sunvnet: add checksum offload support

This patch adds support for sender-side checksum offloading.

Signed-off-by: David L Stevens <david.stevens@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/sun/sunvnet.c b/drivers/net/ethernet/sun/sunvnet.c
index b6a5336..b172eda 100644 (file)
--- a/drivers/net/ethernet/sun/sunvnet.c
+++ b/drivers/net/ethernet/sun/sunvnet.c
@@ -375,6 +375,8 @@ static int vnet_rx_one(struct vnet_port *port, struct vio_net_desc *desc)
                }
        }
 
+       skb->ip_summed = port->switch_port ? CHECKSUM_NONE : CHECKSUM_PARTIAL;
+
        dev->stats.rx_packets++;
        dev->stats.rx_bytes += len;
        napi_gro_receive(&port->napi, skb);
@@ -1047,7 +1049,8 @@ static inline struct sk_buff *vnet_skb_shape(struct sk_buff *skb, int ncookies)
        if (((unsigned long)skb->data & 7) != VNET_PACKET_SKIP ||
            skb_tailroom(skb) < pad ||
            skb_headroom(skb) < VNET_PACKET_SKIP || docopy) {
-               int offset;
+               int start = 0, offset;
+               __wsum csum;
 
                len = skb->len > ETH_ZLEN ? skb->len : ETH_ZLEN;
                nskb = alloc_and_align_skb(skb->dev, len);
@@ -1065,10 +1068,35 @@ static inline struct sk_buff *vnet_skb_shape(struct sk_buff *skb, int ncookies)
                offset = skb_transport_header(skb) - skb->data;
                skb_set_transport_header(nskb, offset);
 
+               offset = 0;
                nskb->csum_offset = skb->csum_offset;
                nskb->ip_summed = skb->ip_summed;
 
-               if (skb_copy_bits(skb, 0, nskb->data, skb->len)) {
+               if (skb->ip_summed == CHECKSUM_PARTIAL)
+                       start = skb_checksum_start_offset(skb);
+               if (start) {
+                       struct iphdr *iph = ip_hdr(nskb);
+                       int offset = start + nskb->csum_offset;
+
+                       if (skb_copy_bits(skb, 0, nskb->data, start)) {
+                               dev_kfree_skb(nskb);
+                               dev_kfree_skb(skb);
+                               return NULL;
+                       }
+                       *(__sum16 *)(skb->data + offset) = 0;
+                       csum = skb_copy_and_csum_bits(skb, start,
+                                                     nskb->data + start,
+                                                     skb->len - start, 0);
+                       if (iph->protocol == IPPROTO_TCP ||
+                           iph->protocol == IPPROTO_UDP) {
+                               csum = csum_tcpudp_magic(iph->saddr, iph->daddr,
+                                                        skb->len - start,
+                                                        iph->protocol, csum);
+                       }
+                       *(__sum16 *)(nskb->data + offset) = csum;
+
+                       nskb->ip_summed = CHECKSUM_NONE;
+               } else if (skb_copy_bits(skb, 0, nskb->data, skb->len)) {
                        dev_kfree_skb(nskb);
                        dev_kfree_skb(skb);
                        return NULL;
@@ -1150,6 +1178,9 @@ static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
                goto out_dropped;
        }
 
+       if (skb->ip_summed == CHECKSUM_PARTIAL)
+               vnet_fullcsum(skb);
+
        dr = &port->vio.drings[VIO_DRIVER_TX_RING];
        i = skb_get_queue_mapping(skb);
        txq = netdev_get_tx_queue(dev, i);
@@ -1611,7 +1642,7 @@ static struct vnet *vnet_new(const u64 *local_mac)
        dev->ethtool_ops = &vnet_ethtool_ops;
        dev->watchdog_timeo = VNET_TX_TIMEOUT;
 
-       dev->hw_features = NETIF_F_SG;
+       dev->hw_features = NETIF_F_HW_CSUM | NETIF_F_SG;
        dev->features = dev->hw_features;
 
        err = register_netdev(dev);