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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>
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@ -17,7 +17,7 @@
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#define BPF_ALU64 0x07 /* alu mode in double word width */
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/* ld/ldx fields */
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#define BPF_DW 0x18 /* double word */
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#define BPF_DW 0x18 /* double word (64-bit) */
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#define BPF_XADD 0xc0 /* exclusive add */
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/* alu/jmp fields */
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@ -15,9 +15,10 @@
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/* ld/ldx fields */
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#define BPF_SIZE(code) ((code) & 0x18)
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#define BPF_W 0x00
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#define BPF_H 0x08
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#define BPF_B 0x10
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#define BPF_W 0x00 /* 32-bit */
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#define BPF_H 0x08 /* 16-bit */
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#define BPF_B 0x10 /* 8-bit */
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/* eBPF BPF_DW 0x18 64-bit */
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#define BPF_MODE(code) ((code) & 0xe0)
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#define BPF_IMM 0x00
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#define BPF_ABS 0x20
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