From patchwork Thu Aug 20 23:12:49 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrii Nakryiko X-Patchwork-Id: 1348712 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Original-To: incoming-bpf@patchwork.ozlabs.org Delivered-To: patchwork-incoming-bpf@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=bpf-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=reject dis=none) header.from=fb.com Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=fb.com header.i=@fb.com header.a=rsa-sha256 header.s=facebook header.b=ofkMdwWS; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4BXgSZ00Vlz9sTF for ; Fri, 21 Aug 2020 09:13:49 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728835AbgHTXNs (ORCPT ); Thu, 20 Aug 2020 19:13:48 -0400 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:9368 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728671AbgHTXNp (ORCPT ); Thu, 20 Aug 2020 19:13:45 -0400 Received: from pps.filterd (m0148461.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 07KNDh4C010706 for ; Thu, 20 Aug 2020 16:13:44 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=facebook; bh=H//rWwJdbOlGbj7elCGrxYKN8huBl+dkeYvObf3XQcI=; b=ofkMdwWSas9orWirfRqSMo3miEpgtZ+/yplREm5rJbjRvfpxDdy4y1VZm4s3tkc29Q5U IAbfq9YfPI8g3d9xad1HyLPrGMdQQUX1Svmw8FPhZaZv/IVXoFy1y6JRhwklLPvd+gcC iF08TE8zifcLPQp8ECkZ7nwY7z3el3BzxPg= Received: from maileast.thefacebook.com ([163.114.130.16]) by mx0a-00082601.pphosted.com with ESMTP id 3304m39epm-2 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Thu, 20 Aug 2020 16:13:43 -0700 Received: from intmgw002.08.frc2.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:83::4) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1979.3; Thu, 20 Aug 2020 16:13:30 -0700 Received: by devbig012.ftw2.facebook.com (Postfix, from userid 137359) id C3F902EC5F42; Thu, 20 Aug 2020 16:13:25 -0700 (PDT) Smtp-Origin-Hostprefix: devbig From: Andrii Nakryiko Smtp-Origin-Hostname: devbig012.ftw2.facebook.com To: , , , CC: , , Andrii Nakryiko Smtp-Origin-Cluster: ftw2c04 Subject: [PATCH bpf-next 15/16] libbpf: deprecate notion of BPF program "title" in favor of "section name" Date: Thu, 20 Aug 2020 16:12:49 -0700 Message-ID: <20200820231250.1293069-16-andriin@fb.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200820231250.1293069-1-andriin@fb.com> References: <20200820231250.1293069-1-andriin@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-08-20_07:2020-08-19,2020-08-20 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 mlxlogscore=999 impostorscore=0 mlxscore=0 bulkscore=0 suspectscore=29 spamscore=0 phishscore=0 lowpriorityscore=0 malwarescore=0 clxscore=1015 adultscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2008200190 X-FB-Internal: deliver Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org BPF program title is ambigious and misleading term. It is ELF section name, so let's just call it that and deprecate bpf_program__title() API in favor of bpf_program__section_name(). Additionally, using bpf_object__find_program_by_title() is now inherently dangerous and ambiguous, as multiple BPF program can have the same section name. So deprecate this API as well and recommend to switch to non-ambiguous bpf_object__find_program_by_name(). Internally, clean up usage and mis-usage of BPF program section name for denoting BPF program name. Shorten the field name to prog->sec_name to be consistent with all other prog->sec_* variables. Signed-off-by: Andrii Nakryiko --- tools/lib/bpf/libbpf.c | 217 +++++++++++++++++---------------------- tools/lib/bpf/libbpf.h | 5 +- tools/lib/bpf/libbpf.map | 5 + 3 files changed, 105 insertions(+), 122 deletions(-) diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index c6edd8eb614b..f04e3897eb15 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -216,7 +216,7 @@ struct bpf_sec_def { */ struct bpf_program { const struct bpf_sec_def *sec_def; - char *section_name; + char *sec_name; size_t sec_idx; /* this program's instruction offset (in number of instructions) * within its containing ELF section @@ -238,7 +238,7 @@ struct bpf_program { size_t sub_insn_off; char *name; - /* section_name with / replaced by _; makes recursive pinning + /* sec_name with / replaced by _; makes recursive pinning * in bpf_object__pin_programs easier */ char *pin_name; @@ -514,7 +514,7 @@ static void bpf_program__exit(struct bpf_program *prog) bpf_program__unload(prog); zfree(&prog->name); - zfree(&prog->section_name); + zfree(&prog->sec_name); zfree(&prog->pin_name); zfree(&prog->insns); zfree(&prog->reloc_desc); @@ -528,7 +528,7 @@ static char *__bpf_program__pin_name(struct bpf_program *prog) { char *name, *p; - name = p = strdup(prog->section_name); + name = p = strdup(prog->sec_name); while ((p = strchr(p, '/'))) *p = '_'; @@ -573,8 +573,8 @@ bpf_object__init_prog(struct bpf_object *obj, struct bpf_program *prog, prog->instances.fds = NULL; prog->instances.nr = -1; - prog->section_name = strdup(sec_name); - if (!prog->section_name) + prog->sec_name = strdup(sec_name); + if (!prog->sec_name) goto errout; prog->name = strdup(name); @@ -3252,7 +3252,7 @@ bpf_object__find_program_by_title(const struct bpf_object *obj, struct bpf_program *pos; bpf_object__for_each_program(pos, obj) { - if (pos->section_name && !strcmp(pos->section_name, title)) + if (pos->sec_name && !strcmp(pos->sec_name, title)) return pos; } return NULL; @@ -4992,8 +4992,7 @@ static int bpf_core_calc_field_relo(const struct bpf_program *prog, *val = sz; } else { pr_warn("prog '%s': relo %d at insn #%d can't be applied to array access\n", - bpf_program__title(prog, false), - relo->kind, relo->insn_off / 8); + prog->name, relo->kind, relo->insn_off / 8); return -EINVAL; } if (validate) @@ -5015,8 +5014,7 @@ static int bpf_core_calc_field_relo(const struct bpf_program *prog, if (byte_sz >= 8) { /* bitfield can't be read with 64-bit read */ pr_warn("prog '%s': relo %d at insn #%d can't be satisfied for bitfield\n", - bpf_program__title(prog, false), - relo->kind, relo->insn_off / 8); + prog->name, relo->kind, relo->insn_off / 8); return -E2BIG; } byte_sz *= 2; @@ -5181,8 +5179,8 @@ static int bpf_core_calc_relo(const struct bpf_program *prog, } else if (err == -EOPNOTSUPP) { /* EOPNOTSUPP means unknown/unsupported relocation */ pr_warn("prog '%s': relo #%d: unrecognized CO-RE relocation %s (%d) at insn #%d\n", - bpf_program__title(prog, false), relo_idx, - core_relo_kind_str(relo->kind), relo->kind, relo->insn_off / 8); + prog->name, relo_idx, core_relo_kind_str(relo->kind), + relo->kind, relo->insn_off / 8); } return err; @@ -5196,7 +5194,7 @@ static void bpf_core_poison_insn(struct bpf_program *prog, int relo_idx, int insn_idx, struct bpf_insn *insn) { pr_debug("prog '%s': relo #%d: substituting insn #%d w/ invalid insn\n", - bpf_program__title(prog, false), relo_idx, insn_idx); + prog->name, relo_idx, insn_idx); insn->code = BPF_JMP | BPF_CALL; insn->dst_reg = 0; insn->src_reg = 0; @@ -5268,14 +5266,14 @@ static int bpf_core_patch_insn(struct bpf_program *prog, return -EINVAL; if (res->validate && insn->imm != orig_val) { pr_warn("prog '%s': relo #%d: unexpected insn #%d (ALU/ALU64) value: got %u, exp %u -> %u\n", - bpf_program__title(prog, false), relo_idx, + prog->name, relo_idx, insn_idx, insn->imm, orig_val, new_val); return -EINVAL; } orig_val = insn->imm; insn->imm = new_val; pr_debug("prog '%s': relo #%d: patched insn #%d (ALU/ALU64) imm %u -> %u\n", - bpf_program__title(prog, false), relo_idx, insn_idx, + prog->name, relo_idx, insn_idx, orig_val, new_val); break; case BPF_LDX: @@ -5283,21 +5281,18 @@ static int bpf_core_patch_insn(struct bpf_program *prog, case BPF_STX: if (res->validate && insn->off != orig_val) { pr_warn("prog '%s': relo #%d: unexpected insn #%d (LDX/ST/STX) value: got %u, exp %u -> %u\n", - bpf_program__title(prog, false), relo_idx, - insn_idx, insn->off, orig_val, new_val); + prog->name, relo_idx, insn_idx, insn->off, orig_val, new_val); return -EINVAL; } if (new_val > SHRT_MAX) { pr_warn("prog '%s': relo #%d: insn #%d (LDX/ST/STX) value too big: %u\n", - bpf_program__title(prog, false), relo_idx, - insn_idx, new_val); + prog->name, relo_idx, insn_idx, new_val); return -ERANGE; } orig_val = insn->off; insn->off = new_val; pr_debug("prog '%s': relo #%d: patched insn #%d (LDX/ST/STX) off %u -> %u\n", - bpf_program__title(prog, false), relo_idx, insn_idx, - orig_val, new_val); + prog->name, relo_idx, insn_idx, orig_val, new_val); break; case BPF_LD: { __u64 imm; @@ -5308,30 +5303,27 @@ static int bpf_core_patch_insn(struct bpf_program *prog, insn[1].code != 0 || insn[1].dst_reg != 0 || insn[1].src_reg != 0 || insn[1].off != 0) { pr_warn("prog '%s': relo #%d: insn #%d (LDIMM64) has unexpected form\n", - bpf_program__title(prog, false), relo_idx, insn_idx); + prog->name, relo_idx, insn_idx); return -EINVAL; } imm = insn[0].imm + ((__u64)insn[1].imm << 32); if (res->validate && imm != orig_val) { pr_warn("prog '%s': relo #%d: unexpected insn #%d (LDIMM64) value: got %llu, exp %u -> %u\n", - bpf_program__title(prog, false), relo_idx, - insn_idx, imm, orig_val, new_val); + prog->name, relo_idx, insn_idx, imm, orig_val, new_val); return -EINVAL; } insn[0].imm = new_val; insn[1].imm = 0; /* currently only 32-bit values are supported */ pr_debug("prog '%s': relo #%d: patched insn #%d (LDIMM64) imm64 %llu -> %u\n", - bpf_program__title(prog, false), relo_idx, insn_idx, - imm, new_val); + prog->name, relo_idx, insn_idx, imm, new_val); break; } default: pr_warn("prog '%s': relo #%d: trying to relocate unrecognized insn #%d, code:0x%x, src:0x%x, dst:0x%x, off:0x%x, imm:0x%x\n", - bpf_program__title(prog, false), relo_idx, - insn_idx, insn->code, insn->src_reg, insn->dst_reg, - insn->off, insn->imm); + prog->name, relo_idx, insn_idx, insn->code, + insn->src_reg, insn->dst_reg, insn->off, insn->imm); return -EINVAL; } @@ -5461,7 +5453,6 @@ static int bpf_core_apply_relo(struct bpf_program *prog, const struct btf *targ_btf, struct hashmap *cand_cache) { - const char *prog_name = bpf_program__title(prog, false); struct bpf_core_spec local_spec, cand_spec, targ_spec; const void *type_key = u32_as_hash_key(relo->type_id); struct bpf_core_relo_res cand_res, targ_res; @@ -5488,13 +5479,13 @@ static int bpf_core_apply_relo(struct bpf_program *prog, err = bpf_core_parse_spec(local_btf, local_id, spec_str, relo->kind, &local_spec); if (err) { pr_warn("prog '%s': relo #%d: parsing [%d] %s %s + %s failed: %d\n", - prog_name, relo_idx, local_id, btf_kind_str(local_type), + prog->name, relo_idx, local_id, btf_kind_str(local_type), str_is_empty(local_name) ? "" : local_name, spec_str, err); return -EINVAL; } - pr_debug("prog '%s': relo #%d: kind <%s> (%d), spec is ", prog_name, + pr_debug("prog '%s': relo #%d: kind <%s> (%d), spec is ", prog->name, relo_idx, core_relo_kind_str(relo->kind), relo->kind); bpf_core_dump_spec(LIBBPF_DEBUG, &local_spec); libbpf_print(LIBBPF_DEBUG, "\n"); @@ -5511,7 +5502,7 @@ static int bpf_core_apply_relo(struct bpf_program *prog, /* libbpf doesn't support candidate search for anonymous types */ if (str_is_empty(spec_str)) { pr_warn("prog '%s': relo #%d: <%s> (%d) relocation doesn't support anonymous types\n", - prog_name, relo_idx, core_relo_kind_str(relo->kind), relo->kind); + prog->name, relo_idx, core_relo_kind_str(relo->kind), relo->kind); return -EOPNOTSUPP; } @@ -5519,7 +5510,7 @@ static int bpf_core_apply_relo(struct bpf_program *prog, cand_ids = bpf_core_find_cands(local_btf, local_id, targ_btf); if (IS_ERR(cand_ids)) { pr_warn("prog '%s': relo #%d: target candidate search failed