[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, 70 insertions, 1 deletions

diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 563b442ffab8..614296a920c6 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -147,7 +147,8 @@ static int ip6_output2(struct sk_buff *skb)
 
 int ip6_output(struct sk_buff *skb)
 {
-        if (skb->len > dst_mtu(skb->dst) || dst_allfrag(skb->dst))
+        if ((skb->len > dst_mtu(skb->dst) && !skb_shinfo(skb)->ufo_size) ||
+                                dst_allfrag(skb->dst))
                 return ip6_fragment(skb, ip6_output2);
         else
                 return ip6_output2(skb);
@@ -768,6 +769,65 @@ out_err_release:
         *dst = NULL;
         return err;
 }
+inline int ip6_ufo_append_data(struct sock *sk,
+                        int getfrag(void *from, char *to, int offset, int len,
+                        int odd, struct sk_buff *skb),
+                        void *from, int length, int hh_len, int fragheaderlen,
+                        int transhdrlen, int mtu,unsigned int flags)
+
+{
+        struct sk_buff *skb;
+        int err;
+
+        /* There is support for UDP large send offload by network
+         * device, so create one single skb packet containing complete
+         * udp datagram
+         */
+        if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) {
+                skb = sock_alloc_send_skb(sk,
+                        hh_len + fragheaderlen + transhdrlen + 20,
+                        (flags & MSG_DONTWAIT), &err);
+                if (skb == NULL)
+                        return -ENOMEM;
+
+                /* reserve space for Hardware header */
+                skb_reserve(skb, hh_len);
+
+                /* create space for UDP/IP header */
+                skb_put(skb,fragheaderlen + transhdrlen);
+
+                /* initialize network header pointer */
+                skb->nh.raw = skb->data;
+
+                /* initialize protocol header pointer */
+                skb->h.raw = skb->data + fragheaderlen;
+
+                skb->ip_summed = CHECKSUM_HW;
+                skb->csum = 0;
+                sk->sk_sndmsg_off = 0;
+        }
+
+        err = skb_append_datato_frags(sk,skb, getfrag, from,
+                                      (length - transhdrlen));
+        if (!err) {
+                struct frag_hdr fhdr;
+
+                /* specify the length of each IP datagram fragment*/
+                skb_shinfo(skb)->ufo_size = (mtu - fragheaderlen) - 
+                                                sizeof(struct frag_hdr);
+                ipv6_select_ident(skb, &fhdr);
+                skb_shinfo(skb)->ip6_frag_id = fhdr.identification;
+                __skb_queue_tail(&sk->sk_write_queue, skb);
+
+                return 0;
+        }
+        /* There is not enough support do UPD LSO,
+         * so follow normal path
+         */
+        kfree_skb(skb);
+
+        return err;
+}
 
 int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to,
         int offset, int len, int odd, struct sk_buff *skb),
@@ -860,6 +920,15 @@ int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to,
          */
 
         inet->cork.length += length;
+        if (((length > mtu) && (sk->sk_protocol == IPPROTO_UDP)) &&
+            (rt->u.dst.dev->features & NETIF_F_UFO)) {
+
+                if(ip6_ufo_append_data(sk, getfrag, from, length, hh_len,
+                                fragheaderlen, transhdrlen, mtu, flags))
+                        goto error;
+
+                return 0;
+        }
 
         if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL)
                 goto alloc_new_skb;