Mellanox NIC names changed, each kldunload/kldload mlx4ib module

[Garrett Cooper]

On Jun 9, 2013, at 5:35 AM, Alex Liptsin wrote:

> Hi.
> 
> I work with FreeBSD9.1 and Mellanox devices.
> Every time I unload / load mlx4ib module, NIC names of mellanox devices (ibX) are renamed.
> Can I prevent it?
> 
> [root at h-qa-032 mlx4]# ifconfig
> ib8: flags=8002<BROADCAST,MULTICAST> metric 0 mtu 65520
>        options=80018<VLAN_MTU,VLAN_HWTAGGING,LINKSTATE>
>        lladdr 80.28.0.48.fe.80.0.0.0.0.0.0.0.2.c9.3.0.2e.48.31
>        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
> ib9: flags=8002<BROADCAST,MULTICAST> metric 0 mtu 65520
>        options=80018<VLAN_MTU,VLAN_HWTAGGING,LINKSTATE>
>        lladdr 80.28.0.49.fe.80.0.0.0.0.0.0.0.2.c9.3.0.2e.48.32
>        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
> 
> [root at h-qa-032 mlx4]# kldunload mlx4ib
> 
> [root at h-qa-032 mlx4]# kldload -v mlx4ib
> Loaded mlx4ib, id=9
> 
> [root at h-qa-032 mlx4]# ifconfig
> ib10: flags=8002<BROADCAST,MULTICAST> metric 0 mtu 65520
>        options=80018<VLAN_MTU,VLAN_HWTAGGING,LINKSTATE>
>        lladdr 80.30.0.48.fe.80.0.0.0.0.0.0.0.2.c9.3.0.2e.48.31
>        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
> ib11: flags=8002<BROADCAST,MULTICAST> metric 0 mtu 65520
>        options=80018<VLAN_MTU,VLAN_HWTAGGING,LINKSTATE>
>        lladdr 80.30.0.49.fe.80.0.0.0.0.0.0.0.2.c9.3.0.2e.48.32
>        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>


	You're probably running into a driver bug because OFED/ipoib was never meant to be unloaded (assuming you're using my sources). Check the detach/destroy routines to make sure that it's properly detaching everything and updating indexes in the network stack before it unloads the driver.
Cheers,
-Garrett