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 #define foreach_ip_classify_error \
41 _(MISS, "Classify misses") \
42 _(HIT, "Classify hits") \
43 _(CHAIN_HIT, "Classify hits after chain walk")
47 #define _(sym,str) IP_CLASSIFY_ERROR_##sym,
48 foreach_ip_classify_error
51 } ip_classify_error_t;
53 static char *ip_classify_error_strings[] = {
54 #define _(sym,string) string,
55 foreach_ip_classify_error
60 ip_classify_inline (vlib_main_t * vm,
61 vlib_node_runtime_t * node,
62 vlib_frame_t * frame, int is_ip4)
64 u32 n_left_from, *from, *to_next;
65 ip_lookup_next_t next_index;
66 vnet_classify_main_t *vcm = &vnet_classify_main;
67 f64 now = vlib_time_now (vm);
75 n_next = IP4_LOOKUP_N_NEXT;
79 n_next = IP6_LOOKUP_N_NEXT;
82 from = vlib_frame_vector_args (frame);
83 n_left_from = frame->n_vectors;
85 /* First pass: compute hashes */
87 while (n_left_from > 2)
89 vlib_buffer_t *b0, *b1;
92 u32 cd_index0, cd_index1;
93 classify_dpo_t *cd0, *cd1;
94 u32 table_index0, table_index1;
95 vnet_classify_table_t *t0, *t1;
97 /* prefetch next iteration */
99 vlib_buffer_t *p1, *p2;
101 p1 = vlib_get_buffer (vm, from[1]);
102 p2 = vlib_get_buffer (vm, from[2]);
104 vlib_prefetch_buffer_header (p1, STORE);
105 CLIB_PREFETCH (p1->data, CLIB_CACHE_LINE_BYTES, STORE);
106 vlib_prefetch_buffer_header (p2, STORE);
107 CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
111 b0 = vlib_get_buffer (vm, bi0);
112 h0 = vlib_buffer_get_current (b0) - ethernet_buffer_header_size (b0);
115 b1 = vlib_get_buffer (vm, bi1);
116 h1 = vlib_buffer_get_current (b1) - ethernet_buffer_header_size (b1);
118 cd_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
119 cd0 = classify_dpo_get (cd_index0);
120 table_index0 = cd0->cd_table_index;
122 cd_index1 = vnet_buffer (b1)->ip.adj_index[VLIB_TX];
123 cd1 = classify_dpo_get (cd_index1);
124 table_index1 = cd1->cd_table_index;
126 t0 = pool_elt_at_index (vcm->tables, table_index0);
128 t1 = pool_elt_at_index (vcm->tables, table_index1);
130 vnet_buffer (b0)->l2_classify.hash = vnet_classify_hash_packet (t0, h0);
132 vnet_classify_prefetch_bucket (t0, vnet_buffer (b0)->l2_classify.hash);
134 vnet_buffer (b1)->l2_classify.hash = vnet_classify_hash_packet (t1, h1);
136 vnet_classify_prefetch_bucket (t1, vnet_buffer (b1)->l2_classify.hash);
138 vnet_buffer (b0)->l2_classify.table_index = table_index0;
140 vnet_buffer (b1)->l2_classify.table_index = table_index1;
146 while (n_left_from > 0)
154 vnet_classify_table_t *t0;
157 b0 = vlib_get_buffer (vm, bi0);
158 h0 = vlib_buffer_get_current (b0) - ethernet_buffer_header_size (b0);
160 cd_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
161 cd0 = classify_dpo_get (cd_index0);
162 table_index0 = cd0->cd_table_index;
164 t0 = pool_elt_at_index (vcm->tables, table_index0);
165 vnet_buffer (b0)->l2_classify.hash = vnet_classify_hash_packet (t0, h0);
167 vnet_buffer (b0)->l2_classify.table_index = table_index0;
168 vnet_classify_prefetch_bucket (t0, vnet_buffer (b0)->l2_classify.hash);
174 next_index = node->cached_next_index;
175 from = vlib_frame_vector_args (frame);
176 n_left_from = frame->n_vectors;
178 while (n_left_from > 0)
182 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
184 /* Not enough load/store slots to dual loop... */
185 while (n_left_from > 0 && n_left_to_next > 0)
189 u32 next0 = IP_LOOKUP_NEXT_DROP;
191 vnet_classify_table_t *t0;
192 vnet_classify_entry_t *e0;
196 /* Stride 3 seems to work best */
197 if (PREDICT_TRUE (n_left_from > 3))
199 vlib_buffer_t *p1 = vlib_get_buffer (vm, from[3]);
200 vnet_classify_table_t *tp1;
204 table_index1 = vnet_buffer (p1)->l2_classify.table_index;
206 if (PREDICT_TRUE (table_index1 != ~0))
208 tp1 = pool_elt_at_index (vcm->tables, table_index1);
209 phash1 = vnet_buffer (p1)->l2_classify.hash;
210 vnet_classify_prefetch_entry (tp1, phash1);
214 /* speculatively enqueue b0 to the current next frame */
222 b0 = vlib_get_buffer (vm, bi0);
224 table_index0 = vnet_buffer (b0)->l2_classify.table_index;
227 vnet_buffer (b0)->l2_classify.opaque_index = ~0;
229 if (PREDICT_TRUE (table_index0 != ~0))
231 hash0 = vnet_buffer (b0)->l2_classify.hash;
232 t0 = pool_elt_at_index (vcm->tables, table_index0);
234 e0 = vnet_classify_find_entry (t0, h0, hash0, now);
237 vnet_buffer (b0)->l2_classify.opaque_index
239 vlib_buffer_advance (b0, e0->advance);
240 next0 = (e0->next_index < node->n_next_nodes) ?
