From: Stanislav Fomichev sdf@google.com
This patch adds new *loadall* command which slightly differs from the existing *load*. *load* command loads all programs from the obj file, but pins only the first programs. *loadall* pins all programs from the obj file under specified directory.
The intended usecase is flow_dissector, where we want to load a bunch of progs, pin them all and after that construct a jump table.
Signed-off-by: Stanislav Fomichev sdf@google.com --- .../bpftool/Documentation/bpftool-prog.rst | 14 +++- tools/bpf/bpftool/bash-completion/bpftool | 4 +- tools/bpf/bpftool/common.c | 31 ++++---- tools/bpf/bpftool/main.h | 1 + tools/bpf/bpftool/prog.c | 74 ++++++++++++++----- 5 files changed, 82 insertions(+), 42 deletions(-)
diff --git a/tools/bpf/bpftool/Documentation/bpftool-prog.rst b/tools/bpf/bpftool/Documentation/bpftool-prog.rst index ac4e904b10fb..d943d9b67a1d 100644 --- a/tools/bpf/bpftool/Documentation/bpftool-prog.rst +++ b/tools/bpf/bpftool/Documentation/bpftool-prog.rst @@ -15,7 +15,8 @@ SYNOPSIS *OPTIONS* := { { **-j** | **--json** } [{ **-p** | **--pretty** }] | { **-f** | **--bpffs** } }
*COMMANDS* := - { **show** | **list** | **dump xlated** | **dump jited** | **pin** | **load** | **help** } + { **show** | **list** | **dump xlated** | **dump jited** | **pin** | **load** + | **loadall** | **help** }
MAP COMMANDS ============= @@ -24,7 +25,7 @@ MAP COMMANDS | **bpftool** **prog dump xlated** *PROG* [{**file** *FILE* | **opcodes** | **visual**}] | **bpftool** **prog dump jited** *PROG* [{**file** *FILE* | **opcodes**}] | **bpftool** **prog pin** *PROG* *FILE* -| **bpftool** **prog load** *OBJ* *FILE* [**type** *TYPE*] [**map** {**idx** *IDX* | **name** *NAME*} *MAP*] [**dev** *NAME*] +| **bpftool** **prog { load | loadall }** *OBJ* *FILE* [**type** *TYPE*] [**map** {**idx** *IDX* | **name** *NAME*} *MAP*] [**dev** *NAME*] | **bpftool** **prog attach** *PROG* *ATTACH_TYPE* *MAP* | **bpftool** **prog detach** *PROG* *ATTACH_TYPE* *MAP* | **bpftool** **prog help** @@ -79,8 +80,13 @@ DESCRIPTION contain a dot character ('.'), which is reserved for future extensions of *bpffs*.
- **bpftool prog load** *OBJ* *FILE* [**type** *TYPE*] [**map** {**idx** *IDX* | **name** *NAME*} *MAP*] [**dev** *NAME*] - Load bpf program from binary *OBJ* and pin as *FILE*. + **bpftool prog { load | loadall }** *OBJ* *FILE* [**type** *TYPE*] [**map** {**idx** *IDX* | **name** *NAME*} *MAP*] [**dev** *NAME*] + Load bpf program(s) from binary *OBJ* and pin as *FILE*. + Both **bpftool prog load** and **bpftool prog loadall** load + all maps and programs from the *OBJ* and differ only in + pinning. **load** pins only the first program from the *OBJ* + as *FILE*. **loadall** pins all programs from the *OBJ* + under *FILE* directory. **type** is optional, if not specified program type will be inferred from section names. By default bpftool will create new maps as declared in the ELF diff --git a/tools/bpf/bpftool/bash-completion/bpftool b/tools/bpf/bpftool/bash-completion/bpftool index 3f78e6404589..780ebafb756a 100644 --- a/tools/bpf/bpftool/bash-completion/bpftool +++ b/tools/bpf/bpftool/bash-completion/bpftool @@ -243,7 +243,7 @@ _bpftool() # Completion depends on object and command in use case $object in prog) - if [[ $command != "load" ]]; then + if [[ $command != "load" && $command != "loadall" ]]; then case $prev in id) _bpftool_get_prog_ids @@ -309,7 +309,7 @@ _bpftool() fi return 0 ;; - load) + load|loadall) local obj
if [[ ${#words[@]} -lt 6 ]]; then diff --git a/tools/bpf/bpftool/common.c b/tools/bpf/bpftool/common.c index 25af85304ebe..21ce556c15e1 100644 --- a/tools/bpf/bpftool/common.c +++ b/tools/bpf/bpftool/common.c @@ -169,34 +169,23 @@ int open_obj_pinned_any(char *path, enum bpf_obj_type exp_type) return fd; }
-int do_pin_fd(int fd, const char *name) +int mount_bpffs_for_pin(const char *name) { char err_str[ERR_MAX_LEN]; char *file; char *dir; int err = 0;
- err = bpf_obj_pin(fd, name); - if (!err) - goto out; - file = malloc(strlen(name) + 1); strcpy(file, name); dir = dirname(file);
- if (errno != EPERM || is_bpffs(dir)) { - p_err("can't pin the object (%s): %s", name, strerror(errno)); + if (is_bpffs(dir)) + /* nothing to do if already mounted */ goto out_free; - }
- /* Attempt to mount bpffs, then retry pinning. */ err = mnt_bpffs(dir, err_str, ERR_MAX_LEN); - if (!err) { - err = bpf_obj_pin(fd, name); - if (err) - p_err("can't pin the object (%s): %s", name, - strerror(errno)); - } else { + if (err) { err_str[ERR_MAX_LEN - 1] = '\0'; p_err("can't mount BPF file system to pin the object (%s): %s", name, err_str); @@ -204,10 +193,20 @@ int do_pin_fd(int fd, const char *name)
