s390/qeth: add support for IPv6 TSO

This adds TSO6 support for L3 qeth devices.
Just like for standard IPv6 traffic, TSO6 doesn't use IP offload and
thus runs over the normal qeth_xmit() path.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 19 insertions, 26 deletions

diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index 80893481bb85..ac7c8ae123c3 100644
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -2099,22 +2099,6 @@ static void qeth_l3_fill_header(struct qeth_card *card, struct qeth_hdr *hdr,
 	rcu_read_unlock();
 }
 
-static void qeth_l3_fill_tso_ext(struct qeth_hdr_tso *hdr,
-				 unsigned int payload_len, struct sk_buff *skb,
-				 unsigned int proto_len)
-{
-	struct qeth_hdr_ext_tso *ext = &hdr->ext;
-
-	ext->hdr_tot_len = sizeof(*ext);
-	ext->imb_hdr_no = 1;
-	ext->hdr_type = 1;
-	ext->hdr_version = 1;
-	ext->hdr_len = 28;
-	ext->payload_len = payload_len;
-	ext->mss = skb_shinfo(skb)->gso_size;
-	ext->dg_hdr_len = proto_len;
-}
-
 static void qeth_l3_fixup_headers(struct sk_buff *skb)
 {
 	struct iphdr *iph = ip_hdr(skb);
@@ -2175,9 +2159,9 @@ static int qeth_l3_xmit(struct qeth_card *card, struct sk_buff *skb,
 	} else {
 		qeth_l3_fill_header(card, hdr, skb, ipv, cast_type, frame_len);
 		if (is_tso)
-			qeth_l3_fill_tso_ext((struct qeth_hdr_tso *) hdr,
-					     frame_len - proto_len, skb,
-					     proto_len);
+			qeth_fill_tso_ext((struct qeth_hdr_tso *) hdr,
+					  frame_len - proto_len, skb,
+					  proto_len);
 	}
 
 	is_sg = skb_is_nonlinear(skb);
@@ -2401,6 +2385,7 @@ static const struct net_device_ops qeth_l3_osa_netdev_ops = {
 
 static int qeth_l3_setup_netdev(struct qeth_card *card)
 {
+	unsigned int headroom;
 	int rc;
 
 	if (card->dev->netdev_ops)
@@ -2415,11 +2400,6 @@ static int qeth_l3_setup_netdev(struct qeth_card *card)
 		}
 
 		card->dev->netdev_ops = &qeth_l3_osa_netdev_ops;
-		card->dev->needed_headroom = sizeof(struct qeth_hdr);
-		/* allow for de-acceleration of NETIF_F_HW_VLAN_CTAG_TX: */
-		card->dev->needed_headroom += VLAN_HLEN;
-		if (qeth_is_supported(card, IPA_OUTBOUND_TSO))
-			card->dev->needed_headroom = sizeof(struct qeth_hdr_tso);
 
 		/*IPv6 address autoconfiguration stuff*/
 		qeth_l3_get_unique_id(card);
@@ -2438,10 +2418,22 @@ static int qeth_l3_setup_netdev(struct qeth_card *card)
 			card->dev->hw_features |= NETIF_F_IPV6_CSUM;
 			card->dev->vlan_features |= NETIF_F_IPV6_CSUM;
 		}
+		if (qeth_is_supported6(card, IPA_OUTBOUND_TSO)) {
+			card->dev->hw_features |= NETIF_F_TSO6;
+			card->dev->vlan_features |= NETIF_F_TSO6;
+		}
+
+		/* allow for de-acceleration of NETIF_F_HW_VLAN_CTAG_TX: */
+		if (card->dev->hw_features & NETIF_F_TSO6)
+			headroom = sizeof(struct qeth_hdr_tso) + VLAN_HLEN;
+		else if (card->dev->hw_features & NETIF_F_TSO)
+			headroom = sizeof(struct qeth_hdr_tso);
+		else
+			headroom = sizeof(struct qeth_hdr) + VLAN_HLEN;
 	} else if (card->info.type == QETH_CARD_TYPE_IQD) {
 		card->dev->flags |= IFF_NOARP;
 		card->dev->netdev_ops = &qeth_l3_netdev_ops;
-		card->dev->needed_headroom = sizeof(struct qeth_hdr) - ETH_HLEN;
+		headroom = sizeof(struct qeth_hdr) - ETH_HLEN;
 
 		rc = qeth_l3_iqd_read_initial_mac(card);
 		if (rc)
@@ -2452,13 +2444,14 @@ static int qeth_l3_setup_netdev(struct qeth_card *card)
 	} else
 		return -ENODEV;
 
+	card->dev->needed_headroom = headroom;
 	card->dev->ethtool_ops = &qeth_l3_ethtool_ops;
 	card->dev->features |=	NETIF_F_HW_VLAN_CTAG_TX |
 				NETIF_F_HW_VLAN_CTAG_RX |
 				NETIF_F_HW_VLAN_CTAG_FILTER;
 
 	netif_keep_dst(card->dev);
-	if (card->dev->hw_features & NETIF_F_TSO)
+	if (card->dev->hw_features & (NETIF_F_TSO | NETIF_F_TSO6))
 		netif_set_gso_max_size(card->dev,
 				       PAGE_SIZE * (QETH_MAX_BUFFER_ELEMENTS(card) - 1));