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Fri, 10 Jun 2022 15:56:05 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 772214C040; Fri, 10 Jun 2022 15:56:01 +0000 (GMT) Received: from hbathini-workstation.in.ibm.com (unknown [9.203.106.231]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 10 Jun 2022 15:56:01 +0000 (GMT) From: Hari Bathini To: bpf@vger.kernel.org, linuxppc-dev Subject: [PATCH v2 2/5] bpf ppc64: add support for atomic fetch operations Date: Fri, 10 Jun 2022 21:25:49 +0530 Message-Id: <20220610155552.25892-3-hbathini@linux.ibm.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20220610155552.25892-1-hbathini@linux.ibm.com> References: <20220610155552.25892-1-hbathini@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: QulAns6e6jerUzYVw0jpQIGkD46kBAgl X-Proofpoint-ORIG-GUID: l8hK_OLVrbR0Pcu_MpkUN8m6bUpaUcsH X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.874,Hydra:6.0.517,FMLib:17.11.64.514 definitions=2022-06-10_06,2022-06-09_02,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 suspectscore=0 clxscore=1015 impostorscore=0 malwarescore=0 bulkscore=0 phishscore=0 mlxscore=0 mlxlogscore=999 lowpriorityscore=0 priorityscore=1501 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2204290000 definitions=main-2206100061 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Song Liu , Daniel Borkmann , John Fastabend , Alexei Starovoitov , Andrii Nakryiko , netdev@vger.kernel.org, Paul Mackerras , "Naveen N. Rao" , Yonghong Song , KP Singh , Jordan Niethe , Martin KaFai Lau Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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 --- * 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; /*