From: Andrii Nakryiko andrii@kernel.org
mainline inclusion from mainline-5.13-rc1 commit c41226654550b0a8aa75e91ce0a1cdb6ce2316ee category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I5EUVD CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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Add optional name OBJECT_NAME parameter to `gen skeleton` command to override default object name, normally derived from input file name. This allows much more flexibility during build time.
Signed-off-by: Andrii Nakryiko andrii@kernel.org Signed-off-by: Alexei Starovoitov ast@kernel.org Link: https://lore.kernel.org/bpf/20210318194036.3521577-9-andrii@kernel.org (cherry picked from commit c41226654550b0a8aa75e91ce0a1cdb6ce2316ee) Signed-off-by: Wang Yufen wangyufen@huawei.com --- .../bpf/bpftool/Documentation/bpftool-gen.rst | 13 +++++---- tools/bpf/bpftool/bash-completion/bpftool | 11 ++++++- tools/bpf/bpftool/gen.c | 29 +++++++++++++++++-- 3 files changed, 44 insertions(+), 9 deletions(-)
diff --git a/tools/bpf/bpftool/Documentation/bpftool-gen.rst b/tools/bpf/bpftool/Documentation/bpftool-gen.rst index 84cf0639696f..d4e7338e22e7 100644 --- a/tools/bpf/bpftool/Documentation/bpftool-gen.rst +++ b/tools/bpf/bpftool/Documentation/bpftool-gen.rst @@ -19,7 +19,7 @@ SYNOPSIS GEN COMMANDS =============
-| **bpftool** **gen skeleton** *FILE* +| **bpftool** **gen skeleton** *FILE* [**name** *OBJECT_NAME*] | **bpftool** **gen help**
DESCRIPTION @@ -75,10 +75,13 @@ DESCRIPTION specific maps, programs, etc.
As part of skeleton, few custom functions are generated. - Each of them is prefixed with object name, derived from - object file name. I.e., if BPF object file name is - **example.o**, BPF object name will be **example**. The - following custom functions are provided in such case: + Each of them is prefixed with object name. Object name can + either be derived from object file name, i.e., if BPF object + file name is **example.o**, BPF object name will be + **example**. Object name can be also specified explicitly + through **name** *OBJECT_NAME* parameter. The following + custom functions are provided (assuming **example** as + the object name):
- **example__open** and **example__open_opts**. These functions are used to instantiate skeleton. It diff --git a/tools/bpf/bpftool/bash-completion/bpftool b/tools/bpf/bpftool/bash-completion/bpftool index f783e7c5a8df..5590f6209e3d 100644 --- a/tools/bpf/bpftool/bash-completion/bpftool +++ b/tools/bpf/bpftool/bash-completion/bpftool @@ -982,7 +982,16 @@ _bpftool() gen) case $command in skeleton) - _filedir + case $prev in + $command) + _filedir + return 0 + ;; + *) + _bpftool_once_attr 'name' + return 0 + ;; + esac ;; *) [[ $prev == $object ]] && \ diff --git a/tools/bpf/bpftool/gen.c b/tools/bpf/bpftool/gen.c index 4033c46d83e7..9bff89a66835 100644 --- a/tools/bpf/bpftool/gen.c +++ b/tools/bpf/bpftool/gen.c @@ -273,7 +273,7 @@ static int do_skeleton(int argc, char **argv) char header_guard[MAX_OBJ_NAME_LEN + sizeof("__SKEL_H__")]; size_t i, map_cnt = 0, prog_cnt = 0, file_sz, mmap_sz; DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts); - char obj_name[MAX_OBJ_NAME_LEN], *obj_data; + char obj_name[MAX_OBJ_NAME_LEN] = "", *obj_data; struct bpf_object *obj = NULL; const char *file, *ident; struct bpf_program *prog; @@ -288,6 +288,28 @@ static int do_skeleton(int argc, char **argv) } file = GET_ARG();
+ while (argc) { + if (!REQ_ARGS(2)) + return -1; + + if (is_prefix(*argv, "name")) { + NEXT_ARG(); + + if (obj_name[0] != '\0') { + p_err("object name already specified"); + return -1; + } + + strncpy(obj_name, *argv, MAX_OBJ_NAME_LEN - 1); + obj_name[MAX_OBJ_NAME_LEN - 1] = '\0'; + } else { + p_err("unknown arg %s", *argv); + return -1; + } + + NEXT_ARG(); + } + if (argc) { p_err("extra unknown arguments"); return -1; @@ -310,7 +332,8 @@ static int do_skeleton(int argc, char **argv) p_err("failed to mmap() %s: %s", file, strerror(errno)); goto out; } - get_obj_name(obj_name, file); + if (obj_name[0] == '\0') + get_obj_name(obj_name, file); opts.object_name = obj_name; obj = bpf_object__open_mem(obj_data, file_sz, &opts); if (IS_ERR(obj)) { @@ -599,7 +622,7 @@ static int do_help(int argc, char **argv) }
fprintf(stderr, - "Usage: %1$s %2$s skeleton FILE\n" + "Usage: %1$s %2$s skeleton FILE [name OBJECT_NAME]\n" " %1$s %2$s help\n" "\n" " " HELP_SPEC_OPTIONS "\n"