1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
/*-
* BSD LICENSE
*
* Copyright(c) 2010-2017 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "ethdev_profile.h"
/**
* This conditional block enables RX queues profiling by tracking wasted
* iterations, i.e. iterations which yielded no RX packets. Profiling is
* performed using the Instrumentation and Tracing Technology (ITT) API,
* employed by the Intel (R) VTune (TM) Amplifier.
*/
#ifdef RTE_ETHDEV_PROFILE_ITT_WASTED_RX_ITERATIONS
#include <ittnotify.h>
#define ITT_MAX_NAME_LEN (100)
/**
* Auxiliary ITT structure belonging to Ethernet device and using to:
* - track RX queue state to determine whether it is wasting loop iterations
* - begin or end ITT task using task domain and task name (handle)
*/
struct itt_profile_rx_data {
/**
* ITT domains for each queue.
*/
__itt_domain *domains[RTE_MAX_QUEUES_PER_PORT];
/**
* ITT task names for each queue.
*/
__itt_string_handle *handles[RTE_MAX_QUEUES_PER_PORT];
/**
* Flags indicating the queues state. Possible values:
* 1 - queue is wasting iterations,
* 0 - otherwise.
*/
uint8_t queue_state[RTE_MAX_QUEUES_PER_PORT];
};
/**
* The pool of *itt_profile_rx_data* structures.
*/
struct itt_profile_rx_data itt_rx_data[RTE_MAX_ETHPORTS];
/**
* This callback function manages ITT tasks collection on given port and queue.
* It must be registered with rte_eth_add_rx_callback() to be called from
* rte_eth_rx_burst(). To find more comments see rte_rx_callback_fn function
* type declaration.
*/
static uint16_t
collect_itt_rx_burst_cb(uint16_t port_id, uint16_t queue_id,
__rte_unused struct rte_mbuf *pkts[], uint16_t nb_pkts,
__rte_unused uint16_t max_pkts, __rte_unused void *user_param)
{
if (unlikely(nb_pkts == 0)) {
if (!itt_rx_data[port_id].queue_state[queue_id]) {
__itt_task_begin(
itt_rx_data[port_id].domains[queue_id],
__itt_null, __itt_null,
itt_rx_data[port_id].handles[queue_id]);
itt_rx_data[port_id].queue_state[queue_id] = 1;
}
} else {
if (unlikely(itt_rx_data[port_id].queue_state[queue_id])) {
__itt_task_end(
itt_rx_data[port_id].domains[queue_id]);
itt_rx_data[port_id].queue_state[queue_id] = 0;
}
}
return nb_pkts;
}
/**
* Initialization of itt_profile_rx_data for a given Ethernet device.
* This function must be invoked when ethernet device is being configured.
* Result will be stored in the global array *itt_rx_data*.
*
* @param port_id
* The port identifier of the Ethernet device.
* @param port_name
* The name of the Ethernet device.
* @param rx_queue_num
* The number of RX queues on specified port.
*
* @return
* - On success, zero.
* - On failure, a negative value.
*/
static inline int
itt_profile_rx_init(uint16_t port_id, char *port_name, uint8_t rx_queue_num)
{
uint16_t q_id;
for (q_id = 0; q_id < rx_queue_num; ++q_id) {
char domain_name[ITT_MAX_NAME_LEN];
snprintf(domain_name, sizeof(domain_name),
"RXBurst.WastedIterations.Port_%s.Queue_%d",
port_name, q_id);
itt_rx_data[port_id].domains[q_id]
= __itt_domain_create(domain_name);
char task_name[ITT_MAX_NAME_LEN];
snprintf(task_name, sizeof(task_name),
"port id: %d; queue id: %d",
port_id, q_id);
itt_rx_data[port_id].handles[q_id]
= __itt_string_handle_create(task_name);
itt_rx_data[port_id].queue_state[q_id] = 0;
if (!rte_eth_add_rx_callback(
port_id, q_id, collect_itt_rx_burst_cb, NULL)) {
return -rte_errno;
}
}
return 0;
}
#endif /* RTE_ETHDEV_PROFILE_ITT_WASTED_RX_ITERATIONS */
int
__rte_eth_profile_rx_init(__rte_unused uint16_t port_id,
__rte_unused struct rte_eth_dev *dev)
{
#ifdef RTE_ETHDEV_PROFILE_ITT_WASTED_RX_ITERATIONS
return itt_profile_rx_init(
port_id, dev->data->name, dev->data->nb_rx_queues);
#endif
return 0;
}
|
