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net: introduce per netns packet chains

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Currently network taps unbound to any interface are linked in the
global ptype_all list, affecting the performance in all the network
namespaces.

Add per netns ptypes chains, so that in the mentioned case only
the netns owning the packet socket(s) is affected.

While at that drop the global ptype_all list: no in kernel user
registers a tap on "any" type without specifying either the target
device or the target namespace (and IMHO doing that would not make
any sense).

Note that this adds a conditional in the fast path (to check for
per netns ptype_specific list) and increases the dataset size by
a cacheline (owing the per netns lists).

Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Eric Dumazet <edumaze@google.com>
Link: https://patch.msgid.link/ae405f98875ee87f8150c460ad162de7e466f8a7.1742494826.git.pabeni@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Paolo Abeni
2025-03-20 19:22:38 +01:00
committed by Jakub Kicinski
parent 29abdf6625
commit c353e8983e
7 changed files with 78 additions and 22 deletions
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3
include/net/net_namespace.h
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@@ -83,6 +83,9 @@ struct net {
struct llist_node defer_free_list;
struct llist_node cleanup_list; /* namespaces on death row */
struct list_head ptype_all;
struct list_head ptype_specific;
#ifdef CONFIG_KEYS
struct key_tag *key_domain; /* Key domain of operation tag */
#endif