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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

July 2017 Kernel Hackers Manual 4.12