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Rao" To: Michael Ellerman Subject: [PATCH powerpc/next 02/17] powerpc/bpf: Emit a single branch instruction for known short branch ranges Date: Mon, 14 Feb 2022 16:11:36 +0530 Message-Id: X-Mailer: git-send-email 2.27.0 In-Reply-To: References: MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: oha8cpTjk6aMfEZ6829g7w6OgqljNmlC X-Proofpoint-ORIG-GUID: KKR5asIXZNWXgfPUxB9fbEaoa-QTBWDN X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2022-02-14_02,2022-02-14_03,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 impostorscore=0 suspectscore=0 priorityscore=1501 phishscore=0 clxscore=1015 mlxscore=0 lowpriorityscore=0 adultscore=0 spamscore=0 bulkscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2202140062 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: Daniel Borkmann , Yauheni Kaliuta , bpf@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Alexei Starovoitov , Hari Bathini Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" PPC_BCC() emits two instructions to accommodate scenarios where we need to branch outside the range of a conditional branch. PPC_BCC_SHORT() emits a single branch instruction and can be used when the branch is known to be within a conditional branch range. Convert some of the uses of PPC_BCC() in the powerpc BPF JIT over to PPC_BCC_SHORT() where we know the branch range. Signed-off-by: Naveen N. Rao --- arch/powerpc/net/bpf_jit_comp32.c | 8 ++++---- arch/powerpc/net/bpf_jit_comp64.c | 8 ++++---- 2 files changed, 8 insertions(+), 8 deletions(-) diff --git a/arch/powerpc/net/bpf_jit_comp32.c b/arch/powerpc/net/bpf_jit_comp32.c index cf8dd8aea386c4..81e0c56661ddf2 100644 --- a/arch/powerpc/net/bpf_jit_comp32.c +++ b/arch/powerpc/net/bpf_jit_comp32.c @@ -221,7 +221,7 @@ static int bpf_jit_emit_tail_call(u32 *image, struct codegen_context *ctx, u32 o EMIT(PPC_RAW_LWZ(_R0, b2p_bpf_array, offsetof(struct bpf_array, map.max_entries))); EMIT(PPC_RAW_CMPLW(b2p_index, _R0)); EMIT(PPC_RAW_LWZ(_R0, _R1, bpf_jit_stack_offsetof(ctx, BPF_PPC_TC))); - PPC_BCC(COND_GE, out); + PPC_BCC_SHORT(COND_GE, out); /* * if (tail_call_cnt >= MAX_TAIL_CALL_CNT) @@ -230,7 +230,7 @@ static int bpf_jit_emit_tail_call(u32 *image, struct codegen_context *ctx, u32 o EMIT(PPC_RAW_CMPLWI(_R0, MAX_TAIL_CALL_CNT)); /* tail_call_cnt++; */ EMIT(PPC_RAW_ADDIC(_R0, _R0, 1)); - PPC_BCC(COND_GE, out); + PPC_BCC_SHORT(COND_GE, out); /* prog = array->ptrs[index]; */ EMIT(PPC_RAW_RLWINM(_R3, b2p_index, 2, 0, 29)); @@ -243,7 +243,7 @@ static int bpf_jit_emit_tail_call(u32 *image, struct codegen_context *ctx, u32 o * goto out; */ EMIT(PPC_RAW_CMPLWI(_R3, 0)); - PPC_BCC(COND_EQ, out); + PPC_BCC_SHORT(COND_EQ, out); /* goto *(prog->bpf_func + prologue_size); */ EMIT(PPC_RAW_LWZ(_R3, _R3, offsetof(struct bpf_prog, bpf_func))); @@ -834,7 +834,7 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context * if (BPF_MODE(code) == BPF_PROBE_MEM) { PPC_LI32(_R0, TASK_SIZE - off); EMIT(PPC_RAW_CMPLW(src_reg, _R0)); - PPC_BCC(COND_GT, (ctx->idx + 5) * 4); + PPC_BCC_SHORT(COND_GT, (ctx->idx + 4) * 4); EMIT(PPC_RAW_LI(dst_reg, 0)); /* * For BPF_DW case, "li reg_h,0" would be needed when diff --git a/arch/powerpc/net/bpf_jit_comp64.c b/arch/powerpc/net/bpf_jit_comp64.c index e1e8c934308adb..b1ed8611091d2b 100644 --- a/arch/powerpc/net/bpf_jit_comp64.c +++ b/arch/powerpc/net/bpf_jit_comp64.c @@ -225,7 +225,7 @@ static int bpf_jit_emit_tail_call(u32 *image, struct codegen_context *ctx, u32 o EMIT(PPC_RAW_LWZ(b2p[TMP_REG_1], b2p_bpf_array, offsetof(struct bpf_array, map.max_entries))); EMIT(PPC_RAW_RLWINM(b2p_index, b2p_index, 0, 0, 31)); EMIT(PPC_RAW_CMPLW(b2p_index, b2p[TMP_REG_1])); - PPC_BCC(COND_GE, out); + PPC_BCC_SHORT(COND_GE, out); /* * if (tail_call_cnt >= MAX_TAIL_CALL_CNT) @@ -233,7 +233,7 @@ static int bpf_jit_emit_tail_call(u32 *image, struct codegen_context *ctx, u32 o */ PPC_BPF_LL(b2p[TMP_REG_1], 1, bpf_jit_stack_tailcallcnt(ctx)); EMIT(PPC_RAW_CMPLWI(b2p[TMP_REG_1], MAX_TAIL_CALL_CNT)); - PPC_BCC(COND_GE, out); + PPC_BCC_SHORT(COND_GE, out); /* * tail_call_cnt++; @@ -251,7 +251,7 @@ static int bpf_jit_emit_tail_call(u32 *image, struct codegen_context *ctx, u32 o * goto out; */ EMIT(PPC_RAW_CMPLDI(b2p[TMP_REG_1], 0)); - PPC_BCC(COND_EQ, out); + PPC_BCC_SHORT(COND_EQ, out); /* goto *(prog->bpf_func + prologue_size); */ PPC_BPF_LL(b2p[TMP_REG_1], b2p[TMP_REG_1], offsetof(struct bpf_prog, bpf_func)); @@ -807,7 +807,7 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context * else /* BOOK3S_64 */ PPC_LI64(b2p[TMP_REG_2], PAGE_OFFSET); EMIT(PPC_RAW_CMPLD(b2p[TMP_REG_1], b2p[TMP_REG_2])); - PPC_BCC(COND_GT, (ctx->idx + 4) * 4); + PPC_BCC_SHORT(COND_GT, (ctx->idx + 3) * 4); EMIT(PPC_RAW_LI(dst_reg, 0)); /* * Check if 'off' is word aligned because PPC_BPF_LL()