Commit bcd76111 authored by Herbert Xu's avatar Herbert Xu Committed by David S. Miller
Browse files

[NET]: Generalise TSO-specific bits from skb_setup_caps 



This patch generalises the TSO-specific bits from sk_setup_caps by adding
the sk_gso_type member to struct sock.  This makes sk_setup_caps generic
so that it can be used by TCPv6 or UFO.

The only catch is that whoever uses this must provide a GSO implementation
for their protocol which I think is a fair deal :) For now UFO continues to
live without a GSO implementation which is OK since it doesn't use the sock
caps field at the moment.

Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent adcfc7d0

include/linux/netdevice.h

+9 −3
Original line number Diff line number Diff line
@@ -313,6 +313,7 @@ struct net_device 


	/* Segmentation offload features */

#define NETIF_F_GSO_SHIFT	16

#define NETIF_F_GSO_MASK	0xffff0000

#define NETIF_F_TSO		(SKB_GSO_TCPV4 << NETIF_F_GSO_SHIFT)

#define NETIF_F_UFO		(SKB_GSO_UDPV4 << NETIF_F_GSO_SHIFT)

#define NETIF_F_GSO_ROBUST	(SKB_GSO_DODGY << NETIF_F_GSO_SHIFT)
@@ -991,13 +992,18 @@ extern void dev_seq_stop(struct seq_file *seq, void *v); 


extern void linkwatch_run_queue(void);



static inline int skb_gso_ok(struct sk_buff *skb, int features)

static inline int net_gso_ok(int features, int gso_type)

{

	int feature = skb_shinfo(skb)->gso_size ?

		      skb_shinfo(skb)->gso_type << NETIF_F_GSO_SHIFT : 0;

	int feature = gso_type << NETIF_F_GSO_SHIFT;

	return (features & feature) == feature;

}



static inline int skb_gso_ok(struct sk_buff *skb, int features)

{

	return net_gso_ok(features, skb_shinfo(skb)->gso_size ?

				    skb_shinfo(skb)->gso_type : 0);

}



static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)

{

	return !skb_gso_ok(skb, dev->features);

include/net/sock.h

+10 −3
Original line number Diff line number Diff line
@@ -140,6 +140,7 @@ struct sock_common { 
  *	@sk_flags: %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE, %SO_OOBINLINE settings

  *	@sk_no_check: %SO_NO_CHECK setting, wether or not checkup packets

  *	@sk_route_caps: route capabilities (e.g. %NETIF_F_TSO)

  *	@sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4)

  *	@sk_lingertime: %SO_LINGER l_linger setting

  *	@sk_backlog: always used with the per-socket spinlock held

  *	@sk_callback_lock: used with the callbacks in the end of this struct
@@ -211,6 +212,7 @@ struct sock { 
	gfp_t			sk_allocation;

	int			sk_sndbuf;

	int			sk_route_caps;

	int			sk_gso_type;

	int			sk_rcvlowat;

	unsigned long 		sk_flags;

	unsigned long	        sk_lingertime;
@@ -1025,15 +1027,20 @@ extern struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie); 


extern struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie);



static inline int sk_can_gso(const struct sock *sk)

{

	return net_gso_ok(sk->sk_route_caps, sk->sk_gso_type);

}



static inline void sk_setup_caps(struct sock *sk, struct dst_entry *dst)

{

	__sk_dst_set(sk, dst);

	sk->sk_route_caps = dst->dev->features;

	if (sk->sk_route_caps & NETIF_F_GSO)

		sk->sk_route_caps |= NETIF_F_TSO;

	if (sk->sk_route_caps & NETIF_F_TSO) {

		sk->sk_route_caps |= NETIF_F_GSO_MASK;

	if (sk_can_gso(sk)) {

		if (dst->header_len)

			sk->sk_route_caps &= ~NETIF_F_TSO;

			sk->sk_route_caps &= ~NETIF_F_GSO_MASK;

		else 

			sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;

	}

include/net/tcp.h

+1 −1
Original line number Diff line number Diff line
@@ -751,7 +751,7 @@ static inline int tcp_is_cwnd_limited(const struct sock *sk, u32 in_flight) 
	if (in_flight >= tp->snd_cwnd)

		return 1;



	if (!(sk->sk_route_caps & NETIF_F_TSO))

	if (!sk_can_gso(sk))

		return 0;



	left = tp->snd_cwnd - in_flight;

net/ipv4/tcp.c

+1 −1
Original line number Diff line number Diff line
@@ -643,7 +643,7 @@ static inline int select_size(struct sock *sk, struct tcp_sock *tp) 
	int tmp = tp->mss_cache;



	if (sk->sk_route_caps & NETIF_F_SG) {

		if (sk->sk_route_caps & NETIF_F_TSO)

		if (sk_can_gso(sk))

			tmp = 0;

		else {

			int pgbreak = SKB_MAX_HEAD(MAX_TCP_HEADER);

net/ipv4/tcp_ipv4.c

+2 −0
Original line number Diff line number Diff line
@@ -242,6 +242,7 @@ int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) 
		goto failure;



	/* OK, now commit destination to socket.  */

	sk->sk_gso_type = SKB_GSO_TCPV4;

	sk_setup_caps(sk, &rt->u.dst);



	if (!tp->write_seq)
@@ -884,6 +885,7 @@ struct sock *tcp_v4_syn_recv_sock(struct sock *sk, struct sk_buff *skb, 
	if (!newsk)

		goto exit;



	newsk->sk_gso_type = SKB_GSO_TCPV4;

	sk_setup_caps(newsk, dst);



	newtp		      = tcp_sk(newsk);

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