From mboxrd@z Thu Jan 1 00:00:00 1970 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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,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 B2B28C4360F for ; Wed, 13 Mar 2019 19:21:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 83E5C2075C for ; Wed, 13 Mar 2019 19:21:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1552504915; bh=uBf6WCT8Qyp8OuImBV093cQtIIH1L1rnpU82AcuQQrg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=1URmUSL5asXV2tobo8J0lWHXP7Ls/i1I7oThFpmlz4unXA7XIpJSZCVuA+/AuMGxw X7xD5hEY8ofhhQWA17DAMuTNd8XiaeM8PvnfHC9JJuVomoucgj1GZTNVlaXrn/JcFR FYDt8ZcVs8xG25iGdF4ZCYrNX//VBANHQJy39m1c= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728979AbfCMTR4 (ORCPT ); Wed, 13 Mar 2019 15:17:56 -0400 Received: from mail.kernel.org ([198.145.29.99]:48426 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728955AbfCMTR4 (ORCPT ); Wed, 13 Mar 2019 15:17:56 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 59E952075C; Wed, 13 Mar 2019 19:17:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1552504675; bh=uBf6WCT8Qyp8OuImBV093cQtIIH1L1rnpU82AcuQQrg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IRd2BbAzXD4dYwdsB3QvnfGF5YaqjjBCm5AceF6KC5MQSUJX9/wAooR3EjzcE5WNd MPA6CTGPpkVDmQOxSEVps8+lCRvDXkFDfwkGXxgf4Yuq0Ogo1xZ6gLx3Fs7P2SkGhz H9gEB3FbvT/wf8MqrAeSqS8/ONY8rp3I+VLAVdV0= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Jiong Wang , Daniel Borkmann , Sasha Levin , oss-drivers@netronome.com, netdev@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 22/24] nfp: bpf: fix ALU32 high bits clearance bug Date: Wed, 13 Mar 2019 15:16:45 -0400 Message-Id: <20190313191647.160171-22-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190313191647.160171-1-sashal@kernel.org> References: <20190313191647.160171-1-sashal@kernel.org> MIME-Version: 1.0 X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Jiong Wang [ Upstream commit f036ebd9bfbe1e91a3d855e85e05fc5ff156b641 ] NFP BPF JIT compiler is doing a couple of small optimizations when jitting ALU imm instructions, some of these optimizations could save code-gen, for example: A & -1 = A A | 0 = A A ^ 0 = A However, for ALU32, high 32-bit of the 64-bit register should still be cleared according to ISA semantics. Fixes: cd7df56ed3e6 ("nfp: add BPF to NFP code translator") Reviewed-by: Jakub Kicinski Signed-off-by: Jiong Wang Signed-off-by: Daniel Borkmann Signed-off-by: Sasha Levin --- .../net/ethernet/netronome/nfp/nfp_bpf_jit.c | 17 ++++++----------- 1 file changed, 6 insertions(+), 11 deletions(-) diff --git a/drivers/net/ethernet/netronome/nfp/nfp_bpf_jit.c b/drivers/net/ethernet/netronome/nfp/nfp_bpf_jit.c index 6bfcd6eb74ca..73087770d72f 100644 --- a/drivers/net/ethernet/netronome/nfp/nfp_bpf_jit.c +++ b/drivers/net/ethernet/netronome/nfp/nfp_bpf_jit.c @@ -756,15 +756,10 @@ wrp_alu64_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, static int wrp_alu32_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta, - enum alu_op alu_op, bool skip) + enum alu_op alu_op) { const struct bpf_insn *insn = &meta->insn; - if (skip) { - meta->skip = true; - return 0; - } - wrp_alu_imm(nfp_prog, insn->dst_reg * 2, alu_op, insn->imm); wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0); @@ -1017,7 +1012,7 @@ static int xor_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) static int xor_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) { - return wrp_alu32_imm(nfp_prog, meta, ALU_OP_XOR, !meta->insn.imm); + return wrp_alu32_imm(nfp_prog, meta, ALU_OP_XOR); } static int and_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) @@ -1027,7 +1022,7 @@ static int and_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) static int and_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) { - return wrp_alu32_imm(nfp_prog, meta, ALU_OP_AND, !~meta->insn.imm); + return wrp_alu32_imm(nfp_prog, meta, ALU_OP_AND); } static int or_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) @@ -1037,7 +1032,7 @@ static int or_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) static int or_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) { - return wrp_alu32_imm(nfp_prog, meta, ALU_OP_OR, !meta->insn.imm); + return wrp_alu32_imm(nfp_prog, meta, ALU_OP_OR); } static int add_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) @@ -1047,7 +1042,7 @@ static int add_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) static int add_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) { - return wrp_alu32_imm(nfp_prog, meta, ALU_OP_ADD, !meta->insn.imm); + return wrp_alu32_imm(nfp_prog, meta, ALU_OP_ADD); } static int sub_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) @@ -1057,7 +1052,7 @@ static int sub_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) static int sub_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) { - return wrp_alu32_imm(nfp_prog, meta, ALU_OP_SUB, !meta->insn.imm); + return wrp_alu32_imm(nfp_prog, meta, ALU_OP_SUB); } static int shl_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) -- 2.19.1