netdev - [PATCH net-next] xen-netfront: convert to GRO API and advertise this feature

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Date:	Sat, 21 Sep 2013 17:05:43 +0100
From:	Wei Liu <wei.liu2@...rix.com>
To:	<netdev@...r.kernel.org>
CC:	<xen-devel@...ts.xen.org>, Wei Liu <wei.liu2@...rix.com>,
	Anirban Chakraborty <abchak@...iper.net>,
	Ian Campbell <ian.campbell@...rix.com>
Subject: [PATCH net-next] xen-netfront: convert to GRO API and advertise this feature

Anirban was seeing netfront received MTU size packets, which downgraded
throughput. The following patch makes netfront use GRO API which
improves throughput for that case.

Signed-off-by: Wei Liu <wei.liu2@...rix.com>
Signed-off-by: Anirban Chakraborty <abchak@...iper.net>
Cc: Ian Campbell <ian.campbell@...rix.com>
---
 drivers/net/xen-netfront.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index 36808bf..5664165 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -952,7 +952,7 @@ static int handle_incoming_queue(struct net_device *dev,
 		u64_stats_update_end(&stats->syncp);
 
 		/* Pass it up. */
-		netif_receive_skb(skb);
+		napi_gro_receive(&np->napi, skb);
 	}
 
 	return packets_dropped;
@@ -1051,6 +1051,8 @@ err:
 	if (work_done < budget) {
 		int more_to_do = 0;
 
+		napi_gro_flush(napi, false);
+
 		local_irq_save(flags);
 
 		RING_FINAL_CHECK_FOR_RESPONSES(&np->rx, more_to_do);
@@ -1371,7 +1373,8 @@ static struct net_device *xennet_create_dev(struct xenbus_device *dev)
 	netif_napi_add(netdev, &np->napi, xennet_poll, 64);
 	netdev->features        = NETIF_F_IP_CSUM | NETIF_F_RXCSUM |
 				  NETIF_F_GSO_ROBUST;
-	netdev->hw_features	= NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_TSO;
+	netdev->hw_features	= NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_TSO |
+				  NETIF_F_GRO;
 
 	/*
          * Assume that all hw features are available for now. This set
-- 
1.7.10.4

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