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>
18 #include <vnet/dpo/classify_dpo.h>
25 } ip_classify_trace_t;
27 /* packet trace format function */
29 format_ip_classify_trace (u8 * s, va_list * args)
31 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
32 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
33 ip_classify_trace_t *t = va_arg (*args, ip_classify_trace_t *);
35 s = format (s, "IP_CLASSIFY: next_index %d, table %d, entry %d",
36 t->next_index, t->table_index, t->entry_index);
40 vlib_node_registration_t ip4_classify_node;
41 vlib_node_registration_t ip6_classify_node;
43 #define foreach_ip_classify_error \
44 _(MISS, "Classify misses") \
45 _(HIT, "Classify hits") \
46 _(CHAIN_HIT, "Classify hits after chain walk")
50 #define _(sym,str) IP_CLASSIFY_ERROR_##sym,
51 foreach_ip_classify_error
54 } ip_classify_error_t;
56 static char *ip_classify_error_strings[] = {
57 #define _(sym,string) string,
58 foreach_ip_classify_error
63 ip_classify_inline (vlib_main_t * vm,
64 vlib_node_runtime_t * node,
65 vlib_frame_t * frame, int is_ip4)
67 u32 n_left_from, *from, *to_next;
68 ip_lookup_next_t next_index;
69 vnet_classify_main_t *vcm = &vnet_classify_main;
70 f64 now = vlib_time_now (vm);
78 n_next = IP4_LOOKUP_N_NEXT;
82 n_next = IP6_LOOKUP_N_NEXT;
85 from = vlib_frame_vector_args (frame);
86 n_left_from = frame->n_vectors;
88 /* First pass: compute hashes */
90 while (n_left_from > 2)
92 vlib_buffer_t *b0, *b1;
95 u32 cd_index0, cd_index1;
96 classify_dpo_t *cd0, *cd1;
97 u32 table_index0, table_index1;
98 vnet_classify_table_t *t0, *t1;
100 /* prefetch next iteration */
102 vlib_buffer_t *p1, *p2;
104 p1 = vlib_get_buffer (vm, from[1]);
105 p2 = vlib_get_buffer (vm, from[2]);
107 vlib_prefetch_buffer_header (p1, STORE);
108 CLIB_PREFETCH (p1->data, CLIB_CACHE_LINE_BYTES, STORE);
109 vlib_prefetch_buffer_header (p2, STORE);
110 CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
114 b0 = vlib_get_buffer (vm, bi0);
115 h0 = (void *) vlib_buffer_get_current (b0) -
116 ethernet_buffer_header_size (b0);
119 b1 = vlib_get_buffer (vm, bi1);
120 h1 = (void *) vlib_buffer_get_current (b1) -
121 ethernet_buffer_header_size (b1);
123 cd_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
124 cd0 = classify_dpo_get (cd_index0);
125 table_index0 = cd0->cd_table_index;
127 cd_index1 = vnet_buffer (b1)->ip.adj_index[VLIB_TX];
128 cd1 = classify_dpo_get (cd_index1);
129 table_index1 = cd1->cd_table_index;
131 t0 = pool_elt_at_index (vcm->tables, table_index0);
133 t1 = pool_elt_at_index (vcm->tables, table_index1);
135 vnet_buffer (b0)->l2_classify.hash =
136 vnet_classify_hash_packet (t0, (u8 *) h0);
138 vnet_classify_prefetch_bucket (t0, vnet_buffer (b0)->l2_classify.hash);
140 vnet_buffer (b1)->l2_classify.hash =
141 vnet_classify_hash_packet (t1, (u8 *) h1);
143 vnet_classify_prefetch_bucket (t1, vnet_buffer (b1)->l2_classify.hash);
145 vnet_buffer (b0)->l2_classify.table_index = table_index0;
147 vnet_buffer (b1)->l2_classify.table_index = table_index1;
153 while (n_left_from > 0)
161 vnet_classify_table_t *t0;
164 b0 = vlib_get_buffer (vm, bi0);
165 h0 = (void *) vlib_buffer_get_current (b0) -
166 ethernet_buffer_header_size (b0);
168 cd_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
169 cd0 = classify_dpo_get (cd_index0);
170 table_index0 = cd0->cd_table_index;
172 t0 = pool_elt_at_index (vcm->tables, table_index0);
173 vnet_buffer (b0)->l2_classify.hash =
174 vnet_classify_hash_packet (t0, (u8 *) h0);
176 vnet_buffer (b0)->l2_classify.table_index = table_index0;
177 vnet_classify_prefetch_bucket (t0, vnet_buffer (b0)->l2_classify.hash);
183 next_index = node->cached_next_index;
184 from = vlib_frame_vector_args (frame);
185 n_left_from = frame->n_vectors;
187 while (n_left_from > 0)
191 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
