r8169: remove r8169_csum_workaround

	return skb->len < ETH_ZLEN && tp->mac_version == RTL_GIGA_MAC_VER_34;

}

static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb,

				      struct net_device *dev);

/* r8169_csum_workaround()

 * The hw limites the value the transport offset. When the offset is out of the

 * range, calculate the checksum by sw.

 */

static void r8169_csum_workaround(struct rtl8169_private *tp,

				  struct sk_buff *skb)

{

	if (skb_is_gso(skb)) {

		netdev_features_t features = tp->dev->features;

		struct sk_buff *segs, *nskb;

		features &= ~(NETIF_F_SG | NETIF_F_IPV6_CSUM | NETIF_F_TSO6);

		segs = skb_gso_segment(skb, features);

		if (IS_ERR(segs) || !segs)

			goto drop;

		do {

			nskb = segs;

			segs = segs->next;

			nskb->next = NULL;

			rtl8169_start_xmit(nskb, tp->dev);

		} while (segs);

		dev_consume_skb_any(skb);

	} else {

drop:

		tp->dev->stats.tx_dropped++;

		dev_kfree_skb_any(skb);

	}

}

/* msdn_giant_send_check()

 * According to the document of microsoft, the TCP Pseudo Header excludes the

 * packet length for IPv6 TCP large packets.

	opts[0] = DescOwn;

	if (rtl_chip_supports_csum_v2(tp)) {

		if (!rtl8169_tso_csum_v2(tp, skb, opts)) {

			r8169_csum_workaround(tp, skb);

			return NETDEV_TX_OK;

		}

		if (!rtl8169_tso_csum_v2(tp, skb, opts))

			goto err_dma_0;

	} else {

		rtl8169_tso_csum_v1(skb, opts);

	}