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bpf: allow offload of programs with BPF-to-BPF function calls 

Now that there is at least one driver supporting BPF-to-BPF function
calls, lift the restriction, in the verifier, on hardware offload of
eBPF programs containing such calls. But prevent jit_subprogs(), still
in the verifier, from being run for offloaded programs.

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jiong Wang <jiong.wang@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Quentin Monnet 2018-10-07 12:56:58 +01:00 committed by Daniel Borkmann
parent 7ff0ccde43
commit e4052d06a5
1 changed files with 3 additions and 7 deletions
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10
kernel/bpf/verifier.c
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@ -1009,10 +1009,6 @@ static int check_subprogs(struct bpf_verifier_env *env)
verbose(env, "function calls to other bpf functions are allowed for root only\n");
return -EPERM;
}
if (bpf_prog_is_dev_bound(env->prog->aux)) {
verbose(env, "function calls in offloaded programs are not supported yet\n");
return -EINVAL;
}
ret = add_subprog(env, i + insn[i].imm + 1);
if (ret < 0)
return ret;
@ -5968,10 +5964,10 @@ static int fixup_call_args(struct bpf_verifier_env *env)
struct bpf_insn *insn = prog->insnsi;
int i, depth;
#endif
int err;
int err = 0;
err = 0;
if (env->prog->jit_requested) {
if (env->prog->jit_requested &&
!bpf_prog_is_dev_bound(env->prog->aux)) {
err = jit_subprogs(env);
if (err == 0)
return 0;