netdev - [patch net-next RFC v2 2/6] skbuff: add "missed

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Date:	Wed, 26 Mar 2014 17:31:08 +0100
From:	Jiri Pirko <jiri@...nulli.us>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, nhorman@...driver.com, andy@...yhouse.net,
	tgraf@...g.ch, dborkman@...hat.com, ogerlitz@...lanox.com,
	jesse@...ira.com, pshelar@...ira.com, azhou@...ira.com,
	ben@...adent.org.uk, stephen@...workplumber.org,
	jeffrey.t.kirsher@...el.com, vyasevic@...hat.com,
	xiyou.wangcong@...il.com, john.r.fastabend@...el.com,
	edumazet@...gle.com, jhs@...atatu.com, sfeldma@...ulusnetworks.com,
	f.fainelli@...il.com, roopa@...ulusnetworks.com,
	linville@...driver.com, dev@...nvswitch.org
Subject: [patch net-next RFC v2 2/6] skbuff: add "missed_flow" flag

This flag sets incoming switch device in order to let know that the flow
which the skb is part of is missed. Listener may react to it
appropriately,

Signed-off-by: Jiri Pirko <jiri@...nulli.us>
---
 include/linux/filter.h |  1 +
 include/linux/skbuff.h | 13 +++++++++++++
 net/core/filter.c      |  3 +++
 3 files changed, 17 insertions(+)

diff --git a/include/linux/filter.h b/include/linux/filter.h
index e568c8e..38c7c04 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -154,6 +154,7 @@ enum {
 	BPF_S_ANC_VLAN_TAG,
 	BPF_S_ANC_VLAN_TAG_PRESENT,
 	BPF_S_ANC_PAY_OFFSET,
+	BPF_S_ANC_MISSED_FLOW,
 };
 
 #endif /* __LINUX_FILTER_H__ */
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 03db95a..0100c2f 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -567,6 +567,7 @@ struct sk_buff {
 	 * headers if needed
 	 */
 	__u8			encapsulation:1;
+	__u8			missed_flow:1;
 	/* 6/8 bit hole (depending on ndisc_nodetype presence) */
 	kmemcheck_bitfield_end(flags2);
 
@@ -2993,5 +2994,17 @@ static inline unsigned int skb_gso_network_seglen(const struct sk_buff *skb)
 			       skb_network_header(skb);
 	return hdr_len + skb_gso_transport_seglen(skb);
 }
+
+/**
+ * skb_mark_missed_flow - marks skb as a part of missed flow
+ * @skb: buffer
+ *
+ * Marks skb as a part of missed flow.
+ */
+static inline void skb_mark_missed_flow(struct sk_buff *skb)
+{
+	skb->missed_flow = 1;
+}
+
 #endif	/* __KERNEL__ */
 #endif	/* _LINUX_SKBUFF_H */
diff --git a/net/core/filter.c b/net/core/filter.c
index ad30d62..048f11a 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -350,6 +350,9 @@ load_b:
 		case BPF_S_ANC_PAY_OFFSET:
 			A = __skb_get_poff(skb);
 			continue;
+		case BPF_S_ANC_MISSED_FLOW:
+			A = !!skb->missed_flow;
+			continue;
 		case BPF_S_ANC_NLATTR: {
 			struct nlattr *nla;
 
-- 
1.8.5.3

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