netdev - Re: [PATCH net-next] net-gro: restore frag0 optimization

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Message-ID: <1396299703.29410.71.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Mon, 31 Mar 2014 14:01:43 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	mschmidt@...hat.com, netdev@...r.kernel.org, edumazet@...gle.com,
	hkchu@...gle.com
Subject: Re: [PATCH net-next] net-gro: restore frag0 optimization

On Mon, 2014-03-31 at 16:27 -0400, David Miller wrote:

> Ok, applied, thanks for taking care of this Eric.
> 
> We can send to -stable after it's gotten a lot of testing and
> auditing.

Thanks David

BTW, I found a off-by-one error in skb_gro_header_hard()

TCP pure ACK packets always hit the 'slow' path, if I understand this
correctly.

I'll formally submit the following when I have tested it.


diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 775cc956ff78..7484d6f3d6cb 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1998,9 +1998,10 @@ static inline void *skb_gro_header_fast(struct sk_buff *skb,
 	return NAPI_GRO_CB(skb)->frag0 + offset;
 }
 
-static inline int skb_gro_header_hard(struct sk_buff *skb, unsigned int hlen)
+static inline bool skb_gro_header_hard(const struct sk_buff *skb,
+				       unsigned int hlen)
 {
-	return NAPI_GRO_CB(skb)->frag0_len < hlen;
+	return NAPI_GRO_CB(skb)->frag0_len <= hlen;
 }
 
 static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,


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