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.
16 * counter.h: simple and packet/byte counters
18 * Copyright (c) 2008 Eliot Dresselhaus
20 * Permission is hereby granted, free of charge, to any person obtaining
21 * a copy of this software and associated documentation files (the
22 * "Software"), to deal in the Software without restriction, including
23 * without limitation the rights to use, copy, modify, merge, publish,
24 * distribute, sublicense, and/or sell copies of the Software, and to
25 * permit persons to whom the Software is furnished to do so, subject to
26 * the following conditions:
28 * The above copyright notice and this permission notice shall be
29 * included in all copies or substantial portions of the Software.
31 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
40 #ifndef included_vlib_counter_h
41 #define included_vlib_counter_h
44 * Annoyingly enough, counters are created long before
45 * the CPU configuration is available, so we have to
46 * preallocate the mini-counter per-cpu vectors
51 /* Compact counters that (rarely) can overflow. */
54 /* Counters to hold overflow. */
57 /* Counter values as of last clear. */
58 u64 *value_at_last_clear;
60 /* Values as of last serialize. */
61 u64 *value_at_last_serialize;
63 /* Last counter index serialized incrementally. */
64 u32 last_incremental_serialize_index;
68 } vlib_simple_counter_main_t;
71 vlib_increment_simple_counter (vlib_simple_counter_main_t * cm,
72 u32 cpu_index, u32 index, u32 increment)
78 my_minis = cm->minis[cpu_index];
79 mini = vec_elt_at_index (my_minis, index);
81 new = old + increment;
84 if (PREDICT_FALSE (mini[0] != new))
86 __sync_fetch_and_add (&cm->maxi[index], new);
92 vlib_get_simple_counter (vlib_simple_counter_main_t * cm, u32 index)
98 ASSERT (index < vec_len (cm->maxi));
102 for (i = 0; i < vec_len (cm->minis); i++)
104 my_minis = cm->minis[i];
105 mini = vec_elt_at_index (my_minis, index);
109 v += cm->maxi[index];
111 if (index < vec_len (cm->value_at_last_clear))
113 ASSERT (v >= cm->value_at_last_clear[index]);
114 v -= cm->value_at_last_clear[index];
121 vlib_zero_simple_counter (vlib_simple_counter_main_t * cm, u32 index)
126 ASSERT (index < vec_len (cm->maxi));
128 for (i = 0; i < vec_len (cm->minis); i++)
130 my_minis = cm->minis[i];
136 if (index < vec_len (cm->value_at_last_clear))
137 cm->value_at_last_clear[index] = 0;
140 /* Combined counters hold both packets and byte differences. */
141 /* Maxi-packet/byte counter. */
148 vlib_counter_add (vlib_counter_t * a, vlib_counter_t * b)
150 a->packets += b->packets;
151 a->bytes += b->bytes;
155 vlib_counter_sub (vlib_counter_t * a, vlib_counter_t * b)
157 ASSERT (a->packets >= b->packets);
158 ASSERT (a->bytes >= b->bytes);
159 a->packets -= b->packets;
160 a->bytes -= b->bytes;
164 vlib_counter_zero (vlib_counter_t * a)
166 a->packets = a->bytes = 0;
169 /* Micro-counter: 16 bits of packets and 16 bits of byte difference. */
175 /* The average packet size hack doesn't work in a multi-core config */
177 } vlib_mini_counter_t;
181 /* Compact counters that (rarely) can overflow. */
182 vlib_mini_counter_t **minis;
184 /* Counters to hold overflow. */
185 vlib_counter_t *maxi;
187 /* Debug counters for testing. */
188 vlib_counter_t *debug;
190 /* Counter values as of last clear. */
191 vlib_counter_t *value_at_last_clear;
193 /* Counter values as of last serialize. */
194 vlib_counter_t *value_at_last_serialize;
196 /* Last counter index serialized incrementally. */
197 u32 last_incremental_serialize_index;
199 /* Average packet sizes used in mini-counter byte differences. */
202 /* Current summed packets and bytes for average computation. */
203 u32 ave_packets, ave_bytes;
208 } vlib_combined_counter_main_t;
210 void vlib_clear_simple_counters (vlib_simple_counter_main_t * cm);
211 void vlib_clear_combined_counters (vlib_combined_counter_main_t * cm);
214 vlib_increment_combined_counter (vlib_combined_counter_main_t * cm,
217 u32 packet_increment, u32 byte_increment)
219 vlib_mini_counter_t *my_minis, *mini;
220 u32 old_packets, new_packets;
221 i32 old_bytes, new_bytes;
223 /* Use this CPU's mini counter array */
224 my_minis = cm->minis[cpu_index];
226 mini = vec_elt_at_index (my_minis, index);
227 old_packets = mini->packets;
228 old_bytes = mini->bytes;
230 new_packets = old_packets + packet_increment;
231 new_bytes = old_bytes + byte_increment;
233 mini->packets = new_packets;
234 mini->bytes = new_bytes;
236 /* Bytes always overflow before packets.. */
237 if (PREDICT_FALSE (mini->bytes != new_bytes))
239 vlib_counter_t *maxi = vec_elt_at_index (cm->maxi, index);
241 __sync_fetch_and_add (&maxi->packets, new_packets);
242 __sync_fetch_and_add (&maxi->bytes, new_bytes);
249 /* This is never done in the speed path */
251 vlib_get_combined_counter (vlib_combined_counter_main_t * cm,
252 u32 index, vlib_counter_t * result)
254 vlib_mini_counter_t *my_minis, *mini;
255 vlib_counter_t *maxi;
261 for (i = 0; i < vec_len (cm->minis); i++)
263 my_minis = cm->minis[i];
265 mini = vec_elt_at_index (my_minis, index);
266 result->packets += mini->packets;
267 result->bytes += mini->bytes;
270 maxi = vec_elt_at_index (cm->maxi, index);
271 result->packets += maxi->packets;
272 result->bytes += maxi->bytes;
274 if (index < vec_len (cm->value_at_last_clear))
275 vlib_counter_sub (result, &cm->value_at_last_clear[index]);
279 vlib_zero_combined_counter (vlib_combined_counter_main_t * cm, u32 index)
281 vlib_mini_counter_t *mini, *my_minis;
284 for (i = 0; i < vec_len (cm->minis); i++)
286 my_minis = cm->minis[i];
288 mini = vec_elt_at_index (my_minis, index);
293 vlib_counter_zero (&cm->maxi[index]);
294 if (index < vec_len (cm->value_at_last_clear))
295 vlib_counter_zero (&cm->value_at_last_clear[index]);
298 void vlib_validate_simple_counter (vlib_simple_counter_main_t * cm,
300 void vlib_validate_combined_counter (vlib_combined_counter_main_t * cm,
303 /* Number of simple/combined counters allocated. */
304 #define vlib_counter_len(cm) vec_len((cm)->maxi)
306 serialize_function_t serialize_vlib_simple_counter_main,
307 unserialize_vlib_simple_counter_main;
308 serialize_function_t serialize_vlib_combined_counter_main,
309 unserialize_vlib_combined_counter_main;
311 #endif /* included_vlib_counter_h */
314 * fd.io coding-style-patch-verification: ON
317 * eval: (c-set-style "gnu")