[sfputil]: Add support for SFP presence, low-power mode and reset (#877)

- Update sfputil plugins for Dell FORCE10-S6000, Arista 7050-QX-32, 7050-QX-32-S

device/arista/x86_64-arista_7050_qx32/plugins/sfputil.py

@@ -1,9 +1,12 @@
-#!/usr/bin/env python
+# sfputil.py
+#
+# Platform-specific SFP transceiver interface for SONiC
+#
 
 try:
     import arista.utils.sonic_sfputil as arista_sfputil
-except ImportError, e:
-    raise ImportError (str(e) + "- required module not found")
+except ImportError as e:
+    raise ImportError("%s - required module not found" % str(e))
 
 
-sfputil = arista_sfputil.getSfpUtil()
+SfpUtil = arista_sfputil.getSfpUtil()

device/arista/x86_64-arista_7050_qx32s/plugins/sfputil.py

@@ -1,9 +1,12 @@
-#!/usr/bin/env python
+# sfputil.py
+#
+# Platform-specific SFP transceiver interface for SONiC
+#
 
 try:
     import arista.utils.sonic_sfputil as arista_sfputil
-except ImportError, e:
-    raise ImportError (str(e) + "- required module not found")
+except ImportError as e:
+    raise ImportError("%s - required module not found" % str(e))
 
 
-sfputil = arista_sfputil.getSfpUtil()
+SfpUtil = arista_sfputil.getSfpUtil()

device/dell/x86_64-dell_s6000_s1220-r0/plugins/sfputil.py

@@ -1,27 +1,175 @@
-#!/usr/bin/env python
+# sfputil.py
+#
+# Platform-specific SFP transceiver interface for SONiC
+#
 
 try:
-    from sonic_sfp.sfputilbase import sfputilbase
-except ImportError, e:
-    raise ImportError (str(e) + "- required module not found")
+    import time
+    from sonic_sfp.sfputilbase import SfpUtilBase
+except ImportError as e:
+    raise ImportError("%s - required module not found" % str(e))
 
 
-class sfputil(sfputilbase):
-    """Platform specific sfputil class"""
+class SfpUtil(SfpUtilBase):
+    """Platform-specific SfpUtil class"""
 
-    port_start = 0
-    port_end = 31
-    ports_in_block = 32
+    PORT_START = 0
+    PORT_END = 31
+    PORTS_IN_BLOCK = 32
 
-    eeprom_offset = 20
+    EEPROM_OFFSET = 20
 
-    port_to_eeprom_mapping = {}
+    _port_to_eeprom_mapping = {}
 
-    _qsfp_ports = range(0, ports_in_block + 1)
+    @property
+    def port_start(self):
+        return self.PORT_START
+
+    @property
+    def port_end(self):
+        return self.PORT_END
+
+    @property
+    def qsfp_ports(self):
+        return range(0, self.PORTS_IN_BLOCK + 1)
+
+    @property
+    def port_to_eeprom_mapping(self):
+        return self._port_to_eeprom_mapping
+
+    def __init__(self):
+        eeprom_path = "/sys/class/i2c-adapter/i2c-{0}/{0}-0050/eeprom"
 
