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Date: Thu, 16 Feb 2017 22:24:49 +0100
From: Daniel Borkmann <daniel@...earbox.net>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, ast@...nel.org,
Daniel Borkmann <daniel@...earbox.net>
Subject: [PATCH net-next 2/3] bpf: remove stubs for cBPF from arch code
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@...earbox.net>
Acked-by: Alexei Starovoitov <ast@...nel.org>
---
arch/arm64/net/bpf_jit_comp.c | 5 -----
arch/powerpc/net/bpf_jit_comp64.c | 2 --
arch/s390/net/bpf_jit_comp.c | 8 --------
arch/x86/net/bpf_jit_comp.c | 8 ++------
include/linux/filter.h | 6 +-----
kernel/bpf/core.c | 12 +++++++++++-
6 files changed, 14 insertions(+), 27 deletions(-)
diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c
index b2fc97a..c444408 100644
--- a/arch/arm64/net/bpf_jit_comp.c
+++ b/arch/arm64/net/bpf_jit_comp.c
@@ -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;
diff --git a/arch/powerpc/net/bpf_jit_comp64.c b/arch/powerpc/net/bpf_jit_comp64.c
index 73a5cf1..f9ebd02 100644
--- a/arch/powerpc/net/bpf_jit_comp64.c
+++ b/arch/powerpc/net/bpf_jit_comp64.c
@@ -961,8 +961,6 @@ static int bpf_jit_build_body(struct bpf_prog *fp, u32 *image,
return 0;
}
-void bpf_jit_compile(struct bpf_prog *fp) { }
-
struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp)
{
u32 proglen;
diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c
index 167b31b..6454efd 100644
--- a/arch/s390/net/bpf_jit_comp.c
+++ b/arch/s390/net/bpf_jit_comp.c
@@ -1263,14 +1263,6 @@ static int bpf_jit_prog(struct bpf_jit *jit, struct bpf_prog *fp)
}
/*
- * 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"
*/
struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp)
diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index bb660e5..26123d0 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -1067,13 +1067,13 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
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 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
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;
diff --git a/include/linux/filter.h b/include/linux/filter.h
index e4eb254..c7a70e0 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -607,6 +607,7 @@ int sk_get_filter(struct sock *sk, struct sock_filter __user *filter,
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 @@ struct bpf_binary_header *
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);
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index fddd76b..2831ba1 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -1154,12 +1154,22 @@ const struct bpf_func_proto * __weak bpf_get_trace_printk_proto(void)
.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;
--
1.9.3
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