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Commit ebf4e808 authored by Ilya Lesokhin's avatar Ilya Lesokhin Committed by David S. Miller
Browse files

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 <ilyal@mellanox.com>
Signed-off-by: default avatarBoris Pismenny <borisp@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 08303c18

include/net/sock.h

+21 −0
Original line number Diff line number Diff line
@@ -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)

 */

net/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -407,6 +407,9 @@ config GRO_CELLS 
	bool

	default n



config SOCK_VALIDATE_XMIT

	bool



config NET_DEVLINK

	tristate "Network physical/parent device Netlink interface"

	help

net/core/dev.c

+4 −0
Original line number Diff line number Diff line
@@ -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;