308 lines
8.9 KiB
Python
308 lines
8.9 KiB
Python
# sfputil.py
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#
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# Platform-specific SFP transceiver interface for SONiC
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#
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try:
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import time
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import string
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from ctypes import create_string_buffer
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from sonic_sfp.sfputilbase import SfpUtilBase
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except ImportError as e:
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raise ImportError("%s - required module not found" % str(e))
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SFP_STATUS_INSERTED = '1'
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SFP_STATUS_REMOVED = '0'
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class SfpUtil(SfpUtilBase):
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"""Platform-specific SfpUtil class"""
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PORT_START = 49
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PORT_END = 72
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PORTS_IN_BLOCK = 72
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_port_to_eeprom_mapping = {}
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_port_to_i2c_mapping = {
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49: 28, #QSFP49
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50: 28,
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51: 28,
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52: 28,
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53: 29, #QSFP50
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54: 29,
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55: 29,
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56: 29,
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57: 26, #QSFP51
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58: 26,
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59: 26,
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60: 26,
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61: 30, #QSFP52
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62: 30,
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63: 30,
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64: 30,
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65: 31, #QSFP53
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66: 31,
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67: 31,
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68: 31,
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69: 27, #QSFP54
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70: 27,
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71: 27,
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72: 27,
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}
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@property
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def port_start(self):
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return self.PORT_START
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@property
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def port_end(self):
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return self.PORT_END
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@property
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def qsfp_port_start(self):
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return self.PORT_START
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@property
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def qsfp_port_end(self):
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return self.PORT_END
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@property
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def qsfp_ports(self):
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return range(self.PORT_START, self.PORTS_IN_BLOCK + 1)
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@property
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def port_to_eeprom_mapping(self):
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return self._port_to_eeprom_mapping
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def __init__(self):
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eeprom_path = '/sys/bus/i2c/devices/{0}-0050/eeprom'
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for x in range(self.port_start, self.port_end+1):
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self.port_to_eeprom_mapping[x] = eeprom_path.format(
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self._port_to_i2c_mapping[x])
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SfpUtilBase.__init__(self)
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# For port 49~54 are QSFP, here presumed they're all split to 4 lanes.
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def get_cage_num(self, port_num):
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cage_num = port_num
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if (port_num >= self.PORT_START):
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cage_num = (port_num - self.PORT_START)/4
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cage_num = cage_num + self.PORT_START
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return cage_num
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def get_presence(self, port_num):
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# Check for invalid port_num
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if port_num < self.port_start or port_num > self.port_end:
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return False
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cage_num = self.get_cage_num(port_num)
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path = "/sys/bus/i2c/devices/3-0062/module_present_{0}"
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port_ps = path.format(cage_num)
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try:
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val_file = open(port_ps)
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except IOError as e:
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print "Error: unable to open file: %s" % str(e)
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return False
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content = val_file.readline().rstrip()
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val_file.close()
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# content is a string, either "0" or "1"
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if content == "1":
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return True
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return False
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def get_low_power_mode_cpld(self, port_num):
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if port_num < self.qsfp_port_start or port_num > self.qsfp_port_end:
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return False
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cage_num = self.get_cage_num(port_num)
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path = "/sys/bus/i2c/devices/3-0062/module_lpmode_{0}"
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lp_mode_path = path.format(cage_num)
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try:
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val_file = open(lp_mode_path)
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except IOError as e:
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print "Error: unable to open file: %s" % str(e)
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return False
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content = val_file.readline().rstrip()
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val_file.close()
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# content is a string, either "0" or "1"
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if content == "1":
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return True
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return False
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def get_low_power_mode(self, port_num):
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if port_num < self.qsfp_port_start or port_num > self.qsfp_port_end:
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return False
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if not self.get_presence(port_num):
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return False
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try:
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eeprom = None
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eeprom = open(self.port_to_eeprom_mapping[port_num], mode="rb", buffering=0)
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eeprom.seek(93)
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lpmode = ord(eeprom.read(1))
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if not (lpmode & 0x1): # 'Power override' bit is 0
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return self.get_low_power_mode_cpld(port_num)
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else:
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if ((lpmode & 0x2) == 0x2):
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return True # Low Power Mode if "Power set" bit is 1