for [%d] %s %s: %ld", - prog_name, relo_idx, local_id, btf_kind_str(local_type), + prog->name, relo_idx, local_id, btf_kind_str(local_type), local_name, PTR_ERR(cand_ids)); return PTR_ERR(cand_ids); } @@ -5535,13 +5526,13 @@ static int bpf_core_apply_relo(struct bpf_program *prog, err = bpf_core_spec_match(&local_spec, targ_btf, cand_id, &cand_spec); if (err < 0) { pr_warn("prog '%s': relo #%d: error matching candidate #%d ", - prog_name, relo_idx, i); + prog->name, relo_idx, i); bpf_core_dump_spec(LIBBPF_WARN, &cand_spec); libbpf_print(LIBBPF_WARN, ": %d\n", err); return err; } - pr_debug("prog '%s': relo #%d: %s candidate #%d ", prog_name, + pr_debug("prog '%s': relo #%d: %s candidate #%d ", prog->name, relo_idx, err == 0 ? "non-matching" : "matching", i); bpf_core_dump_spec(LIBBPF_DEBUG, &cand_spec); libbpf_print(LIBBPF_DEBUG, "\n"); @@ -5561,7 +5552,7 @@ static int bpf_core_apply_relo(struct bpf_program *prog, * should all resolve to the same bit offset */ pr_warn("prog '%s': relo #%d: field offset ambiguity: %u != %u\n", - prog_name, relo_idx, cand_spec.bit_offset, + prog->name, relo_idx, cand_spec.bit_offset, targ_spec.bit_offset); return -EINVAL; } else if (cand_res.poison != targ_res.poison || cand_res.new_val != targ_res.new_val) { @@ -5570,7 +5561,7 @@ static int bpf_core_apply_relo(struct bpf_program *prog, * proceed due to ambiguity */ pr_warn("prog '%s': relo #%d: relocation decision ambiguity: %s %u != %s %u\n", - prog_name, relo_idx, + prog->name, relo_idx, cand_res.poison ? "failure" : "success", cand_res.new_val, targ_res.poison ? "failure" : "success", targ_res.new_val); return -EINVAL; @@ -5603,7 +5594,7 @@ static int bpf_core_apply_relo(struct bpf_program *prog, */ if (j == 0) { pr_debug("prog '%s': relo #%d: no matching targets found\n", - prog_name, relo_idx); + prog->name, relo_idx); /* calculate single target relo result explicitly */ err = bpf_core_calc_relo(prog, relo, relo_idx, &local_spec, NULL, &targ_res); @@ -5616,7 +5607,7 @@ static int bpf_core_apply_relo(struct bpf_program *prog, err = bpf_core_patch_insn(prog, relo, relo_idx, &targ_res); if (err) { pr_warn("prog '%s': relo #%d: failed to patch insn at offset %d: %d\n", - prog_name, relo_idx, relo->insn_off, err); + prog->name, relo_idx, relo->insn_off, err); return -EINVAL; } @@ -5670,7 +5661,7 @@ bpf_object__relocate_core(struct bpf_object *obj, const char *targ_btf_path) prog = NULL; for (i = 0; i < obj->nr_programs; i++) { prog = &obj->programs[i]; - if (strcmp(prog->section_name, sec_name) == 0) + if (strcmp(prog->sec_name, sec_name) == 0) break; } if (!prog) { @@ -5784,7 +5775,7 @@ static int adjust_prog_btf_ext_info(const struct bpf_object *obj, sec_name = btf__name_by_offset(obj->btf, sec->sec_name_off); if (!sec_name) return -EINVAL; - if (strcmp(sec_name, prog->section_name) != 0) + if (strcmp(sec_name, prog->sec_name) != 0) continue; for_each_btf_ext_rec(ext_info, sec, i, rec) { @@ -6435,8 +6426,7 @@ int bpf_program__load(struct bpf_program *prog, char *license, __u32 kern_ver) int err = 0, fd, i, btf_id; if (prog->obj->loaded) { - pr_warn("prog '%s'('%s'): can't load after object was loaded\n", - prog->name, prog->section_name); + pr_warn("prog '%s': can't load after object was loaded\n", prog->name); return -EINVAL; } @@ -6452,7 +6442,7 @@ int bpf_program__load(struct bpf_program *prog, char *license, __u32 kern_ver) if (prog->instances.nr < 0 || !prog->instances.fds) { if (prog->preprocessor) { pr_warn("Internal error: can't load program '%s'\n", - prog->section_name); + prog->name); return -LIBBPF_ERRNO__INTERNAL; } @@ -6467,8 +6457,8 @@ int bpf_program__load(struct bpf_program *prog, char *license, __u32 kern_ver) if (!prog->preprocessor) { if (prog->instances.nr != 1) { - pr_warn("Program '%s' is inconsistent: nr(%d) != 1\n", - prog->section_name, prog->instances.nr); + pr_warn("prog '%s': inconsistent nr(%d) != 1\n", + prog->name, prog->instances.nr); } err = load_program(prog, prog->insns, prog->insns_cnt, license, kern_ver, &fd); @@ -6486,13 +6476,13 @@ int bpf_program__load(struct bpf_program *prog, char *license, __u32 kern_ver) prog->insns_cnt, &result); if (err) { pr_warn("Preprocessing the %dth instance of program '%s' failed\n", - i, prog->section_name); + i, prog->name); goto out; } if (!result.new_insn_ptr || !result.new_insn_cnt) { pr_debug("Skip loading the %dth instance of program '%s'\n", - i, prog->section_name); + i, prog->name); prog->instances.fds[i] = -1; if (result.pfd) *result.pfd = -1; @@ -6503,7 +6493,7 @@ int bpf_program__load(struct bpf_program *prog, char *license, __u32 kern_ver) result.new_insn_cnt, license, kern_ver, &fd); if (err) { pr_warn("Loading the %dth instance of program '%s' failed\n", - i, prog->section_name); + i, prog->name); goto out; } @@ -6513,7 +6503,7 @@ int bpf_program__load(struct bpf_program *prog, char *license, __u32 kern_ver) } out: if (err) - pr_warn("failed to load program '%s'\n", prog->section_name); + pr_warn("failed to load program '%s'\n", prog->name); zfree(&prog->insns); prog->insns_cnt = 0; return err; @@ -6605,7 +6595,7 @@ __bpf_object__open(const char *path, const void *obj_buf, size_t obj_buf_sz, bpf_object__elf_finish(obj); bpf_object__for_each_program(prog, obj) { - prog->sec_def = find_sec_def(prog->section_name); + prog->sec_def = find_sec_def(prog->sec_name); if (!prog->sec_def) /* couldn't guess, but user might manually specify */ continue; @@ -6984,7 +6974,7 @@ int bpf_program__pin_instance(struct bpf_program *prog, const char *path, if (instance < 0 || instance >= prog->instances.nr) { pr_warn("invalid prog instance %d of prog %s (max %d)\n", - instance, prog->section_name, prog->instances.nr); + instance, prog->name, prog->instances.nr); return -EINVAL; } @@ -7015,7 +7005,7 @@ int bpf_program__unpin_instance(struct bpf_program *prog, const char *path, if (instance < 0 || instance >= prog->instances.nr) { pr_warn("invalid prog instance %d of prog %s (max %d)\n", - instance, prog->section_name, prog->instances.nr); + instance, prog->name, prog->instances.nr); return -EINVAL; } @@ -7045,8 +7035,7 @@ int bpf_program__pin(struct bpf_program *prog, const char *path) } if (prog->instances.nr <= 0) { - pr_warn("no instances of prog %s to pin\n", - prog->section_name); + pr_warn("no instances of prog %s to pin\n", prog->name); return -EINVAL; } @@ -7108,8 +7097,7 @@ int bpf_program__unpin(struct bpf_program *prog, const char *path) } if (prog->instances.nr <= 0) { - pr_warn("no instances of prog %s to pin\n", - prog->section_name); + pr_warn("no instances of prog %s to pin\n", prog->name); return -EINVAL; } @@ -7644,11 +7632,16 @@ const char *bpf_program__name(const struct bpf_program *prog) return prog->name; } +const char *bpf_program__section_name(const struct bpf_program *prog) +{ + return prog->sec_name; +} + const char *bpf_program__title(const struct bpf_program *prog, bool needs_copy) { const char *title; - title = prog->section_name; + title = prog->sec_name; if (needs_copy) { title = strdup(title); if (!title) { @@ -7721,14 +7714,14 @@ int bpf_program__nth_fd(const struct bpf_program *prog, int n) if (n >= prog->instances.nr || n < 0) { pr_warn("Can't get the %dth fd from program %s: only %d instances\n", - n, prog->section_name, prog->instances.nr); + n, prog->name, prog->instances.nr); return -EINVAL; } fd = prog->instances.fds[n]; if (fd < 0) { pr_warn("%dth instance of program '%s' is invalid\n", - n, prog->section_name); + n, prog->name); return -ENOENT; } @@ -8145,7 +8138,7 @@ static int bpf_object__collect_st_ops_relos(struct bpf_object *obj, if (prog->type == BPF_PROG_TYPE_UNSPEC) { const struct bpf_sec_def *sec_def; - sec_def = find_sec_def(prog->section_name); + sec_def = find_sec_def(prog->sec_name); if (sec_def && sec_def->prog_type != BPF_PROG_TYPE_STRUCT_OPS) { /* for pr_warn */ @@ -8168,7 +8161,7 @@ static int bpf_object__collect_st_ops_relos(struct bpf_object *obj, invalid_prog: pr_warn("struct_ops reloc %s: cannot use prog %s in sec %s with type %u attach_btf_id %u expected_attach_type %u for func ptr %s\n", - map->name, prog->name, prog->section_name, prog->type, + map->name, prog->name, prog->sec_name, prog->type, prog->attach_btf_id, prog->expected_attach_type, name); return -EINVAL; } @@ -8272,7 +8265,7 @@ static int libbpf_find_attach_btf_id(struct bpf_program *prog) { enum bpf_attach_type attach_type = prog->expected_attach_type; __u32 attach_prog_fd = prog->attach_prog_fd; - const char *name = prog->section_name; + const char *name = prog->sec_name; int i, err; if (!name) @@ -8799,14 +8792,14 @@ struct bpf_link *bpf_program__attach_perf_event(struct bpf_program *prog, int prog_fd, err; if (pfd < 0) { - pr_warn("program '%s': invalid perf event FD %d\n", - bpf_program__title(prog, false), pfd); + pr_warn("prog '%s': invalid perf event FD %d\n", + prog->name, pfd); return ERR_PTR(-EINVAL); } prog_fd = bpf_program__fd(prog); if (prog_fd < 0) { - pr_warn("program '%s': can't attach BPF program w/o FD (did you load it?)\n", - bpf_program__title(prog, false)); + pr_warn("prog '%s': can't attach BPF program w/o FD (did you load it?)\n", + prog->name); return ERR_PTR(-EINVAL); } @@ -8819,20 +8812,18 @@ struct bpf_link *bpf_program__attach_perf_event(struct bpf_program *prog, if (ioctl(pfd, PERF_EVENT_IOC_SET_BPF, prog_fd) < 0) { err = -errno; free(link); - pr_warn("program '%s': failed to attach to pfd %d: %s\n", - bpf_program__title(prog, false), pfd, - libbpf_strerror_r(err, errmsg, sizeof(errmsg))); + pr_warn("prog '%s': failed to attach to pfd %d: %s\n", + prog->name, pfd, libbpf_strerror_r(err, errmsg, sizeof(errmsg))); if (err == -EPROTO) - pr_warn("program '%s': try add PERF_SAMPLE_CALLCHAIN to or remove exclude_callchain_[kernel|user] from pfd %d\n", - bpf_program__title(prog, false), pfd); + pr_warn("prog '%s': try add PERF_SAMPLE_CALLCHAIN to or remove exclude_callchain_[kernel|user] from pfd %d\n", + prog->name, pfd); return ERR_PTR(err); } if (ioctl(pfd, PERF_EVENT_IOC_ENABLE, 0) < 0) { err = -errno; free(link); - pr_warn("program '%s': failed to enable pfd %d: %s\n", - bpf_program__title(prog, false), pfd, - libbpf_strerror_r(err, errmsg, sizeof(errmsg))); + pr_warn("prog '%s': failed to enable pfd %d: %s\n", + prog->name, pfd, libbpf_strerror_r(err, errmsg, sizeof(errmsg))); return ERR_PTR(err); } return link; @@ -8954,9 +8945,8 @@ struct bpf_link *bpf_program__attach_kprobe(struct bpf_program *prog, pfd = perf_event_open_probe(false /* uprobe */, retprobe, func_name, 0 /* offset */, -1 /* pid */); if (pfd < 0) { - pr_warn("program '%s': failed to create %s '%s' perf event: %s\n", - bpf_program__title(prog, false), - retprobe ? "kretprobe" : "kprobe", func_name, + pr_warn("prog '%s': failed to create %s '%s' perf event: %s\n", + prog->name, retprobe ? "kretprobe" : "kprobe", func_name, libbpf_strerror_r(pfd, errmsg, sizeof(errmsg))); return ERR_PTR(pfd); } @@ -8964,9 +8954,8 @@ struct bpf_link *bpf_program__attach_kprobe(struct bpf_program *prog, if (IS_ERR(link)) { close(pfd); err = PTR_ERR(link); - pr_warn("program '%s': failed to attach to %s '%s': %s\n", - bpf_program__title(prog, false), - retprobe ? "kretprobe" : "kprobe", func_name, + pr_warn("prog '%s': failed to attach to %s '%s': %s\n", + prog->name, retprobe ? "kretprobe" : "kprobe", func_name, libbpf_strerror_r(err, errmsg, sizeof(errmsg))); return link; } @@ -8979,7 +8968,7 @@ static struct bpf_link *attach_kprobe(const struct bpf_sec_def *sec, const char *func_name; bool retprobe; - func_name = bpf_program__title(prog, false) + sec->len; + func_name = prog->sec_name + sec->len; retprobe = strcmp(sec->sec, "kretprobe/") == 0; return bpf_program__attach_kprobe(prog, retprobe, func_name); @@ -8997,9 +8986,8 @@ struct bpf_link *bpf_program__attach_uprobe(struct bpf_program *prog, pfd = perf_event_open_probe(true /* uprobe */, retprobe, binary_path, func_offset, pid); if (pfd < 0) { - pr_warn("program '%s': failed to create %s '%s:0x%zx' perf event: %s\n", - bpf_program__title(prog, false), - retprobe ? "uretprobe" : "uprobe", + pr_warn("prog '%s': failed to create %s '%s:0x%zx' perf event: %s\n", + prog->name, retprobe ? "uretprobe" : "uprobe", binary_path, func_offset, libbpf_strerror_r(pfd, errmsg, sizeof(errmsg))); return ERR_PTR(pfd); @@ -9008,9 +8996,8 @@ struct bpf_link *bpf_program__attach_uprobe(struct bpf_program *prog, if (IS_ERR(link)) { close(pfd); err = PTR_ERR(link); - pr_warn("program '%s': failed to attach to %s '%s:0x%zx': %s\n", - bpf_program__title(prog, false), - retprobe ? "uretprobe" : "uprobe", + pr_warn("prog '%s': failed to attach to %s '%s:0x%zx': %s\n", + prog->name, retprobe ? "uretprobe" : "uprobe", binary_path, func_offset, libbpf_strerror_r(err, errmsg, sizeof(errmsg))); return link; @@ -9078,9 +9065,8 @@ struct bpf_link *bpf_program__attach_tracepoint(struct bpf_program *prog, pfd = perf_event_open_tracepoint(tp_category, tp_name); if (pfd < 0) { - pr_warn("program '%s': failed to create tracepoint '%s/%s' perf event: %s\n", - bpf_program__title(prog, false), - tp_category, tp_name, + pr_warn("prog '%s': failed to create tracepoint '%s/%s' perf event: %s\n", + prog->name, tp_category, tp_name, libbpf_strerror_r(pfd, errmsg, sizeof(errmsg))); return ERR_PTR(pfd); } @@ -9088,9 +9074,8 @@ struct bpf_link *bpf_program__attach_tracepoint(struct bpf_program *prog, if (IS_ERR(link)) { close(pfd); err = PTR_ERR(link); - pr_warn("program '%s': failed to attach to tracepoint '%s/%s': %s\n", - bpf_program__title(prog, false), - tp_category, tp_name, + pr_warn("prog '%s': failed to attach to tracepoint '%s/%s': %s\n", + prog->name, tp_category, tp_name, libbpf_strerror_r(err, errmsg, sizeof(errmsg))); return link; } @@ -9103,7 +9088,7 @@ static struct bpf_link *attach_tp(const struct bpf_sec_def *sec, char *sec_name, *tp_cat, *tp_name; struct bpf_link *link; - sec_name = strdup(bpf_program__title(prog, false)); + sec_name = strdup(prog->sec_name); if (!sec_name) return ERR_PTR(-ENOMEM); @@ -9132,8 +9117,7 @@ struct bpf_link *bpf_program__attach_raw_tracepoint(struct bpf_program *prog, prog_fd = bpf_program__fd(prog); if (prog_fd < 0) { - pr_warn("program '%s': can't attach before loaded\n", - bpf_program__title(prog, false)); + pr_warn("prog '%s': can't attach before loaded\n", prog->name); return ERR_PTR(-EINVAL); } @@ -9146,9 +9130,8 @@ struct bpf_link *bpf_program__attach_raw_tracepoint(struct bpf_program *prog, if (pfd < 0) { pfd = -errno; free(link); - pr_warn("program '%s': failed to attach to raw tracepoint '%s': %s\n", - bpf_program__title(prog, false), tp_name, - libbpf_strerror_r(pfd, errmsg, sizeof(errmsg))); + pr_warn("prog '%s': failed to attach to raw tracepoint '%s': %s\n", + prog->name, tp_name, libbpf_strerror_r(pfd, errmsg, sizeof(errmsg))); return ERR_PTR(pfd); } link->fd = pfd; @@ -9158,7 +9141,7 @@ struct bpf_link *bpf_program__attach_raw_tracepoint(struct bpf_program *prog, static struct bpf_link *attach_raw_tp(const struct bpf_sec_def *sec, struct bpf_program *prog) { - const char *tp_name = bpf_program__title(prog, false) + sec->len; + const char *tp_name = prog->sec_name + sec->len; return bpf_program__attach_raw_tracepoint(prog, tp_name); } @@ -9172,8 +9155,7 @@ static struct bpf_link *bpf_program__attach_btf_id(struct bpf_program *prog) prog_fd = bpf_program__fd(prog); if (prog_fd < 0) { - pr_warn("program '%s': can't attach before loaded\n", - bpf_program__title(prog, false)); + pr_warn("prog '%s': can't