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[mellanox]: Improve eeprom access reliability (#2756)

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* Improve eeprom access reliability

Co-Authored-By: andriymoroz-mlnx <c_andriym@mellanox.com>
This commit is contained in:
Andriy Moroz 2019-04-17 04:54:01 +03:00 committed by lguohan
parent a79f242e6c
commit 18e815171d
1 changed files with 22 additions and 1 deletions
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23
device/mellanox/x86_64-mlnx_msn2700-r0/plugins/eeprom.py
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@ -17,16 +17,37 @@ try:
import warnings import warnings
import os import os
import sys import sys
import syslog
from sonic_eeprom import eeprom_base from sonic_eeprom import eeprom_base
from sonic_eeprom import eeprom_tlvinfo from sonic_eeprom import eeprom_tlvinfo
import subprocess import subprocess
except ImportError, e: except ImportError, e:
raise ImportError (str(e) + "- required module not found") raise ImportError (str(e) + "- required module not found")
SYSLOG_IDENTIFIER = "eeprom.py"
EEPROM_SYMLINK = "/bsp/eeprom/sys_eeprom"
CACHE_FILE = "/var/cache/sonic/decode-syseeprom/syseeprom_cache"
def log_error(msg):
syslog.openlog(SYSLOG_IDENTIFIER)
syslog.syslog(syslog.LOG_ERR, msg)
syslog.closelog()
class board(eeprom_tlvinfo.TlvInfoDecoder): class board(eeprom_tlvinfo.TlvInfoDecoder):
_TLV_INFO_MAX_LEN = 256 _TLV_INFO_MAX_LEN = 256
RETRIES = 5
def __init__(self, name, path, cpld_root, ro): def __init__(self, name, path, cpld_root, ro):
self.eeprom_path = "/bsp/eeprom/sys_eeprom" for attempt in range(self.RETRIES):
if not (os.path.exists(EEPROM_SYMLINK) or os.path.isfile(CACHE_FILE)):
time.sleep(1)
else:
break
if not (os.path.exists(EEPROM_SYMLINK) or os.path.isfile(CACHE_FILE)):
log_error("Nowhere to read syseeprom from! No symlink or cache file found")
raise RuntimeError("No syseeprom symlink or cache file found")
self.eeprom_path = EEPROM_SYMLINK
super(board, self).__init__(self.eeprom_path, 0, '', True) super(board, self).__init__(self.eeprom_path, 0, '', True)