Name

skb_zerocopy — Zero copy skb to skb

Synopsis

int skb_zerocopy (struct sk_buff * to,
 struct sk_buff * from,
 int len,
 int hlen);
 

Arguments

struct sk_buff * to

destination buffer

struct sk_buff * from

source buffer

int len

number of bytes to copy from source buffer

int hlen

size of linear headroom in destination buffer

Description

Copies up to `len` bytes from `from` to `to` by creating references to the frags in the source buffer.

The `hlen` as calculated by skb_zerocopy_headlen specifies the headroom in the `to` buffer.

Return value: 0: everything is OK -ENOMEM: couldn't orphan frags of from due to lack of memory -EFAULT: skb_copy_bits found some problem with skb geometry