-    def __init__(self, port_num):
-        # Override port_to_eeprom_mapping for class initialization
-        eeprom_path = '/sys/class/i2c-adapter/i2c-{0}/{0}-0050/eeprom'
         for x in range(0, self.port_end + 1):
-            self.port_to_eeprom_mapping[x] = eeprom_path.format(x + self.eeprom_offset)
-        sfputilbase.__init__(self, port_num)
+            self._port_to_eeprom_mapping[x] = eeprom_path.format(x + self.EEPROM_OFFSET)
+
+        SfpUtilBase.__init__(self)
+
+    def get_presence(self, port_num):
+        # Check for invalid port_num
+        if port_num < self.port_start or port_num > self.port_end:
+            return False
+
+        try:
+            reg_file = open("/sys/devices/platform/dell-s6000-cpld.0/qsfp_modprs")
+        except IOError as e:
+            print "Error: unable to open file: %s" % str(e)
+            return False
+
+        content = reg_file.readline().rstrip()
+
+        # content is a string containing the hex representation of the register
+        reg_value = int(content, 16)
+
+        # Mask off the bit corresponding to our port
+        mask = (1 << port_num)
+
+        # ModPrsL is active low
+        if reg_value & mask == 0:
+            return True
+
+        return False
+
+    def get_low_power_mode(self, port_num):
+        # Check for invalid port_num
+        if port_num < self.port_start or port_num > self.port_end:
+            return False
+
+        try:
+            reg_file = open("/sys/devices/platform/dell-s6000-cpld.0/qsfp_lpmode")
+        except IOError as e:
+            print "Error: unable to open file: %s" % str(e)
+
+        content = reg_file.readline().rstrip()
+
+        # content is a string containing the hex representation of the register
+        reg_value = int(content, 16)
+
+        # Mask off the bit corresponding to our port
+        mask = (1 << port_num)
+
+        # LPMode is active high
+        if reg_value & mask == 0:
+            return False
+
+        return True
+
+    def set_low_power_mode(self, port_num, lpmode):
+        # Check for invalid port_num
+        if port_num < self.port_start or port_num > self.port_end:
+            return False
+
+        try:
+            reg_file = open("/sys/devices/platform/dell-s6000-cpld.0/qsfp_lpmode", "r+")
+        except IOError as e:
+            print "Error: unable to open file: %s" % str(e)
+            return False
+
+        content = reg_file.readline().rstrip()
+
+        # content is a string containing the hex representation of the register
+        reg_value = int(content, 16)
+
+        # Mask off the bit corresponding to our port
+        mask = (1 << port_num)
+
+        # LPMode is active high; set or clear the bit accordingly
+        if lpmode is True:
+            reg_value = reg_value | mask
+        else:
+            reg_value = reg_value & ~mask
+
+        # Convert our register value back to a hex string and write back
+        content = hex(reg_value)
+
+        reg_file.seek(0)
+        reg_file.write(content)
+        reg_file.close()
+
+        return True
+
+    def reset(self, port_num):
+        QSFP_RESET_REGISTER_DEVICE_FILE = "/sys/devices/platform/dell-s6000-cpld.0/qsfp_reset"
+
+        # Check for invalid port_num
+        if port_num < self.port_start or port_num > self.port_end:
+            return False
+
+        try:
+            reg_file = open(QSFP_RESET_REGISTER_DEVICE_FILE, "r+")
+        except IOError as e:
+            print "Error: unable to open file: %s" % str(e)
+            return False
+
+        content = reg_file.readline().rstrip()
+
+        # File content is a string containing the hex representation of the register
+        reg_value = int(content, 16)
+
+        # Mask off the bit corresponding to our port
+        mask = (1 << port_num)
+
+        # ResetL is active low
+        reg_value = reg_value & ~mask
+
+        # Convert our register value back to a hex string and write back
+        reg_file.seek(0)
+        reg_file.write(hex(reg_value))
+        reg_file.close()
+
+        # Sleep 1 second to allow it to settle
+        time.sleep(1)
+
+        # Flip the bit back high and write back to the register to take port out of reset
+        try:
+            reg_file = open(QSFP_RESET_REGISTER_DEVICE_FILE, "w")
+        except IOError as e:
+            print "Error: unable to open file: %s" % str(e)
+            return False
+
+        reg_value = reg_value | mask
+        reg_file.seek(0)
+        reg_file.write(hex(reg_value))
+        reg_file.close()
+
+        return True

files/image_config/sudoers/sudoers

@@ -25,7 +25,7 @@ Cmnd_Alias      READ_ONLY_CMDS = /usr/bin/decode-syseeprom, \
                                  /usr/bin/lldpctl, \
                                  /usr/bin/lldpshow, \
                                  /usr/bin/sensors, \
-                                 /usr/bin/sfputil, \
+                                 /usr/bin/sfputil show *, \
                                  /usr/bin/vtysh -c show *, \
                                  /bin/cat /var/log/syslog, \
                                  /usr/bin/tail -f /var/log/syslog