rtnetlink: Add per-netns rtnl_work.

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The biggest blocker to per-netns RTNL is netdev unregistration.

It starts within a single netns (e.g., during a device lookup or
netns dismantle), but it can eventually involve multiple namespaces,
such as when upper ipvlan devices reside in different netns.

This prevents us from acquiring multiple rtnl_net_lock()s beforehand.

When we encounter such a cross-netns device, we must delegate the
unregistration to the work of the netns where the device actually
resides.

Let's add per-netns rtnl_work to support the deferred netdev
unregistration.

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260703001009.1572444-4-kuniyu@google.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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Kuniyuki Iwashima 2026-07-03 00:09:14 +00:00 • committed by Paolo Abeni

parent 49c26d4bf1

commit c6cfaf9783

4 changed files with 36 additions and 0 deletions

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8

include/linux/rtnetlink.h

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1

include/net/net_namespace.h

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1

net/core/net_namespace.c

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26

net/core/rtnetlink.c

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