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Tue, 11 Mar 2025 16:10:10 GMT Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id AF02E2004B; Tue, 11 Mar 2025 16:10:10 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 26ED220040; Tue, 11 Mar 2025 16:10:05 +0000 (GMT) Received: from li-621bac4c-27c7-11b2-a85c-c2bf7c4b3c07.ibm.com.com (unknown [9.43.96.240]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 11 Mar 2025 16:10:04 +0000 (GMT) From: Saket Kumar Bhaskar To: bpf@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Cc: ast@kernel.org, hbathini@linux.ibm.com, andrii@kernel.org, daniel@iogearbox.net, martin.lau@linux.dev, eddyz87@gmail.com, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, christophe.leroy@csgroup.eu, naveen@kernel.org, maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com Subject: [PATCH 1/2] powerpc, bpf: Support internal-only MOV instruction to resolve per-CPU addrs Date: Tue, 11 Mar 2025 21:39:54 +0530 Message-ID: <20250311160955.825647-2-skb99@linux.ibm.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20250311160955.825647-1-skb99@linux.ibm.com> References: <20250311160955.825647-1-skb99@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: SbObSsazE-_vAdH6ansVpz51laznm6K_ X-Proofpoint-GUID: M20SgSxcpPeqKXZm4nH5Mg0jztoWNQLj X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1093,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-03-11_04,2025-03-11_02,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 mlxlogscore=999 spamscore=0 lowpriorityscore=0 clxscore=1011 malwarescore=0 suspectscore=0 adultscore=0 phishscore=0 impostorscore=0 priorityscore=1501 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2502100000 definitions=main-2503110101 With the introduction of commit 7bdbf7446305 ("bpf: add special internal-only MOV instruction to resolve per-CPU addrs"), a new BPF instruction BPF_MOV64_PERCPU_REG has been added to resolve absolute addresses of per-CPU data from their per-CPU offsets. This update requires enabling support for this instruction in the powerpc JIT compiler. As of commit 7a0268fa1a36 ("[PATCH] powerpc/64: per cpu data optimisations"), the per-CPU data offset for the CPU is stored in the paca. To support this BPF instruction in the powerpc JIT, the following powerpc instructions are emitted: mr dst_reg, src_reg //Move src_reg to dst_reg, if src_reg !=3D dst_reg ld tmp1_reg, 48(13) //Load per-CPU data offset from paca(r13) in tmp1_reg. add dst_reg, dst_reg, tmp1_reg //Add the per cpu offset to the dst. To evaluate the performance improvements introduced by this change, the benchmark described in [1] was employed. Before Change: glob-arr-inc : 41.580 =C2=B1 0.034M/s arr-inc : 39.592 =C2=B1 0.055M/s hash-inc : 25.873 =C2=B1 0.012M/s After Change: glob-arr-inc : 42.024 =C2=B1 0.049M/s arr-inc : 55.447 =C2=B1 0.031M/s hash-inc : 26.565 =C2=B1 0.014M/s [1] https://github.com/anakryiko/linux/commit/8dec900975ef Signed-off-by: Saket Kumar Bhaskar --- arch/powerpc/net/bpf_jit_comp.c | 5 +++++ arch/powerpc/net/bpf_jit_comp64.c | 8 ++++++++ 2 files changed, 13 insertions(+) diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_com= p.c index 2991bb171a9b..3d4bd45a9a22 100644 --- a/arch/powerpc/net/bpf_jit_comp.c +++ b/arch/powerpc/net/bpf_jit_comp.c @@ -440,6 +440,11 @@ bool bpf_jit_supports_far_kfunc_call(void) return IS_ENABLED(CONFIG_PPC64); } =20 +bool bpf_jit_supports_percpu_insn(void) +{ + return true; +} + void *arch_alloc_bpf_trampoline(unsigned int size) { return bpf_prog_pack_alloc(size, bpf_jit_fill_ill_insns); diff --git a/arch/powerpc/net/bpf_jit_comp64.c b/arch/powerpc/net/bpf_jit_c= omp64.c index 233703b06d7c..06f06770ceea 100644 --- a/arch/powerpc/net/bpf_jit_comp64.c +++ b/arch/powerpc/net/bpf_jit_comp64.c @@ -679,6 +679,14 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image= , u32 *fimage, struct code */ case BPF_ALU | BPF_MOV | BPF_X: /* (u32) dst =3D src */ case BPF_ALU64 | BPF_MOV | BPF_X: /* dst =3D src */ + if (insn_is_mov_percpu_addr(&insn[i])) { + if (dst_reg !