Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752506AbcDTSCn (ORCPT ); Wed, 20 Apr 2016 14:02:43 -0400 Received: from szxga03-in.huawei.com ([119.145.14.66]:26307 "EHLO szxga03-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752461AbcDTSCk (ORCPT ); Wed, 20 Apr 2016 14:02:40 -0400 From: Wang Nan To: , , CC: , , Wang Nan , Arnaldo Carvalho de Melo , "Alexei Starovoitov" , Jiri Olsa , Li Zefan Subject: [RFC PATCH 04/13] bpf tools: Replace fd array to union array Date: Wed, 20 Apr 2016 18:01:44 +0000 Message-ID: <1461175313-38310-5-git-send-email-wangnan0@huawei.com> X-Mailer: git-send-email 1.8.3.4 In-Reply-To: <1461175313-38310-1-git-send-email-wangnan0@huawei.com> References: <1461175313-38310-1-git-send-email-wangnan0@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.107.193.248] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A090204.5717C425.0053,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2013-05-26 15:14:31, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: d679e5bee2bdefb568508672f832ca5d Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4971 Lines: 165 Following commits will add new types for instance of a bpf program. For kernel bpf program, a program instance is fd. For ubpf program, the instance of a program is a 'struct ubpf_vm'. This patch promote original 'fds' array to 'union prog_instance' array, prepare for further extending. Signed-off-by: Wang Nan Cc: Arnaldo Carvalho de Melo Cc: Alexei Starovoitov Cc: Brendan Gregg Cc: Jiri Olsa Cc: Li Zefan --- tools/lib/bpf/libbpf.c | 44 ++++++++++++++++++++++++-------------------- 1 file changed, 24 insertions(+), 20 deletions(-) diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index 55b739e..dd5a107 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -138,6 +138,10 @@ int libbpf_strerror(int err, char *buf, size_t size) # define LIBBPF_ELF_C_READ_MMAP ELF_C_READ #endif +union prog_instance { + int fd; +}; + /* * bpf_prog should be a better name but it has been used in * linux/filter.h. @@ -157,7 +161,7 @@ struct bpf_program { struct { int nr; - int *fds; + union prog_instance *array; } instances; bpf_program_prep_t preprocessor; @@ -229,14 +233,14 @@ static void bpf_program__unload(struct bpf_program *prog) */ if (prog->instances.nr > 0) { for (i = 0; i < prog->instances.nr; i++) - zclose(prog->instances.fds[i]); + zclose(prog->instances.array[i].fd); } else if (prog->instances.nr != -1) { pr_warning("Internal error: instances.nr is %d\n", prog->instances.nr); } prog->instances.nr = -1; - zfree(&prog->instances.fds); + zfree(&prog->instances.array); } static void bpf_program__exit(struct bpf_program *prog) @@ -287,7 +291,7 @@ bpf_program__init(void *data, size_t size, char *name, int idx, memcpy(prog->insns, data, prog->insns_cnt * sizeof(struct bpf_insn)); prog->idx = idx; - prog->instances.fds = NULL; + prog->instances.array = NULL; prog->instances.nr = -1; return 0; @@ -937,20 +941,20 @@ bpf_program__load(struct bpf_program *prog, { int err = 0, fd, i; - if (prog->instances.nr < 0 || !prog->instances.fds) { + if (prog->instances.nr < 0 || !prog->instances.array) { if (prog->preprocessor) { pr_warning("Internal error: can't load program '%s'\n", prog->section_name); return -LIBBPF_ERRNO__INTERNAL; } - prog->instances.fds = malloc(sizeof(int)); - if (!prog->instances.fds) { - pr_warning("Not enough memory for BPF fds\n"); + prog->instances.array = malloc(sizeof(union prog_instance)); + if (!prog->instances.array) { + pr_warning("Not enough memory for BPF instance\n"); return -ENOMEM; } prog->instances.nr = 1; - prog->instances.fds[0] = -1; + prog->instances.array[0].fd = -1; } if (!prog->preprocessor) { @@ -961,7 +965,7 @@ bpf_program__load(struct bpf_program *prog, err = load_program(prog->insns, prog->insns_cnt, license, kern_version, &fd); if (!err) - prog->instances.fds[0] = fd; + prog->instances.array[0].fd = fd; goto out; } @@ -981,7 +985,7 @@ bpf_program__load(struct bpf_program *prog, if (!result.new_insn_ptr || !result.new_insn_cnt) { pr_debug("Skip loading the %dth instance of program '%s'\n", i, prog->section_name); - prog->instances.fds[i] = -1; + prog->instances.array[i].fd = -1; if (result.pfd) *result.pfd = -1; continue; @@ -999,7 +1003,7 @@ bpf_program__load(struct bpf_program *prog, if (result.pfd) *result.pfd = fd; - prog->instances.fds[i] = fd; + prog->instances.array[i].fd = fd; } out: if (err) @@ -1269,27 +1273,27 @@ int bpf_program__fd(struct bpf_program *prog) int bpf_program__set_prep(struct bpf_program *prog, int nr_instances, bpf_program_prep_t prep) { - int *instances_fds; + union prog_instance *array; if (nr_instances <= 0 || !prep) return -EINVAL; - if (prog->instances.nr > 0 || prog->instances.fds) { + if (prog->instances.nr > 0 || prog->instances.array) { pr_warning("Can't set pre-processor after loading\n"); return -EINVAL; } - instances_fds = malloc(sizeof(int) * nr_instances); - if (!instances_fds) { - pr_warning("alloc memory failed for fds\n"); + array = malloc(sizeof(array[0]) * nr_instances); + if (!array) { + pr_warning("alloc memory failed for instances\n"); return -ENOMEM; } /* fill all fd with -1 */ - memset(instances_fds, -1, sizeof(int) * nr_instances); + memset(array, -1, sizeof(array[0]) * nr_instances); prog->instances.nr = nr_instances; - prog->instances.fds = instances_fds; + prog->instances.array = array; prog->preprocessor = prep; return 0; } @@ -1304,7 +1308,7 @@ int bpf_program__nth_fd(struct bpf_program *prog, int n) return -EINVAL; } - fd = prog->instances.fds[n]; + fd = prog->instances.array[n].fd; if (fd < 0) { pr_warning("%dth instance of program '%s' is invalid\n", n, prog->section_name); -- 1.8.3.4