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
165
166
167
168
169
170
171
172
|
import os
import select
import time
from array import array
from ..msgs import create_message, encode_message, decode_message
from ..errors import IpmiTimeoutError
from ..logger import log
from ..interfaces.ipmb import IpmbHeaderReq, checksum, rx_filter, encode_ipmb_msg
class IpmbDev(object):
"""This interface uses ipmb-dev-int linux driver."""
NAME = 'ipmbdev'
def __init__(self, slave_address=0x20, port='/dev/ipmb-0'):
# TODO: slave address is currently not defined here
self.slave_address = slave_address
self.timeout = 0.25
self.max_retries = 3
self.next_sequence_number = 0
self._dev = os.open(port, os.O_RDWR)
def establish_session(self, session):
# just remember session parameters here
self._session = session
def close_session(self):
os.close(self._dev)
def is_ipmc_accessible(self, target):
header = IpmbHeaderReq()
header.netfn = 6
header.rs_lun = 0
header.rs_sa = target.ipmb_address
header.rq_seq = self.next_sequence_number
header.rq_lun = 0
header.rq_sa = self.slave_address
header.cmdid = 1
self._send_raw(header, None)
self._receive_raw(header)
return True
def _inc_sequence_number(self):
self.next_sequence_number = (self.next_sequence_number + 1) % 64
@staticmethod
def _encode_ipmb_msg_req(header, cmd_data):
data = header.encode()
data.extend(cmd_data)
data.append(checksum(data[2:]))
return data
def _send_raw(self, header, raw_bytes):
raw_bytes = encode_ipmb_msg(header, raw_bytes)
i2c_addr = header.rs_sa >> 1
log().debug('I2C TX to %02Xh [%s]', i2c_addr,
' '.join(['%02x' % b for b in raw_bytes]))
os.write(self._dev, bytes([len(raw_bytes)]) + raw_bytes)
def _receive_raw(self, header):
start_time = time.time()
rsp_received = False
poll_returned_no_data = False
while not rsp_received:
timeout = self.timeout - (time.time() - start_time)
if timeout <= 0 or poll_returned_no_data:
raise IpmiTimeoutError()
r, w, e = select.select([self._dev], [], [], timeout)
if self._dev not in r:
poll_returned_no_data = True
continue
rx_data = os.read(self._dev, 256)
# ipmb-dev-int puts message length into first byte
assert rx_data[0] == len(rx_data) - 1
rx_data = rx_data[1:]
rx_data = array('B', rx_data)
log().debug('I2C RX from %02Xh [%s]', rx_data[3],
' '.join(['%02x' % c for c in rx_data]))
rsp_received = rx_filter(header, rx_data)
rx_data = rx_data[1:]
return rx_data
def _send_and_receive(self, target, lun, netfn, cmdid, payload):
"""Send and receive data using ipmb-dev-int interface.
target:
lun:
netfn:
cmdid:
payload: IPMI message payload as bytestring
Returns the received data as bytestring
"""
self._inc_sequence_number()
# assemble IPMB header
header = IpmbHeaderReq()
header.netfn = netfn
header.rs_lun = lun
header.rs_sa = target.ipmb_address
header.rq_seq = self.next_sequence_number
header.rq_lun = 0
header.rq_sa = self.slave_address
header.cmdid = cmdid
retries = 0
while retries < self.max_retries:
try:
self._send_raw(header, payload)
rx_data = self._receive_raw(header)
break
except IpmiTimeoutError:
pass
except IOError:
pass
retries += 1
time.sleep(retries * 0.2)
else:
raise IpmiTimeoutError()
return rx_data[5:-1]
def send_and_receive_raw(self, target, lun, netfn, raw_bytes):
"""Interface function to send and receive raw message.
target: IPMI target
lun: logical unit number
netfn: network function
raw_bytes: RAW bytes as bytestring
Returns the IPMI message response bytestring.
"""
return self._send_and_receive(target=target,
lun=lun,
netfn=netfn,
cmdid=array('B', raw_bytes)[0],
payload=raw_bytes[1:])
def send_and_receive(self, req):
"""Interface function to send and receive an IPMI message.
target: IPMI target
req: IPMI message request
Returns the IPMI message response.
"""
log().debug('IPMI Request [%s]', req)
rx_data = self._send_and_receive(target=req.target,
lun=req.lun,
netfn=req.netfn,
cmdid=req.cmdid,
payload=encode_message(req))
rsp = create_message(req.netfn + 1, req.cmdid, req.group_extension)
decode_message(rsp, rx_data)
log().debug('IPMI Response [%s])', rsp)
return rsp
|
