SKB_ZEROCOPY(9)                          Linux Networking                         SKB_ZEROCOPY(9)



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.

       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

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                           SKB_ZEROCOPY(9)