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bpf: remove stubs for cBPF from arch code

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Remove the dummy bpf_jit_compile() stubs for eBPF JITs and make
that a single __weak function in the core that can be overridden
similarly to the eBPF one. Also remove stale pr_err() mentions
of bpf_jit_compile.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2017-02-16 22:24:49 +01:00 committed by David S. Miller
parent c78f8bdfa1
commit 9383191da4
6 changed files with 14 additions and 27 deletions
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5
arch/arm64/net/bpf_jit_comp.c
View File

@ -813,11 +813,6 @@ static inline void bpf_flush_icache(void *start, void *end)
flush_icache_range((unsigned long)start, (unsigned long)end);
}
void bpf_jit_compile(struct bpf_prog *prog)
{
/* Nothing to do here. We support Internal BPF. */
}
struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
{
struct bpf_prog *tmp, *orig_prog = prog;

2
arch/powerpc/net/bpf_jit_comp64.c
View File

@ -961,8 +961,6 @@ common_load:
return 0;
}
void bpf_jit_compile(struct bpf_prog *fp) { }
struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp)
{
u32 proglen;

8
arch/s390/net/bpf_jit_comp.c
View File

@ -1262,14 +1262,6 @@ static int bpf_jit_prog(struct bpf_jit *jit, struct bpf_prog *fp)
return 0;
}
/*
* Classic BPF function stub. BPF programs will be converted into
* eBPF and then bpf_int_jit_compile() will be called.
*/
void bpf_jit_compile(struct bpf_prog *fp)
{
}
/*
* Compile eBPF program "fp"
*/

8
arch/x86/net/bpf_jit_comp.c
View File

@ -1067,13 +1067,13 @@ common_load:
ilen = prog - temp;
if (ilen > BPF_MAX_INSN_SIZE) {
pr_err("bpf_jit_compile fatal insn size error\n");
pr_err("bpf_jit: fatal insn size error\n");
return -EFAULT;
}
if (image) {
if (unlikely(proglen + ilen > oldproglen)) {
pr_err("bpf_jit_compile fatal error\n");
pr_err("bpf_jit: fatal error\n");
return -EFAULT;
}
memcpy(image + proglen, temp, ilen);
@ -1085,10 +1085,6 @@ common_load:
return proglen;
}
void bpf_jit_compile(struct bpf_prog *prog)
{
}
struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
{
struct bpf_binary_header *header = NULL;

6
include/linux/filter.h
View File

@ -607,6 +607,7 @@ void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp);
u64 __bpf_call_base(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog);
void bpf_jit_compile(struct bpf_prog *prog);
bool bpf_helper_changes_pkt_data(void *func);
struct bpf_prog *bpf_patch_insn_single(struct bpf_prog *prog, u32 off,
@ -625,7 +626,6 @@ bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr,
bpf_jit_fill_hole_t bpf_fill_ill_insns);
void bpf_jit_binary_free(struct bpf_binary_header *hdr);
void bpf_jit_compile(struct bpf_prog *fp);
void bpf_jit_free(struct bpf_prog *fp);
struct bpf_prog *bpf_jit_blind_constants(struct bpf_prog *fp);
@ -669,10 +669,6 @@ static inline bool bpf_jit_blinding_enabled(void)
return true;
}
#else
static inline void bpf_jit_compile(struct bpf_prog *fp)
{
}
static inline void bpf_jit_free(struct bpf_prog *fp)
{
bpf_prog_unlock_free(fp);

12
kernel/bpf/core.c
View File

@ -1154,12 +1154,22 @@ const struct bpf_func_proto bpf_tail_call_proto = {
.arg3_type = ARG_ANYTHING,
};
/* For classic BPF JITs that don't implement bpf_int_jit_compile(). */
/* Stub for JITs that only support cBPF. eBPF programs are interpreted.
* It is encouraged to implement bpf_int_jit_compile() instead, so that
* eBPF and implicitly also cBPF can get JITed!
*/
struct bpf_prog * __weak bpf_int_jit_compile(struct bpf_prog *prog)
{
return prog;
}
/* Stub for JITs that support eBPF. All cBPF code gets transformed into
* eBPF by the kernel and is later compiled by bpf_int_jit_compile().
*/
void __weak bpf_jit_compile(struct bpf_prog *prog)
{
}
bool __weak bpf_helper_changes_pkt_data(void *func)
{
return false;