Re: [PATCH net-next 5/9] vxlan: move VXLAN_F_MDB to struct vxlan_dev flags

On Thu, Sep 3, 2026 at 5:08 AM Eric Dumazet [off-list ref] wrote:

VXLAN_F_MDB is an internal runtime state flag indicating whether any
MDB entries are configured on the device, rather than a netlink
configuration attribute.

In preparation for converting vxlan->cfg to an RCU-protected pointer,
move VXLAN_F_MDB from struct vxlan_config to a dedicated 'flags' field
in struct vxlan_dev as VXLAN_DEV_F_MDB, using atomic bitops (set_bit(),
clear_bit(), test_bit()) to avoid KCSAN data races between the TX path
and RTNL operations.

This avoids having to dynamically reallocate and publish a new
vxlan_config structure via RCU whenever the first MDB entry is added
or the last one is removed, and prevents potential memory allocation
failures during MDB teardown under memory pressure.

Signed-off-by: Eric Dumazet <edumazet@google.com>

Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>