suse man page for dev_alloc_skb

DEV_ALLOC_SKB(9)						 Linux Networking						  DEV_ALLOC_SKB(9)

NAME
       dev_alloc_skb - allocate an skbuff for receiving

SYNOPSIS
       struct sk_buff * dev_alloc_skb(unsigned int length);

ARGUMENTS
       length
	   length to allocate

DESCRIPTION
       Allocate a new sk_buff and assign it a usage count of one. The buffer has unspecified headroom built in. Users should allocate the headroom
       they think they need without accounting for the built in space. The built in space is used for optimisations.

       NULL is returned if there is no free memory. Although this function allocates memory it can be called from an interrupt.

COPYRIGHT
Kernel Hackers Manual 2.6.					     July 2010							  DEV_ALLOC_SKB(9)