diff options
| author |   Daniel Borkmann <daniel@iogearbox.net> | 2015-03-14 02:27:17 +0100 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2015-03-15 21:57:25 -0400 |
| commit | c04167ce2ca0ecaeaafef006cb0d65cf01b68e42 (patch) | |
| tree | ef0c4dc4642696d84bd56c4f409dd32507981bb0 /include | |
| parent | ebpf: add prandom helper for packet sampling (diff) | |
| download | linux-dev-c04167ce2ca0ecaeaafef006cb0d65cf01b68e42.tar.xz linux-dev-c04167ce2ca0ecaeaafef006cb0d65cf01b68e42.zip | |
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/bpf.h | 1 | ||||
| -rw-r--r-- | include/uapi/linux/bpf.h | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/bpf.h b/include/linux/bpf.h index 50bf95e29a96..30bfd331882a 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -155,5 +155,6 @@ extern const struct bpf_func_proto bpf_map_update_elem_proto; extern const struct bpf_func_proto bpf_map_delete_elem_proto; extern const struct bpf_func_proto bpf_get_prandom_u32_proto; +extern const struct bpf_func_proto bpf_get_smp_processor_id_proto; #endif /* _LINUX_BPF_H */ diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 1c2ca2b477c8..de1f63668daf 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -166,6 +166,7 @@ enum bpf_func_id { BPF_FUNC_map_update_elem, /* int map_update_elem(&map, &key, &value, flags) */ BPF_FUNC_map_delete_elem, /* int map_delete_elem(&map, &key) */ BPF_FUNC_get_prandom_u32, /* u32 prandom_u32(void) */ + BPF_FUNC_get_smp_processor_id, /* u32 raw_smp_processor_id(void) */ __BPF_FUNC_MAX_ID, }; |