netlink: Avoid netlink mmap alloc if msg size exceeds frame size
An insufficent ring frame size configuration can lead to an unnecessary skb allocation for every Netlink message. Check frame size before taking the queue lock and allocating the skb and re-check with lock to be safe. Signed-off-by: NThomas Graf <tgraf@suug.ch> Reviewed-by: NDaniel Borkmann <dborkman@redhat.com> Signed-off-by: NJesse Gross <jesse@nicira.com>
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