Hi Yonghong. This is from the v4 instructions proposal: ======== ===== ========================= ============ code value description notes ======== ===== ========================= ============ BPF_JA 0x00 PC += imm BPF_JMP32 only Is this instruction using source 1 instead of 0? Otherwise, it would have exactly the same encoding than the V3< JA instruction. Is that what is intended? TIA.