out_free: free(file); -out: return err; }
+int do_pin_fd(int fd, const char *name) +{ + int err; + + err = mount_bpffs_for_pin(name); + if (err) + return err; + + return bpf_obj_pin(fd, name); +} + int do_pin_any(int argc, char **argv, int (*get_fd_by_id)(__u32)) { unsigned int id; diff --git a/tools/bpf/bpftool/main.h b/tools/bpf/bpftool/main.h index 28322ace2856..1383824c9baf 100644 --- a/tools/bpf/bpftool/main.h +++ b/tools/bpf/bpftool/main.h @@ -129,6 +129,7 @@ const char *get_fd_type_name(enum bpf_obj_type type); char *get_fdinfo(int fd, const char *key); int open_obj_pinned(char *path); int open_obj_pinned_any(char *path, enum bpf_obj_type exp_type); +int mount_bpffs_for_pin(const char *name); int do_pin_any(int argc, char **argv, int (*get_fd_by_id)(__u32)); int do_pin_fd(int fd, const char *name);
diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c index 5302ee282409..751a90ccfdab 100644 --- a/tools/bpf/bpftool/prog.c +++ b/tools/bpf/bpftool/prog.c @@ -792,15 +792,16 @@ static int do_detach(int argc, char **argv) jsonw_null(json_wtr); return 0; } -static int do_load(int argc, char **argv) + +static int load_with_options(int argc, char **argv, bool first_prog_only) { enum bpf_attach_type expected_attach_type; struct bpf_object_open_attr attr = { .prog_type = BPF_PROG_TYPE_UNSPEC, }; struct map_replace *map_replace = NULL; + struct bpf_program *prog = NULL, *pos; unsigned int old_map_fds = 0; - struct bpf_program *prog; struct bpf_object *obj; struct bpf_map *map; const char *pinfile; @@ -918,26 +919,25 @@ static int do_load(int argc, char **argv) goto err_free_reuse_maps; }
- prog = bpf_program__next(NULL, obj); - if (!prog) { - p_err("object file doesn't contain any bpf program"); - goto err_close_obj; - } + bpf_object__for_each_program(pos, obj) { + enum bpf_prog_type prog_type = attr.prog_type;
- bpf_program__set_ifindex(prog, ifindex); - if (attr.prog_type == BPF_PROG_TYPE_UNSPEC) { - const char *sec_name = bpf_program__title(prog, false); + if (attr.prog_type == BPF_PROG_TYPE_UNSPEC) { + const char *sec_name = bpf_program__title(pos, false);
- err = libbpf_prog_type_by_name(sec_name, &attr.prog_type, - &expected_attach_type); - if (err < 0) { - p_err("failed to guess program type based on section name %s\n", - sec_name); - goto err_close_obj; + err = libbpf_prog_type_by_name(sec_name, &prog_type, + &expected_attach_type); + if (err < 0) { + p_err("failed to guess program type based on section name %s\n", + sec_name); + goto err_close_obj; + } } + + bpf_program__set_ifindex(pos, ifindex); + bpf_program__set_type(pos, prog_type); + bpf_program__set_expected_attach_type(pos, expected_attach_type); } - bpf_program__set_type(prog, attr.prog_type); - bpf_program__set_expected_attach_type(prog, expected_attach_type);
qsort(map_replace, old_map_fds, sizeof(*map_replace), map_replace_compar); @@ -1001,9 +1001,31 @@ static int do_load(int argc, char **argv) goto err_close_obj; }
- if (do_pin_fd(bpf_program__fd(prog), pinfile)) + err = mount_bpffs_for_pin(pinfile); + if (err) goto err_close_obj;
+ if (first_prog_only) { + prog = bpf_program__next(NULL, obj); + if (!prog) { + p_err("object file doesn't contain any bpf program"); + goto err_close_obj; + } + + err = bpf_obj_pin(bpf_program__fd(prog), pinfile); + if (err) { + p_err("failed to pin program %s", + bpf_program__title(prog, false)); + goto err_close_obj; + } + } else { + err = bpf_object__pin_programs(obj, pinfile); + if (err) { + p_err("failed to pin all programs"); + goto err_close_obj; + } + } + if (json_output) jsonw_null(json_wtr);
@@ -1023,6 +1045,16 @@ static int do_load(int argc, char **argv) return -1; }
+static int do_load(int argc, char **argv) +{ + return load_with_options(argc, argv, true); +} + +static int do_loadall(int argc, char **argv) +{ + return load_with_options(argc, argv, false); +} + static int do_help(int argc, char **argv) { if (json_output) { @@ -1035,7 +1067,8 @@ static int do_help(int argc, char **argv) " %s %s dump xlated PROG [{ file FILE | opcodes | visual }]\n" " %s %s dump jited PROG [{ file FILE | opcodes }]\n" " %s %s pin PROG FILE\n" - " %s %s load OBJ FILE [type TYPE] [dev NAME] \\n" + " %s %s { load | loadall } OBJ FILE \\n" + " [type TYPE] [dev NAME] \\n" " [map { idx IDX | name NAME } MAP]\n" " %s %s attach PROG ATTACH_TYPE MAP\n" " %s %s detach PROG ATTACH_TYPE MAP\n" @@ -1067,6 +1100,7 @@ static const struct cmd cmds[] = { { "dump", do_dump }, { "pin", do_pin }, { "load", do_load }, + { "loadall", do_loadall }, { "attach", do_attach }, { "detach", do_detach }, { 0 }