Commit ebf4e808 authored by Ilya Lesokhin's avatar Ilya Lesokhin Committed by David S. Miller
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net: Add Software fallback infrastructure for socket dependent offloads

With socket dependent offloads we rely on the netdev to transform
the transmitted packets before sending them to the wire.
When a packet from an offloaded socket is rerouted to a different
device we need to detect it and do the transformation in software.

Signed-off-by: default avatarIlya Lesokhin <>
Signed-off-by: default avatarBoris Pismenny <>
Signed-off-by: default avatarDavid S. Miller <>
parent 08303c18
......@@ -481,6 +481,11 @@ struct sock {
void (*sk_error_report)(struct sock *sk);
int (*sk_backlog_rcv)(struct sock *sk,
struct sk_buff *skb);
struct sk_buff* (*sk_validate_xmit_skb)(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;
......@@ -2332,6 +2337,22 @@ 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 *sk_validate_xmit_skb(struct sk_buff *skb,
struct net_device *dev)
struct sock *sk = skb->sk;
if (sk && sk_fullsock(sk) && sk->sk_validate_xmit_skb)
skb = sk->sk_validate_xmit_skb(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)
......@@ -407,6 +407,9 @@ config GRO_CELLS
default n
tristate "Network physical/parent device Netlink interface"
......@@ -3112,6 +3112,10 @@ static struct sk_buff *validate_xmit_skb(struct sk_buff *skb, struct net_device
if (unlikely(!skb))
goto out_null;
skb = sk_validate_xmit_skb(skb, dev);
if (unlikely(!skb))
goto out_null;
if (netif_needs_gso(skb, features)) {
struct sk_buff *segs;
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