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else:
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return False # High Power Mode if "Power set" bit is 0
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except IOError as e:
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print "Error: unable to open file: %s" % str(e)
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return False
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finally:
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if eeprom is not None:
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eeprom.close()
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time.sleep(0.01)
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def set_low_power_mode(self, port_num, lpmode):
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if port_num < self.qsfp_port_start or port_num > self.qsfp_port_end:
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return False
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try:
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eeprom = None
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if not self.get_presence(port_num):
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return False # Port is not present, unable to set the eeprom
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# Fill in write buffer
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regval = 0x3 if lpmode else 0x1 # 0x3:Low Power Mode, 0x1:High Power Mode
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buffer = create_string_buffer(1)
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buffer[0] = chr(regval)
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# Write to eeprom
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eeprom = open(self.port_to_eeprom_mapping[port_num], mode="r+b", buffering=0)
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eeprom.seek(93)
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eeprom.write(buffer[0])
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return True
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except IOError as e:
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print "Error: unable to open file: %s" % str(e)
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return False
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finally:
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if eeprom is not None:
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eeprom.close()
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time.sleep(0.01)
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def reset(self, port_num):
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if port_num < self.qsfp_port_start or port_num > self.qsfp_port_end:
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return False
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cage_num = self.get_cage_num(port_num)
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path = "/sys/bus/i2c/devices/3-0062/module_reset_{0}"
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port_ps = path.format(cage_num)
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try:
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reg_file = open(port_ps, mode="w", buffering=0)
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except IOError as e:
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print "Error: unable to open file: %s" % str(e)
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return False
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#toggle reset
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reg_file.seek(0)
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reg_file.write('0')
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time.sleep(1)
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reg_file.seek(0)
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reg_file.write('1')
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reg_file.close()
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return True
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@property
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def _get_presence_bitmap(self):
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bitmap = ""
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try:
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reg_file = open("/sys/bus/i2c/devices/3-0062/module_present_all")
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except IOError as e:
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print "Error: unable to open file: %s" % str(e)
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return False
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bitmap += reg_file.readline().rstrip() + " "
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reg_file.close()
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rev = bitmap.split(" ")
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rev.pop() # Remove the last useless character
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# Save port 49-54 into buffer
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tmp = rev.pop()
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# Insert port 1-48
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for i in range (0, 6):
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rev.append(hex(0)[2:])
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rev[i] = rev[i].zfill(2)
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# Expand port 49-54
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for i in range (0, 6):
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val = (int(tmp,16) >> i) & 0x1
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rev.append(hex(val)[2:])
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rev = "".join(rev[::-1])
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return int(rev,16)
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data = {'valid':0, 'present':0}
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def get_transceiver_change_event(self, timeout=0):
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start_time = time.time()
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port_dict = {}
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port = 0
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blocking = False
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if timeout == 0:
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blocking = True
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elif timeout > 0:
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timeout = timeout / float(1000) # Convert to secs
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else:
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print "get_transceiver_change_event:Invalid timeout value", timeout
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return False, {}
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end_time = start_time + timeout
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if start_time > end_time:
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print 'get_transceiver_change_event:' \
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'time wrap / invalid timeout value', timeout
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return False, {} # Time wrap or possibly incorrect timeout
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while timeout >= 0:
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# Check for OIR events and return updated port_dict
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reg_value = self._get_presence_bitmap
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changed_ports = self.data['present'] ^ reg_value
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if changed_ports:
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for port in range (self.port_start, self.port_end+1):
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# Mask off the bit corresponding to our port
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mask = (1 << (port - 1))
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if changed_ports & mask:
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if (reg_value & mask) == 0:
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port_dict[port] = SFP_STATUS_REMOVED
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else:
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port_dict[port] = SFP_STATUS_INSERTED
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# Update cache
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self.data['present'] = reg_value
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self.data['valid'] = 1
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return True, port_dict
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if blocking:
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time.sleep(1)
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else:
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timeout = end_time - time.time()
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if timeout >= 1:
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time.sleep(1) # We poll at 1 second granularity
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else:
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if timeout > 0:
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time.sleep(timeout)
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return True, {}
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print "get_transceiver_change_event: Should not reach here."
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return False, {}
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