No IPv6 addresses after resume (No buffer space available)

No IPv6 addresses after resume (No buffer space available)

[Adrian Knoth]

Hi!

I use suspend-to-RAM on my HP nx6325 laptop. I have three main
locations:

   - place A: IPv4 + IPv6
   - place B: IPv4 + IPv6
   - place C: IPv4 only

Suspending in place A and travelling to place B is no problem, I'm
always getting the local RAs, the right addresses a.s.o.

But once I've been in place C (no IPv6 there at this site), resuming in
A or B doesn't give me IPv6, I don't even get a link local address. Only
the loopback interface is left functional:

adi@chopin:~$ ls /proc/sys/net/ipv6/conf/
all  default  eth1  lo

chopin:/home/adi# ip -6 a s
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 
    inet6 ::1/128 scope host 
           valid_lft forever preferred_lft forever

eth0 is missing, also in /proc/sys/net/ipv6/conf (as shown above).

When I try to assign my link local address, it fails:

chopin:/home/adi# ip -6 a a fe80::0217:a4ff:fed7:a23e/64 scope link dev eth0
RTNETLINK answers: No buffer space available

It doesn't help to cycle the interface down and up. My current
workaround is to unload the NIC driver (tg3) and modprobe it again: 

[rmmod tg3 ; modprobe tg3]
chopin:/home/adi# ip -6 a s
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
15: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
    inet6 fe80::217:a4ff:fed7:a23e/64 scope link 
       valid_lft forever preferred_lft forever

[and a few moments later]
chopin:/home/adi# ip -6 a s
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
15: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
    inet6 2001:638:906:2:217:a4ff:fed7:a23e/64 scope global dynamic 
       valid_lft 2591987sec preferred_lft 604787sec
    inet6 fe80::217:a4ff:fed7:a23e/64 scope link 
       valid_lft forever preferred_lft forever


Hope you can identify the culprit.


TIA,

Cheerio


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