From: Jiong Wang Date: Fri, 1 Dec 2017 05:32:55 +0000 (-0800) Subject: nfp: bpf: correct the encoding for No-Dest immed X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=3239e7bb28a8a4a96c36beeaa6439666e1ed4f8b;p=linux.git nfp: bpf: correct the encoding for No-Dest immed When immed is used with No-Dest, the emitter should use reg.dst instead of reg.areg for the destination, using the latter will actually encode register zero. Signed-off-by: Jiong Wang Reviewed-by: Jakub Kicinski Signed-off-by: Daniel Borkmann --- diff --git a/drivers/net/ethernet/netronome/nfp/bpf/jit.c b/drivers/net/ethernet/netronome/nfp/bpf/jit.c index 54915a3b8a7e9..024b44089623d 100644 --- a/drivers/net/ethernet/netronome/nfp/bpf/jit.c +++ b/drivers/net/ethernet/netronome/nfp/bpf/jit.c @@ -224,9 +224,11 @@ emit_immed(struct nfp_prog *nfp_prog, swreg dst, u16 imm, return; } - __emit_immed(nfp_prog, reg.areg, reg.breg, imm >> 8, width, - invert, shift, reg.wr_both, - reg.dst_lmextn, reg.src_lmextn); + /* Use reg.dst when destination is No-Dest. */ + __emit_immed(nfp_prog, + swreg_type(dst) == NN_REG_NONE ? reg.dst : reg.areg, + reg.breg, imm >> 8, width, invert, shift, + reg.wr_both, reg.dst_lmextn, reg.src_lmextn); } static void