From patchwork Sat May 8 03:48:24 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexei Starovoitov X-Patchwork-Id: 12245775 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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 C9158C43461 for ; Sat, 8 May 2021 03:49:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A5C1C611CC for ; Sat, 8 May 2021 03:49:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229947AbhEHDuA (ORCPT ); Fri, 7 May 2021 23:50:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34378 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231153AbhEHDt7 (ORCPT ); Fri, 7 May 2021 23:49:59 -0400 Received: from mail-pj1-x102d.google.com (mail-pj1-x102d.google.com [IPv6:2607:f8b0:4864:20::102d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 10296C061761 for ; Fri, 7 May 2021 20:48:58 -0700 (PDT) Received: by mail-pj1-x102d.google.com with SMTP id md17so6292948pjb.0 for ; Fri, 07 May 2021 20:48:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=a4f5LsGI83/jfgglNNDvyMZbbZCWkDq90kN1+mjqueY=; b=RqSlRW0cY4lKYrtg1S28scNtUBVDoSVG9el9nj2M8szAZ9+lXVfWAgSXDjhMtmKsa8 FFM5JRcc9fftT7WycUy/tQ1uZjSqw1fRz7Um6tt4xzDU6BacRwUgpObpGEl3Q2uBD1+f VWC/DDmJ54j15gTQp+H/9IBuXai2UA6cu70UApvimAtYLxi+UkJD1W14VXom50/d79xU QwaA0uRA/IiGK8EGQpyvo8PAKs0OJ2+yG/CZcDwyLaWtn+rI50MVArtQ9e5gjLytIqbF /kmFnvzdRx8S9ykbuo07x/OkDf6pqTmUsC6Orq9kFw/cNQZ3HfGHqcmFk7FUT9aTqEYg y8eA== 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=a4f5LsGI83/jfgglNNDvyMZbbZCWkDq90kN1+mjqueY=; b=TrRbWH6MOrMBzfg6FbNvI3Xz+IAu+cwGC3jGzWozrSXc0res93w2vRqNgho6iV2cfX RBUFs6DupaYosUF1qwV5kXYgZno+v40Kem75fGoRru+2+sDYnDUwCgmpruvNsehDMmcW nO14ayxGoX3DIH2sWet3PyK+qAEICO1xIiJIcPjdZM+qIPZGRM8h826zO8TPhBYkR9PJ vqOloWBCELsqUNrjCb5UbDjQtHrK5GwKxRkNBVLNioJ5YFJaP4h3l3jejDxACr3zcmc4 YXTRGpc6X0GjngATX+6plfLFLkVKh5pmR+ot1pCFAUhUMRo+Ryz6MTv7JAjIMpFSbETQ 49DQ== X-Gm-Message-State: AOAM5317dQ0a/iMjAd7SpbpRqEZUckMrzgwqZHkBdldG0mxfwVw7sMCa +kc/8LOm7SyI18W4oAl+51Mb0p9ABvQ= X-Google-Smtp-Source: ABdhPJwwIzNl5/rM3CrzBKQLh0qaUkM5ukL44qIwFNsTMpD+yUqU9B8AWpmef+Azw2qMMrUTZcl1oQ== X-Received: by 2002:a17:902:8b81:b029:eb:5a4:9cae with SMTP id ay1-20020a1709028b81b02900eb05a49caemr13738885plb.13.1620445737577; Fri, 07 May 2021 20:48:57 -0700 (PDT) Received: from ast-mbp.thefacebook.com ([163.114.132.1]) by smtp.gmail.com with ESMTPSA id u12sm5784606pfh.122.2021.05.07.20.48.55 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 07 May 2021 20:48:57 -0700 (PDT) From: Alexei Starovoitov To: davem@davemloft.net Cc: daniel@iogearbox.net, andrii@kernel.org, john.fastabend@gmail.com, bpf@vger.kernel.org, kernel-team@fb.com Subject: [PATCH v4 bpf-next 09/22] libbpf: Support for fd_idx Date: Fri, 7 May 2021 20:48:24 -0700 Message-Id: <20210508034837.64585-10-alexei.starovoitov@gmail.com> X-Mailer: git-send-email 2.13.5 In-Reply-To: <20210508034837.64585-1-alexei.starovoitov@gmail.com> References: <20210508034837.64585-1-alexei.starovoitov@gmail.com> Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net From: Alexei Starovoitov Add support for FD_IDX and make libbpf prefer that approach to loading programs to make testing and bisection easy. The next patch will fine tune libbpf behavior to use FEAT_FD_IDX only when generating loader program. Signed-off-by: Alexei Starovoitov --- tools/lib/bpf/bpf.c | 1 + tools/lib/bpf/libbpf.c | 73 +++++++++++++++++++++++++++++---- tools/lib/bpf/libbpf_internal.h | 1 + 3 files changed, 68 insertions(+), 7 deletions(-) diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c index bba48ff4c5c0..b96a3aba6fcc 100644 --- a/tools/lib/bpf/bpf.c +++ b/tools/lib/bpf/bpf.c @@ -252,6 +252,7 @@ int libbpf__bpf_prog_load(const struct bpf_prog_load_params *load_attr) attr.prog_btf_fd = load_attr->prog_btf_fd; attr.prog_flags = load_attr->prog_flags; + attr.fd_array = ptr_to_u64(load_attr->fd_array); attr.func_info_rec_size = load_attr->func_info_rec_size; attr.func_info_cnt = load_attr->func_info_cnt; diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index 491349a31a06..0b9270403a77 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -175,6 +175,8 @@ enum kern_feature_id { FEAT_MODULE_BTF, /* BTF_KIND_FLOAT