diff mbox series

[bpf-next,2/2,v2] bpf: Add BPF_CALL_FUNC to simplify code

Message ID 20241002152320.388623-1-chen.dylane@gmail.com (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series [bpf-next,1/2,v2] bpf: Simplify code with BPF_CALL_IMM | expand

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Commit Message

Tao Chen Oct. 2, 2024, 3:23 p.m. UTC 
No logic changed, like macro BPF_CALL_IMM, add BPF_CALL_FUNC
to simplify code.

Signed-off-by: Tao Chen <chen.dylane@gmail.com>
---
 arch/sparc/net/bpf_jit_comp_64.c | 2 +-
 arch/x86/net/bpf_jit_comp.c      | 2 +-
 arch/x86/net/bpf_jit_comp32.c    | 5 ++---
 include/linux/filter.h           | 2 ++
 kernel/bpf/core.c                | 2 +-
 5 files changed, 7 insertions(+), 6 deletions(-)

Change list:
- v2 -> v1:
    - fix compile error reported by kernel test robot

Comments

Alexei Starovoitov Oct. 2, 2024, 3:37 p.m. UTC | #1 
On Wed, Oct 2, 2024 at 8:23 AM Tao Chen <chen.dylane@gmail.com> wrote:
>
> No logic changed, like macro BPF_CALL_IMM, add BPF_CALL_FUNC
> to simplify code.
>
> Signed-off-by: Tao Chen <chen.dylane@gmail.com>
> ---
>  arch/sparc/net/bpf_jit_comp_64.c | 2 +-
>  arch/x86/net/bpf_jit_comp.c      | 2 +-
>  arch/x86/net/bpf_jit_comp32.c    | 5 ++---
>  include/linux/filter.h           | 2 ++
>  kernel/bpf/core.c                | 2 +-
>  5 files changed, 7 insertions(+), 6 deletions(-)
>
> Change list:
> - v2 -> v1:
>     - fix compile error reported by kernel test robot
>
> diff --git a/arch/sparc/net/bpf_jit_comp_64.c b/arch/sparc/net/bpf_jit_comp_64.c
> index 73bf0aea8baf..076b1f216360 100644
> --- a/arch/sparc/net/bpf_jit_comp_64.c
> +++ b/arch/sparc/net/bpf_jit_comp_64.c
> @@ -1213,7 +1213,7 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
>         /* function call */
>         case BPF_JMP | BPF_CALL:
>         {
> -               u8 *func = ((u8 *)__bpf_call_base) + imm;
> +               u8 *func = BPF_CALL_FUNC(imm);
>
>                 ctx->saw_call = true;
>
> diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
> index 06b080b61aa5..052e5cc65fc0 100644
> --- a/arch/x86/net/bpf_jit_comp.c
> +++ b/arch/x86/net/bpf_jit_comp.c
> @@ -2126,7 +2126,7 @@ st:                       if (is_imm8(insn->off))
>                 case BPF_JMP | BPF_CALL: {
>                         u8 *ip = image + addrs[i - 1];
>
> -                       func = (u8 *) __bpf_call_base + imm32;
> +                       func = BPF_CALL_FUNC(imm32);
>                         if (tail_call_reachable) {
>                                 LOAD_TAIL_CALL_CNT_PTR(bpf_prog->aux->stack_depth);
>                                 ip += 7;
> diff --git a/arch/x86/net/bpf_jit_comp32.c b/arch/x86/net/bpf_jit_comp32.c
> index de0f9e5f9f73..f7277639bd2c 100644
> --- a/arch/x86/net/bpf_jit_comp32.c
> +++ b/arch/x86/net/bpf_jit_comp32.c
> @@ -1627,8 +1627,7 @@ static int emit_kfunc_call(const struct bpf_prog *bpf_prog, u8 *end_addr,
>         /* mov dword ptr [ebp+off],eax */
>         if (fm->ret_size)
>                 end_addr -= 3;
> -
> -       jmp_offset = (u8 *)__bpf_call_base + insn->imm - end_addr;
> +       jmp_offset = BPF_CALL_FUNC(insn->imm) - end_addr;
>         if (!is_simm32(jmp_offset)) {
>                 pr_err("unsupported BPF kernel function jmp_offset:%lld\n",
>                        jmp_offset);
> @@ -2103,7 +2102,7 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
>                                 break;
>                         }
>
> -                       func = (u8 *) __bpf_call_base + imm32;
> +                       func = BPF_CALL_FUNC(imm32);
>                         jmp_offset = func - (image + addrs[i]);
>
>                         if (!imm32 || !is_simm32(jmp_offset)) {
> diff --git a/include/linux/filter.h b/include/linux/filter.h
> index 99b6fc83825b..9924b581aa71 100644
> --- a/include/linux/filter.h
> +++ b/include/linux/filter.h
> @@ -461,6 +461,8 @@ static inline bool insn_is_cast_user(const struct bpf_insn *insn)
>
>  #define BPF_CALL_IMM(x)        ((void *)(x) - (void *)__bpf_call_base)
>
> +#define BPF_CALL_FUNC(x)       ((x) + (u8 *)__bpf_call_base)
> +

