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| 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¶
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
COPYRIGHT¶
| September 2017 | Kernel Hackers Manual 4.12 |