BUILD_SKB(9) Linux Networking BUILD_SKB(9)
NAME build_skb - build a network buffer
SYNOPSIS struct sk_buff * build_skb(void * data);
ARGUMENTS data data buffer provided by caller
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 2.6. July 2015 BUILD_SKB(9)