| commit | c04167ce2ca0ecaeaafef006cb0d65cf01b68e42 | |
| author | Daniel Borkmann <daniel@iogearbox.net> | |
| Sat, 14 Mar 2015 01:27:17 +0000 (14 02:27 +0100) | ||
| committer | David S. Miller <davem@davemloft.net> | |
| Mon, 16 Mar 2015 01:57:25 +0000 (15 21:57 -0400) | ||
| tree | ef0c4dc4642696d84bd56c4f409dd32507981bb0 | treesnapshot (tar.gz zip) |
| parent | 03e69b508b6f7c51743055c9f61d1dfeadf4b635 | commitdiff |
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
da2033c28226 ("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>
This patch adds the possibility to obtain raw_smp_processor_id() in
eBPF. Currently, this is only possible in classic BPF where commit
da2033c28226 ("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>