attach before loaded\n", prog->name); return ERR_PTR(-EINVAL); } @@ -9186,9 +9168,8 @@ static struct bpf_link *bpf_program__attach_btf_id(struct bpf_program *prog) if (pfd < 0) { pfd = -errno; free(link); - pr_warn("program '%s': failed to attach: %s\n", - bpf_program__title(prog, false), - libbpf_strerror_r(pfd, errmsg, sizeof(errmsg))); + pr_warn("prog '%s': failed to attach: %s\n", + prog->name, libbpf_strerror_r(pfd, errmsg, sizeof(errmsg))); return ERR_PTR(pfd); } link->fd = pfd; @@ -9234,8 +9215,7 @@ bpf_program__attach_fd(struct bpf_program *prog, int target_fd, prog_fd = bpf_program__fd(prog); if (prog_fd < 0) { - pr_warn("program '%s': can't attach before loaded\n", - bpf_program__title(prog, false)); + pr_warn("prog '%s': can't attach before loaded\n", prog->name); return ERR_PTR(-EINVAL); } @@ -9249,8 +9229,8 @@ bpf_program__attach_fd(struct bpf_program *prog, int target_fd, if (link_fd < 0) { link_fd = -errno; free(link); - pr_warn("program '%s': failed to attach to %s: %s\n", - bpf_program__title(prog, false), target_name, + pr_warn("prog '%s': failed to attach to %s: %s\n", + prog->name, target_name, libbpf_strerror_r(link_fd, errmsg, sizeof(errmsg))); return ERR_PTR(link_fd); } @@ -9294,8 +9274,7 @@ bpf_program__attach_iter(struct bpf_program *prog, prog_fd = bpf_program__fd(prog); if (prog_fd < 0) { - pr_warn("program '%s': can't attach before loaded\n", - bpf_program__title(prog, false)); + pr_warn("prog '%s': can't attach before loaded\n", prog->name); return ERR_PTR(-EINVAL); } @@ -9309,9 +9288,8 @@ bpf_program__attach_iter(struct bpf_program *prog, if (link_fd < 0) { link_fd = -errno; free(link); - pr_warn("program '%s': failed to attach to iterator: %s\n", - bpf_program__title(prog, false), - libbpf_strerror_r(link_fd, errmsg, sizeof(errmsg))); + pr_warn("prog '%s': failed to attach to iterator: %s\n", + prog->name, libbpf_strerror_r(link_fd, errmsg, sizeof(errmsg))); return ERR_PTR(link_fd); } link->fd = link_fd; @@ -9322,7 +9300,7 @@ struct bpf_link *bpf_program__attach(struct bpf_program *prog) { const struct bpf_sec_def *sec_def; - sec_def = find_sec_def(bpf_program__title(prog, false)); + sec_def = find_sec_def(prog->sec_name); if (!sec_def || !sec_def->attach_fn) return ERR_PTR(-ESRCH); @@ -10338,12 +10316,11 @@ int bpf_object__attach_skeleton(struct bpf_object_skeleton *s) struct bpf_program *prog = *s->progs[i].prog; struct bpf_link **link = s->progs[i].link; const struct bpf_sec_def *sec_def; - const char *sec_name = bpf_program__title(prog, false); if (!prog->load) continue; - sec_def = find_sec_def(sec_name); + sec_def = find_sec_def(prog->sec_name); if (!sec_def || !sec_def->attach_fn) continue; diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h index 5ecb4069a9f0..5119ed07e19d 100644 --- a/tools/lib/bpf/libbpf.h +++ b/tools/lib/bpf/libbpf.h @@ -198,8 +198,9 @@ LIBBPF_API void bpf_program__set_ifindex(struct bpf_program *prog, __u32 ifindex); LIBBPF_API const char *bpf_program__name(const struct bpf_program *prog); -LIBBPF_API const char *bpf_program__title(const struct bpf_program *prog, - bool needs_copy); +LIBBPF_API const char *bpf_program__section_name(const struct bpf_program *prog); +LIBBPF_API DEPRECATED("BPF program title is confusing term; please use bpf_program__section_name() instead") +const char *bpf_program__title(const struct bpf_program *prog, bool needs_copy); LIBBPF_API bool bpf_program__autoload(const struct bpf_program *prog); LIBBPF_API int bpf_program__set_autoload(struct bpf_program *prog, bool autoload); diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map index e35bd6cdbdbf..73ed54df3745 100644 --- a/tools/lib/bpf/libbpf.map +++ b/tools/lib/bpf/libbpf.map @@ -299,3 +299,8 @@ LIBBPF_0.1.0 { btf__set_fd; btf__set_pointer_size; } LIBBPF_0.0.9; + +LIBBPF_0.2.0 { + global: + bpf_program__section_name; +} LIBBPF_0.1.0;