Commit d13612b5 authored by Alexander Lobakin's avatar Alexander Lobakin Committed by David S. Miller
Browse files

skbuff: allow to optionally use NAPI cache from __alloc_skb() 



Reuse the old and forgotten SKB_ALLOC_NAPI to add an option to get
an skbuff_head from the NAPI cache instead of inplace allocation
inside __alloc_skb().
This implies that the function is called from softirq or BH-off
context, not for allocating a clone or from a distant node.

Cc: Alexander Duyck <alexander.duyck@gmail.com> # Simplified flags check
Signed-off-by: default avatarAlexander Lobakin <alobakin@pm.me>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f450d539

net/core/skbuff.c

+5 −1
Original line number Diff line number Diff line
@@ -405,7 +405,11 @@ struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask, 
		gfp_mask |= __GFP_MEMALLOC;



	/* Get the HEAD */

	skb = kmem_cache_alloc_node(cache, gfp_mask & ~__GFP_DMA, node);

	if ((flags & (SKB_ALLOC_FCLONE | SKB_ALLOC_NAPI)) == SKB_ALLOC_NAPI &&

	    likely(node == NUMA_NO_NODE || node == numa_mem_id()))

		skb = napi_skb_cache_get();

	else

		skb = kmem_cache_alloc_node(cache, gfp_mask & ~GFP_DMA, node);

	if (unlikely(!skb))

		return NULL;

	prefetchw(skb);