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
|
//
// Copyright © 2019 Arm Ltd. All rights reserved.
// SPDX-License-Identifier: MIT
//
#include "SocketProfilingConnection.hpp"
#include <cerrno>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <string>
namespace armnn
{
namespace profiling
{
SocketProfilingConnection::SocketProfilingConnection()
{
memset(m_Socket, 0, sizeof(m_Socket));
// Note: we're using Linux specific SOCK_CLOEXEC flag.
m_Socket[0].fd = socket(PF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0);
if (m_Socket[0].fd == -1)
{
throw armnn::RuntimeException(std::string("Socket construction failed: ") + strerror(errno));
}
// Connect to the named unix domain socket.
struct sockaddr_un server{};
memset(&server, 0, sizeof(sockaddr_un));
// As m_GatorNamespace begins with a null character we need to ignore that when getting its length.
memcpy(server.sun_path, m_GatorNamespace, strlen(m_GatorNamespace + 1) + 1);
server.sun_family = AF_UNIX;
if (0 != connect(m_Socket[0].fd, reinterpret_cast<const sockaddr*>(&server), sizeof(sockaddr_un)))
{
close(m_Socket[0].fd);
throw armnn::RuntimeException(std::string("Cannot connect to stream socket: ") + strerror(errno));
}
// Our socket will only be interested in polling reads.
m_Socket[0].events = POLLIN;
// Make the socket non blocking.
const int currentFlags = fcntl(m_Socket[0].fd, F_GETFL);
if (0 != fcntl(m_Socket[0].fd, F_SETFL, currentFlags | O_NONBLOCK))
{
close(m_Socket[0].fd);
throw armnn::RuntimeException(std::string("Failed to set socket as non blocking: ") + strerror(errno));
}
}
bool SocketProfilingConnection::IsOpen() const
{
return m_Socket[0].fd > 0;
}
void SocketProfilingConnection::Close()
{
if (close(m_Socket[0].fd) != 0)
{
throw armnn::RuntimeException(std::string("Cannot close stream socket: ") + strerror(errno));
}
memset(m_Socket, 0, sizeof(m_Socket));
}
bool SocketProfilingConnection::WritePacket(const unsigned char* buffer, uint32_t length)
{
if (buffer == nullptr || length == 0)
{
return false;
}
return write(m_Socket[0].fd, buffer, length) != -1;
}
Packet SocketProfilingConnection::ReadPacket(uint32_t timeout)
{
// Is there currently at least a headers worth of data waiting to be read?
int bytes_available;
ioctl(m_Socket[0].fd, FIONREAD, &bytes_available);
if (bytes_available >= 8)
{
// Yes there is. Read it:
return ReceivePacket();
}
else
{
// Poll for data on the socket or until timeout occurs
int pollResult = poll(m_Socket, 1, static_cast<int>(timeout));
switch (pollResult)
{
case -1: // Error
throw armnn::RuntimeException(std::string("Read failure from socket: ") + strerror(errno));
case 0: // Timeout
throw TimeoutException("Timeout while reading from socket");
default: // Normal poll return but it could still contain an error signal
// Check if the socket reported an error
if (m_Socket[0].revents & (POLLNVAL | POLLERR | POLLHUP))
{
throw armnn::RuntimeException(std::string("Socket reported an error: ") + strerror(errno));
}
// Check if there is data to read
if (!(m_Socket[0].revents & (POLLIN)))
{
// This is a very odd case. The file descriptor was woken up but no data was written.
throw armnn::RuntimeException("Poll resulted in : no data to read");
}
return ReceivePacket();
}
}
}
Packet SocketProfilingConnection::ReceivePacket()
{
char header[8] = {};
if (8 != recv(m_Socket[0].fd, &header, sizeof(header), 0))
{
// What do we do here if there's not a valid 8 byte header to read?
throw armnn::RuntimeException("The received packet did not contains a valid MIPE header");
}
// stream_metadata_identifier is the first 4 bytes
uint32_t metadataIdentifier = 0;
std::memcpy(&metadataIdentifier, header, sizeof(metadataIdentifier));
// data_length is the next 4 bytes
uint32_t dataLength = 0;
std::memcpy(&dataLength, header + 4u, sizeof(dataLength));
std::unique_ptr<unsigned char[]> packetData;
if (dataLength > 0)
{
packetData = std::make_unique<unsigned char[]>(dataLength);
ssize_t receivedLength = recv(m_Socket[0].fd, packetData.get(), dataLength, 0);
if (receivedLength < 0)
{
throw armnn::RuntimeException(std::string("Error occured on recv: ") + strerror(errno));
}
if (dataLength != static_cast<uint32_t>(receivedLength))
{
// What do we do here if we can't read in a full packet?
throw armnn::RuntimeException("Invalid MIPE packet");
}
}
return Packet(metadataIdentifier, dataLength, packetData);
}
} // namespace profiling
} // namespace armnn
|
