From patchwork Wed Oct 4 20:43:34 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ian Rogers X-Patchwork-Id: 13409450 X-Patchwork-Delegate: bpf@iogearbox.net Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3524F22F0B for ; Wed, 4 Oct 2023 20:43:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="xoJ/4GCC" Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5BF17DD for ; Wed, 4 Oct 2023 13:43:57 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id 3f1490d57ef6-d7ec535fe42so400847276.1 for ; Wed, 04 Oct 2023 13:43:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1696452236; x=1697057036; darn=vger.kernel.org; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=62TaHeKznYGJNCCBRaj8AgsGHCErkYyX8npqYRMhtgg=; b=xoJ/4GCCvARflY83Xzl/+LuHonxdBfiLWf8Cf5mFmzqP1HYL2wBDu/L84XIvxm0n+z NWYTYk0L1qh/XQ0/2H3rDiw1Yd6cjgogPUS24mQJyCIsosU1Ob846qmhfJUOdrCCfc9k 1M+Ss139+t/sfmDKi5atuHFpBzQTHoj+ZmZWjdfnXVMr1nkmDeK2fga7D3aaSum4wHAs ZTpYk/0k9vvkOolwmtV2wj444G4bojJwVR/zhBMNaBNPGrX89xo1TMBRBgbmD+ylXQcJ i5ZRtCHQAkJGwf7lv7WAjidWW65CvlkRuHs1ek1Aa/MWVc4fuOgKoz/lHIuA4sVhwyUd pPnA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1696452236; x=1697057036; h=cc:to:from:subject:references:mime-version:message-id:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=62TaHeKznYGJNCCBRaj8AgsGHCErkYyX8npqYRMhtgg=; b=Dmu8VTsPikp4957OqVmo3BCkDd5IB9OChR3sPvDo5g5FnrrQz4bgX0YR2Zv43bh6gI n44B7sGo/JwRbh2Fk4iTEdxnzg0Vbfvbk60XrD9Zpp+s+YwP7OOOuc7L18xd7IAjwoel 38U/0G7xPfAi+6QFIoJNqoU23zJHZHP+iFig6PURkbWniUFhm+C+6BZZoCde2TdppnRb xKS+3Ds+POmsuRcBJ8MDA6GLe4EreoyAQeQ2ttDN2T91mxNWp17nvC99THg0AqysEnu8 0xzlJsL1bI8Qji/uUF1XXaxukGgcdmP+RDbjH/kEn5LfcztZmlb14NZjHnX1gBrkxW1f r+7g== X-Gm-Message-State: AOJu0YxJD6cb2Bb8s019pDJhmqRCofGLBqND0qFZWkm6Vo9kEZXbRDxS fhCmAu1RG72vjafzD4VHz5SsSZqJ8RMp X-Google-Smtp-Source: AGHT+IHnS2q4BQaNebBUwC8Wa6GFTLy93u8/Au3kJwkZeXtUpMl/qENTslwujnEYg/SeROm1frLjDzvPM40A X-Received: from irogers.svl.corp.google.com ([2620:15c:2a3:200:f42:a09e:8ee2:1491]) (user=irogers job=sendgmr) by 2002:a25:b18f:0:b0:d86:55b7:97b0 with SMTP id h15-20020a25b18f000000b00d8655b797b0mr53834ybj.9.1696452236615; Wed, 04 Oct 2023 13:43:56 -0700 (PDT) Date: Wed, 4 Oct 2023 13:43:34 -0700 In-Reply-To: <20231004204334.3465116-1-irogers@google.com> Message-Id: <20231004204334.3465116-2-irogers@google.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20231004204334.3465116-1-irogers@google.com> X-Mailer: git-send-email 2.42.0.609.gbb76f46606-goog Subject: [PATCH v3 2/2] bpftool: Align bpf_load_and_run_opts insns and data From: Ian Rogers To: Quentin Monnet , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , bpf@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Ian Rogers X-Spam-Status: No, score=-9.6 required=5.