From: Alexander Lobakin <alobakin@pm.me>
To: "David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>
Cc: "Jonathan Lemon" <jonathan.lemon@gmail.com>,
"Eric Dumazet" <edumazet@google.com>,
"Dmitry Vyukov" <dvyukov@google.com>,
"Willem de Bruijn" <willemb@google.com>,
"Alexander Lobakin" <alobakin@pm.me>,
"Randy Dunlap" <rdunlap@infradead.org>,
"Kevin Hao" <haokexin@gmail.com>,
"Pablo Neira Ayuso" <pablo@netfilter.org>,
"Jakub Sitnicki" <jakub@cloudflare.com>,
"Marco Elver" <elver@google.com>,
"Dexuan Cui" <decui@microsoft.com>,
"Paolo Abeni" <pabeni@redhat.com>,
"Jesper Dangaard Brouer" <brouer@redhat.com>,
"Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Andrii Nakryiko" <andriin@fb.com>,
"Taehee Yoo" <ap420073@gmail.com>,
"Cong Wang" <xiyou.wangcong@gmail.com>,
"Björn Töpel" <bjorn@kernel.org>,
"Miaohe Lin" <linmiaohe@huawei.com>,
"Guillaume Nault" <gnault@redhat.com>,
"Yonghong Song" <yhs@fb.com>, zhudi <zhudi21@huawei.com>,
"Michal Kubecek" <mkubecek@suse.cz>,
"Marcelo Ricardo Leitner" <marcelo.leitner@gmail.com>,
"Dmitry Safonov" <0x7f454c46@gmail.com>,
"Yang Yingliang" <yangyingliang@huawei.com>,
"Florian Westphal" <fw@strlen.de>,
"Edward Cree" <ecree.xilinx@gmail.com>,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Subject: [PATCH v4 net-next 09/11] skbuff: allow to optionally use NAPI cache from __alloc_skb()
Date: Wed, 10 Feb 2021 16:30:43 +0000 [thread overview]
Message-ID: <20210210162732.80467-10-alobakin@pm.me> (raw)
In-Reply-To: <20210210162732.80467-1-alobakin@pm.me>
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.
Signed-off-by: Alexander Lobakin <alobakin@pm.me>
---
net/core/skbuff.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 9e1a8ded4acc..750fa1825b28 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -397,15 +397,20 @@ struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask,
struct sk_buff *skb;
u8 *data;
bool pfmemalloc;
+ bool clone;
- cache = (flags & SKB_ALLOC_FCLONE)
- ? skbuff_fclone_cache : skbuff_head_cache;
+ clone = !!(flags & SKB_ALLOC_FCLONE);
+ cache = clone ? skbuff_fclone_cache : skbuff_head_cache;
if (sk_memalloc_socks() && (flags & SKB_ALLOC_RX))
gfp_mask |= __GFP_MEMALLOC;
/* Get the HEAD */
- skb = kmem_cache_alloc_node(cache, gfp_mask & ~__GFP_DMA, node);
+ if (!clone && (flags & 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);
@@ -436,7 +441,7 @@ struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask,
__build_skb_around(skb, data, 0);
skb->pfmemalloc = pfmemalloc;
- if (flags & SKB_ALLOC_FCLONE) {
+ if (clone) {
struct sk_buff_fclones *fclones;
fclones = container_of(skb, struct sk_buff_fclones, skb1);
--
2.30.1
next prev parent reply other threads:[~2021-02-10 16:36 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-10 16:28 [PATCH v4 net-next 00/11] skbuff: introduce skbuff_heads bulking and reusing Alexander Lobakin
2021-02-10 16:28 ` [PATCH v4 net-next 01/11] skbuff: move __alloc_skb() next to the other skb allocation functions Alexander Lobakin
2021-02-10 16:28 ` [PATCH v4 net-next 02/11] skbuff: simplify kmalloc_reserve() Alexander Lobakin
2021-02-10 16:29 ` [PATCH v4 net-next 03/11] skbuff: make __build_skb_around() return void Alexander Lobakin
2021-02-10 16:29 ` [PATCH v4 net-next 04/11] skbuff: simplify __alloc_skb() a bit Alexander Lobakin
2021-02-10 16:29 ` [PATCH v4 net-next 05/11] skbuff: use __build_skb_around() in __alloc_skb() Alexander Lobakin
2021-02-10 16:29 ` [PATCH v4 net-next 06/11] skbuff: remove __kfree_skb_flush() Alexander Lobakin
2021-02-10 16:30 ` [PATCH v4 net-next 07/11] skbuff: move NAPI cache declarations upper in the file Alexander Lobakin
2021-02-10 16:30 ` [PATCH v4 net-next 08/11] skbuff: introduce {,__}napi_build_skb() which reuses NAPI cache heads Alexander Lobakin
2021-02-11 12:54 ` Jesper Dangaard Brouer
2021-02-11 14:38 ` Alexander Lobakin
2021-02-10 16:30 ` Alexander Lobakin [this message]
2021-02-11 10:16 ` [PATCH v4 net-next 09/11] skbuff: allow to optionally use NAPI cache from __alloc_skb() Paolo Abeni
2021-02-11 14:28 ` Alexander Lobakin
2021-02-11 14:55 ` Paolo Abeni
2021-02-11 15:26 ` Alexander Lobakin
2021-02-10 16:30 ` [PATCH v4 net-next 10/11] skbuff: allow to use NAPI cache from __napi_alloc_skb() Alexander Lobakin
2021-02-10 16:31 ` [PATCH v4 net-next 11/11] skbuff: queue NAPI_MERGED_FREE skbs into NAPI cache instead of freeing Alexander Lobakin
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