From patchwork Wed May 22 18:55:04 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiong Wang X-Patchwork-Id: 1103554 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=netronome.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=netronome-com.20150623.gappssmtp.com header.i=@netronome-com.20150623.gappssmtp.com header.b="fRatHsCV"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 458MKt3G99z9s7h for ; Thu, 23 May 2019 04:56:18 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729746AbfEVS4E (ORCPT ); Wed, 22 May 2019 14:56:04 -0400 Received: from mail-wr1-f66.google.com ([209.85.221.66]:44886 "EHLO mail-wr1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729685AbfEVSz7 (ORCPT ); Wed, 22 May 2019 14:55:59 -0400 Received: by mail-wr1-f66.google.com with SMTP id w13so3452111wru.11 for ; Wed, 22 May 2019 11:55:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=netronome-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=5YnD+NSqVK6fhGQF6L29e9Q4qjgxcPpyRRt0fRxS8v8=; b=fRatHsCV1bWK1/vFoN4Za2Ze2Mvfv3QFaGLhAAeZCHMbHrYAXJTNTiRkev1uWFdHj8 SGwcS7NqHAiG+Jq2Z2YQoEEI+eYcW2YSOxwSwViizQcdxzE6tAPdTp4t+GPwOIAduSbz o9JpivT0peMp+8VnDVVoGwEmobdFGYzcuQLmweQ0+3czA5S3fyCz51f5F4tbf01ZNFK9 LcSfSRBua4w4dvvfog1zHkpIV/GQ8AlaWU7bowrTjPm0XfiPnvG0tTwmUx02NIDmATYU HSW8zeX11OHV5321yXkKs6uDlkv48bHtaNj6Cm9ayElZZ9o+Lcg7OILV1SyL9sRv+Ide S8ew== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=5YnD+NSqVK6fhGQF6L29e9Q4qjgxcPpyRRt0fRxS8v8=; b=VKoDMt0Ay1SutXhY1N5IqM6kfSi/ZXQnhqlP2RuPLbbmUc56chd7Itqd9JvTCIR6K1 eotGYRT8CxxuH4gWFVN7UCasidBrKsplNrWpy56acUnYA4moswzxAsCE0lIjifCsyHsl hV/gugmvI3GidREFLcH+lpAcH1Xm9QNPiFNGeuqDg+MjRPDOo5nUck4VjSf7dQMk4gG8 JJgI37WRv04BE5YfHv/gBhduwGHnMEuEFozegvgob468PY09XYXXtfA00hgoCp91rcWI XH8FZl7onqX8yI4+zJwvMPovdj33VCzXscRFuzn2NS764ZQKfjqxo/t39IZfVx1B/kNa 3tIQ== X-Gm-Message-State: APjAAAWx1cmWZgkNLh1HU6iJPIsBxWIeWhKDd+Tc8qthU6Rdu1GpILQI dvn59ER0FurMp/aezcDnCQsDag== X-Google-Smtp-Source: APXvYqylTd0u7ZROyD7bM3mBC+OmzrHmpcACw3HvnHgvvTot+/DX/LvRjiLTBfmeP8lPJ1p5JgK8GQ== X-Received: by 2002:adf:dc8e:: with SMTP id r14mr40629519wrj.121.1558551357568; Wed, 22 May 2019 11:55:57 -0700 (PDT) Received: from cbtest28.netronome.com ([217.38.71.146]) by smtp.gmail.com with ESMTPSA id t12sm16328801wro.2.2019.05.22.11.55.56 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 22 May 2019 11:55:56 -0700 (PDT) From: Jiong Wang To: alexei.starovoitov@gmail.com, daniel@iogearbox.net Cc: bpf@vger.kernel.org, netdev@vger.kernel.org, oss-drivers@netronome.com, davem@davemloft.net, paul.burton@mips.com, udknight@gmail.com, zlim.lnx@gmail.com, illusionist.neo@gmail.com, naveen.n.rao@linux.ibm.com, sandipan@linux.ibm.com, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, jakub.kicinski@netronome.com, Jiong Wang Subject: [PATCH v7 bpf-next 08/16] selftests: bpf: adjust several test_verifier helpers for insn insertion Date: Wed, 22 May 2019 19:55:04 +0100 Message-Id: <1558551312-17081-9-git-send-email-jiong.wang@netronome.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1558551312-17081-1-git-send-email-jiong.wang@netronome.com> References: <1558551312-17081-1-git-send-email-jiong.wang@netronome.com> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org - bpf_fill_ld_abs_vlan_push_pop: Prevent zext happens inside PUSH_CNT loop. This could happen because of BPF_LD_ABS (32-bit def) + BPF_JMP (64-bit use), or BPF_LD_ABS + EXIT (64-bit use of R0). So, change BPF_JMP to BPF_JMP32 and redefine R0 at exit path to cut off the data-flow from inside the loop. - bpf_fill_jump_around_ld_abs: Jump range is limited to 16 bit. every ld_abs is replaced by 6 insns, but on arches like arm, ppc etc, there will be one BPF_ZEXT inserted to extend the error value of the inlined ld_abs sequence which then contains 7 insns. so, set the dividend to 7 so the testcase could work on all