I don't like to hide code behind macros.
The code is cleaner as-is.

pw-bot: cr
diff mbox series

Patch

diff --git a/arch/sparc/net/bpf_jit_comp_64.c b/arch/sparc/net/bpf_jit_comp_64.c
index 73bf0aea8baf..076b1f216360 100644
--- a/arch/sparc/net/bpf_jit_comp_64.c
+++ b/arch/sparc/net/bpf_jit_comp_64.c
@@ -1213,7 +1213,7 @@  static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
 	/* function call */
 	case BPF_JMP | BPF_CALL:
 	{
-		u8 *func = ((u8 *)__bpf_call_base) + imm;
+		u8 *func = BPF_CALL_FUNC(imm);
 
 		ctx->saw_call = true;
 
diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index 06b080b61aa5..052e5cc65fc0 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -2126,7 +2126,7 @@  st:			if (is_imm8(insn->off))
 		case BPF_JMP | BPF_CALL: {
 			u8 *ip = image + addrs[i - 1];
 
-			func = (u8 *) __bpf_call_base + imm32;
+			func = BPF_CALL_FUNC(imm32);
 			if (tail_call_reachable) {
 				LOAD_TAIL_CALL_CNT_PTR(bpf_prog->aux->stack_depth);
 				ip += 7;
diff --git a/arch/x86/net/bpf_jit_comp32.c b/arch/x86/net/bpf_jit_comp32.c
index de0f9e5f9f73..f7277639bd2c 100644
--- a/arch/x86/net/bpf_jit_comp32.c
+++ b/arch/x86/net/bpf_jit_comp32.c
@@ -1627,8 +1627,7 @@  static int emit_kfunc_call(const struct bpf_prog *bpf_prog, u8 *end_addr,
 	/* mov dword ptr [ebp+off],eax */
 	if (fm->ret_size)
 		end_addr -= 3;
-
-	jmp_offset = (u8 *)__bpf_call_base + insn->imm - end_addr;
+	jmp_offset = BPF_CALL_FUNC(insn->imm) - end_addr;
 	if (!is_simm32(jmp_offset)) {
 		pr_err("unsupported BPF kernel function jmp_offset:%lld\n",
 		       jmp_offset);
@@ -2103,7 +2102,7 @@  static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
 				break;
 			}
 
-			func = (u8 *) __bpf_call_base + imm32;
+			func = BPF_CALL_FUNC(imm32);
 			jmp_offset = func - (image + addrs[i]);
 
 			if (!imm32 || !is_simm32(jmp_offset)) {
diff --git a/include/linux/filter.h b/include/linux/filter.h
index 99b6fc83825b..9924b581aa71 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -461,6 +461,8 @@  static inline bool insn_is_cast_user(const struct bpf_insn *insn)
 
 #define BPF_CALL_IMM(x)	((void *)(x) - (void *)__bpf_call_base)
 
+#define BPF_CALL_FUNC(x)	((x) + (u8 *)__bpf_call_base)
+
 #define BPF_EMIT_CALL(FUNC)					\
 	((struct bpf_insn) {					\
 		.code  = BPF_JMP | BPF_CALL,			\
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 4e07cc057d6f..9832e878fbb3 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -1278,7 +1278,7 @@  int bpf_jit_get_func_addr(const struct bpf_prog *prog,
 		 * and the helper with imm relative to it are both in core
 		 * kernel.
 		 */
-		addr = (u8 *)__bpf_call_base + imm;
+		addr = BPF_CALL_FUNC(imm);
 	}
 
 	*func_addr = (unsigned long)addr;