[PATCH v6 net-next 09/11] skbuff: allow to optionally use NAPI cache from __alloc_skb()
From: Alexander Lobakin <hidden>
Date: 2021-02-13 14:16:18
Also in:
lkml
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
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 <redacted> # Simplified flags check Signed-off-by: Alexander Lobakin <redacted> --- net/core/skbuff.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 9e1a8ded4acc..a80581eed7fc 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c@@ -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);
--
2.30.1