Andrii Nakryiko wrote:

Add LINK_DETACH command to force-detach bpf_link without destroying it. It has
the same behavior as auto-detaching of bpf_link due to cgroup dying for
bpf_cgroup_link or net_device being destroyed for bpf_xdp_link. In such case,
bpf_link is still a valid kernel object, but is defuncts and doesn't hold BPF
program attached to corresponding BPF hook. This functionality allows users
with enough access rights to manually force-detach attached bpf_link without
killing respective owner process.

This patch implements LINK_DETACH for cgroup, xdp, and netns links, mostly
re-using existing link release handling code.

Acked-by: Song Liu <redacted>
Signed-off-by: Andrii Nakryiko <redacted>
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Looks necessary otherwise we have no way, as far as I read it, to delete
an XDP program and go back the no prog state after link_{create|update}.

Acked-by: John Fastabend <john.fastabend@gmail.com>