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From: Kuniyuki Iwashima To: "David S . Miller" , David Ahern , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: Simon Horman , Kuniyuki Iwashima , Kuniyuki Iwashima , netdev@vger.kernel.org Content-Type: text/plain; charset="UTF-8" This series removes RTNL from ipmr rtnetlink handlers. After this series, there are a few RTNL left in net/ipv4/ipmr.c and such users will be converted to per-netns RTNL in another series. Patch 1 adds a selftest to exercise most? of the RTNL paths in net/ipv4/ipmr.c Patch 2 - 6 converts RTM_GETLINK / RTM_GETROUTE handlers to RCU. Patch 7 - 9 converts ->exit_batch() to ->exit_rtnl() to save one RTNL in cleanup_net(). Patch 10 - 11 removes unnecessary RTNL during setup_net() failure. Patch 12 is a random cleanup. Patch 13 - 15 drops RTNL for RTM_NEWROUTE and RTM_DELROUTE. Changes: v2: Patch 1: Add ipmr to .gitignore Patch 3: Add READ_ONCE() for mrt->maxvif in ipmr_rtm_dumplink(). Patch 10: Use a local list in ipmr_free_table() v1: https://lore.kernel.org/netdev/20260226023637.1335854-1-kuniyu@google.com/ Kuniyuki Iwashima (15): selftest: net: Add basic functionality tests for ipmr. ipmr: Annotate access to mrt->mroute_do_{pim,assert,wrvifwhole}. ipmr: Convert ipmr_rtm_dumplink() to RCU. ipmr: Use MAXVIFS in mroute_msgsize(). ipmr: Convert ipmr_rtm_getroute() to RCU. ipmr: Convert ipmr_rtm_dumproute() to RCU. ipmr: Move unregister_netdevice_many() out of mroute_clean_tables(). ipmr: Move unregister_netdevice_many() out of ipmr_free_table(). ipmr: Convert ipmr_net_exit_batch() to ->exit_rtnl(). ipmr: Remove RTNL in ipmr_rules_init() and ipmr_net_init(). ipmr: Call fib_rules_unregister() without RTNL. ipmr: Define net->ipv4.{ipmr_notifier_ops,ipmr_seq} under CONFIG_IP_MROUTE. ipmr/ip6mr: Convert net->ipv[46].ipmr_seq to atomic_t. ipmr: Add dedicated mutex for mrt->{mfc_hash,mfc_cache_list}. ipmr: Don't hold RTNL for ipmr_rtm_route(). include/linux/mroute_base.h | 9 +- include/net/netns/ipv4.h | 6 +- include/net/netns/ipv6.h | 2 +- net/ipv4/ipmr.c | 261 ++++++---- net/ipv4/ipmr_base.c | 4 +- net/ipv6/ip6mr.c | 4 +- .../selftests/net/forwarding/.gitignore | 1 + .../testing/selftests/net/forwarding/Makefile | 4 + tools/testing/selftests/net/forwarding/ipmr.c | 455 ++++++++++++++++++ 9 files changed, 634 insertions(+), 112 deletions(-) create mode 100644 tools/testing/selftests/net/forwarding/ipmr.c -- 2.53.0.473.g4a7958ca14-goog