[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>

3 files changed, 16 insertions, 0 deletions

diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index ed1440ea4c91..d2c390eff1b2 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -269,6 +269,8 @@ u32 ethtool_op_get_tso(struct net_device *dev);
 int ethtool_op_set_tso(struct net_device *dev, u32 data);
 int ethtool_op_get_perm_addr(struct net_device *dev, 
                              struct ethtool_perm_addr *addr, u8 *data);
+u32 ethtool_op_get_ufo(struct net_device *dev);
+int ethtool_op_set_ufo(struct net_device *dev, u32 data);
 
 /**
  * &ethtool_ops - Alter and report network device settings
@@ -298,6 +300,8 @@ int ethtool_op_get_perm_addr(struct net_device *dev,
  * set_sg: Turn scatter-gather on or off
  * get_tso: Report whether TCP segmentation offload is enabled
  * set_tso: Turn TCP segmentation offload on or off
+ * get_ufo: Report whether UDP fragmentation offload is enabled
+ * set_ufo: Turn UDP fragmentation offload on or off
  * self_test: Run specified self-tests
  * get_strings: Return a set of strings that describe the requested objects 
  * phys_id: Identify the device
@@ -364,6 +368,8 @@ struct ethtool_ops {
         int     (*get_perm_addr)(struct net_device *, struct ethtool_perm_addr *, u8 *);
         int     (*begin)(struct net_device *);
         void    (*complete)(struct net_device *);
+        u32     (*get_ufo)(struct net_device *);
+        int     (*set_ufo)(struct net_device *, u32);
 };
 
 /* CMDs currently supported */
@@ -400,6 +406,8 @@ struct ethtool_ops {
 #define ETHTOOL_GTSO            0x0000001e /* Get TSO enable (ethtool_value) */
 #define ETHTOOL_STSO            0x0000001f /* Set TSO enable (ethtool_value) */
 #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) */
 
 /* compatibility with older code */
 #define SPARC_ETH_GSET          ETHTOOL_GSET
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index a9281b24c40b..c6efce4a04a4 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -308,6 +308,7 @@ struct net_device
 #define NETIF_F_VLAN_CHALLENGED 1024    /* Device cannot handle VLAN packets */
 #define NETIF_F_TSO             2048    /* Can offload TCP/IP segmentation */
 #define NETIF_F_LLTX            4096    /* LockLess TX */
+#define NETIF_F_UFO             8192    /* Can offload UDP Large Send*/
 
         struct net_device       *next_sched;
 
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index b756935da9c8..4286d832166f 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -137,6 +137,8 @@ struct skb_shared_info {
         unsigned int    nr_frags;
         unsigned short  tso_size;
         unsigned short  tso_segs;
+        unsigned short  ufo_size;
+        unsigned int    ip6_frag_id;
         struct sk_buff  *frag_list;
         skb_frag_t      frags[MAX_SKB_FRAGS];
 };
@@ -341,6 +343,11 @@ extern void	      skb_over_panic(struct sk_buff *skb, int len,
 extern void           skb_under_panic(struct sk_buff *skb, int len,
                                       void *here);
 
+extern int skb_append_datato_frags(struct sock *sk, struct sk_buff *skb,
+                        int getfrag(void *from, char *to, int offset,
+                        int len,int odd, struct sk_buff *skb),
+                        void *from, int length);
+
 struct skb_seq_state
 {
         __u32           lower_offset;