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wired network interface disabled !

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Hi,

My ethernet interface has been disabled, and I can't find the root cause. I think the issue happened while creating the bridge in the following tutorial while trying to enable KVM GPU passthrough: https://ycnrg.org/vga-passthrough-with-ovmf-vfio/

Any help appreciated.

Code:

cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04.2 LTS"
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04.2 LTS"

Code:

uname -a
Linux bumbara 4.4.0-72-generic #93-Ubuntu SMP Fri Mar 31 14:07:41 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

Code:

sudo lshw -c network
  *-network             
      description: Ethernet interface
      product: Intel Corporation
      vendor: Intel Corporation
      physical id: 0
      bus info: pci@0000:02:00.0
      logical name: wlp2s0
      version: 78
      serial: xx:xx:xx:xx:xx:xx
      width: 64 bits
      clock: 33MHz
      capabilities: pm msi pciexpress bus_master cap_list ethernet physical
      configuration: broadcast=yes driver=iwlwifi driverversion=4.4.0-72-generic firmware=22.361476.0 ip=192.168.1.181 latency=0 link=yes multicast=yes
      resources: irq:129 memory:edb00000-edb01fff
  *-network DISABLED
      description: Ethernet interface
      physical id: 2
      logical name: virbr0-nic
      serial: yy:yy:yy:yy:yy:yy
      size: 10Mbit/s
      capabilities: ethernet physical
      configuration: autonegotiation=off broadcast=yes driver=tun driverversion=1.6 duplex=full link=no multicast=yes port=twisted pair speed=10Mbit/s

Code:

lspci -nn | grep -i net
02:00.0 Network controller [0280]: Intel Corporation Device [8086:24fd] (rev 78)

Code:

ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: wlp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DORMANT group default qlen 1000
    link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff
3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT group default qlen 1000
    link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT group default qlen 1000
    link/ether 52:54:00:a0:4c:28 brd ff:ff:ff:ff:ff:ff

Code:

ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
      valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
      valid_lft forever preferred_lft forever
2: wlp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.181/24 brd 192.168.1.255 scope global dynamic wlp2s0
      valid_lft 42125sec preferred_lft 42125sec
    inet6 fe80::6f95:66d3:5498:12cf/64 scope link
      valid_lft forever preferred_lft forever
3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
    link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
      valid_lft forever preferred_lft forever
4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000
    link/ether 52:54:00:a0:4c:28 brd ff:ff:ff:ff:ff:ff

Code:

cat  /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback

I added the following to /etc/sysctl.conf:
Code:

# Enable IPv4 forwarding
net.ipv4.ip_forward=1 
net.ipv4.conf.all.rp_filter=1 
net.ipv4.icmp_echo_ignore_broadcasts=1 
net.ipv4.conf.default.proxy_arp=1

Code:

cat /etc/modules
pci_stub 
vfio 
vfio_iommu_type1 
vfio_pci 
vfio_virqfd 
kvm 
kvm_intel

I added the following to /etc/default/grub and run after sudo update-grub:
Code:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_iommu=on iommu=pt"
I added the following to /etc/initramfs-tools/modules and run after sudo update-initramfs -u:
Code:

pci_stub ids=8086:591b,10de:13b6
I had before persistent net rules to rename interfaces to wlan0 and eth0, but after the issue I disabled the rules.
Code:

cat /etc/udev/rules.d/70-persistent-net.rules
# PCI device 0x10ec:0x8xxxx (ethernet)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="yy:yy:yy:yy:yy:yy", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"

# PCI device 0x168c:0xyyy (wifi)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="xx:xx:xx:xx:xx:xx", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="wlan*", NAME="wlan0"

Code:

cat /etc/NetworkManager/NetworkManager.conf
[main]
plugins=ifupdown,keyfile,ofono
#dns=dnsmasq