241 e0->next_index : next0;
248 if (t0->next_table_index != ~0)
249 t0 = pool_elt_at_index (vcm->tables,
250 t0->next_table_index);
253 next0 = (t0->miss_next_index < n_next) ?
254 t0->miss_next_index : next0;
259 hash0 = vnet_classify_hash_packet (t0, h0);
260 e0 = vnet_classify_find_entry (t0, h0, hash0, now);
263 vnet_buffer (b0)->l2_classify.opaque_index
265 vlib_buffer_advance (b0, e0->advance);
266 next0 = (e0->next_index < node->n_next_nodes) ?
267 e0->next_index : next0;
276 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
277 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
279 ip_classify_trace_t *t =
280 vlib_add_trace (vm, node, b0, sizeof (*t));
281 t->next_index = next0;
282 t->table_index = t0 ? t0 - vcm->tables : ~0;
283 t->entry_index = e0 ? e0 - t0->entries : ~0;
286 /* verify speculative enqueue, maybe switch current next frame */
287 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
288 to_next, n_left_to_next,
292 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
295 vlib_node_increment_counter (vm, node->node_index,
296 IP_CLASSIFY_ERROR_MISS, misses);
297 vlib_node_increment_counter (vm, node->node_index,
298 IP_CLASSIFY_ERROR_HIT, hits);
299 vlib_node_increment_counter (vm, node->node_index,
300 IP_CLASSIFY_ERROR_CHAIN_HIT, chain_hits);
301 return frame->n_vectors;
304 VLIB_NODE_FN (ip4_classify_node) (vlib_main_t * vm,
305 vlib_node_runtime_t * node,
306 vlib_frame_t * frame)
308 return ip_classify_inline (vm, node, frame, 1 /* is_ip4 */ );
313 VLIB_REGISTER_NODE (ip4_classify_node) = {
314 .name = "ip4-classify",
315 .vector_size = sizeof (u32),
316 .sibling_of = "ip4-lookup",
317 .format_trace = format_ip_classify_trace,
318 .n_errors = ARRAY_LEN(ip_classify_error_strings),
319 .error_strings = ip_classify_error_strings,
325 VLIB_NODE_FN (ip6_classify_node) (vlib_main_t * vm,
326 vlib_node_runtime_t * node,
327 vlib_frame_t * frame)
329 return ip_classify_inline (vm, node, frame, 0 /* is_ip4 */ );
334 VLIB_REGISTER_NODE (ip6_classify_node) = {
335 .name = "ip6-classify",
336 .vector_size = sizeof (u32),
337 .sibling_of = "ip6-lookup",
338 .format_trace = format_ip_classify_trace,
339 .n_errors = ARRAY_LEN(ip_classify_error_strings),
340 .error_strings = ip_classify_error_strings,
346 #ifndef CLIB_MARCH_VARIANT
347 static clib_error_t *
348 ip_classify_init (vlib_main_t * vm)
353 VLIB_INIT_FUNCTION (ip_classify_init);
354 #endif /* CLIB_MARCH_VARIANT */
357 * fd.io coding-style-patch-verification: ON
360 * eval: (c-set-style "gnu")