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From: Kuniyuki Iwashima To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: Simon Horman , Kuniyuki Iwashima , Kuniyuki Iwashima , netdev@vger.kernel.org Content-Type: text/plain; charset="UTF-8" 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. Changes: v2: * Patch 10 : Removed dup entry of RTM_GETROUTE in mpls_rtnl_msg_handlers[] (Guillaume Nault) v1: https://lore.kernel.org/netdev/20251028033812.2043964-1-kuniyu@google.com/ 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 | 321 ++++++++++++++++++++++++--------------- net/mpls/internal.h | 19 ++- net/mpls/mpls_iptunnel.c | 6 +- 5 files changed, 224 insertions(+), 128 deletions(-) -- 2.51.1.851.g4ebd6896fd-goog