[PATCH bpf-next 0/2] Enable the inline of kptr_xchg for arm64

[PATCH bpf-next 0/2] Enable the inline of kptr_xchg for arm64

[Hou Tao]

From: Hou Tao <houtao1@huawei.com>

Hi,

The patch set is just a follow-up for "bpf: inline bpf_kptr_xchg()". It
enables the inline of bpf_kptr_xchg() and kptr_xchg_inline test for
arm64.

Please see individual patches for more details. And comments are always
welcome.

Hou Tao (2):
  bpf, arm64: Enable the inline of bpf_kptr_xchg()
  selftests/bpf: Enable kptr_xchg_inline test for arm64

 arch/arm64/net/bpf_jit_comp.c                             | 5 +++++
 tools/testing/selftests/bpf/prog_tests/kptr_xchg_inline.c | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

-- 
2.29.2

[PATCH bpf-next 1/2] bpf, arm64: Enable the inline of bpf_kptr_xchg()

[Hou Tao]

From: Hou Tao <houtao1@huawei.com>

ARM64 bpf jit satisfies the following two conditions:
1) support BPF_XCHG() on pointer-sized word.
2) the implementation of xchg is the same as atomic_xchg() on
   pointer-sized words. Both of these two functions use arch_xchg() to
   implement the exchange.

So enable the inline of bpf_kptr_xchg() for arm64 bpf jit.

Signed-off-by: Hou Tao <houtao1@huawei.com>
---
 arch/arm64/net/bpf_jit_comp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c
index 8955da5c47cf7..cfd5434de4832 100644
--- a/arch/arm64/net/bpf_jit_comp.c
+++ b/arch/arm64/net/bpf_jit_comp.c
@@ -2305,3 +2305,8 @@ int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type poke_type,
 
 	return ret;
 }
+
+bool bpf_jit_supports_ptr_xchg(void)
+{
+	return true;
+}
-- 
2.29.2

[PATCH bpf-next 2/2] selftests/bpf: Enable kptr_xchg_inline test for arm64

[Hou Tao]

From: Hou Tao <houtao1@huawei.com>

Now arm64 bpf jit has enable bpf_jit_supports_ptr_xchg(), so enable
the test for arm64 as well.

Signed-off-by: Hou Tao <houtao1@huawei.com>
---
 tools/testing/selftests/bpf/prog_tests/kptr_xchg_inline.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/kptr_xchg_inline.c b/tools/testing/selftests/bpf/prog_tests/kptr_xchg_inline.c
index 5a4bee1cf9707..15144943e88b7 100644
--- a/tools/testing/selftests/bpf/prog_tests/kptr_xchg_inline.c
+++ b/tools/testing/selftests/bpf/prog_tests/kptr_xchg_inline.c
@@ -13,7 +13,7 @@ void test_kptr_xchg_inline(void)
 	unsigned int cnt;
 	int err;
 
-#if !defined(__x86_64__)
+#if !(defined(__x86_64__) || defined(__aarch64__))
 	test__skip();
 	return;
 #endif
-- 
2.29.2

Re: [PATCH bpf-next 0/2] Enable the inline of kptr_xchg for arm64

[patchwork-bot+netdevbpf]

Hello:

This series was applied to bpf/bpf-next.git (master)
by Alexei Starovoitov <ast@kernel.org>:

On Fri, 19 Jan 2024 18:25:27 +0800 you wrote:
> From: Hou Tao <houtao1@huawei.com>
> 
> Hi,
> 
> The patch set is just a follow-up for "bpf: inline bpf_kptr_xchg()". It
> enables the inline of bpf_kptr_xchg() and kptr_xchg_inline test for
> arm64.
> 
> [...]

Here is the summary with links:
  - [bpf-next,1/2] bpf, arm64: Enable the inline of bpf_kptr_xchg()
    https://git.kernel.org/bpf/bpf-next/c/18a45f12d746
  - [bpf-next,2/2] selftests/bpf: Enable kptr_xchg_inline test for arm64
    https://git.kernel.org/bpf/bpf-next/c/29f868887a7d

You are awesome, thank you!
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