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1 | /* SPDX-License-Identifier: BSD-3-Clause |
2 | * Copyright(c) 2017 Intel Corporation | |
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3 | */ |
4 | ||
5 | #ifndef _RTE_LATENCYSTATS_H_ | |
6 | #define _RTE_LATENCYSTATS_H_ | |
7 | ||
8 | /** | |
9 | * @file | |
10 | * RTE latency stats | |
11 | * | |
12 | * library to provide application and flow based latency stats. | |
13 | */ | |
14 | ||
15 | #include <stdint.h> | |
16 | #include <rte_metrics.h> | |
17 | #include <rte_mbuf.h> | |
18 | ||
19 | #ifdef __cplusplus | |
20 | extern "C" { | |
21 | #endif | |
22 | ||
23 | /** | |
24 | * Note: This function pointer is for future flow based latency stats | |
25 | * implementation. | |
26 | * | |
9f95a23c | 27 | * Function type used for identifying flow types of a Rx packet. |
11fdf7f2 TL |
28 | * |
29 | * The callback function is called on Rx for each packet. | |
30 | * This function is used for flow based latency calculations. | |
31 | * | |
32 | * @param pkt | |
33 | * Packet that has to be identified with its flow types. | |
34 | * @param user_param | |
35 | * The arbitrary user parameter passed in by the application when | |
36 | * the callback was originally configured. | |
37 | * @return | |
38 | * The flow_mask, representing the multiple flow types of a packet. | |
39 | */ | |
40 | typedef uint16_t (*rte_latency_stats_flow_type_fn)(struct rte_mbuf *pkt, | |
41 | void *user_param); | |
42 | ||
43 | /** | |
44 | * Registers Rx/Tx callbacks for each active port, queue. | |
45 | * | |
46 | * @param samp_intvl | |
47 | * Sampling time period in nano seconds, at which packet | |
48 | * should be marked with time stamp. | |
49 | * @param user_cb | |
50 | * Note: This param is for future flow based latency stats | |
51 | * implementation. | |
52 | * User callback to be called to get flow types of a packet. | |
53 | * Used for flow based latency calculation. | |
54 | * If the value is NULL, global stats will be calculated, | |
55 | * else flow based latency stats will be calculated. | |
56 | * For now just pass on the NULL value to this param. | |
57 | * @return | |
58 | * -1 : On error | |
59 | * -ENOMEM: On error | |
60 | * 0 : On success | |
61 | */ | |
62 | int rte_latencystats_init(uint64_t samp_intvl, | |
63 | rte_latency_stats_flow_type_fn user_cb); | |
64 | ||
65 | /** | |
66 | * Calculates the latency and jitter values internally, exposing the updated | |
67 | * values via *rte_latencystats_get* or the rte_metrics API. | |
68 | * @return: | |
69 | * 0 : on Success | |
70 | * < 0 : Error in updating values. | |
71 | */ | |
72 | int32_t rte_latencystats_update(void); | |
73 | ||
74 | /** | |
75 | * Removes registered Rx/Tx callbacks for each active port, queue. | |
76 | * | |
77 | * @return | |
78 | * -1: On error | |
79 | * 0: On success | |
80 | */ | |
81 | int rte_latencystats_uninit(void); | |
82 | ||
83 | /** | |
84 | * Retrieve names of latency statistics | |
85 | * | |
86 | * @param names | |
87 | * Block of memory to insert names into. Must be at least size in capacity. | |
88 | * If set to NULL, function returns required capacity. | |
89 | * @param size | |
90 | * Capacity of latency stats names (number of names). | |
91 | * @return | |
92 | * - positive value lower or equal to size: success. The return value | |
93 | * is the number of entries filled in the stats table. | |
94 | * - positive value higher than size: error, the given statistics table | |
95 | * is too small. The return value corresponds to the size that should | |
96 | * be given to succeed. The entries in the table are not valid and | |
97 | * shall not be used by the caller. | |
98 | */ | |
99 | int rte_latencystats_get_names(struct rte_metric_name *names, | |
100 | uint16_t size); | |
101 | ||
102 | /** | |
103 | * Retrieve latency statistics. | |
104 | * | |
105 | * @param values | |
106 | * A pointer to a table of structure of type *rte_metric_value* | |
107 | * to be filled with latency statistics ids and values. | |
108 | * This parameter can be set to NULL if size is 0. | |
109 | * @param size | |
110 | * The size of the stats table, which should be large enough to store | |
111 | * all the latency stats. | |
112 | * @return | |
113 | * - positive value lower or equal to size: success. The return value | |
114 | * is the number of entries filled in the stats table. | |
115 | * - positive value higher than size: error, the given statistics table | |
116 | * is too small. The return value corresponds to the size that should | |
117 | * be given to succeed. The entries in the table are not valid and | |
118 | * shall not be used by the caller. | |
119 | * -ENOMEM: On failure. | |
120 | */ | |
121 | int rte_latencystats_get(struct rte_metric_value *values, | |
122 | uint16_t size); | |
123 | ||
124 | #ifdef __cplusplus | |
125 | } | |
126 | #endif | |
127 | ||
128 | #endif /* _RTE_LATENCYSTATS_H_ */ |