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| author | Alexei Starovoitov <ast@plumgrid.com> | 2014-10-23 18:41:08 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-10-27 19:09:59 -0400 |
| commit | f89b7755f517cdbb755d7543eef986ee9d54e654 (patch) | |
| tree | bf491bea6418b0442900d864237e0028f7c35162 /init | |
| parent | 8ae3c911b9efcca653c552a9c74957a6cb04a87d (diff) | |
| download | lwn-f89b7755f517cdbb755d7543eef986ee9d54e654.tar.gz lwn-f89b7755f517cdbb755d7543eef986ee9d54e654.zip | |
bpf: split eBPF out of NET
introduce two configs:
- hidden CONFIG_BPF to select eBPF interpreter that classic socket filters
depend on
- visible CONFIG_BPF_SYSCALL (default off) that tracing and sockets can use
that solves several problems:
- tracing and others that wish to use eBPF don't need to depend on NET.
They can use BPF_SYSCALL to allow loading from userspace or select BPF
to use it directly from kernel in NET-less configs.
- in 3.18 programs cannot be attached to events yet, so don't force it on
- when the rest of eBPF infra is there in 3.19+, it's still useful to
switch it off to minimize kernel size
bloat-o-meter on x64 shows:
add/remove: 0/60 grow/shrink: 0/2 up/down: 0/-15601 (-15601)
tested with many different config combinations. Hopefully didn't miss anything.
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Acked-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig index 3ee28ae02cc8..2081a4d3d917 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1341,6 +1341,10 @@ config SYSCTL_ARCH_UNALIGN_ALLOW config HAVE_PCSPKR_PLATFORM bool +# interpreter that classic socket filters depend on +config BPF + bool + menuconfig EXPERT bool "Configure standard kernel features (expert users)" # Unhide debug options, to make the on-by-default options visible @@ -1521,6 +1525,16 @@ config EVENTFD If unsure, say Y. +# syscall, maps, verifier +config BPF_SYSCALL + bool "Enable bpf() system call" if EXPERT + select ANON_INODES + select BPF + default n + help + Enable the bpf() system call that allows to manipulate eBPF + programs and maps via file descriptors. + config SHMEM bool "Use full shmem filesystem" if EXPERT default y |