From patchwork Mon Mar 22 16:37:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christophe Leroy X-Patchwork-Id: 12155541 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7B22DC433DB for ; Mon, 22 Mar 2021 16:38:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3649061992 for ; Mon, 22 Mar 2021 16:38:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229472AbhCVQh7 (ORCPT ); Mon, 22 Mar 2021 12:37:59 -0400 Received: from pegase1.c-s.fr ([93.17.236.30]:11802 "EHLO pegase1.c-s.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230306AbhCVQhs (ORCPT ); Mon, 22 Mar 2021 12:37:48 -0400 Received: from localhost (mailhub1-int [192.168.12.234]) by localhost (Postfix) with ESMTP id 4F40Xh2qlVz9txkM; Mon, 22 Mar 2021 17:37:40 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [192.168.12.234]) (amavisd-new, port 10024) with ESMTP id 0xxz-9rq0dT4; Mon, 22 Mar 2021 17:37:40 +0100 (CET) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase1.c-s.fr (Postfix) with ESMTP id 4F40Xh1qmSz9txkL; Mon, 22 Mar 2021 17:37:40 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id E57D08B7A3; Mon, 22 Mar 2021 17:37:45 +0100 (CET) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id hGhPYlNpQroi; Mon, 22 Mar 2021 17:37:45 +0100 (CET) Received: from po16121vm.idsi0.si.c-s.fr (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 9F83C8B79C; Mon, 22 Mar 2021 17:37:45 +0100 (CET) Received: by po16121vm.idsi0.si.c-s.fr (Postfix, from userid 0) id 730F3675F4; Mon, 22 Mar 2021 16:37:45 +0000 (UTC) Message-Id: From: Christophe Leroy Subject: [PATCH v2 0/8] Implement EBPF on powerpc32 To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, kafai@fb.com, songliubraving@fb.com, yhs@fb.com, john.fastabend@gmail.com, kpsingh@chromium.org, naveen.n.rao@linux.ibm.com, sandipan@linux.ibm.com Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, netdev@vger.kernel.org, bpf@vger.kernel.org Date: Mon, 22 Mar 2021 16:37:45 +0000 (UTC) Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org This series implements extended BPF on powerpc32. For the implementation details, see the patch before the last. The following operations are not implemented: case BPF_ALU64 | BPF_DIV | BPF_X: /* dst /= src */ case BPF_ALU64 | BPF_MOD | BPF_X: /* dst %= src */ case BPF_STX | BPF_XADD | BPF_DW: /* *(u64 *)(dst + off) += src */ The following operations are only implemented for power of two constants: case BPF_ALU64 | BPF_MOD | BPF_K: /* dst %= imm */ case BPF_ALU64 | BPF_DIV | BPF_K: /* dst /= imm */ Below are the results on a powerpc 885: - with the patch, with and without bpf_jit_enable - without the patch, with bpf_jit_enable (ie with CBPF) With the patch, with bpf_jit_enable = 1 : [ 60.826529] test_bpf: Summary: 378 PASSED, 0 FAILED, [354/366 JIT'ed] [ 60.832505] test_bpf: test_skb_segment: Summary: 2 PASSED, 0 FAILED With the patch, with bpf_jit_enable = 0 : [ 75.186337] test_bpf: Summary: 378 PASSED, 0 FAILED, [0/366 JIT'ed] [ 75.192325] test_bpf: test_skb_segment: Summary: 2 PASSED, 0 FAILED Without the patch, with bpf_jit_enable = 1 : [ 186.112429] test_bpf: Summary: 371 PASSED, 7 FAILED, [119/366 JIT'ed] Couldn't run test_progs because it doesn't build (clang 11 crashes during the build). Changes in v2: - Simplify 16 bits swap - Rework tailcall, use stack for tailcall counter - Fix handling of BPF_REG_FP: - must be handler like any other register allthough only the lower 32 bits part is used as a pointer. - r18 was TMP_REG, r17/r18 become de BPF_REG_FP - r31 was BPF_REG_FP, it is now TMP_REG - removed bpf_jit32.h - Reorder register allocation dynamically to use the volatile registers as much as possible when not doing function calls (last patch - new) Christophe Leroy (8): powerpc/bpf: Remove classical BPF support for PPC32 powerpc/bpf: Change register numbering for bpf_set/is_seen_register() powerpc/bpf: Move common helpers into bpf_jit.h powerpc/bpf: Move common functions into bpf_jit_comp.c powerpc/bpf: Change values of SEEN_ flags powerpc/asm: Add some opcodes in asm/ppc-opcode.h for PPC32 eBPF powerpc/bpf: Implement extended BPF on PPC32 powerpc/bpf: Reallocate BPF registers to volatile registers when possible on PPC32 Documentation/admin-guide/sysctl/net.rst | 2 +- arch/powerpc/Kconfig | 3 +- arch/powerpc/include/asm/ppc-opcode.h | 12 + arch/powerpc/net/Makefile | 6 +- arch/powerpc/net/bpf_jit.h | 61 ++ arch/powerpc/net/bpf_jit32.h | 139 --- arch/powerpc/net/bpf_jit64.h | 21 +- arch/powerpc/net/bpf_jit_asm.S | 226 ----- arch/powerpc/net/bpf_jit_comp.c | 782 ++++----------- arch/powerpc/net/bpf_jit_comp32.c | 1095 ++++++++++++++++++++++ arch/powerpc/net/bpf_jit_comp64.c | 295 +----- 11 files changed, 1372 insertions(+), 1270 deletions(-) delete mode 100644 arch/powerpc/net/bpf_jit32.h delete mode 100644 arch/powerpc/net/bpf_jit_asm.S create mode 100644 arch/powerpc/net/bpf_jit_comp32.c