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
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.
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