2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
15 #include <vnet/ip/ip.h>
16 #include <vnet/ethernet/ethernet.h> /* for ethernet_header_t */
17 #include <vnet/classify/vnet_classify.h>
23 } ip_classify_trace_t;
25 /* packet trace format function */
26 static u8 * format_ip_classify_trace (u8 * s, va_list * args)
28 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
29 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
30 ip_classify_trace_t * t = va_arg (*args, ip_classify_trace_t *);
32 s = format (s, "IP_CLASSIFY: next_index %d, table %d, entry %d",
33 t->next_index, t->table_index, t->entry_index);
37 vlib_node_registration_t ip4_classify_node;
38 vlib_node_registration_t ip6_classify_node;
40 #define foreach_ip_classify_error \
41 _(MISS, "Classify misses") \
42 _(HIT, "Classify hits") \
43 _(CHAIN_HIT, "Classify hits after chain walk")
46 #define _(sym,str) IP_CLASSIFY_ERROR_##sym,
47 foreach_ip_classify_error
50 } ip_classify_error_t;
52 static char * ip_classify_error_strings[] = {
53 #define _(sym,string) string,
54 foreach_ip_classify_error
59 ip_classify_inline (vlib_main_t * vm,
60 vlib_node_runtime_t * node,
61 vlib_frame_t * frame, int is_ip4)
63 u32 n_left_from, * from, * to_next;
64 ip_lookup_next_t next_index;
65 vnet_classify_main_t * vcm = &vnet_classify_main;
66 ip_lookup_main_t * lm;
67 f64 now = vlib_time_now (vm);
73 lm = &ip4_main.lookup_main;
75 lm = &ip6_main.lookup_main;
77 from = vlib_frame_vector_args (frame);
78 n_left_from = frame->n_vectors;
80 /* First pass: compute hashes */
82 while (n_left_from > 2)
84 vlib_buffer_t * b0, * b1;
87 u32 adj_index0, adj_index1;
88 ip_adjacency_t * adj0, * adj1;
89 u32 table_index0, table_index1;
90 vnet_classify_table_t * t0, * t1;
92 /* prefetch next iteration */
94 vlib_buffer_t * p1, * p2;
96 p1 = vlib_get_buffer (vm, from[1]);
97 p2 = vlib_get_buffer (vm, from[2]);
99 vlib_prefetch_buffer_header (p1, STORE);
100 CLIB_PREFETCH (p1->data, CLIB_CACHE_LINE_BYTES, STORE);
101 vlib_prefetch_buffer_header (p2, STORE);
102 CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
106 b0 = vlib_get_buffer (vm, bi0);
107 h0 = (void *)vlib_buffer_get_current(b0) -
108 ethernet_buffer_header_size(b0);
111 b1 = vlib_get_buffer (vm, bi1);
112 h1 = (void *)vlib_buffer_get_current(b1) -
113 ethernet_buffer_header_size(b1);
115 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
116 adj0 = ip_get_adjacency (lm, adj_index0);
117 table_index0 = adj0->classify.table_index;
119 adj_index1 = vnet_buffer (b1)->ip.adj_index[VLIB_TX];
120 adj1 = ip_get_adjacency (lm, adj_index1);
121 table_index1 = adj1->classify.table_index;
123 t0 = pool_elt_at_index (vcm->tables, table_index0);
125 t1 = pool_elt_at_index (vcm->tables, table_index1);
127 vnet_buffer(b0)->l2_classify.hash =
128 vnet_classify_hash_packet (t0, (u8 *) h0);
130 vnet_classify_prefetch_bucket (t0, vnet_buffer(b0)->l2_classify.hash);
132 vnet_buffer(b1)->l2_classify.hash =
133 vnet_classify_hash_packet (t1, (u8 *) h1);
135 vnet_classify_prefetch_bucket (t1, vnet_buffer(b1)->l2_classify.hash);
137 vnet_buffer(b0)->l2_classify.table_index = table_index0;
139 vnet_buffer(b1)->l2_classify.table_index = table_index1;
145 while (n_left_from > 0)
151 ip_adjacency_t * adj0;
153 vnet_classify_table_t * t0;
156 b0 = vlib_get_buffer (vm, bi0);
157 h0 = (void *)vlib_buffer_get_current(b0) -
158 ethernet_buffer_header_size(b0);
160 adj_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
161 adj0 = ip_get_adjacency (lm, adj_index0);
162 table_index0 = adj0->classify.table_index;
164 t0 = pool_elt_at_index (vcm->tables, table_index0);
165 vnet_buffer(b0)->l2_classify.hash =
166 vnet_classify_hash_packet (t0, (u8 *) h0);
168 vnet_buffer(b0)->l2_classify.table_index = table_index0;
169 vnet_classify_prefetch_bucket (t0, vnet_buffer(b0)->l2_classify.hash);
175 next_index = node->cached_next_index;
