From: Siwei Liu <loseweigh@gmail.com>
To: Jiri Pirko <jiri@resnulli.us>
Cc: Stephen Hemminger <stephen@networkplumber.org>,
Sridhar Samudrala <sridhar.samudrala@intel.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
David Miller <davem@davemloft.net>,
Netdev <netdev@vger.kernel.org>,
virtualization@lists.linux-foundation.org,
virtio-dev <virtio-dev@lists.oasis-open.org>,
"Brandeburg, Jesse" <jesse.brandeburg@intel.com>,
Alexander Duyck <alexander.h.duyck@intel.com>,
Jakub Kicinski <kubakici@wp.pl>, Jason Wang <jasowang@redhat.com>,
liran.alon@oracle.com, si-wei liu <si-wei.liu@oracle.com>
Subject: net_failover slave udev renaming (was Re: [RFC PATCH net-next v6 4/4] netvsc: refactor notifier/event handling code to use the bypass framework)
Date: Thu, 21 Feb 2019 17:14:44 -0800 [thread overview]
Message-ID: <CADGSJ214RJV_zWVBGv0Ydo=CJj6WESTYAH=PpaYLFHdtWVrm3g@mail.gmail.com> (raw)
In-Reply-To: <20180411075334.GK2028@nanopsycho>
Sorry for replying to this ancient thread. There was some remaining
issue that I don't think the initial net_failover patch got addressed
cleanly, see:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1815268
The renaming of 'eth0' to 'ens4' fails because the udev userspace was
not specifically writtten for such kernel automatic enslavement.
Specifically, if it is a bond or team, the slave would typically get
renamed *before* virtual device gets created, that's what udev can
control (without getting netdev opened early by the other part of
kernel) and other userspace components for e.g. initramfs,
init-scripts can coordinate well in between. The in-kernel
auto-enslavement of net_failover breaks this userspace convention,
which don't provides a solution if user care about consistent naming
on the slave netdevs specifically.
Previously this issue had been specifically called out when IFF_HIDDEN
and the 1-netdev was proposed, but no one gives out a solution to this
problem ever since. Please share your mind how to proceed and solve
this userspace issue if netdev does not welcome a 1-netdev model.
On Wed, Apr 11, 2018 at 12:53 AM Jiri Pirko <jiri@resnulli.us> wrote:
>
> Tue, Apr 10, 2018 at 11:26:08PM CEST, stephen@networkplumber.org wrote:
> >On Tue, 10 Apr 2018 11:59:50 -0700
> >Sridhar Samudrala <sridhar.samudrala@intel.com> wrote:
> >
> >> Use the registration/notification framework supported by the generic
> >> bypass infrastructure.
> >>
> >> Signed-off-by: Sridhar Samudrala <sridhar.samudrala@intel.com>
> >> ---
> >
> >Thanks for doing this. Your current version has couple show stopper
> >issues.
> >
> >First, the slave device is instantly taking over the slave.
> >This doesn't allow udev/systemd to do its device rename of the slave
> >device. Netvsc uses a delayed work to workaround this.
>
> Wait. Why the fact a device is enslaved has to affect the udev in any
> way? If it does, smells like a bug in udev.
See above for clarifications.
Thanks,
>
>
> >
> >Secondly, the select queue needs to call queue selection in VF.
> >The bonding/teaming logic doesn't work well for UDP flows.
> >Commit b3bf5666a510 ("hv_netvsc: defer queue selection to VF")
> >fixed this performance problem.
> >
> >Lastly, more indirection is bad in current climate.
