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00a40d8092
linux/drivers
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Kuniyuki Iwashima 00a40d8092 ipvlan: Support per-netns netdev unregistration. 
When a lower device is unregistered, its upper ipvlan devices
must also be unregistered.  However, these upper devices may
reside in different netns than the lower device.

Let's use unregister_netdevice_queue_net() to support per-netns
device unregistration for ipvlan.

The new dying flag in struct ipvl_dev is used to avoid a race
that ipvlan_link_delete() is called while its lower device is
being removed in ipvlan_device_event().

If dying is true in ipvlan_link_delete(), the ipvlan device is
already destructed but not yet unregistered.  In this case,
unregistration will be done in __rtnl_net_unlock() of the
->dellink() caller.

Tested:

1. Create veth in ns1 and two ipvlan devices in ns2 and ns3.

  # ip netns add ns1
  # ip netns add ns2
  # ip netns add ns3
  # ip -n ns1 link add veth0 type veth peer veth1
  # ip -n ns2 link add ipvl2 link veth0 link-netns ns1 type ipvlan mode l2
  # ip -n ns3 link add ipvl3 link veth0 link-netns ns1 type ipvlan mode l2

2. Run bpftrace to check that veth is unregistered first but
   wait ipvlan to be unregistered

  # bpftrace -e '#include <linux/netdevice.h>
  kprobe:ipvlan_uninit,
  kprobe:veth_dellink,
  kprobe:free_netdev {
      $dev = (struct net_device *)arg0;
      printf("PID: %d | DEV: %s%s\n", pid, $dev->name, kstack());
  }'

3. Remove the lower veth0 in ns1.

  # ip -n ns1 link del veth0

We can see that veth0 is freed after unregistering ipvl2 and ipvl3
in per-netns work because ipvl_port holds refcount of veth0.

  PID: 2010 | DEV: veth0
          veth_dellink+5
          rtnl_dellink+1213
          rtnetlink_rcv_msg+1791
  ...
  PID: 440 | DEV: ipvl2
          ipvlan_uninit+5
          unregister_netdevice_many_notify+7129
          unregister_netdevice_many_net+1050
          rtnl_net_work_func+136
          process_scheduled_works+2538
  ...
  PID: 440 | DEV: ipvl2
          free_netdev+5
          netdev_run_todo+4798
          process_scheduled_works+2538
  ...
  PID: 440 | DEV: ipvl3
          ipvlan_uninit+5
          unregister_netdevice_many_notify+7129
          unregister_netdevice_many_net+1050
          rtnl_net_work_func+136
          process_scheduled_works+2538
  ...
  PID: 2010 | DEV: veth0
          free_netdev+5
          netdev_run_todo+4798
          rtnl_dellink+1507
          rtnetlink_rcv_msg+1791
  ...
  PID: 440 | DEV: ipvl3
          free_netdev+5
          netdev_run_todo+4798
          process_scheduled_works+2538
  ...

