netdev - Re: No address after suspend/resume with 4.18

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Date:   Fri, 30 Nov 2018 15:34:10 -0800
From:   Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev@...r.kernel.org
Subject: Re: No address after suspend/resume with 4.18

On Fri, 2018-11-30 at 15:26 -0800, Stephen Hemminger wrote:
> On my box with Debian testing, I see a new problem with
> suspend/resume of wired network device.
> Using stock Debian kernel 4.18.0-2-amd64
> 
> After suspend/resume cycle, IP address is lost.
> 
> Device Info:
> $ /sbin/ethtool -i enp12s0
> driver: igb
> version: 5.4.0-k
> firmware-version:  0. 6-1
> expansion-rom-version: 
> bus-info: 0000:0c:00.0
> supports-statistics: yes
> supports-test: yes
> supports-eeprom-access: yes
> supports-register-dump: yes
> supports-priv-flags: yes
> 
> 
> $ lspci -v -s 0000:0c:00.0
> 0c:00.0 Ethernet controller: Intel Corporation I211 Gigabit Network
> Connection (rev 03)
> 	Subsystem: Gigabyte Technology Co., Ltd I211 Gigabit Network
> Connection
> 	Flags: bus master, fast devsel, latency 0, IRQ 17, NUMA node 0
> 	Memory at dfb00000 (32-bit, non-prefetchable) [size=128K]
> 	I/O ports at c000 [size=32]
> 	Memory at dfb20000 (32-bit, non-prefetchable) [size=16K]
> 	Capabilities: <access denied>
> 	Kernel driver in use: igb
> 	Kernel modules: igb
> 
> State before suspend:
> $ ip addr show dev enp12s0
> 4: enp12s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state
> UP group default qlen 1000
>     link/ether 1c:1b:0d:0a:4b:0e brd ff:ff:ff:ff:ff:ff
>     inet 192.168.1.18/24 brd 192.168.1.255 scope global enp12s0
>        valid_lft forever preferred_lft forever
> 
> State after resume:
> 
> $ ip addr show dev enp12s0
> 4: enp12s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state
> UP group default qlen 1000
>     link/ether 1c:1b:0d:0a:4b:0e brd ff:ff:ff:ff:ff:f
> 
> Doing ifdown/ifup which restarts the DHCP client does restore the
> address.
> 
> Not sure if this is a kernel issue with carrier handling, Intel
> driver issue, or DHCP client issue.

Thanks Stephen, I will have someone look into it.

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