diff mbox series

[v3,bpf-next,3/4] libbpf: add opts-based bpf_obj_pin() API and add support for path_fd

Message ID 20230522232917.2454595-4-andrii@kernel.org (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series Add O_PATH-based BPF_OBJ_PIN and BPF_OBJ_GET support | expand

Checks

Context Check Description
bpf/vmtest-bpf-next-PR success PR summary
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bpf/vmtest-bpf-next-VM_Test-3 success Logs for build for s390x with gcc
bpf/vmtest-bpf-next-VM_Test-7 success Logs for test_maps on aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-9 success Logs for test_maps on x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-10 success Logs for test_maps on x86_64 with llvm-16
bpf/vmtest-bpf-next-VM_Test-19 success Logs for test_progs_no_alu32_parallel on aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-20 success Logs for test_progs_no_alu32_parallel on x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-21 success Logs for test_progs_no_alu32_parallel on x86_64 with llvm-16
bpf/vmtest-bpf-next-VM_Test-22 success Logs for test_progs_parallel on aarch64 with gcc
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bpf/vmtest-bpf-next-VM_Test-24 success Logs for test_progs_parallel on x86_64 with llvm-16
bpf/vmtest-bpf-next-VM_Test-25 success Logs for test_verifier on aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-26 success Logs for test_verifier on s390x with gcc
bpf/vmtest-bpf-next-VM_Test-27 success Logs for test_verifier on x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-28 success Logs for test_verifier on x86_64 with llvm-16
bpf/vmtest-bpf-next-VM_Test-29 success Logs for veristat
bpf/vmtest-bpf-next-VM_Test-11 success Logs for test_progs on aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-13 success Logs for test_progs on x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-14 success Logs for test_progs on x86_64 with llvm-16
bpf/vmtest-bpf-next-VM_Test-15 success Logs for test_progs_no_alu32 on aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-17 fail Logs for test_progs_no_alu32 on x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-18 success Logs for test_progs_no_alu32 on x86_64 with llvm-16
bpf/vmtest-bpf-next-VM_Test-16 success Logs for test_progs_no_alu32 on s390x with gcc
bpf/vmtest-bpf-next-VM_Test-12 success Logs for test_progs on s390x with gcc
bpf/vmtest-bpf-next-VM_Test-8 success Logs for test_maps on s390x with gcc
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 8 this patch: 8
netdev/cc_maintainers warning 8 maintainers not CCed: yhs@fb.com kpsingh@kernel.org martin.lau@linux.dev john.fastabend@gmail.com song@kernel.org sdf@google.com jolsa@kernel.org haoluo@google.com
netdev/build_clang success Errors and warnings before: 8 this patch: 8
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 8 this patch: 8
netdev/checkpatch fail CHECK: Please use a blank line after function/struct/union/enum declarations ERROR: space prohibited before that ':' (ctx:WxV) WARNING: line length of 87 exceeds 80 columns
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Commit Message

Andrii Nakryiko May 22, 2023, 11:29 p.m. UTC 
Add path_fd support for bpf_obj_pin() and bpf_obj_get() operations
(through their opts-based variants). This allows to take advantage of
new kernel-side support for O_PATH-based pin/get location specification.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
---
 tools/lib/bpf/bpf.c      | 17 ++++++++++++++---
 tools/lib/bpf/bpf.h      | 18 ++++++++++++++++--
 tools/lib/bpf/libbpf.map |  1 +
 3 files changed, 31 insertions(+), 5 deletions(-)

Comments

Daniel Borkmann May 23, 2023, 2:38 p.m. UTC | #1 
On 5/23/23 1:29 AM, Andrii Nakryiko wrote:
[...]
> diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
> index a5aa3a383d69..7a4fe80da360 100644
> --- a/tools/lib/bpf/libbpf.map
> +++ b/tools/lib/bpf/libbpf.map
> @@ -389,5 +389,6 @@ LIBBPF_1.2.0 {
>   		bpf_link__update_map;
>   		bpf_link_get_info_by_fd;
>   		bpf_map_get_info_by_fd;
> +		bpf_obj_pin_opts;

Given 1.2.0 went out [0], shouldn't this go into a new LIBBPF_1.3.0 section?

>   		bpf_prog_get_info_by_fd;
>   } LIBBPF_1.1.0;

Thanks,
Daniel

   [0] https://lore.kernel.org/bpf/CAEf4BzYJhzEDHarRGvidhPd-DRtu4VXxnQ=HhOG-LZjkbK-MwQ@mail.gmail.com/
Andrii Nakryiko May 23, 2023, 4:21 p.m. UTC | #2 
On Tue, May 23, 2023 at 7:38 AM Daniel Borkmann <daniel@iogearbox.net> wrote:
>
> On 5/23/23 1:29 AM, Andrii Nakryiko wrote:
> [...]
> > diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
> > index a5aa3a383d69..7a4fe80da360 100644
> > --- a/tools/lib/bpf/libbpf.map
> > +++ b/tools/lib/bpf/libbpf.map
> > @@ -389,5 +389,6 @@ LIBBPF_1.2.0 {
> >               bpf_link__update_map;
> >               bpf_link_get_info_by_fd;
> >               bpf_map_get_info_by_fd;
> > +             bpf_obj_pin_opts;
>
> Given 1.2.0 went out [0], shouldn't this go into a new LIBBPF_1.3.0 section?

yep, you are right, this should have gone into a new 1.3.0 sections.
I'll add "starting v1.3 dev cycle" patch into v4 and resend.

