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authorAlexei Starovoitov <ast@plumgrid.com>2014-09-26 00:16:59 -0700
committerDavid S. Miller <davem@davemloft.net>2014-09-26 15:05:14 -0400
commitdb20fd2b01087bdfbe30bce314a198eefedcc42e (patch)
treec43a4e3edb46deae542c8e79d74d24703ffbdcca /kernel/bpf/core.c
parent749730ce42a2121e1c88350d69478bff3994b10a (diff)
downloadlinux-sh-db20fd2b01087bdfbe30bce314a198eefedcc42e.tar.gz
bpf: add lookup/update/delete/iterate methods to BPF maps
'maps' is a generic storage of different types for sharing data between kernel and userspace. The maps are accessed from user space via BPF syscall, which has commands: - create a map with given type and attributes fd = bpf(BPF_MAP_CREATE, union bpf_attr *attr, u32 size) returns fd or negative error - lookup key in a given map referenced by fd err = bpf(BPF_MAP_LOOKUP_ELEM, union bpf_attr *attr, u32 size) using attr->map_fd, attr->key, attr->value returns zero and stores found elem into value or negative error - create or update key/value pair in a given map err = bpf(BPF_MAP_UPDATE_ELEM, union bpf_attr *attr, u32 size) using attr->map_fd, attr->key, attr->value returns zero or negative error - find and delete element by key in a given map err = bpf(BPF_MAP_DELETE_ELEM, union bpf_attr *attr, u32 size) using attr->map_fd, attr->key - iterate map elements (based on input key return next_key) err = bpf(BPF_MAP_GET_NEXT_KEY, union bpf_attr *attr, u32 size) using attr->map_fd, attr->key, attr->next_key - close(fd) deletes the map Signed-off-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel/bpf/core.c')
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