c353e8983e0dea5dbba7789033326e1ad34135b7 is the first bad commit commit c353e8983e0dea5dbba7789033326e1ad34135b7 Author: Paolo Abeni Date: Thu Mar 20 19:22:38 2025 +0100 net: introduce per netns packet chains 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 Signed-off-by: Paolo Abeni Reviewed-by: Eric Dumazet Link: https://patch.msgid.link/ae405f98875ee87f8150c460ad162de7e466f8a7.1742494826.git.pabeni@redhat.com Signed-off-by: Jakub Kicinski include/linux/netdevice.h | 12 +++++++++- include/net/hotdata.h | 1 - include/net/net_namespace.h | 3 +++ net/core/dev.c | 53 +++++++++++++++++++++++++++++++++++---------- net/core/hotdata.c | 1 - net/core/net-procfs.c | 28 ++++++++++++++++++------ net/core/net_namespace.c | 2 ++ 7 files changed, 78 insertions(+), 22 deletions(-)