[NET] front: Make netfront compile against kernels without the GSO patch.

Signed-off-by: Steven Smith <ssmith@xensource.com>

diff --git a/linux-2.6-xen-sparse/drivers/xen/netfront/netfront.c b/linux-2.6-xen-sparse/drivers/xen/netfront/netfront.c
index 4820dd1e1b4d0ee2183fd61337b1faec1be18054..a2a5fec64d77cb0e8bb67a291b6d444ded60a490 100644 (file)
--- a/linux-2.6-xen-sparse/drivers/xen/netfront/netfront.c
+++ b/linux-2.6-xen-sparse/drivers/xen/netfront/netfront.c
@@ -64,6 +64,20 @@
 
 #define RX_COPY_THRESHOLD 256
 
+/* If we don't have GSO, fake things up so that we never try to use it. */
+#ifndef NETIF_F_GSO
+#define netif_needs_gso(dev, skb)      0
+#define dev_disable_gso_features(dev)  ((void)0)
+#else
+#define HAVE_GSO                       1
+static inline void dev_disable_gso_features(struct net_device *dev)
+{
+       /* Turn off all GSO bits except ROBUST. */
+       dev->features &= (1 << NETIF_F_GSO_SHIFT) - 1;
+       dev->features |= NETIF_F_GSO_ROBUST;
+}
+#endif
+
 #define GRANT_INVALID_REF      0
 
 #define NET_TX_RING_SIZE __RING_SIZE((struct netif_tx_sring *)0, PAGE_SIZE)
@@ -362,11 +376,13 @@ again:
                goto abort_transaction;
        }
 
+#ifdef HAVE_GSO
        err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1);
        if (err) {
                message = "writing feature-gso-tcpv4";
                goto abort_transaction;
        }
+#endif
 
        err = xenbus_transaction_end(xbt, 0);
        if (err) {
@@ -887,6 +903,7 @@ static int network_start_xmit(struct sk_buff *skb, struct net_device *dev)
        if (skb->proto_data_valid) /* remote but checksummed? */
                tx->flags |= NETTXF_data_validated;
 
+#ifdef HAVE_GSO
        if (skb_shinfo(skb)->gso_size) {
                struct netif_extra_info *gso = (struct netif_extra_info *)
                        RING_GET_REQUEST(&np->tx, ++i);
@@ -905,6 +922,7 @@ static int network_start_xmit(struct sk_buff *skb, struct net_device *dev)
                gso->flags = 0;
                extra = gso;
        }
+#endif
 
        np->tx.req_prod_pvt = i + 1;
 
@@ -1151,7 +1169,8 @@ static RING_IDX xennet_fill_frags(struct netfront_info *np,
        return cons;
 }
 
-static int xennet_set_skb_gso(struct sk_buff *skb, struct netif_extra_info *gso)
+static int xennet_set_skb_gso(struct sk_buff *skb,
+                             struct netif_extra_info *gso)
 {
        if (!gso->u.gso.size) {
                if (net_ratelimit())
@@ -1166,6 +1185,7 @@ static int xennet_set_skb_gso(struct sk_buff *skb, struct netif_extra_info *gso)
                return -EINVAL;
        }
 
+#ifdef HAVE_GSO
        skb_shinfo(skb)->gso_size = gso->u.gso.size;
        skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
 
@@ -1174,6 +1194,11 @@ static int xennet_set_skb_gso(struct sk_buff *skb, struct netif_extra_info *gso)
        skb_shinfo(skb)->gso_segs = 0;
 
        return 0;
+#else
+       if (net_ratelimit())
+               WPRINTK("GSO unsupported by this kernel.\n");
+       return -EINVAL;
+#endif
 }
 
 static int netif_poll(struct net_device *dev, int *pbudget)
@@ -1408,6 +1433,7 @@ static int xennet_set_sg(struct net_device *dev, u32 data)
 
 static int xennet_set_tso(struct net_device *dev, u32 data)
 {
+#ifdef HAVE_GSO
        if (data) {
                struct netfront_info *np = netdev_priv(dev);
                int val;
@@ -1420,13 +1446,14 @@ static int xennet_set_tso(struct net_device *dev, u32 data)
        }
 
        return ethtool_op_set_tso(dev, data);
+#else
+       return -ENOSYS;
+#endif
 }
 
 static void xennet_set_features(struct net_device *dev)
 {
-       /* Turn off all GSO bits except ROBUST. */
-       dev->features &= (1 << NETIF_F_GSO_SHIFT) - 1;
-       dev->features |= NETIF_F_GSO_ROBUST;
+       dev_disable_gso_features(dev);
        xennet_set_sg(dev, 0);
 
        /* We need checksum offload to enable scatter/gather and TSO. */