feat: Read PCIE AER counters class/net

Linux provides AER counters in the path /sys/class/net/<iface>/device/

This is split amoung 3 different files:
aer_dev_correctable
aer_dev_fatal
aer_dev_nonfatal

Signed-off-by: Diego Asturias <[email protected]>

sysfs/net_class_aer_test.go

@@ -1,5 +1,18 @@
-// Copyright (c) 2024 Arista Networks, Inc.  All rights reserved.
-// Arista Networks, Inc. Confidential and Proprietary.
+// Copyright 2024 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build linux
+// +build linux
 
 package sysfs
 

testdata/fixtures.ttar

@@ -13326,6 +13326,65 @@ Mode: 644
 Directory: fixtures/sys/devices/pci0000:00/0000:00:1f.6
 Mode: 755
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+Path: fixtures/sys/devices/pci0000:00/0000:00:1f.6/aer_dev_correctable
+Lines: 9
+RxErr 1
+BadTLP 2
+BadDLLP 3
+Rollover 4
+Timeout 5
+NonFatalErr 6
+CorrIntErr 7
+HeaderOF 8
+TOTAL_ERR_COR 9
+Mode: 644
+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+Path: fixtures/sys/devices/pci0000:00/0000:00:1f.6/aer_dev_fatal
+Lines: 19
+Undefined 10
+DLP 11
+SDES 12
+TLP 13
+FCP 14
+CmpltTO 15
+CmpltAbrt 16
+UnxCmplt 17
+RxOF 18
+MalfTLP 19
+ECRC 20
+UnsupReq 21
+ACSViol 22
+UncorrIntErr 23
+BlockedTLP 24
+AtomicOpBlocked 25
+TLPBlockedErr 26
+PoisonTLPBlocked 27
+TOTAL_ERR_FATAL 28
+Mode: 644
+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+Path: fixtures/sys/devices/pci0000:00/0000:00:1f.6/aer_dev_nonfatal
+Lines: 19
+Undefined 30
+DLP 31
+SDES 32
+TLP 33
+FCP 34
+CmpltTO 35
+CmpltAbrt 36
+UnxCmplt 37
+RxOF 38
+MalfTLP 39
+ECRC 40
+UnsupReq 41
+ACSViol 42
+UncorrIntErr 43
+BlockedTLP 44
+AtomicOpBlocked 45
+TLPBlockedErr 46
+PoisonTLPBlocked 47
+TOTAL_ERR_FATAL 48
+Mode: 644
+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Path: fixtures/sys/devices/pci0000:00/0000:00:1f.6/ari_enabled
 Lines: 1
 0