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net: Add Software fallback infrastructure for socket dependent offloads

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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: Ilya Lesokhin <ilyal@mellanox.com>
Signed-off-by: Boris Pismenny <borisp@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ilya Lesokhin
2018-04-30 10:16:12 +03:00
committed by David S. Miller
parent 08303c1895
commit ebf4e808fa
3 changed files with 28 additions and 0 deletions
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21
include/net/sock.h
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@@ -481,6 +481,11 @@ struct sock {
void (*sk_error_report)(struct sock *sk);
int (*sk_backlog_rcv)(struct sock *sk,
struct sk_buff *skb);
#ifdef CONFIG_SOCK_VALIDATE_XMIT
struct sk_buff* (*sk_validate_xmit_skb)(struct sock *sk,
struct net_device *dev,
struct sk_buff *skb);
#endif
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)
{
#ifdef CONFIG_SOCK_VALIDATE_XMIT
struct sock *sk = skb->sk;
if (sk && sk_fullsock(sk) && sk->sk_validate_xmit_skb)
skb = sk->sk_validate_xmit_skb(sk, dev, skb);
#endif
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)
*/