From: Hari Bathini <hbathini@linux.ibm.com>
To: bpf@vger.kernel.org, linuxppc-dev <linuxppc-dev@lists.ozlabs.org>
Cc: Song Liu <songliubraving@fb.com>,
Daniel Borkmann <daniel@iogearbox.net>,
John Fastabend <john.fastabend@gmail.com>,
Alexei Starovoitov <ast@kernel.org>,
Andrii Nakryiko <andrii@kernel.org>,
netdev@vger.kernel.org, Paul Mackerras <paulus@samba.org>,
"Naveen N. Rao" <naveen.n.rao@linux.ibm.com>,
Yonghong Song <yhs@fb.com>, KP Singh <kpsingh@kernel.org>,
Jordan Niethe <jniethe5@gmail.com>,
Martin KaFai Lau <kafai@fb.com>
Subject: [PATCH v2 2/5] bpf ppc64: add support for atomic fetch operations
Date: Fri, 10 Jun 2022 21:25:49 +0530 [thread overview]
Message-ID: <20220610155552.25892-3-hbathini@linux.ibm.com> (raw)
In-Reply-To: <20220610155552.25892-1-hbathini@linux.ibm.com>
Adding instructions for ppc64 for
atomic[64]_fetch_add
atomic[64]_fetch_and
atomic[64]_fetch_or
atomic[64]_fetch_xor
Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
---
* No changes in v2.
arch/powerpc/net/bpf_jit_comp64.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/net/bpf_jit_comp64.c b/arch/powerpc/net/bpf_jit_comp64.c
index c421bedd0e98..c53236b3a8b1 100644
--- a/arch/powerpc/net/bpf_jit_comp64.c
+++ b/arch/powerpc/net/bpf_jit_comp64.c
@@ -787,17 +787,25 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *
else
EMIT(PPC_RAW_LWARX(tmp2_reg, tmp1_reg, dst_reg, 0));
+ /* Save old value in _R0 */
+ if (imm & BPF_FETCH)
+ EMIT(PPC_RAW_MR(_R0, tmp2_reg));
+
switch (imm) {
case BPF_ADD:
+ case BPF_ADD | BPF_FETCH:
EMIT(PPC_RAW_ADD(tmp2_reg, tmp2_reg, src_reg));
break;
case BPF_AND:
+ case BPF_AND | BPF_FETCH:
EMIT(PPC_RAW_AND(tmp2_reg, tmp2_reg, src_reg));
break;
case BPF_OR:
+ case BPF_OR | BPF_FETCH:
EMIT(PPC_RAW_OR(tmp2_reg, tmp2_reg, src_reg));
break;
case BPF_XOR:
+ case BPF_XOR | BPF_FETCH:
EMIT(PPC_RAW_XOR(tmp2_reg, tmp2_reg, src_reg));
break;
default:
@@ -807,13 +815,17 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *
return -EOPNOTSUPP;
}
- /* store result back */
+ /* store new value */
if (size == BPF_DW)
EMIT(PPC_RAW_STDCX(tmp2_reg, tmp1_reg, dst_reg));
else
EMIT(PPC_RAW_STWCX(tmp2_reg, tmp1_reg, dst_reg));
/* we're done if this succeeded */
PPC_BCC_SHORT(COND_NE, tmp_idx);
+
+ /* For the BPF_FETCH variant, get old value into src_reg */
+ if (imm & BPF_FETCH)
+ EMIT(PPC_RAW_MR(src_reg, _R0));
break;
/*
--
2.35.3
next prev parent reply other threads:[~2022-06-10 15:58 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-10 15:55 [PATCH v2 0/5] Atomics support for eBPF on powerpc Hari Bathini
2022-06-10 15:55 ` [PATCH v2 1/5] bpf ppc64: add support for BPF_ATOMIC bitwise operations Hari Bathini
2022-06-10 15:55 ` Hari Bathini [this message]
2022-06-10 15:55 ` [PATCH v2 3/5] bpf ppc64: Add instructions for atomic_[cmp]xchg Hari Bathini
2022-06-10 15:55 ` [PATCH v2 4/5] bpf ppc32: add support for BPF_ATOMIC bitwise operations Hari Bathini
2022-06-11 17:14 ` Christophe Leroy
2022-06-13 19:00 ` Hari Bathini
2022-06-10 15:55 ` [PATCH v2 5/5] bpf ppc32: Add instructions for atomic_[cmp]xchg Hari Bathini
2022-06-11 17:34 ` Christophe Leroy
2022-06-13 19:11 ` Hari Bathini
2022-06-13 19:14 ` Hari Bathini
2022-06-24 10:41 ` Naveen N. Rao
2022-06-24 10:37 ` [PATCH v2 0/5] Atomics support for eBPF on powerpc Naveen N. Rao
2022-07-04 11:33 ` Michael Ellerman
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