1SKB_ZEROCOPY(9)                Linux Networking                SKB_ZEROCOPY(9)
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NAME

6       skb_zerocopy - Zero copy skb to skb
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SYNOPSIS

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

13       to
14           destination buffer
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16       from
17           -- undescribed --
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19       len
20           number of bytes to copy from source buffer
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22       hlen
23           size of linear headroom in destination buffer
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DESCRIPTION

26       Copies up to `len` bytes from `from` to `to` by creating references to
27       the frags in the source buffer.
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29       The `hlen` as calculated by skb_zerocopy_headlen specifies the headroom
30       in the `to` buffer.
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0

33       everything is OK -ENOMEM: couldn't orphan frags of from due to lack of
34       memory -EFAULT: skb_copy_bits found some problem with skb geometry
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37Kernel Hackers Manual 3.10         June 2019                   SKB_ZEROCOPY(9)
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