netdev - [PATCH net-next 1/6] net: Add skb_get_hash

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Message-Id: <1425494404-24114-2-git-send-email-therbert@google.com>
Date:	Wed,  4 Mar 2015 10:39:59 -0800
From:	Tom Herbert <therbert@...gle.com>
To:	davem@...emloft.net, netdev@...r.kernel.org,
	eric.dumazet@...il.com, fw@...len.de
Subject: [PATCH net-next 1/6] net: Add skb_get_hash_perturb

This is used to get the skb->hash and then perturb it for a local use.

Signed-off-by: Tom Herbert <therbert@...gle.com>
---
 include/linux/skbuff.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index bba1330..10572b6 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -17,6 +17,7 @@
 #include <linux/kernel.h>
 #include <linux/kmemcheck.h>
 #include <linux/compiler.h>
+#include <linux/jhash.h>
 #include <linux/time.h>
 #include <linux/bug.h>
 #include <linux/cache.h>
@@ -920,6 +921,20 @@ static inline __u32 skb_get_hash(struct sk_buff *skb)
 	return skb->hash;
 }
 
+static inline __u32 skb_get_hash_perturb(struct sk_buff *skb,
+					 u32 perturb)
+{
+	u32 hash = skb_get_hash(skb);
+
+	if (likely(hash)) {
+		hash = jhash_1word((__force __u32) hash, perturb);
+		if (unlikely(!hash))
+			hash = 1;
+	}
+
+	return hash;
+}
+
 static inline __u32 skb_get_hash_raw(const struct sk_buff *skb)
 {
 	return skb->hash;
-- 
2.2.0.rc0.207.ga3a616c

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