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From: Paolo Abeni <pabeni@redhat.com>
To: netdev@vger.kernel.org
Cc: "David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Eric Dumazet <edumazet@google.com>
Subject: [PATCH net-next 1/6] sk_buff: introduce 'slow_gro' flags
Date: Wed, 28 Jul 2021 18:23:59 +0200	[thread overview]
Message-ID: <075a3b28299ad4a0b00c28ff5886b9b4fe475392.1627405778.git.pabeni@redhat.com> (raw)
In-Reply-To: <cover.1627405778.git.pabeni@redhat.com>

The new flag tracks if any state field is set, so that
GRO requires 'unusual'/slow prepare steps.

Set such flag when a ct entry is attached to the skb,
and never clear it.

The new bit uses an existing hole into the sk_buff struct

RFC -> v1:
 - use a single state bit, never clear it
 - avoid moving the _nfct field

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---
 include/linux/skbuff.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index f19190820e63..3ff18300d210 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -689,6 +689,7 @@ typedef unsigned char *sk_buff_data_t;
  *		CHECKSUM_UNNECESSARY (max 3)
  *	@dst_pending_confirm: need to confirm neighbour
  *	@decrypted: Decrypted SKB
+ *	@slow_gro: state present at GRO time, slower prepare step required
  *	@napi_id: id of the NAPI struct this skb came from
  *	@sender_cpu: (aka @napi_id) source CPU in XPS
  *	@secmark: security marking
@@ -870,6 +871,7 @@ struct sk_buff {
 #ifdef CONFIG_TLS_DEVICE
 	__u8			decrypted:1;
 #endif
+	__u8			slow_gro:1;
 
 #ifdef CONFIG_NET_SCHED
 	__u16			tc_index;	/* traffic control index */
@@ -4216,6 +4218,7 @@ static inline unsigned long skb_get_nfct(const struct sk_buff *skb)
 static inline void skb_set_nfct(struct sk_buff *skb, unsigned long nfct)
 {
 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
+	skb->slow_gro |= !!nfct;
 	skb->_nfct = nfct;
 #endif
 }
@@ -4375,6 +4378,7 @@ static inline void nf_copy(struct sk_buff *dst, const struct sk_buff *src)
 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
 	nf_conntrack_put(skb_nfct(dst));
 #endif
+	dst->slow_gro = src->slow_gro;
 	__nf_copy(dst, src, true);
 }
 
-- 
2.26.3


  reply	other threads:[~2021-07-28 16:24 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-28 16:23 [PATCH net-next 0/6] sk_buff: optimize GRO for the common case Paolo Abeni
2021-07-28 16:23 ` Paolo Abeni [this message]
2021-07-28 16:24 ` [PATCH net-next 2/6] sk_buff: track dst status in slow_gro Paolo Abeni
2021-07-30 11:08   ` Jakub Kicinski
2021-07-30 13:08     ` Paolo Abeni
2021-07-28 16:24 ` [PATCH net-next 3/6] sk_buff: track extension " Paolo Abeni
2021-07-28 16:24 ` [PATCH net-next 4/6] net: optimize GRO for the common case Paolo Abeni
2021-07-28 16:24 ` [PATCH net-next 5/6] skbuff: allow 'slow_gro' for skb carring sock reference Paolo Abeni
2021-07-28 16:24 ` [PATCH net-next 6/6] veth: use skb_prepare_for_gro() Paolo Abeni
2021-07-29 11:20 ` [PATCH net-next 0/6] sk_buff: optimize GRO for the common case patchwork-bot+netdevbpf

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