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Daniel Borkmann c04167ce2c ebpf: add helper for obtaining current processor id 
This patch adds the possibility to obtain raw_smp_processor_id() in
eBPF. Currently, this is only possible in classic BPF where commit
da2033c282 ("filter: add SKF_AD_RXHASH and SKF_AD_CPU") has added
facilities for this.

Perhaps most importantly, this would also allow us to track per CPU
statistics with eBPF maps, or to implement a poor-man's per CPU data
structure through eBPF maps.

Example function proto-type looks like:

  u32 (*smp_processor_id)(void) = (void *)BPF_FUNC_get_smp_processor_id;

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2015-03-15 21:57:25 -04:00
..
Makefile ebpf: remove kernel test stubs 2015-03-01 14:05:18 -05:00
arraymap.c ebpf: constify various function pointer structs 2015-03-01 14:05:18 -05:00
core.c ebpf: add helper for obtaining current processor id 2015-03-15 21:57:25 -04:00
hashtab.c ebpf: constify various function pointer structs 2015-03-01 14:05:18 -05:00
helpers.c ebpf: add helper for obtaining current processor id 2015-03-15 21:57:25 -04:00
syscall.c cls_bpf: add initial eBPF support for programmable classifiers 2015-03-01 14:05:19 -05:00
verifier.c ebpf: verifier: check that call reg with ARG_ANYTHING is initialized 2015-03-12 15:29:31 -04:00