centos man page for netdev_alloc_skb

NETDEV_ALLOC_SKB(9)						 Linux Networking					       NETDEV_ALLOC_SKB(9)

NAME
       netdev_alloc_skb - allocate an skbuff for rx on a specific device

SYNOPSIS
       struct sk_buff * netdev_alloc_skb(struct net_device * dev, unsigned int length);

ARGUMENTS
       dev
	   network device to receive on

       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 3.10					     June 2014						       NETDEV_ALLOC_SKB(9)