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Subject[v3 net-next 10/10] skbuff: queue NAPI_MERGED_FREE skbs into NAPI cache instead of freeing
napi_frags_finish() and napi_skb_finish() can only be called inside
NAPI Rx context, so we can feed NAPI cache with skbuff_heads that
got NAPI_MERGED_FREE verdict instead of immediate freeing.
Replace __kfree_skb() with __kfree_skb_defer() in napi_skb_finish()
and move napi_skb_free_stolen_head() to skbuff.c, so it can drop skbs
to NAPI cache.
As many drivers call napi_alloc_skb()/napi_get_frags() on their
receive path, this becomes especially useful.

Signed-off-by: Alexander Lobakin <alobakin@pm.me>
---
include/linux/skbuff.h | 1 +
net/core/dev.c | 9 +--------
net/core/skbuff.c | 12 +++++++++---
3 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 5bb443d37bf4..f8737ad91cc7 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2919,6 +2919,7 @@ static inline struct sk_buff *napi_alloc_skb(struct napi_struct *napi,
}
void napi_consume_skb(struct sk_buff *skb, int budget);

+void napi_skb_free_stolen_head(struct sk_buff *skb);
void __kfree_skb_defer(struct sk_buff *skb);

/**
diff --git a/net/core/dev.c b/net/core/dev.c
index 135d46c0c3c7..68ad03382f6a 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6056,13 +6056,6 @@ struct packet_offload *gro_find_complete_by_type(__be16 type)
}
EXPORT_SYMBOL(gro_find_complete_by_type);

-static void napi_skb_free_stolen_head(struct sk_buff *skb)
-{
- skb_dst_drop(skb);
- skb_ext_put(skb);
- kmem_cache_free(skbuff_head_cache, skb);
-}
-
static gro_result_t napi_skb_finish(struct napi_struct *napi,
struct sk_buff *skb,
gro_result_t ret)
@@ -6076,7 +6069,7 @@ static gro_result_t napi_skb_finish(struct napi_struct *napi,
if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD)
napi_skb_free_stolen_head(skb);
else
- __kfree_skb(skb);
+ __kfree_skb_defer(skb);
break;

case GRO_HELD:
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 8850086f8605..6dbc486c1d68 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -872,9 +872,6 @@ static void napi_skb_cache_put(struct sk_buff *skb)
struct napi_alloc_cache *nc = this_cpu_ptr(&napi_alloc_cache);
u32 i;

- /* drop skb->head and call any destructors for packet */
- skb_release_all(skb);
-
kasan_poison_object_data(skbuff_head_cache, skb);
nc->skb_cache[nc->skb_count++] = skb;

@@ -891,6 +888,14 @@ static void napi_skb_cache_put(struct sk_buff *skb)

void __kfree_skb_defer(struct sk_buff *skb)
{
+ skb_release_all(skb);
+ napi_skb_cache_put(skb);
+}
+
+void napi_skb_free_stolen_head(struct sk_buff *skb)
+{
+ skb_dst_drop(skb);
+ skb_ext_put(skb);
napi_skb_cache_put(skb);
}

@@ -916,6 +921,7 @@ void napi_consume_skb(struct sk_buff *skb, int budget)
return;
}

+ skb_release_all(skb);
napi_skb_cache_put(skb);
}
EXPORT_SYMBOL(napi_consume_skb);
--
2.30.0

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