From patchwork Wed Mar 17 12:51:47 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jianlin Lv X-Patchwork-Id: 12145705 X-Patchwork-Delegate: bpf@iogearbox.net 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 D7BC7C433E9 for ; Wed, 17 Mar 2021 12:52:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7AE5464F18 for ; Wed, 17 Mar 2021 12:52:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230002AbhCQMwP (ORCPT ); Wed, 17 Mar 2021 08:52:15 -0400 Received: from foss.arm.com ([217.140.110.172]:59700 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229867AbhCQMwA (ORCPT ); Wed, 17 Mar 2021 08:52:00 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 26F6931B; Wed, 17 Mar 2021 05:51:59 -0700 (PDT) Received: from net-arm-thunderx2-02.shanghai.arm.com (net-arm-thunderx2-02.shanghai.arm.com [10.169.208.215]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id ED3783F792; Wed, 17 Mar 2021 05:51:53 -0700 (PDT) From: Jianlin Lv To: bpf@vger.kernel.org Cc: kuba@kernel.org, simon.horman@netronome.com, davem@davemloft.net, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, kafai@fb.com, songliubraving@fb.com, yhs@fb.com, john.fastabend@gmail.com, kpsingh@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, oss-drivers@netronome.com, linux-api@vger.kernel.org, Jianlin.Lv@arm.com, iecedge@gmail.com Subject: [PATCH bpf-next] bpf: Simplify expression for identify bpf mem type Date: Wed, 17 Mar 2021 20:51:47 +0800 Message-Id: <20210317125147.2159512-1-Jianlin.Lv@arm.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Added BPF_SIZE_MASK macro as mask of size modifier that help to reduce the evaluation of expressions in if statements, and remove BPF_SIZE_MASK in netronome driver. Signed-off-by: Jianlin Lv --- drivers/net/ethernet/netronome/nfp/bpf/main.h | 2 -- include/uapi/linux/bpf.h | 1 + kernel/bpf/verifier.c | 12 ++++-------- 3 files changed, 5 insertions(+), 10 deletions(-) diff --git a/drivers/net/ethernet/netronome/nfp/bpf/main.h b/drivers/net/ethernet/netronome/nfp/bpf/main.h index d0e17eebddd9..8b1c2509ce46 100644 --- a/drivers/net/ethernet/netronome/nfp/bpf/main.h +++ b/drivers/net/ethernet/netronome/nfp/bpf/main.h @@ -346,8 +346,6 @@ struct nfp_insn_meta { struct list_head l; }; -#define BPF_SIZE_MASK 0x18 - static inline u8 mbpf_class(const struct nfp_insn_meta *meta) { return BPF_CLASS(meta->insn.code); diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 2d3036e292a9..5d77675e7112 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -21,6 +21,7 @@ #define BPF_DW 0x18 /* double word (64-bit) */ #define BPF_ATOMIC 0xc0 /* atomic memory ops - op type in immediate */ #define BPF_XADD 0xc0 /* exclusive add - legacy name */ +#define BPF_SIZE_MASK 0x18 /* mask of size modifier */ /* alu/jmp fields */ #define BPF_MOV 0xb0 /* mov reg to reg */ diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index f9096b049cd6..9755bb4d7de4 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -11384,15 +11384,11 @@ static int convert_ctx_accesses(struct bpf_verifier_env *env) for (i = 0; i < insn_cnt; i++, insn++) { bpf_convert_ctx_access_t convert_ctx_access; - if (insn->code == (BPF_LDX | BPF_MEM | BPF_B) || - insn->code == (BPF_LDX | BPF_MEM | BPF_H) || - insn->code == (BPF_LDX | BPF_MEM | BPF_W) || - insn->code == (BPF_LDX | BPF_MEM | BPF_DW)) + /* opcode: BPF_MEM | | BPF_LDX */ + if ((insn->code & ~BPF_SIZE_MASK) == (BPF_LDX | BPF_MEM)) type = BPF_READ; - else if (insn->code == (BPF_STX | BPF_MEM | BPF_B) || - insn->code == (BPF_STX | BPF_MEM | BPF_H) || - insn->code == (BPF_STX | BPF_MEM | BPF_W) || - insn->code == (BPF_STX | BPF_MEM | BPF_DW)) + /* opcode: BPF_MEM | | BPF_STX */ + else if ((insn->code & ~BPF_SIZE_MASK) == (BPF_STX | BPF_MEM)) type = BPF_WRITE; else continue;