> >
> >I am not completely adverse to this but it needs to be fast, simple
> >and completely transparent.
next prev parent reply other threads:[~2019-02-22 1:14 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-10 18:59 [RFC PATCH net-next v6 0/4] Enable virtio_net to act as a backup for a passthru device Sridhar Samudrala
2018-04-10 18:59 ` [RFC PATCH net-next v6 1/4] virtio_net: Introduce VIRTIO_NET_F_BACKUP feature bit Sridhar Samudrala
2018-04-10 18:59 ` [RFC PATCH net-next v6 2/4] net: Introduce generic bypass module Sridhar Samudrala
2018-04-11 15:51 ` Jiri Pirko
2018-04-11 19:13 ` Samudrala, Sridhar
2018-04-18 9:25 ` Jiri Pirko
2018-04-18 18:43 ` Samudrala, Sridhar
2018-04-18 19:13 ` Jiri Pirko
2018-04-18 19:46 ` Michael S. Tsirkin
2018-04-18 20:32 ` Jiri Pirko
2018-04-18 22:46 ` Samudrala, Sridhar
2018-04-19 6:35 ` Jiri Pirko
2018-04-19 4:08 ` Michael S. Tsirkin
2018-04-19 7:22 ` Jiri Pirko
2018-04-10 18:59 ` [RFC PATCH net-next v6 3/4] virtio_net: Extend virtio to use VF datapath when available Sridhar Samudrala
2018-04-10 18:59 ` [RFC PATCH net-next v6 4/4] netvsc: refactor notifier/event handling code to use the bypass framework Sridhar Samudrala
2018-04-10 21:26 ` Stephen Hemminger
2018-04-10 22:56 ` Samudrala, Sridhar
2018-04-10 23:28 ` Michael S. Tsirkin
2018-04-10 23:44 ` Siwei Liu
2018-04-10 23:59 ` Stephen Hemminger
2018-04-11 7:50 ` Jiri Pirko
2018-04-11 1:21 ` Michael S. Tsirkin
2018-04-11 7:53 ` Jiri Pirko
2019-02-22 1:14 ` Siwei Liu [this message]
2019-02-22 1:39 ` net_failover slave udev renaming (was Re: [RFC PATCH net-next v6 4/4] netvsc: refactor notifier/event handling code to use the bypass framework) Michael S. Tsirkin
2019-02-22 3:33 ` [virtio-dev] " si-wei liu
[not found] ` <91d4cbb1-be7a-b53c-6b2a-99bef07e7c53@intel.com>
2019-02-22 7:55 ` si-wei liu
2019-02-22 12:58 ` Rob Miller
2019-02-22 15:14 ` Michael S. Tsirkin
2019-02-26 0:58 ` si-wei liu
2019-02-26 1:39 ` Stephen Hemminger
2019-02-26 2:05 ` Michael S. Tsirkin
2019-02-27 0:49 ` si-wei liu
2019-02-26 2:08 ` Michael S. Tsirkin
2019-02-27 0:17 ` si-wei liu
2019-02-27 21:57 ` Stephen Hemminger
2019-02-27 22:30 ` si-wei liu
2019-02-27 22:38 ` Michael S. Tsirkin
2019-02-27 23:34 ` si-wei liu
2019-02-27 23:50 ` Michael S. Tsirkin
2019-02-28 0:00 ` Liran Alon
2019-02-28 0:03 ` Stephen Hemminger
2019-02-28 0:38 ` Michael S. Tsirkin
2019-02-28 0:38 ` si-wei liu
2019-02-28 0:41 ` Michael S. Tsirkin
2019-02-28 0:52 ` Jakub Kicinski
2019-02-28 1:26 ` Michael S. Tsirkin
2019-02-28 1:52 ` Jakub Kicinski
2019-02-28 4:47 ` Michael S. Tsirkin
2019-02-28 18:13 ` Jakub Kicinski
2019-02-28 19:36 ` Michael S. Tsirkin
2019-02-28 19:56 ` Jakub Kicinski
2019-02-28 20:14 ` Michael S. Tsirkin
2019-02-28 23:31 ` Jakub Kicinski
2019-03-01 0:20 ` Siwei Liu
2019-03-01 1:05 ` Jakub Kicinski
2019-03-02 0:30 ` Siwei Liu
2019-02-28 9:32 ` si-wei liu
2019-02-28 14:26 ` Michael S. Tsirkin
2019-03-01 1:30 ` si-wei liu
2019-03-01 13:27 ` Michael S. Tsirkin
2019-03-01 20:55 ` si-wei liu
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