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 1/5] bpf ppc64: add support for BPF_ATOMIC bitwise operations
Date: Fri, 10 Jun 2022 21:25:48 +0530 [thread overview]
Message-ID: <20220610155552.25892-2-hbathini@linux.ibm.com> (raw)
In-Reply-To: <20220610155552.25892-1-hbathini@linux.ibm.com>
Adding instructions for ppc64 for
atomic[64]_and
atomic[64]_or
atomic[64]_xor
Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
---
* No changes in v2.
arch/powerpc/net/bpf_jit_comp64.c | 57 ++++++++++++++++---------------
1 file changed, 29 insertions(+), 28 deletions(-)
diff --git a/arch/powerpc/net/bpf_jit_comp64.c b/arch/powerpc/net/bpf_jit_comp64.c
index 594c54931e20..c421bedd0e98 100644
--- a/arch/powerpc/net/bpf_jit_comp64.c
+++ b/arch/powerpc/net/bpf_jit_comp64.c
@@ -777,41 +777,42 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *
* BPF_STX ATOMIC (atomic ops)
*/
case BPF_STX | BPF_ATOMIC | BPF_W:
- if (imm != BPF_ADD) {
- pr_err_ratelimited(
- "eBPF filter atomic op code %02x (@%d) unsupported\n",
- code, i);
- return -ENOTSUPP;
- }
-
- /* *(u32 *)(dst + off) += src */
-
- /* Get EA into TMP_REG_1 */
- EMIT(PPC_RAW_ADDI(tmp1_reg, dst_reg, off));
+ case BPF_STX | BPF_ATOMIC | BPF_DW:
+ /* Get offset into TMP_REG_1 */
+ EMIT(PPC_RAW_LI(tmp1_reg, off));
tmp_idx = ctx->idx * 4;
/* load value from memory into TMP_REG_2 */
- EMIT(PPC_RAW_LWARX(tmp2_reg, 0, tmp1_reg, 0));
- /* add value from src_reg into this */
- EMIT(PPC_RAW_ADD(tmp2_reg, tmp2_reg, src_reg));
- /* store result back */
- EMIT(PPC_RAW_STWCX(tmp2_reg, 0, tmp1_reg));
- /* we're done if this succeeded */
- PPC_BCC_SHORT(COND_NE, tmp_idx);
- break;
- case BPF_STX | BPF_ATOMIC | BPF_DW:
- if (imm != BPF_ADD) {
+ if (size == BPF_DW)
+ EMIT(PPC_RAW_LDARX(tmp2_reg, tmp1_reg, dst_reg, 0));
+ else
+ EMIT(PPC_RAW_LWARX(tmp2_reg, tmp1_reg, dst_reg, 0));
+
+ switch (imm) {
+ case BPF_ADD:
+ EMIT(PPC_RAW_ADD(tmp2_reg, tmp2_reg, src_reg));
+ break;
+ case BPF_AND:
+ EMIT(PPC_RAW_AND(tmp2_reg, tmp2_reg, src_reg));
+ break;
+ case BPF_OR:
+ EMIT(PPC_RAW_OR(tmp2_reg, tmp2_reg, src_reg));
+ break;
+ case BPF_XOR:
+ EMIT(PPC_RAW_XOR(tmp2_reg, tmp2_reg, src_reg));
+ break;
+ default:
pr_err_ratelimited(
"eBPF filter atomic op code %02x (@%d) unsupported\n",
code, i);
- return -ENOTSUPP;
+ return -EOPNOTSUPP;
}
- /* *(u64 *)(dst + off) += src */
- EMIT(PPC_RAW_ADDI(tmp1_reg, dst_reg, off));
- tmp_idx = ctx->idx * 4;
- EMIT(PPC_RAW_LDARX(tmp2_reg, 0, tmp1_reg, 0));
- EMIT(PPC_RAW_ADD(tmp2_reg, tmp2_reg, src_reg));
- EMIT(PPC_RAW_STDCX(tmp2_reg, 0, tmp1_reg));
+ /* store result back */
+ 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);
break;
--
2.35.3
next prev parent reply other threads:[~2022-06-10 15:57 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 ` Hari Bathini [this message]
2022-06-10 15:55 ` [PATCH v2 2/5] bpf ppc64: add support for atomic fetch operations Hari Bathini
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20220610155552.25892-2-hbathini@linux.ibm.com \
--to=hbathini@linux.ibm.com \
--cc=andrii@kernel.org \
--cc=ast@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=daniel@iogearbox.net \
--cc=jniethe5@gmail.com \
--cc=john.fastabend@gmail.com \
--cc=kafai@fb.com \
--cc=kpsingh@kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=naveen.n.rao@linux.ibm.com \
--cc=netdev@vger.kernel.org \
--cc=paulus@samba.org \
--cc=songliubraving@fb.com \
--cc=yhs@fb.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).