The combination of two commits:
commit 8e4e1713
("openvswitch: Simplify datapath locking.")
commit 2537b4dd
("openvswitch:: link upper device for port devices")

introduced a bug where upper_dev wasn't unlinked upon
netdev_unregister notification

The following steps:

  modprobe openvswitch
  ovs-dpctl add-dp test
  ip tuntap add dev tap1 mode tap
  ovs-dpctl add-if test tap1
  ip tuntap del dev tap1 mode tap

are causing multiple warnings:

[   62.747557] gre: GRE over IPv4 demultiplexor driver
[   62.749579] openvswitch: Open vSwitch switching datapath
[   62.755087] device test entered promiscuous mode
[   62.765911] device tap1 entered promiscuous mode
[   62.766033] IPv6: ADDRCONF(NETDEV_UP): tap1: link is not ready
[   62.769017] ------------[ cut here ]------------
[   62.769022] WARNING: CPU: 1 PID: 3267 at net/core/dev.c:5501 rollback_registered_many+0x20f/0x240()
[   62.769023] Modules linked in: openvswitch gre vxlan ip_tunnel libcrc32c ip6table_filter ip6_tables ebtable_nat ebtables nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack xt_CHECKSUM iptable_mangle ipt_REJECT xt_tcpudp iptable_filter ip_tables x_tables bridge stp llc vhost_net macvtap macvlan vhost kvm_intel kvm dm_crypt iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi hid_generic mxm_wmi eeepc_wmi asus_wmi sparse_keymap dm_multipath psmouse serio_raw usbhid hid parport_pc ppdev firewire_ohci lpc_ich firewire_core e1000e crc_itu_t binfmt_misc igb dca ptp pps_core mac_hid wmi lp parport i2o_config i2o_block video
[   62.769051] CPU: 1 PID: 3267 Comm: ip Not tainted 3.12.0-rc3+ #60
[   62.769052] Hardware name: System manufacturer System Product Name/P8Z77 WS, BIOS 3007 07/26/2012
[   62.769053]  0000000000000009 ffff8807f25cbd28 ffffffff8175e575 0000000000000006
[   62.769055]  0000000000000000 ffff8807f25cbd68 ffffffff8105314c ffff8807f25cbd58
[   62.769057]  ffff8807f2634000 ffff8807f25cbdc8 ffff8807f25cbd88 ffff8807f25cbdc8
[   62.769059] Call Trace:
[   62.769062]  [<ffffffff8175e575>] dump_stack+0x55/0x76
[   62.769065]  [<ffffffff8105314c>] warn_slowpath_common+0x8c/0xc0
[   62.769067]  [<ffffffff8105319a>] warn_slowpath_null+0x1a/0x20
[   62.769069]  [<ffffffff8162a04f>] rollback_registered_many+0x20f/0x240
[   62.769071]  [<ffffffff8162a101>] rollback_registered+0x31/0x40
[   62.769073]  [<ffffffff8162a488>] unregister_netdevice_queue+0x58/0x90
[   62.769075]  [<ffffffff8154f900>] __tun_detach+0x140/0x340
[   62.769077]  [<ffffffff8154fb36>] tun_chr_close+0x36/0x60
[   62.769080]  [<ffffffff811bddaf>] __fput+0xff/0x260
[   62.769082]  [<ffffffff811bdf5e>] ____fput+0xe/0x10
[   62.769084]  [<ffffffff8107b515>] task_work_run+0xb5/0xe0
[   62.769087]  [<ffffffff810029b9>] do_notify_resume+0x59/0x80
[   62.769089]  [<ffffffff813a41fe>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[   62.769091]  [<ffffffff81770f5a>] int_signal+0x12/0x17
[   62.769093] ---[ end trace 838756c62e156ffb ]---
[   62.769481] ------------[ cut here ]------------
[   62.769485] WARNING: CPU: 1 PID: 92 at fs/sysfs/inode.c:325 sysfs_hash_and_remove+0xa9/0xb0()
[   62.769486] sysfs: can not remove 'master', no directory
[   62.769486] Modules linked in: openvswitch gre vxlan ip_tunnel libcrc32c ip6table_filter ip6_tables ebtable_nat ebtables nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack xt_CHECKSUM iptable_mangle ipt_REJECT xt_tcpudp iptable_filter ip_tables x_tables bridge stp llc vhost_net macvtap macvlan vhost kvm_intel kvm dm_crypt iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi hid_generic mxm_wmi eeepc_wmi asus_wmi sparse_keymap dm_multipath psmouse serio_raw usbhid hid parport_pc ppdev firewire_ohci lpc_ich firewire_core e1000e crc_itu_t binfmt_misc igb dca ptp pps_core mac_hid wmi lp parport i2o_config i2o_block video
[   62.769514] CPU: 1 PID: 92 Comm: kworker/1:2 Tainted: G        W    3.12.0-rc3+ #60
[   62.769515] Hardware name: System manufacturer System Product Name/P8Z77 WS, BIOS 3007 07/26/2012
[   62.769518] Workqueue: events ovs_dp_notify_wq [openvswitch]
[   62.769519]  0000000000000009 ffff880807ad3ac8 ffffffff8175e575 0000000000000006
[   62.769521]  ffff880807ad3b18 ffff880807ad3b08 ffffffff8105314c ffff880807ad3b28
[   62.769523]  0000000000000000 ffffffff81a87a1f ffff8807f2634000 ffff880037038500
[   62.769525] Call Trace:
[   62.769528]  [<ffffffff8175e575>] dump_stack+0x55/0x76
