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authorJesper Dangaard Brouer <brouer@redhat.com>2018-01-17 14:05:36 +0300
committerDaniel Borkmann <daniel@iogearbox.net>2018-01-19 00:12:38 +0300
commitcb5f7334d479414adc6afe60105283277e297489 (patch)
tree4f64b36c2ef1d8fa30c74a9bd262a247e33e14c9 /include/uapi/linux/bpf_common.h
parenteefa864a81501161c05b35f14197677c937e5b9a (diff)
downloadlinux-cb5f7334d479414adc6afe60105283277e297489.tar.xz
bpf: add comments to BPF ld/ldx sizes
Doc BPF ld/ldx size defines as comments in code, as it makes in faster to lookup in a programming/review setting, than looking up the sizes in Documentation/networking/filter.txt. Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'include/uapi/linux/bpf_common.h')
-rw-r--r--include/uapi/linux/bpf_common.h7
1 files changed, 4 insertions, 3 deletions
diff --git a/include/uapi/linux/bpf_common.h b/include/uapi/linux/bpf_common.h
index 18be90725ab0..ee97668bdadb 100644
--- a/include/uapi/linux/bpf_common.h
+++ b/include/uapi/linux/bpf_common.h
@@ -15,9 +15,10 @@
/* ld/ldx fields */
#define BPF_SIZE(code) ((code) & 0x18)
-#define BPF_W 0x00
-#define BPF_H 0x08
-#define BPF_B 0x10
+#define BPF_W 0x00 /* 32-bit */
+#define BPF_H 0x08 /* 16-bit */
+#define BPF_B 0x10 /* 8-bit */
+/* eBPF BPF_DW 0x18 64-bit */
#define BPF_MODE(code) ((code) & 0xe0)
#define BPF_IMM 0x00
#define BPF_ABS 0x20