193 /* Not enough load/store slots to dual loop... */
194 while (n_left_from > 0 && n_left_to_next > 0)
198 u32 next0 = IP_LOOKUP_NEXT_DROP;
200 vnet_classify_table_t *t0;
201 vnet_classify_entry_t *e0;
205 /* Stride 3 seems to work best */
206 if (PREDICT_TRUE (n_left_from > 3))
208 vlib_buffer_t *p1 = vlib_get_buffer (vm, from[3]);
209 vnet_classify_table_t *tp1;
213 table_index1 = vnet_buffer (p1)->l2_classify.table_index;
215 if (PREDICT_TRUE (table_index1 != ~0))
217 tp1 = pool_elt_at_index (vcm->tables, table_index1);
218 phash1 = vnet_buffer (p1)->l2_classify.hash;
219 vnet_classify_prefetch_entry (tp1, phash1);
223 /* speculatively enqueue b0 to the current next frame */
231 b0 = vlib_get_buffer (vm, bi0);
233 table_index0 = vnet_buffer (b0)->l2_classify.table_index;
236 vnet_buffer (b0)->l2_classify.opaque_index = ~0;
238 if (PREDICT_TRUE (table_index0 != ~0))
240 hash0 = vnet_buffer (b0)->l2_classify.hash;
241 t0 = pool_elt_at_index (vcm->tables, table_index0);
243 e0 = vnet_classify_find_entry (t0, (u8 *) h0, hash0, now);
246 vnet_buffer (b0)->l2_classify.opaque_index
248 vlib_buffer_advance (b0, e0->advance);
249 next0 = (e0->next_index < node->n_next_nodes) ?
250 e0->next_index : next0;
257 if (t0->next_table_index != ~0)
258 t0 = pool_elt_at_index (vcm->tables,
259 t0->next_table_index);
262 next0 = (t0->miss_next_index < n_next) ?
263 t0->miss_next_index : next0;
268 hash0 = vnet_classify_hash_packet (t0, (u8 *) h0);
269 e0 = vnet_classify_find_entry
270 (t0, (u8 *) h0, hash0, now);
273 vnet_buffer (b0)->l2_classify.opaque_index
275 vlib_buffer_advance (b0, e0->advance);
276 next0 = (e0->next_index < node->n_next_nodes) ?
277 e0->next_index : next0;
286 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
287 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
289 ip_classify_trace_t *t =
290 vlib_add_trace (vm, node, b0, sizeof (*t));
291 t->next_index = next0;
292 t->table_index = t0 ? t0 - vcm->tables : ~0;
293 t->entry_index = e0 ? e0 - t0->entries : ~0;
296 /* verify speculative enqueue, maybe switch current next frame */
297 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
298 to_next, n_left_to_next,
302 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
305 vlib_node_increment_counter (vm, node->node_index,
306 IP_CLASSIFY_ERROR_MISS, misses);
307 vlib_node_increment_counter (vm, node->node_index,
308 IP_CLASSIFY_ERROR_HIT, hits);
309 vlib_node_increment_counter (vm, node->node_index,
310 IP_CLASSIFY_ERROR_CHAIN_HIT, chain_hits);
311 return frame->n_vectors;
315 ip4_classify (vlib_main_t * vm,
316 vlib_node_runtime_t * node, vlib_frame_t * frame)
318 return ip_classify_inline (vm, node, frame, 1 /* is_ip4 */ );
323 VLIB_REGISTER_NODE (ip4_classify_node) = {
324 .function = ip4_classify,
325 .name = "ip4-classify",
326 .vector_size = sizeof (u32),
327 .sibling_of = "ip4-lookup",
328 .format_trace = format_ip_classify_trace,
329 .n_errors = ARRAY_LEN(ip_classify_error_strings),
330 .error_strings = ip_classify_error_strings,
336 VLIB_NODE_FUNCTION_MULTIARCH (ip4_classify_node, ip4_classify)
338 ip6_classify (vlib_main_t * vm,
339 vlib_node_runtime_t * node, vlib_frame_t * frame)
341 return ip_classify_inline (vm, node, frame, 0 /* is_ip4 */ );
346 VLIB_REGISTER_NODE (ip6_classify_node) = {
347 .function = ip6_classify,
348 .name = "ip6-classify",
349 .vector_size = sizeof (u32),
350 .sibling_of = "ip6-lookup",
351 .format_trace = format_ip_classify_trace,
352 .n_errors = ARRAY_LEN(ip_classify_error_strings),
353 .error_strings = ip_classify_error_strings,
359 VLIB_NODE_FUNCTION_MULTIARCH (ip6_classify_node, ip6_classify)
360 static clib_error_t *ip_classify_init (vlib_main_t * vm)
365 VLIB_INIT_FUNCTION (ip_classify_init);
368 * fd.io coding-style-patch-verification: ON
371 * eval: (c-set-style "gnu")