Stephen Hemminger <stephen@xxxxxxxxxxxxxxxxxx> writes: > On Tue, 08 Aug 2017 16:03:56 +0200 > Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> wrote: > >> Stephen Hemminger <stephen@xxxxxxxxxxxxxxxxxx> writes: >> >> > Previous fix was incomplete. >> > >> >> Not really related to this patch series (which btw fixes my issue, >> thanks!), but I found one addition issue. Systemd fails to rename VF >> interface: >> >> kernel: mlx4_core 0002:00:02.0 eth2: joined to eth1 >> kernel: hv_netvsc 33b7a6f9-6736-451f-8fce-b382eaa50bee eth1: VF registering: eth2 >> kernel: hv_netvsc 33b7a6f9-6736-451f-8fce-b382eaa50bee eth1: Data path switched to VF: eth2 >> kernel: mlx4_en: eth2: Link Up >> NetworkManager[750]: <info> [1502200557.0821] device (eth2): link connected >> NetworkManager[750]: <info> [1502200557.1004] manager: (eth2): new Ethernet device (/org/freedesktop/NetworkManager/Devices/6) >> systemd-udevd[6942]: Error changing net interface name 'eth2' to 'enP2p0s2': Device or resource busy >> systemd-udevd[6942]: could not rename interface '6' from 'eth2' to 'enP2p0s2': Device or resource busy >> >> With some debug added I figured out what's wrong: __netvsc_vf_setup() >> does dev_open() which sets IFF_UP flag on the interface. When systemd >> tries to rename the interface we get into dev_change_name() and this >> fails with -EBUSY when (dev->flags & IFF_UP). >> >> The issue is of less importance as we're not supposed to configure VF >> interface now. However, we may still want to get a stable name for it. >> >> Any idea how this can be fixed? > > The problem is Network Manager should ignore the VF device. I don't run NM on these > interfaces because it causes more issues than it helps (dueling userspace). > > The driver needs to have slave track the master interface. Relying on userspace > to bring interface up leads to all the issues the bonding script had. > > One option would be to delay the work of bringing up the slave device to allow > small window for renaming to run. Actually, I tried removing 'if (dev->flags & IFF_UP)' check from dev_change_name() and everything seems to work fine. The history of this code predates git so I have no idea why it's forbiden to change names of IFF_UP interfaces... I can send an RFC removing the check to figure out the truth :-) -- Vitaly _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
