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Message-ID: <20240206144313.2050392-1-edumazet@google.com>
Date: Tue, 6 Feb 2024 14:42:56 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: Antoine Tenart <atenart@...nel.org>, netdev@...r.kernel.org, eric.dumazet@...il.com,
Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH v4 net-next 00/15] net: more factorization in cleanup_net() paths
This series is inspired by recent syzbot reports hinting to RTNL and
workqueue abuses.
rtnl_lock() is unfair to (single threaded) cleanup_net(), because
many threads can cause contention on it.
This series adds a new (struct pernet_operations) method,
so that cleanup_net() can hold RTNL longer once it finally
acquires it.
It also factorizes unregister_netdevice_many(), to further
reduce stalls in cleanup_net().
v4: Changed geneve patch (Antoine Tenart feedback)
Changed vxlan patch (Paolo Abeni feedback)
Link: https://lore.kernel.org/netdev/CANn89iLJrrJs+6Vc==Un4rVKcpV0Eof4F_4w1_wQGxUCE2FWAg@mail.gmail.com/T/#u
v3: Dropped "net: convert default_device_exit_batch() to exit_batch_rtnl method"
Jakub (and KASAN) reported issues with bridge, but the root cause was with this patch.
default_device_exit_batch() is the catch-all method, it includes "lo" device dismantle.
v2: Antoine Tenart feedback in
https://lore.kernel.org/netdev/170688415193.5216.10499830272732622816@kwain/
- Added bond_net_pre_exit() method to make sure bond_destroy_sysfs()
is called before we unregister the devices in bond_net_exit_batch_rtnl()
Eric Dumazet (15):
net: add exit_batch_rtnl() method
nexthop: convert nexthop_net_exit_batch to exit_batch_rtnl method
bareudp: use exit_batch_rtnl() method
bonding: use exit_batch_rtnl() method
geneve: use exit_batch_rtnl() method
gtp: use exit_batch_rtnl() method
ipv4: add __unregister_nexthop_notifier()
vxlan: use exit_batch_rtnl() method
ip6_gre: use exit_batch_rtnl() method
ip6_tunnel: use exit_batch_rtnl() method
ip6_vti: use exit_batch_rtnl() method
sit: use exit_batch_rtnl() method
ip_tunnel: use exit_batch_rtnl() method
bridge: use exit_batch_rtnl() method
xfrm: interface: use exit_batch_rtnl() method
drivers/net/bareudp.c | 13 +++------
drivers/net/bonding/bond_main.c | 37 ++++++++++++++++--------
drivers/net/geneve.c | 23 +++++++--------
drivers/net/gtp.c | 20 ++++++-------
drivers/net/vxlan/vxlan_core.c | 50 +++++++++++++--------------------
include/net/ip_tunnels.h | 3 +-
include/net/net_namespace.h | 3 ++
include/net/nexthop.h | 1 +
net/bridge/br.c | 15 ++++------
net/core/net_namespace.c | 31 +++++++++++++++++++-
net/ipv4/ip_gre.c | 24 ++++++++++------
net/ipv4/ip_tunnel.c | 10 +++----
net/ipv4/ip_vti.c | 8 ++++--
net/ipv4/ipip.c | 8 ++++--
net/ipv4/nexthop.c | 38 ++++++++++++++++---------
net/ipv6/ip6_gre.c | 12 ++++----
net/ipv6/ip6_tunnel.c | 12 ++++----
net/ipv6/ip6_vti.c | 12 ++++----
net/ipv6/sit.c | 13 ++++-----
net/xfrm/xfrm_interface_core.c | 14 ++++-----
20 files changed, 190 insertions(+), 157 deletions(-)
--
2.43.0.594.gd9cf4e227d-goog
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