[ifupdown]
managed=false

Code:

lsmod
Module                  Size  Used by
drbg                  32768  1
ansi_cprng            16384  0
ctr                    16384  3
ccm                    20480  3
rfcomm                69632  2
xt_CHECKSUM            16384  1
iptable_mangle        16384  1
ipt_MASQUERADE        16384  3
nf_nat_masquerade_ipv4    16384  1 ipt_MASQUERADE
iptable_nat            16384  1
nf_nat_ipv4            16384  1 iptable_nat
nf_nat                24576  2 nf_nat_ipv4,nf_nat_masquerade_ipv4
nf_conntrack_ipv4      16384  2
nf_defrag_ipv4        16384  1 nf_conntrack_ipv4
xt_conntrack          16384  1
nf_conntrack          106496  5 nf_nat,nf_nat_ipv4,xt_conntrack,nf_nat_masquerade_ipv4,nf_conntrack_ipv4
ipt_REJECT            16384  2
nf_reject_ipv4        16384  1 ipt_REJECT
xt_tcpudp              16384  6
bridge                126976  0
stp                    16384  1 bridge
llc                    16384  2 stp,bridge
ebtable_filter        16384  0
ebtables              36864  1 ebtable_filter
ip6table_filter        16384  0
ip6_tables            28672  1 ip6table_filter
iptable_filter        16384  1
ip_tables              24576  3 iptable_filter,iptable_mangle,iptable_nat
x_tables              36864  11 ip6table_filter,xt_CHECKSUM,ip_tables,xt_tcpudp,ipt_MASQUERADE,xt_conntrack,iptable_filter,ebtables,ipt_REJECT,iptable_mangle,ip6_tables
nvram                  16384  0
msr                    16384  0
cmac                  16384  2
uvcvideo              90112  0
videobuf2_vmalloc      16384  1 uvcvideo
videobuf2_memops      16384  1 videobuf2_vmalloc
videobuf2_v4l2        28672  1 uvcvideo
videobuf2_core        36864  2 uvcvideo,videobuf2_v4l2
v4l2_common            16384  1 videobuf2_v4l2
videodev              176128  4 uvcvideo,v4l2_common,videobuf2_core,videobuf2_v4l2
media                  24576  2 uvcvideo,videodev
btusb                  45056  0
btrtl                  16384  1 btusb
bbswitch              16384  0
bnep                  20480  2
hid_multitouch        20480  0
nls_iso8859_1          16384  1
arc4                  16384  2
iwlmvm                425984  0
snd_hda_codec_hdmi    49152  1
mac80211              700416  1 iwlmvm
dell_led              16384  1
i2c_designware_platform    16384  0
i2c_designware_core    20480  1 i2c_designware_platform
snd_hda_codec_realtek    90112  1
dell_wmi              16384  0
mxm_wmi                16384  0
snd_hda_codec_generic    73728  1 snd_hda_codec_realtek
dcdbas                16384  0
dell_smm_hwmon        16384  0
iwlwifi              315392  1 iwlmvm
snd_hda_intel          40960  3
snd_hda_codec        135168  4 snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_intel
rtsx_pci_ms            20480  0
memstick              20480  1 rtsx_pci_ms
cfg80211              589824  3 iwlwifi,mac80211,iwlmvm
snd_hda_core          90112  5 snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_codec,snd_hda_intel
snd_hwdep              16384  1 snd_hda_codec
snd_pcm              106496  4 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel,snd_hda_core
compat                16384  4 cfg80211,iwlwifi,mac80211,iwlmvm
x86_pkg_temp_thermal    16384  0
coretemp              16384  0
crct10dif_pclmul      16384  0
crc32_pclmul          16384  0
ghash_clmulni_intel    16384  0
snd_seq_midi          16384  0
snd_seq_midi_event    16384  1 snd_seq_midi
snd_rawmidi            32768  1 snd_seq_midi
aesni_intel          167936  8
snd_seq                69632  2 snd_seq_midi_event,snd_seq_midi
aes_x86_64            20480  1 aesni_intel
lrw                    16384  1 aesni_intel
gf128mul              16384  1 lrw
glue_helper            16384  1 aesni_intel
ablk_helper            16384  1 aesni_intel
cryptd                20480  3 ghash_clmulni_intel,aesni_intel,ablk_helper
snd_seq_device        16384  3 snd_seq,snd_rawmidi,snd_seq_midi