support */ FEAT_BTF_FLOAT, + /* Kernel support for FD_IDX */ + FEAT_FD_IDX, __FEAT_CNT, }; @@ -288,6 +290,7 @@ struct bpf_program { __u32 line_info_rec_size; __u32 line_info_cnt; __u32 prog_flags; + int *fd_array; }; struct bpf_struct_ops { @@ -4238,6 +4241,29 @@ static int probe_module_btf(void) return !err; } +static int probe_kern_fd_idx(void) +{ + struct bpf_load_program_attr attr; + struct bpf_insn insns[] = { + BPF_LD_IMM64_RAW(BPF_REG_0, BPF_PSEUDO_MAP_IDX, 0), + BPF_EXIT_INSN(), + }; + int err; + + memset(&attr, 0, sizeof(attr)); + attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER; + attr.insns = insns; + attr.insns_cnt = ARRAY_SIZE(insns); + attr.license = "GPL"; + + err = bpf_load_program_xattr(&attr, NULL, 0); + if (err >= 0) { + close(err); + return 0; + } + return errno == EPROTO; +} + enum kern_feature_result { FEAT_UNKNOWN = 0, FEAT_SUPPORTED = 1, @@ -4288,6 +4314,9 @@ static struct kern_feature_desc { [FEAT_BTF_FLOAT] = { "BTF_KIND_FLOAT support", probe_kern_btf_float, }, + [FEAT_FD_IDX] = { + "prog_load with fd_idx", probe_kern_fd_idx, + }, }; static bool kernel_supports(enum kern_feature_id feat_id) @@ -6368,19 +6397,34 @@ bpf_object__relocate_data(struct bpf_object *obj, struct bpf_program *prog) switch (relo->type) { case RELO_LD64: - insn[0].src_reg = BPF_PSEUDO_MAP_FD; - insn[0].imm = obj->maps[relo->map_idx].fd; + if (kernel_supports(FEAT_FD_IDX)) { + insn[0].src_reg = BPF_PSEUDO_MAP_IDX; + insn[0].imm = relo->map_idx; + } else { + insn[0].src_reg = BPF_PSEUDO_MAP_FD; + insn[0].imm = obj->maps[relo->map_idx].fd; + } break; case RELO_DATA: - insn[0].src_reg = BPF_PSEUDO_MAP_VALUE; insn[1].imm = insn[0].imm + relo->sym_off; - insn[0].imm = obj->maps[relo->map_idx].fd; + if (kernel_supports(FEAT_FD_IDX)) { + insn[0].src_reg = BPF_PSEUDO_MAP_IDX_VALUE; + insn[0].imm = relo->map_idx; + } else { + insn[0].src_reg = BPF_PSEUDO_MAP_VALUE; + insn[0].imm = obj->maps[relo->map_idx].fd; + } break; case RELO_EXTERN_VAR: ext = &obj->externs[relo->sym_off]; if (ext->type == EXT_KCFG) { - insn[0].src_reg = BPF_PSEUDO_MAP_VALUE; - insn[0].imm = obj->maps[obj->kconfig_map_idx].fd; + if (kernel_supports(FEAT_FD_IDX)) { + insn[0].src_reg = BPF_PSEUDO_MAP_IDX_VALUE; + insn[0].imm = obj->kconfig_map_idx; + } else { + insn[0].src_reg = BPF_PSEUDO_MAP_VALUE; + insn[0].imm = obj->maps[obj->kconfig_map_idx].fd; + } insn[1].imm = ext->kcfg.data_off; } else /* EXT_KSYM */ { if (ext->ksym.type_id) { /* typed ksyms */ @@ -7106,6 +7150,7 @@ load_program(struct bpf_program *prog, struct bpf_insn *insns, int insns_cnt, load_attr.attach_btf_id = prog->attach_btf_id; load_attr.kern_version = kern_version; load_attr.prog_ifindex = prog->prog_ifindex; + load_attr.fd_array = prog->fd_array; /* specify func_info/line_info only if kernel supports them */ btf_fd = bpf_object__btf_fd(prog->obj); @@ -7296,6 +7341,7 @@ static int bpf_object__load_progs(struct bpf_object *obj, int log_level) { struct bpf_program *prog; + int *fd_array = NULL; size_t i; int err; @@ -7306,6 +7352,14 @@ bpf_object__load_progs(struct bpf_object *obj, int log_level) return err; } + if (kernel_supports(FEAT_FD_IDX) && obj->nr_maps) { + fd_array = malloc(sizeof(int) * obj->nr_maps); + if (!fd_array) + return -ENOMEM; + for (i = 0; i < obj->nr_maps; i++) + fd_array[i] = obj->maps[i].fd; + } + for (i = 0; i < obj->nr_programs; i++) { prog = &obj->programs[i]; if (prog_is_subprog(obj, prog)) @@ -7315,10 +7369,15 @@ bpf_object__load_progs(struct bpf_object *obj, int log_level) continue; } prog->log_level |= log_level; + prog->fd_array = fd_array; err = bpf_program__load(prog, obj->license, obj->kern_version); - if (err) + prog->fd_array = NULL; + if (err) { + free(fd_array); return err; + } } + free(fd_array); return 0; } diff --git a/tools/lib/bpf/libbpf_internal.h b/tools/lib/bpf/libbpf_internal.h index ee426226928f..2d4f4a995f35 100644 --- a/tools/lib/bpf/libbpf_internal.h +++ b/tools/lib/bpf/libbpf_internal.h @@ -249,6 +249,7 @@ struct bpf_prog_load_params { __u32 log_level; char *log_buf; size_t log_buf_sz; + int *fd_array; }; int libbpf__bpf_prog_load(const struct bpf_prog_load_params *load_attr);