netdev - [PATCH v1 net-next 00/13] mpls: Remove RTNL dependency.

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Message-ID: <20251028033812.2043964-1-kuniyu@google.com>
Date: Tue, 28 Oct 2025 03:36:55 +0000
From: Kuniyuki Iwashima <kuniyu@...gle.com>
To: "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: Simon Horman <horms@...nel.org>, Kuniyuki Iwashima <kuniyu@...gle.com>, 
	Kuniyuki Iwashima <kuni1840@...il.com>, netdev@...r.kernel.org
Subject: [PATCH v1 net-next 00/13] mpls: Remove RTNL dependency.

MPLS uses RTNL

  1) to guarantee the lifetime of struct mpls_nh.nh_dev
  2) to protect net->mpls.platform_label

, but neither actually requires RTNL.

If struct mpls_nh holds a refcnt for nh_dev, we do not need RTNL,
and it can be replaced with a dedicated mutex.

The series removes RTNL from net/mpls/.

Overview:

  Patch 1 is misc cleanup.

  Patch 2 - 9 are prep to drop RTNL for RTM_{NEW,DEL,GET}ROUTE
  handlers.

  Patch 10 & 11 converts mpls_dump_routes() and RTM_GETNETCONF to RCU.

  Patch 12 replaces RTNL with a new per-netns mutex.

  Patch 13 drops RTNL from RTM_{NEW,DEL,GET}ROUTE.


Kuniyuki Iwashima (13):
  mpls: Return early in mpls_label_ok().
  mpls: Hold dev refcnt for mpls_nh.
  mpls: Unify return paths in mpls_dev_notify().
  ipv6: Add in6_dev_rcu().
  mpls: Use in6_dev_rcu() and dev_net_rcu() in mpls_forward() and
    mpls_xmit().
  mpls: Add mpls_dev_rcu().
  mpls: Pass net to mpls_dev_get().
  mpls: Add mpls_route_input().
  mpls: Use mpls_route_input() where appropriate.
  mpls: Convert mpls_dump_routes() to RCU.
  mpls: Convert RTM_GETNETCONF to RCU.
  mpls: Protect net->mpls.platform_label with a per-netns mutex.
  mpls: Drop RTNL for RTM_NEWROUTE, RTM_DELROUTE, and RTM_GETROUTE.

 include/net/addrconf.h   |   5 +
 include/net/netns/mpls.h |   1 +
 net/mpls/af_mpls.c       | 320 ++++++++++++++++++++++++---------------
 net/mpls/internal.h      |  19 ++-
 net/mpls/mpls_iptunnel.c |   6 +-
 5 files changed, 224 insertions(+), 127 deletions(-)

-- 
2.51.1.838.g19442a804e-goog