Stanislav Fomichev a9ed15dae0
bpf: Split cgroup_bpf_enabled per attach type ...
When we attach any cgroup hook, the rest (even if unused/unattached) start
to contribute small overhead. In particular, the one we want to avoid is
__cgroup_bpf_run_filter_skb which does two redirections to get to
the cgroup and pushes/pulls skb.
Let's split cgroup_bpf_enabled to be per-attach to make sure
only used attach types trigger.
I've dropped some existing high-level cgroup_bpf_enabled in some
places because BPF_PROG_CGROUP_XXX_RUN macros usually have another
cgroup_bpf_enabled check.
I also had to copy-paste BPF_CGROUP_RUN_SA_PROG_LOCK for
GETPEERNAME/GETSOCKNAME because type for cgroup_bpf_enabled[type]
has to be constant and known at compile time.
Signed-off-by: Stanislav Fomichev <sdf@google.com >
Signed-off-by: Alexei Starovoitov <ast@kernel.org >
Acked-by: Song Liu <songliubraving@fb.com >
Link: https://lore.kernel.org/bpf/20210115163501.805133-4-sdf@google.com
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Stanislav Fomichev
a9ed15dae0