=3D src_reg) + EMIT(PPC_RAW_MR(dst_reg, src_reg)); 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Tue, 11 Mar 2025 16:10:10 +0000 (GMT) From: Saket Kumar Bhaskar To: bpf@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Cc: ast@kernel.org, hbathini@linux.ibm.com, andrii@kernel.org, daniel@iogearbox.net, martin.lau@linux.dev, eddyz87@gmail.com, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, christophe.leroy@csgroup.eu, naveen@kernel.org, maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com Subject: [PATCH 2/2] powerpc, bpf: Inline bpf_get_smp_processor_id() Date: Tue, 11 Mar 2025 21:39:55 +0530 Message-ID: <20250311160955.825647-3-skb99@linux.ibm.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20250311160955.825647-1-skb99@linux.ibm.com> References: <20250311160955.825647-1-skb99@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: 0Q1rkXzBFu15-t_NNyNIKB5YUHYg0Zcc X-Proofpoint-GUID: H6X_cuOGAr15dDWrqW6bOtNhwwY76Q1E X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1093,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-03-11_04,2025-03-11_02,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 phishscore=0 lowpriorityscore=0 mlxlogscore=700 malwarescore=0 clxscore=1011 mlxscore=0 impostorscore=0 bulkscore=0 spamscore=0 suspectscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2502100000 definitions=main-2503110101 Inline the calls to bpf_get_smp_processor_id() in the powerpc bpf jit. powerpc saves the Logical processor number (paca_index) in paca. Here is how the powerpc JITed assembly changes after this commit: Before: cpu =3D bpf_get_smp_processor_id(); addis 12, 2, -517 addi 12, 12, -29456 mtctr 12 bctrl mr 8, 3 After: cpu =3D bpf_get_smp_processor_id(); lhz 8, 8(13) To evaluate the performance improvements introduced by this change, the benchmark described in [1] was employed. +---------------+-------------------+-------------------+--------------+ | Name | Before | After | % change | |---------------+-------------------+-------------------+--------------| | glob-arr-inc | 41.580 =C2=B1 0.034M/s | 54.137 =C2=B1 0.019M/s | + 30.= 20% | | arr-inc | 39.592 =C2=B1 0.055M/s | 54.000 =C2=B1 0.026M/s | + 36.= 39% | | hash-inc | 25.873 =C2=B1 0.012M/s | 26.334 =C2=B1 0.058M/s | + 1.7= 8% | +---------------+-------------------+-------------------+--------------+ [1] https://github.com/anakryiko/linux/commit/8dec900975ef Signed-off-by: Saket Kumar Bhaskar --- arch/powerpc/net/bpf_jit_comp.c | 10 ++++++++++ arch/powerpc/net/bpf_jit_comp64.c | 5 +++++ 2 files changed, 15 insertions(+) diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_com= p.c index 3d4bd45a9a22..4b79b2d95469 100644 --- a/arch/powerpc/net/bpf_jit_comp.c +++ b/arch/powerpc/net/bpf_jit_comp.c @@ -445,6 +445,16 @@ bool bpf_jit_supports_percpu_insn(void) return true; } =20 +bool bpf_jit_inlines_helper_call(s32 imm) +{ + switch (imm) { + case BPF_FUNC_get_smp_processor_id: + return true; + default: + return false; + } +} + void *arch_alloc_bpf_trampoline(unsigned int size) { return bpf_prog_pack_alloc(size, bpf_jit_fill_ill_insns); diff --git a/arch/powerpc/net/bpf_jit_comp64.c b/arch/powerpc/net/bpf_jit_c= omp64.c index 06f06770ceea..a8de12c026da 100644 --- a/arch/powerpc/net/bpf_jit_comp64.c +++ b/arch/powerpc/net/bpf_jit_comp64.c @@ -1087,6 +1087,11 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *ima= ge, u32 *fimage, struct code case BPF_JMP | BPF_CALL: ctx->seen |=3D SEEN_FUNC; =20 + if (insn[i].src_reg =3D=3D 0 && imm =3D=3D BPF_FUNC_get_smp_processor_i= d) { + EMIT(PPC_RAW_LHZ(bpf_to_ppc(BPF_REG_0), _R13, offsetof(struct paca_str= uct, paca_index))); + break; + } + ret =3D bpf_jit_get_func_addr(fp, &insn[i], extra_pass, &func_addr, &func_addr_fixed); if (ret < 0) --=20 2.43.5