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linux/net/core
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Kuniyuki Iwashima eef9bddc33 net: fib_rules: Only hold RTNL for the first IPv4 RTM_NEWRULE. 
Now, RTM_DELRULE no longer needs RTNL, and the only RTNL dependant
in RTM_NEWRULE is fib_unmerge(), which is called for the first
IPv4 rule.

Let's add fib_rules_ops.need_rtnl() and hold RTNL only for the
first IPv4 rule.

Tested:
The script below creates 1K rules in parallel in 4K netns, and
it got 20x/30x faster for IPv4/IPv6.

  #!/bin/bash
  N=4096
  F=rules.txt

  for i in $(seq $N); do ip netns add ns-$i; done
  printf 'rule add from all table %d\n' {1..1024} > $F

  for v in 4 6; do
  	echo "=== IPv${v} ==="
  	time { for i in $(seq $N); do nsenter \
  	--net=/var/run/netns/ns-$i ip -$v -batch $F & done; wait; }
  done

  for i in $(seq $N); do ip netns del ns-$i; done
  rm -f $F

Without this series:

  # ./test.sh
  === IPv4 ===

  real	0m22.752s
  user	0m7.834s
  sys	92m46.721s
  === IPv6 ===

  real	0m35.181s
  user	0m8.635s
  sys	142m30.479s

With this series:

  # ./test.sh
  === IPv4 ===

  real	0m0.918s
  user	0m5.675s
  sys	2m7.024s
  === IPv6 ===

  real	0m1.214s
  user	0m7.917s
  sys	4m19.489s

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260629181226.1929658-10-kuniyu@google.com
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
2026-07-01 18:42:34 +02:00
..
bpf_sk_storage.c bpf: Fix sk_local_storage diag dumping uninitialized special fields 2026-04-24 11:21:34 -07:00
datagram.c net: datagram: introduce datagram_poll_queue for custom receive queues 2025-10-23 15:46:04 +02:00
dev_addr_lists_test.c net: cache snapshot entries for ndo_set_rx_mode_async 2026-04-21 12:50:13 +02:00
dev_addr_lists.c net: turn the rx_mode work into a generic netdev_work facility 2026-06-25 10:18:40 -07:00
dev_api.c net: introduce ndo_set_rx_mode_async and netdev_rx_mode_work 2026-04-21 12:50:03 +02:00
dev_ioctl.c net: ethtool: make dev->hwprov ops-protected 2026-06-09 10:13:04 -07:00
dev.c vlan: defer real device state propagation to netdev_work 2026-06-25 10:18:40 -07:00
dev.h net: turn the rx_mode work into a generic netdev_work facility 2026-06-25 10:18:40 -07:00
devmem.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2026-05-21 15:09:02 -07:00
devmem.h net: devmem: support TX over NETMEM_TX_NO_DMA devices 2026-05-18 18:49:06 -07:00
drop_monitor.c net: constify sk_skb_reason_drop() sock parameter 2026-05-12 18:31:11 -07:00
dst_cache.c net: dst: annotate data-races around dst->obsolete 2025-07-02 14:32:29 -07:00
dst.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
failover.c net: net_failover: Fix the deadlock in slave register 2026-05-13 19:01:03 -07:00
fib_notifier.c net: Add SPDX ids to some source files 2026-03-09 18:32:45 -07:00
fib_rules.c net: fib_rules: Only hold RTNL for the first IPv4 RTM_NEWRULE. 2026-07-01 18:42:34 +02:00
filter.c Including fixes from netfilter and IPsec. 2026-06-25 12:25:36 -07:00
flow_dissector.c flow_dissector: check device type before reading ETH_ADDRS 2026-06-18 18:07:00 -07:00
flow_offload.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
gen_estimator.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
gen_stats.c net/sched: add const qualifiers to gnet_stats helpers 2026-05-11 18:28:08 -07:00
gro_cells.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
gro.c net: add pskb_may_pull() to skb_gro_receive_list() 2026-06-08 17:20:23 -07:00
gso.c
hotdata.c net: remove EXPORT_IPV6_MOD() and EXPORT_IPV6_MOD_GPL() macros 2026-03-29 11:21:22 -07:00
hwbm.c
ieee8021q_helpers.c net: ieee8021q: fix insufficient table-size assertion 2025-07-01 12:55:49 +02:00
link_watch.c net: rename netdev_ops_assert_locked() 2026-06-04 14:04:55 -07:00
lock_debug.c net: document NETDEV_CHANGENAME as ops locked 2026-06-04 14:04:55 -07:00
lwt_bpf.c bpf: Update transport_header when encapsulating UDP tunnel in lwt 2026-06-05 15:28:28 -07:00
lwtunnel.c net: lwtunnel: Drop skb metadata before LWT encapsulation 2026-06-23 19:07:23 -07:00
Makefile net: turn the rx_mode work into a generic netdev_work facility 2026-06-25 10:18:40 -07:00
mp_dmabuf_devmem.h
neighbour.c neighbour: remove obsolete EXPORT_SYMBOL() 2026-06-08 15:59:17 -07:00
net_namespace.c Networking changes for 7.1. 2026-04-14 18:36:10 -07:00
net_test.c
net-procfs.c net: add proper RCU protection to /proc/net/ptype 2026-02-03 19:20:30 -08:00
net-sysfs.c rtnetlink: use dev_isalive() in rtnl_getlink() 2026-06-04 18:16:14 -07:00
net-sysfs.h net: add skb_defer_disable_key static key 2026-03-12 19:25:33 -07:00
net-traces.c move asm/unaligned.h to linux/unaligned.h 2024-10-02 17:23:23 -04:00
netclassid_cgroup.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
netdev_config.c net: add queue config validation callback 2026-01-23 11:49:02 -08:00
netdev_queues.c net: rename netdev_ops_assert_locked() 2026-06-04 14:04:55 -07:00
netdev_rx_queue.c net: Stop leased rxq before uninstalling its memory provider 2026-06-11 15:57:39 -07:00
netdev_work.c net: add the driver-facing netdev_work scheduling API 2026-06-25 10:18:40 -07:00
netdev-genl-gen.c net: devmem: allow bind-rx from non-init user namespaces 2026-06-05 18:10:31 -07:00
netdev-genl-gen.h net: Add queue-create operation 2026-04-09 18:21:45 -07:00
netdev-genl.c netdev-genl: report NAPI thread PID in the caller's pid namespace 2026-06-17 16:09:32 -07:00
netevent.c
netmem_priv.h Revert "mm: introduce a new page type for page pool in page type" 2026-05-21 19:06:13 -07:00
netpoll.c netpoll: do not warn when the best-effort pool refill fails 2026-06-30 17:15:11 -07:00
netprio_cgroup.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
of_net.c
page_pool_priv.h net: page_pool: don't try to stash the napi id 2025-01-27 14:37:41 -08:00
page_pool_user.c net: make page_pool_get_stats() void 2026-05-28 18:10:03 -07:00
page_pool.c net: make page_pool_get_stats() void 2026-05-28 18:10:03 -07:00
pktgen.c kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
ptp_classifier.c
rtnetlink.c net: ip_gre: require CAP_NET_ADMIN in the device netns for changelink 2026-06-17 16:01:52 -07:00
scm.c net: use ktime_t in struct scm_timestamping_internal 2026-03-04 17:53:34 -08:00
secure_seq.c tcp: secure_seq: add back ports to TS offset 2026-03-04 17:44:35 -08:00
selftests.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
skb_fault_injection.c net: Implement fault injection forcing skb reallocation 2024-11-12 12:05:33 +01:00
skbuff.c Networking changes for 7.2. 2026-06-17 08:17:00 +01:00
skmsg.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2026-06-16 14:59:58 -07:00
sock_diag.c net: Add SPDX ids to some source files 2026-03-09 18:32:45 -07:00
sock_map.c sockmap: Fix sk_psock_drop() race vs sock_map_{unhash,close,destroy}(). 2026-04-23 18:24:02 -07:00
sock_reuseport.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
sock.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2026-06-11 14:33:35 -07:00
stream.c net: remove some unused EXPORT_SYMBOL()s 2026-06-12 16:43:11 -07:00
sysctl_net_core.c net: add skb_defer_disable_key static key 2026-03-12 19:25:33 -07:00
timestamping.c net: Add the possibility to support a selected hwtstamp in netdevice 2024-12-16 12:51:40 +00:00
tso.c net: tso: Introduce tso_dma_map and helpers 2026-04-12 10:54:31 -07:00
utils.c kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
xdp.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00