[   62.769529]  [<ffffffff8105314c>] warn_slowpath_common+0x8c/0xc0
[   62.769531]  [<ffffffff81053236>] warn_slowpath_fmt+0x46/0x50
[   62.769533]  [<ffffffff8123e7e9>] sysfs_hash_and_remove+0xa9/0xb0
[   62.769535]  [<ffffffff81240e96>] sysfs_remove_link+0x26/0x30
[   62.769538]  [<ffffffff81631ef7>] __netdev_adjacent_dev_remove+0xf7/0x150
[   62.769540]  [<ffffffff81632037>] __netdev_adjacent_dev_unlink_lists+0x27/0x50
[   62.769542]  [<ffffffff8163213a>] __netdev_adjacent_dev_unlink_neighbour+0x3a/0x50
[   62.769544]  [<ffffffff8163218d>] netdev_upper_dev_unlink+0x3d/0x140
[   62.769548]  [<ffffffffa033c2db>] netdev_destroy+0x4b/0x80 [openvswitch]
[   62.769550]  [<ffffffffa033b696>] ovs_vport_del+0x46/0x60 [openvswitch]
[   62.769552]  [<ffffffffa0335314>] ovs_dp_detach_port+0x44/0x60 [openvswitch]
[   62.769555]  [<ffffffffa0336574>] ovs_dp_notify_wq+0xb4/0x150 [openvswitch]
[   62.769557]  [<ffffffff81075c28>] process_one_work+0x1d8/0x6a0
[   62.769559]  [<ffffffff81075bc8>] ? process_one_work+0x178/0x6a0
[   62.769562]  [<ffffffff8107659b>] worker_thread+0x11b/0x370
[   62.769564]  [<ffffffff81076480>] ? rescuer_thread+0x350/0x350
[   62.769566]  [<ffffffff8107f44a>] kthread+0xea/0xf0
[   62.769568]  [<ffffffff8107f360>] ? flush_kthread_worker+0x150/0x150
[   62.769570]  [<ffffffff81770bac>] ret_from_fork+0x7c/0xb0
[   62.769572]  [<ffffffff8107f360>] ? flush_kthread_worker+0x150/0x150
[   62.769573] ---[ end trace 838756c62e156ffc ]---
[   62.769574] ------------[ cut here ]------------
[   62.769576] WARNING: CPU: 1 PID: 92 at fs/sysfs/inode.c:325 sysfs_hash_and_remove+0xa9/0xb0()
[   62.769577] sysfs: can not remove 'upper_test', no directory
[   62.769577] Modules linked in: openvswitch gre vxlan ip_tunnel libcrc32c ip6table_filter ip6_tables ebtable_nat ebtables nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack xt_CHECKSUM iptable_mangle ipt_REJECT xt_tcpudp iptable_filter ip_tables x_tables bridge stp llc vhost_net macvtap macvlan vhost kvm_intel kvm dm_crypt iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi hid_generic mxm_wmi eeepc_wmi asus_wmi sparse_keymap dm_multipath psmouse serio_raw usbhid hid parport_pc ppdev firewire_ohci lpc_ich firewire_core e1000e crc_itu_t binfmt_misc igb dca ptp pps_core mac_hid wmi lp parport i2o_config i2o_block video
[   62.769603] CPU: 1 PID: 92 Comm: kworker/1:2 Tainted: G        W    3.12.0-rc3+ #60
[   62.769604] Hardware name: System manufacturer System Product Name/P8Z77 WS, BIOS 3007 07/26/2012
[   62.769606] Workqueue: events ovs_dp_notify_wq [openvswitch]
[   62.769607]  0000000000000009 ffff880807ad3ac8 ffffffff8175e575 0000000000000006
[   62.769609]  ffff880807ad3b18 ffff880807ad3b08 ffffffff8105314c ffff880807ad3b58
[   62.769611]  0000000000000000 ffff880807ad3bd9 ffff8807f2634000 ffff880037038500
[   62.769613] Call Trace:
[   62.769615]  [<ffffffff8175e575>] dump_stack+0x55/0x76
[   62.769617]  [<ffffffff8105314c>] warn_slowpath_common+0x8c/0xc0
[   62.769619]  [<ffffffff81053236>] warn_slowpath_fmt+0x46/0x50
[   62.769621]  [<ffffffff8123e7e9>] sysfs_hash_and_remove+0xa9/0xb0
[   62.769622]  [<ffffffff81240e96>] sysfs_remove_link+0x26/0x30
[   62.769624]  [<ffffffff81631f22>] __netdev_adjacent_dev_remove+0x122/0x150
[   62.769627]  [<ffffffff81632037>] __netdev_adjacent_dev_unlink_lists+0x27/0x50
[   62.769629]  [<ffffffff8163213a>] __netdev_adjacent_dev_unlink_neighbour+0x3a/0x50
[   62.769631]  [<ffffffff8163218d>] netdev_upper_dev_unlink+0x3d/0x140
[   62.769633]  [<ffffffffa033c2db>] netdev_destroy+0x4b/0x80 [openvswitch]
[   62.769636]  [<ffffffffa033b696>] ovs_vport_del+0x46/0x60 [openvswitch]
[   62.769638]  [<ffffffffa0335314>] ovs_dp_detach_port+0x44/0x60 [openvswitch]
[   62.769640]  [<ffffffffa0336574>] ovs_dp_notify_wq+0xb4/0x150 [openvswitch]
[   62.769642]  [<ffffffff81075c28>] process_one_work+0x1d8/0x6a0
[   62.769644]  [<ffffffff81075bc8>] ? process_one_work+0x178/0x6a0
[   62.769646]  [<ffffffff8107659b>] worker_thread+0x11b/0x370
[   62.769648]  [<ffffffff81076480>] ? rescuer_thread+0x350/0x350
[   62.769650]  [<ffffffff8107f44a>] kthread+0xea/0xf0
[   62.769652]  [<ffffffff8107f360>] ? flush_kthread_worker+0x150/0x150
[   62.769654]  [<ffffffff81770bac>] ret_from_fork+0x7c/0xb0
[   62.769656]  [<ffffffff8107f360>] ? flush_kthread_worker+0x150/0x150
[   62.769657] ---[ end trace 838756c62e156ffd ]---
[   62.769724] device tap1 left promiscuous mode

