xen-netfront: convert to GRO API

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@citrix.com>
Cc: Anirban Chakraborty <abchak@juniper.net>
Cc: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Konrad Wilk <konrad.wilk@oracle.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index 36808bf..dd1011e 100644 (file)
--- 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);