[IPv4/IPv6]: UFO Scatter-gather approach

Attached is kernel patch for UDP Fragmentation Offload (UFO) feature.

1. This patch incorporate the review comments by Jeff Garzik.
2. Renamed USO as UFO (UDP Fragmentation Offload)
3. udp sendfile support with UFO

This patches uses scatter-gather feature of skb to generate large UDP
datagram. Below is a "how-to" on changes required in network device
driver to use the UFO interface.

UDP Fragmentation Offload (UFO) Interface:
-------------------------------------------
UFO is a feature wherein the Linux kernel network stack will offload the
IP fragmentation functionality of large UDP datagram to hardware. This
will reduce the overhead of stack in fragmenting the large UDP datagram to
MTU sized packets

1) Drivers indicate their capability of UFO using
dev->features |= NETIF_F_UFO | NETIF_F_HW_CSUM | NETIF_F_SG

NETIF_F_HW_CSUM is required for UFO over ipv6.

2) UFO packet will be submitted for transmission using driver xmit routine.
UFO packet will have a non-zero value for

"skb_shinfo(skb)->ufo_size"

skb_shinfo(skb)->ufo_size will indicate the length of data part in each IP
fragment going out of the adapter after IP fragmentation by hardware.

skb->data will contain MAC/IP/UDP header and skb_shinfo(skb)->frags[]
contains the data payload. The skb->ip_summed will be set to CHECKSUM_HW
indicating that hardware has to do checksum calculation. Hardware should
compute the UDP checksum of complete datagram and also ip header checksum of
each fragmented IP packet.

For IPV6 the UFO provides the fragment identification-id in
skb_shinfo(skb)->ip6_frag_id. The adapter should use this ID for generating
IPv6 fragments.

Signed-off-by: Ananda Raju <ananda.raju@neterion.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (forwarded)
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>

1 files changed, 53 insertions, 0 deletions

diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 404b761e82c..0350586e919 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -93,6 +93,20 @@ int ethtool_op_get_perm_addr(struct net_device *dev, struct ethtool_perm_addr *a
 }
  
 
+u32 ethtool_op_get_ufo(struct net_device *dev)
+{
+        return (dev->features & NETIF_F_UFO) != 0;
+}
+
+int ethtool_op_set_ufo(struct net_device *dev, u32 data)
+{
+        if (data)
+                dev->features |= NETIF_F_UFO;
+        else
+                dev->features &= ~NETIF_F_UFO;
+        return 0;
+}
+
 /* Handlers for each ethtool command */
 
 static int ethtool_get_settings(struct net_device *dev, void __user *useraddr)
@@ -483,6 +497,11 @@ static int __ethtool_set_sg(struct net_device *dev, u32 data)
                         return err;
         }
 
+        if (!data && dev->ethtool_ops->set_ufo) {
+                err = dev->ethtool_ops->set_ufo(dev, 0);
+                if (err)
+                        return err;
+        }
         return dev->ethtool_ops->set_sg(dev, data);
 }
 
@@ -569,6 +588,32 @@ static int ethtool_set_tso(struct net_device *dev, char __user *useraddr)
         return dev->ethtool_ops->set_tso(dev, edata.data);
 }
 
+static int ethtool_get_ufo(struct net_device *dev, char __user *useraddr)
+{
+        struct ethtool_value edata = { ETHTOOL_GTSO };
+
+        if (!dev->ethtool_ops->get_ufo)
+                return -EOPNOTSUPP;
+        edata.data = dev->ethtool_ops->get_ufo(dev);
+        if (copy_to_user(useraddr, &edata, sizeof(edata)))
+                 return -EFAULT;
+        return 0;
+}
+static int ethtool_set_ufo(struct net_device *dev, char __user *useraddr)
+{
+        struct ethtool_value edata;
+
+        if (!dev->ethtool_ops->set_ufo)
+                return -EOPNOTSUPP;
+        if (copy_from_user(&edata, useraddr, sizeof(edata)))
+                return -EFAULT;
+        if (edata.data && !(dev->features & NETIF_F_SG))
+                return -EINVAL;
+        if (edata.data && !(dev->features & NETIF_F_HW_CSUM))
+                return -EINVAL;
+        return dev->ethtool_ops->set_ufo(dev, edata.data);
+}
+
 static int ethtool_self_test(struct net_device *dev, char __user *useraddr)
 {
         struct ethtool_test test;
@@ -854,6 +899,12 @@ int dev_ethtool(struct ifreq *ifr)
         case ETHTOOL_GPERMADDR:
                 rc = ethtool_get_perm_addr(dev, useraddr);
                 break;
+        case ETHTOOL_GUFO:
+                rc = ethtool_get_ufo(dev, useraddr);
+                break;
+        case ETHTOOL_SUFO:
+                rc = ethtool_set_ufo(dev, useraddr);
+                break;
         default:
                 rc =  -EOPNOTSUPP;
         }
@@ -882,3 +933,5 @@ EXPORT_SYMBOL(ethtool_op_set_sg);
 EXPORT_SYMBOL(ethtool_op_set_tso);
 EXPORT_SYMBOL(ethtool_op_set_tx_csum);
 EXPORT_SYMBOL(ethtool_op_set_tx_hw_csum);
+EXPORT_SYMBOL(ethtool_op_set_ufo);
+EXPORT_SYMBOL(ethtool_op_get_ufo);