arches. - bpf_fill_scale1/bpf_fill_scale2: Both contains ~1M BPF_ALU32_IMM which will trigger ~1M insn patcher call because of hi32 randomization later when BPF_F_TEST_RND_HI32 is set for bpf selftests. Insn patcher is not efficient that 1M call to it will hang computer. So , change to BPF_ALU64_IMM to avoid hi32 randomization. Signed-off-by: Jiong Wang --- tools/testing/selftests/bpf/test_verifier.c | 29 +++++++++++++++++++---------- 1 file changed, 19 insertions(+), 10 deletions(-) diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c index ccd896b..3dcdfd4 100644 --- a/tools/testing/selftests/bpf/test_verifier.c +++ b/tools/testing/selftests/bpf/test_verifier.c @@ -138,32 +138,36 @@ static void bpf_fill_ld_abs_vlan_push_pop(struct bpf_test *self) loop: for (j = 0; j < PUSH_CNT; j++) { insn[i++] = BPF_LD_ABS(BPF_B, 0); - insn[i] = BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0x34, len - i - 2); + /* jump to error label */ + insn[i] = BPF_JMP32_IMM(BPF_JNE, BPF_REG_0, 0x34, len - i - 3); i++; insn[i++] = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6); insn[i++] = BPF_MOV64_IMM(BPF_REG_2, 1); insn[i++] = BPF_MOV64_IMM(BPF_REG_3, 2); insn[i++] = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_skb_vlan_push), - insn[i] = BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, len - i - 2); + insn[i] = BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, len - i - 3); i++; } for (j = 0; j < PUSH_CNT; j++) { insn[i++] = BPF_LD_ABS(BPF_B, 0); - insn[i] = BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0x34, len - i - 2); + insn[i] = BPF_JMP32_IMM(BPF_JNE, BPF_REG_0, 0x34, len - i - 3); i++; insn[i++] = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6); insn[i++] = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_skb_vlan_pop), - insn[i] = BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, len - i - 2); + insn[i] = BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, len - i - 3); i++; } if (++k < 5) goto loop; - for (; i < len - 1; i++) - insn[i] = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, 0xbef); + for (; i < len - 3; i++) + insn[i] = BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 0xbef); + insn[len - 3] = BPF_JMP_A(1); + /* error label */ + insn[len - 2] = BPF_MOV32_IMM(BPF_REG_0, 0); insn[len - 1] = BPF_EXIT_INSN(); self->prog_len = len; } @@ -171,8 +175,13 @@ static void bpf_fill_ld_abs_vlan_push_pop(struct bpf_test *self) static void bpf_fill_jump_around_ld_abs(struct bpf_test *self) { struct bpf_insn *insn = self->fill_insns; - /* jump range is limited to 16 bit. every ld_abs is replaced by 6 insns */ - unsigned int len = (1 << 15) / 6; + /* jump range is limited to 16 bit. every ld_abs is replaced by 6 insns, + * but on arches like arm, ppc etc, there will be one BPF_ZEXT inserted + * to extend the error value of the inlined ld_abs sequence which then + * contains 7 insns. so, set the dividend to 7 so the testcase could + * work on all arches. + */ + unsigned int len = (1 << 15) / 7; int i = 0; insn[i++] = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1); @@ -230,7 +239,7 @@ static void bpf_fill_scale1(struct bpf_test *self) * within 1m limit add MAX_TEST_INSNS - 1025 MOVs and 1 EXIT */ while (i < MAX_TEST_INSNS - 1025) - insn[i++] = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, 42); + insn[i++] = BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 42); insn[i] = BPF_EXIT_INSN(); self->prog_len = i + 1; self->retval = 42; @@ -261,7 +270,7 @@ static void bpf_fill_scale2(struct bpf_test *self) * within 1m limit add MAX_TEST_INSNS - 1025 MOVs and 1 EXIT */ while (i < MAX_TEST_INSNS - 1025) - insn[i++] = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, 42); + insn[i++] = BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 42); insn[i] = BPF_EXIT_INSN(); self->prog_len = i + 1; self->retval = 42;