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[NET]: Merge TSO/UFO fields in sk_buff

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Having separate fields in sk_buff for TSO/UFO (tso_size/ufo_size) is not
going to scale if we add any more segmentation methods (e.g., DCCP).  So
let's merge them.

They were used to tell the protocol of a packet.  This function has been
subsumed by the new gso_type field.  This is essentially a set of netdev
feature bits (shifted by 16 bits) that are required to process a specific
skb.  As such it's easy to tell whether a given device can process a GSO
skb: you just have to and the gso_type field and the netdev's features
field.

I've made gso_type a conjunction.  The idea is that you have a base type
(e.g., SKB_GSO_TCPV4) that can be modified further to support new features.
For example, if we add a hardware TSO type that supports ECN, they would
declare NETIF_F_TSO | NETIF_F_TSO_ECN.  All TSO packets with CWR set would
have a gso_type of SKB_GSO_TCPV4 | SKB_GSO_TCPV4_ECN while all other TSO
packets would be SKB_GSO_TCPV4.  This means that only the CWR packets need
to be emulated in software.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2006-06-22 02:40:14 -07:00 • committed by David S. Miller
parent d4828d85d1
commit 7967168cef
27 changed files with 120 additions and 90 deletions
Download patch file Download diff file Expand all files Collapse all files

16
net/ipv4/ip_output.c
View file

@ -210,8 +210,7 @@ static inline int ip_finish_output(struct sk_buff *skb)
return dst_output(skb);
}
#endif
if (skb->len > dst_mtu(skb->dst) &&
!(skb_shinfo(skb)->ufo_size || skb_shinfo(skb)->tso_size))
if (skb->len > dst_mtu(skb->dst) && !skb_shinfo(skb)->gso_size)
return ip_fragment(skb, ip_finish_output2);
else
return ip_finish_output2(skb);
@ -362,7 +361,7 @@ packet_routed:
}
ip_select_ident_more(iph, &rt->u.dst, sk,
(skb_shinfo(skb)->tso_segs ?: 1) - 1);
(skb_shinfo(skb)->gso_segs ?: 1) - 1);
/* Add an IP checksum. */
ip_send_check(iph);
@ -744,7 +743,8 @@ static inline int ip_ufo_append_data(struct sock *sk,
(length - transhdrlen));
if (!err) {
/* specify the length of each IP datagram fragment*/
skb_shinfo(skb)->ufo_size = (mtu - fragheaderlen);
skb_shinfo(skb)->gso_size = mtu - fragheaderlen;
skb_shinfo(skb)->gso_type = SKB_GSO_UDPV4;
__skb_queue_tail(&sk->sk_write_queue, skb);
return 0;
@ -1087,14 +1087,16 @@ ssize_t ip_append_page(struct sock *sk, struct page *page,
inet->cork.length += size;
if ((sk->sk_protocol == IPPROTO_UDP) &&
(rt->u.dst.dev->features & NETIF_F_UFO))
skb_shinfo(skb)->ufo_size = (mtu - fragheaderlen);
(rt->u.dst.dev->features & NETIF_F_UFO)) {
skb_shinfo(skb)->gso_size = mtu - fragheaderlen;
skb_shinfo(skb)->gso_type = SKB_GSO_UDPV4;
}
while (size > 0) {
int i;
if (skb_shinfo(skb)->ufo_size)
if (skb_shinfo(skb)->gso_size)
len = size;
else {