bi0);
h0 = b0->data;
bi1 = from[1];
b1 = vlib_get_buffer (vm, bi1);
h1 = b1->data;
sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
table_index0 = fcm->classify_table_index_by_sw_if_index[tid][sw_if_index0];
sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
table_index1 = fcm->classify_table_index_by_sw_if_index[tid][sw_if_index1];
t0 = pool_elt_at_index (vcm->tables, table_index0);
t1 = pool_elt_at_index (vcm->tables, table_index1);
vnet_buffer(b0)->l2_classify.hash =
vnet_classify_hash_packet (t0, (u8 *) h0);
vnet_classify_prefetch_bucket (t0, vnet_buffer(b0)->l2_classify.hash);
vnet_buffer(b1)->l2_classify.hash =
vnet_classify_hash_packet (t1, (u8 *) h1);
vnet_classify_prefetch_bucket (t1, vnet_buffer(b1)->l2_classify.hash);
vnet_buffer(b0)->l2_classify.table_index = table_index0;
vnet_buffer(b1)->l2_classify.table_index = table_index1;
from += 2;
n_left_from -= 2;
}
while (n_left_from > 0)
{
vlib_buffer_t * b0;
u32 bi0;
u8 * h0;
u32 sw_if_index0;
u32 table_index0;
vnet_classify_table_t * t0;
bi0 = from[0];
b0 = vlib_get_buffer (vm, bi0);
h0 = b0->data;
sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
table_index0 = fcm->classify_table_index_by_sw_if_index[tid][sw_if_index0];
t0 = pool_elt_at_index (vcm->tables, table_index0);
vnet_buffer(b0)->l2_classify.hash =
vnet_classify_hash_packet (t0, (u8 *) h0);
vnet_buffer(b0)->l2_classify.table_index = table_index0;
vnet_classify_prefetch_bucket (t0, vnet_buffer(b0)->l2_classify.hash);
from++;
n_left_from--;
}
next_index = node->cached_next_index;
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors;
while (n_left_from > 0)
{
u32 n_left_to_next;
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
/* Not enough load/store slots to dual loop... */
while (n_left_from > 0 && n_left_to_next > 0)
{
u32 bi0;
vlib_buffer_t * b0;
u32 next0 = FLOW_CLASSIFY_NEXT_INDEX_DROP;
u32 table_index0;
vnet_classify_table_t * t0;
vnet_classify_entry_t * e0;
u64 hash0;
u8 * h0;
/* Stride 3 seems to work best */
if (PREDICT_TRUE (n_left_from > 3))
{
vlib_buffer_t * p1 = vlib_get_buffer(vm, from[3]);
vnet_classify_table_t * tp1;
u32 table_index1;
u64 phash1;
table_index1 = vnet_buffer(p1)->l2_classify.table_index;
if (PREDICT_TRUE (table_index1 != ~0))
{
tp1 = pool_elt_at_index (vcm->tables, table_index1);
phash1 = vnet_buffer(p1)->l2_classify.hash;
vnet_classify_prefetch_entry (tp1, phash1);
}
}
/* Speculatively enqueue b0 to the current next frame */
bi0 = from[0];
to_next[0] = bi0;
from += 1;
to_next += 1;
n_left_from -= 1;
n_left_to_next -= 1;
b0 = vlib_get_buffer (vm, bi0);
h0 = b0->data;
table_index0 = vnet_buffer(b0)->l2_classify.table_index;
e0 = 0;
t0 = 0;
vnet_get_config_data (fcm->vnet_config_main[tid],
&b0->current_config_index,
&next0,
/* # bytes of config data */ 0);
if (PREDICT_TRUE(table_index0 != ~0))
{
hash0 = vnet_buffer(b0)->l2_classify.hash;
t0 = pool_elt_at_index (vcm->tables, table_index0);
e0 = vnet_classify_find_entry (t0, (u8 *) h0, hash0, now);
if (e0)
{
hits++;
}
else
{
misses++;
vnet_classify_add_del_session (vcm, table_index0,
h0, ~0, 0, 0, 0, 0, 1);
/* increment counter */
vnet_classify_find_entry (t0, (u8 *) h0, hash0, now);
}
}
if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
&& (b0->flags & VLIB_BUFFER_IS_TRACED)))
{
flow_classify_trace_t * t =
vlib_add_trace (vm, node, b0, sizeof (*t));
t->sw_if_index = vnet_buffer(b0)->sw_if_index[VLIB_RX];
t->next_index = next0;
t->table_index = t0 ? t0 - vcm->tables : ~0;
t->offset = (t0 && e0) ? vnet_classify_get_offset (t0, e0): ~0;
}
/* Verify speculative enqueue, maybe switch current next frame */
vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
n_left_to_next, bi0, next0);
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
vlib_node_increment_counter (vm, node->node_index,
FLOW_CLASSIFY_ERROR_MISS,
misses);
vlib_node_increment_counter (vm, node->node_index,
FLOW_CLASSIFY_ERROR_HIT,
hits);
vlib_node_increment_counter (vm, node->node_index,
FLOW_CLASSIFY_ERROR_CHAIN_HIT,
chain_hits);
vlib_node_increment_counter (vm, node->node_index,
FLOW_CLASSIFY_ERROR_DROP,
drop);
return frame->n_vectors;
}
static uword
ip4_flow_classify (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return flow_classify_inline(vm, node, frame, FLOW_CLASSIFY_TABLE_IP4);
}
VLIB_REGISTER_NODE (ip4_flow_classify_node) = {
.function = ip4_flow_classify,
.name = "ip4-flow-classify",
.vector_size = sizeof (u32),
.format_trace = format_flow_classify_trace,
.n_errors = ARRAY_LEN(flow_classify_error_strings),
.error_strings = flow_classify_error_strings,
.n_next_nodes = FLOW_CLASSIFY_NEXT_INDEX_N_NEXT,
.next_nodes = {
[FLOW_CLASSIFY_NEXT_INDEX_DROP] = "error-drop",
},
};
VLIB_NODE_FUNCTION_MULTIARCH (ip4_flow_classify_node, ip4_flow_classify);
static uword
ip6_flow_classify (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return flow_classify_inline(vm, node, frame, FLOW_CLASSIFY_TABLE_IP6);
}
VLIB_REGISTER_NODE (ip6_flow_classify_node) = {
.function = ip6_flow_classify,
.name = "ip6-flow-classify",
.vector_size = sizeof (u32),
.format_trace = format_flow_classify_trace,
.n_errors = ARRAY_LEN(flow_classify_error_strings),
.error_strings = flow_classify_error_strings,
.n_next_nodes = FLOW_CLASSIFY_NEXT_INDEX_N_NEXT,
.next_nodes = {
[FLOW_CLASSIFY_NEXT_INDEX_DROP] = "error-drop",
},
};
VLIB_NODE_FUNCTION_MULTIARCH (ip6_flow_classify_node, ip6_flow_classify);
static clib_error_t *
flow_classify_init (vlib_main_t *vm)
{
flow_classify_main_t * fcm = &flow_classify_main;
fcm->vlib_main = vm;
fcm->vnet_main = vnet_get_main();
fcm->vnet_classify_main = &vnet_classify_main;
return 0;
}
VLIB_INIT_FUNCTION (flow_classify_init);
