drivers: net: generalize napi_complete_done()

napi_complete_done() allows to opt-in for gro_flush_timeout,
added back in linux-3.19, commit 3b47d30396ba
("net: gro: add a per device gro flush timer")

This allows for more efficient GRO aggregation without
sacrifying latencies.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/ti/davinci_emac.c b/drivers/net/ethernet/ti/davinci_emac.c
index 481c7bf..64d5527 100644
--- a/drivers/net/ethernet/ti/davinci_emac.c
+++ b/drivers/net/ethernet/ti/davinci_emac.c
@@ -1295,7 +1295,7 @@ static int emac_poll(struct napi_struct *napi, int budget)
 					&emac_rxhost_errcodes[cause][0], ch);
 		}
 	} else if (num_rx_pkts < budget) {
-		napi_complete(napi);
+		napi_complete_done(napi, num_rx_pkts);
 		emac_int_enable(priv);
 	}