RTL_FRAG_LEN
int frag_num = fw_len / RTL_FRAG_LEN + 1;
int frag_len = RTL_FRAG_LEN;
frag_len = fw_len % RTL_FRAG_LEN;
data += RTL_FRAG_LEN;
__u8 data[RTL_FRAG_LEN];