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udp: move scratch area helpers into the include file

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So that they can be later used by the IPv6 code, too.
Also lift the comments a bit.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2017-06-26 19:01:50 +02:00 • committed by David S. Miller
parent d97af30f61
commit b26bbdae46
2 changed files with 61 additions and 60 deletions
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61
include/net/udp.h
View file

@ -302,6 +302,67 @@ struct sock *__udp6_lib_lookup(struct net *net,
struct sock *udp6_lib_lookup_skb(struct sk_buff *skb,
__be16 sport, __be16 dport);
/* UDP uses skb->dev_scratch to cache as much information as possible and avoid
* possibly multiple cache miss on dequeue()
*/
#if BITS_PER_LONG == 64
/* truesize, len and the bit needed to compute skb_csum_unnecessary will be on
* cold cache lines at recvmsg time.
* skb->len can be stored on 16 bits since the udp header has been already
* validated and pulled.
*/
struct udp_dev_scratch {
u32 truesize;
u16 len;
bool is_linear;
bool csum_unnecessary;
};
static inline unsigned int udp_skb_len(struct sk_buff *skb)
{
return ((struct udp_dev_scratch *)&skb->dev_scratch)->len;
}
static inline bool udp_skb_csum_unnecessary(struct sk_buff *skb)
{
return ((struct udp_dev_scratch *)&skb->dev_scratch)->csum_unnecessary;
}
static inline bool udp_skb_is_linear(struct sk_buff *skb)
{
return ((struct udp_dev_scratch *)&skb->dev_scratch)->is_linear;
}
#else
static inline unsigned int udp_skb_len(struct sk_buff *skb)
{
return skb->len;
}
static inline bool udp_skb_csum_unnecessary(struct sk_buff *skb)
{
return skb_csum_unnecessary(skb);
}
static inline bool udp_skb_is_linear(struct sk_buff *skb)
{
return !skb_is_nonlinear(skb);
}
#endif
static inline int copy_linear_skb(struct sk_buff *skb, int len, int off,
struct iov_iter *to)
{
int n, copy = len - off;
n = copy_to_iter(skb->data + off, copy, to);
if (n == copy)
return 0;
return -EFAULT;
}
/*
* SNMP statistics for UDP and UDP-Lite
*/