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 = (void *) vlib_buffer_get_current (b0) -
113 ethernet_buffer_header_size (b0);
116 b1 = vlib_get_buffer (vm, bi1);
117 h1 = (void *) vlib_buffer_get_current (b1) -
118 ethernet_buffer_header_size (b1);
120 cd_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
121 cd0 = classify_dpo_get (cd_index0);
122 table_index0 = cd0->cd_table_index;
124 cd_index1 = vnet_buffer (b1)->ip.adj_index[VLIB_TX];
125 cd1 = classify_dpo_get (cd_index1);
126 table_index1 = cd1->cd_table_index;
128 t0 = pool_elt_at_index (vcm->tables, table_index0);
130 t1 = pool_elt_at_index (vcm->tables, table_index1);
132 vnet_buffer (b0)->l2_classify.hash =
133 vnet_classify_hash_packet (t0, (u8 *) h0);
135 vnet_classify_prefetch_bucket (t0, vnet_buffer (b0)->l2_classify.hash);
137 vnet_buffer (b1)->l2_classify.hash =
138 vnet_classify_hash_packet (t1, (u8 *) h1);
140 vnet_classify_prefetch_bucket (t1, vnet_buffer (b1)->l2_classify.hash);
142 vnet_buffer (b0)->l2_classify.table_index = table_index0;
144 vnet_buffer (b1)->l2_classify.table_index = table_index1;
150 while (n_left_from > 0)
158 vnet_classify_table_t *t0;
161 b0 = vlib_get_buffer (vm, bi0);
162 h0 = (void *) vlib_buffer_get_current (b0) -
163 ethernet_buffer_header_size (b0);
165 cd_index0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
166 cd0 = classify_dpo_get (cd_index0);
167 table_index0 = cd0->cd_table_index;
169 t0 = pool_elt_at_index (vcm->tables, table_index0);
170 vnet_buffer (b0)->l2_classify.hash =
171 vnet_classify_hash_packet (t0, (u8 *) h0);
173 vnet_buffer (b0)->l2_classify.table_index = table_index0;
174 vnet_classify_prefetch_bucket (t0, vnet_buffer (b0)->l2_classify.hash);
180 next_index = node->cached_next_index;
181 from = vlib_frame_vector_args (frame);
182 n_left_from = frame->n_vectors;
184 while (n_left_from > 0)
188 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
190 /* Not enough load/store slots to dual loop... */
191 while (n_left_from > 0 && n_left_to_next > 0)
195 u32 next0 = IP_LOOKUP_NEXT_DROP;
197 vnet_classify_table_t *t0;
198 vnet_classify_entry_t *e0;
202 /* Stride 3 seems to work best */
203 if (PREDICT_TRUE (n_left_from > 3))
205 vlib_buffer_t *p1 = vlib_get_buffer (vm, from[3]);
206 vnet_classify_table_t *tp1;
210 table_index1 = vnet_buffer (p1)->l2_classify.table_index;
212 if (PREDICT_TRUE (table_index1 != ~0))
214 tp1 = pool_elt_at_index (vcm->tables, table_index1);
215 phash1 = vnet_buffer (p1)->l2_classify.hash;
216 vnet_classify_prefetch_entry (tp1, phash1);
220 /* speculatively enqueue b0 to the current next frame */
228 b0 = vlib_get_buffer (vm, bi0);
230 table_index0 = vnet_buffer (b0)->l2_classify.table_index;
233 vnet_buffer (b0)->l2_classify.opaque_index = ~0;
235 if (PREDICT_TRUE (table_index0 != ~0))
237 hash0 = vnet_buffer (b0)->l2_classify.hash;
238 t0 = pool_elt_at_index (vcm->tables, table_index0);
240 e0 = vnet_classify_find_entry (t0, (u8 *) h0, hash0, now);
243 vnet_buffer (b0)->l2_classify.opaque_index
245 vlib_buffer_advance (b0, e0->advance);
246 next0 = (e0->next_index < node->n_next_nodes) ?
247 e0->next_index : next0;
254 if (t0->next_table_index != ~0)
255 t0 = pool_elt_at_index (vcm->tables,
256 t0->next_table_index);
259 next0 = (t0->miss_next_index < n_next) ?
260 t0->miss_next_index : next0;
265 hash0 = vnet_classify_hash_packet (t0, (u8 *) h0);
266 e0 = vnet_classify_find_entry
267 (t0, (u8 *) h0, hash0, now);
270 vnet_buffer (b0)->l2_classify.opaque_index
272 vlib_buffer_advance (b0, e0->advance);
273 next0 = (e0->next_index < node->n_next_nodes) ?
274 e0->next_index : next0;
283 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
284 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
286 ip_classify_trace_t *t =
287 vlib_add_trace (vm, node, b0, sizeof (*t));
288 t->next_index = next0;
289 t->table_index = t0 ? t0 - vcm->tables : ~0;
290 t->entry_index = e0 ? e0 - t0->entries : ~0;
293 /* verify speculative enqueue, maybe switch current next frame */
294 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
295 to_next, n_left_to_next,
299 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
302 vlib_node_increment_counter (vm, node->node_index,
303 IP_CLASSIFY_ERROR_MISS, misses);
304 vlib_node_increment_counter (vm, node->node_index,
305 IP_CLASSIFY_ERROR_HIT, hits);
306 vlib_node_increment_counter (vm, node->node_index,
307 IP_CLASSIFY_ERROR_CHAIN_HIT, chain_hits);
308 return frame->n_vectors;
311 VLIB_NODE_FN (ip4_classify_node) (vlib_main_t * vm,
312 vlib_node_runtime_t * node,
313 vlib_frame_t * frame)
315 return ip_classify_inline (vm, node, frame, 1 /* is_ip4 */ );
320 VLIB_REGISTER_NODE (ip4_classify_node) = {
321 .name = "ip4-classify",
322 .vector_size = sizeof (u32),
323 .sibling_of = "ip4-lookup",
324 .format_trace = format_ip_classify_trace,
325 .n_errors = ARRAY_LEN(ip_classify_error_strings),
326 .error_strings = ip_classify_error_strings,
332 VLIB_NODE_FN (ip6_classify_node) (vlib_main_t * vm,
333 vlib_node_runtime_t * node,
334 vlib_frame_t * frame)
336 return ip_classify_inline (vm, node, frame, 0 /* is_ip4 */ );
341 VLIB_REGISTER_NODE (ip6_classify_node) = {
342 .name = "ip6-classify",
343 .vector_size = sizeof (u32),
344 .sibling_of = "ip6-lookup",
345 .format_trace = format_ip_classify_trace,
346 .n_errors = ARRAY_LEN(ip_classify_error_strings),
347 .error_strings = ip_classify_error_strings,
353 #ifndef CLIB_MARCH_VARIANT
354 static clib_error_t *
355 ip_classify_init (vlib_main_t * vm)
360 VLIB_INIT_FUNCTION (ip_classify_init);
361 #endif /* CLIB_MARCH_VARIANT */
364 * fd.io coding-style-patch-verification: ON
367 * eval: (c-set-style "gnu")