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_IN_DEF_DKIM_WL autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: bpf@iogearbox.net A C string lacks alignment so use aligned arrays to avoid potential alignment problems. Switch to using sizeof (less 1 for the \0 terminator) rather than a hardcode size constant. Signed-off-by: Ian Rogers --- tools/bpf/bpftool/gen.c | 47 ++++++++++++++++++++++------------------- 1 file changed, 25 insertions(+), 22 deletions(-) diff --git a/tools/bpf/bpftool/gen.c b/tools/bpf/bpftool/gen.c index b8ebcee9bc56..8c36c96cd692 100644 --- a/tools/bpf/bpftool/gen.c +++ b/tools/bpf/bpftool/gen.c @@ -408,8 +408,8 @@ static void codegen(const char *template, ...) /* skip baseline indentation tabs */ for (n = skip_tabs; n > 0; n--, src++) { if (*src != '\t') { - p_err("not enough tabs at pos %td in template '%s'", - src - template - 1, template); + p_err("not enough tabs at pos %td in template '%s'\n'%s'", + src - template - 1, template, src); free(s); exit(-1); } @@ -708,17 +708,22 @@ static int gen_trace(struct bpf_object *obj, const char *obj_name, const char *h codegen("\ \n\ - skel->%1$s = skel_prep_map_data((void *)\"\\ \n\ - ", ident); + { \n\ + static const char data[] __attribute__((aligned__(8))) = \"\\\n\ + "); mmap_data = bpf_map__initial_value(map, &mmap_size); print_hex(mmap_data, mmap_size); codegen("\ \n\ - \", %1$zd, %2$zd); \n\ - if (!skel->%3$s) \n\ - goto cleanup; \n\ - skel->maps.%3$s.initial_value = (__u64) (long) skel->%3$s;\n\ - ", bpf_map_mmap_sz(map), mmap_size, ident); + \"; \n\ + \n\ + skel->%1$s = skel_prep_map_data((void *)data, %2$zd,\n\ + sizeof(data) - 1);\n\ + if (!skel->%1$s) \n\ + goto cleanup; \n\ + skel->maps.%1$s.initial_value = (__u64) (long) skel->%1$s;\n\ + } \n\ + ", ident, bpf_map_mmap_sz(map)); } codegen("\ \n\ @@ -733,32 +738,30 @@ static int gen_trace(struct bpf_object *obj, const char *obj_name, const char *h { \n\ struct bpf_load_and_run_opts opts = {}; \n\ int err; \n\ - \n\ - opts.ctx = (struct bpf_loader_ctx *)skel; \n\ - opts.data_sz = %2$d; \n\ - opts.data = (void *)\"\\ \n\ + static const char opts_data[] __attribute__((aligned__(8))) = \"\\\n\ ", - obj_name, opts.data_sz); + obj_name); print_hex(opts.data, opts.data_sz); codegen("\ \n\ \"; \n\ + static const char opts_insn[] __attribute__((aligned__(8))) = \"\\\n\ "); - - codegen("\ - \n\ - opts.insns_sz = %d; \n\ - opts.insns = (void *)\"\\ \n\ - ", - opts.insns_sz); print_hex(opts.insns, opts.insns_sz); codegen("\ \n\ \"; \n\ + \n\ + opts.ctx = (struct bpf_loader_ctx *)skel; \n\ + opts.data_sz = sizeof(opts_data) - 1; \n\ + opts.data = (void *)opts_data; \n\ + opts.insns_sz = sizeof(opts_insn) - 1; \n\ + opts.insns = (void *)opts_insn; \n\ + \n\ err = bpf_load_and_run(&opts); \n\ if (err < 0) \n\ return err; \n\ - ", obj_name); + "); bpf_object__for_each_map(map, obj) { const char *mmap_flags;