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: Alexander Lobakin <alobakin@pm.me> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -405,7 +405,11 @@ struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask,
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gfp_mask |= __GFP_MEMALLOC;
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/* Get the HEAD */
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skb = kmem_cache_alloc_node(cache, gfp_mask & ~__GFP_DMA, node);
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if ((flags & (SKB_ALLOC_FCLONE | SKB_ALLOC_NAPI)) == SKB_ALLOC_NAPI &&
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likely(node == NUMA_NO_NODE || node == numa_mem_id()))
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skb = napi_skb_cache_get();
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else
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skb = kmem_cache_alloc_node(cache, gfp_mask & ~GFP_DMA, node);
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if (unlikely(!skb))
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return NULL;
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prefetchw(skb);
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