BUILD_SKB(9) Linux Networking BUILD_SKB(9)
NAME
build_skb - build a network buffer
SYNOPSIS
struct sk_buff * build_skb(void * data, unsigned int frag_size);
ARGUMENTS
data
data buffer provided by caller
frag_size
size of fragment, or 0 if head was kmalloced
DESCRIPTION
Allocate a new sk_buff. Caller provides space holding head and skb_shared_info. data must have been allocated by kmalloc The return is the
new skb buffer. On a failure the return is NULL, and data is not freed.
NOTES
Before IO, driver allocates only data buffer where NIC put incoming frame Driver should add room at head (NET_SKB_PAD) and MUST add room at
tail (SKB_DATA_ALIGN(skb_shared_info)) After IO, driver calls build_skb, to allocate sk_buff and populate it before giving packet to stack.
RX rings only contains data buffers, not full skbs.
COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 BUILD_SKB(9)
