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Date:	Thu, 02 Feb 2012 15:44:25 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Or Gerlitz <ogerlitz@...lanox.com>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	Roland Dreier <roland@...nel.org>, netdev@...r.kernel.org,
	linux-rdma <linux-rdma@...r.kernel.org>,
	Shlomo Pongratz <shlomop@...lanox.com>
Subject: Re: [PATCH 2/2] IB/ipoib: fix GRO merge failure for IPoIB
 originated TCP streams

Le jeudi 02 février 2012 à 15:38 +0100, Eric Dumazet a écrit :

> I guess changing hard_header_len might be difficult (for you).
> 
> Adding gro_mac_header_len sounds the easy way.
> 
> [ You'll need to set it in your device setup() ]
> 

Something like :

 include/linux/netdevice.h |    2 +-
 net/core/dev.c            |   11 +++++++++--
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 0eac07c..99b12c4 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1095,7 +1095,7 @@ struct net_device {
 	unsigned int		mtu;	/* interface MTU value		*/
 	unsigned short		type;	/* interface hardware type	*/
 	unsigned short		hard_header_len;	/* hardware hdr length	*/
-
+	unsigned int		gro_mac_header_len;
 	/* extra head- and tailroom the hardware may need, but not in all cases
 	 * can this be guaranteed, especially tailroom. Some cases also use
 	 * LL_MAX_HEADER instead to allocate the skb.
diff --git a/net/core/dev.c b/net/core/dev.c
index f124947..a3af7bc 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3491,14 +3491,20 @@ static inline gro_result_t
 __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
 {
 	struct sk_buff *p;
+	unsigned int maclen = skb->dev->gro_mac_header_len;
 
 	for (p = napi->gro_list; p; p = p->next) {
 		unsigned long diffs;
 
 		diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
 		diffs |= p->vlan_tci ^ skb->vlan_tci;
-		diffs |= compare_ether_header(skb_mac_header(p),
-					      skb_gro_mac_header(skb));
+		if (maclen == ETH_HLEN)
+			diffs |= compare_ether_header(skb_mac_header(p),
+						      skb_gro_mac_header(skb));
+		else if (!diffs)
+			diffs = memcmp(skb_mac_header(p),
+					skb_gro_mac_header(skb),
+					maclen);
 		NAPI_GRO_CB(p)->same_flow = !diffs;
 		NAPI_GRO_CB(p)->flush = 0;
 	}
@@ -5962,6 +5968,7 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
 	INIT_LIST_HEAD(&dev->unreg_list);
 	INIT_LIST_HEAD(&dev->link_watch_list);
 	dev->priv_flags = IFF_XMIT_DST_RELEASE;
+	dev->gro_mac_header_len = ETH_HLEN;
 	setup(dev);
 
 	dev->num_tx_queues = txqs;


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