[PATCH bpf-next] riscv, bpf: Optimize stack usage of trampoline

[PATCH bpf-next] riscv, bpf: Optimize stack usage of trampoline

[Puranjay Mohan]

When BPF_TRAMP_F_CALL_ORIG is not set, stack space for passing arguments
on stack doesn't need to be reserved because the original function is
not called.

Only reserve space for stacked arguments when BPF_TRAMP_F_CALL_ORIG is
set.

Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
---
 arch/riscv/net/bpf_jit_comp64.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/net/bpf_jit_comp64.c b/arch/riscv/net/bpf_jit_comp64.c
index 685c7389ae7e..0795efdd3519 100644
--- a/arch/riscv/net/bpf_jit_comp64.c
+++ b/arch/riscv/net/bpf_jit_comp64.c
@@ -892,7 +892,7 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
 	stack_size += 8;
 	sreg_off = stack_size;
 
-	if (nr_arg_slots - RV_MAX_REG_ARGS > 0)
+	if ((flags & BPF_TRAMP_F_CALL_ORIG) && (nr_arg_slots - RV_MAX_REG_ARGS > 0))
 		stack_size += (nr_arg_slots - RV_MAX_REG_ARGS) * 8;
 
 	stack_size = round_up(stack_size, STACK_ALIGN);
-- 
2.40.1


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Re: [PATCH bpf-next] riscv, bpf: Optimize stack usage of trampoline

[Pu Lehui]

On 2024/7/8 19:47, Puranjay Mohan wrote:
> When BPF_TRAMP_F_CALL_ORIG is not set, stack space for passing arguments
> on stack doesn't need to be reserved because the original function is
> not called.
> 
> Only reserve space for stacked arguments when BPF_TRAMP_F_CALL_ORIG is
> set.
> 
> Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
> ---
>   arch/riscv/net/bpf_jit_comp64.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/riscv/net/bpf_jit_comp64.c b/arch/riscv/net/bpf_jit_comp64.c
> index 685c7389ae7e..0795efdd3519 100644
> --- a/arch/riscv/net/bpf_jit_comp64.c
> +++ b/arch/riscv/net/bpf_jit_comp64.c
> @@ -892,7 +892,7 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
>   	stack_size += 8;
>   	sreg_off = stack_size;
>   
> -	if (nr_arg_slots - RV_MAX_REG_ARGS > 0)
> +	if ((flags & BPF_TRAMP_F_CALL_ORIG) && (nr_arg_slots - RV_MAX_REG_ARGS > 0))
>   		stack_size += (nr_arg_slots - RV_MAX_REG_ARGS) * 8;
>   
>   	stack_size = round_up(stack_size, STACK_ALIGN);

Thanks!

Acked-by: Pu Lehui <pulehui@huawei.com>

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Re: [PATCH bpf-next] riscv, bpf: Optimize stack usage of trampoline

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Daniel Borkmann <daniel@iogearbox.net>:

On Mon,  8 Jul 2024 11:47:58 +0000 you wrote:
> When BPF_TRAMP_F_CALL_ORIG is not set, stack space for passing arguments
> on stack doesn't need to be reserved because the original function is
> not called.
> 
> Only reserve space for stacked arguments when BPF_TRAMP_F_CALL_ORIG is
> set.
> 
> [...]

Here is the summary with links:
  - [bpf-next] riscv, bpf: Optimize stack usage of trampoline
    https://git.kernel.org/bpf/bpf-next/c/a5912c37faf7

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html



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Re: [PATCH bpf-next] riscv, bpf: Optimize stack usage of trampoline

[patchwork-bot+linux-riscv]

Hello:

This patch was applied to riscv/linux.git (for-next)
by Daniel Borkmann <daniel@iogearbox.net>:

On Mon,  8 Jul 2024 11:47:58 +0000 you wrote:
> When BPF_TRAMP_F_CALL_ORIG is not set, stack space for passing arguments
> on stack doesn't need to be reserved because the original function is
> not called.
> 
> Only reserve space for stacked arguments when BPF_TRAMP_F_CALL_ORIG is
> set.
> 
> [...]

Here is the summary with links:
  - [bpf-next] riscv, bpf: Optimize stack usage of trampoline
    https://git.kernel.org/riscv/c/a5912c37faf7

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html



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