snd_timer              32768  2 snd_pcm,snd_seq
joydev                20480  0
input_leds            16384  0
snd                    81920  17 snd_hda_codec_realtek,snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_pcm,snd_seq,snd_rawmidi,snd_hda_codec_generic,snd_hda_codec,snd_hda_intel,snd_seq_device
serio_raw              16384  0
soundcore              16384  1 snd
mei_me                36864  0
shpchp                36864  0
idma64                20480  0
virt_dma              16384  1 idma64
mei                    98304  1 mei_me
processor_thermal_device    16384  0
intel_lpss_pci        16384  0
intel_soc_dts_iosf    16384  1 processor_thermal_device
hci_uart              77824  0
btqca                  16384  1 hci_uart
btbcm                  16384  2 btusb,hci_uart
btintel                16384  2 btusb,hci_uart
bluetooth            520192  31 bnep,btbcm,btqca,btrtl,btusb,hci_uart,rfcomm,btintel
dell_smo8800          16384  0
intel_lpss_acpi        16384  0
wmi                    20480  3 dell_led,dell_wmi,mxm_wmi
int3403_thermal        16384  0
intel_lpss            16384  2 intel_lpss_pci,intel_lpss_acpi
int340x_thermal_zone    16384  2 processor_thermal_device,int3403_thermal
int3400_thermal        16384  0
mac_hid                16384  0
intel_hid              16384  0
acpi_thermal_rel      16384  1 int3400_thermal
sparse_keymap          16384  2 dell_wmi,intel_hid
acpi_als              16384  0
kfifo_buf              16384  1 acpi_als
acpi_pad              24576  0
industrialio          61440  2 acpi_als,kfifo_buf
kvm_intel            172032  0
kvm                  544768  1 kvm_intel
vfio_pci              40960  0
vfio_virqfd            16384  1 vfio_pci
irqbypass              16384  2 kvm,vfio_pci
vfio_iommu_type1      20480  0
vfio                  28672  2 vfio_iommu_type1,vfio_pci
parport_pc            32768  0
ppdev                  20480  0
lp                    20480  0
parport                49152  3 lp,ppdev,parport_pc
autofs4                40960  2
btrfs                987136  0
raid10                49152  0
raid456              110592  0
async_raid6_recov      20480  1 raid456
async_memcpy          16384  2 raid456,async_raid6_recov
async_pq              16384  2 raid456,async_raid6_recov
async_xor              16384  3 async_pq,raid456,async_raid6_recov
async_tx              16384  5 async_pq,raid456,async_xor,async_memcpy,async_raid6_recov
xor                    24576  2 btrfs,async_xor
raid6_pq              102400  4 async_pq,raid456,btrfs,async_raid6_recov
libcrc32c              16384  1 raid456
raid1                  36864  0
raid0                  20480  0
multipath              16384  0
linear                16384  0
dm_mirror              24576  0
dm_region_hash        24576  1 dm_mirror
dm_log                20480  2 dm_region_hash,dm_mirror
pci_stub              16384  0
hid_logitech_hidpp    20480  0
hid_logitech_dj        20480  0
usbhid                49152  0
rtsx_pci_sdmmc        24576  0
i915_bpo            1302528  5
intel_ips              20480  1 i915_bpo
i2c_algo_bit          16384  1 i915_bpo
drm_kms_helper        155648  1 i915_bpo
psmouse              131072  0
syscopyarea            16384  1 drm_kms_helper
sysfillrect            16384  1 drm_kms_helper
sysimgblt              16384  1 drm_kms_helper
ahci                  36864  2
fb_sys_fops            16384  1 drm_kms_helper
rtsx_pci              53248  2 rtsx_pci_ms,rtsx_pci_sdmmc
libahci                32768  1 ahci
drm                  364544  6 i915_bpo,drm_kms_helper
i2c_hid                20480  0
hid                  118784  6 i2c_hid,hid_multitouch,usbhid,hid_logitech_dj,hid_logitech_hidpp
pinctrl_sunrisepoint    28672  0
video                  40960  2 i915_bpo,dell_wmi
pinctrl_intel          20480  1 pinctrl_sunrisepoint


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