>
> >               bpf_prog_get_info_by_fd;
> >   } LIBBPF_1.1.0;
>
> Thanks,
> Daniel
>
>    [0] https://lore.kernel.org/bpf/CAEf4BzYJhzEDHarRGvidhPd-DRtu4VXxnQ=HhOG-LZjkbK-MwQ@mail.gmail.com/
>
diff mbox series

Patch

diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
index 128ac723c4ea..ed86b37d8024 100644
--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c
@@ -572,20 +572,30 @@  int bpf_map_update_batch(int fd, const void *keys, const void *values, __u32 *co
 				    (void *)keys, (void *)values, count, opts);
 }
 
-int bpf_obj_pin(int fd, const char *pathname)
+int bpf_obj_pin_opts(int fd, const char *pathname, const struct bpf_obj_pin_opts *opts)
 {
-	const size_t attr_sz = offsetofend(union bpf_attr, file_flags);
+	const size_t attr_sz = offsetofend(union bpf_attr, path_fd);
 	union bpf_attr attr;
 	int ret;
 
+	if (!OPTS_VALID(opts, bpf_obj_pin_opts))
+		return libbpf_err(-EINVAL);
+
 	memset(&attr, 0, attr_sz);
+	attr.path_fd = OPTS_GET(opts, path_fd, 0);
 	attr.pathname = ptr_to_u64((void *)pathname);
+	attr.file_flags = OPTS_GET(opts, file_flags, 0);
 	attr.bpf_fd = fd;
 
 	ret = sys_bpf(BPF_OBJ_PIN, &attr, attr_sz);
 	return libbpf_err_errno(ret);
 }
 
+int bpf_obj_pin(int fd, const char *pathname)
+{
+	return bpf_obj_pin_opts(fd, pathname, NULL);
+}
+
 int bpf_obj_get(const char *pathname)
 {
 	return bpf_obj_get_opts(pathname, NULL);
@@ -593,7 +603,7 @@  int bpf_obj_get(const char *pathname)
 
 int bpf_obj_get_opts(const char *pathname, const struct bpf_obj_get_opts *opts)
 {
-	const size_t attr_sz = offsetofend(union bpf_attr, file_flags);
+	const size_t attr_sz = offsetofend(union bpf_attr, path_fd);
 	union bpf_attr attr;
 	int fd;
 
@@ -601,6 +611,7 @@  int bpf_obj_get_opts(const char *pathname, const struct bpf_obj_get_opts *opts)
 		return libbpf_err(-EINVAL);
 
 	memset(&attr, 0, attr_sz);
+	attr.path_fd = OPTS_GET(opts, path_fd, 0);
 	attr.pathname = ptr_to_u64((void *)pathname);
 	attr.file_flags = OPTS_GET(opts, file_flags, 0);
 
diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h
index a2c091389b18..9aa0ee473754 100644
--- a/tools/lib/bpf/bpf.h
+++ b/tools/lib/bpf/bpf.h
@@ -284,16 +284,30 @@  LIBBPF_API int bpf_map_update_batch(int fd, const void *keys, const void *values
 				    __u32 *count,
 				    const struct bpf_map_batch_opts *opts);
 
-struct bpf_obj_get_opts {
+struct bpf_obj_pin_opts {
 	size_t sz; /* size of this struct for forward/backward compatibility */
 
 	__u32 file_flags;
+	int path_fd;
 
 	size_t :0;
 };
-#define bpf_obj_get_opts__last_field file_flags
+#define bpf_obj_pin_opts__last_field path_fd
 
 LIBBPF_API int bpf_obj_pin(int fd, const char *pathname);
+LIBBPF_API int bpf_obj_pin_opts(int fd, const char *pathname,
+				const struct bpf_obj_pin_opts *opts);
+
+struct bpf_obj_get_opts {
+	size_t sz; /* size of this struct for forward/backward compatibility */
+
+	__u32 file_flags;
+	int path_fd;
+
+	size_t :0;
+};
+#define bpf_obj_get_opts__last_field path_fd
+
 LIBBPF_API int bpf_obj_get(const char *pathname);
 LIBBPF_API int bpf_obj_get_opts(const char *pathname,
 				const struct bpf_obj_get_opts *opts);
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index a5aa3a383d69..7a4fe80da360 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -389,5 +389,6 @@  LIBBPF_1.2.0 {
 		bpf_link__update_map;
 		bpf_link_get_info_by_fd;
 		bpf_map_get_info_by_fd;
+		bpf_obj_pin_opts;
 		bpf_prog_get_info_by_fd;
 } LIBBPF_1.1.0;