talos-obmc-linux/tools/lib/bpf/libbpf.c, branch dev-4.13

tools lib bpf: improve warning

2017-08-21T02:49:51+00:00

Signed-off-by: Eric Leblond Acked-by: Daniel Borkmann Acked-by: Alexei Starovoitov Signed-off-by: David S. Miller

tools/lib/bpf: expose bpf_program__set_type()

2017-04-01T19:45:57+00:00

expose bpf_program__set_type() to set program type Signed-off-by: Alexei Starovoitov Acked-by: Daniel Borkmann Acked-by: Martin KaFai Lau Signed-off-by: David S. Miller

tools lib bpf: Add bpf_object__pin()

2017-01-31T19:20:06+00:00

Add a new API to pin a BPF object to the filesystem. The user can specify the path within a BPF filesystem to pin the object. Programs will be pinned under a subdirectory named the same as the program, with each instance appearing as a numbered file under that directory, and maps will be pinned under the path using the name of the map as the file basename. For example, with the directory '/sys/fs/bpf/foo' and a BPF object which contains two instances of a program named 'bar', and a map named 'baz': /sys/fs/bpf/foo/bar/0 /sys/fs/bpf/foo/bar/1 /sys/fs/bpf/foo/baz Signed-off-by: Joe Stringer Cc: Alexei Starovoitov Cc: Daniel Borkmann Cc: Wang Nan Cc: netdev@vger.kernel.org Link: http://lkml.kernel.org/r/20170126212001.14103-4-joe@ovn.org [ Check snprintf >= for truncation, as snprintf(bf, size, ...) == size also means truncation ] Signed-off-by: Arnaldo Carvalho de Melo

tools lib bpf: Add bpf_map__pin()

2017-01-31T19:20:06+00:00

Add a new API to pin a BPF map to the filesystem. The user can specify the path full path within a BPF filesystem to pin the map. Signed-off-by: Joe Stringer Cc: Alexei Starovoitov Cc: Daniel Borkmann Cc: Wang Nan Cc: netdev@vger.kernel.org Link: http://lkml.kernel.org/r/20170126212001.14103-3-joe@ovn.org Signed-off-by: Arnaldo Carvalho de Melo

tools lib bpf: Add BPF program pinning APIs

2017-01-31T19:20:05+00:00

Add new APIs to pin a BPF program (or specific instances) to the filesystem. The user can specify the path full path within a BPF filesystem to pin the program. bpf_program__pin_instance(prog, path, n) will pin the nth instance of 'prog' to the specified path. bpf_program__pin(prog, path) will create the directory 'path' (if it does not exist) and pin each instance within that directory. For instance, path/0, path/1, path/2. Committer notes: - Add missing headers for mkdir() - Check strdup() for failure - Check snprintf >= size, not >, as == also means truncated, see 'man snprintf', return value. - Conditionally define BPF_FS_MAGIC, as it isn't in magic.h in older systems and we're not yet having a tools/include/uapi/linux/magic.h copy. - Do not include linux/magic.h, not present in older distros. Signed-off-by: Joe Stringer Cc: Alexei Starovoitov Cc: Daniel Borkmann Cc: Wang Nan Cc: netdev@vger.kernel.org Link: http://lkml.kernel.org/r/20170126212001.14103-2-joe@ovn.org Signed-off-by: Arnaldo Carvalho de Melo

tools lib bpf: Add libbpf_get_error()

2017-01-26T14:42:58+00:00

This function will turn a libbpf pointer into a standard error code (or 0 if the pointer is valid). This also allows removal of the dependency on linux/err.h in the public header file, which causes problems in userspace programs built against libbpf. Signed-off-by: Joe Stringer Acked-by: Wang Nan Cc: Alexei Starovoitov Cc: Daniel Borkmann Cc: netdev@vger.kernel.org Link: http://lkml.kernel.org/r/20170123011128.26534-5-joe@ovn.org Signed-off-by: Arnaldo Carvalho de Melo

tools lib bpf: Add set/is helpers for all prog types

2017-01-26T14:42:58+00:00

These bpf_prog_types were exposed in the uapi but there were no corresponding functions to set these types for programs in libbpf. Signed-off-by: Joe Stringer Acked-by: Wang Nan Cc: Alexei Starovoitov Cc: Daniel Borkmann Cc: netdev@vger.kernel.org Link: http://lkml.kernel.org/r/20170123011128.26534-4-joe@ovn.org Signed-off-by: Arnaldo Carvalho de Melo

tools lib bpf: Define prog_type fns with macro

2017-01-26T14:42:57+00:00

Turning this into a macro allows future prog types to be added with a single line per type. Signed-off-by: Joe Stringer Acked-by: Wang Nan Cc: Alexei Starovoitov Cc: Daniel Borkmann Cc: netdev@vger.kernel.org Link: http://lkml.kernel.org/r/20170123011128.26534-3-joe@ovn.org Signed-off-by: Arnaldo Carvalho de Melo

tools lib bpf: Fix map offsets in relocation

2017-01-26T14:42:56+00:00

Commit 4708bbda5cb2 ("tools lib bpf: Fix maps resolution") attempted to fix map resolution by identifying the number of symbols that point to maps, and using this number to resolve each of the maps. However, during relocation the original definition of the map size was still in use. For up to two maps, the calculation was correct if there was a small difference in size between the map definition in libbpf and the one that the client library uses. However if the difference was large, particularly if more than two maps were used in the BPF program, the relocation would fail. For example, when using a map definition with size 28, with three maps, map relocation would count: (sym_offset / sizeof(struct bpf_map_def) => map_idx) (0 / 16 => 0), ie map_idx = 0 (28 / 16 => 1), ie map_idx = 1 (56 / 16 => 3), ie map_idx = 3 So, libbpf reports: libbpf: bpf relocation: map_idx 3 large than 2 Fix map relocation by checking the exact offset of maps when doing relocation. Signed-off-by: Joe Stringer [Allow different map size in an object] Signed-off-by: Wang Nan Cc: Alexei Starovoitov Cc: Daniel Borkmann Cc: netdev@vger.kernel.org Fixes: 4708bbda5cb2 ("tools lib bpf: Fix maps resolution") Link: http://lkml.kernel.org/r/20170123011128.26534-2-joe@ovn.org Signed-off-by: Arnaldo Carvalho de Melo

tools lib bpf: Add flags to bpf_create_map()

2016-12-15T19:25:47+00:00

Commit 6c905981743 ("bpf: pre-allocate hash map elements") introduces map_flags to bpf_attr for BPF_MAP_CREATE command. Expose this new parameter in libbpf. By exposing it, users can access flags such as whether or not to preallocate the map. Signed-off-by: Joe Stringer Acked-by: Wang Nan Cc: Alexei Starovoitov Cc: Daniel Borkmann Link: http://lkml.kernel.org/r/20161209024620.31660-4-joe@ovn.org [ Added clarifying comment made by Wang Nan ] Signed-off-by: Arnaldo Carvalho de Melo