[4/5] [NET]: Added GSO toggle

[Herbert Xu]

Hi:

[NET]: Added GSO toggle

This patch adds a generic segmentation offload toggle that can be turned
on/off for each net device.  For now it only supports in TCPv4.

Signed-off-by: Herbert Xu <[EMAIL PROTECTED]>

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <[EMAIL PROTECTED]>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -408,6 +408,8 @@ struct ethtool_ops {
 #define ETHTOOL_GPERMADDR      0x00000020 /* Get permanent hardware address */
 #define ETHTOOL_GUFO           0x00000021 /* Get UFO enable (ethtool_value) */
 #define ETHTOOL_SUFO           0x00000022 /* Set UFO enable (ethtool_value) */
+#define ETHTOOL_GGSO           0x00000023 /* Get GSO enable (ethtool_value) */
+#define ETHTOOL_SGSO           0x00000024 /* Set GSO enable (ethtool_value) */
 
 /* compatibility with older code */
 #define SPARC_ETH_GSET         ETHTOOL_GSET
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -309,6 +309,7 @@ struct net_device
 #define NETIF_F_HW_VLAN_RX     256     /* Receive VLAN hw acceleration */
 #define NETIF_F_HW_VLAN_FILTER 512     /* Receive filtering on VLAN */
 #define NETIF_F_VLAN_CHALLENGED        1024    /* Device cannot handle VLAN 
packets */
+#define NETIF_F_GSO            2048    /* Enable software GSO. */
 #define NETIF_F_LLTX           4096    /* LockLess TX */
 
        /* Segmentation offload features */
diff --git a/include/net/sock.h b/include/net/sock.h
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1031,9 +1031,13 @@ static inline void sk_setup_caps(struct 
 {
        __sk_dst_set(sk, dst);
        sk->sk_route_caps = dst->dev->features;
+       if (sk->sk_route_caps & NETIF_F_GSO)
+               sk->sk_route_caps |= NETIF_F_TSO;
        if (sk->sk_route_caps & NETIF_F_TSO) {
                if (sock_flag(sk, SOCK_NO_LARGESEND) || dst->header_len)
                        sk->sk_route_caps &= ~NETIF_F_TSO;
+               else 
+                       sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
        }
 }
 
diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -376,15 +376,20 @@ void br_features_recompute(struct net_br
        features = br->feature_mask & ~NETIF_F_ALL_CSUM;
 
        list_for_each_entry(p, &br->port_list, list) {
-               if (checksum & NETIF_F_NO_CSUM &&
-                   !(p->dev->features & NETIF_F_NO_CSUM))
+               unsigned long feature = p->dev->features;
+
+               if (checksum & NETIF_F_NO_CSUM && !(feature & NETIF_F_NO_CSUM))
                        checksum ^= NETIF_F_NO_CSUM | NETIF_F_HW_CSUM;
-               if (checksum & NETIF_F_HW_CSUM &&
-                   !(p->dev->features & NETIF_F_HW_CSUM))
+               if (checksum & NETIF_F_HW_CSUM && !(feature & NETIF_F_HW_CSUM))
                        checksum ^= NETIF_F_HW_CSUM | NETIF_F_IP_CSUM;
-               if (!(p->dev->features & NETIF_F_IP_CSUM))
+               if (!(feature & NETIF_F_IP_CSUM))
                        checksum = 0;
-               features &= p->dev->features;
+
+               if (feature & NETIF_F_GSO)
+                       feature |= NETIF_F_TSO;
+               feature |= NETIF_F_GSO;
+
+               features &= feature;
        }
 
        br->dev->features = features | checksum | NETIF_F_LLTX;
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -614,6 +614,29 @@ static int ethtool_set_ufo(struct net_de
        return dev->ethtool_ops->set_ufo(dev, edata.data);
 }
 
+static int ethtool_get_gso(struct net_device *dev, char __user *useraddr)
+{
+       struct ethtool_value edata = { ETHTOOL_GGSO };
+
+       edata.data = dev->features & NETIF_F_GSO;
+       if (copy_to_user(useraddr, &edata, sizeof(edata)))
+                return -EFAULT;
+       return 0;
+}
+
+static int ethtool_set_gso(struct net_device *dev, char __user *useraddr)
+{
+       struct ethtool_value edata;
+
+       if (copy_from_user(&edata, useraddr, sizeof(edata)))
+               return -EFAULT;
+       if (edata.data)
+               dev->features |= NETIF_F_GSO;
+       else
+               dev->features &= ~NETIF_F_GSO;
+       return 0;
+}
+
 static int ethtool_self_test(struct net_device *dev, char __user *useraddr)
 {
        struct ethtool_test test;
@@ -905,6 +928,12 @@ int dev_ethtool(struct ifreq *ifr)
        case ETHTOOL_SUFO:
                rc = ethtool_set_ufo(dev, useraddr);
                break;
+       case ETHTOOL_GGSO:
+               rc = ethtool_get_gso(dev, useraddr);
+               break;
+       case ETHTOOL_SGSO:
+               rc = ethtool_set_gso(dev, useraddr);
+               break;
        default:
                rc =  -EOPNOTSUPP;
        }