KSZ_PTP_TAG_LEN
u8 *tstamp_raw = tag - KSZ_PTP_TAG_LEN;
put_unaligned_be32(tstamp_raw, skb_put(skb, KSZ_PTP_TAG_LEN));
len += KSZ_PTP_TAG_LEN;
.needed_tailroom = KSZ9477_INGRESS_TAG_LEN + KSZ_PTP_TAG_LEN,
.needed_tailroom = KSZ_INGRESS_TAG_LEN + KSZ_PTP_TAG_LEN,
.needed_tailroom = LAN937X_EGRESS_TAG_LEN + KSZ_PTP_TAG_LEN,