skb_zerocopy (9) Linux Manual Page
skb_zerocopy – Zero copy skb to skb
Synopsis
int skb_zerocopy(struct sk_buff *to, struct sk_buff *from, int len, int hlen);Arguments
to
-
- destination buffer
from
- source buffer
len
- number of bytes to copy from source buffer
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