176 from = vlib_frame_vector_args (frame);
177 n_left_from = frame->n_vectors;
179 while (n_left_from > 0)
183 vlib_get_next_frame (vm, node, next_index,
184 to_next, n_left_to_next);
186 /* Not enough load/store slots to dual loop... */
187 while (n_left_from > 0 && n_left_to_next > 0)
191 u32 next0 = IP_LOOKUP_NEXT_MISS;
193 vnet_classify_table_t * t0;
194 vnet_classify_entry_t * e0;
198 /* Stride 3 seems to work best */
199 if (PREDICT_TRUE (n_left_from > 3))
201 vlib_buffer_t * p1 = vlib_get_buffer(vm, from[3]);
202 vnet_classify_table_t * tp1;
206 table_index1 = vnet_buffer(p1)->l2_classify.table_index;
208 if (PREDICT_TRUE (table_index1 != ~0))
210 tp1 = pool_elt_at_index (vcm->tables, table_index1);
211 phash1 = vnet_buffer(p1)->l2_classify.hash;
212 vnet_classify_prefetch_entry (tp1, phash1);
216 /* speculatively enqueue b0 to the current next frame */
224 b0 = vlib_get_buffer (vm, bi0);
226 table_index0 = vnet_buffer(b0)->l2_classify.table_index;
229 vnet_buffer(b0)->l2_classify.opaque_index = ~0;
231 if (PREDICT_TRUE(table_index0 != ~0))
233 hash0 = vnet_buffer(b0)->l2_classify.hash;
234 t0 = pool_elt_at_index (vcm->tables, table_index0);
236 e0 = vnet_classify_find_entry (t0, (u8 *) h0, hash0,
240 vnet_buffer(b0)->l2_classify.opaque_index
242 vlib_buffer_advance (b0, e0->advance);
243 next0 = (e0->next_index < node->n_next_nodes)?
244 e0->next_index:next0;
251 if (t0->next_table_index != ~0)
252 t0 = pool_elt_at_index (vcm->tables,
253 t0->next_table_index);
256 next0 = (t0->miss_next_index < IP_LOOKUP_N_NEXT)?
257 t0->miss_next_index:next0;
262 hash0 = vnet_classify_hash_packet (t0, (u8 *) h0);
263 e0 = vnet_classify_find_entry
264 (t0, (u8 *) h0, hash0, now);
267 vnet_buffer(b0)->l2_classify.opaque_index
269 vlib_buffer_advance (b0, e0->advance);
270 next0 = (e0->next_index < node->n_next_nodes)?
271 e0->next_index:next0;
280 if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE)
281 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
283 ip_classify_trace_t *t =
284 vlib_add_trace (vm, node, b0, sizeof (*t));
285 t->next_index = next0;
286 t->table_index = t0 ? t0 - vcm->tables : ~0;
287 t->entry_index = e0 ? e0 - t0->entries : ~0;
290 /* verify speculative enqueue, maybe switch current next frame */
291 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
292 to_next, n_left_to_next,
296 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
299 vlib_node_increment_counter (vm, node->node_index,
300 IP_CLASSIFY_ERROR_MISS,
302 vlib_node_increment_counter (vm, node->node_index,
303 IP_CLASSIFY_ERROR_HIT,
305 vlib_node_increment_counter (vm, node->node_index,
306 IP_CLASSIFY_ERROR_CHAIN_HIT,
308 return frame->n_vectors;
312 ip4_classify (vlib_main_t * vm,
313 vlib_node_runtime_t * node,
314 vlib_frame_t * frame)
316 return ip_classify_inline (vm, node, frame, 1 /* is_ip4 */);
320 VLIB_REGISTER_NODE (ip4_classify_node) = {
321 .function = ip4_classify,
322 .name = "ip4-classify",
323 .vector_size = sizeof (u32),
324 .format_trace = format_ip_classify_trace,
325 .n_errors = ARRAY_LEN(ip_classify_error_strings),
326 .error_strings = ip_classify_error_strings,
328 .n_next_nodes = IP_LOOKUP_N_NEXT,
329 .next_nodes = IP4_LOOKUP_NEXT_NODES,
333 ip6_classify (vlib_main_t * vm,
334 vlib_node_runtime_t * node,
335 vlib_frame_t * frame)
337 return ip_classify_inline (vm, node, frame, 0 /* is_ip4 */);
341 VLIB_REGISTER_NODE (ip6_classify_node) = {
342 .function = ip6_classify,
343 .name = "ip6-classify",
344 .vector_size = sizeof (u32),
345 .format_trace = format_ip_classify_trace,
346 .n_errors = ARRAY_LEN(ip_classify_error_strings),
347 .error_strings = ip_classify_error_strings,
349 .n_next_nodes = IP_LOOKUP_N_NEXT,
350 .next_nodes = IP6_LOOKUP_NEXT_NODES,
353 static clib_error_t *
354 ip_classify_init (vlib_main_t * vm)
359 VLIB_INIT_FUNCTION (ip_classify_init);