From: Song Liu <song@kernel.org>
To: <bpf@vger.kernel.org>
Cc: <ast@kernel.org>, <daniel@iogearbox.net>, <andrii@kernel.org>,
<martin.lau@linux.dev>, <kernel-team@meta.com>,
<iii@linux.ibm.com>, Song Liu <song@kernel.org>
Subject: [PATCH bpf 1/2] s390/bpf: Let arch_prepare_bpf_trampoline return program size
Date: Mon, 18 Sep 2023 23:02:57 -0700 [thread overview]
Message-ID: <20230919060258.3237176-2-song@kernel.org> (raw)
In-Reply-To: <20230919060258.3237176-1-song@kernel.org>
arch_prepare_bpf_trampoline() for s390 currently returns 0 on success. This
is not a problem for regular trampoline. However, struct_ops relies on the
return value to advance "image" pointer:
bpf_struct_ops_map_update_elem() {
...
for_each_member(i, t, member) {
...
err = bpf_struct_ops_prepare_trampoline();
...
image += err;
}
}
When arch_prepare_bpf_trampoline returns 0 on success, all members of the
struct_ops will point to the same trampoline (the last one).
Fix this by returning the program size in arch_prepare_bpf_trampoline (on
success). This is the same behavior as other architectures.
Signed-off-by: Song Liu <song@kernel.org>
---
arch/s390/net/bpf_jit_comp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c
index de2fb12120d2..2861e3360aff 100644
--- a/arch/s390/net/bpf_jit_comp.c
+++ b/arch/s390/net/bpf_jit_comp.c
@@ -2513,7 +2513,7 @@ int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image,
return -E2BIG;
}
- return ret;
+ return tjit.common.prg;
}
bool bpf_jit_supports_subprog_tailcalls(void)
--
2.34.1
next prev parent reply other threads:[~2023-09-19 6:03 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-19 6:02 [PATCH bpf 0/2] s390/bpf: Fix arch_prepare_bpf_trampoline Song Liu
2023-09-19 6:02 ` Song Liu [this message]
2023-09-19 9:04 ` [PATCH bpf 1/2] s390/bpf: Let arch_prepare_bpf_trampoline return program size Ilya Leoshkevich
2023-09-19 6:02 ` [PATCH bpf 2/2] selftests/bpf: Check bpf_cubic_acked() is called via struct_ops Song Liu
2023-09-19 9:05 ` Ilya Leoshkevich
2023-09-19 10:10 ` [PATCH bpf 0/2] s390/bpf: Fix arch_prepare_bpf_trampoline patchwork-bot+netdevbpf
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