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bpf: extend bpf_prog_array to store pointers to the cgroup storage

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This patch converts bpf_prog_array from an array of prog pointers
to the array of struct bpf_prog_array_item elements.

This allows to save a cgroup storage pointer for each bpf program
efficiently attached to a cgroup.

Signed-off-by: Roman Gushchin <guro@fb.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Roman Gushchin
2018-08-02 14:27:21 -07:00
committed by Daniel Borkmann
parent d7bf2c10af
commit 394e40a297
4 changed files with 70 additions and 56 deletions
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21
kernel/bpf/cgroup.c
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@@ -117,15 +117,18 @@ static int compute_effective_progs(struct cgroup *cgrp,
cnt = 0;
p = cgrp;
do {
if (cnt == 0 || (p->bpf.flags[type] & BPF_F_ALLOW_MULTI))
list_for_each_entry(pl,
&p->bpf.progs[type], node) {
if (!pl->prog)
continue;
progs->progs[cnt++] = pl->prog;
}
p = cgroup_parent(p);
} while (p);
if (cnt > 0 && !(p->bpf.flags[type] & BPF_F_ALLOW_MULTI))
continue;
list_for_each_entry(pl, &p->bpf.progs[type], node) {
if (!pl->prog)
continue;
progs->items[cnt].prog = pl->prog;
progs->items[cnt].cgroup_storage = pl->storage;
cnt++;
}
} while ((p = cgroup_parent(p)));
rcu_assign_pointer(*array, progs);
return 0;