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260703001009.1572444-15-kuniyu@google.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2026-07-11 12:57:50 +02:00
..
accel drm fixes for 7.2-rc2 2026-07-03 15:42:20 -10:00
accessibility
acpi ACPI support fixes for 7.2-rc2 2026-07-03 15:13:50 -10:00
amba
android
ata Split <linux/mod_devicetable.h> in per subsystem headers 2026-07-02 20:54:26 -10:00
atm atm: remove unused ATM PHY operations 2026-06-16 08:53:53 -07:00
auxdisplay Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
base regmap: Fix for v7.2 2026-06-26 10:47:26 -07:00
bcma
block Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
bluetooth Including fixes from netfilter, Bluetooth and batman-adv. 2026-07-09 08:26:51 -07:00
bus Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
cache Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
cdrom
cdx Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
char Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
clk Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
clocksource A series of updates for the VDSO: 2026-06-15 13:57:13 +05:30
comedi
connector
counter Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
cpufreq Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
cpuidle cpuidle: Allow exit latency to exceed target residency 2026-06-23 14:00:29 +02:00
crypto Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
cxl cxl: Support dpa without a mailbox 2026-06-29 10:55:47 -07:00
dax mm.git review status for mm-hotfixes-stable..mm-stable 2026-06-19 10:14:34 -07:00
dca
devfreq Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
dibs dibs: loopback: validate offset and size in move_data() 2026-07-09 12:44:00 +02:00
dio
dma Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
dma-buf Merge drm/drm-fixes into drm-misc-fixes 2026-06-29 17:58:00 +02:00
dpll Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2026-07-10 10:20:05 +02:00
edac Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
eisa
extcon Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
firewire Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
firmware Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
fpga Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
fsi Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
fwctl
gnss
gpib Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
gpio gpio fixes for v7.2-rc2 2026-07-03 05:38:12 -10:00
gpu drm fixes for 7.2-rc2 2026-07-03 15:42:20 -10:00
greybus
hid hid-for-linus-2026070801 2026-07-08 08:43:44 -07:00
hsi Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
hte Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
hv hyperv-next for v7.2-rc1 2026-06-22 08:06:13 -07:00
hwmon Split <linux/mod_devicetable.h> in per subsystem headers 2026-07-02 20:54:26 -10:00
hwspinlock
hwtracing Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
i2c Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
i3c i3c: mipi-i3c-hci: Use named initializers for platform_device_id's .driver_data 2026-06-16 23:19:45 +02:00
idle x86/msr updates for v7.2: 2026-06-15 15:08:14 +05:30
iio Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
infiniband RDMA v7.2 merge window 2026-06-18 08:16:21 -07:00
input Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
interconnect Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
iommu Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
ipack
irqchip Misc irqchip driver fixes: 2026-07-05 05:29:41 -10:00
leds Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
macintosh
mailbox Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
mcb
md block-7.2-20260625 2026-06-25 09:56:47 -07:00
media Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
memory Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
memstick
message
mfd Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
misc Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
mmc Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
most
mtd Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
mux Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
net ipvlan: Support per-netns netdev unregistration. 2026-07-11 12:57:50 +02:00
nfc Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
ntb NTB updates include an EPF bug fix to prevent an invalid unmap during 2026-06-28 07:46:12 -07:00
nubus
nvdimm Updates for the 7.2 release 2026-06-18 16:27:58 -07:00
nvme block-7.2-20260625 2026-06-25 09:56:47 -07:00
nvmem Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
of Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
opp
parisc
parport
pci Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
pcmcia
peci
perf Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
phy Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
pinctrl gpio fixes for v7.2-rc2 2026-07-03 05:38:12 -10:00
platform Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
pmdomain Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
pnp Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
power Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
powercap
pps Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
ps3
ptp Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
pwm Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
rapidio mm.git review status for mm-hotfixes-stable..mm-nonmm-stable 2026-06-21 13:20:19 -07:00
ras - Fix a malformed Kconfig default for the AMD Address Translation Library 2026-06-16 05:31:01 +05:30
regulator Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
remoteproc
resctrl arm64 updates for 7.2 2026-06-16 05:18:04 +05:30
reset Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
rpmsg rpmsg update for v7.2 2026-06-20 23:31:15 -07:00
rtc Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
s390 s390 updates for 7.2-rc2 2026-07-04 06:28:45 -10:00
sbus
scsi mm.git review status for mm-hotfixes-stable..mm-nonmm-stable 2026-06-21 13:20:19 -07:00
sh
siox Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
slimbus
soc Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
soundwire Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
spi spi: Fixes for v7.2 2026-07-05 05:24:06 -10:00
spmi Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
ssb
staging Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
target Merge branch 7.1/scsi-fixes into 7.2/scsi-staging 2026-06-15 21:01:30 -04:00
tc
tee soc: drivers for 7.2 2026-06-17 11:21:40 -07:00
thermal Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
thunderbolt USB/Thunderbolt driver changes for 7.2-rc1 2026-06-22 12:09:47 -07:00
tty Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
ufs SCSI misc on 20260621 2026-06-21 10:29:45 -07:00
uio Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
usb Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
vdpa Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
vfio vfio/pci: Expose latched module parameter policy in debugfs 2026-06-29 14:26:31 -06:00
vhost mm.git review status for mm-hotfixes-stable..mm-nonmm-stable 2026-06-21 13:20:19 -07:00
video Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
virt Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
virtio virtio,vhost,vdpa: features, fixes 2026-06-17 11:49:00 -07:00
w1 Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
watchdog Replace <linux/mod_devicetable.h> by more specific <linux/device-id/*.h> (c files) 2026-07-03 07:38:17 +02:00
xen xenbus: reject unterminated directory replies 2026-07-01 10:01:14 +02:00
zorro
Kconfig
Makefile