Re: [Bugme-new] [Bug 11620] New: tun device's speed is set to ony 10mbps

Re: [Bugme-new] [Bug 11620] New: tun device's speed is set to ony 10mbps

[Andrew Morton]

(switched to email.  Please respond via emailed reply-to-all, not via the
bugzilla web interface).

On Mon, 22 Sep 2008 03:56:08 -0700 (PDT)
bugme-daemon@bugzilla.kernel.org wrote:

> http://bugzilla.kernel.org/show_bug.cgi?id=11620
> 
>            Summary: tun device's speed is set to ony 10mbps
>            Product: Drivers
>            Version: 2.5
>      KernelVersion: 2.6.24-19-generic

2.6.24-19-generic fails

>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: Network
>         AssignedTo: jgarzik@pobox.com
>         ReportedBy: dayasankar@movik.net
> 
> 
> Latest working kernel version:2.6.24-19-generic

2.6.24-19-generic does not fail.

Please clarify: which kernel version failed and whcih version did not?

Thanks.

> Earliest failing kernel version:
> Distribution:
> Hardware Environment:
> Software Environment:linux- ubuntu
> Problem Description: When I open tun device, speed is set to 10mbps and I am
> not able to change it to 100 Mbps
> 
> Steps to reproduce:
> 
> 1) here is ioctl stuff my tun device
> 
>         if (device) strncpy(tun->ifr.ifr_name, device, IFNAMSIZ);
>         tun->ifr.ifr_flags=(flags)?flags:IFF_TUN|IFF_NO_PI;
>         tun->fd=open("/dev/net/tun", O_RDWR);
>         //#ioctl(tun->fd, TUNSETIFF, (void *) &(tun->ifr));
>         ioctl(tun->fd, TUNSETIFF, (void *) &(tun->ifr));
>         ioctl(tun->fd,TUNSETPERSIST,1);
>         ioctl(tun->fd,TUNSETOWNER,500);
>         return (PyObject *)tun;
> 
> 2) Once I create tun device, here are properties of my tun device
> 
> root@daya-desktop:/home/daya/tuntap-0.1# ethtool tun0
> Settings for tun0:
>         Supported ports: [ ]
>         Supported link modes:   
>         Supports auto-negotiation: No
>         Advertised link modes:  Not reported
>         Advertised auto-negotiation: No
>         Speed: 10Mb/s
>         Duplex: Full
>         Port: Twisted Pair
>         PHYAD: 0
>         Transceiver: internal
>         Auto-negotiation: off
>         Current message level: 0xffffffa1 (-95)
>         Link detected: no
> 
> 3) When I tried to change the speed, it is throwing the following error
> 
> root@daya-desktop:/home/daya/tuntap-0.1# ethtool -s tun0 speed 100
> Cannot set new settings: Operation not supported
>   not setting speed
> 
> root@daya-desktop:/home/daya/tuntap-0.1# ifconfig tun0 media 100
> port: SIOCSIFMAP: Operation not supported

Re: [Bugme-new] [Bug 11620] New: tun device's speed is set to ony 10mbps

[David Miller]

TUN is a virtual device, not a physical one, it is just reporting
arbitrary values for things like link speed so that other aspects can
be discovered by standard tools (such as link state and offloading
features).

Please close this bug.