tools lib bpf: Add missing BPF functions
Add more BPF map operations to libbpf. Also add bpf_obj_{pin,get}(). They can be used on not only BPF maps but also BPF programs. Signed-off-by: Wang Nan <wangnan0@huawei.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Cc: He Kuang <hekuang@huawei.com> Cc: Joe Stringer <joe@ovn.org> Cc: Zefan Li <lizefan@huawei.com> Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/20161126070354.141764-2-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -110,3 +110,59 @@ int bpf_map_update_elem(int fd, void *key, void *value,
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return sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr));
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}
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int bpf_map_lookup_elem(int fd, void *key, void *value)
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{
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union bpf_attr attr;
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bzero(&attr, sizeof(attr));
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attr.map_fd = fd;
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attr.key = ptr_to_u64(key);
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attr.value = ptr_to_u64(value);
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return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));
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}
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int bpf_map_delete_elem(int fd, void *key)
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{
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union bpf_attr attr;
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bzero(&attr, sizeof(attr));
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attr.map_fd = fd;
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attr.key = ptr_to_u64(key);
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return sys_bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr));
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}
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int bpf_map_get_next_key(int fd, void *key, void *next_key)
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{
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union bpf_attr attr;
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bzero(&attr, sizeof(attr));
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attr.map_fd = fd;
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attr.key = ptr_to_u64(key);
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attr.next_key = ptr_to_u64(next_key);
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return sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr));
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}
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int bpf_obj_pin(int fd, const char *pathname)
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{
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union bpf_attr attr;
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bzero(&attr, sizeof(attr));
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attr.pathname = ptr_to_u64((void *)pathname);
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attr.bpf_fd = fd;
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return sys_bpf(BPF_OBJ_PIN, &attr, sizeof(attr));
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}
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int bpf_obj_get(const char *pathname)
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{
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union bpf_attr attr;
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bzero(&attr, sizeof(attr));
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attr.pathname = ptr_to_u64((void *)pathname);
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return sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr));
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}
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@ -35,4 +35,11 @@ int bpf_load_program(enum bpf_prog_type type, struct bpf_insn *insns,
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int bpf_map_update_elem(int fd, void *key, void *value,
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u64 flags);
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int bpf_map_lookup_elem(int fd, void *key, void *value);
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int bpf_map_delete_elem(int fd, void *key);
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int bpf_map_get_next_key(int fd, void *key, void *next_key);
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int bpf_obj_pin(int fd, const char *pathname);
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int bpf_obj_get(const char *pathname);
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#endif
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