Alexei Starovoitov 0f8e4bd8a1 bpf: add hashtable type of eBPF maps ... add new map type BPF_MAP_TYPE_HASH and its implementation - maps are created/destroyed by userspace. Both userspace and eBPF programs can lookup/update/delete elements from the map - eBPF programs can be called in_irq(), so use spin_lock_irqsave() mechanism for concurrent updates - key/value are opaque range of bytes (aligned to 8 bytes) - user space provides 3 configuration attributes via BPF syscall: key_size, value_size, max_entries - map takes care of allocating/freeing key/value pairs - map_update_elem() must fail to insert new element when max_entries limit is reached to make sure that eBPF programs cannot exhaust memory - map_update_elem() replaces elements in an atomic way - optimized for speed of lookup() which can be called multiple times from eBPF program which itself is triggered by high volume of events . in the future JIT compiler may recognize lookup() call and optimize it further, since key_size is constant for life of eBPF program Signed-off-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2014-11-18 13:43:25 -05:00
..
core.c	bpf: split eBPF out of NET	2014-10-27 19:09:59 -04:00
hashtab.c	bpf: add hashtable type of eBPF maps	2014-11-18 13:43:25 -05:00
Makefile	bpf: add hashtable type of eBPF maps	2014-11-18 13:43:25 -05:00
syscall.c	bpf: add 'flags' attribute to BPF_MAP_UPDATE_ELEM command	2014-11-18 13:43:25 -05:00
test_stub.c	bpf: mini eBPF library, test stubs and verifier testsuite	2014-09-26 15:05:15 -04:00
verifier.c	bpf: reduce verifier memory consumption	2014-10-30 15:44:37 -04:00