centos man page for __alloc_skb

__ALLOC_SKB(9)							 Linux Networking						    __ALLOC_SKB(9)

NAME
       __alloc_skb - allocate a network buffer

SYNOPSIS
       struct sk_buff * __alloc_skb(unsigned int size, gfp_t gfp_mask, int flags, int node);

ARGUMENTS
       size
	   size to allocate

       gfp_mask
	   allocation mask

       flags
	   If SKB_ALLOC_FCLONE is set, allocate from fclone cache instead of head cache and allocate a cloned (child) skb. If SKB_ALLOC_RX is set,
	   __GFP_MEMALLOC will be used for allocations in case the data is required for writeback

       node
	   numa node to allocate memory on

DESCRIPTION
       Allocate a new sk_buff. The returned buffer has no headroom and a tail room of at least size bytes. The object has a reference count of
       one. The return is the buffer. On a failure the return is NULL.

       Buffers may only be allocated from interrupts using a gfp_mask of GFP_ATOMIC.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							    __ALLOC_SKB(9)