[pcied] Add PCIe AER stats collection (sonic-net#100)

In pcied, added support to collect AER stats belonging to different severities for AER supported PCIe devices and update it in STATE_DB.

The key used to represent a PCIE device for storing its AER stats in STATE_DB is of the format PCIE_DEVICE|<Bus>:<Dev>.<Fn>.
For every device, AER stats will be stored as key, value pairs where key is of the format <severity>|<AER Error type> and the device ID will be stored with key id.

HLD: sonic-net/SONiC#678, sonic-net/SONiC#720
Depends on: sonic-net/sonic-platform-common#144

sonic-pcied/scripts/pcied

@@ -8,13 +8,12 @@
 try:
     import os
     import signal
-    import subprocess
     import sys
     import threading
 
     import swsssdk
-    from sonic_py_common.daemon_base import DaemonBase
-    from sonic_py_common import device_info
+    from sonic_py_common import daemon_base, device_info
+    from swsscommon import swsscommon
 except ImportError as e:
     raise ImportError(str(e) + " - required module not found")
 
@@ -25,6 +24,7 @@ SYSLOG_IDENTIFIER = "pcied"
 
 PCIE_RESULT_REGEX = "PCIe Device Checking All Test"
 PCIE_TABLE_NAME = "PCIE_STATUS"
+PCIE_DEVICE_TABLE_NAME = "PCIE_DEVICE"
 
 PCIE_CONF_FILE = 'pcie.yaml'
 
@@ -36,7 +36,7 @@ REDIS_HOSTIP = "127.0.0.1"
 #
 
 
-class DaemonPcied(DaemonBase):
+class DaemonPcied(daemon_base.DaemonBase):
     def __init__(self, log_identifier):
         super(DaemonPcied, self).__init__(log_identifier)
 
@@ -52,6 +52,31 @@ class DaemonPcied(DaemonBase):
 
         self.state_db = swsssdk.SonicV2Connector(host=REDIS_HOSTIP)
         self.state_db.connect("STATE_DB")
+        state_db = daemon_base.db_connect("STATE_DB")
+        self.device_table = swsscommon.Table(state_db, PCIE_DEVICE_TABLE_NAME)
+
+    # Load AER-fields into STATEDB
+    def update_aer_to_statedb(self, device_name, aer_stats):
+
+        aer_fields = {}
+
+        for field, value in aer_stats['correctable'].items():
+            correctable_field = "correctable|" + field
+            aer_fields[correctable_field] = value
+
+        for field, value in aer_stats['fatal'].items():
+            fatal_field = "fatal|" + field
+            aer_fields[fatal_field] = value
+
+        for field, value in aer_stats['non_fatal'].items():
+            non_fatal_field = "non_fatal|" + field
+            aer_fields[non_fatal_field] = value
+
+        if aer_fields:
+            formatted_fields = swsscommon.FieldValuePairs(list(aer_fields.items()))
+            self.device_table.set(device_name, formatted_fields)
+        else:
+            self.log_debug("PCIe device {} has no AER attriutes".format(device_name))
 
     # Check the PCIe devices
     def check_pcie_devices(self):
@@ -84,6 +109,24 @@ class DaemonPcied(DaemonBase):
             self.update_state_db("PCIE_DEVICES", "status", "PASSED")
             self.log_info("PCIe device status check : PASSED")
 
+        # update AER-attributes to DB
+        for item in resultInfo:
+            if item["result"] == "Failed":
+                continue
+
+            Bus = int(item["bus"], 16)
+            Dev = int(item["dev"], 16)
+            Fn = int(item["fn"], 16)
+
+            device_name = "%02x:%02x.%d" % (Bus, Dev, Fn)
+            dev_id_path = '/sys/bus/pci/devices/0000:%s/device' % device_name
+            with open(dev_id_path, 'r') as fd:
+                Id = fd.read().strip()
+
+            self.device_table.set(device_name, [('id', Id)])
+            aer_stats = platform_pcieutil.get_pcie_aer_stats(bus=Bus, device=Dev, func=Fn)
+            self.update_aer_to_statedb(device_name, aer_stats)
+
     def read_state_db(self, key1, key2):
         return self.state_db.get('STATE_DB', key1, key2)