This patch also affects moving devices between net namespaces.

OVS used to ignore netns move notifications which caused problems.
Like:
  ovs-dpctl add-if test tap1
  ip link set tap1 netns 3512
and then removing tap1 inside the namespace will cause hang on missing dev_put.

With this patch OVS will detach dev upon receiving netns move event.
Signed-off-by: NAlexei Starovoitov <ast@plumgrid.com>
Signed-off-by: NJesse Gross <jesse@nicira.com>

So far, only net_device * could be passed along with netdevice notifier
event. This patch provides a possibility to pass custom structure
able to provide info that event listener needs to know.
Signed-off-by: NJiri Pirko <jiri@resnulli.us>

v2->v3: fix typo on simeth
	shortened dev_getter
	shortened notifier_info struct name
v1->v2: fix notifier_call parameter in call_netdevice_notifier()
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Currently OVS uses combination of genl and rtnl lock to protect
datapath state.  This was done due to networking stack locking.
But this has complicated locking and there are few lock ordering
issues with new tunneling protocols.
Following patch simplifies locking by introducing new ovs mutex
and now this lock is used to protect entire ovs state.
Signed-off-by: NPravin B Shelar <pshelar@nicira.com>
Signed-off-by: NJesse Gross <jesse@nicira.com>

Following patch adds support for network namespace to openvswitch.
Since it must release devices when namespaces are destroyed, a
side effect of this patch is that the module no longer keeps a
refcount but instead cleans up any state when it is unloaded.
Signed-off-by: NPravin B Shelar <pshelar@nicira.com>
Signed-off-by: NJesse Gross <jesse@nicira.com>

Replaced all instances of Nicira Networks(, Inc) to Nicira, Inc.
Signed-off-by: NRaju Subramanian <rsubramanian@nicira.com>
Signed-off-by: NBen Pfaff <blp@nicira.com>
Signed-off-by: NJesse Gross <jesse@nicira.com>

Open vSwitch is a multilayer Ethernet switch targeted at virtualized
environments.  In addition to supporting a variety of features
expected in a traditional hardware switch, it enables fine-grained
programmatic extension and flow-based control of the network.
This control is useful in a wide variety of applications but is
particularly important in multi-server virtualization deployments,
which are often characterized by highly dynamic endpoints and the need
to maintain logical abstractions for multiple tenants.

The Open vSwitch datapath provides an in-kernel fast path for packet
forwarding.  It is complemented by a userspace daemon, ovs-vswitchd,
which is able to accept configuration from a variety of sources and
translate it into packet processing rules.

See http://openvswitch.org for more information and userspace
utilities.
Signed-off-by: NJesse Gross <jesse@nicira.com>