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net: add exit_batch_rtnl() method

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Many (struct pernet_operations)->exit_batch() methods have
to acquire rtnl.

In presence of rtnl mutex pressure, this makes cleanup_net()
very slow.

This patch adds a new exit_batch_rtnl() method to reduce
number of rtnl acquisitions from cleanup_net().

exit_batch_rtnl() handlers are called while rtnl is locked,
and devices to be killed can be queued in a list provided
as their second argument.

A single unregister_netdevice_many() is called right
before rtnl is released.

exit_batch_rtnl() handlers are called before ->exit() and
->exit_batch() handlers.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Antoine Tenart <atenart@kernel.org>
Link: https://lore.kernel.org/r/20240206144313.2050392-2-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet
2024-02-06 14:42:57 +00:00
committed by Jakub Kicinski
parent a1e55f5103
commit fd4f101edb
2 changed files with 33 additions and 1 deletions
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3
include/net/net_namespace.h
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@@ -448,6 +448,9 @@ struct pernet_operations {
void (*pre_exit)(struct net *net);
void (*exit)(struct net *net);
void (*exit_batch)(struct list_head *net_exit_list);
/* Following method is called with RTNL held. */
void (*exit_batch_rtnl)(struct list_head *net_exit_list,
struct list_head *dev_kill_list);
unsigned int *id;
size_t size;
};