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

[Wei Liu <wei.liu2@xxxxxxxxxx>]

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@xxxxxxxxxx>
Signed-off-by: Anirban Chakraborty <abchak@xxxxxxxxxxx>
Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 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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