BNXT_SEG_HDR_LEN
data = buf + BNXT_SEG_HDR_LEN + extra_hlen;
memcpy(buf, &seg_hdr, BNXT_SEG_HDR_LEN);
buf += BNXT_SEG_HDR_LEN;
len += BNXT_SEG_HDR_LEN + seg_len;