fou: Add GRO support

Implement fou_gro_receive and fou_gro_complete, and populate these
in the correponsing udp_offloads for the socket. Added ipproto to
udp_offloads and pass this from UDP to the fou GRO routine in proto
field of napi_gro_cb structure.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 28d4378..4354b43 100644 (file)
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1874,7 +1874,7 @@ struct napi_gro_cb {
        /* jiffies when first packet was created/queued */
        unsigned long age;
 
-       /* Used in ipv6_gro_receive() */
+       /* Used in ipv6_gro_receive() and foo-over-udp */
        u16     proto;
 
        /* Used in udp_gro_receive */
@@ -1925,6 +1925,7 @@ struct packet_offload {
 
 struct udp_offload {
        __be16                   port;
+       u8                       ipproto;
        struct offload_callbacks callbacks;
 };
 

diff --git a/net/ipv4/fou.c b/net/ipv4/fou.c
index d44f97b..dced89f 100644 (file)
--- a/net/ipv4/fou.c
+++ b/net/ipv4/fou.c
@@ -8,6 +8,7 @@
 #include <linux/kernel.h>
 #include <net/genetlink.h>
 #include <net/ip.h>
+#include <net/protocol.h>
 #include <net/udp.h>
 #include <net/udp_tunnel.h>
 #include <net/xfrm.h>
@@ -21,6 +22,7 @@ struct fou {
        struct socket *sock;
        u8 protocol;
        u16 port;
+       struct udp_offload udp_offloads;
        struct list_head list;
 };
 
@@ -62,6 +64,69 @@ static int fou_udp_recv(struct sock *sk, struct sk_buff *skb)
                                          sizeof(struct udphdr));
 }
 
+static struct sk_buff **fou_gro_receive(struct sk_buff **head,
+                                       struct sk_buff *skb,
+                                       const struct net_offload **offloads)
+{
+       const struct net_offload *ops;
+       struct sk_buff **pp = NULL;
+       u8 proto = NAPI_GRO_CB(skb)->proto;
+
+       rcu_read_lock();
+       ops = rcu_dereference(offloads[proto]);
+       if (!ops || !ops->callbacks.gro_receive)
+               goto out_unlock;
+
+       pp = ops->callbacks.gro_receive(head, skb);
+
+out_unlock:
+       rcu_read_unlock();
+
+       return pp;
+}
+
+static int fou_gro_complete(struct sk_buff *skb, int nhoff,
+                           const struct net_offload **offloads)
+{
+       const struct net_offload *ops;
+       u8 proto = NAPI_GRO_CB(skb)->proto;
+       int err = -ENOSYS;
+
+       rcu_read_lock();
+       ops = rcu_dereference(offloads[proto]);
+       if (WARN_ON(!ops || !ops->callbacks.gro_complete))
+               goto out_unlock;
+
+       err = ops->callbacks.gro_complete(skb, nhoff);
+
+out_unlock:
+       rcu_read_unlock();
+
+       return err;
+}
+
+static struct sk_buff **fou4_gro_receive(struct sk_buff **head,
+                                        struct sk_buff *skb)
+{
+       return fou_gro_receive(head, skb, inet_offloads);
+}
+
+static int fou4_gro_complete(struct sk_buff *skb, int nhoff)
+{
+       return fou_gro_complete(skb, nhoff, inet_offloads);
+}
+
+static struct sk_buff **fou6_gro_receive(struct sk_buff **head,
+                                        struct sk_buff *skb)
+{
+       return fou_gro_receive(head, skb, inet6_offloads);
+}
+
+static int fou6_gro_complete(struct sk_buff *skb, int nhoff)
+{
+       return fou_gro_complete(skb, nhoff, inet6_offloads);
+}
+
 static int fou_add_to_port_list(struct fou *fou)
 {
        struct fou *fout;
@@ -134,6 +199,29 @@ static int fou_create(struct net *net, struct fou_cfg *cfg,
 
        sk->sk_allocation = GFP_ATOMIC;
 
+       switch (cfg->udp_config.family) {
+       case AF_INET:
+               fou->udp_offloads.callbacks.gro_receive = fou4_gro_receive;
+               fou->udp_offloads.callbacks.gro_complete = fou4_gro_complete;
+               break;
+       case AF_INET6:
+               fou->udp_offloads.callbacks.gro_receive = fou6_gro_receive;
+               fou->udp_offloads.callbacks.gro_complete = fou6_gro_complete;
+               break;
+       default:
+               err = -EPFNOSUPPORT;
+               goto error;
+       }
+
+       fou->udp_offloads.port = cfg->udp_config.local_udp_port;
+       fou->udp_offloads.ipproto = cfg->protocol;
+
+       if (cfg->udp_config.family == AF_INET) {
+               err = udp_add_offload(&fou->udp_offloads);
+               if (err)
+                       goto error;
+       }
+
        err = fou_add_to_port_list(fou);
        if (err)
                goto error;
@@ -160,6 +248,7 @@ static int fou_destroy(struct net *net, struct fou_cfg *cfg)
        spin_lock(&fou_lock);
        list_for_each_entry(fou, &fou_list, list) {
                if (fou->port == port) {
+                       udp_del_offload(&fou->udp_offloads);
                        fou_release(fou);
                        err = 0;
                        break;

diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
index adab393..d7c43f7 100644 (file)
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -276,6 +276,7 @@ unflush:
 
        skb_gro_pull(skb, sizeof(struct udphdr)); /* pull encapsulating udp header */
        skb_gro_postpull_rcsum(skb, uh, sizeof(struct udphdr));
+       NAPI_GRO_CB(skb)->proto = uo_priv->offload->ipproto;
        pp = uo_priv->offload->callbacks.gro_receive(head, skb);
 
 out_unlock:
@@ -329,8 +330,10 @@ int udp_gro_complete(struct sk_buff *skb, int nhoff)
                        break;
        }
 
-       if (uo_priv != NULL)
+       if (uo_priv != NULL) {
+               NAPI_GRO_CB(skb)->proto = uo_priv->offload->ipproto;
                err = uo_priv->offload->callbacks.gro_complete(skb, nhoff + sizeof(struct udphdr));
+       }
 
        rcu_read_unlock();
        return err;