udp: Add GRO functions to UDP socket
This patch adds GRO functions (gro_receive and gro_complete) to UDP
sockets. udp_gro_receive is changed to perform socket lookup on a
packet. If a socket is found the related GRO functions are called.
This features obsoletes using UDP offload infrastructure for GRO
(udp_offload). This has the advantage of not being limited to provide
offload on a per port basis, GRO is now applied to whatever individual
UDP sockets are bound to. This also allows the possbility of
"application defined GRO"-- that is we can attach something like
a BPF program to a UDP socket to perfrom GRO on an application
layer protocol.
Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
index 0ed2daf..65c3fd3 100644
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -179,6 +179,7 @@
return segs;
}
+EXPORT_SYMBOL(skb_udp_tunnel_segment);
static struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb,
netdev_features_t features)
@@ -304,13 +305,13 @@
EXPORT_SYMBOL(udp_del_offload);
struct sk_buff **udp_gro_receive(struct sk_buff **head, struct sk_buff *skb,
- struct udphdr *uh)
+ struct udphdr *uh, udp_lookup_t lookup)
{
- struct udp_offload_priv *uo_priv;
struct sk_buff *p, **pp = NULL;
struct udphdr *uh2;
unsigned int off = skb_gro_offset(skb);
int flush = 1;
+ struct sock *sk;
if (NAPI_GRO_CB(skb)->encap_mark ||
(skb->ip_summed != CHECKSUM_PARTIAL &&
@@ -322,13 +323,11 @@
NAPI_GRO_CB(skb)->encap_mark = 1;
rcu_read_lock();
- uo_priv = rcu_dereference(udp_offload_base);
- for (; uo_priv != NULL; uo_priv = rcu_dereference(uo_priv->next)) {
- if (net_eq(read_pnet(&uo_priv->net), dev_net(skb->dev)) &&
- uo_priv->offload->port == uh->dest &&
- uo_priv->offload->callbacks.gro_receive)
- goto unflush;
- }
+ sk = (*lookup)(skb, uh->source, uh->dest);
+
+ if (sk && udp_sk(sk)->gro_receive)
+ goto unflush;
+
goto out_unlock;
unflush:
@@ -352,9 +351,7 @@
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,
- uo_priv->offload);
+ pp = udp_sk(sk)->gro_receive(sk, head, skb);
out_unlock:
rcu_read_unlock();
@@ -362,6 +359,7 @@
NAPI_GRO_CB(skb)->flush |= flush;
return pp;
}
+EXPORT_SYMBOL(udp_gro_receive);
static struct sk_buff **udp4_gro_receive(struct sk_buff **head,
struct sk_buff *skb)
@@ -383,39 +381,28 @@
inet_gro_compute_pseudo);
skip:
NAPI_GRO_CB(skb)->is_ipv6 = 0;
- return udp_gro_receive(head, skb, uh);
+ return udp_gro_receive(head, skb, uh, udp4_lib_lookup_skb);
flush:
NAPI_GRO_CB(skb)->flush = 1;
return NULL;
}
-int udp_gro_complete(struct sk_buff *skb, int nhoff)
+int udp_gro_complete(struct sk_buff *skb, int nhoff,
+ udp_lookup_t lookup)
{
- struct udp_offload_priv *uo_priv;
__be16 newlen = htons(skb->len - nhoff);
struct udphdr *uh = (struct udphdr *)(skb->data + nhoff);
int err = -ENOSYS;
+ struct sock *sk;
uh->len = newlen;
rcu_read_lock();
-
- uo_priv = rcu_dereference(udp_offload_base);
- for (; uo_priv != NULL; uo_priv = rcu_dereference(uo_priv->next)) {
- if (net_eq(read_pnet(&uo_priv->net), dev_net(skb->dev)) &&
- uo_priv->offload->port == uh->dest &&
- uo_priv->offload->callbacks.gro_complete)
- break;
- }
-
- if (uo_priv) {
- NAPI_GRO_CB(skb)->proto = uo_priv->offload->ipproto;
- err = uo_priv->offload->callbacks.gro_complete(skb,
- nhoff + sizeof(struct udphdr),
- uo_priv->offload);
- }
-
+ sk = (*lookup)(skb, uh->source, uh->dest);
+ if (sk && udp_sk(sk)->gro_complete)
+ err = udp_sk(sk)->gro_complete(sk, skb,
+ nhoff + sizeof(struct udphdr));
rcu_read_unlock();
if (skb->remcsum_offload)
@@ -426,6 +413,7 @@
return err;
}
+EXPORT_SYMBOL(udp_gro_complete);
static int udp4_gro_complete(struct sk_buff *skb, int nhoff)
{
@@ -440,7 +428,7 @@
skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL;
}
- return udp_gro_complete(skb, nhoff);
+ return udp_gro_complete(skb, nhoff, udp4_lib_lookup_skb);
}
static const struct net_offload udpv4_offload = {