Eric Dumazet 7075faa754 net: give more chances to rcu in netdev_wait_allrefs_any() ... [ Upstream commit cd42ba1c8ac9deb9032add6adf491110e7442040 ] This came while reviewing commit c4e86b4363ac ("net: add two more call_rcu_hurry()"). Paolo asked if adding one synchronize_rcu() would help. While synchronize_rcu() does not help, making sure to call rcu_barrier() before msleep(wait) is definitely helping to make sure lazy call_rcu() are completed. Instead of waiting ~100 seconds in my tests, the ref_tracker splats occurs one time only, and netdev_wait_allrefs_any() latency is reduced to the strict minimum. Ideally we should audit our call_rcu() users to make sure no refcount (or cascading call_rcu()) is held too long, because rcu_barrier() is quite expensive. Fixes: 0e4be9e57e ("net: use exponential backoff in netdev_wait_allrefs") Signed-off-by: Eric Dumazet <edumazet@google.com> Link: https://lore.kernel.org/all/28bbf698-befb-42f6-b561-851c67f464aa@kernel.org/T/#m76d73ed6b03cd930778ac4d20a777f22a08d6824 Reviewed-by: Jiri Pirko <jiri@nvidia.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-06-16 13:39:23 +02:00
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Makefile	of: net: move of_net under net/	2022-03-08 19:12:41 +01:00
bpf_sk_storage.c	bpf: Add length check for SK_DIAG_BPF_STORAGE_REQ_MAP_FD parsing	2023-08-11 15:13:50 +02:00
datagram.c	net: datagram: fix data-races in datagram_poll()	2023-05-24 17:36:42 +01:00
datagram.h	…
dev.c	net: give more chances to rcu in netdev_wait_allrefs_any()	2024-06-16 13:39:23 +02:00
dev_addr_lists.c	net: dev_addr_list: handle first address in __hw_addr_add_ex	2021-09-30 13:29:09 +01:00
dev_ioctl.c	net: dev: Convert sa_data to flexible array in struct sockaddr	2024-03-01 13:21:59 +01:00
devlink.c	devlink: report devlink_port_type_warn source device	2024-03-01 13:21:55 +01:00
drop_monitor.c	drop_monitor: Require 'CAP_SYS_ADMIN' when joining "events" group	2023-12-13 18:36:38 +01:00
dst.c	ipv6: remove max_size check inline with ipv4	2024-01-15 18:51:25 +01:00
dst_cache.c	wireguard: device: reset peer src endpoint when netns exits	2021-12-08 09:04:46 +01:00
failover.c	…
fib_notifier.c	…
fib_rules.c	ipv6: fix memory leak in fib6_rule_suppress	2021-12-08 09:04:43 +01:00
filter.c	xdp: use flags field to disambiguate broadcast redirect	2024-05-17 11:50:47 +02:00
flow_dissector.c	net/core: Fix ETH_P_1588 flow dissector	2023-10-06 13:18:05 +02:00
flow_offload.c	netfilter: nf_tables: bail out early if hardware offload is not supported	2022-06-14 18:36:17 +02:00
gen_estimator.c	net_sched: gen_estimator: support large ewma log	2021-01-15 18:11:06 -08:00
gen_stats.c	…
gro_cells.c	net: Fix data-races around netdev_max_backlog.	2022-08-31 17:16:42 +02:00
hwbm.c	…
link_watch.c	net: Write lock dev_base_lock without disabling bottom halves.	2022-06-29 09:03:22 +02:00
lwt_bpf.c	lwt: Fix return values of BPF xmit ops	2023-09-19 12:22:33 +02:00
lwtunnel.c	lwtunnel: Validate RTA_ENCAP_TYPE attribute length	2022-01-11 15:35:14 +01:00
neighbour.c	neighbour: Don't let neigh_forced_gc() disable preemption for long	2024-01-25 14:52:29 -08:00
net-procfs.c	net-procfs: show net devices bound packet types	2022-02-01 17:27:08 +01:00
net-sysfs.c	net: fix data-race in dev_isalive()	2022-06-29 09:03:22 +02:00
net-sysfs.h	…
net-traces.c	tcp: add tracepoint for checksum errors	2021-05-14 15:26:03 -07:00
net_namespace.c	net: fix out-of-bounds access in ops_init	2024-05-17 11:51:05 +02:00
netclassid_cgroup.c	bpf, cgroups: Fix cgroup v2 fallback on v1/v2 mixed mode	2021-09-13 16:35:58 -07:00
netevent.c	net: core: Correct function name netevent_unregister_notifier() in the kerneldoc	2021-03-28 17:56:56 -07:00
netpoll.c	net: move from strlcpy with unused retval to strscpy	2023-10-25 11:59:01 +02:00
netprio_cgroup.c	bpf, cgroups: Fix cgroup v2 fallback on v1/v2 mixed mode	2021-09-13 16:35:58 -07:00
of_net.c	of: net: add a helper for loading netdev->dev_addr	2023-07-27 08:46:59 +02:00
page_pool.c	page_pool: fix inconsistency for page_pool_ring_[un]lock()	2023-06-05 09:21:22 +02:00
pktgen.c	net: pktgen: Fix interface flags printing	2023-10-25 11:58:58 +02:00
ptp_classifier.c	bpf: Refactor BPF_PROG_RUN into a function	2021-08-17 00:45:07 +02:00
request_sock.c	tcp: make sure init the accept_queue's spinlocks once	2024-02-23 08:54:27 +01:00
rtnetlink.c	rtnetlink: Correct nested IFLA_VF_VLAN_LIST attribute validation	2024-05-17 11:50:58 +02:00
scm.c	io_uring/unix: drop usage of io_uring socket	2024-03-26 18:21:11 -04:00
secure_seq.c	tcp: Fix data-races around sysctl knobs related to SYN option.	2022-07-29 17:25:22 +02:00
selftests.c	net: selftests: add MTU test	2021-07-22 00:52:04 -07:00
skbuff.c	net: core: reject skb_copy(_expand) for fraglist GSO skbs	2024-05-17 11:50:50 +02:00
skmsg.c	bpf, sockmap: Improved check for empty queue	2024-05-17 11:50:56 +02:00
sock.c	net: mark racy access on sk->sk_rcvbuf	2024-05-17 11:50:52 +02:00
sock_destructor.h	skb_expand_head() adjust skb->truesize incorrectly	2021-10-22 12:35:51 -07:00
sock_diag.c	sock_diag: annotate data-races around sock_diag_handlers[family]	2024-03-26 18:21:17 -04:00
sock_map.c	bpf, sockmap: Convert schedule_work into delayed_work	2024-05-17 11:50:56 +02:00
sock_reuseport.c	soreuseport: Fix socket selection for SO_INCOMING_CPU.	2022-12-31 13:14:07 +01:00
stream.c	net: deal with most data-races in sk_wait_event()	2023-05-24 17:36:42 +01:00
sysctl_net_core.c	net: Fix data-races around weight_p and dev_weight_[rt]x_bias.	2022-08-31 17:16:42 +02:00
timestamping.c	…
tso.c	…
utils.c	…
xdp.c	xdp: xdp_mem_allocator can be NULL in trace_mem_connect().	2023-06-05 09:21:23 +02:00