Offloaded sockets rely on the netdev to transform the transmitted
packets before sending them over the network.
When a packet from an offloaded socket is looped back or
rerouted to a different device we need to detect it and
do the transformation in software
Signed-off-by: Ilya Lesokhin <il...@mellanox.com>
---
include/net/sock.h | 17 +++++++++++++++++
net/core/dev.c | 4 ++++
2 files changed, 21 insertions(+)
diff --git a/include/net/sock.h b/include/net/sock.h
index 6f1be97..8da6028 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -480,6 +480,9 @@ struct sock {
void (*sk_error_report)(struct sock *sk);
int (*sk_backlog_rcv)(struct sock *sk,
struct sk_buff *skb);
+ struct sk_buff* (*sk_offload_check)(struct sock *sk,
+ struct net_device *dev,
+ struct sk_buff *skb);
void (*sk_destruct)(struct sock *sk);
struct sock_reuseport __rcu *sk_reuseport_cb;
struct rcu_head sk_rcu;
@@ -2325,6 +2328,20 @@ static inline bool sk_fullsock(const struct sock *sk)
return (1 << sk->sk_state) & ~(TCPF_TIME_WAIT | TCPF_NEW_SYN_RECV);
}
+/* checks if this SKB belongs to an HW offloaded socket
+ * and whether any SW fallbacks are required based on dev.
+ */
+static inline struct sk_buff *skb_offload_check(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ struct sock *sk = skb->sk;
+
+ if (sk && sk_fullsock(sk) && sk->sk_offload_check)
+ skb = sk->sk_offload_check(sk, dev, skb);
+
+ return skb;
+}
+
/* This helper checks if a socket is a LISTEN or NEW_SYN_RECV
* SYNACK messages can be attached to either ones (depending on SYNCOOKIE)
*/
diff --git a/net/core/dev.c b/net/core/dev.c
index 30b5fe3..a31560c 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3068,6 +3068,10 @@ static struct sk_buff *validate_xmit_skb(struct sk_buff
*skb, struct net_device
if (unlikely(!skb))
goto out_null;
+ skb = skb_offload_check(skb, dev);
+ if (!skb)
+ goto out_null;
+
if (netif_needs_gso(skb, features)) {
struct sk_buff *segs;
--
1.8.3.1
