kernel/linux.git/tools/lib/bpf/libbpf.c, branch v4.10.2

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

tools lib bpf: Retrive bpf_map through offset of bpf_map_def

2016-11-29T15:10:19+00:00

Add a new API to libbpf, caller is able to get bpf_map through the offset of bpf_map_def to 'maps' section. The API will be used to help jitted perf hook code find fd of a map. Signed-off-by: Wang Nan Acked-by: Alexei Starovoitov Cc: He Kuang Cc: Jiri Olsa Cc: Joe Stringer Cc: Zefan Li Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/20161126070354.141764-4-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo

tools lib bpf: Add private field for bpf_object

2016-11-29T15:09:41+00:00

Similar to other classes defined in libbpf.h (map and program), allow 'object' class has its own private data. Signed-off-by: Wang Nan Acked-by: Alexei Starovoitov Cc: He Kuang Cc: Joe Stringer Cc: Zefan Li Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/20161126070354.141764-3-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo

tools lib bpf: Fix maps resolution

2016-11-25T14:27:33+00:00

It is not correct to assimilate the elf data of the maps section to an array of map definition. In fact the sizes differ. The offset provided in the symbol section has to be used instead. This patch fixes a bug causing a elf with two maps not to load correctly. Wang Nan added: This patch requires a name for each BPF map, so array of BPF maps is not allowed. This restriction is reasonable, because kernel verifier forbid indexing BPF map from such array unless the index is a fixed value, but if the index is fixed why not merging it into name? For example: Program like this: ... unsigned long cpu = get_smp_processor_id(); int *pval = map_lookup_elem(&map_array[cpu], &key); ... Generates bytecode like this: 0: (b7) r1 = 0 1: (63) *(u32 *)(r10 -4) = r1 2: (b7) r1 = 680997 3: (63) *(u32 *)(r10 -8) = r1 4: (85) call 8 5: (67) r0 <<= 4 6: (18) r1 = 0x112dd000 8: (0f) r0 += r1 9: (bf) r2 = r10 10: (07) r2 += -4 11: (bf) r1 = r0 12: (85) call 1 Where instruction 8 is the computation, 8 and 11 render r1 to an invalid value for function map_lookup_elem, causes verifier report error. Signed-off-by: Eric Leblond Cc: Alexei Starovoitov Cc: He Kuang Cc: Wang Nan [ Merge bpf_object__init_maps_name into bpf_object__init_maps. Fix segfault for buggy BPF script Validate obj->maps ] Cc: Zefan Li Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/20161115040617.69788-5-wangnan0@huawei.com Signed-off-by: Wang Nan Signed-off-by: Arnaldo Carvalho de Melo

tools lib bpf: Use official ELF e_machine value

2016-07-26T13:08:53+00:00

New LLVM will issue newly assigned EM_BPF machine code. The new code will be propagated to glibc and libelf. This patch introduces the new machine code to libbpf. Signed-off-by: Wang Nan Acked-by: Alexei Starovoitov Cc: Zefan Li Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1468821668-60088-1-git-send-email-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo

tools lib bpf: Report error when kernel doesn't support program type

2016-07-14T02:09:02+00:00

Now libbpf support tracepoint program type. Report meaningful error when kernel version is less than 4.7. Signed-off-by: Wang Nan Cc: Alexei Starovoitov Cc: Jiri Olsa Cc: Zefan Li Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1468406646-21642-3-git-send-email-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo

tools lib bpf: New API to adjust type of a BPF program

2016-07-14T02:09:02+00:00

Add 4 new APIs to adjust and query the type of a BPF program. Load program according to type set by caller. Default is set to BPF_PROG_TYPE_KPROBE. Signed-off-by: Wang Nan Cc: Alexei Starovoitov Cc: Jiri Olsa Cc: Zefan Li Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1468406646-21642-2-git-send-email-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo

tools lib bpf: Add license header

2016-07-04T23:27:25+00:00

Adding a missing license descriptopn header to files in libbpf, make it LGPL-2.1. Signed-off-by: Wang Nan Cc: Alexei Starovoitov Cc: Daniel Borkmann Cc: Eric Leblond Cc: Zefan Li Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1467630162-193121-1-git-send-email-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo

tools lib bpf: Fix spelling mistake: "missmatch" -> "mismatch"

2016-06-29T13:07:34+00:00

Trivial fix to spelling mistake Signed-off-by: Colin King Acked-by: Wang Nan Cc: Alexei Starovoitov Cc: He Kuang Cc: Namhyung Kim Link: http://lkml.kernel.org/r/1467116617-8318-1-git-send-email-colin.king@canonical.com Signed-off-by: Arnaldo Carvalho de Melo

tools lib bpf: Rename set_private() to set_priv()

2016-06-06T21:19:49+00:00

For consistency with class__priv() elsewhere, and with the callback typedef for clearing those areas (e.g. bpf_map_clear_priv_t). Acked-by: Wang Nan Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Milian Wolff Cc: Namhyung Kim Link: http://lkml.kernel.org/n/tip-rnbiyv27ohw8xppsgx0el3xb@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo