ADF_PFVF_BLKMSG_LEN_BYTE
msg_size = ADF_PFVF_BLKMSG_HEADER_SIZE + blkmsg[ADF_PFVF_BLKMSG_LEN_BYTE];
ADF_PFVF_BLKMSG_LEN_BYTE,
&buffer[ADF_PFVF_BLKMSG_LEN_BYTE]);
if (unlikely(!buffer[ADF_PFVF_BLKMSG_LEN_BYTE])) {
msg_len = ADF_PFVF_BLKMSG_HEADER_SIZE + buffer[ADF_PFVF_BLKMSG_LEN_BYTE];