bpf: Add bpf_cgroup_from_id() kfunc

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cgroup ID is an userspace-visible 64bit value uniquely identifying a given
cgroup. As the IDs are used widely, it's useful to be able to look up the
matching cgroups. Add bpf_cgroup_from_id().

v2: Separate out selftest into its own patch as suggested by Alexei.

Signed-off-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/Y/bBaG96t0/gQl9/@slm.duckdns.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Tejun Heo 2023-02-22 15:29:12 -10:00 • committed by Alexei Starovoitov

parent 746ce76712

commit 332ea1f697

2 changed files with 25 additions and 3 deletions

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10

Documentation/bpf/kfuncs.rst

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18

kernel/bpf/helpers.c

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